1 /* 2 * Copyright (c) 2001, 2012, 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 "compiler/compileLog.hpp" 27 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 28 #include "gc_implementation/g1/heapRegion.hpp" 29 #include "gc_interface/collectedHeap.hpp" 30 #include "memory/barrierSet.hpp" 31 #include "memory/cardTableModRefBS.hpp" 32 #include "opto/addnode.hpp" 33 #include "opto/graphKit.hpp" 34 #include "opto/idealKit.hpp" 35 #include "opto/locknode.hpp" 36 #include "opto/machnode.hpp" 37 #include "opto/parse.hpp" 38 #include "opto/rootnode.hpp" 39 #include "opto/runtime.hpp" 40 #include "runtime/deoptimization.hpp" 41 #include "runtime/sharedRuntime.hpp" 42 43 //----------------------------GraphKit----------------------------------------- 44 // Main utility constructor. 45 GraphKit::GraphKit(JVMState* jvms) 46 : Phase(Phase::Parser), 47 _env(C->env()), 48 _gvn(*C->initial_gvn()) 49 { 50 _exceptions = jvms->map()->next_exception(); 51 if (_exceptions != NULL) jvms->map()->set_next_exception(NULL); 52 set_jvms(jvms); 53 } 54 55 // Private constructor for parser. 56 GraphKit::GraphKit() 57 : Phase(Phase::Parser), 58 _env(C->env()), 59 _gvn(*C->initial_gvn()) 60 { 61 _exceptions = NULL; 62 set_map(NULL); 63 debug_only(_sp = -99); 64 debug_only(set_bci(-99)); 65 } 66 67 68 69 //---------------------------clean_stack--------------------------------------- 70 // Clear away rubbish from the stack area of the JVM state. 71 // This destroys any arguments that may be waiting on the stack. 72 void GraphKit::clean_stack(int from_sp) { 73 SafePointNode* map = this->map(); 74 JVMState* jvms = this->jvms(); 75 int stk_size = jvms->stk_size(); 76 int stkoff = jvms->stkoff(); 77 Node* top = this->top(); 78 for (int i = from_sp; i < stk_size; i++) { 79 if (map->in(stkoff + i) != top) { 80 map->set_req(stkoff + i, top); 81 } 82 } 83 } 84 85 86 //--------------------------------sync_jvms----------------------------------- 87 // Make sure our current jvms agrees with our parse state. 88 JVMState* GraphKit::sync_jvms() const { 89 JVMState* jvms = this->jvms(); 90 jvms->set_bci(bci()); // Record the new bci in the JVMState 91 jvms->set_sp(sp()); // Record the new sp in the JVMState 92 assert(jvms_in_sync(), "jvms is now in sync"); 93 return jvms; 94 } 95 96 //--------------------------------sync_jvms_for_reexecute--------------------- 97 // Make sure our current jvms agrees with our parse state. This version 98 // uses the reexecute_sp for reexecuting bytecodes. 99 JVMState* GraphKit::sync_jvms_for_reexecute() { 100 JVMState* jvms = this->jvms(); 101 jvms->set_bci(bci()); // Record the new bci in the JVMState 102 jvms->set_sp(reexecute_sp()); // Record the new sp in the JVMState 103 return jvms; 104 } 105 106 #ifdef ASSERT 107 bool GraphKit::jvms_in_sync() const { 108 Parse* parse = is_Parse(); 109 if (parse == NULL) { 110 if (bci() != jvms()->bci()) return false; 111 if (sp() != (int)jvms()->sp()) return false; 112 return true; 113 } 114 if (jvms()->method() != parse->method()) return false; 115 if (jvms()->bci() != parse->bci()) return false; 116 int jvms_sp = jvms()->sp(); 117 if (jvms_sp != parse->sp()) return false; 118 int jvms_depth = jvms()->depth(); 119 if (jvms_depth != parse->depth()) return false; 120 return true; 121 } 122 123 // Local helper checks for special internal merge points 124 // used to accumulate and merge exception states. 125 // They are marked by the region's in(0) edge being the map itself. 126 // Such merge points must never "escape" into the parser at large, 127 // until they have been handed to gvn.transform. 128 static bool is_hidden_merge(Node* reg) { 129 if (reg == NULL) return false; 130 if (reg->is_Phi()) { 131 reg = reg->in(0); 132 if (reg == NULL) return false; 133 } 134 return reg->is_Region() && reg->in(0) != NULL && reg->in(0)->is_Root(); 135 } 136 137 void GraphKit::verify_map() const { 138 if (map() == NULL) return; // null map is OK 139 assert(map()->req() <= jvms()->endoff(), "no extra garbage on map"); 140 assert(!map()->has_exceptions(), "call add_exception_states_from 1st"); 141 assert(!is_hidden_merge(control()), "call use_exception_state, not set_map"); 142 } 143 144 void GraphKit::verify_exception_state(SafePointNode* ex_map) { 145 assert(ex_map->next_exception() == NULL, "not already part of a chain"); 146 assert(has_saved_ex_oop(ex_map), "every exception state has an ex_oop"); 147 } 148 #endif 149 150 //---------------------------stop_and_kill_map--------------------------------- 151 // Set _map to NULL, signalling a stop to further bytecode execution. 152 // First smash the current map's control to a constant, to mark it dead. 153 void GraphKit::stop_and_kill_map() { 154 SafePointNode* dead_map = stop(); 155 if (dead_map != NULL) { 156 dead_map->disconnect_inputs(NULL, C); // Mark the map as killed. 157 assert(dead_map->is_killed(), "must be so marked"); 158 } 159 } 160 161 162 //--------------------------------stopped-------------------------------------- 163 // Tell if _map is NULL, or control is top. 164 bool GraphKit::stopped() { 165 if (map() == NULL) return true; 166 else if (control() == top()) return true; 167 else return false; 168 } 169 170 171 //-----------------------------has_ex_handler---------------------------------- 172 // Tell if this method or any caller method has exception handlers. 173 bool GraphKit::has_ex_handler() { 174 for (JVMState* jvmsp = jvms(); jvmsp != NULL; jvmsp = jvmsp->caller()) { 175 if (jvmsp->has_method() && jvmsp->method()->has_exception_handlers()) { 176 return true; 177 } 178 } 179 return false; 180 } 181 182 //------------------------------save_ex_oop------------------------------------ 183 // Save an exception without blowing stack contents or other JVM state. 184 void GraphKit::set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop) { 185 assert(!has_saved_ex_oop(ex_map), "clear ex-oop before setting again"); 186 ex_map->add_req(ex_oop); 187 debug_only(verify_exception_state(ex_map)); 188 } 189 190 inline static Node* common_saved_ex_oop(SafePointNode* ex_map, bool clear_it) { 191 assert(GraphKit::has_saved_ex_oop(ex_map), "ex_oop must be there"); 192 Node* ex_oop = ex_map->in(ex_map->req()-1); 193 if (clear_it) ex_map->del_req(ex_map->req()-1); 194 return ex_oop; 195 } 196 197 //-----------------------------saved_ex_oop------------------------------------ 198 // Recover a saved exception from its map. 199 Node* GraphKit::saved_ex_oop(SafePointNode* ex_map) { 200 return common_saved_ex_oop(ex_map, false); 201 } 202 203 //--------------------------clear_saved_ex_oop--------------------------------- 204 // Erase a previously saved exception from its map. 205 Node* GraphKit::clear_saved_ex_oop(SafePointNode* ex_map) { 206 return common_saved_ex_oop(ex_map, true); 207 } 208 209 #ifdef ASSERT 210 //---------------------------has_saved_ex_oop---------------------------------- 211 // Erase a previously saved exception from its map. 212 bool GraphKit::has_saved_ex_oop(SafePointNode* ex_map) { 213 return ex_map->req() == ex_map->jvms()->endoff()+1; 214 } 215 #endif 216 217 //-------------------------make_exception_state-------------------------------- 218 // Turn the current JVM state into an exception state, appending the ex_oop. 219 SafePointNode* GraphKit::make_exception_state(Node* ex_oop) { 220 sync_jvms(); 221 SafePointNode* ex_map = stop(); // do not manipulate this map any more 222 set_saved_ex_oop(ex_map, ex_oop); 223 return ex_map; 224 } 225 226 227 //--------------------------add_exception_state-------------------------------- 228 // Add an exception to my list of exceptions. 229 void GraphKit::add_exception_state(SafePointNode* ex_map) { 230 if (ex_map == NULL || ex_map->control() == top()) { 231 return; 232 } 233 #ifdef ASSERT 234 verify_exception_state(ex_map); 235 if (has_exceptions()) { 236 assert(ex_map->jvms()->same_calls_as(_exceptions->jvms()), "all collected exceptions must come from the same place"); 237 } 238 #endif 239 240 // If there is already an exception of exactly this type, merge with it. 241 // In particular, null-checks and other low-level exceptions common up here. 242 Node* ex_oop = saved_ex_oop(ex_map); 243 const Type* ex_type = _gvn.type(ex_oop); 244 if (ex_oop == top()) { 245 // No action needed. 246 return; 247 } 248 assert(ex_type->isa_instptr(), "exception must be an instance"); 249 for (SafePointNode* e2 = _exceptions; e2 != NULL; e2 = e2->next_exception()) { 250 const Type* ex_type2 = _gvn.type(saved_ex_oop(e2)); 251 // We check sp also because call bytecodes can generate exceptions 252 // both before and after arguments are popped! 253 if (ex_type2 == ex_type 254 && e2->_jvms->sp() == ex_map->_jvms->sp()) { 255 combine_exception_states(ex_map, e2); 256 return; 257 } 258 } 259 260 // No pre-existing exception of the same type. Chain it on the list. 261 push_exception_state(ex_map); 262 } 263 264 //-----------------------add_exception_states_from----------------------------- 265 void GraphKit::add_exception_states_from(JVMState* jvms) { 266 SafePointNode* ex_map = jvms->map()->next_exception(); 267 if (ex_map != NULL) { 268 jvms->map()->set_next_exception(NULL); 269 for (SafePointNode* next_map; ex_map != NULL; ex_map = next_map) { 270 next_map = ex_map->next_exception(); 271 ex_map->set_next_exception(NULL); 272 add_exception_state(ex_map); 273 } 274 } 275 } 276 277 //-----------------------transfer_exceptions_into_jvms------------------------- 278 JVMState* GraphKit::transfer_exceptions_into_jvms() { 279 if (map() == NULL) { 280 // We need a JVMS to carry the exceptions, but the map has gone away. 281 // Create a scratch JVMS, cloned from any of the exception states... 282 if (has_exceptions()) { 283 _map = _exceptions; 284 _map = clone_map(); 285 _map->set_next_exception(NULL); 286 clear_saved_ex_oop(_map); 287 debug_only(verify_map()); 288 } else { 289 // ...or created from scratch 290 JVMState* jvms = new (C) JVMState(_method, NULL); 291 jvms->set_bci(_bci); 292 jvms->set_sp(_sp); 293 jvms->set_map(new (C) SafePointNode(TypeFunc::Parms, jvms)); 294 set_jvms(jvms); 295 for (uint i = 0; i < map()->req(); i++) map()->init_req(i, top()); 296 set_all_memory(top()); 297 while (map()->req() < jvms->endoff()) map()->add_req(top()); 298 } 299 // (This is a kludge, in case you didn't notice.) 300 set_control(top()); 301 } 302 JVMState* jvms = sync_jvms(); 303 assert(!jvms->map()->has_exceptions(), "no exceptions on this map yet"); 304 jvms->map()->set_next_exception(_exceptions); 305 _exceptions = NULL; // done with this set of exceptions 306 return jvms; 307 } 308 309 static inline void add_n_reqs(Node* dstphi, Node* srcphi) { 310 assert(is_hidden_merge(dstphi), "must be a special merge node"); 311 assert(is_hidden_merge(srcphi), "must be a special merge node"); 312 uint limit = srcphi->req(); 313 for (uint i = PhiNode::Input; i < limit; i++) { 314 dstphi->add_req(srcphi->in(i)); 315 } 316 } 317 static inline void add_one_req(Node* dstphi, Node* src) { 318 assert(is_hidden_merge(dstphi), "must be a special merge node"); 319 assert(!is_hidden_merge(src), "must not be a special merge node"); 320 dstphi->add_req(src); 321 } 322 323 //-----------------------combine_exception_states------------------------------ 324 // This helper function combines exception states by building phis on a 325 // specially marked state-merging region. These regions and phis are 326 // untransformed, and can build up gradually. The region is marked by 327 // having a control input of its exception map, rather than NULL. Such 328 // regions do not appear except in this function, and in use_exception_state. 329 void GraphKit::combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map) { 330 if (failing()) return; // dying anyway... 331 JVMState* ex_jvms = ex_map->_jvms; 332 assert(ex_jvms->same_calls_as(phi_map->_jvms), "consistent call chains"); 333 assert(ex_jvms->stkoff() == phi_map->_jvms->stkoff(), "matching locals"); 334 assert(ex_jvms->sp() == phi_map->_jvms->sp(), "matching stack sizes"); 335 assert(ex_jvms->monoff() == phi_map->_jvms->monoff(), "matching JVMS"); 336 assert(ex_map->req() == phi_map->req(), "matching maps"); 337 uint tos = ex_jvms->stkoff() + ex_jvms->sp(); 338 Node* hidden_merge_mark = root(); 339 Node* region = phi_map->control(); 340 MergeMemNode* phi_mem = phi_map->merged_memory(); 341 MergeMemNode* ex_mem = ex_map->merged_memory(); 342 if (region->in(0) != hidden_merge_mark) { 343 // The control input is not (yet) a specially-marked region in phi_map. 344 // Make it so, and build some phis. 345 region = new (C) RegionNode(2); 346 _gvn.set_type(region, Type::CONTROL); 347 region->set_req(0, hidden_merge_mark); // marks an internal ex-state 348 region->init_req(1, phi_map->control()); 349 phi_map->set_control(region); 350 Node* io_phi = PhiNode::make(region, phi_map->i_o(), Type::ABIO); 351 record_for_igvn(io_phi); 352 _gvn.set_type(io_phi, Type::ABIO); 353 phi_map->set_i_o(io_phi); 354 for (MergeMemStream mms(phi_mem); mms.next_non_empty(); ) { 355 Node* m = mms.memory(); 356 Node* m_phi = PhiNode::make(region, m, Type::MEMORY, mms.adr_type(C)); 357 record_for_igvn(m_phi); 358 _gvn.set_type(m_phi, Type::MEMORY); 359 mms.set_memory(m_phi); 360 } 361 } 362 363 // Either or both of phi_map and ex_map might already be converted into phis. 364 Node* ex_control = ex_map->control(); 365 // if there is special marking on ex_map also, we add multiple edges from src 366 bool add_multiple = (ex_control->in(0) == hidden_merge_mark); 367 // how wide was the destination phi_map, originally? 368 uint orig_width = region->req(); 369 370 if (add_multiple) { 371 add_n_reqs(region, ex_control); 372 add_n_reqs(phi_map->i_o(), ex_map->i_o()); 373 } else { 374 // ex_map has no merges, so we just add single edges everywhere 375 add_one_req(region, ex_control); 376 add_one_req(phi_map->i_o(), ex_map->i_o()); 377 } 378 for (MergeMemStream mms(phi_mem, ex_mem); mms.next_non_empty2(); ) { 379 if (mms.is_empty()) { 380 // get a copy of the base memory, and patch some inputs into it 381 const TypePtr* adr_type = mms.adr_type(C); 382 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type); 383 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), ""); 384 mms.set_memory(phi); 385 // Prepare to append interesting stuff onto the newly sliced phi: 386 while (phi->req() > orig_width) phi->del_req(phi->req()-1); 387 } 388 // Append stuff from ex_map: 389 if (add_multiple) { 390 add_n_reqs(mms.memory(), mms.memory2()); 391 } else { 392 add_one_req(mms.memory(), mms.memory2()); 393 } 394 } 395 uint limit = ex_map->req(); 396 for (uint i = TypeFunc::Parms; i < limit; i++) { 397 // Skip everything in the JVMS after tos. (The ex_oop follows.) 398 if (i == tos) i = ex_jvms->monoff(); 399 Node* src = ex_map->in(i); 400 Node* dst = phi_map->in(i); 401 if (src != dst) { 402 PhiNode* phi; 403 if (dst->in(0) != region) { 404 dst = phi = PhiNode::make(region, dst, _gvn.type(dst)); 405 record_for_igvn(phi); 406 _gvn.set_type(phi, phi->type()); 407 phi_map->set_req(i, dst); 408 // Prepare to append interesting stuff onto the new phi: 409 while (dst->req() > orig_width) dst->del_req(dst->req()-1); 410 } else { 411 assert(dst->is_Phi(), "nobody else uses a hidden region"); 412 phi = (PhiNode*)dst; 413 } 414 if (add_multiple && src->in(0) == ex_control) { 415 // Both are phis. 416 add_n_reqs(dst, src); 417 } else { 418 while (dst->req() < region->req()) add_one_req(dst, src); 419 } 420 const Type* srctype = _gvn.type(src); 421 if (phi->type() != srctype) { 422 const Type* dsttype = phi->type()->meet(srctype); 423 if (phi->type() != dsttype) { 424 phi->set_type(dsttype); 425 _gvn.set_type(phi, dsttype); 426 } 427 } 428 } 429 } 430 } 431 432 //--------------------------use_exception_state-------------------------------- 433 Node* GraphKit::use_exception_state(SafePointNode* phi_map) { 434 if (failing()) { stop(); return top(); } 435 Node* region = phi_map->control(); 436 Node* hidden_merge_mark = root(); 437 assert(phi_map->jvms()->map() == phi_map, "sanity: 1-1 relation"); 438 Node* ex_oop = clear_saved_ex_oop(phi_map); 439 if (region->in(0) == hidden_merge_mark) { 440 // Special marking for internal ex-states. Process the phis now. 441 region->set_req(0, region); // now it's an ordinary region 442 set_jvms(phi_map->jvms()); // ...so now we can use it as a map 443 // Note: Setting the jvms also sets the bci and sp. 444 set_control(_gvn.transform(region)); 445 uint tos = jvms()->stkoff() + sp(); 446 for (uint i = 1; i < tos; i++) { 447 Node* x = phi_map->in(i); 448 if (x->in(0) == region) { 449 assert(x->is_Phi(), "expected a special phi"); 450 phi_map->set_req(i, _gvn.transform(x)); 451 } 452 } 453 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) { 454 Node* x = mms.memory(); 455 if (x->in(0) == region) { 456 assert(x->is_Phi(), "nobody else uses a hidden region"); 457 mms.set_memory(_gvn.transform(x)); 458 } 459 } 460 if (ex_oop->in(0) == region) { 461 assert(ex_oop->is_Phi(), "expected a special phi"); 462 ex_oop = _gvn.transform(ex_oop); 463 } 464 } else { 465 set_jvms(phi_map->jvms()); 466 } 467 468 assert(!is_hidden_merge(phi_map->control()), "hidden ex. states cleared"); 469 assert(!is_hidden_merge(phi_map->i_o()), "hidden ex. states cleared"); 470 return ex_oop; 471 } 472 473 //---------------------------------java_bc------------------------------------- 474 Bytecodes::Code GraphKit::java_bc() const { 475 ciMethod* method = this->method(); 476 int bci = this->bci(); 477 if (method != NULL && bci != InvocationEntryBci) 478 return method->java_code_at_bci(bci); 479 else 480 return Bytecodes::_illegal; 481 } 482 483 void GraphKit::uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, 484 bool must_throw) { 485 // if the exception capability is set, then we will generate code 486 // to check the JavaThread.should_post_on_exceptions flag to see 487 // if we actually need to report exception events (for this 488 // thread). If we don't need to report exception events, we will 489 // take the normal fast path provided by add_exception_events. If 490 // exception event reporting is enabled for this thread, we will 491 // take the uncommon_trap in the BuildCutout below. 492 493 // first must access the should_post_on_exceptions_flag in this thread's JavaThread 494 Node* jthread = _gvn.transform(new (C) ThreadLocalNode()); 495 Node* adr = basic_plus_adr(top(), jthread, in_bytes(JavaThread::should_post_on_exceptions_flag_offset())); 496 Node* should_post_flag = make_load(control(), adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw, false); 497 498 // Test the should_post_on_exceptions_flag vs. 0 499 Node* chk = _gvn.transform( new (C) CmpINode(should_post_flag, intcon(0)) ); 500 Node* tst = _gvn.transform( new (C) BoolNode(chk, BoolTest::eq) ); 501 502 // Branch to slow_path if should_post_on_exceptions_flag was true 503 { BuildCutout unless(this, tst, PROB_MAX); 504 // Do not try anything fancy if we're notifying the VM on every throw. 