1 /*
  2  * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
  3  * Copyright (c) 2021, Azul Systems, Inc. All rights reserved.
  4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  5  *
  6  * This code is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License version 2 only, as
  8  * published by the Free Software Foundation.
  9  *
 10  * This code is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * version 2 for more details (a copy is included in the LICENSE file that
 14  * accompanied this code).
 15  *
 16  * You should have received a copy of the GNU General Public License version
 17  * 2 along with this work; if not, write to the Free Software Foundation,
 18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 21  * or visit www.oracle.com if you need additional information or have any
 22  * questions.
 23  *
 24  */
 25 
 26 #include "precompiled.hpp"
 27 #include "classfile/vmSymbols.hpp"
 28 #include "code/nmethod.hpp"
 29 #include "compiler/compilationPolicy.hpp"
 30 #include "compiler/compileBroker.hpp"
 31 #include "interpreter/interpreter.hpp"
 32 #include "interpreter/linkResolver.hpp"
 33 #include "memory/universe.hpp"
 34 #include "oops/method.inline.hpp"
 35 #include "oops/oop.inline.hpp"
 36 #include "oops/inlineKlass.hpp"
 37 #include "prims/jniCheck.hpp"
 38 #include "prims/jvmtiExport.hpp"
 39 #include "runtime/handles.inline.hpp"
 40 #include "runtime/interfaceSupport.inline.hpp"
 41 #include "runtime/javaCalls.hpp"
 42 #include "runtime/javaThread.hpp"
 43 #include "runtime/jniHandles.inline.hpp"
 44 #include "runtime/mutexLocker.hpp"
 45 #include "runtime/os.inline.hpp"
 46 #include "runtime/sharedRuntime.hpp"
 47 #include "runtime/signature.hpp"
 48 #include "runtime/stubRoutines.hpp"
 49 #include "runtime/thread.inline.hpp"
 50 #if INCLUDE_JVMCI
 51 #include "jvmci/jvmciJavaClasses.hpp"
 52 #endif
 53 
 54 // -----------------------------------------------------
 55 // Implementation of JavaCallWrapper
 56 
 57 JavaCallWrapper::JavaCallWrapper(const methodHandle& callee_method, Handle receiver, JavaValue* result, TRAPS) {
 58   JavaThread* thread = THREAD;
 59 
 60   guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
 61   assert(!thread->owns_locks(), "must release all locks when leaving VM");
 62   guarantee(thread->can_call_java(), "cannot make java calls from the native compiler");
 63   _result   = result;
 64 
 65   // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub,
 66   // since it can potentially block.
 67   JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
 68 
 69   // clear any pending exception in thread (native calls start with no exception pending)
 70   thread->clear_pending_exception();
 71 
 72   // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
 73   // info, since we cannot find oops before the new information is set up completely.
 74   ThreadStateTransition::transition_from_vm(thread, _thread_in_Java, true /* check_asyncs */);
 75 
 76   // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
 77   // the JavaCallWrapper before the entry frame is on the stack.
 78   _callee_method = callee_method();
 79   _receiver = receiver();
 80 
 81 #ifdef CHECK_UNHANDLED_OOPS
 82   THREAD->allow_unhandled_oop(&_receiver);
 83 #endif // CHECK_UNHANDLED_OOPS
 84 
 85   _thread       = thread;
 86   _handles      = _thread->active_handles();    // save previous handle block & Java frame linkage
 87 
 88   // For the profiler, the last_Java_frame information in thread must always be in
 89   // legal state. We have no last Java frame if last_Java_sp == nullptr so
 90   // the valid transition is to clear _last_Java_sp and then reset the rest of
 91   // the (platform specific) state.
 92 
 93   _anchor.copy(_thread->frame_anchor());
 94   _thread->frame_anchor()->clear();
 95 
 96   debug_only(_thread->inc_java_call_counter());
 97   _thread->set_active_handles(new_handles);     // install new handle block and reset Java frame linkage
 98 
 99   MACOS_AARCH64_ONLY(_thread->enable_wx(WXExec));
100 }
101 
102 
103 JavaCallWrapper::~JavaCallWrapper() {
104   assert(_thread == JavaThread::current(), "must still be the same thread");
105 
106   MACOS_AARCH64_ONLY(_thread->enable_wx(WXWrite));
107 
108   // restore previous handle block & Java frame linkage
109   JNIHandleBlock *_old_handles = _thread->active_handles();
110   _thread->set_active_handles(_handles);
111 
112   _thread->frame_anchor()->zap();
113 
114   debug_only(_thread->dec_java_call_counter());
115 
116   // Old thread-local info. has been restored. We are not back in the VM.
