1 /*
2 * Copyright (c) 1998, 2023, 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 "cds/cdsConfig.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaClasses.hpp"
30 #include "classfile/stackMapTable.hpp"
31 #include "classfile/stackMapFrame.hpp"
32 #include "classfile/stackMapTableFormat.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "classfile/systemDictionary.hpp"
35 #include "classfile/verifier.hpp"
36 #include "classfile/vmClasses.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "interpreter/bytecodes.hpp"
39 #include "interpreter/bytecodeStream.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.hpp"
46 #include "oops/constantPool.inline.hpp"
47 #include "oops/instanceKlass.inline.hpp"
48 #include "oops/klass.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/typeArrayOop.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/fieldDescriptor.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/interfaceSupport.inline.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/javaThread.hpp"
57 #include "runtime/jniHandles.inline.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "services/threadService.hpp"
61 #include "utilities/align.hpp"
62 #include "utilities/bytes.hpp"
63
64 #define NOFAILOVER_MAJOR_VERSION 51
65 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
66 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
67 #define INLINE_TYPE_MAJOR_VERSION 56
68 #define MAX_ARRAY_DIMENSIONS 255
69
70 // Access to external entry for VerifyClassForMajorVersion - old byte code verifier
71
72 extern "C" {
73 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint, jint);
74 }
75
76 static verify_byte_codes_fn_t volatile _verify_byte_codes_fn = nullptr;
77
78 static verify_byte_codes_fn_t verify_byte_codes_fn() {
79
80 if (_verify_byte_codes_fn != nullptr)
81 return _verify_byte_codes_fn;
82
83 MutexLocker locker(Verify_lock);
84
85 if (_verify_byte_codes_fn != nullptr)
86 return _verify_byte_codes_fn;
87
88 // Load verify dll
89 char buffer[JVM_MAXPATHLEN];
90 char ebuf[1024];
91 if (!os::dll_locate_lib(buffer, sizeof(buffer), Arguments::get_dll_dir(), "verify"))
92 return nullptr; // Caller will throw VerifyError
93
94 void *lib_handle = os::dll_load(buffer, ebuf, sizeof(ebuf));
95 if (lib_handle == nullptr)
96 return nullptr; // Caller will throw VerifyError
97
98 void *fn = os::dll_lookup(lib_handle, "VerifyClassForMajorVersion");
99 if (fn == nullptr)
100 return nullptr; // Caller will throw VerifyError
101
102 return _verify_byte_codes_fn = CAST_TO_FN_PTR(verify_byte_codes_fn_t, fn);
103 }
104
105
106 // Methods in Verifier
107
108 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
109 return (class_loader == nullptr || !should_verify_class) ?
110 BytecodeVerificationLocal : BytecodeVerificationRemote;
111 }
112
113 bool Verifier::relax_access_for(oop loader) {
114 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
115 bool need_verify =
116 // verifyAll
117 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
118 // verifyRemote
119 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
120 return !need_verify;
121 }
122
123 void Verifier::trace_class_resolution(Klass* resolve_class, InstanceKlass* verify_class) {
124 assert(verify_class != nullptr, "Unexpected null verify_class");
125 ResourceMark rm;
126 Symbol* s = verify_class->source_file_name();
127 const char* source_file = (s != nullptr ? s->as_C_string() : nullptr);
128 const char* verify = verify_class->external_name();
129 const char* resolve = resolve_class->external_name();
130 // print in a single call to reduce interleaving between threads
131 if (source_file != nullptr) {
132 log_debug(class, resolve)("%s %s %s (verification)", verify, resolve, source_file);
133 } else {
134 log_debug(class, resolve)("%s %s (verification)", verify, resolve);
135 }
136 }
137
138 // Prints the end-verification message to the appropriate output.
139 void Verifier::log_end_verification(outputStream* st, const char* klassName, Symbol* exception_name, oop pending_exception) {
140 if (pending_exception != nullptr) {
141 st->print("Verification for %s has", klassName);
142 oop message = java_lang_Throwable::message(pending_exception);
143 if (message != nullptr) {
144 char* ex_msg = java_lang_String::as_utf8_string(message);
145 st->print_cr(" exception pending '%s %s'",
146 pending_exception->klass()->external_name(), ex_msg);
147 } else {
148 st->print_cr(" exception pending %s ",
149 pending_exception->klass()->external_name());
150 }
151 } else if (exception_name != nullptr) {
152 st->print_cr("Verification for %s failed", klassName);
153 }
154 st->print_cr("End class verification for: %s", klassName);
155 }
156
157 bool Verifier::verify(InstanceKlass* klass, bool should_verify_class, TRAPS) {
158 HandleMark hm(THREAD);
159 ResourceMark rm(THREAD);
160
161 // Eagerly allocate the identity hash code for a klass. This is a fallout
162 // from 6320749 and 8059924: hash code generator is not supposed to be called
163 // during the safepoint, but it allows to sneak the hashcode in during
164 // verification. Without this eager hashcode generation, we may end up
165 // installing the hashcode during some other operation, which may be at
166 // safepoint -- blowing up the checks. It was previously done as the side
167 // effect (sic!) for external_name(), but instead of doing that, we opt to
168 // explicitly push the hashcode in here. This is signify the following block
169 // is IMPORTANT:
170 if (klass->java_mirror() != nullptr) {
171 klass->java_mirror()->identity_hash();
172 }
173
174 if (!is_eligible_for_verification(klass, should_verify_class)) {
175 return true;
176 }
177
178 // Timer includes any side effects of class verification (resolution,
179 // etc), but not recursive calls to Verifier::verify().
180 JavaThread* jt = THREAD;
181 PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(),
182 ClassLoader::perf_class_verify_selftime(),
183 ClassLoader::perf_classes_verified(),
184 jt->get_thread_stat()->perf_recursion_counts_addr(),
185 jt->get_thread_stat()->perf_timers_addr(),
186 PerfClassTraceTime::CLASS_VERIFY);
187
188 // If the class should be verified, first see if we can use the split
189 // verifier. If not, or if verification fails and can failover, then
190 // call the inference verifier.
191 Symbol* exception_name = nullptr;
192 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
193 char* message_buffer = nullptr;
194 char* exception_message = nullptr;
195
196 log_info(class, init)("Start class verification for: %s", klass->external_name());
197 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
198 ClassVerifier split_verifier(jt, klass);
199 // We don't use CHECK here, or on inference_verify below, so that we can log any exception.
200 split_verifier.verify_class(THREAD);
201 exception_name = split_verifier.result();
202
203 // If dumping static archive then don't fall back to the old verifier on
204 // verification failure. If a class fails verification with the split verifier,
205 // it might fail the CDS runtime verifier constraint check. In that case, we
206 // don't want to share the class. We only archive classes that pass the split
207 // verifier.
208 bool can_failover = !CDSConfig::is_dumping_static_archive() &&
209 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
210
211 if (can_failover && !HAS_PENDING_EXCEPTION && // Split verifier doesn't set PENDING_EXCEPTION for failure
212 (exception_name == vmSymbols::java_lang_VerifyError() ||
213 exception_name == vmSymbols::java_lang_ClassFormatError())) {
214 log_info(verification)("Fail over class verification to old verifier for: %s", klass->external_name());
215 log_info(class, init)("Fail over class verification to old verifier for: %s", klass->external_name());
216 message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
217 exception_message = message_buffer;
218 exception_name = inference_verify(
219 klass, message_buffer, message_buffer_len, THREAD);
220 }
221 if (exception_name != nullptr) {
222 exception_message = split_verifier.exception_message();
223 }
224 } else {
225 message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
226 exception_message = message_buffer;
227 exception_name = inference_verify(
228 klass, message_buffer, message_buffer_len, THREAD);
229 }
230
231 LogTarget(Info, class, init) lt1;
232 if (lt1.is_enabled()) {
233 LogStream ls(lt1);
234 log_end_verification(&ls, klass->external_name(), exception_name, PENDING_EXCEPTION);
235 }
236 LogTarget(Info, verification) lt2;
237 if (lt2.is_enabled()) {
238 LogStream ls(lt2);
239 log_end_verification(&ls, klass->external_name(), exception_name, PENDING_EXCEPTION);
240 }
241
242 if (HAS_PENDING_EXCEPTION) {
243 return false; // use the existing exception
244 } else if (exception_name == nullptr) {
245 return true; // verification succeeded
246 } else { // VerifyError or ClassFormatError to be created and thrown
247 Klass* kls =
248 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
249 if (log_is_enabled(Debug, class, resolve)) {
250 Verifier::trace_class_resolution(kls, klass);
251 }
252
253 while (kls != nullptr) {
254 if (kls == klass) {
255 // If the class being verified is the exception we're creating
256 // or one of it's superclasses, we're in trouble and are going
257 // to infinitely recurse when we try to initialize the exception.
258 // So bail out here by throwing the preallocated VM error.
259 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
260 }
261 kls = kls->super();
262 }
263 if (message_buffer != nullptr) {
264 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
265 }
266 assert(exception_message != nullptr, "");
267 THROW_MSG_(exception_name, exception_message, false);
268 }
269 }
270
271 bool Verifier::is_eligible_for_verification(InstanceKlass* klass, bool should_verify_class) {
272 Symbol* name = klass->name();
273 Klass* refl_serialization_ctor_klass = vmClasses::reflect_SerializationConstructorAccessorImpl_klass();
274
275 bool is_reflect_accessor = refl_serialization_ctor_klass != nullptr &&
276 klass->is_subtype_of(refl_serialization_ctor_klass);
277
278 return (should_verify_for(klass->class_loader(), should_verify_class) &&
279 // return if the class is a bootstrapping class
280 // or defineClass specified not to verify by default (flags override passed arg)
281 // We need to skip the following four for bootstrapping
282 name != vmSymbols::java_lang_Object() &&
283 name != vmSymbols::java_lang_Class() &&
284 name != vmSymbols::java_lang_String() &&
285 name != vmSymbols::java_lang_Throwable() &&
286
287 // Can not verify the bytecodes for shared classes because they have
288 // already been rewritten to contain constant pool cache indices,
289 // which the verifier can't understand.
290 // Shared classes shouldn't have stackmaps either.
291 // However, bytecodes for shared old classes can be verified because
292 // they have not been rewritten.
293 !(klass->is_shared() && klass->is_rewritten()) &&
294
295 // As of the fix for 4486457 we disable verification for all of the
296 // dynamically-generated bytecodes associated with
297 // jdk/internal/reflect/SerializationConstructorAccessor.
298 (!is_reflect_accessor));
299 }
300
301 Symbol* Verifier::inference_verify(
302 InstanceKlass* klass, char* message, size_t message_len, TRAPS) {
303 JavaThread* thread = THREAD;
304
305 verify_byte_codes_fn_t verify_func = verify_byte_codes_fn();
306
307 if (verify_func == nullptr) {
308 jio_snprintf(message, message_len, "Could not link verifier");
309 return vmSymbols::java_lang_VerifyError();
310 }
311
312 ResourceMark rm(thread);
313 log_info(verification)("Verifying class %s with old format", klass->external_name());
314
315 jclass cls = (jclass) JNIHandles::make_local(thread, klass->java_mirror());
316 jint result;
317
318 {
319 HandleMark hm(thread);
320 ThreadToNativeFromVM ttn(thread);
321 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
322 // code knows that we have left the VM
323 JNIEnv *env = thread->jni_environment();
324 result = (*verify_func)(env, cls, message, (int)message_len, klass->major_version());
325 }
326
327 JNIHandles::destroy_local(cls);
328
329 // These numbers are chosen so that VerifyClassCodes interface doesn't need
330 // to be changed (still return jboolean (unsigned char)), and result is
331 // 1 when verification is passed.
332 if (result == 0) {
333 return vmSymbols::java_lang_VerifyError();
334 } else if (result == 1) {
335 return nullptr; // verified.
