1 /*
  2  * Copyright (c) 1997, 2022, 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 #if INCLUDE_JVMCI
 34 #include "jvmci/jvmciJavaClasses.hpp"
 35 #endif
 36 #include "memory/universe.hpp"
 37 #include "oops/method.inline.hpp"
 38 #include "oops/oop.inline.hpp"
 39 #include "oops/inlineKlass.hpp"
 40 #include "prims/jniCheck.hpp"
 41 #include "prims/jvmtiExport.hpp"
 42 #include "runtime/handles.inline.hpp"
 43 #include "runtime/interfaceSupport.inline.hpp"
 44 #include "runtime/javaCalls.hpp"
 45 #include "runtime/javaThread.hpp"
 46 #include "runtime/jniHandles.inline.hpp"
 47 #include "runtime/mutexLocker.hpp"
 48 #include "runtime/os.inline.hpp"
 49 #include "runtime/sharedRuntime.hpp"
 50 #include "runtime/signature.hpp"
 51 #include "runtime/stubRoutines.hpp"
 52 #include "runtime/thread.inline.hpp"
 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 == NULL 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   assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
100 
101   MACOS_AARCH64_ONLY(_thread->enable_wx(WXExec));
102 }
103 
104 
105 JavaCallWrapper::~JavaCallWrapper() {
106   assert(_thread == JavaThread::current(), "must still be the same thread");
107 
108   MACOS_AARCH64_ONLY(_thread->enable_wx(WXWrite));
109 
110   // restore previous handle block & Java frame linkage
111   JNIHandleBlock *_old_handles = _thread->active_handles();
112   _thread->set_active_handles(_handles);
113 
114   _thread->frame_anchor()->zap();
115 
116   debug_only(_thread->dec_java_call_counter());
117 
118   // Old thread-local info. has been restored. We are not back in the VM.
119   ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
120 
121   // State has been restored now make the anchor frame visible for the profiler.
122   // Do this after the transition because this allows us to put an assert
123   // the Java->vm transition which checks to see that stack is not walkable
124   // on sparc/ia64 which will catch violations of the resetting of last_Java_frame
125   // invariants (i.e. _flags always cleared on return to Java)
126 
127   _thread->frame_anchor()->copy(&_anchor);
128 
129   // Release handles after we are marked as being inside the VM again, since this
130   // operation might block
131   JNIHandleBlock::release_block(_old_handles, _thread);
132 
133   if (_thread->has_pending_exception() && _thread->has_last_Java_frame()) {
134     // If we get here, the Java code threw an exception that unwound a frame.
135     // It could be that the new frame anchor has not passed through the required
136     // StackWatermark barriers. Therefore, we process any such deferred unwind
137     // requests here.
138     StackWatermarkSet::after_unwind(_thread);
139   }
140 }
141 
142 
143 void JavaCallWrapper::oops_do(OopClosure* f) {
144   f->do_oop((oop*)&_receiver);
145   handles()->oops_do(f);
146 }
147 
148 
149 // Helper methods
150 static BasicType runtime_type_from(JavaValue* result) {
151   switch (result->get_type()) {
152     case T_BOOLEAN  : // fall through
153     case T_CHAR     : // fall through
154     case T_SHORT    : // fall through
155     case T_INT      : // fall through
156 #ifndef _LP64
157     case T_OBJECT   : // fall through
158     case T_ARRAY    : // fall through
159     case T_PRIMITIVE_OBJECT: // fall through
160 #endif
161     case T_BYTE     : // fall through
162     case T_VOID     : return T_INT;
163     case T_LONG     : return T_LONG;
164     case T_FLOAT    : return T_FLOAT;
165     case T_DOUBLE   : return T_DOUBLE;
166 #ifdef _LP64
167     case T_ARRAY    : // fall through
168     case T_OBJECT   : return T_OBJECT;
169     case T_PRIMITIVE_OBJECT: return T_PRIMITIVE_OBJECT;
170 #endif
171     default:
172       ShouldNotReachHere();
173       return T_ILLEGAL;
174   }
175 }
176 
177 // ============ Virtual calls ============
178 
179 void JavaCalls::call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
180   CallInfo callinfo;
181   Handle receiver = args->receiver();
182   Klass* recvrKlass = receiver.is_null() ? (Klass*)NULL : receiver->klass();
183   LinkInfo link_info(spec_klass, name, signature);
184   LinkResolver::resolve_virtual_call(
185           callinfo, receiver, recvrKlass, link_info, true, CHECK);
186   methodHandle method(THREAD, callinfo.selected_method());
187   assert(method.not_null(), "should have thrown exception");
188 
189   // Invoke the method
190   JavaCalls::call(result, method, args, CHECK);
191 }
192 
193 
194 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, TRAPS) {
195   JavaCallArguments args(receiver);
196   call_virtual(result, spec_klass, name, signature, &args, CHECK);
197 }
198 
199 
200 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
201   JavaCallArguments args(receiver);
202   args.push_oop(arg1);
203   call_virtual(result, spec_klass, name, signature, &args, CHECK);
204 }
205 
206 
207 
208 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
