Fri, 06 Mar 2015 16:47:46 +0100
8074561: Wrong volatile qualifier for field ClassLoaderDataGraphKlassIteratorAtomic::_next_klass
Reviewed-by: mgerdin, stefank
1 /*
2 * Copyright (c) 1998, 2015, 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.
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23 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/stackMapTable.hpp"
29 #include "classfile/stackMapFrame.hpp"
30 #include "classfile/stackMapTableFormat.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/verifier.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/bytecodes.hpp"
35 #include "interpreter/bytecodeStream.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "oops/typeArrayOop.hpp"
41 #include "prims/jvm.h"
42 #include "runtime/fieldDescriptor.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/orderAccess.inline.hpp"
47 #include "runtime/os.hpp"
48 #ifdef TARGET_ARCH_x86
49 # include "bytes_x86.hpp"
50 #endif
51 #ifdef TARGET_ARCH_sparc
52 # include "bytes_sparc.hpp"
53 #endif
54 #ifdef TARGET_ARCH_zero
55 # include "bytes_zero.hpp"
56 #endif
57 #ifdef TARGET_ARCH_arm
58 # include "bytes_arm.hpp"
59 #endif
60 #ifdef TARGET_ARCH_ppc
61 # include "bytes_ppc.hpp"
62 #endif
64 #define NOFAILOVER_MAJOR_VERSION 51
65 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
66 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
68 // Access to external entry for VerifyClassCodes - old byte code verifier
70 extern "C" {
71 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
72 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
73 }
75 static void* volatile _verify_byte_codes_fn = NULL;
77 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
79 static void* verify_byte_codes_fn() {
80 if (_verify_byte_codes_fn == NULL) {
81 void *lib_handle = os::native_java_library();
82 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
83 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
84 if (func == NULL) {
85 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
86 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
87 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
88 }
89 }
90 return (void*)_verify_byte_codes_fn;
91 }
94 // Methods in Verifier
96 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
97 return (class_loader == NULL || !should_verify_class) ?
98 BytecodeVerificationLocal : BytecodeVerificationRemote;
99 }
101 bool Verifier::relax_verify_for(oop loader) {
102 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
103 bool need_verify =
104 // verifyAll
105 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
106 // verifyRemote
107 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
108 return !need_verify;
109 }
111 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
112 HandleMark hm;
113 ResourceMark rm(THREAD);
115 Symbol* exception_name = NULL;
116 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
117 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
118 char* exception_message = message_buffer;
120 const char* klassName = klass->external_name();
121 bool can_failover = FailOverToOldVerifier &&
122 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
124 // If the class should be verified, first see if we can use the split
125 // verifier. If not, or if verification fails and FailOverToOldVerifier
126 // is set, then call the inference verifier.
127 if (is_eligible_for_verification(klass, should_verify_class)) {
128 if (TraceClassInitialization) {
129 tty->print_cr("Start class verification for: %s", klassName);
130 }
131 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
132 ClassVerifier split_verifier(klass, THREAD);
133 split_verifier.verify_class(THREAD);
134 exception_name = split_verifier.result();
135 if (can_failover && !HAS_PENDING_EXCEPTION &&
136 (exception_name == vmSymbols::java_lang_VerifyError() ||
137 exception_name == vmSymbols::java_lang_ClassFormatError())) {
138 if (TraceClassInitialization || VerboseVerification) {
139 tty->print_cr(
140 "Fail over class verification to old verifier for: %s", klassName);
141 }
142 exception_name = inference_verify(
143 klass, message_buffer, message_buffer_len, THREAD);
144 }
145 if (exception_name != NULL) {
146 exception_message = split_verifier.exception_message();
147 }
148 } else {
149 exception_name = inference_verify(
150 klass, message_buffer, message_buffer_len, THREAD);
151 }
153 if (TraceClassInitialization || VerboseVerification) {
154 if (HAS_PENDING_EXCEPTION) {
155 tty->print("Verification for %s has", klassName);
156 tty->print_cr(" exception pending %s ",
157 InstanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
158 } else if (exception_name != NULL) {
159 tty->print_cr("Verification for %s failed", klassName);
160 }
161 tty->print_cr("End class verification for: %s", klassName);
162 }
163 }
165 if (HAS_PENDING_EXCEPTION) {
166 return false; // use the existing exception
167 } else if (exception_name == NULL) {
168 return true; // verifcation succeeded
169 } else { // VerifyError or ClassFormatError to be created and thrown
170 ResourceMark rm(THREAD);
171 instanceKlassHandle kls =
172 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
173 while (!kls.is_null()) {
174 if (kls == klass) {
175 // If the class being verified is the exception we're creating
176 // or one of it's superclasses, we're in trouble and are going
177 // to infinitely recurse when we try to initialize the exception.
178 // So bail out here by throwing the preallocated VM error.
179 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
180 }
181 kls = kls->super();
182 }
183 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
184 THROW_MSG_(exception_name, exception_message, false);
185 }
186 }
188 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
189 Symbol* name = klass->name();
190 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
192 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
194 return (should_verify_for(klass->class_loader(), should_verify_class) &&
195 // return if the class is a bootstrapping class
196 // or defineClass specified not to verify by default (flags override passed arg)
197 // We need to skip the following four for bootstraping
198 name != vmSymbols::java_lang_Object() &&
199 name != vmSymbols::java_lang_Class() &&
200 name != vmSymbols::java_lang_String() &&
201 name != vmSymbols::java_lang_Throwable() &&
203 // Can not verify the bytecodes for shared classes because they have
204 // already been rewritten to contain constant pool cache indices,
205 // which the verifier can't understand.
206 // Shared classes shouldn't have stackmaps either.
207 !klass()->is_shared() &&
209 // As of the fix for 4486457 we disable verification for all of the
210 // dynamically-generated bytecodes associated with the 1.4
211 // reflection implementation, not just those associated with
212 // sun/reflect/SerializationConstructorAccessor.
213 // NOTE: this is called too early in the bootstrapping process to be
214 // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.
215 // Also for lambda generated code, gte jdk8
216 (!is_reflect || VerifyReflectionBytecodes));
217 }
219 Symbol* Verifier::inference_verify(
220 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
221 JavaThread* thread = (JavaThread*)THREAD;
222 JNIEnv *env = thread->jni_environment();
224 void* verify_func = verify_byte_codes_fn();
226 if (verify_func == NULL) {
227 jio_snprintf(message, message_len, "Could not link verifier");
228 return vmSymbols::java_lang_VerifyError();
229 }
231 ResourceMark rm(THREAD);
232 if (VerboseVerification) {
233 tty->print_cr("Verifying class %s with old format", klass->external_name());
234 }
236 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
237 jint result;
239 {
240 HandleMark hm(thread);
241 ThreadToNativeFromVM ttn(thread);
242 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
243 // code knows that we have left the VM
245 if (_is_new_verify_byte_codes_fn) {
246 verify_byte_codes_fn_new_t func =
247 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
248 result = (*func)(env, cls, message, (int)message_len,
249 klass->major_version());
250 } else {
251 verify_byte_codes_fn_t func =
252 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
253 result = (*func)(env, cls, message, (int)message_len);
254 }
255 }
257 JNIHandles::destroy_local(cls);
259 // These numbers are chosen so that VerifyClassCodes interface doesn't need
260 // to be changed (still return jboolean (unsigned char)), and result is
261 // 1 when verification is passed.
262 if (result == 0) {
263 return vmSymbols::java_lang_VerifyError();
264 } else if (result == 1) {
265 return NULL; // verified.
266 } else if (result == 2) {
267 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
268 } else if (result == 3) {
269 return vmSymbols::java_lang_ClassFormatError();
270 } else {
271 ShouldNotReachHere();
272 return NULL;
273 }
274 }
276 TypeOrigin TypeOrigin::null() {
277 return TypeOrigin();
278 }
279 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
280 assert(frame != NULL, "Must have a frame");
281 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
282 frame->local_at(index));
283 }
284 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
285 assert(frame != NULL, "Must have a frame");
286 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
287 frame->stack_at(index));
288 }
289 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
290 assert(frame != NULL, "Must have a frame");
291 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
292 frame->local_at(index));
293 }
294 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
295 assert(frame != NULL, "Must have a frame");
296 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
297 frame->stack_at(index));
298 }
299 TypeOrigin TypeOrigin::bad_index(u2 index) {
300 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
301 }
302 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
303 return TypeOrigin(CONST_POOL, index, NULL, vt);
304 }
305 TypeOrigin TypeOrigin::signature(VerificationType vt) {
306 return TypeOrigin(SIG, 0, NULL, vt);
307 }
308 TypeOrigin TypeOrigin::implicit(VerificationType t) {
309 return TypeOrigin(IMPLICIT, 0, NULL, t);
310 }
311 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
312 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
313 VerificationType::bogus_type());
314 }
316 void TypeOrigin::reset_frame() {
317 if (_frame != NULL) {
318 _frame->restore();
319 }
320 }
322 void TypeOrigin::details(outputStream* ss) const {
323 _type.print_on(ss);
324 switch (_origin) {
325 case CF_LOCALS:
326 ss->print(" (current frame, locals[%d])", _index);
327 break;
328 case CF_STACK:
329 ss->print(" (current frame, stack[%d])", _index);
330 break;
331 case SM_LOCALS:
332 ss->print(" (stack map, locals[%d])", _index);
333 break;
334 case SM_STACK:
335 ss->print(" (stack map, stack[%d])", _index);
336 break;
337 case CONST_POOL:
338 ss->print(" (constant pool %d)", _index);
339 break;
340 case SIG:
341 ss->print(" (from method signature)");
342 break;
343 case IMPLICIT:
344 case FRAME_ONLY:
345 case NONE:
346 default:
347 ;
348 }
349 }
351 #ifdef ASSERT
352 void TypeOrigin::print_on(outputStream* str) const {
353 str->print("{%d,%d,%p:", _origin, _index, _frame);
354 if (_frame != NULL) {
355 _frame->print_on(str);
356 } else {
357 str->print("null");
358 }
359 str->print(",");
360 _type.print_on(str);
361 str->print("}");
362 }
363 #endif
365 void ErrorContext::details(outputStream* ss, const Method* method) const {
366 if (is_valid()) {
367 ss->cr();
368 ss->print_cr("Exception Details:");
369 location_details(ss, method);
370 reason_details(ss);
371 frame_details(ss);
372 bytecode_details(ss, method);
373 handler_details(ss, method);
374 stackmap_details(ss, method);
375 }
376 }
378 void ErrorContext::reason_details(outputStream* ss) const {
379 streamIndentor si(ss);
380 ss->indent().print_cr("Reason:");
381 streamIndentor si2(ss);
382 ss->indent().print("%s", "");
383 switch (_fault) {
384 case INVALID_BYTECODE:
385 ss->print("Error exists in the bytecode");
386 break;
387 case WRONG_TYPE:
388 if (_expected.is_valid()) {
389 ss->print("Type ");
390 _type.details(ss);
391 ss->print(" is not assignable to ");
392 _expected.details(ss);
393 } else {
394 ss->print("Invalid type: ");
395 _type.details(ss);
396 }
397 break;
398 case FLAGS_MISMATCH:
399 if (_expected.is_valid()) {
400 ss->print("Current frame's flags are not assignable "
401 "to stack map frame's.");
402 } else {
403 ss->print("Current frame's flags are invalid in this context.");
404 }
405 break;
406 case BAD_CP_INDEX:
407 ss->print("Constant pool index %d is invalid", _type.index());
408 break;
409 case BAD_LOCAL_INDEX:
410 ss->print("Local index %d is invalid", _type.index());
411 break;
412 case LOCALS_SIZE_MISMATCH:
413 ss->print("Current frame's local size doesn't match stackmap.");
414 break;
415 case STACK_SIZE_MISMATCH:
416 ss->print("Current frame's stack size doesn't match stackmap.");
417 break;
418 case STACK_OVERFLOW:
419 ss->print("Exceeded max stack size.");
420 break;
421 case STACK_UNDERFLOW:
422 ss->print("Attempt to pop empty stack.");
423 break;
424 case MISSING_STACKMAP:
425 ss->print("Expected stackmap frame at this location.");
426 break;
427 case BAD_STACKMAP:
428 ss->print("Invalid stackmap specification.");
429 break;
430 case UNKNOWN:
431 default:
432 ShouldNotReachHere();
433 ss->print_cr("Unknown");
434 }
435 ss->cr();
436 }
438 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
439 if (_bci != -1 && method != NULL) {
440 streamIndentor si(ss);
441 const char* bytecode_name = "<invalid>";
442 if (method->validate_bci_from_bcx(_bci) != -1) {
443 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
444 if (Bytecodes::is_defined(code)) {
445 bytecode_name = Bytecodes::name(code);
446 } else {
447 bytecode_name = "<illegal>";
448 }
449 }
450 InstanceKlass* ik = method->method_holder();
451 ss->indent().print_cr("Location:");
452 streamIndentor si2(ss);
453 ss->indent().print_cr("%s.%s%s @%d: %s",
454 ik->name()->as_C_string(), method->name()->as_C_string(),
455 method->signature()->as_C_string(), _bci, bytecode_name);
456 }
457 }
459 void ErrorContext::frame_details(outputStream* ss) const {
460 streamIndentor si(ss);
461 if (_type.is_valid() && _type.frame() != NULL) {
462 ss->indent().print_cr("Current Frame:");
463 streamIndentor si2(ss);
464 _type.frame()->print_on(ss);
465 }
466 if (_expected.is_valid() && _expected.frame() != NULL) {
467 ss->indent().print_cr("Stackmap Frame:");
468 streamIndentor si2(ss);
469 _expected.frame()->print_on(ss);
470 }
471 }
473 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
474 if (method != NULL) {
475 streamIndentor si(ss);
476 ss->indent().print_cr("Bytecode:");
477 streamIndentor si2(ss);
478 ss->print_data(method->code_base(), method->code_size(), false);
479 }
480 }
482 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
483 if (method != NULL) {
484 streamIndentor si(ss);
485 ExceptionTable table(method);
486 if (table.length() > 0) {
487 ss->indent().print_cr("Exception Handler Table:");
488 streamIndentor si2(ss);
489 for (int i = 0; i < table.length(); ++i) {
490 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
491 table.end_pc(i), table.handler_pc(i));
492 }
493 }
494 }
495 }
497 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
498 if (method != NULL && method->has_stackmap_table()) {
499 streamIndentor si(ss);
500 ss->indent().print_cr("Stackmap Table:");
501 Array<u1>* data = method->stackmap_data();
502 stack_map_table* sm_table =
503 stack_map_table::at((address)data->adr_at(0));
504 stack_map_frame* sm_frame = sm_table->entries();
505 streamIndentor si2(ss);
506 int current_offset = -1;
507 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
508 ss->indent();
509 sm_frame->print_on(ss, current_offset);
510 ss->cr();
511 current_offset += sm_frame->offset_delta();
512 sm_frame = sm_frame->next();
513 }
514 }
515 }
517 // Methods in ClassVerifier
519 ClassVerifier::ClassVerifier(
520 instanceKlassHandle klass, TRAPS)
521 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
522 _this_type = VerificationType::reference_type(klass->name());
523 // Create list to hold symbols in reference area.
