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src/share/vm/classfile/verifier.cpp@2c6ef90f030a
src/share/vm/classfile/verifier.cpp
Mon, 07 Jul 2014 10:12:40 +0200
- author
- stefank
- date
- Mon, 07 Jul 2014 10:12:40 +0200
- changeset 6992
- 2c6ef90f030a
- parent 6956
- d14a18794c90
- child 7042
- 92baebeb744b
- permissions
- -rw-r--r--
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
1 /*
2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/stackMapTable.hpp"
29 #include "classfile/stackMapFrame.hpp"
30 #include "classfile/stackMapTableFormat.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/bytecodeStream.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "oops/typeArrayOop.hpp"
41 #include "prims/jvm.h"
42 #include "runtime/fieldDescriptor.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/orderAccess.inline.hpp"
47 #include "runtime/os.hpp"
48 #ifdef TARGET_ARCH_x86
49 # include "bytes_x86.hpp"
50 #endif
51 #ifdef TARGET_ARCH_sparc
52 # include "bytes_sparc.hpp"
53 #endif
54 #ifdef TARGET_ARCH_zero
55 # include "bytes_zero.hpp"
56 #endif
57 #ifdef TARGET_ARCH_arm
58 # include "bytes_arm.hpp"
59 #endif
60 #ifdef TARGET_ARCH_ppc
61 # include "bytes_ppc.hpp"
62 #endif
64 #define NOFAILOVER_MAJOR_VERSION 51
65 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
66 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
68 // Access to external entry for VerifyClassCodes - old byte code verifier
70 extern "C" {
71 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
72 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
73 }
75 static void* volatile _verify_byte_codes_fn = NULL;
77 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
79 static void* verify_byte_codes_fn() {
80 if (_verify_byte_codes_fn == NULL) {
81 void *lib_handle = os::native_java_library();
82 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
83 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
84 if (func == NULL) {
85 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
86 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
87 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
88 }
89 }
90 return (void*)_verify_byte_codes_fn;
91 }
94 // Methods in Verifier
96 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
97 return (class_loader == NULL || !should_verify_class) ?
98 BytecodeVerificationLocal : BytecodeVerificationRemote;
99 }
101 bool Verifier::relax_verify_for(oop loader) {
102 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
103 bool need_verify =
104 // verifyAll
105 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
106 // verifyRemote
107 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
108 return !need_verify;
109 }
111 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
112 HandleMark hm;
113 ResourceMark rm(THREAD);
115 Symbol* exception_name = NULL;
116 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
117 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
118 char* exception_message = message_buffer;
120 const char* klassName = klass->external_name();
121 bool can_failover = FailOverToOldVerifier &&
122 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
124 // If the class should be verified, first see if we can use the split
125 // verifier. If not, or if verification fails and FailOverToOldVerifier
126 // is set, then call the inference verifier.
127 if (is_eligible_for_verification(klass, should_verify_class)) {
128 if (TraceClassInitialization) {
129 tty->print_cr("Start class verification for: %s", klassName);
130 }
131 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
132 ClassVerifier split_verifier(klass, THREAD);
133 split_verifier.verify_class(THREAD);
134 exception_name = split_verifier.result();
135 if (can_failover && !HAS_PENDING_EXCEPTION &&
136 (exception_name == vmSymbols::java_lang_VerifyError() ||
137 exception_name == vmSymbols::java_lang_ClassFormatError())) {
138 if (TraceClassInitialization || VerboseVerification) {
139 tty->print_cr(
140 "Fail over class verification to old verifier for: %s", klassName);
141 }
142 exception_name = inference_verify(
143 klass, message_buffer, message_buffer_len, THREAD);
144 }
145 if (exception_name != NULL) {
146 exception_message = split_verifier.exception_message();
147 }
148 } else {
149 exception_name = inference_verify(
150 klass, message_buffer, message_buffer_len, THREAD);
151 }
153 if (TraceClassInitialization || VerboseVerification) {
154 if (HAS_PENDING_EXCEPTION) {
155 tty->print("Verification for %s has", klassName);
156 tty->print_cr(" exception pending %s ",
157 InstanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
158 } else if (exception_name != NULL) {
159 tty->print_cr("Verification for %s failed", klassName);
160 }
161 tty->print_cr("End class verification for: %s", klassName);
162 }
163 }
165 if (HAS_PENDING_EXCEPTION) {
166 return false; // use the existing exception
167 } else if (exception_name == NULL) {
168 return true; // verifcation succeeded
169 } else { // VerifyError or ClassFormatError to be created and thrown
170 ResourceMark rm(THREAD);
171 instanceKlassHandle kls =
172 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
173 while (!kls.is_null()) {
174 if (kls == klass) {
175 // If the class being verified is the exception we're creating
176 // or one of it's superclasses, we're in trouble and are going
177 // to infinitely recurse when we try to initialize the exception.
178 // So bail out here by throwing the preallocated VM error.
179 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
180 }
181 kls = kls->super();
182 }
183 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
184 THROW_MSG_(exception_name, exception_message, false);
185 }
186 }
188 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
189 Symbol* name = klass->name();
190 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
192 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
194 return (should_verify_for(klass->class_loader(), should_verify_class) &&
195 // return if the class is a bootstrapping class
196 // or defineClass specified not to verify by default (flags override passed arg)
197 // We need to skip the following four for bootstraping
198 name != vmSymbols::java_lang_Object() &&
199 name != vmSymbols::java_lang_Class() &&
200 name != vmSymbols::java_lang_String() &&
201 name != vmSymbols::java_lang_Throwable() &&
203 // Can not verify the bytecodes for shared classes because they have
204 // already been rewritten to contain constant pool cache indices,
205 // which the verifier can't understand.
206 // Shared classes shouldn't have stackmaps either.
207 !klass()->is_shared() &&
209 // As of the fix for 4486457 we disable verification for all of the
210 // dynamically-generated bytecodes associated with the 1.4
211 // reflection implementation, not just those associated with
212 // sun/reflect/SerializationConstructorAccessor.
213 // NOTE: this is called too early in the bootstrapping process to be
214 // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.
215 // Also for lambda generated code, gte jdk8
216 (!is_reflect || VerifyReflectionBytecodes));
217 }
219 Symbol* Verifier::inference_verify(
220 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
221 JavaThread* thread = (JavaThread*)THREAD;
222 JNIEnv *env = thread->jni_environment();
224 void* verify_func = verify_byte_codes_fn();
226 if (verify_func == NULL) {
227 jio_snprintf(message, message_len, "Could not link verifier");
228 return vmSymbols::java_lang_VerifyError();
229 }
231 ResourceMark rm(THREAD);
232 if (VerboseVerification) {
233 tty->print_cr("Verifying class %s with old format", klass->external_name());
234 }
236 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
237 jint result;
239 {
240 HandleMark hm(thread);
241 ThreadToNativeFromVM ttn(thread);
242 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
243 // code knows that we have left the VM
245 if (_is_new_verify_byte_codes_fn) {
246 verify_byte_codes_fn_new_t func =
247 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
248 result = (*func)(env, cls, message, (int)message_len,
249 klass->major_version());
250 } else {
251 verify_byte_codes_fn_t func =
252 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
253 result = (*func)(env, cls, message, (int)message_len);
254 }
255 }
257 JNIHandles::destroy_local(cls);
259 // These numbers are chosen so that VerifyClassCodes interface doesn't need
260 // to be changed (still return jboolean (unsigned char)), and result is
261 // 1 when verification is passed.
262 if (result == 0) {
263 return vmSymbols::java_lang_VerifyError();
264 } else if (result == 1) {
265 return NULL; // verified.
266 } else if (result == 2) {
267 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
268 } else if (result == 3) {
269 return vmSymbols::java_lang_ClassFormatError();
270 } else {
271 ShouldNotReachHere();
272 return NULL;
273 }
274 }
276 TypeOrigin TypeOrigin::null() {
277 return TypeOrigin();
278 }
279 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
280 assert(frame != NULL, "Must have a frame");
281 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
282 frame->local_at(index));
283 }
284 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
285 assert(frame != NULL, "Must have a frame");
286 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
287 frame->stack_at(index));
288 }
289 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
290 assert(frame != NULL, "Must have a frame");
291 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
292 frame->local_at(index));
293 }
294 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
295 assert(frame != NULL, "Must have a frame");
296 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
297 frame->stack_at(index));
298 }
299 TypeOrigin TypeOrigin::bad_index(u2 index) {
300 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
301 }
302 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
303 return TypeOrigin(CONST_POOL, index, NULL, vt);
304 }
305 TypeOrigin TypeOrigin::signature(VerificationType vt) {
306 return TypeOrigin(SIG, 0, NULL, vt);
307 }
308 TypeOrigin TypeOrigin::implicit(VerificationType t) {
309 return TypeOrigin(IMPLICIT, 0, NULL, t);
310 }
311 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
312 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
313 VerificationType::bogus_type());
314 }
316 void TypeOrigin::reset_frame() {
317 if (_frame != NULL) {
318 _frame->restore();
319 }
320 }
322 void TypeOrigin::details(outputStream* ss) const {
323 _type.print_on(ss);
324 switch (_origin) {
325 case CF_LOCALS:
326 ss->print(" (current frame, locals[%d])", _index);
327 break;
328 case CF_STACK:
329 ss->print(" (current frame, stack[%d])", _index);
330 break;
331 case SM_LOCALS:
332 ss->print(" (stack map, locals[%d])", _index);
333 break;
334 case SM_STACK:
335 ss->print(" (stack map, stack[%d])", _index);
336 break;
337 case CONST_POOL:
338 ss->print(" (constant pool %d)", _index);
339 break;
340 case SIG:
341 ss->print(" (from method signature)");
342 break;
343 case IMPLICIT:
344 case FRAME_ONLY:
345 case NONE:
346 default:
347 ;
348 }
349 }
351 #ifdef ASSERT
352 void TypeOrigin::print_on(outputStream* str) const {
353 str->print("{%d,%d,%p:", _origin, _index, _frame);
354 if (_frame != NULL) {
355 _frame->print_on(str);
356 } else {
357 str->print("null");
358 }
359 str->print(",");
360 _type.print_on(str);
361 str->print("}");
362 }
363 #endif
365 void ErrorContext::details(outputStream* ss, const Method* method) const {
366 if (is_valid()) {
367 ss->cr();
368 ss->print_cr("Exception Details:");
369 location_details(ss, method);
370 reason_details(ss);
371 frame_details(ss);
372 bytecode_details(ss, method);
373 handler_details(ss, method);
374 stackmap_details(ss, method);
375 }
376 }
378 void ErrorContext::reason_details(outputStream* ss) const {
379 streamIndentor si(ss);
380 ss->indent().print_cr("Reason:");
381 streamIndentor si2(ss);
382 ss->indent().print("%s", "");
383 switch (_fault) {
384 case INVALID_BYTECODE:
385 ss->print("Error exists in the bytecode");
386 break;
387 case WRONG_TYPE:
388 if (_expected.is_valid()) {
389 ss->print("Type ");
390 _type.details(ss);
391 ss->print(" is not assignable to ");
392 _expected.details(ss);
393 } else {
394 ss->print("Invalid type: ");
395 _type.details(ss);
396 }
397 break;
398 case FLAGS_MISMATCH:
399 if (_expected.is_valid()) {
400 ss->print("Current frame's flags are not assignable "
401 "to stack map frame's.");
402 } else {
403 ss->print("Current frame's flags are invalid in this context.");
404 }
405 break;
406 case BAD_CP_INDEX:
407 ss->print("Constant pool index %d is invalid", _type.index());
408 break;
409 case BAD_LOCAL_INDEX:
410 ss->print("Local index %d is invalid", _type.index());
411 break;
412 case LOCALS_SIZE_MISMATCH:
413 ss->print("Current frame's local size doesn't match stackmap.");
414 break;
415 case STACK_SIZE_MISMATCH:
416 ss->print("Current frame's stack size doesn't match stackmap.");
417 break;
418 case STACK_OVERFLOW:
419 ss->print("Exceeded max stack size.");
420 break;
421 case STACK_UNDERFLOW:
422 ss->print("Attempt to pop empty stack.");
423 break;
424 case MISSING_STACKMAP:
425 ss->print("Expected stackmap frame at this location.");
426 break;
427 case BAD_STACKMAP:
428 ss->print("Invalid stackmap specification.");
429 break;
430 case UNKNOWN:
431 default:
432 ShouldNotReachHere();
433 ss->print_cr("Unknown");
434 }
435 ss->cr();
436 }
438 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
439 if (_bci != -1 && method != NULL) {
440 streamIndentor si(ss);
441 const char* bytecode_name = "<invalid>";
442 if (method->validate_bci_from_bcx(_bci) != -1) {
443 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
444 if (Bytecodes::is_defined(code)) {
445 bytecode_name = Bytecodes::name(code);
446 } else {
447 bytecode_name = "<illegal>";
448 }
449 }
450 InstanceKlass* ik = method->method_holder();
451 ss->indent().print_cr("Location:");
452 streamIndentor si2(ss);
453 ss->indent().print_cr("%s.%s%s @%d: %s",
454 ik->name()->as_C_string(), method->name()->as_C_string(),
455 method->signature()->as_C_string(), _bci, bytecode_name);
456 }
457 }
459 void ErrorContext::frame_details(outputStream* ss) const {
460 streamIndentor si(ss);
461 if (_type.is_valid() && _type.frame() != NULL) {
462 ss->indent().print_cr("Current Frame:");
463 streamIndentor si2(ss);
464 _type.frame()->print_on(ss);
465 }
466 if (_expected.is_valid() && _expected.frame() != NULL) {
467 ss->indent().print_cr("Stackmap Frame:");
468 streamIndentor si2(ss);
469 _expected.frame()->print_on(ss);
470 }
471 }
473 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
474 if (method != NULL) {
475 streamIndentor si(ss);
476 ss->indent().print_cr("Bytecode:");
477 streamIndentor si2(ss);
478 ss->print_data(method->code_base(), method->code_size(), false);
479 }
480 }
482 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
483 if (method != NULL) {
484 streamIndentor si(ss);
485 ExceptionTable table(method);
486 if (table.length() > 0) {
487 ss->indent().print_cr("Exception Handler Table:");
488 streamIndentor si2(ss);
489 for (int i = 0; i < table.length(); ++i) {
490 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
491 table.end_pc(i), table.handler_pc(i));
492 }
493 }
494 }
495 }
497 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
498 if (method != NULL && method->has_stackmap_table()) {
499 streamIndentor si(ss);
500 ss->indent().print_cr("Stackmap Table:");
501 Array<u1>* data = method->stackmap_data();
502 stack_map_table* sm_table =
503 stack_map_table::at((address)data->adr_at(0));
504 stack_map_frame* sm_frame = sm_table->entries();
505 streamIndentor si2(ss);
506 int current_offset = -1;
507 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
508 ss->indent();
509 sm_frame->print_on(ss, current_offset);
510 ss->cr();
511 current_offset += sm_frame->offset_delta();
512 sm_frame = sm_frame->next();
513 }
514 }
515 }
517 // Methods in ClassVerifier
519 ClassVerifier::ClassVerifier(
520 instanceKlassHandle klass, TRAPS)
521 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
522 _this_type = VerificationType::reference_type(klass->name());
523 // Create list to hold symbols in reference area.
