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/inlinetypenode.hpp"
  38 #include "opto/mulnode.hpp"
  39 #include "opto/parse.hpp"
  40 #include "opto/rootnode.hpp"
  41 #include "opto/runtime.hpp"
  42 #include "opto/subnode.hpp"
  43 #include "prims/methodHandles.hpp"
  44 #include "runtime/sharedRuntime.hpp"
  45 
  46 void trace_type_profile(Compile* C, ciMethod *method, int depth, int bci, ciMethod *prof_method, ciKlass *prof_klass, int site_count, int receiver_count) {
  47   if (TraceTypeProfile || C->print_inlining()) {
  48     outputStream* out = tty;
  49     if (!C->print_inlining()) {
  50       if (!PrintOpto && !PrintCompilation) {
  51         method->print_short_name();
  52         tty->cr();
  53       }
  54       CompileTask::print_inlining_tty(prof_method, depth, bci);
  55     } else {
  56       out = C->print_inlining_stream();
  57     }
  58     CompileTask::print_inline_indent(depth, out);
  59     out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
  60     stringStream ss;
  61     prof_klass->name()->print_symbol_on(&ss);
  62     out->print("%s", ss.as_string());
  63     out->cr();
  64   }
  65 }
  66 
  67 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
  68                                        JVMState* jvms, bool allow_inline,
  69                                        float prof_factor, ciKlass* speculative_receiver_type,
  70                                        bool allow_intrinsics) {
  71   assert(callee != NULL, "failed method resolution");
  72 
  73   ciMethod*       caller      = jvms->method();
  74   int             bci         = jvms->bci();
  75   Bytecodes::Code bytecode    = caller->java_code_at_bci(bci);
  76   ciMethod*       orig_callee = caller->get_method_at_bci(bci);
  77 
  78   const bool is_virtual_or_interface = (bytecode == Bytecodes::_invokevirtual) ||
  79                                        (bytecode == Bytecodes::_invokeinterface) ||
  80                                        (orig_callee->intrinsic_id() == vmIntrinsics::_linkToVirtual) ||
  81                                        (orig_callee->intrinsic_id() == vmIntrinsics::_linkToInterface);
  82 
  83   // Dtrace currently doesn't work unless all calls are vanilla
  84   if (env()->dtrace_method_probes()) {
  85     allow_inline = false;
  86   }
  87 
  88   // Note: When we get profiling during stage-1 compiles, we want to pull
  89   // from more specific profile data which pertains to this inlining.
  90   // Right now, ignore the information in jvms->caller(), and do method[bci].
  91   ciCallProfile profile = caller->call_profile_at_bci(bci);
  92 
  93   // See how many times this site has been invoked.
  94   int site_count = profile.count();
  95   int receiver_count = -1;
  96   if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
  97     // Receivers in the profile structure are ordered by call counts
  98     // so that the most called (major) receiver is profile.receiver(0).
  99     receiver_count = profile.receiver_count(0);
 100   }
 101 
 102   CompileLog* log = this->log();
 103   if (log != NULL) {
 104     int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
 105     int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
 106     log->begin_elem("call method='%d' count='%d' prof_factor='%f'",
 107                     log->identify(callee), site_count, prof_factor);
 108     if (call_does_dispatch)  log->print(" virtual='1'");
 109     if (allow_inline)     log->print(" inline='1'");
 110     if (receiver_count >= 0) {
 111       log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
 112       if (profile.has_receiver(1)) {
 113         log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
 114       }
 115     }
 116     if (callee->is_method_handle_intrinsic()) {
 117       log->print(" method_handle_intrinsic='1'");
 118     }
 119     log->end_elem();
 120   }
 121 
 122   // Special case the handling of certain common, profitable library
 123   // methods.  If these methods are replaced with specialized code,
 124   // then we return it as the inlined version of the call.
 125   CallGenerator* cg_intrinsic = NULL;
 126   if (allow_inline && allow_intrinsics) {
 127     CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
 128     if (cg != NULL) {
 129       if (cg->is_predicated()) {
 130         // Code without intrinsic but, hopefully, inlined.
 131         CallGenerator* inline_cg = this->call_generator(callee,
 132               vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
 133         if (inline_cg != NULL) {
 134           cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg);
 135         }
 136       }
 137 
 138       // If intrinsic does the virtual dispatch, we try to use the type profile
 139       // first, and hopefully inline it as the regular virtual call below.
 140       // We will retry the intrinsic if nothing had claimed it afterwards.
 141       if (cg->does_virtual_dispatch()) {
 142         cg_intrinsic = cg;
 143         cg = NULL;
 144       } else if (IncrementalInline && should_delay_vector_inlining(callee, jvms)) {
 145         return CallGenerator::for_late_inline(callee, cg);
 146       } else {
 147         return cg;
 148       }
 149     }
 150   }
 151 
 152   // Do method handle calls.
 153   // NOTE: This must happen before normal inlining logic below since
 154   // MethodHandle.invoke* are native methods which obviously don't
 155   // have bytecodes and so normal inlining fails.
 156   if (callee->is_method_handle_intrinsic()) {
 157     CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, allow_inline);
 158     return cg;
 159   }
 160 
 161   // Attempt to inline...
 162   if (allow_inline) {
 163     // The profile data is only partly attributable to this caller,
 164     // scale back the call site information.
 165     float past_uses = jvms->method()->scale_count(site_count, prof_factor);
 166     // This is the number of times we expect the call code to be used.
 167     float expected_uses = past_uses;
 168 
 169     // Try inlining a bytecoded method:
 170     if (!call_does_dispatch) {
 171       InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
 172       bool should_delay = AlwaysIncrementalInline;
 173       if (ilt->ok_to_inline(callee, jvms, profile, should_delay)) {
 174         CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
 175         // For optimized virtual calls assert at runtime that receiver object
 176         // is a subtype of the inlined method holder. CHA can report a method
 177         // as a unique target under an abstract method, but receiver type
 178         // sometimes has a broader type. Similar scenario is possible with
 179         // default methods when type system loses information about implemented
 180         // interfaces.