524 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
525 }
527 ClassVerifier::~ClassVerifier() {
528 // Decrement the reference count for any symbols created.
529 for (int i = 0; i < _symbols->length(); i++) {
530 Symbol* s = _symbols->at(i);
531 s->decrement_refcount();
532 }
533 }
535 VerificationType ClassVerifier::object_type() const {
536 return VerificationType::reference_type(vmSymbols::java_lang_Object());
537 }
539 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) {
540 VerificationType vt = VerificationType::reference_type(
541 create_temporary_symbol(sig, (int)strlen(sig), THREAD));
542 return TypeOrigin::implicit(vt);
543 }
545 void ClassVerifier::verify_class(TRAPS) {
546 if (VerboseVerification) {
547 tty->print_cr("Verifying class %s with new format",
548 _klass->external_name());
549 }
551 Array<Method*>* methods = _klass->methods();
552 int num_methods = methods->length();
554 for (int index = 0; index < num_methods; index++) {
555 // Check for recursive re-verification before each method.
556 if (was_recursively_verified()) return;
558 Method* m = methods->at(index);
559 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
560 // If m is native or abstract, skip it. It is checked in class file
561 // parser that methods do not override a final method. Overpass methods
562 // are trusted since the VM generates them.
563 continue;
564 }
565 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
566 }
568 if (VerboseVerification || TraceClassInitialization) {
569 if (was_recursively_verified())
570 tty->print_cr("Recursive verification detected for: %s",
571 _klass->external_name());
572 }
573 }
575 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
576 HandleMark hm(THREAD);
577 _method = m; // initialize _method
578 if (VerboseVerification) {
579 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
580 }
582 // For clang, the only good constant format string is a literal constant format string.
583 #define bad_type_msg "Bad type on operand stack in %s"
585 int32_t max_stack = m->verifier_max_stack();
586 int32_t max_locals = m->max_locals();
587 constantPoolHandle cp(THREAD, m->constants());
589 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
590 class_format_error("Invalid method signature");
591 return;
592 }
594 // Initial stack map frame: offset is 0, stack is initially empty.
595 StackMapFrame current_frame(max_locals, max_stack, this);
596 // Set initial locals
597 VerificationType return_type = current_frame.set_locals_from_arg(
598 m, current_type(), CHECK_VERIFY(this));
600 int32_t stackmap_index = 0; // index to the stackmap array
602 u4 code_length = m->code_size();
604 // Scan the bytecode and map each instruction's start offset to a number.
605 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
607 int ex_min = code_length;
608 int ex_max = -1;
609 // Look through each item on the exception table. Each of the fields must refer
610 // to a legal instruction.
611 verify_exception_handler_table(
612 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
614 // Look through each entry on the local variable table and make sure
615 // its range of code array offsets is valid. (4169817)
616 if (m->has_localvariable_table()) {
617 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
618 }
620 Array<u1>* stackmap_data = m->stackmap_data();
621 StackMapStream stream(stackmap_data);
622 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
623 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
624 code_data, code_length, CHECK_VERIFY(this));
626 if (VerboseVerification) {
627 stackmap_table.print_on(tty);
628 }
630 RawBytecodeStream bcs(m);
632 // Scan the byte code linearly from the start to the end
633 bool no_control_flow = false; // Set to true when there is no direct control
634 // flow from current instruction to the next
635 // instruction in sequence
637 Bytecodes::Code opcode;
638 while (!bcs.is_last_bytecode()) {
639 // Check for recursive re-verification before each bytecode.
640 if (was_recursively_verified()) return;
642 opcode = bcs.raw_next();
643 u2 bci = bcs.bci();
645 // Set current frame's offset to bci
646 current_frame.set_offset(bci);
647 current_frame.set_mark();
649 // Make sure every offset in stackmap table point to the beginning to
650 // an instruction. Match current_frame to stackmap_table entry with
651 // the same offset if exists.
652 stackmap_index = verify_stackmap_table(
653 stackmap_index, bci, ¤t_frame, &stackmap_table,
654 no_control_flow, CHECK_VERIFY(this));
657 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
658 bool verified_exc_handlers = false;
660 // Merge with the next instruction
661 {
662 u2 index;
663 int target;
664 VerificationType type, type2;
665 VerificationType atype;
667 #ifndef PRODUCT
668 if (VerboseVerification) {
669 current_frame.print_on(tty);
670 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
671 }
672 #endif
674 // Make sure wide instruction is in correct format
675 if (bcs.is_wide()) {
676 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
677 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
678 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
679 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
680 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
681 opcode != Bytecodes::_dstore) {
682 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
683 * if we encounter a wide instruction that modifies an invalid
684 * opcode (not one of the ones listed above) */
685 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
686 return;
687 }
688 }
690 // Look for possible jump target in exception handlers and see if it
691 // matches current_frame. Do this check here for astore*, dstore*,
692 // fstore*, istore*, and lstore* opcodes because they can change the type
693 // state by adding a local. JVM Spec says that the incoming type state
694 // should be used for this check. So, do the check here before a possible
695 // local is added to the type state.
696 if (Bytecodes::is_store_into_local(opcode) && bci >= ex_min && bci < ex_max) {
697 verify_exception_handler_targets(
698 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
699 verified_exc_handlers = true;
700 }
702 switch (opcode) {
703 case Bytecodes::_nop :
704 no_control_flow = false; break;
705 case Bytecodes::_aconst_null :
706 current_frame.push_stack(
707 VerificationType::null_type(), CHECK_VERIFY(this));
708 no_control_flow = false; break;
709 case Bytecodes::_iconst_m1 :
710 case Bytecodes::_iconst_0 :
711 case Bytecodes::_iconst_1 :
712 case Bytecodes::_iconst_2 :
713 case Bytecodes::_iconst_3 :
714 case Bytecodes::_iconst_4 :
715 case Bytecodes::_iconst_5 :
716 current_frame.push_stack(
717 VerificationType::integer_type(), CHECK_VERIFY(this));
718 no_control_flow = false; break;
719 case Bytecodes::_lconst_0 :
720 case Bytecodes::_lconst_1 :
721 current_frame.push_stack_2(
722 VerificationType::long_type(),
723 VerificationType::long2_type(), CHECK_VERIFY(this));
724 no_control_flow = false; break;
725 case Bytecodes::_fconst_0 :
726 case Bytecodes::_fconst_1 :
727 case Bytecodes::_fconst_2 :
728 current_frame.push_stack(
729 VerificationType::float_type(), CHECK_VERIFY(this));
730 no_control_flow = false; break;
731 case Bytecodes::_dconst_0 :
732 case Bytecodes::_dconst_1 :
733 current_frame.push_stack_2(
734 VerificationType::double_type(),
735 VerificationType::double2_type(), CHECK_VERIFY(this));
736 no_control_flow = false; break;
737 case Bytecodes::_sipush :
738 case Bytecodes::_bipush :
739 current_frame.push_stack(
740 VerificationType::integer_type(), CHECK_VERIFY(this));
741 no_control_flow = false; break;
742 case Bytecodes::_ldc :
743 verify_ldc(
744 opcode, bcs.get_index_u1(), ¤t_frame,
745 cp, bci, CHECK_VERIFY(this));
746 no_control_flow = false; break;
747 case Bytecodes::_ldc_w :
748 case Bytecodes::_ldc2_w :
749 verify_ldc(
750 opcode, bcs.get_index_u2(), ¤t_frame,
751 cp, bci, CHECK_VERIFY(this));
752 no_control_flow = false; break;
753 case Bytecodes::_iload :
754 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
755 no_control_flow = false; break;
756 case Bytecodes::_iload_0 :
757 case Bytecodes::_iload_1 :
758 case Bytecodes::_iload_2 :
759 case Bytecodes::_iload_3 :
760 index = opcode - Bytecodes::_iload_0;
761 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
762 no_control_flow = false; break;
763 case Bytecodes::_lload :
764 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
765 no_control_flow = false; break;
766 case Bytecodes::_lload_0 :
767 case Bytecodes::_lload_1 :
768 case Bytecodes::_lload_2 :
769 case Bytecodes::_lload_3 :
770 index = opcode - Bytecodes::_lload_0;
771 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
772 no_control_flow = false; break;
773 case Bytecodes::_fload :
774 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
775 no_control_flow = false; break;
776 case Bytecodes::_fload_0 :
777 case Bytecodes::_fload_1 :
778 case Bytecodes::_fload_2 :
779 case Bytecodes::_fload_3 :
780 index = opcode - Bytecodes::_fload_0;
781 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
782 no_control_flow = false; break;
783 case Bytecodes::_dload :
784 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
785 no_control_flow = false; break;
786 case Bytecodes::_dload_0 :
787 case Bytecodes::_dload_1 :
788 case Bytecodes::_dload_2 :
789 case Bytecodes::_dload_3 :
790 index = opcode - Bytecodes::_dload_0;
791 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
792 no_control_flow = false; break;
793 case Bytecodes::_aload :
794 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
795 no_control_flow = false; break;
796 case Bytecodes::_aload_0 :
797 case Bytecodes::_aload_1 :
798 case Bytecodes::_aload_2 :
799 case Bytecodes::_aload_3 :
800 index = opcode - Bytecodes::_aload_0;
801 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
802 no_control_flow = false; break;
803 case Bytecodes::_iaload :
804 type = current_frame.pop_stack(
805 VerificationType::integer_type(), CHECK_VERIFY(this));
806 atype = current_frame.pop_stack(
807 VerificationType::reference_check(), CHECK_VERIFY(this));
808 if (!atype.is_int_array()) {
809 verify_error(ErrorContext::bad_type(bci,
810 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
811 bad_type_msg, "iaload");
812 return;
813 }
814 current_frame.push_stack(
815 VerificationType::integer_type(), CHECK_VERIFY(this));
816 no_control_flow = false; break;
817 case Bytecodes::_baload :
818 type = current_frame.pop_stack(
819 VerificationType::integer_type(), CHECK_VERIFY(this));
820 atype = current_frame.pop_stack(
821 VerificationType::reference_check(), CHECK_VERIFY(this));
822 if (!atype.is_bool_array() && !atype.is_byte_array()) {
823 verify_error(
824 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
825 bad_type_msg, "baload");
826 return;
827 }
828 current_frame.push_stack(
829 VerificationType::integer_type(), CHECK_VERIFY(this));
830 no_control_flow = false; break;
831 case Bytecodes::_caload :
832 type = current_frame.pop_stack(
833 VerificationType::integer_type(), CHECK_VERIFY(this));
834 atype = current_frame.pop_stack(
835 VerificationType::reference_check(), CHECK_VERIFY(this));
836 if (!atype.is_char_array()) {
837 verify_error(ErrorContext::bad_type(bci,
838 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
839 bad_type_msg, "caload");
840 return;
841 }
842 current_frame.push_stack(
843 VerificationType::integer_type(), CHECK_VERIFY(this));
844 no_control_flow = false; break;
845 case Bytecodes::_saload :
846 type = current_frame.pop_stack(
847 VerificationType::integer_type(), CHECK_VERIFY(this));
848 atype = current_frame.pop_stack(
849 VerificationType::reference_check(), CHECK_VERIFY(this));
850 if (!atype.is_short_array()) {
851 verify_error(ErrorContext::bad_type(bci,
852 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
853 bad_type_msg, "saload");
854 return;
855 }
856 current_frame.push_stack(
857 VerificationType::integer_type(), CHECK_VERIFY(this));
858 no_control_flow = false; break;
859 case Bytecodes::_laload :
860 type = current_frame.pop_stack(
861 VerificationType::integer_type(), CHECK_VERIFY(this));
862 atype = current_frame.pop_stack(
863 VerificationType::reference_check(), CHECK_VERIFY(this));
