1 /*
2 * Copyright (c) 2005, 2009, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25
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() { guarantee(_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) { guarantee(_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(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.test(i))
130 return true;
131 }
132 return false;
133 }
134
135 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) {
136 for (int i = 0; i < _arg_size; i++) {
137 if (vars.contains(i)) {
138 bm >>= 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 {
369 // Avoid calling get_constant() which will try to allocate
370 // unloaded constant. We need only constant's type.
371 int index = s.get_constant_pool_index();
372 constantTag tag = s.get_constant_pool_tag(index);
373 if (tag.is_long() || tag.is_double()) {
374 // Only longs and doubles use 2 stack slots.
375 state.lpush();
376 } else {
377 state.spush();
378 }
379 break;
380 }
381 case Bytecodes::_aload:
382 state.apush(state._vars[s.get_index()]);
383 break;
384 case Bytecodes::_iload:
385 case Bytecodes::_fload:
386 case Bytecodes::_iload_0:
387 case Bytecodes::_iload_1:
388 case Bytecodes::_iload_2:
389 case Bytecodes::_iload_3:
390 case Bytecodes::_fload_0:
391 case Bytecodes::_fload_1:
392 case Bytecodes::_fload_2:
393 case Bytecodes::_fload_3:
394 state.spush();
395 break;
396 case Bytecodes::_lload:
397 case Bytecodes::_dload:
398 case Bytecodes::_lload_0:
399 case Bytecodes::_lload_1:
400 case Bytecodes::_lload_2:
401 case Bytecodes::_lload_3:
402 case Bytecodes::_dload_0:
403 case Bytecodes::_dload_1:
404 case Bytecodes::_dload_2:
405 case Bytecodes::_dload_3:
406 state.lpush();
407 break;
408 case Bytecodes::_aload_0:
409 state.apush(state._vars[0]);
410 break;
411 case Bytecodes::_aload_1:
412 state.apush(state._vars[1]);
413 break;
414 case Bytecodes::_aload_2:
415 state.apush(state._vars[2]);
416 break;
417 case Bytecodes::_aload_3:
418 state.apush(state._vars[3]);
419 break;
420 case Bytecodes::_iaload:
421 case Bytecodes::_faload:
422 case Bytecodes::_baload:
423 case Bytecodes::_caload:
424 case Bytecodes::_saload:
425 state.spop();
426 set_method_escape(state.apop());
427 state.spush();
428 break;
429 case Bytecodes::_laload:
430 case Bytecodes::_daload:
431 state.spop();
432 set_method_escape(state.apop());
433 state.lpush();
434 break;
435 case Bytecodes::_aaload:
436 { state.spop();
437 ArgumentMap array = state.apop();
438 set_method_escape(array);
439 state.apush(unknown_obj);
440 set_dirty(array);
441 }
442 break;
443 case Bytecodes::_istore:
444 case Bytecodes::_fstore:
445 case Bytecodes::_istore_0:
446 case Bytecodes::_istore_1:
447 case Bytecodes::_istore_2:
448 case Bytecodes::_istore_3:
449 case Bytecodes::_fstore_0:
450 case Bytecodes::_fstore_1:
451 case Bytecodes::_fstore_2:
452 case Bytecodes::_fstore_3:
453 state.spop();
454 break;
455 case Bytecodes::_lstore:
456 case Bytecodes::_dstore:
457 case Bytecodes::_lstore_0:
458 case Bytecodes::_lstore_1:
459 case Bytecodes::_lstore_2:
460 case Bytecodes::_lstore_3:
461 case Bytecodes::_dstore_0:
462 case Bytecodes::_dstore_1:
463 case Bytecodes::_dstore_2:
464 case Bytecodes::_dstore_3:
465 state.lpop();
466 break;
467 case Bytecodes::_astore:
468 state._vars[s.get_index()] = state.apop();
469 break;
470 case Bytecodes::_astore_0:
471 state._vars[0] = state.apop();
472 break;
473 case Bytecodes::_astore_1:
474 state._vars[1] = state.apop();
475 break;
476 case Bytecodes::_astore_2:
477 state._vars[2] = state.apop();
478 break;
479 case Bytecodes::_astore_3:
480 state._vars[3] = state.apop();
481 break;
482 case Bytecodes::_iastore:
483 case Bytecodes::_fastore:
484 case Bytecodes::_bastore:
485 case Bytecodes::_castore:
486 case Bytecodes::_sastore:
487 {
488 state.spop();
489 state.spop();
490 ArgumentMap arr = state.apop();
491 set_method_escape(arr);
492 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
493 break;
494 }
495 case Bytecodes::_lastore:
496 case Bytecodes::_dastore:
497 {
498 state.lpop();
499 state.spop();
500 ArgumentMap arr = state.apop();
501 set_method_escape(arr);
502 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize);
