1 /*
   2  * Copyright (c) 1997, 2012, 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 "compiler/compileBroker.hpp"
  29 #include "gc_interface/collectedHeap.hpp"
  30 #include "interpreter/interpreter.hpp"
  31 #include "interpreter/interpreterRuntime.hpp"
  32 #include "interpreter/linkResolver.hpp"
  33 #include "interpreter/templateTable.hpp"
  34 #include "memory/oopFactory.hpp"
  35 #include "memory/universe.inline.hpp"
  36 #include "oops/constantPoolOop.hpp"
  37 #include "oops/cpCacheOop.hpp"
  38 #include "oops/instanceKlass.hpp"
  39 #include "oops/methodDataOop.hpp"
  40 #include "oops/objArrayKlass.hpp"
  41 #include "oops/oop.inline.hpp"
  42 #include "oops/symbol.hpp"
  43 #include "prims/jvmtiExport.hpp"
  44 #include "prims/nativeLookup.hpp"
  45 #include "runtime/biasedLocking.hpp"
  46 #include "runtime/compilationPolicy.hpp"
  47 #include "runtime/deoptimization.hpp"
  48 #include "runtime/fieldDescriptor.hpp"
  49 #include "runtime/handles.inline.hpp"
  50 #include "runtime/interfaceSupport.hpp"
  51 #include "runtime/java.hpp"
  52 #include "runtime/jfieldIDWorkaround.hpp"
  53 #include "runtime/osThread.hpp"
  54 #include "runtime/sharedRuntime.hpp"
  55 #include "runtime/stubRoutines.hpp"
  56 #include "runtime/synchronizer.hpp"
  57 #include "runtime/threadCritical.hpp"
  58 #include "utilities/events.hpp"
  59 #ifdef TARGET_ARCH_x86
  60 # include "vm_version_x86.hpp"
  61 #endif
  62 #ifdef TARGET_ARCH_sparc
  63 # include "vm_version_sparc.hpp"
  64 #endif
  65 #ifdef TARGET_ARCH_zero
  66 # include "vm_version_zero.hpp"
  67 #endif
  68 #ifdef TARGET_ARCH_arm
  69 # include "vm_version_arm.hpp"
  70 #endif
  71 #ifdef TARGET_ARCH_ppc
  72 # include "vm_version_ppc.hpp"
  73 #endif
  74 #ifdef COMPILER2
  75 #include "opto/runtime.hpp"
  76 #endif
  77 
  78 class UnlockFlagSaver {
  79   private:
  80     JavaThread* _thread;
  81     bool _do_not_unlock;
  82   public:
  83     UnlockFlagSaver(JavaThread* t) {
  84       _thread = t;
  85       _do_not_unlock = t->do_not_unlock_if_synchronized();
  86       t->set_do_not_unlock_if_synchronized(false);
  87     }
  88     ~UnlockFlagSaver() {
  89       _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
  90     }
  91 };
  92 
  93 //------------------------------------------------------------------------------------------------------------------------
  94 // State accessors
  95 
  96 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
  97   last_frame(thread).interpreter_frame_set_bcp(bcp);
  98   if (ProfileInterpreter) {
  99     // ProfileTraps uses MDOs independently of ProfileInterpreter.
 100     // That is why we must check both ProfileInterpreter and mdo != NULL.
 101     methodDataOop mdo = last_frame(thread).interpreter_frame_method()->method_data();
 102     if (mdo != NULL) {
 103       NEEDS_CLEANUP;
 104       last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
 105     }
 106   }
 107 }
 108 
 109 //------------------------------------------------------------------------------------------------------------------------
 110 // Constants
 111 
 112 
 113 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
 114   // access constant pool
 115   constantPoolOop pool = method(thread)->constants();
 116   int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
 117   constantTag tag = pool->tag_at(index);
 118 
 119   if (tag.is_unresolved_klass() || tag.is_klass()) {
 120     klassOop klass = pool->klass_at(index, CHECK);
 121     oop java_class = klass->java_mirror();
 122     thread->set_vm_result(java_class);
 123   } else {
 124 #ifdef ASSERT
 125     // If we entered this runtime routine, we believed the tag contained
 126     // an unresolved string, an unresolved class or a resolved class.
 127     // However, another thread could have resolved the unresolved string
 128     // or class by the time we go there.
 129     assert(tag.is_unresolved_string()|| tag.is_string(), "expected string");
 130 #endif
 131     oop s_oop = pool->string_at(index, CHECK);
 132     thread->set_vm_result(s_oop);
 133   }
 134 IRT_END
 135 
 136 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
 137   assert(bytecode == Bytecodes::_fast_aldc ||
 138          bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
 139   ResourceMark rm(thread);
 140   methodHandle m (thread, method(thread));
 141   Bytecode_loadconstant ldc(m, bci(thread));
 142   oop result = ldc.resolve_constant(CHECK);
 143 #ifdef ASSERT
 144   {
 145     // The bytecode wrappers aren't GC-safe so construct a new one
 146     Bytecode_loadconstant ldc2(m, bci(thread));
 147     ConstantPoolCacheEntry* cpce = m->constants()->cache()->entry_at(ldc2.cache_index());
 148     assert(result == cpce->f1_as_instance(), "expected result for assembly code");
 149   }
 150 #endif
 151 }
 152 IRT_END
 153 
 154 
 155 //------------------------------------------------------------------------------------------------------------------------
 156 // Allocation
 157 
 158 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, constantPoolOopDesc* pool, int index))
 159   klassOop k_oop = pool->klass_at(index, CHECK);
 160   instanceKlassHandle klass (THREAD, k_oop);
 161 
 162   // Make sure we are not instantiating an abstract klass
 163   klass->check_valid_for_instantiation(true, CHECK);
 164 
 165   // Make sure klass is initialized
 166   klass->initialize(CHECK);
 167 
 168   // At this point the class may not be fully initialized
 169   // because of recursive initialization. If it is fully
 170   // initialized & has_finalized is not set, we rewrite
 171   // it into its fast version (Note: no locking is needed
 172   // here since this is an atomic byte write and can be
 173   // done more than once).
