1 /*
   2  * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "code/codeCache.hpp"
  28 #include "code/compiledIC.hpp"
  29 #include "code/icBuffer.hpp"
  30 #include "code/nmethod.hpp"
  31 #include "code/vtableStubs.hpp"
  32 #include "interpreter/interpreter.hpp"
  33 #include "interpreter/linkResolver.hpp"
  34 #include "memory/metadataFactory.hpp"
  35 #include "memory/oopFactory.hpp"
  36 #include "memory/resourceArea.hpp"
  37 #include "oops/method.hpp"
  38 #include "oops/oop.inline.hpp"
  39 #include "oops/symbol.hpp"
  40 #include "runtime/icache.hpp"
  41 #include "runtime/sharedRuntime.hpp"
  42 #include "runtime/stubRoutines.hpp"
  43 #include "utilities/events.hpp"
  44 
  45 
  46 // Every time a compiled IC is changed or its type is being accessed,
  47 // either the CompiledIC_lock must be set or we must be at a safe point.
  48 
  49 //-----------------------------------------------------------------------------
  50 // Low-level access to an inline cache. Private, since they might not be
  51 // MT-safe to use.
  52 
  53 void* CompiledIC::cached_value() const {
  54   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
  55   assert (!is_optimized(), "an optimized virtual call does not have a cached metadata");
  56 
  57   if (!is_in_transition_state()) {
  58     void* data = get_data();
  59     // If we let the metadata value here be initialized to zero...
  60     assert(data != NULL || Universe::non_oop_word() == NULL,
  61            "no raw nulls in CompiledIC metadatas, because of patching races");
  62     return (data == (void*)Universe::non_oop_word()) ? NULL : data;
  63   } else {
  64     return InlineCacheBuffer::cached_value_for((CompiledIC *)this);
  65   }
  66 }
  67 
  68 
  69 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) {
  70   assert(entry_point != NULL, "must set legal entry point");
  71   assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
  72   assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata");
  73   assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata");
  74 
  75   assert(!is_icholder || is_icholder_entry(entry_point), "must be");
  76 
  77   // Don't use ic_destination for this test since that forwards
  78   // through ICBuffer instead of returning the actual current state of
  79   // the CompiledIC.
  80   if (is_icholder_entry(_call->destination())) {
  81     // When patching for the ICStub case the cached value isn't
  82     // overwritten until the ICStub copied into the CompiledIC during
  83     // the next safepoint.  Make sure that the CompiledICHolder* is
  84     // marked for release at this point since it won't be identifiable
  85     // once the entry point is overwritten.
  86     InlineCacheBuffer::queue_for_release((CompiledICHolder*)get_data());
  87   }
  88 
  89   if (TraceCompiledIC) {
  90     tty->print("  ");
  91     print_compiled_ic();
  92     tty->print(" changing destination to " INTPTR_FORMAT, p2i(entry_point));
  93     if (!is_optimized()) {
  94       tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", p2i((address)cache));
  95     }
  96     if (is_icstub) {
  97       tty->print(" (icstub)");
  98     }
  99     tty->cr();
 100   }
 101 
 102   {
 103     MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
 104 #ifdef ASSERT
 105     CodeBlob* cb = CodeCache::find_blob_unsafe(_call->instruction_address());
 106     assert(cb != NULL && cb->is_compiled(), "must be compiled");
 107 #endif
 108     _call->set_destination_mt_safe(entry_point);
 109   }
 110 
 111   if (is_optimized() || is_icstub) {
 112     // Optimized call sites don't have a cache value and ICStub call
 113     // sites only change the entry point.  Changing the value in that
 114     // case could lead to MT safety issues.
 115     assert(cache == NULL, "must be null");
 116     return;
 117   }
 118 
 119   if (cache == NULL)  cache = (void*)Universe::non_oop_word();
 120 
 121   set_data((intptr_t)cache);
 122 }
 123 
 124 
 125 void CompiledIC::set_ic_destination(ICStub* stub) {
 126   internal_set_ic_destination(stub->code_begin(), true, NULL, false);
 127 }
 128 
 129 
 130 
 131 address CompiledIC::ic_destination() const {
 132  assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 133  if (!is_in_transition_state()) {
 134    return _call->destination();
 135  } else {
 136    return InlineCacheBuffer::ic_destination_for((CompiledIC *)this);
 137  }
 138 }
 139 
 140 
 141 bool CompiledIC::is_in_transition_state() const {
 142   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 143   return InlineCacheBuffer::contains(_call->destination());;
 144 }
 145 
 146 
 147 bool CompiledIC::is_icholder_call() const {
 148   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 149   return !_is_optimized && is_icholder_entry(ic_destination());
 150 }
 151 
 152 // Returns native address of 'call' instruction in inline-cache. Used by
 153 // the InlineCacheBuffer when it needs to find the stub.
