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src/share/vm/classfile/verifier.cpp@f73af4455d7d
src/share/vm/classfile/verifier.cpp
Thu, 29 May 2014 09:56:06 -0700
- author
- asaha
- date
- Thu, 29 May 2014 09:56:06 -0700
- changeset 6782
- f73af4455d7d
- parent 6779
- 364b73402247
- parent 6680
- 78bbf4d43a14
- child 6785
- d6fcbd1e1075
- child 6830
- 54bc75c144b0
- permissions
- -rw-r--r--
Merge
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.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 set_furthest_jump(0);
639 Bytecodes::Code opcode;
640 while (!bcs.is_last_bytecode()) {
641 // Check for recursive re-verification before each bytecode.
642 if (was_recursively_verified()) return;
644 opcode = bcs.raw_next();
645 u2 bci = bcs.bci();
647 // Set current frame's offset to bci
648 current_frame.set_offset(bci);
649 current_frame.set_mark();
651 // Make sure every offset in stackmap table point to the beginning to
652 // an instruction. Match current_frame to stackmap_table entry with
653 // the same offset if exists.
654 stackmap_index = verify_stackmap_table(
655 stackmap_index, bci, ¤t_frame, &stackmap_table,
656 no_control_flow, CHECK_VERIFY(this));
659 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
661 // Merge with the next instruction
662 {
663 u2 index;
664 int target;
665 VerificationType type, type2;
666 VerificationType atype;
668 #ifndef PRODUCT
669 if (VerboseVerification) {
670 current_frame.print_on(tty);
671 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
672 }
673 #endif
675 // Make sure wide instruction is in correct format
676 if (bcs.is_wide()) {
677 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
678 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
679 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
680 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
681 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
682 opcode != Bytecodes::_dstore) {
683 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
684 * if we encounter a wide instruction that modifies an invalid
685 * opcode (not one of the ones listed above) */
686 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
687 return;
688 }
689 }
691 switch (opcode) {
692 case Bytecodes::_nop :
693 no_control_flow = false; break;
694 case Bytecodes::_aconst_null :
695 current_frame.push_stack(
696 VerificationType::null_type(), CHECK_VERIFY(this));
697 no_control_flow = false; break;
698 case Bytecodes::_iconst_m1 :
699 case Bytecodes::_iconst_0 :
700 case Bytecodes::_iconst_1 :
701 case Bytecodes::_iconst_2 :
702 case Bytecodes::_iconst_3 :
703 case Bytecodes::_iconst_4 :
704 case Bytecodes::_iconst_5 :
705 current_frame.push_stack(
706 VerificationType::integer_type(), CHECK_VERIFY(this));
707 no_control_flow = false; break;
708 case Bytecodes::_lconst_0 :
709 case Bytecodes::_lconst_1 :
710 current_frame.push_stack_2(
711 VerificationType::long_type(),
712 VerificationType::long2_type(), CHECK_VERIFY(this));
713 no_control_flow = false; break;
714 case Bytecodes::_fconst_0 :
715 case Bytecodes::_fconst_1 :
716 case Bytecodes::_fconst_2 :
717 current_frame.push_stack(
718 VerificationType::float_type(), CHECK_VERIFY(this));
719 no_control_flow = false; break;
720 case Bytecodes::_dconst_0 :
721 case Bytecodes::_dconst_1 :
722 current_frame.push_stack_2(
723 VerificationType::double_type(),
724 VerificationType::double2_type(), CHECK_VERIFY(this));
725 no_control_flow = false; break;
726 case Bytecodes::_sipush :
727 case Bytecodes::_bipush :
728 current_frame.push_stack(
729 VerificationType::integer_type(), CHECK_VERIFY(this));
730 no_control_flow = false; break;
731 case Bytecodes::_ldc :
732 verify_ldc(
733 opcode, bcs.get_index_u1(), ¤t_frame,
734 cp, bci, CHECK_VERIFY(this));
735 no_control_flow = false; break;
736 case Bytecodes::_ldc_w :
737 case Bytecodes::_ldc2_w :
738 verify_ldc(
739 opcode, bcs.get_index_u2(), ¤t_frame,
740 cp, bci, CHECK_VERIFY(this));
741 no_control_flow = false; break;
742 case Bytecodes::_iload :
743 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
744 no_control_flow = false; break;
745 case Bytecodes::_iload_0 :
746 case Bytecodes::_iload_1 :
747 case Bytecodes::_iload_2 :
748 case Bytecodes::_iload_3 :
749 index = opcode - Bytecodes::_iload_0;
750 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
751 no_control_flow = false; break;
752 case Bytecodes::_lload :
753 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
754 no_control_flow = false; break;
755 case Bytecodes::_lload_0 :
756 case Bytecodes::_lload_1 :
757 case Bytecodes::_lload_2 :
758 case Bytecodes::_lload_3 :
759 index = opcode - Bytecodes::_lload_0;
760 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
761 no_control_flow = false; break;
762 case Bytecodes::_fload :
763 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
764 no_control_flow = false; break;
765 case Bytecodes::_fload_0 :
766 case Bytecodes::_fload_1 :
767 case Bytecodes::_fload_2 :
768 case Bytecodes::_fload_3 :
769 index = opcode - Bytecodes::_fload_0;
770 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
771 no_control_flow = false; break;
772 case Bytecodes::_dload :
773 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
774 no_control_flow = false; break;
775 case Bytecodes::_dload_0 :
776 case Bytecodes::_dload_1 :
777 case Bytecodes::_dload_2 :
778 case Bytecodes::_dload_3 :
779 index = opcode - Bytecodes::_dload_0;
780 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
781 no_control_flow = false; break;
782 case Bytecodes::_aload :
783 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
784 no_control_flow = false; break;
785 case Bytecodes::_aload_0 :
786 case Bytecodes::_aload_1 :
787 case Bytecodes::_aload_2 :
788 case Bytecodes::_aload_3 :
789 index = opcode - Bytecodes::_aload_0;
790 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
791 no_control_flow = false; break;
792 case Bytecodes::_iaload :
793 type = current_frame.pop_stack(
794 VerificationType::integer_type(), CHECK_VERIFY(this));
795 atype = current_frame.pop_stack(
796 VerificationType::reference_check(), CHECK_VERIFY(this));
797 if (!atype.is_int_array()) {
798 verify_error(ErrorContext::bad_type(bci,
799 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
800 bad_type_msg, "iaload");
801 return;
802 }
803 current_frame.push_stack(
804 VerificationType::integer_type(), CHECK_VERIFY(this));
805 no_control_flow = false; break;
806 case Bytecodes::_baload :
807 type = current_frame.pop_stack(
808 VerificationType::integer_type(), CHECK_VERIFY(this));
809 atype = current_frame.pop_stack(
810 VerificationType::reference_check(), CHECK_VERIFY(this));
811 if (!atype.is_bool_array() && !atype.is_byte_array()) {
812 verify_error(
813 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
814 bad_type_msg, "baload");
815 return;
816 }
817 current_frame.push_stack(
818 VerificationType::integer_type(), CHECK_VERIFY(this));
819 no_control_flow = false; break;
820 case Bytecodes::_caload :
821 type = current_frame.pop_stack(
822 VerificationType::integer_type(), CHECK_VERIFY(this));
823 atype = current_frame.pop_stack(
824 VerificationType::reference_check(), CHECK_VERIFY(this));
825 if (!atype.is_char_array()) {
826 verify_error(ErrorContext::bad_type(bci,
827 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
828 bad_type_msg, "caload");
829 return;
830 }
831 current_frame.push_stack(
832 VerificationType::integer_type(), CHECK_VERIFY(this));
833 no_control_flow = false; break;
834 case Bytecodes::_saload :
835 type = current_frame.pop_stack(
836 VerificationType::integer_type(), CHECK_VERIFY(this));
837 atype = current_frame.pop_stack(
838 VerificationType::reference_check(), CHECK_VERIFY(this));
839 if (!atype.is_short_array()) {
840 verify_error(ErrorContext::bad_type(bci,
841 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
842 bad_type_msg, "saload");
843 return;
844 }
845 current_frame.push_stack(
846 VerificationType::integer_type(), CHECK_VERIFY(this));
847 no_control_flow = false; break;
848 case Bytecodes::_laload :
849 type = current_frame.pop_stack(
850 VerificationType::integer_type(), CHECK_VERIFY(this));
851 atype = current_frame.pop_stack(
852 VerificationType::reference_check(), CHECK_VERIFY(this));
853 if (!atype.is_long_array()) {
854 verify_error(ErrorContext::bad_type(bci,
855 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
856 bad_type_msg, "laload");
857 return;
858 }