503 break;
504 }
505 case Bytecodes::_aastore:
506 {
507 set_global_escape(state.apop());
508 state.spop();
509 ArgumentMap arr = state.apop();
510 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize);
511 break;
512 }
513 case Bytecodes::_pop:
514 state.raw_pop();
515 break;
516 case Bytecodes::_pop2:
517 state.raw_pop();
518 state.raw_pop();
519 break;
520 case Bytecodes::_dup:
521 { ArgumentMap w1 = state.raw_pop();
522 state.raw_push(w1);
523 state.raw_push(w1);
524 }
525 break;
526 case Bytecodes::_dup_x1:
527 { ArgumentMap w1 = state.raw_pop();
528 ArgumentMap w2 = state.raw_pop();
529 state.raw_push(w1);
530 state.raw_push(w2);
531 state.raw_push(w1);
532 }
533 break;
534 case Bytecodes::_dup_x2:
535 { ArgumentMap w1 = state.raw_pop();
536 ArgumentMap w2 = state.raw_pop();
537 ArgumentMap w3 = state.raw_pop();
538 state.raw_push(w1);
539 state.raw_push(w3);
540 state.raw_push(w2);
541 state.raw_push(w1);
542 }
543 break;
544 case Bytecodes::_dup2:
545 { ArgumentMap w1 = state.raw_pop();
546 ArgumentMap w2 = state.raw_pop();
547 state.raw_push(w2);
548 state.raw_push(w1);
549 state.raw_push(w2);
550 state.raw_push(w1);
551 }
552 break;
553 case Bytecodes::_dup2_x1:
554 { ArgumentMap w1 = state.raw_pop();
555 ArgumentMap w2 = state.raw_pop();
556 ArgumentMap w3 = state.raw_pop();
557 state.raw_push(w2);
558 state.raw_push(w1);
559 state.raw_push(w3);
560 state.raw_push(w2);
561 state.raw_push(w1);
562 }
563 break;
564 case Bytecodes::_dup2_x2:
565 { ArgumentMap w1 = state.raw_pop();
566 ArgumentMap w2 = state.raw_pop();
567 ArgumentMap w3 = state.raw_pop();
568 ArgumentMap w4 = state.raw_pop();
569 state.raw_push(w2);
570 state.raw_push(w1);
571 state.raw_push(w4);
572 state.raw_push(w3);
573 state.raw_push(w2);
574 state.raw_push(w1);
575 }
576 break;
577 case Bytecodes::_swap:
578 { ArgumentMap w1 = state.raw_pop();
579 ArgumentMap w2 = state.raw_pop();
580 state.raw_push(w1);
581 state.raw_push(w2);
582 }
583 break;
584 case Bytecodes::_iadd:
585 case Bytecodes::_fadd:
586 case Bytecodes::_isub:
587 case Bytecodes::_fsub:
588 case Bytecodes::_imul:
589 case Bytecodes::_fmul:
590 case Bytecodes::_idiv:
591 case Bytecodes::_fdiv:
592 case Bytecodes::_irem:
593 case Bytecodes::_frem:
594 case Bytecodes::_iand:
595 case Bytecodes::_ior:
596 case Bytecodes::_ixor:
597 state.spop();
598 state.spop();
599 state.spush();
600 break;
601 case Bytecodes::_ladd:
602 case Bytecodes::_dadd:
603 case Bytecodes::_lsub:
604 case Bytecodes::_dsub:
605 case Bytecodes::_lmul:
606 case Bytecodes::_dmul:
607 case Bytecodes::_ldiv:
608 case Bytecodes::_ddiv:
609 case Bytecodes::_lrem:
610 case Bytecodes::_drem:
611 case Bytecodes::_land:
612 case Bytecodes::_lor:
613 case Bytecodes::_lxor:
614 state.lpop();
615 state.lpop();
616 state.lpush();
617 break;
618 case Bytecodes::_ishl:
619 case Bytecodes::_ishr:
620 case Bytecodes::_iushr:
621 state.spop();
622 state.spop();
623 state.spush();
624 break;
625 case Bytecodes::_lshl:
626 case Bytecodes::_lshr:
627 case Bytecodes::_lushr:
628 state.spop();
629 state.lpop();
630 state.lpush();
631 break;
632 case Bytecodes::_ineg:
633 case Bytecodes::_fneg:
634 state.spop();
635 state.spush();
636 break;
637 case Bytecodes::_lneg:
638 case Bytecodes::_dneg:
639 state.lpop();
640 state.lpush();
641 break;
642 case Bytecodes::_iinc:
643 break;
644 case Bytecodes::_i2l:
645 case Bytecodes::_i2d:
646 case Bytecodes::_f2l:
647 case Bytecodes::_f2d:
648 state.spop();
649 state.lpush();
650 break;
651 case Bytecodes::_i2f:
652 case Bytecodes::_f2i:
653 state.spop();
654 state.spush();
655 break;
656 case Bytecodes::_l2i:
657 case Bytecodes::_l2f:
658 case Bytecodes::_d2i:
659 case Bytecodes::_d2f:
660 state.lpop();
661 state.spush();
662 break;
663 case Bytecodes::_l2d:
664 case Bytecodes::_d2l:
665 state.lpop();
666 state.lpush();
667 break;
668 case Bytecodes::_i2b:
669 case Bytecodes::_i2c:
670 case Bytecodes::_i2s:
671 state.spop();
672 state.spush();
673 break;
674 case Bytecodes::_lcmp:
675 case Bytecodes::_dcmpl:
676 case Bytecodes::_dcmpg:
677 state.lpop();
678 state.lpop();
679 state.spush();
680 break;
681 case Bytecodes::_fcmpl:
682 case Bytecodes::_fcmpg:
683 state.spop();
684 state.spop();
685 state.spush();
686 break;
687 case Bytecodes::_ifeq:
688 case Bytecodes::_ifne:
689 case Bytecodes::_iflt:
690 case Bytecodes::_ifge:
691 case Bytecodes::_ifgt:
692 case Bytecodes::_ifle:
693 {
694 state.spop();
695 int dest_bci = s.get_dest();
696 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
697 assert(s.next_bci() == limit_bci, "branch must end block");
698 successors.push(_methodBlocks->block_containing(dest_bci));
699 break;
700 }
701 case Bytecodes::_if_icmpeq:
702 case Bytecodes::_if_icmpne:
703 case Bytecodes::_if_icmplt:
704 case Bytecodes::_if_icmpge:
705 case Bytecodes::_if_icmpgt:
706 case Bytecodes::_if_icmple:
707 {
708 state.spop();
709 state.spop();
710 int dest_bci = s.get_dest();
711 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
712 assert(s.next_bci() == limit_bci, "branch must end block");
713 successors.push(_methodBlocks->block_containing(dest_bci));
714 break;
715 }
716 case Bytecodes::_if_acmpeq:
717 case Bytecodes::_if_acmpne:
718 {
719 set_method_escape(state.apop());
720 set_method_escape(state.apop());
721 int dest_bci = s.get_dest();
722 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
723 assert(s.next_bci() == limit_bci, "branch must end block");
724 successors.push(_methodBlocks->block_containing(dest_bci));
725 break;
726 }
727 case Bytecodes::_goto:
728 {
729 int dest_bci = s.get_dest();
730 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
731 assert(s.next_bci() == limit_bci, "branch must end block");
732 successors.push(_methodBlocks->block_containing(dest_bci));
733 fall_through = false;
734 break;
735 }
736 case Bytecodes::_jsr:
737 {
738 int dest_bci = s.get_dest();
739 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
740 assert(s.next_bci() == limit_bci, "branch must end block");
741 state.apush(empty_map);
742 successors.push(_methodBlocks->block_containing(dest_bci));
743 fall_through = false;
744 break;
745 }
746 case Bytecodes::_ret:
747 // we don't track the destination of a "ret" instruction
748 assert(s.next_bci() == limit_bci, "branch must end block");
749 fall_through = false;
750 break;
751 case Bytecodes::_return:
752 assert(s.next_bci() == limit_bci, "return must end block");
753 fall_through = false;
754 break;
755 case Bytecodes::_tableswitch:
756 {
757 state.spop();
758 Bytecode_tableswitch* switch_ = Bytecode_tableswitch_at(s.cur_bcp());
759 int len = switch_->length();
760 int dest_bci;
761 for (int i = 0; i < len; i++) {
762 dest_bci = s.cur_bci() + switch_->dest_offset_at(i);
763 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
764 successors.push(_methodBlocks->block_containing(dest_bci));
765 }
766 dest_bci = s.cur_bci() + switch_->default_offset();
767 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
768 successors.push(_methodBlocks->block_containing(dest_bci));
769 assert(s.next_bci() == limit_bci, "branch must end block");
770 fall_through = false;
771 break;
772 }
773 case Bytecodes::_lookupswitch:
774 {
775 state.spop();
776 Bytecode_lookupswitch* switch_ = Bytecode_lookupswitch_at(s.cur_bcp());
777 int len = switch_->number_of_pairs();
778 int dest_bci;
779 for (int i = 0; i < len; i++) {
780 dest_bci = s.cur_bci() + switch_->pair_at(i)->offset();
781 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
782 successors.push(_methodBlocks->block_containing(dest_bci));
783 }
784 dest_bci = s.cur_bci() + switch_->default_offset();
785 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
786 successors.push(_methodBlocks->block_containing(dest_bci));
787 fall_through = false;
788 break;
789 }
790 case Bytecodes::_ireturn:
791 case Bytecodes::_freturn:
792 state.spop();
793 fall_through = false;
794 break;
795 case Bytecodes::_lreturn:
796 case Bytecodes::_dreturn:
797 state.lpop();
798 fall_through = false;
799 break;
800 case Bytecodes::_areturn:
801 set_returned(state.apop());
802 fall_through = false;
803 break;
804 case Bytecodes::_getstatic:
805 case Bytecodes::_getfield:
806 { bool will_link;
807 ciField* field = s.get_field(will_link);
808 BasicType field_type = field->type()->basic_type();
809 if (s.cur_bc() != Bytecodes::_getstatic) {
810 set_method_escape(state.apop());