524 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
525 }
527 ClassVerifier::~ClassVerifier() {
528 // Decrement the reference count for any symbols created.
529 for (int i = 0; i < _symbols->length(); i++) {
530 Symbol* s = _symbols->at(i);
531 s->decrement_refcount();
532 }
533 }
535 VerificationType ClassVerifier::object_type() const {
536 return VerificationType::reference_type(vmSymbols::java_lang_Object());
537 }
539 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) {
540 VerificationType vt = VerificationType::reference_type(
541 create_temporary_symbol(sig, (int)strlen(sig), THREAD));
542 return TypeOrigin::implicit(vt);
543 }
545 void ClassVerifier::verify_class(TRAPS) {
546 if (VerboseVerification) {
547 tty->print_cr("Verifying class %s with new format",
548 _klass->external_name());
549 }
551 Array<Method*>* methods = _klass->methods();
552 int num_methods = methods->length();
554 for (int index = 0; index < num_methods; index++) {
555 // Check for recursive re-verification before each method.
556 if (was_recursively_verified()) return;
558 Method* m = methods->at(index);
559 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
560 // If m is native or abstract, skip it. It is checked in class file
561 // parser that methods do not override a final method. Overpass methods
562 // are trusted since the VM generates them.
563 continue;
564 }
565 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
566 }
568 if (VerboseVerification || TraceClassInitialization) {
569 if (was_recursively_verified())
570 tty->print_cr("Recursive verification detected for: %s",
571 _klass->external_name());
572 }
573 }
575 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
576 HandleMark hm(THREAD);
577 _method = m; // initialize _method
578 if (VerboseVerification) {
579 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
580 }
582 // For clang, the only good constant format string is a literal constant format string.
583 #define bad_type_msg "Bad type on operand stack in %s"
585 int32_t max_stack = m->verifier_max_stack();
586 int32_t max_locals = m->max_locals();
587 constantPoolHandle cp(THREAD, m->constants());
589 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
590 class_format_error("Invalid method signature");
591 return;
592 }
594 // Initial stack map frame: offset is 0, stack is initially empty.
595 StackMapFrame current_frame(max_locals, max_stack, this);
596 // Set initial locals
597 VerificationType return_type = current_frame.set_locals_from_arg(
598 m, current_type(), CHECK_VERIFY(this));
600 int32_t stackmap_index = 0; // index to the stackmap array
602 u4 code_length = m->code_size();
604 // Scan the bytecode and map each instruction's start offset to a number.
605 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
607 int ex_min = code_length;
608 int ex_max = -1;
609 // Look through each item on the exception table. Each of the fields must refer
610 // to a legal instruction.
611 verify_exception_handler_table(
612 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
614 // Look through each entry on the local variable table and make sure
615 // its range of code array offsets is valid. (4169817)
616 if (m->has_localvariable_table()) {
617 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
618 }
620 Array<u1>* stackmap_data = m->stackmap_data();
621 StackMapStream stream(stackmap_data);
622 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
623 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
624 code_data, code_length, CHECK_VERIFY(this));
626 if (VerboseVerification) {
627 stackmap_table.print_on(tty);
628 }
630 RawBytecodeStream bcs(m);
632 // Scan the byte code linearly from the start to the end
633 bool no_control_flow = false; // Set to true when there is no direct control
634 // flow from current instruction to the next
635 // instruction in sequence
637 Bytecodes::Code opcode;
638 while (!bcs.is_last_bytecode()) {
639 // Check for recursive re-verification before each bytecode.
640 if (was_recursively_verified()) return;
642 opcode = bcs.raw_next();
643 u2 bci = bcs.bci();
645 // Set current frame's offset to bci
646 current_frame.set_offset(bci);
647 current_frame.set_mark();
649 // Make sure every offset in stackmap table point to the beginning to
650 // an instruction. Match current_frame to stackmap_table entry with
651 // the same offset if exists.
652 stackmap_index = verify_stackmap_table(
653 stackmap_index, bci, ¤t_frame, &stackmap_table,
654 no_control_flow, CHECK_VERIFY(this));
657 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
659 // Merge with the next instruction
660 {
661 u2 index;
662 int target;
663 VerificationType type, type2;
664 VerificationType atype;
666 #ifndef PRODUCT
667 if (VerboseVerification) {
668 current_frame.print_on(tty);
669 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
670 }
671 #endif
673 // Make sure wide instruction is in correct format
674 if (bcs.is_wide()) {
675 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
676 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
677 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
678 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
679 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
680 opcode != Bytecodes::_dstore) {
681 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
682 * if we encounter a wide instruction that modifies an invalid
683 * opcode (not one of the ones listed above) */
684 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
685 return;
686 }
687 }
689 switch (opcode) {
690 case Bytecodes::_nop :
691 no_control_flow = false; break;
692 case Bytecodes::_aconst_null :
693 current_frame.push_stack(
694 VerificationType::null_type(), CHECK_VERIFY(this));
695 no_control_flow = false; break;
696 case Bytecodes::_iconst_m1 :
697 case Bytecodes::_iconst_0 :
698 case Bytecodes::_iconst_1 :
699 case Bytecodes::_iconst_2 :
700 case Bytecodes::_iconst_3 :
701 case Bytecodes::_iconst_4 :
702 case Bytecodes::_iconst_5 :
703 current_frame.push_stack(
704 VerificationType::integer_type(), CHECK_VERIFY(this));
705 no_control_flow = false; break;
706 case Bytecodes::_lconst_0 :
707 case Bytecodes::_lconst_1 :
708 current_frame.push_stack_2(
709 VerificationType::long_type(),
710 VerificationType::long2_type(), CHECK_VERIFY(this));
711 no_control_flow = false; break;
712 case Bytecodes::_fconst_0 :
713 case Bytecodes::_fconst_1 :
714 case Bytecodes::_fconst_2 :
715 current_frame.push_stack(
716 VerificationType::float_type(), CHECK_VERIFY(this));
717 no_control_flow = false; break;
718 case Bytecodes::_dconst_0 :
719 case Bytecodes::_dconst_1 :
720 current_frame.push_stack_2(
721 VerificationType::double_type(),
722 VerificationType::double2_type(), CHECK_VERIFY(this));
723 no_control_flow = false; break;
724 case Bytecodes::_sipush :
725 case Bytecodes::_bipush :
726 current_frame.push_stack(
727 VerificationType::integer_type(), CHECK_VERIFY(this));
728 no_control_flow = false; break;
729 case Bytecodes::_ldc :
730 verify_ldc(
731 opcode, bcs.get_index_u1(), ¤t_frame,
732 cp, bci, CHECK_VERIFY(this));
733 no_control_flow = false; break;
734 case Bytecodes::_ldc_w :
735 case Bytecodes::_ldc2_w :
736 verify_ldc(
737 opcode, bcs.get_index_u2(), ¤t_frame,
738 cp, bci, CHECK_VERIFY(this));
739 no_control_flow = false; break;
740 case Bytecodes::_iload :
741 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
742 no_control_flow = false; break;
743 case Bytecodes::_iload_0 :
744 case Bytecodes::_iload_1 :
745 case Bytecodes::_iload_2 :
746 case Bytecodes::_iload_3 :
747 index = opcode - Bytecodes::_iload_0;
748 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
749 no_control_flow = false; break;
750 case Bytecodes::_lload :
751 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
752 no_control_flow = false; break;
753 case Bytecodes::_lload_0 :
754 case Bytecodes::_lload_1 :
755 case Bytecodes::_lload_2 :
756 case Bytecodes::_lload_3 :
757 index = opcode - Bytecodes::_lload_0;
758 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
759 no_control_flow = false; break;
760 case Bytecodes::_fload :
761 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
762 no_control_flow = false; break;
763 case Bytecodes::_fload_0 :
764 case Bytecodes::_fload_1 :
765 case Bytecodes::_fload_2 :
766 case Bytecodes::_fload_3 :
767 index = opcode - Bytecodes::_fload_0;
768 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
769 no_control_flow = false; break;
770 case Bytecodes::_dload :
771 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
772 no_control_flow = false; break;
773 case Bytecodes::_dload_0 :
774 case Bytecodes::_dload_1 :
775 case Bytecodes::_dload_2 :
776 case Bytecodes::_dload_3 :
777 index = opcode - Bytecodes::_dload_0;
778 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
779 no_control_flow = false; break;
780 case Bytecodes::_aload :
781 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
782 no_control_flow = false; break;
783 case Bytecodes::_aload_0 :
784 case Bytecodes::_aload_1 :
785 case Bytecodes::_aload_2 :
786 case Bytecodes::_aload_3 :
787 index = opcode - Bytecodes::_aload_0;
788 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
789 no_control_flow = false; break;
790 case Bytecodes::_iaload :
791 type = current_frame.pop_stack(
792 VerificationType::integer_type(), CHECK_VERIFY(this));
793 atype = current_frame.pop_stack(
794 VerificationType::reference_check(), CHECK_VERIFY(this));
795 if (!atype.is_int_array()) {
796 verify_error(ErrorContext::bad_type(bci,
797 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
798 bad_type_msg, "iaload");
799 return;
800 }
801 current_frame.push_stack(
802 VerificationType::integer_type(), CHECK_VERIFY(this));
803 no_control_flow = false; break;
804 case Bytecodes::_baload :
805 type = current_frame.pop_stack(
806 VerificationType::integer_type(), CHECK_VERIFY(this));
807 atype = current_frame.pop_stack(
808 VerificationType::reference_check(), CHECK_VERIFY(this));
809 if (!atype.is_bool_array() && !atype.is_byte_array()) {
810 verify_error(
811 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
