1 /*
  2  * Copyright (c) 1997, 2021, 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/jniHandles.inline.hpp"
 46 #include "runtime/mutexLocker.hpp"
 47 #include "runtime/os.inline.hpp"
 48 #include "runtime/sharedRuntime.hpp"
 49 #include "runtime/signature.hpp"
 50 #include "runtime/stubRoutines.hpp"
 51 #include "runtime/thread.inline.hpp"
 52 
 53 // -----------------------------------------------------
 54 // Implementation of JavaCallWrapper
 55 
 56 JavaCallWrapper::JavaCallWrapper(const methodHandle& callee_method, Handle receiver, JavaValue* result, TRAPS) {
 57   JavaThread* thread = THREAD;
 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   // clear any pending exception in thread (native calls start with no exception pending)
 69   thread->clear_pending_exception();
 70 
 71   // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
 72   // info, since we cannot find oops before the new information is set up completely.
 73   ThreadStateTransition::transition_from_vm(thread, _thread_in_Java, true /* check_asyncs */);
 74 
 75   // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
 76   // the JavaCallWrapper before the entry frame is on the stack.
 77   _callee_method = callee_method();
 78   _receiver = receiver();
 79 
 80 #ifdef CHECK_UNHANDLED_OOPS
 81   THREAD->allow_unhandled_oop(&_receiver);
 82 #endif // CHECK_UNHANDLED_OOPS
 83 
 84   _thread       = thread;
 85   _handles      = _thread->active_handles();    // save previous handle block & Java frame linkage
 86 
 87   // For the profiler, the last_Java_frame information in thread must always be in
 88   // legal state. We have no last Java frame if last_Java_sp == NULL so
 89   // the valid transition is to clear _last_Java_sp and then reset the rest of
 90   // the (platform specific) state.
 91 
 92   _anchor.copy(_thread->frame_anchor());
 93   _thread->frame_anchor()->clear();
 94 
 95   debug_only(_thread->inc_java_call_counter());
 96   _thread->set_active_handles(new_handles);     // install new handle block and reset Java frame linkage
 97 
 98   assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
 99 
100   MACOS_AARCH64_ONLY(_thread->enable_wx(WXExec));
101 }
102 
103 
104 JavaCallWrapper::~JavaCallWrapper() {
105   assert(_thread == JavaThread::current(), "must still be the same thread");
106 
107   MACOS_AARCH64_ONLY(_thread->enable_wx(WXWrite));
108 
109   // restore previous handle block & Java frame linkage
110   JNIHandleBlock *_old_handles = _thread->active_handles();
111   _thread->set_active_handles(_handles);
112 
113   _thread->frame_anchor()->zap();
114 
115   debug_only(_thread->dec_java_call_counter());
116 
117   // Old thread-local info. has been restored. We are not back in the VM.
118   ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
119 
120   // State has been restored now make the anchor frame visible for the profiler.
121   // Do this after the transition because this allows us to put an assert
122   // the Java->vm transition which checks to see that stack is not walkable
123   // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
124   // invariants (i.e. _flags always cleared on return to Java)
125 
126   _thread->frame_anchor()->copy(&_anchor);
127 
128   // Release handles after we are marked as being inside the VM again, since this
129   // operation might block
130   JNIHandleBlock::release_block(_old_handles, _thread);
131 
132   if (_thread->has_pending_exception() && _thread->has_last_Java_frame()) {
133     // If we get here, the Java code threw an exception that unwound a frame.
134     // It could be that the new frame anchor has not passed through the required
135     // StackWatermark barriers. Therefore, we process any such deferred unwind
136     // requests here.
