1 /* 2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "ci/ciConstant.hpp" 27 #include "ci/ciField.hpp" 28 #include "ci/ciMethod.hpp" 29 #include "ci/ciMethodData.hpp" 30 #include "ci/ciObjArrayKlass.hpp" 31 #include "ci/ciStreams.hpp" 32 #include "ci/ciTypeArrayKlass.hpp" 33 #include "ci/ciTypeFlow.hpp" 34 #include "compiler/compileLog.hpp" 35 #include "interpreter/bytecode.hpp" 36 #include "interpreter/bytecodes.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "runtime/deoptimization.hpp" 39 #include "utilities/growableArray.hpp" 40 41 // ciTypeFlow::JsrSet 42 // 43 // A JsrSet represents some set of JsrRecords. This class 44 // is used to record a set of all jsr routines which we permit 45 // execution to return (ret) from. 46 // 47 // During abstract interpretation, JsrSets are used to determine 48 // whether two paths which reach a given block are unique, and 49 // should be cloned apart, or are compatible, and should merge 50 // together. 51 52 // ------------------------------------------------------------------ 53 // ciTypeFlow::JsrSet::JsrSet 54 ciTypeFlow::JsrSet::JsrSet(Arena* arena, int default_len) { 55 if (arena != NULL) { 56 // Allocate growable array in Arena. 57 _set = new (arena) GrowableArray<JsrRecord*>(arena, default_len, 0, NULL); 58 } else { 59 // Allocate growable array in current ResourceArea. 60 _set = new GrowableArray<JsrRecord*>(4, 0, NULL, false); 61 } 62 } 63 64 // ------------------------------------------------------------------ 65 // ciTypeFlow::JsrSet::copy_into 66 void ciTypeFlow::JsrSet::copy_into(JsrSet* jsrs) { 67 int len = size(); 68 jsrs->_set->clear(); 69 for (int i = 0; i < len; i++) { 70 jsrs->_set->append(_set->at(i)); 71 } 72 } 73 74 // ------------------------------------------------------------------ 75 // ciTypeFlow::JsrSet::is_compatible_with 76 // 77 // !!!! MISGIVINGS ABOUT THIS... disregard 78 // 79 // Is this JsrSet compatible with some other JsrSet? 80 // 81 // In set-theoretic terms, a JsrSet can be viewed as a partial function 82 // from entry addresses to return addresses. Two JsrSets A and B are 83 // compatible iff 84 // 85 // For any x, 86 // A(x) defined and B(x) defined implies A(x) == B(x) 87 // 88 // Less formally, two JsrSets are compatible when they have identical 89 // return addresses for any entry addresses they share in common. 90 bool ciTypeFlow::JsrSet::is_compatible_with(JsrSet* other) { 91 // Walk through both sets in parallel. If the same entry address 92 // appears in both sets, then the return address must match for 93 // the sets to be compatible. 94 int size1 = size(); 95 int size2 = other->size(); 96 97 // Special case. If nothing is on the jsr stack, then there can 98 // be no ret. 99 if (size2 == 0) { 100 return true; 101 } else if (size1 != size2) { 102 return false; 103 } else { 104 for (int i = 0; i < size1; i++) { 105 JsrRecord* record1 = record_at(i); 106 JsrRecord* record2 = other->record_at(i); 107 if (record1->entry_address() != record2->entry_address() || 108 record1->return_address() != record2->return_address()) { 109 return false; 110 } 111 } 112 return true; 113 } 114 115 #if 0 116 int pos1 = 0; 117 int pos2 = 0; 118 int size1 = size(); 119 int size2 = other->size(); 120 while (pos1 < size1 && pos2 < size2) { 121 JsrRecord* record1 = record_at(pos1); 122 JsrRecord* record2 = other->record_at(pos2); 123 int entry1 = record1->entry_address(); 124 int entry2 = record2->entry_address(); 125 if (entry1 < entry2) { 126 pos1++; 127 } else if (entry1 > entry2) { 128 pos2++; 129 } else { 130 if (record1->return_address() == record2->return_address()) { 131 pos1++; 132 pos2++; 133 } else { 134 // These two JsrSets are incompatible. 135 return false; 136 } 137 } 138 } 139 // The two JsrSets agree. 140 return true; 141 #endif 142 } 143 144 // ------------------------------------------------------------------ 145 // ciTypeFlow::JsrSet::insert_jsr_record 146 // 147 // Insert the given JsrRecord into the JsrSet, maintaining the order 148 // of the set and replacing any element with the same entry address. 149 void ciTypeFlow::JsrSet::insert_jsr_record(JsrRecord* record) { 150 int len = size(); 151 int entry = record->entry_address(); 152 int pos = 0; 153 for ( ; pos < len; pos++) { 154 JsrRecord* current = record_at(pos); 155 if (entry == current->entry_address()) { 156 // Stomp over this entry. 157 _set->at_put(pos, record); 158 assert(size() == len, "must be same size"); 159 return; 160 } else if (entry < current->entry_address()) { 161 break; 162 } 163 } 164 165 // Insert the record into the list. 166 JsrRecord* swap = record; 167 JsrRecord* temp = NULL; 168 for ( ; pos < len; pos++) { 169 temp = _set->at(pos); 170 _set->at_put(pos, swap); 171 swap = temp; 172 } 173 _set->append(swap); 174 assert(size() == len+1, "must be larger"); 175 } 176 177 // ------------------------------------------------------------------ 178 // ciTypeFlow::JsrSet::remove_jsr_record 179 // 180 // Remove the JsrRecord with the given return address from the JsrSet. 181 void ciTypeFlow::JsrSet::remove_jsr_record(int return_address) { 182 int len = size(); 183 for (int i = 0; i < len; i++) { 184 if (record_at(i)->return_address() == return_address) { 185 // We have found the proper entry. Remove it from the 186 // JsrSet and exit. 187 for (int j = i+1; j < len ; j++) { 188 _set->at_put(j-1, _set->at(j)); 189 } 190 _set->trunc_to(len-1); 191 assert(size() == len-1, "must be smaller"); 192 return; 193 } 194 } 195 assert(false, "verify: returning from invalid subroutine"); 196 } 197 198 // ------------------------------------------------------------------ 199 // ciTypeFlow::JsrSet::apply_control 200 // 201 // Apply the effect of a control-flow bytecode on the JsrSet. The 202 // only bytecodes that modify the JsrSet are jsr and ret. 203 void ciTypeFlow::JsrSet::apply_control(ciTypeFlow* analyzer, 204 ciBytecodeStream* str, 205 ciTypeFlow::StateVector* state) { 206 Bytecodes::Code code = str->cur_bc(); 207 if (code == Bytecodes::_jsr) { 208 JsrRecord* record = 209 analyzer->make_jsr_record(str->get_dest(), str->next_bci()); 210 insert_jsr_record(record); 211 } else if (code == Bytecodes::_jsr_w) { 212 JsrRecord* record = 213 analyzer->make_jsr_record(str->get_far_dest(), str->next_bci()); 214 insert_jsr_record(record); 215 } else if (code == Bytecodes::_ret) { 216 Cell local = state->local(str->get_index()); 217 ciType* return_address = state->type_at(local); 218 assert(return_address->is_return_address(), "verify: wrong type"); 219 if (size() == 0) { 220 // Ret-state underflow: Hit a ret w/o any previous jsrs. Bail out. 221 // This can happen when a loop is inside a finally clause (4614060). 222 analyzer->record_failure("OSR in finally clause"); 223 return; 224 } 225 remove_jsr_record(return_address->as_return_address()->bci()); 226 } 227 } 228 229 #ifndef PRODUCT 230 // ------------------------------------------------------------------ 231 // ciTypeFlow::JsrSet::print_on 232 void ciTypeFlow::JsrSet::print_on(outputStream* st) const { 233 st->print("{ "); 234 int num_elements = size(); 235 if (num_elements > 0) { 236 int i = 0; 237 for( ; i < num_elements - 1; i++) { 238 _set->at(i)->print_on(st); 239 st->print(", "); 240 } 241 _set->at(i)->print_on(st); 242 st->print(" "); 243 } 244 st->print("}"); 245 } 246 #endif 247 248 // ciTypeFlow::StateVector 249 // 250 // A StateVector summarizes the type information at some point in 251 // the program. 252 253 // ------------------------------------------------------------------ 254 // ciTypeFlow::StateVector::type_meet 255 // 256 // Meet two types. 257 // 258 // The semi-lattice of types use by this analysis are modeled on those 259 // of the verifier. The lattice is as follows: 260 // 261 // top_type() >= all non-extremal types >= bottom_type 262 // and 263 // Every primitive type is comparable only with itself. The meet of 264 // reference types is determined by their kind: instance class, 265 // interface, or array class. The meet of two types of the same 266 // kind is their least common ancestor. The meet of two types of 267 // different kinds is always java.lang.Object. 268 ciType* ciTypeFlow::StateVector::type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer) { 269 assert(t1 != t2, "checked in caller"); 270 if (t1->equals(top_type())) { 271 return t2; 272 } else if (t2->equals(top_type())) { 273 return t1; 274 } else if (t1->is_primitive_type() || t2->is_primitive_type()) { 275 // Special case null_type. null_type meet any reference type T 276 // is T. null_type meet null_type is null_type. 277 if (t1->equals(null_type())) { 278 if (!t2->is_primitive_type() || t2->equals(null_type())) { 279 return t2; 280 } 281 } else if (t2->equals(null_type())) { 282 if (!t1->is_primitive_type()) { 283 return t1; 284 } 285 } 286 287 // At least one of the two types is a non-top primitive type. 288 // The other type is not equal to it. Fall to bottom. 289 return bottom_type(); 290 } else { 291 // Both types are non-top non-primitive types. That is, 292 // both types are either instanceKlasses or arrayKlasses. 293 ciKlass* object_klass = analyzer->env()->Object_klass(); 294 ciKlass* k1 = t1->as_klass(); 295 ciKlass* k2 = t2->as_klass(); 296 if (k1->equals(object_klass) || k2->equals(object_klass)) { 297 return object_klass; 298 } else if (!k1->is_loaded() || !k2->is_loaded()) { 299 // Unloaded classes fall to java.lang.Object at a merge. 300 return object_klass; 301 } else if (k1->is_interface() != k2->is_interface()) { 302 // When an interface meets a non-interface, we get Object; 303 // This is what the verifier does. 304 return object_klass; 305 } else if (k1->is_array_klass() || k2->is_array_klass()) { 306 // When an array meets a non-array, we get Object. 307 // When objArray meets typeArray, we also get Object. 308 // And when typeArray meets different typeArray, we again get Object. 309 // But when objArray meets objArray, we look carefully at element types. 310 if (k1->is_obj_array_klass() && k2->is_obj_array_klass()) { 311 // Meet the element types, then construct the corresponding array type. 312 ciKlass* elem1 = k1->as_obj_array_klass()->element_klass(); 313 ciKlass* elem2 = k2->as_obj_array_klass()->element_klass(); 314 ciKlass* elem = type_meet_internal(elem1, elem2, analyzer)->as_klass(); 315 // Do an easy shortcut if one type is a super of the other. 316 if (elem == elem1) { 317 assert(k1 == ciObjArrayKlass::make(elem), "shortcut is OK"); 318 return k1; 319 } else if (elem == elem2) { 320 assert(k2 == ciObjArrayKlass::make(elem), "shortcut is OK"); 321 return k2; 322 } else { 323 return ciObjArrayKlass::make(elem); 324 } 325 } else { 326 return object_klass; 327 } 328 } else { 329 // Must be two plain old instance klasses. 330 assert(k1->is_instance_klass(), "previous cases handle non-instances"); 331 assert(k2->is_instance_klass(), "previous cases handle non-instances"); 332 return k1->least_common_ancestor(k2); 333 } 334 } 335 } 336 337 338 // ------------------------------------------------------------------ 339 // ciTypeFlow::StateVector::StateVector 340 // 341 // Build a new state vector 342 ciTypeFlow::StateVector::StateVector(ciTypeFlow* analyzer) { 343 _outer = analyzer; 344 _stack_size = -1; 345 _monitor_count = -1; 346 // Allocate the _types array 347 int max_cells = analyzer->max_cells(); 348 _types = (ciType**)analyzer->arena()->Amalloc(sizeof(ciType*) * max_cells); 349 for (int i=0; i<max_cells; i++) { 350 _types[i] = top_type(); 351 } 352 _trap_bci = -1; 353 _trap_index = 0; 354 _def_locals.clear(); 355 } 356 357 358 // ------------------------------------------------------------------ 359 // ciTypeFlow::get_start_state 360 // 361 // Set this vector to the method entry state. 