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
661 // Merge with the next instruction
662 {
663 u2 index;
664 int target;
665 VerificationType type, type2;
666 VerificationType atype;
667
668 #ifndef PRODUCT
669 if (VerboseVerification) {
670 current_frame.print_on(tty);
671 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
672 }
673 #endif
674
675 // Make sure wide instruction is in correct format
676 if (bcs.is_wide()) {
677 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
678 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
679 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
680 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
681 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
682 opcode != Bytecodes::_dstore) {
683 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
684 * if we encounter a wide instruction that modifies an invalid
685 * opcode (not one of the ones listed above) */
686 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
687 return;
688 }
689 }
690
691 switch (opcode) {
692 case Bytecodes::_nop :
693 no_control_flow = false; break;
694 case Bytecodes::_aconst_null :
695 current_frame.push_stack(
696 VerificationType::null_type(), CHECK_VERIFY(this));
697 no_control_flow = false; break;
698 case Bytecodes::_iconst_m1 :
699 case Bytecodes::_iconst_0 :
700 case Bytecodes::_iconst_1 :
701 case Bytecodes::_iconst_2 :
702 case Bytecodes::_iconst_3 :
703 case Bytecodes::_iconst_4 :
704 case Bytecodes::_iconst_5 :
705 current_frame.push_stack(
706 VerificationType::integer_type(), CHECK_VERIFY(this));
707 no_control_flow = false; break;
708 case Bytecodes::_lconst_0 :
709 case Bytecodes::_lconst_1 :
710 current_frame.push_stack_2(
711 VerificationType::long_type(),
712 VerificationType::long2_type(), CHECK_VERIFY(this));
713 no_control_flow = false; break;
714 case Bytecodes::_fconst_0 :
715 case Bytecodes::_fconst_1 :
716 case Bytecodes::_fconst_2 :
717 current_frame.push_stack(
718 VerificationType::float_type(), CHECK_VERIFY(this));
719 no_control_flow = false; break;
720 case Bytecodes::_dconst_0 :
721 case Bytecodes::_dconst_1 :
722 current_frame.push_stack_2(
723 VerificationType::double_type(),
724 VerificationType::double2_type(), CHECK_VERIFY(this));
725 no_control_flow = false; break;
726 case Bytecodes::_sipush :
727 case Bytecodes::_bipush :
728 current_frame.push_stack(
729 VerificationType::integer_type(), CHECK_VERIFY(this));
730 no_control_flow = false; break;
731 case Bytecodes::_ldc :
732 verify_ldc(
733 opcode, bcs.get_index_u1(), ¤t_frame,
734 cp, bci, CHECK_VERIFY(this));
735 no_control_flow = false; break;
736 case Bytecodes::_ldc_w :
737 case Bytecodes::_ldc2_w :
738 verify_ldc(
739 opcode, bcs.get_index_u2(), ¤t_frame,
740 cp, bci, CHECK_VERIFY(this));
741 no_control_flow = false; break;
742 case Bytecodes::_iload :
743 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
744 no_control_flow = false; break;
745 case Bytecodes::_iload_0 :
746 case Bytecodes::_iload_1 :
747 case Bytecodes::_iload_2 :
748 case Bytecodes::_iload_3 :
749 index = opcode - Bytecodes::_iload_0;
750 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
751 no_control_flow = false; break;
752 case Bytecodes::_lload :
753 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
754 no_control_flow = false; break;
755 case Bytecodes::_lload_0 :
756 case Bytecodes::_lload_1 :
757 case Bytecodes::_lload_2 :
758 case Bytecodes::_lload_3 :
759 index = opcode - Bytecodes::_lload_0;
760 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
761 no_control_flow = false; break;
762 case Bytecodes::_fload :
763 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
764 no_control_flow = false; break;
765 case Bytecodes::_fload_0 :
766 case Bytecodes::_fload_1 :
767 case Bytecodes::_fload_2 :
768 case Bytecodes::_fload_3 :
769 index = opcode - Bytecodes::_fload_0;
770 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
771 no_control_flow = false; break;
772 case Bytecodes::_dload :
773 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
774 no_control_flow = false; break;
775 case Bytecodes::_dload_0 :
776 case Bytecodes::_dload_1 :
777 case Bytecodes::_dload_2 :
778 case Bytecodes::_dload_3 :
779 index = opcode - Bytecodes::_dload_0;
780 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
781 no_control_flow = false; break;
782 case Bytecodes::_aload :
783 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
784 no_control_flow = false; break;
785 case Bytecodes::_aload_0 :
786 case Bytecodes::_aload_1 :
787 case Bytecodes::_aload_2 :
788 case Bytecodes::_aload_3 :
789 index = opcode - Bytecodes::_aload_0;
790 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
791 no_control_flow = false; break;
792 case Bytecodes::_iaload :
793 type = current_frame.pop_stack(
794 VerificationType::integer_type(), CHECK_VERIFY(this));
795 atype = current_frame.pop_stack(
796 VerificationType::reference_check(), CHECK_VERIFY(this));
797 if (!atype.is_int_array()) {
798 verify_error(ErrorContext::bad_type(bci,
799 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
800 bad_type_msg, "iaload");
801 return;
802 }
803 current_frame.push_stack(
804 VerificationType::integer_type(), CHECK_VERIFY(this));
805 no_control_flow = false; break;
806 case Bytecodes::_baload :
807 type = current_frame.pop_stack(
808 VerificationType::integer_type(), CHECK_VERIFY(this));
809 atype = current_frame.pop_stack(
810 VerificationType::reference_check(), CHECK_VERIFY(this));
811 if (!atype.is_bool_array() && !atype.is_byte_array()) {
812 verify_error(
813 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
814 bad_type_msg, "baload");
815 return;
816 }
817 current_frame.push_stack(
818 VerificationType::integer_type(), CHECK_VERIFY(this));
819 no_control_flow = false; break;
820 case Bytecodes::_caload :
821 type = current_frame.pop_stack(
822 VerificationType::integer_type(), CHECK_VERIFY(this));
823 atype = current_frame.pop_stack(
824 VerificationType::reference_check(), CHECK_VERIFY(this));
825 if (!atype.is_char_array()) {
826 verify_error(ErrorContext::bad_type(bci,
827 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
828 bad_type_msg, "caload");
829 return;
830 }
831 current_frame.push_stack(
832 VerificationType::integer_type(), CHECK_VERIFY(this));
833 no_control_flow = false; break;
834 case Bytecodes::_saload :
835 type = current_frame.pop_stack(
836 VerificationType::integer_type(), CHECK_VERIFY(this));
837 atype = current_frame.pop_stack(
838 VerificationType::reference_check(), CHECK_VERIFY(this));
839 if (!atype.is_short_array()) {
840 verify_error(ErrorContext::bad_type(bci,
841 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
842 bad_type_msg, "saload");
843 return;
844 }
845 current_frame.push_stack(
846 VerificationType::integer_type(), CHECK_VERIFY(this));
847 no_control_flow = false; break;
848 case Bytecodes::_laload :
849 type = current_frame.pop_stack(
850 VerificationType::integer_type(), CHECK_VERIFY(this));
851 atype = current_frame.pop_stack(
852 VerificationType::reference_check(), CHECK_VERIFY(this));
853 if (!atype.is_long_array()) {
854 verify_error(ErrorContext::bad_type(bci,
855 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
856 bad_type_msg, "laload");
857 return;
858 }
859 current_frame.push_stack_2(
860 VerificationType::long_type(),
861 VerificationType::long2_type(), CHECK_VERIFY(this));
862 no_control_flow = false; break;
863 case Bytecodes::_faload :
864 type = current_frame.pop_stack(
865 VerificationType::integer_type(), CHECK_VERIFY(this));
866 atype = current_frame.pop_stack(
867 VerificationType::reference_check(), CHECK_VERIFY(this));
868 if (!atype.is_float_array()) {
869 verify_error(ErrorContext::bad_type(bci,
870 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
871 bad_type_msg, "faload");
872 return;
873 }
874 current_frame.push_stack(
875 VerificationType::float_type(), CHECK_VERIFY(this));
876 no_control_flow = false; break;
877 case Bytecodes::_daload :
878 type = current_frame.pop_stack(
879 VerificationType::integer_type(), CHECK_VERIFY(this));
880 atype = current_frame.pop_stack(
881 VerificationType::reference_check(), CHECK_VERIFY(this));
882 if (!atype.is_double_array()) {
883 verify_error(ErrorContext::bad_type(bci,
884 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
885 bad_type_msg, "daload");
886 return;
887 }
888 current_frame.push_stack_2(
889 VerificationType::double_type(),
890 VerificationType::double2_type(), CHECK_VERIFY(this));
891 no_control_flow = false; break;
892 case Bytecodes::_aaload : {
893 type = current_frame.pop_stack(
894 VerificationType::integer_type(), CHECK_VERIFY(this));
895 atype = current_frame.pop_stack(
896 VerificationType::reference_check(), CHECK_VERIFY(this));
897 if (!atype.is_reference_array()) {
898 verify_error(ErrorContext::bad_type(bci,
899 current_frame.stack_top_ctx(),
900 TypeOrigin::implicit(VerificationType::reference_check())),
901 bad_type_msg, "aaload");
902 return;
903 }
904 if (atype.is_null()) {
905 current_frame.push_stack(
906 VerificationType::null_type(), CHECK_VERIFY(this));
907 } else {
908 VerificationType component =
909 atype.get_component(this, CHECK_VERIFY(this));
910 current_frame.push_stack(component, CHECK_VERIFY(this));
911 }
912 no_control_flow = false; break;
913 }
914 case Bytecodes::_istore :
915 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
916 no_control_flow = false; break;
917 case Bytecodes::_istore_0 :
918 case Bytecodes::_istore_1 :
919 case Bytecodes::_istore_2 :
920 case Bytecodes::_istore_3 :
921 index = opcode - Bytecodes::_istore_0;
