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 "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 "oops/method.hpp"
  37 #include "oops/oop.inline.hpp"
  38 #include "oops/symbol.hpp"
  39 #include "runtime/icache.hpp"
  40 #include "runtime/sharedRuntime.hpp"
  41 #include "runtime/stubRoutines.hpp"
  42 #include "utilities/events.hpp"
  43 
  44 
  45 // Every time a compiled IC is changed or its type is being accessed,
  46 // either the CompiledIC_lock must be set or we must be at a safe point.
  47 
  48 
  49 // Release the CompiledICHolder* associated with this call site is there is one.
  50 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
  51   // This call site might have become stale so inspect it carefully.
  52   NativeCall* call = nativeCall_at(call_site->addr());
  53   if (is_icholder_entry(call->destination())) {
  54     NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
  55     InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
  56   }
  57 }
  58 
  59 
  60 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
  61   // This call site might have become stale so inspect it carefully.
  62   NativeCall* call = nativeCall_at(call_site->addr());
  63   return is_icholder_entry(call->destination());
  64 }
  65 
  66 
  67 //-----------------------------------------------------------------------------
  68 // Low-level access to an inline cache. Private, since they might not be
  69 // MT-safe to use.
  70 
  71 void* CompiledIC::cached_value() const {
  72   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
  73   assert (!is_optimized(), "an optimized virtual call does not have a cached metadata");
  74 
  75   if (!is_in_transition_state()) {
  76     void* data = (void*)_value->data();
  77     // If we let the metadata value here be initialized to zero...
  78     assert(data != NULL || Universe::non_oop_word() == NULL,
  79            "no raw nulls in CompiledIC metadatas, because of patching races");
  80     return (data == (void*)Universe::non_oop_word()) ? NULL : data;
  81   } else {
  82     return InlineCacheBuffer::cached_value_for((CompiledIC *)this);
  83   }
  84 }
  85 
  86 
  87 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) {
  88   assert(entry_point != NULL, "must set legal entry point");
  89   assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
  90   assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata");
  91   assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata");
  92 
  93   assert(!is_icholder || is_icholder_entry(entry_point), "must be");
  94 
  95   // Don't use ic_destination for this test since that forwards
  96   // through ICBuffer instead of returning the actual current state of
  97   // the CompiledIC.
  98   if (is_icholder_entry(_ic_call->destination())) {
  99     // When patching for the ICStub case the cached value isn't
 100     // overwritten until the ICStub copied into the CompiledIC during
 101     // the next safepoint.  Make sure that the CompiledICHolder* is
 102     // marked for release at this point since it won't be identifiable
 103     // once the entry point is overwritten.
 104     InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data());
 105   }
 106 
 107   if (TraceCompiledIC) {
 108     tty->print("  ");
 109     print_compiled_ic();
 110     tty->print(" changing destination to " INTPTR_FORMAT, entry_point);
 111     if (!is_optimized()) {
 112       tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", (address)cache);
 113     }
 114     if (is_icstub) {
 115       tty->print(" (icstub)");
 116     }
 117     tty->cr();
 118   }
 119 
 120   {
 121   MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
 122 #ifdef ASSERT
 123   CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call);
 124   assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
 125 #endif
 126   _ic_call->set_destination_mt_safe(entry_point);
 127 }
 128 
 129   if (is_optimized() || is_icstub) {
 130     // Optimized call sites don't have a cache value and ICStub call
 131     // sites only change the entry point.  Changing the value in that
 132     // case could lead to MT safety issues.
