1 /* 2 * Copyright (c) 2001, 2018, 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/ciUtilities.hpp" 27 #include "compiler/compileLog.hpp" 28 #include "ci/ciValueKlass.hpp" 29 #include "gc/shared/barrierSet.hpp" 30 #include "gc/shared/c2/barrierSetC2.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "opto/addnode.hpp" 34 #include "opto/castnode.hpp" 35 #include "opto/convertnode.hpp" 36 #include "opto/graphKit.hpp" 37 #include "opto/idealKit.hpp" 38 #include "opto/intrinsicnode.hpp" 39 #include "opto/locknode.hpp" 40 #include "opto/machnode.hpp" 41 #include "opto/narrowptrnode.hpp" 42 #include "opto/opaquenode.hpp" 43 #include "opto/parse.hpp" 44 #include "opto/rootnode.hpp" 45 #include "opto/runtime.hpp" 46 #include "opto/valuetypenode.hpp" 47 #include "runtime/deoptimization.hpp" 48 #include "runtime/sharedRuntime.hpp" 49 50 //----------------------------GraphKit----------------------------------------- 51 // Main utility constructor. 52 GraphKit::GraphKit(JVMState* jvms, PhaseGVN* gvn) 53 : Phase(Phase::Parser), 54 _env(C->env()), 55 _gvn((gvn != NULL) ? *gvn : *C->initial_gvn()), 56 _barrier_set(BarrierSet::barrier_set()->barrier_set_c2()) 57 { 58 assert(gvn == NULL || !gvn->is_IterGVN() || gvn->is_IterGVN()->delay_transform(), "delay transform should be enabled"); 59 _exceptions = jvms->map()->next_exception(); 60 if (_exceptions != NULL) jvms->map()->set_next_exception(NULL); 61 set_jvms(jvms); 62 #ifdef ASSERT 63 if (_gvn.is_IterGVN() != NULL) { 64 assert(_gvn.is_IterGVN()->delay_transform(), "Transformation must be delayed if IterGVN is used"); 65 // Save the initial size of _for_igvn worklist for verification (see ~GraphKit) 66 _worklist_size = _gvn.C->for_igvn()->size(); 67 } 68 #endif 69 } 70 71 // Private constructor for parser. 72 GraphKit::GraphKit() 73 : Phase(Phase::Parser), 74 _env(C->env()), 75 _gvn(*C->initial_gvn()), 76 _barrier_set(BarrierSet::barrier_set()->barrier_set_c2()) 77 { 78 _exceptions = NULL; 79 set_map(NULL); 80 debug_only(_sp = -99); 81 debug_only(set_bci(-99)); 82 } 83 84 85 86 //---------------------------clean_stack--------------------------------------- 87 // Clear away rubbish from the stack area of the JVM state. 88 // This destroys any arguments that may be waiting on the stack. 89 void GraphKit::clean_stack(int from_sp) { 90 SafePointNode* map = this->map(); 91 JVMState* jvms = this->jvms(); 92 int stk_size = jvms->stk_size(); 93 int stkoff = jvms->stkoff(); 94 Node* top = this->top(); 95 for (int i = from_sp; i < stk_size; i++) { 96 if (map->in(stkoff + i) != top) { 97 map->set_req(stkoff + i, top); 98 } 99 } 100 } 101 102 103 //--------------------------------sync_jvms----------------------------------- 104 // Make sure our current jvms agrees with our parse state. 105 JVMState* GraphKit::sync_jvms() const { 106 JVMState* jvms = this->jvms(); 107 jvms->set_bci(bci()); // Record the new bci in the JVMState 108 jvms->set_sp(sp()); // Record the new sp in the JVMState 109 assert(jvms_in_sync(), "jvms is now in sync"); 110 return jvms; 111 } 112 113 //--------------------------------sync_jvms_for_reexecute--------------------- 114 // Make sure our current jvms agrees with our parse state. This version 115 // uses the reexecute_sp for reexecuting bytecodes. 116 JVMState* GraphKit::sync_jvms_for_reexecute() { 117 JVMState* jvms = this->jvms(); 118 jvms->set_bci(bci()); // Record the new bci in the JVMState 119 jvms->set_sp(reexecute_sp()); // Record the new sp in the JVMState 120 return jvms; 121 } 122 123 #ifdef ASSERT 124 bool GraphKit::jvms_in_sync() const { 125 Parse* parse = is_Parse(); 126 if (parse == NULL) { 127 if (bci() != jvms()->bci()) return false; 128 if (sp() != (int)jvms()->sp()) return false; 129 return true; 130 } 131 if (jvms()->method() != parse->method()) return false; 132 if (jvms()->bci() != parse->bci()) return false; 133 int jvms_sp = jvms()->sp(); 134 if (jvms_sp != parse->sp()) return false; 135 int jvms_depth = jvms()->depth(); 136 if (jvms_depth != parse->depth()) return false; 137 return true; 138 } 139 140 // Local helper checks for special internal merge points 141 // used to accumulate and merge exception states. 142 // They are marked by the region's in(0) edge being the map itself. 143 // Such merge points must never "escape" into the parser at large, 144 // until they have been handed to gvn.transform. 145 static bool is_hidden_merge(Node* reg) { 146 if (reg == NULL) return false; 147 if (reg->is_Phi()) { 148 reg = reg->in(0); 149 if (reg == NULL) return false; 150 } 151 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root(); 152 } 153 154 void GraphKit::verify_map() const { 155 if (map() == NULL) return; // null map is OK 156 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map"); 157 assert(!map()->has_exceptions(), "call add_exception_states_from 1st"); 158 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map"); 159 } 160 161 void GraphKit::verify_exception_state(SafePointNode* ex_map) { 162 assert(ex_map->next_exception() == NULL, "not already part of a chain"); 163 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop"); 164 } 165 #endif 166 167 //---------------------------stop_and_kill_map--------------------------------- 168 // Set _map to NULL, signalling a stop to further bytecode execution. 169 // First smash the current map's control to a constant, to mark it dead. 170 void GraphKit::stop_and_kill_map() { 171 SafePointNode* dead_map = stop(); 172 if (dead_map != NULL) { 173 dead_map->disconnect_inputs(NULL, C); // Mark the map as killed. 174 assert(dead_map->is_killed(), "must be so marked"); 175 } 176 } 177 178 179 //--------------------------------stopped-------------------------------------- 180 // Tell if _map is NULL, or control is top. 181 bool GraphKit::stopped() { 182 if (map() == NULL) return true; 183 else if (control() == top()) return true; 184 else return false; 185 } 186 187 188 //-----------------------------has_ex_handler---------------------------------- 189 // Tell if this method or any caller method has exception handlers. 190 bool GraphKit::has_ex_handler() { 191 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) { 192 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) { 193 return true; 194 } 195 } 196 return false; 197 } 198 199 //------------------------------save_ex_oop------------------------------------ 200 // Save an exception without blowing stack contents or other JVM state. 201 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) { 202 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again"); 203 ex_map->add_req(ex_oop); 204 debug_only(verify_exception_state(ex_map)); 205 } 206 207 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) { 208 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there"); 209 Node* ex_oop = ex_map->in(ex_map->req()-1); 210 if (clear_it) ex_map->del_req(ex_map->req()-1); 211 return ex_oop; 212 } 213 214 //-----------------------------saved_ex_oop------------------------------------ 215 // Recover a saved exception from its map. 216 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) { 217 return common_saved_ex_oop(ex_map, false); 218 } 219 220 //--------------------------clear_saved_ex_oop--------------------------------- 221 // Erase a previously saved exception from its map. 222 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) { 223 return common_saved_ex_oop(ex_map, true); 224 } 225 226 #ifdef ASSERT 227 //---------------------------has_saved_ex_oop---------------------------------- 228 // Erase a previously saved exception from its map. 229 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) { 230 return ex_map->req() == ex_map->jvms()->endoff()+1; 231 } 232 #endif 233 234 //-------------------------make_exception_state-------------------------------- 235 // Turn the current JVM state into an exception state, appending the ex_oop. 236 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) { 237 sync_jvms(); 238 SafePointNode* ex_map = stop(); // do not manipulate this map any more 239 set_saved_ex_oop(ex_map, ex_oop); 240 return ex_map; 241 } 242 243 244 //--------------------------add_exception_state-------------------------------- 245 // Add an exception to my list of exceptions. 246 void GraphKit::add_exception_state(SafePointNode* ex_map) { 247 if (ex_map == NULL || ex_map->control() == top()) { 248 return; 249 } 250 #ifdef ASSERT 251 verify_exception_state(ex_map); 252 if (has_exceptions()) { 253 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place"); 254 } 255 #endif 256 257 // If there is already an exception of exactly this type, merge with it. 258 // In particular, null-checks and other low-level exceptions common up here. 259 Node* ex_oop = saved_ex_oop(ex_map); 260 const Type* ex_type = _gvn.type(ex_oop); 261 if (ex_oop == top()) { 262 // No action needed. 263 return; 264 } 265 assert(ex_type->isa_instptr(), "exception must be an instance"); 266 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) { 267 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2)); 268 // We check sp also because call bytecodes can generate exceptions 269 // both before and after arguments are popped! 270 if (ex_type2 == ex_type 271 && e2->_jvms->sp() == ex_map->_jvms->sp()) { 272 combine_exception_states(ex_map, e2); 273 return; 274 } 275 } 276 277 // No pre-existing exception of the same type. Chain it on the list. 278 push_exception_state(ex_map); 279 } 280 281 //-----------------------add_exception_states_from----------------------------- 282 void GraphKit::add_exception_states_from(JVMState* jvms) { 283 SafePointNode* ex_map = jvms->map()->next_exception(); 284 if (ex_map != NULL) { 285 jvms->map()->set_next_exception(NULL); 286 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) { 287 next_map = ex_map->next_exception(); 288 ex_map->set_next_exception(NULL); 289 add_exception_state(ex_map); 290 } 291 } 292 } 293 294 //-----------------------transfer_exceptions_into_jvms------------------------- 295 JVMState* GraphKit::transfer_exceptions_into_jvms() { 296 if (map() == NULL) { 297 // We need a JVMS to carry the exceptions, but the map has gone away. 298 // Create a scratch JVMS, cloned from any of the exception states... 299 if (has_exceptions()) { 300 _map = _exceptions; 301 _map = clone_map(); 302 _map->set_next_exception(NULL); 303 clear_saved_ex_oop(_map); 304 debug_only(verify_map()); 305 } else { 306 // ...or created from scratch 307 JVMState* jvms = new (C) JVMState(_method, NULL); 308 jvms->set_bci(_bci); 309 jvms->set_sp(_sp); 310 jvms->set_map(new SafePointNode(TypeFunc::Parms, jvms)); 311 set_jvms(jvms); 312 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top()); 313 set_all_memory(top()); 314 while (map()->req() < jvms->endoff()) map()->add_req(top()); 315 } 316 // (This is a kludge, in case you didn't notice.) 317 set_control(top()); 318 } 319 JVMState* jvms = sync_jvms(); 320 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet"); 321 jvms->map()->set_next_exception(_exceptions); 322 _exceptions = NULL; // done with this set of exceptions 323 return jvms; 324 } 325 326 static inline void add_n_reqs(Node* dstphi, Node* srcphi) { 327 assert(is_hidden_merge(dstphi), "must be a special merge node"); 328 assert(is_hidden_merge(srcphi), "must be a special merge node"); 329 uint limit = srcphi->req(); 330 for (uint i = PhiNode::Input; i < limit; i++) { 331 dstphi->add_req(srcphi->in(i)); 332 } 333 } 334 static inline void add_one_req(Node* dstphi, Node* src) { 335 assert(is_hidden_merge(dstphi), "must be a special merge node"); 336 assert(!is_hidden_merge(src), "must not be a special merge node"); 337 dstphi->add_req(src); 338 } 339 340 //-----------------------combine_exception_states------------------------------ 341 // This helper function combines exception states by building phis on a 342 // specially marked state-merging region. These regions and phis are 343 // untransformed, and can build up gradually. The region is marked by 344 // having a control input of its exception map, rather than NULL. Such 345 // regions do not appear except in this function, and in use_exception_state. 346 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) { 347 if (failing()) return; // dying anyway... 348 JVMState* ex_jvms = ex_map->_jvms; 349 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains"); 350 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals"); 351 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes"); 352 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS"); 353 assert(ex_jvms->scloff() == phi_map->_jvms->scloff(), "matching scalar replaced objects"); 354 assert(ex_map->req() == phi_map->req(), "matching maps"); 355 uint tos = ex_jvms->stkoff() + ex_jvms->sp(); 356 Node* hidden_merge_mark = root(); 357 Node* region = phi_map->control(); 358 MergeMemNode* phi_mem = phi_map->merged_memory(); 359 MergeMemNode* ex_mem = ex_map->merged_memory(); 360 if (region->in(0) != hidden_merge_mark) { 361 // The control input is not (yet) a specially-marked region in phi_map. 362 // Make it so, and build some phis. 363 region = new RegionNode(2); 364 _gvn.set_type(region, Type::CONTROL); 365 region->set_req(0, hidden_merge_mark); // marks an internal ex-state 366 region->init_req(1, phi_map->control()); 367 phi_map->set_control(region); 368 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO); 369 record_for_igvn(io_phi); 370 _gvn.set_type(io_phi, Type::ABIO); 371 phi_map->set_i_o(io_phi); 372 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) { 373 Node* m = mms.memory(); 374 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C)); 375 record_for_igvn(m_phi); 376 _gvn.set_type(m_phi, Type::MEMORY); 377 mms.set_memory(m_phi); 378 } 379 } 380 381 // Either or both of phi_map and ex_map might already be converted into phis. 382 Node* ex_control = ex_map->control(); 383 // if there is special marking on ex_map also, we add multiple edges from src 384 bool add_multiple = (ex_control->in(0) == hidden_merge_mark); 385 // how wide was the destination phi_map, originally? 386 uint orig_width = region->req(); 387 388 if (add_multiple) { 389 add_n_reqs(region, ex_control); 390 add_n_reqs(phi_map->i_o(), ex_map->i_o()); 391 } else { 392 // ex_map has no merges, so we just add single edges everywhere 393 add_one_req(region, ex_control); 394 add_one_req(phi_map->i_o(), ex_map->i_o()); 395 } 396 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) { 397 if (mms.is_empty()) { 398 // get a copy of the base memory, and patch some inputs into it 399 const TypePtr* adr_type = mms.adr_type(C); 400 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); 401 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); 402 mms.set_memory(phi); 403 // Prepare to append interesting stuff onto the newly sliced phi: 404 while (phi->req() > orig_width) phi->del_req(phi->req()-1); 405 } 406 // Append stuff from ex_map: 407 if (add_multiple) { 408 add_n_reqs(mms.memory(), mms.memory2()); 409 } else { 410 add_one_req(mms.memory(), mms.memory2()); 411 } 412 } 413 uint limit = ex_map->req(); 414 for (uint i = TypeFunc::Parms; i < limit; i++) { 415 // Skip everything in the JVMS after tos. (The ex_oop follows.) 416 if (i == tos) i = ex_jvms->monoff(); 417 Node* src = ex_map->in(i); 418 Node* dst = phi_map->in(i); 419 if (src != dst) { 420 PhiNode* phi; 421 if (dst->in(0) != region) { 422 dst = phi = PhiNode::make(region, dst, _gvn.type(dst)); 423 record_for_igvn(phi); 424 _gvn.set_type(phi, phi->type()); 425 phi_map->set_req(i, dst); 426 // Prepare to append interesting stuff onto the new phi: 427 while (dst->req() > orig_width) dst->del_req(dst->req()-1); 428 } else { 429 assert(dst->is_Phi(), "nobody else uses a hidden region"); 430 phi = dst->as_Phi(); 431 } 432 if (add_multiple && src->in(0) == ex_control) { 433 // Both are phis. 434 add_n_reqs(dst, src); 435 } else { 436 while (dst->req() < region->req()) add_one_req(dst, src); 437 } 438 const Type* srctype = _gvn.type(src); 439 if (phi->type() != srctype) { 440 const Type* dsttype = phi->type()->meet_speculative(srctype); 441 if (phi->type() != dsttype) { 442 phi->set_type(dsttype); 443 _gvn.set_type(phi, dsttype); 444 } 445 } 446 } 447 } 448 phi_map->merge_replaced_nodes_with(ex_map); 449 } 450 451 //--------------------------use_exception_state-------------------------------- 452 Node* GraphKit::use_exception_state(SafePointNode* phi_map) { 453 if (failing()) { stop(); return top(); } 454 Node* region = phi_map->control(); 455 Node* hidden_merge_mark = root(); 456 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation"); 457 Node* ex_oop = clear_saved_ex_oop(phi_map); 458 if (region->in(0) == hidden_merge_mark) { 459 // Special marking for internal ex-states. Process the phis now. 460 region->set_req(0, region); // now it's an ordinary region 461 set_jvms(phi_map->jvms()); // ...so now we can use it as a map 462 // Note: Setting the jvms also sets the bci and sp. 463 set_control(_gvn.transform(region)); 464 uint tos = jvms()->stkoff() + sp(); 465 for (uint i = 1; i < tos; i++) { 466 Node* x = phi_map->in(i); 467 if (x->in(0) == region) { 468 assert(x->is_Phi(), "expected a special phi"); 469 phi_map->set_req(i, _gvn.transform(x)); 470 } 471 } 472 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { 473 Node* x = mms.memory(); 474 if (x->in(0) == region) { 475 assert(x->is_Phi(), "nobody else uses a hidden region"); 476 mms.set_memory(_gvn.transform(x)); 477 } 478 } 479 if (ex_oop->in(0) == region) { 480 assert(ex_oop->is_Phi(), "expected a special phi"); 481 ex_oop = _gvn.transform(ex_oop); 482 } 483 } else { 484 set_jvms(phi_map->jvms()); 485 } 486 487 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared"); 488 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared"); 489 return ex_oop; 490 } 491 492 //---------------------------------java_bc------------------------------------- 493 Bytecodes::Code GraphKit::java_bc() const { 494 ciMethod* method = this->method(); 495 int bci = this->bci(); 496 if (method != NULL && bci != InvocationEntryBci) 497 return method->java_code_at_bci(bci); 498 else 499 return Bytecodes::_illegal; 500 } 501 502 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, 503 bool must_throw) { 504 // if the exception capability is set, then we will generate code 505 // to check the JavaThread.should_post_on_exceptions flag to see 506 // if we actually need to report exception events (for this 507 // thread). If we don't need to report exception events, we will 508 // take the normal fast path provided by add_exception_events. If 509 // exception event reporting is enabled for this thread, we will 510 // take the uncommon_trap in the BuildCutout below. 511 512 // first must access the should_post_on_exceptions_flag in this thread's JavaThread 513 Node* jthread = _gvn.transform(new ThreadLocalNode()); 514 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset())); 515 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, MemNode::unordered); 516 517 // Test the should_post_on_exceptions_flag vs. 0 518 Node* chk = _gvn.transform( new CmpINode(should_post_flag, intcon(0)) ); 519 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) ); 520 521 // Branch to slow_path if should_post_on_exceptions_flag was true 522 { BuildCutout unless(this, tst, PROB_MAX); 523 // Do not try anything fancy if we're notifying the VM on every throw. 524 // Cf. case Bytecodes::_athrow in parse2.cpp. 525 uncommon_trap(reason, Deoptimization::Action_none, 526 (ciKlass*)NULL, (char*)NULL, must_throw); 527 } 528 529 } 530 531 //------------------------------builtin_throw---------------------------------- 532 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { 533 bool must_throw = true; 534 535 if (env()->jvmti_can_post_on_exceptions()) { 536 // check if we must post exception events, take uncommon trap if so 537 uncommon_trap_if_should_post_on_exceptions(reason, must_throw); 538 // here if should_post_on_exceptions is false 539 // continue on with the normal codegen 540 } 541 542 // If this particular condition has not yet happened at this 543 // bytecode, then use the uncommon trap mechanism, and allow for 544 // a future recompilation if several traps occur here. 545 // If the throw is hot, try to use a more complicated inline mechanism 546 // which keeps execution inside the compiled code. 547 bool treat_throw_as_hot = false; 548 ciMethodData* md = method()->method_data(); 549 550 if (ProfileTraps) { 551 if (too_many_traps(reason)) { 552 treat_throw_as_hot = true; 553 } 554 // (If there is no MDO at all, assume it is early in 555 // execution, and that any deopts are part of the 556 // startup transient, and don't need to be remembered.) 557 558 // Also, if there is a local exception handler, treat all throws 559 // as hot if there has been at least one in this method. 560 if (C->trap_count(reason) != 0 561 && method()->method_data()->trap_count(reason) != 0 562 && has_ex_handler()) { 563 treat_throw_as_hot = true; 564 } 565 } 566 567 // If this throw happens frequently, an uncommon trap might cause 568 // a performance pothole. If there is a local exception handler, 569 // and if this particular bytecode appears to be deoptimizing often, 570 // let us handle the throw inline, with a preconstructed instance. 571 // Note: If the deopt count has blown up, the uncommon trap 572 // runtime is going to flush this nmethod, not matter what. 573 if (treat_throw_as_hot 574 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) { 575 // If the throw is local, we use a pre-existing instance and 576 // punt on the backtrace. This would lead to a missing backtrace 577 // (a repeat of 4292742) if the backtrace object is ever asked 578 // for its backtrace. 579 // Fixing this remaining case of 4292742 requires some flavor of 580 // escape analysis. Leave that for the future. 