Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/classfile/verifier.cpp@ede380e13960
src/share/vm/classfile/verifier.cpp
Tue, 02 Apr 2013 11:28:33 +0200
- author
- mgerdin
- date
- Tue, 02 Apr 2013 11:28:33 +0200
- changeset 4850
- ede380e13960
- parent 4819
- 36376b540a98
- child 4895
- 09b0d3e9ba6c
- permissions
- -rw-r--r--
8009763: Add WB test for String.intern()
Summary: Add convenience method in StringTable, add WhiteBox method and simple sanity test
Reviewed-by: mgerdin, zgu
Contributed-by: leonid.mesnik@oracle.com
1 /*
2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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
65 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
67 // Access to external entry for VerifyClassCodes - old byte code verifier
69 extern "C" {
70 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
71 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
72 }
74 static void* volatile _verify_byte_codes_fn = NULL;
76 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
78 static void* verify_byte_codes_fn() {
79 if (_verify_byte_codes_fn == NULL) {
80 void *lib_handle = os::native_java_library();
81 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
82 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
83 if (func == NULL) {
84 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
85 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
86 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
87 }
88 }
89 return (void*)_verify_byte_codes_fn;
90 }
93 // Methods in Verifier
95 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
96 return (class_loader == NULL || !should_verify_class) ?
97 BytecodeVerificationLocal : BytecodeVerificationRemote;
98 }
100 bool Verifier::relax_verify_for(oop loader) {
101 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
102 bool need_verify =
103 // verifyAll
104 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
105 // verifyRemote
106 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
107 return !need_verify;
108 }
110 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
111 HandleMark hm;
112 ResourceMark rm(THREAD);
114 Symbol* exception_name = NULL;
115 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
116 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
117 char* exception_message = message_buffer;
119 const char* klassName = klass->external_name();
120 bool can_failover = FailOverToOldVerifier &&
121 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
123 // If the class should be verified, first see if we can use the split
124 // verifier. If not, or if verification fails and FailOverToOldVerifier
125 // is set, then call the inference verifier.
126 if (is_eligible_for_verification(klass, should_verify_class)) {
127 if (TraceClassInitialization) {
128 tty->print_cr("Start class verification for: %s", klassName);
129 }
130 if (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 = 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() || m->is_overpass()) {
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. Overpass methods
561 // are trusted since the VM generates them.
562 continue;
563 }
564 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
565 }
567 if (VerboseVerification || TraceClassInitialization) {
568 if (was_recursively_verified())
569 tty->print_cr("Recursive verification detected for: %s",
570 _klass->external_name());
571 }
572 }
574 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
575 HandleMark hm(THREAD);
576 _method = m; // initialize _method
577 if (VerboseVerification) {
578 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
579 }
581 const char* bad_type_msg = "Bad type on operand stack in %s";
583 int32_t max_stack = m->verifier_max_stack();
584 int32_t max_locals = m->max_locals();
585 constantPoolHandle cp(THREAD, m->constants());
587 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
588 class_format_error("Invalid method signature");
589 return;
590 }
592 // Initial stack map frame: offset is 0, stack is initially empty.
593 StackMapFrame current_frame(max_locals, max_stack, this);
594 // Set initial locals
595 VerificationType return_type = current_frame.set_locals_from_arg(
596 m, current_type(), CHECK_VERIFY(this));
598 int32_t stackmap_index = 0; // index to the stackmap array
600 u4 code_length = m->code_size();
602 // Scan the bytecode and map each instruction's start offset to a number.
603 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
605 int ex_min = code_length;
606 int ex_max = -1;
607 // Look through each item on the exception table. Each of the fields must refer
608 // to a legal instruction.
609 verify_exception_handler_table(
610 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
612 // Look through each entry on the local variable table and make sure
613 // its range of code array offsets is valid. (4169817)
614 if (m->has_localvariable_table()) {
615 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
616 }
618 Array<u1>* stackmap_data = m->stackmap_data();
619 StackMapStream stream(stackmap_data);
620 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
621 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
622 code_data, code_length, CHECK_VERIFY(this));
624 if (VerboseVerification) {
625 stackmap_table.print_on(tty);
626 }
628 RawBytecodeStream bcs(m);
630 // Scan the byte code linearly from the start to the end
631 bool no_control_flow = false; // Set to true when there is no direct control
632 // flow from current instruction to the next
633 // instruction in sequence
634 Bytecodes::Code opcode;
635 while (!bcs.is_last_bytecode()) {
636 // Check for recursive re-verification before each bytecode.
637 if (was_recursively_verified()) return;
639 opcode = bcs.raw_next();
640 u2 bci = bcs.bci();
642 // Set current frame's offset to bci
643 current_frame.set_offset(bci);
644 current_frame.set_mark();
646 // Make sure every offset in stackmap table point to the beginning to
647 // an instruction. Match current_frame to stackmap_table entry with
648 // the same offset if exists.
649 stackmap_index = verify_stackmap_table(
650 stackmap_index, bci, ¤t_frame, &stackmap_table,
651 no_control_flow, CHECK_VERIFY(this));
654 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
656 // Merge with the next instruction
657 {
658 u2 index;
659 int target;
660 VerificationType type, type2;
661 VerificationType atype;
663 #ifndef PRODUCT
664 if (VerboseVerification) {
665 current_frame.print_on(tty);
666 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
667 }
668 #endif
670 // Make sure wide instruction is in correct format
671 if (bcs.is_wide()) {
672 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
673 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
674 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
675 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
676 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
677 opcode != Bytecodes::_dstore) {
678 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
679 * if we encounter a wide instruction that modifies an invalid
680 * opcode (not one of the ones listed above) */
681 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
682 return;
683 }
684 }
686 switch (opcode) {
687 case Bytecodes::_nop :
688 no_control_flow = false; break;
689 case Bytecodes::_aconst_null :
690 current_frame.push_stack(
691 VerificationType::null_type(), CHECK_VERIFY(this));
692 no_control_flow = false; break;
693 case Bytecodes::_iconst_m1 :
694 case Bytecodes::_iconst_0 :
695 case Bytecodes::_iconst_1 :
696 case Bytecodes::_iconst_2 :
697 case Bytecodes::_iconst_3 :
698 case Bytecodes::_iconst_4 :
699 case Bytecodes::_iconst_5 :
700 current_frame.push_stack(
701 VerificationType::integer_type(), CHECK_VERIFY(this));
702 no_control_flow = false; break;
703 case Bytecodes::_lconst_0 :
704 case Bytecodes::_lconst_1 :
705 current_frame.push_stack_2(
706 VerificationType::long_type(),
707 VerificationType::long2_type(), CHECK_VERIFY(this));
708 no_control_flow = false; break;
709 case Bytecodes::_fconst_0 :
710 case Bytecodes::_fconst_1 :
711 case Bytecodes::_fconst_2 :
712 current_frame.push_stack(
713 VerificationType::float_type(), CHECK_VERIFY(this));
714 no_control_flow = false; break;
715 case Bytecodes::_dconst_0 :
716 case Bytecodes::_dconst_1 :
717 current_frame.push_stack_2(
718 VerificationType::double_type(),
719 VerificationType::double2_type(), CHECK_VERIFY(this));
720 no_control_flow = false; break;
721 case Bytecodes::_sipush :
722 case Bytecodes::_bipush :
723 current_frame.push_stack(
724 VerificationType::integer_type(), CHECK_VERIFY(this));
725 no_control_flow = false; break;
726 case Bytecodes::_ldc :
727 verify_ldc(
728 opcode, bcs.get_index_u1(), ¤t_frame,
729 cp, bci, CHECK_VERIFY(this));
730 no_control_flow = false; break;
731 case Bytecodes::_ldc_w :
732 case Bytecodes::_ldc2_w :
733 verify_ldc(
734 opcode, bcs.get_index_u2(), ¤t_frame,
735 cp, bci, CHECK_VERIFY(this));
736 no_control_flow = false; break;
737 case Bytecodes::_iload :
738 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
739 no_control_flow = false; break;
740 case Bytecodes::_iload_0 :
741 case Bytecodes::_iload_1 :
742 case Bytecodes::_iload_2 :
743 case Bytecodes::_iload_3 :
744 index = opcode - Bytecodes::_iload_0;
745 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
746 no_control_flow = false; break;
747 case Bytecodes::_lload :
748 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
749 no_control_flow = false; break;
750 case Bytecodes::_lload_0 :
751 case Bytecodes::_lload_1 :
752 case Bytecodes::_lload_2 :
753 case Bytecodes::_lload_3 :
754 index = opcode - Bytecodes::_lload_0;
755 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
756 no_control_flow = false; break;
757 case Bytecodes::_fload :
758 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
759 no_control_flow = false; break;
760 case Bytecodes::_fload_0 :
761 case Bytecodes::_fload_1 :
762 case Bytecodes::_fload_2 :
763 case Bytecodes::_fload_3 :
764 index = opcode - Bytecodes::_fload_0;
765 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
766 no_control_flow = false; break;
767 case Bytecodes::_dload :
768 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
769 no_control_flow = false; break;
770 case Bytecodes::_dload_0 :
771 case Bytecodes::_dload_1 :
772 case Bytecodes::_dload_2 :
773 case Bytecodes::_dload_3 :
774 index = opcode - Bytecodes::_dload_0;
775 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
776 no_control_flow = false; break;
777 case Bytecodes::_aload :
778 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
779 no_control_flow = false; break;
780 case Bytecodes::_aload_0 :
781 case Bytecodes::_aload_1 :
782 case Bytecodes::_aload_2 :
783 case Bytecodes::_aload_3 :
784 index = opcode - Bytecodes::_aload_0;
785 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
786 no_control_flow = false; break;
787 case Bytecodes::_iaload :