336 } else if (result == 2) {
337 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, nullptr);
338 } else if (result == 3) {
339 return vmSymbols::java_lang_ClassFormatError();
340 } else {
341 ShouldNotReachHere();
342 return nullptr;
343 }
344 }
345
346 TypeOrigin TypeOrigin::null() {
347 return TypeOrigin();
348 }
349 TypeOrigin TypeOrigin::local(int index, StackMapFrame* frame) {
350 assert(frame != nullptr, "Must have a frame");
351 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
352 frame->local_at(index));
353 }
354 TypeOrigin TypeOrigin::stack(int index, StackMapFrame* frame) {
355 assert(frame != nullptr, "Must have a frame");
356 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
357 frame->stack_at(index));
358 }
359 TypeOrigin TypeOrigin::sm_local(int index, StackMapFrame* frame) {
360 assert(frame != nullptr, "Must have a frame");
361 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
362 frame->local_at(index));
363 }
364 TypeOrigin TypeOrigin::sm_stack(int index, StackMapFrame* frame) {
365 assert(frame != nullptr, "Must have a frame");
366 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
367 frame->stack_at(index));
368 }
369 TypeOrigin TypeOrigin::bad_index(int index) {
370 return TypeOrigin(BAD_INDEX, index, nullptr, VerificationType::bogus_type());
371 }
372 TypeOrigin TypeOrigin::cp(int index, VerificationType vt) {
373 return TypeOrigin(CONST_POOL, index, nullptr, vt);
374 }
375 TypeOrigin TypeOrigin::signature(VerificationType vt) {
376 return TypeOrigin(SIG, 0, nullptr, vt);
377 }
378 TypeOrigin TypeOrigin::implicit(VerificationType t) {
379 return TypeOrigin(IMPLICIT, 0, nullptr, t);
380 }
381 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
382 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
383 VerificationType::bogus_type());
384 }
385
386 void TypeOrigin::reset_frame() {
387 if (_frame != nullptr) {
388 _frame->restore();
389 }
390 }
391
392 void TypeOrigin::details(outputStream* ss) const {
393 _type.print_on(ss);
394 switch (_origin) {
395 case CF_LOCALS:
396 ss->print(" (current frame, locals[%d])", _index);
397 break;
398 case CF_STACK:
399 ss->print(" (current frame, stack[%d])", _index);
400 break;
401 case SM_LOCALS:
402 ss->print(" (stack map, locals[%d])", _index);
403 break;
404 case SM_STACK:
405 ss->print(" (stack map, stack[%d])", _index);
406 break;
407 case CONST_POOL:
408 ss->print(" (constant pool %d)", _index);
409 break;
410 case SIG:
411 ss->print(" (from method signature)");
412 break;
413 case IMPLICIT:
414 case FRAME_ONLY:
415 case NONE:
416 default:
417 ;
418 }
419 }
420
421 #ifdef ASSERT
422 void TypeOrigin::print_on(outputStream* str) const {
423 str->print("{%d,%d,%p:", _origin, _index, _frame);
424 if (_frame != nullptr) {
425 _frame->print_on(str);
426 } else {
427 str->print("null");
428 }
429 str->print(",");
430 _type.print_on(str);
431 str->print("}");
432 }
433 #endif
434
435 void ErrorContext::details(outputStream* ss, const Method* method) const {
436 if (is_valid()) {
437 ss->cr();
438 ss->print_cr("Exception Details:");
439 location_details(ss, method);
440 reason_details(ss);
441 frame_details(ss);
442 bytecode_details(ss, method);
443 handler_details(ss, method);
444 stackmap_details(ss, method);
445 }
446 }
447
448 void ErrorContext::reason_details(outputStream* ss) const {
449 streamIndentor si(ss);
450 ss->indent().print_cr("Reason:");
451 streamIndentor si2(ss);
452 ss->indent().print("%s", "");
453 switch (_fault) {
454 case INVALID_BYTECODE:
455 ss->print("Error exists in the bytecode");
456 break;
457 case WRONG_TYPE:
458 if (_expected.is_valid()) {
459 ss->print("Type ");
460 _type.details(ss);
461 ss->print(" is not assignable to ");
462 _expected.details(ss);
463 } else {
464 ss->print("Invalid type: ");
465 _type.details(ss);
466 }
467 break;
468 case FLAGS_MISMATCH:
469 if (_expected.is_valid()) {
470 ss->print("Current frame's flags are not assignable "
471 "to stack map frame's.");
472 } else {
473 ss->print("Current frame's flags are invalid in this context.");
474 }
475 break;
476 case BAD_CP_INDEX:
477 ss->print("Constant pool index %d is invalid", _type.index());
478 break;
479 case BAD_LOCAL_INDEX:
480 ss->print("Local index %d is invalid", _type.index());
481 break;
482 case LOCALS_SIZE_MISMATCH:
483 ss->print("Current frame's local size doesn't match stackmap.");
484 break;
485 case STACK_SIZE_MISMATCH:
486 ss->print("Current frame's stack size doesn't match stackmap.");
487 break;
488 case STACK_OVERFLOW:
489 ss->print("Exceeded max stack size.");
490 break;
491 case STACK_UNDERFLOW:
492 ss->print("Attempt to pop empty stack.");
493 break;
494 case MISSING_STACKMAP:
495 ss->print("Expected stackmap frame at this location.");
496 break;
497 case BAD_STACKMAP:
498 ss->print("Invalid stackmap specification.");
499 break;
500 case WRONG_INLINE_TYPE:
501 ss->print("Type ");
502 _type.details(ss);
503 ss->print(" and type ");
504 _expected.details(ss);
505 ss->print(" must be identical inline types.");
506 break;
507 case UNKNOWN:
508 default:
509 ShouldNotReachHere();
510 ss->print_cr("Unknown");
511 }
512 ss->cr();
513 }
514
515 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
516 if (_bci != -1 && method != nullptr) {
517 streamIndentor si(ss);
518 const char* bytecode_name = "<invalid>";
519 if (method->validate_bci(_bci) != -1) {
520 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
521 if (Bytecodes::is_defined(code)) {
522 bytecode_name = Bytecodes::name(code);
523 } else {
524 bytecode_name = "<illegal>";
525 }
526 }
527 InstanceKlass* ik = method->method_holder();
528 ss->indent().print_cr("Location:");
529 streamIndentor si2(ss);
530 ss->indent().print_cr("%s.%s%s @%d: %s",
531 ik->name()->as_C_string(), method->name()->as_C_string(),
532 method->signature()->as_C_string(), _bci, bytecode_name);
533 }
534 }
535
536 void ErrorContext::frame_details(outputStream* ss) const {
537 streamIndentor si(ss);
538 if (_type.is_valid() && _type.frame() != nullptr) {
539 ss->indent().print_cr("Current Frame:");
540 streamIndentor si2(ss);
541 _type.frame()->print_on(ss);
542 }
543 if (_expected.is_valid() && _expected.frame() != nullptr) {
544 ss->indent().print_cr("Stackmap Frame:");
545 streamIndentor si2(ss);
546 _expected.frame()->print_on(ss);
547 }
548 }
549
550 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
551 if (method != nullptr) {
552 streamIndentor si(ss);
553 ss->indent().print_cr("Bytecode:");
554 streamIndentor si2(ss);
555 ss->print_data(method->code_base(), method->code_size(), false);
556 }
557 }
558
559 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
560 if (method != nullptr) {
561 streamIndentor si(ss);
562 ExceptionTable table(method);
563 if (table.length() > 0) {
564 ss->indent().print_cr("Exception Handler Table:");
565 streamIndentor si2(ss);
566 for (int i = 0; i < table.length(); ++i) {
567 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
568 table.end_pc(i), table.handler_pc(i));
569 }
570 }
571 }
572 }
573
574 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
575 if (method != nullptr && method->has_stackmap_table()) {
576 streamIndentor si(ss);
577 ss->indent().print_cr("Stackmap Table:");
578 Array<u1>* data = method->stackmap_data();
579 stack_map_table* sm_table =
580 stack_map_table::at((address)data->adr_at(0));
581 stack_map_frame* sm_frame = sm_table->entries();
582 streamIndentor si2(ss);
583 int current_offset = -1;
584 address end_of_sm_table = (address)sm_table + method->stackmap_data()->length();
585 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
586 ss->indent();
587 if (!sm_frame->verify((address)sm_frame, end_of_sm_table)) {
588 sm_frame->print_truncated(ss, current_offset);
589 return;
590 }
591 sm_frame->print_on(ss, current_offset);
592 ss->cr();
593 current_offset += sm_frame->offset_delta();
594 sm_frame = sm_frame->next();
595 }
596 }
597 }
598
599 // Methods in ClassVerifier
600
601 VerificationType reference_or_inline_type(InstanceKlass* klass) {
602 // if (klass->is_inline_klass()) {
603 // return VerificationType::inline_type(klass->name());
604 // } else {
605 // return VerificationType::reference_type(klass->name());
606 // } // LW401 CR required: verifier update/cleanup
607 return VerificationType::reference_type(klass->name());
608 }
609
610 ClassVerifier::ClassVerifier(JavaThread* current, InstanceKlass* klass)
611 : _thread(current), _previous_symbol(nullptr), _symbols(nullptr), _exception_type(nullptr),
612 _message(nullptr), _klass(klass) {
613 _this_type = reference_or_inline_type(klass);
614 }
615
616 ClassVerifier::~ClassVerifier() {
617 // Decrement the reference count for any symbols created.
618 if (_symbols != nullptr) {
619 for (int i = 0; i < _symbols->length(); i++) {
620 Symbol* s = _symbols->at(i);
621 s->decrement_refcount();
622 }
623 }
624 }
625
626 VerificationType ClassVerifier::object_type() const {
627 return VerificationType::reference_type(vmSymbols::java_lang_Object());
628 }
629
630 TypeOrigin ClassVerifier::ref_ctx(const char* sig) {
631 VerificationType vt = VerificationType::reference_type(
632 create_temporary_symbol(sig, (int)strlen(sig)));
633 return TypeOrigin::implicit(vt);
634 }
635
636
637 void ClassVerifier::verify_class(TRAPS) {
638 log_info(verification)("Verifying class %s with new format", _klass->external_name());
639
640 // Either verifying both local and remote classes or just remote classes.
641 assert(BytecodeVerificationRemote, "Should not be here");
642
643 Array<Method*>* methods = _klass->methods();
644 int num_methods = methods->length();
645
646 for (int index = 0; index < num_methods; index++) {
647 // Check for recursive re-verification before each method.
648 if (was_recursively_verified()) return;
649
650 Method* m = methods->at(index);
651 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
652 // If m is native or abstract, skip it. It is checked in class file
653 // parser that methods do not override a final method. Overpass methods
654 // are trusted since the VM generates them.
655 continue;
656 }
657 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
658 }
659
660 if (was_recursively_verified()){
661 log_info(verification)("Recursive verification detected for: %s", _klass->external_name());
662 log_info(class, init)("Recursive verification detected for: %s",
663 _klass->external_name());
664 }
665 }
666
667 // Translate the signature entries into verification types and save them in
668 // the growable array. Also, save the count of arguments.
669 void ClassVerifier::translate_signature(Symbol* const method_sig,
670 sig_as_verification_types* sig_verif_types) {
671 SignatureStream sig_stream(method_sig);
672 VerificationType sig_type[2];
673 int sig_i = 0;
674 GrowableArray<VerificationType>* verif_types = sig_verif_types->sig_verif_types();
675
676 // Translate the signature arguments into verification types.
677 while (!sig_stream.at_return_type()) {
678 int n = change_sig_to_verificationType(&sig_stream, sig_type);
679 assert(n <= 2, "Unexpected signature type");
680
681 // Store verification type(s). Longs and Doubles each have two verificationTypes.
682 for (int x = 0; x < n; x++) {
683 verif_types->push(sig_type[x]);
684 }
685 sig_i += n;
686 sig_stream.next();
687 }
688
689 // Set final arg count, not including the return type. The final arg count will
690 // be compared with sig_verify_types' length to see if there is a return type.
691 sig_verif_types->set_num_args(sig_i);
692
693 // Store verification type(s) for the return type, if there is one.
694 if (sig_stream.type() != T_VOID) {
695 int n = change_sig_to_verificationType(&sig_stream, sig_type);
696 assert(n <= 2, "Unexpected signature return type");
697 for (int y = 0; y < n; y++) {
698 verif_types->push(sig_type[y]);
699 }
700 }
701 }
702
703 void ClassVerifier::create_method_sig_entry(sig_as_verification_types* sig_verif_types,
704 int sig_index) {
705 // Translate the signature into verification types.
706 ConstantPool* cp = _klass->constants();
707 Symbol* const method_sig = cp->symbol_at(sig_index);
708 translate_signature(method_sig, sig_verif_types);
709
710 // Add the list of this signature's verification types to the table.
711 bool is_unique = method_signatures_table()->put(sig_index, sig_verif_types);
712 assert(is_unique, "Duplicate entries in method_signature_table");
713 }
714
715 void ClassVerifier::verify_method(const methodHandle& m, TRAPS) {
716 HandleMark hm(THREAD);
717 _method = m; // initialize _method
718 log_info(verification)("Verifying method %s", m->name_and_sig_as_C_string());
719
720 // For clang, the only good constant format string is a literal constant format string.
721 #define bad_type_msg "Bad type on operand stack in %s"
722
723 u2 max_stack = m->verifier_max_stack();
724 u2 max_locals = m->max_locals();
725 constantPoolHandle cp(THREAD, m->constants());
726
727 // Method signature was checked in ClassFileParser.
728 assert(SignatureVerifier::is_valid_method_signature(m->signature()),
729 "Invalid method signature");
730
731 // Initial stack map frame: offset is 0, stack is initially empty.
732 StackMapFrame current_frame(max_locals, max_stack, this);
733 // Set initial locals
734 VerificationType return_type = current_frame.set_locals_from_arg( m, current_type());
735
736 u2 stackmap_index = 0; // index to the stackmap array
737
738 u4 code_length = m->code_size();
739
740 // Scan the bytecode and map each instruction's start offset to a number.
741 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
742
743 int ex_min = code_length;
744 int ex_max = -1;
745 // Look through each item on the exception table. Each of the fields must refer
746 // to a legal instruction.
747 if (was_recursively_verified()) return;
748 verify_exception_handler_table(
749 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
750
751 // Look through each entry on the local variable table and make sure
752 // its range of code array offsets is valid. (4169817)
753 if (m->has_localvariable_table()) {
754 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
755 }
756
757 Array<u1>* stackmap_data = m->stackmap_data();
758 StackMapStream stream(stackmap_data);
759 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
760 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
761 code_data, code_length, CHECK_VERIFY(this));
762
763 LogTarget(Debug, verification) lt;
764 if (lt.is_enabled()) {
765 ResourceMark rm(THREAD);
766 LogStream ls(lt);
767 stackmap_table.print_on(&ls);
768 }
769
770 RawBytecodeStream bcs(m);
771
772 // Scan the byte code linearly from the start to the end
773 bool no_control_flow = false; // Set to true when there is no direct control
774 // flow from current instruction to the next
775 // instruction in sequence
776
777 Bytecodes::Code opcode;
778 while (!bcs.is_last_bytecode()) {
779 // Check for recursive re-verification before each bytecode.
780 if (was_recursively_verified()) return;
781
782 opcode = bcs.raw_next();
783 int bci = bcs.bci();
784
785 // Set current frame's offset to bci
786 current_frame.set_offset(bci);
787 current_frame.set_mark();
788
789 // Make sure every offset in stackmap table point to the beginning to
790 // an instruction. Match current_frame to stackmap_table entry with
791 // the same offset if exists.
792 stackmap_index = verify_stackmap_table(
793 stackmap_index, bci, ¤t_frame, &stackmap_table,
794 no_control_flow, CHECK_VERIFY(this));
795
796
797 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
798 bool verified_exc_handlers = false;
799
800 // Merge with the next instruction
801 {
802 int target;
803 VerificationType type, type2;
804 VerificationType atype;
805
806 LogTarget(Debug, verification) lt;
807 if (lt.is_enabled()) {
808 ResourceMark rm(THREAD);
809 LogStream ls(lt);
810 current_frame.print_on(&ls);
811 lt.print("offset = %d, opcode = %s", bci,
812 opcode == Bytecodes::_illegal ? "illegal" : Bytecodes::name(opcode));
813 }
814
815 // Make sure wide instruction is in correct format
816 if (bcs.is_wide()) {
817 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
818 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
819 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
820 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
821 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
822 opcode != Bytecodes::_dstore) {
823 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
824 * if we encounter a wide instruction that modifies an invalid
825 * opcode (not one of the ones listed above) */
826 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
827 return;
828 }
829 }
830
831 // Look for possible jump target in exception handlers and see if it
832 // matches current_frame. Do this check here for astore*, dstore*,
833 // fstore*, istore*, and lstore* opcodes because they can change the type
834 // state by adding a local. JVM Spec says that the incoming type state
835 // should be used for this check. So, do the check here before a possible
836 // local is added to the type state.
