1 /*
   2  * Copyright (c) 2012, 2019, 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 #include "precompiled.hpp"
  25 #include "classfile/symbolTable.hpp"
  26 #include "compiler/compileBroker.hpp"
  27 #include "jvmci/jniAccessMark.inline.hpp"
  28 #include "jvmci/jvmciCompilerToVM.hpp"
  29 #include "jvmci/jvmciRuntime.hpp"
  30 #include "logging/log.hpp"
  31 #include "memory/oopFactory.hpp"
  32 #include "memory/universe.hpp"
  33 #include "oops/constantPool.inline.hpp"
  34 #include "oops/method.inline.hpp"
  35 #include "oops/objArrayKlass.hpp"
  36 #include "oops/oop.inline.hpp"
  37 #include "runtime/biasedLocking.hpp"
  38 #include "runtime/deoptimization.hpp"
  39 #include "runtime/fieldDescriptor.inline.hpp"
  40 #include "runtime/frame.inline.hpp"
  41 #include "runtime/sharedRuntime.hpp"
  42 #if INCLUDE_G1GC
  43 #include "gc/g1/g1ThreadLocalData.hpp"
  44 #endif // INCLUDE_G1GC
  45 
  46 // Simple helper to see if the caller of a runtime stub which
  47 // entered the VM has been deoptimized
  48 
  49 static bool caller_is_deopted() {
  50   JavaThread* thread = JavaThread::current();
  51   RegisterMap reg_map(thread, false);
  52   frame runtime_frame = thread->last_frame();
  53   frame caller_frame = runtime_frame.sender(&reg_map);
  54   assert(caller_frame.is_compiled_frame(), "must be compiled");
  55   return caller_frame.is_deoptimized_frame();
  56 }
  57 
  58 // Stress deoptimization
  59 static void deopt_caller() {
  60   if ( !caller_is_deopted()) {
  61     JavaThread* thread = JavaThread::current();
  62     RegisterMap reg_map(thread, false);
  63     frame runtime_frame = thread->last_frame();
  64     frame caller_frame = runtime_frame.sender(&reg_map);
  65     Deoptimization::deoptimize_frame(thread, caller_frame.id(), Deoptimization::Reason_constraint);
  66     assert(caller_is_deopted(), "Must be deoptimized");
  67   }
  68 }
  69 
  70 // Manages a scope for a JVMCI runtime call that attempts a heap allocation.
  71 // If there is a pending exception upon closing the scope and the runtime
  72 // call is of the variety where allocation failure returns NULL without an
  73 // exception, the following action is taken:
  74 //   1. The pending exception is cleared
  75 //   2. NULL is written to JavaThread::_vm_result
  76 //   3. Checks that an OutOfMemoryError is Universe::out_of_memory_error_retry().
  77 class RetryableAllocationMark: public StackObj {
  78  private:
  79   JavaThread* _thread;
  80  public:
  81   RetryableAllocationMark(JavaThread* thread, bool activate) {
  82     if (activate) {
  83       assert(!thread->in_retryable_allocation(), "retryable allocation scope is non-reentrant");
  84       _thread = thread;
  85       _thread->set_in_retryable_allocation(true);
  86     } else {
  87       _thread = NULL;
  88     }
  89   }
  90   ~RetryableAllocationMark() {
  91     if (_thread != NULL) {
  92       _thread->set_in_retryable_allocation(false);
  93       JavaThread* THREAD = _thread;
  94       if (HAS_PENDING_EXCEPTION) {
  95         oop ex = PENDING_EXCEPTION;
  96         CLEAR_PENDING_EXCEPTION;
  97         oop retry_oome = Universe::out_of_memory_error_retry();
  98         if (ex->is_a(retry_oome->klass()) && retry_oome != ex) {
  99           ResourceMark rm;
 100           fatal("Unexpected exception in scope of retryable allocation: " INTPTR_FORMAT " of type %s", p2i(ex), ex->klass()->external_name());
 101         }
 102         _thread->set_vm_result(NULL);
 103       }
 104     }
 105   }
 106 };
 107 
 108 JRT_BLOCK_ENTRY(void, JVMCIRuntime::new_instance_common(JavaThread* thread, Klass* klass, bool null_on_fail))
 109   JRT_BLOCK;
 110   assert(klass->is_klass(), "not a class");
 111   Handle holder(THREAD, klass->klass_holder()); // keep the klass alive
 112   InstanceKlass* h = InstanceKlass::cast(klass);
 113   {
 114     RetryableAllocationMark ram(thread, null_on_fail);
 115     h->check_valid_for_instantiation(true, CHECK);
 116     oop obj;
 117     if (null_on_fail) {
 118       if (!h->is_initialized()) {
 119         // Cannot re-execute class initialization without side effects
 120         // so return without attempting the initialization
 121         return;
 122       }
 123     } else {
 124       // make sure klass is initialized
 125       h->initialize(CHECK);
 126     }
 127     // allocate instance and return via TLS
 128     obj = h->allocate_instance(CHECK);
 129     thread->set_vm_result(obj);
 130   }
 131   JRT_BLOCK_END;
 132   SharedRuntime::on_slowpath_allocation_exit(thread);
 133 JRT_END
 134 
 135 JRT_BLOCK_ENTRY(void, JVMCIRuntime::new_array_common(JavaThread* thread, Klass* array_klass, jint length, bool null_on_fail))
 136   JRT_BLOCK;
 137   // Note: no handle for klass needed since they are not used
 138   //       anymore after new_objArray() and no GC can happen before.
 139   //       (This may have to change if this code changes!)
 140   assert(array_klass->is_klass(), "not a class");
 141   oop obj;
 142   if (array_klass->is_typeArray_klass()) {
 143     BasicType elt_type = TypeArrayKlass::cast(array_klass)->element_type();
 144     RetryableAllocationMark ram(thread, null_on_fail);
 145     obj = oopFactory::new_typeArray(elt_type, length, CHECK);
 146   } else {
 147     Handle holder(THREAD, array_klass->klass_holder()); // keep the klass alive
 148     Klass* elem_klass = ObjArrayKlass::cast(array_klass)->element_klass();
 149     RetryableAllocationMark ram(thread, null_on_fail);
 150     obj = oopFactory::new_objArray(elem_klass, length, CHECK);
 151   }
 152   thread->set_vm_result(obj);
 153   // This is pretty rare but this runtime patch is stressful to deoptimization
 154   // if we deoptimize here so force a deopt to stress the path.
 155   if (DeoptimizeALot) {
 156     static int deopts = 0;
 157     // Alternate between deoptimizing and raising an error (which will also cause a deopt)
 158     if (deopts++ % 2 == 0) {
 159       if (null_on_fail) {
 160         return;
 161       } else {
 162         ResourceMark rm(THREAD);
 163         THROW(vmSymbols::java_lang_OutOfMemoryError());
 164       }
 165     } else {
 166       deopt_caller();
 167     }
 168   }
 169   JRT_BLOCK_END;
 170   SharedRuntime::on_slowpath_allocation_exit(thread);
 171 JRT_END
 172 
 173 JRT_ENTRY(void, JVMCIRuntime::new_multi_array_common(JavaThread* thread, Klass* klass, int rank, jint* dims, bool null_on_fail))
 174   assert(klass->is_klass(), "not a class");
 175   assert(rank >= 1, "rank must be nonzero");
 176   Handle holder(THREAD, klass->klass_holder()); // keep the klass alive
 177   RetryableAllocationMark ram(thread, null_on_fail);
 178   oop obj = ArrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK);
 179   thread->set_vm_result(obj);
 180 JRT_END
 181 
 182 JRT_ENTRY(void, JVMCIRuntime::dynamic_new_array_common(JavaThread* thread, oopDesc* element_mirror, jint length, bool null_on_fail))
 183   RetryableAllocationMark ram(thread, null_on_fail);
 184   oop obj = Reflection::reflect_new_array(element_mirror, length, CHECK);
 185   thread->set_vm_result(obj);
 186 JRT_END
 187 
 188 JRT_ENTRY(void, JVMCIRuntime::dynamic_new_instance_common(JavaThread* thread, oopDesc* type_mirror, bool null_on_fail))
 189   InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(type_mirror));
 190 
 191   if (klass == NULL) {
 192     ResourceMark rm(THREAD);
 193     THROW(vmSymbols::java_lang_InstantiationException());
 194   }
 195   RetryableAllocationMark ram(thread, null_on_fail);
 196 
 197   // Create new instance (the receiver)
 198   klass->check_valid_for_instantiation(false, CHECK);
 199 
 200   if (null_on_fail) {
 201     if (!klass->is_initialized()) {
 202       // Cannot re-execute class initialization without side effects
 203       // so return without attempting the initialization
 204       return;
 205     }
 206   } else {
 207     // Make sure klass gets initialized
 208     klass->initialize(CHECK);
 209   }
 210 
 211   oop obj = klass->allocate_instance(CHECK);
 212   thread->set_vm_result(obj);
 213 JRT_END
 214 
 215 extern void vm_exit(int code);
 216 
 217 // Enter this method from compiled code handler below. This is where we transition
 218 // to VM mode. This is done as a helper routine so that the method called directly
 219 // from compiled code does not have to transition to VM. This allows the entry
 220 // method to see if the nmethod that we have just looked up a handler for has
 221 // been deoptimized while we were in the vm. This simplifies the assembly code
 222 // cpu directories.