362 const ciTypeFlow::StateVector* ciTypeFlow::get_start_state() { 363 StateVector* state = new StateVector(this); 364 if (is_osr_flow()) { 365 ciTypeFlow* non_osr_flow = method()->get_flow_analysis(); 366 if (non_osr_flow->failing()) { 367 record_failure(non_osr_flow->failure_reason()); 368 return NULL; 369 } 370 JsrSet* jsrs = new JsrSet(NULL, 16); 371 Block* non_osr_block = non_osr_flow->existing_block_at(start_bci(), jsrs); 372 if (non_osr_block == NULL) { 373 record_failure("cannot reach OSR point"); 374 return NULL; 375 } 376 // load up the non-OSR state at this point 377 non_osr_block->copy_state_into(state); 378 int non_osr_start = non_osr_block->start(); 379 if (non_osr_start != start_bci()) { 380 // must flow forward from it 381 if (CITraceTypeFlow) { 382 tty->print_cr(">> Interpreting pre-OSR block %d:", non_osr_start); 383 } 384 Block* block = block_at(non_osr_start, jsrs); 385 assert(block->limit() == start_bci(), "must flow forward to start"); 386 flow_block(block, state, jsrs); 387 } 388 return state; 389 // Note: The code below would be an incorrect for an OSR flow, 390 // even if it were possible for an OSR entry point to be at bci zero. 391 } 392 // "Push" the method signature into the first few locals. 393 state->set_stack_size(-max_locals()); 394 if (!method()->is_static()) { 395 state->push(method()->holder()); 396 assert(state->tos() == state->local(0), ""); 397 } 398 for (ciSignatureStream str(method()->signature()); 399 !str.at_return_type(); 400 str.next()) { 401 state->push_translate(str.type()); 402 } 403 // Set the rest of the locals to bottom. 404 Cell cell = state->next_cell(state->tos()); 405 state->set_stack_size(0); 406 int limit = state->limit_cell(); 407 for (; cell < limit; cell = state->next_cell(cell)) { 408 state->set_type_at(cell, state->bottom_type()); 409 } 410 // Lock an object, if necessary. 411 state->set_monitor_count(method()->is_synchronized() ? 1 : 0); 412 return state; 413 } 414 415 // ------------------------------------------------------------------ 416 // ciTypeFlow::StateVector::copy_into 417 // 418 // Copy our value into some other StateVector 419 void ciTypeFlow::StateVector::copy_into(ciTypeFlow::StateVector* copy) 420 const { 421 copy->set_stack_size(stack_size()); 422 copy->set_monitor_count(monitor_count()); 423 Cell limit = limit_cell(); 424 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { 425 copy->set_type_at(c, type_at(c)); 426 } 427 } 428 429 // ------------------------------------------------------------------ 430 // ciTypeFlow::StateVector::meet 431 // 432 // Meets this StateVector with another, destructively modifying this 433 // one. Returns true if any modification takes place. 434 bool ciTypeFlow::StateVector::meet(const ciTypeFlow::StateVector* incoming) { 435 if (monitor_count() == -1) { 436 set_monitor_count(incoming->monitor_count()); 437 } 438 assert(monitor_count() == incoming->monitor_count(), "monitors must match"); 439 440 if (stack_size() == -1) { 441 set_stack_size(incoming->stack_size()); 442 Cell limit = limit_cell(); 443 #ifdef ASSERT 444 { for (Cell c = start_cell(); c < limit; c = next_cell(c)) { 445 assert(type_at(c) == top_type(), ""); 446 } } 447 #endif 448 // Make a simple copy of the incoming state. 449 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { 450 set_type_at(c, incoming->type_at(c)); 451 } 452 return true; // it is always different the first time 453 } 454 #ifdef ASSERT 455 if (stack_size() != incoming->stack_size()) { 456 _outer->method()->print_codes(); 457 tty->print_cr("!!!! Stack size conflict"); 458 tty->print_cr("Current state:"); 459 print_on(tty); 460 tty->print_cr("Incoming state:"); 461 ((StateVector*)incoming)->print_on(tty); 462 } 463 #endif 464 assert(stack_size() == incoming->stack_size(), "sanity"); 465 466 bool different = false; 467 Cell limit = limit_cell(); 468 for (Cell c = start_cell(); c < limit; c = next_cell(c)) { 469 ciType* t1 = type_at(c); 470 ciType* t2 = incoming->type_at(c); 471 if (!t1->equals(t2)) { 472 ciType* new_type = type_meet(t1, t2); 473 if (!t1->equals(new_type)) { 474 set_type_at(c, new_type); 475 different = true; 476 } 477 } 478 } 479 return different; 480 } 481 482 // ------------------------------------------------------------------ 483 // ciTypeFlow::StateVector::meet_exception 484 // 485 // Meets this StateVector with another, destructively modifying this 486 // one. The incoming state is coming via an exception. Returns true 487 // if any modification takes place. 488 bool ciTypeFlow::StateVector::meet_exception(ciInstanceKlass* exc, 489 const ciTypeFlow::StateVector* incoming) { 490 if (monitor_count() == -1) { 491 set_monitor_count(incoming->monitor_count()); 492 } 493 assert(monitor_count() == incoming->monitor_count(), "monitors must match"); 494 495 if (stack_size() == -1) { 496 set_stack_size(1); 497 } 498 499 assert(stack_size() == 1, "must have one-element stack"); 500 501 bool different = false; 502 503 // Meet locals from incoming array. 504 Cell limit = local(_outer->max_locals()-1); 505 for (Cell c = start_cell(); c <= limit; c = next_cell(c)) { 506 ciType* t1 = type_at(c); 507 ciType* t2 = incoming->type_at(c); 508 if (!t1->equals(t2)) { 509 ciType* new_type = type_meet(t1, t2); 510 if (!t1->equals(new_type)) { 511 set_type_at(c, new_type); 512 different = true; 513 } 514 } 515 } 516 517 // Handle stack separately. When an exception occurs, the 518 // only stack entry is the exception instance. 519 ciType* tos_type = type_at_tos(); 520 if (!tos_type->equals(exc)) { 521 ciType* new_type = type_meet(tos_type, exc); 522 if (!tos_type->equals(new_type)) { 523 set_type_at_tos(new_type); 524 different = true; 525 } 526 } 527 528 return different; 529 } 530 531 // ------------------------------------------------------------------ 532 // ciTypeFlow::StateVector::push_translate 533 void ciTypeFlow::StateVector::push_translate(ciType* type) { 534 BasicType basic_type = type->basic_type(); 535 if (basic_type == T_BOOLEAN || basic_type == T_CHAR || 536 basic_type == T_BYTE || basic_type == T_SHORT) { 537 push_int(); 538 } else { 539 push(type); 540 if (type->is_two_word()) { 541 push(half_type(type)); 542 } 543 } 544 } 545 546 // ------------------------------------------------------------------ 547 // ciTypeFlow::StateVector::do_aaload 548 void ciTypeFlow::StateVector::do_aaload(ciBytecodeStream* str) { 549 pop_int(); 550 ciObjArrayKlass* array_klass = pop_objArray(); 551 if (array_klass == NULL) { 552 // Did aaload on a null reference; push a null and ignore the exception. 553 // This instruction will never continue normally. All we have to do 554 // is report a value that will meet correctly with any downstream 555 // reference types on paths that will truly be executed. This null type 556 // meets with any reference type to yield that same reference type. 557 // (The compiler will generate an unconditional exception here.) 558 push(null_type()); 559 return; 560 } 561 if (!array_klass->is_loaded()) { 562 // Only fails for some -Xcomp runs 563 trap(str, array_klass, 564 Deoptimization::make_trap_request 565 (Deoptimization::Reason_unloaded, 566 Deoptimization::Action_reinterpret)); 567 return; 568 } 569 ciKlass* element_klass = array_klass->element_klass(); 570 if (!element_klass->is_loaded() && element_klass->is_instance_klass()) { 571 Untested("unloaded array element class in ciTypeFlow"); 572 trap(str, element_klass, 573 Deoptimization::make_trap_request 574 (Deoptimization::Reason_unloaded, 575 Deoptimization::Action_reinterpret)); 576 } else { 577 push_object(element_klass); 578 } 579 } 580 581 582 // ------------------------------------------------------------------ 583 // ciTypeFlow::StateVector::do_checkcast 584 void ciTypeFlow::StateVector::do_checkcast(ciBytecodeStream* str) { 585 bool will_link; 586 ciKlass* klass = str->get_klass(will_link); 587 if (!will_link) { 588 // VM's interpreter will not load 'klass' if object is NULL. 589 // Type flow after this block may still be needed in two situations: 590 // 1) C2 uses do_null_assert() and continues compilation for later blocks 591 // 2) C2 does an OSR compile in a later block (see bug 4778368). 592 pop_object(); 593 do_null_assert(klass); 594 } else { 595 pop_object(); 596 push_object(klass); 597 } 598 } 599 600 // ------------------------------------------------------------------ 601 // ciTypeFlow::StateVector::do_getfield 602 void ciTypeFlow::StateVector::do_getfield(ciBytecodeStream* str) { 603 // could add assert here for type of object. 604 pop_object(); 605 do_getstatic(str); 606 } 607 608 // ------------------------------------------------------------------ 609 // ciTypeFlow::StateVector::do_getstatic 610 void ciTypeFlow::StateVector::do_getstatic(ciBytecodeStream* str) { 611 bool will_link; 612 ciField* field = str->get_field(will_link); 613 if (!will_link) { 614 trap(str, field->holder(), str->get_field_holder_index()); 615 } else { 616 ciType* field_type = field->type(); 617 if (!field_type->is_loaded()) { 618 // Normally, we need the field's type to be loaded if we are to 619 // do anything interesting with its value. 620 // We used to do this: trap(str, str->get_field_signature_index()); 621 // 622 // There is one good reason not to trap here. Execution can 623 // get past this "getfield" or "getstatic" if the value of 624 // the field is null. As long as the value is null, the class 625 // does not need to be loaded! The compiler must assume that 626 // the value of the unloaded class reference is null; if the code 627 // ever sees a non-null value, loading has occurred. 628 // 629 // This actually happens often enough to be annoying. If the 630 // compiler throws an uncommon trap at this bytecode, you can 631 // get an endless loop of recompilations, when all the code 632 // needs to do is load a series of null values. Also, a trap 633 // here can make an OSR entry point unreachable, triggering the 634 // assert on non_osr_block in ciTypeFlow::get_start_state. 635 // (See bug 4379915.) 636 do_null_assert(field_type->as_klass()); 637 } else { 638 push_translate(field_type); 639 } 640 } 641 } 642 643 // ------------------------------------------------------------------ 644 // ciTypeFlow::StateVector::do_invoke 645 void ciTypeFlow::StateVector::do_invoke(ciBytecodeStream* str, 646 bool has_receiver) { 647 bool will_link; 648 ciSignature* declared_signature = NULL; 649 ciMethod* callee = str->get_method(will_link, &declared_signature); 650 assert(declared_signature != NULL, "cannot be null"); 651 if (!will_link) { 652 // We weren't able to find the method. 653 if (str->cur_bc() == Bytecodes::_invokedynamic) { 654 trap(str, NULL, 655 Deoptimization::make_trap_request 656 (Deoptimization::Reason_uninitialized, 657 Deoptimization::Action_reinterpret)); 658 } else { 659 ciKlass* unloaded_holder = callee->holder(); 660 trap(str, unloaded_holder, str->get_method_holder_index()); 661 } 662 } else { 663 // We are using the declared signature here because it might be 664 // different from the callee signature (Cf. invokedynamic and 665 // invokehandle). 666 ciSignatureStream sigstr(declared_signature); 667 const int arg_size = declared_signature->size(); 668 const int stack_base = stack_size() - arg_size; 669 int i = 0; 670 for( ; !sigstr.at_return_type(); sigstr.next()) { 671 ciType* type = sigstr.type(); 672 ciType* stack_type = type_at(stack(stack_base + i++)); 673 // Do I want to check this type? 674 // assert(stack_type->is_subtype_of(type), "bad type for field value"); 675 if (type->is_two_word()) { 676 ciType* stack_type2 = type_at(stack(stack_base + i++)); 677 assert(stack_type2->equals(half_type(type)), "must be 2nd half"); 678 } 679 } 680 assert(arg_size == i, "must match"); 681 for (int j = 0; j < arg_size; j++) { 682 pop(); 683 } 684 if (has_receiver) { 685 // Check this? 686 pop_object(); 687 } 688 assert(!sigstr.is_done(), "must have return type"); 689 ciType* return_type = sigstr.type(); 690 if (!return_type->is_void()) { 691 if (!return_type->is_loaded()) { 692 // As in do_getstatic(), generally speaking, we need the return type to 693 // be loaded if we are to do anything interesting with its value. 