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src/share/vm/classfile/verifier.cpp@710a3c8b516e
src/share/vm/classfile/verifier.cpp
Tue, 08 Aug 2017 15:57:29 +0800
- author
- aoqi
- date
- Tue, 08 Aug 2017 15:57:29 +0800
- changeset 6876
- 710a3c8b516e
- parent 6871
- 077483254bf6
- parent 1
- 2d8a650513c2
- child 7535
- 7ae4e26cb1e0
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merge
1 /*
2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #include "precompiled.hpp"
32 #include "classfile/classFileStream.hpp"
33 #include "classfile/javaClasses.hpp"
34 #include "classfile/stackMapTable.hpp"
35 #include "classfile/stackMapFrame.hpp"
36 #include "classfile/stackMapTableFormat.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "interpreter/bytecodes.hpp"
41 #include "interpreter/bytecodeStream.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "oops/typeArrayOop.hpp"
47 #include "prims/jvm.h"
48 #include "runtime/fieldDescriptor.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/interfaceSupport.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/orderAccess.hpp"
53 #include "runtime/os.hpp"
54 #ifdef TARGET_ARCH_x86
55 # include "bytes_x86.hpp"
56 #endif
57 #ifdef TARGET_ARCH_mips
58 # include "bytes_mips.hpp"
59 #endif
60 #ifdef TARGET_ARCH_sparc
61 # include "bytes_sparc.hpp"
62 #endif
63 #ifdef TARGET_ARCH_zero
64 # include "bytes_zero.hpp"
65 #endif
66 #ifdef TARGET_ARCH_arm
67 # include "bytes_arm.hpp"
68 #endif
69 #ifdef TARGET_ARCH_ppc
70 # include "bytes_ppc.hpp"
71 #endif
73 #define NOFAILOVER_MAJOR_VERSION 51
74 #define NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION 51
75 #define STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION 52
77 // Access to external entry for VerifyClassCodes - old byte code verifier
79 extern "C" {
80 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
81 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
82 }
84 static void* volatile _verify_byte_codes_fn = NULL;
86 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
88 static void* verify_byte_codes_fn() {
89 if (_verify_byte_codes_fn == NULL) {
90 void *lib_handle = os::native_java_library();
91 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
92 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
93 if (func == NULL) {
94 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
95 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
96 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
97 }
98 }
99 return (void*)_verify_byte_codes_fn;
100 }
103 // Methods in Verifier
105 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
106 return (class_loader == NULL || !should_verify_class) ?
107 BytecodeVerificationLocal : BytecodeVerificationRemote;
108 }
110 bool Verifier::relax_verify_for(oop loader) {
111 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
112 bool need_verify =
113 // verifyAll
114 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
115 // verifyRemote
116 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
117 return !need_verify;
118 }
120 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
121 HandleMark hm;
122 ResourceMark rm(THREAD);
124 Symbol* exception_name = NULL;
125 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
126 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
127 char* exception_message = message_buffer;
129 const char* klassName = klass->external_name();
130 bool can_failover = FailOverToOldVerifier &&
131 klass->major_version() < NOFAILOVER_MAJOR_VERSION;
133 // If the class should be verified, first see if we can use the split
134 // verifier. If not, or if verification fails and FailOverToOldVerifier
135 // is set, then call the inference verifier.
136 if (is_eligible_for_verification(klass, should_verify_class)) {
137 if (TraceClassInitialization) {
138 tty->print_cr("Start class verification for: %s", klassName);
139 }
140 if (klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
141 ClassVerifier split_verifier(klass, THREAD);
142 split_verifier.verify_class(THREAD);
143 exception_name = split_verifier.result();
144 if (can_failover && !HAS_PENDING_EXCEPTION &&
145 (exception_name == vmSymbols::java_lang_VerifyError() ||
146 exception_name == vmSymbols::java_lang_ClassFormatError())) {
147 if (TraceClassInitialization || VerboseVerification) {
148 tty->print_cr(
149 "Fail over class verification to old verifier for: %s", klassName);
150 }
151 exception_name = inference_verify(
152 klass, message_buffer, message_buffer_len, THREAD);
153 }
154 if (exception_name != NULL) {
155 exception_message = split_verifier.exception_message();
156 }
157 } else {
158 exception_name = inference_verify(
159 klass, message_buffer, message_buffer_len, THREAD);
160 }
162 if (TraceClassInitialization || VerboseVerification) {
163 if (HAS_PENDING_EXCEPTION) {
164 tty->print("Verification for %s has", klassName);
165 tty->print_cr(" exception pending %s ",
166 InstanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
167 } else if (exception_name != NULL) {
168 tty->print_cr("Verification for %s failed", klassName);
169 }
170 tty->print_cr("End class verification for: %s", klassName);
171 }
172 }
174 if (HAS_PENDING_EXCEPTION) {
175 return false; // use the existing exception
176 } else if (exception_name == NULL) {
177 return true; // verifcation succeeded
178 } else { // VerifyError or ClassFormatError to be created and thrown
179 ResourceMark rm(THREAD);
180 instanceKlassHandle kls =
181 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
182 while (!kls.is_null()) {
183 if (kls == klass) {
184 // If the class being verified is the exception we're creating
185 // or one of it's superclasses, we're in trouble and are going
186 // to infinitely recurse when we try to initialize the exception.
187 // So bail out here by throwing the preallocated VM error.
188 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
189 }
190 kls = kls->super();
191 }
192 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
193 THROW_MSG_(exception_name, exception_message, false);
194 }
195 }
197 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
198 Symbol* name = klass->name();
199 Klass* refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
201 bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
203 return (should_verify_for(klass->class_loader(), should_verify_class) &&
204 // return if the class is a bootstrapping class
205 // or defineClass specified not to verify by default (flags override passed arg)
206 // We need to skip the following four for bootstraping
207 name != vmSymbols::java_lang_Object() &&
208 name != vmSymbols::java_lang_Class() &&
209 name != vmSymbols::java_lang_String() &&
210 name != vmSymbols::java_lang_Throwable() &&
212 // Can not verify the bytecodes for shared classes because they have
213 // already been rewritten to contain constant pool cache indices,
214 // which the verifier can't understand.
215 // Shared classes shouldn't have stackmaps either.
216 !klass()->is_shared() &&
218 // As of the fix for 4486457 we disable verification for all of the
219 // dynamically-generated bytecodes associated with the 1.4
220 // reflection implementation, not just those associated with
221 // sun/reflect/SerializationConstructorAccessor.
222 // NOTE: this is called too early in the bootstrapping process to be
223 // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.
224 // Also for lambda generated code, gte jdk8
225 (!is_reflect || VerifyReflectionBytecodes));
226 }
228 Symbol* Verifier::inference_verify(
229 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
230 JavaThread* thread = (JavaThread*)THREAD;
231 JNIEnv *env = thread->jni_environment();
233 void* verify_func = verify_byte_codes_fn();
235 if (verify_func == NULL) {
236 jio_snprintf(message, message_len, "Could not link verifier");
237 return vmSymbols::java_lang_VerifyError();
238 }
240 ResourceMark rm(THREAD);
241 if (VerboseVerification) {
242 tty->print_cr("Verifying class %s with old format", klass->external_name());
243 }
245 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
246 jint result;
248 {
249 HandleMark hm(thread);
250 ThreadToNativeFromVM ttn(thread);
251 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
252 // code knows that we have left the VM
254 if (_is_new_verify_byte_codes_fn) {
255 verify_byte_codes_fn_new_t func =
256 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
257 result = (*func)(env, cls, message, (int)message_len,
258 klass->major_version());
259 } else {
260 verify_byte_codes_fn_t func =
261 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
262 result = (*func)(env, cls, message, (int)message_len);
263 }
264 }
266 JNIHandles::destroy_local(cls);
268 // These numbers are chosen so that VerifyClassCodes interface doesn't need
269 // to be changed (still return jboolean (unsigned char)), and result is
270 // 1 when verification is passed.
271 if (result == 0) {
272 return vmSymbols::java_lang_VerifyError();
273 } else if (result == 1) {
274 return NULL; // verified.
275 } else if (result == 2) {
276 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
277 } else if (result == 3) {
278 return vmSymbols::java_lang_ClassFormatError();
279 } else {
280 ShouldNotReachHere();
281 return NULL;
282 }
283 }
285 TypeOrigin TypeOrigin::null() {
286 return TypeOrigin();
287 }
288 TypeOrigin TypeOrigin::local(u2 index, StackMapFrame* frame) {
289 assert(frame != NULL, "Must have a frame");
290 return TypeOrigin(CF_LOCALS, index, StackMapFrame::copy(frame),
291 frame->local_at(index));
292 }
293 TypeOrigin TypeOrigin::stack(u2 index, StackMapFrame* frame) {
294 assert(frame != NULL, "Must have a frame");
295 return TypeOrigin(CF_STACK, index, StackMapFrame::copy(frame),
296 frame->stack_at(index));
297 }
298 TypeOrigin TypeOrigin::sm_local(u2 index, StackMapFrame* frame) {
299 assert(frame != NULL, "Must have a frame");
300 return TypeOrigin(SM_LOCALS, index, StackMapFrame::copy(frame),
301 frame->local_at(index));
302 }
303 TypeOrigin TypeOrigin::sm_stack(u2 index, StackMapFrame* frame) {
304 assert(frame != NULL, "Must have a frame");
305 return TypeOrigin(SM_STACK, index, StackMapFrame::copy(frame),
306 frame->stack_at(index));
307 }
308 TypeOrigin TypeOrigin::bad_index(u2 index) {
309 return TypeOrigin(BAD_INDEX, index, NULL, VerificationType::bogus_type());
310 }
311 TypeOrigin TypeOrigin::cp(u2 index, VerificationType vt) {
312 return TypeOrigin(CONST_POOL, index, NULL, vt);
313 }
314 TypeOrigin TypeOrigin::signature(VerificationType vt) {
315 return TypeOrigin(SIG, 0, NULL, vt);
316 }
317 TypeOrigin TypeOrigin::implicit(VerificationType t) {
318 return TypeOrigin(IMPLICIT, 0, NULL, t);
319 }
320 TypeOrigin TypeOrigin::frame(StackMapFrame* frame) {
321 return TypeOrigin(FRAME_ONLY, 0, StackMapFrame::copy(frame),
322 VerificationType::bogus_type());
323 }
325 void TypeOrigin::reset_frame() {
326 if (_frame != NULL) {
327 _frame->restore();
328 }
329 }
331 void TypeOrigin::details(outputStream* ss) const {
332 _type.print_on(ss);
333 switch (_origin) {
334 case CF_LOCALS:
335 ss->print(" (current frame, locals[%d])", _index);
336 break;
337 case CF_STACK:
338 ss->print(" (current frame, stack[%d])", _index);
339 break;
340 case SM_LOCALS:
341 ss->print(" (stack map, locals[%d])", _index);
342 break;
343 case SM_STACK:
344 ss->print(" (stack map, stack[%d])", _index);
345 break;
346 case CONST_POOL:
347 ss->print(" (constant pool %d)", _index);
348 break;
349 case SIG:
350 ss->print(" (from method signature)");
351 break;
352 case IMPLICIT:
353 case FRAME_ONLY:
354 case NONE:
355 default:
356 ;
357 }
358 }
360 #ifdef ASSERT
361 void TypeOrigin::print_on(outputStream* str) const {
362 str->print("{%d,%d,%p:", _origin, _index, _frame);
363 if (_frame != NULL) {
364 _frame->print_on(str);
365 } else {
366 str->print("null");
367 }
368 str->print(",");
369 _type.print_on(str);
370 str->print("}");
371 }
372 #endif
374 void ErrorContext::details(outputStream* ss, const Method* method) const {
375 if (is_valid()) {
376 ss->cr();
377 ss->print_cr("Exception Details:");
378 location_details(ss, method);
379 reason_details(ss);
380 frame_details(ss);
381 bytecode_details(ss, method);
382 handler_details(ss, method);
383 stackmap_details(ss, method);
384 }
385 }
387 void ErrorContext::reason_details(outputStream* ss) const {
388 streamIndentor si(ss);
389 ss->indent().print_cr("Reason:");
390 streamIndentor si2(ss);
391 ss->indent().print("%s", "");
392 switch (_fault) {
393 case INVALID_BYTECODE:
394 ss->print("Error exists in the bytecode");
395 break;
396 case WRONG_TYPE:
397 if (_expected.is_valid()) {
398 ss->print("Type ");
399 _type.details(ss);
400 ss->print(" is not assignable to ");
401 _expected.details(ss);
402 } else {
403 ss->print("Invalid type: ");
404 _type.details(ss);
405 }
406 break;
407 case FLAGS_MISMATCH:
408 if (_expected.is_valid()) {
409 ss->print("Current frame's flags are not assignable "
410 "to stack map frame's.");
411 } else {
412 ss->print("Current frame's flags are invalid in this context.");
413 }
414 break;
415 case BAD_CP_INDEX:
416 ss->print("Constant pool index %d is invalid", _type.index());
417 break;
418 case BAD_LOCAL_INDEX:
419 ss->print("Local index %d is invalid", _type.index());
420 break;
421 case LOCALS_SIZE_MISMATCH:
422 ss->print("Current frame's local size doesn't match stackmap.");
423 break;
424 case STACK_SIZE_MISMATCH:
425 ss->print("Current frame's stack size doesn't match stackmap.");
426 break;
427 case STACK_OVERFLOW:
428 ss->print("Exceeded max stack size.");
429 break;
430 case STACK_UNDERFLOW:
431 ss->print("Attempt to pop empty stack.");
432 break;
433 case MISSING_STACKMAP:
434 ss->print("Expected stackmap frame at this location.");
435 break;
436 case BAD_STACKMAP:
437 ss->print("Invalid stackmap specification.");
438 break;
439 case UNKNOWN:
440 default:
441 ShouldNotReachHere();
442 ss->print_cr("Unknown");
443 }
444 ss->cr();
445 }
447 void ErrorContext::location_details(outputStream* ss, const Method* method) const {
448 if (_bci != -1 && method != NULL) {
449 streamIndentor si(ss);
450 const char* bytecode_name = "<invalid>";
451 if (method->validate_bci_from_bcx(_bci) != -1) {
452 Bytecodes::Code code = Bytecodes::code_or_bp_at(method->bcp_from(_bci));
453 if (Bytecodes::is_defined(code)) {
454 bytecode_name = Bytecodes::name(code);
455 } else {
456 bytecode_name = "<illegal>";
457 }
458 }
459 InstanceKlass* ik = method->method_holder();
460 ss->indent().print_cr("Location:");
461 streamIndentor si2(ss);
462 ss->indent().print_cr("%s.%s%s @%d: %s",
463 ik->name()->as_C_string(), method->name()->as_C_string(),
464 method->signature()->as_C_string(), _bci, bytecode_name);
465 }
466 }
468 void ErrorContext::frame_details(outputStream* ss) const {
469 streamIndentor si(ss);
470 if (_type.is_valid() && _type.frame() != NULL) {
471 ss->indent().print_cr("Current Frame:");
472 streamIndentor si2(ss);
473 _type.frame()->print_on(ss);
474 }
475 if (_expected.is_valid() && _expected.frame() != NULL) {
476 ss->indent().print_cr("Stackmap Frame:");
477 streamIndentor si2(ss);
478 _expected.frame()->print_on(ss);
479 }
480 }
482 void ErrorContext::bytecode_details(outputStream* ss, const Method* method) const {
483 if (method != NULL) {
484 streamIndentor si(ss);
485 ss->indent().print_cr("Bytecode:");
486 streamIndentor si2(ss);
487 ss->print_data(method->code_base(), method->code_size(), false);
488 }
489 }
491 void ErrorContext::handler_details(outputStream* ss, const Method* method) const {
492 if (method != NULL) {
493 streamIndentor si(ss);
494 ExceptionTable table(method);
495 if (table.length() > 0) {
496 ss->indent().print_cr("Exception Handler Table:");
497 streamIndentor si2(ss);
498 for (int i = 0; i < table.length(); ++i) {
499 ss->indent().print_cr("bci [%d, %d] => handler: %d", table.start_pc(i),
500 table.end_pc(i), table.handler_pc(i));
501 }
502 }
503 }
504 }
506 void ErrorContext::stackmap_details(outputStream* ss, const Method* method) const {
507 if (method != NULL && method->has_stackmap_table()) {
508 streamIndentor si(ss);
509 ss->indent().print_cr("Stackmap Table:");
510 Array<u1>* data = method->stackmap_data();
511 stack_map_table* sm_table =
512 stack_map_table::at((address)data->adr_at(0));
513 stack_map_frame* sm_frame = sm_table->entries();
514 streamIndentor si2(ss);
515 int current_offset = -1;
516 for (u2 i = 0; i < sm_table->number_of_entries(); ++i) {
517 ss->indent();
518 sm_frame->print_on(ss, current_offset);
519 ss->cr();
520 current_offset += sm_frame->offset_delta();
521 sm_frame = sm_frame->next();
522 }
523 }
524 }
526 // Methods in ClassVerifier
528 ClassVerifier::ClassVerifier(
529 instanceKlassHandle klass, TRAPS)
530 : _thread(THREAD), _exception_type(NULL), _message(NULL), _klass(klass) {
531 _this_type = VerificationType::reference_type(klass->name());
532 // Create list to hold symbols in reference area.
