Mercurial > hg > truffle
comparison src/share/vm/c1/c1_Instruction.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 3cf667df43ef |
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1 /* | |
2 * Copyright 1999-2006 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 #include "incls/_precompiled.incl" | |
26 #include "incls/_c1_Instruction.cpp.incl" | |
27 | |
28 | |
29 // Implementation of Instruction | |
30 | |
31 | |
32 int Instruction::_next_id = 0; | |
33 | |
34 #ifdef ASSERT | |
35 void Instruction::create_hi_word() { | |
36 assert(type()->is_double_word() && _hi_word == NULL, "only double word has high word"); | |
37 _hi_word = new HiWord(this); | |
38 } | |
39 #endif | |
40 | |
41 Instruction::Condition Instruction::mirror(Condition cond) { | |
42 switch (cond) { | |
43 case eql: return eql; | |
44 case neq: return neq; | |
45 case lss: return gtr; | |
46 case leq: return geq; | |
47 case gtr: return lss; | |
48 case geq: return leq; | |
49 } | |
50 ShouldNotReachHere(); | |
51 return eql; | |
52 } | |
53 | |
54 | |
55 Instruction::Condition Instruction::negate(Condition cond) { | |
56 switch (cond) { | |
57 case eql: return neq; | |
58 case neq: return eql; | |
59 case lss: return geq; | |
60 case leq: return gtr; | |
61 case gtr: return leq; | |
62 case geq: return lss; | |
63 } | |
64 ShouldNotReachHere(); | |
65 return eql; | |
66 } | |
67 | |
68 | |
69 Instruction* Instruction::prev(BlockBegin* block) { | |
70 Instruction* p = NULL; | |
71 Instruction* q = block; | |
72 while (q != this) { | |
73 assert(q != NULL, "this is not in the block's instruction list"); | |
74 p = q; q = q->next(); | |
75 } | |
76 return p; | |
77 } | |
78 | |
79 | |
80 #ifndef PRODUCT | |
81 void Instruction::print() { | |
82 InstructionPrinter ip; | |
83 print(ip); | |
84 } | |
85 | |
86 | |
87 void Instruction::print_line() { | |
88 InstructionPrinter ip; | |
89 ip.print_line(this); | |
90 } | |
91 | |
92 | |
93 void Instruction::print(InstructionPrinter& ip) { | |
94 ip.print_head(); | |
95 ip.print_line(this); | |
96 tty->cr(); | |
97 } | |
98 #endif // PRODUCT | |
99 | |
100 | |
101 // perform constant and interval tests on index value | |
102 bool AccessIndexed::compute_needs_range_check() { | |
103 Constant* clength = length()->as_Constant(); | |
104 Constant* cindex = index()->as_Constant(); | |
105 if (clength && cindex) { | |
106 IntConstant* l = clength->type()->as_IntConstant(); | |
107 IntConstant* i = cindex->type()->as_IntConstant(); | |
108 if (l && i && i->value() < l->value() && i->value() >= 0) { | |
109 return false; | |
110 } | |
111 } | |
112 return true; | |
113 } | |
114 | |
115 | |
116 ciType* LoadIndexed::exact_type() const { | |
117 ciType* array_type = array()->exact_type(); | |
118 if (array_type == NULL) { | |
119 return NULL; | |
120 } | |
121 assert(array_type->is_array_klass(), "what else?"); | |
122 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
123 | |
124 if (ak->element_type()->is_instance_klass()) { | |
125 ciInstanceKlass* ik = (ciInstanceKlass*)ak->element_type(); | |
126 if (ik->is_loaded() && ik->is_final()) { | |
127 return ik; | |
128 } | |
129 } | |
130 return NULL; | |
131 } | |
132 | |
133 | |
134 ciType* LoadIndexed::declared_type() const { | |
135 ciType* array_type = array()->declared_type(); | |
136 if (array_type == NULL) { | |
137 return NULL; | |
138 } | |
139 assert(array_type->is_array_klass(), "what else?"); | |
140 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
141 return ak->element_type(); | |
142 } | |
143 | |
144 | |
145 ciType* LoadField::declared_type() const { | |
146 return field()->type(); | |
147 } | |
148 | |
149 | |
150 ciType* LoadField::exact_type() const { | |
151 ciType* type = declared_type(); | |
152 // for primitive arrays, the declared type is the exact type | |
153 if (type->is_type_array_klass()) { | |
154 return type; | |
155 } | |
156 if (type->is_instance_klass()) { | |
157 ciInstanceKlass* ik = (ciInstanceKlass*)type; | |
158 if (ik->is_loaded() && ik->is_final()) { | |
159 return type; | |
160 } | |
161 } | |
162 return NULL; | |
163 } | |
164 | |
165 | |
