1 /* 2 * Copyright (c) 2005, 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/bcEscapeAnalyzer.hpp" 27 #include "ci/ciConstant.hpp" 28 #include "ci/ciField.hpp" 29 #include "ci/ciMethodBlocks.hpp" 30 #include "ci/ciStreams.hpp" 31 #include "interpreter/bytecode.hpp" 32 #include "utilities/bitMap.inline.hpp" 33 34 35 36 #ifndef PRODUCT 37 #define TRACE_BCEA(level, code) \ 38 if (EstimateArgEscape && BCEATraceLevel >= level) { \ 39 code; \ 40 } 41 #else 42 #define TRACE_BCEA(level, code) 43 #endif 44 45 // Maintain a map of which arguments a local variable or 46 // stack slot may contain. In addition to tracking 47 // arguments, it tracks two special values, "allocated" 48 // which represents any object allocated in the current 49 // method, and "unknown" which is any other object. 50 // Up to 30 arguments are handled, with the last one 51 // representing summary information for any extra arguments 52 class BCEscapeAnalyzer::ArgumentMap { 53 uint _bits; 54 enum {MAXBIT = 29, 55 ALLOCATED = 1, 56 UNKNOWN = 2}; 57 58 uint int_to_bit(uint e) const { 59 if (e > MAXBIT) 60 e = MAXBIT; 61 return (1 << (e + 2)); 62 } 63 64 public: 65 ArgumentMap() { _bits = 0;} 66 void set_bits(uint bits) { _bits = bits;} 67 uint get_bits() const { return _bits;} 68 void clear() { _bits = 0;} 69 void set_all() { _bits = ~0u; } 70 bool is_empty() const { return _bits == 0; } 71 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } 72 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } 73 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } 74 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } 75 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } 76 void set(uint var) { _bits = int_to_bit(var); } 77 void add(uint var) { _bits |= int_to_bit(var); } 78 void add_unknown() { _bits = UNKNOWN; } 79 void add_allocated() { _bits = ALLOCATED; } 80 void set_union(const ArgumentMap &am) { _bits |= am._bits; } 81 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } 82 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } 83 void operator=(const ArgumentMap &am) { _bits = am._bits; } 84 bool operator==(const ArgumentMap &am) { return _bits == am._bits; } 85 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } 86 }; 87 88 class BCEscapeAnalyzer::StateInfo { 89 public: 90 ArgumentMap *_vars; 91 ArgumentMap *_stack; 92 int _stack_height; 93 int _max_stack; 94 bool _initialized; 95 ArgumentMap empty_map; 96 97 StateInfo() { 98 empty_map.clear(); 99 } 100 101 ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } 102 ArgumentMap apop() { return raw_pop(); } 103 void spop() { raw_pop(); } 104 void lpop() { spop(); spop(); } 105 void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } 106 void apush(ArgumentMap i) { raw_push(i); } 107 void spush() { raw_push(empty_map); } 108 void lpush() { spush(); spush(); } 109 110 }; 111 112 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) { 113 for (int i = 0; i < _arg_size; i++) { 114 if (vars.contains(i)) 115 _arg_returned.set(i); 116 } 117 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); 118 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); 119 } 120 121 // return true if any element of vars is an argument 122 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { 123 for (int i = 0; i < _arg_size; i++) { 124 if (vars.contains(i)) 125 return true; 126 } 127 return false; 128 } 129 130 // return true if any element of vars is an arg_stack argument 131 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ 132 if (_conservative) 133 return true; 134 for (int i = 0; i < _arg_size; i++) { 135 if (vars.contains(i) && _arg_stack.test(i)) 136 return true; 137 } 138 return false; 139 } 140 141 // return true if all argument elements of vars are returned 142 bool BCEscapeAnalyzer::returns_all(ArgumentMap vars) { 143 for (int i = 0; i < _arg_size; i++) { 144 if (vars.contains(i) && !_arg_returned.test(i)) { 145 return false; 146 } 147 } 148 return true; 149 } 150 151 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) { 152 for (int i = 0; i < _arg_size; i++) { 153 if (vars.contains(i)) { 154 bm >>= i; 155 } 156 } 157 } 158 159 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { 160 clear_bits(vars, _arg_local); 161 if (vars.contains_allocated()) { 162 _allocated_escapes = true; 163 } 164 } 165 166 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars, bool merge) { 167 clear_bits(vars, _arg_local); 168 clear_bits(vars, _arg_stack); 169 if (vars.contains_allocated()) 170 _allocated_escapes = true; 171 172 if (merge && !vars.is_empty()) { 173 // Merge new state into already processed block. 174 // New state is not taken into account and 175 // it may invalidate set_returned() result. 176 if (vars.contains_unknown() || vars.contains_allocated()) { 177 _return_local = false; 178 } 179 if (vars.contains_unknown() || vars.contains_vars()) { 180 _return_allocated = false; 181 } 182 if (_return_local && vars.contains_vars() && !returns_all(vars)) { 183 // Return result should be invalidated if args in new 184 // state are not recorded in return state. 