Mercurial > hg > graal-compiler
annotate src/share/vm/opto/cfgnode.cpp @ 6885:685df3c6f84b
7045397: NPG: Add freelists to class loader arenas.
Reviewed-by: coleenp, stefank, jprovino, ohair
author | jmasa |
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date | Tue, 18 Sep 2012 23:35:42 -0700 |
parents | 8e47bac5643a |
children | ad5dd04754ee |
rev | line source |
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0 | 1 /* |
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6964458: Reimplement class meta-data storage to use native memory
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2 * Copyright (c) 1997, 2012, 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 "classfile/systemDictionary.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "oops/objArrayKlass.hpp" | |
29 #include "opto/addnode.hpp" | |
30 #include "opto/cfgnode.hpp" | |
31 #include "opto/connode.hpp" | |
32 #include "opto/loopnode.hpp" | |
33 #include "opto/machnode.hpp" | |
34 #include "opto/mulnode.hpp" | |
35 #include "opto/phaseX.hpp" | |
36 #include "opto/regmask.hpp" | |
37 #include "opto/runtime.hpp" | |
38 #include "opto/subnode.hpp" | |
39 | |
0 | 40 // Portions of code courtesy of Clifford Click |
41 | |
42 // Optimization - Graph Style | |
43 | |
44 //============================================================================= | |
45 //------------------------------Value------------------------------------------ | |
46 // Compute the type of the RegionNode. | |
47 const Type *RegionNode::Value( PhaseTransform *phase ) const { | |
48 for( uint i=1; i<req(); ++i ) { // For all paths in | |
49 Node *n = in(i); // Get Control source | |
50 if( !n ) continue; // Missing inputs are TOP | |
51 if( phase->type(n) == Type::CONTROL ) | |
52 return Type::CONTROL; | |
53 } | |
54 return Type::TOP; // All paths dead? Then so are we | |
55 } | |
56 | |
57 //------------------------------Identity--------------------------------------- | |
58 // Check for Region being Identity. | |
59 Node *RegionNode::Identity( PhaseTransform *phase ) { | |
60 // Cannot have Region be an identity, even if it has only 1 input. | |
61 // Phi users cannot have their Region input folded away for them, | |
62 // since they need to select the proper data input | |
63 return this; | |
64 } | |
65 | |
66 //------------------------------merge_region----------------------------------- | |
67 // If a Region flows into a Region, merge into one big happy merge. This is | |
68 // hard to do if there is stuff that has to happen | |
69 static Node *merge_region(RegionNode *region, PhaseGVN *phase) { | |
70 if( region->Opcode() != Op_Region ) // Do not do to LoopNodes | |
71 return NULL; | |
72 Node *progress = NULL; // Progress flag | |
73 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
74 | |
75 uint rreq = region->req(); | |
76 for( uint i = 1; i < rreq; i++ ) { | |
77 Node *r = region->in(i); | |
78 if( r && r->Opcode() == Op_Region && // Found a region? | |
79 r->in(0) == r && // Not already collapsed? | |
80 r != region && // Avoid stupid situations | |
81 r->outcnt() == 2 ) { // Self user and 'region' user only? | |
82 assert(!r->as_Region()->has_phi(), "no phi users"); | |
83 if( !progress ) { // No progress | |
84 if (region->has_phi()) { | |
85 return NULL; // Only flatten if no Phi users | |
86 // igvn->hash_delete( phi ); | |
87 } | |
88 igvn->hash_delete( region ); | |
89 progress = region; // Making progress | |
90 } | |
91 igvn->hash_delete( r ); | |
92 | |
93 // Append inputs to 'r' onto 'region' | |
94 for( uint j = 1; j < r->req(); j++ ) { | |
95 // Move an input from 'r' to 'region' | |
96 region->add_req(r->in(j)); | |
97 r->set_req(j, phase->C->top()); | |
98 // Update phis of 'region' | |
99 //for( uint k = 0; k < max; k++ ) { | |
100 // Node *phi = region->out(k); | |
101 // if( phi->is_Phi() ) { | |
102 // phi->add_req(phi->in(i)); | |
103 // } | |
104 //} | |
105 | |
106 rreq++; // One more input to Region | |
107 } // Found a region to merge into Region | |
108 // Clobber pointer to the now dead 'r' | |
109 region->set_req(i, phase->C->top()); | |
110 } | |
111 } | |
112 | |
113 return progress; | |
114 } | |
115 | |
116 | |
117 | |
118 //--------------------------------has_phi-------------------------------------- | |
119 // Helper function: Return any PhiNode that uses this region or NULL | |
120 PhiNode* RegionNode::has_phi() const { | |
121 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) { | |
122 Node* phi = fast_out(i); | |
123 if (phi->is_Phi()) { // Check for Phi users | |
124 assert(phi->in(0) == (Node*)this, "phi uses region only via in(0)"); | |
125 return phi->as_Phi(); // this one is good enough | |
126 } | |
127 } | |
128 | |
129 return NULL; | |
130 } | |
131 | |
132 | |
133 //-----------------------------has_unique_phi---------------------------------- | |
134 // Helper function: Return the only PhiNode that uses this region or NULL | |
135 PhiNode* RegionNode::has_unique_phi() const { | |
136 // Check that only one use is a Phi | |
137 PhiNode* only_phi = NULL; | |
138 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) { | |
139 Node* phi = fast_out(i); | |
140 if (phi->is_Phi()) { // Check for Phi users | |
141 assert(phi->in(0) == (Node*)this, "phi uses region only via in(0)"); | |
142 if (only_phi == NULL) { | |
143 only_phi = phi->as_Phi(); | |
144 } else { | |
145 return NULL; // multiple phis | |
146 } | |
147 } | |
148 } | |
149 | |
150 return only_phi; | |
151 } | |
152 | |
153 | |
154 //------------------------------check_phi_clipping----------------------------- | |
155 // Helper function for RegionNode's identification of FP clipping | |
156 // Check inputs to the Phi | |
157 static bool check_phi_clipping( PhiNode *phi, ConNode * &min, uint &min_idx, ConNode * &max, uint &max_idx, Node * &val, uint &val_idx ) { | |
158 min = NULL; | |
159 max = NULL; | |
160 val = NULL; | |
161 min_idx = 0; | |
162 max_idx = 0; | |
163 val_idx = 0; | |
164 uint phi_max = phi->req(); | |
165 if( phi_max == 4 ) { | |
166 for( uint j = 1; j < phi_max; ++j ) { | |
167 Node *n = phi->in(j); | |
168 int opcode = n->Opcode(); | |
169 switch( opcode ) { | |
170 case Op_ConI: | |
171 { | |
172 if( min == NULL ) { | |
173 min = n->Opcode() == Op_ConI ? (ConNode*)n : NULL; | |
174 min_idx = j; | |
175 } else { | |
176 max = n->Opcode() == Op_ConI ? (ConNode*)n : NULL; | |
177 max_idx = j; | |
178 if( min->get_int() > max->get_int() ) { | |
179 // Swap min and max | |
180 ConNode *temp; | |
181 uint temp_idx; | |
182 temp = min; min = max; max = temp; | |
183 temp_idx = min_idx; min_idx = max_idx; max_idx = temp_idx; | |
184 } | |
185 } | |
186 } | |
187 break; | |
188 default: | |
189 { | |
190 val = n; | |
191 val_idx = j; | |
192 } | |
193 break; | |
194 } | |
195 } | |
196 } | |
197 return ( min && max && val && (min->get_int() <= 0) && (max->get_int() >=0) ); | |
198 } | |
199 | |
200 | |
201 //------------------------------check_if_clipping------------------------------ | |
202 // Helper function for RegionNode's identification of FP clipping | |
203 // Check that inputs to Region come from two IfNodes, | |
204 // | |
205 // If | |
206 // False True | |
207 // If | | |
208 // False True | | |
209 // | | | | |
210 // RegionNode_inputs | |
