1 /* 2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "gc/shared/barrierSet.hpp" 27 #include "gc/shared/c2/barrierSetC2.hpp" 28 #include "gc/shared/c2/cardTableBarrierSetC2.hpp" 29 #include "opto/arraycopynode.hpp" 30 #include "opto/graphKit.hpp" 31 #include "runtime/sharedRuntime.hpp" 32 #include "utilities/macros.hpp" 33 34 ArrayCopyNode::ArrayCopyNode(Compile* C, bool alloc_tightly_coupled, bool has_negative_length_guard) 35 : CallNode(arraycopy_type(), NULL, TypePtr::BOTTOM), 36 _kind(None), 37 _alloc_tightly_coupled(alloc_tightly_coupled), 38 _has_negative_length_guard(has_negative_length_guard), 39 _arguments_validated(false), 40 _src_type(TypeOopPtr::BOTTOM), 41 _dest_type(TypeOopPtr::BOTTOM) { 42 init_class_id(Class_ArrayCopy); 43 init_flags(Flag_is_macro); 44 C->add_macro_node(this); 45 } 46 47 uint ArrayCopyNode::size_of() const { return sizeof(*this); } 48 49 ArrayCopyNode* ArrayCopyNode::make(GraphKit* kit, bool may_throw, 50 Node* src, Node* src_offset, 51 Node* dest, Node* dest_offset, 52 Node* length, 53 bool alloc_tightly_coupled, 54 bool has_negative_length_guard, 55 Node* src_klass, Node* dest_klass, 56 Node* src_length, Node* dest_length) { 57 58 ArrayCopyNode* ac = new ArrayCopyNode(kit->C, alloc_tightly_coupled, has_negative_length_guard); 59 Node* prev_mem = kit->set_predefined_input_for_runtime_call(ac); 60 61 ac->init_req(ArrayCopyNode::Src, src); 62 ac->init_req(ArrayCopyNode::SrcPos, src_offset); 63 ac->init_req(ArrayCopyNode::Dest, dest); 64 ac->init_req(ArrayCopyNode::DestPos, dest_offset); 65 ac->init_req(ArrayCopyNode::Length, length); 66 ac->init_req(ArrayCopyNode::SrcLen, src_length); 67 ac->init_req(ArrayCopyNode::DestLen, dest_length); 68 ac->init_req(ArrayCopyNode::SrcKlass, src_klass); 69 ac->init_req(ArrayCopyNode::DestKlass, dest_klass); 70 71 if (may_throw) { 72 ac->set_req(TypeFunc::I_O , kit->i_o()); 73 kit->add_safepoint_edges(ac, false); 74 } 75 76 return ac; 77 } 78 79 void ArrayCopyNode::connect_outputs(GraphKit* kit) { 80 kit->set_all_memory_call(this, true); 81 kit->set_control(kit->gvn().transform(new ProjNode(this,TypeFunc::Control))); 82 kit->set_i_o(kit->gvn().transform(new ProjNode(this, TypeFunc::I_O))); 83 kit->make_slow_call_ex(this, kit->env()->Throwable_klass(), true); 84 kit->set_all_memory_call(this); 85 } 86 87 #ifndef PRODUCT 88 const char* ArrayCopyNode::_kind_names[] = {"arraycopy", "arraycopy, validated arguments", "clone", "oop array clone", "CopyOf", "CopyOfRange"}; 89 90 void ArrayCopyNode::dump_spec(outputStream *st) const { 91 CallNode::dump_spec(st); 92 st->print(" (%s%s)", _kind_names[_kind], _alloc_tightly_coupled ? ", tightly coupled allocation" : ""); 93 } 94 95 void ArrayCopyNode::dump_compact_spec(outputStream* st) const { 96 st->print("%s%s", _kind_names[_kind], _alloc_tightly_coupled ? ",tight" : ""); 97 } 98 #endif 99 100 intptr_t ArrayCopyNode::get_length_if_constant(PhaseGVN *phase) const { 101 // check that length is constant 102 Node* length = in(ArrayCopyNode::Length); 103 const Type* length_type = phase->type(length); 104 105 if (length_type == Type::TOP) { 106 return -1; 107 } 108 109 assert(is_clonebasic() || is_arraycopy() || is_copyof() || is_copyofrange(), "unexpected array copy type"); 110 111 return is_clonebasic() ? length->find_intptr_t_con(-1) : length->find_int_con(-1); 112 } 