1 /*
2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/bcEscapeAnalyzer.hpp"
27 #include "ci/ciConstant.hpp"
28 #include "ci/ciField.hpp"
29 #include "ci/ciMethodBlocks.hpp"
30 #include "ci/ciStreams.hpp"
31 #include "interpreter/bytecode.hpp"
32 #include "utilities/bitMap.inline.hpp"
33
34
35
36 #ifndef PRODUCT
37 #define TRACE_BCEA(level, code) \
38 if (EstimateArgEscape && BCEATraceLevel >= level) { \
39 code; \
40 }
41 #else
42 #define TRACE_BCEA(level, code)
43 #endif
44
45 // Maintain a map of which aguments a local variable or
46 // stack slot may contain. In addition to tracking
47 // arguments, it tracks two special values, "allocated"
48 // which represents any object allocated in the current
49 // method, and "unknown" which is any other object.
50 // Up to 30 arguments are handled, with the last one
51 // representing summary information for any extra arguments
52 class BCEscapeAnalyzer::ArgumentMap {
53 uint _bits;
54 enum {MAXBIT = 29,
55 ALLOCATED = 1,
56 UNKNOWN = 2};
57
58 uint int_to_bit(uint e) const {
59 if (e > MAXBIT)
60 e = MAXBIT;
61 return (1 << (e + 2));
62 }
63
64 public:
65 ArgumentMap() { _bits = 0;}
66 void set_bits(uint bits) { _bits = bits;}
67 uint get_bits() const { return _bits;}
68 void clear() { _bits = 0;}
69 void set_all() { _bits = ~0u; }
70 bool is_empty() const { return _bits == 0; }
71 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; }
72 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); }
73 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; }
74 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; }
75 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; }
76 void set(uint var) { _bits = int_to_bit(var); }
77 void add(uint var) { _bits |= int_to_bit(var); }
78 void add_unknown() { _bits = UNKNOWN; }
79 void add_allocated() { _bits = ALLOCATED; }
80 void set_union(const ArgumentMap &am) { _bits |= am._bits; }
81 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; }
82 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; }
83 void operator=(const ArgumentMap &am) { _bits = am._bits; }
84 bool operator==(const ArgumentMap &am) { return _bits == am._bits; }
85 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; }
86 };
87
88 class BCEscapeAnalyzer::StateInfo {
89 public:
90 ArgumentMap *_vars;
91 ArgumentMap *_stack;
92 short _stack_height;
93 short _max_stack;
94 bool _initialized;
95 ArgumentMap empty_map;
96
97 StateInfo() {
98 empty_map.clear();
99 }
100
101 ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; }
102 ArgumentMap apop() { return raw_pop(); }
103 void spop() { raw_pop(); }
104 void lpop() { spop(); spop(); }
105 void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; }
106 void apush(ArgumentMap i) { raw_push(i); }
107 void spush() { raw_push(empty_map); }
108 void lpush() { spush(); spush(); }
109
110 };
111
112 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) {
113 for (int i = 0; i < _arg_size; i++) {
114 if (vars.contains(i))
115 _arg_returned.set(i);
116 }
117 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated());
118 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars());
119 }
120
121 // return true if any element of vars is an argument
122 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) {
123 for (int i = 0; i < _arg_size; i++) {
124 if (vars.contains(i))
125 return true;
126 }
127 return false;
128 }
129
130 // return true if any element of vars is an arg_stack argument
131 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){
132 if (_conservative)
133 return true;
134 for (int i = 0; i < _arg_size; i++) {
135 if (vars.contains(i) && _arg_stack.test(i))
136 return true;
137 }
138 return false;
139 }
140
141 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) {
142 for (int i = 0; i < _arg_size; i++) {
143 if (vars.contains(i)) {
144 bm >>= i;
145 }
146 }
147 }
148
149 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) {
150 clear_bits(vars, _arg_local);
151 }
152
153 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars) {
154 clear_bits(vars, _arg_local);
155 clear_bits(vars, _arg_stack);
156 if (vars.contains_allocated())
157 _allocated_escapes = true;
158 }
159
160 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) {
161 clear_bits(vars, _dirty);
162 }
163
164 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) {
165
166 for (int i = 0; i < _arg_size; i++) {
167 if (vars.contains(i)) {
168 set_arg_modified(i, offs, size);
169 }
170 }
171 if (vars.contains_unknown())
172 _unknown_modified = true;
173 }
174
175 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) {
176 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) {
177 if (scope->method() == callee) {
178 return true;
179 }
180 }
181 return false;
182 }
183
184 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) {
185 if (offset == OFFSET_ANY)
186 return _arg_modified[arg] != 0;
187 assert(arg >= 0 && arg < _arg_size, "must be an argument.");
188 bool modified = false;
189 int l = offset / HeapWordSize;
190 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize;
191 if (l > ARG_OFFSET_MAX)
192 l = ARG_OFFSET_MAX;
193 if (h > ARG_OFFSET_MAX+1)
194 h = ARG_OFFSET_MAX + 1;
195 for (int i = l; i < h; i++) {
196 modified = modified || (_arg_modified[arg] & (1 << i)) != 0;
197 }
198 return modified;
199 }
200
201 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) {
202 if (offset == OFFSET_ANY) {
203 _arg_modified[arg] = (uint) -1;
204 return;
205 }
206 assert(arg >= 0 && arg < _arg_size, "must be an argument.");
207 int l = offset / HeapWordSize;
208 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize;
209 if (l > ARG_OFFSET_MAX)
210 l = ARG_OFFSET_MAX;
211 if (h > ARG_OFFSET_MAX+1)
212 h = ARG_OFFSET_MAX + 1;
213 for (int i = l; i < h; i++) {
214 _arg_modified[arg] |= (1 << i);
215 }
216 }
217
218 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) {
219 int i;
220
221 // retrieve information about the callee
222 ciInstanceKlass* klass = target->holder();
223 ciInstanceKlass* calling_klass = method()->holder();
224 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
225 ciInstanceKlass* actual_recv = callee_holder;
226
227 // some methods are obviously bindable without any type checks so
228 // convert them directly to an invokespecial.