788 type = current_frame.pop_stack(
789 VerificationType::integer_type(), CHECK_VERIFY(this));
790 atype = current_frame.pop_stack(
791 VerificationType::reference_check(), CHECK_VERIFY(this));
792 if (!atype.is_int_array()) {
793 verify_error(ErrorContext::bad_type(bci,
794 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
795 bad_type_msg, "iaload");
796 return;
797 }
798 current_frame.push_stack(
799 VerificationType::integer_type(), CHECK_VERIFY(this));
800 no_control_flow = false; break;
801 case Bytecodes::_baload :
802 type = current_frame.pop_stack(
803 VerificationType::integer_type(), CHECK_VERIFY(this));
804 atype = current_frame.pop_stack(
805 VerificationType::reference_check(), CHECK_VERIFY(this));
806 if (!atype.is_bool_array() && !atype.is_byte_array()) {
807 verify_error(
808 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
809 bad_type_msg, "baload");
810 return;
811 }
812 current_frame.push_stack(
813 VerificationType::integer_type(), CHECK_VERIFY(this));
814 no_control_flow = false; break;
815 case Bytecodes::_caload :
816 type = current_frame.pop_stack(
817 VerificationType::integer_type(), CHECK_VERIFY(this));
818 atype = current_frame.pop_stack(
819 VerificationType::reference_check(), CHECK_VERIFY(this));
820 if (!atype.is_char_array()) {
821 verify_error(ErrorContext::bad_type(bci,
822 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
823 bad_type_msg, "caload");
824 return;
825 }
826 current_frame.push_stack(
827 VerificationType::integer_type(), CHECK_VERIFY(this));
828 no_control_flow = false; break;
829 case Bytecodes::_saload :
830 type = current_frame.pop_stack(
831 VerificationType::integer_type(), CHECK_VERIFY(this));
832 atype = current_frame.pop_stack(
833 VerificationType::reference_check(), CHECK_VERIFY(this));
834 if (!atype.is_short_array()) {
835 verify_error(ErrorContext::bad_type(bci,
836 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
837 bad_type_msg, "saload");
838 return;
839 }
840 current_frame.push_stack(
841 VerificationType::integer_type(), CHECK_VERIFY(this));
842 no_control_flow = false; break;
843 case Bytecodes::_laload :
844 type = current_frame.pop_stack(
845 VerificationType::integer_type(), CHECK_VERIFY(this));
846 atype = current_frame.pop_stack(
847 VerificationType::reference_check(), CHECK_VERIFY(this));
848 if (!atype.is_long_array()) {
849 verify_error(ErrorContext::bad_type(bci,
850 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
851 bad_type_msg, "laload");
852 return;
853 }
854 current_frame.push_stack_2(
855 VerificationType::long_type(),
856 VerificationType::long2_type(), CHECK_VERIFY(this));
857 no_control_flow = false; break;
858 case Bytecodes::_faload :
859 type = current_frame.pop_stack(
860 VerificationType::integer_type(), CHECK_VERIFY(this));
861 atype = current_frame.pop_stack(
862 VerificationType::reference_check(), CHECK_VERIFY(this));
863 if (!atype.is_float_array()) {
864 verify_error(ErrorContext::bad_type(bci,
865 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
866 bad_type_msg, "faload");
867 return;
868 }
869 current_frame.push_stack(
870 VerificationType::float_type(), CHECK_VERIFY(this));
871 no_control_flow = false; break;
872 case Bytecodes::_daload :
873 type = current_frame.pop_stack(
874 VerificationType::integer_type(), CHECK_VERIFY(this));
875 atype = current_frame.pop_stack(
876 VerificationType::reference_check(), CHECK_VERIFY(this));
877 if (!atype.is_double_array()) {
878 verify_error(ErrorContext::bad_type(bci,
879 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
880 bad_type_msg, "daload");
881 return;
882 }
883 current_frame.push_stack_2(
884 VerificationType::double_type(),
885 VerificationType::double2_type(), CHECK_VERIFY(this));
886 no_control_flow = false; break;
887 case Bytecodes::_aaload : {
888 type = current_frame.pop_stack(
889 VerificationType::integer_type(), CHECK_VERIFY(this));
890 atype = current_frame.pop_stack(
891 VerificationType::reference_check(), CHECK_VERIFY(this));
892 if (!atype.is_reference_array()) {
893 verify_error(ErrorContext::bad_type(bci,
894 current_frame.stack_top_ctx(),
895 TypeOrigin::implicit(VerificationType::reference_check())),
896 bad_type_msg, "aaload");
897 return;
898 }
899 if (atype.is_null()) {
900 current_frame.push_stack(
901 VerificationType::null_type(), CHECK_VERIFY(this));
902 } else {
903 VerificationType component =
904 atype.get_component(this, CHECK_VERIFY(this));
905 current_frame.push_stack(component, CHECK_VERIFY(this));
906 }
907 no_control_flow = false; break;
908 }
909 case Bytecodes::_istore :
910 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
911 no_control_flow = false; break;
912 case Bytecodes::_istore_0 :
913 case Bytecodes::_istore_1 :
914 case Bytecodes::_istore_2 :
915 case Bytecodes::_istore_3 :
916 index = opcode - Bytecodes::_istore_0;
917 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
918 no_control_flow = false; break;
919 case Bytecodes::_lstore :
920 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
921 no_control_flow = false; break;
922 case Bytecodes::_lstore_0 :
923 case Bytecodes::_lstore_1 :
924 case Bytecodes::_lstore_2 :
925 case Bytecodes::_lstore_3 :
926 index = opcode - Bytecodes::_lstore_0;
927 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
928 no_control_flow = false; break;
929 case Bytecodes::_fstore :
930 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
931 no_control_flow = false; break;
932 case Bytecodes::_fstore_0 :
933 case Bytecodes::_fstore_1 :
934 case Bytecodes::_fstore_2 :
935 case Bytecodes::_fstore_3 :
936 index = opcode - Bytecodes::_fstore_0;
937 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
938 no_control_flow = false; break;
939 case Bytecodes::_dstore :
940 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
941 no_control_flow = false; break;
942 case Bytecodes::_dstore_0 :
943 case Bytecodes::_dstore_1 :
944 case Bytecodes::_dstore_2 :
945 case Bytecodes::_dstore_3 :
946 index = opcode - Bytecodes::_dstore_0;
947 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
948 no_control_flow = false; break;
949 case Bytecodes::_astore :
950 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
951 no_control_flow = false; break;
952 case Bytecodes::_astore_0 :
953 case Bytecodes::_astore_1 :
954 case Bytecodes::_astore_2 :
955 case Bytecodes::_astore_3 :
956 index = opcode - Bytecodes::_astore_0;
957 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
958 no_control_flow = false; break;
959 case Bytecodes::_iastore :
960 type = current_frame.pop_stack(
961 VerificationType::integer_type(), CHECK_VERIFY(this));
962 type2 = current_frame.pop_stack(
963 VerificationType::integer_type(), CHECK_VERIFY(this));
964 atype = current_frame.pop_stack(
965 VerificationType::reference_check(), CHECK_VERIFY(this));
966 if (!atype.is_int_array()) {
967 verify_error(ErrorContext::bad_type(bci,
968 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
969 bad_type_msg, "iastore");
970 return;
971 }
972 no_control_flow = false; break;
973 case Bytecodes::_bastore :
974 type = current_frame.pop_stack(
975 VerificationType::integer_type(), CHECK_VERIFY(this));
976 type2 = current_frame.pop_stack(
977 VerificationType::integer_type(), CHECK_VERIFY(this));
978 atype = current_frame.pop_stack(
979 VerificationType::reference_check(), CHECK_VERIFY(this));
980 if (!atype.is_bool_array() && !atype.is_byte_array()) {
981 verify_error(
982 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
983 bad_type_msg, "bastore");
984 return;
985 }
986 no_control_flow = false; break;
987 case Bytecodes::_castore :
988 current_frame.pop_stack(
989 VerificationType::integer_type(), CHECK_VERIFY(this));
990 current_frame.pop_stack(
991 VerificationType::integer_type(), CHECK_VERIFY(this));
992 atype = current_frame.pop_stack(
993 VerificationType::reference_check(), CHECK_VERIFY(this));
994 if (!atype.is_char_array()) {
995 verify_error(ErrorContext::bad_type(bci,
996 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
997 bad_type_msg, "castore");
998 return;
999 }
1000 no_control_flow = false; break;
1001 case Bytecodes::_sastore :
1002 current_frame.pop_stack(
1003 VerificationType::integer_type(), CHECK_VERIFY(this));
1004 current_frame.pop_stack(
1005 VerificationType::integer_type(), CHECK_VERIFY(this));
1006 atype = current_frame.pop_stack(
1007 VerificationType::reference_check(), CHECK_VERIFY(this));
1008 if (!atype.is_short_array()) {
1009 verify_error(ErrorContext::bad_type(bci,
1010 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1011 bad_type_msg, "sastore");
1012 return;
1013 }
1014 no_control_flow = false; break;
1015 case Bytecodes::_lastore :
1016 current_frame.pop_stack_2(
1017 VerificationType::long2_type(),
1018 VerificationType::long_type(), CHECK_VERIFY(this));
1019 current_frame.pop_stack(
1020 VerificationType::integer_type(), CHECK_VERIFY(this));
1021 atype = current_frame.pop_stack(
1022 VerificationType::reference_check(), CHECK_VERIFY(this));
1023 if (!atype.is_long_array()) {
1024 verify_error(ErrorContext::bad_type(bci,
1025 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1026 bad_type_msg, "lastore");
1027 return;
1028 }
1029 no_control_flow = false; break;
1030 case Bytecodes::_fastore :
1031 current_frame.pop_stack(
1032 VerificationType::float_type(), CHECK_VERIFY(this));
1033 current_frame.pop_stack
1034 (VerificationType::integer_type(), CHECK_VERIFY(this));
1035 atype = current_frame.pop_stack(
1036 VerificationType::reference_check(), CHECK_VERIFY(this));
1037 if (!atype.is_float_array()) {
1038 verify_error(ErrorContext::bad_type(bci,
1039 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1040 bad_type_msg, "fastore");
1041 return;
1042 }
1043 no_control_flow = false; break;
1044 case Bytecodes::_dastore :
1045 current_frame.pop_stack_2(
1046 VerificationType::double2_type(),
1047 VerificationType::double_type(), CHECK_VERIFY(this));
1048 current_frame.pop_stack(
1049 VerificationType::integer_type(), CHECK_VERIFY(this));
1050 atype = current_frame.pop_stack(
1051 VerificationType::reference_check(), CHECK_VERIFY(this));
1052 if (!atype.is_double_array()) {
1053 verify_error(ErrorContext::bad_type(bci,
1054 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1055 bad_type_msg, "dastore");
1056 return;
1057 }
1058 no_control_flow = false; break;
1059 case Bytecodes::_aastore :
1060 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1061 type2 = current_frame.pop_stack(
1062 VerificationType::integer_type(), CHECK_VERIFY(this));
1063 atype = current_frame.pop_stack(
1064 VerificationType::reference_check(), CHECK_VERIFY(this));
1065 // more type-checking is done at runtime
1066 if (!atype.is_reference_array()) {
1067 verify_error(ErrorContext::bad_type(bci,
1068 current_frame.stack_top_ctx(),
1069 TypeOrigin::implicit(VerificationType::reference_check())),
1070 bad_type_msg, "aastore");
1071 return;
1072 }
1073 // 4938384: relaxed constraint in JVMS 3nd edition.