 223 //
 224 // We are entering here from exception stub (via the entry method below)
 225 // If there is a compiled exception handler in this method, we will continue there;
 226 // otherwise we will unwind the stack and continue at the caller of top frame method
 227 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to
 228 // control the area where we can allow a safepoint. After we exit the safepoint area we can
 229 // check to see if the handler we are going to return is now in a nmethod that has
 230 // been deoptimized. If that is the case we return the deopt blob
 231 // unpack_with_exception entry instead. This makes life for the exception blob easier
 232 // because making that same check and diverting is painful from assembly language.
 233 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, CompiledMethod*& cm))
 234   // Reset method handle flag.
 235   thread->set_is_method_handle_return(false);
 236 
 237   Handle exception(thread, ex);
 238   cm = CodeCache::find_compiled(pc);
 239   assert(cm != NULL, "this is not a compiled method");
 240   // Adjust the pc as needed/
 241   if (cm->is_deopt_pc(pc)) {
 242     RegisterMap map(thread, false);
 243     frame exception_frame = thread->last_frame().sender(&map);
 244     // if the frame isn't deopted then pc must not correspond to the caller of last_frame
 245     assert(exception_frame.is_deoptimized_frame(), "must be deopted");
 246     pc = exception_frame.pc();
 247   }
 248 #ifdef ASSERT
 249   assert(exception.not_null(), "NULL exceptions should be handled by throw_exception");
 250   assert(oopDesc::is_oop(exception()), "just checking");
 251   // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
 252   if (!(exception->is_a(SystemDictionary::Throwable_klass()))) {
 253     if (ExitVMOnVerifyError) vm_exit(-1);
 254     ShouldNotReachHere();
 255   }
 256 #endif
 257 
 258   // Check the stack guard pages and reenable them if necessary and there is
 259   // enough space on the stack to do so.  Use fast exceptions only if the guard
 260   // pages are enabled.
 261   bool guard_pages_enabled = thread->stack_guards_enabled();
 262   if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
 263 
 264   if (JvmtiExport::can_post_on_exceptions()) {
 265     // To ensure correct notification of exception catches and throws
 266     // we have to deoptimize here.  If we attempted to notify the
 267     // catches and throws during this exception lookup it's possible
 268     // we could deoptimize on the way out of the VM and end back in
 269     // the interpreter at the throw site.  This would result in double
 270     // notifications since the interpreter would also notify about
 271     // these same catches and throws as it unwound the frame.
 272 
 273     RegisterMap reg_map(thread);
 274     frame stub_frame = thread->last_frame();
 275     frame caller_frame = stub_frame.sender(&reg_map);
 276 
 277     // We don't really want to deoptimize the nmethod itself since we
 278     // can actually continue in the exception handler ourselves but I
 279     // don't see an easy way to have the desired effect.
 280     Deoptimization::deoptimize_frame(thread, caller_frame.id(), Deoptimization::Reason_constraint);
 281     assert(caller_is_deopted(), "Must be deoptimized");
 282 
 283     return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
 284   }
 285 
 286   // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions
 287   if (guard_pages_enabled) {
 288     address fast_continuation = cm->handler_for_exception_and_pc(exception, pc);
 289     if (fast_continuation != NULL) {
 290       // Set flag if return address is a method handle call site.
 291       thread->set_is_method_handle_return(cm->is_method_handle_return(pc));
 292       return fast_continuation;
 293     }
 294   }
 295 
 296   // If the stack guard pages are enabled, check whether there is a handler in
 297   // the current method.  Otherwise (guard pages disabled), force an unwind and
 298   // skip the exception cache update (i.e., just leave continuation==NULL).
 299   address continuation = NULL;
 300   if (guard_pages_enabled) {
 301 
 302     // New exception handling mechanism can support inlined methods
 303     // with exception handlers since the mappings are from PC to PC
 304 
 305     // debugging support
 306     // tracing
 307     if (log_is_enabled(Info, exceptions)) {
 308       ResourceMark rm;
 309       stringStream tempst;
 310       assert(cm->method() != NULL, "Unexpected null method()");
 311       tempst.print("compiled method <%s>\n"
 312                    " at PC" INTPTR_FORMAT " for thread " INTPTR_FORMAT,
 313                    cm->method()->print_value_string(), p2i(pc), p2i(thread));
 314       Exceptions::log_exception(exception, tempst.as_string());
 315     }
 316     // for AbortVMOnException flag
 317     NOT_PRODUCT(Exceptions::debug_check_abort(exception));
 318 
 319     // Clear out the exception oop and pc since looking up an
 320     // exception handler can cause class loading, which might throw an
 321     // exception and those fields are expected to be clear during
 322     // normal bytecode execution.
 323     thread->clear_exception_oop_and_pc();
 324 
 325     bool recursive_exception = false;
 326     continuation = SharedRuntime::compute_compiled_exc_handler(cm, pc, exception, false, false, recursive_exception);
 327     // If an exception was thrown during exception dispatch, the exception oop may have changed
 328     thread->set_exception_oop(exception());
 329     thread->set_exception_pc(pc);
 330 
 331     // The exception cache is used only for non-implicit exceptions
 332     // Update the exception cache only when another exception did
 333     // occur during the computation of the compiled exception handler
 334     // (e.g., when loading the class of the catch type).
 335     // Checking for exception oop equality is not
 336     // sufficient because some exceptions are pre-allocated and reused.
 337     if (continuation != NULL && !recursive_exception && !SharedRuntime::deopt_blob()->contains(continuation)) {
 338       cm->add_handler_for_exception_and_pc(exception, pc, continuation);
 339     }
 340   }
 341 
 342   // Set flag if return address is a method handle call site.
 343   thread->set_is_method_handle_return(cm->is_method_handle_return(pc));
 344 
 345   if (log_is_enabled(Info, exceptions)) {
 346     ResourceMark rm;
 347     log_info(exceptions)("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT
 348                          " for exception thrown at PC " PTR_FORMAT,
 349                          p2i(thread), p2i(continuation), p2i(pc));
 350   }
 351 
 352   return continuation;
 353 JRT_END
 354 
 355 // Enter this method from compiled code only if there is a Java exception handler
 356 // in the method handling the exception.
 357 // We are entering here from exception stub. We don't do a normal VM transition here.
 358 // We do it in a helper. This is so we can check to see if the nmethod we have just
 359 // searched for an exception handler has been deoptimized in the meantime.
 360 address JVMCIRuntime::exception_handler_for_pc(JavaThread* thread) {
 361   oop exception = thread->exception_oop();
 362   address pc = thread->exception_pc();
 363   // Still in Java mode
 364   DEBUG_ONLY(ResetNoHandleMark rnhm);
 365   CompiledMethod* cm = NULL;
 366   address continuation = NULL;
 367   {
 368     // Enter VM mode by calling the helper
 369     ResetNoHandleMark rnhm;
 370     continuation = exception_handler_for_pc_helper(thread, exception, pc, cm);
 371   }
 372   // Back in JAVA, use no oops DON'T safepoint
 373 
 374   // Now check to see if the compiled method we were called from is now deoptimized.