229 if (target->is_loaded() && !target->is_abstract() &&
230 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) {
231 code = Bytecodes::_invokespecial;
232 }
233
234 // compute size of arguments
235 int arg_size = target->invoke_arg_size(code);
236 int arg_base = MAX2(state._stack_height - arg_size, 0);
237
238 // direct recursive calls are skipped if they can be bound statically without introducing
239 // dependencies and if parameters are passed at the same position as in the current method
240 // other calls are skipped if there are no unescaped arguments passed to them
241 bool directly_recursive = (method() == target) &&
242 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty());
243
244 // check if analysis of callee can safely be skipped
245 bool skip_callee = true;
246 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) {
247 ArgumentMap arg = state._stack[i];
248 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base));
249 }
250 // For now we conservatively skip invokedynamic.
251 if (code == Bytecodes::_invokedynamic) {
252 skip_callee = true;
253 }
254 if (skip_callee) {
255 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8()));
256 for (i = 0; i < arg_size; i++) {
257 set_method_escape(state.raw_pop());
258 }
259 _unknown_modified = true; // assume the worst since we don't analyze the called method
260 return;
261 }
262
263 // determine actual method (use CHA if necessary)
264 ciMethod* inline_target = NULL;
265 if (target->is_loaded() && klass->is_loaded()
266 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
267 && target->will_link(klass, callee_holder, code)) {
268 if (code == Bytecodes::_invokestatic
269 || code == Bytecodes::_invokespecial
270 || code == Bytecodes::_invokevirtual && target->is_final_method()) {
271 inline_target = target;
272 } else {
273 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
274 }
275 }
276
277 if (inline_target != NULL && !is_recursive_call(inline_target)) {
278 // analyze callee
279 BCEscapeAnalyzer analyzer(inline_target, this);
280
281 // adjust escape state of actual parameters
282 bool must_record_dependencies = false;
283 for (i = arg_size - 1; i >= 0; i--) {
284 ArgumentMap arg = state.raw_pop();
285 if (!is_argument(arg))
286 continue;
287 for (int j = 0; j < _arg_size; j++) {
288 if (arg.contains(j)) {
289 _arg_modified[j] |= analyzer._arg_modified[i];
290 }
291 }
292 if (!is_arg_stack(arg)) {
293 // arguments have already been recognized as escaping
294 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) {
295 set_method_escape(arg);
296 must_record_dependencies = true;
297 } else {
298 set_global_escape(arg);
299 }
300 }
301 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects();
302
303 // record dependencies if at least one parameter retained stack-allocatable
304 if (must_record_dependencies) {
305 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) {
306 _dependencies.append(actual_recv);
307 _dependencies.append(inline_target);
308 }
309 _dependencies.appendAll(analyzer.dependencies());
310 }
311 } else {
312 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.",
313 target->name()->as_utf8()));
314 // conservatively mark all actual parameters as escaping globally
315 for (i = 0; i < arg_size; i++) {
316 ArgumentMap arg = state.raw_pop();
317 if (!is_argument(arg))
318 continue;
319 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
320 set_global_escape(arg);
321 }
322 _unknown_modified = true; // assume the worst since we don't know the called method
323 }
324 }
325
326 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) {
327 return ((~arg_set1) | arg_set2) == 0;
328 }
329
330
331 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) {
332
333 blk->set_processed();
334 ciBytecodeStream s(method());
335 int limit_bci = blk->limit_bci();
336 bool fall_through = false;
337 ArgumentMap allocated_obj;
338 allocated_obj.add_allocated();
339 ArgumentMap unknown_obj;
340 unknown_obj.add_unknown();
341 ArgumentMap empty_map;
342
343 s.reset_to_bci(blk->start_bci());
344 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) {
345 fall_through = true;
346 switch (s.cur_bc()) {
347 case Bytecodes::_nop:
348 break;
349 case Bytecodes::_aconst_null:
350 state.apush(empty_map);
351 break;
352 case Bytecodes::_iconst_m1:
353 case Bytecodes::_iconst_0:
354 case Bytecodes::_iconst_1:
355 case Bytecodes::_iconst_2:
356 case Bytecodes::_iconst_3:
357 case Bytecodes::_iconst_4:
358 case Bytecodes::_iconst_5:
359 case Bytecodes::_fconst_0:
360 case Bytecodes::_fconst_1:
361 case Bytecodes::_fconst_2:
362 case Bytecodes::_bipush:
363 case Bytecodes::_sipush:
364 state.spush();
365 break;
366 case Bytecodes::_lconst_0:
367 case Bytecodes::_lconst_1:
368 case Bytecodes::_dconst_0:
369 case Bytecodes::_dconst_1:
370 state.lpush();
371 break;
372 case Bytecodes::_ldc:
373 case Bytecodes::_ldc_w:
374 case Bytecodes::_ldc2_w:
375 {
376 // Avoid calling get_constant() which will try to allocate
377 // unloaded constant. We need only constant's type.
378 int index = s.get_constant_pool_index();
379 constantTag tag = s.get_constant_pool_tag(index);
380 if (tag.is_long() || tag.is_double()) {
381 // Only longs and doubles use 2 stack slots.
