1 /* 2 * Copyright (c) 2005, 2019, 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 "c1/c1_Compilation.hpp" 27 #include "c1/c1_Defs.hpp" 28 #include "c1/c1_FrameMap.hpp" 29 #include "c1/c1_Instruction.hpp" 30 #include "c1/c1_LIRAssembler.hpp" 31 #include "c1/c1_LIRGenerator.hpp" 32 #include "c1/c1_ValueStack.hpp" 33 #include "ci/ciArrayKlass.hpp" 34 #include "ci/ciInstance.hpp" 35 #include "ci/ciObjArray.hpp" 36 #include "ci/ciUtilities.hpp" 37 #include "ci/ciValueArrayKlass.hpp" 38 #include "ci/ciValueKlass.hpp" 39 #include "gc/shared/barrierSet.hpp" 40 #include "gc/shared/c1/barrierSetC1.hpp" 41 #include "runtime/arguments.hpp" 42 #include "runtime/sharedRuntime.hpp" 43 #include "runtime/stubRoutines.hpp" 44 #include "runtime/vm_version.hpp" 45 #include "utilities/bitMap.inline.hpp" 46 #include "utilities/macros.hpp" 47 48 #ifdef ASSERT 49 #define __ gen()->lir(__FILE__, __LINE__)-> 50 #else 51 #define __ gen()->lir()-> 52 #endif 53 54 #ifndef PATCHED_ADDR 55 #define PATCHED_ADDR (max_jint) 56 #endif 57 58 void PhiResolverState::reset(int max_vregs) { 59 // Initialize array sizes 60 _virtual_operands.at_put_grow(max_vregs - 1, NULL, NULL); 61 _virtual_operands.trunc_to(0); 62 _other_operands.at_put_grow(max_vregs - 1, NULL, NULL); 63 _other_operands.trunc_to(0); 64 _vreg_table.at_put_grow(max_vregs - 1, NULL, NULL); 65 _vreg_table.trunc_to(0); 66 } 67 68 69 70 //-------------------------------------------------------------- 71 // PhiResolver 72 73 // Resolves cycles: 74 // 75 // r1 := r2 becomes temp := r1 76 // r2 := r1 r1 := r2 77 // r2 := temp 78 // and orders moves: 79 // 80 // r2 := r3 becomes r1 := r2 81 // r1 := r2 r2 := r3 82 83 PhiResolver::PhiResolver(LIRGenerator* gen, int max_vregs) 84 : _gen(gen) 85 , _state(gen->resolver_state()) 86 , _temp(LIR_OprFact::illegalOpr) 87 { 88 // reinitialize the shared state arrays 89 _state.reset(max_vregs); 90 } 91 92 93 void PhiResolver::emit_move(LIR_Opr src, LIR_Opr dest) { 94 assert(src->is_valid(), ""); 95 assert(dest->is_valid(), ""); 96 __ move(src, dest); 97 } 98 99 100 void PhiResolver::move_temp_to(LIR_Opr dest) { 101 assert(_temp->is_valid(), ""); 102 emit_move(_temp, dest); 103 NOT_PRODUCT(_temp = LIR_OprFact::illegalOpr); 104 } 105 106 107 void PhiResolver::move_to_temp(LIR_Opr src) { 108 assert(_temp->is_illegal(), ""); 109 _temp = _gen->new_register(src->type()); 110 emit_move(src, _temp); 111 } 112 113 114 // Traverse assignment graph in depth first order and generate moves in post order 115 // ie. two assignments: b := c, a := b start with node c: 116 // Call graph: move(NULL, c) -> move(c, b) -> move(b, a) 117 // Generates moves in this order: move b to a and move c to b 118 // ie. cycle a := b, b := a start with node a 119 // Call graph: move(NULL, a) -> move(a, b) -> move(b, a) 120 // Generates moves in this order: move b to temp, move a to b, move temp to a 121 void PhiResolver::move(ResolveNode* src, ResolveNode* dest) { 122 if (!dest->visited()) { 123 dest->set_visited(); 124 for (int i = dest->no_of_destinations()-1; i >= 0; i --) { 125 move(dest, dest->destination_at(i)); 126 } 127 } else if (!dest->start_node()) { 128 // cylce in graph detected 129 assert(_loop == NULL, "only one loop valid!"); 130 _loop = dest; 131 move_to_temp(src->operand()); 132 return; 133 } // else dest is a start node 134 135 if (!dest->assigned()) { 136 if (_loop == dest) { 137 move_temp_to(dest->operand()); 138 dest->set_assigned(); 139 } else if (src != NULL) { 140 emit_move(src->operand(), dest->operand()); 141 dest->set_assigned(); 142 } 143 } 144 } 145 146 147 PhiResolver::~PhiResolver() { 148 int i; 149 // resolve any cycles in moves from and to virtual registers 150 for (i = virtual_operands().length() - 1; i >= 0; i --) { 151 ResolveNode* node = virtual_operands().at(i); 152 if (!node->visited()) { 153 _loop = NULL; 154 move(NULL, node); 155 node->set_start_node(); 156 assert(_temp->is_illegal(), "move_temp_to() call missing"); 157 } 158 } 159 160 // generate move for move from non virtual register to abitrary destination 161 for (i = other_operands().length() - 1; i >= 0; i --) { 162 ResolveNode* node = other_operands().at(i); 163 for (int j = node->no_of_destinations() - 1; j >= 0; j --) { 164 emit_move(node->operand(), node->destination_at(j)->operand()); 165 } 166 } 167 } 168 169 170 ResolveNode* PhiResolver::create_node(LIR_Opr opr, bool source) { 171 ResolveNode* node; 172 if (opr->is_virtual()) { 173 int vreg_num = opr->vreg_number(); 174 node = vreg_table().at_grow(vreg_num, NULL); 175 assert(node == NULL || node->operand() == opr, ""); 176 if (node == NULL) { 177 node = new ResolveNode(opr); 178 vreg_table().at_put(vreg_num, node); 179 } 180 // Make sure that all virtual operands show up in the list when 181 // they are used as the source of a move. 182 if (source && !virtual_operands().contains(node)) { 183 virtual_operands().append(node); 184 } 185 } else { 186 assert(source, ""); 187 node = new ResolveNode(opr); 188 other_operands().append(node); 189 } 190 return node; 191 } 192 193 194 void PhiResolver::move(LIR_Opr src, LIR_Opr dest) { 195 assert(dest->is_virtual(), ""); 196 // tty->print("move "); src->print(); tty->print(" to "); dest->print(); tty->cr(); 197 assert(src->is_valid(), ""); 198 assert(dest->is_valid(), ""); 199 ResolveNode* source = source_node(src); 200 source->append(destination_node(dest)); 201 } 202 203 204 //-------------------------------------------------------------- 205 // LIRItem 206 207 void LIRItem::set_result(LIR_Opr opr) { 208 assert(value()->operand()->is_illegal() || value()->operand()->is_constant(), "operand should never change"); 209 value()->set_operand(opr); 210 211 if (opr->is_virtual()) { 212 _gen->_instruction_for_operand.at_put_grow(opr->vreg_number(), value(), NULL); 213 } 214 215 _result = opr; 216 } 217 218 void LIRItem::load_item() { 219 if (result()->is_illegal()) { 220 // update the items result 221 _result = value()->operand(); 222 } 223 if (!result()->is_register()) { 224 LIR_Opr reg = _gen->new_register(value()->type()); 225 __ move(result(), reg); 226 if (result()->is_constant()) { 227 _result = reg; 228 } else { 229 set_result(reg); 230 } 231 } 232 } 233 234 235 void LIRItem::load_for_store(BasicType type) { 236 if (_gen->can_store_as_constant(value(), type)) { 237 _result = value()->operand(); 238 if (!_result->is_constant()) { 239 _result = LIR_OprFact::value_type(value()->type()); 240 } 241 } else if (type == T_BYTE || type == T_BOOLEAN) { 242 load_byte_item(); 243 } else { 244 load_item(); 245 } 246 } 247 248 void LIRItem::load_item_force(LIR_Opr reg) { 249 LIR_Opr r = result(); 250 if (r != reg) { 251 #if !defined(ARM) && !defined(E500V2) 252 if (r->type() != reg->type()) { 253 // moves between different types need an intervening spill slot 254 r = _gen->force_to_spill(r, reg->type()); 255 } 256 #endif 257 __ move(r, reg); 258 _result = reg; 259 } 260 } 261 262 ciObject* LIRItem::get_jobject_constant() const { 263 ObjectType* oc = type()->as_ObjectType(); 264 if (oc) { 265 return oc->constant_value(); 266 } 267 return NULL; 268 } 269 270 271 jint LIRItem::get_jint_constant() const { 272 assert(is_constant() && value() != NULL, ""); 273 assert(type()->as_IntConstant() != NULL, "type check"); 274 return type()->as_IntConstant()->value(); 275 } 276 277 278 jint LIRItem::get_address_constant() const { 279 assert(is_constant() && value() != NULL, ""); 280 assert(type()->as_AddressConstant() != NULL, "type check"); 281 return type()->as_AddressConstant()->value(); 282 } 283 284 285 jfloat LIRItem::get_jfloat_constant() const { 286 assert(is_constant() && value() != NULL, ""); 287 assert(type()->as_FloatConstant() != NULL, "type check"); 288 return type()->as_FloatConstant()->value(); 289 } 290 291 292 jdouble LIRItem::get_jdouble_constant() const { 293 assert(is_constant() && value() != NULL, ""); 294 assert(type()->as_DoubleConstant() != NULL, "type check"); 295 return type()->as_DoubleConstant()->value(); 296 } 297 298 299 jlong LIRItem::get_jlong_constant() const { 300 assert(is_constant() && value() != NULL, ""); 301 assert(type()->as_LongConstant() != NULL, "type check"); 302 return type()->as_LongConstant()->value(); 303 } 304 305 306 307 //-------------------------------------------------------------- 308 309 310 void LIRGenerator::block_do_prolog(BlockBegin* block) { 311 #ifndef PRODUCT 312 if (PrintIRWithLIR) { 313 block->print(); 314 } 315 #endif 316 317 // set up the list of LIR instructions 318 assert(block->lir() == NULL, "LIR list already computed for this block"); 319 _lir = new LIR_List(compilation(), block); 320 block->set_lir(_lir); 321 322 __ branch_destination(block->label()); 323 324 if (LIRTraceExecution && 325 Compilation::current()->hir()->start()->block_id() != block->block_id() && 326 !block->is_set(BlockBegin::exception_entry_flag)) { 327 assert(block->lir()->instructions_list()->length() == 1, "should come right after br_dst"); 328 trace_block_entry(block); 329 } 330 } 331 332 333 void LIRGenerator::block_do_epilog(BlockBegin* block) { 334 #ifndef PRODUCT 335 if (PrintIRWithLIR) { 336 tty->cr(); 337 } 338 #endif 339 340 // LIR_Opr for unpinned constants shouldn't be referenced by other 341 // blocks so clear them out after processing the block. 342 for (int i = 0; i < _unpinned_constants.length(); i++) { 343 _unpinned_constants.at(i)->clear_operand(); 344 } 345 _unpinned_constants.trunc_to(0); 346 347 // clear our any registers for other local constants 348 _constants.trunc_to(0); 349 _reg_for_constants.trunc_to(0); 350 } 351 352 353 void LIRGenerator::block_do(BlockBegin* block) { 354 CHECK_BAILOUT(); 355 356 block_do_prolog(block); 357 set_block(block); 358 359 for (Instruction* instr = block; instr != NULL; instr = instr->next()) { 360 if (instr->is_pinned()) do_root(instr); 361 } 362 363 set_block(NULL); 364 block_do_epilog(block); 365 } 366 367 368 //-------------------------LIRGenerator----------------------------- 369 370 // This is where the tree-walk starts; instr must be root; 371 void LIRGenerator::do_root(Value instr) { 372 CHECK_BAILOUT(); 373 374 InstructionMark im(compilation(), instr); 375 376 assert(instr->is_pinned(), "use only with roots"); 377 assert(instr->subst() == instr, "shouldn't have missed substitution"); 378 379 instr->visit(this); 380 381 assert(!instr->has_uses() || instr->operand()->is_valid() || 382 instr->as_Constant() != NULL || bailed_out(), "invalid item set"); 383 } 384 385 386 // This is called for each node in tree; the walk stops if a root is reached 387 void LIRGenerator::walk(Value instr) { 388 InstructionMark im(compilation(), instr); 389 //stop walk when encounter a root 390 if ((instr->is_pinned() && instr->as_Phi() == NULL) || instr->operand()->is_valid()) { 391 assert(instr->operand() != LIR_OprFact::illegalOpr || instr->as_Constant() != NULL, "this root has not yet been visited"); 392 } else { 393 assert(instr->subst() == instr, "shouldn't have missed substitution"); 394 instr->visit(this); 395 // assert(instr->use_count() > 0 || instr->as_Phi() != NULL, "leaf instruction must have a use"); 396 } 397 } 398 399 400 CodeEmitInfo* LIRGenerator::state_for(Instruction* x, ValueStack* state, bool ignore_xhandler) { 401 assert(state != NULL, "state must be defined"); 402 403 #ifndef PRODUCT 404 state->verify(); 405 #endif 406 407 ValueStack* s = state; 408 for_each_state(s) { 409 if (s->kind() == ValueStack::EmptyExceptionState) { 410 assert(s->stack_size() == 0 && s->locals_size() == 0 && (s->locks_size() == 0 || s->locks_size() == 1), "state must be empty"); 411 continue; 412 } 413 414 int index; 415 Value value; 416 for_each_stack_value(s, index, value) { 417 assert(value->subst() == value, "missed substitution"); 418 if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { 419 walk(value); 420 assert(value->operand()->is_valid(), "must be evaluated now"); 421 } 422 } 423 424 int bci = s->bci(); 425 IRScope* scope = s->scope(); 426 ciMethod* method = scope->method(); 427 428 MethodLivenessResult liveness = method->liveness_at_bci(bci); 429 if (bci == SynchronizationEntryBCI) { 430 if (x->as_ExceptionObject() || x->as_Throw()) { 431 // all locals are dead on exit from the synthetic unlocker 432 liveness.clear(); 433 } else { 434 assert(x->as_MonitorEnter() || x->as_ProfileInvoke(), "only other cases are MonitorEnter and ProfileInvoke"); 435 } 436 } 437 if (!liveness.is_valid()) { 438 // Degenerate or breakpointed method. 439 bailout("Degenerate or breakpointed method"); 440 } else { 441 assert((int)liveness.size() == s->locals_size(), "error in use of liveness"); 442 for_each_local_value(s, index, value) { 443 assert(value->subst() == value, "missed substition"); 444 if (liveness.at(index) && !value->type()->is_illegal()) { 445 if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { 446 walk(value); 447 assert(value->operand()->is_valid(), "must be evaluated now"); 448 } 449 } else { 450 // NULL out this local so that linear scan can assume that all non-NULL values are live. 451 s->invalidate_local(index); 452 } 453 } 454 } 455 } 456 457 return new CodeEmitInfo(state, ignore_xhandler ? NULL : x->exception_handlers(), x->check_flag(Instruction::DeoptimizeOnException)); 458 } 459 460 461 CodeEmitInfo* LIRGenerator::state_for(Instruction* x) { 462 return state_for(x, x->exception_state()); 463 } 464 465 466 void LIRGenerator::klass2reg_with_patching(LIR_Opr r, ciMetadata* obj, CodeEmitInfo* info, bool need_resolve) { 467 /* C2 relies on constant pool entries being resolved (ciTypeFlow), so if TieredCompilation 468 * is active and the class hasn't yet been resolved we need to emit a patch that resolves 469 * the class. */ 470 if ((TieredCompilation && need_resolve) || !obj->is_loaded() || PatchALot) { 471 assert(info != NULL, "info must be set if class is not loaded"); 472 __ klass2reg_patch(NULL, r, info); 473 } else { 474 // no patching needed 475 __ metadata2reg(obj->constant_encoding(), r); 476 } 477 } 478 479 480 void LIRGenerator::array_range_check(LIR_Opr array, LIR_Opr index, 481 CodeEmitInfo* null_check_info, CodeEmitInfo* range_check_info) { 482 CodeStub* stub = new RangeCheckStub(range_check_info, index, array); 483 if (index->is_constant()) { 484 cmp_mem_int(lir_cond_belowEqual, array, arrayOopDesc::length_offset_in_bytes(), 485 index->as_jint(), null_check_info); 486 __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch 487 } else { 488 cmp_reg_mem(lir_cond_aboveEqual, index, array, 489 arrayOopDesc::length_offset_in_bytes(), T_INT, null_check_info); 490 __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch 491 } 492 } 493 494 495 void LIRGenerator::nio_range_check(LIR_Opr buffer, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) { 496 CodeStub* stub = new RangeCheckStub(info, index); 497 if (index->is_constant()) { 498 cmp_mem_int(lir_cond_belowEqual, buffer, java_nio_Buffer::limit_offset(), index->as_jint(), info); 499 __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch 500 } else { 501 cmp_reg_mem(lir_cond_aboveEqual, index, buffer, 502 java_nio_Buffer::limit_offset(), T_INT, info); 503 __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch 504 } 505 __ move(index, result); 506 } 507 508 509 510 void LIRGenerator::arithmetic_op(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp_op, CodeEmitInfo* info) { 511 LIR_Opr result_op = result; 512 LIR_Opr left_op = left; 513 LIR_Opr right_op = right; 514 515 if (TwoOperandLIRForm && left_op != result_op) { 516 assert(right_op != result_op, "malformed"); 517 __ move(left_op, result_op); 518 left_op = result_op; 519 } 520 521 switch(code) { 522 case Bytecodes::_dadd: 523 case Bytecodes::_fadd: 524 case Bytecodes::_ladd: 525 case Bytecodes::_iadd: __ add(left_op, right_op, result_op); break; 526 case Bytecodes::_fmul: 527 case Bytecodes::_lmul: __ mul(left_op, right_op, result_op); break; 528 529 case Bytecodes::_dmul: 530 { 531 if (is_strictfp) { 532 __ mul_strictfp(left_op, right_op, result_op, tmp_op); break; 533 } else { 534 __ mul(left_op, right_op, result_op); break; 535 } 536 } 537 break; 538 539 case Bytecodes::_imul: 540 { 541 bool did_strength_reduce = false; 542 543 if (right->is_constant()) { 544 jint c = right->as_jint(); 545 if (c > 0 && is_power_of_2(c)) { 546 // do not need tmp here 547 __ shift_left(left_op, exact_log2(c), result_op); 548 did_strength_reduce = true; 549 } else { 550 did_strength_reduce = strength_reduce_multiply(left_op, c, result_op, tmp_op); 551 } 552 } 553 // we couldn't strength reduce so just emit the multiply 554 if (!did_strength_reduce) { 555 __ mul(left_op, right_op, result_op); 556 } 557 } 558 break; 559 560 case Bytecodes::_dsub: 561 case Bytecodes::_fsub: 562 case Bytecodes::_lsub: 563 case Bytecodes::_isub: __ sub(left_op, right_op, result_op); break; 564 565 case Bytecodes::_fdiv: __ div (left_op, right_op, result_op); break; 566 // ldiv and lrem are implemented with a direct runtime call 567 568 case Bytecodes::_ddiv: 569 { 570 if (is_strictfp) { 571 __ div_strictfp (left_op, right_op, result_op, tmp_op); break; 572 } else { 573 __ div (left_op, right_op, result_op); break; 574 } 575 } 576 break; 577 578 case Bytecodes::_drem: 579 case Bytecodes::_frem: __ rem (left_op, right_op, result_op); break; 580 581 default: ShouldNotReachHere(); 582 } 583 } 584 585 586 void LIRGenerator::arithmetic_op_int(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr tmp) { 587 arithmetic_op(code, result, left, right, false, tmp); 588 } 589 590 591 void LIRGenerator::arithmetic_op_long(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info) { 592 arithmetic_op(code, result, left, right, false, LIR_OprFact::illegalOpr, info); 593 } 594 595 596 void LIRGenerator::arithmetic_op_fpu(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp) { 597 arithmetic_op(code, result, left, right, is_strictfp, tmp); 598 } 599 600 601 void LIRGenerator::shift_op(Bytecodes::Code code, LIR_Opr result_op, LIR_Opr value, LIR_Opr count, LIR_Opr tmp) { 602 603 if (TwoOperandLIRForm && value != result_op 604 // Only 32bit right shifts require two operand form on S390. 