1 /*
2 * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/stackMapTable.hpp"
29 #include "classfile/stackMapFrame.hpp"
30 #include "classfile/stackMapTableFormat.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/bytecodeStream.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "oops/typeArrayOop.hpp"
41 #include "prims/jvm.h"
42 #include "runtime/fieldDescriptor.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/orderAccess.inline.hpp"
47 #include "runtime/os.hpp"
48 #include "utilities/bytes.hpp"
49
50 #define NOFAILOVER_MAJOR_VERSION 51
51 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
52 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
53
54 // Access to external entry for VerifyClassCodes - old byte code verifier
55
56 extern "C" {
57 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
58 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
59 }
60
61 static void* volatile _verify_byte_codes_fn = NULL;
62
63 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
64
65 static void* verify_byte_codes_fn() {
66 if (_verify_byte_codes_fn == NULL) {
67 void *lib_handle = os::native_java_library();
68 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
69 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
70 if (func == NULL) {
71 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
72 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
73 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
74 }
75 }
76 return (void*)_verify_byte_codes_fn;
77 }
78
79
80 // Methods in Verifier
81
82 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
83 return (class_loader == NULL || !should_verify_class) ?
84 BytecodeVerificationLocal : BytecodeVerificationRemote;
85 }
86
87 bool Verifier::relax_verify_for(oop loader) {
88 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
89 bool need_verify =
90 // verifyAll
91 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
92 // verifyRemote
93 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
94 return !need_verify;
95 }
96
97 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
98 HandleMark hm;
99 ResourceMark rm(THREAD);
100
101 // Eagerly allocate the identity hash code for a klass. This is a fallout
102 // from 6320749 and 8059924: hash code generator is not supposed to be called
103 // during the safepoint, but it allows to sneak the hashcode in during
104 // verification. Without this eager hashcode generation, we may end up
105 // installing the hashcode during some other operation, which may be at
106 // safepoint -- blowing up the checks. It was previously done as the side
107 // effect (sic!) for external_name(), but instead of doing that, we opt to
108 // explicitly push the hashcode in here. This is signify the following block
109 // is IMPORTANT:
110 if (klass->java_mirror() != NULL) {
111 klass->java_mirror()->identity_hash();
112 }
113
114 if (!is_eligible_for_verification(klass, should_verify_class)) {
115 return true;
116 }
117
118 // If the class should be verified, first see if we can use the split
119 // verifier. If not, or if verification fails and FailOverToOldVerifier
120 // is set, then call the inference verifier.
121
122 Symbol* exception_name = NULL;
123 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
124 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
125 char* exception_message = message_buffer;
126
127 const char* klassName = klass->external_name();
128 bool can_failover = FailOverToOldVerifier &&
129 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
130
131 if (TraceClassInitialization) {
132 tty->print_cr("Start class verification for: %s", klassName);
133 }
134 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
135 ClassVerifier split_verifier(klass, THREAD);
136 split_verifier.verify_class(THREAD);
137 exception_name = split_verifier.result();
138 if (can_failover && !HAS_PENDING_EXCEPTION &&
139 (exception_name == vmSymbols::java_lang_VerifyError() ||
140 exception_name == vmSymbols::java_lang_ClassFormatError())) {
141 if (TraceClassInitialization || VerboseVerification) {
142 tty->print_cr(
143 "Fail over class verification to old verifier for: %s", klassName);
144 }
145 exception_name = inference_verify(
146 klass, message_buffer, message_buffer_len, THREAD);
147 }
148 if (exception_name != NULL) {
149 exception_message = split_verifier.exception_message();
150 }
151 } else {
152 exception_name = inference_verify(
153 klass, message_buffer, message_buffer_len, THREAD);
154 }
155
156 if (TraceClassInitialization || VerboseVerification) {
157 if (HAS_PENDING_EXCEPTION) {
158 tty->print("Verification for %s has", klassName);
159 tty->print_cr(" exception pending %s ",
160 InstanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
161 } else if (exception_name != NULL) {
162 tty->print_cr("Verification for %s failed", klassName);
163 }
164 tty->print_cr("End class verification for: %s", klassName);
165 }
166
167 if (HAS_PENDING_EXCEPTION) {
168 return false; // use the existing exception
169 } else if (exception_name == NULL) {
170 return true; // verifcation succeeded
171 } else { // VerifyError or ClassFormatError to be created and thrown
172 ResourceMark rm(THREAD);
173 instanceKlassHandle kls =
174 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
175 while (!kls.is_null()) {
176 if (kls == klass) {
177 // If the class being verified is the exception we're creating
178 // or one of it's superclasses, we're in trouble and are going
179 // to infinitely recurse when we try to initialize the exception.
180 // So bail out here by throwing the preallocated VM error.
181 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
182 }
183 kls = kls->super();
184 }
185 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
186 THROW_MSG_(exception_name, exception_message, false);
187 }
188 }
189
190 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
191 Symbol* name = klass->name();
192 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
193
194 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
195
196 return (should_verify_for(klass->class_loader(), should_verify_class) &&
197 // return if the class is a bootstrapping class
198 // or defineClass specified not to verify by default (flags override passed arg)
199 // We need to skip the following four for bootstraping
200 name != vmSymbols::java_lang_Object() &&
201 name != vmSymbols::java_lang_Class() &&
202 name != vmSymbols::java_lang_String() &&
203 name != vmSymbols::java_lang_Throwable() &&
204
205 // Can not verify the bytecodes for shared classes because they have
206 // already been rewritten to contain constant pool cache indices,
207 // which the verifier can't understand.
208 // Shared classes shouldn't have stackmaps either.
209 !klass()->is_shared() &&
210
211 // As of the fix for 4486457 we disable verification for all of the
212 // dynamically-generated bytecodes associated with the 1.4
213 // reflection implementation, not just those associated with
214 // sun/reflect/SerializationConstructorAccessor.
215 // NOTE: this is called too early in the bootstrapping process to be
216 // guarded by Universe::is_gte_jdk14x_version().
217 // Also for lambda generated code, gte jdk8
218 (!is_reflect));
219 }
220
221 Symbol* Verifier::inference_verify(
222 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
223 JavaThread* thread = (JavaThread*)THREAD;
224 JNIEnv *env = thread->jni_environment();
225
226 void* verify_func = verify_byte_codes_fn();
227
228 if (verify_func == NULL) {
229 jio_snprintf(message, message_len, "Could not link verifier");
230 return vmSymbols::java_lang_VerifyError();
231 }
232
233 ResourceMark rm(THREAD);
234 if (VerboseVerification) {
235 tty->print_cr("Verifying class %s with old format", klass->external_name());
236 }
237
238 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
239 jint result;
240
241 {
242 HandleMark hm(thread);
243 ThreadToNativeFromVM ttn(thread);
244 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
245 // code knows that we have left the VM
246
247 if (_is_new_verify_byte_codes_fn) {
248 verify_byte_codes_fn_new_t func =
249 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
250 result = (*func)(env, cls, message, (int)message_len,
251 klass->major_version());
252 } else {
253 verify_byte_codes_fn_t func =
254 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
255 result = (*func)(env, cls, message, (int)message_len);
256 }
257 }
258
259 JNIHandles::destroy_local(cls);
260
261 // These numbers are chosen so that VerifyClassCodes interface doesn't need
262 // to be changed (still return jboolean (unsigned char)), and result is
263 // 1 when verification is passed.
264 if (result == 0) {
265 return vmSymbols::java_lang_VerifyError();
266 } else if (result == 1) {
267 return NULL; // verified.
268 } else if (result == 2) {
269 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
270 } else if (result == 3) {
271 return vmSymbols::java_lang_ClassFormatError();
272 } else {
273 ShouldNotReachHere();
274 return NULL;
275 }
276 }
277
278 TypeOrigin TypeOrigin::null() {
279 return TypeOrigin();
280 }
281 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
282 assert(frame != NULL, "Must have a frame");
283 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
284 frame->local_at(index));
285 }
286 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
287 assert(frame != NULL, "Must have a frame");
288 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
289 frame->stack_at(index));
290 }
291 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
292 assert(frame != NULL, "Must have a frame");
293 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
294 frame->local_at(index));
295 }
296 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
297 assert(frame != NULL, "Must have a frame");
298 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
299 frame->stack_at(index));
300 }
301 TypeOrigin TypeOrigin::bad_index(u2 index) {
302 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
303 }
304 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
305 return TypeOrigin(CONST_POOL, index, NULL, vt);
306 }
307 TypeOrigin TypeOrigin::signature(VerificationType vt) {
308 return TypeOrigin(SIG, 0, NULL, vt);
309 }
310 TypeOrigin TypeOrigin::implicit(VerificationType t) {
311 return TypeOrigin(IMPLICIT, 0, NULL, t);
312 }
313 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
314 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
315 VerificationType::bogus_type());
316 }
317
318 void TypeOrigin::reset_frame() {
319 if (_frame != NULL) {
320 _frame->restore();
321 }
322 }
323
324 void TypeOrigin::details(outputStream* ss) const {
325 _type.print_on(ss);
326 switch (_origin) {
327 case CF_LOCALS:
328 ss->print(" (current frame, locals[%d])", _index);
329 break;
330 case CF_STACK:
331 ss->print(" (current frame, stack[%d])", _index);
332 break;
333 case SM_LOCALS:
334 ss->print(" (stack map, locals[%d])", _index);
335 break;
336 case SM_STACK:
337 ss->print(" (stack map, stack[%d])", _index);
338 break;
339 case CONST_POOL:
340 ss->print(" (constant pool %d)", _index);
341 break;
342 case SIG:
343 ss->print(" (from method signature)");
344 break;
345 case IMPLICIT:
346 case FRAME_ONLY:
347 case NONE:
348 default:
349 ;
350 }
351 }
352
353 #ifdef ASSERT
354 void TypeOrigin::print_on(outputStream* str) const {
355 str->print("{%d,%d,%p:", _origin, _index, _frame);
356 if (_frame != NULL) {
357 _frame->print_on(str);
358 } else {
359 str->print("null");
360 }
361 str->print(",");
362 _type.print_on(str);
363 str->print("}");
364 }
365 #endif
366
367 void ErrorContext::details(outputStream* ss, const Method* method) const {
368 if (is_valid()) {
369 ss->cr();
370 ss->print_cr("Exception Details:");
371 location_details(ss, method);
372 reason_details(ss);
373 frame_details(ss);
374 bytecode_details(ss, method);
375 handler_details(ss, method);
376 stackmap_details(ss, method);
377 }
378 }
379
380 void ErrorContext::reason_details(outputStream* ss) const {
381 streamIndentor si(ss);
382 ss->indent().print_cr("Reason:");
383 streamIndentor si2(ss);
384 ss->indent().print("%s", "");
385 switch (_fault) {
386 case INVALID_BYTECODE:
387 ss->print("Error exists in the bytecode");
388 break;
389 case WRONG_TYPE:
390 if (_expected.is_valid()) {
391 ss->print("Type ");
392 _type.details(ss);
393 ss->print(" is not assignable to ");
394 _expected.details(ss);
395 } else {
396 ss->print("Invalid type: ");
397 _type.details(ss);
398 }
399 break;
400 case FLAGS_MISMATCH:
401 if (_expected.is_valid()) {
402 ss->print("Current frame's flags are not assignable "
403 "to stack map frame's.");
404 } else {
405 ss->print("Current frame's flags are invalid in this context.");
406 }
407 break;
408 case BAD_CP_INDEX:
409 ss->print("Constant pool index %d is invalid", _type.index());
410 break;
411 case BAD_LOCAL_INDEX:
412 ss->print("Local index %d is invalid", _type.index());
413 break;
414 case LOCALS_SIZE_MISMATCH:
415 ss->print("Current frame's local size doesn't match stackmap.");
416 break;
417 case STACK_SIZE_MISMATCH:
418 ss->print("Current frame's stack size doesn't match stackmap.");
419 break;
420 case STACK_OVERFLOW:
421 ss->print("Exceeded max stack size.");
422 break;
423 case STACK_UNDERFLOW:
424 ss->print("Attempt to pop empty stack.");
425 break;
426 case MISSING_STACKMAP:
427 ss->print("Expected stackmap frame at this location.");
428 break;
429 case BAD_STACKMAP:
430 ss->print("Invalid stackmap specification.");
431 break;
432 case UNKNOWN:
433 default:
434 ShouldNotReachHere();
435 ss->print_cr("Unknown");
436 }
437 ss->cr();
438 }
439
440 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
441 if (_bci != -1 && method != NULL) {
442 streamIndentor si(ss);
443 const char* bytecode_name = "<invalid>";
444 if (method->validate_bci(_bci) != -1) {
445 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
446 if (Bytecodes::is_defined(code)) {
447 bytecode_name = Bytecodes::name(code);
448 } else {
449 bytecode_name = "<illegal>";
450 }
451 }
452 InstanceKlass* ik = method->method_holder();
453 ss->indent().print_cr("Location:");
454 streamIndentor si2(ss);
455 ss->indent().print_cr("%s.%s%s @%d: %s",
456 ik->name()->as_C_string(), method->name()->as_C_string(),
457 method->signature()->as_C_string(), _bci, bytecode_name);
458 }
459 }
460
461 void ErrorContext::frame_details(outputStream* ss) const {
462 streamIndentor si(ss);
463 if (_type.is_valid() && _type.frame() != NULL) {
464 ss->indent().print_cr("Current Frame:");
465 streamIndentor si2(ss);
466 _type.frame()->print_on(ss);
467 }
468 if (_expected.is_valid() && _expected.frame() != NULL) {
469 ss->indent().print_cr("Stackmap Frame:");
470 streamIndentor si2(ss);
471 _expected.frame()->print_on(ss);
472 }
473 }
474
475 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
476 if (method != NULL) {
477 streamIndentor si(ss);
478 ss->indent().print_cr("Bytecode:");
479 streamIndentor si2(ss);
480 ss->print_data(method->code_base(), method->code_size(), false);
481 }
482 }
483
484 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
485 if (method != NULL) {
486 streamIndentor si(ss);
487 ExceptionTable table(method);
488 if (table.length() > 0) {
489 ss->indent().print_cr("Exception Handler Table:");
490 streamIndentor si2(ss);
491 for (int i = 0; i < table.length(); ++i) {
492 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
493 table.end_pc(i), table.handler_pc(i));
494 }
495 }
496 }
497 }
498
499 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
500 if (method != NULL && method->has_stackmap_table()) {
501 streamIndentor si(ss);
502 ss->indent().print_cr("Stackmap Table:");
503 Array<u1>* data = method->stackmap_data();
504 stack_map_table* sm_table =
505 stack_map_table::at((address)data->adr_at(0));
506 stack_map_frame* sm_frame = sm_table->entries();
507 streamIndentor si2(ss);
508 int current_offset = -1;
509 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
510 ss->indent();
511 sm_frame->print_on(ss, current_offset);
512 ss->cr();
513 current_offset += sm_frame->offset_delta();
514 sm_frame = sm_frame->next();
515 }
516 }
517 }
518
519 // Methods in ClassVerifier
520
521 ClassVerifier::ClassVerifier(
522 instanceKlassHandle klass, TRAPS)
523 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
524 _this_type = VerificationType::reference_type(klass->name());
525 // Create list to hold symbols in reference area.
