1 /* 2 * Copyright (c) 2015, 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 "opto/arraycopynode.hpp" 27 #include "opto/graphKit.hpp" 28 29 ArrayCopyNode::ArrayCopyNode(Compile* C, bool alloc_tightly_coupled) 30 : CallNode(arraycopy_type(), NULL, TypeRawPtr::BOTTOM), 31 _alloc_tightly_coupled(alloc_tightly_coupled), 32 _kind(None), 33 _arguments_validated(false), 34 _src_type(TypeOopPtr::BOTTOM), 35 _dest_type(TypeOopPtr::BOTTOM) { 36 init_class_id(Class_ArrayCopy); 37 init_flags(Flag_is_macro); 38 C->add_macro_node(this); 39 } 40 41 uint ArrayCopyNode::size_of() const { return sizeof(*this); } 42 43 ArrayCopyNode* ArrayCopyNode::make(GraphKit* kit, bool may_throw, 44 Node* src, Node* src_offset, 45 Node* dest, Node* dest_offset, 46 Node* length, 47 bool alloc_tightly_coupled, 48 Node* src_klass, Node* dest_klass, 49 Node* src_length, Node* dest_length) { 50 51 ArrayCopyNode* ac = new ArrayCopyNode(kit->C, alloc_tightly_coupled); 52 Node* prev_mem = kit->set_predefined_input_for_runtime_call(ac); 53 54 ac->init_req(ArrayCopyNode::Src, src); 55 ac->init_req(ArrayCopyNode::SrcPos, src_offset); 56 ac->init_req(ArrayCopyNode::Dest, dest); 57 ac->init_req(ArrayCopyNode::DestPos, dest_offset); 58 ac->init_req(ArrayCopyNode::Length, length); 59 ac->init_req(ArrayCopyNode::SrcLen, src_length); 60 ac->init_req(ArrayCopyNode::DestLen, dest_length); 61 ac->init_req(ArrayCopyNode::SrcKlass, src_klass); 62 ac->init_req(ArrayCopyNode::DestKlass, dest_klass); 63 64 if (may_throw) { 65 ac->set_req(TypeFunc::I_O , kit->i_o()); 66 kit->add_safepoint_edges(ac, false); 67 } 68 69 return ac; 70 } 71 72 void ArrayCopyNode::connect_outputs(GraphKit* kit) { 73 kit->set_all_memory_call(this, true); 74 kit->set_control(kit->gvn().transform(new ProjNode(this,TypeFunc::Control))); 75 kit->set_i_o(kit->gvn().transform(new ProjNode(this, TypeFunc::I_O))); 76 kit->make_slow_call_ex(this, kit->env()->Throwable_klass(), true); 77 kit->set_all_memory_call(this); 78 } 79 80 #ifndef PRODUCT 81 const char* ArrayCopyNode::_kind_names[] = {"arraycopy", "arraycopy, validated arguments", "clone", "oop array clone", "CopyOf", "CopyOfRange"}; 82 83 void ArrayCopyNode::dump_spec(outputStream *st) const { 84 CallNode::dump_spec(st); 85 st->print(" (%s%s)", _kind_names[_kind], _alloc_tightly_coupled ? ", tightly coupled allocation" : ""); 86 } 87 88 void ArrayCopyNode::dump_compact_spec(outputStream* st) const { 89 st->print("%s%s", _kind_names[_kind], _alloc_tightly_coupled ? ",tight" : ""); 90 } 91 #endif 92 93 intptr_t ArrayCopyNode::get_length_if_constant(PhaseGVN *phase) const { 94 // check that length is constant 95 Node* length = in(ArrayCopyNode::Length); 96 const Type* length_type = phase->type(length); 97 98 if (length_type == Type::TOP) { 99 return -1; 100 } 101 102 assert(is_clonebasic() || is_arraycopy() || is_copyof() || is_copyofrange(), "unexpected array copy type"); 103 104 return is_clonebasic() ? length->find_intptr_t_con(-1) : length->find_int_con(-1); 105 } 106 107 int ArrayCopyNode::get_count(PhaseGVN *phase) const { 108 Node* src = in(ArrayCopyNode::Src); 109 const Type* src_type = phase->type(src); 110 111 if (is_clonebasic()) { 112 if (src_type->isa_instptr()) { 113 const TypeInstPtr* inst_src = src_type->is_instptr(); 114 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass(); 115 // ciInstanceKlass::nof_nonstatic_fields() doesn't take injected 116 // fields into account. They are rare anyway so easier to simply 117 // skip instances with injected fields. 