1 /*
2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/stackMapTable.hpp"
29 #include "classfile/stackMapFrame.hpp"
30 #include "classfile/stackMapTableFormat.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/bytecodeStream.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "oops/typeArrayOop.hpp"
41 #include "prims/jvm.h"
42 #include "runtime/fieldDescriptor.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/orderAccess.inline.hpp"
47 #include "runtime/os.hpp"
48 #include "utilities/bytes.hpp"
49
50 #define NOFAILOVER_MAJOR_VERSION 51
51 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
52 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
53
54 // Access to external entry for VerifyClassCodes - old byte code verifier
55
56 extern "C" {
57 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
58 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
59 }
60
61 static void* volatile _verify_byte_codes_fn = NULL;
62
63 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
64
65 static void* verify_byte_codes_fn() {
66 if (_verify_byte_codes_fn == NULL) {
67 void *lib_handle = os::native_java_library();
68 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
69 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
70 if (func == NULL) {
71 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
72 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
73 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
74 }
75 }
76 return (void*)_verify_byte_codes_fn;
77 }
78
79
80 // Methods in Verifier
81
82 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
83 return (class_loader == NULL || !should_verify_class) ?
84 BytecodeVerificationLocal : BytecodeVerificationRemote;
85 }
86
87 bool Verifier::relax_verify_for(oop loader) {
88 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
89 bool need_verify =
90 // verifyAll
91 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
92 // verifyRemote
93 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
94 return !need_verify;
95 }
96
97 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
98 HandleMark hm;
99 ResourceMark rm(THREAD);
100
101 Symbol* exception_name = NULL;
102 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
103 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
104 char* exception_message = message_buffer;
105
106 const char* klassName = klass->external_name();
107 bool can_failover = FailOverToOldVerifier &&
108 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
109
110 // If the class should be verified, first see if we can use the split
111 // verifier. If not, or if verification fails and FailOverToOldVerifier
112 // is set, then call the inference verifier.
113 if (is_eligible_for_verification(klass, should_verify_class)) {
114 if (TraceClassInitialization) {
115 tty->print_cr("Start class verification for: %s", klassName);
116 }
117 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
118 ClassVerifier split_verifier(klass, THREAD);
119 split_verifier.verify_class(THREAD);
120 exception_name = split_verifier.result();
121 if (can_failover && !HAS_PENDING_EXCEPTION &&
122 (exception_name == vmSymbols::java_lang_VerifyError() ||
123 exception_name == vmSymbols::java_lang_ClassFormatError())) {
124 if (TraceClassInitialization || VerboseVerification) {
125 tty->print_cr(
126 "Fail over class verification to old verifier for: %s", klassName);
127 }
128 exception_name = inference_verify(
129 klass, message_buffer, message_buffer_len, THREAD);
130 }
131 if (exception_name != NULL) {
132 exception_message = split_verifier.exception_message();
133 }
134 } else {
135 exception_name = inference_verify(
136 klass, message_buffer, message_buffer_len, THREAD);
137 }
138
139 if (TraceClassInitialization || VerboseVerification) {
140 if (HAS_PENDING_EXCEPTION) {
141 tty->print("Verification for %s has", klassName);
142 tty->print_cr(" exception pending %s ",
143 InstanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
144 } else if (exception_name != NULL) {
145 tty->print_cr("Verification for %s failed", klassName);
146 }
147 tty->print_cr("End class verification for: %s", klassName);
148 }
149 }
150
151 if (HAS_PENDING_EXCEPTION) {
152 return false; // use the existing exception
153 } else if (exception_name == NULL) {
154 return true; // verifcation succeeded
155 } else { // VerifyError or ClassFormatError to be created and thrown
156 ResourceMark rm(THREAD);
157 instanceKlassHandle kls =
158 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
159 while (!kls.is_null()) {
160 if (kls == klass) {
161 // If the class being verified is the exception we're creating
162 // or one of it's superclasses, we're in trouble and are going
163 // to infinitely recurse when we try to initialize the exception.
164 // So bail out here by throwing the preallocated VM error.
165 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
166 }
167 kls = kls->super();
168 }
169 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
170 THROW_MSG_(exception_name, exception_message, false);
171 }
172 }
173
174 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
175 Symbol* name = klass->name();
176 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
177
178 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
179
180 return (should_verify_for(klass->class_loader(), should_verify_class) &&
181 // return if the class is a bootstrapping class
182 // or defineClass specified not to verify by default (flags override passed arg)
183 // We need to skip the following four for bootstraping
184 name != vmSymbols::java_lang_Object() &&
185 name != vmSymbols::java_lang_Class() &&
186 name != vmSymbols::java_lang_String() &&
187 name != vmSymbols::java_lang_Throwable() &&
188
189 // Can not verify the bytecodes for shared classes because they have
190 // already been rewritten to contain constant pool cache indices,
191 // which the verifier can't understand.
192 // Shared classes shouldn't have stackmaps either.
193 !klass()->is_shared() &&
194
195 // As of the fix for 4486457 we disable verification for all of the
196 // dynamically-generated bytecodes associated with the 1.4
197 // reflection implementation, not just those associated with
198 // sun/reflect/SerializationConstructorAccessor.
199 // NOTE: this is called too early in the bootstrapping process to be
200 // guarded by Universe::is_gte_jdk14x_version().
201 // Also for lambda generated code, gte jdk8
202 (!is_reflect));
203 }
204
205 Symbol* Verifier::inference_verify(
206 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
207 JavaThread* thread = (JavaThread*)THREAD;
208 JNIEnv *env = thread->jni_environment();
209
210 void* verify_func = verify_byte_codes_fn();
211
212 if (verify_func == NULL) {
213 jio_snprintf(message, message_len, "Could not link verifier");
214 return vmSymbols::java_lang_VerifyError();
215 }
216
217 ResourceMark rm(THREAD);
218 if (VerboseVerification) {
219 tty->print_cr("Verifying class %s with old format", klass->external_name());
220 }
221
222 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
223 jint result;
224
225 {
226 HandleMark hm(thread);
227 ThreadToNativeFromVM ttn(thread);
228 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
229 // code knows that we have left the VM
230
231 if (_is_new_verify_byte_codes_fn) {
232 verify_byte_codes_fn_new_t func =
233 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
234 result = (*func)(env, cls, message, (int)message_len,
235 klass->major_version());
236 } else {
237 verify_byte_codes_fn_t func =
238 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
239 result = (*func)(env, cls, message, (int)message_len);
240 }
241 }
242
243 JNIHandles::destroy_local(cls);
244
245 // These numbers are chosen so that VerifyClassCodes interface doesn't need
246 // to be changed (still return jboolean (unsigned char)), and result is
247 // 1 when verification is passed.
248 if (result == 0) {
249 return vmSymbols::java_lang_VerifyError();
250 } else if (result == 1) {
251 return NULL; // verified.
252 } else if (result == 2) {
253 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
254 } else if (result == 3) {
255 return vmSymbols::java_lang_ClassFormatError();
256 } else {
257 ShouldNotReachHere();
258 return NULL;
259 }
260 }
261
262 TypeOrigin TypeOrigin::null() {
263 return TypeOrigin();
264 }
265 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
266 assert(frame != NULL, "Must have a frame");
267 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
268 frame->local_at(index));
269 }
270 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
271 assert(frame != NULL, "Must have a frame");
272 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
273 frame->stack_at(index));
274 }
275 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
276 assert(frame != NULL, "Must have a frame");
277 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
278 frame->local_at(index));
279 }
280 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
281 assert(frame != NULL, "Must have a frame");
282 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
283 frame->stack_at(index));
284 }
285 TypeOrigin TypeOrigin::bad_index(u2 index) {
286 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
287 }
288 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
289 return TypeOrigin(CONST_POOL, index, NULL, vt);
290 }
291 TypeOrigin TypeOrigin::signature(VerificationType vt) {
292 return TypeOrigin(SIG, 0, NULL, vt);
293 }
294 TypeOrigin TypeOrigin::implicit(VerificationType t) {
295 return TypeOrigin(IMPLICIT, 0, NULL, t);
296 }
297 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
298 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
299 VerificationType::bogus_type());
300 }
301
302 void TypeOrigin::reset_frame() {
303 if (_frame != NULL) {
304 _frame->restore();
305 }
306 }
307
308 void TypeOrigin::details(outputStream* ss) const {
309 _type.print_on(ss);
310 switch (_origin) {
311 case CF_LOCALS:
312 ss->print(" (current frame, locals[%d])", _index);
313 break;
314 case CF_STACK:
315 ss->print(" (current frame, stack[%d])", _index);
316 break;
317 case SM_LOCALS:
318 ss->print(" (stack map, locals[%d])", _index);
319 break;
320 case SM_STACK:
321 ss->print(" (stack map, stack[%d])", _index);
322 break;
323 case CONST_POOL:
324 ss->print(" (constant pool %d)", _index);
325 break;
326 case SIG:
327 ss->print(" (from method signature)");
328 break;
329 case IMPLICIT:
330 case FRAME_ONLY:
331 case NONE:
332 default:
333 ;
334 }
335 }
336
337 #ifdef ASSERT
338 void TypeOrigin::print_on(outputStream* str) const {
339 str->print("{%d,%d,%p:", _origin, _index, _frame);
340 if (_frame != NULL) {
341 _frame->print_on(str);
342 } else {
343 str->print("null");
344 }
345 str->print(",");
346 _type.print_on(str);
347 str->print("}");
348 }
349 #endif
350
351 void ErrorContext::details(outputStream* ss, const Method* method) const {
352 if (is_valid()) {
353 ss->cr();
354 ss->print_cr("Exception Details:");
355 location_details(ss, method);
356 reason_details(ss);
357 frame_details(ss);
358 bytecode_details(ss, method);
359 handler_details(ss, method);
360 stackmap_details(ss, method);
361 }
362 }
363
364 void ErrorContext::reason_details(outputStream* ss) const {
365 streamIndentor si(ss);
366 ss->indent().print_cr("Reason:");
367 streamIndentor si2(ss);
368 ss->indent().print("%s", "");
369 switch (_fault) {
370 case INVALID_BYTECODE:
371 ss->print("Error exists in the bytecode");
372 break;
373 case WRONG_TYPE:
374 if (_expected.is_valid()) {
375 ss->print("Type ");
376 _type.details(ss);
377 ss->print(" is not assignable to ");
378 _expected.details(ss);
379 } else {
380 ss->print("Invalid type: ");
381 _type.details(ss);
382 }
383 break;
384 case FLAGS_MISMATCH:
385 if (_expected.is_valid()) {
386 ss->print("Current frame's flags are not assignable "
387 "to stack map frame's.");
388 } else {
389 ss->print("Current frame's flags are invalid in this context.");
390 }
391 break;
392 case BAD_CP_INDEX:
393 ss->print("Constant pool index %d is invalid", _type.index());
394 break;
395 case BAD_LOCAL_INDEX:
396 ss->print("Local index %d is invalid", _type.index());
397 break;
398 case LOCALS_SIZE_MISMATCH:
399 ss->print("Current frame's local size doesn't match stackmap.");
400 break;
401 case STACK_SIZE_MISMATCH:
402 ss->print("Current frame's stack size doesn't match stackmap.");
403 break;
404 case STACK_OVERFLOW:
405 ss->print("Exceeded max stack size.");
406 break;
407 case STACK_UNDERFLOW:
408 ss->print("Attempt to pop empty stack.");
409 break;
410 case MISSING_STACKMAP:
411 ss->print("Expected stackmap frame at this location.");
412 break;
413 case BAD_STACKMAP:
414 ss->print("Invalid stackmap specification.");
415 break;
416 case UNKNOWN:
417 default:
418 ShouldNotReachHere();
419 ss->print_cr("Unknown");
420 }
421 ss->cr();
422 }
423
424 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
425 if (_bci != -1 && method != NULL) {
426 streamIndentor si(ss);
427 const char* bytecode_name = "<invalid>";
428 if (method->validate_bci(_bci) != -1) {
429 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
430 if (Bytecodes::is_defined(code)) {
431 bytecode_name = Bytecodes::name(code);
432 } else {
433 bytecode_name = "<illegal>";
434 }
435 }
436 InstanceKlass* ik = method->method_holder();
437 ss->indent().print_cr("Location:");
438 streamIndentor si2(ss);
439 ss->indent().print_cr("%s.%s%s @%d: %s",
440 ik->name()->as_C_string(), method->name()->as_C_string(),
441 method->signature()->as_C_string(), _bci, bytecode_name);
442 }
443 }
444
445 void ErrorContext::frame_details(outputStream* ss) const {
446 streamIndentor si(ss);
447 if (_type.is_valid() && _type.frame() != NULL) {
448 ss->indent().print_cr("Current Frame:");
449 streamIndentor si2(ss);
450 _type.frame()->print_on(ss);
451 }
452 if (_expected.is_valid() && _expected.frame() != NULL) {
453 ss->indent().print_cr("Stackmap Frame:");
454 streamIndentor si2(ss);
455 _expected.frame()->print_on(ss);
456 }
457 }
458
459 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
460 if (method != NULL) {
461 streamIndentor si(ss);
462 ss->indent().print_cr("Bytecode:");
463 streamIndentor si2(ss);
464 ss->print_data(method->code_base(), method->code_size(), false);
465 }
466 }
467
468 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
469 if (method != NULL) {
470 streamIndentor si(ss);
471 ExceptionTable table(method);
472 if (table.length() > 0) {
473 ss->indent().print_cr("Exception Handler Table:");
474 streamIndentor si2(ss);
475 for (int i = 0; i < table.length(); ++i) {
476 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
477 table.end_pc(i), table.handler_pc(i));
478 }
479 }
480 }
481 }
482
483 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
484 if (method != NULL && method->has_stackmap_table()) {
485 streamIndentor si(ss);
486 ss->indent().print_cr("Stackmap Table:");
487 Array<u1>* data = method->stackmap_data();
488 stack_map_table* sm_table =
489 stack_map_table::at((address)data->adr_at(0));
490 stack_map_frame* sm_frame = sm_table->entries();
491 streamIndentor si2(ss);
492 int current_offset = -1;
493 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
494 ss->indent();
495 sm_frame->print_on(ss, current_offset);
496 ss->cr();
497 current_offset += sm_frame->offset_delta();
498 sm_frame = sm_frame->next();
499 }
500 }
501 }
502
503 // Methods in ClassVerifier
504
505 ClassVerifier::ClassVerifier(
506 instanceKlassHandle klass, TRAPS)
507 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
508 _this_type = VerificationType::reference_type(klass->name());
509 // Create list to hold symbols in reference area.