 174   //
 175   // Note: In case of classes with has_finalized we don't
 176   //       rewrite since that saves us an extra check in
 177   //       the fast version which then would call the
 178   //       slow version anyway (and do a call back into
 179   //       Java).
 180   //       If we have a breakpoint, then we don't rewrite
 181   //       because the _breakpoint bytecode would be lost.
 182   oop obj = klass->allocate_instance(CHECK);
 183   thread->set_vm_result(obj);
 184 IRT_END
 185 
 186 
 187 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
 188   oop obj = oopFactory::new_typeArray(type, size, CHECK);
 189   thread->set_vm_result(obj);
 190 IRT_END
 191 
 192 
 193 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, constantPoolOopDesc* pool, int index, jint size))
 194   // Note: no oopHandle for pool & klass needed since they are not used
 195   //       anymore after new_objArray() and no GC can happen before.
 196   //       (This may have to change if this code changes!)
 197   klassOop  klass = pool->klass_at(index, CHECK);
 198   objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
 199   thread->set_vm_result(obj);
 200 IRT_END
 201 
 202 
 203 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
 204   // We may want to pass in more arguments - could make this slightly faster
 205   constantPoolOop constants = method(thread)->constants();
 206   int          i = get_index_u2(thread, Bytecodes::_multianewarray);
 207   klassOop klass = constants->klass_at(i, CHECK);
 208   int   nof_dims = number_of_dimensions(thread);
 209   assert(oop(klass)->is_klass(), "not a class");
 210   assert(nof_dims >= 1, "multianewarray rank must be nonzero");
 211 
 212   // We must create an array of jints to pass to multi_allocate.
 213   ResourceMark rm(thread);
 214   const int small_dims = 10;
 215   jint dim_array[small_dims];
 216   jint *dims = &dim_array[0];
 217   if (nof_dims > small_dims) {
 218     dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
 219   }
 220   for (int index = 0; index < nof_dims; index++) {
 221     // offset from first_size_address is addressed as local[index]
 222     int n = Interpreter::local_offset_in_bytes(index)/jintSize;
 223     dims[index] = first_size_address[n];
 224   }
 225   oop obj = arrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
 226   thread->set_vm_result(obj);
 227 IRT_END
 228 
 229 
 230 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
 231   assert(obj->is_oop(), "must be a valid oop");
 232   assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise");
 233   instanceKlass::register_finalizer(instanceOop(obj), CHECK);
 234 IRT_END
 235 
 236 
 237 // Quicken instance-of and check-cast bytecodes
 238 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
 239   // Force resolving; quicken the bytecode
 240   int which = get_index_u2(thread, Bytecodes::_checkcast);
 241   constantPoolOop cpool = method(thread)->constants();
 242   // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
 243   // program we might have seen an unquick'd bytecode in the interpreter but have another
 244   // thread quicken the bytecode before we get here.
 245   // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
 246   klassOop klass = cpool->klass_at(which, CHECK);
 247   thread->set_vm_result(klass);
 248 IRT_END
 249 
 250 
 251 //------------------------------------------------------------------------------------------------------------------------
 252 // Exceptions
 253 
 254 // Assume the compiler is (or will be) interested in this event.
 255 // If necessary, create an MDO to hold the information, and record it.
 256 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
 257   assert(ProfileTraps, "call me only if profiling");
 258   methodHandle trap_method(thread, method(thread));
 259 
 260   if (trap_method.not_null()) {
 261     methodDataHandle trap_mdo(thread, trap_method->method_data());
 262     if (trap_mdo.is_null()) {
 263       methodOopDesc::build_interpreter_method_data(trap_method, THREAD);
 264       if (HAS_PENDING_EXCEPTION) {
 265         assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 266         CLEAR_PENDING_EXCEPTION;
 267       }
 268       trap_mdo = methodDataHandle(thread, trap_method->method_data());
 269       // and fall through...
 270     }
 271     if (trap_mdo.not_null()) {
 272       // Update per-method count of trap events.  The interpreter
 273       // is updating the MDO to simulate the effect of compiler traps.
 274       int trap_bci = trap_method->bci_from(bcp(thread));
 275       Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
 276     }
 277   }
 278 }
 279 
 280 static Handle get_preinitialized_exception(klassOop k, TRAPS) {
 281   // get klass
 282   instanceKlass* klass = instanceKlass::cast(k);
 283   assert(klass->is_initialized(),
 284          "this klass should have been initialized during VM initialization");
 285   // create instance - do not call constructor since we may have no
 286   // (java) stack space left (should assert constructor is empty)
 287   Handle exception;
 288   oop exception_oop = klass->allocate_instance(CHECK_(exception));
 289   exception = Handle(THREAD, exception_oop);
 290   if (StackTraceInThrowable) {
 291     java_lang_Throwable::fill_in_stack_trace(exception);
 292   }
 293   return exception;
 294 }
 295 
 296 // Special handling for stack overflow: since we don't have any (java) stack
 297 // space left we use the pre-allocated & pre-initialized StackOverflowError
 298 // klass to create an stack overflow error instance.  We do not call its
 299 // constructor for the same reason (it is empty, anyway).