837 if (Bytecodes::is_store_into_local(opcode) && bci >= ex_min && bci < ex_max) {
838 if (was_recursively_verified()) return;
839 verify_exception_handler_targets(
840 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
841 verified_exc_handlers = true;
842 }
843
844 if (was_recursively_verified()) return;
845
846 switch (opcode) {
847 case Bytecodes::_nop :
848 no_control_flow = false; break;
849 case Bytecodes::_aconst_null :
850 current_frame.push_stack(
851 VerificationType::null_type(), CHECK_VERIFY(this));
852 no_control_flow = false; break;
853 case Bytecodes::_iconst_m1 :
854 case Bytecodes::_iconst_0 :
855 case Bytecodes::_iconst_1 :
856 case Bytecodes::_iconst_2 :
857 case Bytecodes::_iconst_3 :
858 case Bytecodes::_iconst_4 :
859 case Bytecodes::_iconst_5 :
860 current_frame.push_stack(
861 VerificationType::integer_type(), CHECK_VERIFY(this));
862 no_control_flow = false; break;
863 case Bytecodes::_lconst_0 :
864 case Bytecodes::_lconst_1 :
865 current_frame.push_stack_2(
866 VerificationType::long_type(),
867 VerificationType::long2_type(), CHECK_VERIFY(this));
868 no_control_flow = false; break;
869 case Bytecodes::_fconst_0 :
870 case Bytecodes::_fconst_1 :
871 case Bytecodes::_fconst_2 :
872 current_frame.push_stack(
873 VerificationType::float_type(), CHECK_VERIFY(this));
874 no_control_flow = false; break;
875 case Bytecodes::_dconst_0 :
876 case Bytecodes::_dconst_1 :
877 current_frame.push_stack_2(
878 VerificationType::double_type(),
879 VerificationType::double2_type(), CHECK_VERIFY(this));
880 no_control_flow = false; break;
881 case Bytecodes::_sipush :
882 case Bytecodes::_bipush :
883 current_frame.push_stack(
884 VerificationType::integer_type(), CHECK_VERIFY(this));
885 no_control_flow = false; break;
886 case Bytecodes::_ldc :
887 verify_ldc(
888 opcode, bcs.get_index_u1(), ¤t_frame,
889 cp, bci, CHECK_VERIFY(this));
890 no_control_flow = false; break;
891 case Bytecodes::_ldc_w :
892 case Bytecodes::_ldc2_w :
893 verify_ldc(
894 opcode, bcs.get_index_u2(), ¤t_frame,
895 cp, bci, CHECK_VERIFY(this));
896 no_control_flow = false; break;
897 case Bytecodes::_iload :
898 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
899 no_control_flow = false; break;
900 case Bytecodes::_iload_0 :
901 case Bytecodes::_iload_1 :
902 case Bytecodes::_iload_2 :
903 case Bytecodes::_iload_3 : {
904 int index = opcode - Bytecodes::_iload_0;
905 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
906 no_control_flow = false; break;
907 }
908 case Bytecodes::_lload :
909 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
910 no_control_flow = false; break;
911 case Bytecodes::_lload_0 :
912 case Bytecodes::_lload_1 :
913 case Bytecodes::_lload_2 :
914 case Bytecodes::_lload_3 : {
915 int index = opcode - Bytecodes::_lload_0;
916 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
917 no_control_flow = false; break;
918 }
919 case Bytecodes::_fload :
920 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
921 no_control_flow = false; break;
922 case Bytecodes::_fload_0 :
923 case Bytecodes::_fload_1 :
924 case Bytecodes::_fload_2 :
925 case Bytecodes::_fload_3 : {
926 int index = opcode - Bytecodes::_fload_0;
927 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
928 no_control_flow = false; break;
929 }
930 case Bytecodes::_dload :
931 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
932 no_control_flow = false; break;
933 case Bytecodes::_dload_0 :
934 case Bytecodes::_dload_1 :
935 case Bytecodes::_dload_2 :
936 case Bytecodes::_dload_3 : {
937 int index = opcode - Bytecodes::_dload_0;
938 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
939 no_control_flow = false; break;
940 }
941 case Bytecodes::_aload :
942 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
943 no_control_flow = false; break;
944 case Bytecodes::_aload_0 :
945 case Bytecodes::_aload_1 :
946 case Bytecodes::_aload_2 :
947 case Bytecodes::_aload_3 : {
948 int index = opcode - Bytecodes::_aload_0;
949 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
950 no_control_flow = false; break;
951 }
952 case Bytecodes::_iaload :
953 type = current_frame.pop_stack(
954 VerificationType::integer_type(), CHECK_VERIFY(this));
955 atype = current_frame.pop_stack(
956 VerificationType::reference_check(), CHECK_VERIFY(this));
957 if (!atype.is_int_array()) {
958 verify_error(ErrorContext::bad_type(bci,
959 current_frame.stack_top_ctx(), ref_ctx("[I")),
960 bad_type_msg, "iaload");
961 return;
962 }
963 current_frame.push_stack(
964 VerificationType::integer_type(), CHECK_VERIFY(this));
965 no_control_flow = false; break;
966 case Bytecodes::_baload :
967 type = current_frame.pop_stack(
968 VerificationType::integer_type(), CHECK_VERIFY(this));
969 atype = current_frame.pop_stack(
970 VerificationType::reference_check(), CHECK_VERIFY(this));
971 if (!atype.is_bool_array() && !atype.is_byte_array()) {
972 verify_error(
973 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
974 bad_type_msg, "baload");
975 return;
976 }
977 current_frame.push_stack(
978 VerificationType::integer_type(), CHECK_VERIFY(this));
979 no_control_flow = false; break;
980 case Bytecodes::_caload :
981 type = current_frame.pop_stack(
982 VerificationType::integer_type(), CHECK_VERIFY(this));
983 atype = current_frame.pop_stack(
984 VerificationType::reference_check(), CHECK_VERIFY(this));
985 if (!atype.is_char_array()) {
986 verify_error(ErrorContext::bad_type(bci,
987 current_frame.stack_top_ctx(), ref_ctx("[C")),
988 bad_type_msg, "caload");
989 return;
990 }
991 current_frame.push_stack(
992 VerificationType::integer_type(), CHECK_VERIFY(this));
993 no_control_flow = false; break;
994 case Bytecodes::_saload :
995 type = current_frame.pop_stack(
996 VerificationType::integer_type(), CHECK_VERIFY(this));
997 atype = current_frame.pop_stack(
998 VerificationType::reference_check(), CHECK_VERIFY(this));
999 if (!atype.is_short_array()) {
1000 verify_error(ErrorContext::bad_type(bci,
1001 current_frame.stack_top_ctx(), ref_ctx("[S")),
1002 bad_type_msg, "saload");
1003 return;
1004 }
1005 current_frame.push_stack(
1006 VerificationType::integer_type(), CHECK_VERIFY(this));
1007 no_control_flow = false; break;
1008 case Bytecodes::_laload :
1009 type = current_frame.pop_stack(
1010 VerificationType::integer_type(), CHECK_VERIFY(this));
1011 atype = current_frame.pop_stack(
1012 VerificationType::reference_check(), CHECK_VERIFY(this));
1013 if (!atype.is_long_array()) {
1014 verify_error(ErrorContext::bad_type(bci,
1015 current_frame.stack_top_ctx(), ref_ctx("[J")),
1016 bad_type_msg, "laload");
1017 return;
1018 }
1019 current_frame.push_stack_2(
1020 VerificationType::long_type(),
1021 VerificationType::long2_type(), CHECK_VERIFY(this));
1022 no_control_flow = false; break;
1023 case Bytecodes::_faload :
1024 type = current_frame.pop_stack(
1025 VerificationType::integer_type(), CHECK_VERIFY(this));
1026 atype = current_frame.pop_stack(
1027 VerificationType::reference_check(), CHECK_VERIFY(this));
1028 if (!atype.is_float_array()) {
1029 verify_error(ErrorContext::bad_type(bci,
1030 current_frame.stack_top_ctx(), ref_ctx("[F")),
1031 bad_type_msg, "faload");
1032 return;
1033 }
1034 current_frame.push_stack(
1035 VerificationType::float_type(), CHECK_VERIFY(this));
1036 no_control_flow = false; break;
1037 case Bytecodes::_daload :
1038 type = current_frame.pop_stack(
1039 VerificationType::integer_type(), CHECK_VERIFY(this));
1040 atype = current_frame.pop_stack(
1041 VerificationType::reference_check(), CHECK_VERIFY(this));
1042 if (!atype.is_double_array()) {
1043 verify_error(ErrorContext::bad_type(bci,
1044 current_frame.stack_top_ctx(), ref_ctx("[D")),
1045 bad_type_msg, "daload");
1046 return;
1047 }
1048 current_frame.push_stack_2(
1049 VerificationType::double_type(),
1050 VerificationType::double2_type(), CHECK_VERIFY(this));
1051 no_control_flow = false; break;
1052 case Bytecodes::_aaload : {
1053 type = current_frame.pop_stack(
1054 VerificationType::integer_type(), CHECK_VERIFY(this));
1055 atype = current_frame.pop_stack(
1056 VerificationType::reference_check(), CHECK_VERIFY(this));
1057 if (!atype.is_nonscalar_array()) {
1058 verify_error(ErrorContext::bad_type(bci,
1059 current_frame.stack_top_ctx(),
1060 TypeOrigin::implicit(VerificationType::reference_check())),
1061 bad_type_msg, "aaload");
1062 return;
1063 }
1064 if (atype.is_null()) {
1065 current_frame.push_stack(
1066 VerificationType::null_type(), CHECK_VERIFY(this));
1067 } else {
1068 VerificationType component = atype.get_component(this);
1069 current_frame.push_stack(component, CHECK_VERIFY(this));
1070 }
1071 no_control_flow = false; break;
1072 }
1073 case Bytecodes::_istore :
1074 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1075 no_control_flow = false; break;
1076 case Bytecodes::_istore_0 :
1077 case Bytecodes::_istore_1 :
1078 case Bytecodes::_istore_2 :
1079 case Bytecodes::_istore_3 : {
1080 int index = opcode - Bytecodes::_istore_0;
1081 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
1082 no_control_flow = false; break;
1083 }
1084 case Bytecodes::_lstore :
1085 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1086 no_control_flow = false; break;
1087 case Bytecodes::_lstore_0 :
1088 case Bytecodes::_lstore_1 :
1089 case Bytecodes::_lstore_2 :
1090 case Bytecodes::_lstore_3 : {
1091 int index = opcode - Bytecodes::_lstore_0;
1092 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
1093 no_control_flow = false; break;
1094 }
1095 case Bytecodes::_fstore :
1096 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1097 no_control_flow = false; break;
1098 case Bytecodes::_fstore_0 :
1099 case Bytecodes::_fstore_1 :
1100 case Bytecodes::_fstore_2 :
1101 case Bytecodes::_fstore_3 : {
1102 int index = opcode - Bytecodes::_fstore_0;
1103 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
1104 no_control_flow = false; break;
1105 }
1106 case Bytecodes::_dstore :
1107 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1108 no_control_flow = false; break;
1109 case Bytecodes::_dstore_0 :
1110 case Bytecodes::_dstore_1 :
1111 case Bytecodes::_dstore_2 :
1112 case Bytecodes::_dstore_3 : {
1113 int index = opcode - Bytecodes::_dstore_0;
1114 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
1115 no_control_flow = false; break;
1116 }
1117 case Bytecodes::_astore :
1118 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1119 no_control_flow = false; break;
1120 case Bytecodes::_astore_0 :
1121 case Bytecodes::_astore_1 :
1122 case Bytecodes::_astore_2 :
1123 case Bytecodes::_astore_3 : {
1124 int index = opcode - Bytecodes::_astore_0;
1125 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
1126 no_control_flow = false; break;
1127 }
1128 case Bytecodes::_iastore :
1129 type = current_frame.pop_stack(
1130 VerificationType::integer_type(), CHECK_VERIFY(this));
1131 type2 = current_frame.pop_stack(
1132 VerificationType::integer_type(), CHECK_VERIFY(this));
1133 atype = current_frame.pop_stack(
1134 VerificationType::reference_check(), CHECK_VERIFY(this));
1135 if (!atype.is_int_array()) {
1136 verify_error(ErrorContext::bad_type(bci,
1137 current_frame.stack_top_ctx(), ref_ctx("[I")),
1138 bad_type_msg, "iastore");
1139 return;
1140 }
1141 no_control_flow = false; break;
1142 case Bytecodes::_bastore :
1143 type = current_frame.pop_stack(
1144 VerificationType::integer_type(), CHECK_VERIFY(this));
1145 type2 = current_frame.pop_stack(
1146 VerificationType::integer_type(), CHECK_VERIFY(this));
1147 atype = current_frame.pop_stack(
1148 VerificationType::reference_check(), CHECK_VERIFY(this));
1149 if (!atype.is_bool_array() && !atype.is_byte_array()) {
1150 verify_error(
1151 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1152 bad_type_msg, "bastore");
1153 return;
1154 }
1155 no_control_flow = false; break;
1156 case Bytecodes::_castore :
1157 current_frame.pop_stack(
1158 VerificationType::integer_type(), CHECK_VERIFY(this));
1159 current_frame.pop_stack(
1160 VerificationType::integer_type(), CHECK_VERIFY(this));
1161 atype = current_frame.pop_stack(
1162 VerificationType::reference_check(), CHECK_VERIFY(this));
1163 if (!atype.is_char_array()) {
1164 verify_error(ErrorContext::bad_type(bci,
1165 current_frame.stack_top_ctx(), ref_ctx("[C")),
1166 bad_type_msg, "castore");
1167 return;
1168 }
1169 no_control_flow = false; break;
1170 case Bytecodes::_sastore :
1171 current_frame.pop_stack(
1172 VerificationType::integer_type(), CHECK_VERIFY(this));
1173 current_frame.pop_stack(
1174 VerificationType::integer_type(), CHECK_VERIFY(this));
1175 atype = current_frame.pop_stack(
1176 VerificationType::reference_check(), CHECK_VERIFY(this));
1177 if (!atype.is_short_array()) {
1178 verify_error(ErrorContext::bad_type(bci,
1179 current_frame.stack_top_ctx(), ref_ctx("[S")),
1180 bad_type_msg, "sastore");
1181 return;
1182 }
1183 no_control_flow = false; break;
1184 case Bytecodes::_lastore :
1185 current_frame.pop_stack_2(
1186 VerificationType::long2_type(),
1187 VerificationType::long_type(), CHECK_VERIFY(this));
1188 current_frame.pop_stack(
1189 VerificationType::integer_type(), CHECK_VERIFY(this));
1190 atype = current_frame.pop_stack(
1191 VerificationType::reference_check(), CHECK_VERIFY(this));
1192 if (!atype.is_long_array()) {
1193 verify_error(ErrorContext::bad_type(bci,
1194 current_frame.stack_top_ctx(), ref_ctx("[J")),
1195 bad_type_msg, "lastore");
1196 return;
1197 }
1198 no_control_flow = false; break;
1199 case Bytecodes::_fastore :
1200 current_frame.pop_stack(
1201 VerificationType::float_type(), CHECK_VERIFY(this));
1202 current_frame.pop_stack
1203 (VerificationType::integer_type(), CHECK_VERIFY(this));
1204 atype = current_frame.pop_stack(
1205 VerificationType::reference_check(), CHECK_VERIFY(this));
1206 if (!atype.is_float_array()) {
1207 verify_error(ErrorContext::bad_type(bci,
1208 current_frame.stack_top_ctx(), ref_ctx("[F")),
1209 bad_type_msg, "fastore");
1210 return;
1211 }
1212 no_control_flow = false; break;
1213 case Bytecodes::_dastore :
1214 current_frame.pop_stack_2(
1215 VerificationType::double2_type(),
1216 VerificationType::double_type(), CHECK_VERIFY(this));
1217 current_frame.pop_stack(
1218 VerificationType::integer_type(), CHECK_VERIFY(this));
1219 atype = current_frame.pop_stack(
1220 VerificationType::reference_check(), CHECK_VERIFY(this));
1221 if (!atype.is_double_array()) {
1222 verify_error(ErrorContext::bad_type(bci,
1223 current_frame.stack_top_ctx(), ref_ctx("[D")),
1224 bad_type_msg, "dastore");
1225 return;
1226 }
1227 no_control_flow = false; break;
1228 case Bytecodes::_aastore :
1229 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1230 type2 = current_frame.pop_stack(
1231 VerificationType::integer_type(), CHECK_VERIFY(this));
1232 atype = current_frame.pop_stack(
1233 VerificationType::reference_check(), CHECK_VERIFY(this));
1234 // more type-checking is done at runtime
1235 if (!atype.is_nonscalar_array()) {
1236 verify_error(ErrorContext::bad_type(bci,
1237 current_frame.stack_top_ctx(),
1238 TypeOrigin::implicit(VerificationType::reference_check())),
1239 bad_type_msg, "aastore");
1240 return;
1241 }
1242 // 4938384: relaxed constraint in JVMS 3rd edition.
