1 /*
   2  * Copyright (c) 1998, 2024, 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 "logging/log.hpp"
  34 #include "logging/logLevel.hpp"
  35 #include "logging/logMessage.hpp"
  36 #include "logging/logStream.hpp"
  37 #include "opto/addnode.hpp"
  38 #include "opto/callGenerator.hpp"
  39 #include "opto/castnode.hpp"
  40 #include "opto/cfgnode.hpp"
  41 #include "opto/mulnode.hpp"
  42 #include "opto/parse.hpp"
  43 #include "opto/rootnode.hpp"
  44 #include "opto/runtime.hpp"
  45 #include "opto/subnode.hpp"
  46 #include "prims/methodHandles.hpp"
  47 #include "runtime/sharedRuntime.hpp"
  48 #include "utilities/macros.hpp"
  49 #if INCLUDE_JFR
  50 #include "jfr/jfr.hpp"
  51 #endif
  52 
  53 static void print_trace_type_profile(outputStream* out, int depth, ciKlass* prof_klass, int site_count, int receiver_count) {
  54   CompileTask::print_inline_indent(depth, out);
  55   out->print(" \\-> TypeProfile (%d/%d counts) = ", receiver_count, site_count);
  56   prof_klass->name()->print_symbol_on(out);
  57   out->cr();
  58 }
  59 
  60 static void trace_type_profile(Compile* C, ciMethod* method, int depth, int bci, ciMethod* prof_method,
  61                                ciKlass* prof_klass, int site_count, int receiver_count) {
  62   if (TraceTypeProfile || C->print_inlining()) {
  63     outputStream* out = tty;
  64     if (!C->print_inlining()) {
  65       if (!PrintOpto && !PrintCompilation) {
  66         method->print_short_name();
  67         tty->cr();
  68       }
  69       CompileTask::print_inlining_tty(prof_method, depth, bci, InliningResult::SUCCESS);
  70     } else {
  71       out = C->print_inlining_stream();
  72     }
  73     print_trace_type_profile(out, depth, prof_klass, site_count, receiver_count);
  74   }
  75 
  76   LogTarget(Debug, jit, inlining) lt;
  77   if (lt.is_enabled()) {
  78     LogStream ls(lt);
  79     print_trace_type_profile(&ls, depth, prof_klass, site_count, receiver_count);
  80   }
  81 }
  82 
  83 CallGenerator* Compile::call_generator(ciMethod* callee, int vtable_index, bool call_does_dispatch,
  84                                        JVMState* jvms, bool allow_inline,
  85                                        float prof_factor, ciKlass* speculative_receiver_type,
  86                                        bool allow_intrinsics) {
  87   assert(callee != nullptr, "failed method resolution");
  88 
  89   ciMethod*       caller      = jvms->method();
  90   int             bci         = jvms->bci();
  91   Bytecodes::Code bytecode    = caller->java_code_at_bci(bci);
  92   ciMethod*       orig_callee = caller->get_method_at_bci(bci);
  93 
  94   const bool is_virtual_or_interface = (bytecode == Bytecodes::_invokevirtual) ||
  95                                        (bytecode == Bytecodes::_invokeinterface) ||
  96                                        (orig_callee->intrinsic_id() == vmIntrinsics::_linkToVirtual) ||
  97                                        (orig_callee->intrinsic_id() == vmIntrinsics::_linkToInterface);
  98 
  99   // Dtrace currently doesn't work unless all calls are vanilla
 100   if (env()->dtrace_method_probes()) {
 101     allow_inline = false;
 102   }
 103 
 104   // Note: When we get profiling during stage-1 compiles, we want to pull
 105   // from more specific profile data which pertains to this inlining.
 106   // Right now, ignore the information in jvms->caller(), and do method[bci].
 107   ciCallProfile profile = caller->call_profile_at_bci(bci);
 108 
 109   // See how many times this site has been invoked.
 110   int site_count = profile.count();
 111   int receiver_count = -1;
 112   if (call_does_dispatch && UseTypeProfile && profile.has_receiver(0)) {
 113     // Receivers in the profile structure are ordered by call counts
 114     // so that the most called (major) receiver is profile.receiver(0).
 115     receiver_count = profile.receiver_count(0);
 116   }
 117 
 118   CompileLog* log = this->log();
 119   if (log != nullptr) {
 120     int rid = (receiver_count >= 0)? log->identify(profile.receiver(0)): -1;
 121     int r2id = (rid != -1 && profile.has_receiver(1))? log->identify(profile.receiver(1)):-1;
 122     log->begin_elem("call method='%d' count='%d' prof_factor='%f'",
 123                     log->identify(callee), site_count, prof_factor);
 124     if (call_does_dispatch)  log->print(" virtual='1'");
 125     if (allow_inline)     log->print(" inline='1'");
 126     if (receiver_count >= 0) {
 127       log->print(" receiver='%d' receiver_count='%d'", rid, receiver_count);
 128       if (profile.has_receiver(1)) {
 129         log->print(" receiver2='%d' receiver2_count='%d'", r2id, profile.receiver_count(1));
 130       }
 131     }
 132     if (callee->is_method_handle_intrinsic()) {
 133       log->print(" method_handle_intrinsic='1'");
 134     }
 135     log->end_elem();
 136   }
 137 
 138   // Special case the handling of certain common, profitable library
 139   // methods.  If these methods are replaced with specialized code,
 140   // then we return it as the inlined version of the call.
 141   CallGenerator* cg_intrinsic = nullptr;
 142   if (allow_inline && allow_intrinsics) {
 143     CallGenerator* cg = find_intrinsic(callee, call_does_dispatch);
 144     if (cg != nullptr) {
 145       if (cg->is_predicated()) {
 146         // Code without intrinsic but, hopefully, inlined.
 147         CallGenerator* inline_cg = this->call_generator(callee,
 148               vtable_index, call_does_dispatch, jvms, allow_inline, prof_factor, speculative_receiver_type, false);
 149         if (inline_cg != nullptr) {
 150           cg = CallGenerator::for_predicated_intrinsic(cg, inline_cg);
 151         }
 152       }
 153 
 154       // If intrinsic does the virtual dispatch, we try to use the type profile
 155       // first, and hopefully inline it as the regular virtual call below.
 156       // We will retry the intrinsic if nothing had claimed it afterwards.
 157       if (cg->does_virtual_dispatch()) {
 158         cg_intrinsic = cg;
 159         cg = nullptr;
 160       } else if (IncrementalInline && should_delay_vector_inlining(callee, jvms)) {
 161         return CallGenerator::for_late_inline(callee, cg);
 162       } else {
 163         return cg;
 164       }
 165     }
 166   }
 167 
 168   // Do method handle calls.
 169   // NOTE: This must happen before normal inlining logic below since
 170   // MethodHandle.invoke* are native methods which obviously don't
 171   // have bytecodes and so normal inlining fails.
 172   if (callee->is_method_handle_intrinsic()) {
 173     CallGenerator* cg = CallGenerator::for_method_handle_call(jvms, caller, callee, allow_inline);
 174     return cg;
 175   }
 176 
 177   // Attempt to inline...
