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