bcEscapeAnalyzer.cpp revision 5776:de6a9e811145
175597Ssobomax/* 275597Ssobomax * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. 375597Ssobomax * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 475597Ssobomax * 575597Ssobomax * This code is free software; you can redistribute it and/or modify it 675597Ssobomax * under the terms of the GNU General Public License version 2 only, as 775597Ssobomax * published by the Free Software Foundation. 875597Ssobomax * 975597Ssobomax * This code is distributed in the hope that it will be useful, but WITHOUT 1075597Ssobomax * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1175597Ssobomax * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1275597Ssobomax * version 2 for more details (a copy is included in the LICENSE file that 1375597Ssobomax * accompanied this code). 1475597Ssobomax * 1575597Ssobomax * You should have received a copy of the GNU General Public License version 1675597Ssobomax * 2 along with this work; if not, write to the Free Software Foundation, 1775597Ssobomax * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1875597Ssobomax * 1975597Ssobomax * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2075597Ssobomax * or visit www.oracle.com if you need additional information or have any 2175597Ssobomax * questions. 2275597Ssobomax * 2375597Ssobomax */ 2475597Ssobomax 2575597Ssobomax#include "precompiled.hpp" 2675597Ssobomax#include "ci/bcEscapeAnalyzer.hpp" 2775597Ssobomax#include "ci/ciConstant.hpp" 2875597Ssobomax#include "ci/ciField.hpp" 2975597Ssobomax#include "ci/ciMethodBlocks.hpp" 3086366Ssobomax#include "ci/ciStreams.hpp" 3186366Ssobomax#include "interpreter/bytecode.hpp" 3275597Ssobomax#include "utilities/bitMap.inline.hpp" 3375597Ssobomax 3475597Ssobomax 3575597Ssobomax 3675597Ssobomax#ifndef PRODUCT 3775597Ssobomax #define TRACE_BCEA(level, code) \ 3875597Ssobomax if (EstimateArgEscape && BCEATraceLevel >= level) { \ 3975597Ssobomax code; \ 4075597Ssobomax } 4175597Ssobomax#else 4275597Ssobomax #define TRACE_BCEA(level, code) 4375597Ssobomax#endif 4475597Ssobomax 4575597Ssobomax// Maintain a map of which aguments a local variable or 4675597Ssobomax// stack slot may contain. In addition to tracking 4775597Ssobomax// arguments, it tracks two special values, "allocated" 4875597Ssobomax// which represents any object allocated in the current 4975597Ssobomax// method, and "unknown" which is any other object. 5075597Ssobomax// Up to 30 arguments are handled, with the last one 5175597Ssobomax// representing summary information for any extra arguments 5275597Ssobomaxclass BCEscapeAnalyzer::ArgumentMap { 5375597Ssobomax uint _bits; 5475597Ssobomax enum {MAXBIT = 29, 5575597Ssobomax ALLOCATED = 1, 5675597Ssobomax UNKNOWN = 2}; 5775597Ssobomax 5875597Ssobomax uint int_to_bit(uint e) const { 5986366Ssobomax if (e > MAXBIT) 6075597Ssobomax e = MAXBIT; 6186366Ssobomax return (1 << (e + 2)); 6275597Ssobomax } 6375597Ssobomax 6475597Ssobomaxpublic: 6575597Ssobomax ArgumentMap() { _bits = 0;} 6675597Ssobomax void set_bits(uint bits) { _bits = bits;} 6775597Ssobomax uint get_bits() const { return _bits;} 6875597Ssobomax void clear() { _bits = 0;} 6975597Ssobomax void set_all() { _bits = ~0u; } 7075597Ssobomax bool is_empty() const { return _bits == 0; } 7186366Ssobomax bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } 7275597Ssobomax bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } 7375597Ssobomax bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } 7475597Ssobomax bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } 7575597Ssobomax bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } 7675597Ssobomax void set(uint var) { _bits = int_to_bit(var); } 7775597Ssobomax void add(uint var) { _bits |= int_to_bit(var); } 7875597Ssobomax void add_unknown() { _bits = UNKNOWN; } 7975597Ssobomax void add_allocated() { _bits = ALLOCATED; } 8075597Ssobomax void set_union(const ArgumentMap &am) { _bits |= am._bits; } 8175597Ssobomax void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } 8275597Ssobomax void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } 8375597Ssobomax void operator=(const ArgumentMap &am) { _bits = am._bits; } 8475597Ssobomax bool operator==(const ArgumentMap &am) { return _bits == am._bits; } 8575597Ssobomax bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } 8675597Ssobomax}; 8775597Ssobomax 8875597Ssobomaxclass BCEscapeAnalyzer::StateInfo { 8975597Ssobomaxpublic: 9075597Ssobomax ArgumentMap *_vars; 9175597Ssobomax ArgumentMap *_stack; 9275597Ssobomax short _stack_height; 9375597Ssobomax short _max_stack; 9475597Ssobomax bool _initialized; 9575597Ssobomax ArgumentMap empty_map; 9675597Ssobomax 9775597Ssobomax StateInfo() { 9875597Ssobomax empty_map.clear(); 9975597Ssobomax } 10075597Ssobomax 10175597Ssobomax ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } 10275597Ssobomax ArgumentMap apop() { return raw_pop(); } 10375597Ssobomax void spop() { raw_pop(); } 10475597Ssobomax void lpop() { spop(); spop(); } 10575597Ssobomax void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } 10675597Ssobomax void apush(ArgumentMap i) { raw_push(i); } 10775597Ssobomax void spush() { raw_push(empty_map); } 10875597Ssobomax void lpush() { spush(); spush(); } 10975597Ssobomax 11075597Ssobomax}; 11175597Ssobomax 11275597Ssobomaxvoid BCEscapeAnalyzer::set_returned(ArgumentMap vars) { 11375597Ssobomax for (int i = 0; i < _arg_size; i++) { 11475597Ssobomax if (vars.contains(i)) 11575597Ssobomax _arg_returned.set(i); 11675597Ssobomax } 11775597Ssobomax _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); 11875597Ssobomax _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); 11975597Ssobomax} 12075597Ssobomax 12175597Ssobomax// return true if any element of vars is an argument 12275597Ssobomaxbool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { 12375597Ssobomax for (int i = 0; i < _arg_size; i++) { 12475597Ssobomax if (vars.contains(i)) 12575597Ssobomax return true; 12675597Ssobomax } 12775597Ssobomax return false; 12875597Ssobomax} 12975597Ssobomax 13075597Ssobomax// return true if any element of vars is an arg_stack argument 13175597Ssobomaxbool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ 13275597Ssobomax if (_conservative) 13375597Ssobomax return true; 13475597Ssobomax for (int i = 0; i < _arg_size; i++) { 13575597Ssobomax if (vars.contains(i) && _arg_stack.test(i)) 13675597Ssobomax return true; 13775597Ssobomax } 13875597Ssobomax return false; 13975597Ssobomax} 14075597Ssobomax 14175597Ssobomax// return true if all argument elements of vars are returned 14275597Ssobomaxbool BCEscapeAnalyzer::returns_all(ArgumentMap vars) { 14375597Ssobomax for (int i = 0; i < _arg_size; i++) { 14475597Ssobomax if (vars.contains(i) && !