1 /*
2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/stackMapTable.hpp"
29 #include "classfile/stackMapFrame.hpp"
30 #include "classfile/stackMapTableFormat.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/bytecodeStream.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "oops/typeArrayOop.hpp"
41 #include "prims/jvm.h"
42 #include "runtime/fieldDescriptor.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/orderAccess.inline.hpp"
47 #include "runtime/os.hpp"
48 #ifdef TARGET_ARCH_x86
49 # include "bytes_x86.hpp"
50 #endif
51 #ifdef TARGET_ARCH_sparc
52 # include "bytes_sparc.hpp"
53 #endif
54 #ifdef TARGET_ARCH_zero
55 # include "bytes_zero.hpp"
56 #endif
57 #ifdef TARGET_ARCH_arm
58 # include "bytes_arm.hpp"
59 #endif
60 #ifdef TARGET_ARCH_ppc
61 # include "bytes_ppc.hpp"
62 #endif
63
64 #define NOFAILOVER_MAJOR_VERSION 51
65 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
66 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
67
68 // Access to external entry for VerifyClassCodes - old byte code verifier
69
70 extern "C" {
71 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
72 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
73 }
74
75 static void* volatile _verify_byte_codes_fn = NULL;
76
77 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
78
79 static void* verify_byte_codes_fn() {
80 if (_verify_byte_codes_fn == NULL) {
81 void *lib_handle = os::native_java_library();
82 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
83 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
84 if (func == NULL) {
85 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
86 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
87 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
88 }
89 }
90 return (void*)_verify_byte_codes_fn;
91 }
92
93
94 // Methods in Verifier
95
96 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
97 return (class_loader == NULL || !should_verify_class) ?
98 BytecodeVerificationLocal : BytecodeVerificationRemote;
99 }
100
101 bool Verifier::relax_verify_for(oop loader) {
102 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
103 bool need_verify =
104 // verifyAll
105 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
106 // verifyRemote
107 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
108 return !need_verify;
109 }
110
111 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
112 HandleMark hm;
113 ResourceMark rm(THREAD);
114
115 Symbol* exception_name = NULL;
116 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
117 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
118 char* exception_message = message_buffer;
119
120 const char* klassName = klass->external_name();
121 bool can_failover = FailOverToOldVerifier &&
122 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
123
124 // If the class should be verified, first see if we can use the split
125 // verifier. If not, or if verification fails and FailOverToOldVerifier
126 // is set, then call the inference verifier.
127 if (is_eligible_for_verification(klass, should_verify_class)) {
128 if (TraceClassInitialization) {
129 tty->print_cr("Start class verification for: %s", klassName);
130 }
131 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
132 ClassVerifier split_verifier(klass, THREAD);
133 split_verifier.verify_class(THREAD);
134 exception_name = split_verifier.result();
135 if (can_failover && !HAS_PENDING_EXCEPTION &&
136 (exception_name == vmSymbols::java_lang_VerifyError() ||
137 exception_name == vmSymbols::java_lang_ClassFormatError())) {
138 if (TraceClassInitialization || VerboseVerification) {
139 tty->print_cr(
140 "Fail over class verification to old verifier for: %s", klassName);
141 }
142 exception_name = inference_verify(
143 klass, message_buffer, message_buffer_len, THREAD);
144 }
145 if (exception_name != NULL) {
146 exception_message = split_verifier.exception_message();
147 }
148 } else {
149 exception_name = inference_verify(
150 klass, message_buffer, message_buffer_len, THREAD);
151 }
152
153 if (TraceClassInitialization || VerboseVerification) {
154 if (HAS_PENDING_EXCEPTION) {
155 tty->print("Verification for %s has", klassName);
156 tty->print_cr(" exception pending %s ",
157 InstanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
158 } else if (exception_name != NULL) {
159 tty->print_cr("Verification for %s failed", klassName);
160 }
161 tty->print_cr("End class verification for: %s", klassName);
162 }
163 }
164
165 if (HAS_PENDING_EXCEPTION) {
166 return false; // use the existing exception
167 } else if (exception_name == NULL) {
168 return true; // verifcation succeeded
169 } else { // VerifyError or ClassFormatError to be created and thrown
170 ResourceMark rm(THREAD);
171 instanceKlassHandle kls =
172 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
173 while (!kls.is_null()) {
174 if (kls == klass) {
175 // If the class being verified is the exception we're creating
176 // or one of it's superclasses, we're in trouble and are going
177 // to infinitely recurse when we try to initialize the exception.
178 // So bail out here by throwing the preallocated VM error.
179 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
180 }
181 kls = kls->super();
182 }
183 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
184 THROW_MSG_(exception_name, exception_message, false);
185 }
186 }
187
188 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
189 Symbol* name = klass->name();
190 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
191
192 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
193
194 return (should_verify_for(klass->class_loader(), should_verify_class) &&
195 // return if the class is a bootstrapping class
196 // or defineClass specified not to verify by default (flags override passed arg)
197 // We need to skip the following four for bootstraping
198 name != vmSymbols::java_lang_Object() &&
199 name != vmSymbols::java_lang_Class() &&
200 name != vmSymbols::java_lang_String() &&
201 name != vmSymbols::java_lang_Throwable() &&
202
203 // Can not verify the bytecodes for shared classes because they have
204 // already been rewritten to contain constant pool cache indices,
205 // which the verifier can't understand.
206 // Shared classes shouldn't have stackmaps either.
207 !klass()->is_shared() &&
208
209 // As of the fix for 4486457 we disable verification for all of the
210 // dynamically-generated bytecodes associated with the 1.4
211 // reflection implementation, not just those associated with
212 // sun/reflect/SerializationConstructorAccessor.
213 // NOTE: this is called too early in the bootstrapping process to be
214 // guarded by Universe::is_gte_jdk14x_version().
215 // Also for lambda generated code, gte jdk8
216 (!is_reflect));
217 }
218
219 Symbol* Verifier::inference_verify(
220 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
221 JavaThread* thread = (JavaThread*)THREAD;
222 JNIEnv *env = thread->jni_environment();
223
224 void* verify_func = verify_byte_codes_fn();
225
226 if (verify_func == NULL) {
227 jio_snprintf(message, message_len, "Could not link verifier");
228 return vmSymbols::java_lang_VerifyError();
229 }
230
231 ResourceMark rm(THREAD);
232 if (VerboseVerification) {
233 tty->print_cr("Verifying class %s with old format", klass->external_name());
234 }
235
236 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
237 jint result;
238
239 {
240 HandleMark hm(thread);
241 ThreadToNativeFromVM ttn(thread);
242 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
243 // code knows that we have left the VM
244
245 if (_is_new_verify_byte_codes_fn) {
246 verify_byte_codes_fn_new_t func =
247 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
248 result = (*func)(env, cls, message, (int)message_len,
249 klass->major_version());
250 } else {
251 verify_byte_codes_fn_t func =
252 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
253 result = (*func)(env, cls, message, (int)message_len);
254 }
255 }
256
257 JNIHandles::destroy_local(cls);
258
259 // These numbers are chosen so that VerifyClassCodes interface doesn't need
260 // to be changed (still return jboolean (unsigned char)), and result is
261 // 1 when verification is passed.
262 if (result == 0) {
263 return vmSymbols::java_lang_VerifyError();
264 } else if (result == 1) {
265 return NULL; // verified.
266 } else if (result == 2) {
267 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
268 } else if (result == 3) {
269 return vmSymbols::java_lang_ClassFormatError();
270 } else {
271 ShouldNotReachHere();
272 return NULL;
273 }
274 }
275
276 TypeOrigin TypeOrigin::null() {
277 return TypeOrigin();
278 }
279 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
280 assert(frame != NULL, "Must have a frame");
281 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
282 frame->local_at(index));
283 }
284 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
285 assert(frame != NULL, "Must have a frame");
286 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
287 frame->stack_at(index));
288 }
289 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
290 assert(frame != NULL, "Must have a frame");
291 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
292 frame->local_at(index));
293 }
294 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
295 assert(frame != NULL, "Must have a frame");
296 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
297 frame->stack_at(index));
298 }
299 TypeOrigin TypeOrigin::bad_index(u2 index) {
300 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
301 }
302 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
303 return TypeOrigin(CONST_POOL, index, NULL, vt);
304 }
305 TypeOrigin TypeOrigin::signature(VerificationType vt) {
306 return TypeOrigin(SIG, 0, NULL, vt);
307 }
308 TypeOrigin TypeOrigin::implicit(VerificationType t) {
309 return TypeOrigin(IMPLICIT, 0, NULL, t);
310 }
311 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
312 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
313 VerificationType::bogus_type());
314 }
315
316 void TypeOrigin::reset_frame() {
317 if (_frame != NULL) {
318 _frame->restore();
319 }
320 }
321
322 void TypeOrigin::details(outputStream* ss) const {
323 _type.print_on(ss);
324 switch (_origin) {
325 case CF_LOCALS:
326 ss->print(" (current frame, locals[%d])", _index);
327 break;
328 case CF_STACK:
329 ss->print(" (current frame, stack[%d])", _index);
330 break;
331 case SM_LOCALS:
332 ss->print(" (stack map, locals[%d])", _index);
333 break;
334 case SM_STACK:
335 ss->print(" (stack map, stack[%d])", _index);
336 break;
337 case CONST_POOL:
338 ss->print(" (constant pool %d)", _index);
339 break;
340 case SIG:
341 ss->print(" (from method signature)");
342 break;
343 case IMPLICIT:
344 case FRAME_ONLY:
345 case NONE:
346 default:
347 ;
348 }
349 }
350
351 #ifdef ASSERT
352 void TypeOrigin::print_on(outputStream* str) const {
353 str->print("{%d,%d,%p:", _origin, _index, _frame);
354 if (_frame != NULL) {
355 _frame->print_on(str);
356 } else {
357 str->print("null");
358 }
359 str->print(",");
360 _type.print_on(str);
361 str->print("}");
362 }
363 #endif
364
365 void ErrorContext::details(outputStream* ss, const Method* method) const {
366 if (is_valid()) {
367 ss->cr();
368 ss->print_cr("Exception Details:");
369 location_details(ss, method);
370 reason_details(ss);
371 frame_details(ss);
372 bytecode_details(ss, method);
373 handler_details(ss, method);
374 stackmap_details(ss, method);
375 }
376 }
377
378 void ErrorContext::reason_details(outputStream* ss) const {
379 streamIndentor si(ss);
380 ss->indent().print_cr("Reason:");
381 streamIndentor si2(ss);
382 ss->indent().print("%s", "");
383 switch (_fault) {
384 case INVALID_BYTECODE:
385 ss->print("Error exists in the bytecode");
386 break;
387 case WRONG_TYPE:
388 if (_expected.is_valid()) {
389 ss->print("Type ");
390 _type.details(ss);
391 ss->print(" is not assignable to ");
392 _expected.details(ss);
393 } else {
394 ss->print("Invalid type: ");
395 _type.details(ss);
396 }
397 break;
398 case FLAGS_MISMATCH:
399 if (_expected.is_valid()) {
400 ss->print("Current frame's flags are not assignable "
401 "to stack map frame's.");
402 } else {
403 ss->print("Current frame's flags are invalid in this context.");
404 }
405 break;
406 case BAD_CP_INDEX:
407 ss->print("Constant pool index %d is invalid", _type.index());
408 break;
409 case BAD_LOCAL_INDEX:
410 ss->print("Local index %d is invalid", _type.index());
411 break;
412 case LOCALS_SIZE_MISMATCH:
413 ss->print("Current frame's local size doesn't match stackmap.");
414 break;
415 case STACK_SIZE_MISMATCH:
416 ss->print("Current frame's stack size doesn't match stackmap.");
417 break;
418 case STACK_OVERFLOW:
419 ss->print("Exceeded max stack size.");
420 break;
421 case STACK_UNDERFLOW:
422 ss->print("Attempt to pop empty stack.");
423 break;
424 case MISSING_STACKMAP:
425 ss->print("Expected stackmap frame at this location.");
426 break;
427 case BAD_STACKMAP:
428 ss->print("Invalid stackmap specification.");
429 break;
430 case UNKNOWN:
431 default:
432 ShouldNotReachHere();
433 ss->print_cr("Unknown");
434 }
435 ss->cr();
436 }
437
438 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
439 if (_bci != -1 && method != NULL) {
440 streamIndentor si(ss);
441 const char* bytecode_name = "<invalid>";
442 if (method->validate_bci(_bci) != -1) {
443 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
444 if (Bytecodes::is_defined(code)) {
445 bytecode_name = Bytecodes::name(code);
446 } else {
447 bytecode_name = "<illegal>";
448 }
449 }
450 InstanceKlass* ik = method->method_holder();
451 ss->indent().print_cr("Location:");
452 streamIndentor si2(ss);
453 ss->indent().print_cr("%s.%s%s @%d: %s",
454 ik->name()->as_C_string(), method->name()->as_C_string(),
455 method->signature()->as_C_string(), _bci, bytecode_name);
456 }
457 }
458
459 void ErrorContext::frame_details(outputStream* ss) const {
460 streamIndentor si(ss);
461 if (_type.is_valid() && _type.frame() != NULL) {
462 ss->indent().print_cr("Current Frame:");
463 streamIndentor si2(ss);
464 _type.frame()->print_on(ss);
465 }
466 if (_expected.is_valid() && _expected.frame() != NULL) {
467 ss->indent().print_cr("Stackmap Frame:");
468 streamIndentor si2(ss);
469 _expected.frame()->print_on(ss);
470 }
471 }
472
473 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
474 if (method != NULL) {
475 streamIndentor si(ss);
476 ss->indent().print_cr("Bytecode:");
477 streamIndentor si2(ss);
478 ss->print_data(method->code_base(), method->code_size(), false);
479 }
480 }
481
482 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
483 if (method != NULL) {
484 streamIndentor si(ss);
485 ExceptionTable table(method);
486 if (table.length() > 0) {
487 ss->indent().print_cr("Exception Handler Table:");
488 streamIndentor si2(ss);
489 for (int i = 0; i < table.length(); ++i) {
490 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
491 table.end_pc(i), table.handler_pc(i));
492 }
493 }
494 }
495 }
496
497 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
498 if (method != NULL && method->has_stackmap_table()) {
499 streamIndentor si(ss);
500 ss->indent().print_cr("Stackmap Table:");
501 Array<u1>* data = method->stackmap_data();
502 stack_map_table* sm_table =
503 stack_map_table::at((address)data->adr_at(0));
504 stack_map_frame* sm_frame = sm_table->entries();
505 streamIndentor si2(ss);
506 int current_offset = -1;
507 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
508 ss->indent();
509 sm_frame->print_on(ss, current_offset);
510 ss->cr();
511 current_offset += sm_frame->offset_delta();
512 sm_frame = sm_frame->next();
513 }
514 }
515 }
516
517 // Methods in ClassVerifier
518
519 ClassVerifier::ClassVerifier(
520 instanceKlassHandle klass, TRAPS)
521 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
522 _this_type = VerificationType::reference_type(klass->name());
523 // Create list to hold symbols in reference area.
