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(PhaseTransform *phase) { 38 Node* dom = dominating_cast(phase); 39 if (dom != NULL) { 40 assert(_carry_dependency, "only for casts that carry a dependency"); 41 return dom; 42 } 43 if (_carry_dependency) { 44 return this; 45 } 46 return phase->type(in(1))->higher_equal_speculative(_type) ? in(1) : this; 47 } 48 49 //------------------------------Value------------------------------------------ 50 // Take 'join' of input and cast-up type 51 const Type *ConstraintCastNode::Value(PhaseTransform *phase) const { 52 if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; 53 const Type* ft = phase->type(in(1))->filter_speculative(_type); 54 55 #ifdef ASSERT 56 // Previous versions of this function had some special case logic, 57 // which is no longer necessary. Make sure of the required effects. 58 switch (Opcode()) { 59 case Op_CastII: 60 { 61 const Type* t1 = phase->type(in(1)); 62 if( t1 == Type::TOP ) assert(ft == Type::TOP, "special case #1"); 63 const Type* rt = t1->join_speculative(_type); 64 if (rt->empty()) assert(ft == Type::TOP, "special case #2"); 65 break; 66 } 67 case Op_CastPP: 68 if (phase->type(in(1)) == TypePtr::NULL_PTR && 69 _type->isa_ptr() && _type->is_ptr()->_ptr == TypePtr::NotNull) 70 assert(ft == Type::TOP, "special case #3"); 71 break; 72 } 73 #endif //ASSERT 74 75 return ft; 76 } 77 78 //------------------------------Ideal------------------------------------------ 79 // Return a node which is more "ideal" than the current node. Strip out 80 // control copies 81 Node *ConstraintCastNode::Ideal(PhaseGVN *phase, bool can_reshape) { 82 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; 83 } 84 85 uint ConstraintCastNode::cmp(const Node &n) const { 86 return TypeNode::cmp(n) && ((ConstraintCastNode&)n)._carry_dependency == _carry_dependency; 87 } 88 89 uint ConstraintCastNode::size_of() const { 90 return sizeof(*this); 91 } 92 93 Node* ConstraintCastNode::make_cast(int opcode, Node* c, Node *n, const Type *t, bool carry_dependency) { 94 switch(opcode) { 95 case Op_CastII: { 96 Node* cast = new CastIINode(n, t, carry_dependency); 97 cast->set_req(0, c); 98 return cast; 99 } 100 case Op_CastPP: { 101 Node* cast = new CastPPNode(n, t, carry_dependency); 102 cast->set_req(0, c); 103 return cast; 104 } 105 case Op_CheckCastPP: return new CheckCastPPNode(c, n, t, carry_dependency); 106 default: 107 fatal("Bad opcode %d", opcode); 108 } 109 return NULL; 110 } 111 112 TypeNode* ConstraintCastNode::dominating_cast(PhaseTransform *phase) const { 113 if (!carry_dependency()) { 114 return NULL; 115 } 116 Node* val = in(1); 117 Node* ctl = in(0); 118 int opc = Opcode(); 119 if (ctl == NULL) { 120 return NULL; 121 } 122 for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) { 123 Node* u = val->fast_out(i); 124 if (u != this && 125 u->Opcode() == opc && 126 u->in(0) != NULL && 127 u->bottom_type()->higher_equal(type())) { 128 if (phase->is_dominator(u->in(0), ctl)) { 129 return u->as_Type(); 130 } 131 if (is_CheckCastPP() && u->in(1)->is_Proj() && u->in(1)->in(0)->is_Allocate() && 132 u->in(0)->is_Proj() && u->in(0)->in(0)->is_Initialize() && 133 u->in(1)->in(0)->as_Allocate()->initialization() == u->in(0)->in(0)) { 134 // CheckCastPP following an allocation always dominates all 135 // use of the allocation result 136 return u->as_Type(); 137 } 138 } 139 } 140 return NULL; 141 } 142 143 #ifndef PRODUCT 144 void ConstraintCastNode::dump_spec(outputStream *st) const { 145 TypeNode::dump_spec(st); 146 if (_carry_dependency) { 147 st->print(" carry dependency"); 148 } 149 } 150 #endif 151 152 const Type *CastIINode::Value(PhaseTransform *phase) const { 153 const Type *res = ConstraintCastNode::Value(phase); 154 155 // Try to improve the type of the CastII if we recognize a CmpI/If 156 // pattern. 