166 ciType* NewTypeArray::exact_type() const { | |
167 return ciTypeArrayKlass::make(elt_type()); | |
168 } | |
169 | |
170 | |
171 ciType* NewObjectArray::exact_type() const { | |
172 return ciObjArrayKlass::make(klass()); | |
173 } | |
174 | |
175 | |
176 ciType* NewInstance::exact_type() const { | |
177 return klass(); | |
178 } | |
179 | |
180 | |
181 ciType* CheckCast::declared_type() const { | |
182 return klass(); | |
183 } | |
184 | |
185 ciType* CheckCast::exact_type() const { | |
186 if (klass()->is_instance_klass()) { | |
187 ciInstanceKlass* ik = (ciInstanceKlass*)klass(); | |
188 if (ik->is_loaded() && ik->is_final()) { | |
189 return ik; | |
190 } | |
191 } | |
192 return NULL; | |
193 } | |
194 | |
195 | |
196 void ArithmeticOp::other_values_do(void f(Value*)) { | |
197 if (lock_stack() != NULL) lock_stack()->values_do(f); | |
198 } | |
199 | |
200 void NullCheck::other_values_do(void f(Value*)) { | |
201 lock_stack()->values_do(f); | |
202 } | |
203 | |
204 void AccessArray::other_values_do(void f(Value*)) { | |
205 if (lock_stack() != NULL) lock_stack()->values_do(f); | |
206 } | |
207 | |
208 | |
209 // Implementation of AccessField | |
210 | |
211 void AccessField::other_values_do(void f(Value*)) { | |
212 if (state_before() != NULL) state_before()->values_do(f); | |
213 if (lock_stack() != NULL) lock_stack()->values_do(f); | |
214 } | |
215 | |
216 | |
217 // Implementation of StoreIndexed | |
218 | |
219 IRScope* StoreIndexed::scope() const { | |
220 return lock_stack()->scope(); | |
221 } | |
222 | |
223 | |
224 // Implementation of ArithmeticOp | |
225 | |
226 bool ArithmeticOp::is_commutative() const { | |
227 switch (op()) { | |
228 case Bytecodes::_iadd: // fall through | |
229 case Bytecodes::_ladd: // fall through | |
230 case Bytecodes::_fadd: // fall through | |
231 case Bytecodes::_dadd: // fall through | |
232 case Bytecodes::_imul: // fall through | |
233 case Bytecodes::_lmul: // fall through | |
234 case Bytecodes::_fmul: // fall through | |
235 case Bytecodes::_dmul: return true; | |
236 } | |
237 return false; | |
238 } | |
239 | |
240 | |
241 bool ArithmeticOp::can_trap() const { | |
242 switch (op()) { | |
243 case Bytecodes::_idiv: // fall through | |
244 case Bytecodes::_ldiv: // fall through | |
245 case Bytecodes::_irem: // fall through | |
246 case Bytecodes::_lrem: return true; | |
247 } | |
248 return false; | |
249 } | |
250 | |
251 | |
252 // Implementation of LogicOp | |
253 | |
254 bool LogicOp::is_commutative() const { | |
255 #ifdef ASSERT | |
256 switch (op()) { | |
257 case Bytecodes::_iand: // fall through | |
258 case Bytecodes::_land: // fall through | |
259 case Bytecodes::_ior : // fall through | |
260 case Bytecodes::_lor : // fall through | |
261 case Bytecodes::_ixor: // fall through | |
262 case Bytecodes::_lxor: break; | |
263 default : ShouldNotReachHere(); | |
264 } | |
265 #endif | |
266 // all LogicOps are commutative | |
267 return true; | |
268 } | |
269 | |
270 | |
271 // Implementation of CompareOp | |
272 | |
273 void CompareOp::other_values_do(void f(Value*)) { | |
274 if (state_before() != NULL) state_before()->values_do(f); | |
275 } | |
276 | |
277 | |
278 // Implementation of IfOp | |
279 | |
280 bool IfOp::is_commutative() const { | |
281 return cond() == eql || cond() == neq; | |
282 } | |
283 | |
284 | |
285 // Implementation of StateSplit | |
286 | |
287 void StateSplit::substitute(BlockList& list, BlockBegin* old_block, BlockBegin* new_block) { | |
288 NOT_PRODUCT(bool assigned = false;) | |
289 for (int i = 0; i < list.length(); i++) { | |
290 BlockBegin** b = list.adr_at(i); | |
291 if (*b == old_block) { | |
292 *b = new_block; | |
293 NOT_PRODUCT(assigned = true;) | |
294 } | |
295 } | |
296 assert(assigned == true, "should have assigned at least once"); | |
297 } | |
298 | |
299 | |
300 IRScope* StateSplit::scope() const { | |
301 return _state->scope(); | |
302 } | |
303 | |
304 | |
305 void StateSplit::state_values_do(void f(Value*)) { | |
306 if (state() != NULL) state()->values_do(f); | |
307 } | |
308 | |
309 | |
310 void BlockBegin::state_values_do(void f(Value*)) { | |
311 StateSplit::state_values_do(f); | |
