1 /*
2 * Copyright (c) 1998, 2013, 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.hpp"
47 #include "runtime/os.hpp"
48 #ifdef TARGET_ARCH_x86
49 # include "bytes_x86.hpp"
50 #endif
51 #ifdef TARGET_ARCH_sparc
52 # include "bytes_sparc.hpp"
53 #endif
54 #ifdef TARGET_ARCH_zero
55 # include "bytes_zero.hpp"
56 #endif
57 #ifdef TARGET_ARCH_arm
58 # include "bytes_arm.hpp"
59 #endif
60 #ifdef TARGET_ARCH_ppc
61 # include "bytes_ppc.hpp"
62 #endif
63
64 #define NOFAILOVER_MAJOR_VERSION 51
65 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
66 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
67
68 // Access to external entry for VerifyClassCodes - old byte code verifier
69
70 extern "C" {
71 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
72 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
73 }
74
75 static void* volatile _verify_byte_codes_fn = NULL;
76
77 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
78
79 static void* verify_byte_codes_fn() {
80 if (_verify_byte_codes_fn == NULL) {
81 void *lib_handle = os::native_java_library();
82 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
83 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
84 if (func == NULL) {
85 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
86 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
87 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
88 }
89 }
90 return (void*)_verify_byte_codes_fn;
91 }
92
93
94 // Methods in Verifier
95
96 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
97 return (class_loader == NULL || !should_verify_class) ?
98 BytecodeVerificationLocal : BytecodeVerificationRemote;
99 }
100
101 bool Verifier::relax_verify_for(oop loader) {
102 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
103 bool need_verify =
104 // verifyAll
105 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
106 // verifyRemote
107 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
108 return !need_verify;
109 }
110
111 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
112 HandleMark hm;
113 ResourceMark rm(THREAD);
114
115 Symbol* exception_name = NULL;
116 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
117 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
118 char* exception_message = message_buffer;
119
120 const char* klassName = klass->external_name();
121 bool can_failover = FailOverToOldVerifier &&
122 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
123
124 // If the class should be verified, first see if we can use the split
125 // verifier. If not, or if verification fails and FailOverToOldVerifier
126 // is set, then call the inference verifier.
127 if (is_eligible_for_verification(klass, should_verify_class)) {
128 if (TraceClassInitialization) {
129 tty->print_cr("Start class verification for: %s", klassName);
130 }
131 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
132 ClassVerifier split_verifier(klass, THREAD);
133 split_verifier.verify_class(THREAD);
134 exception_name = split_verifier.result();
135 if (can_failover && !HAS_PENDING_EXCEPTION &&
136 (exception_name == vmSymbols::java_lang_VerifyError() ||
137 exception_name == vmSymbols::java_lang_ClassFormatError())) {
138 if (TraceClassInitialization || VerboseVerification) {
139 tty->print_cr(
140 "Fail over class verification to old verifier for: %s", klassName);
141 }
142 exception_name = inference_verify(
143 klass, message_buffer, message_buffer_len, THREAD);
144 }
145 if (exception_name != NULL) {
146 exception_message = split_verifier.exception_message();
147 }
148 } else {
149 exception_name = inference_verify(
150 klass, message_buffer, message_buffer_len, THREAD);
151 }
152
153 if (TraceClassInitialization || VerboseVerification) {
154 if (HAS_PENDING_EXCEPTION) {
155 tty->print("Verification for %s has", klassName);
156 tty->print_cr(" exception pending %s ",
157 InstanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
158 } else if (exception_name != NULL) {
159 tty->print_cr("Verification for %s failed", klassName);
160 }
161 tty->print_cr("End class verification for: %s", klassName);
162 }
163 }
164
165 if (HAS_PENDING_EXCEPTION) {
166 return false; // use the existing exception
167 } else if (exception_name == NULL) {
168 return true; // verifcation succeeded
169 } else { // VerifyError or ClassFormatError to be created and thrown
170 ResourceMark rm(THREAD);
171 instanceKlassHandle kls =
172 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
173 while (!kls.is_null()) {
174 if (kls == klass) {
175 // If the class being verified is the exception we're creating
176 // or one of it's superclasses, we're in trouble and are going
177 // to infinitely recurse when we try to initialize the exception.
178 // So bail out here by throwing the preallocated VM error.
179 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
180 }
181 kls = kls->super();
182 }
183 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
184 THROW_MSG_(exception_name, exception_message, false);
185 }
186 }
187
188 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
189 Symbol* name = klass->name();
190 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
191
192 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
193
194 return (should_verify_for(klass->class_loader(), should_verify_class) &&
195 // return if the class is a bootstrapping class
196 // or defineClass specified not to verify by default (flags override passed arg)
197 // We need to skip the following four for bootstraping
198 name != vmSymbols::java_lang_Object() &&
199 name != vmSymbols::java_lang_Class() &&
200 name != vmSymbols::java_lang_String() &&
201 name != vmSymbols::java_lang_Throwable() &&
202
203 // Can not verify the bytecodes for shared classes because they have
204 // already been rewritten to contain constant pool cache indices,
205 // which the verifier can't understand.
206 // Shared classes shouldn't have stackmaps either.
207 !klass()->is_shared() &&
208
209 // As of the fix for 4486457 we disable verification for all of the
210 // dynamically-generated bytecodes associated with the 1.4
211 // reflection implementation, not just those associated with
212 // sun/reflect/SerializationConstructorAccessor.
213 // NOTE: this is called too early in the bootstrapping process to be
214 // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.
215 // Also for lambda generated code, gte jdk8
216 (!is_reflect || VerifyReflectionBytecodes));
217 }
218
219 Symbol* Verifier::inference_verify(
220 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
221 JavaThread* thread = (JavaThread*)THREAD;
222 JNIEnv *env = thread->jni_environment();
223
224 void* verify_func = verify_byte_codes_fn();
225
226 if (verify_func == NULL) {
227 jio_snprintf(message, message_len, "Could not link verifier");
228 return vmSymbols::java_lang_VerifyError();
229 }
230
231 ResourceMark rm(THREAD);
232 if (VerboseVerification) {
233 tty->print_cr("Verifying class %s with old format", klass->external_name());
234 }
235
236 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
237 jint result;
238
239 {
240 HandleMark hm(thread);
241 ThreadToNativeFromVM ttn(thread);
242 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
243 // code knows that we have left the VM
244
245 if (_is_new_verify_byte_codes_fn) {
246 verify_byte_codes_fn_new_t func =
247 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
248 result = (*func)(env, cls, message, (int)message_len,
249 klass->major_version());
250 } else {
251 verify_byte_codes_fn_t func =
252 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
253 result = (*func)(env, cls, message, (int)message_len);
254 }
255 }
256
257 JNIHandles::destroy_local(cls);
258
259 // These numbers are chosen so that VerifyClassCodes interface doesn't need
260 // to be changed (still return jboolean (unsigned char)), and result is
261 // 1 when verification is passed.
262 if (result == 0) {
263 return vmSymbols::java_lang_VerifyError();
264 } else if (result == 1) {
265 return NULL; // verified.
266 } else if (result == 2) {
267 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
268 } else if (result == 3) {
269 return vmSymbols::java_lang_ClassFormatError();
270 } else {
271 ShouldNotReachHere();
272 return NULL;
273 }
274 }
275
276 TypeOrigin TypeOrigin::null() {
277 return TypeOrigin();
278 }
279 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
280 assert(frame != NULL, "Must have a frame");
281 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
282 frame->local_at(index));
283 }
284 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
285 assert(frame != NULL, "Must have a frame");
286 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
287 frame->stack_at(index));
288 }
289 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
290 assert(frame != NULL, "Must have a frame");
291 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
292 frame->local_at(index));
293 }
294 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
295 assert(frame != NULL, "Must have a frame");
296 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
297 frame->stack_at(index));
298 }
299 TypeOrigin TypeOrigin::bad_index(u2 index) {
300 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
301 }
302 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
303 return TypeOrigin(CONST_POOL, index, NULL, vt);
304 }
305 TypeOrigin TypeOrigin::signature(VerificationType vt) {
306 return TypeOrigin(SIG, 0, NULL, vt);
307 }
308 TypeOrigin TypeOrigin::implicit(VerificationType t) {
309 return TypeOrigin(IMPLICIT, 0, NULL, t);
310 }
311 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
312 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
313 VerificationType::bogus_type());
314 }
315
316 void TypeOrigin::reset_frame() {
317 if (_frame != NULL) {
318 _frame->restore();
319 }
320 }
321
322 void TypeOrigin::details(outputStream* ss) const {
323 _type.print_on(ss);
324 switch (_origin) {
325 case CF_LOCALS:
326 ss->print(" (current frame, locals[%d])", _index);
327 break;
328 case CF_STACK:
329 ss->print(" (current frame, stack[%d])", _index);
330 break;
331 case SM_LOCALS:
332 ss->print(" (stack map, locals[%d])", _index);
333 break;
334 case SM_STACK:
335 ss->print(" (stack map, stack[%d])", _index);
336 break;
337 case CONST_POOL:
338 ss->print(" (constant pool %d)", _index);
339 break;
340 case SIG:
341 ss->print(" (from method signature)");
342 break;
343 case IMPLICIT:
344 case FRAME_ONLY:
345 case NONE:
346 default:
347 ;
348 }
349 }
350
351 #ifdef ASSERT
352 void TypeOrigin::print_on(outputStream* str) const {
353 str->print("{%d,%d,%p:", _origin, _index, _frame);
354 if (_frame != NULL) {
355 _frame->print_on(str);
356 } else {
357 str->print("null");
358 }
359 str->print(",");
360 _type.print_on(str);
361 str->print("}");
362 }
363 #endif
364
365 void ErrorContext::details(outputStream* ss, const Method* method) const {
366 if (is_valid()) {
367 ss->print_cr("");
368 ss->print_cr("Exception Details:");
369 location_details(ss, method);
370 reason_details(ss);
371 frame_details(ss);
372 bytecode_details(ss, method);
373 handler_details(ss, method);
374 stackmap_details(ss, method);
375 }
376 }
377
378 void ErrorContext::reason_details(outputStream* ss) const {
379 streamIndentor si(ss);
380 ss->indent().print_cr("Reason:");
381 streamIndentor si2(ss);
382 ss->indent().print("");
383 switch (_fault) {
384 case INVALID_BYTECODE:
385 ss->print("Error exists in the bytecode");
386 break;
387 case WRONG_TYPE:
388 if (_expected.is_valid()) {
389 ss->print("Type ");
390 _type.details(ss);
391 ss->print(" is not assignable to ");
392 _expected.details(ss);
393 } else {
394 ss->print("Invalid type: ");
395 _type.details(ss);
396 }
397 break;
398 case FLAGS_MISMATCH:
399 if (_expected.is_valid()) {
400 ss->print("Current frame's flags are not assignable "
401 "to stack map frame's.");
402 } else {
403 ss->print("Current frame's flags are invalid in this context.");
404 }
405 break;
406 case BAD_CP_INDEX:
407 ss->print("Constant pool index %d is invalid", _type.index());
408 break;
409 case BAD_LOCAL_INDEX:
410 ss->print("Local index %d is invalid", _type.index());
411 break;
412 case LOCALS_SIZE_MISMATCH:
413 ss->print("Current frame's local size doesn't match stackmap.");
414 break;
415 case STACK_SIZE_MISMATCH:
416 ss->print("Current frame's stack size doesn't match stackmap.");
417 break;
418 case STACK_OVERFLOW:
419 ss->print("Exceeded max stack size.");
420 break;
421 case STACK_UNDERFLOW:
422 ss->print("Attempt to pop empty stack.");
423 break;
424 case MISSING_STACKMAP:
425 ss->print("Expected stackmap frame at this location.");
426 break;
427 case BAD_STACKMAP:
428 ss->print("Invalid stackmap specification.");
429 break;
430 case UNKNOWN:
431 default:
432 ShouldNotReachHere();
433 ss->print_cr("Unknown");
434 }
435 ss->print_cr("");
436 }
437
438 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
439 if (_bci != -1 && method != NULL) {
440 streamIndentor si(ss);
441 const char* bytecode_name = "<invalid>";
442 if (method->validate_bci_from_bcx(_bci) != -1) {
443 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
444 if (Bytecodes::is_defined(code)) {
445 bytecode_name = Bytecodes::name(code);
446 } else {
447 bytecode_name = "<illegal>";
448 }
449 }
450 InstanceKlass* ik = method->method_holder();
451 ss->indent().print_cr("Location:");
452 streamIndentor si2(ss);
453 ss->indent().print_cr("%s.%s%s @%d: %s",
454 ik->name()->as_C_string(), method->name()->as_C_string(),
455 method->signature()->as_C_string(), _bci, bytecode_name);
456 }
457 }
458
459 void ErrorContext::frame_details(outputStream* ss) const {
460 streamIndentor si(ss);
461 if (_type.is_valid() && _type.frame() != NULL) {
462 ss->indent().print_cr("Current Frame:");
463 streamIndentor si2(ss);
464 _type.frame()->print_on(ss);
465 }
466 if (_expected.is_valid() && _expected.frame() != NULL) {
467 ss->indent().print_cr("Stackmap Frame:");
468 streamIndentor si2(ss);
469 _expected.frame()->print_on(ss);
470 }
471 }
472
473 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
474 if (method != NULL) {
475 streamIndentor si(ss);
476 ss->indent().print_cr("Bytecode:");
477 streamIndentor si2(ss);
478 ss->print_data(method->code_base(), method->code_size(), false);
479 }
480 }
481
482 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
483 if (method != NULL) {
484 streamIndentor si(ss);
485 ExceptionTable table(method);
486 if (table.length() > 0) {
487 ss->indent().print_cr("Exception Handler Table:");
488 streamIndentor si2(ss);
489 for (int i = 0; i < table.length(); ++i) {
490 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
491 table.end_pc(i), table.handler_pc(i));
492 }
493 }
494 }
495 }
496
497 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
498 if (method != NULL && method->has_stackmap_table()) {
499 streamIndentor si(ss);
500 ss->indent().print_cr("Stackmap Table:");
501 Array<u1>* data = method->stackmap_data();
502 stack_map_table* sm_table =
503 stack_map_table::at((address)data->adr_at(0));
504 stack_map_frame* sm_frame = sm_table->entries();
505 streamIndentor si2(ss);
506 int current_offset = -1;
507 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
508 ss->indent();
509 sm_frame->print_on(ss, current_offset);
510 ss->print_cr("");
511 current_offset += sm_frame->offset_delta();
512 sm_frame = sm_frame->next();
513 }
514 }
515 }
516
517 // Methods in ClassVerifier
518
519 ClassVerifier::ClassVerifier(
520 instanceKlassHandle klass, TRAPS)
521 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
522 _this_type = VerificationType::reference_type(klass->name());
523 // Create list to hold symbols in reference area.