 178   if (allow_inline) {
 179     // The profile data is only partly attributable to this caller,
 180     // scale back the call site information.
 181     float past_uses = jvms->method()->scale_count(site_count, prof_factor);
 182     // This is the number of times we expect the call code to be used.
 183     float expected_uses = past_uses;
 184 
 185     // Try inlining a bytecoded method:
 186     if (!call_does_dispatch) {
 187       InlineTree* ilt = InlineTree::find_subtree_from_root(this->ilt(), jvms->caller(), jvms->method());
 188       bool should_delay = C->should_delay_inlining();
 189       if (ilt->ok_to_inline(callee, jvms, profile, should_delay)) {
 190         CallGenerator* cg = CallGenerator::for_inline(callee, expected_uses);
 191         // For optimized virtual calls assert at runtime that receiver object
 192         // is a subtype of the inlined method holder. CHA can report a method
 193         // as a unique target under an abstract method, but receiver type
 194         // sometimes has a broader type. Similar scenario is possible with
 195         // default methods when type system loses information about implemented
 196         // interfaces.
 197         if (cg != nullptr && is_virtual_or_interface && !callee->is_static()) {
 198           CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
 199               Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
 200 
 201           cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
 202         }
 203         if (cg != nullptr) {
 204           // Delay the inlining of this method to give us the
 205           // opportunity to perform some high level optimizations
 206           // first.
 207           if (should_delay) {
 208             return CallGenerator::for_late_inline(callee, cg);
 209           } else if (should_delay_string_inlining(callee, jvms)) {
 210             return CallGenerator::for_string_late_inline(callee, cg);
 211           } else if (should_delay_boxing_inlining(callee, jvms)) {
 212             return CallGenerator::for_boxing_late_inline(callee, cg);
 213           } else if (should_delay_vector_reboxing_inlining(callee, jvms)) {
 214             return CallGenerator::for_vector_reboxing_late_inline(callee, cg);
 215           } else {
 216             return cg;
 217           }
 218         }
 219       }
 220     }
 221 
 222     // Try using the type profile.
 223     if (call_does_dispatch && site_count > 0 && UseTypeProfile) {
 224       // The major receiver's count >= TypeProfileMajorReceiverPercent of site_count.
 225       bool have_major_receiver = profile.has_receiver(0) && (100.*profile.receiver_prob(0) >= (float)TypeProfileMajorReceiverPercent);
 226       ciMethod* receiver_method = nullptr;
 227 
 228       int morphism = profile.morphism();
 229       if (speculative_receiver_type != nullptr) {
 230         if (!too_many_traps_or_recompiles(caller, bci, Deoptimization::Reason_speculate_class_check)) {
 231           // We have a speculative type, we should be able to resolve
 232           // the call. We do that before looking at the profiling at
 233           // this invoke because it may lead to bimorphic inlining which
 234           // a speculative type should help us avoid.
 235           receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 236                                                    speculative_receiver_type);
 237           if (receiver_method == nullptr) {
 238             speculative_receiver_type = nullptr;
 239           } else {
 240             morphism = 1;
 241           }
 242         } else {
 243           // speculation failed before. Use profiling at the call
 244           // (could allow bimorphic inlining for instance).
 245           speculative_receiver_type = nullptr;
 246         }
 247       }
 248       if (receiver_method == nullptr &&
 249           (have_major_receiver || morphism == 1 ||
 250            (morphism == 2 && UseBimorphicInlining))) {
 251         // receiver_method = profile.method();
 252         // Profiles do not suggest methods now.  Look it up in the major receiver.
 253         receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 254                                                       profile.receiver(0));
 255       }
 256       if (receiver_method != nullptr) {
 257         // The single majority receiver sufficiently outweighs the minority.
 258         CallGenerator* hit_cg = this->call_generator(receiver_method,
 259               vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
 260         if (hit_cg != nullptr) {
 261           // Look up second receiver.
 262           CallGenerator* next_hit_cg = nullptr;
 263           ciMethod* next_receiver_method = nullptr;
 264           if (morphism == 2 && UseBimorphicInlining) {
 265             next_receiver_method = callee->resolve_invoke(jvms->method()->holder(),
 266                                                                profile.receiver(1));
 267             if (next_receiver_method != nullptr) {
 268               next_hit_cg = this->call_generator(next_receiver_method,
 269                                   vtable_index, !call_does_dispatch, jvms,
 270                                   allow_inline, prof_factor);
 271               if (next_hit_cg != nullptr && !next_hit_cg->is_inline() &&
 272                   have_major_receiver && UseOnlyInlinedBimorphic) {
 273                   // Skip if we can't inline second receiver's method
 274                   next_hit_cg = nullptr;
 275               }
 276             }
 277           }
 278           CallGenerator* miss_cg;
 279           Deoptimization::DeoptReason reason = (morphism == 2
 280                                                ? Deoptimization::Reason_bimorphic
 281                                                : Deoptimization::reason_class_check(speculative_receiver_type != nullptr));
 282           if ((morphism == 1 || (morphism == 2 && next_hit_cg != nullptr)) &&
 283               !too_many_traps_or_recompiles(caller, bci, reason)
 284              ) {
 285             // Generate uncommon trap for class check failure path
 286             // in case of monomorphic or bimorphic virtual call site.
 287             miss_cg = CallGenerator::for_uncommon_trap(callee, reason,
 288                         Deoptimization::Action_maybe_recompile);
 289           } else {
 290             // Generate virtual call for class check failure path
 291             // in case of polymorphic virtual call site.
 292             miss_cg = (IncrementalInlineVirtual ? CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor)
 293                                                 : CallGenerator::for_virtual_call(callee, vtable_index));
 294           }
 295           if (miss_cg != nullptr) {
 296             if (next_hit_cg != nullptr) {
 297               assert(speculative_receiver_type == nullptr, "shouldn't end up here if we used speculation");
 298               trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), next_receiver_method, profile.receiver(1), site_count, profile.receiver_count(1));
 299               // We don't need to record dependency on a receiver here and below.
 300               // Whenever we inline, the dependency is added by Parse::Parse().
 301               miss_cg = CallGenerator::for_predicted_call(profile.receiver(1), miss_cg, next_hit_cg, PROB_MAX);
 302             }
 303             if (miss_cg != nullptr) {
 304               ciKlass* k = speculative_receiver_type != nullptr ? speculative_receiver_type : profile.receiver(0);
 305               trace_type_profile(C, jvms->method(), jvms->depth() - 1, jvms->bci(), receiver_method, k, site_count, receiver_count);
 306               float hit_prob = speculative_receiver_type != nullptr ? 1.0 : profile.receiver_prob(0);
 307               CallGenerator* cg = CallGenerator::for_predicted_call(k, miss_cg, hit_cg, hit_prob);
 308               if (cg != nullptr)  return cg;
 309             }
 310           }
 311         }
 312       }
 313     }
 314 
 315     // If there is only one implementor of this interface then we
 316     // may be able to bind this invoke directly to the implementing
 317     // klass but we need both a dependence on the single interface
 318     // and on the method we bind to. Additionally since all we know
 319     // about the receiver type is that it's supposed to implement the
 320     // interface we have to insert a check that it's the class we
 321     // expect.  Interface types are not checked by the verifier so
 322     // they are roughly equivalent to Object.
