rev 55090 : secret-sfac

   1 /*
   2  * Copyright (c) 1997, 2018, 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.hpp"
  33 #include "oops/method.inline.hpp"
  34 #include "oops/oop.inline.hpp"
  35 #include "oops/valueKlass.hpp"
  36 #include "prims/jniCheck.hpp"
  37 #include "runtime/compilationPolicy.hpp"
  38 #include "runtime/handles.inline.hpp"
  39 #include "runtime/interfaceSupport.inline.hpp"
  40 #include "runtime/javaCalls.hpp"
  41 #include "runtime/jniHandles.inline.hpp"
  42 #include "runtime/mutexLocker.hpp"
  43 #include "runtime/os.inline.hpp"
  44 #include "runtime/sharedRuntime.hpp"
  45 #include "runtime/signature.hpp"
  46 #include "runtime/stubRoutines.hpp"
  47 #include "runtime/thread.inline.hpp"
  48 #if INCLUDE_JVMCI
  49 #include "jvmci/jvmciJavaClasses.hpp"
  50 #include "jvmci/jvmciRuntime.hpp"
  51 #endif
  52 
  53 // -----------------------------------------------------
  54 // Implementation of JavaCallWrapper
  55 
  56 JavaCallWrapper::JavaCallWrapper(const methodHandle& callee_method, Handle receiver, JavaValue* result, TRAPS) {
  57   JavaThread* thread = (JavaThread *)THREAD;
  58   bool clear_pending_exception = true;
  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   // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
  70   // info, since we cannot find oops before the new information is set up completely.
  71   ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java);
  72 
  73   // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state
  74   // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions
  75   // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state).
  76   if (thread->has_special_runtime_exit_condition()) {
  77     thread->handle_special_runtime_exit_condition();
  78     if (HAS_PENDING_EXCEPTION) {
  79       clear_pending_exception = false;
  80     }
  81   }
  82 
  83 
  84   // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
  85   // the JavaCallWrapper before the entry frame is on the stack.
  86   _callee_method = callee_method();
  87   _receiver = receiver();
  88 
  89 #ifdef CHECK_UNHANDLED_OOPS
  90   THREAD->allow_unhandled_oop(&_receiver);
  91 #endif // CHECK_UNHANDLED_OOPS
  92 
  93   _thread       = (JavaThread *)thread;
  94   _handles      = _thread->active_handles();    // save previous handle block & Java frame linkage
  95 
  96   // For the profiler, the last_Java_frame information in thread must always be in
  97   // legal state. We have no last Java frame if last_Java_sp == NULL so
  98   // the valid transition is to clear _last_Java_sp and then reset the rest of
  99   // the (platform specific) state.
 100 
 101   _anchor.copy(_thread->frame_anchor());
 102   _thread->frame_anchor()->clear();
 103 
 104   debug_only(_thread->inc_java_call_counter());
 105   _thread->set_active_handles(new_handles);     // install new handle block and reset Java frame linkage
 106 
 107   assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
 108 
 109   // clear any pending exception in thread (native calls start with no exception pending)
 110   if(clear_pending_exception) {
 111     _thread->clear_pending_exception();
 112   }
 113 
 114   if (_anchor.last_Java_sp() == NULL) {
 115     _thread->record_base_of_stack_pointer();
 116   }
 117 }
 118 
 119 
 120 JavaCallWrapper::~JavaCallWrapper() {
 121   assert(_thread == JavaThread::current(), "must still be the same thread");
 122 
 123   // restore previous handle block & Java frame linkage
 124   JNIHandleBlock *_old_handles = _thread->active_handles();
 125   _thread->set_active_handles(_handles);
 126 
 127   _thread->frame_anchor()->zap();
 128 
 129   debug_only(_thread->dec_java_call_counter());
 130 
 131   if (_anchor.last_Java_sp() == NULL) {
 132     _thread->set_base_of_stack_pointer(NULL);
 133   }
 134 
 135 
 136   // Old thread-local info. has been restored. We are not back in the VM.
 137   ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
 138 
 139   // State has been restored now make the anchor frame visible for the profiler.