922 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
923 no_control_flow = false; break;
924 case Bytecodes::_lstore :
925 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
926 no_control_flow = false; break;
927 case Bytecodes::_lstore_0 :
928 case Bytecodes::_lstore_1 :
929 case Bytecodes::_lstore_2 :
930 case Bytecodes::_lstore_3 :
931 index = opcode - Bytecodes::_lstore_0;
932 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
933 no_control_flow = false; break;
934 case Bytecodes::_fstore :
935 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
936 no_control_flow = false; break;
937 case Bytecodes::_fstore_0 :
938 case Bytecodes::_fstore_1 :
939 case Bytecodes::_fstore_2 :
940 case Bytecodes::_fstore_3 :
941 index = opcode - Bytecodes::_fstore_0;
942 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
943 no_control_flow = false; break;
944 case Bytecodes::_dstore :
945 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
946 no_control_flow = false; break;
947 case Bytecodes::_dstore_0 :
948 case Bytecodes::_dstore_1 :
949 case Bytecodes::_dstore_2 :
950 case Bytecodes::_dstore_3 :
951 index = opcode - Bytecodes::_dstore_0;
952 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
953 no_control_flow = false; break;
954 case Bytecodes::_astore :
955 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
956 no_control_flow = false; break;
957 case Bytecodes::_astore_0 :
958 case Bytecodes::_astore_1 :
959 case Bytecodes::_astore_2 :
960 case Bytecodes::_astore_3 :
961 index = opcode - Bytecodes::_astore_0;
962 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
963 no_control_flow = false; break;
964 case Bytecodes::_iastore :
965 type = current_frame.pop_stack(
966 VerificationType::integer_type(), CHECK_VERIFY(this));
967 type2 = current_frame.pop_stack(
968 VerificationType::integer_type(), CHECK_VERIFY(this));
969 atype = current_frame.pop_stack(
970 VerificationType::reference_check(), CHECK_VERIFY(this));
971 if (!atype.is_int_array()) {
972 verify_error(ErrorContext::bad_type(bci,
973 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
974 bad_type_msg, "iastore");
975 return;
976 }
977 no_control_flow = false; break;
978 case Bytecodes::_bastore :
979 type = current_frame.pop_stack(
980 VerificationType::integer_type(), CHECK_VERIFY(this));
981 type2 = current_frame.pop_stack(
982 VerificationType::integer_type(), CHECK_VERIFY(this));
983 atype = current_frame.pop_stack(
984 VerificationType::reference_check(), CHECK_VERIFY(this));
985 if (!atype.is_bool_array() && !atype.is_byte_array()) {
986 verify_error(
987 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
988 bad_type_msg, "bastore");
989 return;
990 }
991 no_control_flow = false; break;
992 case Bytecodes::_castore :
993 current_frame.pop_stack(
994 VerificationType::integer_type(), CHECK_VERIFY(this));
995 current_frame.pop_stack(
996 VerificationType::integer_type(), CHECK_VERIFY(this));
997 atype = current_frame.pop_stack(
998 VerificationType::reference_check(), CHECK_VERIFY(this));
999 if (!atype.is_char_array()) {
1000 verify_error(ErrorContext::bad_type(bci,
1001 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
1002 bad_type_msg, "castore");
1003 return;
1004 }
1005 no_control_flow = false; break;
1006 case Bytecodes::_sastore :
1007 current_frame.pop_stack(
1008 VerificationType::integer_type(), CHECK_VERIFY(this));
1009 current_frame.pop_stack(
1010 VerificationType::integer_type(), CHECK_VERIFY(this));
1011 atype = current_frame.pop_stack(
1012 VerificationType::reference_check(), CHECK_VERIFY(this));
1013 if (!atype.is_short_array()) {
1014 verify_error(ErrorContext::bad_type(bci,
1015 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1016 bad_type_msg, "sastore");
1017 return;
1018 }
1019 no_control_flow = false; break;
1020 case Bytecodes::_lastore :
1021 current_frame.pop_stack_2(
1022 VerificationType::long2_type(),
1023 VerificationType::long_type(), CHECK_VERIFY(this));
1024 current_frame.pop_stack(
1025 VerificationType::integer_type(), CHECK_VERIFY(this));
1026 atype = current_frame.pop_stack(
1027 VerificationType::reference_check(), CHECK_VERIFY(this));
1028 if (!atype.is_long_array()) {
1029 verify_error(ErrorContext::bad_type(bci,
1030 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1031 bad_type_msg, "lastore");
1032 return;
1033 }
1034 no_control_flow = false; break;
1035 case Bytecodes::_fastore :
1036 current_frame.pop_stack(
1037 VerificationType::float_type(), CHECK_VERIFY(this));
1038 current_frame.pop_stack
1039 (VerificationType::integer_type(), CHECK_VERIFY(this));
1040 atype = current_frame.pop_stack(
1041 VerificationType::reference_check(), CHECK_VERIFY(this));
1042 if (!atype.is_float_array()) {
1043 verify_error(ErrorContext::bad_type(bci,
1044 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1045 bad_type_msg, "fastore");
1046 return;
1047 }
1048 no_control_flow = false; break;
1049 case Bytecodes::_dastore :
1050 current_frame.pop_stack_2(
1051 VerificationType::double2_type(),
1052 VerificationType::double_type(), CHECK_VERIFY(this));
1053 current_frame.pop_stack(
1054 VerificationType::integer_type(), CHECK_VERIFY(this));
1055 atype = current_frame.pop_stack(
1056 VerificationType::reference_check(), CHECK_VERIFY(this));
1057 if (!atype.is_double_array()) {
1058 verify_error(ErrorContext::bad_type(bci,
1059 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1060 bad_type_msg, "dastore");
1061 return;
1062 }
1063 no_control_flow = false; break;
1064 case Bytecodes::_aastore :
1065 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1066 type2 = current_frame.pop_stack(
1067 VerificationType::integer_type(), CHECK_VERIFY(this));
1068 atype = current_frame.pop_stack(
1069 VerificationType::reference_check(), CHECK_VERIFY(this));
1070 // more type-checking is done at runtime
1071 if (!atype.is_reference_array()) {
1072 verify_error(ErrorContext::bad_type(bci,
1073 current_frame.stack_top_ctx(),
1074 TypeOrigin::implicit(VerificationType::reference_check())),
1075 bad_type_msg, "aastore");
1076 return;
1077 }
1078 // 4938384: relaxed constraint in JVMS 3nd edition.
1079 no_control_flow = false; break;
1080 case Bytecodes::_pop :
1081 current_frame.pop_stack(
1082 VerificationType::category1_check(), CHECK_VERIFY(this));
1083 no_control_flow = false; break;
1084 case Bytecodes::_pop2 :
1085 type = current_frame.pop_stack(CHECK_VERIFY(this));
1086 if (type.is_category1()) {
1087 current_frame.pop_stack(
1088 VerificationType::category1_check(), CHECK_VERIFY(this));
1089 } else if (type.is_category2_2nd()) {
1090 current_frame.pop_stack(
1091 VerificationType::category2_check(), CHECK_VERIFY(this));
1092 } else {
1093 /* Unreachable? Would need a category2_1st on TOS
1094 * which does not appear possible. */
1095 verify_error(
1096 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1097 bad_type_msg, "pop2");
1098 return;
1099 }
1100 no_control_flow = false; break;
1101 case Bytecodes::_dup :
1102 type = current_frame.pop_stack(
1103 VerificationType::category1_check(), CHECK_VERIFY(this));
1104 current_frame.push_stack(type, CHECK_VERIFY(this));
1105 current_frame.push_stack(type, CHECK_VERIFY(this));
1106 no_control_flow = false; break;
1107 case Bytecodes::_dup_x1 :
1108 type = current_frame.pop_stack(
1109 VerificationType::category1_check(), CHECK_VERIFY(this));
1110 type2 = current_frame.pop_stack(
1111 VerificationType::category1_check(), CHECK_VERIFY(this));
1112 current_frame.push_stack(type, CHECK_VERIFY(this));
1113 current_frame.push_stack(type2, CHECK_VERIFY(this));
1114 current_frame.push_stack(type, CHECK_VERIFY(this));
1115 no_control_flow = false; break;
1116 case Bytecodes::_dup_x2 :
1117 {
1118 VerificationType type3;
1119 type = current_frame.pop_stack(
1120 VerificationType::category1_check(), CHECK_VERIFY(this));
1121 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1122 if (type2.is_category1()) {
1123 type3 = current_frame.pop_stack(
1124 VerificationType::category1_check(), CHECK_VERIFY(this));
1125 } else if (type2.is_category2_2nd()) {
1126 type3 = current_frame.pop_stack(
1127 VerificationType::category2_check(), CHECK_VERIFY(this));
1128 } else {
1129 /* Unreachable? Would need a category2_1st at stack depth 2 with
1130 * a category1 on TOS which does not appear possible. */
1131 verify_error(ErrorContext::bad_type(
1132 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1133 return;
1134 }
1135 current_frame.push_stack(type, CHECK_VERIFY(this));
1136 current_frame.push_stack(type3, CHECK_VERIFY(this));
1137 current_frame.push_stack(type2, CHECK_VERIFY(this));
1138 current_frame.push_stack(type, CHECK_VERIFY(this));
1139 no_control_flow = false; break;
1140 }
1141 case Bytecodes::_dup2 :
1142 type = current_frame.pop_stack(CHECK_VERIFY(this));
1143 if (type.is_category1()) {
1144 type2 = current_frame.pop_stack(
1145 VerificationType::category1_check(), CHECK_VERIFY(this));
1146 } else if (type.is_category2_2nd()) {
1147 type2 = current_frame.pop_stack(
1148 VerificationType::category2_check(), CHECK_VERIFY(this));
1149 } else {
1150 /* Unreachable? Would need a category2_1st on TOS which does not
1151 * appear possible. */
1152 verify_error(
1153 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1154 bad_type_msg, "dup2");
1155 return;
1156 }
1157 current_frame.push_stack(type2, CHECK_VERIFY(this));
1158 current_frame.push_stack(type, CHECK_VERIFY(this));
1159 current_frame.push_stack(type2, CHECK_VERIFY(this));
1160 current_frame.push_stack(type, CHECK_VERIFY(this));
1161 no_control_flow = false; break;
1162 case Bytecodes::_dup2_x1 :
1163 {
1164 VerificationType type3;
