1 /* 2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_C1_C1_LIRGENERATOR_HPP 26 #define SHARE_VM_C1_C1_LIRGENERATOR_HPP 27 28 #include "c1/c1_Instruction.hpp" 29 #include "c1/c1_LIR.hpp" 30 #include "ci/ciMethodData.hpp" 31 #include "utilities/sizes.hpp" 32 33 // The classes responsible for code emission and register allocation 34 35 36 class LIRGenerator; 37 class LIREmitter; 38 class Invoke; 39 class SwitchRange; 40 class LIRItem; 41 42 define_array(LIRItemArray, LIRItem*) 43 define_stack(LIRItemList, LIRItemArray) 44 45 class SwitchRange: public CompilationResourceObj { 46 private: 47 int _low_key; 48 int _high_key; 49 BlockBegin* _sux; 50 public: 51 SwitchRange(int start_key, BlockBegin* sux): _low_key(start_key), _high_key(start_key), _sux(sux) {} 52 void set_high_key(int key) { _high_key = key; } 53 54 int high_key() const { return _high_key; } 55 int low_key() const { return _low_key; } 56 BlockBegin* sux() const { return _sux; } 57 }; 58 59 define_array(SwitchRangeArray, SwitchRange*) 60 define_stack(SwitchRangeList, SwitchRangeArray) 61 62 63 class ResolveNode; 64 65 define_array(NodeArray, ResolveNode*); 66 define_stack(NodeList, NodeArray); 67 68 69 // Node objects form a directed graph of LIR_Opr 70 // Edges between Nodes represent moves from one Node to its destinations 71 class ResolveNode: public CompilationResourceObj { 72 private: 73 LIR_Opr _operand; // the source or destinaton 74 NodeList _destinations; // for the operand 75 bool _assigned; // Value assigned to this Node? 76 bool _visited; // Node already visited? 77 bool _start_node; // Start node already visited? 78 79 public: 80 ResolveNode(LIR_Opr operand) 81 : _operand(operand) 82 , _assigned(false) 83 , _visited(false) 84 , _start_node(false) {}; 85 86 // accessors 87 LIR_Opr operand() const { return _operand; } 88 int no_of_destinations() const { return _destinations.length(); } 89 ResolveNode* destination_at(int i) { return _destinations[i]; } 90 bool assigned() const { return _assigned; } 91 bool visited() const { return _visited; } 92 bool start_node() const { return _start_node; } 93 94 // modifiers 95 void append(ResolveNode* dest) { _destinations.append(dest); } 96 void set_assigned() { _assigned = true; } 97 void set_visited() { _visited = true; } 98 void set_start_node() { _start_node = true; } 99 }; 100 101 102 // This is shared state to be used by the PhiResolver so the operand 103 // arrays don't have to be reallocated for reach resolution. 104 class PhiResolverState: public CompilationResourceObj { 105 friend class PhiResolver; 106 107 private: 108 NodeList _virtual_operands; // Nodes where the operand is a virtual register 109 NodeList _other_operands; // Nodes where the operand is not a virtual register 110 NodeList _vreg_table; // Mapping from virtual register to Node 111 112 public: 113 PhiResolverState() {} 114 115 void reset(int max_vregs); 116 }; 117 118 119 // class used to move value of phi operand to phi function 120 class PhiResolver: public CompilationResourceObj { 121 private: 122 LIRGenerator* _gen; 123 PhiResolverState& _state; // temporary state cached by LIRGenerator 124 125 ResolveNode* _loop; 126 LIR_Opr _temp; 127 128 // access to shared state arrays 129 NodeList& virtual_operands() { return _state._virtual_operands; } 130 NodeList& other_operands() { return _state._other_operands; } 131 NodeList& vreg_table() { return _state._vreg_table; } 132 133 ResolveNode* create_node(LIR_Opr opr, bool source); 134 ResolveNode* source_node(LIR_Opr opr) { return create_node(opr, true); } 135 ResolveNode* destination_node(LIR_Opr opr) { return create_node(opr, false); } 136 137 void emit_move(LIR_Opr src, LIR_Opr dest); 138 void move_to_temp(LIR_Opr