864 if (!atype.is_long_array()) {
865 verify_error(ErrorContext::bad_type(bci,
866 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
867 bad_type_msg, "laload");
868 return;
869 }
870 current_frame.push_stack_2(
871 VerificationType::long_type(),
872 VerificationType::long2_type(), CHECK_VERIFY(this));
873 no_control_flow = false; break;
874 case Bytecodes::_faload :
875 type = current_frame.pop_stack(
876 VerificationType::integer_type(), CHECK_VERIFY(this));
877 atype = current_frame.pop_stack(
878 VerificationType::reference_check(), CHECK_VERIFY(this));
879 if (!atype.is_float_array()) {
880 verify_error(ErrorContext::bad_type(bci,
881 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
882 bad_type_msg, "faload");
883 return;
884 }
885 current_frame.push_stack(
886 VerificationType::float_type(), CHECK_VERIFY(this));
887 no_control_flow = false; break;
888 case Bytecodes::_daload :
889 type = current_frame.pop_stack(
890 VerificationType::integer_type(), CHECK_VERIFY(this));
891 atype = current_frame.pop_stack(
892 VerificationType::reference_check(), CHECK_VERIFY(this));
893 if (!atype.is_double_array()) {
894 verify_error(ErrorContext::bad_type(bci,
895 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
896 bad_type_msg, "daload");
897 return;
898 }
899 current_frame.push_stack_2(
900 VerificationType::double_type(),
901 VerificationType::double2_type(), CHECK_VERIFY(this));
902 no_control_flow = false; break;
903 case Bytecodes::_aaload : {
904 type = current_frame.pop_stack(
905 VerificationType::integer_type(), CHECK_VERIFY(this));
906 atype = current_frame.pop_stack(
907 VerificationType::reference_check(), CHECK_VERIFY(this));
908 if (!atype.is_reference_array()) {
909 verify_error(ErrorContext::bad_type(bci,
910 current_frame.stack_top_ctx(),
911 TypeOrigin::implicit(VerificationType::reference_check())),
912 bad_type_msg, "aaload");
913 return;
914 }
915 if (atype.is_null()) {
916 current_frame.push_stack(
917 VerificationType::null_type(), CHECK_VERIFY(this));
918 } else {
919 VerificationType component =
920 atype.get_component(this, CHECK_VERIFY(this));
921 current_frame.push_stack(component, CHECK_VERIFY(this));
922 }
923 no_control_flow = false; break;
924 }
925 case Bytecodes::_istore :
926 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
927 no_control_flow = false; break;
928 case Bytecodes::_istore_0 :
929 case Bytecodes::_istore_1 :
930 case Bytecodes::_istore_2 :
931 case Bytecodes::_istore_3 :
932 index = opcode - Bytecodes::_istore_0;
933 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
934 no_control_flow = false; break;
935 case Bytecodes::_lstore :
936 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
937 no_control_flow = false; break;
938 case Bytecodes::_lstore_0 :
939 case Bytecodes::_lstore_1 :
940 case Bytecodes::_lstore_2 :
941 case Bytecodes::_lstore_3 :
942 index = opcode - Bytecodes::_lstore_0;
943 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
944 no_control_flow = false; break;
945 case Bytecodes::_fstore :
946 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
947 no_control_flow = false; break;
948 case Bytecodes::_fstore_0 :
949 case Bytecodes::_fstore_1 :
950 case Bytecodes::_fstore_2 :
951 case Bytecodes::_fstore_3 :
952 index = opcode - Bytecodes::_fstore_0;
953 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
954 no_control_flow = false; break;
955 case Bytecodes::_dstore :
956 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
957 no_control_flow = false; break;
958 case Bytecodes::_dstore_0 :
959 case Bytecodes::_dstore_1 :
960 case Bytecodes::_dstore_2 :
961 case Bytecodes::_dstore_3 :
962 index = opcode - Bytecodes::_dstore_0;
963 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
964 no_control_flow = false; break;
965 case Bytecodes::_astore :
966 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
967 no_control_flow = false; break;
968 case Bytecodes::_astore_0 :
969 case Bytecodes::_astore_1 :
970 case Bytecodes::_astore_2 :
971 case Bytecodes::_astore_3 :
972 index = opcode - Bytecodes::_astore_0;
973 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
974 no_control_flow = false; break;
975 case Bytecodes::_iastore :
976 type = current_frame.pop_stack(
977 VerificationType::integer_type(), CHECK_VERIFY(this));
978 type2 = current_frame.pop_stack(
979 VerificationType::integer_type(), CHECK_VERIFY(this));
980 atype = current_frame.pop_stack(
981 VerificationType::reference_check(), CHECK_VERIFY(this));
982 if (!atype.is_int_array()) {
983 verify_error(ErrorContext::bad_type(bci,
984 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
985 bad_type_msg, "iastore");
986 return;
987 }
988 no_control_flow = false; break;
989 case Bytecodes::_bastore :
990 type = current_frame.pop_stack(
991 VerificationType::integer_type(), CHECK_VERIFY(this));
992 type2 = current_frame.pop_stack(
993 VerificationType::integer_type(), CHECK_VERIFY(this));
994 atype = current_frame.pop_stack(
995 VerificationType::reference_check(), CHECK_VERIFY(this));
996 if (!atype.is_bool_array() && !atype.is_byte_array()) {
997 verify_error(
998 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
999 bad_type_msg, "bastore");
1000 return;
1001 }
1002 no_control_flow = false; break;
1003 case Bytecodes::_castore :
1004 current_frame.pop_stack(
1005 VerificationType::integer_type(), CHECK_VERIFY(this));
1006 current_frame.pop_stack(
1007 VerificationType::integer_type(), CHECK_VERIFY(this));
1008 atype = current_frame.pop_stack(
1009 VerificationType::reference_check(), CHECK_VERIFY(this));
1010 if (!atype.is_char_array()) {
1011 verify_error(ErrorContext::bad_type(bci,
1012 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
1013 bad_type_msg, "castore");
1014 return;
1015 }
1016 no_control_flow = false; break;
1017 case Bytecodes::_sastore :
1018 current_frame.pop_stack(
1019 VerificationType::integer_type(), CHECK_VERIFY(this));
1020 current_frame.pop_stack(
1021 VerificationType::integer_type(), CHECK_VERIFY(this));
1022 atype = current_frame.pop_stack(
1023 VerificationType::reference_check(), CHECK_VERIFY(this));
1024 if (!atype.is_short_array()) {
1025 verify_error(ErrorContext::bad_type(bci,
1026 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1027 bad_type_msg, "sastore");
1028 return;
1029 }
1030 no_control_flow = false; break;
1031 case Bytecodes::_lastore :
1032 current_frame.pop_stack_2(
1033 VerificationType::long2_type(),
1034 VerificationType::long_type(), CHECK_VERIFY(this));
1035 current_frame.pop_stack(
1036 VerificationType::integer_type(), CHECK_VERIFY(this));
1037 atype = current_frame.pop_stack(
1038 VerificationType::reference_check(), CHECK_VERIFY(this));
1039 if (!atype.is_long_array()) {
1040 verify_error(ErrorContext::bad_type(bci,
1041 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1042 bad_type_msg, "lastore");
1043 return;
1044 }
1045 no_control_flow = false; break;
1046 case Bytecodes::_fastore :
1047 current_frame.pop_stack(
1048 VerificationType::float_type(), CHECK_VERIFY(this));
1049 current_frame.pop_stack
1050 (VerificationType::integer_type(), CHECK_VERIFY(this));
1051 atype = current_frame.pop_stack(
1052 VerificationType::reference_check(), CHECK_VERIFY(this));
1053 if (!atype.is_float_array()) {
1054 verify_error(ErrorContext::bad_type(bci,
1055 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1056 bad_type_msg, "fastore");
1057 return;
1058 }
1059 no_control_flow = false; break;
1060 case Bytecodes::_dastore :
1061 current_frame.pop_stack_2(
1062 VerificationType::double2_type(),
1063 VerificationType::double_type(), CHECK_VERIFY(this));
1064 current_frame.pop_stack(
1065 VerificationType::integer_type(), CHECK_VERIFY(this));
1066 atype = current_frame.pop_stack(
1067 VerificationType::reference_check(), CHECK_VERIFY(this));
1068 if (!atype.is_double_array()) {
1069 verify_error(ErrorContext::bad_type(bci,
1070 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1071 bad_type_msg, "dastore");
1072 return;
1073 }
1074 no_control_flow = false; break;
1075 case Bytecodes::_aastore :
1076 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1077 type2 = current_frame.pop_stack(
1078 VerificationType::integer_type(), CHECK_VERIFY(this));
1079 atype = current_frame.pop_stack(
1080 VerificationType::reference_check(), CHECK_VERIFY(this));
1081 // more type-checking is done at runtime
1082 if (!atype.is_reference_array()) {
1083 verify_error(ErrorContext::bad_type(bci,
1084 current_frame.stack_top_ctx(),
1085 TypeOrigin::implicit(VerificationType::reference_check())),
1086 bad_type_msg, "aastore");
1087 return;
1088 }
1089 // 4938384: relaxed constraint in JVMS 3nd edition.
1090 no_control_flow = false; break;
1091 case Bytecodes::_pop :
1092 current_frame.pop_stack(
1093 VerificationType::category1_check(), CHECK_VERIFY(this));
1094 no_control_flow = false; break;
1095 case Bytecodes::_pop2 :
1096 type = current_frame.pop_stack(CHECK_VERIFY(this));
1097 if (type.is_category1()) {
1098 current_frame.pop_stack(
1099 VerificationType::category1_check(), CHECK_VERIFY(this));
1100 } else if (type.is_category2_2nd()) {
1101 current_frame.pop_stack(
1102 VerificationType::category2_check(), CHECK_VERIFY(this));
1103 } else {
1104 /* Unreachable? Would need a category2_1st on TOS
1105 * which does not appear possible. */
1106 verify_error(
1107 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1108 bad_type_msg, "pop2");
1109 return;
1110 }
1111 no_control_flow = false; break;
1112 case Bytecodes::_dup :
1113 type = current_frame.pop_stack(
1114 VerificationType::category1_check(), CHECK_VERIFY(this));
1115 current_frame.push_stack(type, CHECK_VERIFY(this));
1116 current_frame.push_stack(type, CHECK_VERIFY(this));
1117 no_control_flow = false; break;
1118 case Bytecodes::_dup_x1 :
1119 type = current_frame.pop_stack(
1120 VerificationType::category1_check(), CHECK_VERIFY(this));
1121 type2 = current_frame.pop_stack(
1122 VerificationType::category1_check(), CHECK_VERIFY(this));
1123 current_frame.push_stack(type, CHECK_VERIFY(this));
1124 current_frame.push_stack(type2, CHECK_VERIFY(this));
1125 current_frame.push_stack(type, CHECK_VERIFY(this));
1126 no_control_flow = false; break;
1127 case Bytecodes::_dup_x2 :
1128 {
1129 VerificationType type3;
1130 type = current_frame.pop_stack(
1131 VerificationType::category1_check(), CHECK_VERIFY(this));
1132 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1133 if (type2.is_category1()) {
1134 type3 = current_frame.pop_stack(
1135 VerificationType::category1_check(), CHECK_VERIFY(this));
1136 } else if (type2.is_category2_2nd()) {
1137 type3 = current_frame.pop_stack(
1138 VerificationType::category2_check(), CHECK_VERIFY(this));
1139 } else {
1140 /* Unreachable? Would need a category2_1st at stack depth 2 with
1141 * a category1 on TOS which does not appear possible. */
1142 verify_error(ErrorContext::bad_type(
1143 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1144 return;
1145 }
1146 current_frame.push_stack(type, CHECK_VERIFY(this));
1147 current_frame.push_stack(type3, CHECK_VERIFY(this));
1148 current_frame.push_stack(type2, CHECK_VERIFY(this));
1149 current_frame.push_stack(type, CHECK_VERIFY(this));
1150 no_control_flow = false; break;
1151 }
1152 case Bytecodes::_dup2 :
1153 type = current_frame.pop_stack(CHECK_VERIFY(this));
1154 if (type.is_category1()) {
1155 type2 = current_frame.pop_stack(
1156 VerificationType::category1_check(), CHECK_VERIFY(this));
1157 } else if (type.is_category2_2nd()) {
1158 type2 = current_frame.pop_stack(
1159 VerificationType::category2_check(), CHECK_VERIFY(this));
1160 } else {
1161 /* Unreachable? Would need a category2_1st on TOS which does not
1162 * appear possible. */
1163 verify_error(
1164 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1165 bad_type_msg, "dup2");
1166 return;
1167 }
1168 current_frame.push_stack(type2, CHECK_VERIFY(this));
1169 current_frame.push_stack(type, CHECK_VERIFY(this));
1170 current_frame.push_stack(type2, CHECK_VERIFY(this));
1171 current_frame.push_stack(type, CHECK_VERIFY(this));
1172 no_control_flow = false; break;
1173 case Bytecodes::_dup2_x1 :
1174 {
1175 VerificationType type3;
1176 type = current_frame.pop_stack(CHECK_VERIFY(this));
1177 if (type.is_category1()) {