510 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
511 }
512
513 ClassVerifier::~ClassVerifier() {
514 // Decrement the reference count for any symbols created.
515 for (int i = 0; i < _symbols->length(); i++) {
516 Symbol* s = _symbols->at(i);
517 s->decrement_refcount();
518 }
519 }
520
521 VerificationType ClassVerifier::object_type() const {
522 return VerificationType::reference_type(vmSymbols::java_lang_Object());
523 }
524
525 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) {
526 VerificationType vt = VerificationType::reference_type(
527 create_temporary_symbol(sig, (int)strlen(sig), THREAD));
528 return TypeOrigin::implicit(vt);
529 }
530
531 void ClassVerifier::verify_class(TRAPS) {
532 if (VerboseVerification) {
533 tty->print_cr("Verifying class %s with new format",
534 _klass->external_name());
535 }
536
537 Array<Method*>* methods = _klass->methods();
538 int num_methods = methods->length();
539
540 for (int index = 0; index < num_methods; index++) {
541 // Check for recursive re-verification before each method.
542 if (was_recursively_verified()) return;
543
544 Method* m = methods->at(index);
545 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
546 // If m is native or abstract, skip it. It is checked in class file
547 // parser that methods do not override a final method. Overpass methods
548 // are trusted since the VM generates them.
549 continue;
550 }
551 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
552 }
553
554 if (VerboseVerification || TraceClassInitialization) {
555 if (was_recursively_verified())
556 tty->print_cr("Recursive verification detected for: %s",
557 _klass->external_name());
558 }
559 }
560
561 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
562 HandleMark hm(THREAD);
563 _method = m; // initialize _method
564 if (VerboseVerification) {
565 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
566 }
567
568 // For clang, the only good constant format string is a literal constant format string.
569 #define bad_type_msg "Bad type on operand stack in %s"
570
571 int32_t max_stack = m->verifier_max_stack();
572 int32_t max_locals = m->max_locals();
573 constantPoolHandle cp(THREAD, m->constants());
574
575 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
576 class_format_error("Invalid method signature");
577 return;
578 }
579
580 // Initial stack map frame: offset is 0, stack is initially empty.
581 StackMapFrame current_frame(max_locals, max_stack, this);
582 // Set initial locals
583 VerificationType return_type = current_frame.set_locals_from_arg(
584 m, current_type(), CHECK_VERIFY(this));
585
586 int32_t stackmap_index = 0; // index to the stackmap array
587
588 u4 code_length = m->code_size();
589
590 // Scan the bytecode and map each instruction's start offset to a number.
591 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
592
593 int ex_min = code_length;
594 int ex_max = -1;
595 // Look through each item on the exception table. Each of the fields must refer
596 // to a legal instruction.
597 verify_exception_handler_table(
598 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
599
600 // Look through each entry on the local variable table and make sure
601 // its range of code array offsets is valid. (4169817)
602 if (m->has_localvariable_table()) {
603 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
604 }
605
606 Array<u1>* stackmap_data = m->stackmap_data();
607 StackMapStream stream(stackmap_data);
608 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
609 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
610 code_data, code_length, CHECK_VERIFY(this));
611
612 if (VerboseVerification) {
613 stackmap_table.print_on(tty);
614 }
615
616 RawBytecodeStream bcs(m);
617
618 // Scan the byte code linearly from the start to the end
619 bool no_control_flow = false; // Set to true when there is no direct control
620 // flow from current instruction to the next
621 // instruction in sequence
622
623 set_furthest_jump(0);
624
625 Bytecodes::Code opcode;
626 while (!bcs.is_last_bytecode()) {
627 // Check for recursive re-verification before each bytecode.
628 if (was_recursively_verified()) return;
629
630 opcode = bcs.raw_next();
631 u2 bci = bcs.bci();
632
633 // Set current frame's offset to bci
634 current_frame.set_offset(bci);
635 current_frame.set_mark();
636
637 // Make sure every offset in stackmap table point to the beginning to
638 // an instruction. Match current_frame to stackmap_table entry with
639 // the same offset if exists.
640 stackmap_index = verify_stackmap_table(
641 stackmap_index, bci, ¤t_frame, &stackmap_table,
642 no_control_flow, CHECK_VERIFY(this));
643
644
645 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
646
647 // Merge with the next instruction
648 {
649 u2 index;
650 int target;
651 VerificationType type, type2;
652 VerificationType atype;
653
654 #ifndef PRODUCT
655 if (VerboseVerification) {
656 current_frame.print_on(tty);
657 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
658 }
659 #endif
660
661 // Make sure wide instruction is in correct format
662 if (bcs.is_wide()) {
663 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
664 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
665 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
666 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
667 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
668 opcode != Bytecodes::_dstore) {
669 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
670 * if we encounter a wide instruction that modifies an invalid
671 * opcode (not one of the ones listed above) */
672 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
673 return;
674 }
675 }
676
677 switch (opcode) {
678 case Bytecodes::_nop :
679 no_control_flow = false; break;
680 case Bytecodes::_aconst_null :
681 current_frame.push_stack(
682 VerificationType::null_type(), CHECK_VERIFY(this));
683 no_control_flow = false; break;
684 case Bytecodes::_iconst_m1 :
685 case Bytecodes::_iconst_0 :
686 case Bytecodes::_iconst_1 :
687 case Bytecodes::_iconst_2 :
688 case Bytecodes::_iconst_3 :
689 case Bytecodes::_iconst_4 :
690 case Bytecodes::_iconst_5 :
691 current_frame.push_stack(
692 VerificationType::integer_type(), CHECK_VERIFY(this));
693 no_control_flow = false; break;
694 case Bytecodes::_lconst_0 :
695 case Bytecodes::_lconst_1 :
696 current_frame.push_stack_2(
697 VerificationType::long_type(),
698 VerificationType::long2_type(), CHECK_VERIFY(this));
699 no_control_flow = false; break;
700 case Bytecodes::_fconst_0 :
701 case Bytecodes::_fconst_1 :
702 case Bytecodes::_fconst_2 :
703 current_frame.push_stack(
704 VerificationType::float_type(), CHECK_VERIFY(this));
705 no_control_flow = false; break;
706 case Bytecodes::_dconst_0 :
707 case Bytecodes::_dconst_1 :
708 current_frame.push_stack_2(
709 VerificationType::double_type(),
710 VerificationType::double2_type(), CHECK_VERIFY(this));
711 no_control_flow = false; break;
712 case Bytecodes::_sipush :
713 case Bytecodes::_bipush :
714 current_frame.push_stack(
715 VerificationType::integer_type(), CHECK_VERIFY(this));
716 no_control_flow = false; break;
717 case Bytecodes::_ldc :
718 verify_ldc(
719 opcode, bcs.get_index_u1(), ¤t_frame,
720 cp, bci, CHECK_VERIFY(this));
721 no_control_flow = false; break;
722 case Bytecodes::_ldc_w :
723 case Bytecodes::_ldc2_w :
724 verify_ldc(
725 opcode, bcs.get_index_u2(), ¤t_frame,
726 cp, bci, CHECK_VERIFY(this));
727 no_control_flow = false; break;
728 case Bytecodes::_iload :
729 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
730 no_control_flow = false; break;
731 case Bytecodes::_iload_0 :
732 case Bytecodes::_iload_1 :
733 case Bytecodes::_iload_2 :
734 case Bytecodes::_iload_3 :
735 index = opcode - Bytecodes::_iload_0;
736 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
737 no_control_flow = false; break;
738 case Bytecodes::_lload :
739 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
740 no_control_flow = false; break;
741 case Bytecodes::_lload_0 :
742 case Bytecodes::_lload_1 :
743 case Bytecodes::_lload_2 :
744 case Bytecodes::_lload_3 :
745 index = opcode - Bytecodes::_lload_0;
746 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
747 no_control_flow = false; break;
748 case Bytecodes::_fload :
749 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
750 no_control_flow = false; break;
751 case Bytecodes::_fload_0 :
752 case Bytecodes::_fload_1 :
753 case Bytecodes::_fload_2 :
754 case Bytecodes::_fload_3 :
755 index = opcode - Bytecodes::_fload_0;
756 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
757 no_control_flow = false; break;
758 case Bytecodes::_dload :
759 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
760 no_control_flow = false; break;
761 case Bytecodes::_dload_0 :
762 case Bytecodes::_dload_1 :
763 case Bytecodes::_dload_2 :
764 case Bytecodes::_dload_3 :
765 index = opcode - Bytecodes::_dload_0;
766 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
767 no_control_flow = false; break;
768 case Bytecodes::_aload :
769 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
770 no_control_flow = false; break;
771 case Bytecodes::_aload_0 :
772 case Bytecodes::_aload_1 :
773 case Bytecodes::_aload_2 :
774 case Bytecodes::_aload_3 :
775 index = opcode - Bytecodes::_aload_0;
776 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
777 no_control_flow = false; break;
778 case Bytecodes::_iaload :
779 type = current_frame.pop_stack(
780 VerificationType::integer_type(), CHECK_VERIFY(this));
781 atype = current_frame.pop_stack(
782 VerificationType::reference_check(), CHECK_VERIFY(this));
783 if (!atype.is_int_array()) {
784 verify_error(ErrorContext::bad_type(bci,
785 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
786 bad_type_msg, "iaload");
787 return;
788 }
789 current_frame.push_stack(
790 VerificationType::integer_type(), CHECK_VERIFY(this));
791 no_control_flow = false; break;
792 case Bytecodes::_baload :
793 type = current_frame.pop_stack(
794 VerificationType::integer_type(), CHECK_VERIFY(this));
795 atype = current_frame.pop_stack(
796 VerificationType::reference_check(), CHECK_VERIFY(this));
797 if (!atype.is_bool_array() && !atype.is_byte_array()) {
798 verify_error(
799 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
800 bad_type_msg, "baload");
801 return;
802 }
803 current_frame.push_stack(
804 VerificationType::integer_type(), CHECK_VERIFY(this));
805 no_control_flow = false; break;
806 case Bytecodes::_caload :
807 type = current_frame.pop_stack(
808 VerificationType::integer_type(), CHECK_VERIFY(this));
809 atype = current_frame.pop_stack(
810 VerificationType::reference_check(), CHECK_VERIFY(this));
811 if (!atype.is_char_array()) {
812 verify_error(ErrorContext::bad_type(bci,
813 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
814 bad_type_msg, "caload");
815 return;
816 }
817 current_frame.push_stack(
818 VerificationType::integer_type(), CHECK_VERIFY(this));
819 no_control_flow = false; break;
820 case Bytecodes::_saload :
821 type = current_frame.pop_stack(
822 VerificationType::integer_type(), CHECK_VERIFY(this));
823 atype = current_frame.pop_stack(
824 VerificationType::reference_check(), CHECK_VERIFY(this));
825 if (!atype.is_short_array()) {
826 verify_error(ErrorContext::bad_type(bci,
827 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
828 bad_type_msg, "saload");
829 return;
830 }
831 current_frame.push_stack(
832 VerificationType::integer_type(), CHECK_VERIFY(this));
833 no_control_flow = false; break;
834 case Bytecodes::_laload :
835 type = current_frame.pop_stack(
836 VerificationType::integer_type(), CHECK_VERIFY(this));
837 atype = current_frame.pop_stack(
838 VerificationType::reference_check(), CHECK_VERIFY(this));
839 if (!atype.is_long_array()) {
840 verify_error(ErrorContext::bad_type(bci,
841 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
842 bad_type_msg, "laload");
843 return;
844 }
845 current_frame.push_stack_2(
846 VerificationType::long_type(),
847 VerificationType::long2_type(), CHECK_VERIFY(this));
