1 /* 2 * Copyright (c) 2001, 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_OPTO_GRAPHKIT_HPP 26 #define SHARE_VM_OPTO_GRAPHKIT_HPP 27 28 #include "ci/ciEnv.hpp" 29 #include "ci/ciMethodData.hpp" 30 #include "opto/addnode.hpp" 31 #include "opto/callnode.hpp" 32 #include "opto/cfgnode.hpp" 33 #include "opto/compile.hpp" 34 #include "opto/divnode.hpp" 35 #include "opto/mulnode.hpp" 36 #include "opto/phaseX.hpp" 37 #include "opto/subnode.hpp" 38 #include "opto/type.hpp" 39 #include "runtime/deoptimization.hpp" 40 41 class FastLockNode; 42 class FastUnlockNode; 43 class IdealKit; 44 class LibraryCallKit; 45 class Parse; 46 class RootNode; 47 48 //----------------------------------------------------------------------------- 49 //----------------------------GraphKit----------------------------------------- 50 // Toolkit for building the common sorts of subgraphs. 51 // Does not know about bytecode parsing or type-flow results. 52 // It is able to create graphs implementing the semantics of most 53 // or all bytecodes, so that it can expand intrinsics and calls. 54 // It may depend on JVMState structure, but it must not depend 55 // on specific bytecode streams. 56 class GraphKit : public Phase { 57 friend class PreserveJVMState; 58 59 protected: 60 ciEnv* _env; // Compilation environment 61 PhaseGVN &_gvn; // Some optimizations while parsing 62 SafePointNode* _map; // Parser map from JVM to Nodes 63 SafePointNode* _exceptions;// Parser map(s) for exception state(s) 64 int _bci; // JVM Bytecode Pointer 65 ciMethod* _method; // JVM Current Method 66 67 private: 68 int _sp; // JVM Expression Stack Pointer; don't modify directly! 69 70 private: 71 SafePointNode* map_not_null() const { 72 assert(_map != NULL, "must call stopped() to test for reset compiler map"); 73 return _map; 74 } 75 76 public: 77 GraphKit(); // empty constructor 78 GraphKit(JVMState* jvms); // the JVM state on which to operate 79 80 #ifdef ASSERT 81 ~GraphKit() { 82 assert(!has_exceptions(), "user must call transfer_exceptions_into_jvms"); 83 } 84 #endif 85 86 virtual Parse* is_Parse() const { return NULL; } 87 virtual LibraryCallKit* is_LibraryCallKit() const { return NULL; } 88 89 ciEnv* env() const { return _env; } 90 PhaseGVN& gvn() const { return _gvn; } 91 92 void record_for_igvn(Node* n) const { C->record_for_igvn(n); } // delegate to Compile 93 94 // Handy well-known nodes: 95 Node* null() const { return zerocon(T_OBJECT); } 96 Node* top() const { return C->top(); } 97 RootNode* root() const { return C->root(); } 98 99 // Create or find a constant node 100 Node* intcon(jint con) const { return _gvn.intcon(con); } 101 Node* longcon(jlong con) const { return _gvn.longcon(con); } 102 Node* makecon(const Type *t) const { return _gvn.makecon(t); } 103 Node* zerocon(BasicType bt) const { return _gvn.zerocon(bt); } 104 // (See also macro MakeConX in type.hpp, which uses intcon or longcon.) 105 106 // Helper for byte_map_base 107 Node* byte_map_base_node() { 108 // Get base of card map 109 CardTableModRefBS* ct = (CardTableModRefBS*)(Universe::heap()->barrier_set()); 110 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust users of this code"); 111 if (ct->byte_map_base != NULL) { 112 return makecon(TypeRawPtr::make((address)ct->byte_map_base)); 113 } else { 114 return null(); 115 } 116 } 117 118 jint find_int_con(Node* n, jint value_if_unknown) { 119 return _gvn.find_int_con(n, value_if_unknown); 120 } 121 jlong find_long_con(Node* n, jlong value_if_unknown) { 122 return _gvn.find_long_con(n, value_if_unknown); 123 } 124 // (See also macro find_intptr_t_con in type.hpp, which uses one of these.) 125 126 // JVM State accessors: 127 // Parser mapping from JVM indices into Nodes. 128 // Low slots are accessed by the StartNode::enum. 129 // Then come the locals at StartNode::Parms to StartNode::Parms+max_locals(); 130 // Then come JVM stack slots. 131 // Finally come the monitors, if any. 132 // See layout accessors in class JVMState. 133 134 SafePointNode* map() const { return _map; } 135 bool has_exceptions() const { return _exceptions != NULL; } 136 JVMState* jvms() const { return map_not_null()->_jvms; } 137 int sp() const { return _sp; } 138 int bci() const { return _bci; } 139 Bytecodes::Code java_bc() const; 140 ciMethod* method() const { return _method; } 141 142 void set_jvms(JVMState* jvms) { set_map(jvms->map()); 143 assert(jvms == this->jvms(), "sanity"); 144 _sp = jvms->sp(); 145 _bci = jvms->bci(); 146 _method = jvms->has_method() ? jvms->method() : NULL; } 147 void set_map(SafePointNode* m) { _map = m; debug_only(verify_map()); } 148 void set_sp(int sp) { assert(sp >= 0, err_msg_res("sp must be non-negative: %d", sp)); _sp = sp; } 149 void clean_stack(int from_sp); // clear garbage beyond from_sp to top 150 151 void inc_sp(int i) { set_sp(sp() + i); } 152 void dec_sp(int i) { set_sp(sp() - i); } 153 void set_bci(int bci) { _bci = bci; } 154 155 // Make sure jvms has current bci & sp. 156 JVMState* sync_jvms() const; 157 JVMState* sync_jvms_for_reexecute(); 158 159 #ifdef ASSERT 160 // Make sure JVMS has an updated copy of bci and sp. 161 // Also sanity-check method, depth, and monitor depth. 