524 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
525 }
526
527 ClassVerifier::~ClassVerifier() {
528 // Decrement the reference count for any symbols created.
529 for (int i = 0; i < _symbols->length(); i++) {
530 Symbol* s = _symbols->at(i);
531 s->decrement_refcount();
532 }
533 }
534
535 VerificationType ClassVerifier::object_type() const {
536 return VerificationType::reference_type(vmSymbols::java_lang_Object());
537 }
538
539 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) {
540 VerificationType vt = VerificationType::reference_type(
541 create_temporary_symbol(sig, (int)strlen(sig), THREAD));
542 return TypeOrigin::implicit(vt);
543 }
544
545 void ClassVerifier::verify_class(TRAPS) {
546 if (VerboseVerification) {
547 tty->print_cr("Verifying class %s with new format",
548 _klass->external_name());
549 }
550
551 Array<Method*>* methods = _klass->methods();
552 int num_methods = methods->length();
553
554 for (int index = 0; index < num_methods; index++) {
555 // Check for recursive re-verification before each method.
556 if (was_recursively_verified()) return;
557
558 Method* m = methods->at(index);
559 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
560 // If m is native or abstract, skip it. It is checked in class file
561 // parser that methods do not override a final method. Overpass methods
562 // are trusted since the VM generates them.
563 continue;
564 }
565 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
566 }
567
568 if (VerboseVerification || TraceClassInitialization) {
569 if (was_recursively_verified())
570 tty->print_cr("Recursive verification detected for: %s",
571 _klass->external_name());
572 }
573 }
574
575 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
576 HandleMark hm(THREAD);
577 _method = m; // initialize _method
578 if (VerboseVerification) {
579 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
580 }
581
582 // For clang, the only good constant format string is a literal constant format string.
583 #define bad_type_msg "Bad type on operand stack in %s"
584
585 int32_t max_stack = m->verifier_max_stack();
586 int32_t max_locals = m->max_locals();
587 constantPoolHandle cp(THREAD, m->constants());
588
589 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
590 class_format_error("Invalid method signature");
591 return;
592 }
593
594 // Initial stack map frame: offset is 0, stack is initially empty.
595 StackMapFrame current_frame(max_locals, max_stack, this);
596 // Set initial locals
597 VerificationType return_type = current_frame.set_locals_from_arg(
598 m, current_type(), CHECK_VERIFY(this));
599
600 int32_t stackmap_index = 0; // index to the stackmap array
601
602 u4 code_length = m->code_size();
603
604 // Scan the bytecode and map each instruction's start offset to a number.
605 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
606
607 int ex_min = code_length;
608 int ex_max = -1;
609 // Look through each item on the exception table. Each of the fields must refer
610 // to a legal instruction.
611 verify_exception_handler_table(
612 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
613
614 // Look through each entry on the local variable table and make sure
615 // its range of code array offsets is valid. (4169817)
616 if (m->has_localvariable_table()) {
617 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
618 }
619
620 Array<u1>* stackmap_data = m->stackmap_data();
621 StackMapStream stream(stackmap_data);
622 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
623 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
624 code_data, code_length, CHECK_VERIFY(this));
625
626 if (VerboseVerification) {
627 stackmap_table.print_on(tty);
628 }
629
630 RawBytecodeStream bcs(m);
631
632 // Scan the byte code linearly from the start to the end
633 bool no_control_flow = false; // Set to true when there is no direct control
634 // flow from current instruction to the next
635 // instruction in sequence
636 Bytecodes::Code opcode;
637 while (!bcs.is_last_bytecode()) {
638 // Check for recursive re-verification before each bytecode.
639 if (was_recursively_verified()) return;
640
641 opcode = bcs.raw_next();
642 u2 bci = bcs.bci();
643
644 // Set current frame's offset to bci
645 current_frame.set_offset(bci);
646 current_frame.set_mark();
647
648 // Make sure every offset in stackmap table point to the beginning to
649 // an instruction. Match current_frame to stackmap_table entry with
650 // the same offset if exists.
651 stackmap_index = verify_stackmap_table(
652 stackmap_index, bci, ¤t_frame, &stackmap_table,
653 no_control_flow, CHECK_VERIFY(this));
654
655
656 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
657
658 // Merge with the next instruction
659 {
660 u2 index;
661 int target;
662 VerificationType type, type2;
663 VerificationType atype;
664
665 #ifndef PRODUCT
666 if (VerboseVerification) {
667 current_frame.print_on(tty);
668 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
669 }
670 #endif
671
672 // Make sure wide instruction is in correct format
673 if (bcs.is_wide()) {
674 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
675 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
676 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
677 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
678 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
679 opcode != Bytecodes::_dstore) {
680 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
681 * if we encounter a wide instruction that modifies an invalid
682 * opcode (not one of the ones listed above) */
683 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
684 return;
685 }
686 }
687
688 switch (opcode) {
689 case Bytecodes::_nop :
690 no_control_flow = false; break;
691 case Bytecodes::_aconst_null :
692 current_frame.push_stack(
693 VerificationType::null_type(), CHECK_VERIFY(this));
694 no_control_flow = false; break;
695 case Bytecodes::_iconst_m1 :
696 case Bytecodes::_iconst_0 :
697 case Bytecodes::_iconst_1 :
698 case Bytecodes::_iconst_2 :
699 case Bytecodes::_iconst_3 :
700 case Bytecodes::_iconst_4 :
701 case Bytecodes::_iconst_5 :
702 current_frame.push_stack(
703 VerificationType::integer_type(), CHECK_VERIFY(this));
704 no_control_flow = false; break;
705 case Bytecodes::_lconst_0 :
706 case Bytecodes::_lconst_1 :
707 current_frame.push_stack_2(
708 VerificationType::long_type(),
709 VerificationType::long2_type(), CHECK_VERIFY(this));
710 no_control_flow = false; break;
711 case Bytecodes::_fconst_0 :
712 case Bytecodes::_fconst_1 :
713 case Bytecodes::_fconst_2 :
714 current_frame.push_stack(
715 VerificationType::float_type(), CHECK_VERIFY(this));
716 no_control_flow = false; break;
717 case Bytecodes::_dconst_0 :
718 case Bytecodes::_dconst_1 :
719 current_frame.push_stack_2(
720 VerificationType::double_type(),
721 VerificationType::double2_type(), CHECK_VERIFY(this));
722 no_control_flow = false; break;
723 case Bytecodes::_sipush :
724 case Bytecodes::_bipush :
725 current_frame.push_stack(
726 VerificationType::integer_type(), CHECK_VERIFY(this));
727 no_control_flow = false; break;
728 case Bytecodes::_ldc :
729 verify_ldc(
730 opcode, bcs.get_index_u1(), ¤t_frame,
731 cp, bci, CHECK_VERIFY(this));
732 no_control_flow = false; break;
733 case Bytecodes::_ldc_w :
734 case Bytecodes::_ldc2_w :
735 verify_ldc(
736 opcode, bcs.get_index_u2(), ¤t_frame,
737 cp, bci, CHECK_VERIFY(this));
738 no_control_flow = false; break;
739 case Bytecodes::_iload :
740 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
741 no_control_flow = false; break;
742 case Bytecodes::_iload_0 :
743 case Bytecodes::_iload_1 :
744 case Bytecodes::_iload_2 :
745 case Bytecodes::_iload_3 :
746 index = opcode - Bytecodes::_iload_0;
747 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
748 no_control_flow = false; break;
749 case Bytecodes::_lload :
750 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
751 no_control_flow = false; break;
752 case Bytecodes::_lload_0 :
753 case Bytecodes::_lload_1 :
754 case Bytecodes::_lload_2 :
755 case Bytecodes::_lload_3 :
756 index = opcode - Bytecodes::_lload_0;
757 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
758 no_control_flow = false; break;
759 case Bytecodes::_fload :
760 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
761 no_control_flow = false; break;
762 case Bytecodes::_fload_0 :
763 case Bytecodes::_fload_1 :
764 case Bytecodes::_fload_2 :
765 case Bytecodes::_fload_3 :
766 index = opcode - Bytecodes::_fload_0;
767 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
768 no_control_flow = false; break;
769 case Bytecodes::_dload :
770 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
771 no_control_flow = false; break;
772 case Bytecodes::_dload_0 :
773 case Bytecodes::_dload_1 :
774 case Bytecodes::_dload_2 :
775 case Bytecodes::_dload_3 :
776 index = opcode - Bytecodes::_dload_0;
777 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
778 no_control_flow = false; break;
779 case Bytecodes::_aload :
780 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
781 no_control_flow = false; break;
782 case Bytecodes::_aload_0 :
783 case Bytecodes::_aload_1 :
784 case Bytecodes::_aload_2 :
785 case Bytecodes::_aload_3 :
786 index = opcode - Bytecodes::_aload_0;
787 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
788 no_control_flow = false; break;
789 case Bytecodes::_iaload :
790 type = current_frame.pop_stack(
791 VerificationType::integer_type(), CHECK_VERIFY(this));
792 atype = current_frame.pop_stack(
793 VerificationType::reference_check(), CHECK_VERIFY(this));
794 if (!atype.is_int_array()) {
795 verify_error(ErrorContext::bad_type(bci,
796 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
797 bad_type_msg, "iaload");
798 return;
799 }
800 current_frame.push_stack(
801 VerificationType::integer_type(), CHECK_VERIFY(this));
802 no_control_flow = false; break;
803 case Bytecodes::_baload :
804 type = current_frame.pop_stack(
805 VerificationType::integer_type(), CHECK_VERIFY(this));
806 atype = current_frame.pop_stack(
807 VerificationType::reference_check(), CHECK_VERIFY(this));
808 if (!atype.is_bool_array() && !atype.is_byte_array()) {
