1 /* 2 * Copyright (c) 1998, 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 "ci/ciMethodData.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "compiler/compileLog.hpp" 30 #include "interpreter/linkResolver.hpp" 31 #include "memory/universe.inline.hpp" 32 #include "opto/addnode.hpp" 33 #include "opto/castnode.hpp" 34 #include "opto/convertnode.hpp" 35 #include "opto/divnode.hpp" 36 #include "opto/idealGraphPrinter.hpp" 37 #include "opto/matcher.hpp" 38 #include "opto/memnode.hpp" 39 #include "opto/mulnode.hpp" 40 #include "opto/opaquenode.hpp" 41 #include "opto/parse.hpp" 42 #include "opto/runtime.hpp" 43 #include "runtime/deoptimization.hpp" 44 #include "runtime/sharedRuntime.hpp" 45 46 extern int explicit_null_checks_inserted, 47 explicit_null_checks_elided; 48 49 //---------------------------------array_load---------------------------------- 50 void Parse::array_load(BasicType elem_type) { 51 const Type* elem = Type::TOP; 52 Node* adr = array_addressing(elem_type, 0, &elem); 53 if (stopped()) return; // guaranteed null or range check 54 dec_sp(2); // Pop array and index 55 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(elem_type); 56 Node* ld = make_load(control(), adr, elem, elem_type, adr_type, MemNode::unordered); 57 push(ld); 58 } 59 60 61 //--------------------------------array_store---------------------------------- 62 void Parse::array_store(BasicType elem_type) { 63 Node* adr = array_addressing(elem_type, 1); 64 if (stopped()) return; // guaranteed null or range check 65 Node* val = pop(); 66 dec_sp(2); // Pop array and index 67 const TypeAryPtr* adr_type = TypeAryPtr::get_array_body_type(elem_type); 68 store_to_memory(control(), adr, val, elem_type, adr_type, StoreNode::release_if_reference(elem_type)); 69 } 70 71 72 //------------------------------array_addressing------------------------------- 73 // Pull array and index from the stack. Compute pointer-to-element. 74 Node* Parse::array_addressing(BasicType type, int vals, const Type* *result2) { 75 Node *idx = peek(0+vals); // Get from stack without popping 76 Node *ary = peek(1+vals); // in case of exception 77 78 // Null check the array base, with correct stack contents 79 ary = null_check(ary, T_ARRAY); 80 // Compile-time detect of null-exception? 81 if (stopped()) return top(); 82 83 const TypeAryPtr* arytype = _gvn.type(ary)->is_aryptr(); 84 const TypeInt* sizetype = arytype->size(); 85 const Type* elemtype = arytype->elem(); 86 87 if (UseUniqueSubclasses && result2 != NULL) { 88 const Type* el = elemtype->make_ptr(); 89 if (el && el->isa_instptr()) { 90 const TypeInstPtr* toop = el->is_instptr(); 91 if (toop->klass()->as_instance_klass()->unique_concrete_subklass()) { 92 // If we load from "AbstractClass[]" we must see "ConcreteSubClass". 93 const Type* subklass = Type::get_const_type(toop->klass()); 94 elemtype = subklass->join_speculative(el); 95 } 96 } 97 } 98 99 // Check for big class initializers with all constant offsets 100 // feeding into a known-size array. 101 const TypeInt* idxtype = _gvn.type(idx)->is_int(); 102 // See if the highest idx value is less than the lowest array bound, 103 // and if the idx value cannot be negative: 104 bool need_range_check = true; 105 if (idxtype->_hi < sizetype->_lo && idxtype->_lo >= 0) { 106 need_range_check = false; 107 if (C->log() != NULL) C->log()->elem("observe that='!need_range_check'"); 108 } 109 110 ciKlass * arytype_klass = arytype->klass(); 111 if ((arytype_klass != NULL) && (!arytype_klass->is_loaded())) { 112 // Only fails for some -Xcomp runs 113 // The class is unloaded. We have to run this bytecode in the interpreter. 114 uncommon_trap(Deoptimization::Reason_unloaded, 115 Deoptimization::Action_reinterpret, 116 arytype->klass(), "!loaded array"); 117 return top(); 118 } 119 120 // Do the range check 121 if (GenerateRangeChecks && need_range_check) { 122 Node* tst; 123 if (sizetype->_hi <= 0) { 124 // The greatest array bound is negative, so we can conclude that we're 125 // compiling unreachable code, but the unsigned compare trick used below 126 // only works with non-negative lengths. Instead, hack "tst" to be zero so 127 // the uncommon_trap path will always be taken. 128 tst = _gvn.intcon(0); 129 } else { 130 // Range is constant in array-oop, so we can use the original state of mem 131 Node* len = load_array_length(ary); 132 133 // Test length vs index (standard trick using unsigned compare) 134 Node* chk = _gvn.transform( new CmpUNode(idx, len) ); 135 BoolTest::mask btest = BoolTest::lt; 136 tst = _gvn.transform( new BoolNode(chk, btest) ); 137 } 138 // Branch to failure if out of bounds 139 { BuildCutout unless(this, tst, PROB_MAX); 140 if (C->allow_range_check_smearing()) { 141 // Do not use builtin_throw, since range checks are sometimes 142 // made more stringent by an optimistic transformation. 143 // This creates "tentative" range checks at this point, 144 // which are not guaranteed to throw exceptions. 145 // See IfNode::Ideal, is_range_check, adjust_check. 146 uncommon_trap(Deoptimization::Reason_range_check, 147 Deoptimization::Action_make_not_entrant, 148 NULL, "range_check"); 149 } else { 150 // If we have already recompiled with the range-check-widening 151 // heroic optimization turned off, then we must really be throwing 152 // range check exceptions. 153 builtin_throw(Deoptimization::Reason_range_check, idx); 154 } 155 } 156 } 157 // Check for always knowing you are throwing a range-check exception 158 if (stopped()) return top(); 159 160 Node* ptr = array_element_address(ary, idx, type, sizetype); 161 162 if (result2 != NULL) *result2 = elemtype; 163 164 assert(ptr != top(), "top should go hand-in-hand with stopped"); 165 166 return ptr; 167 } 168 169 170 // returns IfNode 171 IfNode* Parse::jump_if_fork_int(Node* a, Node* b, BoolTest::mask mask) { 172 Node *cmp = _gvn.transform( new CmpINode( a, b)); // two cases: shiftcount > 32 and shiftcount <= 32 173 Node *tst = _gvn.transform( new BoolNode( cmp, mask)); 174 IfNode *iff = create_and_map_if( control(), tst, ((mask == BoolTest::eq) ? PROB_STATIC_INFREQUENT : PROB_FAIR), COUNT_UNKNOWN ); 175 return iff; 176 } 177 178 // return Region node 179 Node* Parse::jump_if_join(Node* iffalse, Node* iftrue) { 180 Node *region = new RegionNode(3); // 2 results 181 record_for_igvn(region); 182 region->init_req(1, iffalse); 183 region->init_req(2, iftrue ); 184 _gvn.set_type(region, Type::CONTROL); 185 region = _gvn.transform(region); 186 set_control (region); 187 return region; 188 } 189 190 191 //------------------------------helper for tableswitch------------------------- 192 void Parse::jump_if_true_fork(IfNode *iff, int dest_bci_if_true, int prof_table_index) { 193 // True branch, use existing map info 194 { PreserveJVMState pjvms(this); 195 Node *iftrue = _gvn.transform( new IfTrueNode (iff) ); 196 set_control( iftrue ); 197 profile_switch_case(prof_table_index); 198 merge_new_path(dest_bci_if_true); 199 } 200 201 // False branch 202 Node *iffalse = _gvn.transform( new IfFalseNode(iff) ); 203 set_control( iffalse ); 204 } 205 206 void Parse::jump_if_false_fork(IfNode *iff, int dest_bci_if_true, int prof_table_index) { 207 // True branch, use existing map info 208 { PreserveJVMState pjvms(this); 209 Node *iffalse = _gvn.transform( new IfFalseNode (iff) ); 210 set_control( iffalse ); 211 profile_switch_case(prof_table_index); 212 merge_new_path(dest_bci_if_true); 213 } 214 215 // False branch 216 Node *iftrue = _gvn.transform( new IfTrueNode(iff) ); 217 set_control( iftrue ); 218 } 219 220 void Parse::jump_if_always_fork(int dest_bci, int prof_table_index) { 221 // False branch, use existing map and control() 222 profile_switch_case(prof_table_index); 223 merge_new_path(dest_bci); 224 } 225 226 227 extern "C" { 228 static int jint_cmp(const void *i, const void *j) { 229 int a = *(jint *)i; 230 int b = *(jint *)j; 231 return a > b ? 1 : a < b ? -1 : 0; 232 } 233 } 234 235 236 // Default value for methodData switch indexing. Must be a negative value to avoid 237 // conflict with any legal switch index. 238 #define NullTableIndex -1 239 240 class SwitchRange : public StackObj { 241 // a range of integers coupled with a bci destination 242 jint _lo; // inclusive lower limit 243 jint _hi; // inclusive upper limit 244 int _dest; 245 int _table_index; // index into method data table 246 247 public: 248 jint lo() const { return _lo; } 249 jint hi() const { return _hi; } 250 int dest() const { return _dest; } 251 int table_index() const { return _table_index; } 252 bool is_singleton() const { return _lo == _hi; } 253 254 void setRange(jint lo, jint hi, int dest, int table_index) { 255 assert(lo <= hi, "must be a non-empty range"); 256 _lo = lo, _hi = hi; _dest = dest; _table_index = table_index; 257 } 258 bool adjoinRange(jint lo, jint hi, int dest, int table_index) { 259 assert(lo <= hi, "must be a non-empty range"); 260 if (lo == _hi+1 && dest == _dest && table_index == _table_index) { 261 _hi = hi; 262 return true; 263 } 264 return false; 265 } 266 267 void set (jint value, int dest, int table_index) { 268 setRange(value, value, dest, table_index); 269 } 270 bool adjoin(jint value, int dest, int table_index) { 271 return adjoinRange(value, value, dest, table_index); 272 } 273 274 void print() { 275 if (is_singleton()) 276 tty->print(" {%d}=>%d", lo(), dest()); 277 else if (lo() == min_jint) 278 tty->print(" {..%d}=>%d", hi(), dest()); 279 else if (hi() == max_jint) 280 tty->print(" {%d..}=>%d", lo(), dest()); 281 else 282 tty->print(" {%d..