859 current_frame.push_stack_2(
860 VerificationType::long_type(),
861 VerificationType::long2_type(), CHECK_VERIFY(this));
862 no_control_flow = false; break;
863 case Bytecodes::_faload :
864 type = current_frame.pop_stack(
865 VerificationType::integer_type(), CHECK_VERIFY(this));
866 atype = current_frame.pop_stack(
867 VerificationType::reference_check(), CHECK_VERIFY(this));
868 if (!atype.is_float_array()) {
869 verify_error(ErrorContext::bad_type(bci,
870 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
871 bad_type_msg, "faload");
872 return;
873 }
874 current_frame.push_stack(
875 VerificationType::float_type(), CHECK_VERIFY(this));
876 no_control_flow = false; break;
877 case Bytecodes::_daload :
878 type = current_frame.pop_stack(
879 VerificationType::integer_type(), CHECK_VERIFY(this));
880 atype = current_frame.pop_stack(
881 VerificationType::reference_check(), CHECK_VERIFY(this));
882 if (!atype.is_double_array()) {
883 verify_error(ErrorContext::bad_type(bci,
884 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
885 bad_type_msg, "daload");
886 return;
887 }
888 current_frame.push_stack_2(
889 VerificationType::double_type(),
890 VerificationType::double2_type(), CHECK_VERIFY(this));
891 no_control_flow = false; break;
892 case Bytecodes::_aaload : {
893 type = current_frame.pop_stack(
894 VerificationType::integer_type(), CHECK_VERIFY(this));
895 atype = current_frame.pop_stack(
896 VerificationType::reference_check(), CHECK_VERIFY(this));
897 if (!atype.is_reference_array()) {
898 verify_error(ErrorContext::bad_type(bci,
899 current_frame.stack_top_ctx(),
900 TypeOrigin::implicit(VerificationType::reference_check())),
901 bad_type_msg, "aaload");
902 return;
903 }
904 if (atype.is_null()) {
905 current_frame.push_stack(
906 VerificationType::null_type(), CHECK_VERIFY(this));
907 } else {
908 VerificationType component =
909 atype.get_component(this, CHECK_VERIFY(this));
910 current_frame.push_stack(component, CHECK_VERIFY(this));
911 }
912 no_control_flow = false; break;
913 }
914 case Bytecodes::_istore :
915 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
916 no_control_flow = false; break;
917 case Bytecodes::_istore_0 :
918 case Bytecodes::_istore_1 :
919 case Bytecodes::_istore_2 :
920 case Bytecodes::_istore_3 :
921 index = opcode - Bytecodes::_istore_0;
922 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
923 no_control_flow = false; break;
924 case Bytecodes::_lstore :
925 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
926 no_control_flow = false; break;
927 case Bytecodes::_lstore_0 :
928 case Bytecodes::_lstore_1 :
929 case Bytecodes::_lstore_2 :
930 case Bytecodes::_lstore_3 :
931 index = opcode - Bytecodes::_lstore_0;
932 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
933 no_control_flow = false; break;
934 case Bytecodes::_fstore :
935 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
936 no_control_flow = false; break;
937 case Bytecodes::_fstore_0 :
938 case Bytecodes::_fstore_1 :
939 case Bytecodes::_fstore_2 :
940 case Bytecodes::_fstore_3 :
941 index = opcode - Bytecodes::_fstore_0;
942 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
943 no_control_flow = false; break;
944 case Bytecodes::_dstore :
945 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
946 no_control_flow = false; break;
947 case Bytecodes::_dstore_0 :
948 case Bytecodes::_dstore_1 :
949 case Bytecodes::_dstore_2 :
950 case Bytecodes::_dstore_3 :
951 index = opcode - Bytecodes::_dstore_0;
952 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
953 no_control_flow = false; break;
954 case Bytecodes::_astore :
955 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
956 no_control_flow = false; break;
957 case Bytecodes::_astore_0 :
958 case Bytecodes::_astore_1 :
959 case Bytecodes::_astore_2 :
960 case Bytecodes::_astore_3 :
961 index = opcode - Bytecodes::_astore_0;
962 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
963 no_control_flow = false; break;
964 case Bytecodes::_iastore :
965 type = current_frame.pop_stack(
966 VerificationType::integer_type(), CHECK_VERIFY(this));
967 type2 = current_frame.pop_stack(
968 VerificationType::integer_type(), CHECK_VERIFY(this));
969 atype = current_frame.pop_stack(
970 VerificationType::reference_check(), CHECK_VERIFY(this));
971 if (!atype.is_int_array()) {
972 verify_error(ErrorContext::bad_type(bci,
973 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
974 bad_type_msg, "iastore");
975 return;
976 }
977 no_control_flow = false; break;
978 case Bytecodes::_bastore :
979 type = current_frame.pop_stack(
980 VerificationType::integer_type(), CHECK_VERIFY(this));
981 type2 = current_frame.pop_stack(
982 VerificationType::integer_type(), CHECK_VERIFY(this));
983 atype = current_frame.pop_stack(
984 VerificationType::reference_check(), CHECK_VERIFY(this));
985 if (!atype.is_bool_array() && !atype.is_byte_array()) {
986 verify_error(
987 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
988 bad_type_msg, "bastore");
989 return;
990 }
991 no_control_flow = false; break;
992 case Bytecodes::_castore :
993 current_frame.pop_stack(
994 VerificationType::integer_type(), CHECK_VERIFY(this));
995 current_frame.pop_stack(
996 VerificationType::integer_type(), CHECK_VERIFY(this));
997 atype = current_frame.pop_stack(
998 VerificationType::reference_check(), CHECK_VERIFY(this));
999 if (!atype.is_char_array()) {
1000 verify_error(ErrorContext::bad_type(bci,
1001 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
1002 bad_type_msg, "castore");
1003 return;
1004 }
1005 no_control_flow = false; break;
1006 case Bytecodes::_sastore :
1007 current_frame.pop_stack(
1008 VerificationType::integer_type(), CHECK_VERIFY(this));
1009 current_frame.pop_stack(
1010 VerificationType::integer_type(), CHECK_VERIFY(this));
1011 atype = current_frame.pop_stack(
1012 VerificationType::reference_check(), CHECK_VERIFY(this));
1013 if (!atype.is_short_array()) {
1014 verify_error(ErrorContext::bad_type(bci,
1015 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1016 bad_type_msg, "sastore");
1017 return;
1018 }
1019 no_control_flow = false; break;
1020 case Bytecodes::_lastore :
1021 current_frame.pop_stack_2(
1022 VerificationType::long2_type(),
1023 VerificationType::long_type(), CHECK_VERIFY(this));
1024 current_frame.pop_stack(
1025 VerificationType::integer_type(), CHECK_VERIFY(this));
1026 atype = current_frame.pop_stack(
1027 VerificationType::reference_check(), CHECK_VERIFY(this));
1028 if (!atype.is_long_array()) {
1029 verify_error(ErrorContext::bad_type(bci,
1030 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1031 bad_type_msg, "lastore");
1032 return;
1033 }
1034 no_control_flow = false; break;
1035 case Bytecodes::_fastore :
1036 current_frame.pop_stack(
1037 VerificationType::float_type(), CHECK_VERIFY(this));
1038 current_frame.pop_stack
1039 (VerificationType::integer_type(), CHECK_VERIFY(this));
1040 atype = current_frame.pop_stack(
1041 VerificationType::reference_check(), CHECK_VERIFY(this));
1042 if (!atype.is_float_array()) {
1043 verify_error(ErrorContext::bad_type(bci,
1044 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1045 bad_type_msg, "fastore");
1046 return;
1047 }
1048 no_control_flow = false; break;
1049 case Bytecodes::_dastore :
1050 current_frame.pop_stack_2(
1051 VerificationType::double2_type(),
1052 VerificationType::double_type(), CHECK_VERIFY(this));
1053 current_frame.pop_stack(
1054 VerificationType::integer_type(), CHECK_VERIFY(this));
1055 atype = current_frame.pop_stack(
1056 VerificationType::reference_check(), CHECK_VERIFY(this));
1057 if (!atype.is_double_array()) {
1058 verify_error(ErrorContext::bad_type(bci,
1059 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1060 bad_type_msg, "dastore");
1061 return;
1062 }
1063 no_control_flow = false; break;
1064 case Bytecodes::_aastore :
1065 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1066 type2 = current_frame.pop_stack(
1067 VerificationType::integer_type(), CHECK_VERIFY(this));
1068 atype = current_frame.pop_stack(
1069 VerificationType::reference_check(), CHECK_VERIFY(this));
1070 // more type-checking is done at runtime
1071 if (!atype.is_reference_array()) {
1072 verify_error(ErrorContext::bad_type(bci,
1073 current_frame.stack_top_ctx(),
1074 TypeOrigin::implicit(VerificationType::reference_check())),
1075 bad_type_msg, "aastore");
1076 return;
1077 }
1078 // 4938384: relaxed constraint in JVMS 3nd edition.
