1 /*
2 * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25
26 #include "incls/_precompiled.incl"
27 #include "incls/_bcEscapeAnalyzer.cpp.incl"
28
29
30 #ifndef PRODUCT
31 #define TRACE_BCEA(level, code) \
32 if (EstimateArgEscape && BCEATraceLevel >= level) { \
33 code; \
34 }
35 #else
36 #define TRACE_BCEA(level, code)
37 #endif
38
39 // Maintain a map of which aguments a local variable or
40 // stack slot may contain. In addition to tracking
41 // arguments, it tracks two special values, "allocated"
42 // which represents any object allocated in the current
43 // method, and "unknown" which is any other object.
44 // Up to 30 arguments are handled, with the last one
45 // representing summary information for any extra arguments
46 class BCEscapeAnalyzer::ArgumentMap {
47 uint _bits;
48 enum {MAXBIT = 29,
49 ALLOCATED = 1,
50 UNKNOWN = 2};
51
52 uint int_to_bit(uint e) const {
53 if (e > MAXBIT)
54 e = MAXBIT;
55 return (1 << (e + 2));
56 }
57
58 public:
59 ArgumentMap() { _bits = 0;}
60 void set_bits(uint bits) { _bits = bits;}
61 uint get_bits() const { return _bits;}
62 void clear() { _bits = 0;}
63 void set_all() { _bits = ~0u; }
64 bool is_empty() const { return _bits == 0; }
65 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; }
66 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); }
67 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; }
68 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; }
69 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; }
70 void set(uint var) { _bits = int_to_bit(var); }
71 void add(uint var) { _bits |= int_to_bit(var); }
72 void add_unknown() { _bits = UNKNOWN; }
73 void add_allocated() { _bits = ALLOCATED; }
74 void set_union(const ArgumentMap &am) { _bits |= am._bits; }
75 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; }
76 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; }
77 void operator=(const ArgumentMap &am) { _bits = am._bits; }
78 bool operator==(const ArgumentMap &am) { return _bits == am._bits; }
79 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; }
80 };
81
82 class BCEscapeAnalyzer::StateInfo {
83 public:
84 ArgumentMap *_vars;
85 ArgumentMap *_stack;
86 short _stack_height;
87 short _max_stack;
88 bool _initialized;
89 ArgumentMap empty_map;
90
91 StateInfo() {
92 empty_map.clear();
93 }
94
95 ArgumentMap raw_pop() { assert(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; }
96 ArgumentMap apop() { return raw_pop(); }
97 void spop() { raw_pop(); }
98 void lpop() { spop(); spop(); }
99 void raw_push(ArgumentMap i) { assert(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; }
100 void apush(ArgumentMap i) { raw_push(i); }
101 void spush() { raw_push(empty_map); }
102 void lpush() { spush(); spush(); }
103
104 };
105
106 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) {
107 for (int i = 0; i < _arg_size; i++) {
108 if (vars.contains(i))
109 _arg_returned.set_bit(i);
110 }
111 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated());
112 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars());
113 }
114
115 // return true if any element of vars is an argument
116 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) {
117 for (int i = 0; i < _arg_size; i++) {
118 if (vars.contains(i))
119 return true;
120 }
121 return false;
122 }
123
124 // return true if any element of vars is an arg_stack argument
125 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){
126 if (_conservative)
127 return true;
128 for (int i = 0; i < _arg_size; i++) {
129 if (vars.contains(i) && _arg_stack.at(i))
130 return true;
131 }
132 return false;
133 }
134
135 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, BitMap &bm) {
136 for (int i = 0; i < _arg_size; i++) {
137 if (vars.contains(i)) {
138 bm.clear_bit(i);
139 }
140 }
141 }
142
143 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) {
144 clear_bits(vars, _arg_local);
145 }
146
147 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars) {
148 clear_bits(vars, _arg_local);
149 clear_bits(vars, _arg_stack);
150 if (vars.contains_allocated())
151 _allocated_escapes = true;
152 }
153
154 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) {
155 clear_bits(vars, _dirty);
156 }
157
158 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) {
159
160 for (int i = 0; i < _arg_size; i++) {
161 if (vars.contains(i)) {
162 set_arg_modified(i, offs, size);
163 }
164 }
165 if (vars.contains_unknown())
166 _unknown_modified = true;
167 }
168
169 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) {
170 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) {
171 if (scope->method() == callee) {
172 return true;
173 }
174 }
175 return false;
176 }
177
178 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) {
179 if (offset == OFFSET_ANY)
180 return _arg_modified[arg] != 0;
181 assert(arg >= 0 && arg < _arg_size, "must be an argument.");
182 bool modified = false;
183 int l = offset / HeapWordSize;
184 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize;
185 if (l > ARG_OFFSET_MAX)
186 l = ARG_OFFSET_MAX;
187 if (h > ARG_OFFSET_MAX+1)
188 h = ARG_OFFSET_MAX + 1;
189 for (int i = l; i < h; i++) {
190 modified = modified || (_arg_modified[arg] & (1 << i)) != 0;
191 }
192 return modified;
193 }
194
195 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) {
196 if (offset == OFFSET_ANY) {
197 _arg_modified[arg] = (uint) -1;
198 return;
199 }
200 assert(arg >= 0 && arg < _arg_size, "must be an argument.");
201 int l = offset / HeapWordSize;
202 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize;
203 if (l > ARG_OFFSET_MAX)
204 l = ARG_OFFSET_MAX;
205 if (h > ARG_OFFSET_MAX+1)
206 h = ARG_OFFSET_MAX + 1;
207 for (int i = l; i < h; i++) {
208 _arg_modified[arg] |= (1 << i);
209 }
210 }
211
212 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) {
213 int i;
214
215 // retrieve information about the callee
216 ciInstanceKlass* klass = target->holder();
217 ciInstanceKlass* calling_klass = method()->holder();
218 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
219 ciInstanceKlass* actual_recv = callee_holder;
220
221 // some methods are obviously bindable without any type checks so
222 // convert them directly to an invokespecial.