581 ciInstance* ex_obj = NULL; 582 switch (reason) { 583 case Deoptimization::Reason_null_check: 584 ex_obj = env()->NullPointerException_instance(); 585 break; 586 case Deoptimization::Reason_div0_check: 587 ex_obj = env()->ArithmeticException_instance(); 588 break; 589 case Deoptimization::Reason_range_check: 590 ex_obj = env()->ArrayIndexOutOfBoundsException_instance(); 591 break; 592 case Deoptimization::Reason_class_check: 593 if (java_bc() == Bytecodes::_aastore) { 594 ex_obj = env()->ArrayStoreException_instance(); 595 } else { 596 ex_obj = env()->ClassCastException_instance(); 597 } 598 break; 599 default: 600 break; 601 } 602 if (failing()) { stop(); return; } // exception allocation might fail 603 if (ex_obj != NULL) { 604 // Cheat with a preallocated exception object. 605 if (C->log() != NULL) 606 C->log()->elem("hot_throw preallocated='1' reason='%s'", 607 Deoptimization::trap_reason_name(reason)); 608 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj); 609 Node* ex_node = _gvn.transform(ConNode::make(ex_con)); 610 611 // Clear the detail message of the preallocated exception object. 612 // Weblogic sometimes mutates the detail message of exceptions 613 // using reflection. 614 int offset = java_lang_Throwable::get_detailMessage_offset(); 615 const TypePtr* adr_typ = ex_con->add_offset(offset); 616 617 Node *adr = basic_plus_adr(ex_node, ex_node, offset); 618 const TypeOopPtr* val_type = TypeOopPtr::make_from_klass(env()->String_klass()); 619 Node *store = access_store_at(control(), ex_node, adr, adr_typ, null(), val_type, T_OBJECT, IN_HEAP); 620 621 add_exception_state(make_exception_state(ex_node)); 622 return; 623 } 624 } 625 626 // %%% Maybe add entry to OptoRuntime which directly throws the exc.? 627 // It won't be much cheaper than bailing to the interp., since we'll 628 // have to pass up all the debug-info, and the runtime will have to 629 // create the stack trace. 630 631 // Usual case: Bail to interpreter. 632 // Reserve the right to recompile if we haven't seen anything yet. 633 634 ciMethod* m = Deoptimization::reason_is_speculate(reason) ? C->method() : NULL; 635 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile; 636 if (treat_throw_as_hot 637 && (method()->method_data()->trap_recompiled_at(bci(), m) 638 || C->too_many_traps(reason))) { 639 // We cannot afford to take more traps here. Suffer in the interpreter. 640 if (C->log() != NULL) 641 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'", 642 Deoptimization::trap_reason_name(reason), 643 C->trap_count(reason)); 644 action = Deoptimization::Action_none; 645 } 646 647 // "must_throw" prunes the JVM state to include only the stack, if there 648 // are no local exception handlers. This should cut down on register 649 // allocation time and code size, by drastically reducing the number 650 // of in-edges on the call to the uncommon trap. 651 652 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw); 653 } 654 655 656 //----------------------------PreserveJVMState--------------------------------- 657 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) { 658 debug_only(kit->verify_map()); 659 _kit = kit; 660 _map = kit->map(); // preserve the map 661 _sp = kit->sp(); 662 kit->set_map(clone_map ? kit->clone_map() : NULL); 663 #ifdef ASSERT 664 _bci = kit->bci(); 665 Parse* parser = kit->is_Parse(); 666 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); 667 _block = block; 668 #endif 669 } 670 PreserveJVMState::~PreserveJVMState() { 671 GraphKit* kit = _kit; 672 #ifdef ASSERT 673 assert(kit->bci() == _bci, "bci must not shift"); 674 Parse* parser = kit->is_Parse(); 675 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); 676 assert(block == _block, "block must not shift"); 677 #endif 678 kit->set_map(_map); 679 kit->set_sp(_sp); 680 } 681 682 683 //-----------------------------BuildCutout------------------------------------- 684 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt) 685 : PreserveJVMState(kit) 686 { 687 assert(p->is_Con() || p->is_Bool(), "test must be a bool"); 688 SafePointNode* outer_map = _map; // preserved map is caller's 689 SafePointNode* inner_map = kit->map(); 690 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt); 691 outer_map->set_control(kit->gvn().transform( new IfTrueNode(iff) )); 692 inner_map->set_control(kit->gvn().transform( new IfFalseNode(iff) )); 693 } 694 BuildCutout::~BuildCutout() { 695 GraphKit* kit = _kit; 696 assert(kit->stopped(), "cutout code must stop, throw, return, etc."); 697 } 698 699 //---------------------------PreserveReexecuteState---------------------------- 700 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) { 701 assert(!kit->stopped(), "must call stopped() before"); 702 _kit = kit; 703 _sp = kit->sp(); 704 _reexecute = kit->jvms()->_reexecute; 705 } 706 PreserveReexecuteState::~PreserveReexecuteState() { 707 if (_kit->stopped()) return; 708 _kit->jvms()->_reexecute = _reexecute; 709 _kit->set_sp(_sp); 710 } 711 712 //------------------------------clone_map-------------------------------------- 713 // Implementation of PreserveJVMState 714 // 715 // Only clone_map(...) here. If this function is only used in the 716 // PreserveJVMState class we may want to get rid of this extra 717 // function eventually and do it all there. 718 719 SafePointNode* GraphKit::clone_map() { 720 if (map() == NULL) return NULL; 721 722 // Clone the memory edge first 723 Node* mem = MergeMemNode::make(map()->memory()); 724 gvn().set_type_bottom(mem); 725 726 SafePointNode *clonemap = (SafePointNode*)map()->clone(); 727 JVMState* jvms = this->jvms(); 728 JVMState* clonejvms = jvms->clone_shallow(C); 729 clonemap->set_memory(mem); 730 clonemap->set_jvms(clonejvms); 731 clonejvms->set_map(clonemap); 732 record_for_igvn(clonemap); 733 gvn().set_type_bottom(clonemap); 734 return clonemap; 735 } 736 737 738 //-----------------------------set_map_clone----------------------------------- 739 void GraphKit::set_map_clone(SafePointNode* m) { 740 _map = m; 741 _map = clone_map(); 742 _map->set_next_exception(NULL); 743 debug_only(verify_map()); 744 } 745 746 747 //----------------------------kill_dead_locals--------------------------------- 748 // Detect any locals which are known to be dead, and force them to top. 749 void GraphKit::kill_dead_locals() { 750 // Consult the liveness information for the locals. If any 751 // of them are unused, then they can be replaced by top(). This 752 // should help register allocation time and cut down on the size 753 // of the deoptimization information. 754 755 // This call is made from many of the bytecode handling 756 // subroutines called from the Big Switch in do_one_bytecode. 757 // Every bytecode which might include a slow path is responsible 758 // for killing its dead locals. The more consistent we 759 // are about killing deads, the fewer useless phis will be 760 // constructed for them at various merge points. 761 762 // bci can be -1 (InvocationEntryBci). We return the entry 763 // liveness for the method. 764 765 if (method() == NULL || method()->code_size() == 0) { 766 // We are building a graph for a call to a native method. 767 // All locals are live. 768 return; 769 } 770 771 ResourceMark rm; 772 773 // Consult the liveness information for the locals. If any 774 // of them are unused, then they can be replaced by top(). This 775 // should help register allocation time and cut down on the size 776 // of the deoptimization information. 777 MethodLivenessResult live_locals = method()->liveness_at_bci(bci()); 778 779 int len = (int)live_locals.size(); 780 assert(len <= jvms()->loc_size(), "too many live locals"); 781 for (int local = 0; local < len; local++) { 782 if (!live_locals.at(local)) { 783 set_local(local, top()); 784 } 785 } 786 } 787 788 #ifdef ASSERT 789 //-------------------------dead_locals_are_killed------------------------------ 790 // Return true if all dead locals are set to top in the map. 791 // Used to assert "clean" debug info at various points. 792 bool GraphKit::dead_locals_are_killed() { 793 if (method() == NULL || method()->code_size() == 0) { 794 // No locals need to be dead, so all is as it should be. 795 return true; 796 } 797 798 // Make sure somebody called kill_dead_locals upstream. 799 ResourceMark rm; 800 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { 801 if (jvms->loc_size() == 0) continue; // no locals to consult 802 SafePointNode* map = jvms->map(); 803 ciMethod* method = jvms->method(); 804 int bci = jvms->bci(); 805 if (jvms == this->jvms()) { 806 bci = this->bci(); // it might not yet be synched 807 } 808 MethodLivenessResult live_locals = method->liveness_at_bci(bci); 809 int len = (int)live_locals.size(); 810 if (!live_locals.is_valid() || len == 0) 811 // This method is trivial, or is poisoned by a breakpoint. 812 return true; 813 assert(len == jvms->loc_size(), "live map consistent with locals map"); 814 for (int local = 0; local < len; local++) { 815 if (!live_locals.at(local) && map->local(jvms, local) != top()) { 816 if (PrintMiscellaneous && (Verbose || WizardMode)) { 817 tty->print_cr("Zombie local %d: ", local); 818 jvms->dump(); 819 } 820 return false; 821 } 822 } 823 } 824 return true; 825 } 826 827 #endif //ASSERT 828 829 // Helper function for enforcing certain bytecodes to reexecute if 830 // deoptimization happens 831 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) { 832 ciMethod* cur_method = jvms->method(); 833 int cur_bci = jvms->bci(); 834 if (cur_method != NULL && cur_bci != InvocationEntryBci) { 835 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); 836 return Interpreter::bytecode_should_reexecute(code) || 837 (is_anewarray && (code == Bytecodes::_multianewarray)); 838 // Reexecute _multianewarray bytecode which was replaced with 839 // sequence of [a]newarray. See Parse::do_multianewarray(). 840 // 841 // Note: interpreter should not have it set since this optimization 842 // is limited by dimensions and guarded by flag so in some cases 843 // multianewarray() runtime calls will be generated and 844 // the bytecode should not be reexecutes (stack will not be reset). 845 } else { 846 return false; 847 } 848 } 849 850 // Helper function for adding JVMState and debug information to node 851 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) { 852 // Add the safepoint edges to the call (or other safepoint). 853 854 // Make sure dead locals are set to top. This 855 // should help register allocation time and cut down on the size 856 // of the deoptimization information. 857 assert(dead_locals_are_killed(), "garbage in debug info before safepoint"); 858 859 // Walk the inline list to fill in the correct set of JVMState's 860 // Also fill in the associated edges for each JVMState. 861 862 // If the bytecode needs to be reexecuted we need to put 863 // the arguments back on the stack. 864 const bool should_reexecute = jvms()->should_reexecute(); 865 JVMState* youngest_jvms = should_reexecute ? sync_jvms_for_reexecute() : sync_jvms(); 866 867 // NOTE: set_bci (called from sync_jvms) might reset the reexecute bit to 868 // undefined if the bci is different. This is normal for Parse but it 869 // should not happen for LibraryCallKit because only one bci is processed. 870 assert(!is_LibraryCallKit() || (jvms()->should_reexecute() == should_reexecute), 871 "in LibraryCallKit the reexecute bit should not change"); 872 873 // If we are guaranteed to throw, we can prune everything but the 874 // input to the current bytecode. 875 bool can_prune_locals = false; 876 uint stack_slots_not_pruned = 0; 877 int inputs = 0, depth = 0; 878 if (must_throw) { 879 assert(method() == youngest_jvms->method(), "sanity"); 880 if (compute_stack_effects(inputs, depth)) { 881 can_prune_locals = true; 882 stack_slots_not_pruned = inputs; 883 } 884 } 885 886 if (env()->should_retain_local_variables()) { 887 // At any safepoint, this method can get breakpointed, which would 888 // then require an immediate deoptimization. 889 can_prune_locals = false; // do not prune locals 890 stack_slots_not_pruned = 0; 891 } 892 893 // do not scribble on the input jvms 894 JVMState* out_jvms = youngest_jvms->clone_deep(C); 895 call->set_jvms(out_jvms); // Start jvms list for call node 896 897 // For a known set of bytecodes, the interpreter should reexecute them if 898 // deoptimization happens. We set the reexecute state for them here 899 if (out_jvms->is_reexecute_undefined() && //don't change if already specified 900 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) { 901 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed 902 } 903 904 // Presize the call: 905 DEBUG_ONLY(uint non_debug_edges = call->req()); 906 call->add_req_batch(top(), youngest_jvms->debug_depth()); 907 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); 908 909 // Set up edges so that the call looks like this: 910 // Call [state:] ctl io mem fptr retadr 911 // [parms:] parm0 ... parmN 912 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN 913 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] 914 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN 915 // Note that caller debug info precedes callee debug info. 916 917 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: 918 uint debug_ptr = call->req(); 919 920 // Loop over the map input edges associated with jvms, add them 921 // to the call node, & reset all offsets to match call node array. 922 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { 923 uint debug_end = debug_ptr; 924 uint debug_start = debug_ptr - in_jvms->debug_size(); 925 debug_ptr = debug_start; // back up the ptr 926 927 uint p = debug_start; // walks forward in [debug_start, debug_end) 928 uint j, k, l; 929 SafePointNode* in_map = in_jvms->map(); 930 out_jvms->set_map(call); 931 932 if (can_prune_locals) { 933 assert(in_jvms->method() == out_jvms->method(), "sanity"); 934 // If the current throw can reach an exception handler in this JVMS, 935 // then we must keep everything live that can reach that handler. 936 // As a quick and dirty approximation, we look for any handlers at all. 937 if (in_jvms->method()->has_exception_handlers()) { 938 can_prune_locals = false; 939 } 940 } 941 942 // Add the Locals 943 k = in_jvms->locoff(); 944 l = in_jvms->loc_size(); 945 out_jvms->set_locoff(p); 946 if (!can_prune_locals) { 947 for (j = 0; j < l; j++) 948 call->set_req(p++, in_map->in(k+j)); 949 } else { 950 p += l; // already set to top above by add_req_batch 951 } 952 953 // Add the Expression Stack 954 k = in_jvms->stkoff(); 955 l = in_jvms->sp(); 956 out_jvms->set_stkoff(p); 957 if (!can_prune_locals) { 958 for (j = 0; j < l; j++) 959 call->set_req(p++, in_map->in(k+j)); 960 } else if (can_prune_locals && stack_slots_not_pruned != 0) { 961 // Divide stack into {S0,...,S1}, where S0 is set to top. 962 uint s1 = stack_slots_not_pruned; 963 stack_slots_not_pruned = 0; // for next iteration 964 if (s1 > l) s1 = l; 965 uint s0 = l - s1; 966 p += s0; // skip the tops preinstalled by add_req_batch 967 for (j = s0; j < l; j++) 968 call->set_req(p++, in_map->in(k+j)); 969 } else { 970 p += l; // already set to top above by add_req_batch 971 } 972 973 // Add the Monitors 974 k = in_jvms->monoff(); 975 l = in_jvms->mon_size(); 976 out_jvms->set_monoff(p); 977 for (j = 0; j < l; j++) 978 call->set_req(p++, in_map->in(k+j)); 979 980 // Copy any scalar object fields. 981 k = in_jvms->scloff(); 982 l = in_jvms->scl_size(); 983 out_jvms->set_scloff(p); 984 for (j = 0; j < l; j++) 985 call->set_req(p++, in_map->in(k+j)); 986 987 // Finish the new jvms. 988 out_jvms->set_endoff(p); 989 990 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); 991 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); 992 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); 993 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); 994 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); 995 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); 996 997 // Update the two tail pointers in parallel. 998 out_jvms = out_jvms->caller(); 999 in_jvms = in_jvms->caller(); 1000 } 1001 1002 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); 1003 1004 // Test the correctness of JVMState::debug_xxx accessors: 1005 assert(call->jvms()->debug_start() == non_debug_edges, ""); 1006 assert(call->jvms()->debug_end() == call->req(), ""); 1007 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); 1008 } 1009 1010 bool GraphKit::compute_stack_effects(int& inputs, int& depth) { 1011 Bytecodes::Code code = java_bc(); 1012 if (code == Bytecodes::_wide) { 1013 code = method()->java_code_at_bci(bci() + 1); 1014 } 1015 1016 BasicType rtype = T_ILLEGAL; 1017 int rsize = 0; 1018 1019 if (code != Bytecodes::_illegal) { 1020 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1 1021 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V 1022 if (rtype < T_CONFLICT) 1023 rsize = type2size[rtype]; 1024 } 1025 1026 switch (code) { 1027 case Bytecodes::_illegal: 1028 return false; 1029 1030 case Bytecodes::_ldc: 1031 case Bytecodes::_ldc_w: 1032 case Bytecodes::_ldc2_w: 1033 inputs = 0; 1034 break; 1035 1036 case Bytecodes::_dup: inputs = 1; break; 1037 case Bytecodes::_dup_x1: inputs = 2; break; 1038 case Bytecodes::_dup_x2: inputs = 3; break; 1039 case Bytecodes::_dup2: inputs = 2; break; 1040 case Bytecodes::_dup2_x1: inputs = 3; break; 1041 case Bytecodes::_dup2_x2: inputs = 4; break; 1042 case Bytecodes::_swap: inputs = 2; break; 1043 case Bytecodes::_arraylength: inputs = 1; break; 1044 1045 case Bytecodes::_getstatic: 1046 case Bytecodes::_putstatic: 1047 case Bytecodes::_getfield: 1048 case Bytecodes::_putfield: 1049 { 1050 bool ignored_will_link; 1051 ciField* field = method()->get_field_at_bci(bci(), ignored_will_link); 1052 int size = field->type()->size(); 1053 bool is_get = (depth >= 0), is_static = (depth & 1); 1054 inputs = (is_static ? 0 : 1); 1055 if (is_get) { 1056 depth = size - inputs; 1057 } else { 1058 inputs += size; // putxxx pops the value from the stack 1059 depth = - inputs; 1060 } 1061 } 1062 break; 1063 1064 case Bytecodes::_invokevirtual: 1065 case Bytecodes::_invokespecial: 1066 case Bytecodes::_invokestatic: 1067 case Bytecodes::_invokedynamic: 1068 case Bytecodes::_invokeinterface: 1069 { 1070 bool ignored_will_link; 1071 ciSignature* declared_signature = NULL; 1072 ciMethod* ignored_callee = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature); 1073 assert(declared_signature != NULL, "cannot be null"); 1074 inputs = declared_signature->arg_size_for_bc(code); 1075 int size = declared_signature->return_type()->size(); 1076 depth = size - inputs; 1077 } 1078 break; 1079 1080 case Bytecodes::_multianewarray: 1081 { 1082 ciBytecodeStream iter(method()); 1083 iter.reset_to_bci(bci()); 1084 iter.next(); 1085 inputs = iter.get_dimensions(); 1086 assert(rsize == 1, ""); 1087 depth = rsize - inputs; 1088 } 1089 break; 1090 1091 case Bytecodes::_withfield: { 1092 bool ignored_will_link; 1093 ciField* field = method()->get_field_at_bci(bci(), ignored_will_link); 1094 int size = field->type()->size(); 1095 inputs = size+1; 1096 depth = rsize - inputs; 1097 break; 1098 } 1099 1100 case Bytecodes::_ireturn: 1101 case Bytecodes::_lreturn: 1102 case Bytecodes::_freturn: 1103 case Bytecodes::_dreturn: 1104 case Bytecodes::_areturn: 1105 assert(rsize == -depth, ""); 1106 inputs = rsize; 1107 break; 1108 1109 case Bytecodes::_jsr: 1110 case Bytecodes::_jsr_w: 1111 inputs = 0; 1112 depth = 1; // S.B. depth=1, not zero 1113 break; 1114 1115 default: 1116 // bytecode produces a typed result 1117 inputs = rsize - depth; 1118 assert(inputs >= 0, ""); 1119 break; 1120 } 1121 1122 #ifdef ASSERT 1123 // spot check 1124 int outputs = depth + inputs; 1125 assert(outputs >= 0, "sanity"); 1126 switch (code) { 1127 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break; 1128 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break; 1129 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break; 1130 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break; 1131 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break; 1132 default: break; 1133 } 1134 #endif //ASSERT 1135 1136 return true; 1137 } 1138 1139 1140 1141 //------------------------------basic_plus_adr--------------------------------- 1142 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) { 1143 // short-circuit a common case 1144 if (offset == intcon(0)) return ptr; 1145 return _gvn.transform( new AddPNode(base, ptr, offset) ); 1146 } 1147 1148 Node* GraphKit::ConvI2L(Node* offset) { 1149 // short-circuit a common case 1150 jint offset_con = find_int_con(offset, Type::OffsetBot); 1151 if (offset_con != Type::OffsetBot) { 1152 return longcon((jlong) offset_con); 1153 } 1154 return _gvn.transform( new ConvI2LNode(offset)); 1155 } 1156 1157 Node* GraphKit::ConvI2UL(Node* offset) { 1158 juint offset_con = (juint) find_int_con(offset, Type::OffsetBot); 1159 if (offset_con != (juint) Type::OffsetBot) { 1160 return longcon((julong) offset_con); 1161 } 1162 Node* conv = _gvn.transform( new ConvI2LNode(offset)); 1163 Node* mask = _gvn.transform(ConLNode::make((julong) max_juint)); 1164 return _gvn.transform( new AndLNode(conv, mask) ); 1165 } 1166 1167 Node* GraphKit::ConvL2I(Node* offset) { 1168 // short-circuit a common case 1169 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot); 1170 if (offset_con != (jlong)Type::OffsetBot) { 1171 return intcon((int) offset_con); 1172 } 1173 return _gvn.transform( new ConvL2INode(offset)); 1174 } 1175 1176 //-------------------------load_object_klass----------------------------------- 1177 Node* GraphKit::load_object_klass(Node* obj) { 1178 // Special-case a fresh allocation to avoid building nodes: 1179 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn); 1180 if (akls != NULL) return akls; 1181 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); 1182 return _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), k_adr, TypeInstPtr::KLASS)); 1183 } 1184 1185 //-------------------------load_array_length----------------------------------- 1186 Node* GraphKit::load_array_length(Node* array) { 1187 // Special-case a fresh allocation to avoid building nodes: 1188 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn); 1189 Node *alen; 1190 if (alloc == NULL) { 1191 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes()); 1192 alen = _gvn.transform( new LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS)); 1193 } else { 1194 alen = alloc->Ideal_length(); 1195 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn); 1196 if (ccast != alen) { 1197 alen = _gvn.transform(ccast); 1198 } 1199 } 1200 return alen; 1201 } 1202 1203 //------------------------------do_null_check---------------------------------- 1204 // Helper function to do a NULL pointer check. Returned value is 1205 // the incoming address with NULL casted away. You are allowed to use the 1206 // not-null value only if you are control dependent on the test. 1207 #ifndef PRODUCT 1208 extern int explicit_null_checks_inserted, 1209 explicit_null_checks_elided; 1210 #endif 1211 Node* GraphKit::null_check_common(Node* value, BasicType type, 1212 // optional arguments for variations: 1213 bool assert_null, 1214 Node* *null_control, 1215 bool speculative) { 1216 assert(!assert_null || null_control == NULL, "not both at once"); 1217 if (stopped()) return top(); 1218 NOT_PRODUCT(explicit_null_checks_inserted++); 1219 1220 // Construct NULL check 1221 Node *chk = NULL; 1222 switch(type) { 1223 case T_LONG : chk = new CmpLNode(value, _gvn.zerocon(T_LONG)); break; 1224 case T_INT : chk = new CmpINode(value, _gvn.intcon(0)); break; 1225 case T_VALUETYPE : // fall through 1226 case T_ARRAY : // fall through 1227 type = T_OBJECT; // simplify further tests 1228 case T_OBJECT : { 1229 const Type *t = _gvn.type( value ); 1230 1231 const TypeOopPtr* tp = t->isa_oopptr(); 1232 if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded() 1233 // Only for do_null_check, not any of its siblings: 1234 && !assert_null && null_control == NULL) { 1235 // Usually, any field access or invocation on an unloaded oop type 1236 // will simply fail to link, since the statically linked class is 1237 // likely also to be unloaded. However, in -Xcomp mode, sometimes 1238 // the static class is loaded but the sharper oop type is not. 1239 // Rather than checking for this obscure case in lots of places, 1240 // we simply observe that a null check on an unloaded class 1241 // will always be followed by a nonsense operation, so we 1242 // can just issue the uncommon trap here. 1243 // Our access to the unloaded class will only be correct 1244 // after it has been loaded and initialized, which requires 1245 // a trip through the interpreter. 