1165 type = current_frame.pop_stack(CHECK_VERIFY(this));
1166 if (type.is_category1()) {
1167 type2 = current_frame.pop_stack(
1168 VerificationType::category1_check(), CHECK_VERIFY(this));
1169 } else if (type.is_category2_2nd()) {
1170 type2 = current_frame.pop_stack(
1171 VerificationType::category2_check(), CHECK_VERIFY(this));
1172 } else {
1173 /* Unreachable? Would need a category2_1st on TOS which does
1174 * not appear possible. */
1175 verify_error(
1176 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1177 bad_type_msg, "dup2_x1");
1178 return;
1179 }
1180 type3 = current_frame.pop_stack(
1181 VerificationType::category1_check(), CHECK_VERIFY(this));
1182 current_frame.push_stack(type2, CHECK_VERIFY(this));
1183 current_frame.push_stack(type, CHECK_VERIFY(this));
1184 current_frame.push_stack(type3, CHECK_VERIFY(this));
1185 current_frame.push_stack(type2, CHECK_VERIFY(this));
1186 current_frame.push_stack(type, CHECK_VERIFY(this));
1187 no_control_flow = false; break;
1188 }
1189 case Bytecodes::_dup2_x2 :
1190 {
1191 VerificationType type3, type4;
1192 type = current_frame.pop_stack(CHECK_VERIFY(this));
1193 if (type.is_category1()) {
1194 type2 = current_frame.pop_stack(
1195 VerificationType::category1_check(), CHECK_VERIFY(this));
1196 } else if (type.is_category2_2nd()) {
1197 type2 = current_frame.pop_stack(
1198 VerificationType::category2_check(), CHECK_VERIFY(this));
1199 } else {
1200 /* Unreachable? Would need a category2_1st on TOS which does
1201 * not appear possible. */
1202 verify_error(
1203 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1204 bad_type_msg, "dup2_x2");
1205 return;
1206 }
1207 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1208 if (type3.is_category1()) {
1209 type4 = current_frame.pop_stack(
1210 VerificationType::category1_check(), CHECK_VERIFY(this));
1211 } else if (type3.is_category2_2nd()) {
1212 type4 = current_frame.pop_stack(
1213 VerificationType::category2_check(), CHECK_VERIFY(this));
1214 } else {
1215 /* Unreachable? Would need a category2_1st on TOS after popping
1216 * a long/double or two category 1's, which does not
1217 * appear possible. */
1218 verify_error(
1219 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1220 bad_type_msg, "dup2_x2");
1221 return;
1222 }
1223 current_frame.push_stack(type2, CHECK_VERIFY(this));
1224 current_frame.push_stack(type, CHECK_VERIFY(this));
1225 current_frame.push_stack(type4, CHECK_VERIFY(this));
1226 current_frame.push_stack(type3, CHECK_VERIFY(this));
1227 current_frame.push_stack(type2, CHECK_VERIFY(this));
1228 current_frame.push_stack(type, CHECK_VERIFY(this));
1229 no_control_flow = false; break;
1230 }
1231 case Bytecodes::_swap :
1232 type = current_frame.pop_stack(
1233 VerificationType::category1_check(), CHECK_VERIFY(this));
1234 type2 = current_frame.pop_stack(
1235 VerificationType::category1_check(), CHECK_VERIFY(this));
1236 current_frame.push_stack(type, CHECK_VERIFY(this));
1237 current_frame.push_stack(type2, CHECK_VERIFY(this));
1238 no_control_flow = false; break;
1239 case Bytecodes::_iadd :
1240 case Bytecodes::_isub :
1241 case Bytecodes::_imul :
1242 case Bytecodes::_idiv :
1243 case Bytecodes::_irem :
1244 case Bytecodes::_ishl :
1245 case Bytecodes::_ishr :
1246 case Bytecodes::_iushr :
1247 case Bytecodes::_ior :
1248 case Bytecodes::_ixor :
1249 case Bytecodes::_iand :
1250 current_frame.pop_stack(
1251 VerificationType::integer_type(), CHECK_VERIFY(this));
1252 // fall through
1253 case Bytecodes::_ineg :
1254 current_frame.pop_stack(
1255 VerificationType::integer_type(), CHECK_VERIFY(this));
1256 current_frame.push_stack(
1257 VerificationType::integer_type(), CHECK_VERIFY(this));
1258 no_control_flow = false; break;
1259 case Bytecodes::_ladd :
1260 case Bytecodes::_lsub :
1261 case Bytecodes::_lmul :
1262 case Bytecodes::_ldiv :
1263 case Bytecodes::_lrem :
1264 case Bytecodes::_land :
1265 case Bytecodes::_lor :
1266 case Bytecodes::_lxor :
1267 current_frame.pop_stack_2(
1268 VerificationType::long2_type(),
1269 VerificationType::long_type(), CHECK_VERIFY(this));
1270 // fall through
1271 case Bytecodes::_lneg :
1272 current_frame.pop_stack_2(
1273 VerificationType::long2_type(),
1274 VerificationType::long_type(), CHECK_VERIFY(this));
1275 current_frame.push_stack_2(
1276 VerificationType::long_type(),
1277 VerificationType::long2_type(), CHECK_VERIFY(this));
1278 no_control_flow = false; break;
1279 case Bytecodes::_lshl :
1280 case Bytecodes::_lshr :
1281 case Bytecodes::_lushr :
1282 current_frame.pop_stack(
1283 VerificationType::integer_type(), CHECK_VERIFY(this));
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::_fadd :
1292 case Bytecodes::_fsub :
1293 case Bytecodes::_fmul :
1294 case Bytecodes::_fdiv :
1295 case Bytecodes::_frem :
1296 current_frame.pop_stack(
1297 VerificationType::float_type(), CHECK_VERIFY(this));
1298 // fall through
1299 case Bytecodes::_fneg :
1300 current_frame.pop_stack(
1301 VerificationType::float_type(), CHECK_VERIFY(this));
1302 current_frame.push_stack(
1303 VerificationType::float_type(), CHECK_VERIFY(this));
1304 no_control_flow = false; break;
1305 case Bytecodes::_dadd :
1306 case Bytecodes::_dsub :
1307 case Bytecodes::_dmul :
1308 case Bytecodes::_ddiv :
1309 case Bytecodes::_drem :
1310 current_frame.pop_stack_2(
1311 VerificationType::double2_type(),
1312 VerificationType::double_type(), CHECK_VERIFY(this));
1313 // fall through
1314 case Bytecodes::_dneg :
1315 current_frame.pop_stack_2(
1316 VerificationType::double2_type(),
1317 VerificationType::double_type(), CHECK_VERIFY(this));
1318 current_frame.push_stack_2(
1319 VerificationType::double_type(),
1320 VerificationType::double2_type(), CHECK_VERIFY(this));
1321 no_control_flow = false; break;
1322 case Bytecodes::_iinc :
1323 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1324 no_control_flow = false; break;
1325 case Bytecodes::_i2l :
1326 type = current_frame.pop_stack(
1327 VerificationType::integer_type(), CHECK_VERIFY(this));
1328 current_frame.push_stack_2(
1329 VerificationType::long_type(),
1330 VerificationType::long2_type(), CHECK_VERIFY(this));
1331 no_control_flow = false; break;
1332 case Bytecodes::_l2i :
1333 current_frame.pop_stack_2(
1334 VerificationType::long2_type(),
1335 VerificationType::long_type(), CHECK_VERIFY(this));
1336 current_frame.push_stack(
1337 VerificationType::integer_type(), CHECK_VERIFY(this));
1338 no_control_flow = false; break;
1339 case Bytecodes::_i2f :
1340 current_frame.pop_stack(
1341 VerificationType::integer_type(), CHECK_VERIFY(this));
1342 current_frame.push_stack(
1343 VerificationType::float_type(), CHECK_VERIFY(this));
1344 no_control_flow = false; break;
1345 case Bytecodes::_i2d :
1346 current_frame.pop_stack(
1347 VerificationType::integer_type(), CHECK_VERIFY(this));
1348 current_frame.push_stack_2(
1349 VerificationType::double_type(),
1350 VerificationType::double2_type(), CHECK_VERIFY(this));
1351 no_control_flow = false; break;
1352 case Bytecodes::_l2f :
1353 current_frame.pop_stack_2(
1354 VerificationType::long2_type(),
1355 VerificationType::long_type(), CHECK_VERIFY(this));
1356 current_frame.push_stack(
1357 VerificationType::float_type(), CHECK_VERIFY(this));
1358 no_control_flow = false; break;
1359 case Bytecodes::_l2d :
1360 current_frame.pop_stack_2(
1361 VerificationType::long2_type(),
1362 VerificationType::long_type(), CHECK_VERIFY(this));
1363 current_frame.push_stack_2(
1364 VerificationType::double_type(),
1365 VerificationType::double2_type(), CHECK_VERIFY(this));
1366 no_control_flow = false; break;
1367 case Bytecodes::_f2i :
1368 current_frame.pop_stack(
1369 VerificationType::float_type(), CHECK_VERIFY(this));
1370 current_frame.push_stack(
1371 VerificationType::integer_type(), CHECK_VERIFY(this));
1372 no_control_flow = false; break;
1373 case Bytecodes::_f2l :
1374 current_frame.pop_stack(
1375 VerificationType::float_type(), CHECK_VERIFY(this));
1376 current_frame.push_stack_2(
1377 VerificationType::long_type(),
1378 VerificationType::long2_type(), CHECK_VERIFY(this));
1379 no_control_flow = false; break;
1380 case Bytecodes::_f2d :
1381 current_frame.pop_stack(
1382 VerificationType::float_type(), CHECK_VERIFY(this));
1383 current_frame.push_stack_2(
1384 VerificationType::double_type(),
1385 VerificationType::double2_type(), CHECK_VERIFY(this));
1386 no_control_flow = false; break;
1387 case Bytecodes::_d2i :
1388 current_frame.pop_stack_2(
1389 VerificationType::double2_type(),
1390 VerificationType::double_type(), CHECK_VERIFY(this));
1391 current_frame.push_stack(
1392 VerificationType::integer_type(), CHECK_VERIFY(this));
1393 no_control_flow = false; break;
1394 case Bytecodes::_d2l :
1395 current_frame.pop_stack_2(
1396 VerificationType::double2_type(),
1397 VerificationType::double_type(), CHECK_VERIFY(this));
1398 current_frame.push_stack_2(
1399 VerificationType::long_type(),
1400 VerificationType::long2_type(), CHECK_VERIFY(this));
1401 no_control_flow = false; break;
1402 case Bytecodes::_d2f :
1403 current_frame.pop_stack_2(
1404 VerificationType::double2_type(),
1405 VerificationType::double_type(), CHECK_VERIFY(this));
1406 current_frame.push_stack(
1407 VerificationType::float_type(), CHECK_VERIFY(this));
1408 no_control_flow = false; break;
1409 case Bytecodes::_i2b :
1410 case Bytecodes::_i2c :
1411 case Bytecodes::_i2s :
1412 current_frame.pop_stack(
1413 VerificationType::integer_type(), CHECK_VERIFY(this));
1414 current_frame.push_stack(
1415 VerificationType::integer_type(), CHECK_VERIFY(this));
1416 no_control_flow = false; break;
1417 case Bytecodes::_lcmp :