 140   // Do this after the transition because this allows us to put an assert
 141   // the Java->vm transition which checks to see that stack is not walkable
 142   // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
 143   // invariants (i.e. _flags always cleared on return to Java)
 144 
 145   _thread->frame_anchor()->copy(&_anchor);
 146 
 147   // Release handles after we are marked as being inside the VM again, since this
 148   // operation might block
 149   JNIHandleBlock::release_block(_old_handles, _thread);
 150 }
 151 
 152 
 153 void JavaCallWrapper::oops_do(OopClosure* f) {
 154   f->do_oop((oop*)&_receiver);
 155   handles()->oops_do(f);
 156 }
 157 
 158 
 159 // Helper methods
 160 static BasicType runtime_type_from(JavaValue* result) {
 161   switch (result->get_type()) {
 162     case T_BOOLEAN  : // fall through
 163     case T_CHAR     : // fall through
 164     case T_SHORT    : // fall through
 165     case T_INT      : // fall through
 166 #ifndef _LP64
 167     case T_OBJECT   : // fall through
 168     case T_ARRAY    : // fall through
 169     case T_VALUETYPE: // fall through
 170 #endif
 171     case T_BYTE     : // fall through
 172     case T_VOID     : return T_INT;
 173     case T_LONG     : return T_LONG;
 174     case T_FLOAT    : return T_FLOAT;
 175     case T_DOUBLE   : return T_DOUBLE;
 176 #ifdef _LP64
 177     case T_ARRAY    : // fall through
 178     case T_OBJECT   : return T_OBJECT;
 179     case T_VALUETYPE: return T_VALUETYPE;
 180 #endif
 181     default:
 182       ShouldNotReachHere();
 183       return T_ILLEGAL;
 184   }
 185 }
 186 
 187 // ============ Virtual calls ============
 188 
 189 void JavaCalls::call_virtual(JavaValue* result, Klass* spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
 190   CallInfo callinfo;
 191   Handle receiver = args->receiver();
 192   Klass* recvrKlass = receiver.is_null() ? (Klass*)NULL : receiver->klass();
 193   LinkInfo link_info(spec_klass, name, signature);
 194   LinkResolver::resolve_virtual_call(
 195           callinfo, receiver, recvrKlass, link_info, true, CHECK);
 196   methodHandle method = callinfo.selected_method();
 197   assert(method.not_null(), "should have thrown exception");
 198 
 199   // Invoke the method
 200   JavaCalls::call(result, method, args, CHECK);
 201 }
 202 
 203 
 204 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, TRAPS) {
 205   JavaCallArguments args(receiver);
 206   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 207 }
 208 
 209 
 210 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
 211   JavaCallArguments args(receiver);
 212   args.push_oop(arg1);
 213   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 214 }
 215 
 216 
 217 
 218 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, Klass* spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
 219   JavaCallArguments args(receiver);
 220   args.push_oop(arg1);
 221   args.push_oop(arg2);
 222   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 223 }
 224 
 225 
 226 // ============ Special calls ============
 227 
 228 void JavaCalls::call_special(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
 229   CallInfo callinfo;
 230   LinkInfo link_info(klass, name, signature);
 231   LinkResolver::resolve_special_call(callinfo, args->receiver(), link_info, CHECK);
 232   methodHandle method = callinfo.selected_method();
 233   assert(method.not_null(), "should have thrown exception");
 234 
 235   // Invoke the method
 236   JavaCalls::call(result, method, args, CHECK);
 237 }
 238 
 239 
 240 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
 241   JavaCallArguments args(receiver);
 242   call_special(result, klass, name, signature, &args, CHECK);
 243 }
 244 
 245 
 246 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS) {
 247   JavaCallArguments args(receiver);
 248   args.push_oop(arg1);
 249   call_special(result, klass, name, signature, &args, CHECK);
 250 }
 251 
 252 
 253 void JavaCalls::call_special(JavaValue* result, Handle receiver, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
 254   JavaCallArguments args(receiver);
 255   args.push_oop(arg1);
 256   args.push_oop(arg2);
 257   call_special(result, klass, name, signature, &args, CHECK);
 258 }
 259 
 260 
 261 // ============ Static calls ============
 262 
 263 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS) {
 264   CallInfo callinfo;
 265   LinkInfo link_info(klass, name, signature);
 266   LinkResolver::resolve_static_call(callinfo, link_info, true, CHECK);
 267   methodHandle method = callinfo.selected_method();
 268   assert(method.not_null(), "should have thrown exception");
 269 
 270   // Invoke the method
 271   JavaCalls::call(result, method, args, CHECK);
 272 }
 273 
 274 
 275 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, TRAPS) {
 276   JavaCallArguments args;
 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, TRAPS) {
 282   JavaCallArguments args(arg1);
 283   call_static(result, klass, name, signature, &args, CHECK);
 284 }
 285 
 286 
 287 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS) {
 288   JavaCallArguments args;
 289   args.push_oop(arg1);
 290   args.push_oop(arg2);
 291   call_static(result, klass, name, signature, &args, CHECK);
 292 }
 293 
 294 
 295 void JavaCalls::call_static(JavaValue* result, Klass* klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, Handle arg3, TRAPS) {
 296   JavaCallArguments args;
 297   args.push_oop(arg1);
 298   args.push_oop(arg2);
 299   args.push_oop(arg3);
 300   call_static(result, klass, name, signature, &args, CHECK);
 301 }
 302 
 303 // ============ allocate and initialize new object instance ============
 304 
 305 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, JavaCallArguments* args, TRAPS) {
 306   klass->initialize(CHECK_NH); // Quick no-op if already initialized.