%d}=>%d", lo(), hi(), dest()); 283 } 284 }; 285 286 287 //-------------------------------do_tableswitch-------------------------------- 288 void Parse::do_tableswitch() { 289 Node* lookup = pop(); 290 291 // Get information about tableswitch 292 int default_dest = iter().get_dest_table(0); 293 int lo_index = iter().get_int_table(1); 294 int hi_index = iter().get_int_table(2); 295 int len = hi_index - lo_index + 1; 296 297 if (len < 1) { 298 // If this is a backward branch, add safepoint 299 maybe_add_safepoint(default_dest); 300 merge(default_dest); 301 return; 302 } 303 304 // generate decision tree, using trichotomy when possible 305 int rnum = len+2; 306 bool makes_backward_branch = false; 307 SwitchRange* ranges = NEW_RESOURCE_ARRAY(SwitchRange, rnum); 308 int rp = -1; 309 if (lo_index != min_jint) { 310 ranges[++rp].setRange(min_jint, lo_index-1, default_dest, NullTableIndex); 311 } 312 for (int j = 0; j < len; j++) { 313 jint match_int = lo_index+j; 314 int dest = iter().get_dest_table(j+3); 315 makes_backward_branch |= (dest <= bci()); 316 int table_index = method_data_update() ? j : NullTableIndex; 317 if (rp < 0 || !ranges[rp].adjoin(match_int, dest, table_index)) { 318 ranges[++rp].set(match_int, dest, table_index); 319 } 320 } 321 jint highest = lo_index+(len-1); 322 assert(ranges[rp].hi() == highest, ""); 323 if (highest != max_jint 324 && !ranges[rp].adjoinRange(highest+1, max_jint, default_dest, NullTableIndex)) { 325 ranges[++rp].setRange(highest+1, max_jint, default_dest, NullTableIndex); 326 } 327 assert(rp < len+2, "not too many ranges"); 328 329 // Safepoint in case if backward branch observed 330 if( makes_backward_branch && UseLoopSafepoints ) 331 add_safepoint(); 332 333 jump_switch_ranges(lookup, &ranges[0], &ranges[rp]); 334 } 335 336 337 //------------------------------do_lookupswitch-------------------------------- 338 void Parse::do_lookupswitch() { 339 Node *lookup = pop(); // lookup value 340 // Get information about lookupswitch 341 int default_dest = iter().get_dest_table(0); 342 int len = iter().get_int_table(1); 343 344 if (len < 1) { // If this is a backward branch, add safepoint 345 maybe_add_safepoint(default_dest); 346 merge(default_dest); 347 return; 348 } 349 350 // generate decision tree, using trichotomy when possible 351 jint* table = NEW_RESOURCE_ARRAY(jint, len*2); 352 { 353 for( int j = 0; j < len; j++ ) { 354 table[j+j+0] = iter().get_int_table(2+j+j); 355 table[j+j+1] = iter().get_dest_table(2+j+j+1); 356 } 357 qsort( table, len, 2*sizeof(table[0]), jint_cmp ); 358 } 359 360 int rnum = len*2+1; 361 bool makes_backward_branch = false; 362 SwitchRange* ranges = NEW_RESOURCE_ARRAY(SwitchRange, rnum); 363 int rp = -1; 364 for( int j = 0; j < len; j++ ) { 365 jint match_int = table[j+j+0]; 366 int dest = table[j+j+1]; 367 int next_lo = rp < 0 ? min_jint : ranges[rp].hi()+1; 368 int table_index = method_data_update() ? j : NullTableIndex; 369 makes_backward_branch |= (dest <= bci()); 370 if( match_int != next_lo ) { 371 ranges[++rp].setRange(next_lo, match_int-1, default_dest, NullTableIndex); 372 } 373 if( rp < 0 || !ranges[rp].adjoin(match_int, dest, table_index) ) { 374 ranges[++rp].set(match_int, dest, table_index); 375 } 376 } 377 jint highest = table[2*(len-1)]; 378 assert(ranges[rp].hi() == highest, ""); 379 if( highest != max_jint 380 && !ranges[rp].adjoinRange(highest+1, max_jint, default_dest, NullTableIndex) ) { 381 ranges[++rp].setRange(highest+1, max_jint, default_dest, NullTableIndex); 382 } 383 assert(rp < rnum, "not too many ranges"); 384 385 // Safepoint in case backward branch observed 386 if( makes_backward_branch && UseLoopSafepoints ) 387 add_safepoint(); 388 389 jump_switch_ranges(lookup, &ranges[0], &ranges[rp]); 390 } 391 392 //----------------------------create_jump_tables------------------------------- 393 bool Parse::create_jump_tables(Node* key_val, SwitchRange* lo, SwitchRange* hi) { 394 // Are jumptables enabled 395 if (!UseJumpTables) return false; 396 397 // Are jumptables supported 398 if (!Matcher::has_match_rule(Op_Jump)) return false; 399 400 // Don't make jump table if profiling 401 if (method_data_update()) return false; 402 403 // Decide if a guard is needed to lop off big ranges at either (or 404 // both) end(s) of the input set. We'll call this the default target 405 // even though we can't be sure that it is the true "default". 406 407 bool needs_guard = false; 408 int default_dest; 409 int64_t total_outlier_size = 0; 410 int64_t hi_size = ((int64_t)hi->hi()) - ((int64_t)hi->lo()) + 1; 411 int64_t lo_size = ((int64_t)lo->hi()) - ((int64_t)lo->lo()) + 1; 412 413 if (lo->dest() == hi->dest()) { 414 total_outlier_size = hi_size + lo_size; 415 default_dest = lo->dest(); 416 } else if (lo_size > hi_size) { 417 total_outlier_size = lo_size; 418 default_dest = lo->dest(); 419 } else { 420 total_outlier_size = hi_size; 421 default_dest = hi->dest(); 422 } 423 424 // If a guard test will eliminate very sparse end ranges, then 425 // it is worth the cost of an extra jump. 426 if (total_outlier_size > (MaxJumpTableSparseness * 4)) { 427 needs_guard = true; 428 if (default_dest == lo->dest()) lo++; 429 if (default_dest == hi->dest()) hi--; 430 } 431 432 // Find the total number of cases and ranges 433 int64_t num_cases = ((int64_t)hi->hi()) - ((int64_t)lo->lo()) + 1; 434 int num_range = hi - lo + 1; 435 436 // Don't create table if: too large, too small, or too sparse. 437 if (num_cases < MinJumpTableSize || num_cases > MaxJumpTableSize) 438 return false; 439 if (num_cases > (MaxJumpTableSparseness * num_range)) 440 return false; 441 442 // Normalize table lookups to zero 443 int lowval = lo->lo(); 444 key_val = _gvn.transform( new SubINode(key_val, _gvn.intcon(lowval)) ); 445 446 // Generate a guard to protect against input keyvals that aren't 447 // in the switch domain. 448 if (needs_guard) { 449 Node* size = _gvn.intcon(num_cases); 450 Node* cmp = _gvn.transform( new CmpUNode(key_val, size) ); 451 Node* tst = _gvn.transform( new BoolNode(cmp, BoolTest::ge) ); 452 IfNode* iff = create_and_map_if( control(), tst, PROB_FAIR, COUNT_UNKNOWN); 453 jump_if_true_fork(iff, default_dest, NullTableIndex); 454 } 455 456 // Create an ideal node JumpTable that has projections 457 // of all possible ranges for a switch statement 458 // The key_val input must be converted to a pointer offset and scaled. 459 // Compare Parse::array_addressing above. 460 #ifdef _LP64 461 // Clean the 32-bit int into a real 64-bit offset. 462 // Otherwise, the jint value 0 might turn into an offset of 0x0800000000. 463 const TypeLong* lkeytype = TypeLong::make(CONST64(0), num_cases-1, Type::WidenMin); 464 key_val = _gvn.transform( new ConvI2LNode(key_val, lkeytype) ); 465 #endif 466 // Shift the value by wordsize so we have an index into the table, rather 467 // than a switch value 468 Node *shiftWord = _gvn.MakeConX(wordSize); 469 key_val = _gvn.transform( new MulXNode( key_val, shiftWord)); 470 471 // Create the JumpNode 472 Node* jtn = _gvn.transform( new JumpNode(control(), key_val, num_cases) ); 473 474 // These are the switch destinations hanging off the jumpnode 475 int i = 0; 476 for (SwitchRange* r = lo; r <= hi; r++) { 477 for (int64_t j = r->lo(); j <= r->hi(); j++, i++) { 478 Node* input = _gvn.transform(new JumpProjNode(jtn, i, r->dest(), (int)(j - lowval))); 479 { 480 PreserveJVMState pjvms(this); 481 set_control(input); 482 jump_if_always_fork(r->dest(), r->table_index()); 483 } 484 } 485 } 486 assert(i == num_cases, "miscount of cases"); 487 stop_and_kill_map(); // no more uses for this JVMS 488 return true; 489 } 490 491 //----------------------------jump_switch_ranges------------------------------- 492 void Parse::jump_switch_ranges(Node* key_val, SwitchRange *lo, SwitchRange *hi, int switch_depth) { 493 Block* switch_block = block(); 494 495 if (switch_depth == 0) { 496 // Do special processing for the top-level call. 497 assert(lo->lo() == min_jint, "initial range must exhaust Type::INT"); 498 assert(hi->hi() == max_jint, "initial range must exhaust Type::INT"); 499 500 // Decrement pred-numbers for the unique set of nodes. 501 #ifdef ASSERT 502 // Ensure that the block's successors are a (duplicate-free) set. 503 int successors_counted = 0; // block occurrences in [hi..lo] 504 int unique_successors = switch_block->num_successors(); 505 for (int i = 0; i < unique_successors; i++) { 506 Block* target = switch_block->successor_at(i); 507 508 // Check that the set of successors is the same in both places. 509 int successors_found = 0; 510 for (SwitchRange* p = lo; p <= hi; p++) { 511 if (p->dest() == target->start()) successors_found++; 512 } 513 assert(successors_found > 0, "successor must be known"); 514 successors_counted += successors_found; 515 } 516 assert(successors_counted == (hi-lo)+1, "no unexpected successors"); 517 #endif 518 519 // Maybe prune the inputs, based on the type of key_val. 520 jint min_val = min_jint; 521 jint max_val = max_jint; 522 const TypeInt* ti = key_val->bottom_type()->isa_int(); 523 if (ti != NULL) { 524 min_val = ti->_lo; 525 max_val = ti->_hi; 526 assert(min_val <= max_val, "invalid int type"); 527 } 528 while (lo->hi() < min_val) lo++; 529 if (lo->lo() < min_val) lo->setRange(min_val, lo->hi(), lo->dest(), lo->table_index()); 530 while (hi->lo() > max_val) hi--; 531 if (hi->hi() > max_val) hi->setRange(hi->lo(), max_val, hi->dest(), hi->table_index()); 532 } 533 534 #ifndef PRODUCT 535 if (switch_depth == 0) { 536 _max_switch_depth = 0; 537 _est_switch_depth = log2_intptr((hi-lo+1)-1)+1; 538 } 539 #endif 540 541 assert(lo <= hi, "must be a non-empty set of ranges"); 542 if (lo == hi) { 543 jump_if_always_fork(lo->dest(), lo->table_index()); 544 } else { 545 assert(lo->hi() == (lo+1)->lo()-1, "contiguous ranges"); 546 assert(hi->lo() == (hi-1)->hi()+1, "contiguous ranges"); 547 548 if (create_jump_tables(key_val, lo, hi)) return; 549 550 int nr = hi - lo + 1; 551 552 SwitchRange* mid = lo + nr/2; 553 // if there is an easy choice, pivot at a singleton: 554 if (nr > 3 && !mid->is_singleton() && (mid-1)->is_singleton()) mid--; 555 556 assert(lo < mid && mid <= hi, "good pivot choice"); 557 assert(nr != 2 || mid == hi, "should pick higher of 2"); 558 assert(nr != 3 || mid == hi-1, "should pick middle of 3"); 559 560 Node *test_val = _gvn.intcon(mid->lo()); 561 562 if (mid->is_singleton()) { 563 IfNode *iff_ne = jump_if_fork_int(key_val, test_val, BoolTest::ne); 564 jump_if_false_fork(iff_ne, mid->dest(), mid->table_index()); 565 566 // Special Case: If there are exactly three ranges, and the high 567 // and low range each go to the same place, omit the "gt" test, 568 // since it will not discriminate anything. 