Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/classfile/verifier.cpp@3582bf76420e
src/share/vm/classfile/verifier.cpp
Thu, 27 Jan 2011 16:11:27 -0800
- author
- coleenp
- date
- Thu, 27 Jan 2011 16:11:27 -0800
- changeset 2497
- 3582bf76420e
- parent 2322
- 828eafbd85cc
- child 2508
- b92c45f2bc75
- permissions
- -rw-r--r--
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
1 /*
2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/stackMapTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/verifier.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/bytecodeStream.hpp"
33 #include "memory/oopFactory.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "oops/instanceKlass.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "oops/typeArrayOop.hpp"
38 #include "prims/jvm.h"
39 #include "runtime/fieldDescriptor.hpp"
40 #include "runtime/handles.inline.hpp"
41 #include "runtime/interfaceSupport.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/orderAccess.hpp"
44 #include "runtime/os.hpp"
45 #ifdef TARGET_ARCH_x86
46 # include "bytes_x86.hpp"
47 #endif
48 #ifdef TARGET_ARCH_sparc
49 # include "bytes_sparc.hpp"
50 #endif
51 #ifdef TARGET_ARCH_zero
52 # include "bytes_zero.hpp"
53 #endif
55 #define NOFAILOVER_MAJOR_VERSION 51
57 // Access to external entry for VerifyClassCodes - old byte code verifier
59 extern "C" {
60 typedef jboolean (*verify_byte_codes_fn_t)(JNIEnv *, jclass, char *, jint);
61 typedef jboolean (*verify_byte_codes_fn_new_t)(JNIEnv *, jclass, char *, jint, jint);
62 }
64 static void* volatile _verify_byte_codes_fn = NULL;
66 static volatile jint _is_new_verify_byte_codes_fn = (jint) true;
68 static void* verify_byte_codes_fn() {
69 if (_verify_byte_codes_fn == NULL) {
70 void *lib_handle = os::native_java_library();
71 void *func = os::dll_lookup(lib_handle, "VerifyClassCodesForMajorVersion");
72 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
73 if (func == NULL) {
74 OrderAccess::release_store(&_is_new_verify_byte_codes_fn, false);
75 func = os::dll_lookup(lib_handle, "VerifyClassCodes");
76 OrderAccess::release_store_ptr(&_verify_byte_codes_fn, func);
77 }
78 }
79 return (void*)_verify_byte_codes_fn;
80 }
83 // Methods in Verifier
85 bool Verifier::should_verify_for(oop class_loader, bool should_verify_class) {
86 return (class_loader == NULL || !should_verify_class) ?
87 BytecodeVerificationLocal : BytecodeVerificationRemote;
88 }
90 bool Verifier::relax_verify_for(oop loader) {
91 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
92 bool need_verify =
93 // verifyAll
94 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
95 // verifyRemote
96 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
97 return !need_verify;
98 }
100 bool Verifier::verify(instanceKlassHandle klass, Verifier::Mode mode, bool should_verify_class, TRAPS) {
101 HandleMark hm;
102 ResourceMark rm(THREAD);
104 Symbol* exception_name = NULL;
105 const size_t message_buffer_len = klass->name()->utf8_length() + 1024;
106 char* message_buffer = NEW_RESOURCE_ARRAY(char, message_buffer_len);
108 const char* klassName = klass->external_name();
110 // If the class should be verified, first see if we can use the split
111 // verifier. If not, or if verification fails and FailOverToOldVerifier
112 // is set, then call the inference verifier.
113 if (is_eligible_for_verification(klass, should_verify_class)) {
114 if (TraceClassInitialization) {
115 tty->print_cr("Start class verification for: %s", klassName);
116 }
117 if (UseSplitVerifier &&
118 klass->major_version() >= STACKMAP_ATTRIBUTE_MAJOR_VERSION) {
119 ClassVerifier split_verifier(
120 klass, message_buffer, message_buffer_len, THREAD);
121 split_verifier.verify_class(THREAD);
122 exception_name = split_verifier.result();
123 if (klass->major_version() < NOFAILOVER_MAJOR_VERSION &&
124 FailOverToOldVerifier && !HAS_PENDING_EXCEPTION &&
125 (exception_name == vmSymbols::java_lang_VerifyError() ||
126 exception_name == vmSymbols::java_lang_ClassFormatError())) {
127 if (TraceClassInitialization) {
128 tty->print_cr(
129 "Fail over class verification to old verifier for: %s", klassName);
130 }
131 exception_name = inference_verify(
132 klass, message_buffer, message_buffer_len, THREAD);
133 }
134 } else {
135 exception_name = inference_verify(
136 klass, message_buffer, message_buffer_len, THREAD);
137 }
139 if (TraceClassInitialization) {
140 if (HAS_PENDING_EXCEPTION) {
141 tty->print("Verification for %s has", klassName);
142 tty->print_cr(" exception pending %s ",
143 instanceKlass::cast(PENDING_EXCEPTION->klass())->external_name());
144 } else if (exception_name != NULL) {
145 tty->print_cr("Verification for %s failed", klassName);
146 }
147 tty->print_cr("End class verification for: %s", klassName);
148 }
149 }
151 if (HAS_PENDING_EXCEPTION) {
152 return false; // use the existing exception
153 } else if (exception_name == NULL) {
154 return true; // verifcation succeeded
155 } else { // VerifyError or ClassFormatError to be created and thrown
156 ResourceMark rm(THREAD);
157 instanceKlassHandle kls =
158 SystemDictionary::resolve_or_fail(exception_name, true, CHECK_false);
159 while (!kls.is_null()) {
160 if (kls == klass) {
161 // If the class being verified is the exception we're creating
162 // or one of it's superclasses, we're in trouble and are going
163 // to infinitely recurse when we try to initialize the exception.
164 // So bail out here by throwing the preallocated VM error.
165 THROW_OOP_(Universe::virtual_machine_error_instance(), false);
166 }
167 kls = kls->super();
168 }
169 message_buffer[message_buffer_len - 1] = '\0'; // just to be sure
170 THROW_MSG_(exception_name, message_buffer, false);
171 }
172 }
174 bool Verifier::is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class) {
175 Symbol* name = klass->name();
176 klassOop refl_magic_klass = SystemDictionary::reflect_MagicAccessorImpl_klass();
178 return (should_verify_for(klass->class_loader(), should_verify_class) &&
179 // return if the class is a bootstrapping class
180 // or defineClass specified not to verify by default (flags override passed arg)
181 // We need to skip the following four for bootstraping
182 name != vmSymbols::java_lang_Object() &&
183 name != vmSymbols::java_lang_Class() &&
184 name != vmSymbols::java_lang_String() &&
185 name != vmSymbols::java_lang_Throwable() &&
187 // Can not verify the bytecodes for shared classes because they have
188 // already been rewritten to contain constant pool cache indices,
189 // which the verifier can't understand.
190 // Shared classes shouldn't have stackmaps either.
191 !klass()->is_shared() &&
193 // As of the fix for 4486457 we disable verification for all of the
194 // dynamically-generated bytecodes associated with the 1.4
195 // reflection implementation, not just those associated with
196 // sun/reflect/SerializationConstructorAccessor.
197 // NOTE: this is called too early in the bootstrapping process to be
198 // guarded by Universe::is_gte_jdk14x_version()/UseNewReflection.
199 (refl_magic_klass == NULL ||
200 !klass->is_subtype_of(refl_magic_klass) ||
201 VerifyReflectionBytecodes)
202 );
203 }
205 Symbol* Verifier::inference_verify(
206 instanceKlassHandle klass, char* message, size_t message_len, TRAPS) {
207 JavaThread* thread = (JavaThread*)THREAD;
208 JNIEnv *env = thread->jni_environment();
210 void* verify_func = verify_byte_codes_fn();
212 if (verify_func == NULL) {
213 jio_snprintf(message, message_len, "Could not link verifier");
214 return vmSymbols::java_lang_VerifyError();
215 }
217 ResourceMark rm(THREAD);
218 if (ClassVerifier::_verify_verbose) {
219 tty->print_cr("Verifying class %s with old format", klass->external_name());
220 }
222 jclass cls = (jclass) JNIHandles::make_local(env, klass->java_mirror());
223 jint result;
225 {
226 HandleMark hm(thread);
227 ThreadToNativeFromVM ttn(thread);
228 // ThreadToNativeFromVM takes care of changing thread_state, so safepoint
229 // code knows that we have left the VM
231 if (_is_new_verify_byte_codes_fn) {
232 verify_byte_codes_fn_new_t func =
233 CAST_TO_FN_PTR(verify_byte_codes_fn_new_t, verify_func);
234 result = (*func)(env, cls, message, (int)message_len,
235 klass->major_version());
236 } else {
237 verify_byte_codes_fn_t func =
238 CAST_TO_FN_PTR(verify_byte_codes_fn_t, verify_func);
239 result = (*func)(env, cls, message, (int)message_len);
240 }
241 }
243 JNIHandles::destroy_local(cls);
245 // These numbers are chosen so that VerifyClassCodes interface doesn't need
246 // to be changed (still return jboolean (unsigned char)), and result is
247 // 1 when verification is passed.
248 if (result == 0) {
249 return vmSymbols::java_lang_VerifyError();
250 } else if (result == 1) {
251 return NULL; // verified.
252 } else if (result == 2) {
253 THROW_MSG_(vmSymbols::java_lang_OutOfMemoryError(), message, NULL);
254 } else if (result == 3) {
255 return vmSymbols::java_lang_ClassFormatError();
256 } else {
257 ShouldNotReachHere();
258 return NULL;
259 }
260 }
262 // Methods in ClassVerifier
264 bool ClassVerifier::_verify_verbose = false;
266 ClassVerifier::ClassVerifier(
267 instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS)
268 : _thread(THREAD), _exception_type(NULL), _message(msg),
269 _message_buffer_len(msg_len), _klass(klass) {
270 _this_type = VerificationType::reference_type(klass->name());
271 // Create list to hold symbols in reference area.
272 _symbols = new GrowableArray<Symbol*>(100, 0, NULL);
273 }
275 ClassVerifier::~ClassVerifier() {
276 // Decrement the reference count for any symbols created.
277 for (int i = 0; i < _symbols->length(); i++) {
278 Symbol* s = _symbols->at(i);
279 s->decrement_refcount();
280 }
281 }
283 VerificationType ClassVerifier::object_type() const {
284 return VerificationType::reference_type(vmSymbols::java_lang_Object());
285 }
287 void ClassVerifier::verify_class(TRAPS) {
288 if (_verify_verbose) {
289 tty->print_cr("Verifying class %s with new format",
290 _klass->external_name());
291 }
293 objArrayHandle methods(THREAD, _klass->methods());
294 int num_methods = methods->length();
296 for (int index = 0; index < num_methods; index++) {
297 // Check for recursive re-verification before each method.
298 if (was_recursively_verified()) return;
300 methodOop m = (methodOop)methods->obj_at(index);
301 if (m->is_native() || m->is_abstract()) {
302 // If m is native or abstract, skip it. It is checked in class file
303 // parser that methods do not override a final method.
304 continue;
305 }
306 verify_method(methodHandle(THREAD, m), CHECK_VERIFY(this));
307 }
309 if (_verify_verbose || TraceClassInitialization) {
310 if (was_recursively_verified())
311 tty->print_cr("Recursive verification detected for: %s",
312 _klass->external_name());
313 }
314 }
316 void ClassVerifier::verify_method(methodHandle m, TRAPS) {
317 _method = m; // initialize _method
318 if (_verify_verbose) {
319 tty->print_cr("Verifying method %s", m->name_and_sig_as_C_string());
320 }
322 const char* bad_type_msg = "Bad type on operand stack in %s";
324 int32_t max_stack = m->max_stack();
325 int32_t max_locals = m->max_locals();
326 constantPoolHandle cp(THREAD, m->constants());
328 if (!SignatureVerifier::is_valid_method_signature(m->signature())) {
329 class_format_error("Invalid method signature");
330 return;
331 }
333 // Initial stack map frame: offset is 0, stack is initially empty.