 323     // The number of implementors for declared_interface is less or
 324     // equal to the number of implementors for target->holder() so
 325     // if number of implementors of target->holder() == 1 then
 326     // number of implementors for decl_interface is 0 or 1. If
 327     // it's 0 then no class implements decl_interface and there's
 328     // no point in inlining.
 329     if (call_does_dispatch && bytecode == Bytecodes::_invokeinterface) {
 330       ciInstanceKlass* declared_interface =
 331           caller->get_declared_method_holder_at_bci(bci)->as_instance_klass();
 332       ciInstanceKlass* singleton = declared_interface->unique_implementor();
 333 
 334       if (singleton != nullptr) {
 335         assert(singleton != declared_interface, "not a unique implementor");
 336 
 337         ciMethod* cha_monomorphic_target =
 338             callee->find_monomorphic_target(caller->holder(), declared_interface, singleton);
 339 
 340         if (cha_monomorphic_target != nullptr &&
 341             cha_monomorphic_target->holder() != env()->Object_klass()) { // subtype check against Object is useless
 342           ciKlass* holder = cha_monomorphic_target->holder();
 343 
 344           // Try to inline the method found by CHA. Inlined method is guarded by the type check.
 345           CallGenerator* hit_cg = call_generator(cha_monomorphic_target,
 346               vtable_index, !call_does_dispatch, jvms, allow_inline, prof_factor);
 347 
 348           // Deoptimize on type check fail. The interpreter will throw ICCE for us.
 349           CallGenerator* miss_cg = CallGenerator::for_uncommon_trap(callee,
 350               Deoptimization::Reason_class_check, Deoptimization::Action_none);
 351 
 352           ciKlass* constraint = (holder->is_subclass_of(singleton) ? holder : singleton); // avoid upcasts
 353           CallGenerator* cg = CallGenerator::for_guarded_call(constraint, miss_cg, hit_cg);
 354           if (hit_cg != nullptr && cg != nullptr) {
 355             dependencies()->assert_unique_implementor(declared_interface, singleton);
 356             dependencies()->assert_unique_concrete_method(declared_interface, cha_monomorphic_target, declared_interface, callee);
 357             return cg;
 358           }
 359         }
 360       }
 361     } // call_does_dispatch && bytecode == Bytecodes::_invokeinterface
 362 
 363     // Nothing claimed the intrinsic, we go with straight-forward inlining
 364     // for already discovered intrinsic.
 365     if (allow_intrinsics && cg_intrinsic != nullptr) {
 366       assert(cg_intrinsic->does_virtual_dispatch(), "sanity");
 367       return cg_intrinsic;
 368     }
 369   } // allow_inline
 370 
 371   // There was no special inlining tactic, or it bailed out.
 372   // Use a more generic tactic, like a simple call.
 373   if (call_does_dispatch) {
 374     const char* msg = "virtual call";
 375     if (C->print_inlining()) {
 376       print_inlining(callee, jvms->depth() - 1, jvms->bci(), InliningResult::FAILURE, msg);
 377     }
 378     C->log_inline_failure(msg);
 379     if (IncrementalInlineVirtual && allow_inline) {
 380       return CallGenerator::for_late_inline_virtual(callee, vtable_index, prof_factor); // attempt to inline through virtual call later
 381     } else {
 382       return CallGenerator::for_virtual_call(callee, vtable_index);
 383     }
 384   } else {
 385     // Class Hierarchy Analysis or Type Profile reveals a unique target, or it is a static or special call.
 386     CallGenerator* cg = CallGenerator::for_direct_call(callee, should_delay_inlining(callee, jvms));
 387     // For optimized virtual calls assert at runtime that receiver object
 388     // is a subtype of the method holder.
 389     if (cg != nullptr && is_virtual_or_interface && !callee->is_static()) {
 390       CallGenerator* trap_cg = CallGenerator::for_uncommon_trap(callee,
 391           Deoptimization::Reason_receiver_constraint, Deoptimization::Action_none);
 392       cg = CallGenerator::for_guarded_call(callee->holder(), trap_cg, cg);
 393     }
 394     return cg;
 395   }
 396 }
 397 
 398 // Return true for methods that shouldn't be inlined early so that
 399 // they are easier to analyze and optimize as intrinsics.
 400 bool Compile::should_delay_string_inlining(ciMethod* call_method, JVMState* jvms) {
 401   if (has_stringbuilder()) {
 402 
 403     if ((call_method->holder() == C->env()->StringBuilder_klass() ||
 404          call_method->holder() == C->env()->StringBuffer_klass()) &&
 405         (jvms->method()->holder() == C->env()->StringBuilder_klass() ||
 406          jvms->method()->holder() == C->env()->StringBuffer_klass())) {
 407       // Delay SB calls only when called from non-SB code
 408       return false;
 409     }
 410 
 411     switch (call_method->intrinsic_id()) {
 412       case vmIntrinsics::_StringBuilder_void:
 413       case vmIntrinsics::_StringBuilder_int:
 414       case vmIntrinsics::_StringBuilder_String:
 415       case vmIntrinsics::_StringBuilder_append_char:
 416       case vmIntrinsics::_StringBuilder_append_int:
 417       case vmIntrinsics::_StringBuilder_append_String:
 418       case vmIntrinsics::_StringBuilder_toString:
 419       case vmIntrinsics::_StringBuffer_void:
 420       case vmIntrinsics::_StringBuffer_int:
 421       case vmIntrinsics::_StringBuffer_String:
 422       case vmIntrinsics::_StringBuffer_append_char:
 423       case vmIntrinsics::_StringBuffer_append_int:
 424       case vmIntrinsics::_StringBuffer_append_String:
 425       case vmIntrinsics::_StringBuffer_toString:
 426       case vmIntrinsics::_Integer_toString:
 427         return true;
 428 
 429       case vmIntrinsics::_String_String:
 430         {
 431           Node* receiver = jvms->map()->in(jvms->argoff() + 1);
 432           if (receiver->is_Proj() && receiver->in(0)->is_CallStaticJava()) {
 433             CallStaticJavaNode* csj = receiver->in(0)->as_CallStaticJava();
 434             ciMethod* m = csj->method();
 435             if (m != nullptr &&
 436                 (m->intrinsic_id() == vmIntrinsics::_StringBuffer_toString ||
 437                  m->intrinsic_id() == vmIntrinsics::_StringBuilder_toString))
 438               // Delay String.<init>(new SB())
 439               return true;
 440           }
 441           return false;
 442         }
 443 
 444       default:
 445         return false;
 446     }
 447   }
 448   return false;
 449 }
 450 
 451 bool Compile::should_delay_boxing_inlining(ciMethod* call_method, JVMState* jvms) {
 452   if (eliminate_boxing() && call_method->is_boxing_method()) {
 453     set_has_boxed_value(true);
 454     return aggressive_unboxing();
 455   }
 456   return false;
 457 }
 458 
 459 bool Compile::should_delay_vector_inlining(ciMethod* call_method, JVMState* jvms) {
 460   return EnableVectorSupport && call_method->is_vector_method();
 461 }
 462 
 463 bool Compile::should_delay_vector_reboxing_inlining(ciMethod* call_method, JVMState* jvms) {
 464   return EnableVectorSupport && (call_method->intrinsic_id() == vmIntrinsics::_VectorRebox);
 465 }
 466 
 467 // uncommon-trap call-sites where callee is unloaded, uninitialized or will not link
 468 bool Parse::can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass* klass) {
 469   // Additional inputs to consider...