211 // | |
212 static bool check_if_clipping( const RegionNode *region, IfNode * &bot_if, IfNode * &top_if ) { | |
213 top_if = NULL; | |
214 bot_if = NULL; | |
215 | |
216 // Check control structure above RegionNode for (if ( if ) ) | |
217 Node *in1 = region->in(1); | |
218 Node *in2 = region->in(2); | |
219 Node *in3 = region->in(3); | |
220 // Check that all inputs are projections | |
221 if( in1->is_Proj() && in2->is_Proj() && in3->is_Proj() ) { | |
222 Node *in10 = in1->in(0); | |
223 Node *in20 = in2->in(0); | |
224 Node *in30 = in3->in(0); | |
225 // Check that #1 and #2 are ifTrue and ifFalse from same If | |
226 if( in10 != NULL && in10->is_If() && | |
227 in20 != NULL && in20->is_If() && | |
228 in30 != NULL && in30->is_If() && in10 == in20 && | |
229 (in1->Opcode() != in2->Opcode()) ) { | |
230 Node *in100 = in10->in(0); | |
231 Node *in1000 = (in100 != NULL && in100->is_Proj()) ? in100->in(0) : NULL; | |
232 // Check that control for in10 comes from other branch of IF from in3 | |
233 if( in1000 != NULL && in1000->is_If() && | |
234 in30 == in1000 && (in3->Opcode() != in100->Opcode()) ) { | |
235 // Control pattern checks | |
236 top_if = (IfNode*)in1000; | |
237 bot_if = (IfNode*)in10; | |
238 } | |
239 } | |
240 } | |
241 | |
242 return (top_if != NULL); | |
243 } | |
244 | |
245 | |
246 //------------------------------check_convf2i_clipping------------------------- | |
247 // Helper function for RegionNode's identification of FP clipping | |
248 // Verify that the value input to the phi comes from "ConvF2I; LShift; RShift" | |
249 static bool check_convf2i_clipping( PhiNode *phi, uint idx, ConvF2INode * &convf2i, Node *min, Node *max) { | |
250 convf2i = NULL; | |
251 | |
252 // Check for the RShiftNode | |
253 Node *rshift = phi->in(idx); | |
254 assert( rshift, "Previous checks ensure phi input is present"); | |
255 if( rshift->Opcode() != Op_RShiftI ) { return false; } | |
256 | |
257 // Check for the LShiftNode | |
258 Node *lshift = rshift->in(1); | |
259 assert( lshift, "Previous checks ensure phi input is present"); | |
260 if( lshift->Opcode() != Op_LShiftI ) { return false; } | |
261 | |
262 // Check for the ConvF2INode | |
263 Node *conv = lshift->in(1); | |
264 if( conv->Opcode() != Op_ConvF2I ) { return false; } | |
265 | |
266 // Check that shift amounts are only to get sign bits set after F2I | |
267 jint max_cutoff = max->get_int(); | |
268 jint min_cutoff = min->get_int(); | |
269 jint left_shift = lshift->in(2)->get_int(); | |
270 jint right_shift = rshift->in(2)->get_int(); | |
271 jint max_post_shift = nth_bit(BitsPerJavaInteger - left_shift - 1); | |
272 if( left_shift != right_shift || | |
273 0 > left_shift || left_shift >= BitsPerJavaInteger || | |
274 max_post_shift < max_cutoff || | |
275 max_post_shift < -min_cutoff ) { | |
276 // Shifts are necessary but current transformation eliminates them | |
277 return false; | |
278 } | |
279 | |
280 // OK to return the result of ConvF2I without shifting | |
281 convf2i = (ConvF2INode*)conv; | |
282 return true; | |
283 } | |
284 | |
285 | |
286 //------------------------------check_compare_clipping------------------------- | |
287 // Helper function for RegionNode's identification of FP clipping | |
288 static bool check_compare_clipping( bool less_than, IfNode *iff, ConNode *limit, Node * & input ) { | |
289 Node *i1 = iff->in(1); | |
290 if ( !i1->is_Bool() ) { return false; } | |
291 BoolNode *bool1 = i1->as_Bool(); | |
292 if( less_than && bool1->_test._test != BoolTest::le ) { return false; } | |
293 else if( !less_than && bool1->_test._test != BoolTest::lt ) { return false; } | |
294 const Node *cmpF = bool1->in(1); | |
295 if( cmpF->Opcode() != Op_CmpF ) { return false; } | |
296 // Test that the float value being compared against | |
297 // is equivalent to the int value used as a limit | |
298 Node *nodef = cmpF->in(2); | |
299 if( nodef->Opcode() != Op_ConF ) { return false; } | |
300 jfloat conf = nodef->getf(); | |
301 jint coni = limit->get_int(); | |
302 if( ((int)conf) != coni ) { return false; } | |
303 input = cmpF->in(1); | |
304 return true; | |
305 } | |
306 | |
307 //------------------------------is_unreachable_region-------------------------- | |
308 // Find if the Region node is reachable from the root. | |
309 bool RegionNode::is_unreachable_region(PhaseGVN *phase) const { | |
310 assert(req() == 2, ""); | |
311 | |
312 // First, cut the simple case of fallthrough region when NONE of | |
313 // region's phis references itself directly or through a data node. | |
314 uint max = outcnt(); | |
315 uint i; | |
316 for (i = 0; i < max; i++) { | |
317 Node* phi = raw_out(i); | |
318 if (phi != NULL && phi->is_Phi()) { | |
319 assert(phase->eqv(phi->in(0), this) && phi->req() == 2, ""); | |
320 if (phi->outcnt() == 0) | |
321 continue; // Safe case - no loops | |
322 if (phi->outcnt() == 1) { | |
323 Node* u = phi->raw_out(0); | |
324 // Skip if only one use is an other Phi or Call or Uncommon trap. | |
325 // It is safe to consider this case as fallthrough. | |
326 if (u != NULL && (u->is_Phi() || u->is_CFG())) | |
327 continue; | |
328 } | |
329 // Check when phi references itself directly or through an other node. | |
330 if (phi->as_Phi()->simple_data_loop_check(phi->in(1)) >= PhiNode::Unsafe) | |
331 break; // Found possible unsafe data loop. | |
332 } | |
333 } | |
334 if (i >= max) | |
335 return false; // An unsafe case was NOT found - don't need graph walk. | |
336 | |
337 // Unsafe case - check if the Region node is reachable from root. | |
338 ResourceMark rm; | |
339 | |
340 Arena *a = Thread::current()->resource_area(); | |
341 Node_List nstack(a); | |
342 VectorSet visited(a); | |
343 | |
344 // Mark all control nodes reachable from root outputs | |
345 Node *n = (Node*)phase->C->root(); | |
346 nstack.push(n); | |
347 visited.set(n->_idx); | |
348 while (nstack.size() != 0) { | |
349 n = nstack.pop(); | |
350 uint max = n->outcnt(); | |
351 for (uint i = 0; i < max; i++) { | |
352 Node* m = n->raw_out(i); | |
353 if (m != NULL && m->is_CFG()) { | |
354 if (phase->eqv(m, this)) { | |
355 return false; // We reached the Region node - it is not dead. | |
356 } | |
357 if (!visited.test_set(m->_idx)) | |
358 nstack.push(m); | |
359 } | |
360 } | |
361 } | |
362 | |
363 return true; // The Region node is unreachable - it is dead. | |
364 } | |
365 | |
366 //------------------------------Ideal------------------------------------------ | |
367 // Return a node which is more "ideal" than the current node. Must preserve | |
368 // the CFG, but we can still strip out dead paths. | |
369 Node *RegionNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
370 if( !can_reshape && !in(0) ) return NULL; // Already degraded to a Copy | |
371 assert(!in(0) || !in(0)->is_Root(), "not a specially hidden merge"); | |
372 | |
373 // Check for RegionNode with no Phi users and both inputs come from either | |
374 // arm of the same IF. If found, then the control-flow split is useless. | |
375 bool has_phis = false; | |
376 if (can_reshape) { // Need DU info to check for Phi users | |
377 has_phis = (has_phi() != NULL); // Cache result | |
378 if (!has_phis) { // No Phi users? Nothing merging? | |
379 for (uint i = 1; i < req()-1; i++) { | |
380 Node *if1 = in(i); | |