809 verify_error(
810 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
811 bad_type_msg, "baload");
812 return;
813 }
814 current_frame.push_stack(
815 VerificationType::integer_type(), CHECK_VERIFY(this));
816 no_control_flow = false; break;
817 case Bytecodes::_caload :
818 type = current_frame.pop_stack(
819 VerificationType::integer_type(), CHECK_VERIFY(this));
820 atype = current_frame.pop_stack(
821 VerificationType::reference_check(), CHECK_VERIFY(this));
822 if (!atype.is_char_array()) {
823 verify_error(ErrorContext::bad_type(bci,
824 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
825 bad_type_msg, "caload");
826 return;
827 }
828 current_frame.push_stack(
829 VerificationType::integer_type(), CHECK_VERIFY(this));
830 no_control_flow = false; break;
831 case Bytecodes::_saload :
832 type = current_frame.pop_stack(
833 VerificationType::integer_type(), CHECK_VERIFY(this));
834 atype = current_frame.pop_stack(
835 VerificationType::reference_check(), CHECK_VERIFY(this));
836 if (!atype.is_short_array()) {
837 verify_error(ErrorContext::bad_type(bci,
838 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
839 bad_type_msg, "saload");
840 return;
841 }
842 current_frame.push_stack(
843 VerificationType::integer_type(), CHECK_VERIFY(this));
844 no_control_flow = false; break;
845 case Bytecodes::_laload :
846 type = current_frame.pop_stack(
847 VerificationType::integer_type(), CHECK_VERIFY(this));
848 atype = current_frame.pop_stack(
849 VerificationType::reference_check(), CHECK_VERIFY(this));
850 if (!atype.is_long_array()) {
851 verify_error(ErrorContext::bad_type(bci,
852 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
853 bad_type_msg, "laload");
854 return;
855 }
856 current_frame.push_stack_2(
857 VerificationType::long_type(),
858 VerificationType::long2_type(), CHECK_VERIFY(this));
859 no_control_flow = false; break;
860 case Bytecodes::_faload :
861 type = current_frame.pop_stack(
862 VerificationType::integer_type(), CHECK_VERIFY(this));
863 atype = current_frame.pop_stack(
864 VerificationType::reference_check(), CHECK_VERIFY(this));
865 if (!atype.is_float_array()) {
866 verify_error(ErrorContext::bad_type(bci,
867 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
868 bad_type_msg, "faload");
869 return;
870 }
871 current_frame.push_stack(
872 VerificationType::float_type(), CHECK_VERIFY(this));
873 no_control_flow = false; break;
874 case Bytecodes::_daload :
875 type = current_frame.pop_stack(
876 VerificationType::integer_type(), CHECK_VERIFY(this));
877 atype = current_frame.pop_stack(
878 VerificationType::reference_check(), CHECK_VERIFY(this));
879 if (!atype.is_double_array()) {
880 verify_error(ErrorContext::bad_type(bci,
881 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
882 bad_type_msg, "daload");
883 return;
884 }
885 current_frame.push_stack_2(
886 VerificationType::double_type(),
887 VerificationType::double2_type(), CHECK_VERIFY(this));
888 no_control_flow = false; break;
889 case Bytecodes::_aaload : {
890 type = current_frame.pop_stack(
891 VerificationType::integer_type(), CHECK_VERIFY(this));
892 atype = current_frame.pop_stack(
893 VerificationType::reference_check(), CHECK_VERIFY(this));
894 if (!atype.is_reference_array()) {
895 verify_error(ErrorContext::bad_type(bci,
896 current_frame.stack_top_ctx(),
897 TypeOrigin::implicit(VerificationType::reference_check())),
898 bad_type_msg, "aaload");
899 return;
900 }
901 if (atype.is_null()) {
902 current_frame.push_stack(
903 VerificationType::null_type(), CHECK_VERIFY(this));
904 } else {
905 VerificationType component =
906 atype.get_component(this, CHECK_VERIFY(this));
907 current_frame.push_stack(component, CHECK_VERIFY(this));
908 }
909 no_control_flow = false; break;
910 }
911 case Bytecodes::_istore :
912 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
913 no_control_flow = false; break;
914 case Bytecodes::_istore_0 :
915 case Bytecodes::_istore_1 :
916 case Bytecodes::_istore_2 :
917 case Bytecodes::_istore_3 :
918 index = opcode - Bytecodes::_istore_0;
919 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
920 no_control_flow = false; break;
921 case Bytecodes::_lstore :
922 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
923 no_control_flow = false; break;
924 case Bytecodes::_lstore_0 :
925 case Bytecodes::_lstore_1 :
926 case Bytecodes::_lstore_2 :
927 case Bytecodes::_lstore_3 :
928 index = opcode - Bytecodes::_lstore_0;
929 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
930 no_control_flow = false; break;
931 case Bytecodes::_fstore :
932 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
933 no_control_flow = false; break;
934 case Bytecodes::_fstore_0 :
935 case Bytecodes::_fstore_1 :
936 case Bytecodes::_fstore_2 :
937 case Bytecodes::_fstore_3 :
938 index = opcode - Bytecodes::_fstore_0;
939 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
940 no_control_flow = false; break;
941 case Bytecodes::_dstore :
942 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
943 no_control_flow = false; break;
944 case Bytecodes::_dstore_0 :
945 case Bytecodes::_dstore_1 :
946 case Bytecodes::_dstore_2 :
947 case Bytecodes::_dstore_3 :
948 index = opcode - Bytecodes::_dstore_0;
949 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
950 no_control_flow = false; break;
951 case Bytecodes::_astore :
952 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
953 no_control_flow = false; break;
954 case Bytecodes::_astore_0 :
955 case Bytecodes::_astore_1 :
956 case Bytecodes::_astore_2 :
957 case Bytecodes::_astore_3 :
958 index = opcode - Bytecodes::_astore_0;
959 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
960 no_control_flow = false; break;
961 case Bytecodes::_iastore :
962 type = current_frame.pop_stack(
963 VerificationType::integer_type(), CHECK_VERIFY(this));
964 type2 = current_frame.pop_stack(
965 VerificationType::integer_type(), CHECK_VERIFY(this));
966 atype = current_frame.pop_stack(
967 VerificationType::reference_check(), CHECK_VERIFY(this));
968 if (!atype.is_int_array()) {
969 verify_error(ErrorContext::bad_type(bci,
970 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
971 bad_type_msg, "iastore");
972 return;
973 }
974 no_control_flow = false; break;
975 case Bytecodes::_bastore :
976 type = current_frame.pop_stack(
977 VerificationType::integer_type(), CHECK_VERIFY(this));
978 type2 = current_frame.pop_stack(
979 VerificationType::integer_type(), CHECK_VERIFY(this));
980 atype = current_frame.pop_stack(
981 VerificationType::reference_check(), CHECK_VERIFY(this));
982 if (!atype.is_bool_array() && !atype.is_byte_array()) {
983 verify_error(
984 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
985 bad_type_msg, "bastore");
986 return;
987 }
988 no_control_flow = false; break;
989 case Bytecodes::_castore :
990 current_frame.pop_stack(
991 VerificationType::integer_type(), CHECK_VERIFY(this));
992 current_frame.pop_stack(
993 VerificationType::integer_type(), CHECK_VERIFY(this));
994 atype = current_frame.pop_stack(
995 VerificationType::reference_check(), CHECK_VERIFY(this));
996 if (!atype.is_char_array()) {
997 verify_error(ErrorContext::bad_type(bci,
998 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
999 bad_type_msg, "castore");
1000 return;
1001 }
1002 no_control_flow = false; break;
1003 case Bytecodes::_sastore :
1004 current_frame.pop_stack(
1005 VerificationType::integer_type(), CHECK_VERIFY(this));
1006 current_frame.pop_stack(
1007 VerificationType::integer_type(), CHECK_VERIFY(this));
1008 atype = current_frame.pop_stack(
1009 VerificationType::reference_check(), CHECK_VERIFY(this));
1010 if (!atype.is_short_array()) {
1011 verify_error(ErrorContext::bad_type(bci,
1012 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1013 bad_type_msg, "sastore");
1014 return;
1015 }
1016 no_control_flow = false; break;
1017 case Bytecodes::_lastore :
1018 current_frame.pop_stack_2(
1019 VerificationType::long2_type(),
1020 VerificationType::long_type(), CHECK_VERIFY(this));
1021 current_frame.pop_stack(
1022 VerificationType::integer_type(), CHECK_VERIFY(this));
1023 atype = current_frame.pop_stack(
1024 VerificationType::reference_check(), CHECK_VERIFY(this));
1025 if (!atype.is_long_array()) {
1026 verify_error(ErrorContext::bad_type(bci,
1027 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1028 bad_type_msg, "lastore");
1029 return;
1030 }
1031 no_control_flow = false; break;
1032 case Bytecodes::_fastore :
1033 current_frame.pop_stack(
1034 VerificationType::float_type(), CHECK_VERIFY(this));
1035 current_frame.pop_stack
1036 (VerificationType::integer_type(), CHECK_VERIFY(this));
1037 atype = current_frame.pop_stack(
1038 VerificationType::reference_check(), CHECK_VERIFY(this));
1039 if (!atype.is_float_array()) {
1040 verify_error(ErrorContext::bad_type(bci,
1041 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1042 bad_type_msg, "fastore");
1043 return;
1044 }
1045 no_control_flow = false; break;
1046 case Bytecodes::_dastore :
1047 current_frame.pop_stack_2(
1048 VerificationType::double2_type(),
1049 VerificationType::double_type(), CHECK_VERIFY(this));
1050 current_frame.pop_stack(
1051 VerificationType::integer_type(), CHECK_VERIFY(this));
1052 atype = current_frame.pop_stack(
1053 VerificationType::reference_check(), CHECK_VERIFY(this));
1054 if (!atype.is_double_array()) {
1055 verify_error(ErrorContext::bad_type(bci,
1056 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1057 bad_type_msg, "dastore");
1058 return;
1059 }
1060 no_control_flow = false; break;
1061 case Bytecodes::_aastore :
1062 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1063 type2 = current_frame.pop_stack(
1064 VerificationType::integer_type(), CHECK_VERIFY(this));
1065 atype = current_frame.pop_stack(
1066 VerificationType::reference_check(), CHECK_VERIFY(this));
1067 // more type-checking is done at runtime
1068 if (!atype.is_reference_array()) {
1069 verify_error(ErrorContext::bad_type(bci,
1070 current_frame.stack_top_ctx(),
1071 TypeOrigin::implicit(VerificationType::reference_check())),
1072 bad_type_msg, "aastore");
1073 return;
1074 }
1075 // 4938384: relaxed constraint in JVMS 3nd edition.
