Mercurial > hg > truffle
annotate src/share/vm/c1/c1_Instruction.cpp @ 21194:5557f74bfd30
MoveResolver: improve assertion.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 22 Apr 2015 14:17:11 +0200 |
parents | 89152779163c |
children |
rev | line source |
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0 | 1 /* |
17524 | 2 * Copyright (c) 1999, 2013, 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 | |
8860 | 37 int Instruction::dominator_depth() { |
38 int result = -1; | |
39 if (block()) { | |
40 result = block()->dominator_depth(); | |
41 } | |
42 assert(result != -1 || this->as_Local(), "Only locals have dominator depth -1"); | |
43 return result; | |
44 } | |
45 | |
0 | 46 Instruction::Condition Instruction::mirror(Condition cond) { |
47 switch (cond) { | |
48 case eql: return eql; | |
49 case neq: return neq; | |
50 case lss: return gtr; | |
51 case leq: return geq; | |
52 case gtr: return lss; | |
53 case geq: return leq; | |
8860 | 54 case aeq: return beq; |
55 case beq: return aeq; | |
0 | 56 } |
57 ShouldNotReachHere(); | |
58 return eql; | |
59 } | |
60 | |
61 | |
62 Instruction::Condition Instruction::negate(Condition cond) { | |
63 switch (cond) { | |
64 case eql: return neq; | |
65 case neq: return eql; | |
66 case lss: return geq; | |
67 case leq: return gtr; | |
68 case gtr: return leq; | |
69 case geq: return lss; | |
8860 | 70 case aeq: assert(false, "Above equal cannot be negated"); |
71 case beq: assert(false, "Below equal cannot be negated"); | |
0 | 72 } |
73 ShouldNotReachHere(); | |
74 return eql; | |
75 } | |
76 | |
1819 | 77 void Instruction::update_exception_state(ValueStack* state) { |
78 if (state != NULL && (state->kind() == ValueStack::EmptyExceptionState || state->kind() == ValueStack::ExceptionState)) { | |
14909 | 79 assert(state->kind() == ValueStack::EmptyExceptionState || Compilation::current()->env()->jvmti_can_access_local_variables(), "unexpected state kind"); |
1819 | 80 _exception_state = state; |
81 } else { | |
82 _exception_state = NULL; | |
83 } | |
84 } | |
85 | |
8860 | 86 // Prev without need to have BlockBegin |
87 Instruction* Instruction::prev() { | |
0 | 88 Instruction* p = NULL; |
8860 | 89 Instruction* q = block(); |
0 | 90 while (q != this) { |
91 assert(q != NULL, "this is not in the block's instruction list"); | |
92 p = q; q = q->next(); | |
93 } | |
94 return p; | |
95 } | |
96 | |
97 | |
1819 | 98 void Instruction::state_values_do(ValueVisitor* f) { |
99 if (state_before() != NULL) { | |
100 state_before()->values_do(f); | |
101 } | |
102 if (exception_state() != NULL){ | |
103 exception_state()->values_do(f); | |
104 } | |
105 } | |
106 | |
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107 ciType* Instruction::exact_type() const { |
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108 ciType* t = declared_type(); |
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109 if (t != NULL && t->is_klass()) { |
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110 return t->as_klass()->exact_klass(); |
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111 } |
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112 return NULL; |
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113 } |
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114 |
1819 | 115 |
0 | 116 #ifndef PRODUCT |
1819 | 117 void Instruction::check_state(ValueStack* state) { |
118 if (state != NULL) { | |
119 state->verify(); | |
120 } | |
121 } | |
122 | |
123 | |
0 | 124 void Instruction::print() { |
125 InstructionPrinter ip; | |
126 print(ip); | |
127 } | |
128 | |
129 | |
130 void Instruction::print_line() { | |
131 InstructionPrinter ip; | |
132 ip.print_line(this); | |
133 } | |
134 | |
135 | |
136 void Instruction::print(InstructionPrinter& ip) { | |
137 ip.print_head(); | |
138 ip.print_line(this); | |
139 tty->cr(); | |
140 } | |
141 #endif // PRODUCT | |
142 | |
143 | |
144 // perform constant and interval tests on index value | |
145 bool AccessIndexed::compute_needs_range_check() { | |
8860 | 146 if (length()) { |
147 Constant* clength = length()->as_Constant(); | |
148 Constant* cindex = index()->as_Constant(); | |
149 if (clength && cindex) { | |
150 IntConstant* l = clength->type()->as_IntConstant(); | |
151 IntConstant* i = cindex->type()->as_IntConstant(); | |
152 if (l && i && i->value() < l->value() && i->value() >= 0) { | |
153 return false; | |
154 } | |
0 | 155 } |
156 } | |
8860 | 157 |
158 if (!this->check_flag(NeedsRangeCheckFlag)) { | |
159 return false; | |
160 } | |
161 | |
0 | 162 return true; |
163 } | |
164 | |
165 | |
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166 ciType* Constant::exact_type() const { |
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167 if (type()->is_object() && type()->as_ObjectType()->is_loaded()) { |