524 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
525 }
526
527 ClassVerifier::~ClassVerifier() {
528 // Decrement the reference count for any symbols created.
529 for (int i = 0; i < _symbols->length(); i++) {
530 Symbol* s = _symbols->at(i);
531 s->decrement_refcount();
532 }
533 }
534
535 VerificationType ClassVerifier::object_type() const {
536 return VerificationType::reference_type(vmSymbols::java_lang_Object());
537 }
538
539 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) {
540 VerificationType vt = VerificationType::reference_type(
541 create_temporary_symbol(sig, (int)strlen(sig), THREAD));
542 return TypeOrigin::implicit(vt);
543 }
544
545 void ClassVerifier::verify_class(TRAPS) {
546 if (VerboseVerification) {
547 tty->print_cr("Verifying class %s with new format",
548 _klass->external_name());
549 }
550
551 Array<Method*>* methods = _klass->methods();
552 int num_methods = methods->length();
553
554 for (int index = 0; index < num_methods; index++) {
555 // Check for recursive re-verification before each method.
556 if (was_recursively_verified()) return;
557
558 Method* m = methods->at(index);
559 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
560 // If m is native or abstract, skip it. It is checked in class file
561 // parser that methods do not override a final method. Overpass methods
562 // are trusted since the VM generates them.
563 continue;
564 }
565 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
566 }
567
568 if (VerboseVerification || TraceClassInitialization) {
569 if (was_recursively_verified())
570 tty->print_cr("Recursive verification detected for: %s",
571 _klass->external_name());
572 }
573 }
574
575 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
576 HandleMark hm(THREAD);
577 _method = m; // initialize _method
578 if (VerboseVerification) {
579 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
580 }
581
582 const char* bad_type_msg = "Bad type on operand stack in %s";
583
584 int32_t max_stack = m->verifier_max_stack();
585 int32_t max_locals = m->max_locals();
586 constantPoolHandle cp(THREAD, m->constants());
587
588 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
589 class_format_error("Invalid method signature");
590 return;
591 }
592
593 // Initial stack map frame: offset is 0, stack is initially empty.
594 StackMapFrame current_frame(max_locals, max_stack, this);
595 // Set initial locals
596 VerificationType return_type = current_frame.set_locals_from_arg(
597 m, current_type(), CHECK_VERIFY(this));
598
599 int32_t stackmap_index = 0; // index to the stackmap array
600
601 u4 code_length = m->code_size();
602
603 // Scan the bytecode and map each instruction's start offset to a number.
604 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
605
606 int ex_min = code_length;
607 int ex_max = -1;
608 // Look through each item on the exception table. Each of the fields must refer
609 // to a legal instruction.
610 verify_exception_handler_table(
611 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
612
613 // Look through each entry on the local variable table and make sure
614 // its range of code array offsets is valid. (4169817)
615 if (m->has_localvariable_table()) {
616 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
617 }
618
619 Array<u1>* stackmap_data = m->stackmap_data();
620 StackMapStream stream(stackmap_data);
621 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
622 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
623 code_data, code_length, CHECK_VERIFY(this));
624
625 if (VerboseVerification) {
626 stackmap_table.print_on(tty);
627 }
628
629 RawBytecodeStream bcs(m);
630
631 // Scan the byte code linearly from the start to the end
632 bool no_control_flow = false; // Set to true when there is no direct control
633 // flow from current instruction to the next
634 // instruction in sequence
635 Bytecodes::Code opcode;
636 while (!bcs.is_last_bytecode()) {
637 // Check for recursive re-verification before each bytecode.
638 if (was_recursively_verified()) return;
639
640 opcode = bcs.raw_next();
641 u2 bci = bcs.bci();
642
643 // Set current frame's offset to bci
644 current_frame.set_offset(bci);
645 current_frame.set_mark();
646
647 // Make sure every offset in stackmap table point to the beginning to
648 // an instruction. Match current_frame to stackmap_table entry with
649 // the same offset if exists.
650 stackmap_index = verify_stackmap_table(
651 stackmap_index, bci, ¤t_frame, &stackmap_table,
652 no_control_flow, CHECK_VERIFY(this));
653
654
655 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
656
657 // Merge with the next instruction
658 {
659 u2 index;
660 int target;
661 VerificationType type, type2;
662 VerificationType atype;
663
664 #ifndef PRODUCT
665 if (VerboseVerification) {
666 current_frame.print_on(tty);
667 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
668 }
669 #endif
670
671 // Make sure wide instruction is in correct format
672 if (bcs.is_wide()) {
673 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
674 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
675 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
676 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
677 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
678 opcode != Bytecodes::_dstore) {
679 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
680 * if we encounter a wide instruction that modifies an invalid
681 * opcode (not one of the ones listed above) */
682 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
683 return;
684 }
685 }
686
687 switch (opcode) {
688 case Bytecodes::_nop :
689 no_control_flow = false; break;
690 case Bytecodes::_aconst_null :
691 current_frame.push_stack(
692 VerificationType::null_type(), CHECK_VERIFY(this));
693 no_control_flow = false; break;
694 case Bytecodes::_iconst_m1 :
695 case Bytecodes::_iconst_0 :
696 case Bytecodes::_iconst_1 :
697 case Bytecodes::_iconst_2 :
698 case Bytecodes::_iconst_3 :
699 case Bytecodes::_iconst_4 :
700 case Bytecodes::_iconst_5 :
701 current_frame.push_stack(
702 VerificationType::integer_type(), CHECK_VERIFY(this));
703 no_control_flow = false; break;
704 case Bytecodes::_lconst_0 :
705 case Bytecodes::_lconst_1 :
706 current_frame.push_stack_2(
707 VerificationType::long_type(),
708 VerificationType::long2_type(), CHECK_VERIFY(this));
709 no_control_flow = false; break;
710 case Bytecodes::_fconst_0 :
711 case Bytecodes::_fconst_1 :
712 case Bytecodes::_fconst_2 :
713 current_frame.push_stack(
714 VerificationType::float_type(), CHECK_VERIFY(this));
715 no_control_flow = false; break;
716 case Bytecodes::_dconst_0 :
717 case Bytecodes::_dconst_1 :
718 current_frame.push_stack_2(
719 VerificationType::double_type(),
720 VerificationType::double2_type(), CHECK_VERIFY(this));
721 no_control_flow = false; break;
722 case Bytecodes::_sipush :
723 case Bytecodes::_bipush :
724 current_frame.push_stack(
725 VerificationType::integer_type(), CHECK_VERIFY(this));
726 no_control_flow = false; break;
727 case Bytecodes::_ldc :
728 verify_ldc(
729 opcode, bcs.get_index_u1(), ¤t_frame,
730 cp, bci, CHECK_VERIFY(this));
731 no_control_flow = false; break;
732 case Bytecodes::_ldc_w :
733 case Bytecodes::_ldc2_w :
734 verify_ldc(
735 opcode, bcs.get_index_u2(), ¤t_frame,
736 cp, bci, CHECK_VERIFY(this));
737 no_control_flow = false; break;
738 case Bytecodes::_iload :
739 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
740 no_control_flow = false; break;
741 case Bytecodes::_iload_0 :
742 case Bytecodes::_iload_1 :
743 case Bytecodes::_iload_2 :
744 case Bytecodes::_iload_3 :
745 index = opcode - Bytecodes::_iload_0;
746 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
747 no_control_flow = false; break;
748 case Bytecodes::_lload :
749 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
750 no_control_flow = false; break;
751 case Bytecodes::_lload_0 :
752 case Bytecodes::_lload_1 :
753 case Bytecodes::_lload_2 :
754 case Bytecodes::_lload_3 :
755 index = opcode - Bytecodes::_lload_0;
756 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
757 no_control_flow = false; break;
758 case Bytecodes::_fload :
759 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
760 no_control_flow = false; break;
761 case Bytecodes::_fload_0 :
762 case Bytecodes::_fload_1 :
763 case Bytecodes::_fload_2 :
764 case Bytecodes::_fload_3 :
765 index = opcode - Bytecodes::_fload_0;
766 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
767 no_control_flow = false; break;
768 case Bytecodes::_dload :
769 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
770 no_control_flow = false; break;
771 case Bytecodes::_dload_0 :
772 case Bytecodes::_dload_1 :
773 case Bytecodes::_dload_2 :
774 case Bytecodes::_dload_3 :
775 index = opcode - Bytecodes::_dload_0;
776 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
777 no_control_flow = false; break;
778 case Bytecodes::_aload :
779 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
780 no_control_flow = false; break;
781 case Bytecodes::_aload_0 :
782 case Bytecodes::_aload_1 :
783 case Bytecodes::_aload_2 :
784 case Bytecodes::_aload_3 :
785 index = opcode - Bytecodes::_aload_0;
786 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
787 no_control_flow = false; break;
788 case Bytecodes::_iaload :
789 type = current_frame.pop_stack(
790 VerificationType::integer_type(), CHECK_VERIFY(this));
791 atype = current_frame.pop_stack(
792 VerificationType::reference_check(), CHECK_VERIFY(this));
793 if (!atype.is_int_array()) {
794 verify_error(ErrorContext::bad_type(bci,
795 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
796 bad_type_msg, "iaload");
797 return;
798 }
799 current_frame.push_stack(
800 VerificationType::integer_type(), CHECK_VERIFY(this));
801 no_control_flow = false; break;
802 case Bytecodes::_baload :
803 type = current_frame.pop_stack(
804 VerificationType::integer_type(), CHECK_VERIFY(this));
805 atype = current_frame.pop_stack(
806 VerificationType::reference_check(), CHECK_VERIFY(this));
807 if (!atype.is_bool_array() && !atype.is_byte_array()) {
808 verify_error(