 181         if (cg != NULL && is_virtual_or_interface && !callee->is_static()) {
 182           CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
 183               Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
 184 
 185           cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
 186         }
 187         if (cg != NULL) {
 188           // Delay the inlining of this method to give us the
 189           // opportunity to perform some high level optimizations
 190           // first.
 191           if (should_delay_string_inlining(callee, jvms)) {
 192             return CallGenerator::for_string_late_inline(callee, cg);
 193           } else if (should_delay_boxing_inlining(callee, jvms)) {
 194             return CallGenerator::for_boxing_late_inline(callee, cg);
 195           } else if (should_delay_vector_reboxing_inlining(callee, jvms)) {
 196             return CallGenerator::for_vector_reboxing_late_inline(callee, cg);
 197           } else if (should_delay) {
 198             return CallGenerator::for_late_inline(callee, cg);
 199           } else {
 200             return cg;
 201           }
 202         }
 203       }
 204     }
 205 
 206     // Try using the type profile.
 207     if (call_does_dispatch && site_count > 0 && UseTypeProfile) {
 208       // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
 209       bool have_major_receiver = profile.has_receiver(0) && (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
 210       ciMethod* receiver_method = NULL;
 211 
 212       int morphism = profile.morphism();
 213       if (speculative_receiver_type != NULL) {
 214         if (!too_many_traps_or_recompiles(caller, bci, Deoptimization::Reason_speculate_class_check)) {
 215           // We have a speculative type, we should be able to resolve
 216           // the call. We do that before looking at the profiling at
 217           // this invoke because it may lead to bimorphic inlining which
 218           // a speculative type should help us avoid.
 219           receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 220                                                    speculative_receiver_type);
 221           if (receiver_method == NULL) {
 222             speculative_receiver_type = NULL;
 223           } else {
 224             morphism = 1;
 225           }
 226         } else {
 227           // speculation failed before. Use profiling at the call
 228           // (could allow bimorphic inlining for instance).
 229           speculative_receiver_type = NULL;
 230         }
 231       }
 232       if (receiver_method == NULL &&
 233           (have_major_receiver || morphism == 1 ||
 234            (morphism == 2 && UseBimorphicInlining))) {
 235         // receiver_method = profile.method();
 236         // Profiles do not suggest methods now.  Look it up in the major receiver.
 237         receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 238                                                       profile.receiver(0));
 239       }
 240       if (receiver_method != NULL) {
 241         // The single majority receiver sufficiently outweighs the minority.
 242         CallGenerator* hit_cg = this->call_generator(receiver_method,
 243               vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
 244         if (hit_cg != NULL) {
 245           // Look up second receiver.
 246           CallGenerator* next_hit_cg = NULL;
 247           ciMethod* next_receiver_method = NULL;
 248           if (morphism == 2 && UseBimorphicInlining) {
 249             next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 250                                                                profile.receiver(1));
 251             if (next_receiver_method != NULL) {
 252               next_hit_cg = this->call_generator(next_receiver_method,
 253                                   vtable_index, !call_does_dispatch, jvms,
 254                                   allow_inline, prof_factor);
 255               if (next_hit_cg != NULL && !next_hit_cg->is_inline() &&
 256                   have_major_receiver && UseOnlyInlinedBimorphic) {
 257                   // Skip if we can't inline second receiver's method
 258                   next_hit_cg = NULL;
 259               }
 260             }
 261           }
 262           CallGenerator* miss_cg;
 263           Deoptimization::DeoptReason reason = (morphism == 2
 264                                                ? Deoptimization::Reason_bimorphic
 265                                                : Deoptimization::reason_class_check(speculative_receiver_type != NULL));
 266           if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
 267               !too_many_traps_or_recompiles(caller, bci, reason)
 268              ) {
 269             // Generate uncommon trap for class check failure path
 270             // in case of monomorphic or bimorphic virtual call site.
 271             miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
 272                         Deoptimization::Action_maybe_recompile);
 273           } else {
 274             // Generate virtual call for class check failure path
 275             // in case of polymorphic virtual call site.
 276             miss_cg = (IncrementalInlineVirtual ? CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor)
 277                                                 : CallGenerator::for_virtual_call(callee, vtable_index));
 278           }
 279           if (miss_cg != NULL) {
 280             if (next_hit_cg != NULL) {
 281               assert(speculative_receiver_type == NULL, "shouldn't end up here if we used speculation");
 282               trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
 283               // We don't need to record dependency on a receiver here and below.
 284               // Whenever we inline, the dependency is added by Parse::Parse().
 285               miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
 286             }
 287             if (miss_cg != NULL) {
 288               ciKlass* k = speculative_receiver_type != NULL ? speculative_receiver_type : profile.receiver(0);
 289               trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, k, site_count, receiver_count);
 290               float hit_prob = speculative_receiver_type != NULL ? 1.0 : profile.receiver_prob(0);
 291               CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
 292               if (cg != NULL)  return cg;
 293             }
 294           }
 295         }
 296       }
 297     }
 298 
 299     // If there is only one implementor of this interface then we
 300     // may be able to bind this invoke directly to the implementing
 301     // klass but we need both a dependence on the single interface
 302     // and on the method we bind to. Additionally since all we know
 303     // about the receiver type is that it's supposed to implement the
 304     // interface we have to insert a check that it's the class we
 305     // expect.  Interface types are not checked by the verifier so
 306     // they are roughly equivalent to Object.
 307     // The number of implementors for declared_interface is less or
 308     // equal to the number of implementors for target->holder() so
 309     // if number of implementors of target->holder() == 1 then
 310     // number of implementors for decl_interface is 0 or 1. If
 311     // it's 0 then no class implements decl_interface and there's
 312     // no point in inlining.
