1 /* 2 * Copyright (c) 1998, 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 #include "precompiled.hpp" 26 #include "compiler/compileLog.hpp" 27 #include "interpreter/linkResolver.hpp" 28 #include "memory/universe.inline.hpp" 29 #include "oops/objArrayKlass.hpp" 30 #include "opto/addnode.hpp" 31 #include "opto/castnode.hpp" 32 #include "opto/memnode.hpp" 33 #include "opto/parse.hpp" 34 #include "opto/rootnode.hpp" 35 #include "opto/runtime.hpp" 36 #include "opto/subnode.hpp" 37 #include "opto/valuetypenode.hpp" 38 #include "runtime/deoptimization.hpp" 39 #include "runtime/handles.inline.hpp" 40 41 //============================================================================= 42 // Helper methods for _get* and _put* bytecodes 43 //============================================================================= 44 bool Parse::static_field_ok_in_clinit(ciField *field, ciMethod *method) { 45 // Could be the field_holder's <clinit> method, or <clinit> for a subklass. 46 // Better to check now than to Deoptimize as soon as we execute 47 assert( field->is_static(), "Only check if field is static"); 48 // is_being_initialized() is too generous. It allows access to statics 49 // by threads that are not running the <clinit> before the <clinit> finishes. 50 // return field->holder()->is_being_initialized(); 51 52 // The following restriction is correct but conservative. 53 // It is also desirable to allow compilation of methods called from <clinit> 54 // but this generated code will need to be made safe for execution by 55 // other threads, or the transition from interpreted to compiled code would 56 // need to be guarded. 57 ciInstanceKlass *field_holder = field->holder(); 58 59 bool access_OK = false; 60 if (method->holder()->is_subclass_of(field_holder)) { 61 if (method->is_static()) { 62 if (method->name() == ciSymbol::class_initializer_name()) { 63 // OK to access static fields inside initializer 64 access_OK = true; 65 } 66 } else { 67 if (method->name() == ciSymbol::object_initializer_name()) { 68 // It's also OK to access static fields inside a constructor, 69 // because any thread calling the constructor must first have 70 // synchronized on the class by executing a '_new' bytecode. 71 access_OK = true; 72 } 73 } 74 } 75 76 return access_OK; 77 78 } 79 80 81 void Parse::do_field_access(bool is_get, bool is_field) { 82 bool will_link; 83 ciField* field = iter().get_field(will_link); 84 assert(will_link, "getfield: typeflow responsibility"); 85 86 ciInstanceKlass* field_holder = field->holder(); 87 88 if (is_field == field->is_static()) { 89 // Interpreter will throw java_lang_IncompatibleClassChangeError 90 // Check this before allowing <clinit> methods to access static fields 91 uncommon_trap(Deoptimization::Reason_unhandled, 92 Deoptimization::Action_none); 93 return; 94 } 95 96 if (!is_field && !field_holder->is_initialized()) { 97 if (!static_field_ok_in_clinit(field, method())) { 98 uncommon_trap(Deoptimization::Reason_uninitialized, 99 Deoptimization::Action_reinterpret, 100 NULL, "!static_field_ok_in_clinit"); 101 return; 102 } 103 } 104 105 // Deoptimize on putfield writes to call site target field. 106 if (!is_get && field->is_call_site_target()) { 107 uncommon_trap(Deoptimization::Reason_unhandled, 108 Deoptimization::Action_reinterpret, 109 NULL, "put to call site target field"); 110 return; 111 } 112 113 assert(field->will_link(method()->holder(), bc()), "getfield: typeflow responsibility"); 114 115 // Note: We do not check for an unloaded field type here any more. 116 117 // Generate code for the object pointer. 118 Node* obj; 119 if (is_field) { 120 int obj_depth = is_get ? 0 : field->type()->size(); 121 obj = null_check(peek(obj_depth)); 122 // Compile-time detect of null-exception? 