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168 return type()->as_ObjectType()->exact_type(); |
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169 } |
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170 return NULL; |
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171 } |
2446 | 172 |
0 | 173 ciType* LoadIndexed::exact_type() const { |
174 ciType* array_type = array()->exact_type(); | |
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175 if (array_type != NULL) { |
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176 assert(array_type->is_array_klass(), "what else?"); |
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177 ciArrayKlass* ak = (ciArrayKlass*)array_type; |
0 | 178 |
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179 if (ak->element_type()->is_instance_klass()) { |
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180 ciInstanceKlass* ik = (ciInstanceKlass*)ak->element_type(); |
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181 if (ik->is_loaded() && ik->is_final()) { |
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182 return ik; |
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183 } |
0 | 184 } |
185 } | |
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186 return Instruction::exact_type(); |
0 | 187 } |
188 | |
189 | |
190 ciType* LoadIndexed::declared_type() const { | |
191 ciType* array_type = array()->declared_type(); | |
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192 if (array_type == NULL || !array_type->is_loaded()) { |
0 | 193 return NULL; |
194 } | |
195 assert(array_type->is_array_klass(), "what else?"); | |
196 ciArrayKlass* ak = (ciArrayKlass*)array_type; | |
197 return ak->element_type(); | |
198 } | |
199 | |
200 | |
201 ciType* LoadField::declared_type() const { | |
202 return field()->type(); | |
203 } | |
204 | |
205 | |
206 ciType* NewTypeArray::exact_type() const { | |
207 return ciTypeArrayKlass::make(elt_type()); | |
208 } | |
209 | |
210 ciType* NewObjectArray::exact_type() const { | |
211 return ciObjArrayKlass::make(klass()); | |
212 } | |
213 | |
2446 | 214 ciType* NewArray::declared_type() const { |
215 return exact_type(); | |
216 } | |
0 | 217 |
218 ciType* NewInstance::exact_type() const { | |
219 return klass(); | |
220 } | |
221 | |
2446 | 222 ciType* NewInstance::declared_type() const { |
223 return exact_type(); | |
224 } | |
0 | 225 |
226 ciType* CheckCast::declared_type() const { | |
227 return klass(); | |
228 } | |
229 | |
230 // Implementation of ArithmeticOp | |
231 | |
232 bool ArithmeticOp::is_commutative() const { | |
233 switch (op()) { | |
234 case Bytecodes::_iadd: // fall through | |
235 case Bytecodes::_ladd: // fall through | |
236 case Bytecodes::_fadd: // fall through | |
237 case Bytecodes::_dadd: // fall through | |
238 case Bytecodes::_imul: // fall through | |
239 case Bytecodes::_lmul: // fall through | |
240 case Bytecodes::_fmul: // fall through | |
241 case Bytecodes::_dmul: return true; | |
242 } | |
243 return false; | |
244 } | |
245 | |
246 | |
247 bool ArithmeticOp::can_trap() const { | |
248 switch (op()) { | |
249 case Bytecodes::_idiv: // fall through | |
250 case Bytecodes::_ldiv: // fall through | |
251 case Bytecodes::_irem: // fall through | |
252 case Bytecodes::_lrem: return true; | |
253 } | |
254 return false; | |
255 } | |
256 | |
257 | |
258 // Implementation of LogicOp | |
259 | |
260 bool LogicOp::is_commutative() const { | |
261 #ifdef ASSERT | |
262 switch (op()) { | |
263 case Bytecodes::_iand: // fall through | |
264 case Bytecodes::_land: // fall through | |
265 case Bytecodes::_ior : // fall through | |
266 case Bytecodes::_lor : // fall through | |
267 case Bytecodes::_ixor: // fall through | |
268 case Bytecodes::_lxor: break; | |
269 default : ShouldNotReachHere(); | |
270 } | |
271 #endif | |
272 // all LogicOps are commutative | |
273 return true; | |
274 } | |
275 | |
276 | |
277 // Implementation of IfOp | |
278 | |
279 bool IfOp::is_commutative() const { | |
280 return cond() == eql || cond() == neq; | |
281 } | |
282 | |
283 | |
284 // Implementation of StateSplit | |
285 | |
286 void StateSplit::substitute(BlockList& list, BlockBegin* old_block, BlockBegin* new_block) { | |
287 NOT_PRODUCT(bool assigned = false;) | |
288 for (int i = 0; i < list.length(); i++) { | |
289 BlockBegin** b = list.adr_at(i); | |
290 if (*b == old_block) { | |
291 *b = new_block; | |
292 NOT_PRODUCT(assigned = true;) | |
293 } | |
294 } | |
295 assert(assigned == true, "should have assigned at least once"); | |
296 } | |
297 | |
298 | |
299 IRScope* StateSplit::scope() const { | |
300 return _state->scope(); | |
301 } | |
302 | |
303 | |
1584 | 304 void StateSplit::state_values_do(ValueVisitor* f) { |
