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src/share/vm/classfile/verifier.cpp@da91efe96a93
src/share/vm/classfile/verifier.cpp
Sat, 01 Sep 2012 13:25:18 -0400
- author
- coleenp
- date
- Sat, 01 Sep 2012 13:25:18 -0400
- changeset 4037
- da91efe96a93
- parent 3995
- fce6d7280776
- child 4245
- 4735d2c84362
- permissions
- -rw-r--r--
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
1 /*
2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/stackMapTable.hpp"
29 #include "classfile/stackMapFrame.hpp"
30 #include "classfile/stackMapTableFormat.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/bytecodeStream.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "oops/typeArrayOop.hpp"
41 #include "prims/jvm.h"
42 #include "runtime/fieldDescriptor.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/orderAccess.hpp"
47 #include "runtime/os.hpp"
48 #ifdef TARGET_ARCH_x86
49 # include "bytes_x86.hpp"
50 #endif
51 #ifdef TARGET_ARCH_sparc
52 # include "bytes_sparc.hpp"
53 #endif
54 #ifdef TARGET_ARCH_zero
55 # include "bytes_zero.hpp"
56 #endif
57 #ifdef TARGET_ARCH_arm
58 # include "bytes_arm.hpp"
59 #endif
60 #ifdef TARGET_ARCH_ppc
61 # include "bytes_ppc.hpp"
62 #endif
64 #define NOFAILOVER_MAJOR_VERSION 51
66 // Access to external entry for VerifyClassCodes - old byte code verifier
68 extern "C" {
69 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
70 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
71 }
73 static void* volatile _verify_byte_codes_fn = NULL;
75 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
77 static void* verify_byte_codes_fn() {
78 if (_verify_byte_codes_fn == NULL) {
79 void *lib_handle = os::native_java_library();
80 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
81 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
82 if (func == NULL) {
83 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
84 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
85 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
86 }
87 }
88 return (void*)_verify_byte_codes_fn;
89 }
92 // Methods in Verifier
94 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
95 return (class_loader == NULL || !should_verify_class) ?
96 BytecodeVerificationLocal : BytecodeVerificationRemote;
97 }
99 bool Verifier::relax_verify_for(oop loader) {
100 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
101 bool need_verify =
102 // verifyAll
103 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
104 // verifyRemote
105 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
106 return !need_verify;
107 }
109 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
110 HandleMark hm;
111 ResourceMark rm(THREAD);
113 Symbol* exception_name = NULL;
114 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
115 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
116 char* exception_message = message_buffer;
118 const char* klassName = klass->external_name();
119 bool can_failover = FailOverToOldVerifier &&
120 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
122 // If the class should be verified, first see if we can use the split
123 // verifier. If not, or if verification fails and FailOverToOldVerifier
124 // is set, then call the inference verifier.
125 if (is_eligible_for_verification(klass, should_verify_class)) {
126 if (TraceClassInitialization) {
127 tty->print_cr("Start class verification for: %s", klassName);
128 }
129 if (UseSplitVerifier &&
130 klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
131 ClassVerifier split_verifier(klass, THREAD);
132 split_verifier.verify_class(THREAD);
133 exception_name = split_verifier.result();
134 if (can_failover && !HAS_PENDING_EXCEPTION &&
135 (exception_name == vmSymbols::java_lang_VerifyError() ||
136 exception_name == vmSymbols::java_lang_ClassFormatError())) {
137 if (TraceClassInitialization || VerboseVerification) {
138 tty->print_cr(
139 "Fail over class verification to old verifier for: %s", klassName);
140 }
141 exception_name = inference_verify(
142 klass, message_buffer, message_buffer_len, THREAD);
143 }
144 if (exception_name != NULL) {
145 exception_message = split_verifier.exception_message();
146 }
147 } else {
148 exception_name = inference_verify(
149 klass, message_buffer, message_buffer_len, THREAD);
150 }
152 if (TraceClassInitialization || VerboseVerification) {
153 if (HAS_PENDING_EXCEPTION) {
154 tty->print("Verification for %s has", klassName);
155 tty->print_cr(" exception pending %s ",
156 InstanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
157 } else if (exception_name != NULL) {
158 tty->print_cr("Verification for %s failed", klassName);
159 }
160 tty->print_cr("End class verification for: %s", klassName);
161 }
162 }
164 if (HAS_PENDING_EXCEPTION) {
165 return false; // use the existing exception
166 } else if (exception_name == NULL) {
167 return true; // verifcation succeeded
168 } else { // VerifyError or ClassFormatError to be created and thrown
169 ResourceMark rm(THREAD);
170 instanceKlassHandle kls =
171 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
172 while (!kls.is_null()) {
173 if (kls == klass) {
174 // If the class being verified is the exception we're creating
175 // or one of it's superclasses, we're in trouble and are going
176 // to infinitely recurse when we try to initialize the exception.
177 // So bail out here by throwing the preallocated VM error.
178 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
179 }
180 kls = kls->super();
181 }
182 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
183 THROW_MSG_(exception_name, exception_message, false);
184 }
185 }
187 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
188 Symbol* name = klass->name();
189 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
191 return (should_verify_for(klass->class_loader(), should_verify_class) &&
192 // return if the class is a bootstrapping class
193 // or defineClass specified not to verify by default (flags override passed arg)
194 // We need to skip the following four for bootstraping
195 name != vmSymbols::java_lang_Object() &&
196 name != vmSymbols::java_lang_Class() &&
197 name != vmSymbols::java_lang_String() &&
198 name != vmSymbols::java_lang_Throwable() &&
200 // Can not verify the bytecodes for shared classes because they have
201 // already been rewritten to contain constant pool cache indices,
202 // which the verifier can't understand.
203 // Shared classes shouldn't have stackmaps either.
204 !klass()->is_shared() &&
206 // As of the fix for 4486457 we disable verification for all of the
207 // dynamically-generated bytecodes associated with the 1.4
208 // reflection implementation, not just those associated with
209 // sun/reflect/SerializationConstructorAccessor.
210 // NOTE: this is called too early in the bootstrapping process to be
211 // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.
212 (refl_magic_klass == NULL ||
213 !klass->is_subtype_of(refl_magic_klass) ||
214 VerifyReflectionBytecodes)
215 );
216 }
218 Symbol* Verifier::inference_verify(
219 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
220 JavaThread* thread = (JavaThread*)THREAD;
221 JNIEnv *env = thread->jni_environment();
223 void* verify_func = verify_byte_codes_fn();
225 if (verify_func == NULL) {
226 jio_snprintf(message, message_len, "Could not link verifier");
227 return vmSymbols::java_lang_VerifyError();
228 }
230 ResourceMark rm(THREAD);
231 if (VerboseVerification) {
232 tty->print_cr("Verifying class %s with old format", klass->external_name());
233 }
235 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
236 jint result;
238 {
239 HandleMark hm(thread);
240 ThreadToNativeFromVM ttn(thread);
241 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
242 // code knows that we have left the VM
244 if (_is_new_verify_byte_codes_fn) {
245 verify_byte_codes_fn_new_t func =
246 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
247 result = (*func)(env, cls, message, (int)message_len,
248 klass->major_version());
249 } else {
250 verify_byte_codes_fn_t func =
251 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
252 result = (*func)(env, cls, message, (int)message_len);
253 }
254 }
256 JNIHandles::destroy_local(cls);
258 // These numbers are chosen so that VerifyClassCodes interface doesn't need
259 // to be changed (still return jboolean (unsigned char)), and result is
260 // 1 when verification is passed.
261 if (result == 0) {
262 return vmSymbols::java_lang_VerifyError();
263 } else if (result == 1) {
264 return NULL; // verified.
265 } else if (result == 2) {
266 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
267 } else if (result == 3) {
268 return vmSymbols::java_lang_ClassFormatError();
269 } else {
270 ShouldNotReachHere();
271 return NULL;
272 }
273 }
275 TypeOrigin TypeOrigin::null() {
276 return TypeOrigin();
277 }
278 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
279 assert(frame != NULL, "Must have a frame");
280 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
281 frame->local_at(index));
282 }
283 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
284 assert(frame != NULL, "Must have a frame");
285 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
286 frame->stack_at(index));
287 }
288 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
289 assert(frame != NULL, "Must have a frame");
290 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
291 frame->local_at(index));
292 }
293 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
294 assert(frame != NULL, "Must have a frame");
295 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
296 frame->stack_at(index));
297 }
298 TypeOrigin TypeOrigin::bad_index(u2 index) {
299 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
300 }
301 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
302 return TypeOrigin(CONST_POOL, index, NULL, vt);
303 }
304 TypeOrigin TypeOrigin::signature(VerificationType vt) {
305 return TypeOrigin(SIG, 0, NULL, vt);
306 }
307 TypeOrigin TypeOrigin::implicit(VerificationType t) {
308 return TypeOrigin(IMPLICIT, 0, NULL, t);
309 }
310 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
311 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
312 VerificationType::bogus_type());
313 }
315 void TypeOrigin::reset_frame() {
316 if (_frame != NULL) {
317 _frame->restore();
318 }
319 }
321 void TypeOrigin::details(outputStream* ss) const {
322 _type.print_on(ss);
323 switch (_origin) {
324 case CF_LOCALS:
325 ss->print(" (current frame, locals[%d])", _index);
326 break;
327 case CF_STACK:
328 ss->print(" (current frame, stack[%d])", _index);
329 break;
330 case SM_LOCALS:
331 ss->print(" (stack map, locals[%d])", _index);
332 break;
333 case SM_STACK:
334 ss->print(" (stack map, stack[%d])", _index);
335 break;
336 case CONST_POOL:
337 ss->print(" (constant pool %d)", _index);
338 break;
339 case SIG:
340 ss->print(" (from method signature)");
341 break;
342 case IMPLICIT:
343 case FRAME_ONLY:
344 case NONE:
345 default:
346 ;
347 }
348 }
350 #ifdef ASSERT
351 void TypeOrigin::print_on(outputStream* str) const {
352 str->print("{%d,%d,%p:", _origin, _index, _frame);
353 if (_frame != NULL) {
354 _frame->print_on(str);
355 } else {
356 str->print("null");
357 }
358 str->print(",");
359 _type.print_on(str);
360 str->print("}");
361 }
362 #endif
364 void ErrorContext::details(outputStream* ss, Method* method) const {
365 if (is_valid()) {
366 ss->print_cr("");
367 ss->print_cr("Exception Details:");
368 location_details(ss, method);
369 reason_details(ss);
370 frame_details(ss);
371 bytecode_details(ss, method);
372 handler_details(ss, method);
373 stackmap_details(ss, method);
374 }
375 }
377 void ErrorContext::reason_details(outputStream* ss) const {
378 streamIndentor si(ss);
379 ss->indent().print_cr("Reason:");
380 streamIndentor si2(ss);
381 ss->indent().print("");
382 switch (_fault) {
383 case INVALID_BYTECODE:
384 ss->print("Error exists in the bytecode");
385 break;
386 case WRONG_TYPE:
387 if (_expected.is_valid()) {
388 ss->print("Type ");
389 _type.details(ss);
390 ss->print(" is not assignable to ");