162 bool jvms_in_sync() const; 163 164 // Make sure the map looks OK. 165 void verify_map() const; 166 167 // Make sure a proposed exception state looks OK. 168 static void verify_exception_state(SafePointNode* ex_map); 169 #endif 170 171 // Clone the existing map state. (Implements PreserveJVMState.) 172 SafePointNode* clone_map(); 173 174 // Set the map to a clone of the given one. 175 void set_map_clone(SafePointNode* m); 176 177 // Tell if the compilation is failing. 178 bool failing() const { return C->failing(); } 179 180 // Set _map to NULL, signalling a stop to further bytecode execution. 181 // Preserve the map intact for future use, and return it back to the caller. 182 SafePointNode* stop() { SafePointNode* m = map(); set_map(NULL); return m; } 183 184 // Stop, but first smash the map's inputs to NULL, to mark it dead. 185 void stop_and_kill_map(); 186 187 // Tell if _map is NULL, or control is top. 188 bool stopped(); 189 190 // Tell if this method or any caller method has exception handlers. 191 bool has_ex_handler(); 192 193 // Save an exception without blowing stack contents or other JVM state. 194 // (The extra pointer is stuck with add_req on the map, beyond the JVMS.) 195 static void set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop); 196 197 // Recover a saved exception from its map. 198 static Node* saved_ex_oop(SafePointNode* ex_map); 199 200 // Recover a saved exception from its map, and remove it from the map. 201 static Node* clear_saved_ex_oop(SafePointNode* ex_map); 202 203 #ifdef ASSERT 204 // Recover a saved exception from its map, and remove it from the map. 205 static bool has_saved_ex_oop(SafePointNode* ex_map); 206 #endif 207 208 // Push an exception in the canonical position for handlers (stack(0)). 209 void push_ex_oop(Node* ex_oop) { 210 ensure_stack(1); // ensure room to push the exception 211 set_stack(0, ex_oop); 212 set_sp(1); 213 clean_stack(1); 214 } 215 216 // Detach and return an exception state. 217 SafePointNode* pop_exception_state() { 218 SafePointNode* ex_map = _exceptions; 219 if (ex_map != NULL) { 220 _exceptions = ex_map->next_exception(); 221 ex_map->set_next_exception(NULL); 222 debug_only(verify_exception_state(ex_map)); 223 } 224 return ex_map; 225 } 226 227 // Add an exception, using the given JVM state, without commoning. 228 void push_exception_state(SafePointNode* ex_map) { 229 debug_only(verify_exception_state(ex_map)); 230 ex_map->set_next_exception(_exceptions); 231 _exceptions = ex_map; 232 } 233 234 // Turn the current JVM state into an exception state, appending the ex_oop. 235 SafePointNode* make_exception_state(Node* ex_oop); 236 237 // Add an exception, using the given JVM state. 238 // Combine all exceptions with a common exception type into a single state. 239 // (This is done via combine_exception_states.) 240 void add_exception_state(SafePointNode* ex_map); 241 242 // Combine all exceptions of any sort whatever into a single master state. 243 SafePointNode* combine_and_pop_all_exception_states() { 244 if (_exceptions == NULL) return NULL; 245 SafePointNode* phi_map = pop_exception_state(); 246 SafePointNode* ex_map; 247 while ((ex_map = pop_exception_state()) != NULL) { 248 combine_exception_states(ex_map, phi_map); 249 } 250 return phi_map; 251 } 252 253 // Combine the two exception states, building phis as necessary. 254 // The second argument is updated to include contributions from the first. 255 void combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map); 256 257 // Reset the map to the given state. If there are any half-finished phis 258 // in it (created by combine_exception_states), transform them now. 259 // Returns the exception oop. (Caller must call push_ex_oop if required.) 260 Node* use_exception_state(SafePointNode* ex_map); 261 262 // Collect exceptions from a given JVM state into my exception list. 263 void add_exception_states_from(JVMState* jvms); 264 265 // Collect all raised exceptions into the current JVM state. 266 // Clear the current exception list and map, returns the combined states. 267 JVMState* transfer_exceptions_into_jvms(); 268 269 // Helper to throw a built-in exception. 270 // Range checks take the offending index. 271 // Cast and array store checks take the offending class. 