1 /*
   2  * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "compiler/compileBroker.hpp"
  29 #include "compiler/compileLog.hpp"
  30 #include "interpreter/linkResolver.hpp"
  31 #include "oops/objArrayKlass.hpp"
  32 #include "opto/callGenerator.hpp"
  33 #include "opto/parse.hpp"
  34 #include "runtime/handles.inline.hpp"
  35 
  36 //=============================================================================
  37 //------------------------------InlineTree-------------------------------------
  38 InlineTree::InlineTree(Compile* c,
  39                        const InlineTree *caller_tree, ciMethod* callee,
  40                        JVMState* caller_jvms, int caller_bci,
  41                        float site_invoke_ratio, int max_inline_level) :
  42   C(c),
  43   _caller_jvms(caller_jvms),
  44   _caller_tree((InlineTree*) caller_tree),
  45   _method(callee),
  46   _site_invoke_ratio(site_invoke_ratio),
  47   _max_inline_level(max_inline_level),
  48   _count_inline_bcs(method()->code_size_for_inlining())
  49 {
  50   NOT_PRODUCT(_count_inlines = 0;)
  51   if (_caller_jvms != NULL) {
  52     // Keep a private copy of the caller_jvms:
  53     _caller_jvms = new (C) JVMState(caller_jvms->method(), caller_tree->caller_jvms());
  54     _caller_jvms->set_bci(caller_jvms->bci());
  55     assert(!caller_jvms->should_reexecute(), "there should be no reexecute bytecode with inlining");
  56   }
  57   assert(_caller_jvms->same_calls_as(caller_jvms), "consistent JVMS");
  58   assert((caller_tree == NULL ? 0 : caller_tree->stack_depth() + 1) == stack_depth(), "correct (redundant) depth parameter");
  59   assert(caller_bci == this->caller_bci(), "correct (redundant) bci parameter");
  60   if (UseOldInlining) {
  61     // Update hierarchical counts, count_inline_bcs() and count_inlines()
  62     InlineTree *caller = (InlineTree *)caller_tree;
  63     for( ; caller != NULL; caller = ((InlineTree *)(caller->caller_tree())) ) {
  64       caller->_count_inline_bcs += count_inline_bcs();
  65       NOT_PRODUCT(caller->_count_inlines++;)
  66     }
  67   }
  68 }
  69 
  70 InlineTree::InlineTree(Compile* c, ciMethod* callee_method, JVMState* caller_jvms,
  71                        float site_invoke_ratio, int max_inline_level) :
  72   C(c),
  73   _caller_jvms(caller_jvms),
  74   _caller_tree(NULL),
  75   _method(callee_method),
  76   _site_invoke_ratio(site_invoke_ratio),
  77   _max_inline_level(max_inline_level),
  78   _count_inline_bcs(method()->code_size())
  79 {
  80   NOT_PRODUCT(_count_inlines = 0;)
  81   assert(!UseOldInlining, "do not use for old stuff");
  82 }
  83 
  84 static bool is_init_with_ea(ciMethod* callee_method,
  85                             ciMethod* caller_method, Compile* C) {
  86   // True when EA is ON and a java constructor is called or
  87   // a super constructor is called from an inlined java constructor.
