1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "code/nmethod.hpp"
  29 #include "compiler/compileBroker.hpp"
  30 #include "interpreter/interpreter.hpp"
  31 #include "interpreter/linkResolver.hpp"
  32 #include "memory/universe.inline.hpp"
  33 #include "oops/oop.inline.hpp"
  34 #include "prims/jniCheck.hpp"
  35 #include "runtime/compilationPolicy.hpp"
  36 #include "runtime/handles.inline.hpp"
  37 #include "runtime/interfaceSupport.hpp"
  38 #include "runtime/javaCalls.hpp"
  39 #include "runtime/mutexLocker.hpp"
  40 #include "runtime/os.inline.hpp"
  41 #include "runtime/signature.hpp"
  42 #include "runtime/stubRoutines.hpp"
  43 #include "runtime/thread.inline.hpp"
  44 #if INCLUDE_JVMCI
  45 #include "jvmci/jvmciJavaClasses.hpp"
  46 #include "jvmci/jvmciRuntime.hpp"
  47 #endif
  48 
  49 // -----------------------------------------------------
  50 // Implementation of JavaCallWrapper
  51 
  52 JavaCallWrapper::JavaCallWrapper(const methodHandle& callee_method, Handle receiver, JavaValue* result, TRAPS) {
  53   JavaThread* thread = (JavaThread *)THREAD;
  54   bool clear_pending_exception = true;
  55 
  56   guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
  57   assert(!thread->owns_locks(), "must release all locks when leaving VM");
  58   guarantee(thread->can_call_java(), "cannot make java calls from the native compiler");
  59   _result   = result;
  60 
  61   // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub,
  62   // since it can potentially block.
  63   JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
  64 
  65   // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
  66   // info, since we cannot find oops before the new information is set up completely.
  67   ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java);
  68 
  69   // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state
  70   // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions
  71   // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state).
  72   if (thread->has_special_runtime_exit_condition()) {
  73     thread->handle_special_runtime_exit_condition();
  74     if (HAS_PENDING_EXCEPTION) {
  75       clear_pending_exception = false;
  76     }
  77   }
  78 
  79 
  80   // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
  81   // the JavaCallWrapper before the entry frame is on the stack.
  82   _callee_method = callee_method();
  83   _receiver = receiver();
  84 
  85 #ifdef CHECK_UNHANDLED_OOPS
  86   THREAD->allow_unhandled_oop(&_receiver);
  87 #endif // CHECK_UNHANDLED_OOPS
  88 
  89   _thread       = (JavaThread *)thread;
  90   _handles      = _thread->active_handles();    // save previous handle block & Java frame linkage
  91 
  92   // For the profiler, the last_Java_frame information in thread must always be in
  93   // legal state. We have no last Java frame if last_Java_sp == NULL so
  94   // the valid transition is to clear _last_Java_sp and then reset the rest of
  95   // the (platform specific) state.
  96 
  97   _anchor.copy(_thread->frame_anchor());
  98   _thread->frame_anchor()->clear();
  99 
 100   debug_only(_thread->inc_java_call_counter());
 101   _thread->set_active_handles(new_handles);     // install new handle block and reset Java frame linkage
 102 
 103   assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
 104 
 105   // clear any pending exception in thread (native calls start with no exception pending)
 106   if(clear_pending_exception) {
 107     _thread->clear_pending_exception();
 108   }
 109 
 110   if (_anchor.last_Java_sp() == NULL) {
 111     _thread->record_base_of_stack_pointer();
 112   }
 113 }
 114 
 115 
 116 JavaCallWrapper::~JavaCallWrapper() {
 117   assert(_thread == JavaThread::current(), "must still be the same thread");
 118 
 119   // restore previous handle block & Java frame linkage
 120   JNIHandleBlock *_old_handles = _thread->active_handles();
 121   _thread->set_active_handles(_handles);
 122 
 123   _thread->frame_anchor()->zap();
 124 
 125   debug_only(_thread->dec_java_call_counter());
 126 
 127   if (_anchor.last_Java_sp() == NULL) {
 128     _thread->set_base_of_stack_pointer(NULL);
 129   }
 130 
 131 
 132   // Old thread-local info. has been restored. We are not back in the VM.