848 no_control_flow = false; break;
849 case Bytecodes::_faload :
850 type = current_frame.pop_stack(
851 VerificationType::integer_type(), CHECK_VERIFY(this));
852 atype = current_frame.pop_stack(
853 VerificationType::reference_check(), CHECK_VERIFY(this));
854 if (!atype.is_float_array()) {
855 verify_error(ErrorContext::bad_type(bci,
856 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
857 bad_type_msg, "faload");
858 return;
859 }
860 current_frame.push_stack(
861 VerificationType::float_type(), CHECK_VERIFY(this));
862 no_control_flow = false; break;
863 case Bytecodes::_daload :
864 type = current_frame.pop_stack(
865 VerificationType::integer_type(), CHECK_VERIFY(this));
866 atype = current_frame.pop_stack(
867 VerificationType::reference_check(), CHECK_VERIFY(this));
868 if (!atype.is_double_array()) {
869 verify_error(ErrorContext::bad_type(bci,
870 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
871 bad_type_msg, "daload");
872 return;
873 }
874 current_frame.push_stack_2(
875 VerificationType::double_type(),
876 VerificationType::double2_type(), CHECK_VERIFY(this));
877 no_control_flow = false; break;
878 case Bytecodes::_aaload : {
879 type = current_frame.pop_stack(
880 VerificationType::integer_type(), CHECK_VERIFY(this));
881 atype = current_frame.pop_stack(
882 VerificationType::reference_check(), CHECK_VERIFY(this));
883 if (!atype.is_reference_array()) {
884 verify_error(ErrorContext::bad_type(bci,
885 current_frame.stack_top_ctx(),
886 TypeOrigin::implicit(VerificationType::reference_check())),
887 bad_type_msg, "aaload");
888 return;
889 }
890 if (atype.is_null()) {
891 current_frame.push_stack(
892 VerificationType::null_type(), CHECK_VERIFY(this));
893 } else {
894 VerificationType component =
895 atype.get_component(this, CHECK_VERIFY(this));
896 current_frame.push_stack(component, CHECK_VERIFY(this));
897 }
898 no_control_flow = false; break;
899 }
900 case Bytecodes::_istore :
901 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
902 no_control_flow = false; break;
903 case Bytecodes::_istore_0 :
904 case Bytecodes::_istore_1 :
905 case Bytecodes::_istore_2 :
906 case Bytecodes::_istore_3 :
907 index = opcode - Bytecodes::_istore_0;
908 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
909 no_control_flow = false; break;
910 case Bytecodes::_lstore :
911 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
912 no_control_flow = false; break;
913 case Bytecodes::_lstore_0 :
914 case Bytecodes::_lstore_1 :
915 case Bytecodes::_lstore_2 :
916 case Bytecodes::_lstore_3 :
917 index = opcode - Bytecodes::_lstore_0;
918 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
919 no_control_flow = false; break;
920 case Bytecodes::_fstore :
921 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
922 no_control_flow = false; break;
923 case Bytecodes::_fstore_0 :
924 case Bytecodes::_fstore_1 :
925 case Bytecodes::_fstore_2 :
926 case Bytecodes::_fstore_3 :
927 index = opcode - Bytecodes::_fstore_0;
928 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
929 no_control_flow = false; break;
930 case Bytecodes::_dstore :
931 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
932 no_control_flow = false; break;
933 case Bytecodes::_dstore_0 :
934 case Bytecodes::_dstore_1 :
935 case Bytecodes::_dstore_2 :
936 case Bytecodes::_dstore_3 :
937 index = opcode - Bytecodes::_dstore_0;
938 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
939 no_control_flow = false; break;
940 case Bytecodes::_astore :
941 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
942 no_control_flow = false; break;
943 case Bytecodes::_astore_0 :
944 case Bytecodes::_astore_1 :
945 case Bytecodes::_astore_2 :
946 case Bytecodes::_astore_3 :
947 index = opcode - Bytecodes::_astore_0;
948 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
949 no_control_flow = false; break;
950 case Bytecodes::_iastore :
951 type = current_frame.pop_stack(
952 VerificationType::integer_type(), CHECK_VERIFY(this));
953 type2 = current_frame.pop_stack(
954 VerificationType::integer_type(), CHECK_VERIFY(this));
955 atype = current_frame.pop_stack(
956 VerificationType::reference_check(), CHECK_VERIFY(this));
957 if (!atype.is_int_array()) {
958 verify_error(ErrorContext::bad_type(bci,
959 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
960 bad_type_msg, "iastore");
961 return;
962 }
963 no_control_flow = false; break;
964 case Bytecodes::_bastore :
965 type = current_frame.pop_stack(
966 VerificationType::integer_type(), CHECK_VERIFY(this));
967 type2 = current_frame.pop_stack(
968 VerificationType::integer_type(), CHECK_VERIFY(this));
969 atype = current_frame.pop_stack(
970 VerificationType::reference_check(), CHECK_VERIFY(this));
971 if (!atype.is_bool_array() && !atype.is_byte_array()) {
972 verify_error(
973 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
974 bad_type_msg, "bastore");
975 return;
976 }
977 no_control_flow = false; break;
978 case Bytecodes::_castore :
979 current_frame.pop_stack(
980 VerificationType::integer_type(), CHECK_VERIFY(this));
981 current_frame.pop_stack(
982 VerificationType::integer_type(), CHECK_VERIFY(this));
983 atype = current_frame.pop_stack(
984 VerificationType::reference_check(), CHECK_VERIFY(this));
985 if (!atype.is_char_array()) {
986 verify_error(ErrorContext::bad_type(bci,
987 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
988 bad_type_msg, "castore");
989 return;
990 }
991 no_control_flow = false; break;
992 case Bytecodes::_sastore :
993 current_frame.pop_stack(
994 VerificationType::integer_type(), CHECK_VERIFY(this));
995 current_frame.pop_stack(
996 VerificationType::integer_type(), CHECK_VERIFY(this));
997 atype = current_frame.pop_stack(
998 VerificationType::reference_check(), CHECK_VERIFY(this));
999 if (!atype.is_short_array()) {
1000 verify_error(ErrorContext::bad_type(bci,
1001 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1002 bad_type_msg, "sastore");
1003 return;
1004 }
1005 no_control_flow = false; break;
1006 case Bytecodes::_lastore :
1007 current_frame.pop_stack_2(
1008 VerificationType::long2_type(),
1009 VerificationType::long_type(), CHECK_VERIFY(this));
1010 current_frame.pop_stack(
1011 VerificationType::integer_type(), CHECK_VERIFY(this));
1012 atype = current_frame.pop_stack(
1013 VerificationType::reference_check(), CHECK_VERIFY(this));
1014 if (!atype.is_long_array()) {
1015 verify_error(ErrorContext::bad_type(bci,
1016 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1017 bad_type_msg, "lastore");
1018 return;
1019 }
1020 no_control_flow = false; break;
1021 case Bytecodes::_fastore :
1022 current_frame.pop_stack(
1023 VerificationType::float_type(), CHECK_VERIFY(this));
1024 current_frame.pop_stack
1025 (VerificationType::integer_type(), CHECK_VERIFY(this));
1026 atype = current_frame.pop_stack(
1027 VerificationType::reference_check(), CHECK_VERIFY(this));
1028 if (!atype.is_float_array()) {
1029 verify_error(ErrorContext::bad_type(bci,
1030 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1031 bad_type_msg, "fastore");
1032 return;
1033 }
1034 no_control_flow = false; break;
1035 case Bytecodes::_dastore :
1036 current_frame.pop_stack_2(
1037 VerificationType::double2_type(),
1038 VerificationType::double_type(), CHECK_VERIFY(this));
1039 current_frame.pop_stack(
1040 VerificationType::integer_type(), CHECK_VERIFY(this));
1041 atype = current_frame.pop_stack(
1042 VerificationType::reference_check(), CHECK_VERIFY(this));
1043 if (!atype.is_double_array()) {
1044 verify_error(ErrorContext::bad_type(bci,
1045 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1046 bad_type_msg, "dastore");
1047 return;
1048 }
1049 no_control_flow = false; break;
1050 case Bytecodes::_aastore :
1051 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1052 type2 = current_frame.pop_stack(
1053 VerificationType::integer_type(), CHECK_VERIFY(this));
1054 atype = current_frame.pop_stack(
1055 VerificationType::reference_check(), CHECK_VERIFY(this));
1056 // more type-checking is done at runtime
1057 if (!atype.is_reference_array()) {
1058 verify_error(ErrorContext::bad_type(bci,
1059 current_frame.stack_top_ctx(),
1060 TypeOrigin::implicit(VerificationType::reference_check())),
1061 bad_type_msg, "aastore");
1062 return;
1063 }
1064 // 4938384: relaxed constraint in JVMS 3nd edition.
1065 no_control_flow = false; break;
1066 case Bytecodes::_pop :
1067 current_frame.pop_stack(
1068 VerificationType::category1_check(), CHECK_VERIFY(this));
1069 no_control_flow = false; break;
1070 case Bytecodes::_pop2 :
1071 type = current_frame.pop_stack(CHECK_VERIFY(this));
1072 if (type.is_category1()) {
1073 current_frame.pop_stack(
1074 VerificationType::category1_check(), CHECK_VERIFY(this));
1075 } else if (type.is_category2_2nd()) {
1076 current_frame.pop_stack(
1077 VerificationType::category2_check(), CHECK_VERIFY(this));
1078 } else {
1079 /* Unreachable? Would need a category2_1st on TOS
1080 * which does not appear possible. */
1081 verify_error(
1082 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1083 bad_type_msg, "pop2");
1084 return;
1085 }
1086 no_control_flow = false; break;
1087 case Bytecodes::_dup :
1088 type = current_frame.pop_stack(
1089 VerificationType::category1_check(), CHECK_VERIFY(this));
1090 current_frame.push_stack(type, CHECK_VERIFY(this));
1091 current_frame.push_stack(type, CHECK_VERIFY(this));
1092 no_control_flow = false; break;
1093 case Bytecodes::_dup_x1 :
1094 type = current_frame.pop_stack(
1095 VerificationType::category1_check(), CHECK_VERIFY(this));
1096 type2 = current_frame.pop_stack(
1097 VerificationType::category1_check(), CHECK_VERIFY(this));
1098 current_frame.push_stack(type, CHECK_VERIFY(this));
1099 current_frame.push_stack(type2, CHECK_VERIFY(this));
1100 current_frame.push_stack(type, CHECK_VERIFY(this));
1101 no_control_flow = false; break;
1102 case Bytecodes::_dup_x2 :
1103 {
1104 VerificationType type3;
1105 type = current_frame.pop_stack(
1106 VerificationType::category1_check(), CHECK_VERIFY(this));
1107 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1108 if (type2.is_category1()) {
1109 type3 = current_frame.pop_stack(
1110 VerificationType::category1_check(), CHECK_VERIFY(this));
1111 } else if (type2.is_category2_2nd()) {
1112 type3 = current_frame.pop_stack(
1113 VerificationType::category2_check(), CHECK_VERIFY(this));
1114 } else {
1115 /* Unreachable? Would need a category2_1st at stack depth 2 with
1116 * a category1 on TOS which does not appear possible. */
1117 verify_error(ErrorContext::bad_type(
1118 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1119 return;
1120 }
1121 current_frame.push_stack(type, CHECK_VERIFY(this));
1122 current_frame.push_stack(type3, CHECK_VERIFY(this));
1123 current_frame.push_stack(type2, CHECK_VERIFY(this));
1124 current_frame.push_stack(type, CHECK_VERIFY(this));
1125 no_control_flow = false; break;
1126 }
1127 case Bytecodes::_dup2 :
1128 type = current_frame.pop_stack(CHECK_VERIFY(this));
1129 if (type.is_category1()) {
1130 type2 = current_frame.pop_stack(
1131 VerificationType::category1_check(), CHECK_VERIFY(this));
1132 } else if (type.is_category2_2nd()) {
1133 type2 = current_frame.pop_stack(
1134 VerificationType::category2_check(), CHECK_VERIFY(this));
1135 } else {
1136 /* Unreachable? Would need a category2_1st on TOS which does not
1137 * appear possible. */
1138 verify_error(
1139 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1140 bad_type_msg, "dup2");
1141 return;
1142 }
1143 current_frame.push_stack(type2, CHECK_VERIFY(this));
1144 current_frame.push_stack(type, CHECK_VERIFY(this));
1145 current_frame.push_stack(type2, CHECK_VERIFY(this));
1146 current_frame.push_stack(type, CHECK_VERIFY(this));
1147 no_control_flow = false; break;
1148 case Bytecodes::_dup2_x1 :
1149 {
1150 VerificationType type3;
1151 type = current_frame.pop_stack(CHECK_VERIFY(this));
1152 if (type.is_category1()) {
1153 type2 = current_frame.pop_stack(
1154 VerificationType::category1_check(), CHECK_VERIFY(this));