334 StackMapFrame current_frame(max_locals, max_stack, this);
335 // Set initial locals
336 VerificationType return_type = current_frame.set_locals_from_arg(
337 m, current_type(), CHECK_VERIFY(this));
339 int32_t stackmap_index = 0; // index to the stackmap array
341 u4 code_length = m->code_size();
343 // Scan the bytecode and map each instruction's start offset to a number.
344 char* code_data = generate_code_data(m, code_length, CHECK_VERIFY(this));
346 int ex_min = code_length;
347 int ex_max = -1;
348 // Look through each item on the exception table. Each of the fields must refer
349 // to a legal instruction.
350 verify_exception_handler_table(
351 code_length, code_data, ex_min, ex_max, CHECK_VERIFY(this));
353 // Look through each entry on the local variable table and make sure
354 // its range of code array offsets is valid. (4169817)
355 if (m->has_localvariable_table()) {
356 verify_local_variable_table(code_length, code_data, CHECK_VERIFY(this));
357 }
359 typeArrayHandle stackmap_data(THREAD, m->stackmap_data());
360 StackMapStream stream(stackmap_data);
361 StackMapReader reader(this, &stream, code_data, code_length, THREAD);
362 StackMapTable stackmap_table(&reader, ¤t_frame, max_locals, max_stack,
363 code_data, code_length, CHECK_VERIFY(this));
365 if (_verify_verbose) {
366 stackmap_table.print();
367 }
369 RawBytecodeStream bcs(m);
371 // Scan the byte code linearly from the start to the end
372 bool no_control_flow = false; // Set to true when there is no direct control
373 // flow from current instruction to the next
374 // instruction in sequence
375 Bytecodes::Code opcode;
376 while (!bcs.is_last_bytecode()) {
377 // Check for recursive re-verification before each bytecode.
378 if (was_recursively_verified()) return;
380 opcode = bcs.raw_next();
381 u2 bci = bcs.bci();
383 // Set current frame's offset to bci
384 current_frame.set_offset(bci);
386 // Make sure every offset in stackmap table point to the beginning to
387 // an instruction. Match current_frame to stackmap_table entry with
388 // the same offset if exists.
389 stackmap_index = verify_stackmap_table(
390 stackmap_index, bci, ¤t_frame, &stackmap_table,
391 no_control_flow, CHECK_VERIFY(this));
393 bool this_uninit = false; // Set to true when invokespecial <init> initialized 'this'
395 // Merge with the next instruction
396 {
397 u2 index;
398 int target;
399 VerificationType type, type2;
400 VerificationType atype;
402 #ifndef PRODUCT
403 if (_verify_verbose) {
404 current_frame.print();
405 tty->print_cr("offset = %d, opcode = %s", bci, Bytecodes::name(opcode));
406 }
407 #endif
409 // Make sure wide instruction is in correct format
410 if (bcs.is_wide()) {
411 if (opcode != Bytecodes::_iinc && opcode != Bytecodes::_iload &&
412 opcode != Bytecodes::_aload && opcode != Bytecodes::_lload &&
413 opcode != Bytecodes::_istore && opcode != Bytecodes::_astore &&
414 opcode != Bytecodes::_lstore && opcode != Bytecodes::_fload &&
415 opcode != Bytecodes::_dload && opcode != Bytecodes::_fstore &&
416 opcode != Bytecodes::_dstore) {
417 verify_error(bci, "Bad wide instruction");
418 return;
419 }
420 }
422 switch (opcode) {
423 case Bytecodes::_nop :
424 no_control_flow = false; break;
425 case Bytecodes::_aconst_null :
426 current_frame.push_stack(
427 VerificationType::null_type(), CHECK_VERIFY(this));
428 no_control_flow = false; break;
429 case Bytecodes::_iconst_m1 :
430 case Bytecodes::_iconst_0 :
431 case Bytecodes::_iconst_1 :
432 case Bytecodes::_iconst_2 :
433 case Bytecodes::_iconst_3 :
434 case Bytecodes::_iconst_4 :
435 case Bytecodes::_iconst_5 :
436 current_frame.push_stack(
437 VerificationType::integer_type(), CHECK_VERIFY(this));
438 no_control_flow = false; break;
439 case Bytecodes::_lconst_0 :
440 case Bytecodes::_lconst_1 :
441 current_frame.push_stack_2(
442 VerificationType::long_type(),
443 VerificationType::long2_type(), CHECK_VERIFY(this));
444 no_control_flow = false; break;
445 case Bytecodes::_fconst_0 :
446 case Bytecodes::_fconst_1 :
447 case Bytecodes::_fconst_2 :
448 current_frame.push_stack(
449 VerificationType::float_type(), CHECK_VERIFY(this));
450 no_control_flow = false; break;
451 case Bytecodes::_dconst_0 :
452 case Bytecodes::_dconst_1 :
453 current_frame.push_stack_2(
454 VerificationType::double_type(),
455 VerificationType::double2_type(), CHECK_VERIFY(this));
456 no_control_flow = false; break;
457 case Bytecodes::_sipush :
458 case Bytecodes::_bipush :
459 current_frame.push_stack(
460 VerificationType::integer_type(), CHECK_VERIFY(this));
461 no_control_flow = false; break;
462 case Bytecodes::_ldc :
463 verify_ldc(
464 opcode, bcs.get_index_u1(), ¤t_frame,
465 cp, bci, CHECK_VERIFY(this));
466 no_control_flow = false; break;
467 case Bytecodes::_ldc_w :
468 case Bytecodes::_ldc2_w :
469 verify_ldc(
470 opcode, bcs.get_index_u2(), ¤t_frame,
471 cp, bci, CHECK_VERIFY(this));
472 no_control_flow = false; break;
473 case Bytecodes::_iload :
474 verify_iload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
475 no_control_flow = false; break;
476 case Bytecodes::_iload_0 :
477 case Bytecodes::_iload_1 :
478 case Bytecodes::_iload_2 :
479 case Bytecodes::_iload_3 :
480 index = opcode - Bytecodes::_iload_0;
481 verify_iload(index, ¤t_frame, CHECK_VERIFY(this));
482 no_control_flow = false; break;
483 case Bytecodes::_lload :
484 verify_lload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
485 no_control_flow = false; break;
486 case Bytecodes::_lload_0 :
487 case Bytecodes::_lload_1 :
488 case Bytecodes::_lload_2 :
489 case Bytecodes::_lload_3 :
490 index = opcode - Bytecodes::_lload_0;
491 verify_lload(index, ¤t_frame, CHECK_VERIFY(this));
492 no_control_flow = false; break;
493 case Bytecodes::_fload :
494 verify_fload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
495 no_control_flow = false; break;
496 case Bytecodes::_fload_0 :
497 case Bytecodes::_fload_1 :
498 case Bytecodes::_fload_2 :
499 case Bytecodes::_fload_3 :
500 index = opcode - Bytecodes::_fload_0;
501 verify_fload(index, ¤t_frame, CHECK_VERIFY(this));
502 no_control_flow = false; break;
503 case Bytecodes::_dload :
504 verify_dload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
505 no_control_flow = false; break;
506 case Bytecodes::_dload_0 :
507 case Bytecodes::_dload_1 :
508 case Bytecodes::_dload_2 :
509 case Bytecodes::_dload_3 :
510 index = opcode - Bytecodes::_dload_0;
511 verify_dload(index, ¤t_frame, CHECK_VERIFY(this));
512 no_control_flow = false; break;
513 case Bytecodes::_aload :
514 verify_aload(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
515 no_control_flow = false; break;
516 case Bytecodes::_aload_0 :
517 case Bytecodes::_aload_1 :
518 case Bytecodes::_aload_2 :
519 case Bytecodes::_aload_3 :
520 index = opcode - Bytecodes::_aload_0;
521 verify_aload(index, ¤t_frame, CHECK_VERIFY(this));
522 no_control_flow = false; break;
523 case Bytecodes::_iaload :
524 type = current_frame.pop_stack(
525 VerificationType::integer_type(), CHECK_VERIFY(this));
526 atype = current_frame.pop_stack(
527 VerificationType::reference_check(), CHECK_VERIFY(this));
528 if (!atype.is_int_array()) {
529 verify_error(bci, bad_type_msg, "iaload");
530 return;
531 }
532 current_frame.push_stack(
533 VerificationType::integer_type(), CHECK_VERIFY(this));
534 no_control_flow = false; break;
535 case Bytecodes::_baload :
536 type = current_frame.pop_stack(
537 VerificationType::integer_type(), CHECK_VERIFY(this));
538 atype = current_frame.pop_stack(
539 VerificationType::reference_check(), CHECK_VERIFY(this));
540 if (!atype.is_bool_array() && !atype.is_byte_array()) {
541 verify_error(bci, bad_type_msg, "baload");
542 return;
543 }
544 current_frame.push_stack(
545 VerificationType::integer_type(), CHECK_VERIFY(this));
546 no_control_flow = false; break;
547 case Bytecodes::_caload :
548 type = current_frame.pop_stack(
549 VerificationType::integer_type(), CHECK_VERIFY(this));
550 atype = current_frame.pop_stack(
551 VerificationType::reference_check(), CHECK_VERIFY(this));
552 if (!atype.is_char_array()) {
553 verify_error(bci, bad_type_msg, "caload");
554 return;
555 }
556 current_frame.push_stack(
557 VerificationType::integer_type(), CHECK_VERIFY(this));
558 no_control_flow = false; break;
559 case Bytecodes::_saload :
560 type = current_frame.pop_stack(
561 VerificationType::integer_type(), CHECK_VERIFY(this));
562 atype = current_frame.pop_stack(
563 VerificationType::reference_check(), CHECK_VERIFY(this));
564 if (!atype.is_short_array()) {
565 verify_error(bci, bad_type_msg, "saload");
566 return;
567 }
568 current_frame.push_stack(
569 VerificationType::integer_type(), CHECK_VERIFY(this));
570 no_control_flow = false; break;
571 case Bytecodes::_laload :
572 type = current_frame.pop_stack(
573 VerificationType::integer_type(), CHECK_VERIFY(this));
574 atype = current_frame.pop_stack(
575 VerificationType::reference_check(), CHECK_VERIFY(this));
576 if (!atype.is_long_array()) {
577 verify_error(bci, bad_type_msg, "laload");
578 return;
579 }
580 current_frame.push_stack_2(
581 VerificationType::long_type(),
582 VerificationType::long2_type(), CHECK_VERIFY(this));
583 no_control_flow = false; break;
584 case Bytecodes::_faload :
585 type = current_frame.pop_stack(
586 VerificationType::integer_type(), CHECK_VERIFY(this));
587 atype = current_frame.pop_stack(
588 VerificationType::reference_check(), CHECK_VERIFY(this));
589 if (!atype.is_float_array()) {
590 verify_error(bci, bad_type_msg, "faload");
591 return;
592 }
593 current_frame.push_stack(
594 VerificationType::float_type(), CHECK_VERIFY(this));
595 no_control_flow = false; break;
596 case Bytecodes::_daload :
597 type = current_frame.pop_stack(
598 VerificationType::integer_type(), CHECK_VERIFY(this));
599 atype = current_frame.pop_stack(
600 VerificationType::reference_check(), CHECK_VERIFY(this));
601 if (!atype.is_double_array()) {
602 verify_error(bci, bad_type_msg, "daload");
603 return;
604 }
605 current_frame.push_stack_2(
606 VerificationType::double_type(),
607 VerificationType::double2_type(), CHECK_VERIFY(this));
608 no_control_flow = false; break;
609 case Bytecodes::_aaload : {
610 type = current_frame.pop_stack(
611 VerificationType::integer_type(), CHECK_VERIFY(this));
612 atype = current_frame.pop_stack(
613 VerificationType::reference_check(), CHECK_VERIFY(this));
614 if (!atype.is_reference_array()) {
615 verify_error(bci, bad_type_msg, "aaload");
616 return;
617 }
618 if (atype.is_null()) {