 133     assert(cache == NULL, "must be null");
 134     return;
 135   }
 136 
 137   if (cache == NULL)  cache = (void*)Universe::non_oop_word();
 138 
 139   _value->set_data((intptr_t)cache);
 140 }
 141 
 142 
 143 void CompiledIC::set_ic_destination(ICStub* stub) {
 144   internal_set_ic_destination(stub->code_begin(), true, NULL, false);
 145 }
 146 
 147 
 148 
 149 address CompiledIC::ic_destination() const {
 150  assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 151  if (!is_in_transition_state()) {
 152    return _ic_call->destination();
 153  } else {
 154    return InlineCacheBuffer::ic_destination_for((CompiledIC *)this);
 155  }
 156 }
 157 
 158 
 159 bool CompiledIC::is_in_transition_state() const {
 160   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 161   return InlineCacheBuffer::contains(_ic_call->destination());
 162 }
 163 
 164 
 165 bool CompiledIC::is_icholder_call() const {
 166   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 167   return !_is_optimized && is_icholder_entry(ic_destination());
 168 }
 169 
 170 // Returns native address of 'call' instruction in inline-cache. Used by
 171 // the InlineCacheBuffer when it needs to find the stub.
 172 address CompiledIC::stub_address() const {
 173   assert(is_in_transition_state(), "should only be called when we are in a transition state");
 174   return _ic_call->destination();
 175 }
 176 
 177 
 178 //-----------------------------------------------------------------------------
 179 // High-level access to an inline cache. Guaranteed to be MT-safe.
 180 
 181 
 182 void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
 183   methodHandle method = call_info->selected_method();
 184   bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index());
 185   assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 186   assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
 187   assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
 188 
 189   address entry;
 190   if (is_invoke_interface) {
 191     int index = klassItable::compute_itable_index(call_info->resolved_method()());
 192     entry = VtableStubs::create_stub(false, index, method());
 193     assert(entry != NULL, "entry not computed");
 194     InstanceKlass* k = call_info->resolved_method()->method_holder();
 195     assert(k->is_interface(), "sanity check");
 196     InlineCacheBuffer::create_transition_stub(this, k, entry);
 197   } else {
 198     // Can be different than method->vtable_index(), due to package-private etc.
 199     int vtable_index = call_info->vtable_index();
 200     entry = VtableStubs::create_stub(true, vtable_index, method());
 201     InlineCacheBuffer::create_transition_stub(this, method(), entry);
 202   }
 203 
 204   if (TraceICs) {
 205     ResourceMark rm;
 206     tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
 207                    instruction_address(), method->print_value_string(), entry);
 208   }
 209 
 210   // We can't check this anymore. With lazy deopt we could have already
 211   // cleaned this IC entry before we even return. This is possible if
 212   // we ran out of space in the inline cache buffer trying to do the
 213   // set_next and we safepointed to free up space. This is a benign
 214   // race because the IC entry was complete when we safepointed so
 215   // cleaning it immediately is harmless.
 216   // assert(is_megamorphic(), "sanity check");
 217 }
 218 
 219 
 220 // true if destination is megamorphic stub
 221 bool CompiledIC::is_megamorphic() const {
 222   assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 223   assert(!is_optimized(), "an optimized call cannot be megamorphic");
 224 
 225   // Cannot rely on cached_value. It is either an interface or a method.
 226   return VtableStubs::is_entry_point(ic_destination());
 227 }
 228 
 229 bool CompiledIC::is_call_to_compiled() const {
 230   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 231 
 232   // Use unsafe, since an inline cache might point to a zombie method. However, the zombie
 233   // method is guaranteed to still exist, since we only remove methods after all inline caches
 234   // has been cleaned up
 235   CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
 236   bool is_monomorphic = (cb != NULL && cb->is_nmethod());
 237   // Check that the cached_value is a klass for non-optimized monomorphic calls
 238   // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
 239   // for calling directly to vep without using the inline cache (i.e., cached_value == NULL)
 240 #ifdef ASSERT
 241   CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
 242   bool is_c1_method = caller->is_compiled_by_c1();
 243   assert( is_c1_method ||
 244          !is_monomorphic ||
 245          is_optimized() ||
 246          (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
 247 #endif // ASSERT
 248   return is_monomorphic;
 249 }
 250 
 251 
 252 bool CompiledIC::is_call_to_interpreted() const {
 253   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 254   // Call to interpreter if destination is either calling to a stub (if it
 255   // is optimized), or calling to an I2C blob
 256   bool is_call_to_interpreted = false;
 257   if (!is_optimized()) {
 258     // must use unsafe because the destination can be a zombie (and we're cleaning)
 259     // and the print_compiled_ic code wants to know if site (in the non-zombie)
 260     // is to the interpreter.