1076 no_control_flow = false; break;
1077 case Bytecodes::_pop :
1078 current_frame.pop_stack(
1079 VerificationType::category1_check(), CHECK_VERIFY(this));
1080 no_control_flow = false; break;
1081 case Bytecodes::_pop2 :
1082 type = current_frame.pop_stack(CHECK_VERIFY(this));
1083 if (type.is_category1()) {
1084 current_frame.pop_stack(
1085 VerificationType::category1_check(), CHECK_VERIFY(this));
1086 } else if (type.is_category2_2nd()) {
1087 current_frame.pop_stack(
1088 VerificationType::category2_check(), CHECK_VERIFY(this));
1089 } else {
1090 /* Unreachable? Would need a category2_1st on TOS
1091 * which does not appear possible. */
1092 verify_error(
1093 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1094 bad_type_msg, "pop2");
1095 return;
1096 }
1097 no_control_flow = false; break;
1098 case Bytecodes::_dup :
1099 type = current_frame.pop_stack(
1100 VerificationType::category1_check(), CHECK_VERIFY(this));
1101 current_frame.push_stack(type, CHECK_VERIFY(this));
1102 current_frame.push_stack(type, CHECK_VERIFY(this));
1103 no_control_flow = false; break;
1104 case Bytecodes::_dup_x1 :
1105 type = current_frame.pop_stack(
1106 VerificationType::category1_check(), CHECK_VERIFY(this));
1107 type2 = current_frame.pop_stack(
1108 VerificationType::category1_check(), CHECK_VERIFY(this));
1109 current_frame.push_stack(type, CHECK_VERIFY(this));
1110 current_frame.push_stack(type2, CHECK_VERIFY(this));
1111 current_frame.push_stack(type, CHECK_VERIFY(this));
1112 no_control_flow = false; break;
1113 case Bytecodes::_dup_x2 :
1114 {
1115 VerificationType type3;
1116 type = current_frame.pop_stack(
1117 VerificationType::category1_check(), CHECK_VERIFY(this));
1118 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1119 if (type2.is_category1()) {
1120 type3 = current_frame.pop_stack(
1121 VerificationType::category1_check(), CHECK_VERIFY(this));
1122 } else if (type2.is_category2_2nd()) {
1123 type3 = current_frame.pop_stack(
1124 VerificationType::category2_check(), CHECK_VERIFY(this));
1125 } else {
1126 /* Unreachable? Would need a category2_1st at stack depth 2 with
1127 * a category1 on TOS which does not appear possible. */
1128 verify_error(ErrorContext::bad_type(
1129 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1130 return;
1131 }
1132 current_frame.push_stack(type, CHECK_VERIFY(this));
1133 current_frame.push_stack(type3, CHECK_VERIFY(this));
1134 current_frame.push_stack(type2, CHECK_VERIFY(this));
1135 current_frame.push_stack(type, CHECK_VERIFY(this));
1136 no_control_flow = false; break;
1137 }
1138 case Bytecodes::_dup2 :
1139 type = current_frame.pop_stack(CHECK_VERIFY(this));
1140 if (type.is_category1()) {
1141 type2 = current_frame.pop_stack(
1142 VerificationType::category1_check(), CHECK_VERIFY(this));
1143 } else if (type.is_category2_2nd()) {
1144 type2 = current_frame.pop_stack(
1145 VerificationType::category2_check(), CHECK_VERIFY(this));
1146 } else {
1147 /* Unreachable? Would need a category2_1st on TOS which does not
1148 * appear possible. */
1149 verify_error(
1150 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1151 bad_type_msg, "dup2");
1152 return;
1153 }
1154 current_frame.push_stack(type2, CHECK_VERIFY(this));
1155 current_frame.push_stack(type, CHECK_VERIFY(this));
1156 current_frame.push_stack(type2, CHECK_VERIFY(this));
1157 current_frame.push_stack(type, CHECK_VERIFY(this));
1158 no_control_flow = false; break;
1159 case Bytecodes::_dup2_x1 :
1160 {
1161 VerificationType type3;
1162 type = current_frame.pop_stack(CHECK_VERIFY(this));
1163 if (type.is_category1()) {
1164 type2 = current_frame.pop_stack(
1165 VerificationType::category1_check(), CHECK_VERIFY(this));
1166 } else if (type.is_category2_2nd()) {
1167 type2 = current_frame.pop_stack(
1168 VerificationType::category2_check(), CHECK_VERIFY(this));
1169 } else {
1170 /* Unreachable? Would need a category2_1st on TOS which does
1171 * not appear possible. */
1172 verify_error(
1173 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1174 bad_type_msg, "dup2_x1");
1175 return;
1176 }
1177 type3 = current_frame.pop_stack(
1178 VerificationType::category1_check(), CHECK_VERIFY(this));
1179 current_frame.push_stack(type2, CHECK_VERIFY(this));
1180 current_frame.push_stack(type, CHECK_VERIFY(this));
1181 current_frame.push_stack(type3, CHECK_VERIFY(this));
1182 current_frame.push_stack(type2, CHECK_VERIFY(this));
1183 current_frame.push_stack(type, CHECK_VERIFY(this));
1184 no_control_flow = false; break;
1185 }
1186 case Bytecodes::_dup2_x2 :
1187 {
1188 VerificationType type3, type4;
1189 type = current_frame.pop_stack(CHECK_VERIFY(this));
1190 if (type.is_category1()) {
1191 type2 = current_frame.pop_stack(
1192 VerificationType::category1_check(), CHECK_VERIFY(this));
1193 } else if (type.is_category2_2nd()) {
1194 type2 = current_frame.pop_stack(
1195 VerificationType::category2_check(), CHECK_VERIFY(this));
1196 } else {
1197 /* Unreachable? Would need a category2_1st on TOS which does
1198 * not appear possible. */
1199 verify_error(
1200 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1201 bad_type_msg, "dup2_x2");
1202 return;
1203 }
1204 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1205 if (type3.is_category1()) {
1206 type4 = current_frame.pop_stack(
1207 VerificationType::category1_check(), CHECK_VERIFY(this));
1208 } else if (type3.is_category2_2nd()) {
1209 type4 = current_frame.pop_stack(
1210 VerificationType::category2_check(), CHECK_VERIFY(this));
1211 } else {
1212 /* Unreachable? Would need a category2_1st on TOS after popping
1213 * a long/double or two category 1's, which does not
1214 * appear possible. */
1215 verify_error(
1216 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1217 bad_type_msg, "dup2_x2");
1218 return;
1219 }
1220 current_frame.push_stack(type2, CHECK_VERIFY(this));
1221 current_frame.push_stack(type, CHECK_VERIFY(this));
1222 current_frame.push_stack(type4, CHECK_VERIFY(this));
1223 current_frame.push_stack(type3, CHECK_VERIFY(this));
1224 current_frame.push_stack(type2, CHECK_VERIFY(this));
1225 current_frame.push_stack(type, CHECK_VERIFY(this));
1226 no_control_flow = false; break;
1227 }
1228 case Bytecodes::_swap :
1229 type = current_frame.pop_stack(
1230 VerificationType::category1_check(), CHECK_VERIFY(this));
1231 type2 = current_frame.pop_stack(
1232 VerificationType::category1_check(), CHECK_VERIFY(this));
1233 current_frame.push_stack(type, CHECK_VERIFY(this));
1234 current_frame.push_stack(type2, CHECK_VERIFY(this));
1235 no_control_flow = false; break;
1236 case Bytecodes::_iadd :
1237 case Bytecodes::_isub :
1238 case Bytecodes::_imul :
1239 case Bytecodes::_idiv :
1240 case Bytecodes::_irem :
1241 case Bytecodes::_ishl :
1242 case Bytecodes::_ishr :
1243 case Bytecodes::_iushr :
1244 case Bytecodes::_ior :
1245 case Bytecodes::_ixor :
1246 case Bytecodes::_iand :
1247 current_frame.pop_stack(
1248 VerificationType::integer_type(), CHECK_VERIFY(this));
1249 // fall through
1250 case Bytecodes::_ineg :
1251 current_frame.pop_stack(
1252 VerificationType::integer_type(), CHECK_VERIFY(this));
1253 current_frame.push_stack(
1254 VerificationType::integer_type(), CHECK_VERIFY(this));
1255 no_control_flow = false; break;
1256 case Bytecodes::_ladd :
1257 case Bytecodes::_lsub :
1258 case Bytecodes::_lmul :
1259 case Bytecodes::_ldiv :
1260 case Bytecodes::_lrem :
1261 case Bytecodes::_land :
1262 case Bytecodes::_lor :
1263 case Bytecodes::_lxor :
1264 current_frame.pop_stack_2(
1265 VerificationType::long2_type(),
1266 VerificationType::long_type(), CHECK_VERIFY(this));
1267 // fall through
1268 case Bytecodes::_lneg :
1269 current_frame.pop_stack_2(
1270 VerificationType::long2_type(),
1271 VerificationType::long_type(), CHECK_VERIFY(this));
1272 current_frame.push_stack_2(
1273 VerificationType::long_type(),
1274 VerificationType::long2_type(), CHECK_VERIFY(this));
1275 no_control_flow = false; break;
1276 case Bytecodes::_lshl :
1277 case Bytecodes::_lshr :
1278 case Bytecodes::_lushr :
1279 current_frame.pop_stack(
1280 VerificationType::integer_type(), CHECK_VERIFY(this));
1281 current_frame.pop_stack_2(
1282 VerificationType::long2_type(),
1283 VerificationType::long_type(), CHECK_VERIFY(this));
1284 current_frame.push_stack_2(
1285 VerificationType::long_type(),
1286 VerificationType::long2_type(), CHECK_VERIFY(this));
1287 no_control_flow = false; break;
1288 case Bytecodes::_fadd :
1289 case Bytecodes::_fsub :
1290 case Bytecodes::_fmul :
1291 case Bytecodes::_fdiv :
1292 case Bytecodes::_frem :
1293 current_frame.pop_stack(
1294 VerificationType::float_type(), CHECK_VERIFY(this));
1295 // fall through
1296 case Bytecodes::_fneg :
1297 current_frame.pop_stack(
1298 VerificationType::float_type(), CHECK_VERIFY(this));
1299 current_frame.push_stack(
1300 VerificationType::float_type(), CHECK_VERIFY(this));
1301 no_control_flow = false; break;
1302 case Bytecodes::_dadd :
1303 case Bytecodes::_dsub :
1304 case Bytecodes::_dmul :
1305 case Bytecodes::_ddiv :
1306 case Bytecodes::_drem :
1307 current_frame.pop_stack_2(
1308 VerificationType::double2_type(),
1309 VerificationType::double_type(), CHECK_VERIFY(this));
1310 // fall through
1311 case Bytecodes::_dneg :
1312 current_frame.pop_stack_2(
1313 VerificationType::double2_type(),
1314 VerificationType::double_type(), CHECK_VERIFY(this));
1315 current_frame.push_stack_2(
1316 VerificationType::double_type(),
1317 VerificationType::double2_type(), CHECK_VERIFY(this));
1318 no_control_flow = false; break;
1319 case Bytecodes::_iinc :
1320 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1321 no_control_flow = false; break;
1322 case Bytecodes::_i2l :
1323 type = current_frame.pop_stack(
1324 VerificationType::integer_type(), CHECK_VERIFY(this));
1325 current_frame.push_stack_2(
1326 VerificationType::long_type(),
1327 VerificationType::long2_type(), CHECK_VERIFY(this));
1328 no_control_flow = false; break;
1329 case Bytecodes::_l2i :
1330 current_frame.pop_stack_2(
1331 VerificationType::long2_type(),
1332 VerificationType::long_type(), CHECK_VERIFY(this));
1333 current_frame.push_stack(
1334 VerificationType::integer_type(), CHECK_VERIFY(this));
1335 no_control_flow = false; break;
1336 case Bytecodes::_i2f :
1337 current_frame.pop_stack(
1338 VerificationType::integer_type(), CHECK_VERIFY(this));
1339 current_frame.push_stack(
1340 VerificationType::float_type(), CHECK_VERIFY(this));
1341 no_control_flow = false; break;
1342 case Bytecodes::_i2d :
1343 current_frame.pop_stack(
1344 VerificationType::integer_type(), CHECK_VERIFY(this));
1345 current_frame.push_stack_2(
1346 VerificationType::double_type(),
1347 VerificationType::double2_type(), CHECK_VERIFY(this));
1348 no_control_flow = false; break;
1349 case Bytecodes::_l2f :
1350 current_frame.pop_stack_2(
1351 VerificationType::long2_type(),
1352 VerificationType::long_type(), CHECK_VERIFY(this));
1353 current_frame.push_stack(
1354 VerificationType::float_type(), CHECK_VERIFY(this));
1355 no_control_flow = false; break;
1356 case Bytecodes::_l2d :
1357 current_frame.pop_stack_2(
1358 VerificationType::long2_type(),
1359 VerificationType::long_type(), CHECK_VERIFY(this));
1360 current_frame.push_stack_2(
1361 VerificationType::double_type(),
1362 VerificationType::double2_type(), CHECK_VERIFY(this));
