1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "opto/addnode.hpp" 27 #include "opto/callnode.hpp" 28 #include "opto/castnode.hpp" 29 #include "opto/connode.hpp" 30 #include "opto/matcher.hpp" 31 #include "opto/phaseX.hpp" 32 #include "opto/subnode.hpp" 33 #include "opto/type.hpp" 34 35 //============================================================================= 36 // If input is already higher or equal to cast type, then this is an identity. 37 Node* ConstraintCastNode::Identity(PhaseGVN* phase) { 38 Node* dom = dominating_cast(phase, phase); 39 if (dom != NULL) { 40 return dom; 41 } 42 if (_carry_dependency) { 43 return this; 44 } 45 return phase->type(in(1))->higher_equal_speculative(_type) ? in(1) : this; 46 } 47 48 //------------------------------Value------------------------------------------ 49 // Take 'join' of input and cast-up type 50 const Type* ConstraintCastNode::Value(PhaseGVN* phase) const { 51 if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; 52 const Type* ft = phase->type(in(1))->filter_speculative(_type); 53 54 #ifdef ASSERT 55 // Previous versions of this function had some special case logic, 56 // which is no longer necessary. Make sure of the required effects. 57 switch (Opcode()) { 58 case Op_CastII: 59 { 60 const Type* t1 = phase->type(in(1)); 61 if( t1 == Type::TOP ) assert(ft == Type::TOP, "special case #1"); 62 const Type* rt = t1->join_speculative(_type); 63 if (rt->empty()) assert(ft == Type::TOP, "special case #2"); 64 break; 65 } 66 case Op_CastPP: 67 if (phase->type(in(1)) == TypePtr::NULL_PTR && 68 _type->isa_ptr() && _type->is_ptr()->_ptr == TypePtr::NotNull) 69 assert(ft == Type::TOP, "special case #3"); 70 break; 71 } 72 #endif //ASSERT 73 74 return ft; 75 } 76 77 //------------------------------Ideal------------------------------------------ 78 // Return a node which is more "ideal" than the current node. Strip out 79 // control copies 80 Node *ConstraintCastNode::Ideal(PhaseGVN *phase, bool can_reshape) { 81 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; 82 } 83 84 bool ConstraintCastNode::cmp(const Node &n) const { 85 return TypeNode::cmp(n) && ((ConstraintCastNode&)n)._carry_dependency == _carry_dependency; 86 } 87 88 uint ConstraintCastNode::size_of() const { 89 return sizeof(*this); 90 } 91 92 Node* ConstraintCastNode::make_cast(int opcode, Node* c, Node *n, const Type *t, bool carry_dependency) { 93 switch(opcode) { 94 case Op_CastII: { 95 Node* cast = new CastIINode(n, t, carry_dependency); 96 cast->set_req(0, c); 97 return cast; 98 } 99 case Op_CastPP: { 100 Node* cast = new CastPPNode(n, t, carry_dependency); 101 cast->set_req(0, c); 102 return cast; 103 } 104 case Op_CheckCastPP: return new CheckCastPPNode(c, n, t, carry_dependency); 105 default: 106 fatal("Bad opcode %d", opcode); 107 } 108 return NULL; 109 } 110 111 TypeNode* ConstraintCastNode::dominating_cast(PhaseGVN* gvn, PhaseTransform* pt) const { 112 Node* val = in(1); 113 Node* ctl = in(0); 114 int opc = Opcode(); 115 if (ctl == NULL) { 116 return NULL; 117 } 118 // Range check CastIIs may all end up under a single range check and 119 // in that case only the narrower CastII would be kept by the code 120 // below which would be incorrect. 121 if (is_CastII() && as_CastII()->has_range_check()) { 122 return NULL; 123 } 124 if (type()->isa_rawptr() && (gvn->type_or_null(val) == NULL || gvn->type(val)->isa_oopptr())) { 125 return NULL; 126 } 127 for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) { 128 Node* u = val->fast_out(i); 129 if (u != this && 130 u->outcnt() > 0 && 131 u->Opcode() == opc && 132 u->in(0) != NULL && 133 u->bottom_type()->higher_equal(type())) { 134 if (pt->is_dominator(u->in(0), ctl)) { 135 return u->as_Type(); 136 } 137 if (is_CheckCastPP() && u->in(1)->is_Proj() && u->in(1)->in(0)->is_Allocate() && 138 u->in(0)->is_Proj() && u->in(0)->in(0)->is_Initialize() && 139 