 261     CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
 262     is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
 263     assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
 264   } else {
 265     // Check if we are calling into our own codeblob (i.e., to a stub)
 266     CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
 267     address dest = ic_destination();
 268 #ifdef ASSERT
 269     {
 270       CodeBlob* db = CodeCache::find_blob_unsafe(dest);
 271       assert(!db->is_adapter_blob(), "must use stub!");
 272     }
 273 #endif /* ASSERT */
 274     is_call_to_interpreted = cb->contains(dest);
 275   }
 276   return is_call_to_interpreted;
 277 }
 278 
 279 
 280 void CompiledIC::set_to_clean() {
 281   assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
 282   if (TraceInlineCacheClearing || TraceICs) {
 283     tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address());
 284     print();
 285   }
 286 
 287   address entry;
 288   if (is_optimized()) {
 289     entry = SharedRuntime::get_resolve_opt_virtual_call_stub();
 290   } else {
 291     entry = SharedRuntime::get_resolve_virtual_call_stub();
 292   }
 293 
 294   // A zombie transition will always be safe, since the metadata has already been set to NULL, so
 295   // we only need to patch the destination
 296   bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint();
 297 
 298   if (safe_transition) {
 299     // Kill any leftover stub we might have too
 300     if (is_in_transition_state()) {
 301       ICStub* old_stub = ICStub_from_destination_address(stub_address());
 302       old_stub->clear();
 303     }
 304     if (is_optimized()) {
 305     set_ic_destination(entry);
 306   } else {
 307       set_ic_destination_and_value(entry, (void*)NULL);
 308     }
 309   } else {
 310     // Unsafe transition - create stub.
 311     InlineCacheBuffer::create_transition_stub(this, NULL, entry);
 312   }
 313   // We can't check this anymore. With lazy deopt we could have already
 314   // cleaned this IC entry before we even return. This is possible if
 315   // we ran out of space in the inline cache buffer trying to do the
 316   // set_next and we safepointed to free up space. This is a benign
 317   // race because the IC entry was complete when we safepointed so
 318   // cleaning it immediately is harmless.
 319   // assert(is_clean(), "sanity check");
 320 }
 321 
 322 
 323 bool CompiledIC::is_clean() const {
 324   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 325   bool is_clean = false;
 326   address dest = ic_destination();
 327   is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() ||
 328              dest == SharedRuntime::get_resolve_virtual_call_stub();
 329   assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
 330   return is_clean;
 331 }
 332 
 333 
 334 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
 335   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
 336   // Updating a cache to the wrong entry can cause bugs that are very hard
 337   // to track down - if cache entry gets invalid - we just clean it. In
 338   // this way it is always the same code path that is responsible for
 339   // updating and resolving an inline cache
 340   //
 341   // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
 342   // callsites. In addition ic_miss code will update a site to monomorphic if it determines
 343   // that an monomorphic call to the interpreter can now be monomorphic to compiled code.