391 _expected.details(ss);
392 } else {
393 ss->print("Invalid type: ");
394 _type.details(ss);
395 }
396 break;
397 case FLAGS_MISMATCH:
398 if (_expected.is_valid()) {
399 ss->print("Current frame's flags are not assignable "
400 "to stack map frame's.");
401 } else {
402 ss->print("Current frame's flags are invalid in this context.");
403 }
404 break;
405 case BAD_CP_INDEX:
406 ss->print("Constant pool index %d is invalid", _type.index());
407 break;
408 case BAD_LOCAL_INDEX:
409 ss->print("Local index %d is invalid", _type.index());
410 break;
411 case LOCALS_SIZE_MISMATCH:
412 ss->print("Current frame's local size doesn't match stackmap.");
413 break;
414 case STACK_SIZE_MISMATCH:
415 ss->print("Current frame's stack size doesn't match stackmap.");
416 break;
417 case STACK_OVERFLOW:
418 ss->print("Exceeded max stack size.");
419 break;
420 case STACK_UNDERFLOW:
421 ss->print("Attempt to pop empty stack.");
422 break;
423 case MISSING_STACKMAP:
424 ss->print("Expected stackmap frame at this location.");
425 break;
426 case BAD_STACKMAP:
427 ss->print("Invalid stackmap specification.");
428 break;
429 case UNKNOWN:
430 default:
431 ShouldNotReachHere();
432 ss->print_cr("Unknown");
433 }
434 ss->print_cr("");
435 }
437 void ErrorContext::location_details(outputStream* ss, Method* method) const {
438 if (_bci != -1 && method != NULL) {
439 streamIndentor si(ss);
440 const char* bytecode_name = "<invalid>";
441 if (method->validate_bci_from_bcx(_bci) != -1) {
442 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
443 if (Bytecodes::is_defined(code)) {
444 bytecode_name = Bytecodes::name(code);
445 } else {
446 bytecode_name = "<illegal>";
447 }
448 }
449 InstanceKlass* ik = InstanceKlass::cast(method->method_holder());
450 ss->indent().print_cr("Location:");
451 streamIndentor si2(ss);
452 ss->indent().print_cr("%s.%s%s @%d: %s",
453 ik->name()->as_C_string(), method->name()->as_C_string(),
454 method->signature()->as_C_string(), _bci, bytecode_name);
455 }
456 }
458 void ErrorContext::frame_details(outputStream* ss) const {
459 streamIndentor si(ss);
460 if (_type.is_valid() && _type.frame() != NULL) {
461 ss->indent().print_cr("Current Frame:");
462 streamIndentor si2(ss);
463 _type.frame()->print_on(ss);
464 }
465 if (_expected.is_valid() && _expected.frame() != NULL) {
466 ss->indent().print_cr("Stackmap Frame:");
467 streamIndentor si2(ss);
468 _expected.frame()->print_on(ss);
469 }
470 }
472 void ErrorContext::bytecode_details(outputStream* ss, Method* method) const {
473 if (method != NULL) {
474 streamIndentor si(ss);
475 ss->indent().print_cr("Bytecode:");
476 streamIndentor si2(ss);
477 ss->print_data(method->code_base(), method->code_size(), false);
478 }
479 }
481 void ErrorContext::handler_details(outputStream* ss, Method* method) const {
482 if (method != NULL) {
483 streamIndentor si(ss);
484 ExceptionTable table(method);
485 if (table.length() > 0) {
486 ss->indent().print_cr("Exception Handler Table:");
487 streamIndentor si2(ss);
488 for (int i = 0; i < table.length(); ++i) {
489 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
490 table.end_pc(i), table.handler_pc(i));
491 }
492 }
493 }
494 }
496 void ErrorContext::stackmap_details(outputStream* ss, Method* method) const {
497 if (method != NULL && method->has_stackmap_table()) {
498 streamIndentor si(ss);
499 ss->indent().print_cr("Stackmap Table:");
500 Array<u1>* data = method->stackmap_data();
501 stack_map_table* sm_table =
502 stack_map_table::at((address)data->adr_at(0));
503 stack_map_frame* sm_frame = sm_table->entries();
504 streamIndentor si2(ss);
505 int current_offset = -1;
506 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
507 ss->indent();
508 sm_frame->print_on(ss, current_offset);
509 ss->print_cr("");
510 current_offset += sm_frame->offset_delta();
511 sm_frame = sm_frame->next();
512 }
513 }
514 }
516 // Methods in ClassVerifier
518 ClassVerifier::ClassVerifier(
519 instanceKlassHandle klass, TRAPS)
520 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
521 _this_type = VerificationType::reference_type(klass->name());
522 // Create list to hold symbols in reference area.
523 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
524 }
526 ClassVerifier::~ClassVerifier() {
527 // Decrement the reference count for any symbols created.
528 for (int i = 0; i < _symbols->length(); i++) {
529 Symbol* s = _symbols->at(i);
530 s->decrement_refcount();
531 }
532 }
534 VerificationType ClassVerifier::object_type() const {
535 return VerificationType::reference_type(vmSymbols::java_lang_Object());
536 }
538 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) {
539 VerificationType vt = VerificationType::reference_type(
540 create_temporary_symbol(sig, (int)strlen(sig), THREAD));
541 return TypeOrigin::implicit(vt);
542 }
544 void ClassVerifier::verify_class(TRAPS) {
545 if (VerboseVerification) {
546 tty->print_cr("Verifying class %s with new format",
547 _klass->external_name());
548 }
550 Array<Method*>* methods = _klass->methods();
551 int num_methods = methods->length();
553 for (int index = 0; index < num_methods; index++) {
554 // Check for recursive re-verification before each method.
555 if (was_recursively_verified()) return;
557 Method* m = methods->at(index);
558 if (m->is_native() || m->is_abstract()) {
559 // If m is native or abstract, skip it. It is checked in class file
560 // parser that methods do not override a final method.
561 continue;
562 }
563 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
564 }
566 if (VerboseVerification || TraceClassInitialization) {
567 if (was_recursively_verified())
568 tty->print_cr("Recursive verification detected for: %s",
569 _klass->external_name());
570 }
571 }
573 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
574 HandleMark hm(THREAD);
575 _method = m; // initialize _method
576 if (VerboseVerification) {
577 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
578 }
580 const char* bad_type_msg = "Bad type on operand stack in %s";
582 int32_t max_stack = m->verifier_max_stack();
583 int32_t max_locals = m->max_locals();
584 constantPoolHandle cp(THREAD, m->constants());
586 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
587 class_format_error("Invalid method signature");
588 return;
589 }
591 // Initial stack map frame: offset is 0, stack is initially empty.
592 StackMapFrame current_frame(max_locals, max_stack, this);
593 // Set initial locals
594 VerificationType return_type = current_frame.set_locals_from_arg(
595 m, current_type(), CHECK_VERIFY(this));
597 int32_t stackmap_index = 0; // index to the stackmap array
599 u4 code_length = m->code_size();
601 // Scan the bytecode and map each instruction's start offset to a number.
602 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
604 int ex_min = code_length;
605 int ex_max = -1;
606 // Look through each item on the exception table. Each of the fields must refer
607 // to a legal instruction.
608 verify_exception_handler_table(
609 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
611 // Look through each entry on the local variable table and make sure
612 // its range of code array offsets is valid. (4169817)
613 if (m->has_localvariable_table()) {
614 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
615 }
617 Array<u1>* stackmap_data = m->stackmap_data();
618 StackMapStream stream(stackmap_data);
619 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
620 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
621 code_data, code_length, CHECK_VERIFY(this));
623 if (VerboseVerification) {
624 stackmap_table.print_on(tty);
625 }
627 RawBytecodeStream bcs(m);
629 // Scan the byte code linearly from the start to the end
630 bool no_control_flow = false; // Set to true when there is no direct control
631 // flow from current instruction to the next
632 // instruction in sequence
633 Bytecodes::Code opcode;
634 while (!bcs.is_last_bytecode()) {
635 // Check for recursive re-verification before each bytecode.
636 if (was_recursively_verified()) return;
638 opcode = bcs.raw_next();
639 u2 bci = bcs.bci();
641 // Set current frame's offset to bci
642 current_frame.set_offset(bci);
643 current_frame.set_mark();
645 // Make sure every offset in stackmap table point to the beginning to
646 // an instruction. Match current_frame to stackmap_table entry with
647 // the same offset if exists.
648 stackmap_index = verify_stackmap_table(
649 stackmap_index, bci, ¤t_frame, &stackmap_table,
650 no_control_flow, CHECK_VERIFY(this));
653 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
655 // Merge with the next instruction
656 {
657 u2 index;
658 int target;
659 VerificationType type, type2;
660 VerificationType atype;
662 #ifndef PRODUCT
663 if (VerboseVerification) {
664 current_frame.print_on(tty);
665 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
666 }
667 #endif
669 // Make sure wide instruction is in correct format
670 if (bcs.is_wide()) {
671 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
672 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
673 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
674 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
675 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
676 opcode != Bytecodes::_dstore) {
677 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
678 * if we encounter a wide instruction that modifies an invalid
679 * opcode (not one of the ones listed above) */
680 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
681 return;
682 }
683 }
685 switch (opcode) {
686 case Bytecodes::_nop :
687 no_control_flow = false; break;
688 case Bytecodes::_aconst_null :
689 current_frame.push_stack(
690 VerificationType::null_type(), CHECK_VERIFY(this));
691 no_control_flow = false; break;
692 case Bytecodes::_iconst_m1 :
693 case Bytecodes::_iconst_0 :
694 case Bytecodes::_iconst_1 :
695 case Bytecodes::_iconst_2 :
696 case Bytecodes::_iconst_3 :
697 case Bytecodes::_iconst_4 :
698 case Bytecodes::_iconst_5 :
699 current_frame.push_stack(
700 VerificationType::integer_type(), CHECK_VERIFY(this));
701 no_control_flow = false; break;
702 case Bytecodes::_lconst_0 :
703 case Bytecodes::_lconst_1 :
704 current_frame.push_stack_2(
705 VerificationType::long_type(),
706 VerificationType::long2_type(), CHECK_VERIFY(this));
707 no_control_flow = false; break;
708 case Bytecodes::_fconst_0 :
709 case Bytecodes::_fconst_1 :
710 case Bytecodes::_fconst_2 :
711 current_frame.push_stack(
712 VerificationType::float_type(), CHECK_VERIFY(this));
713 no_control_flow = false; break;
714 case Bytecodes::_dconst_0 :
715 case Bytecodes::_dconst_1 :
716 current_frame.push_stack_2(
717 VerificationType::double_type(),
718 VerificationType::double2_type(), CHECK_VERIFY(this));
719 no_control_flow = false; break;
720 case Bytecodes::_sipush :
721 case Bytecodes::_bipush :
722 current_frame.push_stack(
723 VerificationType::integer_type(), CHECK_VERIFY(this));
724 no_control_flow = false; break;
725 case Bytecodes::_ldc :
726 verify_ldc(
727 opcode, bcs.get_index_u1(), ¤t_frame,
728 cp, bci, CHECK_VERIFY(this));
729 no_control_flow = false; break;
730 case Bytecodes::_ldc_w :
731 case Bytecodes::_ldc2_w :
732 verify_ldc(
733 opcode, bcs.get_index_u2(), ¤t_frame,
734 cp, bci, CHECK_VERIFY(this));
735 no_control_flow = false; break;
736 case Bytecodes::_iload :
737 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
738 no_control_flow = false; break;
739 case Bytecodes::_iload_0 :
740 case Bytecodes::_iload_1 :
741 case Bytecodes::_iload_2 :
742 case Bytecodes::_iload_3 :
743 index = opcode - Bytecodes::_iload_0;
744 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
745 no_control_flow = false; break;
746 case Bytecodes::_lload :
747 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
748 no_control_flow = false; break;
749 case Bytecodes::_lload_0 :
750 case Bytecodes::_lload_1 :
751 case Bytecodes::_lload_2 :
752 case Bytecodes::_lload_3 :
753 index = opcode - Bytecodes::_lload_0;
754 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
755 no_control_flow = false; break;
756 case Bytecodes::_fload :