 375   // If so we must return to the deopt blob and deoptimize the nmethod
 376   if (cm != NULL && caller_is_deopted()) {
 377     continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
 378   }
 379 
 380   assert(continuation != NULL, "no handler found");
 381   return continuation;
 382 }
 383 
 384 JRT_ENTRY_NO_ASYNC(void, JVMCIRuntime::monitorenter(JavaThread* thread, oopDesc* obj, BasicLock* lock))
 385   IF_TRACE_jvmci_3 {
 386     char type[O_BUFLEN];
 387     obj->klass()->name()->as_C_string(type, O_BUFLEN);
 388     markOop mark = obj->mark();
 389     TRACE_jvmci_3("%s: entered locking slow case with obj=" INTPTR_FORMAT ", type=%s, mark=" INTPTR_FORMAT ", lock=" INTPTR_FORMAT, thread->name(), p2i(obj), type, p2i(mark), p2i(lock));
 390     tty->flush();
 391   }
 392   if (PrintBiasedLockingStatistics) {
 393     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
 394   }
 395   Handle h_obj(thread, obj);
 396   assert(oopDesc::is_oop(h_obj()), "must be NULL or an object");
 397   if (UseBiasedLocking) {
 398     // Retry fast entry if bias is revoked to avoid unnecessary inflation
 399     ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
 400   } else {
 401     if (JVMCIUseFastLocking) {
 402       // When using fast locking, the compiled code has already tried the fast case
 403       ObjectSynchronizer::slow_enter(h_obj, lock, THREAD);
 404     } else {
 405       ObjectSynchronizer::fast_enter(h_obj, lock, false, THREAD);
 406     }
 407   }
 408   TRACE_jvmci_3("%s: exiting locking slow with obj=" INTPTR_FORMAT, thread->name(), p2i(obj));
 409 JRT_END
 410 
 411 JRT_LEAF(void, JVMCIRuntime::monitorexit(JavaThread* thread, oopDesc* obj, BasicLock* lock))
 412   assert(thread == JavaThread::current(), "threads must correspond");
 413   assert(thread->last_Java_sp(), "last_Java_sp must be set");
 414   // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown
 415   EXCEPTION_MARK;
 416 
 417 #ifdef ASSERT
 418   if (!oopDesc::is_oop(obj)) {
 419     ResetNoHandleMark rhm;
 420     nmethod* method = thread->last_frame().cb()->as_nmethod_or_null();
 421     if (method != NULL) {
 422       tty->print_cr("ERROR in monitorexit in method %s wrong obj " INTPTR_FORMAT, method->name(), p2i(obj));
 423     }
 424     thread->print_stack_on(tty);
 425     assert(false, "invalid lock object pointer dected");
 426   }
 427 #endif
 428 
 429   if (JVMCIUseFastLocking) {
 430     // When using fast locking, the compiled code has already tried the fast case
 431     ObjectSynchronizer::slow_exit(obj, lock, THREAD);
 432   } else {
 433     ObjectSynchronizer::fast_exit(obj, lock, THREAD);
 434   }
 435   IF_TRACE_jvmci_3 {
 436     char type[O_BUFLEN];
 437     obj->klass()->name()->as_C_string(type, O_BUFLEN);
 438     TRACE_jvmci_3("%s: exited locking slow case with obj=" INTPTR_FORMAT ", type=%s, mark=" INTPTR_FORMAT ", lock=" INTPTR_FORMAT, thread->name(), p2i(obj), type, p2i(obj->mark()), p2i(lock));
 439     tty->flush();
 440   }
 441 JRT_END
 442 
 443 // Object.notify() fast path, caller does slow path
 444 JRT_LEAF(jboolean, JVMCIRuntime::object_notify(JavaThread *thread, oopDesc* obj))
 445 
 446   // Very few notify/notifyAll operations find any threads on the waitset, so
 447   // the dominant fast-path is to simply return.
 448   // Relatedly, it's critical that notify/notifyAll be fast in order to
 449   // reduce lock hold times.
 450   if (!SafepointSynchronize::is_synchronizing()) {
 451     if (ObjectSynchronizer::quick_notify(obj, thread, false)) {
 452       return true;
 453     }
 454   }
 455   return false; // caller must perform slow path
 456 
 457 JRT_END
 458 
 459 // Object.notifyAll() fast path, caller does slow path
 460 JRT_LEAF(jboolean, JVMCIRuntime::object_notifyAll(JavaThread *thread, oopDesc* obj))
 461 
 462   if (!SafepointSynchronize::is_synchronizing() ) {
 463     if (ObjectSynchronizer::quick_notify(obj, thread, true)) {
 464       return true;
 465     }
 466   }
 467   return false; // caller must perform slow path
 468 
 469 JRT_END
 470 
 471 JRT_ENTRY(void, JVMCIRuntime::throw_and_post_jvmti_exception(JavaThread* thread, const char* exception, const char* message))
 472   TempNewSymbol symbol = SymbolTable::new_symbol(exception);
 473   SharedRuntime::throw_and_post_jvmti_exception(thread, symbol, message);
 474 JRT_END
 475 
 476 JRT_ENTRY(void, JVMCIRuntime::throw_klass_external_name_exception(JavaThread* thread, const char* exception, Klass* klass))
 477   ResourceMark rm(thread);
 478   TempNewSymbol symbol = SymbolTable::new_symbol(exception);
 479   SharedRuntime::throw_and_post_jvmti_exception(thread, symbol, klass->external_name());
 480 JRT_END
 481 
 482 JRT_ENTRY(void, JVMCIRuntime::throw_class_cast_exception(JavaThread* thread, const char* exception, Klass* caster_klass, Klass* target_klass))
 483   ResourceMark rm(thread);
 484   const char* message = SharedRuntime::generate_class_cast_message(caster_klass, target_klass);
 485   TempNewSymbol symbol = SymbolTable::new_symbol(exception);
 486   SharedRuntime::throw_and_post_jvmti_exception(thread, symbol, message);
 487 JRT_END
 488 
 489 JRT_LEAF(void, JVMCIRuntime::log_object(JavaThread* thread, oopDesc* obj, bool as_string, bool newline))
 490   ttyLocker ttyl;
 491 
 492   if (obj == NULL) {
 493     tty->print("NULL");
 494   } else if (oopDesc::is_oop_or_null(obj, true) && (!as_string || !java_lang_String::is_instance(obj))) {
 495     if (oopDesc::is_oop_or_null(obj, true)) {
 496       char buf[O_BUFLEN];
 497       tty->print("%s@" INTPTR_FORMAT, obj->klass()->name()->as_C_string(buf, O_BUFLEN), p2i(obj));
 498     } else {
 499       tty->print(INTPTR_FORMAT, p2i(obj));
 500     }
 501   } else {
 502     ResourceMark rm;
 503     assert(obj != NULL && java_lang_String::is_instance(obj), "must be");
 504     char *buf = java_lang_String::as_utf8_string(obj);
 505     tty->print_raw(buf);
 506   }
 507   if (newline) {
 508     tty->cr();
 509   }
 510 JRT_END
 511 
 512 #if INCLUDE_G1GC
 513 
 514 JRT_LEAF(void, JVMCIRuntime::write_barrier_pre(JavaThread* thread, oopDesc* obj))
 515   G1ThreadLocalData::satb_mark_queue(thread).enqueue(obj);
 516 JRT_END
 517 
 518 JRT_LEAF(void, JVMCIRuntime::write_barrier_post(JavaThread* thread, void* card_addr))
 519   G1ThreadLocalData::dirty_card_queue(thread).enqueue(card_addr);
 520 JRT_END
 521 
 522 #endif // INCLUDE_G1GC
 523 
 524 JRT_LEAF(jboolean, JVMCIRuntime::validate_object(JavaThread* thread, oopDesc* parent, oopDesc* child))
 525   bool ret = true;
 526   if(!Universe::heap()->is_in(parent)) {
 527     tty->print_cr("Parent Object " INTPTR_FORMAT " not in heap", p2i(parent));
 528     parent->print();
 529     ret=false;
 530   }
 531   if(!Universe::heap()->is_in(child)) {
 532     tty->print_cr("Child Object " INTPTR_FORMAT " not in heap", p2i(child));
 533     child->print();
 534     ret=false;
 535   }
 536   return (jint)ret;
 537 JRT_END
 538 
 539 JRT_ENTRY(void, JVMCIRuntime::vm_error(JavaThread* thread, jlong where, jlong format, jlong value))
 540   ResourceMark rm;
 541   const char *error_msg = where == 0L ? "<internal JVMCI error>" : (char*) (address) where;
 542   char *detail_msg = NULL;
 543   if (format != 0L) {
 544     const char* buf = (char*) (address) format;
 545     size_t detail_msg_length = strlen(buf) * 2;
 546     detail_msg = (char *) NEW_RESOURCE_ARRAY(u_char, detail_msg_length);
 547     jio_snprintf(detail_msg, detail_msg_length, buf, value);
 548   }
 549   report_vm_error(__FILE__, __LINE__, error_msg, "%s", detail_msg);
 550 JRT_END
 551 
 552 JRT_LEAF(oopDesc*, JVMCIRuntime::load_and_clear_exception(JavaThread* thread))
 553   oop exception = thread->exception_oop();
 554   assert(exception != NULL, "npe");
 555   thread->set_exception_oop(NULL);
 556   thread->set_exception_pc(0);
 557   return exception;
 558 JRT_END
 559 
 560 PRAGMA_DIAG_PUSH
 561 PRAGMA_FORMAT_NONLITERAL_IGNORED
 562 JRT_LEAF(void, JVMCIRuntime::log_printf(JavaThread* thread, const char* format, jlong v1, jlong v2, jlong v3))
 563   ResourceMark rm;
 564   tty->print(format, v1, v2, v3);
 565 JRT_END
 566 PRAGMA_DIAG_POP
 567 
 568 static void decipher(jlong v, bool ignoreZero) {
 569   if (v != 0 || !ignoreZero) {
 570     void* p = (void *)(address) v;
 571     CodeBlob* cb = CodeCache::find_blob(p);
 572     if (cb) {
 573       if (cb->is_nmethod()) {
 574         char buf[O_BUFLEN];
 575         tty->print("%s [" INTPTR_FORMAT "+" JLONG_FORMAT "]", cb->as_nmethod_or_null()->method()->name_and_sig_as_C_string(buf, O_BUFLEN), p2i(cb->code_begin()), (jlong)((address)v - cb->code_begin()));
 576         return;
 577       }
 578       cb->print_value_on(tty);
 579       return;
 580     }
 581     if (Universe::heap()->is_in(p)) {
 582       oop obj = oop(p);
 583       obj->print_value_on(tty);
 584       return;
 585     }
 586     tty->print(INTPTR_FORMAT " [long: " JLONG_FORMAT ", double %lf, char %c]",p2i((void *)v), (jlong)v, (jdouble)v, (char)v);
 587   }
 588 }
 589 
 590 PRAGMA_DIAG_PUSH
 591 PRAGMA_FORMAT_NONLITERAL_IGNORED
 592 JRT_LEAF(void, JVMCIRuntime::vm_message(jboolean vmError, jlong format, jlong v1, jlong v2, jlong v3))
 593   ResourceMark rm;
 594   const char *buf = (const char*) (address) format;
 595   if (vmError) {
 596     if (buf != NULL) {
 597       fatal(buf, v1, v2, v3);
 598     } else {
 599       fatal("<anonymous error>");
 600     }
 601   } else if (buf != NULL) {
 602     tty->print(buf, v1, v2, v3);
 603   } else {
 604     assert(v2 == 0, "v2 != 0");
 605     assert(v3 == 0, "v3 != 0");
 606     decipher(v1, false);
 607   }
 608 JRT_END
 609 PRAGMA_DIAG_POP
 610 
 611 JRT_LEAF(void, JVMCIRuntime::log_primitive(JavaThread* thread, jchar typeChar, jlong value, jboolean newline))
 612   union {
 613       jlong l;
 614       jdouble d;
 615       jfloat f;
 616   } uu;
 617   uu.l = value;
 618   switch (typeChar) {
 619     case 'Z': tty->print(value == 0 ? "false" : "true"); break;
 620     case 'B': tty->print("%d", (jbyte) value); break;
 621     case 'C': tty->print("%c", (jchar) value); break;
 622     case 'S': tty->print("%d", (jshort) value); break;
 623     case 'I': tty->print("%d", (jint) value); break;
 624     case 'F': tty->print("%f", uu.f); break;
 625     case 'J': tty->print(JLONG_FORMAT, value); break;
 626     case 'D': tty->print("%lf", uu.d); break;
 627     default: assert(false, "unknown typeChar"); break;
 628   }
 629   if (newline) {
 630     tty->cr();
 631   }
 632 JRT_END
 633 
 634 JRT_ENTRY(jint, JVMCIRuntime::identity_hash_code(JavaThread* thread, oopDesc* obj))
 635   return (jint) obj->identity_hash();
 636 JRT_END
 637 
 638 JRT_ENTRY(jboolean, JVMCIRuntime::thread_is_interrupted(JavaThread* thread, oopDesc* receiver, jboolean clear_interrupted))
 639   Handle receiverHandle(thread, receiver);
 640   // A nested ThreadsListHandle may require the Threads_lock which
 641   // requires thread_in_vm which is why this method cannot be JRT_LEAF.