1418 current_frame.pop_stack_2(
1419 VerificationType::long2_type(),
1420 VerificationType::long_type(), CHECK_VERIFY(this));
1421 current_frame.pop_stack_2(
1422 VerificationType::long2_type(),
1423 VerificationType::long_type(), CHECK_VERIFY(this));
1424 current_frame.push_stack(
1425 VerificationType::integer_type(), CHECK_VERIFY(this));
1426 no_control_flow = false; break;
1427 case Bytecodes::_fcmpl :
1428 case Bytecodes::_fcmpg :
1429 current_frame.pop_stack(
1430 VerificationType::float_type(), CHECK_VERIFY(this));
1431 current_frame.pop_stack(
1432 VerificationType::float_type(), CHECK_VERIFY(this));
1433 current_frame.push_stack(
1434 VerificationType::integer_type(), CHECK_VERIFY(this));
1435 no_control_flow = false; break;
1436 case Bytecodes::_dcmpl :
1437 case Bytecodes::_dcmpg :
1438 current_frame.pop_stack_2(
1439 VerificationType::double2_type(),
1440 VerificationType::double_type(), CHECK_VERIFY(this));
1441 current_frame.pop_stack_2(
1442 VerificationType::double2_type(),
1443 VerificationType::double_type(), CHECK_VERIFY(this));
1444 current_frame.push_stack(
1445 VerificationType::integer_type(), CHECK_VERIFY(this));
1446 no_control_flow = false; break;
1447 case Bytecodes::_if_icmpeq:
1448 case Bytecodes::_if_icmpne:
1449 case Bytecodes::_if_icmplt:
1450 case Bytecodes::_if_icmpge:
1451 case Bytecodes::_if_icmpgt:
1452 case Bytecodes::_if_icmple:
1453 current_frame.pop_stack(
1454 VerificationType::integer_type(), CHECK_VERIFY(this));
1455 // fall through
1456 case Bytecodes::_ifeq:
1457 case Bytecodes::_ifne:
1458 case Bytecodes::_iflt:
1459 case Bytecodes::_ifge:
1460 case Bytecodes::_ifgt:
1461 case Bytecodes::_ifle:
1462 current_frame.pop_stack(
1463 VerificationType::integer_type(), CHECK_VERIFY(this));
1464 target = bcs.dest();
1465 stackmap_table.check_jump_target(
1466 ¤t_frame, target, CHECK_VERIFY(this));
1467 no_control_flow = false; break;
1468 case Bytecodes::_if_acmpeq :
1469 case Bytecodes::_if_acmpne :
1470 current_frame.pop_stack(
1471 VerificationType::reference_check(), CHECK_VERIFY(this));
1472 // fall through
1473 case Bytecodes::_ifnull :
1474 case Bytecodes::_ifnonnull :
1475 current_frame.pop_stack(
1476 VerificationType::reference_check(), CHECK_VERIFY(this));
1477 target = bcs.dest();
1478 stackmap_table.check_jump_target
1479 (¤t_frame, target, CHECK_VERIFY(this));
1480 no_control_flow = false; break;
1481 case Bytecodes::_goto :
1482 target = bcs.dest();
1483 stackmap_table.check_jump_target(
1484 ¤t_frame, target, CHECK_VERIFY(this));
1485 no_control_flow = true; break;
1486 case Bytecodes::_goto_w :
1487 target = bcs.dest_w();
1488 stackmap_table.check_jump_target(
1489 ¤t_frame, target, CHECK_VERIFY(this));
1490 no_control_flow = true; break;
1491 case Bytecodes::_tableswitch :
1492 case Bytecodes::_lookupswitch :
1493 verify_switch(
1494 &bcs, code_length, code_data, ¤t_frame,
1495 &stackmap_table, CHECK_VERIFY(this));
1496 no_control_flow = true; break;
1497 case Bytecodes::_ireturn :
1498 type = current_frame.pop_stack(
1499 VerificationType::integer_type(), CHECK_VERIFY(this));
1500 verify_return_value(return_type, type, bci,
1501 ¤t_frame, CHECK_VERIFY(this));
1502 no_control_flow = true; break;
1503 case Bytecodes::_lreturn :
1504 type2 = current_frame.pop_stack(
1505 VerificationType::long2_type(), CHECK_VERIFY(this));
1506 type = current_frame.pop_stack(
1507 VerificationType::long_type(), CHECK_VERIFY(this));
1508 verify_return_value(return_type, type, bci,
1509 ¤t_frame, CHECK_VERIFY(this));
1510 no_control_flow = true; break;
1511 case Bytecodes::_freturn :
1512 type = current_frame.pop_stack(
1513 VerificationType::float_type(), CHECK_VERIFY(this));
1514 verify_return_value(return_type, type, bci,
1515 ¤t_frame, CHECK_VERIFY(this));
1516 no_control_flow = true; break;
1517 case Bytecodes::_dreturn :
1518 type2 = current_frame.pop_stack(
1519 VerificationType::double2_type(), CHECK_VERIFY(this));
1520 type = current_frame.pop_stack(
1521 VerificationType::double_type(), CHECK_VERIFY(this));
1522 verify_return_value(return_type, type, bci,
1523 ¤t_frame, CHECK_VERIFY(this));
1524 no_control_flow = true; break;
1525 case Bytecodes::_areturn :
1526 type = current_frame.pop_stack(
1527 VerificationType::reference_check(), CHECK_VERIFY(this));
1528 verify_return_value(return_type, type, bci,
1529 ¤t_frame, CHECK_VERIFY(this));
1530 no_control_flow = true; break;
1531 case Bytecodes::_return :
1532 if (return_type != VerificationType::bogus_type()) {
1533 verify_error(ErrorContext::bad_code(bci),
1534 "Method expects a return value");
1535 return;
1536 }
1537 // Make sure "this" has been initialized if current method is an
1538 // <init>
1539 if (_method->name() == vmSymbols::object_initializer_name() &&
1540 current_frame.flag_this_uninit()) {
1541 verify_error(ErrorContext::bad_code(bci),
1542 "Constructor must call super() or this() "
1543 "before return");
1544 return;
1545 }
1546 no_control_flow = true; break;
1547 case Bytecodes::_getstatic :
1548 case Bytecodes::_putstatic :
1549 // pass TRUE, operand can be an array type for getstatic/putstatic.
1550 verify_field_instructions(
1551 &bcs, ¤t_frame, cp, true, CHECK_VERIFY(this));
1552 no_control_flow = false; break;
1553 case Bytecodes::_getfield :
1554 case Bytecodes::_putfield :
1555 // pass FALSE, operand can't be an array type for getfield/putfield.
1556 verify_field_instructions(
1557 &bcs, ¤t_frame, cp, false, CHECK_VERIFY(this));
1558 no_control_flow = false; break;
1559 case Bytecodes::_invokevirtual :
1560 case Bytecodes::_invokespecial :
1561 case Bytecodes::_invokestatic :
1562 verify_invoke_instructions(
1563 &bcs, code_length, ¤t_frame,
1564 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1565 no_control_flow = false; break;
1566 case Bytecodes::_invokeinterface :
1567 case Bytecodes::_invokedynamic :
1568 verify_invoke_instructions(
1569 &bcs, code_length, ¤t_frame,
1570 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1571 no_control_flow = false; break;
1572 case Bytecodes::_new :
1573 {
1574 index = bcs.get_index_u2();
1575 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1576 VerificationType new_class_type =
1577 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1578 if (!new_class_type.is_object()) {
1579 verify_error(ErrorContext::bad_type(bci,
1580 TypeOrigin::cp(index, new_class_type)),
1581 "Illegal new instruction");
1582 return;
1583 }
1584 type = VerificationType::uninitialized_type(bci);
1585 current_frame.push_stack(type, CHECK_VERIFY(this));
1586 no_control_flow = false; break;
1587 }
1588 case Bytecodes::_newarray :
1589 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1590 current_frame.pop_stack(
1591 VerificationType::integer_type(), CHECK_VERIFY(this));
1592 current_frame.push_stack(type, CHECK_VERIFY(this));
1593 no_control_flow = false; break;
1594 case Bytecodes::_anewarray :
1595 verify_anewarray(
1596 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1597 no_control_flow = false; break;
1598 case Bytecodes::_arraylength :
1599 type = current_frame.pop_stack(
1600 VerificationType::reference_check(), CHECK_VERIFY(this));
1601 if (!(type.is_null() || type.is_array())) {
1602 verify_error(ErrorContext::bad_type(
1603 bci, current_frame.stack_top_ctx()),
1604 bad_type_msg, "arraylength");
1605 }
1606 current_frame.push_stack(
1607 VerificationType::integer_type(), CHECK_VERIFY(this));
1608 no_control_flow = false; break;
1609 case Bytecodes::_checkcast :
1610 {
1611 index = bcs.get_index_u2();
1612 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1613 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1614 VerificationType klass_type = cp_index_to_type(
1615 index, cp, CHECK_VERIFY(this));
1616 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1617 no_control_flow = false; break;
1618 }
1619 case Bytecodes::_instanceof : {
1620 index = bcs.get_index_u2();
1621 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1622 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1623 current_frame.push_stack(
1624 VerificationType::integer_type(), CHECK_VERIFY(this));
1625 no_control_flow = false; break;
1626 }
1627 case Bytecodes::_monitorenter :
1628 case Bytecodes::_monitorexit :
1629 current_frame.pop_stack(
1630 VerificationType::reference_check(), CHECK_VERIFY(this));
1631 no_control_flow = false; break;
1632 case Bytecodes::_multianewarray :
1633 {
1634 index = bcs.get_index_u2();
1635 u2 dim = *(bcs.bcp()+3);
1636 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1637 VerificationType new_array_type =
1638 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1639 if (!new_array_type.is_array()) {
1640 verify_error(ErrorContext::bad_type(bci,
1641 TypeOrigin::cp(index, new_array_type)),
1642 "Illegal constant pool index in multianewarray instruction");
1643 return;
1644 }
1645 if (dim < 1 || new_array_type.dimensions() < dim) {
1646 verify_error(ErrorContext::bad_code(bci),
1647 "Illegal dimension in multianewarray instruction: %d", dim);
1648 return;
1649 }
1650 for (int i = 0; i < dim; i++) {
1651 current_frame.pop_stack(
1652 VerificationType::integer_type(), CHECK_VERIFY(this));
1653 }
1654 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1655 no_control_flow = false; break;
1656 }
1657 case Bytecodes::_athrow :
1658 type = VerificationType::reference_type(
1659 vmSymbols::java_lang_Throwable());
1660 current_frame.pop_stack(type, CHECK_VERIFY(this));
1661 no_control_flow = true; break;
1662 default:
1663 // We only need to check the valid bytecodes in class file.
1664 // And jsr and ret are not in the new class file format in JDK1.5.