272 // Others do not take the optional argument. 273 // The JVMS must allow the bytecode to be re-executed 274 // via an uncommon trap. 275 void builtin_throw(Deoptimization::DeoptReason reason, Node* arg = NULL); 276 277 // Helper to check the JavaThread::_should_post_on_exceptions flag 278 // and branch to an uncommon_trap if it is true (with the specified reason and must_throw) 279 void uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason, 280 bool must_throw) ; 281 282 // Helper Functions for adding debug information 283 void kill_dead_locals(); 284 #ifdef ASSERT 285 bool dead_locals_are_killed(); 286 #endif 287 // The call may deoptimize. Supply required JVM state as debug info. 288 // If must_throw is true, the call is guaranteed not to return normally. 289 void add_safepoint_edges(SafePointNode* call, 290 bool must_throw = false); 291 292 // How many stack inputs does the current BC consume? 293 // And, how does the stack change after the bytecode? 294 // Returns false if unknown. 295 bool compute_stack_effects(int& inputs, int& depth); 296 297 // Add a fixed offset to a pointer 298 Node* basic_plus_adr(Node* base, Node* ptr, intptr_t offset) { 299 return basic_plus_adr(base, ptr, MakeConX(offset)); 300 } 301 Node* basic_plus_adr(Node* base, intptr_t offset) { 302 return basic_plus_adr(base, base, MakeConX(offset)); 303 } 304 // Add a variable offset to a pointer 305 Node* basic_plus_adr(Node* base, Node* offset) { 306 return basic_plus_adr(base, base, offset); 307 } 308 Node* basic_plus_adr(Node* base, Node* ptr, Node* offset); 309 310 311 // Some convenient shortcuts for common nodes 312 Node* IfTrue(IfNode* iff) { return _gvn.transform(new (C) IfTrueNode(iff)); } 313 Node* IfFalse(IfNode* iff) { return _gvn.transform(new (C) IfFalseNode(iff)); } 314 315 Node* AddI(Node* l, Node* r) { return _gvn.transform(new (C) AddINode(l, r)); } 316 Node* SubI(Node* l, Node* r) { return _gvn.transform(new (C) SubINode(l, r)); } 317 Node* MulI(Node* l, Node* r) { return _gvn.transform(new (C) MulINode(l, r)); } 318 Node* DivI(Node* ctl, Node* l, Node* r) { return _gvn.transform(new (C) DivINode(ctl, l, r)); } 319 320 Node* AndI(Node* l, Node* r) { return _gvn.transform(new (C) AndINode(l, r)); } 321 Node* OrI(Node* l, Node* r) { return _gvn.transform(new (C) OrINode(l, r)); } 322 Node* XorI(Node* l, Node* r) { return _gvn.transform(new (C) XorINode(l, r)); } 323 324 Node* MaxI(Node* l, Node* r) { return _gvn.transform(new (C) MaxINode(l, r)); } 325 Node* MinI(Node* l, Node* r) { return _gvn.transform(new (C) MinINode(l, r)); } 326 327 Node* LShiftI(Node* l, Node* r) { return _gvn.transform(new (C) LShiftINode(l, r)); } 328 Node* RShiftI(Node* l, Node* r) { return _gvn.transform(new (C) RShiftINode(l, r)); } 329 Node* URShiftI(Node* l, Node* r) { return _gvn.transform(new (C) URShiftINode(l, r)); } 330 331 Node* CmpI(Node* l, Node* r) { return _gvn.transform(new (C) CmpINode(l, r)); } 332 Node* CmpL(Node* l, Node* r) { return _gvn.transform(new (C) CmpLNode(l, r)); } 333 Node* CmpP(Node* l, Node* r) { return _gvn.transform(new (C) CmpPNode(l, r)); } 334 Node* Bool(Node* cmp, BoolTest::mask relop) { return _gvn.transform(new (C) BoolNode(cmp, relop)); } 335 336 Node* AddP(Node* b, Node* a, Node* o) { return _gvn.transform(new (C) AddPNode(b, a, o)); } 337 338 // Convert between int and long, and size_t. 339 // (See macros ConvI2X, etc., in type.hpp for ConvI2X, etc.) 340 Node* ConvI2L(Node* offset); 341 Node* ConvI2UL(Node* offset); 342 Node* ConvL2I(Node* offset); 343 // Find out the klass of an object. 344 Node* load_object_klass(Node* object); 345 // Find out the length of an array. 346 Node* load_array_length(Node* array); 347 348 349 // Helper function to do a NULL pointer check or ZERO check based on type. 350 // Throw an exception if a given value is null. 351 // Return the value cast to not-null. 352 // Be clever about equivalent dominating null checks. 353 Node* null_check_common(Node* value, BasicType type, 354 bool assert_null = false, 355 Node* *null_control = NULL, 356 bool speculative = false); 357 Node* null_check(Node* value, BasicType type = T_OBJECT) { 358 return null_check_common(value, type, false, NULL, !_gvn.type(value)->speculative_maybe_null()); 359 } 360 Node* null_check_receiver() { 361 assert(argument(0)->bottom_type()->isa_ptr(), "must be"); 362 return null_check(argument(0)); 363 } 364 Node* zero_check_int(Node* value) { 365 assert(value->bottom_type()->basic_type() == T_INT, 366 err_msg_res("wrong type: %s", type2name(value->bottom_type()->basic_type()))); 367 return null_check_common(value, T_INT); 368 } 369 Node* zero_check_long(Node* value) { 370 assert(value->bottom_type()->basic_type() == T_LONG, 371 err_msg_res("wrong type: %s", type2name(value->bottom_type()->basic_type()))); 372 return null_check_common(value, T_LONG); 373 } 374 // Throw an uncommon trap if a given value is __not__ null. 375 // Return the value cast to null, and be clever about dominating checks. 