Mercurial > hg > graal-compiler
comparison src/share/vm/ci/bcEscapeAnalyzer.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 48a3fa21394b |
comparison
equal
deleted
inserted
replaced
-1:000000000000 | 0:a61af66fc99e |
---|---|
1 /* | |
2 * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 | |
26 #include "incls/_precompiled.incl" | |
27 #include "incls/_bcEscapeAnalyzer.cpp.incl" | |
28 | |
29 | |
30 #ifndef PRODUCT | |
31 #define TRACE_BCEA(level, code) \ | |
32 if (EstimateArgEscape && BCEATraceLevel >= level) { \ | |
33 code; \ | |
34 } | |
35 #else | |
36 #define TRACE_BCEA(level, code) | |
37 #endif | |
38 | |
39 // Maintain a map of which aguments a local variable or | |
40 // stack slot may contain. In addition to tracking | |
41 // arguments, it tracks two special values, "allocated" | |
42 // which represents any object allocated in the current | |
43 // method, and "unknown" which is any other object. | |
44 // Up to 30 arguments are handled, with the last one | |
45 // representing summary information for any extra arguments | |
46 class BCEscapeAnalyzer::ArgumentMap { | |
47 uint _bits; | |
48 enum {MAXBIT = 29, | |
49 ALLOCATED = 1, | |
50 UNKNOWN = 2}; | |
51 | |
52 uint int_to_bit(uint e) const { | |
53 if (e > MAXBIT) | |
54 e = MAXBIT; | |
55 return (1 << (e + 2)); | |
56 } | |
57 | |
58 public: | |
59 ArgumentMap() { _bits = 0;} | |
60 void set_bits(uint bits) { _bits = bits;} | |
61 uint get_bits() const { return _bits;} | |
62 void clear() { _bits = 0;} | |
63 void set_all() { _bits = ~0u; } | |
64 bool is_empty() const { return _bits == 0; } | |
65 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } | |
66 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } | |
67 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } | |
68 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } | |
69 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } | |
70 void set(uint var) { _bits = int_to_bit(var); } | |
71 void add(uint var) { _bits |= int_to_bit(var); } | |
72 void add_unknown() { _bits = UNKNOWN; } | |
73 void add_allocated() { _bits = ALLOCATED; } | |
74 void set_union(const ArgumentMap &am) { _bits |= am._bits; } | |
75 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } | |
76 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } | |
77 void operator=(const ArgumentMap &am) { _bits = am._bits; } | |
78 bool operator==(const ArgumentMap &am) { return _bits == am._bits; } | |
79 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } | |
80 }; | |
81 | |
82 class BCEscapeAnalyzer::StateInfo { | |
83 public: | |
84 ArgumentMap *_vars; | |
85 ArgumentMap *_stack; | |
86 short _stack_height; | |
87 short _max_stack; | |
88 bool _initialized; | |
89 ArgumentMap empty_map; | |
90 | |
91 StateInfo() { | |
92 empty_map.clear(); | |
93 } | |
94 | |
95 ArgumentMap raw_pop() { assert(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } | |
96 ArgumentMap apop() { return raw_pop(); } | |
97 void spop() { raw_pop(); } | |
98 void lpop() { spop(); spop(); } | |
99 void raw_push(ArgumentMap i) { assert(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } | |
100 void apush(ArgumentMap i) { raw_push(i); } | |
101 void spush() { raw_push(empty_map); } | |
102 void lpush() { spush(); spush(); } | |
103 | |
104 }; | |
105 | |
106 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) { | |
107 for (int i = 0; i <= _arg_size; i++) { | |
108 if (vars.contains(i)) | |
109 _arg_returned.set_bit(i); | |
110 } | |
111 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); | |
112 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); | |
113 } | |
114 | |
115 | |
116 // return true if any element of vars is an argument | |
117 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { | |
118 for (int i = 0; i <= _arg_size; i++) { | |
119 if (vars.contains(i)) | |
120 return true; | |
121 } | |
122 return false; | |
123 } | |
124 | |
125 // return true if any element of vars is an arg_stack argument | |
126 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ | |
127 if (_conservative) | |
128 return true; | |
129 for (int i = 0; i <= _arg_size; i++) { | |
130 if (vars.contains(i) && _arg_stack.at(i)) | |
131 return true; | |
132 } | |
133 return false; | |
134 } | |
135 | |
136 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, BitMap &bm) { | |
137 for (int i = 0; i <= _arg_size; i++) { | |
138 if (vars.contains(i)) { | |
139 bm.clear_bit(i); | |
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 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { | |
159 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
160 if (scope->method() == callee) { | |
161 return true; | |
162 } | |
163 } | |
164 return false; | |
165 } | |
166 | |
167 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { | |
168 int i; | |
169 | |
170 // retrieve information about the callee | |
171 ciInstanceKlass* klass = target->holder(); | |
172 ciInstanceKlass* calling_klass = method()->holder(); | |
173 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
174 ciInstanceKlass* actual_recv = callee_holder; | |
175 | |
176 // compute size of arguments | |
177 int arg_size = target->arg_size(); | |
178 if (!target->is_loaded() && code == Bytecodes::_invokestatic) { | |
179 arg_size--; | |
180 } | |
181 int arg_base = MAX2(state._stack_height - arg_size, 0); | |