1819 | 305 Instruction::state_values_do(f); |
0 | 306 if (state() != NULL) state()->values_do(f); |
307 } | |
308 | |
309 | |
1584 | 310 void BlockBegin::state_values_do(ValueVisitor* f) { |
0 | 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 // Implementation of Invoke | |
322 | |
323 | |
324 Invoke::Invoke(Bytecodes::Code code, ValueType* result_type, Value recv, Values* args, | |
1295 | 325 int vtable_index, ciMethod* target, ValueStack* state_before) |
1819 | 326 : StateSplit(result_type, state_before) |
0 | 327 , _code(code) |
328 , _recv(recv) | |
329 , _args(args) | |
330 , _vtable_index(vtable_index) | |
331 , _target(target) | |
332 { | |
333 set_flag(TargetIsLoadedFlag, target->is_loaded()); | |
334 set_flag(TargetIsFinalFlag, target_is_loaded() && target->is_final_method()); | |
335 set_flag(TargetIsStrictfpFlag, target_is_loaded() && target->is_strict()); | |
336 | |
337 assert(args != NULL, "args must exist"); | |
338 #ifdef ASSERT | |
1584 | 339 AssertValues assert_value; |
340 values_do(&assert_value); | |
341 #endif | |
0 | 342 |
343 // provide an initial guess of signature size. | |
344 _signature = new BasicTypeList(number_of_arguments() + (has_receiver() ? 1 : 0)); | |
345 if (has_receiver()) { | |
346 _signature->append(as_BasicType(receiver()->type())); | |
347 } | |
348 for (int i = 0; i < number_of_arguments(); i++) { | |
349 ValueType* t = argument_at(i)->type(); | |
350 BasicType bt = as_BasicType(t); | |
351 _signature->append(bt); | |
352 } | |
353 } | |
354 | |
355 | |
1584 | 356 void Invoke::state_values_do(ValueVisitor* f) { |
1295 | 357 StateSplit::state_values_do(f); |
358 if (state_before() != NULL) state_before()->values_do(f); | |
359 if (state() != NULL) state()->values_do(f); | |
360 } | |
361 | |
2446 | 362 ciType* Invoke::declared_type() const { |
363 ciType *t = _target->signature()->return_type(); | |
364 assert(t->basic_type() != T_VOID, "need return value of void method?"); | |
365 return t; | |
366 } | |
1295 | 367 |
0 | 368 // Implementation of Contant |
369 intx Constant::hash() const { | |
1819 | 370 if (state_before() == NULL) { |
0 | 371 switch (type()->tag()) { |
372 case intTag: | |
373 return HASH2(name(), type()->as_IntConstant()->value()); | |
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374 case addressTag: |
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375 return HASH2(name(), type()->as_AddressConstant()->value()); |
0 | 376 case longTag: |
377 { | |
378 jlong temp = type()->as_LongConstant()->value(); | |
379 return HASH3(name(), high(temp), low(temp)); | |
380 } | |
381 case floatTag: | |
382 return HASH2(name(), jint_cast(type()->as_FloatConstant()->value())); | |
383 case doubleTag: | |
384 { | |
385 jlong temp = jlong_cast(type()->as_DoubleConstant()->value()); | |
386 return HASH3(name(), high(temp), low(temp)); | |
387 } | |
388 case objectTag: | |
389 assert(type()->as_ObjectType()->is_loaded(), "can't handle unloaded values"); | |
390 return HASH2(name(), type()->as_ObjectType()->constant_value()); | |
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391 case metaDataTag: |
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392 assert(type()->as_MetadataType()->is_loaded(), "can't handle unloaded values"); |
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393 return HASH2(name(), type()->as_MetadataType()->constant_value()); |
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394 default: |
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395 ShouldNotReachHere(); |
0 | 396 } |
397 } | |
398 return 0; | |
399 } | |
400 | |
401 bool Constant::is_equal(Value v) const { | |
402 if (v->as_Constant() == NULL) return false; | |
403 | |
404 switch (type()->tag()) { | |
405 case intTag: | |
406 { | |
407 IntConstant* t1 = type()->as_IntConstant(); | |
408 IntConstant* t2 = v->type()->as_IntConstant(); | |
409 return (t1 != NULL && t2 != NULL && | |
410 t1->value() == t2->value()); | |
411 } | |
412 case longTag: | |
413 { | |
414 LongConstant* t1 = type()->as_LongConstant(); | |
415 LongConstant* t2 = v->type()->as_LongConstant(); | |
416 return (t1 != NULL && t2 != NULL && | |
417 t1->value() == t2->value()); | |
418 } | |
419 case floatTag: | |
420 { | |
421 FloatConstant* t1 = type()->as_FloatConstant(); | |
422 FloatConstant* t2 = v->type()->as_FloatConstant(); | |
423 return (t1 != NULL && t2 != NULL && | |
424 jint_cast(t1->value()) == jint_cast(t2->value())); | |
425 } | |
426 case doubleTag: | |
427 { | |
428 DoubleConstant* t1 = type()->as_DoubleConstant(); | |
429 DoubleConstant* t2 = v->type()->as_DoubleConstant(); | |
430 return (t1 != NULL && t2 != NULL && | |
431 jlong_cast(t1->value()) == jlong_cast(t2->value())); | |
432 } | |
433 case objectTag: | |
434 { | |
435 ObjectType* t1 = type()->as_ObjectType(); | |
