1 /* 2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_C1_C1_CODESTUBS_HPP 26 #define SHARE_VM_C1_C1_CODESTUBS_HPP 27 28 #include "c1/c1_FrameMap.hpp" 29 #include "c1/c1_IR.hpp" 30 #include "c1/c1_Instruction.hpp" 31 #include "c1/c1_LIR.hpp" 32 #include "c1/c1_Runtime1.hpp" 33 #include "code/nativeInst.hpp" 34 #include "utilities/growableArray.hpp" 35 #include "utilities/macros.hpp" 36 37 class CodeEmitInfo; 38 class LIR_Assembler; 39 class LIR_OpVisitState; 40 41 // CodeStubs are little 'out-of-line' pieces of code that 42 // usually handle slow cases of operations. All code stubs 43 // are collected and code is emitted at the end of the 44 // nmethod. 45 46 class CodeStub: public CompilationResourceObj { 47 protected: 48 Label _entry; // label at the stub entry point 49 Label _continuation; // label where stub continues, if any 50 51 public: 52 CodeStub() {} 53 54 // code generation 55 void assert_no_unbound_labels() { assert(!_entry.is_unbound() && !_continuation.is_unbound(), "unbound label"); } 56 virtual void emit_code(LIR_Assembler* e) = 0; 57 virtual CodeEmitInfo* info() const { return NULL; } 58 virtual bool is_exception_throw_stub() const { return false; } 59 virtual bool is_range_check_stub() const { return false; } 60 virtual bool is_divbyzero_stub() const { return false; } 61 virtual bool is_simple_exception_stub() const { return false; } 62 #ifndef PRODUCT 63 virtual void print_name(outputStream* out) const = 0; 64 #endif 65 66 // label access 67 Label* entry() { return &_entry; } 68 Label* continuation() { return &_continuation; } 69 // for LIR 70 virtual void visit(LIR_OpVisitState* visit) { 71 #ifndef PRODUCT 72 if (LIRTracePeephole && Verbose) { 73 tty->print("no visitor for "); 74 print_name(tty); 75 tty->cr(); 76 } 77 #endif 78 } 79 }; 80 81 class CodeStubList: public GrowableArray<CodeStub*> { 82 public: 83 CodeStubList(): GrowableArray<CodeStub*>() {} 84 85 void append(CodeStub* stub) { 86 if (!contains(stub)) { 87 GrowableArray<CodeStub*>::append(stub); 88 } 89 } 90 }; 91 92 class CounterOverflowStub: public CodeStub { 93 private: 94 CodeEmitInfo* _info; 95 int _bci; 96 LIR_Opr _method; 97 98 public: 99 CounterOverflowStub(CodeEmitInfo* info, int bci, LIR_Opr method) : _info(info), _bci(bci), _method(method) { 100 } 101 102 virtual void emit_code(LIR_Assembler* e); 103 104 virtual void visit(LIR_OpVisitState* visitor) { 105 visitor->do_slow_case(_info); 106 visitor->do_input(_method); 107 } 108 109 #ifndef PRODUCT 110 virtual void print_name(outputStream* out) const { out->print("CounterOverflowStub"); } 111 #endif // PRODUCT 112 113 }; 114 115 class ConversionStub: public CodeStub { 116 private: 117 Bytecodes::Code _bytecode; 118 LIR_Opr _input; 119 LIR_Opr _result; 120 121 static float float_zero; 122 static double double_zero; 123 public: 124 ConversionStub(Bytecodes::Code bytecode, LIR_Opr input, LIR_Opr result) 125 : _bytecode(bytecode), _input(input), _result(result) { 126 } 127 128 Bytecodes::Code bytecode() { return _bytecode; } 129 LIR_Opr input() { return _input; } 130 LIR_Opr result() { return _result; } 131 132 virtual void emit_code(LIR_Assembler* e); 133 virtual void visit(LIR_OpVisitState* visitor) { 134 visitor->do_slow_case(); 