694 // We used to do this: trap(str, str->get_method_signature_index()); 695 // 696 // We do not trap here since execution can get past this invoke if 697 // the return value is null. As long as the value is null, the class 698 // does not need to be loaded! The compiler must assume that 699 // the value of the unloaded class reference is null; if the code 700 // ever sees a non-null value, loading has occurred. 701 // 702 // See do_getstatic() for similar explanation, as well as bug 4684993. 703 do_null_assert(return_type->as_klass()); 704 } else { 705 push_translate(return_type); 706 } 707 } 708 } 709 } 710 711 // ------------------------------------------------------------------ 712 // ciTypeFlow::StateVector::do_jsr 713 void ciTypeFlow::StateVector::do_jsr(ciBytecodeStream* str) { 714 push(ciReturnAddress::make(str->next_bci())); 715 } 716 717 // ------------------------------------------------------------------ 718 // ciTypeFlow::StateVector::do_ldc 719 void ciTypeFlow::StateVector::do_ldc(ciBytecodeStream* str) { 720 ciConstant con = str->get_constant(); 721 BasicType basic_type = con.basic_type(); 722 if (basic_type == T_ILLEGAL) { 723 // OutOfMemoryError in the CI while loading constant 724 push_null(); 725 outer()->record_failure("ldc did not link"); 726 return; 727 } 728 if (basic_type == T_OBJECT || basic_type == T_ARRAY) { 729 ciObject* obj = con.as_object(); 730 if (obj->is_null_object()) { 731 push_null(); 732 } else { 733 assert(obj->is_instance() || obj->is_array(), "must be java_mirror of klass"); 734 push_object(obj->klass()); 735 } 736 } else { 737 push_translate(ciType::make(basic_type)); 738 } 739 } 740 741 // ------------------------------------------------------------------ 742 // ciTypeFlow::StateVector::do_multianewarray 743 void ciTypeFlow::StateVector::do_multianewarray(ciBytecodeStream* str) { 744 int dimensions = str->get_dimensions(); 745 bool will_link; 746 ciArrayKlass* array_klass = str->get_klass(will_link)->as_array_klass(); 747 if (!will_link) { 748 trap(str, array_klass, str->get_klass_index()); 749 } else { 750 for (int i = 0; i < dimensions; i++) { 751 pop_int(); 752 } 753 push_object(array_klass); 754 } 755 } 756 757 // ------------------------------------------------------------------ 758 // ciTypeFlow::StateVector::do_new 759 void ciTypeFlow::StateVector::do_new(ciBytecodeStream* str) { 760 bool will_link; 761 ciKlass* klass = str->get_klass(will_link); 762 if (!will_link || str->is_unresolved_klass()) { 763 trap(str, klass, str->get_klass_index()); 764 } else { 765 push_object(klass); 766 } 767 } 768 769 // ------------------------------------------------------------------ 770 // ciTypeFlow::StateVector::do_newarray 771 void ciTypeFlow::StateVector::do_newarray(ciBytecodeStream* str) { 772 pop_int(); 773 ciKlass* klass = ciTypeArrayKlass::make((BasicType)str->get_index()); 774 push_object(klass); 775 } 776 777 // ------------------------------------------------------------------ 778 // ciTypeFlow::StateVector::do_putfield 779 void ciTypeFlow::StateVector::do_putfield(ciBytecodeStream* str) { 780 do_putstatic(str); 781 if (_trap_bci != -1) return; // unloaded field holder, etc. 782 // could add assert here for type of object. 783 pop_object(); 784 } 785 786 // ------------------------------------------------------------------ 787 // ciTypeFlow::StateVector::do_putstatic 788 void ciTypeFlow::StateVector::do_putstatic(ciBytecodeStream* str) { 789 bool will_link; 790 ciField* field = str->get_field(will_link); 791 if (!will_link) { 792 trap(str, field->holder(), str->get_field_holder_index()); 793 } else { 794 ciType* field_type = field->type(); 795 ciType* type = pop_value(); 796 // Do I want to check this type? 797 // assert(type->is_subtype_of(field_type), "bad type for field value"); 798 if (field_type->is_two_word()) { 799 ciType* type2 = pop_value(); 800 assert(type2->is_two_word(), "must be 2nd half"); 801 assert(type == half_type(type2), "must be 2nd half"); 802 } 803 } 804 } 805 806 // ------------------------------------------------------------------ 807 // ciTypeFlow::StateVector::do_ret 808 void ciTypeFlow::StateVector::do_ret(ciBytecodeStream* str) { 809 Cell index = local(str->get_index()); 810 811 ciType* address = type_at(index); 812 assert(address->is_return_address(), "bad return address"); 813 set_type_at(index, bottom_type()); 814 } 815 816 // ------------------------------------------------------------------ 817 // ciTypeFlow::StateVector::trap 818 // 819 // Stop interpretation of this path with a trap. 820 void ciTypeFlow::StateVector::trap(ciBytecodeStream* str, ciKlass* klass, int index) { 821 _trap_bci = str->cur_bci(); 822 _trap_index = index; 823 824 // Log information about this trap: 825 CompileLog* log = outer()->env()->log(); 826 if (log != NULL) { 827 int mid = log->identify(outer()->method()); 828 int kid = (klass == NULL)? -1: log->identify(klass); 829 log->begin_elem("uncommon_trap method='%d' bci='%d'", mid, str->cur_bci()); 830 char buf[100]; 831 log->print(" %s", Deoptimization::format_trap_request(buf, sizeof(buf), 832 index)); 833 if (kid >= 0) 834 log->print(" klass='%d'", kid); 835 log->end_elem(); 836 } 837 } 838 839 // ------------------------------------------------------------------ 840 // ciTypeFlow::StateVector::do_null_assert 841 // Corresponds to graphKit::do_null_assert. 842 void ciTypeFlow::StateVector::do_null_assert(ciKlass* unloaded_klass) { 843 if (unloaded_klass->is_loaded()) { 844 // We failed to link, but we can still compute with this class, 845 // since it is loaded somewhere. The compiler will uncommon_trap 846 // if the object is not null, but the typeflow pass can not assume 847 // that the object will be null, otherwise it may incorrectly tell 848 // the parser that an object is known to be null. 4761344, 4807707 849 push_object(unloaded_klass); 850 } else { 851 // The class is not loaded anywhere. It is safe to model the 852 // null in the typestates, because we can compile in a null check 853 // which will deoptimize us if someone manages to load the 854 // class later. 855 push_null(); 856 } 857 } 858 859 860 // ------------------------------------------------------------------ 861 // ciTypeFlow::StateVector::apply_one_bytecode 862 // 863 // Apply the effect of one bytecode to this StateVector 864 bool ciTypeFlow::StateVector::apply_one_bytecode(ciBytecodeStream* str) { 865 _trap_bci = -1; 866 _trap_index = 0; 867 868 if (CITraceTypeFlow) { 869 tty->print_cr(">> Interpreting bytecode %d:%s", str->cur_bci(), 870 Bytecodes::name(str->cur_bc())); 871 } 872 873 switch(str->cur_bc()) { 874 case Bytecodes::_aaload: do_aaload(str); break; 875 876 case Bytecodes::_aastore: 877 { 878 pop_object(); 879 pop_int(); 880 pop_objArray(); 881 break; 882 } 883 case Bytecodes::_aconst_null: 884 { 885 push_null(); 886 break; 887 } 888 case Bytecodes::_aload: load_local_object(str->get_index()); break; 889 case Bytecodes::_aload_0: load_local_object(0); break; 890 case Bytecodes::_aload_1: load_local_object(1); break; 891 case Bytecodes::_aload_2: load_local_object(2); break; 892 case Bytecodes::_aload_3: load_local_object(3); break; 893 894 case Bytecodes::_anewarray: 895 { 896 pop_int(); 897 bool will_link; 898 ciKlass* element_klass = str->get_klass(will_link); 899 if (!will_link) { 900 trap(str, element_klass, str->get_klass_index()); 901 } else { 902 push_object(ciObjArrayKlass::make(element_klass)); 903 } 904 break; 905 } 906 case Bytecodes::_areturn: 907 case Bytecodes::_ifnonnull: 908 case Bytecodes::_ifnull: 909 { 910 pop_object(); 911 break; 912 } 913 case Bytecodes::_monitorenter: 914 { 915 pop_object(); 916 set_monitor_count(monitor_count() + 1); 917 break; 918 } 919 case Bytecodes::_monitorexit: 920 { 921 pop_object(); 922 assert(monitor_count() > 0, "must be a monitor to exit from"); 923 set_monitor_count(monitor_count() - 1); 924 break; 925 } 926 case Bytecodes::_arraylength: 927 { 928 pop_array(); 929 push_int(); 930 break; 931 } 932 case Bytecodes::_astore: store_local_object(str->get_index()); break; 933 case Bytecodes::_astore_0: store_local_object(0); break; 934 case Bytecodes::_astore_1: store_local_object(1); break; 935 case Bytecodes::_astore_2: store_local_object(2); break; 936 case Bytecodes::_astore_3: store_local_object(3); break; 937 938 case Bytecodes::_athrow: 939 { 940 NEEDS_CLEANUP; 941 pop_object(); 942 break; 943 } 944 case Bytecodes::_baload: 945 case Bytecodes::_caload: 946 case Bytecodes::_iaload: 947 case Bytecodes::_saload: 948 { 949 pop_int(); 950 ciTypeArrayKlass* array_klass = pop_typeArray(); 951 // Put assert here for right type? 952 push_int(); 953 break; 954 } 955 case Bytecodes::_bastore: 956 case Bytecodes::_castore: 957 case Bytecodes::_iastore: 958 case Bytecodes::_sastore: 959 { 960 pop_int(); 961 pop_int(); 962 pop_typeArray(); 963 // assert here? 964 break; 965 } 966 case Bytecodes::_bipush: 967 case Bytecodes::_iconst_m1: 968 case Bytecodes::_iconst_0: 969 case Bytecodes::_iconst_1: 970 case Bytecodes::_iconst_2: 971 case Bytecodes::_iconst_3: 972 case Bytecodes::_iconst_4: 973 case Bytecodes::_iconst_5: 974 case Bytecodes::_sipush: 975 { 976 push_int(); 977 break; 978 } 979 case Bytecodes::_checkcast: do_checkcast(str); break; 980 981 case Bytecodes::_d2f: 982 { 983 pop_double(); 984 push_float(); 985 break; 986 } 987 case Bytecodes::_d2i: 988 { 989 pop_double(); 990 push_int(); 991 break; 992 } 993 case Bytecodes::_d2l: 994 { 995 pop_double(); 996 push_long(); 997 break; 998 } 999 case Bytecodes::_dadd: 1000 case Bytecodes::_ddiv: 1001 case Bytecodes::_dmul: 1002 case Bytecodes::_drem: 1003 case Bytecodes::_dsub: 1004 { 1005 pop_double(); 1006 pop_double(); 1007 push_double(); 1008 break; 1009 } 1010 case Bytecodes::_daload: 1011 { 1012 pop_int(); 1013 ciTypeArrayKlass* array_klass = pop_typeArray(); 1014 // Put assert here for right type? 1015 push_double(); 1016 break; 1017 } 1018 case Bytecodes::_dastore: 1019 { 1020 pop_double(); 1021 pop_int(); 1022 pop_typeArray(); 1023 // assert here? 1024 break; 1025 } 1026 case Bytecodes::_dcmpg: 1027 case Bytecodes::_dcmpl: 1028 { 1029 pop_double(); 1030 pop_double(); 1031 push_int(); 1032 break; 1033 } 1034 case Bytecodes::_dconst_0: 1035 case Bytecodes::_dconst_1: 1036 { 1037 push_double(); 1038 break; 1039 } 1040 case Bytecodes::_dload: load_local_double(str->get_index()); break; 1041 case Bytecodes::_dload_0: load_local_double(0); break; 1042 case Bytecodes::_dload_1: load_local_double(1); break; 1043 case Bytecodes::_dload_2: load_local_double(2); break; 1044 case Bytecodes::_dload_3: load_local_double(3); break; 1045 1046 case Bytecodes::_dneg: 1047 { 1048 pop_double(); 1049 push_double(); 1050 break; 1051 } 1052 case Bytecodes::_dreturn: 1053 { 1054 pop_double(); 1055 break; 1056 } 1057 case Bytecodes::_dstore: store_local_double(str->get_index()); break; 1058 case Bytecodes::_dstore_0: store_local_double(0); break; 1059 case Bytecodes::_dstore_1: store_local_double(1); break; 1060 case Bytecodes::_dstore_2: store_local_double(2); break; 1061 case Bytecodes::_dstore_3: store_local_double(3); break; 1062 1063 case Bytecodes::_dup: 1064 { 1065 push(type_at_tos()); 1066 break; 1067 } 1068 case Bytecodes::_dup_x1: 1069 { 1070 ciType* value1 = pop_value(); 1071 ciType* value2 = pop_value(); 1072 push(value1); 1073 