182 | |
183 // direct recursive calls are skipped if they can be bound statically without introducing | |
184 // dependencies and if parameters are passed at the same position as in the current method | |
185 // other calls are skipped if there are no unescaped arguments passed to them | |
186 bool directly_recursive = (method() == target) && | |
187 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
188 | |
189 // check if analysis of callee can safely be skipped | |
190 bool skip_callee = true; | |
191 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
192 ArgumentMap arg = state._stack[i]; | |
193 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
194 } | |
195 if (skip_callee) { | |
196 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
197 for (i = 0; i < arg_size; i++) { | |
198 set_method_escape(state.raw_pop()); | |
199 } | |
200 return; | |
201 } | |
202 | |
203 // determine actual method (use CHA if necessary) | |
204 ciMethod* inline_target = NULL; | |
205 if (target->is_loaded() && klass->is_loaded() | |
206 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
207 && target->will_link(klass, callee_holder, code)) { | |
208 if (code == Bytecodes::_invokestatic | |
209 || code == Bytecodes::_invokespecial | |
210 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
211 inline_target = target; | |
212 } else { | |
213 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
214 } | |
215 } | |
216 | |
217 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
218 // analyze callee | |
219 BCEscapeAnalyzer analyzer(inline_target, this); | |
220 | |
221 // adjust escape state of actual parameters | |
222 bool must_record_dependencies = false; | |
223 for (i = arg_size - 1; i >= 0; i--) { | |
224 ArgumentMap arg = state.raw_pop(); | |
225 if (!is_argument(arg)) | |
226 continue; | |
227 if (!is_arg_stack(arg)) { | |
228 // arguments have already been recognized as escaping | |
229 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
230 set_method_escape(arg); | |
231 must_record_dependencies = true; | |
232 } else { | |
233 set_global_escape(arg); | |
234 } | |
235 } | |
236 | |
237 // record dependencies if at least one parameter retained stack-allocatable | |
238 if (must_record_dependencies) { | |
239 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
240 _dependencies.append(actual_recv); | |
241 _dependencies.append(inline_target); | |
242 } | |
243 _dependencies.appendAll(analyzer.dependencies()); | |
244 } | |
245 } else { | |
246 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
247 target->name()->as_utf8())); | |
248 // conservatively mark all actual parameters as escaping globally | |
249 for (i = 0; i < arg_size; i++) { | |
250 ArgumentMap arg = state.raw_pop(); | |
251 if (!is_argument(arg)) | |
252 continue; | |
253 set_global_escape(arg); | |
254 } | |
255 } | |
256 } | |
257 | |
258 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
259 return ((~arg_set1) | arg_set2) == 0; | |
260 } | |
261 | |
262 | |
263 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
264 | |
265 blk->set_processed(); | |
266 ciBytecodeStream s(method()); | |
267 int limit_bci = blk->limit_bci(); | |
268 bool fall_through = false; | |
269 ArgumentMap allocated_obj; | |
270 allocated_obj.add_allocated(); | |
271 ArgumentMap unknown_obj; | |
272 unknown_obj.add_unknown(); | |
273 ArgumentMap empty_map; | |
274 | |
275 s.reset_to_bci(blk->start_bci()); | |
276 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
277 fall_through = true; | |
278 switch (s.cur_bc()) { | |
279 case Bytecodes::_nop: | |
280 break; | |
281 case Bytecodes::_aconst_null: | |
282 state.apush(empty_map); | |
283 break; | |
284 case Bytecodes::_iconst_m1: | |
285 case Bytecodes::_iconst_0: | |
286 case Bytecodes::_iconst_1: | |
287 case Bytecodes::_iconst_2: | |
288 case Bytecodes::_iconst_3: | |
289 case Bytecodes::_iconst_4: | |
290 case Bytecodes::_iconst_5: | |
291 case Bytecodes::_fconst_0: | |
292 case Bytecodes::_fconst_1: | |
293 case Bytecodes::_fconst_2: | |
294 case Bytecodes::_bipush: | |
295 case Bytecodes::_sipush: | |
296 state.spush(); | |
297 break; | |
298 case Bytecodes::_lconst_0: | |
299 case Bytecodes::_lconst_1: | |
300 case Bytecodes::_dconst_0: | |
301 case Bytecodes::_dconst_1: | |
302 state.lpush(); | |
303 break; | |
304 case Bytecodes::_ldc: | |
305 case Bytecodes::_ldc_w: | |
306 case Bytecodes::_ldc2_w: | |
307 if (type2size[s.get_constant().basic_type()] == 1) { | |
308 state.spush(); | |
309 } else { | |
310 state.lpush(); | |
311 } | |
312 break; | |
313 case Bytecodes::_aload: | |
314 state.apush(state._vars[s.get_index()]); | |
315 break; | |
316 case Bytecodes::_iload: | |
317 case Bytecodes::_fload: | |
318 case Bytecodes::_iload_0: | |
319 case Bytecodes::_iload_1: | |
320 case Bytecodes::_iload_2: | |
321 case Bytecodes::_iload_3: | |
322 case Bytecodes::_fload_0: | |
323 case Bytecodes::_fload_1: | |
324 case Bytecodes::_fload_2: | |
325 case Bytecodes::_fload_3: | |
326 state.spush(); | |
327 break; | |
328 case Bytecodes::_lload: | |
329 case Bytecodes::_dload: | |
330 case Bytecodes::_lload_0: | |
331 case Bytecodes::_lload_1: | |
332 case Bytecodes::_lload_2: | |
333 case Bytecodes::_lload_3: | |
334 case Bytecodes::_dload_0: | |
335 case Bytecodes::_dload_1: | |
336 case Bytecodes::_dload_2: | |
337 case Bytecodes::_dload_3: | |