 154 address CompiledIC::stub_address() const {
 155   assert(is_in_transition_state(), "should only be called when we are in a transition state");
 156   return _call->destination();
 157 }
 158 
 159 // Clears the IC stub if the compiled IC is in transition state
 160 void CompiledIC::clear_ic_stub() {
 161   if (is_in_transition_state()) {
 162     ICStub* stub = ICStub_from_destination_address(stub_address());
 163     stub->clear();
 164   }
 165 }
 166 
 167 //-----------------------------------------------------------------------------
 168 // High-level access to an inline cache. Guaranteed to be MT-safe.
 169 
 170 void CompiledIC::initialize_from_iter(RelocIterator* iter) {
 171   assert(iter->addr() == _call->instruction_address(), "must find ic_call");
 172 
 173   if (iter->type() == relocInfo::virtual_call_type) {
 174     virtual_call_Relocation* r = iter->virtual_call_reloc();
 175     _is_optimized = false;
 176     _value = _call->get_load_instruction(r);
 177   } else {
 178     assert(iter->type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
 179     _is_optimized = true;
 180     _value = NULL;
 181   }
 182 }
 183 
 184 CompiledIC::CompiledIC(CompiledMethod* cm, NativeCall* call)
 185   : _method(cm)
 186 {
 187   _call = _method->call_wrapper_at((address) call);
 188   address ic_call = _call->instruction_address();
 189 
 190   assert(ic_call != NULL, "ic_call address must be set");
 191   assert(cm != NULL, "must pass compiled method");
 192   assert(cm->contains(ic_call), "must be in compiled method");
 193 
 194   // Search for the ic_call at the given address.
 195   RelocIterator iter(cm, ic_call, ic_call+1);
 196   bool ret = iter.next();
 197   assert(ret == true, "relocInfo must exist at this address");
 198   assert(iter.addr() == ic_call, "must find ic_call");
 199 
 200   initialize_from_iter(&iter);
 201 }
 202 
 203 CompiledIC::CompiledIC(RelocIterator* iter)
 204   : _method(iter->code())
 205 {
 206   _call = _method->call_wrapper_at(iter->addr());
 207   address ic_call = _call->instruction_address();
 208 
 209   CompiledMethod* nm = iter->code();
 210   assert(ic_call != NULL, "ic_call address must be set");
 211   assert(nm != NULL, "must pass compiled method");
 212   assert(nm->contains(ic_call), "must be in compiled method");
 213 
 214   initialize_from_iter(iter);
 215 }
 216 
 217 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
 218   assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 219   assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
 220   assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
 221 
 222   address entry;
 223   if (call_info->call_kind() == CallInfo::itable_call) {
 224     assert(bytecode == Bytecodes::_invokeinterface, "");
 225     int itable_index = call_info->itable_index();
 226     entry = VtableStubs::find_itable_stub(itable_index);
 227     if (entry == false) {
 228       return false;
 229     }
 230 #ifdef ASSERT
 231     int index = call_info->resolved_method()->itable_index();
 232     assert(index == itable_index, "CallInfo pre-computes this");
 233 #endif //ASSERT
 234     InstanceKlass* k = call_info->resolved_method()->method_holder();
 235     assert(k->verify_itable_index(itable_index), "sanity check");
 236     InlineCacheBuffer::create_transition_stub(this, k, entry);
 237   } else {
 238     assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable");
 239     // Can be different than selected_method->vtable_index(), due to package-private etc.
 240     int vtable_index = call_info->vtable_index();
 241     assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check");
 242     entry = VtableStubs::find_vtable_stub(vtable_index);
 243     if (entry == NULL) {
 244       return false;
 245     }
 246     InlineCacheBuffer::create_transition_stub(this, NULL, entry);
 247   }
 248 
 249   if (TraceICs) {
 250     ResourceMark rm;
 251     tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
 252                    p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry));
 253   }
 254 
 255   // We can't check this anymore. With lazy deopt we could have already
 256   // cleaned this IC entry before we even return. This is possible if
 257   // we ran out of space in the inline cache buffer trying to do the
 258   // set_next and we safepointed to free up space. This is a benign
 259   // race because the IC entry was complete when we safepointed so
 260   // cleaning it immediately is harmless.