 470   // bc      = bc()
 471   // caller  = method()
 472   // iter().get_method_holder_index()
 473   assert( dest_method->is_loaded(), "ciTypeFlow should not let us get here" );
 474   // Interface classes can be loaded & linked and never get around to
 475   // being initialized.  Uncommon-trap for not-initialized static or
 476   // v-calls.  Let interface calls happen.
 477   ciInstanceKlass* holder_klass = dest_method->holder();
 478   if (!holder_klass->is_being_initialized() &&
 479       !holder_klass->is_initialized() &&
 480       !holder_klass->is_interface()) {
 481     uncommon_trap(Deoptimization::Reason_uninitialized,
 482                   Deoptimization::Action_reinterpret,
 483                   holder_klass);
 484     return true;
 485   }
 486 
 487   assert(dest_method->is_loaded(), "dest_method: typeflow responsibility");
 488   return false;
 489 }
 490 
 491 #ifdef ASSERT
 492 static bool check_call_consistency(JVMState* jvms, CallGenerator* cg) {
 493   ciMethod* symbolic_info = jvms->method()->get_method_at_bci(jvms->bci());
 494   ciMethod* resolved_method = cg->method();
 495   if (!ciMethod::is_consistent_info(symbolic_info, resolved_method)) {
 496     tty->print_cr("JVMS:");
 497     jvms->dump();
 498     tty->print_cr("Bytecode info:");
 499     jvms->method()->get_method_at_bci(jvms->bci())->print(); tty->cr();
 500     tty->print_cr("Resolved method:");
 501     cg->method()->print(); tty->cr();
 502     return false;
 503   }
 504   return true;
 505 }
 506 #endif // ASSERT
 507 
 508 //------------------------------do_call----------------------------------------
 509 // Handle your basic call.  Inline if we can & want to, else just setup call.
 510 void Parse::do_call() {
 511   // It's likely we are going to add debug info soon.
 512   // Also, if we inline a guy who eventually needs debug info for this JVMS,
 513   // our contribution to it is cleaned up right here.
 514   kill_dead_locals();
 515 
 516   C->print_inlining_assert_ready();
 517 
 518   // Set frequently used booleans
 519   const bool is_virtual = bc() == Bytecodes::_invokevirtual;
 520   const bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
 521   const bool has_receiver = Bytecodes::has_receiver(bc());
 522 
 523   // Find target being called
 524   bool             will_link;
 525   ciSignature*     declared_signature = nullptr;
 526   ciMethod*        orig_callee  = iter().get_method(will_link, &declared_signature);  // callee in the bytecode
 527   ciInstanceKlass* holder_klass = orig_callee->holder();
 528   ciKlass*         holder       = iter().get_declared_method_holder();
 529   ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
 530   assert(declared_signature != nullptr, "cannot be null");
 531   JFR_ONLY(Jfr::on_resolution(this, holder, orig_callee);)
 532 
 533   // Bump max node limit for JSR292 users
 534   if (bc() == Bytecodes::_invokedynamic || orig_callee->is_method_handle_intrinsic()) {
 535     C->set_max_node_limit(3*MaxNodeLimit);
 536   }
 537 
 538   // uncommon-trap when callee is unloaded, uninitialized or will not link
 539   // bailout when too many arguments for register representation
 540   if (!will_link || can_not_compile_call_site(orig_callee, klass)) {
 541     if (PrintOpto && (Verbose || WizardMode)) {
 542       method()->print_name(); tty->print_cr(" can not compile call at bci %d to:", bci());
 543       orig_callee->print_name(); tty->cr();
 544     }
 545     return;
 546   }
 547   assert(holder_klass->is_loaded(), "");
 548   //assert((bc_callee->is_static() || is_invokedynamic) == !has_receiver , "must match bc");  // XXX invokehandle (cur_bc_raw)
 549   // Note: this takes into account invokeinterface of methods declared in java/lang/Object,
 550   // which should be invokevirtuals but according to the VM spec may be invokeinterfaces
 551   assert(holder_klass->is_interface() || holder_klass->super() == nullptr || (bc() != Bytecodes::_invokeinterface), "must match bc");
 552   // Note:  In the absence of miranda methods, an abstract class K can perform
 553   // an invokevirtual directly on an interface method I.m if K implements I.
 554 
 555   // orig_callee is the resolved callee which's signature includes the
 556   // appendix argument.
 557   const int nargs = orig_callee->arg_size();
 558   const bool is_signature_polymorphic = MethodHandles::is_signature_polymorphic(orig_callee->intrinsic_id());
 559 
 560   // Push appendix argument (MethodType, CallSite, etc.), if one.
 561   if (iter().has_appendix()) {
 562     ciObject* appendix_arg = iter().get_appendix();
 563     const TypeOopPtr* appendix_arg_type = TypeOopPtr::make_from_constant(appendix_arg, /* require_const= */ true);
 564     Node* appendix_arg_node = _gvn.makecon(appendix_arg_type);
 565     push(appendix_arg_node);
 566   }
 567 
 568   // ---------------------
 569   // Does Class Hierarchy Analysis reveal only a single target of a v-call?
 570   // Then we may inline or make a static call, but become dependent on there being only 1 target.
 571   // Does the call-site type profile reveal only one receiver?
 572   // Then we may introduce a run-time check and inline on the path where it succeeds.
 573   // The other path may uncommon_trap, check for another receiver, or do a v-call.
 574 
 575   // Try to get the most accurate receiver type
 576   ciMethod* callee             = orig_callee;
 577   int       vtable_index       = Method::invalid_vtable_index;
 578   bool      call_does_dispatch = false;
 579 
 580   // Speculative type of the receiver if any
 581   ciKlass* speculative_receiver_type = nullptr;
 582   if (is_virtual_or_interface) {
 583     Node* receiver_node             = stack(sp() - nargs);
 584     const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
 585     // call_does_dispatch and vtable_index are out-parameters.  They might be changed.
 586     // For arrays, klass below is Object. When vtable calls are used,
 587     // resolving the call with Object would allow an illegal call to
 588     // finalize() on an array. We use holder instead: illegal calls to
 589     // finalize() won't be compiled as vtable calls (IC call
 590     // resolution will catch the illegal call) and the few legal calls
 591     // on array types won't be either.