 344   //
 345   // In both of these cases the only thing being modifed is the jump/call target and these
 346   // transitions are mt_safe
 347 
 348   Thread *thread = Thread::current();
 349   if (info.to_interpreter()) {
 350     // Call to interpreter
 351     if (info.is_optimized() && is_optimized()) {
 352        assert(is_clean(), "unsafe IC path");
 353        MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
 354       // the call analysis (callee structure) specifies that the call is optimized
 355       // (either because of CHA or the static target is final)
 356       // At code generation time, this call has been emitted as static call
 357       // Call via stub
 358       assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
 359       CompiledStaticCall* csc = compiledStaticCall_at(instruction_address());
 360       methodHandle method (thread, (Method*)info.cached_metadata());
 361       csc->set_to_interpreted(method, info.entry());
 362       if (TraceICs) {
 363          ResourceMark rm(thread);
 364          tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s",
 365            instruction_address(),
 366            method->print_value_string());
 367       }
 368     } else {
 369       // Call via method-klass-holder
 370       InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry());
 371       if (TraceICs) {
 372          ResourceMark rm(thread);
 373          tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", instruction_address());
 374       }
 375     }
 376   } else {
 377     // Call to compiled code
 378     bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
 379 #ifdef ASSERT
 380     CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
 381     assert (cb->is_nmethod(), "must be compiled!");
 382 #endif /* ASSERT */
 383 
 384     // This is MT safe if we come from a clean-cache and go through a
 385     // non-verified entry point
 386     bool safe = SafepointSynchronize::is_at_safepoint() ||
 387                 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
 388 
 389     if (!safe) {
 390       InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry());
 391     } else {
 392       if (is_optimized()) {
 393       set_ic_destination(info.entry());
 394       } else {
 395         set_ic_destination_and_value(info.entry(), info.cached_metadata());
 396       }
 397     }
 398 
 399     if (TraceICs) {
 400       ResourceMark rm(thread);
 401       assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
 402       tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
 403         instruction_address(),
 404         ((Klass*)info.cached_metadata())->print_value_string(),
 405         (safe) ? "" : "via stub");
 406     }
 407   }
 408   // We can't check this anymore. With lazy deopt we could have already
 409   // cleaned this IC entry before we even return. This is possible if
 410   // we ran out of space in the inline cache buffer trying to do the
 411   // set_next and we safepointed to free up space. This is a benign
 412   // race because the IC entry was complete when we safepointed so
 413   // cleaning it immediately is harmless.
 414   // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
 415 }
 416 
 417 
 418 // is_optimized: Compiler has generated an optimized call (i.e., no inline
 419 // cache) static_bound: The call can be static bound (i.e, no need to use
 420 // inline cache)
 421 void CompiledIC::compute_monomorphic_entry(methodHandle method,
 422                                            KlassHandle receiver_klass,
 423                                            bool is_optimized,
 424                                            bool static_bound,
 425                                            CompiledICInfo& info,
 426                                            TRAPS) {
 427   nmethod* method_code = method->code();
 428   address entry = NULL;
 429   if (method_code != NULL) {
 430     // Call to compiled code
 431     if (static_bound || is_optimized) {
 432       entry      = method_code->verified_entry_point();
 433     } else {
 434       entry      = method_code->entry_point();
 435     }
 436   }
 437   if (entry != NULL) {
 438     // Call to compiled code
 439     info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized);
 440   } else {
 441     // Note: the following problem exists with Compiler1:
 442     //   - at compile time we may or may not know if the destination is final
 443     //   - if we know that the destination is final, we will emit an optimized
 444     //     virtual call (no inline cache), and need a Method* to make a call
 445     //     to the interpreter
 446     //   - if we do not know if the destination is final, we emit a standard
 447     //     virtual call, and use CompiledICHolder to call interpreted code
 448     //     (no static call stub has been generated)
 449     //     However in that case we will now notice it is static_bound
 450     //     and convert the call into what looks to be an optimized
 451     //     virtual call. This causes problems in verifying the IC because
 452     //     it look vanilla but is optimized. Code in is_call_to_interpreted
 453     //     is aware of this and weakens its asserts.
 454 
 455     // static_bound should imply is_optimized -- otherwise we have a
 456     // performance bug (statically-bindable method is called via
 457     // dynamically-dispatched call note: the reverse implication isn't
 458     // necessarily true -- the call may have been optimized based on compiler
 459     // analysis (static_bound is only based on "final" etc.)
 460 #ifdef COMPILER2
 461 #ifdef TIERED
 462 #if defined(ASSERT)
 463     // can't check the assert because we don't have the CompiledIC with which to
 464     // find the address if the call instruction.