137     StackWatermarkSet::after_unwind(_thread);
138   }
139 }
140 
141 
142 void JavaCallWrapper::oops_do(OopClosure* f) {
143   f->do_oop((oop*)&_receiver);
144   handles()->oops_do(f);
145 }
146 
147 
148 // Helper methods
149 static BasicType runtime_type_from(JavaValue* result) {
150   switch (result->get_type()) {
151     case T_BOOLEAN  : // fall through
152     case T_CHAR     : // fall through
153     case T_SHORT    : // fall through
154     case T_INT      : // fall through
155 #ifndef _LP64
156     case T_OBJECT   : // fall through
157     case T_ARRAY    : // fall through
158     case T_INLINE_TYPE: // fall through
159 #endif
160     case T_BYTE     : // fall through
161     case T_VOID     : return T_INT;
162     case T_LONG     : return T_LONG;
163     case T_FLOAT    : return T_FLOAT;
164     case T_DOUBLE   : return T_DOUBLE;
165 #ifdef _LP64
166     case T_ARRAY    : // fall through
167     case T_OBJECT   : return T_OBJECT;
168     case T_INLINE_TYPE: return T_INLINE_TYPE;
169 #endif
170     default:
171       ShouldNotReachHere();
172       return T_ILLEGAL;
173   }
174 }
175 
176 // ============ Virtual calls ============
177 
178 void JavaCalls::call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
179   CallInfo callinfo;
180   Handle receiver = args->receiver();
181   Klass* recvrKlass = receiver.is_null() ? (Klass*)NULL : receiver->klass();
182   LinkInfo link_info(spec_klass, name, signature);
183   LinkResolver::resolve_virtual_call(
184           callinfo, receiver, recvrKlass, link_info, true, CHECK);
185   methodHandle method(THREAD, callinfo.selected_method());
186   assert(method.not_null(), "should have thrown exception");
187 
188   // Invoke the method
189   JavaCalls::call(result, method, args, CHECK);
190 }
191 
192 
193 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, TRAPS) {
194   JavaCallArguments args(receiver);
195   call_virtual(result, spec_klass, name, signature, &args, CHECK);
196 }
197 
198 
199 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
200   JavaCallArguments args(receiver);
201   args.push_oop(arg1);
202   call_virtual(result, spec_klass, name, signature, &args, CHECK);
203 }
204 
205 
206 
207 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
208   JavaCallArguments args(receiver);
209   args.push_oop(arg1);
210   args.push_oop(arg2);
211   call_virtual(result, spec_klass, name, signature, &args, CHECK);
212 }
213 
214 
215 // ============ Special calls ============
216 
217 void JavaCalls::call_special(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
218   CallInfo callinfo;
219   LinkInfo link_info(klass, name, signature);
220   LinkResolver::resolve_special_call(callinfo, args->receiver(), link_info, CHECK);
221   methodHandle method(THREAD, callinfo.selected_method());
222   assert(method.not_null(), "should have thrown exception");
223 
224   // Invoke the method
225   JavaCalls::call(result, method, args, CHECK);
226 }
227 
228 
229 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
230   JavaCallArguments args(receiver);
231   call_special(result, klass, name, signature, &args, CHECK);
232 }
233 
234 
235 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
236   JavaCallArguments args(receiver);
237   args.push_oop(arg1);
238   call_special(result, klass, name, signature, &args, CHECK);
239 }
240 
241 
242 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
243   JavaCallArguments args(receiver);
244   args.push_oop(arg1);
245   args.push_oop(arg2);
246   call_special(result, klass, name, signature, &args, CHECK);
247 }
248 
249 
250 // ============ Static calls ============
251 
252 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
253   CallInfo callinfo;
254   LinkInfo link_info(klass, name, signature);
255   LinkResolver::resolve_static_call(callinfo, link_info, true, CHECK);
256   methodHandle method(THREAD, callinfo.selected_method());
257   assert(method.not_null(), "should have thrown exception");
258 
259   // Invoke the method
260   JavaCalls::call(result, method, args, CHECK);
261 }
262 
263 
264 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
265   JavaCallArguments args;
266   call_static(result, klass, name, signature, &args, CHECK);
267 }
268 
269 
270 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
271   JavaCallArguments args(arg1);
272   call_static(result, klass, name, signature, &args, CHECK);
273 }
274 
275 
276 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
277   JavaCallArguments args;
278   args.push_oop(arg1);
279   args.push_oop(arg2);
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, Handle arg3, TRAPS) {
285   JavaCallArguments args;
286   args.push_oop(arg1);
287   args.push_oop(arg2);
288   args.push_oop(arg3);
289   call_static(result, klass, name, signature, &args, CHECK);
290 }
291 
292 // ============ allocate and initialize new object instance ============
293 
294 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, JavaCallArguments* args, TRAPS) {
295   klass->initialize(CHECK_NH); // Quick no-op if already initialized.