381 if( !if1 ) continue; | |
382 Node *iff = if1->in(0); | |
383 if( !iff || !iff->is_If() ) continue; | |
384 for( uint j=i+1; j<req(); j++ ) { | |
385 if( in(j) && in(j)->in(0) == iff && | |
386 if1->Opcode() != in(j)->Opcode() ) { | |
387 // Add the IF Projections to the worklist. They (and the IF itself) | |
388 // will be eliminated if dead. | |
389 phase->is_IterGVN()->add_users_to_worklist(iff); | |
390 set_req(i, iff->in(0));// Skip around the useless IF diamond | |
391 set_req(j, NULL); | |
392 return this; // Record progress | |
393 } | |
394 } | |
395 } | |
396 } | |
397 } | |
398 | |
399 // Remove TOP or NULL input paths. If only 1 input path remains, this Region | |
400 // degrades to a copy. | |
401 bool add_to_worklist = false; | |
402 int cnt = 0; // Count of values merging | |
403 DEBUG_ONLY( int cnt_orig = req(); ) // Save original inputs count | |
404 int del_it = 0; // The last input path we delete | |
405 // For all inputs... | |
406 for( uint i=1; i<req(); ++i ){// For all paths in | |
407 Node *n = in(i); // Get the input | |
408 if( n != NULL ) { | |
409 // Remove useless control copy inputs | |
410 if( n->is_Region() && n->as_Region()->is_copy() ) { | |
411 set_req(i, n->nonnull_req()); | |
412 i--; | |
413 continue; | |
414 } | |
415 if( n->is_Proj() ) { // Remove useless rethrows | |
416 Node *call = n->in(0); | |
417 if (call->is_Call() && call->as_Call()->entry_point() == OptoRuntime::rethrow_stub()) { | |
418 set_req(i, call->in(0)); | |
419 i--; | |
420 continue; | |
421 } | |
422 } | |
423 if( phase->type(n) == Type::TOP ) { | |
424 set_req(i, NULL); // Ignore TOP inputs | |
425 i--; | |
426 continue; | |
427 } | |
428 cnt++; // One more value merging | |
429 | |
430 } else if (can_reshape) { // Else found dead path with DU info | |
431 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
432 del_req(i); // Yank path from self | |
433 del_it = i; | |
434 uint max = outcnt(); | |
435 DUIterator j; | |
436 bool progress = true; | |
437 while(progress) { // Need to establish property over all users | |
438 progress = false; | |
439 for (j = outs(); has_out(j); j++) { | |
440 Node *n = out(j); | |
441 if( n->req() != req() && n->is_Phi() ) { | |
442 assert( n->in(0) == this, "" ); | |
443 igvn->hash_delete(n); // Yank from hash before hacking edges | |
444 n->set_req_X(i,NULL,igvn);// Correct DU info | |
445 n->del_req(i); // Yank path from Phis | |
446 if( max != outcnt() ) { | |
447 progress = true; | |
448 j = refresh_out_pos(j); | |
449 max = outcnt(); | |
450 } | |
451 } | |
452 } | |
453 } | |
454 add_to_worklist = true; | |
455 i--; | |
456 } | |
457 } | |
458 | |
459 if (can_reshape && cnt == 1) { | |
460 // Is it dead loop? | |
461 // If it is LoopNopde it had 2 (+1 itself) inputs and | |
462 // one of them was cut. The loop is dead if it was EntryContol. | |
4113 | 463 // Loop node may have only one input because entry path |
464 // is removed in PhaseIdealLoop::Dominators(). | |
465 assert(!this->is_Loop() || cnt_orig <= 3, "Loop node should have 3 or less inputs"); | |
466 if (this->is_Loop() && (del_it == LoopNode::EntryControl || | |
467 del_it == 0 && is_unreachable_region(phase)) || | |
0 | 468 !this->is_Loop() && has_phis && is_unreachable_region(phase)) { |
469 // Yes, the region will be removed during the next step below. | |
470 // Cut the backedge input and remove phis since no data paths left. | |
471 // We don't cut outputs to other nodes here since we need to put them | |
472 // on the worklist. | |
473 del_req(1); | |
474 cnt = 0; | |
475 assert( req() == 1, "no more inputs expected" ); | |
476 uint max = outcnt(); | |
477 bool progress = true; | |
478 Node *top = phase->C->top(); | |
479 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
480 DUIterator j; | |
481 while(progress) { | |
482 progress = false; | |
483 for (j = outs(); has_out(j); j++) { | |
484 Node *n = out(j); | |
485 if( n->is_Phi() ) { | |
486 assert( igvn->eqv(n->in(0), this), "" ); | |
487 assert( n->req() == 2 && n->in(1) != NULL, "Only one data input expected" ); | |
488 // Break dead loop data path. | |
489 // Eagerly replace phis with top to avoid phis copies generation. | |
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490 igvn->replace_node(n, top); |
0 | 491 if( max != outcnt() ) { |
492 progress = true; | |
493 j = refresh_out_pos(j); | |
494 max = outcnt(); | |
495 } | |
496 } | |
497 } | |
498 } | |
499 add_to_worklist = true; | |
500 } | |
501 } | |
502 if (add_to_worklist) { | |
503 phase->is_IterGVN()->add_users_to_worklist(this); // Revisit collapsed Phis | |
504 } | |
505 | |
506 if( cnt <= 1 ) { // Only 1 path in? | |
507 set_req(0, NULL); // Null control input for region copy | |
508 if( cnt == 0 && !can_reshape) { // Parse phase - leave the node as it is. | |
509 // No inputs or all inputs are NULL. | |
510 return NULL; | |
511 } else if (can_reshape) { // Optimization phase - remove the node | |
512 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
513 Node *parent_ctrl; | |
514 if( cnt == 0 ) { | |
515 assert( req() == 1, "no inputs expected" ); | |
516 // During IGVN phase such region will be subsumed by TOP node | |
517 // so region's phis will have TOP as control node. | |
518 // Kill phis here to avoid it. PhiNode::is_copy() will be always false. | |
519 // Also set other user's input to top. | |
520 parent_ctrl = phase->C->top(); | |
521 } else { | |
522 // The fallthrough case since we already checked dead loops above. | |
523 parent_ctrl = in(1); | |
524 assert(parent_ctrl != NULL, "Region is a copy of some non-null control"); | |
525 assert(!igvn->eqv(parent_ctrl, this), "Close dead loop"); | |
526 } | |
527 if (!add_to_worklist) | |
528 igvn->add_users_to_worklist(this); // Check for further allowed opts | |
529 for (DUIterator_Last imin, i = last_outs(imin); i >= imin; --i) { | |
530 Node* n = last_out(i); | |
531 igvn->hash_delete(n); // Remove from worklist before modifying edges | |
532 if( n->is_Phi() ) { // Collapse all Phis | |
533 // Eagerly replace phis to avoid copies generation. | |
1621
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534 Node* in; |
0 | 535 if( cnt == 0 ) { |
536 assert( n->req() == 1, "No data inputs expected" ); | |
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537 in = parent_ctrl; // replaced by top |
0 | 538 } else { |
539 assert( n->req() == 2 && n->in(1) != NULL, "Only one data input expected" ); | |
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540 in = n->in(1); // replaced by unique input |
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541 if( n->as_Phi()->is_unsafe_data_reference(in) ) |
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542 in = phase->C->top(); // replaced by top |
0 | 543 } |
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544 igvn->replace_node(n, in); |
0 | 545 } |
546 else if( n->is_Region() ) { // Update all incoming edges | |
547 assert( !igvn->eqv(n, this), "Must be removed from DefUse edges"); | |
548 uint uses_found = 0; | |
549 for( uint k=1; k < n->req(); k++ ) { | |
550 if( n->in(k) == this ) { | |
551 n->set_req(k, parent_ctrl); | |
552 uses_found++; | |
553 } | |
554 } | |
555 if( uses_found > 1 ) { // (--i) done at the end of the loop. | |
556 i -= (uses_found - 1); | |