1178 type2 = current_frame.pop_stack(
1179 VerificationType::category1_check(), CHECK_VERIFY(this));
1180 } else if (type.is_category2_2nd()) {
1181 type2 = current_frame.pop_stack(
1182 VerificationType::category2_check(), CHECK_VERIFY(this));
1183 } else {
1184 /* Unreachable? Would need a category2_1st on TOS which does
1185 * not appear possible. */
1186 verify_error(
1187 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1188 bad_type_msg, "dup2_x1");
1189 return;
1190 }
1191 type3 = current_frame.pop_stack(
1192 VerificationType::category1_check(), CHECK_VERIFY(this));
1193 current_frame.push_stack(type2, CHECK_VERIFY(this));
1194 current_frame.push_stack(type, CHECK_VERIFY(this));
1195 current_frame.push_stack(type3, CHECK_VERIFY(this));
1196 current_frame.push_stack(type2, CHECK_VERIFY(this));
1197 current_frame.push_stack(type, CHECK_VERIFY(this));
1198 no_control_flow = false; break;
1199 }
1200 case Bytecodes::_dup2_x2 :
1201 {
1202 VerificationType type3, type4;
1203 type = current_frame.pop_stack(CHECK_VERIFY(this));
1204 if (type.is_category1()) {
1205 type2 = current_frame.pop_stack(
1206 VerificationType::category1_check(), CHECK_VERIFY(this));
1207 } else if (type.is_category2_2nd()) {
1208 type2 = current_frame.pop_stack(
1209 VerificationType::category2_check(), CHECK_VERIFY(this));
1210 } else {
1211 /* Unreachable? Would need a category2_1st on TOS which does
1212 * not appear possible. */
1213 verify_error(
1214 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1215 bad_type_msg, "dup2_x2");
1216 return;
1217 }
1218 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1219 if (type3.is_category1()) {
1220 type4 = current_frame.pop_stack(
1221 VerificationType::category1_check(), CHECK_VERIFY(this));
1222 } else if (type3.is_category2_2nd()) {
1223 type4 = current_frame.pop_stack(
1224 VerificationType::category2_check(), CHECK_VERIFY(this));
1225 } else {
1226 /* Unreachable? Would need a category2_1st on TOS after popping
1227 * a long/double or two category 1's, which does not
1228 * appear possible. */
1229 verify_error(
1230 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1231 bad_type_msg, "dup2_x2");
1232 return;
1233 }
1234 current_frame.push_stack(type2, CHECK_VERIFY(this));
1235 current_frame.push_stack(type, CHECK_VERIFY(this));
1236 current_frame.push_stack(type4, CHECK_VERIFY(this));
1237 current_frame.push_stack(type3, CHECK_VERIFY(this));
1238 current_frame.push_stack(type2, CHECK_VERIFY(this));
1239 current_frame.push_stack(type, CHECK_VERIFY(this));
1240 no_control_flow = false; break;
1241 }
1242 case Bytecodes::_swap :
1243 type = current_frame.pop_stack(
1244 VerificationType::category1_check(), CHECK_VERIFY(this));
1245 type2 = current_frame.pop_stack(
1246 VerificationType::category1_check(), CHECK_VERIFY(this));
1247 current_frame.push_stack(type, CHECK_VERIFY(this));
1248 current_frame.push_stack(type2, CHECK_VERIFY(this));
1249 no_control_flow = false; break;
1250 case Bytecodes::_iadd :
1251 case Bytecodes::_isub :
1252 case Bytecodes::_imul :
1253 case Bytecodes::_idiv :
1254 case Bytecodes::_irem :
1255 case Bytecodes::_ishl :
1256 case Bytecodes::_ishr :
1257 case Bytecodes::_iushr :
1258 case Bytecodes::_ior :
1259 case Bytecodes::_ixor :
1260 case Bytecodes::_iand :
1261 current_frame.pop_stack(
1262 VerificationType::integer_type(), CHECK_VERIFY(this));
1263 // fall through
1264 case Bytecodes::_ineg :
1265 current_frame.pop_stack(
1266 VerificationType::integer_type(), CHECK_VERIFY(this));
1267 current_frame.push_stack(
1268 VerificationType::integer_type(), CHECK_VERIFY(this));
1269 no_control_flow = false; break;
1270 case Bytecodes::_ladd :
1271 case Bytecodes::_lsub :
1272 case Bytecodes::_lmul :
1273 case Bytecodes::_ldiv :
1274 case Bytecodes::_lrem :
1275 case Bytecodes::_land :
1276 case Bytecodes::_lor :
1277 case Bytecodes::_lxor :
1278 current_frame.pop_stack_2(
1279 VerificationType::long2_type(),
1280 VerificationType::long_type(), CHECK_VERIFY(this));
1281 // fall through
1282 case Bytecodes::_lneg :
1283 current_frame.pop_stack_2(
1284 VerificationType::long2_type(),
1285 VerificationType::long_type(), CHECK_VERIFY(this));
1286 current_frame.push_stack_2(
1287 VerificationType::long_type(),
1288 VerificationType::long2_type(), CHECK_VERIFY(this));
1289 no_control_flow = false; break;
1290 case Bytecodes::_lshl :
1291 case Bytecodes::_lshr :
1292 case Bytecodes::_lushr :
1293 current_frame.pop_stack(
1294 VerificationType::integer_type(), CHECK_VERIFY(this));
1295 current_frame.pop_stack_2(
1296 VerificationType::long2_type(),
1297 VerificationType::long_type(), CHECK_VERIFY(this));
1298 current_frame.push_stack_2(
1299 VerificationType::long_type(),
1300 VerificationType::long2_type(), CHECK_VERIFY(this));
1301 no_control_flow = false; break;
1302 case Bytecodes::_fadd :
1303 case Bytecodes::_fsub :
1304 case Bytecodes::_fmul :
1305 case Bytecodes::_fdiv :
1306 case Bytecodes::_frem :
1307 current_frame.pop_stack(
1308 VerificationType::float_type(), CHECK_VERIFY(this));
1309 // fall through
1310 case Bytecodes::_fneg :
1311 current_frame.pop_stack(
1312 VerificationType::float_type(), CHECK_VERIFY(this));
1313 current_frame.push_stack(
1314 VerificationType::float_type(), CHECK_VERIFY(this));
1315 no_control_flow = false; break;
1316 case Bytecodes::_dadd :
1317 case Bytecodes::_dsub :
1318 case Bytecodes::_dmul :
1319 case Bytecodes::_ddiv :
1320 case Bytecodes::_drem :
1321 current_frame.pop_stack_2(
1322 VerificationType::double2_type(),
1323 VerificationType::double_type(), CHECK_VERIFY(this));
1324 // fall through
1325 case Bytecodes::_dneg :
1326 current_frame.pop_stack_2(
1327 VerificationType::double2_type(),
1328 VerificationType::double_type(), CHECK_VERIFY(this));
1329 current_frame.push_stack_2(
1330 VerificationType::double_type(),
1331 VerificationType::double2_type(), CHECK_VERIFY(this));
1332 no_control_flow = false; break;
1333 case Bytecodes::_iinc :
1334 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1335 no_control_flow = false; break;
1336 case Bytecodes::_i2l :
1337 type = current_frame.pop_stack(
1338 VerificationType::integer_type(), CHECK_VERIFY(this));
1339 current_frame.push_stack_2(
1340 VerificationType::long_type(),
1341 VerificationType::long2_type(), CHECK_VERIFY(this));
1342 no_control_flow = false; break;
1343 case Bytecodes::_l2i :
1344 current_frame.pop_stack_2(
1345 VerificationType::long2_type(),
1346 VerificationType::long_type(), CHECK_VERIFY(this));
1347 current_frame.push_stack(
1348 VerificationType::integer_type(), CHECK_VERIFY(this));
1349 no_control_flow = false; break;
1350 case Bytecodes::_i2f :
1351 current_frame.pop_stack(
1352 VerificationType::integer_type(), CHECK_VERIFY(this));
1353 current_frame.push_stack(
1354 VerificationType::float_type(), CHECK_VERIFY(this));
1355 no_control_flow = false; break;
1356 case Bytecodes::_i2d :
1357 current_frame.pop_stack(
1358 VerificationType::integer_type(), CHECK_VERIFY(this));
1359 current_frame.push_stack_2(
1360 VerificationType::double_type(),
1361 VerificationType::double2_type(), CHECK_VERIFY(this));
1362 no_control_flow = false; break;
1363 case Bytecodes::_l2f :
1364 current_frame.pop_stack_2(
1365 VerificationType::long2_type(),
1366 VerificationType::long_type(), CHECK_VERIFY(this));
1367 current_frame.push_stack(
1368 VerificationType::float_type(), CHECK_VERIFY(this));
1369 no_control_flow = false; break;
1370 case Bytecodes::_l2d :
1371 current_frame.pop_stack_2(
1372 VerificationType::long2_type(),
1373 VerificationType::long_type(), CHECK_VERIFY(this));
1374 current_frame.push_stack_2(
1375 VerificationType::double_type(),
1376 VerificationType::double2_type(), CHECK_VERIFY(this));
1377 no_control_flow = false; break;
1378 case Bytecodes::_f2i :
1379 current_frame.pop_stack(
1380 VerificationType::float_type(), CHECK_VERIFY(this));
1381 current_frame.push_stack(
1382 VerificationType::integer_type(), CHECK_VERIFY(this));
1383 no_control_flow = false; break;
1384 case Bytecodes::_f2l :
1385 current_frame.pop_stack(
1386 VerificationType::float_type(), CHECK_VERIFY(this));
1387 current_frame.push_stack_2(
1388 VerificationType::long_type(),
1389 VerificationType::long2_type(), CHECK_VERIFY(this));
1390 no_control_flow = false; break;
1391 case Bytecodes::_f2d :
1392 current_frame.pop_stack(
1393 VerificationType::float_type(), CHECK_VERIFY(this));
1394 current_frame.push_stack_2(
1395 VerificationType::double_type(),
1396 VerificationType::double2_type(), CHECK_VERIFY(this));
1397 no_control_flow = false; break;
1398 case Bytecodes::_d2i :
1399 current_frame.pop_stack_2(
1400 VerificationType::double2_type(),
1401 VerificationType::double_type(), CHECK_VERIFY(this));
1402 current_frame.push_stack(
1403 VerificationType::integer_type(), CHECK_VERIFY(this));
1404 no_control_flow = false; break;
1405 case Bytecodes::_d2l :
1406 current_frame.pop_stack_2(
1407 VerificationType::double2_type(),
1408 VerificationType::double_type(), CHECK_VERIFY(this));
1409 current_frame.push_stack_2(
1410 VerificationType::long_type(),
1411 VerificationType::long2_type(), CHECK_VERIFY(this));
1412 no_control_flow = false; break;
1413 case Bytecodes::_d2f :
1414 current_frame.pop_stack_2(
1415 VerificationType::double2_type(),
1416 VerificationType::double_type(), CHECK_VERIFY(this));
1417 current_frame.push_stack(
1418 VerificationType::float_type(), CHECK_VERIFY(this));
1419 no_control_flow = false; break;
1420 case Bytecodes::_i2b :
1421 case Bytecodes::_i2c :
1422 case Bytecodes::_i2s :
1423 current_frame.pop_stack(
1424 VerificationType::integer_type(), CHECK_VERIFY(this));
1425 current_frame.push_stack(
1426 VerificationType::integer_type(), CHECK_VERIFY(this));
1427 no_control_flow = false; break;
1428 case Bytecodes::_lcmp :
1429 current_frame.pop_stack_2(
1430 VerificationType::long2_type(),
1431 VerificationType::long_type(), CHECK_VERIFY(this));
1432 current_frame.pop_stack_2(
1433 VerificationType::long2_type(),
1434 VerificationType::long_type(), CHECK_VERIFY(this));
1435 current_frame.push_stack(
1436 VerificationType::integer_type(), CHECK_VERIFY(this));
1437 no_control_flow = false; break;
1438 case Bytecodes::_fcmpl :
1439 case Bytecodes::_fcmpg :
1440 current_frame.pop_stack(
1441 VerificationType::float_type(), CHECK_VERIFY(this));
1442 current_frame.pop_stack(
1443 VerificationType::float_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::_dcmpl :
1448 case Bytecodes::_dcmpg :
1449 current_frame.pop_stack_2(
1450 VerificationType::double2_type(),
1451 VerificationType::double_type(), CHECK_VERIFY(this));
1452 current_frame.pop_stack_2(
1453 VerificationType::double2_type(),
1454 VerificationType::double_type(), CHECK_VERIFY(this));
1455 current_frame.push_stack(
1456 VerificationType::integer_type(), CHECK_VERIFY(this));
1457 no_control_flow = false; break;
1458 case Bytecodes::_if_icmpeq:
1459 case Bytecodes::_if_icmpne:
1460 case Bytecodes::_if_icmplt:
1461 case Bytecodes::_if_icmpge:
1462 case Bytecodes::_if_icmpgt:
1463 case Bytecodes::_if_icmple:
1464 current_frame.pop_stack(
1465 VerificationType::integer_type(), CHECK_VERIFY(this));
1466 // fall through
1467 case Bytecodes::_ifeq:
1468 case Bytecodes::_ifne:
1469 case Bytecodes::_iflt:
1470 case Bytecodes::_ifge:
1471 case Bytecodes::_ifgt:
1472 case Bytecodes::_ifle:
1473 current_frame.pop_stack(
1474 VerificationType::integer_type(), CHECK_VERIFY(this));
1475 target = bcs.dest();
1476 stackmap_table.check_jump_target(
1477 ¤t_frame, target, CHECK_VERIFY(this));
1478 no_control_flow = false; break;
1479 case Bytecodes::_if_acmpeq :
1480 case Bytecodes::_if_acmpne :
1481 current_frame.pop_stack(
1482 VerificationType::reference_check(), CHECK_VERIFY(this));
1483 // fall through
1484 case Bytecodes::_ifnull :
1485 case Bytecodes::_ifnonnull :
1486 current_frame.pop_stack(
1487 VerificationType::reference_check(), CHECK_VERIFY(this));
1488 target = bcs.dest();
1489 stackmap_table.check_jump_target
1490 (¤t_frame, target, CHECK_VERIFY(this));
1491 no_control_flow = false; break;
1492 case Bytecodes::_goto :
1493 target = bcs.dest();
1494 stackmap_table.check_jump_target(
1495 ¤t_frame, target, CHECK_VERIFY(this));
1496 no_control_flow = true; break;
1497 case Bytecodes::_goto_w :
1498 target = bcs.dest_w();