436 ObjectType* t2 = v->type()->as_ObjectType(); | |
437 return (t1 != NULL && t2 != NULL && | |
438 t1->is_loaded() && t2->is_loaded() && | |
439 t1->constant_value() == t2->constant_value()); | |
440 } | |
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441 case metaDataTag: |
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442 { |
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443 MetadataType* t1 = type()->as_MetadataType(); |
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444 MetadataType* t2 = v->type()->as_MetadataType(); |
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445 return (t1 != NULL && t2 != NULL && |
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446 t1->is_loaded() && t2->is_loaded() && |
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447 t1->constant_value() == t2->constant_value()); |
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448 } |
0 | 449 } |
450 return false; | |
451 } | |
452 | |
1899 | 453 Constant::CompareResult Constant::compare(Instruction::Condition cond, Value right) const { |
0 | 454 Constant* rc = right->as_Constant(); |
455 // other is not a constant | |
1899 | 456 if (rc == NULL) return not_comparable; |
0 | 457 |
458 ValueType* lt = type(); | |
459 ValueType* rt = rc->type(); | |
460 // different types | |
1899 | 461 if (lt->base() != rt->base()) return not_comparable; |
0 | 462 switch (lt->tag()) { |
463 case intTag: { | |
464 int x = lt->as_IntConstant()->value(); | |
465 int y = rt->as_IntConstant()->value(); | |
466 switch (cond) { | |
1899 | 467 case If::eql: return x == y ? cond_true : cond_false; |
468 case If::neq: return x != y ? cond_true : cond_false; | |
469 case If::lss: return x < y ? cond_true : cond_false; | |
470 case If::leq: return x <= y ? cond_true : cond_false; | |
471 case If::gtr: return x > y ? cond_true : cond_false; | |
472 case If::geq: return x >= y ? cond_true : cond_false; | |
0 | 473 } |
474 break; | |
475 } | |
476 case longTag: { | |
477 jlong x = lt->as_LongConstant()->value(); | |
478 jlong y = rt->as_LongConstant()->value(); | |
479 switch (cond) { | |
1899 | 480 case If::eql: return x == y ? cond_true : cond_false; |
481 case If::neq: return x != y ? cond_true : cond_false; | |
482 case If::lss: return x < y ? cond_true : cond_false; | |
483 case If::leq: return x <= y ? cond_true : cond_false; | |
484 case If::gtr: return x > y ? cond_true : cond_false; | |
485 case If::geq: return x >= y ? cond_true : cond_false; | |
0 | 486 } |
487 break; | |
488 } | |
489 case objectTag: { | |
490 ciObject* xvalue = lt->as_ObjectType()->constant_value(); | |
491 ciObject* yvalue = rt->as_ObjectType()->constant_value(); | |
492 assert(xvalue != NULL && yvalue != NULL, "not constants"); | |
493 if (xvalue->is_loaded() && yvalue->is_loaded()) { | |
494 switch (cond) { | |
1899 | 495 case If::eql: return xvalue == yvalue ? cond_true : cond_false; |
496 case If::neq: return xvalue != yvalue ? cond_true : cond_false; | |
0 | 497 } |
498 } | |
499 break; | |
500 } | |
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501 case metaDataTag: { |
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502 ciMetadata* xvalue = lt->as_MetadataType()->constant_value(); |
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503 ciMetadata* yvalue = rt->as_MetadataType()->constant_value(); |
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504 assert(xvalue != NULL && yvalue != NULL, "not constants"); |
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505 if (xvalue->is_loaded() && yvalue->is_loaded()) { |
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506 switch (cond) { |
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507 case If::eql: return xvalue == yvalue ? cond_true : cond_false; |
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508 case If::neq: return xvalue != yvalue ? cond_true : cond_false; |
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509 } |
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510 } |
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511 break; |
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512 } |
0 | 513 } |
1899 | 514 return not_comparable; |
0 | 515 } |
516 | |
517 | |
518 // Implementation of BlockBegin | |
519 | |
520 void BlockBegin::set_end(BlockEnd* end) { | |
521 assert(end != NULL, "should not reset block end to NULL"); | |
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522 if (end == _end) { |
0 | 523 return; |
524 } | |
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525 clear_end(); |
0 | 526 |
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527 // Set the new end |
0 | 528 _end = end; |
529 | |
530 _successors.clear(); | |
531 // Now reset successors list based on BlockEnd | |