 300 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
 301   Handle exception = get_preinitialized_exception(
 302                                  SystemDictionary::StackOverflowError_klass(),
 303                                  CHECK);
 304   THROW_HANDLE(exception);
 305 IRT_END
 306 
 307 
 308 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
 309   // lookup exception klass
 310   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 311   if (ProfileTraps) {
 312     if (s == vmSymbols::java_lang_ArithmeticException()) {
 313       note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
 314     } else if (s == vmSymbols::java_lang_NullPointerException()) {
 315       note_trap(thread, Deoptimization::Reason_null_check, CHECK);
 316     }
 317   }
 318   // create exception
 319   Handle exception = Exceptions::new_exception(thread, s, message);
 320   thread->set_vm_result(exception());
 321 IRT_END
 322 
 323 
 324 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
 325   ResourceMark rm(thread);
 326   const char* klass_name = Klass::cast(obj->klass())->external_name();
 327   // lookup exception klass
 328   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 329   if (ProfileTraps) {
 330     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 331   }
 332   // create exception, with klass name as detail message
 333   Handle exception = Exceptions::new_exception(thread, s, klass_name);
 334   thread->set_vm_result(exception());
 335 IRT_END
 336 
 337 
 338 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
 339   char message[jintAsStringSize];
 340   // lookup exception klass
 341   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
 342   if (ProfileTraps) {
 343     note_trap(thread, Deoptimization::Reason_range_check, CHECK);
 344   }
 345   // create exception
 346   sprintf(message, "%d", index);
 347   THROW_MSG(s, message);
 348 IRT_END
 349 
 350 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
 351   JavaThread* thread, oopDesc* obj))
 352 
 353   ResourceMark rm(thread);
 354   char* message = SharedRuntime::generate_class_cast_message(
 355     thread, Klass::cast(obj->klass())->external_name());
 356 
 357   if (ProfileTraps) {
 358     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 359   }
 360 
 361   // create exception
 362   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
 363 IRT_END
 364 
 365 // exception_handler_for_exception(...) returns the continuation address,
 366 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
 367 // The exception oop is returned to make sure it is preserved over GC (it
 368 // is only on the stack if the exception was thrown explicitly via athrow).
 369 // During this operation, the expression stack contains the values for the
 370 // bci where the exception happened. If the exception was propagated back
 371 // from a call, the expression stack contains the values for the bci at the
 372 // invoke w/o arguments (i.e., as if one were inside the call).
 373 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
 374 
 375   Handle             h_exception(thread, exception);
 376   methodHandle       h_method   (thread, method(thread));
 377   constantPoolHandle h_constants(thread, h_method->constants());
 378   bool               should_repeat;
 379   int                handler_bci;
 380   int                current_bci = bci(thread);
 381 
 382   // Need to do this check first since when _do_not_unlock_if_synchronized
 383   // is set, we don't want to trigger any classloading which may make calls
 384   // into java, or surprisingly find a matching exception handler for bci 0
 385   // since at this moment the method hasn't been "officially" entered yet.
 386   if (thread->do_not_unlock_if_synchronized()) {
 387     ResourceMark rm;
 388     assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");
 389     thread->set_vm_result(exception);
 390 #ifdef CC_INTERP
 391     return (address) -1;
 392 #else
 393     return Interpreter::remove_activation_entry();
 394 #endif
 395   }
 396 
 397   do {
 398     should_repeat = false;
 399 
 400     // assertions
 401 #ifdef ASSERT
 402     assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
 403     assert(h_exception->is_oop(), "just checking");
 404     // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
 405     if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
 406       if (ExitVMOnVerifyError) vm_exit(-1);
 407       ShouldNotReachHere();
 408     }
 409 #endif
 410 
 411     // tracing
 412     if (TraceExceptions) {
 413       ttyLocker ttyl;
 414       ResourceMark rm(thread);
 415       tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());
 416       tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
 417       tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
 418     }
 419 // Don't go paging in something which won't be used.
 420 //     else if (h_extable->length() == 0) {
 421 //       // disabled for now - interpreter is not using shortcut yet
 422 //       // (shortcut is not to call runtime if we have no exception handlers)
 423 //       // warning("performance bug: should not call runtime if method has no exception handlers");
 424 //     }
 425     // for AbortVMOnException flag
 426     NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
 427 
 428     // exception handler lookup
 429     KlassHandle h_klass(THREAD, h_exception->klass());
 430     handler_bci = h_method->fast_exception_handler_bci_for(h_klass, current_bci, THREAD);
 431     if (HAS_PENDING_EXCEPTION) {
 432       // We threw an exception while trying to find the exception handler.
 433       // Transfer the new exception to the exception handle which will
 434       // be set into thread local storage, and do another lookup for an
 435       // exception handler for this exception, this time starting at the
 436       // BCI of the exception handler which caused the exception to be
 437       // thrown (bug 4307310).
 438       h_exception = Handle(THREAD, PENDING_EXCEPTION);
 439       CLEAR_PENDING_EXCEPTION;
 440       if (handler_bci >= 0) {
 441         current_bci = handler_bci;
 442         should_repeat = true;
 443       }
 444     }
 445   } while (should_repeat == true);
 446 
 447   // notify JVMTI of an exception throw; JVMTI will detect if this is a first
 448   // time throw or a stack unwinding throw and accordingly notify the debugger
 449   if (JvmtiExport::can_post_on_exceptions()) {
 450     JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
 451   }
 452 
 453 #ifdef CC_INTERP
 454   address continuation = (address)(intptr_t) handler_bci;
 455 #else
 456   address continuation = NULL;
 457 #endif
 458   address handler_pc = NULL;
 459   if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
 460     // Forward exception to callee (leaving bci/bcp untouched) because (a) no
 461     // handler in this method, or (b) after a stack overflow there is not yet
 462     // enough stack space available to reprotect the stack.