569 bool eq_test_only = (hi == lo+2 && hi->dest() == lo->dest()); 570 if (eq_test_only) { 571 assert(mid == hi-1, ""); 572 } 573 574 // if there is a higher range, test for it and process it: 575 if (mid < hi && !eq_test_only) { 576 // two comparisons of same values--should enable 1 test for 2 branches 577 // Use BoolTest::le instead of BoolTest::gt 578 IfNode *iff_le = jump_if_fork_int(key_val, test_val, BoolTest::le); 579 Node *iftrue = _gvn.transform( new IfTrueNode(iff_le) ); 580 Node *iffalse = _gvn.transform( new IfFalseNode(iff_le) ); 581 { PreserveJVMState pjvms(this); 582 set_control(iffalse); 583 jump_switch_ranges(key_val, mid+1, hi, switch_depth+1); 584 } 585 set_control(iftrue); 586 } 587 588 } else { 589 // mid is a range, not a singleton, so treat mid..hi as a unit 590 IfNode *iff_ge = jump_if_fork_int(key_val, test_val, BoolTest::ge); 591 592 // if there is a higher range, test for it and process it: 593 if (mid == hi) { 594 jump_if_true_fork(iff_ge, mid->dest(), mid->table_index()); 595 } else { 596 Node *iftrue = _gvn.transform( new IfTrueNode(iff_ge) ); 597 Node *iffalse = _gvn.transform( new IfFalseNode(iff_ge) ); 598 { PreserveJVMState pjvms(this); 599 set_control(iftrue); 600 jump_switch_ranges(key_val, mid, hi, switch_depth+1); 601 } 602 set_control(iffalse); 603 } 604 } 605 606 // in any case, process the lower range 607 jump_switch_ranges(key_val, lo, mid-1, switch_depth+1); 608 } 609 610 // Decrease pred_count for each successor after all is done. 611 if (switch_depth == 0) { 612 int unique_successors = switch_block->num_successors(); 613 for (int i = 0; i < unique_successors; i++) { 614 Block* target = switch_block->successor_at(i); 615 // Throw away the pre-allocated path for each unique successor. 616 target->next_path_num(); 617 } 618 } 619 620 #ifndef PRODUCT 621 _max_switch_depth = MAX2(switch_depth, _max_switch_depth); 622 if (TraceOptoParse && Verbose && WizardMode && switch_depth == 0) { 623 SwitchRange* r; 624 int nsing = 0; 625 for( r = lo; r <= hi; r++ ) { 626 if( r->is_singleton() ) nsing++; 627 } 628 tty->print(">>> "); 629 _method->print_short_name(); 630 tty->print_cr(" switch decision tree"); 631 tty->print_cr(" %d ranges (%d singletons), max_depth=%d, est_depth=%d", 632 (int) (hi-lo+1), nsing, _max_switch_depth, _est_switch_depth); 633 if (_max_switch_depth > _est_switch_depth) { 634 tty->print_cr("******** BAD SWITCH DEPTH ********"); 635 } 636 tty->print(" "); 637 for( r = lo; r <= hi; r++ ) { 638 r->print(); 639 } 640 tty->cr(); 641 } 642 #endif 643 } 644 645 void Parse::modf() { 646 Node *f2 = pop(); 647 Node *f1 = pop(); 648 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::modf_Type(), 649 CAST_FROM_FN_PTR(address, SharedRuntime::frem), 650 "frem", NULL, //no memory effects 651 f1, f2); 652 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0)); 653 654 push(res); 655 } 656 657 void Parse::modd() { 658 Node *d2 = pop_pair(); 659 Node *d1 = pop_pair(); 660 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::Math_DD_D_Type(), 661 CAST_FROM_FN_PTR(address, SharedRuntime::drem), 662 "drem", NULL, //no memory effects 663 d1, top(), d2, top()); 664 Node* res_d = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0)); 665 666 #ifdef ASSERT 667 Node* res_top = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 1)); 668 assert(res_top == top(), "second value must be top"); 669 #endif 670 671 push_pair(res_d); 672 } 673 674 void Parse::l2f() { 675 Node* f2 = pop(); 676 Node* f1 = pop(); 677 Node* c = make_runtime_call(RC_LEAF, OptoRuntime::l2f_Type(), 678 CAST_FROM_FN_PTR(address, SharedRuntime::l2f), 679 "l2f", NULL, //no memory effects 680 f1, f2); 681 Node* res = _gvn.transform(new ProjNode(c, TypeFunc::Parms + 0)); 682 683 push(res); 684 } 685 686 void Parse::do_irem() { 687 // Must keep both values on the expression-stack during null-check 688 zero_check_int(peek()); 689 // Compile-time detect of null-exception? 690 if (stopped()) return; 691 692 Node* b = pop(); 693 Node* a = pop(); 694 695 const Type *t = _gvn.type(b); 696 if (t != Type::TOP) { 697 const TypeInt *ti = t->is_int(); 698 if (ti->is_con()) { 699 int divisor = ti->get_con(); 700 // check for positive power of 2 701 if (divisor > 0 && 702 (divisor & ~(divisor-1)) == divisor) { 703 // yes ! 704 Node *mask = _gvn.intcon((divisor - 1)); 705 // Sigh, must handle negative dividends 706 Node *zero = _gvn.intcon(0); 707 IfNode *ifff = jump_if_fork_int(a, zero, BoolTest::lt); 708 Node *iff = _gvn.transform( new IfFalseNode(ifff) ); 709 Node *ift = _gvn.transform( new IfTrueNode (ifff) ); 710 Node *reg = jump_if_join(ift, iff); 711 Node *phi = PhiNode::make(reg, NULL, TypeInt::INT); 712 // Negative path; negate/and/negate 713 Node *neg = _gvn.transform( new SubINode(zero, a) ); 714 Node *andn= _gvn.transform( new AndINode(neg, mask) ); 715 Node *negn= _gvn.transform( new SubINode(zero, andn) ); 716 phi->init_req(1, negn); 717 // Fast positive case 718 Node *andx = _gvn.transform( new AndINode(a, mask) ); 719 phi->init_req(2, andx); 720 // Push the merge 721 push( _gvn.transform(phi) ); 722 return; 723 } 724 } 725 } 726 // Default case 727 push( _gvn.transform( new ModINode(control(),a,b) ) ); 728 } 729 730 // Handle jsr and jsr_w bytecode 731 void Parse::do_jsr() { 732 assert(bc() == Bytecodes::_jsr || bc() == Bytecodes::_jsr_w, "wrong bytecode"); 733 734 // Store information about current state, tagged with new _jsr_bci 735 int return_bci = iter().next_bci(); 736 int jsr_bci = (bc() == Bytecodes::_jsr) ? iter().get_dest() : iter().get_far_dest(); 737 738 // Update method data 739 profile_taken_branch(jsr_bci); 740 741 // The way we do things now, there is only one successor block 742 // for the jsr, because the target code is cloned by ciTypeFlow. 743 Block* target = successor_for_bci(jsr_bci); 744 745 // What got pushed? 746 const Type* ret_addr = target->peek(); 747 assert(ret_addr->singleton(), "must be a constant (cloned jsr body)"); 748 749 // Effect on jsr on stack 750 push(_gvn.makecon(ret_addr)); 751 752 // Flow to the jsr. 753 merge(jsr_bci); 754 } 755 756 // Handle ret bytecode 757 void Parse::do_ret() { 758 // Find to whom we return. 759 assert(block()->num_successors() == 1, "a ret can only go one place now"); 760 Block* target = block()->successor_at(0); 761 assert(!target->is_ready(), "our arrival must be expected"); 762 profile_ret(target->flow()->start()); 763 int pnum = target->next_path_num(); 764 merge_common(target, pnum); 765 } 766 767 static bool has_injected_profile(BoolTest::mask btest, Node* test, int& taken, int& not_taken) { 768 ProfileBooleanNode* profile = NULL; 769 770 if (btest != BoolTest::eq && btest != BoolTest::ne) { 771 // Only ::eq and ::ne are supported for profile injection. 772 return false; 773 } 774 775 if (test->is_Cmp()) { 776 Node* n = test->in(1); 777 switch (n->Opcode()) { 778 case Op_ProfileBoolean: 779 profile = (ProfileBooleanNode*) n; 780 break; 781 case Op_AndI: 782 // Look for the following shape: AndI (ProfileBoolean) (ConI 1)) 783 const TypeInt* t = NULL; 784 if (n->in(1)->Opcode() == Op_ProfileBoolean && 785 n->in(2)->is_Con() && 786 (t = n->in(2)->bottom_type()->isa_int()) != NULL && 787 t->get_con() == 1) { 788 profile = (ProfileBooleanNode*) n->in(1); 789 } 790 break; 791 } 792 } 793 if (profile != NULL) { 794 int false_cnt = profile->false_count(); 795 int true_cnt = profile->true_count(); 796 797 // Counts matching depends on the actual test operation (::eq or ::ne). 798 taken = (btest == BoolTest::eq) ? false_cnt : true_cnt; 799 not_taken = (btest == BoolTest::eq) ? true_cnt : false_cnt; 800 801 profile->consume(); 802 return true; 803 } 804 return false; 805 } 806 //--------------------------dynamic_branch_prediction-------------------------- 807 // Try to gather dynamic branch prediction behavior. Return a probability 808 // of the branch being taken and set the "cnt" field. Returns a -1.0 809 // if we need to use static prediction for some reason. 810 float Parse::dynamic_branch_prediction(float &cnt, BoolTest::mask btest, Node* test) { 811 ResourceMark rm; 812 813 cnt = COUNT_UNKNOWN; 814 815 int taken = 0; 816 int not_taken = 0; 817 818 bool use_mdo = !has_injected_profile(btest, test, taken, not_taken); 819 820 if (use_mdo) { 821 // Use MethodData information if it is available 822 // FIXME: free the ProfileData structure 823 ciMethodData* methodData = method()->method_data(); 824 if (!methodData->is_mature()) return PROB_UNKNOWN; 825 ciProfileData* data = methodData->bci_to_data(bci()); 826 if (!data->is_JumpData()) return PROB_UNKNOWN; 827 828 // get taken and not taken values 829 taken = data->as_JumpData()->taken(); 830 not_taken = 0; 831 if (data->is_BranchData()) { 832 not_taken = data->as_BranchData()->not_taken(); 833 } 834 835 // scale the counts to be commensurate with invocation counts: 836 taken = method()->scale_count(taken); 837 not_taken = method()->scale_count(not_taken); 838 } 839 840 // Give up if too few (or too many, in which case the sum will overflow) counts to be meaningful. 841 // We also check that individual counters are positive first, otherwise the sum can become positive. 842 if (taken < 0 || not_taken < 0 || taken + not_taken < 40) { 843 if (C->log() != NULL) { 844 C->log()->elem("branch target_bci='%d' taken='%d' not_taken='%d'", iter().get_dest(), taken, not_taken); 845 } 846 return PROB_UNKNOWN; 847 } 848 849 // Compute frequency that we arrive here 850 float sum = taken + not_taken; 851 // Adjust, if this block is a cloned private block but the 852 // Jump counts are shared. Taken the private counts for 853 // just this path instead of the shared counts. 