1079 no_control_flow = false; break;
1080 case Bytecodes::_pop :
1081 current_frame.pop_stack(
1082 VerificationType::category1_check(), CHECK_VERIFY(this));
1083 no_control_flow = false; break;
1084 case Bytecodes::_pop2 :
1085 type = current_frame.pop_stack(CHECK_VERIFY(this));
1086 if (type.is_category1()) {
1087 current_frame.pop_stack(
1088 VerificationType::category1_check(), CHECK_VERIFY(this));
1089 } else if (type.is_category2_2nd()) {
1090 current_frame.pop_stack(
1091 VerificationType::category2_check(), CHECK_VERIFY(this));
1092 } else {
1093 /* Unreachable? Would need a category2_1st on TOS
1094 * which does not appear possible. */
1095 verify_error(
1096 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1097 bad_type_msg, "pop2");
1098 return;
1099 }
1100 no_control_flow = false; break;
1101 case Bytecodes::_dup :
1102 type = current_frame.pop_stack(
1103 VerificationType::category1_check(), CHECK_VERIFY(this));
1104 current_frame.push_stack(type, CHECK_VERIFY(this));
1105 current_frame.push_stack(type, CHECK_VERIFY(this));
1106 no_control_flow = false; break;
1107 case Bytecodes::_dup_x1 :
1108 type = current_frame.pop_stack(
1109 VerificationType::category1_check(), CHECK_VERIFY(this));
1110 type2 = current_frame.pop_stack(
1111 VerificationType::category1_check(), CHECK_VERIFY(this));
1112 current_frame.push_stack(type, CHECK_VERIFY(this));
1113 current_frame.push_stack(type2, CHECK_VERIFY(this));
1114 current_frame.push_stack(type, CHECK_VERIFY(this));
1115 no_control_flow = false; break;
1116 case Bytecodes::_dup_x2 :
1117 {
1118 VerificationType type3;
1119 type = current_frame.pop_stack(
1120 VerificationType::category1_check(), CHECK_VERIFY(this));
1121 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1122 if (type2.is_category1()) {
1123 type3 = current_frame.pop_stack(
1124 VerificationType::category1_check(), CHECK_VERIFY(this));
1125 } else if (type2.is_category2_2nd()) {
1126 type3 = current_frame.pop_stack(
1127 VerificationType::category2_check(), CHECK_VERIFY(this));
1128 } else {
1129 /* Unreachable? Would need a category2_1st at stack depth 2 with
1130 * a category1 on TOS which does not appear possible. */
1131 verify_error(ErrorContext::bad_type(
1132 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1133 return;
1134 }
1135 current_frame.push_stack(type, CHECK_VERIFY(this));
1136 current_frame.push_stack(type3, CHECK_VERIFY(this));
1137 current_frame.push_stack(type2, CHECK_VERIFY(this));
1138 current_frame.push_stack(type, CHECK_VERIFY(this));
1139 no_control_flow = false; break;
1140 }
1141 case Bytecodes::_dup2 :
1142 type = current_frame.pop_stack(CHECK_VERIFY(this));
1143 if (type.is_category1()) {
1144 type2 = current_frame.pop_stack(
1145 VerificationType::category1_check(), CHECK_VERIFY(this));
1146 } else if (type.is_category2_2nd()) {
1147 type2 = current_frame.pop_stack(
1148 VerificationType::category2_check(), CHECK_VERIFY(this));
1149 } else {
1150 /* Unreachable? Would need a category2_1st on TOS which does not
1151 * appear possible. */
1152 verify_error(
1153 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1154 bad_type_msg, "dup2");
1155 return;
1156 }
1157 current_frame.push_stack(type2, CHECK_VERIFY(this));
1158 current_frame.push_stack(type, CHECK_VERIFY(this));
1159 current_frame.push_stack(type2, CHECK_VERIFY(this));
1160 current_frame.push_stack(type, CHECK_VERIFY(this));
1161 no_control_flow = false; break;
1162 case Bytecodes::_dup2_x1 :
1163 {
1164 VerificationType type3;
1165 type = current_frame.pop_stack(CHECK_VERIFY(this));
1166 if (type.is_category1()) {
1167 type2 = current_frame.pop_stack(
1168 VerificationType::category1_check(), CHECK_VERIFY(this));
1169 } else if (type.is_category2_2nd()) {
1170 type2 = current_frame.pop_stack(
1171 VerificationType::category2_check(), CHECK_VERIFY(this));
1172 } else {
1173 /* Unreachable? Would need a category2_1st on TOS which does
1174 * not appear possible. */
1175 verify_error(
1176 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1177 bad_type_msg, "dup2_x1");
1178 return;
1179 }
1180 type3 = current_frame.pop_stack(
1181 VerificationType::category1_check(), CHECK_VERIFY(this));
1182 current_frame.push_stack(type2, CHECK_VERIFY(this));
1183 current_frame.push_stack(type, CHECK_VERIFY(this));
1184 current_frame.push_stack(type3, CHECK_VERIFY(this));
1185 current_frame.push_stack(type2, CHECK_VERIFY(this));
1186 current_frame.push_stack(type, CHECK_VERIFY(this));
1187 no_control_flow = false; break;
1188 }
1189 case Bytecodes::_dup2_x2 :
1190 {
1191 VerificationType type3, type4;
1192 type = current_frame.pop_stack(CHECK_VERIFY(this));
1193 if (type.is_category1()) {
1194 type2 = current_frame.pop_stack(
1195 VerificationType::category1_check(), CHECK_VERIFY(this));
1196 } else if (type.is_category2_2nd()) {
1197 type2 = current_frame.pop_stack(
1198 VerificationType::category2_check(), CHECK_VERIFY(this));
1199 } else {
1200 /* Unreachable? Would need a category2_1st on TOS which does
1201 * not appear possible. */
1202 verify_error(
1203 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1204 bad_type_msg, "dup2_x2");
1205 return;
1206 }
1207 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1208 if (type3.is_category1()) {
1209 type4 = current_frame.pop_stack(
1210 VerificationType::category1_check(), CHECK_VERIFY(this));
1211 } else if (type3.is_category2_2nd()) {
1212 type4 = current_frame.pop_stack(
1213 VerificationType::category2_check(), CHECK_VERIFY(this));
1214 } else {
1215 /* Unreachable? Would need a category2_1st on TOS after popping
1216 * a long/double or two category 1's, which does not
1217 * appear possible. */
1218 verify_error(
1219 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1220 bad_type_msg, "dup2_x2");
1221 return;
1222 }
1223 current_frame.push_stack(type2, CHECK_VERIFY(this));
1224 current_frame.push_stack(type, CHECK_VERIFY(this));
1225 current_frame.push_stack(type4, CHECK_VERIFY(this));
1226 current_frame.push_stack(type3, CHECK_VERIFY(this));
1227 current_frame.push_stack(type2, CHECK_VERIFY(this));
1228 current_frame.push_stack(type, CHECK_VERIFY(this));
1229 no_control_flow = false; break;
1230 }
1231 case Bytecodes::_swap :
1232 type = current_frame.pop_stack(
1233 VerificationType::category1_check(), CHECK_VERIFY(this));
1234 type2 = current_frame.pop_stack(
1235 VerificationType::category1_check(), CHECK_VERIFY(this));
1236 current_frame.push_stack(type, CHECK_VERIFY(this));
1237 current_frame.push_stack(type2, CHECK_VERIFY(this));
1238 no_control_flow = false; break;
1239 case Bytecodes::_iadd :
1240 case Bytecodes::_isub :
1241 case Bytecodes::_imul :
1242 case Bytecodes::_idiv :
1243 case Bytecodes::_irem :
1244 case Bytecodes::_ishl :
1245 case Bytecodes::_ishr :
1246 case Bytecodes::_iushr :
1247 case Bytecodes::_ior :
1248 case Bytecodes::_ixor :
1249 case Bytecodes::_iand :
1250 current_frame.pop_stack(
1251 VerificationType::integer_type(), CHECK_VERIFY(this));
1252 // fall through
1253 case Bytecodes::_ineg :
1254 current_frame.pop_stack(
1255 VerificationType::integer_type(), CHECK_VERIFY(this));
1256 current_frame.push_stack(
1257 VerificationType::integer_type(), CHECK_VERIFY(this));
1258 no_control_flow = false; break;
1259 case Bytecodes::_ladd :
1260 case Bytecodes::_lsub :
1261 case Bytecodes::_lmul :
1262 case Bytecodes::_ldiv :
1263 case Bytecodes::_lrem :
1264 case Bytecodes::_land :
1265 case Bytecodes::_lor :
1266 case Bytecodes::_lxor :
1267 current_frame.pop_stack_2(
1268 VerificationType::long2_type(),
1269 VerificationType::long_type(), CHECK_VERIFY(this));
1270 // fall through
1271 case Bytecodes::_lneg :
1272 current_frame.pop_stack_2(
1273 VerificationType::long2_type(),
1274 VerificationType::long_type(), CHECK_VERIFY(this));
1275 current_frame.push_stack_2(
1276 VerificationType::long_type(),
1277 VerificationType::long2_type(), CHECK_VERIFY(this));
1278 no_control_flow = false; break;
1279 case Bytecodes::_lshl :
1280 case Bytecodes::_lshr :
1281 case Bytecodes::_lushr :
1282 current_frame.pop_stack(
1283 VerificationType::integer_type(), CHECK_VERIFY(this));
1284 current_frame.pop_stack_2(
1285 VerificationType::long2_type(),
1286 VerificationType::long_type(), CHECK_VERIFY(this));
1287 current_frame.push_stack_2(
1288 VerificationType::long_type(),
1289 VerificationType::long2_type(), CHECK_VERIFY(this));
1290 no_control_flow = false; break;
1291 case Bytecodes::_fadd :
1292 case Bytecodes::_fsub :
1293 case Bytecodes::_fmul :
1294 case Bytecodes::_fdiv :
1295 case Bytecodes::_frem :
1296 current_frame.pop_stack(
1297 VerificationType::float_type(), CHECK_VERIFY(this));
1298 // fall through
1299 case Bytecodes::_fneg :
1300 current_frame.pop_stack(
1301 VerificationType::float_type(), CHECK_VERIFY(this));
1302 current_frame.push_stack(
1303 VerificationType::float_type(), CHECK_VERIFY(this));
1304 no_control_flow = false; break;
1305 case Bytecodes::_dadd :
1306 case Bytecodes::_dsub :
1307 case Bytecodes::_dmul :
1308 case Bytecodes::_ddiv :
1309 case Bytecodes::_drem :
1310 current_frame.pop_stack_2(
1311 VerificationType::double2_type(),
1312 VerificationType::double_type(), CHECK_VERIFY(this));
1313 // fall through
1314 case Bytecodes::_dneg :
1315 current_frame.pop_stack_2(
1316 VerificationType::double2_type(),
1317 VerificationType::double_type(), CHECK_VERIFY(this));
1318 current_frame.push_stack_2(
1319 VerificationType::double_type(),
1320 VerificationType::double2_type(), CHECK_VERIFY(this));
1321 no_control_flow = false; break;
1322 case Bytecodes::_iinc :
1323 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1324 no_control_flow = false; break;
1325 case Bytecodes::_i2l :
1326 type = current_frame.pop_stack(
1327 VerificationType::integer_type(), CHECK_VERIFY(this));
1328 current_frame.push_stack_2(
1329 VerificationType::long_type(),
1330 VerificationType::long2_type(), CHECK_VERIFY(this));
1331 no_control_flow = false; break;
1332 case Bytecodes::_l2i :
1333 current_frame.pop_stack_2(
1334 VerificationType::long2_type(),
1335 VerificationType::long_type(), CHECK_VERIFY(this));
1336 current_frame.push_stack(
1337 VerificationType::integer_type(), CHECK_VERIFY(this));
1338 no_control_flow = false; break;
1339 case Bytecodes::_i2f :
1340 current_frame.pop_stack(
1341 VerificationType::integer_type(), CHECK_VERIFY(this));
1342 current_frame.push_stack(
1343 VerificationType::float_type(), CHECK_VERIFY(this));
1344 no_control_flow = false; break;
1345 case Bytecodes::_i2d :
1346 current_frame.pop_stack(
1347 VerificationType::integer_type(), CHECK_VERIFY(this));
1348 current_frame.push_stack_2(
1349 VerificationType::double_type(),
1350 VerificationType::double2_type(), CHECK_VERIFY(this));
1351 no_control_flow = false; break;
1352 case Bytecodes::_l2f :
1353 current_frame.pop_stack_2(
1354 VerificationType::long2_type(),
1355 VerificationType::long_type(), CHECK_VERIFY(this));
1356 current_frame.push_stack(
1357 VerificationType::float_type(), CHECK_VERIFY(this));
1358 no_control_flow = false; break;
1359 case Bytecodes::_l2d :
1360 current_frame.pop_stack_2(
1361 VerificationType::long2_type(),
1362 VerificationType::long_type(), CHECK_VERIFY(this));
1363 current_frame.push_stack_2(
1364 VerificationType::double_type(),
1365 VerificationType::double2_type(), CHECK_VERIFY(this));