 133   ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
 134 
 135   // State has been restored now make the anchor frame visible for the profiler.
 136   // Do this after the transition because this allows us to put an assert
 137   // the Java->vm transition which checks to see that stack is not walkable
 138   // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
 139   // invariants (i.e. _flags always cleared on return to Java)
 140 
 141   _thread->frame_anchor()->copy(&_anchor);
 142 
 143   // Release handles after we are marked as being inside the VM again, since this
 144   // operation might block
 145   JNIHandleBlock::release_block(_old_handles, _thread);
 146 }
 147 
 148 
 149 void JavaCallWrapper::oops_do(OopClosure* f) {
 150   f->do_oop((oop*)&_receiver);
 151   handles()->oops_do(f);
 152 }
 153 
 154 
 155 // Helper methods
 156 static BasicType runtime_type_from(JavaValue* result) {
 157   switch (result->get_type()) {
 158     case T_BOOLEAN: // fall through
 159     case T_CHAR   : // fall through
 160     case T_SHORT  : // fall through
 161     case T_INT    : // fall through
 162 #ifndef _LP64
 163     case T_OBJECT : // fall through
 164     case T_ARRAY  : // fall through
 165 #endif
 166     case T_BYTE   : // fall through
 167     case T_VOID   : return T_INT;
 168     case T_LONG   : return T_LONG;
 169     case T_FLOAT  : return T_FLOAT;
 170     case T_DOUBLE : return T_DOUBLE;
 171 #ifdef _LP64
 172     case T_ARRAY  : // fall through
 173     case T_OBJECT:  return T_OBJECT;
 174 #endif
 175     default:
 176       ShouldNotReachHere();
 177       return T_ILLEGAL;
 178   }
 179 }
 180 
 181 // ============ Virtual calls ============
 182 
 183 void JavaCalls::call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
 184   CallInfo callinfo;
 185   Handle receiver = args->receiver();
 186   Klass* recvrKlass = receiver.is_null() ? (Klass*)NULL : receiver->klass();
 187   LinkInfo link_info(spec_klass, name, signature);
 188   LinkResolver::resolve_virtual_call(
 189           callinfo, receiver, recvrKlass, link_info, true, CHECK);
 190   methodHandle method = callinfo.selected_method();
 191   assert(method.not_null(), "should have thrown exception");
 192 
 193   // Invoke the method
 194   JavaCalls::call(result, method, args, CHECK);
 195 }
 196 
 197 
 198 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, TRAPS) {
 199   JavaCallArguments args(receiver); // One oop argument
 200   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 201 }
 202 
 203 
 204 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
 205   JavaCallArguments args(receiver); // One oop argument
 206   args.push_oop(arg1);
 207   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 208 }
 209 
 210 
 211 
 212 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
 213   JavaCallArguments args(receiver); // One oop argument
 214   args.push_oop(arg1);
 215   args.push_oop(arg2);
 216   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 217 }
 218 
 219 
 220 // ============ Special calls ============
 221 
 222 void JavaCalls::call_special(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
 223   CallInfo callinfo;
 224   LinkInfo link_info(klass, name, signature);
 225   LinkResolver::resolve_special_call(callinfo, args->receiver(), link_info, CHECK);
 226   methodHandle method = callinfo.selected_method();
 227   assert(method.not_null(), "should have thrown exception");
 228 
 229   // Invoke the method
 230   JavaCalls::call(result, method, args, CHECK);
 231 }
 232 
 233 
 234 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
 235   JavaCallArguments args(receiver); // One oop argument
 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, TRAPS) {
 241   JavaCallArguments args(receiver); // One oop argument
 242   args.push_oop(arg1);
 243   call_special(result, klass, name, signature, &args, CHECK);
 244 }
 245 
 246 
 247 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
 248   JavaCallArguments args(receiver); // One oop argument
 249   args.push_oop(arg1);
 250   args.push_oop(arg2);
 251   call_special(result, klass, name, signature, &args, CHECK);
 252 }
 253 
 254 
 255 // ============ Static calls ============
 256 
 257 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
 258   CallInfo callinfo;
 259   LinkInfo link_info(klass, name, signature);
 260   LinkResolver::resolve_static_call(callinfo, link_info, true, CHECK);
 261   methodHandle method = callinfo.selected_method();