505 // Cf. case Bytecodes::_athrow in parse2.cpp. 506 uncommon_trap(reason, Deoptimization::Action_none, 507 (ciKlass*)NULL, (char*)NULL, must_throw); 508 } 509 510 } 511 512 //------------------------------builtin_throw---------------------------------- 513 void GraphKit::builtin_throw(Deoptimization::DeoptReason reason, Node* arg) { 514 bool must_throw = true; 515 516 if (env()->jvmti_can_post_on_exceptions()) { 517 // check if we must post exception events, take uncommon trap if so 518 uncommon_trap_if_should_post_on_exceptions(reason, must_throw); 519 // here if should_post_on_exceptions is false 520 // continue on with the normal codegen 521 } 522 523 // If this particular condition has not yet happened at this 524 // bytecode, then use the uncommon trap mechanism, and allow for 525 // a future recompilation if several traps occur here. 526 // If the throw is hot, try to use a more complicated inline mechanism 527 // which keeps execution inside the compiled code. 528 bool treat_throw_as_hot = false; 529 ciMethodData* md = method()->method_data(); 530 531 if (ProfileTraps) { 532 if (too_many_traps(reason)) { 533 treat_throw_as_hot = true; 534 } 535 // (If there is no MDO at all, assume it is early in 536 // execution, and that any deopts are part of the 537 // startup transient, and don't need to be remembered.) 538 539 // Also, if there is a local exception handler, treat all throws 540 // as hot if there has been at least one in this method. 541 if (C->trap_count(reason) != 0 542 && method()->method_data()->trap_count(reason) != 0 543 && has_ex_handler()) { 544 treat_throw_as_hot = true; 545 } 546 } 547 548 // If this throw happens frequently, an uncommon trap might cause 549 // a performance pothole. If there is a local exception handler, 550 // and if this particular bytecode appears to be deoptimizing often, 551 // let us handle the throw inline, with a preconstructed instance. 552 // Note: If the deopt count has blown up, the uncommon trap 553 // runtime is going to flush this nmethod, not matter what. 554 if (treat_throw_as_hot 555 && (!StackTraceInThrowable || OmitStackTraceInFastThrow)) { 556 // If the throw is local, we use a pre-existing instance and 557 // punt on the backtrace. This would lead to a missing backtrace 558 // (a repeat of 4292742) if the backtrace object is ever asked 559 // for its backtrace. 560 // Fixing this remaining case of 4292742 requires some flavor of 561 // escape analysis. Leave that for the future. 562 ciInstance* ex_obj = NULL; 563 switch (reason) { 564 case Deoptimization::Reason_null_check: 565 ex_obj = env()->NullPointerException_instance(); 566 break; 567 case Deoptimization::Reason_div0_check: 568 ex_obj = env()->ArithmeticException_instance(); 569 break; 570 case Deoptimization::Reason_range_check: 571 ex_obj = env()->ArrayIndexOutOfBoundsException_instance(); 572 break; 573 case Deoptimization::Reason_class_check: 574 if (java_bc() == Bytecodes::_aastore) { 575 ex_obj = env()->ArrayStoreException_instance(); 576 } else { 577 ex_obj = env()->ClassCastException_instance(); 578 } 579 break; 580 } 581 if (failing()) { stop(); return; } // exception allocation might fail 582 if (ex_obj != NULL) { 583 // Cheat with a preallocated exception object. 584 if (C->log() != NULL) 585 C->log()->elem("hot_throw preallocated='1' reason='%s'", 586 Deoptimization::trap_reason_name(reason)); 587 const TypeInstPtr* ex_con = TypeInstPtr::make(ex_obj); 588 Node* ex_node = _gvn.transform( ConNode::make(C, ex_con) ); 589 590 // Clear the detail message of the preallocated exception object. 591 // Weblogic sometimes mutates the detail message of exceptions 592 // using reflection. 593 int offset = java_lang_Throwable::get_detailMessage_offset(); 594 const TypePtr* adr_typ = ex_con->add_offset(offset); 595 596 Node *adr = basic_plus_adr(ex_node, ex_node, offset); 597 const TypeOopPtr* val_type = TypeOopPtr::make_from_klass(env()->String_klass()); 598 Node *store = store_oop_to_object(control(), ex_node, adr, adr_typ, null(), val_type, T_OBJECT); 599 600 add_exception_state(make_exception_state(ex_node)); 601 return; 602 } 603 } 604 605 // %%% Maybe add entry to OptoRuntime which directly throws the exc.? 606 // It won't be much cheaper than bailing to the interp., since we'll 607 // have to pass up all the debug-info, and the runtime will have to 608 // create the stack trace. 609 610 // Usual case: Bail to interpreter. 611 // Reserve the right to recompile if we haven't seen anything yet. 612 613 Deoptimization::DeoptAction action = Deoptimization::Action_maybe_recompile; 614 if (treat_throw_as_hot 615 && (method()->method_data()->trap_recompiled_at(bci()) 616 || C->too_many_traps(reason))) { 617 // We cannot afford to take more traps here. Suffer in the interpreter. 618 if (C->log() != NULL) 619 C->log()->elem("hot_throw preallocated='0' reason='%s' mcount='%d'", 620 Deoptimization::trap_reason_name(reason), 621 C->trap_count(reason)); 622 action = Deoptimization::Action_none; 623 } 624 625 // "must_throw" prunes the JVM state to include only the stack, if there 626 // are no local exception handlers. This should cut down on register 627 // allocation time and code size, by drastically reducing the number 628 // of in-edges on the call to the uncommon trap. 629 630 uncommon_trap(reason, action, (ciKlass*)NULL, (char*)NULL, must_throw); 631 } 632 633 634 //----------------------------PreserveJVMState--------------------------------- 635 PreserveJVMState::PreserveJVMState(GraphKit* kit, bool clone_map) { 636 debug_only(kit->verify_map()); 637 _kit = kit; 638 _map = kit->map(); // preserve the map 639 _sp = kit->sp(); 640 kit->set_map(clone_map ? kit->clone_map() : NULL); 641 #ifdef ASSERT 642 _bci = kit->bci(); 643 Parse* parser = kit->is_Parse(); 644 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); 645 _block = block; 646 #endif 647 } 648 PreserveJVMState::~PreserveJVMState() { 649 GraphKit* kit = _kit; 650 #ifdef ASSERT 651 assert(kit->bci() == _bci, "bci must not shift"); 652 Parse* parser = kit->is_Parse(); 653 int block = (parser == NULL || parser->block() == NULL) ? -1 : parser->block()->rpo(); 654 assert(block == _block, "block must not shift"); 655 #endif 656 kit->set_map(_map); 657 kit->set_sp(_sp); 658 } 659 660 661 //-----------------------------BuildCutout------------------------------------- 662 BuildCutout::BuildCutout(GraphKit* kit, Node* p, float prob, float cnt) 663 : PreserveJVMState(kit) 664 { 665 assert(p->is_Con() || p->is_Bool(), "test must be a bool"); 666 SafePointNode* outer_map = _map; // preserved map is caller's 667 SafePointNode* inner_map = kit->map(); 668 IfNode* iff = kit->create_and_map_if(outer_map->control(), p, prob, cnt); 669 outer_map->set_control(kit->gvn().transform( new (kit->C) IfTrueNode(iff) )); 670 inner_map->set_control(kit->gvn().transform( new (kit->C) IfFalseNode(iff) )); 671 } 672 BuildCutout::~BuildCutout() { 673 GraphKit* kit = _kit; 674 assert(kit->stopped(), "cutout code must stop, throw, return, etc."); 675 } 676 677 //---------------------------PreserveReexecuteState---------------------------- 678 PreserveReexecuteState::PreserveReexecuteState(GraphKit* kit) { 679 assert(!kit->stopped(), "must call stopped() before"); 680 _kit = kit; 681 _sp = kit->sp(); 682 _reexecute = kit->jvms()->_reexecute; 683 } 684 PreserveReexecuteState::~PreserveReexecuteState() { 685 if (_kit->stopped()) return; 686 _kit->jvms()->_reexecute = _reexecute; 687 _kit->set_sp(_sp); 688 } 689 690 //------------------------------clone_map-------------------------------------- 691 // Implementation of PreserveJVMState 692 // 693 // Only clone_map(...) here. If this function is only used in the 694 // PreserveJVMState class we may want to get rid of this extra 695 // function eventually and do it all there. 696 697 SafePointNode* GraphKit::clone_map() { 698 if (map() == NULL) return NULL; 699 700 // Clone the memory edge first 701 Node* mem = MergeMemNode::make(C, map()->memory()); 702 gvn().set_type_bottom(mem); 703 704 SafePointNode *clonemap = (SafePointNode*)map()->clone(); 705 JVMState* jvms = this->jvms(); 706 JVMState* clonejvms = jvms->clone_shallow(C); 707 clonemap->set_memory(mem); 708 clonemap->set_jvms(clonejvms); 709 clonejvms->set_map(clonemap); 710 record_for_igvn(clonemap); 711 gvn().set_type_bottom(clonemap); 712 return clonemap; 713 } 714 715 716 //-----------------------------set_map_clone----------------------------------- 717 void GraphKit::set_map_clone(SafePointNode* m) { 718 _map = m; 719 _map = clone_map(); 720 _map->set_next_exception(NULL); 721 debug_only(verify_map()); 722 } 723 724 725 //----------------------------kill_dead_locals--------------------------------- 726 // Detect any locals which are known to be dead, and force them to top. 727 void GraphKit::kill_dead_locals() { 728 // Consult the liveness information for the locals. If any 729 // of them are unused, then they can be replaced by top(). This 730 // should help register allocation time and cut down on the size 731 // of the deoptimization information. 732 733 // This call is made from many of the bytecode handling 734 // subroutines called from the Big Switch in do_one_bytecode. 735 // Every bytecode which might include a slow path is responsible 736 // for killing its dead locals. The more consistent we 737 // are about killing deads, the fewer useless phis will be 738 // constructed for them at various merge points. 739 740 // bci can be -1 (InvocationEntryBci). We return the entry 741 // liveness for the method. 742 743 if (method() == NULL || method()->code_size() == 0) { 744 // We are building a graph for a call to a native method. 745 // All locals are live. 746 return; 747 } 748 749 ResourceMark rm; 750 751 // Consult the liveness information for the locals. If any 752 // of them are unused, then they can be replaced by top(). This 753 // should help register allocation time and cut down on the size 754 // of the deoptimization information. 755 MethodLivenessResult live_locals = method()->liveness_at_bci(bci()); 756 757 int len = (int)live_locals.size(); 758 assert(len <= jvms()->loc_size(), "too many live locals"); 759 for (int local = 0; local < len; local++) { 760 if (!live_locals.at(local)) { 761 set_local(local, top()); 762 } 763 } 764 } 765 766 #ifdef ASSERT 767 //-------------------------dead_locals_are_killed------------------------------ 768 // Return true if all dead locals are set to top in the map. 769 // Used to assert "clean" debug info at various points. 770 bool GraphKit::dead_locals_are_killed() { 771 if (method() == NULL || method()->code_size() == 0) { 772 // No locals need to be dead, so all is as it should be. 773 return true; 774 } 775 776 // Make sure somebody called kill_dead_locals upstream. 777 ResourceMark rm; 778 for (JVMState* jvms = this->jvms(); jvms != NULL; jvms = jvms->caller()) { 779 if (jvms->loc_size() == 0) continue; // no locals to consult 780 SafePointNode* map = jvms->map(); 781 ciMethod* method = jvms->method(); 782 int bci = jvms->bci(); 783 if (jvms == this->jvms()) { 784 bci = this->bci(); // it might not yet be synched 785 } 786 MethodLivenessResult live_locals = method->liveness_at_bci(bci); 787 int len = (int)live_locals.size(); 788 if (!live_locals.is_valid() || len == 0) 789 // This method is trivial, or is poisoned by a breakpoint. 790 return true; 791 assert(len == jvms->loc_size(), "live map consistent with locals map"); 792 for (int local = 0; local < len; local++) { 793 if (!live_locals.at(local) && map->local(jvms, local) != top()) { 794 if (PrintMiscellaneous && (Verbose || WizardMode)) { 795 tty->print_cr("Zombie local %d: ", local); 796 jvms->dump(); 797 } 798 return false; 799 } 800 } 801 } 802 return true; 803 } 804 805 #endif //ASSERT 806 807 // Helper function for enforcing certain bytecodes to reexecute if 808 // deoptimization happens 809 static bool should_reexecute_implied_by_bytecode(JVMState *jvms, bool is_anewarray) { 810 ciMethod* cur_method = jvms->method(); 811 int cur_bci = jvms->bci(); 812 if (cur_method != NULL && cur_bci != InvocationEntryBci) { 813 Bytecodes::Code code = cur_method->java_code_at_bci(cur_bci); 814 return Interpreter::bytecode_should_reexecute(code) || 815 is_anewarray && code == Bytecodes::_multianewarray; 816 // Reexecute _multianewarray bytecode which was replaced with 817 // sequence of [a]newarray. See Parse::do_multianewarray(). 818 // 819 // Note: interpreter should not have it set since this optimization 820 // is limited by dimensions and guarded by flag so in some cases 821 // multianewarray() runtime calls will be generated and 822 // the bytecode should not be reexecutes (stack will not be reset). 823 } else 824 return false; 825 } 826 827 // Helper function for adding JVMState and debug information to node 828 void GraphKit::add_safepoint_edges(SafePointNode* call, bool must_throw) { 829 // Add the safepoint edges to the call (or other safepoint). 830 831 // Make sure dead locals are set to top. This 832 // should help register allocation time and cut down on the size 833 // of the deoptimization information. 834 assert(dead_locals_are_killed(), "garbage in debug info before safepoint"); 835 836 // Walk the inline list to fill in the correct set of JVMState's 837 // Also fill in the associated edges for each JVMState. 838 839 // If the bytecode needs to be reexecuted we need to put 840 // the arguments back on the stack. 841 const bool should_reexecute = jvms()->should_reexecute(); 842 JVMState* youngest_jvms = should_reexecute ? sync_jvms_for_reexecute() : sync_jvms(); 843 844 // NOTE: set_bci (called from sync_jvms) might reset the reexecute bit to 845 // undefined if the bci is different. This is normal for Parse but it 846 // should not happen for LibraryCallKit because only one bci is processed. 847 assert(!is_LibraryCallKit() || (jvms()->should_reexecute() == should_reexecute), 848 "in LibraryCallKit the reexecute bit should not change"); 849 850 // If we are guaranteed to throw, we can prune everything but the 851 // input to the current bytecode. 852 bool can_prune_locals = false; 853 uint stack_slots_not_pruned = 0; 854 int inputs = 0, depth = 0; 855 if (must_throw) { 856 assert(method() == youngest_jvms->method(), "sanity"); 857 if (compute_stack_effects(inputs, depth)) { 858 can_prune_locals = true; 859 stack_slots_not_pruned = inputs; 860 } 861 } 862 863 if (env()->jvmti_can_access_local_variables()) { 864 // At any safepoint, this method can get breakpointed, which would 865 // then require an immediate deoptimization. 866 can_prune_locals = false; // do not prune locals 867 stack_slots_not_pruned = 0; 868 } 869 870 // do not scribble on the input jvms 871 JVMState* out_jvms = youngest_jvms->clone_deep(C); 872 call->set_jvms(out_jvms); // Start jvms list for call node 873 874 // For a known set of bytecodes, the interpreter should reexecute them if 875 // deoptimization happens. We set the reexecute state for them here 876 if (out_jvms->is_reexecute_undefined() && //don't change if already specified 877 should_reexecute_implied_by_bytecode(out_jvms, call->is_AllocateArray())) { 878 out_jvms->set_should_reexecute(true); //NOTE: youngest_jvms not changed 879 } 880 881 // Presize the call: 882 DEBUG_ONLY(uint non_debug_edges = call->req()); 883 call->add_req_batch(top(), youngest_jvms->debug_depth()); 884 assert(call->req() == non_debug_edges + youngest_jvms->debug_depth(), ""); 885 886 // Set up edges so that the call looks like this: 887 // Call [state:] ctl io mem fptr retadr 888 // [parms:] parm0 ... parmN 889 // [root:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN 890 // [...mid:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN [...] 891 // [young:] loc0 ... locN stk0 ... stkSP mon0 obj0 ... monN objN 892 // Note that caller debug info precedes callee debug info. 893 894 // Fill pointer walks backwards from "young:" to "root:" in the diagram above: 895 uint debug_ptr = call->req(); 896 897 // Loop over the map input edges associated with jvms, add them 898 // to the call node, & reset all offsets to match call node array. 899 for (JVMState* in_jvms = youngest_jvms; in_jvms != NULL; ) { 900 uint debug_end = debug_ptr; 901 uint debug_start = debug_ptr - in_jvms->debug_size(); 902 debug_ptr = debug_start; // back up the ptr 903 904 uint p = debug_start; // walks forward in [debug_start, debug_end) 905 uint j, k, l; 906 SafePointNode* in_map = in_jvms->map(); 907 out_jvms->set_map(call); 908 909 if (can_prune_locals) { 910 assert(in_jvms->method() == out_jvms->method(), "sanity"); 911 // If the current throw can reach an exception handler in this JVMS, 912 // then we must keep everything live that can reach that handler. 913 // As a quick and dirty approximation, we look for any handlers at all. 914 if (in_jvms->method()->has_exception_handlers()) { 915 can_prune_locals = false; 916 } 917 } 918 919 // Add the Locals 920 k = in_jvms->locoff(); 921 l = in_jvms->loc_size(); 922 out_jvms->set_locoff(p); 923 if (!can_prune_locals) { 924 for (j = 0; j < l; j++) 925 call->set_req(p++, in_map->in(k+j)); 926 } else { 927 p += l; // already set to top above by add_req_batch 928 } 929 930 // Add the Expression Stack 931 k = in_jvms->stkoff(); 932 l = in_jvms->sp(); 933 out_jvms->set_stkoff(p); 934 if (!can_prune_locals) { 935 for (j = 0; j < l; j++) 936 call->set_req(p++, in_map->in(k+j)); 937 } else if (can_prune_locals && stack_slots_not_pruned != 0) { 938 // Divide stack into {S0,...,S1}, where S0 is set to top. 939 uint s1 = stack_slots_not_pruned; 940 stack_slots_not_pruned = 0; // for next iteration 941 if (s1 > l) s1 = l; 942 uint s0 = l - s1; 943 p += s0; // skip the tops preinstalled by add_req_batch 944 for (j = s0; j < l; j++) 945 call->set_req(p++, in_map->in(k+j)); 946 } else { 947 p += l; // already set to top above by add_req_batch 948 } 949 950 // Add the Monitors 951 k = in_jvms->monoff(); 952 l = in_jvms->mon_size(); 953 out_jvms->set_monoff(p); 954 for (j = 0; j < l; j++) 955 call->set_req(p++, in_map->in(k+j)); 956 957 // Copy any scalar object fields. 958 k = in_jvms->scloff(); 959 l = in_jvms->scl_size(); 960 out_jvms->set_scloff(p); 961 for (j = 0; j < l; j++) 962 call->set_req(p++, in_map->in(k+j)); 963 964 // Finish the new jvms. 965 out_jvms->set_endoff(p); 966 967 assert(out_jvms->endoff() == debug_end, "fill ptr must match"); 968 assert(out_jvms->depth() == in_jvms->depth(), "depth must match"); 969 assert(out_jvms->loc_size() == in_jvms->loc_size(), "size must match"); 970 assert(out_jvms->mon_size() == in_jvms->mon_size(), "size must match"); 971 assert(out_jvms->scl_size() == in_jvms->scl_size(), "size must match"); 972 assert(out_jvms->debug_size() == in_jvms->debug_size(), "size must match"); 973 974 // Update the two tail pointers in parallel. 975 out_jvms = out_jvms->caller(); 976 in_jvms = in_jvms->caller(); 977 } 978 979 assert(debug_ptr == non_debug_edges, "debug info must fit exactly"); 980 981 // Test the correctness of JVMState::debug_xxx accessors: 982 assert(call->jvms()->debug_start() == non_debug_edges, ""); 983 assert(call->jvms()->debug_end() == call->req(), ""); 984 assert(call->jvms()->debug_depth() == call->req() - non_debug_edges, ""); 985 } 986 987 bool GraphKit::compute_stack_effects(int& inputs, int& depth) { 988 Bytecodes::Code code = java_bc(); 989 if (code == Bytecodes::_wide) { 990 code = method()->java_code_at_bci(bci() + 1); 991 } 992 993 BasicType rtype = T_ILLEGAL; 994 int rsize = 0; 995 996 if (code != Bytecodes::_illegal) { 997 depth = Bytecodes::depth(code); // checkcast=0, athrow=-1 998 rtype = Bytecodes::result_type(code); // checkcast=P, athrow=V 999 if (rtype < T_CONFLICT) 1000 rsize = type2size[rtype]; 1001 } 1002 1003 switch (code) { 1004 case Bytecodes::_illegal: 1005 return false; 1006 1007 case Bytecodes::_ldc: 1008 case Bytecodes::_ldc_w: 1009 case Bytecodes::_ldc2_w: 1010 inputs = 0; 1011 break; 1012 1013 case Bytecodes::_dup: inputs = 1; break; 1014 case Bytecodes::_dup_x1: inputs = 2; break; 1015 case Bytecodes::_dup_x2: inputs = 3; break; 1016 case Bytecodes::_dup2: inputs = 2; break; 1017 case Bytecodes::_dup2_x1: inputs = 3; break; 1018 case Bytecodes::_dup2_x2: inputs = 4; break; 1019 case Bytecodes::_swap: inputs = 2; break; 1020 case Bytecodes::_arraylength: inputs = 1; break; 1021 1022 case Bytecodes::_getstatic: 1023 case Bytecodes::_putstatic: 1024 case Bytecodes::_getfield: 1025 case Bytecodes::_putfield: 1026 { 1027 bool ignored_will_link; 1028 ciField* field = method()->get_field_at_bci(bci(), ignored_will_link); 1029 int size = field->type()->size(); 1030 bool is_get = (depth >= 0), is_static = (depth & 1); 1031 inputs = (is_static ? 