1243 no_control_flow = false; break;
1244 case Bytecodes::_pop :
1245 current_frame.pop_stack(
1246 VerificationType::category1_check(), CHECK_VERIFY(this));
1247 no_control_flow = false; break;
1248 case Bytecodes::_pop2 :
1249 type = current_frame.pop_stack(CHECK_VERIFY(this));
1250 if (type.is_category1()) {
1251 current_frame.pop_stack(
1252 VerificationType::category1_check(), CHECK_VERIFY(this));
1253 } else if (type.is_category2_2nd()) {
1254 current_frame.pop_stack(
1255 VerificationType::category2_check(), CHECK_VERIFY(this));
1256 } else {
1257 /* Unreachable? Would need a category2_1st on TOS
1258 * which does not appear possible. */
1259 verify_error(
1260 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1261 bad_type_msg, "pop2");
1262 return;
1263 }
1264 no_control_flow = false; break;
1265 case Bytecodes::_dup :
1266 type = current_frame.pop_stack(
1267 VerificationType::category1_check(), CHECK_VERIFY(this));
1268 current_frame.push_stack(type, CHECK_VERIFY(this));
1269 current_frame.push_stack(type, CHECK_VERIFY(this));
1270 no_control_flow = false; break;
1271 case Bytecodes::_dup_x1 :
1272 type = current_frame.pop_stack(
1273 VerificationType::category1_check(), CHECK_VERIFY(this));
1274 type2 = current_frame.pop_stack(
1275 VerificationType::category1_check(), CHECK_VERIFY(this));
1276 current_frame.push_stack(type, CHECK_VERIFY(this));
1277 current_frame.push_stack(type2, CHECK_VERIFY(this));
1278 current_frame.push_stack(type, CHECK_VERIFY(this));
1279 no_control_flow = false; break;
1280 case Bytecodes::_dup_x2 :
1281 {
1282 VerificationType type3;
1283 type = current_frame.pop_stack(
1284 VerificationType::category1_check(), CHECK_VERIFY(this));
1285 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1286 if (type2.is_category1()) {
1287 type3 = current_frame.pop_stack(
1288 VerificationType::category1_check(), CHECK_VERIFY(this));
1289 } else if (type2.is_category2_2nd()) {
1290 type3 = current_frame.pop_stack(
1291 VerificationType::category2_check(), CHECK_VERIFY(this));
1292 } else {
1293 /* Unreachable? Would need a category2_1st at stack depth 2 with
1294 * a category1 on TOS which does not appear possible. */
1295 verify_error(ErrorContext::bad_type(
1296 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1297 return;
1298 }
1299 current_frame.push_stack(type, CHECK_VERIFY(this));
1300 current_frame.push_stack(type3, CHECK_VERIFY(this));
1301 current_frame.push_stack(type2, CHECK_VERIFY(this));
1302 current_frame.push_stack(type, CHECK_VERIFY(this));
1303 no_control_flow = false; break;
1304 }
1305 case Bytecodes::_dup2 :
1306 type = current_frame.pop_stack(CHECK_VERIFY(this));
1307 if (type.is_category1()) {
1308 type2 = current_frame.pop_stack(
1309 VerificationType::category1_check(), CHECK_VERIFY(this));
1310 } else if (type.is_category2_2nd()) {
1311 type2 = current_frame.pop_stack(
1312 VerificationType::category2_check(), CHECK_VERIFY(this));
1313 } else {
1314 /* Unreachable? Would need a category2_1st on TOS which does not
1315 * appear possible. */
1316 verify_error(
1317 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1318 bad_type_msg, "dup2");
1319 return;
1320 }
1321 current_frame.push_stack(type2, CHECK_VERIFY(this));
1322 current_frame.push_stack(type, CHECK_VERIFY(this));
1323 current_frame.push_stack(type2, CHECK_VERIFY(this));
1324 current_frame.push_stack(type, CHECK_VERIFY(this));
1325 no_control_flow = false; break;
1326 case Bytecodes::_dup2_x1 :
1327 {
1328 VerificationType type3;
1329 type = current_frame.pop_stack(CHECK_VERIFY(this));
1330 if (type.is_category1()) {
1331 type2 = current_frame.pop_stack(
1332 VerificationType::category1_check(), CHECK_VERIFY(this));
1333 } else if (type.is_category2_2nd()) {
1334 type2 = current_frame.pop_stack(
1335 VerificationType::category2_check(), CHECK_VERIFY(this));
1336 } else {
1337 /* Unreachable? Would need a category2_1st on TOS which does
1338 * not appear possible. */
1339 verify_error(
1340 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1341 bad_type_msg, "dup2_x1");
1342 return;
1343 }
1344 type3 = current_frame.pop_stack(
1345 VerificationType::category1_check(), CHECK_VERIFY(this));
1346 current_frame.push_stack(type2, CHECK_VERIFY(this));
1347 current_frame.push_stack(type, CHECK_VERIFY(this));
1348 current_frame.push_stack(type3, CHECK_VERIFY(this));
1349 current_frame.push_stack(type2, CHECK_VERIFY(this));
1350 current_frame.push_stack(type, CHECK_VERIFY(this));
1351 no_control_flow = false; break;
1352 }
1353 case Bytecodes::_dup2_x2 :
1354 {
1355 VerificationType type3, type4;
1356 type = current_frame.pop_stack(CHECK_VERIFY(this));
1357 if (type.is_category1()) {
1358 type2 = current_frame.pop_stack(
1359 VerificationType::category1_check(), CHECK_VERIFY(this));
1360 } else if (type.is_category2_2nd()) {
1361 type2 = current_frame.pop_stack(
1362 VerificationType::category2_check(), CHECK_VERIFY(this));
1363 } else {
1364 /* Unreachable? Would need a category2_1st on TOS which does
1365 * not appear possible. */
1366 verify_error(
1367 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1368 bad_type_msg, "dup2_x2");
1369 return;
1370 }
1371 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1372 if (type3.is_category1()) {
1373 type4 = current_frame.pop_stack(
1374 VerificationType::category1_check(), CHECK_VERIFY(this));
1375 } else if (type3.is_category2_2nd()) {
1376 type4 = current_frame.pop_stack(
1377 VerificationType::category2_check(), CHECK_VERIFY(this));
1378 } else {
1379 /* Unreachable? Would need a category2_1st on TOS after popping
1380 * a long/double or two category 1's, which does not
1381 * appear possible. */
1382 verify_error(
1383 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1384 bad_type_msg, "dup2_x2");
1385 return;
1386 }
1387 current_frame.push_stack(type2, CHECK_VERIFY(this));
1388 current_frame.push_stack(type, CHECK_VERIFY(this));
1389 current_frame.push_stack(type4, CHECK_VERIFY(this));
1390 current_frame.push_stack(type3, CHECK_VERIFY(this));
1391 current_frame.push_stack(type2, CHECK_VERIFY(this));
1392 current_frame.push_stack(type, CHECK_VERIFY(this));
1393 no_control_flow = false; break;
1394 }
1395 case Bytecodes::_swap :
1396 type = current_frame.pop_stack(
1397 VerificationType::category1_check(), CHECK_VERIFY(this));
1398 type2 = current_frame.pop_stack(
1399 VerificationType::category1_check(), CHECK_VERIFY(this));
1400 current_frame.push_stack(type, CHECK_VERIFY(this));
1401 current_frame.push_stack(type2, CHECK_VERIFY(this));
1402 no_control_flow = false; break;
1403 case Bytecodes::_iadd :
1404 case Bytecodes::_isub :
1405 case Bytecodes::_imul :
1406 case Bytecodes::_idiv :
1407 case Bytecodes::_irem :
1408 case Bytecodes::_ishl :
1409 case Bytecodes::_ishr :
1410 case Bytecodes::_iushr :
1411 case Bytecodes::_ior :
1412 case Bytecodes::_ixor :
1413 case Bytecodes::_iand :
1414 current_frame.pop_stack(
1415 VerificationType::integer_type(), CHECK_VERIFY(this));
1416 // fall through
1417 case Bytecodes::_ineg :
1418 current_frame.pop_stack(
1419 VerificationType::integer_type(), CHECK_VERIFY(this));
1420 current_frame.push_stack(
1421 VerificationType::integer_type(), CHECK_VERIFY(this));
1422 no_control_flow = false; break;
1423 case Bytecodes::_ladd :
1424 case Bytecodes::_lsub :
1425 case Bytecodes::_lmul :
1426 case Bytecodes::_ldiv :
1427 case Bytecodes::_lrem :
1428 case Bytecodes::_land :
1429 case Bytecodes::_lor :
1430 case Bytecodes::_lxor :
1431 current_frame.pop_stack_2(
1432 VerificationType::long2_type(),
1433 VerificationType::long_type(), CHECK_VERIFY(this));
1434 // fall through
1435 case Bytecodes::_lneg :
1436 current_frame.pop_stack_2(
1437 VerificationType::long2_type(),
1438 VerificationType::long_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::_lshl :
1444 case Bytecodes::_lshr :
1445 case Bytecodes::_lushr :
1446 current_frame.pop_stack(
1447 VerificationType::integer_type(), CHECK_VERIFY(this));
1448 current_frame.pop_stack_2(
1449 VerificationType::long2_type(),
1450 VerificationType::long_type(), CHECK_VERIFY(this));
1451 current_frame.push_stack_2(
1452 VerificationType::long_type(),
1453 VerificationType::long2_type(), CHECK_VERIFY(this));
1454 no_control_flow = false; break;
1455 case Bytecodes::_fadd :
1456 case Bytecodes::_fsub :
1457 case Bytecodes::_fmul :
1458 case Bytecodes::_fdiv :
1459 case Bytecodes::_frem :
1460 current_frame.pop_stack(
1461 VerificationType::float_type(), CHECK_VERIFY(this));
1462 // fall through
1463 case Bytecodes::_fneg :
1464 current_frame.pop_stack(
1465 VerificationType::float_type(), CHECK_VERIFY(this));
1466 current_frame.push_stack(
1467 VerificationType::float_type(), CHECK_VERIFY(this));
1468 no_control_flow = false; break;
1469 case Bytecodes::_dadd :
1470 case Bytecodes::_dsub :
1471 case Bytecodes::_dmul :
1472 case Bytecodes::_ddiv :
1473 case Bytecodes::_drem :
1474 current_frame.pop_stack_2(
1475 VerificationType::double2_type(),
1476 VerificationType::double_type(), CHECK_VERIFY(this));
1477 // fall through
1478 case Bytecodes::_dneg :
1479 current_frame.pop_stack_2(
1480 VerificationType::double2_type(),
1481 VerificationType::double_type(), CHECK_VERIFY(this));
1482 current_frame.push_stack_2(
1483 VerificationType::double_type(),
1484 VerificationType::double2_type(), CHECK_VERIFY(this));
1485 no_control_flow = false; break;
1486 case Bytecodes::_iinc :
1487 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1488 no_control_flow = false; break;
1489 case Bytecodes::_i2l :
1490 type = current_frame.pop_stack(
1491 VerificationType::integer_type(), CHECK_VERIFY(this));
1492 current_frame.push_stack_2(
1493 VerificationType::long_type(),
1494 VerificationType::long2_type(), CHECK_VERIFY(this));
1495 no_control_flow = false; break;
1496 case Bytecodes::_l2i :
1497 current_frame.pop_stack_2(
1498 VerificationType::long2_type(),
1499 VerificationType::long_type(), CHECK_VERIFY(this));
1500 current_frame.push_stack(
1501 VerificationType::integer_type(), CHECK_VERIFY(this));
1502 no_control_flow = false; break;
1503 case Bytecodes::_i2f :
1504 current_frame.pop_stack(
1505 VerificationType::integer_type(), CHECK_VERIFY(this));
1506 current_frame.push_stack(
1507 VerificationType::float_type(), CHECK_VERIFY(this));
1508 no_control_flow = false; break;
1509 case Bytecodes::_i2d :
1510 current_frame.pop_stack(
1511 VerificationType::integer_type(), CHECK_VERIFY(this));
1512 current_frame.push_stack_2(
1513 VerificationType::double_type(),
1514 VerificationType::double2_type(), CHECK_VERIFY(this));
1515 no_control_flow = false; break;
1516 case Bytecodes::_l2f :
1517 current_frame.pop_stack_2(
1518 VerificationType::long2_type(),
1519 VerificationType::long_type(), CHECK_VERIFY(this));
1520 current_frame.push_stack(
1521 VerificationType::float_type(), CHECK_VERIFY(this));
1522 no_control_flow = false; break;
1523 case Bytecodes::_l2d :
1524 current_frame.pop_stack_2(
1525 VerificationType::long2_type(),
1526 VerificationType::long_type(), CHECK_VERIFY(this));
1527 current_frame.push_stack_2(
1528 VerificationType::double_type(),
1529 VerificationType::double2_type(), CHECK_VERIFY(this));
1530 no_control_flow = false; break;
1531 case Bytecodes::_f2i :
1532 current_frame.pop_stack(
1533 VerificationType::float_type(), CHECK_VERIFY(this));
1534 current_frame.push_stack(
1535 VerificationType::integer_type(), CHECK_VERIFY(this));
1536 no_control_flow = false; break;
1537 case Bytecodes::_f2l :
1538 current_frame.pop_stack(
1539 VerificationType::float_type(), CHECK_VERIFY(this));
1540 current_frame.push_stack_2(
1541 VerificationType::long_type(),
1542 VerificationType::long2_type(), CHECK_VERIFY(this));
1543 no_control_flow = false; break;
1544 case Bytecodes::_f2d :
1545 current_frame.pop_stack(
1546 VerificationType::float_type(), CHECK_VERIFY(this));
1547 current_frame.push_stack_2(
1548 VerificationType::double_type(),
1549 VerificationType::double2_type(), CHECK_VERIFY(this));
1550 no_control_flow = false; break;
1551 case Bytecodes::_d2i :
1552 current_frame.pop_stack_2(
1553 VerificationType::double2_type(),
1554 VerificationType::double_type(), CHECK_VERIFY(this));
1555 current_frame.push_stack(
1556 VerificationType::integer_type(), CHECK_VERIFY(this));
1557 no_control_flow = false; break;
1558 case Bytecodes::_d2l :
1559 current_frame.pop_stack_2(
1560 VerificationType::double2_type(),
1561 VerificationType::double_type(), CHECK_VERIFY(this));
1562 current_frame.push_stack_2(
1563 VerificationType::long_type(),
1564 VerificationType::long2_type(), CHECK_VERIFY(this));
1565 no_control_flow = false; break;
1566 case Bytecodes::_d2f :
1567 current_frame.pop_stack_2(
1568 VerificationType::double2_type(),
1569 VerificationType::double_type(), CHECK_VERIFY(this));
1570 current_frame.push_stack(
1571 VerificationType::float_type(), CHECK_VERIFY(this));
1572 no_control_flow = false; break;
1573 case Bytecodes::_i2b :
1574 case Bytecodes::_i2c :
1575 case Bytecodes::_i2s :
1576 current_frame.pop_stack(
1577 VerificationType::integer_type(), CHECK_VERIFY(this));
1578 current_frame.push_stack(
1579 VerificationType::integer_type(), CHECK_VERIFY(this));
1580 no_control_flow = false; break;
1581 case Bytecodes::_lcmp :
1582 current_frame.pop_stack_2(
1583 VerificationType::long2_type(),
1584 VerificationType::long_type(), CHECK_VERIFY(this));
1585 current_frame.pop_stack_2(
1586 VerificationType::long2_type(),
1587 VerificationType::long_type(), CHECK_VERIFY(this));
1588 current_frame.push_stack(
1589 VerificationType::integer_type(), CHECK_VERIFY(this));
1590 no_control_flow = false; break;
1591 case Bytecodes::_fcmpl :
1592 case Bytecodes::_fcmpg :
1593 current_frame.pop_stack(
1594 VerificationType::float_type(), CHECK_VERIFY(this));
1595 current_frame.pop_stack(
1596 VerificationType::float_type(), CHECK_VERIFY(this));
1597 current_frame.push_stack(
1598 VerificationType::integer_type(), CHECK_VERIFY(this));
1599 no_control_flow = false; break;
1600 case Bytecodes::_dcmpl :
1601 case Bytecodes::_dcmpg :
1602 current_frame.pop_stack_2(
1603 VerificationType::double2_type(),
1604 VerificationType::double_type(), CHECK_VERIFY(this));
1605 current_frame.pop_stack_2(
1606 VerificationType::double2_type(),
1607 VerificationType::double_type(), CHECK_VERIFY(this));
1608 current_frame.push_stack(
1609 VerificationType::integer_type(), CHECK_VERIFY(this));
1610 no_control_flow = false; break;
1611 case Bytecodes::_if_icmpeq:
1612 case Bytecodes::_if_icmpne:
1613 case Bytecodes::_if_icmplt:
1614 case Bytecodes::_if_icmpge:
1615 case Bytecodes::_if_icmpgt:
1616 case Bytecodes::_if_icmple:
1617 current_frame.pop_stack(
1618 VerificationType::integer_type(), CHECK_VERIFY(this));
1619 // fall through
1620 case Bytecodes::_ifeq:
1621 case Bytecodes::_ifne:
1622 case Bytecodes::_iflt:
1623 case Bytecodes::_ifge:
1624 case Bytecodes::_ifgt:
1625 case Bytecodes::_ifle:
1626 current_frame.pop_stack(
1627 VerificationType::integer_type(), CHECK_VERIFY(this));
1628 target = bcs.dest();
1629 stackmap_table.check_jump_target(
1630 ¤t_frame, target, CHECK_VERIFY(this));
1631 no_control_flow = false; break;
1632 case Bytecodes::_if_acmpeq :
1633 case Bytecodes::_if_acmpne :
1634 current_frame.pop_stack(
1635 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
1636 // fall through
1637 case Bytecodes::_ifnull :
1638 case Bytecodes::_ifnonnull :
1639 current_frame.pop_stack(
1640 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
1641 target = bcs.dest();
1642 stackmap_table.check_jump_target
1643 (¤t_frame, target, CHECK_VERIFY(this));
1644 no_control_flow = false; break;
1645 case Bytecodes::_goto :
1646 target = bcs.dest();
1647 stackmap_table.check_jump_target(
1648 ¤t_frame, target, CHECK_VERIFY(this));
1649 no_control_flow = true; break;
1650 case Bytecodes::_goto_w :
1651 target = bcs.dest_w();
1652 stackmap_table.check_jump_target(
1653 ¤t_frame, target, CHECK_VERIFY(this));
1654 no_control_flow = true; break;
1655 case Bytecodes::_tableswitch :
1656 case Bytecodes::_lookupswitch :
1657 verify_switch(
1658 &bcs, code_length, code_data, ¤t_frame,
1659 &stackmap_table, CHECK_VERIFY(this));
1660 no_control_flow = true; break;
1661 case Bytecodes::_ireturn :
1662 type = current_frame.pop_stack(
1663 VerificationType::integer_type(), CHECK_VERIFY(this));
1664 verify_return_value(return_type, type, bci,
1665 ¤t_frame, CHECK_VERIFY(this));
1666 no_control_flow = true; break;
1667 case Bytecodes::_lreturn :
1668 type2 = current_frame.pop_stack(
1669 VerificationType::long2_type(), CHECK_VERIFY(this));
1670 type = current_frame.pop_stack(
1671 VerificationType::long_type(), CHECK_VERIFY(this));
1672 verify_return_value(return_type, type, bci,
1673 ¤t_frame, CHECK_VERIFY(this));
1674 no_control_flow = true; break;
1675 case Bytecodes::_freturn :
1676 type = current_frame.pop_stack(
1677 VerificationType::float_type(), CHECK_VERIFY(this));
1678 verify_return_value(return_type, type, bci,
1679 ¤t_frame, CHECK_VERIFY(this));
1680 no_control_flow = true; break;
1681 case Bytecodes::_dreturn :
1682 type2 = current_frame.pop_stack(
1683 VerificationType::double2_type(), CHECK_VERIFY(this));
1684 type = current_frame.pop_stack(
1685 VerificationType::double_type(), CHECK_VERIFY(this));
1686 verify_return_value(return_type, type, bci,
1687 ¤t_frame, CHECK_VERIFY(this));
1688 no_control_flow = true; break;
1689 case Bytecodes::_areturn :
1690 type = current_frame.pop_stack(
1691 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
1692 verify_return_value(return_type, type, bci,
1693 ¤t_frame, CHECK_VERIFY(this));
1694 no_control_flow = true; break;
1695 case Bytecodes::_return :
1696 if (return_type != VerificationType::bogus_type()) {
1697 verify_error(ErrorContext::bad_code(bci),
1698 "Method expects a return value");
1699 return;
1700 }
1701 // Make sure "this" has been initialized if current method is an
1702 // <init>.