1246 #ifndef PRODUCT 1247 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); } 1248 #endif 1249 uncommon_trap(Deoptimization::Reason_unloaded, 1250 Deoptimization::Action_reinterpret, 1251 tp->klass(), "!loaded"); 1252 return top(); 1253 } 1254 1255 if (assert_null) { 1256 // See if the type is contained in NULL_PTR. 1257 // If so, then the value is already null. 1258 if (t->higher_equal(TypePtr::NULL_PTR)) { 1259 NOT_PRODUCT(explicit_null_checks_elided++); 1260 return value; // Elided null assert quickly! 1261 } 1262 } else { 1263 // See if mixing in the NULL pointer changes type. 1264 // If so, then the NULL pointer was not allowed in the original 1265 // type. In other words, "value" was not-null. 1266 if (t->meet(TypePtr::NULL_PTR) != t->remove_speculative()) { 1267 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ... 1268 NOT_PRODUCT(explicit_null_checks_elided++); 1269 return value; // Elided null check quickly! 1270 } 1271 } 1272 chk = new CmpPNode( value, null() ); 1273 break; 1274 } 1275 1276 default: 1277 fatal("unexpected type: %s", type2name(type)); 1278 } 1279 assert(chk != NULL, "sanity check"); 1280 chk = _gvn.transform(chk); 1281 1282 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne; 1283 BoolNode *btst = new BoolNode( chk, btest); 1284 Node *tst = _gvn.transform( btst ); 1285 1286 //----------- 1287 // if peephole optimizations occurred, a prior test existed. 1288 // If a prior test existed, maybe it dominates as we can avoid this test. 1289 if (tst != btst && type == T_OBJECT) { 1290 // At this point we want to scan up the CFG to see if we can 1291 // find an identical test (and so avoid this test altogether). 1292 Node *cfg = control(); 1293 int depth = 0; 1294 while( depth < 16 ) { // Limit search depth for speed 1295 if( cfg->Opcode() == Op_IfTrue && 1296 cfg->in(0)->in(1) == tst ) { 1297 // Found prior test. Use "cast_not_null" to construct an identical 1298 // CastPP (and hence hash to) as already exists for the prior test. 1299 // Return that casted value. 1300 if (assert_null) { 1301 replace_in_map(value, null()); 1302 return null(); // do not issue the redundant test 1303 } 1304 Node *oldcontrol = control(); 1305 set_control(cfg); 1306 Node *res = cast_not_null(value); 1307 set_control(oldcontrol); 1308 NOT_PRODUCT(explicit_null_checks_elided++); 1309 return res; 1310 } 1311 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true); 1312 if (cfg == NULL) break; // Quit at region nodes 1313 depth++; 1314 } 1315 } 1316 1317 //----------- 1318 // Branch to failure if null 1319 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen 1320 Deoptimization::DeoptReason reason; 1321 if (assert_null) { 1322 reason = Deoptimization::reason_null_assert(speculative); 1323 } else if (type == T_OBJECT) { 1324 reason = Deoptimization::reason_null_check(speculative); 1325 } else { 1326 reason = Deoptimization::Reason_div0_check; 1327 } 1328 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis, 1329 // ciMethodData::has_trap_at will return a conservative -1 if any 1330 // must-be-null assertion has failed. This could cause performance 1331 // problems for a method after its first do_null_assert failure. 1332 // Consider using 'Reason_class_check' instead? 1333 1334 // To cause an implicit null check, we set the not-null probability 1335 // to the maximum (PROB_MAX). For an explicit check the probability 1336 // is set to a smaller value. 1337 if (null_control != NULL || too_many_traps(reason)) { 1338 // probability is less likely 1339 ok_prob = PROB_LIKELY_MAG(3); 1340 } else if (!assert_null && 1341 (ImplicitNullCheckThreshold > 0) && 1342 method() != NULL && 1343 (method()->method_data()->trap_count(reason) 1344 >= (uint)ImplicitNullCheckThreshold)) { 1345 ok_prob = PROB_LIKELY_MAG(3); 1346 } 1347 1348 if (null_control != NULL) { 1349 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN); 1350 Node* null_true = _gvn.transform( new IfFalseNode(iff)); 1351 set_control( _gvn.transform( new IfTrueNode(iff))); 1352 #ifndef PRODUCT 1353 if (null_true == top()) { 1354 explicit_null_checks_elided++; 1355 } 1356 #endif 1357 (*null_control) = null_true; 1358 } else { 1359 BuildCutout unless(this, tst, ok_prob); 1360 // Check for optimizer eliding test at parse time 1361 if (stopped()) { 1362 // Failure not possible; do not bother making uncommon trap. 1363 NOT_PRODUCT(explicit_null_checks_elided++); 1364 } else if (assert_null) { 1365 uncommon_trap(reason, 1366 Deoptimization::Action_make_not_entrant, 1367 NULL, "assert_null"); 1368 } else { 1369 replace_in_map(value, zerocon(type)); 1370 builtin_throw(reason); 1371 } 1372 } 1373 1374 // Must throw exception, fall-thru not possible? 1375 if (stopped()) { 1376 return top(); // No result 1377 } 1378 1379 if (assert_null) { 1380 // Cast obj to null on this path. 1381 replace_in_map(value, zerocon(type)); 1382 return zerocon(type); 1383 } 1384 1385 // Cast obj to not-null on this path, if there is no null_control. 1386 // (If there is a null_control, a non-null value may come back to haunt us.) 1387 if (type == T_OBJECT) { 1388 Node* cast = cast_not_null(value, false); 1389 if (null_control == NULL || (*null_control) == top()) 1390 replace_in_map(value, cast); 1391 value = cast; 1392 } 1393 1394 return value; 1395 } 1396 1397 1398 //------------------------------cast_not_null---------------------------------- 1399 // Cast obj to not-null on this path 1400 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) { 1401 assert(!obj->is_ValueType(), "should not cast value type"); 1402 const Type *t = _gvn.type(obj); 1403 const Type *t_not_null = t->join_speculative(TypePtr::NOTNULL); 1404 // Object is already not-null? 1405 if( t == t_not_null ) return obj; 1406 1407 Node *cast = new CastPPNode(obj,t_not_null); 1408 cast->init_req(0, control()); 1409 cast = _gvn.transform( cast ); 1410 1411 // Scan for instances of 'obj' in the current JVM mapping. 1412 // These instances are known to be not-null after the test. 1413 if (do_replace_in_map) 1414 replace_in_map(obj, cast); 1415 1416 return cast; // Return casted value 1417 } 1418 1419 // Sometimes in intrinsics, we implicitly know an object is not null 1420 // (there's no actual null check) so we can cast it to not null. In 1421 // the course of optimizations, the input to the cast can become null. 1422 // In that case that data path will die and we need the control path 1423 // to become dead as well to keep the graph consistent. So we have to 1424 // add a check for null for which one branch can't be taken. It uses 1425 // an Opaque4 node that will cause the check to be removed after loop 1426 // opts so the test goes away and the compiled code doesn't execute a 1427 // useless check. 1428 Node* GraphKit::must_be_not_null(Node* value, bool do_replace_in_map) { 1429 Node* chk = _gvn.transform(new CmpPNode(value, null())); 1430 Node *tst = _gvn.transform(new BoolNode(chk, BoolTest::ne)); 1431 Node* opaq = _gvn.transform(new Opaque4Node(C, tst, intcon(1))); 1432 IfNode *iff = new IfNode(control(), opaq, PROB_MAX, COUNT_UNKNOWN); 1433 _gvn.set_type(iff, iff->Value(&_gvn)); 1434 Node *if_f = _gvn.transform(new IfFalseNode(iff)); 1435 Node *frame = _gvn.transform(new ParmNode(C->start(), TypeFunc::FramePtr)); 1436 Node *halt = _gvn.transform(new HaltNode(if_f, frame)); 1437 C->root()->add_req(halt); 1438 Node *if_t = _gvn.transform(new IfTrueNode(iff)); 1439 set_control(if_t); 1440 return cast_not_null(value, do_replace_in_map); 1441 } 1442 1443 1444 //--------------------------replace_in_map------------------------------------- 1445 void GraphKit::replace_in_map(Node* old, Node* neww) { 1446 if (old == neww) { 1447 return; 1448 } 1449 1450 map()->replace_edge(old, neww); 1451 1452 // Note: This operation potentially replaces any edge 1453 // on the map. This includes locals, stack, and monitors 1454 // of the current (innermost) JVM state. 1455 1456 // don't let inconsistent types from profiling escape this 1457 // method 1458 1459 const Type* told = _gvn.type(old); 1460 const Type* tnew = _gvn.type(neww); 1461 1462 if (!tnew->higher_equal(told)) { 1463 return; 1464 } 1465 1466 map()->record_replaced_node(old, neww); 1467 } 1468 1469 1470 //============================================================================= 1471 //--------------------------------memory--------------------------------------- 1472 Node* GraphKit::memory(uint alias_idx) { 1473 MergeMemNode* mem = merged_memory(); 1474 Node* p = mem->memory_at(alias_idx); 1475 _gvn.set_type(p, Type::MEMORY); // must be mapped 1476 return p; 1477 } 1478 1479 //-----------------------------reset_memory------------------------------------ 1480 Node* GraphKit::reset_memory() { 1481 Node* mem = map()->memory(); 1482 // do not use this node for any more parsing! 1483 debug_only( map()->set_memory((Node*)NULL) ); 1484 return _gvn.transform( mem ); 1485 } 1486 1487 //------------------------------set_all_memory--------------------------------- 1488 void GraphKit::set_all_memory(Node* newmem) { 1489 Node* mergemem = MergeMemNode::make(newmem); 1490 gvn().set_type_bottom(mergemem); 1491 map()->set_memory(mergemem); 1492 } 1493 1494 //------------------------------set_all_memory_call---------------------------- 1495 void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) { 1496 Node* newmem = _gvn.transform( new ProjNode(call, TypeFunc::Memory, separate_io_proj) ); 1497 set_all_memory(newmem); 1498 } 1499 1500 //============================================================================= 1501 // 1502 // parser factory methods for MemNodes 1503 // 1504 // These are layered on top of the factory methods in LoadNode and StoreNode, 1505 // and integrate with the parser's memory state and _gvn engine. 1506 // 1507 1508 // factory methods in "int adr_idx" 1509 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, 1510 int adr_idx, 1511 MemNode::MemOrd mo, 1512 LoadNode::ControlDependency control_dependency, 1513 bool require_atomic_access, 1514 bool unaligned, 1515 bool mismatched) { 1516 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); 1517 const TypePtr* adr_type = NULL; // debug-mode-only argument 1518 debug_only(adr_type = C->get_adr_type(adr_idx)); 1519 Node* mem = memory(adr_idx); 1520 Node* ld; 1521 if (require_atomic_access && bt == T_LONG) { 1522 ld = LoadLNode::make_atomic(ctl, mem, adr, adr_type, t, mo, control_dependency, unaligned, mismatched); 1523 } else if (require_atomic_access && bt == T_DOUBLE) { 1524 ld = LoadDNode::make_atomic(ctl, mem, adr, adr_type, t, mo, control_dependency, unaligned, mismatched); 1525 } else { 1526 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt, mo, control_dependency, unaligned, mismatched); 1527 } 1528 ld = _gvn.transform(ld); 1529 1530 if (((bt == T_OBJECT || bt == T_VALUETYPE || bt == T_VALUETYPEPTR) && C->do_escape_analysis()) || C->eliminate_boxing()) { 1531 // Improve graph before escape analysis and boxing elimination. 1532 record_for_igvn(ld); 1533 } 1534 return ld; 1535 } 1536 1537 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt, 1538 int adr_idx, 1539 MemNode::MemOrd mo, 1540 bool require_atomic_access, 1541 bool unaligned, 1542 bool mismatched) { 1543 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); 1544 const TypePtr* adr_type = NULL; 1545 debug_only(adr_type = C->get_adr_type(adr_idx)); 1546 Node *mem = memory(adr_idx); 1547 Node* st; 1548 if (require_atomic_access && bt == T_LONG) { 1549 st = StoreLNode::make_atomic(ctl, mem, adr, adr_type, val, mo); 1550 } else if (require_atomic_access && bt == T_DOUBLE) { 1551 st = StoreDNode::make_atomic(ctl, mem, adr, adr_type, val, mo); 1552 } else { 1553 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt, mo); 1554 } 1555 if (unaligned) { 1556 st->as_Store()->set_unaligned_access(); 1557 } 1558 if (mismatched) { 1559 st->as_Store()->set_mismatched_access(); 1560 } 1561 st = _gvn.transform(st); 1562 set_memory(st, adr_idx); 1563 // Back-to-back stores can only remove intermediate store with DU info 1564 // so push on worklist for optimizer. 1565 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address)) 1566 record_for_igvn(st); 1567 1568 return st; 1569 } 1570 1571 Node* GraphKit::access_store_at(Node* ctl, 1572 Node* obj, 1573 Node* adr, 1574 const TypePtr* adr_type, 1575 Node* val, 1576 const Type* val_type, 1577 BasicType bt, 1578 DecoratorSet decorators, 1579 bool deoptimize_on_exception) { 1580 // Transformation of a value which could be NULL pointer (CastPP #NULL) 1581 // could be delayed during Parse (for example, in adjust_map_after_if()). 1582 // Execute transformation here to avoid barrier generation in such case. 1583 if (_gvn.type(val) == TypePtr::NULL_PTR) { 1584 val = _gvn.makecon(TypePtr::NULL_PTR); 1585 } 1586 1587 set_control(ctl); 1588 if (stopped()) { 1589 return top(); // Dead path ? 1590 } 1591 1592 assert(val != NULL, "not dead path"); 1593 if (val->is_ValueType()) { 1594 // Allocate value type and get oop 1595 val = val->as_ValueType()->allocate(this, deoptimize_on_exception)->get_oop(); 1596 } 1597 1598 C2AccessValuePtr addr(adr, adr_type); 1599 C2AccessValue value(val, val_type); 1600 C2Access access(this, decorators | C2_WRITE_ACCESS, bt, obj, addr); 1601 if (access.is_raw()) { 1602 return _barrier_set->BarrierSetC2::store_at(access, value); 1603 } else { 1604 return _barrier_set->store_at(access, value); 1605 } 1606 } 1607 1608 Node* GraphKit::access_load_at(Node* obj, // containing obj 1609 Node* adr, // actual adress to store val at 1610 const TypePtr* adr_type, 1611 const Type* val_type, 1612 BasicType bt, 1613 DecoratorSet decorators) { 1614 if (stopped()) { 1615 return top(); // Dead path ? 1616 } 1617 1618 C2AccessValuePtr addr(adr, adr_type); 1619 C2Access access(this, decorators | C2_READ_ACCESS, bt, obj, addr); 1620 if (access.is_raw()) { 1621 return _barrier_set->BarrierSetC2::load_at(access, val_type); 1622 } else { 1623 return _barrier_set->load_at(access, val_type); 1624 } 1625 } 1626 1627 Node* GraphKit::access_load(Node* adr, // actual adress to load val at 1628 const Type* val_type, 1629 BasicType bt, 1630 DecoratorSet decorators) { 1631 if (stopped()) { 1632 return top(); // Dead path ? 1633 } 1634 1635 C2AccessValuePtr addr(adr, NULL); 1636 C2Access access(this, decorators | C2_READ_ACCESS, bt, NULL, addr); 1637 if (access.is_raw()) { 1638 return _barrier_set->BarrierSetC2::load_at(access, val_type); 1639 } else { 1640 return _barrier_set->load_at(access, val_type); 1641 } 1642 } 1643 1644 Node* GraphKit::access_atomic_cmpxchg_val_at(Node* ctl, 1645 Node* obj, 1646 Node* adr, 1647 const TypePtr* adr_type, 1648 int alias_idx, 1649 Node* expected_val, 1650 Node* new_val, 1651 const Type* value_type, 1652 BasicType bt, 1653 DecoratorSet decorators) { 1654 set_control(ctl); 1655 C2AccessValuePtr addr(adr, adr_type); 1656 C2AtomicAccess access(this, decorators | C2_READ_ACCESS | C2_WRITE_ACCESS, 1657 bt, obj, addr, alias_idx); 1658 if (access.is_raw()) { 1659 return _barrier_set->BarrierSetC2::atomic_cmpxchg_val_at(access, expected_val, new_val, value_type); 1660 } else { 1661 return _barrier_set->atomic_cmpxchg_val_at(access, expected_val, new_val, value_type); 1662 } 1663 } 1664 1665 Node* GraphKit::access_atomic_cmpxchg_bool_at(Node* ctl, 1666 Node* obj, 1667 Node* adr, 1668 const TypePtr* adr_type, 1669 int alias_idx, 1670 Node* expected_val, 1671 Node* new_val, 1672 const Type* value_type, 1673 BasicType bt, 1674 DecoratorSet decorators) { 1675 set_control(ctl); 1676 C2AccessValuePtr addr(adr, adr_type); 1677 C2AtomicAccess access(this, decorators | C2_READ_ACCESS | C2_WRITE_ACCESS, 1678 bt, obj, addr, alias_idx); 1679 if (access.is_raw()) { 1680 return _barrier_set->BarrierSetC2::atomic_cmpxchg_bool_at(access, expected_val, new_val, value_type); 1681 } else { 1682 return _barrier_set->atomic_cmpxchg_bool_at(access, expected_val, new_val, value_type); 1683 } 1684 } 1685 1686 Node* GraphKit::access_atomic_xchg_at(Node* ctl, 1687 Node* obj, 1688 Node* adr, 1689 const TypePtr* adr_type, 1690 int alias_idx, 1691 Node* new_val, 1692 const Type* value_type, 1693 BasicType bt, 1694 DecoratorSet decorators) { 1695 set_control(ctl); 1696 C2AccessValuePtr addr(adr, adr_type); 1697 C2AtomicAccess access(this, decorators | C2_READ_ACCESS | C2_WRITE_ACCESS, 1698 bt, obj, addr, alias_idx); 1699 if (access.is_raw()) { 1700 return _barrier_set->BarrierSetC2::atomic_xchg_at(access, new_val, value_type); 1701 } else { 1702 return _barrier_set->atomic_xchg_at(access, new_val, value_type); 1703 } 1704 } 1705 1706 Node* GraphKit::access_atomic_add_at(Node* ctl, 1707 Node* obj, 1708 Node* adr, 1709 const TypePtr* adr_type, 1710 int alias_idx, 1711 Node* new_val, 1712 const Type* value_type, 1713 BasicType bt, 1714 DecoratorSet decorators) { 1715 set_control(ctl); 1716 C2AccessValuePtr addr(adr, adr_type); 1717 C2AtomicAccess access(this, decorators | C2_READ_ACCESS | C2_WRITE_ACCESS, bt, obj, addr, alias_idx); 1718 if (access.is_raw()) { 1719 return _barrier_set->BarrierSetC2::atomic_add_at(access, new_val, value_type); 1720 } else { 1721 return _barrier_set->atomic_add_at(access, new_val, value_type); 1722 } 1723 } 1724 1725 void GraphKit::access_clone(Node* ctl, Node* src_base, Node* dst_base, Node* countx, bool is_array) { 1726 set_control(ctl); 1727 return _barrier_set->clone(this, src_base, dst_base, countx, is_array); 1728 } 1729 1730 //-------------------------array_element_address------------------------- 1731 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt, 1732 const TypeInt* sizetype, Node* ctrl) { 1733 uint shift = exact_log2(type2aelembytes(elembt)); 1734 ciKlass* arytype_klass = _gvn.type(ary)->is_aryptr()->klass(); 1735 if (arytype_klass->is_value_array_klass()) { 1736 ciValueArrayKlass* vak = arytype_klass->as_value_array_klass(); 1737 shift = vak->log2_element_size(); 1738 } 1739 uint header = arrayOopDesc::base_offset_in_bytes(elembt); 1740 1741 // short-circuit a common case (saves lots of confusing waste motion) 1742 jint idx_con = find_int_con(idx, -1); 1743 if (idx_con >= 0) { 1744 intptr_t offset = header + ((intptr_t)idx_con << shift); 1745 return basic_plus_adr(ary, offset); 1746 } 1747 1748 // must be correct type for alignment purposes 1749 Node* base = basic_plus_adr(ary, header); 1750 idx = Compile::conv_I2X_index(&_gvn, idx, sizetype, ctrl); 1751 Node* scale = _gvn.transform( new LShiftXNode(idx, intcon(shift)) ); 1752 return basic_plus_adr(ary, base, scale); 1753 } 1754 1755 //-------------------------load_array_element------------------------- 1756 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) { 1757 const Type* elemtype = arytype->elem(); 1758 BasicType elembt = elemtype->array_element_basic_type(); 1759 assert(elembt != T_VALUETYPE, "value types are not supported by this method"); 1760 Node* adr = array_element_address(ary, idx, elembt, arytype->size()); 1761 if (elembt == T_NARROWOOP) { 1762 elembt = T_OBJECT; // To satisfy switch in LoadNode::make() 1763 } 1764 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype, MemNode::unordered); 1765 return ld; 1766 } 1767 1768 //-------------------------set_arguments_for_java_call------------------------- 1769 // Arguments (pre-popped from the stack) are taken from the JVMS. 1770 void GraphKit::set_arguments_for_java_call(CallJavaNode* call) { 1771 // Add the call arguments: 1772 const TypeTuple* domain = call->tf()->domain_sig(); 1773 uint nargs = domain->cnt(); 1774 for (uint i = TypeFunc::Parms, idx = TypeFunc::Parms; i < nargs; i++) { 1775 Node* arg = argument(i-TypeFunc::Parms); 1776 const Type* t = domain->field_at(i); 1777 if (arg->is_ValueType()) { 1778 assert(t->is_oopptr()->can_be_value_type(), "wrong argument type"); 1779 ValueTypeNode* vt = arg->as_ValueType(); 1780 if (ValueTypePassFieldsAsArgs) { 1781 // We don't pass value type arguments by reference but instead 1782 // pass each field of the value type 1783 idx += vt->pass_fields(call, idx, *this); 1784 // If a value type argument is passed as fields, attach the Method* to the call site 1785 // to be able to access the extended signature later via attached_method_before_pc(). 