 313     if (call_does_dispatch && bytecode == Bytecodes::_invokeinterface) {
 314       ciInstanceKlass* declared_interface =
 315           caller->get_declared_method_holder_at_bci(bci)->as_instance_klass();
 316       ciInstanceKlass* singleton = declared_interface->unique_implementor();
 317 
 318       if (singleton != NULL) {
 319         assert(singleton != declared_interface, "not a unique implementor");
 320 
 321         ciMethod* cha_monomorphic_target =
 322             callee->find_monomorphic_target(caller->holder(), declared_interface, singleton);
 323 
 324         if (cha_monomorphic_target != NULL &&
 325             cha_monomorphic_target->holder() != env()->Object_klass()) { // subtype check against Object is useless
 326           ciKlass* holder = cha_monomorphic_target->holder();
 327 
 328           // Try to inline the method found by CHA. Inlined method is guarded by the type check.
 329           CallGenerator* hit_cg = call_generator(cha_monomorphic_target,
 330               vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
 331 
 332           // Deoptimize on type check fail. The interpreter will throw ICCE for us.
 333           CallGenerator* miss_cg = CallGenerator::for_uncommon_trap(callee,
 334               Deoptimization::Reason_class_check, Deoptimization::Action_none);
 335 
 336           ciKlass* constraint = (holder->is_subclass_of(singleton) ? holder : singleton); // avoid upcasts
 337           CallGenerator* cg = CallGenerator::for_guarded_call(constraint, miss_cg, hit_cg);
 338           if (hit_cg != NULL && cg != NULL) {
 339             dependencies()->assert_unique_implementor(declared_interface, singleton);
 340             dependencies()->assert_unique_concrete_method(declared_interface, cha_monomorphic_target, declared_interface, callee);
 341             return cg;
 342           }
 343         }
 344       }
 345     } // call_does_dispatch && bytecode == Bytecodes::_invokeinterface
 346 
 347     // Nothing claimed the intrinsic, we go with straight-forward inlining
 348     // for already discovered intrinsic.
 349     if (allow_intrinsics && cg_intrinsic != NULL) {
 350       assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
 351       return cg_intrinsic;
 352     }
 353   } // allow_inline
 354 
 355   // There was no special inlining tactic, or it bailed out.
 356   // Use a more generic tactic, like a simple call.
 357   if (call_does_dispatch) {
 358     const char* msg = "virtual call";
 359     if (C->print_inlining()) {
 360       print_inlining(callee, jvms->depth() - 1, jvms->bci(), msg);
 361     }
 362     C->log_inline_failure(msg);
 363     if (IncrementalInlineVirtual && allow_inline) {
 364       return CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor); // attempt to inline through virtual call later
 365     } else {
 366       return CallGenerator::for_virtual_call(callee, vtable_index);
 367     }
 368   } else {
 369     // Class Hierarchy Analysis or Type Profile reveals a unique target, or it is a static or special call.
 370     CallGenerator* cg = CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
 371     // For optimized virtual calls assert at runtime that receiver object
 372     // is a subtype of the method holder.
 373     if (cg != NULL && is_virtual_or_interface && !callee->is_static()) {
 374       CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
 375           Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
 376       cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
 377     }
 378     return cg;
 379   }
 380 }
 381 
 382 // Return true for methods that shouldn't be inlined early so that
 383 // they are easier to analyze and optimize as intrinsics.
 384 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
 385   if (has_stringbuilder()) {
 386 
 387     if ((call_method->holder() == C->env()->StringBuilder_klass() ||
 388          call_method->holder() == C->env()->StringBuffer_klass()) &&
 389         (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
 390          jvms->method()->holder() == C->env()->StringBuffer_klass())) {
 391       // Delay SB calls only when called from non-SB code
 392       return false;
 393     }
 394 
 395     switch (call_method->intrinsic_id()) {
 396       case vmIntrinsics::_StringBuilder_void:
 397       case vmIntrinsics::_StringBuilder_int:
 398       case vmIntrinsics::_StringBuilder_String:
 399       case vmIntrinsics::_StringBuilder_append_char:
 400       case vmIntrinsics::_StringBuilder_append_int:
 401       case vmIntrinsics::_StringBuilder_append_String:
 402       case vmIntrinsics::_StringBuilder_toString:
 403       case vmIntrinsics::_StringBuffer_void:
 404       case vmIntrinsics::_StringBuffer_int:
 405       case vmIntrinsics::_StringBuffer_String:
 406       case vmIntrinsics::_StringBuffer_append_char:
 407       case vmIntrinsics::_StringBuffer_append_int:
 408       case vmIntrinsics::_StringBuffer_append_String:
 409       case vmIntrinsics::_StringBuffer_toString:
 410       case vmIntrinsics::_Integer_toString:
 411         return true;
 412 
 413       case vmIntrinsics::_String_String:
 414         {
 415           Node* receiver = jvms->map()->in(jvms->argoff() + 1);
 416           if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
 417             CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
 418             ciMethod* m = csj->method();
 419             if (m != NULL &&
 420                 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
 421                  m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
 422               // Delay String.<init>(new SB())
 423               return true;
 424           }
 425           return false;
 426         }
 427 
 428       default:
 429         return false;
 430     }
 431   }
 432   return false;
 433 }
 434 
 435 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
 436   if (eliminate_boxing() && call_method->is_boxing_method()) {
 437     set_has_boxed_value(true);
 438     return aggressive_unboxing();
 439   }
 440   return false;
 441 }
 442 
 443 bool Compile::should_delay_vector_inlining(ciMethod* call_method, JVMState* jvms) {
 444   return EnableVectorSupport && call_method->is_vector_method();
 445 }
 446 
 447 bool Compile::should_delay_vector_reboxing_inlining(ciMethod* call_method, JVMState* jvms) {
 448   return EnableVectorSupport && (call_method->intrinsic_id() == vmIntrinsics::_VectorRebox);
 449 }
 450 
 451 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
 452 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
 453   // Additional inputs to consider...
 454   // bc      = bc()
 455   // caller  = method()
 456   // iter().get_method_holder_index()
 457   assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
 458   // Interface classes can be loaded & linked and never get around to
 459   // being initialized.  Uncommon-trap for not-initialized static or
 460   // v-calls.  Let interface calls happen.