557 } | |
558 } | |
559 else { | |
560 assert( igvn->eqv(n->in(0), this), "Expect RegionNode to be control parent"); | |
561 n->set_req(0, parent_ctrl); | |
562 } | |
563 #ifdef ASSERT | |
564 for( uint k=0; k < n->req(); k++ ) { | |
565 assert( !igvn->eqv(n->in(k), this), "All uses of RegionNode should be gone"); | |
566 } | |
567 #endif | |
568 } | |
569 // Remove the RegionNode itself from DefUse info | |
570 igvn->remove_dead_node(this); | |
571 return NULL; | |
572 } | |
573 return this; // Record progress | |
574 } | |
575 | |
576 | |
577 // If a Region flows into a Region, merge into one big happy merge. | |
578 if (can_reshape) { | |
579 Node *m = merge_region(this, phase); | |
580 if (m != NULL) return m; | |
581 } | |
582 | |
583 // Check if this region is the root of a clipping idiom on floats | |
584 if( ConvertFloat2IntClipping && can_reshape && req() == 4 ) { | |
585 // Check that only one use is a Phi and that it simplifies to two constants + | |
586 PhiNode* phi = has_unique_phi(); | |
587 if (phi != NULL) { // One Phi user | |
588 // Check inputs to the Phi | |
589 ConNode *min; | |
590 ConNode *max; | |
591 Node *val; | |
592 uint min_idx; | |
593 uint max_idx; | |
594 uint val_idx; | |
595 if( check_phi_clipping( phi, min, min_idx, max, max_idx, val, val_idx ) ) { | |
596 IfNode *top_if; | |
597 IfNode *bot_if; | |
598 if( check_if_clipping( this, bot_if, top_if ) ) { | |
599 // Control pattern checks, now verify compares | |
600 Node *top_in = NULL; // value being compared against | |
601 Node *bot_in = NULL; | |
602 if( check_compare_clipping( true, bot_if, min, bot_in ) && | |
603 check_compare_clipping( false, top_if, max, top_in ) ) { | |
604 if( bot_in == top_in ) { | |
605 PhaseIterGVN *gvn = phase->is_IterGVN(); | |
606 assert( gvn != NULL, "Only had DefUse info in IterGVN"); | |
607 // Only remaining check is that bot_in == top_in == (Phi's val + mods) | |
608 | |
609 // Check for the ConvF2INode | |
610 ConvF2INode *convf2i; | |
611 if( check_convf2i_clipping( phi, val_idx, convf2i, min, max ) && | |
612 convf2i->in(1) == bot_in ) { | |
613 // Matched pattern, including LShiftI; RShiftI, replace with integer compares | |
614 // max test | |
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615 Node *cmp = gvn->register_new_node_with_optimizer(new (phase->C) CmpINode( convf2i, min )); |
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616 Node *boo = gvn->register_new_node_with_optimizer(new (phase->C) BoolNode( cmp, BoolTest::lt )); |
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617 IfNode *iff = (IfNode*)gvn->register_new_node_with_optimizer(new (phase->C) IfNode( top_if->in(0), boo, PROB_UNLIKELY_MAG(5), top_if->_fcnt )); |
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618 Node *if_min= gvn->register_new_node_with_optimizer(new (phase->C) IfTrueNode (iff)); |
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619 Node *ifF = gvn->register_new_node_with_optimizer(new (phase->C) IfFalseNode(iff)); |
0 | 620 // min test |
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621 cmp = gvn->register_new_node_with_optimizer(new (phase->C) CmpINode( convf2i, max )); |
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622 boo = gvn->register_new_node_with_optimizer(new (phase->C) BoolNode( cmp, BoolTest::gt )); |
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623 iff = (IfNode*)gvn->register_new_node_with_optimizer(new (phase->C) IfNode( ifF, boo, PROB_UNLIKELY_MAG(5), bot_if->_fcnt )); |
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624 Node *if_max= gvn->register_new_node_with_optimizer(new (phase->C) IfTrueNode (iff)); |
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625 ifF = gvn->register_new_node_with_optimizer(new (phase->C) IfFalseNode(iff)); |
0 | 626 // update input edges to region node |
627 set_req_X( min_idx, if_min, gvn ); | |
628 set_req_X( max_idx, if_max, gvn ); | |
629 set_req_X( val_idx, ifF, gvn ); | |
630 // remove unnecessary 'LShiftI; RShiftI' idiom | |
631 gvn->hash_delete(phi); | |
632 phi->set_req_X( val_idx, convf2i, gvn ); | |
633 gvn->hash_find_insert(phi); | |
634 // Return transformed region node | |
635 return this; | |
636 } | |
637 } | |
638 } | |
639 } | |
640 } | |
641 } | |
642 } | |
643 | |
644 return NULL; | |
645 } | |
646 | |
647 | |
648 | |
649 const RegMask &RegionNode::out_RegMask() const { | |
650 return RegMask::Empty; | |
651 } | |
652 | |
653 // Find the one non-null required input. RegionNode only | |
654 Node *Node::nonnull_req() const { | |
655 assert( is_Region(), "" ); | |
656 for( uint i = 1; i < _cnt; i++ ) | |
657 if( in(i) ) | |
658 return in(i); | |
659 ShouldNotReachHere(); | |
660 return NULL; | |
661 } | |
662 | |
663 | |
664 //============================================================================= | |
665 // note that these functions assume that the _adr_type field is flattened | |
666 uint PhiNode::hash() const { | |
667 const Type* at = _adr_type; | |
668 return TypeNode::hash() + (at ? at->hash() : 0); | |
669 } | |
670 uint PhiNode::cmp( const Node &n ) const { | |
671 return TypeNode::cmp(n) && _adr_type == ((PhiNode&)n)._adr_type; | |
672 } | |
673 static inline | |
674 const TypePtr* flatten_phi_adr_type(const TypePtr* at) { | |
675 if (at == NULL || at == TypePtr::BOTTOM) return at; | |
676 return Compile::current()->alias_type(at)->adr_type(); | |
677 } | |
678 | |
679 //----------------------------make--------------------------------------------- | |
680 // create a new phi with edges matching r and set (initially) to x | |
681 PhiNode* PhiNode::make(Node* r, Node* x, const Type *t, const TypePtr* at) { | |
682 uint preds = r->req(); // Number of predecessor paths | |
683 assert(t != Type::MEMORY || at == flatten_phi_adr_type(at), "flatten at"); | |
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684 PhiNode* p = new (Compile::current()) PhiNode(r, t, at); |
0 | 685 for (uint j = 1; j < preds; j++) { |
686 // Fill in all inputs, except those which the region does not yet have | |
687 if (r->in(j) != NULL) | |
688 p->init_req(j, x); | |
689 } | |
690 return p; | |
691 } | |
692 PhiNode* PhiNode::make(Node* r, Node* x) { | |
693 const Type* t = x->bottom_type(); | |
694 const TypePtr* at = NULL; | |
695 if (t == Type::MEMORY) at = flatten_phi_adr_type(x->adr_type()); | |
696 return make(r, x, t, at); | |
697 } | |
698 PhiNode* PhiNode::make_blank(Node* r, Node* x) { | |
699 const Type* t = x->bottom_type(); | |
700 const TypePtr* at = NULL; | |
701 if (t == Type::MEMORY) at = flatten_phi_adr_type(x->adr_type()); | |
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702 return new (Compile::current()) PhiNode(r, t, at); |
0 | 703 } |
704 | |
705 | |
706 //------------------------slice_memory----------------------------------------- | |
707 // create a new phi with narrowed memory type | |
708 PhiNode* PhiNode::slice_memory(const TypePtr* adr_type) const { | |
709 PhiNode* mem = (PhiNode*) clone(); | |
710 *(const TypePtr**)&mem->_adr_type = adr_type; | |
711 // convert self-loops, or else we get a bad graph | |
712 for (uint i = 1; i < req(); i++) { | |
713 if ((const Node*)in(i) == this) mem->set_req(i, mem); | |
714 } | |
715 mem->verify_adr_type(); | |
716 return mem; | |
717 } | |