376 Node* null_assert(Node* value, BasicType type = T_OBJECT) { 377 return null_check_common(value, type, true); 378 } 379 380 // Null check oop. Return null-path control into (*null_control). 381 // Return a cast-not-null node which depends on the not-null control. 382 // If never_see_null, use an uncommon trap (*null_control sees a top). 383 // The cast is not valid along the null path; keep a copy of the original. 384 // If safe_for_replace, then we can replace the value with the cast 385 // in the parsing map (the cast is guaranteed to dominate the map) 386 Node* null_check_oop(Node* value, Node* *null_control, 387 bool never_see_null = false, 388 bool safe_for_replace = false, 389 bool speculative = false); 390 391 // Check the null_seen bit. 392 bool seems_never_null(Node* obj, ciProfileData* data, bool& speculating); 393 394 // Check for unique class for receiver at call 395 ciKlass* profile_has_unique_klass() { 396 ciCallProfile profile = method()->call_profile_at_bci(bci()); 397 if (profile.count() >= 0 && // no cast failures here 398 profile.has_receiver(0) && 399 profile.morphism() == 1) { 400 return profile.receiver(0); 401 } 402 return NULL; 403 } 404 405 // record type from profiling with the type system 406 Node* record_profile_for_speculation(Node* n, ciKlass* exact_kls, bool maybe_null); 407 void record_profiled_arguments_for_speculation(ciMethod* dest_method, Bytecodes::Code bc); 408 void record_profiled_parameters_for_speculation(); 409 void record_profiled_return_for_speculation(); 410 Node* record_profiled_receiver_for_speculation(Node* n); 411 412 // Use the type profile to narrow an object type. 413 Node* maybe_cast_profiled_receiver(Node* not_null_obj, 414 ciKlass* require_klass, 415 ciKlass* spec, 416 bool safe_for_replace); 417 418 // Cast obj to type and emit guard unless we had too many traps here already 419 Node* maybe_cast_profiled_obj(Node* obj, 420 ciKlass* type, 421 bool not_null = false); 422 423 // Cast obj to not-null on this path 424 Node* cast_not_null(Node* obj, bool do_replace_in_map = true); 425 // Replace all occurrences of one node by another. 426 void replace_in_map(Node* old, Node* neww); 427 428 void push(Node* n) { map_not_null(); _map->set_stack(_map->_jvms, _sp++ , n); } 429 Node* pop() { map_not_null(); return _map->stack( _map->_jvms, --_sp ); } 430 Node* peek(int off = 0) { map_not_null(); return _map->stack( _map->_jvms, _sp - off - 1 ); } 431 432 void push_pair(Node* ldval) { 433 push(ldval); 434 push(top()); // the halfword is merely a placeholder 435 } 436 void push_pair_local(int i) { 437 // longs are stored in locals in "push" order 438 push( local(i+0) ); // the real value 439 assert(local(i+1) == top(), ""); 440 push(top()); // halfword placeholder 441 } 442 Node* pop_pair() { 443 // the second half is pushed last & popped first; it contains exactly nothing 444 Node* halfword = pop(); 445 assert(halfword == top(), ""); 446 // the long bits are pushed first & popped last: 447 return pop(); 448 } 449 void set_pair_local(int i, Node* lval) { 450 // longs are stored in locals as a value/half pair (like doubles) 451 set_local(i+0, lval); 452 set_local(i+1, top()); 453 } 454 455 // Push the node, which may be zero, one, or two words. 456 void push_node(BasicType n_type, Node* n) { 457 int n_size = type2size[n_type]; 458 if (n_size == 1) push( n ); // T_INT, ... 459 else if (n_size == 2) push_pair( n ); // T_DOUBLE, T_LONG 460 else { assert(n_size == 0, "must be T_VOID"); } 461 } 462 463 Node* pop_node(BasicType n_type) { 464 int n_size = type2size[n_type]; 465 if (n_size == 1) return pop(); 466 else if (n_size == 2) return pop_pair(); 467 else return NULL; 468 } 469 470 Node* control() const { return map_not_null()->control(); } 471 Node* i_o() const { return map_not_null()->i_o(); } 472 Node* returnadr() const { return map_not_null()->returnadr(); } 473 Node* frameptr() const { return map_not_null()->frameptr(); } 474 Node* local(uint idx) const { map_not_null(); return _map->local( _map->_jvms, idx); } 475 Node* stack(uint idx) const { map_not_null(); return _map->stack( _map->_jvms, idx); } 476 Node* argument(uint idx) const { map_not_null(); return _map->argument( _map->_jvms, idx); } 477 Node* monitor_box(uint idx) const { map_not_null(); return _map->monitor_box(_map->_jvms, idx); } 478 Node* monitor_obj(uint idx) const { map_not_null(); return _map->monitor_obj(_map->_jvms, idx); } 479 480 void set_control (Node* c) { map_not_null()->set_control(c); } 481 void set_i_o (Node* c) { map_not_null()->set_i_o(c); } 482 void set_local(uint idx, Node* c) { map_not_null(); _map->set_local( _map->_jvms, idx, c); } 483 void set_stack(uint idx, Node* c) { map_not_null(); _map->set_stack( _map->_jvms, idx, c); } 484 void set_argument(uint idx, Node* c){ map_not_null(); _map->set_argument(_map->_jvms, idx, c); } 485 void ensure_stack(uint stk_size) { map_not_null(); _map->ensure_stack(_map->_jvms, stk_size); } 486 487 // Access unaliased memory 488 Node* memory(uint alias_idx); 489 Node* memory(const TypePtr *tp) { return memory(C->get_alias_index(tp)); } 490 Node* memory(Node* adr) { return memory(_gvn.type(adr)->is_ptr()); } 491 492 // Access immutable memory 493 Node* immutable_memory() { return C->immutable_memory(); } 494 495 // Set unaliased memory 496 void set_memory(Node* c, uint alias_idx) { merged_memory()->set_memory_at(alias_idx, c); } 497 void set_memory(Node* c, const TypePtr *tp) { set_memory(c,C->get_alias_index(tp)); } 498 void set_memory(Node* c, Node* adr) { set_memory(c,_gvn.type(adr)->is_ptr()); } 499 500 // Get the entire memory state (probably a MergeMemNode), and reset it 501 // (The resetting prevents somebody from using the dangling Node pointer.) 502 Node* reset_memory(); 503 504 // Get the entire memory state, asserted to be a MergeMemNode. 505 MergeMemNode* merged_memory() { 506 Node* mem = map_not_null()->memory(); 507 assert(mem->is_MergeMem(), "parse memory is always pre-split"); 508 return mem->as_MergeMem(); 509 } 510 511 // Set the entire memory state; produce a new MergeMemNode. 512 void set_all_memory(Node* newmem); 513 514 // Create a memory projection from the call, then set_all_memory. 515 void set_all_memory_call(Node* call, bool separate_io_proj = false); 516 517 // Create a LoadNode, reading from the parser's memory state. 518 // (Note: require_atomic_access is useful only with T_LONG.) 519 // 520 // We choose the unordered semantics by default because we have 521 // adapted the `do_put_xxx' and `do_get_xxx' procedures for the case 522 // of volatile fields. 523 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, 524 MemNode::MemOrd mo, bool require_atomic_access = false) { 525 // This version computes alias_index from bottom_type 526 return make_load(ctl, adr, t, bt, adr->bottom_type()->is_ptr(), 527 mo, require_atomic_access); 528 } 529 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, const TypePtr* adr_type, 530 MemNode::MemOrd mo, bool require_atomic_access = false) { 531 // This version computes alias_index from an address type 532 assert(adr_type != NULL, "use other make_load factory"); 533 return make_load(ctl, adr, t, bt, C->get_alias_index(adr_type), 534 mo, require_atomic_access); 535 } 536 // This is the base version which is given an alias index. 537 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, int adr_idx, 538 MemNode::MemOrd mo, bool require_atomic_access = false); 539 540 // Create & transform a StoreNode and store the effect into the 541 // parser's memory state. 542 // 543 // We must ensure that stores of object references will be visible 544 // only after the object's initialization. So the clients of this 545 // procedure must indicate that the store requires `release' 546 // semantics, if the stored value is an object reference that might 547 // point to a new object and may become externally visible. 548 Node* store_to_memory(Node* ctl, Node* adr, Node* val, BasicType bt, 549 const TypePtr* adr_type, 550 MemNode::MemOrd mo, 551 bool require_atomic_access = false) { 552 // This version computes alias_index from an address type 553 assert(adr_type != NULL, "use other store_to_memory factory"); 554 return store_to_memory(ctl, adr, val, bt, 555 C->get_alias_index(adr_type), 556 mo, require_atomic_access); 557 } 558 // This is the base version which is given alias index 559 // Return the new StoreXNode 560 Node* store_to_memory(Node* ctl, Node* adr, Node* val, BasicType bt, 561 int adr_idx, 562 MemNode::MemOrd, 563 bool require_atomic_access = false); 564 565 566 // All in one pre-barrier, store, post_barrier 567 // Insert a write-barrier'd store. This is to let generational GC 568 // work; we have to flag all oop-stores before the next GC point. 569 // 570 // It comes in 3 flavors of store to an object, array, or unknown. 571 // We use precise card marks for arrays to avoid scanning the entire 572 // array. We use imprecise for object. We use precise for unknown 573 // since we don't know if we have an array or and object or even 574 // where the object starts. 