src); 139 void move_temp_to(LIR_Opr dest); 140 void move(ResolveNode* src, ResolveNode* dest); 141 142 LIRGenerator* gen() { 143 return _gen; 144 } 145 146 public: 147 PhiResolver(LIRGenerator* _lir_gen, int max_vregs); 148 ~PhiResolver(); 149 150 void move(LIR_Opr src, LIR_Opr dest); 151 }; 152 153 154 // only the classes below belong in the same file 155 class LIRGenerator: public InstructionVisitor, public BlockClosure { 156 157 private: 158 Compilation* _compilation; 159 ciMethod* _method; // method that we are compiling 160 PhiResolverState _resolver_state; 161 BlockBegin* _block; 162 int _virtual_register_number; 163 Values _instruction_for_operand; 164 BitMap2D _vreg_flags; // flags which can be set on a per-vreg basis 165 LIR_List* _lir; 166 BarrierSet* _bs; 167 168 LIRGenerator* gen() { 169 return this; 170 } 171 172 #ifdef ASSERT 173 LIR_List* lir(const char * file, int line) const { 174 _lir->set_file_and_line(file, line); 175 return _lir; 176 } 177 #endif 178 LIR_List* lir() const { 179 return _lir; 180 } 181 182 // a simple cache of constants used within a block 183 GrowableArray<LIR_Const*> _constants; 184 LIR_OprList _reg_for_constants; 185 Values _unpinned_constants; 186 187 friend class PhiResolver; 188 189 // unified bailout support 190 void bailout(const char* msg) const { compilation()->bailout(msg); } 191 bool bailed_out() const { return compilation()->bailed_out(); } 192 193 void block_do_prolog(BlockBegin* block); 194 void block_do_epilog(BlockBegin* block); 195 196 // register allocation 197 LIR_Opr rlock(Value instr); // lock a free register 198 LIR_Opr rlock_result(Value instr); 199 LIR_Opr rlock_result(Value instr, BasicType type); 200 LIR_Opr rlock_byte(BasicType type); 201 LIR_Opr rlock_callee_saved(BasicType type); 202 203 // get a constant into a register and get track of what register was used 204 LIR_Opr load_constant(Constant* x); 205 LIR_Opr load_constant(LIR_Const* constant); 206 207 // Given an immediate value, return an operand usable in logical ops. 208 LIR_Opr load_immediate(int x, BasicType type); 209 210 void set_result(Value x, LIR_Opr opr) { 211 assert(opr->is_valid(), "must set to valid value"); 212 assert(x->operand()->is_illegal(), "operand should never change"); 213 assert(!opr->is_register() || opr->is_virtual(), "should never set result to a physical register"); 214 x->set_operand(opr); 215 assert(opr == x->operand(), "must be"); 216 if (opr->is_virtual()) { 217 _instruction_for_operand.at_put_grow(opr->vreg_number(), x, NULL); 218 } 219 } 220 void set_no_result(Value x) { assert(!x->has_uses(), "can't have use"); x->clear_operand(); } 221 222 friend class LIRItem; 223 224 LIR_Opr round_item(LIR_Opr opr); 225 LIR_Opr force_to_spill(LIR_Opr value, BasicType t); 226 227 PhiResolverState& resolver_state() { return _resolver_state; } 228 229 void move_to_phi(PhiResolver* resolver, Value cur_val, Value sux_val); 230 void move_to_phi(ValueStack* cur_state); 231 232 // code emission 233 void do_ArithmeticOp_Long (ArithmeticOp* x); 234 void do_ArithmeticOp_Int (ArithmeticOp* x); 235 void do_ArithmeticOp_FPU (ArithmeticOp* x); 236 237 // platform dependent 238 LIR_Opr getThreadPointer(); 239 240 void do_RegisterFinalizer(Intrinsic* x); 241 void do_isInstance(Intrinsic* x); 242 void do_getClass(Intrinsic* x); 243 void do_currentThread(Intrinsic* x); 244 void do_MathIntrinsic(Intrinsic* x); 245 void do_ArrayCopy(Intrinsic* x); 246 void do_CompareAndSwap(Intrinsic* x, ValueType* type); 247 void do_NIOCheckIndex(Intrinsic* x); 248 void do_FPIntrinsics(Intrinsic* x); 249 void do_Reference_get(Intrinsic* x); 250 void do_update_CRC32(Intrinsic* x); 251 252 void do_UnsafePrefetch(UnsafePrefetch* x, bool is_store); 