533 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
534 }
536 ClassVerifier::~ClassVerifier() {
537 // Decrement the reference count for any symbols created.
538 for (int i = 0; i < _symbols->length(); i++) {
539 Symbol* s = _symbols->at(i);
540 s->decrement_refcount();
541 }
542 }
544 VerificationType ClassVerifier::object_type() const {
545 return VerificationType::reference_type(vmSymbols::java_lang_Object());
546 }
548 TypeOrigin ClassVerifier::ref_ctx(const char* sig, TRAPS) {
549 VerificationType vt = VerificationType::reference_type(
550 create_temporary_symbol(sig, (int)strlen(sig), THREAD));
551 return TypeOrigin::implicit(vt);
552 }
554 void ClassVerifier::verify_class(TRAPS) {
555 if (VerboseVerification) {
556 tty->print_cr("Verifying class %s with new format",
557 _klass->external_name());
558 }
560 Array<Method*>* methods = _klass->methods();
561 int num_methods = methods->length();
563 for (int index = 0; index < num_methods; index++) {
564 // Check for recursive re-verification before each method.
565 if (was_recursively_verified()) return;
567 Method* m = methods->at(index);
568 if (m->is_native() || m->is_abstract() || m->is_overpass()) {
569 // If m is native or abstract, skip it. It is checked in class file
570 // parser that methods do not override a final method. Overpass methods
571 // are trusted since the VM generates them.
572 continue;
573 }
574 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
575 }
577 if (VerboseVerification || TraceClassInitialization) {
578 if (was_recursively_verified())
579 tty->print_cr("Recursive verification detected for: %s",
580 _klass->external_name());
581 }
582 }
584 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
585 HandleMark hm(THREAD);
586 _method = m; // initialize _method
587 if (VerboseVerification) {
588 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
589 }
591 // For clang, the only good constant format string is a literal constant format string.
592 #define bad_type_msg "Bad type on operand stack in %s"
594 int32_t max_stack = m->verifier_max_stack();
595 int32_t max_locals = m->max_locals();
596 constantPoolHandle cp(THREAD, m->constants());
598 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
599 class_format_error("Invalid method signature");
600 return;
601 }
603 // Initial stack map frame: offset is 0, stack is initially empty.
604 StackMapFrame current_frame(max_locals, max_stack, this);
605 // Set initial locals
606 VerificationType return_type = current_frame.set_locals_from_arg(
607 m, current_type(), CHECK_VERIFY(this));
609 int32_t stackmap_index = 0; // index to the stackmap array
611 u4 code_length = m->code_size();
613 // Scan the bytecode and map each instruction's start offset to a number.
614 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
616 int ex_min = code_length;
617 int ex_max = -1;
618 // Look through each item on the exception table. Each of the fields must refer
619 // to a legal instruction.
620 verify_exception_handler_table(
621 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
623 // Look through each entry on the local variable table and make sure
624 // its range of code array offsets is valid. (4169817)
625 if (m->has_localvariable_table()) {
626 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
627 }
629 Array<u1>* stackmap_data = m->stackmap_data();
630 StackMapStream stream(stackmap_data);
631 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
632 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
633 code_data, code_length, CHECK_VERIFY(this));
635 if (VerboseVerification) {
636 stackmap_table.print_on(tty);
637 }
639 RawBytecodeStream bcs(m);
641 // Scan the byte code linearly from the start to the end
642 bool no_control_flow = false; // Set to true when there is no direct control
643 // flow from current instruction to the next
644 // instruction in sequence
646 Bytecodes::Code opcode;
647 while (!bcs.is_last_bytecode()) {
648 // Check for recursive re-verification before each bytecode.
649 if (was_recursively_verified()) return;
651 opcode = bcs.raw_next();
652 u2 bci = bcs.bci();
654 // Set current frame's offset to bci
655 current_frame.set_offset(bci);
656 current_frame.set_mark();
658 // Make sure every offset in stackmap table point to the beginning to
659 // an instruction. Match current_frame to stackmap_table entry with
660 // the same offset if exists.
661 stackmap_index = verify_stackmap_table(
662 stackmap_index, bci, ¤t_frame, &stackmap_table,
663 no_control_flow, CHECK_VERIFY(this));
666 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
668 // Merge with the next instruction
669 {
670 u2 index;
671 int target;
672 VerificationType type, type2;
673 VerificationType atype;
675 #ifndef PRODUCT
676 if (VerboseVerification) {
677 current_frame.print_on(tty);
678 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
679 }
680 #endif
682 // Make sure wide instruction is in correct format
683 if (bcs.is_wide()) {
684 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
685 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
686 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
687 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
688 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
689 opcode != Bytecodes::_dstore) {
690 /* Unreachable? RawBytecodeStream's raw_next() returns 'illegal'
691 * if we encounter a wide instruction that modifies an invalid
692 * opcode (not one of the ones listed above) */
693 verify_error(ErrorContext::bad_code(bci), "Bad wide instruction");
694 return;
695 }
696 }
698 switch (opcode) {
699 case Bytecodes::_nop :
700 no_control_flow = false; break;
701 case Bytecodes::_aconst_null :
702 current_frame.push_stack(
703 VerificationType::null_type(), CHECK_VERIFY(this));
704 no_control_flow = false; break;
705 case Bytecodes::_iconst_m1 :
706 case Bytecodes::_iconst_0 :
707 case Bytecodes::_iconst_1 :
708 case Bytecodes::_iconst_2 :
709 case Bytecodes::_iconst_3 :
710 case Bytecodes::_iconst_4 :
711 case Bytecodes::_iconst_5 :
712 current_frame.push_stack(
713 VerificationType::integer_type(), CHECK_VERIFY(this));
714 no_control_flow = false; break;
715 case Bytecodes::_lconst_0 :
716 case Bytecodes::_lconst_1 :
717 current_frame.push_stack_2(
718 VerificationType::long_type(),
719 VerificationType::long2_type(), CHECK_VERIFY(this));
720 no_control_flow = false; break;
721 case Bytecodes::_fconst_0 :
722 case Bytecodes::_fconst_1 :
723 case Bytecodes::_fconst_2 :
724 current_frame.push_stack(
725 VerificationType::float_type(), CHECK_VERIFY(this));
726 no_control_flow = false; break;
727 case Bytecodes::_dconst_0 :
728 case Bytecodes::_dconst_1 :
729 current_frame.push_stack_2(
730 VerificationType::double_type(),
731 VerificationType::double2_type(), CHECK_VERIFY(this));
732 no_control_flow = false; break;
733 case Bytecodes::_sipush :
734 case Bytecodes::_bipush :
735 current_frame.push_stack(
736 VerificationType::integer_type(), CHECK_VERIFY(this));
737 no_control_flow = false; break;
738 case Bytecodes::_ldc :
739 verify_ldc(
740 opcode, bcs.get_index_u1(), ¤t_frame,
741 cp, bci, CHECK_VERIFY(this));
742 no_control_flow = false; break;
743 case Bytecodes::_ldc_w :
744 case Bytecodes::_ldc2_w :
745 verify_ldc(
746 opcode, bcs.get_index_u2(), ¤t_frame,
747 cp, bci, CHECK_VERIFY(this));
748 no_control_flow = false; break;
749 case Bytecodes::_iload :
750 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
751 no_control_flow = false; break;
752 case Bytecodes::_iload_0 :
753 case Bytecodes::_iload_1 :
754 case Bytecodes::_iload_2 :
755 case Bytecodes::_iload_3 :
756 index = opcode - Bytecodes::_iload_0;
757 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
758 no_control_flow = false; break;
759 case Bytecodes::_lload :
760 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
761 no_control_flow = false; break;
762 case Bytecodes::_lload_0 :
763 case Bytecodes::_lload_1 :
764 case Bytecodes::_lload_2 :
765 case Bytecodes::_lload_3 :
766 index = opcode - Bytecodes::_lload_0;
767 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
768 no_control_flow = false; break;
769 case Bytecodes::_fload :
770 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
771 no_control_flow = false; break;
772 case Bytecodes::_fload_0 :
773 case Bytecodes::_fload_1 :
774 case Bytecodes::_fload_2 :
775 case Bytecodes::_fload_3 :
776 index = opcode - Bytecodes::_fload_0;
777 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
778 no_control_flow = false; break;
779 case Bytecodes::_dload :
780 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
781 no_control_flow = false; break;
782 case Bytecodes::_dload_0 :
783 case Bytecodes::_dload_1 :
784 case Bytecodes::_dload_2 :
785 case Bytecodes::_dload_3 :
786 index = opcode - Bytecodes::_dload_0;
787 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
788 no_control_flow = false; break;
789 case Bytecodes::_aload :
790 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
791 no_control_flow = false; break;
792 case Bytecodes::_aload_0 :
793 case Bytecodes::_aload_1 :
794 case Bytecodes::_aload_2 :
795 case Bytecodes::_aload_3 :
796 index = opcode - Bytecodes::_aload_0;
797 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
798 no_control_flow = false; break;
799 case Bytecodes::_iaload :
800 type = current_frame.pop_stack(
801 VerificationType::integer_type(), CHECK_VERIFY(this));
802 atype = current_frame.pop_stack(
803 VerificationType::reference_check(), CHECK_VERIFY(this));
804 if (!atype.is_int_array()) {
805 verify_error(ErrorContext::bad_type(bci,
806 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
807 bad_type_msg, "iaload");
808 return;
809 }
810 current_frame.push_stack(
811 VerificationType::integer_type(), CHECK_VERIFY(this));
812 no_control_flow = false; break;
813 case Bytecodes::_baload :
814 type = current_frame.pop_stack(
815 VerificationType::integer_type(), CHECK_VERIFY(this));
816 atype = current_frame.pop_stack(
817 VerificationType::reference_check(), CHECK_VERIFY(this));
818 if (!atype.is_bool_array() && !atype.is_byte_array()) {
819 verify_error(
820 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