526 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
527 }
528
529 ClassVerifier::~ClassVerifier() {
530 // Decrement the reference count for any symbols created.
531 for (int i = 0; i < _symbols->length(); i++) {
532 Symbol* s = _symbols->at(i);
533 s->decrement_refcount();
534 }
535 }
536
537 VerificationType ClassVerifier::object_type() const {
538 return VerificationType::reference_type(vmSymbols::java_lang_Object());
539 }
540
541 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) {
542 VerificationType vt = VerificationType::reference_type(
543 create_temporary_symbol(sig, (int)strlen(sig), THREAD));
544 return TypeOrigin::implicit(vt);
545 }
546
547 void ClassVerifier::verify_class(TRAPS) {
548 if (VerboseVerification) {
549 tty->print_cr("Verifying class %s with new format",
550 _klass->external_name());
551 }
552
553 Array<Method*>* methods = _klass->methods();
554 int num_methods = methods->length();
555
556 for (int index = 0; index < num_methods; index++) {
557 // Check for recursive re-verification before each method.
558 if (was_recursively_verified()) return;
559
560 Method* m = methods->at(index);
561 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
562 // If m is native or abstract, skip it. It is checked in class file
563 // parser that methods do not override a final method. Overpass methods
564 // are trusted since the VM generates them.
565 continue;
566 }
567 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
568 }
569
570 if (VerboseVerification || TraceClassInitialization) {
571 if (was_recursively_verified())
572 tty->print_cr("Recursive verification detected for: %s",
573 _klass->external_name());
574 }
575 }
576
577 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
578 HandleMark hm(THREAD);
579 _method = m; // initialize _method
580 if (VerboseVerification) {
581 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
582 }
583
584 // For clang, the only good constant format string is a literal constant format string.
585 #define bad_type_msg "Bad type on operand stack in %s"
586
587 int32_t max_stack = m->verifier_max_stack();
588 int32_t max_locals = m->max_locals();
589 constantPoolHandle cp(THREAD, m->constants());
590
591 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
592 class_format_error("Invalid method signature");
593 return;
594 }
595
596 // Initial stack map frame: offset is 0, stack is initially empty.
597 StackMapFrame current_frame(max_locals, max_stack, this);
598 // Set initial locals
599 VerificationType return_type = current_frame.set_locals_from_arg(
600 m, current_type(), CHECK_VERIFY(this));
601
602 int32_t stackmap_index = 0; // index to the stackmap array
603
604 u4 code_length = m->code_size();
605
606 // Scan the bytecode and map each instruction's start offset to a number.
607 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
608
609 int ex_min = code_length;
610 int ex_max = -1;
611 // Look through each item on the exception table. Each of the fields must refer
612 // to a legal instruction.
613 verify_exception_handler_table(
614 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
615
616 // Look through each entry on the local variable table and make sure
617 // its range of code array offsets is valid. (4169817)
618 if (m->has_localvariable_table()) {
619 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
620 }
621
622 Array<u1>* stackmap_data = m->stackmap_data();
623 StackMapStream stream(stackmap_data);
624 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
625 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
626 code_data, code_length, CHECK_VERIFY(this));
627
628 if (VerboseVerification) {
629 stackmap_table.print_on(tty);
630 }
631
632 RawBytecodeStream bcs(m);
633
634 // Scan the byte code linearly from the start to the end
635 bool no_control_flow = false; // Set to true when there is no direct control
636 // flow from current instruction to the next
637 // instruction in sequence
638
639 Bytecodes::Code opcode;
640 while (!bcs.is_last_bytecode()) {
641 // Check for recursive re-verification before each bytecode.
642 if (was_recursively_verified()) return;
643
644 opcode = bcs.raw_next();
645 u2 bci = bcs.bci();
646
647 // Set current frame's offset to bci
648 current_frame.set_offset(bci);
649 current_frame.set_mark();
650
651 // Make sure every offset in stackmap table point to the beginning to
652 // an instruction. Match current_frame to stackmap_table entry with
653 // the same offset if exists.
654 stackmap_index = verify_stackmap_table(
655 stackmap_index, bci, ¤t_frame, &stackmap_table,
656 no_control_flow, CHECK_VERIFY(this));
657
658
659 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
660 bool verified_exc_handlers = false;
661
662 // Merge with the next instruction
663 {
664 u2 index;
665 int target;
666 VerificationType type, type2;
667 VerificationType atype;
668
669 #ifndef PRODUCT
670 if (VerboseVerification) {
671 current_frame.print_on(tty);
672 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
673 }
674 #endif
675
676 // Make sure wide instruction is in correct format
677 if (bcs.is_wide()) {
678 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
679 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
680 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
681 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
682 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
683 opcode != Bytecodes::_dstore) {
684 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
685 * if we encounter a wide instruction that modifies an invalid
686 * opcode (not one of the ones listed above) */
687 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
688 return;
689 }
690 }
691
692 // Look for possible jump target in exception handlers and see if it
693 // matches current_frame. Do this check here for astore* opcodes because
694 // they can both reference the exception object in a handler and change
695 // the type state. JVM Spec says that the incoming type state should be
696 // used for this check.
697 if (Bytecodes::is_astore(opcode) && bci >= ex_min && bci < ex_max) {
698 verify_exception_handler_targets(
699 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
700 verified_exc_handlers = true;
701 }
702
703 switch (opcode) {
704 case Bytecodes::_nop :
705 no_control_flow = false; break;
706 case Bytecodes::_aconst_null :
707 current_frame.push_stack(
708 VerificationType::null_type(), CHECK_VERIFY(this));
709 no_control_flow = false; break;
710 case Bytecodes::_iconst_m1 :
711 case Bytecodes::_iconst_0 :
712 case Bytecodes::_iconst_1 :
713 case Bytecodes::_iconst_2 :
714 case Bytecodes::_iconst_3 :
715 case Bytecodes::_iconst_4 :
716 case Bytecodes::_iconst_5 :
717 current_frame.push_stack(
718 VerificationType::integer_type(), CHECK_VERIFY(this));
719 no_control_flow = false; break;
720 case Bytecodes::_lconst_0 :
721 case Bytecodes::_lconst_1 :
722 current_frame.push_stack_2(
723 VerificationType::long_type(),
724 VerificationType::long2_type(), CHECK_VERIFY(this));
725 no_control_flow = false; break;
726 case Bytecodes::_fconst_0 :
727 case Bytecodes::_fconst_1 :
728 case Bytecodes::_fconst_2 :
729 current_frame.push_stack(
730 VerificationType::float_type(), CHECK_VERIFY(this));
731 no_control_flow = false; break;
732 case Bytecodes::_dconst_0 :
733 case Bytecodes::_dconst_1 :
734 current_frame.push_stack_2(
735 VerificationType::double_type(),
736 VerificationType::double2_type(), CHECK_VERIFY(this));
737 no_control_flow = false; break;
738 case Bytecodes::_sipush :
739 case Bytecodes::_bipush :
740 current_frame.push_stack(
741 VerificationType::integer_type(), CHECK_VERIFY(this));
742 no_control_flow = false; break;
743 case Bytecodes::_ldc :
744 verify_ldc(
745 opcode, bcs.get_index_u1(), ¤t_frame,
746 cp, bci, CHECK_VERIFY(this));
747 no_control_flow = false; break;
748 case Bytecodes::_ldc_w :
749 case Bytecodes::_ldc2_w :
750 verify_ldc(
751 opcode, bcs.get_index_u2(), ¤t_frame,
752 cp, bci, CHECK_VERIFY(this));
753 no_control_flow = false; break;
754 case Bytecodes::_iload :
755 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
756 no_control_flow = false; break;
757 case Bytecodes::_iload_0 :
758 case Bytecodes::_iload_1 :
759 case Bytecodes::_iload_2 :
760 case Bytecodes::_iload_3 :
761 index = opcode - Bytecodes::_iload_0;
762 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
763 no_control_flow = false; break;
764 case Bytecodes::_lload :
765 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
766 no_control_flow = false; break;
767 case Bytecodes::_lload_0 :
768 case Bytecodes::_lload_1 :
769 case Bytecodes::_lload_2 :
770 case Bytecodes::_lload_3 :
771 index = opcode - Bytecodes::_lload_0;
772 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
773 no_control_flow = false; break;
774 case Bytecodes::_fload :
775 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
776 no_control_flow = false; break;
777 case Bytecodes::_fload_0 :
778 case Bytecodes::_fload_1 :
779 case Bytecodes::_fload_2 :
780 case Bytecodes::_fload_3 :
781 index = opcode - Bytecodes::_fload_0;
782 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
783 no_control_flow = false; break;
784 case Bytecodes::_dload :
785 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
786 no_control_flow = false; break;
787 case Bytecodes::_dload_0 :
788 case Bytecodes::_dload_1 :
789 case Bytecodes::_dload_2 :
790 case Bytecodes::_dload_3 :
791 index = opcode - Bytecodes::_dload_0;
792 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
793 no_control_flow = false; break;
794 case Bytecodes::_aload :
795 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
796 no_control_flow = false; break;
797 case Bytecodes::_aload_0 :
798 case Bytecodes::_aload_1 :
799 case Bytecodes::_aload_2 :
800 case Bytecodes::_aload_3 :
801 index = opcode - Bytecodes::_aload_0;
802 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
803 no_control_flow = false; break;
804 case Bytecodes::_iaload :
805 type = current_frame.pop_stack(
806 VerificationType::integer_type(), CHECK_VERIFY(this));
807 atype = current_frame.pop_stack(
808 VerificationType::reference_check(), CHECK_VERIFY(this));
809 if (!atype.is_int_array()) {
810 verify_error(ErrorContext::bad_type(bci,
811 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
812 bad_type_msg, "iaload");
813 return;
814 }
815 current_frame.push_stack(
816 VerificationType::integer_type(), CHECK_VERIFY(this));
817 no_control_flow = false; break;
818 case Bytecodes::_baload :
819 type = current_frame.pop_stack(
820 VerificationType::integer_type(), CHECK_VERIFY(this));
821 atype = current_frame.pop_stack(
822 VerificationType::reference_check(), CHECK_VERIFY(this));
823 if (!atype.is_bool_array() && !atype.is_byte_array()) {
824 verify_error(
825 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
826 bad_type_msg, "baload");
827 return;
828 }
829 current_frame.push_stack(
830 VerificationType::integer_type(), CHECK_VERIFY(this));
831 no_control_flow = false; break;
832 case Bytecodes::_caload :
833 type = current_frame.pop_stack(
834 VerificationType::integer_type(), CHECK_VERIFY(this));
835 atype = current_frame.pop_stack(
836 VerificationType::reference_check(), CHECK_VERIFY(this));
837 if (!atype.is_char_array()) {
838 verify_error(ErrorContext::bad_type(bci,
839 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
840 bad_type_msg, "caload");
841 return;
842 }
843 current_frame.push_stack(
844 VerificationType::integer_type(), CHECK_VERIFY(this));
845 no_control_flow = false; break;
846 case Bytecodes::_saload :
847 type = current_frame.pop_stack(
848 VerificationType::integer_type(), CHECK_VERIFY(this));
849 atype = current_frame.pop_stack(
850 VerificationType::reference_check(), CHECK_VERIFY(this));
851 if (!atype.is_short_array()) {
852 verify_error(ErrorContext::bad_type(bci,
853 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
854 bad_type_msg, "saload");
855 return;
856 }
857 current_frame.push_stack(
858 VerificationType::integer_type(), CHECK_VERIFY(this));
859 no_control_flow = false; break;
860 case Bytecodes::_laload :
861 type = current_frame.pop_stack(
862 VerificationType::integer_type(), CHECK_VERIFY(this));
863 atype = current_frame.pop_stack(
864 VerificationType::reference_check(), CHECK_VERIFY(this));
865 if (!atype.is_long_array()) {
866 verify_error(ErrorContext::bad_type(bci,
867 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
868 bad_type_msg, "laload");
869 return;
870 }
871 current_frame.push_stack_2(
872 VerificationType::long_type(),
873 VerificationType::long2_type(), CHECK_VERIFY(this));
874 no_control_flow = false; break;
875 case Bytecodes::_faload :
876 type = current_frame.pop_stack(
877 VerificationType::integer_type(), CHECK_VERIFY(this));
878 atype = current_frame.pop_stack(
879 VerificationType::reference_check(), CHECK_VERIFY(this));
880 if (!atype.is_float_array()) {
881 verify_error(ErrorContext::bad_type(bci,
882 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
883 bad_type_msg, "faload");
884 return;
885 }
886 current_frame.push_stack(
887 VerificationType::float_type(), CHECK_VERIFY(this));