 642   ThreadsListHandle tlh;
 643 
 644   JavaThread* receiverThread = java_lang_Thread::thread(receiverHandle());
 645   if (receiverThread == NULL || (EnableThreadSMRExtraValidityChecks && !tlh.includes(receiverThread))) {
 646     // The other thread may exit during this process, which is ok so return false.
 647     return JNI_FALSE;
 648   } else {
 649     return (jint) Thread::is_interrupted(receiverThread, clear_interrupted != 0);
 650   }
 651 JRT_END
 652 
 653 JRT_ENTRY(jint, JVMCIRuntime::test_deoptimize_call_int(JavaThread* thread, int value))
 654   deopt_caller();
 655   return (jint) value;
 656 JRT_END
 657 
 658 
 659 // private static JVMCIRuntime JVMCI.initializeRuntime()
 660 JVM_ENTRY_NO_ENV(jobject, JVM_GetJVMCIRuntime(JNIEnv *env, jclass c))
 661   JNI_JVMCIENV(thread, env);
 662   if (!EnableJVMCI) {
 663     JVMCI_THROW_MSG_NULL(InternalError, "JVMCI is not enabled");
 664   }
 665   JVMCIENV->runtime()->initialize_HotSpotJVMCIRuntime(JVMCI_CHECK_NULL);
 666   JVMCIObject runtime = JVMCIENV->runtime()->get_HotSpotJVMCIRuntime(JVMCI_CHECK_NULL);
 667   return JVMCIENV->get_jobject(runtime);
 668 JVM_END
 669 
 670 void JVMCIRuntime::call_getCompiler(TRAPS) {
 671   THREAD_JVMCIENV(JavaThread::current());
 672   JVMCIObject jvmciRuntime = JVMCIRuntime::get_HotSpotJVMCIRuntime(JVMCI_CHECK);
 673   initialize(JVMCIENV);
 674   JVMCIENV->call_HotSpotJVMCIRuntime_getCompiler(jvmciRuntime, JVMCI_CHECK);
 675 }
 676 
 677 void JVMCINMethodData::initialize(
 678   int nmethod_mirror_index,
 679   const char* name,
 680   FailedSpeculation** failed_speculations)
 681 {
 682   _failed_speculations = failed_speculations;
 683   _nmethod_mirror_index = nmethod_mirror_index;
 684   if (name != NULL) {
 685     _has_name = true;
 686     char* dest = (char*) this->name();
 687     strcpy(dest, name);
 688   } else {
 689     _has_name = false;
 690   }
 691 }
 692 
 693 void JVMCINMethodData::add_failed_speculation(nmethod* nm, jlong speculation) {
 694   uint index = (speculation >> 32) & 0xFFFFFFFF;
 695   int length = (int) speculation;
 696   if (index + length > (uint) nm->speculations_size()) {
 697     fatal(INTPTR_FORMAT "[index: %d, length: %d] out of bounds wrt encoded speculations of length %u", speculation, index, length, nm->speculations_size());
 698   }
 699   address data = nm->speculations_begin() + index;
 700   FailedSpeculation::add_failed_speculation(nm, _failed_speculations, data, length);
 701 }
 702 
 703 oop JVMCINMethodData::get_nmethod_mirror(nmethod* nm) {
 704   if (_nmethod_mirror_index == -1) {
 705     return NULL;
 706   }
 707   return nm->oop_at(_nmethod_mirror_index);
 708 }
 709 
 710 void JVMCINMethodData::set_nmethod_mirror(nmethod* nm, oop new_mirror) {
 711   assert(_nmethod_mirror_index != -1, "cannot set JVMCI mirror for nmethod");
 712   oop* addr = nm->oop_addr_at(_nmethod_mirror_index);
 713   assert(new_mirror != NULL, "use clear_nmethod_mirror to clear the mirror");
 714   assert(*addr == NULL, "cannot overwrite non-null mirror");
 715 
 716   *addr = new_mirror;
 717 
 718   // Since we've patched some oops in the nmethod,
 719   // (re)register it with the heap.
 720   Universe::heap()->register_nmethod(nm);
 721 }
 722 
 723 void JVMCINMethodData::clear_nmethod_mirror(nmethod* nm) {
 724   if (_nmethod_mirror_index != -1) {
 725     oop* addr = nm->oop_addr_at(_nmethod_mirror_index);
 726     *addr = NULL;
 727   }
 728 }
 729 
 730 void JVMCINMethodData::invalidate_nmethod_mirror(nmethod* nm) {
 731   oop nmethod_mirror = get_nmethod_mirror(nm);
 732   if (nmethod_mirror == NULL) {
 733     return;
 734   }
 735 
 736   // Update the values in the mirror if it still refers to nm.
 737   // We cannot use JVMCIObject to wrap the mirror as this is called
 738   // during GC, forbidding the creation of JNIHandles.
 739   JVMCIEnv* jvmciEnv = NULL;
 740   nmethod* current = (nmethod*) HotSpotJVMCI::InstalledCode::address(jvmciEnv, nmethod_mirror);
 741   if (nm == current) {
 742     if (!nm->is_alive()) {
 743       // Break the link from the mirror to nm such that
 744       // future invocations via the mirror will result in
 745       // an InvalidInstalledCodeException.
 746       HotSpotJVMCI::InstalledCode::set_address(jvmciEnv, nmethod_mirror, 0);
 747       HotSpotJVMCI::InstalledCode::set_entryPoint(jvmciEnv, nmethod_mirror, 0);
 748     } else if (nm->is_not_entrant()) {
 749       // Zero the entry point so any new invocation will fail but keep
 750       // the address link around that so that existing activations can
 751       // be deoptimized via the mirror (i.e. JVMCIEnv::invalidate_installed_code).