1155 } else if (type.is_category2_2nd()) {
1156 type2 = current_frame.pop_stack(
1157 VerificationType::category2_check(), CHECK_VERIFY(this));
1158 } else {
1159 /* Unreachable? Would need a category2_1st on TOS which does
1160 * not appear possible. */
1161 verify_error(
1162 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1163 bad_type_msg, "dup2_x1");
1164 return;
1165 }
1166 type3 = current_frame.pop_stack(
1167 VerificationType::category1_check(), CHECK_VERIFY(this));
1168 current_frame.push_stack(type2, CHECK_VERIFY(this));
1169 current_frame.push_stack(type, CHECK_VERIFY(this));
1170 current_frame.push_stack(type3, CHECK_VERIFY(this));
1171 current_frame.push_stack(type2, CHECK_VERIFY(this));
1172 current_frame.push_stack(type, CHECK_VERIFY(this));
1173 no_control_flow = false; break;
1174 }
1175 case Bytecodes::_dup2_x2 :
1176 {
1177 VerificationType type3, type4;
1178 type = current_frame.pop_stack(CHECK_VERIFY(this));
1179 if (type.is_category1()) {
1180 type2 = current_frame.pop_stack(
1181 VerificationType::category1_check(), CHECK_VERIFY(this));
1182 } else if (type.is_category2_2nd()) {
1183 type2 = current_frame.pop_stack(
1184 VerificationType::category2_check(), CHECK_VERIFY(this));
1185 } else {
1186 /* Unreachable? Would need a category2_1st on TOS which does
1187 * not appear possible. */
1188 verify_error(
1189 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1190 bad_type_msg, "dup2_x2");
1191 return;
1192 }
1193 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1194 if (type3.is_category1()) {
1195 type4 = current_frame.pop_stack(
1196 VerificationType::category1_check(), CHECK_VERIFY(this));
1197 } else if (type3.is_category2_2nd()) {
1198 type4 = current_frame.pop_stack(
1199 VerificationType::category2_check(), CHECK_VERIFY(this));
1200 } else {
1201 /* Unreachable? Would need a category2_1st on TOS after popping
1202 * a long/double or two category 1's, which does not
1203 * appear possible. */
1204 verify_error(
1205 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1206 bad_type_msg, "dup2_x2");
1207 return;
1208 }
1209 current_frame.push_stack(type2, CHECK_VERIFY(this));
1210 current_frame.push_stack(type, CHECK_VERIFY(this));
1211 current_frame.push_stack(type4, CHECK_VERIFY(this));
1212 current_frame.push_stack(type3, CHECK_VERIFY(this));
1213 current_frame.push_stack(type2, CHECK_VERIFY(this));
1214 current_frame.push_stack(type, CHECK_VERIFY(this));
1215 no_control_flow = false; break;
1216 }
1217 case Bytecodes::_swap :
1218 type = current_frame.pop_stack(
1219 VerificationType::category1_check(), CHECK_VERIFY(this));
1220 type2 = current_frame.pop_stack(
1221 VerificationType::category1_check(), CHECK_VERIFY(this));
1222 current_frame.push_stack(type, CHECK_VERIFY(this));
1223 current_frame.push_stack(type2, CHECK_VERIFY(this));
1224 no_control_flow = false; break;
1225 case Bytecodes::_iadd :
1226 case Bytecodes::_isub :
1227 case Bytecodes::_imul :
1228 case Bytecodes::_idiv :
1229 case Bytecodes::_irem :
1230 case Bytecodes::_ishl :
1231 case Bytecodes::_ishr :
1232 case Bytecodes::_iushr :
1233 case Bytecodes::_ior :
1234 case Bytecodes::_ixor :
1235 case Bytecodes::_iand :
1236 current_frame.pop_stack(
1237 VerificationType::integer_type(), CHECK_VERIFY(this));
1238 // fall through
1239 case Bytecodes::_ineg :
1240 current_frame.pop_stack(
1241 VerificationType::integer_type(), CHECK_VERIFY(this));
1242 current_frame.push_stack(
1243 VerificationType::integer_type(), CHECK_VERIFY(this));
1244 no_control_flow = false; break;
1245 case Bytecodes::_ladd :
1246 case Bytecodes::_lsub :
1247 case Bytecodes::_lmul :
1248 case Bytecodes::_ldiv :
1249 case Bytecodes::_lrem :
1250 case Bytecodes::_land :
1251 case Bytecodes::_lor :
1252 case Bytecodes::_lxor :
1253 current_frame.pop_stack_2(
1254 VerificationType::long2_type(),
1255 VerificationType::long_type(), CHECK_VERIFY(this));
1256 // fall through
1257 case Bytecodes::_lneg :
1258 current_frame.pop_stack_2(
1259 VerificationType::long2_type(),
1260 VerificationType::long_type(), CHECK_VERIFY(this));
1261 current_frame.push_stack_2(
1262 VerificationType::long_type(),
1263 VerificationType::long2_type(), CHECK_VERIFY(this));
1264 no_control_flow = false; break;
1265 case Bytecodes::_lshl :
1266 case Bytecodes::_lshr :
1267 case Bytecodes::_lushr :
1268 current_frame.pop_stack(
1269 VerificationType::integer_type(), CHECK_VERIFY(this));
1270 current_frame.pop_stack_2(
1271 VerificationType::long2_type(),
1272 VerificationType::long_type(), CHECK_VERIFY(this));
1273 current_frame.push_stack_2(
1274 VerificationType::long_type(),
1275 VerificationType::long2_type(), CHECK_VERIFY(this));
1276 no_control_flow = false; break;
1277 case Bytecodes::_fadd :
1278 case Bytecodes::_fsub :
1279 case Bytecodes::_fmul :
1280 case Bytecodes::_fdiv :
1281 case Bytecodes::_frem :
1282 current_frame.pop_stack(
1283 VerificationType::float_type(), CHECK_VERIFY(this));
1284 // fall through
1285 case Bytecodes::_fneg :
1286 current_frame.pop_stack(
1287 VerificationType::float_type(), CHECK_VERIFY(this));
1288 current_frame.push_stack(
1289 VerificationType::float_type(), CHECK_VERIFY(this));
1290 no_control_flow = false; break;
1291 case Bytecodes::_dadd :
1292 case Bytecodes::_dsub :
1293 case Bytecodes::_dmul :
1294 case Bytecodes::_ddiv :
1295 case Bytecodes::_drem :
1296 current_frame.pop_stack_2(
1297 VerificationType::double2_type(),
1298 VerificationType::double_type(), CHECK_VERIFY(this));
1299 // fall through
1300 case Bytecodes::_dneg :
1301 current_frame.pop_stack_2(
1302 VerificationType::double2_type(),
1303 VerificationType::double_type(), CHECK_VERIFY(this));
1304 current_frame.push_stack_2(
1305 VerificationType::double_type(),
1306 VerificationType::double2_type(), CHECK_VERIFY(this));
1307 no_control_flow = false; break;
1308 case Bytecodes::_iinc :
1309 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1310 no_control_flow = false; break;
1311 case Bytecodes::_i2l :
1312 type = current_frame.pop_stack(
1313 VerificationType::integer_type(), CHECK_VERIFY(this));
1314 current_frame.push_stack_2(
1315 VerificationType::long_type(),
1316 VerificationType::long2_type(), CHECK_VERIFY(this));
1317 no_control_flow = false; break;
1318 case Bytecodes::_l2i :
1319 current_frame.pop_stack_2(
1320 VerificationType::long2_type(),
1321 VerificationType::long_type(), CHECK_VERIFY(this));
1322 current_frame.push_stack(
1323 VerificationType::integer_type(), CHECK_VERIFY(this));
1324 no_control_flow = false; break;
1325 case Bytecodes::_i2f :
1326 current_frame.pop_stack(
1327 VerificationType::integer_type(), CHECK_VERIFY(this));
1328 current_frame.push_stack(
1329 VerificationType::float_type(), CHECK_VERIFY(this));
1330 no_control_flow = false; break;
1331 case Bytecodes::_i2d :
1332 current_frame.pop_stack(
1333 VerificationType::integer_type(), CHECK_VERIFY(this));
1334 current_frame.push_stack_2(
1335 VerificationType::double_type(),
1336 VerificationType::double2_type(), CHECK_VERIFY(this));
1337 no_control_flow = false; break;
1338 case Bytecodes::_l2f :
1339 current_frame.pop_stack_2(
1340 VerificationType::long2_type(),
1341 VerificationType::long_type(), CHECK_VERIFY(this));
1342 current_frame.push_stack(
1343 VerificationType::float_type(), CHECK_VERIFY(this));
1344 no_control_flow = false; break;
1345 case Bytecodes::_l2d :
1346 current_frame.pop_stack_2(
1347 VerificationType::long2_type(),
1348 VerificationType::long_type(), CHECK_VERIFY(this));
1349 current_frame.push_stack_2(
1350 VerificationType::double_type(),
1351 VerificationType::double2_type(), CHECK_VERIFY(this));
1352 no_control_flow = false; break;
1353 case Bytecodes::_f2i :
1354 current_frame.pop_stack(
1355 VerificationType::float_type(), CHECK_VERIFY(this));
1356 current_frame.push_stack(
1357 VerificationType::integer_type(), CHECK_VERIFY(this));
1358 no_control_flow = false; break;
1359 case Bytecodes::_f2l :
1360 current_frame.pop_stack(
1361 VerificationType::float_type(), CHECK_VERIFY(this));
1362 current_frame.push_stack_2(
1363 VerificationType::long_type(),
1364 VerificationType::long2_type(), CHECK_VERIFY(this));
1365 no_control_flow = false; break;
1366 case Bytecodes::_f2d :
1367 current_frame.pop_stack(
1368 VerificationType::float_type(), CHECK_VERIFY(this));
1369 current_frame.push_stack_2(
1370 VerificationType::double_type(),
1371 VerificationType::double2_type(), CHECK_VERIFY(this));
1372 no_control_flow = false; break;
1373 case Bytecodes::_d2i :
1374 current_frame.pop_stack_2(
1375 VerificationType::double2_type(),
1376 VerificationType::double_type(), CHECK_VERIFY(this));
1377 current_frame.push_stack(
1378 VerificationType::integer_type(), CHECK_VERIFY(this));
1379 no_control_flow = false; break;
1380 case Bytecodes::_d2l :
1381 current_frame.pop_stack_2(
1382 VerificationType::double2_type(),
1383 VerificationType::double_type(), CHECK_VERIFY(this));
1384 current_frame.push_stack_2(
1385 VerificationType::long_type(),
1386 VerificationType::long2_type(), CHECK_VERIFY(this));
1387 no_control_flow = false; break;
1388 case Bytecodes::_d2f :
1389 current_frame.pop_stack_2(
1390 VerificationType::double2_type(),
1391 VerificationType::double_type(), CHECK_VERIFY(this));
1392 current_frame.push_stack(
1393 VerificationType::float_type(), CHECK_VERIFY(this));
1394 no_control_flow = false; break;
1395 case Bytecodes::_i2b :
1396 case Bytecodes::_i2c :
1397 case Bytecodes::_i2s :
1398 current_frame.pop_stack(
1399 VerificationType::integer_type(), CHECK_VERIFY(this));
1400 current_frame.push_stack(
1401 VerificationType::integer_type(), CHECK_VERIFY(this));
1402 no_control_flow = false; break;
1403 case Bytecodes::_lcmp :
1404 current_frame.pop_stack_2(
1405 VerificationType::long2_type(),
1406 VerificationType::long_type(), CHECK_VERIFY(this));
1407 current_frame.pop_stack_2(
1408 VerificationType::long2_type(),
1409 VerificationType::long_type(), CHECK_VERIFY(this));
1410 current_frame.push_stack(
1411 VerificationType::integer_type(), CHECK_VERIFY(this));
1412 no_control_flow = false; break;
1413 case Bytecodes::_fcmpl :
1414 case Bytecodes::_fcmpg :
1415 current_frame.pop_stack(
1416 VerificationType::float_type(), CHECK_VERIFY(this));
1417 current_frame.pop_stack(
1418 VerificationType::float_type(), CHECK_VERIFY(this));
1419 current_frame.push_stack(
1420 VerificationType::integer_type(), CHECK_VERIFY(this));
1421 no_control_flow = false; break;
1422 case Bytecodes::_dcmpl :
1423 case Bytecodes::_dcmpg :
1424 current_frame.pop_stack_2(
1425 VerificationType::double2_type(),
1426 VerificationType::double_type(), CHECK_VERIFY(this));
1427 current_frame.pop_stack_2(
1428 VerificationType::double2_type(),
1429 VerificationType::double_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::_if_icmpeq:
1434 case Bytecodes::_if_icmpne:
1435 case Bytecodes::_if_icmplt:
1436 case Bytecodes::_if_icmpge:
1437 case Bytecodes::_if_icmpgt:
1438 case Bytecodes::_if_icmple:
1439 current_frame.pop_stack(
1440 VerificationType::integer_type(), CHECK_VERIFY(this));
1441 // fall through
1442 case Bytecodes::_ifeq:
1443 case Bytecodes::_ifne:
1444 case Bytecodes::_iflt:
1445 case Bytecodes::_ifge:
1446 case Bytecodes::_ifgt:
1447 case Bytecodes::_ifle:
1448 current_frame.pop_stack(
1449 VerificationType::integer_type(), CHECK_VERIFY(this));
1450 target = bcs.dest();
1451 stackmap_table.check_jump_target(
1452 ¤t_frame, target, CHECK_VERIFY(this));
1453 no_control_flow = false; break;
1454 case Bytecodes::_if_acmpeq :
1455 case Bytecodes::_if_acmpne :
1456 current_frame.pop_stack(
1457 VerificationType::reference_check(), CHECK_VERIFY(this));
1458 // fall through
1459 case Bytecodes::_ifnull :
1460 case Bytecodes::_ifnonnull :
1461 current_frame.pop_stack(
1462 VerificationType::reference_check(), CHECK_VERIFY(this));
1463 target = bcs.dest();
1464 stackmap_table.check_jump_target
1465 (¤t_frame, target, CHECK_VERIFY(this));
1466 no_control_flow = false; break;
1467 case Bytecodes::_goto :
1468 target = bcs.dest();