854 if( block()->count() > 0 ) 855 sum = block()->count(); 856 cnt = sum / FreqCountInvocations; 857 858 // Pin probability to sane limits 859 float prob; 860 if( !taken ) 861 prob = (0+PROB_MIN) / 2; 862 else if( !not_taken ) 863 prob = (1+PROB_MAX) / 2; 864 else { // Compute probability of true path 865 prob = (float)taken / (float)(taken + not_taken); 866 if (prob > PROB_MAX) prob = PROB_MAX; 867 if (prob < PROB_MIN) prob = PROB_MIN; 868 } 869 870 assert((cnt > 0.0f) && (prob > 0.0f), 871 "Bad frequency assignment in if"); 872 873 if (C->log() != NULL) { 874 const char* prob_str = NULL; 875 if (prob >= PROB_MAX) prob_str = (prob == PROB_MAX) ? "max" : "always"; 876 if (prob <= PROB_MIN) prob_str = (prob == PROB_MIN) ? "min" : "never"; 877 char prob_str_buf[30]; 878 if (prob_str == NULL) { 879 sprintf(prob_str_buf, "%g", prob); 880 prob_str = prob_str_buf; 881 } 882 C->log()->elem("branch target_bci='%d' taken='%d' not_taken='%d' cnt='%g' prob='%s'", 883 iter().get_dest(), taken, not_taken, cnt, prob_str); 884 } 885 return prob; 886 } 887 888 //-----------------------------branch_prediction------------------------------- 889 float Parse::branch_prediction(float& cnt, 890 BoolTest::mask btest, 891 int target_bci, 892 Node* test) { 893 float prob = dynamic_branch_prediction(cnt, btest, test); 894 // If prob is unknown, switch to static prediction 895 if (prob != PROB_UNKNOWN) return prob; 896 897 prob = PROB_FAIR; // Set default value 898 if (btest == BoolTest::eq) // Exactly equal test? 899 prob = PROB_STATIC_INFREQUENT; // Assume its relatively infrequent 900 else if (btest == BoolTest::ne) 901 prob = PROB_STATIC_FREQUENT; // Assume its relatively frequent 902 903 // If this is a conditional test guarding a backwards branch, 904 // assume its a loop-back edge. Make it a likely taken branch. 905 if (target_bci < bci()) { 906 if (is_osr_parse()) { // Could be a hot OSR'd loop; force deopt 907 // Since it's an OSR, we probably have profile data, but since 908 // branch_prediction returned PROB_UNKNOWN, the counts are too small. 909 // Let's make a special check here for completely zero counts. 910 ciMethodData* methodData = method()->method_data(); 911 if (!methodData->is_empty()) { 912 ciProfileData* data = methodData->bci_to_data(bci()); 913 // Only stop for truly zero counts, which mean an unknown part 914 // of the OSR-ed method, and we want to deopt to gather more stats. 915 // If you have ANY counts, then this loop is simply 'cold' relative 916 // to the OSR loop. 917 if (data->as_BranchData()->taken() + 918 data->as_BranchData()->not_taken() == 0 ) { 919 // This is the only way to return PROB_UNKNOWN: 920 return PROB_UNKNOWN; 921 } 922 } 923 } 924 prob = PROB_STATIC_FREQUENT; // Likely to take backwards branch 925 } 926 927 assert(prob != PROB_UNKNOWN, "must have some guess at this point"); 928 return prob; 929 } 930 931 // The magic constants are chosen so as to match the output of 932 // branch_prediction() when the profile reports a zero taken count. 933 // It is important to distinguish zero counts unambiguously, because 934 // some branches (e.g., _213_javac.Assembler.eliminate) validly produce 935 // very small but nonzero probabilities, which if confused with zero 936 // counts would keep the program recompiling indefinitely. 937 bool Parse::seems_never_taken(float prob) const { 938 return prob < PROB_MIN; 939 } 940 941 // True if the comparison seems to be the kind that will not change its 942 // statistics from true to false. See comments in adjust_map_after_if. 943 // This question is only asked along paths which are already 944 // classifed as untaken (by seems_never_taken), so really, 945 // if a path is never taken, its controlling comparison is 946 // already acting in a stable fashion. If the comparison 947 // seems stable, we will put an expensive uncommon trap 948 // on the untaken path. 949 bool Parse::seems_stable_comparison() const { 950 if (C->too_many_traps(method(), bci(), Deoptimization::Reason_unstable_if)) { 951 return false; 952 } 953 return true; 954 } 955 956 //-------------------------------repush_if_args-------------------------------- 957 // Push arguments of an "if" bytecode back onto the stack by adjusting _sp. 958 inline int Parse::repush_if_args() { 959 #ifndef PRODUCT 960 if (PrintOpto && WizardMode) { 961 tty->print("defending against excessive implicit null exceptions on %s @%d in ", 962 Bytecodes::name(iter().cur_bc()), iter().cur_bci()); 963 method()->print_name(); tty->cr(); 964 } 965 #endif 966 int bc_depth = - Bytecodes::depth(iter().cur_bc()); 967 assert(bc_depth == 1 || bc_depth == 2, "only two kinds of branches"); 968 DEBUG_ONLY(sync_jvms()); // argument(n) requires a synced jvms 969 assert(argument(0) != NULL, "must exist"); 970 assert(bc_depth == 1 || argument(1) != NULL, "two must exist"); 971 inc_sp(bc_depth); 972 return bc_depth; 973 } 974 975 //----------------------------------do_ifnull---------------------------------- 976 void Parse::do_ifnull(BoolTest::mask btest, Node *c) { 977 int target_bci = iter().get_dest(); 978 979 Block* branch_block = successor_for_bci(target_bci); 980 Block* next_block = successor_for_bci(iter().next_bci()); 981 982 float cnt; 983 float prob = branch_prediction(cnt, btest, target_bci, c); 984 if (prob == PROB_UNKNOWN) { 985 // (An earlier version of do_ifnull omitted this trap for OSR methods.) 986 #ifndef PRODUCT 987 if (PrintOpto && Verbose) 988 tty->print_cr("Never-taken edge stops compilation at bci %d",bci()); 989 #endif 990 repush_if_args(); // to gather stats on loop 991 // We need to mark this branch as taken so that if we recompile we will 992 // see that it is possible. In the tiered system the interpreter doesn't 993 // do profiling and by the time we get to the lower tier from the interpreter 994 // the path may be cold again. Make sure it doesn't look untaken 995 profile_taken_branch(target_bci, !ProfileInterpreter); 996 uncommon_trap(Deoptimization::Reason_unreached, 997 Deoptimization::Action_reinterpret, 998 NULL, "cold"); 999 if (C->eliminate_boxing()) { 1000 // Mark the successor blocks as parsed 1001 branch_block->next_path_num(); 1002 next_block->next_path_num(); 1003 } 1004 return; 1005 } 1006 1007 explicit_null_checks_inserted++; 1008 1009 // Generate real control flow 1010 Node *tst = _gvn.transform( new BoolNode( c, btest ) ); 1011 1012 // Sanity check the probability value 1013 assert(prob > 0.0f,"Bad probability in Parser"); 1014 // Need xform to put node in hash table 1015 IfNode *iff = create_and_xform_if( control(), tst, prob, cnt ); 1016 assert(iff->_prob > 0.0f,"Optimizer made bad probability in parser"); 1017 // True branch 1018 { PreserveJVMState pjvms(this); 1019 Node* iftrue = _gvn.transform( new IfTrueNode (iff) ); 1020 set_control(iftrue); 1021 1022 if (stopped()) { // Path is dead? 1023 explicit_null_checks_elided++; 1024 if (C->eliminate_boxing()) { 1025 // Mark the successor block as parsed 1026 branch_block->next_path_num(); 1027 } 1028 } else { // Path is live. 1029 // Update method data 1030 profile_taken_branch(target_bci); 1031 adjust_map_after_if(btest, c, prob, branch_block, next_block); 1032 if (!stopped()) { 1033 merge(target_bci); 1034 } 1035 } 1036 } 1037 1038 // False branch 1039 Node* iffalse = _gvn.transform( new IfFalseNode(iff) ); 1040 set_control(iffalse); 1041 1042 if (stopped()) { // Path is dead? 1043 explicit_null_checks_elided++; 1044 if (C->eliminate_boxing()) { 1045 // Mark the successor block as parsed 1046 next_block->next_path_num(); 1047 } 1048 } else { // Path is live. 1049 // Update method data 1050 profile_not_taken_branch(); 1051 adjust_map_after_if(BoolTest(btest).negate(), c, 1.0-prob, 1052 next_block, branch_block); 1053 } 1054 } 1055 1056 //------------------------------------do_if------------------------------------ 1057 void Parse::do_if(BoolTest::mask btest, Node* c) { 1058 int target_bci = iter().get_dest(); 1059 1060 Block* branch_block = successor_for_bci(target_bci); 1061 Block* next_block = successor_for_bci(iter().next_bci()); 1062 1063 float cnt; 1064 float prob = branch_prediction(cnt, btest, target_bci, c); 1065 float untaken_prob = 1.0 - prob; 1066 1067 if (prob == PROB_UNKNOWN) { 1068 #ifndef PRODUCT 1069 if (PrintOpto && Verbose) 1070 tty->print_cr("Never-taken edge stops compilation at bci %d",bci()); 1071 #endif 1072 repush_if_args(); // to gather stats on loop 1073 // We need to mark this branch as taken so that if we recompile we will 1074 // see that it is possible. In the tiered system the interpreter doesn't 1075 // do profiling and by the time we get to the lower tier from the interpreter 1076 // the path may be cold again. Make sure it doesn't look untaken 1077 profile_taken_branch(target_bci, !ProfileInterpreter); 1078 uncommon_trap(Deoptimization::Reason_unreached, 1079 Deoptimization::Action_reinterpret, 1080 NULL, "cold"); 1081 if (C->eliminate_boxing()) { 1082 // Mark the successor blocks as parsed 1083 branch_block->next_path_num(); 1084 next_block->next_path_num(); 1085 } 1086 return; 1087 } 1088 1089 // Sanity check the probability value 1090 assert(0.0f < prob && prob < 1.0f,"Bad probability in Parser"); 1091 1092 bool taken_if_true = true; 1093 // Convert BoolTest to canonical form: 1094 if (!BoolTest(btest).is_canonical()) { 1095 btest = BoolTest(btest).negate(); 1096 taken_if_true = false; 1097 // prob is NOT updated here; it remains the probability of the taken 1098 // path (as opposed to the prob of the path guarded by an 'IfTrueNode'). 1099 } 1100 assert(btest != BoolTest::eq, "!= is the only canonical exact test"); 1101 1102 Node* tst0 = new BoolNode(c, btest); 1103 Node* tst = _gvn.transform(tst0); 1104 BoolTest::mask taken_btest = BoolTest::illegal; 1105 BoolTest::mask untaken_btest = BoolTest::illegal; 1106 1107 if (tst->is_Bool()) { 1108 // Refresh c from the transformed bool node, since it may be 1109 // simpler than the original c. Also re-canonicalize btest. 