u->in(1)->in(0)->as_Allocate()->initialization() == u->in(0)->in(0)) { 140 // CheckCastPP following an allocation always dominates all 141 // use of the allocation result 142 return u->as_Type(); 143 } 144 } 145 } 146 return NULL; 147 } 148 149 #ifndef PRODUCT 150 void ConstraintCastNode::dump_spec(outputStream *st) const { 151 TypeNode::dump_spec(st); 152 if (_carry_dependency) { 153 st->print(" carry dependency"); 154 } 155 } 156 #endif 157 158 const Type* CastIINode::Value(PhaseGVN* phase) const { 159 const Type *res = ConstraintCastNode::Value(phase); 160 161 // Try to improve the type of the CastII if we recognize a CmpI/If 162 // pattern. 163 if (_carry_dependency) { 164 if (in(0) != NULL && in(0)->in(0) != NULL && in(0)->in(0)->is_If()) { 165 assert(in(0)->is_IfFalse() || in(0)->is_IfTrue(), "should be If proj"); 166 Node* proj = in(0); 167 if (proj->in(0)->in(1)->is_Bool()) { 168 Node* b = proj->in(0)->in(1); 169 if (b->in(1)->Opcode() == Op_CmpI) { 170 Node* cmp = b->in(1); 171 if (cmp->in(1) == in(1) && phase->type(cmp->in(2))->isa_int()) { 172 const TypeInt* in2_t = phase->type(cmp->in(2))->is_int(); 173 const Type* t = TypeInt::INT; 174 BoolTest test = b->as_Bool()->_test; 175 if (proj->is_IfFalse()) { 176 test = test.negate(); 177 } 178 BoolTest::mask m = test._test; 179 jlong lo_long = min_jint; 180 jlong hi_long = max_jint; 181 if (m == BoolTest::le || m == BoolTest::lt) { 182 hi_long = in2_t->_hi; 183 if (m == BoolTest::lt) { 184 hi_long -= 1; 185 } 186 } else if (m == BoolTest::ge || m == BoolTest::gt) { 187 lo_long = in2_t->_lo; 188 if (m == BoolTest::gt) { 189 lo_long += 1; 190 } 191 } else if (m == BoolTest::eq) { 192 lo_long = in2_t->_lo; 193 hi_long = in2_t->_hi; 194 } else if (m == BoolTest::ne) { 195 // can't do any better 196 } else { 197 stringStream ss; 198 test.dump_on(&ss); 199 fatal("unexpected comparison %s", ss.as_string()); 200 } 201 int lo_int = (int)lo_long; 202 int hi_int = (int)hi_long; 203 204 if (lo_long != (jlong)lo_int) { 205 lo_int = min_jint; 206 } 207 if (hi_long != (jlong)hi_int) { 208 hi_int = max_jint; 209 } 210 211 t = TypeInt::make(lo_int, hi_int, Type::WidenMax); 212 213 res = res->filter_speculative(t); 214 215 return res; 216 } 217 } 218 } 219 } 220 } 221 return res; 222 } 223 224 Node *CastIINode::Ideal(PhaseGVN *phase, bool can_reshape) { 225 Node* progress = ConstraintCastNode::Ideal(phase, can_reshape); 226 if (progress != NULL) { 227 return progress; 228 } 229 230 // Similar to ConvI2LNode::Ideal() for the same reasons 231 // Do not narrow the type of range check dependent CastIINodes to 232 // avoid corruption of the graph if a CastII is replaced by TOP but 233 // the corresponding range check is not removed. 234 if (can_reshape && !_range_check_dependency && !phase->C->major_progress()) { 235 const TypeInt* this_type = this->type()->is_int(); 236 const TypeInt* in_type = phase->type(in(1))->isa_int(); 237 if (in_type != NULL && this_type != NULL && 238 (in_type->_lo != this_type->_lo || 239 in_type->_hi != this_type->_hi)) { 240 jint lo1 = this_type->_lo; 241 jint hi1 = this_type->_hi; 242 int w1 = this_type->_widen; 243 244 if (lo1 >= 0) { 245 // Keep a range assertion of >=0. 246 lo1 = 0; hi1 = max_jint; 247 } else if (hi1 < 0) { 248 // Keep a range assertion of <0. 249 lo1 = min_jint; hi1 = -1; 250 } else { 251 lo1 = min_jint; hi1 = max_jint; 252 } 253 const TypeInt* wtype = TypeInt::make(MAX2(in_type->_lo, lo1), 254 MIN2(in_type->_hi, hi1), 255 MAX2((int)in_type->_widen, w1)); 256 if (wtype != type()) { 257 set_type(wtype); 258 return this; 259 } 260 } 261 } 262 return NULL; 263 } 264 265 bool CastIINode::cmp(const Node &n) const { 266 return ConstraintCastNode::cmp(n) && ((CastIINode&)n)._range_check_dependency == _range_check_dependency; 267 } 268 269 uint CastIINode::size_of() const { 270 return sizeof(*this); 271 } 272 273 #ifndef PRODUCT 274 void CastIINode::dump_spec(outputStream* st) const { 275 ConstraintCastNode::dump_spec(st); 276 if (_range_check_dependency) { 277 st->print(" range check dependency"); 278 } 279 } 280 #endif 281 282 //============================================================================= 283 //------------------------------Identity--------------------------------------- 284 // If input is already higher or equal to cast type, then this is an identity. 