1469 stackmap_table.check_jump_target(
1470 ¤t_frame, target, CHECK_VERIFY(this));
1471 no_control_flow = true; break;
1472 case Bytecodes::_goto_w :
1473 target = bcs.dest_w();
1474 stackmap_table.check_jump_target(
1475 ¤t_frame, target, CHECK_VERIFY(this));
1476 no_control_flow = true; break;
1477 case Bytecodes::_tableswitch :
1478 case Bytecodes::_lookupswitch :
1479 verify_switch(
1480 &bcs, code_length, code_data, ¤t_frame,
1481 &stackmap_table, CHECK_VERIFY(this));
1482 no_control_flow = true; break;
1483 case Bytecodes::_ireturn :
1484 type = current_frame.pop_stack(
1485 VerificationType::integer_type(), CHECK_VERIFY(this));
1486 verify_return_value(return_type, type, bci,
1487 ¤t_frame, CHECK_VERIFY(this));
1488 no_control_flow = true; break;
1489 case Bytecodes::_lreturn :
1490 type2 = current_frame.pop_stack(
1491 VerificationType::long2_type(), CHECK_VERIFY(this));
1492 type = current_frame.pop_stack(
1493 VerificationType::long_type(), CHECK_VERIFY(this));
1494 verify_return_value(return_type, type, bci,
1495 ¤t_frame, CHECK_VERIFY(this));
1496 no_control_flow = true; break;
1497 case Bytecodes::_freturn :
1498 type = current_frame.pop_stack(
1499 VerificationType::float_type(), CHECK_VERIFY(this));
1500 verify_return_value(return_type, type, bci,
1501 ¤t_frame, CHECK_VERIFY(this));
1502 no_control_flow = true; break;
1503 case Bytecodes::_dreturn :
1504 type2 = current_frame.pop_stack(
1505 VerificationType::double2_type(), CHECK_VERIFY(this));
1506 type = current_frame.pop_stack(
1507 VerificationType::double_type(), CHECK_VERIFY(this));
1508 verify_return_value(return_type, type, bci,
1509 ¤t_frame, CHECK_VERIFY(this));
1510 no_control_flow = true; break;
1511 case Bytecodes::_areturn :
1512 type = current_frame.pop_stack(
1513 VerificationType::reference_check(), CHECK_VERIFY(this));
1514 verify_return_value(return_type, type, bci,
1515 ¤t_frame, CHECK_VERIFY(this));
1516 no_control_flow = true; break;
1517 case Bytecodes::_return :
1518 if (return_type != VerificationType::bogus_type()) {
1519 verify_error(ErrorContext::bad_code(bci),
1520 "Method expects a return value");
1521 return;
1522 }
1523 // Make sure "this" has been initialized if current method is an
1524 // <init>
1525 if (_method->name() == vmSymbols::object_initializer_name() &&
1526 current_frame.flag_this_uninit()) {
1527 verify_error(ErrorContext::bad_code(bci),
1528 "Constructor must call super() or this() "
1529 "before return");
1530 return;
1531 }
1532 no_control_flow = true; break;
1533 case Bytecodes::_getstatic :
1534 case Bytecodes::_putstatic :
1535 case Bytecodes::_getfield :
1536 case Bytecodes::_putfield :
1537 verify_field_instructions(
1538 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1539 no_control_flow = false; break;
1540 case Bytecodes::_invokevirtual :
1541 case Bytecodes::_invokespecial :
1542 case Bytecodes::_invokestatic :
1543 verify_invoke_instructions(
1544 &bcs, code_length, ¤t_frame,
1545 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1546 no_control_flow = false; break;
1547 case Bytecodes::_invokeinterface :
1548 case Bytecodes::_invokedynamic :
1549 verify_invoke_instructions(
1550 &bcs, code_length, ¤t_frame,
1551 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1552 no_control_flow = false; break;
1553 case Bytecodes::_new :
1554 {
1555 index = bcs.get_index_u2();
1556 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1557 VerificationType new_class_type =
1558 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1559 if (!new_class_type.is_object()) {
1560 verify_error(ErrorContext::bad_type(bci,
1561 TypeOrigin::cp(index, new_class_type)),
1562 "Illegal new instruction");
1563 return;
1564 }
1565 type = VerificationType::uninitialized_type(bci);
1566 current_frame.push_stack(type, CHECK_VERIFY(this));
1567 no_control_flow = false; break;
1568 }
1569 case Bytecodes::_newarray :
1570 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1571 current_frame.pop_stack(
1572 VerificationType::integer_type(), CHECK_VERIFY(this));
1573 current_frame.push_stack(type, CHECK_VERIFY(this));
1574 no_control_flow = false; break;
1575 case Bytecodes::_anewarray :
1576 verify_anewarray(
1577 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1578 no_control_flow = false; break;
1579 case Bytecodes::_arraylength :
1580 type = current_frame.pop_stack(
1581 VerificationType::reference_check(), CHECK_VERIFY(this));
1582 if (!(type.is_null() || type.is_array())) {
1583 verify_error(ErrorContext::bad_type(
1584 bci, current_frame.stack_top_ctx()),
1585 bad_type_msg, "arraylength");
1586 }
1587 current_frame.push_stack(
1588 VerificationType::integer_type(), CHECK_VERIFY(this));
1589 no_control_flow = false; break;
1590 case Bytecodes::_checkcast :
1591 {
1592 index = bcs.get_index_u2();
1593 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1594 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1595 VerificationType klass_type = cp_index_to_type(
1596 index, cp, CHECK_VERIFY(this));
1597 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1598 no_control_flow = false; break;
1599 }
1600 case Bytecodes::_instanceof : {
1601 index = bcs.get_index_u2();
1602 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1603 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1604 current_frame.push_stack(
1605 VerificationType::integer_type(), CHECK_VERIFY(this));
1606 no_control_flow = false; break;
1607 }
1608 case Bytecodes::_monitorenter :
1609 case Bytecodes::_monitorexit :
1610 current_frame.pop_stack(
1611 VerificationType::reference_check(), CHECK_VERIFY(this));
1612 no_control_flow = false; break;
1613 case Bytecodes::_multianewarray :
1614 {
1615 index = bcs.get_index_u2();
1616 u2 dim = *(bcs.bcp()+3);
1617 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1618 VerificationType new_array_type =
1619 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1620 if (!new_array_type.is_array()) {
1621 verify_error(ErrorContext::bad_type(bci,
1622 TypeOrigin::cp(index, new_array_type)),
1623 "Illegal constant pool index in multianewarray instruction");
1624 return;
1625 }
1626 if (dim < 1 || new_array_type.dimensions() < dim) {
1627 verify_error(ErrorContext::bad_code(bci),
1628 "Illegal dimension in multianewarray instruction: %d", dim);
1629 return;
1630 }
1631 for (int i = 0; i < dim; i++) {
1632 current_frame.pop_stack(
1633 VerificationType::integer_type(), CHECK_VERIFY(this));
1634 }
1635 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1636 no_control_flow = false; break;
1637 }
1638 case Bytecodes::_athrow :
1639 type = VerificationType::reference_type(
1640 vmSymbols::java_lang_Throwable());
1641 current_frame.pop_stack(type, CHECK_VERIFY(this));
1642 no_control_flow = true; break;
1643 default:
1644 // We only need to check the valid bytecodes in class file.
1645 // And jsr and ret are not in the new class file format in JDK1.5.
1646 verify_error(ErrorContext::bad_code(bci),
1647 "Bad instruction: %02x", opcode);
1648 no_control_flow = false;
1649 return;
1650 } // end switch
1651 } // end Merge with the next instruction
1652
1653 // Look for possible jump target in exception handlers and see if it
1654 // matches current_frame
1655 if (bci >= ex_min && bci < ex_max) {
1656 verify_exception_handler_targets(
1657 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1658 }
1659 } // end while
1660
1661 // Make sure that control flow does not fall through end of the method
1662 if (!no_control_flow) {
1663 verify_error(ErrorContext::bad_code(code_length),
1664 "Control flow falls through code end");
1665 return;
1666 }
1667 }
1668
1669 #undef bad_type_message
1670
1671 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1672 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1673 memset(code_data, 0, sizeof(char) * code_length);
1674 RawBytecodeStream bcs(m);
1675
1676 while (!bcs.is_last_bytecode()) {
1677 if (bcs.raw_next() != Bytecodes::_illegal) {
1678 int bci = bcs.bci();
1679 if (bcs.raw_code() == Bytecodes::_new) {
1680 code_data[bci] = NEW_OFFSET;
1681 } else {
1682 code_data[bci] = BYTECODE_OFFSET;
1683 }
1684 } else {
1685 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1686 return NULL;
1687 }
1688 }
1689
1690 return code_data;
1691 }
1692
1693 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1694 ExceptionTable exhandlers(_method());
1695 int exlength = exhandlers.length();
1696 constantPoolHandle cp (THREAD, _method->constants());
1697
1698 for(int i = 0; i < exlength; i++) {
1699 //reacquire the table in case a GC happened
1700 ExceptionTable exhandlers(_method());
1701 u2 start_pc = exhandlers.start_pc(i);
1702 u2 end_pc = exhandlers.end_pc(i);
1703 u2 handler_pc = exhandlers.handler_pc(i);
1704 if (start_pc >= code_length || code_data[start_pc] == 0) {
1705 class_format_error("Illegal exception table start_pc %d", start_pc);
1706 return;
1707 }
1708 if (end_pc != code_length) { // special case: end_pc == code_length
1709 if (end_pc > code_length || code_data[end_pc] == 0) {
1710 class_format_error("Illegal exception table end_pc %d", end_pc);
1711 return;
1712 }
1713 }
1714 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1715 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1716 return;
1717 }
1718 int catch_type_index = exhandlers.catch_type_index(i);
1719 if (catch_type_index != 0) {
1720 VerificationType catch_type = cp_index_to_type(
1721 catch_type_index, cp, CHECK_VERIFY(this));
1722 VerificationType throwable =
1723 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1724 bool is_subclass = throwable.is_assignable_from(
1725 catch_type, this, CHECK_VERIFY(this));
1726 if (!is_subclass) {
1727 // 4286534: should throw VerifyError according to recent spec change
1728 verify_error(ErrorContext::bad_type(handler_pc,
1729 TypeOrigin::cp(catch_type_index, catch_type),
1730 TypeOrigin::implicit(throwable)),
1731 "Catch type is not a subclass "
1732 "of Throwable in exception handler %d", handler_pc);
1733 return;
1734 }
1735 }
1736 if (start_pc < min) min = start_pc;
1737 if (end_pc > max) max = end_pc;
1738 }
1739 }
1740
1741 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1742 int localvariable_table_length = _method()->localvariable_table_length();
1743 if (localvariable_table_length > 0) {
1744 LocalVariableTableElement* table = _method()->localvariable_table_start();
1745 for (int i = 0; i < localvariable_table_length; i++) {
1746 u2 start_bci = table[i].start_bci;
1747 u2 length = table[i].length;
1748
1749 if (start_bci >= code_length || code_data[start_bci] == 0) {
1750 class_format_error(
1751 "Illegal local variable table start_pc %d", start_bci);
1752 return;
1753 }
1754 u4 end_bci = (u4)(start_bci + length);
1755 if (end_bci != code_length) {
1756 if (end_bci >= code_length || code_data[end_bci] == 0) {
1757 class_format_error( "Illegal local variable table length %d", length);
1758 return;
1759 }
1760 }
1761 }
1762 }
1763 }
1764
1765 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1766 StackMapFrame* current_frame,
1767 StackMapTable* stackmap_table,
1768 bool no_control_flow, TRAPS) {
1769 if (stackmap_index < stackmap_table->get_frame_count()) {
1770 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1771 if (no_control_flow && this_offset > bci) {
1772 verify_error(ErrorContext::missing_stackmap(bci),
1773 "Expecting a stack map frame");
1774 return 0;
1775 }
1776 if (this_offset == bci) {
1777 ErrorContext ctx;
1778 // See if current stack map can be assigned to the frame in table.
1779 // current_frame is the stackmap frame got from the last instruction.
1780 // If matched, current_frame will be updated by this method.
1781 bool matches = stackmap_table->match_stackmap(
1782 current_frame, this_offset, stackmap_index,
1783 !no_control_flow, true, &ctx, CHECK_VERIFY_(this, 0));
1784 if (!matches) {
1785 // report type error
1786 verify_error(ctx, "Instruction type does not match stack map");
1787 return 0;
1788 }
1789 stackmap_index++;
1790 } else if (this_offset < bci) {
1791 // current_offset should have met this_offset.