718 | |
74
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719 //------------------------split_out_instance----------------------------------- |
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720 // Split out an instance type from a bottom phi. |
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721 PhiNode* PhiNode::split_out_instance(const TypePtr* at, PhaseIterGVN *igvn) const { |
163 | 722 const TypeOopPtr *t_oop = at->isa_oopptr(); |
223 | 723 assert(t_oop != NULL && t_oop->is_known_instance(), "expecting instance oopptr"); |
163 | 724 const TypePtr *t = adr_type(); |
725 assert(type() == Type::MEMORY && | |
726 (t == TypePtr::BOTTOM || t == TypeRawPtr::BOTTOM || | |
223 | 727 t->isa_oopptr() && !t->is_oopptr()->is_known_instance() && |
247 | 728 t->is_oopptr()->cast_to_exactness(true) |
729 ->is_oopptr()->cast_to_ptr_type(t_oop->ptr()) | |
730 ->is_oopptr()->cast_to_instance_id(t_oop->instance_id()) == t_oop), | |
163 | 731 "bottom or raw memory required"); |
74
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732 |
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733 // Check if an appropriate node already exists. |
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734 Node *region = in(0); |
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735 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) { |
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736 Node* use = region->fast_out(k); |
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737 if( use->is_Phi()) { |
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738 PhiNode *phi2 = use->as_Phi(); |
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739 if (phi2->type() == Type::MEMORY && phi2->adr_type() == at) { |
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740 return phi2; |
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741 } |
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742 } |
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743 } |
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744 Compile *C = igvn->C; |
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745 Arena *a = Thread::current()->resource_area(); |
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746 Node_Array node_map = new Node_Array(a); |
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747 Node_Stack stack(a, C->unique() >> 4); |
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748 PhiNode *nphi = slice_memory(at); |
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749 igvn->register_new_node_with_optimizer( nphi ); |
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750 node_map.map(_idx, nphi); |
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751 stack.push((Node *)this, 1); |
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752 while(!stack.is_empty()) { |
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753 PhiNode *ophi = stack.node()->as_Phi(); |
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754 uint i = stack.index(); |
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755 assert(i >= 1, "not control edge"); |
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756 stack.pop(); |
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757 nphi = node_map[ophi->_idx]->as_Phi(); |
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758 for (; i < ophi->req(); i++) { |
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759 Node *in = ophi->in(i); |
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760 if (in == NULL || igvn->type(in) == Type::TOP) |
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761 continue; |
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762 Node *opt = MemNode::optimize_simple_memory_chain(in, at, igvn); |
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763 PhiNode *optphi = opt->is_Phi() ? opt->as_Phi() : NULL; |
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764 if (optphi != NULL && optphi->adr_type() == TypePtr::BOTTOM) { |
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765 opt = node_map[optphi->_idx]; |
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766 if (opt == NULL) { |
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767 stack.push(ophi, i); |
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768 nphi = optphi->slice_memory(at); |
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769 igvn->register_new_node_with_optimizer( nphi ); |
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770 node_map.map(optphi->_idx, nphi); |
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771 ophi = optphi; |
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772 i = 0; // will get incremented at top of loop |
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773 continue; |
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774 } |
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775 } |
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776 nphi->set_req(i, opt); |
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777 } |
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778 } |
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779 return nphi; |
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780 } |
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781 |
0 | 782 //------------------------verify_adr_type-------------------------------------- |
783 #ifdef ASSERT | |
784 void PhiNode::verify_adr_type(VectorSet& visited, const TypePtr* at) const { | |
785 if (visited.test_set(_idx)) return; //already visited | |
786 | |
787 // recheck constructor invariants: | |
788 verify_adr_type(false); | |
789 | |
790 // recheck local phi/phi consistency: | |
791 assert(_adr_type == at || _adr_type == TypePtr::BOTTOM, | |
792 "adr_type must be consistent across phi nest"); | |
793 | |
794 // walk around | |
795 for (uint i = 1; i < req(); i++) { | |
796 Node* n = in(i); | |
797 if (n == NULL) continue; | |
798 const Node* np = in(i); | |
799 if (np->is_Phi()) { | |
800 np->as_Phi()->verify_adr_type(visited, at); | |
801 } else if (n->bottom_type() == Type::TOP | |
802 || (n->is_Mem() && n->in(MemNode::Address)->bottom_type() == Type::TOP)) { | |
803 // ignore top inputs | |
804 } else { | |
805 const TypePtr* nat = flatten_phi_adr_type(n->adr_type()); | |
806 // recheck phi/non-phi consistency at leaves: | |
807 assert((nat != NULL) == (at != NULL), ""); | |
808 assert(nat == at || nat == TypePtr::BOTTOM, | |
809 "adr_type must be consistent at leaves of phi nest"); | |
810 } | |
811 } | |
812 } | |
813 | |
814 // Verify a whole nest of phis rooted at this one. | |
815 void PhiNode::verify_adr_type(bool recursive) const { | |
816 if (is_error_reported()) return; // muzzle asserts when debugging an error | |
817 if (Node::in_dump()) return; // muzzle asserts when printing | |
818 | |
819 assert((_type == Type::MEMORY) == (_adr_type != NULL), "adr_type for memory phis only"); | |
820 | |
821 if (!VerifyAliases) return; // verify thoroughly only if requested | |
822 | |
823 assert(_adr_type == flatten_phi_adr_type(_adr_type), | |
824 "Phi::adr_type must be pre-normalized"); | |
825 | |
826 if (recursive) { | |
827 VectorSet visited(Thread::current()->resource_area()); | |
828 verify_adr_type(visited, _adr_type); | |