888 no_control_flow = false; break;
889 case Bytecodes::_daload :
890 type = current_frame.pop_stack(
891 VerificationType::integer_type(), CHECK_VERIFY(this));
892 atype = current_frame.pop_stack(
893 VerificationType::reference_check(), CHECK_VERIFY(this));
894 if (!atype.is_double_array()) {
895 verify_error(ErrorContext::bad_type(bci,
896 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
897 bad_type_msg, "daload");
898 return;
899 }
900 current_frame.push_stack_2(
901 VerificationType::double_type(),
902 VerificationType::double2_type(), CHECK_VERIFY(this));
903 no_control_flow = false; break;
904 case Bytecodes::_aaload : {
905 type = current_frame.pop_stack(
906 VerificationType::integer_type(), CHECK_VERIFY(this));
907 atype = current_frame.pop_stack(
908 VerificationType::reference_check(), CHECK_VERIFY(this));
909 if (!atype.is_reference_array()) {
910 verify_error(ErrorContext::bad_type(bci,
911 current_frame.stack_top_ctx(),
912 TypeOrigin::implicit(VerificationType::reference_check())),
913 bad_type_msg, "aaload");
914 return;
915 }
916 if (atype.is_null()) {
917 current_frame.push_stack(
918 VerificationType::null_type(), CHECK_VERIFY(this));
919 } else {
920 VerificationType component =
921 atype.get_component(this, CHECK_VERIFY(this));
922 current_frame.push_stack(component, CHECK_VERIFY(this));
923 }
924 no_control_flow = false; break;
925 }
926 case Bytecodes::_istore :
927 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
928 no_control_flow = false; break;
929 case Bytecodes::_istore_0 :
930 case Bytecodes::_istore_1 :
931 case Bytecodes::_istore_2 :
932 case Bytecodes::_istore_3 :
933 index = opcode - Bytecodes::_istore_0;
934 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
935 no_control_flow = false; break;
936 case Bytecodes::_lstore :
937 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
938 no_control_flow = false; break;
939 case Bytecodes::_lstore_0 :
940 case Bytecodes::_lstore_1 :
941 case Bytecodes::_lstore_2 :
942 case Bytecodes::_lstore_3 :
943 index = opcode - Bytecodes::_lstore_0;
944 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
945 no_control_flow = false; break;
946 case Bytecodes::_fstore :
947 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
948 no_control_flow = false; break;
949 case Bytecodes::_fstore_0 :
950 case Bytecodes::_fstore_1 :
951 case Bytecodes::_fstore_2 :
952 case Bytecodes::_fstore_3 :
953 index = opcode - Bytecodes::_fstore_0;
954 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
955 no_control_flow = false; break;
956 case Bytecodes::_dstore :
957 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
958 no_control_flow = false; break;
959 case Bytecodes::_dstore_0 :
960 case Bytecodes::_dstore_1 :
961 case Bytecodes::_dstore_2 :
962 case Bytecodes::_dstore_3 :
963 index = opcode - Bytecodes::_dstore_0;
964 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
965 no_control_flow = false; break;
966 case Bytecodes::_astore :
967 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
968 no_control_flow = false; break;
969 case Bytecodes::_astore_0 :
970 case Bytecodes::_astore_1 :
971 case Bytecodes::_astore_2 :
972 case Bytecodes::_astore_3 :
973 index = opcode - Bytecodes::_astore_0;
974 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
975 no_control_flow = false; break;
976 case Bytecodes::_iastore :
977 type = current_frame.pop_stack(
978 VerificationType::integer_type(), CHECK_VERIFY(this));
979 type2 = current_frame.pop_stack(
980 VerificationType::integer_type(), CHECK_VERIFY(this));
981 atype = current_frame.pop_stack(
982 VerificationType::reference_check(), CHECK_VERIFY(this));
983 if (!atype.is_int_array()) {
984 verify_error(ErrorContext::bad_type(bci,
985 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
986 bad_type_msg, "iastore");
987 return;
988 }
989 no_control_flow = false; break;
990 case Bytecodes::_bastore :
991 type = current_frame.pop_stack(
992 VerificationType::integer_type(), CHECK_VERIFY(this));
993 type2 = current_frame.pop_stack(
994 VerificationType::integer_type(), CHECK_VERIFY(this));
995 atype = current_frame.pop_stack(
996 VerificationType::reference_check(), CHECK_VERIFY(this));
997 if (!atype.is_bool_array() && !atype.is_byte_array()) {
998 verify_error(
999 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1000 bad_type_msg, "bastore");
1001 return;
1002 }
1003 no_control_flow = false; break;
1004 case Bytecodes::_castore :
1005 current_frame.pop_stack(
1006 VerificationType::integer_type(), CHECK_VERIFY(this));
1007 current_frame.pop_stack(
1008 VerificationType::integer_type(), CHECK_VERIFY(this));
1009 atype = current_frame.pop_stack(
1010 VerificationType::reference_check(), CHECK_VERIFY(this));
1011 if (!atype.is_char_array()) {
1012 verify_error(ErrorContext::bad_type(bci,
1013 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
1014 bad_type_msg, "castore");
1015 return;
1016 }
1017 no_control_flow = false; break;
1018 case Bytecodes::_sastore :
1019 current_frame.pop_stack(
1020 VerificationType::integer_type(), CHECK_VERIFY(this));
1021 current_frame.pop_stack(
1022 VerificationType::integer_type(), CHECK_VERIFY(this));
1023 atype = current_frame.pop_stack(
1024 VerificationType::reference_check(), CHECK_VERIFY(this));
1025 if (!atype.is_short_array()) {
1026 verify_error(ErrorContext::bad_type(bci,
1027 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1028 bad_type_msg, "sastore");
1029 return;
1030 }
1031 no_control_flow = false; break;
1032 case Bytecodes::_lastore :
1033 current_frame.pop_stack_2(
1034 VerificationType::long2_type(),
1035 VerificationType::long_type(), CHECK_VERIFY(this));
1036 current_frame.pop_stack(
1037 VerificationType::integer_type(), CHECK_VERIFY(this));
1038 atype = current_frame.pop_stack(
1039 VerificationType::reference_check(), CHECK_VERIFY(this));
1040 if (!atype.is_long_array()) {
1041 verify_error(ErrorContext::bad_type(bci,
1042 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1043 bad_type_msg, "lastore");
1044 return;
1045 }
1046 no_control_flow = false; break;
1047 case Bytecodes::_fastore :
1048 current_frame.pop_stack(
1049 VerificationType::float_type(), CHECK_VERIFY(this));
1050 current_frame.pop_stack
1051 (VerificationType::integer_type(), CHECK_VERIFY(this));
1052 atype = current_frame.pop_stack(
1053 VerificationType::reference_check(), CHECK_VERIFY(this));
1054 if (!atype.is_float_array()) {
1055 verify_error(ErrorContext::bad_type(bci,
1056 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1057 bad_type_msg, "fastore");
1058 return;
1059 }
1060 no_control_flow = false; break;
1061 case Bytecodes::_dastore :
1062 current_frame.pop_stack_2(
1063 VerificationType::double2_type(),
1064 VerificationType::double_type(), CHECK_VERIFY(this));
1065 current_frame.pop_stack(
1066 VerificationType::integer_type(), CHECK_VERIFY(this));
1067 atype = current_frame.pop_stack(
1068 VerificationType::reference_check(), CHECK_VERIFY(this));
1069 if (!atype.is_double_array()) {
1070 verify_error(ErrorContext::bad_type(bci,
1071 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1072 bad_type_msg, "dastore");
1073 return;
1074 }
1075 no_control_flow = false; break;
1076 case Bytecodes::_aastore :
1077 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1078 type2 = current_frame.pop_stack(
1079 VerificationType::integer_type(), CHECK_VERIFY(this));
1080 atype = current_frame.pop_stack(
1081 VerificationType::reference_check(), CHECK_VERIFY(this));
1082 // more type-checking is done at runtime
1083 if (!atype.is_reference_array()) {
1084 verify_error(ErrorContext::bad_type(bci,
1085 current_frame.stack_top_ctx(),
1086 TypeOrigin::implicit(VerificationType::reference_check())),
1087 bad_type_msg, "aastore");
1088 return;
1089 }
1090 // 4938384: relaxed constraint in JVMS 3nd edition.
1091 no_control_flow = false; break;
1092 case Bytecodes::_pop :
1093 current_frame.pop_stack(
1094 VerificationType::category1_check(), CHECK_VERIFY(this));
1095 no_control_flow = false; break;
1096 case Bytecodes::_pop2 :
1097 type = current_frame.pop_stack(CHECK_VERIFY(this));
1098 if (type.is_category1()) {
1099 current_frame.pop_stack(
1100 VerificationType::category1_check(), CHECK_VERIFY(this));
1101 } else if (type.is_category2_2nd()) {
1102 current_frame.pop_stack(
1103 VerificationType::category2_check(), CHECK_VERIFY(this));
1104 } else {
1105 /* Unreachable? Would need a category2_1st on TOS
1106 * which does not appear possible. */
1107 verify_error(
1108 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1109 bad_type_msg, "pop2");
1110 return;
1111 }
1112 no_control_flow = false; break;
1113 case Bytecodes::_dup :
1114 type = current_frame.pop_stack(
1115 VerificationType::category1_check(), CHECK_VERIFY(this));
1116 current_frame.push_stack(type, CHECK_VERIFY(this));
1117 current_frame.push_stack(type, CHECK_VERIFY(this));
1118 no_control_flow = false; break;
1119 case Bytecodes::_dup_x1 :
1120 type = current_frame.pop_stack(
1121 VerificationType::category1_check(), CHECK_VERIFY(this));
1122 type2 = current_frame.pop_stack(
1123 VerificationType::category1_check(), CHECK_VERIFY(this));
1124 current_frame.push_stack(type, CHECK_VERIFY(this));
1125 current_frame.push_stack(type2, CHECK_VERIFY(this));
1126 current_frame.push_stack(type, CHECK_VERIFY(this));
1127 no_control_flow = false; break;
1128 case Bytecodes::_dup_x2 :
1129 {
1130 VerificationType type3;
1131 type = current_frame.pop_stack(
1132 VerificationType::category1_check(), CHECK_VERIFY(this));
1133 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1134 if (type2.is_category1()) {
1135 type3 = current_frame.pop_stack(
1136 VerificationType::category1_check(), CHECK_VERIFY(this));
1137 } else if (type2.is_category2_2nd()) {
1138 type3 = current_frame.pop_stack(
1139 VerificationType::category2_check(), CHECK_VERIFY(this));
1140 } else {
1141 /* Unreachable? Would need a category2_1st at stack depth 2 with
1142 * a category1 on TOS which does not appear possible. */
1143 verify_error(ErrorContext::bad_type(
1144 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1145 return;
1146 }
1147 current_frame.push_stack(type, CHECK_VERIFY(this));
1148 current_frame.push_stack(type3, CHECK_VERIFY(this));
1149 current_frame.push_stack(type2, CHECK_VERIFY(this));
1150 current_frame.push_stack(type, CHECK_VERIFY(this));
1151 no_control_flow = false; break;
1152 }
1153 case Bytecodes::_dup2 :
1154 type = current_frame.pop_stack(CHECK_VERIFY(this));
1155 if (type.is_category1()) {
1156 type2 = current_frame.pop_stack(
1157 VerificationType::category1_check(), CHECK_VERIFY(this));
1158 } else if (type.is_category2_2nd()) {
1159 type2 = current_frame.pop_stack(
1160 VerificationType::category2_check(), CHECK_VERIFY(this));
1161 } else {
1162 /* Unreachable? Would need a category2_1st on TOS which does not
1163 * appear possible. */
1164 verify_error(
1165 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1166 bad_type_msg, "dup2");
1167 return;
1168 }
1169 current_frame.push_stack(type2, CHECK_VERIFY(this));
1170 current_frame.push_stack(type, CHECK_VERIFY(this));
1171 current_frame.push_stack(type2, CHECK_VERIFY(this));
1172 current_frame.push_stack(type, CHECK_VERIFY(this));
1173 no_control_flow = false; break;
1174 case Bytecodes::_dup2_x1 :
1175 {
1176 VerificationType type3;
1177 type = current_frame.pop_stack(CHECK_VERIFY(this));
1178 if (type.is_category1()) {
1179 type2 = current_frame.pop_stack(
1180 VerificationType::category1_check(), CHECK_VERIFY(this));
1181 } else if (type.is_category2_2nd()) {
1182 type2 = current_frame.pop_stack(
1183 VerificationType::category2_check(), CHECK_VERIFY(this));
1184 } else {
1185 /* Unreachable? Would need a category2_1st on TOS which does
1186 * not appear possible. */
1187 verify_error(
1188 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1189 bad_type_msg, "dup2_x1");
1190 return;
1191 }
1192 type3 = current_frame.pop_stack(
1193 VerificationType::category1_check(), CHECK_VERIFY(this));
1194 current_frame.push_stack(type2, CHECK_VERIFY(this));
1195 current_frame.push_stack(type, CHECK_VERIFY(this));
1196 current_frame.push_stack(type3, CHECK_VERIFY(this));
1197 current_frame.push_stack(type2, CHECK_VERIFY(this));
1198 current_frame.push_stack(type, CHECK_VERIFY(this));
1199 no_control_flow = false; break;
1200 }
1201 case Bytecodes::_dup2_x2 :
1202 {
1203 VerificationType type3, type4;
1204 type = current_frame.pop_stack(CHECK_VERIFY(this));
1205 if (type.is_category1()) {
1206 type2 = current_frame.pop_stack(
1207 VerificationType::category1_check(), CHECK_VERIFY(this));
1208 } else if (type.is_category2_2nd()) {
1209 type2 = current_frame.pop_stack(
1210 VerificationType::category2_check(), CHECK_VERIFY(this));
1211 } else {
1212 /* Unreachable? Would need a category2_1st on TOS which does
1213 * not appear possible. */
1214 verify_error(
1215 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1216 bad_type_msg, "dup2_x2");
1217 return;
1218 }
1219 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1220 if (type3.is_category1()) {
1221 type4 = current_frame.pop_stack(
1222 VerificationType::category1_check(), CHECK_VERIFY(this));