1074 no_control_flow = false; break;
1075 case Bytecodes::_pop :
1076 current_frame.pop_stack(
1077 VerificationType::category1_check(), CHECK_VERIFY(this));
1078 no_control_flow = false; break;
1079 case Bytecodes::_pop2 :
1080 type = current_frame.pop_stack(CHECK_VERIFY(this));
1081 if (type.is_category1()) {
1082 current_frame.pop_stack(
1083 VerificationType::category1_check(), CHECK_VERIFY(this));
1084 } else if (type.is_category2_2nd()) {
1085 current_frame.pop_stack(
1086 VerificationType::category2_check(), CHECK_VERIFY(this));
1087 } else {
1088 /* Unreachable? Would need a category2_1st on TOS
1089 * which does not appear possible. */
1090 verify_error(
1091 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1092 bad_type_msg, "pop2");
1093 return;
1094 }
1095 no_control_flow = false; break;
1096 case Bytecodes::_dup :
1097 type = current_frame.pop_stack(
1098 VerificationType::category1_check(), CHECK_VERIFY(this));
1099 current_frame.push_stack(type, CHECK_VERIFY(this));
1100 current_frame.push_stack(type, CHECK_VERIFY(this));
1101 no_control_flow = false; break;
1102 case Bytecodes::_dup_x1 :
1103 type = current_frame.pop_stack(
1104 VerificationType::category1_check(), CHECK_VERIFY(this));
1105 type2 = current_frame.pop_stack(
1106 VerificationType::category1_check(), CHECK_VERIFY(this));
1107 current_frame.push_stack(type, CHECK_VERIFY(this));
1108 current_frame.push_stack(type2, CHECK_VERIFY(this));
1109 current_frame.push_stack(type, CHECK_VERIFY(this));
1110 no_control_flow = false; break;
1111 case Bytecodes::_dup_x2 :
1112 {
1113 VerificationType type3;
1114 type = current_frame.pop_stack(
1115 VerificationType::category1_check(), CHECK_VERIFY(this));
1116 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1117 if (type2.is_category1()) {
1118 type3 = current_frame.pop_stack(
1119 VerificationType::category1_check(), CHECK_VERIFY(this));
1120 } else if (type2.is_category2_2nd()) {
1121 type3 = current_frame.pop_stack(
1122 VerificationType::category2_check(), CHECK_VERIFY(this));
1123 } else {
1124 /* Unreachable? Would need a category2_1st at stack depth 2 with
1125 * a category1 on TOS which does not appear possible. */
1126 verify_error(ErrorContext::bad_type(
1127 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1128 return;
1129 }
1130 current_frame.push_stack(type, CHECK_VERIFY(this));
1131 current_frame.push_stack(type3, CHECK_VERIFY(this));
1132 current_frame.push_stack(type2, CHECK_VERIFY(this));
1133 current_frame.push_stack(type, CHECK_VERIFY(this));
1134 no_control_flow = false; break;
1135 }
1136 case Bytecodes::_dup2 :
1137 type = current_frame.pop_stack(CHECK_VERIFY(this));
1138 if (type.is_category1()) {
1139 type2 = current_frame.pop_stack(
1140 VerificationType::category1_check(), CHECK_VERIFY(this));
1141 } else if (type.is_category2_2nd()) {
1142 type2 = current_frame.pop_stack(
1143 VerificationType::category2_check(), CHECK_VERIFY(this));
1144 } else {
1145 /* Unreachable? Would need a category2_1st on TOS which does not
1146 * appear possible. */
1147 verify_error(
1148 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1149 bad_type_msg, "dup2");
1150 return;
1151 }
1152 current_frame.push_stack(type2, CHECK_VERIFY(this));
1153 current_frame.push_stack(type, CHECK_VERIFY(this));
1154 current_frame.push_stack(type2, CHECK_VERIFY(this));
1155 current_frame.push_stack(type, CHECK_VERIFY(this));
1156 no_control_flow = false; break;
1157 case Bytecodes::_dup2_x1 :
1158 {
1159 VerificationType type3;
1160 type = current_frame.pop_stack(CHECK_VERIFY(this));
1161 if (type.is_category1()) {
1162 type2 = current_frame.pop_stack(
1163 VerificationType::category1_check(), CHECK_VERIFY(this));
1164 } else if (type.is_category2_2nd()) {
1165 type2 = current_frame.pop_stack(
1166 VerificationType::category2_check(), CHECK_VERIFY(this));
1167 } else {
1168 /* Unreachable? Would need a category2_1st on TOS which does
1169 * not appear possible. */
1170 verify_error(
1171 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1172 bad_type_msg, "dup2_x1");
1173 return;
1174 }
1175 type3 = current_frame.pop_stack(
1176 VerificationType::category1_check(), CHECK_VERIFY(this));
1177 current_frame.push_stack(type2, CHECK_VERIFY(this));
1178 current_frame.push_stack(type, CHECK_VERIFY(this));
1179 current_frame.push_stack(type3, CHECK_VERIFY(this));
1180 current_frame.push_stack(type2, CHECK_VERIFY(this));
1181 current_frame.push_stack(type, CHECK_VERIFY(this));
1182 no_control_flow = false; break;
1183 }
1184 case Bytecodes::_dup2_x2 :
1185 {
1186 VerificationType type3, type4;
1187 type = current_frame.pop_stack(CHECK_VERIFY(this));
1188 if (type.is_category1()) {
1189 type2 = current_frame.pop_stack(
1190 VerificationType::category1_check(), CHECK_VERIFY(this));
1191 } else if (type.is_category2_2nd()) {
1192 type2 = current_frame.pop_stack(
1193 VerificationType::category2_check(), CHECK_VERIFY(this));
1194 } else {
1195 /* Unreachable? Would need a category2_1st on TOS which does
1196 * not appear possible. */
1197 verify_error(
1198 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1199 bad_type_msg, "dup2_x2");
1200 return;
1201 }
1202 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1203 if (type3.is_category1()) {
1204 type4 = current_frame.pop_stack(
1205 VerificationType::category1_check(), CHECK_VERIFY(this));
1206 } else if (type3.is_category2_2nd()) {
1207 type4 = current_frame.pop_stack(
1208 VerificationType::category2_check(), CHECK_VERIFY(this));
1209 } else {
1210 /* Unreachable? Would need a category2_1st on TOS after popping
1211 * a long/double or two category 1's, which does not
1212 * appear possible. */
1213 verify_error(
1214 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1215 bad_type_msg, "dup2_x2");
1216 return;
1217 }
1218 current_frame.push_stack(type2, CHECK_VERIFY(this));
1219 current_frame.push_stack(type, CHECK_VERIFY(this));
1220 current_frame.push_stack(type4, CHECK_VERIFY(this));
1221 current_frame.push_stack(type3, CHECK_VERIFY(this));
1222 current_frame.push_stack(type2, CHECK_VERIFY(this));
1223 current_frame.push_stack(type, CHECK_VERIFY(this));
1224 no_control_flow = false; break;
1225 }
1226 case Bytecodes::_swap :
1227 type = current_frame.pop_stack(
1228 VerificationType::category1_check(), CHECK_VERIFY(this));
1229 type2 = current_frame.pop_stack(
1230 VerificationType::category1_check(), CHECK_VERIFY(this));
1231 current_frame.push_stack(type, CHECK_VERIFY(this));
1232 current_frame.push_stack(type2, CHECK_VERIFY(this));
1233 no_control_flow = false; break;
1234 case Bytecodes::_iadd :
1235 case Bytecodes::_isub :
1236 case Bytecodes::_imul :
1237 case Bytecodes::_idiv :
1238 case Bytecodes::_irem :
1239 case Bytecodes::_ishl :
1240 case Bytecodes::_ishr :
1241 case Bytecodes::_iushr :
1242 case Bytecodes::_ior :
1243 case Bytecodes::_ixor :
1244 case Bytecodes::_iand :
1245 current_frame.pop_stack(
1246 VerificationType::integer_type(), CHECK_VERIFY(this));
1247 // fall through
1248 case Bytecodes::_ineg :
1249 current_frame.pop_stack(
1250 VerificationType::integer_type(), CHECK_VERIFY(this));
1251 current_frame.push_stack(
1252 VerificationType::integer_type(), CHECK_VERIFY(this));
1253 no_control_flow = false; break;
1254 case Bytecodes::_ladd :
1255 case Bytecodes::_lsub :
1256 case Bytecodes::_lmul :
1257 case Bytecodes::_ldiv :
1258 case Bytecodes::_lrem :
1259 case Bytecodes::_land :
1260 case Bytecodes::_lor :
1261 case Bytecodes::_lxor :
1262 current_frame.pop_stack_2(
1263 VerificationType::long2_type(),
1264 VerificationType::long_type(), CHECK_VERIFY(this));
1265 // fall through
1266 case Bytecodes::_lneg :
1267 current_frame.pop_stack_2(
1268 VerificationType::long2_type(),
1269 VerificationType::long_type(), CHECK_VERIFY(this));
1270 current_frame.push_stack_2(
1271 VerificationType::long_type(),
1272 VerificationType::long2_type(), CHECK_VERIFY(this));
1273 no_control_flow = false; break;
1274 case Bytecodes::_lshl :
1275 case Bytecodes::_lshr :
1276 case Bytecodes::_lushr :
1277 current_frame.pop_stack(
1278 VerificationType::integer_type(), CHECK_VERIFY(this));
1279 current_frame.pop_stack_2(
1280 VerificationType::long2_type(),
1281 VerificationType::long_type(), CHECK_VERIFY(this));
1282 current_frame.push_stack_2(
1283 VerificationType::long_type(),
1284 VerificationType::long2_type(), CHECK_VERIFY(this));
1285 no_control_flow = false; break;
1286 case Bytecodes::_fadd :
1287 case Bytecodes::_fsub :
1288 case Bytecodes::_fmul :
1289 case Bytecodes::_fdiv :
1290 case Bytecodes::_frem :
1291 current_frame.pop_stack(
1292 VerificationType::float_type(), CHECK_VERIFY(this));
1293 // fall through
1294 case Bytecodes::_fneg :
1295 current_frame.pop_stack(
1296 VerificationType::float_type(), CHECK_VERIFY(this));
1297 current_frame.push_stack(
1298 VerificationType::float_type(), CHECK_VERIFY(this));
1299 no_control_flow = false; break;
1300 case Bytecodes::_dadd :
1301 case Bytecodes::_dsub :
1302 case Bytecodes::_dmul :
1303 case Bytecodes::_ddiv :
1304 case Bytecodes::_drem :
1305 current_frame.pop_stack_2(