135 visitor->do_input(_input); 136 visitor->do_output(_result); 137 } 138 #ifndef PRODUCT 139 virtual void print_name(outputStream* out) const { out->print("ConversionStub"); } 140 #endif // PRODUCT 141 }; 142 143 144 // Throws ArrayIndexOutOfBoundsException by default but can be 145 // configured to throw IndexOutOfBoundsException in constructor 146 class RangeCheckStub: public CodeStub { 147 private: 148 CodeEmitInfo* _info; 149 LIR_Opr _index; 150 LIR_Opr _array; 151 bool _throw_index_out_of_bounds_exception; 152 153 public: 154 // For ArrayIndexOutOfBoundsException. 155 RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, LIR_Opr array); 156 // For IndexOutOfBoundsException. 157 RangeCheckStub(CodeEmitInfo* info, LIR_Opr index); 158 virtual void emit_code(LIR_Assembler* e); 159 virtual CodeEmitInfo* info() const { return _info; } 160 virtual bool is_exception_throw_stub() const { return true; } 161 virtual bool is_range_check_stub() const { return true; } 162 virtual void visit(LIR_OpVisitState* visitor) { 163 visitor->do_slow_case(_info); 164 visitor->do_input(_index); 165 if (_array) { visitor->do_input(_array); } 166 } 167 #ifndef PRODUCT 168 virtual void print_name(outputStream* out) const { out->print("RangeCheckStub"); } 169 #endif // PRODUCT 170 }; 171 172 // stub used when predicate fails and deoptimization is needed 173 class PredicateFailedStub: public CodeStub { 174 private: 175 CodeEmitInfo* _info; 176 177 public: 178 PredicateFailedStub(CodeEmitInfo* info); 179 virtual void emit_code(LIR_Assembler* e); 180 virtual CodeEmitInfo* info() const { return _info; } 181 virtual void visit(LIR_OpVisitState* visitor) { 182 visitor->do_slow_case(_info); 183 } 184 #ifndef PRODUCT 185 virtual void print_name(outputStream* out) const { out->print("PredicateFailedStub"); } 186 #endif // PRODUCT 187 }; 188 189 class DivByZeroStub: public CodeStub { 190 private: 191 CodeEmitInfo* _info; 192 int _offset; 193 194 public: 195 DivByZeroStub(CodeEmitInfo* info) 196 : _info(info), _offset(-1) { 197 } 198 DivByZeroStub(int offset, CodeEmitInfo* info) 199 : _info(info), _offset(offset) { 200 } 201 virtual void emit_code(LIR_Assembler* e); 202 virtual CodeEmitInfo* info() const { return _info; } 203 virtual bool is_exception_throw_stub() const { return true; } 204 virtual bool is_divbyzero_stub() const { return true; } 205 virtual void visit(LIR_OpVisitState* visitor) { 206 visitor->do_slow_case(_info); 207 } 208 #ifndef PRODUCT 209 virtual void print_name(outputStream* out) const { out->print("DivByZeroStub"); } 210 #endif // PRODUCT 211 }; 212 213 214 class ImplicitNullCheckStub: public CodeStub { 215 private: 216 CodeEmitInfo* _info; 217 int _offset; 218 219 public: 220 ImplicitNullCheckStub(int offset, CodeEmitInfo* info) 221 : _info(info), _offset(offset) { 222 } 223 virtual void emit_code(LIR_Assembler* e); 224 virtual CodeEmitInfo* info() const { return _info; } 225 virtual bool is_exception_throw_stub() const { return true; } 226 virtual void visit(LIR_OpVisitState* visitor) { 227 visitor->do_slow_case(_info); 228 } 229 #ifndef PRODUCT 230 virtual void print_name(outputStream* out) const { out->print("ImplicitNullCheckStub"); } 231 #endif // PRODUCT 232 }; 233 234 235 