821 bad_type_msg, "baload");
822 return;
823 }
824 current_frame.push_stack(
825 VerificationType::integer_type(), CHECK_VERIFY(this));
826 no_control_flow = false; break;
827 case Bytecodes::_caload :
828 type = current_frame.pop_stack(
829 VerificationType::integer_type(), CHECK_VERIFY(this));
830 atype = current_frame.pop_stack(
831 VerificationType::reference_check(), CHECK_VERIFY(this));
832 if (!atype.is_char_array()) {
833 verify_error(ErrorContext::bad_type(bci,
834 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
835 bad_type_msg, "caload");
836 return;
837 }
838 current_frame.push_stack(
839 VerificationType::integer_type(), CHECK_VERIFY(this));
840 no_control_flow = false; break;
841 case Bytecodes::_saload :
842 type = current_frame.pop_stack(
843 VerificationType::integer_type(), CHECK_VERIFY(this));
844 atype = current_frame.pop_stack(
845 VerificationType::reference_check(), CHECK_VERIFY(this));
846 if (!atype.is_short_array()) {
847 verify_error(ErrorContext::bad_type(bci,
848 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
849 bad_type_msg, "saload");
850 return;
851 }
852 current_frame.push_stack(
853 VerificationType::integer_type(), CHECK_VERIFY(this));
854 no_control_flow = false; break;
855 case Bytecodes::_laload :
856 type = current_frame.pop_stack(
857 VerificationType::integer_type(), CHECK_VERIFY(this));
858 atype = current_frame.pop_stack(
859 VerificationType::reference_check(), CHECK_VERIFY(this));
860 if (!atype.is_long_array()) {
861 verify_error(ErrorContext::bad_type(bci,
862 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
863 bad_type_msg, "laload");
864 return;
865 }
866 current_frame.push_stack_2(
867 VerificationType::long_type(),
868 VerificationType::long2_type(), CHECK_VERIFY(this));
869 no_control_flow = false; break;
870 case Bytecodes::_faload :
871 type = current_frame.pop_stack(
872 VerificationType::integer_type(), CHECK_VERIFY(this));
873 atype = current_frame.pop_stack(
874 VerificationType::reference_check(), CHECK_VERIFY(this));
875 if (!atype.is_float_array()) {
876 verify_error(ErrorContext::bad_type(bci,
877 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
878 bad_type_msg, "faload");
879 return;
880 }
881 current_frame.push_stack(
882 VerificationType::float_type(), CHECK_VERIFY(this));
883 no_control_flow = false; break;
884 case Bytecodes::_daload :
885 type = current_frame.pop_stack(
886 VerificationType::integer_type(), CHECK_VERIFY(this));
887 atype = current_frame.pop_stack(
888 VerificationType::reference_check(), CHECK_VERIFY(this));
889 if (!atype.is_double_array()) {
890 verify_error(ErrorContext::bad_type(bci,
891 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
892 bad_type_msg, "daload");
893 return;
894 }
895 current_frame.push_stack_2(
896 VerificationType::double_type(),
897 VerificationType::double2_type(), CHECK_VERIFY(this));
898 no_control_flow = false; break;
899 case Bytecodes::_aaload : {
900 type = current_frame.pop_stack(
901 VerificationType::integer_type(), CHECK_VERIFY(this));
902 atype = current_frame.pop_stack(
903 VerificationType::reference_check(), CHECK_VERIFY(this));
904 if (!atype.is_reference_array()) {
905 verify_error(ErrorContext::bad_type(bci,
906 current_frame.stack_top_ctx(),
907 TypeOrigin::implicit(VerificationType::reference_check())),
908 bad_type_msg, "aaload");
909 return;
910 }
911 if (atype.is_null()) {
912 current_frame.push_stack(
913 VerificationType::null_type(), CHECK_VERIFY(this));
914 } else {
915 VerificationType component =
916 atype.get_component(this, CHECK_VERIFY(this));
917 current_frame.push_stack(component, CHECK_VERIFY(this));
918 }
919 no_control_flow = false; break;
920 }
921 case Bytecodes::_istore :
922 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
923 no_control_flow = false; break;
924 case Bytecodes::_istore_0 :
925 case Bytecodes::_istore_1 :
926 case Bytecodes::_istore_2 :
927 case Bytecodes::_istore_3 :
928 index = opcode - Bytecodes::_istore_0;
929 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
930 no_control_flow = false; break;
931 case Bytecodes::_lstore :
932 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
933 no_control_flow = false; break;
934 case Bytecodes::_lstore_0 :
935 case Bytecodes::_lstore_1 :
936 case Bytecodes::_lstore_2 :
937 case Bytecodes::_lstore_3 :
938 index = opcode - Bytecodes::_lstore_0;
939 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
940 no_control_flow = false; break;
941 case Bytecodes::_fstore :
942 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
943 no_control_flow = false; break;
944 case Bytecodes::_fstore_0 :
945 case Bytecodes::_fstore_1 :
946 case Bytecodes::_fstore_2 :
947 case Bytecodes::_fstore_3 :
948 index = opcode - Bytecodes::_fstore_0;
949 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
950 no_control_flow = false; break;
951 case Bytecodes::_dstore :
952 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
953 no_control_flow = false; break;
954 case Bytecodes::_dstore_0 :
955 case Bytecodes::_dstore_1 :
956 case Bytecodes::_dstore_2 :
957 case Bytecodes::_dstore_3 :
958 index = opcode - Bytecodes::_dstore_0;
959 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
960 no_control_flow = false; break;
961 case Bytecodes::_astore :
962 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
963 no_control_flow = false; break;
964 case Bytecodes::_astore_0 :
965 case Bytecodes::_astore_1 :
966 case Bytecodes::_astore_2 :
967 case Bytecodes::_astore_3 :
968 index = opcode - Bytecodes::_astore_0;
969 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
970 no_control_flow = false; break;
971 case Bytecodes::_iastore :
972 type = current_frame.pop_stack(
973 VerificationType::integer_type(), CHECK_VERIFY(this));
974 type2 = current_frame.pop_stack(
975 VerificationType::integer_type(), CHECK_VERIFY(this));
976 atype = current_frame.pop_stack(
977 VerificationType::reference_check(), CHECK_VERIFY(this));
978 if (!atype.is_int_array()) {
979 verify_error(ErrorContext::bad_type(bci,
980 current_frame.stack_top_ctx(), ref_ctx("[I", THREAD)),
981 bad_type_msg, "iastore");
982 return;
983 }
984 no_control_flow = false; break;
985 case Bytecodes::_bastore :
986 type = current_frame.pop_stack(
987 VerificationType::integer_type(), CHECK_VERIFY(this));
988 type2 = current_frame.pop_stack(
989 VerificationType::integer_type(), CHECK_VERIFY(this));
990 atype = current_frame.pop_stack(
991 VerificationType::reference_check(), CHECK_VERIFY(this));
992 if (!atype.is_bool_array() && !atype.is_byte_array()) {
993 verify_error(
994 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
995 bad_type_msg, "bastore");
996 return;
997 }
998 no_control_flow = false; break;
999 case Bytecodes::_castore :
1000 current_frame.pop_stack(
1001 VerificationType::integer_type(), CHECK_VERIFY(this));
1002 current_frame.pop_stack(
1003 VerificationType::integer_type(), CHECK_VERIFY(this));
1004 atype = current_frame.pop_stack(
1005 VerificationType::reference_check(), CHECK_VERIFY(this));
1006 if (!atype.is_char_array()) {
1007 verify_error(ErrorContext::bad_type(bci,
1008 current_frame.stack_top_ctx(), ref_ctx("[C", THREAD)),
1009 bad_type_msg, "castore");
1010 return;
1011 }
1012 no_control_flow = false; break;
1013 case Bytecodes::_sastore :
1014 current_frame.pop_stack(
1015 VerificationType::integer_type(), CHECK_VERIFY(this));
1016 current_frame.pop_stack(
1017 VerificationType::integer_type(), CHECK_VERIFY(this));
1018 atype = current_frame.pop_stack(
1019 VerificationType::reference_check(), CHECK_VERIFY(this));
1020 if (!atype.is_short_array()) {
1021 verify_error(ErrorContext::bad_type(bci,
1022 current_frame.stack_top_ctx(), ref_ctx("[S", THREAD)),
1023 bad_type_msg, "sastore");
1024 return;
1025 }
1026 no_control_flow = false; break;
1027 case Bytecodes::_lastore :
1028 current_frame.pop_stack_2(
1029 VerificationType::long2_type(),
1030 VerificationType::long_type(), CHECK_VERIFY(this));
1031 current_frame.pop_stack(
1032 VerificationType::integer_type(), CHECK_VERIFY(this));
1033 atype = current_frame.pop_stack(
1034 VerificationType::reference_check(), CHECK_VERIFY(this));
1035 if (!atype.is_long_array()) {
1036 verify_error(ErrorContext::bad_type(bci,
1037 current_frame.stack_top_ctx(), ref_ctx("[J", THREAD)),
1038 bad_type_msg, "lastore");
1039 return;
1040 }
1041 no_control_flow = false; break;
1042 case Bytecodes::_fastore :
1043 current_frame.pop_stack(
1044 VerificationType::float_type(), CHECK_VERIFY(this));
1045 current_frame.pop_stack
1046 (VerificationType::integer_type(), CHECK_VERIFY(this));
1047 atype = current_frame.pop_stack(
1048 VerificationType::reference_check(), CHECK_VERIFY(this));
1049 if (!atype.is_float_array()) {
1050 verify_error(ErrorContext::bad_type(bci,
1051 current_frame.stack_top_ctx(), ref_ctx("[F", THREAD)),
1052 bad_type_msg, "fastore");
1053 return;
1054 }
1055 no_control_flow = false; break;
1056 case Bytecodes::_dastore :
1057 current_frame.pop_stack_2(
1058 VerificationType::double2_type(),
1059 VerificationType::double_type(), CHECK_VERIFY(this));
1060 current_frame.pop_stack(
1061 VerificationType::integer_type(), CHECK_VERIFY(this));
1062 atype = current_frame.pop_stack(
1063 VerificationType::reference_check(), CHECK_VERIFY(this));
1064 if (!atype.is_double_array()) {
1065 verify_error(ErrorContext::bad_type(bci,
1066 current_frame.stack_top_ctx(), ref_ctx("[D", THREAD)),
1067 bad_type_msg, "dastore");
1068 return;
1069 }
1070 no_control_flow = false; break;
1071 case Bytecodes::_aastore :
1072 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1073 type2 = current_frame.pop_stack(
1074 VerificationType::integer_type(), CHECK_VERIFY(this));
1075 atype = current_frame.pop_stack(
1076 VerificationType::reference_check(), CHECK_VERIFY(this));
1077 // more type-checking is done at runtime
1078 if (!atype.is_reference_array()) {
1079 verify_error(ErrorContext::bad_type(bci,
1080 current_frame.stack_top_ctx(),
1081 TypeOrigin::implicit(VerificationType::reference_check())),
1082 bad_type_msg, "aastore");
1083 return;
1084 }
1085 // 4938384: relaxed constraint in JVMS 3nd edition.
