Mercurial > hg > truffle
annotate src/share/vm/c1/c1_Instruction.cpp @ 4048:cec1757a0134
7102657: JSR 292: C1 deoptimizes unlinked invokedynamic call sites infinitely
Reviewed-by: never, bdelsart
author | twisti |
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date | Thu, 27 Oct 2011 04:43:37 -0700 |
parents | a32de5085326 |
children | 1d7922586cf6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "c1/c1_IR.hpp" | |
27 #include "c1/c1_Instruction.hpp" | |
28 #include "c1/c1_InstructionPrinter.hpp" | |
29 #include "c1/c1_ValueStack.hpp" | |
30 #include "ci/ciObjArrayKlass.hpp" | |
31 #include "ci/ciTypeArrayKlass.hpp" | |
0 | 32 |
33 | |
34 // Implementation of Instruction | |
35 | |
36 | |
37 Instruction::Condition Instruction::mirror(Condition cond) { | |
38 switch (cond) { | |
39 case eql: return eql; | |
40 case neq: return neq; | |
41 case lss: return gtr; | |
42 case leq: return geq; | |
43 case gtr: return lss; | |
44 case geq: return leq; | |
45 } | |
46 ShouldNotReachHere(); | |
47 return eql; | |
48 } | |
49 | |
50 | |
51 Instruction::Condition Instruction::negate(Condition cond) { | |
52 switch (cond) { | |
53 case eql: return neq; | |
54 case neq: return eql; | |
55 case lss: return geq; | |
56 case leq: return gtr; | |
57 case gtr: return leq; | |
58 case geq: return lss; | |
59 } | |
60 ShouldNotReachHere(); | |
61 return eql; | |
62 } | |
63 | |
1819 | 64 void Instruction::update_exception_state(ValueStack* state) { |
65 if (state != NULL && (state->kind() == ValueStack::EmptyExceptionState || state->kind() == ValueStack::ExceptionState)) { | |
66 assert(state->kind() == ValueStack::EmptyExceptionState || Compilation::current()->env()->jvmti_can_access_local_variables(), "unexpected state kind"); | |
67 _exception_state = state; | |
68 } else { | |
69 _exception_state = NULL; | |
70 } | |
71 } | |
72 | |
0 | 73 |
74 Instruction* Instruction::prev(BlockBegin* block) { | |
75 Instruction* p = NULL; | |
76 Instruction* q = block; | |
77 while (q != this) { | |
78 assert(q != NULL, "this is not in the block's instruction list"); | |
79 p = q; q = q->next(); | |
80 } | |
81 return p; | |
82 } | |
83 | |
84 | |
1819 | 85 void Instruction::state_values_do(ValueVisitor* f) { |
86 if (state_before() != NULL) { | |
87 state_before()->values_do(f); | |
88 } | |
89 if (exception_state() != NULL){ | |
90 exception_state()->values_do(f); | |
91 } | |
92 } | |
93 | |
94 | |
0 | 95 #ifndef PRODUCT |
1819 | 96 void Instruction::check_state(ValueStack* state) { |
97 if (state != NULL) { | |
98 state->verify(); | |
99 } | |
100 } | |
101 | |
102 | |
0 | 103 void Instruction::print() { |
104 InstructionPrinter ip; | |
105 print(ip); | |
106 } | |
107 | |
108 | |
109 void Instruction::print_line() { | |
110 InstructionPrinter ip; | |
111 ip.print_line(this); | |
112 } | |
113 | |
114 | |
115 void Instruction::print(InstructionPrinter& ip) { | |
116 ip.print_head(); | |
117 ip.print_line(this); | |
118 tty->cr(); | |
119 } | |
120 #endif // PRODUCT | |
121 | |
122 | |
123 // perform constant and interval tests on index value | |
124 bool AccessIndexed::compute_needs_range_check() { | |
125 Constant* clength = length()->as_Constant(); | |
126 Constant* cindex = index()->as_Constant(); | |
127 if (clength && cindex) { | |
128 IntConstant* l = clength->type()->as_IntConstant(); | |
129 IntConstant* i = cindex->type()->as_IntConstant(); | |
130 if (l && i && i->value() < l->value() && i->value() >= 0) { | |
131 return false; | |
132 } | |
133 } | |
134 return true; | |
135 } | |
136 | |
137 | |
2446 | 138 ciType* Local::exact_type() const { |
139 ciType* type = declared_type(); | |
140 | |
141 // for primitive arrays, the declared type is the exact type | |
142 if (type->is_type_array_klass()) { | |
143 return type; | |
144 } else if (type->is_instance_klass()) { | |
145 ciInstanceKlass* ik = (ciInstanceKlass*)type; | |
146 if (ik->is_loaded() && ik->is_final() && !ik->is_interface()) { | |
147 return type; | |
148 } | |
149 } else if (type->is_obj_array_klass()) { | |
150 ciObjArrayKlass* oak = (ciObjArrayKlass*)type; | |
151 ciType* base = oak->base_element_type(); | |
152 if (base->is_instance_klass()) { | |
153 ciInstanceKlass* ik = base->as_instance_klass(); | |