 307   Handle obj = klass->allocate_instance_handle(CHECK_NH);
 308   JavaValue void_result(T_VOID);
 309   args->set_receiver(obj); // inserts <obj> as the first argument.
 310   JavaCalls::call_special(&void_result, klass,
 311                           vmSymbols::object_initializer_name(),
 312                           constructor_signature, args, CHECK_NH);
 313   // Already returned a Null Handle if any exception is pending.
 314   return obj;
 315 }
 316 
 317 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, TRAPS) {
 318   JavaCallArguments args;
 319   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
 320 }
 321 
 322 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, TRAPS) {
 323   JavaCallArguments args;
 324   args.push_oop(arg1);
 325   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
 326 }
 327 
 328 Handle JavaCalls::construct_new_instance(InstanceKlass* klass, Symbol* constructor_signature, Handle arg1, Handle arg2, TRAPS) {
 329   JavaCallArguments args;
 330   args.push_oop(arg1);
 331   args.push_oop(arg2);
 332   return JavaCalls::construct_new_instance(klass, constructor_signature, &args, THREAD);
 333 }
 334 
 335 // -------------------------------------------------
 336 // Implementation of JavaCalls (low level)
 337 
 338 
 339 void JavaCalls::call(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
 340   // Check if we need to wrap a potential OS exception handler around thread
 341   // This is used for e.g. Win32 structured exception handlers
 342   assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
 343   // Need to wrap each and every time, since there might be native code down the
 344   // stack that has installed its own exception handlers
 345   os::os_exception_wrapper(call_helper, result, method, args, THREAD);
 346 }
 347 
 348 void JavaCalls::call_helper(JavaValue* result, const methodHandle& method, JavaCallArguments* args, TRAPS) {
 349 
 350   JavaThread* thread = (JavaThread*)THREAD;
 351   assert(thread->is_Java_thread(), "must be called by a java 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 
 357   CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
 358 
 359 #if INCLUDE_JVMCI
 360   // Gets the nmethod (if any) that should be called instead of normal target
 361   nmethod* alternative_target = args->alternative_target();
 362   if (alternative_target == NULL) {
 363 #endif
 364 // Verify the arguments
 365 
 366   if (CheckJNICalls)  {
 367     args->verify(method, result->get_type());
 368   }
 369   else debug_only(args->verify(method, result->get_type()));
 370 #if INCLUDE_JVMCI
 371   }
 372 #else
 373 
 374   // Ignore call if method is empty
 375   if (method->is_empty_method()) {
 376     assert(result->get_type() == T_VOID, "an empty method must return a void value");
 377     return;
 378   }
 379 #endif
 380 
 381 #ifdef ASSERT
 382   { InstanceKlass* holder = method->method_holder();
 383     // A klass might not be initialized since JavaCall's might be used during the executing of
 384     // the <clinit>. For example, a Thread.start might start executing on an object that is
 385     // not fully initialized! (bad Java programming style)
 386     assert(holder->is_linked(), "rewriting must have taken place");
 387   }
 388 #endif
 389 
 390   CompilationPolicy::compile_if_required(method, CHECK);
 391 
 392   // Since the call stub sets up like the interpreter we call the from_interpreted_entry
 393   // so we can go compiled via a i2c. Otherwise initial entry method will always
 394   // run interpreted.
