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