757 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
758 no_control_flow = false; break;
759 case Bytecodes::_fload_0 :
760 case Bytecodes::_fload_1 :
761 case Bytecodes::_fload_2 :
762 case Bytecodes::_fload_3 :
763 index = opcode - Bytecodes::_fload_0;
764 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
765 no_control_flow = false; break;
766 case Bytecodes::_dload :
767 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
768 no_control_flow = false; break;
769 case Bytecodes::_dload_0 :
770 case Bytecodes::_dload_1 :
771 case Bytecodes::_dload_2 :
772 case Bytecodes::_dload_3 :
773 index = opcode - Bytecodes::_dload_0;
774 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
775 no_control_flow = false; break;
776 case Bytecodes::_aload :
777 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
778 no_control_flow = false; break;
779 case Bytecodes::_aload_0 :
780 case Bytecodes::_aload_1 :
781 case Bytecodes::_aload_2 :
782 case Bytecodes::_aload_3 :
783 index = opcode - Bytecodes::_aload_0;
784 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
785 no_control_flow = false; break;
786 case Bytecodes::_iaload :
787 type = current_frame.pop_stack(
788 VerificationType::integer_type(), CHECK_VERIFY(this));
789 atype = current_frame.pop_stack(
790 VerificationType::reference_check(), CHECK_VERIFY(this));
791 if (!atype.is_int_array()) {
792 verify_error(ErrorContext::bad_type(bci,
793 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
794 bad_type_msg, "iaload");
795 return;
796 }
797 current_frame.push_stack(
798 VerificationType::integer_type(), CHECK_VERIFY(this));
799 no_control_flow = false; break;
800 case Bytecodes::_baload :
801 type = current_frame.pop_stack(
802 VerificationType::integer_type(), CHECK_VERIFY(this));
803 atype = current_frame.pop_stack(
804 VerificationType::reference_check(), CHECK_VERIFY(this));
805 if (!atype.is_bool_array() && !atype.is_byte_array()) {
806 verify_error(
807 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
808 bad_type_msg, "baload");
809 return;
810 }
811 current_frame.push_stack(
812 VerificationType::integer_type(), CHECK_VERIFY(this));
813 no_control_flow = false; break;
814 case Bytecodes::_caload :
815 type = current_frame.pop_stack(
816 VerificationType::integer_type(), CHECK_VERIFY(this));
817 atype = current_frame.pop_stack(
818 VerificationType::reference_check(), CHECK_VERIFY(this));
819 if (!atype.is_char_array()) {
820 verify_error(ErrorContext::bad_type(bci,
821 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
822 bad_type_msg, "caload");
823 return;
824 }
825 current_frame.push_stack(
826 VerificationType::integer_type(), CHECK_VERIFY(this));
827 no_control_flow = false; break;
828 case Bytecodes::_saload :
829 type = current_frame.pop_stack(
830 VerificationType::integer_type(), CHECK_VERIFY(this));
831 atype = current_frame.pop_stack(
832 VerificationType::reference_check(), CHECK_VERIFY(this));
833 if (!atype.is_short_array()) {
834 verify_error(ErrorContext::bad_type(bci,
835 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
836 bad_type_msg, "saload");
837 return;
838 }
839 current_frame.push_stack(
840 VerificationType::integer_type(), CHECK_VERIFY(this));
841 no_control_flow = false; break;
842 case Bytecodes::_laload :
843 type = current_frame.pop_stack(
844 VerificationType::integer_type(), CHECK_VERIFY(this));
845 atype = current_frame.pop_stack(
846 VerificationType::reference_check(), CHECK_VERIFY(this));
847 if (!atype.is_long_array()) {
848 verify_error(ErrorContext::bad_type(bci,
849 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
850 bad_type_msg, "laload");
851 return;
852 }
853 current_frame.push_stack_2(
854 VerificationType::long_type(),
855 VerificationType::long2_type(), CHECK_VERIFY(this));
856 no_control_flow = false; break;
857 case Bytecodes::_faload :
858 type = current_frame.pop_stack(
859 VerificationType::integer_type(), CHECK_VERIFY(this));
860 atype = current_frame.pop_stack(
861 VerificationType::reference_check(), CHECK_VERIFY(this));
862 if (!atype.is_float_array()) {
863 verify_error(ErrorContext::bad_type(bci,
864 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
865 bad_type_msg, "faload");
866 return;
867 }
868 current_frame.push_stack(
869 VerificationType::float_type(), CHECK_VERIFY(this));
870 no_control_flow = false; break;
871 case Bytecodes::_daload :
872 type = current_frame.pop_stack(
873 VerificationType::integer_type(), CHECK_VERIFY(this));
874 atype = current_frame.pop_stack(
875 VerificationType::reference_check(), CHECK_VERIFY(this));
876 if (!atype.is_double_array()) {
877 verify_error(ErrorContext::bad_type(bci,
878 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
879 bad_type_msg, "daload");
880 return;
881 }
882 current_frame.push_stack_2(
883 VerificationType::double_type(),
884 VerificationType::double2_type(), CHECK_VERIFY(this));
885 no_control_flow = false; break;
886 case Bytecodes::_aaload : {
887 type = current_frame.pop_stack(
888 VerificationType::integer_type(), CHECK_VERIFY(this));
889 atype = current_frame.pop_stack(
890 VerificationType::reference_check(), CHECK_VERIFY(this));
891 if (!atype.is_reference_array()) {
892 verify_error(ErrorContext::bad_type(bci,
893 current_frame.stack_top_ctx(),
894 TypeOrigin::implicit(VerificationType::reference_check())),
895 bad_type_msg, "aaload");
896 return;
897 }
898 if (atype.is_null()) {
899 current_frame.push_stack(
900 VerificationType::null_type(), CHECK_VERIFY(this));
901 } else {
902 VerificationType component =
903 atype.get_component(this, CHECK_VERIFY(this));
904 current_frame.push_stack(component, CHECK_VERIFY(this));
905 }
906 no_control_flow = false; break;
907 }
908 case Bytecodes::_istore :
909 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
910 no_control_flow = false; break;
911 case Bytecodes::_istore_0 :
912 case Bytecodes::_istore_1 :
913 case Bytecodes::_istore_2 :
914 case Bytecodes::_istore_3 :
915 index = opcode - Bytecodes::_istore_0;
916 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
917 no_control_flow = false; break;
918 case Bytecodes::_lstore :
919 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
920 no_control_flow = false; break;
921 case Bytecodes::_lstore_0 :
922 case Bytecodes::_lstore_1 :
923 case Bytecodes::_lstore_2 :
924 case Bytecodes::_lstore_3 :
925 index = opcode - Bytecodes::_lstore_0;
926 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
927 no_control_flow = false; break;
928 case Bytecodes::_fstore :
929 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
930 no_control_flow = false; break;
931 case Bytecodes::_fstore_0 :
932 case Bytecodes::_fstore_1 :
933 case Bytecodes::_fstore_2 :
934 case Bytecodes::_fstore_3 :
935 index = opcode - Bytecodes::_fstore_0;
936 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
937 no_control_flow = false; break;
938 case Bytecodes::_dstore :
939 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
940 no_control_flow = false; break;
941 case Bytecodes::_dstore_0 :
942 case Bytecodes::_dstore_1 :
943 case Bytecodes::_dstore_2 :
944 case Bytecodes::_dstore_3 :
945 index = opcode - Bytecodes::_dstore_0;
946 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
947 no_control_flow = false; break;
948 case Bytecodes::_astore :
949 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
950 no_control_flow = false; break;
951 case Bytecodes::_astore_0 :
952 case Bytecodes::_astore_1 :
953 case Bytecodes::_astore_2 :
954 case Bytecodes::_astore_3 :
955 index = opcode - Bytecodes::_astore_0;
956 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
957 no_control_flow = false; break;
958 case Bytecodes::_iastore :
959 type = current_frame.pop_stack(
960 VerificationType::integer_type(), CHECK_VERIFY(this));
961 type2 = current_frame.pop_stack(
962 VerificationType::integer_type(), CHECK_VERIFY(this));
963 atype = current_frame.pop_stack(
964 VerificationType::reference_check(), CHECK_VERIFY(this));
965 if (!atype.is_int_array()) {
966 verify_error(ErrorContext::bad_type(bci,
967 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
968 bad_type_msg, "iastore");
969 return;
970 }
971 no_control_flow = false; break;
972 case Bytecodes::_bastore :
973 type = current_frame.pop_stack(
974 VerificationType::integer_type(), CHECK_VERIFY(this));
975 type2 = current_frame.pop_stack(
976 VerificationType::integer_type(), CHECK_VERIFY(this));
977 atype = current_frame.pop_stack(
978 VerificationType::reference_check(), CHECK_VERIFY(this));
979 if (!atype.is_bool_array() && !atype.is_byte_array()) {
980 verify_error(
981 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
982 bad_type_msg, "bastore");
983 return;
984 }
985 no_control_flow = false; break;
986 case Bytecodes::_castore :
987 current_frame.pop_stack(
988 VerificationType::integer_type(), CHECK_VERIFY(this));
989 current_frame.pop_stack(
990 VerificationType::integer_type(), CHECK_VERIFY(this));
991 atype = current_frame.pop_stack(
992 VerificationType::reference_check(), CHECK_VERIFY(this));
993 if (!atype.is_char_array()) {
994 verify_error(ErrorContext::bad_type(bci,
995 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
996 bad_type_msg, "castore");
997 return;
998 }
999 no_control_flow = false; break;
1000 case Bytecodes::_sastore :
1001 current_frame.pop_stack(
1002 VerificationType::integer_type(), CHECK_VERIFY(this));
1003 current_frame.pop_stack(
1004 VerificationType::integer_type(), CHECK_VERIFY(this));
1005 atype = current_frame.pop_stack(
1006 VerificationType::reference_check(), CHECK_VERIFY(this));
1007 if (!atype.is_short_array()) {
1008 verify_error(ErrorContext::bad_type(bci,
1009 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1010 bad_type_msg, "sastore");
1011 return;
1012 }
1013 no_control_flow = false; break;
1014 case Bytecodes::_lastore :
1015 current_frame.pop_stack_2(
1016 VerificationType::long2_type(),
1017 VerificationType::long_type(), CHECK_VERIFY(this));
1018 current_frame.pop_stack(
1019 VerificationType::integer_type(), CHECK_VERIFY(this));
1020 atype = current_frame.pop_stack(
1021 VerificationType::reference_check(), CHECK_VERIFY(this));
1022 if (!atype.is_long_array()) {
1023 verify_error(ErrorContext::bad_type(bci,
1024 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1025 bad_type_msg, "lastore");
1026 return;
1027 }
1028 no_control_flow = false; break;
1029 case Bytecodes::_fastore :
1030 current_frame.pop_stack(
1031 VerificationType::float_type(), CHECK_VERIFY(this));
1032 current_frame.pop_stack
1033 (VerificationType::integer_type(), CHECK_VERIFY(this));
1034 atype = current_frame.pop_stack(
1035 VerificationType::reference_check(), CHECK_VERIFY(this));
1036 if (!atype.is_float_array()) {
1037 verify_error(ErrorContext::bad_type(bci,
1038 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1039 bad_type_msg, "fastore");
1040 return;
1041 }
1042 no_control_flow = false; break;
1043 case Bytecodes::_dastore :
1044 current_frame.pop_stack_2(
1045 VerificationType::double2_type(),
1046 VerificationType::double_type(), CHECK_VERIFY(this));
1047 current_frame.pop_stack(
1048 VerificationType::integer_type(), CHECK_VERIFY(this));
1049 atype = current_frame.pop_stack(
1050 VerificationType::reference_check(), CHECK_VERIFY(this));
1051 if (!atype.is_double_array()) {
1052 verify_error(ErrorContext::bad_type(bci,
1053 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1054 bad_type_msg, "dastore");
1055 return;
1056 }
1057 no_control_flow = false; break;
1058 case Bytecodes::_aastore :
1059 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1060 type2 = current_frame.pop_stack(
1061 VerificationType::integer_type(), CHECK_VERIFY(this));
1062 atype = current_frame.pop_stack(
1063 VerificationType::reference_check(), CHECK_VERIFY(this));
1064 // more type-checking is done at runtime
1065 if (!atype.is_reference_array()) {
1066 verify_error(ErrorContext::bad_type(bci,
1067 current_frame.stack_top_ctx(),
1068 TypeOrigin::implicit(VerificationType::reference_check())),
1069 bad_type_msg, "aastore");
1070 return;
1071 }
1072 // 4938384: relaxed constraint in JVMS 3nd edition.