1792 class_format_error("Bad stack map offset %d", this_offset);
1793 return 0;
1794 }
1795 } else if (no_control_flow) {
1796 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1797 return 0;
1798 }
1799 return stackmap_index;
1800 }
1801
1802 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1803 StackMapTable* stackmap_table, TRAPS) {
1804 constantPoolHandle cp (THREAD, _method->constants());
1805 ExceptionTable exhandlers(_method());
1806 int exlength = exhandlers.length();
1807 for(int i = 0; i < exlength; i++) {
1808 //reacquire the table in case a GC happened
1809 ExceptionTable exhandlers(_method());
1810 u2 start_pc = exhandlers.start_pc(i);
1811 u2 end_pc = exhandlers.end_pc(i);
1812 u2 handler_pc = exhandlers.handler_pc(i);
1813 int catch_type_index = exhandlers.catch_type_index(i);
1814 if(bci >= start_pc && bci < end_pc) {
1815 u1 flags = current_frame->flags();
1816 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1817 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1818 if (catch_type_index != 0) {
1819 // We know that this index refers to a subclass of Throwable
1820 VerificationType catch_type = cp_index_to_type(
1821 catch_type_index, cp, CHECK_VERIFY(this));
1822 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1823 } else {
1824 VerificationType throwable =
1825 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1826 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1827 }
1828 ErrorContext ctx;
1829 bool matches = stackmap_table->match_stackmap(
1830 new_frame, handler_pc, true, false, &ctx, CHECK_VERIFY(this));
1831 if (!matches) {
1832 verify_error(ctx, "Stack map does not match the one at "
1833 "exception handler %d", handler_pc);
1834 return;
1835 }
1836 }
1837 }
1838 }
1839
1840 void ClassVerifier::verify_cp_index(
1841 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1842 int nconstants = cp->length();
1843 if ((index <= 0) || (index >= nconstants)) {
1844 verify_error(ErrorContext::bad_cp_index(bci, index),
1845 "Illegal constant pool index %d in class %s",
1846 index, cp->pool_holder()->external_name());
1847 return;
1848 }
1849 }
1850
1851 void ClassVerifier::verify_cp_type(
1852 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1853
1854 // In some situations, bytecode rewriting may occur while we're verifying.
1855 // In this case, a constant pool cache exists and some indices refer to that
1856 // instead. Be sure we don't pick up such indices by accident.
1857 // We must check was_recursively_verified() before we get here.
1858 guarantee(cp->cache() == NULL, "not rewritten yet");
1859
1860 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1861 unsigned int tag = cp->tag_at(index).value();
1862 if ((types & (1 << tag)) == 0) {
1863 verify_error(ErrorContext::bad_cp_index(bci, index),
1864 "Illegal type at constant pool entry %d in class %s",
1865 index, cp->pool_holder()->external_name());
1866 return;
1867 }
1868 }
1869
1870 void ClassVerifier::verify_cp_class_type(
1871 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1872 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1873 constantTag tag = cp->tag_at(index);
1874 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1875 verify_error(ErrorContext::bad_cp_index(bci, index),
1876 "Illegal type at constant pool entry %d in class %s",
1877 index, cp->pool_holder()->external_name());
1878 return;
1879 }
1880 }
1881
1882 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1883 stringStream ss;
1884
1885 ctx.reset_frames();
1886 _exception_type = vmSymbols::java_lang_VerifyError();
1887 _error_context = ctx;
1888 va_list va;
1889 va_start(va, msg);
1890 ss.vprint(msg, va);
1891 va_end(va);
1892 _message = ss.as_string();
1893 #ifdef ASSERT
1894 ResourceMark rm;
1895 const char* exception_name = _exception_type->as_C_string();
1896 Exceptions::debug_check_abort(exception_name, NULL);
1897 #endif // ndef ASSERT
1898 }
1899
1900 void ClassVerifier::class_format_error(const char* msg, ...) {
1901 stringStream ss;
1902 _exception_type = vmSymbols::java_lang_ClassFormatError();
1903 va_list va;
1904 va_start(va, msg);
1905 ss.vprint(msg, va);
1906 va_end(va);
1907 if (!_method.is_null()) {
1908 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1909 }
1910 _message = ss.as_string();
1911 }
1912
1913 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1914 // Get current loader and protection domain first.
1915 oop loader = current_class()->class_loader();
1916 oop protection_domain = current_class()->protection_domain();
1917
1918 return SystemDictionary::resolve_or_fail(
1919 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1920 true, CHECK_NULL);
1921 }
1922
1923 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1924 Klass* target_class,
1925 Symbol* field_name,
1926 Symbol* field_sig,
1927 bool is_method) {
1928 No_Safepoint_Verifier nosafepoint;
1929
1930 // If target class isn't a super class of this class, we don't worry about this case
1931 if (!this_class->is_subclass_of(target_class)) {
1932 return false;
1933 }
1934 // Check if the specified method or field is protected
1935 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1936 fieldDescriptor fd;
1937 if (is_method) {
1938 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::normal);
1939 if (m != NULL && m->is_protected()) {
1940 if (!this_class->is_same_class_package(m->method_holder())) {
1941 return true;
1942 }
1943 }
1944 } else {
1945 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1946 if (member_klass != NULL && fd.is_protected()) {
1947 if (!this_class->is_same_class_package(member_klass)) {
1948 return true;
1949 }
1950 }
1951 }
1952 return false;
1953 }
1954
1955 void ClassVerifier::verify_ldc(
1956 int opcode, u2 index, StackMapFrame* current_frame,
1957 constantPoolHandle cp, u2 bci, TRAPS) {
1958 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1959 constantTag tag = cp->tag_at(index);
1960 unsigned int types;
1961 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1962 if (!tag.is_unresolved_klass()) {
1963 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1964 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1965 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1966 // Note: The class file parser already verified the legality of
1967 // MethodHandle and MethodType constants.
1968 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1969 }
1970 } else {
1971 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1972 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1973 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1974 }
1975 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1976 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1977 } else if (tag.is_string()) {
1978 current_frame->push_stack(
1979 VerificationType::reference_type(
1980 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1981 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1982 current_frame->push_stack(
1983 VerificationType::reference_type(
1984 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
1985 } else if (tag.is_int()) {
1986 current_frame->push_stack(
1987 VerificationType::integer_type(), CHECK_VERIFY(this));
1988 } else if (tag.is_float()) {
1989 current_frame->push_stack(
1990 VerificationType::float_type(), CHECK_VERIFY(this));
1991 } else if (tag.is_double()) {
1992 current_frame->push_stack_2(
1993 VerificationType::double_type(),
1994 VerificationType::double2_type(), CHECK_VERIFY(this));
1995 } else if (tag.is_long()) {
1996 current_frame->push_stack_2(
1997 VerificationType::long_type(),
1998 VerificationType::long2_type(), CHECK_VERIFY(this));
1999 } else if (tag.is_method_handle()) {
2000 current_frame->push_stack(
2001 VerificationType::reference_type(
2002 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2003 } else if (tag.is_method_type()) {
2004 current_frame->push_stack(
2005 VerificationType::reference_type(
2006 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2007 } else {
2008 /* Unreachable? verify_cp_type has already validated the cp type. */
2009 verify_error(
2010 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2011 return;
2012 }
2013 }
2014
2015 void ClassVerifier::verify_switch(
2016 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2017 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2018 int bci = bcs->bci();
2019 address bcp = bcs->bcp();
2020 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2021
2022 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2023 // 4639449 & 4647081: padding bytes must be 0
2024 u2 padding_offset = 1;
2025 while ((bcp + padding_offset) < aligned_bcp) {
2026 if(*(bcp + padding_offset) != 0) {
2027 verify_error(ErrorContext::bad_code(bci),
2028 "Nonzero padding byte in lookupswitch or tableswitch");
2029 return;
2030 }
2031 padding_offset++;
2032 }
2033 }
2034
2035 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2036 int keys, delta;
2037 current_frame->pop_stack(
2038 VerificationType::integer_type(), CHECK_VERIFY(this));
2039 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2040 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2041 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2042 if (low > high) {
2043 verify_error(ErrorContext::bad_code(bci),
2044 "low must be less than or equal to high in tableswitch");
2045 return;
2046 }
2047 keys = high - low + 1;
2048 if (keys < 0) {
2049 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2050 return;
2051 }
2052 delta = 1;
2053 } else {
2054 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2055 if (keys < 0) {
2056 verify_error(ErrorContext::bad_code(bci),
2057 "number of keys in lookupswitch less than 0");
2058 return;
2059 }
2060 delta = 2;
2061 // Make sure that the lookupswitch items are sorted
2062 for (int i = 0; i < (keys - 1); i++) {
2063 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2064 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2065 if (this_key >= next_key) {
2066 verify_error(ErrorContext::bad_code(bci),
2067 "Bad lookupswitch instruction");
2068 return;
2069 }
2070 }
2071 }
2072 int target = bci + default_offset;
2073 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2074 for (int i = 0; i < keys; i++) {
2075 // Because check_jump_target() may safepoint, the bytecode could have
2076 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2077 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2078 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2079 stackmap_table->check_jump_target(
2080 current_frame, target, CHECK_VERIFY(this));
2081 }
2082 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2083 }
2084
2085 bool ClassVerifier::name_in_supers(
2086 Symbol* ref_name, instanceKlassHandle current) {
2087 Klass* super = current->super();
2088 while (super != NULL) {
2089 if (super->name() == ref_name) {
2090 return true;
2091 }
2092 super = super->super();
2093 }
2094 return false;
2095 }
2096
2097 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2098 StackMapFrame* current_frame,
2099 constantPoolHandle cp,
2100 TRAPS) {
2101 u2 index = bcs->get_index_u2();
2102 verify_cp_type(bcs->bci(), index, cp,
2103 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2104
2105 // Get field name and signature
2106 Symbol* field_name = cp->name_ref_at(index);
2107 Symbol* field_sig = cp->signature_ref_at(index);
2108
2109 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2110 class_format_error(
2111 "Invalid signature for field in class %s referenced "
2112 "from constant pool index %d", _klass->external_name(), index);
2113 return;
2114 }
2115
2116 // Get referenced class type
2117 VerificationType ref_class_type = cp_ref_index_to_type(
2118 index, cp, CHECK_VERIFY(this));
2119 if (!ref_class_type.is_object()) {
2120 /* Unreachable? Class file parser verifies Fieldref contents */
2121 verify_error(ErrorContext::bad_type(bcs->bci(),
2122 TypeOrigin::cp(index, ref_class_type)),
2123 "Expecting reference to class in class %s at constant pool index %d",
2124 _klass->external_name(), index);
2125 return;
2126 }
2127 VerificationType target_class_type = ref_class_type;
2128
2129 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2130 "buffer type must match VerificationType size");
2131 uintptr_t field_type_buffer[2];
2132 VerificationType* field_type = (VerificationType*)field_type_buffer;
2133 // If we make a VerificationType[2] array directly, the compiler calls
2134 // to the c-runtime library to do the allocation instead of just
2135 // stack allocating it. Plus it would run constructors. This shows up
2136 // in performance profiles.
2137
2138 SignatureStream sig_stream(field_sig, false);
2139 VerificationType stack_object_type;
2140 int n = change_sig_to_verificationType(
2141 &sig_stream, field_type, CHECK_VERIFY(this));
2142 u2 bci = bcs->bci();
2143 bool is_assignable;
2144 switch (bcs->raw_code()) {
2145 case Bytecodes::_getstatic: {
2146 for (int i = 0; i < n; i++) {
2147 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2148 }
2149 break;
2150 }
2151 case Bytecodes::_putstatic: {
2152 for (int i = n - 1; i >= 0; i--) {
2153 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2154 }
2155 break;
2156 }
2157 case Bytecodes::_getfield: {
2158 stack_object_type = current_frame->pop_stack(
2159 target_class_type, CHECK_VERIFY(this));
2160 for (int i = 0; i < n; i++) {
2161 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2162 }
2163 goto check_protected;
2164 }
2165 case Bytecodes::_putfield: {
2166 for (int i = n - 1; i >= 0; i--) {
2167 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2168 }
2169 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2170
2171 // The JVMS 2nd edition allows field initialization before the superclass
2172 // initializer, if the field is defined within the current class.
2173 fieldDescriptor fd;
2174 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2175 target_class_type.equals(current_type()) &&
2176 _klass->find_local_field(field_name, field_sig, &fd)) {
2177 stack_object_type = current_type();
2178 }
2179 is_assignable = target_class_type.is_assignable_from(
2180 stack_object_type, this, CHECK_VERIFY(this));
2181 if (!is_assignable) {
2182 verify_error(ErrorContext::bad_type(bci,
2183 current_frame->stack_top_ctx(),
2184 TypeOrigin::cp(index, target_class_type)),
2185 "Bad type on operand stack in putfield");
2186 return;
2187 }
2188 }
2189 check_protected: {
2190 if (_this_type == stack_object_type)
2191 break; // stack_object_type must be assignable to _current_class_type
2192 Symbol* ref_class_name =
2193 cp->klass_name_at(cp->klass_ref_index_at(index));
2194 if (!name_in_supers(ref_class_name, current_class()))
2195 // stack_object_type must be assignable to _current_class_type since:
2196 // 1. stack_object_type must be assignable to ref_class.