push(value2); 1074 push(value1); 1075 break; 1076 } 1077 case Bytecodes::_dup_x2: 1078 { 1079 ciType* value1 = pop_value(); 1080 ciType* value2 = pop_value(); 1081 ciType* value3 = pop_value(); 1082 push(value1); 1083 push(value3); 1084 push(value2); 1085 push(value1); 1086 break; 1087 } 1088 case Bytecodes::_dup2: 1089 { 1090 ciType* value1 = pop_value(); 1091 ciType* value2 = pop_value(); 1092 push(value2); 1093 push(value1); 1094 push(value2); 1095 push(value1); 1096 break; 1097 } 1098 case Bytecodes::_dup2_x1: 1099 { 1100 ciType* value1 = pop_value(); 1101 ciType* value2 = pop_value(); 1102 ciType* value3 = pop_value(); 1103 push(value2); 1104 push(value1); 1105 push(value3); 1106 push(value2); 1107 push(value1); 1108 break; 1109 } 1110 case Bytecodes::_dup2_x2: 1111 { 1112 ciType* value1 = pop_value(); 1113 ciType* value2 = pop_value(); 1114 ciType* value3 = pop_value(); 1115 ciType* value4 = pop_value(); 1116 push(value2); 1117 push(value1); 1118 push(value4); 1119 push(value3); 1120 push(value2); 1121 push(value1); 1122 break; 1123 } 1124 case Bytecodes::_f2d: 1125 { 1126 pop_float(); 1127 push_double(); 1128 break; 1129 } 1130 case Bytecodes::_f2i: 1131 { 1132 pop_float(); 1133 push_int(); 1134 break; 1135 } 1136 case Bytecodes::_f2l: 1137 { 1138 pop_float(); 1139 push_long(); 1140 break; 1141 } 1142 case Bytecodes::_fadd: 1143 case Bytecodes::_fdiv: 1144 case Bytecodes::_fmul: 1145 case Bytecodes::_frem: 1146 case Bytecodes::_fsub: 1147 { 1148 pop_float(); 1149 pop_float(); 1150 push_float(); 1151 break; 1152 } 1153 case Bytecodes::_faload: 1154 { 1155 pop_int(); 1156 ciTypeArrayKlass* array_klass = pop_typeArray(); 1157 // Put assert here. 1158 push_float(); 1159 break; 1160 } 1161 case Bytecodes::_fastore: 1162 { 1163 pop_float(); 1164 pop_int(); 1165 ciTypeArrayKlass* array_klass = pop_typeArray(); 1166 // Put assert here. 1167 break; 1168 } 1169 case Bytecodes::_fcmpg: 1170 case Bytecodes::_fcmpl: 1171 { 1172 pop_float(); 1173 pop_float(); 1174 push_int(); 1175 break; 1176 } 1177 case Bytecodes::_fconst_0: 1178 case Bytecodes::_fconst_1: 1179 case Bytecodes::_fconst_2: 1180 { 1181 push_float(); 1182 break; 1183 } 1184 case Bytecodes::_fload: load_local_float(str->get_index()); break; 1185 case Bytecodes::_fload_0: load_local_float(0); break; 1186 case Bytecodes::_fload_1: load_local_float(1); break; 1187 case Bytecodes::_fload_2: load_local_float(2); break; 1188 case Bytecodes::_fload_3: load_local_float(3); break; 1189 1190 case Bytecodes::_fneg: 1191 { 1192 pop_float(); 1193 push_float(); 1194 break; 1195 } 1196 case Bytecodes::_freturn: 1197 { 1198 pop_float(); 1199 break; 1200 } 1201 case Bytecodes::_fstore: store_local_float(str->get_index()); break; 1202 case Bytecodes::_fstore_0: store_local_float(0); break; 1203 case Bytecodes::_fstore_1: store_local_float(1); break; 1204 case Bytecodes::_fstore_2: store_local_float(2); break; 1205 case Bytecodes::_fstore_3: store_local_float(3); break; 1206 1207 case Bytecodes::_getfield: do_getfield(str); break; 1208 case Bytecodes::_getstatic: do_getstatic(str); break; 1209 1210 case Bytecodes::_goto: 1211 case Bytecodes::_goto_w: 1212 case Bytecodes::_nop: 1213 case Bytecodes::_return: 1214 { 1215 // do nothing. 1216 break; 1217 } 1218 case Bytecodes::_i2b: 1219 case Bytecodes::_i2c: 1220 case Bytecodes::_i2s: 1221 case Bytecodes::_ineg: 1222 { 1223 pop_int(); 1224 push_int(); 1225 break; 1226 } 1227 case Bytecodes::_i2d: 1228 { 1229 pop_int(); 1230 push_double(); 1231 break; 1232 } 1233 case Bytecodes::_i2f: 1234 { 1235 pop_int(); 1236 push_float(); 1237 break; 1238 } 1239 case Bytecodes::_i2l: 1240 { 1241 pop_int(); 1242 push_long(); 1243 break; 1244 } 1245 case Bytecodes::_iadd: 1246 case Bytecodes::_iand: 1247 case Bytecodes::_idiv: 1248 case Bytecodes::_imul: 1249 case Bytecodes::_ior: 1250 case Bytecodes::_irem: 1251 case Bytecodes::_ishl: 1252 case Bytecodes::_ishr: 1253 case Bytecodes::_isub: 1254 case Bytecodes::_iushr: 1255 case Bytecodes::_ixor: 1256 { 1257 pop_int(); 1258 pop_int(); 1259 push_int(); 1260 break; 1261 } 1262 case Bytecodes::_if_acmpeq: 1263 case Bytecodes::_if_acmpne: 1264 { 1265 pop_object(); 1266 pop_object(); 1267 break; 1268 } 1269 case Bytecodes::_if_icmpeq: 1270 case Bytecodes::_if_icmpge: 1271 case Bytecodes::_if_icmpgt: 1272 case Bytecodes::_if_icmple: 1273 case Bytecodes::_if_icmplt: 1274 case Bytecodes::_if_icmpne: 1275 { 1276 pop_int(); 1277 pop_int(); 1278 break; 1279 } 1280 case Bytecodes::_ifeq: 1281 case Bytecodes::_ifle: 1282 case Bytecodes::_iflt: 1283 case Bytecodes::_ifge: 1284 case Bytecodes::_ifgt: 1285 case Bytecodes::_ifne: 1286 case Bytecodes::_ireturn: 1287 case Bytecodes::_lookupswitch: 1288 case Bytecodes::_tableswitch: 1289 { 1290 pop_int(); 1291 break; 1292 } 1293 case Bytecodes::_iinc: 1294 { 1295 int lnum = str->get_index(); 1296 check_int(local(lnum)); 1297 store_to_local(lnum); 1298 break; 1299 } 1300 case Bytecodes::_iload: load_local_int(str->get_index()); break; 1301 case Bytecodes::_iload_0: load_local_int(0); break; 1302 case Bytecodes::_iload_1: load_local_int(1); break; 1303 case Bytecodes::_iload_2: load_local_int(2); break; 1304 case Bytecodes::_iload_3: load_local_int(3); break; 1305 1306 case Bytecodes::_instanceof: 1307 { 1308 // Check for uncommon trap: 1309 do_checkcast(str); 1310 pop_object(); 1311 push_int(); 1312 break; 1313 } 1314 case Bytecodes::_invokeinterface: do_invoke(str, true); break; 1315 case Bytecodes::_invokespecial: do_invoke(str, true); break; 1316 case Bytecodes::_invokestatic: do_invoke(str, false); break; 1317 case Bytecodes::_invokevirtual: do_invoke(str, true); break; 1318 case Bytecodes::_invokedynamic: do_invoke(str, false); break; 1319 1320 case Bytecodes::_istore: store_local_int(str->get_index()); break; 1321 case Bytecodes::_istore_0: store_local_int(0); break; 1322 case Bytecodes::_istore_1: store_local_int(1); break; 1323 case Bytecodes::_istore_2: store_local_int(2); break; 1324 case Bytecodes::_istore_3: store_local_int(3); break; 1325 1326 case Bytecodes::_jsr: 1327 case Bytecodes::_jsr_w: do_jsr(str); break; 1328 1329 case Bytecodes::_l2d: 1330 { 1331 pop_long(); 1332 push_double(); 1333 break; 1334 } 1335 case Bytecodes::_l2f: 1336 { 1337 pop_long(); 1338 push_float(); 1339 break; 1340 } 1341 case Bytecodes::_l2i: 1342 { 1343 pop_long(); 1344 push_int(); 1345 break; 1346 } 1347 case Bytecodes::_ladd: 1348 case Bytecodes::_land: 1349 case Bytecodes::_ldiv: 1350 case Bytecodes::_lmul: 1351 case Bytecodes::_lor: 1352 case Bytecodes::_lrem: 1353 case Bytecodes::_lsub: 1354 case Bytecodes::_lxor: 1355 { 1356 pop_long(); 1357 pop_long(); 1358 push_long(); 1359 break; 1360 } 1361 case Bytecodes::_laload: 1362 { 1363 pop_int(); 1364 ciTypeArrayKlass* array_klass = pop_typeArray(); 1365 // Put assert here for right type? 1366 push_long(); 1367 break; 1368 } 1369 case Bytecodes::_lastore: 1370 { 1371 pop_long(); 1372 pop_int(); 1373 pop_typeArray(); 1374 // assert here? 1375 break; 1376 } 1377 case Bytecodes::_lcmp: 1378 { 1379 pop_long(); 1380 pop_long(); 1381 push_int(); 1382 break; 1383 } 1384 case Bytecodes::_lconst_0: 1385 case Bytecodes::_lconst_1: 1386 { 1387 push_long(); 1388 break; 1389 } 1390 case Bytecodes::_ldc: 1391 case Bytecodes::_ldc_w: 1392 case Bytecodes::_ldc2_w: 1393 { 1394 do_ldc(str); 1395 break; 1396 } 1397 1398 case Bytecodes::_lload: load_local_long(str->get_index()); break; 1399 case Bytecodes::_lload_0: load_local_long(0); break; 1400 case Bytecodes::_lload_1: load_local_long(1); break; 1401 case Bytecodes::_lload_2: load_local_long(2); break; 1402 case Bytecodes::_lload_3: load_local_long(3); break; 1403 1404 case Bytecodes::_lneg: 1405 { 1406 pop_long(); 1407 push_long(); 1408 break; 1409 } 1410 case Bytecodes::_lreturn: 1411 { 1412 pop_long(); 1413 break; 1414 } 1415 case Bytecodes::_lshl: 1416 case Bytecodes::_lshr: 1417 case Bytecodes::_lushr: 1418 { 1419 pop_int(); 1420 pop_long(); 1421 push_long(); 1422 break; 1423 } 1424 case Bytecodes::_lstore: store_local_long(str->get_index()); break; 1425 case Bytecodes::_lstore_0: store_local_long(0); break; 1426 case Bytecodes::_lstore_1: store_local_long(1); break; 1427 case Bytecodes::_lstore_2: store_local_long(2); break; 1428 case Bytecodes::_lstore_3: store_local_long(3); break; 1429 1430 case Bytecodes::_multianewarray: do_multianewarray(str); break; 1431 1432 case Bytecodes::_new: do_new(str); break; 1433 1434 case Bytecodes::_newarray: do_newarray(str); break; 1435 1436 case Bytecodes::_pop: 1437 { 1438 pop(); 1439 break; 1440 } 1441 case Bytecodes::_pop2: 1442 { 1443 pop(); 1444 pop(); 1445 break; 1446 } 1447 1448 case Bytecodes::_putfield: do_putfield(str); break; 1449 case Bytecodes::_putstatic: do_putstatic(str); break; 1450 1451 case Bytecodes::_ret: do_ret(str); break; 1452 1453 case Bytecodes::_swap: 1454 { 1455 ciType* value1 = pop_value(); 1456 ciType* value2 = pop_value(); 1457 push(value1); 1458 push(value2); 1459 break; 1460 } 1461 case Bytecodes::_wide: 1462 default: 1463 { 1464 // The iterator should skip this. 1465 ShouldNotReachHere(); 1466 break; 1467 } 1468 } 1469 1470 if (CITraceTypeFlow) { 1471 print_on(tty); 1472 } 1473 1474 return (_trap_bci != -1); 1475 } 1476 1477 #ifndef PRODUCT 1478 // ------------------------------------------------------------------ 1479 // ciTypeFlow::StateVector::print_cell_on 1480 void ciTypeFlow::StateVector::print_cell_on(outputStream* st, Cell c) const { 1481 ciType* type = type_at(c); 1482 if (type == top_type()) { 1483 st->print("top"); 1484 } else if (type == bottom_type()) { 1485 st->print("bottom"); 1486 } else if (type == null_type()) { 1487 st->print("null"); 1488 } else if (type == long2_type()) { 1489 st->print("long2"); 1490 } else if (type == double2_type()) { 1491 st->print("double2"); 1492 } else if (is_int(type)) { 1493 st->print("int"); 1494 } else if (is_long(type)) { 1495 st->print("long"); 1496 } else if (is_float(type)) { 1497 st->print("float"); 1498 } else if (is_double(type)) { 1499 st->print("double"); 1500 } else if (type->is_return_address()) { 1501 st->print("address(%d)", type->as_return_address()->bci()); 1502 } else { 1503 if (type->is_klass()) { 1504 type->as_klass()->name()->print_symbol_on(st); 1505 } else { 1506 st->print("UNEXPECTED TYPE"); 1507 type->print(); 1508 } 1509 } 1510 } 1511 1512 // ------------------------------------------------------------------ 1513 // ciTypeFlow::StateVector::print_on 1514 void ciTypeFlow::StateVector::print_on(outputStream* st) const { 1515 int num_locals = _outer->max_locals(); 1516 int num_stack = stack_size(); 1517 int num_monitors = monitor_count(); 1518 st->print_cr(" State : locals %d, stack %d, monitors %d", num_locals, num_stack, num_monitors); 1519 if (num_stack >= 0) { 1520 int i; 1521 for (i = 0; i < num_locals; i++) { 1522 st->print(" local %2d : ", i); 1523 print_cell_on(st, local(i)); 1524 st->cr(); 1525 } 1526 for (i = 0; i < num_stack; i++) { 1527 st->print(" stack %2d : ", i); 1528 print_cell_on(st, stack(i)); 1529 st->cr(); 1530 } 1531 } 1532 } 1533 #endif 1534 1535 1536 // ------------------------------------------------------------------ 1537 // ciTypeFlow::SuccIter::next 1538 // 1539 void ciTypeFlow::SuccIter::next() { 1540 int succ_ct = _pred->successors()->length(); 1541 int next = _index + 1; 1542 if (next < succ_ct) { 1543 _index = next; 1544 _succ = _pred->successors()->at(next); 1545 return; 1546 } 1547 for (int i = next - succ_ct; i < _pred->exceptions()->length(); i++) { 1548 // Do not compile any code for unloaded exception types. 