312 | |
313 if (is_set(BlockBegin::exception_entry_flag)) { | |
314 for (int i = 0; i < number_of_exception_states(); i++) { | |
315 exception_state_at(i)->values_do(f); | |
316 } | |
317 } | |
318 } | |
319 | |
320 | |
321 void MonitorEnter::state_values_do(void f(Value*)) { | |
322 StateSplit::state_values_do(f); | |
323 _lock_stack_before->values_do(f); | |
324 } | |
325 | |
326 | |
327 void Intrinsic::state_values_do(void f(Value*)) { | |
328 StateSplit::state_values_do(f); | |
329 if (lock_stack() != NULL) lock_stack()->values_do(f); | |
330 } | |
331 | |
332 | |
333 // Implementation of Invoke | |
334 | |
335 | |
336 Invoke::Invoke(Bytecodes::Code code, ValueType* result_type, Value recv, Values* args, | |
337 int vtable_index, ciMethod* target) | |
338 : StateSplit(result_type) | |
339 , _code(code) | |
340 , _recv(recv) | |
341 , _args(args) | |
342 , _vtable_index(vtable_index) | |
343 , _target(target) | |
344 { | |
345 set_flag(TargetIsLoadedFlag, target->is_loaded()); | |
346 set_flag(TargetIsFinalFlag, target_is_loaded() && target->is_final_method()); | |
347 set_flag(TargetIsStrictfpFlag, target_is_loaded() && target->is_strict()); | |
348 | |
349 assert(args != NULL, "args must exist"); | |
350 #ifdef ASSERT | |
351 values_do(assert_value); | |
352 #endif // ASSERT | |
353 | |
354 // provide an initial guess of signature size. | |
355 _signature = new BasicTypeList(number_of_arguments() + (has_receiver() ? 1 : 0)); | |
356 if (has_receiver()) { | |
357 _signature->append(as_BasicType(receiver()->type())); | |
358 } | |
359 for (int i = 0; i < number_of_arguments(); i++) { | |
360 ValueType* t = argument_at(i)->type(); | |
361 BasicType bt = as_BasicType(t); | |
362 _signature->append(bt); | |
363 } | |
364 } | |
365 | |
366 | |
367 // Implementation of Contant | |
368 intx Constant::hash() const { | |
369 if (_state == NULL) { | |
370 switch (type()->tag()) { | |
371 case intTag: | |
372 return HASH2(name(), type()->as_IntConstant()->value()); | |
373 case longTag: | |
374 { | |
375 jlong temp = type()->as_LongConstant()->value(); | |
376 return HASH3(name(), high(temp), low(temp)); | |
377 } | |
378 case floatTag: | |
379 return HASH2(name(), jint_cast(type()->as_FloatConstant()->value())); | |
380 case doubleTag: | |
381 { | |
382 jlong temp = jlong_cast(type()->as_DoubleConstant()->value()); | |
383 return HASH3(name(), high(temp), low(temp)); | |
384 } | |
385 case objectTag: | |
386 assert(type()->as_ObjectType()->is_loaded(), "can't handle unloaded values"); | |
387 return HASH2(name(), type()->as_ObjectType()->constant_value()); | |
388 } | |
389 } | |
390 return 0; | |
391 } | |
392 | |
393 bool Constant::is_equal(Value v) const { | |
394 if (v->as_Constant() == NULL) return false; | |
395 | |
396 switch (type()->tag()) { | |
397 case intTag: | |
398 { | |
399 IntConstant* t1 = type()->as_IntConstant(); | |
400 IntConstant* t2 = v->type()->as_IntConstant(); | |
401 return (t1 != NULL && t2 != NULL && | |
402 t1->value() == t2->value()); | |
403 } | |
404 case longTag: | |
405 { | |
406 LongConstant* t1 = type()->as_LongConstant(); | |
407 LongConstant* t2 = v->type()->as_LongConstant(); | |
408 return (t1 != NULL && t2 != NULL && | |
409 t1->value() == t2->value()); | |
410 } | |
411 case floatTag: | |
412 { | |
413 FloatConstant* t1 = type()->as_FloatConstant(); | |
414 FloatConstant* t2 = v->type()->as_FloatConstant(); | |
415 return (t1 != NULL && t2 != NULL && | |
416 jint_cast(t1->value()) == jint_cast(t2->value())); | |
417 } | |
418 case doubleTag: | |
419 { | |
420 DoubleConstant* t1 = type()->as_DoubleConstant(); | |
421 DoubleConstant* t2 = v->type()->as_DoubleConstant(); | |
422 return (t1 != NULL && t2 != NULL && | |
423 jlong_cast(t1->value()) == jlong_cast(t2->value())); | |
424 } | |
425 case objectTag: | |
426 { | |
427 ObjectType* t1 = type()->as_ObjectType(); | |
428 ObjectType* t2 = v->type()->as_ObjectType(); | |
429 return (t1 != NULL && t2 != NULL && | |
430 t1->is_loaded() && t2->is_loaded() && | |
431 t1->constant_value() == t2->constant_value()); | |
432 } | |
433 } | |
434 return false; | |
435 } | |