 592     callee = C->optimize_virtual_call(method(), klass, holder, orig_callee,
 593                                       receiver_type, is_virtual,
 594                                       call_does_dispatch, vtable_index);  // out-parameters
 595     speculative_receiver_type = receiver_type != nullptr ? receiver_type->speculative_type() : nullptr;
 596   }
 597 
 598   // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
 599   ciKlass* receiver_constraint = nullptr;
 600   if (iter().cur_bc_raw() == Bytecodes::_invokespecial && !orig_callee->is_object_initializer()) {
 601     ciInstanceKlass* calling_klass = method()->holder();
 602     ciInstanceKlass* sender_klass = calling_klass;
 603     if (sender_klass->is_interface()) {
 604       receiver_constraint = sender_klass;
 605     }
 606   } else if (iter().cur_bc_raw() == Bytecodes::_invokeinterface && orig_callee->is_private()) {
 607     assert(holder->is_interface(), "How did we get a non-interface method here!");
 608     receiver_constraint = holder;
 609   }
 610 
 611   if (receiver_constraint != nullptr) {
 612     Node* receiver_node = stack(sp() - nargs);
 613     Node* cls_node = makecon(TypeKlassPtr::make(receiver_constraint, Type::trust_interfaces));
 614     Node* bad_type_ctrl = nullptr;
 615     Node* casted_receiver = gen_checkcast(receiver_node, cls_node, &bad_type_ctrl);
 616     if (bad_type_ctrl != nullptr) {
 617       PreserveJVMState pjvms(this);
 618       set_control(bad_type_ctrl);
 619       uncommon_trap(Deoptimization::Reason_class_check,
 620                     Deoptimization::Action_none);
 621     }
 622     if (stopped()) {
 623       return; // MUST uncommon-trap?
 624     }
 625     set_stack(sp() - nargs, casted_receiver);
 626   }
 627 
 628   // Note:  It's OK to try to inline a virtual call.
 629   // The call generator will not attempt to inline a polymorphic call
 630   // unless it knows how to optimize the receiver dispatch.
 631   bool try_inline = (C->do_inlining() || InlineAccessors);
 632 
 633   // ---------------------
 634   dec_sp(nargs);              // Temporarily pop args for JVM state of call
 635   JVMState* jvms = sync_jvms();
 636 
 637   // ---------------------
 638   // Decide call tactic.
 639   // This call checks with CHA, the interpreter profile, intrinsics table, etc.
 640   // It decides whether inlining is desirable or not.
 641   CallGenerator* cg = C->call_generator(callee, vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type);
 642 
 643   // NOTE:  Don't use orig_callee and callee after this point!  Use cg->method() instead.
 644   orig_callee = callee = nullptr;
 645 
 646   // ---------------------
 647   // Round double arguments before call
 648   round_double_arguments(cg->method());
 649 
 650   // Feed profiling data for arguments to the type system so it can
 651   // propagate it as speculative types
 652   record_profiled_arguments_for_speculation(cg->method(), bc());
 653 
 654 #ifndef PRODUCT
 655   // bump global counters for calls
 656   count_compiled_calls(/*at_method_entry*/ false, cg->is_inline());
 657 
 658   // Record first part of parsing work for this call
 659   parse_histogram()->record_change();
 660 #endif // not PRODUCT
 661 
 662   assert(jvms == this->jvms(), "still operating on the right JVMS");
 663   assert(jvms_in_sync(),       "jvms must carry full info into CG");
 664 
 665   // save across call, for a subsequent cast_not_null.
 666   Node* receiver = has_receiver ? argument(0) : nullptr;
 667 
 668   // The extra CheckCastPPs for speculative types mess with PhaseStringOpts
 669   if (receiver != nullptr && !call_does_dispatch && !cg->is_string_late_inline()) {
 670     // Feed profiling data for a single receiver to the type system so
 671     // it can propagate it as a speculative type
 672     receiver = record_profiled_receiver_for_speculation(receiver);
 673   }
 674 
 675   JVMState* new_jvms = cg->generate(jvms);
 676   if (new_jvms == nullptr) {
 677     // When inlining attempt fails (e.g., too many arguments),
 678     // it may contaminate the current compile state, making it
 679     // impossible to pull back and try again.  Once we call
 680     // cg->generate(), we are committed.  If it fails, the whole
 681     // compilation task is compromised.
 682     if (failing())  return;
 683 
 684     // This can happen if a library intrinsic is available, but refuses
 685     // the call site, perhaps because it did not match a pattern the
 686     // intrinsic was expecting to optimize. Should always be possible to
 687     // get a normal java call that may inline in that case
 688     cg = C->call_generator(cg->method(), vtable_index, call_does_dispatch, jvms, try_inline, prof_factor(), speculative_receiver_type, /* allow_intrinsics= */ false);
 689     new_jvms = cg->generate(jvms);
 690     if (new_jvms == nullptr) {
 691       guarantee(failing(), "call failed to generate:  calls should work");
 692       return;
 693     }
 694   }
 695 
 696   if (cg->is_inline()) {
 697     // Accumulate has_loops estimate
 698     C->env()->notice_inlined_method(cg->method());
 699   }
 700 
 701   // Reset parser state from [new_]jvms, which now carries results of the call.
 702   // Return value (if any) is already pushed on the stack by the cg.
 703   add_exception_states_from(new_jvms);
 704   if (new_jvms->map()->control() == top()) {
 705     stop_and_kill_map();
 706   } else {
 707     assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
 708     set_jvms(new_jvms);
 709   }
 710 
 711   assert(check_call_consistency(jvms, cg), "inconsistent info");
 712 
 713   if (!stopped()) {
 714     // This was some sort of virtual call, which did a null check for us.
 715     // Now we can assert receiver-not-null, on the normal return path.
 716     if (receiver != nullptr && cg->is_virtual()) {
 717       Node* cast = cast_not_null(receiver);
 718       // %%% assert(receiver == cast, "should already have cast the receiver");
 719     }
 720 
 721     ciType* rtype = cg->method()->return_type();
 722     ciType* ctype = declared_signature->return_type();
 723 
 724     if (Bytecodes::has_optional_appendix(iter().cur_bc_raw()) || is_signature_polymorphic) {
 725       // Be careful here with return types.
 726       if (ctype != rtype) {
 727         BasicType rt = rtype->basic_type();
 728         BasicType ct = ctype->basic_type();
 729         if (ct == T_VOID) {
 730           // It's OK for a method  to return a value that is discarded.
 731           // The discarding does not require any special action from the caller.
 732           // The Java code knows this, at VerifyType.isNullConversion.
 733           pop_node(rt);  // whatever it was, pop it
 734         } else if (rt == T_INT || is_subword_type(rt)) {
 735           // Nothing.  These cases are handled in lambda form bytecode.
 736           assert(ct == T_INT || is_subword_type(ct), "must match: rt=%s, ct=%s", type2name(rt), type2name(ct));
 737         } else if (is_reference_type(rt)) {
 738           assert(is_reference_type(ct), "rt=%s, ct=%s", type2name(rt), type2name(ct));
 739           if (ctype->is_loaded()) {
 740             const TypeOopPtr* arg_type = TypeOopPtr::make_from_klass(rtype->as_klass());
 741             const Type*       sig_type = TypeOopPtr::make_from_klass(ctype->as_klass());
 742             if (arg_type != nullptr && !arg_type->higher_equal(sig_type)) {
 743               Node* retnode = pop();
 744               Node* cast_obj = _gvn.transform(new CheckCastPPNode(control(), retnode, sig_type));
 745               push(cast_obj);
 746             }
 747           }
 748         } else {
 749           assert(rt == ct, "unexpected mismatch: rt=%s, ct=%s", type2name(rt), type2name(ct));
 750           // push a zero; it's better than getting an oop/int mismatch
 751           pop_node(rt);
 752           Node* retnode = zerocon(ct);
 753           push_node(ct, retnode);
 754         }
 755         // Now that the value is well-behaved, continue with the call-site type.