1786 // For example, see CompiledMethod::preserve_callee_argument_oops(). 1787 call->set_override_symbolic_info(true); 1788 continue; 1789 } else { 1790 // Pass value type argument via oop to callee 1791 arg = vt->allocate(this)->get_oop(); 1792 } 1793 } else if (t->is_valuetypeptr()) { 1794 ciMethod* declared_method = method()->get_method_at_bci(bci()); 1795 if (arg->is_ValueTypePtr()) { 1796 // We are calling an Object method with a value type receiver 1797 ValueTypePtrNode* vt = arg->isa_ValueTypePtr(); 1798 assert(i == TypeFunc::Parms && !declared_method->is_static(), "argument must be receiver"); 1799 assert(vt->is_allocated(&gvn()), "argument must be allocated"); 1800 arg = vt->get_oop(); 1801 } else { 1802 // Constant null passed for a value type argument 1803 assert(arg->bottom_type()->remove_speculative() == TypePtr::NULL_PTR, "Anything other than null?"); 1804 int arg_size = declared_method->signature()->arg_size_for_bc(java_bc()); 1805 inc_sp(arg_size); // restore arguments 1806 uncommon_trap(Deoptimization::Reason_null_check, Deoptimization::Action_none); 1807 return; 1808 } 1809 } 1810 call->init_req(idx, arg); 1811 idx++; 1812 } 1813 } 1814 1815 //---------------------------set_edges_for_java_call--------------------------- 1816 // Connect a newly created call into the current JVMS. 1817 // A return value node (if any) is returned from set_edges_for_java_call. 1818 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) { 1819 1820 // Add the predefined inputs: 1821 call->init_req( TypeFunc::Control, control() ); 1822 call->init_req( TypeFunc::I_O , i_o() ); 1823 call->init_req( TypeFunc::Memory , reset_memory() ); 1824 call->init_req( TypeFunc::FramePtr, frameptr() ); 1825 call->init_req( TypeFunc::ReturnAdr, top() ); 1826 1827 add_safepoint_edges(call, must_throw); 1828 1829 Node* xcall = _gvn.transform(call); 1830 1831 if (xcall == top()) { 1832 set_control(top()); 1833 return; 1834 } 1835 assert(xcall == call, "call identity is stable"); 1836 1837 // Re-use the current map to produce the result. 1838 1839 set_control(_gvn.transform(new ProjNode(call, TypeFunc::Control))); 1840 set_i_o( _gvn.transform(new ProjNode(call, TypeFunc::I_O , separate_io_proj))); 1841 set_all_memory_call(xcall, separate_io_proj); 1842 1843 //return xcall; // no need, caller already has it 1844 } 1845 1846 Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj, bool deoptimize) { 1847 if (stopped()) return top(); // maybe the call folded up? 1848 1849 // Note: Since any out-of-line call can produce an exception, 1850 // we always insert an I_O projection from the call into the result. 1851 1852 make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj, deoptimize); 1853 1854 if (separate_io_proj) { 1855 // The caller requested separate projections be used by the fall 1856 // through and exceptional paths, so replace the projections for 1857 // the fall through path. 1858 set_i_o(_gvn.transform( new ProjNode(call, TypeFunc::I_O) )); 1859 set_all_memory(_gvn.transform( new ProjNode(call, TypeFunc::Memory) )); 1860 } 1861 1862 // Capture the return value, if any. 1863 Node* ret; 1864 if (call->method() == NULL || 1865 call->method()->return_type()->basic_type() == T_VOID) { 1866 ret = top(); 1867 } else { 1868 if (!call->tf()->returns_value_type_as_fields()) { 1869 ret = _gvn.transform(new ProjNode(call, TypeFunc::Parms)); 1870 } else { 1871 // Return of multiple values (value type fields): we create a 1872 // ValueType node, each field is a projection from the call. 1873 const TypeTuple* range_sig = call->tf()->range_sig(); 1874 const Type* t = range_sig->field_at(TypeFunc::Parms); 1875 assert(t->is_valuetypeptr(), "only value types for multiple return values"); 1876 ciValueKlass* vk = t->value_klass(); 1877 ret = ValueTypeNode::make_from_multi(this, call, vk, TypeFunc::Parms+1, false); 1878 } 1879 } 1880 1881 return ret; 1882 } 1883 1884 //--------------------set_predefined_input_for_runtime_call-------------------- 1885 // Reading and setting the memory state is way conservative here. 1886 // The real problem is that I am not doing real Type analysis on memory, 1887 // so I cannot distinguish card mark stores from other stores. Across a GC 1888 // point the Store Barrier and the card mark memory has to agree. I cannot 1889 // have a card mark store and its barrier split across the GC point from 1890 // either above or below. Here I get that to happen by reading ALL of memory. 1891 // A better answer would be to separate out card marks from other memory. 1892 // For now, return the input memory state, so that it can be reused 1893 // after the call, if this call has restricted memory effects. 1894 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) { 1895 // Set fixed predefined input arguments 1896 Node* memory = reset_memory(); 1897 call->init_req( TypeFunc::Control, control() ); 1898 call->init_req( TypeFunc::I_O, top() ); // does no i/o 1899 call->init_req( TypeFunc::Memory, memory ); // may gc ptrs 1900 call->init_req( TypeFunc::FramePtr, frameptr() ); 1901 call->init_req( TypeFunc::ReturnAdr, top() ); 1902 return memory; 1903 } 1904 1905 //-------------------set_predefined_output_for_runtime_call-------------------- 1906 // Set control and memory (not i_o) from the call. 1907 // If keep_mem is not NULL, use it for the output state, 1908 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM. 1909 // If hook_mem is NULL, this call produces no memory effects at all. 1910 // If hook_mem is a Java-visible memory slice (such as arraycopy operands), 1911 // then only that memory slice is taken from the call. 1912 // In the last case, we must put an appropriate memory barrier before 1913 // the call, so as to create the correct anti-dependencies on loads 1914 // preceding the call. 1915 void GraphKit::set_predefined_output_for_runtime_call(Node* call, 1916 Node* keep_mem, 1917 const TypePtr* hook_mem) { 1918 // no i/o 1919 set_control(_gvn.transform( new ProjNode(call,TypeFunc::Control) )); 1920 if (keep_mem) { 1921 // First clone the existing memory state 1922 set_all_memory(keep_mem); 1923 if (hook_mem != NULL) { 1924 // Make memory for the call 1925 Node* mem = _gvn.transform( new ProjNode(call, TypeFunc::Memory) ); 1926 // Set the RawPtr memory state only. This covers all the heap top/GC stuff 1927 // We also use hook_mem to extract specific effects from arraycopy stubs. 1928 set_memory(mem, hook_mem); 1929 } 1930 // ...else the call has NO memory effects. 1931 1932 // Make sure the call advertises its memory effects precisely. 1933 // This lets us build accurate anti-dependences in gcm.cpp. 1934 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem), 1935 "call node must be constructed correctly"); 1936 } else { 1937 assert(hook_mem == NULL, ""); 1938 // This is not a "slow path" call; all memory comes from the call. 1939 set_all_memory_call(call); 1940 } 1941 } 1942 1943 1944 // Replace the call with the current state of the kit. 1945 void GraphKit::replace_call(CallNode* call, Node* result, bool do_replaced_nodes) { 1946 JVMState* ejvms = NULL; 1947 if (has_exceptions()) { 1948 ejvms = transfer_exceptions_into_jvms(); 1949 } 1950 1951 ReplacedNodes replaced_nodes = map()->replaced_nodes(); 1952 ReplacedNodes replaced_nodes_exception; 1953 Node* ex_ctl = top(); 1954 1955 SafePointNode* final_state = stop(); 1956 1957 // Find all the needed outputs of this call 1958 CallProjections* callprojs = call->extract_projections(true); 1959 1960 Node* init_mem = call->in(TypeFunc::Memory); 1961 Node* final_mem = final_state->in(TypeFunc::Memory); 1962 Node* final_ctl = final_state->in(TypeFunc::Control); 1963 Node* final_io = final_state->in(TypeFunc::I_O); 1964 1965 // Replace all the old call edges with the edges from the inlining result 1966 if (callprojs->fallthrough_catchproj != NULL) { 1967 C->gvn_replace_by(callprojs->fallthrough_catchproj, final_ctl); 1968 } 1969 if (callprojs->fallthrough_memproj != NULL) { 1970 if (final_mem->is_MergeMem()) { 1971 // Parser's exits MergeMem was not transformed but may be optimized 1972 final_mem = _gvn.transform(final_mem); 1973 } 1974 C->gvn_replace_by(callprojs->fallthrough_memproj, final_mem); 1975 } 1976 if (callprojs->fallthrough_ioproj != NULL) { 1977 C->gvn_replace_by(callprojs->fallthrough_ioproj, final_io); 1978 } 1979 1980 // Replace the result with the new result if it exists and is used 1981 if (callprojs->resproj[0] != NULL && result != NULL) { 1982 assert(callprojs->nb_resproj == 1, "unexpected number of results"); 1983 C->gvn_replace_by(callprojs->resproj[0], result); 1984 } 1985 1986 if (ejvms == NULL) { 1987 // No exception edges to simply kill off those paths 1988 if (callprojs->catchall_catchproj != NULL) { 1989 C->gvn_replace_by(callprojs->catchall_catchproj, C->top()); 1990 } 1991 if (callprojs->catchall_memproj != NULL) { 1992 C->gvn_replace_by(callprojs->catchall_memproj, C->top()); 1993 } 1994 if (callprojs->catchall_ioproj != NULL) { 1995 C->gvn_replace_by(callprojs->catchall_ioproj, C->top()); 1996 } 1997 // Replace the old exception object with top 1998 if (callprojs->exobj != NULL) { 1999 C->gvn_replace_by(callprojs->exobj, C->top()); 2000 } 2001 } else { 2002 GraphKit ekit(ejvms); 2003 2004 // Load my combined exception state into the kit, with all phis transformed: 2005 SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states(); 2006 replaced_nodes_exception = ex_map->replaced_nodes(); 2007 2008 Node* ex_oop = ekit.use_exception_state(ex_map); 2009 2010 if (callprojs->catchall_catchproj != NULL) { 2011 C->gvn_replace_by(callprojs->catchall_catchproj, ekit.control()); 2012 ex_ctl = ekit.control(); 2013 } 2014 if (callprojs->catchall_memproj != NULL) { 2015 C->gvn_replace_by(callprojs->catchall_memproj, ekit.reset_memory()); 2016 } 2017 if (callprojs->catchall_ioproj != NULL) { 2018 C->gvn_replace_by(callprojs->catchall_ioproj, ekit.i_o()); 2019 } 2020 2021 // Replace the old exception object with the newly created one 2022 if (callprojs->exobj != NULL) { 2023 C->gvn_replace_by(callprojs->exobj, ex_oop); 2024 } 2025 } 2026 2027 // Disconnect the call from the graph 2028 call->disconnect_inputs(NULL, C); 2029 C->gvn_replace_by(call, C->top()); 2030 2031 // Clean up any MergeMems that feed other MergeMems since the 2032 // optimizer doesn't like that. 2033 if (final_mem->is_MergeMem()) { 2034 Node_List wl; 2035 for (SimpleDUIterator i(final_mem); i.has_next(); i.next()) { 2036 Node* m = i.get(); 2037 if (m->is_MergeMem() && !wl.contains(m)) { 2038 wl.push(m); 2039 } 2040 } 2041 while (wl.size() > 0) { 2042 _gvn.transform(wl.pop()); 2043 } 2044 } 2045 2046 if (callprojs->fallthrough_catchproj != NULL && !final_ctl->is_top() && do_replaced_nodes) { 2047 replaced_nodes.apply(C, final_ctl); 2048 } 2049 if (!ex_ctl->is_top() && do_replaced_nodes) { 2050 replaced_nodes_exception.apply(C, ex_ctl); 2051 } 2052 } 2053 2054 2055 //------------------------------increment_counter------------------------------ 2056 // for statistics: increment a VM counter by 1 2057 2058 void GraphKit::increment_counter(address counter_addr) { 2059 Node* adr1 = makecon(TypeRawPtr::make(counter_addr)); 2060 increment_counter(adr1); 2061 } 2062 2063 void GraphKit::increment_counter(Node* counter_addr) { 2064 int adr_type = Compile::AliasIdxRaw; 2065 Node* ctrl = control(); 2066 Node* cnt = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type, MemNode::unordered); 2067 Node* incr = _gvn.transform(new AddINode(cnt, _gvn.intcon(1))); 2068 store_to_memory(ctrl, counter_addr, incr, T_INT, adr_type, MemNode::unordered); 2069 } 2070 2071 2072 //------------------------------uncommon_trap---------------------------------- 2073 // Bail out to the interpreter in mid-method. Implemented by calling the 2074 // uncommon_trap blob. This helper function inserts a runtime call with the 2075 // right debug info. 2076 void GraphKit::uncommon_trap(int trap_request, 2077 ciKlass* klass, const char* comment, 2078 bool must_throw, 2079 bool keep_exact_action) { 2080 if (failing()) stop(); 2081 if (stopped()) return; // trap reachable? 2082 2083 // Note: If ProfileTraps is true, and if a deopt. actually 2084 // occurs here, the runtime will make sure an MDO exists. There is 2085 // no need to call method()->ensure_method_data() at this point. 2086 2087 // Set the stack pointer to the right value for reexecution: 2088 set_sp(reexecute_sp()); 2089 2090 #ifdef ASSERT 2091 if (!must_throw) { 2092 // Make sure the stack has at least enough depth to execute 2093 // the current bytecode. 2094 int inputs, ignored_depth; 2095 if (compute_stack_effects(inputs, ignored_depth)) { 2096 assert(sp() >= inputs, "must have enough JVMS stack to execute %s: sp=%d, inputs=%d", 2097 Bytecodes::name(java_bc()), sp(), inputs); 2098 } 2099 } 2100 #endif 2101 2102 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); 2103 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); 2104 2105 switch (action) { 2106 case Deoptimization::Action_maybe_recompile: 2107 case Deoptimization::Action_reinterpret: 2108 // Temporary fix for 6529811 to allow virtual calls to be sure they 2109 // get the chance to go from mono->bi->mega 2110 if (!keep_exact_action && 2111 Deoptimization::trap_request_index(trap_request) < 0 && 2112 too_many_recompiles(reason)) { 2113 // This BCI is causing too many recompilations. 2114 if (C->log() != NULL) { 2115 C->log()->elem("observe that='trap_action_change' reason='%s' from='%s' to='none'", 2116 Deoptimization::trap_reason_name(reason), 2117 Deoptimization::trap_action_name(action)); 2118 } 2119 action = Deoptimization::Action_none; 2120 trap_request = Deoptimization::make_trap_request(reason, action); 2121 } else { 2122 C->set_trap_can_recompile(true); 2123 } 2124 break; 2125 case Deoptimization::Action_make_not_entrant: 2126 C->set_trap_can_recompile(true); 2127 break; 2128 case Deoptimization::Action_none: 2129 case Deoptimization::Action_make_not_compilable: 2130 break; 2131 default: 2132 #ifdef ASSERT 2133 fatal("unknown action %d: %s", action, Deoptimization::trap_action_name(action)); 2134 #endif 2135 break; 2136 } 2137 2138 if (TraceOptoParse) { 2139 char buf[100]; 2140 tty->print_cr("Uncommon trap %s at bci:%d", 2141 Deoptimization::format_trap_request(buf, sizeof(buf), 2142 trap_request), bci()); 2143 } 2144 2145 CompileLog* log = C->log(); 2146 if (log != NULL) { 2147 int kid = (klass == NULL)? -1: log->identify(klass); 2148 log->begin_elem("uncommon_trap bci='%d'", bci()); 2149 char buf[100]; 2150 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), 2151 trap_request)); 2152 if (kid >= 0) log->print(" klass='%d'", kid); 2153 if (comment != NULL) log->print(" comment='%s'", comment); 2154 log->end_elem(); 2155 } 2156 2157 // Make sure any guarding test views this path as very unlikely 2158 Node *i0 = control()->in(0); 2159 if (i0 != NULL && i0->is_If()) { // Found a guarding if test? 2160 IfNode *iff = i0->as_If(); 2161 float f = iff->_prob; // Get prob 2162 if (control()->Opcode() == Op_IfTrue) { 2163 if (f > PROB_UNLIKELY_MAG(4)) 2164 iff->_prob = PROB_MIN; 2165 } else { 2166 if (f < PROB_LIKELY_MAG(4)) 2167 iff->_prob = PROB_MAX; 2168 } 2169 } 2170 2171 // Clear out dead values from the debug info. 2172 kill_dead_locals(); 2173 2174 // Now insert the uncommon trap subroutine call 2175 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point(); 2176 const TypePtr* no_memory_effects = NULL; 2177 // Pass the index of the class to be loaded 2178 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON | 2179 (must_throw ? RC_MUST_THROW : 0), 2180 OptoRuntime::uncommon_trap_Type(), 2181 call_addr, "uncommon_trap", no_memory_effects, 2182 intcon(trap_request)); 2183 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request, 2184 "must extract request correctly from the graph"); 2185 assert(trap_request != 0, "zero value reserved by uncommon_trap_request"); 2186 2187 call->set_req(TypeFunc::ReturnAdr, returnadr()); 2188 // The debug info is the only real input to this call. 2189 2190 // Halt-and-catch fire here. The above call should never return! 2191 HaltNode* halt = new HaltNode(control(), frameptr()); 2192 _gvn.set_type_bottom(halt); 2193 root()->add_req(halt); 2194 2195 stop_and_kill_map(); 2196 } 2197 2198 2199 //--------------------------just_allocated_object------------------------------ 2200 // Report the object that was just allocated. 2201 // It must be the case that there are no intervening safepoints. 2202 // We use this to determine if an object is so "fresh" that 2203 // it does not require card marks. 2204 Node* GraphKit::just_allocated_object(Node* current_control) { 2205 if (C->recent_alloc_ctl() == current_control) 2206 return C->recent_alloc_obj(); 2207 return NULL; 2208 } 2209 2210 2211 void GraphKit::round_double_arguments(ciMethod* dest_method) { 2212 // (Note: TypeFunc::make has a cache that makes this fast.) 2213 const TypeFunc* tf = TypeFunc::make(dest_method); 2214 int nargs = tf->domain_sig()->cnt() - TypeFunc::Parms; 2215 for (int j = 0; j < nargs; j++) { 2216 const Type *targ = tf->domain_sig()->field_at(j + TypeFunc::Parms); 2217 if( targ->basic_type() == T_DOUBLE ) { 2218 // If any parameters are doubles, they must be rounded before 2219 // the call, dstore_rounding does gvn.transform 2220 Node *arg = argument(j); 2221 arg = dstore_rounding(arg); 2222 set_argument(j, arg); 2223 } 2224 } 2225 } 2226 2227 /** 2228 * Record profiling data exact_kls for Node n with the type system so 2229 * that it can propagate it (speculation) 2230 * 2231 * @param n node that the type applies to 2232 * @param exact_kls type from profiling 2233 * @param maybe_null did profiling see null? 2234 * 2235 * @return node with improved type 2236 */ 2237 Node* GraphKit::record_profile_for_speculation(Node* n, ciKlass* exact_kls, ProfilePtrKind ptr_kind) { 2238 const Type* current_type = _gvn.type(n); 2239 assert(UseTypeSpeculation, "type speculation must be on"); 2240 2241 const TypePtr* speculative = current_type->speculative(); 2242 2243 // Should the klass from the profile be recorded in the speculative type? 2244 if (current_type->would_improve_type(exact_kls, jvms()->depth())) { 2245 const TypeKlassPtr* tklass = TypeKlassPtr::make(exact_kls); 2246 const TypeOopPtr* xtype = tklass->as_instance_type(); 2247 assert(xtype->klass_is_exact(), "Should be exact"); 2248 // Any reason to believe n is not null (from this profiling or a previous one)? 2249 assert(ptr_kind != ProfileAlwaysNull, "impossible here"); 2250 const TypePtr* ptr = (ptr_kind == ProfileMaybeNull && current_type->speculative_maybe_null()) ? TypePtr::BOTTOM : TypePtr::NOTNULL; 2251 // record the new speculative type's depth 2252 speculative = xtype->cast_to_ptr_type(ptr->ptr())->is_ptr(); 2253 speculative = speculative->with_inline_depth(jvms()->depth()); 2254 } else if (current_type->would_improve_ptr(ptr_kind)) { 2255 // Profiling report that null was never seen so we can change the 2256 // speculative type to non null ptr. 2257 if (ptr_kind == ProfileAlwaysNull) { 2258 speculative = TypePtr::NULL_PTR; 2259 } else { 2260 assert(ptr_kind == ProfileNeverNull, "nothing else is an improvement"); 2261 const TypePtr* ptr = TypePtr::NOTNULL; 2262 if (speculative != NULL) { 2263 speculative = speculative->cast_to_ptr_type(ptr->ptr())->is_ptr(); 2264 } else { 2265 speculative = ptr; 2266 } 2267 } 2268 } 2269 2270 if (speculative != current_type->speculative()) { 2271 // Build a type with a speculative type (what we think we know 2272 // about the type but will need a guard when we use it) 2273 const TypeOopPtr* spec_type = TypeOopPtr::make(TypePtr::BotPTR, Type::Offset::bottom, TypeOopPtr::InstanceBot, speculative); 2274 // We're changing the type, we need a new CheckCast node to carry 2275 // the new type. The new type depends on the control: what 2276 // profiling tells us is only valid from here as far as we can 2277 // tell. 2278 Node* cast = new CheckCastPPNode(control(), n, current_type->remove_speculative()->join_speculative(spec_type)); 2279 cast = _gvn.transform(cast); 2280 replace_in_map(n, cast); 2281 n = cast; 2282 } 2283 2284 return n; 2285 } 2286 2287 /** 2288 * Record profiling data from receiver profiling at an invoke with the 2289 * type system so that it can propagate it (speculation) 2290 * 2291 * @param n receiver node 2292 * 2293 * @return node with improved type 2294 */ 2295 Node* GraphKit::record_profiled_receiver_for_speculation(Node* n) { 2296 if (!UseTypeSpeculation) { 2297 return n; 2298 } 2299 ciKlass* exact_kls = profile_has_unique_klass(); 2300 ProfilePtrKind ptr_kind = ProfileMaybeNull; 2301 if ((java_bc() == Bytecodes::_checkcast || 2302 java_bc() == Bytecodes::_instanceof || 2303 java_bc() == Bytecodes::_aastore) && 2304 method()->method_data()->is_mature()) { 2305 ciProfileData* data = method()->method_data()->bci_to_data(bci()); 2306 if (data != NULL) { 2307 if (!data->as_BitData()->null_seen()) { 2308 ptr_kind = ProfileNeverNull; 2309 } else { 2310 assert(data->is_ReceiverTypeData(), "bad profile data type"); 2311 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData(); 2312 uint i = 0; 2313 for (; i < call->row_limit(); i++) { 2314 ciKlass* receiver = call->receiver(i); 2315 if (receiver != NULL) { 2316 break; 2317 } 2318 } 2319 ptr_kind = (i == call->row_limit()) ? ProfileAlwaysNull : ProfileMaybeNull; 2320 } 2321 } 2322 } 2323 return record_profile_for_speculation(n, exact_kls, ptr_kind); 2324 } 2325 2326 /** 2327 * Record profiling data from argument profiling at an invoke with the 2328 * type system so that it can propagate it (speculation) 2329 * 2330 * @param dest_method target method for the call 2331 * @param bc what invoke bytecode is this? 2332 */ 2333 void GraphKit::record_profiled_arguments_for_speculation(ciMethod* dest_method, Bytecodes::Code bc) { 2334 if (!UseTypeSpeculation) { 2335 return; 2336 } 2337 const TypeFunc* tf = TypeFunc::make(dest_method); 2338 int nargs = tf->domain_sig()->cnt() - TypeFunc::Parms; 2339 int skip = Bytecodes::has_receiver(bc) ? 