1665 verify_error(ErrorContext::bad_code(bci),
1666 "Bad instruction: %02x", opcode);
1667 no_control_flow = false;
1668 return;
1669 } // end switch
1670 } // end Merge with the next instruction
1671
1672 // Look for possible jump target in exception handlers and see if it
1673 // matches current_frame
1674 if (bci >= ex_min && bci < ex_max) {
1675 verify_exception_handler_targets(
1676 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1677 }
1678 } // end while
1679
1680 // Make sure that control flow does not fall through end of the method
1681 if (!no_control_flow) {
1682 verify_error(ErrorContext::bad_code(code_length),
1683 "Control flow falls through code end");
1684 return;
1685 }
1686 }
1687
1688 #undef bad_type_message
1689
1690 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1691 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1692 memset(code_data, 0, sizeof(char) * code_length);
1693 RawBytecodeStream bcs(m);
1694
1695 while (!bcs.is_last_bytecode()) {
1696 if (bcs.raw_next() != Bytecodes::_illegal) {
1697 int bci = bcs.bci();
1698 if (bcs.raw_code() == Bytecodes::_new) {
1699 code_data[bci] = NEW_OFFSET;
1700 } else {
1701 code_data[bci] = BYTECODE_OFFSET;
1702 }
1703 } else {
1704 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1705 return NULL;
1706 }
1707 }
1708
1709 return code_data;
1710 }
1711
1712 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1713 ExceptionTable exhandlers(_method());
1714 int exlength = exhandlers.length();
1715 constantPoolHandle cp (THREAD, _method->constants());
1716
1717 for(int i = 0; i < exlength; i++) {
1718 u2 start_pc = exhandlers.start_pc(i);
1719 u2 end_pc = exhandlers.end_pc(i);
1720 u2 handler_pc = exhandlers.handler_pc(i);
1721 if (start_pc >= code_length || code_data[start_pc] == 0) {
1722 class_format_error("Illegal exception table start_pc %d", start_pc);
1723 return;
1724 }
1725 if (end_pc != code_length) { // special case: end_pc == code_length
1726 if (end_pc > code_length || code_data[end_pc] == 0) {
1727 class_format_error("Illegal exception table end_pc %d", end_pc);
1728 return;
1729 }
1730 }
1731 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1732 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1733 return;
1734 }
1735 int catch_type_index = exhandlers.catch_type_index(i);
1736 if (catch_type_index != 0) {
1737 VerificationType catch_type = cp_index_to_type(
1738 catch_type_index, cp, CHECK_VERIFY(this));
1739 VerificationType throwable =
1740 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1741 bool is_subclass = throwable.is_assignable_from(
1742 catch_type, this, false, CHECK_VERIFY(this));
1743 if (!is_subclass) {
1744 // 4286534: should throw VerifyError according to recent spec change
1745 verify_error(ErrorContext::bad_type(handler_pc,
1746 TypeOrigin::cp(catch_type_index, catch_type),
1747 TypeOrigin::implicit(throwable)),
1748 "Catch type is not a subclass "
1749 "of Throwable in exception handler %d", handler_pc);
1750 return;
1751 }
1752 }
1753 if (start_pc < min) min = start_pc;
1754 if (end_pc > max) max = end_pc;
1755 }
1756 }
1757
1758 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1759 int localvariable_table_length = _method()->localvariable_table_length();
1760 if (localvariable_table_length > 0) {
1761 LocalVariableTableElement* table = _method()->localvariable_table_start();
1762 for (int i = 0; i < localvariable_table_length; i++) {
1763 u2 start_bci = table[i].start_bci;
1764 u2 length = table[i].length;
1765
1766 if (start_bci >= code_length || code_data[start_bci] == 0) {
1767 class_format_error(
1768 "Illegal local variable table start_pc %d", start_bci);
1769 return;
1770 }
1771 u4 end_bci = (u4)(start_bci + length);
1772 if (end_bci != code_length) {
1773 if (end_bci >= code_length || code_data[end_bci] == 0) {
1774 class_format_error( "Illegal local variable table length %d", length);
1775 return;
1776 }
1777 }
1778 }
1779 }
1780 }
1781
1782 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1783 StackMapFrame* current_frame,
1784 StackMapTable* stackmap_table,
1785 bool no_control_flow, TRAPS) {
1786 if (stackmap_index < stackmap_table->get_frame_count()) {
1787 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1788 if (no_control_flow && this_offset > bci) {
1789 verify_error(ErrorContext::missing_stackmap(bci),
1790 "Expecting a stack map frame");
1791 return 0;
1792 }
1793 if (this_offset == bci) {
1794 ErrorContext ctx;
1795 // See if current stack map can be assigned to the frame in table.
1796 // current_frame is the stackmap frame got from the last instruction.
1797 // If matched, current_frame will be updated by this method.
1798 bool matches = stackmap_table->match_stackmap(
1799 current_frame, this_offset, stackmap_index,
1800 !no_control_flow, true, false, &ctx, CHECK_VERIFY_(this, 0));
1801 if (!matches) {
1802 // report type error
1803 verify_error(ctx, "Instruction type does not match stack map");
1804 return 0;
1805 }
1806 stackmap_index++;
1807 } else if (this_offset < bci) {
1808 // current_offset should have met this_offset.
1809 class_format_error("Bad stack map offset %d", this_offset);
1810 return 0;
1811 }
1812 } else if (no_control_flow) {
1813 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1814 return 0;
1815 }
1816 return stackmap_index;
1817 }
1818
1819 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1820 StackMapTable* stackmap_table, TRAPS) {
1821 constantPoolHandle cp (THREAD, _method->constants());
1822 ExceptionTable exhandlers(_method());
1823 int exlength = exhandlers.length();
1824 for(int i = 0; i < exlength; i++) {
1825 u2 start_pc = exhandlers.start_pc(i);
1826 u2 end_pc = exhandlers.end_pc(i);
1827 u2 handler_pc = exhandlers.handler_pc(i);
1828 int catch_type_index = exhandlers.catch_type_index(i);
1829 if(bci >= start_pc && bci < end_pc) {
1830 u1 flags = current_frame->flags();
1831 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1832 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1833 if (catch_type_index != 0) {
1834 // We know that this index refers to a subclass of Throwable
1835 VerificationType catch_type = cp_index_to_type(
1836 catch_type_index, cp, CHECK_VERIFY(this));
1837 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1838 } else {
1839 VerificationType throwable =
1840 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1841 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1842 }
1843 ErrorContext ctx;
1844 bool matches = stackmap_table->match_stackmap(
1845 new_frame, handler_pc, true, false, true, &ctx, CHECK_VERIFY(this));
1846 if (!matches) {
1847 verify_error(ctx, "Stack map does not match the one at "
1848 "exception handler %d", handler_pc);
1849 return;
1850 }
1851 }
1852 }
1853 }
1854
1855 void ClassVerifier::verify_cp_index(
1856 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1857 int nconstants = cp->length();
1858 if ((index <= 0) || (index >= nconstants)) {
1859 verify_error(ErrorContext::bad_cp_index(bci, index),
1860 "Illegal constant pool index %d in class %s",
1861 index, cp->pool_holder()->external_name());
1862 return;
1863 }
1864 }
1865
1866 void ClassVerifier::verify_cp_type(
1867 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1868
1869 // In some situations, bytecode rewriting may occur while we're verifying.
1870 // In this case, a constant pool cache exists and some indices refer to that
1871 // instead. Be sure we don't pick up such indices by accident.
1872 // We must check was_recursively_verified() before we get here.
1873 guarantee(cp->cache() == NULL, "not rewritten yet");
1874
1875 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1876 unsigned int tag = cp->tag_at(index).value();
1877 if ((types & (1 << tag)) == 0) {
1878 verify_error(ErrorContext::bad_cp_index(bci, index),
1879 "Illegal type at constant pool entry %d in class %s",
1880 index, cp->pool_holder()->external_name());
1881 return;
1882 }
1883 }
1884
1885 void ClassVerifier::verify_cp_class_type(
1886 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1887 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1888 constantTag tag = cp->tag_at(index);
1889 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1890 verify_error(ErrorContext::bad_cp_index(bci, index),
1891 "Illegal type at constant pool entry %d in class %s",
1892 index, cp->pool_holder()->external_name());
1893 return;
1894 }
1895 }
1896
1897 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1898 stringStream ss;
1899
1900 ctx.reset_frames();
1901 _exception_type = vmSymbols::java_lang_VerifyError();
1902 _error_context = ctx;
1903 va_list va;
1904 va_start(va, msg);
1905 ss.vprint(msg, va);
1906 va_end(va);
1907 _message = ss.as_string();
1908 #ifdef ASSERT
1909 ResourceMark rm;
1910 const char* exception_name = _exception_type->as_C_string();
1911 Exceptions::debug_check_abort(exception_name, NULL);
1912 #endif // ndef ASSERT
1913 }
1914
1915 void ClassVerifier::class_format_error(const char* msg, ...) {
1916 stringStream ss;
1917 _exception_type = vmSymbols::java_lang_ClassFormatError();
1918 va_list va;
1919 va_start(va, msg);
1920 ss.vprint(msg, va);
1921 va_end(va);
1922 if (!_method.is_null()) {
1923 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1924 }
1925 _message = ss.as_string();
1926 }
1927
1928 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1929 // Get current loader and protection domain first.
1930 oop loader = current_class()->class_loader();
1931 oop protection_domain = current_class()->protection_domain();
1932
1933 return SystemDictionary::resolve_or_fail(
1934 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1935 true, THREAD);
1936 }
1937
1938 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1939 Klass* target_class,
1940 Symbol* field_name,
1941 Symbol* field_sig,
1942 bool is_method) {
1943 No_Safepoint_Verifier nosafepoint;
1944
1945 // If target class isn't a super class of this class, we don't worry about this case
1946 if (!this_class->is_subclass_of(target_class)) {
1947 return false;
1948 }
1949 // Check if the specified method or field is protected
1950 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1951 fieldDescriptor fd;
1952 if (is_method) {
1953 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::normal);
1954 if (m != NULL && m->is_protected()) {
1955 if (!this_class->is_same_class_package(m->method_holder())) {
1956 return true;
1957 }
1958 }
1959 } else {
1960 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1961 if (member_klass != NULL && fd.is_protected()) {
1962 if (!this_class->is_same_class_package(member_klass)) {
1963 return true;
1964 }
1965 }
1966 }
1967 return false;
1968 }
1969
1970 void ClassVerifier::verify_ldc(
1971 int opcode, u2 index, StackMapFrame* current_frame,
1972 constantPoolHandle cp, u2 bci, TRAPS) {
1973 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1974 constantTag tag = cp->tag_at(index);
1975 unsigned int types;
1976 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1977 if (!tag.is_unresolved_klass()) {
1978 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1979 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1980 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1981 // Note: The class file parser already verified the legality of
1982 // MethodHandle and MethodType constants.