154 if (ik->is_loaded() && ik->is_final()) { | |
155 return type; | |
156 } | |
157 } else if (base->is_primitive_type()) { | |
158 return type; | |
159 } | |
160 } | |
161 return NULL; | |
162 } | |
163 | |
164 | |
0 | 165 ciType* LoadIndexed::exact_type() const { |
166 ciType* array_type = array()->exact_type(); | |
167 if (array_type == NULL) { | |
168 return NULL; | |
169 } | |
170 assert(array_type->is_array_klass(), "what else?"); | |
171 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
172 | |
173 if (ak->element_type()->is_instance_klass()) { | |
174 ciInstanceKlass* ik = (ciInstanceKlass*)ak->element_type(); | |
175 if (ik->is_loaded() && ik->is_final()) { | |
176 return ik; | |
177 } | |
178 } | |
179 return NULL; | |
180 } | |
181 | |
182 | |
183 ciType* LoadIndexed::declared_type() const { | |
184 ciType* array_type = array()->declared_type(); | |
185 if (array_type == NULL) { | |
186 return NULL; | |
187 } | |
188 assert(array_type->is_array_klass(), "what else?"); | |
189 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
190 return ak->element_type(); | |
191 } | |
192 | |
193 | |
194 ciType* LoadField::declared_type() const { | |
195 return field()->type(); | |
196 } | |
197 | |
198 | |
199 ciType* LoadField::exact_type() const { | |
200 ciType* type = declared_type(); | |
201 // for primitive arrays, the declared type is the exact type | |
202 if (type->is_type_array_klass()) { | |
203 return type; | |
204 } | |
205 if (type->is_instance_klass()) { | |
206 ciInstanceKlass* ik = (ciInstanceKlass*)type; | |
207 if (ik->is_loaded() && ik->is_final()) { | |
208 return type; | |
209 } | |
210 } | |
211 return NULL; | |
212 } | |
213 | |
214 | |
215 ciType* NewTypeArray::exact_type() const { | |
216 return ciTypeArrayKlass::make(elt_type()); | |
217 } | |
218 | |
219 ciType* NewObjectArray::exact_type() const { | |
220 return ciObjArrayKlass::make(klass()); | |
221 } | |
222 | |
2446 | 223 ciType* NewArray::declared_type() const { |
224 return exact_type(); | |
225 } | |
0 | 226 |
227 ciType* NewInstance::exact_type() const { | |
228 return klass(); | |
229 } | |
230 | |
2446 | 231 ciType* NewInstance::declared_type() const { |
232 return exact_type(); | |
233 } | |
0 | 234 |
235 ciType* CheckCast::declared_type() const { | |
236 return klass(); | |
237 } | |
238 | |
239 ciType* CheckCast::exact_type() const { | |
240 if (klass()->is_instance_klass()) { | |
241 ciInstanceKlass* ik = (ciInstanceKlass*)klass(); | |
242 if (ik->is_loaded() && ik->is_final()) { | |
243 return ik; | |
244 } | |
245 } | |
246 return NULL; | |
247 } | |
248 | |
249 // Implementation of ArithmeticOp | |
250 | |
251 bool ArithmeticOp::is_commutative() const { | |
252 switch (op()) { | |
253 case Bytecodes::_iadd: // fall through | |
254 case Bytecodes::_ladd: // fall through | |
255 case Bytecodes::_fadd: // fall through | |
256 case Bytecodes::_dadd: // fall through | |
257 case Bytecodes::_imul: // fall through | |
258 case Bytecodes::_lmul: // fall through | |
259 case Bytecodes::_fmul: // fall through | |
260 case Bytecodes::_dmul: return true; | |
261 } | |
262 return false; | |
263 } | |
264 | |
265 | |
266 bool ArithmeticOp::can_trap() const { | |
267 switch (op()) { | |
268 case Bytecodes::_idiv: // fall through | |
269 case Bytecodes::_ldiv: // fall through | |
270 case Bytecodes::_irem: // fall through | |
271 case Bytecodes::_lrem: return true; | |
272 } | |
273 return false; | |
274 } | |
275 | |
276 | |
277 // Implementation of LogicOp | |
278 | |
279 bool LogicOp::is_commutative() const { | |
280 #ifdef ASSERT | |
281 switch (op()) { | |
282 case Bytecodes::_iand: // fall through | |
283 case Bytecodes::_land: // fall through | |
284 case Bytecodes::_ior : // fall through | |
285 case Bytecodes::_lor : // fall through | |
286 case Bytecodes::_ixor: // fall through | |
287 case Bytecodes::_lxor: break; | |
288 default : ShouldNotReachHere(); | |
289 } | |
290 #endif | |
291 // all LogicOps are commutative | |
292 return true; | |
293 } | |
294 | |
295 | |
296 // Implementation of IfOp | |
297 | |
298 bool IfOp::is_commutative() const { | |
299 return cond() == eql || cond() == neq; | |
300 } | |
301 | |
302 | |
303 // Implementation of StateSplit | |