_arg_returned.test(i)) { 14575597Ssobomax return false; 14675597Ssobomax } 14775597Ssobomax } 14875597Ssobomax return true; 14975597Ssobomax} 15075597Ssobomax 15175597Ssobomaxvoid BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) { 15275597Ssobomax for (int i = 0; i < _arg_size; i++) { 15375597Ssobomax if (vars.contains(i)) { 15475597Ssobomax bm >>= i; 15575597Ssobomax } 15675597Ssobomax } 15775597Ssobomax} 15886366Ssobomax 15986366Ssobomaxvoid BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { 16075597Ssobomax clear_bits(vars, _arg_local); 16175597Ssobomax} 16275597Ssobomax 16375597Ssobomaxvoid BCEscapeAnalyzer::set_global_escape(ArgumentMap vars, bool merge) { 16475597Ssobomax clear_bits(vars, _arg_local); 16575597Ssobomax clear_bits(vars, _arg_stack); 16675597Ssobomax if (vars.contains_allocated()) 16775597Ssobomax _allocated_escapes = true; 16875597Ssobomax 16975597Ssobomax if (merge && !vars.is_empty()) { 17075597Ssobomax // Merge new state into already processed block. 17175597Ssobomax // New state is not taken into account and 17275597Ssobomax // it may invalidate set_returned() result. 17375597Ssobomax if (vars.contains_unknown() || vars.contains_allocated()) { 17475597Ssobomax _return_local = false; 17575597Ssobomax } 17675597Ssobomax if (vars.contains_unknown() || vars.contains_vars()) { 17775597Ssobomax _return_allocated = false; 17875597Ssobomax } 17975597Ssobomax if (_return_local && vars.contains_vars() && !returns_all(vars)) { 18075597Ssobomax // Return result should be invalidated if args in new 18175597Ssobomax // state are not recorded in return state. 18275597Ssobomax _return_local = false; 18375597Ssobomax } 18475597Ssobomax } 18575597Ssobomax} 18675597Ssobomax 18786366Ssobomaxvoid BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { 18875597Ssobomax clear_bits(vars, _dirty); 18986366Ssobomax} 19075597Ssobomax 19175597Ssobomaxvoid BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { 19275597Ssobomax 19375597Ssobomax for (int i = 0; i < _arg_size; i++) { 19475597Ssobomax if (vars.contains(i)) { 19575597Ssobomax set_arg_modified(i, offs, size); 19675597Ssobomax } 19775597Ssobomax } 19875597Ssobomax if (vars.contains_unknown()) 19986366Ssobomax _unknown_modified = true; 20075597Ssobomax} 20175597Ssobomax 20275597Ssobomaxbool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { 20375597Ssobomax for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { 20475597Ssobomax if (scope->method() == callee) { 20575597Ssobomax return true; 20675597Ssobomax } 20775597Ssobomax } 20875597Ssobomax return false; 20975597Ssobomax} 21075597Ssobomax 21175597Ssobomaxbool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { 21275597Ssobomax if (offset == OFFSET_ANY) 21375597Ssobomax return _arg_modified[arg] != 0; 21475597Ssobomax assert(arg >= 0 && arg < _arg_size, "must be an argument."); 21575597Ssobomax bool modified = false; 21675597Ssobomax int l = offset / HeapWordSize; 21775597Ssobomax int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; 21875597Ssobomax if (l > ARG_OFFSET_MAX) 21975597Ssobomax l = ARG_OFFSET_MAX; 22075597Ssobomax if (h > ARG_OFFSET_MAX+1) 22175597Ssobomax h = ARG_OFFSET_MAX + 1; 22275597Ssobomax for (int i = l; i < h; i++) { 22375597Ssobomax modified = modified || (_arg_modified[arg] & (1 << i)) != 0; 22475597Ssobomax } 22575597Ssobomax return modified; 22675597Ssobomax} 22775597Ssobomax 22875597Ssobomaxvoid BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { 22975597Ssobomax if (offset == OFFSET_ANY) { 23075597Ssobomax _arg_modified[arg] = (uint) -1; 23175597Ssobomax return; 23275597Ssobomax } 23375597Ssobomax assert(arg >= 0 && arg < _arg_size, "must be an argument."); 23475597Ssobomax int l = offset / HeapWordSize; 23575597Ssobomax int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; 23675597Ssobomax if (l > ARG_OFFSET_MAX) 23775597Ssobomax l = ARG_OFFSET_MAX; 23875597Ssobomax if (h > ARG_OFFSET_MAX+1) 23975597Ssobomax h = ARG_OFFSET_MAX + 1; 24075597Ssobomax for (int i = l; i < h; i++) { 24175597Ssobomax _arg_modified[arg] |= (1 << i); 24275597Ssobomax } 24375597Ssobomax} 24475597Ssobomax 24575597Ssobomaxvoid BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { 24675597Ssobomax int i; 24775597Ssobomax 24875597Ssobomax // retrieve information about the callee 24975597Ssobomax ciInstanceKlass* klass = target->holder(); 25075597Ssobomax ciInstanceKlass* calling_klass = method()->holder(); 25175597Ssobomax ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); 25275597Ssobomax ciInstanceKlass* actual_recv = callee_holder; 25375597Ssobomax 25475597Ssobomax // Some methods are obviously bindable without any type checks so 255 // convert them directly to an invokespecial or invokestatic. 256 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { 257 switch (code) { 258 case Bytecodes::_invokevirtual: 259 code = Bytecodes::_invokespecial; 260 break; 261 case Bytecodes::_invokehandle: 262 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; 263 break; 264 } 265 } 266 267 // compute size of arguments 268 int arg_size = target->invoke_arg_size(code); 269 int arg_base = MAX2(state._stack_height - arg_size, 0); 270 271 // direct recursive calls are skipped if they can be bound statically without introducing 272 // dependencies and if parameters are passed at the same position as in the current method 273 // other calls are skipped if there are no unescaped arguments passed to them 274 bool directly_recursive = (method() == target) && 275 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); 276 277 // check if analysis of callee can safely be skipped 278 bool skip_callee = true; 279 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { 280 ArgumentMap arg = state._stack[i]; 281 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); 282 } 283 // For now we conservatively skip invokedynamic. 