1 /*
2 * Copyright (c) 1997, 2018, 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 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/nmethod.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "memory/universe.hpp"
33 #include "oops/method.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jniCheck.hpp"
36 #include "runtime/compilationPolicy.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "runtime/interfaceSupport.inline.hpp"
39 #include "runtime/javaCalls.hpp"
40 #include "runtime/jniHandles.inline.hpp"
41 #include "runtime/mutexLocker.hpp"
42 #include "runtime/os.inline.hpp"
43 #include "runtime/sharedRuntime.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/stubRoutines.hpp"
46 #include "runtime/thread.inline.hpp"
47 #if INCLUDE_JVMCI
48 #include "jvmci/jvmciJavaClasses.hpp"
49 #include "jvmci/jvmciRuntime.hpp"
50 #endif
51
52 // -----------------------------------------------------
53 // Implementation of JavaCallWrapper
54
55 JavaCallWrapper::JavaCallWrapper(const methodHandle& callee_method, Handle receiver, JavaValue* result, TRAPS) {
56 JavaThread* thread = (JavaThread *)THREAD;
57 bool clear_pending_exception = true;
58
59 guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
60 assert(!thread->owns_locks(), "must release all locks when leaving VM");
61 guarantee(thread->can_call_java(), "cannot make java calls from the native compiler");
62 _result = result;
63
64 // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub,
65 // since it can potentially block.
66 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
67
68 // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
69 // info, since we cannot find oops before the new information is set up completely.
70 ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java);
71
72 // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state
73 // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions
74 // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state).
75 if (thread->has_special_runtime_exit_condition()) {
76 thread->handle_special_runtime_exit_condition();
77 if (HAS_PENDING_EXCEPTION) {
78 clear_pending_exception = false;
79 }
80 }
81
82
83 // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
84 // the JavaCallWrapper before the entry frame is on the stack.
85 _callee_method = callee_method();
86 _receiver = receiver();
87
88 #ifdef CHECK_UNHANDLED_OOPS
89 THREAD->allow_unhandled_oop(&_receiver);
90 #endif // CHECK_UNHANDLED_OOPS
91
92 _thread = (JavaThread *)thread;
93 _handles = _thread->active_handles(); // save previous handle block & Java frame linkage
94
95 // For the profiler, the last_Java_frame information in thread must always be in
96 // legal state. We have no last Java frame if last_Java_sp == NULL so
97 // the valid transition is to clear _last_Java_sp and then reset the rest of
98 // the (platform specific) state.
99
100 _anchor.copy(_thread->frame_anchor());
101 _thread->frame_anchor()->clear();
102
103 debug_only(_thread->inc_java_call_counter());
104 _thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage
105
106 assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
107
108 // clear any pending exception in thread (native calls start with no exception pending)
109 if(clear_pending_exception) {
110 _thread->clear_pending_exception();
111 }
112
113 if (_anchor.last_Java_sp() == NULL) {
114 _thread->record_base_of_stack_pointer();
115 }
116 }
117
118
119 JavaCallWrapper::~JavaCallWrapper() {
120 assert(_thread == JavaThread::current(), "must still be the same thread");
121
122 // restore previous handle block & Java frame linkage
123 JNIHandleBlock *_old_handles = _thread->active_handles();
124 _thread->set_active_handles(_handles);
125
126 _thread->frame_anchor()->zap();
127
128 debug_only(_thread->dec_java_call_counter());
129
130 if (_anchor.last_Java_sp() == NULL) {
131 _thread->set_base_of_stack_pointer(NULL);
132 }
133
134
135 // Old thread-local info. has been restored. We are not back in the VM.
136 ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
137
138 // State has been restored now make the anchor frame visible for the profiler.