304 | |
305 void StateSplit::substitute(BlockList& list, BlockBegin* old_block, BlockBegin* new_block) { | |
306 NOT_PRODUCT(bool assigned = false;) | |
307 for (int i = 0; i < list.length(); i++) { | |
308 BlockBegin** b = list.adr_at(i); | |
309 if (*b == old_block) { | |
310 *b = new_block; | |
311 NOT_PRODUCT(assigned = true;) | |
312 } | |
313 } | |
314 assert(assigned == true, "should have assigned at least once"); | |
315 } | |
316 | |
317 | |
318 IRScope* StateSplit::scope() const { | |
319 return _state->scope(); | |
320 } | |
321 | |
322 | |
1584 | 323 void StateSplit::state_values_do(ValueVisitor* f) { |
1819 | 324 Instruction::state_values_do(f); |
0 | 325 if (state() != NULL) state()->values_do(f); |
326 } | |
327 | |
328 | |
1584 | 329 void BlockBegin::state_values_do(ValueVisitor* f) { |
0 | 330 StateSplit::state_values_do(f); |
331 | |
332 if (is_set(BlockBegin::exception_entry_flag)) { | |
333 for (int i = 0; i < number_of_exception_states(); i++) { | |
334 exception_state_at(i)->values_do(f); | |
335 } | |
336 } | |
337 } | |
338 | |
339 | |
340 // Implementation of Invoke | |
341 | |
342 | |
343 Invoke::Invoke(Bytecodes::Code code, ValueType* result_type, Value recv, Values* args, | |
1295 | 344 int vtable_index, ciMethod* target, ValueStack* state_before) |
1819 | 345 : StateSplit(result_type, state_before) |
0 | 346 , _code(code) |
347 , _recv(recv) | |
348 , _args(args) | |
349 , _vtable_index(vtable_index) | |
350 , _target(target) | |
351 { | |
352 set_flag(TargetIsLoadedFlag, target->is_loaded()); | |
353 set_flag(TargetIsFinalFlag, target_is_loaded() && target->is_final_method()); | |
354 set_flag(TargetIsStrictfpFlag, target_is_loaded() && target->is_strict()); | |
355 | |
356 assert(args != NULL, "args must exist"); | |
357 #ifdef ASSERT | |
1584 | 358 AssertValues assert_value; |
359 values_do(&assert_value); | |
360 #endif | |
0 | 361 |
362 // provide an initial guess of signature size. | |
363 _signature = new BasicTypeList(number_of_arguments() + (has_receiver() ? 1 : 0)); | |
364 if (has_receiver()) { | |
365 _signature->append(as_BasicType(receiver()->type())); | |
1295 | 366 } else if (is_invokedynamic()) { |
367 // Add the synthetic MethodHandle argument to the signature. | |
368 _signature->append(T_OBJECT); | |
0 | 369 } |
370 for (int i = 0; i < number_of_arguments(); i++) { | |
371 ValueType* t = argument_at(i)->type(); | |
372 BasicType bt = as_BasicType(t); | |
373 _signature->append(bt); | |
374 } | |
375 } | |
376 | |
377 | |
1584 | 378 void Invoke::state_values_do(ValueVisitor* f) { |
1295 | 379 StateSplit::state_values_do(f); |
380 if (state_before() != NULL) state_before()->values_do(f); | |
381 if (state() != NULL) state()->values_do(f); | |
382 } | |
383 | |
2446 | 384 ciType* Invoke::declared_type() const { |
385 ciType *t = _target->signature()->return_type(); | |
386 assert(t->basic_type() != T_VOID, "need return value of void method?"); | |
387 return t; | |
388 } | |
1295 | 389 |
0 | 390 // Implementation of Contant |
391 intx Constant::hash() const { | |
1819 | 392 if (state_before() == NULL) { |
0 | 393 switch (type()->tag()) { |
394 case intTag: | |
395 return HASH2(name(), type()->as_IntConstant()->value()); | |
396 case longTag: | |
397 { | |
398 jlong temp = type()->as_LongConstant()->value(); | |
399 return HASH3(name(), high(temp), low(temp)); | |
400 } | |
401 case floatTag: | |
402 return HASH2(name(), jint_cast(type()->as_FloatConstant()->value())); | |
403 case doubleTag: | |
404 { | |
405 jlong temp = jlong_cast(type()->as_DoubleConstant()->value()); | |
406 return HASH3(name(), high(temp), low(temp)); | |
407 } | |
408 case objectTag: | |
409 assert(type()->as_ObjectType()->is_loaded(), "can't handle unloaded values"); | |
410 return HASH2(name(), type()->as_ObjectType()->constant_value()); | |
411 } | |
412 } | |
413 return 0; | |
414 } | |
415 | |
416 bool Constant::is_equal(Value v) const { | |
417 if (v->as_Constant() == NULL) return false; | |
418 | |
419 switch (type()->tag()) { | |
420 case intTag: | |
421 { | |
422 IntConstant* t1 = type()->as_IntConstant(); | |
423 IntConstant* t2 = v->type()->as_IntConstant(); | |
424 return (t1 != NULL && t2 != NULL && | |
425 t1->value() == t2->value()); | |
