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