 463 #ifndef CC_INTERP
 464     continuation = Interpreter::remove_activation_entry();
 465 #endif
 466     // Count this for compilation purposes
 467     h_method->interpreter_throwout_increment();
 468   } else {
 469     // handler in this method => change bci/bcp to handler bci/bcp and continue there
 470     handler_pc = h_method->code_base() + handler_bci;
 471 #ifndef CC_INTERP
 472     set_bcp_and_mdp(handler_pc, thread);
 473     continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
 474 #endif
 475   }
 476   // notify debugger of an exception catch
 477   // (this is good for exceptions caught in native methods as well)
 478   if (JvmtiExport::can_post_on_exceptions()) {
 479     JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
 480   }
 481 
 482   thread->set_vm_result(h_exception());
 483   return continuation;
 484 IRT_END
 485 
 486 
 487 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
 488   assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
 489   // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
 490 IRT_END
 491 
 492 
 493 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
 494   THROW(vmSymbols::java_lang_AbstractMethodError());
 495 IRT_END
 496 
 497 
 498 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
 499   THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
 500 IRT_END
 501 
 502 
 503 //------------------------------------------------------------------------------------------------------------------------
 504 // Fields
 505 //
 506 
 507 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
 508   // resolve field
 509   FieldAccessInfo info;
 510   constantPoolHandle pool(thread, method(thread)->constants());
 511   bool is_put    = (bytecode == Bytecodes::_putfield  || bytecode == Bytecodes::_putstatic);
 512   bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
 513 
 514   {
 515     JvmtiHideSingleStepping jhss(thread);
 516     LinkResolver::resolve_field(info, pool, get_index_u2_cpcache(thread, bytecode),
 517                                 bytecode, false, CHECK);
 518   } // end JvmtiHideSingleStepping
 519 
 520   // check if link resolution caused cpCache to be updated
 521   if (already_resolved(thread)) return;
 522 
 523   // compute auxiliary field attributes
 524   TosState state  = as_TosState(info.field_type());
 525 
 526   // We need to delay resolving put instructions on final fields
 527   // until we actually invoke one. This is required so we throw
 528   // exceptions at the correct place. If we do not resolve completely
 529   // in the current pass, leaving the put_code set to zero will
 530   // cause the next put instruction to reresolve.
 531   Bytecodes::Code put_code = (Bytecodes::Code)0;
 532 
 533   // We also need to delay resolving getstatic instructions until the
 534   // class is intitialized.  This is required so that access to the static
 535   // field will call the initialization function every time until the class
 536   // is completely initialized ala. in 2.17.5 in JVM Specification.
 537   instanceKlass *klass = instanceKlass::cast(info.klass()->as_klassOop());
 538   bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
 539                                !klass->is_initialized());
 540   Bytecodes::Code get_code = (Bytecodes::Code)0;
 541 
 542   if (!uninitialized_static) {
 543     get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
 544     if (is_put || !info.access_flags().is_final()) {
 545       put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
 546     }
 547   }
 548 
 549   cache_entry(thread)->set_field(
 550     get_code,
 551     put_code,
 552     info.klass(),
 553     info.field_index(),
 554     info.field_offset(),
 555     state,
 556     info.access_flags().is_final(),
 557     info.access_flags().is_volatile()
 558   );
 559 IRT_END
 560 
 561 
 562 //------------------------------------------------------------------------------------------------------------------------
 563 // Synchronization
 564 //
 565 // The interpreter's synchronization code is factored out so that it can
 566 // be shared by method invocation and synchronized blocks.
 567 //%note synchronization_3
 568 
 569 static void trace_locking(Handle& h_locking_obj, bool is_locking) {
 570   ObjectSynchronizer::trace_locking(h_locking_obj, false, true, is_locking);
 571 }
 572 
 573 
 574 //%note monitor_1
 575 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
 576 #ifdef ASSERT
 577   thread->last_frame().interpreter_frame_verify_monitor(elem);
 578 #endif
 579   if (PrintBiasedLockingStatistics) {
 580     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
 581   }
 582   Handle h_obj(thread, elem->obj());
 583   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 584          "must be NULL or an object");
 585   if (UseBiasedLocking) {
 586     // Retry fast entry if bias is revoked to avoid unnecessary inflation
 587     ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
 588   } else {
 589     ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
 590   }
 591   assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
 592          "must be NULL or an object");
 593 #ifdef ASSERT
 594   thread->last_frame().interpreter_frame_verify_monitor(elem);
 595 #endif
 596 IRT_END
 597 
 598 
 599 //%note monitor_1
 600 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
 601 #ifdef ASSERT
 602   thread->last_frame().interpreter_frame_verify_monitor(elem);
 603 #endif
 604   Handle h_obj(thread, elem->obj());
 605   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 606          "must be NULL or an object");
 607   if (elem == NULL || h_obj()->is_unlocked()) {
 608     THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 609   }
 610   ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
 611   // Free entry. This must be done here, since a pending exception might be installed on
 612   // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
 613   elem->set_obj(NULL);
 614 #ifdef ASSERT
 615   thread->last_frame().interpreter_frame_verify_monitor(elem);
 616 #endif
 617 IRT_END
 618 
 619 
 620 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
 621   THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 622 IRT_END
 623 
 624 
 625 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
 626   // Returns an illegal exception to install into the current thread. The
 627   // pending_exception flag is cleared so normal exception handling does not
 628   // trigger. Any current installed exception will be overwritten. This
 629   // method will be called during an exception unwind.