426 } | |
427 case longTag: | |
428 { | |
429 LongConstant* t1 = type()->as_LongConstant(); | |
430 LongConstant* t2 = v->type()->as_LongConstant(); | |
431 return (t1 != NULL && t2 != NULL && | |
432 t1->value() == t2->value()); | |
433 } | |
434 case floatTag: | |
435 { | |
436 FloatConstant* t1 = type()->as_FloatConstant(); | |
437 FloatConstant* t2 = v->type()->as_FloatConstant(); | |
438 return (t1 != NULL && t2 != NULL && | |
439 jint_cast(t1->value()) == jint_cast(t2->value())); | |
440 } | |
441 case doubleTag: | |
442 { | |
443 DoubleConstant* t1 = type()->as_DoubleConstant(); | |
444 DoubleConstant* t2 = v->type()->as_DoubleConstant(); | |
445 return (t1 != NULL && t2 != NULL && | |
446 jlong_cast(t1->value()) == jlong_cast(t2->value())); | |
447 } | |
448 case objectTag: | |
449 { | |
450 ObjectType* t1 = type()->as_ObjectType(); | |
451 ObjectType* t2 = v->type()->as_ObjectType(); | |
452 return (t1 != NULL && t2 != NULL && | |
453 t1->is_loaded() && t2->is_loaded() && | |
454 t1->constant_value() == t2->constant_value()); | |
455 } | |
456 } | |
457 return false; | |
458 } | |
459 | |
1899 | 460 Constant::CompareResult Constant::compare(Instruction::Condition cond, Value right) const { |
0 | 461 Constant* rc = right->as_Constant(); |
462 // other is not a constant | |
1899 | 463 if (rc == NULL) return not_comparable; |
0 | 464 |
465 ValueType* lt = type(); | |
466 ValueType* rt = rc->type(); | |
467 // different types | |
1899 | 468 if (lt->base() != rt->base()) return not_comparable; |
0 | 469 switch (lt->tag()) { |
470 case intTag: { | |
471 int x = lt->as_IntConstant()->value(); | |
472 int y = rt->as_IntConstant()->value(); | |
473 switch (cond) { | |
1899 | 474 case If::eql: return x == y ? cond_true : cond_false; |
475 case If::neq: return x != y ? cond_true : cond_false; | |
476 case If::lss: return x < y ? cond_true : cond_false; | |
477 case If::leq: return x <= y ? cond_true : cond_false; | |
478 case If::gtr: return x > y ? cond_true : cond_false; | |
479 case If::geq: return x >= y ? cond_true : cond_false; | |
0 | 480 } |
481 break; | |
482 } | |
483 case longTag: { | |
484 jlong x = lt->as_LongConstant()->value(); | |
485 jlong y = rt->as_LongConstant()->value(); | |
486 switch (cond) { | |
1899 | 487 case If::eql: return x == y ? cond_true : cond_false; |
488 case If::neq: return x != y ? cond_true : cond_false; | |
489 case If::lss: return x < y ? cond_true : cond_false; | |
490 case If::leq: return x <= y ? cond_true : cond_false; | |
491 case If::gtr: return x > y ? cond_true : cond_false; | |
492 case If::geq: return x >= y ? cond_true : cond_false; | |
0 | 493 } |
494 break; | |
495 } | |
496 case objectTag: { | |
497 ciObject* xvalue = lt->as_ObjectType()->constant_value(); | |
498 ciObject* yvalue = rt->as_ObjectType()->constant_value(); | |
499 assert(xvalue != NULL && yvalue != NULL, "not constants"); | |
500 if (xvalue->is_loaded() && yvalue->is_loaded()) { | |
501 switch (cond) { | |
1899 | 502 case If::eql: return xvalue == yvalue ? cond_true : cond_false; |
503 case If::neq: return xvalue != yvalue ? cond_true : cond_false; | |
0 | 504 } |
505 } | |
506 break; | |
507 } | |
508 } | |
1899 | 509 return not_comparable; |
0 | 510 } |
511 | |
512 | |
513 // Implementation of BlockBegin | |
514 | |
515 void BlockBegin::set_end(BlockEnd* end) { | |
516 assert(end != NULL, "should not reset block end to NULL"); | |
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517 if (end == _end) { |
0 | 518 return; |
519 } | |
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520 clear_end(); |
0 | 521 |
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522 // Set the new end |
0 | 523 _end = end; |
524 | |
525 _successors.clear(); | |
526 // Now reset successors list based on BlockEnd | |
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527 for (int i = 0; i < end->number_of_sux(); i++) { |
0 | 528 BlockBegin* sux = end->sux_at(i); |
529 _successors.append(sux); | |
530 sux->_predecessors.append(this); | |
531 } | |
532 _end->set_begin(this); | |
533 } | |
534 | |
535 | |
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536 void BlockBegin::clear_end() { |