1703 if (_method->is_object_constructor() &&
1704 current_frame.flag_this_uninit()) {
1705 verify_error(ErrorContext::bad_code(bci),
1706 "Constructor must call super() or this() "
1707 "before return");
1708 return;
1709 }
1710 no_control_flow = true; break;
1711 case Bytecodes::_getstatic :
1712 case Bytecodes::_putstatic :
1713 // pass TRUE, operand can be an array type for getstatic/putstatic.
1714 verify_field_instructions(
1715 &bcs, ¤t_frame, cp, true, CHECK_VERIFY(this));
1716 no_control_flow = false; break;
1717 case Bytecodes::_getfield :
1718 case Bytecodes::_putfield :
1719 // pass FALSE, operand can't be an array type for getfield/putfield.
1720 verify_field_instructions(
1721 &bcs, ¤t_frame, cp, false, CHECK_VERIFY(this));
1722 no_control_flow = false; break;
1723 case Bytecodes::_invokevirtual :
1724 case Bytecodes::_invokespecial :
1725 case Bytecodes::_invokestatic :
1726 case Bytecodes::_invokeinterface :
1727 case Bytecodes::_invokedynamic :
1728 verify_invoke_instructions(
1729 &bcs, code_length, ¤t_frame, (bci >= ex_min && bci < ex_max),
1730 &this_uninit, cp, &stackmap_table, CHECK_VERIFY(this));
1731 no_control_flow = false; break;
1732 case Bytecodes::_new :
1733 {
1734 u2 index = bcs.get_index_u2();
1735 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1736 VerificationType new_class_type =
1737 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1738 if (!new_class_type.is_object()) {
1739 verify_error(ErrorContext::bad_type(bci,
1740 TypeOrigin::cp(index, new_class_type)),
1741 "Illegal new instruction");
1742 return;
1743 }
1744 type = VerificationType::uninitialized_type(checked_cast<u2>(bci));
1745 current_frame.push_stack(type, CHECK_VERIFY(this));
1746 no_control_flow = false; break;
1747 }
1748 case Bytecodes::_newarray :
1749 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1750 current_frame.pop_stack(
1751 VerificationType::integer_type(), CHECK_VERIFY(this));
1752 current_frame.push_stack(type, CHECK_VERIFY(this));
1753 no_control_flow = false; break;
1754 case Bytecodes::_anewarray :
1755 verify_anewarray(
1756 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1757 no_control_flow = false; break;
1758 case Bytecodes::_arraylength :
1759 type = current_frame.pop_stack(
1760 VerificationType::reference_check(), CHECK_VERIFY(this));
1761 if (!(type.is_null() || type.is_array())) {
1762 verify_error(ErrorContext::bad_type(
1763 bci, current_frame.stack_top_ctx()),
1764 bad_type_msg, "arraylength");
1765 }
1766 current_frame.push_stack(
1767 VerificationType::integer_type(), CHECK_VERIFY(this));
1768 no_control_flow = false; break;
1769 case Bytecodes::_checkcast :
1770 {
1771 u2 index = bcs.get_index_u2();
1772 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1773 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1774 VerificationType klass_type = cp_index_to_type(
1775 index, cp, CHECK_VERIFY(this));
1776 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1777 no_control_flow = false; break;
1778 }
1779 case Bytecodes::_instanceof : {
1780 u2 index = bcs.get_index_u2();
1781 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1782 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1783 current_frame.push_stack(
1784 VerificationType::integer_type(), CHECK_VERIFY(this));
1785 no_control_flow = false; break;
1786 }
1787 case Bytecodes::_monitorenter :
1788 case Bytecodes::_monitorexit : {
1789 VerificationType ref = current_frame.pop_stack(
1790 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
1791 no_control_flow = false; break;
1792 }
1793 case Bytecodes::_multianewarray :
1794 {
1795 u2 index = bcs.get_index_u2();
1796 u2 dim = *(bcs.bcp()+3);
1797 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1798 VerificationType new_array_type =
1799 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1800 if (!new_array_type.is_array()) {
1801 verify_error(ErrorContext::bad_type(bci,
1802 TypeOrigin::cp(index, new_array_type)),
1803 "Illegal constant pool index in multianewarray instruction");
1804 return;
1805 }
1806 if (dim < 1 || new_array_type.dimensions() < dim) {
1807 verify_error(ErrorContext::bad_code(bci),
1808 "Illegal dimension in multianewarray instruction: %d", dim);
1809 return;
1810 }
1811 for (int i = 0; i < dim; i++) {
1812 current_frame.pop_stack(
1813 VerificationType::integer_type(), CHECK_VERIFY(this));
1814 }
1815 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1816 no_control_flow = false; break;
1817 }
1818 case Bytecodes::_athrow :
1819 type = VerificationType::reference_type(
1820 vmSymbols::java_lang_Throwable());
1821 current_frame.pop_stack(type, CHECK_VERIFY(this));
1822 no_control_flow = true; break;
1823 default:
1824 // We only need to check the valid bytecodes in class file.
1825 // And jsr and ret are not in the new class file format in JDK1.6.
1826 verify_error(ErrorContext::bad_code(bci),
1827 "Bad instruction: %02x", opcode);
1828 no_control_flow = false;
1829 return;
1830 } // end switch
1831 } // end Merge with the next instruction
1832
1833 // Look for possible jump target in exception handlers and see if it matches
1834 // current_frame. Don't do this check if it has already been done (for
1835 // ([a,d,f,i,l]store* opcodes). This check cannot be done earlier because
1836 // opcodes, such as invokespecial, may set the this_uninit flag.
1837 assert(!(verified_exc_handlers && this_uninit),
1838 "Exception handler targets got verified before this_uninit got set");
1839 if (!verified_exc_handlers && bci >= ex_min && bci < ex_max) {
1840 if (was_recursively_verified()) return;
1841 verify_exception_handler_targets(
1842 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1843 }
1844 } // end while
1845
1846 // Make sure that control flow does not fall through end of the method
1847 if (!no_control_flow) {
1848 verify_error(ErrorContext::bad_code(code_length),
1849 "Control flow falls through code end");
1850 return;
1851 }
1852 }
1853
1854 #undef bad_type_message
1855
1856 char* ClassVerifier::generate_code_data(const methodHandle& m, u4 code_length, TRAPS) {
1857 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1858 memset(code_data, 0, sizeof(char) * code_length);
1859 RawBytecodeStream bcs(m);
1860
1861 while (!bcs.is_last_bytecode()) {
1862 if (bcs.raw_next() != Bytecodes::_illegal) {
1863 int bci = bcs.bci();
1864 if (bcs.raw_code() == Bytecodes::_new) {
1865 code_data[bci] = NEW_OFFSET;
1866 } else {
1867 code_data[bci] = BYTECODE_OFFSET;
1868 }
1869 } else {
1870 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1871 return nullptr;
1872 }
1873 }
1874
1875 return code_data;
1876 }
1877
1878 // Since this method references the constant pool, call was_recursively_verified()
1879 // before calling this method to make sure a prior class load did not cause the
1880 // current class to get verified.
1881 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1882 ExceptionTable exhandlers(_method());
1883 int exlength = exhandlers.length();
1884 constantPoolHandle cp (THREAD, _method->constants());
1885
1886 for(int i = 0; i < exlength; i++) {
1887 u2 start_pc = exhandlers.start_pc(i);
1888 u2 end_pc = exhandlers.end_pc(i);
1889 u2 handler_pc = exhandlers.handler_pc(i);
1890 if (start_pc >= code_length || code_data[start_pc] == 0) {
1891 class_format_error("Illegal exception table start_pc %d", start_pc);
1892 return;
1893 }
1894 if (end_pc != code_length) { // special case: end_pc == code_length
1895 if (end_pc > code_length || code_data[end_pc] == 0) {
1896 class_format_error("Illegal exception table end_pc %d", end_pc);
1897 return;
1898 }
1899 }
1900 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1901 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1902 return;
1903 }
1904 u2 catch_type_index = exhandlers.catch_type_index(i);
1905 if (catch_type_index != 0) {
1906 VerificationType catch_type = cp_index_to_type(
1907 catch_type_index, cp, CHECK_VERIFY(this));
1908 VerificationType throwable =
1909 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1910 // If the catch type is Throwable pre-resolve it now as the assignable check won't
1911 // do that, and we need to avoid a runtime resolution in case we are trying to
1912 // catch OutOfMemoryError.
1913 if (cp->klass_name_at(catch_type_index) == vmSymbols::java_lang_Throwable()) {
1914 cp->klass_at(catch_type_index, CHECK);
1915 }
1916 bool is_subclass = throwable.is_assignable_from(
1917 catch_type, this, false, CHECK_VERIFY(this));
1918 if (!is_subclass) {
1919 // 4286534: should throw VerifyError according to recent spec change
1920 verify_error(ErrorContext::bad_type(handler_pc,
1921 TypeOrigin::cp(catch_type_index, catch_type),
1922 TypeOrigin::implicit(throwable)),
1923 "Catch type is not a subclass "
1924 "of Throwable in exception handler %d", handler_pc);
1925 return;
1926 }
1927 }
1928 if (start_pc < min) min = start_pc;
1929 if (end_pc > max) max = end_pc;
1930 }
1931 }
1932
1933 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1934 int localvariable_table_length = _method->localvariable_table_length();
1935 if (localvariable_table_length > 0) {
1936 LocalVariableTableElement* table = _method->localvariable_table_start();
1937 for (int i = 0; i < localvariable_table_length; i++) {
1938 u2 start_bci = table[i].start_bci;
1939 u2 length = table[i].length;
1940
1941 if (start_bci >= code_length || code_data[start_bci] == 0) {
1942 class_format_error(
1943 "Illegal local variable table start_pc %d", start_bci);
1944 return;
1945 }
1946 u4 end_bci = (u4)(start_bci + length);
1947 if (end_bci != code_length) {
1948 if (end_bci >= code_length || code_data[end_bci] == 0) {
1949 class_format_error( "Illegal local variable table length %d", length);
1950 return;
1951 }
1952 }
1953 }
1954 }
1955 }
1956
1957 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, int bci,
1958 StackMapFrame* current_frame,
1959 StackMapTable* stackmap_table,
1960 bool no_control_flow, TRAPS) {
1961 if (stackmap_index < stackmap_table->get_frame_count()) {
1962 int this_offset = stackmap_table->get_offset(stackmap_index);
1963 if (no_control_flow && this_offset > bci) {
1964 verify_error(ErrorContext::missing_stackmap(bci),
1965 "Expecting a stack map frame");
1966 return 0;
1967 }
1968 if (this_offset == bci) {
1969 ErrorContext ctx;
1970 // See if current stack map can be assigned to the frame in table.
1971 // current_frame is the stackmap frame got from the last instruction.
1972 // If matched, current_frame will be updated by this method.
1973 bool matches = stackmap_table->match_stackmap(
1974 current_frame, this_offset, stackmap_index,
1975 !no_control_flow, true, &ctx, CHECK_VERIFY_(this, 0));
1976 if (!matches) {
1977 // report type error
1978 verify_error(ctx, "Instruction type does not match stack map");
1979 return 0;
1980 }
1981 stackmap_index++;
1982 } else if (this_offset < bci) {
1983 // current_offset should have met this_offset.