 756         rtype = ctype;
 757       }
 758     } else {
 759       // Symbolic resolution enforces the types to be the same.
 760       // NOTE: We must relax the assert for unloaded types because two
 761       // different ciType instances of the same unloaded class type
 762       // can appear to be "loaded" by different loaders (depending on
 763       // the accessing class).
 764       assert(!rtype->is_loaded() || !ctype->is_loaded() || rtype == ctype,
 765              "mismatched return types: rtype=%s, ctype=%s", rtype->name(), ctype->name());
 766     }
 767 
 768     // If the return type of the method is not loaded, assert that the
 769     // value we got is a null.  Otherwise, we need to recompile.
 770     if (!rtype->is_loaded()) {
 771       if (PrintOpto && (Verbose || WizardMode)) {
 772         method()->print_name(); tty->print_cr(" asserting nullness of result at bci: %d", bci());
 773         cg->method()->print_name(); tty->cr();
 774       }
 775       if (C->log() != nullptr) {
 776         C->log()->elem("assert_null reason='return' klass='%d'",
 777                        C->log()->identify(rtype));
 778       }
 779       // If there is going to be a trap, put it at the next bytecode:
 780       set_bci(iter().next_bci());
 781       null_assert(peek());
 782       set_bci(iter().cur_bci()); // put it back
 783     }
 784     BasicType ct = ctype->basic_type();
 785     if (is_reference_type(ct)) {
 786       record_profiled_return_for_speculation();
 787     }
 788   }
 789 
 790   // Restart record of parsing work after possible inlining of call
 791 #ifndef PRODUCT
 792   parse_histogram()->set_initial_state(bc());
 793 #endif
 794 }
 795 
 796 //---------------------------catch_call_exceptions-----------------------------
 797 // Put a Catch and CatchProj nodes behind a just-created call.
 798 // Send their caught exceptions to the proper handler.
 799 // This may be used after a call to the rethrow VM stub,
 800 // when it is needed to process unloaded exception classes.
 801 void Parse::catch_call_exceptions(ciExceptionHandlerStream& handlers) {
 802   // Exceptions are delivered through this channel:
 803   Node* i_o = this->i_o();
 804 
 805   // Add a CatchNode.
 806   Arena tmp_mem{mtCompiler};
 807   GrowableArray<int> bcis(&tmp_mem, 8, 0, -1);
 808   GrowableArray<const Type*> extypes(&tmp_mem, 8, 0, nullptr);
 809   GrowableArray<int> saw_unloaded(&tmp_mem, 8, 0, -1);
 810 
 811   bool default_handler = false;
 812   for (; !handlers.is_done(); handlers.next()) {
 813     ciExceptionHandler* h       = handlers.handler();
 814     int                 h_bci   = h->handler_bci();
 815     ciInstanceKlass*    h_klass = h->is_catch_all() ? env()->Throwable_klass() : h->catch_klass();
 816     // Do not introduce unloaded exception types into the graph:
 817     if (!h_klass->is_loaded()) {
 818       if (saw_unloaded.contains(h_bci)) {
 819         /* We've already seen an unloaded exception with h_bci,
 820            so don't duplicate. Duplication will cause the CatchNode to be
 821            unnecessarily large. See 4713716. */
 822         continue;
 823       } else {
 824         saw_unloaded.append(h_bci);
 825       }
 826     }
 827     const Type* h_extype = TypeOopPtr::make_from_klass(h_klass);
 828     // (We use make_from_klass because it respects UseUniqueSubclasses.)
 829     h_extype = h_extype->join(TypeInstPtr::NOTNULL);
 830     assert(!h_extype->empty(), "sanity");
 831     // Note: It's OK if the BCIs repeat themselves.
 832     bcis.append(h_bci);
 833     extypes.append(h_extype);
 834     if (h_bci == -1) {
 835       default_handler = true;
 836     }
 837   }
 838 
 839   if (!default_handler) {
 840     bcis.append(-1);
 841     const Type* extype = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
 842     extype = extype->join(TypeInstPtr::NOTNULL);
 843     extypes.append(extype);
 844   }
 845 
 846   int len = bcis.length();
 847   CatchNode *cn = new CatchNode(control(), i_o, len+1);
 848   Node *catch_ = _gvn.transform(cn);
 849 
 850   // now branch with the exception state to each of the (potential)
 851   // handlers
 852   for(int i=0; i < len; i++) {
 853     // Setup JVM state to enter the handler.
 854     PreserveJVMState pjvms(this);
 855     // Locals are just copied from before the call.
 856     // Get control from the CatchNode.
 857     int handler_bci = bcis.at(i);
 858     Node* ctrl = _gvn.transform( new CatchProjNode(catch_, i+1,handler_bci));
 859     // This handler cannot happen?
 860     if (ctrl == top())  continue;
 861     set_control(ctrl);
 862 
 863     // Create exception oop
 864     const TypeInstPtr* extype = extypes.at(i)->is_instptr();
 865     Node* ex_oop = _gvn.transform(new CreateExNode(extypes.at(i), ctrl, i_o));
 866 
 867     // Handle unloaded exception classes.
 868     if (saw_unloaded.contains(handler_bci)) {
 869       // An unloaded exception type is coming here.  Do an uncommon trap.
 870 #ifndef PRODUCT
 871       // We do not expect the same handler bci to take both cold unloaded
 872       // and hot loaded exceptions.  But, watch for it.
 873       if (PrintOpto && (Verbose || WizardMode) && extype->is_loaded()) {
 874         tty->print("Warning: Handler @%d takes mixed loaded/unloaded exceptions in ", bci());
 875         method()->print_name(); tty->cr();
 876       } else if (PrintOpto && (Verbose || WizardMode)) {
 877         tty->print("Bailing out on unloaded exception type ");
 878         extype->instance_klass()->print_name();
 879         tty->print(" at bci:%d in ", bci());
 880         method()->print_name(); tty->cr();
 881       }
 882 #endif
 883       // Emit an uncommon trap instead of processing the block.
 884       set_bci(handler_bci);
 885       push_ex_oop(ex_oop);
 886       uncommon_trap(Deoptimization::Reason_unloaded,
 887                     Deoptimization::Action_reinterpret,
 888                     extype->instance_klass(), "!loaded exception");
 889       set_bci(iter().cur_bci()); // put it back
 890       continue;
 891     }
 892 
 893     // go to the exception handler
 894     if (handler_bci < 0) {     // merge with corresponding rethrow node
 895       throw_to_exit(make_exception_state(ex_oop));
 896     } else {                      // Else jump to corresponding handle
 897       push_ex_oop(ex_oop);        // Clear stack and push just the oop.
 898       merge_exception(handler_bci);
 899     }
 900   }
 901 
 902   // The first CatchProj is for the normal return.