185 _return_local = false; 186 } 187 } 188 } 189 190 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { 191 clear_bits(vars, _dirty); 192 } 193 194 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { 195 196 for (int i = 0; i < _arg_size; i++) { 197 if (vars.contains(i)) { 198 set_arg_modified(i, offs, size); 199 } 200 } 201 if (vars.contains_unknown()) 202 _unknown_modified = true; 203 } 204 205 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { 206 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { 207 if (scope->method() == callee) { 208 return true; 209 } 210 } 211 return false; 212 } 213 214 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { 215 if (offset == OFFSET_ANY) 216 return _arg_modified[arg] != 0; 217 assert(arg >= 0 && arg < _arg_size, "must be an argument."); 218 bool modified = false; 219 int l = offset / HeapWordSize; 220 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; 221 if (l > ARG_OFFSET_MAX) 222 l = ARG_OFFSET_MAX; 223 if (h > ARG_OFFSET_MAX+1) 224 h = ARG_OFFSET_MAX + 1; 225 for (int i = l; i < h; i++) { 226 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; 227 } 228 return modified; 229 } 230 231 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { 232 if (offset == OFFSET_ANY) { 233 _arg_modified[arg] = (uint) -1; 234 return; 235 } 236 assert(arg >= 0 && arg < _arg_size, "must be an argument."); 237 int l = offset / HeapWordSize; 238 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; 239 if (l > ARG_OFFSET_MAX) 240 l = ARG_OFFSET_MAX; 241 if (h > ARG_OFFSET_MAX+1) 242 h = ARG_OFFSET_MAX + 1; 243 for (int i = l; i < h; i++) { 244 _arg_modified[arg] |= (1 << i); 245 } 246 } 247 248 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { 249 int i; 250 251 // retrieve information about the callee 252 ciInstanceKlass* klass = target->holder(); 253 ciInstanceKlass* calling_klass = method()->holder(); 254 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); 255 ciInstanceKlass* actual_recv = callee_holder; 256 257 // Some methods are obviously bindable without any type checks so 258 // convert them directly to an invokespecial or invokestatic. 259 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { 260 switch (code) { 261 case Bytecodes::_invokevirtual: 262 code = Bytecodes::_invokespecial; 263 break; 264 case Bytecodes::_invokehandle: 265 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; 266 break; 267 } 268 } 269 270 // compute size of arguments 271 int arg_size = target->invoke_arg_size(code); 272 int arg_base = MAX2(state._stack_height - arg_size, 0); 273 274 // direct recursive calls are skipped if they can be bound statically without introducing 275 // dependencies and if parameters are passed at the same position as in the current method 276 // other calls are skipped if there are no unescaped arguments passed to them 277 bool directly_recursive = (method() == target) && 278 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); 279 280 // check if analysis of callee can safely be skipped 281 bool skip_callee = true; 282 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { 283 ArgumentMap arg = state._stack[i]; 284 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); 285 } 286 // For now we conservatively skip invokedynamic. 287 if (code == Bytecodes::_invokedynamic) { 288 skip_callee = true; 289 } 290 if (skip_callee) { 291 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); 292 for (i = 0; i < arg_size; i++) { 293 set_method_escape(state.raw_pop()); 294 } 295 _unknown_modified = true; // assume the worst since we don't analyze the called method 296 return; 297 } 298 299 // determine actual method (use CHA if necessary) 300 ciMethod* inline_target = NULL; 301 if (target->is_loaded() && klass->is_loaded() 302 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) 303 && target->is_loaded()) { 304 if (code == Bytecodes::_invokestatic 305 || code == Bytecodes::_invokespecial 306 || code == Bytecodes::_invokevirtual && target->is_final_method()) { 307 inline_target = target; 308 } else { 309 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); 310 } 311 } 312 313 if (inline_target != NULL && !is_recursive_call(inline_target)) { 314 // analyze callee 315 BCEscapeAnalyzer analyzer(inline_target, this); 316 317 // adjust escape state of actual parameters 318 bool must_record_dependencies = false; 319 for (i = arg_size - 1; i >= 0; i--) { 320 ArgumentMap arg = state.raw_pop(); 321 // Check if callee arg is a caller arg or an allocated object 322 bool allocated = arg.contains_allocated(); 323 if (!(is_argument(arg) || allocated)) 324 continue; 325 for (int j = 0; j < _arg_size; j++) { 326 if (arg.contains(j)) { 327 _arg_modified[j] |= analyzer._arg_modified[i]; 328 } 329 } 330 if (!(is_arg_stack(arg) || allocated)) { 331 // arguments have already been recognized as escaping 332 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { 333 set_method_escape(arg); 334 must_record_dependencies = true; 335 } else { 336 set_global_escape(arg); 337 } 338 } 339 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); 340 341 // record dependencies if at least one parameter retained stack-allocatable 342 if (must_record_dependencies) { 343 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { 344 _dependencies.append(actual_recv); 345 _dependencies.append(inline_target); 346 } 347 _dependencies.appendAll(analyzer.dependencies()); 348 } 349 } else { 350 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", 351 target->name()->as_utf8())); 352 // conservatively mark all actual parameters as escaping globally 353 for (i = 0; i < arg_size; i++) { 354 ArgumentMap arg = state.raw_pop(); 355 if (!is_argument(arg)) 356 continue; 357 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); 358 set_global_escape(arg); 359 } 360 _unknown_modified = true; // assume the worst since we don't know the called method 361 } 362 } 363 364 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { 365 return ((~arg_set1) | arg_set2) == 0; 366 } 367 368 369 