285 Node* CheckCastPPNode::Identity(PhaseGVN* phase) { 286 Node* dom = dominating_cast(phase, phase); 287 if (dom != NULL) { 288 return dom; 289 } 290 if (_carry_dependency) { 291 return this; 292 } 293 const Type* t = phase->type(in(1)); 294 if (EnableVectorReboxing && in(1)->Opcode() == Op_VectorBox) { 295 if (t->higher_equal_speculative(phase->type(this))) { 296 return in(1); 297 } 298 } else if (t == phase->type(this)) { 299 // Toned down to rescue meeting at a Phi 3 different oops all implementing 300 // the same interface. 301 return in(1); 302 } 303 return this; 304 } 305 306 //------------------------------Value------------------------------------------ 307 // Take 'join' of input and cast-up type, unless working with an Interface 308 const Type* CheckCastPPNode::Value(PhaseGVN* phase) const { 309 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; 310 311 const Type *inn = phase->type(in(1)); 312 if( inn == Type::TOP ) return Type::TOP; // No information yet 313 314 const TypePtr *in_type = inn->isa_ptr(); 315 const TypePtr *my_type = _type->isa_ptr(); 316 const Type *result = _type; 317 if( in_type != NULL && my_type != NULL ) { 318 TypePtr::PTR in_ptr = in_type->ptr(); 319 if (in_ptr == TypePtr::Null) { 320 result = in_type; 321 } else if (in_ptr == TypePtr::Constant) { 322 if (my_type->isa_rawptr()) { 323 result = my_type; 324 } else { 325 const TypeOopPtr *jptr = my_type->isa_oopptr(); 326 assert(jptr, ""); 327 result = !in_type->higher_equal(_type) 328 ? my_type->cast_to_ptr_type(TypePtr::NotNull) 329 : in_type; 330 } 331 } else { 332 result = my_type->cast_to_ptr_type( my_type->join_ptr(in_ptr) ); 333 } 334 } 335 336 // This is the code from TypePtr::xmeet() that prevents us from 337 // having 2 ways to represent the same type. We have to replicate it 338 // here because we don't go through meet/join. 339 if (result->remove_speculative() == result->speculative()) { 340 result = result->remove_speculative(); 341 } 342 343 // Same as above: because we don't go through meet/join, remove the 344 // speculative type if we know we won't use it. 345 return result->cleanup_speculative(); 346 347 // JOIN NOT DONE HERE BECAUSE OF INTERFACE ISSUES. 348 // FIX THIS (DO THE JOIN) WHEN UNION TYPES APPEAR! 349 350 // 351 // Remove this code after overnight run indicates no performance 352 // loss from not performing JOIN at CheckCastPPNode 353 // 354 // const TypeInstPtr *in_oop = in->isa_instptr(); 355 // const TypeInstPtr *my_oop = _type->isa_instptr(); 356 // // If either input is an 'interface', return destination type 357 // assert (in_oop == NULL || in_oop->klass() != NULL, ""); 358 // assert (my_oop == NULL || my_oop->klass() != NULL, ""); 359 // if( (in_oop && in_oop->klass()->is_interface()) 360 // ||(my_oop && my_oop->klass()->is_interface()) ) { 361 // TypePtr::PTR in_ptr = in->isa_ptr() ? in->is_ptr()->_ptr : TypePtr::BotPTR; 362 // // Preserve cast away nullness for interfaces 363 // if( in_ptr == TypePtr::NotNull && my_oop && my_oop->_ptr == TypePtr::BotPTR ) { 364 // return my_oop->cast_to_ptr_type(TypePtr::NotNull); 365 // } 366 // return _type; 367 // } 368 // 369 // // Neither the input nor the destination type is an interface, 370 // 371 // // history: JOIN used to cause weird corner case bugs 372 // // return (in == TypeOopPtr::NULL_PTR) ? in : _type; 373 // // JOIN picks up NotNull in common instance-of/check-cast idioms, both oops. 374 // // JOIN does not preserve NotNull in other cases, e.g. RawPtr