123 if (stopped()) return; 124 125 #ifdef ASSERT 126 const TypeInstPtr *tjp = TypeInstPtr::make(TypePtr::NotNull, iter().get_declared_field_holder()); 127 assert(_gvn.type(obj)->higher_equal(tjp), "cast_up is no longer needed"); 128 #endif 129 130 if (is_get) { 131 (void) pop(); // pop receiver before getting 132 do_get_xxx(obj, field, is_field); 133 } else { 134 do_put_xxx(obj, field, is_field); 135 (void) pop(); // pop receiver after putting 136 } 137 } else { 138 const TypeInstPtr* tip = TypeInstPtr::make(field_holder->java_mirror()); 139 obj = _gvn.makecon(tip); 140 if (is_get) { 141 do_get_xxx(obj, field, is_field); 142 } else { 143 do_put_xxx(obj, field, is_field); 144 } 145 } 146 } 147 148 void Parse::do_vgetfield() { 149 // fixme null/top check? 150 bool will_link; 151 ciField* field = iter().get_field(will_link); 152 BasicType bt = field->layout_type(); 153 ValueTypeNode* vt = pop()->as_ValueType(); 154 Node* value = vt->get_field_value_by_offset(field->offset()); 155 push_node(bt, value); 156 } 157 158 void Parse::do_get_xxx(Node* obj, ciField* field, bool is_field) { 159 // Does this field have a constant value? If so, just push the value. 160 if (field->is_constant()) { 161 // final or stable field 162 const Type* con_type = Type::make_constant(field, obj); 163 if (con_type != NULL) { 164 push_node(con_type->basic_type(), makecon(con_type)); 165 return; 166 } 167 } 168 169 ciType* field_klass = field->type(); 170 bool is_vol = field->is_volatile(); 171 172 // Compute address and memory type. 173 int offset = field->offset_in_bytes(); 174 const TypePtr* adr_type = C->alias_type(field)->adr_type(); 175 Node *adr = basic_plus_adr(obj, obj, offset); 176 BasicType bt = field->layout_type(); 177 178 // Build the resultant type of the load 179 const Type *type; 180 181 bool must_assert_null = false; 182 183 if (bt == T_OBJECT || bt == T_VALUETYPE) { 184 if (!field->type()->is_loaded()) { 185 type = TypeInstPtr::BOTTOM; 186 must_assert_null = true; 187 } else if (field->is_constant() && field->is_static()) { 188 // This can happen if the constant oop is non-perm. 189 ciObject* con = field->constant_value().as_object(); 190 // Do not "join" in the previous type; it doesn't add value, 191 // and may yield a vacuous result if the field is of interface type. 192 type = TypeOopPtr::make_from_constant(con)->isa_oopptr(); 193 assert(type != NULL, "field singleton type must be consistent"); 194 } else { 195 type = TypeOopPtr::make_from_klass(field_klass->as_klass()); 196 } 197 } else { 198 type = Type::get_const_basic_type(bt); 199 } 200 if (support_IRIW_for_not_multiple_copy_atomic_cpu && field->is_volatile()) { 201 insert_mem_bar(Op_MemBarVolatile); // StoreLoad barrier 202 } 203 204 if (type->isa_valuetypeptr()) { 205 // Load value type from flattened field 206 Node* vt = ValueTypeNode::make(_gvn, field_klass->as_value_klass(), map()->memory(), field->holder(), obj, offset); 207 push_node(bt, vt); 208 return; 209 } 210 211 // Build the load. 212 // 213 MemNode::MemOrd mo = is_vol ? MemNode::acquire : MemNode::unordered; 214 bool needs_atomic_access = is_vol || AlwaysAtomicAccesses; 215 Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, LoadNode::DependsOnlyOnTest, needs_atomic_access); 216 217 // Adjust Java stack 218 if (type2size[bt] == 1) 219 push(ld); 220 else 221 push_pair(ld); 222 223 if (must_assert_null) { 224 // Do not take a trap here. It's possible that the program 225 // will never load the field's class, and will happily see 226 // null values in this field forever. Don't stumble into a 227 // trap for such a program, or we might get a long series 228 // of useless recompilations. (Or, we might load a class 229 // which should not be loaded.) If we ever see a non-null 230 // value, we will then trap and recompile. (The trap will 231 // not need to mention the class index, since the class will 232 // already have been loaded if we ever see a non-null value.) 