812 bad_type_msg, "baload");
813 return;
814 }
815 current_frame.push_stack(
816 VerificationType::integer_type(), CHECK_VERIFY(this));
817 no_control_flow = false; break;
818 case Bytecodes::_caload :
819 type = current_frame.pop_stack(
820 VerificationType::integer_type(), CHECK_VERIFY(this));
821 atype = current_frame.pop_stack(
822 VerificationType::reference_check(), CHECK_VERIFY(this));
823 if (!atype.is_char_array()) {
824 verify_error(ErrorContext::bad_type(bci,
825 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
826 bad_type_msg, "caload");
827 return;
828 }
829 current_frame.push_stack(
830 VerificationType::integer_type(), CHECK_VERIFY(this));
831 no_control_flow = false; break;
832 case Bytecodes::_saload :
833 type = current_frame.pop_stack(
834 VerificationType::integer_type(), CHECK_VERIFY(this));
835 atype = current_frame.pop_stack(
836 VerificationType::reference_check(), CHECK_VERIFY(this));
837 if (!atype.is_short_array()) {
838 verify_error(ErrorContext::bad_type(bci,
839 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
840 bad_type_msg, "saload");
841 return;
842 }
843 current_frame.push_stack(
844 VerificationType::integer_type(), CHECK_VERIFY(this));
845 no_control_flow = false; break;
846 case Bytecodes::_laload :
847 type = current_frame.pop_stack(
848 VerificationType::integer_type(), CHECK_VERIFY(this));
849 atype = current_frame.pop_stack(
850 VerificationType::reference_check(), CHECK_VERIFY(this));
851 if (!atype.is_long_array()) {
852 verify_error(ErrorContext::bad_type(bci,
853 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
854 bad_type_msg, "laload");
855 return;
856 }
857 current_frame.push_stack_2(
858 VerificationType::long_type(),
859 VerificationType::long2_type(), CHECK_VERIFY(this));
860 no_control_flow = false; break;
861 case Bytecodes::_faload :
862 type = current_frame.pop_stack(
863 VerificationType::integer_type(), CHECK_VERIFY(this));
864 atype = current_frame.pop_stack(
865 VerificationType::reference_check(), CHECK_VERIFY(this));
866 if (!atype.is_float_array()) {
867 verify_error(ErrorContext::bad_type(bci,
868 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
869 bad_type_msg, "faload");
870 return;
871 }
872 current_frame.push_stack(
873 VerificationType::float_type(), CHECK_VERIFY(this));
874 no_control_flow = false; break;
875 case Bytecodes::_daload :
876 type = current_frame.pop_stack(
877 VerificationType::integer_type(), CHECK_VERIFY(this));
878 atype = current_frame.pop_stack(
879 VerificationType::reference_check(), CHECK_VERIFY(this));
880 if (!atype.is_double_array()) {
881 verify_error(ErrorContext::bad_type(bci,
882 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
883 bad_type_msg, "daload");
884 return;
885 }
886 current_frame.push_stack_2(
887 VerificationType::double_type(),
888 VerificationType::double2_type(), CHECK_VERIFY(this));
889 no_control_flow = false; break;
890 case Bytecodes::_aaload : {
891 type = current_frame.pop_stack(
892 VerificationType::integer_type(), CHECK_VERIFY(this));
893 atype = current_frame.pop_stack(
894 VerificationType::reference_check(), CHECK_VERIFY(this));
895 if (!atype.is_reference_array()) {
896 verify_error(ErrorContext::bad_type(bci,
897 current_frame.stack_top_ctx(),
898 TypeOrigin::implicit(VerificationType::reference_check())),
899 bad_type_msg, "aaload");
900 return;
901 }
902 if (atype.is_null()) {
903 current_frame.push_stack(
904 VerificationType::null_type(), CHECK_VERIFY(this));
905 } else {
906 VerificationType component =
907 atype.get_component(this, CHECK_VERIFY(this));
908 current_frame.push_stack(component, CHECK_VERIFY(this));
909 }
910 no_control_flow = false; break;
911 }
912 case Bytecodes::_istore :
913 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
914 no_control_flow = false; break;
915 case Bytecodes::_istore_0 :
916 case Bytecodes::_istore_1 :
917 case Bytecodes::_istore_2 :
918 case Bytecodes::_istore_3 :
919 index = opcode - Bytecodes::_istore_0;
920 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
921 no_control_flow = false; break;
922 case Bytecodes::_lstore :
923 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
924 no_control_flow = false; break;
925 case Bytecodes::_lstore_0 :
926 case Bytecodes::_lstore_1 :
927 case Bytecodes::_lstore_2 :
928 case Bytecodes::_lstore_3 :
929 index = opcode - Bytecodes::_lstore_0;
930 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
931 no_control_flow = false; break;
932 case Bytecodes::_fstore :
933 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
934 no_control_flow = false; break;
935 case Bytecodes::_fstore_0 :
936 case Bytecodes::_fstore_1 :
937 case Bytecodes::_fstore_2 :
938 case Bytecodes::_fstore_3 :
939 index = opcode - Bytecodes::_fstore_0;
940 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
941 no_control_flow = false; break;
942 case Bytecodes::_dstore :
943 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
944 no_control_flow = false; break;
945 case Bytecodes::_dstore_0 :
946 case Bytecodes::_dstore_1 :
947 case Bytecodes::_dstore_2 :
948 case Bytecodes::_dstore_3 :
949 index = opcode - Bytecodes::_dstore_0;
950 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
951 no_control_flow = false; break;
952 case Bytecodes::_astore :
953 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
954 no_control_flow = false; break;
955 case Bytecodes::_astore_0 :
956 case Bytecodes::_astore_1 :
957 case Bytecodes::_astore_2 :
958 case Bytecodes::_astore_3 :
959 index = opcode - Bytecodes::_astore_0;
960 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
961 no_control_flow = false; break;
962 case Bytecodes::_iastore :
963 type = current_frame.pop_stack(
964 VerificationType::integer_type(), CHECK_VERIFY(this));
965 type2 = current_frame.pop_stack(
966 VerificationType::integer_type(), CHECK_VERIFY(this));
967 atype = current_frame.pop_stack(
968 VerificationType::reference_check(), CHECK_VERIFY(this));
969 if (!atype.is_int_array()) {
970 verify_error(ErrorContext::bad_type(bci,
971 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
972 bad_type_msg, "iastore");
973 return;
974 }
975 no_control_flow = false; break;
976 case Bytecodes::_bastore :
977 type = current_frame.pop_stack(
978 VerificationType::integer_type(), CHECK_VERIFY(this));
979 type2 = current_frame.pop_stack(
980 VerificationType::integer_type(), CHECK_VERIFY(this));
981 atype = current_frame.pop_stack(
982 VerificationType::reference_check(), CHECK_VERIFY(this));
983 if (!atype.is_bool_array() && !atype.is_byte_array()) {
984 verify_error(
985 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
986 bad_type_msg, "bastore");
987 return;
988 }
989 no_control_flow = false; break;
990 case Bytecodes::_castore :
991 current_frame.pop_stack(
992 VerificationType::integer_type(), CHECK_VERIFY(this));
993 current_frame.pop_stack(
994 VerificationType::integer_type(), CHECK_VERIFY(this));
995 atype = current_frame.pop_stack(
996 VerificationType::reference_check(), CHECK_VERIFY(this));
997 if (!atype.is_char_array()) {
998 verify_error(ErrorContext::bad_type(bci,
999 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
1000 bad_type_msg, "castore");
1001 return;
1002 }
1003 no_control_flow = false; break;
1004 case Bytecodes::_sastore :
1005 current_frame.pop_stack(
1006 VerificationType::integer_type(), CHECK_VERIFY(this));
1007 current_frame.pop_stack(
1008 VerificationType::integer_type(), CHECK_VERIFY(this));
1009 atype = current_frame.pop_stack(
1010 VerificationType::reference_check(), CHECK_VERIFY(this));
1011 if (!atype.is_short_array()) {
1012 verify_error(ErrorContext::bad_type(bci,
1013 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1014 bad_type_msg, "sastore");
1015 return;
1016 }
1017 no_control_flow = false; break;
1018 case Bytecodes::_lastore :
1019 current_frame.pop_stack_2(
1020 VerificationType::long2_type(),
1021 VerificationType::long_type(), CHECK_VERIFY(this));
1022 current_frame.pop_stack(
1023 VerificationType::integer_type(), CHECK_VERIFY(this));
1024 atype = current_frame.pop_stack(
1025 VerificationType::reference_check(), CHECK_VERIFY(this));
1026 if (!atype.is_long_array()) {
1027 verify_error(ErrorContext::bad_type(bci,
1028 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1029 bad_type_msg, "lastore");
1030 return;
1031 }
1032 no_control_flow = false; break;
1033 case Bytecodes::_fastore :
1034 current_frame.pop_stack(
1035 VerificationType::float_type(), CHECK_VERIFY(this));
1036 current_frame.pop_stack
1037 (VerificationType::integer_type(), CHECK_VERIFY(this));
1038 atype = current_frame.pop_stack(
1039 VerificationType::reference_check(), CHECK_VERIFY(this));
1040 if (!atype.is_float_array()) {
1041 verify_error(ErrorContext::bad_type(bci,
1042 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1043 bad_type_msg, "fastore");
1044 return;
1045 }
1046 no_control_flow = false; break;
1047 case Bytecodes::_dastore :
1048 current_frame.pop_stack_2(
1049 VerificationType::double2_type(),
1050 VerificationType::double_type(), CHECK_VERIFY(this));
1051 current_frame.pop_stack(
1052 VerificationType::integer_type(), CHECK_VERIFY(this));
1053 atype = current_frame.pop_stack(
1054 VerificationType::reference_check(), CHECK_VERIFY(this));
1055 if (!atype.is_double_array()) {
1056 verify_error(ErrorContext::bad_type(bci,
1057 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1058 bad_type_msg, "dastore");
1059 return;
1060 }
1061 no_control_flow = false; break;
1062 case Bytecodes::_aastore :
1063 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1064 type2 = current_frame.pop_stack(
1065 VerificationType::integer_type(), CHECK_VERIFY(this));
1066 atype = current_frame.pop_stack(
1067 VerificationType::reference_check(), CHECK_VERIFY(this));
1068 // more type-checking is done at runtime
1069 if (!atype.is_reference_array()) {
1070 verify_error(ErrorContext::bad_type(bci,
1071 current_frame.stack_top_ctx(),
1072 TypeOrigin::implicit(VerificationType::reference_check())),
1073 bad_type_msg, "aastore");
1074 return;
1075 }
1076 // 4938384: relaxed constraint in JVMS 3nd edition.
