1 /*
   2  * Copyright (c) 1998, 2022, 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 "ci/ciCallSite.hpp"
  27 #include "ci/ciMethodHandle.hpp"
  28 #include "ci/ciSymbols.hpp"
  29 #include "classfile/vmSymbols.hpp"
  30 #include "compiler/compileBroker.hpp"
  31 #include "compiler/compileLog.hpp"
  32 #include "interpreter/linkResolver.hpp"
  33 #include "opto/addnode.hpp"
  34 #include "opto/callGenerator.hpp"
  35 #include "opto/castnode.hpp"
  36 #include "opto/cfgnode.hpp"
  37 #include "opto/mulnode.hpp"
  38 #include "opto/parse.hpp"
  39 #include "opto/rootnode.hpp"
  40 #include "opto/runtime.hpp"
  41 #include "opto/subnode.hpp"
  42 #include "prims/methodHandles.hpp"
  43 #include "runtime/sharedRuntime.hpp"
  44 
  45 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
  46   if (TraceTypeProfile || C->print_inlining()) {
  47     outputStream* out = tty;
  48     if (!C->print_inlining()) {
  49       if (!PrintOpto && !PrintCompilation) {
  50         method->print_short_name();
  51         tty->cr();
  52       }
  53       CompileTask::print_inlining_tty(prof_method, depth, bci);
  54     } else {
  55       out = C->print_inlining_stream();
  56     }
  57     CompileTask::print_inline_indent(depth, out);
  58     out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
  59     stringStream ss;
  60     prof_klass->name()->print_symbol_on(&ss);
  61     out->print("%s", ss.as_string());
  62     out->cr();
  63   }
  64 }
  65 
  66 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
  67                                        JVMState* jvms, bool allow_inline,
  68                                        float prof_factor, ciKlass* speculative_receiver_type,
  69                                        bool allow_intrinsics) {
  70   assert(callee != NULL, "failed method resolution");
  71 
  72   ciMethod*       caller      = jvms->method();
  73   int             bci         = jvms->bci();
  74   Bytecodes::Code bytecode    = caller->java_code_at_bci(bci);
  75   ciMethod*       orig_callee = caller->get_method_at_bci(bci);
  76 
  77   const bool is_virtual_or_interface = (bytecode == Bytecodes::_invokevirtual) ||
  78                                        (bytecode == Bytecodes::_invokeinterface) ||
  79                                        (orig_callee->intrinsic_id() == vmIntrinsics::_linkToVirtual) ||
  80                                        (orig_callee->intrinsic_id() == vmIntrinsics::_linkToInterface);
  81 
  82   // Dtrace currently doesn't work unless all calls are vanilla
  83   if (env()->dtrace_method_probes()) {
  84     allow_inline = false;
  85   }
  86 
  87   // Note: When we get profiling during stage-1 compiles, we want to pull
  88   // from more specific profile data which pertains to this inlining.
  89   // Right now, ignore the information in jvms->caller(), and do method[bci].
  90   ciCallProfile profile = caller->call_profile_at_bci(bci);
  91 
  92   // See how many times this site has been invoked.
  93   int site_count = profile.count();
  94   int receiver_count = -1;
  95   if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
  96     // Receivers in the profile structure are ordered by call counts
  97     // so that the most called (major) receiver is profile.receiver(0).
  98     receiver_count = profile.receiver_count(0);
  99   }
 100 
 101   CompileLog* log = this->log();
 102   if (log != NULL) {
 103     int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
 104     int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
 105     log->begin_elem("call method='%d' count='%d' prof_factor='%f'",
 106                     log->identify(callee), site_count, prof_factor);
 107     if (call_does_dispatch)  log->print(" virtual='1'");
 108     if (allow_inline)     log->print(" inline='1'");
 109     if (receiver_count >= 0) {
 110       log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
 111       if (profile.has_receiver(1)) {
 112         log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
 113       }
 114     }
 115     if (callee->is_method_handle_intrinsic()) {
 116       log->print(" method_handle_intrinsic='1'");
 117     }
 118     log->end_elem();
 119   }
 120 
 121   // Special case the handling of certain common, profitable library
 122   // methods.  If these methods are replaced with specialized code,
 123   // then we return it as the inlined version of the call.
 124   CallGenerator* cg_intrinsic = NULL;
 125   if (allow_inline && allow_intrinsics) {
 126     CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
 127     if (cg != NULL) {
 128       if (cg->is_predicated()) {
 129         // Code without intrinsic but, hopefully, inlined.
 130         CallGenerator* inline_cg = this->call_generator(callee,
 131               vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
 132         if (inline_cg != NULL) {
 133           cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg);
 134         }
 135       }
 136 
 137       // If intrinsic does the virtual dispatch, we try to use the type profile
 138       // first, and hopefully inline it as the regular virtual call below.
 139       // We will retry the intrinsic if nothing had claimed it afterwards.
 140       if (cg->does_virtual_dispatch()) {
 141         cg_intrinsic = cg;
 142         cg = NULL;
 143       } else if (IncrementalInline && should_delay_vector_inlining(callee, jvms)) {
 144         return CallGenerator::for_late_inline(callee, cg);
 145       } else {
 146         return cg;
 147       }
 148     }
 149   }
 150 
 151   // Do method handle calls.
 152   // NOTE: This must happen before normal inlining logic below since
 153   // MethodHandle.invoke* are native methods which obviously don't
 154   // have bytecodes and so normal inlining fails.
 155   if (callee->is_method_handle_intrinsic()) {
 156     CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, allow_inline);
 157     return cg;
 158   }
 159 
 160   // Attempt to inline...
 161   if (allow_inline) {
 162     // The profile data is only partly attributable to this caller,
 163     // scale back the call site information.
 164     float past_uses = jvms->method()->scale_count(site_count, prof_factor);
 165     // This is the number of times we expect the call code to be used.