1549 // Following compiler passes are responsible for doing this also. 1550 ciInstanceKlass* exception_klass = _pred->exc_klasses()->at(i); 1551 if (exception_klass->is_loaded()) { 1552 _index = next; 1553 _succ = _pred->exceptions()->at(i); 1554 return; 1555 } 1556 next++; 1557 } 1558 _index = -1; 1559 _succ = NULL; 1560 } 1561 1562 // ------------------------------------------------------------------ 1563 // ciTypeFlow::SuccIter::set_succ 1564 // 1565 void ciTypeFlow::SuccIter::set_succ(Block* succ) { 1566 int succ_ct = _pred->successors()->length(); 1567 if (_index < succ_ct) { 1568 _pred->successors()->at_put(_index, succ); 1569 } else { 1570 int idx = _index - succ_ct; 1571 _pred->exceptions()->at_put(idx, succ); 1572 } 1573 } 1574 1575 // ciTypeFlow::Block 1576 // 1577 // A basic block. 1578 1579 // ------------------------------------------------------------------ 1580 // ciTypeFlow::Block::Block 1581 ciTypeFlow::Block::Block(ciTypeFlow* outer, 1582 ciBlock *ciblk, 1583 ciTypeFlow::JsrSet* jsrs) { 1584 _ciblock = ciblk; 1585 _exceptions = NULL; 1586 _exc_klasses = NULL; 1587 _successors = NULL; 1588 _state = new (outer->arena()) StateVector(outer); 1589 JsrSet* new_jsrs = 1590 new (outer->arena()) JsrSet(outer->arena(), jsrs->size()); 1591 jsrs->copy_into(new_jsrs); 1592 _jsrs = new_jsrs; 1593 _next = NULL; 1594 _on_work_list = false; 1595 _backedge_copy = false; 1596 _has_monitorenter = false; 1597 _trap_bci = -1; 1598 _trap_index = 0; 1599 df_init(); 1600 1601 if (CITraceTypeFlow) { 1602 tty->print_cr(">> Created new block"); 1603 print_on(tty); 1604 } 1605 1606 assert(this->outer() == outer, "outer link set up"); 1607 assert(!outer->have_block_count(), "must not have mapped blocks yet"); 1608 } 1609 1610 // ------------------------------------------------------------------ 1611 // ciTypeFlow::Block::df_init 1612 void ciTypeFlow::Block::df_init() { 1613 _pre_order = -1; assert(!has_pre_order(), ""); 1614 _post_order = -1; assert(!has_post_order(), ""); 1615 _loop = NULL; 1616 _irreducible_entry = false; 1617 _rpo_next = NULL; 1618 } 1619 1620 // ------------------------------------------------------------------ 1621 // ciTypeFlow::Block::successors 1622 // 1623 // Get the successors for this Block. 1624 GrowableArray<ciTypeFlow::Block*>* 1625 ciTypeFlow::Block::successors(ciBytecodeStream* str, 1626 ciTypeFlow::StateVector* state, 1627 ciTypeFlow::JsrSet* jsrs) { 1628 if (_successors == NULL) { 1629 if (CITraceTypeFlow) { 1630 tty->print(">> Computing successors for block "); 1631 print_value_on(tty); 1632 tty->cr(); 1633 } 1634 1635 ciTypeFlow* analyzer = outer(); 1636 Arena* arena = analyzer->arena(); 1637 Block* block = NULL; 1638 bool has_successor = !has_trap() && 1639 (control() != ciBlock::fall_through_bci || limit() < analyzer->code_size()); 1640 if (!has_successor) { 1641 _successors = 1642 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); 1643 // No successors 1644 } else if (control() == ciBlock::fall_through_bci) { 1645 assert(str->cur_bci() == limit(), "bad block end"); 1646 // This block simply falls through to the next. 1647 _successors = 1648 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); 1649 1650 Block* block = analyzer->block_at(limit(), _jsrs); 1651 assert(_successors->length() == FALL_THROUGH, ""); 1652 _successors->append(block); 1653 } else { 1654 int current_bci = str->cur_bci(); 1655 int next_bci = str->next_bci(); 1656 int branch_bci = -1; 1657 Block* target = NULL; 1658 assert(str->next_bci() == limit(), "bad block end"); 1659 // This block is not a simple fall-though. Interpret 1660 // the current bytecode to find our successors. 1661 switch (str->cur_bc()) { 1662 case Bytecodes::_ifeq: case Bytecodes::_ifne: 1663 case Bytecodes::_iflt: case Bytecodes::_ifge: 1664 case Bytecodes::_ifgt: case Bytecodes::_ifle: 1665 case Bytecodes::_if_icmpeq: case Bytecodes::_if_icmpne: 1666 case Bytecodes::_if_icmplt: case Bytecodes::_if_icmpge: 1667 case Bytecodes::_if_icmpgt: case Bytecodes::_if_icmple: 1668 case Bytecodes::_if_acmpeq: case Bytecodes::_if_acmpne: 1669 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: 1670 // Our successors are the branch target and the next bci. 1671 branch_bci = str->get_dest(); 1672 _successors = 1673 new (arena) GrowableArray<Block*>(arena, 2, 0, NULL); 1674 assert(_successors->length() == IF_NOT_TAKEN, ""); 1675 _successors->append(analyzer->block_at(next_bci, jsrs)); 1676 assert(_successors->length() == IF_TAKEN, ""); 1677 _successors->append(analyzer->block_at(branch_bci, jsrs)); 1678 break; 1679 1680 case Bytecodes::_goto: 1681 branch_bci = str->get_dest(); 1682 _successors = 1683 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); 1684 assert(_successors->length() == GOTO_TARGET, ""); 1685 _successors->append(analyzer->block_at(branch_bci, jsrs)); 1686 break; 1687 1688 case Bytecodes::_jsr: 1689 branch_bci = str->get_dest(); 1690 _successors = 1691 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); 1692 assert(_successors->length() == GOTO_TARGET, ""); 1693 _successors->append(analyzer->block_at(branch_bci, jsrs)); 1694 break; 1695 1696 case Bytecodes::_goto_w: 1697 case Bytecodes::_jsr_w: 1698 _successors = 1699 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); 1700 assert(_successors->length() == GOTO_TARGET, ""); 1701 _successors->append(analyzer->block_at(str->get_far_dest(), jsrs)); 1702 break; 1703 1704 case Bytecodes::_tableswitch: { 1705 Bytecode_tableswitch tableswitch(str); 1706 1707 int len = tableswitch.length(); 1708 _successors = 1709 new (arena) GrowableArray<Block*>(arena, len+1, 0, NULL); 1710 int bci = current_bci + tableswitch.default_offset(); 1711 Block* block = analyzer->block_at(bci, jsrs); 1712 assert(_successors->length() == SWITCH_DEFAULT, ""); 1713 _successors->append(block); 1714 while (--len >= 0) { 1715 int bci = current_bci + tableswitch.dest_offset_at(len); 1716 block = analyzer->block_at(bci, jsrs); 1717 assert(_successors->length() >= SWITCH_CASES, ""); 1718 _successors->append_if_missing(block); 1719 } 1720 break; 1721 } 1722 1723 case Bytecodes::_lookupswitch: { 1724 Bytecode_lookupswitch lookupswitch(str); 1725 1726 int npairs = lookupswitch.number_of_pairs(); 1727 _successors = 1728 new (arena) GrowableArray<Block*>(arena, npairs+1, 0, NULL); 1729 int bci = current_bci + lookupswitch.default_offset(); 1730 Block* block = analyzer->block_at(bci, jsrs); 1731 assert(_successors->length() == SWITCH_DEFAULT, ""); 1732 _successors->append(block); 1733 while(--npairs >= 0) { 1734 LookupswitchPair pair = lookupswitch.pair_at(npairs); 1735 int bci = current_bci + pair.offset(); 1736 Block* block = analyzer->block_at(bci, jsrs); 1737 assert(_successors->length() >= SWITCH_CASES, ""); 1738 _successors->append_if_missing(block); 1739 } 1740 break; 1741 } 1742 1743 case Bytecodes::_athrow: case Bytecodes::_ireturn: 1744 case Bytecodes::_lreturn: case Bytecodes::_freturn: 1745 case Bytecodes::_dreturn: case Bytecodes::_areturn: 1746 case Bytecodes::_return: 1747 _successors = 1748 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); 1749 // No successors 1750 break; 1751 1752 case Bytecodes::_ret: { 1753 _successors = 1754 new (arena) GrowableArray<Block*>(arena, 1, 0, NULL); 1755 1756 Cell local = state->local(str->get_index()); 1757 ciType* return_address = state->type_at(local); 1758 assert(return_address->is_return_address(), "verify: wrong type"); 1759 int bci = return_address->as_return_address()->bci(); 1760 assert(_successors->length() == GOTO_TARGET, ""); 1761 _successors->append(analyzer->block_at(bci, jsrs)); 1762 break; 1763 } 1764 1765 case Bytecodes::_wide: 1766 default: 1767 ShouldNotReachHere(); 1768 break; 1769 } 1770 } 1771 } 1772 return _successors; 1773 } 1774 1775 // ------------------------------------------------------------------ 1776 // ciTypeFlow::Block:compute_exceptions 1777 // 1778 // Compute the exceptional successors and types for this Block. 1779 void ciTypeFlow::Block::compute_exceptions() { 1780 assert(_exceptions == NULL && _exc_klasses == NULL, "repeat"); 1781 1782 if (CITraceTypeFlow) { 1783 tty->print(">> Computing exceptions for block "); 1784 print_value_on(tty); 1785 tty->cr(); 1786 } 1787 1788 ciTypeFlow* analyzer = outer(); 1789 Arena* arena = analyzer->arena(); 1790 1791 // Any bci in the block will do. 1792 ciExceptionHandlerStream str(analyzer->method(), start()); 1793 1794 // Allocate our growable arrays. 1795 int exc_count = str.count(); 1796 _exceptions = new (arena) GrowableArray<Block*>(arena, exc_count, 0, NULL); 1797 _exc_klasses = new (arena) GrowableArray<ciInstanceKlass*>(arena, exc_count, 1798 0, NULL); 1799 1800 for ( ; !str.is_done(); str.next()) { 1801 ciExceptionHandler* handler = str.handler(); 1802 int bci = handler->handler_bci(); 1803 ciInstanceKlass* klass = NULL; 1804 if (bci == -1) { 1805 // There is no catch all. It is possible to exit the method. 1806 break; 1807 } 1808 if (handler->is_catch_all()) { 1809 klass = analyzer->env()->Throwable_klass(); 1810 } else { 1811 klass = handler->catch_klass(); 1812 } 1813 _exceptions->append(analyzer->block_at(bci, _jsrs)); 1814 _exc_klasses->append(klass); 1815 } 1816 } 1817 1818 // ------------------------------------------------------------------ 1819 // ciTypeFlow::Block::set_backedge_copy 1820 // Use this only to make a pre-existing public block into a backedge copy. 1821 void ciTypeFlow::Block::set_backedge_copy(bool z) { 1822 assert(z || (z == is_backedge_copy()), "cannot make a backedge copy public"); 1823 _backedge_copy = z; 1824 } 1825 1826 // ------------------------------------------------------------------ 1827 // ciTypeFlow::Block::is_clonable_exit 1828 // 1829 // At most 2 normal successors, one of which continues looping, 1830 // and all exceptional successors must exit. 1831 bool ciTypeFlow::Block::is_clonable_exit(ciTypeFlow::Loop* lp) { 1832 int normal_cnt = 0; 1833 int in_loop_cnt = 0; 1834 for (SuccIter iter(this); !iter.done(); iter.next()) { 1835 Block* succ = iter.succ(); 1836 if (iter.is_normal_ctrl()) { 1837 if (++normal_cnt > 2) return false; 1838 if (lp->contains(succ->loop())) { 1839 if (++in_loop_cnt > 1) return false; 1840 } 1841 } else { 1842 if (lp->contains(succ->loop())) return false; 1843 } 1844 } 1845 return in_loop_cnt == 1; 1846 } 1847 1848 // ------------------------------------------------------------------ 1849 // ciTypeFlow::Block::looping_succ 1850 // 1851 ciTypeFlow::Block* ciTypeFlow::Block::looping_succ(ciTypeFlow::Loop* lp) { 1852 assert(successors()->length() <= 2, "at most 2 normal successors"); 1853 for (SuccIter iter(this); !iter.done(); iter.next()) { 1854 Block* succ = iter.succ(); 1855 if (lp->contains(succ->loop())) { 1856 return succ; 1857 } 1858 } 1859 return NULL; 1860 } 1861 1862 #ifndef PRODUCT 1863 // ------------------------------------------------------------------ 1864 // ciTypeFlow::Block::print_value_on 1865 void ciTypeFlow::Block::print_value_on(outputStream* st) const { 1866 if (has_pre_order()) st->print("#%-2d ", pre_order()); 1867 if (has_rpo()) st->print("rpo#%-2d ", rpo()); 1868 st->print("[%d - %d)", start(), limit()); 1869 if (is_loop_head()) st->print(" lphd"); 1870 if (is_irreducible_entry()) st->print(" irred"); 1871 if (_jsrs->size() > 0) { st->print("/"); _jsrs->print_on(st); } 1872 if (is_backedge_copy()) st->print("/backedge_copy"); 1873 } 1874 1875 // ------------------------------------------------------------------ 1876 // ciTypeFlow::Block::print_on 1877 void ciTypeFlow::Block::print_on(outputStream* st) const { 1878 if ((Verbose || WizardMode) && (limit() >= 0)) { 1879 // Don't print 'dummy' blocks (i.e. blocks with limit() '-1') 1880 outer()->method()->print_codes_on(start(), limit(), st); 1881 } 1882 st->print_cr(" ==================================================== "); 1883 st->print (" "); 1884 print_value_on(st); 1885 st->print(" Stored locals: "); def_locals()->print_on(st, outer()->method()->max_locals()); tty->cr(); 