139 // Do this after the transition because this allows us to put an assert
140 // the Java->vm transition which checks to see that stack is not walkable
141 // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
142 // invariants (i.e. _flags always cleared on return to Java)
143
144 _thread->frame_anchor()->copy(&_anchor);
145
146 // Release handles after we are marked as being inside the VM again, since this
147 // operation might block
148 JNIHandleBlock::release_block(_old_handles, _thread);
149 }
150
151
152 void JavaCallWrapper::oops_do(OopClosure* f) {
153 f->do_oop((oop*)&_receiver);
154 handles()->oops_do(f);
155 }
156
157
158 // Helper methods
159 static BasicType runtime_type_from(JavaValue* result) {
160 switch (result->get_type()) {
161 case T_BOOLEAN: // fall through
162 case T_CHAR : // fall through
163 case T_SHORT : // fall through
164 case T_INT : // fall through
165 #ifndef _LP64
166 case T_OBJECT : // fall through
167 case T_ARRAY : // fall through
168 #endif
169 case T_BYTE : // fall through
170 case T_VOID : return T_INT;
171 case T_LONG : return T_LONG;
172 case T_FLOAT : return T_FLOAT;
173 case T_DOUBLE : return T_DOUBLE;
174 #ifdef _LP64
175 case T_ARRAY : // fall through
176 case T_OBJECT: return T_OBJECT;
177 #endif
178 default:
179 ShouldNotReachHere();
180 return T_ILLEGAL;
181 }
182 }
183
184 // ============ Virtual calls ============
185
186 void JavaCalls::call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
187 CallInfo callinfo;
188 Handle receiver = args->receiver();
189 Klass* recvrKlass = receiver.is_null() ? (Klass*)NULL : receiver->klass();
190 LinkInfo link_info(spec_klass, name, signature);
191 LinkResolver::resolve_virtual_call(
192 callinfo, receiver, recvrKlass, link_info, true, CHECK);
193 methodHandle method = callinfo.selected_method();
194 assert(method.not_null(), "should have thrown exception");
195
196 // Invoke the method
197 JavaCalls::call(result, method, args, CHECK);
198 }
199
200
201 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, TRAPS) {
202 JavaCallArguments args(receiver);
203 call_virtual(result, spec_klass, name, signature, &args, CHECK);
204 }
205
206
207 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
208 JavaCallArguments args(receiver);
209 args.push_oop(arg1);
210 call_virtual(result, spec_klass, name, signature, &args, CHECK);
211 }
212
213
214
215 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
216 JavaCallArguments args(receiver);
217 args.push_oop(arg1);
218 args.push_oop(arg2);
219 call_virtual(result, spec_klass, name, signature, &args, CHECK);
220 }
221
222
223 // ============ Special calls ============
224
225 void JavaCalls::call_special(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
226 CallInfo callinfo;
227 LinkInfo link_info(klass, name, signature);
228 LinkResolver::resolve_special_call(callinfo, args->receiver(), link_info, CHECK);
229 methodHandle method = callinfo.selected_method();
230 assert(method.not_null(), "should have thrown exception");
231
232 // Invoke the method
233 JavaCalls::call(result, method, args, CHECK);
234 }
235
236
237 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
238 JavaCallArguments args(receiver);
239 call_special(result, klass, name, signature, &args, CHECK);
240 }
241
242
243 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
244 JavaCallArguments args(receiver);
245 args.push_oop(arg1);
246 call_special(result, klass, name, signature, &args, CHECK);
247 }
248
249
250 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
251 JavaCallArguments args(receiver);
252 args.push_oop(arg1);
253 args.push_oop(arg2);
254 call_special(result, klass, name, signature, &args, CHECK);
255 }
256
257
258 // ============ Static calls ============
259
260 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
261 CallInfo callinfo;
262 LinkInfo link_info(klass, name, signature);
263 LinkResolver::resolve_static_call(callinfo, link_info, true, CHECK);
264 methodHandle method = callinfo.selected_method();
265 assert(method.not_null(), "should have thrown exception");
266
267 // Invoke the method
268 JavaCalls::call(result, method, args, CHECK);
269 }
270
271
272 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
273 JavaCallArguments args;
274 call_static(result, klass, name, signature, &args, CHECK);
275 }
276
277
278 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
279 JavaCallArguments args(arg1);
280 call_static(result, klass, name, signature, &args, CHECK);
281 }
282
283
284 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
285 JavaCallArguments args;
286 args.push_oop(arg1);
287 args.push_oop(arg2);
288 call_static(result, klass, name, signature, &args, CHECK);
289 }
290
291
292 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS) {
293 JavaCallArguments args;
294 args.push_oop(arg1);
295 args.push_oop(arg2);
296 args.push_oop(arg3);
297 call_static(result, klass, name, signature, &args, CHECK);
298 }
299
300 // ============ allocate and initialize new object instance ============
301
302 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, JavaCallArguments* args, TRAPS) {
303 klass->initialize(CHECK_NH); // Quick no-op if already initialized.
304 Handle obj = klass->allocate_instance_handle(CHECK_NH);
305 JavaValue void_result(T_VOID);
306 args->set_receiver(obj); // inserts <obj> as the first argument.
307 JavaCalls::call_special(&void_result, klass,
308 vmSymbols::object_initializer_name(),
309 constructor_signature, args, CHECK_NH);
310 // Already returned a Null Handle if any exception is pending.