619 current_frame.push_stack(
620 VerificationType::null_type(), CHECK_VERIFY(this));
621 } else {
622 VerificationType component =
623 atype.get_component(this, CHECK_VERIFY(this));
624 current_frame.push_stack(component, CHECK_VERIFY(this));
625 }
626 no_control_flow = false; break;
627 }
628 case Bytecodes::_istore :
629 verify_istore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
630 no_control_flow = false; break;
631 case Bytecodes::_istore_0 :
632 case Bytecodes::_istore_1 :
633 case Bytecodes::_istore_2 :
634 case Bytecodes::_istore_3 :
635 index = opcode - Bytecodes::_istore_0;
636 verify_istore(index, ¤t_frame, CHECK_VERIFY(this));
637 no_control_flow = false; break;
638 case Bytecodes::_lstore :
639 verify_lstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
640 no_control_flow = false; break;
641 case Bytecodes::_lstore_0 :
642 case Bytecodes::_lstore_1 :
643 case Bytecodes::_lstore_2 :
644 case Bytecodes::_lstore_3 :
645 index = opcode - Bytecodes::_lstore_0;
646 verify_lstore(index, ¤t_frame, CHECK_VERIFY(this));
647 no_control_flow = false; break;
648 case Bytecodes::_fstore :
649 verify_fstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
650 no_control_flow = false; break;
651 case Bytecodes::_fstore_0 :
652 case Bytecodes::_fstore_1 :
653 case Bytecodes::_fstore_2 :
654 case Bytecodes::_fstore_3 :
655 index = opcode - Bytecodes::_fstore_0;
656 verify_fstore(index, ¤t_frame, CHECK_VERIFY(this));
657 no_control_flow = false; break;
658 case Bytecodes::_dstore :
659 verify_dstore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
660 no_control_flow = false; break;
661 case Bytecodes::_dstore_0 :
662 case Bytecodes::_dstore_1 :
663 case Bytecodes::_dstore_2 :
664 case Bytecodes::_dstore_3 :
665 index = opcode - Bytecodes::_dstore_0;
666 verify_dstore(index, ¤t_frame, CHECK_VERIFY(this));
667 no_control_flow = false; break;
668 case Bytecodes::_astore :
669 verify_astore(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
670 no_control_flow = false; break;
671 case Bytecodes::_astore_0 :
672 case Bytecodes::_astore_1 :
673 case Bytecodes::_astore_2 :
674 case Bytecodes::_astore_3 :
675 index = opcode - Bytecodes::_astore_0;
676 verify_astore(index, ¤t_frame, CHECK_VERIFY(this));
677 no_control_flow = false; break;
678 case Bytecodes::_iastore :
679 type = current_frame.pop_stack(
680 VerificationType::integer_type(), CHECK_VERIFY(this));
681 type2 = current_frame.pop_stack(
682 VerificationType::integer_type(), CHECK_VERIFY(this));
683 atype = current_frame.pop_stack(
684 VerificationType::reference_check(), CHECK_VERIFY(this));
685 if (!atype.is_int_array()) {
686 verify_error(bci, bad_type_msg, "iastore");
687 return;
688 }
689 no_control_flow = false; break;
690 case Bytecodes::_bastore :
691 type = current_frame.pop_stack(
692 VerificationType::integer_type(), CHECK_VERIFY(this));
693 type2 = current_frame.pop_stack(
694 VerificationType::integer_type(), CHECK_VERIFY(this));
695 atype = current_frame.pop_stack(
696 VerificationType::reference_check(), CHECK_VERIFY(this));
697 if (!atype.is_bool_array() && !atype.is_byte_array()) {
698 verify_error(bci, bad_type_msg, "bastore");
699 return;
700 }
701 no_control_flow = false; break;
702 case Bytecodes::_castore :
703 current_frame.pop_stack(
704 VerificationType::integer_type(), CHECK_VERIFY(this));
705 current_frame.pop_stack(
706 VerificationType::integer_type(), CHECK_VERIFY(this));
707 atype = current_frame.pop_stack(
708 VerificationType::reference_check(), CHECK_VERIFY(this));
709 if (!atype.is_char_array()) {
710 verify_error(bci, bad_type_msg, "castore");
711 return;
712 }
713 no_control_flow = false; break;
714 case Bytecodes::_sastore :
715 current_frame.pop_stack(
716 VerificationType::integer_type(), CHECK_VERIFY(this));
717 current_frame.pop_stack(
718 VerificationType::integer_type(), CHECK_VERIFY(this));
719 atype = current_frame.pop_stack(
720 VerificationType::reference_check(), CHECK_VERIFY(this));
721 if (!atype.is_short_array()) {
722 verify_error(bci, bad_type_msg, "sastore");
723 return;
724 }
725 no_control_flow = false; break;
726 case Bytecodes::_lastore :
727 current_frame.pop_stack_2(
728 VerificationType::long2_type(),
729 VerificationType::long_type(), CHECK_VERIFY(this));
730 current_frame.pop_stack(
731 VerificationType::integer_type(), CHECK_VERIFY(this));
732 atype = current_frame.pop_stack(
733 VerificationType::reference_check(), CHECK_VERIFY(this));
734 if (!atype.is_long_array()) {
735 verify_error(bci, bad_type_msg, "lastore");
736 return;
737 }
738 no_control_flow = false; break;
739 case Bytecodes::_fastore :
740 current_frame.pop_stack(
741 VerificationType::float_type(), CHECK_VERIFY(this));
742 current_frame.pop_stack
743 (VerificationType::integer_type(), CHECK_VERIFY(this));
744 atype = current_frame.pop_stack(
745 VerificationType::reference_check(), CHECK_VERIFY(this));
746 if (!atype.is_float_array()) {
747 verify_error(bci, bad_type_msg, "fastore");
748 return;
749 }
750 no_control_flow = false; break;
751 case Bytecodes::_dastore :
752 current_frame.pop_stack_2(
753 VerificationType::double2_type(),
754 VerificationType::double_type(), CHECK_VERIFY(this));
755 current_frame.pop_stack(
756 VerificationType::integer_type(), CHECK_VERIFY(this));
757 atype = current_frame.pop_stack(
758 VerificationType::reference_check(), CHECK_VERIFY(this));
759 if (!atype.is_double_array()) {
760 verify_error(bci, bad_type_msg, "dastore");
761 return;
762 }
763 no_control_flow = false; break;
764 case Bytecodes::_aastore :
765 type = current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
766 type2 = current_frame.pop_stack(
767 VerificationType::integer_type(), CHECK_VERIFY(this));
768 atype = current_frame.pop_stack(
769 VerificationType::reference_check(), CHECK_VERIFY(this));
770 // more type-checking is done at runtime
771 if (!atype.is_reference_array()) {
772 verify_error(bci, bad_type_msg, "aastore");
773 return;
774 }
775 // 4938384: relaxed constraint in JVMS 3nd edition.
776 no_control_flow = false; break;
777 case Bytecodes::_pop :
778 current_frame.pop_stack(
779 VerificationType::category1_check(), CHECK_VERIFY(this));
780 no_control_flow = false; break;
781 case Bytecodes::_pop2 :
782 type = current_frame.pop_stack(CHECK_VERIFY(this));
783 if (type.is_category1()) {
784 current_frame.pop_stack(
785 VerificationType::category1_check(), CHECK_VERIFY(this));
786 } else if (type.is_category2_2nd()) {
787 current_frame.pop_stack(
788 VerificationType::category2_check(), CHECK_VERIFY(this));
789 } else {
790 verify_error(bci, bad_type_msg, "pop2");
791 return;
792 }
793 no_control_flow = false; break;
794 case Bytecodes::_dup :
795 type = current_frame.pop_stack(
796 VerificationType::category1_check(), CHECK_VERIFY(this));
797 current_frame.push_stack(type, CHECK_VERIFY(this));
798 current_frame.push_stack(type, CHECK_VERIFY(this));
799 no_control_flow = false; break;
800 case Bytecodes::_dup_x1 :
801 type = current_frame.pop_stack(
802 VerificationType::category1_check(), CHECK_VERIFY(this));
803 type2 = current_frame.pop_stack(
804 VerificationType::category1_check(), CHECK_VERIFY(this));
805 current_frame.push_stack(type, CHECK_VERIFY(this));
806 current_frame.push_stack(type2, CHECK_VERIFY(this));
807 current_frame.push_stack(type, CHECK_VERIFY(this));
808 no_control_flow = false; break;
809 case Bytecodes::_dup_x2 :
810 {
811 VerificationType type3;
812 type = current_frame.pop_stack(
813 VerificationType::category1_check(), CHECK_VERIFY(this));
814 type2 = current_frame.pop_stack(CHECK_VERIFY(this));
815 if (type2.is_category1()) {
816 type3 = current_frame.pop_stack(
817 VerificationType::category1_check(), CHECK_VERIFY(this));
818 } else if (type2.is_category2_2nd()) {
819 type3 = current_frame.pop_stack(
820 VerificationType::category2_check(), CHECK_VERIFY(this));
821 } else {
822 verify_error(bci, bad_type_msg, "dup_x2");
823 return;
824 }
825 current_frame.push_stack(type, CHECK_VERIFY(this));
826 current_frame.push_stack(type3, CHECK_VERIFY(this));
827 current_frame.push_stack(type2, CHECK_VERIFY(this));
828 current_frame.push_stack(type, CHECK_VERIFY(this));
829 no_control_flow = false; break;
830 }
831 case Bytecodes::_dup2 :
832 type = current_frame.pop_stack(CHECK_VERIFY(this));
833 if (type.is_category1()) {
834 type2 = current_frame.pop_stack(
835 VerificationType::category1_check(), CHECK_VERIFY(this));
836 } else if (type.is_category2_2nd()) {
837 type2 = current_frame.pop_stack(
838 VerificationType::category2_check(), CHECK_VERIFY(this));
839 } else {
840 verify_error(bci, bad_type_msg, "dup2");
841 return;
842 }
843 current_frame.push_stack(type2, CHECK_VERIFY(this));
844 current_frame.push_stack(type, CHECK_VERIFY(this));
845 current_frame.push_stack(type2, CHECK_VERIFY(this));
846 current_frame.push_stack(type, CHECK_VERIFY(this));
847 no_control_flow = false; break;
848 case Bytecodes::_dup2_x1 :
849 {
850 VerificationType type3;
851 type = current_frame.pop_stack(CHECK_VERIFY(this));
852 if (type.is_category1()) {
853 type2 = current_frame.pop_stack(
854 VerificationType::category1_check(), CHECK_VERIFY(this));
855 } else if(type.is_category2_2nd()) {
856 type2 = current_frame.pop_stack
857 (VerificationType::category2_check(), CHECK_VERIFY(this));
858 } else {
859 verify_error(bci, bad_type_msg, "dup2_x1");
860 return;
861 }
862 type3 = current_frame.pop_stack(
863 VerificationType::category1_check(), CHECK_VERIFY(this));
864 current_frame.push_stack(type2, CHECK_VERIFY(this));
865 current_frame.push_stack(type, CHECK_VERIFY(this));
866 current_frame.push_stack(type3, CHECK_VERIFY(this));
867 current_frame.push_stack(type2, CHECK_VERIFY(this));
868 current_frame.push_stack(type, CHECK_VERIFY(this));
869 no_control_flow = false; break;
870 }
871 case Bytecodes::_dup2_x2 :
872 {
873 VerificationType type3, type4;
874 type = current_frame.pop_stack(CHECK_VERIFY(this));
875 if (type.is_category1()) {
876 type2 = current_frame.pop_stack(
877 VerificationType::category1_check(), CHECK_VERIFY(this));
878 } else if (type.is_category2_2nd()) {
879 type2 = current_frame.pop_stack(
880 VerificationType::category2_check(), CHECK_VERIFY(this));
881 } else {
882 verify_error(bci, bad_type_msg, "dup2_x2");
883 return;
884 }
885 type3 = current_frame.pop_stack(CHECK_VERIFY(this));
886 if (type3.is_category1()) {
887 type4 = current_frame.pop_stack(
888 VerificationType::category1_check(), CHECK_VERIFY(this));
889 } else if (type3.is_category2_2nd()) {