811 }
812 if (field_type == T_OBJECT || field_type == T_ARRAY) {
813 state.apush(unknown_obj);
814 } else if (type2size[field_type] == 1) {
815 state.spush();
816 } else {
817 state.lpush();
818 }
819 }
820 break;
821 case Bytecodes::_putstatic:
822 case Bytecodes::_putfield:
823 { bool will_link;
824 ciField* field = s.get_field(will_link);
825 BasicType field_type = field->type()->basic_type();
826 if (field_type == T_OBJECT || field_type == T_ARRAY) {
827 set_global_escape(state.apop());
828 } else if (type2size[field_type] == 1) {
829 state.spop();
830 } else {
831 state.lpop();
832 }
833 if (s.cur_bc() != Bytecodes::_putstatic) {
834 ArgumentMap p = state.apop();
835 set_method_escape(p);
836 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize);
837 }
838 }
839 break;
840 case Bytecodes::_invokevirtual:
841 case Bytecodes::_invokespecial:
842 case Bytecodes::_invokestatic:
843 case Bytecodes::_invokedynamic:
844 case Bytecodes::_invokeinterface:
845 { bool will_link;
846 ciMethod* target = s.get_method(will_link);
847 ciKlass* holder = s.get_declared_method_holder();
848 invoke(state, s.cur_bc(), target, holder);
849 ciType* return_type = target->return_type();
850 if (!return_type->is_primitive_type()) {
851 state.apush(unknown_obj);
852 } else if (return_type->is_one_word()) {
853 state.spush();
854 } else if (return_type->is_two_word()) {
855 state.lpush();
856 }
857 }
858 break;
859 case Bytecodes::_new:
860 state.apush(allocated_obj);
861 break;
862 case Bytecodes::_newarray:
863 case Bytecodes::_anewarray:
864 state.spop();
865 state.apush(allocated_obj);
866 break;
867 case Bytecodes::_multianewarray:
868 { int i = s.cur_bcp()[3];
869 while (i-- > 0) state.spop();
870 state.apush(allocated_obj);
871 }
872 break;
873 case Bytecodes::_arraylength:
874 set_method_escape(state.apop());
875 state.spush();
876 break;
877 case Bytecodes::_athrow:
878 set_global_escape(state.apop());
879 fall_through = false;
880 break;
881 case Bytecodes::_checkcast:
882 { ArgumentMap obj = state.apop();
883 set_method_escape(obj);
884 state.apush(obj);
885 }
886 break;
887 case Bytecodes::_instanceof:
888 set_method_escape(state.apop());
889 state.spush();
890 break;
891 case Bytecodes::_monitorenter:
892 case Bytecodes::_monitorexit:
893 state.apop();
894 break;
895 case Bytecodes::_wide:
896 ShouldNotReachHere();
897 break;
898 case Bytecodes::_ifnull:
899 case Bytecodes::_ifnonnull:
900 {
901 set_method_escape(state.apop());
902 int dest_bci = s.get_dest();
903 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
904 assert(s.next_bci() == limit_bci, "branch must end block");
905 successors.push(_methodBlocks->block_containing(dest_bci));
906 break;
907 }
908 case Bytecodes::_goto_w:
909 {
910 int dest_bci = s.get_far_dest();
911 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
912 assert(s.next_bci() == limit_bci, "branch must end block");
913 successors.push(_methodBlocks->block_containing(dest_bci));
914 fall_through = false;
915 break;
916 }
917 case Bytecodes::_jsr_w:
918 {
919 int dest_bci = s.get_far_dest();
920 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
921 assert(s.next_bci() == limit_bci, "branch must end block");
922 state.apush(empty_map);
923 successors.push(_methodBlocks->block_containing(dest_bci));
924 fall_through = false;
925 break;
926 }
927 case Bytecodes::_breakpoint:
928 break;
929 default:
930 ShouldNotReachHere();
931 break;
932 }
933
934 }
935 if (fall_through) {
936 int fall_through_bci = s.cur_bci();
937 if (fall_through_bci < _method->code_size()) {
938 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start.");
939 successors.push(_methodBlocks->block_containing(fall_through_bci));
940 }
941 }
942 }
943
944 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) {
945 StateInfo *d_state = blockstates + dest->index();
946 int nlocals = _method->max_locals();
947
948 // exceptions may cause transfer of control to handlers in the middle of a
949 // block, so we don't merge the incoming state of exception handlers
950 if (dest->is_handler())
951 return;
952 if (!d_state->_initialized ) {
953 // destination not initialized, just copy
954 for (int i = 0; i < nlocals; i++) {