809 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
810 bad_type_msg, "baload");
811 return;
812 }
813 current_frame.push_stack(
814 VerificationType::integer_type(), CHECK_VERIFY(this));
815 no_control_flow = false; break;
816 case Bytecodes::_caload :
817 type = current_frame.pop_stack(
818 VerificationType::integer_type(), CHECK_VERIFY(this));
819 atype = current_frame.pop_stack(
820 VerificationType::reference_check(), CHECK_VERIFY(this));
821 if (!atype.is_char_array()) {
822 verify_error(ErrorContext::bad_type(bci,
823 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
824 bad_type_msg, "caload");
825 return;
826 }
827 current_frame.push_stack(
828 VerificationType::integer_type(), CHECK_VERIFY(this));
829 no_control_flow = false; break;
830 case Bytecodes::_saload :
831 type = current_frame.pop_stack(
832 VerificationType::integer_type(), CHECK_VERIFY(this));
833 atype = current_frame.pop_stack(
834 VerificationType::reference_check(), CHECK_VERIFY(this));
835 if (!atype.is_short_array()) {
836 verify_error(ErrorContext::bad_type(bci,
837 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
838 bad_type_msg, "saload");
839 return;
840 }
841 current_frame.push_stack(
842 VerificationType::integer_type(), CHECK_VERIFY(this));
843 no_control_flow = false; break;
844 case Bytecodes::_laload :
845 type = current_frame.pop_stack(
846 VerificationType::integer_type(), CHECK_VERIFY(this));
847 atype = current_frame.pop_stack(
848 VerificationType::reference_check(), CHECK_VERIFY(this));
849 if (!atype.is_long_array()) {
850 verify_error(ErrorContext::bad_type(bci,
851 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
852 bad_type_msg, "laload");
853 return;
854 }
855 current_frame.push_stack_2(
856 VerificationType::long_type(),
857 VerificationType::long2_type(), CHECK_VERIFY(this));
858 no_control_flow = false; break;
859 case Bytecodes::_faload :
860 type = current_frame.pop_stack(
861 VerificationType::integer_type(), CHECK_VERIFY(this));
862 atype = current_frame.pop_stack(
863 VerificationType::reference_check(), CHECK_VERIFY(this));
864 if (!atype.is_float_array()) {
865 verify_error(ErrorContext::bad_type(bci,
866 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
867 bad_type_msg, "faload");
868 return;
869 }
870 current_frame.push_stack(
871 VerificationType::float_type(), CHECK_VERIFY(this));
872 no_control_flow = false; break;
873 case Bytecodes::_daload :
874 type = current_frame.pop_stack(
875 VerificationType::integer_type(), CHECK_VERIFY(this));
876 atype = current_frame.pop_stack(
877 VerificationType::reference_check(), CHECK_VERIFY(this));
878 if (!atype.is_double_array()) {
879 verify_error(ErrorContext::bad_type(bci,
880 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
881 bad_type_msg, "daload");
882 return;
883 }
884 current_frame.push_stack_2(
885 VerificationType::double_type(),
886 VerificationType::double2_type(), CHECK_VERIFY(this));
887 no_control_flow = false; break;
888 case Bytecodes::_aaload : {
889 type = current_frame.pop_stack(
890 VerificationType::integer_type(), CHECK_VERIFY(this));
891 atype = current_frame.pop_stack(
892 VerificationType::reference_check(), CHECK_VERIFY(this));
893 if (!atype.is_reference_array()) {
894 verify_error(ErrorContext::bad_type(bci,
895 current_frame.stack_top_ctx(),
896 TypeOrigin::implicit(VerificationType::reference_check())),
897 bad_type_msg, "aaload");
898 return;
899 }
900 if (atype.is_null()) {
901 current_frame.push_stack(
902 VerificationType::null_type(), CHECK_VERIFY(this));
903 } else {
904 VerificationType component =
905 atype.get_component(this, CHECK_VERIFY(this));
906 current_frame.push_stack(component, CHECK_VERIFY(this));
907 }
908 no_control_flow = false; break;
909 }
910 case Bytecodes::_istore :
911 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
912 no_control_flow = false; break;
913 case Bytecodes::_istore_0 :
914 case Bytecodes::_istore_1 :
915 case Bytecodes::_istore_2 :
916 case Bytecodes::_istore_3 :
917 index = opcode - Bytecodes::_istore_0;
918 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
919 no_control_flow = false; break;
920 case Bytecodes::_lstore :
921 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
922 no_control_flow = false; break;
923 case Bytecodes::_lstore_0 :
924 case Bytecodes::_lstore_1 :
925 case Bytecodes::_lstore_2 :
926 case Bytecodes::_lstore_3 :
927 index = opcode - Bytecodes::_lstore_0;
928 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
929 no_control_flow = false; break;
930 case Bytecodes::_fstore :
931 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
932 no_control_flow = false; break;
933 case Bytecodes::_fstore_0 :
934 case Bytecodes::_fstore_1 :
935 case Bytecodes::_fstore_2 :
936 case Bytecodes::_fstore_3 :
937 index = opcode - Bytecodes::_fstore_0;
938 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
939 no_control_flow = false; break;
940 case Bytecodes::_dstore :
941 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
942 no_control_flow = false; break;
943 case Bytecodes::_dstore_0 :
944 case Bytecodes::_dstore_1 :
945 case Bytecodes::_dstore_2 :
946 case Bytecodes::_dstore_3 :
947 index = opcode - Bytecodes::_dstore_0;
948 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
949 no_control_flow = false; break;
950 case Bytecodes::_astore :
951 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
952 no_control_flow = false; break;
953 case Bytecodes::_astore_0 :
954 case Bytecodes::_astore_1 :
955 case Bytecodes::_astore_2 :
956 case Bytecodes::_astore_3 :
957 index = opcode - Bytecodes::_astore_0;
958 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
959 no_control_flow = false; break;
960 case Bytecodes::_iastore :
961 type = current_frame.pop_stack(
962 VerificationType::integer_type(), CHECK_VERIFY(this));
963 type2 = current_frame.pop_stack(
964 VerificationType::integer_type(), CHECK_VERIFY(this));
965 atype = current_frame.pop_stack(
966 VerificationType::reference_check(), CHECK_VERIFY(this));
967 if (!atype.is_int_array()) {
968 verify_error(ErrorContext::bad_type(bci,
969 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
970 bad_type_msg, "iastore");
971 return;
972 }
973 no_control_flow = false; break;
974 case Bytecodes::_bastore :
975 type = current_frame.pop_stack(
976 VerificationType::integer_type(), CHECK_VERIFY(this));
977 type2 = current_frame.pop_stack(
978 VerificationType::integer_type(), CHECK_VERIFY(this));
979 atype = current_frame.pop_stack(
980 VerificationType::reference_check(), CHECK_VERIFY(this));
981 if (!atype.is_bool_array() && !atype.is_byte_array()) {
982 verify_error(
983 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
984 bad_type_msg, "bastore");
985 return;
986 }
987 no_control_flow = false; break;
988 case Bytecodes::_castore :
989 current_frame.pop_stack(
990 VerificationType::integer_type(), CHECK_VERIFY(this));
991 current_frame.pop_stack(
992 VerificationType::integer_type(), CHECK_VERIFY(this));
993 atype = current_frame.pop_stack(
994 VerificationType::reference_check(), CHECK_VERIFY(this));
995 if (!atype.is_char_array()) {
996 verify_error(ErrorContext::bad_type(bci,
997 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
998 bad_type_msg, "castore");
999 return;
1000 }
1001 no_control_flow = false; break;
1002 case Bytecodes::_sastore :
1003 current_frame.pop_stack(
1004 VerificationType::integer_type(), CHECK_VERIFY(this));
1005 current_frame.pop_stack(
1006 VerificationType::integer_type(), CHECK_VERIFY(this));
1007 atype = current_frame.pop_stack(
1008 VerificationType::reference_check(), CHECK_VERIFY(this));
1009 if (!atype.is_short_array()) {
1010 verify_error(ErrorContext::bad_type(bci,
1011 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1012 bad_type_msg, "sastore");
1013 return;
1014 }
1015 no_control_flow = false; break;
1016 case Bytecodes::_lastore :
1017 current_frame.pop_stack_2(
1018 VerificationType::long2_type(),
1019 VerificationType::long_type(), CHECK_VERIFY(this));
1020 current_frame.pop_stack(
1021 VerificationType::integer_type(), CHECK_VERIFY(this));
1022 atype = current_frame.pop_stack(
1023 VerificationType::reference_check(), CHECK_VERIFY(this));
1024 if (!atype.is_long_array()) {
1025 verify_error(ErrorContext::bad_type(bci,
1026 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1027 bad_type_msg, "lastore");
1028 return;
1029 }
1030 no_control_flow = false; break;
1031 case Bytecodes::_fastore :
1032 current_frame.pop_stack(
1033 VerificationType::float_type(), CHECK_VERIFY(this));
1034 current_frame.pop_stack
1035 (VerificationType::integer_type(), CHECK_VERIFY(this));
1036 atype = current_frame.pop_stack(
1037 VerificationType::reference_check(), CHECK_VERIFY(this));
1038 if (!atype.is_float_array()) {
1039 verify_error(ErrorContext::bad_type(bci,
1040 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1041 bad_type_msg, "fastore");
1042 return;
1043 }
1044 no_control_flow = false; break;
1045 case Bytecodes::_dastore :
1046 current_frame.pop_stack_2(
1047 VerificationType::double2_type(),
1048 VerificationType::double_type(), CHECK_VERIFY(this));
1049 current_frame.pop_stack(
1050 VerificationType::integer_type(), CHECK_VERIFY(this));
1051 atype = current_frame.pop_stack(
1052 VerificationType::reference_check(), CHECK_VERIFY(this));
1053 if (!atype.is_double_array()) {
1054 verify_error(ErrorContext::bad_type(bci,
1055 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1056 bad_type_msg, "dastore");
1057 return;
1058 }
1059 no_control_flow = false; break;
1060 case Bytecodes::_aastore :
1061 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1062 type2 = current_frame.pop_stack(
1063 VerificationType::integer_type(), CHECK_VERIFY(this));
1064 atype = current_frame.pop_stack(
1065 VerificationType::reference_check(), CHECK_VERIFY(this));
1066 // more type-checking is done at runtime
1067 if (!atype.is_reference_array()) {
1068 verify_error(ErrorContext::bad_type(bci,
1069 current_frame.stack_top_ctx(),
1070 TypeOrigin::implicit(VerificationType::reference_check())),
1071 bad_type_msg, "aastore");
1072 return;
1073 }
1074 // 4938384: relaxed constraint in JVMS 3nd edition.