1086 no_control_flow = false; break;
1087 case Bytecodes::_pop :
1088 current_frame.pop_stack(
1089 VerificationType::category1_check(), CHECK_VERIFY(this));
1090 no_control_flow = false; break;
1091 case Bytecodes::_pop2 :
1092 type = current_frame.pop_stack(CHECK_VERIFY(this));
1093 if (type.is_category1()) {
1094 current_frame.pop_stack(
1095 VerificationType::category1_check(), CHECK_VERIFY(this));
1096 } else if (type.is_category2_2nd()) {
1097 current_frame.pop_stack(
1098 VerificationType::category2_check(), CHECK_VERIFY(this));
1099 } else {
1100 /* Unreachable? Would need a category2_1st on TOS
1101 * which does not appear possible. */
1102 verify_error(
1103 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1104 bad_type_msg, "pop2");
1105 return;
1106 }
1107 no_control_flow = false; break;
1108 case Bytecodes::_dup :
1109 type = current_frame.pop_stack(
1110 VerificationType::category1_check(), CHECK_VERIFY(this));
1111 current_frame.push_stack(type, CHECK_VERIFY(this));
1112 current_frame.push_stack(type, CHECK_VERIFY(this));
1113 no_control_flow = false; break;
1114 case Bytecodes::_dup_x1 :
1115 type = current_frame.pop_stack(
1116 VerificationType::category1_check(), CHECK_VERIFY(this));
1117 type2 = current_frame.pop_stack(
1118 VerificationType::category1_check(), CHECK_VERIFY(this));
1119 current_frame.push_stack(type, CHECK_VERIFY(this));
1120 current_frame.push_stack(type2, CHECK_VERIFY(this));
1121 current_frame.push_stack(type, CHECK_VERIFY(this));
1122 no_control_flow = false; break;
1123 case Bytecodes::_dup_x2 :
1124 {
1125 VerificationType type3;
1126 type = current_frame.pop_stack(
1127 VerificationType::category1_check(), CHECK_VERIFY(this));
1128 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
1129 if (type2.is_category1()) {
1130 type3 = current_frame.pop_stack(
1131 VerificationType::category1_check(), CHECK_VERIFY(this));
1132 } else if (type2.is_category2_2nd()) {
1133 type3 = current_frame.pop_stack(
1134 VerificationType::category2_check(), CHECK_VERIFY(this));
1135 } else {
1136 /* Unreachable? Would need a category2_1st at stack depth 2 with
1137 * a category1 on TOS which does not appear possible. */
1138 verify_error(ErrorContext::bad_type(
1139 bci, current_frame.stack_top_ctx()), bad_type_msg, "dup_x2");
1140 return;
1141 }
1142 current_frame.push_stack(type, CHECK_VERIFY(this));
1143 current_frame.push_stack(type3, CHECK_VERIFY(this));
1144 current_frame.push_stack(type2, CHECK_VERIFY(this));
1145 current_frame.push_stack(type, CHECK_VERIFY(this));
1146 no_control_flow = false; break;
1147 }
1148 case Bytecodes::_dup2 :
1149 type = current_frame.pop_stack(CHECK_VERIFY(this));
1150 if (type.is_category1()) {
1151 type2 = current_frame.pop_stack(
1152 VerificationType::category1_check(), CHECK_VERIFY(this));
1153 } else if (type.is_category2_2nd()) {
1154 type2 = current_frame.pop_stack(
1155 VerificationType::category2_check(), CHECK_VERIFY(this));
1156 } else {
1157 /* Unreachable? Would need a category2_1st on TOS which does not
1158 * appear possible. */
1159 verify_error(
1160 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1161 bad_type_msg, "dup2");
1162 return;
1163 }
1164 current_frame.push_stack(type2, CHECK_VERIFY(this));
1165 current_frame.push_stack(type, CHECK_VERIFY(this));
1166 current_frame.push_stack(type2, CHECK_VERIFY(this));
1167 current_frame.push_stack(type, CHECK_VERIFY(this));
1168 no_control_flow = false; break;
1169 case Bytecodes::_dup2_x1 :
1170 {
1171 VerificationType type3;
1172 type = current_frame.pop_stack(CHECK_VERIFY(this));
1173 if (type.is_category1()) {
1174 type2 = current_frame.pop_stack(
1175 VerificationType::category1_check(), CHECK_VERIFY(this));
1176 } else if (type.is_category2_2nd()) {
1177 type2 = current_frame.pop_stack(
1178 VerificationType::category2_check(), CHECK_VERIFY(this));
1179 } else {
1180 /* Unreachable? Would need a category2_1st on TOS which does
1181 * not appear possible. */
1182 verify_error(
1183 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1184 bad_type_msg, "dup2_x1");
1185 return;
1186 }
1187 type3 = current_frame.pop_stack(
1188 VerificationType::category1_check(), CHECK_VERIFY(this));
1189 current_frame.push_stack(type2, CHECK_VERIFY(this));
1190 current_frame.push_stack(type, CHECK_VERIFY(this));
1191 current_frame.push_stack(type3, CHECK_VERIFY(this));
1192 current_frame.push_stack(type2, CHECK_VERIFY(this));
1193 current_frame.push_stack(type, CHECK_VERIFY(this));
1194 no_control_flow = false; break;
1195 }
1196 case Bytecodes::_dup2_x2 :
1197 {
1198 VerificationType type3, type4;
1199 type = current_frame.pop_stack(CHECK_VERIFY(this));
1200 if (type.is_category1()) {
1201 type2 = current_frame.pop_stack(
1202 VerificationType::category1_check(), CHECK_VERIFY(this));
1203 } else if (type.is_category2_2nd()) {
1204 type2 = current_frame.pop_stack(
1205 VerificationType::category2_check(), CHECK_VERIFY(this));
1206 } else {
1207 /* Unreachable? Would need a category2_1st on TOS which does
1208 * not appear possible. */
1209 verify_error(
1210 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1211 bad_type_msg, "dup2_x2");
1212 return;
1213 }
1214 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
1215 if (type3.is_category1()) {
1216 type4 = current_frame.pop_stack(
1217 VerificationType::category1_check(), CHECK_VERIFY(this));
1218 } else if (type3.is_category2_2nd()) {
1219 type4 = current_frame.pop_stack(
1220 VerificationType::category2_check(), CHECK_VERIFY(this));
1221 } else {
1222 /* Unreachable? Would need a category2_1st on TOS after popping
1223 * a long/double or two category 1's, which does not
1224 * appear possible. */
1225 verify_error(
1226 ErrorContext::bad_type(bci, current_frame.stack_top_ctx()),
1227 bad_type_msg, "dup2_x2");
1228 return;
1229 }
1230 current_frame.push_stack(type2, CHECK_VERIFY(this));
1231 current_frame.push_stack(type, CHECK_VERIFY(this));
1232 current_frame.push_stack(type4, CHECK_VERIFY(this));
1233 current_frame.push_stack(type3, CHECK_VERIFY(this));
1234 current_frame.push_stack(type2, CHECK_VERIFY(this));
1235 current_frame.push_stack(type, CHECK_VERIFY(this));
1236 no_control_flow = false; break;
1237 }
1238 case Bytecodes::_swap :
1239 type = current_frame.pop_stack(
1240 VerificationType::category1_check(), CHECK_VERIFY(this));
1241 type2 = current_frame.pop_stack(
1242 VerificationType::category1_check(), CHECK_VERIFY(this));
1243 current_frame.push_stack(type, CHECK_VERIFY(this));
1244 current_frame.push_stack(type2, CHECK_VERIFY(this));
1245 no_control_flow = false; break;
1246 case Bytecodes::_iadd :
1247 case Bytecodes::_isub :
1248 case Bytecodes::_imul :
1249 case Bytecodes::_idiv :
1250 case Bytecodes::_irem :
1251 case Bytecodes::_ishl :
1252 case Bytecodes::_ishr :
1253 case Bytecodes::_iushr :
1254 case Bytecodes::_ior :
1255 case Bytecodes::_ixor :
1256 case Bytecodes::_iand :
1257 current_frame.pop_stack(
1258 VerificationType::integer_type(), CHECK_VERIFY(this));
1259 // fall through
1260 case Bytecodes::_ineg :
1261 current_frame.pop_stack(
1262 VerificationType::integer_type(), CHECK_VERIFY(this));
1263 current_frame.push_stack(
1264 VerificationType::integer_type(), CHECK_VERIFY(this));
1265 no_control_flow = false; break;
1266 case Bytecodes::_ladd :
1267 case Bytecodes::_lsub :
1268 case Bytecodes::_lmul :
1269 case Bytecodes::_ldiv :
1270 case Bytecodes::_lrem :
1271 case Bytecodes::_land :
1272 case Bytecodes::_lor :
1273 case Bytecodes::_lxor :
1274 current_frame.pop_stack_2(
1275 VerificationType::long2_type(),
1276 VerificationType::long_type(), CHECK_VERIFY(this));
1277 // fall through
1278 case Bytecodes::_lneg :
1279 current_frame.pop_stack_2(
1280 VerificationType::long2_type(),
1281 VerificationType::long_type(), CHECK_VERIFY(this));
1282 current_frame.push_stack_2(
1283 VerificationType::long_type(),
1284 VerificationType::long2_type(), CHECK_VERIFY(this));
1285 no_control_flow = false; break;
1286 case Bytecodes::_lshl :
1287 case Bytecodes::_lshr :
1288 case Bytecodes::_lushr :
1289 current_frame.pop_stack(
1290 VerificationType::integer_type(), CHECK_VERIFY(this));
1291 current_frame.pop_stack_2(
1292 VerificationType::long2_type(),
1293 VerificationType::long_type(), CHECK_VERIFY(this));
1294 current_frame.push_stack_2(
1295 VerificationType::long_type(),
1296 VerificationType::long2_type(), CHECK_VERIFY(this));
1297 no_control_flow = false; break;
1298 case Bytecodes::_fadd :
1299 case Bytecodes::_fsub :
1300 case Bytecodes::_fmul :
1301 case Bytecodes::_fdiv :
1302 case Bytecodes::_frem :
1303 current_frame.pop_stack(
1304 VerificationType::float_type(), CHECK_VERIFY(this));
1305 // fall through
1306 case Bytecodes::_fneg :
1307 current_frame.pop_stack(
1308 VerificationType::float_type(), CHECK_VERIFY(this));
1309 current_frame.push_stack(
1310 VerificationType::float_type(), CHECK_VERIFY(this));
1311 no_control_flow = false; break;
1312 case Bytecodes::_dadd :
1313 case Bytecodes::_dsub :
1314 case Bytecodes::_dmul :
1315 case Bytecodes::_ddiv :
1316 case Bytecodes::_drem :
1317 current_frame.pop_stack_2(
1318 VerificationType::double2_type(),
1319 VerificationType::double_type(), CHECK_VERIFY(this));
1320 // fall through
1321 case Bytecodes::_dneg :
1322 current_frame.pop_stack_2(
1323 VerificationType::double2_type(),
1324 VerificationType::double_type(), CHECK_VERIFY(this));
1325 current_frame.push_stack_2(
1326 VerificationType::double_type(),
1327 VerificationType::double2_type(), CHECK_VERIFY(this));
1328 no_control_flow = false; break;
1329 case Bytecodes::_iinc :
1330 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
1331 no_control_flow = false; break;
1332 case Bytecodes::_i2l :
1333 type = current_frame.pop_stack(
1334 VerificationType::integer_type(), CHECK_VERIFY(this));
1335 current_frame.push_stack_2(
1336 VerificationType::long_type(),
1337 VerificationType::long2_type(), CHECK_VERIFY(this));
1338 no_control_flow = false; break;
1339 case Bytecodes::_l2i :
1340 current_frame.pop_stack_2(
1341 VerificationType::long2_type(),
1342 VerificationType::long_type(), CHECK_VERIFY(this));
1343 current_frame.push_stack(
1344 VerificationType::integer_type(), CHECK_VERIFY(this));
1345 no_control_flow = false; break;
1346 case Bytecodes::_i2f :
1347 current_frame.pop_stack(
1348 VerificationType::integer_type(), CHECK_VERIFY(this));
1349 current_frame.push_stack(
1350 VerificationType::float_type(), CHECK_VERIFY(this));
1351 no_control_flow = false; break;
1352 case Bytecodes::_i2d :
1353 current_frame.pop_stack(
1354 VerificationType::integer_type(), CHECK_VERIFY(this));
1355 current_frame.push_stack_2(
1356 VerificationType::double_type(),
1357 VerificationType::double2_type(), CHECK_VERIFY(this));
1358 no_control_flow = false; break;
1359 case Bytecodes::_l2f :
1360 current_frame.pop_stack_2(
1361 VerificationType::long2_type(),
1362 VerificationType::long_type(), CHECK_VERIFY(this));
1363 current_frame.push_stack(
1364 VerificationType::float_type(), CHECK_VERIFY(this));
1365 no_control_flow = false; break;
1366 case Bytecodes::_l2d :
1367 current_frame.pop_stack_2(
1368 VerificationType::long2_type(),
1369 VerificationType::long_type(), CHECK_VERIFY(this));
1370 current_frame.push_stack_2(
1371 VerificationType::double_type(),
1372 VerificationType::double2_type(), CHECK_VERIFY(this));
1373 no_control_flow = false; break;
1374 case Bytecodes::_f2i :
1375 current_frame.pop_stack(
1376 VerificationType::float_type(), CHECK_VERIFY(this));
1377 current_frame.push_stack(
1378 VerificationType::integer_type(), CHECK_VERIFY(this));
1379 no_control_flow = false; break;
1380 case Bytecodes::_f2l :
1381 current_frame.pop_stack(
1382 VerificationType::float_type(), CHECK_VERIFY(this));
1383 current_frame.push_stack_2(
1384 VerificationType::long_type(),
1385 VerificationType::long2_type(), CHECK_VERIFY(this));
1386 no_control_flow = false; break;
1387 case Bytecodes::_f2d :
1388 current_frame.pop_stack(
1389 VerificationType::float_type(), CHECK_VERIFY(this));
1390 current_frame.push_stack_2(
1391 VerificationType::double_type(),
1392 VerificationType::double2_type(), CHECK_VERIFY(this));
1393 no_control_flow = false; break;
1394 case Bytecodes::_d2i :
1395 current_frame.pop_stack_2(
1396 VerificationType::double2_type(),
1397 VerificationType::double_type(), CHECK_VERIFY(this));
1398 current_frame.push_stack(
1399 VerificationType::integer_type(), CHECK_VERIFY(this));
1400 no_control_flow = false; break;
1401 case Bytecodes::_d2l :
1402 current_frame.pop_stack_2(
1403 VerificationType::double2_type(),
1404 VerificationType::double_type(), CHECK_VERIFY(this));
1405 current_frame.push_stack_2(
1406 VerificationType::long_type(),
1407 VerificationType::long2_type(), CHECK_VERIFY(this));
1408 no_control_flow = false; break;
1409 case Bytecodes::_d2f :
1410 current_frame.pop_stack_2(
1411 VerificationType::double2_type(),
1412 VerificationType::double_type(), CHECK_VERIFY(this));
1413 current_frame.push_stack(
1414 VerificationType::float_type(), CHECK_VERIFY(this));
1415 no_control_flow = false; break;
1416 case Bytecodes::_i2b :
1417 case Bytecodes::_i2c :
1418 case Bytecodes::_i2s :
1419 current_frame.pop_stack(
1420 VerificationType::integer_type(), CHECK_VERIFY(this));
1421 current_frame.push_stack(
1422 VerificationType::integer_type(), CHECK_VERIFY(this));
1423 no_control_flow = false; break;
1424 case Bytecodes::_lcmp :
1425 current_frame.pop_stack_2(
1426 VerificationType::long2_type(),
1427 VerificationType::long_type(), CHECK_VERIFY(this));
1428 current_frame.pop_stack_2(
1429 VerificationType::long2_type(),
1430 VerificationType::long_type(), CHECK_VERIFY(this));
1431 current_frame.push_stack(
1432 VerificationType::integer_type(), CHECK_VERIFY(this));
1433 no_control_flow = false; break;
1434 case Bytecodes::_fcmpl :
1435 case Bytecodes::_fcmpg :
1436 current_frame.pop_stack(
1437 VerificationType::float_type(), CHECK_VERIFY(this));