1073 no_control_flow = false; break;
1074 case Bytecodes::_pop :
1075 current_frame.pop_stack(
1076 VerificationType::category1_check(), CHECK_VERIFY(this));
1077 no_control_flow = false; break;
1078 case Bytecodes::_pop2 :
1079 type = current_frame.pop_stack(CHECK_VERIFY(this));
1080 if (type.is_category1()) {
1081 current_frame.pop_stack(
1082 VerificationType::category1_check(), CHECK_VERIFY(this));
1083 } else if (type.is_category2_2nd()) {
1084 current_frame.pop_stack(
1085 VerificationType::category2_check(), CHECK_VERIFY(this));
1086 } else {
1087 /* Unreachable? Would need a category2_1st on TOS
1088 * which does not appear possible. */
1089 verify_error(
1090 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1091 bad_type_msg, "pop2");
1092 return;
1093 }
1094 no_control_flow = false; break;
1095 case Bytecodes::_dup :
1096 type = 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(type, CHECK_VERIFY(this));
1100 no_control_flow = false; break;
1101 case Bytecodes::_dup_x1 :
1102 type = current_frame.pop_stack(
1103 VerificationType::category1_check(), CHECK_VERIFY(this));
1104 type2 = current_frame.pop_stack(
1105 VerificationType::category1_check(), CHECK_VERIFY(this));
1106 current_frame.push_stack(type, CHECK_VERIFY(this));
1107 current_frame.push_stack(type2, CHECK_VERIFY(this));
1108 current_frame.push_stack(type, CHECK_VERIFY(this));
1109 no_control_flow = false; break;
1110 case Bytecodes::_dup_x2 :
1111 {
1112 VerificationType type3;
1113 type = current_frame.pop_stack(
1114 VerificationType::category1_check(), CHECK_VERIFY(this));
1115 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1116 if (type2.is_category1()) {
1117 type3 = current_frame.pop_stack(
1118 VerificationType::category1_check(), CHECK_VERIFY(this));
1119 } else if (type2.is_category2_2nd()) {
1120 type3 = current_frame.pop_stack(
1121 VerificationType::category2_check(), CHECK_VERIFY(this));
1122 } else {
1123 /* Unreachable? Would need a category2_1st at stack depth 2 with
1124 * a category1 on TOS which does not appear possible. */
1125 verify_error(ErrorContext::bad_type(
1126 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1127 return;
1128 }
1129 current_frame.push_stack(type, CHECK_VERIFY(this));
1130 current_frame.push_stack(type3, CHECK_VERIFY(this));
1131 current_frame.push_stack(type2, CHECK_VERIFY(this));
1132 current_frame.push_stack(type, CHECK_VERIFY(this));
1133 no_control_flow = false; break;
1134 }
1135 case Bytecodes::_dup2 :
1136 type = current_frame.pop_stack(CHECK_VERIFY(this));
1137 if (type.is_category1()) {
1138 type2 = current_frame.pop_stack(
1139 VerificationType::category1_check(), CHECK_VERIFY(this));
1140 } else if (type.is_category2_2nd()) {
1141 type2 = current_frame.pop_stack(
1142 VerificationType::category2_check(), CHECK_VERIFY(this));
1143 } else {
1144 /* Unreachable? Would need a category2_1st on TOS which does not
1145 * appear possible. */
1146 verify_error(
1147 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1148 bad_type_msg, "dup2");
1149 return;
1150 }
1151 current_frame.push_stack(type2, CHECK_VERIFY(this));
1152 current_frame.push_stack(type, CHECK_VERIFY(this));
1153 current_frame.push_stack(type2, CHECK_VERIFY(this));
1154 current_frame.push_stack(type, CHECK_VERIFY(this));
1155 no_control_flow = false; break;
1156 case Bytecodes::_dup2_x1 :
1157 {
1158 VerificationType type3;
1159 type = current_frame.pop_stack(CHECK_VERIFY(this));
1160 if (type.is_category1()) {
1161 type2 = current_frame.pop_stack(
1162 VerificationType::category1_check(), CHECK_VERIFY(this));
1163 } else if (type.is_category2_2nd()) {
1164 type2 = current_frame.pop_stack(
1165 VerificationType::category2_check(), CHECK_VERIFY(this));
1166 } else {
1167 /* Unreachable? Would need a category2_1st on TOS which does
1168 * not appear possible. */
1169 verify_error(
1170 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1171 bad_type_msg, "dup2_x1");
1172 return;
1173 }
1174 type3 = current_frame.pop_stack(
1175 VerificationType::category1_check(), CHECK_VERIFY(this));
1176 current_frame.push_stack(type2, CHECK_VERIFY(this));
1177 current_frame.push_stack(type, CHECK_VERIFY(this));
1178 current_frame.push_stack(type3, CHECK_VERIFY(this));
1179 current_frame.push_stack(type2, CHECK_VERIFY(this));
1180 current_frame.push_stack(type, CHECK_VERIFY(this));
1181 no_control_flow = false; break;
1182 }
1183 case Bytecodes::_dup2_x2 :
1184 {
1185 VerificationType type3, type4;
1186 type = current_frame.pop_stack(CHECK_VERIFY(this));
1187 if (type.is_category1()) {
1188 type2 = current_frame.pop_stack(
1189 VerificationType::category1_check(), CHECK_VERIFY(this));
1190 } else if (type.is_category2_2nd()) {
1191 type2 = current_frame.pop_stack(
1192 VerificationType::category2_check(), CHECK_VERIFY(this));
1193 } else {
1194 /* Unreachable? Would need a category2_1st on TOS which does
1195 * not appear possible. */
1196 verify_error(
1197 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1198 bad_type_msg, "dup2_x2");
1199 return;
1200 }
1201 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1202 if (type3.is_category1()) {
1203 type4 = current_frame.pop_stack(
1204 VerificationType::category1_check(), CHECK_VERIFY(this));
1205 } else if (type3.is_category2_2nd()) {
1206 type4 = current_frame.pop_stack(
1207 VerificationType::category2_check(), CHECK_VERIFY(this));
1208 } else {
1209 /* Unreachable? Would need a category2_1st on TOS after popping
1210 * a long/double or two category 1's, which does not
1211 * appear possible. */
1212 verify_error(
1213 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1214 bad_type_msg, "dup2_x2");
1215 return;
1216 }
1217 current_frame.push_stack(type2, CHECK_VERIFY(this));
1218 current_frame.push_stack(type, CHECK_VERIFY(this));
1219 current_frame.push_stack(type4, CHECK_VERIFY(this));
1220 current_frame.push_stack(type3, CHECK_VERIFY(this));
1221 current_frame.push_stack(type2, CHECK_VERIFY(this));
1222 current_frame.push_stack(type, CHECK_VERIFY(this));
1223 no_control_flow = false; break;
1224 }
1225 case Bytecodes::_swap :
1226 type = current_frame.pop_stack(
1227 VerificationType::category1_check(), CHECK_VERIFY(this));
1228 type2 = current_frame.pop_stack(
1229 VerificationType::category1_check(), CHECK_VERIFY(this));
1230 current_frame.push_stack(type, CHECK_VERIFY(this));
1231 current_frame.push_stack(type2, CHECK_VERIFY(this));
1232 no_control_flow = false; break;
1233 case Bytecodes::_iadd :
1234 case Bytecodes::_isub :
1235 case Bytecodes::_imul :
1236 case Bytecodes::_idiv :
1237 case Bytecodes::_irem :
1238 case Bytecodes::_ishl :
1239 case Bytecodes::_ishr :
1240 case Bytecodes::_iushr :
1241 case Bytecodes::_ior :
1242 case Bytecodes::_ixor :
1243 case Bytecodes::_iand :
1244 current_frame.pop_stack(
1245 VerificationType::integer_type(), CHECK_VERIFY(this));
1246 // fall through
1247 case Bytecodes::_ineg :
1248 current_frame.pop_stack(
1249 VerificationType::integer_type(), CHECK_VERIFY(this));
1250 current_frame.push_stack(
1251 VerificationType::integer_type(), CHECK_VERIFY(this));
1252 no_control_flow = false; break;
1253 case Bytecodes::_ladd :
1254 case Bytecodes::_lsub :
1255 case Bytecodes::_lmul :
1256 case Bytecodes::_ldiv :
1257 case Bytecodes::_lrem :
1258 case Bytecodes::_land :
1259 case Bytecodes::_lor :
1260 case Bytecodes::_lxor :
1261 current_frame.pop_stack_2(
1262 VerificationType::long2_type(),
1263 VerificationType::long_type(), CHECK_VERIFY(this));
1264 // fall through
1265 case Bytecodes::_lneg :
1266 current_frame.pop_stack_2(
1267 VerificationType::long2_type(),
1268 VerificationType::long_type(), CHECK_VERIFY(this));
1269 current_frame.push_stack_2(
1270 VerificationType::long_type(),
1271 VerificationType::long2_type(), CHECK_VERIFY(this));
1272 no_control_flow = false; break;
1273 case Bytecodes::_lshl :
1274 case Bytecodes::_lshr :
1275 case Bytecodes::_lushr :
1276 current_frame.pop_stack(
1277 VerificationType::integer_type(), CHECK_VERIFY(this));
1278 current_frame.pop_stack_2(
1279 VerificationType::long2_type(),
1280 VerificationType::long_type(), CHECK_VERIFY(this));
1281 current_frame.push_stack_2(
1282 VerificationType::long_type(),
1283 VerificationType::long2_type(), CHECK_VERIFY(this));
1284 no_control_flow = false; break;
1285 case Bytecodes::_fadd :
1286 case Bytecodes::_fsub :
1287 case Bytecodes::_fmul :
1288 case Bytecodes::_fdiv :
1289 case Bytecodes::_frem :
1290 current_frame.pop_stack(
1291 VerificationType::float_type(), CHECK_VERIFY(this));
1292 // fall through
1293 case Bytecodes::_fneg :
1294 current_frame.pop_stack(
1295 VerificationType::float_type(), CHECK_VERIFY(this));
1296 current_frame.push_stack(
1297 VerificationType::float_type(), CHECK_VERIFY(this));
1298 no_control_flow = false; break;
1299 case Bytecodes::_dadd :
1300 case Bytecodes::_dsub :
1301 case Bytecodes::_dmul :
1302 case Bytecodes::_ddiv :
1303 case Bytecodes::_drem :
1304 current_frame.pop_stack_2(
1305 VerificationType::double2_type(),
1306 VerificationType::double_type(), CHECK_VERIFY(this));
1307 // fall through
1308 case Bytecodes::_dneg :
1309 current_frame.pop_stack_2(
1310 VerificationType::double2_type(),
1311 VerificationType::double_type(), CHECK_VERIFY(this));
1312 current_frame.push_stack_2(
1313 VerificationType::double_type(),
1314 VerificationType::double2_type(), CHECK_VERIFY(this));
1315 no_control_flow = false; break;
1316 case Bytecodes::_iinc :
1317 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1318 no_control_flow = false; break;
1319 case Bytecodes::_i2l :
1320 type = current_frame.pop_stack(
1321 VerificationType::integer_type(), CHECK_VERIFY(this));
1322 current_frame.push_stack_2(
1323 VerificationType::long_type(),
1324 VerificationType::long2_type(), CHECK_VERIFY(this));
1325 no_control_flow = false; break;
1326 case Bytecodes::_l2i :
1327 current_frame.pop_stack_2(
1328 VerificationType::long2_type(),
1329 VerificationType::long_type(), CHECK_VERIFY(this));
1330 current_frame.push_stack(
1331 VerificationType::integer_type(), CHECK_VERIFY(this));
1332 no_control_flow = false; break;
1333 case Bytecodes::_i2f :
1334 current_frame.pop_stack(
1335 VerificationType::integer_type(), CHECK_VERIFY(this));
1336 current_frame.push_stack(
1337 VerificationType::float_type(), CHECK_VERIFY(this));
1338 no_control_flow = false; break;
1339 case Bytecodes::_i2d :
1340 current_frame.pop_stack(
1341 VerificationType::integer_type(), CHECK_VERIFY(this));
1342 current_frame.push_stack_2(
1343 VerificationType::double_type(),
1344 VerificationType::double2_type(), CHECK_VERIFY(this));
1345 no_control_flow = false; break;
1346 case Bytecodes::_l2f :
1347 current_frame.pop_stack_2(
1348 VerificationType::long2_type(),
1349 VerificationType::long_type(), CHECK_VERIFY(this));
1350 current_frame.push_stack(
1351 VerificationType::float_type(), CHECK_VERIFY(this));
1352 no_control_flow = false; break;
1353 case Bytecodes::_l2d :
1354 current_frame.pop_stack_2(
1355 VerificationType::long2_type(),
1356 VerificationType::long_type(), CHECK_VERIFY(this));
1357 current_frame.push_stack_2(
1358 VerificationType::double_type(),