605 S390_ONLY(&& (code == Bytecodes::_ishr || code == Bytecodes::_iushr))) { 606 assert(count != result_op, "malformed"); 607 __ move(value, result_op); 608 value = result_op; 609 } 610 611 assert(count->is_constant() || count->is_register(), "must be"); 612 switch(code) { 613 case Bytecodes::_ishl: 614 case Bytecodes::_lshl: __ shift_left(value, count, result_op, tmp); break; 615 case Bytecodes::_ishr: 616 case Bytecodes::_lshr: __ shift_right(value, count, result_op, tmp); break; 617 case Bytecodes::_iushr: 618 case Bytecodes::_lushr: __ unsigned_shift_right(value, count, result_op, tmp); break; 619 default: ShouldNotReachHere(); 620 } 621 } 622 623 624 void LIRGenerator::logic_op (Bytecodes::Code code, LIR_Opr result_op, LIR_Opr left_op, LIR_Opr right_op) { 625 if (TwoOperandLIRForm && left_op != result_op) { 626 assert(right_op != result_op, "malformed"); 627 __ move(left_op, result_op); 628 left_op = result_op; 629 } 630 631 switch(code) { 632 case Bytecodes::_iand: 633 case Bytecodes::_land: __ logical_and(left_op, right_op, result_op); break; 634 635 case Bytecodes::_ior: 636 case Bytecodes::_lor: __ logical_or(left_op, right_op, result_op); break; 637 638 case Bytecodes::_ixor: 639 case Bytecodes::_lxor: __ logical_xor(left_op, right_op, result_op); break; 640 641 default: ShouldNotReachHere(); 642 } 643 } 644 645 646 void LIRGenerator::monitor_enter(LIR_Opr object, LIR_Opr lock, LIR_Opr hdr, LIR_Opr scratch, int monitor_no, 647 CodeEmitInfo* info_for_exception, CodeEmitInfo* info, CodeStub* throw_imse_stub) { 648 if (!GenerateSynchronizationCode) return; 649 // for slow path, use debug info for state after successful locking 650 CodeStub* slow_path = new MonitorEnterStub(object, lock, info, throw_imse_stub, scratch); 651 __ load_stack_address_monitor(monitor_no, lock); 652 // for handling NullPointerException, use debug info representing just the lock stack before this monitorenter 653 __ lock_object(hdr, object, lock, scratch, slow_path, info_for_exception, throw_imse_stub); 654 } 655 656 657 void LIRGenerator::monitor_exit(LIR_Opr object, LIR_Opr lock, LIR_Opr new_hdr, LIR_Opr scratch, int monitor_no) { 658 if (!GenerateSynchronizationCode) return; 659 // setup registers 660 LIR_Opr hdr = lock; 661 lock = new_hdr; 662 CodeStub* slow_path = new MonitorExitStub(lock, UseFastLocking, monitor_no); 663 __ load_stack_address_monitor(monitor_no, lock); 664 __ unlock_object(hdr, object, lock, scratch, slow_path); 665 } 666 667 #ifndef PRODUCT 668 void LIRGenerator::print_if_not_loaded(const NewInstance* new_instance) { 669 if (PrintNotLoaded && !new_instance->klass()->is_loaded()) { 670 tty->print_cr(" ###class not loaded at new bci %d", new_instance->printable_bci()); 671 } else if (PrintNotLoaded && (TieredCompilation && new_instance->is_unresolved())) { 672 tty->print_cr(" ###class not resolved at new bci %d", new_instance->printable_bci()); 673 } 674 } 675 #endif 676 677 void LIRGenerator::new_instance(LIR_Opr dst, ciInstanceKlass* klass, bool is_unresolved, LIR_Opr scratch1, LIR_Opr scratch2, LIR_Opr scratch3, LIR_Opr scratch4, LIR_Opr klass_reg, CodeEmitInfo* info) { 678 klass2reg_with_patching(klass_reg, klass, info, is_unresolved); 679 // If klass is not loaded we do not know if the klass has finalizers: 680 if (UseFastNewInstance && klass->is_loaded() 681 && !Klass::layout_helper_needs_slow_path(klass->layout_helper())) { 682 683 Runtime1::StubID stub_id = klass->is_initialized() ? Runtime1::fast_new_instance_id : Runtime1::fast_new_instance_init_check_id; 684 685 CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, stub_id); 686 687 assert(klass->is_loaded(), "must be loaded"); 688 // allocate space for instance 689 assert(klass->size_helper() >= 0, "illegal instance size"); 690 const int instance_size = align_object_size(klass->size_helper()); 691 __ allocate_object(dst, scratch1, scratch2, scratch3, scratch4, 692 oopDesc::header_size(), instance_size, klass_reg, !klass->is_initialized(), slow_path); 693 } else { 694 CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, Runtime1::new_instance_id); 695 __ branch(lir_cond_always, T_ILLEGAL, slow_path); 696 __ branch_destination(slow_path->continuation()); 697 } 698 } 699 700 701 static bool is_constant_zero(Instruction* inst) { 702 IntConstant* c = inst->type()->as_IntConstant(); 703 if (c) { 704 return (c->value() == 0); 705 } 706 return false; 707 } 708 709 710 static bool positive_constant(Instruction* inst) { 711 IntConstant* c = inst->type()->as_IntConstant(); 712 if (c) { 713 return (c->value() >= 0); 714 } 715 return false; 716 } 717 718 719 static ciArrayKlass* as_array_klass(ciType* type) { 720 if (type != NULL && type->is_array_klass() && type->is_loaded()) { 721 return (ciArrayKlass*)type; 722 } else { 723 return NULL; 724 } 725 } 726 727 static ciType* phi_declared_type(Phi* phi) { 728 ciType* t = phi->operand_at(0)->declared_type(); 729 if (t == NULL) { 730 return NULL; 731 } 732 for(int i = 1; i < phi->operand_count(); i++) { 733 if (t != phi->operand_at(i)->declared_type()) { 734 return NULL; 735 } 736 } 737 return t; 738 } 739 740 void LIRGenerator::arraycopy_helper(Intrinsic* x, int* flagsp, ciArrayKlass** expected_typep) { 741 Instruction* src = x->argument_at(0); 742 Instruction* src_pos = x->argument_at(1); 743 Instruction* dst = x->argument_at(2); 744 Instruction* dst_pos = x->argument_at(3); 745 Instruction* length = x->argument_at(4); 746 747 // first try to identify the likely type of the arrays involved 748 ciArrayKlass* expected_type = NULL; 749 bool is_exact = false, src_objarray = false, dst_objarray = false; 750 { 751 ciArrayKlass* src_exact_type = as_array_klass(src->exact_type()); 752 ciArrayKlass* src_declared_type = as_array_klass(src->declared_type()); 753 Phi* phi; 754 if (src_declared_type == NULL && (phi = src->as_Phi()) != NULL) { 755 src_declared_type = as_array_klass(phi_declared_type(phi)); 756 } 757 ciArrayKlass* dst_exact_type = as_array_klass(dst->exact_type()); 758 ciArrayKlass* dst_declared_type = as_array_klass(dst->declared_type()); 759 if (dst_declared_type == NULL && (phi = dst->as_Phi()) != NULL) { 760 dst_declared_type = as_array_klass(phi_declared_type(phi)); 761 } 762 763 if (src_exact_type != NULL && src_exact_type == dst_exact_type) { 764 // the types exactly match so the type is fully known 765 is_exact = true; 766 expected_type = src_exact_type; 767 } else if (dst_exact_type != NULL && dst_exact_type->is_obj_array_klass()) { 768 ciArrayKlass* dst_type = (ciArrayKlass*) dst_exact_type; 769 ciArrayKlass* src_type = NULL; 770 if (src_exact_type != NULL && src_exact_type->is_obj_array_klass()) { 771 src_type = (ciArrayKlass*) src_exact_type; 772 } else if (src_declared_type != NULL && src_declared_type->is_obj_array_klass()) { 773 src_type = (ciArrayKlass*) src_declared_type; 774 } 775 if (src_type != NULL) { 776 if (src_type->element_type()->is_subtype_of(dst_type->element_type())) { 777 is_exact = true; 778 expected_type = dst_type; 779 } 780 } 781 } 782 // at least pass along a good guess 783 if (expected_type == NULL) expected_type = dst_exact_type; 784 if (expected_type == NULL) expected_type = src_declared_type; 785 if (expected_type == NULL) expected_type = dst_declared_type; 786 787 src_objarray = (src_exact_type && src_exact_type->is_obj_array_klass()) || (src_declared_type && src_declared_type->is_obj_array_klass()); 788 dst_objarray = (dst_exact_type && dst_exact_type->is_obj_array_klass()) || (dst_declared_type && dst_declared_type->is_obj_array_klass()); 789 } 790 791 // if a probable array type has been identified, figure out if any 792 // of the required checks for a fast case can be elided. 793 int flags = LIR_OpArrayCopy::all_flags; 794 795 if (!src->is_loaded_flattened_array() && !dst->is_loaded_flattened_array()) { 796 flags &= ~LIR_OpArrayCopy::always_slow_path; 797 } 798 if (!src->maybe_flattened_array()) { 799 flags &= ~LIR_OpArrayCopy::src_flat_check; 800 } 801 if (!dst->maybe_flattened_array()) { 802 flags &= ~LIR_OpArrayCopy::dst_flat_check; 803 } 804 805 if (!src_objarray) 806 flags &= ~LIR_OpArrayCopy::src_objarray; 807 if (!dst_objarray) 808 flags &= ~LIR_OpArrayCopy::dst_objarray; 809 810 if (!x->arg_needs_null_check(0)) 811 flags &= ~LIR_OpArrayCopy::src_null_check; 812 if (!x->arg_needs_null_check(2)) 813 flags &= ~LIR_OpArrayCopy::dst_null_check; 814 815 816 if (expected_type != NULL) { 817 Value length_limit = NULL; 818 819 IfOp* ifop = length->as_IfOp(); 820 if (ifop != NULL) { 821 // look for expressions like min(v, a.length) which ends up as 822 // x > y ? y : x or x >= y ? y : x 823 if ((ifop->cond() == If::gtr || ifop->cond() == If::geq) && 824 ifop->x() == ifop->fval() && 825 ifop->y() == ifop->tval()) { 826 length_limit = ifop->y(); 827 } 828 } 829 830 // try to skip null checks and range checks 831 NewArray* src_array = src->as_NewArray(); 832 if (src_array != NULL) { 833 flags &= ~LIR_OpArrayCopy::src_null_check; 834 if (length_limit != NULL && 835 src_array->length() == length_limit && 836 is_constant_zero(src_pos)) { 837 flags &= ~LIR_OpArrayCopy::src_range_check; 838 } 839 } 840 841 NewArray* dst_array = dst->as_NewArray(); 842 if (dst_array != NULL) { 843 flags &= ~LIR_OpArrayCopy::dst_null_check; 844 if (length_limit != NULL && 845 dst_array->length() == length_limit && 846 is_constant_zero(dst_pos)) { 847 flags &= ~LIR_OpArrayCopy::dst_range_check; 848 } 849 } 850 851 // check from incoming constant values 852 if (positive_constant(src_pos)) 853 flags &= ~LIR_OpArrayCopy::src_pos_positive_check; 854 if (positive_constant(dst_pos)) 855 flags &= ~LIR_OpArrayCopy::dst_pos_positive_check; 856 if (positive_constant(length)) 857 flags &= ~LIR_OpArrayCopy::length_positive_check; 858 859 // see if the range check can be elided, which might also imply 860 // that src or dst is non-null. 861 ArrayLength* al = length->as_ArrayLength(); 862 if (al != NULL) { 863 if (al->array() == src) { 864 // it's the length of the source array 865 flags &= ~LIR_OpArrayCopy::length_positive_check; 866 flags &= ~LIR_OpArrayCopy::src_null_check; 867 if (is_constant_zero(src_pos)) 868 flags &= ~LIR_OpArrayCopy::src_range_check; 869 } 870 if (al->array() == dst) { 871 // it's the length of the destination array 872 flags &= ~LIR_OpArrayCopy::length_positive_check; 873 flags &= ~LIR_OpArrayCopy::dst_null_check; 874 if (is_constant_zero(dst_pos)) 875 flags &= ~LIR_OpArrayCopy::dst_range_check; 876 } 877 } 878 if (is_exact) { 879 flags &= ~LIR_OpArrayCopy::type_check; 880 } 881 } 882 883 IntConstant* src_int = src_pos->type()->as_IntConstant(); 884 IntConstant* dst_int = dst_pos->type()->as_IntConstant(); 885 if (src_int && dst_int) { 886 int s_offs = src_int->value(); 887 int d_offs = dst_int->value(); 888 if (src_int->value() >= dst_int->value()) { 889 flags &= ~LIR_OpArrayCopy::overlapping; 890 } 891 if (expected_type != NULL) { 892 BasicType t = expected_type->element_type()->basic_type(); 893 int element_size = type2aelembytes(t); 894 if (((arrayOopDesc::base_offset_in_bytes(t) + s_offs * element_size) % HeapWordSize == 0) && 895 ((arrayOopDesc::base_offset_in_bytes(t) + d_offs * element_size) % HeapWordSize == 0)) { 896 flags &= ~LIR_OpArrayCopy::unaligned; 897 } 898 } 899 } else if (src_pos == dst_pos || is_constant_zero(dst_pos)) { 900 // src and dest positions are the same, or dst is zero so assume 901 // nonoverlapping copy. 902 flags &= ~LIR_OpArrayCopy::overlapping; 903 } 904 905 if (src == dst) { 906 // moving within a single array so no type checks are needed 907 if (flags & LIR_OpArrayCopy::type_check) { 908 flags &= ~LIR_OpArrayCopy::type_check; 909 } 910 } 911 *flagsp = flags; 912 *expected_typep = (ciArrayKlass*)expected_type; 913 } 914 915 916 LIR_Opr LIRGenerator::round_item(LIR_Opr opr) { 917 assert(opr->is_register(), "why spill if item is not register?"); 918 919 if (RoundFPResults && UseSSE < 1 && opr->is_single_fpu()) { 920 LIR_Opr result = new_register(T_FLOAT); 921 set_vreg_flag(result, must_start_in_memory); 922 assert(opr->is_register(), "only a register can be spilled"); 923 assert(opr->value_type()->is_float(), "rounding only for floats available"); 924 __ roundfp(opr, LIR_OprFact::illegalOpr, result); 925 return result; 926 } 927 return opr; 928 } 929 930 931 LIR_Opr LIRGenerator::force_to_spill(LIR_Opr value, BasicType t) { 932 assert(type2size[t] == type2size[value->type()], 933 "size mismatch: t=%s, value->type()=%s", type2name(t), type2name(value->type())); 934 if (!value->is_register()) { 935 // force into a register 936 LIR_Opr r = new_register(value->type()); 937 __ move(value, r); 938 value = r; 939 } 940 941 // create a spill location 942 LIR_Opr tmp = new_register(t); 943 set_vreg_flag(tmp, LIRGenerator::must_start_in_memory); 944 945 // move from register to spill 946 __ move(value, tmp); 947 return tmp; 948 } 949 950 void LIRGenerator::profile_branch(If* if_instr, If::Condition cond) { 951 if (if_instr->should_profile()) { 952 ciMethod* method = if_instr->profiled_method(); 953 assert(method != NULL, "method should be set if branch is profiled"); 954 ciMethodData* md = method->method_data_or_null(); 955 assert(md != NULL, "Sanity"); 956 ciProfileData* data = md->bci_to_data(if_instr->profiled_bci()); 957 assert(data != NULL, "must have profiling data"); 958 assert(data->is_BranchData(), "need BranchData for two-way branches"); 959 int taken_count_offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); 960 int not_taken_count_offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); 961 if (if_instr->is_swapped()) { 962 int t = taken_count_offset; 963 taken_count_offset = not_taken_count_offset; 964 not_taken_count_offset = t; 965 } 966 967 LIR_Opr md_reg = new_register(T_METADATA); 968 __ metadata2reg(md->constant_encoding(), md_reg); 969 970 LIR_Opr data_offset_reg = new_pointer_register(); 971 __ cmove(lir_cond(cond), 972 LIR_OprFact::intptrConst(taken_count_offset), 973 LIR_OprFact::intptrConst(not_taken_count_offset), 974 data_offset_reg, as_BasicType(if_instr->x()->type())); 975 976 // MDO cells are intptr_t, so the data_reg width is arch-dependent. 977 LIR_Opr data_reg = new_pointer_register(); 978 LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type()); 979 __ move(data_addr, data_reg); 980 // Use leal instead of add to avoid destroying condition codes on x86 981 LIR_Address* fake_incr_value = new LIR_Address(data_reg, DataLayout::counter_increment, T_INT); 982 __ leal(LIR_OprFact::address(fake_incr_value), data_reg); 983 __ move(data_reg, data_addr); 984 } 985 } 986 987 // Phi technique: 988 // This is about passing live values from one basic block to the other. 989 // In code generated with Java it is rather rare that more than one 990 // value is on the stack from one basic block to the other. 991 // We optimize our technique for efficient passing of one value 992 // (of type long, int, double..) but it can be extended. 993 // When entering or leaving a basic block, all registers and all spill 994 // slots are release and empty. We use the released registers 995 // and spill slots to pass the live values from one block 996 // to the other. The topmost value, i.e., the value on TOS of expression 997 // stack is passed in registers. All other values are stored in spilling 998 // area. Every Phi has an index which designates its spill slot 999 // At exit of a basic block, we fill the register(s) and spill slots. 1000 // At entry of a basic block, the block_prolog sets up the content of phi nodes 1001 // and locks necessary registers and spilling slots. 1002 1003 1004 // move current value to referenced phi function 1005 void LIRGenerator::move_to_phi(PhiResolver* resolver, Value cur_val, Value sux_val) { 1006 Phi* phi = sux_val->as_Phi(); 1007 // cur_val can be null without phi being null in conjunction with inlining 1008 if (phi != NULL && cur_val != NULL && cur_val != phi && !phi->is_illegal()) { 1009 Phi* cur_phi = cur_val->as_Phi(); 1010 if (cur_phi != NULL && cur_phi->is_illegal()) { 1011 // Phi and local would need to get invalidated 1012 // (which is unexpected for Linear Scan). 1013 // But this case is very rare so we simply bail out. 1014 bailout("propagation of illegal phi"); 1015 return; 1016 } 1017 LIR_Opr operand = cur_val->operand(); 1018 if (operand->is_illegal()) { 1019 assert(cur_val->as_Constant() != NULL || cur_val->as_Local() != NULL, 1020 "these can be produced lazily"); 1021 operand = operand_for_instruction(cur_val); 1022 } 1023 resolver->move(operand, operand_for_instruction(phi)); 1024 } 1025 } 1026 1027 1028 // Moves all stack values into their PHI position 1029 void LIRGenerator::move_to_phi(ValueStack* cur_state) { 1030 BlockBegin* bb = block(); 1031 if (bb->number_of_sux() == 1) { 1032 BlockBegin* sux = bb->sux_at(0); 1033 assert(sux->number_of_preds() > 0, "invalid CFG"); 1034 1035 // a block with only one predecessor never has phi functions 1036 if (sux->number_of_preds() > 1) { 1037 int max_phis = cur_state->stack_size() + cur_state->locals_size(); 1038 PhiResolver resolver(this, _virtual_register_number + max_phis * 2); 1039 1040 ValueStack* sux_state = sux->state(); 1041 Value sux_value; 1042 int index; 1043 1044 assert(cur_state->scope() == sux_state->scope(), "not matching"); 1045 assert(cur_state->locals_size() == sux_state->locals_size(), "not matching"); 1046 assert(cur_state->stack_size() == sux_state->stack_size(), "not matching"); 1047 1048 for_each_stack_value(sux_state, index, sux_value) { 1049 move_to_phi(&resolver, cur_state->stack_at(index), sux_value); 1050 } 1051 1052 for_each_local_value(sux_state, index, sux_value) { 1053 move_to_phi(&resolver, cur_state->local_at(index), sux_value); 1054 } 1055 1056 assert(cur_state->caller_state() == sux_state->caller_state(), "caller states must be equal"); 1057 } 1058 } 1059 } 1060 1061 1062 LIR_Opr LIRGenerator::new_register(BasicType type) { 1063 int vreg = _virtual_register_number; 1064 // add a little fudge factor for the bailout, since the bailout is 1065 // only checked periodically. This gives a few extra registers to 1066 // hand out before we really run out, which helps us keep from 1067 // tripping over assertions. 