1077 no_control_flow = false; break;
1078 case Bytecodes::_pop :
1079 current_frame.pop_stack(
1080 VerificationType::category1_check(), CHECK_VERIFY(this));
1081 no_control_flow = false; break;
1082 case Bytecodes::_pop2 :
1083 type = current_frame.pop_stack(CHECK_VERIFY(this));
1084 if (type.is_category1()) {
1085 current_frame.pop_stack(
1086 VerificationType::category1_check(), CHECK_VERIFY(this));
1087 } else if (type.is_category2_2nd()) {
1088 current_frame.pop_stack(
1089 VerificationType::category2_check(), CHECK_VERIFY(this));
1090 } else {
1091 /* Unreachable? Would need a category2_1st on TOS
1092 * which does not appear possible. */
1093 verify_error(
1094 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1095 bad_type_msg, "pop2");
1096 return;
1097 }
1098 no_control_flow = false; break;
1099 case Bytecodes::_dup :
1100 type = current_frame.pop_stack(
1101 VerificationType::category1_check(), CHECK_VERIFY(this));
1102 current_frame.push_stack(type, CHECK_VERIFY(this));
1103 current_frame.push_stack(type, CHECK_VERIFY(this));
1104 no_control_flow = false; break;
1105 case Bytecodes::_dup_x1 :
1106 type = current_frame.pop_stack(
1107 VerificationType::category1_check(), CHECK_VERIFY(this));
1108 type2 = current_frame.pop_stack(
1109 VerificationType::category1_check(), CHECK_VERIFY(this));
1110 current_frame.push_stack(type, CHECK_VERIFY(this));
1111 current_frame.push_stack(type2, CHECK_VERIFY(this));
1112 current_frame.push_stack(type, CHECK_VERIFY(this));
1113 no_control_flow = false; break;
1114 case Bytecodes::_dup_x2 :
1115 {
1116 VerificationType type3;
1117 type = current_frame.pop_stack(
1118 VerificationType::category1_check(), CHECK_VERIFY(this));
1119 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1120 if (type2.is_category1()) {
1121 type3 = current_frame.pop_stack(
1122 VerificationType::category1_check(), CHECK_VERIFY(this));
1123 } else if (type2.is_category2_2nd()) {
1124 type3 = current_frame.pop_stack(
1125 VerificationType::category2_check(), CHECK_VERIFY(this));
1126 } else {
1127 /* Unreachable? Would need a category2_1st at stack depth 2 with
1128 * a category1 on TOS which does not appear possible. */
1129 verify_error(ErrorContext::bad_type(
1130 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1131 return;
1132 }
1133 current_frame.push_stack(type, CHECK_VERIFY(this));
1134 current_frame.push_stack(type3, CHECK_VERIFY(this));
1135 current_frame.push_stack(type2, CHECK_VERIFY(this));
1136 current_frame.push_stack(type, CHECK_VERIFY(this));
1137 no_control_flow = false; break;
1138 }
1139 case Bytecodes::_dup2 :
1140 type = current_frame.pop_stack(CHECK_VERIFY(this));
1141 if (type.is_category1()) {
1142 type2 = current_frame.pop_stack(
1143 VerificationType::category1_check(), CHECK_VERIFY(this));
1144 } else if (type.is_category2_2nd()) {
1145 type2 = current_frame.pop_stack(
1146 VerificationType::category2_check(), CHECK_VERIFY(this));
1147 } else {
1148 /* Unreachable? Would need a category2_1st on TOS which does not
1149 * appear possible. */
1150 verify_error(
1151 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1152 bad_type_msg, "dup2");
1153 return;
1154 }
1155 current_frame.push_stack(type2, CHECK_VERIFY(this));
1156 current_frame.push_stack(type, CHECK_VERIFY(this));
1157 current_frame.push_stack(type2, CHECK_VERIFY(this));
1158 current_frame.push_stack(type, CHECK_VERIFY(this));
1159 no_control_flow = false; break;
1160 case Bytecodes::_dup2_x1 :
1161 {
1162 VerificationType type3;
1163 type = current_frame.pop_stack(CHECK_VERIFY(this));
1164 if (type.is_category1()) {
1165 type2 = current_frame.pop_stack(
1166 VerificationType::category1_check(), CHECK_VERIFY(this));
1167 } else if (type.is_category2_2nd()) {
1168 type2 = current_frame.pop_stack(
1169 VerificationType::category2_check(), CHECK_VERIFY(this));
1170 } else {
1171 /* Unreachable? Would need a category2_1st on TOS which does
1172 * not appear possible. */
1173 verify_error(
1174 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1175 bad_type_msg, "dup2_x1");
1176 return;
1177 }
1178 type3 = current_frame.pop_stack(
1179 VerificationType::category1_check(), CHECK_VERIFY(this));
1180 current_frame.push_stack(type2, CHECK_VERIFY(this));
1181 current_frame.push_stack(type, CHECK_VERIFY(this));
1182 current_frame.push_stack(type3, CHECK_VERIFY(this));
1183 current_frame.push_stack(type2, CHECK_VERIFY(this));
1184 current_frame.push_stack(type, CHECK_VERIFY(this));
1185 no_control_flow = false; break;
1186 }
1187 case Bytecodes::_dup2_x2 :
1188 {
1189 VerificationType type3, type4;
1190 type = current_frame.pop_stack(CHECK_VERIFY(this));
1191 if (type.is_category1()) {
1192 type2 = current_frame.pop_stack(
1193 VerificationType::category1_check(), CHECK_VERIFY(this));
1194 } else if (type.is_category2_2nd()) {
1195 type2 = current_frame.pop_stack(
1196 VerificationType::category2_check(), CHECK_VERIFY(this));
1197 } else {
1198 /* Unreachable? Would need a category2_1st on TOS which does
1199 * not appear possible. */
1200 verify_error(
1201 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1202 bad_type_msg, "dup2_x2");
1203 return;
1204 }
1205 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1206 if (type3.is_category1()) {
1207 type4 = current_frame.pop_stack(
1208 VerificationType::category1_check(), CHECK_VERIFY(this));
1209 } else if (type3.is_category2_2nd()) {
1210 type4 = current_frame.pop_stack(
1211 VerificationType::category2_check(), CHECK_VERIFY(this));
1212 } else {
1213 /* Unreachable? Would need a category2_1st on TOS after popping
1214 * a long/double or two category 1's, which does not
1215 * appear possible. */
1216 verify_error(
1217 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1218 bad_type_msg, "dup2_x2");
1219 return;
1220 }
1221 current_frame.push_stack(type2, CHECK_VERIFY(this));
1222 current_frame.push_stack(type, CHECK_VERIFY(this));
1223 current_frame.push_stack(type4, CHECK_VERIFY(this));
1224 current_frame.push_stack(type3, CHECK_VERIFY(this));
1225 current_frame.push_stack(type2, CHECK_VERIFY(this));
1226 current_frame.push_stack(type, CHECK_VERIFY(this));
1227 no_control_flow = false; break;
1228 }
1229 case Bytecodes::_swap :
1230 type = current_frame.pop_stack(
1231 VerificationType::category1_check(), CHECK_VERIFY(this));
1232 type2 = current_frame.pop_stack(
1233 VerificationType::category1_check(), CHECK_VERIFY(this));
1234 current_frame.push_stack(type, CHECK_VERIFY(this));
1235 current_frame.push_stack(type2, CHECK_VERIFY(this));
1236 no_control_flow = false; break;
1237 case Bytecodes::_iadd :
1238 case Bytecodes::_isub :
1239 case Bytecodes::_imul :
1240 case Bytecodes::_idiv :
1241 case Bytecodes::_irem :
1242 case Bytecodes::_ishl :
1243 case Bytecodes::_ishr :
1244 case Bytecodes::_iushr :
1245 case Bytecodes::_ior :
1246 case Bytecodes::_ixor :
1247 case Bytecodes::_iand :
1248 current_frame.pop_stack(
1249 VerificationType::integer_type(), CHECK_VERIFY(this));
1250 // fall through
1251 case Bytecodes::_ineg :
1252 current_frame.pop_stack(
1253 VerificationType::integer_type(), CHECK_VERIFY(this));
1254 current_frame.push_stack(
1255 VerificationType::integer_type(), CHECK_VERIFY(this));
1256 no_control_flow = false; break;
1257 case Bytecodes::_ladd :
1258 case Bytecodes::_lsub :
1259 case Bytecodes::_lmul :
1260 case Bytecodes::_ldiv :
1261 case Bytecodes::_lrem :
1262 case Bytecodes::_land :
1263 case Bytecodes::_lor :
1264 case Bytecodes::_lxor :
1265 current_frame.pop_stack_2(
1266 VerificationType::long2_type(),
1267 VerificationType::long_type(), CHECK_VERIFY(this));
1268 // fall through
1269 case Bytecodes::_lneg :
1270 current_frame.pop_stack_2(
1271 VerificationType::long2_type(),
1272 VerificationType::long_type(), CHECK_VERIFY(this));
1273 current_frame.push_stack_2(
1274 VerificationType::long_type(),
1275 VerificationType::long2_type(), CHECK_VERIFY(this));
1276 no_control_flow = false; break;
1277 case Bytecodes::_lshl :
1278 case Bytecodes::_lshr :
1279 case Bytecodes::_lushr :
1280 current_frame.pop_stack(
1281 VerificationType::integer_type(), CHECK_VERIFY(this));
1282 current_frame.pop_stack_2(
1283 VerificationType::long2_type(),
1284 VerificationType::long_type(), CHECK_VERIFY(this));
1285 current_frame.push_stack_2(
1286 VerificationType::long_type(),
1287 VerificationType::long2_type(), CHECK_VERIFY(this));
1288 no_control_flow = false; break;
1289 case Bytecodes::_fadd :
1290 case Bytecodes::_fsub :
1291 case Bytecodes::_fmul :
1292 case Bytecodes::_fdiv :
1293 case Bytecodes::_frem :
1294 current_frame.pop_stack(
1295 VerificationType::float_type(), CHECK_VERIFY(this));
1296 // fall through
1297 case Bytecodes::_fneg :
1298 current_frame.pop_stack(
1299 VerificationType::float_type(), CHECK_VERIFY(this));
1300 current_frame.push_stack(
1301 VerificationType::float_type(), CHECK_VERIFY(this));
1302 no_control_flow = false; break;
1303 case Bytecodes::_dadd :
1304 case Bytecodes::_dsub :
1305 case Bytecodes::_dmul :
1306 case Bytecodes::_ddiv :
1307 case Bytecodes::_drem :
1308 current_frame.pop_stack_2(
1309 VerificationType::double2_type(),
1310 VerificationType::double_type(), CHECK_VERIFY(this));
1311 // fall through
1312 case Bytecodes::_dneg :
1313 current_frame.pop_stack_2(
1314 VerificationType::double2_type(),
1315 VerificationType::double_type(), CHECK_VERIFY(this));
1316 current_frame.push_stack_2(
1317 VerificationType::double_type(),
1318 VerificationType::double2_type(), CHECK_VERIFY(this));
1319 no_control_flow = false; break;
1320 case Bytecodes::_iinc :
1321 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1322 no_control_flow = false; break;
1323 case Bytecodes::_i2l :
1324 type = current_frame.pop_stack(
1325 VerificationType::integer_type(), CHECK_VERIFY(this));
1326 current_frame.push_stack_2(
1327 VerificationType::long_type(),
1328 VerificationType::long2_type(), CHECK_VERIFY(this));
1329 no_control_flow = false; break;
1330 case Bytecodes::_l2i :
1331 current_frame.pop_stack_2(
1332 VerificationType::long2_type(),
1333 VerificationType::long_type(), CHECK_VERIFY(this));
1334 current_frame.push_stack(
1335 VerificationType::integer_type(), CHECK_VERIFY(this));
1336 no_control_flow = false; break;
1337 case Bytecodes::_i2f :
1338 current_frame.pop_stack(
1339 VerificationType::integer_type(), CHECK_VERIFY(this));
1340 current_frame.push_stack(
1341 VerificationType::float_type(), CHECK_VERIFY(this));
1342 no_control_flow = false; break;
1343 case Bytecodes::_i2d :
1344 current_frame.pop_stack(
1345 VerificationType::integer_type(), CHECK_VERIFY(this));
1346 current_frame.push_stack_2(
1347 VerificationType::double_type(),
1348 VerificationType::double2_type(), CHECK_VERIFY(this));
1349 no_control_flow = false; break;
1350 case Bytecodes::_l2f :
1351 current_frame.pop_stack_2(
1352 VerificationType::long2_type(),
1353 VerificationType::long_type(), CHECK_VERIFY(this));
1354 current_frame.push_stack(
1355 VerificationType::float_type(), CHECK_VERIFY(this));
1356 no_control_flow = false; break;
1357 case Bytecodes::_l2d :
1358 current_frame.pop_stack_2(
1359 VerificationType::long2_type(),
1360 VerificationType::long_type(), CHECK_VERIFY(this));
1361 current_frame.push_stack_2(
1362 VerificationType::double_type(),
1363 VerificationType::double2_type(), CHECK_VERIFY(this));
1364 no_control_flow = false; break;