1363 no_control_flow = false; break;
1364 case Bytecodes::_f2i :
1365 current_frame.pop_stack(
1366 VerificationType::float_type(), CHECK_VERIFY(this));
1367 current_frame.push_stack(
1368 VerificationType::integer_type(), CHECK_VERIFY(this));
1369 no_control_flow = false; break;
1370 case Bytecodes::_f2l :
1371 current_frame.pop_stack(
1372 VerificationType::float_type(), CHECK_VERIFY(this));
1373 current_frame.push_stack_2(
1374 VerificationType::long_type(),
1375 VerificationType::long2_type(), CHECK_VERIFY(this));
1376 no_control_flow = false; break;
1377 case Bytecodes::_f2d :
1378 current_frame.pop_stack(
1379 VerificationType::float_type(), CHECK_VERIFY(this));
1380 current_frame.push_stack_2(
1381 VerificationType::double_type(),
1382 VerificationType::double2_type(), CHECK_VERIFY(this));
1383 no_control_flow = false; break;
1384 case Bytecodes::_d2i :
1385 current_frame.pop_stack_2(
1386 VerificationType::double2_type(),
1387 VerificationType::double_type(), CHECK_VERIFY(this));
1388 current_frame.push_stack(
1389 VerificationType::integer_type(), CHECK_VERIFY(this));
1390 no_control_flow = false; break;
1391 case Bytecodes::_d2l :
1392 current_frame.pop_stack_2(
1393 VerificationType::double2_type(),
1394 VerificationType::double_type(), CHECK_VERIFY(this));
1395 current_frame.push_stack_2(
1396 VerificationType::long_type(),
1397 VerificationType::long2_type(), CHECK_VERIFY(this));
1398 no_control_flow = false; break;
1399 case Bytecodes::_d2f :
1400 current_frame.pop_stack_2(
1401 VerificationType::double2_type(),
1402 VerificationType::double_type(), CHECK_VERIFY(this));
1403 current_frame.push_stack(
1404 VerificationType::float_type(), CHECK_VERIFY(this));
1405 no_control_flow = false; break;
1406 case Bytecodes::_i2b :
1407 case Bytecodes::_i2c :
1408 case Bytecodes::_i2s :
1409 current_frame.pop_stack(
1410 VerificationType::integer_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::_lcmp :
1415 current_frame.pop_stack_2(
1416 VerificationType::long2_type(),
1417 VerificationType::long_type(), CHECK_VERIFY(this));
1418 current_frame.pop_stack_2(
1419 VerificationType::long2_type(),
1420 VerificationType::long_type(), CHECK_VERIFY(this));
1421 current_frame.push_stack(
1422 VerificationType::integer_type(), CHECK_VERIFY(this));
1423 no_control_flow = false; break;
1424 case Bytecodes::_fcmpl :
1425 case Bytecodes::_fcmpg :
1426 current_frame.pop_stack(
1427 VerificationType::float_type(), CHECK_VERIFY(this));
1428 current_frame.pop_stack(
1429 VerificationType::float_type(), CHECK_VERIFY(this));
1430 current_frame.push_stack(
1431 VerificationType::integer_type(), CHECK_VERIFY(this));
1432 no_control_flow = false; break;
1433 case Bytecodes::_dcmpl :
1434 case Bytecodes::_dcmpg :
1435 current_frame.pop_stack_2(
1436 VerificationType::double2_type(),
1437 VerificationType::double_type(), CHECK_VERIFY(this));
1438 current_frame.pop_stack_2(
1439 VerificationType::double2_type(),
1440 VerificationType::double_type(), CHECK_VERIFY(this));
1441 current_frame.push_stack(
1442 VerificationType::integer_type(), CHECK_VERIFY(this));
1443 no_control_flow = false; break;
1444 case Bytecodes::_if_icmpeq:
1445 case Bytecodes::_if_icmpne:
1446 case Bytecodes::_if_icmplt:
1447 case Bytecodes::_if_icmpge:
1448 case Bytecodes::_if_icmpgt:
1449 case Bytecodes::_if_icmple:
1450 current_frame.pop_stack(
1451 VerificationType::integer_type(), CHECK_VERIFY(this));
1452 // fall through
1453 case Bytecodes::_ifeq:
1454 case Bytecodes::_ifne:
1455 case Bytecodes::_iflt:
1456 case Bytecodes::_ifge:
1457 case Bytecodes::_ifgt:
1458 case Bytecodes::_ifle:
1459 current_frame.pop_stack(
1460 VerificationType::integer_type(), CHECK_VERIFY(this));
1461 target = bcs.dest();
1462 stackmap_table.check_jump_target(
1463 ¤t_frame, target, CHECK_VERIFY(this));
1464 no_control_flow = false; break;
1465 case Bytecodes::_if_acmpeq :
1466 case Bytecodes::_if_acmpne :
1467 current_frame.pop_stack(
1468 VerificationType::reference_check(), CHECK_VERIFY(this));
1469 // fall through
1470 case Bytecodes::_ifnull :
1471 case Bytecodes::_ifnonnull :
1472 current_frame.pop_stack(
1473 VerificationType::reference_check(), CHECK_VERIFY(this));
1474 target = bcs.dest();
1475 stackmap_table.check_jump_target
1476 (¤t_frame, target, CHECK_VERIFY(this));
1477 no_control_flow = false; break;
1478 case Bytecodes::_goto :
1479 target = bcs.dest();
1480 stackmap_table.check_jump_target(
1481 ¤t_frame, target, CHECK_VERIFY(this));
1482 no_control_flow = true; break;
1483 case Bytecodes::_goto_w :
1484 target = bcs.dest_w();
1485 stackmap_table.check_jump_target(
1486 ¤t_frame, target, CHECK_VERIFY(this));
1487 no_control_flow = true; break;
1488 case Bytecodes::_tableswitch :
1489 case Bytecodes::_lookupswitch :
1490 verify_switch(
1491 &bcs, code_length, code_data, ¤t_frame,
1492 &stackmap_table, CHECK_VERIFY(this));
1493 no_control_flow = true; break;
1494 case Bytecodes::_ireturn :
1495 type = current_frame.pop_stack(
1496 VerificationType::integer_type(), CHECK_VERIFY(this));
1497 verify_return_value(return_type, type, bci,
1498 ¤t_frame, CHECK_VERIFY(this));
1499 no_control_flow = true; break;
1500 case Bytecodes::_lreturn :
1501 type2 = current_frame.pop_stack(
1502 VerificationType::long2_type(), CHECK_VERIFY(this));
1503 type = current_frame.pop_stack(
1504 VerificationType::long_type(), CHECK_VERIFY(this));
1505 verify_return_value(return_type, type, bci,
1506 ¤t_frame, CHECK_VERIFY(this));
1507 no_control_flow = true; break;
1508 case Bytecodes::_freturn :
1509 type = current_frame.pop_stack(
1510 VerificationType::float_type(), CHECK_VERIFY(this));
1511 verify_return_value(return_type, type, bci,
1512 ¤t_frame, CHECK_VERIFY(this));
1513 no_control_flow = true; break;
1514 case Bytecodes::_dreturn :
1515 type2 = current_frame.pop_stack(
1516 VerificationType::double2_type(), CHECK_VERIFY(this));
1517 type = current_frame.pop_stack(
1518 VerificationType::double_type(), CHECK_VERIFY(this));
1519 verify_return_value(return_type, type, bci,
1520 ¤t_frame, CHECK_VERIFY(this));
1521 no_control_flow = true; break;
1522 case Bytecodes::_areturn :
1523 type = current_frame.pop_stack(
1524 VerificationType::reference_check(), CHECK_VERIFY(this));
1525 verify_return_value(return_type, type, bci,
1526 ¤t_frame, CHECK_VERIFY(this));
1527 no_control_flow = true; break;
1528 case Bytecodes::_return :
1529 if (return_type != VerificationType::bogus_type()) {
1530 verify_error(ErrorContext::bad_code(bci),
1531 "Method expects a return value");
1532 return;
1533 }
1534 // Make sure "this" has been initialized if current method is an
1535 // <init>
1536 if (_method->name() == vmSymbols::object_initializer_name() &&
1537 current_frame.flag_this_uninit()) {
1538 verify_error(ErrorContext::bad_code(bci),
1539 "Constructor must call super() or this() "
1540 "before return");
1541 return;
1542 }
1543 no_control_flow = true; break;
1544 case Bytecodes::_getstatic :
1545 case Bytecodes::_putstatic :
1546 case Bytecodes::_getfield :
1547 case Bytecodes::_putfield :
1548 verify_field_instructions(
1549 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1550 no_control_flow = false; break;
1551 case Bytecodes::_invokevirtual :
1552 case Bytecodes::_invokespecial :
1553 case Bytecodes::_invokestatic :
1554 verify_invoke_instructions(
1555 &bcs, code_length, ¤t_frame,
1556 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1557 no_control_flow = false; break;
1558 case Bytecodes::_invokeinterface :
1559 case Bytecodes::_invokedynamic :
1560 verify_invoke_instructions(
1561 &bcs, code_length, ¤t_frame,
1562 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1563 no_control_flow = false; break;
1564 case Bytecodes::_new :
1565 {
1566 index = bcs.get_index_u2();
1567 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1568 VerificationType new_class_type =
1569 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1570 if (!new_class_type.is_object()) {
1571 verify_error(ErrorContext::bad_type(bci,
1572 TypeOrigin::cp(index, new_class_type)),
1573 "Illegal new instruction");
1574 return;
1575 }
1576 type = VerificationType::uninitialized_type(bci);
1577 current_frame.push_stack(type, CHECK_VERIFY(this));
1578 no_control_flow = false; break;
1579 }
1580 case Bytecodes::_newarray :
1581 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1582 current_frame.pop_stack(
1583 VerificationType::integer_type(), CHECK_VERIFY(this));
1584 current_frame.push_stack(type, CHECK_VERIFY(this));
1585 no_control_flow = false; break;
1586 case Bytecodes::_anewarray :
1587 verify_anewarray(
1588 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1589 no_control_flow = false; break;
1590 case Bytecodes::_arraylength :
1591 type = current_frame.pop_stack(
1592 VerificationType::reference_check(), CHECK_VERIFY(this));
1593 if (!(type.is_null() || type.is_array())) {
1594 verify_error(ErrorContext::bad_type(
1595 bci, current_frame.stack_top_ctx()),
1596 bad_type_msg, "arraylength");
1597 }
1598 current_frame.push_stack(
1599 VerificationType::integer_type(), CHECK_VERIFY(this));
1600 no_control_flow = false; break;
1601 case Bytecodes::_checkcast :
1602 {
1603 index = bcs.get_index_u2();
1604 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1605 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1606 VerificationType klass_type = cp_index_to_type(
1607 index, cp, CHECK_VERIFY(this));
1608 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1609 no_control_flow = false; break;
1610 }
1611 case Bytecodes::_instanceof : {
1612 index = bcs.get_index_u2();
1613 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1614 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1615 current_frame.push_stack(
1616 VerificationType::integer_type(), CHECK_VERIFY(this));
1617 no_control_flow = false; break;
1618 }
1619 case Bytecodes::_monitorenter :
1620 case Bytecodes::_monitorexit :
1621 current_frame.pop_stack(
1622 VerificationType::reference_check(), CHECK_VERIFY(this));
1623 no_control_flow = false; break;
1624 case Bytecodes::_multianewarray :
1625 {
1626 index = bcs.get_index_u2();
1627 u2 dim = *(bcs.bcp()+3);
1628 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1629 VerificationType new_array_type =
1630 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1631 if (!new_array_type.is_array()) {
1632 verify_error(ErrorContext::bad_type(bci,
1633 TypeOrigin::cp(index, new_array_type)),
1634 "Illegal constant pool index in multianewarray instruction");
1635 return;
1636 }
1637 if (dim < 1 || new_array_type.dimensions() < dim) {
1638 verify_error(ErrorContext::bad_code(bci),
1639 "Illegal dimension in multianewarray instruction: %d", dim);
1640 return;
1641 }
1642 for (int i = 0; i < dim; i++) {
1643 current_frame.pop_stack(
1644 VerificationType::integer_type(), CHECK_VERIFY(this));
1645 }
1646 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1647 no_control_flow = false; break;
1648 }
1649 case Bytecodes::_athrow :
1650 type = VerificationType::reference_type(
1651 vmSymbols::java_lang_Throwable());
1652 current_frame.pop_stack(type, CHECK_VERIFY(this));
1653 no_control_flow = true; break;
1654 default:
1655 // We only need to check the valid bytecodes in class file.
1656 // And jsr and ret are not in the new class file format in JDK1.5.