1075 no_control_flow = false; break;
1076 case Bytecodes::_pop :
1077 current_frame.pop_stack(
1078 VerificationType::category1_check(), CHECK_VERIFY(this));
1079 no_control_flow = false; break;
1080 case Bytecodes::_pop2 :
1081 type = current_frame.pop_stack(CHECK_VERIFY(this));
1082 if (type.is_category1()) {
1083 current_frame.pop_stack(
1084 VerificationType::category1_check(), CHECK_VERIFY(this));
1085 } else if (type.is_category2_2nd()) {
1086 current_frame.pop_stack(
1087 VerificationType::category2_check(), CHECK_VERIFY(this));
1088 } else {
1089 /* Unreachable? Would need a category2_1st on TOS
1090 * which does not appear possible. */
1091 verify_error(
1092 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1093 bad_type_msg, "pop2");
1094 return;
1095 }
1096 no_control_flow = false; break;
1097 case Bytecodes::_dup :
1098 type = current_frame.pop_stack(
1099 VerificationType::category1_check(), CHECK_VERIFY(this));
1100 current_frame.push_stack(type, CHECK_VERIFY(this));
1101 current_frame.push_stack(type, CHECK_VERIFY(this));
1102 no_control_flow = false; break;
1103 case Bytecodes::_dup_x1 :
1104 type = current_frame.pop_stack(
1105 VerificationType::category1_check(), CHECK_VERIFY(this));
1106 type2 = current_frame.pop_stack(
1107 VerificationType::category1_check(), CHECK_VERIFY(this));
1108 current_frame.push_stack(type, CHECK_VERIFY(this));
1109 current_frame.push_stack(type2, CHECK_VERIFY(this));
1110 current_frame.push_stack(type, CHECK_VERIFY(this));
1111 no_control_flow = false; break;
1112 case Bytecodes::_dup_x2 :
1113 {
1114 VerificationType type3;
1115 type = current_frame.pop_stack(
1116 VerificationType::category1_check(), CHECK_VERIFY(this));
1117 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1118 if (type2.is_category1()) {
1119 type3 = current_frame.pop_stack(
1120 VerificationType::category1_check(), CHECK_VERIFY(this));
1121 } else if (type2.is_category2_2nd()) {
1122 type3 = current_frame.pop_stack(
1123 VerificationType::category2_check(), CHECK_VERIFY(this));
1124 } else {
1125 /* Unreachable? Would need a category2_1st at stack depth 2 with
1126 * a category1 on TOS which does not appear possible. */
1127 verify_error(ErrorContext::bad_type(
1128 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1129 return;
1130 }
1131 current_frame.push_stack(type, CHECK_VERIFY(this));
1132 current_frame.push_stack(type3, CHECK_VERIFY(this));
1133 current_frame.push_stack(type2, CHECK_VERIFY(this));
1134 current_frame.push_stack(type, CHECK_VERIFY(this));
1135 no_control_flow = false; break;
1136 }
1137 case Bytecodes::_dup2 :
1138 type = current_frame.pop_stack(CHECK_VERIFY(this));
1139 if (type.is_category1()) {
1140 type2 = current_frame.pop_stack(
1141 VerificationType::category1_check(), CHECK_VERIFY(this));
1142 } else if (type.is_category2_2nd()) {
1143 type2 = current_frame.pop_stack(
1144 VerificationType::category2_check(), CHECK_VERIFY(this));
1145 } else {
1146 /* Unreachable? Would need a category2_1st on TOS which does not
1147 * appear possible. */
1148 verify_error(
1149 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1150 bad_type_msg, "dup2");
1151 return;
1152 }
1153 current_frame.push_stack(type2, CHECK_VERIFY(this));
1154 current_frame.push_stack(type, CHECK_VERIFY(this));
1155 current_frame.push_stack(type2, CHECK_VERIFY(this));
1156 current_frame.push_stack(type, CHECK_VERIFY(this));
1157 no_control_flow = false; break;
1158 case Bytecodes::_dup2_x1 :
1159 {
1160 VerificationType type3;
1161 type = current_frame.pop_stack(CHECK_VERIFY(this));
1162 if (type.is_category1()) {
1163 type2 = current_frame.pop_stack(
1164 VerificationType::category1_check(), CHECK_VERIFY(this));
1165 } else if (type.is_category2_2nd()) {
1166 type2 = current_frame.pop_stack(
1167 VerificationType::category2_check(), CHECK_VERIFY(this));
1168 } else {
1169 /* Unreachable? Would need a category2_1st on TOS which does
1170 * not appear possible. */
1171 verify_error(
1172 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1173 bad_type_msg, "dup2_x1");
1174 return;
1175 }
1176 type3 = current_frame.pop_stack(
1177 VerificationType::category1_check(), CHECK_VERIFY(this));
1178 current_frame.push_stack(type2, CHECK_VERIFY(this));
1179 current_frame.push_stack(type, CHECK_VERIFY(this));
1180 current_frame.push_stack(type3, CHECK_VERIFY(this));
1181 current_frame.push_stack(type2, CHECK_VERIFY(this));
1182 current_frame.push_stack(type, CHECK_VERIFY(this));
1183 no_control_flow = false; break;
1184 }
1185 case Bytecodes::_dup2_x2 :
1186 {
1187 VerificationType type3, type4;
1188 type = current_frame.pop_stack(CHECK_VERIFY(this));
1189 if (type.is_category1()) {
1190 type2 = current_frame.pop_stack(
1191 VerificationType::category1_check(), CHECK_VERIFY(this));
1192 } else if (type.is_category2_2nd()) {
1193 type2 = current_frame.pop_stack(
1194 VerificationType::category2_check(), CHECK_VERIFY(this));
1195 } else {
1196 /* Unreachable? Would need a category2_1st on TOS which does
1197 * not appear possible. */
1198 verify_error(
1199 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1200 bad_type_msg, "dup2_x2");
1201 return;
1202 }
1203 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1204 if (type3.is_category1()) {
1205 type4 = current_frame.pop_stack(
1206 VerificationType::category1_check(), CHECK_VERIFY(this));
1207 } else if (type3.is_category2_2nd()) {
1208 type4 = current_frame.pop_stack(
1209 VerificationType::category2_check(), CHECK_VERIFY(this));
1210 } else {
1211 /* Unreachable? Would need a category2_1st on TOS after popping
1212 * a long/double or two category 1's, which does not
1213 * appear possible. */
1214 verify_error(
1215 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1216 bad_type_msg, "dup2_x2");
1217 return;
1218 }
1219 current_frame.push_stack(type2, CHECK_VERIFY(this));
1220 current_frame.push_stack(type, CHECK_VERIFY(this));
1221 current_frame.push_stack(type4, CHECK_VERIFY(this));
1222 current_frame.push_stack(type3, CHECK_VERIFY(this));
1223 current_frame.push_stack(type2, CHECK_VERIFY(this));
1224 current_frame.push_stack(type, CHECK_VERIFY(this));
1225 no_control_flow = false; break;
1226 }
1227 case Bytecodes::_swap :
1228 type = current_frame.pop_stack(
1229 VerificationType::category1_check(), CHECK_VERIFY(this));
1230 type2 = current_frame.pop_stack(
1231 VerificationType::category1_check(), CHECK_VERIFY(this));
1232 current_frame.push_stack(type, CHECK_VERIFY(this));
1233 current_frame.push_stack(type2, CHECK_VERIFY(this));
1234 no_control_flow = false; break;
1235 case Bytecodes::_iadd :
1236 case Bytecodes::_isub :
1237 case Bytecodes::_imul :
1238 case Bytecodes::_idiv :
1239 case Bytecodes::_irem :
1240 case Bytecodes::_ishl :
1241 case Bytecodes::_ishr :
1242 case Bytecodes::_iushr :
1243 case Bytecodes::_ior :
1244 case Bytecodes::_ixor :
1245 case Bytecodes::_iand :
1246 current_frame.pop_stack(
1247 VerificationType::integer_type(), CHECK_VERIFY(this));
1248 // fall through
1249 case Bytecodes::_ineg :
1250 current_frame.pop_stack(
1251 VerificationType::integer_type(), CHECK_VERIFY(this));
1252 current_frame.push_stack(
1253 VerificationType::integer_type(), CHECK_VERIFY(this));
1254 no_control_flow = false; break;
1255 case Bytecodes::_ladd :
1256 case Bytecodes::_lsub :
1257 case Bytecodes::_lmul :
1258 case Bytecodes::_ldiv :
1259 case Bytecodes::_lrem :
1260 case Bytecodes::_land :
1261 case Bytecodes::_lor :
1262 case Bytecodes::_lxor :
1263 current_frame.pop_stack_2(
1264 VerificationType::long2_type(),
1265 VerificationType::long_type(), CHECK_VERIFY(this));
1266 // fall through
1267 case Bytecodes::_lneg :
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::_lshl :
1276 case Bytecodes::_lshr :
1277 case Bytecodes::_lushr :
1278 current_frame.pop_stack(
1279 VerificationType::integer_type(), CHECK_VERIFY(this));
1280 current_frame.pop_stack_2(
1281 VerificationType::long2_type(),
1282 VerificationType::long_type(), CHECK_VERIFY(this));
1283 current_frame.push_stack_2(
1284 VerificationType::long_type(),
1285 VerificationType::long2_type(), CHECK_VERIFY(this));
1286 no_control_flow = false; break;
1287 case Bytecodes::_fadd :
1288 case Bytecodes::_fsub :
1289 case Bytecodes::_fmul :
1290 case Bytecodes::_fdiv :
1291 case Bytecodes::_frem :
1292 current_frame.pop_stack(
1293 VerificationType::float_type(), CHECK_VERIFY(this));
1294 // fall through
1295 case Bytecodes::_fneg :
1296 current_frame.pop_stack(
1297 VerificationType::float_type(), CHECK_VERIFY(this));
1298 current_frame.push_stack(
1299 VerificationType::float_type(), CHECK_VERIFY(this));
1300 no_control_flow = false; break;
1301 case Bytecodes::_dadd :
1302 case Bytecodes::_dsub :
1303 case Bytecodes::_dmul :
1304 case Bytecodes::_ddiv :
1305 case Bytecodes::_drem :
1306 current_frame.pop_stack_2(
1307 VerificationType::double2_type(),
1308 VerificationType::double_type(), CHECK_VERIFY(this));
1309 // fall through
1310 case Bytecodes::_dneg :
1311 current_frame.pop_stack_2(
1312 VerificationType::double2_type(),
1313 VerificationType::double_type(), CHECK_VERIFY(this));
1314 current_frame.push_stack_2(
1315 VerificationType::double_type(),
1316 VerificationType::double2_type(), CHECK_VERIFY(this));
1317 no_control_flow = false; break;
1318 case Bytecodes::_iinc :
1319 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1320 no_control_flow = false; break;
1321 case Bytecodes::_i2l :
1322 type = current_frame.pop_stack(
1323 VerificationType::integer_type(), CHECK_VERIFY(this));
1324 current_frame.push_stack_2(
1325 VerificationType::long_type(),
1326 VerificationType::long2_type(), CHECK_VERIFY(this));
1327 no_control_flow = false; break;
1328 case Bytecodes::_l2i :
1329 current_frame.pop_stack_2(
1330 VerificationType::long2_type(),
1331 VerificationType::long_type(), CHECK_VERIFY(this));
1332 current_frame.push_stack(
1333 VerificationType::integer_type(), CHECK_VERIFY(this));
1334 no_control_flow = false; break;
1335 case Bytecodes::_i2f :
1336 current_frame.pop_stack(
1337 VerificationType::integer_type(), CHECK_VERIFY(this));
1338 current_frame.push_stack(
1339 VerificationType::float_type(), CHECK_VERIFY(this));
1340 no_control_flow = false; break;
1341 case Bytecodes::_i2d :
1342 current_frame.pop_stack(
1343 VerificationType::integer_type(), CHECK_VERIFY(this));
1344 current_frame.push_stack_2(
1345 VerificationType::double_type(),
1346 VerificationType::double2_type(), CHECK_VERIFY(this));
1347 no_control_flow = false; break;
1348 case Bytecodes::_l2f :
1349 current_frame.pop_stack_2(
1350 VerificationType::long2_type(),
1351 VerificationType::long_type(), CHECK_VERIFY(this));
1352 current_frame.push_stack(
1353 VerificationType::float_type(), CHECK_VERIFY(this));
1354 no_control_flow = false; break;
1355 case Bytecodes::_l2d :
1356 current_frame.pop_stack_2(
1357 VerificationType::long2_type(),
1358 VerificationType::long_type(), CHECK_VERIFY(this));
1359 current_frame.push_stack_2(
1360 VerificationType::double_type(),
1361 VerificationType::double2_type(), CHECK_VERIFY(this));
1362 no_control_flow = false; break;
1363 case Bytecodes::_f2i :
1364 current_frame.pop_stack(
1365 VerificationType::float_type(), CHECK_VERIFY(this));
1366 current_frame.push_stack(