253 254 LIR_Opr call_runtime(BasicTypeArray* signature, LIRItemList* args, address entry, ValueType* result_type, CodeEmitInfo* info); 255 LIR_Opr call_runtime(BasicTypeArray* signature, LIR_OprList* args, address entry, ValueType* result_type, CodeEmitInfo* info); 256 257 // convenience functions 258 LIR_Opr call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info); 259 LIR_Opr call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info); 260 261 // GC Barriers 262 263 // generic interface 264 265 void pre_barrier(LIR_Opr addr_opr, LIR_Opr pre_val, bool do_load, bool patch, CodeEmitInfo* info); 266 void post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val); 267 268 // specific implementations 269 // pre barriers 270 271 void G1SATBCardTableModRef_pre_barrier(LIR_Opr addr_opr, LIR_Opr pre_val, 272 bool do_load, bool patch, CodeEmitInfo* info); 273 274 // post barriers 275 276 void G1SATBCardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val); 277 void CardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val); 278 279 280 static LIR_Opr result_register_for(ValueType* type, bool callee = false); 281 282 ciObject* get_jobject_constant(Value value); 283 284 LIRItemList* invoke_visit_arguments(Invoke* x); 285 void invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list); 286 287 void trace_block_entry(BlockBegin* block); 288 289 // volatile field operations are never patchable because a klass 290 // must be loaded to know it's volatile which means that the offset 291 // it always known as well. 292 void volatile_field_store(LIR_Opr value, LIR_Address* address, CodeEmitInfo* info); 293 void volatile_field_load(LIR_Address* address, LIR_Opr result, CodeEmitInfo* info); 294 295 void put_Object_unsafe(LIR_Opr src, LIR_Opr offset, LIR_Opr data, BasicType type, bool is_volatile); 296 void get_Object_unsafe(LIR_Opr dest, LIR_Opr src, LIR_Opr offset, BasicType type, bool is_volatile); 297 298 void arithmetic_call_op (Bytecodes::Code code, LIR_Opr result, LIR_OprList* args); 299 300 void increment_counter(address counter, BasicType type, int step = 1); 301 void increment_counter(LIR_Address* addr, int step = 1); 302 303 // is_strictfp is only needed for mul and div (and only generates different code on i486) 304 void arithmetic_op(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp, CodeEmitInfo* info = NULL); 305 // machine dependent. returns true if it emitted code for the multiply 306 bool strength_reduce_multiply(LIR_Opr left, int constant, LIR_Opr result, LIR_Opr tmp); 307 308 void store_stack_parameter (LIR_Opr opr, ByteSize offset_from_sp_in_bytes); 309 310 void klass2reg_with_patching(LIR_Opr r, ciMetadata* obj, CodeEmitInfo* info); 311 312 // this loads the length and compares against the index 313 void array_range_check (LIR_Opr array, LIR_Opr index, CodeEmitInfo* null_check_info, CodeEmitInfo* range_check_info); 314 // For java.nio.Buffer.checkIndex 315 void nio_range_check (LIR_Opr buffer, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info); 316 317 void arithmetic_op_int (Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr tmp); 318 void arithmetic_op_long (Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info = NULL); 319 void arithmetic_op_fpu (Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp = LIR_OprFact::illegalOpr); 320 321 void shift_op (Bytecodes::Code code, LIR_Opr dst_reg, LIR_Opr value, LIR_Opr count, LIR_Opr tmp); 322 323 void logic_op (Bytecodes::Code code, LIR_Opr dst_reg, LIR_Opr left, LIR_Opr right); 324 325 void monitor_enter (LIR_Opr object, LIR_Opr lock, LIR_Opr hdr, LIR_Opr scratch, int monitor_no, CodeEmitInfo* info_for_exception, CodeEmitInfo* info); 326 void monitor_exit (LIR_Opr object, LIR_Opr lock, LIR_Opr hdr, LIR_Opr scratch, int monitor_no); 327 328 void new_instance (LIR_Opr dst, ciInstanceKlass* klass, LIR_Opr scratch1, LIR_Opr scratch2, LIR_Opr scratch3, LIR_Opr scratch4, LIR_Opr klass_reg, CodeEmitInfo* info); 329 330 // machine dependent 331 void cmp_mem_int(LIR_Condition condition, LIR_Opr base, int disp, int c, CodeEmitInfo* info); 332 void cmp_reg_mem(LIR_Condition condition, LIR_Opr reg, LIR_Opr base, int disp, BasicType type, CodeEmitInfo* info); 333 void cmp_reg_mem(LIR_Condition condition, LIR_Opr reg, LIR_Opr base, LIR_Opr disp, BasicType type, CodeEmitInfo* info); 334 335 void arraycopy_helper(Intrinsic* x, int* flags, ciArrayKlass** expected_type); 336 337 // returns a LIR_Address to address an array location. May also 338 // emit some code as part of address calculation. If 339 // needs_card_mark is true then compute the full address for use by 340 // both the store and the card mark. 341 LIR_Address* generate_address(LIR_Opr base, 342 LIR_Opr index, int shift, 343 int disp, 344 BasicType type); 345 LIR_Address* generate_address(LIR_Opr base, int disp, BasicType type) { 346 return generate_address(base, LIR_OprFact::illegalOpr, 0, disp, type); 347 } 348 LIR_Address* emit_array_address(LIR_Opr array_opr, LIR_Opr index_opr, BasicType type, bool needs_card_mark); 349 350 // the helper for generate_address 351 void add_large_constant(LIR_Opr src, int c, LIR_Opr dest); 352 353 // machine preferences and characteristics 354 bool can_inline_as_constant(Value i) const; 355 bool can_inline_as_constant(LIR_Const* c) const; 356 bool can_store_as_constant(Value i, BasicType type) const; 357 358 LIR_Opr safepoint_poll_register(); 359 360 void profile_branch(If* if_instr, If::Condition cond); 361 void increment_event_counter_impl(CodeEmitInfo* info, 362 ciMethod *method, int frequency, 363 int bci, bool backedge, bool notify); 364 void increment_event_counter(CodeEmitInfo* info, int bci, bool backedge); 365 void increment_invocation_counter(CodeEmitInfo *info) { 366 if (compilation()->count_invocations()) { 367 increment_event_counter(info, InvocationEntryBci, false); 368 } 369 } 370 void increment_backedge_counter(CodeEmitInfo* info, int bci) { 371 if (compilation()->count_backedges()) { 372 increment_event_counter(info, bci, true); 373 } 374 } 375 376 CodeEmitInfo* state_for(Instruction* x, ValueStack* state, bool ignore_xhandler = false); 377 CodeEmitInfo* state_for(Instruction* x); 378 379 // allocates a virtual register for this instruction if 380 // one isn't already allocated. Only for Phi and Local. 381 LIR_Opr operand_for_instruction(Instruction *x); 382 383 void set_block(BlockBegin* block) { _block = block; } 384 385 void block_prolog(BlockBegin* block); 386 void block_epilog(BlockBegin* block); 387 388 void do_root (Instruction* instr); 389 void walk (Instruction* instr); 390 391 void bind_block_entry(BlockBegin* block); 392 void start_block(BlockBegin* block); 393 394 LIR_Opr new_register(BasicType type); 395 LIR_Opr new_register(Value value) { return new_register(as_BasicType(value->type())); } 396 LIR_Opr new_register(ValueType* type) { return new_register(as_BasicType(type)); } 397 398 // returns a register suitable for doing pointer math 399 LIR_Opr new_pointer_register() { 400 #ifdef _LP64 401 return new_register(T_LONG); 402 #else 403 return new_register(T_INT); 404 #endif 405 } 406 407 static LIR_Condition lir_cond(If::Condition cond) { 408 LIR_Condition l; 409 switch (cond) { 410 case If::eql: l = lir_cond_equal; break; 411 case If::neq: l = lir_cond_notEqual; break; 412 case If::lss: l = lir_cond_less; break; 413 case If::leq: l = lir_cond_lessEqual; break; 414 case If::geq: l = lir_cond_greaterEqual; break; 415 case If::gtr: l = lir_cond_greater; break; 416 case If::aeq: l = lir_cond_aboveEqual; break; 417 case If::beq: l = lir_cond_belowEqual; break; 418 }; 419 return l; 420 } 421 422 #ifdef __SOFTFP__ 423 void do_soft_float_compare(If *x); 424 #endif // __SOFTFP__ 425 426 void init(); 427 428 SwitchRangeArray* create_lookup_ranges(TableSwitch* x); 429 SwitchRangeArray* create_lookup_ranges(LookupSwitch* x); 430 void do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux); 431 432 void do_RuntimeCall(address routine, int expected_arguments, Intrinsic* x); 433 #ifdef TRACE_HAVE_INTRINSICS 434 void do_ThreadIDIntrinsic(Intrinsic* x); 435 void do_ClassIDIntrinsic(Intrinsic* x); 436 #endif 437 438 public: 439 Compilation* compilation() const { return _compilation; } 440 FrameMap* frame_map() const { return _compilation->frame_map(); } 441 ciMethod* method() const { return _method; } 442 BlockBegin* block() const { return _block; } 443 IRScope* scope() const { return block()->scope(); } 444 445 int max_virtual_register_number() const { return _virtual_register_number; } 446 447 void block_do(BlockBegin* block); 448 449 // Flags that can be set on vregs 450 enum VregFlag { 451 must_start_in_memory = 0 // needs to be assigned a memory location at beginning, but may then be loaded in a register 452 , callee_saved = 1 // must be in a callee saved register 453 , byte_reg = 2 // must be in a byte register 454 , num_vreg_flags 455 456 }; 457 458 LIRGenerator(Compilation* compilation, ciMethod* method) 459 : _compilation(compilation) 460 , _method(method) 461 , _virtual_register_number(LIR_OprDesc::vreg_base) 462 , _vreg_flags(NULL, 0, num_vreg_flags) { 463 init(); 464 } 465 466 // for virtual registers, maps them back to Phi's or Local's 467 Instruction* instruction_for_opr(LIR_Opr opr); 468 Instruction* instruction_for_vreg(int reg_num); 469 470 void set_vreg_flag (int vreg_num, VregFlag f); 471 bool is_vreg_flag_set(int vreg_num, VregFlag f); 472 void set_vreg_flag (LIR_Opr opr, VregFlag f) { set_vreg_flag(opr->vreg_number(), f); } 473 bool is_vreg_flag_set(LIR_Opr opr, VregFlag f) { return is_vreg_flag_set(opr->vreg_number(), f); } 474 475 // statics 476 static LIR_Opr exceptionOopOpr(); 477 static LIR_Opr exceptionPcOpr(); 478 static LIR_Opr divInOpr(); 479 static LIR_Opr divOutOpr(); 480 static LIR_Opr remOutOpr(); 481 static LIR_Opr shiftCountOpr(); 482 LIR_Opr syncTempOpr(); 483 LIR_Opr atomicLockOpr(); 484 485 // returns a register suitable for saving the thread in a 486 // call_runtime_leaf if one is needed. 487 LIR_Opr getThreadTemp(); 488 489 // visitor functionality 490 virtual void do_Phi (Phi* x); 491 virtual void do_Local (Local* x); 492 virtual void do_Constant (Constant* x); 493 virtual void do_LoadField (LoadField* x); 494 virtual void do_StoreField (StoreField* x); 495 virtual void do_ArrayLength (ArrayLength* x); 496 virtual void do_LoadIndexed (LoadIndexed* x); 497 virtual void do_StoreIndexed (StoreIndexed* x); 498 virtual void do_NegateOp (NegateOp* x); 499 virtual void do_ArithmeticOp (ArithmeticOp* x); 500 virtual void do_ShiftOp (ShiftOp* x); 501 virtual void do_LogicOp (LogicOp* x); 502 virtual void do_CompareOp (CompareOp* x); 503 virtual void do_IfOp (IfOp* x); 504 virtual void do_Convert (Convert* x); 505 virtual void do_NullCheck (NullCheck* x); 506 virtual void do_TypeCast (TypeCast* x); 507 virtual void do_Invoke (Invoke* x); 508 virtual void do_NewInstance (NewInstance* x); 509 virtual void do_NewTypeArray (NewTypeArray* x); 510 virtual void do_NewObjectArray (NewObjectArray* x); 511 virtual void do_NewMultiArray (NewMultiArray* x); 512 virtual void do_CheckCast (CheckCast* x); 513 virtual void