890 type4 = current_frame.pop_stack(
891 VerificationType::category2_check(), CHECK_VERIFY(this));
892 } else {
893 verify_error(bci, bad_type_msg, "dup2_x2");
894 return;
895 }
896 current_frame.push_stack(type2, CHECK_VERIFY(this));
897 current_frame.push_stack(type, CHECK_VERIFY(this));
898 current_frame.push_stack(type4, CHECK_VERIFY(this));
899 current_frame.push_stack(type3, CHECK_VERIFY(this));
900 current_frame.push_stack(type2, CHECK_VERIFY(this));
901 current_frame.push_stack(type, CHECK_VERIFY(this));
902 no_control_flow = false; break;
903 }
904 case Bytecodes::_swap :
905 type = current_frame.pop_stack(
906 VerificationType::category1_check(), CHECK_VERIFY(this));
907 type2 = current_frame.pop_stack(
908 VerificationType::category1_check(), CHECK_VERIFY(this));
909 current_frame.push_stack(type, CHECK_VERIFY(this));
910 current_frame.push_stack(type2, CHECK_VERIFY(this));
911 no_control_flow = false; break;
912 case Bytecodes::_iadd :
913 case Bytecodes::_isub :
914 case Bytecodes::_imul :
915 case Bytecodes::_idiv :
916 case Bytecodes::_irem :
917 case Bytecodes::_ishl :
918 case Bytecodes::_ishr :
919 case Bytecodes::_iushr :
920 case Bytecodes::_ior :
921 case Bytecodes::_ixor :
922 case Bytecodes::_iand :
923 current_frame.pop_stack(
924 VerificationType::integer_type(), CHECK_VERIFY(this));
925 // fall through
926 case Bytecodes::_ineg :
927 current_frame.pop_stack(
928 VerificationType::integer_type(), CHECK_VERIFY(this));
929 current_frame.push_stack(
930 VerificationType::integer_type(), CHECK_VERIFY(this));
931 no_control_flow = false; break;
932 case Bytecodes::_ladd :
933 case Bytecodes::_lsub :
934 case Bytecodes::_lmul :
935 case Bytecodes::_ldiv :
936 case Bytecodes::_lrem :
937 case Bytecodes::_land :
938 case Bytecodes::_lor :
939 case Bytecodes::_lxor :
940 current_frame.pop_stack_2(
941 VerificationType::long2_type(),
942 VerificationType::long_type(), CHECK_VERIFY(this));
943 // fall through
944 case Bytecodes::_lneg :
945 current_frame.pop_stack_2(
946 VerificationType::long2_type(),
947 VerificationType::long_type(), CHECK_VERIFY(this));
948 current_frame.push_stack_2(
949 VerificationType::long_type(),
950 VerificationType::long2_type(), CHECK_VERIFY(this));
951 no_control_flow = false; break;
952 case Bytecodes::_lshl :
953 case Bytecodes::_lshr :
954 case Bytecodes::_lushr :
955 current_frame.pop_stack(
956 VerificationType::integer_type(), CHECK_VERIFY(this));
957 current_frame.pop_stack_2(
958 VerificationType::long2_type(),
959 VerificationType::long_type(), CHECK_VERIFY(this));
960 current_frame.push_stack_2(
961 VerificationType::long_type(),
962 VerificationType::long2_type(), CHECK_VERIFY(this));
963 no_control_flow = false; break;
964 case Bytecodes::_fadd :
965 case Bytecodes::_fsub :
966 case Bytecodes::_fmul :
967 case Bytecodes::_fdiv :
968 case Bytecodes::_frem :
969 current_frame.pop_stack(
970 VerificationType::float_type(), CHECK_VERIFY(this));
971 // fall through
972 case Bytecodes::_fneg :
973 current_frame.pop_stack(
974 VerificationType::float_type(), CHECK_VERIFY(this));
975 current_frame.push_stack(
976 VerificationType::float_type(), CHECK_VERIFY(this));
977 no_control_flow = false; break;
978 case Bytecodes::_dadd :
979 case Bytecodes::_dsub :
980 case Bytecodes::_dmul :
981 case Bytecodes::_ddiv :
982 case Bytecodes::_drem :
983 current_frame.pop_stack_2(
984 VerificationType::double2_type(),
985 VerificationType::double_type(), CHECK_VERIFY(this));
986 // fall through
987 case Bytecodes::_dneg :
988 current_frame.pop_stack_2(
989 VerificationType::double2_type(),
990 VerificationType::double_type(), CHECK_VERIFY(this));
991 current_frame.push_stack_2(
992 VerificationType::double_type(),
993 VerificationType::double2_type(), CHECK_VERIFY(this));
994 no_control_flow = false; break;
995 case Bytecodes::_iinc :
996 verify_iinc(bcs.get_index(), ¤t_frame, CHECK_VERIFY(this));
997 no_control_flow = false; break;
998 case Bytecodes::_i2l :
999 type = current_frame.pop_stack(
1000 VerificationType::integer_type(), CHECK_VERIFY(this));
1001 current_frame.push_stack_2(
1002 VerificationType::long_type(),
1003 VerificationType::long2_type(), CHECK_VERIFY(this));
1004 no_control_flow = false; break;
1005 case Bytecodes::_l2i :
1006 current_frame.pop_stack_2(
1007 VerificationType::long2_type(),
1008 VerificationType::long_type(), CHECK_VERIFY(this));
1009 current_frame.push_stack(
1010 VerificationType::integer_type(), CHECK_VERIFY(this));
1011 no_control_flow = false; break;
1012 case Bytecodes::_i2f :
1013 current_frame.pop_stack(
1014 VerificationType::integer_type(), CHECK_VERIFY(this));
1015 current_frame.push_stack(
1016 VerificationType::float_type(), CHECK_VERIFY(this));
1017 no_control_flow = false; break;
1018 case Bytecodes::_i2d :
1019 current_frame.pop_stack(
1020 VerificationType::integer_type(), CHECK_VERIFY(this));
1021 current_frame.push_stack_2(
1022 VerificationType::double_type(),
1023 VerificationType::double2_type(), CHECK_VERIFY(this));
1024 no_control_flow = false; break;
1025 case Bytecodes::_l2f :
1026 current_frame.pop_stack_2(
1027 VerificationType::long2_type(),
1028 VerificationType::long_type(), CHECK_VERIFY(this));
1029 current_frame.push_stack(
1030 VerificationType::float_type(), CHECK_VERIFY(this));
1031 no_control_flow = false; break;
1032 case Bytecodes::_l2d :
1033 current_frame.pop_stack_2(
1034 VerificationType::long2_type(),
1035 VerificationType::long_type(), CHECK_VERIFY(this));
1036 current_frame.push_stack_2(
1037 VerificationType::double_type(),
1038 VerificationType::double2_type(), CHECK_VERIFY(this));
1039 no_control_flow = false; break;
1040 case Bytecodes::_f2i :
1041 current_frame.pop_stack(
1042 VerificationType::float_type(), CHECK_VERIFY(this));
1043 current_frame.push_stack(
1044 VerificationType::integer_type(), CHECK_VERIFY(this));
1045 no_control_flow = false; break;
1046 case Bytecodes::_f2l :
1047 current_frame.pop_stack(
1048 VerificationType::float_type(), CHECK_VERIFY(this));
1049 current_frame.push_stack_2(
1050 VerificationType::long_type(),
1051 VerificationType::long2_type(), CHECK_VERIFY(this));
1052 no_control_flow = false; break;
1053 case Bytecodes::_f2d :
1054 current_frame.pop_stack(
1055 VerificationType::float_type(), CHECK_VERIFY(this));
1056 current_frame.push_stack_2(
1057 VerificationType::double_type(),
1058 VerificationType::double2_type(), CHECK_VERIFY(this));
1059 no_control_flow = false; break;
1060 case Bytecodes::_d2i :
1061 current_frame.pop_stack_2(
1062 VerificationType::double2_type(),
1063 VerificationType::double_type(), CHECK_VERIFY(this));
1064 current_frame.push_stack(
1065 VerificationType::integer_type(), CHECK_VERIFY(this));
1066 no_control_flow = false; break;
1067 case Bytecodes::_d2l :
1068 current_frame.pop_stack_2(
1069 VerificationType::double2_type(),
1070 VerificationType::double_type(), CHECK_VERIFY(this));
1071 current_frame.push_stack_2(
1072 VerificationType::long_type(),
1073 VerificationType::long2_type(), CHECK_VERIFY(this));
1074 no_control_flow = false; break;
1075 case Bytecodes::_d2f :
1076 current_frame.pop_stack_2(
1077 VerificationType::double2_type(),
1078 VerificationType::double_type(), CHECK_VERIFY(this));
1079 current_frame.push_stack(
1080 VerificationType::float_type(), CHECK_VERIFY(this));
1081 no_control_flow = false; break;
1082 case Bytecodes::_i2b :
1083 case Bytecodes::_i2c :
1084 case Bytecodes::_i2s :
1085 current_frame.pop_stack(
1086 VerificationType::integer_type(), CHECK_VERIFY(this));
1087 current_frame.push_stack(
1088 VerificationType::integer_type(), CHECK_VERIFY(this));
1089 no_control_flow = false; break;
1090 case Bytecodes::_lcmp :
1091 current_frame.pop_stack_2(
1092 VerificationType::long2_type(),
1093 VerificationType::long_type(), CHECK_VERIFY(this));
1094 current_frame.pop_stack_2(
1095 VerificationType::long2_type(),
1096 VerificationType::long_type(), CHECK_VERIFY(this));
1097 current_frame.push_stack(
1098 VerificationType::integer_type(), CHECK_VERIFY(this));
1099 no_control_flow = false; break;
1100 case Bytecodes::_fcmpl :
1101 case Bytecodes::_fcmpg :
1102 current_frame.pop_stack(
1103 VerificationType::float_type(), CHECK_VERIFY(this));
1104 current_frame.pop_stack(
1105 VerificationType::float_type(), CHECK_VERIFY(this));
1106 current_frame.push_stack(
1107 VerificationType::integer_type(), CHECK_VERIFY(this));
1108 no_control_flow = false; break;
1109 case Bytecodes::_dcmpl :
1110 case Bytecodes::_dcmpg :
1111 current_frame.pop_stack_2(
1112 VerificationType::double2_type(),
1113 VerificationType::double_type(), CHECK_VERIFY(this));
1114 current_frame.pop_stack_2(
1115 VerificationType::double2_type(),
1116 VerificationType::double_type(), CHECK_VERIFY(this));
1117 current_frame.push_stack(
1118 VerificationType::integer_type(), CHECK_VERIFY(this));
1119 no_control_flow = false; break;
1120 case Bytecodes::_if_icmpeq:
1121 case Bytecodes::_if_icmpne:
1122 case Bytecodes::_if_icmplt:
1123 case Bytecodes::_if_icmpge:
1124 case Bytecodes::_if_icmpgt:
1125 case Bytecodes::_if_icmple:
1126 current_frame.pop_stack(
1127 VerificationType::integer_type(), CHECK_VERIFY(this));
1128 // fall through
1129 case Bytecodes::_ifeq:
1130 case Bytecodes::_ifne:
1131 case Bytecodes::_iflt:
1132 case Bytecodes::_ifge:
1133 case Bytecodes::_ifgt:
1134 case Bytecodes::_ifle:
1135 current_frame.pop_stack(
1136 VerificationType::integer_type(), CHECK_VERIFY(this));
1137 target = bcs.dest();
1138 stackmap_table.check_jump_target(
1139 ¤t_frame, target, CHECK_VERIFY(this));
1140 no_control_flow = false; break;
1141 case Bytecodes::_if_acmpeq :
1142 case Bytecodes::_if_acmpne :
1143 current_frame.pop_stack(
1144 VerificationType::reference_check(), CHECK_VERIFY(this));
1145 // fall through
1146 case Bytecodes::_ifnull :
1147 case Bytecodes::_ifnonnull :
1148 current_frame.pop_stack(
1149 VerificationType::reference_check(), CHECK_VERIFY(this));
1150 target = bcs.dest();
1151 stackmap_table.check_jump_target
1152 (¤t_frame, target, CHECK_VERIFY(this));
1153 no_control_flow = false; break;
1154 case Bytecodes::_goto :
1155 target = bcs.dest();
1156 stackmap_table.check_jump_target(
1157 ¤t_frame, target, CHECK_VERIFY(this));
1158 no_control_flow = true; break;
1159 case Bytecodes::_goto_w :
1160 target = bcs.dest_w();
1161 stackmap_table.check_jump_target(
1162 ¤t_frame, target, CHECK_VERIFY(this));
1163 no_control_flow = true; break;
1164 case Bytecodes::_tableswitch :
1165 case Bytecodes::_lookupswitch :
1166 verify_switch(