2197 // 2. ref_class must be _current_class or a subclass of it. It can't
2198 // be a superclass of it. See revised JVMS 5.4.4.
2199 break;
2200
2201 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2202 if (is_protected_access(current_class(), ref_class_oop, field_name,
2203 field_sig, false)) {
2204 // It's protected access, check if stack object is assignable to
2205 // current class.
2206 is_assignable = current_type().is_assignable_from(
2207 stack_object_type, this, CHECK_VERIFY(this));
2208 if (!is_assignable) {
2209 verify_error(ErrorContext::bad_type(bci,
2210 current_frame->stack_top_ctx(),
2211 TypeOrigin::implicit(current_type())),
2212 "Bad access to protected data in getfield");
2213 return;
2214 }
2215 }
2216 break;
2217 }
2218 default: ShouldNotReachHere();
2219 }
2220 }
2221
2222 // Return TRUE if all code paths in the bytecode interval end in athrow.
2223 bool ClassVerifier::ends_in_athrow(u4 start_bc_offset, u4 end_bc_offset) {
2224 // Create bytecode stream.
2225 RawBytecodeStream bcs(method());
2226 bcs.set_interval(start_bc_offset, end_bc_offset);
2227 u4 code_length = method()->code_size();
2228 u4 target;
2229 // Create stack for storing bytecode intervals for if*, goto*, and *switch.
2230 GrowableArray<u4>* bci_stack = new GrowableArray<u4>(50);
2231
2232 while (true) {
2233 if (bcs.is_last_bytecode()) {
2234 if (bci_stack->is_empty()) {
2235 return false;
2236 } else {
2237 // Pop a bytecode interval and scan that interval.
2238 u4 end_offset = pop_bci_end_offset(bci_stack);
2239 u4 start_offset = pop_bci_start_offset(bci_stack);
2240 assert(end_offset >= start_offset, "Messed up bytecode offsets");
2241 bcs.set_interval(start_offset, end_offset);
2242 }
2243 }
2244 Bytecodes::Code opcode = bcs.raw_next();
2245 u4 bci = bcs.bci();
2246
2247 switch (opcode) {
2248 case Bytecodes::_if_icmpeq:
2249 case Bytecodes::_if_icmpne:
2250 case Bytecodes::_if_icmplt:
2251 case Bytecodes::_if_icmpge:
2252 case Bytecodes::_if_icmpgt:
2253 case Bytecodes::_if_icmple:
2254 case Bytecodes::_ifeq:
2255 case Bytecodes::_ifne:
2256 case Bytecodes::_iflt:
2257 case Bytecodes::_ifge:
2258 case Bytecodes::_ifgt:
2259 case Bytecodes::_ifle:
2260 case Bytecodes::_if_acmpeq:
2261 case Bytecodes::_if_acmpne:
2262 case Bytecodes::_ifnull:
2263 case Bytecodes::_ifnonnull:
2264 target = bcs.dest();
2265 if (target > bci) { // forward branch
2266 if (target >= code_length) return false;
2267 // Push the branch target interval onto the stack.
2268 push_bci_offsets(bci_stack, target, bcs.end_bci());
2269 // then, scan bytecodes up to the target.
2270 bcs.set_interval(bcs.next_bci(), target);
2271
2272 } else { // backward branch
2273 // Push the interval following the backward branch onto the stack.
2274 push_bci_offsets(bci_stack, bcs.next_bci(), bcs.end_bci());
2275 // Check bytecodes between the branch target and the current offset.
2276 bcs.set_interval(target, bci);
2277 }
2278 break;
2279
2280 case Bytecodes::_goto:
2281 case Bytecodes::_goto_w:
2282 target = (opcode == Bytecodes::_goto ? bcs.dest() : bcs.dest_w());
2283 if (target > bci) { // forward branch
2284 if (target >= code_length) return false;
2285 bcs.set_interval(target, code_length);
2286
2287 } else { // backward branch
2288 // Push the interval following the backward branch onto the stack.
2289 push_bci_offsets(bci_stack, bcs.next_bci(), bcs.end_bci());
2290 // Check bytecodes between the branch target and the current offset.
2291 bcs.set_interval(target, bci);
2292 }
2293 break;
2294
2295 // Check that all switch alternatives end in 'athrow' bytecodes. Since it
2296 // is difficult to determine where each switch alternative ends, parse
2297 // each switch alternative until either hit a 'return', 'athrow', or reach
2298 // the end of the method's bytecodes. This is gross but should be okay
2299 // because:
2300 // 1. tableswitch and lookupswitch byte codes in handlers for ctor explicit
2301 // constructor invocations should be rare.
2302 // 2. if each switch alternative ends in an athrow then the parsing should be
2303 // short. If there is no athrow then it is bogus code, anyway.
2304 case Bytecodes::_lookupswitch:
2305 case Bytecodes::_tableswitch:
2306 {
2307 address aligned_bcp = (address) round_to((intptr_t)(bcs.bcp() + 1), jintSize);
2308 u4 default_offset = Bytes::get_Java_u4(aligned_bcp) + bci;
2309 int keys, delta;
2310 if (opcode == Bytecodes::_tableswitch) {
2311 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2312 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2313 // This is invalid, but let the regular bytecode verifier
2314 // report this because the user will get a better error message.
2315 if (low > high) return true;
2316 keys = high - low + 1;
2317 delta = 1;
2318 } else {
2319 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2320 delta = 2;
2321 }
2322 // Invalid, let the regular bytecode verifier deal with it.
2323 if (keys < 0) return true;
2324
2325 // Push the current state onto the stack.
2326 push_bci_offsets(bci_stack, bcs.next_bci(), bcs.end_bci());
2327
2328 // Push the switch alternatives onto the stack.
2329 for (int i = 0; i < keys; i++) {
2330 u4 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2331 if (target > code_length) return false;
2332 push_bci_offsets(bci_stack, target, code_length);
2333 }
2334
2335 // Start bytecode parsing for the switch at the default alternative.
2336 if (default_offset > code_length) return false;
2337 bcs.set_interval(default_offset, code_length);
2338 break;
2339 }
2340
2341 case Bytecodes::_return:
2342 return false;
2343
2344 case Bytecodes::_athrow:
2345 if (bci_stack->is_empty()) {
2346 return true;
2347 } else {
2348 // Pop a bytecode interval and scan that interval.
2349 u4 end_offset = pop_bci_end_offset(bci_stack);
2350 u4 start_offset = pop_bci_start_offset(bci_stack);
2351 assert(end_offset >= start_offset, "Mixed up bytecode offsets");
2352 bcs.set_interval(start_offset, end_offset);
2353 break;
2354 }
2355
2356 default:
2357 ;
2358 } // end switch
2359 } // end while loop
2360
2361 return false;
2362 }
2363
2364 void ClassVerifier::verify_invoke_init(
2365 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2366 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2367 constantPoolHandle cp, TRAPS) {
2368 u2 bci = bcs->bci();
2369 VerificationType type = current_frame->pop_stack(
2370 VerificationType::reference_check(), CHECK_VERIFY(this));
2371 if (type == VerificationType::uninitialized_this_type()) {
2372 // The method must be an <init> method of this class or its superclass
2373 Klass* superk = current_class()->super();
2374 if (ref_class_type.name() != current_class()->name() &&
2375 ref_class_type.name() != superk->name()) {
2376 verify_error(ErrorContext::bad_type(bci,
2377 TypeOrigin::implicit(ref_class_type),
2378 TypeOrigin::implicit(current_type())),
2379 "Bad <init> method call");
2380 return;
2381 }
2382
2383 // Make sure that this call is not jumped over.
2384 if (bci < furthest_jump()) {
2385 verify_error(ErrorContext::bad_code(bci),
2386 "Bad <init> method call from inside of a branch");
2387 return;
2388 }
2389
2390 // Check if this call is done from inside of a TRY block. If so, make
2391 // sure that all catch clause paths end in a throw. Otherwise, this
2392 // can result in returning an incomplete object.
2393 ExceptionTable exhandlers(_method());
2394 int exlength = exhandlers.length();
2395 for(int i = 0; i < exlength; i++) {
2396 u2 start_pc = exhandlers.start_pc(i);
2397 u2 end_pc = exhandlers.end_pc(i);
2398
2399 if (bci >= start_pc && bci < end_pc) {
2400 if (!ends_in_athrow(exhandlers.handler_pc(i), code_length)) {
2401 verify_error(ErrorContext::bad_code(bci),
2402 "Bad <init> method call from after the start of a try block");
2403 return;
2404 } else if (VerboseVerification) {
2405 ResourceMark rm;
2406 tty->print_cr(
2407 "Survived call to ends_in_athrow(): %s",
2408 current_class()->name()->as_C_string());
2409 }
2410 }
2411 }
2412
2413 current_frame->initialize_object(type, current_type());
2414 *this_uninit = true;
2415 } else if (type.is_uninitialized()) {
2416 u2 new_offset = type.bci();
2417 address new_bcp = bcs->bcp() - bci + new_offset;
2418 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2419 /* Unreachable? Stack map parsing ensures valid type and new
2420 * instructions have a valid BCI. */
2421 verify_error(ErrorContext::bad_code(new_offset),
2422 "Expecting new instruction");
2423 return;
2424 }
2425 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2426 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2427
2428 // The method must be an <init> method of the indicated class
2429 VerificationType new_class_type = cp_index_to_type(
2430 new_class_index, cp, CHECK_VERIFY(this));
2431 if (!new_class_type.equals(ref_class_type)) {
2432 verify_error(ErrorContext::bad_type(bci,
2433 TypeOrigin::cp(new_class_index, new_class_type),
2434 TypeOrigin::cp(ref_class_index, ref_class_type)),
2435 "Call to wrong <init> method");
2436 return;
2437 }
2438 // According to the VM spec, if the referent class is a superclass of the
2439 // current class, and is in a different runtime package, and the method is
2440 // protected, then the objectref must be the current class or a subclass
2441 // of the current class.
2442 VerificationType objectref_type = new_class_type;
2443 if (name_in_supers(ref_class_type.name(), current_class())) {
2444 Klass* ref_klass = load_class(
2445 ref_class_type.name(), CHECK_VERIFY(this));
2446 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2447 vmSymbols::object_initializer_name(),
2448 cp->signature_ref_at(bcs->get_index_u2()),
2449 Klass::normal);
2450 // Do nothing if method is not found. Let resolution detect the error.
2451 if (m != NULL) {
2452 instanceKlassHandle mh(THREAD, m->method_holder());
2453 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2454 bool assignable = current_type().is_assignable_from(
2455 objectref_type, this, CHECK_VERIFY(this));
2456 if (!assignable) {
2457 verify_error(ErrorContext::bad_type(bci,
2458 TypeOrigin::cp(new_class_index, objectref_type),
2459 TypeOrigin::implicit(current_type())),
2460 "Bad access to protected <init> method");
2461 return;
2462 }
2463 }
2464 }
2465 }
2466 current_frame->initialize_object(type, new_class_type);
2467 } else {
2468 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2469 "Bad operand type when invoking <init>");
2470 return;
2471 }
2472 }
2473
2474 bool ClassVerifier::is_same_or_direct_interface(
2475 instanceKlassHandle klass,
2476 VerificationType klass_type,
2477 VerificationType ref_class_type) {
2478 if (ref_class_type.equals(klass_type)) return true;
2479 Array<Klass*>* local_interfaces = klass->local_interfaces();
2480 if (local_interfaces != NULL) {
2481 for (int x = 0; x < local_interfaces->length(); x++) {
2482 Klass* k = local_interfaces->at(x);
2483 assert (k != NULL && k->is_interface(), "invalid interface");
2484 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2485 return true;
2486 }
2487 }
2488 }
2489 return false;
2490 }
2491
2492 void ClassVerifier::verify_invoke_instructions(
2493 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2494 bool *this_uninit, VerificationType return_type,
2495 constantPoolHandle cp, TRAPS) {
2496 // Make sure the constant pool item is the right type
2497 u2 index = bcs->get_index_u2();
2498 Bytecodes::Code opcode = bcs->raw_code();
2499 unsigned int types;
2500 switch (opcode) {
2501 case Bytecodes::_invokeinterface:
2502 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2503 break;
2504 case Bytecodes::_invokedynamic:
2505 types = 1 << JVM_CONSTANT_InvokeDynamic;
2506 break;
2507 case Bytecodes::_invokespecial:
2508 case Bytecodes::_invokestatic:
2509 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2510 (1 << JVM_CONSTANT_Methodref) :
2511 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2512 break;
2513 default:
2514 types = 1 << JVM_CONSTANT_Methodref;
2515 }
2516 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2517
2518 // Get method name and signature
2519 Symbol* method_name = cp->name_ref_at(index);
2520 Symbol* method_sig = cp->signature_ref_at(index);
2521
2522 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2523 class_format_error(
2524 "Invalid method signature in class %s referenced "
2525 "from constant pool index %d", _klass->external_name(), index);
2526 return;
2527 }
2528
2529 // Get referenced class type
2530 VerificationType ref_class_type;
2531 if (opcode == Bytecodes::_invokedynamic) {
2532 if (_klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2533 class_format_error(
2534 "invokedynamic instructions not supported by this class file version (%d), class %s",
2535 _klass->major_version(), _klass->external_name());
2536 return;
2537 }
2538 } else {
2539 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2540 }
2541
2542 // For a small signature length, we just allocate 128 bytes instead
2543 // of parsing the signature once to find its size.