1367 VerificationType::integer_type(), CHECK_VERIFY(this));
1368 no_control_flow = false; break;
1369 case Bytecodes::_f2l :
1370 current_frame.pop_stack(
1371 VerificationType::float_type(), CHECK_VERIFY(this));
1372 current_frame.push_stack_2(
1373 VerificationType::long_type(),
1374 VerificationType::long2_type(), CHECK_VERIFY(this));
1375 no_control_flow = false; break;
1376 case Bytecodes::_f2d :
1377 current_frame.pop_stack(
1378 VerificationType::float_type(), CHECK_VERIFY(this));
1379 current_frame.push_stack_2(
1380 VerificationType::double_type(),
1381 VerificationType::double2_type(), CHECK_VERIFY(this));
1382 no_control_flow = false; break;
1383 case Bytecodes::_d2i :
1384 current_frame.pop_stack_2(
1385 VerificationType::double2_type(),
1386 VerificationType::double_type(), CHECK_VERIFY(this));
1387 current_frame.push_stack(
1388 VerificationType::integer_type(), CHECK_VERIFY(this));
1389 no_control_flow = false; break;
1390 case Bytecodes::_d2l :
1391 current_frame.pop_stack_2(
1392 VerificationType::double2_type(),
1393 VerificationType::double_type(), CHECK_VERIFY(this));
1394 current_frame.push_stack_2(
1395 VerificationType::long_type(),
1396 VerificationType::long2_type(), CHECK_VERIFY(this));
1397 no_control_flow = false; break;
1398 case Bytecodes::_d2f :
1399 current_frame.pop_stack_2(
1400 VerificationType::double2_type(),
1401 VerificationType::double_type(), CHECK_VERIFY(this));
1402 current_frame.push_stack(
1403 VerificationType::float_type(), CHECK_VERIFY(this));
1404 no_control_flow = false; break;
1405 case Bytecodes::_i2b :
1406 case Bytecodes::_i2c :
1407 case Bytecodes::_i2s :
1408 current_frame.pop_stack(
1409 VerificationType::integer_type(), CHECK_VERIFY(this));
1410 current_frame.push_stack(
1411 VerificationType::integer_type(), CHECK_VERIFY(this));
1412 no_control_flow = false; break;
1413 case Bytecodes::_lcmp :
1414 current_frame.pop_stack_2(
1415 VerificationType::long2_type(),
1416 VerificationType::long_type(), CHECK_VERIFY(this));
1417 current_frame.pop_stack_2(
1418 VerificationType::long2_type(),
1419 VerificationType::long_type(), CHECK_VERIFY(this));
1420 current_frame.push_stack(
1421 VerificationType::integer_type(), CHECK_VERIFY(this));
1422 no_control_flow = false; break;
1423 case Bytecodes::_fcmpl :
1424 case Bytecodes::_fcmpg :
1425 current_frame.pop_stack(
1426 VerificationType::float_type(), CHECK_VERIFY(this));
1427 current_frame.pop_stack(
1428 VerificationType::float_type(), CHECK_VERIFY(this));
1429 current_frame.push_stack(
1430 VerificationType::integer_type(), CHECK_VERIFY(this));
1431 no_control_flow = false; break;
1432 case Bytecodes::_dcmpl :
1433 case Bytecodes::_dcmpg :
1434 current_frame.pop_stack_2(
1435 VerificationType::double2_type(),
1436 VerificationType::double_type(), CHECK_VERIFY(this));
1437 current_frame.pop_stack_2(
1438 VerificationType::double2_type(),
1439 VerificationType::double_type(), CHECK_VERIFY(this));
1440 current_frame.push_stack(
1441 VerificationType::integer_type(), CHECK_VERIFY(this));
1442 no_control_flow = false; break;
1443 case Bytecodes::_if_icmpeq:
1444 case Bytecodes::_if_icmpne:
1445 case Bytecodes::_if_icmplt:
1446 case Bytecodes::_if_icmpge:
1447 case Bytecodes::_if_icmpgt:
1448 case Bytecodes::_if_icmple:
1449 current_frame.pop_stack(
1450 VerificationType::integer_type(), CHECK_VERIFY(this));
1451 // fall through
1452 case Bytecodes::_ifeq:
1453 case Bytecodes::_ifne:
1454 case Bytecodes::_iflt:
1455 case Bytecodes::_ifge:
1456 case Bytecodes::_ifgt:
1457 case Bytecodes::_ifle:
1458 current_frame.pop_stack(
1459 VerificationType::integer_type(), CHECK_VERIFY(this));
1460 target = bcs.dest();
1461 stackmap_table.check_jump_target(
1462 ¤t_frame, target, CHECK_VERIFY(this));
1463 no_control_flow = false; break;
1464 case Bytecodes::_if_acmpeq :
1465 case Bytecodes::_if_acmpne :
1466 current_frame.pop_stack(
1467 VerificationType::reference_check(), CHECK_VERIFY(this));
1468 // fall through
1469 case Bytecodes::_ifnull :
1470 case Bytecodes::_ifnonnull :
1471 current_frame.pop_stack(
1472 VerificationType::reference_check(), CHECK_VERIFY(this));
1473 target = bcs.dest();
1474 stackmap_table.check_jump_target
1475 (¤t_frame, target, CHECK_VERIFY(this));
1476 no_control_flow = false; break;
1477 case Bytecodes::_goto :
1478 target = bcs.dest();
1479 stackmap_table.check_jump_target(
1480 ¤t_frame, target, CHECK_VERIFY(this));
1481 no_control_flow = true; break;
1482 case Bytecodes::_goto_w :
1483 target = bcs.dest_w();
1484 stackmap_table.check_jump_target(
1485 ¤t_frame, target, CHECK_VERIFY(this));
1486 no_control_flow = true; break;
1487 case Bytecodes::_tableswitch :
1488 case Bytecodes::_lookupswitch :
1489 verify_switch(
1490 &bcs, code_length, code_data, ¤t_frame,
1491 &stackmap_table, CHECK_VERIFY(this));
1492 no_control_flow = true; break;
1493 case Bytecodes::_ireturn :
1494 type = current_frame.pop_stack(
1495 VerificationType::integer_type(), CHECK_VERIFY(this));
1496 verify_return_value(return_type, type, bci,
1497 ¤t_frame, CHECK_VERIFY(this));
1498 no_control_flow = true; break;
1499 case Bytecodes::_lreturn :
1500 type2 = current_frame.pop_stack(
1501 VerificationType::long2_type(), CHECK_VERIFY(this));
1502 type = current_frame.pop_stack(
1503 VerificationType::long_type(), CHECK_VERIFY(this));
1504 verify_return_value(return_type, type, bci,
1505 ¤t_frame, CHECK_VERIFY(this));
1506 no_control_flow = true; break;
1507 case Bytecodes::_freturn :
1508 type = current_frame.pop_stack(
1509 VerificationType::float_type(), CHECK_VERIFY(this));
1510 verify_return_value(return_type, type, bci,
1511 ¤t_frame, CHECK_VERIFY(this));
1512 no_control_flow = true; break;
1513 case Bytecodes::_dreturn :
1514 type2 = current_frame.pop_stack(
1515 VerificationType::double2_type(), CHECK_VERIFY(this));
1516 type = current_frame.pop_stack(
1517 VerificationType::double_type(), CHECK_VERIFY(this));
1518 verify_return_value(return_type, type, bci,
1519 ¤t_frame, CHECK_VERIFY(this));
1520 no_control_flow = true; break;
1521 case Bytecodes::_areturn :
1522 type = current_frame.pop_stack(
1523 VerificationType::reference_check(), CHECK_VERIFY(this));
1524 verify_return_value(return_type, type, bci,
1525 ¤t_frame, CHECK_VERIFY(this));
1526 no_control_flow = true; break;
1527 case Bytecodes::_return :
1528 if (return_type != VerificationType::bogus_type()) {
1529 verify_error(ErrorContext::bad_code(bci),
1530 "Method expects a return value");
1531 return;
1532 }
1533 // Make sure "this" has been initialized if current method is an
1534 // <init>
1535 if (_method->name() == vmSymbols::object_initializer_name() &&
1536 current_frame.flag_this_uninit()) {
1537 verify_error(ErrorContext::bad_code(bci),
1538 "Constructor must call super() or this() "
1539 "before return");
1540 return;
1541 }
1542 no_control_flow = true; break;
1543 case Bytecodes::_getstatic :
1544 case Bytecodes::_putstatic :
1545 case Bytecodes::_getfield :
1546 case Bytecodes::_putfield :
1547 verify_field_instructions(
1548 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1549 no_control_flow = false; break;
1550 case Bytecodes::_invokevirtual :
1551 case Bytecodes::_invokespecial :
1552 case Bytecodes::_invokestatic :
1553 verify_invoke_instructions(
1554 &bcs, code_length, ¤t_frame,
1555 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1556 no_control_flow = false; break;
1557 case Bytecodes::_invokeinterface :
1558 case Bytecodes::_invokedynamic :
1559 verify_invoke_instructions(
1560 &bcs, code_length, ¤t_frame,
1561 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1562 no_control_flow = false; break;
1563 case Bytecodes::_new :
1564 {
1565 index = bcs.get_index_u2();
1566 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1567 VerificationType new_class_type =
1568 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1569 if (!new_class_type.is_object()) {
1570 verify_error(ErrorContext::bad_type(bci,
1571 TypeOrigin::cp(index, new_class_type)),
1572 "Illegal new instruction");
1573 return;
1574 }
1575 type = VerificationType::uninitialized_type(bci);
1576 current_frame.push_stack(type, CHECK_VERIFY(this));
1577 no_control_flow = false; break;
1578 }
1579 case Bytecodes::_newarray :
1580 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1581 current_frame.pop_stack(
1582 VerificationType::integer_type(), CHECK_VERIFY(this));
1583 current_frame.push_stack(type, CHECK_VERIFY(this));
1584 no_control_flow = false; break;
1585 case Bytecodes::_anewarray :
1586 verify_anewarray(
1587 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1588 no_control_flow = false; break;
1589 case Bytecodes::_arraylength :
1590 type = current_frame.pop_stack(
1591 VerificationType::reference_check(), CHECK_VERIFY(this));
1592 if (!(type.is_null() || type.is_array())) {
1593 verify_error(ErrorContext::bad_type(
1594 bci, current_frame.stack_top_ctx()),
1595 bad_type_msg, "arraylength");
1596 }
1597 current_frame.push_stack(
1598 VerificationType::integer_type(), CHECK_VERIFY(this));
1599 no_control_flow = false; break;
1600 case Bytecodes::_checkcast :
1601 {
1602 index = bcs.get_index_u2();
1603 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1604 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1605 VerificationType klass_type = cp_index_to_type(
1606 index, cp, CHECK_VERIFY(this));
1607 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1608 no_control_flow = false; break;
1609 }
1610 case Bytecodes::_instanceof : {
1611 index = bcs.get_index_u2();
1612 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1613 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1614 current_frame.push_stack(
1615 VerificationType::integer_type(), CHECK_VERIFY(this));
1616 no_control_flow = false; break;
1617 }
1618 case Bytecodes::_monitorenter :
1619 case Bytecodes::_monitorexit :
1620 current_frame.pop_stack(
1621 VerificationType::reference_check(), CHECK_VERIFY(this));
1622 no_control_flow = false; break;
1623 case Bytecodes::_multianewarray :
1624 {
1625 index = bcs.get_index_u2();
1626 u2 dim = *(bcs.bcp()+3);
1627 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1628 VerificationType new_array_type =
1629 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1630 if (!new_array_type.is_array()) {
1631 verify_error(ErrorContext::bad_type(bci,
1632 TypeOrigin::cp(index, new_array_type)),
1633 "Illegal constant pool index in multianewarray instruction");
1634 return;
1635 }
1636 if (dim < 1 || new_array_type.dimensions() < dim) {
1637 verify_error(ErrorContext::bad_code(bci),
1638 "Illegal dimension in multianewarray instruction: %d", dim);
1639 return;
1640 }
1641 for (int i = 0; i < dim; i++) {
1642 current_frame.pop_stack(
1643 VerificationType::integer_type(), CHECK_VERIFY(this));
1644 }
1645 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1646 no_control_flow = false; break;
1647 }
1648 case Bytecodes::_athrow :
1649 type = VerificationType::reference_type(
1650 vmSymbols::java_lang_Throwable());
1651 current_frame.pop_stack(type, CHECK_VERIFY(this));
1652 no_control_flow = true; break;
1653 default:
1654 // We only need to check the valid bytecodes in class file.
1655 // And jsr and ret are not in the new class file format in JDK1.5.