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537 // Must make the predecessors/successors match up with the |
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538 // BlockEnd's notion. |
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539 if (_end != NULL) { |
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540 // disconnect from the old end |
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541 _end->set_begin(NULL); |
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542 |
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543 // disconnect this block from it's current successors |
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544 for (int i = 0; i < _successors.length(); i++) { |
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545 _successors.at(i)->remove_predecessor(this); |
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546 } |
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547 _end = NULL; |
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548 } |
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549 } |
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550 |
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551 |
0 | 552 void BlockBegin::disconnect_edge(BlockBegin* from, BlockBegin* to) { |
553 // disconnect any edges between from and to | |
554 #ifndef PRODUCT | |
555 if (PrintIR && Verbose) { | |
556 tty->print_cr("Disconnected edge B%d -> B%d", from->block_id(), to->block_id()); | |
557 } | |
558 #endif | |
559 for (int s = 0; s < from->number_of_sux();) { | |
560 BlockBegin* sux = from->sux_at(s); | |
561 if (sux == to) { | |
562 int index = sux->_predecessors.index_of(from); | |
563 if (index >= 0) { | |
564 sux->_predecessors.remove_at(index); | |
565 } | |
566 from->_successors.remove_at(s); | |
567 } else { | |
568 s++; | |
569 } | |
570 } | |
571 } | |
572 | |
573 | |
574 void BlockBegin::disconnect_from_graph() { | |
575 // disconnect this block from all other blocks | |
576 for (int p = 0; p < number_of_preds(); p++) { | |
577 pred_at(p)->remove_successor(this); | |
578 } | |
579 for (int s = 0; s < number_of_sux(); s++) { | |
580 sux_at(s)->remove_predecessor(this); | |
581 } | |
582 } | |
583 | |
584 void BlockBegin::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
585 // modify predecessors before substituting successors | |
586 for (int i = 0; i < number_of_sux(); i++) { | |
587 if (sux_at(i) == old_sux) { | |
588 // remove old predecessor before adding new predecessor | |
589 // otherwise there is a dead predecessor in the list | |
590 new_sux->remove_predecessor(old_sux); | |
591 new_sux->add_predecessor(this); | |
592 } | |
593 } | |
594 old_sux->remove_predecessor(this); | |
595 end()->substitute_sux(old_sux, new_sux); | |
596 } | |
597 | |
598 | |
599 | |
600 // In general it is not possible to calculate a value for the field "depth_first_number" | |
601 // of the inserted block, without recomputing the values of the other blocks | |
602 // in the CFG. Therefore the value of "depth_first_number" in BlockBegin becomes meaningless. | |
603 BlockBegin* BlockBegin::insert_block_between(BlockBegin* sux) { | |
3241 | 604 BlockBegin* new_sux = new BlockBegin(end()->state()->bci()); |
0 | 605 |
606 // mark this block (special treatment when block order is computed) | |
607 new_sux->set(critical_edge_split_flag); | |
608 | |
609 // This goto is not a safepoint. | |
610 Goto* e = new Goto(sux, false); | |
1819 | 611 new_sux->set_next(e, end()->state()->bci()); |
0 | 612 new_sux->set_end(e); |
613 // setup states | |
614 ValueStack* s = end()->state(); | |
615 new_sux->set_state(s->copy()); | |
616 e->set_state(s->copy()); | |
617 assert(new_sux->state()->locals_size() == s->locals_size(), "local size mismatch!"); | |
618 assert(new_sux->state()->stack_size() == s->stack_size(), "stack size mismatch!"); | |
619 assert(new_sux->state()->locks_size() == s->locks_size(), "locks size mismatch!"); | |
620 | |
621 // link predecessor to new block | |
622 end()->substitute_sux(sux, new_sux); | |
623 | |
624 // The ordering needs to be the same, so remove the link that the | |
625 // set_end call above added and substitute the new_sux for this | |
626 // block. | |
627 sux->remove_predecessor(new_sux); | |
628 | |