 261   // assert(is_megamorphic(), "sanity check");
 262   return true;
 263 }
 264 
 265 
 266 // true if destination is megamorphic stub
 267 bool CompiledIC::is_megamorphic() const {
 268   assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 269   assert(!is_optimized(), "an optimized call cannot be megamorphic");
 270 
 271   // Cannot rely on cached_value. It is either an interface or a method.
 272   return VtableStubs::is_entry_point(ic_destination());
 273 }
 274 
 275 bool CompiledIC::is_call_to_compiled() const {
 276   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 277 
 278   // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
 279   // method is guaranteed to still exist, since we only remove methods after all inline caches
 280   // has been cleaned up
 281   CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
 282   bool is_monomorphic = (cb != NULL && cb->is_compiled());
 283   // Check that the cached_value is a klass for non-optimized monomorphic calls
 284   // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
 285   // for calling directly to vep without using the inline cache (i.e., cached_value == NULL).
 286   // For JVMCI this occurs because CHA is only used to improve inlining so call sites which could be optimized
 287   // virtuals because there are no currently loaded subclasses of a type are left as virtual call sites.
 288 #ifdef ASSERT
 289   CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
 290   bool is_c1_or_jvmci_method = caller->is_compiled_by_c1() || caller->is_compiled_by_jvmci();
 291   assert( is_c1_or_jvmci_method ||
 292          !is_monomorphic ||
 293          is_optimized() ||
 294          !caller->is_alive() ||
 295          (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
 296 #endif // ASSERT
 297   return is_monomorphic;
 298 }
 299 
 300 
 301 bool CompiledIC::is_call_to_interpreted() const {
 302   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 303   // Call to interpreter if destination is either calling to a stub (if it
 304   // is optimized), or calling to an I2C blob
 305   bool is_call_to_interpreted = false;
 306   if (!is_optimized()) {
 307     // must use unsafe because the destination can be a zombie (and we're cleaning)
 308     // and the print_compiled_ic code wants to know if site (in the non-zombie)
 309     // is to the interpreter.
 310     CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
 311     is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
 312     assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
 313   } else {
 314     // Check if we are calling into our own codeblob (i.e., to a stub)
 315     address dest = ic_destination();
 316 #ifdef ASSERT
 317     {
 318       _call->verify_resolve_call(dest);
 319     }
 320 #endif /* ASSERT */
 321     is_call_to_interpreted = _call->is_call_to_interpreted(dest);
 322   }
 323   return is_call_to_interpreted;
 324 }
 325 
 326 void CompiledIC::set_to_clean(bool in_use) {
 327   assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
 328   if (TraceInlineCacheClearing || TraceICs) {
 329     tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address()));
 330     print();
 331   }
 332 
 333   address entry = _call->get_resolve_call_stub(is_optimized());
 334 
 335   // A zombie transition will always be safe, since the metadata has already been set to NULL, so
 336   // we only need to patch the destination
 337   bool safe_transition = _call->is_safe_for_patching() || !in_use || is_optimized() || SafepointSynchronize::is_at_safepoint();
 338 
 339   if (safe_transition) {
 340     // Kill any leftover stub we might have too
 341     clear_ic_stub();
 342     if (is_optimized()) {
 343       set_ic_destination(entry);
 344     } else {
 345       set_ic_destination_and_value(entry, (void*)NULL);
 346     }
 347   } else {
 348     // Unsafe transition - create stub.
 349     InlineCacheBuffer::create_transition_stub(this, NULL, entry);
 350   }
 351   // We can't check this anymore. With lazy deopt we could have already
 352   // cleaned this IC entry before we even return. This is possible if
 353   // we ran out of space in the inline cache buffer trying to do the
 354   // set_next and we safepointed to free up space. This is a benign
 355   // race because the IC entry was complete when we safepointed so
 356   // cleaning it immediately is harmless.