1657 verify_error(ErrorContext::bad_code(bci),
1658 "Bad instruction: %02x", opcode);
1659 no_control_flow = false;
1660 return;
1661 } // end switch
1662 } // end Merge with the next instruction
1663
1664 // Look for possible jump target in exception handlers and see if it
1665 // matches current_frame
1666 if (bci >= ex_min && bci < ex_max) {
1667 verify_exception_handler_targets(
1668 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1669 }
1670 } // end while
1671
1672 // Make sure that control flow does not fall through end of the method
1673 if (!no_control_flow) {
1674 verify_error(ErrorContext::bad_code(code_length),
1675 "Control flow falls through code end");
1676 return;
1677 }
1678 }
1679
1680 #undef bad_type_message
1681
1682 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1683 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1684 memset(code_data, 0, sizeof(char) * code_length);
1685 RawBytecodeStream bcs(m);
1686
1687 while (!bcs.is_last_bytecode()) {
1688 if (bcs.raw_next() != Bytecodes::_illegal) {
1689 int bci = bcs.bci();
1690 if (bcs.raw_code() == Bytecodes::_new) {
1691 code_data[bci] = NEW_OFFSET;
1692 } else {
1693 code_data[bci] = BYTECODE_OFFSET;
1694 }
1695 } else {
1696 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1697 return NULL;
1698 }
1699 }
1700
1701 return code_data;
1702 }
1703
1704 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1705 ExceptionTable exhandlers(_method());
1706 int exlength = exhandlers.length();
1707 constantPoolHandle cp (THREAD, _method->constants());
1708
1709 for(int i = 0; i < exlength; i++) {
1710 //reacquire the table in case a GC happened
1711 ExceptionTable exhandlers(_method());
1712 u2 start_pc = exhandlers.start_pc(i);
1713 u2 end_pc = exhandlers.end_pc(i);
1714 u2 handler_pc = exhandlers.handler_pc(i);
1715 if (start_pc >= code_length || code_data[start_pc] == 0) {
1716 class_format_error("Illegal exception table start_pc %d", start_pc);
1717 return;
1718 }
1719 if (end_pc != code_length) { // special case: end_pc == code_length
1720 if (end_pc > code_length || code_data[end_pc] == 0) {
1721 class_format_error("Illegal exception table end_pc %d", end_pc);
1722 return;
1723 }
1724 }
1725 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1726 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1727 return;
1728 }
1729 int catch_type_index = exhandlers.catch_type_index(i);
1730 if (catch_type_index != 0) {
1731 VerificationType catch_type = cp_index_to_type(
1732 catch_type_index, cp, CHECK_VERIFY(this));
1733 VerificationType throwable =
1734 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1735 bool is_subclass = throwable.is_assignable_from(
1736 catch_type, this, CHECK_VERIFY(this));
1737 if (!is_subclass) {
1738 // 4286534: should throw VerifyError according to recent spec change
1739 verify_error(ErrorContext::bad_type(handler_pc,
1740 TypeOrigin::cp(catch_type_index, catch_type),
1741 TypeOrigin::implicit(throwable)),
1742 "Catch type is not a subclass "
1743 "of Throwable in exception handler %d", handler_pc);
1744 return;
1745 }
1746 }
1747 if (start_pc < min) min = start_pc;
1748 if (end_pc > max) max = end_pc;
1749 }
1750 }
1751
1752 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1753 int localvariable_table_length = _method()->localvariable_table_length();
1754 if (localvariable_table_length > 0) {
1755 LocalVariableTableElement* table = _method()->localvariable_table_start();
1756 for (int i = 0; i < localvariable_table_length; i++) {
1757 u2 start_bci = table[i].start_bci;
1758 u2 length = table[i].length;
1759
1760 if (start_bci >= code_length || code_data[start_bci] == 0) {
1761 class_format_error(
1762 "Illegal local variable table start_pc %d", start_bci);
1763 return;
1764 }
1765 u4 end_bci = (u4)(start_bci + length);
1766 if (end_bci != code_length) {
1767 if (end_bci >= code_length || code_data[end_bci] == 0) {
1768 class_format_error( "Illegal local variable table length %d", length);
1769 return;
1770 }
1771 }
1772 }
1773 }
1774 }
1775
1776 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1777 StackMapFrame* current_frame,
1778 StackMapTable* stackmap_table,
1779 bool no_control_flow, TRAPS) {
1780 if (stackmap_index < stackmap_table->get_frame_count()) {
1781 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1782 if (no_control_flow && this_offset > bci) {
1783 verify_error(ErrorContext::missing_stackmap(bci),
1784 "Expecting a stack map frame");
1785 return 0;
1786 }
1787 if (this_offset == bci) {
1788 ErrorContext ctx;
1789 // See if current stack map can be assigned to the frame in table.
1790 // current_frame is the stackmap frame got from the last instruction.
1791 // If matched, current_frame will be updated by this method.
1792 bool matches = stackmap_table->match_stackmap(
1793 current_frame, this_offset, stackmap_index,
1794 !no_control_flow, true, &ctx, CHECK_VERIFY_(this, 0));
1795 if (!matches) {
1796 // report type error
1797 verify_error(ctx, "Instruction type does not match stack map");
1798 return 0;
1799 }
1800 stackmap_index++;
1801 } else if (this_offset < bci) {
1802 // current_offset should have met this_offset.
1803 class_format_error("Bad stack map offset %d", this_offset);
1804 return 0;
1805 }
1806 } else if (no_control_flow) {
1807 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1808 return 0;
1809 }
1810 return stackmap_index;
1811 }
1812
1813 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1814 StackMapTable* stackmap_table, TRAPS) {
1815 constantPoolHandle cp (THREAD, _method->constants());
1816 ExceptionTable exhandlers(_method());
1817 int exlength = exhandlers.length();
1818 for(int i = 0; i < exlength; i++) {
1819 //reacquire the table in case a GC happened
1820 ExceptionTable exhandlers(_method());
1821 u2 start_pc = exhandlers.start_pc(i);
1822 u2 end_pc = exhandlers.end_pc(i);
1823 u2 handler_pc = exhandlers.handler_pc(i);
1824 int catch_type_index = exhandlers.catch_type_index(i);
1825 if(bci >= start_pc && bci < end_pc) {
1826 u1 flags = current_frame->flags();
1827 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1828 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1829 if (catch_type_index != 0) {
1830 // We know that this index refers to a subclass of Throwable
1831 VerificationType catch_type = cp_index_to_type(
1832 catch_type_index, cp, CHECK_VERIFY(this));
1833 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1834 } else {
1835 VerificationType throwable =
1836 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1837 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1838 }
1839 ErrorContext ctx;
1840 bool matches = stackmap_table->match_stackmap(
1841 new_frame, handler_pc, true, false, &ctx, CHECK_VERIFY(this));
1842 if (!matches) {
1843 verify_error(ctx, "Stack map does not match the one at "
1844 "exception handler %d", handler_pc);
1845 return;
1846 }
1847 }
1848 }
1849 }
1850
1851 void ClassVerifier::verify_cp_index(
1852 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1853 int nconstants = cp->length();
1854 if ((index <= 0) || (index >= nconstants)) {
1855 verify_error(ErrorContext::bad_cp_index(bci, index),
1856 "Illegal constant pool index %d in class %s",
1857 index, cp->pool_holder()->external_name());
1858 return;
1859 }
1860 }
1861
1862 void ClassVerifier::verify_cp_type(
1863 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1864
1865 // In some situations, bytecode rewriting may occur while we're verifying.
1866 // In this case, a constant pool cache exists and some indices refer to that
1867 // instead. Be sure we don't pick up such indices by accident.
1868 // We must check was_recursively_verified() before we get here.
1869 guarantee(cp->cache() == NULL, "not rewritten yet");
1870
1871 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1872 unsigned int tag = cp->tag_at(index).value();
1873 if ((types & (1 << tag)) == 0) {
1874 verify_error(ErrorContext::bad_cp_index(bci, index),
1875 "Illegal type at constant pool entry %d in class %s",
1876 index, cp->pool_holder()->external_name());
1877 return;
1878 }
1879 }
1880
1881 void ClassVerifier::verify_cp_class_type(
1882 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1883 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1884 constantTag tag = cp->tag_at(index);
1885 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1886 verify_error(ErrorContext::bad_cp_index(bci, index),
1887 "Illegal type at constant pool entry %d in class %s",
1888 index, cp->pool_holder()->external_name());
1889 return;
1890 }
1891 }
1892
1893 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1894 stringStream ss;
1895
1896 ctx.reset_frames();
1897 _exception_type = vmSymbols::java_lang_VerifyError();
1898 _error_context = ctx;
1899 va_list va;
1900 va_start(va, msg);
1901 ss.vprint(msg, va);
1902 va_end(va);
1903 _message = ss.as_string();
1904 #ifdef ASSERT
1905 ResourceMark rm;
1906 const char* exception_name = _exception_type->as_C_string();
1907 Exceptions::debug_check_abort(exception_name, NULL);
1908 #endif // ndef ASSERT
1909 }
1910
1911 void ClassVerifier::class_format_error(const char* msg, ...) {
1912 stringStream ss;
1913 _exception_type = vmSymbols::java_lang_ClassFormatError();
1914 va_list va;
1915 va_start(va, msg);
1916 ss.vprint(msg, va);
1917 va_end(va);
1918 if (!_method.is_null()) {
1919 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1920 }
1921 _message = ss.as_string();
1922 }
1923
1924 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1925 // Get current loader and protection domain first.
1926 oop loader = current_class()->class_loader();
1927 oop protection_domain = current_class()->protection_domain();
1928
1929 return SystemDictionary::resolve_or_fail(
1930 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1931 true, CHECK_NULL);
1932 }
1933
1934 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1935 Klass* target_class,
1936 Symbol* field_name,
1937 Symbol* field_sig,
1938 bool is_method) {
1939 No_Safepoint_Verifier nosafepoint;
1940
1941 // If target class isn't a super class of this class, we don't worry about this case
1942 if (!this_class->is_subclass_of(target_class)) {
1943 return false;
1944 }
1945 // Check if the specified method or field is protected
1946 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1947 fieldDescriptor fd;
1948 if (is_method) {
1949 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::normal);
1950 if (m != NULL && m->is_protected()) {
1951 if (!this_class->is_same_class_package(m->method_holder())) {
1952 return true;
1953 }
1954 }
1955 } else {
1956 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1957 if (member_klass != NULL && fd.is_protected()) {
1958 if (!this_class->is_same_class_package(member_klass)) {
1959 return true;
1960 }
1961 }
1962 }
1963 return false;
1964 }
1965
1966 void ClassVerifier::verify_ldc(
1967 int opcode, u2 index, StackMapFrame* current_frame,
1968 constantPoolHandle cp, u2 bci, TRAPS) {
1969 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1970 constantTag tag = cp->tag_at(index);
1971 unsigned int types;
1972 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1973 if (!tag.is_unresolved_klass()) {
1974 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1975 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1976 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1977 // Note: The class file parser already verified the legality of
1978 // MethodHandle and MethodType constants.