829 } | |
830 } | |
831 #endif | |
832 | |
833 | |
834 //------------------------------Value------------------------------------------ | |
835 // Compute the type of the PhiNode | |
836 const Type *PhiNode::Value( PhaseTransform *phase ) const { | |
837 Node *r = in(0); // RegionNode | |
838 if( !r ) // Copy or dead | |
839 return in(1) ? phase->type(in(1)) : Type::TOP; | |
840 | |
841 // Note: During parsing, phis are often transformed before their regions. | |
842 // This means we have to use type_or_null to defend against untyped regions. | |
843 if( phase->type_or_null(r) == Type::TOP ) // Dead code? | |
844 return Type::TOP; | |
845 | |
846 // Check for trip-counted loop. If so, be smarter. | |
847 CountedLoopNode *l = r->is_CountedLoop() ? r->as_CountedLoop() : NULL; | |
848 if( l && l->can_be_counted_loop(phase) && | |
849 ((const Node*)l->phi() == this) ) { // Trip counted loop! | |
850 // protect against init_trip() or limit() returning NULL | |
851 const Node *init = l->init_trip(); | |
852 const Node *limit = l->limit(); | |
853 if( init != NULL && limit != NULL && l->stride_is_con() ) { | |
854 const TypeInt *lo = init ->bottom_type()->isa_int(); | |
855 const TypeInt *hi = limit->bottom_type()->isa_int(); | |
856 if( lo && hi ) { // Dying loops might have TOP here | |
857 int stride = l->stride_con(); | |
858 if( stride < 0 ) { // Down-counter loop | |
859 const TypeInt *tmp = lo; lo = hi; hi = tmp; | |
860 stride = -stride; | |
861 } | |
862 if( lo->_hi < hi->_lo ) // Reversed endpoints are well defined :-( | |
863 return TypeInt::make(lo->_lo,hi->_hi,3); | |
864 } | |
865 } | |
866 } | |
867 | |
868 // Until we have harmony between classes and interfaces in the type | |
869 // lattice, we must tread carefully around phis which implicitly | |
870 // convert the one to the other. | |
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871 const TypePtr* ttp = _type->make_ptr(); |
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872 const TypeInstPtr* ttip = (ttp != NULL) ? ttp->isa_instptr() : NULL; |
555 | 873 const TypeKlassPtr* ttkp = (ttp != NULL) ? ttp->isa_klassptr() : NULL; |
0 | 874 bool is_intf = false; |
875 if (ttip != NULL) { | |
876 ciKlass* k = ttip->klass(); | |
877 if (k->is_loaded() && k->is_interface()) | |
878 is_intf = true; | |
879 } | |
555 | 880 if (ttkp != NULL) { |
881 ciKlass* k = ttkp->klass(); | |
882 if (k->is_loaded() && k->is_interface()) | |
883 is_intf = true; | |
884 } | |
0 | 885 |
886 // Default case: merge all inputs | |
887 const Type *t = Type::TOP; // Merged type starting value | |
888 for (uint i = 1; i < req(); ++i) {// For all paths in | |
889 // Reachable control path? | |
890 if (r->in(i) && phase->type(r->in(i)) == Type::CONTROL) { | |
891 const Type* ti = phase->type(in(i)); | |
892 // We assume that each input of an interface-valued Phi is a true | |
893 // subtype of that interface. This might not be true of the meet | |
894 // of all the input types. The lattice is not distributive in | |
895 // such cases. Ward off asserts in type.cpp by refusing to do | |
896 // meets between interfaces and proper classes. | |
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897 const TypePtr* tip = ti->make_ptr(); |
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898 const TypeInstPtr* tiip = (tip != NULL) ? tip->isa_instptr() : NULL; |
0 | 899 if (tiip) { |
900 bool ti_is_intf = false; | |
901 ciKlass* k = tiip->klass(); | |
902 if (k->is_loaded() && k->is_interface()) | |
903 ti_is_intf = true; | |
904 if (is_intf != ti_is_intf) | |
905 { t = _type; break; } | |
906 } | |
907 t = t->meet(ti); | |
908 } | |
909 } | |
910 | |
911 // The worst-case type (from ciTypeFlow) should be consistent with "t". | |
912 // That is, we expect that "t->higher_equal(_type)" holds true. | |
913 // There are various exceptions: | |
914 // - Inputs which are phis might in fact be widened unnecessarily. | |
915 // For example, an input might be a widened int while the phi is a short. | |
916 // - Inputs might be BotPtrs but this phi is dependent on a null check, | |
917 // and postCCP has removed the cast which encodes the result of the check. | |
918 // - The type of this phi is an interface, and the inputs are classes. | |
919 // - Value calls on inputs might produce fuzzy results. | |
920 // (Occurrences of this case suggest improvements to Value methods.) | |
921 // | |
922 // It is not possible to see Type::BOTTOM values as phi inputs, | |
923 // because the ciTypeFlow pre-pass produces verifier-quality types. | |
924 const Type* ft = t->filter(_type); // Worst case type | |
925 | |
926 #ifdef ASSERT | |
927 // The following logic has been moved into TypeOopPtr::filter. | |
928 const Type* jt = t->join(_type); | |
929 if( jt->empty() ) { // Emptied out??? | |
930 | |
931 // Check for evil case of 't' being a class and '_type' expecting an | |
932 // interface. This can happen because the bytecodes do not contain | |
933 // enough type info to distinguish a Java-level interface variable | |
934 // from a Java-level object variable. If we meet 2 classes which | |
935 // both implement interface I, but their meet is at 'j/l/O' which | |
936 // doesn't implement I, we have no way to tell if the result should | |
937 // be 'I' or 'j/l/O'. Thus we'll pick 'j/l/O'. If this then flows | |
938 // into a Phi which "knows" it's an Interface type we'll have to | |
939 // uplift the type. | |
940 if( !t->empty() && ttip && ttip->is_loaded() && ttip->klass()->is_interface() ) | |
941 { assert(ft == _type, ""); } // Uplift to interface | |
555 | 942 else if( !t->empty() && ttkp && ttkp->is_loaded() && ttkp->klass()->is_interface() ) |
943 { assert(ft == _type, ""); } // Uplift to interface | |
0 | 944 // Otherwise it's something stupid like non-overlapping int ranges |
945 // found on dying counted loops. | |
946 else | |
947 { assert(ft == Type::TOP, ""); } // Canonical empty value | |
948 } | |
949 | |
950 else { | |
951 | |
952 // If we have an interface-typed Phi and we narrow to a class type, the join | |
953 // should report back the class. However, if we have a J/L/Object | |
954 // class-typed Phi and an interface flows in, it's possible that the meet & | |
955 // join report an interface back out. This isn't possible but happens | |
956 // because the type system doesn't interact well with interfaces. | |
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957 const TypePtr *jtp = jt->make_ptr(); |
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958 const TypeInstPtr *jtip = (jtp != NULL) ? jtp->isa_instptr() : NULL; |
555 | 959 const TypeKlassPtr *jtkp = (jtp != NULL) ? jtp->isa_klassptr() : NULL; |
0 | 960 if( jtip && ttip ) { |
961 if( jtip->is_loaded() && jtip->klass()->is_interface() && | |
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962 ttip->is_loaded() && !ttip->klass()->is_interface() ) { |
0 | 963 // Happens in a CTW of rt.jar, 320-341, no extra flags |
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964 assert(ft == ttip->cast_to_ptr_type(jtip->ptr()) || |
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965 ft->isa_narrowoop() && ft->make_ptr() == ttip->cast_to_ptr_type(jtip->ptr()), ""); |
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966 jt = ft; |