do_InstanceOf (InstanceOf* x); 514 virtual void do_MonitorEnter (MonitorEnter* x); 515 virtual void do_MonitorExit (MonitorExit* x); 516 virtual void do_Intrinsic (Intrinsic* x); 517 virtual void do_BlockBegin (BlockBegin* x); 518 virtual void do_Goto (Goto* x); 519 virtual void do_If (If* x); 520 virtual void do_IfInstanceOf (IfInstanceOf* x); 521 virtual void do_TableSwitch (TableSwitch* x); 522 virtual void do_LookupSwitch (LookupSwitch* x); 523 virtual void do_Return (Return* x); 524 virtual void do_Throw (Throw* x); 525 virtual void do_Base (Base* x); 526 virtual void do_OsrEntry (OsrEntry* x); 527 virtual void do_ExceptionObject(ExceptionObject* x); 528 virtual void do_RoundFP (RoundFP* x); 529 virtual void do_UnsafeGetRaw (UnsafeGetRaw* x); 530 virtual void do_UnsafePutRaw (UnsafePutRaw* x); 531 virtual void do_UnsafeGetObject(UnsafeGetObject* x); 532 virtual void do_UnsafePutObject(UnsafePutObject* x); 533 virtual void do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x); 534 virtual void do_UnsafePrefetchRead (UnsafePrefetchRead* x); 535 virtual void do_UnsafePrefetchWrite(UnsafePrefetchWrite* x); 536 virtual void do_ProfileCall (ProfileCall* x); 537 virtual void do_ProfileInvoke (ProfileInvoke* x); 538 virtual void do_RuntimeCall (RuntimeCall* x); 539 virtual void do_MemBar (MemBar* x); 540 virtual void do_RangeCheckPredicate(RangeCheckPredicate* x); 541 #ifdef ASSERT 542 virtual void do_Assert (Assert* x); 543 #endif 544 }; 545 546 547 class LIRItem: public CompilationResourceObj { 548 private: 549 Value _value; 550 LIRGenerator* _gen; 551 LIR_Opr _result; 552 bool _destroys_register; 553 LIR_Opr _new_result; 554 555 LIRGenerator* gen() const { return _gen; } 556 557 public: 558 LIRItem(Value value, LIRGenerator* gen) { 559 _destroys_register = false; 560 _gen = gen; 561 set_instruction(value); 562 } 563 564 LIRItem(LIRGenerator* gen) { 565 _destroys_register = false; 566 _gen = gen; 567 _result = LIR_OprFact::illegalOpr; 568 set_instruction(NULL); 569 } 570 571 void set_instruction(Value value) { 572 _value = value; 573 _result = LIR_OprFact::illegalOpr; 574 if (_value != NULL) { 575 _gen->walk(_value); 576 _result = _value->operand(); 577 } 578 _new_result = LIR_OprFact::illegalOpr; 579 } 580 581 Value value() const { return _value; } 582 ValueType* type() const { return value()->type(); } 583 LIR_Opr result() { 584 assert(!_destroys_register || (!_result->is_register() || _result->is_virtual()), 585 "shouldn't use set_destroys_register with physical regsiters"); 586 if (_destroys_register && _result->is_register()) { 587 if (_new_result->is_illegal()) { 588 _new_result = _gen->new_register(type()); 589 gen()->lir()->move(_result, _new_result); 590 } 591 return _new_result; 592 } else { 593 return _result; 594 } 595 return _result; 596 } 597 598 void set_result(LIR_Opr opr); 599 600 void load_item(); 601 void load_byte_item(); 602 void load_nonconstant(); 603 // load any values which can't be expressed as part of a single store instruction 604 void load_for_store(BasicType store_type); 605 void load_item_force(LIR_Opr reg); 606 607 void dont_load_item() { 608 // do nothing 609 } 610 611 void set_destroys_register() { 612 _destroys_register = true; 613 } 614 615 bool is_constant() const { return value()->as_Constant() != NULL; } 616 bool is_stack() { return result()->is_stack(); } 617 bool is_register() { return result()->is_register(); } 618 619 ciObject* get_jobject_constant() const; 620 jint get_jint_constant() const; 621 jlong get_jlong_constant() const; 622 jfloat get_jfloat_constant() const; 623 jdouble get_jdouble_constant() const; 624 jint get_address_constant() const; 625 }; 626 627 #endif // SHARE_VM_C1_C1_LIRGENERATOR_HPP