1306 VerificationType::double2_type(),
1307 VerificationType::double_type(), CHECK_VERIFY(this));
1308 // fall through
1309 case Bytecodes::_dneg :
1310 current_frame.pop_stack_2(
1311 VerificationType::double2_type(),
1312 VerificationType::double_type(), CHECK_VERIFY(this));
1313 current_frame.push_stack_2(
1314 VerificationType::double_type(),
1315 VerificationType::double2_type(), CHECK_VERIFY(this));
1316 no_control_flow = false; break;
1317 case Bytecodes::_iinc :
1318 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1319 no_control_flow = false; break;
1320 case Bytecodes::_i2l :
1321 type = current_frame.pop_stack(
1322 VerificationType::integer_type(), CHECK_VERIFY(this));
1323 current_frame.push_stack_2(
1324 VerificationType::long_type(),
1325 VerificationType::long2_type(), CHECK_VERIFY(this));
1326 no_control_flow = false; break;
1327 case Bytecodes::_l2i :
1328 current_frame.pop_stack_2(
1329 VerificationType::long2_type(),
1330 VerificationType::long_type(), CHECK_VERIFY(this));
1331 current_frame.push_stack(
1332 VerificationType::integer_type(), CHECK_VERIFY(this));
1333 no_control_flow = false; break;
1334 case Bytecodes::_i2f :
1335 current_frame.pop_stack(
1336 VerificationType::integer_type(), CHECK_VERIFY(this));
1337 current_frame.push_stack(
1338 VerificationType::float_type(), CHECK_VERIFY(this));
1339 no_control_flow = false; break;
1340 case Bytecodes::_i2d :
1341 current_frame.pop_stack(
1342 VerificationType::integer_type(), CHECK_VERIFY(this));
1343 current_frame.push_stack_2(
1344 VerificationType::double_type(),
1345 VerificationType::double2_type(), CHECK_VERIFY(this));
1346 no_control_flow = false; break;
1347 case Bytecodes::_l2f :
1348 current_frame.pop_stack_2(
1349 VerificationType::long2_type(),
1350 VerificationType::long_type(), CHECK_VERIFY(this));
1351 current_frame.push_stack(
1352 VerificationType::float_type(), CHECK_VERIFY(this));
1353 no_control_flow = false; break;
1354 case Bytecodes::_l2d :
1355 current_frame.pop_stack_2(
1356 VerificationType::long2_type(),
1357 VerificationType::long_type(), CHECK_VERIFY(this));
1358 current_frame.push_stack_2(
1359 VerificationType::double_type(),
1360 VerificationType::double2_type(), CHECK_VERIFY(this));
1361 no_control_flow = false; break;
1362 case Bytecodes::_f2i :
1363 current_frame.pop_stack(
1364 VerificationType::float_type(), CHECK_VERIFY(this));
1365 current_frame.push_stack(
1366 VerificationType::integer_type(), CHECK_VERIFY(this));
1367 no_control_flow = false; break;
1368 case Bytecodes::_f2l :
1369 current_frame.pop_stack(
1370 VerificationType::float_type(), CHECK_VERIFY(this));
1371 current_frame.push_stack_2(
1372 VerificationType::long_type(),
1373 VerificationType::long2_type(), CHECK_VERIFY(this));
1374 no_control_flow = false; break;
1375 case Bytecodes::_f2d :
1376 current_frame.pop_stack(
1377 VerificationType::float_type(), CHECK_VERIFY(this));
1378 current_frame.push_stack_2(
1379 VerificationType::double_type(),
1380 VerificationType::double2_type(), CHECK_VERIFY(this));
1381 no_control_flow = false; break;
1382 case Bytecodes::_d2i :
1383 current_frame.pop_stack_2(
1384 VerificationType::double2_type(),
1385 VerificationType::double_type(), CHECK_VERIFY(this));
1386 current_frame.push_stack(
1387 VerificationType::integer_type(), CHECK_VERIFY(this));
1388 no_control_flow = false; break;
1389 case Bytecodes::_d2l :
1390 current_frame.pop_stack_2(
1391 VerificationType::double2_type(),
1392 VerificationType::double_type(), CHECK_VERIFY(this));
1393 current_frame.push_stack_2(
1394 VerificationType::long_type(),
1395 VerificationType::long2_type(), CHECK_VERIFY(this));
1396 no_control_flow = false; break;
1397 case Bytecodes::_d2f :
1398 current_frame.pop_stack_2(
1399 VerificationType::double2_type(),
1400 VerificationType::double_type(), CHECK_VERIFY(this));
1401 current_frame.push_stack(
1402 VerificationType::float_type(), CHECK_VERIFY(this));
1403 no_control_flow = false; break;
1404 case Bytecodes::_i2b :
1405 case Bytecodes::_i2c :
1406 case Bytecodes::_i2s :
1407 current_frame.pop_stack(
1408 VerificationType::integer_type(), CHECK_VERIFY(this));
1409 current_frame.push_stack(
1410 VerificationType::integer_type(), CHECK_VERIFY(this));
1411 no_control_flow = false; break;
1412 case Bytecodes::_lcmp :
1413 current_frame.pop_stack_2(
1414 VerificationType::long2_type(),
1415 VerificationType::long_type(), CHECK_VERIFY(this));
1416 current_frame.pop_stack_2(
1417 VerificationType::long2_type(),
1418 VerificationType::long_type(), CHECK_VERIFY(this));
1419 current_frame.push_stack(
1420 VerificationType::integer_type(), CHECK_VERIFY(this));
1421 no_control_flow = false; break;
1422 case Bytecodes::_fcmpl :
1423 case Bytecodes::_fcmpg :
1424 current_frame.pop_stack(
1425 VerificationType::float_type(), CHECK_VERIFY(this));
1426 current_frame.pop_stack(
1427 VerificationType::float_type(), CHECK_VERIFY(this));
1428 current_frame.push_stack(
1429 VerificationType::integer_type(), CHECK_VERIFY(this));
1430 no_control_flow = false; break;
1431 case Bytecodes::_dcmpl :
1432 case Bytecodes::_dcmpg :
1433 current_frame.pop_stack_2(
1434 VerificationType::double2_type(),
1435 VerificationType::double_type(), CHECK_VERIFY(this));
1436 current_frame.pop_stack_2(
1437 VerificationType::double2_type(),
1438 VerificationType::double_type(), CHECK_VERIFY(this));
1439 current_frame.push_stack(
1440 VerificationType::integer_type(), CHECK_VERIFY(this));
1441 no_control_flow = false; break;
1442 case Bytecodes::_if_icmpeq:
1443 case Bytecodes::_if_icmpne:
1444 case Bytecodes::_if_icmplt:
1445 case Bytecodes::_if_icmpge:
1446 case Bytecodes::_if_icmpgt:
1447 case Bytecodes::_if_icmple:
1448 current_frame.pop_stack(
1449 VerificationType::integer_type(), CHECK_VERIFY(this));
1450 // fall through
1451 case Bytecodes::_ifeq:
1452 case Bytecodes::_ifne:
1453 case Bytecodes::_iflt:
1454 case Bytecodes::_ifge:
1455 case Bytecodes::_ifgt:
1456 case Bytecodes::_ifle:
1457 current_frame.pop_stack(
1458 VerificationType::integer_type(), CHECK_VERIFY(this));
1459 target = bcs.dest();
1460 stackmap_table.check_jump_target(
1461 ¤t_frame, target, CHECK_VERIFY(this));
1462 no_control_flow = false; break;
1463 case Bytecodes::_if_acmpeq :
1464 case Bytecodes::_if_acmpne :
1465 current_frame.pop_stack(
1466 VerificationType::reference_check(), CHECK_VERIFY(this));
1467 // fall through
1468 case Bytecodes::_ifnull :
1469 case Bytecodes::_ifnonnull :
1470 current_frame.pop_stack(
1471 VerificationType::reference_check(), CHECK_VERIFY(this));
1472 target = bcs.dest();
1473 stackmap_table.check_jump_target
1474 (¤t_frame, target, CHECK_VERIFY(this));
1475 no_control_flow = false; break;
1476 case Bytecodes::_goto :
1477 target = bcs.dest();
1478 stackmap_table.check_jump_target(
1479 ¤t_frame, target, CHECK_VERIFY(this));
1480 no_control_flow = true; break;
1481 case Bytecodes::_goto_w :
1482 target = bcs.dest_w();
1483 stackmap_table.check_jump_target(
1484 ¤t_frame, target, CHECK_VERIFY(this));
1485 no_control_flow = true; break;
1486 case Bytecodes::_tableswitch :
1487 case Bytecodes::_lookupswitch :
1488 verify_switch(
1489 &bcs, code_length, code_data, ¤t_frame,
1490 &stackmap_table, CHECK_VERIFY(this));
1491 no_control_flow = true; break;
1492 case Bytecodes::_ireturn :
1493 type = current_frame.pop_stack(
1494 VerificationType::integer_type(), CHECK_VERIFY(this));
1495 verify_return_value(return_type, type, bci,
1496 ¤t_frame, CHECK_VERIFY(this));
1497 no_control_flow = true; break;
1498 case Bytecodes::_lreturn :
1499 type2 = current_frame.pop_stack(
1500 VerificationType::long2_type(), CHECK_VERIFY(this));
1501 type = current_frame.pop_stack(
1502 VerificationType::long_type(), CHECK_VERIFY(this));
1503 verify_return_value(return_type, type, bci,
1504 ¤t_frame, CHECK_VERIFY(this));
1505 no_control_flow = true; break;
1506 case Bytecodes::_freturn :
1507 type = current_frame.pop_stack(
1508 VerificationType::float_type(), CHECK_VERIFY(this));
1509 verify_return_value(return_type, type, bci,
1510 ¤t_frame, CHECK_VERIFY(this));
1511 no_control_flow = true; break;
1512 case Bytecodes::_dreturn :
1513 type2 = current_frame.pop_stack(
1514 VerificationType::double2_type(), CHECK_VERIFY(this));
1515 type = current_frame.pop_stack(
1516 VerificationType::double_type(), CHECK_VERIFY(this));
1517 verify_return_value(return_type, type, bci,
1518 ¤t_frame, CHECK_VERIFY(this));
1519 no_control_flow = true; break;
1520 case Bytecodes::_areturn :
1521 type = current_frame.pop_stack(
1522 VerificationType::reference_check(), CHECK_VERIFY(this));
1523 verify_return_value(return_type, type, bci,
1524 ¤t_frame, CHECK_VERIFY(this));
1525 no_control_flow = true; break;
1526 case Bytecodes::_return :
1527 if (return_type != VerificationType::bogus_type()) {
1528 verify_error(ErrorContext::bad_code(bci),
1529 "Method expects a return value");
1530 return;
1531 }
1532 // Make sure "this" has been initialized if current method is an
1533 // <init>
1534 if (_method->name() == vmSymbols::object_initializer_name() &&
1535 current_frame.flag_this_uninit()) {
