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 }