1 : 0; 2340 for (int j = skip, i = 0; j < nargs && i < TypeProfileArgsLimit; j++) { 2341 const Type *targ = tf->domain_sig()->field_at(j + TypeFunc::Parms); 2342 if (targ->isa_oopptr()) { 2343 ProfilePtrKind ptr_kind = ProfileMaybeNull; 2344 ciKlass* better_type = NULL; 2345 if (method()->argument_profiled_type(bci(), i, better_type, ptr_kind)) { 2346 record_profile_for_speculation(argument(j), better_type, ptr_kind); 2347 } 2348 i++; 2349 } 2350 } 2351 } 2352 2353 /** 2354 * Record profiling data from parameter profiling at an invoke with 2355 * the type system so that it can propagate it (speculation) 2356 */ 2357 void GraphKit::record_profiled_parameters_for_speculation() { 2358 if (!UseTypeSpeculation) { 2359 return; 2360 } 2361 for (int i = 0, j = 0; i < method()->arg_size() ; i++) { 2362 if (_gvn.type(local(i))->isa_oopptr()) { 2363 ProfilePtrKind ptr_kind = ProfileMaybeNull; 2364 ciKlass* better_type = NULL; 2365 if (method()->parameter_profiled_type(j, better_type, ptr_kind)) { 2366 record_profile_for_speculation(local(i), better_type, ptr_kind); 2367 } 2368 j++; 2369 } 2370 } 2371 } 2372 2373 /** 2374 * Record profiling data from return value profiling at an invoke with 2375 * the type system so that it can propagate it (speculation) 2376 */ 2377 void GraphKit::record_profiled_return_for_speculation() { 2378 if (!UseTypeSpeculation) { 2379 return; 2380 } 2381 ProfilePtrKind ptr_kind = ProfileMaybeNull; 2382 ciKlass* better_type = NULL; 2383 if (method()->return_profiled_type(bci(), better_type, ptr_kind)) { 2384 // If profiling reports a single type for the return value, 2385 // feed it to the type system so it can propagate it as a 2386 // speculative type 2387 record_profile_for_speculation(stack(sp()-1), better_type, ptr_kind); 2388 } 2389 } 2390 2391 void GraphKit::round_double_result(ciMethod* dest_method) { 2392 // A non-strict method may return a double value which has an extended 2393 // exponent, but this must not be visible in a caller which is 'strict' 2394 // If a strict caller invokes a non-strict callee, round a double result 2395 2396 BasicType result_type = dest_method->return_type()->basic_type(); 2397 assert( method() != NULL, "must have caller context"); 2398 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) { 2399 // Destination method's return value is on top of stack 2400 // dstore_rounding() does gvn.transform 2401 Node *result = pop_pair(); 2402 result = dstore_rounding(result); 2403 push_pair(result); 2404 } 2405 } 2406 2407 // rounding for strict float precision conformance 2408 Node* GraphKit::precision_rounding(Node* n) { 2409 return UseStrictFP && _method->flags().is_strict() 2410 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding 2411 ? _gvn.transform( new RoundFloatNode(0, n) ) 2412 : n; 2413 } 2414 2415 // rounding for strict double precision conformance 2416 Node* GraphKit::dprecision_rounding(Node *n) { 2417 return UseStrictFP && _method->flags().is_strict() 2418 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding 2419 ? _gvn.transform( new RoundDoubleNode(0, n) ) 2420 : n; 2421 } 2422 2423 // rounding for non-strict double stores 2424 Node* GraphKit::dstore_rounding(Node* n) { 2425 return Matcher::strict_fp_requires_explicit_rounding 2426 && UseSSE <= 1 2427 ? _gvn.transform( new RoundDoubleNode(0, n) ) 2428 : n; 2429 } 2430 2431 //============================================================================= 2432 // Generate a fast path/slow path idiom. Graph looks like: 2433 // [foo] indicates that 'foo' is a parameter 2434 // 2435 // [in] NULL 2436 // \ / 2437 // CmpP 2438 // Bool ne 2439 // If 2440 // / \ 2441 // True False-<2> 2442 // / | 2443 // / cast_not_null 2444 // Load | | ^ 2445 // [fast_test] | | 2446 // gvn to opt_test | | 2447 // / \ | <1> 2448 // True False | 2449 // | \\ | 2450 // [slow_call] \[fast_result] 2451 // Ctl Val \ \ 2452 // | \ \ 2453 // Catch <1> \ \ 2454 // / \ ^ \ \ 2455 // Ex No_Ex | \ \ 2456 // | \ \ | \ <2> \ 2457 // ... \ [slow_res] | | \ [null_result] 2458 // \ \--+--+--- | | 2459 // \ | / \ | / 2460 // --------Region Phi 2461 // 2462 //============================================================================= 2463 // Code is structured as a series of driver functions all called 'do_XXX' that 2464 // call a set of helper functions. Helper functions first, then drivers. 2465 2466 //------------------------------null_check_oop--------------------------------- 2467 // Null check oop. Set null-path control into Region in slot 3. 2468 // Make a cast-not-nullness use the other not-null control. Return cast. 2469 Node* GraphKit::null_check_oop(Node* value, Node* *null_control, 2470 bool never_see_null, 2471 bool safe_for_replace, 2472 bool speculative) { 2473 // Initial NULL check taken path 2474 (*null_control) = top(); 2475 Node* cast = null_check_common(value, T_OBJECT, false, null_control, speculative); 2476 2477 // Generate uncommon_trap: 2478 if (never_see_null && (*null_control) != top()) { 2479 // If we see an unexpected null at a check-cast we record it and force a 2480 // recompile; the offending check-cast will be compiled to handle NULLs. 2481 // If we see more than one offending BCI, then all checkcasts in the 2482 // method will be compiled to handle NULLs. 2483 PreserveJVMState pjvms(this); 2484 set_control(*null_control); 2485 replace_in_map(value, null()); 2486 Deoptimization::DeoptReason reason = Deoptimization::reason_null_check(speculative); 2487 uncommon_trap(reason, 2488 Deoptimization::Action_make_not_entrant); 2489 (*null_control) = top(); // NULL path is dead 2490 } 2491 if ((*null_control) == top() && safe_for_replace) { 2492 replace_in_map(value, cast); 2493 } 2494 2495 // Cast away null-ness on the result 2496 return cast; 2497 } 2498 2499 //------------------------------opt_iff---------------------------------------- 2500 // Optimize the fast-check IfNode. Set the fast-path region slot 2. 2501 // Return slow-path control. 2502 Node* GraphKit::opt_iff(Node* region, Node* iff) { 2503 IfNode *opt_iff = _gvn.transform(iff)->as_If(); 2504 2505 // Fast path taken; set region slot 2 2506 Node *fast_taken = _gvn.transform( new IfFalseNode(opt_iff) ); 2507 region->init_req(2,fast_taken); // Capture fast-control 2508 2509 // Fast path not-taken, i.e. slow path 2510 Node *slow_taken = _gvn.transform( new IfTrueNode(opt_iff) ); 2511 return slow_taken; 2512 } 2513 2514 //-----------------------------make_runtime_call------------------------------- 2515 Node* GraphKit::make_runtime_call(int flags, 2516 const TypeFunc* call_type, address call_addr, 2517 const char* call_name, 2518 const TypePtr* adr_type, 2519 // The following parms are all optional. 2520 // The first NULL ends the list. 2521 Node* parm0, Node* parm1, 2522 Node* parm2, Node* parm3, 2523 Node* parm4, Node* parm5, 2524 Node* parm6, Node* parm7) { 2525 // Slow-path call 2526 bool is_leaf = !(flags & RC_NO_LEAF); 2527 bool has_io = (!is_leaf && !(flags & RC_NO_IO)); 2528 if (call_name == NULL) { 2529 assert(!is_leaf, "must supply name for leaf"); 2530 call_name = OptoRuntime::stub_name(call_addr); 2531 } 2532 CallNode* call; 2533 if (!is_leaf) { 2534 call = new CallStaticJavaNode(call_type, call_addr, call_name, 2535 bci(), adr_type); 2536 } else if (flags & RC_NO_FP) { 2537 call = new CallLeafNoFPNode(call_type, call_addr, call_name, adr_type); 2538 } else { 2539 call = new CallLeafNode(call_type, call_addr, call_name, adr_type); 2540 } 2541 2542 // The following is similar to set_edges_for_java_call, 2543 // except that the memory effects of the call are restricted to AliasIdxRaw. 2544 2545 // Slow path call has no side-effects, uses few values 2546 bool wide_in = !(flags & RC_NARROW_MEM); 2547 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot); 2548 2549 Node* prev_mem = NULL; 2550 if (wide_in) { 2551 prev_mem = set_predefined_input_for_runtime_call(call); 2552 } else { 2553 assert(!wide_out, "narrow in => narrow out"); 2554 Node* narrow_mem = memory(adr_type); 2555 prev_mem = reset_memory(); 2556 map()->set_memory(narrow_mem); 2557 set_predefined_input_for_runtime_call(call); 2558 } 2559 2560 // Hook each parm in order. Stop looking at the first NULL. 2561 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0); 2562 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1); 2563 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2); 2564 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3); 2565 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4); 2566 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5); 2567 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6); 2568 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7); 2569 /* close each nested if ===> */ } } } } } } } } 2570 assert(call->in(call->req()-1) != NULL, "must initialize all parms"); 2571 2572 if (!is_leaf) { 2573 // Non-leaves can block and take safepoints: 2574 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0)); 2575 } 2576 // Non-leaves can throw exceptions: 2577 if (has_io) { 2578 call->set_req(TypeFunc::I_O, i_o()); 2579 } 2580 2581 if (flags & RC_UNCOMMON) { 2582 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency. 2583 // (An "if" probability corresponds roughly to an unconditional count. 2584 // Sort of.) 2585 call->set_cnt(PROB_UNLIKELY_MAG(4)); 2586 } 2587 2588 Node* c = _gvn.transform(call); 2589 assert(c == call, "cannot disappear"); 2590 2591 if (wide_out) { 2592 // Slow path call has full side-effects. 2593 set_predefined_output_for_runtime_call(call); 2594 } else { 2595 // Slow path call has few side-effects, and/or sets few values. 2596 set_predefined_output_for_runtime_call(call, prev_mem, adr_type); 2597 } 2598 2599 if (has_io) { 2600 set_i_o(_gvn.transform(new ProjNode(call, TypeFunc::I_O))); 2601 } 2602 return call; 2603 2604 } 2605 2606 //------------------------------merge_memory----------------------------------- 2607 // Merge memory from one path into the current memory state. 2608 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) { 2609 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) { 2610 Node* old_slice = mms.force_memory(); 2611 Node* new_slice = mms.memory2(); 2612 if (old_slice != new_slice) { 2613 PhiNode* phi; 2614 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) { 2615 if (mms.is_empty()) { 2616 // clone base memory Phi's inputs for this memory slice 2617 assert(old_slice == mms.base_memory(), "sanity"); 2618 phi = PhiNode::make(region, NULL, Type::MEMORY, mms.adr_type(C)); 2619 _gvn.set_type(phi, Type::MEMORY); 2620 for (uint i = 1; i < phi->req(); i++) { 2621 phi->init_req(i, old_slice->in(i)); 2622 } 2623 } else { 2624 phi = old_slice->as_Phi(); // Phi was generated already 2625 } 2626 } else { 2627 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C)); 2628 _gvn.set_type(phi, Type::MEMORY); 2629 } 2630 phi->set_req(new_path, new_slice); 2631 mms.set_memory(phi); 2632 } 2633 } 2634 } 2635 2636 //------------------------------make_slow_call_ex------------------------------ 2637 // Make the exception handler hookups for the slow call 2638 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj, bool deoptimize) { 2639 if (stopped()) return; 2640 2641 // Make a catch node with just two handlers: fall-through and catch-all 2642 Node* i_o = _gvn.transform( new ProjNode(call, TypeFunc::I_O, separate_io_proj) ); 2643 Node* catc = _gvn.transform( new CatchNode(control(), i_o, 2) ); 2644 Node* norm = _gvn.transform( new CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) ); 2645 Node* excp = _gvn.transform( new CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) ); 2646 2647 { PreserveJVMState pjvms(this); 2648 set_control(excp); 2649 set_i_o(i_o); 2650 2651 if (excp != top()) { 2652 if (deoptimize) { 2653 // Deoptimize if an exception is caught. Don't construct exception state in this case. 2654 uncommon_trap(Deoptimization::Reason_unhandled, 2655 Deoptimization::Action_none); 2656 } else { 2657 // Create an exception state also. 2658 // Use an exact type if the caller has a specific exception. 2659 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull); 2660 Node* ex_oop = new CreateExNode(ex_type, control(), i_o); 2661 add_exception_state(make_exception_state(_gvn.transform(ex_oop))); 2662 } 2663 } 2664 } 2665 2666 // Get the no-exception control from the CatchNode. 2667 set_control(norm); 2668 } 2669 2670 static IfNode* gen_subtype_check_compare(Node* ctrl, Node* in1, Node* in2, BoolTest::mask test, float p, PhaseGVN* gvn, BasicType bt) { 2671 Node* cmp = NULL; 2672 switch(bt) { 2673 case T_INT: cmp = new CmpINode(in1, in2); break; 2674 case T_ADDRESS: cmp = new CmpPNode(in1, in2); break; 2675 default: fatal("unexpected comparison type %s", type2name(bt)); 2676 } 2677 gvn->transform(cmp); 2678 Node* bol = gvn->transform(new BoolNode(cmp, test)); 2679 IfNode* iff = new IfNode(ctrl, bol, p, COUNT_UNKNOWN); 2680 gvn->transform(iff); 2681 if (!bol->is_Con()) gvn->record_for_igvn(iff); 2682 return iff; 2683 } 2684 2685 2686 //-------------------------------gen_subtype_check----------------------------- 2687 // Generate a subtyping check. Takes as input the subtype and supertype. 2688 // Returns 2 values: sets the default control() to the true path and returns 2689 // the false path. Only reads invariant memory; sets no (visible) memory. 2690 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding 2691 // but that's not exposed to the optimizer. This call also doesn't take in an 2692 // Object; if you wish to check an Object you need to load the Object's class 2693 // prior to coming here. 2694 Node* Phase::gen_subtype_check(Node* subklass, Node* superklass, Node** ctrl, MergeMemNode* mem, PhaseGVN* gvn) { 2695 Compile* C = gvn->C; 2696 2697 if ((*ctrl)->is_top()) { 2698 return C->top(); 2699 } 2700 2701 // Fast check for identical types, perhaps identical constants. 2702 // The types can even be identical non-constants, in cases 2703 // involving Array.newInstance, Object.clone, etc. 2704 if (subklass == superklass) 2705 return C->top(); // false path is dead; no test needed. 2706 2707 if (gvn->type(superklass)->singleton()) { 2708 ciKlass* superk = gvn->type(superklass)->is_klassptr()->klass(); 2709 ciKlass* subk = gvn->type(subklass)->is_klassptr()->klass(); 2710 2711 // In the common case of an exact superklass, try to fold up the 2712 // test before generating code. You may ask, why not just generate 2713 // the code and then let it fold up? The answer is that the generated 2714 // code will necessarily include null checks, which do not always 2715 // completely fold away. If they are also needless, then they turn 2716 // into a performance loss. Example: 2717 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x; 2718 // Here, the type of 'fa' is often exact, so the store check 2719 // of fa[1]=x will fold up, without testing the nullness of x. 2720 switch (C->static_subtype_check(superk, subk)) { 2721 case Compile::SSC_always_false: 2722 { 2723 Node* always_fail = *ctrl; 2724 *ctrl = gvn->C->top(); 2725 return always_fail; 2726 } 2727 case Compile::SSC_always_true: 2728 return C->top(); 2729 case Compile::SSC_easy_test: 2730 { 2731 // Just do a direct pointer compare and be done. 2732 IfNode* iff = gen_subtype_check_compare(*ctrl, subklass, superklass, BoolTest::eq, PROB_STATIC_FREQUENT, gvn, T_ADDRESS); 2733 *ctrl = gvn->transform(new IfTrueNode(iff)); 2734 return gvn->transform(new IfFalseNode(iff)); 2735 } 2736 case Compile::SSC_full_test: 2737 break; 2738 default: 2739 ShouldNotReachHere(); 2740 } 2741 } 2742 2743 // %%% Possible further optimization: Even if the superklass is not exact, 2744 // if the subklass is the unique subtype of the superklass, the check 2745 // will always succeed. We could leave a dependency behind to ensure this. 2746 2747 // First load the super-klass's check-offset 2748 Node *p1 = gvn->transform(new AddPNode(superklass, superklass, gvn->MakeConX(in_bytes(Klass::super_check_offset_offset())))); 2749 Node* m = mem->memory_at(C->get_alias_index(gvn->type(p1)->is_ptr())); 2750 Node *chk_off = gvn->transform(new LoadINode(NULL, m, p1, gvn->type(p1)->is_ptr(), TypeInt::INT, MemNode::unordered)); 2751 int cacheoff_con = in_bytes(Klass::secondary_super_cache_offset()); 2752 bool might_be_cache = (gvn->find_int_con(chk_off, cacheoff_con) == cacheoff_con); 2753 2754 // Load from the sub-klass's super-class display list, or a 1-word cache of 2755 // the secondary superclass list, or a failing value with a sentinel offset 2756 // if the super-klass is an interface or exceptionally deep in the Java 2757 // hierarchy and we have to scan the secondary superclass list the hard way. 2758 // Worst-case type is a little odd: NULL is allowed as a result (usually 2759 // klass loads can never produce a NULL). 2760 Node *chk_off_X = chk_off; 2761 #ifdef _LP64 2762 chk_off_X = gvn->transform(new ConvI2LNode(chk_off_X)); 2763 #endif 2764 Node *p2 = gvn->transform(new AddPNode(subklass,subklass,chk_off_X)); 2765 // For some types like interfaces the following loadKlass is from a 1-word 2766 // cache which is mutable so can't use immutable memory. Other 2767 // types load from the super-class display table which is immutable. 2768 m = mem->memory_at(C->get_alias_index(gvn->type(p2)->is_ptr())); 2769 Node *kmem = might_be_cache ? m : C->immutable_memory(); 2770 Node *nkls = gvn->transform(LoadKlassNode::make(*gvn, NULL, kmem, p2, gvn->type(p2)->is_ptr(), TypeKlassPtr::BOTTOM)); 2771 2772 // Compile speed common case: ARE a subtype and we canNOT fail 2773 if( superklass == nkls ) 2774 return C->top(); // false path is dead; no test needed. 2775 2776 // See if we get an immediate positive hit. Happens roughly 83% of the 2777 // time. Test to see if the value loaded just previously from the subklass 2778 // is exactly the superklass. 2779 IfNode *iff1 = gen_subtype_check_compare(*ctrl, superklass, nkls, BoolTest::eq, PROB_LIKELY(0.83f), gvn, T_ADDRESS); 2780 Node *iftrue1 = gvn->transform( new IfTrueNode (iff1)); 2781 *ctrl = gvn->transform(new IfFalseNode(iff1)); 2782 2783 // Compile speed common case: Check for being deterministic right now. If 2784 // chk_off is a constant and not equal to cacheoff then we are NOT a 2785 // subklass. In this case we need exactly the 1 test above and we can 2786 // return those results immediately. 2787 if (!might_be_cache) { 2788 Node* not_subtype_ctrl = *ctrl; 2789 *ctrl = iftrue1; // We need exactly the 1 test above 2790 return not_subtype_ctrl; 2791 } 2792 2793 // Gather the various success & failures here 2794 RegionNode *r_ok_subtype = new RegionNode(4); 2795 gvn->record_for_igvn(r_ok_subtype); 2796 RegionNode *r_not_subtype = new RegionNode(3); 2797 gvn->record_for_igvn(r_not_subtype); 2798 2799 r_ok_subtype->init_req(1, iftrue1); 2800 2801 // Check for immediate negative hit. Happens roughly 11% of the time (which 2802 // is roughly 63% of the remaining cases). Test to see if the loaded 2803 // check-offset points into the subklass display list or the 1-element 2804 // cache. If it points to the display (and NOT the cache) and the display 2805 // missed then it's not a subtype. 2806 Node *cacheoff = gvn->intcon(cacheoff_con); 2807 IfNode *iff2 = gen_subtype_check_compare(*ctrl, chk_off, cacheoff, BoolTest::ne, PROB_LIKELY(0.63f), gvn, T_INT); 2808 r_not_subtype->init_req(1, gvn->transform(new IfTrueNode (iff2))); 2809 *ctrl = gvn->transform(new IfFalseNode(iff2)); 2810 2811 // Check for self. Very rare to get here, but it is taken 1/3 the time. 2812 // No performance impact (too rare) but allows sharing of secondary arrays 2813 // which has some footprint reduction. 2814 IfNode *iff3 = gen_subtype_check_compare(*ctrl, subklass, superklass, BoolTest::eq, PROB_LIKELY(0.36f), gvn, T_ADDRESS); 2815 r_ok_subtype->init_req(2, gvn->transform(new IfTrueNode(iff3))); 2816 *ctrl = gvn->transform(new IfFalseNode(iff3)); 2817 2818 // -- Roads not taken here: -- 2819 // We could also have chosen to perform the self-check at the beginning 2820 // of this code sequence, as the assembler does. This would not pay off 2821 // the same way, since the optimizer, unlike the assembler, can perform 2822 // static type analysis to fold away many successful self-checks. 2823 // Non-foldable self checks work better here in second position, because 2824 // the initial primary superclass check subsumes a self-check for most 2825 // types. An exception would be a secondary type like array-of-interface, 2826 // which does not appear in its own primary supertype display. 2827 // Finally, we could have chosen to move the self-check into the 2828 // PartialSubtypeCheckNode, and from there out-of-line in a platform 2829 // dependent manner. But it is worthwhile to have the check here, 2830 // where it can be perhaps be optimized. The cost in code space is 2831 // small (register compare, branch). 2832 2833 // Now do a linear scan of the secondary super-klass array. Again, no real 2834 // performance impact (too rare) but it's gotta be done. 2835 // Since the code is rarely used, there is no penalty for moving it 2836 // out of line, and it can only improve I-cache density. 2837 // The decision to inline or out-of-line this final check is platform 2838 // dependent, and is found in the AD file definition of PartialSubtypeCheck. 