1984 class_format_error("Bad stack map offset %d", this_offset);
1985 return 0;
1986 }
1987 } else if (no_control_flow) {
1988 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1989 return 0;
1990 }
1991 return stackmap_index;
1992 }
1993
1994 // Since this method references the constant pool, call was_recursively_verified()
1995 // before calling this method to make sure a prior class load did not cause the
1996 // current class to get verified.
1997 void ClassVerifier::verify_exception_handler_targets(int bci, bool this_uninit,
1998 StackMapFrame* current_frame,
1999 StackMapTable* stackmap_table, TRAPS) {
2000 constantPoolHandle cp (THREAD, _method->constants());
2001 ExceptionTable exhandlers(_method());
2002 int exlength = exhandlers.length();
2003 for(int i = 0; i < exlength; i++) {
2004 u2 start_pc = exhandlers.start_pc(i);
2005 u2 end_pc = exhandlers.end_pc(i);
2006 u2 handler_pc = exhandlers.handler_pc(i);
2007 int catch_type_index = exhandlers.catch_type_index(i);
2008 if(bci >= start_pc && bci < end_pc) {
2009 u1 flags = current_frame->flags();
2010 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
2011 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
2012 if (catch_type_index != 0) {
2013 if (was_recursively_verified()) return;
2014 // We know that this index refers to a subclass of Throwable
2015 VerificationType catch_type = cp_index_to_type(
2016 catch_type_index, cp, CHECK_VERIFY(this));
2017 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
2018 } else {
2019 VerificationType throwable =
2020 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
2021 new_frame->push_stack(throwable, CHECK_VERIFY(this));
2022 }
2023 ErrorContext ctx;
2024 bool matches = stackmap_table->match_stackmap(
2025 new_frame, handler_pc, true, false, &ctx, CHECK_VERIFY(this));
2026 if (!matches) {
2027 verify_error(ctx, "Stack map does not match the one at "
2028 "exception handler %d", handler_pc);
2029 return;
2030 }
2031 }
2032 }
2033 }
2034
2035 void ClassVerifier::verify_cp_index(
2036 int bci, const constantPoolHandle& cp, u2 index, TRAPS) {
2037 int nconstants = cp->length();
2038 if ((index <= 0) || (index >= nconstants)) {
2039 verify_error(ErrorContext::bad_cp_index(bci, index),
2040 "Illegal constant pool index %d in class %s",
2041 index, cp->pool_holder()->external_name());
2042 return;
2043 }
2044 }
2045
2046 void ClassVerifier::verify_cp_type(
2047 int bci, u2 index, const constantPoolHandle& cp, unsigned int types, TRAPS) {
2048
2049 // In some situations, bytecode rewriting may occur while we're verifying.
2050 // In this case, a constant pool cache exists and some indices refer to that
2051 // instead. Be sure we don't pick up such indices by accident.
2052 // We must check was_recursively_verified() before we get here.
2053 guarantee(cp->cache() == nullptr, "not rewritten yet");
2054
2055 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
2056 unsigned int tag = cp->tag_at(index).value();
2057
2058 if ((types & (1 << tag)) == 0) {
2059 verify_error(ErrorContext::bad_cp_index(bci, index),
2060 "Illegal type at constant pool entry %d in class %s",
2061 index, cp->pool_holder()->external_name());
2062 return;
2063 }
2064 }
2065
2066 void ClassVerifier::verify_cp_class_type(
2067 int bci, u2 index, const constantPoolHandle& cp, TRAPS) {
2068 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
2069 constantTag tag = cp->tag_at(index);
2070 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2071 verify_error(ErrorContext::bad_cp_index(bci, index),
2072 "Illegal type at constant pool entry %d in class %s",
2073 index, cp->pool_holder()->external_name());
2074 return;
2075 }
2076 }
2077
2078 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
2079 stringStream ss;
2080
2081 ctx.reset_frames();
2082 _exception_type = vmSymbols::java_lang_VerifyError();
2083 _error_context = ctx;
2084 va_list va;
2085 va_start(va, msg);
2086 ss.vprint(msg, va);
2087 va_end(va);
2088 _message = ss.as_string();
2089 #ifdef ASSERT
2090 ResourceMark rm;
2091 const char* exception_name = _exception_type->as_C_string();
2092 Exceptions::debug_check_abort(exception_name, nullptr);
2093 #endif // ndef ASSERT
2094 }
2095
2096 void ClassVerifier::class_format_error(const char* msg, ...) {
2097 stringStream ss;
2098 _exception_type = vmSymbols::java_lang_ClassFormatError();
2099 va_list va;
2100 va_start(va, msg);
2101 ss.vprint(msg, va);
2102 va_end(va);
2103 if (!_method.is_null()) {
2104 ss.print(" in method '");
2105 _method->print_external_name(&ss);
2106 ss.print("'");
2107 }
2108 _message = ss.as_string();
2109 }
2110
2111 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
2112 HandleMark hm(THREAD);
2113 // Get current loader and protection domain first.
2114 oop loader = current_class()->class_loader();
2115 oop protection_domain = current_class()->protection_domain();
2116
2117 assert(name_in_supers(name, current_class()), "name should be a super class");
2118
2119 Klass* kls = SystemDictionary::resolve_or_fail(
2120 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
2121 true, THREAD);
2122
2123 if (kls != nullptr) {
2124 if (log_is_enabled(Debug, class, resolve)) {
2125 Verifier::trace_class_resolution(kls, current_class());
2126 }
2127 }
2128 return kls;
2129 }
2130
2131 bool ClassVerifier::is_protected_access(InstanceKlass* this_class,
2132 Klass* target_class,
2133 Symbol* field_name,
2134 Symbol* field_sig,
2135 bool is_method) {
2136 NoSafepointVerifier nosafepoint;
2137
2138 // If target class isn't a super class of this class, we don't worry about this case
2139 if (!this_class->is_subclass_of(target_class)) {
2140 return false;
2141 }
2142 // Check if the specified method or field is protected
2143 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
2144 fieldDescriptor fd;
2145 if (is_method) {
2146 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::OverpassLookupMode::find);
2147 if (m != nullptr && m->is_protected()) {
2148 if (!this_class->is_same_class_package(m->method_holder())) {
2149 return true;
2150 }
2151 }
2152 } else {
2153 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
2154 if (member_klass != nullptr && fd.is_protected()) {
2155 if (!this_class->is_same_class_package(member_klass)) {
2156 return true;
2157 }
2158 }
2159 }
2160 return false;
2161 }
2162
2163 void ClassVerifier::verify_ldc(
2164 int opcode, u2 index, StackMapFrame* current_frame,
2165 const constantPoolHandle& cp, int bci, TRAPS) {
2166 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
2167 constantTag tag = cp->tag_at(index);
2168 unsigned int types = 0;
2169 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
2170 if (!tag.is_unresolved_klass()) {
2171 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
2172 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
2173 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType)
2174 | (1 << JVM_CONSTANT_Dynamic);
2175 // Note: The class file parser already verified the legality of
2176 // MethodHandle and MethodType constants.
2177 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2178 }
2179 } else {
2180 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
2181 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long)
2182 | (1 << JVM_CONSTANT_Dynamic);
2183 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2184 }
2185 if (tag.is_string()) {
2186 current_frame->push_stack(
2187 VerificationType::reference_type(
2188 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
2189 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
2190 current_frame->push_stack(
2191 VerificationType::reference_type(
2192 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
2193 } else if (tag.is_int()) {
2194 current_frame->push_stack(
2195 VerificationType::integer_type(), CHECK_VERIFY(this));
2196 } else if (tag.is_float()) {
2197 current_frame->push_stack(
2198 VerificationType::float_type(), CHECK_VERIFY(this));
2199 } else if (tag.is_double()) {
2200 current_frame->push_stack_2(
2201 VerificationType::double_type(),
2202 VerificationType::double2_type(), CHECK_VERIFY(this));
2203 } else if (tag.is_long()) {
2204 current_frame->push_stack_2(
2205 VerificationType::long_type(),
2206 VerificationType::long2_type(), CHECK_VERIFY(this));
2207 } else if (tag.is_method_handle()) {
2208 current_frame->push_stack(
2209 VerificationType::reference_type(
2210 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2211 } else if (tag.is_method_type()) {
2212 current_frame->push_stack(
2213 VerificationType::reference_type(
2214 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2215 } else if (tag.is_dynamic_constant()) {
2216 Symbol* constant_type = cp->uncached_signature_ref_at(index);
2217 // Field signature was checked in ClassFileParser.
2218 assert(SignatureVerifier::is_valid_type_signature(constant_type),
2219 "Invalid type for dynamic constant");
2220 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2221 "buffer type must match VerificationType size");
2222 uintptr_t constant_type_buffer[2];
2223 VerificationType* v_constant_type = (VerificationType*)constant_type_buffer;
2224 SignatureStream sig_stream(constant_type, false);
2225 int n = change_sig_to_verificationType(&sig_stream, v_constant_type);
2226 int opcode_n = (opcode == Bytecodes::_ldc2_w ? 2 : 1);
2227 if (n != opcode_n) {
2228 // wrong kind of ldc; reverify against updated type mask
2229 types &= ~(1 << JVM_CONSTANT_Dynamic);
2230 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2231 }
2232 for (int i = 0; i < n; i++) {
2233 current_frame->push_stack(v_constant_type[i], CHECK_VERIFY(this));
2234 }
2235 } else {
2236 /* Unreachable? verify_cp_type has already validated the cp type. */
2237 verify_error(
2238 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2239 return;
2240 }
2241 }
2242
2243 void ClassVerifier::verify_switch(
2244 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2245 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2246 int bci = bcs->bci();
2247 address bcp = bcs->bcp();
2248 address aligned_bcp = align_up(bcp + 1, jintSize);
2249
2250 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2251 // 4639449 & 4647081: padding bytes must be 0
2252 u2 padding_offset = 1;
2253 while ((bcp + padding_offset) < aligned_bcp) {
2254 if(*(bcp + padding_offset) != 0) {
2255 verify_error(ErrorContext::bad_code(bci),
2256 "Nonzero padding byte in lookupswitch or tableswitch");
2257 return;
2258 }
2259 padding_offset++;
2260 }
2261 }
2262
2263 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2264 int keys, delta;
2265 current_frame->pop_stack(
2266 VerificationType::integer_type(), CHECK_VERIFY(this));
2267 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2268 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2269 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2270 if (low > high) {
2271 verify_error(ErrorContext::bad_code(bci),
2272 "low must be less than or equal to high in tableswitch");
2273 return;
2274 }
2275 keys = high - low + 1;
2276 if (keys < 0) {
2277 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2278 return;
2279 }
2280 delta = 1;
2281 } else {
2282 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2283 if (keys < 0) {
2284 verify_error(ErrorContext::bad_code(bci),
2285 "number of keys in lookupswitch less than 0");
2286 return;
2287 }
2288 delta = 2;
2289 // Make sure that the lookupswitch items are sorted
2290 for (int i = 0; i < (keys - 1); i++) {
2291 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2292 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2293 if (this_key >= next_key) {
2294 verify_error(ErrorContext::bad_code(bci),
2295 "Bad lookupswitch instruction");
2296 return;
2297 }
2298 }
2299 }
2300 int target = bci + default_offset;
2301 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2302 for (int i = 0; i < keys; i++) {
2303 // Because check_jump_target() may safepoint, the bytecode could have
2304 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2305 aligned_bcp = align_up(bcs->bcp() + 1, jintSize);
2306 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2307 stackmap_table->check_jump_target(
2308 current_frame, target, CHECK_VERIFY(this));
2309 }
2310 NOT_PRODUCT(aligned_bcp = nullptr); // no longer valid at this point
2311 }
2312
2313 bool ClassVerifier::name_in_supers(
2314 Symbol* ref_name, InstanceKlass* current) {
2315 Klass* super = current->super();
2316 while (super != nullptr) {
2317 if (super->name() == ref_name) {
2318 return true;
2319 }
2320 super = super->super();
2321 }
2322 return false;
2323 }
2324
2325 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2326 StackMapFrame* current_frame,
2327 const constantPoolHandle& cp,
2328 bool allow_arrays,
2329 TRAPS) {
2330 u2 index = bcs->get_index_u2();
2331 verify_cp_type(bcs->bci(), index, cp,
2332 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2333
2334 // Get field name and signature
2335 Symbol* field_name = cp->uncached_name_ref_at(index);
2336 Symbol* field_sig = cp->uncached_signature_ref_at(index);
2337 bool is_getfield = false;
2338
2339 // Field signature was checked in ClassFileParser.
2340 assert(SignatureVerifier::is_valid_type_signature(field_sig),
2341 "Invalid field signature");
2342
2343 // Get referenced class type
2344 VerificationType ref_class_type = cp_ref_index_to_type(
2345 index, cp, CHECK_VERIFY(this));
2346 if (!ref_class_type.is_object() &&
2347 (!allow_arrays || !ref_class_type.is_array())) {
2348 verify_error(ErrorContext::bad_type(bcs->bci(),
2349 TypeOrigin::cp(index, ref_class_type)),
2350 "Expecting reference to class in class %s at constant pool index %d",
2351 _klass->external_name(), index);
2352 return;
2353 }
2354
2355 VerificationType target_class_type = ref_class_type;
2356
2357 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2358 "buffer type must match VerificationType size");
2359 uintptr_t field_type_buffer[2];
2360 VerificationType* field_type = (VerificationType*)field_type_buffer;
2361 // If we make a VerificationType[2] array directly, the compiler calls
2362 // to the c-runtime library to do the allocation instead of just
2363 // stack allocating it. Plus it would run constructors. This shows up
2364 // in performance profiles.
2365
2366 SignatureStream sig_stream(field_sig, false);
2367 VerificationType stack_object_type;
2368 int n = change_sig_to_verificationType(&sig_stream, field_type);
2369 int bci = bcs->bci();
2370 bool is_assignable;
2371 switch (bcs->raw_code()) {
2372 case Bytecodes::_getstatic: {
2373 for (int i = 0; i < n; i++) {
2374 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2375 }
2376 break;
2377 }
2378 case Bytecodes::_putstatic: {
2379 for (int i = n - 1; i >= 0; i--) {
2380 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2381 }
2382 break;
2383 }
2384 case Bytecodes::_getfield: {
2385 is_getfield = true;
2386 stack_object_type = current_frame->pop_stack(
2387 target_class_type, CHECK_VERIFY(this));
2388 goto check_protected;
2389 }
2390 case Bytecodes::_putfield: {
2391 for (int i = n - 1; i >= 0; i--) {
2392 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2393 }
2394 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2395
2396 // The JVMS 2nd edition allows field initialization before the superclass
2397 // initializer, if the field is defined within the current class.
2398 fieldDescriptor fd;
2399 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2400 target_class_type.equals(current_type()) &&
2401 _klass->find_local_field(field_name, field_sig, &fd)) {
2402 stack_object_type = current_type();
2403 }
2404 is_assignable = target_class_type.is_assignable_from(
2405 stack_object_type, this, false, CHECK_VERIFY(this));
2406 if (!is_assignable) {
2407 verify_error(ErrorContext::bad_type(bci,
2408 current_frame->stack_top_ctx(),
2409 TypeOrigin::cp(index, target_class_type)),
2410 "Bad type on operand stack in putfield");
2411 return;
2412 }
2413 }
2414 check_protected: {
2415 if (_this_type == stack_object_type)
2416 break; // stack_object_type must be assignable to _current_class_type
2417 if (was_recursively_verified()) {
2418 if (is_getfield) {
2419 // Push field type for getfield.