338 state.lpush(); | |
339 break; | |
340 case Bytecodes::_aload_0: | |
341 state.apush(state._vars[0]); | |
342 break; | |
343 case Bytecodes::_aload_1: | |
344 state.apush(state._vars[1]); | |
345 break; | |
346 case Bytecodes::_aload_2: | |
347 state.apush(state._vars[2]); | |
348 break; | |
349 case Bytecodes::_aload_3: | |
350 state.apush(state._vars[3]); | |
351 break; | |
352 case Bytecodes::_iaload: | |
353 case Bytecodes::_faload: | |
354 case Bytecodes::_baload: | |
355 case Bytecodes::_caload: | |
356 case Bytecodes::_saload: | |
357 state.spop(); | |
358 set_method_escape(state.apop()); | |
359 state.spush(); | |
360 break; | |
361 case Bytecodes::_laload: | |
362 case Bytecodes::_daload: | |
363 state.spop(); | |
364 set_method_escape(state.apop()); | |
365 state.lpush(); | |
366 break; | |
367 case Bytecodes::_aaload: | |
368 { state.spop(); | |
369 ArgumentMap array = state.apop(); | |
370 set_method_escape(array); | |
371 state.apush(unknown_obj); | |
372 set_dirty(array); | |
373 } | |
374 break; | |
375 case Bytecodes::_istore: | |
376 case Bytecodes::_fstore: | |
377 case Bytecodes::_istore_0: | |
378 case Bytecodes::_istore_1: | |
379 case Bytecodes::_istore_2: | |
380 case Bytecodes::_istore_3: | |
381 case Bytecodes::_fstore_0: | |
382 case Bytecodes::_fstore_1: | |
383 case Bytecodes::_fstore_2: | |
384 case Bytecodes::_fstore_3: | |
385 state.spop(); | |
386 break; | |
387 case Bytecodes::_lstore: | |
388 case Bytecodes::_dstore: | |
389 case Bytecodes::_lstore_0: | |
390 case Bytecodes::_lstore_1: | |
391 case Bytecodes::_lstore_2: | |
392 case Bytecodes::_lstore_3: | |
393 case Bytecodes::_dstore_0: | |
394 case Bytecodes::_dstore_1: | |
395 case Bytecodes::_dstore_2: | |
396 case Bytecodes::_dstore_3: | |
397 state.lpop(); | |
398 break; | |
399 case Bytecodes::_astore: | |
400 state._vars[s.get_index()] = state.apop(); | |
401 break; | |
402 case Bytecodes::_astore_0: | |
403 state._vars[0] = state.apop(); | |
404 break; | |
405 case Bytecodes::_astore_1: | |
406 state._vars[1] = state.apop(); | |
407 break; | |
408 case Bytecodes::_astore_2: | |
409 state._vars[2] = state.apop(); | |
410 break; | |
411 case Bytecodes::_astore_3: | |
412 state._vars[3] = state.apop(); | |
413 break; | |
414 case Bytecodes::_iastore: | |
415 case Bytecodes::_fastore: | |
416 case Bytecodes::_bastore: | |
417 case Bytecodes::_castore: | |
418 case Bytecodes::_sastore: | |
419 { | |
420 state.spop(); | |
421 state.spop(); | |
422 ArgumentMap arr = state.apop(); | |
423 set_method_escape(arr); | |
424 break; | |
425 } | |
426 case Bytecodes::_lastore: | |
427 case Bytecodes::_dastore: | |
428 { | |
429 state.lpop(); | |
430 state.spop(); | |
431 ArgumentMap arr = state.apop(); | |
432 set_method_escape(arr); | |
433 break; | |
434 } | |
435 case Bytecodes::_aastore: | |
436 { | |
437 set_global_escape(state.apop()); | |
438 state.spop(); | |
439 ArgumentMap arr = state.apop(); | |
440 break; | |
441 } | |
442 case Bytecodes::_pop: | |
443 state.raw_pop(); | |
444 break; | |
445 case Bytecodes::_pop2: | |
446 state.raw_pop(); | |
447 state.raw_pop(); | |
448 break; | |
449 case Bytecodes::_dup: | |
450 { ArgumentMap w1 = state.raw_pop(); | |
451 state.raw_push(w1); | |
452 state.raw_push(w1); | |
453 } | |
454 break; | |
455 case Bytecodes::_dup_x1: | |
456 { ArgumentMap w1 = state.raw_pop(); | |
457 ArgumentMap w2 = state.raw_pop(); | |
458 state.raw_push(w1); | |
459 state.raw_push(w2); | |
460 state.raw_push(w1); | |
461 } | |
462 break; | |
463 case Bytecodes::_dup_x2: | |
464 { ArgumentMap w1 = state.raw_pop(); | |
465 ArgumentMap w2 = state.raw_pop(); | |
466 ArgumentMap w3 = state.raw_pop(); | |
467 state.raw_push(w1); | |
468 state.raw_push(w3); | |
469 state.raw_push(w2); | |
470 state.raw_push(w1); | |
471 } | |
472 break; | |
473 case Bytecodes::_dup2: | |
474 { ArgumentMap w1 = state.raw_pop(); | |
475 ArgumentMap w2 = state.raw_pop(); | |
476 state.raw_push(w2); | |
477 state.raw_push(w1); | |
478 state.raw_push(w2); | |
479 state.raw_push(w1); | |
480 } | |
481 break; | |
482 case Bytecodes::_dup2_x1: | |
483 { ArgumentMap w1 = state.raw_pop(); | |
484 ArgumentMap w2 = state.raw_pop(); | |
485 ArgumentMap w3 = state.raw_pop(); | |
486 state.raw_push(w2); | |
487 state.raw_push(w1); | |
488 state.raw_push(w3); | |
489 state.raw_push(w2); | |
490 state.raw_push(w1); | |
491 } | |
492 break; | |
493 case Bytecodes::_dup2_x2: | |
494 { ArgumentMap w1 = state.raw_pop(); | |
495 ArgumentMap w2 = state.raw_pop(); | |
496 ArgumentMap w3 = state.raw_pop(); | |
497 ArgumentMap w4 = state.raw_pop(); | |
498 state.raw_push(w2); | |
499 state.raw_push(w1); | |
500 state.raw_push(w4); | |
501 state.raw_push(w3); | |
502 state.raw_push(w2); | |
503 state.raw_push(w1); | |
504 } | |
505 break; | |
506 case Bytecodes::_swap: | |
507 { ArgumentMap w1 = state.raw_pop(); | |
508 ArgumentMap w2 = state.raw_pop(); | |
509 state.raw_push(w1); | |
510 state.raw_push(w2); | |
511 } | |
512 break; | |
513 case Bytecodes::_iadd: | |
514 case Bytecodes::_fadd: | |
515 case Bytecodes::_isub: | |
516 case Bytecodes::_fsub: | |
517 case Bytecodes::_imul: | |
518 case Bytecodes::_fmul: | |
519 case Bytecodes::_idiv: | |
520 case Bytecodes::_fdiv: | |
521 case Bytecodes::_irem: | |
522 case Bytecodes::_frem: | |
523 case Bytecodes::_iand: | |
524 case Bytecodes::_ior: | |