2839 Node* psc = gvn->transform( 2840 new PartialSubtypeCheckNode(*ctrl, subklass, superklass)); 2841 2842 IfNode *iff4 = gen_subtype_check_compare(*ctrl, psc, gvn->zerocon(T_OBJECT), BoolTest::ne, PROB_FAIR, gvn, T_ADDRESS); 2843 r_not_subtype->init_req(2, gvn->transform(new IfTrueNode (iff4))); 2844 r_ok_subtype ->init_req(3, gvn->transform(new IfFalseNode(iff4))); 2845 2846 // Return false path; set default control to true path. 2847 *ctrl = gvn->transform(r_ok_subtype); 2848 return gvn->transform(r_not_subtype); 2849 } 2850 2851 // Profile-driven exact type check: 2852 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass, 2853 float prob, 2854 Node* *casted_receiver) { 2855 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass); 2856 Node* recv_klass = load_object_klass(receiver); 2857 Node* fail = type_check(recv_klass, tklass, prob); 2858 const TypeOopPtr* recv_xtype = tklass->as_instance_type(); 2859 assert(recv_xtype->klass_is_exact(), ""); 2860 2861 // Subsume downstream occurrences of receiver with a cast to 2862 // recv_xtype, since now we know what the type will be. 2863 Node* cast = new CheckCastPPNode(control(), receiver, recv_xtype); 2864 Node* res = _gvn.transform(cast); 2865 if (recv_xtype->is_valuetypeptr()) { 2866 assert(!gvn().type(res)->is_ptr()->maybe_null(), "should never be null"); 2867 res = ValueTypeNode::make_from_oop(this, res, recv_xtype->value_klass()); 2868 } 2869 2870 (*casted_receiver) = res; 2871 // (User must make the replace_in_map call.) 2872 2873 return fail; 2874 } 2875 2876 Node* GraphKit::type_check(Node* recv_klass, const TypeKlassPtr* tklass, 2877 float prob) { 2878 Node* want_klass = makecon(tklass); 2879 Node* cmp = _gvn.transform( new CmpPNode(recv_klass, want_klass)); 2880 Node* bol = _gvn.transform( new BoolNode(cmp, BoolTest::eq) ); 2881 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN); 2882 set_control( _gvn.transform( new IfTrueNode (iff))); 2883 Node* fail = _gvn.transform( new IfFalseNode(iff)); 2884 return fail; 2885 } 2886 2887 2888 //------------------------------seems_never_null------------------------------- 2889 // Use null_seen information if it is available from the profile. 2890 // If we see an unexpected null at a type check we record it and force a 2891 // recompile; the offending check will be recompiled to handle NULLs. 2892 // If we see several offending BCIs, then all checks in the 2893 // method will be recompiled. 2894 bool GraphKit::seems_never_null(Node* obj, ciProfileData* data, bool& speculating) { 2895 speculating = !_gvn.type(obj)->speculative_maybe_null(); 2896 Deoptimization::DeoptReason reason = Deoptimization::reason_null_check(speculating); 2897 if (UncommonNullCast // Cutout for this technique 2898 && obj != null() // And not the -Xcomp stupid case? 2899 && !too_many_traps(reason) 2900 ) { 2901 if (speculating) { 2902 return true; 2903 } 2904 if (data == NULL) 2905 // Edge case: no mature data. Be optimistic here. 2906 return true; 2907 // If the profile has not seen a null, assume it won't happen. 2908 assert(java_bc() == Bytecodes::_checkcast || 2909 java_bc() == Bytecodes::_instanceof || 2910 java_bc() == Bytecodes::_aastore, "MDO must collect null_seen bit here"); 2911 return !data->as_BitData()->null_seen(); 2912 } 2913 speculating = false; 2914 return false; 2915 } 2916 2917 //------------------------maybe_cast_profiled_receiver------------------------- 2918 // If the profile has seen exactly one type, narrow to exactly that type. 2919 // Subsequent type checks will always fold up. 2920 Node* GraphKit::maybe_cast_profiled_receiver(Node* not_null_obj, 2921 ciKlass* require_klass, 2922 ciKlass* spec_klass, 2923 bool safe_for_replace) { 2924 if (!UseTypeProfile || !TypeProfileCasts) return NULL; 2925 2926 Deoptimization::DeoptReason reason = Deoptimization::reason_class_check(spec_klass != NULL); 2927 2928 // Make sure we haven't already deoptimized from this tactic. 2929 if (too_many_traps(reason) || too_many_recompiles(reason)) 2930 return NULL; 2931 2932 // (No, this isn't a call, but it's enough like a virtual call 2933 // to use the same ciMethod accessor to get the profile info...) 2934 // If we have a speculative type use it instead of profiling (which 2935 // may not help us) 2936 ciKlass* exact_kls = spec_klass == NULL ? profile_has_unique_klass() : spec_klass; 2937 if (exact_kls != NULL) {// no cast failures here 2938 if (require_klass == NULL || 2939 C->static_subtype_check(require_klass, exact_kls) == Compile::SSC_always_true) { 2940 // If we narrow the type to match what the type profile sees or 2941 // the speculative type, we can then remove the rest of the 2942 // cast. 2943 // This is a win, even if the exact_kls is very specific, 2944 // because downstream operations, such as method calls, 2945 // will often benefit from the sharper type. 2946 Node* exact_obj = not_null_obj; // will get updated in place... 2947 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, 2948 &exact_obj); 2949 { PreserveJVMState pjvms(this); 2950 set_control(slow_ctl); 2951 uncommon_trap_exact(reason, Deoptimization::Action_maybe_recompile); 2952 } 2953 if (safe_for_replace) { 2954 replace_in_map(not_null_obj, exact_obj); 2955 } 2956 return exact_obj; 2957 } 2958 // assert(ssc == Compile::SSC_always_true)... except maybe the profile lied to us. 2959 } 2960 2961 return NULL; 2962 } 2963 2964 /** 2965 * Cast obj to type and emit guard unless we had too many traps here 2966 * already 2967 * 2968 * @param obj node being casted 2969 * @param type type to cast the node to 2970 * @param not_null true if we know node cannot be null 2971 */ 2972 Node* GraphKit::maybe_cast_profiled_obj(Node* obj, 2973 ciKlass* type, 2974 bool not_null) { 2975 if (stopped()) { 2976 return obj; 2977 } 2978 2979 // type == NULL if profiling tells us this object is always null 2980 if (type != NULL) { 2981 Deoptimization::DeoptReason class_reason = Deoptimization::Reason_speculate_class_check; 2982 Deoptimization::DeoptReason null_reason = Deoptimization::Reason_speculate_null_check; 2983 2984 if (!too_many_traps(null_reason) && !too_many_recompiles(null_reason) && 2985 !too_many_traps(class_reason) && 2986 !too_many_recompiles(class_reason)) { 2987 Node* not_null_obj = NULL; 2988 // not_null is true if we know the object is not null and 2989 // there's no need for a null check 2990 if (!not_null) { 2991 Node* null_ctl = top(); 2992 not_null_obj = null_check_oop(obj, &null_ctl, true, true, true); 2993 assert(null_ctl->is_top(), "no null control here"); 2994 } else { 2995 not_null_obj = obj; 2996 } 2997 2998 Node* exact_obj = not_null_obj; 2999 ciKlass* exact_kls = type; 3000 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, 3001 &exact_obj); 3002 { 3003 PreserveJVMState pjvms(this); 3004 set_control(slow_ctl); 3005 uncommon_trap_exact(class_reason, Deoptimization::Action_maybe_recompile); 3006 } 3007 replace_in_map(not_null_obj, exact_obj); 3008 obj = exact_obj; 3009 } 3010 } else { 3011 if (!too_many_traps(Deoptimization::Reason_null_assert) && 3012 !too_many_recompiles(Deoptimization::Reason_null_assert)) { 3013 Node* exact_obj = null_assert(obj); 3014 replace_in_map(obj, exact_obj); 3015 obj = exact_obj; 3016 } 3017 } 3018 return obj; 3019 } 3020 3021 //-------------------------------gen_instanceof-------------------------------- 3022 // Generate an instance-of idiom. Used by both the instance-of bytecode 3023 // and the reflective instance-of call. 3024 Node* GraphKit::gen_instanceof(Node* obj, Node* superklass, bool safe_for_replace) { 3025 kill_dead_locals(); // Benefit all the uncommon traps 3026 assert( !stopped(), "dead parse path should be checked in callers" ); 3027 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()), 3028 "must check for not-null not-dead klass in callers"); 3029 3030 // Make the merge point 3031 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT }; 3032 RegionNode* region = new RegionNode(PATH_LIMIT); 3033 Node* phi = new PhiNode(region, TypeInt::BOOL); 3034 C->set_has_split_ifs(true); // Has chance for split-if optimization 3035 3036 ciProfileData* data = NULL; 3037 if (java_bc() == Bytecodes::_instanceof) { // Only for the bytecode 3038 data = method()->method_data()->bci_to_data(bci()); 3039 } 3040 bool speculative_not_null = false; 3041 bool never_see_null = (ProfileDynamicTypes // aggressive use of profile 3042 && seems_never_null(obj, data, speculative_not_null)); 3043 bool is_value = obj->is_ValueType(); 3044 3045 // Null check; get casted pointer; set region slot 3 3046 Node* null_ctl = top(); 3047 Node* not_null_obj = is_value ? obj : null_check_oop(obj, &null_ctl, never_see_null, safe_for_replace, speculative_not_null); 3048 3049 // If not_null_obj is dead, only null-path is taken 3050 if (stopped()) { // Doing instance-of on a NULL? 3051 set_control(null_ctl); 3052 return intcon(0); 3053 } 3054 region->init_req(_null_path, null_ctl); 3055 phi ->init_req(_null_path, intcon(0)); // Set null path value 3056 if (null_ctl == top()) { 3057 // Do this eagerly, so that pattern matches like is_diamond_phi 3058 // will work even during parsing. 3059 assert(_null_path == PATH_LIMIT-1, "delete last"); 3060 region->del_req(_null_path); 3061 phi ->del_req(_null_path); 3062 } 3063 3064 // Do we know the type check always succeed? 3065 if (!is_value) { 3066 bool known_statically = false; 3067 if (_gvn.type(superklass)->singleton()) { 3068 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass(); 3069 ciKlass* subk = _gvn.type(obj)->is_oopptr()->klass(); 3070 if (subk != NULL && subk->is_loaded()) { 3071 int static_res = C->static_subtype_check(superk, subk); 3072 known_statically = (static_res == Compile::SSC_always_true || static_res == Compile::SSC_always_false); 3073 } 3074 } 3075 3076 if (!known_statically) { 3077 const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr(); 3078 // We may not have profiling here or it may not help us. If we 3079 // have a speculative type use it to perform an exact cast. 3080 ciKlass* spec_obj_type = obj_type->speculative_type(); 3081 if (spec_obj_type != NULL || (ProfileDynamicTypes && data != NULL)) { 3082 Node* cast_obj = maybe_cast_profiled_receiver(not_null_obj, NULL, spec_obj_type, safe_for_replace); 3083 if (stopped()) { // Profile disagrees with this path. 3084 set_control(null_ctl); // Null is the only remaining possibility. 3085 return intcon(0); 3086 } 3087 if (cast_obj != NULL && 3088 // A value that's sometimes null is not something we can optimize well 3089 !(cast_obj->is_ValueType() && null_ctl != top())) { 3090 not_null_obj = cast_obj; 3091 is_value = not_null_obj->is_ValueType(); 3092 } 3093 } 3094 } 3095 } 3096 3097 // Load the object's klass 3098 Node* obj_klass = NULL; 3099 if (is_value) { 3100 obj_klass = makecon(TypeKlassPtr::make(_gvn.type(not_null_obj)->is_valuetype()->value_klass())); 3101 } else { 3102 obj_klass = load_object_klass(not_null_obj); 3103 } 3104 3105 // Generate the subtype check 3106 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass); 3107 3108 // Plug in the success path to the general merge in slot 1. 3109 region->init_req(_obj_path, control()); 3110 phi ->init_req(_obj_path, intcon(1)); 3111 3112 // Plug in the failing path to the general merge in slot 2. 3113 region->init_req(_fail_path, not_subtype_ctrl); 3114 phi ->init_req(_fail_path, intcon(0)); 3115 3116 // Return final merged results 3117 set_control( _gvn.transform(region) ); 3118 record_for_igvn(region); 3119 3120 // If we know the type check always succeeds then we don't use the 3121 // profiling data at this bytecode. Don't lose it, feed it to the 3122 // type system as a speculative type. 3123 if (safe_for_replace && !is_value) { 3124 Node* casted_obj = record_profiled_receiver_for_speculation(obj); 3125 replace_in_map(obj, casted_obj); 3126 } 3127 3128 return _gvn.transform(phi); 3129 } 3130 3131 //-------------------------------gen_checkcast--------------------------------- 3132 // Generate a checkcast idiom. Used by both the checkcast bytecode and the 3133 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the 3134 // uncommon-trap paths work. Adjust stack after this call. 3135 // If failure_control is supplied and not null, it is filled in with 3136 // the control edge for the cast failure. Otherwise, an appropriate 3137 // uncommon trap or exception is thrown. 3138 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, 3139 Node* *failure_control) { 3140 kill_dead_locals(); // Benefit all the uncommon traps 3141 const TypeKlassPtr* tk = _gvn.type(superklass)->is_klassptr(); 3142 const TypeOopPtr* toop = TypeOopPtr::make_from_klass(tk->klass()); 3143 3144 bool is_value = obj->is_ValueType(); 3145 3146 // Fast cutout: Check the case that the cast is vacuously true. 3147 // This detects the common cases where the test will short-circuit 3148 // away completely. We do this before we perform the null check, 3149 // because if the test is going to turn into zero code, we don't 3150 // want a residual null check left around. (Causes a slowdown, 3151 // for example, in some objArray manipulations, such as a[i]=a[j].) 3152 if (tk->singleton()) { 3153 ciKlass* klass = NULL; 3154 if (is_value) { 3155 klass = _gvn.type(obj)->is_valuetype()->value_klass(); 3156 } else { 3157 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr(); 3158 if (objtp != NULL) { 3159 klass = objtp->klass(); 3160 } 3161 } 3162 if (klass != NULL) { 3163 switch (C->static_subtype_check(tk->klass(), klass)) { 3164 case Compile::SSC_always_true: 3165 // If we know the type check always succeed then we don't use 3166 // the profiling data at this bytecode. Don't lose it, feed it 3167 // to the type system as a speculative type. 3168 if (!is_value) { 3169 obj = record_profiled_receiver_for_speculation(obj); 3170 if (toop->is_valuetypeptr()) { 3171 obj = ValueTypeNode::make_from_oop(this, obj, toop->value_klass(), /* buffer_check */ false, /* null2default */ false); 3172 } 3173 } 3174 return obj; 3175 case Compile::SSC_always_false: 3176 // It needs a null check because a null will *pass* the cast check. 3177 // A non-null value will always produce an exception. 3178 if (is_value) { 3179 builtin_throw(Deoptimization::Reason_class_check, makecon(TypeKlassPtr::make(klass))); 3180 return top(); 3181 } else { 3182 return null_assert(obj); 3183 } 3184 } 3185 } 3186 } 3187 3188 ciProfileData* data = NULL; 3189 bool safe_for_replace = false; 3190 if (failure_control == NULL) { // use MDO in regular case only 3191 assert(java_bc() == Bytecodes::_aastore || 3192 java_bc() == Bytecodes::_checkcast, 3193 "interpreter profiles type checks only for these BCs"); 3194 data = method()->method_data()->bci_to_data(bci()); 3195 safe_for_replace = true; 3196 } 3197 3198 // Make the merge point 3199 enum { _obj_path = 1, _null_path, PATH_LIMIT }; 3200 RegionNode* region = new RegionNode(PATH_LIMIT); 3201 Node* phi = new PhiNode(region, toop); 3202 C->set_has_split_ifs(true); // Has chance for split-if optimization 3203 3204 // Use null-cast information if it is available 3205 bool speculative_not_null = false; 3206 bool never_see_null = ((failure_control == NULL) // regular case only 3207 && seems_never_null(obj, data, speculative_not_null)); 3208 3209 // Null check; get casted pointer; set region slot 3 3210 Node* null_ctl = top(); 3211 Node* not_null_obj = is_value ? obj : null_check_oop(obj, &null_ctl, never_see_null, safe_for_replace, speculative_not_null); 3212 3213 // If not_null_obj is dead, only null-path is taken 3214 if (stopped()) { // Doing instance-of on a NULL? 3215 set_control(null_ctl); 3216 return null(); 3217 } 3218 region->init_req(_null_path, null_ctl); 3219 phi ->init_req(_null_path, null()); // Set null path value 3220 if (null_ctl == top()) { 3221 // Do this eagerly, so that pattern matches like is_diamond_phi 3222 // will work even during parsing. 3223 assert(_null_path == PATH_LIMIT-1, "delete last"); 3224 region->del_req(_null_path); 3225 phi ->del_req(_null_path); 3226 } 3227 3228 Node* cast_obj = NULL; 3229 if (!is_value && tk->klass_is_exact()) { 3230 // The following optimization tries to statically cast the speculative type of the object 3231 // (for example obtained during profiling) to the type of the superklass and then do a 3232 // dynamic check that the type of the object is what we expect. To work correctly 3233 // for checkcast and aastore the type of superklass should be exact. 3234 const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr(); 3235 // We may not have profiling here or it may not help us. If we have 3236 // a speculative type use it to perform an exact cast. 3237 ciKlass* spec_obj_type = obj_type->speculative_type(); 3238 if (spec_obj_type != NULL || data != NULL) { 3239 cast_obj = maybe_cast_profiled_receiver(not_null_obj, tk->klass(), spec_obj_type, safe_for_replace); 3240 if (cast_obj != NULL && cast_obj->is_ValueType()) { 3241 if (null_ctl != top()) { 3242 cast_obj = NULL; // A value that's sometimes null is not something we can optimize well 3243 } else { 3244 return cast_obj; 3245 } 3246 } 3247 if (cast_obj != NULL) { 3248 if (failure_control != NULL) // failure is now impossible 3249 (*failure_control) = top(); 3250 // adjust the type of the phi to the exact klass: 3251 phi->raise_bottom_type(_gvn.type(cast_obj)->meet_speculative(TypePtr::NULL_PTR)); 3252 } 3253 } 3254 } 3255 3256 if (cast_obj == NULL) { 3257 // Load the object's klass 3258 Node* obj_klass = NULL; 3259 if (is_value) { 3260 obj_klass = makecon(TypeKlassPtr::make(_gvn.type(not_null_obj)->is_valuetype()->value_klass())); 3261 } else { 3262 obj_klass = load_object_klass(not_null_obj); 3263 } 3264 3265 // Generate the subtype check 3266 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass ); 3267 3268 if (is_value) { 3269 not_null_obj = ValueTypePtrNode::make_from_value_type(this, not_null_obj->as_ValueType(), true); 3270 } 3271 3272 // Plug in success path into the merge 3273 cast_obj = _gvn.transform(new CheckCastPPNode(control(), not_null_obj, toop)); 3274 // Failure path ends in uncommon trap (or may be dead - failure impossible) 3275 if (failure_control == NULL) { 3276 if (not_subtype_ctrl != top()) { // If failure is possible 3277 PreserveJVMState pjvms(this); 3278 set_control(not_subtype_ctrl); 3279 builtin_throw(Deoptimization::Reason_class_check, obj_klass); 3280 } 3281 } else { 3282 (*failure_control) = not_subtype_ctrl; 3283 } 3284 } 3285 3286 region->init_req(_obj_path, control()); 3287 phi ->init_req(_obj_path, cast_obj); 3288 3289 // A merge of NULL or Casted-NotNull obj 3290 Node* res = _gvn.transform(phi); 3291 3292 // Note I do NOT always 'replace_in_map(obj,result)' here. 3293 // if( tk->klass()->can_be_primary_super() ) 3294 // This means that if I successfully store an Object into an array-of-String 3295 // I 'forget' that the Object is really now known to be a String. I have to 3296 // do this because we don't have true union types for interfaces - if I store 3297 // a Baz into an array-of-Interface and then tell the optimizer it's an 3298 // Interface, I forget that it's also a Baz and cannot do Baz-like field 3299 // references to it. FIX THIS WHEN UNION TYPES APPEAR! 3300 // replace_in_map( obj, res ); 3301 3302 // Return final merged results 3303 set_control( _gvn.transform(region) ); 3304 record_for_igvn(region); 3305 3306 if (!is_value) { 3307 res = record_profiled_receiver_for_speculation(res); 3308 if (toop->is_valuetypeptr()) { 3309 res = ValueTypeNode::make_from_oop(this, res, toop->value_klass(), /* buffer_check */ false, /* null2default */ false); 3310 } 3311 } 3312 return res; 3313 } 3314 3315 Node* GraphKit::is_always_locked(Node* obj) { 3316 Node* mark_addr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes()); 3317 Node* mark = make_load(NULL, mark_addr, TypeX_X, TypeX_X->basic_type(), MemNode::unordered); 3318 Node* value_mask = _gvn.MakeConX(markOopDesc::always_locked_pattern); 3319 return _gvn.transform(new AndXNode(mark, value_mask)); 3320 } 3321 3322 Node* GraphKit::gen_value_type_test(Node* kls) { 3323 Node* flags_addr = basic_plus_adr(kls, in_bytes(Klass::access_flags_offset())); 3324 Node* flags = make_load(NULL, flags_addr, TypeInt::INT, T_INT, MemNode::unordered); 3325 Node* is_value = _gvn.transform(new AndINode(flags, intcon(JVM_ACC_VALUE))); 3326 Node* cmp = _gvn.transform(new CmpINode(is_value, intcon(0))); 3327 return cmp; 3328 } 3329 3330 // Deoptimize if 'obj' is a value type 3331 void GraphKit::gen_value_type_guard(Node* obj, int nargs) { 3332 assert(EnableValhalla, "should only be used if value types are enabled"); 3333 Node* bol = NULL; 3334 if (obj->is_ValueTypeBase()) { 3335 bol = intcon(0); 3336 } else { 3337 Node* is_value = is_always_locked(obj); 3338 Node* value_mask = _gvn.MakeConX(markOopDesc::always_locked_pattern); 3339 Node* cmp = _gvn.transform(new CmpXNode(is_value, value_mask)); 3340 bol = _gvn.transform(new BoolNode(cmp, BoolTest::ne)); 3341 } 3342 { BuildCutout unless(this, bol, PROB_MAX); 3343 inc_sp(nargs); 3344 uncommon_trap(Deoptimization::Reason_class_check, 3345 Deoptimization::Action_none); 3346 } 3347 } 3348 3349 // Deoptimize if 'ary' is flattened or if 'obj' is null and 'ary' is a value type array 3350 void GraphKit::gen_value_type_array_guard(Node* ary, Node* obj, Node* elem_klass, int nargs) { 3351 assert(EnableValhalla, "should only be used if value types are enabled"); 3352 if (elem_klass == NULL) { 3353 // Load array element klass 3354 Node* kls = load_object_klass(ary); 3355 Node* k_adr = basic_plus_adr(kls, in_bytes(ArrayKlass::element_klass_offset())); 3356 elem_klass = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), k_adr, TypeInstPtr::KLASS)); 3357 } 3358 // Check if element is a value type 3359 Node* flags_addr = basic_plus_adr(elem_klass, in_bytes(Klass::access_flags_offset())); 3360 Node* flags = make_load(NULL, flags_addr, TypeInt::INT, T_INT, MemNode::unordered); 3361 Node* is_value_elem = _gvn.transform(new AndINode(flags, intcon(JVM_ACC_VALUE))); 3362 3363 const Type* objtype = _gvn.type(obj); 3364 if (objtype == TypePtr::NULL_PTR) { 3365 // Object is always null, check if array is a value type array 3366 Node* cmp = _gvn.transform(new CmpINode(is_value_elem, intcon(0))); 3367 Node* bol = _gvn.transform(new BoolNode(cmp, BoolTest::eq)); 3368 { BuildCutout unless(this, bol, PROB_MAX); 3369 // TODO just deoptimize for now if we store null to a value type array 3370 inc_sp(nargs); 3371 uncommon_trap(Deoptimization::Reason_array_check, 3372 Deoptimization::Action_none); 3373 } 3374 } else { 3375 // Check if (is_value_elem && obj_is_null) <=> (!is_value_elem | !obj_is_null == 0) 3376 // TODO what if we later figure out that obj is never null? 3377 Node* not_value = _gvn.transform(new XorINode(is_value_elem, intcon(JVM_ACC_VALUE))); 3378 not_value = _gvn.transform(new ConvI2LNode(not_value)); 3379 Node* not_null = _gvn.transform(new CastP2XNode(NULL, obj)); 3380 Node* both = _gvn.transform(new OrLNode(not_null, not_value)); 3381 Node* cmp = _gvn.transform(new CmpLNode(both, longcon(0))); 3382 Node* bol = _gvn.transform(new BoolNode(cmp, BoolTest::ne)); 3383 { BuildCutout unless(this, bol, PROB_MAX); 3384 // TODO just deoptimize for now if we store null to a value type array 3385 inc_sp(nargs); 3386 uncommon_trap(Deoptimization::Reason_array_check, 3387 Deoptimization::Action_none); 3388 } 3389 } 3390 } 3391 3392 Node* GraphKit::gen_lh_array_test(Node* kls, unsigned int lh_value) { 3393 Node* lhp = basic_plus_adr(kls, in_bytes(Klass::layout_helper_offset())); 3394 Node* layout_val = make_load(NULL, lhp, TypeInt::INT, T_INT, MemNode::unordered); 3395 layout_val = _gvn.transform(new RShiftINode(layout_val, intcon(Klass::_lh_array_tag_shift))); 3396 Node* cmp = _gvn.transform(new CmpINode(layout_val, intcon(lh_value))); 3397 return cmp; 3398 } 3399 3400 3401 // Deoptimize if 'ary' is a flattened value type array 3402 void GraphKit::gen_flattened_array_guard(Node* ary, int nargs) { 3403 assert(EnableValhalla, "should only be used if value types are enabled"); 3404 if (ValueArrayFlatten) { 3405 // Cannot statically determine if array is flattened, emit runtime check 3406 Node* kls = load_object_klass(ary); 3407 Node* cmp = gen_lh_array_test(kls, Klass::_lh_array_tag_vt_value); 3408 Node* bol = _gvn.transform(new BoolNode(cmp, BoolTest::ne)); 3409 3410 { BuildCutout unless(this, bol, PROB_MAX); 3411 // TODO just deoptimize for now if value type array is flattened 3412 inc_sp(nargs); 3413 uncommon_trap(Deoptimization::Reason_array_check, 3414 Deoptimization::Action_none); 3415 } 3416 } 3417 } 3418 3419 //------------------------------next_monitor----------------------------------- 3420 // What number should be given to the next monitor? 