1110 // This wins when (Bool ne (Conv2B p) 0) => (Bool ne (CmpP p NULL)). 1111 // That can arise from statements like: if (x instanceof C) ... 1112 if (tst != tst0) { 1113 // Canonicalize one more time since transform can change it. 1114 btest = tst->as_Bool()->_test._test; 1115 if (!BoolTest(btest).is_canonical()) { 1116 // Reverse edges one more time... 1117 tst = _gvn.transform( tst->as_Bool()->negate(&_gvn) ); 1118 btest = tst->as_Bool()->_test._test; 1119 assert(BoolTest(btest).is_canonical(), "sanity"); 1120 taken_if_true = !taken_if_true; 1121 } 1122 c = tst->in(1); 1123 } 1124 BoolTest::mask neg_btest = BoolTest(btest).negate(); 1125 taken_btest = taken_if_true ? btest : neg_btest; 1126 untaken_btest = taken_if_true ? neg_btest : btest; 1127 } 1128 1129 // Generate real control flow 1130 float true_prob = (taken_if_true ? prob : untaken_prob); 1131 IfNode* iff = create_and_map_if(control(), tst, true_prob, cnt); 1132 assert(iff->_prob > 0.0f,"Optimizer made bad probability in parser"); 1133 Node* taken_branch = new IfTrueNode(iff); 1134 Node* untaken_branch = new IfFalseNode(iff); 1135 if (!taken_if_true) { // Finish conversion to canonical form 1136 Node* tmp = taken_branch; 1137 taken_branch = untaken_branch; 1138 untaken_branch = tmp; 1139 } 1140 1141 // Branch is taken: 1142 { PreserveJVMState pjvms(this); 1143 taken_branch = _gvn.transform(taken_branch); 1144 set_control(taken_branch); 1145 1146 if (stopped()) { 1147 if (C->eliminate_boxing()) { 1148 // Mark the successor block as parsed 1149 branch_block->next_path_num(); 1150 } 1151 } else { 1152 // Update method data 1153 profile_taken_branch(target_bci); 1154 adjust_map_after_if(taken_btest, c, prob, branch_block, next_block); 1155 if (!stopped()) { 1156 merge(target_bci); 1157 } 1158 } 1159 } 1160 1161 untaken_branch = _gvn.transform(untaken_branch); 1162 set_control(untaken_branch); 1163 1164 // Branch not taken. 1165 if (stopped()) { 1166 if (C->eliminate_boxing()) { 1167 // Mark the successor block as parsed 1168 next_block->next_path_num(); 1169 } 1170 } else { 1171 // Update method data 1172 profile_not_taken_branch(); 1173 adjust_map_after_if(untaken_btest, c, untaken_prob, 1174 next_block, branch_block); 1175 } 1176 } 1177 1178 bool Parse::path_is_suitable_for_uncommon_trap(float prob) const { 1179 // Don't want to speculate on uncommon traps when running with -Xcomp 1180 if (!UseInterpreter) { 1181 return false; 1182 } 1183 return (seems_never_taken(prob) && seems_stable_comparison()); 1184 } 1185 1186 //----------------------------adjust_map_after_if------------------------------ 1187 // Adjust the JVM state to reflect the result of taking this path. 1188 // Basically, it means inspecting the CmpNode controlling this 1189 // branch, seeing how it constrains a tested value, and then 1190 // deciding if it's worth our while to encode this constraint 1191 // as graph nodes in the current abstract interpretation map. 1192 void Parse::adjust_map_after_if(BoolTest::mask btest, Node* c, float prob, 1193 Block* path, Block* other_path) { 1194 if (stopped() || !c->is_Cmp() || btest == BoolTest::illegal) 1195 return; // nothing to do 1196 1197 bool is_fallthrough = (path == successor_for_bci(iter().next_bci())); 1198 1199 if (path_is_suitable_for_uncommon_trap(prob)) { 1200 repush_if_args(); 1201 uncommon_trap(Deoptimization::Reason_unstable_if, 1202 Deoptimization::Action_reinterpret, 1203 NULL, 1204 (is_fallthrough ? "taken always" : "taken never")); 1205 return; 1206 } 1207 1208 Node* val = c->in(1); 1209 Node* con = c->in(2); 1210 const Type* tcon = _gvn.type(con); 1211 const Type* tval = _gvn.type(val); 1212 bool have_con = tcon->singleton(); 1213 if (tval->singleton()) { 1214 if (!have_con) { 1215 // Swap, so constant is in con. 1216 con = val; 1217 tcon = tval; 1218 val = c->in(2); 1219 tval = _gvn.type(val); 1220 btest = BoolTest(btest).commute(); 1221 have_con = true; 1222 } else { 1223 // Do we have two constants? Then leave well enough alone. 1224 have_con = false; 1225 } 1226 } 1227 if (!have_con) // remaining adjustments need a con 1228 return; 1229 1230 sharpen_type_after_if(btest, con, tcon, val, tval); 1231 } 1232 1233 1234 static Node* extract_obj_from_klass_load(PhaseGVN* gvn, Node* n) { 1235 Node* ldk; 1236 if (n->is_DecodeNKlass()) { 1237 if (n->in(1)->Opcode() != Op_LoadNKlass) { 1238 return NULL; 1239 } else { 1240 ldk = n->in(1); 1241 } 1242 } else if (n->Opcode() != Op_LoadKlass) { 1243 return NULL; 1244 } else { 1245 ldk = n; 1246 } 1247 assert(ldk != NULL && ldk->is_Load(), "should have found a LoadKlass or LoadNKlass node"); 1248 1249 Node* adr = ldk->in(MemNode::Address); 1250 intptr_t off = 0; 1251 Node* obj = AddPNode::Ideal_base_and_offset(adr, gvn, off); 1252 if (obj == NULL || off != oopDesc::klass_offset_in_bytes()) // loading oopDesc::_klass? 1253 return NULL; 1254 const TypePtr* tp = gvn->type(obj)->is_ptr(); 1255 if (tp == NULL || !(tp->isa_instptr() || tp->isa_aryptr())) // is obj a Java object ptr? 1256 return NULL; 1257 1258 return obj; 1259 } 1260 1261 void Parse::sharpen_type_after_if(BoolTest::mask btest, 1262 Node* con, const Type* tcon, 1263 Node* val, const Type* tval) { 1264 // Look for opportunities to sharpen the type of a node 1265 // whose klass is compared with a constant klass. 1266 if (btest == BoolTest::eq && tcon->isa_klassptr()) { 1267 Node* obj = extract_obj_from_klass_load(&_gvn, val); 1268 const TypeOopPtr* con_type = tcon->isa_klassptr()->as_instance_type(); 1269 if (obj != NULL && (con_type->isa_instptr() || con_type->isa_aryptr())) { 1270 // Found: 1271 // Bool(CmpP(LoadKlass(obj._klass), ConP(Foo.klass)), [eq]) 1272 // or the narrowOop equivalent. 1273 const Type* obj_type = _gvn.type(obj); 1274 const TypeOopPtr* tboth = obj_type->join_speculative(con_type)->isa_oopptr(); 1275 if (tboth != NULL && tboth->klass_is_exact() && tboth != obj_type && 1276 tboth->higher_equal(obj_type)) { 1277 // obj has to be of the exact type Foo if the CmpP succeeds. 1278 int obj_in_map = map()->find_edge(obj); 1279 JVMState* jvms = this->jvms(); 1280 if (obj_in_map >= 0 && 1281 (jvms->is_loc(obj_in_map) || jvms->is_stk(obj_in_map))) { 1282 TypeNode* ccast = new CheckCastPPNode(control(), obj, tboth); 1283 const Type* tcc = ccast->as_Type()->type(); 1284 assert(tcc != obj_type && tcc->higher_equal(obj_type), "must improve"); 1285 // Delay transform() call to allow recovery of pre-cast value 1286 // at the control merge. 1287 _gvn.set_type_bottom(ccast); 1288 record_for_igvn(ccast); 1289 // Here's the payoff. 1290 replace_in_map(obj, ccast); 1291 } 1292 } 1293 } 1294 } 1295 1296 int val_in_map = map()->find_edge(val); 1297 if (val_in_map < 0) return; // replace_in_map would be useless 1298 { 1299 JVMState* jvms = this->jvms(); 1300 if (!(jvms->is_loc(val_in_map) || 1301 jvms->is_stk(val_in_map))) 1302 return; // again, it would be useless 1303 } 1304 1305 // Check for a comparison to a constant, and "know" that the compared 1306 // value is constrained on this path. 1307 assert(tcon->singleton(), ""); 1308 ConstraintCastNode* ccast = NULL; 1309 Node* cast = NULL; 1310 1311 switch (btest) { 1312 case BoolTest::eq: // Constant test? 1313 { 1314 const Type* tboth = tcon->join_speculative(tval); 1315 if (tboth == tval) break; // Nothing to gain. 1316 if (tcon->isa_int()) { 1317 ccast = new CastIINode(val, tboth); 1318 } else if (tcon == TypePtr::NULL_PTR) { 1319 // Cast to null, but keep the pointer identity temporarily live. 1320 ccast = new CastPPNode(val, tboth); 1321 } else { 1322 const TypeF* tf = tcon->isa_float_constant(); 1323 const TypeD* td = tcon->isa_double_constant(); 1324 // Exclude tests vs float/double 0 as these could be 1325 // either +0 or -0. Just because you are equal to +0 1326 // doesn't mean you ARE +0! 1327 // Note, following code also replaces Long and Oop values. 1328 if ((!tf || tf->_f != 0.0) && 1329 (!td || td->_d != 0.0)) 1330 cast = con; // Replace non-constant val by con. 1331 } 1332 } 1333 break; 1334 1335 case BoolTest::ne: 1336 if (tcon == TypePtr::NULL_PTR) { 1337 cast = cast_not_null(val, false); 1338 } 1339 break; 1340 1341 default: 1342 // (At this point we could record int range types with CastII.) 1343 break; 1344 } 1345 1346 if (ccast != NULL) { 1347 const Type* tcc = ccast->as_Type()->type(); 1348 assert(tcc != tval && tcc->higher_equal(tval), "must improve"); 1349 // Delay transform() call to allow recovery of pre-cast value 1350 // at the control merge. 1351 ccast->set_req(0, control()); 1352 _gvn.set_type_bottom(ccast); 1353 record_for_igvn(ccast); 1354 cast = ccast; 1355 } 1356 1357 if (cast != NULL) { // Here's the payoff. 