 461   ciInstanceKlass* holder_klass = dest_method->holder();
 462   if (!holder_klass->is_being_initialized() &&
 463       !holder_klass->is_initialized() &&
 464       !holder_klass->is_interface()) {
 465     uncommon_trap(Deoptimization::Reason_uninitialized,
 466                   Deoptimization::Action_reinterpret,
 467                   holder_klass);
 468     return true;
 469   }
 470 
 471   assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
 472   return false;
 473 }
 474 
 475 #ifdef ASSERT
 476 static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) {
 477   ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
 478   ciMethod* resolved_method = cg->method();
 479   if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) {
 480     tty->print_cr("JVMS:");
 481     jvms->dump();
 482     tty->print_cr("Bytecode info:");
 483     jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr();
 484     tty->print_cr("Resolved method:");
 485     cg->method()->print(); tty->cr();
 486     return false;
 487   }
 488   return true;
 489 }
 490 #endif // ASSERT
 491 
 492 //------------------------------do_call----------------------------------------
 493 // Handle your basic call.  Inline if we can & want to, else just setup call.
 494 void Parse::do_call() {
 495   // It's likely we are going to add debug info soon.
 496   // Also, if we inline a guy who eventually needs debug info for this JVMS,
 497   // our contribution to it is cleaned up right here.
 498   kill_dead_locals();
 499 
 500   C->print_inlining_assert_ready();
 501 
 502   // Set frequently used booleans
 503   const bool is_virtual = bc() == Bytecodes::_invokevirtual;
 504   const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
 505   const bool has_receiver = Bytecodes::has_receiver(bc());
 506 
 507   // Find target being called
 508   bool             will_link;
 509   ciSignature*     declared_signature = NULL;
 510   ciMethod*        orig_callee  = iter().get_method(will_link, &declared_signature);  // callee in the bytecode
 511   ciInstanceKlass* holder_klass = orig_callee->holder();
 512   ciKlass*         holder       = iter().get_declared_method_holder();
 513   ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
 514   assert(declared_signature != NULL, "cannot be null");
 515 
 516   // Bump max node limit for JSR292 users
 517   if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
 518     C->set_max_node_limit(3*MaxNodeLimit);
 519   }
 520 
 521   // uncommon-trap when callee is unloaded, uninitialized or will not link
 522   // bailout when too many arguments for register representation
 523   if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
 524     if (PrintOpto && (Verbose || WizardMode)) {
 525       method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
 526       orig_callee->print_name(); tty->cr();
 527     }
 528     return;
 529   }
 530   assert(holder_klass->is_loaded(), "");
 531   //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc");  // XXX invokehandle (cur_bc_raw)
 532   // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
 533   // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
 534   assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
 535   // Note:  In the absence of miranda methods, an abstract class K can perform
 536   // an invokevirtual directly on an interface method I.m if K implements I.
 537 
 538   // orig_callee is the resolved callee which's signature includes the
 539   // appendix argument.
 540   const int nargs = orig_callee->arg_size();
 541   const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
 542 
 543   // Push appendix argument (MethodType, CallSite, etc.), if one.
 544   if (iter().has_appendix()) {
 545     ciObject* appendix_arg = iter().get_appendix();
 546     const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg, /* require_const= */ true);
 547     Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
 548     push(appendix_arg_node);
 549   }
 550 
 551   // ---------------------
 552   // Does Class Hierarchy Analysis reveal only a single target of a v-call?
 553   // Then we may inline or make a static call, but become dependent on there being only 1 target.
 554   // Does the call-site type profile reveal only one receiver?
 555   // Then we may introduce a run-time check and inline on the path where it succeeds.
 556   // The other path may uncommon_trap, check for another receiver, or do a v-call.
 557 
 558   // Try to get the most accurate receiver type
 559   ciMethod* callee             = orig_callee;
 560   int       vtable_index       = Method::invalid_vtable_index;
 561   bool      call_does_dispatch = false;
 562 
 563   // Speculative type of the receiver if any
 564   ciKlass* speculative_receiver_type = NULL;
 565   if (is_virtual_or_interface) {
 566     Node* receiver_node             = stack(sp() - nargs);
 567     const TypeOopPtr* receiver_type = NULL;
 568     if (receiver_node->is_InlineType()) {
 569       receiver_type = TypeInstPtr::make(TypePtr::NotNull, _gvn.type(receiver_node)->inline_klass());
 570     } else {
 571       receiver_type = _gvn.type(receiver_node)->isa_oopptr();
 572     }
 573     // call_does_dispatch and vtable_index are out-parameters.  They might be changed.
 574     // For arrays, klass below is Object. When vtable calls are used,
 575     // resolving the call with Object would allow an illegal call to
 576     // finalize() on an array. We use holder instead: illegal calls to
 577     // finalize() won't be compiled as vtable calls (IC call
 578     // resolution will catch the illegal call) and the few legal calls
 579     // on array types won't be either.
 580     callee = C->optimize_virtual_call(method(), klass, holder, orig_callee,
 581                                       receiver_type, is_virtual,
 582                                       call_does_dispatch, vtable_index);  // out-parameters
 583     speculative_receiver_type = receiver_type != NULL ? receiver_type->speculative_type() : NULL;
 584   }
 585 
 586   // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
 587   ciKlass* receiver_constraint = NULL;
 588   if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_constructor()) {
 589     ciInstanceKlass* calling_klass = method()->holder();
 590     ciInstanceKlass* sender_klass = calling_klass;
 591     if (sender_klass->is_interface()) {
 592       receiver_constraint = sender_klass;
 593     }
 594   } else if (iter().cur_bc_raw() == Bytecodes::_invokeinterface && orig_callee->is_private()) {
 595     assert(holder->is_interface(), "How did we get a non-interface method here!");
 596     receiver_constraint = holder;
 597   }
 598 
 599   if (receiver_constraint != NULL) {
 600     Node* receiver_node = stack(sp() - nargs);
 601     Node* cls_node = makecon(TypeKlassPtr::make(receiver_constraint));
 602     Node* bad_type_ctrl = NULL;
 603     Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
 604     if (bad_type_ctrl != NULL) {
 605       PreserveJVMState pjvms(this);
 606       set_control(bad_type_ctrl);
 607       uncommon_trap(Deoptimization::Reason_class_check,
 608                     Deoptimization::Action_none);
 609     }
 610     if (stopped()) {
 611       return; // MUST uncommon-trap?