233 // uncommon_trap(iter().get_field_signature_index()); 234 if (PrintOpto && (Verbose || WizardMode)) { 235 method()->print_name(); tty->print_cr(" asserting nullness of field at bci: %d", bci()); 236 } 237 if (C->log() != NULL) { 238 C->log()->elem("assert_null reason='field' klass='%d'", 239 C->log()->identify(field->type())); 240 } 241 // If there is going to be a trap, put it at the next bytecode: 242 set_bci(iter().next_bci()); 243 null_assert(peek()); 244 set_bci(iter().cur_bci()); // put it back 245 } 246 247 // If reference is volatile, prevent following memory ops from 248 // floating up past the volatile read. Also prevents commoning 249 // another volatile read. 250 if (field->is_volatile()) { 251 // Memory barrier includes bogus read of value to force load BEFORE membar 252 insert_mem_bar(Op_MemBarAcquire, ld); 253 } 254 } 255 256 void Parse::do_put_xxx(Node* obj, ciField* field, bool is_field) { 257 bool is_vol = field->is_volatile(); 258 // If reference is volatile, prevent following memory ops from 259 // floating down past the volatile write. Also prevents commoning 260 // another volatile read. 261 if (is_vol) insert_mem_bar(Op_MemBarRelease); 262 263 // Compute address and memory type. 264 int offset = field->offset_in_bytes(); 265 const TypePtr* adr_type = C->alias_type(field)->adr_type(); 266 Node* adr = basic_plus_adr(obj, obj, offset); 267 BasicType bt = field->layout_type(); 268 // Value to be stored 269 Node* val = type2size[bt] == 1 ? pop() : pop_pair(); 270 // Round doubles before storing 271 if (bt == T_DOUBLE) val = dstore_rounding(val); 272 273 // Conservatively release stores of object references. 274 const MemNode::MemOrd mo = 275 is_vol ? 276 // Volatile fields need releasing stores. 277 MemNode::release : 278 // Non-volatile fields also need releasing stores if they hold an 279 // object reference, because the object reference might point to 280 // a freshly created object. 281 StoreNode::release_if_reference(bt); 282 283 // Store the value. 284 Node* store; 285 if (bt == T_OBJECT) { 286 const TypeOopPtr* field_type; 287 if (!field->type()->is_loaded()) { 288 field_type = TypeInstPtr::BOTTOM; 289 } else { 290 field_type = TypeOopPtr::make_from_klass(field->type()->as_klass()); 291 } 292 store = store_oop_to_object(control(), obj, adr, adr_type, val, field_type, bt, mo); 293 } else if (bt == T_VALUETYPE) { 294 // Store value type to flattened field 295 val->as_ValueType()->store_to_field(this, field->holder(), obj, offset); 296 } else { 297 bool needs_atomic_access = is_vol || AlwaysAtomicAccesses; 298 store = store_to_memory(control(), adr, val, bt, adr_type, mo, needs_atomic_access); 299 } 300 301 // If reference is volatile, prevent following volatiles ops from 302 // floating up before the volatile write. 303 if (is_vol) { 304 // If not multiple copy atomic, we do the MemBarVolatile before the load. 305 if (!support_IRIW_for_not_multiple_copy_atomic_cpu) { 306 insert_mem_bar(Op_MemBarVolatile); // Use fat membar 307 } 308 // Remember we wrote a volatile field. 309 // For not multiple copy atomic cpu (ppc64) a barrier should be issued 310 // in constructors which have such stores. See do_exits() in parse1.cpp. 311 if (is_field) { 312 set_wrote_volatile(true); 313 } 314 } 315 316 if (is_field) { 317 set_wrote_fields(true); 318 } 319 320 // If the field is final, the rules of Java say we are in <init> or <clinit>. 321 // Note the presence of writes to final non-static fields, so that we 322 // can insert a memory barrier later on to keep the writes from floating 323 // out of the constructor. 324 // Any method can write a @Stable field; insert memory barriers after those also. 325 if (is_field && (field->is_final() || field->is_stable())) { 326 if (field->is_final()) { 327 set_wrote_final(true); 328 } 329 if (field->is_stable()) { 330 set_wrote_stable(true); 331 } 332 333 // Preserve allocation ptr to create precedent edge to it in membar 334 // generated on exit from constructor. 