955 d_state->_vars[i] = s_state->_vars[i];
956 }
957 for (int i = 0; i < s_state->_stack_height; i++) {
958 d_state->_stack[i] = s_state->_stack[i];
959 }
960 d_state->_stack_height = s_state->_stack_height;
961 d_state->_max_stack = s_state->_max_stack;
962 d_state->_initialized = true;
963 } else if (!dest->processed()) {
964 // we have not yet walked the bytecodes of dest, we can merge
965 // the states
966 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
967 for (int i = 0; i < nlocals; i++) {
968 d_state->_vars[i].set_union(s_state->_vars[i]);
969 }
970 for (int i = 0; i < s_state->_stack_height; i++) {
971 d_state->_stack[i].set_union(s_state->_stack[i]);
972 }
973 } else {
974 // the bytecodes of dest have already been processed, mark any
975 // arguments in the source state which are not in the dest state
976 // as global escape.
977 // Future refinement: we only need to mark these variable to the
978 // maximum escape of any variables in dest state
979 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
980 ArgumentMap extra_vars;
981 for (int i = 0; i < nlocals; i++) {
982 ArgumentMap t;
983 t = s_state->_vars[i];
984 t.set_difference(d_state->_vars[i]);
985 extra_vars.set_union(t);
986 }
987 for (int i = 0; i < s_state->_stack_height; i++) {
988 ArgumentMap t;
989 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i];
990 t.clear();
991 t = s_state->_stack[i];
992 t.set_difference(d_state->_stack[i]);
993 extra_vars.set_union(t);
994 }
995 set_global_escape(extra_vars);
996 }
997 }
998
999 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) {
1000 int numblocks = _methodBlocks->num_blocks();
1001 int stkSize = _method->max_stack();
1002 int numLocals = _method->max_locals();
1003 StateInfo state;
1004
1005 int datacount = (numblocks + 1) * (stkSize + numLocals);
1006 int datasize = datacount * sizeof(ArgumentMap);
1007 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo));
1008 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize);
1009 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap();
1010 ArgumentMap *dp = statedata;
1011 state._vars = dp;
1012 dp += numLocals;
1013 state._stack = dp;
1014 dp += stkSize;
1015 state._initialized = false;
1016 state._max_stack = stkSize;
1017 for (int i = 0; i < numblocks; i++) {
1018 blockstates[i]._vars = dp;
1019 dp += numLocals;
1020 blockstates[i]._stack = dp;
1021 dp += stkSize;
1022 blockstates[i]._initialized = false;
1023 blockstates[i]._stack_height = 0;
1024 blockstates[i]._max_stack = stkSize;
1025 }
1026 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL);
1027 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL);
1028
1029 _methodBlocks->clear_processed();
1030
1031 // initialize block 0 state from method signature
1032 ArgumentMap allVars; // all oop arguments to method
1033 ciSignature* sig = method()->signature();
1034 int j = 0;
1035 ciBlock* first_blk = _methodBlocks->block_containing(0);
1036 int fb_i = first_blk->index();
1037 if (!method()->is_static()) {
1038 // record information for "this"
1039 blockstates[fb_i]._vars[j].set(j);
1040 allVars.add(j);
1041 j++;
1042 }
1043 for (int i = 0; i < sig->count(); i++) {
1044 ciType* t = sig->type_at(i);
1045 if (!t->is_primitive_type()) {
1046 blockstates[fb_i]._vars[j].set(j);
1047 allVars.add(j);
1048 }
1049 j += t->size();
1050 }
1051 blockstates[fb_i]._initialized = true;
1052 assert(j == _arg_size, "just checking");
1053
1054 ArgumentMap unknown_map;
1055 unknown_map.add_unknown();
1056
1057 worklist.push(first_blk);
1058 while(worklist.length() > 0) {
1059 ciBlock *blk = worklist.pop();
1060 StateInfo *blkState = blockstates + blk->index();
1061 if (blk->is_handler() || blk->is_ret_target()) {
1062 // for an exception handler or a target of a ret instruction, we assume the worst case,
1063 // that any variable could contain any argument
1064 for (int i = 0; i < numLocals; i++) {
1065 state._vars[i] = allVars;
1066 }
1067 if (blk->is_handler()) {
1068 state._stack_height = 1;
1069 } else {
1070 state._stack_height = blkState->_stack_height;
1071 }
1072 for (int i = 0; i < state._stack_height; i++) {
1073 // ??? should this be unknown_map ???