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { 370 371 blk->set_processed(); 372 ciBytecodeStream s(method()); 373 int limit_bci = blk->limit_bci(); 374 bool fall_through = false; 375 ArgumentMap allocated_obj; 376 allocated_obj.add_allocated(); 377 ArgumentMap unknown_obj; 378 unknown_obj.add_unknown(); 379 ArgumentMap empty_map; 380 381 s.reset_to_bci(blk->start_bci()); 382 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { 383 fall_through = true; 384 switch (s.cur_bc()) { 385 case Bytecodes::_nop: 386 break; 387 case Bytecodes::_aconst_null: 388 state.apush(unknown_obj); 389 break; 390 case Bytecodes::_iconst_m1: 391 case Bytecodes::_iconst_0: 392 case Bytecodes::_iconst_1: 393 case Bytecodes::_iconst_2: 394 case Bytecodes::_iconst_3: 395 case Bytecodes::_iconst_4: 396 case Bytecodes::_iconst_5: 397 case Bytecodes::_fconst_0: 398 case Bytecodes::_fconst_1: 399 case Bytecodes::_fconst_2: 400 case Bytecodes::_bipush: 401 case Bytecodes::_sipush: 402 state.spush(); 403 break; 404 case Bytecodes::_lconst_0: 405 case Bytecodes::_lconst_1: 406 case Bytecodes::_dconst_0: 407 case Bytecodes::_dconst_1: 408 state.lpush(); 409 break; 410 case Bytecodes::_ldc: 411 case Bytecodes::_ldc_w: 412 case Bytecodes::_ldc2_w: 413 { 414 // Avoid calling get_constant() which will try to allocate 415 // unloaded constant. We need only constant's type. 416 int index = s.get_constant_pool_index(); 417 constantTag tag = s.get_constant_pool_tag(index); 418 if (tag.is_long() || tag.is_double()) { 419 // Only longs and doubles use 2 stack slots. 420 state.lpush(); 421 } else if (tag.basic_type() == T_OBJECT) { 422 state.apush(unknown_obj); 423 } else { 424 state.spush(); 425 } 426 break; 427 } 428 case Bytecodes::_aload: 429 state.apush(state._vars[s.get_index()]); 430 break; 431 case Bytecodes::_iload: 432 case Bytecodes::_fload: 433 case Bytecodes::_iload_0: 434 case Bytecodes::_iload_1: 435 case Bytecodes::_iload_2: 436 case Bytecodes::_iload_3: 437 case Bytecodes::_fload_0: 438 case Bytecodes::_fload_1: 439 case Bytecodes::_fload_2: 440 case Bytecodes::_fload_3: 441 state.spush(); 442 break; 443 case Bytecodes::_lload: 444 case Bytecodes::_dload: 445 case Bytecodes::_lload_0: 446 case Bytecodes::_lload_1: 447 case Bytecodes::_lload_2: 448 case Bytecodes::_lload_3: 449 case Bytecodes::_dload_0: 450 case Bytecodes::_dload_1: 451 case Bytecodes::_dload_2: 452 case Bytecodes::_dload_3: 453 state.lpush(); 454 break; 455 case Bytecodes::_aload_0: 456 state.apush(state._vars[0]); 457 break; 458 case Bytecodes::_aload_1: 459 state.apush(state._vars[1]); 460 break; 461 case Bytecodes::_aload_2: 462 state.apush(state._vars[2]); 463 break; 464 case Bytecodes::_aload_3: 465 state.apush(state._vars[3]); 466 break; 467 case Bytecodes::_iaload: 468 case Bytecodes::_faload: 469 case Bytecodes::_baload: 470 case Bytecodes::_caload: 471 case Bytecodes::_saload: 472 state.spop(); 473 set_method_escape(state.apop()); 474 state.spush(); 475 break; 476 case Bytecodes::_laload: 477 case Bytecodes::_daload: 478 state.spop(); 479 set_method_escape(state.apop()); 480 state.lpush(); 481 break; 482 case Bytecodes::_aaload: 483 { state.spop(); 484 ArgumentMap array = state.apop(); 485 set_method_escape(array); 486 state.apush(unknown_obj); 487 set_dirty(array); 488 } 489 break; 490 case Bytecodes::_istore: 491 case Bytecodes::_fstore: 492 case Bytecodes::_istore_0: 493 case Bytecodes::_istore_1: 494 case Bytecodes::_istore_2: 495 case Bytecodes::_istore_3: 496 case Bytecodes::_fstore_0: 497 case Bytecodes::_fstore_1: 498 case Bytecodes::_fstore_2: 499 case Bytecodes::_fstore_3: 500 state.spop(); 501 break; 502 case Bytecodes::_lstore: 503 case Bytecodes::_dstore: 504 case Bytecodes::_lstore_0: 505 case Bytecodes::_lstore_1: 506 case Bytecodes::_lstore_2: 507 case Bytecodes::_lstore_3: 508 case Bytecodes::_dstore_0: 509 case Bytecodes::_dstore_1: 510 case Bytecodes::_dstore_2: 511 case Bytecodes::_dstore_3: 512 state.lpop(); 513 break; 514 case Bytecodes::_astore: 515 state._vars[s.get_index()] = state.apop(); 516 break; 517 case Bytecodes::_astore_0: 518 state._vars[0] = state.apop(); 519 break; 520 case Bytecodes::_astore_1: 521 state._vars[1] = state.apop(); 522 break; 523 case Bytecodes::_astore_2: 524 state._vars[2] = state.apop(); 525 break; 526 case Bytecodes::_astore_3: 527 state._vars[3] = state.apop(); 528 break; 529 case Bytecodes::_iastore: 530 case Bytecodes::_fastore: 531 case Bytecodes::_bastore: 532 case Bytecodes::_castore: 533 case Bytecodes::_sastore: 534 { 535 state.spop(); 536 state.spop(); 537 ArgumentMap arr = state.apop(); 538 set_method_escape(arr); 539 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); 540 break; 541 } 542 case Bytecodes::_lastore: 543 case Bytecodes::_dastore: 544 { 545 state.lpop(); 546 state.spop(); 547 ArgumentMap arr = state.apop(); 548 set_method_escape(arr); 549 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); 550 break; 551 } 552 case Bytecodes::_aastore: 553 { 554 set_global_escape(state.apop()); 555 state.spop(); 556 ArgumentMap arr = state.apop(); 557 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); 558 break; 559 } 560 case Bytecodes::_pop: 561 state.raw_pop(); 562 break; 563 case Bytecodes::_pop2: 564 state.raw_pop(); 565 state.raw_pop(); 566 break; 567 case Bytecodes::_dup: 568 { ArgumentMap w1 = state.raw_pop(); 569 state.raw_push(w1); 570 state.raw_push(w1); 571 } 572 break; 573 case Bytecodes::_dup_x1: 574 { ArgumentMap w1 = state.raw_pop(); 575 ArgumentMap w2 = state.raw_pop(); 576 state.raw_push(w1); 