 752       HotSpotJVMCI::InstalledCode::set_entryPoint(jvmciEnv, nmethod_mirror, 0);
 753     }
 754   }
 755 }
 756 
 757 void JVMCIRuntime::initialize_HotSpotJVMCIRuntime(JVMCI_TRAPS) {
 758   if (is_HotSpotJVMCIRuntime_initialized()) {
 759     if (JVMCIENV->is_hotspot() && UseJVMCINativeLibrary) {
 760       JVMCI_THROW_MSG(InternalError, "JVMCI has already been enabled in the JVMCI shared library");
 761     }
 762   }
 763 
 764   initialize(JVMCIENV);
 765 
 766   // This should only be called in the context of the JVMCI class being initialized
 767   JVMCIObject result = JVMCIENV->call_HotSpotJVMCIRuntime_runtime(JVMCI_CHECK);
 768 
 769   _HotSpotJVMCIRuntime_instance = JVMCIENV->make_global(result);
 770 }
 771 
 772 void JVMCIRuntime::initialize(JVMCIEnv* JVMCIENV) {
 773   assert(this != NULL, "sanity");
 774   // Check first without JVMCI_lock
 775   if (_initialized) {
 776     return;
 777   }
 778 
 779   MutexLocker locker(JVMCI_lock);
 780   // Check again under JVMCI_lock
 781   if (_initialized) {
 782     return;
 783   }
 784 
 785   while (_being_initialized) {
 786     JVMCI_lock->wait();
 787     if (_initialized) {
 788       return;
 789     }
 790   }
 791 
 792   _being_initialized = true;
 793 
 794   {
 795     MutexUnlocker unlock(JVMCI_lock);
 796 
 797     HandleMark hm;
 798     ResourceMark rm;
 799     JavaThread* THREAD = JavaThread::current();
 800     if (JVMCIENV->is_hotspot()) {
 801       HotSpotJVMCI::compute_offsets(CHECK_EXIT);
 802     } else {
 803       JNIAccessMark jni(JVMCIENV);
 804 
 805       JNIJVMCI::initialize_ids(jni.env());
 806       if (jni()->ExceptionCheck()) {
 807         jni()->ExceptionDescribe();
 808         fatal("JNI exception during init");
 809       }
 810     }
 811     create_jvmci_primitive_type(T_BOOLEAN, JVMCI_CHECK_EXIT_((void)0));
 812     create_jvmci_primitive_type(T_BYTE, JVMCI_CHECK_EXIT_((void)0));
 813     create_jvmci_primitive_type(T_CHAR, JVMCI_CHECK_EXIT_((void)0));
 814     create_jvmci_primitive_type(T_SHORT, JVMCI_CHECK_EXIT_((void)0));
 815     create_jvmci_primitive_type(T_INT, JVMCI_CHECK_EXIT_((void)0));
 816     create_jvmci_primitive_type(T_LONG, JVMCI_CHECK_EXIT_((void)0));
 817     create_jvmci_primitive_type(T_FLOAT, JVMCI_CHECK_EXIT_((void)0));
 818     create_jvmci_primitive_type(T_DOUBLE, JVMCI_CHECK_EXIT_((void)0));
 819     create_jvmci_primitive_type(T_VOID, JVMCI_CHECK_EXIT_((void)0));
 820 
 821     if (!JVMCIENV->is_hotspot()) {
 822       JVMCIENV->copy_saved_properties();
 823     }
 824   }
 825 
 826   _initialized = true;
 827   _being_initialized = false;
 828   JVMCI_lock->notify_all();
 829 }
 830 
 831 JVMCIObject JVMCIRuntime::create_jvmci_primitive_type(BasicType type, JVMCI_TRAPS) {
 832   Thread* THREAD = Thread::current();
 833   // These primitive types are long lived and are created before the runtime is fully set up
 834   // so skip registering them for scanning.
 835   JVMCIObject mirror = JVMCIENV->get_object_constant(java_lang_Class::primitive_mirror(type), false, true);
 836   if (JVMCIENV->is_hotspot()) {
 837     JavaValue result(T_OBJECT);
 838     JavaCallArguments args;
 839     args.push_oop(Handle(THREAD, HotSpotJVMCI::resolve(mirror)));
 840     args.push_int(type2char(type));
 841     JavaCalls::call_static(&result, HotSpotJVMCI::HotSpotResolvedPrimitiveType::klass(), vmSymbols::fromMetaspace_name(), vmSymbols::primitive_fromMetaspace_signature(), &args, CHECK_(JVMCIObject()));
 842 
 843     return JVMCIENV->wrap(JNIHandles::make_local((oop)result.get_jobject()));
 844   } else {
 845     JNIAccessMark jni(JVMCIENV);
 846     jobject result = jni()->CallStaticObjectMethod(JNIJVMCI::HotSpotResolvedPrimitiveType::clazz(),
 847                                            JNIJVMCI::HotSpotResolvedPrimitiveType_fromMetaspace_method(),
 848                                            mirror.as_jobject(), type2char(type));
 849     if (jni()->ExceptionCheck()) {
 850       return JVMCIObject();
 851     }
 852     return JVMCIENV->wrap(result);
 853   }
 854 }
 855 
 856 void JVMCIRuntime::initialize_JVMCI(JVMCI_TRAPS) {
 857   if (!is_HotSpotJVMCIRuntime_initialized()) {
 858     initialize(JVMCI_CHECK);
 859     JVMCIENV->call_JVMCI_getRuntime(JVMCI_CHECK);
 860   }
 861 }
 862 
 863 JVMCIObject JVMCIRuntime::get_HotSpotJVMCIRuntime(JVMCI_TRAPS) {
 864   initialize(JVMCIENV);
 865   initialize_JVMCI(JVMCI_CHECK_(JVMCIObject()));
 866   return _HotSpotJVMCIRuntime_instance;
 867 }
 868 
 869 
 870 // private void CompilerToVM.registerNatives()
 871 JVM_ENTRY_NO_ENV(void, JVM_RegisterJVMCINatives(JNIEnv *env, jclass c2vmClass))
 872 
 873 #ifdef _LP64
 874 #ifndef TARGET_ARCH_sparc
 875   uintptr_t heap_end = (uintptr_t) Universe::heap()->reserved_region().end();
 876   uintptr_t allocation_end = heap_end + ((uintptr_t)16) * 1024 * 1024 * 1024;
 877   guarantee(heap_end < allocation_end, "heap end too close to end of address space (might lead to erroneous TLAB allocations)");
 878 #endif // TARGET_ARCH_sparc
 879 #else
 880   fatal("check TLAB allocation code for address space conflicts");
 881 #endif
 882 
 883   JNI_JVMCIENV(thread, env);
 884 
 885   if (!EnableJVMCI) {
 886     JVMCI_THROW_MSG(InternalError, "JVMCI is not enabled");
 887   }
 888 
 889   JVMCIENV->runtime()->initialize(JVMCIENV);
 890 
 891   {
 892     ResourceMark rm;
 893     HandleMark hm(thread);
 894     ThreadToNativeFromVM trans(thread);
 895 
 896     // Ensure _non_oop_bits is initialized
 897     Universe::non_oop_word();
 898 
 899     if (JNI_OK != env->RegisterNatives(c2vmClass, CompilerToVM::methods, CompilerToVM::methods_count())) {
 900       if (!env->ExceptionCheck()) {
 901         for (int i = 0; i < CompilerToVM::methods_count(); i++) {
 902           if (JNI_OK != env->RegisterNatives(c2vmClass, CompilerToVM::methods + i, 1)) {
 903             guarantee(false, "Error registering JNI method %s%s", CompilerToVM::methods[i].name, CompilerToVM::methods[i].signature);
 904             break;
 905           }
 906         }
 907       } else {
 908         env->ExceptionDescribe();
 909       }
 910       guarantee(false, "Failed registering CompilerToVM native methods");
 911     }
 912   }
 913 JVM_END
 914 
 915 
 916 void JVMCIRuntime::shutdown() {
 917   if (is_HotSpotJVMCIRuntime_initialized()) {
 918     _shutdown_called = true;
 919 
 920     THREAD_JVMCIENV(JavaThread::current());
 921     JVMCIENV->call_HotSpotJVMCIRuntime_shutdown(_HotSpotJVMCIRuntime_instance);
 922   }
 923 }
 924 
 925 void JVMCIRuntime::bootstrap_finished(TRAPS) {
 926   if (is_HotSpotJVMCIRuntime_initialized()) {
 927     THREAD_JVMCIENV(JavaThread::current());
 928     JVMCIENV->call_HotSpotJVMCIRuntime_bootstrapFinished(_HotSpotJVMCIRuntime_instance, JVMCIENV);
 929   }
 930 }
 931 
 932 void JVMCIRuntime::describe_pending_hotspot_exception(JavaThread* THREAD, bool clear) {
 933   if (HAS_PENDING_EXCEPTION) {
 934     Handle exception(THREAD, PENDING_EXCEPTION);
 935     const char* exception_file = THREAD->exception_file();
 936     int exception_line = THREAD->exception_line();
 937     CLEAR_PENDING_EXCEPTION;
 938     if (exception->is_a(SystemDictionary::ThreadDeath_klass())) {
 939       // Don't print anything if we are being killed.