0 : 1); 1032 if (is_get) { 1033 depth = size - inputs; 1034 } else { 1035 inputs += size; // putxxx pops the value from the stack 1036 depth = - inputs; 1037 } 1038 } 1039 break; 1040 1041 case Bytecodes::_invokevirtual: 1042 case Bytecodes::_invokespecial: 1043 case Bytecodes::_invokestatic: 1044 case Bytecodes::_invokedynamic: 1045 case Bytecodes::_invokeinterface: 1046 { 1047 bool ignored_will_link; 1048 ciSignature* declared_signature = NULL; 1049 ciMethod* ignored_callee = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature); 1050 assert(declared_signature != NULL, "cannot be null"); 1051 inputs = declared_signature->arg_size_for_bc(code); 1052 int size = declared_signature->return_type()->size(); 1053 depth = size - inputs; 1054 } 1055 break; 1056 1057 case Bytecodes::_multianewarray: 1058 { 1059 ciBytecodeStream iter(method()); 1060 iter.reset_to_bci(bci()); 1061 iter.next(); 1062 inputs = iter.get_dimensions(); 1063 assert(rsize == 1, ""); 1064 depth = rsize - inputs; 1065 } 1066 break; 1067 1068 case Bytecodes::_ireturn: 1069 case Bytecodes::_lreturn: 1070 case Bytecodes::_freturn: 1071 case Bytecodes::_dreturn: 1072 case Bytecodes::_areturn: 1073 assert(rsize = -depth, ""); 1074 inputs = rsize; 1075 break; 1076 1077 case Bytecodes::_jsr: 1078 case Bytecodes::_jsr_w: 1079 inputs = 0; 1080 depth = 1; // S.B. depth=1, not zero 1081 break; 1082 1083 default: 1084 // bytecode produces a typed result 1085 inputs = rsize - depth; 1086 assert(inputs >= 0, ""); 1087 break; 1088 } 1089 1090 #ifdef ASSERT 1091 // spot check 1092 int outputs = depth + inputs; 1093 assert(outputs >= 0, "sanity"); 1094 switch (code) { 1095 case Bytecodes::_checkcast: assert(inputs == 1 && outputs == 1, ""); break; 1096 case Bytecodes::_athrow: assert(inputs == 1 && outputs == 0, ""); break; 1097 case Bytecodes::_aload_0: assert(inputs == 0 && outputs == 1, ""); break; 1098 case Bytecodes::_return: assert(inputs == 0 && outputs == 0, ""); break; 1099 case Bytecodes::_drem: assert(inputs == 4 && outputs == 2, ""); break; 1100 } 1101 #endif //ASSERT 1102 1103 return true; 1104 } 1105 1106 1107 1108 //------------------------------basic_plus_adr--------------------------------- 1109 Node* GraphKit::basic_plus_adr(Node* base, Node* ptr, Node* offset) { 1110 // short-circuit a common case 1111 if (offset == intcon(0)) return ptr; 1112 return _gvn.transform( new (C) AddPNode(base, ptr, offset) ); 1113 } 1114 1115 Node* GraphKit::ConvI2L(Node* offset) { 1116 // short-circuit a common case 1117 jint offset_con = find_int_con(offset, Type::OffsetBot); 1118 if (offset_con != Type::OffsetBot) { 1119 return longcon((jlong) offset_con); 1120 } 1121 return _gvn.transform( new (C) ConvI2LNode(offset)); 1122 } 1123 Node* GraphKit::ConvL2I(Node* offset) { 1124 // short-circuit a common case 1125 jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot); 1126 if (offset_con != (jlong)Type::OffsetBot) { 1127 return intcon((int) offset_con); 1128 } 1129 return _gvn.transform( new (C) ConvL2INode(offset)); 1130 } 1131 1132 //-------------------------load_object_klass----------------------------------- 1133 Node* GraphKit::load_object_klass(Node* obj) { 1134 // Special-case a fresh allocation to avoid building nodes: 1135 Node* akls = AllocateNode::Ideal_klass(obj, &_gvn); 1136 if (akls != NULL) return akls; 1137 Node* k_adr = basic_plus_adr(obj, oopDesc::klass_offset_in_bytes()); 1138 return _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), k_adr, TypeInstPtr::KLASS) ); 1139 } 1140 1141 //-------------------------load_array_length----------------------------------- 1142 Node* GraphKit::load_array_length(Node* array) { 1143 // Special-case a fresh allocation to avoid building nodes: 1144 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(array, &_gvn); 1145 Node *alen; 1146 if (alloc == NULL) { 1147 Node *r_adr = basic_plus_adr(array, arrayOopDesc::length_offset_in_bytes()); 1148 alen = _gvn.transform( new (C) LoadRangeNode(0, immutable_memory(), r_adr, TypeInt::POS)); 1149 } else { 1150 alen = alloc->Ideal_length(); 1151 Node* ccast = alloc->make_ideal_length(_gvn.type(array)->is_oopptr(), &_gvn); 1152 if (ccast != alen) { 1153 alen = _gvn.transform(ccast); 1154 } 1155 } 1156 return alen; 1157 } 1158 1159 //------------------------------do_null_check---------------------------------- 1160 // Helper function to do a NULL pointer check. Returned value is 1161 // the incoming address with NULL casted away. You are allowed to use the 1162 // not-null value only if you are control dependent on the test. 1163 extern int explicit_null_checks_inserted, 1164 explicit_null_checks_elided; 1165 Node* GraphKit::null_check_common(Node* value, BasicType type, 1166 // optional arguments for variations: 1167 bool assert_null, 1168 Node* *null_control) { 1169 assert(!assert_null || null_control == NULL, "not both at once"); 1170 if (stopped()) return top(); 1171 if (!GenerateCompilerNullChecks && !assert_null && null_control == NULL) { 1172 // For some performance testing, we may wish to suppress null checking. 1173 value = cast_not_null(value); // Make it appear to be non-null (4962416). 1174 return value; 1175 } 1176 explicit_null_checks_inserted++; 1177 1178 // Construct NULL check 1179 Node *chk = NULL; 1180 switch(type) { 1181 case T_LONG : chk = new (C) CmpLNode(value, _gvn.zerocon(T_LONG)); break; 1182 case T_INT : chk = new (C) CmpINode(value, _gvn.intcon(0)); break; 1183 case T_ARRAY : // fall through 1184 type = T_OBJECT; // simplify further tests 1185 case T_OBJECT : { 1186 const Type *t = _gvn.type( value ); 1187 1188 const TypeOopPtr* tp = t->isa_oopptr(); 1189 if (tp != NULL && tp->klass() != NULL && !tp->klass()->is_loaded() 1190 // Only for do_null_check, not any of its siblings: 1191 && !assert_null && null_control == NULL) { 1192 // Usually, any field access or invocation on an unloaded oop type 1193 // will simply fail to link, since the statically linked class is 1194 // likely also to be unloaded. However, in -Xcomp mode, sometimes 1195 // the static class is loaded but the sharper oop type is not. 1196 // Rather than checking for this obscure case in lots of places, 1197 // we simply observe that a null check on an unloaded class 1198 // will always be followed by a nonsense operation, so we 1199 // can just issue the uncommon trap here. 1200 // Our access to the unloaded class will only be correct 1201 // after it has been loaded and initialized, which requires 1202 // a trip through the interpreter. 1203 #ifndef PRODUCT 1204 if (WizardMode) { tty->print("Null check of unloaded "); tp->klass()->print(); tty->cr(); } 1205 #endif 1206 uncommon_trap(Deoptimization::Reason_unloaded, 1207 Deoptimization::Action_reinterpret, 1208 tp->klass(), "!loaded"); 1209 return top(); 1210 } 1211 1212 if (assert_null) { 1213 // See if the type is contained in NULL_PTR. 1214 // If so, then the value is already null. 1215 if (t->higher_equal(TypePtr::NULL_PTR)) { 1216 explicit_null_checks_elided++; 1217 return value; // Elided null assert quickly! 1218 } 1219 } else { 1220 // See if mixing in the NULL pointer changes type. 1221 // If so, then the NULL pointer was not allowed in the original 1222 // type. In other words, "value" was not-null. 1223 if (t->meet(TypePtr::NULL_PTR) != t) { 1224 // same as: if (!TypePtr::NULL_PTR->higher_equal(t)) ... 1225 explicit_null_checks_elided++; 1226 return value; // Elided null check quickly! 1227 } 1228 } 1229 chk = new (C) CmpPNode( value, null() ); 1230 break; 1231 } 1232 1233 default: 1234 fatal(err_msg_res("unexpected type: %s", type2name(type))); 1235 } 1236 assert(chk != NULL, "sanity check"); 1237 chk = _gvn.transform(chk); 1238 1239 BoolTest::mask btest = assert_null ? BoolTest::eq : BoolTest::ne; 1240 BoolNode *btst = new (C) BoolNode( chk, btest); 1241 Node *tst = _gvn.transform( btst ); 1242 1243 //----------- 1244 // if peephole optimizations occurred, a prior test existed. 1245 // If a prior test existed, maybe it dominates as we can avoid this test. 1246 if (tst != btst && type == T_OBJECT) { 1247 // At this point we want to scan up the CFG to see if we can 1248 // find an identical test (and so avoid this test altogether). 1249 Node *cfg = control(); 1250 int depth = 0; 1251 while( depth < 16 ) { // Limit search depth for speed 1252 if( cfg->Opcode() == Op_IfTrue && 1253 cfg->in(0)->in(1) == tst ) { 1254 // Found prior test. Use "cast_not_null" to construct an identical 1255 // CastPP (and hence hash to) as already exists for the prior test. 1256 // Return that casted value. 1257 if (assert_null) { 1258 replace_in_map(value, null()); 1259 return null(); // do not issue the redundant test 1260 } 1261 Node *oldcontrol = control(); 1262 set_control(cfg); 1263 Node *res = cast_not_null(value); 1264 set_control(oldcontrol); 1265 explicit_null_checks_elided++; 1266 return res; 1267 } 1268 cfg = IfNode::up_one_dom(cfg, /*linear_only=*/ true); 1269 if (cfg == NULL) break; // Quit at region nodes 1270 depth++; 1271 } 1272 } 1273 1274 //----------- 1275 // Branch to failure if null 1276 float ok_prob = PROB_MAX; // a priori estimate: nulls never happen 1277 Deoptimization::DeoptReason reason; 1278 if (assert_null) 1279 reason = Deoptimization::Reason_null_assert; 1280 else if (type == T_OBJECT) 1281 reason = Deoptimization::Reason_null_check; 1282 else 1283 reason = Deoptimization::Reason_div0_check; 1284 1285 // %%% Since Reason_unhandled is not recorded on a per-bytecode basis, 1286 // ciMethodData::has_trap_at will return a conservative -1 if any 1287 // must-be-null assertion has failed. This could cause performance 1288 // problems for a method after its first do_null_assert failure. 1289 // Consider using 'Reason_class_check' instead? 1290 1291 // To cause an implicit null check, we set the not-null probability 1292 // to the maximum (PROB_MAX). For an explicit check the probability 1293 // is set to a smaller value. 1294 if (null_control != NULL || too_many_traps(reason)) { 1295 // probability is less likely 1296 ok_prob = PROB_LIKELY_MAG(3); 1297 } else if (!assert_null && 1298 (ImplicitNullCheckThreshold > 0) && 1299 method() != NULL && 1300 (method()->method_data()->trap_count(reason) 1301 >= (uint)ImplicitNullCheckThreshold)) { 1302 ok_prob = PROB_LIKELY_MAG(3); 1303 } 1304 1305 if (null_control != NULL) { 1306 IfNode* iff = create_and_map_if(control(), tst, ok_prob, COUNT_UNKNOWN); 1307 Node* null_true = _gvn.transform( new (C) IfFalseNode(iff)); 1308 set_control( _gvn.transform( new (C) IfTrueNode(iff))); 1309 if (null_true == top()) 1310 explicit_null_checks_elided++; 1311 (*null_control) = null_true; 1312 } else { 1313 BuildCutout unless(this, tst, ok_prob); 1314 // Check for optimizer eliding test at parse time 1315 if (stopped()) { 1316 // Failure not possible; do not bother making uncommon trap. 1317 explicit_null_checks_elided++; 1318 } else if (assert_null) { 1319 uncommon_trap(reason, 1320 Deoptimization::Action_make_not_entrant, 1321 NULL, "assert_null"); 1322 } else { 1323 replace_in_map(value, zerocon(type)); 1324 builtin_throw(reason); 1325 } 1326 } 1327 1328 // Must throw exception, fall-thru not possible? 1329 if (stopped()) { 1330 return top(); // No result 1331 } 1332 1333 if (assert_null) { 1334 // Cast obj to null on this path. 1335 replace_in_map(value, zerocon(type)); 1336 return zerocon(type); 1337 } 1338 1339 // Cast obj to not-null on this path, if there is no null_control. 1340 // (If there is a null_control, a non-null value may come back to haunt us.) 1341 if (type == T_OBJECT) { 1342 Node* cast = cast_not_null(value, false); 1343 if (null_control == NULL || (*null_control) == top()) 1344 replace_in_map(value, cast); 1345 value = cast; 1346 } 1347 1348 return value; 1349 } 1350 1351 1352 //------------------------------cast_not_null---------------------------------- 1353 // Cast obj to not-null on this path 1354 Node* GraphKit::cast_not_null(Node* obj, bool do_replace_in_map) { 1355 const Type *t = _gvn.type(obj); 1356 const Type *t_not_null = t->join(TypePtr::NOTNULL); 1357 // Object is already not-null? 1358 if( t == t_not_null ) return obj; 1359 1360 Node *cast = new (C) CastPPNode(obj,t_not_null); 1361 cast->init_req(0, control()); 1362 cast = _gvn.transform( cast ); 1363 1364 // Scan for instances of 'obj' in the current JVM mapping. 1365 // These instances are known to be not-null after the test. 1366 if (do_replace_in_map) 1367 replace_in_map(obj, cast); 1368 1369 return cast; // Return casted value 1370 } 1371 1372 1373 //--------------------------replace_in_map------------------------------------- 1374 void GraphKit::replace_in_map(Node* old, Node* neww) { 1375 this->map()->replace_edge(old, neww); 1376 1377 // Note: This operation potentially replaces any edge 1378 // on the map. This includes locals, stack, and monitors 1379 // of the current (innermost) JVM state. 1380 1381 // We can consider replacing in caller maps. 1382 // The idea would be that an inlined function's null checks 1383 // can be shared with the entire inlining tree. 1384 // The expense of doing this is that the PreserveJVMState class 1385 // would have to preserve caller states too, with a deep copy. 1386 } 1387 1388 1389 //============================================================================= 1390 //--------------------------------memory--------------------------------------- 1391 Node* GraphKit::memory(uint alias_idx) { 1392 MergeMemNode* mem = merged_memory(); 1393 Node* p = mem->memory_at(alias_idx); 1394 _gvn.set_type(p, Type::MEMORY); // must be mapped 1395 return p; 1396 } 1397 1398 //-----------------------------reset_memory------------------------------------ 1399 Node* GraphKit::reset_memory() { 1400 Node* mem = map()->memory(); 1401 // do not use this node for any more parsing! 1402 debug_only( map()->set_memory((Node*)NULL) ); 1403 return _gvn.transform( mem ); 1404 } 1405 1406 //------------------------------set_all_memory--------------------------------- 1407 void GraphKit::set_all_memory(Node* newmem) { 1408 Node* mergemem = MergeMemNode::make(C, newmem); 1409 gvn().set_type_bottom(mergemem); 1410 map()->set_memory(mergemem); 1411 } 1412 1413 //------------------------------set_all_memory_call---------------------------- 1414 void GraphKit::set_all_memory_call(Node* call, bool separate_io_proj) { 1415 Node* newmem = _gvn.transform( new (C) ProjNode(call, TypeFunc::Memory, separate_io_proj) ); 1416 set_all_memory(newmem); 1417 } 1418 1419 //============================================================================= 1420 // 1421 // parser factory methods for MemNodes 1422 // 1423 // These are layered on top of the factory methods in LoadNode and StoreNode, 1424 // and integrate with the parser's memory state and _gvn engine. 1425 // 1426 1427 // factory methods in "int adr_idx" 1428 Node* GraphKit::make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, 1429 int adr_idx, 1430 bool require_atomic_access) { 1431 assert(adr_idx != Compile::AliasIdxTop, "use other make_load factory" ); 1432 const TypePtr* adr_type = NULL; // debug-mode-only argument 1433 debug_only(adr_type = C->get_adr_type(adr_idx)); 1434 Node* mem = memory(adr_idx); 1435 Node* ld; 1436 if (require_atomic_access && bt == T_LONG) { 1437 ld = LoadLNode::make_atomic(C, ctl, mem, adr, adr_type, t); 1438 } else { 1439 ld = LoadNode::make(_gvn, ctl, mem, adr, adr_type, t, bt); 1440 } 1441 return _gvn.transform(ld); 1442 } 1443 1444 Node* GraphKit::store_to_memory(Node* ctl, Node* adr, Node *val, BasicType bt, 1445 int adr_idx, 1446 bool require_atomic_access) { 1447 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); 1448 const TypePtr* adr_type = NULL; 1449 debug_only(adr_type = C->get_adr_type(adr_idx)); 1450 Node *mem = memory(adr_idx); 1451 Node* st; 1452 if (require_atomic_access && bt == T_LONG) { 1453 st = StoreLNode::make_atomic(C, ctl, mem, adr, adr_type, val); 1454 } else { 1455 st = StoreNode::make(_gvn, ctl, mem, adr, adr_type, val, bt); 1456 } 1457 st = _gvn.transform(st); 1458 set_memory(st, adr_idx); 1459 // Back-to-back stores can only remove intermediate store with DU info 1460 // so push on worklist for optimizer. 1461 if (mem->req() > MemNode::Address && adr == mem->in(MemNode::Address)) 1462 record_for_igvn(st); 1463 1464 return st; 1465 } 1466 1467 1468 void GraphKit::pre_barrier(bool do_load, 1469 Node* ctl, 1470 Node* obj, 1471 Node* adr, 1472 uint adr_idx, 1473 Node* val, 1474 const TypeOopPtr* val_type, 1475 Node* pre_val, 1476 BasicType bt) { 1477 1478 BarrierSet* bs = Universe::heap()->barrier_set(); 1479 set_control(ctl); 1480 switch (bs->kind()) { 1481 case BarrierSet::G1SATBCT: 1482 case BarrierSet::G1SATBCTLogging: 1483 g1_write_barrier_pre(do_load, obj, adr, adr_idx, val, val_type, pre_val, bt); 1484 break; 1485 1486 case BarrierSet::CardTableModRef: 1487 case BarrierSet::CardTableExtension: 1488 case BarrierSet::ModRef: 1489 break; 1490 1491 case BarrierSet::Other: 1492 default : 1493 ShouldNotReachHere(); 1494 1495 } 1496 } 1497 1498 void GraphKit::post_barrier(Node* ctl, 1499 Node* store, 1500 Node* obj, 1501 Node* adr, 1502 uint adr_idx, 1503 Node* val, 1504 BasicType bt, 1505 bool use_precise) { 1506 BarrierSet* bs = Universe::heap()->barrier_set(); 1507 set_control(ctl); 1508 switch (bs->kind()) { 1509 case BarrierSet::G1SATBCT: 1510 case BarrierSet::G1SATBCTLogging: 1511 g1_write_barrier_post(store, obj, adr, adr_idx, val, bt, use_precise); 1512 break; 1513 1514 case BarrierSet::CardTableModRef: 1515 case BarrierSet::CardTableExtension: 1516 write_barrier_post(store, obj, adr, adr_idx, val, use_precise); 1517 break; 1518 1519 case BarrierSet::ModRef: 1520 break; 1521 1522 case BarrierSet::Other: 1523 default : 1524 ShouldNotReachHere(); 1525 1526 } 1527 } 1528 1529 Node* GraphKit::store_oop(Node* ctl, 1530 Node* obj, 1531 Node* adr, 1532 const TypePtr* adr_type, 1533 Node* val, 1534 const TypeOopPtr* val_type, 1535 BasicType bt, 1536 bool use_precise) { 1537 // Transformation of a value which could be NULL pointer (CastPP #NULL) 1538 // could be delayed during Parse (for example, in adjust_map_after_if()). 1539 // Execute transformation here to avoid barrier generation in such case. 1540 if (_gvn.type(val) == TypePtr::NULL_PTR) 1541 val = _gvn.makecon(TypePtr::NULL_PTR); 1542 1543 set_control(ctl); 1544 if (stopped()) return top(); // Dead path ? 