577 state.raw_push(w2); 578 state.raw_push(w1); 579 } 580 break; 581 case Bytecodes::_dup_x2: 582 { ArgumentMap w1 = state.raw_pop(); 583 ArgumentMap w2 = state.raw_pop(); 584 ArgumentMap w3 = state.raw_pop(); 585 state.raw_push(w1); 586 state.raw_push(w3); 587 state.raw_push(w2); 588 state.raw_push(w1); 589 } 590 break; 591 case Bytecodes::_dup2: 592 { ArgumentMap w1 = state.raw_pop(); 593 ArgumentMap w2 = state.raw_pop(); 594 state.raw_push(w2); 595 state.raw_push(w1); 596 state.raw_push(w2); 597 state.raw_push(w1); 598 } 599 break; 600 case Bytecodes::_dup2_x1: 601 { ArgumentMap w1 = state.raw_pop(); 602 ArgumentMap w2 = state.raw_pop(); 603 ArgumentMap w3 = state.raw_pop(); 604 state.raw_push(w2); 605 state.raw_push(w1); 606 state.raw_push(w3); 607 state.raw_push(w2); 608 state.raw_push(w1); 609 } 610 break; 611 case Bytecodes::_dup2_x2: 612 { ArgumentMap w1 = state.raw_pop(); 613 ArgumentMap w2 = state.raw_pop(); 614 ArgumentMap w3 = state.raw_pop(); 615 ArgumentMap w4 = state.raw_pop(); 616 state.raw_push(w2); 617 state.raw_push(w1); 618 state.raw_push(w4); 619 state.raw_push(w3); 620 state.raw_push(w2); 621 state.raw_push(w1); 622 } 623 break; 624 case Bytecodes::_swap: 625 { ArgumentMap w1 = state.raw_pop(); 626 ArgumentMap w2 = state.raw_pop(); 627 state.raw_push(w1); 628 state.raw_push(w2); 629 } 630 break; 631 case Bytecodes::_iadd: 632 case Bytecodes::_fadd: 633 case Bytecodes::_isub: 634 case Bytecodes::_fsub: 635 case Bytecodes::_imul: 636 case Bytecodes::_fmul: 637 case Bytecodes::_idiv: 638 case Bytecodes::_fdiv: 639 case Bytecodes::_irem: 640 case Bytecodes::_frem: 641 case Bytecodes::_iand: 642 case Bytecodes::_ior: 643 case Bytecodes::_ixor: 644 state.spop(); 645 state.spop(); 646 state.spush(); 647 break; 648 case Bytecodes::_ladd: 649 case Bytecodes::_dadd: 650 case Bytecodes::_lsub: 651 case Bytecodes::_dsub: 652 case Bytecodes::_lmul: 653 case Bytecodes::_dmul: 654 case Bytecodes::_ldiv: 655 case Bytecodes::_ddiv: 656 case Bytecodes::_lrem: 657 case Bytecodes::_drem: 658 case Bytecodes::_land: 659 case Bytecodes::_lor: 660 case Bytecodes::_lxor: 661 state.lpop(); 662 state.lpop(); 663 state.lpush(); 664 break; 665 case Bytecodes::_ishl: 666 case Bytecodes::_ishr: 667 case Bytecodes::_iushr: 668 state.spop(); 669 state.spop(); 670 state.spush(); 671 break; 672 case Bytecodes::_lshl: 673 case Bytecodes::_lshr: 674 case Bytecodes::_lushr: 675 state.spop(); 676 state.lpop(); 677 state.lpush(); 678 break; 679 case Bytecodes::_ineg: 680 case Bytecodes::_fneg: 681 state.spop(); 682 state.spush(); 683 break; 684 case Bytecodes::_lneg: 685 case Bytecodes::_dneg: 686 state.lpop(); 687 state.lpush(); 688 break; 689 case Bytecodes::_iinc: 690 break; 691 case Bytecodes::_i2l: 692 case Bytecodes::_i2d: 693 case Bytecodes::_f2l: 694 case Bytecodes::_f2d: 695 state.spop(); 696 state.lpush(); 697 break; 698 case Bytecodes::_i2f: 699 case Bytecodes::_f2i: 700 state.spop(); 701 state.spush(); 702 break; 703 case Bytecodes::_l2i: 704 case Bytecodes::_l2f: 705 case Bytecodes::_d2i: 706 case Bytecodes::_d2f: 707 state.lpop(); 708 state.spush(); 709 break; 710 case Bytecodes::_l2d: 711 case Bytecodes::_d2l: 712 state.lpop(); 713 state.lpush(); 714 break; 715 case Bytecodes::_i2b: 716 case Bytecodes::_i2c: 717 case Bytecodes::_i2s: 718 state.spop(); 719 state.spush(); 720 break; 721 case Bytecodes::_lcmp: 722 case Bytecodes::_dcmpl: 723 case Bytecodes::_dcmpg: 724 state.lpop(); 725 state.lpop(); 726 state.spush(); 727 break; 728 case Bytecodes::_fcmpl: 729 case Bytecodes::_fcmpg: 730 state.spop(); 731 state.spop(); 732 state.spush(); 733 break; 734 case Bytecodes::_ifeq: 735 case Bytecodes::_ifne: 736 case Bytecodes::_iflt: 737 case Bytecodes::_ifge: 738 case Bytecodes::_ifgt: 739 case Bytecodes::_ifle: 740 { 741 state.spop(); 742 int dest_bci = s.get_dest(); 743 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 744 assert(s.next_bci() == limit_bci, "branch must end block"); 745 successors.push(_methodBlocks->block_containing(dest_bci)); 746 break; 747 } 748 case Bytecodes::_if_icmpeq: 749 case Bytecodes::_if_icmpne: 750 case Bytecodes::_if_icmplt: 751 case Bytecodes::_if_icmpge: 752 case Bytecodes::_if_icmpgt: 753 case Bytecodes::_if_icmple: 754 { 755 state.spop(); 756 state.spop(); 757 int dest_bci = s.get_dest(); 758 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 759 assert(s.next_bci() == limit_bci, "branch must end block"); 760 successors.push(_methodBlocks->block_containing(dest_bci)); 761 break; 762 } 763 case Bytecodes::_if_acmpeq: 764 case Bytecodes::_if_acmpne: 765 { 766 set_method_escape(state.apop()); 767 set_method_escape(state.apop()); 768 int dest_bci = s.get_dest(); 769 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 770 assert(s.next_bci() == limit_bci, "branch must end block"); 771 successors.push(_methodBlocks->block_containing(dest_bci)); 772 break; 773 } 774 case Bytecodes::_goto: 775 { 776 int dest_bci = s.get_dest(); 777 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 778 assert(s.next_bci() == limit_bci, "branch must end block"); 779 successors.push(_methodBlocks->block_containing(dest_bci)); 780 fall_through = false; 781 break; 782 } 783 case Bytecodes::_jsr: 784 { 785 int dest_bci = s.get_dest(); 786 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 787 assert(s.next_bci() == limit_bci, "branch must end block"); 788 state.apush(empty_map); 789 successors.push(_methodBlocks->block_containing(dest_bci)); 790 fall_through = false; 791 break; 792 } 793 case Bytecodes::_ret: 794 // we don't track