 940     } else {
 941       java_lang_Throwable::print(exception(), tty);
 942       tty->cr();
 943       java_lang_Throwable::print_stack_trace(exception, tty);
 944 
 945       // Clear and ignore any exceptions raised during printing
 946       CLEAR_PENDING_EXCEPTION;
 947     }
 948     if (!clear) {
 949       THREAD->set_pending_exception(exception(), exception_file, exception_line);
 950     }
 951   }
 952 }
 953 
 954 
 955 void JVMCIRuntime::exit_on_pending_exception(JVMCIEnv* JVMCIENV, const char* message) {
 956   JavaThread* THREAD = JavaThread::current();
 957 
 958   static volatile int report_error = 0;
 959   if (!report_error && Atomic::cmpxchg(1, &report_error, 0) == 0) {
 960     // Only report an error once
 961     tty->print_raw_cr(message);
 962     if (JVMCIENV != NULL) {
 963       JVMCIENV->describe_pending_exception(true);
 964     } else {
 965       describe_pending_hotspot_exception(THREAD, true);
 966     }
 967   } else {
 968     // Allow error reporting thread to print the stack trace.  Windows
 969     // doesn't allow uninterruptible wait for JavaThreads
 970     const bool interruptible = true;
 971     os::sleep(THREAD, 200, interruptible);
 972   }
 973 
 974   before_exit(THREAD);
 975   vm_exit(-1);
 976 }
 977 
 978 // ------------------------------------------------------------------
 979 // Note: the logic of this method should mirror the logic of
 980 // constantPoolOopDesc::verify_constant_pool_resolve.
 981 bool JVMCIRuntime::check_klass_accessibility(Klass* accessing_klass, Klass* resolved_klass) {
 982   if (accessing_klass->is_objArray_klass()) {
 983     accessing_klass = ObjArrayKlass::cast(accessing_klass)->bottom_klass();
 984   }
 985   if (!accessing_klass->is_instance_klass()) {
 986     return true;
 987   }
 988 
 989   if (resolved_klass->is_objArray_klass()) {
 990     // Find the element klass, if this is an array.
 991     resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass();
 992   }
 993   if (resolved_klass->is_instance_klass()) {
 994     Reflection::VerifyClassAccessResults result =
 995       Reflection::verify_class_access(accessing_klass, InstanceKlass::cast(resolved_klass), true);
 996     return result == Reflection::ACCESS_OK;
 997   }
 998   return true;
 999 }
1000 
1001 // ------------------------------------------------------------------
1002 Klass* JVMCIRuntime::get_klass_by_name_impl(Klass*& accessing_klass,
1003                                           const constantPoolHandle& cpool,
1004                                           Symbol* sym,
1005                                           bool require_local) {
1006   JVMCI_EXCEPTION_CONTEXT;
1007 
1008   // Now we need to check the SystemDictionary
1009   if (sym->char_at(0) == 'L' &&
1010     sym->char_at(sym->utf8_length()-1) == ';') {
1011     // This is a name from a signature.  Strip off the trimmings.
1012     // Call recursive to keep scope of strippedsym.
1013     TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1,
1014                                                         sym->utf8_length()-2);
1015     return get_klass_by_name_impl(accessing_klass, cpool, strippedsym, require_local);
1016   }
1017 
1018   Handle loader(THREAD, (oop)NULL);
1019   Handle domain(THREAD, (oop)NULL);
1020   if (accessing_klass != NULL) {
1021     loader = Handle(THREAD, accessing_klass->class_loader());
1022     domain = Handle(THREAD, accessing_klass->protection_domain());
1023   }
1024 
1025   Klass* found_klass;
1026   {
1027     ttyUnlocker ttyul;  // release tty lock to avoid ordering problems
1028     MutexLocker ml(Compile_lock);
1029     if (!require_local) {
1030       found_klass = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, CHECK_NULL);
1031     } else {
1032       found_klass = SystemDictionary::find_instance_or_array_klass(sym, loader, domain, CHECK_NULL);
1033     }
1034   }
1035 
1036   // If we fail to find an array klass, look again for its element type.
1037   // The element type may be available either locally or via constraints.
1038   // In either case, if we can find the element type in the system dictionary,
1039   // we must build an array type around it.  The CI requires array klasses
1040   // to be loaded if their element klasses are loaded, except when memory
1041   // is exhausted.
1042   if (sym->char_at(0) == '[' &&
1043       (sym->char_at(1) == '[' || sym->char_at(1) == 'L')) {
1044     // We have an unloaded array.
1045     // Build it on the fly if the element class exists.
1046     TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1,
1047                                                      sym->utf8_length()-1);
1048 
1049     // Get element Klass recursively.
1050     Klass* elem_klass =
1051       get_klass_by_name_impl(accessing_klass,
1052                              cpool,
1053                              elem_sym,
1054                              require_local);
1055     if (elem_klass != NULL) {
1056       // Now make an array for it
1057       return elem_klass->array_klass(THREAD);
1058     }
1059   }
1060 
1061   if (found_klass == NULL && !cpool.is_null() && cpool->has_preresolution()) {
1062     // Look inside the constant pool for pre-resolved class entries.
1063     for (int i = cpool->length() - 1; i >= 1; i--) {
1064       if (cpool->tag_at(i).is_klass()) {
1065         Klass*  kls = cpool->resolved_klass_at(i);
1066         if (kls->name() == sym) {
1067           return kls;
1068         }
1069       }
1070     }
1071   }
1072 
1073   return found_klass;
1074 }
1075 
1076 // ------------------------------------------------------------------
1077 Klass* JVMCIRuntime::get_klass_by_name(Klass* accessing_klass,
1078                                   Symbol* klass_name,
1079                                   bool require_local) {
1080   ResourceMark rm;
1081   constantPoolHandle cpool;
1082   return get_klass_by_name_impl(accessing_klass,
1083                                                  cpool,
1084                                                  klass_name,
1085                                                  require_local);
1086 }
1087 
1088 // ------------------------------------------------------------------
1089 // Implementation of get_klass_by_index.
1090 Klass* JVMCIRuntime::get_klass_by_index_impl(const constantPoolHandle& cpool,
1091                                         int index,
1092                                         bool& is_accessible,
1093                                         Klass* accessor) {
1094   JVMCI_EXCEPTION_CONTEXT;
1095   Klass* klass = ConstantPool::klass_at_if_loaded(cpool, index);
1096   Symbol* klass_name = NULL;
1097   if (klass == NULL) {
1098     klass_name = cpool->klass_name_at(index);
1099   }
1100 
1101   if (klass == NULL) {
1102     // Not found in constant pool.  Use the name to do the lookup.
1103     Klass* k = get_klass_by_name_impl(accessor,
1104                                         cpool,
1105                                         klass_name,
1106                                         false);
1107     // Calculate accessibility the hard way.
1108     if (k == NULL) {
1109       is_accessible = false;
1110     } else if (k->class_loader() != accessor->class_loader() &&
1111                get_klass_by_name_impl(accessor, cpool, k->name(), true) == NULL) {
1112       // Loaded only remotely.  Not linked yet.
1113       is_accessible = false;
1114     } else {
1115       // Linked locally, and we must also check public/private, etc.
1116       is_accessible = check_klass_accessibility(accessor, k);
1117     }
1118     if (!is_accessible) {
1119       return NULL;
1120     }
1121     return k;
1122   }
1123 
1124   // It is known to be accessible, since it was found in the constant pool.
1125   is_accessible = true;
1126   return klass;
1127 }
1128 
1129 // ------------------------------------------------------------------
1130 // Get a klass from the constant pool.
1131 Klass* JVMCIRuntime::get_klass_by_index(const constantPoolHandle& cpool,
1132                                    int index,
1133                                    bool& is_accessible,
1134                                    Klass* accessor) {
1135   ResourceMark rm;
1136   Klass* result = get_klass_by_index_impl(cpool, index, is_accessible, accessor);
1137   return result;
1138 }
1139 
1140 // ------------------------------------------------------------------
1141 // Implementation of get_field_by_index.
1142 //
1143 // Implementation note: the results of field lookups are cached
1144 // in the accessor klass.
1145 void JVMCIRuntime::get_field_by_index_impl(InstanceKlass* klass, fieldDescriptor& field_desc,
1146                                         int index) {
1147   JVMCI_EXCEPTION_CONTEXT;
1148 
1149   assert(klass->is_linked(), "must be linked before using its constant-pool");
1150 
1151   constantPoolHandle cpool(thread, klass->constants());
1152 
1153   // Get the field's name, signature, and type.
1154   Symbol* name  = cpool->name_ref_at(index);
1155 
1156   int nt_index = cpool->name_and_type_ref_index_at(index);
1157   int sig_index = cpool->signature_ref_index_at(nt_index);
1158   Symbol* signature = cpool->symbol_at(sig_index);
1159 
1160   // Get the field's declared holder.
1161   int holder_index = cpool->klass_ref_index_at(index);
1162   bool holder_is_accessible;
1163   Klass* declared_holder = get_klass_by_index(cpool, holder_index,
1164                                                holder_is_accessible,
1165                                                klass);
1166 
1167   // The declared holder of this field may not have been loaded.
1168   // Bail out with partial field information.
1169   if (!holder_is_accessible) {
1170     return;
1171   }
1172 
1173 
1174   // Perform the field lookup.
1175   Klass*  canonical_holder =
1176     InstanceKlass::cast(declared_holder)->find_field(name, signature, &field_desc);
1177   if (canonical_holder == NULL) {
1178     return;
1179   }
1180 
1181   assert(canonical_holder == field_desc.field_holder(), "just checking");
1182 }
1183 
1184 // ------------------------------------------------------------------
1185 // Get a field by index from a klass's constant pool.