335 // Can't bind stable with its allocation, only record allocation for final field. 336 if (field->is_final() && AllocateNode::Ideal_allocation(obj, &_gvn) != NULL) { 337 set_alloc_with_final(obj); 338 } 339 } 340 } 341 342 //============================================================================= 343 void Parse::do_anewarray() { 344 bool will_link; 345 ciKlass* klass = iter().get_klass(will_link); 346 347 // Uncommon Trap when class that array contains is not loaded 348 // we need the loaded class for the rest of graph; do not 349 // initialize the container class (see Java spec)!!! 350 assert(will_link, "anewarray: typeflow responsibility"); 351 352 ciObjArrayKlass* array_klass = ciObjArrayKlass::make(klass); 353 // Check that array_klass object is loaded 354 if (!array_klass->is_loaded()) { 355 // Generate uncommon_trap for unloaded array_class 356 uncommon_trap(Deoptimization::Reason_unloaded, 357 Deoptimization::Action_reinterpret, 358 array_klass); 359 return; 360 } 361 362 kill_dead_locals(); 363 364 const TypeKlassPtr* array_klass_type = TypeKlassPtr::make(array_klass); 365 Node* count_val = pop(); 366 Node* obj = new_array(makecon(array_klass_type), count_val, 1); 367 push(obj); 368 } 369 370 371 void Parse::do_newarray(BasicType elem_type) { 372 kill_dead_locals(); 373 374 Node* count_val = pop(); 375 const TypeKlassPtr* array_klass = TypeKlassPtr::make(ciTypeArrayKlass::make(elem_type)); 376 Node* obj = new_array(makecon(array_klass), count_val, 1); 377 // Push resultant oop onto stack 378 push(obj); 379 } 380 381 // Expand simple expressions like new int[3][5] and new Object[2][nonConLen]. 382 // Also handle the degenerate 1-dimensional case of anewarray. 383 Node* Parse::expand_multianewarray(ciArrayKlass* array_klass, Node* *lengths, int ndimensions, int nargs) { 384 Node* length = lengths[0]; 385 assert(length != NULL, ""); 386 Node* array = new_array(makecon(TypeKlassPtr::make(array_klass)), length, nargs); 387 if (ndimensions > 1) { 388 jint length_con = find_int_con(length, -1); 389 guarantee(length_con >= 0, "non-constant multianewarray"); 390 ciArrayKlass* array_klass_1 = array_klass->as_obj_array_klass()->element_klass()->as_array_klass(); 391 const TypePtr* adr_type = TypeAryPtr::OOPS; 392 const TypeOopPtr* elemtype = _gvn.type(array)->is_aryptr()->elem()->make_oopptr(); 393 const intptr_t header = arrayOopDesc::base_offset_in_bytes(T_OBJECT); 394 for (jint i = 0; i < length_con; i++) { 395 Node* elem = expand_multianewarray(array_klass_1, &lengths[1], ndimensions-1, nargs); 396 intptr_t offset = header + ((intptr_t)i << LogBytesPerHeapOop); 397 Node* eaddr = basic_plus_adr(array, offset); 398 store_oop_to_array(control(), array, eaddr, adr_type, elem, elemtype, T_OBJECT, MemNode::unordered); 399 } 400 } 401 return array; 402 } 403 404 void Parse::do_multianewarray() { 405 int ndimensions = iter().get_dimensions(); 406 407 // the m-dimensional array 408 bool will_link; 409 ciArrayKlass* array_klass = iter().get_klass(will_link)->as_array_klass(); 410 assert(will_link, "multianewarray: typeflow responsibility"); 411 412 // Note: Array classes are always initialized; no is_initialized check. 413 414 kill_dead_locals(); 415 416 // get the lengths from the stack (first dimension is on top) 417 Node** length = NEW_RESOURCE_ARRAY(Node*, ndimensions + 1); 418 length[ndimensions] = NULL; // terminating null for make_runtime_call 419 int j; 420 for (j = ndimensions-1; j >= 0 ; j--) length[j] = pop(); 421 422 // The original expression was of this form: new T[length0][length1]... 423 // It is often the case that the lengths are small (except the last). 