the destination of a "ret" instruction 795 assert(s.next_bci() == limit_bci, "branch must end block"); 796 fall_through = false; 797 break; 798 case Bytecodes::_return: 799 assert(s.next_bci() == limit_bci, "return must end block"); 800 fall_through = false; 801 break; 802 case Bytecodes::_tableswitch: 803 { 804 state.spop(); 805 Bytecode_tableswitch sw(&s); 806 int len = sw.length(); 807 int dest_bci; 808 for (int i = 0; i < len; i++) { 809 dest_bci = s.cur_bci() + sw.dest_offset_at(i); 810 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 811 successors.push(_methodBlocks->block_containing(dest_bci)); 812 } 813 dest_bci = s.cur_bci() + sw.default_offset(); 814 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 815 successors.push(_methodBlocks->block_containing(dest_bci)); 816 assert(s.next_bci() == limit_bci, "branch must end block"); 817 fall_through = false; 818 break; 819 } 820 case Bytecodes::_lookupswitch: 821 { 822 state.spop(); 823 Bytecode_lookupswitch sw(&s); 824 int len = sw.number_of_pairs(); 825 int dest_bci; 826 for (int i = 0; i < len; i++) { 827 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); 828 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 829 successors.push(_methodBlocks->block_containing(dest_bci)); 830 } 831 dest_bci = s.cur_bci() + sw.default_offset(); 832 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 833 successors.push(_methodBlocks->block_containing(dest_bci)); 834 fall_through = false; 835 break; 836 } 837 case Bytecodes::_ireturn: 838 case Bytecodes::_freturn: 839 state.spop(); 840 fall_through = false; 841 break; 842 case Bytecodes::_lreturn: 843 case Bytecodes::_dreturn: 844 state.lpop(); 845 fall_through = false; 846 break; 847 case Bytecodes::_areturn: 848 set_returned(state.apop()); 849 fall_through = false; 850 break; 851 case Bytecodes::_getstatic: 852 case Bytecodes::_getfield: 853 { bool ignored_will_link; 854 ciField* field = s.get_field(ignored_will_link); 855 BasicType field_type = field->type()->basic_type(); 856 if (s.cur_bc() != Bytecodes::_getstatic) { 857 set_method_escape(state.apop()); 858 } 859 if (field_type == T_OBJECT || field_type == T_ARRAY) { 860 state.apush(unknown_obj); 861 } else if (type2size[field_type] == 1) { 862 state.spush(); 863 } else { 864 state.lpush(); 865 } 866 } 867 break; 868 case Bytecodes::_putstatic: 869 case Bytecodes::_putfield: 870 { bool will_link; 871 ciField* field = s.get_field(will_link); 872 BasicType field_type = field->type()->basic_type(); 873 if (field_type == T_OBJECT || field_type == T_ARRAY) { 874 set_global_escape(state.apop()); 875 } else if (type2size[field_type] == 1) { 876 state.spop(); 877 } else { 878 state.lpop(); 879 } 880 if (s.cur_bc() != Bytecodes::_putstatic) { 881 ArgumentMap p = state.apop(); 882 set_method_escape(p); 883 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); 884 } 885 } 886 break; 887 case Bytecodes::_invokevirtual: 888 case Bytecodes::_invokespecial: 889 case Bytecodes::_invokestatic: 890 case Bytecodes::_invokedynamic: 891 case Bytecodes::_invokeinterface: 892 { bool ignored_will_link; 893 ciSignature* declared_signature = NULL; 894 ciMethod* target = s.get_method(ignored_will_link, &declared_signature); 895 ciKlass* holder = s.get_declared_method_holder(); 896 assert(declared_signature != NULL, "cannot be null"); 897 // Push appendix argument, if one. 898 if (s.has_appendix()) { 899 state.apush(unknown_obj); 900 } 901 // Pass in raw bytecode because we need to see invokehandle instructions. 902 invoke(state, s.cur_bc_raw(), target, holder); 903 // We are using the return type of the declared signature here because 904 // it might be a more concrete type than the one from the target (for 905 // e.g. invokedynamic and invokehandle). 906 ciType* return_type = declared_signature->return_type(); 907 if (!return_type->is_primitive_type()) { 908 state.apush(unknown_obj); 909 } else if (return_type->is_one_word()) { 910 state.spush(); 911 } else if (return_type->is_two_word()) { 912 state.lpush(); 913 } 914 } 915 break; 916 case Bytecodes::_new: 917 state.apush(allocated_obj); 918 break; 919 case Bytecodes::_newarray: 920 case Bytecodes::_anewarray: 921 state.spop(); 922 state.apush(allocated_obj); 923 break; 924 case Bytecodes::_multianewarray: 925 { int i = s.cur_bcp()[3]; 926 while (i-- > 0) state.spop(); 927 state.apush(allocated_obj); 928 } 929 break; 930 case Bytecodes::_arraylength: 931 set_method_escape(state.apop()); 932 state.spush(); 933 break; 934 case Bytecodes::_athrow: 935 set_global_escape(state.apop()); 936 fall_through = false; 937 break; 938 case Bytecodes::_checkcast: 939 { ArgumentMap obj = state.apop(); 940 set_method_escape(obj); 941 state.apush(obj); 942 } 943 break; 944 case Bytecodes::_instanceof: 945 set_method_escape(state.apop()); 946 state.spush(); 947 break; 948 case Bytecodes::_monitorenter: 949 case Bytecodes::_monitorexit: 950 state.apop(); 951 break; 952 case Bytecodes::_wide: 953 ShouldNotReachHere(); 954 break; 955 case Bytecodes::_ifnull: 956 case Bytecodes::_ifnonnull: 957 { 958 set_method_escape(state.apop()); 959 int dest_bci = s.get_dest(); 960 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 961 assert(s.next_bci() == limit_bci, "branch must end block"); 962 successors.push(_methodBlocks->block_containing(dest_bci)); 963 break; 964 } 965 case Bytecodes::_goto_w: 966 { 967 int dest_bci = s.get_far_dest(); 968 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 969 assert(s.next_bci() == limit_bci, "branch must end block"); 970 