3421 int GraphKit::next_monitor() { 3422 int current = jvms()->monitor_depth()* C->sync_stack_slots(); 3423 int next = current + C->sync_stack_slots(); 3424 // Keep the toplevel high water mark current: 3425 if (C->fixed_slots() < next) C->set_fixed_slots(next); 3426 return current; 3427 } 3428 3429 //------------------------------insert_mem_bar--------------------------------- 3430 // Memory barrier to avoid floating things around 3431 // The membar serves as a pinch point between both control and all memory slices. 3432 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) { 3433 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent); 3434 mb->init_req(TypeFunc::Control, control()); 3435 mb->init_req(TypeFunc::Memory, reset_memory()); 3436 Node* membar = _gvn.transform(mb); 3437 set_control(_gvn.transform(new ProjNode(membar, TypeFunc::Control))); 3438 set_all_memory_call(membar); 3439 return membar; 3440 } 3441 3442 //-------------------------insert_mem_bar_volatile---------------------------- 3443 // Memory barrier to avoid floating things around 3444 // The membar serves as a pinch point between both control and memory(alias_idx). 3445 // If you want to make a pinch point on all memory slices, do not use this 3446 // function (even with AliasIdxBot); use insert_mem_bar() instead. 3447 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) { 3448 // When Parse::do_put_xxx updates a volatile field, it appends a series 3449 // of MemBarVolatile nodes, one for *each* volatile field alias category. 3450 // The first membar is on the same memory slice as the field store opcode. 3451 // This forces the membar to follow the store. (Bug 6500685 broke this.) 3452 // All the other membars (for other volatile slices, including AliasIdxBot, 3453 // which stands for all unknown volatile slices) are control-dependent 3454 // on the first membar. This prevents later volatile loads or stores 3455 // from sliding up past the just-emitted store. 3456 3457 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent); 3458 mb->set_req(TypeFunc::Control,control()); 3459 if (alias_idx == Compile::AliasIdxBot) { 3460 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory()); 3461 } else { 3462 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller"); 3463 mb->set_req(TypeFunc::Memory, memory(alias_idx)); 3464 } 3465 Node* membar = _gvn.transform(mb); 3466 set_control(_gvn.transform(new ProjNode(membar, TypeFunc::Control))); 3467 if (alias_idx == Compile::AliasIdxBot) { 3468 merged_memory()->set_base_memory(_gvn.transform(new ProjNode(membar, TypeFunc::Memory))); 3469 } else { 3470 set_memory(_gvn.transform(new ProjNode(membar, TypeFunc::Memory)),alias_idx); 3471 } 3472 return membar; 3473 } 3474 3475 //------------------------------shared_lock------------------------------------ 3476 // Emit locking code. 3477 FastLockNode* GraphKit::shared_lock(Node* obj) { 3478 // bci is either a monitorenter bc or InvocationEntryBci 3479 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces 3480 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); 3481 3482 if( !GenerateSynchronizationCode ) 3483 return NULL; // Not locking things? 3484 3485 // We cannot lock on a value type 3486 const TypeOopPtr* objptr = _gvn.type(obj)->make_oopptr(); 3487 if (objptr->can_be_value_type()) { 3488 gen_value_type_guard(obj, 1); 3489 } 3490 3491 if (stopped()) // Dead monitor? 3492 return NULL; 3493 3494 assert(dead_locals_are_killed(), "should kill locals before sync. point"); 3495 3496 // Box the stack location 3497 Node* box = _gvn.transform(new BoxLockNode(next_monitor())); 3498 Node* mem = reset_memory(); 3499 3500 FastLockNode * flock = _gvn.transform(new FastLockNode(0, obj, box) )->as_FastLock(); 3501 if (UseBiasedLocking && PrintPreciseBiasedLockingStatistics) { 3502 // Create the counters for this fast lock. 3503 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci 3504 } 3505 3506 // Create the rtm counters for this fast lock if needed. 3507 flock->create_rtm_lock_counter(sync_jvms()); // sync_jvms used to get current bci 3508 3509 // Add monitor to debug info for the slow path. If we block inside the 3510 // slow path and de-opt, we need the monitor hanging around 3511 map()->push_monitor( flock ); 3512 3513 const TypeFunc *tf = LockNode::lock_type(); 3514 LockNode *lock = new LockNode(C, tf); 3515 3516 lock->init_req( TypeFunc::Control, control() ); 3517 lock->init_req( TypeFunc::Memory , mem ); 3518 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o 3519 lock->init_req( TypeFunc::FramePtr, frameptr() ); 3520 lock->init_req( TypeFunc::ReturnAdr, top() ); 3521 3522 lock->init_req(TypeFunc::Parms + 0, obj); 3523 lock->init_req(TypeFunc::Parms + 1, box); 3524 lock->init_req(TypeFunc::Parms + 2, flock); 3525 add_safepoint_edges(lock); 3526 3527 lock = _gvn.transform( lock )->as_Lock(); 3528 3529 // lock has no side-effects, sets few values 3530 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM); 3531 3532 insert_mem_bar(Op_MemBarAcquireLock); 3533 3534 // Add this to the worklist so that the lock can be eliminated 3535 record_for_igvn(lock); 3536 3537 #ifndef PRODUCT 3538 if (PrintLockStatistics) { 3539 // Update the counter for this lock. Don't bother using an atomic 3540 // operation since we don't require absolute accuracy. 3541 lock->create_lock_counter(map()->jvms()); 3542 increment_counter(lock->counter()->addr()); 3543 } 3544 #endif 3545 3546 return flock; 3547 } 3548 3549 3550 //------------------------------shared_unlock---------------------------------- 3551 // Emit unlocking code. 3552 void GraphKit::shared_unlock(Node* box, Node* obj) { 3553 // bci is either a monitorenter bc or InvocationEntryBci 3554 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces 3555 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); 3556 3557 if( !GenerateSynchronizationCode ) 3558 return; 3559 if (stopped()) { // Dead monitor? 3560 map()->pop_monitor(); // Kill monitor from debug info 3561 return; 3562 } 3563 assert(!obj->is_ValueTypeBase(), "should not unlock on value type"); 3564 3565 // Memory barrier to avoid floating things down past the locked region 3566 insert_mem_bar(Op_MemBarReleaseLock); 3567 3568 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type(); 3569 UnlockNode *unlock = new UnlockNode(C, tf); 3570 #ifdef ASSERT 3571 unlock->set_dbg_jvms(sync_jvms()); 3572 #endif 3573 uint raw_idx = Compile::AliasIdxRaw; 3574 unlock->init_req( TypeFunc::Control, control() ); 3575 unlock->init_req( TypeFunc::Memory , memory(raw_idx) ); 3576 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o 3577 unlock->init_req( TypeFunc::FramePtr, frameptr() ); 3578 unlock->init_req( TypeFunc::ReturnAdr, top() ); 3579 3580 unlock->init_req(TypeFunc::Parms + 0, obj); 3581 unlock->init_req(TypeFunc::Parms + 1, box); 3582 unlock = _gvn.transform(unlock)->as_Unlock(); 3583 3584 Node* mem = reset_memory(); 3585 3586 // unlock has no side-effects, sets few values 3587 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM); 3588 3589 // Kill monitor from debug info 3590 map()->pop_monitor( ); 3591 } 3592 3593 //-------------------------------get_layout_helper----------------------------- 3594 // If the given klass is a constant or known to be an array, 3595 // fetch the constant layout helper value into constant_value 3596 // and return (Node*)NULL. Otherwise, load the non-constant 3597 // layout helper value, and return the node which represents it. 3598 // This two-faced routine is useful because allocation sites 3599 // almost always feature constant types. 3600 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) { 3601 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr(); 3602 if (!StressReflectiveCode && inst_klass != NULL) { 3603 ciKlass* klass = inst_klass->klass(); 3604 assert(klass != NULL, "klass should not be NULL"); 3605 bool xklass = inst_klass->klass_is_exact(); 3606 bool can_be_value_array = false; 3607 if (klass->is_array_klass() && EnableValhalla && ValueArrayFlatten) { 3608 ciKlass* elem = klass->as_array_klass()->element_klass(); 3609 can_be_value_array = elem != NULL && (elem->is_java_lang_Object() || elem->is_interface()); 3610 } 3611 if (xklass || (klass->is_array_klass() && !can_be_value_array)) { 3612 jint lhelper = klass->layout_helper(); 3613 if (lhelper != Klass::_lh_neutral_value) { 3614 constant_value = lhelper; 3615 return (Node*) NULL; 3616 } 3617 } 3618 } 3619 constant_value = Klass::_lh_neutral_value; // put in a known value 3620 Node* lhp = basic_plus_adr(klass_node, klass_node, in_bytes(Klass::layout_helper_offset())); 3621 return make_load(NULL, lhp, TypeInt::INT, T_INT, MemNode::unordered); 3622 } 3623 3624 // We just put in an allocate/initialize with a big raw-memory effect. 3625 // Hook selected additional alias categories on the initialization. 3626 static void hook_memory_on_init(GraphKit& kit, int alias_idx, 3627 MergeMemNode* init_in_merge, 3628 Node* init_out_raw) { 3629 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory()); 3630 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, ""); 3631 3632 Node* prevmem = kit.memory(alias_idx); 3633 init_in_merge->set_memory_at(alias_idx, prevmem); 3634 kit.set_memory(init_out_raw, alias_idx); 3635 } 3636 3637 //---------------------------set_output_for_allocation------------------------- 3638 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc, 3639 const TypeOopPtr* oop_type, 3640 bool deoptimize_on_exception) { 3641 int rawidx = Compile::AliasIdxRaw; 3642 alloc->set_req( TypeFunc::FramePtr, frameptr() ); 3643 add_safepoint_edges(alloc); 3644 Node* allocx = _gvn.transform(alloc); 3645 set_control( _gvn.transform(new ProjNode(allocx, TypeFunc::Control) ) ); 3646 // create memory projection for i_o 3647 set_memory ( _gvn.transform( new ProjNode(allocx, TypeFunc::Memory, true) ), rawidx ); 3648 make_slow_call_ex(allocx, env()->Throwable_klass(), true, deoptimize_on_exception); 3649 3650 // create a memory projection as for the normal control path 3651 Node* malloc = _gvn.transform(new ProjNode(allocx, TypeFunc::Memory)); 3652 set_memory(malloc, rawidx); 3653 3654 // a normal slow-call doesn't change i_o, but an allocation does 3655 // we create a separate i_o projection for the normal control path 3656 set_i_o(_gvn.transform( new ProjNode(allocx, TypeFunc::I_O, false) ) ); 3657 Node* rawoop = _gvn.transform( new ProjNode(allocx, TypeFunc::Parms) ); 3658 3659 // put in an initialization barrier 3660 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx, 3661 rawoop)->as_Initialize(); 3662 assert(alloc->initialization() == init, "2-way macro link must work"); 3663 assert(init ->allocation() == alloc, "2-way macro link must work"); 3664 { 3665 // Extract memory strands which may participate in the new object's 3666 // initialization, and source them from the new InitializeNode. 3667 // This will allow us to observe initializations when they occur, 3668 // and link them properly (as a group) to the InitializeNode. 3669 assert(init->in(InitializeNode::Memory) == malloc, ""); 3670 MergeMemNode* minit_in = MergeMemNode::make(malloc); 3671 init->set_req(InitializeNode::Memory, minit_in); 3672 record_for_igvn(minit_in); // fold it up later, if possible 3673 Node* minit_out = memory(rawidx); 3674 assert(minit_out->is_Proj() && minit_out->in(0) == init, ""); 3675 if (oop_type->isa_aryptr()) { 3676 const TypeAryPtr* arytype = oop_type->is_aryptr(); 3677 if (arytype->klass()->is_value_array_klass()) { 3678 ciValueArrayKlass* vak = arytype->klass()->as_value_array_klass(); 3679 ciValueKlass* vk = vak->element_klass()->as_value_klass(); 3680 for (int i = 0, len = vk->nof_nonstatic_fields(); i < len; i++) { 3681 ciField* field = vk->nonstatic_field_at(i); 3682 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) 3683 continue; // do not bother to track really large numbers of fields 3684 int off_in_vt = field->offset() - vk->first_field_offset(); 3685 const TypePtr* adr_type = arytype->with_field_offset(off_in_vt)->add_offset(Type::OffsetBot); 3686 int fieldidx = C->get_alias_index(adr_type); 3687 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); 3688 } 3689 } else { 3690 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot); 3691 int elemidx = C->get_alias_index(telemref); 3692 hook_memory_on_init(*this, elemidx, minit_in, minit_out); 3693 } 3694 } else if (oop_type->isa_instptr()) { 3695 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass(); 3696 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) { 3697 ciField* field = ik->nonstatic_field_at(i); 3698 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) 3699 continue; // do not bother to track really large numbers of fields 3700 // Find (or create) the alias category for this field: 3701 int fieldidx = C->alias_type(field)->index(); 3702 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); 3703 } 3704 } 3705 } 3706 3707 // Cast raw oop to the real thing... 3708 Node* javaoop = new CheckCastPPNode(control(), rawoop, oop_type); 3709 javaoop = _gvn.transform(javaoop); 3710 C->set_recent_alloc(control(), javaoop); 3711 assert(just_allocated_object(control()) == javaoop, "just allocated"); 3712 3713 #ifdef ASSERT 3714 { // Verify that the AllocateNode::Ideal_allocation recognizers work: 3715 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc, 3716 "Ideal_allocation works"); 3717 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc, 3718 "Ideal_allocation works"); 3719 if (alloc->is_AllocateArray()) { 3720 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(), 3721 "Ideal_allocation works"); 3722 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(), 3723 "Ideal_allocation works"); 3724 } else { 3725 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please"); 3726 } 3727 } 3728 #endif //ASSERT 3729 3730 return javaoop; 3731 } 3732 3733 //---------------------------new_instance-------------------------------------- 3734 // This routine takes a klass_node which may be constant (for a static type) 3735 // or may be non-constant (for reflective code). It will work equally well 3736 // for either, and the graph will fold nicely if the optimizer later reduces 3737 // the type to a constant. 3738 // The optional arguments are for specialized use by intrinsics: 3739 // - If 'extra_slow_test' if not null is an extra condition for the slow-path. 3740 // - If 'return_size_val', report the the total object size to the caller. 3741 // - deoptimize_on_exception controls how Java exceptions are handled (rethrow vs deoptimize) 3742 Node* GraphKit::new_instance(Node* klass_node, 3743 Node* extra_slow_test, 3744 Node* *return_size_val, 3745 bool deoptimize_on_exception, 3746 ValueTypeBaseNode* value_node) { 3747 // Compute size in doublewords 3748 // The size is always an integral number of doublewords, represented 3749 // as a positive bytewise size stored in the klass's layout_helper. 3750 // The layout_helper also encodes (in a low bit) the need for a slow path. 3751 jint layout_con = Klass::_lh_neutral_value; 3752 Node* layout_val = get_layout_helper(klass_node, layout_con); 3753 bool layout_is_con = (layout_val == NULL); 3754 3755 if (extra_slow_test == NULL) extra_slow_test = intcon(0); 3756 // Generate the initial go-slow test. It's either ALWAYS (return a 3757 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective 3758 // case) a computed value derived from the layout_helper. 3759 Node* initial_slow_test = NULL; 3760 if (layout_is_con) { 3761 assert(!StressReflectiveCode, "stress mode does not use these paths"); 3762 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con); 3763 initial_slow_test = must_go_slow ? intcon(1) : extra_slow_test; 3764 } else { // reflective case 3765 // This reflective path is used by Unsafe.allocateInstance. 3766 // (It may be stress-tested by specifying StressReflectiveCode.) 3767 // Basically, we want to get into the VM is there's an illegal argument. 3768 Node* bit = intcon(Klass::_lh_instance_slow_path_bit); 3769 initial_slow_test = _gvn.transform( new AndINode(layout_val, bit) ); 3770 if (extra_slow_test != intcon(0)) { 3771 initial_slow_test = _gvn.transform( new OrINode(initial_slow_test, extra_slow_test) ); 3772 } 3773 // (Macro-expander will further convert this to a Bool, if necessary.) 3774 } 3775 3776 // Find the size in bytes. This is easy; it's the layout_helper. 3777 // The size value must be valid even if the slow path is taken. 3778 Node* size = NULL; 3779 if (layout_is_con) { 3780 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con)); 3781 } else { // reflective case 3782 // This reflective path is used by clone and Unsafe.allocateInstance. 3783 size = ConvI2X(layout_val); 3784 3785 // Clear the low bits to extract layout_helper_size_in_bytes: 3786 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit"); 3787 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong)); 3788 size = _gvn.transform( new AndXNode(size, mask) ); 3789 } 3790 if (return_size_val != NULL) { 3791 (*return_size_val) = size; 3792 } 3793 3794 // This is a precise notnull oop of the klass. 3795 // (Actually, it need not be precise if this is a reflective allocation.) 3796 // It's what we cast the result to. 3797 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr(); 3798 if (!tklass) tklass = TypeKlassPtr::OBJECT; 3799 const TypeOopPtr* oop_type = tklass->as_instance_type(); 3800 3801 // Now generate allocation code 3802 3803 // The entire memory state is needed for slow path of the allocation 3804 // since GC and deoptimization can happen. 3805 Node *mem = reset_memory(); 3806 set_all_memory(mem); // Create new memory state 3807 3808 AllocateNode* alloc = new AllocateNode(C, AllocateNode::alloc_type(Type::TOP), 3809 control(), mem, i_o(), 3810 size, klass_node, 3811 initial_slow_test, value_node); 3812 3813 return set_output_for_allocation(alloc, oop_type, deoptimize_on_exception); 3814 } 3815 3816 // With compressed oops, the 64 bit init value for non flattened value 3817 // arrays is built from 2 32 bit compressed oops 3818 static Node* raw_default_for_coops(Node* default_value, GraphKit& kit) { 3819 Node* lower = kit.gvn().transform(new CastP2XNode(kit.control(), default_value)); 3820 Node* upper = kit.gvn().transform(new LShiftLNode(lower, kit.intcon(32))); 3821 return kit.gvn().transform(new OrLNode(lower, upper)); 3822 } 3823 3824 //-------------------------------new_array------------------------------------- 3825 // helper for newarray and anewarray 3826 // The 'length' parameter is (obviously) the length of the array. 3827 // See comments on new_instance for the meaning of the other arguments. 3828 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable) 3829 Node* length, // number of array elements 3830 int nargs, // number of arguments to push back for uncommon trap 3831 Node* *return_size_val, 3832 bool deoptimize_on_exception) { 3833 jint layout_con = Klass::_lh_neutral_value; 3834 Node* layout_val = get_layout_helper(klass_node, layout_con); 3835 bool layout_is_con = (layout_val == NULL); 3836 3837 if (!layout_is_con && !StressReflectiveCode && 3838 !too_many_traps(Deoptimization::Reason_class_check)) { 3839 // This is a reflective array creation site. 3840 // Optimistically assume that it is a subtype of Object[], 3841 // so that we can fold up all the address arithmetic. 3842 layout_con = Klass::array_layout_helper(T_OBJECT); 3843 Node* cmp_lh = _gvn.transform( new CmpINode(layout_val, intcon(layout_con)) ); 3844 Node* bol_lh = _gvn.transform( new BoolNode(cmp_lh, BoolTest::eq) ); 3845 { BuildCutout unless(this, bol_lh, PROB_MAX); 3846 inc_sp(nargs); 3847 uncommon_trap(Deoptimization::Reason_class_check, 3848 Deoptimization::Action_maybe_recompile); 3849 } 3850 layout_val = NULL; 3851 layout_is_con = true; 3852 } 3853 3854 // Generate the initial go-slow test. Make sure we do not overflow 3855 // if length is huge (near 2Gig) or negative! We do not need 3856 // exact double-words here, just a close approximation of needed 3857 // double-words. We can't add any offset or rounding bits, lest we 3858 // take a size -1 of bytes and make it positive. Use an unsigned 3859 // compare, so negative sizes look hugely positive. 3860 int fast_size_limit = FastAllocateSizeLimit; 3861 if (layout_is_con) { 3862 assert(!StressReflectiveCode, "stress mode does not use these paths"); 3863 // Increase the size limit if we have exact knowledge of array type. 3864 int log2_esize = Klass::layout_helper_log2_element_size(layout_con); 3865 fast_size_limit <<= MAX2(LogBytesPerLong - log2_esize, 0); 3866 } 3867 3868 Node* initial_slow_cmp = _gvn.transform( new CmpUNode( length, intcon( fast_size_limit ) ) ); 3869 Node* initial_slow_test = _gvn.transform( new BoolNode( initial_slow_cmp, BoolTest::gt ) ); 3870 3871 // --- Size Computation --- 3872 // array_size = round_to_heap(array_header + (length << elem_shift)); 3873 // where round_to_heap(x) == align_to(x, MinObjAlignmentInBytes) 3874 // and align_to(x, y) == ((x + y-1) & ~(y-1)) 3875 // The rounding mask is strength-reduced, if possible. 