223 if (target->is_loaded() && !target->is_abstract() &&
224 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) {
225 code = Bytecodes::_invokespecial;
226 }
227
228 // compute size of arguments
229 int arg_size = target->arg_size();
230 if (!target->is_loaded() && code == Bytecodes::_invokestatic) {
231 arg_size--;
232 }
233 int arg_base = MAX2(state._stack_height - arg_size, 0);
234
235 // direct recursive calls are skipped if they can be bound statically without introducing
236 // dependencies and if parameters are passed at the same position as in the current method
237 // other calls are skipped if there are no unescaped arguments passed to them
238 bool directly_recursive = (method() == target) &&
239 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty());
240
241 // check if analysis of callee can safely be skipped
242 bool skip_callee = true;
243 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) {
244 ArgumentMap arg = state._stack[i];
245 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base));
246 }
247 if (skip_callee) {
248 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8()));
249 for (i = 0; i < arg_size; i++) {
250 set_method_escape(state.raw_pop());
251 }
252 _unknown_modified = true; // assume the worst since we don't analyze the called method
253 return;
254 }
255
256 // determine actual method (use CHA if necessary)
257 ciMethod* inline_target = NULL;
258 if (target->is_loaded() && klass->is_loaded()
259 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
260 && target->will_link(klass, callee_holder, code)) {
261 if (code == Bytecodes::_invokestatic
262 || code == Bytecodes::_invokespecial
263 || code == Bytecodes::_invokevirtual && target->is_final_method()) {
264 inline_target = target;
265 } else {
266 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
267 }
268 }
269
270 if (inline_target != NULL && !is_recursive_call(inline_target)) {
271 // analyze callee
272 BCEscapeAnalyzer analyzer(inline_target, this);
273
274 // adjust escape state of actual parameters
275 bool must_record_dependencies = false;
276 for (i = arg_size - 1; i >= 0; i--) {
277 ArgumentMap arg = state.raw_pop();
278 if (!is_argument(arg))
279 continue;
280 for (int j = 0; j < _arg_size; j++) {
281 if (arg.contains(j)) {
282 _arg_modified[j] |= analyzer._arg_modified[i];
283 }
284 }
285 if (!is_arg_stack(arg)) {
286 // arguments have already been recognized as escaping
287 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) {
288 set_method_escape(arg);
289 must_record_dependencies = true;
290 } else {
291 set_global_escape(arg);
292 }
293 }
294 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects();
295
296 // record dependencies if at least one parameter retained stack-allocatable
297 if (must_record_dependencies) {
298 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) {
299 _dependencies.append(actual_recv);
300 _dependencies.append(inline_target);
301 }
302 _dependencies.appendAll(analyzer.dependencies());
303 }
304 } else {
305 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.",
306 target->name()->as_utf8()));
307 // conservatively mark all actual parameters as escaping globally
308 for (i = 0; i < arg_size; i++) {
309 ArgumentMap arg = state.raw_pop();
310 if (!is_argument(arg))
311 continue;
312 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
313 set_global_escape(arg);
314 }
315 _unknown_modified = true; // assume the worst since we don't know the called method
316 }
317 }
318
319 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) {
320 return ((~arg_set1) | arg_set2) == 0;
321 }
322
323
324 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) {
325
326 blk->set_processed();
327 ciBytecodeStream s(method());
328 int limit_bci = blk->limit_bci();
329 bool fall_through = false;
330 ArgumentMap allocated_obj;
331 allocated_obj.add_allocated();
332 ArgumentMap unknown_obj;
333 unknown_obj.add_unknown();
334 ArgumentMap empty_map;
335
336 s.reset_to_bci(blk->start_bci());
337 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) {
338 fall_through = true;
339 switch (s.cur_bc()) {
340 case Bytecodes::_nop:
341 break;
342 case Bytecodes::_aconst_null:
343 state.apush(empty_map);
344 break;
345 case Bytecodes::_iconst_m1:
346 case Bytecodes::_iconst_0:
347 case Bytecodes::_iconst_1:
348 case Bytecodes::_iconst_2:
349 case Bytecodes::_iconst_3:
350 case Bytecodes::_iconst_4:
351 case Bytecodes::_iconst_5:
352 case Bytecodes::_fconst_0:
353 case Bytecodes::_fconst_1:
354 case Bytecodes::_fconst_2:
355 case Bytecodes::_bipush:
356 case Bytecodes::_sipush:
357 state.spush();
358 break;
359 case Bytecodes::_lconst_0:
360 case Bytecodes::_lconst_1:
361 case Bytecodes::_dconst_0:
362 case Bytecodes::_dconst_1:
363 state.lpush();
364 break;
365 case Bytecodes::_ldc:
366 case Bytecodes::_ldc_w:
367 case Bytecodes::_ldc2_w:
368 if (type2size[s.get_constant().basic_type()] == 1) {
369 state.spush();
370 } else {
371 state.lpush();
372 }
373 break;
374 case Bytecodes::_aload:
375 state.apush(state._vars[s.get_index()]);
376 break;
377 case Bytecodes::_iload:
378 case Bytecodes::_fload:
379 case Bytecodes::_iload_0:
380 case Bytecodes::_iload_1:
381 case Bytecodes::_iload_2:
382 case Bytecodes::_iload_3:
383 case Bytecodes::_fload_0:
384 case Bytecodes::_fload_1:
385 case Bytecodes::_fload_2:
386 case Bytecodes::_fload_3:
387 state.spush();
388 break;
389 case Bytecodes::_lload:
390 case Bytecodes::_dload:
391 case Bytecodes::_lload_0:
392 case Bytecodes::_lload_1:
393 case Bytecodes::_lload_2:
394 case Bytecodes::_lload_3:
395 case Bytecodes::_dload_0:
396 case Bytecodes::_dload_1:
397 case Bytecodes::_dload_2:
398 case Bytecodes::_dload_3:
399 state.lpush();
400 break;
401 case Bytecodes::_aload_0:
402 state.apush(state._vars[0]);
403 break;
404 case Bytecodes::_aload_1:
405 state.apush(state._vars[1]);
406 break;
407 case Bytecodes::_aload_2:
408 state.apush(state._vars[2]);
409 break;
410 case Bytecodes::_aload_3:
411 state.apush(state._vars[3]);
412 break;
413 case Bytecodes::_iaload:
414 case Bytecodes::_faload:
415 case Bytecodes::_baload:
416 case Bytecodes::_caload:
417 case Bytecodes::_saload:
418 state.spop();
419 set_method_escape(state.apop());
420 state.spush();
421 break;
422 case Bytecodes::_laload:
423 case Bytecodes::_daload:
424 state.spop();
425 set_method_escape(state.apop());
426 state.lpush();
427 break;
428 case Bytecodes::_aaload:
429 { state.spop();
430 ArgumentMap array = state.apop();
431 set_method_escape(array);
432 state.apush(unknown_obj);
433 set_dirty(array);
434 }
435 break;
436 case Bytecodes::_istore:
437 case Bytecodes::_fstore:
438 case Bytecodes::_istore_0:
439 case Bytecodes::_istore_1:
440 case Bytecodes::_istore_2:
441 case Bytecodes::_istore_3:
442 case Bytecodes::_fstore_0:
443 case Bytecodes::_fstore_1:
444 case Bytecodes::_fstore_2:
445 case Bytecodes::_fstore_3:
446 state.spop();
447 break;
448 case Bytecodes::_lstore:
449 case Bytecodes::_dstore:
450 case Bytecodes::_lstore_0:
451 case Bytecodes::_lstore_1:
452 case Bytecodes::_lstore_2:
453 case Bytecodes::_lstore_3:
454 case Bytecodes::_dstore_0:
455 case Bytecodes::_dstore_1:
456 case Bytecodes::_dstore_2:
457 case Bytecodes::_dstore_3:
458 state.lpop();
459 break;
460 case Bytecodes::_astore:
461 state._vars[s.get_index()] = state.apop();
462 break;
463 case Bytecodes::_astore_0:
464 state._vars[0] = state.apop();
465 break;
466 case Bytecodes::_astore_1:
467 state._vars[1] = state.apop();
468 break;
469 case Bytecodes::_astore_2:
470 state._vars[2] = state.apop();
471 break;
472 case Bytecodes::_astore_3:
473 state._vars[3] = state.apop();
474 break;
475 case Bytecodes::_iastore:
476 case Bytecodes::_fastore:
477 case Bytecodes::_bastore:
478 case Bytecodes::_castore:
479 case Bytecodes::_sastore:
480 {
481 state.spop();
482 state.spop();
483 ArgumentMap arr = state.apop();
484 set_method_escape(arr);
485 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
486 break;
487 }
488 case Bytecodes::_lastore:
489 case Bytecodes::_dastore:
490 {
491 state.lpop();
492 state.spop();
493 ArgumentMap arr = state.apop();
494 set_method_escape(arr);
495 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize);
496 break;
497 }
498 case Bytecodes::_aastore:
499 {
500 set_global_escape(state.apop());
501 state.spop();
502 ArgumentMap arr = state.apop();
503 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize);
504 break;
505 }
506 case Bytecodes::_pop:
507 state.raw_pop();
508 break;
509 case Bytecodes::_pop2:
510 state.raw_pop();
511 state.raw_pop();
512 break;
513 case Bytecodes::_dup:
514 { ArgumentMap w1 = state.raw_pop();
515 state.raw_push(w1);
516 state.raw_push(w1);
517 }
518 break;
519 case Bytecodes::_dup_x1:
520 { ArgumentMap w1 = state.raw_pop();
521 ArgumentMap w2 = state.raw_pop();
522 state.raw_push(w1);
523 state.raw_push(w2);
524 state.raw_push(w1);
525 }
526 break;
527 case Bytecodes::_dup_x2:
528 { ArgumentMap w1 = state.raw_pop();
529 ArgumentMap w2 = state.raw_pop();
530 ArgumentMap w3 = state.raw_pop();
531 state.raw_push(w1);
532 state.raw_push(w3);
533 state.raw_push(w2);
534 state.raw_push(w1);
535 }
536 break;
537 case Bytecodes::_dup2:
538 { ArgumentMap w1 = state.raw_pop();
539 ArgumentMap w2 = state.raw_pop();
540 state.raw_push(w2);
541 state.raw_push(w1);
542 state.raw_push(w2);
543 state.raw_push(w1);
544 }
545 break;
546 case Bytecodes::_dup2_x1:
547 { ArgumentMap w1 = state.raw_pop();
548 ArgumentMap w2 = state.raw_pop();
549 ArgumentMap w3 = state.raw_pop();
550 state.raw_push(w2);
551 state.raw_push(w1);
552 state.raw_push(w3);
553 state.raw_push(w2);
554 state.raw_push(w1);
555 }
556 break;
557 case Bytecodes::_dup2_x2:
558 { ArgumentMap w1 = state.raw_pop();
559 ArgumentMap w2 = state.raw_pop();
560 ArgumentMap w3 = state.raw_pop();
561 ArgumentMap w4 = state.raw_pop();
562 state.raw_push(w2);
563 state.raw_push(w1);
564 state.raw_push(w4);
565 state.raw_push(w3);
566 state.raw_push(w2);
567 state.raw_push(w1);
568 }
569 break;
570 case Bytecodes::_swap:
571 { ArgumentMap w1 = state.raw_pop();
572 ArgumentMap w2 = state.raw_pop();
573 state.raw_push(w1);
574 state.raw_push(w2);
575 }
576 break;
577 case Bytecodes::_iadd:
578 case Bytecodes::_fadd:
579 case Bytecodes::_isub:
580 case Bytecodes::_fsub:
581 case Bytecodes::_imul:
582 case Bytecodes::_fmul:
583 case Bytecodes::_idiv:
584 case Bytecodes::_fdiv:
585 case Bytecodes::_irem:
586 case Bytecodes::_frem:
587 case Bytecodes::_iand:
588 case Bytecodes::_ior:
589 case Bytecodes::_ixor:
590 state.spop();
591 state.spop();
592 state.spush();
593 break;
594 case Bytecodes::_ladd:
595 case Bytecodes::_dadd:
596 case Bytecodes::_lsub:
597 case Bytecodes::_dsub:
598 case Bytecodes::_lmul:
599 case Bytecodes::_dmul:
600 case Bytecodes::_ldiv:
601 case Bytecodes::_ddiv:
602 case Bytecodes::_lrem:
603 case Bytecodes::_drem:
604 case Bytecodes::_land:
605 case Bytecodes::_lor:
606 case Bytecodes::_lxor:
607 state.lpop();
608 state.lpop();
609 state.lpush();
610 break;
611 case Bytecodes::_ishl:
612 case Bytecodes::_ishr:
613 case Bytecodes::_iushr:
614 state.spop();
615 state.spop();
616 state.spush();
617 break;
618 case Bytecodes::_lshl:
619 case Bytecodes::_lshr:
620 case Bytecodes::_lushr:
621 state.spop();
622 state.lpop();
623 state.lpush();
624 break;
625 case Bytecodes::_ineg:
626 case Bytecodes::_fneg:
627 state.spop();
628 state.spush();
629 break;
630 case Bytecodes::_lneg:
631 case Bytecodes::_dneg:
632 state.lpop();
633 state.lpush();
634 break;
635 case Bytecodes::_iinc:
636 break;
637 case Bytecodes::_i2l:
638 case Bytecodes::_i2d:
639 case Bytecodes::_f2l:
640 case Bytecodes::_f2d:
641 state.spop();
642 state.lpush();
643 break;
644 case Bytecodes::_i2f:
645 case Bytecodes::_f2i:
646 state.spop();
647 state.spush();
648 break;
649 case Bytecodes::_l2i:
650 case Bytecodes::_l2f:
651 case Bytecodes::_d2i:
652 case Bytecodes::_d2f:
653 state.lpop();
654 state.spush();
655 break;
656 case Bytecodes::_l2d:
657 case Bytecodes::_d2l:
658 state.lpop();
659 state.lpush();
660 break;
661 case Bytecodes::_i2b:
662 case Bytecodes::_i2c:
663 case Bytecodes::_i2s:
664 state.spop();
665 state.spush();
666 break;
667 case Bytecodes::_lcmp:
668 case Bytecodes::_dcmpl:
669 case Bytecodes::_dcmpg:
670 state.lpop();
671 state.lpop();
672 state.spush();
673 break;
674 case Bytecodes::_fcmpl:
675 case Bytecodes::_fcmpg:
676 state.spop();
677 state.spop();
678 state.spush();
679 break;
680 case Bytecodes::_ifeq:
681 case Bytecodes::_ifne:
682 case Bytecodes::_iflt:
683 case Bytecodes::_ifge:
684 case Bytecodes::_ifgt:
685 case Bytecodes::_ifle:
686 {
687 state.spop();
688 int dest_bci = s.get_dest();
689 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
690 assert(s.next_bci() == limit_bci, "branch must end block");
691 successors.push(_methodBlocks->block_containing(dest_bci));
692 break;
693 }
694 case Bytecodes::_if_icmpeq:
695 case Bytecodes::_if_icmpne:
696 case Bytecodes::_if_icmplt:
697 case Bytecodes::_if_icmpge:
698 case Bytecodes::_if_icmpgt:
699 case Bytecodes::_if_icmple:
700 {
701 state.spop();
702 state.spop();
703 int dest_bci = s.get_dest();
704 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
705 assert(s.next_bci() == limit_bci, "branch must end block");
706 successors.push(_methodBlocks->block_containing(dest_bci));
707 break;
708 }
709 case Bytecodes::_if_acmpeq:
710 case Bytecodes::_if_acmpne:
711 {
712 set_method_escape(state.apop());
713 set_method_escape(state.apop());
714 int dest_bci = s.get_dest();
715 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
716 assert(s.next_bci() == limit_bci, "branch must end block");
717 successors.push(_methodBlocks->block_containing(dest_bci));
718 break;
719 }
720 case Bytecodes::_goto:
721 {
722 int dest_bci = s.get_dest();
723 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
724 assert(s.next_bci() == limit_bci, "branch must end block");
725 successors.push(_methodBlocks->block_containing(dest_bci));
726 fall_through = false;
727 break;
728 }
729 case Bytecodes::_jsr:
730 {
731 int dest_bci = s.get_dest();
732 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
733 assert(s.next_bci() == limit_bci, "branch must end block");
734 state.apush(empty_map);
735 successors.push(_methodBlocks->block_containing(dest_bci));
736 fall_through = false;
737 break;
738 }
739 case Bytecodes::_ret:
740 // we don't track the destination of a "ret" instruction
741 assert(s.next_bci() == limit_bci, "branch must end block");
742 fall_through = false;
743 break;
744 case Bytecodes::_return:
745 assert(s.next_bci() == limit_bci, "return must end block");
746 fall_through = false;
747 break;
748 case Bytecodes::_tableswitch:
749 {
750 state.spop();
751 Bytecode_tableswitch* switch_ = Bytecode_tableswitch_at(s.cur_bcp());
752 int len = switch_->length();
753 int dest_bci;
754 for (int i = 0; i < len; i++) {
755 dest_bci = s.cur_bci() + switch_->dest_offset_at(i);
756 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
757 successors.push(_methodBlocks->block_containing(dest_bci));
758 }
759 dest_bci = s.cur_bci() + switch_->default_offset();
760 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
761 successors.push(_methodBlocks->block_containing(dest_bci));
762 assert(s.next_bci() == limit_bci, "branch must end block");
763 fall_through = false;
764 break;
765 }
766 case Bytecodes::_lookupswitch:
767 {
768 state.spop();
769 Bytecode_lookupswitch* switch_ = Bytecode_lookupswitch_at(s.cur_bcp());
770 int len = switch_->number_of_pairs();
771 int dest_bci;
772 for (int i = 0; i < len; i++) {
773 dest_bci = s.cur_bci() + switch_->pair_at(i)->offset();
774 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
775 successors.push(_methodBlocks->block_containing(dest_bci));
776 }
777 dest_bci = s.cur_bci() + switch_->default_offset();
778 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
779 successors.push(_methodBlocks->block_containing(dest_bci));
780 fall_through = false;
781 break;
782 }
783 case Bytecodes::_ireturn:
784 case Bytecodes::_freturn:
785 state.spop();
786 fall_through = false;
787 break;
788 case Bytecodes::_lreturn:
789 case Bytecodes::_dreturn:
790 state.lpop();
791 fall_through = false;
792 break;
793 case Bytecodes::_areturn:
794 set_returned(state.apop());
795 fall_through = false;
796 break;
797 case Bytecodes::_getstatic:
798 case Bytecodes::_getfield:
799 { bool will_link;
800 ciField* field = s.get_field(will_link);
801 BasicType field_type = field->type()->basic_type();
802 if (s.cur_bc() != Bytecodes::_getstatic) {
803 set_method_escape(state.apop());
804 }
805 if (field_type == T_OBJECT || field_type == T_ARRAY) {
806 state.apush(unknown_obj);
807 } else if (type2size[field_type] == 1) {
808 state.spush();
809 } else {
810 state.lpush();
811 }
812 }
813 break;
814 case Bytecodes::_putstatic:
815 case Bytecodes::_putfield:
816 { bool will_link;
817 ciField* field = s.get_field(will_link);
818 BasicType field_type = field->type()->basic_type();
819 if (field_type == T_OBJECT || field_type == T_ARRAY) {
820 set_global_escape(state.apop());
821 } else if (type2size[field_type] == 1) {
822 state.spop();
823 } else {
824 state.lpop();
825 }
826 if (s.cur_bc() != Bytecodes::_putstatic) {
827 ArgumentMap p = state.apop();
828 set_method_escape(p);
829 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize);
830 }
831 }
832 break;
833 case Bytecodes::_invokevirtual:
834 case Bytecodes::_invokespecial:
835 case Bytecodes::_invokestatic:
836 case Bytecodes::_invokeinterface:
837 { bool will_link;
838 ciMethod* target = s.get_method(will_link);
839 ciKlass* holder = s.get_declared_method_holder();
840 invoke(state, s.cur_bc(), target, holder);
841 ciType* return_type = target->return_type();
842 if (!return_type->is_primitive_type()) {
843 state.apush(unknown_obj);
844 } else if (return_type->is_one_word()) {
845 state.spush();
846 } else if (return_type->is_two_word()) {
847 state.lpush();
848 }
849 }
850 break;
851 case Bytecodes::_xxxunusedxxx:
852 ShouldNotReachHere();
853 break;
854 case Bytecodes::_new:
855 state.apush(allocated_obj);
856 break;
857 case Bytecodes::_newarray:
858 case Bytecodes::_anewarray:
859 state.spop();
860 state.apush(allocated_obj);
861 break;
862 case Bytecodes::_multianewarray:
863 { int i = s.cur_bcp()[3];
864 while (i-- > 0) state.spop();
865 state.apush(allocated_obj);
866 }
867 break;
868 case Bytecodes::_arraylength:
869 set_method_escape(state.apop());
870 state.spush();
871 break;
872 case Bytecodes::_athrow:
873 set_global_escape(state.apop());
874 fall_through = false;
875 break;
876 case Bytecodes::_checkcast:
877 { ArgumentMap obj = state.apop();
878 set_method_escape(obj);
879 state.apush(obj);
880 }
881 break;
882 case Bytecodes::_instanceof:
883 set_method_escape(state.apop());
884 state.spush();
885 break;
886 case Bytecodes::_monitorenter:
887 case Bytecodes::_monitorexit:
888 state.apop();
889 break;
890 case Bytecodes::_wide:
891 ShouldNotReachHere();
892 break;
893 case Bytecodes::_ifnull:
894 case Bytecodes::_ifnonnull:
895 {
896 set_method_escape(state.apop());
897 int dest_bci = s.get_dest();
898 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
899 assert(s.next_bci() == limit_bci, "branch must end block");
900 successors.push(_methodBlocks->block_containing(dest_bci));
901 break;
902 }
903 case Bytecodes::_goto_w:
904 {
905 int dest_bci = s.get_far_dest();
906 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
907 assert(s.next_bci() == limit_bci, "branch must end block");
908 successors.push(_methodBlocks->block_containing(dest_bci));
909 fall_through = false;
910 break;
911 }
912 case Bytecodes::_jsr_w:
913 {
914 int dest_bci = s.get_far_dest();
915 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
916 assert(s.next_bci() == limit_bci, "branch must end block");
917 state.apush(empty_map);
918 successors.push(_methodBlocks->block_containing(dest_bci));
919 fall_through = false;
920 break;
921 }
922 case Bytecodes::_breakpoint:
923 break;
924 default:
925 ShouldNotReachHere();
926 break;
927 }
928
929 }
930 if (fall_through) {
931 int fall_through_bci = s.cur_bci();
932 if (fall_through_bci < _method->code_size()) {
933 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start.");
934 successors.push(_methodBlocks->block_containing(fall_through_bci));
935 }
936 }
937 }
938
939 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) {
940 StateInfo *d_state = blockstates + dest->index();
941 int nlocals = _method->max_locals();
942
943 // exceptions may cause transfer of control to handlers in the middle of a
944 // block, so we don't merge the incoming state of exception handlers
945 if (dest->is_handler())
946 return;
947 if (!d_state->_initialized ) {
948 // destination not initialized, just copy
949 for (int i = 0; i < nlocals; i++) {
950 d_state->_vars[i] = s_state->_vars[i];
951 }
952 for (int i = 0; i < s_state->_stack_height; i++) {
953 d_state->_stack[i] = s_state->_stack[i];
954 }
955 d_state->_stack_height = s_state->_stack_height;
956 d_state->_max_stack = s_state->_max_stack;
957 d_state->_initialized = true;
958 } else if (!dest->processed()) {
959 // we have not yet walked the bytecodes of dest, we can merge
960 // the states
961 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
962 for (int i = 0; i < nlocals; i++) {
963 d_state->_vars[i].set_union(s_state->_vars[i]);
964 }
965 for (int i = 0; i < s_state->_stack_height; i++) {
966 d_state->_stack[i].set_union(s_state->_stack[i]);
967 }
968 } else {
969 // the bytecodes of dest have already been processed, mark any
970 // arguments in the source state which are not in the dest state
971 // as global escape.