1438 current_frame.pop_stack(
1439 VerificationType::float_type(), CHECK_VERIFY(this));
1440 current_frame.push_stack(
1441 VerificationType::integer_type(), CHECK_VERIFY(this));
1442 no_control_flow = false; break;
1443 case Bytecodes::_dcmpl :
1444 case Bytecodes::_dcmpg :
1445 current_frame.pop_stack_2(
1446 VerificationType::double2_type(),
1447 VerificationType::double_type(), CHECK_VERIFY(this));
1448 current_frame.pop_stack_2(
1449 VerificationType::double2_type(),
1450 VerificationType::double_type(), CHECK_VERIFY(this));
1451 current_frame.push_stack(
1452 VerificationType::integer_type(), CHECK_VERIFY(this));
1453 no_control_flow = false; break;
1454 case Bytecodes::_if_icmpeq:
1455 case Bytecodes::_if_icmpne:
1456 case Bytecodes::_if_icmplt:
1457 case Bytecodes::_if_icmpge:
1458 case Bytecodes::_if_icmpgt:
1459 case Bytecodes::_if_icmple:
1460 current_frame.pop_stack(
1461 VerificationType::integer_type(), CHECK_VERIFY(this));
1462 // fall through
1463 case Bytecodes::_ifeq:
1464 case Bytecodes::_ifne:
1465 case Bytecodes::_iflt:
1466 case Bytecodes::_ifge:
1467 case Bytecodes::_ifgt:
1468 case Bytecodes::_ifle:
1469 current_frame.pop_stack(
1470 VerificationType::integer_type(), CHECK_VERIFY(this));
1471 target = bcs.dest();
1472 stackmap_table.check_jump_target(
1473 ¤t_frame, target, CHECK_VERIFY(this));
1474 no_control_flow = false; break;
1475 case Bytecodes::_if_acmpeq :
1476 case Bytecodes::_if_acmpne :
1477 current_frame.pop_stack(
1478 VerificationType::reference_check(), CHECK_VERIFY(this));
1479 // fall through
1480 case Bytecodes::_ifnull :
1481 case Bytecodes::_ifnonnull :
1482 current_frame.pop_stack(
1483 VerificationType::reference_check(), CHECK_VERIFY(this));
1484 target = bcs.dest();
1485 stackmap_table.check_jump_target
1486 (¤t_frame, target, CHECK_VERIFY(this));
1487 no_control_flow = false; break;
1488 case Bytecodes::_goto :
1489 target = bcs.dest();
1490 stackmap_table.check_jump_target(
1491 ¤t_frame, target, CHECK_VERIFY(this));
1492 no_control_flow = true; break;
1493 case Bytecodes::_goto_w :
1494 target = bcs.dest_w();
1495 stackmap_table.check_jump_target(
1496 ¤t_frame, target, CHECK_VERIFY(this));
1497 no_control_flow = true; break;
1498 case Bytecodes::_tableswitch :
1499 case Bytecodes::_lookupswitch :
1500 verify_switch(
1501 &bcs, code_length, code_data, ¤t_frame,
1502 &stackmap_table, CHECK_VERIFY(this));
1503 no_control_flow = true; break;
1504 case Bytecodes::_ireturn :
1505 type = current_frame.pop_stack(
1506 VerificationType::integer_type(), CHECK_VERIFY(this));
1507 verify_return_value(return_type, type, bci,
1508 ¤t_frame, CHECK_VERIFY(this));
1509 no_control_flow = true; break;
1510 case Bytecodes::_lreturn :
1511 type2 = current_frame.pop_stack(
1512 VerificationType::long2_type(), CHECK_VERIFY(this));
1513 type = current_frame.pop_stack(
1514 VerificationType::long_type(), CHECK_VERIFY(this));
1515 verify_return_value(return_type, type, bci,
1516 ¤t_frame, CHECK_VERIFY(this));
1517 no_control_flow = true; break;
1518 case Bytecodes::_freturn :
1519 type = current_frame.pop_stack(
1520 VerificationType::float_type(), CHECK_VERIFY(this));
1521 verify_return_value(return_type, type, bci,
1522 ¤t_frame, CHECK_VERIFY(this));
1523 no_control_flow = true; break;
1524 case Bytecodes::_dreturn :
1525 type2 = current_frame.pop_stack(
1526 VerificationType::double2_type(), CHECK_VERIFY(this));
1527 type = current_frame.pop_stack(
1528 VerificationType::double_type(), CHECK_VERIFY(this));
1529 verify_return_value(return_type, type, bci,
1530 ¤t_frame, CHECK_VERIFY(this));
1531 no_control_flow = true; break;
1532 case Bytecodes::_areturn :
1533 type = current_frame.pop_stack(
1534 VerificationType::reference_check(), CHECK_VERIFY(this));
1535 verify_return_value(return_type, type, bci,
1536 ¤t_frame, CHECK_VERIFY(this));
1537 no_control_flow = true; break;
1538 case Bytecodes::_return :
1539 if (return_type != VerificationType::bogus_type()) {
1540 verify_error(ErrorContext::bad_code(bci),
1541 "Method expects a return value");
1542 return;
1543 }
1544 // Make sure "this" has been initialized if current method is an
1545 // <init>
1546 if (_method->name() == vmSymbols::object_initializer_name() &&
1547 current_frame.flag_this_uninit()) {
1548 verify_error(ErrorContext::bad_code(bci),
1549 "Constructor must call super() or this() "
1550 "before return");
1551 return;
1552 }
1553 no_control_flow = true; break;
1554 case Bytecodes::_getstatic :
1555 case Bytecodes::_putstatic :
1556 case Bytecodes::_getfield :
1557 case Bytecodes::_putfield :
1558 verify_field_instructions(
1559 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1560 no_control_flow = false; break;
1561 case Bytecodes::_invokevirtual :
1562 case Bytecodes::_invokespecial :
1563 case Bytecodes::_invokestatic :
1564 verify_invoke_instructions(
1565 &bcs, code_length, ¤t_frame,
1566 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1567 no_control_flow = false; break;
1568 case Bytecodes::_invokeinterface :
1569 case Bytecodes::_invokedynamic :
1570 verify_invoke_instructions(
1571 &bcs, code_length, ¤t_frame,
1572 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1573 no_control_flow = false; break;
1574 case Bytecodes::_new :
1575 {
1576 index = bcs.get_index_u2();
1577 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1578 VerificationType new_class_type =
1579 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1580 if (!new_class_type.is_object()) {
1581 verify_error(ErrorContext::bad_type(bci,
1582 TypeOrigin::cp(index, new_class_type)),
1583 "Illegal new instruction");
1584 return;
1585 }
1586 type = VerificationType::uninitialized_type(bci);
1587 current_frame.push_stack(type, CHECK_VERIFY(this));
1588 no_control_flow = false; break;
1589 }
1590 case Bytecodes::_newarray :
1591 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1592 current_frame.pop_stack(
1593 VerificationType::integer_type(), CHECK_VERIFY(this));
1594 current_frame.push_stack(type, CHECK_VERIFY(this));
1595 no_control_flow = false; break;
1596 case Bytecodes::_anewarray :
1597 verify_anewarray(
1598 bci, bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1599 no_control_flow = false; break;
1600 case Bytecodes::_arraylength :
1601 type = current_frame.pop_stack(
1602 VerificationType::reference_check(), CHECK_VERIFY(this));
1603 if (!(type.is_null() || type.is_array())) {
1604 verify_error(ErrorContext::bad_type(
1605 bci, current_frame.stack_top_ctx()),
1606 bad_type_msg, "arraylength");
1607 }
1608 current_frame.push_stack(
1609 VerificationType::integer_type(), CHECK_VERIFY(this));
1610 no_control_flow = false; break;
1611 case Bytecodes::_checkcast :
1612 {
1613 index = bcs.get_index_u2();
1614 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1615 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1616 VerificationType klass_type = cp_index_to_type(
1617 index, cp, CHECK_VERIFY(this));
1618 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1619 no_control_flow = false; break;
1620 }
1621 case Bytecodes::_instanceof : {
1622 index = bcs.get_index_u2();
1623 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1624 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1625 current_frame.push_stack(
1626 VerificationType::integer_type(), CHECK_VERIFY(this));
1627 no_control_flow = false; break;
1628 }
1629 case Bytecodes::_monitorenter :
1630 case Bytecodes::_monitorexit :
1631 current_frame.pop_stack(
1632 VerificationType::reference_check(), CHECK_VERIFY(this));
1633 no_control_flow = false; break;
1634 case Bytecodes::_multianewarray :
1635 {
1636 index = bcs.get_index_u2();
1637 u2 dim = *(bcs.bcp()+3);
1638 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
1639 VerificationType new_array_type =
1640 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1641 if (!new_array_type.is_array()) {
1642 verify_error(ErrorContext::bad_type(bci,
1643 TypeOrigin::cp(index, new_array_type)),
1644 "Illegal constant pool index in multianewarray instruction");
1645 return;
1646 }
1647 if (dim < 1 || new_array_type.dimensions() < dim) {
1648 verify_error(ErrorContext::bad_code(bci),
1649 "Illegal dimension in multianewarray instruction: %d", dim);
1650 return;
1651 }
1652 for (int i = 0; i < dim; i++) {
1653 current_frame.pop_stack(
1654 VerificationType::integer_type(), CHECK_VERIFY(this));
1655 }
1656 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1657 no_control_flow = false; break;
1658 }
1659 case Bytecodes::_athrow :
1660 type = VerificationType::reference_type(
1661 vmSymbols::java_lang_Throwable());
1662 current_frame.pop_stack(type, CHECK_VERIFY(this));
1663 no_control_flow = true; break;
1664 default:
1665 // We only need to check the valid bytecodes in class file.
1666 // And jsr and ret are not in the new class file format in JDK1.5.
1667 verify_error(ErrorContext::bad_code(bci),
1668 "Bad instruction: %02x", opcode);
1669 no_control_flow = false;
1670 return;
1671 } // end switch
1672 } // end Merge with the next instruction
1674 // Look for possible jump target in exception handlers and see if it
1675 // matches current_frame
1676 if (bci >= ex_min && bci < ex_max) {
1677 verify_exception_handler_targets(
1678 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1679 }
1680 } // end while
1682 // Make sure that control flow does not fall through end of the method
1683 if (!no_control_flow) {
1684 verify_error(ErrorContext::bad_code(code_length),
1685 "Control flow falls through code end");
1686 return;
1687 }
1688 }
1690 #undef bad_type_message
1692 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1693 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1694 memset(code_data, 0, sizeof(char) * code_length);
1695 RawBytecodeStream bcs(m);
1697 while (!bcs.is_last_bytecode()) {
1698 if (bcs.raw_next() != Bytecodes::_illegal) {
1699 int bci = bcs.bci();
1700 if (bcs.raw_code() == Bytecodes::_new) {
1701 code_data[bci] = NEW_OFFSET;
1702 } else {
1703 code_data[bci] = BYTECODE_OFFSET;
1704 }
1705 } else {
1706 verify_error(ErrorContext::bad_code(bcs.bci()), "Bad instruction");
1707 return NULL;
1708 }
1709 }
1711 return code_data;
1712 }
1714 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1715 ExceptionTable exhandlers(_method());
1716 int exlength = exhandlers.length();
1717 constantPoolHandle cp (THREAD, _method->constants());
1719 for(int i = 0; i < exlength; i++) {
1720 //reacquire the table in case a GC happened
1721 ExceptionTable exhandlers(_method());
1722 u2 start_pc = exhandlers.start_pc(i);
1723 u2 end_pc = exhandlers.end_pc(i);
1724 u2 handler_pc = exhandlers.handler_pc(i);
1725 if (start_pc >= code_length || code_data[start_pc] == 0) {
1726 class_format_error("Illegal exception table start_pc %d", start_pc);
1727 return;
1728 }
1729 if (end_pc != code_length) { // special case: end_pc == code_length
1730 if (end_pc > code_length || code_data[end_pc] == 0) {
1731 class_format_error("Illegal exception table end_pc %d", end_pc);
1732 return;
1733 }
1734 }
1735 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1736 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1737 return;
1738 }
1739 int catch_type_index = exhandlers.catch_type_index(i);
1740 if (catch_type_index != 0) {
1741 VerificationType catch_type = cp_index_to_type(
1742 catch_type_index, cp, CHECK_VERIFY(this));
1743 VerificationType throwable =
1744 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1745 bool is_subclass = throwable.is_assignable_from(
1746 catch_type, this, false, CHECK_VERIFY(this));
1747 if (!is_subclass) {
1748 // 4286534: should throw VerifyError according to recent spec change
1749 verify_error(ErrorContext::bad_type(handler_pc,
1750 TypeOrigin::cp(catch_type_index, catch_type),
1751 TypeOrigin::implicit(throwable)),
1752 "Catch type is not a subclass "
1753 "of Throwable in exception handler %d", handler_pc);
1754 return;
1755 }
1756 }
1757 if (start_pc < min) min = start_pc;
1758 if (end_pc > max) max = end_pc;
1759 }
1760 }
1762 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1763 int localvariable_table_length = _method()->localvariable_table_length();
1764 if (localvariable_table_length > 0) {
1765 LocalVariableTableElement* table = _method()->localvariable_table_start();
1766 for (int i = 0; i < localvariable_table_length; i++) {
1767 u2 start_bci = table[i].start_bci;
1768 u2 length = table[i].length;
1770 if (start_bci >= code_length || code_data[start_bci] == 0) {
1771 class_format_error(
1772 "Illegal local variable table start_pc %d", start_bci);
1773 return;
1774 }
1775 u4 end_bci = (u4)(start_bci + length);
1776 if (end_bci != code_length) {
1777 if (end_bci >= code_length || code_data[end_bci] == 0) {
1778 class_format_error( "Illegal local variable table length %d", length);
1779 return;
1780 }
1781 }
1782 }
1783 }
1784 }
1786 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1787 StackMapFrame* current_frame,
1788 StackMapTable* stackmap_table,
1789 bool no_control_flow, TRAPS) {
1790 if (stackmap_index < stackmap_table->get_frame_count()) {
1791 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1792 if (no_control_flow && this_offset > bci) {
1793 verify_error(ErrorContext::missing_stackmap(bci),
1794 "Expecting a stack map frame");
1795 return 0;
1796 }
1797 if (this_offset == bci) {
1798 ErrorContext ctx;
1799 // See if current stack map can be assigned to the frame in table.
1800 // current_frame is the stackmap frame got from the last instruction.
1801 // If matched, current_frame will be updated by this method.
1802 bool matches = stackmap_table->match_stackmap(
1803 current_frame, this_offset, stackmap_index,
1804 !no_control_flow, true, false, &ctx, CHECK_VERIFY_(this, 0));
1805 if (!matches) {
1806 // report type error
1807 verify_error(ctx, "Instruction type does not match stack map");
1808 return 0;
1809 }
1810 stackmap_index++;
1811 } else if (this_offset < bci) {
1812 // current_offset should have met this_offset.