1545 1546 assert(bt == T_OBJECT, "sanity"); 1547 assert(val != NULL, "not dead path"); 1548 uint adr_idx = C->get_alias_index(adr_type); 1549 assert(adr_idx != Compile::AliasIdxTop, "use other store_to_memory factory" ); 1550 1551 pre_barrier(true /* do_load */, 1552 control(), obj, adr, adr_idx, val, val_type, 1553 NULL /* pre_val */, 1554 bt); 1555 1556 Node* store = store_to_memory(control(), adr, val, bt, adr_idx); 1557 post_barrier(control(), store, obj, adr, adr_idx, val, bt, use_precise); 1558 return store; 1559 } 1560 1561 // Could be an array or object we don't know at compile time (unsafe ref.) 1562 Node* GraphKit::store_oop_to_unknown(Node* ctl, 1563 Node* obj, // containing obj 1564 Node* adr, // actual adress to store val at 1565 const TypePtr* adr_type, 1566 Node* val, 1567 BasicType bt) { 1568 Compile::AliasType* at = C->alias_type(adr_type); 1569 const TypeOopPtr* val_type = NULL; 1570 if (adr_type->isa_instptr()) { 1571 if (at->field() != NULL) { 1572 // known field. This code is a copy of the do_put_xxx logic. 1573 ciField* field = at->field(); 1574 if (!field->type()->is_loaded()) { 1575 val_type = TypeInstPtr::BOTTOM; 1576 } else { 1577 val_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); 1578 } 1579 } 1580 } else if (adr_type->isa_aryptr()) { 1581 val_type = adr_type->is_aryptr()->elem()->make_oopptr(); 1582 } 1583 if (val_type == NULL) { 1584 val_type = TypeInstPtr::BOTTOM; 1585 } 1586 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true); 1587 } 1588 1589 1590 //-------------------------array_element_address------------------------- 1591 Node* GraphKit::array_element_address(Node* ary, Node* idx, BasicType elembt, 1592 const TypeInt* sizetype) { 1593 uint shift = exact_log2(type2aelembytes(elembt)); 1594 uint header = arrayOopDesc::base_offset_in_bytes(elembt); 1595 1596 // short-circuit a common case (saves lots of confusing waste motion) 1597 jint idx_con = find_int_con(idx, -1); 1598 if (idx_con >= 0) { 1599 intptr_t offset = header + ((intptr_t)idx_con << shift); 1600 return basic_plus_adr(ary, offset); 1601 } 1602 1603 // must be correct type for alignment purposes 1604 Node* base = basic_plus_adr(ary, header); 1605 #ifdef _LP64 1606 // The scaled index operand to AddP must be a clean 64-bit value. 1607 // Java allows a 32-bit int to be incremented to a negative 1608 // value, which appears in a 64-bit register as a large 1609 // positive number. Using that large positive number as an 1610 // operand in pointer arithmetic has bad consequences. 1611 // On the other hand, 32-bit overflow is rare, and the possibility 1612 // can often be excluded, if we annotate the ConvI2L node with 1613 // a type assertion that its value is known to be a small positive 1614 // number. (The prior range check has ensured this.) 1615 // This assertion is used by ConvI2LNode::Ideal. 1616 int index_max = max_jint - 1; // array size is max_jint, index is one less 1617 if (sizetype != NULL) index_max = sizetype->_hi - 1; 1618 const TypeLong* lidxtype = TypeLong::make(CONST64(0), index_max, Type::WidenMax); 1619 idx = _gvn.transform( new (C) ConvI2LNode(idx, lidxtype) ); 1620 #endif 1621 Node* scale = _gvn.transform( new (C) LShiftXNode(idx, intcon(shift)) ); 1622 return basic_plus_adr(ary, base, scale); 1623 } 1624 1625 //-------------------------load_array_element------------------------- 1626 Node* GraphKit::load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype) { 1627 const Type* elemtype = arytype->elem(); 1628 BasicType elembt = elemtype->array_element_basic_type(); 1629 Node* adr = array_element_address(ary, idx, elembt, arytype->size()); 1630 Node* ld = make_load(ctl, adr, elemtype, elembt, arytype); 1631 return ld; 1632 } 1633 1634 //-------------------------set_arguments_for_java_call------------------------- 1635 // Arguments (pre-popped from the stack) are taken from the JVMS. 1636 void GraphKit::set_arguments_for_java_call(CallJavaNode* call) { 1637 // Add the call arguments: 1638 uint nargs = call->method()->arg_size(); 1639 for (uint i = 0; i < nargs; i++) { 1640 Node* arg = argument(i); 1641 call->init_req(i + TypeFunc::Parms, arg); 1642 } 1643 } 1644 1645 //---------------------------set_edges_for_java_call--------------------------- 1646 // Connect a newly created call into the current JVMS. 1647 // A return value node (if any) is returned from set_edges_for_java_call. 1648 void GraphKit::set_edges_for_java_call(CallJavaNode* call, bool must_throw, bool separate_io_proj) { 1649 1650 // Add the predefined inputs: 1651 call->init_req( TypeFunc::Control, control() ); 1652 call->init_req( TypeFunc::I_O , i_o() ); 1653 call->init_req( TypeFunc::Memory , reset_memory() ); 1654 call->init_req( TypeFunc::FramePtr, frameptr() ); 1655 call->init_req( TypeFunc::ReturnAdr, top() ); 1656 1657 add_safepoint_edges(call, must_throw); 1658 1659 Node* xcall = _gvn.transform(call); 1660 1661 if (xcall == top()) { 1662 set_control(top()); 1663 return; 1664 } 1665 assert(xcall == call, "call identity is stable"); 1666 1667 // Re-use the current map to produce the result. 1668 1669 set_control(_gvn.transform(new (C) ProjNode(call, TypeFunc::Control))); 1670 set_i_o( _gvn.transform(new (C) ProjNode(call, TypeFunc::I_O , separate_io_proj))); 1671 set_all_memory_call(xcall, separate_io_proj); 1672 1673 //return xcall; // no need, caller already has it 1674 } 1675 1676 Node* GraphKit::set_results_for_java_call(CallJavaNode* call, bool separate_io_proj) { 1677 if (stopped()) return top(); // maybe the call folded up? 1678 1679 // Capture the return value, if any. 1680 Node* ret; 1681 if (call->method() == NULL || 1682 call->method()->return_type()->basic_type() == T_VOID) 1683 ret = top(); 1684 else ret = _gvn.transform(new (C) ProjNode(call, TypeFunc::Parms)); 1685 1686 // Note: Since any out-of-line call can produce an exception, 1687 // we always insert an I_O projection from the call into the result. 1688 1689 make_slow_call_ex(call, env()->Throwable_klass(), separate_io_proj); 1690 1691 if (separate_io_proj) { 1692 // The caller requested separate projections be used by the fall 1693 // through and exceptional paths, so replace the projections for 1694 // the fall through path. 1695 set_i_o(_gvn.transform( new (C) ProjNode(call, TypeFunc::I_O) )); 1696 set_all_memory(_gvn.transform( new (C) ProjNode(call, TypeFunc::Memory) )); 1697 } 1698 return ret; 1699 } 1700 1701 //--------------------set_predefined_input_for_runtime_call-------------------- 1702 // Reading and setting the memory state is way conservative here. 1703 // The real problem is that I am not doing real Type analysis on memory, 1704 // so I cannot distinguish card mark stores from other stores. Across a GC 1705 // point the Store Barrier and the card mark memory has to agree. I cannot 1706 // have a card mark store and its barrier split across the GC point from 1707 // either above or below. Here I get that to happen by reading ALL of memory. 1708 // A better answer would be to separate out card marks from other memory. 1709 // For now, return the input memory state, so that it can be reused 1710 // after the call, if this call has restricted memory effects. 1711 Node* GraphKit::set_predefined_input_for_runtime_call(SafePointNode* call) { 1712 // Set fixed predefined input arguments 1713 Node* memory = reset_memory(); 1714 call->init_req( TypeFunc::Control, control() ); 1715 call->init_req( TypeFunc::I_O, top() ); // does no i/o 1716 call->init_req( TypeFunc::Memory, memory ); // may gc ptrs 1717 call->init_req( TypeFunc::FramePtr, frameptr() ); 1718 call->init_req( TypeFunc::ReturnAdr, top() ); 1719 return memory; 1720 } 1721 1722 //-------------------set_predefined_output_for_runtime_call-------------------- 1723 // Set control and memory (not i_o) from the call. 1724 // If keep_mem is not NULL, use it for the output state, 1725 // except for the RawPtr output of the call, if hook_mem is TypeRawPtr::BOTTOM. 1726 // If hook_mem is NULL, this call produces no memory effects at all. 1727 // If hook_mem is a Java-visible memory slice (such as arraycopy operands), 1728 // then only that memory slice is taken from the call. 1729 // In the last case, we must put an appropriate memory barrier before 1730 // the call, so as to create the correct anti-dependencies on loads 1731 // preceding the call. 1732 void GraphKit::set_predefined_output_for_runtime_call(Node* call, 1733 Node* keep_mem, 1734 const TypePtr* hook_mem) { 1735 // no i/o 1736 set_control(_gvn.transform( new (C) ProjNode(call,TypeFunc::Control) )); 1737 if (keep_mem) { 1738 // First clone the existing memory state 1739 set_all_memory(keep_mem); 1740 if (hook_mem != NULL) { 1741 // Make memory for the call 1742 Node* mem = _gvn.transform( new (C) ProjNode(call, TypeFunc::Memory) ); 1743 // Set the RawPtr memory state only. This covers all the heap top/GC stuff 1744 // We also use hook_mem to extract specific effects from arraycopy stubs. 1745 set_memory(mem, hook_mem); 1746 } 1747 // ...else the call has NO memory effects. 1748 1749 // Make sure the call advertises its memory effects precisely. 1750 // This lets us build accurate anti-dependences in gcm.cpp. 1751 assert(C->alias_type(call->adr_type()) == C->alias_type(hook_mem), 1752 "call node must be constructed correctly"); 1753 } else { 1754 assert(hook_mem == NULL, ""); 1755 // This is not a "slow path" call; all memory comes from the call. 1756 set_all_memory_call(call); 1757 } 1758 } 1759 1760 1761 // Replace the call with the current state of the kit. 1762 void GraphKit::replace_call(CallNode* call, Node* result) { 1763 JVMState* ejvms = NULL; 1764 if (has_exceptions()) { 1765 ejvms = transfer_exceptions_into_jvms(); 1766 } 1767 1768 SafePointNode* final_state = stop(); 1769 1770 // Find all the needed outputs of this call 1771 CallProjections callprojs; 1772 call->extract_projections(&callprojs, true); 1773 1774 Node* init_mem = call->in(TypeFunc::Memory); 1775 Node* final_mem = final_state->in(TypeFunc::Memory); 1776 Node* final_ctl = final_state->in(TypeFunc::Control); 1777 Node* final_io = final_state->in(TypeFunc::I_O); 1778 1779 // Replace all the old call edges with the edges from the inlining result 1780 if (callprojs.fallthrough_catchproj != NULL) { 1781 C->gvn_replace_by(callprojs.fallthrough_catchproj, final_ctl); 1782 } 1783 if (callprojs.fallthrough_memproj != NULL) { 1784 C->gvn_replace_by(callprojs.fallthrough_memproj, final_mem); 1785 } 1786 if (callprojs.fallthrough_ioproj != NULL) { 1787 C->gvn_replace_by(callprojs.fallthrough_ioproj, final_io); 1788 } 1789 1790 // Replace the result with the new result if it exists and is used 1791 if (callprojs.resproj != NULL && result != NULL) { 1792 C->gvn_replace_by(callprojs.resproj, result); 1793 } 1794 1795 if (ejvms == NULL) { 1796 // No exception edges to simply kill off those paths 1797 if (callprojs.catchall_catchproj != NULL) { 1798 C->gvn_replace_by(callprojs.catchall_catchproj, C->top()); 1799 } 1800 if (callprojs.catchall_memproj != NULL) { 1801 C->gvn_replace_by(callprojs.catchall_memproj, C->top()); 1802 } 1803 if (callprojs.catchall_ioproj != NULL) { 1804 C->gvn_replace_by(callprojs.catchall_ioproj, C->top()); 1805 } 1806 // Replace the old exception object with top 1807 if (callprojs.exobj != NULL) { 1808 C->gvn_replace_by(callprojs.exobj, C->top()); 1809 } 1810 } else { 1811 GraphKit ekit(ejvms); 1812 1813 // Load my combined exception state into the kit, with all phis transformed: 1814 SafePointNode* ex_map = ekit.combine_and_pop_all_exception_states(); 1815 1816 Node* ex_oop = ekit.use_exception_state(ex_map); 1817 if (callprojs.catchall_catchproj != NULL) { 1818 C->gvn_replace_by(callprojs.catchall_catchproj, ekit.control()); 1819 } 1820 if (callprojs.catchall_memproj != NULL) { 1821 C->gvn_replace_by(callprojs.catchall_memproj, ekit.reset_memory()); 1822 } 1823 if (callprojs.catchall_ioproj != NULL) { 1824 C->gvn_replace_by(callprojs.catchall_ioproj, ekit.i_o()); 1825 } 1826 1827 // Replace the old exception object with the newly created one 1828 if (callprojs.exobj != NULL) { 1829 C->gvn_replace_by(callprojs.exobj, ex_oop); 1830 } 1831 } 1832 1833 // Disconnect the call from the graph 1834 call->disconnect_inputs(NULL, C); 1835 C->gvn_replace_by(call, C->top()); 1836 1837 // Clean up any MergeMems that feed other MergeMems since the 1838 // optimizer doesn't like that. 1839 if (final_mem->is_MergeMem()) { 1840 Node_List wl; 1841 for (SimpleDUIterator i(final_mem); i.has_next(); i.next()) { 1842 Node* m = i.get(); 1843 if (m->is_MergeMem() && !wl.contains(m)) { 1844 wl.push(m); 1845 } 1846 } 1847 while (wl.size() > 0) { 1848 _gvn.transform(wl.pop()); 1849 } 1850 } 1851 } 1852 1853 1854 //------------------------------increment_counter------------------------------ 1855 // for statistics: increment a VM counter by 1 1856 1857 void GraphKit::increment_counter(address counter_addr) { 1858 Node* adr1 = makecon(TypeRawPtr::make(counter_addr)); 1859 increment_counter(adr1); 1860 } 1861 1862 void GraphKit::increment_counter(Node* counter_addr) { 1863 int adr_type = Compile::AliasIdxRaw; 1864 Node* ctrl = control(); 1865 Node* cnt = make_load(ctrl, counter_addr, TypeInt::INT, T_INT, adr_type); 1866 Node* incr = _gvn.transform(new (C) AddINode(cnt, _gvn.intcon(1))); 1867 store_to_memory( ctrl, counter_addr, incr, T_INT, adr_type ); 1868 } 1869 1870 1871 //------------------------------uncommon_trap---------------------------------- 1872 // Bail out to the interpreter in mid-method. Implemented by calling the 1873 // uncommon_trap blob. This helper function inserts a runtime call with the 1874 // right debug info. 1875 void GraphKit::uncommon_trap(int trap_request, 1876 ciKlass* klass, const char* comment, 1877 bool must_throw, 1878 bool keep_exact_action) { 1879 if (failing()) stop(); 1880 if (stopped()) return; // trap reachable? 1881 1882 // Note: If ProfileTraps is true, and if a deopt. actually 1883 // occurs here, the runtime will make sure an MDO exists. There is 1884 // no need to call method()->ensure_method_data() at this point. 1885 1886 // Set the stack pointer to the right value for reexecution: 1887 set_sp(reexecute_sp()); 1888 1889 #ifdef ASSERT 1890 if (!must_throw) { 1891 // Make sure the stack has at least enough depth to execute 1892 // the current bytecode. 1893 int inputs, ignored_depth; 1894 if (compute_stack_effects(inputs, ignored_depth)) { 1895 assert(sp() >= inputs, err_msg_res("must have enough JVMS stack to execute %s: sp=%d, inputs=%d", 1896 Bytecodes::name(java_bc()), sp(), inputs)); 1897 } 1898 } 1899 #endif 1900 1901 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(trap_request); 1902 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(trap_request); 1903 1904 switch (action) { 1905 case Deoptimization::Action_maybe_recompile: 1906 case Deoptimization::Action_reinterpret: 1907 // Temporary fix for 6529811 to allow virtual calls to be sure they 1908 // get the chance to go from mono->bi->mega 1909 if (!keep_exact_action && 1910 Deoptimization::trap_request_index(trap_request) < 0 && 1911 too_many_recompiles(reason)) { 1912 // This BCI is causing too many recompilations. 1913 action = Deoptimization::Action_none; 1914 trap_request = Deoptimization::make_trap_request(reason, action); 1915 } else { 1916 C->set_trap_can_recompile(true); 1917 } 1918 break; 1919 case Deoptimization::Action_make_not_entrant: 1920 C->set_trap_can_recompile(true); 1921 break; 1922 #ifdef ASSERT 1923 case Deoptimization::Action_none: 1924 case Deoptimization::Action_make_not_compilable: 1925 break; 1926 default: 1927 fatal(err_msg_res("unknown action %d: %s", action, Deoptimization::trap_action_name(action))); 1928 break; 1929 #endif 1930 } 1931 1932 if (TraceOptoParse) { 1933 char buf[100]; 1934 tty->print_cr("Uncommon trap %s at bci:%d", 1935 Deoptimization::format_trap_request(buf, sizeof(buf), 1936 trap_request), bci()); 1937 } 1938 1939 CompileLog* log = C->log(); 1940 if (log != NULL) { 1941 int kid = (klass == NULL)? -1: log->identify(klass); 1942 log->begin_elem("uncommon_trap bci='%d'", bci()); 1943 char buf[100]; 1944 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), 1945 trap_request)); 1946 if (kid >= 0) log->print(" klass='%d'", kid); 1947 if (comment != NULL) log->print(" comment='%s'", comment); 1948 log->end_elem(); 1949 } 1950 1951 // Make sure any guarding test views this path as very unlikely 1952 Node *i0 = control()->in(0); 1953 if (i0 != NULL && i0->is_If()) { // Found a guarding if test? 1954 IfNode *iff = i0->as_If(); 1955 float f = iff->_prob; // Get prob 1956 if (control()->Opcode() == Op_IfTrue) { 1957 if (f > PROB_UNLIKELY_MAG(4)) 1958 iff->_prob = PROB_MIN; 1959 } else { 1960 if (f < PROB_LIKELY_MAG(4)) 1961 iff->_prob = PROB_MAX; 1962 } 1963 } 1964 1965 // Clear out dead values from the debug info. 1966 kill_dead_locals(); 1967 1968 // Now insert the uncommon trap subroutine call 1969 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point(); 1970 const TypePtr* no_memory_effects = NULL; 1971 // Pass the index of the class to be loaded 1972 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON | 1973 (must_throw ? RC_MUST_THROW : 0), 1974 OptoRuntime::uncommon_trap_Type(), 1975 call_addr, "uncommon_trap", no_memory_effects, 1976 intcon(trap_request)); 1977 assert(call->as_CallStaticJava()->uncommon_trap_request() == trap_request, 1978 "must extract request correctly from the graph"); 1979 assert(trap_request != 0, "zero value reserved by uncommon_trap_request"); 1980 1981 call->set_req(TypeFunc::ReturnAdr, returnadr()); 1982 // The debug info is the only real input to this call. 1983 1984 // Halt-and-catch fire here. The above call should never return! 1985 HaltNode* halt = new(C) HaltNode(control(), frameptr()); 1986 _gvn.set_type_bottom(halt); 1987 root()->add_req(halt); 1988 1989 stop_and_kill_map(); 1990 } 1991 1992 1993 //--------------------------just_allocated_object------------------------------ 1994 // Report the object that was just allocated. 1995 // It must be the case that there are no intervening safepoints. 1996 // We use this to determine if an object is so "fresh" that 1997 // it does not require card marks. 