382 state.lpush();
383 } else {
384 state.spush();
385 }
386 break;
387 }
388 case Bytecodes::_aload:
389 state.apush(state._vars[s.get_index()]);
390 break;
391 case Bytecodes::_iload:
392 case Bytecodes::_fload:
393 case Bytecodes::_iload_0:
394 case Bytecodes::_iload_1:
395 case Bytecodes::_iload_2:
396 case Bytecodes::_iload_3:
397 case Bytecodes::_fload_0:
398 case Bytecodes::_fload_1:
399 case Bytecodes::_fload_2:
400 case Bytecodes::_fload_3:
401 state.spush();
402 break;
403 case Bytecodes::_lload:
404 case Bytecodes::_dload:
405 case Bytecodes::_lload_0:
406 case Bytecodes::_lload_1:
407 case Bytecodes::_lload_2:
408 case Bytecodes::_lload_3:
409 case Bytecodes::_dload_0:
410 case Bytecodes::_dload_1:
411 case Bytecodes::_dload_2:
412 case Bytecodes::_dload_3:
413 state.lpush();
414 break;
415 case Bytecodes::_aload_0:
416 state.apush(state._vars[0]);
417 break;
418 case Bytecodes::_aload_1:
419 state.apush(state._vars[1]);
420 break;
421 case Bytecodes::_aload_2:
422 state.apush(state._vars[2]);
423 break;
424 case Bytecodes::_aload_3:
425 state.apush(state._vars[3]);
426 break;
427 case Bytecodes::_iaload:
428 case Bytecodes::_faload:
429 case Bytecodes::_baload:
430 case Bytecodes::_caload:
431 case Bytecodes::_saload:
432 state.spop();
433 set_method_escape(state.apop());
434 state.spush();
435 break;
436 case Bytecodes::_laload:
437 case Bytecodes::_daload:
438 state.spop();
439 set_method_escape(state.apop());
440 state.lpush();
441 break;
442 case Bytecodes::_aaload:
443 { state.spop();
444 ArgumentMap array = state.apop();
445 set_method_escape(array);
446 state.apush(unknown_obj);
447 set_dirty(array);
448 }
449 break;
450 case Bytecodes::_istore:
451 case Bytecodes::_fstore:
452 case Bytecodes::_istore_0:
453 case Bytecodes::_istore_1:
454 case Bytecodes::_istore_2:
455 case Bytecodes::_istore_3:
456 case Bytecodes::_fstore_0:
457 case Bytecodes::_fstore_1:
458 case Bytecodes::_fstore_2:
459 case Bytecodes::_fstore_3:
460 state.spop();
461 break;
462 case Bytecodes::_lstore:
463 case Bytecodes::_dstore:
464 case Bytecodes::_lstore_0:
465 case Bytecodes::_lstore_1:
466 case Bytecodes::_lstore_2:
467 case Bytecodes::_lstore_3:
468 case Bytecodes::_dstore_0:
469 case Bytecodes::_dstore_1:
470 case Bytecodes::_dstore_2:
471 case Bytecodes::_dstore_3:
472 state.lpop();
473 break;
474 case Bytecodes::_astore:
475 state._vars[s.get_index()] = state.apop();
476 break;
477 case Bytecodes::_astore_0:
478 state._vars[0] = state.apop();
479 break;
480 case Bytecodes::_astore_1:
481 state._vars[1] = state.apop();
482 break;
483 case Bytecodes::_astore_2:
484 state._vars[2] = state.apop();
485 break;
486 case Bytecodes::_astore_3:
487 state._vars[3] = state.apop();
488 break;
489 case Bytecodes::_iastore:
490 case Bytecodes::_fastore:
491 case Bytecodes::_bastore:
492 case Bytecodes::_castore:
493 case Bytecodes::_sastore:
494 {
495 state.spop();
496 state.spop();
497 ArgumentMap arr = state.apop();
498 set_method_escape(arr);
499 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
500 break;
501 }
502 case Bytecodes::_lastore:
503 case Bytecodes::_dastore:
504 {
505 state.lpop();
506 state.spop();
507 ArgumentMap arr = state.apop();
508 set_method_escape(arr);
509 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize);
510 break;
511 }
512 case Bytecodes::_aastore:
513 {
514 set_global_escape(state.apop());
515 state.spop();
516 ArgumentMap arr = state.apop();
517 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize);
518 break;
519 }
520 case Bytecodes::_pop:
521 state.raw_pop();
522 break;
523 case Bytecodes::_pop2:
524 state.raw_pop();
525 state.raw_pop();
526 break;
527 case Bytecodes::_dup:
528 { ArgumentMap w1 = state.raw_pop();
529 state.raw_push(w1);
530 state.raw_push(w1);
531 }
532 break;
533 case Bytecodes::_dup_x1:
534 { ArgumentMap w1 = state.raw_pop();
535 ArgumentMap w2 = state.raw_pop();
536 state.raw_push(w1);
537 state.raw_push(w2);
538 state.raw_push(w1);
539 }
540 break;
541 case Bytecodes::_dup_x2:
542 { ArgumentMap w1 = state.raw_pop();
543 ArgumentMap w2 = state.raw_pop();
544 ArgumentMap w3 = state.raw_pop();
545 state.raw_push(w1);
546 state.raw_push(w3);
547 state.raw_push(w2);
548 state.raw_push(w1);
549 }
550 break;
551 case Bytecodes::_dup2:
552 { ArgumentMap w1 = state.raw_pop();
553 ArgumentMap w2 = state.raw_pop();
554 state.raw_push(w2);
555 state.raw_push(w1);
556 state.raw_push(w2);
557 state.raw_push(w1);
558 }
559 break;
560 case Bytecodes::_dup2_x1:
561 { ArgumentMap w1 = state.raw_pop();
562 ArgumentMap w2 = state.raw_pop();
563 ArgumentMap w3 = state.raw_pop();
564 state.raw_push(w2);
565 state.raw_push(w1);
566 state.raw_push(w3);
567 state.raw_push(w2);
568 state.raw_push(w1);
569 }
570 break;
571 case Bytecodes::_dup2_x2:
572 { ArgumentMap w1 = state.raw_pop();
573 ArgumentMap w2 = state.raw_pop();
574 ArgumentMap w3 = state.raw_pop();
575 ArgumentMap w4 = state.raw_pop();
576 state.raw_push(w2);
577 state.raw_push(w1);
578 state.raw_push(w4);
579 state.raw_push(w3);
580 state.raw_push(w2);
581 state.raw_push(w1);
582 }
583 break;
584 case Bytecodes::_swap:
585 { ArgumentMap w1 = state.raw_pop();
586 ArgumentMap w2 = state.raw_pop();
587 state.raw_push(w1);
588 state.raw_push(w2);
589 }
590 break;
591 case Bytecodes::_iadd:
592 case Bytecodes::_fadd:
593 case Bytecodes::_isub:
594 case Bytecodes::_fsub:
595 case Bytecodes::_imul:
596 case Bytecodes::_fmul:
597 case Bytecodes::_idiv:
598 case Bytecodes::_fdiv:
599 case Bytecodes::_irem:
600 case Bytecodes::_frem:
601 case Bytecodes::_iand:
602 case Bytecodes::_ior:
603 case Bytecodes::_ixor:
604 state.spop();
605 state.spop();
606 state.spush();
607 break;
608 case Bytecodes::_ladd:
609 case Bytecodes::_dadd:
610 case Bytecodes::_lsub:
611 case Bytecodes::_dsub:
612 case Bytecodes::_lmul:
613 case Bytecodes::_dmul:
614 case Bytecodes::_ldiv:
615 case Bytecodes::_ddiv:
616 case Bytecodes::_lrem:
617 case Bytecodes::_drem:
618 case Bytecodes::_land:
619 case Bytecodes::_lor:
620 case Bytecodes::_lxor:
621 state.lpop();
622 state.lpop();
623 state.lpush();
624 break;
625 case Bytecodes::_ishl:
626 case Bytecodes::_ishr:
627 case Bytecodes::_iushr:
628 state.spop();
629 state.spop();
630 state.spush();
631 break;
632 case Bytecodes::_lshl:
633 case Bytecodes::_lshr:
634 case Bytecodes::_lushr:
635 state.spop();
636 state.lpop();
637 state.lpush();
638 break;
639 case Bytecodes::_ineg:
640 case Bytecodes::_fneg:
641 state.spop();
642 state.spush();
643 break;
644 case Bytecodes::_lneg:
645 case Bytecodes::_dneg:
646 state.lpop();
647 state.lpush();
648 break;
649 case Bytecodes::_iinc:
650 break;
651 case Bytecodes::_i2l:
652 case Bytecodes::_i2d:
653 case Bytecodes::_f2l:
654 case Bytecodes::_f2d:
655 state.spop();
656 state.lpush();
657 break;
658 case Bytecodes::_i2f:
659 case Bytecodes::_f2i:
660 state.spop();
661 state.spush();
662 break;
663 case Bytecodes::_l2i:
664 case Bytecodes::_l2f:
665 case Bytecodes::_d2i:
666 case Bytecodes::_d2f:
667 state.lpop();
668 state.spush();
669 break;
670 case Bytecodes::_l2d:
671 case Bytecodes::_d2l:
672 state.lpop();
673 state.lpush();
674 break;
675 case Bytecodes::_i2b:
676 case Bytecodes::_i2c:
677 case Bytecodes::_i2s:
678 state.spop();
679 state.spush();
680 break;
681 case Bytecodes::_lcmp:
682 case Bytecodes::_dcmpl:
683 case Bytecodes::_dcmpg:
684 state.lpop();
685 state.lpop();
686 state.spush();
687 break;
688 case Bytecodes::_fcmpl:
689 case Bytecodes::_fcmpg:
690 state.spop();
691 state.spop();
692 state.spush();
693 break;
694 case Bytecodes::_ifeq:
695 case Bytecodes::_ifne:
696 case Bytecodes::_iflt:
697 case Bytecodes::_ifge:
698 case Bytecodes::_ifgt:
699 case Bytecodes::_ifle:
700 {
701 state.spop();
702 int dest_bci = s.get_dest();
703 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
704 assert(s.next_bci() == limit_bci, "branch must end block");
705 successors.push(_methodBlocks->block_containing(dest_bci));
706 break;
707 }
708 case Bytecodes::_if_icmpeq:
709 case Bytecodes::_if_icmpne:
710 case Bytecodes::_if_icmplt:
711 case Bytecodes::_if_icmpge:
712 case Bytecodes::_if_icmpgt:
713 case Bytecodes::_if_icmple:
714 {
715 state.spop();
716 state.spop();
717 int dest_bci = s.get_dest();
718 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
719 assert(s.next_bci() == limit_bci, "branch must end block");
720 successors.push(_methodBlocks->block_containing(dest_bci));
721 break;
722 }
723 case Bytecodes::_if_acmpeq:
724 case Bytecodes::_if_acmpne:
725 {
726 set_method_escape(state.apop());
727 set_method_escape(state.apop());
728 int dest_bci = s.get_dest();
729 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
730 assert(s.next_bci() == limit_bci, "branch must end block");
731 successors.push(_methodBlocks->block_containing(dest_bci));
732 break;
733 }
734 case Bytecodes::_goto:
735 {
736 int dest_bci = s.get_dest();
737 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
738 assert(s.next_bci() == limit_bci, "branch must end block");
739 successors.push(_methodBlocks->block_containing(dest_bci));
740 fall_through = false;
741 break;
742 }
743 case Bytecodes::_jsr:
744 {
745 int dest_bci = s.get_dest();
746 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
747 assert(s.next_bci() == limit_bci, "branch must end block");
748 state.apush(empty_map);
749 successors.push(_methodBlocks->block_containing(dest_bci));
750 fall_through = false;
751 break;
752 }
753 case Bytecodes::_ret:
754 // we don't track the destination of a "ret" instruction
755 assert(s.next_bci() == limit_bci, "branch must end block");
756 fall_through = false;
757 break;
758 case Bytecodes::_return:
759 assert(s.next_bci() == limit_bci, "return must end block");
760 fall_through = false;
761 break;
762 case Bytecodes::_tableswitch:
763 {
764 state.spop();
765 Bytecode_tableswitch sw(&s);
766 int len = sw.length();
767 int dest_bci;
768 for (int i = 0; i < len; i++) {
769 dest_bci = s.cur_bci() + sw.dest_offset_at(i);
770 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
771 successors.push(_methodBlocks->block_containing(dest_bci));
772 }
773 dest_bci = s.cur_bci() + sw.default_offset();
774 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
775 successors.push(_methodBlocks->block_containing(dest_bci));
776 assert(s.next_bci() == limit_bci, "branch must end block");
777 fall_through = false;
778 break;
779 }
780 case Bytecodes::_lookupswitch:
781 {
782 state.spop();
783 Bytecode_lookupswitch sw(&s);
784 int len = sw.number_of_pairs();
785 int dest_bci;
786 for (int i = 0; i < len; i++) {
787 dest_bci = s.cur_bci() + sw.pair_at(i).offset();
788 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
789 successors.push(_methodBlocks->block_containing(dest_bci));
790 }
791 dest_bci = s.cur_bci() + sw.default_offset();
792 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
793 successors.push(_methodBlocks->block_containing(dest_bci));
794 fall_through = false;
795 break;
796 }
797 case Bytecodes::_ireturn:
798 case Bytecodes::_freturn:
799 state.spop();
800 fall_through = false;
801 break;