113 114 int ArrayCopyNode::get_count(PhaseGVN *phase) const { 115 Node* src = in(ArrayCopyNode::Src); 116 const Type* src_type = phase->type(src); 117 118 if (is_clonebasic()) { 119 if (src_type->isa_instptr()) { 120 const TypeInstPtr* inst_src = src_type->is_instptr(); 121 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass(); 122 // ciInstanceKlass::nof_nonstatic_fields() doesn't take injected 123 // fields into account. They are rare anyway so easier to simply 124 // skip instances with injected fields. 125 if ((!inst_src->klass_is_exact() && (ik->is_interface() || ik->has_subklass())) || ik->has_injected_fields()) { 126 return -1; 127 } 128 int nb_fields = ik->nof_nonstatic_fields(); 129 return nb_fields; 130 } else { 131 const TypeAryPtr* ary_src = src_type->isa_aryptr(); 132 assert (ary_src != NULL, "not an array or instance?"); 133 // clone passes a length as a rounded number of longs. If we're 134 // cloning an array we'll do it element by element. If the 135 // length input to ArrayCopyNode is constant, length of input 136 // array must be too. 137 138 assert((get_length_if_constant(phase) == -1) == !ary_src->size()->is_con() || 139 phase->is_IterGVN(), "inconsistent"); 140 141 if (ary_src->size()->is_con()) { 142 return ary_src->size()->get_con(); 143 } 144 return -1; 145 } 146 } 147 148 return get_length_if_constant(phase); 149 } 150 151 Node* ArrayCopyNode::load(BarrierSetC2* bs, PhaseGVN *phase, Node*& ctl, MergeMemNode* mem, Node* adr, const TypePtr* adr_type, const Type *type, BasicType bt) { 152 DecoratorSet decorators = C2_READ_ACCESS | C2_CONTROL_DEPENDENT_LOAD | IN_HEAP | C2_ARRAY_COPY; 153 C2AccessValuePtr addr(adr, adr_type); 154 C2OptAccess access(*phase, ctl, mem, decorators, bt, adr->in(AddPNode::Base), addr); 155 Node* res = bs->load_at(access, type); 156 ctl = access.ctl(); 157 return res; 158 } 159 160 void ArrayCopyNode::store(BarrierSetC2* bs, PhaseGVN *phase, Node*& ctl, MergeMemNode* mem, Node* adr, const TypePtr* adr_type, Node* val, const Type *type, BasicType bt) { 161 DecoratorSet decorators = C2_WRITE_ACCESS | IN_HEAP | C2_ARRAY_COPY; 162 if (is_alloc_tightly_coupled()) { 163 decorators |= C2_TIGHLY_COUPLED_ALLOC; 164 } 165 C2AccessValuePtr addr(adr, adr_type); 166 C2AccessValue value(val, type); 167 C2OptAccess access(*phase, ctl, mem, decorators, bt, adr->in(AddPNode::Base), addr); 168 bs->store_at(access, value); 169 ctl = access.ctl(); 170 } 171 172 173 Node* ArrayCopyNode::try_clone_instance(PhaseGVN *phase, bool can_reshape, int count) { 174 if (!is_clonebasic()) { 175 return NULL; 176 } 177 178 Node* src = in(ArrayCopyNode::Src); 179 Node* dest = in(ArrayCopyNode::Dest); 180 Node* ctl = in(TypeFunc::Control); 181 Node* in_mem = in(TypeFunc::Memory); 182 183 const Type* src_type = phase->type(src); 184 185 assert(src->is_AddP(), "should be base + off"); 186 assert(dest->is_AddP(), "should be base + off"); 187 Node* base_src = src->in(AddPNode::Base); 188 Node* base_dest = dest->in(AddPNode::Base); 189 190 MergeMemNode* mem = MergeMemNode::make(in_mem); 191 192 const TypeInstPtr* inst_src = src_type->isa_instptr(); 193 194 if (inst_src == NULL) { 195 return NULL; 196 } 197 198 if (!inst_src->klass_is_exact()) { 199 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass(); 200 assert(!ik->is_interface() && !ik->has_subklass(), "inconsistent