1983 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1984 }
1985 } else {
1986 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1987 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1988 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1989 }
1990 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1991 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1992 } else if (tag.is_string()) {
1993 current_frame->push_stack(
1994 VerificationType::reference_type(
1995 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1996 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1997 current_frame->push_stack(
1998 VerificationType::reference_type(
1999 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
2000 } else if (tag.is_int()) {
2001 current_frame->push_stack(
2002 VerificationType::integer_type(), CHECK_VERIFY(this));
2003 } else if (tag.is_float()) {
2004 current_frame->push_stack(
2005 VerificationType::float_type(), CHECK_VERIFY(this));
2006 } else if (tag.is_double()) {
2007 current_frame->push_stack_2(
2008 VerificationType::double_type(),
2009 VerificationType::double2_type(), CHECK_VERIFY(this));
2010 } else if (tag.is_long()) {
2011 current_frame->push_stack_2(
2012 VerificationType::long_type(),
2013 VerificationType::long2_type(), CHECK_VERIFY(this));
2014 } else if (tag.is_method_handle()) {
2015 current_frame->push_stack(
2016 VerificationType::reference_type(
2017 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2018 } else if (tag.is_method_type()) {
2019 current_frame->push_stack(
2020 VerificationType::reference_type(
2021 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2022 } else {
2023 /* Unreachable? verify_cp_type has already validated the cp type. */
2024 verify_error(
2025 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2026 return;
2027 }
2028 }
2029
2030 void ClassVerifier::verify_switch(
2031 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2032 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2033 int bci = bcs->bci();
2034 address bcp = bcs->bcp();
2035 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2036
2037 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2038 // 4639449 & 4647081: padding bytes must be 0
2039 u2 padding_offset = 1;
2040 while ((bcp + padding_offset) < aligned_bcp) {
2041 if(*(bcp + padding_offset) != 0) {
2042 verify_error(ErrorContext::bad_code(bci),
2043 "Nonzero padding byte in lookupswitch or tableswitch");
2044 return;
2045 }
2046 padding_offset++;
2047 }
2048 }
2049
2050 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2051 int keys, delta;
2052 current_frame->pop_stack(
2053 VerificationType::integer_type(), CHECK_VERIFY(this));
2054 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2055 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2056 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2057 if (low > high) {
2058 verify_error(ErrorContext::bad_code(bci),
2059 "low must be less than or equal to high in tableswitch");
2060 return;
2061 }
2062 keys = high - low + 1;
2063 if (keys < 0) {
2064 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2065 return;
2066 }
2067 delta = 1;
2068 } else {
2069 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2070 if (keys < 0) {
2071 verify_error(ErrorContext::bad_code(bci),
2072 "number of keys in lookupswitch less than 0");
2073 return;
2074 }
2075 delta = 2;
2076 // Make sure that the lookupswitch items are sorted
2077 for (int i = 0; i < (keys - 1); i++) {
2078 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2079 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2080 if (this_key >= next_key) {
2081 verify_error(ErrorContext::bad_code(bci),
2082 "Bad lookupswitch instruction");
2083 return;
2084 }
2085 }
2086 }
2087 int target = bci + default_offset;
2088 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2089 for (int i = 0; i < keys; i++) {
2090 // Because check_jump_target() may safepoint, the bytecode could have
2091 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2092 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2093 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2094 stackmap_table->check_jump_target(
2095 current_frame, target, CHECK_VERIFY(this));
2096 }
2097 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2098 }
2099
2100 bool ClassVerifier::name_in_supers(
2101 Symbol* ref_name, instanceKlassHandle current) {
2102 Klass* super = current->super();
2103 while (super != NULL) {
2104 if (super->name() == ref_name) {
2105 return true;
2106 }
2107 super = super->super();
2108 }
2109 return false;
2110 }
2111
2112 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2113 StackMapFrame* current_frame,
2114 constantPoolHandle cp,
2115 bool allow_arrays,
2116 TRAPS) {
2117 u2 index = bcs->get_index_u2();
2118 verify_cp_type(bcs->bci(), index, cp,
2119 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2120
2121 // Get field name and signature
2122 Symbol* field_name = cp->name_ref_at(index);
2123 Symbol* field_sig = cp->signature_ref_at(index);
2124
2125 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2126 class_format_error(
2127 "Invalid signature for field in class %s referenced "
2128 "from constant pool index %d", _klass->external_name(), index);
2129 return;
2130 }
2131
2132 // Get referenced class type
2133 VerificationType ref_class_type = cp_ref_index_to_type(
2134 index, cp, CHECK_VERIFY(this));
2135 if (!ref_class_type.is_object() &&
2136 (!allow_arrays || !ref_class_type.is_array())) {
2137 verify_error(ErrorContext::bad_type(bcs->bci(),
2138 TypeOrigin::cp(index, ref_class_type)),
2139 "Expecting reference to class in class %s at constant pool index %d",
2140 _klass->external_name(), index);
2141 return;
2142 }
2143 VerificationType target_class_type = ref_class_type;
2144
2145 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2146 "buffer type must match VerificationType size");
2147 uintptr_t field_type_buffer[2];
2148 VerificationType* field_type = (VerificationType*)field_type_buffer;
2149 // If we make a VerificationType[2] array directly, the compiler calls
2150 // to the c-runtime library to do the allocation instead of just
2151 // stack allocating it. Plus it would run constructors. This shows up
2152 // in performance profiles.
2153
2154 SignatureStream sig_stream(field_sig, false);
2155 VerificationType stack_object_type;
2156 int n = change_sig_to_verificationType(
2157 &sig_stream, field_type, CHECK_VERIFY(this));
2158 u2 bci = bcs->bci();
2159 bool is_assignable;
2160 switch (bcs->raw_code()) {
2161 case Bytecodes::_getstatic: {
2162 for (int i = 0; i < n; i++) {
2163 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2164 }
2165 break;
2166 }
2167 case Bytecodes::_putstatic: {
2168 for (int i = n - 1; i >= 0; i--) {
2169 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2170 }
2171 break;
2172 }
2173 case Bytecodes::_getfield: {
2174 stack_object_type = current_frame->pop_stack(
2175 target_class_type, CHECK_VERIFY(this));
2176 for (int i = 0; i < n; i++) {
2177 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2178 }
2179 goto check_protected;
2180 }
2181 case Bytecodes::_putfield: {
2182 for (int i = n - 1; i >= 0; i--) {
2183 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2184 }
2185 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2186
2187 // The JVMS 2nd edition allows field initialization before the superclass
2188 // initializer, if the field is defined within the current class.
2189 fieldDescriptor fd;
2190 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2191 target_class_type.equals(current_type()) &&
2192 _klass->find_local_field(field_name, field_sig, &fd)) {
2193 stack_object_type = current_type();
2194 }
2195 is_assignable = target_class_type.is_assignable_from(
2196 stack_object_type, this, false, CHECK_VERIFY(this));
2197 if (!is_assignable) {
2198 verify_error(ErrorContext::bad_type(bci,
2199 current_frame->stack_top_ctx(),
2200 TypeOrigin::cp(index, target_class_type)),
2201 "Bad type on operand stack in putfield");
2202 return;
2203 }
2204 }
2205 check_protected: {
2206 if (_this_type == stack_object_type)
2207 break; // stack_object_type must be assignable to _current_class_type
2208 Symbol* ref_class_name =
2209 cp->klass_name_at(cp->klass_ref_index_at(index));
2210 if (!name_in_supers(ref_class_name, current_class()))
2211 // stack_object_type must be assignable to _current_class_type since:
2212 // 1. stack_object_type must be assignable to ref_class.
2213 // 2. ref_class must be _current_class or a subclass of it. It can't
2214 // be a superclass of it. See revised JVMS 5.4.4.
2215 break;
2216
2217 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2218 if (is_protected_access(current_class(), ref_class_oop, field_name,
2219 field_sig, false)) {
2220 // It's protected access, check if stack object is assignable to
2221 // current class.
2222 is_assignable = current_type().is_assignable_from(
2223 stack_object_type, this, true, CHECK_VERIFY(this));
2224 if (!is_assignable) {
2225 verify_error(ErrorContext::bad_type(bci,
2226 current_frame->stack_top_ctx(),
2227 TypeOrigin::implicit(current_type())),
2228 "Bad access to protected data in getfield");
2229 return;
2230 }
2231 }
2232 break;
2233 }
2234 default: ShouldNotReachHere();
2235 }
2236 }
2237
2238 // Look at the method's handlers. If the bci is in the handler's try block
2239 // then check if the handler_pc is already on the stack. If not, push it.
2240 void ClassVerifier::push_handlers(ExceptionTable* exhandlers,
2241 GrowableArray<u4>* handler_stack,
2242 u4 bci) {
2243 int exlength = exhandlers->length();
2244 for(int x = 0; x < exlength; x++) {
2245 if (bci >= exhandlers->start_pc(x) && bci < exhandlers->end_pc(x)) {
2246 handler_stack->append_if_missing(exhandlers->handler_pc(x));
2247 }
2248 }
2249 }
2250
2251 // Return TRUE if all code paths starting with start_bc_offset end in
2252 // bytecode athrow or loop.
2253 bool ClassVerifier::ends_in_athrow(u4 start_bc_offset) {
2254 ResourceMark rm;
2255 // Create bytecode stream.
2256 RawBytecodeStream bcs(method());
2257 u4 code_length = method()->code_size();
2258 bcs.set_start(start_bc_offset);
2259 u4 target;
2260 // Create stack for storing bytecode start offsets for if* and *switch.
2261 GrowableArray<u4>* bci_stack = new GrowableArray<u4>(30);
2262 // Create stack for handlers for try blocks containing this handler.
2263 GrowableArray<u4>* handler_stack = new GrowableArray<u4>(30);
2264 // Create list of visited branch opcodes (goto* and if*).
2265 GrowableArray<u4>* visited_branches = new GrowableArray<u4>(30);
2266 ExceptionTable exhandlers(_method());
2267
2268 while (true) {
2269 if (bcs.is_last_bytecode()) {
2270 // if no more starting offsets to parse or if at the end of the
2271 // method then return false.
2272 if ((bci_stack->is_empty()) || ((u4)bcs.end_bci() == code_length))
2273 return false;
2274 // Pop a bytecode starting offset and scan from there.
2275 bcs.set_start(bci_stack->pop());
2276 }
2277 Bytecodes::Code opcode = bcs.raw_next();
2278 u4 bci = bcs.bci();
2279
2280 // If the bytecode is in a TRY block, push its handlers so they
2281 // will get parsed.
2282 push_handlers(&exhandlers, handler_stack, bci);
2283
2284 switch (opcode) {
2285 case Bytecodes::_if_icmpeq:
2286 case Bytecodes::_if_icmpne:
2287 case Bytecodes::_if_icmplt:
2288 case Bytecodes::_if_icmpge:
2289 case Bytecodes::_if_icmpgt:
2290 case Bytecodes::_if_icmple:
2291 case Bytecodes::_ifeq:
2292 case Bytecodes::_ifne:
2293 case Bytecodes::_iflt:
2294 case Bytecodes::_ifge:
2295 case Bytecodes::_ifgt:
2296 case Bytecodes::_ifle:
2297 case Bytecodes::_if_acmpeq:
2298 case Bytecodes::_if_acmpne:
2299 case Bytecodes::_ifnull:
2300 case Bytecodes::_ifnonnull:
2301 target = bcs.dest();
2302 if (visited_branches->contains(bci)) {
2303 if (bci_stack->is_empty()) return true;
2304 // Pop a bytecode starting offset and scan from there.
2305 bcs.set_start(bci_stack->pop());
2306 } else {
2307 if (target > bci) { // forward branch
2308 if (target >= code_length) return false;
2309 // Push the branch target onto the stack.
2310 bci_stack->push(target);
2311 // then, scan bytecodes starting with next.
2312 bcs.set_start(bcs.next_bci());
2313 } else { // backward branch
2314 // Push bytecode offset following backward branch onto the stack.
2315 bci_stack->push(bcs.next_bci());
2316 // Check bytecodes starting with branch target.
2317 bcs.set_start(target);
2318 }
2319 // Record target so we don't branch here again.
2320 visited_branches->append(bci);
2321 }
2322 break;
2323
2324 case Bytecodes::_goto:
2325 case Bytecodes::_goto_w:
2326 target = (opcode == Bytecodes::_goto ? bcs.dest() : bcs.dest_w());
2327 if (visited_branches->contains(bci)) {
2328 if (bci_stack->is_empty()) return true;
2329 // Been here before, pop new starting offset from stack.