1358 replace_in_map(val, cast); 1359 } 1360 } 1361 1362 /** 1363 * Use speculative type to optimize CmpP node: if comparison is 1364 * against the low level class, cast the object to the speculative 1365 * type if any. CmpP should then go away. 1366 * 1367 * @param c expected CmpP node 1368 * @return result of CmpP on object casted to speculative type 1369 * 1370 */ 1371 Node* Parse::optimize_cmp_with_klass(Node* c) { 1372 // If this is transformed by the _gvn to a comparison with the low 1373 // level klass then we may be able to use speculation 1374 if (c->Opcode() == Op_CmpP && 1375 (c->in(1)->Opcode() == Op_LoadKlass || c->in(1)->Opcode() == Op_DecodeNKlass) && 1376 c->in(2)->is_Con()) { 1377 Node* load_klass = NULL; 1378 Node* decode = NULL; 1379 if (c->in(1)->Opcode() == Op_DecodeNKlass) { 1380 decode = c->in(1); 1381 load_klass = c->in(1)->in(1); 1382 } else { 1383 load_klass = c->in(1); 1384 } 1385 if (load_klass->in(2)->is_AddP()) { 1386 Node* addp = load_klass->in(2); 1387 Node* obj = addp->in(AddPNode::Address); 1388 const TypeOopPtr* obj_type = _gvn.type(obj)->is_oopptr(); 1389 if (obj_type->speculative_type_not_null() != NULL) { 1390 ciKlass* k = obj_type->speculative_type(); 1391 inc_sp(2); 1392 obj = maybe_cast_profiled_obj(obj, k); 1393 dec_sp(2); 1394 // Make the CmpP use the casted obj 1395 addp = basic_plus_adr(obj, addp->in(AddPNode::Offset)); 1396 load_klass = load_klass->clone(); 1397 load_klass->set_req(2, addp); 1398 load_klass = _gvn.transform(load_klass); 1399 if (decode != NULL) { 1400 decode = decode->clone(); 1401 decode->set_req(1, load_klass); 1402 load_klass = _gvn.transform(decode); 1403 } 1404 c = c->clone(); 1405 c->set_req(1, load_klass); 1406 c = _gvn.transform(c); 1407 } 1408 } 1409 } 1410 return c; 1411 } 1412 1413 //------------------------------do_one_bytecode-------------------------------- 1414 // Parse this bytecode, and alter the Parsers JVM->Node mapping 1415 void Parse::do_one_bytecode() { 1416 Node *a, *b, *c, *d; // Handy temps 1417 BoolTest::mask btest; 1418 int i; 1419 1420 assert(!has_exceptions(), "bytecode entry state must be clear of throws"); 1421 1422 if (C->check_node_count(NodeLimitFudgeFactor * 5, 1423 "out of nodes parsing method")) { 1424 return; 1425 } 1426 1427 #ifdef ASSERT 1428 // for setting breakpoints 1429 if (TraceOptoParse) { 1430 tty->print(" @"); 1431 dump_bci(bci()); 1432 tty->cr(); 1433 } 1434 #endif 1435 1436 switch (bc()) { 1437 case Bytecodes::_nop: 1438 // do nothing 1439 break; 1440 case Bytecodes::_lconst_0: 1441 push_pair(longcon(0)); 1442 break; 1443 1444 case Bytecodes::_lconst_1: 1445 push_pair(longcon(1)); 1446 break; 1447 1448 case Bytecodes::_fconst_0: 1449 push(zerocon(T_FLOAT)); 1450 break; 1451 1452 case Bytecodes::_fconst_1: 1453 push(makecon(TypeF::ONE)); 1454 break; 1455 1456 case Bytecodes::_fconst_2: 1457 push(makecon(TypeF::make(2.0f))); 1458 break; 1459 1460 case Bytecodes::_dconst_0: 1461 push_pair(zerocon(T_DOUBLE)); 1462 break; 1463 1464 case Bytecodes::_dconst_1: 1465 push_pair(makecon(TypeD::ONE)); 1466 break; 1467 1468 case Bytecodes::_iconst_m1:push(intcon(-1)); break; 1469 case Bytecodes::_iconst_0: push(intcon( 0)); break; 1470 case Bytecodes::_iconst_1: push(intcon( 1)); break; 1471 case Bytecodes::_iconst_2: push(intcon( 2)); break; 1472 case Bytecodes::_iconst_3: push(intcon( 3)); break; 1473 case Bytecodes::_iconst_4: push(intcon( 4)); break; 1474 case Bytecodes::_iconst_5: push(intcon( 5)); break; 1475 case Bytecodes::_bipush: push(intcon(iter().get_constant_u1())); break; 1476 case Bytecodes::_sipush: push(intcon(iter().get_constant_u2())); break; 1477 case Bytecodes::_aconst_null: push(null()); break; 1478 case Bytecodes::_ldc: 1479 case Bytecodes::_ldc_w: 1480 case Bytecodes::_ldc2_w: 1481 // If the constant is unresolved, run this BC once in the interpreter. 1482 { 1483 ciConstant constant = iter().get_constant(); 1484 if (constant.basic_type() == T_OBJECT && 1485 !constant.as_object()->is_loaded()) { 1486 int index = iter().get_constant_pool_index(); 1487 constantTag tag = iter().get_constant_pool_tag(index); 1488 uncommon_trap(Deoptimization::make_trap_request 1489 (Deoptimization::Reason_unloaded, 1490 Deoptimization::Action_reinterpret, 1491 index), 1492 NULL, tag.internal_name()); 1493 break; 1494 } 1495 assert(constant.basic_type() != T_OBJECT || constant.as_object()->is_instance(), 1496 "must be java_mirror of klass"); 1497 bool pushed = push_constant(constant, true); 1498 guarantee(pushed, "must be possible to push this constant"); 1499 } 1500 1501 break; 1502 1503 case Bytecodes::_aload_0: 1504 push( local(0) ); 1505 break; 1506 case Bytecodes::_aload_1: 1507 push( local(1) ); 1508 break; 1509 case Bytecodes::_aload_2: 1510 push( local(2) ); 1511 break; 1512 case Bytecodes::_aload_3: 1513 push( local(3) ); 1514 break; 1515 case Bytecodes::_aload: 1516 push( local(iter().get_index()) ); 1517 break; 1518 1519 case Bytecodes::_fload_0: 1520 case Bytecodes::_iload_0: 1521 push( local(0) ); 1522 break; 1523 case Bytecodes::_fload_1: 1524 case Bytecodes::_iload_1: 1525 push( local(1) ); 1526 break; 1527 case Bytecodes::_fload_2: 1528 case Bytecodes::_iload_2: 1529 push( local(2) ); 1530 break; 1531 case Bytecodes::_fload_3: 1532 case Bytecodes::_iload_3: 1533 push( local(3) ); 1534 break; 1535 case Bytecodes::_fload: 1536 case Bytecodes::_iload: 1537 push( local(iter().get_index()) ); 1538 break; 1539 case Bytecodes::_lload_0: 1540 push_pair_local( 0 ); 1541 break; 1542 case Bytecodes::_lload_1: 1543 push_pair_local( 1 ); 1544 break; 1545 case Bytecodes::_lload_2: 1546 push_pair_local( 2 ); 1547 break; 1548 case Bytecodes::_lload_3: 1549 push_pair_local( 3 ); 1550 break; 1551 case Bytecodes::_lload: 1552 push_pair_local( iter().get_index() ); 1553 break; 1554 1555 case Bytecodes::_dload_0: 1556 push_pair_local(0); 1557 break; 1558 case Bytecodes::_dload_1: 1559 push_pair_local(1); 1560 break; 1561 case Bytecodes::_dload_2: 1562 push_pair_local(2); 1563 break; 1564 case Bytecodes::_dload_3: 1565 push_pair_local(3); 1566 break; 1567 case Bytecodes::_dload: 1568 push_pair_local(iter().get_index()); 1569 break; 1570 case Bytecodes::_fstore_0: 1571 case Bytecodes::_istore_0: 1572 case Bytecodes::_astore_0: 1573 set_local( 0, pop() ); 1574 break; 1575 case Bytecodes::_fstore_1: 1576 case Bytecodes::_istore_1: 1577 case Bytecodes::_astore_1: 1578 set_local( 1, pop() ); 1579 break; 1580 case Bytecodes::_fstore_2: 1581 case Bytecodes::_istore_2: 1582 case Bytecodes::_astore_2: 1583 set_local( 2, pop() ); 1584 break; 1585 case Bytecodes::_fstore_3: 1586 case Bytecodes::_istore_3: 1587 case Bytecodes::_astore_3: 1588 set_local( 3, pop() ); 1589 break; 1590 case Bytecodes::_fstore: 1591 case Bytecodes::_istore: 1592 case Bytecodes::_astore: 1593 set_local( iter().get_index(), pop() ); 1594 break; 1595 // long stores 1596 case Bytecodes::_lstore_0: 1597 set_pair_local( 0, pop_pair() ); 1598 break; 1599 case Bytecodes::_lstore_1: 1600 set_pair_local( 1, pop_pair() ); 1601 break; 1602 case Bytecodes::_lstore_2: 1603 set_pair_local( 2, pop_pair() ); 1604 break; 1605 case Bytecodes::_lstore_3: 1606 set_pair_local( 3, pop_pair() ); 1607 break; 1608 case Bytecodes::_lstore: 1609 set_pair_local( iter().get_index(), pop_pair() ); 1610 break; 1611 1612 // double stores 1613 case Bytecodes::_dstore_0: 1614 set_pair_local( 0, dstore_rounding(pop_pair()) ); 1615 break; 1616 case Bytecodes::_dstore_1: 1617 set_pair_local( 1, dstore_rounding(pop_pair()) ); 1618 break; 1619 case Bytecodes::_dstore_2: 1620 set_pair_local( 2, dstore_rounding(pop_pair()) ); 1621 break; 1622 case Bytecodes::_dstore_3: 1623 set_pair_local( 3, dstore_rounding(pop_pair()) ); 1624 break; 1625 case Bytecodes::_dstore: 1626 set_pair_local( iter().get_index(), dstore_rounding(pop_pair()) ); 1627 break; 1628 1629 case Bytecodes::_pop: dec_sp(1); break; 1630 case Bytecodes::_pop2: dec_sp(2); break; 1631 case Bytecodes::_swap: 1632 a = pop(); 1633 b = pop(); 1634 push(a); 1635 push(b); 1636 break; 1637 case Bytecodes::_dup: 1638 a = pop(); 1639 push(a); 1640 push(a); 1641 break; 1642 case Bytecodes::_dup_x1: 1643 a = pop(); 1644 b = pop(); 1645 push( a ); 1646 push( b ); 1647 push( a ); 1648 break; 1649 case Bytecodes::_dup_x2: 1650 a = pop(); 1651 b = pop(); 1652 c = pop(); 1653 push( a ); 1654 push( c ); 1655 push( b ); 1656 push( a ); 1657 break; 1658 case Bytecodes::_dup2: 1659 a = pop(); 1660 b = pop(); 1661 push( b ); 1662 push( a ); 1663 push( b ); 1664 push( a ); 1665 break; 1666 1667 case Bytecodes::_dup2_x1: 1668 // before: .. c, b, a 1669 // after: .. b, a, c, b, a 1670 // not tested 1671 a = pop(); 1672 b = pop(); 1673 c = pop(); 1674 push( b ); 1675 push( a ); 1676 push( c ); 1677 push( b ); 1678 push( a ); 1679 break; 1680 case Bytecodes::_dup2_x2: 1681 // before: .. d, c, b, a 1682 // after: .. b, a, d, c, b, a 1683 // not tested 1684 a = pop(); 1685 b = pop(); 1686 c = pop(); 1687 d = pop(); 1688 push( b ); 1689 push( a ); 1690 push( d ); 1691 push( c ); 1692 push( b ); 1693 push( a ); 1694 break; 1695 1696 case Bytecodes::_arraylength: { 1697 // Must do null-check with value on expression stack 1698 Node *ary = null_check(peek(), T_ARRAY); 1699 // Compile-time detect of null-exception? 1700 if (stopped()) return; 1701 a = pop(); 1702 push(load_array_length(a)); 1703 break; 1704 } 1705 1706 case Bytecodes::_baload: array_load(T_BYTE); break; 1707 case Bytecodes::_caload: array_load(T_CHAR); break; 1708 case Bytecodes::_iaload: array_load(T_INT); break; 1709 case Bytecodes::_saload: array_load(T_SHORT); break; 1710 case Bytecodes::_faload: array_load(T_FLOAT); break; 1711 case Bytecodes::_aaload: array_load(T_OBJECT); break; 1712 case Bytecodes::_laload: { 1713 a = array_addressing(T_LONG, 0); 1714 if (stopped()) return; // guaranteed null or range check 1715 dec_sp(2); // Pop array and index 1716 push_pair(make_load(control(), a, TypeLong::LONG, T_LONG, TypeAryPtr::LONGS, MemNode::unordered)); 1717 break; 1718 } 1719 case Bytecodes::_daload: { 1720 a = array_addressing(T_DOUBLE, 0); 1721 if (stopped()) return; // guaranteed null or range check 1722 dec_sp(2); // Pop array and index 1723 push_pair(make_load(control(), a, Type::DOUBLE, T_DOUBLE, TypeAryPtr::DOUBLES, MemNode::unordered)); 1724 break; 1725 } 1726 case Bytecodes::_bastore: array_store(T_BYTE); break; 1727 case Bytecodes::_castore: array_store(T_CHAR); break; 1728 case Bytecodes::_iastore: array_store(T_INT); break; 1729 case Bytecodes::_sastore: array_store(T_SHORT); break; 1730 case Bytecodes::_fastore: array_store(T_FLOAT); break; 1731 case Bytecodes::_aastore: { 1732 d = array_addressing(T_OBJECT, 1); 1733 if (stopped()) return; // guaranteed null or range check 1734 array_store_check(); 1735 c = pop(); // Oop to store 1736 b = pop(); // index (already used) 1737 a = pop(); // the array itself 1738 const TypeOopPtr* elemtype = _gvn.type(a)->is_aryptr()->elem()->make_oopptr(); 1739 const TypeAryPtr* adr_type = TypeAryPtr::OOPS; 1740 Node* store = store_oop_to_array(control(), a, d, adr_type, c, elemtype, T_OBJECT, MemNode::release); 1741 break; 1742 } 1743 case Bytecodes::_lastore: { 1744 a = array_addressing(T_LONG, 2); 1745 if (stopped()) return; // guaranteed null or range check 1746 c = pop_pair(); 1747 dec_sp(2); // Pop array and index 1748 store_to_memory(control(), a, c, T_LONG, TypeAryPtr::LONGS, MemNode::unordered); 1749 break; 1750 } 1751 case Bytecodes::_dastore: { 1752 a = array_addressing(T_DOUBLE, 2); 1753 if (stopped()) return; // guaranteed null or range check 1754 c = pop_pair(); 1755 dec_sp(2); // Pop array and index 1756 c = dstore_rounding(c); 1757 store_to_memory(control(), a, c, T_DOUBLE, TypeAryPtr::DOUBLES, MemNode::unordered); 1758 break; 1759 } 1760 case Bytecodes::_getfield: 1761 do_getfield(); 1762 break; 1763 1764 case Bytecodes::_getstatic: 1765 do_getstatic(); 1766 break; 1767 1768 case Bytecodes::_putfield: 1769 do_putfield(); 1770 break; 1771 1772 case Bytecodes::_putstatic: 1773 do_putstatic(); 1774 break; 1775 1776 case Bytecodes::_irem: 1777 do_irem(); 1778 break; 1779 case Bytecodes::_idiv: 1780 // Must keep both values on the expression-stack during null-check 1781 zero_check_int(peek()); 1782 // Compile-time detect of null-exception? 