1998 Node* GraphKit::just_allocated_object(Node* current_control) { 1999 if (C->recent_alloc_ctl() == current_control) 2000 return C->recent_alloc_obj(); 2001 return NULL; 2002 } 2003 2004 2005 void GraphKit::round_double_arguments(ciMethod* dest_method) { 2006 // (Note: TypeFunc::make has a cache that makes this fast.) 2007 const TypeFunc* tf = TypeFunc::make(dest_method); 2008 int nargs = tf->_domain->_cnt - TypeFunc::Parms; 2009 for (int j = 0; j < nargs; j++) { 2010 const Type *targ = tf->_domain->field_at(j + TypeFunc::Parms); 2011 if( targ->basic_type() == T_DOUBLE ) { 2012 // If any parameters are doubles, they must be rounded before 2013 // the call, dstore_rounding does gvn.transform 2014 Node *arg = argument(j); 2015 arg = dstore_rounding(arg); 2016 set_argument(j, arg); 2017 } 2018 } 2019 } 2020 2021 void GraphKit::round_double_result(ciMethod* dest_method) { 2022 // A non-strict method may return a double value which has an extended 2023 // exponent, but this must not be visible in a caller which is 'strict' 2024 // If a strict caller invokes a non-strict callee, round a double result 2025 2026 BasicType result_type = dest_method->return_type()->basic_type(); 2027 assert( method() != NULL, "must have caller context"); 2028 if( result_type == T_DOUBLE && method()->is_strict() && !dest_method->is_strict() ) { 2029 // Destination method's return value is on top of stack 2030 // dstore_rounding() does gvn.transform 2031 Node *result = pop_pair(); 2032 result = dstore_rounding(result); 2033 push_pair(result); 2034 } 2035 } 2036 2037 // rounding for strict float precision conformance 2038 Node* GraphKit::precision_rounding(Node* n) { 2039 return UseStrictFP && _method->flags().is_strict() 2040 && UseSSE == 0 && Matcher::strict_fp_requires_explicit_rounding 2041 ? _gvn.transform( new (C) RoundFloatNode(0, n) ) 2042 : n; 2043 } 2044 2045 // rounding for strict double precision conformance 2046 Node* GraphKit::dprecision_rounding(Node *n) { 2047 return UseStrictFP && _method->flags().is_strict() 2048 && UseSSE <= 1 && Matcher::strict_fp_requires_explicit_rounding 2049 ? _gvn.transform( new (C) RoundDoubleNode(0, n) ) 2050 : n; 2051 } 2052 2053 // rounding for non-strict double stores 2054 Node* GraphKit::dstore_rounding(Node* n) { 2055 return Matcher::strict_fp_requires_explicit_rounding 2056 && UseSSE <= 1 2057 ? _gvn.transform( new (C) RoundDoubleNode(0, n) ) 2058 : n; 2059 } 2060 2061 //============================================================================= 2062 // Generate a fast path/slow path idiom. Graph looks like: 2063 // [foo] indicates that 'foo' is a parameter 2064 // 2065 // [in] NULL 2066 // \ / 2067 // CmpP 2068 // Bool ne 2069 // If 2070 // / \ 2071 // True False-<2> 2072 // / | 2073 // / cast_not_null 2074 // Load | | ^ 2075 // [fast_test] | | 2076 // gvn to opt_test | | 2077 // / \ | <1> 2078 // True False | 2079 // | \\ | 2080 // [slow_call] \[fast_result] 2081 // Ctl Val \ \ 2082 // | \ \ 2083 // Catch <1> \ \ 2084 // / \ ^ \ \ 2085 // Ex No_Ex | \ \ 2086 // | \ \ | \ <2> \ 2087 // ... \ [slow_res] | | \ [null_result] 2088 // \ \--+--+--- | | 2089 // \ | / \ | / 2090 // --------Region Phi 2091 // 2092 //============================================================================= 2093 // Code is structured as a series of driver functions all called 'do_XXX' that 2094 // call a set of helper functions. Helper functions first, then drivers. 2095 2096 //------------------------------null_check_oop--------------------------------- 2097 // Null check oop. Set null-path control into Region in slot 3. 2098 // Make a cast-not-nullness use the other not-null control. Return cast. 2099 Node* GraphKit::null_check_oop(Node* value, Node* *null_control, 2100 bool never_see_null) { 2101 // Initial NULL check taken path 2102 (*null_control) = top(); 2103 Node* cast = null_check_common(value, T_OBJECT, false, null_control); 2104 2105 // Generate uncommon_trap: 2106 if (never_see_null && (*null_control) != top()) { 2107 // If we see an unexpected null at a check-cast we record it and force a 2108 // recompile; the offending check-cast will be compiled to handle NULLs. 2109 // If we see more than one offending BCI, then all checkcasts in the 2110 // method will be compiled to handle NULLs. 2111 PreserveJVMState pjvms(this); 2112 set_control(*null_control); 2113 replace_in_map(value, null()); 2114 uncommon_trap(Deoptimization::Reason_null_check, 2115 Deoptimization::Action_make_not_entrant); 2116 (*null_control) = top(); // NULL path is dead 2117 } 2118 2119 // Cast away null-ness on the result 2120 return cast; 2121 } 2122 2123 //------------------------------opt_iff---------------------------------------- 2124 // Optimize the fast-check IfNode. Set the fast-path region slot 2. 2125 // Return slow-path control. 2126 Node* GraphKit::opt_iff(Node* region, Node* iff) { 2127 IfNode *opt_iff = _gvn.transform(iff)->as_If(); 2128 2129 // Fast path taken; set region slot 2 2130 Node *fast_taken = _gvn.transform( new (C) IfFalseNode(opt_iff) ); 2131 region->init_req(2,fast_taken); // Capture fast-control 2132 2133 // Fast path not-taken, i.e. slow path 2134 Node *slow_taken = _gvn.transform( new (C) IfTrueNode(opt_iff) ); 2135 return slow_taken; 2136 } 2137 2138 //-----------------------------make_runtime_call------------------------------- 2139 Node* GraphKit::make_runtime_call(int flags, 2140 const TypeFunc* call_type, address call_addr, 2141 const char* call_name, 2142 const TypePtr* adr_type, 2143 // The following parms are all optional. 2144 // The first NULL ends the list. 2145 Node* parm0, Node* parm1, 2146 Node* parm2, Node* parm3, 2147 Node* parm4, Node* parm5, 2148 Node* parm6, Node* parm7) { 2149 // Slow-path call 2150 bool is_leaf = !(flags & RC_NO_LEAF); 2151 bool has_io = (!is_leaf && !(flags & RC_NO_IO)); 2152 if (call_name == NULL) { 2153 assert(!is_leaf, "must supply name for leaf"); 2154 call_name = OptoRuntime::stub_name(call_addr); 2155 } 2156 CallNode* call; 2157 if (!is_leaf) { 2158 call = new(C) CallStaticJavaNode(call_type, call_addr, call_name, 2159 bci(), adr_type); 2160 } else if (flags & RC_NO_FP) { 2161 call = new(C) CallLeafNoFPNode(call_type, call_addr, call_name, adr_type); 2162 } else { 2163 call = new(C) CallLeafNode(call_type, call_addr, call_name, adr_type); 2164 } 2165 2166 // The following is similar to set_edges_for_java_call, 2167 // except that the memory effects of the call are restricted to AliasIdxRaw. 2168 2169 // Slow path call has no side-effects, uses few values 2170 bool wide_in = !(flags & RC_NARROW_MEM); 2171 bool wide_out = (C->get_alias_index(adr_type) == Compile::AliasIdxBot); 2172 2173 Node* prev_mem = NULL; 2174 if (wide_in) { 2175 prev_mem = set_predefined_input_for_runtime_call(call); 2176 } else { 2177 assert(!wide_out, "narrow in => narrow out"); 2178 Node* narrow_mem = memory(adr_type); 2179 prev_mem = reset_memory(); 2180 map()->set_memory(narrow_mem); 2181 set_predefined_input_for_runtime_call(call); 2182 } 2183 2184 // Hook each parm in order. Stop looking at the first NULL. 2185 if (parm0 != NULL) { call->init_req(TypeFunc::Parms+0, parm0); 2186 if (parm1 != NULL) { call->init_req(TypeFunc::Parms+1, parm1); 2187 if (parm2 != NULL) { call->init_req(TypeFunc::Parms+2, parm2); 2188 if (parm3 != NULL) { call->init_req(TypeFunc::Parms+3, parm3); 2189 if (parm4 != NULL) { call->init_req(TypeFunc::Parms+4, parm4); 2190 if (parm5 != NULL) { call->init_req(TypeFunc::Parms+5, parm5); 2191 if (parm6 != NULL) { call->init_req(TypeFunc::Parms+6, parm6); 2192 if (parm7 != NULL) { call->init_req(TypeFunc::Parms+7, parm7); 2193 /* close each nested if ===> */ } } } } } } } } 2194 assert(call->in(call->req()-1) != NULL, "must initialize all parms"); 2195 2196 if (!is_leaf) { 2197 // Non-leaves can block and take safepoints: 2198 add_safepoint_edges(call, ((flags & RC_MUST_THROW) != 0)); 2199 } 2200 // Non-leaves can throw exceptions: 2201 if (has_io) { 2202 call->set_req(TypeFunc::I_O, i_o()); 2203 } 2204 2205 if (flags & RC_UNCOMMON) { 2206 // Set the count to a tiny probability. Cf. Estimate_Block_Frequency. 2207 // (An "if" probability corresponds roughly to an unconditional count. 2208 // Sort of.) 2209 call->set_cnt(PROB_UNLIKELY_MAG(4)); 2210 } 2211 2212 Node* c = _gvn.transform(call); 2213 assert(c == call, "cannot disappear"); 2214 2215 if (wide_out) { 2216 // Slow path call has full side-effects. 2217 set_predefined_output_for_runtime_call(call); 2218 } else { 2219 // Slow path call has few side-effects, and/or sets few values. 2220 set_predefined_output_for_runtime_call(call, prev_mem, adr_type); 2221 } 2222 2223 if (has_io) { 2224 set_i_o(_gvn.transform(new (C) ProjNode(call, TypeFunc::I_O))); 2225 } 2226 return call; 2227 2228 } 2229 2230 //------------------------------merge_memory----------------------------------- 2231 // Merge memory from one path into the current memory state. 2232 void GraphKit::merge_memory(Node* new_mem, Node* region, int new_path) { 2233 for (MergeMemStream mms(merged_memory(), new_mem->as_MergeMem()); mms.next_non_empty2(); ) { 2234 Node* old_slice = mms.force_memory(); 2235 Node* new_slice = mms.memory2(); 2236 if (old_slice != new_slice) { 2237 PhiNode* phi; 2238 if (new_slice->is_Phi() && new_slice->as_Phi()->region() == region) { 2239 phi = new_slice->as_Phi(); 2240 #ifdef ASSERT 2241 if (old_slice->is_Phi() && old_slice->as_Phi()->region() == region) 2242 old_slice = old_slice->in(new_path); 2243 // Caller is responsible for ensuring that any pre-existing 2244 // phis are already aware of old memory. 2245 int old_path = (new_path > 1) ? 1 : 2; // choose old_path != new_path 2246 assert(phi->in(old_path) == old_slice, "pre-existing phis OK"); 2247 #endif 2248 mms.set_memory(phi); 2249 } else { 2250 phi = PhiNode::make(region, old_slice, Type::MEMORY, mms.adr_type(C)); 2251 _gvn.set_type(phi, Type::MEMORY); 2252 phi->set_req(new_path, new_slice); 2253 mms.set_memory(_gvn.transform(phi)); // assume it is complete 2254 } 2255 } 2256 } 2257 } 2258 2259 //------------------------------make_slow_call_ex------------------------------ 2260 // Make the exception handler hookups for the slow call 2261 void GraphKit::make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj) { 2262 if (stopped()) return; 2263 2264 // Make a catch node with just two handlers: fall-through and catch-all 2265 Node* i_o = _gvn.transform( new (C) ProjNode(call, TypeFunc::I_O, separate_io_proj) ); 2266 Node* catc = _gvn.transform( new (C) CatchNode(control(), i_o, 2) ); 2267 Node* norm = _gvn.transform( new (C) CatchProjNode(catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci) ); 2268 Node* excp = _gvn.transform( new (C) CatchProjNode(catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci) ); 2269 2270 { PreserveJVMState pjvms(this); 2271 set_control(excp); 2272 set_i_o(i_o); 2273 2274 if (excp != top()) { 2275 // Create an exception state also. 2276 // Use an exact type if the caller has specified a specific exception. 2277 const Type* ex_type = TypeOopPtr::make_from_klass_unique(ex_klass)->cast_to_ptr_type(TypePtr::NotNull); 2278 Node* ex_oop = new (C) CreateExNode(ex_type, control(), i_o); 2279 add_exception_state(make_exception_state(_gvn.transform(ex_oop))); 2280 } 2281 } 2282 2283 // Get the no-exception control from the CatchNode. 2284 set_control(norm); 2285 } 2286 2287 2288 //-------------------------------gen_subtype_check----------------------------- 2289 // Generate a subtyping check. Takes as input the subtype and supertype. 2290 // Returns 2 values: sets the default control() to the true path and returns 2291 // the false path. Only reads invariant memory; sets no (visible) memory. 2292 // The PartialSubtypeCheckNode sets the hidden 1-word cache in the encoding 2293 // but that's not exposed to the optimizer. This call also doesn't take in an 2294 // Object; if you wish to check an Object you need to load the Object's class 2295 // prior to coming here. 2296 Node* GraphKit::gen_subtype_check(Node* subklass, Node* superklass) { 2297 // Fast check for identical types, perhaps identical constants. 2298 // The types can even be identical non-constants, in cases 2299 // involving Array.newInstance, Object.clone, etc. 2300 if (subklass == superklass) 2301 return top(); // false path is dead; no test needed. 2302 2303 if (_gvn.type(superklass)->singleton()) { 2304 ciKlass* superk = _gvn.type(superklass)->is_klassptr()->klass(); 2305 ciKlass* subk = _gvn.type(subklass)->is_klassptr()->klass(); 2306 2307 // In the common case of an exact superklass, try to fold up the 2308 // test before generating code. You may ask, why not just generate 2309 // the code and then let it fold up? The answer is that the generated 2310 // code will necessarily include null checks, which do not always 2311 // completely fold away. If they are also needless, then they turn 2312 // into a performance loss. Example: 2313 // Foo[] fa = blah(); Foo x = fa[0]; fa[1] = x; 2314 // Here, the type of 'fa' is often exact, so the store check 2315 // of fa[1]=x will fold up, without testing the nullness of x. 2316 switch (static_subtype_check(superk, subk)) { 2317 case SSC_always_false: 2318 { 2319 Node* always_fail = control(); 2320 set_control(top()); 2321 return always_fail; 2322 } 2323 case SSC_always_true: 2324 return top(); 2325 case SSC_easy_test: 2326 { 2327 // Just do a direct pointer compare and be done. 2328 Node* cmp = _gvn.transform( new(C) CmpPNode(subklass, superklass) ); 2329 Node* bol = _gvn.transform( new(C) BoolNode(cmp, BoolTest::eq) ); 2330 IfNode* iff = create_and_xform_if(control(), bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); 2331 set_control( _gvn.transform( new(C) IfTrueNode (iff) ) ); 2332 return _gvn.transform( new(C) IfFalseNode(iff) ); 2333 } 2334 case SSC_full_test: 2335 break; 2336 default: 2337 ShouldNotReachHere(); 2338 } 2339 } 2340 2341 // %%% Possible further optimization: Even if the superklass is not exact, 2342 // if the subklass is the unique subtype of the superklass, the check 2343 // will always succeed. We could leave a dependency behind to ensure this. 2344 2345 // First load the super-klass's check-offset 2346 Node *p1 = basic_plus_adr( superklass, superklass, in_bytes(Klass::super_check_offset_offset()) ); 2347 Node *chk_off = _gvn.transform( new (C) LoadINode( NULL, memory(p1), p1, _gvn.type(p1)->is_ptr() ) ); 2348 int cacheoff_con = in_bytes(Klass::secondary_super_cache_offset()); 2349 bool might_be_cache = (find_int_con(chk_off, cacheoff_con) == cacheoff_con); 2350 2351 // Load from the sub-klass's super-class display list, or a 1-word cache of 2352 // the secondary superclass list, or a failing value with a sentinel offset 2353 // if the super-klass is an interface or exceptionally deep in the Java 2354 // hierarchy and we have to scan the secondary superclass list the hard way. 2355 // Worst-case type is a little odd: NULL is allowed as a result (usually 2356 // klass loads can never produce a NULL). 2357 Node *chk_off_X = ConvI2X(chk_off); 2358 Node *p2 = _gvn.transform( new (C) AddPNode(subklass,subklass,chk_off_X) ); 2359 // For some types like interfaces the following loadKlass is from a 1-word 2360 // cache which is mutable so can't use immutable memory. Other 2361 // types load from the super-class display table which is immutable. 2362 Node *kmem = might_be_cache ? memory(p2) : immutable_memory(); 2363 Node *nkls = _gvn.transform( LoadKlassNode::make( _gvn, kmem, p2, _gvn.type(p2)->is_ptr(), TypeKlassPtr::OBJECT_OR_NULL ) ); 2364 2365 // Compile speed common case: ARE a subtype and we canNOT fail 2366 if( superklass == nkls ) 2367 return top(); // false path is dead; no test needed. 2368 2369 // See if we get an immediate positive hit. Happens roughly 83% of the 2370 // time. Test to see if the value loaded just previously from the subklass 2371 // is exactly the superklass. 2372 Node *cmp1 = _gvn.transform( new (C) CmpPNode( superklass, nkls ) ); 2373 Node *bol1 = _gvn.transform( new (C) BoolNode( cmp1, BoolTest::eq ) ); 2374 IfNode *iff1 = create_and_xform_if( control(), bol1, PROB_LIKELY(0.83f), COUNT_UNKNOWN ); 2375 Node *iftrue1 = _gvn.transform( new (C) IfTrueNode ( iff1 ) ); 2376 set_control( _gvn.transform( new (C) IfFalseNode( iff1 ) ) ); 2377 2378 // Compile speed common case: Check for being deterministic right now. If 2379 // chk_off is a constant and not equal to cacheoff then we are NOT a 2380 // subklass. In this case we need exactly the 1 test above and we can 2381 // return those results immediately. 2382 if (!might_be_cache) { 2383 Node* not_subtype_ctrl = control(); 2384 set_control(iftrue1); // We need exactly the 1 test above 2385 return not_subtype_ctrl; 2386 } 2387 2388 // Gather the various success & failures here 2389 RegionNode *r_ok_subtype = new (C) RegionNode(4); 2390 record_for_igvn(r_ok_subtype); 2391 RegionNode *r_not_subtype = new (C) RegionNode(3); 2392 record_for_igvn(r_not_subtype); 2393 2394 r_ok_subtype->init_req(1, iftrue1); 2395 2396 // Check for immediate negative hit. Happens roughly 11% of the time (which 2397 // is roughly 63% of the remaining cases). Test to see if the loaded 2398 // check-offset points into the subklass display list or the 1-element 2399 // cache. If it points to the display (and NOT the cache) and the display 2400 // missed then it's not a subtype. 2401 Node *cacheoff = _gvn.intcon(cacheoff_con); 2402 Node *cmp2 = _gvn.transform( new (C) CmpINode( chk_off, cacheoff ) ); 2403 Node *bol2 = _gvn.transform( new (C) BoolNode( cmp2, BoolTest::ne ) ); 2404 IfNode *iff2 = create_and_xform_if( control(), bol2, PROB_LIKELY(0.63f), COUNT_UNKNOWN ); 2405 r_not_subtype->init_req(1, _gvn.transform( new (C) IfTrueNode (iff2) ) ); 2406 set_control( _gvn.transform( new (C) IfFalseNode(iff2) ) ); 2407 2408 // Check for self. Very rare to get here, but it is taken 1/3 the time. 2409 // No performance impact (too rare) but allows sharing of secondary arrays 2410 // which has some footprint reduction. 2411 Node *cmp3 = _gvn.transform( new (C) CmpPNode( subklass, superklass ) ); 2412 Node *bol3 = _gvn.transform( new (C) BoolNode( cmp3, BoolTest::eq ) ); 2413 IfNode *iff3 = create_and_xform_if( control(), bol3, PROB_LIKELY(0.36f), COUNT_UNKNOWN ); 2414 r_ok_subtype->init_req(2, _gvn.transform( new (C) IfTrueNode ( iff3 ) ) ); 2415 set_control( _gvn.transform( new (C) IfFalseNode( iff3 ) ) ); 2416 2417 // -- Roads not taken here: -- 2418 // We could also have chosen to perform the self-check at the beginning 2419 // of this code sequence, as the assembler does. This would not pay off 2420 // the same way, since the optimizer, unlike the assembler, can perform 2421 // static type analysis to fold away many successful self-checks. 2422 // Non-foldable self checks work better here in second position, because 2423 // the initial primary superclass check subsumes a self-check for most 2424 // types. An exception would be a secondary type like array-of-interface, 2425 // which does not appear in its own primary supertype display. 2426 // Finally, we could have chosen to move the self-check into the 2427 // PartialSubtypeCheckNode, and from there out-of-line in a platform 2428 // dependent manner. But it is worthwhile to have the check here, 2429 // where it can be perhaps be optimized. The cost in code space is 2430 // small (register compare, branch). 2431 2432 // Now do a linear scan of the secondary super-klass array. Again, no real 2433 // performance impact (too rare) but it's gotta be done. 2434 // Since the code is rarely used, there is no penalty for moving it 2435 // out of line, and it can only improve I-cache density. 2436 // The decision to inline or out-of-line this final check is platform 2437 // dependent, and is found in the AD file definition of PartialSubtypeCheck. 2438 Node* psc = _gvn.transform( 2439 new (C) PartialSubtypeCheckNode(control(), subklass, superklass) ); 2440 2441 Node *cmp4 = _gvn.transform( new (C) CmpPNode( psc, null() ) ); 2442 Node *bol4 = _gvn.transform( new (C) BoolNode( cmp4, BoolTest::ne ) ); 2443 IfNode *iff4 = create_and_xform_if( control(), bol4, PROB_FAIR, COUNT_UNKNOWN ); 2444 r_not_subtype->init_req(2, _gvn.transform( new (C) IfTrueNode (iff4) ) ); 2445 r_ok_subtype ->init_req(3, _gvn.transform( new (C) IfFalseNode(iff4) ) ); 2446 2447 // Return false path; set default control to true path. 2448 set_control( _gvn.transform(r_ok_subtype) ); 2449 return _gvn.transform(r_not_subtype); 2450 } 2451 2452 //----------------------------static_subtype_check----------------------------- 2453 // Shortcut important common cases when superklass is exact: 2454 // (0) superklass is java.lang.Object (can occur in reflective code) 2455 // (1) subklass is already limited to a subtype of superklass => always ok 2456 // (2) subklass does not overlap with superklass => always fail 2457 // (3) superklass has NO subtypes and we can check with a simple compare. 