 166     float expected_uses = past_uses;
 167 
 168     // Try inlining a bytecoded method:
 169     if (!call_does_dispatch) {
 170       InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
 171       bool should_delay = AlwaysIncrementalInline;
 172       if (ilt->ok_to_inline(callee, jvms, profile, should_delay)) {
 173         CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
 174         // For optimized virtual calls assert at runtime that receiver object
 175         // is a subtype of the inlined method holder. CHA can report a method
 176         // as a unique target under an abstract method, but receiver type
 177         // sometimes has a broader type. Similar scenario is possible with
 178         // default methods when type system loses information about implemented
 179         // interfaces.
 180         if (cg != NULL && is_virtual_or_interface && !callee->is_static()) {
 181           CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
 182               Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
 183 
 184           cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
 185         }
 186         if (cg != NULL) {
 187           // Delay the inlining of this method to give us the
 188           // opportunity to perform some high level optimizations
 189           // first.
 190           if (should_delay_string_inlining(callee, jvms)) {
 191             return CallGenerator::for_string_late_inline(callee, cg);
 192           } else if (should_delay_boxing_inlining(callee, jvms)) {
 193             return CallGenerator::for_boxing_late_inline(callee, cg);
 194           } else if (should_delay_vector_reboxing_inlining(callee, jvms)) {
 195             return CallGenerator::for_vector_reboxing_late_inline(callee, cg);
 196           } else if (should_delay) {
 197             return CallGenerator::for_late_inline(callee, cg);
 198           } else {
 199             return cg;
 200           }
 201         }
 202       }
 203     }
 204 
 205     // Try using the type profile.
 206     if (call_does_dispatch && site_count > 0 && UseTypeProfile) {
 207       // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
 208       bool have_major_receiver = profile.has_receiver(0) && (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
 209       ciMethod* receiver_method = NULL;
 210 
 211       int morphism = profile.morphism();
 212       if (speculative_receiver_type != NULL) {
 213         if (!too_many_traps_or_recompiles(caller, bci, Deoptimization::Reason_speculate_class_check)) {
 214           // We have a speculative type, we should be able to resolve
 215           // the call. We do that before looking at the profiling at
 216           // this invoke because it may lead to bimorphic inlining which
 217           // a speculative type should help us avoid.
 218           receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 219                                                    speculative_receiver_type);
 220           if (receiver_method == NULL) {
 221             speculative_receiver_type = NULL;
 222           } else {
 223             morphism = 1;
 224           }
 225         } else {
 226           // speculation failed before. Use profiling at the call
 227           // (could allow bimorphic inlining for instance).
 228           speculative_receiver_type = NULL;
 229         }
 230       }
 231       if (receiver_method == NULL &&
 232           (have_major_receiver || morphism == 1 ||
 233            (morphism == 2 && UseBimorphicInlining))) {
 234         // receiver_method = profile.method();
 235         // Profiles do not suggest methods now.  Look it up in the major receiver.
 236         receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 237                                                       profile.receiver(0));
 238       }
 239       if (receiver_method != NULL) {
 240         // The single majority receiver sufficiently outweighs the minority.
 241         CallGenerator* hit_cg = this->call_generator(receiver_method,
 242               vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
 243         if (hit_cg != NULL) {
 244           // Look up second receiver.
 245           CallGenerator* next_hit_cg = NULL;
 246           ciMethod* next_receiver_method = NULL;
 247           if (morphism == 2 && UseBimorphicInlining) {
 248             next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 249                                                                profile.receiver(1));
 250             if (next_receiver_method != NULL) {
 251               next_hit_cg = this->call_generator(next_receiver_method,
 252                                   vtable_index, !call_does_dispatch, jvms,
 253                                   allow_inline, prof_factor);
 254               if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
 255                   have_major_receiver && UseOnlyInlinedBimorphic) {
 256                   // Skip if we can't inline second receiver's method
 257                   next_hit_cg = NULL;
 258               }
 259             }
 260           }
 261           CallGenerator* miss_cg;
 262           Deoptimization::DeoptReason reason = (morphism == 2
 263                                                ? Deoptimization::Reason_bimorphic
 264                                                : Deoptimization::reason_class_check(speculative_receiver_type != NULL));
 265           if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
 266               !too_many_traps_or_recompiles(caller, bci, reason)
 267              ) {
 268             // Generate uncommon trap for class check failure path
 269             // in case of monomorphic or bimorphic virtual call site.
 270             miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
 271                         Deoptimization::Action_maybe_recompile);
 272           } else {
 273             // Generate virtual call for class check failure path
 274             // in case of polymorphic virtual call site.
 275             miss_cg = (IncrementalInlineVirtual ? CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor)
 276                                                 : CallGenerator::for_virtual_call(callee, vtable_index));
 277           }
 278           if (miss_cg != NULL) {
 279             if (next_hit_cg != NULL) {
 280               assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation");
 281               trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
 282               // We don't need to record dependency on a receiver here and below.
 283               // Whenever we inline, the dependency is added by Parse::Parse().
 284               miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
 285             }
 286             if (miss_cg != NULL) {
 287               ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0);
 288               trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, k, site_count, receiver_count);
 289               float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0);
 290               CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
 291               if (cg != NULL)  return cg;
 292             }
 293           }
 294         }
 295       }
 296     }
 297 
 298     // If there is only one implementor of this interface then we
 299     // may be able to bind this invoke directly to the implementing
 300     // klass but we need both a dependence on the single interface
 301     // and on the method we bind to. Additionally since all we know
 302     // about the receiver type is that it's supposed to implement the
 303     // interface we have to insert a check that it's the class we
 304     // expect.  Interface types are not checked by the verifier so
 305     // they are roughly equivalent to Object.