629 // the successor could be the target of a switch so it might have | |
630 // multiple copies of this predecessor, so substitute the new_sux | |
631 // for the first and delete the rest. | |
632 bool assigned = false; | |
633 BlockList& list = sux->_predecessors; | |
634 for (int i = 0; i < list.length(); i++) { | |
635 BlockBegin** b = list.adr_at(i); | |
636 if (*b == this) { | |
637 if (assigned) { | |
638 list.remove_at(i); | |
639 // reprocess this index | |
640 i--; | |
641 } else { | |
642 assigned = true; | |
643 *b = new_sux; | |
644 } | |
645 // link the new block back to it's predecessors. | |
646 new_sux->add_predecessor(this); | |
647 } | |
648 } | |
649 assert(assigned == true, "should have assigned at least once"); | |
650 return new_sux; | |
651 } | |
652 | |
653 | |
654 void BlockBegin::remove_successor(BlockBegin* pred) { | |
655 int idx; | |
656 while ((idx = _successors.index_of(pred)) >= 0) { | |
657 _successors.remove_at(idx); | |
658 } | |
659 } | |
660 | |
661 | |
662 void BlockBegin::add_predecessor(BlockBegin* pred) { | |
663 _predecessors.append(pred); | |
664 } | |
665 | |
666 | |
667 void BlockBegin::remove_predecessor(BlockBegin* pred) { | |
668 int idx; | |
669 while ((idx = _predecessors.index_of(pred)) >= 0) { | |
670 _predecessors.remove_at(idx); | |
671 } | |
672 } | |
673 | |
674 | |
675 void BlockBegin::add_exception_handler(BlockBegin* b) { | |
676 assert(b != NULL && (b->is_set(exception_entry_flag)), "exception handler must exist"); | |
677 // add only if not in the list already | |
678 if (!_exception_handlers.contains(b)) _exception_handlers.append(b); | |
679 } | |
680 | |
681 int BlockBegin::add_exception_state(ValueStack* state) { | |
682 assert(is_set(exception_entry_flag), "only for xhandlers"); | |
683 if (_exception_states == NULL) { | |
684 _exception_states = new ValueStackStack(4); | |
685 } | |
686 _exception_states->append(state); | |
687 return _exception_states->length() - 1; | |
688 } | |
689 | |
690 | |
691 void BlockBegin::iterate_preorder(boolArray& mark, BlockClosure* closure) { | |
692 if (!mark.at(block_id())) { | |
693 mark.at_put(block_id(), true); | |
694 closure->block_do(this); | |
695 BlockEnd* e = end(); // must do this after block_do because block_do may change it! | |
696 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_preorder(mark, closure); } | |
697 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_preorder(mark, closure); } | |
698 } | |
699 } | |
700 | |
701 | |
702 void BlockBegin::iterate_postorder(boolArray& mark, BlockClosure* closure) { | |
703 if (!mark.at(block_id())) { | |
704 mark.at_put(block_id(), true); | |
705 BlockEnd* e = end(); | |
706 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_postorder(mark, closure); } | |
707 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_postorder(mark, closure); } | |
708 closure->block_do(this); | |
709 } | |
710 } | |
711 | |
712 | |
713 void BlockBegin::iterate_preorder(BlockClosure* closure) { | |
714 boolArray mark(number_of_blocks(), false); | |
715 iterate_preorder(mark, closure); | |
716 } | |
717 | |
718 | |
719 void BlockBegin::iterate_postorder(BlockClosure* closure) { | |
720 boolArray mark(number_of_blocks(), false); | |
721 iterate_postorder(mark, closure); | |
722 } | |
723 | |
724 | |
1584 | 725 void BlockBegin::block_values_do(ValueVisitor* f) { |
0 | 726 for (Instruction* n = this; n != NULL; n = n->next()) n->values_do(f); |
727 } | |
728 | |
729 | |
730 #ifndef PRODUCT | |
1783 | 731 #define TRACE_PHI(code) if (PrintPhiFunctions) { code; } |
0 | 732 #else |
1783 | 733 #define TRACE_PHI(coce) |
0 | 734 #endif |
735 | |
736 | |
737 bool BlockBegin::try_merge(ValueStack* new_state) { | |
738 TRACE_PHI(tty->print_cr("********** try_merge for block B%d", block_id())); | |
739 | |
740 // local variables used for state iteration | |
741 int index; | |
742 Value new_value, existing_value; | |
743 | |
744 ValueStack* existing_state = state(); | |
745 if (existing_state == NULL) { | |
746 TRACE_PHI(tty->print_cr("first call of try_merge for this block")); | |
747 | |
748 if (is_set(BlockBegin::was_visited_flag)) { | |
749 // this actually happens for complicated jsr/ret structures | |
750 return false; // BAILOUT in caller | |