2330 bcs.set_start(bci_stack->pop());
2331 } else {
2332 if (target >= code_length) return false;
2333 // Continue scanning from the target onward.
2334 bcs.set_start(target);
2335 // Record target so we don't branch here again.
2336 visited_branches->append(bci);
2337 }
2338 break;
2339
2340 // Check that all switch alternatives end in 'athrow' bytecodes. Since it
2341 // is difficult to determine where each switch alternative ends, parse
2342 // each switch alternative until either hit a 'return', 'athrow', or reach
2343 // the end of the method's bytecodes. This is gross but should be okay
2344 // because:
2345 // 1. tableswitch and lookupswitch byte codes in handlers for ctor explicit
2346 // constructor invocations should be rare.
2347 // 2. if each switch alternative ends in an athrow then the parsing should be
2348 // short. If there is no athrow then it is bogus code, anyway.
2349 case Bytecodes::_lookupswitch:
2350 case Bytecodes::_tableswitch:
2351 {
2352 address aligned_bcp = (address) round_to((intptr_t)(bcs.bcp() + 1), jintSize);
2353 u4 default_offset = Bytes::get_Java_u4(aligned_bcp) + bci;
2354 int keys, delta;
2355 if (opcode == Bytecodes::_tableswitch) {
2356 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2357 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2358 // This is invalid, but let the regular bytecode verifier
2359 // report this because the user will get a better error message.
2360 if (low > high) return true;
2361 keys = high - low + 1;
2362 delta = 1;
2363 } else {
2364 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2365 delta = 2;
2366 }
2367 // Invalid, let the regular bytecode verifier deal with it.
2368 if (keys < 0) return true;
2369
2370 // Push the offset of the next bytecode onto the stack.
2371 bci_stack->push(bcs.next_bci());
2372
2373 // Push the switch alternatives onto the stack.
2374 for (int i = 0; i < keys; i++) {
2375 u4 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2376 if (target > code_length) return false;
2377 bci_stack->push(target);
2378 }
2379
2380 // Start bytecode parsing for the switch at the default alternative.
2381 if (default_offset > code_length) return false;
2382 bcs.set_start(default_offset);
2383 break;
2384 }
2385
2386 case Bytecodes::_return:
2387 return false;
2388
2389 case Bytecodes::_athrow:
2390 {
2391 if (bci_stack->is_empty()) {
2392 if (handler_stack->is_empty()) {
2393 return true;
2394 } else {
2395 // Parse the catch handlers for try blocks containing athrow.
2396 bcs.set_start(handler_stack->pop());
2397 }
2398 } else {
2399 // Pop a bytecode offset and starting scanning from there.
2400 bcs.set_start(bci_stack->pop());
2401 }
2402 }
2403 break;
2404
2405 default:
2406 ;
2407 } // end switch
2408 } // end while loop
2409
2410 return false;
2411 }
2412
2413 void ClassVerifier::verify_invoke_init(
2414 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2415 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2416 constantPoolHandle cp, TRAPS) {
2417 u2 bci = bcs->bci();
2418 VerificationType type = current_frame->pop_stack(
2419 VerificationType::reference_check(), CHECK_VERIFY(this));
2420 if (type == VerificationType::uninitialized_this_type()) {
2421 // The method must be an <init> method of this class or its superclass
2422 Klass* superk = current_class()->super();
2423 if (ref_class_type.name() != current_class()->name() &&
2424 ref_class_type.name() != superk->name()) {
2425 verify_error(ErrorContext::bad_type(bci,
2426 TypeOrigin::implicit(ref_class_type),
2427 TypeOrigin::implicit(current_type())),
2428 "Bad <init> method call");
2429 return;
2430 }
2431
2432 // Check if this call is done from inside of a TRY block. If so, make
2433 // sure that all catch clause paths end in a throw. Otherwise, this
2434 // can result in returning an incomplete object.
2435 ExceptionTable exhandlers(_method());
2436 int exlength = exhandlers.length();
2437 for(int i = 0; i < exlength; i++) {
2438 u2 start_pc = exhandlers.start_pc(i);
2439 u2 end_pc = exhandlers.end_pc(i);
2440
2441 if (bci >= start_pc && bci < end_pc) {
2442 if (!ends_in_athrow(exhandlers.handler_pc(i))) {
2443 verify_error(ErrorContext::bad_code(bci),
2444 "Bad <init> method call from after the start of a try block");
2445 return;
2446 } else if (VerboseVerification) {
2447 ResourceMark rm;
2448 tty->print_cr(
2449 "Survived call to ends_in_athrow(): %s",
2450 current_class()->name()->as_C_string());
2451 }
2452 }
2453 }
2454
2455 current_frame->initialize_object(type, current_type());
2456 *this_uninit = true;
2457 } else if (type.is_uninitialized()) {
2458 u2 new_offset = type.bci();
2459 address new_bcp = bcs->bcp() - bci + new_offset;
2460 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2461 /* Unreachable? Stack map parsing ensures valid type and new
2462 * instructions have a valid BCI. */
2463 verify_error(ErrorContext::bad_code(new_offset),
2464 "Expecting new instruction");
2465 return;
2466 }
2467 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2468 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2469
2470 // The method must be an <init> method of the indicated class
2471 VerificationType new_class_type = cp_index_to_type(
2472 new_class_index, cp, CHECK_VERIFY(this));
2473 if (!new_class_type.equals(ref_class_type)) {
2474 verify_error(ErrorContext::bad_type(bci,
2475 TypeOrigin::cp(new_class_index, new_class_type),
2476 TypeOrigin::cp(ref_class_index, ref_class_type)),
2477 "Call to wrong <init> method");
2478 return;
2479 }
2480 // According to the VM spec, if the referent class is a superclass of the
2481 // current class, and is in a different runtime package, and the method is
2482 // protected, then the objectref must be the current class or a subclass
2483 // of the current class.
2484 VerificationType objectref_type = new_class_type;
2485 if (name_in_supers(ref_class_type.name(), current_class())) {
2486 Klass* ref_klass = load_class(ref_class_type.name(), CHECK);
2487 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2488 vmSymbols::object_initializer_name(),
2489 cp->signature_ref_at(bcs->get_index_u2()),
2490 Klass::normal);
2491 // Do nothing if method is not found. Let resolution detect the error.
2492 if (m != NULL) {
2493 instanceKlassHandle mh(THREAD, m->method_holder());
2494 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2495 bool assignable = current_type().is_assignable_from(
2496 objectref_type, this, true, CHECK_VERIFY(this));
2497 if (!assignable) {
2498 verify_error(ErrorContext::bad_type(bci,
2499 TypeOrigin::cp(new_class_index, objectref_type),
2500 TypeOrigin::implicit(current_type())),
2501 "Bad access to protected <init> method");
2502 return;
2503 }
2504 }
2505 }
2506 }
2507 current_frame->initialize_object(type, new_class_type);
2508 } else {
2509 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2510 "Bad operand type when invoking <init>");
2511 return;
2512 }
2513 }
2514
2515 bool ClassVerifier::is_same_or_direct_interface(
2516 instanceKlassHandle klass,
2517 VerificationType klass_type,
2518 VerificationType ref_class_type) {
2519 if (ref_class_type.equals(klass_type)) return true;
2520 Array<Klass*>* local_interfaces = klass->local_interfaces();
2521 if (local_interfaces != NULL) {
2522 for (int x = 0; x < local_interfaces->length(); x++) {
2523 Klass* k = local_interfaces->at(x);
2524 assert (k != NULL && k->is_interface(), "invalid interface");
2525 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2526 return true;
2527 }
2528 }
2529 }
2530 return false;
2531 }
2532
2533 void ClassVerifier::verify_invoke_instructions(
2534 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2535 bool *this_uninit, VerificationType return_type,
2536 constantPoolHandle cp, TRAPS) {
2537 // Make sure the constant pool item is the right type
2538 u2 index = bcs->get_index_u2();
2539 Bytecodes::Code opcode = bcs->raw_code();
2540 unsigned int types;
2541 switch (opcode) {
2542 case Bytecodes::_invokeinterface:
2543 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2544 break;
2545 case Bytecodes::_invokedynamic:
2546 types = 1 << JVM_CONSTANT_InvokeDynamic;
2547 break;
2548 case Bytecodes::_invokespecial:
2549 case Bytecodes::_invokestatic:
2550 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2551 (1 << JVM_CONSTANT_Methodref) :
2552 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2553 break;
2554 default:
2555 types = 1 << JVM_CONSTANT_Methodref;
2556 }
2557 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2558
2559 // Get method name and signature
2560 Symbol* method_name = cp->name_ref_at(index);
2561 Symbol* method_sig = cp->signature_ref_at(index);
2562
2563 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2564 class_format_error(
2565 "Invalid method signature in class %s referenced "
2566 "from constant pool index %d", _klass->external_name(), index);
2567 return;
2568 }
2569
2570 // Get referenced class type
2571 VerificationType ref_class_type;
2572 if (opcode == Bytecodes::_invokedynamic) {
2573 if (_klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2574 class_format_error(
2575 "invokedynamic instructions not supported by this class file version (%d), class %s",
2576 _klass->major_version(), _klass->external_name());
2577 return;
2578 }
2579 } else {
2580 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2581 }
2582
2583 // For a small signature length, we just allocate 128 bytes instead
2584 // of parsing the signature once to find its size.
2585 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2586 // longs/doubles to be consertive.
2587 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2588 "buffer type must match VerificationType size");
2589 uintptr_t on_stack_sig_types_buffer[128];
2590 // If we make a VerificationType[128] array directly, the compiler calls
2591 // to the c-runtime library to do the allocation instead of just
2592 // stack allocating it. Plus it would run constructors. This shows up
2593 // in performance profiles.
2594
2595 VerificationType* sig_types;
2596 int size = (method_sig->utf8_length() - 3) * 2;
2597 if (size > 128) {
2598 // Long and double occupies two slots here.
2599 ArgumentSizeComputer size_it(method_sig);
2600 size = size_it.size();
2601 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2602 } else{
2603 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2604 }
2605 SignatureStream sig_stream(method_sig);
2606 int sig_i = 0;
2607 while (!sig_stream.at_return_type()) {
2608 sig_i += change_sig_to_verificationType(
2609 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2610 sig_stream.next();
2611 }
2612 int nargs = sig_i;
2613
2614 #ifdef ASSERT
2615 {
2616 ArgumentSizeComputer size_it(method_sig);
2617 assert(nargs == size_it.size(), "Argument sizes do not match");
2618 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2619 }
2620 #endif
2621
2622 // Check instruction operands
2623 u2 bci = bcs->bci();
2624 if (opcode == Bytecodes::_invokeinterface) {
2625 address bcp = bcs->bcp();
2626 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2627 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2628 // the difference between the size of the operand stack before and after the instruction
2629 // executes.