1886 if (loop() && loop()->parent() != NULL) { 1887 st->print(" loops:"); 1888 Loop* lp = loop(); 1889 do { 1890 st->print(" %d<-%d", lp->head()->pre_order(),lp->tail()->pre_order()); 1891 if (lp->is_irreducible()) st->print("(ir)"); 1892 lp = lp->parent(); 1893 } while (lp->parent() != NULL); 1894 } 1895 st->cr(); 1896 _state->print_on(st); 1897 if (_successors == NULL) { 1898 st->print_cr(" No successor information"); 1899 } else { 1900 int num_successors = _successors->length(); 1901 st->print_cr(" Successors : %d", num_successors); 1902 for (int i = 0; i < num_successors; i++) { 1903 Block* successor = _successors->at(i); 1904 st->print(" "); 1905 successor->print_value_on(st); 1906 st->cr(); 1907 } 1908 } 1909 if (_exceptions == NULL) { 1910 st->print_cr(" No exception information"); 1911 } else { 1912 int num_exceptions = _exceptions->length(); 1913 st->print_cr(" Exceptions : %d", num_exceptions); 1914 for (int i = 0; i < num_exceptions; i++) { 1915 Block* exc_succ = _exceptions->at(i); 1916 ciInstanceKlass* exc_klass = _exc_klasses->at(i); 1917 st->print(" "); 1918 exc_succ->print_value_on(st); 1919 st->print(" -- "); 1920 exc_klass->name()->print_symbol_on(st); 1921 st->cr(); 1922 } 1923 } 1924 if (has_trap()) { 1925 st->print_cr(" Traps on %d with trap index %d", trap_bci(), trap_index()); 1926 } 1927 st->print_cr(" ==================================================== "); 1928 } 1929 #endif 1930 1931 #ifndef PRODUCT 1932 // ------------------------------------------------------------------ 1933 // ciTypeFlow::LocalSet::print_on 1934 void ciTypeFlow::LocalSet::print_on(outputStream* st, int limit) const { 1935 st->print("{"); 1936 for (int i = 0; i < max; i++) { 1937 if (test(i)) st->print(" %d", i); 1938 } 1939 if (limit > max) { 1940 st->print(" %d..%d ", max, limit); 1941 } 1942 st->print(" }"); 1943 } 1944 #endif 1945 1946 // ciTypeFlow 1947 // 1948 // This is a pass over the bytecodes which computes the following: 1949 // basic block structure 1950 // interpreter type-states (a la the verifier) 1951 1952 // ------------------------------------------------------------------ 1953 // ciTypeFlow::ciTypeFlow 1954 ciTypeFlow::ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci) { 1955 _env = env; 1956 _method = method; 1957 _methodBlocks = method->get_method_blocks(); 1958 _max_locals = method->max_locals(); 1959 _max_stack = method->max_stack(); 1960 _code_size = method->code_size(); 1961 _has_irreducible_entry = false; 1962 _osr_bci = osr_bci; 1963 _failure_reason = NULL; 1964 assert(0 <= start_bci() && start_bci() < code_size() , err_msg("correct osr_bci argument: 0 <= %d < %d", start_bci(), code_size())); 1965 _work_list = NULL; 1966 1967 _ciblock_count = _methodBlocks->num_blocks(); 1968 _idx_to_blocklist = NEW_ARENA_ARRAY(arena(), GrowableArray<Block*>*, _ciblock_count); 1969 for (int i = 0; i < _ciblock_count; i++) { 1970 _idx_to_blocklist[i] = NULL; 1971 } 1972 _block_map = NULL; // until all blocks are seen 1973 _jsr_count = 0; 1974 _jsr_records = NULL; 1975 } 1976 1977 // ------------------------------------------------------------------ 1978 // ciTypeFlow::work_list_next 1979 // 1980 // Get the next basic block from our work list. 1981 ciTypeFlow::Block* ciTypeFlow::work_list_next() { 1982 assert(!work_list_empty(), "work list must not be empty"); 1983 Block* next_block = _work_list; 1984 _work_list = next_block->next(); 1985 next_block->set_next(NULL); 1986 next_block->set_on_work_list(false); 1987 return next_block; 1988 } 1989 1990 // ------------------------------------------------------------------ 1991 // ciTypeFlow::add_to_work_list 1992 // 1993 // Add a basic block to our work list. 1994 // List is sorted by decreasing postorder sort (same as increasing RPO) 1995 void ciTypeFlow::add_to_work_list(ciTypeFlow::Block* block) { 1996 assert(!block->is_on_work_list(), "must not already be on work list"); 1997 1998 if (CITraceTypeFlow) { 1999 tty->print(">> Adding block "); 2000 block->print_value_on(tty); 2001 tty->print_cr(" to the work list : "); 2002 } 2003 2004 block->set_on_work_list(true); 2005 2006 // decreasing post order sort 2007 2008 Block* prev = NULL; 2009 Block* current = _work_list; 2010 int po = block->post_order(); 2011 while (current != NULL) { 2012 if (!current->has_post_order() || po > current->post_order()) 2013 break; 2014 prev = current; 2015 current = current->next(); 2016 } 2017 if (prev == NULL) { 2018 block->set_next(_work_list); 2019 _work_list = block; 2020 } else { 2021 block->set_next(current); 2022 prev->set_next(block); 2023 } 2024 2025 if (CITraceTypeFlow) { 2026 tty->cr(); 2027 } 2028 } 2029 2030 // ------------------------------------------------------------------ 2031 // ciTypeFlow::block_at 2032 // 2033 // Return the block beginning at bci which has a JsrSet compatible 2034 // with jsrs. 2035 ciTypeFlow::Block* ciTypeFlow::block_at(int bci, ciTypeFlow::JsrSet* jsrs, CreateOption option) { 2036 // First find the right ciBlock. 2037 if (CITraceTypeFlow) { 2038 tty->print(">> Requesting block for %d/", bci); 2039 jsrs->print_on(tty); 2040 tty->cr(); 2041 } 2042 2043 ciBlock* ciblk = _methodBlocks->block_containing(bci); 2044 assert(ciblk->start_bci() == bci, "bad ciBlock boundaries"); 2045 Block* block = get_block_for(ciblk->index(), jsrs, option); 2046 2047 assert(block == NULL? (option == no_create): block->is_backedge_copy() == (option == create_backedge_copy), "create option consistent with result"); 2048 2049 if (CITraceTypeFlow) { 2050 if (block != NULL) { 2051 tty->print(">> Found block "); 2052 block->print_value_on(tty); 2053 tty->cr(); 2054 } else { 2055 tty->print_cr(">> No such block."); 2056 } 2057 } 2058 2059 return block; 2060 } 2061 2062 // ------------------------------------------------------------------ 2063 // ciTypeFlow::make_jsr_record 2064 // 2065 // Make a JsrRecord for a given (entry, return) pair, if such a record 2066 // does not already exist. 2067 ciTypeFlow::JsrRecord* ciTypeFlow::make_jsr_record(int entry_address, 2068 int return_address) { 2069 if (_jsr_records == NULL) { 2070 _jsr_records = new (arena()) GrowableArray<JsrRecord*>(arena(), 2071 _jsr_count, 2072 0, 2073 NULL); 2074 } 2075 JsrRecord* record = NULL; 2076 int len = _jsr_records->length(); 2077 for (int i = 0; i < len; i++) { 2078 JsrRecord* record = _jsr_records->at(i); 2079 if (record->entry_address() == entry_address && 2080 record->return_address() == return_address) { 2081 return record; 2082 } 2083 } 2084 2085 record = new (arena()) JsrRecord(entry_address, return_address); 2086 _jsr_records->append(record); 2087 return record; 2088 } 2089 2090 // ------------------------------------------------------------------ 2091 // ciTypeFlow::flow_exceptions 2092 // 2093 // Merge the current state into all exceptional successors at the 2094 // current point in the code. 2095 void ciTypeFlow::flow_exceptions(GrowableArray<ciTypeFlow::Block*>* exceptions, 2096 GrowableArray<ciInstanceKlass*>* exc_klasses, 2097 ciTypeFlow::StateVector* state) { 2098 int len = exceptions->length(); 2099 assert(exc_klasses->length() == len, "must have same length"); 2100 for (int i = 0; i < len; i++) { 2101 Block* block = exceptions->at(i); 2102 ciInstanceKlass* exception_klass = exc_klasses->at(i); 2103 2104 if (!exception_klass->is_loaded()) { 2105 // Do not compile any code for unloaded exception types. 2106 // Following compiler passes are responsible for doing this also. 2107 continue; 2108 } 2109 2110 if (block->meet_exception(exception_klass, state)) { 2111 // Block was modified and has PO. Add it to the work list. 2112 if (block->has_post_order() && 2113 !block->is_on_work_list()) { 2114 add_to_work_list(block); 2115 } 2116 } 2117 } 2118 } 2119 2120 // ------------------------------------------------------------------ 2121 // ciTypeFlow::flow_successors 2122 // 2123 // Merge the current state into all successors at the current point 2124 // in the code. 2125 void ciTypeFlow::flow_successors(GrowableArray<ciTypeFlow::Block*>* successors, 2126 ciTypeFlow::StateVector* state) { 2127 int len = successors->length(); 2128 for (int i = 0; i < len; i++) { 2129 Block* block = successors->at(i); 2130 if (block->meet(state)) { 2131 // Block was modified and has PO. Add it to the work list. 2132 if (block->has_post_order() && 2133 !block->is_on_work_list()) { 2134 add_to_work_list(block); 2135 } 2136 } 2137 } 2138 } 2139 2140 // ------------------------------------------------------------------ 2141 // ciTypeFlow::can_trap 2142 // 2143 // Tells if a given instruction is able to generate an exception edge. 2144 bool ciTypeFlow::can_trap(ciBytecodeStream& str) { 2145 // Cf. GenerateOopMap::do_exception_edge. 2146 if (!Bytecodes::can_trap(str.cur_bc())) return false; 2147 2148 switch (str.cur_bc()) { 2149 // %%% FIXME: ldc of Class can generate an exception 2150 case Bytecodes::_ldc: 2151 case Bytecodes::_ldc_w: 2152 case Bytecodes::_ldc2_w: 2153 case Bytecodes::_aload_0: 2154 // These bytecodes can trap for rewriting. We need to assume that 2155 // they do not throw exceptions to make the monitor analysis work. 2156 return false; 2157 2158 case Bytecodes::_ireturn: 2159 case Bytecodes::_lreturn: 2160 case Bytecodes::_freturn: 2161 case Bytecodes::_dreturn: 2162 case Bytecodes::_areturn: 2163 case Bytecodes::_return: 2164 // We can assume the monitor stack is empty in this analysis. 2165 return false; 2166 2167 case Bytecodes::_monitorexit: 2168 // We can assume monitors are matched in this analysis. 2169 return false; 2170 } 2171 2172 return true; 2173 } 2174 2175 // ------------------------------------------------------------------ 2176 // ciTypeFlow::clone_loop_heads 2177 // 2178 // Clone the loop heads 2179 bool ciTypeFlow::clone_loop_heads(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) { 2180 bool rslt = false; 2181 for (PreorderLoops iter(loop_tree_root()); !iter.done(); iter.next()) { 2182 lp = iter.current(); 2183 Block* head = lp->head(); 2184 if (lp == loop_tree_root() || 2185 lp->is_irreducible() || 2186 !head->is_clonable_exit(lp)) 2187 continue; 2188 2189 // Avoid BoxLock merge. 2190 if (EliminateNestedLocks && head->has_monitorenter()) 2191 continue; 2192 2193 // check not already cloned 2194 if (head->backedge_copy_count() != 0) 2195 continue; 2196 2197 // Don't clone head of OSR loop to get correct types in start block. 2198 if (is_osr_flow() && head->start() == start_bci()) 2199 continue; 2200 2201 // check _no_ shared head below us 2202 Loop* ch; 2203 for (ch = lp->child(); ch != NULL && ch->head() != head; ch = ch->sibling()); 2204 if (ch != NULL) 2205 continue; 2206 2207 // Clone head 2208 Block* new_head = head->looping_succ(lp); 2209 Block* clone = clone_loop_head(lp, temp_vector, temp_set); 2210 // Update lp's info 2211 clone->set_loop(lp); 2212 lp->set_head(new_head); 2213 lp->set_tail(clone); 2214 // And move original head into outer loop 2215 head->set_loop(lp->parent()); 2216 2217 rslt = true; 2218 } 2219 return rslt; 2220 } 2221 2222 // ------------------------------------------------------------------ 2223 // ciTypeFlow::clone_loop_head 2224 // 2225 // Clone lp's head and replace tail's successors with clone. 