  88   return C->do_escape_analysis() && EliminateAllocations &&
  89          ( callee_method->is_initializer() ||
  90            (caller_method->is_initializer() &&
  91             caller_method != C->method() &&
  92             caller_method->holder()->is_subclass_of(callee_method->holder()))
  93          );
  94 }
  95 
  96 // positive filter: should send be inlined?  returns NULL, if yes, or rejection msg
  97 const char* InlineTree::should_inline(ciMethod* callee_method, ciMethod* caller_method, int caller_bci, ciCallProfile& profile, WarmCallInfo* wci_result) const {
  98   // Allows targeted inlining
  99   if(callee_method->should_inline()) {
 100     *wci_result = *(WarmCallInfo::always_hot());
 101     if (PrintInlining && Verbose) {
 102       CompileTask::print_inline_indent(inline_level());
 103       tty->print_cr("Inlined method is hot: ");
 104     }
 105     return NULL;
 106   }
 107 
 108   // positive filter: should send be inlined?  returns NULL (--> yes)
 109   // or rejection msg
 110   int size = callee_method->code_size_for_inlining();
 111 
 112   // Check for too many throws (and not too huge)
 113   if(callee_method->interpreter_throwout_count() > InlineThrowCount &&
 114      size < InlineThrowMaxSize ) {
 115     wci_result->set_profit(wci_result->profit() * 100);
 116     if (PrintInlining && Verbose) {
 117       CompileTask::print_inline_indent(inline_level());
 118       tty->print_cr("Inlined method with many throws (throws=%d):", callee_method->interpreter_throwout_count());
 119     }
 120     return NULL;
 121   }
 122 
 123   if (!UseOldInlining) {
 124     return NULL;  // size and frequency are represented in a new way
 125   }
 126 
 127   int default_max_inline_size = C->max_inline_size();
 128   int inline_small_code_size  = InlineSmallCode / 4;
 129   int max_inline_size         = default_max_inline_size;
 130 
 131   int call_site_count  = method()->scale_count(profile.count());
 132   int invoke_count     = method()->interpreter_invocation_count();
 133 
 134   // Bytecoded method handle adapters do not have interpreter
 135   // profiling data but only made up MDO data.  Get the counter from
 136   // there.
 137   if (caller_method->is_method_handle_adapter()) {
 138     assert(method()->method_data_or_null(), "must have an MDO");
 139     ciMethodData* mdo = method()->method_data();
 140     ciProfileData* mha_profile = mdo->bci_to_data(caller_bci);
 141     assert(mha_profile, "must exist");
 142     CounterData* cd = mha_profile->as_CounterData();
 143     invoke_count = cd->count();
 144     if (invoke_count == 0) {
 145       return "method handle not reached";
 146     }
 147 
 148     if (_caller_jvms != NULL && _caller_jvms->method() != NULL &&
 149         _caller_jvms->method()->method_data() != NULL &&
 150         !_caller_jvms->method()->method_data()->is_empty()) {
 151       ciMethodData* mdo = _caller_jvms->method()->method_data();
 152       ciProfileData* mha_profile = mdo->bci_to_data(_caller_jvms->bci());
 153       assert(mha_profile, "must exist");
 154       CounterData* cd = mha_profile->as_CounterData();
 155       call_site_count = cd->count();
 156     } else {
 157       call_site_count = invoke_count;  // use the same value
 158     }
 159   }
 160 
 161   assert(invoke_count != 0, "require invocation count greater than zero");
 162   int freq = call_site_count / invoke_count;
 163 
 164   // bump the max size if the call is frequent
 165   if ((freq >= InlineFrequencyRatio) ||
 166       (call_site_count >= InlineFrequencyCount) ||
 167       is_init_with_ea(callee_method, caller_method, C)) {
 168 
 169     max_inline_size = C->freq_inline_size();
 170     if (size <= max_inline_size && TraceFrequencyInlining) {
 171       CompileTask::print_inline_indent(inline_level());
 172       tty->print_cr("Inlined frequent method (freq=%d count=%d):", freq, call_site_count);
 173       CompileTask::print_inline_indent(inline_level());
 174       callee_method->print();
 175       tty->cr();
 176     }
 177   } else {
 178     // Not hot.  Check for medium-sized pre-existing nmethod at cold sites.