118 if ((!inst_src->klass_is_exact() && (ik->is_interface() || ik->has_subklass())) || ik->has_injected_fields()) { 119 return -1; 120 } 121 int nb_fields = ik->nof_nonstatic_fields(); 122 return nb_fields; 123 } else { 124 const TypeAryPtr* ary_src = src_type->isa_aryptr(); 125 assert (ary_src != NULL, "not an array or instance?"); 126 // clone passes a length as a rounded number of longs. If we're 127 // cloning an array we'll do it element by element. If the 128 // length input to ArrayCopyNode is constant, length of input 129 // array must be too. 130 131 assert((get_length_if_constant(phase) == -1) == !ary_src->size()->is_con() || 132 phase->is_IterGVN(), "inconsistent"); 133 134 if (ary_src->size()->is_con()) { 135 return ary_src->size()->get_con(); 136 } 137 return -1; 138 } 139 } 140 141 return get_length_if_constant(phase); 142 } 143 144 Node* ArrayCopyNode::try_clone_instance(PhaseGVN *phase, bool can_reshape, int count) { 145 if (!is_clonebasic()) { 146 return NULL; 147 } 148 149 Node* src = in(ArrayCopyNode::Src); 150 Node* dest = in(ArrayCopyNode::Dest); 151 Node* ctl = in(TypeFunc::Control); 152 Node* in_mem = in(TypeFunc::Memory); 153 154 const Type* src_type = phase->type(src); 155 156 assert(src->is_AddP(), "should be base + off"); 157 assert(dest->is_AddP(), "should be base + off"); 158 Node* base_src = src->in(AddPNode::Base); 159 Node* base_dest = dest->in(AddPNode::Base); 160 161 MergeMemNode* mem = MergeMemNode::make(in_mem); 162 163 const TypeInstPtr* inst_src = src_type->isa_instptr(); 164 165 if (inst_src == NULL) { 166 return NULL; 167 } 168 169 if (!inst_src->klass_is_exact()) { 170 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass(); 171 assert(!ik->is_interface() && !ik->has_subklass(), "inconsistent klass hierarchy"); 172 phase->C->dependencies()->assert_leaf_type(ik); 173 } 174 175 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass(); 176 assert(ik->nof_nonstatic_fields() <= ArrayCopyLoadStoreMaxElem, "too many fields"); 177 178 for (int i = 0; i < count; i++) { 179 ciField* field = ik->nonstatic_field_at(i); 180 int fieldidx = phase->C->alias_type(field)->index(); 181 const TypePtr* adr_type = phase->C->alias_type(field)->adr_type(); 182 Node* off = phase->MakeConX(field->offset()); 183 Node* next_src = phase->transform(new AddPNode(base_src,base_src,off)); 184 Node* next_dest = phase->transform(new AddPNode(base_dest,base_dest,off)); 185 BasicType bt = field->layout_type(); 186 187 const Type *type; 188 if (bt == T_OBJECT) { 189 if (!field->type()->is_loaded()) { 190 type = TypeInstPtr::BOTTOM; 191 } else { 192 ciType* field_klass = field->type(); 193 type = TypeOopPtr::make_from_klass(field_klass->as_klass()); 194 } 195 } else { 196 type = Type::get_const_basic_type(bt); 197 } 198 199 Node* v = LoadNode::make(*phase, ctl, mem->memory_at(fieldidx), next_src, adr_type, type, bt, MemNode::unordered); 200 v = phase->transform(v); 201 Node* s = StoreNode::make(*phase, ctl, mem->memory_at(fieldidx), next_dest, adr_type, v, bt, MemNode::unordered); 202 s = phase->transform(s); 203 mem->set_memory_at(fieldidx, s); 204 } 205 206 if (!finish_transform(phase, can_reshape, ctl, mem)) { 207 return NULL; 208 } 209 210 return mem; 211 } 212 213 bool ArrayCopyNode::prepare_array_copy(PhaseGVN *phase, bool can_reshape, 214 Node*& adr_src, 215 Node*& base_src, 216 Node*& adr_dest, 217 Node*& base_dest, 218 BasicType& copy_type, 219 const Type*& value_type, 220 bool& disjoint_bases) { 221 Node* src = in(ArrayCopyNode::Src); 222 Node* dest = in(ArrayCopyNode::Dest); 223 const Type* src_type = phase->type(src); 224 const TypeAryPtr* ary_src = src_type->isa_aryptr(); 225 226 if (is_arraycopy() || is_copyofrange() || is_copyof()) { 227 const Type* dest_type = phase->type(dest); 228 const TypeAryPtr* ary_dest = dest_type->isa_aryptr(); 229 Node* src_offset = in(ArrayCopyNode::SrcPos); 230 Node* dest_offset = in(ArrayCopyNode::DestPos); 231 232 // newly allocated object is guaranteed to not overlap with source object 233 disjoint_bases = is_alloc_tightly_coupled(); 234 235 if (ary_src == NULL || ary_src->klass() == NULL || 236 ary_dest == NULL || ary_dest->klass() == NULL) { 237 // We don't know if arguments are arrays 238 return false; 239 } 240 241 BasicType src_elem = ary_src->klass()->as_array_klass()->element_type()->basic_type(); 242 BasicType dest_elem = ary_dest->klass()->as_array_klass()->element_type()->basic_type(); 243 if (src_elem == T_ARRAY) src_elem = T_OBJECT; 244 if (dest_elem == T_ARRAY) dest_elem = T_OBJECT; 245 246 if (src_elem != dest_elem || dest_elem == T_VOID) { 247 // We don't know if arguments are arrays of the same type 248 return false; 249 } 250 251 if (dest_elem == T_OBJECT && (!is_alloc_tightly_coupled() || !GraphKit::use_ReduceInitialCardMarks())) { 252 // It's an object array copy but we can't emit the card marking 253 // that is needed 254 return false; 255 } 256 257 value_type = ary_src->elem(); 258 259 base_src = src; 260 base_dest = dest; 261 262 uint shift = exact_log2(type2aelembytes(dest_elem)); 263 uint header = arrayOopDesc::base_offset_in_bytes(dest_elem); 264 265 adr_src = src; 266 adr_dest = dest; 267 268 src_offset = Compile::conv_I2X_index(phase, src_offset, ary_src->size()); 269 dest_offset = Compile::conv_I2X_index(phase, dest_offset, ary_dest->size()); 270 271 Node* src_scale = phase->transform(new LShiftXNode(src_offset, phase->intcon(shift))); 272 Node* dest_scale = phase->transform(new LShiftXNode(dest_offset, phase->intcon(shift))); 273 274 adr_src = phase->transform(new AddPNode(base_src, adr_src, src_scale)); 275 adr_dest = phase->transform(new AddPNode(base_dest, adr_dest, dest_scale)); 276 277 adr_src = new AddPNode(base_src, adr_src, phase->MakeConX(header)); 278 adr_dest = new AddPNode(base_dest, adr_dest, phase->MakeConX(header)); 279 280 adr_src = phase->transform(adr_src); 281 adr_dest = phase->transform(adr_dest); 282 283 copy_type = dest_elem; 284 } else { 285 assert (is_clonebasic(), "should be"); 286 287 disjoint_bases = true; 288 assert(src->is_AddP(), "should be base + off"); 289 assert(dest->is_AddP(), "should be base + off"); 290 adr_src = src; 291 base_src = src->in(AddPNode::Base); 292 adr_dest = dest; 293 base_dest = dest->in(AddPNode::Base); 294 295 assert(phase->type(src->in(AddPNode::Offset))->is_intptr_t()->get_con() == phase->type(dest->in(AddPNode::Offset))->is_intptr_t()->get_con(), "same start offset?"); 296 BasicType elem = ary_src->klass()->as_array_klass()->element_type()->basic_type(); 297 if (elem == T_ARRAY) elem = T_OBJECT; 298 299 int diff = arrayOopDesc::base_offset_in_bytes(elem) - phase->type(src->in(AddPNode::Offset))->is_intptr_t()->get_con(); 300 assert(diff >= 0, "clone should not start after 1st array element"); 301 if (diff > 0) { 302 adr_src = phase->transform(new AddPNode(base_src, adr_src, phase->MakeConX(diff))); 303 adr_dest = phase->transform(new AddPNode(base_dest, adr_dest, phase->MakeConX(diff))); 304 } 305 306 copy_type = elem; 307 