 262   assert(method.not_null(), "should have thrown exception");
 263 
 264   // Invoke the method
 265   JavaCalls::call(result, method, args, CHECK);
 266 }
 267 
 268 
 269 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
 270   JavaCallArguments args; // No argument
 271   call_static(result, klass, name, signature, &args, CHECK);
 272 }
 273 
 274 
 275 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
 276   JavaCallArguments args(arg1); // One oop argument
 277   call_static(result, klass, name, signature, &args, CHECK);
 278 }
 279 
 280 
 281 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
 282   JavaCallArguments args; // One oop argument
 283   args.push_oop(arg1);
 284   args.push_oop(arg2);
 285   call_static(result, klass, name, signature, &args, CHECK);
 286 }
 287 
 288 
 289 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS) {
 290   JavaCallArguments args; // One oop argument
 291   args.push_oop(arg1);
 292   args.push_oop(arg2);
 293   args.push_oop(arg3);
 294   call_static(result, klass, name, signature, &args, CHECK);
 295 }
 296 
 297 // -------------------------------------------------
 298 // Implementation of JavaCalls (low level)
 299 
 300 
 301 void JavaCalls::call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
 302   // Check if we need to wrap a potential OS exception handler around thread
 303   // This is used for e.g. Win32 structured exception handlers
 304   assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
 305   // Need to wrap each and every time, since there might be native code down the
 306   // stack that has installed its own exception handlers
 307   os::os_exception_wrapper(call_helper, result, method, args, THREAD);
 308 }
 309 
 310 void JavaCalls::call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
 311   // During dumping, Java execution environment is not fully initialized. Also, Java execution
 312   // may cause undesirable side-effects in the class metadata.
 313   assert(!DumpSharedSpaces, "must not execute Java bytecodes when dumping");
 314 
 315   JavaThread* thread = (JavaThread*)THREAD;
 316   assert(thread->is_Java_thread(), "must be called by a java thread");
 317   assert(method.not_null(), "must have a method to call");
 318   assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
 319   assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
 320 
 321 
 322   CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
 323 
 324 #if INCLUDE_JVMCI
 325   // Gets the nmethod (if any) that should be called instead of normal target
 326   nmethod* alternative_target = args->alternative_target();
 327   if (alternative_target == NULL) {
 328 #endif
 329 // Verify the arguments
 330 
 331   if (CheckJNICalls)  {
 332     args->verify(method, result->get_type());
 333   }
 334   else debug_only(args->verify(method, result->get_type()));
 335 #if INCLUDE_JVMCI
 336   }
 337 #else
 338 
 339   // Ignore call if method is empty
 340   if (method->is_empty_method()) {
 341     assert(result->get_type() == T_VOID, "an empty method must return a void value");
 342     return;
 343   }
 344 #endif
 345 
 346 #ifdef ASSERT
 347   { InstanceKlass* holder = method->method_holder();
 348     // A klass might not be initialized since JavaCall's might be used during the executing of
 349     // the <clinit>. For example, a Thread.start might start executing on an object that is
 350     // not fully initialized! (bad Java programming style)
 351     assert(holder->is_linked(), "rewriting must have taken place");
 352   }
 353 #endif
 354 
 355   CompilationPolicy::compile_if_required(method, CHECK);
 356 
 357   // Since the call stub sets up like the interpreter we call the from_interpreted_entry
 358   // so we can go compiled via a i2c. Otherwise initial entry method will always
 359   // run interpreted.
 360   address entry_point = method->from_interpreted_entry();
 361   if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
 362     entry_point = method->interpreter_entry();
 363   }
 364 
 365   // Figure out if the result value is an oop or not (Note: This is a different value
 366   // than result_type. result_type will be T_INT of oops. (it is about size)
 367   BasicType result_type = runtime_type_from(result);
 368   bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY);
 369 
 370   // NOTE: if we move the computation of the result_val_address inside
 371   // the call to call_stub, the optimizer produces wrong code.