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967 } |
0 | 968 } |
555 | 969 if( jtkp && ttkp ) { |
970 if( jtkp->is_loaded() && jtkp->klass()->is_interface() && | |
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971 !jtkp->klass_is_exact() && // Keep exact interface klass (6894807) |
555 | 972 ttkp->is_loaded() && !ttkp->klass()->is_interface() ) { |
973 assert(ft == ttkp->cast_to_ptr_type(jtkp->ptr()) || | |
974 ft->isa_narrowoop() && ft->make_ptr() == ttkp->cast_to_ptr_type(jtkp->ptr()), ""); | |
975 jt = ft; | |
976 } | |
977 } | |
0 | 978 if (jt != ft && jt->base() == ft->base()) { |
979 if (jt->isa_int() && | |
980 jt->is_int()->_lo == ft->is_int()->_lo && | |
981 jt->is_int()->_hi == ft->is_int()->_hi) | |
982 jt = ft; | |
983 if (jt->isa_long() && | |
984 jt->is_long()->_lo == ft->is_long()->_lo && | |
985 jt->is_long()->_hi == ft->is_long()->_hi) | |
986 jt = ft; | |
987 } | |
988 if (jt != ft) { | |
989 tty->print("merge type: "); t->dump(); tty->cr(); | |
990 tty->print("kill type: "); _type->dump(); tty->cr(); | |
991 tty->print("join type: "); jt->dump(); tty->cr(); | |
992 tty->print("filter type: "); ft->dump(); tty->cr(); | |
993 } | |
994 assert(jt == ft, ""); | |
995 } | |
996 #endif //ASSERT | |
997 | |
998 // Deal with conversion problems found in data loops. | |
999 ft = phase->saturate(ft, phase->type_or_null(this), _type); | |
1000 | |
1001 return ft; | |
1002 } | |
1003 | |
1004 | |
1005 //------------------------------is_diamond_phi--------------------------------- | |
1006 // Does this Phi represent a simple well-shaped diamond merge? Return the | |
1007 // index of the true path or 0 otherwise. | |
1008 int PhiNode::is_diamond_phi() const { | |
1009 // Check for a 2-path merge | |
1010 Node *region = in(0); | |
1011 if( !region ) return 0; | |
1012 if( region->req() != 3 ) return 0; | |
1013 if( req() != 3 ) return 0; | |
1014 // Check that both paths come from the same If | |
1015 Node *ifp1 = region->in(1); | |
1016 Node *ifp2 = region->in(2); | |
1017 if( !ifp1 || !ifp2 ) return 0; | |
1018 Node *iff = ifp1->in(0); | |
1019 if( !iff || !iff->is_If() ) return 0; | |
1020 if( iff != ifp2->in(0) ) return 0; | |
1021 // Check for a proper bool/cmp | |
1022 const Node *b = iff->in(1); | |
1023 if( !b->is_Bool() ) return 0; | |
1024 const Node *cmp = b->in(1); | |
1025 if( !cmp->is_Cmp() ) return 0; | |
1026 | |
1027 // Check for branching opposite expected | |
1028 if( ifp2->Opcode() == Op_IfTrue ) { | |
1029 assert( ifp1->Opcode() == Op_IfFalse, "" ); | |
1030 return 2; | |
1031 } else { | |
1032 assert( ifp1->Opcode() == Op_IfTrue, "" ); | |
1033 return 1; | |
1034 } | |
1035 } | |
1036 | |
1037 //----------------------------check_cmove_id----------------------------------- | |
1038 // Check for CMove'ing a constant after comparing against the constant. | |
1039 // Happens all the time now, since if we compare equality vs a constant in | |
1040 // the parser, we "know" the variable is constant on one path and we force | |
1041 // it. Thus code like "if( x==0 ) {/*EMPTY*/}" ends up inserting a | |
1042 // conditional move: "x = (x==0)?0:x;". Yucko. This fix is slightly more | |
1043 // general in that we don't need constants. Since CMove's are only inserted | |
1044 // in very special circumstances, we do it here on generic Phi's. | |
1045 Node* PhiNode::is_cmove_id(PhaseTransform* phase, int true_path) { | |
1046 assert(true_path !=0, "only diamond shape graph expected"); | |
1047 | |
1048 // is_diamond_phi() has guaranteed the correctness of the nodes sequence: | |
1049 // phi->region->if_proj->ifnode->bool->cmp | |
1050 Node* region = in(0); | |
1051 Node* iff = region->in(1)->in(0); | |
1052 BoolNode* b = iff->in(1)->as_Bool(); | |
1053 Node* cmp = b->in(1); | |
1054 Node* tval = in(true_path); | |
1055 Node* fval = in(3-true_path); | |
1056 Node* id = CMoveNode::is_cmove_id(phase, cmp, tval, fval, b); | |
1057 if (id == NULL) | |
1058 return NULL; | |
1059 | |
1060 // Either value might be a cast that depends on a branch of 'iff'. | |
1061 // Since the 'id' value will float free of the diamond, either | |
1062 // decast or return failure. | |
1063 Node* ctl = id->in(0); | |
1064 if (ctl != NULL && ctl->in(0) == iff) { | |
1065 if (id->is_ConstraintCast()) { | |
1066 return id->in(1); | |
1067 } else { | |
1068 // Don't know how to disentangle this value. | |
1069 return NULL; | |
1070 } | |
1071 } | |
1072 | |
1073 return id; | |
1074 } | |
1075 | |
1076 //------------------------------Identity--------------------------------------- | |
1077 // Check for Region being Identity. | |
1078 Node *PhiNode::Identity( PhaseTransform *phase ) { | |
1079 // Check for no merging going on | |
1080 // (There used to be special-case code here when this->region->is_Loop. | |
1081 // It would check for a tributary phi on the backedge that the main phi | |
1082 // trivially, perhaps with a single cast. The unique_input method | |
1083 // does all this and more, by reducing such tributaries to 'this'.) | |
1084 Node* uin = unique_input(phase); | |
1085 if (uin != NULL) { | |
1086 return uin; | |
1087 } | |
1088 | |
1089 int true_path = is_diamond_phi(); | |
1090 if (true_path != 0) { | |
1091 Node* id = is_cmove_id(phase, true_path); | |
1092 if (id != NULL) return id; | |
1093 } | |
1094 | |
1095 return this; // No identity | |
1096 } | |
1097 | |
1098 //-----------------------------unique_input------------------------------------ | |
1099 // Find the unique value, discounting top, self-loops, and casts. | |
1100 // Return top if there are no inputs, and self if there are multiple. | |
1101 Node* PhiNode::unique_input(PhaseTransform* phase) { | |
1102 // 1) One unique direct input, or | |
1103 // 2) some of the inputs have an intervening ConstraintCast and | |
1104 // the type of input is the same or sharper (more specific) | |
1105 // than the phi's type. | |
1106 // 3) an input is a self loop | |
1107 // | |
1108 // 1) input or 2) input or 3) input __ | |
1109 // / \ / \ \ / \ | |
1110 // \ / | cast phi cast | |
1111 // phi \ / / \ / | |
1112 // phi / -- | |
1113 | |
1114 Node* r = in(0); // RegionNode | |
1115 if (r == NULL) return in(1); // Already degraded to a Copy | |
1116 Node* uncasted_input = NULL; // The unique uncasted input (ConstraintCasts removed) | |
1117 Node* direct_input = NULL; // The unique direct input | |
1118 | |
1119 for (uint i = 1, cnt = req(); i < cnt; ++i) { | |
1120 Node* rc = r->in(i); | |
1121 if (rc == NULL || phase->type(rc) == Type::TOP) | |
1122 continue; // ignore unreachable control path | |
1123 Node* n = in(i); | |
247 | 1124 if (n == NULL) |
1125 continue; | |
0 | 1126 Node* un = n->uncast(); |
1127 if (un == NULL || un == this || phase->type(un) == Type::TOP) { | |
1128 continue; // ignore if top, or in(i) and "this" are in a data cycle | |
1129 } | |
1130 // Check for a unique uncasted input | |
1131 if (uncasted_input == NULL) { | |
1132 uncasted_input = un; | |
1133 } else if (uncasted_input != un) { | |
1134 uncasted_input = NodeSentinel; // no unique uncasted input | |
1135 } | |
1136 // Check for a unique direct input | |
1137 if (direct_input == NULL) { | |
1138 direct_input = n; | |
1139 } else if (direct_input != n) { | |
1140 direct_input = NodeSentinel; // no unique direct input | |