284 if (code == Bytecodes::_invokedynamic) { 285 skip_callee = true; 286 } 287 if (skip_callee) { 288 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); 289 for (i = 0; i < arg_size; i++) { 290 set_method_escape(state.raw_pop()); 291 } 292 _unknown_modified = true; // assume the worst since we don't analyze the called method 293 return; 294 } 295 296 // determine actual method (use CHA if necessary) 297 ciMethod* inline_target = NULL; 298 if (target->is_loaded() && klass->is_loaded() 299 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) 300 && target->is_loaded()) { 301 if (code == Bytecodes::_invokestatic 302 || code == Bytecodes::_invokespecial 303 || code == Bytecodes::_invokevirtual && target->is_final_method()) { 304 inline_target = target; 305 } else { 306 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); 307 } 308 } 309 310 if (inline_target != NULL && !is_recursive_call(inline_target)) { 311 // analyze callee 312 BCEscapeAnalyzer analyzer(inline_target, this); 313 314 // adjust escape state of actual parameters 315 bool must_record_dependencies = false; 316 for (i = arg_size - 1; i >= 0; i--) { 317 ArgumentMap arg = state.raw_pop(); 318 if (!is_argument(arg)) 319 continue; 320 for (int j = 0; j < _arg_size; j++) { 321 if (arg.contains(j)) { 322 _arg_modified[j] |= analyzer._arg_modified[i]; 323 } 324 } 325 if (!is_arg_stack(arg)) { 326 // arguments have already been recognized as escaping 327 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { 328 set_method_escape(arg); 329 must_record_dependencies = true; 330 } else { 331 set_global_escape(arg); 332 } 333 } 334 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); 335 336 // record dependencies if at least one parameter retained stack-allocatable 337 if (must_record_dependencies) { 338 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { 339 _dependencies.append(actual_recv); 340 _dependencies.append(inline_target); 341 } 342 _dependencies.appendAll(analyzer.dependencies()); 343 } 344 } else { 345 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", 346 target->name()->as_utf8())); 347 // conservatively mark all actual parameters as escaping globally 348 for (i = 0; i < arg_size; i++) { 349 ArgumentMap arg = state.raw_pop(); 350 if (!is_argument(arg)) 351 continue; 352 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); 353 set_global_escape(arg); 354 } 355 _unknown_modified = true; // assume the worst since we don't know the called method 356 } 357} 358 359bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { 360 return ((~arg_set1) | arg_set2) == 0; 361} 362 363 364void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { 365 366 blk->set_processed(); 367 ciBytecodeStream s(method()); 368 int limit_bci = blk->limit_bci(); 369 bool fall_through = false; 370 ArgumentMap allocated_obj; 371 allocated_obj.add_allocated(); 372 ArgumentMap unknown_obj; 373 unknown_obj.add_unknown(); 374 ArgumentMap empty_map; 375 376 s.reset_to_bci(blk->start_bci()); 377 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { 378 fall_through = true; 379 switch (s.cur_bc()) { 380 case Bytecodes::_nop: 381 break; 382 case Bytecodes::_aconst_null: 383 state.apush(unknown_obj); 384 break; 385 case Bytecodes::_iconst_m1: 386 case Bytecodes::_iconst_0: 387 case Bytecodes::_iconst_1: 388 case Bytecodes::_iconst_2: 389 case Bytecodes::_iconst_3: 390 case Bytecodes::_iconst_4: 391 case Bytecodes::_iconst_5: 392 case Bytecodes::_fconst_0: 393 case Bytecodes::_fconst_1: 394 case Bytecodes::_fconst_2: 395 case Bytecodes::_bipush: 396 case Bytecodes::_sipush: 397 state.spush(); 398 break; 399 case Bytecodes::_lconst_0: 400 case Bytecodes::_lconst_1: 401 case Bytecodes::_dconst_0: 402 case Bytecodes::_dconst_1: 403 state.lpush(); 404 break; 405 case Bytecodes::_ldc: 406 case Bytecodes::_ldc_w: 407 case Bytecodes::_ldc2_w: 408 { 409 // Avoid calling get_constant() which will try to allocate 410 // unloaded constant. We need only constant's type. 411 int index = s.get_constant_pool_index(); 412 constantTag tag = s.get_constant_pool_tag(index); 413 if (tag.is_long() || tag.is_double()) { 414 // Only longs and doubles use 2 stack slots. 415 state.lpush(); 416 } else if (tag.basic_type() == T_OBJECT) { 417 state.apush(unknown_obj); 418 } else { 419 state.spush(); 420 } 421 break; 422 } 423 case Bytecodes::_aload: 424 state.apush(state._vars[s.get_index()]); 425 break; 426 case Bytecodes::_iload: 427 case Bytecodes::_fload: 428 case Bytecodes::_iload_0: 429 case Bytecodes::_iload_1: 430 case Bytecodes::_iload_2: 431 case Bytecodes::_iload_3: 432 case Bytecodes::_fload_0: 433 case Bytecodes::_fload_1: 434 case Bytecodes::_fload_2: 435 case Bytecodes::_fload_3: 436 state.spush(); 437 break; 438 case Bytecodes::_lload: 439 case Bytecodes::_dload: 440 case Bytecodes::_lload_0: 441 case Bytecodes::_lload_1: 442 case Bytecodes::_lload_2: 443 case Bytecodes::_lload_3: 444 case Bytecodes::_dload_0: 445 case Bytecodes::_dload_1: 446 case Bytecodes::_dload_2: 447 case Bytecodes::_dload_3: 448 state.lpush(); 449 break; 450 case Bytecodes::_aload_0: 451 state.apush(state._vars[0]); 452 break; 453 case Bytecodes::_aload_1: 454 state.apush(state._vars[1]); 455 break; 456 case Bytecodes::_aload_2: 457 state.apush(state._vars[2]); 458 break; 459 case Bytecodes::_aload_3: 460 state.apush(state._vars[3]); 461 break; 462 case Bytecodes::_iaload: 463 case Bytecodes::_faload: 464 case Bytecodes::_baload: 465 case Bytecodes::_caload: 466 case Bytecodes::_saload: 467 state.spop(); 468 set_method_escape(state.apop()); 469 state.spush(); 470 break; 