1223 } else if (type3.is_category2_2nd()) {
1224 type4 = current_frame.pop_stack(
1225 VerificationType::category2_check(), CHECK_VERIFY(this));
1226 } else {
1227 /* Unreachable? Would need a category2_1st on TOS after popping
1228 * a long/double or two category 1's, which does not
1229 * appear possible. */
1230 verify_error(
1231 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1232 bad_type_msg, "dup2_x2");
1233 return;
1234 }
1235 current_frame.push_stack(type2, CHECK_VERIFY(this));
1236 current_frame.push_stack(type, CHECK_VERIFY(this));
1237 current_frame.push_stack(type4, CHECK_VERIFY(this));
1238 current_frame.push_stack(type3, CHECK_VERIFY(this));
1239 current_frame.push_stack(type2, CHECK_VERIFY(this));
1240 current_frame.push_stack(type, CHECK_VERIFY(this));
1241 no_control_flow = false; break;
1242 }
1243 case Bytecodes::_swap :
1244 type = current_frame.pop_stack(
1245 VerificationType::category1_check(), CHECK_VERIFY(this));
1246 type2 = current_frame.pop_stack(
1247 VerificationType::category1_check(), CHECK_VERIFY(this));
1248 current_frame.push_stack(type, CHECK_VERIFY(this));
1249 current_frame.push_stack(type2, CHECK_VERIFY(this));
1250 no_control_flow = false; break;
1251 case Bytecodes::_iadd :
1252 case Bytecodes::_isub :
1253 case Bytecodes::_imul :
1254 case Bytecodes::_idiv :
1255 case Bytecodes::_irem :
1256 case Bytecodes::_ishl :
1257 case Bytecodes::_ishr :
1258 case Bytecodes::_iushr :
1259 case Bytecodes::_ior :
1260 case Bytecodes::_ixor :
1261 case Bytecodes::_iand :
1262 current_frame.pop_stack(
1263 VerificationType::integer_type(), CHECK_VERIFY(this));
1264 // fall through
1265 case Bytecodes::_ineg :
1266 current_frame.pop_stack(
1267 VerificationType::integer_type(), CHECK_VERIFY(this));
1268 current_frame.push_stack(
1269 VerificationType::integer_type(), CHECK_VERIFY(this));
1270 no_control_flow = false; break;
1271 case Bytecodes::_ladd :
1272 case Bytecodes::_lsub :
1273 case Bytecodes::_lmul :
1274 case Bytecodes::_ldiv :
1275 case Bytecodes::_lrem :
1276 case Bytecodes::_land :
1277 case Bytecodes::_lor :
1278 case Bytecodes::_lxor :
1279 current_frame.pop_stack_2(
1280 VerificationType::long2_type(),
1281 VerificationType::long_type(), CHECK_VERIFY(this));
1282 // fall through
1283 case Bytecodes::_lneg :
1284 current_frame.pop_stack_2(
1285 VerificationType::long2_type(),
1286 VerificationType::long_type(), CHECK_VERIFY(this));
1287 current_frame.push_stack_2(
1288 VerificationType::long_type(),
1289 VerificationType::long2_type(), CHECK_VERIFY(this));
1290 no_control_flow = false; break;
1291 case Bytecodes::_lshl :
1292 case Bytecodes::_lshr :
1293 case Bytecodes::_lushr :
1294 current_frame.pop_stack(
1295 VerificationType::integer_type(), CHECK_VERIFY(this));
1296 current_frame.pop_stack_2(
1297 VerificationType::long2_type(),
1298 VerificationType::long_type(), CHECK_VERIFY(this));
1299 current_frame.push_stack_2(
1300 VerificationType::long_type(),
1301 VerificationType::long2_type(), CHECK_VERIFY(this));
1302 no_control_flow = false; break;
1303 case Bytecodes::_fadd :
1304 case Bytecodes::_fsub :
1305 case Bytecodes::_fmul :
1306 case Bytecodes::_fdiv :
1307 case Bytecodes::_frem :
1308 current_frame.pop_stack(
1309 VerificationType::float_type(), CHECK_VERIFY(this));
1310 // fall through
1311 case Bytecodes::_fneg :
1312 current_frame.pop_stack(
1313 VerificationType::float_type(), CHECK_VERIFY(this));
1314 current_frame.push_stack(
1315 VerificationType::float_type(), CHECK_VERIFY(this));
1316 no_control_flow = false; break;
1317 case Bytecodes::_dadd :
1318 case Bytecodes::_dsub :
1319 case Bytecodes::_dmul :
1320 case Bytecodes::_ddiv :
1321 case Bytecodes::_drem :
1322 current_frame.pop_stack_2(
1323 VerificationType::double2_type(),
1324 VerificationType::double_type(), CHECK_VERIFY(this));
1325 // fall through
1326 case Bytecodes::_dneg :
1327 current_frame.pop_stack_2(
1328 VerificationType::double2_type(),
1329 VerificationType::double_type(), CHECK_VERIFY(this));
1330 current_frame.push_stack_2(
1331 VerificationType::double_type(),
1332 VerificationType::double2_type(), CHECK_VERIFY(this));
1333 no_control_flow = false; break;
1334 case Bytecodes::_iinc :
1335 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1336 no_control_flow = false; break;
1337 case Bytecodes::_i2l :
1338 type = current_frame.pop_stack(
1339 VerificationType::integer_type(), CHECK_VERIFY(this));
1340 current_frame.push_stack_2(
1341 VerificationType::long_type(),
1342 VerificationType::long2_type(), CHECK_VERIFY(this));
1343 no_control_flow = false; break;
1344 case Bytecodes::_l2i :
1345 current_frame.pop_stack_2(
1346 VerificationType::long2_type(),
1347 VerificationType::long_type(), CHECK_VERIFY(this));
1348 current_frame.push_stack(
1349 VerificationType::integer_type(), CHECK_VERIFY(this));
1350 no_control_flow = false; break;
1351 case Bytecodes::_i2f :
1352 current_frame.pop_stack(
1353 VerificationType::integer_type(), CHECK_VERIFY(this));
1354 current_frame.push_stack(
1355 VerificationType::float_type(), CHECK_VERIFY(this));
1356 no_control_flow = false; break;
1357 case Bytecodes::_i2d :
1358 current_frame.pop_stack(
1359 VerificationType::integer_type(), CHECK_VERIFY(this));
1360 current_frame.push_stack_2(
1361 VerificationType::double_type(),
1362 VerificationType::double2_type(), CHECK_VERIFY(this));
1363 no_control_flow = false; break;
1364 case Bytecodes::_l2f :
1365 current_frame.pop_stack_2(
1366 VerificationType::long2_type(),
1367 VerificationType::long_type(), CHECK_VERIFY(this));
1368 current_frame.push_stack(
1369 VerificationType::float_type(), CHECK_VERIFY(this));
1370 no_control_flow = false; break;
1371 case Bytecodes::_l2d :
1372 current_frame.pop_stack_2(
1373 VerificationType::long2_type(),
1374 VerificationType::long_type(), CHECK_VERIFY(this));
1375 current_frame.push_stack_2(
1376 VerificationType::double_type(),
1377 VerificationType::double2_type(), CHECK_VERIFY(this));
1378 no_control_flow = false; break;
1379 case Bytecodes::_f2i :
1380 current_frame.pop_stack(
1381 VerificationType::float_type(), CHECK_VERIFY(this));
1382 current_frame.push_stack(
1383 VerificationType::integer_type(), CHECK_VERIFY(this));
1384 no_control_flow = false; break;
1385 case Bytecodes::_f2l :
1386 current_frame.pop_stack(
1387 VerificationType::float_type(), CHECK_VERIFY(this));
1388 current_frame.push_stack_2(
1389 VerificationType::long_type(),
1390 VerificationType::long2_type(), CHECK_VERIFY(this));
1391 no_control_flow = false; break;
1392 case Bytecodes::_f2d :
1393 current_frame.pop_stack(
1394 VerificationType::float_type(), CHECK_VERIFY(this));
1395 current_frame.push_stack_2(
1396 VerificationType::double_type(),
1397 VerificationType::double2_type(), CHECK_VERIFY(this));
1398 no_control_flow = false; break;
1399 case Bytecodes::_d2i :
1400 current_frame.pop_stack_2(
1401 VerificationType::double2_type(),
1402 VerificationType::double_type(), CHECK_VERIFY(this));
1403 current_frame.push_stack(
1404 VerificationType::integer_type(), CHECK_VERIFY(this));
1405 no_control_flow = false; break;
1406 case Bytecodes::_d2l :
1407 current_frame.pop_stack_2(
1408 VerificationType::double2_type(),
1409 VerificationType::double_type(), CHECK_VERIFY(this));
1410 current_frame.push_stack_2(
1411 VerificationType::long_type(),
1412 VerificationType::long2_type(), CHECK_VERIFY(this));
1413 no_control_flow = false; break;
1414 case Bytecodes::_d2f :
1415 current_frame.pop_stack_2(
1416 VerificationType::double2_type(),
1417 VerificationType::double_type(), CHECK_VERIFY(this));
1418 current_frame.push_stack(
1419 VerificationType::float_type(), CHECK_VERIFY(this));
1420 no_control_flow = false; break;
1421 case Bytecodes::_i2b :
1422 case Bytecodes::_i2c :
1423 case Bytecodes::_i2s :
1424 current_frame.pop_stack(
1425 VerificationType::integer_type(), CHECK_VERIFY(this));
1426 current_frame.push_stack(
1427 VerificationType::integer_type(), CHECK_VERIFY(this));
1428 no_control_flow = false; break;
1429 case Bytecodes::_lcmp :
1430 current_frame.pop_stack_2(
1431 VerificationType::long2_type(),
1432 VerificationType::long_type(), CHECK_VERIFY(this));
1433 current_frame.pop_stack_2(
1434 VerificationType::long2_type(),
1435 VerificationType::long_type(), CHECK_VERIFY(this));
1436 current_frame.push_stack(
1437 VerificationType::integer_type(), CHECK_VERIFY(this));
1438 no_control_flow = false; break;
1439 case Bytecodes::_fcmpl :
1440 case Bytecodes::_fcmpg :
1441 current_frame.pop_stack(
1442 VerificationType::float_type(), CHECK_VERIFY(this));
1443 current_frame.pop_stack(
1444 VerificationType::float_type(), CHECK_VERIFY(this));
1445 current_frame.push_stack(
1446 VerificationType::integer_type(), CHECK_VERIFY(this));
1447 no_control_flow = false; break;
1448 case Bytecodes::_dcmpl :
1449 case Bytecodes::_dcmpg :
1450 current_frame.pop_stack_2(
1451 VerificationType::double2_type(),
1452 VerificationType::double_type(), CHECK_VERIFY(this));
1453 current_frame.pop_stack_2(
1454 VerificationType::double2_type(),
1455 VerificationType::double_type(), CHECK_VERIFY(this));
1456 current_frame.push_stack(
1457 VerificationType::integer_type(), CHECK_VERIFY(this));
1458 no_control_flow = false; break;
1459 case Bytecodes::_if_icmpeq:
1460 case Bytecodes::_if_icmpne:
1461 case Bytecodes::_if_icmplt:
1462 case Bytecodes::_if_icmpge:
1463 case Bytecodes::_if_icmpgt:
1464 case Bytecodes::_if_icmple:
1465 current_frame.pop_stack(
1466 VerificationType::integer_type(), CHECK_VERIFY(this));
1467 // fall through
1468 case Bytecodes::_ifeq:
1469 case Bytecodes::_ifne:
1470 case Bytecodes::_iflt:
1471 case Bytecodes::_ifge:
1472 case Bytecodes::_ifgt:
1473 case Bytecodes::_ifle:
1474 current_frame.pop_stack(
1475 VerificationType::integer_type(), CHECK_VERIFY(this));
1476 target = bcs.dest();
1477 stackmap_table.check_jump_target(
1478 ¤t_frame, target, CHECK_VERIFY(this));
1479 no_control_flow = false; break;
1480 case Bytecodes::_if_acmpeq :
1481 case Bytecodes::_if_acmpne :
1482 current_frame.pop_stack(
1483 VerificationType::reference_check(), CHECK_VERIFY(this));
1484 // fall through
1485 case Bytecodes::_ifnull :
1486 case Bytecodes::_ifnonnull :
1487 current_frame.pop_stack(
1488 VerificationType::reference_check(), CHECK_VERIFY(this));
1489 target = bcs.dest();
1490 stackmap_table.check_jump_target
1491 (¤t_frame, target, CHECK_VERIFY(this));
1492 no_control_flow = false; break;
1493 case Bytecodes::_goto :
1494 target = bcs.dest();
1495 stackmap_table.check_jump_target(
1496 ¤t_frame, target, CHECK_VERIFY(this));
1497 no_control_flow = true; break;
1498 case Bytecodes::_goto_w :
1499 target = bcs.dest_w();
1500 stackmap_table.check_jump_target(
1501 ¤t_frame, target, CHECK_VERIFY(this));
1502 no_control_flow = true; break;
1503 case Bytecodes::_tableswitch :
1504 case Bytecodes::_lookupswitch :
1505 verify_switch(
1506 &bcs, code_length, code_data, ¤t_frame,
1507 &stackmap_table, CHECK_VERIFY(this));
1508 no_control_flow = true; break;
1509 case Bytecodes::_ireturn :
1510 type = current_frame.pop_stack(
1511 VerificationType::integer_type(), CHECK_VERIFY(this));
1512 verify_return_value(return_type, type, bci,
1513 ¤t_frame, CHECK_VERIFY(this));
1514 no_control_flow = true; break;
1515 case Bytecodes::_lreturn :
1516 type2 = current_frame.pop_stack(
1517 VerificationType::long2_type(), CHECK_VERIFY(this));
1518 type = current_frame.pop_stack(
1519 VerificationType::long_type(), CHECK_VERIFY(this));
1520 verify_return_value(return_type, type, bci,
1521 ¤t_frame, CHECK_VERIFY(this));
1522 no_control_flow = true; break;
1523 case Bytecodes::_freturn :
1524 type = current_frame.pop_stack(
1525 VerificationType::float_type(), CHECK_VERIFY(this));
1526 verify_return_value(return_type, type, bci,
1527 ¤t_frame, CHECK_VERIFY(this));
1528 no_control_flow = true; break;
1529 case Bytecodes::_dreturn :
1530 type2 = current_frame.pop_stack(
1531 VerificationType::double2_type(), CHECK_VERIFY(this));
1532 type = current_frame.pop_stack(
1533 VerificationType::double_type(), CHECK_VERIFY(this));
1534 verify_return_value(return_type, type, bci,
1535 ¤t_frame, CHECK_VERIFY(this));
1536 no_control_flow = true; break;
1537 case Bytecodes::_areturn :
1538 type = current_frame.pop_stack(
1539 VerificationType::reference_check(), CHECK_VERIFY(this));
1540 verify_return_value(return_type, type, bci,
1541 ¤t_frame, CHECK_VERIFY(this));
1542 no_control_flow = true; break;
1543 case Bytecodes::_return :
1544 if (return_type != VerificationType::bogus_type()) {
1545 verify_error(ErrorContext::bad_code(bci),
1546 "Method expects a return value");
1547 return;
1548 }
1549 // Make sure "this" has been initialized if current method is an
1550 // <init>
1551 if (_method->name() == vmSymbols::object_initializer_name() &&
1552 current_frame.flag_this_uninit()) {
1553 verify_error(ErrorContext::bad_code(bci),
1554 "Constructor must call super() or this() "
1555 "before return");
1556 return;
1557 }
1558 no_control_flow = true; break;
1559 case Bytecodes::_getstatic :
1560 case Bytecodes::_putstatic :
1561 // pass TRUE, operand can be an array type for getstatic/putstatic.