802 case Bytecodes::_lreturn:
803 case Bytecodes::_dreturn:
804 state.lpop();
805 fall_through = false;
806 break;
807 case Bytecodes::_areturn:
808 set_returned(state.apop());
809 fall_through = false;
810 break;
811 case Bytecodes::_getstatic:
812 case Bytecodes::_getfield:
813 { bool will_link;
814 ciField* field = s.get_field(will_link);
815 BasicType field_type = field->type()->basic_type();
816 if (s.cur_bc() != Bytecodes::_getstatic) {
817 set_method_escape(state.apop());
818 }
819 if (field_type == T_OBJECT || field_type == T_ARRAY) {
820 state.apush(unknown_obj);
821 } else if (type2size[field_type] == 1) {
822 state.spush();
823 } else {
824 state.lpush();
825 }
826 }
827 break;
828 case Bytecodes::_putstatic:
829 case Bytecodes::_putfield:
830 { bool will_link;
831 ciField* field = s.get_field(will_link);
832 BasicType field_type = field->type()->basic_type();
833 if (field_type == T_OBJECT || field_type == T_ARRAY) {
834 set_global_escape(state.apop());
835 } else if (type2size[field_type] == 1) {
836 state.spop();
837 } else {
838 state.lpop();
839 }
840 if (s.cur_bc() != Bytecodes::_putstatic) {
841 ArgumentMap p = state.apop();
842 set_method_escape(p);
843 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize);
844 }
845 }
846 break;
847 case Bytecodes::_invokevirtual:
848 case Bytecodes::_invokespecial:
849 case Bytecodes::_invokestatic:
850 case Bytecodes::_invokedynamic:
851 case Bytecodes::_invokeinterface:
852 { bool will_link;
853 ciMethod* target = s.get_method(will_link);
854 ciKlass* holder = s.get_declared_method_holder();
855 invoke(state, s.cur_bc(), target, holder);
856 ciType* return_type = target->return_type();
857 if (!return_type->is_primitive_type()) {
858 state.apush(unknown_obj);
859 } else if (return_type->is_one_word()) {
860 state.spush();
861 } else if (return_type->is_two_word()) {
862 state.lpush();
863 }
864 }
865 break;
866 case Bytecodes::_new:
867 state.apush(allocated_obj);
868 break;
869 case Bytecodes::_newarray:
870 case Bytecodes::_anewarray:
871 state.spop();
872 state.apush(allocated_obj);
873 break;
874 case Bytecodes::_multianewarray:
875 { int i = s.cur_bcp()[3];
876 while (i-- > 0) state.spop();
877 state.apush(allocated_obj);
878 }
879 break;
880 case Bytecodes::_arraylength:
881 set_method_escape(state.apop());
882 state.spush();
883 break;
884 case Bytecodes::_athrow:
885 set_global_escape(state.apop());
886 fall_through = false;
887 break;
888 case Bytecodes::_checkcast:
889 { ArgumentMap obj = state.apop();
890 set_method_escape(obj);
891 state.apush(obj);
892 }
893 break;
894 case Bytecodes::_instanceof:
895 set_method_escape(state.apop());
896 state.spush();
897 break;
898 case Bytecodes::_monitorenter:
899 case Bytecodes::_monitorexit:
900 state.apop();
901 break;
902 case Bytecodes::_wide:
903 ShouldNotReachHere();
904 break;
905 case Bytecodes::_ifnull:
906 case Bytecodes::_ifnonnull:
907 {
908 set_method_escape(state.apop());
909 int dest_bci = s.get_dest();
910 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
911 assert(s.next_bci() == limit_bci, "branch must end block");
912 successors.push(_methodBlocks->block_containing(dest_bci));
913 break;
914 }
915 case Bytecodes::_goto_w:
916 {
917 int dest_bci = s.get_far_dest();
918 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
919 assert(s.next_bci() == limit_bci, "branch must end block");
920 successors.push(_methodBlocks->block_containing(dest_bci));
921 fall_through = false;
922 break;
923 }
924 case Bytecodes::_jsr_w:
925 {
926 int dest_bci = s.get_far_dest();
927 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
928 assert(s.next_bci() == limit_bci, "branch must end block");
929 state.apush(empty_map);
930 successors.push(_methodBlocks->block_containing(dest_bci));
931 fall_through = false;
932 break;
933 }
934 case Bytecodes::_breakpoint:
935 break;
936 default:
937 ShouldNotReachHere();
938 break;
939 }
940
941 }
942 if (fall_through) {
943 int fall_through_bci = s.cur_bci();
944 if (fall_through_bci < _method->code_size()) {
945 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start.");
946 successors.push(_methodBlocks->block_containing(fall_through_bci));
947 }
948 }
949 }
950
951 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) {
952 StateInfo *d_state = blockstates + dest->index();
953 int nlocals = _method->max_locals();
954
955 // exceptions may cause transfer of control to handlers in the middle of a
956 // block, so we don't merge the incoming state of exception handlers
957 if (dest->is_handler())
958 return;
959 if (!d_state->_initialized ) {
960 // destination not initialized, just copy
961 for (int i = 0; i < nlocals; i++) {
962 d_state->_vars[i] = s_state->_vars[i];
963 }
964 for (int i = 0; i < s_state->_stack_height; i++) {
965 d_state->_stack[i] = s_state->_stack[i];
966 }
967 d_state->_stack_height = s_state->_stack_height;
968 d_state->_max_stack = s_state->_max_stack;
969 d_state->_initialized = true;
970 } else if (!dest->processed()) {
971 // we have not yet walked the bytecodes of dest, we can merge
972 // the states
973 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
974 for (int i = 0; i < nlocals; i++) {
975 d_state->_vars[i].set_union(s_state->_vars[i]);
976 }
977 for (int i = 0; i < s_state->_stack_height; i++) {
978 d_state->_stack[i].set_union(s_state->_stack[i]);
979 }
980 } else {
981 // the bytecodes of dest have already been processed, mark any
982 // arguments in the source state which are not in the dest state
983 // as global escape.