1536 verify_error(ErrorContext::bad_code(bci),
1537 "Constructor must call super() or this() "
1538 "before return");
1539 return;
1540 }
1541 no_control_flow = true; break;
1542 case Bytecodes::_getstatic :
1543 case Bytecodes::_putstatic :
1544 case Bytecodes::_getfield :
1545 case Bytecodes::_putfield :
1546 verify_field_instructions(
1547 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1548 no_control_flow = false; break;
1549 case Bytecodes::_invokevirtual :
1550 case Bytecodes::_invokespecial :
1551 case Bytecodes::_invokestatic :
1552 verify_invoke_instructions(
1553 &bcs, code_length, ¤t_frame,
1554 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1555 no_control_flow = false; break;
1556 case Bytecodes::_invokeinterface :
1557 case Bytecodes::_invokedynamic :
1558 verify_invoke_instructions(
1559 &bcs, code_length, ¤t_frame,
1560 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1561 no_control_flow = false; break;
1562 case Bytecodes::_new :
1563 {
1564 index = bcs.get_index_u2();
1565 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1566 VerificationType new_class_type =
1567 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1568 if (!new_class_type.is_object()) {
1569 verify_error(ErrorContext::bad_type(bci,
1570 TypeOrigin::cp(index, new_class_type)),
1571 "Illegal new instruction");
1572 return;
1573 }
1574 type = VerificationType::uninitialized_type(bci);
1575 current_frame.push_stack(type, CHECK_VERIFY(this));
1576 no_control_flow = false; break;
1577 }
1578 case Bytecodes::_newarray :
1579 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1580 current_frame.pop_stack(
1581 VerificationType::integer_type(), CHECK_VERIFY(this));
1582 current_frame.push_stack(type, CHECK_VERIFY(this));
1583 no_control_flow = false; break;
1584 case Bytecodes::_anewarray :
1585 verify_anewarray(
1586 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1587 no_control_flow = false; break;
1588 case Bytecodes::_arraylength :
1589 type = current_frame.pop_stack(
1590 VerificationType::reference_check(), CHECK_VERIFY(this));
1591 if (!(type.is_null() || type.is_array())) {
1592 verify_error(ErrorContext::bad_type(
1593 bci, current_frame.stack_top_ctx()),
1594 bad_type_msg, "arraylength");
1595 }
1596 current_frame.push_stack(
1597 VerificationType::integer_type(), CHECK_VERIFY(this));
1598 no_control_flow = false; break;
1599 case Bytecodes::_checkcast :
1600 {
1601 index = bcs.get_index_u2();
1602 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1603 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1604 VerificationType klass_type = cp_index_to_type(
1605 index, cp, CHECK_VERIFY(this));
1606 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1607 no_control_flow = false; break;
1608 }
1609 case Bytecodes::_instanceof : {
1610 index = bcs.get_index_u2();
1611 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1612 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1613 current_frame.push_stack(
1614 VerificationType::integer_type(), CHECK_VERIFY(this));
1615 no_control_flow = false; break;
1616 }
1617 case Bytecodes::_monitorenter :
1618 case Bytecodes::_monitorexit :
1619 current_frame.pop_stack(
1620 VerificationType::reference_check(), CHECK_VERIFY(this));
1621 no_control_flow = false; break;
1622 case Bytecodes::_multianewarray :
1623 {
1624 index = bcs.get_index_u2();
1625 u2 dim = *(bcs.bcp()+3);
1626 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1627 VerificationType new_array_type =
1628 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1629 if (!new_array_type.is_array()) {
1630 verify_error(ErrorContext::bad_type(bci,
1631 TypeOrigin::cp(index, new_array_type)),
1632 "Illegal constant pool index in multianewarray instruction");
1633 return;
1634 }
1635 if (dim < 1 || new_array_type.dimensions() < dim) {
1636 verify_error(ErrorContext::bad_code(bci),
1637 "Illegal dimension in multianewarray instruction: %d", dim);
1638 return;
1639 }
1640 for (int i = 0; i < dim; i++) {
1641 current_frame.pop_stack(
1642 VerificationType::integer_type(), CHECK_VERIFY(this));
1643 }
1644 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1645 no_control_flow = false; break;
1646 }
1647 case Bytecodes::_athrow :
1648 type = VerificationType::reference_type(
1649 vmSymbols::java_lang_Throwable());
1650 current_frame.pop_stack(type, CHECK_VERIFY(this));
1651 no_control_flow = true; break;
1652 default:
1653 // We only need to check the valid bytecodes in class file.
1654 // And jsr and ret are not in the new class file format in JDK1.5.
1655 verify_error(ErrorContext::bad_code(bci),
1656 "Bad instruction: %02x", opcode);
1657 no_control_flow = false;
1658 return;
1659 } // end switch
1660 } // end Merge with the next instruction
1662 // Look for possible jump target in exception handlers and see if it
1663 // matches current_frame
1664 if (bci >= ex_min && bci < ex_max) {
1665 verify_exception_handler_targets(
1666 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1667 }
1668 } // end while
1670 // Make sure that control flow does not fall through end of the method
1671 if (!no_control_flow) {
1672 verify_error(ErrorContext::bad_code(code_length),
1673 "Control flow falls through code end");
1674 return;
1675 }
1676 }
1678 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1679 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1680 memset(code_data, 0, sizeof(char) * code_length);
1681 RawBytecodeStream bcs(m);
1683 while (!bcs.is_last_bytecode()) {
1684 if (bcs.raw_next() != Bytecodes::_illegal) {
1685 int bci = bcs.bci();
1686 if (bcs.raw_code() == Bytecodes::_new) {
1687 code_data[bci] = NEW_OFFSET;
1688 } else {
1689 code_data[bci] = BYTECODE_OFFSET;
1690 }
1691 } else {
1692 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1693 return NULL;
1694 }
1695 }
1697 return code_data;
1698 }
1700 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1701 ExceptionTable exhandlers(_method());
1702 int exlength = exhandlers.length();
1703 constantPoolHandle cp (THREAD, _method->constants());
1705 for(int i = 0; i < exlength; i++) {
1706 //reacquire the table in case a GC happened
1707 ExceptionTable exhandlers(_method());
1708 u2 start_pc = exhandlers.start_pc(i);
1709 u2 end_pc = exhandlers.end_pc(i);
1710 u2 handler_pc = exhandlers.handler_pc(i);
1711 if (start_pc >= code_length || code_data[start_pc] == 0) {
1712 class_format_error("Illegal exception table start_pc %d", start_pc);
1713 return;
1714 }
1715 if (end_pc != code_length) { // special case: end_pc == code_length
1716 if (end_pc > code_length || code_data[end_pc] == 0) {
1717 class_format_error("Illegal exception table end_pc %d", end_pc);
1718 return;
1719 }
1720 }
1721 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1722 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1723 return;
1724 }
1725 int catch_type_index = exhandlers.catch_type_index(i);
1726 if (catch_type_index != 0) {
1727 VerificationType catch_type = cp_index_to_type(
1728 catch_type_index, cp, CHECK_VERIFY(this));
1729 VerificationType throwable =
1730 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1731 bool is_subclass = throwable.is_assignable_from(
1732 catch_type, this, CHECK_VERIFY(this));
1733 if (!is_subclass) {
1734 // 4286534: should throw VerifyError according to recent spec change
1735 verify_error(ErrorContext::bad_type(handler_pc,
1736 TypeOrigin::cp(catch_type_index, catch_type),
1737 TypeOrigin::implicit(throwable)),
1738 "Catch type is not a subclass "
1739 "of Throwable in exception handler %d", handler_pc);
1740 return;
1741 }
1742 }
1743 if (start_pc < min) min = start_pc;
1744 if (end_pc > max) max = end_pc;
1745 }
1746 }
1748 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1749 int localvariable_table_length = _method()->localvariable_table_length();
1750 if (localvariable_table_length > 0) {
1751 LocalVariableTableElement* table = _method()->localvariable_table_start();
1752 for (int i = 0; i < localvariable_table_length; i++) {
1753 u2 start_bci = table[i].start_bci;
1754 u2 length = table[i].length;
1756 if (start_bci >= code_length || code_data[start_bci] == 0) {
1757 class_format_error(
1758 "Illegal local variable table start_pc %d", start_bci);
1759 return;
1760 }
1761 u4 end_bci = (u4)(start_bci + length);
1762 if (end_bci != code_length) {
1763 if (end_bci >= code_length || code_data[end_bci] == 0) {
1764 class_format_error( "Illegal local variable table length %d", length);
1765 return;
1766 }
1767 }
1768 }
1769 }
1770 }
1772 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1773 StackMapFrame* current_frame,
1774 StackMapTable* stackmap_table,
1775 bool no_control_flow, TRAPS) {
1776 if (stackmap_index < stackmap_table->get_frame_count()) {
1777 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1778 if (no_control_flow && this_offset > bci) {
1779 verify_error(ErrorContext::missing_stackmap(bci),
1780 "Expecting a stack map frame");
1781 return 0;
1782 }
1783 if (this_offset == bci) {
1784 ErrorContext ctx;
1785 // See if current stack map can be assigned to the frame in table.