1167 &bcs, code_length, code_data, ¤t_frame,
1168 &stackmap_table, CHECK_VERIFY(this));
1169 no_control_flow = true; break;
1170 case Bytecodes::_ireturn :
1171 type = current_frame.pop_stack(
1172 VerificationType::integer_type(), CHECK_VERIFY(this));
1173 verify_return_value(return_type, type, bci, CHECK_VERIFY(this));
1174 no_control_flow = true; break;
1175 case Bytecodes::_lreturn :
1176 type2 = current_frame.pop_stack(
1177 VerificationType::long2_type(), CHECK_VERIFY(this));
1178 type = current_frame.pop_stack(
1179 VerificationType::long_type(), CHECK_VERIFY(this));
1180 verify_return_value(return_type, type, bci, CHECK_VERIFY(this));
1181 no_control_flow = true; break;
1182 case Bytecodes::_freturn :
1183 type = current_frame.pop_stack(
1184 VerificationType::float_type(), CHECK_VERIFY(this));
1185 verify_return_value(return_type, type, bci, CHECK_VERIFY(this));
1186 no_control_flow = true; break;
1187 case Bytecodes::_dreturn :
1188 type2 = current_frame.pop_stack(
1189 VerificationType::double2_type(), CHECK_VERIFY(this));
1190 type = current_frame.pop_stack(
1191 VerificationType::double_type(), CHECK_VERIFY(this));
1192 verify_return_value(return_type, type, bci, CHECK_VERIFY(this));
1193 no_control_flow = true; break;
1194 case Bytecodes::_areturn :
1195 type = current_frame.pop_stack(
1196 VerificationType::reference_check(), CHECK_VERIFY(this));
1197 verify_return_value(return_type, type, bci, CHECK_VERIFY(this));
1198 no_control_flow = true; break;
1199 case Bytecodes::_return :
1200 if (return_type != VerificationType::bogus_type()) {
1201 verify_error(bci, "Method expects no return value");
1202 return;
1203 }
1204 // Make sure "this" has been initialized if current method is an
1205 // <init>
1206 if (_method->name() == vmSymbols::object_initializer_name() &&
1207 current_frame.flag_this_uninit()) {
1208 verify_error(bci,
1209 "Constructor must call super() or this() before return");
1210 return;
1211 }
1212 no_control_flow = true; break;
1213 case Bytecodes::_getstatic :
1214 case Bytecodes::_putstatic :
1215 case Bytecodes::_getfield :
1216 case Bytecodes::_putfield :
1217 verify_field_instructions(
1218 &bcs, ¤t_frame, cp, CHECK_VERIFY(this));
1219 no_control_flow = false; break;
1220 case Bytecodes::_invokevirtual :
1221 case Bytecodes::_invokespecial :
1222 case Bytecodes::_invokestatic :
1223 verify_invoke_instructions(
1224 &bcs, code_length, ¤t_frame,
1225 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1226 no_control_flow = false; break;
1227 case Bytecodes::_invokeinterface :
1228 case Bytecodes::_invokedynamic :
1229 verify_invoke_instructions(
1230 &bcs, code_length, ¤t_frame,
1231 &this_uninit, return_type, cp, CHECK_VERIFY(this));
1232 no_control_flow = false; break;
1233 case Bytecodes::_new :
1234 {
1235 index = bcs.get_index_u2();
1236 verify_cp_class_type(index, cp, CHECK_VERIFY(this));
1237 VerificationType new_class_type =
1238 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1239 if (!new_class_type.is_object()) {
1240 verify_error(bci, "Illegal new instruction");
1241 return;
1242 }
1243 type = VerificationType::uninitialized_type(bci);
1244 current_frame.push_stack(type, CHECK_VERIFY(this));
1245 no_control_flow = false; break;
1246 }
1247 case Bytecodes::_newarray :
1248 type = get_newarray_type(bcs.get_index(), bci, CHECK_VERIFY(this));
1249 current_frame.pop_stack(
1250 VerificationType::integer_type(), CHECK_VERIFY(this));
1251 current_frame.push_stack(type, CHECK_VERIFY(this));
1252 no_control_flow = false; break;
1253 case Bytecodes::_anewarray :
1254 verify_anewarray(
1255 bcs.get_index_u2(), cp, ¤t_frame, CHECK_VERIFY(this));
1256 no_control_flow = false; break;
1257 case Bytecodes::_arraylength :
1258 type = current_frame.pop_stack(
1259 VerificationType::reference_check(), CHECK_VERIFY(this));
1260 if (!(type.is_null() || type.is_array())) {
1261 verify_error(bci, bad_type_msg, "arraylength");
1262 }
1263 current_frame.push_stack(
1264 VerificationType::integer_type(), CHECK_VERIFY(this));
1265 no_control_flow = false; break;
1266 case Bytecodes::_checkcast :
1267 {
1268 index = bcs.get_index_u2();
1269 verify_cp_class_type(index, cp, CHECK_VERIFY(this));
1270 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1271 VerificationType klass_type = cp_index_to_type(
1272 index, cp, CHECK_VERIFY(this));
1273 current_frame.push_stack(klass_type, CHECK_VERIFY(this));
1274 no_control_flow = false; break;
1275 }
1276 case Bytecodes::_instanceof : {
1277 index = bcs.get_index_u2();
1278 verify_cp_class_type(index, cp, CHECK_VERIFY(this));
1279 current_frame.pop_stack(object_type(), CHECK_VERIFY(this));
1280 current_frame.push_stack(
1281 VerificationType::integer_type(), CHECK_VERIFY(this));
1282 no_control_flow = false; break;
1283 }
1284 case Bytecodes::_monitorenter :
1285 case Bytecodes::_monitorexit :
1286 current_frame.pop_stack(
1287 VerificationType::reference_check(), CHECK_VERIFY(this));
1288 no_control_flow = false; break;
1289 case Bytecodes::_multianewarray :
1290 {
1291 index = bcs.get_index_u2();
1292 u2 dim = *(bcs.bcp()+3);
1293 verify_cp_class_type(index, cp, CHECK_VERIFY(this));
1294 VerificationType new_array_type =
1295 cp_index_to_type(index, cp, CHECK_VERIFY(this));
1296 if (!new_array_type.is_array()) {
1297 verify_error(bci,
1298 "Illegal constant pool index in multianewarray instruction");
1299 return;
1300 }
1301 if (dim < 1 || new_array_type.dimensions() < dim) {
1302 verify_error(bci,
1303 "Illegal dimension in multianewarray instruction");
1304 return;
1305 }
1306 for (int i = 0; i < dim; i++) {
1307 current_frame.pop_stack(
1308 VerificationType::integer_type(), CHECK_VERIFY(this));
1309 }
1310 current_frame.push_stack(new_array_type, CHECK_VERIFY(this));
1311 no_control_flow = false; break;
1312 }
1313 case Bytecodes::_athrow :
1314 type = VerificationType::reference_type(
1315 vmSymbols::java_lang_Throwable());
1316 current_frame.pop_stack(type, CHECK_VERIFY(this));
1317 no_control_flow = true; break;
1318 default:
1319 // We only need to check the valid bytecodes in class file.
1320 // And jsr and ret are not in the new class file format in JDK1.5.
1321 verify_error(bci, "Bad instruction");
1322 no_control_flow = false;
1323 return;
1324 } // end switch
1325 } // end Merge with the next instruction
1327 // Look for possible jump target in exception handlers and see if it
1328 // matches current_frame
1329 if (bci >= ex_min && bci < ex_max) {
1330 verify_exception_handler_targets(
1331 bci, this_uninit, ¤t_frame, &stackmap_table, CHECK_VERIFY(this));
1332 }
1333 } // end while
1335 // Make sure that control flow does not fall through end of the method
1336 if (!no_control_flow) {
1337 verify_error(code_length, "Control flow falls through code end");
1338 return;
1339 }
1340 }
1342 char* ClassVerifier::generate_code_data(methodHandle m, u4 code_length, TRAPS) {
1343 char* code_data = NEW_RESOURCE_ARRAY(char, code_length);
1344 memset(code_data, 0, sizeof(char) * code_length);
1345 RawBytecodeStream bcs(m);
1347 while (!bcs.is_last_bytecode()) {
1348 if (bcs.raw_next() != Bytecodes::_illegal) {
1349 int bci = bcs.bci();
1350 if (bcs.raw_code() == Bytecodes::_new) {
1351 code_data[bci] = NEW_OFFSET;
1352 } else {
1353 code_data[bci] = BYTECODE_OFFSET;
1354 }
1355 } else {
1356 verify_error(bcs.bci(), "Bad instruction");
1357 return NULL;
1358 }
1359 }
1361 return code_data;
1362 }
1364 void ClassVerifier::verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS) {
1365 typeArrayHandle exhandlers (THREAD, _method->exception_table());
1366 constantPoolHandle cp (THREAD, _method->constants());
1368 if (exhandlers() != NULL) {
1369 for(int i = 0; i < exhandlers->length();) {
1370 u2 start_pc = exhandlers->int_at(i++);
1371 u2 end_pc = exhandlers->int_at(i++);
1372 u2 handler_pc = exhandlers->int_at(i++);
1373 if (start_pc >= code_length || code_data[start_pc] == 0) {
1374 class_format_error("Illegal exception table start_pc %d", start_pc);
1375 return;
1376 }
1377 if (end_pc != code_length) { // special case: end_pc == code_length
1378 if (end_pc > code_length || code_data[end_pc] == 0) {
1379 class_format_error("Illegal exception table end_pc %d", end_pc);
1380 return;
1381 }
1382 }
1383 if (handler_pc >= code_length || code_data[handler_pc] == 0) {
1384 class_format_error("Illegal exception table handler_pc %d", handler_pc);
1385 return;
1386 }
1387 int catch_type_index = exhandlers->int_at(i++);
1388 if (catch_type_index != 0) {
1389 VerificationType catch_type = cp_index_to_type(
1390 catch_type_index, cp, CHECK_VERIFY(this));
1391 VerificationType throwable =
1392 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1393 bool is_subclass = throwable.is_assignable_from(
1394 catch_type, this, CHECK_VERIFY(this));
1395 if (!is_subclass) {
1396 // 4286534: should throw VerifyError according to recent spec change
1397 verify_error(
1398 "Catch type is not a subclass of Throwable in handler %d",
1399 handler_pc);
1400 return;
1401 }
1402 }
1403 if (start_pc < min) min = start_pc;
1404 if (end_pc > max) max = end_pc;
1405 }
1406 }
1407 }
1409 void ClassVerifier::verify_local_variable_table(u4 code_length, char* code_data, TRAPS) {
1410 int localvariable_table_length = _method()->localvariable_table_length();
1411 if (localvariable_table_length > 0) {
1412 LocalVariableTableElement* table = _method()->localvariable_table_start();
1413 for (int i = 0; i < localvariable_table_length; i++) {
1414 u2 start_bci = table[i].start_bci;
1415 u2 length = table[i].length;
1417 if (start_bci >= code_length || code_data[start_bci] == 0) {
1418 class_format_error(
1419 "Illegal local variable table start_pc %d", start_bci);
1420 return;
1421 }
1422 u4 end_bci = (u4)(start_bci + length);
1423 if (end_bci != code_length) {
1424 if (end_bci >= code_length || code_data[end_bci] == 0) {
1425 class_format_error( "Illegal local variable table length %d", length);
1426 return;
1427 }
1428 }
1429 }
1430 }
1431 }
1433 u2 ClassVerifier::verify_stackmap_table(u2 stackmap_index, u2 bci,
1434 StackMapFrame* current_frame,
1435 StackMapTable* stackmap_table,
1436 bool no_control_flow, TRAPS) {
1437 if (stackmap_index < stackmap_table->get_frame_count()) {
1438 u2 this_offset = stackmap_table->get_offset(stackmap_index);
1439 if (no_control_flow && this_offset > bci) {
1440 verify_error(bci, "Expecting a stack map frame");
1441 return 0;
1442 }
1443 if (this_offset == bci) {
1444 // See if current stack map can be assigned to the frame in table.