525 case Bytecodes::_ixor: | |
526 state.spop(); | |
527 state.spop(); | |
528 state.spush(); | |
529 break; | |
530 case Bytecodes::_ladd: | |
531 case Bytecodes::_dadd: | |
532 case Bytecodes::_lsub: | |
533 case Bytecodes::_dsub: | |
534 case Bytecodes::_lmul: | |
535 case Bytecodes::_dmul: | |
536 case Bytecodes::_ldiv: | |
537 case Bytecodes::_ddiv: | |
538 case Bytecodes::_lrem: | |
539 case Bytecodes::_drem: | |
540 case Bytecodes::_land: | |
541 case Bytecodes::_lor: | |
542 case Bytecodes::_lxor: | |
543 state.lpop(); | |
544 state.lpop(); | |
545 state.lpush(); | |
546 break; | |
547 case Bytecodes::_ishl: | |
548 case Bytecodes::_ishr: | |
549 case Bytecodes::_iushr: | |
550 state.spop(); | |
551 state.spop(); | |
552 state.spush(); | |
553 break; | |
554 case Bytecodes::_lshl: | |
555 case Bytecodes::_lshr: | |
556 case Bytecodes::_lushr: | |
557 state.spop(); | |
558 state.lpop(); | |
559 state.lpush(); | |
560 break; | |
561 case Bytecodes::_ineg: | |
562 case Bytecodes::_fneg: | |
563 state.spop(); | |
564 state.spush(); | |
565 break; | |
566 case Bytecodes::_lneg: | |
567 case Bytecodes::_dneg: | |
568 state.lpop(); | |
569 state.lpush(); | |
570 break; | |
571 case Bytecodes::_iinc: | |
572 break; | |
573 case Bytecodes::_i2l: | |
574 case Bytecodes::_i2d: | |
575 case Bytecodes::_f2l: | |
576 case Bytecodes::_f2d: | |
577 state.spop(); | |
578 state.lpush(); | |
579 break; | |
580 case Bytecodes::_i2f: | |
581 case Bytecodes::_f2i: | |
582 state.spop(); | |
583 state.spush(); | |
584 break; | |
585 case Bytecodes::_l2i: | |
586 case Bytecodes::_l2f: | |
587 case Bytecodes::_d2i: | |
588 case Bytecodes::_d2f: | |
589 state.lpop(); | |
590 state.spush(); | |
591 break; | |
592 case Bytecodes::_l2d: | |
593 case Bytecodes::_d2l: | |
594 state.lpop(); | |
595 state.lpush(); | |
596 break; | |
597 case Bytecodes::_i2b: | |
598 case Bytecodes::_i2c: | |
599 case Bytecodes::_i2s: | |
600 state.spop(); | |
601 state.spush(); | |
602 break; | |
603 case Bytecodes::_lcmp: | |
604 case Bytecodes::_dcmpl: | |
605 case Bytecodes::_dcmpg: | |
606 state.lpop(); | |
607 state.lpop(); | |
608 state.spush(); | |
609 break; | |
610 case Bytecodes::_fcmpl: | |
611 case Bytecodes::_fcmpg: | |
612 state.spop(); | |
613 state.spop(); | |
614 state.spush(); | |
615 break; | |
616 case Bytecodes::_ifeq: | |
617 case Bytecodes::_ifne: | |
618 case Bytecodes::_iflt: | |
619 case Bytecodes::_ifge: | |
620 case Bytecodes::_ifgt: | |
621 case Bytecodes::_ifle: | |
622 { | |
623 state.spop(); | |
624 int dest_bci = s.get_dest(); | |
625 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
626 assert(s.next_bci() == limit_bci, "branch must end block"); | |
627 successors.push(_methodBlocks->block_containing(dest_bci)); | |
628 break; | |
629 } | |
630 case Bytecodes::_if_icmpeq: | |
631 case Bytecodes::_if_icmpne: | |
632 case Bytecodes::_if_icmplt: | |
633 case Bytecodes::_if_icmpge: | |
634 case Bytecodes::_if_icmpgt: | |
635 case Bytecodes::_if_icmple: | |
636 { | |
637 state.spop(); | |
638 state.spop(); | |
639 int dest_bci = s.get_dest(); | |
640 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
641 assert(s.next_bci() == limit_bci, "branch must end block"); | |
642 successors.push(_methodBlocks->block_containing(dest_bci)); | |
643 break; | |
644 } | |
645 case Bytecodes::_if_acmpeq: | |
646 case Bytecodes::_if_acmpne: | |
647 { | |
648 set_method_escape(state.apop()); | |
649 set_method_escape(state.apop()); | |
650 int dest_bci = s.get_dest(); | |
651 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
652 assert(s.next_bci() == limit_bci, "branch must end block"); | |
653 successors.push(_methodBlocks->block_containing(dest_bci)); | |
654 break; | |
655 } | |
656 case Bytecodes::_goto: | |
657 { | |
658 int dest_bci = s.get_dest(); | |
659 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
660 assert(s.next_bci() == limit_bci, "branch must end block"); | |
661 successors.push(_methodBlocks->block_containing(dest_bci)); | |
662 fall_through = false; | |
663 break; | |
664 } | |
665 case Bytecodes::_jsr: | |
666 { | |
667 int dest_bci = s.get_dest(); | |
668 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
669 assert(s.next_bci() == limit_bci, "branch must end block"); | |
670 state.apush(empty_map); | |
671 successors.push(_methodBlocks->block_containing(dest_bci)); | |
672 fall_through = false; | |
673 break; | |
674 } | |
675 case Bytecodes::_ret: | |
676 // we don't track the destination of a "ret" instruction | |
677 assert(s.next_bci() == limit_bci, "branch must end block"); | |
678 fall_through = false; | |
679 break; | |
680 case Bytecodes::_return: | |
681 assert(s.next_bci() == limit_bci, "return must end block"); | |
682 fall_through = false; | |
683 break; | |
684 case Bytecodes::_tableswitch: | |
685 { | |
686 state.spop(); | |
687 Bytecode_tableswitch* switch_ = Bytecode_tableswitch_at(s.cur_bcp()); | |
688 int len = switch_->length(); | |
689 int dest_bci; | |
690 for (int i = 0; i < len; i++) { | |
691 dest_bci = s.cur_bci() + switch_->dest_offset_at(i); | |
692 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
693 successors.push(_methodBlocks->block_containing(dest_bci)); | |
694 } | |
695 dest_bci = s.cur_bci() + switch_->default_offset(); | |
696 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