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532 for (int i = 0; i < end->number_of_sux(); i++) { |
0 | 533 BlockBegin* sux = end->sux_at(i); |
534 _successors.append(sux); | |
535 sux->_predecessors.append(this); | |
536 } | |
537 _end->set_begin(this); | |
538 } | |
539 | |
540 | |
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541 void BlockBegin::clear_end() { |
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542 // Must make the predecessors/successors match up with the |
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543 // BlockEnd's notion. |
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544 if (_end != NULL) { |
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545 // disconnect from the old end |
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546 _end->set_begin(NULL); |
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547 |
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548 // disconnect this block from it's current successors |
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549 for (int i = 0; i < _successors.length(); i++) { |
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550 _successors.at(i)->remove_predecessor(this); |
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551 } |
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552 _end = NULL; |
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553 } |
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554 } |
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555 |
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556 |
0 | 557 void BlockBegin::disconnect_edge(BlockBegin* from, BlockBegin* to) { |
558 // disconnect any edges between from and to | |
559 #ifndef PRODUCT | |
560 if (PrintIR && Verbose) { | |
561 tty->print_cr("Disconnected edge B%d -> B%d", from->block_id(), to->block_id()); | |
562 } | |
563 #endif | |
564 for (int s = 0; s < from->number_of_sux();) { | |
565 BlockBegin* sux = from->sux_at(s); | |
566 if (sux == to) { | |
567 int index = sux->_predecessors.index_of(from); | |
568 if (index >= 0) { | |
569 sux->_predecessors.remove_at(index); | |
570 } | |
571 from->_successors.remove_at(s); | |
572 } else { | |
573 s++; | |
574 } | |
575 } | |
576 } | |
577 | |
578 | |
579 void BlockBegin::disconnect_from_graph() { | |
580 // disconnect this block from all other blocks | |
581 for (int p = 0; p < number_of_preds(); p++) { | |
582 pred_at(p)->remove_successor(this); | |
583 } | |
584 for (int s = 0; s < number_of_sux(); s++) { | |
585 sux_at(s)->remove_predecessor(this); | |
586 } | |
587 } | |
588 | |
589 void BlockBegin::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
590 // modify predecessors before substituting successors | |
591 for (int i = 0; i < number_of_sux(); i++) { | |
592 if (sux_at(i) == old_sux) { | |
593 // remove old predecessor before adding new predecessor | |
594 // otherwise there is a dead predecessor in the list | |
595 new_sux->remove_predecessor(old_sux); | |
596 new_sux->add_predecessor(this); | |
597 } | |
598 } | |
599 old_sux->remove_predecessor(this); | |
600 end()->substitute_sux(old_sux, new_sux); | |
601 } | |
602 | |
603 | |
604 | |
605 // In general it is not possible to calculate a value for the field "depth_first_number" | |
606 // of the inserted block, without recomputing the values of the other blocks | |
607 // in the CFG. Therefore the value of "depth_first_number" in BlockBegin becomes meaningless. | |
608 BlockBegin* BlockBegin::insert_block_between(BlockBegin* sux) { | |
8860 | 609 int bci = sux->bci(); |
610 // critical edge splitting may introduce a goto after a if and array | |
611 // bound check elimination may insert a predicate between the if and | |
612 // goto. The bci of the goto can't be the one of the if otherwise | |
613 // the state and bci are inconsistent and a deoptimization triggered | |
614 // by the predicate would lead to incorrect execution/a crash. | |
615 BlockBegin* new_sux = new BlockBegin(bci); | |
0 | 616 |
617 // mark this block (special treatment when block order is computed) | |
618 new_sux->set(critical_edge_split_flag); | |
619 | |
620 // This goto is not a safepoint. | |
621 Goto* e = new Goto(sux, false); | |
8860 | 622 new_sux->set_next(e, bci); |
0 | 623 new_sux->set_end(e); |
624 // setup states | |
625 ValueStack* s = end()->state(); | |
8860 | 626 new_sux->set_state(s->copy(s->kind(), bci)); |
627 e->set_state(s->copy(s->kind(), bci)); | |
0 | 628 assert(new_sux->state()->locals_size() == s->locals_size(), "local size mismatch!"); |
629 assert(new_sux->state()->stack_size() == s->stack_size(), "stack size mismatch!"); | |
630 assert(new_sux->state()->locks_size() == s->locks_size(), "locks size mismatch!"); | |
631 | |
632 // link predecessor to new block | |