1365 case Bytecodes::_f2i :
1366 current_frame.pop_stack(
1367 VerificationType::float_type(), CHECK_VERIFY(this));
1368 current_frame.push_stack(
1369 VerificationType::integer_type(), CHECK_VERIFY(this));
1370 no_control_flow = false; break;
1371 case Bytecodes::_f2l :
1372 current_frame.pop_stack(
1373 VerificationType::float_type(), CHECK_VERIFY(this));
1374 current_frame.push_stack_2(
1375 VerificationType::long_type(),
1376 VerificationType::long2_type(), CHECK_VERIFY(this));
1377 no_control_flow = false; break;
1378 case Bytecodes::_f2d :
1379 current_frame.pop_stack(
1380 VerificationType::float_type(), CHECK_VERIFY(this));
1381 current_frame.push_stack_2(
1382 VerificationType::double_type(),
1383 VerificationType::double2_type(), CHECK_VERIFY(this));
1384 no_control_flow = false; break;
1385 case Bytecodes::_d2i :
1386 current_frame.pop_stack_2(
1387 VerificationType::double2_type(),
1388 VerificationType::double_type(), CHECK_VERIFY(this));
1389 current_frame.push_stack(
1390 VerificationType::integer_type(), CHECK_VERIFY(this));
1391 no_control_flow = false; break;
1392 case Bytecodes::_d2l :
1393 current_frame.pop_stack_2(
1394 VerificationType::double2_type(),
1395 VerificationType::double_type(), CHECK_VERIFY(this));
1396 current_frame.push_stack_2(
1397 VerificationType::long_type(),
1398 VerificationType::long2_type(), CHECK_VERIFY(this));
1399 no_control_flow = false; break;
1400 case Bytecodes::_d2f :
1401 current_frame.pop_stack_2(
1402 VerificationType::double2_type(),
1403 VerificationType::double_type(), CHECK_VERIFY(this));
1404 current_frame.push_stack(
1405 VerificationType::float_type(), CHECK_VERIFY(this));
1406 no_control_flow = false; break;
1407 case Bytecodes::_i2b :
1408 case Bytecodes::_i2c :
1409 case Bytecodes::_i2s :
1410 current_frame.pop_stack(
1411 VerificationType::integer_type(), CHECK_VERIFY(this));
1412 current_frame.push_stack(
1413 VerificationType::integer_type(), CHECK_VERIFY(this));
1414 no_control_flow = false; break;
1415 case Bytecodes::_lcmp :
1416 current_frame.pop_stack_2(
1417 VerificationType::long2_type(),
1418 VerificationType::long_type(), CHECK_VERIFY(this));
1419 current_frame.pop_stack_2(
1420 VerificationType::long2_type(),
1421 VerificationType::long_type(), CHECK_VERIFY(this));
1422 current_frame.push_stack(
1423 VerificationType::integer_type(), CHECK_VERIFY(this));
1424 no_control_flow = false; break;
1425 case Bytecodes::_fcmpl :
1426 case Bytecodes::_fcmpg :
1427 current_frame.pop_stack(
1428 VerificationType::float_type(), CHECK_VERIFY(this));
1429 current_frame.pop_stack(
1430 VerificationType::float_type(), CHECK_VERIFY(this));
1431 current_frame.push_stack(
1432 VerificationType::integer_type(), CHECK_VERIFY(this));
1433 no_control_flow = false; break;
1434 case Bytecodes::_dcmpl :
1435 case Bytecodes::_dcmpg :
1436 current_frame.pop_stack_2(
1437 VerificationType::double2_type(),
1438 VerificationType::double_type(), CHECK_VERIFY(this));
1439 current_frame.pop_stack_2(
1440 VerificationType::double2_type(),
1441 VerificationType::double_type(), CHECK_VERIFY(this));
1442 current_frame.push_stack(
1443 VerificationType::integer_type(), CHECK_VERIFY(this));
1444 no_control_flow = false; break;
1445 case Bytecodes::_if_icmpeq:
1446 case Bytecodes::_if_icmpne:
1447 case Bytecodes::_if_icmplt:
1448 case Bytecodes::_if_icmpge:
1449 case Bytecodes::_if_icmpgt:
1450 case Bytecodes::_if_icmple:
1451 current_frame.pop_stack(
1452 VerificationType::integer_type(), CHECK_VERIFY(this));
1453 // fall through
1454 case Bytecodes::_ifeq:
1455 case Bytecodes::_ifne:
1456 case Bytecodes::_iflt:
1457 case Bytecodes::_ifge:
1458 case Bytecodes::_ifgt:
1459 case Bytecodes::_ifle:
1460 current_frame.pop_stack(
1461 VerificationType::integer_type(), CHECK_VERIFY(this));
1462 target = bcs.dest();
1463 stackmap_table.check_jump_target(
1464 ¤t_frame, target, CHECK_VERIFY(this));
1465 no_control_flow = false; break;
1466 case Bytecodes::_if_acmpeq :
1467 case Bytecodes::_if_acmpne :
1468 current_frame.pop_stack(
1469 VerificationType::reference_check(), CHECK_VERIFY(this));
1470 // fall through
1471 case Bytecodes::_ifnull :
1472 case Bytecodes::_ifnonnull :
1473 current_frame.pop_stack(
1474 VerificationType::reference_check(), CHECK_VERIFY(this));
1475 target = bcs.dest();
1476 stackmap_table.check_jump_target
1477 (¤t_frame, target, CHECK_VERIFY(this));
1478 no_control_flow = false; break;
1479 case Bytecodes::_goto :
1480 target = bcs.dest();
1481 stackmap_table.check_jump_target(
1482 ¤t_frame, target, CHECK_VERIFY(this));
1483 no_control_flow = true; break;
1484 case Bytecodes::_goto_w :
1485 target = bcs.dest_w();
1486 stackmap_table.check_jump_target(
1487 ¤t_frame, target, CHECK_VERIFY(this));
1488 no_control_flow = true; break;
1489 case Bytecodes::_tableswitch :
1490 case Bytecodes::_lookupswitch :
1491 verify_switch(
1492 &bcs, code_length, code_data, ¤t_frame,
1493 &stackmap_table, CHECK_VERIFY(this));
1494 no_control_flow = true; break;
1495 case Bytecodes::_ireturn :
1496 type = current_frame.pop_stack(
1497 VerificationType::integer_type(), CHECK_VERIFY(this));
1498 verify_return_value(return_type, type, bci,
1499 ¤t_frame, CHECK_VERIFY(this));
1500 no_control_flow = true; break;
1501 case Bytecodes::_lreturn :
1502 type2 = current_frame.pop_stack(
1503 VerificationType::long2_type(), CHECK_VERIFY(this));
1504 type = current_frame.pop_stack(
1505 VerificationType::long_type(), CHECK_VERIFY(this));
1506 verify_return_value(return_type, type, bci,
1507 ¤t_frame, CHECK_VERIFY(this));
1508 no_control_flow = true; break;
1509 case Bytecodes::_freturn :
1510 type = current_frame.pop_stack(
1511 VerificationType::float_type(), CHECK_VERIFY(this));
1512 verify_return_value(return_type, type, bci,
1513 ¤t_frame, CHECK_VERIFY(this));
1514 no_control_flow = true; break;
1515 case Bytecodes::_dreturn :
1516 type2 = current_frame.pop_stack(
1517 VerificationType::double2_type(), CHECK_VERIFY(this));
1518 type = current_frame.pop_stack(
1519 VerificationType::double_type(), CHECK_VERIFY(this));
1520 verify_return_value(return_type, type, bci,
1521 ¤t_frame, CHECK_VERIFY(this));
1522 no_control_flow = true; break;
1523 case Bytecodes::_areturn :
1524 type = current_frame.pop_stack(
1525 VerificationType::reference_check(), CHECK_VERIFY(this));
1526 verify_return_value(return_type, type, bci,
1527 ¤t_frame, CHECK_VERIFY(this));
1528 no_control_flow = true; break;
1529 case Bytecodes::_return :
1530 if (return_type != VerificationType::bogus_type()) {
1531 verify_error(ErrorContext::bad_code(bci),
1532 "Method expects a return value");
1533 return;
1534 }
1535 // Make sure "this" has been initialized if current method is an
1536 // <init>
1537 if (_method->name() == vmSymbols::object_initializer_name() &&
1538 current_frame.flag_this_uninit()) {
1539 verify_error(ErrorContext::bad_code(bci),
1540 "Constructor must call super() or this() "
1541 "before return");
1542 return;
1543 }
1544 no_control_flow = true; break;
1545 case Bytecodes::_getstatic :
1546 case Bytecodes::_putstatic :
1547 case Bytecodes::_getfield :
1548 case Bytecodes::_putfield :
1549 verify_field_instructions(
1550 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1551 no_control_flow = false; break;
1552 case Bytecodes::_invokevirtual :
1553 case Bytecodes::_invokespecial :
1554 case Bytecodes::_invokestatic :
1555 verify_invoke_instructions(
1556 &bcs, code_length, ¤t_frame,
1557 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1558 no_control_flow = false; break;
1559 case Bytecodes::_invokeinterface :
1560 case Bytecodes::_invokedynamic :
1561 verify_invoke_instructions(
1562 &bcs, code_length, ¤t_frame,
1563 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1564 no_control_flow = false; break;
1565 case Bytecodes::_new :
1566 {
1567 index = bcs.get_index_u2();
1568 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1569 VerificationType new_class_type =
1570 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1571 if (!new_class_type.is_object()) {
1572 verify_error(ErrorContext::bad_type(bci,
1573 TypeOrigin::cp(index, new_class_type)),
1574 "Illegal new instruction");
1575 return;
1576 }
1577 type = VerificationType::uninitialized_type(bci);
1578 current_frame.push_stack(type, CHECK_VERIFY(this));
1579 no_control_flow = false; break;
1580 }
1581 case Bytecodes::_newarray :
1582 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1583 current_frame.pop_stack(
1584 VerificationType::integer_type(), CHECK_VERIFY(this));
1585 current_frame.push_stack(type, CHECK_VERIFY(this));
1586 no_control_flow = false; break;
1587 case Bytecodes::_anewarray :
1588 verify_anewarray(
1589 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1590 no_control_flow = false; break;
1591 case Bytecodes::_arraylength :
1592 type = current_frame.pop_stack(
1593 VerificationType::reference_check(), CHECK_VERIFY(this));
1594 if (!(type.is_null() || type.is_array())) {
1595 verify_error(ErrorContext::bad_type(
1596 bci, current_frame.stack_top_ctx()),
1597 bad_type_msg, "arraylength");
1598 }
1599 current_frame.push_stack(
1600 VerificationType::integer_type(), CHECK_VERIFY(this));
1601 no_control_flow = false; break;
1602 case Bytecodes::_checkcast :
1603 {
1604 index = bcs.get_index_u2();
1605 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1606 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1607 VerificationType klass_type = cp_index_to_type(
1608 index, cp, CHECK_VERIFY(this));
1609 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1610 no_control_flow = false; break;
1611 }
1612 case Bytecodes::_instanceof : {
1613 index = bcs.get_index_u2();
1614 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1615 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1616 current_frame.push_stack(
1617 VerificationType::integer_type(), CHECK_VERIFY(this));
1618 no_control_flow = false; break;
1619 }
1620 case Bytecodes::_monitorenter :
1621 case Bytecodes::_monitorexit :
1622 current_frame.pop_stack(
1623 VerificationType::reference_check(), CHECK_VERIFY(this));
1624 no_control_flow = false; break;
1625 case Bytecodes::_multianewarray :
1626 {
1627 index = bcs.get_index_u2();
1628 u2 dim = *(bcs.bcp()+3);
1629 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1630 VerificationType new_array_type =
1631 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1632 if (!new_array_type.is_array()) {
1633 verify_error(ErrorContext::bad_type(bci,
1634 TypeOrigin::cp(index, new_array_type)),
1635 "Illegal constant pool index in multianewarray instruction");
1636 return;
1637 }
1638 if (dim < 1 || new_array_type.dimensions() < dim) {
1639 verify_error(ErrorContext::bad_code(bci),
1640 "Illegal dimension in multianewarray instruction: %d", dim);
1641 return;
1642 }
1643 for (int i = 0; i < dim; i++) {
1644 current_frame.pop_stack(
1645 VerificationType::integer_type(), CHECK_VERIFY(this));
1646 }
1647 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1648 no_control_flow = false; break;
1649 }
1650 case Bytecodes::_athrow :
1651 type = VerificationType::reference_type(
1652 vmSymbols::java_lang_Throwable());
1653 current_frame.pop_stack(type, CHECK_VERIFY(this));
1654 no_control_flow = true; break;
1655 default:
1656 // We only need to check the valid bytecodes in class file.
1657 // And jsr and ret are not in the new class file format in JDK1.5.