1786 // current_frame is the stackmap frame got from the last instruction.
1787 // If matched, current_frame will be updated by this method.
1788 bool matches = stackmap_table->match_stackmap(
1789 current_frame, this_offset, stackmap_index,
1790 !no_control_flow, true, &ctx, CHECK_VERIFY_(this, 0));
1791 if (!matches) {
1792 // report type error
1793 verify_error(ctx, "Instruction type does not match stack map");
1794 return 0;
1795 }
1796 stackmap_index++;
1797 } else if (this_offset < bci) {
1798 // current_offset should have met this_offset.
1799 class_format_error("Bad stack map offset %d", this_offset);
1800 return 0;
1801 }
1802 } else if (no_control_flow) {
1803 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1804 return 0;
1805 }
1806 return stackmap_index;
1807 }
1809 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1810 StackMapTable* stackmap_table, TRAPS) {
1811 constantPoolHandle cp (THREAD, _method->constants());
1812 ExceptionTable exhandlers(_method());
1813 int exlength = exhandlers.length();
1814 for(int i = 0; i < exlength; i++) {
1815 //reacquire the table in case a GC happened
1816 ExceptionTable exhandlers(_method());
1817 u2 start_pc = exhandlers.start_pc(i);
1818 u2 end_pc = exhandlers.end_pc(i);
1819 u2 handler_pc = exhandlers.handler_pc(i);
1820 int catch_type_index = exhandlers.catch_type_index(i);
1821 if(bci >= start_pc && bci < end_pc) {
1822 u1 flags = current_frame->flags();
1823 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1824 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1825 if (catch_type_index != 0) {
1826 // We know that this index refers to a subclass of Throwable
1827 VerificationType catch_type = cp_index_to_type(
1828 catch_type_index, cp, CHECK_VERIFY(this));
1829 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1830 } else {
1831 VerificationType throwable =
1832 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1833 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1834 }
1835 ErrorContext ctx;
1836 bool matches = stackmap_table->match_stackmap(
1837 new_frame, handler_pc, true, false, &ctx, CHECK_VERIFY(this));
1838 if (!matches) {
1839 verify_error(ctx, "Stack map does not match the one at "
1840 "exception handler %d", handler_pc);
1841 return;
1842 }
1843 }
1844 }
1845 }
1847 void ClassVerifier::verify_cp_index(
1848 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1849 int nconstants = cp->length();
1850 if ((index <= 0) || (index >= nconstants)) {
1851 verify_error(ErrorContext::bad_cp_index(bci, index),
1852 "Illegal constant pool index %d in class %s",
1853 index, cp->pool_holder()->external_name());
1854 return;
1855 }
1856 }
1858 void ClassVerifier::verify_cp_type(
1859 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1861 // In some situations, bytecode rewriting may occur while we're verifying.
1862 // In this case, a constant pool cache exists and some indices refer to that
1863 // instead. Be sure we don't pick up such indices by accident.
1864 // We must check was_recursively_verified() before we get here.
1865 guarantee(cp->cache() == NULL, "not rewritten yet");
1867 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1868 unsigned int tag = cp->tag_at(index).value();
1869 if ((types & (1 << tag)) == 0) {
1870 verify_error(ErrorContext::bad_cp_index(bci, index),
1871 "Illegal type at constant pool entry %d in class %s",
1872 index, cp->pool_holder()->external_name());
1873 return;
1874 }
1875 }
1877 void ClassVerifier::verify_cp_class_type(
1878 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1879 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1880 constantTag tag = cp->tag_at(index);
1881 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1882 verify_error(ErrorContext::bad_cp_index(bci, index),
1883 "Illegal type at constant pool entry %d in class %s",
1884 index, cp->pool_holder()->external_name());
1885 return;
1886 }
1887 }
1889 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1890 stringStream ss;
1892 ctx.reset_frames();
1893 _exception_type = vmSymbols::java_lang_VerifyError();
1894 _error_context = ctx;
1895 va_list va;
1896 va_start(va, msg);
1897 ss.vprint(msg, va);
1898 va_end(va);
1899 _message = ss.as_string();
1900 #ifdef ASSERT
1901 ResourceMark rm;
1902 const char* exception_name = _exception_type->as_C_string();
1903 Exceptions::debug_check_abort(exception_name, NULL);
1904 #endif // ndef ASSERT
1905 }
1907 void ClassVerifier::class_format_error(const char* msg, ...) {
1908 stringStream ss;
1909 _exception_type = vmSymbols::java_lang_ClassFormatError();
1910 va_list va;
1911 va_start(va, msg);
1912 ss.vprint(msg, va);
1913 va_end(va);
1914 if (!_method.is_null()) {
1915 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1916 }
1917 _message = ss.as_string();
1918 }
1920 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1921 // Get current loader and protection domain first.
1922 oop loader = current_class()->class_loader();
1923 oop protection_domain = current_class()->protection_domain();
1925 return SystemDictionary::resolve_or_fail(
1926 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1927 true, CHECK_NULL);
1928 }
1930 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1931 Klass* target_class,
1932 Symbol* field_name,
1933 Symbol* field_sig,
1934 bool is_method) {
1935 No_Safepoint_Verifier nosafepoint;
1937 // If target class isn't a super class of this class, we don't worry about this case
1938 if (!this_class->is_subclass_of(target_class)) {
1939 return false;
1940 }
1941 // Check if the specified method or field is protected
1942 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1943 fieldDescriptor fd;
1944 if (is_method) {
1945 Method* m = target_instance->uncached_lookup_method(field_name, field_sig);
1946 if (m != NULL && m->is_protected()) {
1947 if (!this_class->is_same_class_package(m->method_holder())) {
1948 return true;
1949 }
1950 }
1951 } else {
1952 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1953 if (member_klass != NULL && fd.is_protected()) {
1954 if (!this_class->is_same_class_package(member_klass)) {
1955 return true;
1956 }
1957 }
1958 }
1959 return false;
1960 }
1962 void ClassVerifier::verify_ldc(
1963 int opcode, u2 index, StackMapFrame* current_frame,
1964 constantPoolHandle cp, u2 bci, TRAPS) {
1965 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1966 constantTag tag = cp->tag_at(index);
1967 unsigned int types;
1968 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1969 if (!tag.is_unresolved_klass()) {
1970 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1971 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1972 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1973 // Note: The class file parser already verified the legality of
1974 // MethodHandle and MethodType constants.
1975 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1976 }
1977 } else {
1978 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1979 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1980 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1981 }
1982 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1983 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1984 } else if (tag.is_string()) {
1985 current_frame->push_stack(
1986 VerificationType::reference_type(
1987 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1988 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1989 current_frame->push_stack(
1990 VerificationType::reference_type(
1991 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
1992 } else if (tag.is_int()) {
1993 current_frame->push_stack(
1994 VerificationType::integer_type(), CHECK_VERIFY(this));
1995 } else if (tag.is_float()) {
1996 current_frame->push_stack(
1997 VerificationType::float_type(), CHECK_VERIFY(this));
1998 } else if (tag.is_double()) {
1999 current_frame->push_stack_2(
2000 VerificationType::double_type(),
2001 VerificationType::double2_type(), CHECK_VERIFY(this));
2002 } else if (tag.is_long()) {
2003 current_frame->push_stack_2(
2004 VerificationType::long_type(),
2005 VerificationType::long2_type(), CHECK_VERIFY(this));
2006 } else if (tag.is_method_handle()) {
2007 current_frame->push_stack(
2008 VerificationType::reference_type(
2009 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2010 } else if (tag.is_method_type()) {
2011 current_frame->push_stack(
2012 VerificationType::reference_type(
2013 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2014 } else {
2015 /* Unreachable? verify_cp_type has already validated the cp type. */
2016 verify_error(
2017 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2018 return;
2019 }
2020 }
2022 void ClassVerifier::verify_switch(
2023 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2024 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2025 int bci = bcs->bci();
2026 address bcp = bcs->bcp();
2027 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2029 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2030 // 4639449 & 4647081: padding bytes must be 0
2031 u2 padding_offset = 1;
2032 while ((bcp + padding_offset) < aligned_bcp) {
2033 if(*(bcp + padding_offset) != 0) {
2034 verify_error(ErrorContext::bad_code(bci),
2035 "Nonzero padding byte in lookswitch or tableswitch");
2036 return;
2037 }
2038 padding_offset++;
2039 }
2040 }
2042 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2043 int keys, delta;
2044 current_frame->pop_stack(
2045 VerificationType::integer_type(), CHECK_VERIFY(this));
2046 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2047 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2048 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2049 if (low > high) {
2050 verify_error(ErrorContext::bad_code(bci),
2051 "low must be less than or equal to high in tableswitch");
2052 return;
2053 }
2054 keys = high - low + 1;
2055 if (keys < 0) {
2056 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2057 return;
2058 }
2059 delta = 1;
2060 } else {
2061 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2062 if (keys < 0) {
2063 verify_error(ErrorContext::bad_code(bci),
2064 "number of keys in lookupswitch less than 0");
2065 return;
2066 }
2067 delta = 2;
2068 // Make sure that the lookupswitch items are sorted
2069 for (int i = 0; i < (keys - 1); i++) {
2070 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2071 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2072 if (this_key >= next_key) {
2073 verify_error(ErrorContext::bad_code(bci),
2074 "Bad lookupswitch instruction");
2075 return;
2076 }
2077 }
2078 }
2079 int target = bci + default_offset;
2080 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2081 for (int i = 0; i < keys; i++) {
2082 // Because check_jump_target() may safepoint, the bytecode could have
2083 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2084 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2085 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2086 stackmap_table->check_jump_target(
2087 current_frame, target, CHECK_VERIFY(this));
2088 }
2089 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2090 }
2092 bool ClassVerifier::name_in_supers(
2093 Symbol* ref_name, instanceKlassHandle current) {
2094 Klass* super = current->super();
2095 while (super != NULL) {
2096 if (super->name() == ref_name) {
2097 return true;
2098 }
2099 super = super->super();
2100 }
2101 return false;
2102 }
2104 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2105 StackMapFrame* current_frame,
2106 constantPoolHandle cp,
2107 TRAPS) {
2108 u2 index = bcs->get_index_u2();
2109 verify_cp_type(bcs->bci(), index, cp,
2110 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2112 // Get field name and signature
2113 Symbol* field_name = cp->name_ref_at(index);
2114 Symbol* field_sig = cp->signature_ref_at(index);
2116 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2117 class_format_error(
2118 "Invalid signature for field in class %s referenced "
2119 "from constant pool index %d", _klass->external_name(), index);
2120 return;
2121 }
2123 // Get referenced class type
2124 VerificationType ref_class_type = cp_ref_index_to_type(
2125 index, cp, CHECK_VERIFY(this));
2126 if (!ref_class_type.is_object()) {
2127 /* Unreachable? Class file parser verifies Fieldref contents */
2128 verify_error(ErrorContext::bad_type(bcs->bci(),
2129 TypeOrigin::cp(index, ref_class_type)),
2130 "Expecting reference to class in class %s at constant pool index %d",
2131 _klass->external_name(), index);
2132 return;
2133 }
2134 VerificationType target_class_type = ref_class_type;
2136 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2137 "buffer type must match VerificationType size");
2138 uintptr_t field_type_buffer[2];
2139 VerificationType* field_type = (VerificationType*)field_type_buffer;
2140 // If we make a VerificationType[2] array directly, the compiler calls
2141 // to the c-runtime library to do the allocation instead of just
2142 // stack allocating it. Plus it would run constructors. This shows up
2143 // in performance profiles.