471 case Bytecodes::_laload: 472 case Bytecodes::_daload: 473 state.spop(); 474 set_method_escape(state.apop()); 475 state.lpush(); 476 break; 477 case Bytecodes::_aaload: 478 { state.spop(); 479 ArgumentMap array = state.apop(); 480 set_method_escape(array); 481 state.apush(unknown_obj); 482 set_dirty(array); 483 } 484 break; 485 case Bytecodes::_istore: 486 case Bytecodes::_fstore: 487 case Bytecodes::_istore_0: 488 case Bytecodes::_istore_1: 489 case Bytecodes::_istore_2: 490 case Bytecodes::_istore_3: 491 case Bytecodes::_fstore_0: 492 case Bytecodes::_fstore_1: 493 case Bytecodes::_fstore_2: 494 case Bytecodes::_fstore_3: 495 state.spop(); 496 break; 497 case Bytecodes::_lstore: 498 case Bytecodes::_dstore: 499 case Bytecodes::_lstore_0: 500 case Bytecodes::_lstore_1: 501 case Bytecodes::_lstore_2: 502 case Bytecodes::_lstore_3: 503 case Bytecodes::_dstore_0: 504 case Bytecodes::_dstore_1: 505 case Bytecodes::_dstore_2: 506 case Bytecodes::_dstore_3: 507 state.lpop(); 508 break; 509 case Bytecodes::_astore: 510 state._vars[s.get_index()] = state.apop(); 511 break; 512 case Bytecodes::_astore_0: 513 state._vars[0] = state.apop(); 514 break; 515 case Bytecodes::_astore_1: 516 state._vars[1] = state.apop(); 517 break; 518 case Bytecodes::_astore_2: 519 state._vars[2] = state.apop(); 520 break; 521 case Bytecodes::_astore_3: 522 state._vars[3] = state.apop(); 523 break; 524 case Bytecodes::_iastore: 525 case Bytecodes::_fastore: 526 case Bytecodes::_bastore: 527 case Bytecodes::_castore: 528 case Bytecodes::_sastore: 529 { 530 state.spop(); 531 state.spop(); 532 ArgumentMap arr = state.apop(); 533 set_method_escape(arr); 534 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); 535 break; 536 } 537 case Bytecodes::_lastore: 538 case Bytecodes::_dastore: 539 { 540 state.lpop(); 541 state.spop(); 542 ArgumentMap arr = state.apop(); 543 set_method_escape(arr); 544 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); 545 break; 546 } 547 case Bytecodes::_aastore: 548 { 549 set_global_escape(state.apop()); 550 state.spop(); 551 ArgumentMap arr = state.apop(); 552 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); 553 break; 554 } 555 case Bytecodes::_pop: 556 state.raw_pop(); 557 break; 558 case Bytecodes::_pop2: 559 state.raw_pop(); 560 state.raw_pop(); 561 break; 562 case Bytecodes::_dup: 563 { ArgumentMap w1 = state.raw_pop(); 564 state.raw_push(w1); 565 state.raw_push(w1); 566 } 567 break; 568 case Bytecodes::_dup_x1: 569 { ArgumentMap w1 = state.raw_pop(); 570 ArgumentMap w2 = state.raw_pop(); 571 state.raw_push(w1); 572 state.raw_push(w2); 573 state.raw_push(w1); 574 } 575 break; 576 case Bytecodes::_dup_x2: 577 { ArgumentMap w1 = state.raw_pop(); 578 ArgumentMap w2 = state.raw_pop(); 579 ArgumentMap w3 = state.raw_pop(); 580 state.raw_push(w1); 581 state.raw_push(w3); 582 state.raw_push(w2); 583 state.raw_push(w1); 584 } 585 break; 586 case Bytecodes::_dup2: 587 { ArgumentMap w1 = state.raw_pop(); 588 ArgumentMap w2 = state.raw_pop(); 589 state.raw_push(w2); 590 state.raw_push(w1); 591 state.raw_push(w2); 592 state.raw_push(w1); 593 } 594 break; 595 case Bytecodes::_dup2_x1: 596 { ArgumentMap w1 = state.raw_pop(); 597 ArgumentMap w2 = state.raw_pop(); 598 ArgumentMap w3 = state.raw_pop(); 599 state.raw_push(w2); 600 state.raw_push(w1); 601 state.raw_push(w3); 602 state.raw_push(w2); 603 state.raw_push(w1); 604 } 605 break; 606 case Bytecodes::_dup2_x2: 607 { ArgumentMap w1 = state.raw_pop(); 608 ArgumentMap w2 = state.raw_pop(); 609 ArgumentMap w3 = state.raw_pop(); 610 ArgumentMap w4 = state.raw_pop(); 611 state.raw_push(w2); 612 state.raw_push(w1); 613 state.raw_push(w4); 614 state.raw_push(w3); 615 state.raw_push(w2); 616 state.raw_push(w1); 617 } 618 break; 619 case Bytecodes::_swap: 620 { ArgumentMap w1 = state.raw_pop(); 621 ArgumentMap w2 = state.raw_pop(); 622 state.raw_push(w1); 623 state.raw_push(w2); 624 } 625 break; 626 case Bytecodes::_iadd: 627 case Bytecodes::_fadd: 628 case Bytecodes::_isub: 629 case Bytecodes::_fsub: 630 case Bytecodes::_imul: 631 case Bytecodes::_fmul: 632 case Bytecodes::_idiv: 633 case Bytecodes::_fdiv: 634 case Bytecodes::_irem: 635 case Bytecodes::_frem: 636 case Bytecodes::_iand: 637 case Bytecodes::_ior: 638 case Bytecodes::_ixor: 639 state.spop(); 640 state.spop(); 641 state.spush(); 642 break; 643 case Bytecodes::_ladd: 644 case Bytecodes::_dadd: 645 case Bytecodes::_lsub: 646 case Bytecodes::_dsub: 647 case Bytecodes::_lmul: 648 case Bytecodes::_dmul: 649 case Bytecodes::_ldiv: 650 case Bytecodes::_ddiv: 651 case Bytecodes::_lrem: 652 case Bytecodes::_drem: 653 case Bytecodes::_land: 654 case Bytecodes::_lor: 655 case Bytecodes::_lxor: 656 state.lpop(); 657 state.lpop(); 658 state.lpush(); 659 break; 660 case Bytecodes::_ishl: 661 case Bytecodes::_ishr: 662 case Bytecodes::_iushr: 663 state.spop(); 664 state.spop(); 665 state.spush(); 666 break; 667 case Bytecodes::_lshl: 668 case Bytecodes::_lshr: 669 case Bytecodes::_lushr: 670 state.spop(); 671 state.lpop(); 672 state.lpush(); 673 break; 674 case Bytecodes::_ineg: 675 case Bytecodes::_fneg: 676 state.spop(); 677 state.spush(); 678 break; 679 case Bytecodes::_lneg: 680 case Bytecodes::_dneg: 681 state.lpop(); 682 state.lpush(); 683 break; 684 case Bytecodes::_iinc: 685 break; 686 case Bytecodes::_i2l: 687 case Bytecodes::_i2d: 688 case Bytecodes::_f2l: 689 case Bytecodes::_f2d: 690 state.spop(); 691 state.lpush(); 692 break; 693 case Bytecodes::_i2f: 694 case Bytecodes::_f2i: 695 state.spop(); 696 state.spush(); 697 break; 698 case Bytecodes::_l2i: 699 case Bytecodes::_l2f: 700 case Bytecodes::_d2i: 701 case Bytecodes::_d2f: 702 state.lpop(); 703 state.spush(); 704 break; 705 case Bytecodes::_l2d: 706 case Bytecodes::_d2l: 707 state.lpop(); 708 state.lpush(); 709 break; 710 case Bytecodes::_i2b: 711 case Bytecodes::_i2c: 712 case Bytecodes::_i2s: 713 state.spop(); 714 state.spush(); 715 break; 716 case Bytecodes::_lcmp: 717 case Bytecodes::_dcmpl: 718 case Bytecodes::_dcmpg: 719 state.lpop(); 720 state.lpop(); 721 state.spush(); 722 break; 