 612     }
 613     set_stack(sp() - nargs, casted_receiver);
 614   }
 615 
 616   // Note:  It's OK to try to inline a virtual call.
 617   // The call generator will not attempt to inline a polymorphic call
 618   // unless it knows how to optimize the receiver dispatch.
 619   bool try_inline = (C->do_inlining() || InlineAccessors);
 620 
 621   // ---------------------
 622   dec_sp(nargs);              // Temporarily pop args for JVM state of call
 623   JVMState* jvms = sync_jvms();
 624 
 625   // ---------------------
 626   // Decide call tactic.
 627   // This call checks with CHA, the interpreter profile, intrinsics table, etc.
 628   // It decides whether inlining is desirable or not.
 629   CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
 630 
 631   // NOTE:  Don't use orig_callee and callee after this point!  Use cg->method() instead.
 632   orig_callee = callee = NULL;
 633 
 634   // ---------------------
 635   // Round double arguments before call
 636   round_double_arguments(cg->method());
 637 
 638   // Feed profiling data for arguments to the type system so it can
 639   // propagate it as speculative types
 640   record_profiled_arguments_for_speculation(cg->method(), bc());
 641 
 642 #ifndef PRODUCT
 643   // bump global counters for calls
 644   count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
 645 
 646   // Record first part of parsing work for this call
 647   parse_histogram()->record_change();
 648 #endif // not PRODUCT
 649 
 650   assert(jvms == this->jvms(), "still operating on the right JVMS");
 651   assert(jvms_in_sync(),       "jvms must carry full info into CG");
 652 
 653   // save across call, for a subsequent cast_not_null.
 654   Node* receiver = has_receiver ? argument(0) : NULL;
 655 
 656   // The extra CheckCastPPs for speculative types mess with PhaseStringOpts
 657   if (receiver != NULL && !receiver->is_InlineType() && !call_does_dispatch && !cg->is_string_late_inline()) {
 658     // Feed profiling data for a single receiver to the type system so
 659     // it can propagate it as a speculative type
 660     receiver = record_profiled_receiver_for_speculation(receiver);
 661   }
 662 
 663   JVMState* new_jvms = cg->generate(jvms);
 664   if (new_jvms == NULL) {
 665     // When inlining attempt fails (e.g., too many arguments),
 666     // it may contaminate the current compile state, making it
 667     // impossible to pull back and try again.  Once we call
 668     // cg->generate(), we are committed.  If it fails, the whole
 669     // compilation task is compromised.
 670     if (failing())  return;
 671 
 672     // This can happen if a library intrinsic is available, but refuses
 673     // the call site, perhaps because it did not match a pattern the
 674     // intrinsic was expecting to optimize. Should always be possible to
 675     // get a normal java call that may inline in that case
 676     cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
 677     new_jvms = cg->generate(jvms);
 678     if (new_jvms == NULL) {
 679       guarantee(failing(), "call failed to generate:  calls should work");
 680       return;
 681     }
 682   }
 683 
 684   if (cg->is_inline()) {
 685     // Accumulate has_loops estimate
 686     C->env()->notice_inlined_method(cg->method());
 687   }
 688 
 689   // Reset parser state from [new_]jvms, which now carries results of the call.
 690   // Return value (if any) is already pushed on the stack by the cg.
 691   add_exception_states_from(new_jvms);
 692   if (new_jvms->map()->control() == top()) {
 693     stop_and_kill_map();
 694   } else {
 695     assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
 696     set_jvms(new_jvms);
 697   }
 698 
 699   assert(check_call_consistency(jvms, cg), "inconsistent info");
 700 
 701   if (!stopped()) {
 702     // This was some sort of virtual call, which did a null check for us.
 703     // Now we can assert receiver-not-null, on the normal return path.
 704     if (receiver != NULL && cg->is_virtual()) {
 705       Node* cast = cast_not_null(receiver);
 706       // %%% assert(receiver == cast, "should already have cast the receiver");
 707     }
 708 
 709     ciType* rtype = cg->method()->return_type();
 710     ciType* ctype = declared_signature->return_type();
 711 
 712     if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
 713       // Be careful here with return types.
 714       if (ctype != rtype) {
 715         BasicType rt = rtype->basic_type();
 716         BasicType ct = ctype->basic_type();
 717         if (ct == T_VOID) {
 718           // It's OK for a method to return a value that is discarded.
 719           // The discarding does not require any special action from the caller.
 720           // The Java code knows this, at VerifyType.isNullConversion.
 721           pop_node(rt);  // whatever it was, pop it
 722         } else if (rt == T_INT || is_subword_type(rt)) {
 723           // Nothing.  These cases are handled in lambda form bytecode.
 724           assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
 725         } else if (is_reference_type(rt)) {
 726           assert(is_reference_type(ct), "rt=%s, ct=%s", type2name(rt), type2name(ct));
 727           if (ctype->is_loaded()) {
 728             const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
 729             const Type*       sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
 730             if (declared_signature->returns_null_free_inline_type()) {
 731               sig_type = sig_type->join_speculative(TypePtr::NOTNULL);
 732             }
 733             if (arg_type != NULL && !arg_type->higher_equal(sig_type) && !peek()->is_InlineType()) {
 734               Node* retnode = pop();
 735               Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
 736               push(cast_obj);
 737             }
 738           }
 739         } else {
 740           assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
 741           // push a zero; it's better than getting an oop/int mismatch
 742           pop_node(rt);
 743           Node* retnode = zerocon(ct);
 744           push_node(ct, retnode);
 745         }
 746         // Now that the value is well-behaved, continue with the call-site type.