1366 no_control_flow = false; break;
1367 case Bytecodes::_f2i :
1368 current_frame.pop_stack(
1369 VerificationType::float_type(), CHECK_VERIFY(this));
1370 current_frame.push_stack(
1371 VerificationType::integer_type(), CHECK_VERIFY(this));
1372 no_control_flow = false; break;
1373 case Bytecodes::_f2l :
1374 current_frame.pop_stack(
1375 VerificationType::float_type(), CHECK_VERIFY(this));
1376 current_frame.push_stack_2(
1377 VerificationType::long_type(),
1378 VerificationType::long2_type(), CHECK_VERIFY(this));
1379 no_control_flow = false; break;
1380 case Bytecodes::_f2d :
1381 current_frame.pop_stack(
1382 VerificationType::float_type(), CHECK_VERIFY(this));
1383 current_frame.push_stack_2(
1384 VerificationType::double_type(),
1385 VerificationType::double2_type(), CHECK_VERIFY(this));
1386 no_control_flow = false; break;
1387 case Bytecodes::_d2i :
1388 current_frame.pop_stack_2(
1389 VerificationType::double2_type(),
1390 VerificationType::double_type(), CHECK_VERIFY(this));
1391 current_frame.push_stack(
1392 VerificationType::integer_type(), CHECK_VERIFY(this));
1393 no_control_flow = false; break;
1394 case Bytecodes::_d2l :
1395 current_frame.pop_stack_2(
1396 VerificationType::double2_type(),
1397 VerificationType::double_type(), CHECK_VERIFY(this));
1398 current_frame.push_stack_2(
1399 VerificationType::long_type(),
1400 VerificationType::long2_type(), CHECK_VERIFY(this));
1401 no_control_flow = false; break;
1402 case Bytecodes::_d2f :
1403 current_frame.pop_stack_2(
1404 VerificationType::double2_type(),
1405 VerificationType::double_type(), CHECK_VERIFY(this));
1406 current_frame.push_stack(
1407 VerificationType::float_type(), CHECK_VERIFY(this));
1408 no_control_flow = false; break;
1409 case Bytecodes::_i2b :
1410 case Bytecodes::_i2c :
1411 case Bytecodes::_i2s :
1412 current_frame.pop_stack(
1413 VerificationType::integer_type(), CHECK_VERIFY(this));
1414 current_frame.push_stack(
1415 VerificationType::integer_type(), CHECK_VERIFY(this));
1416 no_control_flow = false; break;
1417 case Bytecodes::_lcmp :
1418 current_frame.pop_stack_2(
1419 VerificationType::long2_type(),
1420 VerificationType::long_type(), CHECK_VERIFY(this));
1421 current_frame.pop_stack_2(
1422 VerificationType::long2_type(),
1423 VerificationType::long_type(), CHECK_VERIFY(this));
1424 current_frame.push_stack(
1425 VerificationType::integer_type(), CHECK_VERIFY(this));
1426 no_control_flow = false; break;
1427 case Bytecodes::_fcmpl :
1428 case Bytecodes::_fcmpg :
1429 current_frame.pop_stack(
1430 VerificationType::float_type(), CHECK_VERIFY(this));
1431 current_frame.pop_stack(
1432 VerificationType::float_type(), CHECK_VERIFY(this));
1433 current_frame.push_stack(
1434 VerificationType::integer_type(), CHECK_VERIFY(this));
1435 no_control_flow = false; break;
1436 case Bytecodes::_dcmpl :
1437 case Bytecodes::_dcmpg :
1438 current_frame.pop_stack_2(
1439 VerificationType::double2_type(),
1440 VerificationType::double_type(), CHECK_VERIFY(this));
1441 current_frame.pop_stack_2(
1442 VerificationType::double2_type(),
1443 VerificationType::double_type(), CHECK_VERIFY(this));
1444 current_frame.push_stack(
1445 VerificationType::integer_type(), CHECK_VERIFY(this));
1446 no_control_flow = false; break;
1447 case Bytecodes::_if_icmpeq:
1448 case Bytecodes::_if_icmpne:
1449 case Bytecodes::_if_icmplt:
1450 case Bytecodes::_if_icmpge:
1451 case Bytecodes::_if_icmpgt:
1452 case Bytecodes::_if_icmple:
1453 current_frame.pop_stack(
1454 VerificationType::integer_type(), CHECK_VERIFY(this));
1455 // fall through
1456 case Bytecodes::_ifeq:
1457 case Bytecodes::_ifne:
1458 case Bytecodes::_iflt:
1459 case Bytecodes::_ifge:
1460 case Bytecodes::_ifgt:
1461 case Bytecodes::_ifle:
1462 current_frame.pop_stack(
1463 VerificationType::integer_type(), CHECK_VERIFY(this));
1464 target = bcs.dest();
1465 stackmap_table.check_jump_target(
1466 ¤t_frame, target, CHECK_VERIFY(this));
1467 no_control_flow = false; break;
1468 case Bytecodes::_if_acmpeq :
1469 case Bytecodes::_if_acmpne :
1470 current_frame.pop_stack(
1471 VerificationType::reference_check(), CHECK_VERIFY(this));
1472 // fall through
1473 case Bytecodes::_ifnull :
1474 case Bytecodes::_ifnonnull :
1475 current_frame.pop_stack(
1476 VerificationType::reference_check(), CHECK_VERIFY(this));
1477 target = bcs.dest();
1478 stackmap_table.check_jump_target
1479 (¤t_frame, target, CHECK_VERIFY(this));
1480 no_control_flow = false; break;
1481 case Bytecodes::_goto :
1482 target = bcs.dest();
1483 stackmap_table.check_jump_target(
1484 ¤t_frame, target, CHECK_VERIFY(this));
1485 no_control_flow = true; break;
1486 case Bytecodes::_goto_w :
1487 target = bcs.dest_w();
1488 stackmap_table.check_jump_target(
1489 ¤t_frame, target, CHECK_VERIFY(this));
1490 no_control_flow = true; break;
1491 case Bytecodes::_tableswitch :
1492 case Bytecodes::_lookupswitch :
1493 verify_switch(
1494 &bcs, code_length, code_data, ¤t_frame,
1495 &stackmap_table, CHECK_VERIFY(this));
1496 no_control_flow = true; break;
1497 case Bytecodes::_ireturn :
1498 type = current_frame.pop_stack(
1499 VerificationType::integer_type(), CHECK_VERIFY(this));
1500 verify_return_value(return_type, type, bci,
1501 ¤t_frame, CHECK_VERIFY(this));
1502 no_control_flow = true; break;
1503 case Bytecodes::_lreturn :
1504 type2 = current_frame.pop_stack(
1505 VerificationType::long2_type(), CHECK_VERIFY(this));
1506 type = current_frame.pop_stack(
1507 VerificationType::long_type(), CHECK_VERIFY(this));
1508 verify_return_value(return_type, type, bci,
1509 ¤t_frame, CHECK_VERIFY(this));
1510 no_control_flow = true; break;
1511 case Bytecodes::_freturn :
1512 type = current_frame.pop_stack(
1513 VerificationType::float_type(), CHECK_VERIFY(this));
1514 verify_return_value(return_type, type, bci,
1515 ¤t_frame, CHECK_VERIFY(this));
1516 no_control_flow = true; break;
1517 case Bytecodes::_dreturn :
1518 type2 = current_frame.pop_stack(
1519 VerificationType::double2_type(), CHECK_VERIFY(this));
1520 type = current_frame.pop_stack(
1521 VerificationType::double_type(), CHECK_VERIFY(this));
1522 verify_return_value(return_type, type, bci,
1523 ¤t_frame, CHECK_VERIFY(this));
1524 no_control_flow = true; break;
1525 case Bytecodes::_areturn :
1526 type = current_frame.pop_stack(
1527 VerificationType::reference_check(), CHECK_VERIFY(this));
1528 verify_return_value(return_type, type, bci,
1529 ¤t_frame, CHECK_VERIFY(this));
1530 no_control_flow = true; break;
1531 case Bytecodes::_return :
1532 if (return_type != VerificationType::bogus_type()) {
1533 verify_error(ErrorContext::bad_code(bci),
1534 "Method expects a return value");
1535 return;
1536 }
1537 // Make sure "this" has been initialized if current method is an
1538 // <init>
1539 if (_method->name() == vmSymbols::object_initializer_name() &&
1540 current_frame.flag_this_uninit()) {
1541 verify_error(ErrorContext::bad_code(bci),
1542 "Constructor must call super() or this() "
1543 "before return");
1544 return;
1545 }
1546 no_control_flow = true; break;
1547 case Bytecodes::_getstatic :
1548 case Bytecodes::_putstatic :
1549 case Bytecodes::_getfield :
1550 case Bytecodes::_putfield :
1551 verify_field_instructions(
1552 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1553 no_control_flow = false; break;
1554 case Bytecodes::_invokevirtual :
1555 case Bytecodes::_invokespecial :
1556 case Bytecodes::_invokestatic :
1557 verify_invoke_instructions(
1558 &bcs, code_length, ¤t_frame,
1559 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1560 no_control_flow = false; break;
1561 case Bytecodes::_invokeinterface :
1562 case Bytecodes::_invokedynamic :
1563 verify_invoke_instructions(
1564 &bcs, code_length, ¤t_frame,
1565 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1566 no_control_flow = false; break;
1567 case Bytecodes::_new :
1568 {
1569 index = bcs.get_index_u2();
1570 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1571 VerificationType new_class_type =
1572 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1573 if (!new_class_type.is_object()) {
1574 verify_error(ErrorContext::bad_type(bci,
1575 TypeOrigin::cp(index, new_class_type)),
1576 "Illegal new instruction");
1577 return;
1578 }
1579 type = VerificationType::uninitialized_type(bci);
1580 current_frame.push_stack(type, CHECK_VERIFY(this));
1581 no_control_flow = false; break;
1582 }
1583 case Bytecodes::_newarray :
1584 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1585 current_frame.pop_stack(
1586 VerificationType::integer_type(), CHECK_VERIFY(this));
1587 current_frame.push_stack(type, CHECK_VERIFY(this));
1588 no_control_flow = false; break;
1589 case Bytecodes::_anewarray :
1590 verify_anewarray(
1591 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1592 no_control_flow = false; break;
1593 case Bytecodes::_arraylength :
1594 type = current_frame.pop_stack(
1595 VerificationType::reference_check(), CHECK_VERIFY(this));
1596 if (!(type.is_null() || type.is_array())) {
1597 verify_error(ErrorContext::bad_type(
1598 bci, current_frame.stack_top_ctx()),
1599 bad_type_msg, "arraylength");
1600 }
1601 current_frame.push_stack(
1602 VerificationType::integer_type(), CHECK_VERIFY(this));
1603 no_control_flow = false; break;
1604 case Bytecodes::_checkcast :
1605 {
1606 index = bcs.get_index_u2();
1607 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1608 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1609 VerificationType klass_type = cp_index_to_type(
1610 index, cp, CHECK_VERIFY(this));
1611 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1612 no_control_flow = false; break;
1613 }
1614 case Bytecodes::_instanceof : {
1615 index = bcs.get_index_u2();
1616 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1617 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1618 current_frame.push_stack(
1619 VerificationType::integer_type(), CHECK_VERIFY(this));
1620 no_control_flow = false; break;
1621 }
1622 case Bytecodes::_monitorenter :
1623 case Bytecodes::_monitorexit :
1624 current_frame.pop_stack(
1625 VerificationType::reference_check(), CHECK_VERIFY(this));
1626 no_control_flow = false; break;
1627 case Bytecodes::_multianewarray :
1628 {
1629 index = bcs.get_index_u2();
1630 u2 dim = *(bcs.bcp()+3);
1631 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1632 VerificationType new_array_type =
1633 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1634 if (!new_array_type.is_array()) {
1635 verify_error(ErrorContext::bad_type(bci,
1636 TypeOrigin::cp(index, new_array_type)),
1637 "Illegal constant pool index in multianewarray instruction");
1638 return;
1639 }
1640 if (dim < 1 || new_array_type.dimensions() < dim) {
1641 verify_error(ErrorContext::bad_code(bci),
1642 "Illegal dimension in multianewarray instruction: %d", dim);
1643 return;
1644 }
1645 for (int i = 0; i < dim; i++) {
1646 current_frame.pop_stack(
1647 VerificationType::integer_type(), CHECK_VERIFY(this));
1648 }
1649 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1650 no_control_flow = false; break;
1651 }
1652 case Bytecodes::_athrow :
1653 type = VerificationType::reference_type(
1654 vmSymbols::java_lang_Throwable());
1655 current_frame.pop_stack(type, CHECK_VERIFY(this));
1656 no_control_flow = true; break;
1657 default:
1658 // We only need to check the valid bytecodes in class file.