751 } | |
752 | |
753 // copy state because it is altered | |
1819 | 754 new_state = new_state->copy(ValueStack::BlockBeginState, bci()); |
0 | 755 |
756 // Use method liveness to invalidate dead locals | |
757 MethodLivenessResult liveness = new_state->scope()->method()->liveness_at_bci(bci()); | |
758 if (liveness.is_valid()) { | |
759 assert((int)liveness.size() == new_state->locals_size(), "error in use of liveness"); | |
760 | |
761 for_each_local_value(new_state, index, new_value) { | |
762 if (!liveness.at(index) || new_value->type()->is_illegal()) { | |
763 new_state->invalidate_local(index); | |
764 TRACE_PHI(tty->print_cr("invalidating dead local %d", index)); | |
765 } | |
766 } | |
767 } | |
768 | |
769 if (is_set(BlockBegin::parser_loop_header_flag)) { | |
770 TRACE_PHI(tty->print_cr("loop header block, initializing phi functions")); | |
771 | |
772 for_each_stack_value(new_state, index, new_value) { | |
773 new_state->setup_phi_for_stack(this, index); | |
774 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)); | |
775 } | |
776 | |
777 BitMap requires_phi_function = new_state->scope()->requires_phi_function(); | |
778 | |
779 for_each_local_value(new_state, index, new_value) { | |
780 bool requires_phi = requires_phi_function.at(index) || (new_value->type()->is_double_word() && requires_phi_function.at(index + 1)); | |
781 if (requires_phi || !SelectivePhiFunctions) { | |
782 new_state->setup_phi_for_local(this, index); | |
783 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)); | |
784 } | |
785 } | |
786 } | |
787 | |
788 // initialize state of block | |
789 set_state(new_state); | |
790 | |
1819 | 791 } else if (existing_state->is_same(new_state)) { |
0 | 792 TRACE_PHI(tty->print_cr("exisiting state found")); |
793 | |
794 assert(existing_state->scope() == new_state->scope(), "not matching"); | |
795 assert(existing_state->locals_size() == new_state->locals_size(), "not matching"); | |
796 assert(existing_state->stack_size() == new_state->stack_size(), "not matching"); | |
797 | |
798 if (is_set(BlockBegin::was_visited_flag)) { | |
799 TRACE_PHI(tty->print_cr("loop header block, phis must be present")); | |
800 | |
801 if (!is_set(BlockBegin::parser_loop_header_flag)) { | |
802 // this actually happens for complicated jsr/ret structures | |
803 return false; // BAILOUT in caller | |
804 } | |
805 | |
806 for_each_local_value(existing_state, index, existing_value) { | |
807 Value new_value = new_state->local_at(index); | |
808 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
809 // The old code invalidated the phi function here | |
810 // Because dead locals are replaced with NULL, this is a very rare case now, so simply bail out | |
811 return false; // BAILOUT in caller | |
812 } | |
813 } | |
814 | |
815 #ifdef ASSERT | |
816 // check that all necessary phi functions are present | |
817 for_each_stack_value(existing_state, index, existing_value) { | |
818 assert(existing_value->as_Phi() != NULL && existing_value->as_Phi()->block() == this, "phi function required"); | |
819 } | |
820 for_each_local_value(existing_state, index, existing_value) { | |
821 assert(existing_value == new_state->local_at(index) || (existing_value->as_Phi() != NULL && existing_value->as_Phi()->as_Phi()->block() == this), "phi function required"); | |
822 } | |
823 #endif | |
824 | |
825 } else { | |
826 TRACE_PHI(tty->print_cr("creating phi functions on demand")); | |
827 | |
828 // create necessary phi functions for stack | |
829 for_each_stack_value(existing_state, index, existing_value) { | |
830 Value new_value = new_state->stack_at(index); | |
831 Phi* existing_phi = existing_value->as_Phi(); | |
832 | |
833 if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
834 existing_state->setup_phi_for_stack(this, index); | |
835 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)); | |
836 } | |
837 } | |
838 | |
839 // create necessary phi functions for locals | |
840 for_each_local_value(existing_state, index, existing_value) { | |
841 Value new_value = new_state->local_at(index); | |
842 Phi* existing_phi = existing_value->as_Phi(); | |
843 | |
844 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
845 existing_state->invalidate_local(index); | |