klass hierarchy"); 201 phase->C->dependencies()->assert_leaf_type(ik); 202 } 203 204 ciInstanceKlass* ik = inst_src->klass()->as_instance_klass(); 205 assert(ik->nof_nonstatic_fields() <= ArrayCopyLoadStoreMaxElem, "too many fields"); 206 207 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 208 for (int i = 0; i < count; i++) { 209 ciField* field = ik->nonstatic_field_at(i); 210 int fieldidx = phase->C->alias_type(field)->index(); 211 const TypePtr* adr_type = phase->C->alias_type(field)->adr_type(); 212 Node* off = phase->MakeConX(field->offset()); 213 Node* next_src = phase->transform(new AddPNode(base_src,base_src,off)); 214 Node* next_dest = phase->transform(new AddPNode(base_dest,base_dest,off)); 215 BasicType bt = field->layout_type(); 216 217 const Type *type; 218 if (bt == T_OBJECT) { 219 if (!field->type()->is_loaded()) { 220 type = TypeInstPtr::BOTTOM; 221 } else { 222 ciType* field_klass = field->type(); 223 type = TypeOopPtr::make_from_klass(field_klass->as_klass()); 224 } 225 } else { 226 type = Type::get_const_basic_type(bt); 227 } 228 229 Node* v = load(bs, phase, ctl, mem, next_src, adr_type, type, bt); 230 store(bs, phase, ctl, mem, next_dest, adr_type, v, type, bt); 231 } 232 233 if (!finish_transform(phase, can_reshape, ctl, mem)) { 234 // Return NodeSentinel to indicate that the transform failed 235 return NodeSentinel; 236 } 237 238 return mem; 239 } 240 241 bool ArrayCopyNode::prepare_array_copy(PhaseGVN *phase, bool can_reshape, 242 Node*& adr_src, 243 Node*& base_src, 244 Node*& adr_dest, 245 Node*& base_dest, 246 BasicType& copy_type, 247 const Type*& value_type, 248 bool& disjoint_bases) { 249 Node* src = in(ArrayCopyNode::Src); 250 Node* dest = in(ArrayCopyNode::Dest); 251 const Type* src_type = phase->type(src); 252 const TypeAryPtr* ary_src = src_type->isa_aryptr(); 253 254 if (is_arraycopy() || is_copyofrange() || is_copyof()) { 255 const Type* dest_type = phase->type(dest); 256 const TypeAryPtr* ary_dest = dest_type->isa_aryptr(); 257 Node* src_offset = in(ArrayCopyNode::SrcPos); 258 Node* dest_offset = in(ArrayCopyNode::DestPos); 259 260 // newly allocated object is guaranteed to not overlap with source object 261 disjoint_bases = is_alloc_tightly_coupled(); 262 263 if (ary_src == NULL || ary_src->klass() == NULL || 264 ary_dest == NULL || ary_dest->klass() == NULL) { 265 // We don't know if arguments are arrays 266 return false; 267 } 268 269 BasicType src_elem = ary_src->klass()->as_array_klass()->element_type()->basic_type(); 270 BasicType dest_elem = ary_dest->klass()->as_array_klass()->element_type()->basic_type(); 271 if (src_elem == T_ARRAY) src_elem = T_OBJECT; 272 if (dest_elem == T_ARRAY) dest_elem = T_OBJECT; 273 274 if (src_elem != dest_elem || dest_elem == T_VOID) { 275 // We don't know if arguments are arrays of the same type 276 return false; 277 } 278 279 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 280 if (bs->array_copy_requires_gc_barriers(is_alloc_tightly_coupled(), dest_elem, false, BarrierSetC2::Optimization)) { 281 // It's an object array copy but we can't emit the card marking 282 // that is needed 283 return false; 284 } 285 286 value_type = ary_src->elem(); 287 288 base_src = src; 289 base_dest = dest; 290 291 uint shift = exact_log2(type2aelembytes(dest_elem)); 292 uint header = arrayOopDesc::base_offset_in_bytes(dest_elem); 293 294 adr_src = src; 295 adr_dest = dest; 296 297 src_offset = Compile::conv_I2X_index(phase, src_offset, ary_src->size()); 298 dest_offset = Compile::conv_I2X_index(phase, dest_offset, ary_dest->size()); 299 300 Node* src_scale = phase->transform(new LShiftXNode(src_offset, phase->intcon(shift))); 301 Node* dest_scale = phase->transform(new LShiftXNode(dest_offset, phase->intcon(shift))); 302 303 adr_src = phase->transform(new AddPNode(base_src, adr_src, src_scale)); 304 adr_dest = phase->transform(new AddPNode(base_dest, adr_dest, dest_scale)); 305 306 adr_src = new AddPNode(base_src, adr_src, phase->MakeConX(header)); 307 adr_dest = new AddPNode(base_dest, adr_dest, phase->MakeConX(header)); 308 309 adr_src = phase->transform(adr_src); 310 adr_dest = phase->transform(adr_dest); 311 312 copy_type = dest_elem; 313 } else { 314 assert(ary_src != NULL, "should be a clone"); 315 assert(is_clonebasic(), "should be"); 316 317 disjoint_bases = true; 318 assert(src->is_AddP(), "should be base + off"); 319 assert(dest->is_AddP(), "should be base + off"); 320 adr_src = src; 321 base_src = src->in(AddPNode::Base); 322 adr_dest = dest; 323 base_dest = dest->in(AddPNode::Base); 324 325 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?"); 326 BasicType elem = ary_src->klass()->as_array_klass()->element_type()->basic_type(); 327 if (elem == T_ARRAY) elem = T_OBJECT; 328 329 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 330 if (bs->array_copy_requires_gc_barriers(true, elem, true, BarrierSetC2::Optimization)) { 331 return false; 332 } 333 334 int diff = arrayOopDesc::base_offset_in_bytes(elem) - phase->type(src->in(AddPNode::Offset))->is_intptr_t()->get_con(); 335 assert(diff >= 0, "clone should not start after 1st array element"); 336 if (diff > 0) { 337 adr_src = phase->transform(new AddPNode(base_src, adr_src, phase->MakeConX(diff))); 338 adr_dest = phase->transform(new AddPNode(base_dest, adr_dest, phase->MakeConX(diff))); 339 } 340 341 copy_type = elem; 342 value_type = ary_src->elem(); 343 } 344 return true; 345 } 346 347 const TypePtr* ArrayCopyNode::get_address_type(PhaseGVN *phase, Node* n) { 348 const Type* at = phase->type(n); 349 assert(at != Type::TOP, "unexpected type"); 350 const TypePtr* atp = at->isa_ptr(); 351 // adjust atp to be the correct array element address type 352 atp = atp->add_offset(Type::OffsetBot); 353 return atp; 354 } 355 356 void ArrayCopyNode::array_copy_test_overlap(PhaseGVN *phase, bool can_reshape, bool disjoint_bases, int count, Node*& forward_ctl, Node*& backward_ctl) { 357 Node* ctl = in(TypeFunc::Control); 358 if (!disjoint_bases && count > 1) { 359 Node* src_offset = in(ArrayCopyNode::SrcPos); 360 Node* dest_offset = in(ArrayCopyNode::DestPos); 361 assert(src_offset != NULL && dest_offset != NULL, "should be"); 362 Node* cmp = phase->transform(new CmpINode(src_offset, dest_offset)); 363 Node *bol = phase->transform(new BoolNode(cmp, BoolTest::lt)); 364 IfNode *iff = new IfNode(ctl, bol, PROB_FAIR, COUNT_UNKNOWN); 365 366 phase->transform(iff); 367 368 forward_ctl = phase->transform(new IfFalseNode(iff)); 369 backward_ctl = phase->transform(new IfTrueNode(iff)); 370 } else { 371 forward_ctl = ctl; 372 } 373 } 374 375 Node* ArrayCopyNode::array_copy_forward(PhaseGVN *phase, 376 bool can_reshape, 377 