class NewInstanceStub: public CodeStub { 236 private: 237 ciInstanceKlass* _klass; 238 LIR_Opr _klass_reg; 239 LIR_Opr _result; 240 CodeEmitInfo* _info; 241 Runtime1::StubID _stub_id; 242 243 public: 244 NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id); 245 virtual void emit_code(LIR_Assembler* e); 246 virtual CodeEmitInfo* info() const { return _info; } 247 virtual void visit(LIR_OpVisitState* visitor) { 248 visitor->do_slow_case(_info); 249 visitor->do_input(_klass_reg); 250 visitor->do_output(_result); 251 } 252 #ifndef PRODUCT 253 virtual void print_name(outputStream* out) const { out->print("NewInstanceStub"); } 254 #endif // PRODUCT 255 }; 256 257 258 class NewTypeArrayStub: public CodeStub { 259 private: 260 LIR_Opr _klass_reg; 261 LIR_Opr _length; 262 LIR_Opr _result; 263 CodeEmitInfo* _info; 264 265 public: 266 NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info); 267 virtual void emit_code(LIR_Assembler* e); 268 virtual CodeEmitInfo* info() const { return _info; } 269 virtual void visit(LIR_OpVisitState* visitor) { 270 visitor->do_slow_case(_info); 271 visitor->do_input(_klass_reg); 272 visitor->do_input(_length); 273 assert(_result->is_valid(), "must be valid"); visitor->do_output(_result); 274 } 275 #ifndef PRODUCT 276 virtual void print_name(outputStream* out) const { out->print("NewTypeArrayStub"); } 277 #endif // PRODUCT 278 }; 279 280 281 class NewObjectArrayStub: public CodeStub { 282 private: 283 LIR_Opr _klass_reg; 284 LIR_Opr _length; 285 LIR_Opr _result; 286 CodeEmitInfo* _info; 287 288 public: 289 NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info); 290 virtual void emit_code(LIR_Assembler* e); 291 virtual CodeEmitInfo* info() const { return _info; } 292 virtual void visit(LIR_OpVisitState* visitor) { 293 visitor->do_slow_case(_info); 294 visitor->do_input(_klass_reg); 295 visitor->do_input(_length); 296 assert(_result->is_valid(), "must be valid"); visitor->do_output(_result); 297 } 298 #ifndef PRODUCT 299 virtual void print_name(outputStream* out) const { out->print("NewObjectArrayStub"); } 300 #endif // PRODUCT 301 }; 302 303 304 class MonitorAccessStub: public CodeStub { 305 protected: 306 LIR_Opr _obj_reg; 307 LIR_Opr _lock_reg; 308 309 public: 310 MonitorAccessStub(LIR_Opr obj_reg, LIR_Opr lock_reg) { 311 _obj_reg = obj_reg; 312 _lock_reg = lock_reg; 313 } 314 315 #ifndef PRODUCT 316 virtual void print_name(outputStream* out) const { out->print("MonitorAccessStub"); } 317 #endif // PRODUCT 318 }; 319 320 321 class MonitorEnterStub: public MonitorAccessStub { 322 private: 323 CodeEmitInfo* _info; 324 325 public: 326 MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info); 327 328 virtual void emit_code(LIR_Assembler* e); 329 virtual CodeEmitInfo* info() const { return _info; } 330 virtual void visit(LIR_OpVisitState* visitor) { 331 visitor->do_input(_obj_reg); 332 visitor->do_input(_lock_reg); 333 visitor->do_slow_case(_info); 334 } 335 #ifndef PRODUCT 336 virtual void print_name(outputStream* out) const { out->print("MonitorEnterStub"); } 337 #endif // PRODUCT 338 }; 339 340 341 class MonitorExitStub: public MonitorAccessStub { 342 private: 343 bool _compute_lock; 344 int _monitor_ix; 345 346 public: 347 