436 | |
437 | |
438 BlockBegin* Constant::compare(Instruction::Condition cond, Value right, | |
439 BlockBegin* true_sux, BlockBegin* false_sux) { | |
440 Constant* rc = right->as_Constant(); | |
441 // other is not a constant | |
442 if (rc == NULL) return NULL; | |
443 | |
444 ValueType* lt = type(); | |
445 ValueType* rt = rc->type(); | |
446 // different types | |
447 if (lt->base() != rt->base()) return NULL; | |
448 switch (lt->tag()) { | |
449 case intTag: { | |
450 int x = lt->as_IntConstant()->value(); | |
451 int y = rt->as_IntConstant()->value(); | |
452 switch (cond) { | |
453 case If::eql: return x == y ? true_sux : false_sux; | |
454 case If::neq: return x != y ? true_sux : false_sux; | |
455 case If::lss: return x < y ? true_sux : false_sux; | |
456 case If::leq: return x <= y ? true_sux : false_sux; | |
457 case If::gtr: return x > y ? true_sux : false_sux; | |
458 case If::geq: return x >= y ? true_sux : false_sux; | |
459 } | |
460 break; | |
461 } | |
462 case longTag: { | |
463 jlong x = lt->as_LongConstant()->value(); | |
464 jlong y = rt->as_LongConstant()->value(); | |
465 switch (cond) { | |
466 case If::eql: return x == y ? true_sux : false_sux; | |
467 case If::neq: return x != y ? true_sux : false_sux; | |
468 case If::lss: return x < y ? true_sux : false_sux; | |
469 case If::leq: return x <= y ? true_sux : false_sux; | |
470 case If::gtr: return x > y ? true_sux : false_sux; | |
471 case If::geq: return x >= y ? true_sux : false_sux; | |
472 } | |
473 break; | |
474 } | |
475 case objectTag: { | |
476 ciObject* xvalue = lt->as_ObjectType()->constant_value(); | |
477 ciObject* yvalue = rt->as_ObjectType()->constant_value(); | |
478 assert(xvalue != NULL && yvalue != NULL, "not constants"); | |
479 if (xvalue->is_loaded() && yvalue->is_loaded()) { | |
480 switch (cond) { | |
481 case If::eql: return xvalue == yvalue ? true_sux : false_sux; | |
482 case If::neq: return xvalue != yvalue ? true_sux : false_sux; | |
483 } | |
484 } | |
485 break; | |
486 } | |
487 } | |
488 return NULL; | |
489 } | |
490 | |
491 | |
492 void Constant::other_values_do(void f(Value*)) { | |
493 if (state() != NULL) state()->values_do(f); | |
494 } | |
495 | |
496 | |
497 // Implementation of NewArray | |
498 | |
499 void NewArray::other_values_do(void f(Value*)) { | |
500 if (state_before() != NULL) state_before()->values_do(f); | |
501 } | |
502 | |
503 | |
504 // Implementation of TypeCheck | |
505 | |
506 void TypeCheck::other_values_do(void f(Value*)) { | |
507 if (state_before() != NULL) state_before()->values_do(f); | |
508 } | |
509 | |
510 | |
511 // Implementation of BlockBegin | |
512 | |
513 int BlockBegin::_next_block_id = 0; | |
514 | |
515 | |
516 void BlockBegin::set_end(BlockEnd* end) { | |
517 assert(end != NULL, "should not reset block end to NULL"); | |
518 BlockEnd* old_end = _end; | |
519 if (end == old_end) { | |
520 return; | |
521 } | |
522 // Must make the predecessors/successors match up with the | |
523 // BlockEnd's notion. | |
524 int i, n; | |
525 if (old_end != NULL) { | |
526 // disconnect from the old end | |
527 old_end->set_begin(NULL); | |
528 | |
529 // disconnect this block from it's current successors | |
530 for (i = 0; i < _successors.length(); i++) { | |
531 _successors.at(i)->remove_predecessor(this); | |
532 } | |
533 } | |
534 _end = end; | |
535 | |
536 _successors.clear(); | |
537 // Now reset successors list based on BlockEnd | |
538 n = end->number_of_sux(); | |
539 for (i = 0; i < n; i++) { | |
540 BlockBegin* sux = end->sux_at(i); | |
541 _successors.append(sux); | |
542 sux->_predecessors.append(this); | |
543 } | |
544 _end->set_begin(this); | |
545 } | |
546 | |
547 | |
548 void BlockBegin::disconnect_edge(BlockBegin* from, BlockBegin* to) { | |
549 // disconnect any edges between from and to | |
550 #ifndef PRODUCT | |
551 if (PrintIR && Verbose) { | |
552 tty->print_cr("Disconnected edge B%d -> B%d", from->block_id(), to->block_id()); | |
553 } | |
554 #endif | |
555 for (int s = 0; s < from->number_of_sux();) { | |
556 BlockBegin* sux = from->sux_at(s); | |
557 if (sux == to) { | |