Node*& forward_ctl, 378 MergeMemNode* mm, 379 const TypePtr* atp_src, 380 const TypePtr* atp_dest, 381 Node* adr_src, 382 Node* base_src, 383 Node* adr_dest, 384 Node* base_dest, 385 BasicType copy_type, 386 const Type* value_type, 387 int count) { 388 if (!forward_ctl->is_top()) { 389 // copy forward 390 mm = mm->clone()->as_MergeMem(); 391 392 if (count > 0) { 393 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 394 Node* v = load(bs, phase, forward_ctl, mm, adr_src, atp_src, value_type, copy_type); 395 store(bs, phase, forward_ctl, mm, adr_dest, atp_dest, v, value_type, copy_type); 396 for (int i = 1; i < count; i++) { 397 Node* off = phase->MakeConX(type2aelembytes(copy_type) * i); 398 Node* next_src = phase->transform(new AddPNode(base_src,adr_src,off)); 399 Node* next_dest = phase->transform(new AddPNode(base_dest,adr_dest,off)); 400 v = load(bs, phase, forward_ctl, mm, next_src, atp_src, value_type, copy_type); 401 store(bs, phase, forward_ctl, mm, next_dest, atp_dest, v, value_type, copy_type); 402 } 403 } else if(can_reshape) { 404 PhaseIterGVN* igvn = phase->is_IterGVN(); 405 igvn->_worklist.push(adr_src); 406 igvn->_worklist.push(adr_dest); 407 } 408 return mm; 409 } 410 return phase->C->top(); 411 } 412 413 Node* ArrayCopyNode::array_copy_backward(PhaseGVN *phase, 414 bool can_reshape, 415 Node*& backward_ctl, 416 MergeMemNode* mm, 417 const TypePtr* atp_src, 418 const TypePtr* atp_dest, 419 Node* adr_src, 420 Node* base_src, 421 Node* adr_dest, 422 Node* base_dest, 423 BasicType copy_type, 424 const Type* value_type, 425 int count) { 426 if (!backward_ctl->is_top()) { 427 // copy backward 428 mm = mm->clone()->as_MergeMem(); 429 430 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 431 assert(copy_type != T_OBJECT || !bs->array_copy_requires_gc_barriers(false, T_OBJECT, false, BarrierSetC2::Optimization), "only tightly coupled allocations for object arrays"); 432 433 if (count > 0) { 434 for (int i = count-1; i >= 1; i--) { 435 Node* off = phase->MakeConX(type2aelembytes(copy_type) * i); 436 Node* next_src = phase->transform(new AddPNode(base_src,adr_src,off)); 437 Node* next_dest = phase->transform(new AddPNode(base_dest,adr_dest,off)); 438 Node* v = load(bs, phase, backward_ctl, mm, next_src, atp_src, value_type, copy_type); 439 store(bs, phase, backward_ctl, mm, next_dest, atp_dest, v, value_type, copy_type); 440 } 441 Node* v = load(bs, phase, backward_ctl, mm, adr_src, atp_src, value_type, copy_type); 442 store(bs, phase, backward_ctl, mm, adr_dest, atp_dest, v, value_type, copy_type); 443 } else if(can_reshape) { 444 PhaseIterGVN* igvn = phase->is_IterGVN(); 445 igvn->_worklist.push(adr_src); 446 igvn->_worklist.push(adr_dest); 447 } 448 return phase->transform(mm); 449 } 450 return phase->C->top(); 451 } 452 453 bool ArrayCopyNode::finish_transform(PhaseGVN *phase, bool can_reshape, 454 Node* ctl, Node *mem) { 455 if (can_reshape) { 456 PhaseIterGVN* igvn = phase->is_IterGVN(); 457 igvn->set_delay_transform(false); 458 if (is_clonebasic()) { 459 Node* out_mem = proj_out(TypeFunc::Memory); 460 461 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 462 if (out_mem->outcnt() != 1 || !out_mem->raw_out(0)->is_MergeMem() || 463 out_mem->raw_out(0)->outcnt() != 1 || !out_mem->raw_out(0)->raw_out(0)->is_MemBar()) { 464 