1499 stackmap_table.check_jump_target(
1500 ¤t_frame, target, CHECK_VERIFY(this));
1501 no_control_flow = true; break;
1502 case Bytecodes::_tableswitch :
1503 case Bytecodes::_lookupswitch :
1504 verify_switch(
1505 &bcs, code_length, code_data, ¤t_frame,
1506 &stackmap_table, CHECK_VERIFY(this));
1507 no_control_flow = true; break;
1508 case Bytecodes::_ireturn :
1509 type = current_frame.pop_stack(
1510 VerificationType::integer_type(), CHECK_VERIFY(this));
1511 verify_return_value(return_type, type, bci,
1512 ¤t_frame, CHECK_VERIFY(this));
1513 no_control_flow = true; break;
1514 case Bytecodes::_lreturn :
1515 type2 = current_frame.pop_stack(
1516 VerificationType::long2_type(), CHECK_VERIFY(this));
1517 type = current_frame.pop_stack(
1518 VerificationType::long_type(), CHECK_VERIFY(this));
1519 verify_return_value(return_type, type, bci,
1520 ¤t_frame, CHECK_VERIFY(this));
1521 no_control_flow = true; break;
1522 case Bytecodes::_freturn :
1523 type = current_frame.pop_stack(
1524 VerificationType::float_type(), CHECK_VERIFY(this));
1525 verify_return_value(return_type, type, bci,
1526 ¤t_frame, CHECK_VERIFY(this));
1527 no_control_flow = true; break;
1528 case Bytecodes::_dreturn :
1529 type2 = current_frame.pop_stack(
1530 VerificationType::double2_type(), CHECK_VERIFY(this));
1531 type = current_frame.pop_stack(
1532 VerificationType::double_type(), CHECK_VERIFY(this));
1533 verify_return_value(return_type, type, bci,
1534 ¤t_frame, CHECK_VERIFY(this));
1535 no_control_flow = true; break;
1536 case Bytecodes::_areturn :
1537 type = current_frame.pop_stack(
1538 VerificationType::reference_check(), CHECK_VERIFY(this));
1539 verify_return_value(return_type, type, bci,
1540 ¤t_frame, CHECK_VERIFY(this));
1541 no_control_flow = true; break;
1542 case Bytecodes::_return :
1543 if (return_type != VerificationType::bogus_type()) {
1544 verify_error(ErrorContext::bad_code(bci),
1545 "Method expects a return value");
1546 return;
1547 }
1548 // Make sure "this" has been initialized if current method is an
1549 // <init>
1550 if (_method->name() == vmSymbols::object_initializer_name() &&
1551 current_frame.flag_this_uninit()) {
1552 verify_error(ErrorContext::bad_code(bci),
1553 "Constructor must call super() or this() "
1554 "before return");
1555 return;
1556 }
1557 no_control_flow = true; break;
1558 case Bytecodes::_getstatic :
1559 case Bytecodes::_putstatic :
1560 case Bytecodes::_getfield :
1561 case Bytecodes::_putfield :
1562 verify_field_instructions(
1563 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1564 no_control_flow = false; break;
1565 case Bytecodes::_invokevirtual :
1566 case Bytecodes::_invokespecial :
1567 case Bytecodes::_invokestatic :
1568 verify_invoke_instructions(
1569 &bcs, code_length, ¤t_frame, (bci >= ex_min && bci < ex_max),
1570 &this_uninit, return_type, cp, &stackmap_table, CHECK_VERIFY(this));
1571 no_control_flow = false; break;
1572 case Bytecodes::_invokeinterface :
1573 case Bytecodes::_invokedynamic :
1574 verify_invoke_instructions(
1575 &bcs, code_length, ¤t_frame, (bci >= ex_min && bci < ex_max),
1576 &this_uninit, return_type, cp, &stackmap_table, CHECK_VERIFY(this));
1577 no_control_flow = false; break;
1578 case Bytecodes::_new :
1579 {
1580 index = bcs.get_index_u2();
1581 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1582 VerificationType new_class_type =
1583 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1584 if (!new_class_type.is_object()) {
1585 verify_error(ErrorContext::bad_type(bci,
1586 TypeOrigin::cp(index, new_class_type)),
1587 "Illegal new instruction");
1588 return;
1589 }
1590 type = VerificationType::uninitialized_type(bci);
1591 current_frame.push_stack(type, CHECK_VERIFY(this));
1592 no_control_flow = false; break;
1593 }
1594 case Bytecodes::_newarray :
1595 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1596 current_frame.pop_stack(
1597 VerificationType::integer_type(), CHECK_VERIFY(this));
1598 current_frame.push_stack(type, CHECK_VERIFY(this));
1599 no_control_flow = false; break;
1600 case Bytecodes::_anewarray :
1601 verify_anewarray(
1602 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1603 no_control_flow = false; break;
1604 case Bytecodes::_arraylength :
1605 type = current_frame.pop_stack(
1606 VerificationType::reference_check(), CHECK_VERIFY(this));
1607 if (!(type.is_null() || type.is_array())) {
1608 verify_error(ErrorContext::bad_type(
1609 bci, current_frame.stack_top_ctx()),
1610 bad_type_msg, "arraylength");
1611 }
1612 current_frame.push_stack(
1613 VerificationType::integer_type(), CHECK_VERIFY(this));
1614 no_control_flow = false; break;
1615 case Bytecodes::_checkcast :
1616 {
1617 index = bcs.get_index_u2();
1618 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1619 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1620 VerificationType klass_type = cp_index_to_type(
1621 index, cp, CHECK_VERIFY(this));
1622 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1623 no_control_flow = false; break;
1624 }
1625 case Bytecodes::_instanceof : {
1626 index = bcs.get_index_u2();
1627 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1628 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1629 current_frame.push_stack(
1630 VerificationType::integer_type(), CHECK_VERIFY(this));
1631 no_control_flow = false; break;
1632 }
1633 case Bytecodes::_monitorenter :
1634 case Bytecodes::_monitorexit :
1635 current_frame.pop_stack(
1636 VerificationType::reference_check(), CHECK_VERIFY(this));
1637 no_control_flow = false; break;
1638 case Bytecodes::_multianewarray :
1639 {
1640 index = bcs.get_index_u2();
1641 u2 dim = *(bcs.bcp()+3);
1642 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1643 VerificationType new_array_type =
1644 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1645 if (!new_array_type.is_array()) {
1646 verify_error(ErrorContext::bad_type(bci,
1647 TypeOrigin::cp(index, new_array_type)),
1648 "Illegal constant pool index in multianewarray instruction");
1649 return;
1650 }
1651 if (dim < 1 || new_array_type.dimensions() < dim) {
1652 verify_error(ErrorContext::bad_code(bci),
1653 "Illegal dimension in multianewarray instruction: %d", dim);
1654 return;
1655 }
1656 for (int i = 0; i < dim; i++) {
1657 current_frame.pop_stack(
1658 VerificationType::integer_type(), CHECK_VERIFY(this));
1659 }
1660 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1661 no_control_flow = false; break;
1662 }
1663 case Bytecodes::_athrow :
1664 type = VerificationType::reference_type(
1665 vmSymbols::java_lang_Throwable());
1666 current_frame.pop_stack(type, CHECK_VERIFY(this));
1667 no_control_flow = true; break;
1668 default:
1669 // We only need to check the valid bytecodes in class file.
1670 // And jsr and ret are not in the new class file format in JDK1.5.
1671 verify_error(ErrorContext::bad_code(bci),
1672 "Bad instruction: %02x", opcode);
1673 no_control_flow = false;
1674 return;
1675 } // end switch
1676 } // end Merge with the next instruction
1678 // Look for possible jump target in exception handlers and see if it matches
1679 // current_frame. Don't do this check if it has already been done (for
1680 // ([a,d,f,i,l]store* opcodes). This check cannot be done earlier because
1681 // opcodes, such as invokespecial, may set the this_uninit flag.
1682 assert(!(verified_exc_handlers && this_uninit),
1683 "Exception handler targets got verified before this_uninit got set");
1684 if (!verified_exc_handlers && bci >= ex_min && bci < ex_max) {
1685 verify_exception_handler_targets(
1686 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1687 }
1688 } // end while
1690 // Make sure that control flow does not fall through end of the method
1691 if (!no_control_flow) {
1692 verify_error(ErrorContext::bad_code(code_length),
1693 "Control flow falls through code end");
1694 return;
1695 }
1696 }
1698 #undef bad_type_message
1700 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1701 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1702 memset(code_data, 0, sizeof(char) * code_length);
1703 RawBytecodeStream bcs(m);
1705 while (!bcs.is_last_bytecode()) {
1706 if (bcs.raw_next() != Bytecodes::_illegal) {
1707 int bci = bcs.bci();
1708 if (bcs.raw_code() == Bytecodes::_new) {
1709 code_data[bci] = NEW_OFFSET;
1710 } else {
1711 code_data[bci] = BYTECODE_OFFSET;
1712 }
1713 } else {
1714 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1715 return NULL;
1716 }
1717 }
1719 return code_data;
1720 }
1722 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1723 ExceptionTable exhandlers(_method());
1724 int exlength = exhandlers.length();
1725 constantPoolHandle cp (THREAD, _method->constants());
1727 for(int i = 0; i < exlength; i++) {
1728 //reacquire the table in case a GC happened
1729 ExceptionTable exhandlers(_method());
1730 u2 start_pc = exhandlers.start_pc(i);
1731 u2 end_pc = exhandlers.end_pc(i);
1732 u2 handler_pc = exhandlers.handler_pc(i);
1733 if (start_pc >= code_length || code_data[start_pc] == 0) {
1734 class_format_error("Illegal exception table start_pc %d", start_pc);
1735 return;
1736 }
1737 if (end_pc != code_length) { // special case: end_pc == code_length
1738 if (end_pc > code_length || code_data[end_pc] == 0) {
1739 class_format_error("Illegal exception table end_pc %d", end_pc);
1740 return;
1741 }
1742 }
1743 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1744 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1745 return;
1746 }
1747 int catch_type_index = exhandlers.catch_type_index(i);
1748 if (catch_type_index != 0) {
1749 VerificationType catch_type = cp_index_to_type(
1750 catch_type_index, cp, CHECK_VERIFY(this));
1751 VerificationType throwable =
1752 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1753 bool is_subclass = throwable.is_assignable_from(
1754 catch_type, this, false, CHECK_VERIFY(this));
1755 if (!is_subclass) {
1756 // 4286534: should throw VerifyError according to recent spec change
1757 verify_error(ErrorContext::bad_type(handler_pc,
1758 TypeOrigin::cp(catch_type_index, catch_type),
1759 TypeOrigin::implicit(throwable)),
1760 "Catch type is not a subclass "
1761 "of Throwable in exception handler %d", handler_pc);
1762 return;
1763 }
1764 }
1765 if (start_pc < min) min = start_pc;
1766 if (end_pc > max) max = end_pc;
1767 }
1768 }
1770 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1771 int localvariable_table_length = _method()->localvariable_table_length();
1772 if (localvariable_table_length > 0) {
1773 LocalVariableTableElement* table = _method()->localvariable_table_start();
1774 for (int i = 0; i < localvariable_table_length; i++) {
1775 u2 start_bci = table[i].start_bci;
1776 u2 length = table[i].length;
1778 if (start_bci >= code_length || code_data[start_bci] == 0) {
1779 class_format_error(
1780 "Illegal local variable table start_pc %d", start_bci);
1781 return;
1782 }
1783 u4 end_bci = (u4)(start_bci + length);
1784 if (end_bci != code_length) {
1785 if (end_bci >= code_length || code_data[end_bci] == 0) {
1786 class_format_error( "Illegal local variable table length %d", length);
1787 return;
1788 }
1789 }
1790 }
1791 }
1792 }
1794 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1795 StackMapFrame* current_frame,
1796 StackMapTable* stackmap_table,
1797 bool no_control_flow, TRAPS) {
1798 if (stackmap_index < stackmap_table->get_frame_count()) {
1799 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1800 if (no_control_flow && this_offset > bci) {
1801 verify_error(ErrorContext::missing_stackmap(bci),
1802 "Expecting a stack map frame");
1803 return 0;
1804 }
1805 if (this_offset == bci) {
1806 ErrorContext ctx;
1807 // See if current stack map can be assigned to the frame in table.
1808 // current_frame is the stackmap frame got from the last instruction.
1809 // If matched, current_frame will be updated by this method.
1810 bool matches = stackmap_table->match_stackmap(
1811 current_frame, this_offset, stackmap_index,
1812 !no_control_flow, true, false, &ctx, CHECK_VERIFY_(this, 0));
1813 if (!matches) {
1814 // report type error
1815 verify_error(ctx, "Instruction type does not match stack map");
1816 return 0;
1817 }
1818 stackmap_index++;
1819 } else if (this_offset < bci) {
1820 // current_offset should have met this_offset.