1445 // current_frame is the stackmap frame got from the last instruction.
1446 // If matched, current_frame will be updated by this method.
1447 bool match = stackmap_table->match_stackmap(
1448 current_frame, this_offset, stackmap_index,
1449 !no_control_flow, true, CHECK_VERIFY_(this, 0));
1450 if (!match) {
1451 // report type error
1452 verify_error(bci, "Instruction type does not match stack map");
1453 return 0;
1454 }
1455 stackmap_index++;
1456 } else if (this_offset < bci) {
1457 // current_offset should have met this_offset.
1458 class_format_error("Bad stack map offset %d", this_offset);
1459 return 0;
1460 }
1461 } else if (no_control_flow) {
1462 verify_error(bci, "Expecting a stack map frame");
1463 return 0;
1464 }
1465 return stackmap_index;
1466 }
1468 void ClassVerifier::verify_exception_handler_targets(u2 bci, bool this_uninit, StackMapFrame* current_frame,
1469 StackMapTable* stackmap_table, TRAPS) {
1470 constantPoolHandle cp (THREAD, _method->constants());
1471 typeArrayHandle exhandlers (THREAD, _method->exception_table());
1472 if (exhandlers() != NULL) {
1473 for(int i = 0; i < exhandlers->length();) {
1474 u2 start_pc = exhandlers->int_at(i++);
1475 u2 end_pc = exhandlers->int_at(i++);
1476 u2 handler_pc = exhandlers->int_at(i++);
1477 int catch_type_index = exhandlers->int_at(i++);
1478 if(bci >= start_pc && bci < end_pc) {
1479 u1 flags = current_frame->flags();
1480 if (this_uninit) { flags |= FLAG_THIS_UNINIT; }
1481 StackMapFrame* new_frame = current_frame->frame_in_exception_handler(flags);
1482 if (catch_type_index != 0) {
1483 // We know that this index refers to a subclass of Throwable
1484 VerificationType catch_type = cp_index_to_type(
1485 catch_type_index, cp, CHECK_VERIFY(this));
1486 new_frame->push_stack(catch_type, CHECK_VERIFY(this));
1487 } else {
1488 VerificationType throwable =
1489 VerificationType::reference_type(vmSymbols::java_lang_Throwable());
1490 new_frame->push_stack(throwable, CHECK_VERIFY(this));
1491 }
1492 bool match = stackmap_table->match_stackmap(
1493 new_frame, handler_pc, true, false, CHECK_VERIFY(this));
1494 if (!match) {
1495 verify_error(bci,
1496 "Stack map does not match the one at exception handler %d",
1497 handler_pc);
1498 return;
1499 }
1500 }
1501 }
1502 }
1503 }
1505 void ClassVerifier::verify_cp_index(constantPoolHandle cp, int index, TRAPS) {
1506 int nconstants = cp->length();
1507 if ((index <= 0) || (index >= nconstants)) {
1508 verify_error("Illegal constant pool index %d in class %s",
1509 index, instanceKlass::cast(cp->pool_holder())->external_name());
1510 return;
1511 }
1512 }
1514 void ClassVerifier::verify_cp_type(
1515 int index, constantPoolHandle cp, unsigned int types, TRAPS) {
1517 // In some situations, bytecode rewriting may occur while we're verifying.
1518 // In this case, a constant pool cache exists and some indices refer to that
1519 // instead. Be sure we don't pick up such indices by accident.
1520 // We must check was_recursively_verified() before we get here.
1521 guarantee(cp->cache() == NULL, "not rewritten yet");
1523 verify_cp_index(cp, index, CHECK_VERIFY(this));
1524 unsigned int tag = cp->tag_at(index).value();
1525 if ((types & (1 << tag)) == 0) {
1526 verify_error(
1527 "Illegal type at constant pool entry %d in class %s",
1528 index, instanceKlass::cast(cp->pool_holder())->external_name());
1529 return;
1530 }
1531 }
1533 void ClassVerifier::verify_cp_class_type(
1534 int index, constantPoolHandle cp, TRAPS) {
1535 verify_cp_index(cp, index, CHECK_VERIFY(this));
1536 constantTag tag = cp->tag_at(index);
1537 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1538 verify_error("Illegal type at constant pool entry %d in class %s",
1539 index, instanceKlass::cast(cp->pool_holder())->external_name());
1540 return;
1541 }
1542 }
1544 void ClassVerifier::format_error_message(
1545 const char* fmt, int offset, va_list va) {
1546 ResourceMark rm(_thread);
1547 stringStream message(_message, _message_buffer_len);
1548 message.vprint(fmt, va);
1549 if (!_method.is_null()) {
1550 message.print(" in method %s", _method->name_and_sig_as_C_string());
1551 }
1552 if (offset != -1) {
1553 message.print(" at offset %d", offset);
1554 }
1555 }
1557 void ClassVerifier::verify_error(u2 offset, const char* fmt, ...) {
1558 _exception_type = vmSymbols::java_lang_VerifyError();
1559 va_list va;
1560 va_start(va, fmt);
1561 format_error_message(fmt, offset, va);
1562 va_end(va);
1563 }
1565 void ClassVerifier::verify_error(const char* fmt, ...) {
1566 _exception_type = vmSymbols::java_lang_VerifyError();
1567 va_list va;
1568 va_start(va, fmt);
1569 format_error_message(fmt, -1, va);
1570 va_end(va);
1571 }
1573 void ClassVerifier::class_format_error(const char* msg, ...) {
1574 _exception_type = vmSymbols::java_lang_ClassFormatError();
1575 va_list va;
1576 va_start(va, msg);
1577 format_error_message(msg, -1, va);
1578 va_end(va);
1579 }
1581 klassOop ClassVerifier::load_class(Symbol* name, TRAPS) {
1582 // Get current loader and protection domain first.
1583 oop loader = current_class()->class_loader();
1584 oop protection_domain = current_class()->protection_domain();
1586 return SystemDictionary::resolve_or_fail(
1587 name, Handle(THREAD, loader), Handle(THREAD, protection_domain),
1588 true, CHECK_NULL);
1589 }
1591 bool ClassVerifier::is_protected_access(instanceKlassHandle this_class,
1592 klassOop target_class,
1593 Symbol* field_name,
1594 Symbol* field_sig,
1595 bool is_method) {
1596 No_Safepoint_Verifier nosafepoint;
1598 // If target class isn't a super class of this class, we don't worry about this case
1599 if (!this_class->is_subclass_of(target_class)) {
1600 return false;
1601 }
1602 // Check if the specified method or field is protected
1603 instanceKlass* target_instance = instanceKlass::cast(target_class);
1604 fieldDescriptor fd;
1605 if (is_method) {
1606 methodOop m = target_instance->uncached_lookup_method(field_name, field_sig);
1607 if (m != NULL && m->is_protected()) {
1608 if (!this_class->is_same_class_package(m->method_holder())) {
1609 return true;
1610 }
1611 }
1612 } else {
1613 klassOop member_klass = target_instance->find_field(field_name, field_sig, &fd);
1614 if(member_klass != NULL && fd.is_protected()) {
1615 if (!this_class->is_same_class_package(member_klass)) {
1616 return true;
1617 }
1618 }
1619 }
1620 return false;
1621 }
1623 void ClassVerifier::verify_ldc(
1624 int opcode, u2 index, StackMapFrame *current_frame,
1625 constantPoolHandle cp, u2 bci, TRAPS) {
1626 verify_cp_index(cp, index, CHECK_VERIFY(this));
1627 constantTag tag = cp->tag_at(index);
1628 unsigned int types;
1629 if (opcode == Bytecodes::_ldc || opcode == Bytecodes::_ldc_w) {
1630 if (!tag.is_unresolved_string() && !tag.is_unresolved_klass()) {
1631 types = (1 << JVM_CONSTANT_Integer) | (1 << JVM_CONSTANT_Float)
1632 | (1 << JVM_CONSTANT_String) | (1 << JVM_CONSTANT_Class)
1633 | (1 << JVM_CONSTANT_MethodHandle) | (1 << JVM_CONSTANT_MethodType);
1634 // Note: The class file parser already verified the legality of
1635 // MethodHandle and MethodType constants.
1636 verify_cp_type(index, cp, types, CHECK_VERIFY(this));
1637 }
1638 } else {
1639 assert(opcode == Bytecodes::_ldc2_w, "must be ldc2_w");
1640 types = (1 << JVM_CONSTANT_Double) | (1 << JVM_CONSTANT_Long);
1641 verify_cp_type(index, cp, types, CHECK_VERIFY(this));
1642 }
1643 if (tag.is_string() && cp->is_pseudo_string_at(index)) {
1644 current_frame->push_stack(object_type(), CHECK_VERIFY(this));
1645 } else if (tag.is_string() || tag.is_unresolved_string()) {
1646 current_frame->push_stack(
1647 VerificationType::reference_type(
1648 vmSymbols::java_lang_String()), CHECK_VERIFY(this));
1649 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
1650 current_frame->push_stack(
1651 VerificationType::reference_type(
1652 vmSymbols::java_lang_Class()), CHECK_VERIFY(this));
1653 } else if (tag.is_int()) {
1654 current_frame->push_stack(
1655 VerificationType::integer_type(), CHECK_VERIFY(this));
1656 } else if (tag.is_float()) {
1657 current_frame->push_stack(
1658 VerificationType::float_type(), CHECK_VERIFY(this));
1659 } else if (tag.is_double()) {
1660 current_frame->push_stack_2(
1661 VerificationType::double_type(),
1662 VerificationType::double2_type(), CHECK_VERIFY(this));
1663 } else if (tag.is_long()) {
1664 current_frame->push_stack_2(
1665 VerificationType::long_type(),
1666 VerificationType::long2_type(), CHECK_VERIFY(this));
1667 } else if (tag.is_method_handle()) {
1668 current_frame->push_stack(
1669 VerificationType::reference_type(
1670 vmSymbols::java_dyn_MethodHandle()), CHECK_VERIFY(this));
1671 } else if (tag.is_method_type()) {
1672 current_frame->push_stack(
1673 VerificationType::reference_type(
1674 vmSymbols::java_dyn_MethodType()), CHECK_VERIFY(this));
1675 } else {
1676 verify_error(bci, "Invalid index in ldc");
1677 return;
1678 }
1679 }
1681 void ClassVerifier::verify_switch(
1682 RawBytecodeStream* bcs, u4 code_length, char* code_data,
1683 StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS) {
1684 int bci = bcs->bci();
1685 address bcp = bcs->bcp();
1686 address aligned_bcp = (address) round_to((intptr_t)(bcp + 1), jintSize);
1688 // 4639449 & 4647081: padding bytes must be 0
1689 u2 padding_offset = 1;
1690 while ((bcp + padding_offset) < aligned_bcp) {
1691 if(*(bcp + padding_offset) != 0) {
1692 verify_error(bci, "Nonzero padding byte in lookswitch or tableswitch");
1693 return;
1694 }
1695 padding_offset++;
1696 }
1697 int default_offset = (int) Bytes::get_Java_u4(aligned_bcp);
1698 int keys, delta;
1699 current_frame->pop_stack(
1700 VerificationType::integer_type(), CHECK_VERIFY(this));
1701 if (bcs->raw_code() == Bytecodes::_tableswitch) {
1702 jint low = (jint)Bytes::get_Java_u4(aligned_bcp + jintSize);
1703 jint high = (jint)Bytes::get_Java_u4(aligned_bcp + 2*jintSize);
1704 if (low > high) {
1705 verify_error(bci,
1706 "low must be less than or equal to high in tableswitch");
1707 return;
1708 }
1709 keys = high - low + 1;
1710 if (keys < 0) {
1711 verify_error(bci, "too many keys in tableswitch");
1712 return;
1713 }
1714 delta = 1;
1715 } else {
1716 keys = (int)Bytes::get_Java_u4(aligned_bcp + jintSize);
1717 if (keys < 0) {
1718 verify_error(bci, "number of keys in lookupswitch less than 0");
1719 return;
1720 }
1721 delta = 2;
1722 // Make sure that the lookupswitch items are sorted
1723 for (int i = 0; i < (keys - 1); i++) {
1724 jint this_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i)*jintSize);
1725 jint next_key = Bytes::get_Java_u4(aligned_bcp + (2+2*i+2)*jintSize);
1726 if (this_key >= next_key) {
1727 verify_error(bci, "Bad lookupswitch instruction");
1728 return;
1729 }
1730 }
1731 }
1732 int target = bci + default_offset;
1733 stackmap_table->check_jump_target(current_frame, target, CHECK_VERIFY(this));
1734 for (int i = 0; i < keys; i++) {
1735 target = bci + (jint)Bytes::get_Java_u4(aligned_bcp+(3+i*delta)*jintSize);
1736 stackmap_table->check_jump_target(
1737 current_frame, target, CHECK_VERIFY(this));
1738 }
1739 }
1741 bool ClassVerifier::name_in_supers(
1742 Symbol* ref_name, instanceKlassHandle current) {
1743 klassOop super = current->super();
1744 while (super != NULL) {
1745 if (super->klass_part()->name() == ref_name) {
1746 return true;
1747 }
1748 super = super->klass_part()->super();
1749 }
1750 return false;
1751 }
1753 void ClassVerifier::verify_field_instructions(RawBytecodeStream* bcs,
1754 StackMapFrame* current_frame,
1755 constantPoolHandle cp,
1756 TRAPS) {
1757 u2 index = bcs->get_index_u2();
1758 verify_cp_type(index, cp, 1 << JVM_CONSTANT_Fieldref, CHECK_VERIFY(this));
1760 // Get field name and signature
1761 Symbol* field_name = cp->name_ref_at(index);
1762 Symbol* field_sig = cp->signature_ref_at(index);
1764 if (!SignatureVerifier::is_valid_type_signature(field_sig)) {
1765 class_format_error(
1766 "Invalid signature for field in class %s referenced "
1767 "from constant pool index %d", _klass->external_name(), index);
1768 return;
1769 }
1771 // Get referenced class type
1772 VerificationType ref_class_type = cp_ref_index_to_type(
1773 index, cp, CHECK_VERIFY(this));
1774 if (!ref_class_type.is_object()) {
1775 verify_error(
1776 "Expecting reference to class in class %s at constant pool index %d",
1777 _klass->external_name(), index);
1778 return;
1779 }
1780 VerificationType target_class_type = ref_class_type;
1782 assert(sizeof(VerificationType) == sizeof(uintptr_t),
1783 "buffer type must match VerificationType size");
1784 uintptr_t field_type_buffer[2];
1785 VerificationType* field_type = (VerificationType*)field_type_buffer;
1786 // If we make a VerificationType[2] array directly, the compiler calls
1787 // to the c-runtime library to do the allocation instead of just
1788 // stack allocating it. Plus it would run constructors. This shows up
1789 // in performance profiles.