972 // Future refinement: we only need to mark these variable to the
973 // maximum escape of any variables in dest state
974 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
975 ArgumentMap extra_vars;
976 for (int i = 0; i < nlocals; i++) {
977 ArgumentMap t;
978 t = s_state->_vars[i];
979 t.set_difference(d_state->_vars[i]);
980 extra_vars.set_union(t);
981 }
982 for (int i = 0; i < s_state->_stack_height; i++) {
983 ArgumentMap t;
984 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i];
985 t.clear();
986 t = s_state->_stack[i];
987 t.set_difference(d_state->_stack[i]);
988 extra_vars.set_union(t);
989 }
990 set_global_escape(extra_vars);
991 }
992 }
993
994 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) {
995 int numblocks = _methodBlocks->num_blocks();
996 int stkSize = _method->max_stack();
997 int numLocals = _method->max_locals();
998 StateInfo state;
999
1000 int datacount = (numblocks + 1) * (stkSize + numLocals);
1001 int datasize = datacount * sizeof(ArgumentMap);
1002 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo));
1003 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize);
1004 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap();
1005 ArgumentMap *dp = statedata;
1006 state._vars = dp;
1007 dp += numLocals;
1008 state._stack = dp;
1009 dp += stkSize;
1010 state._initialized = false;
1011 state._max_stack = stkSize;
1012 for (int i = 0; i < numblocks; i++) {
1013 blockstates[i]._vars = dp;
1014 dp += numLocals;
1015 blockstates[i]._stack = dp;
1016 dp += stkSize;
1017 blockstates[i]._initialized = false;
1018 blockstates[i]._stack_height = 0;
1019 blockstates[i]._max_stack = stkSize;
1020 }
1021 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL);
1022 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL);
1023
1024 _methodBlocks->clear_processed();
1025
1026 // initialize block 0 state from method signature
1027 ArgumentMap allVars; // all oop arguments to method
1028 ciSignature* sig = method()->signature();
1029 int j = 0;
1030 ciBlock* first_blk = _methodBlocks->block_containing(0);
1031 int fb_i = first_blk->index();
1032 if (!method()->is_static()) {
1033 // record information for "this"
1034 blockstates[fb_i]._vars[j].set(j);
1035 allVars.add(j);
1036 j++;
1037 }
1038 for (int i = 0; i < sig->count(); i++) {
1039 ciType* t = sig->type_at(i);
1040 if (!t->is_primitive_type()) {
1041 blockstates[fb_i]._vars[j].set(j);
1042 allVars.add(j);
1043 }
1044 j += t->size();
1045 }
1046 blockstates[fb_i]._initialized = true;
1047 assert(j == _arg_size, "just checking");
1048
1049 ArgumentMap unknown_map;
1050 unknown_map.add_unknown();
1051
1052 worklist.push(first_blk);
1053 while(worklist.length() > 0) {
1054 ciBlock *blk = worklist.pop();
1055 StateInfo *blkState = blockstates + blk->index();
1056 if (blk->is_handler() || blk->is_ret_target()) {
1057 // for an exception handler or a target of a ret instruction, we assume the worst case,
1058 // that any variable could contain any argument
1059 for (int i = 0; i < numLocals; i++) {
1060 state._vars[i] = allVars;
1061 }
1062 if (blk->is_handler()) {
1063 state._stack_height = 1;
1064 } else {
1065 state._stack_height = blkState->_stack_height;
1066 }
1067 for (int i = 0; i < state._stack_height; i++) {
1068 // ??? should this be unknown_map ???