 747         rtype = ctype;
 748       }
 749     } else {
 750       // Symbolic resolution enforces the types to be the same.
 751       // NOTE: We must relax the assert for unloaded types because two
 752       // different ciType instances of the same unloaded class type
 753       // can appear to be "loaded" by different loaders (depending on
 754       // the accessing class).
 755       assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
 756              "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
 757     }
 758 
 759     // If the return type of the method is not loaded, assert that the
 760     // value we got is a null.  Otherwise, we need to recompile.
 761     if (!rtype->is_loaded()) {
 762       if (PrintOpto && (Verbose || WizardMode)) {
 763         method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
 764         cg->method()->print_name(); tty->cr();
 765       }
 766       if (C->log() != NULL) {
 767         C->log()->elem("assert_null reason='return' klass='%d'",
 768                        C->log()->identify(rtype));
 769       }
 770       // If there is going to be a trap, put it at the next bytecode:
 771       set_bci(iter().next_bci());
 772       null_assert(peek());
 773       set_bci(iter().cur_bci()); // put it back
 774     }
 775     BasicType ct = ctype->basic_type();
 776     if (is_reference_type(ct)) {
 777       record_profiled_return_for_speculation();
 778     }
 779     if (rtype->basic_type() == T_PRIMITIVE_OBJECT && !peek()->is_InlineTypeBase()) {
 780       Node* retnode = pop();
 781       retnode = InlineTypeNode::make_from_oop(this, retnode, rtype->as_inline_klass(), !gvn().type(retnode)->maybe_null());
 782       push_node(T_PRIMITIVE_OBJECT, retnode);
 783     }
 784   }
 785 
 786   // Restart record of parsing work after possible inlining of call
 787 #ifndef PRODUCT
 788   parse_histogram()->set_initial_state(bc());
 789 #endif
 790 }
 791 
 792 //---------------------------catch_call_exceptions-----------------------------
 793 // Put a Catch and CatchProj nodes behind a just-created call.
 794 // Send their caught exceptions to the proper handler.
 795 // This may be used after a call to the rethrow VM stub,
 796 // when it is needed to process unloaded exception classes.
 797 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
 798   // Exceptions are delivered through this channel:
 799   Node* i_o = this->i_o();
 800 
 801   // Add a CatchNode.
 802   GrowableArray<int>* bcis = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, -1);
 803   GrowableArray<const Type*>* extypes = new (C->node_arena()) GrowableArray<const Type*>(C->node_arena(), 8, 0, NULL);
 804   GrowableArray<int>* saw_unloaded = new (C->node_arena()) GrowableArray<int>(C->node_arena(), 8, 0, 0);
 805 
 806   bool default_handler = false;
 807   for (; !handlers.is_done(); handlers.next()) {
 808     ciExceptionHandler* h        = handlers.handler();
 809     int                 h_bci    = h->handler_bci();
 810     ciInstanceKlass*    h_klass  = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
 811     // Do not introduce unloaded exception types into the graph:
 812     if (!h_klass->is_loaded()) {
 813       if (saw_unloaded->contains(h_bci)) {
 814         /* We've already seen an unloaded exception with h_bci,
 815            so don't duplicate. Duplication will cause the CatchNode to be
 816            unnecessarily large. See 4713716. */
 817         continue;
 818       } else {
 819         saw_unloaded->append(h_bci);
 820       }
 821     }
 822     const Type*         h_extype = TypeOopPtr::make_from_klass(h_klass);
 823     // (We use make_from_klass because it respects UseUniqueSubclasses.)
 824     h_extype = h_extype->join(TypeInstPtr::NOTNULL);
 825     assert(!h_extype->empty(), "sanity");
 826     // Note:  It's OK if the BCIs repeat themselves.
 827     bcis->append(h_bci);
 828     extypes->append(h_extype);
 829     if (h_bci == -1) {
 830       default_handler = true;
 831     }
 832   }
 833 
 834   if (!default_handler) {
 835     bcis->append(-1);
 836     extypes->append(TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr());
 837   }
 838 
 839   int len = bcis->length();
 840   CatchNode *cn = new CatchNode(control(), i_o, len+1);
 841   Node *catch_ = _gvn.transform(cn);
 842 
 843   // now branch with the exception state to each of the (potential)
 844   // handlers
 845   for(int i=0; i < len; i++) {
 846     // Setup JVM state to enter the handler.
 847     PreserveJVMState pjvms(this);
 848     // Locals are just copied from before the call.
 849     // Get control from the CatchNode.
 850     int handler_bci = bcis->at(i);
 851     Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci));
 852     // This handler cannot happen?
 853     if (ctrl == top())  continue;
 854     set_control(ctrl);
 855 
 856     // Create exception oop
 857     const TypeInstPtr* extype = extypes->at(i)->is_instptr();
 858     Node *ex_oop = _gvn.transform(new CreateExNode(extypes->at(i), ctrl, i_o));
 859 
 860     // Handle unloaded exception classes.
 861     if (saw_unloaded->contains(handler_bci)) {
 862       // An unloaded exception type is coming here.  Do an uncommon trap.
 863 #ifndef PRODUCT
 864       // We do not expect the same handler bci to take both cold unloaded
 865       // and hot loaded exceptions.  But, watch for it.
 866       if ((Verbose || WizardMode) && extype->is_loaded()) {
 867         tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
 868         method()->print_name(); tty->cr();
 869       } else if (PrintOpto && (Verbose || WizardMode)) {
 870         tty->print("Bailing out on unloaded exception type ");
 871         extype->klass()->print_name();
 872         tty->print(" at bci:%d in ", bci());
 873         method()->print_name(); tty->cr();
 874       }
 875 #endif
 876       // Emit an uncommon trap instead of processing the block.