1658 verify_error(ErrorContext::bad_code(bci),
1659 "Bad instruction: %02x", opcode);
1660 no_control_flow = false;
1661 return;
1662 } // end switch
1663 } // end Merge with the next instruction
1665 // Look for possible jump target in exception handlers and see if it
1666 // matches current_frame
1667 if (bci >= ex_min && bci < ex_max) {
1668 verify_exception_handler_targets(
1669 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1670 }
1671 } // end while
1673 // Make sure that control flow does not fall through end of the method
1674 if (!no_control_flow) {
1675 verify_error(ErrorContext::bad_code(code_length),
1676 "Control flow falls through code end");
1677 return;
1678 }
1679 }
1681 #undef bad_type_message
1683 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1684 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1685 memset(code_data, 0, sizeof(char) * code_length);
1686 RawBytecodeStream bcs(m);
1688 while (!bcs.is_last_bytecode()) {
1689 if (bcs.raw_next() != Bytecodes::_illegal) {
1690 int bci = bcs.bci();
1691 if (bcs.raw_code() == Bytecodes::_new) {
1692 code_data[bci] = NEW_OFFSET;
1693 } else {
1694 code_data[bci] = BYTECODE_OFFSET;
1695 }
1696 } else {
1697 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1698 return NULL;
1699 }
1700 }
1702 return code_data;
1703 }
1705 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1706 ExceptionTable exhandlers(_method());
1707 int exlength = exhandlers.length();
1708 constantPoolHandle cp (THREAD, _method->constants());
1710 for(int i = 0; i < exlength; i++) {
1711 //reacquire the table in case a GC happened
1712 ExceptionTable exhandlers(_method());
1713 u2 start_pc = exhandlers.start_pc(i);
1714 u2 end_pc = exhandlers.end_pc(i);
1715 u2 handler_pc = exhandlers.handler_pc(i);
1716 if (start_pc >= code_length || code_data[start_pc] == 0) {
1717 class_format_error("Illegal exception table start_pc %d", start_pc);
1718 return;
1719 }
1720 if (end_pc != code_length) { // special case: end_pc == code_length
1721 if (end_pc > code_length || code_data[end_pc] == 0) {
1722 class_format_error("Illegal exception table end_pc %d", end_pc);
1723 return;
1724 }
1725 }
1726 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1727 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1728 return;
1729 }
1730 int catch_type_index = exhandlers.catch_type_index(i);
1731 if (catch_type_index != 0) {
1732 VerificationType catch_type = cp_index_to_type(
1733 catch_type_index, cp, CHECK_VERIFY(this));
1734 VerificationType throwable =
1735 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1736 bool is_subclass = throwable.is_assignable_from(
1737 catch_type, this, CHECK_VERIFY(this));
1738 if (!is_subclass) {
1739 // 4286534: should throw VerifyError according to recent spec change
1740 verify_error(ErrorContext::bad_type(handler_pc,
1741 TypeOrigin::cp(catch_type_index, catch_type),
1742 TypeOrigin::implicit(throwable)),
1743 "Catch type is not a subclass "
1744 "of Throwable in exception handler %d", handler_pc);
1745 return;
1746 }
1747 }
1748 if (start_pc < min) min = start_pc;
1749 if (end_pc > max) max = end_pc;
1750 }
1751 }
1753 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1754 int localvariable_table_length = _method()->localvariable_table_length();
1755 if (localvariable_table_length > 0) {
1756 LocalVariableTableElement* table = _method()->localvariable_table_start();
1757 for (int i = 0; i < localvariable_table_length; i++) {
1758 u2 start_bci = table[i].start_bci;
1759 u2 length = table[i].length;
1761 if (start_bci >= code_length || code_data[start_bci] == 0) {
1762 class_format_error(
1763 "Illegal local variable table start_pc %d", start_bci);
1764 return;
1765 }
1766 u4 end_bci = (u4)(start_bci + length);
1767 if (end_bci != code_length) {
1768 if (end_bci >= code_length || code_data[end_bci] == 0) {
1769 class_format_error( "Illegal local variable table length %d", length);
1770 return;
1771 }
1772 }
1773 }
1774 }
1775 }
1777 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1778 StackMapFrame* current_frame,
1779 StackMapTable* stackmap_table,
1780 bool no_control_flow, TRAPS) {
1781 if (stackmap_index < stackmap_table->get_frame_count()) {
1782 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1783 if (no_control_flow && this_offset > bci) {
1784 verify_error(ErrorContext::missing_stackmap(bci),
1785 "Expecting a stack map frame");
1786 return 0;
1787 }
1788 if (this_offset == bci) {
1789 ErrorContext ctx;
1790 // See if current stack map can be assigned to the frame in table.
1791 // current_frame is the stackmap frame got from the last instruction.
1792 // If matched, current_frame will be updated by this method.
1793 bool matches = stackmap_table->match_stackmap(
1794 current_frame, this_offset, stackmap_index,
1795 !no_control_flow, true, false, &ctx, CHECK_VERIFY_(this, 0));
1796 if (!matches) {
1797 // report type error
1798 verify_error(ctx, "Instruction type does not match stack map");
1799 return 0;
1800 }
1801 stackmap_index++;
1802 } else if (this_offset < bci) {
1803 // current_offset should have met this_offset.
1804 class_format_error("Bad stack map offset %d", this_offset);
1805 return 0;
1806 }
1807 } else if (no_control_flow) {
1808 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1809 return 0;
1810 }
1811 return stackmap_index;
1812 }
1814 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1815 StackMapTable* stackmap_table, TRAPS) {
1816 constantPoolHandle cp (THREAD, _method->constants());
1817 ExceptionTable exhandlers(_method());
1818 int exlength = exhandlers.length();
1819 for(int i = 0; i < exlength; i++) {
1820 //reacquire the table in case a GC happened
1821 ExceptionTable exhandlers(_method());
1822 u2 start_pc = exhandlers.start_pc(i);
1823 u2 end_pc = exhandlers.end_pc(i);
1824 u2 handler_pc = exhandlers.handler_pc(i);
1825 int catch_type_index = exhandlers.catch_type_index(i);
1826 if(bci >= start_pc && bci < end_pc) {
1827 u1 flags = current_frame->flags();
1828 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1829 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1830 if (catch_type_index != 0) {
1831 // We know that this index refers to a subclass of Throwable
1832 VerificationType catch_type = cp_index_to_type(
1833 catch_type_index, cp, CHECK_VERIFY(this));
1834 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1835 } else {
1836 VerificationType throwable =
1837 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1838 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1839 }
1840 ErrorContext ctx;
1841 bool matches = stackmap_table->match_stackmap(
1842 new_frame, handler_pc, true, false, true, &ctx, CHECK_VERIFY(this));
1843 if (!matches) {
1844 verify_error(ctx, "Stack map does not match the one at "
1845 "exception handler %d", handler_pc);
1846 return;
1847 }
1848 }
1849 }
1850 }
1852 void ClassVerifier::verify_cp_index(
1853 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1854 int nconstants = cp->length();
1855 if ((index <= 0) || (index >= nconstants)) {
1856 verify_error(ErrorContext::bad_cp_index(bci, index),
1857 "Illegal constant pool index %d in class %s",
1858 index, cp->pool_holder()->external_name());
1859 return;
1860 }
1861 }
1863 void ClassVerifier::verify_cp_type(
1864 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1866 // In some situations, bytecode rewriting may occur while we're verifying.
1867 // In this case, a constant pool cache exists and some indices refer to that
1868 // instead. Be sure we don't pick up such indices by accident.
1869 // We must check was_recursively_verified() before we get here.
1870 guarantee(cp->cache() == NULL, "not rewritten yet");
1872 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1873 unsigned int tag = cp->tag_at(index).value();
1874 if ((types & (1 << tag)) == 0) {
1875 verify_error(ErrorContext::bad_cp_index(bci, index),
1876 "Illegal type at constant pool entry %d in class %s",
1877 index, cp->pool_holder()->external_name());
1878 return;
1879 }
1880 }
1882 void ClassVerifier::verify_cp_class_type(
1883 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1884 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1885 constantTag tag = cp->tag_at(index);
1886 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1887 verify_error(ErrorContext::bad_cp_index(bci, index),
1888 "Illegal type at constant pool entry %d in class %s",
1889 index, cp->pool_holder()->external_name());
1890 return;
1891 }
1892 }
1894 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1895 stringStream ss;
1897 ctx.reset_frames();
1898 _exception_type = vmSymbols::java_lang_VerifyError();
1899 _error_context = ctx;
1900 va_list va;
1901 va_start(va, msg);
1902 ss.vprint(msg, va);
1903 va_end(va);
1904 _message = ss.as_string();
1905 #ifdef ASSERT
1906 ResourceMark rm;
1907 const char* exception_name = _exception_type->as_C_string();
1908 Exceptions::debug_check_abort(exception_name, NULL);
1909 #endif // ndef ASSERT
1910 }
1912 void ClassVerifier::class_format_error(const char* msg, ...) {
1913 stringStream ss;
1914 _exception_type = vmSymbols::java_lang_ClassFormatError();
1915 va_list va;
1916 va_start(va, msg);
1917 ss.vprint(msg, va);
1918 va_end(va);
1919 if (!_method.is_null()) {
1920 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1921 }
1922 _message = ss.as_string();
1923 }
1925 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1926 // Get current loader and protection domain first.
1927 oop loader = current_class()->class_loader();
1928 oop protection_domain = current_class()->protection_domain();
1930 return SystemDictionary::resolve_or_fail(
1931 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1932 true, CHECK_NULL);
1933 }
1935 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1936 Klass* target_class,
1937 Symbol* field_name,
1938 Symbol* field_sig,
1939 bool is_method) {
1940 No_Safepoint_Verifier nosafepoint;
1942 // If target class isn't a super class of this class, we don't worry about this case
1943 if (!this_class->is_subclass_of(target_class)) {
1944 return false;
1945 }
1946 // Check if the specified method or field is protected
1947 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1948 fieldDescriptor fd;
1949 if (is_method) {
1950 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::normal);
1951 if (m != NULL && m->is_protected()) {
1952 if (!this_class->is_same_class_package(m->method_holder())) {
1953 return true;
1954 }
1955 }
1956 } else {
1957 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1958 if (member_klass != NULL && fd.is_protected()) {
1959 if (!this_class->is_same_class_package(member_klass)) {
1960 return true;
1961 }
1962 }
1963 }
1964 return false;
1965 }
1967 void ClassVerifier::verify_ldc(
1968 int opcode, u2 index, StackMapFrame* current_frame,
1969 constantPoolHandle cp, u2 bci, TRAPS) {
1970 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1971 constantTag tag = cp->tag_at(index);
1972 unsigned int types;
1973 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1974 if (!tag.is_unresolved_klass()) {
1975 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1976 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1977 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1978 // Note: The class file parser already verified the legality of
1979 // MethodHandle and MethodType constants.