vs InstPtr 375 // const Type *join = in->join(_type); 376 // // Check if join preserved NotNull'ness for pointers 377 // if( join->isa_ptr() && _type->isa_ptr() ) { 378 // TypePtr::PTR join_ptr = join->is_ptr()->_ptr; 379 // TypePtr::PTR type_ptr = _type->is_ptr()->_ptr; 380 // // If there isn't any NotNull'ness to preserve 381 // // OR if join preserved NotNull'ness then return it 382 // if( type_ptr == TypePtr::BotPTR || type_ptr == TypePtr::Null || 383 // join_ptr == TypePtr::NotNull || join_ptr == TypePtr::Constant ) { 384 // return join; 385 // } 386 // // ELSE return same old type as before 387 // return _type; 388 // } 389 // // Not joining two pointers 390 // return join; 391 } 392 393 //============================================================================= 394 //------------------------------Value------------------------------------------ 395 const Type* CastX2PNode::Value(PhaseGVN* phase) const { 396 const Type* t = phase->type(in(1)); 397 if (t == Type::TOP) return Type::TOP; 398 if (t->base() == Type_X && t->singleton()) { 399 uintptr_t bits = (uintptr_t) t->is_intptr_t()->get_con(); 400 if (bits == 0) return TypePtr::NULL_PTR; 401 return TypeRawPtr::make((address) bits); 402 } 403 return CastX2PNode::bottom_type(); 404 } 405 406 //------------------------------Idealize--------------------------------------- 407 static inline bool fits_in_int(const Type* t, bool but_not_min_int = false) { 408 if (t == Type::TOP) return false; 409 const TypeX* tl = t->is_intptr_t(); 410 jint lo = min_jint; 411 jint hi = max_jint; 412 if (but_not_min_int) ++lo; // caller wants to negate the value w/o overflow 413 return (tl->_lo >= lo) && (tl->_hi <= hi); 414 } 415 416 static inline Node* addP_of_X2P(PhaseGVN *phase, 417 Node* base, 418 Node* dispX, 419 bool negate = false) { 420 if (negate) { 421 dispX = phase->transform(new SubXNode(phase->MakeConX(0), dispX)); 422 } 423 return new AddPNode(phase->C->top(), 424 phase->transform(new CastX2PNode(base)), 425 dispX); 426 } 427 428 Node *CastX2PNode::Ideal(PhaseGVN *phase, bool can_reshape) { 429 // convert CastX2P(AddX(x, y)) to AddP(CastX2P(x), y) if y fits in an int 430 int op = in(1)->Opcode(); 431 Node* x; 432 Node* y; 433 switch (op) { 434 case Op_SubX: 435 x = in(1)->in(1); 436 // Avoid ideal transformations ping-pong between this and AddP for raw pointers. 437 if (phase->find_intptr_t_con(x, -1) == 0) 438 break; 439 y = in(1)->in(2); 440 if (fits_in_int(phase->type(y), true)) { 441 return addP_of_X2P(phase, x, y, true); 442 } 443 break; 444 case Op_AddX: 445 x = in(1)->in(1); 446 y = in(1)->in(2); 447 if (fits_in_int(phase->type(y))) { 448 return addP_of_X2P(phase, x, y); 449 } 450 if (fits_in_int(phase->type(x))) { 451 return addP_of_X2P(phase, y, x); 452 } 453 break; 454 } 455 return NULL; 456 } 457 458 //------------------------------Identity--------------------------------------- 459 Node* CastX2PNode::Identity(PhaseGVN* phase) { 460 if (in(1)->Opcode() == Op_CastP2X) return in(1)->in(1); 461 return this; 462 } 463 464 //============================================================================= 465 //------------------------------Value------------------------------------------ 466 const Type* CastP2XNode::Value(PhaseGVN* phase) const { 467 const Type* t = phase->type(in(1)); 468 if (t == Type::TOP) return Type::TOP; 469 if (t->base() == Type::RawPtr && t->singleton()) { 470 uintptr_t bits = (uintptr_t) t->is_rawptr()->get_con(); 471 return TypeX::make(bits); 472 } 473 return CastP2XNode::bottom_type(); 474 } 475 476 Node *CastP2XNode::Ideal(PhaseGVN *phase, bool can_reshape) { 477 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; 478 } 479 480 //------------------------------Identity--------------------------------------- 481 Node* CastP2XNode::Identity(PhaseGVN* phase) { 482 if (in(1)->Opcode() == Op_CastX2P) return in(1)->in(1); 483 return this; 484 }