 395   address entry_point = method->from_interpreted_entry();
 396   if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
 397     entry_point = method->interpreter_entry();
 398   }
 399 
 400   // Figure out if the result value is an oop or not (Note: This is a different value
 401   // than result_type. result_type will be T_INT of oops. (it is about size)
 402   BasicType result_type = runtime_type_from(result);
 403   bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY
 404                           || result->get_type() == T_VALUETYPE);
 405 
 406   // NOTE: if we move the computation of the result_val_address inside
 407   // the call to call_stub, the optimizer produces wrong code.
 408   intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
 409 
 410   // Find receiver
 411   Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
 412 
 413   // When we reenter Java, we need to reenable the reserved/yellow zone which
 414   // might already be disabled when we are in VM.
 415   if (!thread->stack_guards_enabled()) {
 416     thread->reguard_stack();
 417   }
 418 
 419   // Check that there are shadow pages available before changing thread state
 420   // to Java. Calculate current_stack_pointer here to make sure
 421   // stack_shadow_pages_available() and bang_stack_shadow_pages() use the same sp.
 422   address sp = os::current_stack_pointer();
 423   if (!os::stack_shadow_pages_available(THREAD, method, sp)) {
 424     // Throw stack overflow exception with preinitialized exception.
 425     Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__, method);
 426     return;
 427   } else {
 428     // Touch pages checked if the OS needs them to be touched to be mapped.
 429     os::map_stack_shadow_pages(sp);
 430   }
 431 
 432 #if INCLUDE_JVMCI
 433   if (alternative_target != NULL) {
 434     if (alternative_target->is_alive() && !alternative_target->is_unloading()) {
 435       thread->set_jvmci_alternate_call_target(alternative_target->verified_entry_point());
 436       entry_point = method->adapter()->get_i2c_entry();
 437     } else {
 438       THROW(vmSymbols::jdk_vm_ci_code_InvalidInstalledCodeException());
 439     }
 440   }
 441 #endif
 442 
 443   // do call
 444   { JavaCallWrapper link(method, receiver, result, CHECK);
 445     { HandleMark hm(thread);  // HandleMark used by HandleMarkCleaner
 446 
 447       StubRoutines::call_stub()(
 448         (address)&link,
 449         // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
 450         result_val_address,          // see NOTE above (compiler problem)
 451         result_type,
 452         method(),
 453         entry_point,
 454         args->parameters(),
 455         args->size_of_parameters(),
 456         CHECK
 457       );
 458 
 459       result = link.result();  // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
 460       // Preserve oop return value across possible gc points
 461       if (oop_result_flag) {
 462         thread->set_vm_result((oop) result->get_jobject());
 463       }
 464     }
 465   } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
 466 
 467   // Check if a thread stop or suspend should be executed
 468   // The following assert was not realistic.  Thread.stop can set that bit at any moment.
 469   //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
 470 
 471   // Restore possible oop return
 472   if (oop_result_flag) {
 473     result->set_jobject((jobject)thread->vm_result());
 474     thread->set_vm_result(NULL);
 475   }
 476 }
 477 
 478 
 479 //--------------------------------------------------------------------------------------
 480 // Implementation of JavaCallArguments
 481 
 482 inline bool is_value_state_indirect_oop(uint state) {
 483   assert(state != JavaCallArguments::value_state_oop,
 484          "Checking for handles after removal");
 485   assert(state < JavaCallArguments::value_state_limit,
 486          "Invalid value state %u", state);
 487   return state != JavaCallArguments::value_state_primitive;
 488 }
 489 
 490 inline oop resolve_indirect_oop(intptr_t value, uint state) {
 491   switch (state) {
 492   case JavaCallArguments::value_state_handle:
 493   {
 494     oop* ptr = reinterpret_cast<oop*>(value);
 495     return Handle::raw_resolve(ptr);
 496   }
 497 
 498   case JavaCallArguments::value_state_jobject:
 499   {
 500     jobject obj = reinterpret_cast<jobject>(value);
 501     return JNIHandles::resolve(obj);
 502   }
 503 
 504   default:
 505     ShouldNotReachHere();
 506     return NULL;
 507   }
 508 }
 509 
 510 intptr_t* JavaCallArguments::parameters() {
 511   // First convert all handles to oops
 512   for(int i = 0; i < _size; i++) {
 513     uint state = _value_state[i];