 372   intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
 373 
 374   // Find receiver
 375   Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
 376 
 377   // When we reenter Java, we need to reenable the reserved/yellow zone which
 378   // might already be disabled when we are in VM.
 379   if (!thread->stack_guards_enabled()) {
 380     thread->reguard_stack();
 381   }
 382 
 383   // Check that there are shadow pages available before changing thread state
 384   // to Java. Calculate current_stack_pointer here to make sure
 385   // stack_shadow_pages_available() and bang_stack_shadow_pages() use the same sp.
 386   address sp = os::current_stack_pointer();
 387   if (!os::stack_shadow_pages_available(THREAD, method, sp)) {
 388     // Throw stack overflow exception with preinitialized exception.
 389     Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method);
 390     return;
 391   } else {
 392     // Touch pages checked if the OS needs them to be touched to be mapped.
 393     os::map_stack_shadow_pages(sp);
 394   }
 395 
 396 #if INCLUDE_JVMCI
 397   if (alternative_target != NULL) {
 398     if (alternative_target->is_alive()) {
 399       thread->set_jvmci_alternate_call_target(alternative_target->verified_entry_point());
 400       entry_point = method->adapter()->get_i2c_entry();
 401     } else {
 402       THROW(vmSymbols::jdk_vm_ci_code_InvalidInstalledCodeException());
 403     }
 404   }
 405 #endif
 406 
 407   // do call
 408   { JavaCallWrapper link(method, receiver, result, CHECK);
 409     { HandleMark hm(thread);  // HandleMark used by HandleMarkCleaner
 410 
 411       StubRoutines::call_stub()(
 412         (address)&link,
 413         // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
 414         result_val_address,          // see NOTE above (compiler problem)
 415         result_type,
 416         method(),
 417         entry_point,
 418         args->parameters(),
 419         args->size_of_parameters(),
 420         CHECK
 421       );
 422 
 423       result = link.result();  // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
 424       // Preserve oop return value across possible gc points
 425       if (oop_result_flag) {
 426         thread->set_vm_result((oop) result->get_jobject());
 427       }
 428     }
 429   } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
 430 
 431   // Check if a thread stop or suspend should be executed
 432   // The following assert was not realistic.  Thread.stop can set that bit at any moment.
 433   //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
 434 
 435   // Restore possible oop return
 436   if (oop_result_flag) {
 437     result->set_jobject((jobject)thread->vm_result());
 438     thread->set_vm_result(NULL);
 439   }
 440 }
 441 
 442 
 443 //--------------------------------------------------------------------------------------
 444 // Implementation of JavaCallArguments
 445 
 446 inline bool is_value_state_indirect_oop(uint state) {
 447   assert(state != JavaCallArguments::value_state_oop,
 448          "Checking for handles after removal");
 449   assert(state < JavaCallArguments::value_state_limit,
 450          "Invalid value state %u", state);
 451   return state != JavaCallArguments::value_state_primitive;
 452 }
 453 
 454 inline oop resolve_indirect_oop(intptr_t value, uint state) {
 455   switch (state) {
 456   case JavaCallArguments::value_state_handle:
 457   {
 458     oop* ptr = reinterpret_cast<oop*>(value);
 459     return Handle::raw_resolve(ptr);
 460   }
 461 
 462   case JavaCallArguments::value_state_jobject:
 463   {
 464     jobject obj = reinterpret_cast<jobject>(value);
 465     return JNIHandles::resolve(obj);
 466   }
 467 
 468   default:
 469     ShouldNotReachHere();
 470     return NULL;
 471   }
 472 }
 473 
 474 intptr_t* JavaCallArguments::parameters() {
 475   // First convert all handles to oops
 476   for(int i = 0; i < _size; i++) {
 477     uint state = _value_state[i];
 478     assert(state != value_state_oop, "Multiple handle conversions");
 479     if (is_value_state_indirect_oop(state)) {
 480       oop obj = resolve_indirect_oop(_value[i], state);
 481       _value[i] = cast_from_oop<intptr_t>(obj);
 482       _value_state[i] = value_state_oop;
 483     }
 484   }