1791 SignatureStream sig_stream(field_sig, false);
1792 VerificationType stack_object_type;
1793 int n = change_sig_to_verificationType(
1794 &sig_stream, field_type, CHECK_VERIFY(this));
1795 u2 bci = bcs->bci();
1796 bool is_assignable;
1797 switch (bcs->raw_code()) {
1798 case Bytecodes::_getstatic: {
1799 for (int i = 0; i < n; i++) {
1800 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
1801 }
1802 break;
1803 }
1804 case Bytecodes::_putstatic: {
1805 for (int i = n - 1; i >= 0; i--) {
1806 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
1807 }
1808 break;
1809 }
1810 case Bytecodes::_getfield: {
1811 stack_object_type = current_frame->pop_stack(
1812 target_class_type, CHECK_VERIFY(this));
1813 for (int i = 0; i < n; i++) {
1814 current_frame->push_stack(field_type[i], CHECK_VERIFY(this));
1815 }
1816 goto check_protected;
1817 }
1818 case Bytecodes::_putfield: {
1819 for (int i = n - 1; i >= 0; i--) {
1820 current_frame->pop_stack(field_type[i], CHECK_VERIFY(this));
1821 }
1822 stack_object_type = current_frame->pop_stack(CHECK_VERIFY(this));
1824 // The JVMS 2nd edition allows field initialization before the superclass
1825 // initializer, if the field is defined within the current class.
1826 fieldDescriptor fd;
1827 if (stack_object_type == VerificationType::uninitialized_this_type() &&
1828 target_class_type.equals(current_type()) &&
1829 _klass->find_local_field(field_name, field_sig, &fd)) {
1830 stack_object_type = current_type();
1831 }
1832 is_assignable = target_class_type.is_assignable_from(
1833 stack_object_type, this, CHECK_VERIFY(this));
1834 if (!is_assignable) {
1835 verify_error(bci, "Bad type on operand stack in putfield");
1836 return;
1837 }
1838 }
1839 check_protected: {
1840 if (_this_type == stack_object_type)
1841 break; // stack_object_type must be assignable to _current_class_type
1842 Symbol* ref_class_name =
1843 cp->klass_name_at(cp->klass_ref_index_at(index));
1844 if (!name_in_supers(ref_class_name, current_class()))
1845 // stack_object_type must be assignable to _current_class_type since:
1846 // 1. stack_object_type must be assignable to ref_class.
1847 // 2. ref_class must be _current_class or a subclass of it. It can't
1848 // be a superclass of it. See revised JVMS 5.4.4.
1849 break;
1851 klassOop ref_class_oop = load_class(ref_class_name, CHECK);
1852 if (is_protected_access(current_class(), ref_class_oop, field_name,
1853 field_sig, false)) {
1854 // It's protected access, check if stack object is assignable to
1855 // current class.
1856 is_assignable = current_type().is_assignable_from(
1857 stack_object_type, this, CHECK_VERIFY(this));
1858 if (!is_assignable) {
1859 verify_error(bci, "Bad access to protected data in getfield");
1860 return;
1861 }
1862 }
1863 break;
1864 }
1865 default: ShouldNotReachHere();
1866 }
1867 }
1869 void ClassVerifier::verify_invoke_init(
1870 RawBytecodeStream* bcs, VerificationType ref_class_type,
1871 StackMapFrame* current_frame, u4 code_length, bool *this_uninit,
1872 constantPoolHandle cp, TRAPS) {
1873 u2 bci = bcs->bci();
1874 VerificationType type = current_frame->pop_stack(
1875 VerificationType::reference_check(), CHECK_VERIFY(this));
1876 if (type == VerificationType::uninitialized_this_type()) {
1877 // The method must be an <init> method of either this class, or one of its
1878 // superclasses
1879 if (ref_class_type.name() != current_class()->name() &&
1880 !name_in_supers(ref_class_type.name(), current_class())) {
1881 verify_error(bci, "Bad <init> method call");
1882 return;
1883 }
1884 current_frame->initialize_object(type, current_type());
1885 *this_uninit = true;
1886 } else if (type.is_uninitialized()) {
1887 u2 new_offset = type.bci();
1888 address new_bcp = bcs->bcp() - bci + new_offset;
1889 if (new_offset > (code_length - 3) || (*new_bcp) != Bytecodes::_new) {
1890 verify_error(new_offset, "Expecting new instruction");
1891 return;
1892 }
1893 u2 new_class_index = Bytes::get_Java_u2(new_bcp + 1);
1894 verify_cp_class_type(new_class_index, cp, CHECK_VERIFY(this));
1896 // The method must be an <init> method of the indicated class
1897 VerificationType new_class_type = cp_index_to_type(
1898 new_class_index, cp, CHECK_VERIFY(this));
1899 if (!new_class_type.equals(ref_class_type)) {
1900 verify_error(bci, "Call to wrong <init> method");
1901 return;
1902 }
1903 // According to the VM spec, if the referent class is a superclass of the
1904 // current class, and is in a different runtime package, and the method is
1905 // protected, then the objectref must be the current class or a subclass
1906 // of the current class.
1907 VerificationType objectref_type = new_class_type;
1908 if (name_in_supers(ref_class_type.name(), current_class())) {
1909 klassOop ref_klass = load_class(
1910 ref_class_type.name(), CHECK_VERIFY(this));
1911 methodOop m = instanceKlass::cast(ref_klass)->uncached_lookup_method(
1912 vmSymbols::object_initializer_name(),
1913 cp->signature_ref_at(bcs->get_index_u2()));
1914 instanceKlassHandle mh(THREAD, m->method_holder());
1915 if (m->is_protected() && !mh->is_same_class_package(_klass())) {
1916 bool assignable = current_type().is_assignable_from(
1917 objectref_type, this, CHECK_VERIFY(this));
1918 if (!assignable) {
1919 verify_error(bci, "Bad access to protected <init> method");
1920 return;
1921 }
1922 }
1923 }
1924 current_frame->initialize_object(type, new_class_type);
1925 } else {
1926 verify_error(bci, "Bad operand type when invoking <init>");
1927 return;
1928 }
1929 }
1931 void ClassVerifier::verify_invoke_instructions(
1932 RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
1933 bool *this_uninit, VerificationType return_type,
1934 constantPoolHandle cp, TRAPS) {
1935 // Make sure the constant pool item is the right type
1936 u2 index = bcs->get_index_u2();
1937 Bytecodes::Code opcode = bcs->raw_code();
1938 unsigned int types = (opcode == Bytecodes::_invokeinterface
1939 ? 1 << JVM_CONSTANT_InterfaceMethodref
1940 : opcode == Bytecodes::_invokedynamic
1941 ? ((AllowTransitionalJSR292 ? 1 << JVM_CONSTANT_NameAndType : 0)
1942 |1 << JVM_CONSTANT_InvokeDynamic)
1943 : 1 << JVM_CONSTANT_Methodref);
1944 verify_cp_type(index, cp, types, CHECK_VERIFY(this));
1946 // Get method name and signature
1947 Symbol* method_name = cp->name_ref_at(index);
1948 Symbol* method_sig = cp->signature_ref_at(index);
1950 if (!SignatureVerifier::is_valid_method_signature(method_sig)) {
1951 class_format_error(
1952 "Invalid method signature in class %s referenced "
1953 "from constant pool index %d", _klass->external_name(), index);
1954 return;
1955 }
1957 // Get referenced class type
1958 VerificationType ref_class_type;
1959 if (opcode == Bytecodes::_invokedynamic) {
1960 if (!EnableInvokeDynamic ||
1961 _klass->major_version() < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
1962 class_format_error(
1963 (!EnableInvokeDynamic ?
1964 "invokedynamic instructions not enabled in this JVM" :
1965 "invokedynamic instructions not supported by this class file version"),
1966 _klass->external_name());
1967 return;
1968 }
1969 } else {
1970 ref_class_type = cp_ref_index_to_type(index, cp, CHECK_VERIFY(this));
1971 }
1973 // For a small signature length, we just allocate 128 bytes instead
1974 // of parsing the signature once to find its size.
1975 // -3 is for '(', ')' and return descriptor; multiply by 2 is for
1976 // longs/doubles to be consertive.
1977 assert(sizeof(VerificationType) == sizeof(uintptr_t),
1978 "buffer type must match VerificationType size");
1979 uintptr_t on_stack_sig_types_buffer[128];
1980 // If we make a VerificationType[128] array directly, the compiler calls
1981 // to the c-runtime library to do the allocation instead of just
1982 // stack allocating it. Plus it would run constructors. This shows up
1983 // in performance profiles.
1985 VerificationType* sig_types;
1986 int size = (method_sig->utf8_length() - 3) * 2;
1987 if (size > 128) {
1988 // Long and double occupies two slots here.
1989 ArgumentSizeComputer size_it(method_sig);
1990 size = size_it.size();
1991 sig_types = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, VerificationType, size);
1992 } else{
1993 sig_types = (VerificationType*)on_stack_sig_types_buffer;
1994 }
1995 SignatureStream sig_stream(method_sig);
1996 int sig_i = 0;
1997 while (!sig_stream.at_return_type()) {
1998 sig_i += change_sig_to_verificationType(
1999 &sig_stream, &sig_types[sig_i], CHECK_VERIFY(this));
2000 sig_stream.next();
2001 }
2002 int nargs = sig_i;
2004 #ifdef ASSERT
2005 {
2006 ArgumentSizeComputer size_it(method_sig);
2007 assert(nargs == size_it.size(), "Argument sizes do not match");
2008 assert(nargs <= (method_sig->utf8_length() - 3) * 2, "estimate of max size isn't conservative enough");
2009 }
2010 #endif
2012 // Check instruction operands
2013 u2 bci = bcs->bci();
2014 if (opcode == Bytecodes::_invokeinterface) {
2015 address bcp = bcs->bcp();
2016 // 4905268: count operand in invokeinterface should be nargs+1, not nargs.