 357   // assert(is_clean(), "sanity check");
 358 }
 359 
 360 bool CompiledIC::is_clean() const {
 361   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 362   bool is_clean = false;
 363   address dest = ic_destination();
 364   is_clean = dest == _call->get_resolve_call_stub(is_optimized());
 365   assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
 366   return is_clean;
 367 }
 368 
 369 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
 370   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 371   // Updating a cache to the wrong entry can cause bugs that are very hard
 372   // to track down - if cache entry gets invalid - we just clean it. In
 373   // this way it is always the same code path that is responsible for
 374   // updating and resolving an inline cache
 375   //
 376   // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
 377   // callsites. In addition ic_miss code will update a site to monomorphic if it determines
 378   // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
 379   //
 380   // In both of these cases the only thing being modifed is the jump/call target and these
 381   // transitions are mt_safe
 382 
 383   Thread *thread = Thread::current();
 384   if (info.to_interpreter() || info.to_aot()) {
 385     // Call to interpreter
 386     if (info.is_optimized() && is_optimized()) {
 387        assert(is_clean(), "unsafe IC path");
 388        MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
 389       // the call analysis (callee structure) specifies that the call is optimized
 390       // (either because of CHA or the static target is final)
 391       // At code generation time, this call has been emitted as static call
 392       // Call via stub
 393       assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
 394       methodHandle method (thread, (Method*)info.cached_metadata());
 395       _call->set_to_interpreted(method, info);
 396 
 397       if (TraceICs) {
 398          ResourceMark rm(thread);
 399          tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to %s: %s",
 400            p2i(instruction_address()),
 401            (info.to_aot() ? "aot" : "interpreter"),
 402            method->print_value_string());
 403       }
 404     } else {
 405       // Call via method-klass-holder
 406       InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry());
 407       if (TraceICs) {
 408          ResourceMark rm(thread);
 409          tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address()));
 410       }
 411     }
 412   } else {
 413     // Call to compiled code
 414     bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
 415 #ifdef ASSERT
 416     CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
 417     assert (cb != NULL && cb->is_compiled(), "must be compiled!");
 418 #endif /* ASSERT */
 419 
 420     // This is MT safe if we come from a clean-cache and go through a
 421     // non-verified entry point
 422     bool safe = SafepointSynchronize::is_at_safepoint() ||
 423                 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
 424 
 425     if (!safe) {
 426       InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry());
 427     } else {
 428       if (is_optimized()) {
 429         set_ic_destination(info.entry());
 430       } else {
 431         set_ic_destination_and_value(info.entry(), info.cached_metadata());
 432       }
 433     }
 434 
 435     if (TraceICs) {
 436       ResourceMark rm(thread);
 437       assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
 438       tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
 439         p2i(instruction_address()),
 440         ((Klass*)info.cached_metadata())->print_value_string(),
 441         (safe) ? "" : "via stub");
 442     }
 443   }
 444   // We can't check this anymore. With lazy deopt we could have already
 445   // cleaned this IC entry before we even return. This is possible if
 446   // we ran out of space in the inline cache buffer trying to do the
 447   // set_next and we safepointed to free up space. This is a benign
 448   // race because the IC entry was complete when we safepointed so
 449   // cleaning it immediately is harmless.
 450   // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
 451 }
 452 
 453 
 454 // is_optimized: Compiler has generated an optimized call (i.e. fixed, no inline cache)
 455 // static_bound: The call can be static bound. If it isn't also optimized, the property
 456 // wasn't provable at time of compilation. An optimized call will have any necessary
 457 // null check, while a static_bound won't. A static_bound (but not optimized) must
 458 // therefore use the unverified entry point.
 459 void CompiledIC::compute_monomorphic_entry(const methodHandle& method,
 460                                            Klass* receiver_klass,
 461                                            bool is_optimized,
 462                                            bool static_bound,
 463                                            bool caller_is_nmethod,
 464                                            CompiledICInfo& info,
 465                                            TRAPS) {
 466   CompiledMethod* method_code = method->code();
 467 
 468   address entry = NULL;
 469   if (method_code != NULL && method_code->is_in_use()) {
 470     assert(method_code->is_compiled(), "must be compiled");
 471     // Call to compiled code
 472     //
 473     // Note: the following problem exists with Compiler1:
 474     //   - at compile time we may or may not know if the destination is final
 475     //   - if we know that the destination is final (is_optimized), we will emit
 476     //     an optimized virtual call (no inline cache), and need a Method* to make
 477     //     a call to the interpreter
 478     //   - if we don't know if the destination is final, we emit a standard
 479     //     virtual call, and use CompiledICHolder to call interpreted code
 480     //     (no static call stub has been generated)
 481     //   - In the case that we here notice the call is static bound we
 482     //     convert the call into what looks to be an optimized virtual call,
 483     //     but we must use the unverified entry point (since there will be no
 484     //     null check on a call when the target isn't loaded).