984 // Future refinement: we only need to mark these variable to the
985 // maximum escape of any variables in dest state
986 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
987 ArgumentMap extra_vars;
988 for (int i = 0; i < nlocals; i++) {
989 ArgumentMap t;
990 t = s_state->_vars[i];
991 t.set_difference(d_state->_vars[i]);
992 extra_vars.set_union(t);
993 }
994 for (int i = 0; i < s_state->_stack_height; i++) {
995 ArgumentMap t;
996 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i];
997 t.clear();
998 t = s_state->_stack[i];
999 t.set_difference(d_state->_stack[i]);
1000 extra_vars.set_union(t);
1001 }
1002 set_global_escape(extra_vars);
1003 }
1004 }
1005
1006 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) {
1007 int numblocks = _methodBlocks->num_blocks();
1008 int stkSize = _method->max_stack();
1009 int numLocals = _method->max_locals();
1010 StateInfo state;
1011
1012 int datacount = (numblocks + 1) * (stkSize + numLocals);
1013 int datasize = datacount * sizeof(ArgumentMap);
1014 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo));
1015 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize);
1016 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap();
1017 ArgumentMap *dp = statedata;
1018 state._vars = dp;
1019 dp += numLocals;
1020 state._stack = dp;
1021 dp += stkSize;
1022 state._initialized = false;
1023 state._max_stack = stkSize;
1024 for (int i = 0; i < numblocks; i++) {
1025 blockstates[i]._vars = dp;
1026 dp += numLocals;
1027 blockstates[i]._stack = dp;
1028 dp += stkSize;
1029 blockstates[i]._initialized = false;
1030 blockstates[i]._stack_height = 0;
1031 blockstates[i]._max_stack = stkSize;
1032 }
1033 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL);
1034 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL);
1035
1036 _methodBlocks->clear_processed();
1037
1038 // initialize block 0 state from method signature
1039 ArgumentMap allVars; // all oop arguments to method
1040 ciSignature* sig = method()->signature();
1041 int j = 0;
1042 ciBlock* first_blk = _methodBlocks->block_containing(0);
1043 int fb_i = first_blk->index();
1044 if (!method()->is_static()) {
1045 // record information for "this"
1046 blockstates[fb_i]._vars[j].set(j);
1047 allVars.add(j);
1048 j++;
1049 }
1050 for (int i = 0; i < sig->count(); i++) {
1051 ciType* t = sig->type_at(i);
1052 if (!t->is_primitive_type()) {
1053 blockstates[fb_i]._vars[j].set(j);
1054 allVars.add(j);
1055 }
1056 j += t->size();
1057 }
1058 blockstates[fb_i]._initialized = true;
1059 assert(j == _arg_size, "just checking");
1060
1061 ArgumentMap unknown_map;
1062 unknown_map.add_unknown();
1063
1064 worklist.push(first_blk);
1065 while(worklist.length() > 0) {
1066 ciBlock *blk = worklist.pop();
1067 StateInfo *blkState = blockstates + blk->index();
1068 if (blk->is_handler() || blk->is_ret_target()) {
1069 // for an exception handler or a target of a ret instruction, we assume the worst case,
1070 // that any variable could contain any argument
1071 for (int i = 0; i < numLocals; i++) {
1072 state._vars[i] = allVars;
1073 }
1074 if (blk->is_handler()) {
1075 state._stack_height = 1;
1076 } else {
1077 state._stack_height = blkState->_stack_height;
1078 }
1079 for (int i = 0; i < state._stack_height; i++) {
1080 // ??? should this be unknown_map ???