 306     // The number of implementors for declared_interface is less or
 307     // equal to the number of implementors for target->holder() so
 308     // if number of implementors of target->holder() == 1 then
 309     // number of implementors for decl_interface is 0 or 1. If
 310     // it's 0 then no class implements decl_interface and there's
 311     // no point in inlining.
 312     if (call_does_dispatch && bytecode == Bytecodes::_invokeinterface) {
 313       ciInstanceKlass* declared_interface =
 314           caller->get_declared_method_holder_at_bci(bci)->as_instance_klass();
 315       ciInstanceKlass* singleton = declared_interface->unique_implementor();
 316 
 317       if (singleton != NULL) {
 318         assert(singleton != declared_interface, "not a unique implementor");
 319 
 320         ciMethod* cha_monomorphic_target =
 321             callee->find_monomorphic_target(caller->holder(), declared_interface, singleton);
 322 
 323         if (cha_monomorphic_target != NULL &&
 324             cha_monomorphic_target->holder() != env()->Object_klass()) { // subtype check against Object is useless
 325           ciKlass* holder = cha_monomorphic_target->holder();
 326 
 327           // Try to inline the method found by CHA. Inlined method is guarded by the type check.
 328           CallGenerator* hit_cg = call_generator(cha_monomorphic_target,
 329               vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
 330 
 331           // Deoptimize on type check fail. The interpreter will throw ICCE for us.
 332           CallGenerator* miss_cg = CallGenerator::for_uncommon_trap(callee,
 333               Deoptimization::Reason_class_check, Deoptimization::Action_none);
 334 
 335           ciKlass* constraint = (holder->is_subclass_of(singleton) ? holder : singleton); // avoid upcasts
 336           CallGenerator* cg = CallGenerator::for_guarded_call(constraint, miss_cg, hit_cg);
 337           if (hit_cg != NULL && cg != NULL) {
 338             dependencies()->assert_unique_implementor(declared_interface, singleton);
 339             dependencies()->assert_unique_concrete_method(declared_interface, cha_monomorphic_target, declared_interface, callee);
 340             return cg;
 341           }
 342         }
 343       }
 344     } // call_does_dispatch && bytecode == Bytecodes::_invokeinterface
 345 
 346     // Nothing claimed the intrinsic, we go with straight-forward inlining
 347     // for already discovered intrinsic.
 348     if (allow_intrinsics && cg_intrinsic != NULL) {
 349       assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
 350       return cg_intrinsic;
 351     }
 352   } // allow_inline
 353 
 354   // There was no special inlining tactic, or it bailed out.
 355   // Use a more generic tactic, like a simple call.
 356   if (call_does_dispatch) {
 357     const char* msg = "virtual call";
 358     if (C->print_inlining()) {
 359       print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg);
 360     }
 361     C->log_inline_failure(msg);
 362     if (IncrementalInlineVirtual && allow_inline) {
 363       return CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor); // attempt to inline through virtual call later
 364     } else {
 365       return CallGenerator::for_virtual_call(callee, vtable_index);
 366     }
 367   } else {
 368     // Class Hierarchy Analysis or Type Profile reveals a unique target, or it is a static or special call.
 369     CallGenerator* cg = CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
 370     // For optimized virtual calls assert at runtime that receiver object
 371     // is a subtype of the method holder.
 372     if (cg != NULL && is_virtual_or_interface && !callee->is_static()) {
 373       CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
 374           Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
 375       cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
 376     }
 377     return cg;
 378   }
 379 }
 380 
 381 // Return true for methods that shouldn't be inlined early so that
 382 // they are easier to analyze and optimize as intrinsics.
 383 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
 384   if (has_stringbuilder()) {
 385 
 386     if ((call_method->holder() == C->env()->StringBuilder_klass() ||
 387          call_method->holder() == C->env()->StringBuffer_klass()) &&
 388         (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
 389          jvms->method()->holder() == C->env()->StringBuffer_klass())) {
 390       // Delay SB calls only when called from non-SB code
 391       return false;
 392     }
 393 
 394     switch (call_method->intrinsic_id()) {
 395       case vmIntrinsics::_StringBuilder_void:
 396       case vmIntrinsics::_StringBuilder_int:
 397       case vmIntrinsics::_StringBuilder_String:
 398       case vmIntrinsics::_StringBuilder_append_char:
 399       case vmIntrinsics::_StringBuilder_append_int:
 400       case vmIntrinsics::_StringBuilder_append_String:
 401       case vmIntrinsics::_StringBuilder_toString:
 402       case vmIntrinsics::_StringBuffer_void:
 403       case vmIntrinsics::_StringBuffer_int:
 404       case vmIntrinsics::_StringBuffer_String:
 405       case vmIntrinsics::_StringBuffer_append_char:
 406       case vmIntrinsics::_StringBuffer_append_int:
 407       case vmIntrinsics::_StringBuffer_append_String:
 408       case vmIntrinsics::_StringBuffer_toString:
 409       case vmIntrinsics::_Integer_toString:
 410         return true;
 411 
 412       case vmIntrinsics::_String_String:
 413         {
 414           Node* receiver = jvms->map()->in(jvms->argoff() + 1);
 415           if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
 416             CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
 417             ciMethod* m = csj->method();
 418             if (m != NULL &&
 419                 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
 420                  m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
 421               // Delay String.<init>(new SB())
 422               return true;
 423           }
 424           return false;
 425         }
 426 
 427       default:
 428         return false;
 429     }
 430   }
 431   return false;
 432 }
 433 
 434 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
 435   if (eliminate_boxing() && call_method->is_boxing_method()) {
 436     set_has_boxed_value(true);
 437     return aggressive_unboxing();
 438   }
 439   return false;
 440 }
 441 
 442 bool Compile::should_delay_vector_inlining(ciMethod* call_method, JVMState* jvms) {
 443   return EnableVectorSupport && call_method->is_vector_method();
 444 }
 445 
 446 bool Compile::should_delay_vector_reboxing_inlining(ciMethod* call_method, JVMState* jvms) {
 447   return EnableVectorSupport && (call_method->intrinsic_id() == vmIntrinsics::_VectorRebox);
 448 }
 449 
 450 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
 451 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
 452   // Additional inputs to consider...