723 case Bytecodes::_fcmpl: 724 case Bytecodes::_fcmpg: 725 state.spop(); 726 state.spop(); 727 state.spush(); 728 break; 729 case Bytecodes::_ifeq: 730 case Bytecodes::_ifne: 731 case Bytecodes::_iflt: 732 case Bytecodes::_ifge: 733 case Bytecodes::_ifgt: 734 case Bytecodes::_ifle: 735 { 736 state.spop(); 737 int dest_bci = s.get_dest(); 738 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 739 assert(s.next_bci() == limit_bci, "branch must end block"); 740 successors.push(_methodBlocks->block_containing(dest_bci)); 741 break; 742 } 743 case Bytecodes::_if_icmpeq: 744 case Bytecodes::_if_icmpne: 745 case Bytecodes::_if_icmplt: 746 case Bytecodes::_if_icmpge: 747 case Bytecodes::_if_icmpgt: 748 case Bytecodes::_if_icmple: 749 { 750 state.spop(); 751 state.spop(); 752 int dest_bci = s.get_dest(); 753 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 754 assert(s.next_bci() == limit_bci, "branch must end block"); 755 successors.push(_methodBlocks->block_containing(dest_bci)); 756 break; 757 } 758 case Bytecodes::_if_acmpeq: 759 case Bytecodes::_if_acmpne: 760 { 761 set_method_escape(state.apop()); 762 set_method_escape(state.apop()); 763 int dest_bci = s.get_dest(); 764 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 765 assert(s.next_bci() == limit_bci, "branch must end block"); 766 successors.push(_methodBlocks->block_containing(dest_bci)); 767 break; 768 } 769 case Bytecodes::_goto: 770 { 771 int dest_bci = s.get_dest(); 772 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 773 assert(s.next_bci() == limit_bci, "branch must end block"); 774 successors.push(_methodBlocks->block_containing(dest_bci)); 775 fall_through = false; 776 break; 777 } 778 case Bytecodes::_jsr: 779 { 780 int dest_bci = s.get_dest(); 781 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 782 assert(s.next_bci() == limit_bci, "branch must end block"); 783 state.apush(empty_map); 784 successors.push(_methodBlocks->block_containing(dest_bci)); 785 fall_through = false; 786 break; 787 } 788 case Bytecodes::_ret: 789 // we don't track the destination of a "ret" instruction 790 assert(s.next_bci() == limit_bci, "branch must end block"); 791 fall_through = false; 792 break; 793 case Bytecodes::_return: 794 assert(s.next_bci() == limit_bci, "return must end block"); 795 fall_through = false; 796 break; 797 case Bytecodes::_tableswitch: 798 { 799 state.spop(); 800 Bytecode_tableswitch sw(&s); 801 int len = sw.length(); 802 int dest_bci; 803 for (int i = 0; i < len; i++) { 804 dest_bci = s.cur_bci() + sw.dest_offset_at(i); 805 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 806 successors.push(_methodBlocks->block_containing(dest_bci)); 807 } 808 dest_bci = s.cur_bci() + sw.default_offset(); 809 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 810 successors.push(_methodBlocks->block_containing(dest_bci)); 811 assert(s.next_bci() == limit_bci, "branch must end block"); 812 fall_through = false; 813 break; 814 } 815 case Bytecodes::_lookupswitch: 816 { 817 state.spop(); 818 Bytecode_lookupswitch sw(&s); 819 int len = sw.number_of_pairs(); 820 int dest_bci; 821 for (int i = 0; i < len; i++) { 822 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); 823 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 824 successors.push(_methodBlocks->block_containing(dest_bci)); 825 } 826 dest_bci = s.cur_bci() + sw.default_offset(); 827 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 828 successors.push(_methodBlocks->block_containing(dest_bci)); 829 fall_through = false; 830 break; 831 } 832 case Bytecodes::_ireturn: 833 case Bytecodes::_freturn: 834 state.spop(); 835 fall_through = false; 836 break; 837 case Bytecodes::_lreturn: 838 case Bytecodes::_dreturn: 839 state.lpop(); 840 fall_through = false; 841 break; 842 case Bytecodes::_areturn: 843 set_returned(state.apop()); 844 fall_through = false; 845 break; 846 case Bytecodes::_getstatic: 847 case Bytecodes::_getfield: 848 { bool ignored_will_link; 849 ciField* field = s.get_field(ignored_will_link); 850 BasicType field_type = field->type()->basic_type(); 851 if (s.cur_bc() != Bytecodes::_getstatic) { 852 set_method_escape(state.apop()); 853 } 854 if (field_type == T_OBJECT || field_type == T_ARRAY) { 855 state.apush(unknown_obj); 856 } else if (type2size[field_type] == 1) { 857 state.spush(); 858 } else { 859 state.lpush(); 860 } 861 } 862 break; 863 case Bytecodes::_putstatic: 864 case Bytecodes::_putfield: 865 { bool will_link; 866 ciField* field = s.get_field(will_link); 867 BasicType field_type = field->type()->basic_type(); 868 if (field_type == T_OBJECT || field_type == T_ARRAY) { 869 set_global_escape(state.apop()); 870 } else if (type2size[field_type] == 1) { 871 state.spop(); 872 } else { 873 state.lpop(); 874 } 875 if (s.cur_bc() != Bytecodes::_putstatic) { 876 ArgumentMap p = state.apop(); 877 set_method_escape(p); 878 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); 879 } 880 } 881 break; 882 case Bytecodes::_invokevirtual: 883 case Bytecodes::_invokespecial: 884 case Bytecodes::_invokestatic: 885 case Bytecodes::_invokedynamic: 886 case Bytecodes::_invokeinterface: 887 { bool ignored_will_link; 888 ciSignature* declared_signature = NULL; 889 ciMethod* target = s.get_method(ignored_will_link, &declared_signature); 890 ciKlass* holder = s.get_declared_method_holder(); 891 assert(declared_signature != NULL, "cannot be null"); 892 // Push appendix argument, if one. 893 if (s.has_appendix()) { 894 state.apush(unknown_obj); 895 } 896 // Pass in raw bytecode because we need to see invokehandle instructions. 897 invoke(state, s.cur_bc_raw(), target, holder); 898 // We are using the return type of the declared signature here because 899 // it might be a more concrete type than the one from the target (for 900 // e.g. invokedynamic and invokehandle). 