2630 if (*(bcp+3) != (nargs+1)) {
2631 verify_error(ErrorContext::bad_code(bci),
2632 "Inconsistent args count operand in invokeinterface");
2633 return;
2634 }
2635 if (*(bcp+4) != 0) {
2636 verify_error(ErrorContext::bad_code(bci),
2637 "Fourth operand byte of invokeinterface must be zero");
2638 return;
2639 }
2640 }
2641
2642 if (opcode == Bytecodes::_invokedynamic) {
2643 address bcp = bcs->bcp();
2644 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2645 verify_error(ErrorContext::bad_code(bci),
2646 "Third and fourth operand bytes of invokedynamic must be zero");
2647 return;
2648 }
2649 }
2650
2651 if (method_name->byte_at(0) == '<') {
2652 // Make sure <init> can only be invoked by invokespecial
2653 if (opcode != Bytecodes::_invokespecial ||
2654 method_name != vmSymbols::object_initializer_name()) {
2655 verify_error(ErrorContext::bad_code(bci),
2656 "Illegal call to internal method");
2657 return;
2658 }
2659 } else if (opcode == Bytecodes::_invokespecial
2660 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2661 && !ref_class_type.equals(VerificationType::reference_type(
2662 current_class()->super()->name()))) {
2663 bool subtype = false;
2664 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2665 if (!current_class()->is_anonymous()) {
2666 subtype = ref_class_type.is_assignable_from(
2667 current_type(), this, false, CHECK_VERIFY(this));
2668 } else {
2669 VerificationType host_klass_type =
2670 VerificationType::reference_type(current_class()->host_klass()->name());
2671 subtype = ref_class_type.is_assignable_from(host_klass_type, this, false, CHECK_VERIFY(this));
2672
2673 // If invokespecial of IMR, need to recheck for same or
2674 // direct interface relative to the host class
2675 have_imr_indirect = (have_imr_indirect &&
2676 !is_same_or_direct_interface(
2677 InstanceKlass::cast(current_class()->host_klass()),
2678 host_klass_type, ref_class_type));
2679 }
2680 if (!subtype) {
2681 verify_error(ErrorContext::bad_code(bci),
2682 "Bad invokespecial instruction: "
2683 "current class isn't assignable to reference class.");
2684 return;
2685 } else if (have_imr_indirect) {
2686 verify_error(ErrorContext::bad_code(bci),
2687 "Bad invokespecial instruction: "
2688 "interface method reference is in an indirect superinterface.");
2689 return;
2690 }
2691
2692 }
2693 // Match method descriptor with operand stack
2694 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2695 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2696 }
2697 // Check objectref on operand stack
2698 if (opcode != Bytecodes::_invokestatic &&
2699 opcode != Bytecodes::_invokedynamic) {
2700 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2701 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2702 code_length, this_uninit, cp, CHECK_VERIFY(this));
2703 } else { // other methods
2704 // Ensures that target class is assignable to method class.
2705 if (opcode == Bytecodes::_invokespecial) {
2706 if (!current_class()->is_anonymous()) {
2707 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2708 } else {
2709 // anonymous class invokespecial calls: check if the
2710 // objectref is a subtype of the host_klass of the current class
2711 // to allow an anonymous class to reference methods in the host_klass
2712 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2713 VerificationType hosttype =
2714 VerificationType::reference_type(current_class()->host_klass()->name());
2715 bool subtype = hosttype.is_assignable_from(top, this, false, CHECK_VERIFY(this));
2716 if (!subtype) {
2717 verify_error( ErrorContext::bad_type(current_frame->offset(),
2718 current_frame->stack_top_ctx(),
2719 TypeOrigin::implicit(top)),
2720 "Bad type on operand stack");
2721 return;
2722 }
2723 }
2724 } else if (opcode == Bytecodes::_invokevirtual) {
2725 VerificationType stack_object_type =
2726 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2727 if (current_type() != stack_object_type) {
2728 assert(cp->cache() == NULL, "not rewritten yet");
2729 Symbol* ref_class_name =
2730 cp->klass_name_at(cp->klass_ref_index_at(index));
2731 // See the comments in verify_field_instructions() for
2732 // the rationale behind this.
2733 if (name_in_supers(ref_class_name, current_class())) {
2734 Klass* ref_class = load_class(ref_class_name, CHECK);
2735 if (is_protected_access(
2736 _klass, ref_class, method_name, method_sig, true)) {
2737 // It's protected access, check if stack object is
2738 // assignable to current class.
2739 bool is_assignable = current_type().is_assignable_from(
2740 stack_object_type, this, true, CHECK_VERIFY(this));
2741 if (!is_assignable) {
2742 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2743 && stack_object_type.is_array()
2744 && method_name == vmSymbols::clone_name()) {
2745 // Special case: arrays pretend to implement public Object
2746 // clone().
2747 } else {
2748 verify_error(ErrorContext::bad_type(bci,
2749 current_frame->stack_top_ctx(),
2750 TypeOrigin::implicit(current_type())),
2751 "Bad access to protected data in invokevirtual");
2752 return;
2753 }
2754 }
2755 }
2756 }
2757 }
2758 } else {
2759 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2760 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2761 }
2762 }
2763 }
2764 // Push the result type.
2765 if (sig_stream.type() != T_VOID) {
2766 if (method_name == vmSymbols::object_initializer_name()) {
2767 // <init> method must have a void return type
2768 /* Unreachable? Class file parser verifies that methods with '<' have
2769 * void return */
2770 verify_error(ErrorContext::bad_code(bci),
2771 "Return type must be void in <init> method");
2772 return;
2773 }
2774 VerificationType return_type[2];
2775 int n = change_sig_to_verificationType(
2776 &sig_stream, return_type, CHECK_VERIFY(this));
2777 for (int i = 0; i < n; i++) {
2778 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2779 }
2780 }
2781 }
2782
2783 VerificationType ClassVerifier::get_newarray_type(
2784 u2 index, u2 bci, TRAPS) {
2785 const char* from_bt[] = {
2786 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2787 };
2788 if (index < T_BOOLEAN || index > T_LONG) {
2789 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2790 return VerificationType::bogus_type();
2791 }
2792
2793 // from_bt[index] contains the array signature which has a length of 2
2794 Symbol* sig = create_temporary_symbol(
2795 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2796 return VerificationType::reference_type(sig);
2797 }
2798
2799 void ClassVerifier::verify_anewarray(
2800 u2 bci, u2 index, constantPoolHandle cp,
2801 StackMapFrame* current_frame, TRAPS) {
2802 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2803 current_frame->pop_stack(
2804 VerificationType::integer_type(), CHECK_VERIFY(this));
2805
2806 VerificationType component_type =
2807 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2808 int length;
2809 char* arr_sig_str;
2810 if (component_type.is_array()) { // it's an array
2811 const char* component_name = component_type.name()->as_utf8();
2812 // add one dimension to component
2813 length = (int)strlen(component_name) + 1;
2814 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2815 arr_sig_str[0] = '[';
2816 strncpy(&arr_sig_str[1], component_name, length - 1);
2817 } else { // it's an object or interface
2818 const char* component_name = component_type.name()->as_utf8();
2819 // add one dimension to component with 'L' prepended and ';' postpended.
2820 length = (int)strlen(component_name) + 3;
2821 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2822 arr_sig_str[0] = '[';
2823 arr_sig_str[1] = 'L';
2824 strncpy(&arr_sig_str[2], component_name, length - 2);
2825 arr_sig_str[length - 1] = ';';
2826 }
2827 Symbol* arr_sig = create_temporary_symbol(
2828 arr_sig_str, length, CHECK_VERIFY(this));
2829 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2830 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2831 }
2832
2833 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2834 current_frame->get_local(
2835 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2836 current_frame->push_stack(
2837 VerificationType::integer_type(), CHECK_VERIFY(this));
2838 }
2839
2840 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2841 current_frame->get_local_2(
2842 index, VerificationType::long_type(),
2843 VerificationType::long2_type(), CHECK_VERIFY(this));
2844 current_frame->push_stack_2(
2845 VerificationType::long_type(),
2846 VerificationType::long2_type(), CHECK_VERIFY(this));
2847 }
2848
2849 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2850 current_frame->get_local(
2851 index, VerificationType::float_type(), CHECK_VERIFY(this));
2852 current_frame->push_stack(
2853 VerificationType::float_type(), CHECK_VERIFY(this));
2854 }
2855
2856 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2857 current_frame->get_local_2(
2858 index, VerificationType::double_type(),
2859 VerificationType::double2_type(), CHECK_VERIFY(this));
2860 current_frame->push_stack_2(
2861 VerificationType::double_type(),
2862 VerificationType::double2_type(), CHECK_VERIFY(this));
2863 }
2864
2865 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2866 VerificationType type = current_frame->get_local(
2867 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2868 current_frame->push_stack(type, CHECK_VERIFY(this));
2869 }
2870
2871 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2872 current_frame->pop_stack(
2873 VerificationType::integer_type(), CHECK_VERIFY(this));
2874 current_frame->set_local(
2875 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2876 }
2877
2878 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2879 current_frame->pop_stack_2(
2880 VerificationType::long2_type(),
2881 VerificationType::long_type(), CHECK_VERIFY(this));
2882 current_frame->set_local_2(
2883 index, VerificationType::long_type(),
2884 VerificationType::long2_type(), CHECK_VERIFY(this));
2885 }
2886
2887 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2888 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2889 current_frame->set_local(
2890 index, VerificationType::float_type(), CHECK_VERIFY(this));
2891 }
2892
2893 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2894 current_frame->pop_stack_2(
2895 VerificationType::double2_type(),
2896 VerificationType::double_type(), CHECK_VERIFY(this));
2897 current_frame->set_local_2(
2898 index, VerificationType::double_type(),
2899 VerificationType::double2_type(), CHECK_VERIFY(this));
2900 }
2901
2902 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2903 VerificationType type = current_frame->pop_stack(
2904 VerificationType::reference_check(), CHECK_VERIFY(this));
2905 current_frame->set_local(index, type, CHECK_VERIFY(this));
2906 }
2907
2908 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2909 VerificationType type = current_frame->get_local(
2910 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2911 current_frame->set_local(index, type, CHECK_VERIFY(this));
2912 }
2913
2914 void ClassVerifier::verify_return_value(
2915 VerificationType return_type, VerificationType type, u2 bci,
2916 StackMapFrame* current_frame, TRAPS) {
2917 if (return_type == VerificationType::bogus_type()) {
2918 verify_error(ErrorContext::bad_type(bci,
2919 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2920 "Method expects a return value");
2921 return;
2922 }
2923 bool match = return_type.is_assignable_from(type, this, false, CHECK_VERIFY(this));
2924 if (!match) {
2925 verify_error(ErrorContext::bad_type(bci,
2926 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2927 "Bad return type");
2928 return;
2929 }
2930 }
2931
2932 // The verifier creates symbols which are substrings of Symbols.
2933 // These are stored in the verifier until the end of verification so that
2934 // they can be reference counted.
2935 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2936 int end, TRAPS) {
2937 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2938 _symbols->push(sym);
2939 return sym;
2940 }
2941
2942 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2943 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2944 _symbols->push(sym);
2945 return sym;
2946 }