 630 
 631   assert(!HAS_PENDING_EXCEPTION, "no pending exception");
 632   Handle exception(thread, thread->vm_result());
 633   assert(exception() != NULL, "vm result should be set");
 634   thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
 635   if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
 636     exception = get_preinitialized_exception(
 637                        SystemDictionary::IllegalMonitorStateException_klass(),
 638                        CATCH);
 639   }
 640   thread->set_vm_result(exception());
 641 IRT_END
 642 
 643 
 644 //------------------------------------------------------------------------------------------------------------------------
 645 // Invokes
 646 
 647 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp))
 648   return method->orig_bytecode_at(method->bci_from(bcp));
 649 IRT_END
 650 
 651 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp, Bytecodes::Code new_code))
 652   method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
 653 IRT_END
 654 
 655 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, methodOopDesc* method, address bcp))
 656   JvmtiExport::post_raw_breakpoint(thread, method, bcp);
 657 IRT_END
 658 
 659 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
 660   // extract receiver from the outgoing argument list if necessary
 661   Handle receiver(thread, NULL);
 662   if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
 663     ResourceMark rm(thread);
 664     methodHandle m (thread, method(thread));
 665     Bytecode_invoke call(m, bci(thread));
 666     Symbol* signature = call.signature();
 667     receiver = Handle(thread,
 668                   thread->last_frame().interpreter_callee_receiver(signature));
 669     assert(Universe::heap()->is_in_reserved_or_null(receiver()),
 670            "sanity check");
 671     assert(receiver.is_null() ||
 672            Universe::heap()->is_in_reserved(receiver->klass()),
 673            "sanity check");
 674   }
 675 
 676   // resolve method
 677   CallInfo info;
 678   constantPoolHandle pool(thread, method(thread)->constants());
 679 
 680   {
 681     JvmtiHideSingleStepping jhss(thread);
 682     LinkResolver::resolve_invoke(info, receiver, pool,
 683                                  get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 684     if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
 685       int retry_count = 0;
 686       while (info.resolved_method()->is_old()) {
 687         // It is very unlikely that method is redefined more than 100 times
 688         // in the middle of resolve. If it is looping here more than 100 times
 689         // means then there could be a bug here.
 690         guarantee((retry_count++ < 100),
 691                   "Could not resolve to latest version of redefined method");
 692         // method is redefined in the middle of resolve so re-try.
 693         LinkResolver::resolve_invoke(info, receiver, pool,
 694                                      get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 695       }
 696     }
 697   } // end JvmtiHideSingleStepping
 698 
 699   // check if link resolution caused cpCache to be updated
 700   if (already_resolved(thread)) return;
 701 
 702   if (bytecode == Bytecodes::_invokeinterface) {
 703 
 704     if (TraceItables && Verbose) {
 705       ResourceMark rm(thread);
 706       tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
 707     }
 708     if (info.resolved_method()->method_holder() ==
 709                                             SystemDictionary::Object_klass()) {
 710       // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
 711       // (see also cpCacheOop.cpp for details)
 712       methodHandle rm = info.resolved_method();
 713       assert(rm->is_final() || info.has_vtable_index(),
 714              "should have been set already");
 715       cache_entry(thread)->set_method(bytecode, rm, info.vtable_index());
 716     } else {
 717       // Setup itable entry
 718       int index = klassItable::compute_itable_index(info.resolved_method()());
 719       cache_entry(thread)->set_interface_call(info.resolved_method(), index);
 720     }
 721   } else {
 722     cache_entry(thread)->set_method(
 723       bytecode,
 724       info.resolved_method(),
 725       info.vtable_index());
 726   }
 727 }
 728 IRT_END
 729 
 730 
 731 // First time execution:  Resolve symbols, create a permanent MethodType object.
 732 IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) {
 733   assert(EnableInvokeDynamic, "");
 734   const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
 735 
 736   // resolve method
 737   CallInfo info;
 738   constantPoolHandle pool(thread, method(thread)->constants());
 739 
 740   {
 741     JvmtiHideSingleStepping jhss(thread);
 742     LinkResolver::resolve_invoke(info, Handle(), pool,
 743                                  get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
 744   } // end JvmtiHideSingleStepping
 745 
 746   cache_entry(thread)->set_method_handle(
 747       pool,
 748       info.resolved_method(),
 749       info.resolved_appendix(),
 750       info.resolved_method_type());
 751 }
 752 IRT_END
 753 
 754 
 755 // First time execution:  Resolve symbols, create a permanent CallSite object.
 756 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
 757   assert(EnableInvokeDynamic, "");
 758   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
 759 
 760   //TO DO: consider passing BCI to Java.