1074 state._stack[i] = allVars;
1075 }
1076 } else {
1077 for (int i = 0; i < numLocals; i++) {
1078 state._vars[i] = blkState->_vars[i];
1079 }
1080 for (int i = 0; i < blkState->_stack_height; i++) {
1081 state._stack[i] = blkState->_stack[i];
1082 }
1083 state._stack_height = blkState->_stack_height;
1084 }
1085 iterate_one_block(blk, state, successors);
1086 // if this block has any exception handlers, push them
1087 // onto successor list
1088 if (blk->has_handler()) {
1089 DEBUG_ONLY(int handler_count = 0;)
1090 int blk_start = blk->start_bci();
1091 int blk_end = blk->limit_bci();
1092 for (int i = 0; i < numblocks; i++) {
1093 ciBlock *b = _methodBlocks->block(i);
1094 if (b->is_handler()) {
1095 int ex_start = b->ex_start_bci();
1096 int ex_end = b->ex_limit_bci();
1097 if ((ex_start >= blk_start && ex_start < blk_end) ||
1098 (ex_end > blk_start && ex_end <= blk_end)) {
1099 successors.push(b);
1100 }
1101 DEBUG_ONLY(handler_count++;)
1102 }
1103 }
1104 assert(handler_count > 0, "must find at least one handler");
1105 }
1106 // merge computed variable state with successors
1107 while(successors.length() > 0) {
1108 ciBlock *succ = successors.pop();
1109 merge_block_states(blockstates, succ, &state);
1110 if (!succ->processed())
1111 worklist.push(succ);
1112 }
1113 }
1114 }
1115
1116 bool BCEscapeAnalyzer::do_analysis() {
1117 Arena* arena = CURRENT_ENV->arena();
1118 // identify basic blocks
1119 _methodBlocks = _method->get_method_blocks();
1120
1121 iterate_blocks(arena);
1122 // TEMPORARY
1123 return true;
1124 }
1125
1126 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() {
1127 vmIntrinsics::ID iid = method()->intrinsic_id();
1128
1129 if (iid == vmIntrinsics::_getClass ||
1130 iid == vmIntrinsics::_fillInStackTrace ||
1131 iid == vmIntrinsics::_hashCode)
1132 return iid;
1133 else
1134 return vmIntrinsics::_none;
1135 }
1136
1137 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) {
1138 ArgumentMap arg;
1139 arg.clear();
1140 switch (iid) {
1141 case vmIntrinsics::_getClass:
1142 _return_local = false;
1143 break;
1144 case vmIntrinsics::_fillInStackTrace:
1145 arg.set(0); // 'this'
1146 set_returned(arg);
1147 break;
1148 case vmIntrinsics::_hashCode:
1149 // initialized state is correct
1150 break;
1151 default:
1152 assert(false, "unexpected intrinsic");
1153 }
1154 return true;
1155 }
1156
1157 void BCEscapeAnalyzer::initialize() {
1158 int i;
1159
1160 // clear escape information (method may have been deoptimized)
1161 methodData()->clear_escape_info();
1162
1163 // initialize escape state of object parameters
1164 ciSignature* sig = method()->signature();
1165 int j = 0;
1166 if (!method()->is_static()) {
1167 _arg_local.set(0);
1168 _arg_stack.set(0);
1169 j++;
1170 }
1171 for (i = 0; i < sig->count(); i++) {
1172 ciType* t = sig->type_at(i);
1173 if (!t->is_primitive_type()) {
1174 _arg_local.set(j);
1175 _arg_stack.set(j);
1176 }
1177 j += t->size();
1178 }
1179 assert(j == _arg_size, "just checking");
1180
1181 // start with optimistic assumption
1182 ciType *rt = _method->return_type();
1183 if (rt->is_primitive_type()) {
1184 _return_local = false;
1185 _return_allocated = false;
1186 } else {
1187 _return_local = true;
1188 _return_allocated = true;
1189 }
1190 _allocated_escapes = false;
1191 _unknown_modified = false;
1192 }
1193
1194 void BCEscapeAnalyzer::clear_escape_info() {
1195 ciSignature* sig = method()->signature();
1196 int arg_count = sig->count();
1197 ArgumentMap var;
1198 if (!method()->is_static()) {
1199 arg_count++; // allow for "this"
1200 }
1201 for (int i = 0; i < arg_count; i++) {
1202 set_arg_modified(i, OFFSET_ANY, 4);
1203 var.clear();
1204 var.set(i);
1205 set_modified(var, OFFSET_ANY, 4);
1206 set_global_escape(var);