 903   // (Note:  If this is a call to rethrow_Java, this node goes dead.)
 904   set_control(_gvn.transform( new CatchProjNode(catch_, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci)));
 905 }
 906 
 907 
 908 //----------------------------catch_inline_exceptions--------------------------
 909 // Handle all exceptions thrown by an inlined method or individual bytecode.
 910 // Common case 1: we have no handler, so all exceptions merge right into
 911 // the rethrow case.
 912 // Case 2: we have some handlers, with loaded exception klasses that have
 913 // no subklasses.  We do a Deutsch-Schiffman style type-check on the incoming
 914 // exception oop and branch to the handler directly.
 915 // Case 3: We have some handlers with subklasses or are not loaded at
 916 // compile-time.  We have to call the runtime to resolve the exception.
 917 // So we insert a RethrowCall and all the logic that goes with it.
 918 void Parse::catch_inline_exceptions(SafePointNode* ex_map) {
 919   // Caller is responsible for saving away the map for normal control flow!
 920   assert(stopped(), "call set_map(nullptr) first");
 921   assert(method()->has_exception_handlers(), "don't come here w/o work to do");
 922 
 923   Node* ex_node = saved_ex_oop(ex_map);
 924   if (ex_node == top()) {
 925     // No action needed.
 926     return;
 927   }
 928   const TypeInstPtr* ex_type = _gvn.type(ex_node)->isa_instptr();
 929   NOT_PRODUCT(if (ex_type==nullptr) tty->print_cr("*** Exception not InstPtr"));
 930   if (ex_type == nullptr)
 931     ex_type = TypeOopPtr::make_from_klass(env()->Throwable_klass())->is_instptr();
 932 
 933   // determine potential exception handlers
 934   ciExceptionHandlerStream handlers(method(), bci(),
 935                                     ex_type->instance_klass(),
 936                                     ex_type->klass_is_exact());
 937 
 938   // Start executing from the given throw state.  (Keep its stack, for now.)
 939   // Get the exception oop as known at compile time.
 940   ex_node = use_exception_state(ex_map);
 941 
 942   // Get the exception oop klass from its header
 943   Node* ex_klass_node = nullptr;
 944   if (has_exception_handler() && !ex_type->klass_is_exact()) {
 945     Node* p = basic_plus_adr( ex_node, ex_node, oopDesc::klass_offset_in_bytes());
 946     ex_klass_node = _gvn.transform(LoadKlassNode::make(_gvn, nullptr, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
 947 
 948     // Compute the exception klass a little more cleverly.
 949     // Obvious solution is to simple do a LoadKlass from the 'ex_node'.
 950     // However, if the ex_node is a PhiNode, I'm going to do a LoadKlass for
 951     // each arm of the Phi.  If I know something clever about the exceptions
 952     // I'm loading the class from, I can replace the LoadKlass with the
 953     // klass constant for the exception oop.
 954     if (ex_node->is_Phi()) {
 955       ex_klass_node = new PhiNode(ex_node->in(0), TypeInstKlassPtr::OBJECT);
 956       for (uint i = 1; i < ex_node->req(); i++) {
 957         Node* ex_in = ex_node->in(i);
 958         if (ex_in == top() || ex_in == nullptr) {
 959           // This path was not taken.
 960           ex_klass_node->init_req(i, top());
 961           continue;
 962         }
 963         Node* p = basic_plus_adr(ex_in, ex_in, oopDesc::klass_offset_in_bytes());
 964         Node* k = _gvn.transform( LoadKlassNode::make(_gvn, nullptr, immutable_memory(), p, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
 965         ex_klass_node->init_req( i, k );
 966       }
 967       ex_klass_node = _gvn.transform(ex_klass_node);
 968     }
 969   }
 970 
 971   // Scan the exception table for applicable handlers.
 972   // If none, we can call rethrow() and be done!
 973   // If precise (loaded with no subklasses), insert a D.S. style
 974   // pointer compare to the correct handler and loop back.
 975   // If imprecise, switch to the Rethrow VM-call style handling.
 976 
 977   int remaining = handlers.count_remaining();
 978 
 979   // iterate through all entries sequentially
 980   for (;!handlers.is_done(); handlers.next()) {
 981     ciExceptionHandler* handler = handlers.handler();
 982 
 983     if (handler->is_rethrow()) {
 984       // If we fell off the end of the table without finding an imprecise
 985       // exception klass (and without finding a generic handler) then we
 986       // know this exception is not handled in this method.  We just rethrow
 987       // the exception into the caller.
 988       throw_to_exit(make_exception_state(ex_node));
 989       return;
 990     }
 991 
 992     // exception handler bci range covers throw_bci => investigate further
 993     int handler_bci = handler->handler_bci();
 994 
 995     if (remaining == 1) {
 996       push_ex_oop(ex_node);        // Push exception oop for handler
 997       if (PrintOpto && WizardMode) {
 998         tty->print_cr("  Catching every inline exception bci:%d -> handler_bci:%d", bci(), handler_bci);
 999       }
1000       // If this is a backwards branch in the bytecodes, add safepoint
1001       maybe_add_safepoint(handler_bci);
1002       merge_exception(handler_bci); // jump to handler
1003       return;                   // No more handling to be done here!
1004     }
1005 
1006     // Get the handler's klass
1007     ciInstanceKlass* klass = handler->catch_klass();
1008 
1009     if (!klass->is_loaded()) {  // klass is not loaded?
1010       // fall through into catch_call_exceptions which will emit a
1011       // handler with an uncommon trap.
1012       break;
1013     }
1014 
1015     if (klass->is_interface())  // should not happen, but...
1016       break;                    // bail out
1017 
1018     // Check the type of the exception against the catch type
1019     const TypeKlassPtr *tk = TypeKlassPtr::make(klass);
1020     Node* con = _gvn.makecon(tk);
1021     Node* not_subtype_ctrl = gen_subtype_check(ex_klass_node, con);
1022     if (!stopped()) {
1023       PreserveJVMState pjvms(this);
1024       const TypeInstPtr* tinst = TypeOopPtr::make_from_klass_unique(klass)->cast_to_ptr_type(TypePtr::NotNull)->is_instptr();
1025       assert(klass->has_subklass() || tinst->klass_is_exact(), "lost exactness");
1026       Node* ex_oop = _gvn.transform(new CheckCastPPNode(control(), ex_node, tinst));
1027       push_ex_oop(ex_oop);      // Push exception oop for handler
1028       if (PrintOpto && WizardMode) {
1029         tty->print("  Catching inline exception bci:%d -> handler_bci:%d -- ", bci(), handler_bci);
1030         klass->print_name();
1031         tty->cr();
1032       }
1033       // If this is a backwards branch in the bytecodes, add safepoint
1034       maybe_add_safepoint(handler_bci);
1035       merge_exception(handler_bci);
1036     }
1037     set_control(not_subtype_ctrl);
1038 
1039     // Come here if exception does not match handler.
1040     // Carry on with more handler checks.
1041     --remaining;
1042   }
1043 
1044   assert(!stopped(), "you should return if you finish the chain");
1045 
1046   // Oops, need to call into the VM to resolve the klasses at runtime.