 761   //  int caller_bci = method(thread)->bci_from(bcp(thread));
 762 
 763   // resolve method
 764   CallInfo info;
 765   constantPoolHandle pool(thread, method(thread)->constants());
 766   int index = get_index_u4(thread, bytecode);
 767 
 768   {
 769     JvmtiHideSingleStepping jhss(thread);
 770     LinkResolver::resolve_invoke(info, Handle(), pool,
 771                                  index, bytecode, CHECK);
 772   } // end JvmtiHideSingleStepping
 773 
 774   pool->cache()->secondary_entry_at(index)->set_dynamic_call(
 775       pool,
 776       info.resolved_method(),
 777       info.resolved_appendix(),
 778       info.resolved_method_type());
 779 }
 780 IRT_END
 781 
 782 
 783 //------------------------------------------------------------------------------------------------------------------------
 784 // Miscellaneous
 785 
 786 
 787 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
 788   nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
 789   assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
 790   if (branch_bcp != NULL && nm != NULL) {
 791     // This was a successful request for an OSR nmethod.  Because
 792     // frequency_counter_overflow_inner ends with a safepoint check,
 793     // nm could have been unloaded so look it up again.  It's unsafe
 794     // to examine nm directly since it might have been freed and used
 795     // for something else.
 796     frame fr = thread->last_frame();
 797     methodOop method =  fr.interpreter_frame_method();
 798     int bci = method->bci_from(fr.interpreter_frame_bcp());
 799     nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
 800   }
 801 #ifndef PRODUCT
 802   if (TraceOnStackReplacement) {
 803     if (nm != NULL) {
 804       tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry());
 805       nm->print();
 806     }
 807   }
 808 #endif
 809   return nm;
 810 }
 811 
 812 IRT_ENTRY(nmethod*,
 813           InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
 814   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 815   // flag, in case this method triggers classloading which will call into Java.
 816   UnlockFlagSaver fs(thread);
 817 
 818   frame fr = thread->last_frame();
 819   assert(fr.is_interpreted_frame(), "must come from interpreter");
 820   methodHandle method(thread, fr.interpreter_frame_method());
 821   const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
 822   const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
 823 
 824   assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
 825   nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
 826   assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
 827 
 828   if (osr_nm != NULL) {
 829     // We may need to do on-stack replacement which requires that no
 830     // monitors in the activation are biased because their
 831     // BasicObjectLocks will need to migrate during OSR. Force
 832     // unbiasing of all monitors in the activation now (even though
 833     // the OSR nmethod might be invalidated) because we don't have a
 834     // safepoint opportunity later once the migration begins.
 835     if (UseBiasedLocking) {
 836       ResourceMark rm;
 837       GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
 838       for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
 839            kptr < fr.interpreter_frame_monitor_begin();
 840            kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
 841         if( kptr->obj() != NULL ) {
 842           objects_to_revoke->append(Handle(THREAD, kptr->obj()));
 843         }
 844       }
 845       BiasedLocking::revoke(objects_to_revoke);
 846     }
 847   }
 848   return osr_nm;
 849 IRT_END
 850 
 851 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(methodOopDesc* method, address cur_bcp))
 852   assert(ProfileInterpreter, "must be profiling interpreter");
 853   int bci = method->bci_from(cur_bcp);
 854   methodDataOop mdo = method->method_data();
 855   if (mdo == NULL)  return 0;
 856   return mdo->bci_to_di(bci);
 857 IRT_END
 858 
 859 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
 860   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 861   // flag, in case this method triggers classloading which will call into Java.
 862   UnlockFlagSaver fs(thread);
 863 
 864   assert(ProfileInterpreter, "must be profiling interpreter");
 865   frame fr = thread->last_frame();
 866   assert(fr.is_interpreted_frame(), "must come from interpreter");
 867   methodHandle method(thread, fr.interpreter_frame_method());
 868   methodOopDesc::build_interpreter_method_data(method, THREAD);
 869   if (HAS_PENDING_EXCEPTION) {
 870     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 871     CLEAR_PENDING_EXCEPTION;
 872     // and fall through...
 873   }
 874 IRT_END
 875 
 876 
 877 #ifdef ASSERT
 878 IRT_LEAF(void, InterpreterRuntime::verify_mdp(methodOopDesc* method, address bcp, address mdp))
 879   assert(ProfileInterpreter, "must be profiling interpreter");
 880 
 881   methodDataOop mdo = method->method_data();
 882   assert(mdo != NULL, "must not be null");
 883 
 884   int bci = method->bci_from(bcp);
 885 
 886   address mdp2 = mdo->bci_to_dp(bci);
 887   if (mdp != mdp2) {
 888     ResourceMark rm;
 889     ResetNoHandleMark rnm; // In a LEAF entry.
 890     HandleMark hm;
 891     tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);
 892     int current_di = mdo->dp_to_di(mdp);
 893     int expected_di  = mdo->dp_to_di(mdp2);
 894     tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);
 895     int expected_approx_bci = mdo->data_at(expected_di)->bci();
 896     int approx_bci = -1;
 897     if (current_di >= 0) {
 898       approx_bci = mdo->data_at(current_di)->bci();
 899     }
 900     tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);
 901     mdo->print_on(tty);
 902     method->print_codes();
 903   }
 904   assert(mdp == mdp2, "wrong mdp");
 905 IRT_END
 906 #endif // ASSERT
 907 
 908 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
 909   assert(ProfileInterpreter, "must be profiling interpreter");
 910   ResourceMark rm(thread);
 911   HandleMark hm(thread);
 912   frame fr = thread->last_frame();
 913   assert(fr.is_interpreted_frame(), "must come from interpreter");
 914   methodDataHandle h_mdo(thread, fr.interpreter_frame_method()->method_data());
 915 
 916   // Grab a lock to ensure atomic access to setting the return bci and
 917   // the displacement.  This can block and GC, invalidating all naked oops.
 918   MutexLocker ml(RetData_lock);
 919 
 920   // ProfileData is essentially a wrapper around a derived oop, so we
 921   // need to take the lock before making any ProfileData structures.