 453   // bc      = bc()
 454   // caller  = method()
 455   // iter().get_method_holder_index()
 456   assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
 457   // Interface classes can be loaded & linked and never get around to
 458   // being initialized.  Uncommon-trap for not-initialized static or
 459   // v-calls.  Let interface calls happen.
 460   ciInstanceKlass* holder_klass = dest_method->holder();
 461   if (!holder_klass->is_being_initialized() &&
 462       !holder_klass->is_initialized() &&
 463       !holder_klass->is_interface()) {
 464     uncommon_trap(Deoptimization::Reason_uninitialized,
 465                   Deoptimization::Action_reinterpret,
 466                   holder_klass);
 467     return true;
 468   }
 469 
 470   assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
 471   return false;
 472 }
 473 
 474 #ifdef ASSERT
 475 static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) {
 476   ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
 477   ciMethod* resolved_method = cg->method();
 478   if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) {
 479     tty->print_cr("JVMS:");
 480     jvms->dump();
 481     tty->print_cr("Bytecode info:");
 482     jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr();
 483     tty->print_cr("Resolved method:");
 484     cg->method()->print(); tty->cr();
 485     return false;
 486   }
 487   return true;
 488 }
 489 #endif // ASSERT
 490 
 491 //------------------------------do_call----------------------------------------
 492 // Handle your basic call.  Inline if we can & want to, else just setup call.
 493 void Parse::do_call() {
 494   // It's likely we are going to add debug info soon.
 495   // Also, if we inline a guy who eventually needs debug info for this JVMS,
 496   // our contribution to it is cleaned up right here.
 497   kill_dead_locals();
 498 
 499   C->print_inlining_assert_ready();
 500 
 501   // Set frequently used booleans
 502   const bool is_virtual = bc() == Bytecodes::_invokevirtual;
 503   const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
 504   const bool has_receiver = Bytecodes::has_receiver(bc());
 505 
 506   // Find target being called
 507   bool             will_link;
 508   ciSignature*     declared_signature = NULL;
 509   ciMethod*        orig_callee  = iter().get_method(will_link, &declared_signature);  // callee in the bytecode
 510   ciInstanceKlass* holder_klass = orig_callee->holder();
 511   ciKlass*         holder       = iter().get_declared_method_holder();
 512   ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
 513   assert(declared_signature != NULL, "cannot be null");
 514 
 515   // Bump max node limit for JSR292 users
 516   if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
 517     C->set_max_node_limit(3*MaxNodeLimit);
 518   }
 519 
 520   // uncommon-trap when callee is unloaded, uninitialized or will not link
 521   // bailout when too many arguments for register representation
 522   if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
 523     if (PrintOpto && (Verbose || WizardMode)) {
 524       method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
 525       orig_callee->print_name(); tty->cr();
 526     }
 527     return;
 528   }
 529   assert(holder_klass->is_loaded(), "");
 530   //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc");  // XXX invokehandle (cur_bc_raw)
 531   // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
 532   // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
 533   assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
 534   // Note:  In the absence of miranda methods, an abstract class K can perform
 535   // an invokevirtual directly on an interface method I.m if K implements I.
 536 
 537   // orig_callee is the resolved callee which's signature includes the
 538   // appendix argument.
 539   const int nargs = orig_callee->arg_size();
 540   const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
 541 
 542   // Push appendix argument (MethodType, CallSite, etc.), if one.
 543   if (iter().has_appendix()) {
 544     ciObject* appendix_arg = iter().get_appendix();
 545     const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg, /* require_const= */ true);
 546     Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
 547     push(appendix_arg_node);
 548   }
 549 
 550   // ---------------------
 551   // Does Class Hierarchy Analysis reveal only a single target of a v-call?
 552   // Then we may inline or make a static call, but become dependent on there being only 1 target.
 553   // Does the call-site type profile reveal only one receiver?
 554   // Then we may introduce a run-time check and inline on the path where it succeeds.
 555   // The other path may uncommon_trap, check for another receiver, or do a v-call.
 556 
 557   // Try to get the most accurate receiver type
 558   ciMethod* callee             = orig_callee;
 559   int       vtable_index       = Method::invalid_vtable_index;
 560   bool      call_does_dispatch = false;
 561 
 562   // Speculative type of the receiver if any
 563   ciKlass* speculative_receiver_type = NULL;
 564   if (is_virtual_or_interface) {
 565     Node* receiver_node             = stack(sp() - nargs);
 566     const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
 567     // call_does_dispatch and vtable_index are out-parameters.  They might be changed.
 568     // For arrays, klass below is Object. When vtable calls are used,
 569     // resolving the call with Object would allow an illegal call to
 570     // finalize() on an array. We use holder instead: illegal calls to
 571     // finalize() won't be compiled as vtable calls (IC call
 572     // resolution will catch the illegal call) and the few legal calls
 573     // on array types won't be either.