value_type = ary_src->elem(); 308 } 309 return true; 310 } 311 312 const TypePtr* ArrayCopyNode::get_address_type(PhaseGVN *phase, Node* n) { 313 const Type* at = phase->type(n); 314 assert(at != Type::TOP, "unexpected type"); 315 const TypePtr* atp = at->isa_ptr(); 316 // adjust atp to be the correct array element address type 317 atp = atp->add_offset(Type::OffsetBot); 318 return atp; 319 } 320 321 void ArrayCopyNode::array_copy_test_overlap(PhaseGVN *phase, bool can_reshape, bool disjoint_bases, int count, Node*& forward_ctl, Node*& backward_ctl) { 322 Node* ctl = in(TypeFunc::Control); 323 if (!disjoint_bases && count > 1) { 324 Node* src_offset = in(ArrayCopyNode::SrcPos); 325 Node* dest_offset = in(ArrayCopyNode::DestPos); 326 assert(src_offset != NULL && dest_offset != NULL, "should be"); 327 Node* cmp = phase->transform(new CmpINode(src_offset, dest_offset)); 328 Node *bol = phase->transform(new BoolNode(cmp, BoolTest::lt)); 329 IfNode *iff = new IfNode(ctl, bol, PROB_FAIR, COUNT_UNKNOWN); 330 331 phase->transform(iff); 332 333 forward_ctl = phase->transform(new IfFalseNode(iff)); 334 backward_ctl = phase->transform(new IfTrueNode(iff)); 335 } else { 336 forward_ctl = ctl; 337 } 338 } 339 340 Node* ArrayCopyNode::array_copy_forward(PhaseGVN *phase, 341 bool can_reshape, 342 Node* forward_ctl, 343 Node* start_mem_src, 344 Node* start_mem_dest, 345 const TypePtr* atp_src, 346 const TypePtr* atp_dest, 347 Node* adr_src, 348 Node* base_src, 349 Node* adr_dest, 350 Node* base_dest, 351 BasicType copy_type, 352 const Type* value_type, 353 int count) { 354 Node* mem = phase->C->top(); 355 if (!forward_ctl->is_top()) { 356 // copy forward 357 mem = start_mem_dest; 358 359 if (count > 0) { 360 Node* v = LoadNode::make(*phase, forward_ctl, start_mem_src, adr_src, atp_src, value_type, copy_type, MemNode::unordered); 361 v = phase->transform(v); 362 mem = StoreNode::make(*phase, forward_ctl, mem, adr_dest, atp_dest, v, copy_type, MemNode::unordered); 363 mem = phase->transform(mem); 364 for (int i = 1; i < count; i++) { 365 Node* off = phase->MakeConX(type2aelembytes(copy_type) * i); 366 Node* next_src = phase->transform(new AddPNode(base_src,adr_src,off)); 367 Node* next_dest = phase->transform(new AddPNode(base_dest,adr_dest,off)); 368 v = LoadNode::make(*phase, forward_ctl, mem, next_src, atp_src, value_type, copy_type, MemNode::unordered); 369 v = phase->transform(v); 370 mem = StoreNode::make(*phase, forward_ctl,mem,next_dest,atp_dest,v, copy_type, MemNode::unordered); 371 mem = phase->transform(mem); 372 } 373 } else if(can_reshape) { 374 PhaseIterGVN* igvn = phase->is_IterGVN(); 375 igvn->_worklist.push(adr_src); 376 igvn->_worklist.push(adr_dest); 377 } 378 } 379 return mem; 380 } 381 382 Node* ArrayCopyNode::array_copy_backward(PhaseGVN *phase, 383 bool can_reshape, 384 Node* backward_ctl, 385 Node* start_mem_src, 386 Node* start_mem_dest, 387 const TypePtr* atp_src, 388 const TypePtr* atp_dest, 389 Node* adr_src, 390 Node* base_src, 391 Node* adr_dest, 392 Node* base_dest, 393 BasicType copy_type, 394 const Type* value_type, 395 int count) { 396 Node* mem = phase->C->top(); 397 if (!backward_ctl->is_top()) { 398 // copy backward 399 mem = start_mem_dest; 400 401 if (count > 0) { 402 for (int i = count-1; i >= 1; i--) { 403 Node* off = phase->MakeConX(type2aelembytes(copy_type) * i); 404 Node* next_src = phase->transform(new AddPNode(base_src,adr_src,off)); 405 Node* next_dest = phase->transform(new AddPNode(base_dest,adr_dest,off)); 