 922   ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
 923   RetData* rdata = data->as_RetData();
 924   address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
 925   fr.interpreter_frame_set_mdp(new_mdp);
 926 IRT_END
 927 
 928 
 929 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
 930   // We used to need an explict preserve_arguments here for invoke bytecodes. However,
 931   // stack traversal automatically takes care of preserving arguments for invoke, so
 932   // this is no longer needed.
 933 
 934   // IRT_END does an implicit safepoint check, hence we are guaranteed to block
 935   // if this is called during a safepoint
 936 
 937   if (JvmtiExport::should_post_single_step()) {
 938     // We are called during regular safepoints and when the VM is
 939     // single stepping. If any thread is marked for single stepping,
 940     // then we may have JVMTI work to do.
 941     JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
 942   }
 943 IRT_END
 944 
 945 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
 946 ConstantPoolCacheEntry *cp_entry))
 947 
 948   // check the access_flags for the field in the klass
 949 
 950   instanceKlass* ik = instanceKlass::cast(java_lang_Class::as_klassOop(cp_entry->f1_as_klass_mirror()));
 951   int index = cp_entry->field_index();
 952   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
 953 
 954   switch(cp_entry->flag_state()) {
 955     case btos:    // fall through
 956     case ctos:    // fall through
 957     case stos:    // fall through
 958     case itos:    // fall through
 959     case ftos:    // fall through
 960     case ltos:    // fall through
 961     case dtos:    // fall through
 962     case atos: break;
 963     default: ShouldNotReachHere(); return;
 964   }
 965   bool is_static = (obj == NULL);
 966   HandleMark hm(thread);
 967 
 968   Handle h_obj;
 969   if (!is_static) {
 970     // non-static field accessors have an object, but we need a handle
 971     h_obj = Handle(thread, obj);
 972   }
 973   instanceKlassHandle h_cp_entry_f1(thread, java_lang_Class::as_klassOop(cp_entry->f1_as_klass_mirror()));
 974   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2_as_index(), is_static);
 975   JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
 976 IRT_END
 977 
 978 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
 979   oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
 980 
 981   klassOop k = java_lang_Class::as_klassOop(cp_entry->f1_as_klass_mirror());
 982 
 983   // check the access_flags for the field in the klass
 984   instanceKlass* ik = instanceKlass::cast(k);
 985   int index = cp_entry->field_index();
 986   // bail out if field modifications are not watched
 987   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
 988 
 989   char sig_type = '\0';
 990 
 991   switch(cp_entry->flag_state()) {
 992     case btos: sig_type = 'Z'; break;
 993     case ctos: sig_type = 'C'; break;
 994     case stos: sig_type = 'S'; break;
 995     case itos: sig_type = 'I'; break;
 996     case ftos: sig_type = 'F'; break;
 997     case atos: sig_type = 'L'; break;
 998     case ltos: sig_type = 'J'; break;
 999     case dtos: sig_type = 'D'; break;
1000     default:  ShouldNotReachHere(); return;
1001   }
1002   bool is_static = (obj == NULL);
1003 
1004   HandleMark hm(thread);
1005   instanceKlassHandle h_klass(thread, k);
1006   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2_as_index(), is_static);
1007   jvalue fvalue;
1008 #ifdef _LP64
1009   fvalue = *value;
1010 #else
1011   // Long/double values are stored unaligned and also noncontiguously with
1012   // tagged stacks.  We can't just do a simple assignment even in the non-
1013   // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1014   // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1015   // We assume that the two halves of longs/doubles are stored in interpreter
1016   // stack slots in platform-endian order.
1017   jlong_accessor u;
1018   jint* newval = (jint*)value;
1019   u.words[0] = newval[0];
1020   u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1021   fvalue.j = u.long_value;
1022 #endif // _LP64
1023 
1024   Handle h_obj;
1025   if (!is_static) {
1026     // non-static field accessors have an object, but we need a handle
1027     h_obj = Handle(thread, obj);
1028   }
1029 
1030   JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1031                                            fid, sig_type, &fvalue);
1032 IRT_END
1033 
1034 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1035   JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1036 IRT_END
1037 
1038 
1039 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1040   JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1041 IRT_END
1042 
1043 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1044 {
1045   return (Interpreter::contains(pc) ? 1 : 0);
1046 }
1047 IRT_END
1048 
1049 
1050 // Implementation of SignatureHandlerLibrary
1051 
1052 address SignatureHandlerLibrary::set_handler_blob() {
1053   BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1054   if (handler_blob == NULL) {
1055     return NULL;
1056   }
1057   address handler = handler_blob->code_begin();
1058   _handler_blob = handler_blob;
1059   _handler = handler;
1060   return handler;
1061 }
1062 
1063 void SignatureHandlerLibrary::initialize() {
1064   if (_fingerprints != NULL) {
1065     return;
1066   }
1067   if (set_handler_blob() == NULL) {
1068     vm_exit_out_of_memory(blob_size, "native signature handlers");
1069   }
1070 
1071   BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1072                                       SignatureHandlerLibrary::buffer_size);
1073   _buffer = bb->code_begin();
1074 
1075   _fingerprints = new(ResourceObj::C_HEAP, mtCode)GrowableArray<uint64_t>(32, true);
1076   _handlers     = new(ResourceObj::C_HEAP, mtCode)GrowableArray<address>(32, true);
1077 }
1078 
1079 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1080   address handler   = _handler;
1081   int     insts_size = buffer->pure_insts_size();
1082   if (handler + insts_size > _handler_blob->code_end()) {
1083     // get a new handler blob
1084     handler = set_handler_blob();
1085   }
1086   if (handler != NULL) {