2145 SignatureStream sig_stream(field_sig, false);
2146 VerificationType stack_object_type;
2147 int n = change_sig_to_verificationType(
2148 &sig_stream, field_type, CHECK_VERIFY(this));
2149 u2 bci = bcs->bci();
2150 bool is_assignable;
2151 switch (bcs->raw_code()) {
2152 case Bytecodes::_getstatic: {
2153 for (int i = 0; i < n; i++) {
2154 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2155 }
2156 break;
2157 }
2158 case Bytecodes::_putstatic: {
2159 for (int i = n - 1; i >= 0; i--) {
2160 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2161 }
2162 break;
2163 }
2164 case Bytecodes::_getfield: {
2165 stack_object_type = current_frame->pop_stack(
2166 target_class_type, CHECK_VERIFY(this));
2167 for (int i = 0; i < n; i++) {
2168 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2169 }
2170 goto check_protected;
2171 }
2172 case Bytecodes::_putfield: {
2173 for (int i = n - 1; i >= 0; i--) {
2174 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2175 }
2176 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2178 // The JVMS 2nd edition allows field initialization before the superclass
2179 // initializer, if the field is defined within the current class.
2180 fieldDescriptor fd;
2181 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2182 target_class_type.equals(current_type()) &&
2183 _klass->find_local_field(field_name, field_sig, &fd)) {
2184 stack_object_type = current_type();
2185 }
2186 is_assignable = target_class_type.is_assignable_from(
2187 stack_object_type, this, CHECK_VERIFY(this));
2188 if (!is_assignable) {
2189 verify_error(ErrorContext::bad_type(bci,
2190 current_frame->stack_top_ctx(),
2191 TypeOrigin::cp(index, target_class_type)),
2192 "Bad type on operand stack in putfield");
2193 return;
2194 }
2195 }
2196 check_protected: {
2197 if (_this_type == stack_object_type)
2198 break; // stack_object_type must be assignable to _current_class_type
2199 Symbol* ref_class_name =
2200 cp->klass_name_at(cp->klass_ref_index_at(index));
2201 if (!name_in_supers(ref_class_name, current_class()))
2202 // stack_object_type must be assignable to _current_class_type since:
2203 // 1. stack_object_type must be assignable to ref_class.
2204 // 2. ref_class must be _current_class or a subclass of it. It can't
2205 // be a superclass of it. See revised JVMS 5.4.4.
2206 break;
2208 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2209 if (is_protected_access(current_class(), ref_class_oop, field_name,
2210 field_sig, false)) {
2211 // It's protected access, check if stack object is assignable to
2212 // current class.
2213 is_assignable = current_type().is_assignable_from(
2214 stack_object_type, this, CHECK_VERIFY(this));
2215 if (!is_assignable) {
2216 verify_error(ErrorContext::bad_type(bci,
2217 current_frame->stack_top_ctx(),
2218 TypeOrigin::implicit(current_type())),
2219 "Bad access to protected data in getfield");
2220 return;
2221 }
2222 }
2223 break;
2224 }
2225 default: ShouldNotReachHere();
2226 }
2227 }
2229 void ClassVerifier::verify_invoke_init(
2230 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2231 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2232 constantPoolHandle cp, TRAPS) {
2233 u2 bci = bcs->bci();
2234 VerificationType type = current_frame->pop_stack(
2235 VerificationType::reference_check(), CHECK_VERIFY(this));
2236 if (type == VerificationType::uninitialized_this_type()) {
2237 // The method must be an <init> method of this class or its superclass
2238 Klass* superk = current_class()->super();
2239 if (ref_class_type.name() != current_class()->name() &&
2240 ref_class_type.name() != superk->name()) {
2241 verify_error(ErrorContext::bad_type(bci,
2242 TypeOrigin::implicit(ref_class_type),
2243 TypeOrigin::implicit(current_type())),
2244 "Bad <init> method call");
2245 return;
2246 }
2247 current_frame->initialize_object(type, current_type());
2248 *this_uninit = true;
2249 } else if (type.is_uninitialized()) {
2250 u2 new_offset = type.bci();
2251 address new_bcp = bcs->bcp() - bci + new_offset;
2252 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2253 /* Unreachable? Stack map parsing ensures valid type and new
2254 * instructions have a valid BCI. */
2255 verify_error(ErrorContext::bad_code(new_offset),
2256 "Expecting new instruction");
2257 return;
2258 }
2259 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2260 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2262 // The method must be an <init> method of the indicated class
2263 VerificationType new_class_type = cp_index_to_type(
2264 new_class_index, cp, CHECK_VERIFY(this));
2265 if (!new_class_type.equals(ref_class_type)) {
2266 verify_error(ErrorContext::bad_type(bci,
2267 TypeOrigin::cp(new_class_index, new_class_type),
2268 TypeOrigin::cp(ref_class_index, ref_class_type)),
2269 "Call to wrong <init> method");
2270 return;
2271 }
2272 // According to the VM spec, if the referent class is a superclass of the
2273 // current class, and is in a different runtime package, and the method is
2274 // protected, then the objectref must be the current class or a subclass
2275 // of the current class.
2276 VerificationType objectref_type = new_class_type;
2277 if (name_in_supers(ref_class_type.name(), current_class())) {
2278 Klass* ref_klass = load_class(
2279 ref_class_type.name(), CHECK_VERIFY(this));
2280 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2281 vmSymbols::object_initializer_name(),
2282 cp->signature_ref_at(bcs->get_index_u2()));
2283 instanceKlassHandle mh(THREAD, m->method_holder());
2284 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2285 bool assignable = current_type().is_assignable_from(
2286 objectref_type, this, CHECK_VERIFY(this));
2287 if (!assignable) {
2288 verify_error(ErrorContext::bad_type(bci,
2289 TypeOrigin::cp(new_class_index, objectref_type),
2290 TypeOrigin::implicit(current_type())),
2291 "Bad access to protected <init> method");
2292 return;
2293 }
2294 }
2295 }
2296 current_frame->initialize_object(type, new_class_type);
2297 } else {
2298 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2299 "Bad operand type when invoking <init>");
2300 return;
2301 }
2302 }
2304 void ClassVerifier::verify_invoke_instructions(
2305 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2306 bool *this_uninit, VerificationType return_type,
2307 constantPoolHandle cp, TRAPS) {
2308 // Make sure the constant pool item is the right type
2309 u2 index = bcs->get_index_u2();
2310 Bytecodes::Code opcode = bcs->raw_code();
2311 unsigned int types;
2312 switch (opcode) {
2313 case Bytecodes::_invokeinterface:
2314 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2315 break;
2316 case Bytecodes::_invokedynamic:
2317 types = 1 << JVM_CONSTANT_InvokeDynamic;
2318 break;
2319 case Bytecodes::_invokespecial:
2320 types = (1 << JVM_CONSTANT_InterfaceMethodref) |
2321 (1 << JVM_CONSTANT_Methodref);
2322 break;
2323 default:
2324 types = 1 << JVM_CONSTANT_Methodref;
2325 }
2326 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2328 // Get method name and signature
2329 Symbol* method_name = cp->name_ref_at(index);
2330 Symbol* method_sig = cp->signature_ref_at(index);
2332 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2333 class_format_error(
2334 "Invalid method signature in class %s referenced "
2335 "from constant pool index %d", _klass->external_name(), index);
2336 return;
2337 }
2339 // Get referenced class type
2340 VerificationType ref_class_type;
2341 if (opcode == Bytecodes::_invokedynamic) {
2342 if (!EnableInvokeDynamic ||
2343 _klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2344 class_format_error(
2345 (!EnableInvokeDynamic ?
2346 "invokedynamic instructions not enabled in this JVM" :
2347 "invokedynamic instructions not supported by this class file version"),
2348 _klass->external_name());
2349 return;
2350 }
2351 } else {
2352 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2353 }
2355 // For a small signature length, we just allocate 128 bytes instead
2356 // of parsing the signature once to find its size.
2357 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2358 // longs/doubles to be consertive.
2359 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2360 "buffer type must match VerificationType size");
2361 uintptr_t on_stack_sig_types_buffer[128];
2362 // If we make a VerificationType[128] array directly, the compiler calls
2363 // to the c-runtime library to do the allocation instead of just
2364 // stack allocating it. Plus it would run constructors. This shows up
2365 // in performance profiles.
2367 VerificationType* sig_types;
2368 int size = (method_sig->utf8_length() - 3) * 2;
2369 if (size > 128) {
2370 // Long and double occupies two slots here.