1783 if (stopped()) return; 1784 b = pop(); 1785 a = pop(); 1786 push( _gvn.transform( new DivINode(control(),a,b) ) ); 1787 break; 1788 case Bytecodes::_imul: 1789 b = pop(); a = pop(); 1790 push( _gvn.transform( new MulINode(a,b) ) ); 1791 break; 1792 case Bytecodes::_iadd: 1793 b = pop(); a = pop(); 1794 push( _gvn.transform( new AddINode(a,b) ) ); 1795 break; 1796 case Bytecodes::_ineg: 1797 a = pop(); 1798 push( _gvn.transform( new SubINode(_gvn.intcon(0),a)) ); 1799 break; 1800 case Bytecodes::_isub: 1801 b = pop(); a = pop(); 1802 push( _gvn.transform( new SubINode(a,b) ) ); 1803 break; 1804 case Bytecodes::_iand: 1805 b = pop(); a = pop(); 1806 push( _gvn.transform( new AndINode(a,b) ) ); 1807 break; 1808 case Bytecodes::_ior: 1809 b = pop(); a = pop(); 1810 push( _gvn.transform( new OrINode(a,b) ) ); 1811 break; 1812 case Bytecodes::_ixor: 1813 b = pop(); a = pop(); 1814 push( _gvn.transform( new XorINode(a,b) ) ); 1815 break; 1816 case Bytecodes::_ishl: 1817 b = pop(); a = pop(); 1818 push( _gvn.transform( new LShiftINode(a,b) ) ); 1819 break; 1820 case Bytecodes::_ishr: 1821 b = pop(); a = pop(); 1822 push( _gvn.transform( new RShiftINode(a,b) ) ); 1823 break; 1824 case Bytecodes::_iushr: 1825 b = pop(); a = pop(); 1826 push( _gvn.transform( new URShiftINode(a,b) ) ); 1827 break; 1828 1829 case Bytecodes::_fneg: 1830 a = pop(); 1831 b = _gvn.transform(new NegFNode (a)); 1832 push(b); 1833 break; 1834 1835 case Bytecodes::_fsub: 1836 b = pop(); 1837 a = pop(); 1838 c = _gvn.transform( new SubFNode(a,b) ); 1839 d = precision_rounding(c); 1840 push( d ); 1841 break; 1842 1843 case Bytecodes::_fadd: 1844 b = pop(); 1845 a = pop(); 1846 c = _gvn.transform( new AddFNode(a,b) ); 1847 d = precision_rounding(c); 1848 push( d ); 1849 break; 1850 1851 case Bytecodes::_fmul: 1852 b = pop(); 1853 a = pop(); 1854 c = _gvn.transform( new MulFNode(a,b) ); 1855 d = precision_rounding(c); 1856 push( d ); 1857 break; 1858 1859 case Bytecodes::_fdiv: 1860 b = pop(); 1861 a = pop(); 1862 c = _gvn.transform( new DivFNode(0,a,b) ); 1863 d = precision_rounding(c); 1864 push( d ); 1865 break; 1866 1867 case Bytecodes::_frem: 1868 if (Matcher::has_match_rule(Op_ModF)) { 1869 // Generate a ModF node. 1870 b = pop(); 1871 a = pop(); 1872 c = _gvn.transform( new ModFNode(0,a,b) ); 1873 d = precision_rounding(c); 1874 push( d ); 1875 } 1876 else { 1877 // Generate a call. 1878 modf(); 1879 } 1880 break; 1881 1882 case Bytecodes::_fcmpl: 1883 b = pop(); 1884 a = pop(); 1885 c = _gvn.transform( new CmpF3Node( a, b)); 1886 push(c); 1887 break; 1888 case Bytecodes::_fcmpg: 1889 b = pop(); 1890 a = pop(); 1891 1892 // Same as fcmpl but need to flip the unordered case. Swap the inputs, 1893 // which negates the result sign except for unordered. Flip the unordered 1894 // as well by using CmpF3 which implements unordered-lesser instead of 1895 // unordered-greater semantics. Finally, commute the result bits. Result 1896 // is same as using a CmpF3Greater except we did it with CmpF3 alone. 1897 c = _gvn.transform( new CmpF3Node( b, a)); 1898 c = _gvn.transform( new SubINode(_gvn.intcon(0),c) ); 1899 push(c); 1900 break; 1901 1902 case Bytecodes::_f2i: 1903 a = pop(); 1904 push(_gvn.transform(new ConvF2INode(a))); 1905 break; 1906 1907 case Bytecodes::_d2i: 1908 a = pop_pair(); 1909 b = _gvn.transform(new ConvD2INode(a)); 1910 push( b ); 1911 break; 1912 1913 case Bytecodes::_f2d: 1914 a = pop(); 1915 b = _gvn.transform( new ConvF2DNode(a)); 1916 push_pair( b ); 1917 break; 1918 1919 case Bytecodes::_d2f: 1920 a = pop_pair(); 1921 b = _gvn.transform( new ConvD2FNode(a)); 1922 // This breaks _227_mtrt (speed & correctness) and _222_mpegaudio (speed) 1923 //b = _gvn.transform(new RoundFloatNode(0, b) ); 1924 push( b ); 1925 break; 1926 1927 case Bytecodes::_l2f: 1928 if (Matcher::convL2FSupported()) { 1929 a = pop_pair(); 1930 b = _gvn.transform( new ConvL2FNode(a)); 1931 // For i486.ad, FILD doesn't restrict precision to 24 or 53 bits. 1932 // Rather than storing the result into an FP register then pushing 1933 // out to memory to round, the machine instruction that implements 1934 // ConvL2D is responsible for rounding. 1935 // c = precision_rounding(b); 1936 c = _gvn.transform(b); 1937 push(c); 1938 } else { 1939 l2f(); 1940 } 1941 break; 1942 1943 case Bytecodes::_l2d: 1944 a = pop_pair(); 1945 b = _gvn.transform( new ConvL2DNode(a)); 1946 // For i486.ad, rounding is always necessary (see _l2f above). 1947 // c = dprecision_rounding(b); 1948 c = _gvn.transform(b); 1949 push_pair(c); 1950 break; 1951 1952 case Bytecodes::_f2l: 1953 a = pop(); 1954 b = _gvn.transform( new ConvF2LNode(a)); 1955 push_pair(b); 1956 break; 1957 1958 case Bytecodes::_d2l: 1959 a = pop_pair(); 1960 b = _gvn.transform( new ConvD2LNode(a)); 1961 push_pair(b); 1962 break; 1963 1964 case Bytecodes::_dsub: 1965 b = pop_pair(); 1966 a = pop_pair(); 1967 c = _gvn.transform( new SubDNode(a,b) ); 1968 d = dprecision_rounding(c); 1969 push_pair( d ); 1970 break; 1971 1972 case Bytecodes::_dadd: 1973 b = pop_pair(); 1974 a = pop_pair(); 1975 c = _gvn.transform( new AddDNode(a,b) ); 1976 d = dprecision_rounding(c); 1977 push_pair( d ); 1978 break; 1979 1980 case Bytecodes::_dmul: 1981 b = pop_pair(); 1982 a = pop_pair(); 1983 c = _gvn.transform( new MulDNode(a,b) ); 1984 d = dprecision_rounding(c); 1985 push_pair( d ); 1986 break; 1987 1988 case Bytecodes::_ddiv: 1989 b = pop_pair(); 1990 a = pop_pair(); 1991 c = _gvn.transform( new DivDNode(0,a,b) ); 1992 d = dprecision_rounding(c); 1993 push_pair( d ); 1994 break; 1995 1996 case Bytecodes::_dneg: 1997 a = pop_pair(); 1998 b = _gvn.transform(new NegDNode (a)); 1999 push_pair(b); 2000 break; 2001 2002 case Bytecodes::_drem: 2003 if (Matcher::has_match_rule(Op_ModD)) { 2004 // Generate a ModD node. 2005 b = pop_pair(); 2006 a = pop_pair(); 2007 // a % b 2008 2009 c = _gvn.transform( new ModDNode(0,a,b) ); 2010 d = dprecision_rounding(c); 2011 push_pair( d ); 2012 } 2013 else { 2014 // Generate a call. 2015 modd(); 2016 } 2017 break; 2018 2019 case Bytecodes::_dcmpl: 2020 b = pop_pair(); 2021 a = pop_pair(); 2022 c = _gvn.transform( new CmpD3Node( a, b)); 2023 push(c); 2024 break; 2025 2026 case Bytecodes::_dcmpg: 2027 b = pop_pair(); 2028 a = pop_pair(); 2029 // Same as dcmpl but need to flip the unordered case. 2030 // Commute the inputs, which negates the result sign except for unordered. 2031 // Flip the unordered as well by using CmpD3 which implements 2032 // unordered-lesser instead of unordered-greater semantics. 2033 // Finally, negate the result bits. Result is same as using a 2034 // CmpD3Greater except we did it with CmpD3 alone. 2035 c = _gvn.transform( new CmpD3Node( b, a)); 2036 c = _gvn.transform( new SubINode(_gvn.intcon(0),c) ); 2037 push(c); 2038 break; 2039 2040 2041 // Note for longs -> lo word is on TOS, hi word is on TOS - 1 2042 case Bytecodes::_land: 2043 b = pop_pair(); 2044 a = pop_pair(); 2045 c = _gvn.transform( new AndLNode(a,b) ); 2046 push_pair(c); 2047 break; 2048 case Bytecodes::_lor: 2049 b = pop_pair(); 2050 a = pop_pair(); 2051 c = _gvn.transform( new OrLNode(a,b) ); 2052 push_pair(c); 2053 break; 2054 case Bytecodes::_lxor: 2055 b = pop_pair(); 2056 a = pop_pair(); 2057 c = _gvn.transform( new XorLNode(a,b) ); 2058 push_pair(c); 2059 break; 2060 2061 case Bytecodes::_lshl: 2062 b = pop(); // the shift count 2063 a = pop_pair(); // value to be shifted 2064 c = _gvn.transform( new LShiftLNode(a,b) ); 2065 push_pair(c); 2066 break; 2067 case Bytecodes::_lshr: 2068 b = pop(); // the shift count 2069 a = pop_pair(); // value to be shifted 2070 c = _gvn.transform( new RShiftLNode(a,b) ); 2071 push_pair(c); 2072 break; 2073 case Bytecodes::_lushr: 2074 b = pop(); // the shift count 2075 a = pop_pair(); // value to be shifted 2076 c = _gvn.transform( new URShiftLNode(a,b) ); 2077 push_pair(c); 2078 break; 2079 case Bytecodes::_lmul: 2080 b = pop_pair(); 2081 a = pop_pair(); 2082 c = _gvn.transform( new MulLNode(a,b) ); 2083 push_pair(c); 2084 break; 2085 2086 case Bytecodes::_lrem: 2087 // Must keep both values on the expression-stack during null-check 2088 assert(peek(0) == top(), "long word order"); 2089 zero_check_long(peek(1)); 2090 // Compile-time detect of null-exception? 2091 if (stopped()) return; 2092 b = pop_pair(); 2093 a = pop_pair(); 2094 c = _gvn.transform( new ModLNode(control(),a,b) ); 2095 push_pair(c); 2096 break; 2097 2098 case Bytecodes::_ldiv: 2099 // Must keep both values on the expression-stack during null-check 2100 assert(peek(0) == top(), "long word order"); 2101 zero_check_long(peek(1)); 2102 // Compile-time detect of null-exception? 