 485   // Return argument vector
 486   return _value;
 487 }
 488 
 489 
 490 class SignatureChekker : public SignatureIterator {
 491  private:
 492    int _pos;
 493    BasicType _return_type;
 494    u_char* _value_state;
 495    intptr_t* _value;
 496 
 497  public:
 498   bool _is_return;
 499 
 500   SignatureChekker(Symbol* signature,
 501                    BasicType return_type,
 502                    bool is_static,
 503                    u_char* value_state,
 504                    intptr_t* value) :
 505     SignatureIterator(signature),
 506     _pos(0),
 507     _return_type(return_type),
 508     _value_state(value_state),
 509     _value(value),
 510     _is_return(false)
 511   {
 512     if (!is_static) {
 513       check_value(true); // Receiver must be an oop
 514     }
 515   }
 516 
 517   void check_value(bool type) {
 518     uint state = _value_state[_pos++];
 519     if (type) {
 520       guarantee(is_value_state_indirect_oop(state),
 521                 "signature does not match pushed arguments: %u at %d",
 522                 state, _pos - 1);
 523     } else {
 524       guarantee(state == JavaCallArguments::value_state_primitive,
 525                 "signature does not match pushed arguments: %u at %d",
 526                 state, _pos - 1);
 527     }
 528   }
 529 
 530   void check_doing_return(bool state) { _is_return = state; }
 531 
 532   void check_return_type(BasicType t) {
 533     guarantee(_is_return && t == _return_type, "return type does not match");
 534   }
 535 
 536   void check_int(BasicType t) {
 537     if (_is_return) {
 538       check_return_type(t);
 539       return;
 540     }
 541     check_value(false);
 542   }
 543 
 544   void check_double(BasicType t) { check_long(t); }
 545 
 546   void check_long(BasicType t) {
 547     if (_is_return) {
 548       check_return_type(t);
 549       return;
 550     }
 551 
 552     check_value(false);
 553     check_value(false);
 554   }
 555 
 556   void check_obj(BasicType t) {
 557     if (_is_return) {
 558       check_return_type(t);
 559       return;
 560     }
 561 
 562     intptr_t v = _value[_pos];
 563     if (v != 0) {
 564       // v is a "handle" referring to an oop, cast to integral type.
 565       // There shouldn't be any handles in very low memory.
 566       guarantee((size_t)v >= (size_t)os::vm_page_size(),
 567                 "Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
 568       // Verify the pointee.
 569       oop vv = resolve_indirect_oop(v, _value_state[_pos]);
 570       guarantee(vv->is_oop_or_null(true),
 571                 "Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
 572                 _pos, v, p2i(vv));
 573     }
 574 
 575     check_value(true);          // Verify value state.
 576   }
 577 
 578   void do_bool()                       { check_int(T_BOOLEAN);       }
 579   void do_char()                       { check_int(T_CHAR);          }
 580   void do_float()                      { check_int(T_FLOAT);         }
 581   void do_double()                     { check_double(T_DOUBLE);     }
 582   void do_byte()                       { check_int(T_BYTE);          }
 583   void do_short()                      { check_int(T_SHORT);         }
 584   void do_int()                        { check_int(T_INT);           }
 585   void do_long()                       { check_long(T_LONG);         }
 586   void do_void()                       { check_return_type(T_VOID);  }
 587   void do_object(int begin, int end)   { check_obj(T_OBJECT);        }
 588   void do_array(int begin, int end)    { check_obj(T_OBJECT);        }
 589 };
 590 
 591 
 592 void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
 593   guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
 594 
 595   // Treat T_OBJECT and T_ARRAY as the same
 596   if (return_type == T_ARRAY) return_type = T_OBJECT;
 597 
 598   // Check that oop information is correct
 599   Symbol* signature = method->signature();
 600 
 601   SignatureChekker sc(signature,
 602                       return_type,
 603                       method->is_static(),
 604                       _value_state,
 605                       _value);
 606   sc.iterate_parameters();
 607   sc.check_doing_return(true);
 608   sc.iterate_returntype();
 609 }