117   ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
118 
119   // State has been restored now make the anchor frame visible for the profiler.
120   // Do this after the transition because this allows us to put an assert
121   // the Java->vm transition which checks to see that stack is not walkable
122   // on sparc/ia64 which will catch violations of the resetting of last_Java_frame
123   // invariants (i.e. _flags always cleared on return to Java)
124 
125   _thread->frame_anchor()->copy(&_anchor);
126 
127   // Release handles after we are marked as being inside the VM again, since this
128   // operation might block
129   JNIHandleBlock::release_block(_old_handles, _thread);
130 
131   if (_thread->has_pending_exception() && _thread->has_last_Java_frame()) {
132     // If we get here, the Java code threw an exception that unwound a frame.
133     // It could be that the new frame anchor has not passed through the required
134     // StackWatermark barriers. Therefore, we process any such deferred unwind
135     // requests here.
136     StackWatermarkSet::after_unwind(_thread);
137   }
138 }
139 
140 
141 void JavaCallWrapper::oops_do(OopClosure* f) {
142   f->do_oop((oop*)&_receiver);
143   handles()->oops_do(f);
144 }
145 
146 
147 // Helper methods
148 static BasicType runtime_type_from(JavaValue* result) {
149   switch (result->get_type()) {
150     case T_BOOLEAN  : // fall through
151     case T_CHAR     : // fall through
152     case T_SHORT    : // fall through
153     case T_INT      : // fall through
154 #ifndef _LP64
155     case T_OBJECT   : // fall through
156     case T_ARRAY    : // fall through
157     case T_PRIMITIVE_OBJECT: // fall through
158 #endif
159     case T_BYTE     : // fall through
160     case T_VOID     : return T_INT;
161     case T_LONG     : return T_LONG;
162     case T_FLOAT    : return T_FLOAT;
163     case T_DOUBLE   : return T_DOUBLE;
164 #ifdef _LP64
165     case T_ARRAY    : // fall through
166     case T_OBJECT   : return T_OBJECT;
167 #endif
168     default:
169       ShouldNotReachHere();
170       return T_ILLEGAL;
171   }
172 }
173 
174 // ============ Virtual calls ============
175 
176 void JavaCalls::call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
177   CallInfo callinfo;
178   Handle receiver = args->receiver();
179   Klass* recvrKlass = receiver.is_null() ? (Klass*)nullptr : receiver->klass();
180   LinkInfo link_info(spec_klass, name, signature);
181   LinkResolver::resolve_virtual_call(
182           callinfo, receiver, recvrKlass, link_info, true, CHECK);
183   methodHandle method(THREAD, callinfo.selected_method());
184   assert(method.not_null(), "should have thrown exception");
185 
186   // Invoke the method
187   JavaCalls::call(result, method, args, CHECK);
188 }
189 
190 
191 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, TRAPS) {
192   JavaCallArguments args(receiver);
193   call_virtual(result, spec_klass, name, signature, &args, CHECK);
194 }
195 
196 
197 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
198   JavaCallArguments args(receiver);
199   args.push_oop(arg1);
200   call_virtual(result, spec_klass, name, signature, &args, CHECK);
201 }
202 
203 
204 
205 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
206   JavaCallArguments args(receiver);
207   args.push_oop(arg1);
208   args.push_oop(arg2);
209   call_virtual(result, spec_klass, name, signature, &args, CHECK);
210 }
211 
212 
213 // ============ Special calls ============
214 
215 void JavaCalls::call_special(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
216   CallInfo callinfo;
217   LinkInfo link_info(klass, name, signature);
218   LinkResolver::resolve_special_call(callinfo, args->receiver(), link_info, CHECK);
219   methodHandle method(THREAD, callinfo.selected_method());
220   assert(method.not_null(), "should have thrown exception");
221 
222   // Invoke the method
223   JavaCalls::call(result, method, args, CHECK);
224 }
225 
226 
227 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
228   JavaCallArguments args(receiver);
229   call_special(result, klass, name, signature, &args, CHECK);
230 }
231 
232 
233 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
234   JavaCallArguments args(receiver);
235   args.push_oop(arg1);
236   call_special(result, klass, name, signature, &args, CHECK);
237 }
238 
239 
240 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
241   JavaCallArguments args(receiver);
242   args.push_oop(arg1);
243   args.push_oop(arg2);
244   call_special(result, klass, name, signature, &args, CHECK);
245 }
246 
247 