633 end()->substitute_sux(sux, new_sux); | |
634 | |
635 // The ordering needs to be the same, so remove the link that the | |
636 // set_end call above added and substitute the new_sux for this | |
637 // block. | |
638 sux->remove_predecessor(new_sux); | |
639 | |
640 // the successor could be the target of a switch so it might have | |
641 // multiple copies of this predecessor, so substitute the new_sux | |
642 // for the first and delete the rest. | |
643 bool assigned = false; | |
644 BlockList& list = sux->_predecessors; | |
645 for (int i = 0; i < list.length(); i++) { | |
646 BlockBegin** b = list.adr_at(i); | |
647 if (*b == this) { | |
648 if (assigned) { | |
649 list.remove_at(i); | |
650 // reprocess this index | |
651 i--; | |
652 } else { | |
653 assigned = true; | |
654 *b = new_sux; | |
655 } | |
656 // link the new block back to it's predecessors. | |
657 new_sux->add_predecessor(this); | |
658 } | |
659 } | |
660 assert(assigned == true, "should have assigned at least once"); | |
661 return new_sux; | |
662 } | |
663 | |
664 | |
665 void BlockBegin::remove_successor(BlockBegin* pred) { | |
666 int idx; | |
667 while ((idx = _successors.index_of(pred)) >= 0) { | |
668 _successors.remove_at(idx); | |
669 } | |
670 } | |
671 | |
672 | |
673 void BlockBegin::add_predecessor(BlockBegin* pred) { | |
674 _predecessors.append(pred); | |
675 } | |
676 | |
677 | |
678 void BlockBegin::remove_predecessor(BlockBegin* pred) { | |
679 int idx; | |
680 while ((idx = _predecessors.index_of(pred)) >= 0) { | |
681 _predecessors.remove_at(idx); | |
682 } | |
683 } | |
684 | |
685 | |
686 void BlockBegin::add_exception_handler(BlockBegin* b) { | |
687 assert(b != NULL && (b->is_set(exception_entry_flag)), "exception handler must exist"); | |
688 // add only if not in the list already | |
689 if (!_exception_handlers.contains(b)) _exception_handlers.append(b); | |
690 } | |
691 | |
692 int BlockBegin::add_exception_state(ValueStack* state) { | |
693 assert(is_set(exception_entry_flag), "only for xhandlers"); | |
694 if (_exception_states == NULL) { | |
695 _exception_states = new ValueStackStack(4); | |
696 } | |
697 _exception_states->append(state); | |
698 return _exception_states->length() - 1; | |
699 } | |
700 | |
701 | |
702 void BlockBegin::iterate_preorder(boolArray& mark, BlockClosure* closure) { | |
703 if (!mark.at(block_id())) { | |
704 mark.at_put(block_id(), true); | |
705 closure->block_do(this); | |
706 BlockEnd* e = end(); // must do this after block_do because block_do may change it! | |
707 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_preorder(mark, closure); } | |
708 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_preorder(mark, closure); } | |
709 } | |
710 } | |
711 | |
712 | |
713 void BlockBegin::iterate_postorder(boolArray& mark, BlockClosure* closure) { | |
714 if (!mark.at(block_id())) { | |
715 mark.at_put(block_id(), true); | |
716 BlockEnd* e = end(); | |
717 { for (int i = number_of_exception_handlers() - 1; i >= 0; i--) exception_handler_at(i)->iterate_postorder(mark, closure); } | |
718 { for (int i = e->number_of_sux () - 1; i >= 0; i--) e->sux_at (i)->iterate_postorder(mark, closure); } | |
719 closure->block_do(this); | |
720 } | |
721 } | |
722 | |
723 | |
724 void BlockBegin::iterate_preorder(BlockClosure* closure) { | |
725 boolArray mark(number_of_blocks(), false); | |
726 iterate_preorder(mark, closure); | |
727 } | |
728 | |
729 | |
730 void BlockBegin::iterate_postorder(BlockClosure* closure) { | |
731 boolArray mark(number_of_blocks(), false); | |
732 iterate_postorder(mark, closure); | |
733 } | |
734 | |
735 | |
1584 | 736 void BlockBegin::block_values_do(ValueVisitor* f) { |
0 | 737 for (Instruction* n = this; n != NULL; n = n->next()) n->values_do(f); |
738 } | |
739 | |
740 | |
741 #ifndef PRODUCT | |
1783 | 742 #define TRACE_PHI(code) if (PrintPhiFunctions) { code; } |
0 | 743 #else |
1783 | 744 #define TRACE_PHI(coce) |
0 | 745 #endif |
746 | |
747 | |
748 bool BlockBegin::try_merge(ValueStack* new_state) { | |
749 TRACE_PHI(tty->print_cr("********** try_merge for block B%d", block_id())); | |
750 | |
751 // local variables used for state iteration | |
752 int index; | |
753 Value new_value, existing_value; | |
754 | |
755 ValueStack* existing_state = state(); | |
756 if (existing_state == NULL) { | |
757 TRACE_PHI(tty->print_cr("first call of try_merge for this block")); | |
758 | |
759 if (is_set(BlockBegin::was_visited_flag)) { | |
760 // this actually happens for complicated jsr/ret structures | |
761 return false; // BAILOUT in caller | |
762 } | |
763 | |
764 // copy state because it is altered | |
1819 | 765 new_state = new_state->copy(ValueStack::BlockBeginState, bci()); |
0 | 766 |
767 // Use method liveness to invalidate dead locals | |