2458 int GraphKit::static_subtype_check(ciKlass* superk, ciKlass* subk) { 2459 if (StressReflectiveCode) { 2460 return SSC_full_test; // Let caller generate the general case. 2461 } 2462 2463 if (superk == env()->Object_klass()) { 2464 return SSC_always_true; // (0) this test cannot fail 2465 } 2466 2467 ciType* superelem = superk; 2468 if (superelem->is_array_klass()) 2469 superelem = superelem->as_array_klass()->base_element_type(); 2470 2471 if (!subk->is_interface()) { // cannot trust static interface types yet 2472 if (subk->is_subtype_of(superk)) { 2473 return SSC_always_true; // (1) false path dead; no dynamic test needed 2474 } 2475 if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) && 2476 !superk->is_subtype_of(subk)) { 2477 return SSC_always_false; 2478 } 2479 } 2480 2481 // If casting to an instance klass, it must have no subtypes 2482 if (superk->is_interface()) { 2483 // Cannot trust interfaces yet. 2484 // %%% S.B. superk->nof_implementors() == 1 2485 } else if (superelem->is_instance_klass()) { 2486 ciInstanceKlass* ik = superelem->as_instance_klass(); 2487 if (!ik->has_subklass() && !ik->is_interface()) { 2488 if (!ik->is_final()) { 2489 // Add a dependency if there is a chance of a later subclass. 2490 C->dependencies()->assert_leaf_type(ik); 2491 } 2492 return SSC_easy_test; // (3) caller can do a simple ptr comparison 2493 } 2494 } else { 2495 // A primitive array type has no subtypes. 2496 return SSC_easy_test; // (3) caller can do a simple ptr comparison 2497 } 2498 2499 return SSC_full_test; 2500 } 2501 2502 // Profile-driven exact type check: 2503 Node* GraphKit::type_check_receiver(Node* receiver, ciKlass* klass, 2504 float prob, 2505 Node* *casted_receiver) { 2506 const TypeKlassPtr* tklass = TypeKlassPtr::make(klass); 2507 Node* recv_klass = load_object_klass(receiver); 2508 Node* want_klass = makecon(tklass); 2509 Node* cmp = _gvn.transform( new(C) CmpPNode(recv_klass, want_klass) ); 2510 Node* bol = _gvn.transform( new(C) BoolNode(cmp, BoolTest::eq) ); 2511 IfNode* iff = create_and_xform_if(control(), bol, prob, COUNT_UNKNOWN); 2512 set_control( _gvn.transform( new(C) IfTrueNode (iff) )); 2513 Node* fail = _gvn.transform( new(C) IfFalseNode(iff) ); 2514 2515 const TypeOopPtr* recv_xtype = tklass->as_instance_type(); 2516 assert(recv_xtype->klass_is_exact(), ""); 2517 2518 // Subsume downstream occurrences of receiver with a cast to 2519 // recv_xtype, since now we know what the type will be. 2520 Node* cast = new(C) CheckCastPPNode(control(), receiver, recv_xtype); 2521 (*casted_receiver) = _gvn.transform(cast); 2522 // (User must make the replace_in_map call.) 2523 2524 return fail; 2525 } 2526 2527 2528 //------------------------------seems_never_null------------------------------- 2529 // Use null_seen information if it is available from the profile. 2530 // If we see an unexpected null at a type check we record it and force a 2531 // recompile; the offending check will be recompiled to handle NULLs. 2532 // If we see several offending BCIs, then all checks in the 2533 // method will be recompiled. 2534 bool GraphKit::seems_never_null(Node* obj, ciProfileData* data) { 2535 if (UncommonNullCast // Cutout for this technique 2536 && obj != null() // And not the -Xcomp stupid case? 2537 && !too_many_traps(Deoptimization::Reason_null_check) 2538 ) { 2539 if (data == NULL) 2540 // Edge case: no mature data. Be optimistic here. 2541 return true; 2542 // If the profile has not seen a null, assume it won't happen. 2543 assert(java_bc() == Bytecodes::_checkcast || 2544 java_bc() == Bytecodes::_instanceof || 2545 java_bc() == Bytecodes::_aastore, "MDO must collect null_seen bit here"); 2546 return !data->as_BitData()->null_seen(); 2547 } 2548 return false; 2549 } 2550 2551 //------------------------maybe_cast_profiled_receiver------------------------- 2552 // If the profile has seen exactly one type, narrow to exactly that type. 2553 // Subsequent type checks will always fold up. 2554 Node* GraphKit::maybe_cast_profiled_receiver(Node* not_null_obj, 2555 ciProfileData* data, 2556 ciKlass* require_klass) { 2557 if (!UseTypeProfile || !TypeProfileCasts) return NULL; 2558 if (data == NULL) return NULL; 2559 2560 // Make sure we haven't already deoptimized from this tactic. 2561 if (too_many_traps(Deoptimization::Reason_class_check)) 2562 return NULL; 2563 2564 // (No, this isn't a call, but it's enough like a virtual call 2565 // to use the same ciMethod accessor to get the profile info...) 2566 ciCallProfile profile = method()->call_profile_at_bci(bci()); 2567 if (profile.count() >= 0 && // no cast failures here 2568 profile.has_receiver(0) && 2569 profile.morphism() == 1) { 2570 ciKlass* exact_kls = profile.receiver(0); 2571 if (require_klass == NULL || 2572 static_subtype_check(require_klass, exact_kls) == SSC_always_true) { 2573 // If we narrow the type to match what the type profile sees, 2574 // we can then remove the rest of the cast. 2575 // This is a win, even if the exact_kls is very specific, 2576 // because downstream operations, such as method calls, 2577 // will often benefit from the sharper type. 2578 Node* exact_obj = not_null_obj; // will get updated in place... 2579 Node* slow_ctl = type_check_receiver(exact_obj, exact_kls, 1.0, 2580 &exact_obj); 2581 { PreserveJVMState pjvms(this); 2582 set_control(slow_ctl); 2583 uncommon_trap(Deoptimization::Reason_class_check, 2584 Deoptimization::Action_maybe_recompile); 2585 } 2586 replace_in_map(not_null_obj, exact_obj); 2587 return exact_obj; 2588 } 2589 // assert(ssc == SSC_always_true)... except maybe the profile lied to us. 2590 } 2591 2592 return NULL; 2593 } 2594 2595 2596 //-------------------------------gen_instanceof-------------------------------- 2597 // Generate an instance-of idiom. Used by both the instance-of bytecode 2598 // and the reflective instance-of call. 2599 Node* GraphKit::gen_instanceof(Node* obj, Node* superklass) { 2600 kill_dead_locals(); // Benefit all the uncommon traps 2601 assert( !stopped(), "dead parse path should be checked in callers" ); 2602 assert(!TypePtr::NULL_PTR->higher_equal(_gvn.type(superklass)->is_klassptr()), 2603 "must check for not-null not-dead klass in callers"); 2604 2605 // Make the merge point 2606 enum { _obj_path = 1, _fail_path, _null_path, PATH_LIMIT }; 2607 RegionNode* region = new(C) RegionNode(PATH_LIMIT); 2608 Node* phi = new(C) PhiNode(region, TypeInt::BOOL); 2609 C->set_has_split_ifs(true); // Has chance for split-if optimization 2610 2611 ciProfileData* data = NULL; 2612 if (java_bc() == Bytecodes::_instanceof) { // Only for the bytecode 2613 data = method()->method_data()->bci_to_data(bci()); 2614 } 2615 bool never_see_null = (ProfileDynamicTypes // aggressive use of profile 2616 && seems_never_null(obj, data)); 2617 2618 // Null check; get casted pointer; set region slot 3 2619 Node* null_ctl = top(); 2620 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); 2621 2622 // If not_null_obj is dead, only null-path is taken 2623 if (stopped()) { // Doing instance-of on a NULL? 2624 set_control(null_ctl); 2625 return intcon(0); 2626 } 2627 region->init_req(_null_path, null_ctl); 2628 phi ->init_req(_null_path, intcon(0)); // Set null path value 2629 if (null_ctl == top()) { 2630 // Do this eagerly, so that pattern matches like is_diamond_phi 2631 // will work even during parsing. 2632 assert(_null_path == PATH_LIMIT-1, "delete last"); 2633 region->del_req(_null_path); 2634 phi ->del_req(_null_path); 2635 } 2636 2637 if (ProfileDynamicTypes && data != NULL) { 2638 Node* cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, NULL); 2639 if (stopped()) { // Profile disagrees with this path. 2640 set_control(null_ctl); // Null is the only remaining possibility. 2641 return intcon(0); 2642 } 2643 if (cast_obj != NULL) 2644 not_null_obj = cast_obj; 2645 } 2646 2647 // Load the object's klass 2648 Node* obj_klass = load_object_klass(not_null_obj); 2649 2650 // Generate the subtype check 2651 Node* not_subtype_ctrl = gen_subtype_check(obj_klass, superklass); 2652 2653 // Plug in the success path to the general merge in slot 1. 2654 region->init_req(_obj_path, control()); 2655 phi ->init_req(_obj_path, intcon(1)); 2656 2657 // Plug in the failing path to the general merge in slot 2. 2658 region->init_req(_fail_path, not_subtype_ctrl); 2659 phi ->init_req(_fail_path, intcon(0)); 2660 2661 // Return final merged results 2662 set_control( _gvn.transform(region) ); 2663 record_for_igvn(region); 2664 return _gvn.transform(phi); 2665 } 2666 2667 //-------------------------------gen_checkcast--------------------------------- 2668 // Generate a checkcast idiom. Used by both the checkcast bytecode and the 2669 // array store bytecode. Stack must be as-if BEFORE doing the bytecode so the 2670 // uncommon-trap paths work. Adjust stack after this call. 2671 // If failure_control is supplied and not null, it is filled in with 2672 // the control edge for the cast failure. Otherwise, an appropriate 2673 // uncommon trap or exception is thrown. 2674 Node* GraphKit::gen_checkcast(Node *obj, Node* superklass, 2675 Node* *failure_control) { 2676 kill_dead_locals(); // Benefit all the uncommon traps 2677 const TypeKlassPtr *tk = _gvn.type(superklass)->is_klassptr(); 2678 const Type *toop = TypeOopPtr::make_from_klass(tk->klass()); 2679 2680 // Fast cutout: Check the case that the cast is vacuously true. 2681 // This detects the common cases where the test will short-circuit 2682 // away completely. We do this before we perform the null check, 2683 // because if the test is going to turn into zero code, we don't 2684 // want a residual null check left around. (Causes a slowdown, 2685 // for example, in some objArray manipulations, such as a[i]=a[j].) 2686 if (tk->singleton()) { 2687 const TypeOopPtr* objtp = _gvn.type(obj)->isa_oopptr(); 2688 if (objtp != NULL && objtp->klass() != NULL) { 2689 switch (static_subtype_check(tk->klass(), objtp->klass())) { 2690 case SSC_always_true: 2691 return obj; 2692 case SSC_always_false: 2693 // It needs a null check because a null will *pass* the cast check. 2694 // A non-null value will always produce an exception. 2695 return null_assert(obj); 2696 } 2697 } 2698 } 2699 2700 ciProfileData* data = NULL; 2701 if (failure_control == NULL) { // use MDO in regular case only 2702 assert(java_bc() == Bytecodes::_aastore || 2703 java_bc() == Bytecodes::_checkcast, 2704 "interpreter profiles type checks only for these BCs"); 2705 data = method()->method_data()->bci_to_data(bci()); 2706 } 2707 2708 // Make the merge point 2709 enum { _obj_path = 1, _null_path, PATH_LIMIT }; 2710 RegionNode* region = new (C) RegionNode(PATH_LIMIT); 2711 Node* phi = new (C) PhiNode(region, toop); 2712 C->set_has_split_ifs(true); // Has chance for split-if optimization 2713 2714 // Use null-cast information if it is available 2715 bool never_see_null = ((failure_control == NULL) // regular case only 2716 && seems_never_null(obj, data)); 2717 2718 // Null check; get casted pointer; set region slot 3 2719 Node* null_ctl = top(); 2720 Node* not_null_obj = null_check_oop(obj, &null_ctl, never_see_null); 2721 2722 // If not_null_obj is dead, only null-path is taken 2723 if (stopped()) { // Doing instance-of on a NULL? 2724 set_control(null_ctl); 2725 return null(); 2726 } 2727 region->init_req(_null_path, null_ctl); 2728 phi ->init_req(_null_path, null()); // Set null path value 2729 if (null_ctl == top()) { 2730 // Do this eagerly, so that pattern matches like is_diamond_phi 2731 // will work even during parsing. 2732 assert(_null_path == PATH_LIMIT-1, "delete last"); 2733 region->del_req(_null_path); 2734 phi ->del_req(_null_path); 2735 } 2736 2737 Node* cast_obj = NULL; 2738 if (data != NULL && 2739 // Counter has never been decremented (due to cast failure). 2740 // ...This is a reasonable thing to expect. It is true of 2741 // all casts inserted by javac to implement generic types. 2742 data->as_CounterData()->count() >= 0) { 2743 cast_obj = maybe_cast_profiled_receiver(not_null_obj, data, tk->klass()); 2744 if (cast_obj != NULL) { 2745 if (failure_control != NULL) // failure is now impossible 2746 (*failure_control) = top(); 2747 // adjust the type of the phi to the exact klass: 2748 phi->raise_bottom_type(_gvn.type(cast_obj)->meet(TypePtr::NULL_PTR)); 2749 } 2750 } 2751 2752 if (cast_obj == NULL) { 2753 // Load the object's klass 2754 Node* obj_klass = load_object_klass(not_null_obj); 2755 2756 // Generate the subtype check 2757 Node* not_subtype_ctrl = gen_subtype_check( obj_klass, superklass ); 2758 2759 // Plug in success path into the merge 2760 cast_obj = _gvn.transform(new (C) CheckCastPPNode(control(), 2761 not_null_obj, toop)); 2762 // Failure path ends in uncommon trap (or may be dead - failure impossible) 2763 if (failure_control == NULL) { 2764 if (not_subtype_ctrl != top()) { // If failure is possible 2765 PreserveJVMState pjvms(this); 2766 set_control(not_subtype_ctrl); 2767 builtin_throw(Deoptimization::Reason_class_check, obj_klass); 2768 } 2769 } else { 2770 (*failure_control) = not_subtype_ctrl; 2771 } 2772 } 2773 2774 region->init_req(_obj_path, control()); 2775 phi ->init_req(_obj_path, cast_obj); 2776 2777 // A merge of NULL or Casted-NotNull obj 2778 Node* res = _gvn.transform(phi); 2779 2780 // Note I do NOT always 'replace_in_map(obj,result)' here. 2781 // if( tk->klass()->can_be_primary_super() ) 2782 // This means that if I successfully store an Object into an array-of-String 2783 // I 'forget' that the Object is really now known to be a String. I have to 2784 // do this because we don't have true union types for interfaces - if I store 2785 // a Baz into an array-of-Interface and then tell the optimizer it's an 2786 // Interface, I forget that it's also a Baz and cannot do Baz-like field 2787 // references to it. FIX THIS WHEN UNION TYPES APPEAR! 2788 // replace_in_map( obj, res ); 2789 2790 // Return final merged results 2791 set_control( _gvn.transform(region) ); 2792 record_for_igvn(region); 2793 return res; 2794 } 2795 2796 //------------------------------next_monitor----------------------------------- 2797 // What number should be given to the next monitor? 2798 int GraphKit::next_monitor() { 2799 int current = jvms()->monitor_depth()* C->sync_stack_slots(); 2800 int next = current + C->sync_stack_slots(); 2801 // Keep the toplevel high water mark current: 2802 if (C->fixed_slots() < next) C->set_fixed_slots(next); 2803 return current; 2804 } 2805 2806 //------------------------------insert_mem_bar--------------------------------- 2807 // Memory barrier to avoid floating things around 2808 // The membar serves as a pinch point between both control and all memory slices. 2809 Node* GraphKit::insert_mem_bar(int opcode, Node* precedent) { 2810 MemBarNode* mb = MemBarNode::make(C, opcode, Compile::AliasIdxBot, precedent); 2811 mb->init_req(TypeFunc::Control, control()); 2812 mb->init_req(TypeFunc::Memory, reset_memory()); 2813 Node* membar = _gvn.transform(mb); 2814 set_control(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Control))); 2815 set_all_memory_call(membar); 2816 return membar; 2817 } 2818 2819 //-------------------------insert_mem_bar_volatile---------------------------- 2820 // Memory barrier to avoid floating things around 2821 // The membar serves as a pinch point between both control and memory(alias_idx). 2822 // If you want to make a pinch point on all memory slices, do not use this 2823 // function (even with AliasIdxBot); use insert_mem_bar() instead. 2824 Node* GraphKit::insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent) { 2825 // When Parse::do_put_xxx updates a volatile field, it appends a series 2826 // of MemBarVolatile nodes, one for *each* volatile field alias category. 2827 // The first membar is on the same memory slice as the field store opcode. 2828 // This forces the membar to follow the store. (Bug 6500685 broke this.) 2829 // All the other membars (for other volatile slices, including AliasIdxBot, 2830 // which stands for all unknown volatile slices) are control-dependent 2831 // on the first membar. This prevents later volatile loads or stores 2832 // from sliding up past the just-emitted store. 2833 2834 MemBarNode* mb = MemBarNode::make(C, opcode, alias_idx, precedent); 2835 mb->set_req(TypeFunc::Control,control()); 2836 if (alias_idx == Compile::AliasIdxBot) { 2837 mb->set_req(TypeFunc::Memory, merged_memory()->base_memory()); 2838 } else { 2839 assert(!(opcode == Op_Initialize && alias_idx != Compile::AliasIdxRaw), "fix caller"); 2840 mb->set_req(TypeFunc::Memory, memory(alias_idx)); 2841 } 2842 Node* membar = _gvn.transform(mb); 2843 set_control(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Control))); 2844 if (alias_idx == Compile::AliasIdxBot) { 2845 merged_memory()->set_base_memory(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Memory))); 2846 } else { 2847 set_memory(_gvn.transform(new (C) ProjNode(membar, TypeFunc::Memory)),alias_idx); 2848 } 2849 return membar; 2850 } 2851 2852 //------------------------------shared_lock------------------------------------ 2853 // Emit locking code. 2854 FastLockNode* GraphKit::shared_lock(Node* obj) { 2855 // bci is either a monitorenter bc or InvocationEntryBci 2856 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces 2857 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); 2858 2859 if( !GenerateSynchronizationCode ) 2860 return NULL; // Not locking things? 2861 if (stopped()) // Dead monitor? 2862 return NULL; 2863 2864 assert(dead_locals_are_killed(), "should kill locals before sync. point"); 2865 2866 // Box the stack location 2867 Node* box = _gvn.transform(new (C) BoxLockNode(next_monitor())); 2868 Node* mem = reset_memory(); 2869 2870 FastLockNode * flock = _gvn.transform(new (C) FastLockNode(0, obj, box) )->as_FastLock(); 2871 if (PrintPreciseBiasedLockingStatistics) { 2872 // Create the counters for this fast lock. 2873 flock->create_lock_counter(sync_jvms()); // sync_jvms used to get current bci 2874 } 2875 // Add monitor to debug info for the slow path. If we block inside the 2876 // slow path and de-opt, we need the monitor hanging around 2877 map()->push_monitor( flock ); 2878 2879 const TypeFunc *tf = LockNode::lock_type(); 2880 LockNode *lock = new (C) LockNode(C, tf); 2881 2882 lock->init_req( TypeFunc::Control, control() ); 2883 lock->init_req( TypeFunc::Memory , mem ); 2884 lock->init_req( TypeFunc::I_O , top() ) ; // does no i/o 2885 lock->init_req( TypeFunc::FramePtr, frameptr() ); 2886 lock->init_req( TypeFunc::ReturnAdr, top() ); 2887 2888 lock->init_req(TypeFunc::Parms + 0, obj); 2889 lock->init_req(TypeFunc::Parms + 1, box); 2890 lock->init_req(TypeFunc::Parms + 2, flock); 2891 add_safepoint_edges(lock); 2892 2893 lock = _gvn.transform( lock )->as_Lock(); 2894 2895 // lock has no side-effects, sets few values 2896 set_predefined_output_for_runtime_call(lock, mem, TypeRawPtr::BOTTOM); 2897 2898 insert_mem_bar(Op_MemBarAcquireLock); 2899 2900 // Add this to the worklist so that the lock can be eliminated 2901 record_for_igvn(lock); 2902 2903 #ifndef PRODUCT 2904 if (PrintLockStatistics) { 2905 // Update the counter for this lock. Don't bother using an atomic 2906 // operation since we don't require absolute accuracy. 