1081 state._stack[i] = allVars;
1082 }
1083 } else {
1084 for (int i = 0; i < numLocals; i++) {
1085 state._vars[i] = blkState->_vars[i];
1086 }
1087 for (int i = 0; i < blkState->_stack_height; i++) {
1088 state._stack[i] = blkState->_stack[i];
1089 }
1090 state._stack_height = blkState->_stack_height;
1091 }
1092 iterate_one_block(blk, state, successors);
1093 // if this block has any exception handlers, push them
1094 // onto successor list
1095 if (blk->has_handler()) {
1096 DEBUG_ONLY(int handler_count = 0;)
1097 int blk_start = blk->start_bci();
1098 int blk_end = blk->limit_bci();
1099 for (int i = 0; i < numblocks; i++) {
1100 ciBlock *b = _methodBlocks->block(i);
1101 if (b->is_handler()) {
1102 int ex_start = b->ex_start_bci();
1103 int ex_end = b->ex_limit_bci();
1104 if ((ex_start >= blk_start && ex_start < blk_end) ||
1105 (ex_end > blk_start && ex_end <= blk_end)) {
1106 successors.push(b);
1107 }
1108 DEBUG_ONLY(handler_count++;)
1109 }
1110 }
1111 assert(handler_count > 0, "must find at least one handler");
1112 }
1113 // merge computed variable state with successors
1114 while(successors.length() > 0) {
1115 ciBlock *succ = successors.pop();
1116 merge_block_states(blockstates, succ, &state);
1117 if (!succ->processed())
1118 worklist.push(succ);
1119 }
1120 }
1121 }
1122
1123 bool BCEscapeAnalyzer::do_analysis() {
1124 Arena* arena = CURRENT_ENV->arena();
1125 // identify basic blocks
1126 _methodBlocks = _method->get_method_blocks();
1127
1128 iterate_blocks(arena);
1129 // TEMPORARY
1130 return true;
1131 }
1132
1133 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() {
1134 vmIntrinsics::ID iid = method()->intrinsic_id();
1135
1136 if (iid == vmIntrinsics::_getClass ||
1137 iid == vmIntrinsics::_fillInStackTrace ||
1138 iid == vmIntrinsics::_hashCode)
1139 return iid;
1140 else
1141 return vmIntrinsics::_none;
1142 }
1143
1144 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) {
1145 ArgumentMap arg;
1146 arg.clear();
1147 switch (iid) {
1148 case vmIntrinsics::_getClass:
1149 _return_local = false;
1150 break;
1151 case vmIntrinsics::_fillInStackTrace:
1152 arg.set(0); // 'this'
1153 set_returned(arg);
1154 break;
1155 case vmIntrinsics::_hashCode:
1156 // initialized state is correct
1157 break;
1158 default:
1159 assert(false, "unexpected intrinsic");
1160 }
1161 return true;
1162 }
1163
1164 void BCEscapeAnalyzer::initialize() {
1165 int i;
1166
1167 // clear escape information (method may have been deoptimized)
1168 methodData()->clear_escape_info();
1169
1170 // initialize escape state of object parameters
1171 ciSignature* sig = method()->signature();
1172 int j = 0;
1173 if (!method()->is_static()) {
1174 _arg_local.set(0);
1175 _arg_stack.set(0);
1176 j++;
1177 }
1178 for (i = 0; i < sig->count(); i++) {
1179 ciType* t = sig->type_at(i);
1180 if (!t->is_primitive_type()) {
1181 _arg_local.set(j);
1182 _arg_stack.set(j);
1183 }
1184 j += t->size();
1185 }
1186 assert(j == _arg_size, "just checking");
1187
1188 // start with optimistic assumption
1189 ciType *rt = _method->return_type();
1190 if (rt->is_primitive_type()) {
1191 _return_local = false;
1192 _return_allocated = false;
1193 } else {
1194 _return_local = true;
1195 _return_allocated = true;
1196 }
1197 _allocated_escapes = false;
1198 _unknown_modified = false;
1199 }
1200
1201 void BCEscapeAnalyzer::clear_escape_info() {
1202 ciSignature* sig = method()->signature();
1203 int arg_count = sig->count();
1204 ArgumentMap var;
1205 if (!method()->is_static()) {
1206 arg_count++; // allow for "this"
1207 }
1208 for (int i = 0; i < arg_count; i++) {
1209 set_arg_modified(i, OFFSET_ANY, 4);
1210 var.clear();
1211 var.set(i);
1212 set_modified(var, OFFSET_ANY, 4);
1213 set_global_escape(var);
1214 }
1215 _arg_local.Clear();
1216 _arg_stack.Clear();
1217 _arg_returned.Clear();
1218 _return_local = false;
1219 _return_allocated = false;
1220 _allocated_escapes = true;
1221 _unknown_modified = true;
1222 }
1223
1224
1225 void BCEscapeAnalyzer::compute_escape_info() {
1226 int i;
1227 assert(!methodData()->has_escape_info(), "do not overwrite escape info");
1228
1229 vmIntrinsics::ID iid = known_intrinsic();
1230
1231 // check if method can be analyzed
1232 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized()
1233 || _level > MaxBCEAEstimateLevel
1234 || method()->code_size() > MaxBCEAEstimateSize)) {
1235 if (BCEATraceLevel >= 1) {
1236 tty->print("Skipping method because: ");
1237 if (method()->is_abstract())
1238 tty->print_cr("method is abstract.");
1239 else if (method()->is_native())
1240 tty->print_cr("method is native.");
1241 else if (!method()->holder()->is_initialized())
1242 tty->print_cr("class of method is not initialized.");
1243 else if (_level > MaxBCEAEstimateLevel)
1244 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).",
1245 _level, MaxBCEAEstimateLevel);
1246 else if (method()->code_size() > MaxBCEAEstimateSize)
1247 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.",
1248 method()->code_size(), MaxBCEAEstimateSize);
1249 else
1250 ShouldNotReachHere();
1251 }
1252 clear_escape_info();
1253
1254 return;
1255 }
1256
1257 if (BCEATraceLevel >= 1) {
1258 tty->print("[EA] estimating escape information for");
1259 if (iid != vmIntrinsics::_none)
1260 tty->print(" intrinsic");
1261 method()->print_short_name();
1262 tty->print_cr(" (%d bytes)", method()->code_size());
1263 }
1264
1265 bool success;
1266
1267 initialize();
1268
1269 // Do not scan method if it has no object parameters and
1270 // does not returns an object (_return_allocated is set in initialize()).
1271 if (_arg_local.Size() == 0 && !_return_allocated) {
1272 // Clear all info since method's bytecode was not analysed and
1273 // set pessimistic escape information.