1980 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1981 }
1982 } else {
1983 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1984 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1985 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1986 }
1987 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1988 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1989 } else if (tag.is_string()) {
1990 current_frame->push_stack(
1991 VerificationType::reference_type(
1992 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1993 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1994 current_frame->push_stack(
1995 VerificationType::reference_type(
1996 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
1997 } else if (tag.is_int()) {
1998 current_frame->push_stack(
1999 VerificationType::integer_type(), CHECK_VERIFY(this));
2000 } else if (tag.is_float()) {
2001 current_frame->push_stack(
2002 VerificationType::float_type(), CHECK_VERIFY(this));
2003 } else if (tag.is_double()) {
2004 current_frame->push_stack_2(
2005 VerificationType::double_type(),
2006 VerificationType::double2_type(), CHECK_VERIFY(this));
2007 } else if (tag.is_long()) {
2008 current_frame->push_stack_2(
2009 VerificationType::long_type(),
2010 VerificationType::long2_type(), CHECK_VERIFY(this));
2011 } else if (tag.is_method_handle()) {
2012 current_frame->push_stack(
2013 VerificationType::reference_type(
2014 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2015 } else if (tag.is_method_type()) {
2016 current_frame->push_stack(
2017 VerificationType::reference_type(
2018 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2019 } else {
2020 /* Unreachable? verify_cp_type has already validated the cp type. */
2021 verify_error(
2022 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2023 return;
2024 }
2025 }
2027 void ClassVerifier::verify_switch(
2028 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2029 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2030 int bci = bcs->bci();
2031 address bcp = bcs->bcp();
2032 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2034 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2035 // 4639449 & 4647081: padding bytes must be 0
2036 u2 padding_offset = 1;
2037 while ((bcp + padding_offset) < aligned_bcp) {
2038 if(*(bcp + padding_offset) != 0) {
2039 verify_error(ErrorContext::bad_code(bci),
2040 "Nonzero padding byte in lookswitch or tableswitch");
2041 return;
2042 }
2043 padding_offset++;
2044 }
2045 }
2047 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2048 int keys, delta;
2049 current_frame->pop_stack(
2050 VerificationType::integer_type(), CHECK_VERIFY(this));
2051 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2052 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2053 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2054 if (low > high) {
2055 verify_error(ErrorContext::bad_code(bci),
2056 "low must be less than or equal to high in tableswitch");
2057 return;
2058 }
2059 keys = high - low + 1;
2060 if (keys < 0) {
2061 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2062 return;
2063 }
2064 delta = 1;
2065 } else {
2066 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2067 if (keys < 0) {
2068 verify_error(ErrorContext::bad_code(bci),
2069 "number of keys in lookupswitch less than 0");
2070 return;
2071 }
2072 delta = 2;
2073 // Make sure that the lookupswitch items are sorted
2074 for (int i = 0; i < (keys - 1); i++) {
2075 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2076 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2077 if (this_key >= next_key) {
2078 verify_error(ErrorContext::bad_code(bci),
2079 "Bad lookupswitch instruction");
2080 return;
2081 }
2082 }
2083 }
2084 int target = bci + default_offset;
2085 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2086 for (int i = 0; i < keys; i++) {
2087 // Because check_jump_target() may safepoint, the bytecode could have
2088 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2089 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2090 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2091 stackmap_table->check_jump_target(
2092 current_frame, target, CHECK_VERIFY(this));
2093 }
2094 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2095 }
2097 bool ClassVerifier::name_in_supers(
2098 Symbol* ref_name, instanceKlassHandle current) {
2099 Klass* super = current->super();
2100 while (super != NULL) {
2101 if (super->name() == ref_name) {
2102 return true;
2103 }
2104 super = super->super();
2105 }
2106 return false;
2107 }
2109 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2110 StackMapFrame* current_frame,
2111 constantPoolHandle cp,
2112 TRAPS) {
2113 u2 index = bcs->get_index_u2();
2114 verify_cp_type(bcs->bci(), index, cp,
2115 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2117 // Get field name and signature
2118 Symbol* field_name = cp->name_ref_at(index);
2119 Symbol* field_sig = cp->signature_ref_at(index);
2121 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2122 class_format_error(
2123 "Invalid signature for field in class %s referenced "
2124 "from constant pool index %d", _klass->external_name(), index);
2125 return;
2126 }
2128 // Get referenced class type
2129 VerificationType ref_class_type = cp_ref_index_to_type(
2130 index, cp, CHECK_VERIFY(this));
2131 if (!ref_class_type.is_object()) {
2132 /* Unreachable? Class file parser verifies Fieldref contents */
2133 verify_error(ErrorContext::bad_type(bcs->bci(),
2134 TypeOrigin::cp(index, ref_class_type)),
2135 "Expecting reference to class in class %s at constant pool index %d",
2136 _klass->external_name(), index);
2137 return;
2138 }
2139 VerificationType target_class_type = ref_class_type;
2141 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2142 "buffer type must match VerificationType size");
2143 uintptr_t field_type_buffer[2];
2144 VerificationType* field_type = (VerificationType*)field_type_buffer;
2145 // If we make a VerificationType[2] array directly, the compiler calls
2146 // to the c-runtime library to do the allocation instead of just
2147 // stack allocating it. Plus it would run constructors. This shows up
2148 // in performance profiles.
2150 SignatureStream sig_stream(field_sig, false);
2151 VerificationType stack_object_type;
2152 int n = change_sig_to_verificationType(
2153 &sig_stream, field_type, CHECK_VERIFY(this));
2154 u2 bci = bcs->bci();
2155 bool is_assignable;
2156 switch (bcs->raw_code()) {
2157 case Bytecodes::_getstatic: {
2158 for (int i = 0; i < n; i++) {
2159 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2160 }
2161 break;
2162 }
2163 case Bytecodes::_putstatic: {
2164 for (int i = n - 1; i >= 0; i--) {
2165 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2166 }
2167 break;
2168 }
2169 case Bytecodes::_getfield: {
2170 stack_object_type = current_frame->pop_stack(
2171 target_class_type, CHECK_VERIFY(this));
2172 for (int i = 0; i < n; i++) {
2173 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2174 }
2175 goto check_protected;
2176 }
2177 case Bytecodes::_putfield: {
2178 for (int i = n - 1; i >= 0; i--) {
2179 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2180 }
2181 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2183 // The JVMS 2nd edition allows field initialization before the superclass
2184 // initializer, if the field is defined within the current class.
2185 fieldDescriptor fd;
2186 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2187 target_class_type.equals(current_type()) &&
2188 _klass->find_local_field(field_name, field_sig, &fd)) {
2189 stack_object_type = current_type();
2190 }
2191 is_assignable = target_class_type.is_assignable_from(
2192 stack_object_type, this, CHECK_VERIFY(this));
2193 if (!is_assignable) {
2194 verify_error(ErrorContext::bad_type(bci,
2195 current_frame->stack_top_ctx(),
2196 TypeOrigin::cp(index, target_class_type)),
2197 "Bad type on operand stack in putfield");
2198 return;
2199 }
2200 }
2201 check_protected: {
2202 if (_this_type == stack_object_type)
2203 break; // stack_object_type must be assignable to _current_class_type
2204 Symbol* ref_class_name =
2205 cp->klass_name_at(cp->klass_ref_index_at(index));
2206 if (!name_in_supers(ref_class_name, current_class()))
2207 // stack_object_type must be assignable to _current_class_type since:
2208 // 1. stack_object_type must be assignable to ref_class.
2209 // 2. ref_class must be _current_class or a subclass of it. It can't
2210 // be a superclass of it. See revised JVMS 5.4.4.
2211 break;
2213 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2214 if (is_protected_access(current_class(), ref_class_oop, field_name,
2215 field_sig, false)) {
2216 // It's protected access, check if stack object is assignable to
2217 // current class.
2218 is_assignable = current_type().is_assignable_from(
2219 stack_object_type, this, CHECK_VERIFY(this));
2220 if (!is_assignable) {
2221 verify_error(ErrorContext::bad_type(bci,
2222 current_frame->stack_top_ctx(),
2223 TypeOrigin::implicit(current_type())),
2224 "Bad access to protected data in getfield");
2225 return;
2226 }
2227 }
2228 break;
2229 }
2230 default: ShouldNotReachHere();
2231 }
2232 }
2234 void ClassVerifier::verify_invoke_init(
2235 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2236 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2237 constantPoolHandle cp, TRAPS) {
2238 u2 bci = bcs->bci();
2239 VerificationType type = current_frame->pop_stack(
2240 VerificationType::reference_check(), CHECK_VERIFY(this));
2241 if (type == VerificationType::uninitialized_this_type()) {
2242 // The method must be an <init> method of this class or its superclass
2243 Klass* superk = current_class()->super();
2244 if (ref_class_type.name() != current_class()->name() &&
2245 ref_class_type.name() != superk->name()) {
2246 verify_error(ErrorContext::bad_type(bci,
2247 TypeOrigin::implicit(ref_class_type),
2248 TypeOrigin::implicit(current_type())),
2249 "Bad <init> method call");
2250 return;
2251 }
2253 // Make sure that this call is not done from within a TRY block because
2254 // that can result in returning an incomplete object. Simply checking
2255 // (bci >= start_pc) also ensures that this call is not done after a TRY
2256 // block. That is also illegal because this call must be the first Java
2257 // statement in the constructor.
2258 ExceptionTable exhandlers(_method());
2259 int exlength = exhandlers.length();
2260 for(int i = 0; i < exlength; i++) {
2261 if (bci >= exhandlers.start_pc(i)) {
2262 verify_error(ErrorContext::bad_code(bci),
2263 "Bad <init> method call from after the start of a try block");
2264 return;
2265 }
2266 }
2268 current_frame->initialize_object(type, current_type());
2269 *this_uninit = true;
2270 } else if (type.is_uninitialized()) {
2271 u2 new_offset = type.bci();
2272 address new_bcp = bcs->bcp() - bci + new_offset;
2273 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2274 /* Unreachable? Stack map parsing ensures valid type and new
2275 * instructions have a valid BCI. */
2276 verify_error(ErrorContext::bad_code(new_offset),
2277 "Expecting new instruction");
2278 return;
2279 }
2280 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2281 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2283 // The method must be an <init> method of the indicated class
2284 VerificationType new_class_type = cp_index_to_type(
2285 new_class_index, cp, CHECK_VERIFY(this));
2286 if (!new_class_type.equals(ref_class_type)) {
2287 verify_error(ErrorContext::bad_type(bci,
2288 TypeOrigin::cp(new_class_index, new_class_type),
2289 TypeOrigin::cp(ref_class_index, ref_class_type)),
2290 "Call to wrong <init> method");
2291 return;
2292 }
2293 // According to the VM spec, if the referent class is a superclass of the
2294 // current class, and is in a different runtime package, and the method is
2295 // protected, then the objectref must be the current class or a subclass
2296 // of the current class.
2297 VerificationType objectref_type = new_class_type;
2298 if (name_in_supers(ref_class_type.name(), current_class())) {
2299 Klass* ref_klass = load_class(
2300 ref_class_type.name(), CHECK_VERIFY(this));
2301 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2302 vmSymbols::object_initializer_name(),
2303 cp->signature_ref_at(bcs->get_index_u2()), Klass::normal);
2304 // Do nothing if method is not found. Let resolution detect the error.
2305 if (m != NULL) {
2306 instanceKlassHandle mh(THREAD, m->method_holder());
2307 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2308 bool assignable = current_type().is_assignable_from(
2309 objectref_type, this, CHECK_VERIFY(this));
2310 if (!assignable) {
2311 verify_error(ErrorContext::bad_type(bci,
2312 TypeOrigin::cp(new_class_index, objectref_type),
2313 TypeOrigin::implicit(current_type())),
2314 "Bad access to protected <init> method");
2315 return;
2316 }
2317 }
2318 }
2319 }
2320 current_frame->initialize_object(type, new_class_type);
2321 } else {
2322 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2323 "Bad operand type when invoking <init>");
2324 return;
2325 }
2326 }
2328 bool ClassVerifier::is_same_or_direct_interface(
2329 instanceKlassHandle klass,
2330 VerificationType klass_type,
2331 VerificationType ref_class_type) {
2332 if (ref_class_type.equals(klass_type)) return true;
2333 Array<Klass*>* local_interfaces = klass->local_interfaces();
2334 if (local_interfaces != NULL) {
2335 for (int x = 0; x < local_interfaces->length(); x++) {
2336 Klass* k = local_interfaces->at(x);
2337 assert (k != NULL && k->is_interface(), "invalid interface");
2338 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2339 return true;
2340 }
2341 }
2342 }
2343 return false;
2344 }
2346 void ClassVerifier::verify_invoke_instructions(
2347 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2348 bool *this_uninit, VerificationType return_type,
2349 constantPoolHandle cp, TRAPS) {
2350 // Make sure the constant pool item is the right type
2351 u2 index = bcs->get_index_u2();
2352 Bytecodes::Code opcode = bcs->raw_code();
2353 unsigned int types;
2354 switch (opcode) {
2355 case Bytecodes::_invokeinterface:
2356 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2357 break;
2358 case Bytecodes::_invokedynamic:
2359 types = 1 << JVM_CONSTANT_InvokeDynamic;
2360 break;
2361 case Bytecodes::_invokespecial:
2362 case Bytecodes::_invokestatic:
2363 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2364 (1 << JVM_CONSTANT_Methodref) :
2365 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2366 break;
2367 default:
2368 types = 1 << JVM_CONSTANT_Methodref;
2369 }
2370 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2372 // Get method name and signature
2373 Symbol* method_name = cp->name_ref_at(index);
2374 Symbol* method_sig = cp->signature_ref_at(index);
2376 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2377 class_format_error(
2378 "Invalid method signature in class %s referenced "
2379 "from constant pool index %d", _klass->external_name(), index);
2380 return;
2381 }
2383 // Get referenced class type
2384 VerificationType ref_class_type;
2385 if (opcode == Bytecodes::_invokedynamic) {
2386 if (!EnableInvokeDynamic ||
2387 _klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2388 if (!EnableInvokeDynamic) {
2389 class_format_error("invokedynamic instructions not enabled in this JVM");
2390 } else {
2391 class_format_error("invokedynamic instructions not supported by this class file version (%d), class %s",
2392 _klass->major_version(), _klass->external_name());
2393 }
2394 return;
2395 }
2396 } else {
2397 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2398 }
2400 // For a small signature length, we just allocate 128 bytes instead
2401 // of parsing the signature once to find its size.
2402 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2403 // longs/doubles to be consertive.