558 int index = sux->_predecessors.index_of(from); | |
559 if (index >= 0) { | |
560 sux->_predecessors.remove_at(index); | |
561 } | |
562 from->_successors.remove_at(s); | |
563 } else { | |
564 s++; | |
565 } | |
566 } | |
567 } | |
568 | |
569 | |
570 void BlockBegin::disconnect_from_graph() { | |
571 // disconnect this block from all other blocks | |
572 for (int p = 0; p < number_of_preds(); p++) { | |
573 pred_at(p)->remove_successor(this); | |
574 } | |
575 for (int s = 0; s < number_of_sux(); s++) { | |
576 sux_at(s)->remove_predecessor(this); | |
577 } | |
578 } | |
579 | |
580 void BlockBegin::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
581 // modify predecessors before substituting successors | |
582 for (int i = 0; i < number_of_sux(); i++) { | |
583 if (sux_at(i) == old_sux) { | |
584 // remove old predecessor before adding new predecessor | |
585 // otherwise there is a dead predecessor in the list | |
586 new_sux->remove_predecessor(old_sux); | |
587 new_sux->add_predecessor(this); | |
588 } | |
589 } | |
590 old_sux->remove_predecessor(this); | |
591 end()->substitute_sux(old_sux, new_sux); | |
592 } | |
593 | |
594 | |
595 | |
596 // In general it is not possible to calculate a value for the field "depth_first_number" | |
597 // of the inserted block, without recomputing the values of the other blocks | |
598 // in the CFG. Therefore the value of "depth_first_number" in BlockBegin becomes meaningless. | |
599 BlockBegin* BlockBegin::insert_block_between(BlockBegin* sux) { | |
600 // Try to make the bci close to a block with a single pred or sux, | |
601 // since this make the block layout algorithm work better. | |
602 int bci = -1; | |
603 if (sux->number_of_preds() == 1) { | |
604 bci = sux->bci(); | |
605 } else { | |
606 bci = end()->bci(); | |
607 } | |
608 | |
609 BlockBegin* new_sux = new BlockBegin(bci); | |
610 | |
611 // mark this block (special treatment when block order is computed) | |
612 new_sux->set(critical_edge_split_flag); | |
613 | |
614 // This goto is not a safepoint. | |
615 Goto* e = new Goto(sux, false); | |
616 new_sux->set_next(e, bci); | |
617 new_sux->set_end(e); | |
618 // setup states | |
619 ValueStack* s = end()->state(); | |
620 new_sux->set_state(s->copy()); | |
621 e->set_state(s->copy()); | |
622 assert(new_sux->state()->locals_size() == s->locals_size(), "local size mismatch!"); | |
623 assert(new_sux->state()->stack_size() == s->stack_size(), "stack size mismatch!"); | |
624 assert(new_sux->state()->locks_size() == s->locks_size(), "locks size mismatch!"); | |
625 | |
626 // link predecessor to new block | |
627 end()->substitute_sux(sux, new_sux); | |
628 | |
629 // The ordering needs to be the same, so remove the link that the | |
630 // set_end call above added and substitute the new_sux for this | |
631 // block. | |
632 sux->remove_predecessor(new_sux); | |
633 | |
634 // the successor could be the target of a switch so it might have | |
635 // multiple copies of this predecessor, so substitute the new_sux | |
636 // for the first and delete the rest. | |
637 bool assigned = false; | |
638 BlockList& list = sux->_predecessors; | |
639 for (int i = 0; i < list.length(); i++) { | |
640 BlockBegin** b = list.adr_at(i); | |
641 if (*b == this) { | |
642 if (assigned) { | |
643 list.remove_at(i); | |
644 // reprocess this index | |
645 i--; | |
646 } else { | |
647 assigned = true; | |
648 *b = new_sux; | |
649 } | |
650 // link the new block back to it's predecessors. | |
651 new_sux->add_predecessor(this); | |
652 } | |
653 } | |
654 assert(assigned == true, "should have assigned at least once"); | |
655 return new_sux; | |
656 } | |
657 | |
658 | |
659 void BlockBegin::remove_successor(BlockBegin* pred) { | |
660 int idx; | |
661 while ((idx = _successors.index_of(pred)) >= 0) { | |
662 _successors.remove_at(idx); | |
663 } | |
664 } | |
665 | |
666 | |
667 void BlockBegin::add_predecessor(BlockBegin* pred) { | |
668 _predecessors.append(pred); | |
669 } | |
670 | |
671 | |
672 void BlockBegin::remove_predecessor(BlockBegin* pred) { | |
673 int idx; | |
674 while ((idx = _predecessors.index_of(pred)) >= 0) { | |