2420 for (int i = 0; i < n; i++) {
2421 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2422 }
2423 }
2424 return;
2425 }
2426 Symbol* ref_class_name =
2427 cp->klass_name_at(cp->uncached_klass_ref_index_at(index));
2428 if (!name_in_supers(ref_class_name, current_class()))
2429 // stack_object_type must be assignable to _current_class_type since:
2430 // 1. stack_object_type must be assignable to ref_class.
2431 // 2. ref_class must be _current_class or a subclass of it. It can't
2432 // be a superclass of it. See revised JVMS 5.4.4.
2433 break;
2434
2435 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2436 if (is_protected_access(current_class(), ref_class_oop, field_name,
2437 field_sig, false)) {
2438 // It's protected access, check if stack object is assignable to
2439 // current class.
2440 is_assignable = current_type().is_assignable_from(
2441 stack_object_type, this, true, CHECK_VERIFY(this));
2442 if (!is_assignable) {
2443 verify_error(ErrorContext::bad_type(bci,
2444 current_frame->stack_top_ctx(),
2445 TypeOrigin::implicit(current_type())),
2446 "Bad access to protected data in %s",
2447 is_getfield ? "getfield" : "putfield");
2448 return;
2449 }
2450 }
2451 break;
2452 }
2453 default: ShouldNotReachHere();
2454 }
2455 if (is_getfield) {
2456 // Push field type for getfield after doing protection check.
2457 for (int i = 0; i < n; i++) {
2458 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2459 }
2460 }
2461 }
2462
2463 // Look at the method's handlers. If the bci is in the handler's try block
2464 // then check if the handler_pc is already on the stack. If not, push it
2465 // unless the handler has already been scanned.
2466 void ClassVerifier::push_handlers(ExceptionTable* exhandlers,
2467 GrowableArray<u4>* handler_list,
2468 GrowableArray<u4>* handler_stack,
2469 u4 bci) {
2470 int exlength = exhandlers->length();
2471 for(int x = 0; x < exlength; x++) {
2472 if (bci >= exhandlers->start_pc(x) && bci < exhandlers->end_pc(x)) {
2473 u4 exhandler_pc = exhandlers->handler_pc(x);
2474 if (!handler_list->contains(exhandler_pc)) {
2475 handler_stack->append_if_missing(exhandler_pc);
2476 handler_list->append(exhandler_pc);
2477 }
2478 }
2479 }
2480 }
2481
2482 // Return TRUE if all code paths starting with start_bc_offset end in
2483 // bytecode athrow or loop.
2484 bool ClassVerifier::ends_in_athrow(u4 start_bc_offset) {
2485 ResourceMark rm;
2486 // Create bytecode stream.
2487 RawBytecodeStream bcs(method());
2488 int code_length = method()->code_size();
2489 bcs.set_start(start_bc_offset);
2490
2491 // Create stack for storing bytecode start offsets for if* and *switch.
2492 GrowableArray<u4>* bci_stack = new GrowableArray<u4>(30);
2493 // Create stack for handlers for try blocks containing this handler.
2494 GrowableArray<u4>* handler_stack = new GrowableArray<u4>(30);
2495 // Create list of handlers that have been pushed onto the handler_stack
2496 // so that handlers embedded inside of their own TRY blocks only get
2497 // scanned once.
2498 GrowableArray<u4>* handler_list = new GrowableArray<u4>(30);
2499 // Create list of visited branch opcodes (goto* and if*).
2500 GrowableArray<u4>* visited_branches = new GrowableArray<u4>(30);
2501 ExceptionTable exhandlers(_method());
2502
2503 while (true) {
2504 if (bcs.is_last_bytecode()) {
2505 // if no more starting offsets to parse or if at the end of the
2506 // method then return false.
2507 if ((bci_stack->is_empty()) || (bcs.end_bci() == code_length))
2508 return false;
2509 // Pop a bytecode starting offset and scan from there.
2510 bcs.set_start(bci_stack->pop());
2511 }
2512 Bytecodes::Code opcode = bcs.raw_next();
2513 int bci = bcs.bci();
2514
2515 // If the bytecode is in a TRY block, push its handlers so they
2516 // will get parsed.
2517 push_handlers(&exhandlers, handler_list, handler_stack, bci);
2518
2519 switch (opcode) {
2520 case Bytecodes::_if_icmpeq:
2521 case Bytecodes::_if_icmpne:
2522 case Bytecodes::_if_icmplt:
2523 case Bytecodes::_if_icmpge:
2524 case Bytecodes::_if_icmpgt:
2525 case Bytecodes::_if_icmple:
2526 case Bytecodes::_ifeq:
2527 case Bytecodes::_ifne:
2528 case Bytecodes::_iflt:
2529 case Bytecodes::_ifge:
2530 case Bytecodes::_ifgt:
2531 case Bytecodes::_ifle:
2532 case Bytecodes::_if_acmpeq:
2533 case Bytecodes::_if_acmpne:
2534 case Bytecodes::_ifnull:
2535 case Bytecodes::_ifnonnull: {
2536 int target = bcs.dest();
2537 if (visited_branches->contains(bci)) {
2538 if (bci_stack->is_empty()) {
2539 if (handler_stack->is_empty()) {
2540 return true;
2541 } else {
2542 // Parse the catch handlers for try blocks containing athrow.
2543 bcs.set_start(handler_stack->pop());
2544 }
2545 } else {
2546 // Pop a bytecode starting offset and scan from there.
2547 bcs.set_start(bci_stack->pop());
2548 }
2549 } else {
2550 if (target > bci) { // forward branch
2551 if (target >= code_length) return false;
2552 // Push the branch target onto the stack.
2553 bci_stack->push(target);
2554 // then, scan bytecodes starting with next.
2555 bcs.set_start(bcs.next_bci());
2556 } else { // backward branch
2557 // Push bytecode offset following backward branch onto the stack.
2558 bci_stack->push(bcs.next_bci());
2559 // Check bytecodes starting with branch target.
2560 bcs.set_start(target);
2561 }
2562 // Record target so we don't branch here again.
2563 visited_branches->append(bci);
2564 }
2565 break;
2566 }
2567
2568 case Bytecodes::_goto:
2569 case Bytecodes::_goto_w: {
2570 int target = (opcode == Bytecodes::_goto ? bcs.dest() : bcs.dest_w());
2571 if (visited_branches->contains(bci)) {
2572 if (bci_stack->is_empty()) {
2573 if (handler_stack->is_empty()) {
2574 return true;
2575 } else {
2576 // Parse the catch handlers for try blocks containing athrow.
2577 bcs.set_start(handler_stack->pop());
2578 }
2579 } else {
2580 // Been here before, pop new starting offset from stack.
2581 bcs.set_start(bci_stack->pop());
2582 }
2583 } else {
2584 if (target >= code_length) return false;
2585 // Continue scanning from the target onward.
2586 bcs.set_start(target);
2587 // Record target so we don't branch here again.
2588 visited_branches->append(bci);
2589 }
2590 break;
2591 }
2592
2593 // Check that all switch alternatives end in 'athrow' bytecodes. Since it
2594 // is difficult to determine where each switch alternative ends, parse
2595 // each switch alternative until either hit a 'return', 'athrow', or reach
2596 // the end of the method's bytecodes. This is gross but should be okay
2597 // because:
2598 // 1. tableswitch and lookupswitch byte codes in handlers for ctor explicit
2599 // constructor invocations should be rare.
2600 // 2. if each switch alternative ends in an athrow then the parsing should be
2601 // short. If there is no athrow then it is bogus code, anyway.
2602 case Bytecodes::_lookupswitch:
2603 case Bytecodes::_tableswitch:
2604 {
2605 address aligned_bcp = align_up(bcs.bcp() + 1, jintSize);
2606 int default_offset = Bytes::get_Java_u4(aligned_bcp) + bci;
2607 int keys, delta;
2608 if (opcode == Bytecodes::_tableswitch) {
2609 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2610 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2611 // This is invalid, but let the regular bytecode verifier
2612 // report this because the user will get a better error message.
2613 if (low > high) return true;
2614 keys = high - low + 1;
2615 delta = 1;
2616 } else {
2617 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2618 delta = 2;
2619 }
2620 // Invalid, let the regular bytecode verifier deal with it.
2621 if (keys < 0) return true;
2622
2623 // Push the offset of the next bytecode onto the stack.
2624 bci_stack->push(bcs.next_bci());
2625
2626 // Push the switch alternatives onto the stack.
2627 for (int i = 0; i < keys; i++) {
2628 int target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2629 if (target > code_length) return false;
2630 bci_stack->push(target);
2631 }
2632
2633 // Start bytecode parsing for the switch at the default alternative.
2634 if (default_offset > code_length) return false;
2635 bcs.set_start(default_offset);
2636 break;
2637 }
2638
2639 case Bytecodes::_return:
2640 return false;
2641
2642 case Bytecodes::_athrow:
2643 {
2644 if (bci_stack->is_empty()) {
2645 if (handler_stack->is_empty()) {
2646 return true;
2647 } else {
2648 // Parse the catch handlers for try blocks containing athrow.
2649 bcs.set_start(handler_stack->pop());
2650 }
2651 } else {
2652 // Pop a bytecode offset and starting scanning from there.
2653 bcs.set_start(bci_stack->pop());
2654 }
2655 }
2656 break;
2657
2658 default:
2659 ;
2660 } // end switch
2661 } // end while loop
2662
2663 return false;
2664 }
2665
2666 void ClassVerifier::verify_invoke_init(
2667 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2668 StackMapFrame* current_frame, u4 code_length, bool in_try_block,
2669 bool *this_uninit, const constantPoolHandle& cp, StackMapTable* stackmap_table,
2670 TRAPS) {
2671 int bci = bcs->bci();
2672 VerificationType type = current_frame->pop_stack(
2673 VerificationType::reference_check(), CHECK_VERIFY(this));
2674 if (type == VerificationType::uninitialized_this_type()) {
2675 // The method must be an <init> method of this class or its superclass
2676 Klass* superk = current_class()->super();
2677 if (ref_class_type.name() != current_class()->name() &&
2678 ref_class_type.name() != superk->name()) {
2679 verify_error(ErrorContext::bad_type(bci,
2680 TypeOrigin::implicit(ref_class_type),
2681 TypeOrigin::implicit(current_type())),
2682 "Bad <init> method call");
2683 return;
2684 }
2685
2686 // If this invokespecial call is done from inside of a TRY block then make
2687 // sure that all catch clause paths end in a throw. Otherwise, this can
2688 // result in returning an incomplete object.
2689 if (in_try_block) {
2690 ExceptionTable exhandlers(_method());
2691 int exlength = exhandlers.length();
2692 for(int i = 0; i < exlength; i++) {
2693 u2 start_pc = exhandlers.start_pc(i);
2694 u2 end_pc = exhandlers.end_pc(i);
2695
2696 if (bci >= start_pc && bci < end_pc) {
2697 if (!ends_in_athrow(exhandlers.handler_pc(i))) {
2698 verify_error(ErrorContext::bad_code(bci),
2699 "Bad <init> method call from after the start of a try block");
2700 return;
2701 } else if (log_is_enabled(Debug, verification)) {
2702 ResourceMark rm(THREAD);
2703 log_debug(verification)("Survived call to ends_in_athrow(): %s",
2704 current_class()->name()->as_C_string());
2705 }
2706 }
2707 }
2708
2709 // Check the exception handler target stackmaps with the locals from the
2710 // incoming stackmap (before initialize_object() changes them to outgoing
2711 // state).
2712 if (was_recursively_verified()) return;
2713 verify_exception_handler_targets(bci, true, current_frame,
2714 stackmap_table, CHECK_VERIFY(this));
2715 } // in_try_block
2716
2717 current_frame->initialize_object(type, current_type());
2718 *this_uninit = true;
2719 } else if (type.is_uninitialized()) {
2720 u2 new_offset = type.bci();
2721 address new_bcp = bcs->bcp() - bci + new_offset;
2722 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2723 /* Unreachable? Stack map parsing ensures valid type and new
2724 * instructions have a valid BCI. */
2725 verify_error(ErrorContext::bad_code(new_offset),
2726 "Expecting new instruction");
2727 return;
2728 }
2729 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2730 if (was_recursively_verified()) return;
2731 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2732
2733 // The method must be an <init> method of the indicated class
2734 VerificationType new_class_type = cp_index_to_type(
2735 new_class_index, cp, CHECK_VERIFY(this));
2736 if (!new_class_type.equals(ref_class_type)) {
2737 verify_error(ErrorContext::bad_type(bci,
2738 TypeOrigin::cp(new_class_index, new_class_type),
2739 TypeOrigin::cp(ref_class_index, ref_class_type)),
2740 "Call to wrong <init> method");
2741 return;
2742 }
2743 // According to the VM spec, if the referent class is a superclass of the
2744 // current class, and is in a different runtime package, and the method is
2745 // protected, then the objectref must be the current class or a subclass
2746 // of the current class.
2747 VerificationType objectref_type = new_class_type;
2748 if (name_in_supers(ref_class_type.name(), current_class())) {
2749 Klass* ref_klass = load_class(ref_class_type.name(), CHECK);
2750 if (was_recursively_verified()) return;
2751 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2752 vmSymbols::object_initializer_name(),
2753 cp->uncached_signature_ref_at(bcs->get_index_u2()),
2754 Klass::OverpassLookupMode::find);
2755 // Do nothing if method is not found. Let resolution detect the error.
2756 if (m != nullptr) {
2757 InstanceKlass* mh = m->method_holder();
2758 if (m->is_protected() && !mh->is_same_class_package(_klass)) {
2759 bool assignable = current_type().is_assignable_from(
2760 objectref_type, this, true, CHECK_VERIFY(this));
2761 if (!assignable) {
2762 verify_error(ErrorContext::bad_type(bci,
2763 TypeOrigin::cp(new_class_index, objectref_type),
2764 TypeOrigin::implicit(current_type())),
2765 "Bad access to protected <init> method");
2766 return;
2767 }
2768 }
2769 }
2770 }
2771 // Check the exception handler target stackmaps with the locals from the
2772 // incoming stackmap (before initialize_object() changes them to outgoing
2773 // state).
2774 if (in_try_block) {
2775 if (was_recursively_verified()) return;
2776 verify_exception_handler_targets(bci, *this_uninit, current_frame,
2777 stackmap_table, CHECK_VERIFY(this));
2778 }
2779 current_frame->initialize_object(type, new_class_type);
2780 } else {
2781 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2782 "Bad operand type when invoking <init>");
2783 return;
2784 }
2785 }
2786
2787 bool ClassVerifier::is_same_or_direct_interface(
2788 InstanceKlass* klass,
2789 VerificationType klass_type,
2790 VerificationType ref_class_type) {
2791 if (ref_class_type.equals(klass_type)) return true;
2792 Array<InstanceKlass*>* local_interfaces = klass->local_interfaces();
2793 if (local_interfaces != nullptr) {
2794 for (int x = 0; x < local_interfaces->length(); x++) {
2795 InstanceKlass* k = local_interfaces->at(x);
2796 assert (k != nullptr && k->is_interface(), "invalid interface");
2797 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2798 return true;
2799 }
2800 }
2801 }
2802 return false;
2803 }
2804
2805 void ClassVerifier::verify_invoke_instructions(
2806 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2807 bool in_try_block, bool *this_uninit,
2808 const constantPoolHandle& cp, StackMapTable* stackmap_table, TRAPS) {
2809 // Make sure the constant pool item is the right type
2810 u2 index = bcs->get_index_u2();
2811 Bytecodes::Code opcode = bcs->raw_code();
2812 unsigned int types = 0;
2813 switch (opcode) {
2814 case Bytecodes::_invokeinterface:
2815 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2816 break;
2817 case Bytecodes::_invokedynamic:
2818 types = 1 << JVM_CONSTANT_InvokeDynamic;
2819 break;
2820 case Bytecodes::_invokespecial:
2821 case Bytecodes::_invokestatic:
2822 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2823 (1 << JVM_CONSTANT_Methodref) :
2824 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2825 break;
2826 default:
2827 types = 1 << JVM_CONSTANT_Methodref;
2828 }
2829 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2830
2831 // Get method name and signature
2832 Symbol* method_name = cp->uncached_name_ref_at(index);
2833 Symbol* method_sig = cp->uncached_signature_ref_at(index);
2834
2835 // Method signature was checked in ClassFileParser.