 877       set_bci(handler_bci);
 878       push_ex_oop(ex_oop);
 879       uncommon_trap(Deoptimization::Reason_unloaded,
 880                     Deoptimization::Action_reinterpret,
 881                     extype->klass(), "!loaded exception");
 882       set_bci(iter().cur_bci()); // put it back
 883       continue;
 884     }
 885 
 886     // go to the exception handler
 887     if (handler_bci < 0) {     // merge with corresponding rethrow node
 888       throw_to_exit(make_exception_state(ex_oop));
 889     } else {                      // Else jump to corresponding handle
 890       push_ex_oop(ex_oop);        // Clear stack and push just the oop.
 891       merge_exception(handler_bci);
 892     }
 893   }
 894 
 895   // The first CatchProj is for the normal return.
 896   // (Note:  If this is a call to rethrow_Java, this node goes dead.)
 897   set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
 898 }
 899 
 900 
 901 //----------------------------catch_inline_exceptions--------------------------
 902 // Handle all exceptions thrown by an inlined method or individual bytecode.
 903 // Common case 1: we have no handler, so all exceptions merge right into
 904 // the rethrow case.
 905 // Case 2: we have some handlers, with loaded exception klasses that have
 906 // no subklasses.  We do a Deutsch-Shiffman style type-check on the incoming
 907 // exception oop and branch to the handler directly.
 908 // Case 3: We have some handlers with subklasses or are not loaded at
 909 // compile-time.  We have to call the runtime to resolve the exception.
 910 // So we insert a RethrowCall and all the logic that goes with it.
 911 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
 912   // Caller is responsible for saving away the map for normal control flow!
 913   assert(stopped(), "call set_map(NULL) first");
 914   assert(method()->has_exception_handlers(), "don't come here w/o work to do");
 915 
 916   Node* ex_node = saved_ex_oop(ex_map);
 917   if (ex_node == top()) {
 918     // No action needed.
 919     return;
 920   }
 921   const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
 922   NOT_PRODUCT(if (ex_type==NULL) tty->print_cr("*** Exception not InstPtr"));
 923   if (ex_type == NULL)
 924     ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
 925 
 926   // determine potential exception handlers
 927   ciExceptionHandlerStream handlers(method(), bci(),
 928                                     ex_type->klass()->as_instance_klass(),
 929                                     ex_type->klass_is_exact());
 930 
 931   // Start executing from the given throw state.  (Keep its stack, for now.)
 932   // Get the exception oop as known at compile time.
 933   ex_node = use_exception_state(ex_map);
 934 
 935   // Get the exception oop klass from its header
 936   Node* ex_klass_node = NULL;
 937   if (has_ex_handler() && !ex_type->klass_is_exact()) {
 938     Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
 939     ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
 940 
 941     // Compute the exception klass a little more cleverly.
 942     // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
 943     // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
 944     // each arm of the Phi.  If I know something clever about the exceptions
 945     // I'm loading the class from, I can replace the LoadKlass with the
 946     // klass constant for the exception oop.
 947     if (ex_node->is_Phi()) {
 948       ex_klass_node = new PhiNode(ex_node->in(0), TypeInstKlassPtr::OBJECT);
 949       for (uint i = 1; i < ex_node->req(); i++) {
 950         Node* ex_in = ex_node->in(i);
 951         if (ex_in == top() || ex_in == NULL) {
 952           // This path was not taken.
 953           ex_klass_node->init_req(i, top());
 954           continue;
 955         }
 956         Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
 957         Node* k = _gvn.transform( LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
 958         ex_klass_node->init_req( i, k );
 959       }
 960       _gvn.set_type(ex_klass_node, TypeInstKlassPtr::OBJECT);
 961 
 962     }
 963   }
 964 
 965   // Scan the exception table for applicable handlers.
 966   // If none, we can call rethrow() and be done!
 967   // If precise (loaded with no subklasses), insert a D.S. style
 968   // pointer compare to the correct handler and loop back.
 969   // If imprecise, switch to the Rethrow VM-call style handling.
 970 
 971   int remaining = handlers.count_remaining();
 972 
 973   // iterate through all entries sequentially
 974   for (;!handlers.is_done(); handlers.next()) {
 975     ciExceptionHandler* handler = handlers.handler();
 976 
 977     if (handler->is_rethrow()) {
 978       // If we fell off the end of the table without finding an imprecise
 979       // exception klass (and without finding a generic handler) then we
 980       // know this exception is not handled in this method.  We just rethrow
 981       // the exception into the caller.
 982       throw_to_exit(make_exception_state(ex_node));
 983       return;
 984     }
 985 
 986     // exception handler bci range covers throw_bci => investigate further
 987     int handler_bci = handler->handler_bci();
 988 
 989     if (remaining == 1) {
 990       push_ex_oop(ex_node);        // Push exception oop for handler
 991       if (PrintOpto && WizardMode) {
 992         tty->print_cr("  Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
 993       }
 994       merge_exception(handler_bci); // jump to handler
 995       return;                   // No more handling to be done here!
 996     }
 997 
 998     // Get the handler's klass
 999     ciInstanceKlass* klass = handler->catch_klass();
1000 
1001     if (!klass->is_loaded()) {  // klass is not loaded?
1002       // fall through into catch_call_exceptions which will emit a
1003       // handler with an uncommon trap.
1004       break;
1005     }
1006 
1007     if (klass->is_interface())  // should not happen, but...
1008       break;                    // bail out
1009 
1010     // Check the type of the exception against the catch type
1011     const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
1012     Node* con = _gvn.makecon(tk);
1013     Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
1014     if (!stopped()) {
1015       PreserveJVMState pjvms(this);
1016       const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
1017       assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
1018       Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
1019       push_ex_oop(ex_oop);      // Push exception oop for handler
1020       if (PrintOpto && WizardMode) {
1021         tty->print("  Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
1022         klass->print_name();
1023         tty->cr();
1024       }
1025       merge_exception(handler_bci);
1026     }
1027     set_control(not_subtype_ctrl);
1028 
1029     // Come here if exception does not match handler.
1030     // Carry on with more handler checks.
1031     --remaining;
1032   }
1033 
1034   assert(!stopped(), "you should return if you finish the chain");
1035 
1036   // Oops, need to call into the VM to resolve the klasses at runtime.