successors.push(_methodBlocks->block_containing(dest_bci)); 971 fall_through = false; 972 break; 973 } 974 case Bytecodes::_jsr_w: 975 { 976 int dest_bci = s.get_far_dest(); 977 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 978 assert(s.next_bci() == limit_bci, "branch must end block"); 979 state.apush(empty_map); 980 successors.push(_methodBlocks->block_containing(dest_bci)); 981 fall_through = false; 982 break; 983 } 984 case Bytecodes::_breakpoint: 985 break; 986 default: 987 ShouldNotReachHere(); 988 break; 989 } 990 991 } 992 if (fall_through) { 993 int fall_through_bci = s.cur_bci(); 994 if (fall_through_bci < _method->code_size()) { 995 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); 996 successors.push(_methodBlocks->block_containing(fall_through_bci)); 997 } 998 } 999 } 1000 1001 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { 1002 StateInfo *d_state = blockstates + dest->index(); 1003 int nlocals = _method->max_locals(); 1004 1005 // exceptions may cause transfer of control to handlers in the middle of a 1006 // block, so we don't merge the incoming state of exception handlers 1007 if (dest->is_handler()) 1008 return; 1009 if (!d_state->_initialized ) { 1010 // destination not initialized, just copy 1011 for (int i = 0; i < nlocals; i++) { 1012 d_state->_vars[i] = s_state->_vars[i]; 1013 } 1014 for (int i = 0; i < s_state->_stack_height; i++) { 1015 d_state->_stack[i] = s_state->_stack[i]; 1016 } 1017 d_state->_stack_height = s_state->_stack_height; 1018 d_state->_max_stack = s_state->_max_stack; 1019 d_state->_initialized = true; 1020 } else if (!dest->processed()) { 1021 // we have not yet walked the bytecodes of dest, we can merge 1022 // the states 1023 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); 1024 for (int i = 0; i < nlocals; i++) { 1025 d_state->_vars[i].set_union(s_state->_vars[i]); 1026 } 1027 for (int i = 0; i < s_state->_stack_height; i++) { 1028 d_state->_stack[i].set_union(s_state->_stack[i]); 1029 } 1030 } else { 1031 // the bytecodes of dest have already been processed, mark any 1032 // arguments in the source state which are not in the dest state 1033 // as global escape. 1034 // Future refinement: we only need to mark these variable to the 1035 // maximum escape of any variables in dest state 1036 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); 1037 ArgumentMap extra_vars; 1038 for (int i = 0; i < nlocals; i++) { 1039 ArgumentMap t; 1040 t = s_state->_vars[i]; 1041 t.set_difference(d_state->_vars[i]); 1042 extra_vars.set_union(t); 1043 } 1044 for (int i = 0; i < s_state->_stack_height; i++) { 1045 ArgumentMap t; 1046 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; 1047 t.clear(); 1048 t = s_state->_stack[i]; 1049 t.set_difference(d_state->_stack[i]); 1050 extra_vars.set_union(t); 1051 } 1052 set_global_escape(extra_vars, true); 1053 } 1054 } 1055 1056 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { 1057 int numblocks = _methodBlocks->num_blocks(); 1058 int stkSize = _method->max_stack(); 1059 int numLocals = _method->max_locals(); 1060 StateInfo state; 1061 1062 int datacount = (numblocks + 1) * (stkSize + numLocals); 1063 int datasize = datacount * sizeof(ArgumentMap); 1064 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); 1065 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); 1066 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); 1067 ArgumentMap *dp = statedata; 1068 state._vars = dp; 1069 dp += numLocals; 1070 state._stack = dp; 1071 dp += stkSize; 1072 state._initialized = false; 1073 state._max_stack = stkSize; 1074 for (int i = 0; i < numblocks; i++) { 1075 blockstates[i]._vars = dp; 1076 dp += numLocals; 1077 blockstates[i]._stack = dp; 1078 dp += stkSize; 1079 blockstates[i]._initialized = false; 1080 blockstates[i]._stack_height = 0; 1081 blockstates[i]._max_stack = stkSize; 1082 } 1083 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); 1084 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); 1085 1086 _methodBlocks->clear_processed(); 1087 1088 // initialize block 0 state from method signature 1089 ArgumentMap allVars; // all oop arguments to method 1090 ciSignature* sig = method()->signature(); 1091 int j = 0; 1092 ciBlock* first_blk = _methodBlocks->block_containing(0); 1093 int fb_i = first_blk->index(); 1094 if (!method()->is_static()) { 1095 // record information for "this" 1096 blockstates[fb_i]._vars[j].set(j); 1097 allVars.add(j); 1098 j++; 1099 } 1100 for (int i = 0; i < sig->count(); i++) { 1101 ciType* t = sig->type_at(i); 1102 if (!t->is_primitive_type()) { 1103 blockstates[fb_i]._vars[j].set(j); 1104 allVars.add(j); 1105 } 1106 j += t->size(); 1107 } 1108 blockstates[fb_i]._initialized = true; 1109 assert(j == _arg_size, "just checking"); 1110 1111 ArgumentMap unknown_map; 1112 unknown_map.add_unknown(); 1113 1114 worklist.push(first_blk); 1115 while(worklist.length() > 0) { 1116 ciBlock *blk = worklist.pop(); 1117 StateInfo *blkState = blockstates + blk->index(); 1118 if (blk->is_handler() || blk->is_ret_target()) { 1119 // for an exception handler or a target of a ret instruction, we assume the worst case, 1120 // that any variable could contain any argument 1121 for (int i = 0; i < numLocals; i++) { 1122 state._vars[i] = allVars; 1123 } 1124 if (blk->is_handler()) { 1125 state._stack_height = 1; 1126 } else { 1127 state._stack_height = blkState->_stack_height; 1128 } 1129 for (int i = 0; i < state._stack_height; i++) { 1130 // ??? should this be unknown_map ??? 