1562 verify_field_instructions(
1563 &bcs, ¤t_frame, cp, true, CHECK_VERIFY(this));
1564 no_control_flow = false; break;
1565 case Bytecodes::_getfield :
1566 case Bytecodes::_putfield :
1567 // pass FALSE, operand can't be an array type for getfield/putfield.
1568 verify_field_instructions(
1569 &bcs, ¤t_frame, cp, false, CHECK_VERIFY(this));
1570 no_control_flow = false; break;
1571 case Bytecodes::_invokevirtual :
1572 case Bytecodes::_invokespecial :
1573 case Bytecodes::_invokestatic :
1574 verify_invoke_instructions(
1575 &bcs, code_length, ¤t_frame, (bci >= ex_min && bci < ex_max),
1576 &this_uninit, return_type, cp, &stackmap_table, CHECK_VERIFY(this));
1577 no_control_flow = false; break;
1578 case Bytecodes::_invokeinterface :
1579 case Bytecodes::_invokedynamic :
1580 verify_invoke_instructions(
1581 &bcs, code_length, ¤t_frame, (bci >= ex_min && bci < ex_max),
1582 &this_uninit, return_type, cp, &stackmap_table, CHECK_VERIFY(this));
1583 no_control_flow = false; break;
1584 case Bytecodes::_new :
1585 {
1586 index = bcs.get_index_u2();
1587 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1588 VerificationType new_class_type =
1589 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1590 if (!new_class_type.is_object()) {
1591 verify_error(ErrorContext::bad_type(bci,
1592 TypeOrigin::cp(index, new_class_type)),
1593 "Illegal new instruction");
1594 return;
1595 }
1596 type = VerificationType::uninitialized_type(bci);
1597 current_frame.push_stack(type, CHECK_VERIFY(this));
1598 no_control_flow = false; break;
1599 }
1600 case Bytecodes::_newarray :
1601 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1602 current_frame.pop_stack(
1603 VerificationType::integer_type(), CHECK_VERIFY(this));
1604 current_frame.push_stack(type, CHECK_VERIFY(this));
1605 no_control_flow = false; break;
1606 case Bytecodes::_anewarray :
1607 verify_anewarray(
1608 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1609 no_control_flow = false; break;
1610 case Bytecodes::_arraylength :
1611 type = current_frame.pop_stack(
1612 VerificationType::reference_check(), CHECK_VERIFY(this));
1613 if (!(type.is_null() || type.is_array())) {
1614 verify_error(ErrorContext::bad_type(
1615 bci, current_frame.stack_top_ctx()),
1616 bad_type_msg, "arraylength");
1617 }
1618 current_frame.push_stack(
1619 VerificationType::integer_type(), CHECK_VERIFY(this));
1620 no_control_flow = false; break;
1621 case Bytecodes::_checkcast :
1622 {
1623 index = bcs.get_index_u2();
1624 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1625 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1626 VerificationType klass_type = cp_index_to_type(
1627 index, cp, CHECK_VERIFY(this));
1628 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1629 no_control_flow = false; break;
1630 }
1631 case Bytecodes::_instanceof : {
1632 index = bcs.get_index_u2();
1633 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1634 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1635 current_frame.push_stack(
1636 VerificationType::integer_type(), CHECK_VERIFY(this));
1637 no_control_flow = false; break;
1638 }
1639 case Bytecodes::_monitorenter :
1640 case Bytecodes::_monitorexit :
1641 current_frame.pop_stack(
1642 VerificationType::reference_check(), CHECK_VERIFY(this));
1643 no_control_flow = false; break;
1644 case Bytecodes::_multianewarray :
1645 {
1646 index = bcs.get_index_u2();
1647 u2 dim = *(bcs.bcp()+3);
1648 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1649 VerificationType new_array_type =
1650 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1651 if (!new_array_type.is_array()) {
1652 verify_error(ErrorContext::bad_type(bci,
1653 TypeOrigin::cp(index, new_array_type)),
1654 "Illegal constant pool index in multianewarray instruction");
1655 return;
1656 }
1657 if (dim < 1 || new_array_type.dimensions() < dim) {
1658 verify_error(ErrorContext::bad_code(bci),
1659 "Illegal dimension in multianewarray instruction: %d", dim);
1660 return;
1661 }
1662 for (int i = 0; i < dim; i++) {
1663 current_frame.pop_stack(
1664 VerificationType::integer_type(), CHECK_VERIFY(this));
1665 }
1666 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1667 no_control_flow = false; break;
1668 }
1669 case Bytecodes::_athrow :
1670 type = VerificationType::reference_type(
1671 vmSymbols::java_lang_Throwable());
1672 current_frame.pop_stack(type, CHECK_VERIFY(this));
1673 no_control_flow = true; break;
1674 default:
1675 // We only need to check the valid bytecodes in class file.
1676 // And jsr and ret are not in the new class file format in JDK1.5.
1677 verify_error(ErrorContext::bad_code(bci),
1678 "Bad instruction: %02x", opcode);
1679 no_control_flow = false;
1680 return;
1681 } // end switch
1682 } // end Merge with the next instruction
1683
1684 // Look for possible jump target in exception handlers and see if it matches
1685 // current_frame. Don't do this check if it has already been done (for
1686 // astore* opcodes). This check cannot be done earlier because opcodes,
1687 // such as invokespecial, may set the this_uninit flag.
1688 assert(!(verified_exc_handlers && this_uninit),
1689 "Exception handler targets got verified before this_uninit got set");
1690 if (!verified_exc_handlers && bci >= ex_min && bci < ex_max) {
1691 verify_exception_handler_targets(
1692 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1693 }
1694 } // end while
1695
1696 // Make sure that control flow does not fall through end of the method
1697 if (!no_control_flow) {
1698 verify_error(ErrorContext::bad_code(code_length),
1699 "Control flow falls through code end");
1700 return;
1701 }
1702 }
1703
1704 #undef bad_type_message
1705
1706 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1707 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1708 memset(code_data, 0, sizeof(char) * code_length);
1709 RawBytecodeStream bcs(m);
1710
1711 while (!bcs.is_last_bytecode()) {
1712 if (bcs.raw_next() != Bytecodes::_illegal) {
1713 int bci = bcs.bci();
1714 if (bcs.raw_code() == Bytecodes::_new) {
1715 code_data[bci] = NEW_OFFSET;
1716 } else {
1717 code_data[bci] = BYTECODE_OFFSET;
1718 }
1719 } else {
1720 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1721 return NULL;
1722 }
1723 }
1724
1725 return code_data;
1726 }
1727
1728 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1729 ExceptionTable exhandlers(_method());
1730 int exlength = exhandlers.length();
1731 constantPoolHandle cp (THREAD, _method->constants());
1732
1733 for(int i = 0; i < exlength; i++) {
1734 u2 start_pc = exhandlers.start_pc(i);
1735 u2 end_pc = exhandlers.end_pc(i);
1736 u2 handler_pc = exhandlers.handler_pc(i);
1737 if (start_pc >= code_length || code_data[start_pc] == 0) {
1738 class_format_error("Illegal exception table start_pc %d", start_pc);
1739 return;
1740 }
1741 if (end_pc != code_length) { // special case: end_pc == code_length
1742 if (end_pc > code_length || code_data[end_pc] == 0) {
1743 class_format_error("Illegal exception table end_pc %d", end_pc);
1744 return;
1745 }
1746 }
1747 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1748 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1749 return;
1750 }
1751 int catch_type_index = exhandlers.catch_type_index(i);
1752 if (catch_type_index != 0) {
1753 VerificationType catch_type = cp_index_to_type(
1754 catch_type_index, cp, CHECK_VERIFY(this));
1755 VerificationType throwable =
1756 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1757 bool is_subclass = throwable.is_assignable_from(
1758 catch_type, this, false, CHECK_VERIFY(this));
1759 if (!is_subclass) {
1760 // 4286534: should throw VerifyError according to recent spec change
1761 verify_error(ErrorContext::bad_type(handler_pc,
1762 TypeOrigin::cp(catch_type_index, catch_type),
1763 TypeOrigin::implicit(throwable)),
1764 "Catch type is not a subclass "
1765 "of Throwable in exception handler %d", handler_pc);
1766 return;
1767 }
1768 }
1769 if (start_pc < min) min = start_pc;
1770 if (end_pc > max) max = end_pc;
1771 }
1772 }
1773
1774 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1775 int localvariable_table_length = _method()->localvariable_table_length();
1776 if (localvariable_table_length > 0) {
1777 LocalVariableTableElement* table = _method()->localvariable_table_start();
1778 for (int i = 0; i < localvariable_table_length; i++) {
1779 u2 start_bci = table[i].start_bci;
1780 u2 length = table[i].length;
1781
1782 if (start_bci >= code_length || code_data[start_bci] == 0) {
1783 class_format_error(
1784 "Illegal local variable table start_pc %d", start_bci);
1785 return;
1786 }
1787 u4 end_bci = (u4)(start_bci + length);
1788 if (end_bci != code_length) {
1789 if (end_bci >= code_length || code_data[end_bci] == 0) {
1790 class_format_error( "Illegal local variable table length %d", length);
1791 return;
1792 }
1793 }
1794 }
1795 }
1796 }
1797
1798 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1799 StackMapFrame* current_frame,
1800 StackMapTable* stackmap_table,
1801 bool no_control_flow, TRAPS) {
1802 if (stackmap_index < stackmap_table->get_frame_count()) {
1803 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1804 if (no_control_flow && this_offset > bci) {
1805 verify_error(ErrorContext::missing_stackmap(bci),
1806 "Expecting a stack map frame");
1807 return 0;
1808 }
1809 if (this_offset == bci) {
1810 ErrorContext ctx;
1811 // See if current stack map can be assigned to the frame in table.
1812 // current_frame is the stackmap frame got from the last instruction.
1813 // If matched, current_frame will be updated by this method.
1814 bool matches = stackmap_table->match_stackmap(
1815 current_frame, this_offset, stackmap_index,
1816 !no_control_flow, true, false, &ctx, CHECK_VERIFY_(this, 0));
1817 if (!matches) {
1818 // report type error
1819 verify_error(ctx, "Instruction type does not match stack map");
1820 return 0;
1821 }
1822 stackmap_index++;
1823 } else if (this_offset < bci) {
1824 // current_offset should have met this_offset.