1069 state._stack[i] = allVars;
1070 }
1071 } else {
1072 for (int i = 0; i < numLocals; i++) {
1073 state._vars[i] = blkState->_vars[i];
1074 }
1075 for (int i = 0; i < blkState->_stack_height; i++) {
1076 state._stack[i] = blkState->_stack[i];
1077 }
1078 state._stack_height = blkState->_stack_height;
1079 }
1080 iterate_one_block(blk, state, successors);
1081 // if this block has any exception handlers, push them
1082 // onto successor list
1083 if (blk->has_handler()) {
1084 DEBUG_ONLY(int handler_count = 0;)
1085 int blk_start = blk->start_bci();
1086 int blk_end = blk->limit_bci();
1087 for (int i = 0; i < numblocks; i++) {
1088 ciBlock *b = _methodBlocks->block(i);
1089 if (b->is_handler()) {
1090 int ex_start = b->ex_start_bci();
1091 int ex_end = b->ex_limit_bci();
1092 if ((ex_start >= blk_start && ex_start < blk_end) ||
1093 (ex_end > blk_start && ex_end <= blk_end)) {
1094 successors.push(b);
1095 }
1096 DEBUG_ONLY(handler_count++;)
1097 }
1098 }
1099 assert(handler_count > 0, "must find at least one handler");
1100 }
1101 // merge computed variable state with successors
1102 while(successors.length() > 0) {
1103 ciBlock *succ = successors.pop();
1104 merge_block_states(blockstates, succ, &state);
1105 if (!succ->processed())
1106 worklist.push(succ);
1107 }
1108 }
1109 }
1110
1111 bool BCEscapeAnalyzer::do_analysis() {
1112 Arena* arena = CURRENT_ENV->arena();
1113 // identify basic blocks
1114 _methodBlocks = _method->get_method_blocks();
1115
1116 iterate_blocks(arena);
1117 // TEMPORARY
1118 return true;
1119 }
1120
1121 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() {
1122 vmIntrinsics::ID iid = method()->intrinsic_id();
1123
1124 if (iid == vmIntrinsics::_getClass ||
1125 iid == vmIntrinsics::_fillInStackTrace ||
1126 iid == vmIntrinsics::_hashCode)
1127 return iid;
1128 else
1129 return vmIntrinsics::_none;
1130 }
1131
1132 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) {
1133 ArgumentMap arg;
1134 arg.clear();
1135 switch (iid) {
1136 case vmIntrinsics::_getClass:
1137 _return_local = false;
1138 break;
1139 case vmIntrinsics::_fillInStackTrace:
1140 arg.set(0); // 'this'
1141 set_returned(arg);
1142 break;
1143 case vmIntrinsics::_hashCode:
1144 // initialized state is correct
1145 break;
1146 default:
1147 assert(false, "unexpected intrinsic");
1148 }
1149 return true;
1150 }
1151
1152 void BCEscapeAnalyzer::initialize() {
1153 int i;
1154
1155 // clear escape information (method may have been deoptimized)
1156 methodData()->clear_escape_info();
1157
1158 // initialize escape state of object parameters
1159 ciSignature* sig = method()->signature();
1160 int j = 0;
1161 if (!method()->is_static()) {
1162 _arg_local.set_bit(0);
1163 _arg_stack.set_bit(0);
1164 j++;
1165 }
1166 for (i = 0; i < sig->count(); i++) {
1167 ciType* t = sig->type_at(i);
1168 if (!t->is_primitive_type()) {
1169 _arg_local.set_bit(j);
1170 _arg_stack.set_bit(j);
1171 }
1172 j += t->size();
1173 }
1174 assert(j == _arg_size, "just checking");
1175
1176 // start with optimistic assumption
1177 ciType *rt = _method->return_type();
1178 if (rt->is_primitive_type()) {
1179 _return_local = false;
1180 _return_allocated = false;
1181 } else {
1182 _return_local = true;
1183 _return_allocated = true;
1184 }
1185 _allocated_escapes = false;
1186 _unknown_modified = false;
1187 }
1188
1189 void BCEscapeAnalyzer::clear_escape_info() {
1190 ciSignature* sig = method()->signature();
1191 int arg_count = sig->count();
1192 ArgumentMap var;
1193 if (!method()->is_static()) {
1194 arg_count++; // allow for "this"
1195 }
1196 for (int i = 0; i < arg_count; i++) {
1197 set_arg_modified(i, OFFSET_ANY, 4);
1198 var.clear();
1199 var.set(i);
1200 set_modified(var, OFFSET_ANY, 4);
1201 set_global_escape(var);
1202 }
1203 _arg_local.clear();
1204 _arg_stack.clear();
1205 _arg_returned.clear();
1206 _return_local = false;
1207 _return_allocated = false;
1208 _allocated_escapes = true;
1209 _unknown_modified = true;
1210 }
1211
1212
1213 void BCEscapeAnalyzer::compute_escape_info() {
1214 int i;
1215 assert(!methodData()->has_escape_info(), "do not overwrite escape info");
1216
1217 vmIntrinsics::ID iid = known_intrinsic();
1218
1219 // check if method can be analyzed
1220 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized()
1221 || _level > MaxBCEAEstimateLevel
1222 || method()->code_size() > MaxBCEAEstimateSize)) {
1223 if (BCEATraceLevel >= 1) {
1224 tty->print("Skipping method because: ");
1225 if (method()->is_abstract())
1226 tty->print_cr("method is abstract.");
1227 else if (method()->is_native())
1228 tty->print_cr("method is native.");
1229 else if (!method()->holder()->is_initialized())
1230 tty->print_cr("class of method is not initialized.");
1231 else if (_level > MaxBCEAEstimateLevel)
1232 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).",
1233 _level, MaxBCEAEstimateLevel);
1234 else if (method()->code_size() > MaxBCEAEstimateSize)
1235 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.",
1236 method()->code_size(), MaxBCEAEstimateSize);
1237 else
1238 ShouldNotReachHere();
1239 }
1240 clear_escape_info();
1241
1242 return;
1243 }
1244
1245 if (BCEATraceLevel >= 1) {
1246 tty->print("[EA] estimating escape information for");
1247 if (iid != vmIntrinsics::_none)
1248 tty->print(" intrinsic");
1249 method()->print_short_name();
1250 tty->print_cr(" (%d bytes)", method()->code_size());
1251 }
1252
1253 bool success;
1254
1255 initialize();
1256
1257 // Do not scan method if it has no object parameters and
1258 // does not returns an object (_return_allocated is set in initialize()).
1259 if (_arg_local.is_empty() && !_return_allocated) {
1260 // Clear all info since method's bytecode was not analysed and
1261 // set pessimistic escape information.