296 
297   // Special case for factory methods
298   if (!constructor_signature->is_void_method_signature()) {
299     assert(klass->is_inline_klass(), "inline classes must use factory methods");
300     JavaValue factory_result(T_OBJECT);
301     JavaCalls::call_static(&factory_result, klass,
302                            vmSymbols::object_initializer_name(),
303                            constructor_signature, args, CHECK_NH);
304     return Handle(THREAD, factory_result.get_oop());
305   }
306 
307   // main branch of code creates a non-inline object:
308   assert(!klass->is_inline_klass(), "classic constructors are only for non-inline classes");
309   Handle obj = klass->allocate_instance_handle(CHECK_NH);
310   JavaValue void_result(T_VOID);
311   args->set_receiver(obj); // inserts <obj> as the first argument.
312   JavaCalls::call_special(&void_result, klass,
313                           vmSymbols::object_initializer_name(),
314                           constructor_signature, args, CHECK_NH);
315   // Already returned a Null Handle if any exception is pending.
316   return obj;
317 }
318 
319 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, TRAPS) {
320   JavaCallArguments args;
321   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
322 }
323 
324 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, TRAPS) {
325   JavaCallArguments args;
326   args.push_oop(arg1);
327   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
328 }
329 
330 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, Handle arg2, TRAPS) {
331   JavaCallArguments args;
332   args.push_oop(arg1);
333   args.push_oop(arg2);
334   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
335 }
336 
337 // -------------------------------------------------
338 // Implementation of JavaCalls (low level)
339 
340 
341 void JavaCalls::call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
342   // Check if we need to wrap a potential OS exception handler around thread.
343   // This is used for e.g. Win32 structured exception handlers.
344   // Need to wrap each and every time, since there might be native code down the
345   // stack that has installed its own exception handlers.
346   os::os_exception_wrapper(call_helper, result, method, args, THREAD);
347 }
348 
349 void JavaCalls::call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
350 
351   JavaThread* thread = THREAD;
352   assert(method.not_null(), "must have a method to call");
353   assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
354   assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
355 
356   // Verify the arguments
357   if (JVMCI_ONLY(args->alternative_target().is_null() &&) (DEBUG_ONLY(true ||) CheckJNICalls)) {
358     args->verify(method, result->get_type());
359   }
360   // Ignore call if method is empty
361   if (JVMCI_ONLY(args->alternative_target().is_null() &&) method->is_empty_method()) {
362     assert(result->get_type() == T_VOID, "an empty method must return a void value");
363     return;
364   }
365 
366 #ifdef ASSERT
367   { InstanceKlass* holder = method->method_holder();
368     // A klass might not be initialized since JavaCall's might be used during the executing of
369     // the <clinit>. For example, a Thread.start might start executing on an object that is
370     // not fully initialized! (bad Java programming style)
371     assert(holder->is_linked(), "rewriting must have taken place");
372   }
373 #endif
374 
375   CompilationPolicy::compile_if_required(method, CHECK);
376 
377   // Since the call stub sets up like the interpreter we call the from_interpreted_entry
378   // so we can go compiled via a i2c. Otherwise initial entry method will always
379   // run interpreted.