248 // ============ Static calls ============
249 
250 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
251   CallInfo callinfo;
252   LinkInfo link_info(klass, name, signature);
253   LinkResolver::resolve_static_call(callinfo, link_info, true, CHECK);
254   methodHandle method(THREAD, callinfo.selected_method());
255   assert(method.not_null(), "should have thrown exception");
256 
257   // Invoke the method
258   JavaCalls::call(result, method, args, CHECK);
259 }
260 
261 
262 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
263   JavaCallArguments args;
264   call_static(result, klass, name, signature, &args, CHECK);
265 }
266 
267 
268 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
269   JavaCallArguments args(arg1);
270   call_static(result, klass, name, signature, &args, CHECK);
271 }
272 
273 
274 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
275   JavaCallArguments args;
276   args.push_oop(arg1);
277   args.push_oop(arg2);
278   call_static(result, klass, name, signature, &args, CHECK);
279 }
280 
281 
282 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS) {
283   JavaCallArguments args;
284   args.push_oop(arg1);
285   args.push_oop(arg2);
286   args.push_oop(arg3);
287   call_static(result, klass, name, signature, &args, CHECK);
288 }
289 
290 // ============ allocate and initialize new object instance ============
291 
292 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, JavaCallArguments* args, TRAPS) {
293   klass->initialize(CHECK_NH); // Quick no-op if already initialized.
294   Handle obj = klass->allocate_instance_handle(CHECK_NH);
295   JavaValue void_result(T_VOID);
296   args->set_receiver(obj); // inserts <obj> as the first argument.
297   JavaCalls::call_special(&void_result, klass,
298                           vmSymbols::object_initializer_name(),
299                           constructor_signature, args, CHECK_NH);
300   // Already returned a Null Handle if any exception is pending.
301   return obj;
302 }
303 
304 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, TRAPS) {
305   JavaCallArguments args;
306   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
307 }
308 
309 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, TRAPS) {
310   JavaCallArguments args;
311   args.push_oop(arg1);
312   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
313 }
314 
315 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, Handle arg2, TRAPS) {
316   JavaCallArguments args;
317   args.push_oop(arg1);
318   args.push_oop(arg2);
319   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
320 }
321 
322 // -------------------------------------------------
323 // Implementation of JavaCalls (low level)
324 
325 
326 void JavaCalls::call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
327   // Check if we need to wrap a potential OS exception handler around thread.
328   // This is used for e.g. Win32 structured exception handlers.
329   // Need to wrap each and every time, since there might be native code down the
330   // stack that has installed its own exception handlers.
331   os::os_exception_wrapper(call_helper, result, method, args, THREAD);
332 }
333 
334 void JavaCalls::call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
335 
336   JavaThread* thread = THREAD;
337   assert(method.not_null(), "must have a method to call");
338   assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
339   assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
340 
341   // Verify the arguments
342   if (JVMCI_ONLY(args->alternative_target().is_null() &&) (DEBUG_ONLY(true ||) CheckJNICalls)) {
343     args->verify(method, result->get_type());
344   }
345   // Ignore call if method is empty
346   if (JVMCI_ONLY(args->alternative_target().is_null() &&) method->is_empty_method()) {
347     assert(result->get_type() == T_VOID, "an empty method must return a void value");
348     return;
349   }
350 
351 #ifdef ASSERT
352   { InstanceKlass* holder = method->method_holder();
353     // A klass might not be initialized since JavaCall's might be used during the executing of
354     // the <clinit>. For example, a Thread.start might start executing on an object that is
355     // not fully initialized! (bad Java programming style)
356     assert(holder->is_linked(), "rewriting must have taken place");
357   }
358 #endif
359 
360   CompilationPolicy::compile_if_required(method, CHECK);
361 
362   // Since the call stub sets up like the interpreter we call the from_interpreted_entry
363   // so we can go compiled via a i2c. Otherwise initial entry method will always
364   // run interpreted.