1068 if (vreg + 20 >= LIR_OprDesc::vreg_max) { 1069 bailout("out of virtual registers"); 1070 if (vreg + 2 >= LIR_OprDesc::vreg_max) { 1071 // wrap it around 1072 _virtual_register_number = LIR_OprDesc::vreg_base; 1073 } 1074 } 1075 _virtual_register_number += 1; 1076 return LIR_OprFact::virtual_register(vreg, type); 1077 } 1078 1079 1080 // Try to lock using register in hint 1081 LIR_Opr LIRGenerator::rlock(Value instr) { 1082 return new_register(instr->type()); 1083 } 1084 1085 1086 // does an rlock and sets result 1087 LIR_Opr LIRGenerator::rlock_result(Value x) { 1088 LIR_Opr reg = rlock(x); 1089 set_result(x, reg); 1090 return reg; 1091 } 1092 1093 1094 // does an rlock and sets result 1095 LIR_Opr LIRGenerator::rlock_result(Value x, BasicType type) { 1096 LIR_Opr reg; 1097 switch (type) { 1098 case T_BYTE: 1099 case T_BOOLEAN: 1100 reg = rlock_byte(type); 1101 break; 1102 default: 1103 reg = rlock(x); 1104 break; 1105 } 1106 1107 set_result(x, reg); 1108 return reg; 1109 } 1110 1111 1112 //--------------------------------------------------------------------- 1113 ciObject* LIRGenerator::get_jobject_constant(Value value) { 1114 ObjectType* oc = value->type()->as_ObjectType(); 1115 if (oc) { 1116 return oc->constant_value(); 1117 } 1118 return NULL; 1119 } 1120 1121 1122 void LIRGenerator::do_ExceptionObject(ExceptionObject* x) { 1123 assert(block()->is_set(BlockBegin::exception_entry_flag), "ExceptionObject only allowed in exception handler block"); 1124 assert(block()->next() == x, "ExceptionObject must be first instruction of block"); 1125 1126 // no moves are created for phi functions at the begin of exception 1127 // handlers, so assign operands manually here 1128 for_each_phi_fun(block(), phi, 1129 if (!phi->is_illegal()) { operand_for_instruction(phi); }); 1130 1131 LIR_Opr thread_reg = getThreadPointer(); 1132 __ move_wide(new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT), 1133 exceptionOopOpr()); 1134 __ move_wide(LIR_OprFact::oopConst(NULL), 1135 new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT)); 1136 __ move_wide(LIR_OprFact::oopConst(NULL), 1137 new LIR_Address(thread_reg, in_bytes(JavaThread::exception_pc_offset()), T_OBJECT)); 1138 1139 LIR_Opr result = new_register(T_OBJECT); 1140 __ move(exceptionOopOpr(), result); 1141 set_result(x, result); 1142 } 1143 1144 1145 //---------------------------------------------------------------------- 1146 //---------------------------------------------------------------------- 1147 //---------------------------------------------------------------------- 1148 //---------------------------------------------------------------------- 1149 // visitor functions 1150 //---------------------------------------------------------------------- 1151 //---------------------------------------------------------------------- 1152 //---------------------------------------------------------------------- 1153 //---------------------------------------------------------------------- 1154 1155 void LIRGenerator::do_Phi(Phi* x) { 1156 // phi functions are never visited directly 1157 ShouldNotReachHere(); 1158 } 1159 1160 1161 // Code for a constant is generated lazily unless the constant is frequently used and can't be inlined. 1162 void LIRGenerator::do_Constant(Constant* x) { 1163 if (x->state_before() != NULL) { 1164 // Any constant with a ValueStack requires patching so emit the patch here 1165 LIR_Opr reg = rlock_result(x); 1166 CodeEmitInfo* info = state_for(x, x->state_before()); 1167 __ oop2reg_patch(NULL, reg, info); 1168 } else if (x->use_count() > 1 && !can_inline_as_constant(x)) { 1169 if (!x->is_pinned()) { 1170 // unpinned constants are handled specially so that they can be 1171 // put into registers when they are used multiple times within a 1172 // block. After the block completes their operand will be 1173 // cleared so that other blocks can't refer to that register. 1174 set_result(x, load_constant(x)); 1175 } else { 1176 LIR_Opr res = x->operand(); 1177 if (!res->is_valid()) { 1178 res = LIR_OprFact::value_type(x->type()); 1179 } 1180 if (res->is_constant()) { 1181 LIR_Opr reg = rlock_result(x); 1182 __ move(res, reg); 1183 } else { 1184 set_result(x, res); 1185 } 1186 } 1187 } else { 1188 set_result(x, LIR_OprFact::value_type(x->type())); 1189 } 1190 } 1191 1192 1193 void LIRGenerator::do_Local(Local* x) { 1194 // operand_for_instruction has the side effect of setting the result 1195 // so there's no need to do it here. 1196 operand_for_instruction(x); 1197 } 1198 1199 1200 void LIRGenerator::do_IfInstanceOf(IfInstanceOf* x) { 1201 Unimplemented(); 1202 } 1203 1204 1205 void LIRGenerator::do_Return(Return* x) { 1206 if (compilation()->env()->dtrace_method_probes()) { 1207 BasicTypeList signature; 1208 signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 1209 signature.append(T_METADATA); // Method* 1210 LIR_OprList* args = new LIR_OprList(); 1211 args->append(getThreadPointer()); 1212 LIR_Opr meth = new_register(T_METADATA); 1213 __ metadata2reg(method()->constant_encoding(), meth); 1214 args->append(meth); 1215 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL); 1216 } 1217 1218 if (x->type()->is_void()) { 1219 __ return_op(LIR_OprFact::illegalOpr); 1220 } else { 1221 LIR_Opr reg = result_register_for(x->type(), /*callee=*/true); 1222 LIRItem result(x->result(), this); 1223 1224 result.load_item_force(reg); 1225 __ return_op(result.result()); 1226 } 1227 set_no_result(x); 1228 } 1229 1230 // Examble: ref.get() 1231 // Combination of LoadField and g1 pre-write barrier 1232 void LIRGenerator::do_Reference_get(Intrinsic* x) { 1233 1234 const int referent_offset = java_lang_ref_Reference::referent_offset; 1235 guarantee(referent_offset > 0, "referent offset not initialized"); 1236 1237 assert(x->number_of_arguments() == 1, "wrong type"); 1238 1239 LIRItem reference(x->argument_at(0), this); 1240 reference.load_item(); 1241 1242 // need to perform the null check on the reference objecy 1243 CodeEmitInfo* info = NULL; 1244 if (x->needs_null_check()) { 1245 info = state_for(x); 1246 } 1247 1248 LIR_Opr result = rlock_result(x, T_OBJECT); 1249 access_load_at(IN_HEAP | ON_WEAK_OOP_REF, T_OBJECT, 1250 reference, LIR_OprFact::intConst(referent_offset), result); 1251 } 1252 1253 // Example: clazz.isInstance(object) 1254 void LIRGenerator::do_isInstance(Intrinsic* x) { 1255 assert(x->number_of_arguments() == 2, "wrong type"); 1256 1257 // TODO could try to substitute this node with an equivalent InstanceOf 1258 // if clazz is known to be a constant Class. This will pick up newly found 1259 // constants after HIR construction. I'll leave this to a future change. 1260 1261 // as a first cut, make a simple leaf call to runtime to stay platform independent. 1262 // could follow the aastore example in a future change. 1263 1264 LIRItem clazz(x->argument_at(0), this); 1265 LIRItem object(x->argument_at(1), this); 1266 clazz.load_item(); 1267 object.load_item(); 1268 LIR_Opr result = rlock_result(x); 1269 1270 // need to perform null check on clazz 1271 if (x->needs_null_check()) { 1272 CodeEmitInfo* info = state_for(x); 1273 __ null_check(clazz.result(), info); 1274 } 1275 1276 LIR_Opr call_result = call_runtime(clazz.value(), object.value(), 1277 CAST_FROM_FN_PTR(address, Runtime1::is_instance_of), 1278 x->type(), 1279 NULL); // NULL CodeEmitInfo results in a leaf call 1280 __ move(call_result, result); 1281 } 1282 1283 // Example: object.getClass () 1284 void LIRGenerator::do_getClass(Intrinsic* x) { 1285 assert(x->number_of_arguments() == 1, "wrong type"); 1286 1287 LIRItem rcvr(x->argument_at(0), this); 1288 rcvr.load_item(); 1289 LIR_Opr temp = new_register(T_METADATA); 1290 LIR_Opr result = rlock_result(x); 1291 1292 // need to perform the null check on the rcvr 1293 CodeEmitInfo* info = NULL; 1294 if (x->needs_null_check()) { 1295 info = state_for(x); 1296 } 1297 1298 // FIXME T_ADDRESS should actually be T_METADATA but it can't because the 1299 // meaning of these two is mixed up (see JDK-8026837). 1300 __ move(new LIR_Address(rcvr.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), temp, info); 1301 __ move_wide(new LIR_Address(temp, in_bytes(Klass::java_mirror_offset()), T_ADDRESS), temp); 1302 // mirror = ((OopHandle)mirror)->resolve(); 1303 access_load(IN_NATIVE, T_OBJECT, 1304 LIR_OprFact::address(new LIR_Address(temp, T_OBJECT)), result); 1305 } 1306 1307 // java.lang.Class::isPrimitive() 1308 void LIRGenerator::do_isPrimitive(Intrinsic* x) { 1309 assert(x->number_of_arguments() == 1, "wrong type"); 1310 1311 LIRItem rcvr(x->argument_at(0), this); 1312 rcvr.load_item(); 1313 LIR_Opr temp = new_register(T_METADATA); 1314 LIR_Opr result = rlock_result(x); 1315 1316 CodeEmitInfo* info = NULL; 1317 if (x->needs_null_check()) { 1318 info = state_for(x); 1319 } 1320 1321 __ move(new LIR_Address(rcvr.result(), java_lang_Class::klass_offset_in_bytes(), T_ADDRESS), temp, info); 1322 __ cmp(lir_cond_notEqual, temp, LIR_OprFact::intConst(0)); 1323 __ cmove(lir_cond_notEqual, LIR_OprFact::intConst(0), LIR_OprFact::intConst(1), result, T_BOOLEAN); 1324 } 1325 1326 1327 // Example: Thread.currentThread() 1328 void LIRGenerator::do_currentThread(Intrinsic* x) { 1329 assert(x->number_of_arguments() == 0, "wrong type"); 1330 LIR_Opr reg = rlock_result(x); 1331 __ move_wide(new LIR_Address(getThreadPointer(), in_bytes(JavaThread::threadObj_offset()), T_OBJECT), reg); 1332 } 1333 1334 1335 void LIRGenerator::do_RegisterFinalizer(Intrinsic* x) { 1336 assert(x->number_of_arguments() == 1, "wrong type"); 1337 LIRItem receiver(x->argument_at(0), this); 1338 1339 receiver.load_item(); 1340 BasicTypeList signature; 1341 signature.append(T_OBJECT); // receiver 1342 LIR_OprList* args = new LIR_OprList(); 1343 args->append(receiver.result()); 1344 CodeEmitInfo* info = state_for(x, x->state()); 1345 call_runtime(&signature, args, 1346 CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::register_finalizer_id)), 1347 voidType, info); 1348 1349 set_no_result(x); 1350 } 1351 1352 1353 //------------------------local access-------------------------------------- 1354 1355 LIR_Opr LIRGenerator::operand_for_instruction(Instruction* x) { 1356 if (x->operand()->is_illegal()) { 1357 Constant* c = x->as_Constant(); 1358 if (c != NULL) { 1359 x->set_operand(LIR_OprFact::value_type(c->type())); 1360 } else { 1361 assert(x->as_Phi() || x->as_Local() != NULL, "only for Phi and Local"); 1362 // allocate a virtual register for this local or phi 1363 x->set_operand(rlock(x)); 1364 _instruction_for_operand.at_put_grow(x->operand()->vreg_number(), x, NULL); 1365 } 1366 } 1367 return x->operand(); 1368 } 1369 1370 1371 Instruction* LIRGenerator::instruction_for_opr(LIR_Opr opr) { 1372 if (opr->is_virtual()) { 1373 return instruction_for_vreg(opr->vreg_number()); 1374 } 1375 return NULL; 1376 } 1377 1378 1379 Instruction* LIRGenerator::instruction_for_vreg(int reg_num) { 1380 if (reg_num < _instruction_for_operand.length()) { 1381 return _instruction_for_operand.at(reg_num); 1382 } 1383 return NULL; 1384 } 1385 1386 1387 void LIRGenerator::set_vreg_flag(int vreg_num, VregFlag f) { 1388 if (_vreg_flags.size_in_bits() == 0) { 1389 BitMap2D temp(100, num_vreg_flags); 1390 _vreg_flags = temp; 1391 } 1392 _vreg_flags.at_put_grow(vreg_num, f, true); 1393 } 1394 1395 bool LIRGenerator::is_vreg_flag_set(int vreg_num, VregFlag f) { 1396 if (!_vreg_flags.is_valid_index(vreg_num, f)) { 1397 return false; 1398 } 1399 return _vreg_flags.at(vreg_num, f); 1400 } 1401 1402 1403 // Block local constant handling. This code is useful for keeping 1404 // unpinned constants and constants which aren't exposed in the IR in 1405 // registers. Unpinned Constant instructions have their operands 1406 // cleared when the block is finished so that other blocks can't end 1407 // up referring to their registers. 1408 1409 LIR_Opr LIRGenerator::load_constant(Constant* x) { 1410 assert(!x->is_pinned(), "only for unpinned constants"); 1411 _unpinned_constants.append(x); 1412 return load_constant(LIR_OprFact::value_type(x->type())->as_constant_ptr()); 1413 } 1414 1415 1416 LIR_Opr LIRGenerator::load_constant(LIR_Const* c) { 1417 BasicType t = c->type(); 1418 for (int i = 0; i < _constants.length(); i++) { 1419 LIR_Const* other = _constants.at(i); 1420 if (t == other->type()) { 1421 switch (t) { 1422 case T_INT: 1423 case T_FLOAT: 1424 if (c->as_jint_bits() != other->as_jint_bits()) continue; 1425 break; 1426 case T_LONG: 1427 case T_DOUBLE: 1428 if (c->as_jint_hi_bits() != other->as_jint_hi_bits()) continue; 1429 if (c->as_jint_lo_bits() != other->as_jint_lo_bits()) continue; 1430 break; 1431 case T_OBJECT: 1432 if (c->as_jobject() != other->as_jobject()) continue; 1433 break; 1434 default: 1435 break; 1436 } 1437 return _reg_for_constants.at(i); 1438 } 1439 } 1440 1441 LIR_Opr result = new_register(t); 1442 __ move((LIR_Opr)c, result); 1443 _constants.append(c); 1444 _reg_for_constants.append(result); 1445 return result; 1446 } 1447 1448 //------------------------field access-------------------------------------- 1449 1450 void LIRGenerator::do_CompareAndSwap(Intrinsic* x, ValueType* type) { 1451 assert(x->number_of_arguments() == 4, "wrong type"); 1452 LIRItem obj (x->argument_at(0), this); // object 1453 LIRItem offset(x->argument_at(1), this); // offset of field 1454 LIRItem cmp (x->argument_at(2), this); // value to compare with field 1455 LIRItem val (x->argument_at(3), this); // replace field with val if matches cmp 1456 assert(obj.type()->tag() == objectTag, "invalid type"); 1457 1458 // In 64bit the type can be long, sparc doesn't have this assert 1459 // assert(offset.type()->tag() == intTag, "invalid type"); 1460 1461 assert(cmp.type()->tag() == type->tag(), "invalid type"); 1462 assert(val.type()->tag() == type->tag(), "invalid type"); 1463 1464 LIR_Opr result = access_atomic_cmpxchg_at(IN_HEAP, as_BasicType(type), 1465 obj, offset, cmp, val); 1466 set_result(x, result); 1467 } 1468 1469 // Comment copied form templateTable_i486.cpp 1470 // ---------------------------------------------------------------------------- 1471 // Volatile variables demand their effects be made known to all CPU's in 1472 // order. Store buffers on most chips allow reads & writes to reorder; the 1473 // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of 1474 // memory barrier (i.e., it's not sufficient that the interpreter does not 1475 // reorder volatile references, the hardware also must not reorder them). 1476 // 1477 // According to the new Java Memory Model (JMM): 1478 // (1) All volatiles are serialized wrt to each other. 1479 // ALSO reads & writes act as aquire & release, so: 1480 // (2) A read cannot let unrelated NON-volatile memory refs that happen after 1481 // the read float up to before the read. It's OK for non-volatile memory refs 1482 // that happen before the volatile read to float down below it. 1483 // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs 1484 // that happen BEFORE the write float down to after the write. It's OK for 1485 // non-volatile memory refs that happen after the volatile write to float up 1486 // before it. 1487 // 1488 // We only put in barriers around volatile refs (they are expensive), not 1489 // _between_ memory refs (that would require us to track the flavor of the 1490 // previous memory refs). Requirements (2) and (3) require some barriers 1491 // before volatile stores and after volatile loads. These nearly cover 1492 // requirement (1) but miss the volatile-store-volatile-load case. This final 1493 // case is placed after volatile-stores although it could just as well go 1494 // before volatile-loads. 1495 1496 1497 void LIRGenerator::do_StoreField(StoreField* x) { 1498 bool needs_patching = x->needs_patching(); 1499 bool is_volatile = x->field()->is_volatile(); 1500 BasicType field_type = x->field_type(); 1501 1502 CodeEmitInfo* info = NULL; 1503 if (needs_patching) { 1504 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1505 info = state_for(x, x->state_before()); 1506 } else if (x->needs_null_check()) { 1507 NullCheck* nc = x->explicit_null_check(); 1508 if (nc == NULL) { 1509 info = state_for(x); 1510 } else { 1511 info = state_for(nc); 1512 } 1513 } 1514 1515 LIRItem object(x->obj(), this); 1516 LIRItem value(x->value(), this); 1517 1518 object.load_item(); 1519 1520 if (is_volatile || needs_patching) { 1521 // load item if field is volatile (fewer special cases for volatiles) 1522 // load item if field not initialized 1523 // load item if field not constant 1524 // because of code patching we cannot inline constants 1525 if (field_type == T_BYTE || field_type == T_BOOLEAN) { 1526 value.load_byte_item(); 1527 } else { 1528 value.load_item(); 1529 } 1530 } else { 1531 value.load_for_store(field_type); 1532 } 1533 1534 set_no_result(x); 1535 1536 #ifndef PRODUCT 1537 if (PrintNotLoaded && needs_patching) { 1538 tty->print_cr(" ###class not loaded at store_%s bci %d", 1539 x->is_static() ? "static" : "field", x->printable_bci()); 1540 } 1541 #endif 1542 1543 if (x->needs_null_check() && 1544 (needs_patching || 1545 MacroAssembler::needs_explicit_null_check(x->offset()))) { 1546 if (needs_patching && x->field()->is_never_null()) { 1547 // We are storing a field of type "QT;", but T is not yet loaded, so we don't 1548 // know whether this field is flattened or not. Let's deoptimize and recompile. 1549 CodeStub* stub = new DeoptimizeStub(new CodeEmitInfo(info), 1550 Deoptimization::Reason_unloaded, 1551 Deoptimization::Action_make_not_entrant); 1552 __ branch(lir_cond_always, T_ILLEGAL, stub); 1553 } else { 1554 // Emit an explicit null check because the offset is too large. 