 574     callee = C->optimize_virtual_call(method(), klass, holder, orig_callee,
 575                                       receiver_type, is_virtual,
 576                                       call_does_dispatch, vtable_index);  // out-parameters
 577     speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
 578   }
 579 
 580   // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
 581   ciKlass* receiver_constraint = NULL;
 582   if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_initializer()) {
 583     ciInstanceKlass* calling_klass = method()->holder();
 584     ciInstanceKlass* sender_klass = calling_klass;
 585     if (sender_klass->is_interface()) {
 586       receiver_constraint = sender_klass;
 587     }
 588   } else if (iter().cur_bc_raw() == Bytecodes::_invokeinterface && orig_callee->is_private()) {
 589     assert(holder->is_interface(), "How did we get a non-interface method here!");
 590     receiver_constraint = holder;
 591   }
 592 
 593   if (receiver_constraint != NULL) {
 594     Node* receiver_node = stack(sp() - nargs);
 595     Node* cls_node = makecon(TypeKlassPtr::make(receiver_constraint));
 596     Node* bad_type_ctrl = NULL;
 597     Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
 598     if (bad_type_ctrl != NULL) {
 599       PreserveJVMState pjvms(this);
 600       set_control(bad_type_ctrl);
 601       uncommon_trap(Deoptimization::Reason_class_check,
 602                     Deoptimization::Action_none);
 603     }
 604     if (stopped()) {
 605       return; // MUST uncommon-trap?
 606     }
 607     set_stack(sp() - nargs, casted_receiver);
 608   }
 609 
 610   // Note:  It's OK to try to inline a virtual call.
 611   // The call generator will not attempt to inline a polymorphic call
 612   // unless it knows how to optimize the receiver dispatch.
 613   bool try_inline = (C->do_inlining() || InlineAccessors);
 614 
 615   // ---------------------
 616   dec_sp(nargs);              // Temporarily pop args for JVM state of call
 617   JVMState* jvms = sync_jvms();
 618 
 619   // ---------------------
 620   // Decide call tactic.
 621   // This call checks with CHA, the interpreter profile, intrinsics table, etc.
 622   // It decides whether inlining is desirable or not.
 623   CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
 624 
 625   // NOTE:  Don't use orig_callee and callee after this point!  Use cg->method() instead.
 626   orig_callee = callee = NULL;
 627 
 628   // ---------------------
 629   // Round double arguments before call
 630   round_double_arguments(cg->method());
 631 
 632   // Feed profiling data for arguments to the type system so it can
 633   // propagate it as speculative types
 634   record_profiled_arguments_for_speculation(cg->method(), bc());
 635 
 636 #ifndef PRODUCT
 637   // bump global counters for calls
 638   count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
 639 
 640   // Record first part of parsing work for this call
 641   parse_histogram()->record_change();
 642 #endif // not PRODUCT
 643 
 644   assert(jvms == this->jvms(), "still operating on the right JVMS");
 645   assert(jvms_in_sync(),       "jvms must carry full info into CG");
 646 
 647   // save across call, for a subsequent cast_not_null.
 648   Node* receiver = has_receiver ? argument(0) : NULL;
 649 
 650   // The extra CheckCastPPs for speculative types mess with PhaseStringOpts
 651   if (receiver != NULL && !call_does_dispatch && !cg->is_string_late_inline()) {
 652     // Feed profiling data for a single receiver to the type system so
 653     // it can propagate it as a speculative type
 654     receiver = record_profiled_receiver_for_speculation(receiver);
 655   }
 656 
 657   JVMState* new_jvms = cg->generate(jvms);
 658   if (new_jvms == NULL) {
 659     // When inlining attempt fails (e.g., too many arguments),
 660     // it may contaminate the current compile state, making it
 661     // impossible to pull back and try again.  Once we call
 662     // cg->generate(), we are committed.  If it fails, the whole
 663     // compilation task is compromised.
 664     if (failing())  return;
 665 
 666     // This can happen if a library intrinsic is available, but refuses
 667     // the call site, perhaps because it did not match a pattern the
 668     // intrinsic was expecting to optimize. Should always be possible to
 669     // get a normal java call that may inline in that case
 670     cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
 671     new_jvms = cg->generate(jvms);
 672     if (new_jvms == NULL) {
 673       guarantee(failing(), "call failed to generate:  calls should work");
 674       return;
 675     }
 676   }
 677 
 678   if (cg->is_inline()) {
 679     // Accumulate has_loops estimate
 680     C->env()->notice_inlined_method(cg->method());
 681   }
 682 
 683   // Reset parser state from [new_]jvms, which now carries results of the call.
 684   // Return value (if any) is already pushed on the stack by the cg.
 685   add_exception_states_from(new_jvms);
 686   if (new_jvms->map()->control() == top()) {
 687     stop_and_kill_map();
 688   } else {
 689     assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
 690     set_jvms(new_jvms);
 691   }
 692 
 693   assert(check_call_consistency(jvms, cg), "inconsistent info");
 694 
 695   if (!stopped()) {
 696     // This was some sort of virtual call, which did a null check for us.
 697     // Now we can assert receiver-not-null, on the normal return path.
 698     if (receiver != NULL && cg->is_virtual()) {
 699       Node* cast = cast_not_null(receiver);
 700       // %%% assert(receiver == cast, "should already have cast the receiver");
 701     }
 702 
 703     ciType* rtype = cg->method()->return_type();
 704     ciType* ctype = declared_signature->return_type();
 705 
 706     if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
 707       // Be careful here with return types.
 708       if (ctype != rtype) {
 709         BasicType rt = rtype->basic_type();
 710         BasicType ct = ctype->basic_type();
 711         if (ct == T_VOID) {
 712           // It's OK for a method  to return a value that is discarded.
 713           // The discarding does not require any special action from the caller.
 714           // The Java code knows this, at VerifyType.isNullConversion.
 715           pop_node(rt);  // whatever it was, pop it
 716         } else if (rt == T_INT || is_subword_type(rt)) {
 717           // Nothing.  These cases are handled in lambda form bytecode.
 718           assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
 719         } else if (is_reference_type(rt)) {
 720           assert(is_reference_type(ct), "rt=%s, ct=%s", type2name(rt), type2name(ct));
 721           if (ctype->is_loaded()) {
 722             const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
 723             const Type*       sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
 724             if (arg_type != NULL && !arg_type->higher_equal(sig_type)) {
 725               Node* retnode = pop();
 726               Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
 727               push(cast_obj);
 728             }
 729           }
 730         } else {
 731           assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
 732           // push a zero; it's better than getting an oop/int mismatch
 733           pop_node(rt);
 734           Node* retnode = zerocon(ct);
 735           push_node(ct, retnode);
 736         }
 737         // Now that the value is well-behaved, continue with the call-site type.