1262 clear_escape_info();
1263 methodData()->set_eflag(methodDataOopDesc::allocated_escapes);
1264 methodData()->set_eflag(methodDataOopDesc::unknown_modified);
1265 methodData()->set_eflag(methodDataOopDesc::estimated);
1266 return;
1267 }
1268
1269 if (iid != vmIntrinsics::_none)
1270 success = compute_escape_for_intrinsic(iid);
1271 else {
1272 success = do_analysis();
1273 }
1274
1275 // don't store interprocedural escape information if it introduces
1276 // dependencies or if method data is empty
1277 //
1278 if (!has_dependencies() && !methodData()->is_empty()) {
1279 for (i = 0; i < _arg_size; i++) {
1280 if (_arg_local.at(i)) {
1281 assert(_arg_stack.at(i), "inconsistent escape info");
1282 methodData()->set_arg_local(i);
1283 methodData()->set_arg_stack(i);
1284 } else if (_arg_stack.at(i)) {
1285 methodData()->set_arg_stack(i);
1286 }
1287 if (_arg_returned.at(i)) {
1288 methodData()->set_arg_returned(i);
1289 }
1290 methodData()->set_arg_modified(i, _arg_modified[i]);
1291 }
1292 if (_return_local) {
1293 methodData()->set_eflag(methodDataOopDesc::return_local);
1294 }
1295 if (_return_allocated) {
1296 methodData()->set_eflag(methodDataOopDesc::return_allocated);
1297 }
1298 if (_allocated_escapes) {
1299 methodData()->set_eflag(methodDataOopDesc::allocated_escapes);
1300 }
1301 if (_unknown_modified) {
1302 methodData()->set_eflag(methodDataOopDesc::unknown_modified);
1303 }
1304 methodData()->set_eflag(methodDataOopDesc::estimated);
1305 }
1306 }
1307
1308 void BCEscapeAnalyzer::read_escape_info() {
1309 assert(methodData()->has_escape_info(), "no escape info available");
1310
1311 // read escape information from method descriptor
1312 for (int i = 0; i < _arg_size; i++) {
1313 _arg_local.at_put(i, methodData()->is_arg_local(i));
1314 _arg_stack.at_put(i, methodData()->is_arg_stack(i));
1315 _arg_returned.at_put(i, methodData()->is_arg_returned(i));
1316 _arg_modified[i] = methodData()->arg_modified(i);
1317 }
1318 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local);
1319 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated);
1320 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes);
1321 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified);
1322
1323 }
1324
1325 #ifndef PRODUCT
1326 void BCEscapeAnalyzer::dump() {
1327 tty->print("[EA] estimated escape information for");
1328 method()->print_short_name();
1329 tty->print_cr(has_dependencies() ? " (not stored)" : "");
1330 tty->print(" non-escaping args: ");
1331 _arg_local.print_on(tty);
1332 tty->print(" stack-allocatable args: ");
1333 _arg_stack.print_on(tty);
1334 if (_return_local) {
1335 tty->print(" returned args: ");
1336 _arg_returned.print_on(tty);
1337 } else if (is_return_allocated()) {
1338 tty->print_cr(" return allocated value");
1339 } else {
1340 tty->print_cr(" return non-local value");
1341 }
1342 tty->print(" modified args: ");
1343 for (int i = 0; i < _arg_size; i++) {
1344 if (_arg_modified[i] == 0)
1345 tty->print(" 0");
1346 else
1347 tty->print(" 0x%x", _arg_modified[i]);
1348 }
1349 tty->cr();
1350 tty->print(" flags: ");
1351 if (_return_allocated)
1352 tty->print(" return_allocated");
1353 if (_allocated_escapes)
1354 tty->print(" allocated_escapes");
1355 if (_unknown_modified)
1356 tty->print(" unknown_modified");
1357 tty->cr();
1358 }
1359 #endif
1360
1361 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent)
1362 : _conservative(method == NULL || !EstimateArgEscape)
1363 , _method(method)
1364 , _methodData(method ? method->method_data() : NULL)
1365 , _arg_size(method ? method->arg_size() : 0)
1366 , _stack()
1367 , _arg_local(_arg_size)
1368 , _arg_stack(_arg_size)
1369 , _arg_returned(_arg_size)
1370 , _dirty(_arg_size)
1371 , _return_local(false)
1372 , _return_allocated(false)
1373 , _allocated_escapes(false)
1374 , _unknown_modified(false)
1375 , _dependencies()
1376 , _parent(parent)
1377 , _level(parent == NULL ? 0 : parent->level() + 1) {
1378 if (!_conservative) {
1379 _arg_local.clear();
1380 _arg_stack.clear();
1381 _arg_returned.clear();
1382 _dirty.clear();
1383 Arena* arena = CURRENT_ENV->arena();
1384 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint));
1385 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint));
1386
1387 if (methodData() == NULL)
1388 return;
1389 bool printit = _method->should_print_assembly();
1390 if (methodData()->has_escape_info()) {
1391 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s",
1392 method->holder()->name()->as_utf8(),
1393 method->name()->as_utf8()));
1394 read_escape_info();
1395 } else {
1396 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s",
1397 method->holder()->name()->as_utf8(),
1398 method->name()->as_utf8()));
1399
1400 compute_escape_info();
1401 methodData()->update_escape_info();
1402 }
1403 #ifndef PRODUCT
1404 if (BCEATraceLevel >= 3) {
1405 // dump escape information
1406 dump();
1407 }
1408 #endif
1409 }
1410 }
1411
1412 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) {
1413 if(!has_dependencies())
1414 return;
1415 for (int i = 0; i < _dependencies.length(); i+=2) {
1416 ciKlass *k = _dependencies[i]->as_klass();
1417 ciMethod *m = _dependencies[i+1]->as_method();
1418 deps->assert_unique_concrete_method(k, m);
1419 }
1420 }