575 // 576 // If val==NULL, it is taken to be a completely unknown value. QQQ 577 578 Node* store_oop(Node* ctl, 579 Node* obj, // containing obj 580 Node* adr, // actual adress to store val at 581 const TypePtr* adr_type, 582 Node* val, 583 const TypeOopPtr* val_type, 584 BasicType bt, 585 bool use_precise, 586 MemNode::MemOrd mo); 587 588 Node* store_oop_to_object(Node* ctl, 589 Node* obj, // containing obj 590 Node* adr, // actual adress to store val at 591 const TypePtr* adr_type, 592 Node* val, 593 const TypeOopPtr* val_type, 594 BasicType bt, 595 MemNode::MemOrd mo) { 596 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, false, mo); 597 } 598 599 Node* store_oop_to_array(Node* ctl, 600 Node* obj, // containing obj 601 Node* adr, // actual adress to store val at 602 const TypePtr* adr_type, 603 Node* val, 604 const TypeOopPtr* val_type, 605 BasicType bt, 606 MemNode::MemOrd mo) { 607 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true, mo); 608 } 609 610 // Could be an array or object we don't know at compile time (unsafe ref.) 611 Node* store_oop_to_unknown(Node* ctl, 612 Node* obj, // containing obj 613 Node* adr, // actual adress to store val at 614 const TypePtr* adr_type, 615 Node* val, 616 BasicType bt, 617 MemNode::MemOrd mo); 618 619 // For the few case where the barriers need special help 620 void pre_barrier(bool do_load, Node* ctl, 621 Node* obj, Node* adr, uint adr_idx, Node* val, const TypeOopPtr* val_type, 622 Node* pre_val, 623 BasicType bt); 624 625 void post_barrier(Node* ctl, Node* store, Node* obj, Node* adr, uint adr_idx, 626 Node* val, BasicType bt, bool use_precise); 627 628 // Return addressing for an array element. 629 Node* array_element_address(Node* ary, Node* idx, BasicType elembt, 630 // Optional constraint on the array size: 631 const TypeInt* sizetype = NULL); 632 633 // Return a load of array element at idx. 634 Node* load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype); 635 636 //---------------- Dtrace support -------------------- 637 void make_dtrace_method_entry_exit(ciMethod* method, bool is_entry); 638 void make_dtrace_method_entry(ciMethod* method) { 639 make_dtrace_method_entry_exit(method, true); 640 } 641 void make_dtrace_method_exit(ciMethod* method) { 642 make_dtrace_method_entry_exit(method, false); 643 } 644 645 //--------------- stub generation ------------------- 646 public: 647 void gen_stub(address C_function, 648 const char *name, 649 int is_fancy_jump, 650 bool pass_tls, 651 bool return_pc); 652 653 //---------- help for generating calls -------------- 654 655 // Do a null check on the receiver as it would happen before the call to 656 // callee (with all arguments still on the stack). 657 Node* null_check_receiver_before_call(ciMethod* callee) { 658 assert(!callee->is_static(), "must be a virtual method"); 659 const int nargs = callee->arg_size(); 660 inc_sp(nargs); 661 Node* n = null_check_receiver(); 662 dec_sp(nargs); 663 return n; 664 } 665 666 // Fill in argument edges for the call from argument(0), argument(1), ... 667 // (The next step is to call set_edges_for_java_call.) 668 void set_arguments_for_java_call(CallJavaNode* call); 669 670 // Fill in non-argument edges for the call. 671 // Transform the call, and update the basics: control, i_o, memory. 672 // (The next step is usually to call set_results_for_java_call.) 673 void set_edges_for_java_call(CallJavaNode* call, 674 bool must_throw = false, bool separate_io_proj = false); 675 676 // Finish up a java call that was started by set_edges_for_java_call. 677 // Call add_exception on any throw arising from the call. 678 // Return the call result (transformed). 679 Node* set_results_for_java_call(CallJavaNode* call, bool separate_io_proj = false); 680 681 // Similar to set_edges_for_java_call, but simplified for runtime calls. 682 void set_predefined_output_for_runtime_call(Node* call) { 683 set_predefined_output_for_runtime_call(call, NULL, NULL); 684 } 685 void set_predefined_output_for_runtime_call(Node* call, 686 Node* keep_mem, 687 const TypePtr* hook_mem); 688 Node* set_predefined_input_for_runtime_call(SafePointNode* call); 689 690 // Replace the call with the current state of the kit. Requires 691 // that the call was generated with separate io_projs so that 692 // exceptional control flow can be handled properly. 693 void replace_call(CallNode* call, Node* result); 694 695 // helper functions for statistics 696 void increment_counter(address counter_addr); // increment a debug counter 697 void increment_counter(Node* counter_addr); // increment a debug counter 698 699 // Bail out to the interpreter right now 700 // The optional klass is the one causing the trap. 701 // The optional reason is debug information written to the compile log. 702 // Optional must_throw is the same as with add_safepoint_edges. 