 738         rtype = ctype;
 739       }
 740     } else {
 741       // Symbolic resolution enforces the types to be the same.
 742       // NOTE: We must relax the assert for unloaded types because two
 743       // different ciType instances of the same unloaded class type
 744       // can appear to be "loaded" by different loaders (depending on
 745       // the accessing class).
 746       assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
 747              "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
 748     }
 749 
 750     // If the return type of the method is not loaded, assert that the
 751     // value we got is a null.  Otherwise, we need to recompile.
 752     if (!rtype->is_loaded()) {
 753       if (PrintOpto && (Verbose || WizardMode)) {
 754         method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
 755         cg->method()->print_name(); tty->cr();
 756       }
 757       if (C->log() != NULL) {
 758         C->log()->elem("assert_null reason='return' klass='%d'",
 759                        C->log()->identify(rtype));
 760       }
 761       // If there is going to be a trap, put it at the next bytecode:
 762       set_bci(iter().next_bci());
 763       null_assert(peek());
 764       set_bci(iter().cur_bci()); // put it back
 765     }
 766     BasicType ct = ctype->basic_type();
 767     if (is_reference_type(ct)) {
 768       record_profiled_return_for_speculation();
 769     }
 770   }
 771 
 772   // Restart record of parsing work after possible inlining of call
 773 #ifndef PRODUCT
 774   parse_histogram()->set_initial_state(bc());
 775 #endif
 776 }
 777 
 778 //---------------------------catch_call_exceptions-----------------------------
 779 // Put a Catch and CatchProj nodes behind a just-created call.
 780 // Send their caught exceptions to the proper handler.
 781 // This may be used after a call to the rethrow VM stub,
 782 // when it is needed to process unloaded exception classes.
 783 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
 784   // Exceptions are delivered through this channel:
 785   Node* i_o = this->i_o();
 786 
 787   // Add a CatchNode.
 788   GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
 789   GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
 790   GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
 791 
 792   bool default_handler = false;
 793   for (; !handlers.is_done(); handlers.next()) {
 794     ciExceptionHandler* h        = handlers.handler();
 795     int                 h_bci    = h->handler_bci();
 796     ciInstanceKlass*    h_klass  = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
 797     // Do not introduce unloaded exception types into the graph:
 798     if (!h_klass->is_loaded()) {
 799       if (saw_unloaded->contains(h_bci)) {
 800         /* We've already seen an unloaded exception with h_bci,
 801            so don't duplicate. Duplication will cause the CatchNode to be
 802            unnecessarily large. See 4713716. */
 803         continue;
 804       } else {
 805         saw_unloaded->append(h_bci);
 806       }
 807     }
 808     const Type*         h_extype = TypeOopPtr::make_from_klass(h_klass);
 809     // (We use make_from_klass because it respects UseUniqueSubclasses.)
 810     h_extype = h_extype->join(TypeInstPtr::NOTNULL);
 811     assert(!h_extype->empty(), "sanity");
 812     // Note:  It's OK if the BCIs repeat themselves.
 813     bcis->append(h_bci);
 814     extypes->append(h_extype);
 815     if (h_bci == -1) {
 816       default_handler = true;
 817     }
 818   }
 819 
 820   if (!default_handler) {
 821     bcis->append(-1);
 822     extypes->append(TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr());
 823   }
 824 
 825   int len = bcis->length();
 826   CatchNode *cn = new CatchNode(control(), i_o, len+1);
 827   Node *catch_ = _gvn.transform(cn);
 828 
 829   // now branch with the exception state to each of the (potential)
 830   // handlers
 831   for(int i=0; i < len; i++) {
 832     // Setup JVM state to enter the handler.
 833     PreserveJVMState pjvms(this);
 834     // Locals are just copied from before the call.
 835     // Get control from the CatchNode.
 836     int handler_bci = bcis->at(i);
 837     Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci));
 838     // This handler cannot happen?
 839     if (ctrl == top())  continue;
 840     set_control(ctrl);
 841 
 842     // Create exception oop
 843     const TypeInstPtr* extype = extypes->at(i)->is_instptr();
 844     Node *ex_oop = _gvn.transform(new CreateExNode(extypes->at(i), ctrl, i_o));
 845 
 846     // Handle unloaded exception classes.
 847     if (saw_unloaded->contains(handler_bci)) {
 848       // An unloaded exception type is coming here.  Do an uncommon trap.
 849 #ifndef PRODUCT
 850       // We do not expect the same handler bci to take both cold unloaded
 851       // and hot loaded exceptions.  But, watch for it.
 852       if ((Verbose || WizardMode) && extype->is_loaded()) {
 853         tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
 854         method()->print_name(); tty->cr();
 855       } else if (PrintOpto && (Verbose || WizardMode)) {
 856         tty->print("Bailing out on unloaded exception type ");
 857         extype->klass()->print_name();
 858         tty->print(" at bci:%d in ", bci());
 859         method()->print_name(); tty->cr();
 860       }
 861 #endif
 862       // Emit an uncommon trap instead of processing the block.
 863       set_bci(handler_bci);
 864       push_ex_oop(ex_oop);
 865       uncommon_trap(Deoptimization::Reason_unloaded,
 866                     Deoptimization::Action_reinterpret,
 867                     extype->klass(), "!loaded exception");
 868       set_bci(iter().cur_bci()); // put it back
 869       continue;
 870     }
 871 
 872     // go to the exception handler
 873     if (handler_bci < 0) {     // merge with corresponding rethrow node
 874       throw_to_exit(make_exception_state(ex_oop));
 875     } else {                      // Else jump to corresponding handle
 876       push_ex_oop(ex_oop);        // Clear stack and push just the oop.