2017 // JSR202 spec: The count operand of an invokeinterface instruction is valid if it is
2018 // the difference between the size of the operand stack before and after the instruction
2019 // executes.
2020 if (*(bcp+3) != (nargs+1)) {
2021 verify_error(bci, "Inconsistent args count operand in invokeinterface");
2022 return;
2023 }
2024 if (*(bcp+4) != 0) {
2025 verify_error(bci, "Fourth operand byte of invokeinterface must be zero");
2026 return;
2027 }
2028 }
2030 if (opcode == Bytecodes::_invokedynamic) {
2031 address bcp = bcs->bcp();
2032 if (*(bcp+3) != 0 || *(bcp+4) != 0) {
2033 verify_error(bci, "Third and fourth operand bytes of invokedynamic must be zero");
2034 return;
2035 }
2036 }
2038 if (method_name->byte_at(0) == '<') {
2039 // Make sure <init> can only be invoked by invokespecial
2040 if (opcode != Bytecodes::_invokespecial ||
2041 method_name != vmSymbols::object_initializer_name()) {
2042 verify_error(bci, "Illegal call to internal method");
2043 return;
2044 }
2045 } else if (opcode == Bytecodes::_invokespecial
2046 && !ref_class_type.equals(current_type())
2047 && !ref_class_type.equals(VerificationType::reference_type(
2048 current_class()->super()->klass_part()->name()))) {
2049 bool subtype = ref_class_type.is_assignable_from(
2050 current_type(), this, CHECK_VERIFY(this));
2051 if (!subtype) {
2052 verify_error(bci, "Bad invokespecial instruction: "
2053 "current class isn't assignable to reference class.");
2054 return;
2055 }
2056 }
2057 // Match method descriptor with operand stack
2058 for (int i = nargs - 1; i >= 0; i--) { // Run backwards
2059 current_frame->pop_stack(sig_types[i], CHECK_VERIFY(this));
2060 }
2061 // Check objectref on operand stack
2062 if (opcode != Bytecodes::_invokestatic &&
2063 opcode != Bytecodes::_invokedynamic) {
2064 if (method_name == vmSymbols::object_initializer_name()) { // <init> method
2065 verify_invoke_init(bcs, ref_class_type, current_frame,
2066 code_length, this_uninit, cp, CHECK_VERIFY(this));
2067 } else { // other methods
2068 // Ensures that target class is assignable to method class.
2069 if (opcode == Bytecodes::_invokespecial) {
2070 current_frame->pop_stack(current_type(), CHECK_VERIFY(this));
2071 } else if (opcode == Bytecodes::_invokevirtual) {
2072 VerificationType stack_object_type =
2073 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2074 if (current_type() != stack_object_type) {
2075 assert(cp->cache() == NULL, "not rewritten yet");
2076 Symbol* ref_class_name =
2077 cp->klass_name_at(cp->klass_ref_index_at(index));
2078 // See the comments in verify_field_instructions() for
2079 // the rationale behind this.
2080 if (name_in_supers(ref_class_name, current_class())) {
2081 klassOop ref_class = load_class(ref_class_name, CHECK);
2082 if (is_protected_access(
2083 _klass, ref_class, method_name, method_sig, true)) {
2084 // It's protected access, check if stack object is
2085 // assignable to current class.
2086 bool is_assignable = current_type().is_assignable_from(
2087 stack_object_type, this, CHECK_VERIFY(this));
2088 if (!is_assignable) {
2089 if (ref_class_type.name() == vmSymbols::java_lang_Object()
2090 && stack_object_type.is_array()
2091 && method_name == vmSymbols::clone_name()) {
2092 // Special case: arrays pretend to implement public Object
2093 // clone().
2094 } else {
2095 verify_error(bci,
2096 "Bad access to protected data in invokevirtual");
2097 return;
2098 }
2099 }
2100 }
2101 }
2102 }
2103 } else {
2104 assert(opcode == Bytecodes::_invokeinterface, "Unexpected opcode encountered");
2105 current_frame->pop_stack(ref_class_type, CHECK_VERIFY(this));
2106 }
2107 }
2108 }
2109 // Push the result type.
2110 if (sig_stream.type() != T_VOID) {
2111 if (method_name == vmSymbols::object_initializer_name()) {
2112 // <init> method must have a void return type
2113 verify_error(bci, "Return type must be void in <init> method");
2114 return;
2115 }
2116 VerificationType return_type[2];
2117 int n = change_sig_to_verificationType(
2118 &sig_stream, return_type, CHECK_VERIFY(this));
2119 for (int i = 0; i < n; i++) {
2120 current_frame->push_stack(return_type[i], CHECK_VERIFY(this)); // push types backwards
2121 }
2122 }
2123 }
2125 VerificationType ClassVerifier::get_newarray_type(
2126 u2 index, u2 bci, TRAPS) {
2127 const char* from_bt[] = {
2128 NULL, NULL, NULL, NULL, "[Z", "[C", "[F", "[D", "[B", "[S", "[I", "[J",
2129 };
2130 if (index < T_BOOLEAN || index > T_LONG) {
2131 verify_error(bci, "Illegal newarray instruction");
2132 return VerificationType::bogus_type();
2133 }
2135 // from_bt[index] contains the array signature which has a length of 2
2136 Symbol* sig = create_temporary_symbol(
2137 from_bt[index], 2, CHECK_(VerificationType::bogus_type()));
2138 return VerificationType::reference_type(sig);
2139 }
2141 void ClassVerifier::verify_anewarray(
2142 u2 index, constantPoolHandle cp, StackMapFrame* current_frame, TRAPS) {
2143 verify_cp_class_type(index, cp, CHECK_VERIFY(this));
2144 current_frame->pop_stack(
2145 VerificationType::integer_type(), CHECK_VERIFY(this));
2147 VerificationType component_type =
2148 cp_index_to_type(index, cp, CHECK_VERIFY(this));
2149 int length;
2150 char* arr_sig_str;
2151 if (component_type.is_array()) { // it's an array
2152 const char* component_name = component_type.name()->as_utf8();
2153 // add one dimension to component
2154 length = (int)strlen(component_name) + 1;
2155 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2156 arr_sig_str[0] = '[';
2157 strncpy(&arr_sig_str[1], component_name, length - 1);
2158 } else { // it's an object or interface
2159 const char* component_name = component_type.name()->as_utf8();
2160 // add one dimension to component with 'L' prepended and ';' postpended.
2161 length = (int)strlen(component_name) + 3;
2162 arr_sig_str = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, length);
2163 arr_sig_str[0] = '[';
2164 arr_sig_str[1] = 'L';
2165 strncpy(&arr_sig_str[2], component_name, length - 2);
2166 arr_sig_str[length - 1] = ';';
2167 }
2168 Symbol* arr_sig = create_temporary_symbol(
2169 arr_sig_str, length, CHECK_VERIFY(this));
2170 VerificationType new_array_type = VerificationType::reference_type(arr_sig);
2171 current_frame->push_stack(new_array_type, CHECK_VERIFY(this));
2172 }
2174 void ClassVerifier::verify_iload(u2 index, StackMapFrame* current_frame, TRAPS) {
2175 current_frame->get_local(
2176 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2177 current_frame->push_stack(
2178 VerificationType::integer_type(), CHECK_VERIFY(this));
2179 }
2181 void ClassVerifier::verify_lload(u2 index, StackMapFrame* current_frame, TRAPS) {
2182 current_frame->get_local_2(
2183 index, VerificationType::long_type(),
2184 VerificationType::long2_type(), CHECK_VERIFY(this));
2185 current_frame->push_stack_2(
2186 VerificationType::long_type(),
2187 VerificationType::long2_type(), CHECK_VERIFY(this));
2188 }
2190 void ClassVerifier::verify_fload(u2 index, StackMapFrame* current_frame, TRAPS) {
2191 current_frame->get_local(
2192 index, VerificationType::float_type(), CHECK_VERIFY(this));
2193 current_frame->push_stack(
2194 VerificationType::float_type(), CHECK_VERIFY(this));
2195 }
2197 void ClassVerifier::verify_dload(u2 index, StackMapFrame* current_frame, TRAPS) {
2198 current_frame->get_local_2(
2199 index, VerificationType::double_type(),
2200 VerificationType::double2_type(), CHECK_VERIFY(this));
2201 current_frame->push_stack_2(
2202 VerificationType::double_type(),
2203 VerificationType::double2_type(), CHECK_VERIFY(this));
2204 }
2206 void ClassVerifier::verify_aload(u2 index, StackMapFrame* current_frame, TRAPS) {
2207 VerificationType type = current_frame->get_local(
2208 index, VerificationType::reference_check(), CHECK_VERIFY(this));
2209 current_frame->push_stack(type, CHECK_VERIFY(this));
2210 }
2212 void ClassVerifier::verify_istore(u2 index, StackMapFrame* current_frame, TRAPS) {
2213 current_frame->pop_stack(
2214 VerificationType::integer_type(), CHECK_VERIFY(this));
2215 current_frame->set_local(
2216 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2217 }
2219 void ClassVerifier::verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2220 current_frame->pop_stack_2(
2221 VerificationType::long2_type(),
2222 VerificationType::long_type(), CHECK_VERIFY(this));
2223 current_frame->set_local_2(
2224 index, VerificationType::long_type(),
2225 VerificationType::long2_type(), CHECK_VERIFY(this));
2226 }
2228 void ClassVerifier::verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2229 current_frame->pop_stack(VerificationType::float_type(), CHECK_VERIFY(this));
2230 current_frame->set_local(
2231 index, VerificationType::float_type(), CHECK_VERIFY(this));
2232 }
2234 void ClassVerifier::verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS) {
2235 current_frame->pop_stack_2(
2236 VerificationType::double2_type(),
2237 VerificationType::double_type(), CHECK_VERIFY(this));
2238 current_frame->set_local_2(
2239 index, VerificationType::double_type(),
2240 VerificationType::double2_type(), CHECK_VERIFY(this));
2241 }
2243 void ClassVerifier::verify_astore(u2 index, StackMapFrame* current_frame, TRAPS) {
2244 VerificationType type = current_frame->pop_stack(
2245 VerificationType::reference_check(), CHECK_VERIFY(this));
2246 current_frame->set_local(index, type, CHECK_VERIFY(this));
2247 }
2249 void ClassVerifier::verify_iinc(u2 index, StackMapFrame* current_frame, TRAPS) {
2250 VerificationType type = current_frame->get_local(
2251 index, VerificationType::integer_type(), CHECK_VERIFY(this));
2252 current_frame->set_local(index, type, CHECK_VERIFY(this));
2253 }
2255 void ClassVerifier::verify_return_value(
2256 VerificationType return_type, VerificationType type, u2 bci, TRAPS) {
2257 if (return_type == VerificationType::bogus_type()) {
2258 verify_error(bci, "Method expects a return value");
2259 return;
2260 }
2261 bool match = return_type.is_assignable_from(type, this, CHECK_VERIFY(this));
2262 if (!match) {
2263 verify_error(bci, "Bad return type");
2264 return;
2265 }
2266 }
2268 // The verifier creates symbols which are substrings of Symbols.
2269 // These are stored in the verifier until the end of verification so that
2270 // they can be reference counted.
2271 Symbol* ClassVerifier::create_temporary_symbol(const Symbol *s, int begin,
2272 int end, TRAPS) {
2273 Symbol* sym = SymbolTable::new_symbol(s, begin, end, CHECK_NULL);
2274 _symbols->push(sym);
2275 return sym;
2276 }
2278 Symbol* ClassVerifier::create_temporary_symbol(const char *s, int length, TRAPS) {
2279 Symbol* sym = SymbolTable::new_symbol(s, length, CHECK_NULL);
2280 _symbols->push(sym);
2281 return sym;
2282 }