1813 class_format_error("Bad stack map offset %d", this_offset);
1814 return 0;
1815 }
1816 } else if (no_control_flow) {
1817 verify_error(ErrorContext::bad_code(bci), "Expecting a stack map frame");
1818 return 0;
1819 }
1820 return stackmap_index;
1821 }
1823 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1824 StackMapTable* stackmap_table, TRAPS) {
1825 constantPoolHandle cp (THREAD, _method->constants());
1826 ExceptionTable exhandlers(_method());
1827 int exlength = exhandlers.length();
1828 for(int i = 0; i < exlength; i++) {
1829 //reacquire the table in case a GC happened
1830 ExceptionTable exhandlers(_method());
1831 u2 start_pc = exhandlers.start_pc(i);
1832 u2 end_pc = exhandlers.end_pc(i);
1833 u2 handler_pc = exhandlers.handler_pc(i);
1834 int catch_type_index = exhandlers.catch_type_index(i);
1835 if(bci >= start_pc && bci < end_pc) {
1836 u1 flags = current_frame->flags();
1837 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1838 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1839 if (catch_type_index != 0) {
1840 // We know that this index refers to a subclass of Throwable
1841 VerificationType catch_type = cp_index_to_type(
1842 catch_type_index, cp, CHECK_VERIFY(this));
1843 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1844 } else {
1845 VerificationType throwable =
1846 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1847 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1848 }
1849 ErrorContext ctx;
1850 bool matches = stackmap_table->match_stackmap(
1851 new_frame, handler_pc, true, false, true, &ctx, CHECK_VERIFY(this));
1852 if (!matches) {
1853 verify_error(ctx, "Stack map does not match the one at "
1854 "exception handler %d", handler_pc);
1855 return;
1856 }
1857 }
1858 }
1859 }
1861 void ClassVerifier::verify_cp_index(
1862 u2 bci, constantPoolHandle cp, int index, TRAPS) {
1863 int nconstants = cp->length();
1864 if ((index <= 0) || (index >= nconstants)) {
1865 verify_error(ErrorContext::bad_cp_index(bci, index),
1866 "Illegal constant pool index %d in class %s",
1867 index, cp->pool_holder()->external_name());
1868 return;
1869 }
1870 }
1872 void ClassVerifier::verify_cp_type(
1873 u2 bci, int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1875 // In some situations, bytecode rewriting may occur while we're verifying.
1876 // In this case, a constant pool cache exists and some indices refer to that
1877 // instead. Be sure we don't pick up such indices by accident.
1878 // We must check was_recursively_verified() before we get here.
1879 guarantee(cp->cache() == NULL, "not rewritten yet");
1881 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1882 unsigned int tag = cp->tag_at(index).value();
1883 if ((types & (1 << tag)) == 0) {
1884 verify_error(ErrorContext::bad_cp_index(bci, index),
1885 "Illegal type at constant pool entry %d in class %s",
1886 index, cp->pool_holder()->external_name());
1887 return;
1888 }
1889 }
1891 void ClassVerifier::verify_cp_class_type(
1892 u2 bci, int index, constantPoolHandle cp, TRAPS) {
1893 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1894 constantTag tag = cp->tag_at(index);
1895 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1896 verify_error(ErrorContext::bad_cp_index(bci, index),
1897 "Illegal type at constant pool entry %d in class %s",
1898 index, cp->pool_holder()->external_name());
1899 return;
1900 }
1901 }
1903 void ClassVerifier::verify_error(ErrorContext ctx, const char* msg, ...) {
1904 stringStream ss;
1906 ctx.reset_frames();
1907 _exception_type = vmSymbols::java_lang_VerifyError();
1908 _error_context = ctx;
1909 va_list va;
1910 va_start(va, msg);
1911 ss.vprint(msg, va);
1912 va_end(va);
1913 _message = ss.as_string();
1914 #ifdef ASSERT
1915 ResourceMark rm;
1916 const char* exception_name = _exception_type->as_C_string();
1917 Exceptions::debug_check_abort(exception_name, NULL);
1918 #endif // ndef ASSERT
1919 }
1921 void ClassVerifier::class_format_error(const char* msg, ...) {
1922 stringStream ss;
1923 _exception_type = vmSymbols::java_lang_ClassFormatError();
1924 va_list va;
1925 va_start(va, msg);
1926 ss.vprint(msg, va);
1927 va_end(va);
1928 if (!_method.is_null()) {
1929 ss.print(" in method %s", _method->name_and_sig_as_C_string());
1930 }
1931 _message = ss.as_string();
1932 }
1934 Klass* ClassVerifier::load_class(Symbol* name, TRAPS) {
1935 // Get current loader and protection domain first.
1936 oop loader = current_class()->class_loader();
1937 oop protection_domain = current_class()->protection_domain();
1939 return SystemDictionary::resolve_or_fail(
1940 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1941 true, CHECK_NULL);
1942 }
1944 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1945 Klass* target_class,
1946 Symbol* field_name,
1947 Symbol* field_sig,
1948 bool is_method) {
1949 No_Safepoint_Verifier nosafepoint;
1951 // If target class isn't a super class of this class, we don't worry about this case
1952 if (!this_class->is_subclass_of(target_class)) {
1953 return false;
1954 }
1955 // Check if the specified method or field is protected
1956 InstanceKlass* target_instance = InstanceKlass::cast(target_class);
1957 fieldDescriptor fd;
1958 if (is_method) {
1959 Method* m = target_instance->uncached_lookup_method(field_name, field_sig, Klass::normal);
1960 if (m != NULL && m->is_protected()) {
1961 if (!this_class->is_same_class_package(m->method_holder())) {
1962 return true;
1963 }
1964 }
1965 } else {
1966 Klass* member_klass = target_instance->find_field(field_name, field_sig, &fd);
1967 if (member_klass != NULL && fd.is_protected()) {
1968 if (!this_class->is_same_class_package(member_klass)) {
1969 return true;
1970 }
1971 }
1972 }
1973 return false;
1974 }
1976 void ClassVerifier::verify_ldc(
1977 int opcode, u2 index, StackMapFrame* current_frame,
1978 constantPoolHandle cp, u2 bci, TRAPS) {
1979 verify_cp_index(bci, cp, index, CHECK_VERIFY(this));
1980 constantTag tag = cp->tag_at(index);
1981 unsigned int types;
1982 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1983 if (!tag.is_unresolved_klass()) {
1984 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1985 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1986 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1987 // Note: The class file parser already verified the legality of
1988 // MethodHandle and MethodType constants.
1989 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1990 }
1991 } else {
1992 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1993 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1994 verify_cp_type(bci, index, cp, types, CHECK_VERIFY(this));
1995 }
1996 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1997 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1998 } else if (tag.is_string()) {
1999 current_frame->push_stack(
2000 VerificationType::reference_type(
2001 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
2002 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
2003 current_frame->push_stack(
2004 VerificationType::reference_type(
2005 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
2006 } else if (tag.is_int()) {
2007 current_frame->push_stack(
2008 VerificationType::integer_type(), CHECK_VERIFY(this));
2009 } else if (tag.is_float()) {
2010 current_frame->push_stack(
2011 VerificationType::float_type(), CHECK_VERIFY(this));
2012 } else if (tag.is_double()) {
2013 current_frame->push_stack_2(
2014 VerificationType::double_type(),
2015 VerificationType::double2_type(), CHECK_VERIFY(this));
2016 } else if (tag.is_long()) {
2017 current_frame->push_stack_2(
2018 VerificationType::long_type(),
2019 VerificationType::long2_type(), CHECK_VERIFY(this));
2020 } else if (tag.is_method_handle()) {
2021 current_frame->push_stack(
2022 VerificationType::reference_type(
2023 vmSymbols::java_lang_invoke_MethodHandle()), CHECK_VERIFY(this));
2024 } else if (tag.is_method_type()) {
2025 current_frame->push_stack(
2026 VerificationType::reference_type(
2027 vmSymbols::java_lang_invoke_MethodType()), CHECK_VERIFY(this));
2028 } else {
2029 /* Unreachable? verify_cp_type has already validated the cp type. */
2030 verify_error(
2031 ErrorContext::bad_cp_index(bci, index), "Invalid index in ldc");
2032 return;
2033 }
2034 }
2036 void ClassVerifier::verify_switch(
2037 RawBytecodeStream* bcs, u4 code_length, char* code_data,
2038 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
2039 int bci = bcs->bci();
2040 address bcp = bcs->bcp();
2041 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
2043 if (_klass->major_version() < NONZERO_PADDING_BYTES_IN_SWITCH_MAJOR_VERSION) {
2044 // 4639449 & 4647081: padding bytes must be 0
2045 u2 padding_offset = 1;
2046 while ((bcp + padding_offset) < aligned_bcp) {
2047 if(*(bcp + padding_offset) != 0) {
2048 verify_error(ErrorContext::bad_code(bci),
2049 "Nonzero padding byte in lookswitch or tableswitch");
2050 return;
2051 }
2052 padding_offset++;
2053 }
2054 }
2056 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
2057 int keys, delta;
2058 current_frame->pop_stack(
2059 VerificationType::integer_type(), CHECK_VERIFY(this));
2060 if (bcs->raw_code() == Bytecodes::_tableswitch) {
2061 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2062 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2063 if (low > high) {
2064 verify_error(ErrorContext::bad_code(bci),
2065 "low must be less than or equal to high in tableswitch");
2066 return;
2067 }
2068 keys = high - low + 1;
2069 if (keys < 0) {
2070 verify_error(ErrorContext::bad_code(bci), "too many keys in tableswitch");
2071 return;
2072 }
2073 delta = 1;
2074 } else {
2075 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2076 if (keys < 0) {
2077 verify_error(ErrorContext::bad_code(bci),
2078 "number of keys in lookupswitch less than 0");
2079 return;
2080 }
2081 delta = 2;
2082 // Make sure that the lookupswitch items are sorted
2083 for (int i = 0; i < (keys - 1); i++) {
2084 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
2085 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
2086 if (this_key >= next_key) {
2087 verify_error(ErrorContext::bad_code(bci),
2088 "Bad lookupswitch instruction");
2089 return;
2090 }
2091 }
2092 }
2093 int target = bci + default_offset;
2094 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
2095 for (int i = 0; i < keys; i++) {
2096 // Because check_jump_target() may safepoint, the bytecode could have
2097 // moved, which means 'aligned_bcp' is no good and needs to be recalculated.
2098 aligned_bcp = (address)round_to((intptr_t)(bcs->bcp() + 1), jintSize);
2099 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2100 stackmap_table->check_jump_target(
2101 current_frame, target, CHECK_VERIFY(this));
2102 }
2103 NOT_PRODUCT(aligned_bcp = NULL); // no longer valid at this point
2104 }
2106 bool ClassVerifier::name_in_supers(
2107 Symbol* ref_name, instanceKlassHandle current) {
2108 Klass* super = current->super();
2109 while (super != NULL) {
2110 if (super->name() == ref_name) {
2111 return true;
2112 }
2113 super = super->super();
2114 }
2115 return false;
2116 }
2118 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
2119 StackMapFrame* current_frame,
2120 constantPoolHandle cp,
2121 TRAPS) {
2122 u2 index = bcs->get_index_u2();
2123 verify_cp_type(bcs->bci(), index, cp,
2124 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
2126 // Get field name and signature
2127 Symbol* field_name = cp->name_ref_at(index);
2128 Symbol* field_sig = cp->signature_ref_at(index);
2130 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
2131 class_format_error(
2132 "Invalid signature for field in class %s referenced "
2133 "from constant pool index %d", _klass->external_name(), index);
2134 return;
2135 }
2137 // Get referenced class type
2138 VerificationType ref_class_type = cp_ref_index_to_type(
2139 index, cp, CHECK_VERIFY(this));
2140 if (!ref_class_type.is_object()) {
2141 /* Unreachable? Class file parser verifies Fieldref contents */
2142 verify_error(ErrorContext::bad_type(bcs->bci(),
2143 TypeOrigin::cp(index, ref_class_type)),
2144 "Expecting reference to class in class %s at constant pool index %d",
2145 _klass->external_name(), index);
2146 return;
2147 }
2148 VerificationType target_class_type = ref_class_type;
2150 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2151 "buffer type must match VerificationType size");
2152 uintptr_t field_type_buffer[2];
2153 VerificationType* field_type = (VerificationType*)field_type_buffer;
2154 // If we make a VerificationType[2] array directly, the compiler calls
2155 // to the c-runtime library to do the allocation instead of just
2156 // stack allocating it. Plus it would run constructors. This shows up
2157 // in performance profiles.
2159 SignatureStream sig_stream(field_sig, false);
2160 VerificationType stack_object_type;
2161 int n = change_sig_to_verificationType(
2162 &sig_stream, field_type, CHECK_VERIFY(this));
2163 u2 bci = bcs->bci();
2164 bool is_assignable;
2165 switch (bcs->raw_code()) {
2166 case Bytecodes::_getstatic: {
2167 for (int i = 0; i < n; i++) {
2168 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2169 }
2170 break;
2171 }
2172 case Bytecodes::_putstatic: {
2173 for (int i = n - 1; i >= 0; i--) {
2174 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2175 }
2176 break;
2177 }
2178 case Bytecodes::_getfield: {
2179 stack_object_type = current_frame->pop_stack(
2180 target_class_type, CHECK_VERIFY(this));
2181 for (int i = 0; i < n; i++) {
2182 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
2183 }
2184 goto check_protected;
2185 }
2186 case Bytecodes::_putfield: {
2187 for (int i = n - 1; i >= 0; i--) {
2188 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
2189 }
2190 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
2192 // The JVMS 2nd edition allows field initialization before the superclass
2193 // initializer, if the field is defined within the current class.
2194 fieldDescriptor fd;
2195 if (stack_object_type == VerificationType::uninitialized_this_type() &&
2196 target_class_type.equals(current_type()) &&
2197 _klass->find_local_field(field_name, field_sig, &fd)) {
2198 stack_object_type = current_type();
2199 }
2200 is_assignable = target_class_type.is_assignable_from(
2201 stack_object_type, this, false, CHECK_VERIFY(this));
2202 if (!is_assignable) {
2203 verify_error(ErrorContext::bad_type(bci,
2204 current_frame->stack_top_ctx(),
2205 TypeOrigin::cp(index, target_class_type)),
2206 "Bad type on operand stack in putfield");
2207 return;
2208 }
2209 }
2210 check_protected: {
2211 if (_this_type == stack_object_type)
2212 break; // stack_object_type must be assignable to _current_class_type
2213 Symbol* ref_class_name =
2214 cp->klass_name_at(cp->klass_ref_index_at(index));
2215 if (!name_in_supers(ref_class_name, current_class()))
2216 // stack_object_type must be assignable to _current_class_type since:
2217 // 1. stack_object_type must be assignable to ref_class.
2218 // 2. ref_class must be _current_class or a subclass of it. It can't
2219 // be a superclass of it. See revised JVMS 5.4.4.