1979 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1980 }
1981 } else {
1982 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1983 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1984 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1985 }
1986 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1987 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1988 } else if (tag.is_string()) {
1989 current_frame->push_stack(
1990 VerificationType::reference_type(
1991 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1992 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1993 current_frame->push_stack(
1994 VerificationType::reference_type(
1995 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
1996 } else if (tag.is_int()) {
1997 current_frame->push_stack(
1998 VerificationType::integer_type(), CHECK_VERIFY(this));
1999 } else if (tag.is_float()) {
2000 current_frame->push_stack(
2001 VerificationType::float_type(), CHECK_VERIFY(this));
2002 } else if (tag.is_double()) {
2003 current_frame->push_stack_2(
2004 VerificationType::double_type(),
2005 VerificationType::double2_type(), CHECK_VERIFY(this));
2006 } else if (tag.is_long()) {
2007 current_frame->push_stack_2(
2008 VerificationType::long_type(),
2009 VerificationType::long2_type(), CHECK_VERIFY(this));
2010 } else if (tag.is_method_handle()) {
2011 current_frame->push_stack(
2012 VerificationType::reference_type(
2013 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2014 } else if (tag.is_method_type()) {
2015 current_frame->push_stack(
2016 VerificationType::reference_type(
2017 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2018 } else {
2019 /* Unreachable? verify_cp_type has already validated the cp type. */
2020 verify_error(
2021 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2022 return;
2023 }
2024 }
2025
2026 void ClassVerifier::verify_switch(
2027 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2028 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2029 int bci = bcs->bci();
2030 address bcp = bcs->bcp();
2031 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2032
2033 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2034 // 4639449 & 4647081: padding bytes must be 0
2035 u2 padding_offset = 1;
2036 while ((bcp + padding_offset) < aligned_bcp) {
2037 if(*(bcp + padding_offset) != 0) {
2038 verify_error(ErrorContext::bad_code(bci),
2039 "Nonzero padding byte in lookupswitch or tableswitch");
2040 return;
2041 }
2042 padding_offset++;
2043 }
2044 }
2045
2046 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2047 int keys, delta;
2048 current_frame->pop_stack(
2049 VerificationType::integer_type(), CHECK_VERIFY(this));
2050 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2051 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2052 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2053 if (low > high) {
2054 verify_error(ErrorContext::bad_code(bci),
2055 "low must be less than or equal to high in tableswitch");
2056 return;
2057 }
2058 keys = high - low + 1;
2059 if (keys < 0) {
2060 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2061 return;
2062 }
2063 delta = 1;
2064 } else {
2065 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2066 if (keys < 0) {
2067 verify_error(ErrorContext::bad_code(bci),
2068 "number of keys in lookupswitch less than 0");
2069 return;
2070 }
2071 delta = 2;
2072 // Make sure that the lookupswitch items are sorted
2073 for (int i = 0; i < (keys - 1); i++) {
2074 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2075 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2076 if (this_key >= next_key) {
2077 verify_error(ErrorContext::bad_code(bci),
2078 "Bad lookupswitch instruction");
2079 return;
2080 }
2081 }
2082 }
2083 int target = bci + default_offset;
2084 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2085 for (int i = 0; i < keys; i++) {
2086 // Because check_jump_target() may safepoint, the bytecode could have
2087 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2088 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2089 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2090 stackmap_table->check_jump_target(
2091 current_frame, target, CHECK_VERIFY(this));
2092 }
2093 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2094 }
2095
2096 bool ClassVerifier::name_in_supers(
2097 Symbol* ref_name, instanceKlassHandle current) {
2098 Klass* super = current->super();
2099 while (super != NULL) {
2100 if (super->name() == ref_name) {
2101 return true;
2102 }
2103 super = super->super();
2104 }
2105 return false;
2106 }
2107
2108 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2109 StackMapFrame* current_frame,
2110 constantPoolHandle cp,
2111 TRAPS) {
2112 u2 index = bcs->get_index_u2();
2113 verify_cp_type(bcs->bci(), index, cp,
2114 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2115
2116 // Get field name and signature
2117 Symbol* field_name = cp->name_ref_at(index);
2118 Symbol* field_sig = cp->signature_ref_at(index);
2119
2120 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2121 class_format_error(
2122 "Invalid signature for field in class %s referenced "
2123 "from constant pool index %d", _klass->external_name(), index);
2124 return;
2125 }
2126
2127 // Get referenced class type
2128 VerificationType ref_class_type = cp_ref_index_to_type(
2129 index, cp, CHECK_VERIFY(this));
2130 if (!ref_class_type.is_object()) {
2131 /* Unreachable? Class file parser verifies Fieldref contents */
2132 verify_error(ErrorContext::bad_type(bcs->bci(),
2133 TypeOrigin::cp(index, ref_class_type)),
2134 "Expecting reference to class in class %s at constant pool index %d",
2135 _klass->external_name(), index);
2136 return;
2137 }
2138 VerificationType target_class_type = ref_class_type;
2139
2140 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2141 "buffer type must match VerificationType size");
2142 uintptr_t field_type_buffer[2];
2143 VerificationType* field_type = (VerificationType*)field_type_buffer;
2144 // If we make a VerificationType[2] array directly, the compiler calls
2145 // to the c-runtime library to do the allocation instead of just
2146 // stack allocating it. Plus it would run constructors. This shows up
2147 // in performance profiles.
2148
2149 SignatureStream sig_stream(field_sig, false);
2150 VerificationType stack_object_type;
2151 int n = change_sig_to_verificationType(
2152 &sig_stream, field_type, CHECK_VERIFY(this));
2153 u2 bci = bcs->bci();
2154 bool is_assignable;
2155 switch (bcs->raw_code()) {
2156 case Bytecodes::_getstatic: {
2157 for (int i = 0; i < n; i++) {
2158 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2159 }
2160 break;
2161 }
2162 case Bytecodes::_putstatic: {
2163 for (int i = n - 1; i >= 0; i--) {
2164 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2165 }
2166 break;
2167 }
2168 case Bytecodes::_getfield: {
2169 stack_object_type = current_frame->pop_stack(
2170 target_class_type, CHECK_VERIFY(this));
2171 for (int i = 0; i < n; i++) {
2172 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2173 }
2174 goto check_protected;
2175 }
2176 case Bytecodes::_putfield: {
2177 for (int i = n - 1; i >= 0; i--) {
2178 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2179 }
2180 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2181
2182 // The JVMS 2nd edition allows field initialization before the superclass
2183 // initializer, if the field is defined within the current class.
2184 fieldDescriptor fd;
2185 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2186 target_class_type.equals(current_type()) &&
2187 _klass->find_local_field(field_name, field_sig, &fd)) {
2188 stack_object_type = current_type();
2189 }
2190 is_assignable = target_class_type.is_assignable_from(
2191 stack_object_type, this, CHECK_VERIFY(this));
2192 if (!is_assignable) {
2193 verify_error(ErrorContext::bad_type(bci,
2194 current_frame->stack_top_ctx(),
2195 TypeOrigin::cp(index, target_class_type)),
2196 "Bad type on operand stack in putfield");
2197 return;
2198 }
2199 }
2200 check_protected: {
2201 if (_this_type == stack_object_type)
2202 break; // stack_object_type must be assignable to _current_class_type
2203 Symbol* ref_class_name =
2204 cp->klass_name_at(cp->klass_ref_index_at(index));
2205 if (!name_in_supers(ref_class_name, current_class()))
2206 // stack_object_type must be assignable to _current_class_type since:
2207 // 1. stack_object_type must be assignable to ref_class.
2208 // 2. ref_class must be _current_class or a subclass of it. It can't
2209 // be a superclass of it. See revised JVMS 5.4.4.
2210 break;
2211
2212 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2213 if (is_protected_access(current_class(), ref_class_oop, field_name,
2214 field_sig, false)) {
2215 // It's protected access, check if stack object is assignable to
2216 // current class.
2217 is_assignable = current_type().is_assignable_from(
2218 stack_object_type, this, CHECK_VERIFY(this));
2219 if (!is_assignable) {
2220 verify_error(ErrorContext::bad_type(bci,
2221 current_frame->stack_top_ctx(),
2222 TypeOrigin::implicit(current_type())),
2223 "Bad access to protected data in getfield");
2224 return;
2225 }
2226 }
2227 break;
2228 }
2229 default: ShouldNotReachHere();
2230 }
2231 }
2232
2233 void ClassVerifier::verify_invoke_init(
2234 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2235 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2236 constantPoolHandle cp, TRAPS) {
2237 u2 bci = bcs->bci();
2238 VerificationType type = current_frame->pop_stack(
2239 VerificationType::reference_check(), CHECK_VERIFY(this));
2240 if (type == VerificationType::uninitialized_this_type()) {
2241 // The method must be an <init> method of this class or its superclass
2242 Klass* superk = current_class()->super();
2243 if (ref_class_type.name() != current_class()->name() &&
2244 ref_class_type.name() != superk->name()) {
2245 verify_error(ErrorContext::bad_type(bci,
2246 TypeOrigin::implicit(ref_class_type),
2247 TypeOrigin::implicit(current_type())),
2248 "Bad <init> method call");
2249 return;
2250 }
2251 current_frame->initialize_object(type, current_type());
2252 *this_uninit = true;
2253 } else if (type.is_uninitialized()) {
2254 u2 new_offset = type.bci();
2255 address new_bcp = bcs->bcp() - bci + new_offset;
2256 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2257 /* Unreachable? Stack map parsing ensures valid type and new
2258 * instructions have a valid BCI. */
2259 verify_error(ErrorContext::bad_code(new_offset),
2260 "Expecting new instruction");
2261 return;
2262 }
2263 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2264 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2265
2266 // The method must be an <init> method of the indicated class
2267 VerificationType new_class_type = cp_index_to_type(
2268 new_class_index, cp, CHECK_VERIFY(this));
2269 if (!new_class_type.equals(ref_class_type)) {
2270 verify_error(ErrorContext::bad_type(bci,
2271 TypeOrigin::cp(new_class_index, new_class_type),
2272 TypeOrigin::cp(ref_class_index, ref_class_type)),
2273 "Call to wrong <init> method");
2274 return;
2275 }
2276 // According to the VM spec, if the referent class is a superclass of the
2277 // current class, and is in a different runtime package, and the method is
2278 // protected, then the objectref must be the current class or a subclass
2279 // of the current class.
2280 VerificationType objectref_type = new_class_type;
2281 if (name_in_supers(ref_class_type.name(), current_class())) {
2282 Klass* ref_klass = load_class(
2283 ref_class_type.name(), CHECK_VERIFY(this));
2284 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2285 vmSymbols::object_initializer_name(),
2286 cp->signature_ref_at(bcs->get_index_u2()),
2287 Klass::normal);
2288 instanceKlassHandle mh(THREAD, m->method_holder());
2289 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2290 bool assignable = current_type().is_assignable_from(
2291 objectref_type, this, CHECK_VERIFY(this));
2292 if (!assignable) {
2293 verify_error(ErrorContext::bad_type(bci,
2294 TypeOrigin::cp(new_class_index, objectref_type),
2295 TypeOrigin::implicit(current_type())),
2296 "Bad access to protected <init> method");
2297 return;
2298 }
2299 }
2300 }
2301 current_frame->initialize_object(type, new_class_type);
2302 } else {
2303 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2304 "Bad operand type when invoking <init>");
2305 return;
2306 }
2307 }
2308
2309 bool ClassVerifier::is_same_or_direct_interface(
2310 instanceKlassHandle klass,
2311 VerificationType klass_type,
2312 VerificationType ref_class_type) {
2313 if (ref_class_type.equals(klass_type)) return true;
2314 Array<Klass*>* local_interfaces = klass->local_interfaces();
2315 if (local_interfaces != NULL) {
2316 for (int x = 0; x < local_interfaces->length(); x++) {
2317 Klass* k = local_interfaces->at(x);
2318 assert (k != NULL && k->is_interface(), "invalid interface");
2319 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2320 return true;
2321 }
2322 }
2323 }
2324 return false;
2325 }
2326
2327 void ClassVerifier::verify_invoke_instructions(
2328 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2329 bool *this_uninit, VerificationType return_type,
2330 constantPoolHandle cp, TRAPS) {
2331 // Make sure the constant pool item is the right type
2332 u2 index = bcs->get_index_u2();
2333 Bytecodes::Code opcode = bcs->raw_code();
2334 unsigned int types;
2335 switch (opcode) {
2336 case Bytecodes::_invokeinterface:
2337 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2338 break;
2339 case Bytecodes::_invokedynamic:
2340 types = 1 << JVM_CONSTANT_InvokeDynamic;
2341 break;
2342 case Bytecodes::_invokespecial:
2343 case Bytecodes::_invokestatic:
2344 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2345 (1 << JVM_CONSTANT_Methodref) :
2346 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2347 break;
2348 default:
2349 types = 1 << JVM_CONSTANT_Methodref;
2350 }
2351 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2352
2353 // Get method name and signature
2354 Symbol* method_name = cp->name_ref_at(index);
2355 Symbol* method_sig = cp->signature_ref_at(index);
2356
2357 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2358 class_format_error(
2359 "Invalid method signature in class %s referenced "
2360 "from constant pool index %d", _klass->external_name(), index);
2361 return;
2362 }
2363
2364 // Get referenced class type
2365 VerificationType ref_class_type;
2366 if (opcode == Bytecodes::_invokedynamic) {
2367 if (_klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2368 class_format_error(
2369 "invokedynamic instructions not supported by this class file version (%d), class %s",
2370 _klass->major_version(), _klass->external_name());
2371 return;
2372 }
2373 } else {
2374 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2375 }
2376
2377 // For a small signature length, we just allocate 128 bytes instead
2378 // of parsing the signature once to find its size.
2379 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2380 // longs/doubles to be consertive.
2381 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2382 "buffer type must match VerificationType size");
2383 uintptr_t on_stack_sig_types_buffer[128];
2384 // If we make a VerificationType[128] array directly, the compiler calls
2385 // to the c-runtime library to do the allocation instead of just
2386 // stack allocating it. Plus it would run constructors. This shows up
2387 // in performance profiles.