 485     //     This causes problems when verifying the IC because
 486     //     it looks vanilla but is optimized. Code in is_call_to_interpreted
 487     //     is aware of this and weakens its asserts.
 488     if (is_optimized) {
 489       entry      = method_code->verified_entry_point();
 490     } else {
 491       entry      = method_code->entry_point();
 492     }
 493   }
 494   bool far_c2a = entry != NULL && caller_is_nmethod && method_code->is_far_code();
 495   if (entry != NULL && !far_c2a) {
 496     // Call to near compiled code (nmethod or aot).
 497     info.set_compiled_entry(entry, is_optimized ? NULL : receiver_klass, is_optimized);
 498   } else {
 499     if (is_optimized) {
 500       if (far_c2a) {
 501         // Call to aot code from nmethod.
 502         info.set_aot_entry(entry, method());
 503       } else {
 504         // Use stub entry
 505         info.set_interpreter_entry(method()->get_c2i_entry(), method());
 506       }
 507     } else {
 508       // Use icholder entry
 509       assert(method_code == NULL || method_code->is_compiled(), "must be compiled");
 510       CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass);
 511       info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
 512     }
 513   }
 514   assert(info.is_optimized() == is_optimized, "must agree");
 515 }
 516 
 517 
 518 bool CompiledIC::is_icholder_entry(address entry) {
 519   CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
 520   return (cb != NULL && cb->is_adapter_blob());
 521 }
 522 
 523 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) {
 524   // This call site might have become stale so inspect it carefully.
 525   address dest = cm->call_wrapper_at(call_site->addr())->destination();
 526   return is_icholder_entry(dest);
 527 }
 528 
 529 // Release the CompiledICHolder* associated with this call site is there is one.
 530 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site, const CompiledMethod* cm) {
 531   assert(cm->is_nmethod(), "must be nmethod");
 532   // This call site might have become stale so inspect it carefully.
 533   NativeCall* call = nativeCall_at(call_site->addr());
 534   if (is_icholder_entry(call->destination())) {
 535     NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
 536     InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
 537   }
 538 }
 539 
 540 // ----------------------------------------------------------------------------
 541 
 542 void CompiledStaticCall::set_to_clean() {
 543   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
 544   // Reset call site
 545   MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
 546 #ifdef ASSERT
 547   CodeBlob* cb = CodeCache::find_blob_unsafe(instruction_address());
 548   assert(cb != NULL && cb->is_compiled(), "must be compiled");
 549 #endif
 550 
 551   set_destination_mt_safe(resolve_call_stub());
 552 
 553   // Do not reset stub here:  It is too expensive to call find_stub.
 554   // Instead, rely on caller (nmethod::clear_inline_caches) to clear
 555   // both the call and its stub.
 556 }
 557 
 558 bool CompiledStaticCall::is_clean() const {
 559   return destination() == resolve_call_stub();
 560 }
 561 
 562 bool CompiledStaticCall::is_call_to_compiled() const {
 563   return CodeCache::contains(destination());
 564 }
 565 
 566 bool CompiledDirectStaticCall::is_call_to_interpreted() const {
 567   // It is a call to interpreted, if it calls to a stub. Hence, the destination
 568   // must be in the stub part of the nmethod that contains the call
 569   CompiledMethod* cm = CodeCache::find_compiled(instruction_address());
 570   return cm->stub_contains(destination());
 571 }
 572 
 573 bool CompiledDirectStaticCall::is_call_to_far() const {
 574   // It is a call to aot method, if it calls to a stub. Hence, the destination
 575   // must be in the stub part of the nmethod that contains the call
 576   CodeBlob* desc = CodeCache::find_blob(instruction_address());
 577   return desc->as_compiled_method()->stub_contains(destination());
 578 }
 579 
 580 void CompiledStaticCall::set_to_compiled(address entry) {
 581   if (TraceICs) {
 582     ResourceMark rm;
 583     tty->print_cr("%s@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
 584         name(),
 585         p2i(instruction_address()),
 586         p2i(entry));
 587   }
 588   // Call to compiled code
 589   assert(CodeCache::contains(entry), "wrong entry point");
 590   set_destination_mt_safe(entry);
 591 }
 592 
 593 void CompiledStaticCall::set(const StaticCallInfo& info) {
 594   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
 595   MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
 596   // Updating a cache to the wrong entry can cause bugs that are very hard
 597   // to track down - if cache entry gets invalid - we just clean it. In
 598   // this way it is always the same code path that is responsible for
 599   // updating and resolving an inline cache
 600   assert(is_clean(), "do not update a call entry - use clean");
 601 
 602   if (info._to_interpreter) {
 603     // Call to interpreted code
 604     set_to_interpreted(info.callee(), info.entry());
 605 #if INCLUDE_AOT
 606   } else if (info._to_aot) {
 607     // Call to far code
 608     set_to_far(info.callee(), info.entry());
 609 #endif
 610   } else {
 611     set_to_compiled(info.entry());
 612   }
 613 }
 614 
 615 // Compute settings for a CompiledStaticCall. Since we might have to set
 616 // the stub when calling to the interpreter, we need to return arguments.