697 successors.push(_methodBlocks->block_containing(dest_bci)); | |
698 assert(s.next_bci() == limit_bci, "branch must end block"); | |
699 fall_through = false; | |
700 break; | |
701 } | |
702 case Bytecodes::_lookupswitch: | |
703 { | |
704 state.spop(); | |
705 Bytecode_lookupswitch* switch_ = Bytecode_lookupswitch_at(s.cur_bcp()); | |
706 int len = switch_->number_of_pairs(); | |
707 int dest_bci; | |
708 for (int i = 0; i < len; i++) { | |
709 dest_bci = s.cur_bci() + switch_->pair_at(i)->offset(); | |
710 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
711 successors.push(_methodBlocks->block_containing(dest_bci)); | |
712 } | |
713 dest_bci = s.cur_bci() + switch_->default_offset(); | |
714 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
715 successors.push(_methodBlocks->block_containing(dest_bci)); | |
716 fall_through = false; | |
717 break; | |
718 } | |
719 case Bytecodes::_ireturn: | |
720 case Bytecodes::_freturn: | |
721 state.spop(); | |
722 fall_through = false; | |
723 break; | |
724 case Bytecodes::_lreturn: | |
725 case Bytecodes::_dreturn: | |
726 state.lpop(); | |
727 fall_through = false; | |
728 break; | |
729 case Bytecodes::_areturn: | |
730 set_returned(state.apop()); | |
731 fall_through = false; | |
732 break; | |
733 case Bytecodes::_getstatic: | |
734 case Bytecodes::_getfield: | |
735 { bool will_link; | |
736 ciField* field = s.get_field(will_link); | |
737 BasicType field_type = field->type()->basic_type(); | |
738 if (s.cur_bc() != Bytecodes::_getstatic) { | |
739 set_method_escape(state.apop()); | |
740 } | |
741 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
742 state.apush(unknown_obj); | |
743 } else if (type2size[field_type] == 1) { | |
744 state.spush(); | |
745 } else { | |
746 state.lpush(); | |
747 } | |
748 } | |
749 break; | |
750 case Bytecodes::_putstatic: | |
751 case Bytecodes::_putfield: | |
752 { bool will_link; | |
753 ciField* field = s.get_field(will_link); | |
754 BasicType field_type = field->type()->basic_type(); | |
755 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
756 set_global_escape(state.apop()); | |
757 } else if (type2size[field_type] == 1) { | |
758 state.spop(); | |
759 } else { | |
760 state.lpop(); | |
761 } | |
762 if (s.cur_bc() != Bytecodes::_putstatic) { | |
763 ArgumentMap p = state.apop(); | |
764 set_method_escape(p); | |
765 } | |
766 } | |
767 break; | |
768 case Bytecodes::_invokevirtual: | |
769 case Bytecodes::_invokespecial: | |
770 case Bytecodes::_invokestatic: | |
771 case Bytecodes::_invokeinterface: | |
772 { bool will_link; | |
773 ciMethod* target = s.get_method(will_link); | |
774 ciKlass* holder = s.get_declared_method_holder(); | |
775 invoke(state, s.cur_bc(), target, holder); | |
776 ciType* return_type = target->return_type(); | |
777 if (!return_type->is_primitive_type()) { | |
778 state.apush(unknown_obj); | |
779 } else if (return_type->is_one_word()) { | |
780 state.spush(); | |
781 } else if (return_type->is_two_word()) { | |
782 state.lpush(); | |
783 } | |
784 } | |
785 break; | |
786 case Bytecodes::_xxxunusedxxx: | |
787 ShouldNotReachHere(); | |
788 break; | |
789 case Bytecodes::_new: | |
790 state.apush(allocated_obj); | |
791 break; | |
792 case Bytecodes::_newarray: | |
793 case Bytecodes::_anewarray: | |
794 state.spop(); | |
795 state.apush(allocated_obj); | |
796 break; | |
797 case Bytecodes::_multianewarray: | |
798 { int i = s.cur_bcp()[3]; | |
799 while (i-- > 0) state.spop(); | |
800 state.apush(allocated_obj); | |
801 } | |
802 break; | |
803 case Bytecodes::_arraylength: | |
804 set_method_escape(state.apop()); | |
805 state.spush(); | |
806 break; | |
807 case Bytecodes::_athrow: | |
808 set_global_escape(state.apop()); | |
809 fall_through = false; | |
810 break; | |
811 case Bytecodes::_checkcast: | |
812 { ArgumentMap obj = state.apop(); | |
813 set_method_escape(obj); | |
814 state.apush(obj); | |
815 } | |
816 break; | |
817 case Bytecodes::_instanceof: | |
818 set_method_escape(state.apop()); | |
819 state.spush(); | |
820 break; | |
821 case Bytecodes::_monitorenter: | |
822 case Bytecodes::_monitorexit: | |
823 state.apop(); | |
824 break; | |
825 case Bytecodes::_wide: | |
826 ShouldNotReachHere(); | |
827 break; | |
828 case Bytecodes::_ifnull: | |
829 case Bytecodes::_ifnonnull: | |
830 { | |
831 set_method_escape(state.apop()); | |
832 int dest_bci = s.get_dest(); | |
833 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
834 assert(s.next_bci() == limit_bci, "branch must end block"); | |
835 successors.push(_methodBlocks->block_containing(dest_bci)); | |
836 break; | |
837 } | |
838 case Bytecodes::_goto_w: | |
839 { | |
840 int dest_bci = s.get_far_dest(); | |
841 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
842 assert(s.next_bci() == limit_bci, "branch must end block"); | |
843 successors.push(_methodBlocks->block_containing(dest_bci)); | |
844 fall_through = false; | |
845 break; | |
846 } | |
847 case Bytecodes::_jsr_w: | |
848 { | |
849 int dest_bci = s.get_far_dest(); | |
850 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
851 assert(s.next_bci() == limit_bci, "branch must end block"); | |
852 state.apush(empty_map); | |
853 successors.push(_methodBlocks->block_containing(dest_bci)); | |
854 fall_through = false; | |
855 break; | |
856 } | |
857 case Bytecodes::_breakpoint: | |