768 MethodLivenessResult liveness = new_state->scope()->method()->liveness_at_bci(bci()); | |
769 if (liveness.is_valid()) { | |
770 assert((int)liveness.size() == new_state->locals_size(), "error in use of liveness"); | |
771 | |
772 for_each_local_value(new_state, index, new_value) { | |
773 if (!liveness.at(index) || new_value->type()->is_illegal()) { | |
774 new_state->invalidate_local(index); | |
775 TRACE_PHI(tty->print_cr("invalidating dead local %d", index)); | |
776 } | |
777 } | |
778 } | |
779 | |
780 if (is_set(BlockBegin::parser_loop_header_flag)) { | |
781 TRACE_PHI(tty->print_cr("loop header block, initializing phi functions")); | |
782 | |
783 for_each_stack_value(new_state, index, new_value) { | |
784 new_state->setup_phi_for_stack(this, index); | |
785 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)); | |
786 } | |
787 | |
788 BitMap requires_phi_function = new_state->scope()->requires_phi_function(); | |
789 | |
790 for_each_local_value(new_state, index, new_value) { | |
791 bool requires_phi = requires_phi_function.at(index) || (new_value->type()->is_double_word() && requires_phi_function.at(index + 1)); | |
792 if (requires_phi || !SelectivePhiFunctions) { | |
793 new_state->setup_phi_for_local(this, index); | |
794 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)); | |
795 } | |
796 } | |
797 } | |
798 | |
799 // initialize state of block | |
800 set_state(new_state); | |
801 | |
1819 | 802 } else if (existing_state->is_same(new_state)) { |
0 | 803 TRACE_PHI(tty->print_cr("exisiting state found")); |
804 | |
805 assert(existing_state->scope() == new_state->scope(), "not matching"); | |
806 assert(existing_state->locals_size() == new_state->locals_size(), "not matching"); | |
807 assert(existing_state->stack_size() == new_state->stack_size(), "not matching"); | |
808 | |
809 if (is_set(BlockBegin::was_visited_flag)) { | |
810 TRACE_PHI(tty->print_cr("loop header block, phis must be present")); | |
811 | |
812 if (!is_set(BlockBegin::parser_loop_header_flag)) { | |
813 // this actually happens for complicated jsr/ret structures | |
814 return false; // BAILOUT in caller | |
815 } | |
816 | |
817 for_each_local_value(existing_state, index, existing_value) { | |
818 Value new_value = new_state->local_at(index); | |
819 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
820 // The old code invalidated the phi function here | |
821 // Because dead locals are replaced with NULL, this is a very rare case now, so simply bail out | |
822 return false; // BAILOUT in caller | |
823 } | |
824 } | |
825 | |
826 #ifdef ASSERT | |
827 // check that all necessary phi functions are present | |
828 for_each_stack_value(existing_state, index, existing_value) { | |
829 assert(existing_value->as_Phi() != NULL && existing_value->as_Phi()->block() == this, "phi function required"); | |
830 } | |
831 for_each_local_value(existing_state, index, existing_value) { | |
832 assert(existing_value == new_state->local_at(index) || (existing_value->as_Phi() != NULL && existing_value->as_Phi()->as_Phi()->block() == this), "phi function required"); | |
833 } | |
834 #endif | |
835 | |
836 } else { | |
837 TRACE_PHI(tty->print_cr("creating phi functions on demand")); | |
838 | |
839 // create necessary phi functions for stack | |
840 for_each_stack_value(existing_state, index, existing_value) { | |
841 Value new_value = new_state->stack_at(index); | |
842 Phi* existing_phi = existing_value->as_Phi(); | |
843 | |
844 if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
845 existing_state->setup_phi_for_stack(this, index); | |
846 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)); | |
847 } | |
848 } | |
849 | |
850 // create necessary phi functions for locals | |
851 for_each_local_value(existing_state, index, existing_value) { | |
852 Value new_value = new_state->local_at(index); | |
853 Phi* existing_phi = existing_value->as_Phi(); | |
854 | |
855 if (new_value == NULL || new_value->type()->tag() != existing_value->type()->tag()) { | |
856 existing_state->invalidate_local(index); | |
857 TRACE_PHI(tty->print_cr("invalidating local %d because of type mismatch", index)); | |
858 } else if (new_value != existing_value && (existing_phi == NULL || existing_phi->block() != this)) { | |
859 existing_state->setup_phi_for_local(this, index); | |
860 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)); | |
861 } | |
862 } | |
863 } | |
864 | |
865 assert(existing_state->caller_state() == new_state->caller_state(), "caller states must be equal"); | |
866 | |
867 } else { | |
868 assert(false, "stack or locks not matching (invalid bytecodes)"); | |
869 return false; | |
870 } | |
871 | |
872 TRACE_PHI(tty->print_cr("********** try_merge for block B%d successful", block_id())); | |
873 | |
874 return true; | |