703 void uncommon_trap(int trap_request, 704 ciKlass* klass = NULL, const char* reason_string = NULL, 705 bool must_throw = false, bool keep_exact_action = false); 706 707 // Shorthand, to avoid saying "Deoptimization::" so many times. 708 void uncommon_trap(Deoptimization::DeoptReason reason, 709 Deoptimization::DeoptAction action, 710 ciKlass* klass = NULL, const char* reason_string = NULL, 711 bool must_throw = false, bool keep_exact_action = false) { 712 uncommon_trap(Deoptimization::make_trap_request(reason, action), 713 klass, reason_string, must_throw, keep_exact_action); 714 } 715 716 // SP when bytecode needs to be reexecuted. 717 virtual int reexecute_sp() { return sp(); } 718 719 // Report if there were too many traps at the current method and bci. 720 // Report if a trap was recorded, and/or PerMethodTrapLimit was exceeded. 721 // If there is no MDO at all, report no trap unless told to assume it. 722 bool too_many_traps(Deoptimization::DeoptReason reason) { 723 return C->too_many_traps(method(), bci(), reason); 724 } 725 726 // Report if there were too many recompiles at the current method and bci. 727 bool too_many_recompiles(Deoptimization::DeoptReason reason) { 728 return C->too_many_recompiles(method(), bci(), reason); 729 } 730 731 // Returns the object (if any) which was created the moment before. 732 Node* just_allocated_object(Node* current_control); 733 734 static bool use_ReduceInitialCardMarks() { 735 return (ReduceInitialCardMarks 736 && Universe::heap()->can_elide_tlab_store_barriers()); 737 } 738 739 // Sync Ideal and Graph kits. 740 void sync_kit(IdealKit& ideal); 741 void final_sync(IdealKit& ideal); 742 743 // vanilla/CMS post barrier 744 void write_barrier_post(Node *store, Node* obj, 745 Node* adr, uint adr_idx, Node* val, bool use_precise); 746 747 // Allow reordering of pre-barrier with oop store and/or post-barrier. 748 // Used for load_store operations which loads old value. 749 bool can_move_pre_barrier() const; 750 751 // G1 pre/post barriers 752 void g1_write_barrier_pre(bool do_load, 753 Node* obj, 754 Node* adr, 755 uint alias_idx, 756 Node* val, 757 const TypeOopPtr* val_type, 758 Node* pre_val, 759 BasicType bt); 760 761 void g1_write_barrier_post(Node* store, 762 Node* obj, 763 Node* adr, 764 uint alias_idx, 765 Node* val, 766 BasicType bt, 767 bool use_precise); 768 // Helper function for g1 769 private: 770 void g1_mark_card(IdealKit& ideal, Node* card_adr, Node* store, uint oop_alias_idx, 771 Node* index, Node* index_adr, 772 Node* buffer, const TypeFunc* tf); 773 774 public: 775 // Helper function to round double arguments before a call 776 void round_double_arguments(ciMethod* dest_method); 777 void round_double_result(ciMethod* dest_method); 778 779 // rounding for strict float precision conformance 780 Node* precision_rounding(Node* n); 781 782 // rounding for strict double precision conformance 783 Node* dprecision_rounding(Node* n); 784 785 // rounding for non-strict double stores 786 Node* dstore_rounding(Node* n); 787 788 // Helper functions for fast/slow path codes 789 Node* opt_iff(Node* region, Node* iff); 790 Node* make_runtime_call(int flags, 791 const TypeFunc* call_type, address call_addr, 792 const char* call_name, 793 const TypePtr* adr_type, // NULL if no memory effects 794 Node* parm0 = NULL, Node* parm1 = NULL, 795 Node* parm2 = NULL, Node* parm3 = NULL, 796 Node* parm4 = NULL, Node* parm5 = NULL, 797 Node* parm6 = NULL, Node* parm7 = NULL); 798 enum { // flag values for make_runtime_call 799 RC_NO_FP = 1, // CallLeafNoFPNode 800 RC_NO_IO = 2, // do not hook IO edges 801 RC_NO_LEAF = 4, // CallStaticJavaNode 802 RC_MUST_THROW = 8, // flag passed to add_safepoint_edges 803 RC_NARROW_MEM = 16, // input memory is same as output 804 RC_UNCOMMON = 32, // freq. expected to be like uncommon trap 805 RC_LEAF = 0 // null value: no flags set 806 }; 807 808 // merge in all memory slices from new_mem, along the given path 809 void merge_memory(Node* new_mem, Node* region, int new_path); 810 void make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj); 811 812 // Helper functions to build synchronizations 813 int next_monitor(); 814 Node* insert_mem_bar(int opcode, Node* precedent = NULL); 815 Node* insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent = NULL); 816 // Optional 'precedent' is appended as an extra edge, to force ordering. 