2226 // 2227 // | 2228 // v 2229 // head <-> body 2230 // | 2231 // v 2232 // exit 2233 // 2234 // new_head 2235 // 2236 // | 2237 // v 2238 // head ----------\ 2239 // | | 2240 // | v 2241 // | clone <-> body 2242 // | | 2243 // | /--/ 2244 // | | 2245 // v v 2246 // exit 2247 // 2248 ciTypeFlow::Block* ciTypeFlow::clone_loop_head(Loop* lp, StateVector* temp_vector, JsrSet* temp_set) { 2249 Block* head = lp->head(); 2250 Block* tail = lp->tail(); 2251 if (CITraceTypeFlow) { 2252 tty->print(">> Requesting clone of loop head "); head->print_value_on(tty); 2253 tty->print(" for predecessor "); tail->print_value_on(tty); 2254 tty->cr(); 2255 } 2256 Block* clone = block_at(head->start(), head->jsrs(), create_backedge_copy); 2257 assert(clone->backedge_copy_count() == 1, "one backedge copy for all back edges"); 2258 2259 assert(!clone->has_pre_order(), "just created"); 2260 clone->set_next_pre_order(); 2261 2262 // Insert clone after (orig) tail in reverse post order 2263 clone->set_rpo_next(tail->rpo_next()); 2264 tail->set_rpo_next(clone); 2265 2266 // tail->head becomes tail->clone 2267 for (SuccIter iter(tail); !iter.done(); iter.next()) { 2268 if (iter.succ() == head) { 2269 iter.set_succ(clone); 2270 } 2271 } 2272 flow_block(tail, temp_vector, temp_set); 2273 if (head == tail) { 2274 // For self-loops, clone->head becomes clone->clone 2275 flow_block(clone, temp_vector, temp_set); 2276 for (SuccIter iter(clone); !iter.done(); iter.next()) { 2277 if (iter.succ() == head) { 2278 iter.set_succ(clone); 2279 break; 2280 } 2281 } 2282 } 2283 flow_block(clone, temp_vector, temp_set); 2284 2285 return clone; 2286 } 2287 2288 // ------------------------------------------------------------------ 2289 // ciTypeFlow::flow_block 2290 // 2291 // Interpret the effects of the bytecodes on the incoming state 2292 // vector of a basic block. Push the changed state to succeeding 2293 // basic blocks. 2294 void ciTypeFlow::flow_block(ciTypeFlow::Block* block, 2295 ciTypeFlow::StateVector* state, 2296 ciTypeFlow::JsrSet* jsrs) { 2297 if (CITraceTypeFlow) { 2298 tty->print("\n>> ANALYZING BLOCK : "); 2299 tty->cr(); 2300 block->print_on(tty); 2301 } 2302 assert(block->has_pre_order(), "pre-order is assigned before 1st flow"); 2303 2304 int start = block->start(); 2305 int limit = block->limit(); 2306 int control = block->control(); 2307 if (control != ciBlock::fall_through_bci) { 2308 limit = control; 2309 } 2310 2311 // Grab the state from the current block. 2312 block->copy_state_into(state); 2313 state->def_locals()->clear(); 2314 2315 GrowableArray<Block*>* exceptions = block->exceptions(); 2316 GrowableArray<ciInstanceKlass*>* exc_klasses = block->exc_klasses(); 2317 bool has_exceptions = exceptions->length() > 0; 2318 2319 bool exceptions_used = false; 2320 2321 ciBytecodeStream str(method()); 2322 str.reset_to_bci(start); 2323 Bytecodes::Code code; 2324 while ((code = str.next()) != ciBytecodeStream::EOBC() && 2325 str.cur_bci() < limit) { 2326 // Check for exceptional control flow from this point. 2327 if (has_exceptions && can_trap(str)) { 2328 flow_exceptions(exceptions, exc_klasses, state); 2329 exceptions_used = true; 2330 } 2331 // Apply the effects of the current bytecode to our state. 2332 bool res = state->apply_one_bytecode(&str); 2333 2334 // Watch for bailouts. 2335 if (failing()) return; 2336 2337 if (str.cur_bc() == Bytecodes::_monitorenter) { 2338 block->set_has_monitorenter(); 2339 } 2340 2341 if (res) { 2342 2343 // We have encountered a trap. Record it in this block. 2344 block->set_trap(state->trap_bci(), state->trap_index()); 2345 2346 if (CITraceTypeFlow) { 2347 tty->print_cr(">> Found trap"); 2348 block->print_on(tty); 2349 } 2350 2351 // Save set of locals defined in this block 2352 block->def_locals()->add(state->def_locals()); 2353 2354 // Record (no) successors. 2355 block->successors(&str, state, jsrs); 2356 2357 assert(!has_exceptions || exceptions_used, "Not removing exceptions"); 2358 2359 // Discontinue interpretation of this Block. 2360 return; 2361 } 2362 } 2363 2364 GrowableArray<Block*>* successors = NULL; 2365 if (control != ciBlock::fall_through_bci) { 2366 // Check for exceptional control flow from this point. 2367 if (has_exceptions && can_trap(str)) { 2368 flow_exceptions(exceptions, exc_klasses, state); 2369 exceptions_used = true; 2370 } 2371 2372 // Fix the JsrSet to reflect effect of the bytecode. 2373 block->copy_jsrs_into(jsrs); 2374 jsrs->apply_control(this, &str, state); 2375 2376 // Find successor edges based on old state and new JsrSet. 2377 successors = block->successors(&str, state, jsrs); 2378 2379 // Apply the control changes to the state. 2380 state->apply_one_bytecode(&str); 2381 } else { 2382 // Fall through control 2383 successors = block->successors(&str, NULL, NULL); 2384 } 2385 2386 // Save set of locals defined in this block 2387 block->def_locals()->add(state->def_locals()); 2388 2389 // Remove untaken exception paths 2390 if (!exceptions_used) 2391 exceptions->clear(); 2392 2393 // Pass our state to successors. 2394 flow_successors(successors, state); 2395 } 2396 2397 // ------------------------------------------------------------------ 2398 // ciTypeFlow::PostOrderLoops::next 2399 // 2400 // Advance to next loop tree using a postorder, left-to-right traversal. 2401 void ciTypeFlow::PostorderLoops::next() { 2402 assert(!done(), "must not be done."); 2403 if (_current->sibling() != NULL) { 2404 _current = _current->sibling(); 2405 while (_current->child() != NULL) { 2406 _current = _current->child(); 2407 } 2408 } else { 2409 _current = _current->parent(); 2410 } 2411 } 2412 2413 // ------------------------------------------------------------------ 2414 // ciTypeFlow::PreOrderLoops::next 2415 // 2416 // Advance to next loop tree using a preorder, left-to-right traversal. 2417 void ciTypeFlow::PreorderLoops::next() { 2418 assert(!done(), "must not be done."); 2419 if (_current->child() != NULL) { 2420 _current = _current->child(); 2421 } else if (_current->sibling() != NULL) { 2422 _current = _current->sibling(); 2423 } else { 2424 while (_current != _root && _current->sibling() == NULL) { 2425 _current = _current->parent(); 2426 } 2427 if (_current == _root) { 2428 _current = NULL; 2429 assert(done(), "must be done."); 2430 } else { 2431 assert(_current->sibling() != NULL, "must be more to do"); 2432 _current = _current->sibling(); 2433 } 2434 } 2435 } 2436 2437 // ------------------------------------------------------------------ 2438 // ciTypeFlow::Loop::sorted_merge 2439 // 2440 // Merge the branch lp into this branch, sorting on the loop head 2441 // pre_orders. Returns the leaf of the merged branch. 2442 // Child and sibling pointers will be setup later. 2443 // Sort is (looking from leaf towards the root) 2444 // descending on primary key: loop head's pre_order, and 2445 // ascending on secondary key: loop tail's pre_order. 2446 ciTypeFlow::Loop* ciTypeFlow::Loop::sorted_merge(Loop* lp) { 2447 Loop* leaf = this; 2448 Loop* prev = NULL; 2449 Loop* current = leaf; 2450 while (lp != NULL) { 2451 int lp_pre_order = lp->head()->pre_order(); 2452 // Find insertion point for "lp" 2453 while (current != NULL) { 2454 if (current == lp) 2455 return leaf; // Already in list 2456 if (current->head()->pre_order() < lp_pre_order) 2457 break; 2458 if (current->head()->pre_order() == lp_pre_order && 2459 current->tail()->pre_order() > lp->tail()->pre_order()) { 2460 break; 2461 } 2462 prev = current; 2463 current = current->parent(); 2464 } 2465 Loop* next_lp = lp->parent(); // Save future list of items to insert 2466 // Insert lp before current 2467 lp->set_parent(current); 2468 if (prev != NULL) { 2469 prev->set_parent(lp); 2470 } else { 2471 leaf = lp; 2472 } 2473 prev = lp; // Inserted item is new prev[ious] 2474 lp = next_lp; // Next item to insert 2475 } 2476 return leaf; 2477 } 2478 2479 // ------------------------------------------------------------------ 2480 // ciTypeFlow::build_loop_tree 2481 // 2482 // Incrementally build loop tree. 2483 void ciTypeFlow::build_loop_tree(Block* blk) { 2484 assert(!blk->is_post_visited(), "precondition"); 2485 Loop* innermost = NULL; // merge of loop tree branches over all successors 2486 2487 for (SuccIter iter(blk); !iter.done(); iter.next()) { 2488 Loop* lp = NULL; 2489 Block* succ = iter.succ(); 2490 if (!succ->is_post_visited()) { 2491 // Found backedge since predecessor post visited, but successor is not 2492 assert(succ->pre_order() <= blk->pre_order(), "should be backedge"); 2493 2494 // Create a LoopNode to mark this loop. 2495 lp = new (arena()) Loop(succ, blk); 2496 if (succ->loop() == NULL) 2497 succ->set_loop(lp); 2498 // succ->loop will be updated to innermost loop on a later call, when blk==succ 2499 2500 } else { // Nested loop 2501 lp = succ->loop(); 2502 2503 // If succ is loop head, find outer loop. 2504 while (lp != NULL && lp->head() == succ) { 2505 lp = lp->parent(); 2506 } 2507 if (lp == NULL) { 2508 // Infinite loop, it's parent is the root 2509 lp = loop_tree_root(); 2510 } 2511 } 2512 2513 // Check for irreducible loop. 2514 // Successor has already been visited. If the successor's loop head 2515 // has already been post-visited, then this is another entry into the loop. 2516 while (lp->head()->is_post_visited() && lp != loop_tree_root()) { 2517 _has_irreducible_entry = true; 2518 lp->set_irreducible(succ); 2519 if (!succ->is_on_work_list()) { 2520 // Assume irreducible entries need more data flow 2521 add_to_work_list(succ); 2522 } 2523 Loop* plp = lp->parent(); 2524 if (plp == NULL) { 2525 // This only happens for some irreducible cases. The parent 2526 // will be updated during a later pass. 2527 break; 2528 } 2529 lp = plp; 2530 } 2531 2532 // Merge loop tree branch for all successors. 2533 innermost = innermost == NULL ? lp : innermost->sorted_merge(lp); 2534 2535 } // end loop 2536 2537 if (innermost == NULL) { 2538 assert(blk->successors()->length() == 0, "CFG exit"); 2539 blk->set_loop(loop_tree_root()); 2540 } else if (innermost->head() == blk) { 2541 // If loop header, complete the tree pointers 2542 if (blk->loop() != innermost) { 2543 #ifdef ASSERT 2544 assert(blk->loop()->head() == innermost->head(), "same head"); 2545 Loop* dl; 2546 for (dl = innermost; dl != NULL && dl != blk->loop(); dl = dl->parent()); 2547 assert(dl == blk->loop(), "blk->loop() already in innermost list"); 2548 #endif 2549 blk->set_loop(innermost); 2550 } 2551 innermost->def_locals()->add(blk->def_locals()); 2552 Loop* l = innermost; 2553 Loop* p = l->parent(); 2554 while (p && l->head() == blk) { 2555 l->set_sibling(p->child()); // Put self on parents 'next child' 2556 p->set_child(l); // Make self the first child of parent 2557 p->def_locals()->add(l->def_locals()); 2558 l = p; // Walk up the parent chain 2559 p = l->parent(); 2560 } 2561 } else { 2562 blk->set_loop(innermost); 2563 innermost->def_locals()->add(blk->def_locals()); 2564 } 2565 } 2566 2567 // ------------------------------------------------------------------ 2568 // ciTypeFlow::Loop::contains 2569 // 2570 // Returns true if lp is nested loop. 2571 bool ciTypeFlow::Loop::contains(ciTypeFlow::Loop* lp) const { 2572 assert(lp != NULL, ""); 2573 if (this == lp || head() == lp->head()) return true; 2574 int depth1 = depth(); 2575 int depth2 = lp->depth(); 2576 if (depth1 > depth2) 2577 return false; 2578 while (depth1 < depth2) { 2579 depth2--; 2580 lp = lp->parent(); 2581 } 2582 return this == lp; 2583 } 2584 2585 // ------------------------------------------------------------------ 2586 // ciTypeFlow::Loop::depth 2587 // 2588 // Loop depth 2589 int ciTypeFlow::Loop::depth() const { 2590 int dp = 0; 2591 for (Loop* lp = this->parent(); lp != NULL; lp = lp->parent()) 2592 dp++; 2593 return dp; 2594 } 2595 2596 #ifndef PRODUCT 2597 // ------------------------------------------------------------------ 2598 // ciTypeFlow::Loop::print 2599 void ciTypeFlow::Loop::print(outputStream* st, int indent) const { 2600 for (int i = 0; i < indent; i++) st->print(" "); 2601 st->print("%d<-%d %s", 2602 is_root() ? 0 : this->head()->pre_order(), 2603 is_root() ? 