406 Node* v = LoadNode::make(*phase, backward_ctl, mem, next_src, atp_src, value_type, copy_type, MemNode::unordered); 407 v = phase->transform(v); 408 mem = StoreNode::make(*phase, backward_ctl,mem,next_dest,atp_dest,v, copy_type, MemNode::unordered); 409 mem = phase->transform(mem); 410 } 411 Node* v = LoadNode::make(*phase, backward_ctl, mem, adr_src, atp_src, value_type, copy_type, MemNode::unordered); 412 v = phase->transform(v); 413 mem = StoreNode::make(*phase, backward_ctl, mem, adr_dest, atp_dest, v, copy_type, MemNode::unordered); 414 mem = phase->transform(mem); 415 } else if(can_reshape) { 416 PhaseIterGVN* igvn = phase->is_IterGVN(); 417 igvn->_worklist.push(adr_src); 418 igvn->_worklist.push(adr_dest); 419 } 420 } 421 return mem; 422 } 423 424 bool ArrayCopyNode::finish_transform(PhaseGVN *phase, bool can_reshape, 425 Node* ctl, Node *mem) { 426 if (can_reshape) { 427 PhaseIterGVN* igvn = phase->is_IterGVN(); 428 igvn->set_delay_transform(false); 429 if (is_clonebasic()) { 430 Node* out_mem = proj_out(TypeFunc::Memory); 431 432 if (out_mem->outcnt() != 1 || !out_mem->raw_out(0)->is_MergeMem() || 433 out_mem->raw_out(0)->outcnt() != 1 || !out_mem->raw_out(0)->raw_out(0)->is_MemBar()) { 434 assert(!GraphKit::use_ReduceInitialCardMarks(), "can only happen with card marking"); 435 return false; 436 } 437 438 igvn->replace_node(out_mem->raw_out(0), mem); 439 440 Node* out_ctl = proj_out(TypeFunc::Control); 441 igvn->replace_node(out_ctl, ctl); 442 } else { 443 // replace fallthrough projections of the ArrayCopyNode by the 444 // new memory, control and the input IO. 445 CallProjections callprojs; 446 extract_projections(&callprojs, true, false); 447 448 if (callprojs.fallthrough_ioproj != NULL) { 449 igvn->replace_node(callprojs.fallthrough_ioproj, in(TypeFunc::I_O)); 450 } 451 if (callprojs.fallthrough_memproj != NULL) { 452 igvn->replace_node(callprojs.fallthrough_memproj, mem); 453 } 454 if (callprojs.fallthrough_catchproj != NULL) { 455 igvn->replace_node(callprojs.fallthrough_catchproj, ctl); 456 } 457 458 // The ArrayCopyNode is not disconnected. It still has the 459 // projections for the exception case. Replace current 460 // ArrayCopyNode with a dummy new one with a top() control so 461 // that this part of the graph stays consistent but is 462 // eventually removed. 463 464 set_req(0, phase->C->top()); 465 remove_dead_region(phase, can_reshape); 466 } 467 } else { 468 if (in(TypeFunc::Control) != ctl) { 469 // we can't return new memory and control from Ideal at parse time 470 assert(!is_clonebasic(), "added control for clone?"); 471 return false; 472 } 473 } 474 return true; 475 } 476 477 478 Node *ArrayCopyNode::Ideal(PhaseGVN *phase, bool can_reshape) { 479 if (remove_dead_region(phase, can_reshape)) return this; 480 481 if (StressArrayCopyMacroNode && !can_reshape) { 482 phase->record_for_igvn(this); 483 return NULL; 484 } 485 486 // See if it's a small array copy and we can inline it as 487 // loads/stores 488 // Here we can only do: 489 // - arraycopy if all arguments were validated before and we don't 490 // need card marking 491 // - clone for which we don't need to do card marking 492 493 if (!is_clonebasic() && !is_arraycopy_validated() && 494 !is_copyofrange_validated() && !is_copyof_validated()) { 495 return NULL; 496 } 497 498 assert(in(TypeFunc::Control) != NULL && 499 in(TypeFunc::Memory) != NULL && 500 in(ArrayCopyNode::Src) != NULL && 501 in(ArrayCopyNode::Dest) != NULL && 502 in(ArrayCopyNode::Length) != NULL && 503 ((in(ArrayCopyNode::SrcPos) != NULL && in(ArrayCopyNode::DestPos) != NULL) || 504 is_clonebasic()), "broken inputs"); 505 506 if (in(TypeFunc::Control)->is_top() || 507 in(TypeFunc::Memory)->is_top() || 508 phase->type(in(ArrayCopyNode::Src)) == Type::TOP || 509 phase->type(in(ArrayCopyNode::Dest)) == Type::TOP || 510 (in(ArrayCopyNode::SrcPos) != NULL && in(ArrayCopyNode::SrcPos)->is_top()) || 511 (in(ArrayCopyNode::DestPos) != NULL && in(ArrayCopyNode::DestPos)->is_top())) { 512 return NULL; 513 } 514 515 int count = get_count(phase); 516 517 if (count < 0 || count > ArrayCopyLoadStoreMaxElem) { 518 return NULL; 519 } 520 521 Node* mem = try_clone_instance(phase, can_reshape, count); 522 if (mem != NULL) { 523 return mem; 524 } 525 526 Node* adr_src = NULL; 527 Node* base_src = NULL; 528 Node* adr_dest = NULL; 529 Node* base_dest = NULL; 530 BasicType copy_type = T_ILLEGAL; 531 const Type* value_type = NULL; 532 bool disjoint_bases = false; 533 534 if (!prepare_array_copy(phase, can_reshape, 535 adr_src, base_src, adr_dest, base_dest, 536 copy_type, value_type, disjoint_bases)) { 537 return NULL; 538 } 539 540 Node* src = in(ArrayCopyNode::Src); 541 Node* dest = in(ArrayCopyNode::Dest); 542 const TypePtr* atp_src = get_address_type(phase, src); 543 const TypePtr* atp_dest = get_address_type(phase, dest); 544 uint alias_idx_src = phase->C->get_alias_index(atp_src); 545 uint alias_idx_dest = phase->C->get_alias_index(atp_dest); 546 547 Node *in_mem = in(TypeFunc::Memory); 548 Node *start_mem_src = in_mem; 549 Node *start_mem_dest = in_mem; 550 if (in_mem->is_MergeMem()) { 551 start_mem_src = in_mem->as_MergeMem()->memory_at(alias_idx_src); 552 start_mem_dest = in_mem->as_MergeMem()->memory_at(alias_idx_dest); 553 } 554 555 556 if (can_reshape) { 557 assert(!phase->is_IterGVN()->delay_transform(), "cannot delay transforms"); 558 phase->is_IterGVN()->set_delay_transform(true); 559 } 560 561 Node* backward_ctl = phase->C->top(); 562 Node* forward_ctl = phase->C->top(); 563 array_copy_test_overlap(phase, can_reshape, disjoint_bases, count, forward_ctl, backward_ctl); 564 565 Node* forward_mem = array_copy_forward(phase, can_reshape, forward_ctl, 566 start_mem_src, start_mem_dest, 567 atp_src, atp_dest, 568 adr_src, base_src, adr_dest, base_dest, 569 copy_type, value_type, count); 570 571 Node* backward_mem = array_copy_backward(phase, can_reshape, backward_ctl, 572 start_mem_src, start_mem_dest, 573 atp_src, atp_dest, 574 adr_src, base_src, adr_dest, base_dest, 575 copy_type, value_type, count); 576 577 Node* ctl = NULL; 578 if (!forward_ctl->is_top() && !backward_ctl->is_top()) { 579 ctl = new RegionNode(3); 580 mem = new PhiNode(ctl, Type::MEMORY, atp_dest); 581 ctl->init_req(1, forward_ctl); 582 mem->init_req(1, forward_mem); 583 ctl->init_req(2, backward_ctl); 584 mem->init_req(2, backward_mem); 585 ctl = phase->transform(ctl); 586 mem = phase->transform(mem); 587 } else if (!forward_ctl->is_top()) { 588 ctl = forward_ctl; 589 mem = forward_mem; 590 } else { 591 assert(!backward_ctl->is_top(), "no copy?"); 592 ctl = backward_ctl; 593 mem = backward_mem; 594 } 595 596 if (can_reshape) { 597 assert(phase->is_IterGVN()->delay_transform(), "should be delaying transforms"); 598 phase->is_IterGVN()->set_delay_transform(false); 599 } 600 601 MergeMemNode* out_mem = MergeMemNode::make(in_mem); 602 out_mem->set_memory_at(alias_idx_dest, mem); 603 mem = out_mem; 604 605 if (!finish_transform(phase, can_reshape, ctl, mem)) { 606 return