1186 void JVMCIRuntime::get_field_by_index(InstanceKlass* accessor, fieldDescriptor& fd, int index) {
1187   ResourceMark rm;
1188   return get_field_by_index_impl(accessor, fd, index);
1189 }
1190 
1191 // ------------------------------------------------------------------
1192 // Perform an appropriate method lookup based on accessor, holder,
1193 // name, signature, and bytecode.
1194 methodHandle JVMCIRuntime::lookup_method(InstanceKlass* accessor,
1195                                Klass*        holder,
1196                                Symbol*       name,
1197                                Symbol*       sig,
1198                                Bytecodes::Code bc,
1199                                constantTag   tag) {
1200   // Accessibility checks are performed in JVMCIEnv::get_method_by_index_impl().
1201   assert(check_klass_accessibility(accessor, holder), "holder not accessible");
1202 
1203   methodHandle dest_method;
1204   LinkInfo link_info(holder, name, sig, accessor, LinkInfo::needs_access_check, tag);
1205   switch (bc) {
1206   case Bytecodes::_invokestatic:
1207     dest_method =
1208       LinkResolver::resolve_static_call_or_null(link_info);
1209     break;
1210   case Bytecodes::_invokespecial:
1211     dest_method =
1212       LinkResolver::resolve_special_call_or_null(link_info);
1213     break;
1214   case Bytecodes::_invokeinterface:
1215     dest_method =
1216       LinkResolver::linktime_resolve_interface_method_or_null(link_info);
1217     break;
1218   case Bytecodes::_invokevirtual:
1219     dest_method =
1220       LinkResolver::linktime_resolve_virtual_method_or_null(link_info);
1221     break;
1222   default: ShouldNotReachHere();
1223   }
1224 
1225   return dest_method;
1226 }
1227 
1228 
1229 // ------------------------------------------------------------------
1230 methodHandle JVMCIRuntime::get_method_by_index_impl(const constantPoolHandle& cpool,
1231                                           int index, Bytecodes::Code bc,
1232                                           InstanceKlass* accessor) {
1233   if (bc == Bytecodes::_invokedynamic) {
1234     ConstantPoolCacheEntry* cpce = cpool->invokedynamic_cp_cache_entry_at(index);
1235     bool is_resolved = !cpce->is_f1_null();
1236     if (is_resolved) {
1237       // Get the invoker Method* from the constant pool.
1238       // (The appendix argument, if any, will be noted in the method's signature.)
1239       Method* adapter = cpce->f1_as_method();
1240       return methodHandle(adapter);
1241     }
1242 
1243     return NULL;
1244   }
1245 
1246   int holder_index = cpool->klass_ref_index_at(index);
1247   bool holder_is_accessible;
1248   Klass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
1249 
1250   // Get the method's name and signature.
1251   Symbol* name_sym = cpool->name_ref_at(index);
1252   Symbol* sig_sym  = cpool->signature_ref_at(index);
1253 
1254   if (cpool->has_preresolution()
1255       || ((holder == SystemDictionary::MethodHandle_klass() || holder == SystemDictionary::VarHandle_klass()) &&
1256           MethodHandles::is_signature_polymorphic_name(holder, name_sym))) {
1257     // Short-circuit lookups for JSR 292-related call sites.
1258     // That is, do not rely only on name-based lookups, because they may fail
1259     // if the names are not resolvable in the boot class loader (7056328).
1260     switch (bc) {
1261     case Bytecodes::_invokevirtual:
1262     case Bytecodes::_invokeinterface:
1263     case Bytecodes::_invokespecial:
1264     case Bytecodes::_invokestatic:
1265       {
1266         Method* m = ConstantPool::method_at_if_loaded(cpool, index);
1267         if (m != NULL) {
1268           return m;
1269         }
1270       }
1271       break;
1272     default:
1273       break;
1274     }
1275   }
1276 
1277   if (holder_is_accessible) { // Our declared holder is loaded.
1278     constantTag tag = cpool->tag_ref_at(index);
1279     methodHandle m = lookup_method(accessor, holder, name_sym, sig_sym, bc, tag);
1280     if (!m.is_null()) {
1281       // We found the method.
1282       return m;
1283     }
1284   }
1285 
1286   // Either the declared holder was not loaded, or the method could
1287   // not be found.
1288 
1289   return NULL;
1290 }
1291 
1292 // ------------------------------------------------------------------
1293 InstanceKlass* JVMCIRuntime::get_instance_klass_for_declared_method_holder(Klass* method_holder) {
1294   // For the case of <array>.clone(), the method holder can be an ArrayKlass*
1295   // instead of an InstanceKlass*.  For that case simply pretend that the
1296   // declared holder is Object.clone since that's where the call will bottom out.
1297   if (method_holder->is_instance_klass()) {
1298     return InstanceKlass::cast(method_holder);
1299   } else if (method_holder->is_array_klass()) {
1300     return InstanceKlass::cast(SystemDictionary::Object_klass());
1301   } else {
1302     ShouldNotReachHere();
1303   }
1304   return NULL;
1305 }
1306 
1307 
1308 // ------------------------------------------------------------------
1309 methodHandle JVMCIRuntime::get_method_by_index(const constantPoolHandle& cpool,
1310                                      int index, Bytecodes::Code bc,
1311                                      InstanceKlass* accessor) {
1312   ResourceMark rm;
1313   return get_method_by_index_impl(cpool, index, bc, accessor);
1314 }
1315 
1316 // ------------------------------------------------------------------
1317 // Check for changes to the system dictionary during compilation
1318 // class loads, evolution, breakpoints
1319 JVMCI::CodeInstallResult JVMCIRuntime::validate_compile_task_dependencies(Dependencies* dependencies, JVMCICompileState* compile_state, char** failure_detail) {
1320   // If JVMTI capabilities were enabled during compile, the compilation is invalidated.
1321   if (compile_state != NULL && compile_state->jvmti_state_changed()) {
1322     *failure_detail = (char*) "Jvmti state change during compilation invalidated dependencies";
1323     return JVMCI::dependencies_failed;
1324   }
1325 
1326   // Dependencies must be checked when the system dictionary changes
1327   // or if we don't know whether it has changed (i.e., compile_state == NULL).
1328   bool counter_changed = compile_state == NULL || compile_state->system_dictionary_modification_counter() != SystemDictionary::number_of_modifications();
1329   CompileTask* task = compile_state == NULL ? NULL : compile_state->task();
1330   Dependencies::DepType result = dependencies->validate_dependencies(task, counter_changed, failure_detail);
1331   if (result == Dependencies::end_marker) {
1332     return JVMCI::ok;
1333   }
1334 
1335   if (!Dependencies::is_klass_type(result) || counter_changed) {
1336     return JVMCI::dependencies_failed;
1337   }
1338   // The dependencies were invalid at the time of installation
1339   // without any intervening modification of the system
1340   // dictionary.  That means they were invalidly constructed.
1341   return JVMCI::dependencies_invalid;
1342 }
1343 
1344 
1345 void JVMCIRuntime::compile_method(JVMCIEnv* JVMCIENV, JVMCICompiler* compiler, const methodHandle& method, int entry_bci) {
1346   JVMCI_EXCEPTION_CONTEXT
1347 
1348   JVMCICompileState* compile_state = JVMCIENV->compile_state();
1349 
1350   bool is_osr = entry_bci != InvocationEntryBci;
1351   if (compiler->is_bootstrapping() && is_osr) {
1352     // no OSR compilations during bootstrap - the compiler is just too slow at this point,
1353     // and we know that there are no endless loops
1354     compile_state->set_failure(true, "No OSR during boostrap");
1355     return;
1356   }
1357   if (JVMCI::shutdown_called()) {
1358     compile_state->set_failure(false, "Avoiding compilation during shutdown");
1359     return;
1360   }
1361 
1362   HandleMark hm;
1363   JVMCIObject receiver = get_HotSpotJVMCIRuntime(JVMCIENV);
1364   if (JVMCIENV->has_pending_exception()) {
1365     JVMCIENV->describe_pending_exception(true);
1366     compile_state->set_failure(false, "exception getting HotSpotJVMCIRuntime object");
1367     return;
1368   }
1369   JVMCIObject jvmci_method = JVMCIENV->get_jvmci_method(method, JVMCIENV);
1370   if (JVMCIENV->has_pending_exception()) {
1371     JVMCIENV->describe_pending_exception(true);
1372     compile_state->set_failure(false, "exception getting JVMCI wrapper method");
1373     return;
1374   }
1375 
1376   JVMCIObject result_object = JVMCIENV->call_HotSpotJVMCIRuntime_compileMethod(receiver, jvmci_method, entry_bci,
1377                                                                      (jlong) compile_state, compile_state->task()->compile_id());
1378   if (!JVMCIENV->has_pending_exception()) {
1379     if (result_object.is_non_null()) {
1380       JVMCIObject failure_message = JVMCIENV->get_HotSpotCompilationRequestResult_failureMessage(result_object);
1381       if (failure_message.is_non_null()) {
1382         // Copy failure reason into resource memory first ...