675 _predecessors.remove_at(idx); | |
676 } | |
677 } | |
678 | |
679 | |
680 void BlockBegin::add_exception_handler(BlockBegin* b) { | |
681 assert(b != NULL && (b->is_set(exception_entry_flag)), "exception handler must exist"); | |
682 // add only if not in the list already | |
683 if (!_exception_handlers.contains(b)) _exception_handlers.append(b); | |
684 } | |
685 | |
686 int BlockBegin::add_exception_state(ValueStack* state) { | |
687 assert(is_set(exception_entry_flag), "only for xhandlers"); | |
688 if (_exception_states == NULL) { | |
689 _exception_states = new ValueStackStack(4); | |
690 } | |
691 _exception_states->append(state); | |
692 return _exception_states->length() - 1; | |
693 } | |
694 | |
695 | |
696 void BlockBegin::iterate_preorder(boolArray& mark, BlockClosure* closure) { | |
697 if (!mark.at(block_id())) { | |
698 mark.at_put(block_id(), true); | |
699 closure->block_do(this); | |
700 BlockEnd* e = end(); // must do this after block_do because block_do may change it! | |
701 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_preorder(mark, closure); } | |
702 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_preorder(mark, closure); } | |
703 } | |
704 } | |
705 | |
706 | |
707 void BlockBegin::iterate_postorder(boolArray& mark, BlockClosure* closure) { | |
708 if (!mark.at(block_id())) { | |
709 mark.at_put(block_id(), true); | |
710 BlockEnd* e = end(); | |
711 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_postorder(mark, closure); } | |
712 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_postorder(mark, closure); } | |
713 closure->block_do(this); | |
714 } | |
715 } | |
716 | |
717 | |
718 void BlockBegin::iterate_preorder(BlockClosure* closure) { | |
719 boolArray mark(number_of_blocks(), false); | |
720 iterate_preorder(mark, closure); | |
721 } | |
722 | |
723 | |
724 void BlockBegin::iterate_postorder(BlockClosure* closure) { | |
725 boolArray mark(number_of_blocks(), false); | |
726 iterate_postorder(mark, closure); | |
727 } | |
728 | |
729 | |
730 void BlockBegin::block_values_do(void f(Value*)) { | |
731 for (Instruction* n = this; n != NULL; n = n->next()) n->values_do(f); | |
732 } | |
733 | |
734 | |
735 #ifndef PRODUCT | |
736 #define TRACE_PHI(code) if (PrintPhiFunctions) { code; } | |
737 #else | |
738 #define TRACE_PHI(coce) | |
739 #endif | |
740 | |
741 | |
742 bool BlockBegin::try_merge(ValueStack* new_state) { | |
743 TRACE_PHI(tty->print_cr("********** try_merge for block B%d", block_id())); | |
744 | |
745 // local variables used for state iteration | |
746 int index; | |
747 Value new_value, existing_value; | |
748 | |
749 ValueStack* existing_state = state(); | |
750 if (existing_state == NULL) { | |
751 TRACE_PHI(tty->print_cr("first call of try_merge for this block")); | |
752 | |
753 if (is_set(BlockBegin::was_visited_flag)) { | |
754 // this actually happens for complicated jsr/ret structures | |
755 return false; // BAILOUT in caller | |
756 } | |
757 | |
758 // copy state because it is altered | |
759 new_state = new_state->copy(); | |
760 | |
761 // Use method liveness to invalidate dead locals | |
762 MethodLivenessResult liveness = new_state->scope()->method()->liveness_at_bci(bci()); | |
763 if (liveness.is_valid()) { | |
764 assert((int)liveness.size() == new_state->locals_size(), "error in use of liveness"); | |
765 | |
766 for_each_local_value(new_state, index, new_value) { | |
767 if (!liveness.at(index) || new_value->type()->is_illegal()) { | |
768 new_state->invalidate_local(index); | |
769 TRACE_PHI(tty->print_cr("invalidating dead local %d", index)); | |
770 } | |
771 } | |
772 } | |
773 | |
774 if (is_set(BlockBegin::parser_loop_header_flag)) { | |
775 TRACE_PHI(tty->print_cr("loop header block, initializing phi functions")); | |
776 | |
777 for_each_stack_value(new_state, index, new_value) { | |
778 new_state->setup_phi_for_stack(this, index); | |
779 TRACE_PHI(tty->print_cr("creating phi-function %c%d for stack %d", new_state->stack_at(index)->type()->tchar(), new_state->stack_at(index)->id(), index)); | |
780 } | |
781 | |
782 BitMap requires_phi_function = new_state->scope()->requires_phi_function(); | |