817 FastLockNode* shared_lock(Node* obj); 818 void shared_unlock(Node* box, Node* obj); 819 820 // helper functions for the fast path/slow path idioms 821 Node* fast_and_slow(Node* in, const Type *result_type, Node* null_result, IfNode* fast_test, Node* fast_result, address slow_call, const TypeFunc *slow_call_type, Node* slow_arg, Klass* ex_klass, Node* slow_result); 822 823 // Generate an instance-of idiom. Used by both the instance-of bytecode 824 // and the reflective instance-of call. 825 Node* gen_instanceof(Node *subobj, Node* superkls, bool safe_for_replace = false); 826 827 // Generate a check-cast idiom. Used by both the check-cast bytecode 828 // and the array-store bytecode 829 Node* gen_checkcast( Node *subobj, Node* superkls, 830 Node* *failure_control = NULL ); 831 832 // Generate a subtyping check. Takes as input the subtype and supertype. 833 // Returns 2 values: sets the default control() to the true path and 834 // returns the false path. Only reads from constant memory taken from the 835 // default memory; does not write anything. It also doesn't take in an 836 // Object; if you wish to check an Object you need to load the Object's 837 // class prior to coming here. 838 Node* gen_subtype_check(Node* subklass, Node* superklass); 839 840 // Static parse-time type checking logic for gen_subtype_check: 841 enum { SSC_always_false, SSC_always_true, SSC_easy_test, SSC_full_test }; 842 int static_subtype_check(ciKlass* superk, ciKlass* subk); 843 844 // Exact type check used for predicted calls and casts. 845 // Rewrites (*casted_receiver) to be casted to the stronger type. 846 // (Caller is responsible for doing replace_in_map.) 847 Node* type_check_receiver(Node* receiver, ciKlass* klass, float prob, 848 Node* *casted_receiver); 849 850 // implementation of object creation 851 Node* set_output_for_allocation(AllocateNode* alloc, 852 const TypeOopPtr* oop_type); 853 Node* get_layout_helper(Node* klass_node, jint& constant_value); 854 Node* new_instance(Node* klass_node, 855 Node* slow_test = NULL, 856 Node* *return_size_val = NULL); 857 Node* new_array(Node* klass_node, Node* count_val, int nargs, 858 Node* *return_size_val = NULL); 859 860 // java.lang.String helpers 861 Node* load_String_offset(Node* ctrl, Node* str); 862 Node* load_String_length(Node* ctrl, Node* str); 863 Node* load_String_value(Node* ctrl, Node* str); 864 void store_String_offset(Node* ctrl, Node* str, Node* value); 865 void store_String_length(Node* ctrl, Node* str, Node* value); 866 void store_String_value(Node* ctrl, Node* str, Node* value); 867 868 // Handy for making control flow 869 IfNode* create_and_map_if(Node* ctrl, Node* tst, float prob, float cnt) { 870 IfNode* iff = new (C) IfNode(ctrl, tst, prob, cnt);// New IfNode's 871 _gvn.set_type(iff, iff->Value(&_gvn)); // Value may be known at parse-time 872 // Place 'if' on worklist if it will be in graph 873 if (!tst->is_Con()) record_for_igvn(iff); // Range-check and Null-check removal is later 874 return iff; 875 } 876 877 IfNode* create_and_xform_if(Node* ctrl, Node* tst, float prob, float cnt) { 878 IfNode* iff = new (C) IfNode(ctrl, tst, prob, cnt);// New IfNode's 879 _gvn.transform(iff); // Value may be known at parse-time 880 // Place 'if' on worklist if it will be in graph 881 if (!tst->is_Con()) record_for_igvn(iff); // Range-check and Null-check removal is later 882 return iff; 883 } 884 885 // Insert a loop predicate into the graph 886 void add_predicate(int nargs = 0); 887 void add_predicate_impl(Deoptimization::DeoptReason reason, int nargs); 888 889 // Produce new array node of stable type 890 Node* cast_array_to_stable(Node* ary, const TypeAryPtr* ary_type); 891 }; 892 893 // Helper class to support building of control flow branches. Upon 894 // creation the map and sp at bci are cloned and restored upon de- 895 // struction. Typical use: 896 // 897 // { PreserveJVMState pjvms(this); 898 // // code of new branch 899 // } 900 // // here the JVM state at bci is established 901 902 class PreserveJVMState: public StackObj { 903 protected: 904 GraphKit* _kit; 905 #ifdef ASSERT 906 int _block; // PO of current block, if a Parse 907 int _bci; 908 #endif 909 SafePointNode* _map; 910 uint _sp; 911 912 public: 913 PreserveJVMState(GraphKit* kit, bool clone_map = true); 914 ~PreserveJVMState(); 915 }; 916 917 // Helper class to build cutouts of the form if (p) ; else {x...}. 918 // The code {x...} must not fall through. 919 // The kit's main flow of control is set to the "then" continuation of if(p). 920 class BuildCutout: public PreserveJVMState { 921 public: 922 BuildCutout(GraphKit* kit, Node* p, float prob, float cnt = COUNT_UNKNOWN); 923 ~BuildCutout(); 924 }; 925 926 // Helper class to preserve the original _reexecute bit and _sp and restore 927 // them back 928 class PreserveReexecuteState: public StackObj { 929 protected: 930 GraphKit* _kit; 931 uint _sp; 932 JVMState::ReexecuteState _reexecute; 933 934 public: 935 PreserveReexecuteState(GraphKit* kit); 936 ~PreserveReexecuteState(); 937 }; 938 939 #endif // SHARE_VM_OPTO_GRAPHKIT_HPP