365   address entry_point = method->from_interpreted_entry();
366   if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
367     entry_point = method->interpreter_entry();
368   }
369 
370   // Figure out if the result value is an oop or not (Note: This is a different value
371   // than result_type. result_type will be T_INT of oops. (it is about size)
372   BasicType result_type = runtime_type_from(result);
373   bool oop_result_flag = is_reference_type(result->get_type());
374 
375   // Find receiver
376   Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
377 
378   // When we reenter Java, we need to re-enable the reserved/yellow zone which
379   // might already be disabled when we are in VM.
380   thread->stack_overflow_state()->reguard_stack_if_needed();
381 
382   // Check that there are shadow pages available before changing thread state
383   // to Java. Calculate current_stack_pointer here to make sure
384   // stack_shadow_pages_available() and map_stack_shadow_pages() use the same sp.
385   address sp = os::current_stack_pointer();
386   if (!os::stack_shadow_pages_available(THREAD, method, sp)) {
387     // Throw stack overflow exception with preinitialized exception.
388     Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method);
389     return;
390   } else {
391     // Touch pages checked if the OS needs them to be touched to be mapped.
392     os::map_stack_shadow_pages(sp);
393   }
394 
395   jobject value_buffer = nullptr;
396   if (InlineTypeReturnedAsFields && (result->get_type() == T_OBJECT)) {
397     // Pre allocate a buffered inline type in case the result is returned
398     // flattened by compiled code
399     InlineKlass* vk = method->returns_inline_type(thread);
400     if (vk != nullptr && vk->can_be_returned_as_fields()) {
401       oop instance = vk->allocate_instance(CHECK);
402       value_buffer = JNIHandles::make_local(thread, instance);
403       result->set_jobject(value_buffer);
404     }
405   }
406 
407   // do call
408   { JavaCallWrapper link(method, receiver, result, CHECK);
409     { HandleMark hm(thread);  // HandleMark used by HandleMarkCleaner
410 
411       // NOTE: if we move the computation of the result_val_address inside
412       // the call to call_stub, the optimizer produces wrong code.
413       intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
414       intptr_t* parameter_address = args->parameters();
415 #if INCLUDE_JVMCI
416       // Gets the alternative target (if any) that should be called
417       Handle alternative_target = args->alternative_target();
418       if (!alternative_target.is_null()) {
419         // Must extract verified entry point from HotSpotNmethod after VM to Java
420         // transition in JavaCallWrapper constructor so that it is safe with
421         // respect to nmethod sweeping.
422         address verified_entry_point = (address) HotSpotJVMCI::InstalledCode::entryPoint(nullptr, alternative_target());
423         if (verified_entry_point != nullptr) {
424           thread->set_jvmci_alternate_call_target(verified_entry_point);
425           entry_point = method->adapter()->get_i2c_entry();
426         }
427       }
428 #endif
429       StubRoutines::call_stub()(
430         (address)&link,
431         // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
432         result_val_address,          // see NOTE above (compiler problem)
433         result_type,
434         method(),
435         entry_point,
436         parameter_address,
437         args->size_of_parameters(),
438         CHECK
439       );
440 
441       result = link.result();  // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
442       // Preserve oop return value across possible gc points
443       if (oop_result_flag) {
444         thread->set_vm_result(result->get_oop());
445       }
446     }
447   } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
448 
449   // Check if a thread stop or suspend should be executed
450   // The following assert was not realistic.  Thread.stop can set that bit at any moment.