858 break; | |
859 default: | |
860 ShouldNotReachHere(); | |
861 break; | |
862 } | |
863 | |
864 } | |
865 if (fall_through) { | |
866 int fall_through_bci = s.cur_bci(); | |
867 if (fall_through_bci < _method->code_size()) { | |
868 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
869 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
870 } | |
871 } | |
872 } | |
873 | |
874 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
875 StateInfo *d_state = blockstates+dest->index(); | |
876 int nlocals = _method->max_locals(); | |
877 | |
878 // exceptions may cause transfer of control to handlers in the middle of a | |
879 // block, so we don't merge the incoming state of exception handlers | |
880 if (dest->is_handler()) | |
881 return; | |
882 if (!d_state->_initialized ) { | |
883 // destination not initialized, just copy | |
884 for (int i = 0; i < nlocals; i++) { | |
885 d_state->_vars[i] = s_state->_vars[i]; | |
886 } | |
887 for (int i = 0; i < s_state->_stack_height; i++) { | |
888 d_state->_stack[i] = s_state->_stack[i]; | |
889 } | |
890 d_state->_stack_height = s_state->_stack_height; | |
891 d_state->_max_stack = s_state->_max_stack; | |
892 d_state->_initialized = true; | |
893 } else if (!dest->processed()) { | |
894 // we have not yet walked the bytecodes of dest, we can merge | |
895 // the states | |
896 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
897 for (int i = 0; i < nlocals; i++) { | |
898 d_state->_vars[i].set_union(s_state->_vars[i]); | |
899 } | |
900 for (int i = 0; i < s_state->_stack_height; i++) { | |
901 d_state->_stack[i].set_union(s_state->_stack[i]); | |
902 } | |
903 } else { | |
904 // the bytecodes of dest have already been processed, mark any | |
905 // arguments in the source state which are not in the dest state | |
906 // as global escape. | |
907 // Future refinement: we only need to mark these variable to the | |
908 // maximum escape of any variables in dest state | |
909 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
910 ArgumentMap extra_vars; | |
911 for (int i = 0; i < nlocals; i++) { | |
912 ArgumentMap t; | |
913 t = s_state->_vars[i]; | |
914 t.set_difference(d_state->_vars[i]); | |
915 extra_vars.set_union(t); | |
916 } | |
917 for (int i = 0; i < s_state->_stack_height; i++) { | |
918 ArgumentMap t; | |
919 t.clear(); | |
920 t = s_state->_stack[i]; | |
921 t.set_difference(d_state->_stack[i]); | |
922 extra_vars.set_union(t); | |
923 } | |
924 set_global_escape(extra_vars); | |
925 } | |
926 } | |
927 | |
928 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
929 int numblocks = _methodBlocks->num_blocks(); | |
930 int stkSize = _method->max_stack(); | |
931 int numLocals = _method->max_locals(); | |
932 StateInfo state; | |
933 | |
934 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
935 int datasize = datacount * sizeof(ArgumentMap); | |
936 StateInfo *blockstates = (StateInfo *) arena->Amalloc(_methodBlocks->num_blocks() * sizeof(StateInfo)); | |
937 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); | |
938 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
939 ArgumentMap *dp = statedata; | |
940 state._vars = dp; | |
941 dp += numLocals; | |
942 state._stack = dp; | |
943 dp += stkSize; | |
944 state._initialized = false; | |
945 state._max_stack = stkSize; | |
946 for (int i = 0; i < numblocks; i++) { | |
947 blockstates[i]._vars = dp; | |
948 dp += numLocals; | |
949 blockstates[i]._stack = dp; | |
950 dp += stkSize; | |
951 blockstates[i]._initialized = false; | |
952 blockstates[i]._stack_height = 0; | |
953 blockstates[i]._max_stack = stkSize; | |
954 } | |
955 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
956 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
957 | |
958 _methodBlocks->clear_processed(); | |
959 | |
960 // initialize block 0 state from method signature | |
961 ArgumentMap allVars; // all oop arguments to method | |
962 ciSignature* sig = method()->signature(); | |
963 int j = 0; | |
964 if (!method()->is_static()) { | |
965 // record information for "this" | |
966 blockstates[0]._vars[j].set(j); | |
967 allVars.add(j); | |
968 j++; | |
969 } | |
970 for (int i = 0; i < sig->count(); i++) { | |
971 ciType* t = sig->type_at(i); | |
972 if (!t->is_primitive_type()) { | |
973 blockstates[0]._vars[j].set(j); | |
974 allVars.add(j); | |
975 } | |
976 j += t->size(); | |
977 } | |
978 blockstates[0]._initialized = true; | |
979 assert(j == _arg_size, "just checking"); | |
980 | |
981 ArgumentMap unknown_map; | |
982 unknown_map.add_unknown(); | |
983 | |
984 worklist.push(_methodBlocks->block_containing(0)); | |
985 while(worklist.length() > 0) { | |
986 ciBlock *blk = worklist.pop(); | |
987 StateInfo *blkState = blockstates+blk->index(); | |
988 if (blk->is_handler() || blk->is_ret_target()) { | |
989 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
990 // that any variable or stack slot could contain any argument | |
991 for (int i = 0; i < numLocals; i++) { | |
992 state._vars[i] = allVars; | |
993 } | |
994 if (blk->is_handler()) { | |
995 state._stack_height = 1; | |
996 } else { | |
997 state._stack_height = blkState->_stack_height; | |
998 } | |
999 for (int i = 0; i < state._stack_height; i++) { | |
1000 state._stack[i] = allVars; | |
1001 } | |
1002 } else { | |
1003 for (int i = 0; i < numLocals; i++) { | |