1659 // And jsr and ret are not in the new class file format in JDK1.5.
1660 verify_error(ErrorContext::bad_code(bci),
1661 "Bad instruction: %02x", opcode);
1662 no_control_flow = false;
1663 return;
1664 } // end switch
1665 } // end Merge with the next instruction
1667 // Look for possible jump target in exception handlers and see if it
1668 // matches current_frame
1669 if (bci >= ex_min && bci < ex_max) {
1670 verify_exception_handler_targets(
1671 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1672 }
1673 } // end while
1675 // Make sure that control flow does not fall through end of the method
1676 if (!no_control_flow) {
1677 verify_error(ErrorContext::bad_code(code_length),
1678 "Control flow falls through code end");
1679 return;
1680 }
1681 }
1683 #undef bad_type_message
1685 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1686 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1687 memset(code_data, 0, sizeof(char) * code_length);
1688 RawBytecodeStream bcs(m);
1690 while (!bcs.is_last_bytecode()) {
1691 if (bcs.raw_next() != Bytecodes::_illegal) {
1692 int bci = bcs.bci();
1693 if (bcs.raw_code() == Bytecodes::_new) {
1694 code_data[bci] = NEW_OFFSET;
1695 } else {
1696 code_data[bci] = BYTECODE_OFFSET;
1697 }
1698 } else {
1699 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1700 return NULL;
1701 }
1702 }
1704 return code_data;
1705 }
1707 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1708 ExceptionTable exhandlers(_method());
1709 int exlength = exhandlers.length();
1710 constantPoolHandle cp (THREAD, _method->constants());
1712 for(int i = 0; i < exlength; i++) {
1713 //reacquire the table in case a GC happened
1714 ExceptionTable exhandlers(_method());
1715 u2 start_pc = exhandlers.start_pc(i);
1716 u2 end_pc = exhandlers.end_pc(i);
1717 u2 handler_pc = exhandlers.handler_pc(i);
1718 if (start_pc >= code_length || code_data[start_pc] == 0) {
1719 class_format_error("Illegal exception table start_pc %d", start_pc);
1720 return;
1721 }
1722 if (end_pc != code_length) { // special case: end_pc == code_length
1723 if (end_pc > code_length || code_data[end_pc] == 0) {
1724 class_format_error("Illegal exception table end_pc %d", end_pc);
1725 return;
1726 }
1727 }
1728 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1729 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1730 return;
1731 }
1732 int catch_type_index = exhandlers.catch_type_index(i);
1733 if (catch_type_index != 0) {
1734 VerificationType catch_type = cp_index_to_type(
1735 catch_type_index, cp, CHECK_VERIFY(this));
1736 VerificationType throwable =
1737 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1738 bool is_subclass = throwable.is_assignable_from(
1739 catch_type, this, CHECK_VERIFY(this));
1740 if (!is_subclass) {
1741 // 4286534: should throw VerifyError according to recent spec change
1742 verify_error(ErrorContext::bad_type(handler_pc,
1743 TypeOrigin::cp(catch_type_index, catch_type),
1744 TypeOrigin::implicit(throwable)),
1745 "Catch type is not a subclass "
1746 "of Throwable in exception handler %d", handler_pc);
1747 return;
1748 }
1749 }
1750 if (start_pc < min) min = start_pc;
1751 if (end_pc > max) max = end_pc;
1752 }
1753 }
1755 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1756 int localvariable_table_length = _method()->localvariable_table_length();
1757 if (localvariable_table_length > 0) {
1758 LocalVariableTableElement* table = _method()->localvariable_table_start();
1759 for (int i = 0; i < localvariable_table_length; i++) {
1760 u2 start_bci = table[i].start_bci;
1761 u2 length = table[i].length;
1763 if (start_bci >= code_length || code_data[start_bci] == 0) {
1764 class_format_error(
1765 "Illegal local variable table start_pc %d", start_bci);
1766 return;
1767 }
1768 u4 end_bci = (u4)(start_bci + length);
1769 if (end_bci != code_length) {
1770 if (end_bci >= code_length || code_data[end_bci] == 0) {
1771 class_format_error( "Illegal local variable table length %d", length);
1772 return;
1773 }
1774 }
1775 }
1776 }
1777 }
1779 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1780 StackMapFrame* current_frame,
1781 StackMapTable* stackmap_table,
1782 bool no_control_flow, TRAPS) {
1783 if (stackmap_index < stackmap_table->get_frame_count()) {
1784 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1785 if (no_control_flow && this_offset > bci) {
1786 verify_error(ErrorContext::missing_stackmap(bci),
1787 "Expecting a stack map frame");
1788 return 0;
1789 }
1790 if (this_offset == bci) {
1791 ErrorContext ctx;
1792 // See if current stack map can be assigned to the frame in table.
1793 // current_frame is the stackmap frame got from the last instruction.
1794 // If matched, current_frame will be updated by this method.
1795 bool matches = stackmap_table->match_stackmap(
1796 current_frame, this_offset, stackmap_index,
1797 !no_control_flow, true, &ctx, CHECK_VERIFY_(this, 0));
1798 if (!matches) {
1799 // report type error
1800 verify_error(ctx, "Instruction type does not match stack map");
1801 return 0;
1802 }
1803 stackmap_index++;
1804 } else if (this_offset < bci) {
1805 // current_offset should have met this_offset.
1806 class_format_error("Bad stack map offset %d", this_offset);
1807 return 0;
1808 }
1809 } else if (no_control_flow) {
1810 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1811 return 0;
1812 }
1813 return stackmap_index;
1814 }
1816 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1817 StackMapTable* stackmap_table, TRAPS) {
1818 constantPoolHandle cp (THREAD, _method->constants());
1819 ExceptionTable exhandlers(_method());
1820 int exlength = exhandlers.length();
1821 for(int i = 0; i < exlength; i++) {
1822 //reacquire the table in case a GC happened
1823 ExceptionTable exhandlers(_method());
1824 u2 start_pc = exhandlers.start_pc(i);
1825 u2 end_pc = exhandlers.end_pc(i);
1826 u2 handler_pc = exhandlers.handler_pc(i);
1827 int catch_type_index = exhandlers.catch_type_index(i);
1828 if(bci >= start_pc && bci < end_pc) {
1829 u1 flags = current_frame->flags();
1830 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1831 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1832 if (catch_type_index != 0) {
1833 // We know that this index refers to a subclass of Throwable
1834 VerificationType catch_type = cp_index_to_type(
1835 catch_type_index, cp, CHECK_VERIFY(this));
1836 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1837 } else {
1838 VerificationType throwable =
1839 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1840 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1841 }
1842 ErrorContext ctx;
1843 bool matches = stackmap_table->match_stackmap(
1844 new_frame, handler_pc, true, false, &ctx, CHECK_VERIFY(this));
1845 if (!matches) {
1846 verify_error(ctx, "Stack map does not match the one at "
1847 "exception handler %d", handler_pc);
1848 return;
1849 }
1850 }
1851 }
1852 }
1854 void ClassVerifier::verify_cp_index(
1855 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1856 int nconstants = cp->length();
1857 if ((index <= 0) || (index >= nconstants)) {
1858 verify_error(ErrorContext::bad_cp_index(bci, index),
1859 "Illegal constant pool index %d in class %s",
1860 index, cp->pool_holder()->external_name());
1861 return;
1862 }
1863 }
1865 void ClassVerifier::verify_cp_type(
1866 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1868 // In some situations, bytecode rewriting may occur while we're verifying.
1869 // In this case, a constant pool cache exists and some indices refer to that
1870 // instead. Be sure we don't pick up such indices by accident.
1871 // We must check was_recursively_verified() before we get here.