209   JavaCallArguments args(receiver);
210   args.push_oop(arg1);
211   args.push_oop(arg2);
212   call_virtual(result, spec_klass, name, signature, &args, CHECK);
213 }
214 
215 
216 // ============ Special calls ============
217 
218 void JavaCalls::call_special(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
219   CallInfo callinfo;
220   LinkInfo link_info(klass, name, signature);
221   LinkResolver::resolve_special_call(callinfo, args->receiver(), link_info, CHECK);
222   methodHandle method(THREAD, callinfo.selected_method());
223   assert(method.not_null(), "should have thrown exception");
224 
225   // Invoke the method
226   JavaCalls::call(result, method, args, CHECK);
227 }
228 
229 
230 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
231   JavaCallArguments args(receiver);
232   call_special(result, klass, name, signature, &args, CHECK);
233 }
234 
235 
236 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
237   JavaCallArguments args(receiver);
238   args.push_oop(arg1);
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, Handle arg2, TRAPS) {
244   JavaCallArguments args(receiver);
245   args.push_oop(arg1);
246   args.push_oop(arg2);
247   call_special(result, klass, name, signature, &args, CHECK);
248 }
249 
250 
251 // ============ Static calls ============
252 
253 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
254   CallInfo callinfo;
255   LinkInfo link_info(klass, name, signature);
256   LinkResolver::resolve_static_call(callinfo, link_info, true, CHECK);
257   methodHandle method(THREAD, callinfo.selected_method());
258   assert(method.not_null(), "should have thrown exception");
259 
260   // Invoke the method
261   JavaCalls::call(result, method, args, CHECK);
262 }
263 
264 
265 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
266   JavaCallArguments args;
267   call_static(result, klass, name, signature, &args, CHECK);
268 }
269 
270 
271 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
272   JavaCallArguments args(arg1);
273   call_static(result, klass, name, signature, &args, CHECK);
274 }
275 
276 
277 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
278   JavaCallArguments args;
279   args.push_oop(arg1);
280   args.push_oop(arg2);
281   call_static(result, klass, name, signature, &args, CHECK);
282 }
283 
284 
285 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS) {
286   JavaCallArguments args;
287   args.push_oop(arg1);
288   args.push_oop(arg2);
289   args.push_oop(arg3);
290   call_static(result, klass, name, signature, &args, CHECK);
291 }
292 
293 // ============ allocate and initialize new object instance ============
294 
295 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, JavaCallArguments* args, TRAPS) {
296   klass->initialize(CHECK_NH); // Quick no-op if already initialized.
297 
298   // Special case for factory methods
299   if (!constructor_signature->is_void_method_signature()) {
300     assert(klass->is_inline_klass(), "inline classes must use factory methods");
301     JavaValue factory_result(T_OBJECT);
302     JavaCalls::call_static(&factory_result, klass,
303                            vmSymbols::object_initializer_name(),
304                            constructor_signature, args, CHECK_NH);
305     return Handle(THREAD, factory_result.get_oop());
306   }
307 
308   // main branch of code creates a non-inline object:
309   assert(!klass->is_inline_klass(), "classic constructors are only for non-inline classes");
310   Handle obj = klass->allocate_instance_handle(CHECK_NH);
311   JavaValue void_result(T_VOID);
312   args->set_receiver(obj); // inserts <obj> as the first argument.
313   JavaCalls::call_special(&void_result, klass,
314                           vmSymbols::object_initializer_name(),
315                           constructor_signature, args, CHECK_NH);
316   // Already returned a Null Handle if any exception is pending.
317   return obj;
318 }
319 
320 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, TRAPS) {
321   JavaCallArguments args;
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, TRAPS) {
326   JavaCallArguments args;
327   args.push_oop(arg1);
328   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
329 }
330 
331 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, Handle arg2, TRAPS) {
332   JavaCallArguments args;
333   args.push_oop(arg1);
334   args.push_oop(arg2);
335   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
336 }
337 
338 // -------------------------------------------------
339 // Implementation of JavaCalls (low level)
340 
341 
342 void JavaCalls::call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
343   // Check if we need to wrap a potential OS exception handler around thread.
344   // This is used for e.g. Win32 structured exception handlers.
345   // Need to wrap each and every time, since there might be native code down the
346   // stack that has installed its own exception handlers.