 179     if (callee_method->has_compiled_code() &&
 180         callee_method->instructions_size(CompLevel_full_optimization) > inline_small_code_size)
 181       return "already compiled into a medium method";
 182   }
 183   if (size > max_inline_size) {
 184     if (max_inline_size > default_max_inline_size)
 185       return "hot method too big";
 186     return "too big";
 187   }
 188   return NULL;
 189 }
 190 
 191 
 192 // negative filter: should send NOT be inlined?  returns NULL, ok to inline, or rejection msg
 193 const char* InlineTree::should_not_inline(ciMethod *callee_method, ciMethod* caller_method, WarmCallInfo* wci_result) const {
 194   // negative filter: should send NOT be inlined?  returns NULL (--> inline) or rejection msg
 195   if (!UseOldInlining) {
 196     const char* fail = NULL;
 197     if (callee_method->is_abstract())               fail = "abstract method";
 198     // note: we allow ik->is_abstract()
 199     if (!callee_method->holder()->is_initialized()) fail = "method holder not initialized";
 200     if (callee_method->is_native())                 fail = "native method";
 201 
 202     if (fail) {
 203       *wci_result = *(WarmCallInfo::always_cold());
 204       return fail;
 205     }
 206 
 207     if (callee_method->has_unloaded_classes_in_signature()) {
 208       wci_result->set_profit(wci_result->profit() * 0.1);
 209     }
 210 
 211     // don't inline exception code unless the top method belongs to an
 212     // exception class
 213     if (callee_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
 214       ciMethod* top_method = caller_jvms() ? caller_jvms()->of_depth(1)->method() : method();
 215       if (!top_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
 216         wci_result->set_profit(wci_result->profit() * 0.1);
 217       }
 218     }
 219 
 220     if (callee_method->has_compiled_code() && callee_method->instructions_size(CompLevel_full_optimization) > InlineSmallCode) {
 221       wci_result->set_profit(wci_result->profit() * 0.1);
 222       // %%% adjust wci_result->size()?
 223     }
 224 
 225     return NULL;
 226   }
 227 
 228   // Always inline MethodHandle methods and generated MethodHandle adapters.
 229   if (callee_method->is_method_handle_invoke() || callee_method->is_method_handle_adapter())
 230     return NULL;
 231 
 232   // First check all inlining restrictions which are required for correctness
 233   if (callee_method->is_abstract())               return "abstract method";
 234   // note: we allow ik->is_abstract()
 235   if (!callee_method->holder()->is_initialized()) return "method holder not initialized";
 236   if (callee_method->is_native())                 return "native method";
 237   if (callee_method->has_unloaded_classes_in_signature()) return "unloaded signature classes";
 238 
 239   if (callee_method->should_inline()) {
 240     // ignore heuristic controls on inlining
 241     return NULL;
 242   }
 243 
 244   // Now perform checks which are heuristic
 245 
 246   if( callee_method->has_compiled_code() && callee_method->instructions_size(CompLevel_full_optimization) > InlineSmallCode )
 247     return "already compiled into a big method";
 248 
 249   // don't inline exception code unless the top method belongs to an
 250   // exception class
 251   if (caller_tree() != NULL &&
 252       callee_method->holder()->is_subclass_of(C->env()->Throwable_klass())) {
 253     const InlineTree *top = this;
 254     while (top->caller_tree() != NULL) top = top->caller_tree();
 255     ciInstanceKlass* k = top->method()->holder();
 256     if (!k->is_subclass_of(C->env()->Throwable_klass()))
 257       return "exception method";
 258   }
 259 
 260   // use frequency-based objections only for non-trivial methods
 261   if (callee_method->code_size_for_inlining() <= MaxTrivialSize) return NULL;
 262 
 263   // don't use counts with -Xcomp or CTW
 264   if (UseInterpreter && !CompileTheWorld) {
 265 
 266     if (!callee_method->has_compiled_code() &&
 267         !callee_method->was_executed_more_than(0)) {
 268       return "never executed";
 269     }
 270 
 271     if (is_init_with_ea(callee_method, caller_method, C)) {
 272 
 273       // Escape Analysis: inline all executed constructors
 274 
 275     } else if (!callee_method->was_executed_more_than(MIN2(MinInliningThreshold,
 276                                                            CompileThreshold >> 1))) {
 277       return "executed < MinInliningThreshold times";
 278     }
 279   }
 280 
 281   if (callee_method->should_not_inline()) {
 282     return "disallowed by CompilerOracle";
 283   }
 284 
 285   if (UseStringCache) {
 286     // Do not inline StringCache::profile() method used only at the beginning.