1207 }
1208 _arg_local.Clear();
1209 _arg_stack.Clear();
1210 _arg_returned.Clear();
1211 _return_local = false;
1212 _return_allocated = false;
1213 _allocated_escapes = true;
1214 _unknown_modified = true;
1215 }
1216
1217
1218 void BCEscapeAnalyzer::compute_escape_info() {
1219 int i;
1220 assert(!methodData()->has_escape_info(), "do not overwrite escape info");
1221
1222 vmIntrinsics::ID iid = known_intrinsic();
1223
1224 // check if method can be analyzed
1225 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized()
1226 || _level > MaxBCEAEstimateLevel
1227 || method()->code_size() > MaxBCEAEstimateSize)) {
1228 if (BCEATraceLevel >= 1) {
1229 tty->print("Skipping method because: ");
1230 if (method()->is_abstract())
1231 tty->print_cr("method is abstract.");
1232 else if (method()->is_native())
1233 tty->print_cr("method is native.");
1234 else if (!method()->holder()->is_initialized())
1235 tty->print_cr("class of method is not initialized.");
1236 else if (_level > MaxBCEAEstimateLevel)
1237 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).",
1238 _level, MaxBCEAEstimateLevel);
1239 else if (method()->code_size() > MaxBCEAEstimateSize)
1240 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.",
1241 method()->code_size(), MaxBCEAEstimateSize);
1242 else
1243 ShouldNotReachHere();
1244 }
1245 clear_escape_info();
1246
1247 return;
1248 }
1249
1250 if (BCEATraceLevel >= 1) {
1251 tty->print("[EA] estimating escape information for");
1252 if (iid != vmIntrinsics::_none)
1253 tty->print(" intrinsic");
1254 method()->print_short_name();
1255 tty->print_cr(" (%d bytes)", method()->code_size());
1256 }
1257
1258 bool success;
1259
1260 initialize();
1261
1262 // Do not scan method if it has no object parameters and
1263 // does not returns an object (_return_allocated is set in initialize()).
1264 if (_arg_local.Size() == 0 && !_return_allocated) {
1265 // Clear all info since method's bytecode was not analysed and
1266 // set pessimistic escape information.
1267 clear_escape_info();
1268 methodData()->set_eflag(methodDataOopDesc::allocated_escapes);
1269 methodData()->set_eflag(methodDataOopDesc::unknown_modified);
1270 methodData()->set_eflag(methodDataOopDesc::estimated);
1271 return;
1272 }
1273
1274 if (iid != vmIntrinsics::_none)
1275 success = compute_escape_for_intrinsic(iid);
1276 else {
1277 success = do_analysis();
1278 }
1279
1280 // don't store interprocedural escape information if it introduces
1281 // dependencies or if method data is empty
1282 //
1283 if (!has_dependencies() && !methodData()->is_empty()) {
1284 for (i = 0; i < _arg_size; i++) {
1285 if (_arg_local.test(i)) {
1286 assert(_arg_stack.test(i), "inconsistent escape info");
1287 methodData()->set_arg_local(i);
1288 methodData()->set_arg_stack(i);
1289 } else if (_arg_stack.test(i)) {
1290 methodData()->set_arg_stack(i);
1291 }
1292 if (_arg_returned.test(i)) {
1293 methodData()->set_arg_returned(i);
1294 }
1295 methodData()->set_arg_modified(i, _arg_modified[i]);
1296 }
1297 if (_return_local) {
1298 methodData()->set_eflag(methodDataOopDesc::return_local);
1299 }
1300 if (_return_allocated) {
1301 methodData()->set_eflag(methodDataOopDesc::return_allocated);
1302 }
1303 if (_allocated_escapes) {
1304 methodData()->set_eflag(methodDataOopDesc::allocated_escapes);
1305 }
1306 if (_unknown_modified) {
1307 methodData()->set_eflag(methodDataOopDesc::unknown_modified);
1308 }
1309 methodData()->set_eflag(methodDataOopDesc::estimated);
1310 }
1311 }
1312
1313 void BCEscapeAnalyzer::read_escape_info() {
1314 assert(methodData()->has_escape_info(), "no escape info available");
1315
1316 // read escape information from method descriptor
1317 for (int i = 0; i < _arg_size; i++) {