311 return obj;
312 }
313
314 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, TRAPS) {
315 JavaCallArguments args;
316 return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
317 }
318
319 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, TRAPS) {
320 JavaCallArguments args;
321 args.push_oop(arg1);
322 return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
323 }
324
325 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, Handle arg2, TRAPS) {
326 JavaCallArguments args;
327 args.push_oop(arg1);
328 args.push_oop(arg2);
329 return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
330 }
331
332 // -------------------------------------------------
333 // Implementation of JavaCalls (low level)
334
335
336 void JavaCalls::call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
337 // Check if we need to wrap a potential OS exception handler around thread
338 // This is used for e.g. Win32 structured exception handlers
339 assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
340 // Need to wrap each and every time, since there might be native code down the
341 // stack that has installed its own exception handlers
342 os::os_exception_wrapper(call_helper, result, method, args, THREAD);
343 }
344
345 void JavaCalls::call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
346
347 JavaThread* thread = (JavaThread*)THREAD;
348 assert(thread->is_Java_thread(), "must be called by a java thread");
349 assert(method.not_null(), "must have a method to call");
350 assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
351 assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
352
353
354 CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
355
356 #if INCLUDE_JVMCI
357 // Gets the nmethod (if any) that should be called instead of normal target
358 nmethod* alternative_target = args->alternative_target();
359 if (alternative_target == NULL) {
360 #endif
361 // Verify the arguments
362
363 if (CheckJNICalls) {
364 args->verify(method, result->get_type());
365 }
366 else debug_only(args->verify(method, result->get_type()));
367 #if INCLUDE_JVMCI
368 }
369 #else
370
371 // Ignore call if method is empty
372 if (method->is_empty_method()) {
373 assert(result->get_type() == T_VOID, "an empty method must return a void value");
374 return;
375 }
376 #endif
377
378 #ifdef ASSERT
379 { InstanceKlass* holder = method->method_holder();
380 // A klass might not be initialized since JavaCall's might be used during the executing of
381 // the <clinit>. For example, a Thread.start might start executing on an object that is
382 // not fully initialized! (bad Java programming style)
383 assert(holder->is_linked(), "rewriting must have taken place");
384 }
385 #endif
386
387 CompilationPolicy::compile_if_required(method, CHECK);
388
389 // Since the call stub sets up like the interpreter we call the from_interpreted_entry
390 // so we can go compiled via a i2c. Otherwise initial entry method will always
391 // run interpreted.
392 address entry_point = method->from_interpreted_entry();
393 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
394 entry_point = method->interpreter_entry();
395 }
396
397 // Figure out if the result value is an oop or not (Note: This is a different value
398 // than result_type. result_type will be T_INT of oops. (it is about size)
399 BasicType result_type = runtime_type_from(result);
400 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY);
401
402 // NOTE: if we move the computation of the result_val_address inside
403 // the call to call_stub, the optimizer produces wrong code.
404 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
405
406 // Find receiver
407 Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
408
409 // When we reenter Java, we need to reenable the reserved/yellow zone which
410 // might already be disabled when we are in VM.
411 if (!thread->stack_guards_enabled()) {
412 thread->reguard_stack();
413 }
414
415 // Check that there are shadow pages available before changing thread state
416 // to Java. Calculate current_stack_pointer here to make sure
417 // stack_shadow_pages_available() and bang_stack_shadow_pages() use the same sp.
418 address sp = os::current_stack_pointer();
419 if (!os::stack_shadow_pages_available(THREAD, method, sp)) {
420 // Throw stack overflow exception with preinitialized exception.
421 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method);
422 return;
423 } else {
424 // Touch pages checked if the OS needs them to be touched to be mapped.
425 os::map_stack_shadow_pages(sp);
426 }
427
428 #if INCLUDE_JVMCI
429 if (alternative_target != NULL) {
430 if (alternative_target->is_alive()) {
431 thread->set_jvmci_alternate_call_target(alternative_target->verified_entry_point());
432 entry_point = method->adapter()->get_i2c_entry();
433 } else {
434 THROW(vmSymbols::jdk_vm_ci_code_InvalidInstalledCodeException());
435 }
436 }
437 #endif
438
439 // do call
440 { JavaCallWrapper link(method, receiver, result, CHECK);
441 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner
442
443 StubRoutines::call_stub()(
444 (address)&link,
445 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
446 result_val_address, // see NOTE above (compiler problem)
447 result_type,
448 method(),
449 entry_point,
450 args->parameters(),
451 args->size_of_parameters(),
452 CHECK
453 );
454
455 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
456 // Preserve oop return value across possible gc points
457 if (oop_result_flag) {
458 thread->set_vm_result((oop) result->get_jobject());
459 }
460 }
461 } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
462
463 // Check if a thread stop or suspend should be executed
464 // The following assert was not realistic. Thread.stop can set that bit at any moment.