2371 ArgumentSizeComputer size_it(method_sig);
2372 size = size_it.size();
2373 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2374 } else{
2375 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2376 }
2377 SignatureStream sig_stream(method_sig);
2378 int sig_i = 0;
2379 while (!sig_stream.at_return_type()) {
2380 sig_i += change_sig_to_verificationType(
2381 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2382 sig_stream.next();
2383 }
2384 int nargs = sig_i;
2386 #ifdef ASSERT
2387 {
2388 ArgumentSizeComputer size_it(method_sig);
2389 assert(nargs == size_it.size(), "Argument sizes do not match");
2390 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2391 }
2392 #endif
2394 // Check instruction operands
2395 u2 bci = bcs->bci();
2396 if (opcode == Bytecodes::_invokeinterface) {
2397 address bcp = bcs->bcp();
2398 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2399 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2400 // the difference between the size of the operand stack before and after the instruction
2401 // executes.
2402 if (*(bcp+3) != (nargs+1)) {
2403 verify_error(ErrorContext::bad_code(bci),
2404 "Inconsistent args count operand in invokeinterface");
2405 return;
2406 }
2407 if (*(bcp+4) != 0) {
2408 verify_error(ErrorContext::bad_code(bci),
2409 "Fourth operand byte of invokeinterface must be zero");
2410 return;
2411 }
2412 }
2414 if (opcode == Bytecodes::_invokedynamic) {
2415 address bcp = bcs->bcp();
2416 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2417 verify_error(ErrorContext::bad_code(bci),
2418 "Third and fourth operand bytes of invokedynamic must be zero");
2419 return;
2420 }
2421 }
2423 if (method_name->byte_at(0) == '<') {
2424 // Make sure <init> can only be invoked by invokespecial
2425 if (opcode != Bytecodes::_invokespecial ||
2426 method_name != vmSymbols::object_initializer_name()) {
2427 verify_error(ErrorContext::bad_code(bci),
2428 "Illegal call to internal method");
2429 return;
2430 }
2431 } else if (opcode == Bytecodes::_invokespecial
2432 && !ref_class_type.equals(current_type())
2433 && !ref_class_type.equals(VerificationType::reference_type(
2434 current_class()->super()->name()))) {
2435 bool subtype = ref_class_type.is_assignable_from(
2436 current_type(), this, CHECK_VERIFY(this));
2437 if (!subtype) {
2438 verify_error(ErrorContext::bad_code(bci),
2439 "Bad invokespecial instruction: "
2440 "current class isn't assignable to reference class.");
2441 return;
2442 }
2443 }
2444 // Match method descriptor with operand stack
2445 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2446 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2447 }
2448 // Check objectref on operand stack
2449 if (opcode != Bytecodes::_invokestatic &&
2450 opcode != Bytecodes::_invokedynamic) {
2451 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2452 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2453 code_length, this_uninit, cp, CHECK_VERIFY(this));
2454 } else { // other methods
2455 // Ensures that target class is assignable to method class.
2456 if (opcode == Bytecodes::_invokespecial) {
2457 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2458 } else if (opcode == Bytecodes::_invokevirtual) {
2459 VerificationType stack_object_type =
2460 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2461 if (current_type() != stack_object_type) {
2462 assert(cp->cache() == NULL, "not rewritten yet");
2463 Symbol* ref_class_name =
2464 cp->klass_name_at(cp->klass_ref_index_at(index));
2465 // See the comments in verify_field_instructions() for
2466 // the rationale behind this.
2467 if (name_in_supers(ref_class_name, current_class())) {
2468 Klass* ref_class = load_class(ref_class_name, CHECK);
2469 if (is_protected_access(
2470 _klass, ref_class, method_name, method_sig, true)) {
2471 // It's protected access, check if stack object is
2472 // assignable to current class.
2473 bool is_assignable = current_type().is_assignable_from(
2474 stack_object_type, this, CHECK_VERIFY(this));
2475 if (!is_assignable) {
2476 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2477 && stack_object_type.is_array()
2478 && method_name == vmSymbols::clone_name()) {
2479 // Special case: arrays pretend to implement public Object
2480 // clone().
2481 } else {
2482 verify_error(ErrorContext::bad_type(bci,
2483 current_frame->stack_top_ctx(),
2484 TypeOrigin::implicit(current_type())),
2485 "Bad access to protected data in invokevirtual");
2486 return;
2487 }
2488 }
2489 }
2490 }
2491 }
2492 } else {
2493 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2494 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2495 }
2496 }
2497 }
2498 // Push the result type.
2499 if (sig_stream.type() != T_VOID) {
2500 if (method_name == vmSymbols::object_initializer_name()) {
2501 // <init> method must have a void return type
2502 /* Unreachable? Class file parser verifies that methods with '<' have
2503 * void return */
2504 verify_error(ErrorContext::bad_code(bci),
2505 "Return type must be void in <init> method");
2506 return;
2507 }
2508 VerificationType return_type[2];
2509 int n = change_sig_to_verificationType(
2510 &sig_stream, return_type, CHECK_VERIFY(this));
2511 for (int i = 0; i < n; i++) {
2512 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2513 }
2514 }
2515 }
2517 VerificationType ClassVerifier::get_newarray_type(
2518 u2 index, u2 bci, TRAPS) {
2519 const char* from_bt[] = {
2520 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2521 };
2522 if (index < T_BOOLEAN || index > T_LONG) {
2523 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2524 return VerificationType::bogus_type();
2525 }
2527 // from_bt[index] contains the array signature which has a length of 2
2528 Symbol* sig = create_temporary_symbol(
2529 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2530 return VerificationType::reference_type(sig);
2531 }
2533 void ClassVerifier::verify_anewarray(
2534 u2 bci, u2 index, constantPoolHandle cp,
2535 StackMapFrame* current_frame, TRAPS) {
2536 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2537 current_frame->pop_stack(
2538 VerificationType::integer_type(), CHECK_VERIFY(this));
2540 VerificationType component_type =
2541 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2542 int length;
2543 char* arr_sig_str;
2544 if (component_type.is_array()) { // it's an array
2545 const char* component_name = component_type.name()->as_utf8();
2546 // add one dimension to component
2547 length = (int)strlen(component_name) + 1;
2548 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2549 arr_sig_str[0] = '[';
2550 strncpy(&arr_sig_str[1], component_name, length - 1);
2551 } else { // it's an object or interface
2552 const char* component_name = component_type.name()->as_utf8();
2553 // add one dimension to component with 'L' prepended and ';' postpended.
2554 length = (int)strlen(component_name) + 3;
2555 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2556 arr_sig_str[0] = '[';
2557 arr_sig_str[1] = 'L';
2558 strncpy(&arr_sig_str[2], component_name, length - 2);
2559 arr_sig_str[length - 1] = ';';
2560 }
2561 Symbol* arr_sig = create_temporary_symbol(
2562 arr_sig_str, length, CHECK_VERIFY(this));
2563 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2564 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2565 }
2567 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2568 current_frame->get_local(
2569 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2570 current_frame->push_stack(
2571 VerificationType::integer_type(), CHECK_VERIFY(this));
2572 }
2574 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2575 current_frame->get_local_2(
2576 index, VerificationType::long_type(),
2577 VerificationType::long2_type(), CHECK_VERIFY(this));
2578 current_frame->push_stack_2(
2579 VerificationType::long_type(),
2580 VerificationType::long2_type(), CHECK_VERIFY(this));
2581 }
2583 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2584 current_frame->get_local(
2585 index, VerificationType::float_type(), CHECK_VERIFY(this));
2586 current_frame->push_stack(
2587 VerificationType::float_type(), CHECK_VERIFY(this));
2588 }
2590 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2591 current_frame->get_local_2(
2592 index, VerificationType::double_type(),
2593 VerificationType::double2_type(), CHECK_VERIFY(this));
2594 current_frame->push_stack_2(
2595 VerificationType::double_type(),
2596 VerificationType::double2_type(), CHECK_VERIFY(this));
2597 }
2599 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2600 VerificationType type = current_frame->get_local(
2601 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2602 current_frame->push_stack(type, CHECK_VERIFY(this));
2603 }
2605 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2606 current_frame->pop_stack(
2607 VerificationType::integer_type(), CHECK_VERIFY(this));
2608 current_frame->set_local(
2609 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2610 }
2612 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2613 current_frame->pop_stack_2(
2614 VerificationType::long2_type(),
2615 VerificationType::long_type(), CHECK_VERIFY(this));
2616 current_frame->set_local_2(
2617 index, VerificationType::long_type(),
2618 VerificationType::long2_type(), CHECK_VERIFY(this));
2619 }
2621 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2622 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2623 current_frame->set_local(
2624 index, VerificationType::float_type(), CHECK_VERIFY(this));
2625 }
2627 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2628 current_frame->pop_stack_2(
2629 VerificationType::double2_type(),
2630 VerificationType::double_type(), CHECK_VERIFY(this));
2631 current_frame->set_local_2(
2632 index, VerificationType::double_type(),
2633 VerificationType::double2_type(), CHECK_VERIFY(this));
2634 }
2636 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2637 VerificationType type = current_frame->pop_stack(
2638 VerificationType::reference_check(), CHECK_VERIFY(this));
2639 current_frame->set_local(index, type, CHECK_VERIFY(this));
2640 }
2642 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2643 VerificationType type = current_frame->get_local(
2644 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2645 current_frame->set_local(index, type, CHECK_VERIFY(this));
2646 }
2648 void ClassVerifier::verify_return_value(
2649 VerificationType return_type, VerificationType type, u2 bci,
2650 StackMapFrame* current_frame, TRAPS) {
2651 if (return_type == VerificationType::bogus_type()) {
2652 verify_error(ErrorContext::bad_type(bci,
2653 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2654 "Method expects a return value");
2655 return;
2656 }
2657 bool match = return_type.is_assignable_from(type, this, CHECK_VERIFY(this));
2658 if (!match) {
2659 verify_error(ErrorContext::bad_type(bci,
2660 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2661 "Bad return type");
2662 return;
2663 }
2664 }
2666 // The verifier creates symbols which are substrings of Symbols.
2667 // These are stored in the verifier until the end of verification so that
2668 // they can be reference counted.
2669 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2670 int end, TRAPS) {
2671 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2672 _symbols->push(sym);
2673 return sym;
2674 }
2676 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2677 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2678 _symbols->push(sym);
2679 return sym;
2680 }