157 if (_carry_dependency) { 158 if (in(0) != NULL && in(0)->in(0) != NULL && in(0)->in(0)->is_If()) { 159 assert(in(0)->is_IfFalse() || in(0)->is_IfTrue(), "should be If proj"); 160 Node* proj = in(0); 161 if (proj->in(0)->in(1)->is_Bool()) { 162 Node* b = proj->in(0)->in(1); 163 if (b->in(1)->Opcode() == Op_CmpI) { 164 Node* cmp = b->in(1); 165 if (cmp->in(1) == in(1) && phase->type(cmp->in(2))->isa_int()) { 166 const TypeInt* in2_t = phase->type(cmp->in(2))->is_int(); 167 const Type* t = TypeInt::INT; 168 BoolTest test = b->as_Bool()->_test; 169 if (proj->is_IfFalse()) { 170 test = test.negate(); 171 } 172 BoolTest::mask m = test._test; 173 jlong lo_long = min_jint; 174 jlong hi_long = max_jint; 175 if (m == BoolTest::le || m == BoolTest::lt) { 176 hi_long = in2_t->_hi; 177 if (m == BoolTest::lt) { 178 hi_long -= 1; 179 } 180 } else if (m == BoolTest::ge || m == BoolTest::gt) { 181 lo_long = in2_t->_lo; 182 if (m == BoolTest::gt) { 183 lo_long += 1; 184 } 185 } else if (m == BoolTest::eq) { 186 lo_long = in2_t->_lo; 187 hi_long = in2_t->_hi; 188 } else if (m == BoolTest::ne) { 189 // can't do any better 190 } else { 191 stringStream ss; 192 test.dump_on(&ss); 193 fatal("unexpected comparison %s", ss.as_string()); 194 } 195 int lo_int = (int)lo_long; 196 int hi_int = (int)hi_long; 197 198 if (lo_long != (jlong)lo_int) { 199 lo_int = min_jint; 200 } 201 if (hi_long != (jlong)hi_int) { 202 hi_int = max_jint; 203 } 204 205 t = TypeInt::make(lo_int, hi_int, Type::WidenMax); 206 207 res = res->filter_speculative(t); 208 209 return res; 210 } 211 } 212 } 213 } 214 } 215 return res; 216 } 217 218 Node *CastIINode::Ideal(PhaseGVN *phase, bool can_reshape) { 219 // transform: 220 // (CastII (AddI x const)) -> (AddI (CastII x) const) 221 // So the AddI has a chance to be optimized out 222 if (in(1)->Opcode() == Op_AddI) { 223 Node* in2 = in(1)->in(2); 224 const TypeInt* in2_t = phase->type(in2)->isa_int(); 225 if (in2_t != NULL && in2_t->singleton()) { 226 int in2_const = in2_t->_lo; 227 const TypeInt* current_type = _type->is_int(); 228 jlong new_lo_long = ((jlong)current_type->_lo) - in2_const; 229 jlong new_hi_long = ((jlong)current_type->_hi) - in2_const; 230 int new_lo = (int)new_lo_long; 231 int new_hi = (int)new_hi_long; 232 if (((jlong)new_lo) == new_lo_long && ((jlong)new_hi) == new_hi_long) { 233 Node* in1 = in(1)->in(1); 234 CastIINode* new_cast = (CastIINode*)clone(); 235 AddINode* new_add = (AddINode*)in(1)->clone(); 236 new_cast->set_type(TypeInt::make(new_lo, new_hi, current_type->_widen)); 237 new_cast->set_req(1, in1); 238 new_add->set_req(1, phase->transform(new_cast)); 239 return new_add; 240 } 241 } 242 } 243 // Similar to ConvI2LNode::Ideal() for the same reasons 244 if (can_reshape && !phase->C->major_progress()) { 245 const TypeInt* this_type = this->type()->is_int(); 246 const TypeInt* in_type = phase->type(in(1))->isa_int(); 247 if (in_type != NULL && this_type != NULL && 248 (in_type->_lo != this_type->_lo || 249 in_type->_hi != this_type->_hi)) { 250 int lo1 = this_type->_lo; 251 int hi1 = this_type->_hi; 252 int w1 = this_type->_widen; 253 254 if (lo1 >= 0) { 255 // Keep a range assertion of >=0. 256 lo1 = 0; hi1 = max_jint; 257 } else if (hi1 < 0) { 258 // Keep a range assertion of <0. 259 lo1 = min_jint; hi1 = -1; 260 } else { 261 lo1 = min_jint; hi1 = max_jint; 262 } 263 const TypeInt* wtype = TypeInt::make(MAX2(in_type->_lo, lo1), 264 MIN2(in_type->_hi, hi1), 265 MAX2((int)in_type->_widen, w1)); 266 if (wtype != type()) { 267 set_type(wtype); 268 return this; 269 } 270 } 271 } 272 return NULL; 273 } 274 275 //============================================================================= 276 //------------------------------Identity--------------------------------------- 277 // If input is already higher or equal to cast type, then this is an identity. 