1656 verify_error(ErrorContext::bad_code(bci),
1657 "Bad instruction: %02x", opcode);
1658 no_control_flow = false;
1659 return;
1660 } // end switch
1661 } // end Merge with the next instruction
1662
1663 // Look for possible jump target in exception handlers and see if it
1664 // matches current_frame
1665 if (bci >= ex_min && bci < ex_max) {
1666 verify_exception_handler_targets(
1667 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1668 }
1669 } // end while
1670
1671 // Make sure that control flow does not fall through end of the method
1672 if (!no_control_flow) {
1673 verify_error(ErrorContext::bad_code(code_length),
1674 "Control flow falls through code end");
1675 return;
1676 }
1677 }
1678
1679 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1680 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1681 memset(code_data, 0, sizeof(char) * code_length);
1682 RawBytecodeStream bcs(m);
1683
1684 while (!bcs.is_last_bytecode()) {
1685 if (bcs.raw_next() != Bytecodes::_illegal) {
1686 int bci = bcs.bci();
1687 if (bcs.raw_code() == Bytecodes::_new) {
1688 code_data[bci] = NEW_OFFSET;
1689 } else {
1690 code_data[bci] = BYTECODE_OFFSET;
1691 }
1692 } else {
1693 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1694 return NULL;
1695 }
1696 }
1697
1698 return code_data;
1699 }
1700
1701 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1702 ExceptionTable exhandlers(_method());
1703 int exlength = exhandlers.length();
1704 constantPoolHandle cp (THREAD, _method->constants());
1705
1706 for(int i = 0; i < exlength; i++) {
1707 //reacquire the table in case a GC happened
1708 ExceptionTable exhandlers(_method());
1709 u2 start_pc = exhandlers.start_pc(i);
1710 u2 end_pc = exhandlers.end_pc(i);
1711 u2 handler_pc = exhandlers.handler_pc(i);
1712 if (start_pc >= code_length || code_data[start_pc] == 0) {
1713 class_format_error("Illegal exception table start_pc %d", start_pc);
1714 return;
1715 }
1716 if (end_pc != code_length) { // special case: end_pc == code_length
1717 if (end_pc > code_length || code_data[end_pc] == 0) {
1718 class_format_error("Illegal exception table end_pc %d", end_pc);
1719 return;
1720 }
1721 }
1722 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1723 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1724 return;
1725 }
1726 int catch_type_index = exhandlers.catch_type_index(i);
1727 if (catch_type_index != 0) {
1728 VerificationType catch_type = cp_index_to_type(
1729 catch_type_index, cp, CHECK_VERIFY(this));
1730 VerificationType throwable =
1731 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1732 bool is_subclass = throwable.is_assignable_from(
1733 catch_type, this, CHECK_VERIFY(this));
1734 if (!is_subclass) {
1735 // 4286534: should throw VerifyError according to recent spec change
1736 verify_error(ErrorContext::bad_type(handler_pc,
1737 TypeOrigin::cp(catch_type_index, catch_type),
1738 TypeOrigin::implicit(throwable)),
1739 "Catch type is not a subclass "
1740 "of Throwable in exception handler %d", handler_pc);
1741 return;
1742 }
1743 }
1744 if (start_pc < min) min = start_pc;
1745 if (end_pc > max) max = end_pc;
1746 }
1747 }
1748
1749 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1750 int localvariable_table_length = _method()->localvariable_table_length();
1751 if (localvariable_table_length > 0) {
1752 LocalVariableTableElement* table = _method()->localvariable_table_start();
1753 for (int i = 0; i < localvariable_table_length; i++) {
1754 u2 start_bci = table[i].start_bci;
1755 u2 length = table[i].length;
1756
1757 if (start_bci >= code_length || code_data[start_bci] == 0) {
1758 class_format_error(
1759 "Illegal local variable table start_pc %d", start_bci);
1760 return;
1761 }
1762 u4 end_bci = (u4)(start_bci + length);
1763 if (end_bci != code_length) {
1764 if (end_bci >= code_length || code_data[end_bci] == 0) {
1765 class_format_error( "Illegal local variable table length %d", length);
1766 return;
1767 }
1768 }
1769 }
1770 }
1771 }
1772
1773 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1774 StackMapFrame* current_frame,
1775 StackMapTable* stackmap_table,
1776 bool no_control_flow, TRAPS) {
1777 if (stackmap_index < stackmap_table->get_frame_count()) {
1778 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1779 if (no_control_flow && this_offset > bci) {
1780 verify_error(ErrorContext::missing_stackmap(bci),
1781 "Expecting a stack map frame");
1782 return 0;
1783 }
1784 if (this_offset == bci) {
1785 ErrorContext ctx;
1786 // See if current stack map can be assigned to the frame in table.
1787 // current_frame is the stackmap frame got from the last instruction.
1788 // If matched, current_frame will be updated by this method.
1789 bool matches = stackmap_table->match_stackmap(
1790 current_frame, this_offset, stackmap_index,
1791 !no_control_flow, true, &ctx, CHECK_VERIFY_(this, 0));
1792 if (!matches) {
1793 // report type error
1794 verify_error(ctx, "Instruction type does not match stack map");
1795 return 0;
1796 }
1797 stackmap_index++;
1798 } else if (this_offset < bci) {
1799 // current_offset should have met this_offset.
1800 class_format_error("Bad stack map offset %d", this_offset);
1801 return 0;
1802 }
1803 } else if (no_control_flow) {
1804 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1805 return 0;
1806 }
1807 return stackmap_index;
1808 }
1809
1810 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1811 StackMapTable* stackmap_table, TRAPS) {
1812 constantPoolHandle cp (THREAD, _method->constants());
1813 ExceptionTable exhandlers(_method());
1814 int exlength = exhandlers.length();
1815 for(int i = 0; i < exlength; i++) {
1816 //reacquire the table in case a GC happened
1817 ExceptionTable exhandlers(_method());
1818 u2 start_pc = exhandlers.start_pc(i);
1819 u2 end_pc = exhandlers.end_pc(i);
1820 u2 handler_pc = exhandlers.handler_pc(i);
1821 int catch_type_index = exhandlers.catch_type_index(i);
1822 if(bci >= start_pc && bci < end_pc) {
1823 u1 flags = current_frame->flags();
1824 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1825 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1826 if (catch_type_index != 0) {
1827 // We know that this index refers to a subclass of Throwable
1828 VerificationType catch_type = cp_index_to_type(
1829 catch_type_index, cp, CHECK_VERIFY(this));
1830 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1831 } else {
1832 VerificationType throwable =
1833 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1834 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1835 }
1836 ErrorContext ctx;
1837 bool matches = stackmap_table->match_stackmap(
1838 new_frame, handler_pc, true, false, &ctx, CHECK_VERIFY(this));
1839 if (!matches) {
1840 verify_error(ctx, "Stack map does not match the one at "
1841 "exception handler %d", handler_pc);
1842 return;
1843 }
1844 }
1845 }
1846 }
1847
1848 void ClassVerifier::verify_cp_index(
1849 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1850 int nconstants = cp->length();
1851 if ((index <= 0) || (index >= nconstants)) {
1852 verify_error(ErrorContext::bad_cp_index(bci, index),
1853 "Illegal constant pool index %d in class %s",
1854 index, cp->pool_holder()->external_name());
1855 return;
1856 }
1857 }
1858
1859 void ClassVerifier::verify_cp_type(
1860 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1861
1862 // In some situations, bytecode rewriting may occur while we're verifying.
1863 // In this case, a constant pool cache exists and some indices refer to that
1864 // instead. Be sure we don't pick up such indices by accident.
1865 // We must check was_recursively_verified() before we get here.
1866 guarantee(cp->cache() == NULL, "not rewritten yet");
1867
1868 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1869 unsigned int tag = cp->tag_at(index).value();
1870 if ((types & (1 << tag)) == 0) {
1871 verify_error(ErrorContext::bad_cp_index(bci, index),
1872 "Illegal type at constant pool entry %d in class %s",
1873 index, cp->pool_holder()->external_name());
1874 return;
1875 }
1876 }
1877
1878 void ClassVerifier::verify_cp_class_type(
1879 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1880 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1881 constantTag tag = cp->tag_at(index);
1882 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1883 verify_error(ErrorContext::bad_cp_index(bci, index),
1884 "Illegal type at constant pool entry %d in class %s",
1885 index, cp->pool_holder()->external_name());
1886 return;
1887 }
1888 }
1889
1890 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1891 stringStream ss;
1892
1893 ctx.reset_frames();
1894 _exception_type = vmSymbols::java_lang_VerifyError();
1895 _error_context = ctx;
1896 va_list va;
1897 va_start(va, msg);
1898 ss.vprint(msg, va);
1899 va_end(va);
1900 _message = ss.as_string();
1901 #ifdef ASSERT
1902 ResourceMark rm;
1903 const char* exception_name = _exception_type->as_C_string();
1904 Exceptions::debug_check_abort(exception_name, NULL);
1905 #endif // ndef ASSERT
1906 }
1907
1908 void ClassVerifier::class_format_error(const char* msg, ...) {
1909 stringStream ss;
1910 _exception_type = vmSymbols::java_lang_ClassFormatError();
1911 va_list va;
1912 va_start(va, msg);
1913 ss.vprint(msg, va);
1914 va_end(va);
1915 if (!_method.is_null()) {
1916 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1917 }
1918 _message = ss.as_string();
1919 }
1920
1921 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1922 // Get current loader and protection domain first.
1923 oop loader = current_class()->class_loader();
1924 oop protection_domain = current_class()->protection_domain();
1925
1926 return SystemDictionary::resolve_or_fail(
1927 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1928 true, CHECK_NULL);
1929 }
1930
1931 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1932 Klass* target_class,
1933 Symbol* field_name,
1934 Symbol* field_sig,
1935 bool is_method) {
1936 No_Safepoint_Verifier nosafepoint;
1937
1938 // If target class isn't a super class of this class, we don't worry about this case
1939 if (!this_class->is_subclass_of(target_class)) {
1940 return false;
1941 }
1942 // Check if the specified method or field is protected
1943 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1944 fieldDescriptor fd;
1945 if (is_method) {
1946 Method* m = target_instance->uncached_lookup_method(field_name, field_sig);
1947 if (m != NULL && m->is_protected()) {
1948 if (!this_class->is_same_class_package(m->method_holder())) {
1949 return true;
1950 }
1951 }
1952 } else {
1953 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1954 if (member_klass != NULL && fd.is_protected()) {
1955 if (!this_class->is_same_class_package(member_klass)) {
1956 return true;
1957 }
1958 }
1959 }
1960 return false;
1961 }
1962
1963 void ClassVerifier::verify_ldc(
1964 int opcode, u2 index, StackMapFrame* current_frame,
1965 constantPoolHandle cp, u2 bci, TRAPS) {
1966 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1967 constantTag tag = cp->tag_at(index);
1968 unsigned int types;
1969 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1970 if (!tag.is_unresolved_klass()) {
1971 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1972 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1973 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1974 // Note: The class file parser already verified the legality of
1975 // MethodHandle and MethodType constants.