380   address entry_point = method->from_interpreted_entry();
381   if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
382     entry_point = method->interpreter_entry();
383   }
384 
385   // Figure out if the result value is an oop or not (Note: This is a different value
386   // than result_type. result_type will be T_INT of oops. (it is about size)
387   BasicType result_type = runtime_type_from(result);
388   bool oop_result_flag = is_reference_type(result->get_type());
389 
390   // Find receiver
391   Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
392 
393   // When we reenter Java, we need to reenable the reserved/yellow zone which
394   // might already be disabled when we are in VM.
395   thread->stack_overflow_state()->reguard_stack_if_needed();
396 
397   // Check that there are shadow pages available before changing thread state
398   // to Java. Calculate current_stack_pointer here to make sure
399   // stack_shadow_pages_available() and bang_stack_shadow_pages() use the same sp.
400   address sp = os::current_stack_pointer();
401   if (!os::stack_shadow_pages_available(THREAD, method, sp)) {
402     // Throw stack overflow exception with preinitialized exception.
403     Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method);
404     return;
405   } else {
406     // Touch pages checked if the OS needs them to be touched to be mapped.
407     os::map_stack_shadow_pages(sp);
408   }
409 
410   jobject value_buffer = NULL;
411   if (InlineTypeReturnedAsFields && result->get_type() == T_INLINE_TYPE) {
412     // Pre allocate a buffered inline type in case the result is returned
413     // flattened by compiled code
414     InlineKlass* vk = method->returned_inline_type(thread);
415     if (vk->can_be_returned_as_fields()) {
416       oop instance = vk->allocate_instance(CHECK);
417       value_buffer = JNIHandles::make_local(thread, instance);
418       result->set_jobject(value_buffer);
419     }
420   }
421 
422   // do call
423   { JavaCallWrapper link(method, receiver, result, CHECK);
424     { HandleMark hm(thread);  // HandleMark used by HandleMarkCleaner
425 
426       // NOTE: if we move the computation of the result_val_address inside
427       // the call to call_stub, the optimizer produces wrong code.
428       intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
429       intptr_t* parameter_address = args->parameters();
430 #if INCLUDE_JVMCI
431       // Gets the alternative target (if any) that should be called
432       Handle alternative_target = args->alternative_target();
433       if (!alternative_target.is_null()) {
434         // Must extract verified entry point from HotSpotNmethod after VM to Java
435         // transition in JavaCallWrapper constructor so that it is safe with
436         // respect to nmethod sweeping.
437         address verified_entry_point = (address) HotSpotJVMCI::InstalledCode::entryPoint(NULL, alternative_target());
438         if (verified_entry_point != NULL) {
439           thread->set_jvmci_alternate_call_target(verified_entry_point);
440           entry_point = method->adapter()->get_i2c_entry();
441         }
442       }
443 #endif
444       StubRoutines::call_stub()(
445         (address)&link,
446         // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
447         result_val_address,          // see NOTE above (compiler problem)
448         result_type,
449         method(),
450         entry_point,
451         parameter_address,
452         args->size_of_parameters(),
453         CHECK
454       );
455 
456       result = link.result();  // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
457       // Preserve oop return value across possible gc points
458       if (oop_result_flag) {
459         thread->set_vm_result(result->get_oop());
460       }
461     }
462   } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
463 
464   // Check if a thread stop or suspend should be executed
465   // The following assert was not realistic.  Thread.stop can set that bit at any moment.