2836 assert(SignatureVerifier::is_valid_method_signature(method_sig),
2837 "Invalid method signature");
2838
2839 // Get referenced class
2840 VerificationType ref_class_type;
2841 if (opcode == Bytecodes::_invokedynamic) {
2842 if (_klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2843 class_format_error(
2844 "invokedynamic instructions not supported by this class file version (%d), class %s",
2845 _klass->major_version(), _klass->external_name());
2846 return;
2847 }
2848 } else {
2849 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2850 }
2851
2852 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2853 "buffer type must match VerificationType size");
2854
2855 // Get the UTF8 index for this signature.
2856 int sig_index = cp->signature_ref_index_at(cp->uncached_name_and_type_ref_index_at(index));
2857
2858 // Get the signature's verification types.
2859 sig_as_verification_types* mth_sig_verif_types;
2860 sig_as_verification_types** mth_sig_verif_types_ptr = method_signatures_table()->get(sig_index);
2861 if (mth_sig_verif_types_ptr != nullptr) {
2862 // Found the entry for the signature's verification types in the hash table.
2863 mth_sig_verif_types = *mth_sig_verif_types_ptr;
2864 assert(mth_sig_verif_types != nullptr, "Unexpected null sig_as_verification_types value");
2865 } else {
2866 // Not found, add the entry to the table.
2867 GrowableArray<VerificationType>* verif_types = new GrowableArray<VerificationType>(10);
2868 mth_sig_verif_types = new sig_as_verification_types(verif_types);
2869 create_method_sig_entry(mth_sig_verif_types, sig_index);
2870 }
2871
2872 // Get the number of arguments for this signature.
2873 int nargs = mth_sig_verif_types->num_args();
2874
2875 // Check instruction operands
2876 int bci = bcs->bci();
2877 if (opcode == Bytecodes::_invokeinterface) {
2878 address bcp = bcs->bcp();
2879 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2880 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2881 // the difference between the size of the operand stack before and after the instruction
2882 // executes.
2883 if (*(bcp+3) != (nargs+1)) {
2884 verify_error(ErrorContext::bad_code(bci),
2885 "Inconsistent args count operand in invokeinterface");
2886 return;
2887 }
2888 if (*(bcp+4) != 0) {
2889 verify_error(ErrorContext::bad_code(bci),
2890 "Fourth operand byte of invokeinterface must be zero");
2891 return;
2892 }
2893 }
2894
2895 if (opcode == Bytecodes::_invokedynamic) {
2896 address bcp = bcs->bcp();
2897 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2898 verify_error(ErrorContext::bad_code(bci),
2899 "Third and fourth operand bytes of invokedynamic must be zero");
2900 return;
2901 }
2902 }
2903
2904 if (method_name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
2905 // Make sure:
2906 // <init> can only be invoked by invokespecial.
2907 if (opcode != Bytecodes::_invokespecial ||
2908 method_name != vmSymbols::object_initializer_name()) {
2909 verify_error(ErrorContext::bad_code(bci),
2910 "Illegal call to internal method");
2911 return;
2912 }
2913 } else if (opcode == Bytecodes::_invokespecial
2914 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2915 && !ref_class_type.equals(VerificationType::reference_type(
2916 current_class()->super()->name()))) { // super() can never be an inline_type.
2917 bool subtype = false;
2918 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2919 subtype = ref_class_type.is_assignable_from(
2920 current_type(), this, false, CHECK_VERIFY(this));
2921 if (!subtype) {
2922 verify_error(ErrorContext::bad_code(bci),
2923 "Bad invokespecial instruction: "
2924 "current class isn't assignable to reference class.");
2925 return;
2926 } else if (have_imr_indirect) {
2927 verify_error(ErrorContext::bad_code(bci),
2928 "Bad invokespecial instruction: "
2929 "interface method reference is in an indirect superinterface.");
2930 return;
2931 }
2932
2933 }
2934
2935 // Get the verification types for the method's arguments.
2936 GrowableArray<VerificationType>* sig_verif_types = mth_sig_verif_types->sig_verif_types();
2937 assert(sig_verif_types != nullptr, "Missing signature's array of verification types");
2938 // Match method descriptor with operand stack
2939 // The arguments are on the stack in descending order.
2940 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2941 current_frame->pop_stack(sig_verif_types->at(i), CHECK_VERIFY(this));
2942 }
2943
2944 // Check objectref on operand stack
2945 if (opcode != Bytecodes::_invokestatic &&
2946 opcode != Bytecodes::_invokedynamic) {
2947 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2948 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2949 code_length, in_try_block, this_uninit, cp, stackmap_table,
2950 CHECK_VERIFY(this));
2951 if (was_recursively_verified()) return;
2952 } else { // other methods
2953 // Ensures that target class is assignable to method class.
2954 if (opcode == Bytecodes::_invokespecial) {
2955 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2956 } else if (opcode == Bytecodes::_invokevirtual) {
2957 VerificationType stack_object_type =
2958 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2959 if (current_type() != stack_object_type) {
2960 if (was_recursively_verified()) return;
2961 assert(cp->cache() == nullptr, "not rewritten yet");
2962 Symbol* ref_class_name =
2963 cp->klass_name_at(cp->uncached_klass_ref_index_at(index));
2964 // See the comments in verify_field_instructions() for
2965 // the rationale behind this.
2966 if (name_in_supers(ref_class_name, current_class())) {
2967 Klass* ref_class = load_class(ref_class_name, CHECK);
2968 if (is_protected_access(
2969 _klass, ref_class, method_name, method_sig, true)) {
2970 // It's protected access, check if stack object is
2971 // assignable to current class.
2972 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2973 && stack_object_type.is_array()
2974 && method_name == vmSymbols::clone_name()) {
2975 // Special case: arrays pretend to implement public Object
2976 // clone().
2977 } else {
2978 bool is_assignable = current_type().is_assignable_from(
2979 stack_object_type, this, true, CHECK_VERIFY(this));
2980 if (!is_assignable) {
2981 verify_error(ErrorContext::bad_type(bci,
2982 current_frame->stack_top_ctx(),
2983 TypeOrigin::implicit(current_type())),
2984 "Bad access to protected data in invokevirtual");
2985 return;
2986 }
2987 }
2988 }
2989 }
2990 }
2991 } else {
2992 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2993 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2994 }
2995 }
2996 }
2997 // Push the result type.
2998 int sig_verif_types_len = sig_verif_types->length();
2999 if (sig_verif_types_len > nargs) { // There's a return type
3000 if (method_name == vmSymbols::object_initializer_name()) {
3001 // an <init> method must have a void return type
3002 verify_error(ErrorContext::bad_code(bci),
3003 "Return type must be void in <init> method");
3004 return;
3005 }
3006
3007 assert(sig_verif_types_len <= nargs + 2,
3008 "Signature verification types array return type is bogus");
3009 for (int i = nargs; i < sig_verif_types_len; i++) {
3010 assert(i == nargs || sig_verif_types->at(i).is_long2() ||
3011 sig_verif_types->at(i).is_double2(), "Unexpected return verificationType");
3012 current_frame->push_stack(sig_verif_types->at(i), CHECK_VERIFY(this));
3013 }
3014 }
3015 }
3016
3017 VerificationType ClassVerifier::get_newarray_type(
3018 u2 index, int bci, TRAPS) {
3019 const char* from_bt[] = {
3020 nullptr, nullptr, nullptr, nullptr, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
3021 };
3022 if (index < T_BOOLEAN || index > T_LONG) {
3023 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
3024 return VerificationType::bogus_type();
3025 }
3026
3027 // from_bt[index] contains the array signature which has a length of 2
3028 Symbol* sig = create_temporary_symbol(from_bt[index], 2);
3029 return VerificationType::reference_type(sig);
3030 }
3031
3032 void ClassVerifier::verify_anewarray(
3033 int bci, u2 index, const constantPoolHandle& cp,
3034 StackMapFrame* current_frame, TRAPS) {
3035 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
3036 current_frame->pop_stack(
3037 VerificationType::integer_type(), CHECK_VERIFY(this));
3038
3039 if (was_recursively_verified()) return;
3040 VerificationType component_type =
3041 cp_index_to_type(index, cp, CHECK_VERIFY(this));
3042 int length;
3043 char* arr_sig_str;
3044 if (component_type.is_array()) { // it's an array
3045 const char* component_name = component_type.name()->as_utf8();
3046 // Check for more than MAX_ARRAY_DIMENSIONS
3047 length = (int)strlen(component_name);
3048 if (length > MAX_ARRAY_DIMENSIONS &&
3049 component_name[MAX_ARRAY_DIMENSIONS - 1] == JVM_SIGNATURE_ARRAY) {
3050 verify_error(ErrorContext::bad_code(bci),
3051 "Illegal anewarray instruction, array has more than 255 dimensions");
3052 }
3053 // add one dimension to component
3054 length++;
3055 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length + 1);
3056 int n = os::snprintf(arr_sig_str, length + 1, "%c%s",
3057 JVM_SIGNATURE_ARRAY, component_name);
3058 assert(n == length, "Unexpected number of characters in string");
3059 } else { // it's an object or interface
3060 const char* component_name = component_type.name()->as_utf8();
3061 // add one dimension to component with 'L' prepended and ';' postpended.
3062 length = (int)strlen(component_name) + 3;
3063 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length + 1);
3064 int n = os::snprintf(arr_sig_str, length + 1, "%c%c%s;",
3065 JVM_SIGNATURE_ARRAY, JVM_SIGNATURE_CLASS, component_name);
3066 assert(n == length, "Unexpected number of characters in string");
3067 }
3068 Symbol* arr_sig = create_temporary_symbol(arr_sig_str, length);
3069 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
3070 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
3071 }
3072
3073 void ClassVerifier::verify_iload(int index, StackMapFrame* current_frame, TRAPS) {
3074 current_frame->get_local(
3075 index, VerificationType::integer_type(), CHECK_VERIFY(this));
3076 current_frame->push_stack(
3077 VerificationType::integer_type(), CHECK_VERIFY(this));
3078 }
3079
3080 void ClassVerifier::verify_lload(int index, StackMapFrame* current_frame, TRAPS) {
3081 current_frame->get_local_2(
3082 index, VerificationType::long_type(),
3083 VerificationType::long2_type(), CHECK_VERIFY(this));
3084 current_frame->push_stack_2(
3085 VerificationType::long_type(),
3086 VerificationType::long2_type(), CHECK_VERIFY(this));
3087 }
3088
3089 void ClassVerifier::verify_fload(int index, StackMapFrame* current_frame, TRAPS) {
3090 current_frame->get_local(
3091 index, VerificationType::float_type(), CHECK_VERIFY(this));
3092 current_frame->push_stack(
3093 VerificationType::float_type(), CHECK_VERIFY(this));
3094 }
3095
3096 void ClassVerifier::verify_dload(int index, StackMapFrame* current_frame, TRAPS) {
3097 current_frame->get_local_2(
3098 index, VerificationType::double_type(),
3099 VerificationType::double2_type(), CHECK_VERIFY(this));
3100 current_frame->push_stack_2(
3101 VerificationType::double_type(),
3102 VerificationType::double2_type(), CHECK_VERIFY(this));
3103 }
3104
3105 void ClassVerifier::verify_aload(int index, StackMapFrame* current_frame, TRAPS) {
3106 VerificationType type = current_frame->get_local(
3107 index, VerificationType::nonscalar_check(), CHECK_VERIFY(this));
3108 current_frame->push_stack(type, CHECK_VERIFY(this));
3109 }
3110
3111 void ClassVerifier::verify_istore(int index, StackMapFrame* current_frame, TRAPS) {
3112 current_frame->pop_stack(
3113 VerificationType::integer_type(), CHECK_VERIFY(this));
3114 current_frame->set_local(
3115 index, VerificationType::integer_type(), CHECK_VERIFY(this));
3116 }
3117
3118 void ClassVerifier::verify_lstore(int index, StackMapFrame* current_frame, TRAPS) {
3119 current_frame->pop_stack_2(
3120 VerificationType::long2_type(),
3121 VerificationType::long_type(), CHECK_VERIFY(this));
3122 current_frame->set_local_2(
3123 index, VerificationType::long_type(),
3124 VerificationType::long2_type(), CHECK_VERIFY(this));
3125 }
3126
3127 void ClassVerifier::verify_fstore(int index, StackMapFrame* current_frame, TRAPS) {
3128 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
3129 current_frame->set_local(
3130 index, VerificationType::float_type(), CHECK_VERIFY(this));
3131 }
3132
3133 void ClassVerifier::verify_dstore(int index, StackMapFrame* current_frame, TRAPS) {
3134 current_frame->pop_stack_2(
3135 VerificationType::double2_type(),
3136 VerificationType::double_type(), CHECK_VERIFY(this));
3137 current_frame->set_local_2(
3138 index, VerificationType::double_type(),
3139 VerificationType::double2_type(), CHECK_VERIFY(this));
3140 }
3141
3142 void ClassVerifier::verify_astore(int index, StackMapFrame* current_frame, TRAPS) {
3143 VerificationType type = current_frame->pop_stack(
3144 VerificationType::nonscalar_check(), CHECK_VERIFY(this));
3145 current_frame->set_local(index, type, CHECK_VERIFY(this));
3146 }
3147
3148 void ClassVerifier::verify_iinc(int index, StackMapFrame* current_frame, TRAPS) {
3149 VerificationType type = current_frame->get_local(
3150 index, VerificationType::integer_type(), CHECK_VERIFY(this));
3151 current_frame->set_local(index, type, CHECK_VERIFY(this));
3152 }
3153
3154 void ClassVerifier::verify_return_value(
3155 VerificationType return_type, VerificationType type, int bci,
3156 StackMapFrame* current_frame, TRAPS) {
3157 if (return_type == VerificationType::bogus_type()) {
3158 verify_error(ErrorContext::bad_type(bci,
3159 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
3160 "Method does not expect a return value");
3161 return;
3162 }
3163 bool match = return_type.is_assignable_from(type, this, false, CHECK_VERIFY(this));
3164 if (!match) {
3165 verify_error(ErrorContext::bad_type(bci,
3166 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
3167 "Bad return type");
3168 return;
3169 }
3170 }
3171
3172 // The verifier creates symbols which are substrings of Symbols.
3173 // These are stored in the verifier until the end of verification so that
3174 // they can be reference counted.
3175 Symbol* ClassVerifier::create_temporary_symbol(const char *name, int length) {
3176 // Quick deduplication check
3177 if (_previous_symbol != nullptr && _previous_symbol->equals(name, length)) {
3178 return _previous_symbol;
3179 }
3180 Symbol* sym = SymbolTable::new_symbol(name, length);
3181 if (!sym->is_permanent()) {
3182 if (_symbols == nullptr) {
3183 _symbols = new GrowableArray<Symbol*>(50, 0, nullptr);
3184 }
3185 _symbols->push(sym);
3186 }
3187 _previous_symbol = sym;
3188 return sym;
3189 }