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 return obj;
311 }
312
313 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, TRAPS) {
314 JavaCallArguments args;
315 return JavaCalls::construct_new_instance(klass, constructor_signature, &args, CHECK_NH);
316 }
317
318 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, TRAPS) {
319 JavaCallArguments args;
320 args.push_oop(arg1);
321 return JavaCalls::construct_new_instance(klass, constructor_signature, &args, CHECK_NH);
322 }
323
324 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, Handle arg2, TRAPS) {
325 JavaCallArguments args;
326 args.push_oop(arg1);
327 args.push_oop(arg2);
328 return JavaCalls::construct_new_instance(klass, constructor_signature, &args, CHECK_NH);
329 }
330
331 // -------------------------------------------------
332 // Implementation of JavaCalls (low level)
333
334
335 void JavaCalls::call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
336 // Check if we need to wrap a potential OS exception handler around thread
337 // This is used for e.g. Win32 structured exception handlers
338 assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
339 // Need to wrap each and every time, since there might be native code down the
340 // stack that has installed its own exception handlers
341 os::os_exception_wrapper(call_helper, result, method, args, THREAD);
342 }
343
344 void JavaCalls::call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
345
346 JavaThread* thread = (JavaThread*)THREAD;
347 assert(thread->is_Java_thread(), "must be called by a java thread");
348 assert(method.not_null(), "must have a method to call");
349 assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
350 assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
351
352
353 CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
354
355 #if INCLUDE_JVMCI
356 // Gets the nmethod (if any) that should be called instead of normal target
357 nmethod* alternative_target = args->alternative_target();
358 if (alternative_target == NULL) {
359 #endif
360 // Verify the arguments
361
362 if (CheckJNICalls) {
363 args->verify(method, result->get_type());
364 }
365 else debug_only(args->verify(method, result->get_type()));
366 #if INCLUDE_JVMCI
367 }
368 #else
369
370 // Ignore call if method is empty
371 if (method->is_empty_method()) {
372 assert(result->get_type() == T_VOID, "an empty method must return a void value");
373 return;
374 }
375 #endif
376
377 #ifdef ASSERT
378 { InstanceKlass* holder = method->method_holder();
379 // A klass might not be initialized since JavaCall's might be used during the executing of
380 // the <clinit>. For example, a Thread.start might start executing on an object that is
381 // not fully initialized! (bad Java programming style)
382 assert(holder->is_linked(), "rewriting must have taken place");
383 }
384 #endif
385
386 CompilationPolicy::compile_if_required(method, CHECK);
387
388 // Since the call stub sets up like the interpreter we call the from_interpreted_entry
389 // so we can go compiled via a i2c. Otherwise initial entry method will always
390 // run interpreted.
391 address entry_point = method->from_interpreted_entry();
392 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
393 entry_point = method->interpreter_entry();
394 }
395
396 // Figure out if the result value is an oop or not (Note: This is a different value
397 // than result_type. result_type will be T_INT of oops. (it is about size)
398 BasicType result_type = runtime_type_from(result);
399 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY);
400
401 // NOTE: if we move the computation of the result_val_address inside
402 // the call to call_stub, the optimizer produces wrong code.
403 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
404
405 // Find receiver
406 Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
407
408 // When we reenter Java, we need to reenable the reserved/yellow zone which
409 // might already be disabled when we are in VM.
410 if (!thread->stack_guards_enabled()) {
411 thread->reguard_stack();
412 }
413
414 // Check that there are shadow pages available before changing thread state
415 // to Java. Calculate current_stack_pointer here to make sure
416 // stack_shadow_pages_available() and bang_stack_shadow_pages() use the same sp.
417 address sp = os::current_stack_pointer();
418 if (!os::stack_shadow_pages_available(THREAD, method, sp)) {
419 // Throw stack overflow exception with preinitialized exception.
420 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method);
421 return;
422 } else {
423 // Touch pages checked if the OS needs them to be touched to be mapped.
424 os::map_stack_shadow_pages(sp);
425 }
426
427 #if INCLUDE_JVMCI
428 if (alternative_target != NULL) {
429 if (alternative_target->is_alive()) {
430 thread->set_jvmci_alternate_call_target(alternative_target->verified_entry_point());
431 entry_point = method->adapter()->get_i2c_entry();
432 } else {
433 THROW(vmSymbols::jdk_vm_ci_code_InvalidInstalledCodeException());
434 }
435 }
436 #endif
437
438 // do call
439 { JavaCallWrapper link(method, receiver, result, CHECK);
440 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner
441
442 StubRoutines::call_stub()(
443 (address)&link,
444 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
445 result_val_address, // see NOTE above (compiler problem)
446 result_type,
447 method(),
448 entry_point,
449 args->parameters(),
450 args->size_of_parameters(),
451 CHECK
452 );
453
454 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
455 // Preserve oop return value across possible gc points
456 if (oop_result_flag) {
457 thread->set_vm_result((oop) result->get_jobject());
458 }
459 }
460 } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
461
462 // Check if a thread stop or suspend should be executed
463 // The following assert was not realistic. Thread.stop can set that bit at any moment.