 287     if (callee_method->name() == ciSymbol::profile_name() &&
 288         callee_method->holder()->name() == ciSymbol::java_lang_StringCache()) {
 289       return "profiling method";
 290     }
 291   }
 292 
 293   return NULL;
 294 }
 295 
 296 //-----------------------------try_to_inline-----------------------------------
 297 // return NULL if ok, reason for not inlining otherwise
 298 // Relocated from "InliningClosure::try_to_inline"
 299 const char* InlineTree::try_to_inline(ciMethod* callee_method, ciMethod* caller_method, int caller_bci, ciCallProfile& profile, WarmCallInfo* wci_result) {
 300 
 301   // Old algorithm had funny accumulating BC-size counters
 302   if (UseOldInlining && ClipInlining
 303       && (int)count_inline_bcs() >= DesiredMethodLimit) {
 304     return "size > DesiredMethodLimit";
 305   }
 306 
 307   const char *msg = NULL;
 308   msg = should_inline(callee_method, caller_method, caller_bci, profile, wci_result);
 309   if (msg != NULL)
 310     return msg;
 311 
 312   msg = should_not_inline(callee_method, caller_method, wci_result);
 313   if (msg != NULL)
 314     return msg;
 315 
 316   if (InlineAccessors && callee_method->is_accessor()) {
 317     // accessor methods are not subject to any of the following limits.
 318     return NULL;
 319   }
 320 
 321   // suppress a few checks for accessors and trivial methods
 322   if (callee_method->code_size_for_inlining() > MaxTrivialSize) {
 323 
 324     // don't inline into giant methods
 325     if (C->unique() > (uint)NodeCountInliningCutoff) {
 326       return "NodeCountInliningCutoff";
 327     }
 328 
 329     if ((!UseInterpreter || CompileTheWorld) &&
 330         is_init_with_ea(callee_method, caller_method, C)) {
 331 
 332       // Escape Analysis stress testing when running Xcomp or CTW:
 333       // inline constructors even if they are not reached.
 334 
 335     } else if (profile.count() == 0) {
 336       // don't inline unreached call sites
 337       return "call site not reached";
 338     }
 339   }
 340 
 341   if (!C->do_inlining() && InlineAccessors) {
 342     return "not an accessor";
 343   }
 344   if (inline_level() > _max_inline_level) {
 345     return "inlining too deep";
 346   }
 347 
 348   // detect direct and indirect recursive inlining
 349   {
 350     // count the current method and the callee
 351     int inline_level = (method() == callee_method) ? 1 : 0;
 352     if (inline_level > MaxRecursiveInlineLevel)
 353       return "recursively inlining too deep";
 354     // count callers of current method and callee
 355     JVMState* jvms = caller_jvms();
 356     while (jvms != NULL && jvms->has_method()) {
 357       if (jvms->method() == callee_method) {
 358         inline_level++;
 359         if (inline_level > MaxRecursiveInlineLevel)
 360           return "recursively inlining too deep";
 361       }
 362       jvms = jvms->caller();
 363     }
 364   }
 365 
 366   int size = callee_method->code_size_for_inlining();
 367 
 368   if (UseOldInlining && ClipInlining
 369       && (int)count_inline_bcs() + size >= DesiredMethodLimit) {
 370     return "size > DesiredMethodLimit";
 371   }
 372 
 373   // ok, inline this method
 374   return NULL;
 375 }
 376 
 377 //------------------------------pass_initial_checks----------------------------
 378 bool pass_initial_checks(ciMethod* caller_method, int caller_bci, ciMethod* callee_method) {
 379   ciInstanceKlass *callee_holder = callee_method ? callee_method->holder() : NULL;
 380   // Check if a callee_method was suggested
 381   if( callee_method == NULL )            return false;
 382   // Check if klass of callee_method is loaded
 383   if( !callee_holder->is_loaded() )      return false;
 384   if( !callee_holder->is_initialized() ) return false;
 385   if( !UseInterpreter || CompileTheWorld /* running Xcomp or CTW */ ) {
 386     // Checks that constant pool's call site has been visited
 387     // stricter than callee_holder->is_initialized()
 388     ciBytecodeStream iter(caller_method);
 389     iter.force_bci(caller_bci);
 390     Bytecodes::Code call_bc = iter.cur_bc();
 391     // An invokedynamic instruction does not have a klass.