1037   // Note:  This call must not deoptimize, since it is not a real at this bci!
1038   kill_dead_locals();
1039 
1040   make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
1041                     OptoRuntime::rethrow_Type(),
1042                     OptoRuntime::rethrow_stub(),
1043                     NULL, NULL,
1044                     ex_node);
1045 
1046   // Rethrow is a pure call, no side effects, only a result.
1047   // The result cannot be allocated, so we use I_O
1048 
1049   // Catch exceptions from the rethrow
1050   catch_call_exceptions(handlers);
1051 }
1052 
1053 
1054 // (Note:  Moved add_debug_info into GraphKit::add_safepoint_edges.)
1055 
1056 
1057 #ifndef PRODUCT
1058 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
1059   if( CountCompiledCalls ) {
1060     if( at_method_entry ) {
1061       // bump invocation counter if top method (for statistics)
1062       if (CountCompiledCalls && depth() == 1) {
1063         const TypePtr* addr_type = TypeMetadataPtr::make(method());
1064         Node* adr1 = makecon(addr_type);
1065         Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
1066         increment_counter(adr2);
1067       }
1068     } else if (is_inline) {
1069       switch (bc()) {
1070       case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
1071       case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
1072       case Bytecodes::_invokestatic:
1073       case Bytecodes::_invokedynamic:
1074       case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
1075       default: fatal("unexpected call bytecode");
1076       }
1077     } else {
1078       switch (bc()) {
1079       case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
1080       case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
1081       case Bytecodes::_invokestatic:
1082       case Bytecodes::_invokedynamic:
1083       case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_static_calls_addr()); break;
1084       default: fatal("unexpected call bytecode");
1085       }
1086     }
1087   }
1088 }
1089 #endif //PRODUCT
1090 
1091 
1092 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, ciInstanceKlass* klass,
1093                                          ciKlass* holder, ciMethod* callee,
1094                                          const TypeOopPtr* receiver_type, bool is_virtual,
1095                                          bool& call_does_dispatch, int& vtable_index,
1096                                          bool check_access) {
1097   // Set default values for out-parameters.
1098   call_does_dispatch = true;
1099   vtable_index       = Method::invalid_vtable_index;
1100 
1101   // Choose call strategy.
1102   ciMethod* optimized_virtual_method = optimize_inlining(caller, klass, holder, callee,
1103                                                          receiver_type, check_access);
1104 
1105   // Have the call been sufficiently improved such that it is no longer a virtual?
1106   if (optimized_virtual_method != NULL) {
1107     callee             = optimized_virtual_method;
1108     call_does_dispatch = false;
1109   } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1110     // We can make a vtable call at this site
1111     vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1112   }
1113   return callee;
1114 }
1115 
1116 // Identify possible target method and inlining style
1117 ciMethod* Compile::optimize_inlining(ciMethod* caller, ciInstanceKlass* klass, ciKlass* holder,
1118                                      ciMethod* callee, const TypeOopPtr* receiver_type,
1119                                      bool check_access) {
1120   // only use for virtual or interface calls
1121 
1122   // If it is obviously final, do not bother to call find_monomorphic_target,
1123   // because the class hierarchy checks are not needed, and may fail due to
1124   // incompletely loaded classes.  Since we do our own class loading checks
1125   // in this module, we may confidently bind to any method.
1126   if (callee->can_be_statically_bound()) {
1127     return callee;
1128   }
1129 
1130   if (receiver_type == NULL) {
1131     return NULL; // no receiver type info
1132   }
1133 
1134   // Attempt to improve the receiver
1135   bool actual_receiver_is_exact = false;
1136   ciInstanceKlass* actual_receiver = klass;
1137   // Array methods are all inherited from Object, and are monomorphic.
1138   // finalize() call on array is not allowed.
1139   if (receiver_type->isa_aryptr() &&
1140       callee->holder() == env()->Object_klass() &&
1141       callee->name() != ciSymbols::finalize_method_name()) {
1142     return callee;
1143   }
1144 
1145   // All other interesting cases are instance klasses.
1146   if (!receiver_type->isa_instptr()) {
1147     return NULL;
1148   }
1149 
1150   ciInstanceKlass* receiver_klass = receiver_type->klass()->as_instance_klass();
1151   if (receiver_klass->is_loaded() && receiver_klass->is_initialized() && !receiver_klass->is_interface() &&
1152       (receiver_klass == actual_receiver || receiver_klass->is_subtype_of(actual_receiver))) {
1153     // ikl is a same or better type than the original actual_receiver,
1154     // e.g. static receiver from bytecodes.
1155     actual_receiver = receiver_klass;
1156     // Is the actual_receiver exact?
1157     actual_receiver_is_exact = receiver_type->klass_is_exact();
1158   }
1159 
1160   ciInstanceKlass*   calling_klass = caller->holder();
1161   ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1162 
1163   if (cha_monomorphic_target != NULL) {
1164     // Hardwiring a virtual.
1165     assert(!callee->can_be_statically_bound(), "should have been handled earlier");
1166     assert(!cha_monomorphic_target->is_abstract(), "");
1167     if (!cha_monomorphic_target->can_be_statically_bound(actual_receiver)) {
1168       // If we inlined because CHA revealed only a single target method,
1169       // then we are dependent on that target method not getting overridden
1170       // by dynamic class loading.  Be sure to test the "static" receiver
1171       // dest_method here, as opposed to the actual receiver, which may
1172       // falsely lead us to believe that the receiver is final or private.
1173       dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target, holder, callee);
1174     }
1175     return cha_monomorphic_target;
1176   }
1177 
1178   // If the type is exact, we can still bind the method w/o a vcall.
1179   // (This case comes after CHA so we can see how much extra work it does.)
1180   if (actual_receiver_is_exact) {
1181     // In case of evolution, there is a dependence on every inlined method, since each
1182     // such method can be changed when its class is redefined.
1183     ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1184     if (exact_method != NULL) {
1185       return exact_method;
1186     }
1187   }
1188 
1189   return NULL;
1190 }