783 | |
784 for_each_local_value(new_state, index, new_value) { | |
785 bool requires_phi = requires_phi_function.at(index) || (new_value->type()->is_double_word() && requires_phi_function.at(index + 1)); | |
786 if (requires_phi || !SelectivePhiFunctions) { | |
787 new_state->setup_phi_for_local(this, index); | |
788 TRACE_PHI(tty->print_cr("creating phi-function %c%d for local %d", new_state->local_at(index)->type()->tchar(), new_state->local_at(index)->id(), index)); | |
789 } | |
790 } | |
791 } | |
792 | |
793 // initialize state of block | |
794 set_state(new_state); | |
795 | |
796 } else if (existing_state->is_same_across_scopes(new_state)) { | |
797 TRACE_PHI(tty->print_cr("exisiting state found")); | |
798 | |
799 // Inlining may cause the local state not to match up, so walk up | |
800 // the new state until we get to the same scope as the | |
801 // existing and then start processing from there. | |
802 while (existing_state->scope() != new_state->scope()) { | |
803 new_state = new_state->caller_state(); | |
804 assert(new_state != NULL, "could not match up scopes"); | |
805 | |
806 assert(false, "check if this is necessary"); | |
807 } | |
808 | |
809 assert(existing_state->scope() == new_state->scope(), "not matching"); | |
810 assert(existing_state->locals_size() == new_state->locals_size(), "not matching"); | |
811 assert(existing_state->stack_size() == new_state->stack_size(), "not matching"); | |
812 | |
813 if (is_set(BlockBegin::was_visited_flag)) { | |
814 TRACE_PHI(tty->print_cr("loop header block, phis must be present")); | |
815 | |
816 if (!is_set(BlockBegin::parser_loop_header_flag)) { | |
817 // this actually happens for complicated jsr/ret structures | |
818 return false; // BAILOUT in caller | |
819 } | |
820 | |
821 for_each_local_value(existing_state, index, existing_value) { | |
822 Value new_value = new_state->local_at(index); | |
823 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
824 // The old code invalidated the phi function here | |
825 // Because dead locals are replaced with NULL, this is a very rare case now, so simply bail out | |
826 return false; // BAILOUT in caller | |
827 } | |
828 } | |
829 | |
830 #ifdef ASSERT | |
831 // check that all necessary phi functions are present | |
832 for_each_stack_value(existing_state, index, existing_value) { | |
833 assert(existing_value->as_Phi() != NULL && existing_value->as_Phi()->block() == this, "phi function required"); | |
834 } | |
835 for_each_local_value(existing_state, index, existing_value) { | |
836 assert(existing_value == new_state->local_at(index) || (existing_value->as_Phi() != NULL && existing_value->as_Phi()->as_Phi()->block() == this), "phi function required"); | |
837 } | |
838 #endif | |
839 | |
840 } else { | |
841 TRACE_PHI(tty->print_cr("creating phi functions on demand")); | |
842 | |
843 // create necessary phi functions for stack | |
844 for_each_stack_value(existing_state, index, existing_value) { | |
845 Value new_value = new_state->stack_at(index); | |
846 Phi* existing_phi = existing_value->as_Phi(); | |
847 | |
848 if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
849 existing_state->setup_phi_for_stack(this, index); | |
850 TRACE_PHI(tty->print_cr("creating phi-function %c%d for stack %d", existing_state->stack_at(index)->type()->tchar(), existing_state->stack_at(index)->id(), index)); | |
851 } | |
852 } | |
853 | |
854 // create necessary phi functions for locals | |
855 for_each_local_value(existing_state, index, existing_value) { | |
856 Value new_value = new_state->local_at(index); | |
857 Phi* existing_phi = existing_value->as_Phi(); | |
858 | |
859 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
860 existing_state->invalidate_local(index); | |
861 TRACE_PHI(tty->print_cr("invalidating local %d because of type mismatch", index)); | |
862 } else if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
863 existing_state->setup_phi_for_local(this, index); | |
864 TRACE_PHI(tty->print_cr("creating phi-function %c%d for local %d", existing_state->local_at(index)->type()->tchar(), existing_state->local_at(index)->id(), index)); | |