 392     if (call_bc != Bytecodes::_invokedynamic) {
 393       int index = iter.get_index_u2_cpcache();
 394       if (!caller_method->is_klass_loaded(index, true)) {
 395         return false;
 396       }
 397       // Try to do constant pool resolution if running Xcomp
 398       if( !caller_method->check_call(index, call_bc == Bytecodes::_invokestatic) ) {
 399         return false;
 400       }
 401     }
 402   }
 403   // We will attempt to see if a class/field/etc got properly loaded.  If it
 404   // did not, it may attempt to throw an exception during our probing.  Catch
 405   // and ignore such exceptions and do not attempt to compile the method.
 406   if( callee_method->should_exclude() )  return false;
 407 
 408   return true;
 409 }
 410 
 411 //------------------------------check_can_parse--------------------------------
 412 const char* InlineTree::check_can_parse(ciMethod* callee) {
 413   // Certain methods cannot be parsed at all:
 414   if ( callee->is_native())                     return "native method";
 415   if (!callee->can_be_compiled())               return "not compilable (disabled)";
 416   if (!callee->has_balanced_monitors())         return "not compilable (unbalanced monitors)";
 417   if ( callee->get_flow_analysis()->failing())  return "not compilable (flow analysis failed)";
 418   return NULL;
 419 }
 420 
 421 //------------------------------print_inlining---------------------------------
 422 // Really, the failure_msg can be a success message also.
 423 void InlineTree::print_inlining(ciMethod* callee_method, int caller_bci, const char* failure_msg) const {
 424   CompileTask::print_inlining(callee_method, inline_level(), caller_bci, failure_msg ? failure_msg : "inline");
 425   if (callee_method == NULL)  tty->print(" callee not monotonic or profiled");
 426   if (Verbose && callee_method) {
 427     const InlineTree *top = this;
 428     while( top->caller_tree() != NULL ) { top = top->caller_tree(); }
 429     tty->print("  bcs: %d+%d  invoked: %d", top->count_inline_bcs(), callee_method->code_size(), callee_method->interpreter_invocation_count());
 430   }
 431 }
 432 
 433 //------------------------------ok_to_inline-----------------------------------
 434 WarmCallInfo* InlineTree::ok_to_inline(ciMethod* callee_method, JVMState* jvms, ciCallProfile& profile, WarmCallInfo* initial_wci) {
 435   assert(callee_method != NULL, "caller checks for optimized virtual!");
 436 #ifdef ASSERT
 437   // Make sure the incoming jvms has the same information content as me.
 438   // This means that we can eventually make this whole class AllStatic.
 439   if (jvms->caller() == NULL) {
 440     assert(_caller_jvms == NULL, "redundant instance state");
 441   } else {
 442     assert(_caller_jvms->same_calls_as(jvms->caller()), "redundant instance state");
 443   }
 444   assert(_method == jvms->method(), "redundant instance state");
 445 #endif
 446   const char *failure_msg   = NULL;
 447   int         caller_bci    = jvms->bci();
 448   ciMethod   *caller_method = jvms->method();
 449 
 450   // Do some initial checks.
 451   if (!pass_initial_checks(caller_method, caller_bci, callee_method)) {
 452     if (PrintInlining) {
 453       failure_msg = "failed_initial_checks";
 454       print_inlining(callee_method, caller_bci, failure_msg);
 455     }
 456     return NULL;
 457   }
 458 
 459   // Do some parse checks.