 877       merge_exception(handler_bci);
 878     }
 879   }
 880 
 881   // The first CatchProj is for the normal return.
 882   // (Note:  If this is a call to rethrow_Java, this node goes dead.)
 883   set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
 884 }
 885 
 886 
 887 //----------------------------catch_inline_exceptions--------------------------
 888 // Handle all exceptions thrown by an inlined method or individual bytecode.
 889 // Common case 1: we have no handler, so all exceptions merge right into
 890 // the rethrow case.
 891 // Case 2: we have some handlers, with loaded exception klasses that have
 892 // no subklasses.  We do a Deutsch-Shiffman style type-check on the incoming
 893 // exception oop and branch to the handler directly.
 894 // Case 3: We have some handlers with subklasses or are not loaded at
 895 // compile-time.  We have to call the runtime to resolve the exception.
 896 // So we insert a RethrowCall and all the logic that goes with it.
 897 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
 898   // Caller is responsible for saving away the map for normal control flow!
 899   assert(stopped(), "call set_map(NULL) first");
 900   assert(method()->has_exception_handlers(), "don't come here w/o work to do");
 901 
 902   Node* ex_node = saved_ex_oop(ex_map);
 903   if (ex_node == top()) {
 904     // No action needed.
 905     return;
 906   }
 907   const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
 908   NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
 909   if (ex_type == NULL)
 910     ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
 911 
 912   // determine potential exception handlers
 913   ciExceptionHandlerStream handlers(method(), bci(),
 914                                     ex_type->klass()->as_instance_klass(),
 915                                     ex_type->klass_is_exact());
 916 
 917   // Start executing from the given throw state.  (Keep its stack, for now.)
 918   // Get the exception oop as known at compile time.
 919   ex_node = use_exception_state(ex_map);
 920 
 921   // Get the exception oop klass from its header
 922   Node* ex_klass_node = NULL;
 923   if (has_ex_handler() && !ex_type->klass_is_exact()) {
 924     Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
 925     ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
 926 
 927     // Compute the exception klass a little more cleverly.
 928     // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
 929     // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
 930     // each arm of the Phi.  If I know something clever about the exceptions
 931     // I'm loading the class from, I can replace the LoadKlass with the
 932     // klass constant for the exception oop.
 933     if (ex_node->is_Phi()) {
 934       ex_klass_node = new PhiNode(ex_node->in(0), TypeInstKlassPtr::OBJECT);
 935       for (uint i = 1; i < ex_node->req(); i++) {
 936         Node* ex_in = ex_node->in(i);
 937         if (ex_in == top() || ex_in == NULL) {
 938           // This path was not taken.
 939           ex_klass_node->init_req(i, top());
 940           continue;
 941         }
 942         Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
 943         Node* k = _gvn.transform( LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
 944         ex_klass_node->init_req( i, k );
 945       }
 946       _gvn.set_type(ex_klass_node, TypeInstKlassPtr::OBJECT);
 947 
 948     }
 949   }
 950 
 951   // Scan the exception table for applicable handlers.
 952   // If none, we can call rethrow() and be done!
 953   // If precise (loaded with no subklasses), insert a D.S. style
 954   // pointer compare to the correct handler and loop back.
 955   // If imprecise, switch to the Rethrow VM-call style handling.
 956 
 957   int remaining = handlers.count_remaining();
 958 
 959   // iterate through all entries sequentially
 960   for (;!handlers.is_done(); handlers.next()) {
 961     ciExceptionHandler* handler = handlers.handler();
 962 
 963     if (handler->is_rethrow()) {
 964       // If we fell off the end of the table without finding an imprecise
 965       // exception klass (and without finding a generic handler) then we
 966       // know this exception is not handled in this method.  We just rethrow
 967       // the exception into the caller.
 968       throw_to_exit(make_exception_state(ex_node));
 969       return;
 970     }
 971 
 972     // exception handler bci range covers throw_bci => investigate further
 973     int handler_bci = handler->handler_bci();
 974 
 975     if (remaining == 1) {
 976       push_ex_oop(ex_node);        // Push exception oop for handler
 977       if (PrintOpto && WizardMode) {
 978         tty->print_cr("  Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
 979       }
 980       merge_exception(handler_bci); // jump to handler
 981       return;                   // No more handling to be done here!
 982     }
 983 
 984     // Get the handler's klass
 985     ciInstanceKlass* klass = handler->catch_klass();
 986 
 987     if (!klass->is_loaded()) {  // klass is not loaded?
 988       // fall through into catch_call_exceptions which will emit a
 989       // handler with an uncommon trap.
 990       break;
 991     }
 992 
 993     if (klass->is_interface())  // should not happen, but...
 994       break;                    // bail out
 995 
 996     // Check the type of the exception against the catch type
 997     const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
 998     Node* con = _gvn.makecon(tk);
 999     Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
1000     if (!stopped()) {
1001       PreserveJVMState pjvms(this);
1002       const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
1003       assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
1004       Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
1005       push_ex_oop(ex_oop);      // Push exception oop for handler
1006       if (PrintOpto && WizardMode) {
1007         tty->print("  Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
1008         klass->print_name();
1009         tty->cr();
1010       }
1011       merge_exception(handler_bci);
1012     }
1013     set_control(not_subtype_ctrl);
1014 
1015     // Come here if exception does not match handler.
1016     // Carry on with more handler checks.
1017     --remaining;
1018   }
1019 
1020   assert(!stopped(), "you should return if you finish the chain");
1021 
1022   // Oops, need to call into the VM to resolve the klasses at runtime.
1023   // Note:  This call must not deoptimize, since it is not a real at this bci!