1131 state._stack[i] = allVars; 1132 } 1133 } else { 1134 for (int i = 0; i < numLocals; i++) { 1135 state._vars[i] = blkState->_vars[i]; 1136 } 1137 for (int i = 0; i < blkState->_stack_height; i++) { 1138 state._stack[i] = blkState->_stack[i]; 1139 } 1140 state._stack_height = blkState->_stack_height; 1141 } 1142 iterate_one_block(blk, state, successors); 1143 // if this block has any exception handlers, push them 1144 // onto successor list 1145 if (blk->has_handler()) { 1146 DEBUG_ONLY(int handler_count = 0;) 1147 int blk_start = blk->start_bci(); 1148 int blk_end = blk->limit_bci(); 1149 for (int i = 0; i < numblocks; i++) { 1150 ciBlock *b = _methodBlocks->block(i); 1151 if (b->is_handler()) { 1152 int ex_start = b->ex_start_bci(); 1153 int ex_end = b->ex_limit_bci(); 1154 if ((ex_start >= blk_start && ex_start < blk_end) || 1155 (ex_end > blk_start && ex_end <= blk_end)) { 1156 successors.push(b); 1157 } 1158 DEBUG_ONLY(handler_count++;) 1159 } 1160 } 1161 assert(handler_count > 0, "must find at least one handler"); 1162 } 1163 // merge computed variable state with successors 1164 while(successors.length() > 0) { 1165 ciBlock *succ = successors.pop(); 1166 merge_block_states(blockstates, succ, &state); 1167 if (!succ->processed()) 1168 worklist.push(succ); 1169 } 1170 } 1171 } 1172 1173 void BCEscapeAnalyzer::do_analysis() { 1174 Arena* arena = CURRENT_ENV->arena(); 1175 // identify basic blocks 1176 _methodBlocks = _method->get_method_blocks(); 1177 1178 iterate_blocks(arena); 1179 } 1180 1181 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { 1182 vmIntrinsics::ID iid = method()->intrinsic_id(); 1183 if (iid == vmIntrinsics::_getClass || 1184 iid == vmIntrinsics::_fillInStackTrace || 1185 iid == vmIntrinsics::_hashCode) { 1186 return iid; 1187 } else { 1188 return vmIntrinsics::_none; 1189 } 1190 } 1191 1192 void BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { 1193 ArgumentMap arg; 1194 arg.clear(); 1195 switch (iid) { 1196 case vmIntrinsics::_getClass: 1197 _return_local = false; 1198 _return_allocated = false; 1199 break; 1200 case vmIntrinsics::_fillInStackTrace: 1201 arg.set(0); // 'this' 1202 set_returned(arg); 1203 break; 1204 case vmIntrinsics::_hashCode: 1205 // initialized state is correct 1206 break; 1207 default: 1208 assert(false, "unexpected intrinsic"); 1209 } 1210 } 1211 1212 void BCEscapeAnalyzer::initialize() { 1213 int i; 1214 1215 // clear escape information (method may have been deoptimized) 1216 methodData()->clear_escape_info(); 1217 1218 // initialize escape state of object parameters 1219 ciSignature* sig = method()->signature(); 1220 int j = 0; 1221 if (!method()->is_static()) { 1222 _arg_local.set(0); 1223 _arg_stack.set(0); 1224 j++; 1225 } 1226 for (i = 0; i < sig->count(); i++) { 1227 ciType* t = sig->type_at(i); 1228 if (!t->is_primitive_type()) { 1229 _arg_local.set(j); 1230 _arg_stack.set(j); 1231 } 1232 j += t->size(); 1233 } 1234 assert(j == _arg_size, "just checking"); 1235 1236 // start with optimistic assumption 1237 ciType *rt = _method->return_type(); 1238 if (rt->is_primitive_type()) { 1239 _return_local = false; 1240 _return_allocated = false; 1241 } else { 1242 _return_local = true; 1243 _return_allocated = true; 1244 } 1245 _allocated_escapes = false; 1246 _unknown_modified = false; 1247 } 1248 1249 void BCEscapeAnalyzer::clear_escape_info() { 1250 ciSignature* sig = method()->signature(); 1251 int arg_count = sig->count(); 1252 ArgumentMap var; 1253 if (!method()->is_static()) { 1254 arg_count++; // allow for "this" 1255 } 1256 for (int i = 0; i < arg_count; i++) { 1257 set_arg_modified(i, OFFSET_ANY, 4); 1258 var.clear(); 1259 var.set(i); 1260 set_modified(var, OFFSET_ANY, 4); 1261 set_global_escape(var); 1262 } 1263 _arg_local.Clear(); 1264 _arg_stack.Clear(); 1265 _arg_returned.Clear(); 1266 _return_local = false; 1267 _return_allocated = false; 1268 _allocated_escapes = true; 1269 _unknown_modified = true; 1270 } 1271 1272 1273 void BCEscapeAnalyzer::compute_escape_info() { 1274 int i; 1275 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); 1276 1277 vmIntrinsics::ID iid = known_intrinsic(); 1278 1279 // check if method can be analyzed 1280 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() 1281 || _level > MaxBCEAEstimateLevel 1282 || method()->code_size() > MaxBCEAEstimateSize)) { 1283 if (BCEATraceLevel >= 1) { 1284 tty->print("Skipping method because: "); 1285 if (method()->is_abstract()) 1286 tty->print_cr("method is abstract."); 1287 else if (method()->is_native()) 1288 tty->print_cr("method is native."); 1289 else if (!method()->holder()->is_initialized()) 1290 tty->print_cr("class of method is not initialized."); 1291 else if (_level > MaxBCEAEstimateLevel) 1292 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", 1293 _level, (int) MaxBCEAEstimateLevel); 1294 else if (method()->code_size() > MaxBCEAEstimateSize) 1295 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize (%d).", 1296 method()->code_size(), (int) MaxBCEAEstimateSize); 1297 else 1298 ShouldNotReachHere(); 1299 } 1300 clear_escape_info(); 1301 1302 return; 1303 } 1304 1305 if (BCEATraceLevel >= 1) { 1306 tty->print("[EA] estimating escape information for"); 1307 if (iid != vmIntrinsics::_none) 1308 tty->print(" intrinsic"); 1309 method()->print_short_name(); 1310 tty->print_cr(" (%d bytes)", method()->code_size()); 1311 } 1312 1313 initialize(); 1314 1315 // Do not scan method if it has no object parameters and 1316 // does not returns an object (_return_allocated is set in initialize()). 1317 if (_arg_local.Size() == 0 && !