2220 break;
2222 Klass* ref_class_oop = load_class(ref_class_name, CHECK);
2223 if (is_protected_access(current_class(), ref_class_oop, field_name,
2224 field_sig, false)) {
2225 // It's protected access, check if stack object is assignable to
2226 // current class.
2227 is_assignable = current_type().is_assignable_from(
2228 stack_object_type, this, true, CHECK_VERIFY(this));
2229 if (!is_assignable) {
2230 verify_error(ErrorContext::bad_type(bci,
2231 current_frame->stack_top_ctx(),
2232 TypeOrigin::implicit(current_type())),
2233 "Bad access to protected data in getfield");
2234 return;
2235 }
2236 }
2237 break;
2238 }
2239 default: ShouldNotReachHere();
2240 }
2241 }
2243 // Look at the method's handlers. If the bci is in the handler's try block
2244 // then check if the handler_pc is already on the stack. If not, push it.
2245 void ClassVerifier::push_handlers(ExceptionTable* exhandlers,
2246 GrowableArray<u4>* handler_stack,
2247 u4 bci) {
2248 int exlength = exhandlers->length();
2249 for(int x = 0; x < exlength; x++) {
2250 if (bci >= exhandlers->start_pc(x) && bci < exhandlers->end_pc(x)) {
2251 handler_stack->append_if_missing(exhandlers->handler_pc(x));
2252 }
2253 }
2254 }
2256 // Return TRUE if all code paths starting with start_bc_offset end in
2257 // bytecode athrow or loop.
2258 bool ClassVerifier::ends_in_athrow(u4 start_bc_offset) {
2259 ResourceMark rm;
2260 // Create bytecode stream.
2261 RawBytecodeStream bcs(method());
2262 u4 code_length = method()->code_size();
2263 bcs.set_start(start_bc_offset);
2264 u4 target;
2265 // Create stack for storing bytecode start offsets for if* and *switch.
2266 GrowableArray<u4>* bci_stack = new GrowableArray<u4>(30);
2267 // Create stack for handlers for try blocks containing this handler.
2268 GrowableArray<u4>* handler_stack = new GrowableArray<u4>(30);
2269 // Create list of visited branch opcodes (goto* and if*).
2270 GrowableArray<u4>* visited_branches = new GrowableArray<u4>(30);
2271 ExceptionTable exhandlers(_method());
2273 while (true) {
2274 if (bcs.is_last_bytecode()) {
2275 // if no more starting offsets to parse or if at the end of the
2276 // method then return false.
2277 if ((bci_stack->is_empty()) || ((u4)bcs.end_bci() == code_length))
2278 return false;
2279 // Pop a bytecode starting offset and scan from there.
2280 bcs.set_start(bci_stack->pop());
2281 }
2282 Bytecodes::Code opcode = bcs.raw_next();
2283 u4 bci = bcs.bci();
2285 // If the bytecode is in a TRY block, push its handlers so they
2286 // will get parsed.
2287 push_handlers(&exhandlers, handler_stack, bci);
2289 switch (opcode) {
2290 case Bytecodes::_if_icmpeq:
2291 case Bytecodes::_if_icmpne:
2292 case Bytecodes::_if_icmplt:
2293 case Bytecodes::_if_icmpge:
2294 case Bytecodes::_if_icmpgt:
2295 case Bytecodes::_if_icmple:
2296 case Bytecodes::_ifeq:
2297 case Bytecodes::_ifne:
2298 case Bytecodes::_iflt:
2299 case Bytecodes::_ifge:
2300 case Bytecodes::_ifgt:
2301 case Bytecodes::_ifle:
2302 case Bytecodes::_if_acmpeq:
2303 case Bytecodes::_if_acmpne:
2304 case Bytecodes::_ifnull:
2305 case Bytecodes::_ifnonnull:
2306 target = bcs.dest();
2307 if (visited_branches->contains(bci)) {
2308 if (bci_stack->is_empty()) return true;
2309 // Pop a bytecode starting offset and scan from there.
2310 bcs.set_start(bci_stack->pop());
2311 } else {
2312 if (target > bci) { // forward branch
2313 if (target >= code_length) return false;
2314 // Push the branch target onto the stack.
2315 bci_stack->push(target);
2316 // then, scan bytecodes starting with next.
2317 bcs.set_start(bcs.next_bci());
2318 } else { // backward branch
2319 // Push bytecode offset following backward branch onto the stack.
2320 bci_stack->push(bcs.next_bci());
2321 // Check bytecodes starting with branch target.
2322 bcs.set_start(target);
2323 }
2324 // Record target so we don't branch here again.
2325 visited_branches->append(bci);
2326 }
2327 break;
2329 case Bytecodes::_goto:
2330 case Bytecodes::_goto_w:
2331 target = (opcode == Bytecodes::_goto ? bcs.dest() : bcs.dest_w());
2332 if (visited_branches->contains(bci)) {
2333 if (bci_stack->is_empty()) return true;
2334 // Been here before, pop new starting offset from stack.
2335 bcs.set_start(bci_stack->pop());
2336 } else {
2337 if (target >= code_length) return false;
2338 // Continue scanning from the target onward.
2339 bcs.set_start(target);
2340 // Record target so we don't branch here again.
2341 visited_branches->append(bci);
2342 }
2343 break;
2345 // Check that all switch alternatives end in 'athrow' bytecodes. Since it
2346 // is difficult to determine where each switch alternative ends, parse
2347 // each switch alternative until either hit a 'return', 'athrow', or reach
2348 // the end of the method's bytecodes. This is gross but should be okay
2349 // because:
2350 // 1. tableswitch and lookupswitch byte codes in handlers for ctor explicit
2351 // constructor invocations should be rare.
2352 // 2. if each switch alternative ends in an athrow then the parsing should be
2353 // short. If there is no athrow then it is bogus code, anyway.
2354 case Bytecodes::_lookupswitch:
2355 case Bytecodes::_tableswitch:
2356 {
2357 address aligned_bcp = (address) round_to((intptr_t)(bcs.bcp() + 1), jintSize);
2358 u4 default_offset = Bytes::get_Java_u4(aligned_bcp) + bci;
2359 int keys, delta;
2360 if (opcode == Bytecodes::_tableswitch) {
2361 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
2362 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
2363 // This is invalid, but let the regular bytecode verifier
2364 // report this because the user will get a better error message.
2365 if (low > high) return true;
2366 keys = high - low + 1;
2367 delta = 1;
2368 } else {
2369 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
2370 delta = 2;
2371 }
2372 // Invalid, let the regular bytecode verifier deal with it.
2373 if (keys < 0) return true;
2375 // Push the offset of the next bytecode onto the stack.
2376 bci_stack->push(bcs.next_bci());
2378 // Push the switch alternatives onto the stack.
2379 for (int i = 0; i < keys; i++) {
2380 u4 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
2381 if (target > code_length) return false;
2382 bci_stack->push(target);
2383 }
2385 // Start bytecode parsing for the switch at the default alternative.
2386 if (default_offset > code_length) return false;
2387 bcs.set_start(default_offset);
2388 break;
2389 }
2391 case Bytecodes::_return:
2392 return false;
2394 case Bytecodes::_athrow:
2395 {
2396 if (bci_stack->is_empty()) {
2397 if (handler_stack->is_empty()) {
2398 return true;
2399 } else {
2400 // Parse the catch handlers for try blocks containing athrow.
2401 bcs.set_start(handler_stack->pop());
2402 }
2403 } else {
2404 // Pop a bytecode offset and starting scanning from there.
2405 bcs.set_start(bci_stack->pop());
2406 }
2407 }
2408 break;
2410 default:
2411 ;
2412 } // end switch
2413 } // end while loop
2415 return false;
2416 }
2418 void ClassVerifier::verify_invoke_init(
2419 RawBytecodeStream* bcs, u2 ref_class_index, VerificationType ref_class_type,
2420 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
2421 constantPoolHandle cp, TRAPS) {
2422 u2 bci = bcs->bci();
2423 VerificationType type = current_frame->pop_stack(
2424 VerificationType::reference_check(), CHECK_VERIFY(this));
2425 if (type == VerificationType::uninitialized_this_type()) {
2426 // The method must be an <init> method of this class or its superclass
2427 Klass* superk = current_class()->super();
2428 if (ref_class_type.name() != current_class()->name() &&
2429 ref_class_type.name() != superk->name()) {
2430 verify_error(ErrorContext::bad_type(bci,
2431 TypeOrigin::implicit(ref_class_type),
2432 TypeOrigin::implicit(current_type())),
2433 "Bad <init> method call");
2434 return;
2435 }
2437 // Check if this call is done from inside of a TRY block. If so, make
2438 // sure that all catch clause paths end in a throw. Otherwise, this
2439 // can result in returning an incomplete object.
2440 ExceptionTable exhandlers(_method());
2441 int exlength = exhandlers.length();
2442 for(int i = 0; i < exlength; i++) {
2443 u2 start_pc = exhandlers.start_pc(i);
2444 u2 end_pc = exhandlers.end_pc(i);
2446 if (bci >= start_pc && bci < end_pc) {
2447 if (!ends_in_athrow(exhandlers.handler_pc(i))) {
2448 verify_error(ErrorContext::bad_code(bci),
2449 "Bad <init> method call from after the start of a try block");
2450 return;
2451 } else if (VerboseVerification) {
2452 ResourceMark rm;
2453 tty->print_cr(
2454 "Survived call to ends_in_athrow(): %s",
2455 current_class()->name()->as_C_string());
2456 }
2457 }
2458 }
2460 current_frame->initialize_object(type, current_type());
2461 *this_uninit = true;
2462 } else if (type.is_uninitialized()) {
2463 u2 new_offset = type.bci();
2464 address new_bcp = bcs->bcp() - bci + new_offset;
2465 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
2466 /* Unreachable? Stack map parsing ensures valid type and new
2467 * instructions have a valid BCI. */
2468 verify_error(ErrorContext::bad_code(new_offset),
2469 "Expecting new instruction");
2470 return;
2471 }
2472 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
2473 verify_cp_class_type(bci, new_class_index, cp, CHECK_VERIFY(this));
2475 // The method must be an <init> method of the indicated class
2476 VerificationType new_class_type = cp_index_to_type(
2477 new_class_index, cp, CHECK_VERIFY(this));
2478 if (!new_class_type.equals(ref_class_type)) {
2479 verify_error(ErrorContext::bad_type(bci,
2480 TypeOrigin::cp(new_class_index, new_class_type),
2481 TypeOrigin::cp(ref_class_index, ref_class_type)),
2482 "Call to wrong <init> method");
2483 return;
2484 }
2485 // According to the VM spec, if the referent class is a superclass of the
2486 // current class, and is in a different runtime package, and the method is
2487 // protected, then the objectref must be the current class or a subclass
2488 // of the current class.
2489 VerificationType objectref_type = new_class_type;
2490 if (name_in_supers(ref_class_type.name(), current_class())) {
2491 Klass* ref_klass = load_class(
2492 ref_class_type.name(), CHECK_VERIFY(this));
2493 Method* m = InstanceKlass::cast(ref_klass)->uncached_lookup_method(
2494 vmSymbols::object_initializer_name(),
2495 cp->signature_ref_at(bcs->get_index_u2()), Klass::normal);
2496 // Do nothing if method is not found. Let resolution detect the error.
2497 if (m != NULL) {
2498 instanceKlassHandle mh(THREAD, m->method_holder());
2499 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
2500 bool assignable = current_type().is_assignable_from(
2501 objectref_type, this, true, CHECK_VERIFY(this));
2502 if (!assignable) {
2503 verify_error(ErrorContext::bad_type(bci,
2504 TypeOrigin::cp(new_class_index, objectref_type),
2505 TypeOrigin::implicit(current_type())),
2506 "Bad access to protected <init> method");
2507 return;
2508 }
2509 }
2510 }
2511 }
2512 current_frame->initialize_object(type, new_class_type);
2513 } else {
2514 verify_error(ErrorContext::bad_type(bci, current_frame->stack_top_ctx()),
2515 "Bad operand type when invoking <init>");
2516 return;
2517 }
2518 }
2520 bool ClassVerifier::is_same_or_direct_interface(
2521 instanceKlassHandle klass,
2522 VerificationType klass_type,
2523 VerificationType ref_class_type) {
2524 if (ref_class_type.equals(klass_type)) return true;
2525 Array<Klass*>* local_interfaces = klass->local_interfaces();
2526 if (local_interfaces != NULL) {
2527 for (int x = 0; x < local_interfaces->length(); x++) {
2528 Klass* k = local_interfaces->at(x);
2529 assert (k != NULL && k->is_interface(), "invalid interface");
2530 if (ref_class_type.equals(VerificationType::reference_type(k->name()))) {
2531 return true;
2532 }
2533 }
2534 }
2535 return false;
2536 }
2538 void ClassVerifier::verify_invoke_instructions(
2539 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
2540 bool *this_uninit, VerificationType return_type,
2541 constantPoolHandle cp, TRAPS) {
2542 // Make sure the constant pool item is the right type
2543 u2 index = bcs->get_index_u2();
2544 Bytecodes::Code opcode = bcs->raw_code();
2545 unsigned int types;
2546 switch (opcode) {
2547 case Bytecodes::_invokeinterface:
2548 types = 1 << JVM_CONSTANT_InterfaceMethodref;
2549 break;
2550 case Bytecodes::_invokedynamic:
2551 types = 1 << JVM_CONSTANT_InvokeDynamic;
2552 break;
2553 case Bytecodes::_invokespecial:
2554 case Bytecodes::_invokestatic:
2555 types = (_klass->major_version() < STATIC_METHOD_IN_INTERFACE_MAJOR_VERSION) ?