1821 class_format_error("Bad stack map offset %d", this_offset);
1822 return 0;
1823 }
1824 } else if (no_control_flow) {
1825 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1826 return 0;
1827 }
1828 return stackmap_index;
1829 }
1831 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1832 StackMapTable* stackmap_table, TRAPS) {
1833 constantPoolHandle cp (THREAD, _method->constants());
1834 ExceptionTable exhandlers(_method());
1835 int exlength = exhandlers.length();
1836 for(int i = 0; i < exlength; i++) {
1837 //reacquire the table in case a GC happened
1838 ExceptionTable exhandlers(_method());
1839 u2 start_pc = exhandlers.start_pc(i);
1840 u2 end_pc = exhandlers.end_pc(i);
1841 u2 handler_pc = exhandlers.handler_pc(i);
1842 int catch_type_index = exhandlers.catch_type_index(i);
1843 if(bci >= start_pc && bci < end_pc) {
1844 u1 flags = current_frame->flags();
1845 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1846 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1847 if (catch_type_index != 0) {
1848 // We know that this index refers to a subclass of Throwable
1849 VerificationType catch_type = cp_index_to_type(
1850 catch_type_index, cp, CHECK_VERIFY(this));
1851 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1852 } else {
1853 VerificationType throwable =
1854 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1855 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1856 }
1857 ErrorContext ctx;
1858 bool matches = stackmap_table->match_stackmap(
1859 new_frame, handler_pc, true, false, true, &ctx, CHECK_VERIFY(this));
1860 if (!matches) {
1861 verify_error(ctx, "Stack map does not match the one at "
1862 "exception handler %d", handler_pc);
1863 return;
1864 }
1865 }
1866 }
1867 }
1869 void ClassVerifier::verify_cp_index(
1870 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1871 int nconstants = cp->length();
1872 if ((index <= 0) || (index >= nconstants)) {
1873 verify_error(ErrorContext::bad_cp_index(bci, index),
1874 "Illegal constant pool index %d in class %s",
1875 index, cp->pool_holder()->external_name());
1876 return;
1877 }
1878 }
1880 void ClassVerifier::verify_cp_type(
1881 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1883 // In some situations, bytecode rewriting may occur while we're verifying.
1884 // In this case, a constant pool cache exists and some indices refer to that
1885 // instead. Be sure we don't pick up such indices by accident.
1886 // We must check was_recursively_verified() before we get here.
1887 guarantee(cp->cache() == NULL, "not rewritten yet");
1889 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1890 unsigned int tag = cp->tag_at(index).value();
1891 if ((types & (1 << tag)) == 0) {
1892 verify_error(ErrorContext::bad_cp_index(bci, index),
1893 "Illegal type at constant pool entry %d in class %s",
1894 index, cp->pool_holder()->external_name());
1895 return;
1896 }
1897 }
1899 void ClassVerifier::verify_cp_class_type(
1900 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1901 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1902 constantTag tag = cp->tag_at(index);
1903 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1904 verify_error(ErrorContext::bad_cp_index(bci, index),
1905 "Illegal type at constant pool entry %d in class %s",
1906 index, cp->pool_holder()->external_name());
1907 return;
1908 }
1909 }
1911 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1912 stringStream ss;
1914 ctx.reset_frames();
1915 _exception_type = vmSymbols::java_lang_VerifyError();
1916 _error_context = ctx;
1917 va_list va;
1918 va_start(va, msg);
1919 ss.vprint(msg, va);
1920 va_end(va);
1921 _message = ss.as_string();
1922 #ifdef ASSERT
1923 ResourceMark rm;
1924 const char* exception_name = _exception_type->as_C_string();
1925 Exceptions::debug_check_abort(exception_name, NULL);
1926 #endif // ndef ASSERT
1927 }
1929 void ClassVerifier::class_format_error(const char* msg, ...) {
1930 stringStream ss;
1931 _exception_type = vmSymbols::java_lang_ClassFormatError();
1932 va_list va;
1933 va_start(va, msg);
1934 ss.vprint(msg, va);
1935 va_end(va);
1936 if (!_method.is_null()) {
1937 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1938 }
1939 _message = ss.as_string();
1940 }
1942 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1943 // Get current loader and protection domain first.
1944 oop loader = current_class()->class_loader();
1945 oop protection_domain = current_class()->protection_domain();
1947 return SystemDictionary::resolve_or_fail(
1948 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1949 true, CHECK_NULL);
1950 }
1952 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1953 Klass* target_class,
1954 Symbol* field_name,
1955 Symbol* field_sig,
1956 bool is_method) {
1957 No_Safepoint_Verifier nosafepoint;
1959 // If target class isn't a super class of this class, we don't worry about this case
1960 if (!this_class->is_subclass_of(target_class)) {
1961 return false;
1962 }
1963 // Check if the specified method or field is protected
1964 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1965 fieldDescriptor fd;
1966 if (is_method) {
1967 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::normal);
1968 if (m != NULL && m->is_protected()) {
1969 if (!this_class->is_same_class_package(m->method_holder())) {
1970 return true;
1971 }
1972 }
1973 } else {
1974 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1975 if (member_klass != NULL && fd.is_protected()) {
1976 if (!this_class->is_same_class_package(member_klass)) {
1977 return true;
1978 }
1979 }
1980 }
1981 return false;
1982 }
1984 void ClassVerifier::verify_ldc(
1985 int opcode, u2 index, StackMapFrame* current_frame,
1986 constantPoolHandle cp, u2 bci, TRAPS) {
1987 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1988 constantTag tag = cp->tag_at(index);
1989 unsigned int types;
1990 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1991 if (!tag.is_unresolved_klass()) {
1992 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1993 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1994 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1995 // Note: The class file parser already verified the legality of
1996 // MethodHandle and MethodType constants.
1997 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1998 }
1999 } else {
2000 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
2001 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
2002 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
2003 }
2004 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
2005 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
2006 } else if (tag.is_string()) {
2007 current_frame->push_stack(
2008 VerificationType::reference_type(
2009 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
2010 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
2011 current_frame->push_stack(
2012 VerificationType::reference_type(
2013 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
2014 } else if (tag.is_int()) {
2015 current_frame->push_stack(
2016 VerificationType::integer_type(), CHECK_VERIFY(this));
2017 } else if (tag.is_float()) {
2018 current_frame->push_stack(
2019 VerificationType::float_type(), CHECK_VERIFY(this));
2020 } else if (tag.is_double()) {
2021 current_frame->push_stack_2(
2022 VerificationType::double_type(),
2023 VerificationType::double2_type(), CHECK_VERIFY(this));
2024 } else if (tag.is_long()) {
2025 current_frame->push_stack_2(
2026 VerificationType::long_type(),
2027 VerificationType::long2_type(), CHECK_VERIFY(this));
2028 } else if (tag.is_method_handle()) {
2029 current_frame->push_stack(
2030 VerificationType::reference_type(
2031 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2032 } else if (tag.is_method_type()) {
2033 current_frame->push_stack(
2034 VerificationType::reference_type(
2035 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2036 } else {
2037 /* Unreachable? verify_cp_type has already validated the cp type. */
2038 verify_error(
2039 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2040 return;
2041 }
2042 }
2044 void ClassVerifier::verify_switch(
2045 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2046 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2047 int bci = bcs->bci();
2048 address bcp = bcs->bcp();
2049 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2051 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2052 // 4639449 & 4647081: padding bytes must be 0
2053 u2 padding_offset = 1;
2054 while ((bcp + padding_offset) < aligned_bcp) {
2055 if(*(bcp + padding_offset) != 0) {
2056 verify_error(ErrorContext::bad_code(bci),
2057 "Nonzero padding byte in lookswitch or tableswitch");
2058 return;
2059 }
2060 padding_offset++;
2061 }
2062 }
2064 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2065 int keys, delta;
2066 current_frame->pop_stack(
2067 VerificationType::integer_type(), CHECK_VERIFY(this));
2068 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2069 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2070 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2071 if (low > high) {
2072 verify_error(ErrorContext::bad_code(bci),
2073 "low must be less than or equal to high in tableswitch");
2074 return;
2075 }
2076 keys = high - low + 1;
2077 if (keys < 0) {
2078 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2079 return;
2080 }
2081 delta = 1;
2082 } else {
2083 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2084 if (keys < 0) {
2085 verify_error(ErrorContext::bad_code(bci),
2086 "number of keys in lookupswitch less than 0");
2087 return;
2088 }
2089 delta = 2;
2090 // Make sure that the lookupswitch items are sorted
2091 for (int i = 0; i < (keys - 1); i++) {
2092 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2093 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2094 if (this_key >= next_key) {
2095 verify_error(ErrorContext::bad_code(bci),
2096 "Bad lookupswitch instruction");
2097 return;
2098 }
2099 }
2100 }
2101 int target = bci + default_offset;
2102 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2103 for (int i = 0; i < keys; i++) {
2104 // Because check_jump_target() may safepoint, the bytecode could have
2105 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2106 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2107 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2108 stackmap_table->check_jump_target(
2109 current_frame, target, CHECK_VERIFY(this));
2110 }
2111 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2112 }
2114 bool ClassVerifier::name_in_supers(
2115 Symbol* ref_name, instanceKlassHandle current) {
2116 Klass* super = current->super();
2117 while (super != NULL) {
2118 if (super->name() == ref_name) {
2119 return true;
2120 }
2121 super = super->super();
2122 }
2123 return false;
2124 }
2126 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2127 StackMapFrame* current_frame,
2128 constantPoolHandle cp,
2129 TRAPS) {
2130 u2 index = bcs->get_index_u2();
2131 verify_cp_type(bcs->bci(), index, cp,
2132 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2134 // Get field name and signature
2135 Symbol* field_name = cp->name_ref_at(index);
2136 Symbol* field_sig = cp->signature_ref_at(index);
2138 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2139 class_format_error(
2140 "Invalid signature for field in class %s referenced "
2141 "from constant pool index %d", _klass->external_name(), index);
2142 return;
2143 }
2145 // Get referenced class type
2146 VerificationType ref_class_type = cp_ref_index_to_type(
2147 index, cp, CHECK_VERIFY(this));
2148 if (!ref_class_type.is_object()) {
2149 /* Unreachable? Class file parser verifies Fieldref contents */
2150 verify_error(ErrorContext::bad_type(bcs->bci(),
2151 TypeOrigin::cp(index, ref_class_type)),
2152 "Expecting reference to class in class %s at constant pool index %d",
2153 _klass->external_name(), index);
2154 return;
2155 }
2156 VerificationType target_class_type = ref_class_type;
2158 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2159 "buffer type must match VerificationType size");
2160 uintptr_t field_type_buffer[2];
2161 VerificationType* field_type = (VerificationType*)field_type_buffer;
2162 // If we make a VerificationType[2] array directly, the compiler calls
2163 // to the c-runtime library to do the allocation instead of just
2164 // stack allocating it. Plus it would run constructors. This shows up
2165 // in performance profiles.
2167 SignatureStream sig_stream(field_sig, false);
2168 VerificationType stack_object_type;
2169 int n = change_sig_to_verificationType(
2170 &sig_stream, field_type, CHECK_VERIFY(this));
2171 u2 bci = bcs->bci();
2172 bool is_assignable;
2173 switch (bcs->raw_code()) {
2174 case Bytecodes::_getstatic: {
2175 for (int i = 0; i < n; i++) {
2176 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2177 }
2178 break;
2179 }
2180 case Bytecodes::_putstatic: {
2181 for (int i = n - 1; i >= 0; i--) {
2182 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2183 }
2184 break;
2185 }
2186 case Bytecodes::_getfield: {
2187 stack_object_type = current_frame->pop_stack(
2188 target_class_type, CHECK_VERIFY(this));
2189 for (int i = 0; i < n; i++) {
2190 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2191 }
2192 goto check_protected;
2193 }
2194 case Bytecodes::_putfield: {
2195 for (int i = n - 1; i >= 0; i--) {
2196 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2197 }
2198 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2200 // The JVMS 2nd edition allows field initialization before the superclass
2201 // initializer, if the field is defined within the current class.
2202 fieldDescriptor fd;
2203 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2204 target_class_type.equals(current_type()) &&
2205 _klass->find_local_field(field_name, field_sig, &fd)) {
2206 stack_object_type = current_type();
2207 }
2208 is_assignable = target_class_type.is_assignable_from(
2209 stack_object_type, this, false, CHECK_VERIFY(this));
2210 if (!is_assignable) {
2211 verify_error(ErrorContext::bad_type(bci,
2212 current_frame->stack_top_ctx(),
2213 TypeOrigin::cp(index, target_class_type)),
2214 "Bad type on operand stack in putfield");
2215 return;
2216 }
2217 }
2218 check_protected: {
2219 if (_this_type == stack_object_type)
2220 break; // stack_object_type must be assignable to _current_class_type
2221 Symbol* ref_class_name =
2222 cp->klass_name_at(cp->klass_ref_index_at(index));
2223 if (!name_in_supers(ref_class_name, current_class()))
2224 // stack_object_type must be assignable to _current_class_type since:
2225 // 1. stack_object_type must be assignable to ref_class.
2226 // 2. ref_class must be _current_class or a subclass of it. It can't
2227 // be a superclass of it. See revised JVMS 5.4.4.
2228 break;
2230 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2231 if (is_protected_access(current_class(), ref_class_oop, field_name,
2232 field_sig, false)) {
2233 // It's protected access, check if stack object is assignable to
2234 // current class.
2235 is_assignable = current_type().is_assignable_from(
2236 stack_object_type, this, true, CHECK_VERIFY(this));
2237 if (!is_assignable) {
2238 verify_error(ErrorContext::bad_type(bci,
2239 current_frame->stack_top_ctx(),
2240 TypeOrigin::implicit(current_type())),
2241 "Bad access to protected data in getfield");
2242 return;
2243 }
2244 }
2245 break;
2246 }
2247 default: ShouldNotReachHere();
2248 }
2249 }
2251 // Look at the method's handlers. If the bci is in the handler's try block
2252 // then check if the handler_pc is already on the stack. If not, push it
2253 // unless the handler has already been scanned.