875 } | |
876 | |
877 | |
878 #ifndef PRODUCT | |
879 void BlockBegin::print_block() { | |
880 InstructionPrinter ip; | |
881 print_block(ip, false); | |
882 } | |
883 | |
884 | |
885 void BlockBegin::print_block(InstructionPrinter& ip, bool live_only) { | |
886 ip.print_instr(this); tty->cr(); | |
887 ip.print_stack(this->state()); tty->cr(); | |
888 ip.print_inline_level(this); | |
889 ip.print_head(); | |
890 for (Instruction* n = next(); n != NULL; n = n->next()) { | |
891 if (!live_only || n->is_pinned() || n->use_count() > 0) { | |
892 ip.print_line(n); | |
893 } | |
894 } | |
895 tty->cr(); | |
896 } | |
897 #endif // PRODUCT | |
898 | |
899 | |
900 // Implementation of BlockList | |
901 | |
902 void BlockList::iterate_forward (BlockClosure* closure) { | |
903 const int l = length(); | |
904 for (int i = 0; i < l; i++) closure->block_do(at(i)); | |
905 } | |
906 | |
907 | |
908 void BlockList::iterate_backward(BlockClosure* closure) { | |
909 for (int i = length() - 1; i >= 0; i--) closure->block_do(at(i)); | |
910 } | |
911 | |
912 | |
913 void BlockList::blocks_do(void f(BlockBegin*)) { | |
914 for (int i = length() - 1; i >= 0; i--) f(at(i)); | |
915 } | |
916 | |
917 | |
1584 | 918 void BlockList::values_do(ValueVisitor* f) { |
0 | 919 for (int i = length() - 1; i >= 0; i--) at(i)->block_values_do(f); |
920 } | |
921 | |
922 | |
923 #ifndef PRODUCT | |
924 void BlockList::print(bool cfg_only, bool live_only) { | |
925 InstructionPrinter ip; | |
926 for (int i = 0; i < length(); i++) { | |
927 BlockBegin* block = at(i); | |
928 if (cfg_only) { | |
929 ip.print_instr(block); tty->cr(); | |
930 } else { | |
931 block->print_block(ip, live_only); | |
932 } | |
933 } | |
934 } | |
935 #endif // PRODUCT | |
936 | |
937 | |
938 // Implementation of BlockEnd | |
939 | |
940 void BlockEnd::set_begin(BlockBegin* begin) { | |
941 BlockList* sux = NULL; | |
942 if (begin != NULL) { | |
943 sux = begin->successors(); | |
8860 | 944 } else if (this->begin() != NULL) { |
0 | 945 // copy our sux list |
8860 | 946 BlockList* sux = new BlockList(this->begin()->number_of_sux()); |
947 for (int i = 0; i < this->begin()->number_of_sux(); i++) { | |
948 sux->append(this->begin()->sux_at(i)); | |
0 | 949 } |
950 } | |
951 _sux = sux; | |
952 } | |
953 | |
954 | |
955 void BlockEnd::substitute_sux(BlockBegin* old_sux, BlockBegin* new_sux) { | |
956 substitute(*_sux, old_sux, new_sux); | |
957 } | |
958 | |
959 | |
960 // Implementation of Phi | |
961 | |
962 // Normal phi functions take their operands from the last instruction of the | |
963 // predecessor. Special handling is needed for xhanlder entries because there | |
964 // the state of arbitrary instructions are needed. | |
965 | |
966 Value Phi::operand_at(int i) const { | |
967 ValueStack* state; | |
968 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
969 state = _block->exception_state_at(i); | |
970 } else { | |
971 state = _block->pred_at(i)->end()->state(); | |
972 } | |
973 assert(state != NULL, ""); | |
974 | |
975 if (is_local()) { | |
976 return state->local_at(local_index()); | |
977 } else { | |
978 return state->stack_at(stack_index()); | |
979 } | |
980 } | |
981 | |
982 | |
983 int Phi::operand_count() const { | |
984 if (_block->is_set(BlockBegin::exception_entry_flag)) { | |
985 return _block->number_of_exception_states(); | |
986 } else { | |
987 return _block->number_of_preds(); | |
988 } | |
989 } | |
990 | |
8860 | 991 #ifdef ASSERT |
992 // Constructor of Assert | |
993 Assert::Assert(Value x, Condition cond, bool unordered_is_true, Value y) : Instruction(illegalType) | |
994 , _x(x) | |
995 , _cond(cond) | |
996 , _y(y) | |
997 { | |
998 set_flag(UnorderedIsTrueFlag, unordered_is_true); | |
999 assert(x->type()->tag() == y->type()->tag(), "types must match"); | |
1000 pin(); | |
0 | 1001 |
8860 | 1002 stringStream strStream; |
1003 Compilation::current()->method()->print_name(&strStream); | |
1004 | |
1005 stringStream strStream1; | |
1006 InstructionPrinter ip1(1, &strStream1); | |
1007 ip1.print_instr(x); | |
1008 | |
1009 stringStream strStream2; | |
1010 InstructionPrinter ip2(1, &strStream2); | |
1011 ip2.print_instr(y); | |
1012 | |
1013 stringStream ss; | |
1014 ss.print("Assertion %s %s %s in method %s", strStream1.as_string(), ip2.cond_name(cond), strStream2.as_string(), strStream.as_string()); | |
1015 | |
1016 _message = ss.as_string(); | |
1017 } | |
1018 #endif | |
1019 | |
1020 void RangeCheckPredicate::check_state() { | |
1021 assert(state()->kind() != ValueStack::EmptyExceptionState && state()->kind() != ValueStack::ExceptionState, "will deopt with empty state"); | |
1022 } | |
1783 | 1023 |
1024 void ProfileInvoke::state_values_do(ValueVisitor* f) { | |
1025 if (state() != NULL) state()->values_do(f); | |
1026 } |