1555 // If the class is not loaded and the object is NULL, we need to deoptimize to throw a 1556 // NoClassDefFoundError in the interpreter instead of an implicit NPE from compiled code. 1557 __ null_check(object.result(), new CodeEmitInfo(info), /* deoptimize */ needs_patching); 1558 } 1559 } 1560 1561 DecoratorSet decorators = IN_HEAP; 1562 if (is_volatile) { 1563 decorators |= MO_SEQ_CST; 1564 } 1565 if (needs_patching) { 1566 decorators |= C1_NEEDS_PATCHING; 1567 } 1568 1569 access_store_at(decorators, field_type, object, LIR_OprFact::intConst(x->offset()), 1570 value.result(), info != NULL ? new CodeEmitInfo(info) : NULL, info); 1571 } 1572 1573 // FIXME -- I can't find any other way to pass an address to access_load_at(). 1574 class TempResolvedAddress: public Instruction { 1575 public: 1576 TempResolvedAddress(ValueType* type, LIR_Opr addr) : Instruction(type) { 1577 set_operand(addr); 1578 } 1579 virtual void input_values_do(ValueVisitor*) {} 1580 virtual void visit(InstructionVisitor* v) {} 1581 virtual const char* name() const { return "TempResolvedAddress"; } 1582 }; 1583 1584 void LIRGenerator::access_flattened_array(bool is_load, LIRItem& array, LIRItem& index, LIRItem& obj_item) { 1585 // Find the starting address of the source (inside the array) 1586 ciType* array_type = array.value()->declared_type(); 1587 ciValueArrayKlass* value_array_klass = array_type->as_value_array_klass(); 1588 assert(value_array_klass->is_loaded(), "must be"); 1589 1590 ciValueKlass* elem_klass = value_array_klass->element_klass()->as_value_klass(); 1591 int array_header_size = value_array_klass->array_header_in_bytes(); 1592 int shift = value_array_klass->log2_element_size(); 1593 1594 #ifndef _LP64 1595 LIR_Opr index_op = new_register(T_INT); 1596 // FIXME -- on 32-bit, the shift below can overflow, so we need to check that 1597 // the top (shift+1) bits of index_op must be zero, or 1598 // else throw ArrayIndexOutOfBoundsException 1599 if (index.result()->is_constant()) { 1600 jint const_index = index.result()->as_jint(); 1601 __ move(LIR_OprFact::intConst(const_index << shift), index_op); 1602 } else { 1603 __ shift_left(index_op, shift, index.result()); 1604 } 1605 #else 1606 LIR_Opr index_op = new_register(T_LONG); 1607 if (index.result()->is_constant()) { 1608 jint const_index = index.result()->as_jint(); 1609 __ move(LIR_OprFact::longConst(const_index << shift), index_op); 1610 } else { 1611 __ convert(Bytecodes::_i2l, index.result(), index_op); 1612 // Need to shift manually, as LIR_Address can scale only up to 3. 1613 __ shift_left(index_op, shift, index_op); 1614 } 1615 #endif 1616 1617 LIR_Opr elm_op = new_pointer_register(); 1618 LIR_Address* elm_address = new LIR_Address(array.result(), index_op, array_header_size, T_ADDRESS); 1619 __ leal(LIR_OprFact::address(elm_address), elm_op); 1620 1621 for (int i = 0; i < elem_klass->nof_nonstatic_fields(); i++) { 1622 ciField* inner_field = elem_klass->nonstatic_field_at(i); 1623 assert(!inner_field->is_flattened(), "flattened fields must have been expanded"); 1624 int obj_offset = inner_field->offset(); 1625 int elm_offset = obj_offset - elem_klass->first_field_offset(); // object header is not stored in array. 1626 1627 BasicType field_type = inner_field->type()->basic_type(); 1628 switch (field_type) { 1629 case T_BYTE: 1630 case T_BOOLEAN: 1631 case T_SHORT: 1632 case T_CHAR: 1633 field_type = T_INT; 1634 break; 1635 default: 1636 break; 1637 } 1638 1639 LIR_Opr temp = new_register(field_type); 1640 TempResolvedAddress* elm_resolved_addr = new TempResolvedAddress(as_ValueType(field_type), elm_op); 1641 LIRItem elm_item(elm_resolved_addr, this); 1642 1643 DecoratorSet decorators = IN_HEAP; 1644 if (is_load) { 1645 access_load_at(decorators, field_type, 1646 elm_item, LIR_OprFact::intConst(elm_offset), temp, 1647 NULL, NULL); 1648 access_store_at(decorators, field_type, 1649 obj_item, LIR_OprFact::intConst(obj_offset), temp, 1650 NULL, NULL); 1651 } else { 1652 access_load_at(decorators, field_type, 1653 obj_item, LIR_OprFact::intConst(obj_offset), temp, 1654 NULL, NULL); 1655 access_store_at(decorators, field_type, 1656 elm_item, LIR_OprFact::intConst(elm_offset), temp, 1657 NULL, NULL); 1658 } 1659 } 1660 } 1661 1662 void LIRGenerator::check_flattened_array(LIRItem& array, CodeStub* slow_path) { 1663 LIR_Opr array_klass_reg = new_register(T_METADATA); 1664 1665 __ move(new LIR_Address(array.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), array_klass_reg); 1666 LIR_Opr layout = new_register(T_INT); 1667 __ move(new LIR_Address(array_klass_reg, in_bytes(Klass::layout_helper_offset()), T_INT), layout); 1668 __ shift_right(layout, Klass::_lh_array_tag_shift, layout); 1669 __ cmp(lir_cond_equal, layout, LIR_OprFact::intConst(Klass::_lh_array_tag_vt_value)); 1670 __ branch(lir_cond_equal, T_ILLEGAL, slow_path); 1671 } 1672 1673 bool LIRGenerator::needs_flattened_array_store_check(StoreIndexed* x) { 1674 if (ValueArrayFlatten && x->elt_type() == T_OBJECT && x->array()->maybe_flattened_array()) { 1675 ciType* type = x->value()->declared_type(); 1676 if (type != NULL && type->is_klass()) { 1677 ciKlass* klass = type->as_klass(); 1678 if (klass->is_loaded() && 1679 !(klass->is_valuetype() && klass->as_value_klass()->flatten_array()) && 1680 !klass->is_java_lang_Object() && 1681 !klass->is_interface()) { 1682 // This is known to be a non-flattenable object. If the array is flattened, 1683 // it will be caught by the code generated by array_store_check(). 1684 return false; 1685 } 1686 } 1687 // We're not 100% sure, so let's do the flattened_array_store_check. 1688 return true; 1689 } 1690 return false; 1691 } 1692 1693 void LIRGenerator::do_StoreIndexed(StoreIndexed* x) { 1694 assert(x->is_pinned(),""); 1695 assert(x->elt_type() != T_ARRAY, "never used"); 1696 bool is_loaded_flattened_array = x->array()->is_loaded_flattened_array(); 1697 bool needs_range_check = x->compute_needs_range_check(); 1698 bool use_length = x->length() != NULL; 1699 bool obj_store = x->elt_type() == T_OBJECT; 1700 bool needs_store_check = obj_store && !is_loaded_flattened_array && 1701 (x->value()->as_Constant() == NULL || 1702 !get_jobject_constant(x->value())->is_null_object() || 1703 x->should_profile()); 1704 1705 LIRItem array(x->array(), this); 1706 LIRItem index(x->index(), this); 1707 LIRItem value(x->value(), this); 1708 LIRItem length(this); 1709 1710 array.load_item(); 1711 index.load_nonconstant(); 1712 1713 if (use_length && needs_range_check) { 1714 length.set_instruction(x->length()); 1715 length.load_item(); 1716 } 1717 1718 if (needs_store_check || x->check_boolean() 1719 || is_loaded_flattened_array || needs_flattened_array_store_check(x)) { 1720 value.load_item(); 1721 } else { 1722 value.load_for_store(x->elt_type()); 1723 } 1724 1725 set_no_result(x); 1726 1727 // the CodeEmitInfo must be duplicated for each different 1728 // LIR-instruction because spilling can occur anywhere between two 1729 // instructions and so the debug information must be different 1730 CodeEmitInfo* range_check_info = state_for(x); 1731 CodeEmitInfo* null_check_info = NULL; 1732 if (x->needs_null_check()) { 1733 null_check_info = new CodeEmitInfo(range_check_info); 1734 } 1735 1736 if (GenerateRangeChecks && needs_range_check) { 1737 if (use_length) { 1738 __ cmp(lir_cond_belowEqual, length.result(), index.result()); 1739 __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result(), array.result())); 1740 } else { 1741 array_range_check(array.result(), index.result(), null_check_info, range_check_info); 1742 // range_check also does the null check 1743 null_check_info = NULL; 1744 } 1745 } 1746 1747 if (GenerateArrayStoreCheck && needs_store_check) { 1748 CodeEmitInfo* store_check_info = new CodeEmitInfo(range_check_info); 1749 array_store_check(value.result(), array.result(), store_check_info, x->profiled_method(), x->profiled_bci()); 1750 } 1751 1752 if (is_loaded_flattened_array) { 1753 if (!x->is_exact_flattened_array_store()) { 1754 CodeEmitInfo* info = new CodeEmitInfo(range_check_info); 1755 ciKlass* element_klass = x->array()->declared_type()->as_value_array_klass()->element_klass(); 1756 flattened_array_store_check(value.result(), element_klass, info); 1757 } else if (!x->value()->is_never_null()) { 1758 __ null_check(value.result(), new CodeEmitInfo(range_check_info)); 1759 } 1760 access_flattened_array(false, array, index, value); 1761 } else { 1762 StoreFlattenedArrayStub* slow_path = NULL; 1763 1764 if (needs_flattened_array_store_check(x)) { 1765 // Check if we indeed have a flattened array 1766 index.load_item(); 1767 slow_path = new StoreFlattenedArrayStub(array.result(), index.result(), value.result(), state_for(x)); 1768 check_flattened_array(array, slow_path); 1769 } 1770 1771 DecoratorSet decorators = IN_HEAP | IS_ARRAY; 1772 if (x->check_boolean()) { 1773 decorators |= C1_MASK_BOOLEAN; 1774 } 1775 1776 access_store_at(decorators, x->elt_type(), array, index.result(), value.result(), 1777 NULL, null_check_info); 1778 if (slow_path != NULL) { 1779 __ branch_destination(slow_path->continuation()); 1780 } 1781 } 1782 } 1783 1784 void LIRGenerator::access_load_at(DecoratorSet decorators, BasicType type, 1785 LIRItem& base, LIR_Opr offset, LIR_Opr result, 1786 CodeEmitInfo* patch_info, CodeEmitInfo* load_emit_info) { 1787 decorators |= ACCESS_READ; 1788 LIRAccess access(this, decorators, base, offset, type, patch_info, load_emit_info); 1789 if (access.is_raw()) { 1790 _barrier_set->BarrierSetC1::load_at(access, result); 1791 } else { 1792 _barrier_set->load_at(access, result); 1793 } 1794 } 1795 1796 void LIRGenerator::access_load(DecoratorSet decorators, BasicType type, 1797 LIR_Opr addr, LIR_Opr result) { 1798 decorators |= ACCESS_READ; 1799 LIRAccess access(this, decorators, LIR_OprFact::illegalOpr, LIR_OprFact::illegalOpr, type); 1800 access.set_resolved_addr(addr); 1801 if (access.is_raw()) { 1802 _barrier_set->BarrierSetC1::load(access, result); 1803 } else { 1804 _barrier_set->load(access, result); 1805 } 1806 } 1807 1808 void LIRGenerator::access_store_at(DecoratorSet decorators, BasicType type, 1809 LIRItem& base, LIR_Opr offset, LIR_Opr value, 1810 CodeEmitInfo* patch_info, CodeEmitInfo* store_emit_info) { 1811 decorators |= ACCESS_WRITE; 1812 LIRAccess access(this, decorators, base, offset, type, patch_info, store_emit_info); 1813 if (access.is_raw()) { 1814 _barrier_set->BarrierSetC1::store_at(access, value); 1815 } else { 1816 _barrier_set->store_at(access, value); 1817 } 1818 } 1819 1820 LIR_Opr LIRGenerator::access_atomic_cmpxchg_at(DecoratorSet decorators, BasicType type, 1821 LIRItem& base, LIRItem& offset, LIRItem& cmp_value, LIRItem& new_value) { 1822 decorators |= ACCESS_READ; 1823 decorators |= ACCESS_WRITE; 1824 // Atomic operations are SEQ_CST by default 1825 decorators |= ((decorators & MO_DECORATOR_MASK) != 0) ? MO_SEQ_CST : 0; 1826 LIRAccess access(this, decorators, base, offset, type); 1827 if (access.is_raw()) { 1828 return _barrier_set->BarrierSetC1::atomic_cmpxchg_at(access, cmp_value, new_value); 1829 } else { 1830 return _barrier_set->atomic_cmpxchg_at(access, cmp_value, new_value); 1831 } 1832 } 1833 1834 LIR_Opr LIRGenerator::access_atomic_xchg_at(DecoratorSet decorators, BasicType type, 1835 LIRItem& base, LIRItem& offset, LIRItem& value) { 1836 decorators |= ACCESS_READ; 1837 decorators |= ACCESS_WRITE; 1838 // Atomic operations are SEQ_CST by default 1839 decorators |= ((decorators & MO_DECORATOR_MASK) != 0) ? MO_SEQ_CST : 0; 1840 LIRAccess access(this, decorators, base, offset, type); 1841 if (access.is_raw()) { 1842 return _barrier_set->BarrierSetC1::atomic_xchg_at(access, value); 1843 } else { 1844 return _barrier_set->atomic_xchg_at(access, value); 1845 } 1846 } 1847 1848 LIR_Opr LIRGenerator::access_atomic_add_at(DecoratorSet decorators, BasicType type, 1849 LIRItem& base, LIRItem& offset, LIRItem& value) { 1850 decorators |= ACCESS_READ; 1851 decorators |= ACCESS_WRITE; 1852 // Atomic operations are SEQ_CST by default 1853 decorators |= ((decorators & MO_DECORATOR_MASK) != 0) ? MO_SEQ_CST : 0; 1854 LIRAccess access(this, decorators, base, offset, type); 1855 if (access.is_raw()) { 1856 return _barrier_set->BarrierSetC1::atomic_add_at(access, value); 1857 } else { 1858 return _barrier_set->atomic_add_at(access, value); 1859 } 1860 } 1861 1862 LIR_Opr LIRGenerator::access_resolve(DecoratorSet decorators, LIR_Opr obj) { 1863 // Use stronger ACCESS_WRITE|ACCESS_READ by default. 1864 if ((decorators & (ACCESS_READ | ACCESS_WRITE)) == 0) { 1865 decorators |= ACCESS_READ | ACCESS_WRITE; 1866 } 1867 1868 return _barrier_set->resolve(this, decorators, obj); 1869 } 1870 1871 Value LIRGenerator::non_nullable_load_field_prolog(LoadField* x, CodeEmitInfo* info) { 1872 ciField* field = x->field(); 1873 ciInstanceKlass* holder = field->holder(); 1874 Value default_value = NULL; 1875 1876 // Unloaded "QV;" klasses are represented by a ciInstanceKlass 1877 bool field_type_unloaded = field->type()->is_instance_klass() && !field->type()->as_instance_klass()->is_loaded(); 1878 1879 // Check for edge cases (1), (2) and (3) for getstatic and getfield 1880 bool deopt = false; 1881 bool need_default = false; 1882 if (field->is_static()) { 1883 // (1) holder is unloaded -- no problem: it will be loaded by patching, and field offset will be determined. 1884 1885 if (field_type_unloaded) { 1886 // (2) field type is unloaded -- problem: we don't know what the default value is. Let's deopt. 1887 // FIXME: consider getting the default value in patching code. 1888 deopt = true; 1889 } else { 1890 need_default = true; 1891 } 1892 1893 // (3) field is not flattenable -- we don't care: static fields are never flattened. 1894 } else { 1895 if (!holder->is_loaded()) { 1896 // (1) holder is unloaded -- problem: we needed the field offset back in GraphBuilder::access_field() 1897 // FIXME: consider getting field offset in patching code (but only if the field 1898 // type was loaded at compilation time). 1899 deopt = true; 1900 } else if (field_type_unloaded) { 1901 // (2) field type is unloaded -- problem: we don't whether it's flattened or not. Let's deopt 1902 deopt = true; 1903 } else if (!field->is_flattened()) { 1904 // (3) field is not flattenable -- need default value in cases of uninitialized field 1905 need_default = true; 1906 } 1907 } 1908 1909 assert(!(deopt && need_default), "cannot both be true"); 1910 1911 if (deopt) { 1912 assert(x->needs_patching(), "must be"); 1913 assert(info != NULL, "must be"); 1914 CodeStub* stub = new DeoptimizeStub(new CodeEmitInfo(info), 1915 Deoptimization::Reason_unloaded, 1916 Deoptimization::Action_make_not_entrant); 1917 __ branch(lir_cond_always, T_ILLEGAL, stub); 1918 } else if (need_default) { 1919 assert(!field_type_unloaded, "must be"); 1920 assert(field->type()->is_valuetype(), "must be"); 1921 ciValueKlass* value_klass = field->type()->as_value_klass(); 1922 assert(value_klass->is_loaded(), "must be"); 1923 1924 if (field->is_static() && holder->is_loaded()) { 1925 ciInstance* mirror = field->holder()->java_mirror(); 1926 ciObject* val = mirror->field_value(field).as_object(); 1927 if (val->is_null_object()) { 1928 // This is a non-nullable static field, but it's not initialized. 1929 // We need to do a null check, and replace it with the default value. 1930 } else { 1931 // No need to perform null check on this static field 1932 need_default = false; 1933 } 1934 } 1935 1936 if (need_default) { 1937 default_value = new Constant(new InstanceConstant(value_klass->default_value_instance())); 1938 } 1939 } 1940 1941 return default_value; 1942 } 1943 1944 void LIRGenerator::do_LoadField(LoadField* x) { 1945 bool needs_patching = x->needs_patching(); 1946 bool is_volatile = x->field()->is_volatile(); 1947 BasicType field_type = x->field_type(); 1948 1949 CodeEmitInfo* info = NULL; 1950 if (needs_patching) { 1951 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1952 info = state_for(x, x->state_before()); 1953 } else if (x->needs_null_check()) { 1954 NullCheck* nc = x->explicit_null_check(); 1955 if (nc == NULL) { 1956 info = state_for(x); 1957 } else { 1958 info = state_for(nc); 1959 } 1960 } 1961 1962 LIRItem object(x->obj(), this); 1963 1964 object.load_item(); 1965 1966 #ifndef PRODUCT 1967 if (PrintNotLoaded && needs_patching) { 1968 tty->print_cr(" ###class not loaded at load_%s bci %d", 1969 x->is_static() ? "static" : "field", x->printable_bci()); 1970 } 1971 #endif 1972 1973 Value default_value = NULL; 1974 if (x->field()->is_never_null()) { 1975 default_value = non_nullable_load_field_prolog(x, info); 1976 } 1977 1978 bool stress_deopt = StressLoopInvariantCodeMotion && info && info->deoptimize_on_exception(); 1979 if (x->needs_null_check() && 1980 (needs_patching || 1981 MacroAssembler::needs_explicit_null_check(x->offset()) || 1982 stress_deopt)) { 1983 LIR_Opr obj = object.result(); 1984 if (stress_deopt) { 1985 obj = new_register(T_OBJECT); 1986 __ move(LIR_OprFact::oopConst(NULL), obj); 1987 } 1988 // Emit an explicit null check because the offset is too large. 