1359 VerificationType::double2_type(), CHECK_VERIFY(this));
1360 no_control_flow = false; break;
1361 case Bytecodes::_f2i :
1362 current_frame.pop_stack(
1363 VerificationType::float_type(), CHECK_VERIFY(this));
1364 current_frame.push_stack(
1365 VerificationType::integer_type(), CHECK_VERIFY(this));
1366 no_control_flow = false; break;
1367 case Bytecodes::_f2l :
1368 current_frame.pop_stack(
1369 VerificationType::float_type(), CHECK_VERIFY(this));
1370 current_frame.push_stack_2(
1371 VerificationType::long_type(),
1372 VerificationType::long2_type(), CHECK_VERIFY(this));
1373 no_control_flow = false; break;
1374 case Bytecodes::_f2d :
1375 current_frame.pop_stack(
1376 VerificationType::float_type(), CHECK_VERIFY(this));
1377 current_frame.push_stack_2(
1378 VerificationType::double_type(),
1379 VerificationType::double2_type(), CHECK_VERIFY(this));
1380 no_control_flow = false; break;
1381 case Bytecodes::_d2i :
1382 current_frame.pop_stack_2(
1383 VerificationType::double2_type(),
1384 VerificationType::double_type(), CHECK_VERIFY(this));
1385 current_frame.push_stack(
1386 VerificationType::integer_type(), CHECK_VERIFY(this));
1387 no_control_flow = false; break;
1388 case Bytecodes::_d2l :
1389 current_frame.pop_stack_2(
1390 VerificationType::double2_type(),
1391 VerificationType::double_type(), CHECK_VERIFY(this));
1392 current_frame.push_stack_2(
1393 VerificationType::long_type(),
1394 VerificationType::long2_type(), CHECK_VERIFY(this));
1395 no_control_flow = false; break;
1396 case Bytecodes::_d2f :
1397 current_frame.pop_stack_2(
1398 VerificationType::double2_type(),
1399 VerificationType::double_type(), CHECK_VERIFY(this));
1400 current_frame.push_stack(
1401 VerificationType::float_type(), CHECK_VERIFY(this));
1402 no_control_flow = false; break;
1403 case Bytecodes::_i2b :
1404 case Bytecodes::_i2c :
1405 case Bytecodes::_i2s :
1406 current_frame.pop_stack(
1407 VerificationType::integer_type(), CHECK_VERIFY(this));
1408 current_frame.push_stack(
1409 VerificationType::integer_type(), CHECK_VERIFY(this));
1410 no_control_flow = false; break;
1411 case Bytecodes::_lcmp :
1412 current_frame.pop_stack_2(
1413 VerificationType::long2_type(),
1414 VerificationType::long_type(), CHECK_VERIFY(this));
1415 current_frame.pop_stack_2(
1416 VerificationType::long2_type(),
1417 VerificationType::long_type(), CHECK_VERIFY(this));
1418 current_frame.push_stack(
1419 VerificationType::integer_type(), CHECK_VERIFY(this));
1420 no_control_flow = false; break;
1421 case Bytecodes::_fcmpl :
1422 case Bytecodes::_fcmpg :
1423 current_frame.pop_stack(
1424 VerificationType::float_type(), CHECK_VERIFY(this));
1425 current_frame.pop_stack(
1426 VerificationType::float_type(), CHECK_VERIFY(this));
1427 current_frame.push_stack(
1428 VerificationType::integer_type(), CHECK_VERIFY(this));
1429 no_control_flow = false; break;
1430 case Bytecodes::_dcmpl :
1431 case Bytecodes::_dcmpg :
1432 current_frame.pop_stack_2(
1433 VerificationType::double2_type(),
1434 VerificationType::double_type(), CHECK_VERIFY(this));
1435 current_frame.pop_stack_2(
1436 VerificationType::double2_type(),
1437 VerificationType::double_type(), CHECK_VERIFY(this));
1438 current_frame.push_stack(
1439 VerificationType::integer_type(), CHECK_VERIFY(this));
1440 no_control_flow = false; break;
1441 case Bytecodes::_if_icmpeq:
1442 case Bytecodes::_if_icmpne:
1443 case Bytecodes::_if_icmplt:
1444 case Bytecodes::_if_icmpge:
1445 case Bytecodes::_if_icmpgt:
1446 case Bytecodes::_if_icmple:
1447 current_frame.pop_stack(
1448 VerificationType::integer_type(), CHECK_VERIFY(this));
1449 // fall through
1450 case Bytecodes::_ifeq:
1451 case Bytecodes::_ifne:
1452 case Bytecodes::_iflt:
1453 case Bytecodes::_ifge:
1454 case Bytecodes::_ifgt:
1455 case Bytecodes::_ifle:
1456 current_frame.pop_stack(
1457 VerificationType::integer_type(), CHECK_VERIFY(this));
1458 target = bcs.dest();
1459 stackmap_table.check_jump_target(
1460 ¤t_frame, target, CHECK_VERIFY(this));
1461 no_control_flow = false; break;
1462 case Bytecodes::_if_acmpeq :
1463 case Bytecodes::_if_acmpne :
1464 current_frame.pop_stack(
1465 VerificationType::reference_check(), CHECK_VERIFY(this));
1466 // fall through
1467 case Bytecodes::_ifnull :
1468 case Bytecodes::_ifnonnull :
1469 current_frame.pop_stack(
1470 VerificationType::reference_check(), CHECK_VERIFY(this));
1471 target = bcs.dest();
1472 stackmap_table.check_jump_target
1473 (¤t_frame, target, CHECK_VERIFY(this));
1474 no_control_flow = false; break;
1475 case Bytecodes::_goto :
1476 target = bcs.dest();
1477 stackmap_table.check_jump_target(
1478 ¤t_frame, target, CHECK_VERIFY(this));
1479 no_control_flow = true; break;
1480 case Bytecodes::_goto_w :
1481 target = bcs.dest_w();
1482 stackmap_table.check_jump_target(
1483 ¤t_frame, target, CHECK_VERIFY(this));
1484 no_control_flow = true; break;
1485 case Bytecodes::_tableswitch :
1486 case Bytecodes::_lookupswitch :
1487 verify_switch(
1488 &bcs, code_length, code_data, ¤t_frame,
1489 &stackmap_table, CHECK_VERIFY(this));
1490 no_control_flow = true; break;
1491 case Bytecodes::_ireturn :
1492 type = current_frame.pop_stack(
1493 VerificationType::integer_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::_lreturn :
1498 type2 = current_frame.pop_stack(
1499 VerificationType::long2_type(), CHECK_VERIFY(this));
1500 type = current_frame.pop_stack(
1501 VerificationType::long_type(), CHECK_VERIFY(this));
1502 verify_return_value(return_type, type, bci,
1503 ¤t_frame, CHECK_VERIFY(this));
1504 no_control_flow = true; break;
1505 case Bytecodes::_freturn :
1506 type = current_frame.pop_stack(
1507 VerificationType::float_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::_dreturn :
1512 type2 = current_frame.pop_stack(
1513 VerificationType::double2_type(), CHECK_VERIFY(this));
1514 type = current_frame.pop_stack(
1515 VerificationType::double_type(), CHECK_VERIFY(this));
1516 verify_return_value(return_type, type, bci,
1517 ¤t_frame, CHECK_VERIFY(this));
1518 no_control_flow = true; break;
1519 case Bytecodes::_areturn :
1520 type = current_frame.pop_stack(
1521 VerificationType::reference_check(), CHECK_VERIFY(this));
1522 verify_return_value(return_type, type, bci,
1523 ¤t_frame, CHECK_VERIFY(this));
1524 no_control_flow = true; break;
1525 case Bytecodes::_return :
1526 if (return_type != VerificationType::bogus_type()) {
1527 verify_error(ErrorContext::bad_code(bci),
1528 "Method expects a return value");
1529 return;
1530 }
1531 // Make sure "this" has been initialized if current method is an
1532 // <init>
1533 if (_method->name() == vmSymbols::object_initializer_name() &&
1534 current_frame.flag_this_uninit()) {
1535 verify_error(ErrorContext::bad_code(bci),
1536 "Constructor must call super() or this() "
1537 "before return");
1538 return;
1539 }
1540 no_control_flow = true; break;
1541 case Bytecodes::_getstatic :
1542 case Bytecodes::_putstatic :
1543 case Bytecodes::_getfield :
1544 case Bytecodes::_putfield :
1545 verify_field_instructions(
1546 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1547 no_control_flow = false; break;
1548 case Bytecodes::_invokevirtual :
1549 case Bytecodes::_invokespecial :
1550 case Bytecodes::_invokestatic :
1551 verify_invoke_instructions(
1552 &bcs, code_length, ¤t_frame,
1553 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1554 no_control_flow = false; break;
1555 case Bytecodes::_invokeinterface :
1556 case Bytecodes::_invokedynamic :
1557 verify_invoke_instructions(
1558 &bcs, code_length, ¤t_frame,
1559 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1560 no_control_flow = false; break;
1561 case Bytecodes::_new :
1562 {
1563 index = bcs.get_index_u2();
1564 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1565 VerificationType new_class_type =
1566 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1567 if (!new_class_type.is_object()) {
1568 verify_error(ErrorContext::bad_type(bci,
1569 TypeOrigin::cp(index, new_class_type)),
1570 "Illegal new instruction");
1571 return;
1572 }
1573 type = VerificationType::uninitialized_type(bci);
1574 current_frame.push_stack(type, CHECK_VERIFY(this));
1575 no_control_flow = false; break;
1576 }
1577 case Bytecodes::_newarray :
1578 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1579 current_frame.pop_stack(
1580 VerificationType::integer_type(), CHECK_VERIFY(this));
1581 current_frame.push_stack(type, CHECK_VERIFY(this));
1582 no_control_flow = false; break;
1583 case Bytecodes::_anewarray :
1584 verify_anewarray(
1585 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1586 no_control_flow = false; break;
1587 case Bytecodes::_arraylength :
1588 type = current_frame.pop_stack(
1589 VerificationType::reference_check(), CHECK_VERIFY(this));
1590 if (!(type.is_null() || type.is_array())) {
1591 verify_error(ErrorContext::bad_type(
1592 bci, current_frame.stack_top_ctx()),
1593 bad_type_msg, "arraylength");
1594 }
1595 current_frame.push_stack(
1596 VerificationType::integer_type(), CHECK_VERIFY(this));
1597 no_control_flow = false; break;
1598 case Bytecodes::_checkcast :
1599 {
1600 index = bcs.get_index_u2();
1601 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1602 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1603 VerificationType klass_type = cp_index_to_type(
1604 index, cp, CHECK_VERIFY(this));
1605 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1606 no_control_flow = false; break;
1607 }
1608 case Bytecodes::_instanceof : {
1609 index = bcs.get_index_u2();
1610 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1611 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1612 current_frame.push_stack(
1613 VerificationType::integer_type(), CHECK_VERIFY(this));
1614 no_control_flow = false; break;
1615 }
1616 case Bytecodes::_monitorenter :
1617 case Bytecodes::_monitorexit :
1618 current_frame.pop_stack(
1619 VerificationType::reference_check(), CHECK_VERIFY(this));
1620 no_control_flow = false; break;
1621 case Bytecodes::_multianewarray :
1622 {
1623 index = bcs.get_index_u2();
1624 u2 dim = *(bcs.bcp()+3);
1625 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1626 VerificationType new_array_type =
1627 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1628 if (!new_array_type.is_array()) {
1629 verify_error(ErrorContext::bad_type(bci,
1630 TypeOrigin::cp(index, new_array_type)),
1631 "Illegal constant pool index in multianewarray instruction");
1632 return;
1633 }
1634 if (dim < 1 || new_array_type.dimensions() < dim) {
1635 verify_error(ErrorContext::bad_code(bci),
1636 "Illegal dimension in multianewarray instruction: %d", dim);
1637 return;
1638 }
1639 for (int i = 0; i < dim; i++) {
1640 current_frame.pop_stack(
1641 VerificationType::integer_type(), CHECK_VERIFY(this));
1642 }
1643 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1644 no_control_flow = false; break;
1645 }
1646 case Bytecodes::_athrow :
1647 type = VerificationType::reference_type(
1648 vmSymbols::java_lang_Throwable());
1649 current_frame.pop_stack(type, CHECK_VERIFY(this));
1650 no_control_flow = true; break;
1651 default:
1652 // We only need to check the valid bytecodes in class file.