 460   failure_msg = check_can_parse(callee_method);
 461   if (failure_msg != NULL) {
 462     if (PrintInlining)  print_inlining(callee_method, caller_bci, failure_msg);
 463     return NULL;
 464   }
 465 
 466   // Check if inlining policy says no.
 467   WarmCallInfo wci = *(initial_wci);
 468   failure_msg = try_to_inline(callee_method, caller_method, caller_bci, profile, &wci);
 469   if (failure_msg != NULL && C->log() != NULL) {
 470     C->log()->begin_elem("inline_fail reason='");
 471     C->log()->text("%s", failure_msg);
 472     C->log()->end_elem("'");
 473   }
 474 
 475 #ifndef PRODUCT
 476   if (UseOldInlining && InlineWarmCalls
 477       && (PrintOpto || PrintOptoInlining || PrintInlining)) {
 478     bool cold = wci.is_cold();
 479     bool hot  = !cold && wci.is_hot();
 480     bool old_cold = (failure_msg != NULL);
 481     if (old_cold != cold || (Verbose || WizardMode)) {
 482       tty->print("   OldInlining= %4s : %s\n           WCI=",
 483                  old_cold ? "cold" : "hot", failure_msg ? failure_msg : "OK");
 484       wci.print();
 485     }
 486   }
 487 #endif
 488   if (UseOldInlining) {
 489     if (failure_msg == NULL)
 490       wci = *(WarmCallInfo::always_hot());
 491     else
 492       wci = *(WarmCallInfo::always_cold());
 493   }
 494   if (!InlineWarmCalls) {
 495     if (!wci.is_cold() && !wci.is_hot()) {
 496       // Do not inline the warm calls.
 497       wci = *(WarmCallInfo::always_cold());
 498     }
 499   }
 500 
 501   if (!wci.is_cold()) {
 502     // In -UseOldInlining, the failure_msg may also be a success message.
 503     if (failure_msg == NULL)  failure_msg = "inline (hot)";
 504 
 505     // Inline!
 506     if (PrintInlining)  print_inlining(callee_method, caller_bci, failure_msg);
 507     if (UseOldInlining)
 508       build_inline_tree_for_callee(callee_method, jvms, caller_bci);
 509     if (InlineWarmCalls && !wci.is_hot())
 510       return new (C) WarmCallInfo(wci);  // copy to heap
 511     return WarmCallInfo::always_hot();
 512   }
 513 
 514   // Do not inline
 515   if (failure_msg == NULL)  failure_msg = "too cold to inline";
 516   if (PrintInlining)  print_inlining(callee_method, caller_bci, failure_msg);
 517   return NULL;
 518 }
 519 
 520 //------------------------------compute_callee_frequency-----------------------
 521 float InlineTree::compute_callee_frequency( int caller_bci ) const {
 522   int count  = method()->interpreter_call_site_count(caller_bci);
 523   int invcnt = method()->interpreter_invocation_count();
 524   float freq = (float)count/(float)invcnt;
 525   // Call-site count / interpreter invocation count, scaled recursively.
 526   // Always between 0.0 and 1.0.  Represents the percentage of the method's
 527   // total execution time used at this call site.
 528 
 529   return freq;
 530 }
 531 
 532 //------------------------------build_inline_tree_for_callee-------------------
 533 InlineTree *InlineTree::build_inline_tree_for_callee( ciMethod* callee_method, JVMState* caller_jvms, int caller_bci) {
 534   float recur_frequency = _site_invoke_ratio * compute_callee_frequency(caller_bci);
 535   // Attempt inlining.