1989 // If the class is not loaded and the object is NULL, we need to deoptimize to throw a 1990 // NoClassDefFoundError in the interpreter instead of an implicit NPE from compiled code. 1991 __ null_check(obj, new CodeEmitInfo(info), /* deoptimize */ needs_patching); 1992 } 1993 1994 DecoratorSet decorators = IN_HEAP; 1995 if (is_volatile) { 1996 decorators |= MO_SEQ_CST; 1997 } 1998 if (needs_patching) { 1999 decorators |= C1_NEEDS_PATCHING; 2000 } 2001 2002 LIR_Opr result = rlock_result(x, field_type); 2003 access_load_at(decorators, field_type, 2004 object, LIR_OprFact::intConst(x->offset()), result, 2005 info ? new CodeEmitInfo(info) : NULL, info); 2006 2007 if (default_value != NULL) { 2008 LabelObj* L_end = new LabelObj(); 2009 __ cmp(lir_cond_notEqual, result, LIR_OprFact::oopConst(NULL)); 2010 __ branch(lir_cond_notEqual, T_OBJECT, L_end->label()); 2011 2012 LIRItem dv(default_value, this); 2013 dv.load_item(); 2014 __ move(dv.result(), result); 2015 2016 __ branch_destination(L_end->label()); 2017 } 2018 } 2019 2020 2021 //------------------------java.nio.Buffer.checkIndex------------------------ 2022 2023 // int java.nio.Buffer.checkIndex(int) 2024 void LIRGenerator::do_NIOCheckIndex(Intrinsic* x) { 2025 // NOTE: by the time we are in checkIndex() we are guaranteed that 2026 // the buffer is non-null (because checkIndex is package-private and 2027 // only called from within other methods in the buffer). 2028 assert(x->number_of_arguments() == 2, "wrong type"); 2029 LIRItem buf (x->argument_at(0), this); 2030 LIRItem index(x->argument_at(1), this); 2031 buf.load_item(); 2032 index.load_item(); 2033 2034 LIR_Opr result = rlock_result(x); 2035 if (GenerateRangeChecks) { 2036 CodeEmitInfo* info = state_for(x); 2037 CodeStub* stub = new RangeCheckStub(info, index.result()); 2038 LIR_Opr buf_obj = access_resolve(IS_NOT_NULL | ACCESS_READ, buf.result()); 2039 if (index.result()->is_constant()) { 2040 cmp_mem_int(lir_cond_belowEqual, buf_obj, java_nio_Buffer::limit_offset(), index.result()->as_jint(), info); 2041 __ branch(lir_cond_belowEqual, T_INT, stub); 2042 } else { 2043 cmp_reg_mem(lir_cond_aboveEqual, index.result(), buf_obj, 2044 java_nio_Buffer::limit_offset(), T_INT, info); 2045 __ branch(lir_cond_aboveEqual, T_INT, stub); 2046 } 2047 __ move(index.result(), result); 2048 } else { 2049 // Just load the index into the result register 2050 __ move(index.result(), result); 2051 } 2052 } 2053 2054 2055 //------------------------array access-------------------------------------- 2056 2057 2058 void LIRGenerator::do_ArrayLength(ArrayLength* x) { 2059 LIRItem array(x->array(), this); 2060 array.load_item(); 2061 LIR_Opr reg = rlock_result(x); 2062 2063 CodeEmitInfo* info = NULL; 2064 if (x->needs_null_check()) { 2065 NullCheck* nc = x->explicit_null_check(); 2066 if (nc == NULL) { 2067 info = state_for(x); 2068 } else { 2069 info = state_for(nc); 2070 } 2071 if (StressLoopInvariantCodeMotion && info->deoptimize_on_exception()) { 2072 LIR_Opr obj = new_register(T_OBJECT); 2073 __ move(LIR_OprFact::oopConst(NULL), obj); 2074 __ null_check(obj, new CodeEmitInfo(info)); 2075 } 2076 } 2077 __ load(new LIR_Address(array.result(), arrayOopDesc::length_offset_in_bytes(), T_INT), reg, info, lir_patch_none); 2078 } 2079 2080 2081 void LIRGenerator::do_LoadIndexed(LoadIndexed* x) { 2082 bool use_length = x->length() != NULL; 2083 LIRItem array(x->array(), this); 2084 LIRItem index(x->index(), this); 2085 LIRItem length(this); 2086 bool needs_range_check = x->compute_needs_range_check(); 2087 2088 if (use_length && needs_range_check) { 2089 length.set_instruction(x->length()); 2090 length.load_item(); 2091 } 2092 2093 array.load_item(); 2094 if (index.is_constant() && can_inline_as_constant(x->index())) { 2095 // let it be a constant 2096 index.dont_load_item(); 2097 } else { 2098 index.load_item(); 2099 } 2100 2101 CodeEmitInfo* range_check_info = state_for(x); 2102 CodeEmitInfo* null_check_info = NULL; 2103 if (x->needs_null_check()) { 2104 NullCheck* nc = x->explicit_null_check(); 2105 if (nc != NULL) { 2106 null_check_info = state_for(nc); 2107 } else { 2108 null_check_info = range_check_info; 2109 } 2110 if (StressLoopInvariantCodeMotion && null_check_info->deoptimize_on_exception()) { 2111 LIR_Opr obj = new_register(T_OBJECT); 2112 __ move(LIR_OprFact::oopConst(NULL), obj); 2113 __ null_check(obj, new CodeEmitInfo(null_check_info)); 2114 } 2115 } 2116 2117 if (GenerateRangeChecks && needs_range_check) { 2118 if (StressLoopInvariantCodeMotion && range_check_info->deoptimize_on_exception()) { 2119 __ branch(lir_cond_always, T_ILLEGAL, new RangeCheckStub(range_check_info, index.result(), array.result())); 2120 } else if (use_length) { 2121 // TODO: use a (modified) version of array_range_check that does not require a 2122 // constant length to be loaded to a register 2123 __ cmp(lir_cond_belowEqual, length.result(), index.result()); 2124 __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result(), array.result())); 2125 } else { 2126 array_range_check(array.result(), index.result(), null_check_info, range_check_info); 2127 // The range check performs the null check, so clear it out for the load 2128 null_check_info = NULL; 2129 } 2130 } 2131 2132 if (x->array()->is_loaded_flattened_array()) { 2133 // Find the destination address (of the NewValueTypeInstance) 2134 LIR_Opr obj = x->vt()->operand(); 2135 LIRItem obj_item(x->vt(), this); 2136 2137 access_flattened_array(true, array, index, obj_item); 2138 set_no_result(x); 2139 } else { 2140 LIR_Opr result = rlock_result(x, x->elt_type()); 2141 LoadFlattenedArrayStub* slow_path = NULL; 2142 2143 if (x->elt_type() == T_OBJECT && x->array()->maybe_flattened_array()) { 2144 index.load_item(); 2145 // if we are loading from flattened array, load it using a runtime call 2146 slow_path = new LoadFlattenedArrayStub(array.result(), index.result(), result, state_for(x)); 2147 check_flattened_array(array, slow_path); 2148 } 2149 2150 DecoratorSet decorators = IN_HEAP | IS_ARRAY; 2151 access_load_at(decorators, x->elt_type(), 2152 array, index.result(), result, 2153 NULL, null_check_info); 2154 2155 if (slow_path != NULL) { 2156 __ branch_destination(slow_path->continuation()); 2157 } 2158 } 2159 } 2160 2161 2162 void LIRGenerator::do_NullCheck(NullCheck* x) { 2163 if (x->can_trap()) { 2164 LIRItem value(x->obj(), this); 2165 value.load_item(); 2166 CodeEmitInfo* info = state_for(x); 2167 __ null_check(value.result(), info); 2168 } 2169 } 2170 2171 2172 void LIRGenerator::do_TypeCast(TypeCast* x) { 2173 LIRItem value(x->obj(), this); 2174 value.load_item(); 2175 // the result is the same as from the node we are casting 2176 set_result(x, value.result()); 2177 } 2178 2179 2180 void LIRGenerator::do_Throw(Throw* x) { 2181 LIRItem exception(x->exception(), this); 2182 exception.load_item(); 2183 set_no_result(x); 2184 LIR_Opr exception_opr = exception.result(); 2185 CodeEmitInfo* info = state_for(x, x->state()); 2186 2187 #ifndef PRODUCT 2188 if (PrintC1Statistics) { 2189 increment_counter(Runtime1::throw_count_address(), T_INT); 2190 } 2191 #endif 2192 2193 // check if the instruction has an xhandler in any of the nested scopes 2194 bool unwind = false; 2195 if (info->exception_handlers()->length() == 0) { 2196 // this throw is not inside an xhandler 2197 unwind = true; 2198 } else { 2199 // get some idea of the throw type 2200 bool type_is_exact = true; 2201 ciType* throw_type = x->exception()->exact_type(); 2202 if (throw_type == NULL) { 2203 type_is_exact = false; 2204 throw_type = x->exception()->declared_type(); 2205 } 2206 if (throw_type != NULL && throw_type->is_instance_klass()) { 2207 ciInstanceKlass* throw_klass = (ciInstanceKlass*)throw_type; 2208 unwind = !x->exception_handlers()->could_catch(throw_klass, type_is_exact); 2209 } 2210 } 2211 2212 // do null check before moving exception oop into fixed register 2213 // to avoid a fixed interval with an oop during the null check. 2214 // Use a copy of the CodeEmitInfo because debug information is 2215 // different for null_check and throw. 2216 if (x->exception()->as_NewInstance() == NULL && x->exception()->as_ExceptionObject() == NULL) { 2217 // if the exception object wasn't created using new then it might be null. 2218 __ null_check(exception_opr, new CodeEmitInfo(info, x->state()->copy(ValueStack::ExceptionState, x->state()->bci()))); 2219 } 2220 2221 if (compilation()->env()->jvmti_can_post_on_exceptions()) { 2222 // we need to go through the exception lookup path to get JVMTI 2223 // notification done 2224 unwind = false; 2225 } 2226 2227 // move exception oop into fixed register 2228 __ move(exception_opr, exceptionOopOpr()); 2229 2230 if (unwind) { 2231 __ unwind_exception(exceptionOopOpr()); 2232 } else { 2233 __ throw_exception(exceptionPcOpr(), exceptionOopOpr(), info); 2234 } 2235 } 2236 2237 2238 void LIRGenerator::do_RoundFP(RoundFP* x) { 2239 LIRItem input(x->input(), this); 2240 input.load_item(); 2241 LIR_Opr input_opr = input.result(); 2242 assert(input_opr->is_register(), "why round if value is not in a register?"); 2243 assert(input_opr->is_single_fpu() || input_opr->is_double_fpu(), "input should be floating-point value"); 2244 if (input_opr->is_single_fpu()) { 2245 set_result(x, round_item(input_opr)); // This code path not currently taken 2246 } else { 2247 LIR_Opr result = new_register(T_DOUBLE); 2248 set_vreg_flag(result, must_start_in_memory); 2249 __ roundfp(input_opr, LIR_OprFact::illegalOpr, result); 2250 set_result(x, result); 2251 } 2252 } 2253 2254 // Here UnsafeGetRaw may have x->base() and x->index() be int or long 2255 // on both 64 and 32 bits. Expecting x->base() to be always long on 64bit. 2256 void LIRGenerator::do_UnsafeGetRaw(UnsafeGetRaw* x) { 2257 LIRItem base(x->base(), this); 2258 LIRItem idx(this); 2259 2260 base.load_item(); 2261 if (x->has_index()) { 2262 idx.set_instruction(x->index()); 2263 idx.load_nonconstant(); 2264 } 2265 2266 LIR_Opr reg = rlock_result(x, x->basic_type()); 2267 2268 int log2_scale = 0; 2269 if (x->has_index()) { 2270 log2_scale = x->log2_scale(); 2271 } 2272 2273 assert(!x->has_index() || idx.value() == x->index(), "should match"); 2274 2275 LIR_Opr base_op = base.result(); 2276 LIR_Opr index_op = idx.result(); 2277 #ifndef _LP64 2278 if (base_op->type() == T_LONG) { 2279 base_op = new_register(T_INT); 2280 __ convert(Bytecodes::_l2i, base.result(), base_op); 2281 } 2282 if (x->has_index()) { 2283 if (index_op->type() == T_LONG) { 2284 LIR_Opr long_index_op = index_op; 2285 if (index_op->is_constant()) { 2286 long_index_op = new_register(T_LONG); 2287 __ move(index_op, long_index_op); 2288 } 2289 index_op = new_register(T_INT); 2290 __ convert(Bytecodes::_l2i, long_index_op, index_op); 2291 } else { 2292 assert(x->index()->type()->tag() == intTag, "must be"); 2293 } 2294 } 2295 // At this point base and index should be all ints. 2296 assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); 2297 assert(!x->has_index() || index_op->type() == T_INT, "index should be an int"); 2298 #else 2299 if (x->has_index()) { 2300 if (index_op->type() == T_INT) { 2301 if (!index_op->is_constant()) { 2302 index_op = new_register(T_LONG); 2303 __ convert(Bytecodes::_i2l, idx.result(), index_op); 2304 } 2305 } else { 2306 assert(index_op->type() == T_LONG, "must be"); 2307 if (index_op->is_constant()) { 2308 index_op = new_register(T_LONG); 2309 __ move(idx.result(), index_op); 2310 } 2311 } 2312 } 2313 // At this point base is a long non-constant 2314 // Index is a long register or a int constant. 2315 // We allow the constant to stay an int because that would allow us a more compact encoding by 2316 // embedding an immediate offset in the address expression. If we have a long constant, we have to 2317 // move it into a register first. 2318 assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a long non-constant"); 2319 assert(!x->has_index() || (index_op->type() == T_INT && index_op->is_constant()) || 2320 (index_op->type() == T_LONG && !index_op->is_constant()), "unexpected index type"); 2321 #endif 2322 2323 BasicType dst_type = x->basic_type(); 2324 2325 LIR_Address* addr; 2326 if (index_op->is_constant()) { 2327 assert(log2_scale == 0, "must not have a scale"); 2328 assert(index_op->type() == T_INT, "only int constants supported"); 2329 addr = new LIR_Address(base_op, index_op->as_jint(), dst_type); 2330 } else { 2331 #ifdef X86 2332 addr = new LIR_Address(base_op, index_op, LIR_Address::Scale(log2_scale), 0, dst_type); 2333 #elif defined(GENERATE_ADDRESS_IS_PREFERRED) 2334 addr = generate_address(base_op, index_op, log2_scale, 0, dst_type); 2335 #else 2336 if (index_op->is_illegal() || log2_scale == 0) { 2337 addr = new LIR_Address(base_op, index_op, dst_type); 2338 } else { 2339 LIR_Opr tmp = new_pointer_register(); 2340 __ shift_left(index_op, log2_scale, tmp); 2341 addr = new LIR_Address(base_op, tmp, dst_type); 2342 } 2343 #endif 2344 } 2345 2346 if (x->may_be_unaligned() && (dst_type == T_LONG || dst_type == T_DOUBLE)) { 2347 __ unaligned_move(addr, reg); 2348 } else { 2349 if (dst_type == T_OBJECT && x->is_wide()) { 2350 __ move_wide(addr, reg); 2351 } else { 2352 __ move(addr, reg); 2353 } 2354 } 2355 } 2356 2357 2358 void LIRGenerator::do_UnsafePutRaw(UnsafePutRaw* x) { 2359 int log2_scale = 0; 2360 BasicType type = x->basic_type(); 2361 2362 if (x->has_index()) { 2363 log2_scale = x->log2_scale(); 2364 } 2365 2366 LIRItem base(x->base(), this); 2367 LIRItem value(x->value(), this); 2368 LIRItem idx(this); 2369 2370 base.load_item(); 2371 if (x->has_index()) { 2372 idx.set_instruction(x->index()); 2373 idx.load_item(); 2374 } 2375 2376 if (type == T_BYTE || type == T_BOOLEAN) { 2377 value.load_byte_item(); 2378 } else { 2379 value.load_item(); 2380 } 2381 2382 set_no_result(x); 2383 2384 LIR_Opr base_op = base.result(); 2385 LIR_Opr index_op = idx.result(); 2386 2387 #ifdef GENERATE_ADDRESS_IS_PREFERRED 2388 LIR_Address* addr = generate_address(base_op, index_op, log2_scale, 0, x->basic_type()); 2389 #else 2390 #ifndef _LP64 2391 if (base_op->type() == T_LONG) { 2392 base_op = new_register(T_INT); 2393 __ convert(Bytecodes::_l2i, base.result(), base_op); 2394 } 2395 if (x->has_index()) { 2396 if (index_op->type() == T_LONG) { 2397 index_op = new_register(T_INT); 2398 __ convert(Bytecodes::_l2i, idx.result(), index_op); 2399 } 2400 } 2401 // At this point base and index should be all ints and not constants 2402 assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); 2403 assert(!x->has_index() || (index_op->type() == T_INT && !index_op->is_constant()), "index should be an non-constant int"); 2404 #else 2405 if (x->has_index()) { 2406 if (index_op->type() == T_INT) { 2407 index_op = new_register(T_LONG); 2408 __ convert(Bytecodes::_i2l, idx.result(), index_op); 2409 } 2410 } 2411 // At this point base and index are long and non-constant 2412 assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a non-constant long"); 2413 assert(!x->has_index() || (index_op->type() == T_LONG && !index_op->is_constant()), "index must be a non-constant long"); 2414 #endif 2415 2416 if (log2_scale != 0) { 2417 // temporary fix (platform dependent code without shift on Intel would be better) 2418 // TODO: ARM also allows embedded shift in the address 2419 LIR_Opr tmp = new_pointer_register(); 2420 if (TwoOperandLIRForm) { 2421 __ move(index_op, tmp); 2422 index_op = tmp; 2423 } 2424 __ shift_left(index_op, log2_scale, tmp); 2425 if (!TwoOperandLIRForm) { 2426 index_op = tmp; 2427 } 2428 } 2429 2430 LIR_Address* addr = new LIR_Address(base_op, index_op, x->basic_type()); 2431 #endif // !GENERATE_ADDRESS_IS_PREFERRED 2432 __ move(value.result(), addr); 2433 } 2434 2435 2436 void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) { 2437 BasicType type = x->basic_type(); 2438 LIRItem src(x->object(), this); 2439 LIRItem off(x->offset(), this); 2440 2441 off.load_item(); 2442 src.load_item(); 2443 2444 DecoratorSet decorators = IN_HEAP | C1_UNSAFE_ACCESS; 2445 2446 if (x->is_volatile()) { 2447 decorators |= MO_SEQ_CST; 2448 } 2449 if (type == T_BOOLEAN) { 2450 decorators |= C1_MASK_BOOLEAN; 2451 } 2452 if (type == T_ARRAY || type == T_OBJECT) { 2453 decorators |= ON_UNKNOWN_OOP_REF; 2454 } 2455 2456 LIR_Opr result = rlock_result(x, type); 2457 access_load_at(decorators, type, 2458 src, off.result(), result); 2459 } 2460 2461 2462 void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) { 2463 BasicType type = x->basic_type(); 2464 LIRItem src(x->object(), this); 2465 LIRItem off(x->offset(), this); 2466 LIRItem data(x->value(), this); 2467 2468 src.load_item(); 2469 if (type == T_BOOLEAN || type == T_BYTE) { 2470 data.load_byte_item(); 2471 } else { 2472 data.load_item(); 2473 } 2474 off.load_item(); 2475 2476 set_no_result(x); 2477 2478 DecoratorSet decorators = IN_HEAP | C1_UNSAFE_ACCESS; 2479 if (type == T_ARRAY || type == T_OBJECT) { 2480 decorators |= ON_UNKNOWN_OOP_REF; 2481 } 2482 if (x->is_volatile()) { 2483 decorators |= MO_SEQ_CST; 2484 } 2485 access_store_at(decorators, type, src, off.result(), data.result()); 2486 } 2487 2488 void LIRGenerator::do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) { 2489 BasicType type = x->basic_type(); 2490 LIRItem src(x->object(), this); 2491 LIRItem off(x->offset(), this); 2492 LIRItem value(x->value(), this); 2493 2494 DecoratorSet decorators = IN_HEAP | C1_UNSAFE_ACCESS | MO_SEQ_CST; 2495 2496 if (type == T_ARRAY || type == T_OBJECT) { 2497 decorators |= ON_UNKNOWN_OOP_REF; 2498 } 2499 2500 LIR_Opr result; 2501 if (x->is_add()) { 2502 result = access_atomic_add_at(decorators, type, src, off, value); 2503 } else { 2504 result = access_atomic_xchg_at(decorators, type, src, off, value); 2505 } 2506 set_result(x, result); 2507 } 2508 2509 void LIRGenerator::do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux) { 2510 int lng = x->length(); 2511 2512 for (int i = 0; i < lng; i++) { 2513 SwitchRange* one_range = x->at(i); 2514 int low_key = one_range->low_key(); 2515 int high_key = one_range->high_key(); 2516 BlockBegin* dest = one_range->sux(); 2517 if (low_key == high_key) { 2518 __ cmp(lir_cond_equal, value, low_key); 2519 __ branch(lir_cond_equal, T_INT, dest); 2520 } else if (high_key - low_key == 1) { 2521 __ cmp(lir_cond_equal, value, low_key); 2522 __ branch(lir_cond_equal, T_INT, dest); 2523 __ cmp(lir_cond_equal, value, high_key); 2524 __ branch(lir_cond_equal, T_INT, dest); 2525 } else { 2526 LabelObj* L = new LabelObj(); 2527 __ cmp(lir_cond_less, value, low_key); 2528 __ branch(lir_cond_less, T_INT, L->label()); 2529 __ cmp(lir_cond_lessEqual, value, high_key); 2530 __ branch(lir_cond_lessEqual, T_INT, dest); 2531 __ branch_destination(L->label()); 2532 } 2533 } 2534 __ jump(default_sux); 2535 } 2536 2537 2538 SwitchRangeArray* LIRGenerator::create_lookup_ranges(TableSwitch* x) { 2539 SwitchRangeList* res = new SwitchRangeList(); 2540 int len = x->length(); 2541 if (len > 0) { 2542 BlockBegin* sux = x->sux_at(0); 2543 int key = x->lo_key(); 2544 BlockBegin* default_sux = x->default_sux(); 2545 SwitchRange* range = new SwitchRange(key, sux); 2546 for (int i = 0; i < len; i++, key++) { 2547 BlockBegin* new_sux = x->sux_at(i); 2548 if (sux == new_sux) { 2549 // still in same range 2550 range->set_high_key(key); 2551 } else { 2552 // skip tests which explicitly dispatch to the default 2553 if (sux != default_sux) { 2554 res->append(range); 2555 } 2556 range = new SwitchRange(key, new_sux); 2557 } 2558 sux = new_sux; 2559 } 2560 if (res->length() == 0 || res->last() != range) res->append(range); 2561 } 2562 return res; 2563 } 2564 2565 2566 // we expect the keys to be sorted by increasing value 2567 SwitchRangeArray* LIRGenerator::create_lookup_ranges(LookupSwitch* x) { 2568 SwitchRangeList* res = new SwitchRangeList(); 2569 int len = x->length(); 2570 if (len > 0) { 2571 BlockBegin* default_sux = x->default_sux(); 2572 int key = x->key_at(0); 2573 BlockBegin* sux = x->sux_at(0); 2574 SwitchRange* range = new SwitchRange(key, sux); 2575 for (int i = 1; i < len; i++) { 2576 int new_key = x->key_at(i); 2577 BlockBegin* new_sux = x->sux_at(i); 2578 if (key+1 == new_key && sux == new_sux) { 2579 // still in same range 2580 range->set_high_key(new_key); 2581 } else { 2582 // skip tests which explicitly dispatch to the default 2583 if (range->sux() != default_sux) { 2584 res->append(range); 2585 } 2586 range = new SwitchRange(new_key, new_sux); 2587 } 2588 key = new_key; 2589 sux = new_sux; 2590 } 2591 if (res->length() == 0 || res->last() != range) res->append(range); 2592 } 2593 return res; 2594 } 2595 2596 2597 void LIRGenerator::do_TableSwitch(TableSwitch* x) { 2598 LIRItem tag(x->tag(), this); 2599 tag.load_item(); 2600 set_no_result(x); 2601 2602 if (x->is_safepoint()) { 2603 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2604 } 2605 2606 // move values into phi locations 2607 move_to_phi(x->state()); 2608 2609 int lo_key = x->lo_key(); 2610 int len = x->length(); 2611 assert(lo_key <= (lo_key + (len - 1)), "integer overflow"); 2612 LIR_Opr value = tag.result(); 2613 2614 if (compilation()->env()->comp_level() == CompLevel_full_profile && UseSwitchProfiling) { 2615 ciMethod* method = x->state()->scope()->method(); 2616 ciMethodData* md = method->method_data_or_null(); 2617 assert(md != NULL, "Sanity"); 2618 ciProfileData* data = md->bci_to_data(x->state()->bci()); 2619 assert(data != NULL, "must have profiling data"); 2620 assert(data->is_MultiBranchData(), "bad profile data?"); 2621 int default_count_offset = md->byte_offset_of_slot(data, MultiBranchData::default_count_offset()); 2622 LIR_Opr md_reg = new_register(T_METADATA); 2623 __ metadata2reg(md->constant_encoding(), md_reg); 2624 LIR_Opr data_offset_reg = new_pointer_register(); 2625 LIR_Opr tmp_reg = new_pointer_register(); 2626 2627 __ move(LIR_OprFact::intptrConst(default_count_offset), data_offset_reg); 2628 for (int i = 0; i < len; i++) { 2629 int count_offset = md->byte_offset_of_slot(data, MultiBranchData::case_count_offset(i)); 2630 __ cmp(lir_cond_equal, value, i + lo_key); 2631 __ move(data_offset_reg, tmp_reg); 2632 __ cmove(lir_cond_equal, 2633 LIR_OprFact::intptrConst(count_offset), 2634 tmp_reg, 2635 data_offset_reg, T_INT); 2636 } 2637 2638 LIR_Opr data_reg = new_pointer_register(); 2639 LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type()); 2640 __ move(data_addr, data_reg); 2641 __ add(data_reg, LIR_OprFact::intptrConst(1), data_reg); 2642 __ move(data_reg, data_addr); 2643 } 2644 2645 if (UseTableRanges) { 2646 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2647 } else { 2648 for (int i = 0; i < len; i++) { 2649 __ cmp(lir_cond_equal, value, i + lo_key); 2650 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2651 } 2652 __ jump(x->default_sux()); 2653 } 2654 } 2655 2656 2657 void LIRGenerator::do_LookupSwitch(LookupSwitch* x) { 2658 LIRItem tag(x->tag(), this); 2659 tag.load_item(); 2660 set_no_result(x); 2661 2662 if (x->is_safepoint()) { 2663 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2664 } 2665 2666 // move values into phi locations 2667 move_to_phi(x->state()); 2668 2669 LIR_Opr value = tag.result(); 2670 int len = x->length(); 2671 2672 if (compilation()->env()->comp_level() == CompLevel_full_profile && UseSwitchProfiling) { 2673 ciMethod* method = x->state()->scope()->method(); 2674 ciMethodData* md = method->method_data_or_null(); 2675 assert(md != NULL, "Sanity"); 2676 ciProfileData* data = md->bci_to_data(x->state()->bci()); 2677 assert(data != NULL, "must have profiling data"); 2678 assert(data->is_MultiBranchData(), "bad profile data?"); 2679 int default_count_offset = md->byte_offset_of_slot(data, MultiBranchData::default_count_offset()); 2680 LIR_Opr md_reg = new_register(T_METADATA); 2681 __ metadata2reg(md->constant_encoding(), md_reg); 2682 LIR_Opr data_offset_reg = new_pointer_register(); 2683 LIR_Opr tmp_reg = new_pointer_register(); 2684 2685 __ move(LIR_OprFact::intptrConst(default_count_offset), data_offset_reg); 2686 for (int i = 0; i < len; i++) { 2687 int count_offset = md->byte_offset_of_slot(data, MultiBranchData::case_count_offset(i)); 2688 __ cmp(lir_cond_equal, value, x->key_at(i)); 2689 __ move(data_offset_reg, tmp_reg); 2690 __ cmove(lir_cond_equal, 2691 LIR_OprFact::intptrConst(count_offset), 2692 tmp_reg, 2693 data_offset_reg, T_INT); 2694 } 2695 2696 LIR_Opr data_reg = new_pointer_register(); 2697 LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type()); 2698 __ move(data_addr, data_reg); 2699 __ add(data_reg, LIR_OprFact::intptrConst(1), data_reg); 2700 __ move(data_reg, data_addr); 2701 } 2702 2703 if (UseTableRanges) { 2704 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2705 } else { 2706 int len = x->length(); 2707 for (int i = 0; i < len; i++) { 2708 __ cmp(lir_cond_equal, value, x->key_at(i)); 2709 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2710 } 2711 __ jump(x->default_sux()); 2712 } 2713 } 2714 2715 2716 void LIRGenerator::do_Goto(Goto* x) { 2717 set_no_result(x); 2718 2719 if (block()->next()->as_OsrEntry()) { 2720 // need to free up storage used for OSR entry point 2721 LIR_Opr osrBuffer = block()->next()->operand(); 2722 BasicTypeList signature; 2723 signature.append(NOT_LP64(T_INT) LP64_ONLY(T_LONG)); // pass a pointer to osrBuffer 2724 CallingConvention* cc = frame_map()->c_calling_convention(&signature); 2725 __ move(osrBuffer, cc->args()->at(0)); 2726 __ call_runtime_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), 2727 getThreadTemp(), LIR_OprFact::illegalOpr, cc->args()); 2728 } 2729 2730 if (x->is_safepoint()) { 2731 ValueStack* state = x->state_before() ? x->state_before() : x->state(); 2732 2733 // increment backedge counter if needed 2734 CodeEmitInfo* info = state_for(x, state); 2735 increment_backedge_counter(info, x->profiled_bci()); 2736 CodeEmitInfo* safepoint_info = state_for(x, state); 2737 __ safepoint(safepoint_poll_register(), safepoint_info); 2738 } 2739 2740 // Gotos can be folded Ifs, handle this case. 2741 if (x->should_profile()) { 2742 ciMethod* method = x->profiled_method(); 2743 assert(method != NULL, "method should be set if branch is profiled"); 2744 ciMethodData* md = method->method_data_or_null(); 2745 assert(md != NULL, "Sanity"); 2746 ciProfileData* data = md->bci_to_data(x->profiled_bci()); 2747 assert(data != NULL, "must have profiling data"); 2748 int offset; 2749 if (x->direction() == Goto::taken) { 2750 assert(data->is_BranchData(), "need BranchData for two-way branches"); 2751 offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); 2752 } else if (x->direction() == Goto::not_taken) { 2753 assert(data->is_BranchData(), "need BranchData for two-way branches"); 2754 offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); 2755 } else { 2756 assert(data->is_JumpData(), "need JumpData for branches"); 2757 offset = md->byte_offset_of_slot(data, JumpData::taken_offset()); 2758 } 2759 LIR_Opr md_reg = new_register(T_METADATA); 2760 __ metadata2reg(md->constant_encoding(), md_reg); 2761 2762 increment_counter(new LIR_Address(md_reg, offset, 2763 NOT_LP64(T_INT) LP64_ONLY(T_LONG)), DataLayout::counter_increment); 2764 } 2765 2766 // emit phi-instruction move after safepoint since this simplifies 2767 // describing the state as the safepoint. 2768 move_to_phi(x->state()); 2769 2770 __ jump(x->default_sux()); 2771 } 2772 2773 /** 2774 * Emit profiling code if needed for arguments, parameters, return value types 2775 * 2776 * @param md MDO the code will update at runtime 2777 * @param md_base_offset common offset in the MDO for this profile and subsequent ones 2778 * @param md_offset offset in the MDO (on top of md_base_offset) for this profile 2779 * @param profiled_k current profile 2780 * @param obj IR node for the object to be profiled 2781 * @param mdp register to hold the pointer inside the MDO (md + md_base_offset). 2782 * Set once we find an update to make and use for next ones. 2783 * @param not_null true if we know obj cannot be null 2784 * @param signature_at_call_k signature at call for obj 2785 * @param callee_signature_k signature of callee for obj 2786 * at call and callee signatures differ at method handle call 2787 * @return the only klass we know will ever be seen at this profile point 2788 */ 2789 ciKlass* LIRGenerator::profile_type(ciMethodData* md, int md_base_offset, int md_offset, intptr_t profiled_k, 2790 Value obj, LIR_Opr& mdp, bool not_null, ciKlass* signature_at_call_k, 2791 ciKlass* callee_signature_k) { 2792 ciKlass* result = NULL; 2793 bool do_null = !not_null && !TypeEntries::was_null_seen(profiled_k); 2794 bool do_update = !TypeEntries::is_type_unknown(profiled_k); 2795 // known not to be null or null bit already set and already set to 2796 // unknown: nothing we can do to improve profiling 2797 if (!do_null && !do_update) { 2798 return result; 2799 } 2800 2801 ciKlass* exact_klass = NULL; 2802 Compilation* comp = Compilation::current(); 2803 if (do_update) { 2804 // try to find exact type, using CHA if possible, so that loading 2805 // the klass from the object can be avoided 2806 ciType* type = obj->exact_type(); 2807 if (type == NULL) { 2808 type = obj->declared_type(); 2809 type = comp->cha_exact_type(type); 2810 } 2811 assert(type == NULL || type->is_klass(), "type should be class"); 2812 exact_klass = (type != NULL && type->is_loaded()) ? (ciKlass*)type : NULL; 2813 2814 do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; 2815 } 2816 2817 if (!do_null && !do_update) { 2818 return result; 2819 } 2820 2821 ciKlass* exact_signature_k = NULL; 2822 if (do_update) { 2823 // Is the type from the signature exact (the only one possible)? 2824 exact_signature_k = signature_at_call_k->exact_klass(); 2825 if (exact_signature_k == NULL) { 2826 exact_signature_k = comp->cha_exact_type(signature_at_call_k); 2827 } else { 2828 result = exact_signature_k; 2829 // Known statically. No need to emit any code: prevent 2830 // LIR_Assembler::emit_profile_type() from emitting useless code 2831 profiled_k = ciTypeEntries::with_status(result, profiled_k); 2832 } 2833 // exact_klass and exact_signature_k can be both non NULL but 2834 // different if exact_klass is loaded after the ciObject for 2835 // exact_signature_k is created. 2836 if (exact_klass == NULL && exact_signature_k != NULL && exact_klass != exact_signature_k) { 2837 // sometimes the type of the signature is better than the best type 2838 // the compiler has 2839 exact_klass = exact_signature_k; 2840 } 2841 if (callee_signature_k != NULL && 2842 callee_signature_k != signature_at_call_k) { 2843 ciKlass* improved_klass = callee_signature_k->exact_klass(); 2844 if (improved_klass == NULL) { 2845 improved_klass = comp->cha_exact_type(callee_signature_k); 2846 } 2847 if (exact_klass == NULL && improved_klass != NULL && exact_klass != improved_klass) { 2848 exact_klass = exact_signature_k; 2849 } 2850 } 2851 do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; 2852 } 2853 2854 if (!do_null && !do_update) { 2855 return result; 2856 } 2857 2858 if (mdp == LIR_OprFact::illegalOpr) { 2859 mdp = new_register(T_METADATA); 2860 __ metadata2reg(md->constant_encoding(), mdp); 2861 if (md_base_offset != 0) { 2862 LIR_Address* base_type_address = new LIR_Address(mdp, md_base_offset, T_ADDRESS); 2863 mdp = new_pointer_register(); 2864 __ leal(LIR_OprFact::address(base_type_address), mdp); 2865 } 2866 } 2867 LIRItem value(obj, this); 2868 value.load_item(); 2869 __ profile_type(new LIR_Address(mdp, md_offset, T_METADATA), 2870 value.result(), exact_klass, profiled_k, new_pointer_register(), not_null, exact_signature_k != NULL); 2871 return result; 2872 } 2873 2874 // profile parameters on entry to the root of the compilation 2875 void LIRGenerator::profile_parameters(Base* x) { 2876 if (compilation()->profile_parameters()) { 2877 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2878 ciMethodData* md = scope()->method()->method_data_or_null(); 2879 assert(md != NULL, "Sanity"); 2880 2881 if (md->parameters_type_data() != NULL) { 2882 ciParametersTypeData* parameters_type_data = md->parameters_type_data(); 2883 ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); 2884 LIR_Opr mdp = LIR_OprFact::illegalOpr; 2885 for (int java_index = 0, i = 0, j = 0; j < parameters_type_data->number_of_parameters(); i++) { 2886 LIR_Opr src = args->at(i); 2887 assert(!src->is_illegal(), "check"); 2888 BasicType t = src->type(); 2889 if (t == T_OBJECT || t == T_ARRAY) { 2890 intptr_t profiled_k = parameters->type(j); 2891 Local* local = x->state()->local_at(java_index)->as_Local(); 2892 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), 2893 in_bytes(ParametersTypeData::type_offset(j)) - in_bytes(ParametersTypeData::type_offset(0)), 2894 profiled_k, local, mdp, false, local->declared_type()->as_klass(), NULL); 2895 // If the profile is known statically set it once for all and do not emit any code 2896 if (exact != NULL) { 2897 md->set_parameter_type(j, exact); 2898 } 2899 j++; 2900 } 2901 java_index += type2size[t]; 2902 } 2903 } 2904 } 2905 } 2906 2907 void LIRGenerator::do_Base(Base* x) { 2908 __ std_entry(LIR_OprFact::illegalOpr); 2909 // Emit moves from physical registers / stack slots to virtual registers 2910 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2911 IRScope* irScope = compilation()->hir()->top_scope(); 2912 int java_index = 0; 2913 for (int i = 0; i < args->length(); i++) { 2914 LIR_Opr src = args->at(i); 2915 assert(!src->is_illegal(), "check"); 2916 BasicType t = src->type(); 2917 2918 // Types which are smaller than int are passed as int, so 2919 // correct the type which passed. 2920 switch (t) { 2921 case T_BYTE: 2922 case T_BOOLEAN: 2923 case T_SHORT: 2924 case T_CHAR: 2925 t = T_INT; 2926 break; 2927 default: 2928 break; 2929 } 2930 2931 LIR_Opr dest = new_register(t); 2932 __ move(src, dest); 2933 2934 // Assign new location to Local instruction for this local 2935 Local* local = x->state()->local_at(java_index)->as_Local(); 2936 assert(local != NULL, "Locals for incoming arguments must have been created"); 2937 #ifndef __SOFTFP__ 2938 // The java calling convention passes double as long and float as int. 2939 assert(as_ValueType(t)->tag() == local->type()->tag(), "check"); 2940 #endif // __SOFTFP__ 2941 local->set_operand(dest); 2942 _instruction_for_operand.at_put_grow(dest->vreg_number(), local, NULL); 2943 java_index += type2size[t]; 2944 } 2945 2946 if (compilation()->env()->dtrace_method_probes()) { 2947 BasicTypeList signature; 2948 signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 2949 signature.append(T_METADATA); // Method* 2950 LIR_OprList* args = new LIR_OprList(); 2951 args->append(getThreadPointer()); 2952 LIR_Opr meth = new_register(T_METADATA); 2953 __ metadata2reg(method()->constant_encoding(), meth); 2954 args->append(meth); 2955 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), voidType, NULL); 2956 } 2957 2958 if (method()->is_synchronized()) { 2959 LIR_Opr obj; 2960 if (method()->is_static()) { 2961 obj = new_register(T_OBJECT); 2962 __ oop2reg(method()->holder()->java_mirror()->constant_encoding(), obj); 2963 } else { 2964 Local* receiver = x->state()->local_at(0)->as_Local(); 2965 assert(receiver != NULL, "must already exist"); 2966 obj = receiver->operand(); 2967 } 2968 assert(obj->is_valid(), "must be valid"); 2969 2970 if (method()->is_synchronized() && GenerateSynchronizationCode) { 2971 LIR_Opr lock = syncLockOpr(); 2972 __ load_stack_address_monitor(0, lock); 2973 2974 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, x->check_flag(Instruction::DeoptimizeOnException)); 2975 CodeStub* slow_path = new MonitorEnterStub(obj, lock, info); 2976 2977 // receiver is guaranteed non-NULL so don't need CodeEmitInfo 2978 __ lock_object(syncTempOpr(), obj, lock, new_register(T_OBJECT), slow_path, NULL); 2979 } 2980 } 2981 if (compilation()->age_code()) { 2982 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, 0), NULL, false); 2983 decrement_age(info); 2984 } 2985 // increment invocation counters if needed 2986 if (!method()->is_accessor()) { // Accessors do not have MDOs, so no counting. 2987 profile_parameters(x); 2988 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, false); 2989 increment_invocation_counter(info); 2990 } 2991 2992 // all blocks with a successor must end with an unconditional jump 2993 // to the successor even if they are consecutive 2994 __ jump(x->default_sux()); 2995 } 2996 2997 2998 void LIRGenerator::do_OsrEntry(OsrEntry* x) { 2999 // construct our frame and model the production of incoming pointer 3000 // to the OSR buffer. 