901 ciType* return_type = declared_signature->return_type(); 902 if (!return_type->is_primitive_type()) { 903 state.apush(unknown_obj); 904 } else if (return_type->is_one_word()) { 905 state.spush(); 906 } else if (return_type->is_two_word()) { 907 state.lpush(); 908 } 909 } 910 break; 911 case Bytecodes::_new: 912 state.apush(allocated_obj); 913 break; 914 case Bytecodes::_newarray: 915 case Bytecodes::_anewarray: 916 state.spop(); 917 state.apush(allocated_obj); 918 break; 919 case Bytecodes::_multianewarray: 920 { int i = s.cur_bcp()[3]; 921 while (i-- > 0) state.spop(); 922 state.apush(allocated_obj); 923 } 924 break; 925 case Bytecodes::_arraylength: 926 set_method_escape(state.apop()); 927 state.spush(); 928 break; 929 case Bytecodes::_athrow: 930 set_global_escape(state.apop()); 931 fall_through = false; 932 break; 933 case Bytecodes::_checkcast: 934 { ArgumentMap obj = state.apop(); 935 set_method_escape(obj); 936 state.apush(obj); 937 } 938 break; 939 case Bytecodes::_instanceof: 940 set_method_escape(state.apop()); 941 state.spush(); 942 break; 943 case Bytecodes::_monitorenter: 944 case Bytecodes::_monitorexit: 945 state.apop(); 946 break; 947 case Bytecodes::_wide: 948 ShouldNotReachHere(); 949 break; 950 case Bytecodes::_ifnull: 951 case Bytecodes::_ifnonnull: 952 { 953 set_method_escape(state.apop()); 954 int dest_bci = s.get_dest(); 955 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 956 assert(s.next_bci() == limit_bci, "branch must end block"); 957 successors.push(_methodBlocks->block_containing(dest_bci)); 958 break; 959 } 960 case Bytecodes::_goto_w: 961 { 962 int dest_bci = s.get_far_dest(); 963 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 964 assert(s.next_bci() == limit_bci, "branch must end block"); 965 successors.push(_methodBlocks->block_containing(dest_bci)); 966 fall_through = false; 967 break; 968 } 969 case Bytecodes::_jsr_w: 970 { 971 int dest_bci = s.get_far_dest(); 972 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); 973 assert(s.next_bci() == limit_bci, "branch must end block"); 974 state.apush(empty_map); 975 successors.push(_methodBlocks->block_containing(dest_bci)); 976 fall_through = false; 977 break; 978 } 979 case Bytecodes::_breakpoint: 980 break; 981 default: 982 ShouldNotReachHere(); 983 break; 984 } 985 986 } 987 if (fall_through) { 988 int fall_through_bci = s.cur_bci(); 989 if (fall_through_bci < _method->code_size()) { 990 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); 991 successors.push(_methodBlocks->block_containing(fall_through_bci)); 992 } 993 } 994} 995 996void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { 997 StateInfo *d_state = blockstates + dest->index(); 998 int nlocals = _method->max_locals(); 999 1000 // exceptions may cause transfer of control to handlers in the middle of a 1001 // block, so we don't merge the incoming state of exception handlers 1002 if (dest->is_handler()) 1003 return; 1004 if (!d_state->_initialized ) { 1005 // destination not initialized, just copy 1006 for (int i = 0; i < nlocals; i++) { 1007 d_state->_vars[i] = s_state->_vars[i]; 1008 } 1009 for (int i = 0; i < s_state->_stack_height; i++) { 1010 d_state->_stack[i] = s_state->_stack[i]; 1011 } 1012 d_state->_stack_height = s_state->_stack_height; 1013 d_state->_max_stack = s_state->_max_stack; 1014 d_state->_initialized = true; 1015 } else if (!dest->processed()) { 1016 // we have not yet walked the bytecodes of dest, we can merge 1017 // the states 1018 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); 1019 for (int i = 0; i < nlocals; i++) { 1020 d_state->_vars[i].set_union(s_state->_vars[i]); 1021 } 1022 for (int i = 0; i < s_state->_stack_height; i++) { 1023 d_state->_stack[i].set_union(s_state->_stack[i]); 1024 } 1025 } else { 1026 // the bytecodes of dest have already been processed, mark any 1027 // arguments in the source state which are not in the dest state 1028 // as global escape. 1029 // Future refinement: we only need to mark these variable to the 1030 // maximum escape of any variables in dest state 1031 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); 1032 ArgumentMap extra_vars; 1033 for (int i = 0; i < nlocals; i++) { 1034 ArgumentMap t; 1035 t = s_state->_vars[i]; 1036 t.set_difference(d_state->_vars[i]); 1037 extra_vars.set_union(t); 1038 } 1039 for (int i = 0; i < s_state->_stack_height; i++) { 1040 ArgumentMap t; 1041 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; 1042 t.clear(); 1043 t = s_state->_stack[i]; 1044 t.set_difference(d_state->_stack[i]); 1045 extra_vars.set_union(t); 1046 } 1047 set_global_escape(extra_vars, true); 1048 } 1049} 1050 1051void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { 1052 int numblocks = _methodBlocks->num_blocks(); 1053 int stkSize = _method->max_stack(); 1054 int numLocals = _method->max_locals(); 1055 StateInfo state; 1056 1057 int datacount = (numblocks + 1) * (stkSize + numLocals); 1058 int datasize = datacount * sizeof(ArgumentMap); 1059 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); 1060 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); 1061 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); 1062 ArgumentMap *dp = statedata; 1063 state._vars = dp; 1064 dp += numLocals; 1065 state._stack = dp; 1066 dp += stkSize; 1067 state._initialized = false; 1068 state._max_stack = stkSize; 1069 for (int i = 0; i < numblocks; i++) { 1070 blockstates[i]._vars = dp; 1071 dp += numLocals; 1072 blockstates[i]._stack = dp; 1073 dp += stkSize; 1074 blockstates[i]._initialized = false; 1075 blockstates[i]._stack_height = 0; 1076 blockstates[i]._max_stack = stkSize; 1077 } 1078 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); 1079 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); 1080 1081 _methodBlocks->clear_processed(); 1082 1083 // initialize block 0 state from method signature 1084 ArgumentMap allVars; // all oop arguments to method 1085 ciSignature* sig = method()->signature(); 1086 int j = 0; 1087 ciBlock* first_blk = _methodBlocks->block_containing(0); 1088 int fb_i = first_blk->index(); 1089 if (!method()->is_static()) { 1090 // record information for "this" 1091 blockstates[fb_i]._vars[j].set(j); 1092 allVars.add(j); 1093 j++; 1094 } 1095 for (int i = 0; i < sig->count(); i++) { 1096 ciType* t = sig->type_at(i); 