2907 lock->create_lock_counter(map()->jvms()); 2908 increment_counter(lock->counter()->addr()); 2909 } 2910 #endif 2911 2912 return flock; 2913 } 2914 2915 2916 //------------------------------shared_unlock---------------------------------- 2917 // Emit unlocking code. 2918 void GraphKit::shared_unlock(Node* box, Node* obj) { 2919 // bci is either a monitorenter bc or InvocationEntryBci 2920 // %%% SynchronizationEntryBCI is redundant; use InvocationEntryBci in interfaces 2921 assert(SynchronizationEntryBCI == InvocationEntryBci, ""); 2922 2923 if( !GenerateSynchronizationCode ) 2924 return; 2925 if (stopped()) { // Dead monitor? 2926 map()->pop_monitor(); // Kill monitor from debug info 2927 return; 2928 } 2929 2930 // Memory barrier to avoid floating things down past the locked region 2931 insert_mem_bar(Op_MemBarReleaseLock); 2932 2933 const TypeFunc *tf = OptoRuntime::complete_monitor_exit_Type(); 2934 UnlockNode *unlock = new (C) UnlockNode(C, tf); 2935 uint raw_idx = Compile::AliasIdxRaw; 2936 unlock->init_req( TypeFunc::Control, control() ); 2937 unlock->init_req( TypeFunc::Memory , memory(raw_idx) ); 2938 unlock->init_req( TypeFunc::I_O , top() ) ; // does no i/o 2939 unlock->init_req( TypeFunc::FramePtr, frameptr() ); 2940 unlock->init_req( TypeFunc::ReturnAdr, top() ); 2941 2942 unlock->init_req(TypeFunc::Parms + 0, obj); 2943 unlock->init_req(TypeFunc::Parms + 1, box); 2944 unlock = _gvn.transform(unlock)->as_Unlock(); 2945 2946 Node* mem = reset_memory(); 2947 2948 // unlock has no side-effects, sets few values 2949 set_predefined_output_for_runtime_call(unlock, mem, TypeRawPtr::BOTTOM); 2950 2951 // Kill monitor from debug info 2952 map()->pop_monitor( ); 2953 } 2954 2955 //-------------------------------get_layout_helper----------------------------- 2956 // If the given klass is a constant or known to be an array, 2957 // fetch the constant layout helper value into constant_value 2958 // and return (Node*)NULL. Otherwise, load the non-constant 2959 // layout helper value, and return the node which represents it. 2960 // This two-faced routine is useful because allocation sites 2961 // almost always feature constant types. 2962 Node* GraphKit::get_layout_helper(Node* klass_node, jint& constant_value) { 2963 const TypeKlassPtr* inst_klass = _gvn.type(klass_node)->isa_klassptr(); 2964 if (!StressReflectiveCode && inst_klass != NULL) { 2965 ciKlass* klass = inst_klass->klass(); 2966 bool xklass = inst_klass->klass_is_exact(); 2967 if (xklass || klass->is_array_klass()) { 2968 jint lhelper = klass->layout_helper(); 2969 if (lhelper != Klass::_lh_neutral_value) { 2970 constant_value = lhelper; 2971 return (Node*) NULL; 2972 } 2973 } 2974 } 2975 constant_value = Klass::_lh_neutral_value; // put in a known value 2976 Node* lhp = basic_plus_adr(klass_node, klass_node, in_bytes(Klass::layout_helper_offset())); 2977 return make_load(NULL, lhp, TypeInt::INT, T_INT); 2978 } 2979 2980 // We just put in an allocate/initialize with a big raw-memory effect. 2981 // Hook selected additional alias categories on the initialization. 2982 static void hook_memory_on_init(GraphKit& kit, int alias_idx, 2983 MergeMemNode* init_in_merge, 2984 Node* init_out_raw) { 2985 DEBUG_ONLY(Node* init_in_raw = init_in_merge->base_memory()); 2986 assert(init_in_merge->memory_at(alias_idx) == init_in_raw, ""); 2987 2988 Node* prevmem = kit.memory(alias_idx); 2989 init_in_merge->set_memory_at(alias_idx, prevmem); 2990 kit.set_memory(init_out_raw, alias_idx); 2991 } 2992 2993 //---------------------------set_output_for_allocation------------------------- 2994 Node* GraphKit::set_output_for_allocation(AllocateNode* alloc, 2995 const TypeOopPtr* oop_type) { 2996 int rawidx = Compile::AliasIdxRaw; 2997 alloc->set_req( TypeFunc::FramePtr, frameptr() ); 2998 add_safepoint_edges(alloc); 2999 Node* allocx = _gvn.transform(alloc); 3000 set_control( _gvn.transform(new (C) ProjNode(allocx, TypeFunc::Control) ) ); 3001 // create memory projection for i_o 3002 set_memory ( _gvn.transform( new (C) ProjNode(allocx, TypeFunc::Memory, true) ), rawidx ); 3003 make_slow_call_ex(allocx, env()->Throwable_klass(), true); 3004 3005 // create a memory projection as for the normal control path 3006 Node* malloc = _gvn.transform(new (C) ProjNode(allocx, TypeFunc::Memory)); 3007 set_memory(malloc, rawidx); 3008 3009 // a normal slow-call doesn't change i_o, but an allocation does 3010 // we create a separate i_o projection for the normal control path 3011 set_i_o(_gvn.transform( new (C) ProjNode(allocx, TypeFunc::I_O, false) ) ); 3012 Node* rawoop = _gvn.transform( new (C) ProjNode(allocx, TypeFunc::Parms) ); 3013 3014 // put in an initialization barrier 3015 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, rawidx, 3016 rawoop)->as_Initialize(); 3017 assert(alloc->initialization() == init, "2-way macro link must work"); 3018 assert(init ->allocation() == alloc, "2-way macro link must work"); 3019 { 3020 // Extract memory strands which may participate in the new object's 3021 // initialization, and source them from the new InitializeNode. 3022 // This will allow us to observe initializations when they occur, 3023 // and link them properly (as a group) to the InitializeNode. 3024 assert(init->in(InitializeNode::Memory) == malloc, ""); 3025 MergeMemNode* minit_in = MergeMemNode::make(C, malloc); 3026 init->set_req(InitializeNode::Memory, minit_in); 3027 record_for_igvn(minit_in); // fold it up later, if possible 3028 Node* minit_out = memory(rawidx); 3029 assert(minit_out->is_Proj() && minit_out->in(0) == init, ""); 3030 if (oop_type->isa_aryptr()) { 3031 const TypePtr* telemref = oop_type->add_offset(Type::OffsetBot); 3032 int elemidx = C->get_alias_index(telemref); 3033 hook_memory_on_init(*this, elemidx, minit_in, minit_out); 3034 } else if (oop_type->isa_instptr()) { 3035 ciInstanceKlass* ik = oop_type->klass()->as_instance_klass(); 3036 for (int i = 0, len = ik->nof_nonstatic_fields(); i < len; i++) { 3037 ciField* field = ik->nonstatic_field_at(i); 3038 if (field->offset() >= TrackedInitializationLimit * HeapWordSize) 3039 continue; // do not bother to track really large numbers of fields 3040 // Find (or create) the alias category for this field: 3041 int fieldidx = C->alias_type(field)->index(); 3042 hook_memory_on_init(*this, fieldidx, minit_in, minit_out); 3043 } 3044 } 3045 } 3046 3047 // Cast raw oop to the real thing... 3048 Node* javaoop = new (C) CheckCastPPNode(control(), rawoop, oop_type); 3049 javaoop = _gvn.transform(javaoop); 3050 C->set_recent_alloc(control(), javaoop); 3051 assert(just_allocated_object(control()) == javaoop, "just allocated"); 3052 3053 #ifdef ASSERT 3054 { // Verify that the AllocateNode::Ideal_allocation recognizers work: 3055 assert(AllocateNode::Ideal_allocation(rawoop, &_gvn) == alloc, 3056 "Ideal_allocation works"); 3057 assert(AllocateNode::Ideal_allocation(javaoop, &_gvn) == alloc, 3058 "Ideal_allocation works"); 3059 if (alloc->is_AllocateArray()) { 3060 assert(AllocateArrayNode::Ideal_array_allocation(rawoop, &_gvn) == alloc->as_AllocateArray(), 3061 "Ideal_allocation works"); 3062 assert(AllocateArrayNode::Ideal_array_allocation(javaoop, &_gvn) == alloc->as_AllocateArray(), 3063 "Ideal_allocation works"); 3064 } else { 3065 assert(alloc->in(AllocateNode::ALength)->is_top(), "no length, please"); 3066 } 3067 } 3068 #endif //ASSERT 3069 3070 return javaoop; 3071 } 3072 3073 //---------------------------new_instance-------------------------------------- 3074 // This routine takes a klass_node which may be constant (for a static type) 3075 // or may be non-constant (for reflective code). It will work equally well 3076 // for either, and the graph will fold nicely if the optimizer later reduces 3077 // the type to a constant. 3078 // The optional arguments are for specialized use by intrinsics: 3079 // - If 'extra_slow_test' if not null is an extra condition for the slow-path. 3080 // - If 'return_size_val', report the the total object size to the caller. 3081 Node* GraphKit::new_instance(Node* klass_node, 3082 Node* extra_slow_test, 3083 Node* *return_size_val) { 3084 // Compute size in doublewords 3085 // The size is always an integral number of doublewords, represented 3086 // as a positive bytewise size stored in the klass's layout_helper. 3087 // The layout_helper also encodes (in a low bit) the need for a slow path. 3088 jint layout_con = Klass::_lh_neutral_value; 3089 Node* layout_val = get_layout_helper(klass_node, layout_con); 3090 int layout_is_con = (layout_val == NULL); 3091 3092 if (extra_slow_test == NULL) extra_slow_test = intcon(0); 3093 // Generate the initial go-slow test. It's either ALWAYS (return a 3094 // Node for 1) or NEVER (return a NULL) or perhaps (in the reflective 3095 // case) a computed value derived from the layout_helper. 3096 Node* initial_slow_test = NULL; 3097 if (layout_is_con) { 3098 assert(!StressReflectiveCode, "stress mode does not use these paths"); 3099 bool must_go_slow = Klass::layout_helper_needs_slow_path(layout_con); 3100 initial_slow_test = must_go_slow? intcon(1): extra_slow_test; 3101 3102 } else { // reflective case 3103 // This reflective path is used by Unsafe.allocateInstance. 3104 // (It may be stress-tested by specifying StressReflectiveCode.) 3105 // Basically, we want to get into the VM is there's an illegal argument. 3106 Node* bit = intcon(Klass::_lh_instance_slow_path_bit); 3107 initial_slow_test = _gvn.transform( new (C) AndINode(layout_val, bit) ); 3108 if (extra_slow_test != intcon(0)) { 3109 initial_slow_test = _gvn.transform( new (C) OrINode(initial_slow_test, extra_slow_test) ); 3110 } 3111 // (Macro-expander will further convert this to a Bool, if necessary.) 3112 } 3113 3114 // Find the size in bytes. This is easy; it's the layout_helper. 3115 // The size value must be valid even if the slow path is taken. 3116 Node* size = NULL; 3117 if (layout_is_con) { 3118 size = MakeConX(Klass::layout_helper_size_in_bytes(layout_con)); 3119 } else { // reflective case 3120 // This reflective path is used by clone and Unsafe.allocateInstance. 3121 size = ConvI2X(layout_val); 3122 3123 // Clear the low bits to extract layout_helper_size_in_bytes: 3124 assert((int)Klass::_lh_instance_slow_path_bit < BytesPerLong, "clear bit"); 3125 Node* mask = MakeConX(~ (intptr_t)right_n_bits(LogBytesPerLong)); 3126 size = _gvn.transform( new (C) AndXNode(size, mask) ); 3127 } 3128 if (return_size_val != NULL) { 3129 (*return_size_val) = size; 3130 } 3131 3132 // This is a precise notnull oop of the klass. 3133 // (Actually, it need not be precise if this is a reflective allocation.) 3134 // It's what we cast the result to. 3135 const TypeKlassPtr* tklass = _gvn.type(klass_node)->isa_klassptr(); 3136 if (!tklass) tklass = TypeKlassPtr::OBJECT; 3137 const TypeOopPtr* oop_type = tklass->as_instance_type(); 3138 3139 // Now generate allocation code 3140 3141 // The entire memory state is needed for slow path of the allocation 3142 // since GC and deoptimization can happened. 3143 Node *mem = reset_memory(); 3144 set_all_memory(mem); // Create new memory state 3145 3146 AllocateNode* alloc 3147 = new (C) AllocateNode(C, AllocateNode::alloc_type(), 3148 control(), mem, i_o(), 3149 size, klass_node, 3150 initial_slow_test); 3151 3152 return set_output_for_allocation(alloc, oop_type); 3153 } 3154 3155 //-------------------------------new_array------------------------------------- 3156 // helper for both newarray and anewarray 3157 // The 'length' parameter is (obviously) the length of the array. 3158 // See comments on new_instance for the meaning of the other arguments. 3159 Node* GraphKit::new_array(Node* klass_node, // array klass (maybe variable) 3160 Node* length, // number of array elements 3161 int nargs, // number of arguments to push back for uncommon trap 3162 Node* *return_size_val) { 3163 jint layout_con = Klass::_lh_neutral_value; 3164 Node* layout_val = get_layout_helper(klass_node, layout_con); 3165 int layout_is_con = (layout_val == NULL); 3166 3167 if (!layout_is_con && !StressReflectiveCode && 3168 !too_many_traps(Deoptimization::Reason_class_check)) { 3169 // This is a reflective array creation site. 3170 // Optimistically assume that it is a subtype of Object[], 3171 // so that we can fold up all the address arithmetic. 3172 layout_con = Klass::array_layout_helper(T_OBJECT); 3173 Node* cmp_lh = _gvn.transform( new(C) CmpINode(layout_val, intcon(layout_con)) ); 3174 Node* bol_lh = _gvn.transform( new(C) BoolNode(cmp_lh, BoolTest::eq) ); 3175 { BuildCutout unless(this, bol_lh, PROB_MAX); 3176 inc_sp(nargs); 3177 uncommon_trap(Deoptimization::Reason_class_check, 3178 Deoptimization::Action_maybe_recompile); 3179 } 3180 layout_val = NULL; 3181 layout_is_con = true; 3182 } 3183 3184 // Generate the initial go-slow test. Make sure we do not overflow 3185 // if length is huge (near 2Gig) or negative! We do not need 3186 // exact double-words here, just a close approximation of needed 3187 // double-words. We can't add any offset or rounding bits, lest we 3188 // take a size -1 of bytes and make it positive. Use an unsigned 3189 // compare, so negative sizes look hugely positive. 3190 int fast_size_limit = FastAllocateSizeLimit; 3191 if (layout_is_con) { 3192 assert(!StressReflectiveCode, "stress mode does not use these paths"); 3193 // Increase the size limit if we have exact knowledge of array type. 3194 int log2_esize = Klass::layout_helper_log2_element_size(layout_con); 3195 fast_size_limit <<= (LogBytesPerLong - log2_esize); 3196 } 3197 3198 Node* initial_slow_cmp = _gvn.transform( new (C) CmpUNode( length, intcon( fast_size_limit ) ) ); 3199 Node* initial_slow_test = _gvn.transform( new (C) BoolNode( initial_slow_cmp, BoolTest::gt ) ); 3200 if (initial_slow_test->is_Bool()) { 3201 // Hide it behind a CMoveI, or else PhaseIdealLoop::split_up will get sick. 3202 initial_slow_test = initial_slow_test->as_Bool()->as_int_value(&_gvn); 3203 } 3204 3205 // --- Size Computation --- 3206 // array_size = round_to_heap(array_header + (length << elem_shift)); 3207 // where round_to_heap(x) == round_to(x, MinObjAlignmentInBytes) 3208 // and round_to(x, y) == ((x + y-1) & ~(y-1)) 3209 // The rounding mask is strength-reduced, if possible. 3210 int round_mask = MinObjAlignmentInBytes - 1; 3211 Node* header_size = NULL; 3212 int header_size_min = arrayOopDesc::base_offset_in_bytes(T_BYTE); 3213 // (T_BYTE has the weakest alignment and size restrictions...) 3214 if (layout_is_con) { 3215 int hsize = Klass::layout_helper_header_size(layout_con); 3216 int eshift = Klass::layout_helper_log2_element_size(layout_con); 3217 BasicType etype = Klass::layout_helper_element_type(layout_con); 3218 if ((round_mask & ~right_n_bits(eshift)) == 0) 3219 round_mask = 0; // strength-reduce it if it goes away completely 3220 assert((hsize & right_n_bits(eshift)) == 0, "hsize is pre-rounded"); 3221 assert(header_size_min <= hsize, "generic minimum is smallest"); 3222 header_size_min = hsize; 3223 header_size = intcon(hsize + round_mask); 3224 } else { 3225 Node* hss = intcon(Klass::_lh_header_size_shift); 3226 Node* hsm = intcon(Klass::_lh_header_size_mask); 3227 Node* hsize = _gvn.transform( new(C) URShiftINode(layout_val, hss) ); 3228 hsize = _gvn.transform( new(C) AndINode(hsize, hsm) ); 3229 Node* mask = intcon(round_mask); 3230 header_size = _gvn.transform( new(C) AddINode(hsize, mask) ); 3231 } 3232 3233 Node* elem_shift = NULL; 3234 if (layout_is_con) { 3235 int eshift = Klass::layout_helper_log2_element_size(layout_con); 3236 if (eshift != 0) 3237 elem_shift = intcon(eshift); 3238 } else { 3239 // There is no need to mask or shift this value. 3240 // The semantics of LShiftINode include an implicit mask to 0x1F. 3241 assert(Klass::_lh_log2_element_size_shift == 0, "use shift in place"); 3242 elem_shift = layout_val; 3243 } 3244 3245 // Transition to native address size for all offset calculations: 3246 Node* lengthx = ConvI2X(length); 3247 Node* headerx = ConvI2X(header_size); 3248 #ifdef _LP64 3249 { const TypeLong* tllen = _gvn.find_long_type(lengthx); 3250 if (tllen != NULL && tllen->_lo < 0) { 3251 // Add a manual constraint to a positive range. Cf. array_element_address. 3252 jlong size_max = arrayOopDesc::max_array_length(T_BYTE); 3253 if (size_max > tllen->_hi) size_max = tllen->_hi; 3254 const TypeLong* tlcon = TypeLong::make(CONST64(0), size_max, Type::WidenMin); 3255 lengthx = _gvn.transform( new (C) ConvI2LNode(length, tlcon)); 3256 } 3257 } 3258 #endif 3259 3260 // Combine header size (plus rounding) and body size. Then round down. 3261 // This computation cannot overflow, because it is used only in two 3262 // places, one where the length is sharply limited, and the other 3263 // after a successful allocation. 3264 Node* abody = lengthx; 3265 if (elem_shift != NULL) 3266 abody = _gvn.transform( new(C) LShiftXNode(lengthx, elem_shift) ); 3267 Node* size = _gvn.transform( new(C) AddXNode(headerx, abody) ); 3268 if (round_mask != 0) { 3269 Node* mask = MakeConX(~round_mask); 3270 size = _gvn.transform( new(C) AndXNode(size, mask) ); 3271 } 3272 // else if round_mask == 0, the size computation is self-rounding 3273 3274 if (return_size_val != NULL) { 3275 // This is the size 3276 (*return_size_val) = size; 3277 } 3278 3279 // Now generate allocation code 3280 3281 // The entire memory state is needed for slow path of the allocation 3282 // since GC and deoptimization can happened. 3283 Node *mem = reset_memory(); 3284 set_all_memory(mem); // Create new memory state 3285 3286 // Create the AllocateArrayNode and its result projections 3287 AllocateArrayNode* alloc 3288 = new (C) AllocateArrayNode(C, AllocateArrayNode::alloc_type(), 3289 control(), mem, i_o(), 3290 size, klass_node, 3291 initial_slow_test, 3292 length); 3293 3294 // Cast to correct type. Note that the klass_node may be constant or not, 3295 // and in the latter case the actual array type will be inexact also. 3296 // (This happens via a non-constant argument to inline_native_newArray.) 3297 // In any case, the value of klass_node provides the desired array type. 3298 const TypeInt* length_type = _gvn.find_int_type(length); 3299 const TypeOopPtr* ary_type = _gvn.type(klass_node)->is_klassptr()->as_instance_type(); 3300 if (ary_type->isa_aryptr() && length_type != NULL) { 3301 // Try to get a better type than POS for the size 3302 ary_type = ary_type->is_aryptr()->cast_to_size(length_type); 3303 } 3304 3305 Node* javaoop = set_output_for_allocation(alloc, ary_type); 3306 3307 // Cast length on remaining path to be as narrow as possible 3308 if (map()->find_edge(length) >= 0) { 3309 Node* ccast = alloc->make_ideal_length(ary_type, &_gvn); 3310 if (ccast != length) { 3311 _gvn.set_type_bottom(ccast); 3312 record_for_igvn(ccast); 3313 replace_in_map(length, ccast); 3314 } 3315 } 3316 3317 return javaoop; 3318 } 3319 3320 // The following "Ideal_foo" functions are placed here because they recognize 3321 // the graph shapes created by the functions immediately above. 3322 3323 //---------------------------Ideal_allocation---------------------------------- 3324 // Given an oop pointer or raw pointer, see if it feeds from an AllocateNode. 3325 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase) { 3326 if (ptr == NULL) { // reduce dumb test in callers 3327 return NULL; 3328 } 3329 if (ptr->is_CheckCastPP()) { // strip a raw-to-oop cast 3330 ptr = ptr->in(1); 3331 if (ptr == NULL) return NULL; 3332 } 3333 if (ptr->is_Proj()) { 3334 Node* allo = ptr->in(0); 3335 if (allo != NULL && allo->is_Allocate()) { 3336 return allo->as_Allocate(); 3337 } 3338 } 3339 // Report failure to match. 