1383         const char* failure_reason = JVMCIENV->as_utf8_string(failure_message);
1384         // ... and then into the C heap.
1385         failure_reason = os::strdup(failure_reason, mtJVMCI);
1386         bool retryable = JVMCIENV->get_HotSpotCompilationRequestResult_retry(result_object) != 0;
1387         compile_state->set_failure(retryable, failure_reason, true);
1388       } else {
1389         if (compile_state->task()->code() == NULL) {
1390           compile_state->set_failure(true, "no nmethod produced");
1391         } else {
1392           compile_state->task()->set_num_inlined_bytecodes(JVMCIENV->get_HotSpotCompilationRequestResult_inlinedBytecodes(result_object));
1393           compiler->inc_methods_compiled();
1394         }
1395       }
1396     } else {
1397       assert(false, "JVMCICompiler.compileMethod should always return non-null");
1398     }
1399   } else {
1400     // An uncaught exception was thrown during compilation. Generally these
1401     // should be handled by the Java code in some useful way but if they leak
1402     // through to here report them instead of dying or silently ignoring them.
1403     JVMCIENV->describe_pending_exception(true);
1404     compile_state->set_failure(false, "unexpected exception thrown");
1405   }
1406   if (compiler->is_bootstrapping()) {
1407     compiler->set_bootstrap_compilation_request_handled();
1408   }
1409 }
1410 
1411 
1412 // ------------------------------------------------------------------
1413 JVMCI::CodeInstallResult JVMCIRuntime::register_method(JVMCIEnv* JVMCIENV,
1414                                 const methodHandle& method,
1415                                 nmethod*& nm,
1416                                 int entry_bci,
1417                                 CodeOffsets* offsets,
1418                                 int orig_pc_offset,
1419                                 CodeBuffer* code_buffer,
1420                                 int frame_words,
1421                                 OopMapSet* oop_map_set,
1422                                 ExceptionHandlerTable* handler_table,
1423                                 AbstractCompiler* compiler,
1424                                 DebugInformationRecorder* debug_info,
1425                                 Dependencies* dependencies,
1426                                 int compile_id,
1427                                 bool has_unsafe_access,
1428                                 bool has_wide_vector,
1429                                 JVMCIObject compiled_code,
1430                                 JVMCIObject nmethod_mirror,
1431                                 FailedSpeculation** failed_speculations,
1432                                 char* speculations,
1433                                 int speculations_len) {
1434   JVMCI_EXCEPTION_CONTEXT;
1435   nm = NULL;
1436   int comp_level = CompLevel_full_optimization;
1437   char* failure_detail = NULL;
1438 
1439   bool install_default = JVMCIENV->get_HotSpotNmethod_isDefault(nmethod_mirror) != 0;
1440   assert(JVMCIENV->isa_HotSpotNmethod(nmethod_mirror), "must be");
1441   JVMCIObject name = JVMCIENV->get_InstalledCode_name(nmethod_mirror);
1442   const char* nmethod_mirror_name = name.is_null() ? NULL : JVMCIENV->as_utf8_string(name);
1443   int nmethod_mirror_index;
1444   if (!install_default) {
1445     // Reserve or initialize mirror slot in the oops table.
1446     OopRecorder* oop_recorder = debug_info->oop_recorder();
1447     nmethod_mirror_index = oop_recorder->allocate_oop_index(nmethod_mirror.is_hotspot() ? nmethod_mirror.as_jobject() : NULL);
1448   } else {
1449     // A default HotSpotNmethod mirror is never tracked by the nmethod
1450     nmethod_mirror_index = -1;
1451   }
1452 
1453   JVMCI::CodeInstallResult result;
1454   {
1455     // To prevent compile queue updates.
1456     MutexLocker locker(MethodCompileQueue_lock, THREAD);
1457 
1458     // Prevent SystemDictionary::add_to_hierarchy from running
1459     // and invalidating our dependencies until we install this method.
1460     MutexLocker ml(Compile_lock);
1461 
1462     // Encode the dependencies now, so we can check them right away.
1463     dependencies->encode_content_bytes();
1464 
1465     // Record the dependencies for the current compile in the log
1466     if (LogCompilation) {
1467       for (Dependencies::DepStream deps(dependencies); deps.next(); ) {
1468         deps.log_dependency();
1469       }
1470     }
1471 
1472     // Check for {class loads, evolution, breakpoints} during compilation
1473     result = validate_compile_task_dependencies(dependencies, JVMCIENV->compile_state(), &failure_detail);
1474     if (result != JVMCI::ok) {
1475       // While not a true deoptimization, it is a preemptive decompile.
1476       MethodData* mdp = method()->method_data();
1477       if (mdp != NULL) {
1478         mdp->inc_decompile_count();
1479 #ifdef ASSERT
1480         if (mdp->decompile_count() > (uint)PerMethodRecompilationCutoff) {
1481           ResourceMark m;
1482           tty->print_cr("WARN: endless recompilation of %s. Method was set to not compilable.", method()->name_and_sig_as_C_string());
1483         }
1484 #endif
1485       }
1486 
1487       // All buffers in the CodeBuffer are allocated in the CodeCache.
1488       // If the code buffer is created on each compile attempt
1489       // as in C2, then it must be freed.
1490       //code_buffer->free_blob();
1491     } else {
1492       ImplicitExceptionTable implicit_tbl;
1493       nm =  nmethod::new_nmethod(method,
1494                                  compile_id,
1495                                  entry_bci,
1496                                  offsets,
1497                                  orig_pc_offset,
1498                                  debug_info, dependencies, code_buffer,
1499                                  frame_words, oop_map_set,
1500                                  handler_table, &implicit_tbl,
1501                                  compiler, comp_level,
1502                                  speculations, speculations_len,
1503                                  nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
1504 
1505 
1506       // Free codeBlobs
1507       if (nm == NULL) {
1508         // The CodeCache is full.  Print out warning and disable compilation.
1509         {
1510           MutexUnlocker ml(Compile_lock);
1511           MutexUnlocker locker(MethodCompileQueue_lock);
1512           CompileBroker::handle_full_code_cache(CodeCache::get_code_blob_type(comp_level));
1513         }
1514       } else {
1515         nm->set_has_unsafe_access(has_unsafe_access);
1516         nm->set_has_wide_vectors(has_wide_vector);
1517 
1518         // Record successful registration.
1519         // (Put nm into the task handle *before* publishing to the Java heap.)
1520         if (JVMCIENV->compile_state() != NULL) {
1521           JVMCIENV->compile_state()->task()->set_code(nm);
1522         }
1523 
1524         JVMCINMethodData* data = nm->jvmci_nmethod_data();
1525         assert(data != NULL, "must be");
1526         if (install_default) {
1527           assert(!nmethod_mirror.is_hotspot() || data->get_nmethod_mirror(nm) == NULL, "must be");
1528           if (entry_bci == InvocationEntryBci) {
1529             if (TieredCompilation) {
1530               // If there is an old version we're done with it
1531               CompiledMethod* old = method->code();
1532               if (TraceMethodReplacement && old != NULL) {
1533                 ResourceMark rm;
1534                 char *method_name = method->name_and_sig_as_C_string();
1535                 tty->print_cr("Replacing method %s", method_name);
1536               }
1537               if (old != NULL ) {
1538                 old->make_not_entrant();
1539               }
1540             }
1541             if (TraceNMethodInstalls) {
1542               ResourceMark rm;
1543               char *method_name = method->name_and_sig_as_C_string();
1544               ttyLocker ttyl;
1545               tty->print_cr("Installing method (%d) %s [entry point: %p]",
1546                             comp_level,
1547                             method_name, nm->entry_point());
1548             }
1549             // Allow the code to be executed
1550             method->set_code(method, nm);
1551           } else {
1552             if (TraceNMethodInstalls ) {
1553               ResourceMark rm;
1554               char *method_name = method->name_and_sig_as_C_string();
1555               ttyLocker ttyl;
1556               tty->print_cr("Installing osr method (%d) %s @ %d",
1557                             comp_level,
1558                             method_name,
1559                             entry_bci);
1560             }
1561             InstanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
1562           }
1563         } else {
1564           assert(!nmethod_mirror.is_hotspot() || data->get_nmethod_mirror(nm) == HotSpotJVMCI::resolve(nmethod_mirror), "must be");
1565         }
1566         nm->make_in_use();
1567       }
1568       result = nm != NULL ? JVMCI::ok :JVMCI::cache_full;
1569     }
1570   }
1571 
1572   // String creation must be done outside lock
1573   if (failure_detail != NULL) {
1574     // A failure to allocate the string is silently ignored.
1575     JVMCIObject message = JVMCIENV->create_string(failure_detail, JVMCIENV);
1576     JVMCIENV->set_HotSpotCompiledNmethod_installationFailureMessage(compiled_code, message);
1577   }
1578 
1579   // JVMTI -- compiled method notification (must be done outside lock)
1580   if (nm != NULL) {
1581     nm->post_compiled_method_load_event();
1582   }
1583 
1584   return result;
1585 }