1318 if (methodData()->is_arg_local(i))
1319 _arg_local.set(i);
1320 if (methodData()->is_arg_stack(i))
1321 _arg_stack.set(i);
1322 if (methodData()->is_arg_returned(i))
1323 _arg_returned.set(i);
1324 _arg_modified[i] = methodData()->arg_modified(i);
1325 }
1326 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local);
1327 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated);
1328 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes);
1329 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified);
1330
1331 }
1332
1333 #ifndef PRODUCT
1334 void BCEscapeAnalyzer::dump() {
1335 tty->print("[EA] estimated escape information for");
1336 method()->print_short_name();
1337 tty->print_cr(has_dependencies() ? " (not stored)" : "");
1338 tty->print(" non-escaping args: ");
1339 _arg_local.print_on(tty);
1340 tty->print(" stack-allocatable args: ");
1341 _arg_stack.print_on(tty);
1342 if (_return_local) {
1343 tty->print(" returned args: ");
1344 _arg_returned.print_on(tty);
1345 } else if (is_return_allocated()) {
1346 tty->print_cr(" return allocated value");
1347 } else {
1348 tty->print_cr(" return non-local value");
1349 }
1350 tty->print(" modified args: ");
1351 for (int i = 0; i < _arg_size; i++) {
1352 if (_arg_modified[i] == 0)
1353 tty->print(" 0");
1354 else
1355 tty->print(" 0x%x", _arg_modified[i]);
1356 }
1357 tty->cr();
1358 tty->print(" flags: ");
1359 if (_return_allocated)
1360 tty->print(" return_allocated");
1361 if (_allocated_escapes)
1362 tty->print(" allocated_escapes");
1363 if (_unknown_modified)
1364 tty->print(" unknown_modified");
1365 tty->cr();
1366 }
1367 #endif
1368
1369 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent)
1370 : _conservative(method == NULL || !EstimateArgEscape)
1371 , _arena(CURRENT_ENV->arena())
1372 , _method(method)
1373 , _methodData(method ? method->method_data() : NULL)
1374 , _arg_size(method ? method->arg_size() : 0)
1375 , _arg_local(_arena)
1376 , _arg_stack(_arena)
1377 , _arg_returned(_arena)
1378 , _dirty(_arena)
1379 , _return_local(false)
1380 , _return_allocated(false)
1381 , _allocated_escapes(false)
1382 , _unknown_modified(false)
1383 , _dependencies(_arena, 4, 0, NULL)
1384 , _parent(parent)
1385 , _level(parent == NULL ? 0 : parent->level() + 1) {
1386 if (!_conservative) {
1387 _arg_local.Clear();
1388 _arg_stack.Clear();
1389 _arg_returned.Clear();
1390 _dirty.Clear();
1391 Arena* arena = CURRENT_ENV->arena();
1392 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint));
1393 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint));
1394
1395 if (methodData() == NULL)
1396 return;
1397 bool printit = _method->should_print_assembly();
1398 if (methodData()->has_escape_info()) {
1399 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s",
1400 method->holder()->name()->as_utf8(),
1401 method->name()->as_utf8()));
1402 read_escape_info();
1403 } else {
1404 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s",
1405 method->holder()->name()->as_utf8(),
1406 method->name()->as_utf8()));
1407
1408 compute_escape_info();
1409 methodData()->update_escape_info();
1410 }
1411 #ifndef PRODUCT
1412 if (BCEATraceLevel >= 3) {
1413 // dump escape information
1414 dump();
1415 }
1416 #endif
1417 }
1418 }
1419
1420 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) {
1421 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) {
1422 // Also record evol dependencies so redefinition of the
1423 // callee will trigger recompilation.
1424 deps->assert_evol_method(method());
1425 }
1426 for (int i = 0; i < _dependencies.length(); i+=2) {
1427 ciKlass *k = _dependencies.at(i)->as_klass();
1428 ciMethod *m = _dependencies.at(i+1)->as_method();
1429 deps->assert_unique_concrete_method(k, m);
1430 }
1431 }