assert(bs->array_copy_requires_gc_barriers(true, T_OBJECT, true, BarrierSetC2::Optimization), "can only happen with card marking"); 465 return false; 466 } 467 468 igvn->replace_node(out_mem->raw_out(0), mem); 469 470 Node* out_ctl = proj_out(TypeFunc::Control); 471 igvn->replace_node(out_ctl, ctl); 472 } else { 473 // replace fallthrough projections of the ArrayCopyNode by the 474 // new memory, control and the input IO. 475 CallProjections callprojs; 476 extract_projections(&callprojs, true, false); 477 478 if (callprojs.fallthrough_ioproj != NULL) { 479 igvn->replace_node(callprojs.fallthrough_ioproj, in(TypeFunc::I_O)); 480 } 481 if (callprojs.fallthrough_memproj != NULL) { 482 igvn->replace_node(callprojs.fallthrough_memproj, mem); 483 } 484 if (callprojs.fallthrough_catchproj != NULL) { 485 igvn->replace_node(callprojs.fallthrough_catchproj, ctl); 486 } 487 488 // The ArrayCopyNode is not disconnected. It still has the 489 // projections for the exception case. Replace current 490 // ArrayCopyNode with a dummy new one with a top() control so 491 // that this part of the graph stays consistent but is 492 // eventually removed. 493 494 set_req(0, phase->C->top()); 495 remove_dead_region(phase, can_reshape); 496 } 497 } else { 498 if (in(TypeFunc::Control) != ctl) { 499 // we can't return new memory and control from Ideal at parse time 500 assert(!is_clonebasic() || UseShenandoahGC, "added control for clone?"); 501 phase->record_for_igvn(this); 502 return false; 503 } 504 } 505 return true; 506 } 507 508 509 Node *ArrayCopyNode::Ideal(PhaseGVN *phase, bool can_reshape) { 510 if (remove_dead_region(phase, can_reshape)) return this; 511 512 if (StressArrayCopyMacroNode && !can_reshape) { 513 phase->record_for_igvn(this); 514 return NULL; 515 } 516 517 // See if it's a small array copy and we can inline it as 518 // loads/stores 519 // Here we can only do: 520 // - arraycopy if all arguments were validated before and we don't 521 // need card marking 522 // - clone for which we don't need to do card marking 523 524 if (!is_clonebasic() && !is_arraycopy_validated() && 525 !is_copyofrange_validated() && !is_copyof_validated()) { 526 return NULL; 527 } 528 529 assert(in(TypeFunc::Control) != NULL && 530 in(TypeFunc::Memory) != NULL && 531 in(ArrayCopyNode::Src) != NULL && 532 in(ArrayCopyNode::Dest) != NULL && 533 in(ArrayCopyNode::Length) != NULL && 534 ((in(ArrayCopyNode::SrcPos) != NULL && in(ArrayCopyNode::DestPos) != NULL) || 535 is_clonebasic()), "broken inputs"); 536 537 if (in(TypeFunc::Control)->is_top() || 538 in(TypeFunc::Memory)->is_top() || 539 phase->type(in(ArrayCopyNode::Src)) == Type::TOP || 540 phase->type(in(ArrayCopyNode::Dest)) == Type::TOP || 541 (in(ArrayCopyNode::SrcPos) != NULL && in(ArrayCopyNode::SrcPos)->is_top()) || 542 (in(ArrayCopyNode::DestPos) != NULL && in(ArrayCopyNode::DestPos)->is_top())) { 543 return NULL; 544 } 545 546 int count = get_count(phase); 547 548 if (count < 0 || count > ArrayCopyLoadStoreMaxElem) { 549 return NULL; 550 } 551 552 Node* mem = try_clone_instance(phase, can_reshape, count); 553 if (mem != NULL) { 554 return (mem == NodeSentinel) ? NULL : mem; 555 } 556 557 Node* adr_src = NULL; 558 Node* base_src = NULL; 559 Node* adr_dest = NULL; 560 Node* base_dest = NULL; 561 BasicType copy_type = T_ILLEGAL; 562 const Type* value_type = NULL; 563 bool disjoint_bases = false; 564 565 if (!prepare_array_copy(phase, can_reshape, 566 adr_src, base_src, adr_dest, base_dest, 567 copy_type, value_type, disjoint_bases)) { 568 return NULL; 569 } 570 571 Node* src = in(ArrayCopyNode::Src); 572 Node* dest = in(ArrayCopyNode::Dest); 573 const TypePtr* atp_src = get_address_type(phase, src); 574 const TypePtr* atp_dest = get_address_type(phase, dest); 575 576 Node *in_mem = in(TypeFunc::Memory); 577 if (!in_mem->is_MergeMem()) { 578 in_mem = MergeMemNode::make(in_mem); 579 } 580 581 582 if (can_reshape) { 583 assert(!phase->is_IterGVN()->delay_transform(), "cannot delay transforms"); 584 phase->is_IterGVN()->set_delay_transform(true); 585 } 586 587 Node* backward_ctl = phase->C->top(); 588 Node* forward_ctl = phase->C->top(); 589 array_copy_test_overlap(phase, can_reshape, disjoint_bases, count, forward_ctl, backward_ctl); 590 591 Node* forward_mem = array_copy_forward(phase, can_reshape, forward_ctl, 592 in_mem->as_MergeMem(), 593 atp_src, atp_dest, 594 adr_src, base_src, adr_dest, base_dest, 595 copy_type, value_type, count); 596 597 Node* backward_mem = array_copy_backward(phase, can_reshape, backward_ctl, 598 in_mem->as_MergeMem(), 599 atp_src, atp_dest, 600 adr_src, base_src, adr_dest, base_dest, 601 copy_type, value_type, count); 602 603 Node* ctl = NULL; 604 if (!forward_ctl->is_top() && !backward_ctl->is_top()) { 605 ctl = new RegionNode(3); 606 ctl->init_req(1, forward_ctl); 607 ctl->init_req(2, backward_ctl); 608 ctl = phase->transform(ctl); 609 MergeMemNode* forward_mm = forward_mem->as_MergeMem(); 610 MergeMemNode* backward_mm = backward_mem->as_MergeMem(); 611 for (MergeMemStream mms(forward_mm, backward_mm); mms.next_non_empty2(); ) { 612 if (mms.memory() != mms.memory2()) { 613 Node* phi = new PhiNode(ctl, Type::MEMORY, phase->C->get_adr_type(mms.alias_idx())); 614 phi->init_req(1, mms.memory()); 615 phi->init_req(2, mms.memory2()); 616 phi = phase->transform(phi); 617 mms.set_memory(phi); 618 } 619 } 620 mem = forward_mem; 621 } else if (!forward_ctl->is_top()) { 622 ctl = forward_ctl; 623 mem = forward_mem; 624 } else { 625 assert(!backward_ctl->is_top(), "no copy?"); 626 ctl = backward_ctl; 627 mem = backward_mem; 628 } 629 630 if (can_reshape) { 631 assert(phase->is_IterGVN()->delay_transform(), "should be delaying transforms"); 632 phase->is_IterGVN()->set_delay_transform(false); 633 } 634 635 if (!finish_transform(phase, can_reshape, ctl, mem)) { 636 return NULL; 637 } 638 639 return mem; 640 } 641 642 bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) { 643 Node* dest = in(ArrayCopyNode::Dest); 644 if (dest->is_top()) { 645 return false; 646 } 647 const TypeOopPtr* dest_t = phase->type(dest)->is_oopptr(); 648 assert(!dest_t->is_known_instance() || _dest_type->is_known_instance(), "result of EA not recorded"); 649 assert(in(ArrayCopyNode::Src)->is_top() || !phase->type(in(ArrayCopyNode::Src))->is_oopptr()->is_known_instance() || 650 _src_type->is_known_instance(), "result of EA not recorded"); 651 652 if (_dest_type != TypeOopPtr::BOTTOM || t_oop->is_known_instance()) { 653 assert(_dest_type == TypeOopPtr::BOTTOM || _dest_type->is_known_instance(), "result of EA is known instance"); 654 return t_oop->instance_id() == _dest_type->instance_id(); 655 } 656 657 return CallNode::may_modify_arraycopy_helper(dest_t, t_oop, phase); 658 } 659 660 bool ArrayCopyNode::may_modify_helper(const TypeOopPtr *t_oop, Node* n, PhaseTransform *phase, CallNode*& call) { 661 if (n != NULL && 662 n->is_Call() && 663 n->as_Call()->may_modify(t_oop, phase) && 664 (n->as_Call()->is_ArrayCopy() || n->as_Call()->is_call_to_arraycopystub())) { 665 call = n->as_Call(); 666 return true; 667 } 668 return false; 669 } 670 671 bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, MemBarNode* mb, PhaseTransform *phase, ArrayCopyNode*& ac) { 672 673 Node* c = mb->in(0); 674 675 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 676 // step over g1 gc barrier if we're at e.g. a clone with ReduceInitialCardMarks off 677 c = bs->step_over_gc_barrier(c); 678 679 CallNode* call = NULL; 680 guarantee(c != NULL, "step_over_gc_barrier failed, there must be something to step to."); 681 if (c->is_Region()) { 682 for (uint i = 1; i < c->req(); i++) { 683 if (c->in(i) != NULL) { 684 Node* n = c->in(i)->in(0); 685 if (may_modify_helper(t_oop, n, phase, call)) { 686 ac = call->isa_ArrayCopy(); 687 assert(c == mb->in(0), "only for clone"); 688 return true; 689 } 690 } 691 } 692 } else if (may_modify_helper(t_oop, c->in(0), phase, call)) { 693 ac = call->isa_ArrayCopy(); 694 #ifdef ASSERT 695 bool use_ReduceInitialCardMarks = BarrierSet::barrier_set()->is_a(BarrierSet::CardTableBarrierSet) && 696 static_cast<CardTableBarrierSetC2*>(bs)->use_ReduceInitialCardMarks(); 697 assert(c == mb->in(0) || (ac != NULL && ac->is_clonebasic() && !use_ReduceInitialCardMarks), "only for clone"); 698 #endif 699 return true; 700 } 701 702 return false; 703 } 704 705 // Does this array copy modify offsets between offset_lo and offset_hi 706 // in the destination array 707 // if must_modify is false, return true if the copy could write 708 // between offset_lo and offset_hi 709 // if must_modify is true, return true if the copy is guaranteed to 710 // write between offset_lo and offset_hi 711 bool ArrayCopyNode::modifies(intptr_t offset_lo, intptr_t offset_hi, PhaseTransform* phase, bool must_modify) const { 712 assert(_kind == ArrayCopy || _kind == CopyOf || _kind == CopyOfRange, "only for real array copies"); 713 714 Node* dest = in(Dest); 715 Node* dest_pos = in(DestPos); 716 Node* len = in(Length); 717 718 const TypeInt *dest_pos_t = phase->type(dest_pos)->isa_int(); 719 const TypeInt *len_t = phase->type(len)->isa_int(); 720 const TypeAryPtr* ary_t = phase->type(dest)->isa_aryptr(); 721 722 if (dest_pos_t == NULL || len_t == NULL || ary_t == NULL) { 723 return !must_modify; 724 } 725 726 BasicType ary_elem = ary_t->klass()->as_array_klass()->element_type()->basic_type(); 727 uint header = arrayOopDesc::base_offset_in_bytes(ary_elem); 728 uint elemsize = type2aelembytes(ary_elem); 729 730 jlong dest_pos_plus_len_lo = (((jlong)dest_pos_t->_lo) + len_t->_lo) * elemsize + header; 731 jlong dest_pos_plus_len_hi = (((jlong)dest_pos_t->_hi) + len_t->_hi) * elemsize + header; 732 jlong dest_pos_lo = ((jlong)dest_pos_t->_lo) * elemsize + header; 733 jlong dest_pos_hi = ((jlong)dest_pos_t->_hi) * elemsize + header; 734 735 if (must_modify) { 736 if (offset_lo >= dest_pos_hi && offset_hi < dest_pos_plus_len_lo) { 737 return true; 738 } 739 } else { 740 if (offset_hi >= dest_pos_lo && offset_lo < dest_pos_plus_len_hi) { 741 return true; 742 } 743 } 744 return false; 745 }