 465     //
 466     // CodeBlob* cb = find_blob_unsafe(instruction_address());
 467     // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized");
 468 #endif // ASSERT
 469 #else
 470     assert(!static_bound || is_optimized, "static_bound should imply is_optimized");
 471 #endif // TIERED
 472 #endif // COMPILER2
 473     if (is_optimized) {
 474       // Use stub entry
 475       info.set_interpreter_entry(method()->get_c2i_entry(), method());
 476     } else {
 477       // Use icholder entry
 478       CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass());
 479       info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder);
 480     }
 481   }
 482   assert(info.is_optimized() == is_optimized, "must agree");
 483 }
 484 
 485 
 486 bool CompiledIC::is_icholder_entry(address entry) {
 487   CodeBlob* cb = CodeCache::find_blob_unsafe(entry);
 488   return (cb != NULL && cb->is_adapter_blob());
 489 }
 490 
 491 
 492 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
 493   : _ic_call(call)
 494 {
 495   address ic_call = call->instruction_address();
 496 
 497   assert(ic_call != NULL, "ic_call address must be set");
 498   assert(nm != NULL, "must pass nmethod");
 499   assert(nm->contains(ic_call),   "must be in nmethod");
 500 
 501   // search for the ic_call at the given address
 502   RelocIterator iter(nm, ic_call, ic_call+1);
 503   bool ret = iter.next();
 504   assert(ret == true, "relocInfo must exist at this address");
 505   assert(iter.addr() == ic_call, "must find ic_call");
 506   if (iter.type() == relocInfo::virtual_call_type) {
 507     virtual_call_Relocation* r = iter.virtual_call_reloc();
 508     _is_optimized = false;
 509     _value = nativeMovConstReg_at(r->cached_value());
 510   } else {
 511     assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
 512     _is_optimized = true;
 513     _value = NULL;
 514 }
 515 }
 516 
 517 
 518 // ----------------------------------------------------------------------------
 519 
 520 void CompiledStaticCall::set_to_clean() {
 521   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
 522   // Reset call site
 523   MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
 524 #ifdef ASSERT
 525   CodeBlob* cb = CodeCache::find_blob_unsafe(this);
 526   assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
 527 #endif
 528   set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub());
 529 
 530   // Do not reset stub here:  It is too expensive to call find_stub.
 531   // Instead, rely on caller (nmethod::clear_inline_caches) to clear
 532   // both the call and its stub.
 533 }
 534 
 535 
 536 bool CompiledStaticCall::is_clean() const {
 537   return destination() == SharedRuntime::get_resolve_static_call_stub();
 538 }
 539 
 540 bool CompiledStaticCall::is_call_to_compiled() const {
 541   return CodeCache::contains(destination());
 542 }
 543 
 544 
 545 bool CompiledStaticCall::is_call_to_interpreted() const {
 546   // It is a call to interpreted, if it calls to a stub. Hence, the destination
 547   // must be in the stub part of the nmethod that contains the call
 548   nmethod* nm = CodeCache::find_nmethod(instruction_address());
 549   return nm->stub_contains(destination());
 550 }
 551 
 552 
 553 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
 554   address stub=find_stub();
 555   assert(stub!=NULL, "stub not found");
 556 
 557   if (TraceICs) {
 558     ResourceMark rm;
 559     tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
 560                   instruction_address(),
 561                   callee->name_and_sig_as_C_string());
 562   }
 563 
 564   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + comp_to_int_load_offset);   // creation also verifies the object
 565   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
 566 
 567   assert(method_holder->data()    == 0           || method_holder->data()    == (intptr_t)callee(), "a) MT-unsafe modification of inline cache");
 568   assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache");
 569 
 570   // Update stub
 571   method_holder->set_data((intptr_t)callee());
 572   jump->set_jump_destination(entry);
 573 
 574   // Update jump to call
 575   set_destination_mt_safe(stub);
 576 }
 577 
 578 
 579 void CompiledStaticCall::set(const StaticCallInfo& info) {
 580   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
 581   MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
 582   // Updating a cache to the wrong entry can cause bugs that are very hard
 583   // to track down - if cache entry gets invalid - we just clean it. In
 584   // this way it is always the same code path that is responsible for
 585   // updating and resolving an inline cache
 586   assert(is_clean(), "do not update a call entry - use clean");
 587 
 588   if (info._to_interpreter) {
 589     // Call to interpreted code
 590     set_to_interpreted(info.callee(), info.entry());
 591   } else {
 592     if (TraceICs) {
 593       ResourceMark rm;
 594       tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
 595                     instruction_address(),
 596                     info.entry());
 597     }
 598     // Call to compiled code
 599     assert (CodeCache::contains(info.entry()), "wrong entry point");
 600     set_destination_mt_safe(info.entry());
 601   }
 602 }
 603 
 604 
 605 // Compute settings for a CompiledStaticCall. Since we might have to set
 606 // the stub when calling to the interpreter, we need to return arguments.