464 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
465
466 // Restore possible oop return
467 if (oop_result_flag) {
468 result->set_jobject((jobject)thread->vm_result());
469 thread->set_vm_result(NULL);
470 }
471 }
472
473
474 //--------------------------------------------------------------------------------------
475 // Implementation of JavaCallArguments
476
477 inline bool is_value_state_indirect_oop(uint state) {
478 assert(state != JavaCallArguments::value_state_oop,
479 "Checking for handles after removal");
480 assert(state < JavaCallArguments::value_state_limit,
481 "Invalid value state %u", state);
482 return state != JavaCallArguments::value_state_primitive;
483 }
484
485 inline oop resolve_indirect_oop(intptr_t value, uint state) {
486 switch (state) {
487 case JavaCallArguments::value_state_handle:
488 {
489 oop* ptr = reinterpret_cast<oop*>(value);
490 return Handle::raw_resolve(ptr);
491 }
492
493 case JavaCallArguments::value_state_jobject:
494 {
495 jobject obj = reinterpret_cast<jobject>(value);
496 return JNIHandles::resolve(obj);
497 }
498
499 default:
500 ShouldNotReachHere();
501 return NULL;
502 }
503 }
504
505 intptr_t* JavaCallArguments::parameters() {
506 // First convert all handles to oops
507 for(int i = 0; i < _size; i++) {
508 uint state = _value_state[i];
509 assert(state != value_state_oop, "Multiple handle conversions");
510 if (is_value_state_indirect_oop(state)) {
511 oop obj = resolve_indirect_oop(_value[i], state);
512 _value[i] = cast_from_oop<intptr_t>(obj);
513 _value_state[i] = value_state_oop;
514 }
515 }
516 // Return argument vector
517 return _value;
518 }
519
520
521 class SignatureChekker : public SignatureIterator {
522 private:
523 int _pos;
524 BasicType _return_type;
525 u_char* _value_state;
526 intptr_t* _value;
527
528 public:
529 bool _is_return;
530
531 SignatureChekker(Symbol* signature,
532 BasicType return_type,
533 bool is_static,
534 u_char* value_state,
535 intptr_t* value) :
536 SignatureIterator(signature),
537 _pos(0),
538 _return_type(return_type),
539 _value_state(value_state),
540 _value(value),
541 _is_return(false)
542 {
543 if (!is_static) {
544 check_value(true); // Receiver must be an oop
545 }
546 }
547
548 void check_value(bool type) {
549 uint state = _value_state[_pos++];
550 if (type) {
551 guarantee(is_value_state_indirect_oop(state),
552 "signature does not match pushed arguments: %u at %d",
553 state, _pos - 1);
554 } else {
555 guarantee(state == JavaCallArguments::value_state_primitive,
556 "signature does not match pushed arguments: %u at %d",
557 state, _pos - 1);
558 }
559 }
560
561 void check_doing_return(bool state) { _is_return = state; }
562
563 void check_return_type(BasicType t) {
564 guarantee(_is_return && t == _return_type, "return type does not match");
565 }
566
567 void check_int(BasicType t) {
568 if (_is_return) {
569 check_return_type(t);
570 return;
571 }
572 check_value(false);
573 }
574
575 void check_double(BasicType t) { check_long(t); }
576
577 void check_long(BasicType t) {
578 if (_is_return) {
579 check_return_type(t);
580 return;
581 }
582
583 check_value(false);
584 check_value(false);
585 }
586
587 void check_obj(BasicType t) {
588 if (_is_return) {
589 check_return_type(t);
590 return;
591 }
592
593 intptr_t v = _value[_pos];
594 if (v != 0) {
595 // v is a "handle" referring to an oop, cast to integral type.
596 // There shouldn't be any handles in very low memory.
597 guarantee((size_t)v >= (size_t)os::vm_page_size(),
598 "Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
599 // Verify the pointee.
600 oop vv = resolve_indirect_oop(v, _value_state[_pos]);
601 guarantee(oopDesc::is_oop_or_null(vv, true),
602 "Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
603 _pos, v, p2i(vv));
604 }
605
606 check_value(true); // Verify value state.
607 }
608
609 void do_bool() { check_int(T_BOOLEAN); }
610 void do_char() { check_int(T_CHAR); }
611 void do_float() { check_int(T_FLOAT); }
612 void do_double() { check_double(T_DOUBLE); }
613 void do_byte() { check_int(T_BYTE); }
614 void do_short() { check_int(T_SHORT); }
615 void do_int() { check_int(T_INT); }
616 void do_long() { check_long(T_LONG); }
617 void do_void() { check_return_type(T_VOID); }
618 void do_object(int begin, int end) { check_obj(T_OBJECT); }
619 void do_array(int begin, int end) { check_obj(T_OBJECT); }
620 };
621
622
623 void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
624 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
625
626 // Treat T_OBJECT and T_ARRAY as the same
627 if (return_type == T_ARRAY) return_type = T_OBJECT;
628
629 // Check that oop information is correct
630 Symbol* signature = method->signature();
631
632 SignatureChekker sc(signature,
633 return_type,
634 method->is_static(),
635 _value_state,
636 _value);
637 sc.iterate_parameters();
638 sc.check_doing_return(true);
639 sc.iterate_returntype();
640 }