1097 if (!t->is_primitive_type()) { 1098 blockstates[fb_i]._vars[j].set(j); 1099 allVars.add(j); 1100 } 1101 j += t->size(); 1102 } 1103 blockstates[fb_i]._initialized = true; 1104 assert(j == _arg_size, "just checking"); 1105 1106 ArgumentMap unknown_map; 1107 unknown_map.add_unknown(); 1108 1109 worklist.push(first_blk); 1110 while(worklist.length() > 0) { 1111 ciBlock *blk = worklist.pop(); 1112 StateInfo *blkState = blockstates + blk->index(); 1113 if (blk->is_handler() || blk->is_ret_target()) { 1114 // for an exception handler or a target of a ret instruction, we assume the worst case, 1115 // that any variable could contain any argument 1116 for (int i = 0; i < numLocals; i++) { 1117 state._vars[i] = allVars; 1118 } 1119 if (blk->is_handler()) { 1120 state._stack_height = 1; 1121 } else { 1122 state._stack_height = blkState->_stack_height; 1123 } 1124 for (int i = 0; i < state._stack_height; i++) { 1125// ??? should this be unknown_map ??? 1126 state._stack[i] = allVars; 1127 } 1128 } else { 1129 for (int i = 0; i < numLocals; i++) { 1130 state._vars[i] = blkState->_vars[i]; 1131 } 1132 for (int i = 0; i < blkState->_stack_height; i++) { 1133 state._stack[i] = blkState->_stack[i]; 1134 } 1135 state._stack_height = blkState->_stack_height; 1136 } 1137 iterate_one_block(blk, state, successors); 1138 // if this block has any exception handlers, push them 1139 // onto successor list 1140 if (blk->has_handler()) { 1141 DEBUG_ONLY(int handler_count = 0;) 1142 int blk_start = blk->start_bci(); 1143 int blk_end = blk->limit_bci(); 1144 for (int i = 0; i < numblocks; i++) { 1145 ciBlock *b = _methodBlocks->block(i); 1146 if (b->is_handler()) { 1147 int ex_start = b->ex_start_bci(); 1148 int ex_end = b->ex_limit_bci(); 1149 if ((ex_start >= blk_start && ex_start < blk_end) || 1150 (ex_end > blk_start && ex_end <= blk_end)) { 1151 successors.push(b); 1152 } 1153 DEBUG_ONLY(handler_count++;) 1154 } 1155 } 1156 assert(handler_count > 0, "must find at least one handler"); 1157 } 1158 // merge computed variable state with successors 1159 while(successors.length() > 0) { 1160 ciBlock *succ = successors.pop(); 1161 merge_block_states(blockstates, succ, &state); 1162 if (!succ->processed()) 1163 worklist.push(succ); 1164 } 1165 } 1166} 1167 1168bool BCEscapeAnalyzer::do_analysis() { 1169 Arena* arena = CURRENT_ENV->arena(); 1170 // identify basic blocks 1171 _methodBlocks = _method->get_method_blocks(); 1172 1173 iterate_blocks(arena); 1174 // TEMPORARY 1175 return true; 1176} 1177 1178vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { 1179 vmIntrinsics::ID iid = method()->intrinsic_id(); 1180 1181 if (iid == vmIntrinsics::_getClass || 1182 iid == vmIntrinsics::_fillInStackTrace || 1183 iid == vmIntrinsics::_hashCode) 1184 return iid; 1185 else 1186 return vmIntrinsics::_none; 1187} 1188 1189bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { 1190 ArgumentMap arg; 1191 arg.clear(); 1192 switch (iid) { 1193 case vmIntrinsics::_getClass: 1194 _return_local = false; 1195 break; 1196 case vmIntrinsics::_fillInStackTrace: 1197 arg.set(0); // 'this' 1198 set_returned(arg); 1199 break; 1200 case vmIntrinsics::_hashCode: 1201 // initialized state is correct 1202 break; 1203 default: 1204 assert(false, "unexpected intrinsic"); 1205 } 1206 return true; 1207} 1208 1209void BCEscapeAnalyzer::initialize() { 1210 int i; 1211 1212 // clear escape information (method may have been deoptimized) 1213 methodData()->clear_escape_info(); 1214 1215 // initialize escape state of object parameters 1216 ciSignature* sig = method()->signature(); 1217 int j = 0; 1218 if (!method()->is_static()) { 1219 _arg_local.set(0); 1220 _arg_stack.set(0); 1221 j++; 1222 } 1223 for (i = 0; i < sig->count(); i++) { 1224 ciType* t = sig->type_at(i); 1225 if (!t->is_primitive_type()) { 1226 _arg_local.set(j); 1227 _arg_stack.set(j); 1228 } 1229 j += t->size(); 1230 } 1231 assert(j == _arg_size, "just checking"); 1232 1233 // start with optimistic assumption 1234 ciType *rt = _method->return_type(); 1235 if (rt->is_primitive_type()) { 1236 _return_local = false; 1237 _return_allocated = false; 1238 } else { 1239 _return_local = true; 1240 _return_allocated = true; 1241 } 1242 _allocated_escapes = false; 1243 _unknown_modified = false; 1244} 1245 1246void BCEscapeAnalyzer::clear_escape_info() { 1247 ciSignature* sig = method()->signature(); 1248 int arg_count = sig->count(); 1249 ArgumentMap var; 1250 if (!method()->is_static()) { 1251 arg_count++; // allow for "this" 1252 } 1253 for (int i = 0; i < arg_count; i++) { 1254 set_arg_modified(i, OFFSET_ANY, 4); 1255 var.clear(); 1256 var.set(i); 1257 set_modified(var, OFFSET_ANY, 4); 1258 set_global_escape(var); 1259 } 1260 _arg_local.Clear(); 1261 _arg_stack.Clear(); 1262 _arg_returned.Clear(); 1263 _return_local = false; 1264 _return_allocated = false; 1265 _allocated_escapes = true; 1266 _unknown_modified = true; 1267} 1268 1269 1270void BCEscapeAnalyzer::compute_escape_info() { 1271 int i; 1272 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); 1273 1274 vmIntrinsics::ID iid = known_intrinsic(); 1275 1276 // check if method can be analyzed 1277 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() 1278 || _level > MaxBCEAEstimateLevel 1279 || method()->code_size() > MaxBCEAEstimateSize)) { 1280 if (BCEATraceLevel >= 1) { 1281 tty->print("Skipping method because: "); 1282 if (method()->is_abstract()) 1283 tty->print_cr("method is abstract."); 1284 else if (method()->is_native()) 1285 tty->print_cr("method is native."); 1286 else if (!method()->holder()->is_initialized()) 1287 tty->print_cr("class of method is not initialized."); 1288 else if (_level > MaxBCEAEstimateLevel) 1289 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", 1290 _level, MaxBCEAEstimateLevel); 1291 else if (method()->code_size() > MaxBCEAEstimateSize) 1292 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", 1293 method()->code_size(), MaxBCEAEstimateSize); 1294 else 1295 ShouldNotReachHere(); 1296 } 1297 clear_escape_info(); 1298 1299 return; 1300 } 1301 1302 if (BCEATraceLevel >= 1) { 1303 tty->print("[EA] estimating escape information for"); 1304 if (iid != vmIntrinsics::_none) 1305 tty->print(" intrinsic"); 1306 method()->print_short_name(); 1307 tty->print_cr(" (%d bytes)", method()->code_size()); 1308 } 1309 1310 bool success; 1311 1312 initialize(); 1313 1314 // Do not scan method if it has no object parameters and 1315 // does not returns an object (_return_allocated is set in initialize()). 