3340 return NULL; 3341 } 3342 3343 // Fancy version which also strips off an offset (and reports it to caller). 3344 AllocateNode* AllocateNode::Ideal_allocation(Node* ptr, PhaseTransform* phase, 3345 intptr_t& offset) { 3346 Node* base = AddPNode::Ideal_base_and_offset(ptr, phase, offset); 3347 if (base == NULL) return NULL; 3348 return Ideal_allocation(base, phase); 3349 } 3350 3351 // Trace Initialize <- Proj[Parm] <- Allocate 3352 AllocateNode* InitializeNode::allocation() { 3353 Node* rawoop = in(InitializeNode::RawAddress); 3354 if (rawoop->is_Proj()) { 3355 Node* alloc = rawoop->in(0); 3356 if (alloc->is_Allocate()) { 3357 return alloc->as_Allocate(); 3358 } 3359 } 3360 return NULL; 3361 } 3362 3363 // Trace Allocate -> Proj[Parm] -> Initialize 3364 InitializeNode* AllocateNode::initialization() { 3365 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); 3366 if (rawoop == NULL) return NULL; 3367 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { 3368 Node* init = rawoop->fast_out(i); 3369 if (init->is_Initialize()) { 3370 assert(init->as_Initialize()->allocation() == this, "2-way link"); 3371 return init->as_Initialize(); 3372 } 3373 } 3374 return NULL; 3375 } 3376 3377 // Trace Allocate -> Proj[Parm] -> MemBarStoreStore 3378 MemBarStoreStoreNode* AllocateNode::storestore() { 3379 ProjNode* rawoop = proj_out(AllocateNode::RawAddress); 3380 if (rawoop == NULL) return NULL; 3381 for (DUIterator_Fast imax, i = rawoop->fast_outs(imax); i < imax; i++) { 3382 Node* storestore = rawoop->fast_out(i); 3383 if (storestore->is_MemBarStoreStore()) { 3384 return storestore->as_MemBarStoreStore(); 3385 } 3386 } 3387 return NULL; 3388 } 3389 3390 //----------------------------- loop predicates --------------------------- 3391 3392 //------------------------------add_predicate_impl---------------------------- 3393 void GraphKit::add_predicate_impl(Deoptimization::DeoptReason reason, int nargs) { 3394 // Too many traps seen? 3395 if (too_many_traps(reason)) { 3396 #ifdef ASSERT 3397 if (TraceLoopPredicate) { 3398 int tc = C->trap_count(reason); 3399 tty->print("too many traps=%s tcount=%d in ", 3400 Deoptimization::trap_reason_name(reason), tc); 3401 method()->print(); // which method has too many predicate traps 3402 tty->cr(); 3403 } 3404 #endif 3405 // We cannot afford to take more traps here, 3406 // do not generate predicate. 3407 return; 3408 } 3409 3410 Node *cont = _gvn.intcon(1); 3411 Node* opq = _gvn.transform(new (C) Opaque1Node(C, cont)); 3412 Node *bol = _gvn.transform(new (C) Conv2BNode(opq)); 3413 IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN); 3414 Node* iffalse = _gvn.transform(new (C) IfFalseNode(iff)); 3415 C->add_predicate_opaq(opq); 3416 { 3417 PreserveJVMState pjvms(this); 3418 set_control(iffalse); 3419 inc_sp(nargs); 3420 uncommon_trap(reason, Deoptimization::Action_maybe_recompile); 3421 } 3422 Node* iftrue = _gvn.transform(new (C) IfTrueNode(iff)); 3423 set_control(iftrue); 3424 } 3425 3426 //------------------------------add_predicate--------------------------------- 3427 void GraphKit::add_predicate(int nargs) { 3428 if (UseLoopPredicate) { 3429 add_predicate_impl(Deoptimization::Reason_predicate, nargs); 3430 } 3431 // loop's limit check predicate should be near the loop. 3432 if (LoopLimitCheck) { 3433 add_predicate_impl(Deoptimization::Reason_loop_limit_check, nargs); 3434 } 3435 } 3436 3437 //----------------------------- store barriers ---------------------------- 3438 #define __ ideal. 3439 3440 void GraphKit::sync_kit(IdealKit& ideal) { 3441 set_all_memory(__ merged_memory()); 3442 set_i_o(__ i_o()); 3443 set_control(__ ctrl()); 3444 } 3445 3446 void GraphKit::final_sync(IdealKit& ideal) { 3447 // Final sync IdealKit and graphKit. 3448 sync_kit(ideal); 3449 } 3450 3451 // vanilla/CMS post barrier 3452 // Insert a write-barrier store. This is to let generational GC work; we have 3453 // to flag all oop-stores before the next GC point. 3454 void GraphKit::write_barrier_post(Node* oop_store, 3455 Node* obj, 3456 Node* adr, 3457 uint adr_idx, 3458 Node* val, 3459 bool use_precise) { 3460 // No store check needed if we're storing a NULL or an old object 3461 // (latter case is probably a string constant). The concurrent 3462 // mark sweep garbage collector, however, needs to have all nonNull 3463 // oop updates flagged via card-marks. 3464 if (val != NULL && val->is_Con()) { 3465 // must be either an oop or NULL 3466 const Type* t = val->bottom_type(); 3467 if (t == TypePtr::NULL_PTR || t == Type::TOP) 3468 // stores of null never (?) need barriers 3469 return; 3470 } 3471 3472 if (use_ReduceInitialCardMarks() 3473 && obj == just_allocated_object(control())) { 3474 // We can skip marks on a freshly-allocated object in Eden. 3475 // Keep this code in sync with new_store_pre_barrier() in runtime.cpp. 3476 // That routine informs GC to take appropriate compensating steps, 3477 // upon a slow-path allocation, so as to make this card-mark 3478 // elision safe. 3479 return; 3480 } 3481 3482 if (!use_precise) { 3483 // All card marks for a (non-array) instance are in one place: 3484 adr = obj; 3485 } 3486 // (Else it's an array (or unknown), and we want more precise card marks.) 3487 assert(adr != NULL, ""); 3488 3489 IdealKit ideal(this, true); 3490 3491 // Convert the pointer to an int prior to doing math on it 3492 Node* cast = __ CastPX(__ ctrl(), adr); 3493 3494 // Divide by card size 3495 assert(Universe::heap()->barrier_set()->kind() == BarrierSet::CardTableModRef, 3496 "Only one we handle so far."); 3497 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); 3498 3499 // Combine card table base and card offset 3500 Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset ); 3501 3502 // Get the alias_index for raw card-mark memory 3503 int adr_type = Compile::AliasIdxRaw; 3504 Node* zero = __ ConI(0); // Dirty card value 3505 BasicType bt = T_BYTE; 3506 3507 if (UseCondCardMark) { 3508 // The classic GC reference write barrier is typically implemented 3509 // as a store into the global card mark table. Unfortunately 3510 // unconditional stores can result in false sharing and excessive 3511 // coherence traffic as well as false transactional aborts. 3512 // UseCondCardMark enables MP "polite" conditional card mark 3513 // stores. In theory we could relax the load from ctrl() to 3514 // no_ctrl, but that doesn't buy much latitude. 3515 Node* card_val = __ load( __ ctrl(), card_adr, TypeInt::BYTE, bt, adr_type); 3516 __ if_then(card_val, BoolTest::ne, zero); 3517 } 3518 3519 // Smash zero into card 3520 if( !UseConcMarkSweepGC ) { 3521 __ store(__ ctrl(), card_adr, zero, bt, adr_type); 3522 } else { 3523 // Specialized path for CM store barrier 3524 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type); 3525 } 3526 3527 if (UseCondCardMark) { 3528 __ end_if(); 3529 } 3530 3531 // Final sync IdealKit and GraphKit. 3532 final_sync(ideal); 3533 } 3534 3535 // G1 pre/post barriers 3536 void GraphKit::g1_write_barrier_pre(bool do_load, 3537 Node* obj, 3538 Node* adr, 3539 uint alias_idx, 3540 Node* val, 3541 const TypeOopPtr* val_type, 3542 Node* pre_val, 3543 BasicType bt) { 3544 3545 // Some sanity checks 3546 // Note: val is unused in this routine. 3547 3548 if (do_load) { 3549 // We need to generate the load of the previous value 3550 assert(obj != NULL, "must have a base"); 3551 assert(adr != NULL, "where are loading from?"); 3552 assert(pre_val == NULL, "loaded already?"); 3553 assert(val_type != NULL, "need a type"); 3554 } else { 3555 // In this case both val_type and alias_idx are unused. 3556 assert(pre_val != NULL, "must be loaded already"); 3557 assert(pre_val->bottom_type()->basic_type() == T_OBJECT, "or we shouldn't be here"); 3558 } 3559 assert(bt == T_OBJECT, "or we shouldn't be here"); 3560 3561 IdealKit ideal(this, true); 3562 3563 Node* tls = __ thread(); // ThreadLocalStorage 3564 3565 Node* no_ctrl = NULL; 3566 Node* no_base = __ top(); 3567 Node* zero = __ ConI(0); 3568 3569 float likely = PROB_LIKELY(0.999); 3570 float unlikely = PROB_UNLIKELY(0.999); 3571 3572 BasicType active_type = in_bytes(PtrQueue::byte_width_of_active()) == 4 ? T_INT : T_BYTE; 3573 assert(in_bytes(PtrQueue::byte_width_of_active()) == 4 || in_bytes(PtrQueue::byte_width_of_active()) == 1, "flag width"); 3574 3575 // Offsets into the thread 3576 const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 648 3577 PtrQueue::byte_offset_of_active()); 3578 const int index_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 656 3579 PtrQueue::byte_offset_of_index()); 3580 const int buffer_offset = in_bytes(JavaThread::satb_mark_queue_offset() + // 652 3581 PtrQueue::byte_offset_of_buf()); 3582 3583 // Now the actual pointers into the thread 3584 Node* marking_adr = __ AddP(no_base, tls, __ ConX(marking_offset)); 3585 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); 3586 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); 3587 3588 // Now some of the values 3589 Node* marking = __ load(__ ctrl(), marking_adr, TypeInt::INT, active_type, Compile::AliasIdxRaw); 3590 3591 // if (!marking) 3592 __ if_then(marking, BoolTest::ne, zero); { 3593 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); 3594 3595 if (do_load) { 3596 // load original value 3597 // alias_idx correct?? 3598 pre_val = __ load(no_ctrl, adr, val_type, bt, alias_idx); 3599 } 3600 3601 // if (pre_val != NULL) 3602 __ if_then(pre_val, BoolTest::ne, null()); { 3603 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); 3604 3605 // is the queue for this thread full? 3606 __ if_then(index, BoolTest::ne, zero, likely); { 3607 3608 // decrement the index 3609 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); 3610 Node* next_indexX = next_index; 3611 #ifdef _LP64 3612 // We could refine the type for what it's worth 3613 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); 3614 next_indexX = _gvn.transform( new (C) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); 3615 #endif 3616 3617 // Now get the buffer location we will log the previous value into and store it 3618 Node *log_addr = __ AddP(no_base, buffer, next_indexX); 3619 __ store(__ ctrl(), log_addr, pre_val, T_OBJECT, Compile::AliasIdxRaw); 3620 // update the index 3621 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); 3622 3623 } __ else_(); { 3624 3625 // logging buffer is full, call the runtime 3626 const TypeFunc *tf = OptoRuntime::g1_wb_pre_Type(); 3627 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), "g1_wb_pre", pre_val, tls); 3628 } __ end_if(); // (!index) 3629 } __ end_if(); // (pre_val != NULL) 3630 } __ end_if(); // (!marking) 3631 3632 // Final sync IdealKit and GraphKit. 3633 final_sync(ideal); 3634 } 3635 3636 // 3637 // Update the card table and add card address to the queue 3638 // 3639 void GraphKit::g1_mark_card(IdealKit& ideal, 3640 Node* card_adr, 3641 Node* oop_store, 3642 uint oop_alias_idx, 3643 Node* index, 3644 Node* index_adr, 3645 Node* buffer, 3646 const TypeFunc* tf) { 3647 3648 Node* zero = __ ConI(0); 3649 Node* no_base = __ top(); 3650 BasicType card_bt = T_BYTE; 3651 // Smash zero into card. MUST BE ORDERED WRT TO STORE 3652 __ storeCM(__ ctrl(), card_adr, zero, oop_store, oop_alias_idx, card_bt, Compile::AliasIdxRaw); 3653 3654 // Now do the queue work 3655 __ if_then(index, BoolTest::ne, zero); { 3656 3657 Node* next_index = __ SubI(index, __ ConI(sizeof(intptr_t))); 3658 Node* next_indexX = next_index; 3659 #ifdef _LP64 3660 // We could refine the type for what it's worth 3661 // const TypeLong* lidxtype = TypeLong::make(CONST64(0), get_size_from_queue); 3662 next_indexX = _gvn.transform( new (C) ConvI2LNode(next_index, TypeLong::make(0, max_jlong, Type::WidenMax)) ); 3663 #endif // _LP64 3664 Node* log_addr = __ AddP(no_base, buffer, next_indexX); 3665 3666 __ store(__ ctrl(), log_addr, card_adr, T_ADDRESS, Compile::AliasIdxRaw); 3667 __ store(__ ctrl(), index_adr, next_index, T_INT, Compile::AliasIdxRaw); 3668 3669 } __ else_(); { 3670 __ make_leaf_call(tf, CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), "g1_wb_post", card_adr, __ thread()); 3671 } __ end_if(); 3672 3673 } 3674 3675 void GraphKit::g1_write_barrier_post(Node* oop_store, 3676 Node* obj, 3677 Node* adr, 3678 uint alias_idx, 3679 Node* val, 3680 BasicType bt, 3681 bool use_precise) { 3682 // If we are writing a NULL then we need no post barrier 3683 3684 if (val != NULL && val->is_Con() && val->bottom_type() == TypePtr::NULL_PTR) { 3685 // Must be NULL 3686 const Type* t = val->bottom_type(); 3687 assert(t == Type::TOP || t == TypePtr::NULL_PTR, "must be NULL"); 3688 // No post barrier if writing NULLx 3689 return; 3690 } 3691 3692 if (!use_precise) { 3693 // All card marks for a (non-array) instance are in one place: 3694 adr = obj; 3695 } 3696 // (Else it's an array (or unknown), and we want more precise card marks.) 3697 assert(adr != NULL, ""); 3698 3699 IdealKit ideal(this, true); 3700 3701 Node* tls = __ thread(); // ThreadLocalStorage 3702 3703 Node* no_base = __ top(); 3704 float likely = PROB_LIKELY(0.999); 3705 float unlikely = PROB_UNLIKELY(0.999); 3706 Node* zero = __ ConI(0); 3707 Node* zeroX = __ ConX(0); 3708 3709 // Get the alias_index for raw card-mark memory 3710 const TypePtr* card_type = TypeRawPtr::BOTTOM; 3711 3712 const TypeFunc *tf = OptoRuntime::g1_wb_post_Type(); 3713 3714 // Offsets into the thread 3715 const int index_offset = in_bytes(JavaThread::dirty_card_queue_offset() + 3716 PtrQueue::byte_offset_of_index()); 3717 const int buffer_offset = in_bytes(JavaThread::dirty_card_queue_offset() + 3718 PtrQueue::byte_offset_of_buf()); 3719 3720 // Pointers into the thread 3721 3722 Node* buffer_adr = __ AddP(no_base, tls, __ ConX(buffer_offset)); 3723 Node* index_adr = __ AddP(no_base, tls, __ ConX(index_offset)); 3724 3725 // Now some values 3726 // Use ctrl to avoid hoisting these values past a safepoint, which could 3727 // potentially reset these fields in the JavaThread. 3728 Node* index = __ load(__ ctrl(), index_adr, TypeInt::INT, T_INT, Compile::AliasIdxRaw); 3729 Node* buffer = __ load(__ ctrl(), buffer_adr, TypeRawPtr::NOTNULL, T_ADDRESS, Compile::AliasIdxRaw); 3730 3731 // Convert the store obj pointer to an int prior to doing math on it 3732 // Must use ctrl to prevent "integerized oop" existing across safepoint 3733 Node* cast = __ CastPX(__ ctrl(), adr); 3734 3735 // Divide pointer by card size 3736 Node* card_offset = __ URShiftX( cast, __ ConI(CardTableModRefBS::card_shift) ); 3737 3738 // Combine card table base and card offset 3739 Node* card_adr = __ AddP(no_base, byte_map_base_node(), card_offset ); 3740 3741 // If we know the value being stored does it cross regions? 3742 3743 if (val != NULL) { 3744 // Does the store cause us to cross regions? 3745 3746 // Should be able to do an unsigned compare of region_size instead of 3747 // and extra shift. Do we have an unsigned compare?? 3748 // Node* region_size = __ ConI(1 << HeapRegion::LogOfHRGrainBytes); 3749 Node* xor_res = __ URShiftX ( __ XorX( cast, __ CastPX(__ ctrl(), val)), __ ConI(HeapRegion::LogOfHRGrainBytes)); 3750 3751 // if (xor_res == 0) same region so skip 3752 __ if_then(xor_res, BoolTest::ne, zeroX); { 3753 3754 // No barrier if we are storing a NULL 3755 __ if_then(val, BoolTest::ne, null(), unlikely); { 3756 3757 // Ok must mark the card if not already dirty 3758 3759 // load the original value of the card 3760 Node* card_val = __ load(__ ctrl(), card_adr, TypeInt::INT, T_BYTE, Compile::AliasIdxRaw); 3761 3762 __ if_then(card_val, BoolTest::ne, zero); { 3763 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); 3764 } __ end_if(); 3765 } __ end_if(); 3766 } __ end_if(); 3767 } else { 3768 // Object.clone() instrinsic uses this path. 3769 g1_mark_card(ideal, card_adr, oop_store, alias_idx, index, index_adr, buffer, tf); 3770 } 3771 3772 // Final sync IdealKit and GraphKit. 3773 final_sync(ideal); 3774 } 3775 #undef __ 3776 3777 3778 3779 Node* GraphKit::load_String_offset(Node* ctrl, Node* str) { 3780 if (java_lang_String::has_offset_field()) { 3781 int offset_offset = java_lang_String::offset_offset_in_bytes(); 3782 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 3783 false, NULL, 0); 3784 const TypePtr* offset_field_type = string_type->add_offset(offset_offset); 3785 int offset_field_idx = C->get_alias_index(offset_field_type); 3786 return make_load(ctrl, 3787 basic_plus_adr(str, str, offset_offset), 3788 TypeInt::INT, T_INT, offset_field_idx); 3789 } else { 3790 return intcon(0); 3791 } 3792 } 3793 3794 Node* GraphKit::load_String_length(Node* ctrl, Node* str) { 3795 if (java_lang_String::has_count_field()) { 3796 int count_offset = java_lang_String::count_offset_in_bytes(); 3797 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 3798 false, NULL, 0); 3799 const TypePtr* count_field_type = string_type->add_offset(count_offset); 3800 int count_field_idx = C->get_alias_index(count_field_type); 3801 return make_load(ctrl, 3802 basic_plus_adr(str, str, count_offset), 3803 TypeInt::INT, T_INT, count_field_idx); 3804 } else { 3805 return load_array_length(load_String_value(ctrl, str)); 3806 } 3807 } 3808 3809 Node* GraphKit::load_String_value(Node* ctrl, Node* str) { 3810 int value_offset = java_lang_String::value_offset_in_bytes(); 3811 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 3812 false, NULL, 0); 3813 const TypePtr* value_field_type = string_type->add_offset(value_offset); 3814 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, 3815 TypeAry::make(TypeInt::CHAR,TypeInt::POS), 3816 ciTypeArrayKlass::make(T_CHAR), true, 0); 3817 int value_field_idx = C->get_alias_index(value_field_type); 3818 return make_load(ctrl, basic_plus_adr(str, str, value_offset), 3819 value_type, T_OBJECT, value_field_idx); 3820 } 3821 3822 void GraphKit::store_String_offset(Node* ctrl, Node* str, Node* value) { 3823 int offset_offset = java_lang_String::offset_offset_in_bytes(); 3824 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 3825 false, NULL, 0); 3826 const TypePtr* offset_field_type = string_type->add_offset(offset_offset); 3827 int offset_field_idx = C->get_alias_index(offset_field_type); 3828 store_to_memory(ctrl, basic_plus_adr(str, offset_offset), 3829 value, T_INT, offset_field_idx); 3830 } 3831 3832 void GraphKit::store_String_value(Node* ctrl, Node* str, Node* value) { 3833 int value_offset = java_lang_String::value_offset_in_bytes(); 3834 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 3835 false, NULL, 0); 3836 const TypePtr* value_field_type = string_type->add_offset(value_offset); 3837 const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull, 3838 TypeAry::make(TypeInt::CHAR,TypeInt::POS), 3839 ciTypeArrayKlass::make(T_CHAR), true, 0); 3840 int value_field_idx = C->get_alias_index(value_field_type); 3841 store_to_memory(ctrl, basic_plus_adr(str, value_offset), 3842 value, T_OBJECT, value_field_idx); 3843 } 3844 3845 void GraphKit::store_String_length(Node* ctrl, Node* str, Node* value) { 3846 int count_offset = java_lang_String::count_offset_in_bytes(); 3847 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(), 3848 false, NULL, 0); 3849 const TypePtr* count_field_type = string_type->add_offset(count_offset); 3850 int count_field_idx = C->get_alias_index(count_field_type); 3851 store_to_memory(ctrl, basic_plus_adr(str, count_offset), 3852 value, T_INT, count_field_idx); 3853 }