846 TRACE_PHI(tty->print_cr("invalidating local %d because of type mismatch", index)); | |
847 } else if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
848 existing_state->setup_phi_for_local(this, index); | |
849 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)); | |
850 } | |
851 } | |
852 } | |
853 | |
854 assert(existing_state->caller_state() == new_state->caller_state(), "caller states must be equal"); | |
855 | |
856 } else { | |
857 assert(false, "stack or locks not matching (invalid bytecodes)"); | |
858 return false; | |
859 } | |
860 | |
861 TRACE_PHI(tty->print_cr("********** try_merge for block B%d successful", block_id())); | |
862 | |
863 return true; | |
864 } | |
865 | |
866 | |
867 #ifndef PRODUCT | |
868 void BlockBegin::print_block() { | |
869 InstructionPrinter ip; | |
870 print_block(ip, false); | |
871 } | |
872 | |
873 | |
874 void BlockBegin::print_block(InstructionPrinter& ip, bool live_only) { | |
875 ip.print_instr(this); tty->cr(); | |
876 ip.print_stack(this->state()); tty->cr(); | |
877 ip.print_inline_level(this); | |
878 ip.print_head(); | |
879 for (Instruction* n = next(); n != NULL; n = n->next()) { | |
880 if (!live_only || n->is_pinned() || n->use_count() > 0) { | |
881 ip.print_line(n); | |
882 } | |
883 } | |
884 tty->cr(); | |
885 } | |
886 #endif // PRODUCT | |
887 | |
888 | |
889 // Implementation of BlockList | |
890 | |
891 void BlockList::iterate_forward (BlockClosure* closure) { | |
892 const int l = length(); | |
893 for (int i = 0; i < l; i++) closure->block_do(at(i)); | |
894 } | |
895 | |
896 | |
897 void BlockList::iterate_backward(BlockClosure* closure) { | |
898 for (int i = length() - 1; i >= 0; i--) closure->block_do(at(i)); | |
899 } | |
900 | |
901 | |
902 void BlockList::blocks_do(void f(BlockBegin*)) { | |
903 for (int i = length() - 1; i >= 0; i--) f(at(i)); | |
904 } | |
905 | |
906 | |
1584 | 907 void BlockList::values_do(ValueVisitor* f) { |
0 | 908 for (int i = length() - 1; i >= 0; i--) at(i)->block_values_do(f); |
909 } | |
910 | |
911 | |
912 #ifndef PRODUCT | |
913 void BlockList::print(bool cfg_only, bool live_only) { | |
914 InstructionPrinter ip; | |
915 for (int i = 0; i < length(); i++) { | |
916 BlockBegin* block = at(i); | |
917 if (cfg_only) { | |
918 ip.print_instr(block); tty->cr(); | |
919 } else { | |
920 block->print_block(ip, live_only); | |
921 } | |
922 } | |
923 } | |
924 #endif // PRODUCT | |
925 | |
926 | |
927 // Implementation of BlockEnd | |
928 | |
929 void BlockEnd::set_begin(BlockBegin* begin) { | |
930 BlockList* sux = NULL; | |
931 if (begin != NULL) { | |
932 sux = begin->successors(); | |
933 } else if (_begin != NULL) { | |
934 // copy our sux list | |
935 BlockList* sux = new BlockList(_begin->number_of_sux()); | |
936 for (int i = 0; i < _begin->number_of_sux(); i++) { | |
937 sux->append(_begin->sux_at(i)); | |
938 } | |
939 } | |
940 _sux = sux; | |
941 _begin = begin; | |
942 } | |
943 | |
944 | |
945 void BlockEnd::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
946 substitute(*_sux, old_sux, new_sux); | |
947 } | |
948 | |
949 | |
950 // Implementation of Phi | |
951 | |
952 // Normal phi functions take their operands from the last instruction of the | |
953 // predecessor. Special handling is needed for xhanlder entries because there | |
954 // the state of arbitrary instructions are needed. | |
955 | |
956 Value Phi::operand_at(int i) const { | |
957 ValueStack* state; | |
958 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
959 state = _block->exception_state_at(i); | |
960 } else { | |
961 state = _block->pred_at(i)->end()->state(); | |
962 } | |
963 assert(state != NULL, ""); | |
964 | |
965 if (is_local()) { | |
966 return state->local_at(local_index()); | |
967 } else { | |
968 return state->stack_at(stack_index()); | |
969 } | |
970 } | |
971 | |
972 | |
973 int Phi::operand_count() const { | |
974 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
975 return _block->number_of_exception_states(); | |
976 } else { | |
977 return _block->number_of_preds(); | |
978 } | |
979 } | |
980 | |
981 | |
1783 | 982 |
983 void ProfileInvoke::state_values_do(ValueVisitor* f) { | |
984 if (state() != NULL) state()->values_do(f); | |
985 } |