MonitorExitStub(LIR_Opr lock_reg, bool compute_lock, int monitor_ix) 348 : MonitorAccessStub(LIR_OprFact::illegalOpr, lock_reg), 349 _compute_lock(compute_lock), _monitor_ix(monitor_ix) { } 350 virtual void emit_code(LIR_Assembler* e); 351 virtual void visit(LIR_OpVisitState* visitor) { 352 assert(_obj_reg->is_illegal(), "unused"); 353 if (_compute_lock) { 354 visitor->do_temp(_lock_reg); 355 } else { 356 visitor->do_input(_lock_reg); 357 } 358 } 359 #ifndef PRODUCT 360 virtual void print_name(outputStream* out) const { out->print("MonitorExitStub"); } 361 #endif // PRODUCT 362 }; 363 364 365 class PatchingStub: public CodeStub { 366 public: 367 enum PatchID { 368 access_field_id, 369 load_klass_id, 370 load_mirror_id, 371 load_appendix_id 372 }; 373 enum constants { 374 patch_info_size = 3 375 }; 376 private: 377 PatchID _id; 378 address _pc_start; 379 int _bytes_to_copy; 380 Label _patched_code_entry; 381 Label _patch_site_entry; 382 Label _patch_site_continuation; 383 Register _obj; 384 CodeEmitInfo* _info; 385 int _index; // index of the patchable oop or Klass* in nmethod oop or metadata table if needed 386 static int _patch_info_offset; 387 388 void align_patch_site(MacroAssembler* masm); 389 390 public: 391 static int patch_info_offset() { return _patch_info_offset; } 392 393 PatchingStub(MacroAssembler* masm, PatchID id, int index = -1): 394 _id(id) 395 , _info(NULL) 396 , _index(index) { 397 if (os::is_MP()) { 398 // force alignment of patch sites on MP hardware so we 399 // can guarantee atomic writes to the patch site. 400 align_patch_site(masm); 401 } 402 _pc_start = masm->pc(); 403 masm->bind(_patch_site_entry); 404 } 405 406 void install(MacroAssembler* masm, LIR_PatchCode patch_code, Register obj, CodeEmitInfo* info) { 407 _info = info; 408 _obj = obj; 409 masm->bind(_patch_site_continuation); 410 _bytes_to_copy = masm->pc() - pc_start(); 411 if (_id == PatchingStub::access_field_id) { 412 // embed a fixed offset to handle long patches which need to be offset by a word. 413 // the patching code will just add the field offset field to this offset so 414 // that we can refernce either the high or low word of a double word field. 415 int field_offset = 0; 416 switch (patch_code) { 417 case lir_patch_low: field_offset = lo_word_offset_in_bytes; break; 418 case lir_patch_high: field_offset = hi_word_offset_in_bytes; break; 419 case lir_patch_normal: field_offset = 0; break; 420 default: ShouldNotReachHere(); 421 } 422 NativeMovRegMem* n_move = nativeMovRegMem_at(pc_start()); 423 n_move->set_offset(field_offset); 424 } else if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) { 425 assert(_obj != noreg, "must have register object for load_klass/load_mirror"); 426 #ifdef ASSERT 427 // verify that we're pointing at a NativeMovConstReg 428 nativeMovConstReg_at(pc_start()); 429 #endif 430 } else { 431 ShouldNotReachHere(); 432 } 433 assert(_bytes_to_copy <= (masm->pc() - pc_start()), "not enough bytes"); 434 } 435 436 address pc_start() const { return _pc_start; } 437 PatchID id() const { return _id; } 438 439 virtual void emit_code(LIR_Assembler* e); 440 virtual CodeEmitInfo* info() const { return _info; } 441 virtual void visit(LIR_OpVisitState* visitor) { 442 