466   //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
467 
468   // Restore possible oop return
469   if (oop_result_flag) {
470     result->set_oop(thread->vm_result());
471     thread->set_vm_result(NULL);
472     JNIHandles::destroy_local(value_buffer);
473   }
474 }
475 
476 
477 //--------------------------------------------------------------------------------------
478 // Implementation of JavaCallArguments
479 
480 inline bool is_value_state_indirect_oop(uint state) {
481   assert(state != JavaCallArguments::value_state_oop,
482          "Checking for handles after removal");
483   assert(state < JavaCallArguments::value_state_limit,
484          "Invalid value state %u", state);
485   return state != JavaCallArguments::value_state_primitive;
486 }
487 
488 inline oop resolve_indirect_oop(intptr_t value, uint state) {
489   switch (state) {
490   case JavaCallArguments::value_state_handle:
491   {
492     oop* ptr = reinterpret_cast<oop*>(value);
493     return Handle::raw_resolve(ptr);
494   }
495 
496   case JavaCallArguments::value_state_jobject:
497   {
498     jobject obj = reinterpret_cast<jobject>(value);
499     return JNIHandles::resolve(obj);
500   }
501 
502   default:
503     ShouldNotReachHere();
504     return NULL;
505   }
506 }
507 
508 intptr_t* JavaCallArguments::parameters() {
509   // First convert all handles to oops
510   for(int i = 0; i < _size; i++) {
511     uint state = _value_state[i];
512     assert(state != value_state_oop, "Multiple handle conversions");
513     if (is_value_state_indirect_oop(state)) {
514       oop obj = resolve_indirect_oop(_value[i], state);
515       _value[i] = cast_from_oop<intptr_t>(obj);
516       _value_state[i] = value_state_oop;
517     }
518   }
519   // Return argument vector
520   return _value;
521 }
522 
523 
524 class SignatureChekker : public SignatureIterator {
525  private:
526    int _pos;
527    BasicType _return_type;
528    u_char* _value_state;
529    intptr_t* _value;
530 
531  public:
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   {
543     if (!is_static) {
544       check_value(true); // Receiver must be an oop
545     }
546     do_parameters_on(this);
547     check_return_type(return_type);
548   }
549 
550  private:
551   void check_value(bool is_reference) {
552     uint state = _value_state[_pos++];
553     if (is_reference) {
554       guarantee(is_value_state_indirect_oop(state),
555                 "signature does not match pushed arguments: %u at %d",
556                 state, _pos - 1);
557     } else {
558       guarantee(state == JavaCallArguments::value_state_primitive,
559                 "signature does not match pushed arguments: %u at %d",
560                 state, _pos - 1);
561     }
562   }
563 
564   void check_return_type(BasicType t) {
565     guarantee(t == _return_type, "return type does not match");
566   }
567 
568   void check_single_word() {
569     check_value(false);
570   }
571 
572   void check_double_word() {
573     check_value(false);
574     check_value(false);
575   }
576 
577   void check_reference() {
578     intptr_t v = _value[_pos];
579     if (v != 0) {
580       // v is a "handle" referring to an oop, cast to integral type.
581       // There shouldn't be any handles in very low memory.
582       guarantee((size_t)v >= (size_t)os::vm_page_size(),
583                 "Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
584       // Verify the pointee.
585       oop vv = resolve_indirect_oop(v, _value_state[_pos]);
586       guarantee(oopDesc::is_oop_or_null(vv, true),
587                 "Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
588                 _pos, v, p2i(vv));
589     }
590 
591     check_value(true);          // Verify value state.
592   }
593 
594   friend class SignatureIterator;  // so do_parameters_on can call do_type
595   void do_type(BasicType type) {
596     switch (type) {
597     case T_BYTE:
598     case T_BOOLEAN:
599     case T_CHAR:
600     case T_SHORT:
601     case T_INT:
602     case T_FLOAT:  // this one also
603       check_single_word(); break;
604     case T_LONG:
605     case T_DOUBLE:
606       check_double_word(); break;
607     case T_ARRAY:
608     case T_OBJECT:
609     case T_INLINE_TYPE:
610       check_reference(); break;
611     default:
612       ShouldNotReachHere();
613     }
614   }
615 };
616 
617 
618 void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
619   guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
620 
621   // Treat T_OBJECT and T_ARRAY as the same
622   if (return_type == T_ARRAY) return_type = T_OBJECT;
623 
624   // Check that oop information is correct
625   Symbol* signature = method->signature();
626 
627   SignatureChekker sc(signature,
628                       return_type,
629                       method->is_static(),
630                       _value_state,
631                       _value);
632 }