3001 __ osr_entry(LIR_Assembler::osrBufferPointer()); 3002 LIR_Opr result = rlock_result(x); 3003 __ move(LIR_Assembler::osrBufferPointer(), result); 3004 } 3005 3006 3007 void LIRGenerator::invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list) { 3008 assert(args->length() == arg_list->length(), 3009 "args=%d, arg_list=%d", args->length(), arg_list->length()); 3010 for (int i = x->has_receiver() ? 1 : 0; i < args->length(); i++) { 3011 LIRItem* param = args->at(i); 3012 LIR_Opr loc = arg_list->at(i); 3013 if (loc->is_register()) { 3014 param->load_item_force(loc); 3015 } else { 3016 LIR_Address* addr = loc->as_address_ptr(); 3017 param->load_for_store(addr->type()); 3018 assert(addr->type() != T_VALUETYPE, "not supported yet"); 3019 if (addr->type() == T_OBJECT) { 3020 __ move_wide(param->result(), addr); 3021 } else 3022 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3023 __ unaligned_move(param->result(), addr); 3024 } else { 3025 __ move(param->result(), addr); 3026 } 3027 } 3028 } 3029 3030 if (x->has_receiver()) { 3031 LIRItem* receiver = args->at(0); 3032 LIR_Opr loc = arg_list->at(0); 3033 if (loc->is_register()) { 3034 receiver->load_item_force(loc); 3035 } else { 3036 assert(loc->is_address(), "just checking"); 3037 receiver->load_for_store(T_OBJECT); 3038 __ move_wide(receiver->result(), loc->as_address_ptr()); 3039 } 3040 } 3041 } 3042 3043 3044 // Visits all arguments, returns appropriate items without loading them 3045 LIRItemList* LIRGenerator::invoke_visit_arguments(Invoke* x) { 3046 LIRItemList* argument_items = new LIRItemList(); 3047 if (x->has_receiver()) { 3048 LIRItem* receiver = new LIRItem(x->receiver(), this); 3049 argument_items->append(receiver); 3050 } 3051 for (int i = 0; i < x->number_of_arguments(); i++) { 3052 LIRItem* param = new LIRItem(x->argument_at(i), this); 3053 argument_items->append(param); 3054 } 3055 return argument_items; 3056 } 3057 3058 3059 // The invoke with receiver has following phases: 3060 // a) traverse and load/lock receiver; 3061 // b) traverse all arguments -> item-array (invoke_visit_argument) 3062 // c) push receiver on stack 3063 // d) load each of the items and push on stack 3064 // e) unlock receiver 3065 // f) move receiver into receiver-register %o0 3066 // g) lock result registers and emit call operation 3067 // 3068 // Before issuing a call, we must spill-save all values on stack 3069 // that are in caller-save register. "spill-save" moves those registers 3070 // either in a free callee-save register or spills them if no free 3071 // callee save register is available. 3072 // 3073 // The problem is where to invoke spill-save. 3074 // - if invoked between e) and f), we may lock callee save 3075 // register in "spill-save" that destroys the receiver register 3076 // before f) is executed 3077 // - if we rearrange f) to be earlier (by loading %o0) it 3078 // may destroy a value on the stack that is currently in %o0 3079 // and is waiting to be spilled 3080 // - if we keep the receiver locked while doing spill-save, 3081 // we cannot spill it as it is spill-locked 3082 // 3083 void LIRGenerator::do_Invoke(Invoke* x) { 3084 CallingConvention* cc = frame_map()->java_calling_convention(x->signature(), true); 3085 3086 LIR_OprList* arg_list = cc->args(); 3087 LIRItemList* args = invoke_visit_arguments(x); 3088 LIR_Opr receiver = LIR_OprFact::illegalOpr; 3089 3090 // setup result register 3091 LIR_Opr result_register = LIR_OprFact::illegalOpr; 3092 if (x->type() != voidType) { 3093 result_register = result_register_for(x->type()); 3094 } 3095 3096 CodeEmitInfo* info = state_for(x, x->state()); 3097 3098 invoke_load_arguments(x, args, arg_list); 3099 3100 if (x->has_receiver()) { 3101 args->at(0)->load_item_force(LIR_Assembler::receiverOpr()); 3102 receiver = args->at(0)->result(); 3103 } 3104 3105 // emit invoke code 3106 assert(receiver->is_illegal() || receiver->is_equal(LIR_Assembler::receiverOpr()), "must match"); 3107 3108 // JSR 292 3109 // Preserve the SP over MethodHandle call sites, if needed. 3110 ciMethod* target = x->target(); 3111 bool is_method_handle_invoke = (// %%% FIXME: Are both of these relevant? 3112 target->is_method_handle_intrinsic() || 3113 target->is_compiled_lambda_form()); 3114 if (is_method_handle_invoke) { 3115 info->set_is_method_handle_invoke(true); 3116 if(FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) { 3117 __ move(FrameMap::stack_pointer(), FrameMap::method_handle_invoke_SP_save_opr()); 3118 } 3119 } 3120 3121 switch (x->code()) { 3122 case Bytecodes::_invokestatic: 3123 __ call_static(target, result_register, 3124 SharedRuntime::get_resolve_static_call_stub(), 3125 arg_list, info); 3126 break; 3127 case Bytecodes::_invokespecial: 3128 case Bytecodes::_invokevirtual: 3129 case Bytecodes::_invokeinterface: 3130 // for loaded and final (method or class) target we still produce an inline cache, 3131 // in order to be able to call mixed mode 3132 if (x->code() == Bytecodes::_invokespecial || x->target_is_final()) { 3133 __ call_opt_virtual(target, receiver, result_register, 3134 SharedRuntime::get_resolve_opt_virtual_call_stub(), 3135 arg_list, info); 3136 } else if (x->vtable_index() < 0) { 3137 __ call_icvirtual(target, receiver, result_register, 3138 SharedRuntime::get_resolve_virtual_call_stub(), 3139 arg_list, info); 3140 } else { 3141 int entry_offset = in_bytes(Klass::vtable_start_offset()) + x->vtable_index() * vtableEntry::size_in_bytes(); 3142 int vtable_offset = entry_offset + vtableEntry::method_offset_in_bytes(); 3143 __ call_virtual(target, receiver, result_register, vtable_offset, arg_list, info); 3144 } 3145 break; 3146 case Bytecodes::_invokedynamic: { 3147 __ call_dynamic(target, receiver, result_register, 3148 SharedRuntime::get_resolve_static_call_stub(), 3149 arg_list, info); 3150 break; 3151 } 3152 default: 3153 fatal("unexpected bytecode: %s", Bytecodes::name(x->code())); 3154 break; 3155 } 3156 3157 // JSR 292 3158 // Restore the SP after MethodHandle call sites, if needed. 3159 if (is_method_handle_invoke 3160 && FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) { 3161 __ move(FrameMap::method_handle_invoke_SP_save_opr(), FrameMap::stack_pointer()); 3162 } 3163 3164 if (x->type()->is_float() || x->type()->is_double()) { 3165 // Force rounding of results from non-strictfp when in strictfp 3166 // scope (or when we don't know the strictness of the callee, to 3167 // be safe.) 3168 if (method()->is_strict()) { 3169 if (!x->target_is_loaded() || !x->target_is_strictfp()) { 3170 result_register = round_item(result_register); 3171 } 3172 } 3173 } 3174 3175 if (result_register->is_valid()) { 3176 LIR_Opr result = rlock_result(x); 3177 __ move(result_register, result); 3178 } 3179 } 3180 3181 3182 void LIRGenerator::do_FPIntrinsics(Intrinsic* x) { 3183 assert(x->number_of_arguments() == 1, "wrong type"); 3184 LIRItem value (x->argument_at(0), this); 3185 LIR_Opr reg = rlock_result(x); 3186 value.load_item(); 3187 LIR_Opr tmp = force_to_spill(value.result(), as_BasicType(x->type())); 3188 __ move(tmp, reg); 3189 } 3190 3191 3192 3193 // Code for : x->x() {x->cond()} x->y() ? x->tval() : x->fval() 3194 void LIRGenerator::do_IfOp(IfOp* x) { 3195 #ifdef ASSERT 3196 { 3197 ValueTag xtag = x->x()->type()->tag(); 3198 ValueTag ttag = x->tval()->type()->tag(); 3199 assert(xtag == intTag || xtag == objectTag, "cannot handle others"); 3200 assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others"); 3201 assert(ttag == x->fval()->type()->tag(), "cannot handle others"); 3202 } 3203 #endif 3204 3205 LIRItem left(x->x(), this); 3206 LIRItem right(x->y(), this); 3207 left.load_item(); 3208 if (can_inline_as_constant(right.value())) { 3209 right.dont_load_item(); 3210 } else { 3211 right.load_item(); 3212 } 3213 3214 LIRItem t_val(x->tval(), this); 3215 LIRItem f_val(x->fval(), this); 3216 t_val.dont_load_item(); 3217 f_val.dont_load_item(); 3218 LIR_Opr reg = rlock_result(x); 3219 3220 __ cmp(lir_cond(x->cond()), left.result(), right.result()); 3221 __ cmove(lir_cond(x->cond()), t_val.result(), f_val.result(), reg, as_BasicType(x->x()->type())); 3222 } 3223 3224 #ifdef JFR_HAVE_INTRINSICS 3225 void LIRGenerator::do_ClassIDIntrinsic(Intrinsic* x) { 3226 CodeEmitInfo* info = state_for(x); 3227 CodeEmitInfo* info2 = new CodeEmitInfo(info); // Clone for the second null check 3228 3229 assert(info != NULL, "must have info"); 3230 LIRItem arg(x->argument_at(0), this); 3231 3232 arg.load_item(); 3233 LIR_Opr klass = new_register(T_METADATA); 3234 __ move(new LIR_Address(arg.result(), java_lang_Class::klass_offset_in_bytes(), T_ADDRESS), klass, info); 3235 LIR_Opr id = new_register(T_LONG); 3236 ByteSize offset = KLASS_TRACE_ID_OFFSET; 3237 LIR_Address* trace_id_addr = new LIR_Address(klass, in_bytes(offset), T_LONG); 3238 3239 __ move(trace_id_addr, id); 3240 __ logical_or(id, LIR_OprFact::longConst(0x01l), id); 3241 __ store(id, trace_id_addr); 3242 3243 #ifdef TRACE_ID_META_BITS 3244 __ logical_and(id, LIR_OprFact::longConst(~TRACE_ID_META_BITS), id); 3245 #endif 3246 #ifdef TRACE_ID_SHIFT 3247 __ unsigned_shift_right(id, TRACE_ID_SHIFT, id); 3248 #endif 3249 3250 __ move(id, rlock_result(x)); 3251 } 3252 3253 void LIRGenerator::do_getEventWriter(Intrinsic* x) { 3254 LabelObj* L_end = new LabelObj(); 3255 3256 LIR_Address* jobj_addr = new LIR_Address(getThreadPointer(), 3257 in_bytes(THREAD_LOCAL_WRITER_OFFSET_JFR), 3258 T_OBJECT); 3259 LIR_Opr result = rlock_result(x); 3260 __ move_wide(jobj_addr, result); 3261 __ cmp(lir_cond_equal, result, LIR_OprFact::oopConst(NULL)); 3262 __ branch(lir_cond_equal, T_OBJECT, L_end->label()); 3263 3264 LIR_Opr jobj = new_register(T_OBJECT); 3265 __ move(result, jobj); 3266 access_load(IN_NATIVE, T_OBJECT, LIR_OprFact::address(new LIR_Address(jobj, T_OBJECT)), result); 3267 3268 __ branch_destination(L_end->label()); 3269 } 3270 3271 #endif 3272 3273 3274 void LIRGenerator::do_RuntimeCall(address routine, Intrinsic* x) { 3275 assert(x->number_of_arguments() == 0, "wrong type"); 3276 // Enforce computation of _reserved_argument_area_size which is required on some platforms. 3277 BasicTypeList signature; 3278 CallingConvention* cc = frame_map()->c_calling_convention(&signature); 3279 LIR_Opr reg = result_register_for(x->type()); 3280 __ call_runtime_leaf(routine, getThreadTemp(), 3281 reg, new LIR_OprList()); 3282 LIR_Opr result = rlock_result(x); 3283 __ move(reg, result); 3284 } 3285 3286 3287 3288 void LIRGenerator::do_Intrinsic(Intrinsic* x) { 3289 switch (x->id()) { 3290 case vmIntrinsics::_intBitsToFloat : 3291 case vmIntrinsics::_doubleToRawLongBits : 3292 case vmIntrinsics::_longBitsToDouble : 3293 case vmIntrinsics::_floatToRawIntBits : { 3294 do_FPIntrinsics(x); 3295 break; 3296 } 3297 3298 #ifdef JFR_HAVE_INTRINSICS 3299 case vmIntrinsics::_getClassId: 3300 do_ClassIDIntrinsic(x); 3301 break; 3302 case vmIntrinsics::_getEventWriter: 3303 do_getEventWriter(x); 3304 break; 3305 case vmIntrinsics::_counterTime: 3306 do_RuntimeCall(CAST_FROM_FN_PTR(address, JFR_TIME_FUNCTION), x); 3307 break; 3308 #endif 3309 3310 case vmIntrinsics::_currentTimeMillis: 3311 do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeMillis), x); 3312 break; 3313 3314 case vmIntrinsics::_nanoTime: 3315 do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeNanos), x); 3316 break; 3317 3318 case vmIntrinsics::_Object_init: do_RegisterFinalizer(x); break; 3319 case vmIntrinsics::_isInstance: do_isInstance(x); break; 3320 case vmIntrinsics::_isPrimitive: do_isPrimitive(x); break; 3321 case vmIntrinsics::_getClass: do_getClass(x); break; 3322 case vmIntrinsics::_currentThread: do_currentThread(x); break; 3323 3324 case vmIntrinsics::_dlog: // fall through 3325 case vmIntrinsics::_dlog10: // fall through 3326 case vmIntrinsics::_dabs: // fall through 3327 case vmIntrinsics::_dsqrt: // fall through 3328 case vmIntrinsics::_dtan: // fall through 3329 case vmIntrinsics::_dsin : // fall through 3330 case vmIntrinsics::_dcos : // fall through 3331 case vmIntrinsics::_dexp : // fall through 3332 case vmIntrinsics::_dpow : do_MathIntrinsic(x); break; 3333 case vmIntrinsics::_arraycopy: do_ArrayCopy(x); break; 3334 3335 case vmIntrinsics::_fmaD: do_FmaIntrinsic(x); break; 3336 case vmIntrinsics::_fmaF: do_FmaIntrinsic(x); break; 3337 3338 // java.nio.Buffer.checkIndex 3339 case vmIntrinsics::_checkIndex: do_NIOCheckIndex(x); break; 3340 3341 case vmIntrinsics::_compareAndSetReference: 3342 do_CompareAndSwap(x, objectType); 3343 break; 3344 case vmIntrinsics::_compareAndSetInt: 3345 do_CompareAndSwap(x, intType); 3346 break; 3347 case vmIntrinsics::_compareAndSetLong: 3348 do_CompareAndSwap(x, longType); 3349 break; 3350 3351 case vmIntrinsics::_loadFence : 3352 __ membar_acquire(); 3353 break; 3354 case vmIntrinsics::_storeFence: 3355 __ membar_release(); 3356 break; 3357 case vmIntrinsics::_fullFence : 3358 __ membar(); 3359 break; 3360 case vmIntrinsics::_onSpinWait: 3361 __ on_spin_wait(); 3362 break; 3363 case vmIntrinsics::_Reference_get: 3364 do_Reference_get(x); 3365 break; 3366 3367 case vmIntrinsics::_updateCRC32: 3368 case vmIntrinsics::_updateBytesCRC32: 3369 case vmIntrinsics::_updateByteBufferCRC32: 3370 do_update_CRC32(x); 3371 break; 3372 3373 case vmIntrinsics::_updateBytesCRC32C: 3374 case vmIntrinsics::_updateDirectByteBufferCRC32C: 3375 do_update_CRC32C(x); 3376 break; 3377 3378 case vmIntrinsics::_vectorizedMismatch: 3379 do_vectorizedMismatch(x); 3380 break; 3381 3382 default: ShouldNotReachHere(); break; 3383 } 3384 } 3385 3386 void LIRGenerator::profile_arguments(ProfileCall* x) { 3387 if (compilation()->profile_arguments()) { 3388 int bci = x->bci_of_invoke(); 3389 ciMethodData* md = x->method()->method_data_or_null(); 3390 assert(md != NULL, "Sanity"); 3391 ciProfileData* data = md->bci_to_data(bci); 3392 if (data != NULL) { 3393 if ((data->is_CallTypeData() && data->as_CallTypeData()->has_arguments()) || 3394 (data->is_VirtualCallTypeData() && data->as_VirtualCallTypeData()->has_arguments())) { 3395 ByteSize extra = data->is_CallTypeData() ? CallTypeData::args_data_offset() : VirtualCallTypeData::args_data_offset(); 3396 int base_offset = md->byte_offset_of_slot(data, extra); 3397 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3398 ciTypeStackSlotEntries* args = data->is_CallTypeData() ? ((ciCallTypeData*)data)->args() : ((ciVirtualCallTypeData*)data)->args(); 3399 3400 Bytecodes::Code bc = x->method()->java_code_at_bci(bci); 3401 int start = 0; 3402 int stop = data->is_CallTypeData() ? ((ciCallTypeData*)data)->number_of_arguments() : ((ciVirtualCallTypeData*)data)->number_of_arguments(); 3403 if (x->callee()->is_loaded() && x->callee()->is_static() && Bytecodes::has_receiver(bc)) { 3404 // first argument is not profiled at call (method handle invoke) 3405 assert(x->method()->raw_code_at_bci(bci) == Bytecodes::_invokehandle, "invokehandle expected"); 3406 start = 1; 3407 } 3408 ciSignature* callee_signature = x->callee()->signature(); 3409 // method handle call to virtual method 3410 bool has_receiver = x->callee()->is_loaded() && !x->callee()->is_static() && !Bytecodes::has_receiver(bc); 3411 ciSignatureStream callee_signature_stream(callee_signature, has_receiver ? x->callee()->holder() : NULL); 3412 3413 bool ignored_will_link; 3414 ciSignature* signature_at_call = NULL; 3415 x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); 3416 ciSignatureStream signature_at_call_stream(signature_at_call); 3417 3418 // if called through method handle invoke, some arguments may have been popped 3419 for (int i = 0; i < stop && i+start < x->nb_profiled_args(); i++) { 3420 int off = in_bytes(TypeEntriesAtCall::argument_type_offset(i)) - in_bytes(TypeEntriesAtCall::args_data_offset()); 3421 ciKlass* exact = profile_type(md, base_offset, off, 3422 args->type(i), x->profiled_arg_at(i+start), mdp, 3423 !x->arg_needs_null_check(i+start), 3424 signature_at_call_stream.next_klass(), callee_signature_stream.next_klass()); 3425 if (exact != NULL) { 3426 md->set_argument_type(bci, i, exact); 3427 } 3428 } 3429 } else { 3430 #ifdef ASSERT 3431 Bytecodes::Code code = x->method()->raw_code_at_bci(x->bci_of_invoke()); 3432 int n = x->nb_profiled_args(); 3433 assert(MethodData::profile_parameters() && (MethodData::profile_arguments_jsr292_only() || 3434 (x->inlined() && ((code == Bytecodes::_invokedynamic && n <= 1) || (code == Bytecodes::_invokehandle && n <= 2)))), 3435 "only at JSR292 bytecodes"); 3436 #endif 3437 } 3438 } 3439 } 3440 } 3441 3442 // profile parameters on entry to an inlined method 3443 void LIRGenerator::profile_parameters_at_call(ProfileCall* x) { 3444 if (compilation()->profile_parameters() && x->inlined()) { 3445 ciMethodData* md = x->callee()->method_data_or_null(); 3446 if (md != NULL) { 3447 ciParametersTypeData* parameters_type_data = md->parameters_type_data(); 3448 if (parameters_type_data != NULL) { 3449 ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); 3450 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3451 bool has_receiver = !x->callee()->is_static(); 3452 ciSignature* sig = x->callee()->signature(); 3453 ciSignatureStream sig_stream(sig, has_receiver ? x->callee()->holder() : NULL); 3454 int i = 0; // to iterate on the Instructions 3455 Value arg = x->recv(); 3456 bool not_null = false; 3457 int bci = x->bci_of_invoke(); 3458 Bytecodes::Code bc = x->method()->java_code_at_bci(bci); 3459 // The first parameter is the receiver so that's what we start 3460 // with if it exists. One exception is method handle call to 3461 // virtual method: the receiver is in the args list 3462 if (arg == NULL || !Bytecodes::has_receiver(bc)) { 3463 i = 1; 3464 arg = x->profiled_arg_at(0); 3465 not_null = !x->arg_needs_null_check(0); 3466 } 3467 int k = 0; // to iterate on the profile data 3468 for (;;) { 3469 intptr_t profiled_k = parameters->type(k); 3470 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), 