1004 state._vars[i] = blkState->_vars[i]; | |
1005 } | |
1006 for (int i = 0; i < blkState->_stack_height; i++) { | |
1007 state._stack[i] = blkState->_stack[i]; | |
1008 } | |
1009 state._stack_height = blkState->_stack_height; | |
1010 } | |
1011 iterate_one_block(blk, state, successors); | |
1012 // if this block has any exception handlers, push them | |
1013 // onto successor list | |
1014 if (blk->has_handler()) { | |
1015 DEBUG_ONLY(int handler_count = 0;) | |
1016 int blk_start = blk->start_bci(); | |
1017 int blk_end = blk->limit_bci(); | |
1018 for (int i = 0; i < numblocks; i++) { | |
1019 ciBlock *b = _methodBlocks->block(i); | |
1020 if (b->is_handler()) { | |
1021 int ex_start = b->ex_start_bci(); | |
1022 int ex_end = b->ex_limit_bci(); | |
1023 if ((ex_start >= blk_start && ex_start < blk_end) || | |
1024 (ex_end > blk_start && ex_end <= blk_end)) { | |
1025 successors.push(b); | |
1026 } | |
1027 DEBUG_ONLY(handler_count++;) | |
1028 } | |
1029 } | |
1030 assert(handler_count > 0, "must find at least one handler"); | |
1031 } | |
1032 // merge computed variable state with successors | |
1033 while(successors.length() > 0) { | |
1034 ciBlock *succ = successors.pop(); | |
1035 merge_block_states(blockstates, succ, &state); | |
1036 if (!succ->processed()) | |
1037 worklist.push(succ); | |
1038 } | |
1039 } | |
1040 } | |
1041 | |
1042 bool BCEscapeAnalyzer::do_analysis() { | |
1043 Arena* arena = CURRENT_ENV->arena(); | |
1044 // identify basic blocks | |
1045 _methodBlocks = _method->get_method_blocks(); | |
1046 | |
1047 iterate_blocks(arena); | |
1048 // TEMPORARY | |
1049 return true; | |
1050 } | |
1051 | |
1052 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
1053 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
1054 | |
1055 if (iid == vmIntrinsics::_getClass || | |
1056 iid == vmIntrinsics::_hashCode) | |
1057 return iid; | |
1058 else | |
1059 return vmIntrinsics::_none; | |
1060 } | |
1061 | |
1062 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
1063 ArgumentMap empty; | |
1064 empty.clear(); | |
1065 switch (iid) { | |
1066 case vmIntrinsics::_getClass: | |
1067 _return_local = false; | |
1068 break; | |
1069 case vmIntrinsics::_hashCode: | |
1070 // initialized state is correct | |
1071 break; | |
1072 default: | |
1073 assert(false, "unexpected intrinsic"); | |
1074 } | |
1075 return true; | |
1076 } | |
1077 | |
1078 void BCEscapeAnalyzer::initialize() { | |
1079 int i; | |
1080 | |
1081 // clear escape information (method may have been deoptimized) | |
1082 methodData()->clear_escape_info(); | |
1083 | |
1084 // initialize escape state of object parameters | |
1085 ciSignature* sig = method()->signature(); | |
1086 int j = 0; | |
1087 if (!method()->is_static()) { | |
1088 _arg_local.set_bit(0); | |
1089 _arg_stack.set_bit(0); | |
1090 j++; | |
1091 } | |
1092 for (i = 0; i < sig->count(); i++) { | |
1093 ciType* t = sig->type_at(i); | |
1094 if (!t->is_primitive_type()) { | |
1095 _arg_local.set_bit(j); | |
1096 _arg_stack.set_bit(j); | |
1097 } | |
1098 j += t->size(); | |
1099 } | |
1100 assert(j == _arg_size, "just checking"); | |
1101 | |
1102 // start with optimistic assumption | |
1103 ciType *rt = _method->return_type(); | |
1104 if (rt->is_primitive_type()) { | |
1105 _return_local = false; | |
1106 _return_allocated = false; | |
1107 } else { | |
1108 _return_local = true; | |
1109 _return_allocated = true; | |
1110 } | |
1111 _allocated_escapes = false; | |
1112 } | |
1113 | |
1114 void BCEscapeAnalyzer::clear_escape_info() { | |
1115 ciSignature* sig = method()->signature(); | |
1116 int arg_count = sig->count(); | |
1117 ArgumentMap var; | |
1118 for (int i = 0; i < arg_count; i++) { | |
1119 var.clear(); | |
1120 var.set(i); | |
1121 set_global_escape(var); | |
1122 } | |
1123 _arg_local.clear(); | |
1124 _arg_stack.clear(); | |
1125 _arg_returned.clear(); | |
1126 _return_local = false; | |
1127 _return_allocated = false; | |
1128 _allocated_escapes = true; | |
1129 } | |
1130 | |
1131 | |
1132 void BCEscapeAnalyzer::compute_escape_info() { | |
1133 int i; | |
1134 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
1135 | |
1136 vmIntrinsics::ID iid = known_intrinsic(); | |
1137 | |
1138 // check if method can be analyzed | |
1139 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
1140 || _level > MaxBCEAEstimateLevel | |
1141 || method()->code_size() > MaxBCEAEstimateSize)) { | |
1142 if (BCEATraceLevel >= 1) { | |
1143 tty->print("Skipping method because: "); | |
1144 if (method()->is_abstract()) | |
1145 tty->print_cr("method is abstract."); | |
1146 else if (method()->is_native()) | |
1147 tty->print_cr("method is native."); | |
1148 else if (!method()->holder()->is_initialized()) | |
1149 tty->print_cr("class of method is not initialized."); | |
1150 else if (_level > MaxBCEAEstimateLevel) | |
1151 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
1152 _level, MaxBCEAEstimateLevel); | |
1153 else if (method()->code_size() > MaxBCEAEstimateSize) | |
1154 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
1155 method()->code_size(), MaxBCEAEstimateSize); | |
1156 else | |
1157 ShouldNotReachHere(); | |
1158 } | |
1159 clear_escape_info(); | |
1160 | |
1161 return; | |
1162 } | |
1163 | |
1164 if (BCEATraceLevel >= 1) { | |
1165 tty->print("[EA] estimating escape information for"); | |