1024   kill_dead_locals();
1025 
1026   make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
1027                     OptoRuntime::rethrow_Type(),
1028                     OptoRuntime::rethrow_stub(),
1029                     NULL, NULL,
1030                     ex_node);
1031 
1032   // Rethrow is a pure call, no side effects, only a result.
1033   // The result cannot be allocated, so we use I_O
1034 
1035   // Catch exceptions from the rethrow
1036   catch_call_exceptions(handlers);
1037 }
1038 
1039 
1040 // (Note:  Moved add_debug_info into GraphKit::add_safepoint_edges.)
1041 
1042 
1043 #ifndef PRODUCT
1044 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
1045   if( CountCompiledCalls ) {
1046     if( at_method_entry ) {
1047       // bump invocation counter if top method (for statistics)
1048       if (CountCompiledCalls && depth() == 1) {
1049         const TypePtr* addr_type = TypeMetadataPtr::make(method());
1050         Node* adr1 = makecon(addr_type);
1051         Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
1052         increment_counter(adr2);
1053       }
1054     } else if (is_inline) {
1055       switch (bc()) {
1056       case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
1057       case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
1058       case Bytecodes::_invokestatic:
1059       case Bytecodes::_invokedynamic:
1060       case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
1061       default: fatal("unexpected call bytecode");
1062       }
1063     } else {
1064       switch (bc()) {
1065       case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
1066       case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
1067       case Bytecodes::_invokestatic:
1068       case Bytecodes::_invokedynamic:
1069       case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_static_calls_addr()); break;
1070       default: fatal("unexpected call bytecode");
1071       }
1072     }
1073   }
1074 }
1075 #endif //PRODUCT
1076 
1077 
1078 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, ciInstanceKlass* klass,
1079                                          ciKlass* holder, ciMethod* callee,
1080                                          const TypeOopPtr* receiver_type, bool is_virtual,
1081                                          bool& call_does_dispatch, int& vtable_index,
1082                                          bool check_access) {
1083   // Set default values for out-parameters.
1084   call_does_dispatch = true;
1085   vtable_index       = Method::invalid_vtable_index;
1086 
1087   // Choose call strategy.
1088   ciMethod* optimized_virtual_method = optimize_inlining(caller, klass, holder, callee,
1089                                                          receiver_type, check_access);
1090 
1091   // Have the call been sufficiently improved such that it is no longer a virtual?
1092   if (optimized_virtual_method != NULL) {
1093     callee             = optimized_virtual_method;
1094     call_does_dispatch = false;
1095   } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1096     // We can make a vtable call at this site
1097     vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1098   }
1099   return callee;
1100 }
1101 
1102 // Identify possible target method and inlining style
1103 ciMethod* Compile::optimize_inlining(ciMethod* caller, ciInstanceKlass* klass, ciKlass* holder,
1104                                      ciMethod* callee, const TypeOopPtr* receiver_type,
1105                                      bool check_access) {
1106   // only use for virtual or interface calls
1107 
1108   // If it is obviously final, do not bother to call find_monomorphic_target,
1109   // because the class hierarchy checks are not needed, and may fail due to
1110   // incompletely loaded classes.  Since we do our own class loading checks
1111   // in this module, we may confidently bind to any method.
1112   if (callee->can_be_statically_bound()) {
1113     return callee;
1114   }
1115 
1116   if (receiver_type == NULL) {
1117     return NULL; // no receiver type info
1118   }
1119 
1120   // Attempt to improve the receiver
1121   bool actual_receiver_is_exact = false;
1122   ciInstanceKlass* actual_receiver = klass;
1123   // Array methods are all inherited from Object, and are monomorphic.
1124   // finalize() call on array is not allowed.
1125   if (receiver_type->isa_aryptr() &&
1126       callee->holder() == env()->Object_klass() &&
1127       callee->name() != ciSymbols::finalize_method_name()) {
1128     return callee;
1129   }
1130 
1131   // All other interesting cases are instance klasses.
1132   if (!receiver_type->isa_instptr()) {
1133     return NULL;
1134   }
1135 
1136   ciInstanceKlass* receiver_klass = receiver_type->klass()->as_instance_klass();
1137   if (receiver_klass->is_loaded() && receiver_klass->is_initialized() && !receiver_klass->is_interface() &&
1138       (receiver_klass == actual_receiver || receiver_klass->is_subtype_of(actual_receiver))) {
1139     // ikl is a same or better type than the original actual_receiver,
1140     // e.g. static receiver from bytecodes.
1141     actual_receiver = receiver_klass;
1142     // Is the actual_receiver exact?
1143     actual_receiver_is_exact = receiver_type->klass_is_exact();
1144   }
1145 
1146   ciInstanceKlass*   calling_klass = caller->holder();
1147   ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1148 
1149   if (cha_monomorphic_target != NULL) {
1150     // Hardwiring a virtual.
1151     assert(!callee->can_be_statically_bound(), "should have been handled earlier");
1152     assert(!cha_monomorphic_target->is_abstract(), "");
1153     if (!cha_monomorphic_target->can_be_statically_bound(actual_receiver)) {
1154       // If we inlined because CHA revealed only a single target method,
1155       // then we are dependent on that target method not getting overridden
1156       // by dynamic class loading.  Be sure to test the "static" receiver
1157       // dest_method here, as opposed to the actual receiver, which may
1158       // falsely lead us to believe that the receiver is final or private.
1159       dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target, holder, callee);
1160     }
1161     return cha_monomorphic_target;
1162   }
1163 
1164   // If the type is exact, we can still bind the method w/o a vcall.
1165   // (This case comes after CHA so we can see how much extra work it does.)
1166   if (actual_receiver_is_exact) {
1167     // In case of evolution, there is a dependence on every inlined method, since each
1168     // such method can be changed when its class is redefined.
1169     ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1170     if (exact_method != NULL) {
1171       return exact_method;
1172     }
1173   }
1174 
1175   return NULL;
1176 }