1872 guarantee(cp->cache() == NULL, "not rewritten yet");
1874 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1875 unsigned int tag = cp->tag_at(index).value();
1876 if ((types & (1 << tag)) == 0) {
1877 verify_error(ErrorContext::bad_cp_index(bci, index),
1878 "Illegal type at constant pool entry %d in class %s",
1879 index, cp->pool_holder()->external_name());
1880 return;
1881 }
1882 }
1884 void ClassVerifier::verify_cp_class_type(
1885 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1886 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1887 constantTag tag = cp->tag_at(index);
1888 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1889 verify_error(ErrorContext::bad_cp_index(bci, index),
1890 "Illegal type at constant pool entry %d in class %s",
1891 index, cp->pool_holder()->external_name());
1892 return;
1893 }
1894 }
1896 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1897 stringStream ss;
1899 ctx.reset_frames();
1900 _exception_type = vmSymbols::java_lang_VerifyError();
1901 _error_context = ctx;
1902 va_list va;
1903 va_start(va, msg);
1904 ss.vprint(msg, va);
1905 va_end(va);
1906 _message = ss.as_string();
1907 #ifdef ASSERT
1908 ResourceMark rm;
1909 const char* exception_name = _exception_type->as_C_string();
1910 Exceptions::debug_check_abort(exception_name, NULL);
1911 #endif // ndef ASSERT
1912 }
1914 void ClassVerifier::class_format_error(const char* msg, ...) {
1915 stringStream ss;
1916 _exception_type = vmSymbols::java_lang_ClassFormatError();
1917 va_list va;
1918 va_start(va, msg);
1919 ss.vprint(msg, va);
1920 va_end(va);
1921 if (!_method.is_null()) {
1922 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1923 }
1924 _message = ss.as_string();
1925 }
1927 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1928 // Get current loader and protection domain first.
1929 oop loader = current_class()->class_loader();
1930 oop protection_domain = current_class()->protection_domain();
1932 return SystemDictionary::resolve_or_fail(
1933 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1934 true, CHECK_NULL);
1935 }
1937 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1938 Klass* target_class,
1939 Symbol* field_name,
1940 Symbol* field_sig,
1941 bool is_method) {
1942 No_Safepoint_Verifier nosafepoint;
1944 // If target class isn't a super class of this class, we don't worry about this case
1945 if (!this_class->is_subclass_of(target_class)) {
1946 return false;
1947 }
1948 // Check if the specified method or field is protected
1949 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1950 fieldDescriptor fd;
1951 if (is_method) {
1952 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::normal);
1953 if (m != NULL && m->is_protected()) {
1954 if (!this_class->is_same_class_package(m->method_holder())) {
1955 return true;
1956 }
1957 }
1958 } else {
1959 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1960 if (member_klass != NULL && fd.is_protected()) {
1961 if (!this_class->is_same_class_package(member_klass)) {
1962 return true;
1963 }
1964 }
1965 }
1966 return false;
1967 }
1969 void ClassVerifier::verify_ldc(
1970 int opcode, u2 index, StackMapFrame* current_frame,
1971 constantPoolHandle cp, u2 bci, TRAPS) {
1972 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1973 constantTag tag = cp->tag_at(index);
1974 unsigned int types;
1975 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1976 if (!tag.is_unresolved_klass()) {
1977 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1978 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1979 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1980 // Note: The class file parser already verified the legality of
1981 // MethodHandle and MethodType constants.
1982 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1983 }
1984 } else {
1985 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1986 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1987 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1988 }
1989 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1990 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1991 } else if (tag.is_string()) {
1992 current_frame->push_stack(
1993 VerificationType::reference_type(
1994 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1995 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1996 current_frame->push_stack(
1997 VerificationType::reference_type(
1998 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
1999 } else if (tag.is_int()) {
2000 current_frame->push_stack(
2001 VerificationType::integer_type(), CHECK_VERIFY(this));
2002 } else if (tag.is_float()) {
2003 current_frame->push_stack(
2004 VerificationType::float_type(), CHECK_VERIFY(this));
2005 } else if (tag.is_double()) {
2006 current_frame->push_stack_2(
2007 VerificationType::double_type(),
2008 VerificationType::double2_type(), CHECK_VERIFY(this));
2009 } else if (tag.is_long()) {
2010 current_frame->push_stack_2(
2011 VerificationType::long_type(),
2012 VerificationType::long2_type(), CHECK_VERIFY(this));
2013 } else if (tag.is_method_handle()) {
2014 current_frame->push_stack(
2015 VerificationType::reference_type(
2016 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2017 } else if (tag.is_method_type()) {
2018 current_frame->push_stack(
2019 VerificationType::reference_type(
2020 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2021 } else {
2022 /* Unreachable? verify_cp_type has already validated the cp type. */
2023 verify_error(
2024 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2025 return;
2026 }
2027 }
2029 void ClassVerifier::verify_switch(
2030 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2031 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2032 int bci = bcs->bci();
2033 address bcp = bcs->bcp();
2034 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2036 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2037 // 4639449 & 4647081: padding bytes must be 0
2038 u2 padding_offset = 1;
2039 while ((bcp + padding_offset) < aligned_bcp) {
2040 if(*(bcp + padding_offset) != 0) {
2041 verify_error(ErrorContext::bad_code(bci),
2042 "Nonzero padding byte in lookswitch or tableswitch");
2043 return;
2044 }
2045 padding_offset++;
2046 }
2047 }
2049 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2050 int keys, delta;
2051 current_frame->pop_stack(
2052 VerificationType::integer_type(), CHECK_VERIFY(this));
2053 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2054 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2055 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2056 if (low > high) {
2057 verify_error(ErrorContext::bad_code(bci),
2058 "low must be less than or equal to high in tableswitch");
2059 return;
2060 }
2061 keys = high - low + 1;
2062 if (keys < 0) {
2063 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2064 return;
2065 }
2066 delta = 1;
2067 } else {
2068 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2069 if (keys < 0) {
2070 verify_error(ErrorContext::bad_code(bci),
2071 "number of keys in lookupswitch less than 0");
2072 return;
2073 }
2074 delta = 2;
2075 // Make sure that the lookupswitch items are sorted
2076 for (int i = 0; i < (keys - 1); i++) {
2077 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2078 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2079 if (this_key >= next_key) {
2080 verify_error(ErrorContext::bad_code(bci),
2081 "Bad lookupswitch instruction");
2082 return;
2083 }
2084 }
2085 }
2086 int target = bci + default_offset;
2087 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2088 for (int i = 0; i < keys; i++) {
2089 // Because check_jump_target() may safepoint, the bytecode could have
2090 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2091 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2092 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2093 stackmap_table->check_jump_target(
2094 current_frame, target, CHECK_VERIFY(this));
2095 }
2096 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2097 }
2099 bool ClassVerifier::name_in_supers(
2100 Symbol* ref_name, instanceKlassHandle current) {
2101 Klass* super = current->super();
2102 while (super != NULL) {
2103 if (super->name() == ref_name) {
2104 return true;
2105 }
2106 super = super->super();
2107 }
2108 return false;
2109 }
2111 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2112 StackMapFrame* current_frame,
2113 constantPoolHandle cp,
2114 TRAPS) {
2115 u2 index = bcs->get_index_u2();
2116 verify_cp_type(bcs->bci(), index, cp,
2117 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2119 // Get field name and signature
2120 Symbol* field_name = cp->name_ref_at(index);
2121 Symbol* field_sig = cp->signature_ref_at(index);
2123 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2124 class_format_error(
2125 "Invalid signature for field in class %s referenced "
2126 "from constant pool index %d", _klass->external_name(), index);
2127 return;
2128 }
2130 // Get referenced class type
2131 VerificationType ref_class_type = cp_ref_index_to_type(
2132 index, cp, CHECK_VERIFY(this));
2133 if (!ref_class_type.is_object()) {
2134 /* Unreachable? Class file parser verifies Fieldref contents */
2135 verify_error(ErrorContext::bad_type(bcs->bci(),
2136 TypeOrigin::cp(index, ref_class_type)),
2137 "Expecting reference to class in class %s at constant pool index %d",
2138 _klass->external_name(), index);
2139 return;
2140 }
2141 VerificationType target_class_type = ref_class_type;
2143 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2144 "buffer type must match VerificationType size");
2145 uintptr_t field_type_buffer[2];
2146 VerificationType* field_type = (VerificationType*)field_type_buffer;
2147 // If we make a VerificationType[2] array directly, the compiler calls
2148 // to the c-runtime library to do the allocation instead of just
2149 // stack allocating it. Plus it would run constructors. This shows up
2150 // in performance profiles.
2152 SignatureStream sig_stream(field_sig, false);
2153 VerificationType stack_object_type;
2154 int n = change_sig_to_verificationType(
2155 &sig_stream, field_type, CHECK_VERIFY(this));
2156 u2 bci = bcs->bci();
2157 bool is_assignable;
2158 switch (bcs->raw_code()) {
2159 case Bytecodes::_getstatic: {
2160 for (int i = 0; i < n; i++) {
2161 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2162 }
2163 break;
2164 }
2165 case Bytecodes::_putstatic: {
2166 for (int i = n - 1; i >= 0; i--) {
2167 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2168 }
2169 break;
2170 }
2171 case Bytecodes::_getfield: {
2172 stack_object_type = current_frame->pop_stack(
2173 target_class_type, CHECK_VERIFY(this));
2174 for (int i = 0; i < n; i++) {
2175 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2176 }
2177 goto check_protected;
2178 }
2179 case Bytecodes::_putfield: {
2180 for (int i = n - 1; i >= 0; i--) {
2181 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2182 }
2183 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2185 // The JVMS 2nd edition allows field initialization before the superclass
2186 // initializer, if the field is defined within the current class.
2187 fieldDescriptor fd;
2188 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2189 target_class_type.equals(current_type()) &&
2190 _klass->find_local_field(field_name, field_sig, &fd)) {
2191 stack_object_type = current_type();
2192 }
2193 is_assignable = target_class_type.is_assignable_from(
2194 stack_object_type, this, CHECK_VERIFY(this));
2195 if (!is_assignable) {
2196 verify_error(ErrorContext::bad_type(bci,
2197 current_frame->stack_top_ctx(),
2198 TypeOrigin::cp(index, target_class_type)),
2199 "Bad type on operand stack in putfield");
2200 return;
2201 }
2202 }
2203 check_protected: {
2204 if (_this_type == stack_object_type)
2205 break; // stack_object_type must be assignable to _current_class_type
2206 Symbol* ref_class_name =
2207 cp->klass_name_at(cp->klass_ref_index_at(index));
2208 if (!name_in_supers(ref_class_name, current_class()))
2209 // stack_object_type must be assignable to _current_class_type since:
2210 // 1. stack_object_type must be assignable to ref_class.