278 Node *CheckCastPPNode::Identity( PhaseTransform *phase ) { 279 Node* dom = dominating_cast(phase); 280 if (dom != NULL) { 281 assert(_carry_dependency, "only for casts that carry a dependency"); 282 return dom; 283 } 284 if (_carry_dependency) { 285 return this; 286 } 287 // Toned down to rescue meeting at a Phi 3 different oops all implementing 288 // the same interface. CompileTheWorld starting at 502, kd12rc1.zip. 289 return (phase->type(in(1)) == phase->type(this)) ? in(1) : this; 290 } 291 292 //------------------------------Value------------------------------------------ 293 // Take 'join' of input and cast-up type, unless working with an Interface 294 const Type *CheckCastPPNode::Value( PhaseTransform *phase ) const { 295 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; 296 297 const Type *inn = phase->type(in(1)); 298 if( inn == Type::TOP ) return Type::TOP; // No information yet 299 300 const TypePtr *in_type = inn->isa_ptr(); 301 const TypePtr *my_type = _type->isa_ptr(); 302 const Type *result = _type; 303 if( in_type != NULL && my_type != NULL ) { 304 TypePtr::PTR in_ptr = in_type->ptr(); 305 if (in_ptr == TypePtr::Null) { 306 result = in_type; 307 } else if (in_ptr == TypePtr::Constant) { 308 const TypeOopPtr *jptr = my_type->isa_oopptr(); 309 assert(jptr, ""); 310 result = !in_type->higher_equal(_type) 311 ? my_type->cast_to_ptr_type(TypePtr::NotNull) 312 : in_type; 313 } else { 314 result = my_type->cast_to_ptr_type( my_type->join_ptr(in_ptr) ); 315 } 316 } 317 318 // This is the code from TypePtr::xmeet() that prevents us from 319 // having 2 ways to represent the same type. We have to replicate it 320 // here because we don't go through meet/join. 321 if (result->remove_speculative() == result->speculative()) { 322 result = result->remove_speculative(); 323 } 324 325 // Same as above: because we don't go through meet/join, remove the 326 // speculative type if we know we won't use it. 327 return result->cleanup_speculative(); 328 329 // JOIN NOT DONE HERE BECAUSE OF INTERFACE ISSUES. 330 // FIX THIS (DO THE JOIN) WHEN UNION TYPES APPEAR! 331 332 // 333 // Remove this code after overnight run indicates no performance 334 // loss from not performing JOIN at CheckCastPPNode 335 // 336 // const TypeInstPtr *in_oop = in->isa_instptr(); 337 // const TypeInstPtr *my_oop = _type->isa_instptr(); 338 // // If either input is an 'interface', return destination type 339 // assert (in_oop == NULL || in_oop->klass() != NULL, ""); 340 // assert (my_oop == NULL || my_oop->klass() != NULL, ""); 341 // if( (in_oop && in_oop->klass()->is_interface()) 342 // ||(my_oop && my_oop->klass()->is_interface()) ) { 343 // TypePtr::PTR in_ptr = in->isa_ptr() ? in->is_ptr()->_ptr : TypePtr::BotPTR; 344 // // Preserve cast away nullness for interfaces 345 // if( in_ptr == TypePtr::NotNull && my_oop && my_oop->_ptr == TypePtr::BotPTR ) { 346 // return my_oop->cast_to_ptr_type(TypePtr::NotNull); 347 // } 348 // return _type; 349 // } 350 // 351 // // Neither the input nor the destination type is an interface, 352 // 353 // // history: JOIN used to cause weird corner case bugs 354 // // return (in == TypeOopPtr::NULL_PTR) ? in : _type; 355 // // JOIN picks up NotNull in common instance-of/check-cast idioms, both oops. 356 // // JOIN does not preserve NotNull in other cases, e.g. RawPtr vs InstPtr 357 // const Type *join = in->join(_type); 358 // // Check if join preserved NotNull'ness for pointers 359 // if( join->isa_ptr() && _type->isa_ptr() ) { 360 // TypePtr::PTR join_ptr = join->is_ptr()->_ptr; 361 // TypePtr::PTR type_ptr = _type->is_ptr()->_ptr; 362 // // If there isn't any NotNull'ness to preserve 363 // // OR if join preserved NotNull'ness then return it 364 // if( type_ptr == TypePtr::BotPTR || type_ptr == TypePtr::Null || 365 // join_ptr == TypePtr::NotNull || join_ptr == TypePtr::Constant ) { 366 // return join; 367 // } 368 // // ELSE return same old type as before 369 // return _type; 370 // } 371 // // Not joining two pointers 372 // return join; 373 } 374 375 //============================================================================= 376 //------------------------------Value------------------------------------------ 377 const Type *CastX2PNode::Value( PhaseTransform *phase ) const { 378 const Type* t = phase->type(in(1)); 379 if (t == Type::TOP) return Type::TOP; 380 if (t->base() == Type_X && t->singleton()) { 381 uintptr_t bits = (uintptr_t) t->is_intptr_t()->get_con(); 382 if (bits == 0) return TypePtr::NULL_PTR; 383 return TypeRawPtr::make((address) bits); 384 } 385 return CastX2PNode::bottom_type(); 386 } 387 388 //------------------------------Idealize--------------------------------------- 389 static inline bool fits_in_int(const Type* t, bool but_not_min_int = false) { 390 if (t == Type::TOP) return false; 391 const TypeX* tl = t->is_intptr_t(); 392 jint lo = min_jint; 393 jint hi = max_jint; 394 if (but_not_min_int) ++lo; // caller wants to negate the value w/o overflow 395 return (tl->_lo >= lo) && (tl->_hi <= hi); 396 } 397 398 static inline Node* addP_of_X2P(PhaseGVN *phase, 399 Node* base, 400 Node* dispX, 401 bool negate = false) { 402 if (negate) { 403 dispX = new SubXNode(phase->MakeConX(0), phase->transform(dispX)); 404 } 405 return new AddPNode(phase->C->top(), 406 phase->transform(new CastX2PNode(base)), 407 phase->transform(dispX)); 408 } 409 410 Node *CastX2PNode::Ideal(PhaseGVN *phase, bool can_reshape) { 411 // convert CastX2P(AddX(x, y)) to AddP(CastX2P(x), y) if y fits in an int 412 int op = in(1)->Opcode(); 413 Node* x; 414 Node* y; 415 switch (op) { 416 case Op_SubX: 417 x = in(1)->in(1); 418 // Avoid ideal transformations ping-pong between this and AddP for raw pointers. 419 if (phase->find_intptr_t_con(x, -1) == 0) 420 break; 421 y = in(1)->in(2); 422 if (fits_in_int(phase->type(y), true)) { 423 return addP_of_X2P(phase, x, y, true); 424 } 425 break; 426 case Op_AddX: 427 x = in(1)->in(1); 428 y = in(1)->in(2); 429 if (fits_in_int(phase->type(y))) { 430 return addP_of_X2P(phase, x, y); 431 } 432 if (fits_in_int(phase->type(x))) { 433 return addP_of_X2P(phase, y, x); 434 } 435 break; 436 } 437 return NULL; 438 } 439 440 //------------------------------Identity--------------------------------------- 441 Node *CastX2PNode::Identity( PhaseTransform *phase ) { 442 if (in(1)->Opcode() == Op_CastP2X) return in(1)->in(1); 443 return this; 444 } 445 446 //============================================================================= 447 //------------------------------Value------------------------------------------ 448 const Type *CastP2XNode::Value( PhaseTransform *phase ) const { 449 const Type* t = phase->type(in(1)); 450 if (t == Type::TOP) return Type::TOP; 451 if (t->base() == Type::RawPtr && t->singleton()) { 452 uintptr_t bits = (uintptr_t) t->is_rawptr()->get_con(); 453 return TypeX::make(bits); 454 } 455 return CastP2XNode::bottom_type(); 456 } 457 458 Node *CastP2XNode::Ideal(PhaseGVN *phase, bool can_reshape) { 459 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; 460 } 461 462 //------------------------------Identity--------------------------------------- 463 Node *CastP2XNode::Identity( PhaseTransform *phase ) { 464 if (in(1)->Opcode() == Op_CastX2P) return in(1)->in(1); 465 return this; 466 }