1274 clear_escape_info();
1275 methodData()->set_eflag(methodDataOopDesc::allocated_escapes);
1276 methodData()->set_eflag(methodDataOopDesc::unknown_modified);
1277 methodData()->set_eflag(methodDataOopDesc::estimated);
1278 return;
1279 }
1280
1281 if (iid != vmIntrinsics::_none)
1282 success = compute_escape_for_intrinsic(iid);
1283 else {
1284 success = do_analysis();
1285 }
1286
1287 // don't store interprocedural escape information if it introduces
1288 // dependencies or if method data is empty
1289 //
1290 if (!has_dependencies() && !methodData()->is_empty()) {
1291 for (i = 0; i < _arg_size; i++) {
1292 if (_arg_local.test(i)) {
1293 assert(_arg_stack.test(i), "inconsistent escape info");
1294 methodData()->set_arg_local(i);
1295 methodData()->set_arg_stack(i);
1296 } else if (_arg_stack.test(i)) {
1297 methodData()->set_arg_stack(i);
1298 }
1299 if (_arg_returned.test(i)) {
1300 methodData()->set_arg_returned(i);
1301 }
1302 methodData()->set_arg_modified(i, _arg_modified[i]);
1303 }
1304 if (_return_local) {
1305 methodData()->set_eflag(methodDataOopDesc::return_local);
1306 }
1307 if (_return_allocated) {
1308 methodData()->set_eflag(methodDataOopDesc::return_allocated);
1309 }
1310 if (_allocated_escapes) {
1311 methodData()->set_eflag(methodDataOopDesc::allocated_escapes);
1312 }
1313 if (_unknown_modified) {
1314 methodData()->set_eflag(methodDataOopDesc::unknown_modified);
1315 }
1316 methodData()->set_eflag(methodDataOopDesc::estimated);
1317 }
1318 }
1319
1320 void BCEscapeAnalyzer::read_escape_info() {
1321 assert(methodData()->has_escape_info(), "no escape info available");
1322
1323 // read escape information from method descriptor
1324 for (int i = 0; i < _arg_size; i++) {
1325 if (methodData()->is_arg_local(i))
1326 _arg_local.set(i);
1327 if (methodData()->is_arg_stack(i))
1328 _arg_stack.set(i);
1329 if (methodData()->is_arg_returned(i))
1330 _arg_returned.set(i);
1331 _arg_modified[i] = methodData()->arg_modified(i);
1332 }
1333 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local);
1334 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated);
1335 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes);
1336 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified);
1337
1338 }
1339
1340 #ifndef PRODUCT
1341 void BCEscapeAnalyzer::dump() {
1342 tty->print("[EA] estimated escape information for");
1343 method()->print_short_name();
1344 tty->print_cr(has_dependencies() ? " (not stored)" : "");
1345 tty->print(" non-escaping args: ");
1346 _arg_local.print_on(tty);
1347 tty->print(" stack-allocatable args: ");
1348 _arg_stack.print_on(tty);
1349 if (_return_local) {
1350 tty->print(" returned args: ");
1351 _arg_returned.print_on(tty);
1352 } else if (is_return_allocated()) {
1353 tty->print_cr(" return allocated value");
1354 } else {
1355 tty->print_cr(" return non-local value");
1356 }
1357 tty->print(" modified args: ");
1358 for (int i = 0; i < _arg_size; i++) {
1359 if (_arg_modified[i] == 0)
1360 tty->print(" 0");
1361 else
1362 tty->print(" 0x%x", _arg_modified[i]);
1363 }
1364 tty->cr();
1365 tty->print(" flags: ");
1366 if (_return_allocated)
1367 tty->print(" return_allocated");
1368 if (_allocated_escapes)
1369 tty->print(" allocated_escapes");
1370 if (_unknown_modified)
1371 tty->print(" unknown_modified");
1372 tty->cr();
1373 }
1374 #endif
1375
1376 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent)
1377 : _conservative(method == NULL || !EstimateArgEscape)
1378 , _arena(CURRENT_ENV->arena())
1379 , _method(method)
1380 , _methodData(method ? method->method_data() : NULL)
1381 , _arg_size(method ? method->arg_size() : 0)
1382 , _arg_local(_arena)
1383 , _arg_stack(_arena)
1384 , _arg_returned(_arena)
1385 , _dirty(_arena)
1386 , _return_local(false)
1387 , _return_allocated(false)
1388 , _allocated_escapes(false)
1389 , _unknown_modified(false)
1390 , _dependencies(_arena, 4, 0, NULL)
1391 , _parent(parent)
1392 , _level(parent == NULL ? 0 : parent->level() + 1) {
1393 if (!_conservative) {
1394 _arg_local.Clear();
1395 _arg_stack.Clear();
1396 _arg_returned.Clear();
1397 _dirty.Clear();
1398 Arena* arena = CURRENT_ENV->arena();
1399 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint));
1400 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint));
1401
1402 if (methodData() == NULL)
1403 return;
1404 bool printit = _method->should_print_assembly();
1405 if (methodData()->has_escape_info()) {
1406 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s",
1407 method->holder()->name()->as_utf8(),
1408 method->name()->as_utf8()));
1409 read_escape_info();
1410 } else {
1411 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s",
1412 method->holder()->name()->as_utf8(),
1413 method->name()->as_utf8()));
1414
1415 compute_escape_info();
1416 methodData()->update_escape_info();
1417 }
1418 #ifndef PRODUCT
1419 if (BCEATraceLevel >= 3) {
1420 // dump escape information
1421 dump();
1422 }
1423 #endif
1424 }
1425 }
1426
1427 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) {
1428 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) {
1429 // Also record evol dependencies so redefinition of the
1430 // callee will trigger recompilation.
1431 deps->assert_evol_method(method());
1432 }
1433 for (int i = 0; i < _dependencies.length(); i+=2) {
1434 ciKlass *k = _dependencies.at(i)->as_klass();
1435 ciMethod *m = _dependencies.at(i+1)->as_method();
1436 deps->assert_unique_concrete_method(k, m);
1437 }
1438 }