2211 // 2. ref_class must be _current_class or a subclass of it. It can't
2212 // be a superclass of it. See revised JVMS 5.4.4.
2213 break;
2215 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2216 if (is_protected_access(current_class(), ref_class_oop, field_name,
2217 field_sig, false)) {
2218 // It's protected access, check if stack object is assignable to
2219 // current class.
2220 is_assignable = current_type().is_assignable_from(
2221 stack_object_type, this, CHECK_VERIFY(this));
2222 if (!is_assignable) {
2223 verify_error(ErrorContext::bad_type(bci,
2224 current_frame->stack_top_ctx(),
2225 TypeOrigin::implicit(current_type())),
2226 "Bad access to protected data in getfield");
2227 return;
2228 }
2229 }
2230 break;
2231 }
2232 default: ShouldNotReachHere();
2233 }
2234 }
2236 void ClassVerifier::verify_invoke_init(
2237 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2238 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2239 constantPoolHandle cp, TRAPS) {
2240 u2 bci = bcs->bci();
2241 VerificationType type = current_frame->pop_stack(
2242 VerificationType::reference_check(), CHECK_VERIFY(this));
2243 if (type == VerificationType::uninitialized_this_type()) {
2244 // The method must be an <init> method of this class or its superclass
2245 Klass* superk = current_class()->super();
2246 if (ref_class_type.name() != current_class()->name() &&
2247 ref_class_type.name() != superk->name()) {
2248 verify_error(ErrorContext::bad_type(bci,
2249 TypeOrigin::implicit(ref_class_type),
2250 TypeOrigin::implicit(current_type())),
2251 "Bad <init> method call");
2252 return;
2253 }
2255 // Make sure that this call is not jumped over.
2256 if (bci < furthest_jump()) {
2257 verify_error(ErrorContext::bad_code(bci),
2258 "Bad <init> method call from inside of a branch");
2259 return;
2260 }
2262 // Make sure that this call is not done from within a TRY block because
2263 // that can result in returning an incomplete object. Simply checking
2264 // (bci >= start_pc) also ensures that this call is not done after a TRY
2265 // block. That is also illegal because this call must be the first Java
2266 // statement in the constructor.
2267 ExceptionTable exhandlers(_method());
2268 int exlength = exhandlers.length();
2269 for(int i = 0; i < exlength; i++) {
2270 if (bci >= exhandlers.start_pc(i)) {
2271 verify_error(ErrorContext::bad_code(bci),
2272 "Bad <init> method call from after the start of a try block");
2273 return;
2274 }
2275 }
2277 current_frame->initialize_object(type, current_type());
2278 *this_uninit = true;
2279 } else if (type.is_uninitialized()) {
2280 u2 new_offset = type.bci();
2281 address new_bcp = bcs->bcp() - bci + new_offset;
2282 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2283 /* Unreachable? Stack map parsing ensures valid type and new
2284 * instructions have a valid BCI. */
2285 verify_error(ErrorContext::bad_code(new_offset),
2286 "Expecting new instruction");
2287 return;
2288 }
2289 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2290 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2292 // The method must be an <init> method of the indicated class
2293 VerificationType new_class_type = cp_index_to_type(
2294 new_class_index, cp, CHECK_VERIFY(this));
2295 if (!new_class_type.equals(ref_class_type)) {
2296 verify_error(ErrorContext::bad_type(bci,
2297 TypeOrigin::cp(new_class_index, new_class_type),
2298 TypeOrigin::cp(ref_class_index, ref_class_type)),
2299 "Call to wrong <init> method");
2300 return;
2301 }
2302 // According to the VM spec, if the referent class is a superclass of the
2303 // current class, and is in a different runtime package, and the method is
2304 // protected, then the objectref must be the current class or a subclass
2305 // of the current class.
2306 VerificationType objectref_type = new_class_type;
2307 if (name_in_supers(ref_class_type.name(), current_class())) {
2308 Klass* ref_klass = load_class(
2309 ref_class_type.name(), CHECK_VERIFY(this));
2310 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2311 vmSymbols::object_initializer_name(),
2312 cp->signature_ref_at(bcs->get_index_u2()), Klass::normal);
2313 if (m == NULL) {
2314 verify_error(ErrorContext::bad_code(bci),
2315 "Call to missing <init> method");
2316 return;
2317 }
2318 instanceKlassHandle mh(THREAD, m->method_holder());
2319 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2320 bool assignable = current_type().is_assignable_from(
2321 objectref_type, this, CHECK_VERIFY(this));
2322 if (!assignable) {
2323 verify_error(ErrorContext::bad_type(bci,
2324 TypeOrigin::cp(new_class_index, objectref_type),
2325 TypeOrigin::implicit(current_type())),
2326 "Bad access to protected <init> method");
2327 return;
2328 }
2329 }
2330 }
2331 current_frame->initialize_object(type, new_class_type);
2332 } else {
2333 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2334 "Bad operand type when invoking <init>");
2335 return;
2336 }
2337 }
2339 bool ClassVerifier::is_same_or_direct_interface(
2340 instanceKlassHandle klass,
2341 VerificationType klass_type,
2342 VerificationType ref_class_type) {
2343 if (ref_class_type.equals(klass_type)) return true;
2344 Array<Klass*>* local_interfaces = klass->local_interfaces();
2345 if (local_interfaces != NULL) {
2346 for (int x = 0; x < local_interfaces->length(); x++) {
2347 Klass* k = local_interfaces->at(x);
2348 assert (k != NULL && k->is_interface(), "invalid interface");
2349 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2350 return true;
2351 }
2352 }
2353 }
2354 return false;
2355 }
2357 void ClassVerifier::verify_invoke_instructions(
2358 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2359 bool *this_uninit, VerificationType return_type,
2360 constantPoolHandle cp, TRAPS) {
2361 // Make sure the constant pool item is the right type
2362 u2 index = bcs->get_index_u2();
2363 Bytecodes::Code opcode = bcs->raw_code();
2364 unsigned int types;
2365 switch (opcode) {
2366 case Bytecodes::_invokeinterface:
2367 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2368 break;
2369 case Bytecodes::_invokedynamic:
2370 types = 1 << JVM_CONSTANT_InvokeDynamic;
2371 break;
2372 case Bytecodes::_invokespecial:
2373 case Bytecodes::_invokestatic:
2374 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2375 (1 << JVM_CONSTANT_Methodref) :
2376 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2377 break;
2378 default:
2379 types = 1 << JVM_CONSTANT_Methodref;
2380 }
2381 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2383 // Get method name and signature
2384 Symbol* method_name = cp->name_ref_at(index);
2385 Symbol* method_sig = cp->signature_ref_at(index);
2387 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2388 class_format_error(
2389 "Invalid method signature in class %s referenced "
2390 "from constant pool index %d", _klass->external_name(), index);
2391 return;
2392 }
2394 // Get referenced class type
2395 VerificationType ref_class_type;
2396 if (opcode == Bytecodes::_invokedynamic) {
2397 if (!EnableInvokeDynamic ||
2398 _klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2399 if (!EnableInvokeDynamic) {
2400 class_format_error("invokedynamic instructions not enabled in this JVM");
2401 } else {
2402 class_format_error("invokedynamic instructions not supported by this class file version (%d), class %s",
2403 _klass->major_version(), _klass->external_name());
2404 }
2405 return;
2406 }
2407 } else {
2408 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2409 }
2411 // For a small signature length, we just allocate 128 bytes instead
2412 // of parsing the signature once to find its size.
2413 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2414 // longs/doubles to be consertive.
2415 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2416 "buffer type must match VerificationType size");
2417 uintptr_t on_stack_sig_types_buffer[128];
2418 // If we make a VerificationType[128] array directly, the compiler calls
2419 // to the c-runtime library to do the allocation instead of just
2420 // stack allocating it. Plus it would run constructors. This shows up
2421 // in performance profiles.
2423 VerificationType* sig_types;
2424 int size = (method_sig->utf8_length() - 3) * 2;
2425 if (size > 128) {
2426 // Long and double occupies two slots here.
2427 ArgumentSizeComputer size_it(method_sig);
2428 size = size_it.size();
2429 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2430 } else{
2431 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2432 }
2433 SignatureStream sig_stream(method_sig);
2434 int sig_i = 0;
2435 while (!sig_stream.at_return_type()) {
2436 sig_i += change_sig_to_verificationType(
2437 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2438 sig_stream.next();
2439 }
2440 int nargs = sig_i;
2442 #ifdef ASSERT
2443 {
2444 ArgumentSizeComputer size_it(method_sig);
2445 assert(nargs == size_it.size(), "Argument sizes do not match");
2446 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2447 }
2448 #endif
2450 // Check instruction operands
2451 u2 bci = bcs->bci();
2452 if (opcode == Bytecodes::_invokeinterface) {
2453 address bcp = bcs->bcp();
2454 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2455 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2456 // the difference between the size of the operand stack before and after the instruction
2457 // executes.