1653 // And jsr and ret are not in the new class file format in JDK1.5.
1654 verify_error(ErrorContext::bad_code(bci),
1655 "Bad instruction: %02x", opcode);
1656 no_control_flow = false;
1657 return;
1658 } // end switch
1659 } // end Merge with the next instruction
1661 // Look for possible jump target in exception handlers and see if it
1662 // matches current_frame
1663 if (bci >= ex_min && bci < ex_max) {
1664 verify_exception_handler_targets(
1665 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1666 }
1667 } // end while
1669 // Make sure that control flow does not fall through end of the method
1670 if (!no_control_flow) {
1671 verify_error(ErrorContext::bad_code(code_length),
1672 "Control flow falls through code end");
1673 return;
1674 }
1675 }
1677 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1678 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1679 memset(code_data, 0, sizeof(char) * code_length);
1680 RawBytecodeStream bcs(m);
1682 while (!bcs.is_last_bytecode()) {
1683 if (bcs.raw_next() != Bytecodes::_illegal) {
1684 int bci = bcs.bci();
1685 if (bcs.raw_code() == Bytecodes::_new) {
1686 code_data[bci] = NEW_OFFSET;
1687 } else {
1688 code_data[bci] = BYTECODE_OFFSET;
1689 }
1690 } else {
1691 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1692 return NULL;
1693 }
1694 }
1696 return code_data;
1697 }
1699 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1700 ExceptionTable exhandlers(_method());
1701 int exlength = exhandlers.length();
1702 constantPoolHandle cp (THREAD, _method->constants());
1704 for(int i = 0; i < exlength; i++) {
1705 //reacquire the table in case a GC happened
1706 ExceptionTable exhandlers(_method());
1707 u2 start_pc = exhandlers.start_pc(i);
1708 u2 end_pc = exhandlers.end_pc(i);
1709 u2 handler_pc = exhandlers.handler_pc(i);
1710 if (start_pc >= code_length || code_data[start_pc] == 0) {
1711 class_format_error("Illegal exception table start_pc %d", start_pc);
1712 return;
1713 }
1714 if (end_pc != code_length) { // special case: end_pc == code_length
1715 if (end_pc > code_length || code_data[end_pc] == 0) {
1716 class_format_error("Illegal exception table end_pc %d", end_pc);
1717 return;
1718 }
1719 }
1720 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1721 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1722 return;
1723 }
1724 int catch_type_index = exhandlers.catch_type_index(i);
1725 if (catch_type_index != 0) {
1726 VerificationType catch_type = cp_index_to_type(
1727 catch_type_index, cp, CHECK_VERIFY(this));
1728 VerificationType throwable =
1729 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1730 bool is_subclass = throwable.is_assignable_from(
1731 catch_type, this, CHECK_VERIFY(this));
1732 if (!is_subclass) {
1733 // 4286534: should throw VerifyError according to recent spec change
1734 verify_error(ErrorContext::bad_type(handler_pc,
1735 TypeOrigin::cp(catch_type_index, catch_type),
1736 TypeOrigin::implicit(throwable)),
1737 "Catch type is not a subclass "
1738 "of Throwable in exception handler %d", handler_pc);
1739 return;
1740 }
1741 }
1742 if (start_pc < min) min = start_pc;
1743 if (end_pc > max) max = end_pc;
1744 }
1745 }
1747 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1748 int localvariable_table_length = _method()->localvariable_table_length();
1749 if (localvariable_table_length > 0) {
1750 LocalVariableTableElement* table = _method()->localvariable_table_start();
1751 for (int i = 0; i < localvariable_table_length; i++) {
1752 u2 start_bci = table[i].start_bci;
1753 u2 length = table[i].length;
1755 if (start_bci >= code_length || code_data[start_bci] == 0) {
1756 class_format_error(
1757 "Illegal local variable table start_pc %d", start_bci);
1758 return;
1759 }
1760 u4 end_bci = (u4)(start_bci + length);
1761 if (end_bci != code_length) {
1762 if (end_bci >= code_length || code_data[end_bci] == 0) {
1763 class_format_error( "Illegal local variable table length %d", length);
1764 return;
1765 }
1766 }
1767 }
1768 }
1769 }
1771 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1772 StackMapFrame* current_frame,
1773 StackMapTable* stackmap_table,
1774 bool no_control_flow, TRAPS) {
1775 if (stackmap_index < stackmap_table->get_frame_count()) {
1776 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1777 if (no_control_flow && this_offset > bci) {
1778 verify_error(ErrorContext::missing_stackmap(bci),
1779 "Expecting a stack map frame");
1780 return 0;
1781 }
1782 if (this_offset == bci) {
1783 ErrorContext ctx;
1784 // See if current stack map can be assigned to the frame in table.
1785 // current_frame is the stackmap frame got from the last instruction.
1786 // If matched, current_frame will be updated by this method.
1787 bool matches = stackmap_table->match_stackmap(
1788 current_frame, this_offset, stackmap_index,
1789 !no_control_flow, true, &ctx, CHECK_VERIFY_(this, 0));
1790 if (!matches) {
1791 // report type error
1792 verify_error(ctx, "Instruction type does not match stack map");
1793 return 0;
1794 }
1795 stackmap_index++;
1796 } else if (this_offset < bci) {
1797 // current_offset should have met this_offset.
1798 class_format_error("Bad stack map offset %d", this_offset);
1799 return 0;
1800 }
1801 } else if (no_control_flow) {
1802 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1803 return 0;
1804 }
1805 return stackmap_index;
1806 }
1808 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1809 StackMapTable* stackmap_table, TRAPS) {
1810 constantPoolHandle cp (THREAD, _method->constants());
1811 ExceptionTable exhandlers(_method());
1812 int exlength = exhandlers.length();
1813 for(int i = 0; i < exlength; i++) {
1814 //reacquire the table in case a GC happened
1815 ExceptionTable exhandlers(_method());
1816 u2 start_pc = exhandlers.start_pc(i);
1817 u2 end_pc = exhandlers.end_pc(i);
1818 u2 handler_pc = exhandlers.handler_pc(i);
1819 int catch_type_index = exhandlers.catch_type_index(i);
1820 if(bci >= start_pc && bci < end_pc) {
1821 u1 flags = current_frame->flags();
1822 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1823 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1824 if (catch_type_index != 0) {
1825 // We know that this index refers to a subclass of Throwable
1826 VerificationType catch_type = cp_index_to_type(
1827 catch_type_index, cp, CHECK_VERIFY(this));
1828 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1829 } else {
1830 VerificationType throwable =
1831 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1832 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1833 }
1834 ErrorContext ctx;
1835 bool matches = stackmap_table->match_stackmap(
1836 new_frame, handler_pc, true, false, &ctx, CHECK_VERIFY(this));
1837 if (!matches) {
1838 verify_error(ctx, "Stack map does not match the one at "
1839 "exception handler %d", handler_pc);
1840 return;
1841 }
1842 }
1843 }
1844 }
1846 void ClassVerifier::verify_cp_index(
1847 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1848 int nconstants = cp->length();
1849 if ((index <= 0) || (index >= nconstants)) {
1850 verify_error(ErrorContext::bad_cp_index(bci, index),
1851 "Illegal constant pool index %d in class %s",
1852 index, InstanceKlass::cast(cp->pool_holder())->external_name());
1853 return;
1854 }
1855 }
1857 void ClassVerifier::verify_cp_type(
1858 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1860 // In some situations, bytecode rewriting may occur while we're verifying.
1861 // In this case, a constant pool cache exists and some indices refer to that
1862 // instead. Be sure we don't pick up such indices by accident.
1863 // We must check was_recursively_verified() before we get here.
1864 guarantee(cp->cache() == NULL, "not rewritten yet");
1866 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1867 unsigned int tag = cp->tag_at(index).value();
1868 if ((types & (1 << tag)) == 0) {
1869 verify_error(ErrorContext::bad_cp_index(bci, index),
1870 "Illegal type at constant pool entry %d in class %s",
1871 index, InstanceKlass::cast(cp->pool_holder())->external_name());
1872 return;
1873 }
1874 }
1876 void ClassVerifier::verify_cp_class_type(
1877 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1878 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1879 constantTag tag = cp->tag_at(index);
1880 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1881 verify_error(ErrorContext::bad_cp_index(bci, index),
1882 "Illegal type at constant pool entry %d in class %s",
1883 index, InstanceKlass::cast(cp->pool_holder())->external_name());
1884 return;
1885 }
1886 }
1888 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1889 stringStream ss;
1891 ctx.reset_frames();
1892 _exception_type = vmSymbols::java_lang_VerifyError();
1893 _error_context = ctx;
1894 va_list va;
1895 va_start(va, msg);
1896 ss.vprint(msg, va);
1897 va_end(va);
1898 _message = ss.as_string();
1899 #ifdef ASSERT
1900 ResourceMark rm;
1901 const char* exception_name = _exception_type->as_C_string();
1902 Exceptions::debug_check_abort(exception_name, NULL);
1903 #endif // ndef ASSERT
1904 }
1906 void ClassVerifier::class_format_error(const char* msg, ...) {
1907 stringStream ss;
1908 _exception_type = vmSymbols::java_lang_ClassFormatError();
1909 va_list va;
1910 va_start(va, msg);
1911 ss.vprint(msg, va);
1912 va_end(va);
1913 if (!_method.is_null()) {
1914 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1915 }
1916 _message = ss.as_string();
1917 }
1919 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1920 // Get current loader and protection domain first.
1921 oop loader = current_class()->class_loader();
1922 oop protection_domain = current_class()->protection_domain();
1924 return SystemDictionary::resolve_or_fail(
1925 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1926 true, CHECK_NULL);
1927 }
1929 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1930 Klass* target_class,
1931 Symbol* field_name,
1932 Symbol* field_sig,
1933 bool is_method) {
1934 No_Safepoint_Verifier nosafepoint;
1936 // If target class isn't a super class of this class, we don't worry about this case
1937 if (!this_class->is_subclass_of(target_class)) {
1938 return false;
1939 }
1940 // Check if the specified method or field is protected
1941 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1942 fieldDescriptor fd;
1943 if (is_method) {
1944 Method* m = target_instance->uncached_lookup_method(field_name, field_sig);
1945 if (m != NULL && m->is_protected()) {
1946 if (!this_class->is_same_class_package(m->method_holder())) {
1947 return true;
1948 }
1949 }
1950 } else {
1951 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1952 if (member_klass != NULL && fd.is_protected()) {
1953 if (!this_class->is_same_class_package(member_klass)) {
1954 return true;
1955 }
1956 }
1957 }
1958 return false;
1959 }
1961 void ClassVerifier::verify_ldc(
1962 int opcode, u2 index, StackMapFrame* current_frame,
1963 constantPoolHandle cp, u2 bci, TRAPS) {
1964 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1965 constantTag tag = cp->tag_at(index);
1966 unsigned int types;
1967 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1968 if (!tag.is_unresolved_klass()) {
1969 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1970 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1971 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1972 // Note: The class file parser already verified the legality of
1973 // MethodHandle and MethodType constants.