2404 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2405 "buffer type must match VerificationType size");
2406 uintptr_t on_stack_sig_types_buffer[128];
2407 // If we make a VerificationType[128] array directly, the compiler calls
2408 // to the c-runtime library to do the allocation instead of just
2409 // stack allocating it. Plus it would run constructors. This shows up
2410 // in performance profiles.
2412 VerificationType* sig_types;
2413 int size = (method_sig->utf8_length() - 3) * 2;
2414 if (size > 128) {
2415 // Long and double occupies two slots here.
2416 ArgumentSizeComputer size_it(method_sig);
2417 size = size_it.size();
2418 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2419 } else{
2420 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2421 }
2422 SignatureStream sig_stream(method_sig);
2423 int sig_i = 0;
2424 while (!sig_stream.at_return_type()) {
2425 sig_i += change_sig_to_verificationType(
2426 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2427 sig_stream.next();
2428 }
2429 int nargs = sig_i;
2431 #ifdef ASSERT
2432 {
2433 ArgumentSizeComputer size_it(method_sig);
2434 assert(nargs == size_it.size(), "Argument sizes do not match");
2435 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2436 }
2437 #endif
2439 // Check instruction operands
2440 u2 bci = bcs->bci();
2441 if (opcode == Bytecodes::_invokeinterface) {
2442 address bcp = bcs->bcp();
2443 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2444 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2445 // the difference between the size of the operand stack before and after the instruction
2446 // executes.
2447 if (*(bcp+3) != (nargs+1)) {
2448 verify_error(ErrorContext::bad_code(bci),
2449 "Inconsistent args count operand in invokeinterface");
2450 return;
2451 }
2452 if (*(bcp+4) != 0) {
2453 verify_error(ErrorContext::bad_code(bci),
2454 "Fourth operand byte of invokeinterface must be zero");
2455 return;
2456 }
2457 }
2459 if (opcode == Bytecodes::_invokedynamic) {
2460 address bcp = bcs->bcp();
2461 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2462 verify_error(ErrorContext::bad_code(bci),
2463 "Third and fourth operand bytes of invokedynamic must be zero");
2464 return;
2465 }
2466 }
2468 if (method_name->byte_at(0) == '<') {
2469 // Make sure <init> can only be invoked by invokespecial
2470 if (opcode != Bytecodes::_invokespecial ||
2471 method_name != vmSymbols::object_initializer_name()) {
2472 verify_error(ErrorContext::bad_code(bci),
2473 "Illegal call to internal method");
2474 return;
2475 }
2476 } else if (opcode == Bytecodes::_invokespecial
2477 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2478 && !ref_class_type.equals(VerificationType::reference_type(
2479 current_class()->super()->name()))) {
2480 bool subtype = false;
2481 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2482 if (!current_class()->is_anonymous()) {
2483 subtype = ref_class_type.is_assignable_from(
2484 current_type(), this, CHECK_VERIFY(this));
2485 } else {
2486 VerificationType host_klass_type =
2487 VerificationType::reference_type(current_class()->host_klass()->name());
2488 subtype = ref_class_type.is_assignable_from(host_klass_type, this, CHECK_VERIFY(this));
2490 // If invokespecial of IMR, need to recheck for same or
2491 // direct interface relative to the host class
2492 have_imr_indirect = (have_imr_indirect &&
2493 !is_same_or_direct_interface(
2494 InstanceKlass::cast(current_class()->host_klass()),
2495 host_klass_type, ref_class_type));
2496 }
2497 if (!subtype) {
2498 verify_error(ErrorContext::bad_code(bci),
2499 "Bad invokespecial instruction: "
2500 "current class isn't assignable to reference class.");
2501 return;
2502 } else if (have_imr_indirect) {
2503 verify_error(ErrorContext::bad_code(bci),
2504 "Bad invokespecial instruction: "
2505 "interface method reference is in an indirect superinterface.");
2506 return;
2507 }
2509 }
2510 // Match method descriptor with operand stack
2511 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2512 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2513 }
2514 // Check objectref on operand stack
2515 if (opcode != Bytecodes::_invokestatic &&
2516 opcode != Bytecodes::_invokedynamic) {
2517 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2518 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2519 code_length, this_uninit, cp, CHECK_VERIFY(this));
2520 } else { // other methods
2521 // Ensures that target class is assignable to method class.
2522 if (opcode == Bytecodes::_invokespecial) {
2523 if (!current_class()->is_anonymous()) {
2524 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2525 } else {
2526 // anonymous class invokespecial calls: check if the
2527 // objectref is a subtype of the host_klass of the current class
2528 // to allow an anonymous class to reference methods in the host_klass
2529 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2530 VerificationType hosttype =
2531 VerificationType::reference_type(current_class()->host_klass()->name());
2532 bool subtype = hosttype.is_assignable_from(top, this, CHECK_VERIFY(this));
2533 if (!subtype) {
2534 verify_error( ErrorContext::bad_type(current_frame->offset(),
2535 current_frame->stack_top_ctx(),
2536 TypeOrigin::implicit(top)),
2537 "Bad type on operand stack");
2538 return;
2539 }
2540 }
2541 } else if (opcode == Bytecodes::_invokevirtual) {
2542 VerificationType stack_object_type =
2543 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2544 if (current_type() != stack_object_type) {
2545 assert(cp->cache() == NULL, "not rewritten yet");
2546 Symbol* ref_class_name =
2547 cp->klass_name_at(cp->klass_ref_index_at(index));
2548 // See the comments in verify_field_instructions() for
2549 // the rationale behind this.
2550 if (name_in_supers(ref_class_name, current_class())) {
2551 Klass* ref_class = load_class(ref_class_name, CHECK);
2552 if (is_protected_access(
2553 _klass, ref_class, method_name, method_sig, true)) {
2554 // It's protected access, check if stack object is
2555 // assignable to current class.
2556 bool is_assignable = current_type().is_assignable_from(
2557 stack_object_type, this, CHECK_VERIFY(this));
2558 if (!is_assignable) {
2559 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2560 && stack_object_type.is_array()
2561 && method_name == vmSymbols::clone_name()) {
2562 // Special case: arrays pretend to implement public Object
2563 // clone().
2564 } else {
2565 verify_error(ErrorContext::bad_type(bci,
2566 current_frame->stack_top_ctx(),
2567 TypeOrigin::implicit(current_type())),
2568 "Bad access to protected data in invokevirtual");
2569 return;
2570 }
2571 }
2572 }
2573 }
2574 }
2575 } else {
2576 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2577 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2578 }
2579 }
2580 }
2581 // Push the result type.
2582 if (sig_stream.type() != T_VOID) {
2583 if (method_name == vmSymbols::object_initializer_name()) {
2584 // <init> method must have a void return type
2585 /* Unreachable? Class file parser verifies that methods with '<' have
2586 * void return */
2587 verify_error(ErrorContext::bad_code(bci),
2588 "Return type must be void in <init> method");
2589 return;
2590 }
2591 VerificationType return_type[2];
2592 int n = change_sig_to_verificationType(
2593 &sig_stream, return_type, CHECK_VERIFY(this));
2594 for (int i = 0; i < n; i++) {
2595 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2596 }
2597 }
2598 }
2600 VerificationType ClassVerifier::get_newarray_type(
2601 u2 index, u2 bci, TRAPS) {
2602 const char* from_bt[] = {
2603 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2604 };
2605 if (index < T_BOOLEAN || index > T_LONG) {
2606 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2607 return VerificationType::bogus_type();
2608 }
2610 // from_bt[index] contains the array signature which has a length of 2
2611 Symbol* sig = create_temporary_symbol(
2612 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2613 return VerificationType::reference_type(sig);
2614 }
2616 void ClassVerifier::verify_anewarray(
2617 u2 bci, u2 index, constantPoolHandle cp,
2618 StackMapFrame* current_frame, TRAPS) {
2619 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2620 current_frame->pop_stack(
2621 VerificationType::integer_type(), CHECK_VERIFY(this));
2623 VerificationType component_type =
2624 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2625 int length;
2626 char* arr_sig_str;
2627 if (component_type.is_array()) { // it's an array
2628 const char* component_name = component_type.name()->as_utf8();
2629 // add one dimension to component
2630 length = (int)strlen(component_name) + 1;
2631 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2632 arr_sig_str[0] = '[';
2633 strncpy(&arr_sig_str[1], component_name, length - 1);
2634 } else { // it's an object or interface
2635 const char* component_name = component_type.name()->as_utf8();
2636 // add one dimension to component with 'L' prepended and ';' postpended.
2637 length = (int)strlen(component_name) + 3;
2638 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2639 arr_sig_str[0] = '[';
2640 arr_sig_str[1] = 'L';
2641 strncpy(&arr_sig_str[2], component_name, length - 2);
2642 arr_sig_str[length - 1] = ';';
2643 }
2644 Symbol* arr_sig = create_temporary_symbol(
2645 arr_sig_str, length, CHECK_VERIFY(this));
2646 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2647 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2648 }
2650 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2651 current_frame->get_local(
2652 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2653 current_frame->push_stack(
2654 VerificationType::integer_type(), CHECK_VERIFY(this));
2655 }
2657 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2658 current_frame->get_local_2(
2659 index, VerificationType::long_type(),
2660 VerificationType::long2_type(), CHECK_VERIFY(this));
2661 current_frame->push_stack_2(
2662 VerificationType::long_type(),
2663 VerificationType::long2_type(), CHECK_VERIFY(this));
2664 }
2666 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2667 current_frame->get_local(
2668 index, VerificationType::float_type(), CHECK_VERIFY(this));
2669 current_frame->push_stack(
2670 VerificationType::float_type(), CHECK_VERIFY(this));
2671 }
2673 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2674 current_frame->get_local_2(
2675 index, VerificationType::double_type(),
2676 VerificationType::double2_type(), CHECK_VERIFY(this));
2677 current_frame->push_stack_2(
2678 VerificationType::double_type(),
2679 VerificationType::double2_type(), CHECK_VERIFY(this));
2680 }
2682 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2683 VerificationType type = current_frame->get_local(
2684 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2685 current_frame->push_stack(type, CHECK_VERIFY(this));
2686 }
2688 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2689 current_frame->pop_stack(
2690 VerificationType::integer_type(), CHECK_VERIFY(this));
2691 current_frame->set_local(
2692 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2693 }
2695 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2696 current_frame->pop_stack_2(
2697 VerificationType::long2_type(),
2698 VerificationType::long_type(), CHECK_VERIFY(this));
2699 current_frame->set_local_2(
2700 index, VerificationType::long_type(),
2701 VerificationType::long2_type(), CHECK_VERIFY(this));
2702 }
2704 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2705 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2706 current_frame->set_local(
2707 index, VerificationType::float_type(), CHECK_VERIFY(this));
2708 }
2710 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2711 current_frame->pop_stack_2(
2712 VerificationType::double2_type(),
2713 VerificationType::double_type(), CHECK_VERIFY(this));
2714 current_frame->set_local_2(
2715 index, VerificationType::double_type(),
2716 VerificationType::double2_type(), CHECK_VERIFY(this));
2717 }
2719 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2720 VerificationType type = current_frame->pop_stack(
2721 VerificationType::reference_check(), CHECK_VERIFY(this));
2722 current_frame->set_local(index, type, CHECK_VERIFY(this));
2723 }
2725 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2726 VerificationType type = current_frame->get_local(
2727 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2728 current_frame->set_local(index, type, CHECK_VERIFY(this));
2729 }
2731 void ClassVerifier::verify_return_value(
2732 VerificationType return_type, VerificationType type, u2 bci,
2733 StackMapFrame* current_frame, TRAPS) {
2734 if (return_type == VerificationType::bogus_type()) {
2735 verify_error(ErrorContext::bad_type(bci,
2736 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2737 "Method expects a return value");
2738 return;
2739 }
2740 bool match = return_type.is_assignable_from(type, this, CHECK_VERIFY(this));
2741 if (!match) {
2742 verify_error(ErrorContext::bad_type(bci,
2743 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2744 "Bad return type");
2745 return;
2746 }
2747 }
2749 // The verifier creates symbols which are substrings of Symbols.
2750 // These are stored in the verifier until the end of verification so that
2751 // they can be reference counted.
2752 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2753 int end, TRAPS) {
2754 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2755 _symbols->push(sym);
2756 return sym;
2757 }
2759 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2760 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2761 _symbols->push(sym);
2762 return sym;
2763 }