1976 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1977 }
1978 } else {
1979 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1980 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1981 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1982 }
1983 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1984 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1985 } else if (tag.is_string()) {
1986 current_frame->push_stack(
1987 VerificationType::reference_type(
1988 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1989 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1990 current_frame->push_stack(
1991 VerificationType::reference_type(
1992 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
1993 } else if (tag.is_int()) {
1994 current_frame->push_stack(
1995 VerificationType::integer_type(), CHECK_VERIFY(this));
1996 } else if (tag.is_float()) {
1997 current_frame->push_stack(
1998 VerificationType::float_type(), CHECK_VERIFY(this));
1999 } else if (tag.is_double()) {
2000 current_frame->push_stack_2(
2001 VerificationType::double_type(),
2002 VerificationType::double2_type(), CHECK_VERIFY(this));
2003 } else if (tag.is_long()) {
2004 current_frame->push_stack_2(
2005 VerificationType::long_type(),
2006 VerificationType::long2_type(), CHECK_VERIFY(this));
2007 } else if (tag.is_method_handle()) {
2008 current_frame->push_stack(
2009 VerificationType::reference_type(
2010 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2011 } else if (tag.is_method_type()) {
2012 current_frame->push_stack(
2013 VerificationType::reference_type(
2014 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2015 } else {
2016 /* Unreachable? verify_cp_type has already validated the cp type. */
2017 verify_error(
2018 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2019 return;
2020 }
2021 }
2022
2023 void ClassVerifier::verify_switch(
2024 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2025 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2026 int bci = bcs->bci();
2027 address bcp = bcs->bcp();
2028 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2029
2030 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2031 // 4639449 & 4647081: padding bytes must be 0
2032 u2 padding_offset = 1;
2033 while ((bcp + padding_offset) < aligned_bcp) {
2034 if(*(bcp + padding_offset) != 0) {
2035 verify_error(ErrorContext::bad_code(bci),
2036 "Nonzero padding byte in lookswitch or tableswitch");
2037 return;
2038 }
2039 padding_offset++;
2040 }
2041 }
2042
2043 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2044 int keys, delta;
2045 current_frame->pop_stack(
2046 VerificationType::integer_type(), CHECK_VERIFY(this));
2047 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2048 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2049 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2050 if (low > high) {
2051 verify_error(ErrorContext::bad_code(bci),
2052 "low must be less than or equal to high in tableswitch");
2053 return;
2054 }
2055 keys = high - low + 1;
2056 if (keys < 0) {
2057 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2058 return;
2059 }
2060 delta = 1;
2061 } else {
2062 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2063 if (keys < 0) {
2064 verify_error(ErrorContext::bad_code(bci),
2065 "number of keys in lookupswitch less than 0");
2066 return;
2067 }
2068 delta = 2;
2069 // Make sure that the lookupswitch items are sorted
2070 for (int i = 0; i < (keys - 1); i++) {
2071 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2072 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2073 if (this_key >= next_key) {
2074 verify_error(ErrorContext::bad_code(bci),
2075 "Bad lookupswitch instruction");
2076 return;
2077 }
2078 }
2079 }
2080 int target = bci + default_offset;
2081 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2082 for (int i = 0; i < keys; i++) {
2083 // Because check_jump_target() may safepoint, the bytecode could have
2084 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2085 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2086 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2087 stackmap_table->check_jump_target(
2088 current_frame, target, CHECK_VERIFY(this));
2089 }
2090 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2091 }
2092
2093 bool ClassVerifier::name_in_supers(
2094 Symbol* ref_name, instanceKlassHandle current) {
2095 Klass* super = current->super();
2096 while (super != NULL) {
2097 if (super->name() == ref_name) {
2098 return true;
2099 }
2100 super = super->super();
2101 }
2102 return false;
2103 }
2104
2105 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2106 StackMapFrame* current_frame,
2107 constantPoolHandle cp,
2108 TRAPS) {
2109 u2 index = bcs->get_index_u2();
2110 verify_cp_type(bcs->bci(), index, cp,
2111 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2112
2113 // Get field name and signature
2114 Symbol* field_name = cp->name_ref_at(index);
2115 Symbol* field_sig = cp->signature_ref_at(index);
2116
2117 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2118 class_format_error(
2119 "Invalid signature for field in class %s referenced "
2120 "from constant pool index %d", _klass->external_name(), index);
2121 return;
2122 }
2123
2124 // Get referenced class type
2125 VerificationType ref_class_type = cp_ref_index_to_type(
2126 index, cp, CHECK_VERIFY(this));
2127 if (!ref_class_type.is_object()) {
2128 /* Unreachable? Class file parser verifies Fieldref contents */
2129 verify_error(ErrorContext::bad_type(bcs->bci(),
2130 TypeOrigin::cp(index, ref_class_type)),
2131 "Expecting reference to class in class %s at constant pool index %d",
2132 _klass->external_name(), index);
2133 return;
2134 }
2135 VerificationType target_class_type = ref_class_type;
2136
2137 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2138 "buffer type must match VerificationType size");
2139 uintptr_t field_type_buffer[2];
2140 VerificationType* field_type = (VerificationType*)field_type_buffer;
2141 // If we make a VerificationType[2] array directly, the compiler calls
2142 // to the c-runtime library to do the allocation instead of just
2143 // stack allocating it. Plus it would run constructors. This shows up
2144 // in performance profiles.
2145
2146 SignatureStream sig_stream(field_sig, false);
2147 VerificationType stack_object_type;
2148 int n = change_sig_to_verificationType(
2149 &sig_stream, field_type, CHECK_VERIFY(this));
2150 u2 bci = bcs->bci();
2151 bool is_assignable;
2152 switch (bcs->raw_code()) {
2153 case Bytecodes::_getstatic: {
2154 for (int i = 0; i < n; i++) {
2155 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2156 }
2157 break;
2158 }
2159 case Bytecodes::_putstatic: {
2160 for (int i = n - 1; i >= 0; i--) {
2161 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2162 }
2163 break;
2164 }
2165 case Bytecodes::_getfield: {
2166 stack_object_type = current_frame->pop_stack(
2167 target_class_type, CHECK_VERIFY(this));
2168 for (int i = 0; i < n; i++) {
2169 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2170 }
2171 goto check_protected;
2172 }
2173 case Bytecodes::_putfield: {
2174 for (int i = n - 1; i >= 0; i--) {
2175 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2176 }
2177 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2178
2179 // The JVMS 2nd edition allows field initialization before the superclass
2180 // initializer, if the field is defined within the current class.
2181 fieldDescriptor fd;
2182 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2183 target_class_type.equals(current_type()) &&
2184 _klass->find_local_field(field_name, field_sig, &fd)) {
2185 stack_object_type = current_type();
2186 }
2187 is_assignable = target_class_type.is_assignable_from(
2188 stack_object_type, this, CHECK_VERIFY(this));
2189 if (!is_assignable) {
2190 verify_error(ErrorContext::bad_type(bci,
2191 current_frame->stack_top_ctx(),
2192 TypeOrigin::cp(index, target_class_type)),
2193 "Bad type on operand stack in putfield");
2194 return;
2195 }
2196 }
2197 check_protected: {
2198 if (_this_type == stack_object_type)
2199 break; // stack_object_type must be assignable to _current_class_type
2200 Symbol* ref_class_name =
2201 cp->klass_name_at(cp->klass_ref_index_at(index));
2202 if (!name_in_supers(ref_class_name, current_class()))
2203 // stack_object_type must be assignable to _current_class_type since:
2204 // 1. stack_object_type must be assignable to ref_class.
2205 // 2. ref_class must be _current_class or a subclass of it. It can't
2206 // be a superclass of it. See revised JVMS 5.4.4.
2207 break;
2208
2209 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2210 if (is_protected_access(current_class(), ref_class_oop, field_name,
2211 field_sig, false)) {
2212 // It's protected access, check if stack object is assignable to
2213 // current class.
2214 is_assignable = current_type().is_assignable_from(
2215 stack_object_type, this, CHECK_VERIFY(this));
2216 if (!is_assignable) {
2217 verify_error(ErrorContext::bad_type(bci,
2218 current_frame->stack_top_ctx(),
2219 TypeOrigin::implicit(current_type())),
2220 "Bad access to protected data in getfield");
2221 return;
2222 }
2223 }
2224 break;
2225 }
2226 default: ShouldNotReachHere();
2227 }
2228 }
2229
2230 void ClassVerifier::verify_invoke_init(
2231 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2232 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2233 constantPoolHandle cp, TRAPS) {
2234 u2 bci = bcs->bci();
2235 VerificationType type = current_frame->pop_stack(
2236 VerificationType::reference_check(), CHECK_VERIFY(this));
2237 if (type == VerificationType::uninitialized_this_type()) {
2238 // The method must be an <init> method of this class or its superclass
2239 Klass* superk = current_class()->super();
2240 if (ref_class_type.name() != current_class()->name() &&
2241 ref_class_type.name() != superk->name()) {
2242 verify_error(ErrorContext::bad_type(bci,
2243 TypeOrigin::implicit(ref_class_type),
2244 TypeOrigin::implicit(current_type())),
2245 "Bad <init> method call");
2246 return;
2247 }
2248 current_frame->initialize_object(type, current_type());
2249 *this_uninit = true;
2250 } else if (type.is_uninitialized()) {
2251 u2 new_offset = type.bci();
2252 address new_bcp = bcs->bcp() - bci + new_offset;
2253 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2254 /* Unreachable? Stack map parsing ensures valid type and new
2255 * instructions have a valid BCI. */
2256 verify_error(ErrorContext::bad_code(new_offset),
2257 "Expecting new instruction");
2258 return;
2259 }
2260 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2261 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2262
2263 // The method must be an <init> method of the indicated class
2264 VerificationType new_class_type = cp_index_to_type(
2265 new_class_index, cp, CHECK_VERIFY(this));
2266 if (!new_class_type.equals(ref_class_type)) {
2267 verify_error(ErrorContext::bad_type(bci,
2268 TypeOrigin::cp(new_class_index, new_class_type),
2269 TypeOrigin::cp(ref_class_index, ref_class_type)),
2270 "Call to wrong <init> method");
2271 return;
2272 }
2273 // According to the VM spec, if the referent class is a superclass of the
2274 // current class, and is in a different runtime package, and the method is
2275 // protected, then the objectref must be the current class or a subclass
2276 // of the current class.
2277 VerificationType objectref_type = new_class_type;
2278 if (name_in_supers(ref_class_type.name(), current_class())) {
2279 Klass* ref_klass = load_class(
2280 ref_class_type.name(), CHECK_VERIFY(this));
2281 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2282 vmSymbols::object_initializer_name(),
2283 cp->signature_ref_at(bcs->get_index_u2()));
2284 instanceKlassHandle mh(THREAD, m->method_holder());
2285 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2286 bool assignable = current_type().is_assignable_from(
2287 objectref_type, this, CHECK_VERIFY(this));
2288 if (!assignable) {
2289 verify_error(ErrorContext::bad_type(bci,
2290 TypeOrigin::cp(new_class_index, objectref_type),
2291 TypeOrigin::implicit(current_type())),
2292 "Bad access to protected <init> method");
2293 return;
2294 }
2295 }
2296 }
2297 current_frame->initialize_object(type, new_class_type);
2298 } else {
2299 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2300 "Bad operand type when invoking <init>");
2301 return;
2302 }
2303 }
2304
2305 bool ClassVerifier::is_same_or_direct_interface(
2306 instanceKlassHandle klass,
2307 VerificationType klass_type,
2308 VerificationType ref_class_type) {
2309 if (ref_class_type.equals(klass_type)) return true;
2310 Array<Klass*>* local_interfaces = klass->local_interfaces();
2311 if (local_interfaces != NULL) {
2312 for (int x = 0; x < local_interfaces->length(); x++) {
2313 Klass* k = local_interfaces->at(x);
2314 assert (k != NULL && k->is_interface(), "invalid interface");
2315 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2316 return true;
2317 }
2318 }
2319 }
2320 return false;
2321 }
2322
2323 void ClassVerifier::verify_invoke_instructions(
2324 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2325 bool *this_uninit, VerificationType return_type,
2326 constantPoolHandle cp, TRAPS) {
2327 // Make sure the constant pool item is the right type
2328 u2 index = bcs->get_index_u2();
2329 Bytecodes::Code opcode = bcs->raw_code();
2330 unsigned int types;
2331 switch (opcode) {
2332 case Bytecodes::_invokeinterface:
2333 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2334 break;
2335 case Bytecodes::_invokedynamic:
2336 types = 1 << JVM_CONSTANT_InvokeDynamic;
2337 break;
2338 case Bytecodes::_invokespecial:
2339 case Bytecodes::_invokestatic:
2340 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2341 (1 << JVM_CONSTANT_Methodref) :
2342 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2343 break;
2344 default:
2345 types = 1 << JVM_CONSTANT_Methodref;
2346 }
2347 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2348
2349 // Get method name and signature
2350 Symbol* method_name = cp->name_ref_at(index);
2351 Symbol* method_sig = cp->signature_ref_at(index);
2352
2353 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2354 class_format_error(
2355 "Invalid method signature in class %s referenced "
2356 "from constant pool index %d", _klass->external_name(), index);
2357 return;
2358 }
2359
2360 // Get referenced class type
2361 VerificationType ref_class_type;
2362 if (opcode == Bytecodes::_invokedynamic) {
2363 if (!EnableInvokeDynamic ||
2364 _klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2365 class_format_error(
2366 (!EnableInvokeDynamic ?
2367 "invokedynamic instructions not enabled in this JVM" :
2368 "invokedynamic instructions not supported by this class file version"),
2369 _klass->external_name());
2370 return;
2371 }
2372 } else {
2373 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2374 }
2375
2376 // For a small signature length, we just allocate 128 bytes instead
2377 // of parsing the signature once to find its size.
2378 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2379 // longs/doubles to be consertive.
2380 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2381 "buffer type must match VerificationType size");
2382 uintptr_t on_stack_sig_types_buffer[128];
2383 // If we make a VerificationType[128] array directly, the compiler calls
2384 // to the c-runtime library to do the allocation instead of just
2385 // stack allocating it. Plus it would run constructors. This shows up
2386 // in performance profiles.
