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 "prims/jniCheck.hpp"
 40 #include "prims/jvmtiExport.hpp"
 41 #include "runtime/handles.inline.hpp"
 42 #include "runtime/interfaceSupport.inline.hpp"
 43 #include "runtime/javaCalls.hpp"
 44 #include "runtime/javaThread.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 resetting 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 #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*)NULL : 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   // do call
396   { JavaCallWrapper link(method, receiver, result, CHECK);
397     { HandleMark hm(thread);  // HandleMark used by HandleMarkCleaner
398 
399       // NOTE: if we move the computation of the result_val_address inside
400       // the call to call_stub, the optimizer produces wrong code.
401       intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
402       intptr_t* parameter_address = args->parameters();
403 #if INCLUDE_JVMCI
404       // Gets the alternative target (if any) that should be called
405       Handle alternative_target = args->alternative_target();
406       if (!alternative_target.is_null()) {
407         // Must extract verified entry point from HotSpotNmethod after VM to Java
408         // transition in JavaCallWrapper constructor so that it is safe with
409         // respect to nmethod sweeping.
410         address verified_entry_point = (address) HotSpotJVMCI::InstalledCode::entryPoint(NULL, alternative_target());
411         if (verified_entry_point != NULL) {
412           thread->set_jvmci_alternate_call_target(verified_entry_point);
413           entry_point = method->adapter()->get_i2c_entry();
414         }
415       }
416 #endif
417       StubRoutines::call_stub()(
418         (address)&link,
419         // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
420         result_val_address,          // see NOTE above (compiler problem)
421         result_type,
422         method(),
423         entry_point,
424         parameter_address,
425         args->size_of_parameters(),
426         CHECK
427       );
428 
429       result = link.result();  // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
430       // Preserve oop return value across possible gc points
431       if (oop_result_flag) {
432         thread->set_vm_result(result->get_oop());
433       }
434     }
435   } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
436 
437   // Check if a thread stop or suspend should be executed
438   // The following assert was not realistic.  Thread.stop can set that bit at any moment.
439   //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
440 
441   // Restore possible oop return
442   if (oop_result_flag) {
443     result->set_oop(thread->vm_result());
444     thread->set_vm_result(NULL);
445   }
446 }
447 
448 
449 //--------------------------------------------------------------------------------------
450 // Implementation of JavaCallArguments
451 
452 inline bool is_value_state_indirect_oop(uint state) {
453   assert(state != JavaCallArguments::value_state_oop,
454          "Checking for handles after removal");
455   assert(state < JavaCallArguments::value_state_limit,
456          "Invalid value state %u", state);
457   return state != JavaCallArguments::value_state_primitive;
458 }
459 
460 inline oop resolve_indirect_oop(intptr_t value, uint state) {
461   switch (state) {
462   case JavaCallArguments::value_state_handle:
463   {
464     oop* ptr = reinterpret_cast<oop*>(value);
465     return Handle::raw_resolve(ptr);
466   }
467 
468   case JavaCallArguments::value_state_jobject:
469   {
470     jobject obj = reinterpret_cast<jobject>(value);
471     return JNIHandles::resolve(obj);
472   }
473 
474   default:
475     ShouldNotReachHere();
476     return NULL;
477   }
478 }
479 
480 intptr_t* JavaCallArguments::parameters() {
481   // First convert all handles to oops
482   for(int i = 0; i < _size; i++) {
483     uint state = _value_state[i];
484     assert(state != value_state_oop, "Multiple handle conversions");
485     if (is_value_state_indirect_oop(state)) {
486       oop obj = resolve_indirect_oop(_value[i], state);
487       _value[i] = cast_from_oop<intptr_t>(obj);
488       _value_state[i] = value_state_oop;
489     }
490   }
491   // Return argument vector
492   return _value;
493 }
494 
495 
496 class SignatureChekker : public SignatureIterator {
497  private:
498    int _pos;
499    BasicType _return_type;
500    u_char* _value_state;
501    intptr_t* _value;
502 
503  public:
504   SignatureChekker(Symbol* signature,
505                    BasicType return_type,
506                    bool is_static,
507                    u_char* value_state,
508                    intptr_t* value) :
509     SignatureIterator(signature),
510     _pos(0),
511     _return_type(return_type),
512     _value_state(value_state),
513     _value(value)
514   {
515     if (!is_static) {
516       check_value(true); // Receiver must be an oop
517     }
518     do_parameters_on(this);
519     check_return_type(return_type);
520   }
521 
522  private:
523   void check_value(bool is_reference) {
524     uint state = _value_state[_pos++];
525     if (is_reference) {
526       guarantee(is_value_state_indirect_oop(state),
527                 "signature does not match pushed arguments: %u at %d",
528                 state, _pos - 1);
529     } else {
530       guarantee(state == JavaCallArguments::value_state_primitive,
531                 "signature does not match pushed arguments: %u at %d",
532                 state, _pos - 1);
533     }
534   }
535 
536   void check_return_type(BasicType t) {
537     guarantee(t == _return_type, "return type does not match");
538   }
539 
540   void check_single_word() {
541     check_value(false);
542   }
543 
544   void check_double_word() {
545     check_value(false);
546     check_value(false);
547   }
548 
549   void check_reference() {
550     intptr_t v = _value[_pos];
551     if (v != 0) {
552       // v is a "handle" referring to an oop, cast to integral type.
553       // There shouldn't be any handles in very low memory.
554       guarantee((size_t)v >= (size_t)os::vm_page_size(),
555                 "Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
556       // Verify the pointee.
557       oop vv = resolve_indirect_oop(v, _value_state[_pos]);
558       guarantee(oopDesc::is_oop_or_null(vv, true),
559                 "Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
560                 _pos, v, p2i(vv));
561     }
562 
563     check_value(true);          // Verify value state.
564   }
565 
566   friend class SignatureIterator;  // so do_parameters_on can call do_type
567   void do_type(BasicType type) {
568     switch (type) {
569     case T_BYTE:
570     case T_BOOLEAN:
571     case T_CHAR:
572     case T_SHORT:
573     case T_INT:
574     case T_FLOAT:  // this one also
575       check_single_word(); break;
576     case T_LONG:
577     case T_DOUBLE:
578       check_double_word(); break;
579     case T_ARRAY:
580     case T_OBJECT:
581       check_reference(); break;
582     default:
583       ShouldNotReachHere();
584     }
585   }
586 };
587 
588 
589 void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
590   guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
591 
592   // Treat T_OBJECT and T_ARRAY as the same
593   if (is_reference_type(return_type)) return_type = T_OBJECT;
594 
595   // Check that oop information is correct
596   Symbol* signature = method->signature();
597 
598   SignatureChekker sc(signature,
599                       return_type,
600                       method->is_static(),
601                       _value_state,
602                       _value);
603 }