347   os::os_exception_wrapper(call_helper, result, method, args, THREAD);
348 }
349 
350 void JavaCalls::call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
351 
352   JavaThread* thread = THREAD;
353   assert(method.not_null(), "must have a method to call");
354   assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
355   assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
356 
357   // Verify the arguments
358   if (JVMCI_ONLY(args->alternative_target().is_null() &&) (DEBUG_ONLY(true ||) CheckJNICalls)) {
359     args->verify(method, result->get_type());
360   }
361   // Ignore call if method is empty
362   if (JVMCI_ONLY(args->alternative_target().is_null() &&) method->is_empty_method()) {
363     assert(result->get_type() == T_VOID, "an empty method must return a void value");
364     return;
365   }
366 
367 #ifdef ASSERT
368   { InstanceKlass* holder = method->method_holder();
369     // A klass might not be initialized since JavaCall's might be used during the executing of
370     // the <clinit>. For example, a Thread.start might start executing on an object that is
371     // not fully initialized! (bad Java programming style)
372     assert(holder->is_linked(), "rewriting must have taken place");
373   }
374 #endif
375 
376   CompilationPolicy::compile_if_required(method, CHECK);
377 
378   // Since the call stub sets up like the interpreter we call the from_interpreted_entry
379   // so we can go compiled via a i2c. Otherwise initial entry method will always
380   // run interpreted.
381   address entry_point = method->from_interpreted_entry();
382   if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
383     entry_point = method->interpreter_entry();
384   }
385 
386   // Figure out if the result value is an oop or not (Note: This is a different value
387   // than result_type. result_type will be T_INT of oops. (it is about size)
388   BasicType result_type = runtime_type_from(result);
389   bool oop_result_flag = is_reference_type(result->get_type());
390 
391   // Find receiver
392   Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
393 
394   // When we reenter Java, we need to re-enable the reserved/yellow zone which
395   // might already be disabled when we are in VM.
396   thread->stack_overflow_state()->reguard_stack_if_needed();
397 
398   // Check that there are shadow pages available before changing thread state
399   // to Java. Calculate current_stack_pointer here to make sure
400   // stack_shadow_pages_available() and map_stack_shadow_pages() use the same sp.
401   address sp = os::current_stack_pointer();
402   if (!os::stack_shadow_pages_available(THREAD, method, sp)) {
403     // Throw stack overflow exception with preinitialized exception.
404     Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method);
405     return;
406   } else {
407     // Touch pages checked if the OS needs them to be touched to be mapped.
408     os::map_stack_shadow_pages(sp);
409   }
410 
411   jobject value_buffer = NULL;
412   if (InlineTypeReturnedAsFields && (result->get_type() == T_PRIMITIVE_OBJECT || result->get_type() == T_OBJECT)) {
413     // Pre allocate a buffered inline type in case the result is returned
414     // flattened by compiled code
415     InlineKlass* vk = method->returns_inline_type(thread);
416     if (vk != NULL && vk->can_be_returned_as_fields()) {
417       oop instance = vk->allocate_instance(CHECK);
418       value_buffer = JNIHandles::make_local(thread, instance);
419       result->set_jobject(value_buffer);
420     }
421   }
422 
423   // do call
424   { JavaCallWrapper link(method, receiver, result, CHECK);
425     { HandleMark hm(thread);  // HandleMark used by HandleMarkCleaner
426 
427       // NOTE: if we move the computation of the result_val_address inside
428       // the call to call_stub, the optimizer produces wrong code.
429       intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
430       intptr_t* parameter_address = args->parameters();
431 #if INCLUDE_JVMCI
432       // Gets the alternative target (if any) that should be called
433       Handle alternative_target = args->alternative_target();
434       if (!alternative_target.is_null()) {
435         // Must extract verified entry point from HotSpotNmethod after VM to Java
436         // transition in JavaCallWrapper constructor so that it is safe with
437         // respect to nmethod sweeping.
438         address verified_entry_point = (address) HotSpotJVMCI::InstalledCode::entryPoint(NULL, alternative_target());
439         if (verified_entry_point != NULL) {
440           thread->set_jvmci_alternate_call_target(verified_entry_point);
441           entry_point = method->adapter()->get_i2c_entry();
442         }
443       }
444 #endif
445       StubRoutines::call_stub()(
446         (address)&link,
447         // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
448         result_val_address,          // see NOTE above (compiler problem)
449         result_type,
450         method(),
451         entry_point,
452         parameter_address,
453         args->size_of_parameters(),
454         CHECK
455       );
456 
457       result = link.result();  // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
458       // Preserve oop return value across possible gc points
459       if (oop_result_flag) {
460         thread->set_vm_result(result->get_oop());
461       }
462     }
463   } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
464 
465   // Check if a thread stop or suspend should be executed
466   // The following assert was not realistic.  Thread.stop can set that bit at any moment.