1974 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1975 }
1976 } else {
1977 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1978 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1979 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1980 }
1981 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1982 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1983 } else if (tag.is_string()) {
1984 current_frame->push_stack(
1985 VerificationType::reference_type(
1986 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1987 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1988 current_frame->push_stack(
1989 VerificationType::reference_type(
1990 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
1991 } else if (tag.is_int()) {
1992 current_frame->push_stack(
1993 VerificationType::integer_type(), CHECK_VERIFY(this));
1994 } else if (tag.is_float()) {
1995 current_frame->push_stack(
1996 VerificationType::float_type(), CHECK_VERIFY(this));
1997 } else if (tag.is_double()) {
1998 current_frame->push_stack_2(
1999 VerificationType::double_type(),
2000 VerificationType::double2_type(), CHECK_VERIFY(this));
2001 } else if (tag.is_long()) {
2002 current_frame->push_stack_2(
2003 VerificationType::long_type(),
2004 VerificationType::long2_type(), CHECK_VERIFY(this));
2005 } else if (tag.is_method_handle()) {
2006 current_frame->push_stack(
2007 VerificationType::reference_type(
2008 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2009 } else if (tag.is_method_type()) {
2010 current_frame->push_stack(
2011 VerificationType::reference_type(
2012 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2013 } else {
2014 /* Unreachable? verify_cp_type has already validated the cp type. */
2015 verify_error(
2016 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2017 return;
2018 }
2019 }
2021 void ClassVerifier::verify_switch(
2022 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2023 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2024 int bci = bcs->bci();
2025 address bcp = bcs->bcp();
2026 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2028 // 4639449 & 4647081: padding bytes must be 0
2029 u2 padding_offset = 1;
2030 while ((bcp + padding_offset) < aligned_bcp) {
2031 if(*(bcp + padding_offset) != 0) {
2032 verify_error(ErrorContext::bad_code(bci),
2033 "Nonzero padding byte in lookswitch or tableswitch");
2034 return;
2035 }
2036 padding_offset++;
2037 }
2038 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2039 int keys, delta;
2040 current_frame->pop_stack(
2041 VerificationType::integer_type(), CHECK_VERIFY(this));
2042 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2043 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2044 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2045 if (low > high) {
2046 verify_error(ErrorContext::bad_code(bci),
2047 "low must be less than or equal to high in tableswitch");
2048 return;
2049 }
2050 keys = high - low + 1;
2051 if (keys < 0) {
2052 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2053 return;
2054 }
2055 delta = 1;
2056 } else {
2057 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2058 if (keys < 0) {
2059 verify_error(ErrorContext::bad_code(bci),
2060 "number of keys in lookupswitch less than 0");
2061 return;
2062 }
2063 delta = 2;
2064 // Make sure that the lookupswitch items are sorted
2065 for (int i = 0; i < (keys - 1); i++) {
2066 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2067 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2068 if (this_key >= next_key) {
2069 verify_error(ErrorContext::bad_code(bci),
2070 "Bad lookupswitch instruction");
2071 return;
2072 }
2073 }
2074 }
2075 int target = bci + default_offset;
2076 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2077 for (int i = 0; i < keys; i++) {
2078 // Because check_jump_target() may safepoint, the bytecode could have
2079 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2080 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2081 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2082 stackmap_table->check_jump_target(
2083 current_frame, target, CHECK_VERIFY(this));
2084 }
2085 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2086 }
2088 bool ClassVerifier::name_in_supers(
2089 Symbol* ref_name, instanceKlassHandle current) {
2090 Klass* super = current->super();
2091 while (super != NULL) {
2092 if (super->name() == ref_name) {
2093 return true;
2094 }
2095 super = super->super();
2096 }
2097 return false;
2098 }
2100 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2101 StackMapFrame* current_frame,
2102 constantPoolHandle cp,
2103 TRAPS) {
2104 u2 index = bcs->get_index_u2();
2105 verify_cp_type(bcs->bci(), index, cp,
2106 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2108 // Get field name and signature
2109 Symbol* field_name = cp->name_ref_at(index);
2110 Symbol* field_sig = cp->signature_ref_at(index);
2112 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2113 class_format_error(
2114 "Invalid signature for field in class %s referenced "
2115 "from constant pool index %d", _klass->external_name(), index);
2116 return;
2117 }
2119 // Get referenced class type
2120 VerificationType ref_class_type = cp_ref_index_to_type(
2121 index, cp, CHECK_VERIFY(this));
2122 if (!ref_class_type.is_object()) {
2123 /* Unreachable? Class file parser verifies Fieldref contents */
2124 verify_error(ErrorContext::bad_type(bcs->bci(),
2125 TypeOrigin::cp(index, ref_class_type)),
2126 "Expecting reference to class in class %s at constant pool index %d",
2127 _klass->external_name(), index);
2128 return;
2129 }
2130 VerificationType target_class_type = ref_class_type;
2132 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2133 "buffer type must match VerificationType size");
2134 uintptr_t field_type_buffer[2];
2135 VerificationType* field_type = (VerificationType*)field_type_buffer;
2136 // If we make a VerificationType[2] array directly, the compiler calls
2137 // to the c-runtime library to do the allocation instead of just
2138 // stack allocating it. Plus it would run constructors. This shows up
2139 // in performance profiles.
2141 SignatureStream sig_stream(field_sig, false);
2142 VerificationType stack_object_type;
2143 int n = change_sig_to_verificationType(
2144 &sig_stream, field_type, CHECK_VERIFY(this));
2145 u2 bci = bcs->bci();
2146 bool is_assignable;
2147 switch (bcs->raw_code()) {
2148 case Bytecodes::_getstatic: {
2149 for (int i = 0; i < n; i++) {
2150 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2151 }
2152 break;
2153 }
2154 case Bytecodes::_putstatic: {
2155 for (int i = n - 1; i >= 0; i--) {
2156 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2157 }
2158 break;
2159 }
2160 case Bytecodes::_getfield: {
2161 stack_object_type = current_frame->pop_stack(
2162 target_class_type, CHECK_VERIFY(this));
2163 for (int i = 0; i < n; i++) {
2164 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2165 }
2166 goto check_protected;
2167 }
2168 case Bytecodes::_putfield: {
2169 for (int i = n - 1; i >= 0; i--) {
2170 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2171 }
2172 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2174 // The JVMS 2nd edition allows field initialization before the superclass
2175 // initializer, if the field is defined within the current class.
2176 fieldDescriptor fd;
2177 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2178 target_class_type.equals(current_type()) &&
2179 _klass->find_local_field(field_name, field_sig, &fd)) {
2180 stack_object_type = current_type();
2181 }
2182 is_assignable = target_class_type.is_assignable_from(
2183 stack_object_type, this, CHECK_VERIFY(this));
2184 if (!is_assignable) {
2185 verify_error(ErrorContext::bad_type(bci,
2186 current_frame->stack_top_ctx(),
2187 TypeOrigin::cp(index, target_class_type)),
2188 "Bad type on operand stack in putfield");
2189 return;
2190 }
2191 }
2192 check_protected: {
2193 if (_this_type == stack_object_type)
2194 break; // stack_object_type must be assignable to _current_class_type
2195 Symbol* ref_class_name =
2196 cp->klass_name_at(cp->klass_ref_index_at(index));
2197 if (!name_in_supers(ref_class_name, current_class()))
2198 // stack_object_type must be assignable to _current_class_type since:
2199 // 1. stack_object_type must be assignable to ref_class.
2200 // 2. ref_class must be _current_class or a subclass of it. It can't
2201 // be a superclass of it. See revised JVMS 5.4.4.
2202 break;
2204 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2205 if (is_protected_access(current_class(), ref_class_oop, field_name,
2206 field_sig, false)) {
2207 // It's protected access, check if stack object is assignable to
2208 // current class.
2209 is_assignable = current_type().is_assignable_from(
2210 stack_object_type, this, CHECK_VERIFY(this));
2211 if (!is_assignable) {
2212 verify_error(ErrorContext::bad_type(bci,
2213 current_frame->stack_top_ctx(),
2214 TypeOrigin::implicit(current_type())),
2215 "Bad access to protected data in getfield");
2216 return;
2217 }
2218 }
2219 break;
2220 }
2221 default: ShouldNotReachHere();
2222 }
2223 }
2225 void ClassVerifier::verify_invoke_init(
2226 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2227 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2228 constantPoolHandle cp, TRAPS) {
2229 u2 bci = bcs->bci();
2230 VerificationType type = current_frame->pop_stack(
2231 VerificationType::reference_check(), CHECK_VERIFY(this));
2232 if (type == VerificationType::uninitialized_this_type()) {
2233 // The method must be an <init> method of this class or its superclass
2234 Klass* superk = current_class()->super();
2235 if (ref_class_type.name() != current_class()->name() &&
2236 ref_class_type.name() != superk->name()) {
2237 verify_error(ErrorContext::bad_type(bci,
2238 TypeOrigin::implicit(ref_class_type),
2239 TypeOrigin::implicit(current_type())),
2240 "Bad <init> method call");
2241 return;
2242 }
2243 current_frame->initialize_object(type, current_type());
2244 *this_uninit = true;
2245 } else if (type.is_uninitialized()) {
2246 u2 new_offset = type.bci();
2247 address new_bcp = bcs->bcp() - bci + new_offset;
2248 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2249 /* Unreachable? Stack map parsing ensures valid type and new
2250 * instructions have a valid BCI. */
2251 verify_error(ErrorContext::bad_code(new_offset),
2252 "Expecting new instruction");
2253 return;
2254 }
2255 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2256 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2258 // The method must be an <init> method of the indicated class
2259 VerificationType new_class_type = cp_index_to_type(
2260 new_class_index, cp, CHECK_VERIFY(this));
2261 if (!new_class_type.equals(ref_class_type)) {
2262 verify_error(ErrorContext::bad_type(bci,
2263 TypeOrigin::cp(new_class_index, new_class_type),
2264 TypeOrigin::cp(ref_class_index, ref_class_type)),
2265 "Call to wrong <init> method");
2266 return;
2267 }
2268 // According to the VM spec, if the referent class is a superclass of the
2269 // current class, and is in a different runtime package, and the method is
2270 // protected, then the objectref must be the current class or a subclass
2271 // of the current class.
2272 VerificationType objectref_type = new_class_type;
2273 if (name_in_supers(ref_class_type.name(), current_class())) {
2274 Klass* ref_klass = load_class(
2275 ref_class_type.name(), CHECK_VERIFY(this));
2276 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2277 vmSymbols::object_initializer_name(),
2278 cp->signature_ref_at(bcs->get_index_u2()));
2279 instanceKlassHandle mh(THREAD, m->method_holder());
2280 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2281 bool assignable = current_type().is_assignable_from(
2282 objectref_type, this, CHECK_VERIFY(this));
2283 if (!assignable) {
2284 verify_error(ErrorContext::bad_type(bci,
2285 TypeOrigin::cp(new_class_index, objectref_type),
2286 TypeOrigin::implicit(current_type())),
2287 "Bad access to protected <init> method");
2288 return;
2289 }
2290 }
2291 }
2292 current_frame->initialize_object(type, new_class_type);
2293 } else {
2294 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2295 "Bad operand type when invoking <init>");
2296 return;
2297 }
2298 }
2300 void ClassVerifier::verify_invoke_instructions(
2301 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2302 bool *this_uninit, VerificationType return_type,
2303 constantPoolHandle cp, TRAPS) {
2304 // Make sure the constant pool item is the right type
2305 u2 index = bcs->get_index_u2();
2306 Bytecodes::Code opcode = bcs->raw_code();
2307 unsigned int types = (opcode == Bytecodes::_invokeinterface
2308 ? 1 << JVM_CONSTANT_InterfaceMethodref
2309 : opcode == Bytecodes::_invokedynamic
2310 ? 1 << JVM_CONSTANT_InvokeDynamic
2311 : 1 << JVM_CONSTANT_Methodref);
2312 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2314 // Get method name and signature
2315 Symbol* method_name = cp->name_ref_at(index);
2316 Symbol* method_sig = cp->signature_ref_at(index);
2318 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2319 class_format_error(
2320 "Invalid method signature in class %s referenced "
2321 "from constant pool index %d", _klass->external_name(), index);
2322 return;
2323 }
2325 // Get referenced class type
2326 VerificationType ref_class_type;
2327 if (opcode == Bytecodes::_invokedynamic) {
2328 if (!EnableInvokeDynamic ||
2329 _klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2330 class_format_error(
2331 (!EnableInvokeDynamic ?