2387
2388 VerificationType* sig_types;
2389 int size = (method_sig->utf8_length() - 3) * 2;
2390 if (size > 128) {
2391 // Long and double occupies two slots here.
2392 ArgumentSizeComputer size_it(method_sig);
2393 size = size_it.size();
2394 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2395 } else{
2396 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2397 }
2398 SignatureStream sig_stream(method_sig);
2399 int sig_i = 0;
2400 while (!sig_stream.at_return_type()) {
2401 sig_i += change_sig_to_verificationType(
2402 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2403 sig_stream.next();
2404 }
2405 int nargs = sig_i;
2406
2407 #ifdef ASSERT
2408 {
2409 ArgumentSizeComputer size_it(method_sig);
2410 assert(nargs == size_it.size(), "Argument sizes do not match");
2411 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2412 }
2413 #endif
2414
2415 // Check instruction operands
2416 u2 bci = bcs->bci();
2417 if (opcode == Bytecodes::_invokeinterface) {
2418 address bcp = bcs->bcp();
2419 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2420 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2421 // the difference between the size of the operand stack before and after the instruction
2422 // executes.
2423 if (*(bcp+3) != (nargs+1)) {
2424 verify_error(ErrorContext::bad_code(bci),
2425 "Inconsistent args count operand in invokeinterface");
2426 return;
2427 }
2428 if (*(bcp+4) != 0) {
2429 verify_error(ErrorContext::bad_code(bci),
2430 "Fourth operand byte of invokeinterface must be zero");
2431 return;
2432 }
2433 }
2434
2435 if (opcode == Bytecodes::_invokedynamic) {
2436 address bcp = bcs->bcp();
2437 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2438 verify_error(ErrorContext::bad_code(bci),
2439 "Third and fourth operand bytes of invokedynamic must be zero");
2440 return;
2441 }
2442 }
2443
2444 if (method_name->byte_at(0) == '<') {
2445 // Make sure <init> can only be invoked by invokespecial
2446 if (opcode != Bytecodes::_invokespecial ||
2447 method_name != vmSymbols::object_initializer_name()) {
2448 verify_error(ErrorContext::bad_code(bci),
2449 "Illegal call to internal method");
2450 return;
2451 }
2452 } else if (opcode == Bytecodes::_invokespecial
2453 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2454 && !ref_class_type.equals(VerificationType::reference_type(
2455 current_class()->super()->name()))) {
2456 bool subtype = false;
2457 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2458 if (!current_class()->is_anonymous()) {
2459 subtype = ref_class_type.is_assignable_from(
2460 current_type(), this, CHECK_VERIFY(this));
2461 } else {
2462 VerificationType host_klass_type =
2463 VerificationType::reference_type(current_class()->host_klass()->name());
2464 subtype = ref_class_type.is_assignable_from(host_klass_type, this, CHECK_VERIFY(this));
2465
2466 // If invokespecial of IMR, need to recheck for same or
2467 // direct interface relative to the host class
2468 have_imr_indirect = (have_imr_indirect &&
2469 !is_same_or_direct_interface(
2470 InstanceKlass::cast(current_class()->host_klass()),
2471 host_klass_type, ref_class_type));
2472 }
2473 if (!subtype) {
2474 verify_error(ErrorContext::bad_code(bci),
2475 "Bad invokespecial instruction: "
2476 "current class isn't assignable to reference class.");
2477 return;
2478 } else if (have_imr_indirect) {
2479 verify_error(ErrorContext::bad_code(bci),
2480 "Bad invokespecial instruction: "
2481 "interface method reference is in an indirect superinterface.");
2482 return;
2483 }
2484
2485 }
2486 // Match method descriptor with operand stack
2487 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2488 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2489 }
2490 // Check objectref on operand stack
2491 if (opcode != Bytecodes::_invokestatic &&
2492 opcode != Bytecodes::_invokedynamic) {
2493 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2494 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2495 code_length, this_uninit, cp, CHECK_VERIFY(this));
2496 } else { // other methods
2497 // Ensures that target class is assignable to method class.
2498 if (opcode == Bytecodes::_invokespecial) {
2499 if (!current_class()->is_anonymous()) {
2500 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2501 } else {
2502 // anonymous class invokespecial calls: check if the
2503 // objectref is a subtype of the host_klass of the current class
2504 // to allow an anonymous class to reference methods in the host_klass
2505 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2506 VerificationType hosttype =
2507 VerificationType::reference_type(current_class()->host_klass()->name());
2508 bool subtype = hosttype.is_assignable_from(top, this, CHECK_VERIFY(this));
2509 if (!subtype) {
2510 verify_error( ErrorContext::bad_type(current_frame->offset(),
2511 current_frame->stack_top_ctx(),
2512 TypeOrigin::implicit(top)),
2513 "Bad type on operand stack");
2514 return;
2515 }
2516 }
2517 } else if (opcode == Bytecodes::_invokevirtual) {
2518 VerificationType stack_object_type =
2519 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2520 if (current_type() != stack_object_type) {
2521 assert(cp->cache() == NULL, "not rewritten yet");
2522 Symbol* ref_class_name =
2523 cp->klass_name_at(cp->klass_ref_index_at(index));
2524 // See the comments in verify_field_instructions() for
2525 // the rationale behind this.
2526 if (name_in_supers(ref_class_name, current_class())) {
2527 Klass* ref_class = load_class(ref_class_name, CHECK);
2528 if (is_protected_access(
2529 _klass, ref_class, method_name, method_sig, true)) {
2530 // It's protected access, check if stack object is
2531 // assignable to current class.
2532 bool is_assignable = current_type().is_assignable_from(
2533 stack_object_type, this, CHECK_VERIFY(this));
2534 if (!is_assignable) {
2535 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2536 && stack_object_type.is_array()
2537 && method_name == vmSymbols::clone_name()) {
2538 // Special case: arrays pretend to implement public Object
2539 // clone().
2540 } else {
2541 verify_error(ErrorContext::bad_type(bci,
2542 current_frame->stack_top_ctx(),
2543 TypeOrigin::implicit(current_type())),
2544 "Bad access to protected data in invokevirtual");
2545 return;
2546 }
2547 }
2548 }
2549 }
2550 }
2551 } else {
2552 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2553 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2554 }
2555 }
2556 }
2557 // Push the result type.
2558 if (sig_stream.type() != T_VOID) {
2559 if (method_name == vmSymbols::object_initializer_name()) {
2560 // <init> method must have a void return type
2561 /* Unreachable? Class file parser verifies that methods with '<' have
2562 * void return */
2563 verify_error(ErrorContext::bad_code(bci),
2564 "Return type must be void in <init> method");
2565 return;
2566 }
2567 VerificationType return_type[2];
2568 int n = change_sig_to_verificationType(
2569 &sig_stream, return_type, CHECK_VERIFY(this));
2570 for (int i = 0; i < n; i++) {
2571 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2572 }
2573 }
2574 }
2575
2576 VerificationType ClassVerifier::get_newarray_type(
2577 u2 index, u2 bci, TRAPS) {
2578 const char* from_bt[] = {
2579 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2580 };
2581 if (index < T_BOOLEAN || index > T_LONG) {
2582 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2583 return VerificationType::bogus_type();
2584 }
2585
2586 // from_bt[index] contains the array signature which has a length of 2
2587 Symbol* sig = create_temporary_symbol(
2588 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2589 return VerificationType::reference_type(sig);
2590 }
2591
2592 void ClassVerifier::verify_anewarray(
2593 u2 bci, u2 index, constantPoolHandle cp,
2594 StackMapFrame* current_frame, TRAPS) {
2595 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2596 current_frame->pop_stack(
2597 VerificationType::integer_type(), CHECK_VERIFY(this));
2598
2599 VerificationType component_type =
2600 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2601 int length;
2602 char* arr_sig_str;
2603 if (component_type.is_array()) { // it's an array
2604 const char* component_name = component_type.name()->as_utf8();
2605 // add one dimension to component
2606 length = (int)strlen(component_name) + 1;
2607 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2608 arr_sig_str[0] = '[';
2609 strncpy(&arr_sig_str[1], component_name, length - 1);
2610 } else { // it's an object or interface
2611 const char* component_name = component_type.name()->as_utf8();
2612 // add one dimension to component with 'L' prepended and ';' postpended.
2613 length = (int)strlen(component_name) + 3;
2614 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2615 arr_sig_str[0] = '[';
2616 arr_sig_str[1] = 'L';
2617 strncpy(&arr_sig_str[2], component_name, length - 2);
2618 arr_sig_str[length - 1] = ';';
2619 }
2620 Symbol* arr_sig = create_temporary_symbol(
2621 arr_sig_str, length, CHECK_VERIFY(this));
2622 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2623 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2624 }
2625
2626 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2627 current_frame->get_local(
2628 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2629 current_frame->push_stack(
2630 VerificationType::integer_type(), CHECK_VERIFY(this));
2631 }
2632
2633 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2634 current_frame->get_local_2(
2635 index, VerificationType::long_type(),
2636 VerificationType::long2_type(), CHECK_VERIFY(this));
2637 current_frame->push_stack_2(
2638 VerificationType::long_type(),
2639 VerificationType::long2_type(), CHECK_VERIFY(this));
2640 }
2641
2642 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2643 current_frame->get_local(
2644 index, VerificationType::float_type(), CHECK_VERIFY(this));
2645 current_frame->push_stack(
2646 VerificationType::float_type(), CHECK_VERIFY(this));
2647 }
2648
2649 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2650 current_frame->get_local_2(
2651 index, VerificationType::double_type(),
2652 VerificationType::double2_type(), CHECK_VERIFY(this));
2653 current_frame->push_stack_2(
2654 VerificationType::double_type(),
2655 VerificationType::double2_type(), CHECK_VERIFY(this));
2656 }
2657
2658 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2659 VerificationType type = current_frame->get_local(
2660 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2661 current_frame->push_stack(type, CHECK_VERIFY(this));
2662 }
2663
2664 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2665 current_frame->pop_stack(
2666 VerificationType::integer_type(), CHECK_VERIFY(this));
2667 current_frame->set_local(
2668 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2669 }
2670
2671 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2672 current_frame->pop_stack_2(
2673 VerificationType::long2_type(),
2674 VerificationType::long_type(), CHECK_VERIFY(this));
2675 current_frame->set_local_2(
2676 index, VerificationType::long_type(),
2677 VerificationType::long2_type(), CHECK_VERIFY(this));
2678 }
2679
2680 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2681 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2682 current_frame->set_local(
2683 index, VerificationType::float_type(), CHECK_VERIFY(this));
2684 }
2685
2686 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2687 current_frame->pop_stack_2(
2688 VerificationType::double2_type(),
2689 VerificationType::double_type(), CHECK_VERIFY(this));
2690 current_frame->set_local_2(
2691 index, VerificationType::double_type(),
2692 VerificationType::double2_type(), CHECK_VERIFY(this));
2693 }
2694
2695 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2696 VerificationType type = current_frame->pop_stack(
2697 VerificationType::reference_check(), CHECK_VERIFY(this));
2698 current_frame->set_local(index, type, CHECK_VERIFY(this));
2699 }
2700
2701 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2702 VerificationType type = current_frame->get_local(
2703 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2704 current_frame->set_local(index, type, CHECK_VERIFY(this));
2705 }
2706
2707 void ClassVerifier::verify_return_value(
2708 VerificationType return_type, VerificationType type, u2 bci,
2709 StackMapFrame* current_frame, TRAPS) {
2710 if (return_type == VerificationType::bogus_type()) {
2711 verify_error(ErrorContext::bad_type(bci,
2712 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2713 "Method expects a return value");
2714 return;
2715 }
2716 bool match = return_type.is_assignable_from(type, this, CHECK_VERIFY(this));
2717 if (!match) {
2718 verify_error(ErrorContext::bad_type(bci,
2719 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2720 "Bad return type");
2721 return;
2722 }
2723 }
2724
2725 // The verifier creates symbols which are substrings of Symbols.
2726 // These are stored in the verifier until the end of verification so that
2727 // they can be reference counted.
2728 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2729 int end, TRAPS) {
2730 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2731 _symbols->push(sym);
2732 return sym;
2733 }
2734
2735 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2736 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2737 _symbols->push(sym);
2738 return sym;
2739 }