2103 if (stopped()) return; 2104 b = pop_pair(); 2105 a = pop_pair(); 2106 c = _gvn.transform( new DivLNode(control(),a,b) ); 2107 push_pair(c); 2108 break; 2109 2110 case Bytecodes::_ladd: 2111 b = pop_pair(); 2112 a = pop_pair(); 2113 c = _gvn.transform( new AddLNode(a,b) ); 2114 push_pair(c); 2115 break; 2116 case Bytecodes::_lsub: 2117 b = pop_pair(); 2118 a = pop_pair(); 2119 c = _gvn.transform( new SubLNode(a,b) ); 2120 push_pair(c); 2121 break; 2122 case Bytecodes::_lcmp: 2123 // Safepoints are now inserted _before_ branches. The long-compare 2124 // bytecode painfully produces a 3-way value (-1,0,+1) which requires a 2125 // slew of control flow. These are usually followed by a CmpI vs zero and 2126 // a branch; this pattern then optimizes to the obvious long-compare and 2127 // branch. However, if the branch is backwards there's a Safepoint 2128 // inserted. The inserted Safepoint captures the JVM state at the 2129 // pre-branch point, i.e. it captures the 3-way value. Thus if a 2130 // long-compare is used to control a loop the debug info will force 2131 // computation of the 3-way value, even though the generated code uses a 2132 // long-compare and branch. We try to rectify the situation by inserting 2133 // a SafePoint here and have it dominate and kill the safepoint added at a 2134 // following backwards branch. At this point the JVM state merely holds 2 2135 // longs but not the 3-way value. 2136 if( UseLoopSafepoints ) { 2137 switch( iter().next_bc() ) { 2138 case Bytecodes::_ifgt: 2139 case Bytecodes::_iflt: 2140 case Bytecodes::_ifge: 2141 case Bytecodes::_ifle: 2142 case Bytecodes::_ifne: 2143 case Bytecodes::_ifeq: 2144 // If this is a backwards branch in the bytecodes, add Safepoint 2145 maybe_add_safepoint(iter().next_get_dest()); 2146 } 2147 } 2148 b = pop_pair(); 2149 a = pop_pair(); 2150 c = _gvn.transform( new CmpL3Node( a, b )); 2151 push(c); 2152 break; 2153 2154 case Bytecodes::_lneg: 2155 a = pop_pair(); 2156 b = _gvn.transform( new SubLNode(longcon(0),a)); 2157 push_pair(b); 2158 break; 2159 case Bytecodes::_l2i: 2160 a = pop_pair(); 2161 push( _gvn.transform( new ConvL2INode(a))); 2162 break; 2163 case Bytecodes::_i2l: 2164 a = pop(); 2165 b = _gvn.transform( new ConvI2LNode(a)); 2166 push_pair(b); 2167 break; 2168 case Bytecodes::_i2b: 2169 // Sign extend 2170 a = pop(); 2171 a = _gvn.transform( new LShiftINode(a,_gvn.intcon(24)) ); 2172 a = _gvn.transform( new RShiftINode(a,_gvn.intcon(24)) ); 2173 push( a ); 2174 break; 2175 case Bytecodes::_i2s: 2176 a = pop(); 2177 a = _gvn.transform( new LShiftINode(a,_gvn.intcon(16)) ); 2178 a = _gvn.transform( new RShiftINode(a,_gvn.intcon(16)) ); 2179 push( a ); 2180 break; 2181 case Bytecodes::_i2c: 2182 a = pop(); 2183 push( _gvn.transform( new AndINode(a,_gvn.intcon(0xFFFF)) ) ); 2184 break; 2185 2186 case Bytecodes::_i2f: 2187 a = pop(); 2188 b = _gvn.transform( new ConvI2FNode(a) ) ; 2189 c = precision_rounding(b); 2190 push (b); 2191 break; 2192 2193 case Bytecodes::_i2d: 2194 a = pop(); 2195 b = _gvn.transform( new ConvI2DNode(a)); 2196 push_pair(b); 2197 break; 2198 2199 case Bytecodes::_iinc: // Increment local 2200 i = iter().get_index(); // Get local index 2201 set_local( i, _gvn.transform( new AddINode( _gvn.intcon(iter().get_iinc_con()), local(i) ) ) ); 2202 break; 2203 2204 // Exit points of synchronized methods must have an unlock node 2205 case Bytecodes::_return: 2206 return_current(NULL); 2207 break; 2208 2209 case Bytecodes::_ireturn: 2210 case Bytecodes::_areturn: 2211 case Bytecodes::_freturn: 2212 return_current(pop()); 2213 break; 2214 case Bytecodes::_lreturn: 2215 return_current(pop_pair()); 2216 break; 2217 case Bytecodes::_dreturn: 2218 return_current(pop_pair()); 2219 break; 2220 2221 case Bytecodes::_athrow: 2222 // null exception oop throws NULL pointer exception 2223 null_check(peek()); 2224 if (stopped()) return; 2225 // Hook the thrown exception directly to subsequent handlers. 2226 if (BailoutToInterpreterForThrows) { 2227 // Keep method interpreted from now on. 2228 uncommon_trap(Deoptimization::Reason_unhandled, 2229 Deoptimization::Action_make_not_compilable); 2230 return; 2231 } 2232 if (env()->jvmti_can_post_on_exceptions()) { 2233 // check if we must post exception events, take uncommon trap if so (with must_throw = false) 2234 uncommon_trap_if_should_post_on_exceptions(Deoptimization::Reason_unhandled, false); 2235 } 2236 // Here if either can_post_on_exceptions or should_post_on_exceptions is false 2237 add_exception_state(make_exception_state(peek())); 2238 break; 2239 2240 case Bytecodes::_goto: // fall through 2241 case Bytecodes::_goto_w: { 2242 int target_bci = (bc() == Bytecodes::_goto) ? iter().get_dest() : iter().get_far_dest(); 2243 2244 // If this is a backwards branch in the bytecodes, add Safepoint 2245 maybe_add_safepoint(target_bci); 2246 2247 // Update method data 2248 profile_taken_branch(target_bci); 2249 2250 // Merge the current control into the target basic block 2251 merge(target_bci); 2252 2253 // See if we can get some profile data and hand it off to the next block 2254 Block *target_block = block()->successor_for_bci(target_bci); 2255 if (target_block->pred_count() != 1) break; 2256 ciMethodData* methodData = method()->method_data(); 2257 if (!methodData->is_mature()) break; 2258 ciProfileData* data = methodData->bci_to_data(bci()); 2259 assert( data->is_JumpData(), "" ); 2260 int taken = ((ciJumpData*)data)->taken(); 2261 taken = method()->scale_count(taken); 2262 target_block->set_count(taken); 2263 break; 2264 } 2265 2266 case Bytecodes::_ifnull: btest = BoolTest::eq; goto handle_if_null; 2267 case Bytecodes::_ifnonnull: btest = BoolTest::ne; goto handle_if_null; 2268 handle_if_null: 2269 // If this is a backwards branch in the bytecodes, add Safepoint 2270 maybe_add_safepoint(iter().get_dest()); 2271 a = null(); 2272 b = pop(); 2273 if (!_gvn.type(b)->speculative_maybe_null() && 2274 !too_many_traps(Deoptimization::Reason_speculate_null_check)) { 2275 inc_sp(1); 2276 Node* null_ctl = top(); 2277 b = null_check_oop(b, &null_ctl, true, true, true); 2278 assert(null_ctl->is_top(), "no null control here"); 2279 dec_sp(1); 2280 } 2281 c = _gvn.transform( new CmpPNode(b, a) ); 2282 do_ifnull(btest, c); 2283 break; 2284 2285 case Bytecodes::_if_acmpeq: btest = BoolTest::eq; goto handle_if_acmp; 2286 case Bytecodes::_if_acmpne: btest = BoolTest::ne; goto handle_if_acmp; 2287 handle_if_acmp: 2288 // If this is a backwards branch in the bytecodes, add Safepoint 2289 maybe_add_safepoint(iter().get_dest()); 2290 a = pop(); 2291 b = pop(); 2292 c = _gvn.transform( new CmpPNode(b, a) ); 2293 c = optimize_cmp_with_klass(c); 2294 do_if(btest, c); 2295 break; 2296 2297 case Bytecodes::_ifeq: btest = BoolTest::eq; goto handle_ifxx; 2298 case Bytecodes::_ifne: btest = BoolTest::ne; goto handle_ifxx; 2299 case Bytecodes::_iflt: btest = BoolTest::lt; goto handle_ifxx; 2300 case Bytecodes::_ifle: btest = BoolTest::le; goto handle_ifxx; 2301 case Bytecodes::_ifgt: btest = BoolTest::gt; goto handle_ifxx; 2302 case Bytecodes::_ifge: btest = BoolTest::ge; goto handle_ifxx; 2303 handle_ifxx: 2304 // If this is a backwards branch in the bytecodes, add Safepoint 2305 maybe_add_safepoint(iter().get_dest()); 2306 a = _gvn.intcon(0); 2307 b = pop(); 2308 c = _gvn.transform( new CmpINode(b, a) ); 2309 do_if(btest, c); 2310 break; 2311 2312 case Bytecodes::_if_icmpeq: btest = BoolTest::eq; goto handle_if_icmp; 2313 case Bytecodes::_if_icmpne: btest = BoolTest::ne; goto handle_if_icmp; 2314 case Bytecodes::_if_icmplt: btest = BoolTest::lt; goto handle_if_icmp; 2315 case Bytecodes::_if_icmple: btest = BoolTest::le; goto handle_if_icmp; 2316 case Bytecodes::_if_icmpgt: btest = BoolTest::gt; goto handle_if_icmp; 2317 case Bytecodes::_if_icmpge: btest = BoolTest::ge; goto handle_if_icmp; 2318 handle_if_icmp: 2319 // If this is a backwards branch in the bytecodes, add Safepoint 2320 maybe_add_safepoint(iter().get_dest()); 2321 a = pop(); 2322 b = pop(); 2323 c = _gvn.transform( new CmpINode( b, a ) ); 2324 do_if(btest, c); 2325 break; 2326 2327 case Bytecodes::_tableswitch: 2328 do_tableswitch(); 2329 break; 2330 2331 case Bytecodes::_lookupswitch: 2332 do_lookupswitch(); 2333 break; 2334 2335 case Bytecodes::_invokestatic: 2336 case Bytecodes::_invokedynamic: 2337 case Bytecodes::_invokespecial: 2338 case Bytecodes::_invokevirtual: 2339 case Bytecodes::_invokeinterface: 2340 do_call(); 2341 break; 2342 case Bytecodes::_checkcast: 2343 do_checkcast(); 2344 break; 2345 case Bytecodes::_instanceof: 2346 do_instanceof(); 2347 break; 2348 case Bytecodes::_anewarray: 2349 do_anewarray(); 2350 break; 2351 case Bytecodes::_newarray: 2352 do_newarray((BasicType)iter().get_index()); 2353 break; 2354 case Bytecodes::_multianewarray: 2355 do_multianewarray(); 2356 break; 2357 case Bytecodes::_new: 2358 do_new(); 2359 break; 2360 2361 case Bytecodes::_jsr: 2362 case Bytecodes::_jsr_w: 2363 do_jsr(); 2364 break; 2365 2366 case Bytecodes::_ret: 2367 do_ret(); 2368 break; 2369 2370 2371 case Bytecodes::_monitorenter: 2372 do_monitor_enter(); 2373 break; 2374 2375 case Bytecodes::_monitorexit: 2376 do_monitor_exit(); 2377 break; 2378 2379 case Bytecodes::_breakpoint: 2380 // Breakpoint set concurrently to compile 2381 // %%% use an uncommon trap? 2382 C->record_failure("breakpoint in method"); 2383 return; 2384 2385 default: 2386 #ifndef PRODUCT 2387 map()->dump(99); 2388 #endif 2389 tty->print("\nUnhandled bytecode %s\n", Bytecodes::name(bc()) ); 2390 ShouldNotReachHere(); 2391 } 2392 2393 #ifndef PRODUCT 2394 IdealGraphPrinter *printer = IdealGraphPrinter::printer(); 2395 if (printer && printer->should_print(_method)) { 2396 char buffer[256]; 2397 sprintf(buffer, "Bytecode %d: %s", bci(), Bytecodes::name(bc())); 2398 bool old = printer->traverse_outs(); 2399 printer->set_traverse_outs(true); 2400 printer->print_method(C, buffer, 4); 2401 printer->set_traverse_outs(old); 2402 } 2403 #endif 2404 }