visitor->do_slow_case(_info); 443 } 444 #ifndef PRODUCT 445 virtual void print_name(outputStream* out) const { out->print("PatchingStub"); } 446 #endif // PRODUCT 447 }; 448 449 450 //------------------------------------------------------------------------------ 451 // DeoptimizeStub 452 // 453 class DeoptimizeStub : public CodeStub { 454 private: 455 CodeEmitInfo* _info; 456 jint _trap_request; 457 458 public: 459 DeoptimizeStub(CodeEmitInfo* info, Deoptimization::DeoptReason reason, Deoptimization::DeoptAction action) : 460 _info(new CodeEmitInfo(info)), _trap_request(Deoptimization::make_trap_request(reason, action)) {} 461 462 virtual void emit_code(LIR_Assembler* e); 463 virtual CodeEmitInfo* info() const { return _info; } 464 virtual bool is_exception_throw_stub() const { return true; } 465 virtual void visit(LIR_OpVisitState* visitor) { 466 visitor->do_slow_case(_info); 467 } 468 #ifndef PRODUCT 469 virtual void print_name(outputStream* out) const { out->print("DeoptimizeStub"); } 470 #endif // PRODUCT 471 }; 472 473 474 class SimpleExceptionStub: public CodeStub { 475 private: 476 LIR_Opr _obj; 477 Runtime1::StubID _stub; 478 CodeEmitInfo* _info; 479 480 public: 481 SimpleExceptionStub(Runtime1::StubID stub, LIR_Opr obj, CodeEmitInfo* info): 482 _obj(obj), _stub(stub), _info(info) { 483 } 484 485 void set_obj(LIR_Opr obj) { 486 _obj = obj; 487 } 488 489 virtual void emit_code(LIR_Assembler* e); 490 virtual CodeEmitInfo* info() const { return _info; } 491 virtual bool is_exception_throw_stub() const { return true; } 492 virtual bool is_simple_exception_stub() const { return true; } 493 virtual void visit(LIR_OpVisitState* visitor) { 494 if (_obj->is_valid()) visitor->do_input(_obj); 495 visitor->do_slow_case(_info); 496 } 497 #ifndef PRODUCT 498 virtual void print_name(outputStream* out) const { out->print("SimpleExceptionStub"); } 499 #endif // PRODUCT 500 }; 501 502 503 504 class ArrayStoreExceptionStub: public SimpleExceptionStub { 505 private: 506 CodeEmitInfo* _info; 507 508 public: 509 ArrayStoreExceptionStub(LIR_Opr obj, CodeEmitInfo* info): SimpleExceptionStub(Runtime1::throw_array_store_exception_id, obj, info) {} 510 #ifndef PRODUCT 511 virtual void print_name(outputStream* out) const { out->print("ArrayStoreExceptionStub"); } 512 #endif // PRODUCT 513 }; 514 515 516 class ArrayCopyStub: public CodeStub { 517 private: 518 LIR_OpArrayCopy* _op; 519 520 public: 521 ArrayCopyStub(LIR_OpArrayCopy* op): _op(op) { } 522 523 LIR_Opr src() const { return _op->src(); } 524 LIR_Opr src_pos() const { return _op->src_pos(); } 525 LIR_Opr dst() const { return _op->dst(); } 526 LIR_Opr dst_pos() const { return _op->dst_pos(); } 527 LIR_Opr length() const { return _op->length(); } 528 LIR_Opr tmp() const { return _op->tmp(); } 529 530 virtual void emit_code(LIR_Assembler* e); 531 virtual CodeEmitInfo* info() const { return _op->info(); } 532 virtual void visit(LIR_OpVisitState* visitor) { 533 // don't pass in the code emit info since it's processed in the fast path 534 visitor->do_slow_case(); 535 } 536 #ifndef PRODUCT 537 virtual void print_name(outputStream* out) const { out->print("ArrayCopyStub"); } 538 #endif // PRODUCT 539 }; 540 541 #endif // SHARE_VM_C1_C1_CODESTUBS_HPP