424 // If that happens, use the fast 1-d creator a constant number of times. 425 const jint expand_limit = MIN2((jint)MultiArrayExpandLimit, 100); 426 jint expand_count = 1; // count of allocations in the expansion 427 jint expand_fanout = 1; // running total fanout 428 for (j = 0; j < ndimensions-1; j++) { 429 jint dim_con = find_int_con(length[j], -1); 430 expand_fanout *= dim_con; 431 expand_count += expand_fanout; // count the level-J sub-arrays 432 if (dim_con <= 0 433 || dim_con > expand_limit 434 || expand_count > expand_limit) { 435 expand_count = 0; 436 break; 437 } 438 } 439 440 // Can use multianewarray instead of [a]newarray if only one dimension, 441 // or if all non-final dimensions are small constants. 442 if (ndimensions == 1 || (1 <= expand_count && expand_count <= expand_limit)) { 443 Node* obj = NULL; 444 // Set the original stack and the reexecute bit for the interpreter 445 // to reexecute the multianewarray bytecode if deoptimization happens. 446 // Do it unconditionally even for one dimension multianewarray. 447 // Note: the reexecute bit will be set in GraphKit::add_safepoint_edges() 448 // when AllocateArray node for newarray is created. 449 { PreserveReexecuteState preexecs(this); 450 inc_sp(ndimensions); 451 // Pass 0 as nargs since uncommon trap code does not need to restore stack. 452 obj = expand_multianewarray(array_klass, &length[0], ndimensions, 0); 453 } //original reexecute and sp are set back here 454 push(obj); 455 return; 456 } 457 458 address fun = NULL; 459 switch (ndimensions) { 460 case 1: ShouldNotReachHere(); break; 461 case 2: fun = OptoRuntime::multianewarray2_Java(); break; 462 case 3: fun = OptoRuntime::multianewarray3_Java(); break; 463 case 4: fun = OptoRuntime::multianewarray4_Java(); break; 464 case 5: fun = OptoRuntime::multianewarray5_Java(); break; 465 }; 466 Node* c = NULL; 467 468 if (fun != NULL) { 469 c = make_runtime_call(RC_NO_LEAF | RC_NO_IO, 470 OptoRuntime::multianewarray_Type(ndimensions), 471 fun, NULL, TypeRawPtr::BOTTOM, 472 makecon(TypeKlassPtr::make(array_klass)), 473 length[0], length[1], length[2], 474 (ndimensions > 2) ? length[3] : NULL, 475 (ndimensions > 3) ? length[4] : NULL); 476 } else { 477 // Create a java array for dimension sizes 478 Node* dims = NULL; 479 { PreserveReexecuteState preexecs(this); 480 inc_sp(ndimensions); 481 Node* dims_array_klass = makecon(TypeKlassPtr::make(ciArrayKlass::make(ciType::make(T_INT)))); 482 dims = new_array(dims_array_klass, intcon(ndimensions), 0); 483 484 // Fill-in it with values 485 for (j = 0; j < ndimensions; j++) { 486 Node *dims_elem = array_element_address(dims, intcon(j), T_INT); 487 store_to_memory(control(), dims_elem, length[j], T_INT, TypeAryPtr::INTS, MemNode::unordered); 488 } 489 } 490 491 c = make_runtime_call(RC_NO_LEAF | RC_NO_IO, 492 OptoRuntime::multianewarrayN_Type(), 493 OptoRuntime::multianewarrayN_Java(), NULL, TypeRawPtr::BOTTOM, 494 makecon(TypeKlassPtr::make(array_klass)), 495 dims); 496 } 497 make_slow_call_ex(c, env()->Throwable_klass(), false); 498 499 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms)); 500 501 const Type* type = TypeOopPtr::make_from_klass_raw(array_klass); 502 503 // Improve the type: We know it's not null, exact, and of a given length. 504 type = type->is_ptr()->cast_to_ptr_type(TypePtr::NotNull); 505 type = type->is_aryptr()->cast_to_exactness(true); 506 507 const TypeInt* ltype = _gvn.find_int_type(length[0]); 508 if (ltype != NULL) 509 type = type->is_aryptr()->cast_to_size(ltype); 510 511 // We cannot sharpen the nested sub-arrays, since the top level is mutable. 512 513 Node* cast = _gvn.transform( new CheckCastPPNode(control(), res, type) ); 514 push(cast); 515 516 // Possible improvements: 517 // - Make a fast path for small multi-arrays. (W/ implicit init. loops.) 518 // - Issue CastII against length[*] values, to TypeInt::POS. 519 }