2458 if (*(bcp+3) != (nargs+1)) {
2459 verify_error(ErrorContext::bad_code(bci),
2460 "Inconsistent args count operand in invokeinterface");
2461 return;
2462 }
2463 if (*(bcp+4) != 0) {
2464 verify_error(ErrorContext::bad_code(bci),
2465 "Fourth operand byte of invokeinterface must be zero");
2466 return;
2467 }
2468 }
2470 if (opcode == Bytecodes::_invokedynamic) {
2471 address bcp = bcs->bcp();
2472 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2473 verify_error(ErrorContext::bad_code(bci),
2474 "Third and fourth operand bytes of invokedynamic must be zero");
2475 return;
2476 }
2477 }
2479 if (method_name->byte_at(0) == '<') {
2480 // Make sure <init> can only be invoked by invokespecial
2481 if (opcode != Bytecodes::_invokespecial ||
2482 method_name != vmSymbols::object_initializer_name()) {
2483 verify_error(ErrorContext::bad_code(bci),
2484 "Illegal call to internal method");
2485 return;
2486 }
2487 } else if (opcode == Bytecodes::_invokespecial
2488 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2489 && !ref_class_type.equals(VerificationType::reference_type(
2490 current_class()->super()->name()))) {
2491 bool subtype = false;
2492 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2493 if (!current_class()->is_anonymous()) {
2494 subtype = ref_class_type.is_assignable_from(
2495 current_type(), this, CHECK_VERIFY(this));
2496 } else {
2497 VerificationType host_klass_type =
2498 VerificationType::reference_type(current_class()->host_klass()->name());
2499 subtype = ref_class_type.is_assignable_from(host_klass_type, this, CHECK_VERIFY(this));
2501 // If invokespecial of IMR, need to recheck for same or
2502 // direct interface relative to the host class
2503 have_imr_indirect = (have_imr_indirect &&
2504 !is_same_or_direct_interface(
2505 InstanceKlass::cast(current_class()->host_klass()),
2506 host_klass_type, ref_class_type));
2507 }
2508 if (!subtype) {
2509 verify_error(ErrorContext::bad_code(bci),
2510 "Bad invokespecial instruction: "
2511 "current class isn't assignable to reference class.");
2512 return;
2513 } else if (have_imr_indirect) {
2514 verify_error(ErrorContext::bad_code(bci),
2515 "Bad invokespecial instruction: "
2516 "interface method reference is in an indirect superinterface.");
2517 return;
2518 }
2520 }
2521 // Match method descriptor with operand stack
2522 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2523 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2524 }
2525 // Check objectref on operand stack
2526 if (opcode != Bytecodes::_invokestatic &&
2527 opcode != Bytecodes::_invokedynamic) {
2528 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2529 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2530 code_length, this_uninit, cp, CHECK_VERIFY(this));
2531 } else { // other methods
2532 // Ensures that target class is assignable to method class.
2533 if (opcode == Bytecodes::_invokespecial) {
2534 if (!current_class()->is_anonymous()) {
2535 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2536 } else {
2537 // anonymous class invokespecial calls: check if the
2538 // objectref is a subtype of the host_klass of the current class
2539 // to allow an anonymous class to reference methods in the host_klass
2540 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2541 VerificationType hosttype =
2542 VerificationType::reference_type(current_class()->host_klass()->name());
2543 bool subtype = hosttype.is_assignable_from(top, this, CHECK_VERIFY(this));
2544 if (!subtype) {
2545 verify_error( ErrorContext::bad_type(current_frame->offset(),
2546 current_frame->stack_top_ctx(),
2547 TypeOrigin::implicit(top)),
2548 "Bad type on operand stack");
2549 return;
2550 }
2551 }
2552 } else if (opcode == Bytecodes::_invokevirtual) {
2553 VerificationType stack_object_type =
2554 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2555 if (current_type() != stack_object_type) {
2556 assert(cp->cache() == NULL, "not rewritten yet");
2557 Symbol* ref_class_name =
2558 cp->klass_name_at(cp->klass_ref_index_at(index));
2559 // See the comments in verify_field_instructions() for
2560 // the rationale behind this.
2561 if (name_in_supers(ref_class_name, current_class())) {
2562 Klass* ref_class = load_class(ref_class_name, CHECK);
2563 if (is_protected_access(
2564 _klass, ref_class, method_name, method_sig, true)) {
2565 // It's protected access, check if stack object is
2566 // assignable to current class.
2567 bool is_assignable = current_type().is_assignable_from(
2568 stack_object_type, this, CHECK_VERIFY(this));
2569 if (!is_assignable) {
2570 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2571 && stack_object_type.is_array()
2572 && method_name == vmSymbols::clone_name()) {
2573 // Special case: arrays pretend to implement public Object
2574 // clone().
2575 } else {
2576 verify_error(ErrorContext::bad_type(bci,
2577 current_frame->stack_top_ctx(),
2578 TypeOrigin::implicit(current_type())),
2579 "Bad access to protected data in invokevirtual");
2580 return;
2581 }
2582 }
2583 }
2584 }
2585 }
2586 } else {
2587 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2588 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2589 }
2590 }
2591 }
2592 // Push the result type.
2593 if (sig_stream.type() != T_VOID) {
2594 if (method_name == vmSymbols::object_initializer_name()) {
2595 // <init> method must have a void return type
2596 /* Unreachable? Class file parser verifies that methods with '<' have
2597 * void return */
2598 verify_error(ErrorContext::bad_code(bci),
2599 "Return type must be void in <init> method");
2600 return;
2601 }
2602 VerificationType return_type[2];
2603 int n = change_sig_to_verificationType(
2604 &sig_stream, return_type, CHECK_VERIFY(this));
2605 for (int i = 0; i < n; i++) {
2606 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2607 }
2608 }
2609 }
2611 VerificationType ClassVerifier::get_newarray_type(
2612 u2 index, u2 bci, TRAPS) {
2613 const char* from_bt[] = {
2614 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2615 };
2616 if (index < T_BOOLEAN || index > T_LONG) {
2617 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2618 return VerificationType::bogus_type();
2619 }
2621 // from_bt[index] contains the array signature which has a length of 2
2622 Symbol* sig = create_temporary_symbol(
2623 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2624 return VerificationType::reference_type(sig);
2625 }
2627 void ClassVerifier::verify_anewarray(
2628 u2 bci, u2 index, constantPoolHandle cp,
2629 StackMapFrame* current_frame, TRAPS) {
2630 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2631 current_frame->pop_stack(
2632 VerificationType::integer_type(), CHECK_VERIFY(this));
2634 VerificationType component_type =
2635 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2636 int length;
2637 char* arr_sig_str;
2638 if (component_type.is_array()) { // it's an array
2639 const char* component_name = component_type.name()->as_utf8();
2640 // add one dimension to component
2641 length = (int)strlen(component_name) + 1;
2642 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2643 arr_sig_str[0] = '[';
2644 strncpy(&arr_sig_str[1], component_name, length - 1);
2645 } else { // it's an object or interface
2646 const char* component_name = component_type.name()->as_utf8();
2647 // add one dimension to component with 'L' prepended and ';' postpended.
2648 length = (int)strlen(component_name) + 3;
2649 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2650 arr_sig_str[0] = '[';
2651 arr_sig_str[1] = 'L';
2652 strncpy(&arr_sig_str[2], component_name, length - 2);
2653 arr_sig_str[length - 1] = ';';
2654 }
2655 Symbol* arr_sig = create_temporary_symbol(
2656 arr_sig_str, length, CHECK_VERIFY(this));
2657 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2658 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2659 }
2661 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2662 current_frame->get_local(
2663 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2664 current_frame->push_stack(
2665 VerificationType::integer_type(), CHECK_VERIFY(this));
2666 }
2668 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2669 current_frame->get_local_2(
2670 index, VerificationType::long_type(),
2671 VerificationType::long2_type(), CHECK_VERIFY(this));
2672 current_frame->push_stack_2(
2673 VerificationType::long_type(),
2674 VerificationType::long2_type(), CHECK_VERIFY(this));
2675 }
2677 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2678 current_frame->get_local(
2679 index, VerificationType::float_type(), CHECK_VERIFY(this));
2680 current_frame->push_stack(
2681 VerificationType::float_type(), CHECK_VERIFY(this));
2682 }
2684 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2685 current_frame->get_local_2(
2686 index, VerificationType::double_type(),
2687 VerificationType::double2_type(), CHECK_VERIFY(this));
2688 current_frame->push_stack_2(
2689 VerificationType::double_type(),
2690 VerificationType::double2_type(), CHECK_VERIFY(this));
2691 }
2693 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2694 VerificationType type = current_frame->get_local(
2695 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2696 current_frame->push_stack(type, CHECK_VERIFY(this));
2697 }
2699 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2700 current_frame->pop_stack(
2701 VerificationType::integer_type(), CHECK_VERIFY(this));
2702 current_frame->set_local(
2703 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2704 }
2706 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2707 current_frame->pop_stack_2(
2708 VerificationType::long2_type(),
2709 VerificationType::long_type(), CHECK_VERIFY(this));
2710 current_frame->set_local_2(
2711 index, VerificationType::long_type(),
2712 VerificationType::long2_type(), CHECK_VERIFY(this));
2713 }
2715 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2716 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2717 current_frame->set_local(
2718 index, VerificationType::float_type(), CHECK_VERIFY(this));
2719 }
2721 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2722 current_frame->pop_stack_2(
2723 VerificationType::double2_type(),
2724 VerificationType::double_type(), CHECK_VERIFY(this));
2725 current_frame->set_local_2(
2726 index, VerificationType::double_type(),
2727 VerificationType::double2_type(), CHECK_VERIFY(this));
2728 }
2730 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2731 VerificationType type = current_frame->pop_stack(
2732 VerificationType::reference_check(), CHECK_VERIFY(this));
2733 current_frame->set_local(index, type, CHECK_VERIFY(this));
2734 }
2736 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2737 VerificationType type = current_frame->get_local(
2738 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2739 current_frame->set_local(index, type, CHECK_VERIFY(this));
2740 }
2742 void ClassVerifier::verify_return_value(
2743 VerificationType return_type, VerificationType type, u2 bci,
2744 StackMapFrame* current_frame, TRAPS) {
2745 if (return_type == VerificationType::bogus_type()) {
2746 verify_error(ErrorContext::bad_type(bci,
2747 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2748 "Method expects a return value");
2749 return;
2750 }
2751 bool match = return_type.is_assignable_from(type, this, CHECK_VERIFY(this));
2752 if (!match) {
2753 verify_error(ErrorContext::bad_type(bci,
2754 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2755 "Bad return type");
2756 return;
2757 }
2758 }
2760 // The verifier creates symbols which are substrings of Symbols.
2761 // These are stored in the verifier until the end of verification so that
2762 // they can be reference counted.
2763 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2764 int end, TRAPS) {
2765 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2766 _symbols->push(sym);
2767 return sym;
2768 }
2770 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2771 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2772 _symbols->push(sym);
2773 return sym;
2774 }