2556 (1 << JVM_CONSTANT_Methodref) :
2557 ((1 << JVM_CONSTANT_InterfaceMethodref) | (1 << JVM_CONSTANT_Methodref));
2558 break;
2559 default:
2560 types = 1 << JVM_CONSTANT_Methodref;
2561 }
2562 verify_cp_type(bcs->bci(), index, cp, types, CHECK_VERIFY(this));
2564 // Get method name and signature
2565 Symbol* method_name = cp->name_ref_at(index);
2566 Symbol* method_sig = cp->signature_ref_at(index);
2568 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
2569 class_format_error(
2570 "Invalid method signature in class %s referenced "
2571 "from constant pool index %d", _klass->external_name(), index);
2572 return;
2573 }
2575 // Get referenced class type
2576 VerificationType ref_class_type;
2577 if (opcode == Bytecodes::_invokedynamic) {
2578 if (!EnableInvokeDynamic ||
2579 _klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2580 if (!EnableInvokeDynamic) {
2581 class_format_error("invokedynamic instructions not enabled in this JVM");
2582 } else {
2583 class_format_error("invokedynamic instructions not supported by this class file version (%d), class %s",
2584 _klass->major_version(), _klass->external_name());
2585 }
2586 return;
2587 }
2588 } else {
2589 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
2590 }
2592 // For a small signature length, we just allocate 128 bytes instead
2593 // of parsing the signature once to find its size.
2594 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
2595 // longs/doubles to be consertive.
2596 assert(sizeof(VerificationType) == sizeof(uintptr_t),
2597 "buffer type must match VerificationType size");
2598 uintptr_t on_stack_sig_types_buffer[128];
2599 // If we make a VerificationType[128] array directly, the compiler calls
2600 // to the c-runtime library to do the allocation instead of just
2601 // stack allocating it. Plus it would run constructors. This shows up
2602 // in performance profiles.
2604 VerificationType* sig_types;
2605 int size = (method_sig->utf8_length() - 3) * 2;
2606 if (size > 128) {
2607 // Long and double occupies two slots here.
2608 ArgumentSizeComputer size_it(method_sig);
2609 size = size_it.size();
2610 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
2611 } else{
2612 sig_types = (VerificationType*)on_stack_sig_types_buffer;
2613 }
2614 SignatureStream sig_stream(method_sig);
2615 int sig_i = 0;
2616 while (!sig_stream.at_return_type()) {
2617 sig_i += change_sig_to_verificationType(
2618 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2619 sig_stream.next();
2620 }
2621 int nargs = sig_i;
2623 #ifdef ASSERT
2624 {
2625 ArgumentSizeComputer size_it(method_sig);
2626 assert(nargs == size_it.size(), "Argument sizes do not match");
2627 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2628 }
2629 #endif
2631 // Check instruction operands
2632 u2 bci = bcs->bci();
2633 if (opcode == Bytecodes::_invokeinterface) {
2634 address bcp = bcs->bcp();
2635 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2636 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2637 // the difference between the size of the operand stack before and after the instruction
2638 // executes.
2639 if (*(bcp+3) != (nargs+1)) {
2640 verify_error(ErrorContext::bad_code(bci),
2641 "Inconsistent args count operand in invokeinterface");
2642 return;
2643 }
2644 if (*(bcp+4) != 0) {
2645 verify_error(ErrorContext::bad_code(bci),
2646 "Fourth operand byte of invokeinterface must be zero");
2647 return;
2648 }
2649 }
2651 if (opcode == Bytecodes::_invokedynamic) {
2652 address bcp = bcs->bcp();
2653 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2654 verify_error(ErrorContext::bad_code(bci),
2655 "Third and fourth operand bytes of invokedynamic must be zero");
2656 return;
2657 }
2658 }
2660 if (method_name->byte_at(0) == '<') {
2661 // Make sure <init> can only be invoked by invokespecial
2662 if (opcode != Bytecodes::_invokespecial ||
2663 method_name != vmSymbols::object_initializer_name()) {
2664 verify_error(ErrorContext::bad_code(bci),
2665 "Illegal call to internal method");
2666 return;
2667 }
2668 } else if (opcode == Bytecodes::_invokespecial
2669 && !is_same_or_direct_interface(current_class(), current_type(), ref_class_type)
2670 && !ref_class_type.equals(VerificationType::reference_type(
2671 current_class()->super()->name()))) {
2672 bool subtype = false;
2673 bool have_imr_indirect = cp->tag_at(index).value() == JVM_CONSTANT_InterfaceMethodref;
2674 if (!current_class()->is_anonymous()) {
2675 subtype = ref_class_type.is_assignable_from(
2676 current_type(), this, false, CHECK_VERIFY(this));
2677 } else {
2678 VerificationType host_klass_type =
2679 VerificationType::reference_type(current_class()->host_klass()->name());
2680 subtype = ref_class_type.is_assignable_from(host_klass_type, this, false, CHECK_VERIFY(this));
2682 // If invokespecial of IMR, need to recheck for same or
2683 // direct interface relative to the host class
2684 have_imr_indirect = (have_imr_indirect &&
2685 !is_same_or_direct_interface(
2686 InstanceKlass::cast(current_class()->host_klass()),
2687 host_klass_type, ref_class_type));
2688 }
2689 if (!subtype) {
2690 verify_error(ErrorContext::bad_code(bci),
2691 "Bad invokespecial instruction: "
2692 "current class isn't assignable to reference class.");
2693 return;
2694 } else if (have_imr_indirect) {
2695 verify_error(ErrorContext::bad_code(bci),
2696 "Bad invokespecial instruction: "
2697 "interface method reference is in an indirect superinterface.");
2698 return;
2699 }
2701 }
2702 // Match method descriptor with operand stack
2703 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2704 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2705 }
2706 // Check objectref on operand stack
2707 if (opcode != Bytecodes::_invokestatic &&
2708 opcode != Bytecodes::_invokedynamic) {
2709 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2710 verify_invoke_init(bcs, index, ref_class_type, current_frame,
2711 code_length, this_uninit, cp, CHECK_VERIFY(this));
2712 } else { // other methods
2713 // Ensures that target class is assignable to method class.
2714 if (opcode == Bytecodes::_invokespecial) {
2715 if (!current_class()->is_anonymous()) {
2716 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2717 } else {
2718 // anonymous class invokespecial calls: check if the
2719 // objectref is a subtype of the host_klass of the current class
2720 // to allow an anonymous class to reference methods in the host_klass
2721 VerificationType top = current_frame->pop_stack(CHECK_VERIFY(this));
2722 VerificationType hosttype =
2723 VerificationType::reference_type(current_class()->host_klass()->name());
2724 bool subtype = hosttype.is_assignable_from(top, this, false, CHECK_VERIFY(this));
2725 if (!subtype) {
2726 verify_error( ErrorContext::bad_type(current_frame->offset(),
2727 current_frame->stack_top_ctx(),
2728 TypeOrigin::implicit(top)),
2729 "Bad type on operand stack");
2730 return;
2731 }
2732 }
2733 } else if (opcode == Bytecodes::_invokevirtual) {
2734 VerificationType stack_object_type =
2735 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2736 if (current_type() != stack_object_type) {
2737 assert(cp->cache() == NULL, "not rewritten yet");
2738 Symbol* ref_class_name =
2739 cp->klass_name_at(cp->klass_ref_index_at(index));
2740 // See the comments in verify_field_instructions() for
2741 // the rationale behind this.
2742 if (name_in_supers(ref_class_name, current_class())) {
2743 Klass* ref_class = load_class(ref_class_name, CHECK);
2744 if (is_protected_access(
2745 _klass, ref_class, method_name, method_sig, true)) {
2746 // It's protected access, check if stack object is
2747 // assignable to current class.
2748 bool is_assignable = current_type().is_assignable_from(
2749 stack_object_type, this, true, CHECK_VERIFY(this));
2750 if (!is_assignable) {
2751 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2752 && stack_object_type.is_array()
2753 && method_name == vmSymbols::clone_name()) {
2754 // Special case: arrays pretend to implement public Object
2755 // clone().
2756 } else {
2757 verify_error(ErrorContext::bad_type(bci,
2758 current_frame->stack_top_ctx(),
2759 TypeOrigin::implicit(current_type())),
2760 "Bad access to protected data in invokevirtual");
2761 return;
2762 }
2763 }
2764 }
2765 }
2766 }
2767 } else {
2768 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2769 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2770 }
2771 }
2772 }
2773 // Push the result type.
2774 if (sig_stream.type() != T_VOID) {
2775 if (method_name == vmSymbols::object_initializer_name()) {
2776 // <init> method must have a void return type
2777 /* Unreachable? Class file parser verifies that methods with '<' have
2778 * void return */
2779 verify_error(ErrorContext::bad_code(bci),
2780 "Return type must be void in <init> method");
2781 return;
2782 }
2783 VerificationType return_type[2];
2784 int n = change_sig_to_verificationType(
2785 &sig_stream, return_type, CHECK_VERIFY(this));
2786 for (int i = 0; i < n; i++) {
2787 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2788 }
2789 }
2790 }
2792 VerificationType ClassVerifier::get_newarray_type(
2793 u2 index, u2 bci, TRAPS) {
2794 const char* from_bt[] = {
2795 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2796 };
2797 if (index < T_BOOLEAN || index > T_LONG) {
2798 verify_error(ErrorContext::bad_code(bci), "Illegal newarray instruction");
2799 return VerificationType::bogus_type();
2800 }
2802 // from_bt[index] contains the array signature which has a length of 2
2803 Symbol* sig = create_temporary_symbol(
2804 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2805 return VerificationType::reference_type(sig);
2806 }
2808 void ClassVerifier::verify_anewarray(
2809 u2 bci, u2 index, constantPoolHandle cp,
2810 StackMapFrame* current_frame, TRAPS) {
2811 verify_cp_class_type(bci, index, cp, CHECK_VERIFY(this));
2812 current_frame->pop_stack(
2813 VerificationType::integer_type(), CHECK_VERIFY(this));
2815 VerificationType component_type =
2816 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2817 int length;
2818 char* arr_sig_str;
2819 if (component_type.is_array()) { // it's an array
2820 const char* component_name = component_type.name()->as_utf8();
2821 // add one dimension to component
2822 length = (int)strlen(component_name) + 1;
2823 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2824 arr_sig_str[0] = '[';
2825 strncpy(&arr_sig_str[1], component_name, length - 1);
2826 } else { // it's an object or interface
2827 const char* component_name = component_type.name()->as_utf8();
2828 // add one dimension to component with 'L' prepended and ';' postpended.
2829 length = (int)strlen(component_name) + 3;
2830 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2831 arr_sig_str[0] = '[';
2832 arr_sig_str[1] = 'L';
2833 strncpy(&arr_sig_str[2], component_name, length - 2);
2834 arr_sig_str[length - 1] = ';';
2835 }
2836 Symbol* arr_sig = create_temporary_symbol(
2837 arr_sig_str, length, CHECK_VERIFY(this));
2838 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2839 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2840 }
2842 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2843 current_frame->get_local(
2844 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2845 current_frame->push_stack(
2846 VerificationType::integer_type(), CHECK_VERIFY(this));
2847 }
2849 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2850 current_frame->get_local_2(
2851 index, VerificationType::long_type(),
2852 VerificationType::long2_type(), CHECK_VERIFY(this));
2853 current_frame->push_stack_2(
2854 VerificationType::long_type(),
2855 VerificationType::long2_type(), CHECK_VERIFY(this));
2856 }
2858 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2859 current_frame->get_local(
2860 index, VerificationType::float_type(), CHECK_VERIFY(this));
2861 current_frame->push_stack(
2862 VerificationType::float_type(), CHECK_VERIFY(this));
2863 }
2865 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2866 current_frame->get_local_2(
2867 index, VerificationType::double_type(),
2868 VerificationType::double2_type(), CHECK_VERIFY(this));
2869 current_frame->push_stack_2(
2870 VerificationType::double_type(),
2871 VerificationType::double2_type(), CHECK_VERIFY(this));
2872 }
2874 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2875 VerificationType type = current_frame->get_local(
2876 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2877 current_frame->push_stack(type, CHECK_VERIFY(this));
2878 }
2880 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2881 current_frame->pop_stack(
2882 VerificationType::integer_type(), CHECK_VERIFY(this));
2883 current_frame->set_local(
2884 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2885 }
2887 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2888 current_frame->pop_stack_2(
2889 VerificationType::long2_type(),
2890 VerificationType::long_type(), CHECK_VERIFY(this));
2891 current_frame->set_local_2(
2892 index, VerificationType::long_type(),
2893 VerificationType::long2_type(), CHECK_VERIFY(this));
2894 }
2896 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2897 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2898 current_frame->set_local(
2899 index, VerificationType::float_type(), CHECK_VERIFY(this));
2900 }
2902 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2903 current_frame->pop_stack_2(
2904 VerificationType::double2_type(),
2905 VerificationType::double_type(), CHECK_VERIFY(this));
2906 current_frame->set_local_2(
2907 index, VerificationType::double_type(),
2908 VerificationType::double2_type(), CHECK_VERIFY(this));
2909 }
2911 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2912 VerificationType type = current_frame->pop_stack(
2913 VerificationType::reference_check(), CHECK_VERIFY(this));
2914 current_frame->set_local(index, type, CHECK_VERIFY(this));
2915 }
2917 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2918 VerificationType type = current_frame->get_local(
2919 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2920 current_frame->set_local(index, type, CHECK_VERIFY(this));
2921 }
2923 void ClassVerifier::verify_return_value(
2924 VerificationType return_type, VerificationType type, u2 bci,
2925 StackMapFrame* current_frame, TRAPS) {
2926 if (return_type == VerificationType::bogus_type()) {
2927 verify_error(ErrorContext::bad_type(bci,
2928 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2929 "Method expects a return value");
2930 return;
2931 }
2932 bool match = return_type.is_assignable_from(type, this, false, CHECK_VERIFY(this));
2933 if (!match) {
2934 verify_error(ErrorContext::bad_type(bci,
2935 current_frame->stack_top_ctx(), TypeOrigin::signature(return_type)),
2936 "Bad return type");
2937 return;
2938 }
2939 }
2941 // The verifier creates symbols which are substrings of Symbols.
2942 // These are stored in the verifier until the end of verification so that
2943 // they can be reference counted.
2944 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2945 int end, TRAPS) {
2946 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2947 _symbols->push(sym);
2948 return sym;
2949 }
2951 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2952 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2953 _symbols->push(sym);
2954 return sym;
2955 }