1825 class_format_error("Bad stack map offset %d", this_offset);
1826 return 0;
1827 }
1828 } else if (no_control_flow) {
1829 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1830 return 0;
1831 }
1832 return stackmap_index;
1833 }
1834
1835 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1836 StackMapTable* stackmap_table, TRAPS) {
1837 constantPoolHandle cp (THREAD, _method->constants());
1838 ExceptionTable exhandlers(_method());
1839 int exlength = exhandlers.length();
1840 for(int i = 0; i < exlength; i++) {
1841 u2 start_pc = exhandlers.start_pc(i);
1842 u2 end_pc = exhandlers.end_pc(i);
1843 u2 handler_pc = exhandlers.handler_pc(i);
1844 int catch_type_index = exhandlers.catch_type_index(i);
1845 if(bci >= start_pc && bci < end_pc) {
1846 u1 flags = current_frame->flags();
1847 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1848 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1849 if (catch_type_index != 0) {
1850 // We know that this index refers to a subclass of Throwable
1851 VerificationType catch_type = cp_index_to_type(
1852 catch_type_index, cp, CHECK_VERIFY(this));
1853 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1854 } else {
1855 VerificationType throwable =
1856 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1857 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1858 }
1859 ErrorContext ctx;
1860 bool matches = stackmap_table->match_stackmap(
1861 new_frame, handler_pc, true, false, true, &ctx, CHECK_VERIFY(this));
1862 if (!matches) {
1863 verify_error(ctx, "Stack map does not match the one at "
1864 "exception handler %d", handler_pc);
1865 return;
1866 }
1867 }
1868 }
1869 }
1870
1871 void ClassVerifier::verify_cp_index(
1872 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1873 int nconstants = cp->length();
1874 if ((index <= 0) || (index >= nconstants)) {
1875 verify_error(ErrorContext::bad_cp_index(bci, index),
1876 "Illegal constant pool index %d in class %s",
1877 index, cp->pool_holder()->external_name());
1878 return;
1879 }
1880 }
1881
1882 void ClassVerifier::verify_cp_type(
1883 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1884
1885 // In some situations, bytecode rewriting may occur while we're verifying.
1886 // In this case, a constant pool cache exists and some indices refer to that
1887 // instead. Be sure we don't pick up such indices by accident.
1888 // We must check was_recursively_verified() before we get here.
1889 guarantee(cp->cache() == NULL, "not rewritten yet");
1890
1891 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1892 unsigned int tag = cp->tag_at(index).value();
1893 if ((types & (1 << tag)) == 0) {
1894 verify_error(ErrorContext::bad_cp_index(bci, index),
1895 "Illegal type at constant pool entry %d in class %s",
1896 index, cp->pool_holder()->external_name());
1897 return;
1898 }
1899 }
1900
1901 void ClassVerifier::verify_cp_class_type(
1902 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1903 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1904 constantTag tag = cp->tag_at(index);
1905 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1906 verify_error(ErrorContext::bad_cp_index(bci, index),
1907 "Illegal type at constant pool entry %d in class %s",
1908 index, cp->pool_holder()->external_name());
1909 return;
1910 }
1911 }
1912
1913 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1914 stringStream ss;
1915
1916 ctx.reset_frames();
1917 _exception_type = vmSymbols::java_lang_VerifyError();
1918 _error_context = ctx;
1919 va_list va;
1920 va_start(va, msg);
1921 ss.vprint(msg, va);
1922 va_end(va);
1923 _message = ss.as_string();
1924 #ifdef ASSERT
1925 ResourceMark rm;
1926 const char* exception_name = _exception_type->as_C_string();
1927 Exceptions::debug_check_abort(exception_name, NULL);
1928 #endif // ndef ASSERT
1929 }
1930
1931 void ClassVerifier::class_format_error(const char* msg, ...) {
1932 stringStream ss;
1933 _exception_type = vmSymbols::java_lang_ClassFormatError();
1934 va_list va;
1935 va_start(va, msg);
1936 ss.vprint(msg, va);
1937 va_end(va);
1938 if (!_method.is_null()) {
1939 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1940 }
1941 _message = ss.as_string();
1942 }
1943
1944 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1945 // Get current loader and protection domain first.
1946 oop loader = current_class()->class_loader();
1947 oop protection_domain = current_class()->protection_domain();
1948
1949 return SystemDictionary::resolve_or_fail(
1950 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1951 true, THREAD);
1952 }
1953
1954 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1955 Klass* target_class,
1956 Symbol* field_name,
1957 Symbol* field_sig,
1958 bool is_method) {
1959 No_Safepoint_Verifier nosafepoint;
1960
1961 // If target class isn't a super class of this class, we don't worry about this case
1962 if (!this_class->is_subclass_of(target_class)) {
1963 return false;
1964 }
1965 // Check if the specified method or field is protected
1966 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1967 fieldDescriptor fd;
1968 if (is_method) {
1969 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::find_overpass);
1970 if (m != NULL && m->is_protected()) {
1971 if (!this_class->is_same_class_package(m->method_holder())) {
1972 return true;
1973 }
1974 }
1975 } else {
1976 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1977 if (member_klass != NULL && fd.is_protected()) {
1978 if (!this_class->is_same_class_package(member_klass)) {
1979 return true;
1980 }
1981 }
1982 }
1983 return false;
1984 }
1985
1986 void ClassVerifier::verify_ldc(
1987 int opcode, u2 index, StackMapFrame* current_frame,
1988 constantPoolHandle cp, u2 bci, TRAPS) {
1989 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1990 constantTag tag = cp->tag_at(index);
1991 unsigned int types;
1992 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1993 if (!tag.is_unresolved_klass()) {
1994 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1995 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1996 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1997 // Note: The class file parser already verified the legality of
1998 // MethodHandle and MethodType constants.
1999 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2000 }
2001 } else {
2002 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
2003 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
2004 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2005 }
2006 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
2007 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
2008 } else if (tag.is_string()) {
2009 current_frame->push_stack(
2010 VerificationType::reference_type(
2011 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
2012 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
2013 current_frame->push_stack(
2014 VerificationType::reference_type(
2015 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
2016 } else if (tag.is_int()) {
2017 current_frame->push_stack(
2018 VerificationType::integer_type(), CHECK_VERIFY(this));
2019 } else if (tag.is_float()) {
2020 current_frame->push_stack(
2021 VerificationType::float_type(), CHECK_VERIFY(this));
2022 } else if (tag.is_double()) {
2023 current_frame->push_stack_2(
2024 VerificationType::double_type(),
2025 VerificationType::double2_type(), CHECK_VERIFY(this));
2026 } else if (tag.is_long()) {
2027 current_frame->push_stack_2(
2028 VerificationType::long_type(),
2029 VerificationType::long2_type(), CHECK_VERIFY(this));
2030 } else if (tag.is_method_handle()) {
2031 current_frame->push_stack(
2032 VerificationType::reference_type(
2033 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2034 } else if (tag.is_method_type()) {
2035 current_frame->push_stack(
2036 VerificationType::reference_type(
2037 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2038 } else {
2039 /* Unreachable? verify_cp_type has already validated the cp type. */
2040 verify_error(
2041 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2042 return;
2043 }
2044 }
2045
2046 void ClassVerifier::verify_switch(
2047 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2048 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2049 int bci = bcs->bci();
2050 address bcp = bcs->bcp();
2051 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2052
2053 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2054 // 4639449 & 4647081: padding bytes must be 0
2055 u2 padding_offset = 1;
2056 while ((bcp + padding_offset) < aligned_bcp) {
2057 if(*(bcp + padding_offset) != 0) {
2058 verify_error(ErrorContext::bad_code(bci),
2059 "Nonzero padding byte in lookupswitch or tableswitch");
2060 return;
2061 }
2062 padding_offset++;
2063 }
2064 }
2065
2066 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2067 int keys, delta;
2068 current_frame->pop_stack(
2069 VerificationType::integer_type(), CHECK_VERIFY(this));
2070 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2071 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2072 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2073 if (low > high) {
2074 verify_error(ErrorContext::bad_code(bci),
2075 "low must be less than or equal to high in tableswitch");
2076 return;
2077 }
2078 keys = high - low + 1;
2079 if (keys < 0) {
2080 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2081 return;
2082 }
2083 delta = 1;
2084 } else {
2085 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2086 if (keys < 0) {
2087 verify_error(ErrorContext::bad_code(bci),
2088 "number of keys in lookupswitch less than 0");
2089 return;
2090 }
2091 delta = 2;
2092 // Make sure that the lookupswitch items are sorted
2093 for (int i = 0; i < (keys - 1); i++) {
2094 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2095 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2096 if (this_key >= next_key) {
2097 verify_error(ErrorContext::bad_code(bci),
2098 "Bad lookupswitch instruction");
2099 return;
2100 }
2101 }
2102 }
2103 int target = bci + default_offset;
2104 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2105 for (int i = 0; i < keys; i++) {
2106 // Because check_jump_target() may safepoint, the bytecode could have
2107 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2108 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2109 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2110 stackmap_table->check_jump_target(
2111 current_frame, target, CHECK_VERIFY(this));
2112 }
2113 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2114 }
2115
2116 bool ClassVerifier::name_in_supers(
2117 Symbol* ref_name, instanceKlassHandle current) {
2118 Klass* super = current->super();
2119 while (super != NULL) {
2120 if (super->name() == ref_name) {
2121 return true;
2122 }
2123 super = super->super();
2124 }
2125 return false;
2126 }
2127
2128 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2129 StackMapFrame* current_frame,
2130 constantPoolHandle cp,
2131 bool allow_arrays,
2132 TRAPS) {
2133 u2 index = bcs->get_index_u2();
2134 verify_cp_type(bcs->bci(), index, cp,
2135 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2136
2137 // Get field name and signature
2138 Symbol* field_name = cp->name_ref_at(index);
2139 Symbol* field_sig = cp->signature_ref_at(index);
2140
2141 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2142 class_format_error(
2143 "Invalid signature for field in class %s referenced "
2144 "from constant pool index %d", _klass->external_name(), index);
2145 return;
2146 }
2147
2148 // Get referenced class type
2149 VerificationType ref_class_type = cp_ref_index_to_type(
2150 index, cp, CHECK_VERIFY(this));
2151 if (!ref_class_type.is_object() &&
2152 (!allow_arrays || !ref_class_type.is_array())) {
2153 verify_error(ErrorContext::bad_type(bcs->bci(),
2154 TypeOrigin::cp(index, ref_class_type)),
2155 "Expecting reference to class in class %s at constant pool index %d",
2156 _klass->external_name(), index);
2157 return;
2158 }
2159 VerificationType target_class_type = ref_class_type;
2160
2161 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2162 "buffer type must match VerificationType size");
2163 uintptr_t field_type_buffer[2];
2164 VerificationType* field_type = (VerificationType*)field_type_buffer;
2165 // If we make a VerificationType[2] array directly, the compiler calls
2166 // to the c-runtime library to do the allocation instead of just
2167 // stack allocating it. Plus it would run constructors. This shows up
2168 // in performance profiles.
2169
2170 SignatureStream sig_stream(field_sig, false);
2171 VerificationType stack_object_type;
2172 int n = change_sig_to_verificationType(
2173 &sig_stream, field_type, CHECK_VERIFY(this));
2174 u2 bci = bcs->bci();
2175 bool is_assignable;
2176 switch (bcs->raw_code()) {
2177 case Bytecodes::_getstatic: {
2178 for (int i = 0; i < n; i++) {
2179 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2180 }
2181 break;
2182 }
2183 case Bytecodes::_putstatic: {
2184 for (int i = n - 1; i >= 0; i--) {
2185 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2186 }
2187 break;
2188 }
2189 case Bytecodes::_getfield: {
2190 stack_object_type = current_frame->pop_stack(
2191 target_class_type, CHECK_VERIFY(this));
2192 for (int i = 0; i < n; i++) {
2193 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2194 }
2195 goto check_protected;
2196 }
2197 case Bytecodes::_putfield: {
2198 for (int i = n - 1; i >= 0; i--) {
2199 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2200 }
2201 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2202
2203 // The JVMS 2nd edition allows field initialization before the superclass
2204 // initializer, if the field is defined within the current class.
2205 fieldDescriptor fd;
2206 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2207 target_class_type.equals(current_type()) &&
2208 _klass->find_local_field(field_name, field_sig, &fd)) {
2209 stack_object_type = current_type();
2210 }
2211 is_assignable = target_class_type.is_assignable_from(
2212 stack_object_type, this, false, CHECK_VERIFY(this));
2213 if (!is_assignable) {
2214 verify_error(ErrorContext::bad_type(bci,
2215 current_frame->stack_top_ctx(),
2216 TypeOrigin::cp(index, target_class_type)),
2217 "Bad type on operand stack in putfield");
2218 return;
2219 }
2220 }
2221 check_protected: {
2222 if (_this_type == stack_object_type)
2223 break; // stack_object_type must be assignable to _current_class_type
2224 Symbol* ref_class_name =
2225 cp->klass_name_at(cp->klass_ref_index_at(index));
2226 if (!name_in_supers(ref_class_name, current_class()))
2227 // stack_object_type must be assignable to _current_class_type since:
2228 // 1. stack_object_type must be assignable to ref_class.
2229 // 2. ref_class must be _current_class or a subclass of it. It can't
2230 // be a superclass of it. See revised JVMS 5.4.4.
2231 break;
2232
2233 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2234 if (is_protected_access(current_class(), ref_class_oop, field_name,
2235 field_sig, false)) {
2236 // It's protected access, check if stack object is assignable to
2237 // current class.