_return_allocated) { 1318 // Clear all info since method's bytecode was not analysed and 1319 // set pessimistic escape information. 1320 clear_escape_info(); 1321 methodData()->set_eflag(MethodData::allocated_escapes); 1322 methodData()->set_eflag(MethodData::unknown_modified); 1323 methodData()->set_eflag(MethodData::estimated); 1324 return; 1325 } 1326 1327 if (iid != vmIntrinsics::_none) 1328 compute_escape_for_intrinsic(iid); 1329 else { 1330 do_analysis(); 1331 } 1332 1333 // don't store interprocedural escape information if it introduces 1334 // dependencies or if method data is empty 1335 // 1336 if (!has_dependencies() && !methodData()->is_empty()) { 1337 for (i = 0; i < _arg_size; i++) { 1338 if (_arg_local.test(i)) { 1339 assert(_arg_stack.test(i), "inconsistent escape info"); 1340 methodData()->set_arg_local(i); 1341 methodData()->set_arg_stack(i); 1342 } else if (_arg_stack.test(i)) { 1343 methodData()->set_arg_stack(i); 1344 } 1345 if (_arg_returned.test(i)) { 1346 methodData()->set_arg_returned(i); 1347 } 1348 methodData()->set_arg_modified(i, _arg_modified[i]); 1349 } 1350 if (_return_local) { 1351 methodData()->set_eflag(MethodData::return_local); 1352 } 1353 if (_return_allocated) { 1354 methodData()->set_eflag(MethodData::return_allocated); 1355 } 1356 if (_allocated_escapes) { 1357 methodData()->set_eflag(MethodData::allocated_escapes); 1358 } 1359 if (_unknown_modified) { 1360 methodData()->set_eflag(MethodData::unknown_modified); 1361 } 1362 methodData()->set_eflag(MethodData::estimated); 1363 } 1364 } 1365 1366 void BCEscapeAnalyzer::read_escape_info() { 1367 assert(methodData()->has_escape_info(), "no escape info available"); 1368 1369 // read escape information from method descriptor 1370 for (int i = 0; i < _arg_size; i++) { 1371 if (methodData()->is_arg_local(i)) 1372 _arg_local.set(i); 1373 if (methodData()->is_arg_stack(i)) 1374 _arg_stack.set(i); 1375 if (methodData()->is_arg_returned(i)) 1376 _arg_returned.set(i); 1377 _arg_modified[i] = methodData()->arg_modified(i); 1378 } 1379 _return_local = methodData()->eflag_set(MethodData::return_local); 1380 _return_allocated = methodData()->eflag_set(MethodData::return_allocated); 1381 _allocated_escapes = methodData()->eflag_set(MethodData::allocated_escapes); 1382 _unknown_modified = methodData()->eflag_set(MethodData::unknown_modified); 1383 1384 } 1385 1386 #ifndef PRODUCT 1387 void BCEscapeAnalyzer::dump() { 1388 tty->print("[EA] estimated escape information for"); 1389 method()->print_short_name(); 1390 tty->print_cr(has_dependencies() ? " (not stored)" : ""); 1391 tty->print(" non-escaping args: "); 1392 _arg_local.print_on(tty); 1393 tty->print(" stack-allocatable args: "); 1394 _arg_stack.print_on(tty); 1395 if (_return_local) { 1396 tty->print(" returned args: "); 1397 _arg_returned.print_on(tty); 1398 } else if (is_return_allocated()) { 1399 tty->print_cr(" return allocated value"); 1400 } else { 1401 tty->print_cr(" return non-local value"); 1402 } 1403 tty->print(" modified args: "); 1404 for (int i = 0; i < _arg_size; i++) { 1405 if (_arg_modified[i] == 0) 1406 tty->print(" 0"); 1407 else 1408 tty->print(" 0x%x", _arg_modified[i]); 1409 } 1410 tty->cr(); 1411 tty->print(" flags: "); 1412 if (_return_allocated) 1413 tty->print(" return_allocated"); 1414 if (_allocated_escapes) 1415 tty->print(" allocated_escapes"); 1416 if (_unknown_modified) 1417 tty->print(" unknown_modified"); 1418 tty->cr(); 1419 } 1420 #endif 1421 1422 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) 1423 : _conservative(method == NULL || !EstimateArgEscape) 1424 , _arena(CURRENT_ENV->arena()) 1425 , _method(method) 1426 , _methodData(method ? method->method_data() : NULL) 1427 , _arg_size(method ? method->arg_size() : 0) 1428 , _arg_local(_arena) 1429 , _arg_stack(_arena) 1430 , _arg_returned(_arena) 1431 , _dirty(_arena) 1432 , _return_local(false) 1433 , _return_allocated(false) 1434 , _allocated_escapes(false) 1435 , _unknown_modified(false) 1436 , _dependencies(_arena, 4, 0, NULL) 1437 , _parent(parent) 1438 , _level(parent == NULL ? 0 : parent->level() + 1) { 1439 if (!_conservative) { 1440 _arg_local.Clear(); 1441 _arg_stack.Clear(); 1442 _arg_returned.Clear(); 1443 _dirty.Clear(); 1444 Arena* arena = CURRENT_ENV->arena(); 1445 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); 1446 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); 1447 1448 if (methodData() == NULL) 1449 return; 1450 bool printit = _method->should_print_assembly(); 1451 if (methodData()->has_escape_info()) { 1452 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", 1453 method->holder()->name()->as_utf8(), 1454 method->name()->as_utf8())); 1455 read_escape_info(); 1456 } else { 1457 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", 1458 method->holder()->name()->as_utf8(), 1459 method->name()->as_utf8())); 1460 1461 compute_escape_info(); 1462 methodData()->update_escape_info(); 1463 } 1464 #ifndef PRODUCT 1465 if (BCEATraceLevel >= 3) { 1466 // dump escape information 1467 dump(); 1468 } 1469 #endif 1470 } 1471 } 1472 1473 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { 1474 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { 1475 // Also record evol dependencies so redefinition of the 1476 // callee will trigger recompilation. 1477 deps->assert_evol_method(method()); 1478 } 1479 for (int i = 0; i < _dependencies.length(); i+=2) { 1480 ciKlass *k = _dependencies.at(i)->as_klass(); 1481 ciMethod *m = _dependencies.at(i+1)->as_method(); 1482 deps->assert_unique_concrete_method(k, m); 1483 } 1484 }