1087     memcpy(handler, buffer->insts_begin(), insts_size);
1088     pd_set_handler(handler);
1089     ICache::invalidate_range(handler, insts_size);
1090     _handler = handler + insts_size;
1091   }
1092   return handler;
1093 }
1094 
1095 void SignatureHandlerLibrary::add(methodHandle method) {
1096   if (method->signature_handler() == NULL) {
1097     // use slow signature handler if we can't do better
1098     int handler_index = -1;
1099     // check if we can use customized (fast) signature handler
1100     if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1101       // use customized signature handler
1102       MutexLocker mu(SignatureHandlerLibrary_lock);
1103       // make sure data structure is initialized
1104       initialize();
1105       // lookup method signature's fingerprint
1106       uint64_t fingerprint = Fingerprinter(method).fingerprint();
1107       handler_index = _fingerprints->find(fingerprint);
1108       // create handler if necessary
1109       if (handler_index < 0) {
1110         ResourceMark rm;
1111         ptrdiff_t align_offset = (address)
1112           round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1113         CodeBuffer buffer((address)(_buffer + align_offset),
1114                           SignatureHandlerLibrary::buffer_size - align_offset);
1115         InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1116         // copy into code heap
1117         address handler = set_handler(&buffer);
1118         if (handler == NULL) {
1119           // use slow signature handler
1120         } else {
1121           // debugging suppport
1122           if (PrintSignatureHandlers) {
1123             tty->cr();
1124             tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1125                           _handlers->length(),
1126                           (method->is_static() ? "static" : "receiver"),
1127                           method->name_and_sig_as_C_string(),
1128                           fingerprint,
1129                           buffer.insts_size());
1130             Disassembler::decode(handler, handler + buffer.insts_size());
1131 #ifndef PRODUCT
1132             tty->print_cr(" --- associated result handler ---");
1133             address rh_begin = Interpreter::result_handler(method()->result_type());
1134             address rh_end = rh_begin;
1135             while (*(int*)rh_end != 0) {
1136               rh_end += sizeof(int);
1137             }
1138             Disassembler::decode(rh_begin, rh_end);
1139 #endif
1140           }
1141           // add handler to library
1142           _fingerprints->append(fingerprint);
1143           _handlers->append(handler);
1144           // set handler index
1145           assert(_fingerprints->length() == _handlers->length(), "sanity check");
1146           handler_index = _fingerprints->length() - 1;
1147         }
1148       }
1149       // Set handler under SignatureHandlerLibrary_lock
1150     if (handler_index < 0) {
1151       // use generic signature handler
1152       method->set_signature_handler(Interpreter::slow_signature_handler());
1153     } else {
1154       // set handler
1155       method->set_signature_handler(_handlers->at(handler_index));
1156     }
1157     } else {
1158       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1159       // use generic signature handler
1160       method->set_signature_handler(Interpreter::slow_signature_handler());
1161     }
1162   }
1163 #ifdef ASSERT
1164   int handler_index = -1;
1165   int fingerprint_index = -2;
1166   {
1167     // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1168     // in any way if accessed from multiple threads. To avoid races with another
1169     // thread which may change the arrays in the above, mutex protected block, we
1170     // have to protect this read access here with the same mutex as well!
1171     MutexLocker mu(SignatureHandlerLibrary_lock);
1172     if (_handlers != NULL) {
1173     handler_index = _handlers->find(method->signature_handler());
1174     fingerprint_index = _fingerprints->find(Fingerprinter(method).fingerprint());
1175   }
1176   }
1177   assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1178          handler_index == fingerprint_index, "sanity check");
1179 #endif // ASSERT
1180 }
1181 
1182 
1183 BufferBlob*              SignatureHandlerLibrary::_handler_blob = NULL;
1184 address                  SignatureHandlerLibrary::_handler      = NULL;
1185 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1186 GrowableArray<address>*  SignatureHandlerLibrary::_handlers     = NULL;
1187 address                  SignatureHandlerLibrary::_buffer       = NULL;
1188 
1189 
1190 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, methodOopDesc* method))
1191   methodHandle m(thread, method);
1192   assert(m->is_native(), "sanity check");
1193   // lookup native function entry point if it doesn't exist
1194   bool in_base_library;
1195   if (!m->has_native_function()) {
1196     NativeLookup::lookup(m, in_base_library, CHECK);
1197   }
1198   // make sure signature handler is installed
1199   SignatureHandlerLibrary::add(m);
1200   // The interpreter entry point checks the signature handler first,
1201   // before trying to fetch the native entry point and klass mirror.
1202   // We must set the signature handler last, so that multiple processors
1203   // preparing the same method will be sure to see non-null entry & mirror.
1204 IRT_END
1205 
1206 #if defined(IA32) || defined(AMD64) || defined(ARM)
1207 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1208   if (src_address == dest_address) {
1209     return;
1210   }
1211   ResetNoHandleMark rnm; // In a LEAF entry.
1212   HandleMark hm;
1213   ResourceMark rm;
1214   frame fr = thread->last_frame();
1215   assert(fr.is_interpreted_frame(), "");
1216   jint bci = fr.interpreter_frame_bci();
1217   methodHandle mh(thread, fr.interpreter_frame_method());
1218   Bytecode_invoke invoke(mh, bci);
1219   ArgumentSizeComputer asc(invoke.signature());
1220   int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1221   Copy::conjoint_jbytes(src_address, dest_address,
1222                        size_of_arguments * Interpreter::stackElementSize);
1223 IRT_END
1224 #endif