0 : this->tail()->pre_order(), 2604 is_irreducible()?" irr":""); 2605 st->print(" defs: "); 2606 def_locals()->print_on(st, _head->outer()->method()->max_locals()); 2607 st->cr(); 2608 for (Loop* ch = child(); ch != NULL; ch = ch->sibling()) 2609 ch->print(st, indent+2); 2610 } 2611 #endif 2612 2613 // ------------------------------------------------------------------ 2614 // ciTypeFlow::df_flow_types 2615 // 2616 // Perform the depth first type flow analysis. Helper for flow_types. 2617 void ciTypeFlow::df_flow_types(Block* start, 2618 bool do_flow, 2619 StateVector* temp_vector, 2620 JsrSet* temp_set) { 2621 int dft_len = 100; 2622 GrowableArray<Block*> stk(dft_len); 2623 2624 ciBlock* dummy = _methodBlocks->make_dummy_block(); 2625 JsrSet* root_set = new JsrSet(NULL, 0); 2626 Block* root_head = new (arena()) Block(this, dummy, root_set); 2627 Block* root_tail = new (arena()) Block(this, dummy, root_set); 2628 root_head->set_pre_order(0); 2629 root_head->set_post_order(0); 2630 root_tail->set_pre_order(max_jint); 2631 root_tail->set_post_order(max_jint); 2632 set_loop_tree_root(new (arena()) Loop(root_head, root_tail)); 2633 2634 stk.push(start); 2635 2636 _next_pre_order = 0; // initialize pre_order counter 2637 _rpo_list = NULL; 2638 int next_po = 0; // initialize post_order counter 2639 2640 // Compute RPO and the control flow graph 2641 int size; 2642 while ((size = stk.length()) > 0) { 2643 Block* blk = stk.top(); // Leave node on stack 2644 if (!blk->is_visited()) { 2645 // forward arc in graph 2646 assert (!blk->has_pre_order(), ""); 2647 blk->set_next_pre_order(); 2648 2649 if (_next_pre_order >= MaxNodeLimit / 2) { 2650 // Too many basic blocks. Bail out. 2651 // This can happen when try/finally constructs are nested to depth N, 2652 // and there is O(2**N) cloning of jsr bodies. See bug 4697245! 2653 // "MaxNodeLimit / 2" is used because probably the parser will 2654 // generate at least twice that many nodes and bail out. 2655 record_failure("too many basic blocks"); 2656 return; 2657 } 2658 if (do_flow) { 2659 flow_block(blk, temp_vector, temp_set); 2660 if (failing()) return; // Watch for bailouts. 2661 } 2662 } else if (!blk->is_post_visited()) { 2663 // cross or back arc 2664 for (SuccIter iter(blk); !iter.done(); iter.next()) { 2665 Block* succ = iter.succ(); 2666 if (!succ->is_visited()) { 2667 stk.push(succ); 2668 } 2669 } 2670 if (stk.length() == size) { 2671 // There were no additional children, post visit node now 2672 stk.pop(); // Remove node from stack 2673 2674 build_loop_tree(blk); 2675 blk->set_post_order(next_po++); // Assign post order 2676 prepend_to_rpo_list(blk); 2677 assert(blk->is_post_visited(), ""); 2678 2679 if (blk->is_loop_head() && !blk->is_on_work_list()) { 2680 // Assume loop heads need more data flow 2681 add_to_work_list(blk); 2682 } 2683 } 2684 } else { 2685 stk.pop(); // Remove post-visited node from stack 2686 } 2687 } 2688 } 2689 2690 // ------------------------------------------------------------------ 2691 // ciTypeFlow::flow_types 2692 // 2693 // Perform the type flow analysis, creating and cloning Blocks as 2694 // necessary. 2695 void ciTypeFlow::flow_types() { 2696 ResourceMark rm; 2697 StateVector* temp_vector = new StateVector(this); 2698 JsrSet* temp_set = new JsrSet(NULL, 16); 2699 2700 // Create the method entry block. 2701 Block* start = block_at(start_bci(), temp_set); 2702 2703 // Load the initial state into it. 2704 const StateVector* start_state = get_start_state(); 2705 if (failing()) return; 2706 start->meet(start_state); 2707 2708 // Depth first visit 2709 df_flow_types(start, true /*do flow*/, temp_vector, temp_set); 2710 2711 if (failing()) return; 2712 assert(_rpo_list == start, "must be start"); 2713 2714 // Any loops found? 2715 if (loop_tree_root()->child() != NULL && 2716 env()->comp_level() >= CompLevel_full_optimization) { 2717 // Loop optimizations are not performed on Tier1 compiles. 2718 2719 bool changed = clone_loop_heads(loop_tree_root(), temp_vector, temp_set); 2720 2721 // If some loop heads were cloned, recompute postorder and loop tree 2722 if (changed) { 2723 loop_tree_root()->set_child(NULL); 2724 for (Block* blk = _rpo_list; blk != NULL;) { 2725 Block* next = blk->rpo_next(); 2726 blk->df_init(); 2727 blk = next; 2728 } 2729 df_flow_types(start, false /*no flow*/, temp_vector, temp_set); 2730 } 2731 } 2732 2733 if (CITraceTypeFlow) { 2734 tty->print_cr("\nLoop tree"); 2735 loop_tree_root()->print(); 2736 } 2737 2738 // Continue flow analysis until fixed point reached 2739 2740 debug_only(int max_block = _next_pre_order;) 2741 2742 while (!work_list_empty()) { 2743 Block* blk = work_list_next(); 2744 assert (blk->has_post_order(), "post order assigned above"); 2745 2746 flow_block(blk, temp_vector, temp_set); 2747 2748 assert (max_block == _next_pre_order, "no new blocks"); 2749 assert (!failing(), "no more bailouts"); 2750 } 2751 } 2752 2753 // ------------------------------------------------------------------ 2754 // ciTypeFlow::map_blocks 2755 // 2756 // Create the block map, which indexes blocks in reverse post-order. 2757 void ciTypeFlow::map_blocks() { 2758 assert(_block_map == NULL, "single initialization"); 2759 int block_ct = _next_pre_order; 2760 _block_map = NEW_ARENA_ARRAY(arena(), Block*, block_ct); 2761 assert(block_ct == block_count(), ""); 2762 2763 Block* blk = _rpo_list; 2764 for (int m = 0; m < block_ct; m++) { 2765 int rpo = blk->rpo(); 2766 assert(rpo == m, "should be sequential"); 2767 _block_map[rpo] = blk; 2768 blk = blk->rpo_next(); 2769 } 2770 assert(blk == NULL, "should be done"); 2771 2772 for (int j = 0; j < block_ct; j++) { 2773 assert(_block_map[j] != NULL, "must not drop any blocks"); 2774 Block* block = _block_map[j]; 2775 // Remove dead blocks from successor lists: 2776 for (int e = 0; e <= 1; e++) { 2777 GrowableArray<Block*>* l = e? block->exceptions(): block->successors(); 2778 for (int k = 0; k < l->length(); k++) { 2779 Block* s = l->at(k); 2780 if (!s->has_post_order()) { 2781 if (CITraceTypeFlow) { 2782 tty->print("Removing dead %s successor of #%d: ", (e? "exceptional": "normal"), block->pre_order()); 2783 s->print_value_on(tty); 2784 tty->cr(); 2785 } 2786 l->remove(s); 2787 --k; 2788 } 2789 } 2790 } 2791 } 2792 } 2793 2794 // ------------------------------------------------------------------ 2795 // ciTypeFlow::get_block_for 2796 // 2797 // Find a block with this ciBlock which has a compatible JsrSet. 2798 // If no such block exists, create it, unless the option is no_create. 2799 // If the option is create_backedge_copy, always create a fresh backedge copy. 2800 ciTypeFlow::Block* ciTypeFlow::get_block_for(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs, CreateOption option) { 2801 Arena* a = arena(); 2802 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex]; 2803 if (blocks == NULL) { 2804 // Query only? 2805 if (option == no_create) return NULL; 2806 2807 // Allocate the growable array. 2808 blocks = new (a) GrowableArray<Block*>(a, 4, 0, NULL); 2809 _idx_to_blocklist[ciBlockIndex] = blocks; 2810 } 2811 2812 if (option != create_backedge_copy) { 2813 int len = blocks->length(); 2814 for (int i = 0; i < len; i++) { 2815 Block* block = blocks->at(i); 2816 if (!block->is_backedge_copy() && block->is_compatible_with(jsrs)) { 2817 return block; 2818 } 2819 } 2820 } 2821 2822 // Query only? 2823 if (option == no_create) return NULL; 2824 2825 // We did not find a compatible block. Create one. 2826 Block* new_block = new (a) Block(this, _methodBlocks->block(ciBlockIndex), jsrs); 2827 if (option == create_backedge_copy) new_block->set_backedge_copy(true); 2828 blocks->append(new_block); 2829 return new_block; 2830 } 2831 2832 // ------------------------------------------------------------------ 2833 // ciTypeFlow::backedge_copy_count 2834 // 2835 int ciTypeFlow::backedge_copy_count(int ciBlockIndex, ciTypeFlow::JsrSet* jsrs) const { 2836 GrowableArray<Block*>* blocks = _idx_to_blocklist[ciBlockIndex]; 2837 2838 if (blocks == NULL) { 2839 return 0; 2840 } 2841 2842 int count = 0; 2843 int len = blocks->length(); 2844 for (int i = 0; i < len; i++) { 2845 Block* block = blocks->at(i); 2846 if (block->is_backedge_copy() && block->is_compatible_with(jsrs)) { 2847 count++; 2848 } 2849 } 2850 2851 return count; 2852 } 2853 2854 // ------------------------------------------------------------------ 2855 // ciTypeFlow::do_flow 2856 // 2857 // Perform type inference flow analysis. 2858 void ciTypeFlow::do_flow() { 2859 if (CITraceTypeFlow) { 2860 tty->print_cr("\nPerforming flow analysis on method"); 2861 method()->print(); 2862 if (is_osr_flow()) tty->print(" at OSR bci %d", start_bci()); 2863 tty->cr(); 2864 method()->print_codes(); 2865 } 2866 if (CITraceTypeFlow) { 2867 tty->print_cr("Initial CI Blocks"); 2868 print_on(tty); 2869 } 2870 flow_types(); 2871 // Watch for bailouts. 2872 if (failing()) { 2873 return; 2874 } 2875 2876 map_blocks(); 2877 2878 if (CIPrintTypeFlow || CITraceTypeFlow) { 2879 rpo_print_on(tty); 2880 } 2881 } 2882 2883 // ------------------------------------------------------------------ 2884 // ciTypeFlow::record_failure() 2885 // The ciTypeFlow object keeps track of failure reasons separately from the ciEnv. 2886 // This is required because there is not a 1-1 relation between the ciEnv and 2887 // the TypeFlow passes within a compilation task. For example, if the compiler 2888 // is considering inlining a method, it will request a TypeFlow. If that fails, 2889 // the compilation as a whole may continue without the inlining. Some TypeFlow 2890 // requests are not optional; if they fail the requestor is responsible for 2891 // copying the failure reason up to the ciEnv. (See Parse::Parse.) 2892 void ciTypeFlow::record_failure(const char* reason) { 2893 if (env()->log() != NULL) { 2894 env()->log()->elem("failure reason='%s' phase='typeflow'", reason); 2895 } 2896 if (_failure_reason == NULL) { 2897 // Record the first failure reason. 2898 _failure_reason = reason; 2899 } 2900 } 2901 2902 #ifndef PRODUCT 2903 // ------------------------------------------------------------------ 2904 // ciTypeFlow::print_on 2905 void ciTypeFlow::print_on(outputStream* st) const { 2906 // Walk through CI blocks 2907 st->print_cr("********************************************************"); 2908 st->print ("TypeFlow for "); 2909 method()->name()->print_symbol_on(st); 2910 int limit_bci = code_size(); 2911 st->print_cr(" %d bytes", limit_bci); 2912 ciMethodBlocks *mblks = _methodBlocks; 2913 ciBlock* current = NULL; 2914 for (int bci = 0; bci < limit_bci; bci++) { 2915 ciBlock* blk = mblks->block_containing(bci); 2916 if (blk != NULL && blk != current) { 2917 current = blk; 2918 current->print_on(st); 2919 2920 GrowableArray<Block*>* blocks = _idx_to_blocklist[blk->index()]; 2921 int num_blocks = (blocks == NULL) ? 0 : blocks->length(); 2922 2923 if (num_blocks == 0) { 2924 st->print_cr(" No Blocks"); 2925 } else { 2926 for (int i = 0; i < num_blocks; i++) { 2927 Block* block = blocks->at(i); 2928 block->print_on(st); 2929 } 2930 } 2931 st->print_cr("--------------------------------------------------------"); 2932 st->cr(); 2933 } 2934 } 2935 st->print_cr("********************************************************"); 2936 st->cr(); 2937 } 2938 2939 void ciTypeFlow::rpo_print_on(outputStream* st) const { 2940 st->print_cr("********************************************************"); 2941 st->print ("TypeFlow for "); 2942 method()->name()->print_symbol_on(st); 2943 int limit_bci = code_size(); 2944 st->print_cr(" %d bytes", limit_bci); 2945 for (Block* blk = _rpo_list; blk != NULL; blk = blk->rpo_next()) { 2946 blk->print_on(st); 2947 st->print_cr("--------------------------------------------------------"); 2948 st->cr(); 2949 } 2950 st->print_cr("********************************************************"); 2951 st->cr(); 2952 } 2953 #endif