1316 if (_arg_local.Size() == 0 && !_return_allocated) { 1317 // Clear all info since method's bytecode was not analysed and 1318 // set pessimistic escape information. 1319 clear_escape_info(); 1320 methodData()->set_eflag(MethodData::allocated_escapes); 1321 methodData()->set_eflag(MethodData::unknown_modified); 1322 methodData()->set_eflag(MethodData::estimated); 1323 return; 1324 } 1325 1326 if (iid != vmIntrinsics::_none) 1327 success = compute_escape_for_intrinsic(iid); 1328 else { 1329 success = do_analysis(); 1330 } 1331 1332 // don't store interprocedural escape information if it introduces 1333 // dependencies or if method data is empty 1334 // 1335 if (!has_dependencies() && !methodData()->is_empty()) { 1336 for (i = 0; i < _arg_size; i++) { 1337 if (_arg_local.test(i)) { 1338 assert(_arg_stack.test(i), "inconsistent escape info"); 1339 methodData()->set_arg_local(i); 1340 methodData()->set_arg_stack(i); 1341 } else if (_arg_stack.test(i)) { 1342 methodData()->set_arg_stack(i); 1343 } 1344 if (_arg_returned.test(i)) { 1345 methodData()->set_arg_returned(i); 1346 } 1347 methodData()->set_arg_modified(i, _arg_modified[i]); 1348 } 1349 if (_return_local) { 1350 methodData()->set_eflag(MethodData::return_local); 1351 } 1352 if (_return_allocated) { 1353 methodData()->set_eflag(MethodData::return_allocated); 1354 } 1355 if (_allocated_escapes) { 1356 methodData()->set_eflag(MethodData::allocated_escapes); 1357 } 1358 if (_unknown_modified) { 1359 methodData()->set_eflag(MethodData::unknown_modified); 1360 } 1361 methodData()->set_eflag(MethodData::estimated); 1362 } 1363} 1364 1365void BCEscapeAnalyzer::read_escape_info() { 1366 assert(methodData()->has_escape_info(), "no escape info available"); 1367 1368 // read escape information from method descriptor 1369 for (int i = 0; i < _arg_size; i++) { 1370 if (methodData()->is_arg_local(i)) 1371 _arg_local.set(i); 1372 if (methodData()->is_arg_stack(i)) 1373 _arg_stack.set(i); 1374 if (methodData()->is_arg_returned(i)) 1375 _arg_returned.set(i); 1376 _arg_modified[i] = methodData()->arg_modified(i); 1377 } 1378 _return_local = methodData()->eflag_set(MethodData::return_local); 1379 _return_allocated = methodData()->eflag_set(MethodData::return_allocated); 1380 _allocated_escapes = methodData()->eflag_set(MethodData::allocated_escapes); 1381 _unknown_modified = methodData()->eflag_set(MethodData::unknown_modified); 1382 1383} 1384 1385#ifndef PRODUCT 1386void BCEscapeAnalyzer::dump() { 1387 tty->print("[EA] estimated escape information for"); 1388 method()->print_short_name(); 1389 tty->print_cr(has_dependencies() ? " (not stored)" : ""); 1390 tty->print(" non-escaping args: "); 1391 _arg_local.print_on(tty); 1392 tty->print(" stack-allocatable args: "); 1393 _arg_stack.print_on(tty); 1394 if (_return_local) { 1395 tty->print(" returned args: "); 1396 _arg_returned.print_on(tty); 1397 } else if (is_return_allocated()) { 1398 tty->print_cr(" return allocated value"); 1399 } else { 1400 tty->print_cr(" return non-local value"); 1401 } 1402 tty->print(" modified args: "); 1403 for (int i = 0; i < _arg_size; i++) { 1404 if (_arg_modified[i] == 0) 1405 tty->print(" 0"); 1406 else 1407 tty->print(" 0x%x", _arg_modified[i]); 1408 } 1409 tty->cr(); 1410 tty->print(" flags: "); 1411 if (_return_allocated) 1412 tty->print(" return_allocated"); 1413 if (_allocated_escapes) 1414 tty->print(" allocated_escapes"); 1415 if (_unknown_modified) 1416 tty->print(" unknown_modified"); 1417 tty->cr(); 1418} 1419#endif 1420 1421BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) 1422 : _conservative(method == NULL || !EstimateArgEscape) 1423 , _arena(CURRENT_ENV->arena()) 1424 , _method(method) 1425 , _methodData(method ? method->method_data() : NULL) 1426 , _arg_size(method ? method->arg_size() : 0) 1427 , _arg_local(_arena) 1428 , _arg_stack(_arena) 1429 , _arg_returned(_arena) 1430 , _dirty(_arena) 1431 , _return_local(false) 1432 , _return_allocated(false) 1433 , _allocated_escapes(false) 1434 , _unknown_modified(false) 1435 , _dependencies(_arena, 4, 0, NULL) 1436 , _parent(parent) 1437 , _level(parent == NULL ? 0 : parent->level() + 1) { 1438 if (!_conservative) { 1439 _arg_local.Clear(); 1440 _arg_stack.Clear(); 1441 _arg_returned.Clear(); 1442 _dirty.Clear(); 1443 Arena* arena = CURRENT_ENV->arena(); 1444 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); 1445 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); 1446 1447 if (methodData() == NULL) 1448 return; 1449 bool printit = _method->should_print_assembly(); 1450 if (methodData()->has_escape_info()) { 1451 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", 1452 method->holder()->name()->as_utf8(), 1453 method->name()->as_utf8())); 1454 read_escape_info(); 1455 } else { 1456 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", 1457 method->holder()->name()->as_utf8(), 1458 method->name()->as_utf8())); 1459 1460 compute_escape_info(); 1461 methodData()->update_escape_info(); 1462 } 1463#ifndef PRODUCT 1464 if (BCEATraceLevel >= 3) { 1465 // dump escape information 1466 dump(); 1467 } 1468#endif 1469 } 1470} 1471 1472void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { 1473 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { 1474 // Also record evol dependencies so redefinition of the 1475 // callee will trigger recompilation. 1476 deps->assert_evol_method(method()); 1477 } 1478 for (int i = 0; i < _dependencies.length(); i+=2) { 1479 ciKlass *k = _dependencies.at(i)->as_klass(); 1480 ciMethod *m = _dependencies.at(i+1)->as_method(); 1481 deps->assert_unique_concrete_method(k, m); 1482 } 1483} 1484