2544 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2545 // longs/doubles to be consertive.
2546 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2547 "buffer type must match VerificationType size");
2548 uintptr_t on_stack_sig_types_buffer[128];
2549 // If we make a VerificationType[128] array directly, the compiler calls
2550 // to the c-runtime library to do the allocation instead of just
2551 // stack allocating it. Plus it would run constructors. This shows up
2552 // in performance profiles.
2553
2554 VerificationType* sig_types;
2555 int size = (method_sig->utf8_length() - 3) * 2;
2556 if (size > 128) {
2557 // Long and double occupies two slots here.
2558 ArgumentSizeComputer size_it(method_sig);
2559 size = size_it.size();
2560 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2561 } else{
2562 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2563 }
2564 SignatureStream sig_stream(method_sig);
2565 int sig_i = 0;
2566 while (!sig_stream.at_return_type()) {
2567 sig_i += change_sig_to_verificationType(
2568 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2569 sig_stream.next();
2570 }
2571 int nargs = sig_i;
2572
2573 #ifdef ASSERT
2574 {
2575 ArgumentSizeComputer size_it(method_sig);
2576 assert(nargs == size_it.size(), "Argument sizes do not match");
2577 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2578 }
2579 #endif
2580
2581 // Check instruction operands
2582 u2 bci = bcs->bci();
2583 if (opcode == Bytecodes::_invokeinterface) {
2584 address bcp = bcs->bcp();
2585 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2586 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2587 // the difference between the size of the operand stack before and after the instruction
2588 // executes.
2589 if (*(bcp+3) != (nargs+1)) {
2590 verify_error(ErrorContext::bad_code(bci),
2591 "Inconsistent args count operand in invokeinterface");
2592 return;
2593 }
2594 if (*(bcp+4) != 0) {
2595 verify_error(ErrorContext::bad_code(bci),
2596 "Fourth operand byte of invokeinterface must be zero");
2597 return;
2598 }
2599 }
2600
2601 if (opcode == Bytecodes::_invokedynamic) {
2602 address bcp = bcs->bcp();
2603 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2604 verify_error(ErrorContext::bad_code(bci),
2605 "Third and fourth operand bytes of invokedynamic must be zero");
2606 return;
2607 }
2608 }
2609
2610 if (method_name->byte_at(0) == '<') {
2611 // Make sure <init> can only be invoked by invokespecial
2612 if (opcode != Bytecodes::_invokespecial ||
2613 method_name != vmSymbols::object_initializer_name()) {
2614 verify_error(ErrorContext::bad_code(bci),
2615 "Illegal call to internal method");
2616 return;
2617 }
2618 } else if (opcode == Bytecodes::_invokespecial
2619 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2620 && !ref_class_type.equals(VerificationType::reference_type(
2621 current_class()->super()->name()))) {
2622 bool subtype = false;
2623 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2624 if (!current_class()->is_anonymous()) {
2625 subtype = ref_class_type.is_assignable_from(
2626 current_type(), this, CHECK_VERIFY(this));
2627 } else {
2628 VerificationType host_klass_type =
2629 VerificationType::reference_type(current_class()->host_klass()->name());
2630 subtype = ref_class_type.is_assignable_from(host_klass_type, this, CHECK_VERIFY(this));
2631
2632 // If invokespecial of IMR, need to recheck for same or
2633 // direct interface relative to the host class
2634 have_imr_indirect = (have_imr_indirect &&
2635 !is_same_or_direct_interface(
2636 InstanceKlass::cast(current_class()->host_klass()),
2637 host_klass_type, ref_class_type));
2638 }
2639 if (!subtype) {
2640 verify_error(ErrorContext::bad_code(bci),
2641 "Bad invokespecial instruction: "
2642 "current class isn't assignable to reference class.");
2643 return;
2644 } else if (have_imr_indirect) {
2645 verify_error(ErrorContext::bad_code(bci),
2646 "Bad invokespecial instruction: "
2647 "interface method reference is in an indirect superinterface.");
2648 return;
2649 }
2650
2651 }
2652 // Match method descriptor with operand stack
2653 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2654 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2655 }
2656 // Check objectref on operand stack
2657 if (opcode != Bytecodes::_invokestatic &&
2658 opcode != Bytecodes::_invokedynamic) {
2659 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2660 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2661 code_length, this_uninit, cp, CHECK_VERIFY(this));
2662 } else { // other methods
2663 // Ensures that target class is assignable to method class.
2664 if (opcode == Bytecodes::_invokespecial) {
2665 if (!current_class()->is_anonymous()) {
2666 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2667 } else {
2668 // anonymous class invokespecial calls: check if the
2669 // objectref is a subtype of the host_klass of the current class
2670 // to allow an anonymous class to reference methods in the host_klass
2671 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2672 VerificationType hosttype =
2673 VerificationType::reference_type(current_class()->host_klass()->name());
2674 bool subtype = hosttype.is_assignable_from(top, this, CHECK_VERIFY(this));
2675 if (!subtype) {
2676 verify_error( ErrorContext::bad_type(current_frame->offset(),
2677 current_frame->stack_top_ctx(),
2678 TypeOrigin::implicit(top)),
2679 "Bad type on operand stack");
2680 return;
2681 }
2682 }
2683 } else if (opcode == Bytecodes::_invokevirtual) {
2684 VerificationType stack_object_type =
2685 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2686 if (current_type() != stack_object_type) {
2687 assert(cp->cache() == NULL, "not rewritten yet");
2688 Symbol* ref_class_name =
2689 cp->klass_name_at(cp->klass_ref_index_at(index));
2690 // See the comments in verify_field_instructions() for
2691 // the rationale behind this.
2692 if (name_in_supers(ref_class_name, current_class())) {
2693 Klass* ref_class = load_class(ref_class_name, CHECK);
2694 if (is_protected_access(
2695 _klass, ref_class, method_name, method_sig, true)) {
2696 // It's protected access, check if stack object is
2697 // assignable to current class.
2698 bool is_assignable = current_type().is_assignable_from(
2699 stack_object_type, this, CHECK_VERIFY(this));
2700 if (!is_assignable) {
2701 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2702 && stack_object_type.is_array()
2703 && method_name == vmSymbols::clone_name()) {
2704 // Special case: arrays pretend to implement public Object
2705 // clone().
2706 } else {
2707 verify_error(ErrorContext::bad_type(bci,
2708 current_frame->stack_top_ctx(),
2709 TypeOrigin::implicit(current_type())),
2710 "Bad access to protected data in invokevirtual");
2711 return;
2712 }
2713 }
2714 }
2715 }
2716 }
2717 } else {
2718 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2719 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2720 }
2721 }
2722 }
2723 // Push the result type.
2724 if (sig_stream.type() != T_VOID) {
2725 if (method_name == vmSymbols::object_initializer_name()) {
2726 // <init> method must have a void return type
2727 /* Unreachable? Class file parser verifies that methods with '<' have
2728 * void return */
2729 verify_error(ErrorContext::bad_code(bci),
2730 "Return type must be void in <init> method");
2731 return;
2732 }
2733 VerificationType return_type[2];
2734 int n = change_sig_to_verificationType(
2735 &sig_stream, return_type, CHECK_VERIFY(this));
2736 for (int i = 0; i < n; i++) {
2737 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2738 }
2739 }
2740 }
2741
2742 VerificationType ClassVerifier::get_newarray_type(
2743 u2 index, u2 bci, TRAPS) {
2744 const char* from_bt[] = {
2745 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2746 };
2747 if (index < T_BOOLEAN || index > T_LONG) {
2748 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2749 return VerificationType::bogus_type();
2750 }
2751
2752 // from_bt[index] contains the array signature which has a length of 2
2753 Symbol* sig = create_temporary_symbol(
2754 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2755 return VerificationType::reference_type(sig);
2756 }
2757
2758 void ClassVerifier::verify_anewarray(
2759 u2 bci, u2 index, constantPoolHandle cp,
2760 StackMapFrame* current_frame, TRAPS) {
2761 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2762 current_frame->pop_stack(
2763 VerificationType::integer_type(), CHECK_VERIFY(this));
2764
2765 VerificationType component_type =
2766 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2767 int length;
2768 char* arr_sig_str;
2769 if (component_type.is_array()) { // it's an array
2770 const char* component_name = component_type.name()->as_utf8();
2771 // add one dimension to component
2772 length = (int)strlen(component_name) + 1;
2773 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2774 arr_sig_str[0] = '[';
2775 strncpy(&arr_sig_str[1], component_name, length - 1);
2776 } else { // it's an object or interface
2777 const char* component_name = component_type.name()->as_utf8();
2778 // add one dimension to component with 'L' prepended and ';' postpended.
2779 length = (int)strlen(component_name) + 3;
2780 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2781 arr_sig_str[0] = '[';
2782 arr_sig_str[1] = 'L';
2783 strncpy(&arr_sig_str[2], component_name, length - 2);
2784 arr_sig_str[length - 1] = ';';
2785 }
2786 Symbol* arr_sig = create_temporary_symbol(
2787 arr_sig_str, length, CHECK_VERIFY(this));
2788 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2789 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2790 }
2791
2792 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2793 current_frame->get_local(
2794 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2795 current_frame->push_stack(
2796 VerificationType::integer_type(), CHECK_VERIFY(this));
2797 }
2798
2799 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2800 current_frame->get_local_2(
2801 index, VerificationType::long_type(),
2802 VerificationType::long2_type(), CHECK_VERIFY(this));
2803 current_frame->push_stack_2(
2804 VerificationType::long_type(),
2805 VerificationType::long2_type(), CHECK_VERIFY(this));
2806 }
2807
2808 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2809 current_frame->get_local(
2810 index, VerificationType::float_type(), CHECK_VERIFY(this));
2811 current_frame->push_stack(
2812 VerificationType::float_type(), CHECK_VERIFY(this));
2813 }
2814
2815 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2816 current_frame->get_local_2(
2817 index, VerificationType::double_type(),
2818 VerificationType::double2_type(), CHECK_VERIFY(this));
2819 current_frame->push_stack_2(
2820 VerificationType::double_type(),
2821 VerificationType::double2_type(), CHECK_VERIFY(this));
2822 }
2823
2824 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2825 VerificationType type = current_frame->get_local(
2826 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2827 current_frame->push_stack(type, CHECK_VERIFY(this));
2828 }
2829
2830 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2831 current_frame->pop_stack(
2832 VerificationType::integer_type(), CHECK_VERIFY(this));
2833 current_frame->set_local(
2834 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2835 }
2836
2837 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2838 current_frame->pop_stack_2(
2839 VerificationType::long2_type(),
2840 VerificationType::long_type(), CHECK_VERIFY(this));
2841 current_frame->set_local_2(
2842 index, VerificationType::long_type(),
2843 VerificationType::long2_type(), CHECK_VERIFY(this));
2844 }
2845
2846 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2847 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2848 current_frame->set_local(
2849 index, VerificationType::float_type(), CHECK_VERIFY(this));
2850 }
2851
2852 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2853 current_frame->pop_stack_2(
2854 VerificationType::double2_type(),
2855 VerificationType::double_type(), CHECK_VERIFY(this));
2856 current_frame->set_local_2(
2857 index, VerificationType::double_type(),
2858 VerificationType::double2_type(), CHECK_VERIFY(this));
2859 }
2860
2861 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2862 VerificationType type = current_frame->pop_stack(
2863 VerificationType::reference_check(), CHECK_VERIFY(this));
2864 current_frame->set_local(index, type, CHECK_VERIFY(this));
2865 }
2866
2867 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2868 VerificationType type = current_frame->get_local(
2869 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2870 current_frame->set_local(index, type, CHECK_VERIFY(this));
2871 }
2872
2873 void ClassVerifier::verify_return_value(
2874 VerificationType return_type, VerificationType type, u2 bci,
2875 StackMapFrame* current_frame, TRAPS) {
2876 if (return_type == VerificationType::bogus_type()) {
2877 verify_error(ErrorContext::bad_type(bci,
2878 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2879 "Method expects a return value");
2880 return;
2881 }
2882 bool match = return_type.is_assignable_from(type, this, CHECK_VERIFY(this));
2883 if (!match) {
2884 verify_error(ErrorContext::bad_type(bci,
2885 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2886 "Bad return type");
2887 return;
2888 }
2889 }
2890
2891 // The verifier creates symbols which are substrings of Symbols.
2892 // These are stored in the verifier until the end of verification so that
2893 // they can be reference counted.
2894 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2895 int end, TRAPS) {
2896 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2897 _symbols->push(sym);
2898 return sym;
2899 }
2900
2901 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2902 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2903 _symbols->push(sym);
2904 return sym;
2905 }