2254 void ClassVerifier::push_handlers(ExceptionTable* exhandlers,
2255 GrowableArray<u4>* handler_list,
2256 GrowableArray<u4>* handler_stack,
2257 u4 bci) {
2258 int exlength = exhandlers->length();
2259 for(int x = 0; x < exlength; x++) {
2260 if (bci >= exhandlers->start_pc(x) && bci < exhandlers->end_pc(x)) {
2261 u4 exhandler_pc = exhandlers->handler_pc(x);
2262 if (!handler_list->contains(exhandler_pc)) {
2263 handler_stack->append_if_missing(exhandler_pc);
2264 handler_list->append(exhandler_pc);
2265 }
2266 }
2267 }
2268 }
2270 // Return TRUE if all code paths starting with start_bc_offset end in
2271 // bytecode athrow or loop.
2272 bool ClassVerifier::ends_in_athrow(u4 start_bc_offset) {
2273 ResourceMark rm;
2274 // Create bytecode stream.
2275 RawBytecodeStream bcs(method());
2276 u4 code_length = method()->code_size();
2277 bcs.set_start(start_bc_offset);
2278 u4 target;
2279 // Create stack for storing bytecode start offsets for if* and *switch.
2280 GrowableArray<u4>* bci_stack = new GrowableArray<u4>(30);
2281 // Create stack for handlers for try blocks containing this handler.
2282 GrowableArray<u4>* handler_stack = new GrowableArray<u4>(30);
2283 // Create list of handlers that have been pushed onto the handler_stack
2284 // so that handlers embedded inside of their own TRY blocks only get
2285 // scanned once.
2286 GrowableArray<u4>* handler_list = new GrowableArray<u4>(30);
2287 // Create list of visited branch opcodes (goto* and if*).
2288 GrowableArray<u4>* visited_branches = new GrowableArray<u4>(30);
2289 ExceptionTable exhandlers(_method());
2291 while (true) {
2292 if (bcs.is_last_bytecode()) {
2293 // if no more starting offsets to parse or if at the end of the
2294 // method then return false.
2295 if ((bci_stack->is_empty()) || ((u4)bcs.end_bci() == code_length))
2296 return false;
2297 // Pop a bytecode starting offset and scan from there.
2298 bcs.set_start(bci_stack->pop());
2299 }
2300 Bytecodes::Code opcode = bcs.raw_next();
2301 u4 bci = bcs.bci();
2303 // If the bytecode is in a TRY block, push its handlers so they
2304 // will get parsed.
2305 push_handlers(&exhandlers, handler_list, handler_stack, bci);
2307 switch (opcode) {
2308 case Bytecodes::_if_icmpeq:
2309 case Bytecodes::_if_icmpne:
2310 case Bytecodes::_if_icmplt:
2311 case Bytecodes::_if_icmpge:
2312 case Bytecodes::_if_icmpgt:
2313 case Bytecodes::_if_icmple:
2314 case Bytecodes::_ifeq:
2315 case Bytecodes::_ifne:
2316 case Bytecodes::_iflt:
2317 case Bytecodes::_ifge:
2318 case Bytecodes::_ifgt:
2319 case Bytecodes::_ifle:
2320 case Bytecodes::_if_acmpeq:
2321 case Bytecodes::_if_acmpne:
2322 case Bytecodes::_ifnull:
2323 case Bytecodes::_ifnonnull:
2324 target = bcs.dest();
2325 if (visited_branches->contains(bci)) {
2326 if (bci_stack->is_empty()) return true;
2327 // Pop a bytecode starting offset and scan from there.
2328 bcs.set_start(bci_stack->pop());
2329 } else {
2330 if (target > bci) { // forward branch
2331 if (target >= code_length) return false;
2332 // Push the branch target onto the stack.
2333 bci_stack->push(target);
2334 // then, scan bytecodes starting with next.
2335 bcs.set_start(bcs.next_bci());
2336 } else { // backward branch
2337 // Push bytecode offset following backward branch onto the stack.
2338 bci_stack->push(bcs.next_bci());
2339 // Check bytecodes starting with branch target.
2340 bcs.set_start(target);
2341 }
2342 // Record target so we don't branch here again.
2343 visited_branches->append(bci);
2344 }
2345 break;
2347 case Bytecodes::_goto:
2348 case Bytecodes::_goto_w:
2349 target = (opcode == Bytecodes::_goto ? bcs.dest() : bcs.dest_w());
2350 if (visited_branches->contains(bci)) {
2351 if (bci_stack->is_empty()) return true;
2352 // Been here before, pop new starting offset from stack.
2353 bcs.set_start(bci_stack->pop());
2354 } else {
2355 if (target >= code_length) return false;
2356 // Continue scanning from the target onward.
2357 bcs.set_start(target);
2358 // Record target so we don't branch here again.
2359 visited_branches->append(bci);
2360 }
2361 break;
2363 // Check that all switch alternatives end in 'athrow' bytecodes. Since it
2364 // is difficult to determine where each switch alternative ends, parse
2365 // each switch alternative until either hit a 'return', 'athrow', or reach
2366 // the end of the method's bytecodes. This is gross but should be okay
2367 // because:
2368 // 1. tableswitch and lookupswitch byte codes in handlers for ctor explicit
2369 // constructor invocations should be rare.
2370 // 2. if each switch alternative ends in an athrow then the parsing should be
2371 // short. If there is no athrow then it is bogus code, anyway.
2372 case Bytecodes::_lookupswitch:
2373 case Bytecodes::_tableswitch:
2374 {
2375 address aligned_bcp = (address) round_to((intptr_t)(bcs.bcp() + 1), jintSize);
2376 u4 default_offset = Bytes::get_Java_u4(aligned_bcp) + bci;
2377 int keys, delta;
2378 if (opcode == Bytecodes::_tableswitch) {
2379 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2380 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2381 // This is invalid, but let the regular bytecode verifier
2382 // report this because the user will get a better error message.
2383 if (low > high) return true;
2384 keys = high - low + 1;
2385 delta = 1;
2386 } else {
2387 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2388 delta = 2;
2389 }
2390 // Invalid, let the regular bytecode verifier deal with it.
2391 if (keys < 0) return true;
2393 // Push the offset of the next bytecode onto the stack.
2394 bci_stack->push(bcs.next_bci());
2396 // Push the switch alternatives onto the stack.
2397 for (int i = 0; i < keys; i++) {
2398 u4 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2399 if (target > code_length) return false;
2400 bci_stack->push(target);
2401 }
2403 // Start bytecode parsing for the switch at the default alternative.
2404 if (default_offset > code_length) return false;
2405 bcs.set_start(default_offset);
2406 break;
2407 }
2409 case Bytecodes::_return:
2410 return false;
2412 case Bytecodes::_athrow:
2413 {
2414 if (bci_stack->is_empty()) {
2415 if (handler_stack->is_empty()) {
2416 return true;
2417 } else {
2418 // Parse the catch handlers for try blocks containing athrow.
2419 bcs.set_start(handler_stack->pop());
2420 }
2421 } else {
2422 // Pop a bytecode offset and starting scanning from there.
2423 bcs.set_start(bci_stack->pop());
2424 }
2425 }
2426 break;
2428 default:
2429 ;
2430 } // end switch
2431 } // end while loop
2433 return false;
2434 }
2436 void ClassVerifier::verify_invoke_init(
2437 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2438 StackMapFrame* current_frame, u4 code_length, bool in_try_block,
2439 bool *this_uninit, constantPoolHandle cp, StackMapTable* stackmap_table,
2440 TRAPS) {
2441 u2 bci = bcs->bci();
2442 VerificationType type = current_frame->pop_stack(
2443 VerificationType::reference_check(), CHECK_VERIFY(this));
2444 if (type == VerificationType::uninitialized_this_type()) {
2445 // The method must be an <init> method of this class or its superclass
2446 Klass* superk = current_class()->super();
2447 if (ref_class_type.name() != current_class()->name() &&
2448 ref_class_type.name() != superk->name()) {
2449 verify_error(ErrorContext::bad_type(bci,
2450 TypeOrigin::implicit(ref_class_type),
2451 TypeOrigin::implicit(current_type())),
2452 "Bad <init> method call");
2453 return;
2454 }
2456 // If this invokespecial call is done from inside of a TRY block then make
2457 // sure that all catch clause paths end in a throw. Otherwise, this can
2458 // result in returning an incomplete object.
2459 if (in_try_block) {
2460 ExceptionTable exhandlers(_method());
2461 int exlength = exhandlers.length();
2462 for(int i = 0; i < exlength; i++) {
2463 u2 start_pc = exhandlers.start_pc(i);
2464 u2 end_pc = exhandlers.end_pc(i);
2466 if (bci >= start_pc && bci < end_pc) {
2467 if (!ends_in_athrow(exhandlers.handler_pc(i))) {
2468 verify_error(ErrorContext::bad_code(bci),
2469 "Bad <init> method call from after the start of a try block");
2470 return;
2471 } else if (VerboseVerification) {
2472 ResourceMark rm;
2473 tty->print_cr(
2474 "Survived call to ends_in_athrow(): %s",
2475 current_class()->name()->as_C_string());
2476 }
2477 }
2478 }
2480 // Check the exception handler target stackmaps with the locals from the
2481 // incoming stackmap (before initialize_object() changes them to outgoing
2482 // state).
2483 verify_exception_handler_targets(bci, true, current_frame,
2484 stackmap_table, CHECK_VERIFY(this));
2485 } // in_try_block
2487 current_frame->initialize_object(type, current_type());
2488 *this_uninit = true;
2489 } else if (type.is_uninitialized()) {
2490 u2 new_offset = type.bci();
2491 address new_bcp = bcs->bcp() - bci + new_offset;
2492 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2493 /* Unreachable? Stack map parsing ensures valid type and new
2494 * instructions have a valid BCI. */
2495 verify_error(ErrorContext::bad_code(new_offset),
2496 "Expecting new instruction");
2497 return;
2498 }
2499 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2500 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2502 // The method must be an <init> method of the indicated class
2503 VerificationType new_class_type = cp_index_to_type(
2504 new_class_index, cp, CHECK_VERIFY(this));
2505 if (!new_class_type.equals(ref_class_type)) {
2506 verify_error(ErrorContext::bad_type(bci,
2507 TypeOrigin::cp(new_class_index, new_class_type),
2508 TypeOrigin::cp(ref_class_index, ref_class_type)),
2509 "Call to wrong <init> method");
2510 return;
2511 }
2512 // According to the VM spec, if the referent class is a superclass of the
2513 // current class, and is in a different runtime package, and the method is
2514 // protected, then the objectref must be the current class or a subclass
2515 // of the current class.
2516 VerificationType objectref_type = new_class_type;
2517 if (name_in_supers(ref_class_type.name(), current_class())) {
2518 Klass* ref_klass = load_class(ref_class_type.name(), CHECK);
2519 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2520 vmSymbols::object_initializer_name(),
2521 cp->signature_ref_at(bcs->get_index_u2()), Klass::normal);
2522 // Do nothing if method is not found. Let resolution detect the error.
2523 if (m != NULL) {
2524 instanceKlassHandle mh(THREAD, m->method_holder());
2525 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2526 bool assignable = current_type().is_assignable_from(
2527 objectref_type, this, true, CHECK_VERIFY(this));
2528 if (!assignable) {
2529 verify_error(ErrorContext::bad_type(bci,
2530 TypeOrigin::cp(new_class_index, objectref_type),
2531 TypeOrigin::implicit(current_type())),
2532 "Bad access to protected <init> method");
2533 return;
2534 }
2535 }
2536 }
2537 }
2538 // Check the exception handler target stackmaps with the locals from the
2539 // incoming stackmap (before initialize_object() changes them to outgoing
2540 // state).
2541 if (in_try_block) {
2542 verify_exception_handler_targets(bci, *this_uninit, current_frame,
2543 stackmap_table, CHECK_VERIFY(this));
2544 }
2545 current_frame->initialize_object(type, new_class_type);
2546 } else {
2547 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2548 "Bad operand type when invoking <init>");
2549 return;
2550 }
2551 }
2553 bool ClassVerifier::is_same_or_direct_interface(
2554 instanceKlassHandle klass,
2555 VerificationType klass_type,
2556 VerificationType ref_class_type) {
2557 if (ref_class_type.equals(klass_type)) return true;
2558 Array<Klass*>* local_interfaces = klass->local_interfaces();
2559 if (local_interfaces != NULL) {
2560 for (int x = 0; x < local_interfaces->length(); x++) {
2561 Klass* k = local_interfaces->at(x);
2562 assert (k != NULL && k->is_interface(), "invalid interface");
2563 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2564 return true;
2565 }
2566 }
2567 }
2568 return false;
2569 }
2571 void ClassVerifier::verify_invoke_instructions(
2572 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2573 bool in_try_block, bool *this_uninit, VerificationType return_type,
2574 constantPoolHandle cp, StackMapTable* stackmap_table, TRAPS) {
2575 // Make sure the constant pool item is the right type
2576 u2 index = bcs->get_index_u2();
2577 Bytecodes::Code opcode = bcs->raw_code();
2578 unsigned int types;
2579 switch (opcode) {
2580 case Bytecodes::_invokeinterface:
2581 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2582 break;
2583 case Bytecodes::_invokedynamic:
2584 types = 1 << JVM_CONSTANT_InvokeDynamic;
2585 break;
2586 case Bytecodes::_invokespecial:
2587 case Bytecodes::_invokestatic:
2588 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2589 (1 << JVM_CONSTANT_Methodref) :
2590 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2591 break;
2592 default:
2593 types = 1 << JVM_CONSTANT_Methodref;
2594 }
2595 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2597 // Get method name and signature
2598 Symbol* method_name = cp->name_ref_at(index);
2599 Symbol* method_sig = cp->signature_ref_at(index);
2601 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2602 class_format_error(
2603 "Invalid method signature in class %s referenced "
2604 "from constant pool index %d", _klass->external_name(), index);
2605 return;
2606 }
2608 // Get referenced class type
2609 VerificationType ref_class_type;
2610 if (opcode == Bytecodes::_invokedynamic) {
2611 if (!EnableInvokeDynamic ||
2612 _klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2613 if (!EnableInvokeDynamic) {
2614 class_format_error("invokedynamic instructions not enabled in this JVM");
2615 } else {
2616 class_format_error("invokedynamic instructions not supported by this class file version (%d), class %s",
2617 _klass->major_version(), _klass->external_name());
2618 }
2619 return;
2620 }
2621 } else {
2622 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2623 }
2625 // For a small signature length, we just allocate 128 bytes instead
2626 // of parsing the signature once to find its size.