1047   // Note:  This call must not deoptimize, since it is not a real at this bci!
1048   kill_dead_locals();
1049 
1050   make_runtime_call(RC_NO_LEAF | RC_MUST_THROW,
1051                     OptoRuntime::rethrow_Type(),
1052                     OptoRuntime::rethrow_stub(),
1053                     nullptr, nullptr,
1054                     ex_node);
1055 
1056   // Rethrow is a pure call, no side effects, only a result.
1057   // The result cannot be allocated, so we use I_O
1058 
1059   // Catch exceptions from the rethrow
1060   catch_call_exceptions(handlers);
1061 }
1062 
1063 
1064 // (Note:  Moved add_debug_info into GraphKit::add_safepoint_edges.)
1065 
1066 
1067 #ifndef PRODUCT
1068 void Parse::count_compiled_calls(bool at_method_entry, bool is_inline) {
1069   if( CountCompiledCalls ) {
1070     if( at_method_entry ) {
1071       // bump invocation counter if top method (for statistics)
1072       if (CountCompiledCalls && depth() == 1) {
1073         const TypePtr* addr_type = TypeMetadataPtr::make(method());
1074         Node* adr1 = makecon(addr_type);
1075         Node* adr2 = basic_plus_adr(adr1, adr1, in_bytes(Method::compiled_invocation_counter_offset()));
1076         increment_counter(adr2);
1077       }
1078     } else if (is_inline) {
1079       switch (bc()) {
1080       case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_inlined_calls_addr()); break;
1081       case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_inlined_interface_calls_addr()); break;
1082       case Bytecodes::_invokestatic:
1083       case Bytecodes::_invokedynamic:
1084       case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_inlined_static_calls_addr()); break;
1085       default: fatal("unexpected call bytecode");
1086       }
1087     } else {
1088       switch (bc()) {
1089       case Bytecodes::_invokevirtual:   increment_counter(SharedRuntime::nof_normal_calls_addr()); break;
1090       case Bytecodes::_invokeinterface: increment_counter(SharedRuntime::nof_interface_calls_addr()); break;
1091       case Bytecodes::_invokestatic:
1092       case Bytecodes::_invokedynamic:
1093       case Bytecodes::_invokespecial:   increment_counter(SharedRuntime::nof_static_calls_addr()); break;
1094       default: fatal("unexpected call bytecode");
1095       }
1096     }
1097   }
1098 }
1099 #endif //PRODUCT
1100 
1101 
1102 ciMethod* Compile::optimize_virtual_call(ciMethod* caller, ciInstanceKlass* klass,
1103                                          ciKlass* holder, ciMethod* callee,
1104                                          const TypeOopPtr* receiver_type, bool is_virtual,
1105                                          bool& call_does_dispatch, int& vtable_index,
1106                                          bool check_access) {
1107   // Set default values for out-parameters.
1108   call_does_dispatch = true;
1109   vtable_index       = Method::invalid_vtable_index;
1110 
1111   // Choose call strategy.
1112   ciMethod* optimized_virtual_method = optimize_inlining(caller, klass, holder, callee,
1113                                                          receiver_type, check_access);
1114 
1115   // Have the call been sufficiently improved such that it is no longer a virtual?
1116   if (optimized_virtual_method != nullptr) {
1117     callee             = optimized_virtual_method;
1118     call_does_dispatch = false;
1119   } else if (!UseInlineCaches && is_virtual && callee->is_loaded()) {
1120     // We can make a vtable call at this site
1121     vtable_index = callee->resolve_vtable_index(caller->holder(), holder);
1122   }
1123   return callee;
1124 }
1125 
1126 // Identify possible target method and inlining style
1127 ciMethod* Compile::optimize_inlining(ciMethod* caller, ciInstanceKlass* klass, ciKlass* holder,
1128                                      ciMethod* callee, const TypeOopPtr* receiver_type,
1129                                      bool check_access) {
1130   // only use for virtual or interface calls
1131 
1132   // If it is obviously final, do not bother to call find_monomorphic_target,
1133   // because the class hierarchy checks are not needed, and may fail due to
1134   // incompletely loaded classes.  Since we do our own class loading checks
1135   // in this module, we may confidently bind to any method.
1136   if (callee->can_be_statically_bound()) {
1137     return callee;
1138   }
1139 
1140   if (receiver_type == nullptr) {
1141     return nullptr; // no receiver type info
1142   }
1143 
1144   // Attempt to improve the receiver
1145   bool actual_receiver_is_exact = false;
1146   ciInstanceKlass* actual_receiver = klass;
1147   // Array methods are all inherited from Object, and are monomorphic.
1148   // finalize() call on array is not allowed.
1149   if (receiver_type->isa_aryptr() &&
1150       callee->holder() == env()->Object_klass() &&
1151       callee->name() != ciSymbols::finalize_method_name()) {
1152     return callee;
1153   }
1154 
1155   // All other interesting cases are instance klasses.
1156   if (!receiver_type->isa_instptr()) {
1157     return nullptr;
1158   }
1159 
1160   ciInstanceKlass* receiver_klass = receiver_type->is_instptr()->instance_klass();
1161   if (receiver_klass->is_loaded() && receiver_klass->is_initialized() && !receiver_klass->is_interface() &&
1162       (receiver_klass == actual_receiver || receiver_klass->is_subtype_of(actual_receiver))) {
1163     // ikl is a same or better type than the original actual_receiver,
1164     // e.g. static receiver from bytecodes.
1165     actual_receiver = receiver_klass;
1166     // Is the actual_receiver exact?
1167     actual_receiver_is_exact = receiver_type->klass_is_exact();
1168   }
1169 
1170   ciInstanceKlass*   calling_klass = caller->holder();
1171   ciMethod* cha_monomorphic_target = callee->find_monomorphic_target(calling_klass, klass, actual_receiver, check_access);
1172 
1173   if (cha_monomorphic_target != nullptr) {
1174     // Hardwiring a virtual.
1175     assert(!callee->can_be_statically_bound(), "should have been handled earlier");
1176     assert(!cha_monomorphic_target->is_abstract(), "");
1177     if (!cha_monomorphic_target->can_be_statically_bound(actual_receiver)) {
1178       // If we inlined because CHA revealed only a single target method,
1179       // then we are dependent on that target method not getting overridden
1180       // by dynamic class loading.  Be sure to test the "static" receiver
1181       // dest_method here, as opposed to the actual receiver, which may
1182       // falsely lead us to believe that the receiver is final or private.
1183       dependencies()->assert_unique_concrete_method(actual_receiver, cha_monomorphic_target, holder, callee);
1184     }
1185     return cha_monomorphic_target;
1186   }
1187 
1188   // If the type is exact, we can still bind the method w/o a vcall.
1189   // (This case comes after CHA so we can see how much extra work it does.)
1190   if (actual_receiver_is_exact) {
1191     // In case of evolution, there is a dependence on every inlined method, since each
1192     // such method can be changed when its class is redefined.
1193     ciMethod* exact_method = callee->resolve_invoke(calling_klass, actual_receiver);
1194     if (exact_method != nullptr) {
1195       return exact_method;
1196     }
1197   }
1198 
1199   return nullptr;
1200 }