 617 void CompiledStaticCall::compute_entry(const methodHandle& m, bool caller_is_nmethod, StaticCallInfo& info) {
 618   CompiledMethod* m_code = m->code();
 619   info._callee = m;
 620   if (m_code != NULL && m_code->is_in_use()) {
 621     if (caller_is_nmethod && m_code->is_far_code()) {
 622       // Call to far aot code from nmethod.
 623       info._to_aot = true;
 624     } else {
 625       info._to_aot = false;
 626     }
 627     info._to_interpreter = false;
 628     info._entry  = m_code->verified_entry_point();
 629   } else {
 630     // Callee is interpreted code.  In any case entering the interpreter
 631     // puts a converter-frame on the stack to save arguments.
 632     assert(!m->is_method_handle_intrinsic(), "Compiled code should never call interpreter MH intrinsics");
 633     info._to_interpreter = true;
 634     info._entry      = m()->get_c2i_entry();
 635   }
 636 }
 637 
 638 address CompiledDirectStaticCall::find_stub_for(address instruction, bool is_aot) {
 639   // Find reloc. information containing this call-site
 640   RelocIterator iter((nmethod*)NULL, instruction);
 641   while (iter.next()) {
 642     if (iter.addr() == instruction) {
 643       switch(iter.type()) {
 644         case relocInfo::static_call_type:
 645           return iter.static_call_reloc()->static_stub(is_aot);
 646         // We check here for opt_virtual_call_type, since we reuse the code
 647         // from the CompiledIC implementation
 648         case relocInfo::opt_virtual_call_type:
 649           return iter.opt_virtual_call_reloc()->static_stub(is_aot);
 650         case relocInfo::poll_type:
 651         case relocInfo::poll_return_type: // A safepoint can't overlap a call.
 652         default:
 653           ShouldNotReachHere();
 654       }
 655     }
 656   }
 657   return NULL;
 658 }
 659 
 660 address CompiledDirectStaticCall::find_stub(bool is_aot) {
 661   return CompiledDirectStaticCall::find_stub_for(instruction_address(), is_aot);
 662 }
 663 
 664 address CompiledDirectStaticCall::resolve_call_stub() const {
 665   return SharedRuntime::get_resolve_static_call_stub();
 666 }
 667 
 668 //-----------------------------------------------------------------------------
 669 // Non-product mode code
 670 #ifndef PRODUCT
 671 
 672 void CompiledIC::verify() {
 673   _call->verify();
 674   assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
 675           || is_optimized() || is_megamorphic(), "sanity check");
 676 }
 677 
 678 void CompiledIC::print() {
 679   print_compiled_ic();
 680   tty->cr();
 681 }
 682 
 683 void CompiledIC::print_compiled_ic() {
 684   tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
 685              p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value()));
 686 }
 687 
 688 void CompiledDirectStaticCall::print() {
 689   tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address()));
 690   if (is_clean()) {
 691     tty->print("clean");
 692   } else if (is_call_to_compiled()) {
 693     tty->print("compiled");
 694   } else if (is_call_to_far()) {
 695     tty->print("far");
 696   } else if (is_call_to_interpreted()) {
 697     tty->print("interpreted");
 698   }
 699   tty->cr();
 700 }
 701 
 702 #endif // !PRODUCT