 514     assert(state != value_state_oop, "Multiple handle conversions");
 515     if (is_value_state_indirect_oop(state)) {
 516       oop obj = resolve_indirect_oop(_value[i], state);
 517       _value[i] = cast_from_oop<intptr_t>(obj);
 518       _value_state[i] = value_state_oop;
 519     }
 520   }
 521   // Return argument vector
 522   return _value;
 523 }
 524 
 525 
 526 class SignatureChekker : public SignatureIterator {
 527  private:
 528    int _pos;
 529    BasicType _return_type;
 530    u_char* _value_state;
 531    intptr_t* _value;
 532 
 533  public:
 534   bool _is_return;
 535 
 536   SignatureChekker(Symbol* signature,
 537                    BasicType return_type,
 538                    bool is_static,
 539                    u_char* value_state,
 540                    intptr_t* value) :
 541     SignatureIterator(signature),
 542     _pos(0),
 543     _return_type(return_type),
 544     _value_state(value_state),
 545     _value(value),
 546     _is_return(false)
 547   {
 548     if (!is_static) {
 549       check_value(true); // Receiver must be an oop
 550     }
 551   }
 552 
 553   void check_value(bool type) {
 554     uint state = _value_state[_pos++];
 555     if (type) {
 556       guarantee(is_value_state_indirect_oop(state),
 557                 "signature does not match pushed arguments: %u at %d",
 558                 state, _pos - 1);
 559     } else {
 560       guarantee(state == JavaCallArguments::value_state_primitive,
 561                 "signature does not match pushed arguments: %u at %d",
 562                 state, _pos - 1);
 563     }
 564   }
 565 
 566   void check_doing_return(bool state) { _is_return = state; }
 567 
 568   void check_return_type(BasicType t) {
 569     guarantee(_is_return && t == _return_type, "return type does not match");
 570   }
 571 
 572   void check_int(BasicType t) {
 573     if (_is_return) {
 574       check_return_type(t);
 575       return;
 576     }
 577     check_value(false);
 578   }
 579 
 580   void check_double(BasicType t) { check_long(t); }
 581 
 582   void check_long(BasicType t) {
 583     if (_is_return) {
 584       check_return_type(t);
 585       return;
 586     }
 587 
 588     check_value(false);
 589     check_value(false);
 590   }
 591 
 592   void check_obj(BasicType t) {
 593     if (_is_return) {
 594       check_return_type(t);
 595       return;
 596     }
 597 
 598     intptr_t v = _value[_pos];
 599     if (v != 0) {
 600       // v is a "handle" referring to an oop, cast to integral type.
 601       // There shouldn't be any handles in very low memory.
 602       guarantee((size_t)v >= (size_t)os::vm_page_size(),
 603                 "Bad JNI oop argument %d: " PTR_FORMAT, _pos, v);
 604       // Verify the pointee.
 605       oop vv = resolve_indirect_oop(v, _value_state[_pos]);
 606       guarantee(oopDesc::is_oop_or_null(vv, true),
 607                 "Bad JNI oop argument %d: " PTR_FORMAT " -> " PTR_FORMAT,
 608                 _pos, v, p2i(vv));
 609     }
 610 
 611     check_value(true);          // Verify value state.
 612   }
 613 
 614   void do_bool()                       { check_int(T_BOOLEAN);       }
 615   void do_char()                       { check_int(T_CHAR);          }
 616   void do_float()                      { check_int(T_FLOAT);         }
 617   void do_double()                     { check_double(T_DOUBLE);     }
 618   void do_byte()                       { check_int(T_BYTE);          }
 619   void do_short()                      { check_int(T_SHORT);         }
 620   void do_int()                        { check_int(T_INT);           }
 621   void do_long()                       { check_long(T_LONG);         }
 622   void do_void()                       { check_return_type(T_VOID);  }
 623   void do_object(int begin, int end)   { check_obj(T_OBJECT);        }
 624   void do_valuetype(int begin, int end){ check_obj(T_VALUETYPE);     }
 625   void do_array(int begin, int end)    { check_obj(T_OBJECT);        }
 626 };
 627 
 628 
 629 void JavaCallArguments::verify(const methodHandle& method, BasicType return_type) {
 630   guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
 631 
 632   // Treat T_OBJECT and T_ARRAY as the same
 633   if (return_type == T_ARRAY) return_type = T_OBJECT;
 634 
 635   // Check that oop information is correct
 636   Symbol* signature = method->signature();
 637 
 638   SignatureChekker sc(signature,
 639                       return_type,
 640                       method->is_static(),
 641                       _value_state,
 642                       _value);
 643   sc.iterate_parameters();
 644   sc.check_doing_return(true);
 645   sc.iterate_returntype();
 646 }
--- EOF ---