 536   InlineTree* old_ilt = callee_at(caller_bci, callee_method);
 537   if (old_ilt != NULL) {
 538     return old_ilt;
 539   }
 540   int max_inline_level_adjust = 0;
 541   if (caller_jvms->method() != NULL) {
 542     if (caller_jvms->method()->is_method_handle_adapter())
 543       max_inline_level_adjust += 1;  // don't count actions in MH or indy adapter frames
 544     else if (callee_method->is_method_handle_invoke()) {
 545       max_inline_level_adjust += 1;  // don't count method handle calls from java.lang.invoke implem
 546     }
 547     if (max_inline_level_adjust != 0 && PrintInlining && (Verbose || WizardMode)) {
 548       CompileTask::print_inline_indent(inline_level());
 549       tty->print_cr(" \\-> discounting inline depth");
 550     }
 551     if (max_inline_level_adjust != 0 && C->log()) {
 552       int id1 = C->log()->identify(caller_jvms->method());
 553       int id2 = C->log()->identify(callee_method);
 554       C->log()->elem("inline_level_discount caller='%d' callee='%d'", id1, id2);
 555     }
 556   }
 557   InlineTree* ilt = new InlineTree(C, this, callee_method, caller_jvms, caller_bci, recur_frequency, _max_inline_level + max_inline_level_adjust);
 558   _subtrees.append(ilt);
 559 
 560   NOT_PRODUCT( _count_inlines += 1; )
 561 
 562   return ilt;
 563 }
 564 
 565 
 566 //---------------------------------------callee_at-----------------------------
 567 InlineTree *InlineTree::callee_at(int bci, ciMethod* callee) const {
 568   for (int i = 0; i < _subtrees.length(); i++) {
 569     InlineTree* sub = _subtrees.at(i);
 570     if (sub->caller_bci() == bci && callee == sub->method()) {
 571       return sub;
 572     }
 573   }
 574   return NULL;
 575 }
 576 
 577 
 578 //------------------------------build_inline_tree_root-------------------------
 579 InlineTree *InlineTree::build_inline_tree_root() {
 580   Compile* C = Compile::current();
 581 
 582   // Root of inline tree
 583   InlineTree* ilt = new InlineTree(C, NULL, C->method(), NULL, -1, 1.0F, MaxInlineLevel);
 584 
 585   return ilt;
 586 }
 587 
 588 
 589 //-------------------------find_subtree_from_root-----------------------------
 590 // Given a jvms, which determines a call chain from the root method,
 591 // find the corresponding inline tree.
 592 // Note: This method will be removed or replaced as InlineTree goes away.
 593 InlineTree* InlineTree::find_subtree_from_root(InlineTree* root, JVMState* jvms, ciMethod* callee, bool create_if_not_found) {
 594   InlineTree* iltp = root;
 595   uint depth = jvms && jvms->has_method() ? jvms->depth() : 0;
 596   for (uint d = 1; d <= depth; d++) {
 597     JVMState* jvmsp  = jvms->of_depth(d);
 598     // Select the corresponding subtree for this bci.
 599     assert(jvmsp->method() == iltp->method(), "tree still in sync");
 600     ciMethod* d_callee = (d == depth) ? callee : jvms->of_depth(d+1)->method();
 601     InlineTree* sub = iltp->callee_at(jvmsp->bci(), d_callee);
 602     if (!sub) {
 603       if (create_if_not_found && d == depth) {
 604         return iltp->build_inline_tree_for_callee(d_callee, jvmsp, jvmsp->bci());
 605       }
 606       assert(sub != NULL, "should be a sub-ilt here");
 607       return NULL;
 608     }
 609     iltp = sub;
 610   }
 611   return iltp;
 612 }
 613 
 614 
 615 
 616 #ifndef PRODUCT
 617 void InlineTree::print_impl(outputStream* st, int indent) const {
 618   for (int i = 0; i < indent; i++) st->print(" ");
 619   st->print(" @ %d ", caller_bci());
 620   method()->print_short_name(st);
 621   st->cr();
 622 
 623   for (int i = 0 ; i < _subtrees.length(); i++) {
 624     _subtrees.at(i)->print_impl(st, indent + 2);
 625   }
 626 }
 627 
 628 void InlineTree::print_value_on(outputStream* st) const {
 629   print_impl(st, 2);
 630 }
 631 #endif