467   //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
468 
469   // Restore possible oop return
470   if (oop_result_flag) {
471     result->set_oop(thread->vm_result());
472     thread->set_vm_result(NULL);
473     JNIHandles::destroy_local(value_buffer);
474   }
475 }
476 
477 
478 //--------------------------------------------------------------------------------------
479 // Implementation of JavaCallArguments
480 
481 inline bool is_value_state_indirect_oop(uint state) {
482   assert(state != JavaCallArguments::value_state_oop,
483          "Checking for handles after removal");
484   assert(state < JavaCallArguments::value_state_limit,
485          "Invalid value state %u", state);
486   return state != JavaCallArguments::value_state_primitive;
487 }
488 
489 inline oop resolve_indirect_oop(intptr_t value, uint state) {
490   switch (state) {
491   case JavaCallArguments::value_state_handle:
492   {
493     oop* ptr = reinterpret_cast<oop*>(value);
494     return Handle::raw_resolve(ptr);
495   }
496 
497   case JavaCallArguments::value_state_jobject:
498   {
499     jobject obj = reinterpret_cast<jobject>(value);
500     return JNIHandles::resolve(obj);
501   }
502 
503   default:
504     ShouldNotReachHere();
505     return NULL;
506   }
507 }
508 
509 intptr_t* JavaCallArguments::parameters() {
510   // First convert all handles to oops
511   for(int i = 0; i < _size; i++) {
512     uint state = _value_state[i];
513     assert(state != value_state_oop, "Multiple handle conversions");
514     if (is_value_state_indirect_oop(state)) {
515       oop obj = resolve_indirect_oop(_value[i], state);
516       _value[i] = cast_from_oop<intptr_t>(obj);
517       _value_state[i] = value_state_oop;
518     }
519   }
520   // Return argument vector
521   return _value;
522 }
523 
524 
525 class SignatureChekker : public SignatureIterator {
526  private:
527    int _pos;
528    BasicType _return_type;
529    u_char* _value_state;
530    intptr_t* _value;
531 
532  public:
533   SignatureChekker(Symbol* signature,
534                    BasicType return_type,
535                    bool is_static,
536                    u_char* value_state,
537                    intptr_t* value) :
538     SignatureIterator(signature),
539     _pos(0),
540     _return_type(return_type),
541     _value_state(value_state),
542     _value(value)
543   {
544     if (!is_static) {
545       check_value(true); // Receiver must be an oop
546     }
547     do_parameters_on(this);
548     check_return_type(return_type);
549   }
550 
551  private:
552   void check_value(bool is_reference) {
553     uint state = _value_state[_pos++];
554     if (is_reference) {
555       guarantee(is_value_state_indirect_oop(state),
556                 "signature does not match pushed arguments: %u at %d",
557                 state, _pos - 1);
558     } else {
559       guarantee(state == JavaCallArguments::value_state_primitive,
560                 "signature does not match pushed arguments: %u at %d",
561                 state, _pos - 1);
562     }
563   }
564 
565   void check_return_type(BasicType t) {
566     guarantee(t == _return_type, "return type does not match");
567   }
568 
569   void check_single_word() {
570     check_value(false);
571   }
572 
573   void check_double_word() {
574     check_value(false);
575     check_value(false);
576   }
577 
578   void check_reference() {
579     intptr_t v = _value[_pos];
580     if (v != 0) {
581       // v is a "handle" referring to an oop, cast to integral type.
582       // There shouldn't be any handles in very low memory.
583       guarantee((size_t)v >= (size_t)os::vm_page_size(),
584                 "Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
585       // Verify the pointee.
586       oop vv = resolve_indirect_oop(v, _value_state[_pos]);
587       guarantee(oopDesc::is_oop_or_null(vv, true),
588                 "Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
589                 _pos, v, p2i(vv));
590     }
591 
592     check_value(true);          // Verify value state.
593   }
594 
595   friend class SignatureIterator;  // so do_parameters_on can call do_type
596   void do_type(BasicType type) {
597     switch (type) {
598     case T_BYTE:
599     case T_BOOLEAN:
600     case T_CHAR:
601     case T_SHORT:
602     case T_INT:
603     case T_FLOAT:  // this one also
604       check_single_word(); break;
605     case T_LONG:
606     case T_DOUBLE:
607       check_double_word(); break;
608     case T_ARRAY:
609     case T_OBJECT:
610     case T_PRIMITIVE_OBJECT:
611       check_reference(); break;
612     default:
613       ShouldNotReachHere();
614     }
615   }
616 };
617 
618 
619 void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
620   guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
621 
622   // Treat T_OBJECT and T_ARRAY as the same
623   if (return_type == T_ARRAY) return_type = T_OBJECT;
624 
625   // Check that oop information is correct
626   Symbol* signature = method->signature();
627 
628   SignatureChekker sc(signature,
629                       return_type,
630                       method->is_static(),
631                       _value_state,
632                       _value);
633 }