1166 if (iid != vmIntrinsics::_none) | |
1167 tty->print(" intrinsic"); | |
1168 method()->print_short_name(); | |
1169 tty->print_cr(" (%d bytes)", method()->code_size()); | |
1170 } | |
1171 | |
1172 bool success; | |
1173 | |
1174 initialize(); | |
1175 | |
1176 // do not scan method if it has no object parameters | |
1177 if (_arg_local.is_empty()) { | |
1178 methodData()->set_eflag(methodDataOopDesc::estimated); | |
1179 return; | |
1180 } | |
1181 | |
1182 if (iid != vmIntrinsics::_none) | |
1183 success = compute_escape_for_intrinsic(iid); | |
1184 else { | |
1185 success = do_analysis(); | |
1186 } | |
1187 | |
1188 // dump result of bytecode analysis | |
1189 #ifndef PRODUCT | |
1190 if (BCEATraceLevel >= 3) { | |
1191 tty->print("[EA] estimated escape information for"); | |
1192 if (iid != vmIntrinsics::_none) | |
1193 tty->print(" intrinsic"); | |
1194 method()->print_short_name(); | |
1195 tty->print_cr(has_dependencies() ? " (not stored)" : ""); | |
1196 tty->print(" non-escaping args: "); | |
1197 _arg_local.print_on(tty); | |
1198 tty->print(" stack-allocatable args: "); | |
1199 _arg_stack.print_on(tty); | |
1200 if (_return_local) { | |
1201 tty->print(" returned args: "); | |
1202 _arg_returned.print_on(tty); | |
1203 } else if (is_return_allocated()) { | |
1204 tty->print_cr(" allocated return values"); | |
1205 } else { | |
1206 tty->print_cr(" non-local return values"); | |
1207 } | |
1208 tty->cr(); | |
1209 tty->print(" flags: "); | |
1210 if (_return_allocated) | |
1211 tty->print(" return_allocated"); | |
1212 tty->cr(); | |
1213 } | |
1214 | |
1215 #endif | |
1216 // don't store interprocedural escape information if it introduces dependencies | |
1217 // or if method data is empty | |
1218 // | |
1219 if (!has_dependencies() && !methodData()->is_empty()) { | |
1220 for (i = 0; i < _arg_size; i++) { | |
1221 if (_arg_local.at(i)) { | |
1222 assert(_arg_stack.at(i), "inconsistent escape info"); | |
1223 methodData()->set_arg_local(i); | |
1224 methodData()->set_arg_stack(i); | |
1225 } else if (_arg_stack.at(i)) { | |
1226 methodData()->set_arg_stack(i); | |
1227 } | |
1228 if (_arg_returned.at(i)) { | |
1229 methodData()->set_arg_returned(i); | |
1230 } | |
1231 } | |
1232 if (_return_local) { | |
1233 methodData()->set_eflag(methodDataOopDesc::return_local); | |
1234 } | |
1235 methodData()->set_eflag(methodDataOopDesc::estimated); | |
1236 } | |
1237 } | |
1238 | |
1239 void BCEscapeAnalyzer::read_escape_info() { | |
1240 assert(methodData()->has_escape_info(), "no escape info available"); | |
1241 | |
1242 // read escape information from method descriptor | |
1243 for (int i = 0; i < _arg_size; i++) { | |
1244 _arg_local.at_put(i, methodData()->is_arg_local(i)); | |
1245 _arg_stack.at_put(i, methodData()->is_arg_stack(i)); | |
1246 _arg_returned.at_put(i, methodData()->is_arg_returned(i)); | |
1247 } | |
1248 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local); | |
1249 | |
1250 // dump result of loaded escape information | |
1251 #ifndef PRODUCT | |
1252 if (BCEATraceLevel >= 4) { | |
1253 tty->print(" non-escaping args: "); | |
1254 _arg_local.print_on(tty); | |
1255 tty->print(" stack-allocatable args: "); | |
1256 _arg_stack.print_on(tty); | |
1257 if (_return_local) { | |
1258 tty->print(" returned args: "); | |
1259 _arg_returned.print_on(tty); | |
1260 } else { | |
1261 tty->print_cr(" non-local return values"); | |
1262 } | |
1263 tty->print(" modified args: "); | |
1264 tty->cr(); | |
1265 } | |
1266 #endif | |
1267 | |
1268 } | |
1269 | |
1270 | |
1271 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
1272 : _conservative(method == NULL || !EstimateArgEscape) | |
1273 , _method(method) | |
1274 , _methodData(method ? method->method_data() : NULL) | |
1275 , _arg_size(method ? method->arg_size() : 0) | |
1276 , _stack() | |
1277 , _arg_local(_arg_size) | |
1278 , _arg_stack(_arg_size) | |
1279 , _arg_returned(_arg_size) | |
1280 , _dirty(_arg_size) | |
1281 , _return_local(false) | |
1282 , _return_allocated(false) | |
1283 , _allocated_escapes(false) | |
1284 , _dependencies() | |
1285 , _parent(parent) | |
1286 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
1287 if (!_conservative) { | |
1288 _arg_local.clear(); | |
1289 _arg_stack.clear(); | |
1290 _arg_returned.clear(); | |
1291 _dirty.clear(); | |
1292 Arena* arena = CURRENT_ENV->arena(); | |
1293 | |
1294 if (methodData() == NULL) | |
1295 return; | |
1296 bool printit = _method->should_print_assembly(); | |
1297 if (methodData()->has_escape_info()) { | |
1298 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
1299 method->holder()->name()->as_utf8(), | |
1300 method->name()->as_utf8())); | |
1301 read_escape_info(); | |
1302 } else { | |
1303 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
1304 method->holder()->name()->as_utf8(), | |
1305 method->name()->as_utf8())); | |
1306 | |
1307 compute_escape_info(); | |
1308 methodData()->update_escape_info(); | |
1309 } | |
1310 } | |
1311 } | |
1312 | |
1313 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
1314 if(!has_dependencies()) | |
1315 return; | |
1316 for (int i = 0; i < _dependencies.length(); i+=2) { | |
1317 ciKlass *k = _dependencies[i]->as_klass(); | |
1318 ciMethod *m = _dependencies[i+1]->as_method(); | |
1319 deps->assert_unique_concrete_method(k, m); | |
1320 } | |
1321 } |