3471 in_bytes(ParametersTypeData::type_offset(k)) - in_bytes(ParametersTypeData::type_offset(0)), 3472 profiled_k, arg, mdp, not_null, sig_stream.next_klass(), NULL); 3473 // If the profile is known statically set it once for all and do not emit any code 3474 if (exact != NULL) { 3475 md->set_parameter_type(k, exact); 3476 } 3477 k++; 3478 if (k >= parameters_type_data->number_of_parameters()) { 3479 #ifdef ASSERT 3480 int extra = 0; 3481 if (MethodData::profile_arguments() && TypeProfileParmsLimit != -1 && 3482 x->nb_profiled_args() >= TypeProfileParmsLimit && 3483 x->recv() != NULL && Bytecodes::has_receiver(bc)) { 3484 extra += 1; 3485 } 3486 assert(i == x->nb_profiled_args() - extra || (TypeProfileParmsLimit != -1 && TypeProfileArgsLimit > TypeProfileParmsLimit), "unused parameters?"); 3487 #endif 3488 break; 3489 } 3490 arg = x->profiled_arg_at(i); 3491 not_null = !x->arg_needs_null_check(i); 3492 i++; 3493 } 3494 } 3495 } 3496 } 3497 } 3498 3499 void LIRGenerator::do_ProfileCall(ProfileCall* x) { 3500 // Need recv in a temporary register so it interferes with the other temporaries 3501 LIR_Opr recv = LIR_OprFact::illegalOpr; 3502 LIR_Opr mdo = new_register(T_METADATA); 3503 // tmp is used to hold the counters on SPARC 3504 LIR_Opr tmp = new_pointer_register(); 3505 3506 if (x->nb_profiled_args() > 0) { 3507 profile_arguments(x); 3508 } 3509 3510 // profile parameters on inlined method entry including receiver 3511 if (x->recv() != NULL || x->nb_profiled_args() > 0) { 3512 profile_parameters_at_call(x); 3513 } 3514 3515 if (x->recv() != NULL) { 3516 LIRItem value(x->recv(), this); 3517 value.load_item(); 3518 recv = new_register(T_OBJECT); 3519 __ move(value.result(), recv); 3520 } 3521 __ profile_call(x->method(), x->bci_of_invoke(), x->callee(), mdo, recv, tmp, x->known_holder()); 3522 } 3523 3524 void LIRGenerator::do_ProfileReturnType(ProfileReturnType* x) { 3525 int bci = x->bci_of_invoke(); 3526 ciMethodData* md = x->method()->method_data_or_null(); 3527 assert(md != NULL, "Sanity"); 3528 ciProfileData* data = md->bci_to_data(bci); 3529 if (data != NULL) { 3530 assert(data->is_CallTypeData() || data->is_VirtualCallTypeData(), "wrong profile data type"); 3531 ciReturnTypeEntry* ret = data->is_CallTypeData() ? ((ciCallTypeData*)data)->ret() : ((ciVirtualCallTypeData*)data)->ret(); 3532 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3533 3534 bool ignored_will_link; 3535 ciSignature* signature_at_call = NULL; 3536 x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); 3537 3538 // The offset within the MDO of the entry to update may be too large 3539 // to be used in load/store instructions on some platforms. So have 3540 // profile_type() compute the address of the profile in a register. 3541 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(data, ret->type_offset()), 0, 3542 ret->type(), x->ret(), mdp, 3543 !x->needs_null_check(), 3544 signature_at_call->return_type()->as_klass(), 3545 x->callee()->signature()->return_type()->as_klass()); 3546 if (exact != NULL) { 3547 md->set_return_type(bci, exact); 3548 } 3549 } 3550 } 3551 3552 void LIRGenerator::do_ProfileInvoke(ProfileInvoke* x) { 3553 // We can safely ignore accessors here, since c2 will inline them anyway, 3554 // accessors are also always mature. 3555 if (!x->inlinee()->is_accessor()) { 3556 CodeEmitInfo* info = state_for(x, x->state(), true); 3557 // Notify the runtime very infrequently only to take care of counter overflows 3558 int freq_log = Tier23InlineeNotifyFreqLog; 3559 double scale; 3560 if (_method->has_option_value("CompileThresholdScaling", scale)) { 3561 freq_log = CompilerConfig::scaled_freq_log(freq_log, scale); 3562 } 3563 increment_event_counter_impl(info, x->inlinee(), LIR_OprFact::intConst(InvocationCounter::count_increment), right_n_bits(freq_log), InvocationEntryBci, false, true); 3564 } 3565 } 3566 3567 void LIRGenerator::increment_backedge_counter_conditionally(LIR_Condition cond, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info, int left_bci, int right_bci, int bci) { 3568 if (compilation()->count_backedges()) { 3569 __ cmp(cond, left, right); 3570 LIR_Opr step = new_register(T_INT); 3571 LIR_Opr plus_one = LIR_OprFact::intConst(InvocationCounter::count_increment); 3572 LIR_Opr zero = LIR_OprFact::intConst(0); 3573 __ cmove(cond, 3574 (left_bci < bci) ? plus_one : zero, 3575 (right_bci < bci) ? plus_one : zero, 3576 step, left->type()); 3577 increment_backedge_counter(info, step, bci); 3578 } 3579 } 3580 3581 3582 void LIRGenerator::increment_event_counter(CodeEmitInfo* info, LIR_Opr step, int bci, bool backedge) { 3583 int freq_log = 0; 3584 int level = compilation()->env()->comp_level(); 3585 if (level == CompLevel_limited_profile) { 3586 freq_log = (backedge ? Tier2BackedgeNotifyFreqLog : Tier2InvokeNotifyFreqLog); 3587 } else if (level == CompLevel_full_profile) { 3588 freq_log = (backedge ? Tier3BackedgeNotifyFreqLog : Tier3InvokeNotifyFreqLog); 3589 } else { 3590 ShouldNotReachHere(); 3591 } 3592 // Increment the appropriate invocation/backedge counter and notify the runtime. 3593 double scale; 3594 if (_method->has_option_value("CompileThresholdScaling", scale)) { 3595 freq_log = CompilerConfig::scaled_freq_log(freq_log, scale); 3596 } 3597 increment_event_counter_impl(info, info->scope()->method(), step, right_n_bits(freq_log), bci, backedge, true); 3598 } 3599 3600 void LIRGenerator::decrement_age(CodeEmitInfo* info) { 3601 ciMethod* method = info->scope()->method(); 3602 MethodCounters* mc_adr = method->ensure_method_counters(); 3603 if (mc_adr != NULL) { 3604 LIR_Opr mc = new_pointer_register(); 3605 __ move(LIR_OprFact::intptrConst(mc_adr), mc); 3606 int offset = in_bytes(MethodCounters::nmethod_age_offset()); 3607 LIR_Address* counter = new LIR_Address(mc, offset, T_INT); 3608 LIR_Opr result = new_register(T_INT); 3609 __ load(counter, result); 3610 __ sub(result, LIR_OprFact::intConst(1), result); 3611 __ store(result, counter); 3612 // DeoptimizeStub will reexecute from the current state in code info. 3613 CodeStub* deopt = new DeoptimizeStub(info, Deoptimization::Reason_tenured, 3614 Deoptimization::Action_make_not_entrant); 3615 __ cmp(lir_cond_lessEqual, result, LIR_OprFact::intConst(0)); 3616 __ branch(lir_cond_lessEqual, T_INT, deopt); 3617 } 3618 } 3619 3620 3621 void LIRGenerator::increment_event_counter_impl(CodeEmitInfo* info, 3622 ciMethod *method, LIR_Opr step, int frequency, 3623 int bci, bool backedge, bool notify) { 3624 assert(frequency == 0 || is_power_of_2(frequency + 1), "Frequency must be x^2 - 1 or 0"); 3625 int level = _compilation->env()->comp_level(); 3626 assert(level > CompLevel_simple, "Shouldn't be here"); 3627 3628 int offset = -1; 3629 LIR_Opr counter_holder = NULL; 3630 if (level == CompLevel_limited_profile) { 3631 MethodCounters* counters_adr = method->ensure_method_counters(); 3632 if (counters_adr == NULL) { 3633 bailout("method counters allocation failed"); 3634 return; 3635 } 3636 counter_holder = new_pointer_register(); 3637 __ move(LIR_OprFact::intptrConst(counters_adr), counter_holder); 3638 offset = in_bytes(backedge ? MethodCounters::backedge_counter_offset() : 3639 MethodCounters::invocation_counter_offset()); 3640 } else if (level == CompLevel_full_profile) { 3641 counter_holder = new_register(T_METADATA); 3642 offset = in_bytes(backedge ? MethodData::backedge_counter_offset() : 3643 MethodData::invocation_counter_offset()); 3644 ciMethodData* md = method->method_data_or_null(); 3645 assert(md != NULL, "Sanity"); 3646 __ metadata2reg(md->constant_encoding(), counter_holder); 3647 } else { 3648 ShouldNotReachHere(); 3649 } 3650 LIR_Address* counter = new LIR_Address(counter_holder, offset, T_INT); 3651 LIR_Opr result = new_register(T_INT); 3652 __ load(counter, result); 3653 __ add(result, step, result); 3654 __ store(result, counter); 3655 if (notify && (!backedge || UseOnStackReplacement)) { 3656 LIR_Opr meth = LIR_OprFact::metadataConst(method->constant_encoding()); 3657 // The bci for info can point to cmp for if's we want the if bci 3658 CodeStub* overflow = new CounterOverflowStub(info, bci, meth); 3659 int freq = frequency << InvocationCounter::count_shift; 3660 if (freq == 0) { 3661 if (!step->is_constant()) { 3662 __ cmp(lir_cond_notEqual, step, LIR_OprFact::intConst(0)); 3663 __ branch(lir_cond_notEqual, T_ILLEGAL, overflow); 3664 } else { 3665 __ branch(lir_cond_always, T_ILLEGAL, overflow); 3666 } 3667 } else { 3668 LIR_Opr mask = load_immediate(freq, T_INT); 3669 if (!step->is_constant()) { 3670 // If step is 0, make sure the overflow check below always fails 3671 __ cmp(lir_cond_notEqual, step, LIR_OprFact::intConst(0)); 3672 __ cmove(lir_cond_notEqual, result, LIR_OprFact::intConst(InvocationCounter::count_increment), result, T_INT); 3673 } 3674 __ logical_and(result, mask, result); 3675 __ cmp(lir_cond_equal, result, LIR_OprFact::intConst(0)); 3676 __ branch(lir_cond_equal, T_INT, overflow); 3677 } 3678 __ branch_destination(overflow->continuation()); 3679 } 3680 } 3681 3682 void LIRGenerator::do_RuntimeCall(RuntimeCall* x) { 3683 LIR_OprList* args = new LIR_OprList(x->number_of_arguments()); 3684 BasicTypeList* signature = new BasicTypeList(x->number_of_arguments()); 3685 3686 if (x->pass_thread()) { 3687 signature->append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 3688 args->append(getThreadPointer()); 3689 } 3690 3691 for (int i = 0; i < x->number_of_arguments(); i++) { 3692 Value a = x->argument_at(i); 3693 LIRItem* item = new LIRItem(a, this); 3694 item->load_item(); 3695 args->append(item->result()); 3696 signature->append(as_BasicType(a->type())); 3697 } 3698 3699 LIR_Opr result = call_runtime(signature, args, x->entry(), x->type(), NULL); 3700 if (x->type() == voidType) { 3701 set_no_result(x); 3702 } else { 3703 __ move(result, rlock_result(x)); 3704 } 3705 } 3706 3707 #ifdef ASSERT 3708 void LIRGenerator::do_Assert(Assert *x) { 3709 ValueTag tag = x->x()->type()->tag(); 3710 If::Condition cond = x->cond(); 3711 3712 LIRItem xitem(x->x(), this); 3713 LIRItem yitem(x->y(), this); 3714 LIRItem* xin = &xitem; 3715 LIRItem* yin = &yitem; 3716 3717 assert(tag == intTag, "Only integer assertions are valid!"); 3718 3719 xin->load_item(); 3720 yin->dont_load_item(); 3721 3722 set_no_result(x); 3723 3724 LIR_Opr left = xin->result(); 3725 LIR_Opr right = yin->result(); 3726 3727 __ lir_assert(lir_cond(x->cond()), left, right, x->message(), true); 3728 } 3729 #endif 3730 3731 void LIRGenerator::do_RangeCheckPredicate(RangeCheckPredicate *x) { 3732 3733 3734 Instruction *a = x->x(); 3735 Instruction *b = x->y(); 3736 if (!a || StressRangeCheckElimination) { 3737 assert(!b || StressRangeCheckElimination, "B must also be null"); 3738 3739 CodeEmitInfo *info = state_for(x, x->state()); 3740 CodeStub* stub = new PredicateFailedStub(info); 3741 3742 __ jump(stub); 3743 } else if (a->type()->as_IntConstant() && b->type()->as_IntConstant()) { 3744 int a_int = a->type()->as_IntConstant()->value(); 3745 int b_int = b->type()->as_IntConstant()->value(); 3746 3747 bool ok = false; 3748 3749 switch(x->cond()) { 3750 case Instruction::eql: ok = (a_int == b_int); break; 3751 case Instruction::neq: ok = (a_int != b_int); break; 3752 case Instruction::lss: ok = (a_int < b_int); break; 3753 case Instruction::leq: ok = (a_int <= b_int); break; 3754 case Instruction::gtr: ok = (a_int > b_int); break; 3755 case Instruction::geq: ok = (a_int >= b_int); break; 3756 case Instruction::aeq: ok = ((unsigned int)a_int >= (unsigned int)b_int); break; 3757 case Instruction::beq: ok = ((unsigned int)a_int <= (unsigned int)b_int); break; 3758 default: ShouldNotReachHere(); 3759 } 3760 3761 if (ok) { 3762 3763 CodeEmitInfo *info = state_for(x, x->state()); 3764 CodeStub* stub = new PredicateFailedStub(info); 3765 3766 __ jump(stub); 3767 } 3768 } else { 3769 3770 ValueTag tag = x->x()->type()->tag(); 3771 If::Condition cond = x->cond(); 3772 LIRItem xitem(x->x(), this); 3773 LIRItem yitem(x->y(), this); 3774 LIRItem* xin = &xitem; 3775 LIRItem* yin = &yitem; 3776 3777 assert(tag == intTag, "Only integer deoptimizations are valid!"); 3778 3779 xin->load_item(); 3780 yin->dont_load_item(); 3781 set_no_result(x); 3782 3783 LIR_Opr left = xin->result(); 3784 LIR_Opr right = yin->result(); 3785 3786 CodeEmitInfo *info = state_for(x, x->state()); 3787 CodeStub* stub = new PredicateFailedStub(info); 3788 3789 __ cmp(lir_cond(cond), left, right); 3790 __ branch(lir_cond(cond), right->type(), stub); 3791 } 3792 } 3793 3794 3795 LIR_Opr LIRGenerator::call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info) { 3796 LIRItemList args(1); 3797 LIRItem value(arg1, this); 3798 args.append(&value); 3799 BasicTypeList signature; 3800 signature.append(as_BasicType(arg1->type())); 3801 3802 return call_runtime(&signature, &args, entry, result_type, info); 3803 } 3804 3805 3806 LIR_Opr LIRGenerator::call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info) { 3807 LIRItemList args(2); 3808 LIRItem value1(arg1, this); 3809 LIRItem value2(arg2, this); 3810 args.append(&value1); 3811 args.append(&value2); 3812 BasicTypeList signature; 3813 signature.append(as_BasicType(arg1->type())); 3814 signature.append(as_BasicType(arg2->type())); 3815 3816 return call_runtime(&signature, &args, entry, result_type, info); 3817 } 3818 3819 3820 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIR_OprList* args, 3821 address entry, ValueType* result_type, CodeEmitInfo* info) { 3822 // get a result register 3823 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 3824 LIR_Opr result = LIR_OprFact::illegalOpr; 3825 if (result_type->tag() != voidTag) { 3826 result = new_register(result_type); 3827 phys_reg = result_register_for(result_type); 3828 } 3829 3830 // move the arguments into the correct location 3831 CallingConvention* cc = frame_map()->c_calling_convention(signature); 3832 assert(cc->length() == args->length(), "argument mismatch"); 3833 for (int i = 0; i < args->length(); i++) { 3834 LIR_Opr arg = args->at(i); 3835 LIR_Opr loc = cc->at(i); 3836 if (loc->is_register()) { 3837 __ move(arg, loc); 3838 } else { 3839 LIR_Address* addr = loc->as_address_ptr(); 3840 // if (!can_store_as_constant(arg)) { 3841 // LIR_Opr tmp = new_register(arg->type()); 3842 // __ move(arg, tmp); 3843 // arg = tmp; 3844 // } 3845 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3846 __ unaligned_move(arg, addr); 3847 } else { 3848 __ move(arg, addr); 3849 } 3850 } 3851 } 3852 3853 if (info) { 3854 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 3855 } else { 3856 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 3857 } 3858 if (result->is_valid()) { 3859 __ move(phys_reg, result); 3860 } 3861 return result; 3862 } 3863 3864 3865 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIRItemList* args, 3866 address entry, ValueType* result_type, CodeEmitInfo* info) { 3867 // get a result register 3868 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 3869 LIR_Opr result = LIR_OprFact::illegalOpr; 3870 if (result_type->tag() != voidTag) { 3871 result = new_register(result_type); 3872 phys_reg = result_register_for(result_type); 3873 } 3874 3875 // move the arguments into the correct location 3876 CallingConvention* cc = frame_map()->c_calling_convention(signature); 3877 3878 assert(cc->length() == args->length(), "argument mismatch"); 3879 for (int i = 0; i < args->length(); i++) { 3880 LIRItem* arg = args->at(i); 3881 LIR_Opr loc = cc->at(i); 3882 if (loc->is_register()) { 3883 arg->load_item_force(loc); 3884 } else { 3885 LIR_Address* addr = loc->as_address_ptr(); 3886 arg->load_for_store(addr->type()); 3887 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3888 __ unaligned_move(arg->result(), addr); 3889 } else { 3890 __ move(arg->result(), addr); 3891 } 3892 } 3893 } 3894 3895 if (info) { 3896 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 3897 } else { 3898 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 3899 } 3900 if (result->is_valid()) { 3901 __ move(phys_reg, result); 3902 } 3903 return result; 3904 } 3905 3906 void LIRGenerator::do_MemBar(MemBar* x) { 3907 LIR_Code code = x->code(); 3908 switch(code) { 3909 case lir_membar_acquire : __ membar_acquire(); break; 3910 case lir_membar_release : __ membar_release(); break; 3911 case lir_membar : __ membar(); break; 3912 case lir_membar_loadload : __ membar_loadload(); break; 3913 case lir_membar_storestore: __ membar_storestore(); break; 3914 case lir_membar_loadstore : __ membar_loadstore(); break; 3915 case lir_membar_storeload : __ membar_storeload(); break; 3916 default : ShouldNotReachHere(); break; 3917 } 3918 } 3919 3920 LIR_Opr LIRGenerator::mask_boolean(LIR_Opr array, LIR_Opr value, CodeEmitInfo*& null_check_info) { 3921 LIR_Opr value_fixed = rlock_byte(T_BYTE); 3922 if (TwoOperandLIRForm) { 3923 __ move(value, value_fixed); 3924 __ logical_and(value_fixed, LIR_OprFact::intConst(1), value_fixed); 3925 } else { 3926 __ logical_and(value, LIR_OprFact::intConst(1), value_fixed); 3927 } 3928 LIR_Opr klass = new_register(T_METADATA); 3929 __ move(new LIR_Address(array, oopDesc::klass_offset_in_bytes(), T_ADDRESS), klass, null_check_info); 3930 null_check_info = NULL; 3931 LIR_Opr layout = new_register(T_INT); 3932 __ move(new LIR_Address(klass, in_bytes(Klass::layout_helper_offset()), T_INT), layout); 3933 int diffbit = Klass::layout_helper_boolean_diffbit(); 3934 __ logical_and(layout, LIR_OprFact::intConst(diffbit), layout); 3935 __ cmp(lir_cond_notEqual, layout, LIR_OprFact::intConst(0)); 3936 __ cmove(lir_cond_notEqual, value_fixed, value, value_fixed, T_BYTE); 3937 value = value_fixed; 3938 return value; 3939 } 3940 3941 LIR_Opr LIRGenerator::maybe_mask_boolean(StoreIndexed* x, LIR_Opr array, LIR_Opr value, CodeEmitInfo*& null_check_info) { 3942 if (x->check_boolean()) { 3943 value = mask_boolean(array, value, null_check_info); 3944 } 3945 return value; 3946 }