3876 int round_mask = MinObjAlignmentInBytes - 1; 3877 Node* header_size = NULL; 3878 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); 3879 // (T_BYTE has the weakest alignment and size restrictions...) 3880 if (layout_is_con) { 3881 int hsize = Klass::layout_helper_header_size(layout_con); 3882 int eshift = Klass::layout_helper_log2_element_size(layout_con); 3883 BasicType etype = Klass::layout_helper_element_type(layout_con); 3884 bool is_value_array = Klass::layout_helper_is_valueArray(layout_con); 3885 if ((round_mask & ~right_n_bits(eshift)) == 0) 3886 round_mask = 0; // strength-reduce it if it goes away completely 3887 assert(is_value_array || (hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded"); 3888 assert(header_size_min <= hsize, "generic minimum is smallest"); 3889 header_size_min = hsize; 3890 header_size = intcon(hsize + round_mask); 3891 } else { 3892 Node* hss = intcon(Klass::_lh_header_size_shift); 3893 Node* hsm = intcon(Klass::_lh_header_size_mask); 3894 Node* hsize = _gvn.transform( new URShiftINode(layout_val, hss) ); 3895 hsize = _gvn.transform( new AndINode(hsize, hsm) ); 3896 Node* mask = intcon(round_mask); 3897 header_size = _gvn.transform( new AddINode(hsize, mask) ); 3898 } 3899 3900 Node* elem_shift = NULL; 3901 if (layout_is_con) { 3902 int eshift = Klass::layout_helper_log2_element_size(layout_con); 3903 if (eshift != 0) 3904 elem_shift = intcon(eshift); 3905 } else { 3906 // There is no need to mask or shift this value. 3907 // The semantics of LShiftINode include an implicit mask to 0x1F. 3908 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place"); 3909 elem_shift = layout_val; 3910 } 3911 3912 // Transition to native address size for all offset calculations: 3913 Node* lengthx = ConvI2X(length); 3914 Node* headerx = ConvI2X(header_size); 3915 #ifdef _LP64 3916 { const TypeInt* tilen = _gvn.find_int_type(length); 3917 if (tilen != NULL && tilen->_lo < 0) { 3918 // Add a manual constraint to a positive range. Cf. array_element_address. 3919 jint size_max = fast_size_limit; 3920 if (size_max > tilen->_hi) size_max = tilen->_hi; 3921 const TypeInt* tlcon = TypeInt::make(0, size_max, Type::WidenMin); 3922 3923 // Only do a narrow I2L conversion if the range check passed. 3924 IfNode* iff = new IfNode(control(), initial_slow_test, PROB_MIN, COUNT_UNKNOWN); 3925 _gvn.transform(iff); 3926 RegionNode* region = new RegionNode(3); 3927 _gvn.set_type(region, Type::CONTROL); 3928 lengthx = new PhiNode(region, TypeLong::LONG); 3929 _gvn.set_type(lengthx, TypeLong::LONG); 3930 3931 // Range check passed. Use ConvI2L node with narrow type. 3932 Node* passed = IfFalse(iff); 3933 region->init_req(1, passed); 3934 // Make I2L conversion control dependent to prevent it from 3935 // floating above the range check during loop optimizations. 3936 lengthx->init_req(1, C->constrained_convI2L(&_gvn, length, tlcon, passed)); 3937 3938 // Range check failed. Use ConvI2L with wide type because length may be invalid. 3939 region->init_req(2, IfTrue(iff)); 3940 lengthx->init_req(2, ConvI2X(length)); 3941 3942 set_control(region); 3943 record_for_igvn(region); 3944 record_for_igvn(lengthx); 3945 } 3946 } 3947 #endif 3948 3949 // Combine header size (plus rounding) and body size. Then round down. 3950 // This computation cannot overflow, because it is used only in two 3951 // places, one where the length is sharply limited, and the other 3952 // after a successful allocation. 3953 Node* abody = lengthx; 3954 if (elem_shift != NULL) 3955 abody = _gvn.transform( new LShiftXNode(lengthx, elem_shift) ); 3956 Node* size = _gvn.transform( new AddXNode(headerx, abody) ); 3957 if (round_mask != 0) { 3958 Node* mask = MakeConX(~round_mask); 3959 size = _gvn.transform( new AndXNode(size, mask) ); 3960 } 3961 // else if round_mask == 0, the size computation is self-rounding 3962 3963 if (return_size_val != NULL) { 3964 // This is the size 3965 (*return_size_val) = size; 3966 } 3967 3968 // Now generate allocation code 3969 3970 // The entire memory state is needed for slow path of the allocation 3971 // since GC and deoptimization can happen. 3972 Node *mem = reset_memory(); 3973 set_all_memory(mem); // Create new memory state 3974 3975 if (initial_slow_test->is_Bool()) { 3976 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick. 3977 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn); 3978 } 3979 3980 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type(); 3981 const TypeAryPtr* ary_ptr = ary_type->isa_aryptr(); 3982 const Type* elem = NULL; 3983 ciKlass* elem_klass = NULL; 3984 if (ary_ptr != NULL) { 3985 elem = ary_ptr->elem(); 3986 elem_klass = ary_ptr->klass()->as_array_klass()->element_klass(); 3987 } 3988 Node* default_value = NULL; 3989 Node* raw_default_value = NULL; 3990 if (elem != NULL && elem->make_ptr()) { 3991 if (elem_klass != NULL && elem_klass->is_valuetype()) { 3992 ciValueKlass* vk = elem_klass->as_value_klass(); 3993 if (!vk->flatten_array()) { 3994 default_value = ValueTypeNode::default_oop(gvn(), vk); 3995 if (elem->isa_narrowoop()) { 3996 default_value = _gvn.transform(new EncodePNode(default_value, elem)); 3997 raw_default_value = raw_default_for_coops(default_value, *this); 3998 } else { 3999 raw_default_value = _gvn.transform(new CastP2XNode(control(), default_value)); 4000 } 4001 } 4002 } 4003 } 4004 4005 if (EnableValhalla && (!layout_con || elem == NULL || (elem_klass != NULL && elem_klass->is_java_lang_Object() && !ary_type->klass_is_exact()))) { 4006 assert(raw_default_value == NULL, "shouldn't be set yet"); 4007 4008 // unkown array type, could be a non flattened value array that's 4009 // initialize to a non zero default value 4010 4011 Node* r = new RegionNode(4); 4012 Node* phi = new PhiNode(r, TypeX_X); 4013 4014 Node* cmp = gen_lh_array_test(klass_node, Klass::_lh_array_tag_obj_value); 4015 Node* bol = _gvn.transform(new BoolNode(cmp, BoolTest::eq)); 4016 IfNode* iff = create_and_map_if(control(), bol, PROB_FAIR, COUNT_UNKNOWN); 4017 r->init_req(1, _gvn.transform(new IfFalseNode(iff))); 4018 phi->init_req(1, MakeConX(0)); 4019 set_control(_gvn.transform(new IfTrueNode(iff))); 4020 Node* k_adr = basic_plus_adr(klass_node, in_bytes(ArrayKlass::element_klass_offset())); 4021 Node* elem_klass = _gvn.transform(LoadKlassNode::make(_gvn, control(), immutable_memory(), k_adr, TypeInstPtr::KLASS)); 4022 cmp = gen_value_type_test(elem_klass); 4023 bol = _gvn.transform(new BoolNode(cmp, BoolTest::eq)); 4024 iff = create_and_map_if(control(), bol, PROB_FAIR, COUNT_UNKNOWN); 4025 r->init_req(2, _gvn.transform(new IfTrueNode(iff))); 4026 phi->init_req(2, MakeConX(0)); 4027 set_control(_gvn.transform(new IfFalseNode(iff))); 4028 4029 Node* adr_fixed_block_addr = basic_plus_adr(elem_klass, in_bytes(InstanceKlass::adr_valueklass_fixed_block_offset())); 4030 Node* adr_fixed_block = make_load(control(), adr_fixed_block_addr, TypeRawPtr::NOTNULL, T_ADDRESS, MemNode::unordered); 4031 4032 Node* default_value_offset_addr = basic_plus_adr(adr_fixed_block, in_bytes(ValueKlass::default_value_offset_offset())); 4033 Node* default_value_offset = make_load(control(), default_value_offset_addr, TypeInt::INT, T_INT, MemNode::unordered); 4034 4035 Node* elem_mirror = load_mirror_from_klass(elem_klass); 4036 4037 Node* default_value_addr = basic_plus_adr(elem_mirror, ConvI2X(default_value_offset)); 4038 const TypePtr* adr_type = _gvn.type(default_value_addr)->is_ptr(); 4039 Node* val = access_load_at(elem_mirror, default_value_addr, adr_type, TypeInstPtr::BOTTOM, T_OBJECT, IN_HEAP); 4040 4041 if (UseCompressedOops) { 4042 val = _gvn.transform(new EncodePNode(val, elem)); 4043 val = raw_default_for_coops(val, *this); 4044 } else { 4045 val = _gvn.transform(new CastP2XNode(control(), val)); 4046 } 4047 r->init_req(3, control()); 4048 phi->init_req(3, val); 4049 set_control(_gvn.transform(r)); 4050 raw_default_value = _gvn.transform(phi); 4051 } 4052 4053 // Create the AllocateArrayNode and its result projections 4054 AllocateArrayNode* alloc 4055 = new AllocateArrayNode(C, AllocateArrayNode::alloc_type(TypeInt::INT), 4056 control(), mem, i_o(), 4057 size, klass_node, 4058 initial_slow_test, 4059 length, default_value, 4060 raw_default_value); 4061 4062 // Cast to correct type. Note that the klass_node may be constant or not, 4063 // and in the latter case the actual array type will be inexact also. 4064 // (This happens via a non-constant argument to inline_native_newArray.) 4065 // In any case, the value of klass_node provides the desired array type. 4066 const TypeInt* length_type = _gvn.find_int_type(length); 4067 if (ary_type->isa_aryptr() && length_type != NULL) { 4068 // Try to get a better type than POS for the size 4069 ary_type = ary_type->is_aryptr()->cast_to_size(length_type); 4070 } 4071 4072 Node* javaoop = set_output_for_allocation(alloc, ary_type, deoptimize_on_exception); 4073 4074 // Cast length on remaining path to be as narrow as possible 4075 if (map()->find_edge(length) >= 0) { 4076 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn); 4077 if (ccast != length) { 4078 _gvn.set_type_bottom(ccast); 4079 record_for_igvn(ccast); 4080 replace_in_map(length, ccast); 4081 } 4082 } 4083 4084 return javaoop; 4085 } 4086 4087 // The following "Ideal_foo" functions are placed here because they recognize 4088 // the graph shapes created by the functions immediately above. 4089 4090 //---------------------------Ideal_allocation---------------------------------- 4091 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode. 4092 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) { 4093 if (ptr == NULL) { // reduce dumb test in callers 4094 return NULL; 4095 } 4096 if (ptr->is_CheckCastPP()) { // strip only one raw-to-oop cast 4097 ptr = ptr->in(1); 4098 if (ptr == NULL) return NULL; 4099 } 4100 // Return NULL for allocations with several casts: 4101 // j.l.reflect.Array.newInstance(jobject, jint) 4102 // Object.clone() 4103 // to keep more precise type from last cast. 4104 if (ptr->is_Proj()) { 4105 Node* allo = ptr->in(0); 4106 if (allo != NULL && allo->is_Allocate()) { 4107 return allo->as_Allocate(); 4108 } 4109 } 4110 // Report failure to match. 4111 return NULL; 4112 } 4113 4114 // Fancy version which also strips off an offset (and reports it to caller). 4115 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase, 4116 intptr_t& offset) { 4117 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset); 4118 if (base == NULL) return NULL; 4119 return Ideal_allocation(base, phase); 4120 } 4121 4122 // Trace Initialize <- Proj[Parm] <- Allocate 4123 AllocateNode* InitializeNode::allocation() { 4124 Node* rawoop = in(InitializeNode::RawAddress); 4125 if (rawoop->is_Proj()) { 4126 Node* alloc = rawoop->in(0); 4127 if (alloc->is_Allocate()) { 4128 return alloc->as_Allocate(); 4129 } 4130 } 4131 return NULL; 4132 } 4133 4134 // Trace Allocate -> Proj[Parm] -> Initialize 4135 InitializeNode* AllocateNode::initialization() { 4136 ProjNode* rawoop = proj_out_or_null(AllocateNode::RawAddress); 4137 if (rawoop == NULL) return NULL; 4138 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { 4139 Node* init = rawoop->fast_out(i); 4140 if (init->is_Initialize()) { 4141 assert(init->as_Initialize()->allocation() == this, "2-way link"); 4142 return init->as_Initialize(); 4143 } 4144 } 4145 return NULL; 4146 } 4147 4148 //----------------------------- loop predicates --------------------------- 4149 4150 //------------------------------add_predicate_impl---------------------------- 4151 void GraphKit::add_predicate_impl(Deoptimization::DeoptReason reason, int nargs) { 4152 // Too many traps seen? 4153 if (too_many_traps(reason)) { 4154 #ifdef ASSERT 4155 if (TraceLoopPredicate) { 4156 int tc = C->trap_count(reason); 4157 tty->print("too many traps=%s tcount=%d in ", 4158 Deoptimization::trap_reason_name(reason), tc); 4159 method()->print(); // which method has too many predicate traps 4160 tty->cr(); 4161 } 4162 #endif 4163 // We cannot afford to take more traps here, 4164 // do not generate predicate. 4165 return; 4166 } 4167 4168 Node *cont = _gvn.intcon(1); 4169 Node* opq = _gvn.transform(new Opaque1Node(C, cont)); 4170 Node *bol = _gvn.transform(new Conv2BNode(opq)); 4171 IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN); 4172 Node* iffalse = _gvn.transform(new IfFalseNode(iff)); 4173 C->add_predicate_opaq(opq); 4174 { 4175 PreserveJVMState pjvms(this); 4176 set_control(iffalse); 4177 inc_sp(nargs); 4178 uncommon_trap(reason, Deoptimization::Action_maybe_recompile); 4179 } 4180 Node* iftrue = _gvn.transform(new IfTrueNode(iff)); 4181 set_control(iftrue); 4182 } 4183 4184 //------------------------------add_predicate--------------------------------- 4185 void GraphKit::add_predicate(int nargs) { 4186 if (UseLoopPredicate) { 4187 add_predicate_impl(Deoptimization::Reason_predicate, nargs); 4188 } 4189 if (UseProfiledLoopPredicate) { 4190 add_predicate_impl(Deoptimization::Reason_profile_predicate, nargs); 4191 } 4192 // loop's limit check predicate should be near the loop. 4193 add_predicate_impl(Deoptimization::Reason_loop_limit_check, nargs); 4194 } 4195 4196 void GraphKit::sync_kit(IdealKit& ideal) { 4197 set_all_memory(ideal.merged_memory()); 4198 set_i_o(ideal.i_o()); 4199 set_control(ideal.ctrl()); 4200 } 4201 4202 void GraphKit::final_sync(IdealKit& ideal) { 4203 // Final sync IdealKit and graphKit. 4204 sync_kit(ideal); 4205 } 4206 4207 Node* GraphKit::load_String_length(Node* ctrl, Node* str) { 4208 Node* len = load_array_length(load_String_value(ctrl, str)); 4209 Node* coder = load_String_coder(ctrl, str); 4210 // Divide length by 2 if coder is UTF16 4211 return _gvn.transform(new RShiftINode(len, coder)); 4212 } 4213 4214 Node* GraphKit::load_String_value(Node* ctrl, Node* str) { 4215 int value_offset = java_lang_String::value_offset_in_bytes(); 4216 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 4217 false, NULL, Type::Offset(0)); 4218 const TypePtr* value_field_type = string_type->add_offset(value_offset); 4219 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, 4220 TypeAry::make(TypeInt::BYTE, TypeInt::POS), 4221 ciTypeArrayKlass::make(T_BYTE), true, Type::Offset(0)); 4222 Node* p = basic_plus_adr(str, str, value_offset); 4223 Node* load = access_load_at(str, p, value_field_type, value_type, T_OBJECT, 4224 IN_HEAP | C2_CONTROL_DEPENDENT_LOAD); 4225 // String.value field is known to be @Stable. 4226 if (UseImplicitStableValues) { 4227 load = cast_array_to_stable(load, value_type); 4228 } 4229 return load; 4230 } 4231 4232 Node* GraphKit::load_String_coder(Node* ctrl, Node* str) { 4233 if (!CompactStrings) { 4234 return intcon(java_lang_String::CODER_UTF16); 4235 } 4236 int coder_offset = java_lang_String::coder_offset_in_bytes(); 4237 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 4238 false, NULL, Type::Offset(0)); 4239 const TypePtr* coder_field_type = string_type->add_offset(coder_offset); 4240 int coder_field_idx = C->get_alias_index(coder_field_type); 4241 return make_load(ctrl, basic_plus_adr(str, str, coder_offset), 4242 TypeInt::BYTE, T_BYTE, coder_field_idx, MemNode::unordered); 4243 } 4244 4245 void GraphKit::store_String_value(Node* ctrl, Node* str, Node* value) { 4246 int value_offset = java_lang_String::value_offset_in_bytes(); 4247 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 4248 false, NULL, Type::Offset(0)); 4249 const TypePtr* value_field_type = string_type->add_offset(value_offset); 4250 access_store_at(ctrl, str, basic_plus_adr(str, value_offset), value_field_type, 4251 value, TypeAryPtr::BYTES, T_OBJECT, IN_HEAP); 4252 } 4253 4254 void GraphKit::store_String_coder(Node* ctrl, Node* str, Node* value) { 4255 int coder_offset = java_lang_String::coder_offset_in_bytes(); 4256 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 4257 false, NULL, Type::Offset(0)); 4258 const TypePtr* coder_field_type = string_type->add_offset(coder_offset); 4259 int coder_field_idx = C->get_alias_index(coder_field_type); 4260 store_to_memory(ctrl, basic_plus_adr(str, coder_offset), 4261 value, T_BYTE, coder_field_idx, MemNode::unordered); 4262 } 4263 4264 // Capture src and dst memory state with a MergeMemNode 4265 Node* GraphKit::capture_memory(const TypePtr* src_type, const TypePtr* dst_type) { 4266 if (src_type == dst_type) { 4267 // Types are equal, we don't need a MergeMemNode 4268 return memory(src_type); 4269 } 4270 MergeMemNode* merge = MergeMemNode::make(map()->memory()); 4271 record_for_igvn(merge); // fold it up later, if possible 4272 int src_idx = C->get_alias_index(src_type); 4273 int dst_idx = C->get_alias_index(dst_type); 4274 merge->set_memory_at(src_idx, memory(src_idx)); 4275 merge->set_memory_at(dst_idx, memory(dst_idx)); 4276 return merge; 4277 } 4278 4279 Node* GraphKit::compress_string(Node* src, const TypeAryPtr* src_type, Node* dst, Node* count) { 4280 assert(Matcher::match_rule_supported(Op_StrCompressedCopy), "Intrinsic not supported"); 4281 assert(src_type == TypeAryPtr::BYTES || src_type == TypeAryPtr::CHARS, "invalid source type"); 4282 // If input and output memory types differ, capture both states to preserve 4283 // the dependency between preceding and subsequent loads/stores. 4284 // For example, the following program: 4285 // StoreB 4286 // compress_string 4287 // LoadB 4288 // has this memory graph (use->def): 4289 // LoadB -> compress_string -> CharMem 4290 // ... -> StoreB -> ByteMem 4291 // The intrinsic hides the dependency between LoadB and StoreB, causing 4292 // the load to read from memory not containing the result of the StoreB. 4293 // The correct memory graph should look like this: 4294 // LoadB -> compress_string -> MergeMem(CharMem, StoreB(ByteMem)) 4295 Node* mem = capture_memory(src_type, TypeAryPtr::BYTES); 4296 StrCompressedCopyNode* str = new StrCompressedCopyNode(control(), mem, src, dst, count); 4297 Node* res_mem = _gvn.transform(new SCMemProjNode(str)); 4298 set_memory(res_mem, TypeAryPtr::BYTES); 4299 return str; 4300 } 4301 4302 void GraphKit::inflate_string(Node* src, Node* dst, const TypeAryPtr* dst_type, Node* count) { 4303 assert(Matcher::match_rule_supported(Op_StrInflatedCopy), "Intrinsic not supported"); 4304 assert(dst_type == TypeAryPtr::BYTES || dst_type == TypeAryPtr::CHARS, "invalid dest type"); 4305 // Capture src and dst memory (see comment in 'compress_string'). 4306 Node* mem = capture_memory(TypeAryPtr::BYTES, dst_type); 4307 StrInflatedCopyNode* str = new StrInflatedCopyNode(control(), mem, src, dst, count); 4308 set_memory(_gvn.transform(str), dst_type); 4309 } 4310 4311 void GraphKit::inflate_string_slow(Node* src, Node* dst, Node* start, Node* count) { 4312 /** 4313 * int i_char = start; 4314 * for (int i_byte = 0; i_byte < count; i_byte++) { 4315 * dst[i_char++] = (char)(src[i_byte] & 0xff); 4316 * } 4317 */ 4318 add_predicate(); 4319 RegionNode* head = new RegionNode(3); 4320 head->init_req(1, control()); 4321 gvn().set_type(head, Type::CONTROL); 4322 record_for_igvn(head); 4323 4324 Node* i_byte = new PhiNode(head, TypeInt::INT); 4325 i_byte->init_req(1, intcon(0)); 4326 gvn().set_type(i_byte, TypeInt::INT); 4327 record_for_igvn(i_byte); 4328 4329 Node* i_char = new PhiNode(head, TypeInt::INT); 4330 i_char->init_req(1, start); 4331 gvn().set_type(i_char, TypeInt::INT); 4332 record_for_igvn(i_char); 4333 4334 Node* mem = PhiNode::make(head, memory(TypeAryPtr::BYTES), Type::MEMORY, TypeAryPtr::BYTES); 4335 gvn().set_type(mem, Type::MEMORY); 4336 record_for_igvn(mem); 4337 set_control(head); 4338 set_memory(mem, TypeAryPtr::BYTES); 4339 Node* ch = load_array_element(control(), src, i_byte, TypeAryPtr::BYTES); 4340 Node* st = store_to_memory(control(), array_element_address(dst, i_char, T_BYTE), 4341 AndI(ch, intcon(0xff)), T_CHAR, TypeAryPtr::BYTES, MemNode::unordered, 4342 false, false, true /* mismatched */); 4343 4344 IfNode* iff = create_and_map_if(head, Bool(CmpI(i_byte, count), BoolTest::lt), PROB_FAIR, COUNT_UNKNOWN); 4345 head->init_req(2, IfTrue(iff)); 4346 mem->init_req(2, st); 4347 i_byte->init_req(2, AddI(i_byte, intcon(1))); 4348 i_char->init_req(2, AddI(i_char, intcon(2))); 4349 4350 set_control(IfFalse(iff)); 4351 set_memory(st, TypeAryPtr::BYTES); 4352 } 4353 4354 Node* GraphKit::make_constant_from_field(ciField* field, Node* obj) { 4355 if (!field->is_constant()) { 4356 return NULL; // Field not marked as constant. 4357 } 4358 ciInstance* holder = NULL; 4359 if (!field->is_static()) { 4360 ciObject* const_oop = obj->bottom_type()->is_oopptr()->const_oop(); 4361 if (const_oop != NULL && const_oop->is_instance()) { 4362 holder = const_oop->as_instance(); 4363 } 4364 } 4365 const Type* con_type = Type::make_constant_from_field(field, holder, field->layout_type(), 4366 /*is_unsigned_load=*/false); 4367 if (con_type != NULL) { 4368 Node* con = makecon(con_type); 4369 if (field->layout_type() == T_VALUETYPE) { 4370 // Load value type from constant oop 4371 con = ValueTypeNode::make_from_oop(this, con, field->type()->as_value_klass()); 4372 } 4373 return con; 4374 } 4375 return NULL; 4376 } 4377 4378 Node* GraphKit::cast_array_to_stable(Node* ary, const TypeAryPtr* ary_type) { 4379 // Reify the property as a CastPP node in Ideal graph to comply with monotonicity 4380 // assumption of CCP analysis. 4381 return _gvn.transform(new CastPPNode(ary, ary_type->cast_to_stable(true))); 4382 } 4383 4384 //---------------------------load_mirror_from_klass---------------------------- 4385 // Given a klass oop, load its java mirror (a java.lang.Class oop). 4386 Node* GraphKit::load_mirror_from_klass(Node* klass) { 4387 Node* p = basic_plus_adr(klass, in_bytes(Klass::java_mirror_offset())); 4388 Node* load = make_load(NULL, p, TypeRawPtr::NOTNULL, T_ADDRESS, MemNode::unordered); 4389 // mirror = ((OopHandle)mirror)->resolve(); 4390 return access_load(load, TypeInstPtr::MIRROR, T_OBJECT, IN_NATIVE); 4391 }