2332 "invokedynamic instructions not enabled in this JVM" :
2333 "invokedynamic instructions not supported by this class file version"),
2334 _klass->external_name());
2335 return;
2336 }
2337 } else {
2338 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2339 }
2341 // For a small signature length, we just allocate 128 bytes instead
2342 // of parsing the signature once to find its size.
2343 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2344 // longs/doubles to be consertive.
2345 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2346 "buffer type must match VerificationType size");
2347 uintptr_t on_stack_sig_types_buffer[128];
2348 // If we make a VerificationType[128] array directly, the compiler calls
2349 // to the c-runtime library to do the allocation instead of just
2350 // stack allocating it. Plus it would run constructors. This shows up
2351 // in performance profiles.
2353 VerificationType* sig_types;
2354 int size = (method_sig->utf8_length() - 3) * 2;
2355 if (size > 128) {
2356 // Long and double occupies two slots here.
2357 ArgumentSizeComputer size_it(method_sig);
2358 size = size_it.size();
2359 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2360 } else{
2361 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2362 }
2363 SignatureStream sig_stream(method_sig);
2364 int sig_i = 0;
2365 while (!sig_stream.at_return_type()) {
2366 sig_i += change_sig_to_verificationType(
2367 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2368 sig_stream.next();
2369 }
2370 int nargs = sig_i;
2372 #ifdef ASSERT
2373 {
2374 ArgumentSizeComputer size_it(method_sig);
2375 assert(nargs == size_it.size(), "Argument sizes do not match");
2376 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2377 }
2378 #endif
2380 // Check instruction operands
2381 u2 bci = bcs->bci();
2382 if (opcode == Bytecodes::_invokeinterface) {
2383 address bcp = bcs->bcp();
2384 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2385 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2386 // the difference between the size of the operand stack before and after the instruction
2387 // executes.
2388 if (*(bcp+3) != (nargs+1)) {
2389 verify_error(ErrorContext::bad_code(bci),
2390 "Inconsistent args count operand in invokeinterface");
2391 return;
2392 }
2393 if (*(bcp+4) != 0) {
2394 verify_error(ErrorContext::bad_code(bci),
2395 "Fourth operand byte of invokeinterface must be zero");
2396 return;
2397 }
2398 }
2400 if (opcode == Bytecodes::_invokedynamic) {
2401 address bcp = bcs->bcp();
2402 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2403 verify_error(ErrorContext::bad_code(bci),
2404 "Third and fourth operand bytes of invokedynamic must be zero");
2405 return;
2406 }
2407 }
2409 if (method_name->byte_at(0) == '<') {
2410 // Make sure <init> can only be invoked by invokespecial
2411 if (opcode != Bytecodes::_invokespecial ||
2412 method_name != vmSymbols::object_initializer_name()) {
2413 verify_error(ErrorContext::bad_code(bci),
2414 "Illegal call to internal method");
2415 return;
2416 }
2417 } else if (opcode == Bytecodes::_invokespecial
2418 && !ref_class_type.equals(current_type())
2419 && !ref_class_type.equals(VerificationType::reference_type(
2420 current_class()->super()->name()))) {
2421 bool subtype = ref_class_type.is_assignable_from(
2422 current_type(), this, CHECK_VERIFY(this));
2423 if (!subtype) {
2424 verify_error(ErrorContext::bad_code(bci),
2425 "Bad invokespecial instruction: "
2426 "current class isn't assignable to reference class.");
2427 return;
2428 }
2429 }
2430 // Match method descriptor with operand stack
2431 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2432 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2433 }
2434 // Check objectref on operand stack
2435 if (opcode != Bytecodes::_invokestatic &&
2436 opcode != Bytecodes::_invokedynamic) {
2437 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2438 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2439 code_length, this_uninit, cp, CHECK_VERIFY(this));
2440 } else { // other methods
2441 // Ensures that target class is assignable to method class.
2442 if (opcode == Bytecodes::_invokespecial) {
2443 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2444 } else if (opcode == Bytecodes::_invokevirtual) {
2445 VerificationType stack_object_type =
2446 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2447 if (current_type() != stack_object_type) {
2448 assert(cp->cache() == NULL, "not rewritten yet");
2449 Symbol* ref_class_name =
2450 cp->klass_name_at(cp->klass_ref_index_at(index));
2451 // See the comments in verify_field_instructions() for
2452 // the rationale behind this.
2453 if (name_in_supers(ref_class_name, current_class())) {
2454 Klass* ref_class = load_class(ref_class_name, CHECK);
2455 if (is_protected_access(
2456 _klass, ref_class, method_name, method_sig, true)) {
2457 // It's protected access, check if stack object is
2458 // assignable to current class.
2459 bool is_assignable = current_type().is_assignable_from(
2460 stack_object_type, this, CHECK_VERIFY(this));
2461 if (!is_assignable) {
2462 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2463 && stack_object_type.is_array()
2464 && method_name == vmSymbols::clone_name()) {
2465 // Special case: arrays pretend to implement public Object
2466 // clone().
2467 } else {
2468 verify_error(ErrorContext::bad_type(bci,
2469 current_frame->stack_top_ctx(),
2470 TypeOrigin::implicit(current_type())),
2471 "Bad access to protected data in invokevirtual");
2472 return;
2473 }
2474 }
2475 }
2476 }
2477 }
2478 } else {
2479 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2480 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2481 }
2482 }
2483 }
2484 // Push the result type.
2485 if (sig_stream.type() != T_VOID) {
2486 if (method_name == vmSymbols::object_initializer_name()) {
2487 // <init> method must have a void return type
2488 /* Unreachable? Class file parser verifies that methods with '<' have
2489 * void return */
2490 verify_error(ErrorContext::bad_code(bci),
2491 "Return type must be void in <init> method");
2492 return;
2493 }
2494 VerificationType return_type[2];
2495 int n = change_sig_to_verificationType(
2496 &sig_stream, return_type, CHECK_VERIFY(this));
2497 for (int i = 0; i < n; i++) {
2498 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2499 }
2500 }
2501 }
2503 VerificationType ClassVerifier::get_newarray_type(
2504 u2 index, u2 bci, TRAPS) {
2505 const char* from_bt[] = {
2506 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2507 };
2508 if (index < T_BOOLEAN || index > T_LONG) {
2509 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2510 return VerificationType::bogus_type();
2511 }
2513 // from_bt[index] contains the array signature which has a length of 2
2514 Symbol* sig = create_temporary_symbol(
2515 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2516 return VerificationType::reference_type(sig);
2517 }
2519 void ClassVerifier::verify_anewarray(
2520 u2 bci, u2 index, constantPoolHandle cp,
2521 StackMapFrame* current_frame, TRAPS) {
2522 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2523 current_frame->pop_stack(
2524 VerificationType::integer_type(), CHECK_VERIFY(this));
2526 VerificationType component_type =
2527 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2528 int length;
2529 char* arr_sig_str;
2530 if (component_type.is_array()) { // it's an array
2531 const char* component_name = component_type.name()->as_utf8();
2532 // add one dimension to component
2533 length = (int)strlen(component_name) + 1;
2534 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2535 arr_sig_str[0] = '[';
2536 strncpy(&arr_sig_str[1], component_name, length - 1);
2537 } else { // it's an object or interface
2538 const char* component_name = component_type.name()->as_utf8();
2539 // add one dimension to component with 'L' prepended and ';' postpended.
2540 length = (int)strlen(component_name) + 3;
2541 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2542 arr_sig_str[0] = '[';
2543 arr_sig_str[1] = 'L';
2544 strncpy(&arr_sig_str[2], component_name, length - 2);
2545 arr_sig_str[length - 1] = ';';
2546 }
2547 Symbol* arr_sig = create_temporary_symbol(
2548 arr_sig_str, length, CHECK_VERIFY(this));
2549 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2550 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2551 }
2553 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2554 current_frame->get_local(
2555 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2556 current_frame->push_stack(
2557 VerificationType::integer_type(), CHECK_VERIFY(this));
2558 }
2560 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2561 current_frame->get_local_2(
2562 index, VerificationType::long_type(),
2563 VerificationType::long2_type(), CHECK_VERIFY(this));
2564 current_frame->push_stack_2(
2565 VerificationType::long_type(),
2566 VerificationType::long2_type(), CHECK_VERIFY(this));
2567 }
2569 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2570 current_frame->get_local(
2571 index, VerificationType::float_type(), CHECK_VERIFY(this));
2572 current_frame->push_stack(
2573 VerificationType::float_type(), CHECK_VERIFY(this));
2574 }
2576 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2577 current_frame->get_local_2(
2578 index, VerificationType::double_type(),
2579 VerificationType::double2_type(), CHECK_VERIFY(this));
2580 current_frame->push_stack_2(
2581 VerificationType::double_type(),
2582 VerificationType::double2_type(), CHECK_VERIFY(this));
2583 }
2585 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2586 VerificationType type = current_frame->get_local(
2587 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2588 current_frame->push_stack(type, CHECK_VERIFY(this));
2589 }
2591 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2592 current_frame->pop_stack(
2593 VerificationType::integer_type(), CHECK_VERIFY(this));
2594 current_frame->set_local(
2595 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2596 }
2598 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2599 current_frame->pop_stack_2(
2600 VerificationType::long2_type(),
2601 VerificationType::long_type(), CHECK_VERIFY(this));
2602 current_frame->set_local_2(
2603 index, VerificationType::long_type(),
2604 VerificationType::long2_type(), CHECK_VERIFY(this));
2605 }
2607 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2608 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2609 current_frame->set_local(
2610 index, VerificationType::float_type(), CHECK_VERIFY(this));
2611 }
2613 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2614 current_frame->pop_stack_2(
2615 VerificationType::double2_type(),
2616 VerificationType::double_type(), CHECK_VERIFY(this));
2617 current_frame->set_local_2(
2618 index, VerificationType::double_type(),
2619 VerificationType::double2_type(), CHECK_VERIFY(this));
2620 }
2622 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2623 VerificationType type = current_frame->pop_stack(
2624 VerificationType::reference_check(), CHECK_VERIFY(this));
2625 current_frame->set_local(index, type, CHECK_VERIFY(this));
2626 }
2628 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2629 VerificationType type = current_frame->get_local(
2630 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2631 current_frame->set_local(index, type, CHECK_VERIFY(this));
2632 }
2634 void ClassVerifier::verify_return_value(
2635 VerificationType return_type, VerificationType type, u2 bci,
2636 StackMapFrame* current_frame, TRAPS) {
2637 if (return_type == VerificationType::bogus_type()) {
2638 verify_error(ErrorContext::bad_type(bci,
2639 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2640 "Method expects a return value");
2641 return;
2642 }
2643 bool match = return_type.is_assignable_from(type, this, CHECK_VERIFY(this));
2644 if (!match) {
2645 verify_error(ErrorContext::bad_type(bci,
2646 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2647 "Bad return type");
2648 return;
2649 }
2650 }
2652 // The verifier creates symbols which are substrings of Symbols.
2653 // These are stored in the verifier until the end of verification so that
2654 // they can be reference counted.
2655 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2656 int end, TRAPS) {
2657 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2658 _symbols->push(sym);
2659 return sym;
2660 }
2662 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2663 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2664 _symbols->push(sym);
2665 return sym;
2666 }