465 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
466
467 // Restore possible oop return
468 if (oop_result_flag) {
469 result->set_jobject((jobject)thread->vm_result());
470 thread->set_vm_result(NULL);
471 }
472 }
473
474
475 //--------------------------------------------------------------------------------------
476 // Implementation of JavaCallArguments
477
478 inline bool is_value_state_indirect_oop(uint state) {
479 assert(state != JavaCallArguments::value_state_oop,
480 "Checking for handles after removal");
481 assert(state < JavaCallArguments::value_state_limit,
482 "Invalid value state %u", state);
483 return state != JavaCallArguments::value_state_primitive;
484 }
485
486 inline oop resolve_indirect_oop(intptr_t value, uint state) {
487 switch (state) {
488 case JavaCallArguments::value_state_handle:
489 {
490 oop* ptr = reinterpret_cast<oop*>(value);
491 return Handle::raw_resolve(ptr);
492 }
493
494 case JavaCallArguments::value_state_jobject:
495 {
496 jobject obj = reinterpret_cast<jobject>(value);
497 return JNIHandles::resolve(obj);
498 }
499
500 default:
501 ShouldNotReachHere();
502 return NULL;
503 }
504 }
505
506 intptr_t* JavaCallArguments::parameters() {
507 // First convert all handles to oops
508 for(int i = 0; i < _size; i++) {
509 uint state = _value_state[i];
510 assert(state != value_state_oop, "Multiple handle conversions");
511 if (is_value_state_indirect_oop(state)) {
512 oop obj = resolve_indirect_oop(_value[i], state);
513 _value[i] = cast_from_oop<intptr_t>(obj);
514 _value_state[i] = value_state_oop;
515 }
516 }
517 // Return argument vector
518 return _value;
519 }
520
521
522 class SignatureChekker : public SignatureIterator {
523 private:
524 int _pos;
525 BasicType _return_type;
526 u_char* _value_state;
527 intptr_t* _value;
528
529 public:
530 bool _is_return;
531
532 SignatureChekker(Symbol* signature,
533 BasicType return_type,
534 bool is_static,
535 u_char* value_state,
536 intptr_t* value) :
537 SignatureIterator(signature),
538 _pos(0),
539 _return_type(return_type),
540 _value_state(value_state),
541 _value(value),
542 _is_return(false)
543 {
544 if (!is_static) {
545 check_value(true); // Receiver must be an oop
546 }
547 }
548
549 void check_value(bool type) {
550 uint state = _value_state[_pos++];
551 if (type) {
552 guarantee(is_value_state_indirect_oop(state),
553 "signature does not match pushed arguments: %u at %d",
554 state, _pos - 1);
555 } else {
556 guarantee(state == JavaCallArguments::value_state_primitive,
557 "signature does not match pushed arguments: %u at %d",
558 state, _pos - 1);
559 }
560 }
561
562 void check_doing_return(bool state) { _is_return = state; }
563
564 void check_return_type(BasicType t) {
565 guarantee(_is_return && t == _return_type, "return type does not match");
566 }
567
568 void check_int(BasicType t) {
569 if (_is_return) {
570 check_return_type(t);
571 return;
572 }
573 check_value(false);
574 }
575
576 void check_double(BasicType t) { check_long(t); }
577
578 void check_long(BasicType t) {
579 if (_is_return) {
580 check_return_type(t);
581 return;
582 }
583
584 check_value(false);
585 check_value(false);
586 }
587
588 void check_obj(BasicType t) {
589 if (_is_return) {
590 check_return_type(t);
591 return;
592 }
593
594 intptr_t v = _value[_pos];
595 if (v != 0) {
596 // v is a "handle" referring to an oop, cast to integral type.
597 // There shouldn't be any handles in very low memory.
598 guarantee((size_t)v >= (size_t)os::vm_page_size(),
599 "Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
600 // Verify the pointee.
601 oop vv = resolve_indirect_oop(v, _value_state[_pos]);
602 guarantee(oopDesc::is_oop_or_null(vv, true),
603 "Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
604 _pos, v, p2i(vv));
605 }
606
607 check_value(true); // Verify value state.
608 }
609
610 void do_bool() { check_int(T_BOOLEAN); }
611 void do_char() { check_int(T_CHAR); }
612 void do_float() { check_int(T_FLOAT); }
613 void do_double() { check_double(T_DOUBLE); }
614 void do_byte() { check_int(T_BYTE); }
615 void do_short() { check_int(T_SHORT); }
616 void do_int() { check_int(T_INT); }
617 void do_long() { check_long(T_LONG); }
618 void do_void() { check_return_type(T_VOID); }
619 void do_object(int begin, int end) { check_obj(T_OBJECT); }
620 void do_array(int begin, int end) { check_obj(T_OBJECT); }
621 };
622
623
624 void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
625 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
626
627 // Treat T_OBJECT and T_ARRAY as the same
628 if (return_type == T_ARRAY) return_type = T_OBJECT;
629
630 // Check that oop information is correct
631 Symbol* signature = method->signature();
632
633 SignatureChekker sc(signature,
634 return_type,
635 method->is_static(),
636 _value_state,
637 _value);
638 sc.iterate_parameters();
639 sc.check_doing_return(true);
640 sc.iterate_returntype();
641 }