NULL; 607 } 608 609 return mem; 610 } 611 612 bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) { 613 Node* dest = in(ArrayCopyNode::Dest); 614 if (dest->is_top()) { 615 return false; 616 } 617 const TypeOopPtr* dest_t = phase->type(dest)->is_oopptr(); 618 assert(!dest_t->is_known_instance() || _dest_type->is_known_instance(), "result of EA not recorded"); 619 assert(in(ArrayCopyNode::Src)->is_top() || !phase->type(in(ArrayCopyNode::Src))->is_oopptr()->is_known_instance() || 620 _src_type->is_known_instance(), "result of EA not recorded"); 621 622 if (_dest_type != TypeOopPtr::BOTTOM || t_oop->is_known_instance()) { 623 assert(_dest_type == TypeOopPtr::BOTTOM || _dest_type->is_known_instance(), "result of EA is known instance"); 624 return t_oop->instance_id() == _dest_type->instance_id(); 625 } 626 627 return CallNode::may_modify_arraycopy_helper(dest_t, t_oop, phase); 628 } 629 630 bool ArrayCopyNode::may_modify_helper(const TypeOopPtr *t_oop, Node* n, PhaseTransform *phase) { 631 if (n->is_Proj()) { 632 n = n->in(0); 633 if (n->is_Call() && n->as_Call()->may_modify(t_oop, phase)) { 634 return true; 635 } 636 } 637 return false; 638 } 639 640 bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, MemBarNode* mb, PhaseTransform *phase) { 641 Node* mem = mb->in(TypeFunc::Memory); 642 643 if (mem->is_MergeMem()) { 644 Node* n = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw); 645 if (may_modify_helper(t_oop, n, phase)) { 646 return true; 647 } else if (n->is_Phi()) { 648 for (uint i = 1; i < n->req(); i++) { 649 if (n->in(i) != NULL) { 650 if (may_modify_helper(t_oop, n->in(i), phase)) { 651 return true; 652 } 653 } 654 } 655 } 656 } 657 658 return false; 659 } 660 661 // Does this array copy modify offsets between offset_lo and offset_hi 662 // in the destination array 663 // if must_modify is false, return true if the copy could write 664 // between offset_lo and offset_hi 665 // if must_modify is true, return true if the copy is guaranteed to 666 // write between offset_lo and offset_hi 667 bool ArrayCopyNode::modifies(intptr_t offset_lo, intptr_t offset_hi, PhaseTransform* phase, bool must_modify) { 668 assert(_kind == ArrayCopy || _kind == CopyOf || _kind == CopyOfRange, "only for real array copies"); 669 670 Node* dest = in(ArrayCopyNode::Dest); 671 Node* src_pos = in(ArrayCopyNode::SrcPos); 672 Node* dest_pos = in(ArrayCopyNode::DestPos); 673 Node* len = in(ArrayCopyNode::Length); 674 675 const TypeInt *dest_pos_t = phase->type(dest_pos)->isa_int(); 676 const TypeInt *len_t = phase->type(len)->isa_int(); 677 const TypeAryPtr* ary_t = phase->type(dest)->isa_aryptr(); 678 679 if (dest_pos_t != NULL && len_t != NULL && ary_t != NULL) { 680 BasicType ary_elem = ary_t->klass()->as_array_klass()->element_type()->basic_type(); 681 uint header = arrayOopDesc::base_offset_in_bytes(ary_elem); 682 uint elemsize = type2aelembytes(ary_elem); 683 684 jlong dest_pos_plus_len_lo = (((jlong)dest_pos_t->_lo) + len_t->_lo) * elemsize + header; 685 jlong dest_pos_plus_len_hi = (((jlong)dest_pos_t->_hi) + len_t->_hi) * elemsize + header; 686 jlong dest_pos_lo = ((jlong)dest_pos_t->_lo) * elemsize + header; 687 jlong dest_pos_hi = ((jlong)dest_pos_t->_hi) * elemsize + header; 688 689 if (must_modify) { 690 if (offset_lo >= dest_pos_hi && offset_hi < dest_pos_plus_len_lo) { 691 return true; 692 } 693 } else { 694 if (offset_hi >= dest_pos_lo && offset_lo < dest_pos_plus_len_hi) { 695 return true; 696 } 697 } 698 } 699 return false; 700 }