865 } | |
866 } | |
867 } | |
868 | |
869 assert(existing_state->caller_state() == new_state->caller_state(), "caller states must be equal"); | |
870 | |
871 } else { | |
872 assert(false, "stack or locks not matching (invalid bytecodes)"); | |
873 return false; | |
874 } | |
875 | |
876 TRACE_PHI(tty->print_cr("********** try_merge for block B%d successful", block_id())); | |
877 | |
878 return true; | |
879 } | |
880 | |
881 | |
882 #ifndef PRODUCT | |
883 void BlockBegin::print_block() { | |
884 InstructionPrinter ip; | |
885 print_block(ip, false); | |
886 } | |
887 | |
888 | |
889 void BlockBegin::print_block(InstructionPrinter& ip, bool live_only) { | |
890 ip.print_instr(this); tty->cr(); | |
891 ip.print_stack(this->state()); tty->cr(); | |
892 ip.print_inline_level(this); | |
893 ip.print_head(); | |
894 for (Instruction* n = next(); n != NULL; n = n->next()) { | |
895 if (!live_only || n->is_pinned() || n->use_count() > 0) { | |
896 ip.print_line(n); | |
897 } | |
898 } | |
899 tty->cr(); | |
900 } | |
901 #endif // PRODUCT | |
902 | |
903 | |
904 // Implementation of BlockList | |
905 | |
906 void BlockList::iterate_forward (BlockClosure* closure) { | |
907 const int l = length(); | |
908 for (int i = 0; i < l; i++) closure->block_do(at(i)); | |
909 } | |
910 | |
911 | |
912 void BlockList::iterate_backward(BlockClosure* closure) { | |
913 for (int i = length() - 1; i >= 0; i--) closure->block_do(at(i)); | |
914 } | |
915 | |
916 | |
917 void BlockList::blocks_do(void f(BlockBegin*)) { | |
918 for (int i = length() - 1; i >= 0; i--) f(at(i)); | |
919 } | |
920 | |
921 | |
922 void BlockList::values_do(void f(Value*)) { | |
923 for (int i = length() - 1; i >= 0; i--) at(i)->block_values_do(f); | |
924 } | |
925 | |
926 | |
927 #ifndef PRODUCT | |
928 void BlockList::print(bool cfg_only, bool live_only) { | |
929 InstructionPrinter ip; | |
930 for (int i = 0; i < length(); i++) { | |
931 BlockBegin* block = at(i); | |
932 if (cfg_only) { | |
933 ip.print_instr(block); tty->cr(); | |
934 } else { | |
935 block->print_block(ip, live_only); | |
936 } | |
937 } | |
938 } | |
939 #endif // PRODUCT | |
940 | |
941 | |
942 // Implementation of BlockEnd | |
943 | |
944 void BlockEnd::set_begin(BlockBegin* begin) { | |
945 BlockList* sux = NULL; | |
946 if (begin != NULL) { | |
947 sux = begin->successors(); | |
948 } else if (_begin != NULL) { | |
949 // copy our sux list | |
950 BlockList* sux = new BlockList(_begin->number_of_sux()); | |
951 for (int i = 0; i < _begin->number_of_sux(); i++) { | |
952 sux->append(_begin->sux_at(i)); | |
953 } | |
954 } | |
955 _sux = sux; | |
956 _begin = begin; | |
957 } | |
958 | |
959 | |
960 void BlockEnd::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
961 substitute(*_sux, old_sux, new_sux); | |
962 } | |
963 | |
964 | |
965 void BlockEnd::other_values_do(void f(Value*)) { | |
966 if (state_before() != NULL) state_before()->values_do(f); | |
967 } | |
968 | |
969 | |
970 // Implementation of Phi | |
971 | |
972 // Normal phi functions take their operands from the last instruction of the | |
973 // predecessor. Special handling is needed for xhanlder entries because there | |
974 // the state of arbitrary instructions are needed. | |
975 | |
976 Value Phi::operand_at(int i) const { | |
977 ValueStack* state; | |
978 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
979 state = _block->exception_state_at(i); | |
980 } else { | |
981 state = _block->pred_at(i)->end()->state(); | |
982 } | |
983 assert(state != NULL, ""); | |
984 | |
985 if (is_local()) { | |
986 return state->local_at(local_index()); | |
987 } else { | |
988 return state->stack_at(stack_index()); | |
989 } | |
990 } | |
991 | |
992 | |
993 int Phi::operand_count() const { | |
994 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
995 return _block->number_of_exception_states(); | |
996 } else { | |
997 return _block->number_of_preds(); | |
998 } | |
999 } | |
1000 | |
1001 | |
1002 // Implementation of Throw | |
1003 | |
1004 void Throw::state_values_do(void f(Value*)) { | |
1005 BlockEnd::state_values_do(f); | |
1006 } |