2238 is_assignable = current_type().is_assignable_from(
2239 stack_object_type, this, true, CHECK_VERIFY(this));
2240 if (!is_assignable) {
2241 verify_error(ErrorContext::bad_type(bci,
2242 current_frame->stack_top_ctx(),
2243 TypeOrigin::implicit(current_type())),
2244 "Bad access to protected data in getfield");
2245 return;
2246 }
2247 }
2248 break;
2249 }
2250 default: ShouldNotReachHere();
2251 }
2252 }
2253
2254 // Look at the method's handlers. If the bci is in the handler's try block
2255 // then check if the handler_pc is already on the stack. If not, push it.
2256 void ClassVerifier::push_handlers(ExceptionTable* exhandlers,
2257 GrowableArray<u4>* handler_stack,
2258 u4 bci) {
2259 int exlength = exhandlers->length();
2260 for(int x = 0; x < exlength; x++) {
2261 if (bci >= exhandlers->start_pc(x) && bci < exhandlers->end_pc(x)) {
2262 handler_stack->append_if_missing(exhandlers->handler_pc(x));
2263 }
2264 }
2265 }
2266
2267 // Return TRUE if all code paths starting with start_bc_offset end in
2268 // bytecode athrow or loop.
2269 bool ClassVerifier::ends_in_athrow(u4 start_bc_offset) {
2270 ResourceMark rm;
2271 // Create bytecode stream.
2272 RawBytecodeStream bcs(method());
2273 u4 code_length = method()->code_size();
2274 bcs.set_start(start_bc_offset);
2275 u4 target;
2276 // Create stack for storing bytecode start offsets for if* and *switch.
2277 GrowableArray<u4>* bci_stack = new GrowableArray<u4>(30);
2278 // Create stack for handlers for try blocks containing this handler.
2279 GrowableArray<u4>* handler_stack = new GrowableArray<u4>(30);
2280 // Create list of visited branch opcodes (goto* and if*).
2281 GrowableArray<u4>* visited_branches = new GrowableArray<u4>(30);
2282 ExceptionTable exhandlers(_method());
2283
2284 while (true) {
2285 if (bcs.is_last_bytecode()) {
2286 // if no more starting offsets to parse or if at the end of the
2287 // method then return false.
2288 if ((bci_stack->is_empty()) || ((u4)bcs.end_bci() == code_length))
2289 return false;
2290 // Pop a bytecode starting offset and scan from there.
2291 bcs.set_start(bci_stack->pop());
2292 }
2293 Bytecodes::Code opcode = bcs.raw_next();
2294 u4 bci = bcs.bci();
2295
2296 // If the bytecode is in a TRY block, push its handlers so they
2297 // will get parsed.
2298 push_handlers(&exhandlers, handler_stack, bci);
2299
2300 switch (opcode) {
2301 case Bytecodes::_if_icmpeq:
2302 case Bytecodes::_if_icmpne:
2303 case Bytecodes::_if_icmplt:
2304 case Bytecodes::_if_icmpge:
2305 case Bytecodes::_if_icmpgt:
2306 case Bytecodes::_if_icmple:
2307 case Bytecodes::_ifeq:
2308 case Bytecodes::_ifne:
2309 case Bytecodes::_iflt:
2310 case Bytecodes::_ifge:
2311 case Bytecodes::_ifgt:
2312 case Bytecodes::_ifle:
2313 case Bytecodes::_if_acmpeq:
2314 case Bytecodes::_if_acmpne:
2315 case Bytecodes::_ifnull:
2316 case Bytecodes::_ifnonnull:
2317 target = bcs.dest();
2318 if (visited_branches->contains(bci)) {
2319 if (bci_stack->is_empty()) return true;
2320 // Pop a bytecode starting offset and scan from there.
2321 bcs.set_start(bci_stack->pop());
2322 } else {
2323 if (target > bci) { // forward branch
2324 if (target >= code_length) return false;
2325 // Push the branch target onto the stack.
2326 bci_stack->push(target);
2327 // then, scan bytecodes starting with next.
2328 bcs.set_start(bcs.next_bci());
2329 } else { // backward branch
2330 // Push bytecode offset following backward branch onto the stack.
2331 bci_stack->push(bcs.next_bci());
2332 // Check bytecodes starting with branch target.
2333 bcs.set_start(target);
2334 }
2335 // Record target so we don't branch here again.
2336 visited_branches->append(bci);
2337 }
2338 break;
2339
2340 case Bytecodes::_goto:
2341 case Bytecodes::_goto_w:
2342 target = (opcode == Bytecodes::_goto ? bcs.dest() : bcs.dest_w());
2343 if (visited_branches->contains(bci)) {
2344 if (bci_stack->is_empty()) return true;
2345 // Been here before, pop new starting offset from stack.
2346 bcs.set_start(bci_stack->pop());
2347 } else {
2348 if (target >= code_length) return false;
2349 // Continue scanning from the target onward.
2350 bcs.set_start(target);
2351 // Record target so we don't branch here again.
2352 visited_branches->append(bci);
2353 }
2354 break;
2355
2356 // Check that all switch alternatives end in 'athrow' bytecodes. Since it
2357 // is difficult to determine where each switch alternative ends, parse
2358 // each switch alternative until either hit a 'return', 'athrow', or reach
2359 // the end of the method's bytecodes. This is gross but should be okay
2360 // because:
2361 // 1. tableswitch and lookupswitch byte codes in handlers for ctor explicit
2362 // constructor invocations should be rare.
2363 // 2. if each switch alternative ends in an athrow then the parsing should be
2364 // short. If there is no athrow then it is bogus code, anyway.
2365 case Bytecodes::_lookupswitch:
2366 case Bytecodes::_tableswitch:
2367 {
2368 address aligned_bcp = (address) round_to((intptr_t)(bcs.bcp() + 1), jintSize);
2369 u4 default_offset = Bytes::get_Java_u4(aligned_bcp) + bci;
2370 int keys, delta;
2371 if (opcode == Bytecodes::_tableswitch) {
2372 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2373 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2374 // This is invalid, but let the regular bytecode verifier
2375 // report this because the user will get a better error message.
2376 if (low > high) return true;
2377 keys = high - low + 1;
2378 delta = 1;
2379 } else {
2380 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2381 delta = 2;
2382 }
2383 // Invalid, let the regular bytecode verifier deal with it.
2384 if (keys < 0) return true;
2385
2386 // Push the offset of the next bytecode onto the stack.
2387 bci_stack->push(bcs.next_bci());
2388
2389 // Push the switch alternatives onto the stack.
2390 for (int i = 0; i < keys; i++) {
2391 u4 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2392 if (target > code_length) return false;
2393 bci_stack->push(target);
2394 }
2395
2396 // Start bytecode parsing for the switch at the default alternative.
2397 if (default_offset > code_length) return false;
2398 bcs.set_start(default_offset);
2399 break;
2400 }
2401
2402 case Bytecodes::_return:
2403 return false;
2404
2405 case Bytecodes::_athrow:
2406 {
2407 if (bci_stack->is_empty()) {
2408 if (handler_stack->is_empty()) {
2409 return true;
2410 } else {
2411 // Parse the catch handlers for try blocks containing athrow.
2412 bcs.set_start(handler_stack->pop());
2413 }
2414 } else {
2415 // Pop a bytecode offset and starting scanning from there.
2416 bcs.set_start(bci_stack->pop());
2417 }
2418 }
2419 break;
2420
2421 default:
2422 ;
2423 } // end switch
2424 } // end while loop
2425
2426 return false;
2427 }
2428
2429 void ClassVerifier::verify_invoke_init(
2430 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2431 StackMapFrame* current_frame, u4 code_length, bool in_try_block,
2432 bool *this_uninit, constantPoolHandle cp, StackMapTable* stackmap_table,
2433 TRAPS) {
2434 u2 bci = bcs->bci();
2435 VerificationType type = current_frame->pop_stack(
2436 VerificationType::reference_check(), CHECK_VERIFY(this));
2437 if (type == VerificationType::uninitialized_this_type()) {
2438 // The method must be an <init> method of this class or its superclass
2439 Klass* superk = current_class()->super();
2440 if (ref_class_type.name() != current_class()->name() &&
2441 ref_class_type.name() != superk->name()) {
2442 verify_error(ErrorContext::bad_type(bci,
2443 TypeOrigin::implicit(ref_class_type),
2444 TypeOrigin::implicit(current_type())),
2445 "Bad <init> method call");
2446 return;
2447 }
2448
2449 // If this invokespecial call is done from inside of a TRY block then make
2450 // sure that all catch clause paths end in a throw. Otherwise, this can
2451 // result in returning an incomplete object.
2452 if (in_try_block) {
2453 ExceptionTable exhandlers(_method());
2454 int exlength = exhandlers.length();
2455 for(int i = 0; i < exlength; i++) {
2456 u2 start_pc = exhandlers.start_pc(i);
2457 u2 end_pc = exhandlers.end_pc(i);
2458
2459 if (bci >= start_pc && bci < end_pc) {
2460 if (!ends_in_athrow(exhandlers.handler_pc(i))) {
2461 verify_error(ErrorContext::bad_code(bci),
2462 "Bad <init> method call from after the start of a try block");
2463 return;
2464 } else if (VerboseVerification) {
2465 ResourceMark rm;
2466 tty->print_cr(
2467 "Survived call to ends_in_athrow(): %s",
2468 current_class()->name()->as_C_string());
2469 }
2470 }
2471 }
2472
2473 // Check the exception handler target stackmaps with the locals from the
2474 // incoming stackmap (before initialize_object() changes them to outgoing
2475 // state).
2476 verify_exception_handler_targets(bci, true, current_frame,
2477 stackmap_table, CHECK_VERIFY(this));
2478 } // in_try_block
2479
2480 current_frame->initialize_object(type, current_type());
2481 *this_uninit = true;
2482 } else if (type.is_uninitialized()) {
2483 u2 new_offset = type.bci();
2484 address new_bcp = bcs->bcp() - bci + new_offset;
2485 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2486 /* Unreachable? Stack map parsing ensures valid type and new
2487 * instructions have a valid BCI. */
2488 verify_error(ErrorContext::bad_code(new_offset),
2489 "Expecting new instruction");
2490 return;
2491 }
2492 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2493 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2494
2495 // The method must be an <init> method of the indicated class
2496 VerificationType new_class_type = cp_index_to_type(
2497 new_class_index, cp, CHECK_VERIFY(this));
2498 if (!new_class_type.equals(ref_class_type)) {
2499 verify_error(ErrorContext::bad_type(bci,
2500 TypeOrigin::cp(new_class_index, new_class_type),
2501 TypeOrigin::cp(ref_class_index, ref_class_type)),
2502 "Call to wrong <init> method");
2503 return;
2504 }
2505 // According to the VM spec, if the referent class is a superclass of the
2506 // current class, and is in a different runtime package, and the method is
2507 // protected, then the objectref must be the current class or a subclass
2508 // of the current class.
2509 VerificationType objectref_type = new_class_type;
2510 if (name_in_supers(ref_class_type.name(), current_class())) {
2511 Klass* ref_klass = load_class(ref_class_type.name(), CHECK);
2512 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2513 vmSymbols::object_initializer_name(),
2514 cp->signature_ref_at(bcs->get_index_u2()),
2515 Klass::find_overpass);
2516 // Do nothing if method is not found. Let resolution detect the error.
2517 if (m != NULL) {
2518 instanceKlassHandle mh(THREAD, m->method_holder());
2519 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2520 bool assignable = current_type().is_assignable_from(
2521 objectref_type, this, true, CHECK_VERIFY(this));
2522 if (!assignable) {
2523 verify_error(ErrorContext::bad_type(bci,
2524 TypeOrigin::cp(new_class_index, objectref_type),
2525 TypeOrigin::implicit(current_type())),
2526 "Bad access to protected <init> method");
2527 return;
2528 }
2529 }
2530 }
2531 }
2532 // Check the exception handler target stackmaps with the locals from the
2533 // incoming stackmap (before initialize_object() changes them to outgoing
2534 // state).
2535 if (in_try_block) {
2536 verify_exception_handler_targets(bci, *this_uninit, current_frame,
2537 stackmap_table, CHECK_VERIFY(this));
2538 }
2539 current_frame->initialize_object(type, new_class_type);
2540 } else {
2541 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2542 "Bad operand type when invoking <init>");
2543 return;
2544 }
2545 }
2546
2547 bool ClassVerifier::is_same_or_direct_interface(
2548 instanceKlassHandle klass,
2549 VerificationType klass_type,
2550 VerificationType ref_class_type) {
2551 if (ref_class_type.equals(klass_type)) return true;
2552 Array<Klass*>* local_interfaces = klass->local_interfaces();
2553 if (local_interfaces != NULL) {
2554 for (int x = 0; x < local_interfaces->length(); x++) {
2555 Klass* k = local_interfaces->at(x);
2556 assert (k != NULL && k->is_interface(), "invalid interface");
2557 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2558 return true;
2559 }
2560 }
2561 }
2562 return false;
2563 }
2564
2565 void ClassVerifier::verify_invoke_instructions(
2566 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2567 bool in_try_block, bool *this_uninit, VerificationType return_type,
2568 constantPoolHandle cp, StackMapTable* stackmap_table, TRAPS) {
2569 // Make sure the constant pool item is the right type
2570 u2 index = bcs->get_index_u2();
2571 Bytecodes::Code opcode = bcs->raw_code();
2572 unsigned int types;
2573 switch (opcode) {
2574 case Bytecodes::_invokeinterface:
2575 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2576 break;
2577 case Bytecodes::_invokedynamic:
2578 types = 1 << JVM_CONSTANT_InvokeDynamic;
2579 break;
2580 case Bytecodes::_invokespecial:
2581 case Bytecodes::_invokestatic:
2582 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2583 (1 << JVM_CONSTANT_Methodref) :
2584 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2585 break;
2586 default:
2587 types = 1 << JVM_CONSTANT_Methodref;
2588 }
2589 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2590
2591 // Get method name and signature
2592 Symbol* method_name = cp->name_ref_at(index);
2593 Symbol* method_sig = cp->signature_ref_at(index);
2594
2595 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2596 class_format_error(
2597 "Invalid method signature in class %s referenced "
2598 "from constant pool index %d", _klass->external_name(), index);
2599 return;
2600 }
2601
2602 // Get referenced class type
2603 VerificationType ref_class_type;
2604 if (opcode == Bytecodes::_invokedynamic) {
2605 if (_klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2606 class_format_error(
2607 "invokedynamic instructions not supported by this class file version (%d), class %s",
2608 _klass->major_version(), _klass->external_name());
2609 return;
2610 }
2611 } else {
2612 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2613 }
2614
2615 // For a small signature length, we just allocate 128 bytes instead
2616 // of parsing the signature once to find its size.