 607 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) {
 608   nmethod* m_code = m->code();
 609   info._callee = m;
 610   if (m_code != NULL) {
 611     info._to_interpreter = false;
 612     info._entry  = m_code->verified_entry_point();
 613   } else {
 614     // Callee is interpreted code.  In any case entering the interpreter
 615     // puts a converter-frame on the stack to save arguments.
 616     info._to_interpreter = true;
 617     info._entry      = m()->get_c2i_entry();
 618   }
 619 }
 620 
 621 
 622 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
 623   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
 624   // Reset stub
 625   address stub = static_stub->addr();
 626   assert(stub!=NULL, "stub not found");
 627   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + comp_to_int_load_offset);   // creation also verifies the object
 628   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
 629   method_holder->set_data(0);
 630   jump->set_jump_destination((address)-1);
 631 }
 632 
 633 
 634 address CompiledStaticCall::find_stub() {
 635   // Find reloc. information containing this call-site
 636   RelocIterator iter((nmethod*)NULL, instruction_address());
 637   while (iter.next()) {
 638     if (iter.addr() == instruction_address()) {
 639       switch(iter.type()) {
 640         case relocInfo::static_call_type:
 641           return iter.static_call_reloc()->static_stub();
 642         // We check here for opt_virtual_call_type, since we reuse the code
 643         // from the CompiledIC implementation
 644         case relocInfo::opt_virtual_call_type:
 645           return iter.opt_virtual_call_reloc()->static_stub();
 646         case relocInfo::poll_type:
 647         case relocInfo::poll_return_type: // A safepoint can't overlap a call.
 648         default:
 649           ShouldNotReachHere();
 650       }
 651     }
 652   }
 653   return NULL;
 654 }
 655 
 656 
 657 //-----------------------------------------------------------------------------
 658 // Non-product mode code
 659 #ifndef PRODUCT
 660 
 661 void CompiledIC::verify() {
 662   // make sure code pattern is actually a call imm32 instruction
 663   _ic_call->verify();
 664   if (os::is_MP()) {
 665     _ic_call->verify_alignment();
 666   }
 667   assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
 668           || is_optimized() || is_megamorphic(), "sanity check");
 669 }
 670 
 671 
 672 void CompiledIC::print() {
 673   print_compiled_ic();
 674   tty->cr();
 675 }
 676 
 677 
 678 void CompiledIC::print_compiled_ic() {
 679   tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
 680              instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination(), is_optimized() ? NULL : cached_value());
 681 }
 682 
 683 
 684 void CompiledStaticCall::print() {
 685   tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address());
 686   if (is_clean()) {
 687     tty->print("clean");
 688   } else if (is_call_to_compiled()) {
 689     tty->print("compiled");
 690   } else if (is_call_to_interpreted()) {
 691     tty->print("interpreted");
 692   }
 693   tty->cr();
 694 }
 695 
 696 void CompiledStaticCall::verify() {
 697   // Verify call
 698   NativeCall::verify();
 699   if (os::is_MP()) {
 700     verify_alignment();
 701   }
 702 
 703   // Verify stub
 704   address stub = find_stub();
 705   assert(stub != NULL, "no stub found for static call");
 706   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + comp_to_int_load_offset);   // creation also verifies the object
 707 
 708   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
 709 
 710   // Verify state
 711   assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
 712 }
 713 
 714 #endif // !PRODUCT
 715 
 716 #ifndef COMPILER2
 717 const int CompiledStaticCall::comp_to_int_load_offset = 0;
 718 #endif