2627 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2628 // longs/doubles to be consertive.
2629 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2630 "buffer type must match VerificationType size");
2631 uintptr_t on_stack_sig_types_buffer[128];
2632 // If we make a VerificationType[128] array directly, the compiler calls
2633 // to the c-runtime library to do the allocation instead of just
2634 // stack allocating it. Plus it would run constructors. This shows up
2635 // in performance profiles.
2637 VerificationType* sig_types;
2638 int size = (method_sig->utf8_length() - 3) * 2;
2639 if (size > 128) {
2640 // Long and double occupies two slots here.
2641 ArgumentSizeComputer size_it(method_sig);
2642 size = size_it.size();
2643 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2644 } else{
2645 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2646 }
2647 SignatureStream sig_stream(method_sig);
2648 int sig_i = 0;
2649 while (!sig_stream.at_return_type()) {
2650 sig_i += change_sig_to_verificationType(
2651 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2652 sig_stream.next();
2653 }
2654 int nargs = sig_i;
2656 #ifdef ASSERT
2657 {
2658 ArgumentSizeComputer size_it(method_sig);
2659 assert(nargs == size_it.size(), "Argument sizes do not match");
2660 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2661 }
2662 #endif
2664 // Check instruction operands
2665 u2 bci = bcs->bci();
2666 if (opcode == Bytecodes::_invokeinterface) {
2667 address bcp = bcs->bcp();
2668 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2669 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2670 // the difference between the size of the operand stack before and after the instruction
2671 // executes.
2672 if (*(bcp+3) != (nargs+1)) {
2673 verify_error(ErrorContext::bad_code(bci),
2674 "Inconsistent args count operand in invokeinterface");
2675 return;
2676 }
2677 if (*(bcp+4) != 0) {
2678 verify_error(ErrorContext::bad_code(bci),
2679 "Fourth operand byte of invokeinterface must be zero");
2680 return;
2681 }
2682 }
2684 if (opcode == Bytecodes::_invokedynamic) {
2685 address bcp = bcs->bcp();
2686 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2687 verify_error(ErrorContext::bad_code(bci),
2688 "Third and fourth operand bytes of invokedynamic must be zero");
2689 return;
2690 }
2691 }
2693 if (method_name->byte_at(0) == '<') {
2694 // Make sure <init> can only be invoked by invokespecial
2695 if (opcode != Bytecodes::_invokespecial ||
2696 method_name != vmSymbols::object_initializer_name()) {
2697 verify_error(ErrorContext::bad_code(bci),
2698 "Illegal call to internal method");
2699 return;
2700 }
2701 } else if (opcode == Bytecodes::_invokespecial
2702 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2703 && !ref_class_type.equals(VerificationType::reference_type(
2704 current_class()->super()->name()))) {
2705 bool subtype = false;
2706 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2707 if (!current_class()->is_anonymous()) {
2708 subtype = ref_class_type.is_assignable_from(
2709 current_type(), this, false, CHECK_VERIFY(this));
2710 } else {
2711 VerificationType host_klass_type =
2712 VerificationType::reference_type(current_class()->host_klass()->name());
2713 subtype = ref_class_type.is_assignable_from(host_klass_type, this, false, CHECK_VERIFY(this));
2715 // If invokespecial of IMR, need to recheck for same or
2716 // direct interface relative to the host class
2717 have_imr_indirect = (have_imr_indirect &&
2718 !is_same_or_direct_interface(
2719 InstanceKlass::cast(current_class()->host_klass()),
2720 host_klass_type, ref_class_type));
2721 }
2722 if (!subtype) {
2723 verify_error(ErrorContext::bad_code(bci),
2724 "Bad invokespecial instruction: "
2725 "current class isn't assignable to reference class.");
2726 return;
2727 } else if (have_imr_indirect) {
2728 verify_error(ErrorContext::bad_code(bci),
2729 "Bad invokespecial instruction: "
2730 "interface method reference is in an indirect superinterface.");
2731 return;
2732 }
2734 }
2735 // Match method descriptor with operand stack
2736 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2737 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2738 }
2739 // Check objectref on operand stack
2740 if (opcode != Bytecodes::_invokestatic &&
2741 opcode != Bytecodes::_invokedynamic) {
2742 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2743 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2744 code_length, in_try_block, this_uninit, cp, stackmap_table,
2745 CHECK_VERIFY(this));
2746 } else { // other methods
2747 // Ensures that target class is assignable to method class.
2748 if (opcode == Bytecodes::_invokespecial) {
2749 if (!current_class()->is_anonymous()) {
2750 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2751 } else {
2752 // anonymous class invokespecial calls: check if the
2753 // objectref is a subtype of the host_klass of the current class
2754 // to allow an anonymous class to reference methods in the host_klass
2755 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2756 VerificationType hosttype =
2757 VerificationType::reference_type(current_class()->host_klass()->name());
2758 bool subtype = hosttype.is_assignable_from(top, this, false, CHECK_VERIFY(this));
2759 if (!subtype) {
2760 verify_error( ErrorContext::bad_type(current_frame->offset(),
2761 current_frame->stack_top_ctx(),
2762 TypeOrigin::implicit(top)),
2763 "Bad type on operand stack");
2764 return;
2765 }
2766 }
2767 } else if (opcode == Bytecodes::_invokevirtual) {
2768 VerificationType stack_object_type =
2769 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2770 if (current_type() != stack_object_type) {
2771 assert(cp->cache() == NULL, "not rewritten yet");
2772 Symbol* ref_class_name =
2773 cp->klass_name_at(cp->klass_ref_index_at(index));
2774 // See the comments in verify_field_instructions() for
2775 // the rationale behind this.
2776 if (name_in_supers(ref_class_name, current_class())) {
2777 Klass* ref_class = load_class(ref_class_name, CHECK);
2778 if (is_protected_access(
2779 _klass, ref_class, method_name, method_sig, true)) {
2780 // It's protected access, check if stack object is
2781 // assignable to current class.
2782 bool is_assignable = current_type().is_assignable_from(
2783 stack_object_type, this, true, CHECK_VERIFY(this));
2784 if (!is_assignable) {
2785 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2786 && stack_object_type.is_array()
2787 && method_name == vmSymbols::clone_name()) {
2788 // Special case: arrays pretend to implement public Object
2789 // clone().
2790 } else {
2791 verify_error(ErrorContext::bad_type(bci,
2792 current_frame->stack_top_ctx(),
2793 TypeOrigin::implicit(current_type())),
2794 "Bad access to protected data in invokevirtual");
2795 return;
2796 }
2797 }
2798 }
2799 }
2800 }
2801 } else {
2802 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2803 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2804 }
2805 }
2806 }
2807 // Push the result type.
2808 if (sig_stream.type() != T_VOID) {
2809 if (method_name == vmSymbols::object_initializer_name()) {
2810 // <init> method must have a void return type
2811 /* Unreachable? Class file parser verifies that methods with '<' have
2812 * void return */
2813 verify_error(ErrorContext::bad_code(bci),
2814 "Return type must be void in <init> method");
2815 return;
2816 }
2817 VerificationType return_type[2];
2818 int n = change_sig_to_verificationType(
2819 &sig_stream, return_type, CHECK_VERIFY(this));
2820 for (int i = 0; i < n; i++) {
2821 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2822 }
2823 }
2824 }
2826 VerificationType ClassVerifier::get_newarray_type(
2827 u2 index, u2 bci, TRAPS) {
2828 const char* from_bt[] = {
2829 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2830 };
2831 if (index < T_BOOLEAN || index > T_LONG) {
2832 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2833 return VerificationType::bogus_type();
2834 }
2836 // from_bt[index] contains the array signature which has a length of 2
2837 Symbol* sig = create_temporary_symbol(
2838 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2839 return VerificationType::reference_type(sig);
2840 }
2842 void ClassVerifier::verify_anewarray(
2843 u2 bci, u2 index, constantPoolHandle cp,
2844 StackMapFrame* current_frame, TRAPS) {
2845 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2846 current_frame->pop_stack(
2847 VerificationType::integer_type(), CHECK_VERIFY(this));
2849 VerificationType component_type =
2850 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2851 int length;
2852 char* arr_sig_str;
2853 if (component_type.is_array()) { // it's an array
2854 const char* component_name = component_type.name()->as_utf8();
2855 // add one dimension to component
2856 length = (int)strlen(component_name) + 1;
2857 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2858 arr_sig_str[0] = '[';
2859 strncpy(&arr_sig_str[1], component_name, length - 1);
2860 } else { // it's an object or interface
2861 const char* component_name = component_type.name()->as_utf8();
2862 // add one dimension to component with 'L' prepended and ';' postpended.
2863 length = (int)strlen(component_name) + 3;
2864 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2865 arr_sig_str[0] = '[';
2866 arr_sig_str[1] = 'L';
2867 strncpy(&arr_sig_str[2], component_name, length - 2);
2868 arr_sig_str[length - 1] = ';';
2869 }
2870 Symbol* arr_sig = create_temporary_symbol(
2871 arr_sig_str, length, CHECK_VERIFY(this));
2872 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2873 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2874 }
2876 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2877 current_frame->get_local(
2878 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2879 current_frame->push_stack(
2880 VerificationType::integer_type(), CHECK_VERIFY(this));
2881 }
2883 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2884 current_frame->get_local_2(
2885 index, VerificationType::long_type(),
2886 VerificationType::long2_type(), CHECK_VERIFY(this));
2887 current_frame->push_stack_2(
2888 VerificationType::long_type(),
2889 VerificationType::long2_type(), CHECK_VERIFY(this));
2890 }
2892 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2893 current_frame->get_local(
2894 index, VerificationType::float_type(), CHECK_VERIFY(this));
2895 current_frame->push_stack(
2896 VerificationType::float_type(), CHECK_VERIFY(this));
2897 }
2899 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2900 current_frame->get_local_2(
2901 index, VerificationType::double_type(),
2902 VerificationType::double2_type(), CHECK_VERIFY(this));
2903 current_frame->push_stack_2(
2904 VerificationType::double_type(),
2905 VerificationType::double2_type(), CHECK_VERIFY(this));
2906 }
2908 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2909 VerificationType type = current_frame->get_local(
2910 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2911 current_frame->push_stack(type, CHECK_VERIFY(this));
2912 }
2914 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2915 current_frame->pop_stack(
2916 VerificationType::integer_type(), CHECK_VERIFY(this));
2917 current_frame->set_local(
2918 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2919 }
2921 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2922 current_frame->pop_stack_2(
2923 VerificationType::long2_type(),
2924 VerificationType::long_type(), CHECK_VERIFY(this));
2925 current_frame->set_local_2(
2926 index, VerificationType::long_type(),
2927 VerificationType::long2_type(), CHECK_VERIFY(this));
2928 }
2930 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2931 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2932 current_frame->set_local(
2933 index, VerificationType::float_type(), CHECK_VERIFY(this));
2934 }
2936 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2937 current_frame->pop_stack_2(
2938 VerificationType::double2_type(),
2939 VerificationType::double_type(), CHECK_VERIFY(this));
2940 current_frame->set_local_2(
2941 index, VerificationType::double_type(),
2942 VerificationType::double2_type(), CHECK_VERIFY(this));
2943 }
2945 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2946 VerificationType type = current_frame->pop_stack(
2947 VerificationType::reference_check(), CHECK_VERIFY(this));
2948 current_frame->set_local(index, type, CHECK_VERIFY(this));
2949 }
2951 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2952 VerificationType type = current_frame->get_local(
2953 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2954 current_frame->set_local(index, type, CHECK_VERIFY(this));
2955 }
2957 void ClassVerifier::verify_return_value(
2958 VerificationType return_type, VerificationType type, u2 bci,
2959 StackMapFrame* current_frame, TRAPS) {
2960 if (return_type == VerificationType::bogus_type()) {
2961 verify_error(ErrorContext::bad_type(bci,
2962 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2963 "Method expects a return value");
2964 return;
2965 }
2966 bool match = return_type.is_assignable_from(type, this, false, CHECK_VERIFY(this));
2967 if (!match) {
2968 verify_error(ErrorContext::bad_type(bci,
2969 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2970 "Bad return type");
2971 return;
2972 }
2973 }
2975 // The verifier creates symbols which are substrings of Symbols.
2976 // These are stored in the verifier until the end of verification so that
2977 // they can be reference counted.
2978 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2979 int end, TRAPS) {
2980 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2981 _symbols->push(sym);
2982 return sym;
2983 }
2985 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2986 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2987 _symbols->push(sym);
2988 return sym;
2989 }