451   //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
452 
453   // Restore possible oop return
454   if (oop_result_flag) {
455     result->set_oop(thread->vm_result());
456     thread->set_vm_result(nullptr);
457     JNIHandles::destroy_local(value_buffer);
458   }
459 }
460 
461 
462 //--------------------------------------------------------------------------------------
463 // Implementation of JavaCallArguments
464 
465 inline bool is_value_state_indirect_oop(uint state) {
466   assert(state != JavaCallArguments::value_state_oop,
467          "Checking for handles after removal");
468   assert(state < JavaCallArguments::value_state_limit,
469          "Invalid value state %u", state);
470   return state != JavaCallArguments::value_state_primitive;
471 }
472 
473 inline oop resolve_indirect_oop(intptr_t value, uint state) {
474   switch (state) {
475   case JavaCallArguments::value_state_handle:
476   {
477     oop* ptr = reinterpret_cast<oop*>(value);
478     return Handle::raw_resolve(ptr);
479   }
480 
481   case JavaCallArguments::value_state_jobject:
482   {
483     jobject obj = reinterpret_cast<jobject>(value);
484     return JNIHandles::resolve(obj);
485   }
486 
487   default:
488     ShouldNotReachHere();
489     return nullptr;
490   }
491 }
492 
493 intptr_t* JavaCallArguments::parameters() {
494   // First convert all handles to oops
495   for(int i = 0; i < _size; i++) {
496     uint state = _value_state[i];
497     assert(state != value_state_oop, "Multiple handle conversions");
498     if (is_value_state_indirect_oop(state)) {
499       oop obj = resolve_indirect_oop(_value[i], state);
500       _value[i] = cast_from_oop<intptr_t>(obj);
501       _value_state[i] = value_state_oop;
502     }
503   }
504   // Return argument vector
505   return _value;
506 }
507 
508 
509 class SignatureChekker : public SignatureIterator {
510  private:
511    int _pos;
512    BasicType _return_type;
513    u_char* _value_state;
514    intptr_t* _value;
515 
516  public:
517   SignatureChekker(Symbol* signature,
518                    BasicType return_type,
519                    bool is_static,
520                    u_char* value_state,
521                    intptr_t* value) :
522     SignatureIterator(signature),
523     _pos(0),
524     _return_type(return_type),
525     _value_state(value_state),
526     _value(value)
527   {
528     if (!is_static) {
529       check_value(true); // Receiver must be an oop
530     }
531     do_parameters_on(this);
532     check_return_type(return_type);
533   }
534 
535  private:
536   void check_value(bool is_reference) {
537     uint state = _value_state[_pos++];
538     if (is_reference) {
539       guarantee(is_value_state_indirect_oop(state),
540                 "signature does not match pushed arguments: %u at %d",
541                 state, _pos - 1);
542     } else {
543       guarantee(state == JavaCallArguments::value_state_primitive,
544                 "signature does not match pushed arguments: %u at %d",
545                 state, _pos - 1);
546     }
547   }
548 
549   void check_return_type(BasicType t) {
550     guarantee(t == _return_type, "return type does not match");
551   }
552 
553   void check_single_word() {
554     check_value(false);
555   }
556 
557   void check_double_word() {
558     check_value(false);
559     check_value(false);
560   }
561 
562   void check_reference() {
563     intptr_t v = _value[_pos];
564     if (v != 0) {
565       // v is a "handle" referring to an oop, cast to integral type.
566       // There shouldn't be any handles in very low memory.
567       guarantee((size_t)v >= os::vm_page_size(),
568                 "Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
569       // Verify the pointee.
570       oop vv = resolve_indirect_oop(v, _value_state[_pos]);
571       guarantee(oopDesc::is_oop_or_null(vv, true),
572                 "Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
573                 _pos, v, p2i(vv));
574     }
575 
576     check_value(true);          // Verify value state.
577   }
578 
579   friend class SignatureIterator;  // so do_parameters_on can call do_type
580   void do_type(BasicType type) {
581     switch (type) {
582     case T_BYTE:
583     case T_BOOLEAN:
584     case T_CHAR:
585     case T_SHORT:
586     case T_INT:
587     case T_FLOAT:  // this one also
588       check_single_word(); break;
589     case T_LONG:
590     case T_DOUBLE:
591       check_double_word(); break;
592     case T_ARRAY:
593     case T_OBJECT:
594       check_reference(); break;
595     default:
596       ShouldNotReachHere();
597     }
598   }
599 };
600 
601 
602 void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
603   guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
604 
605   // Treat T_OBJECT and T_ARRAY as the same
606   if (return_type == T_ARRAY) return_type = T_OBJECT;
607 
608   // Check that oop information is correct
609   Symbol* signature = method->signature();
610 
611   SignatureChekker sc(signature,
612                       return_type,
613                       method->is_static(),
614                       _value_state,
615                       _value);
616 }