2617 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2618 // longs/doubles to be consertive.
2619 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2620 "buffer type must match VerificationType size");
2621 uintptr_t on_stack_sig_types_buffer[128];
2622 // If we make a VerificationType[128] array directly, the compiler calls
2623 // to the c-runtime library to do the allocation instead of just
2624 // stack allocating it. Plus it would run constructors. This shows up
2625 // in performance profiles.
2626
2627 VerificationType* sig_types;
2628 int size = (method_sig->utf8_length() - 3) * 2;
2629 if (size > 128) {
2630 // Long and double occupies two slots here.
2631 ArgumentSizeComputer size_it(method_sig);
2632 size = size_it.size();
2633 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2634 } else{
2635 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2636 }
2637 SignatureStream sig_stream(method_sig);
2638 int sig_i = 0;
2639 while (!sig_stream.at_return_type()) {
2640 sig_i += change_sig_to_verificationType(
2641 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2642 sig_stream.next();
2643 }
2644 int nargs = sig_i;
2645
2646 #ifdef ASSERT
2647 {
2648 ArgumentSizeComputer size_it(method_sig);
2649 assert(nargs == size_it.size(), "Argument sizes do not match");
2650 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2651 }
2652 #endif
2653
2654 // Check instruction operands
2655 u2 bci = bcs->bci();
2656 if (opcode == Bytecodes::_invokeinterface) {
2657 address bcp = bcs->bcp();
2658 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2659 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2660 // the difference between the size of the operand stack before and after the instruction
2661 // executes.
2662 if (*(bcp+3) != (nargs+1)) {
2663 verify_error(ErrorContext::bad_code(bci),
2664 "Inconsistent args count operand in invokeinterface");
2665 return;
2666 }
2667 if (*(bcp+4) != 0) {
2668 verify_error(ErrorContext::bad_code(bci),
2669 "Fourth operand byte of invokeinterface must be zero");
2670 return;
2671 }
2672 }
2673
2674 if (opcode == Bytecodes::_invokedynamic) {
2675 address bcp = bcs->bcp();
2676 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2677 verify_error(ErrorContext::bad_code(bci),
2678 "Third and fourth operand bytes of invokedynamic must be zero");
2679 return;
2680 }
2681 }
2682
2683 if (method_name->byte_at(0) == '<') {
2684 // Make sure <init> can only be invoked by invokespecial
2685 if (opcode != Bytecodes::_invokespecial ||
2686 method_name != vmSymbols::object_initializer_name()) {
2687 verify_error(ErrorContext::bad_code(bci),
2688 "Illegal call to internal method");
2689 return;
2690 }
2691 } else if (opcode == Bytecodes::_invokespecial
2692 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2693 && !ref_class_type.equals(VerificationType::reference_type(
2694 current_class()->super()->name()))) {
2695 bool subtype = false;
2696 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2697 if (!current_class()->is_anonymous()) {
2698 subtype = ref_class_type.is_assignable_from(
2699 current_type(), this, false, CHECK_VERIFY(this));
2700 } else {
2701 VerificationType host_klass_type =
2702 VerificationType::reference_type(current_class()->host_klass()->name());
2703 subtype = ref_class_type.is_assignable_from(host_klass_type, this, false, CHECK_VERIFY(this));
2704
2705 // If invokespecial of IMR, need to recheck for same or
2706 // direct interface relative to the host class
2707 have_imr_indirect = (have_imr_indirect &&
2708 !is_same_or_direct_interface(
2709 InstanceKlass::cast(current_class()->host_klass()),
2710 host_klass_type, ref_class_type));
2711 }
2712 if (!subtype) {
2713 verify_error(ErrorContext::bad_code(bci),
2714 "Bad invokespecial instruction: "
2715 "current class isn't assignable to reference class.");
2716 return;
2717 } else if (have_imr_indirect) {
2718 verify_error(ErrorContext::bad_code(bci),
2719 "Bad invokespecial instruction: "
2720 "interface method reference is in an indirect superinterface.");
2721 return;
2722 }
2723
2724 }
2725 // Match method descriptor with operand stack
2726 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2727 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2728 }
2729 // Check objectref on operand stack
2730 if (opcode != Bytecodes::_invokestatic &&
2731 opcode != Bytecodes::_invokedynamic) {
2732 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2733 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2734 code_length, in_try_block, this_uninit, cp, stackmap_table,
2735 CHECK_VERIFY(this));
2736 } else { // other methods
2737 // Ensures that target class is assignable to method class.
2738 if (opcode == Bytecodes::_invokespecial) {
2739 if (!current_class()->is_anonymous()) {
2740 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2741 } else {
2742 // anonymous class invokespecial calls: check if the
2743 // objectref is a subtype of the host_klass of the current class
2744 // to allow an anonymous class to reference methods in the host_klass
2745 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2746 VerificationType hosttype =
2747 VerificationType::reference_type(current_class()->host_klass()->name());
2748 bool subtype = hosttype.is_assignable_from(top, this, false, CHECK_VERIFY(this));
2749 if (!subtype) {
2750 verify_error( ErrorContext::bad_type(current_frame->offset(),
2751 current_frame->stack_top_ctx(),
2752 TypeOrigin::implicit(top)),
2753 "Bad type on operand stack");
2754 return;
2755 }
2756 }
2757 } else if (opcode == Bytecodes::_invokevirtual) {
2758 VerificationType stack_object_type =
2759 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2760 if (current_type() != stack_object_type) {
2761 assert(cp->cache() == NULL, "not rewritten yet");
2762 Symbol* ref_class_name =
2763 cp->klass_name_at(cp->klass_ref_index_at(index));
2764 // See the comments in verify_field_instructions() for
2765 // the rationale behind this.
2766 if (name_in_supers(ref_class_name, current_class())) {
2767 Klass* ref_class = load_class(ref_class_name, CHECK);
2768 if (is_protected_access(
2769 _klass, ref_class, method_name, method_sig, true)) {
2770 // It's protected access, check if stack object is
2771 // assignable to current class.
2772 bool is_assignable = current_type().is_assignable_from(
2773 stack_object_type, this, true, CHECK_VERIFY(this));
2774 if (!is_assignable) {
2775 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2776 && stack_object_type.is_array()
2777 && method_name == vmSymbols::clone_name()) {
2778 // Special case: arrays pretend to implement public Object
2779 // clone().
2780 } else {
2781 verify_error(ErrorContext::bad_type(bci,
2782 current_frame->stack_top_ctx(),
2783 TypeOrigin::implicit(current_type())),
2784 "Bad access to protected data in invokevirtual");
2785 return;
2786 }
2787 }
2788 }
2789 }
2790 }
2791 } else {
2792 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2793 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2794 }
2795 }
2796 }
2797 // Push the result type.
2798 if (sig_stream.type() != T_VOID) {
2799 if (method_name == vmSymbols::object_initializer_name()) {
2800 // <init> method must have a void return type
2801 /* Unreachable? Class file parser verifies that methods with '<' have
2802 * void return */
2803 verify_error(ErrorContext::bad_code(bci),
2804 "Return type must be void in <init> method");
2805 return;
2806 }
2807 VerificationType return_type[2];
2808 int n = change_sig_to_verificationType(
2809 &sig_stream, return_type, CHECK_VERIFY(this));
2810 for (int i = 0; i < n; i++) {
2811 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2812 }
2813 }
2814 }
2815
2816 VerificationType ClassVerifier::get_newarray_type(
2817 u2 index, u2 bci, TRAPS) {
2818 const char* from_bt[] = {
2819 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2820 };
2821 if (index < T_BOOLEAN || index > T_LONG) {
2822 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2823 return VerificationType::bogus_type();
2824 }
2825
2826 // from_bt[index] contains the array signature which has a length of 2
2827 Symbol* sig = create_temporary_symbol(
2828 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2829 return VerificationType::reference_type(sig);
2830 }
2831
2832 void ClassVerifier::verify_anewarray(
2833 u2 bci, u2 index, constantPoolHandle cp,
2834 StackMapFrame* current_frame, TRAPS) {
2835 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2836 current_frame->pop_stack(
2837 VerificationType::integer_type(), CHECK_VERIFY(this));
2838
2839 VerificationType component_type =
2840 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2841 int length;
2842 char* arr_sig_str;
2843 if (component_type.is_array()) { // it's an array
2844 const char* component_name = component_type.name()->as_utf8();
2845 // add one dimension to component
2846 length = (int)strlen(component_name) + 1;
2847 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2848 arr_sig_str[0] = '[';
2849 strncpy(&arr_sig_str[1], component_name, length - 1);
2850 } else { // it's an object or interface
2851 const char* component_name = component_type.name()->as_utf8();
2852 // add one dimension to component with 'L' prepended and ';' postpended.
2853 length = (int)strlen(component_name) + 3;
2854 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2855 arr_sig_str[0] = '[';
2856 arr_sig_str[1] = 'L';
2857 strncpy(&arr_sig_str[2], component_name, length - 2);
2858 arr_sig_str[length - 1] = ';';
2859 }
2860 Symbol* arr_sig = create_temporary_symbol(
2861 arr_sig_str, length, CHECK_VERIFY(this));
2862 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2863 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2864 }
2865
2866 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2867 current_frame->get_local(
2868 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2869 current_frame->push_stack(
2870 VerificationType::integer_type(), CHECK_VERIFY(this));
2871 }
2872
2873 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2874 current_frame->get_local_2(
2875 index, VerificationType::long_type(),
2876 VerificationType::long2_type(), CHECK_VERIFY(this));
2877 current_frame->push_stack_2(
2878 VerificationType::long_type(),
2879 VerificationType::long2_type(), CHECK_VERIFY(this));
2880 }
2881
2882 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2883 current_frame->get_local(
2884 index, VerificationType::float_type(), CHECK_VERIFY(this));
2885 current_frame->push_stack(
2886 VerificationType::float_type(), CHECK_VERIFY(this));
2887 }
2888
2889 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2890 current_frame->get_local_2(
2891 index, VerificationType::double_type(),
2892 VerificationType::double2_type(), CHECK_VERIFY(this));
2893 current_frame->push_stack_2(
2894 VerificationType::double_type(),
2895 VerificationType::double2_type(), CHECK_VERIFY(this));
2896 }
2897
2898 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2899 VerificationType type = current_frame->get_local(
2900 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2901 current_frame->push_stack(type, CHECK_VERIFY(this));
2902 }
2903
2904 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2905 current_frame->pop_stack(
2906 VerificationType::integer_type(), CHECK_VERIFY(this));
2907 current_frame->set_local(
2908 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2909 }
2910
2911 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2912 current_frame->pop_stack_2(
2913 VerificationType::long2_type(),
2914 VerificationType::long_type(), CHECK_VERIFY(this));
2915 current_frame->set_local_2(
2916 index, VerificationType::long_type(),
2917 VerificationType::long2_type(), CHECK_VERIFY(this));
2918 }
2919
2920 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2921 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2922 current_frame->set_local(
2923 index, VerificationType::float_type(), CHECK_VERIFY(this));
2924 }
2925
2926 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2927 current_frame->pop_stack_2(
2928 VerificationType::double2_type(),
2929 VerificationType::double_type(), CHECK_VERIFY(this));
2930 current_frame->set_local_2(
2931 index, VerificationType::double_type(),
2932 VerificationType::double2_type(), CHECK_VERIFY(this));
2933 }
2934
2935 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2936 VerificationType type = current_frame->pop_stack(
2937 VerificationType::reference_check(), CHECK_VERIFY(this));
2938 current_frame->set_local(index, type, CHECK_VERIFY(this));
2939 }
2940
2941 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2942 VerificationType type = current_frame->get_local(
2943 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2944 current_frame->set_local(index, type, CHECK_VERIFY(this));
2945 }
2946
2947 void ClassVerifier::verify_return_value(
2948 VerificationType return_type, VerificationType type, u2 bci,
2949 StackMapFrame* current_frame, TRAPS) {
2950 if (return_type == VerificationType::bogus_type()) {
2951 verify_error(ErrorContext::bad_type(bci,
2952 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2953 "Method expects a return value");
2954 return;
2955 }
2956 bool match = return_type.is_assignable_from(type, this, false, CHECK_VERIFY(this));
2957 if (!match) {
2958 verify_error(ErrorContext::bad_type(bci,
2959 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2960 "Bad return type");
2961 return;
2962 }
2963 }
2964
2965 // The verifier creates symbols which are substrings of Symbols.
2966 // These are stored in the verifier until the end of verification so that
2967 // they can be reference counted.
2968 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2969 int end, TRAPS) {
2970 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2971 _symbols->push(sym);
2972 return sym;
2973 }
2974
2975 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2976 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2977 _symbols->push(sym);
2978 return sym;
2979 }