2388
2389 VerificationType* sig_types;
2390 int size = (method_sig->utf8_length() - 3) * 2;
2391 if (size > 128) {
2392 // Long and double occupies two slots here.
2393 ArgumentSizeComputer size_it(method_sig);
2394 size = size_it.size();
2395 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2396 } else{
2397 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2398 }
2399 SignatureStream sig_stream(method_sig);
2400 int sig_i = 0;
2401 while (!sig_stream.at_return_type()) {
2402 sig_i += change_sig_to_verificationType(
2403 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2404 sig_stream.next();
2405 }
2406 int nargs = sig_i;
2407
2408 #ifdef ASSERT
2409 {
2410 ArgumentSizeComputer size_it(method_sig);
2411 assert(nargs == size_it.size(), "Argument sizes do not match");
2412 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2413 }
2414 #endif
2415
2416 // Check instruction operands
2417 u2 bci = bcs->bci();
2418 if (opcode == Bytecodes::_invokeinterface) {
2419 address bcp = bcs->bcp();
2420 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2421 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2422 // the difference between the size of the operand stack before and after the instruction
2423 // executes.
2424 if (*(bcp+3) != (nargs+1)) {
2425 verify_error(ErrorContext::bad_code(bci),
2426 "Inconsistent args count operand in invokeinterface");
2427 return;
2428 }
2429 if (*(bcp+4) != 0) {
2430 verify_error(ErrorContext::bad_code(bci),
2431 "Fourth operand byte of invokeinterface must be zero");
2432 return;
2433 }
2434 }
2435
2436 if (opcode == Bytecodes::_invokedynamic) {
2437 address bcp = bcs->bcp();
2438 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2439 verify_error(ErrorContext::bad_code(bci),
2440 "Third and fourth operand bytes of invokedynamic must be zero");
2441 return;
2442 }
2443 }
2444
2445 if (method_name->byte_at(0) == '<') {
2446 // Make sure <init> can only be invoked by invokespecial
2447 if (opcode != Bytecodes::_invokespecial ||
2448 method_name != vmSymbols::object_initializer_name()) {
2449 verify_error(ErrorContext::bad_code(bci),
2450 "Illegal call to internal method");
2451 return;
2452 }
2453 } else if (opcode == Bytecodes::_invokespecial
2454 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2455 && !ref_class_type.equals(VerificationType::reference_type(
2456 current_class()->super()->name()))) {
2457 bool subtype = false;
2458 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2459 if (!current_class()->is_anonymous()) {
2460 subtype = ref_class_type.is_assignable_from(
2461 current_type(), this, CHECK_VERIFY(this));
2462 } else {
2463 VerificationType host_klass_type =
2464 VerificationType::reference_type(current_class()->host_klass()->name());
2465 subtype = ref_class_type.is_assignable_from(host_klass_type, this, CHECK_VERIFY(this));
2466
2467 // If invokespecial of IMR, need to recheck for same or
2468 // direct interface relative to the host class
2469 have_imr_indirect = (have_imr_indirect &&
2470 !is_same_or_direct_interface(
2471 InstanceKlass::cast(current_class()->host_klass()),
2472 host_klass_type, ref_class_type));
2473 }
2474 if (!subtype) {
2475 verify_error(ErrorContext::bad_code(bci),
2476 "Bad invokespecial instruction: "
2477 "current class isn't assignable to reference class.");
2478 return;
2479 } else if (have_imr_indirect) {
2480 verify_error(ErrorContext::bad_code(bci),
2481 "Bad invokespecial instruction: "
2482 "interface method reference is in an indirect superinterface.");
2483 return;
2484 }
2485
2486 }
2487 // Match method descriptor with operand stack
2488 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2489 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2490 }
2491 // Check objectref on operand stack
2492 if (opcode != Bytecodes::_invokestatic &&
2493 opcode != Bytecodes::_invokedynamic) {
2494 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2495 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2496 code_length, this_uninit, cp, CHECK_VERIFY(this));
2497 } else { // other methods
2498 // Ensures that target class is assignable to method class.
2499 if (opcode == Bytecodes::_invokespecial) {
2500 if (!current_class()->is_anonymous()) {
2501 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2502 } else {
2503 // anonymous class invokespecial calls: check if the
2504 // objectref is a subtype of the host_klass of the current class
2505 // to allow an anonymous class to reference methods in the host_klass
2506 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2507 VerificationType hosttype =
2508 VerificationType::reference_type(current_class()->host_klass()->name());
2509 bool subtype = hosttype.is_assignable_from(top, this, CHECK_VERIFY(this));
2510 if (!subtype) {
2511 verify_error( ErrorContext::bad_type(current_frame->offset(),
2512 current_frame->stack_top_ctx(),
2513 TypeOrigin::implicit(top)),
2514 "Bad type on operand stack");
2515 return;
2516 }
2517 }
2518 } else if (opcode == Bytecodes::_invokevirtual) {
2519 VerificationType stack_object_type =
2520 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2521 if (current_type() != stack_object_type) {
2522 assert(cp->cache() == NULL, "not rewritten yet");
2523 Symbol* ref_class_name =
2524 cp->klass_name_at(cp->klass_ref_index_at(index));
2525 // See the comments in verify_field_instructions() for
2526 // the rationale behind this.
2527 if (name_in_supers(ref_class_name, current_class())) {
2528 Klass* ref_class = load_class(ref_class_name, CHECK);
2529 if (is_protected_access(
2530 _klass, ref_class, method_name, method_sig, true)) {
2531 // It's protected access, check if stack object is
2532 // assignable to current class.
2533 bool is_assignable = current_type().is_assignable_from(
2534 stack_object_type, this, CHECK_VERIFY(this));
2535 if (!is_assignable) {
2536 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2537 && stack_object_type.is_array()
2538 && method_name == vmSymbols::clone_name()) {
2539 // Special case: arrays pretend to implement public Object
2540 // clone().
2541 } else {
2542 verify_error(ErrorContext::bad_type(bci,
2543 current_frame->stack_top_ctx(),
2544 TypeOrigin::implicit(current_type())),
2545 "Bad access to protected data in invokevirtual");
2546 return;
2547 }
2548 }
2549 }
2550 }
2551 }
2552 } else {
2553 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2554 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2555 }
2556 }
2557 }
2558 // Push the result type.
2559 if (sig_stream.type() != T_VOID) {
2560 if (method_name == vmSymbols::object_initializer_name()) {
2561 // <init> method must have a void return type
2562 /* Unreachable? Class file parser verifies that methods with '<' have
2563 * void return */
2564 verify_error(ErrorContext::bad_code(bci),
2565 "Return type must be void in <init> method");
2566 return;
2567 }
2568 VerificationType return_type[2];
2569 int n = change_sig_to_verificationType(
2570 &sig_stream, return_type, CHECK_VERIFY(this));
2571 for (int i = 0; i < n; i++) {
2572 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2573 }
2574 }
2575 }
2576
2577 VerificationType ClassVerifier::get_newarray_type(
2578 u2 index, u2 bci, TRAPS) {
2579 const char* from_bt[] = {
2580 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2581 };
2582 if (index < T_BOOLEAN || index > T_LONG) {
2583 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2584 return VerificationType::bogus_type();
2585 }
2586
2587 // from_bt[index] contains the array signature which has a length of 2
2588 Symbol* sig = create_temporary_symbol(
2589 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2590 return VerificationType::reference_type(sig);
2591 }
2592
2593 void ClassVerifier::verify_anewarray(
2594 u2 bci, u2 index, constantPoolHandle cp,
2595 StackMapFrame* current_frame, TRAPS) {
2596 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2597 current_frame->pop_stack(
2598 VerificationType::integer_type(), CHECK_VERIFY(this));
2599
2600 VerificationType component_type =
2601 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2602 int length;
2603 char* arr_sig_str;
2604 if (component_type.is_array()) { // it's an array
2605 const char* component_name = component_type.name()->as_utf8();
2606 // add one dimension to component
2607 length = (int)strlen(component_name) + 1;
2608 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2609 arr_sig_str[0] = '[';
2610 strncpy(&arr_sig_str[1], component_name, length - 1);
2611 } else { // it's an object or interface
2612 const char* component_name = component_type.name()->as_utf8();
2613 // add one dimension to component with 'L' prepended and ';' postpended.
2614 length = (int)strlen(component_name) + 3;
2615 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2616 arr_sig_str[0] = '[';
2617 arr_sig_str[1] = 'L';
2618 strncpy(&arr_sig_str[2], component_name, length - 2);
2619 arr_sig_str[length - 1] = ';';
2620 }
2621 Symbol* arr_sig = create_temporary_symbol(
2622 arr_sig_str, length, CHECK_VERIFY(this));
2623 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2624 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2625 }
2626
2627 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2628 current_frame->get_local(
2629 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2630 current_frame->push_stack(
2631 VerificationType::integer_type(), CHECK_VERIFY(this));
2632 }
2633
2634 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2635 current_frame->get_local_2(
2636 index, VerificationType::long_type(),
2637 VerificationType::long2_type(), CHECK_VERIFY(this));
2638 current_frame->push_stack_2(
2639 VerificationType::long_type(),
2640 VerificationType::long2_type(), CHECK_VERIFY(this));
2641 }
2642
2643 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2644 current_frame->get_local(
2645 index, VerificationType::float_type(), CHECK_VERIFY(this));
2646 current_frame->push_stack(
2647 VerificationType::float_type(), CHECK_VERIFY(this));
2648 }
2649
2650 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2651 current_frame->get_local_2(
2652 index, VerificationType::double_type(),
2653 VerificationType::double2_type(), CHECK_VERIFY(this));
2654 current_frame->push_stack_2(
2655 VerificationType::double_type(),
2656 VerificationType::double2_type(), CHECK_VERIFY(this));
2657 }
2658
2659 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2660 VerificationType type = current_frame->get_local(
2661 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2662 current_frame->push_stack(type, CHECK_VERIFY(this));
2663 }
2664
2665 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2666 current_frame->pop_stack(
2667 VerificationType::integer_type(), CHECK_VERIFY(this));
2668 current_frame->set_local(
2669 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2670 }
2671
2672 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2673 current_frame->pop_stack_2(
2674 VerificationType::long2_type(),
2675 VerificationType::long_type(), CHECK_VERIFY(this));
2676 current_frame->set_local_2(
2677 index, VerificationType::long_type(),
2678 VerificationType::long2_type(), CHECK_VERIFY(this));
2679 }
2680
2681 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2682 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2683 current_frame->set_local(
2684 index, VerificationType::float_type(), CHECK_VERIFY(this));
2685 }
2686
2687 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2688 current_frame->pop_stack_2(
2689 VerificationType::double2_type(),
2690 VerificationType::double_type(), CHECK_VERIFY(this));
2691 current_frame->set_local_2(
2692 index, VerificationType::double_type(),
2693 VerificationType::double2_type(), CHECK_VERIFY(this));
2694 }
2695
2696 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2697 VerificationType type = current_frame->pop_stack(
2698 VerificationType::reference_check(), CHECK_VERIFY(this));
2699 current_frame->set_local(index, type, CHECK_VERIFY(this));
2700 }
2701
2702 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2703 VerificationType type = current_frame->get_local(
2704 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2705 current_frame->set_local(index, type, CHECK_VERIFY(this));
2706 }
2707
2708 void ClassVerifier::verify_return_value(
2709 VerificationType return_type, VerificationType type, u2 bci,
2710 StackMapFrame* current_frame, TRAPS) {
2711 if (return_type == VerificationType::bogus_type()) {
2712 verify_error(ErrorContext::bad_type(bci,
2713 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2714 "Method expects a return value");
2715 return;
2716 }
2717 bool match = return_type.is_assignable_from(type, this, CHECK_VERIFY(this));
2718 if (!match) {
2719 verify_error(ErrorContext::bad_type(bci,
2720 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2721 "Bad return type");
2722 return;
2723 }
2724 }
2725
2726 // The verifier creates symbols which are substrings of Symbols.
2727 // These are stored in the verifier until the end of verification so that
2728 // they can be reference counted.
2729 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2730 int end, TRAPS) {
2731 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2732 _symbols->push(sym);
2733 return sym;
2734 }
2735
2736 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2737 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2738 _symbols->push(sym);
2739 return sym;
2740 }