1141 } | |
1142 } | |
1143 if (direct_input == NULL) { | |
1144 return phase->C->top(); // no inputs | |
1145 } | |
1146 assert(uncasted_input != NULL,""); | |
1147 | |
1148 if (direct_input != NodeSentinel) { | |
1149 return direct_input; // one unique direct input | |
1150 } | |
1151 if (uncasted_input != NodeSentinel && | |
1152 phase->type(uncasted_input)->higher_equal(type())) { | |
1153 return uncasted_input; // one unique uncasted input | |
1154 } | |
1155 | |
1156 // Nothing. | |
1157 return NULL; | |
1158 } | |
1159 | |
1160 //------------------------------is_x2logic------------------------------------- | |
1161 // Check for simple convert-to-boolean pattern | |
1162 // If:(C Bool) Region:(IfF IfT) Phi:(Region 0 1) | |
1163 // Convert Phi to an ConvIB. | |
1164 static Node *is_x2logic( PhaseGVN *phase, PhiNode *phi, int true_path ) { | |
1165 assert(true_path !=0, "only diamond shape graph expected"); | |
1166 // Convert the true/false index into an expected 0/1 return. | |
1167 // Map 2->0 and 1->1. | |
1168 int flipped = 2-true_path; | |
1169 | |
1170 // is_diamond_phi() has guaranteed the correctness of the nodes sequence: | |
1171 // phi->region->if_proj->ifnode->bool->cmp | |
1172 Node *region = phi->in(0); | |
1173 Node *iff = region->in(1)->in(0); | |
1174 BoolNode *b = (BoolNode*)iff->in(1); | |
1175 const CmpNode *cmp = (CmpNode*)b->in(1); | |
1176 | |
1177 Node *zero = phi->in(1); | |
1178 Node *one = phi->in(2); | |
1179 const Type *tzero = phase->type( zero ); | |
1180 const Type *tone = phase->type( one ); | |
1181 | |
1182 // Check for compare vs 0 | |
1183 const Type *tcmp = phase->type(cmp->in(2)); | |
1184 if( tcmp != TypeInt::ZERO && tcmp != TypePtr::NULL_PTR ) { | |
1185 // Allow cmp-vs-1 if the other input is bounded by 0-1 | |
1186 if( !(tcmp == TypeInt::ONE && phase->type(cmp->in(1)) == TypeInt::BOOL) ) | |
1187 return NULL; | |
1188 flipped = 1-flipped; // Test is vs 1 instead of 0! | |
1189 } | |
1190 | |
1191 // Check for setting zero/one opposite expected | |
1192 if( tzero == TypeInt::ZERO ) { | |
1193 if( tone == TypeInt::ONE ) { | |
1194 } else return NULL; | |
1195 } else if( tzero == TypeInt::ONE ) { | |
1196 if( tone == TypeInt::ZERO ) { | |
1197 flipped = 1-flipped; | |
1198 } else return NULL; | |
1199 } else return NULL; | |
1200 | |
1201 // Check for boolean test backwards | |
1202 if( b->_test._test == BoolTest::ne ) { | |
1203 } else if( b->_test._test == BoolTest::eq ) { | |
1204 flipped = 1-flipped; | |
1205 } else return NULL; | |
1206 | |
1207 // Build int->bool conversion | |
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1208 Node *n = new (phase->C) Conv2BNode( cmp->in(1) ); |
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1210 n = new (phase->C) XorINode( phase->transform(n), phase->intcon(1) ); |
0 | 1211 |
1212 return n; | |
1213 } | |
1214 | |
1215 //------------------------------is_cond_add------------------------------------ | |
1216 // Check for simple conditional add pattern: "(P < Q) ? X+Y : X;" | |
1217 // To be profitable the control flow has to disappear; there can be no other | |
1218 // values merging here. We replace the test-and-branch with: | |
1219 // "(sgn(P-Q))&Y) + X". Basically, convert "(P < Q)" into 0 or -1 by | |
1220 // moving the carry bit from (P-Q) into a register with 'sbb EAX,EAX'. | |
1221 // Then convert Y to 0-or-Y and finally add. | |
1222 // This is a key transform for SpecJava _201_compress. | |
1223 static Node* is_cond_add(PhaseGVN *phase, PhiNode *phi, int true_path) { | |
1224 assert(true_path !=0, "only diamond shape graph expected"); | |
1225 | |
1226 // is_diamond_phi() has guaranteed the correctness of the nodes sequence: | |
1227 // phi->region->if_proj->ifnode->bool->cmp | |
1228 RegionNode *region = (RegionNode*)phi->in(0); | |
1229 Node *iff = region->in(1)->in(0); | |
1230 BoolNode* b = iff->in(1)->as_Bool(); | |
1231 const CmpNode *cmp = (CmpNode*)b->in(1); | |
1232 | |
1233 // Make sure only merging this one phi here | |
1234 if (region->has_unique_phi() != phi) return NULL; | |
1235 | |
1236 // Make sure each arm of the diamond has exactly one output, which we assume | |
1237 // is the region. Otherwise, the control flow won't disappear. | |
1238 if (region->in(1)->outcnt() != 1) return NULL; | |
1239 if (region->in(2)->outcnt() != 1) return NULL; | |
1240 | |
1241 // Check for "(P < Q)" of type signed int | |
1242 if (b->_test._test != BoolTest::lt) return NULL; | |
1243 if (cmp->Opcode() != Op_CmpI) return NULL; | |
1244 | |
1245 Node *p = cmp->in(1); | |
1246 Node *q = cmp->in(2); | |
1247 Node *n1 = phi->in( true_path); | |
1248 Node *n2 = phi->in(3-true_path); | |
1249 | |
1250 int op = n1->Opcode(); | |
1251 if( op != Op_AddI // Need zero as additive identity | |
1252 /*&&op != Op_SubI && | |
1253 op != Op_AddP && | |
1254 op != Op_XorI && | |
1255 op != Op_OrI*/ ) | |
1256 return NULL; | |
1257 | |
1258 Node *x = n2; | |
1259 Node *y = n1->in(1); | |
1260 if( n2 == n1->in(1) ) { | |
1261 y = n1->in(2); | |
1262 } else if( n2 == n1->in(1) ) { | |
1263 } else return NULL; | |
1264 | |
1265 // Not so profitable if compare and add are constants | |
1266 if( q->is_Con() && phase->type(q) != TypeInt::ZERO && y->is_Con() ) | |
1267 return NULL; | |
1268 | |
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1269 Node *cmplt = phase->transform( new (phase->C) CmpLTMaskNode(p,q) ); |
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1270 Node *j_and = phase->transform( new (phase->C) AndINode(cmplt,y) ); |
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1271 return new (phase->C) AddINode(j_and,x); |
0 | 1272 } |
1273 | |
1274 //------------------------------is_absolute------------------------------------ | |
1275 // Check for absolute value. | |
1276 static Node* is_absolute( PhaseGVN *phase, PhiNode *phi_root, int true_path) { | |
1277 assert(true_path !=0, "only diamond shape graph expected"); | |
1278 | |
1279 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
1280 int phi_x_idx = 0; // Index of phi input where to find naked x | |
1281 | |
1282 // ABS ends with the merge of 2 control flow paths. | |
1283 // Find the false path from the true path. With only 2 inputs, 3 - x works nicely. | |
1284 int false_path = 3 - true_path; | |
1285 | |
1286 // is_diamond_phi() has guaranteed the correctness of the nodes sequence: | |
1287 // phi->region->if_proj->ifnode->bool->cmp | |
1288 BoolNode *bol = phi_root->in(0)->in(1)->in(0)->in(1)->as_Bool(); | |
1289 | |
1290 // Check bool sense | |
1291 switch( bol->_test._test ) { | |
1292 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = true_path; break; | |
1293 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = false_path; break; | |
1294 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = true_path; break; | |
1295 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = false_path; break; | |
1296 default: return NULL; break; | |
1297 } | |
1298 | |
1299 // Test is next | |
1300 Node *cmp = bol->in(1); | |
1301 const Type *tzero = NULL; | |
1302 switch( cmp->Opcode() ) { | |
1303 case Op_CmpF: tzero = TypeF::ZERO; break; // Float ABS | |
1304 case Op_CmpD: tzero = TypeD::ZERO; break; // Double ABS | |
1305 default: return NULL; | |
1306 } | |
1307 | |
1308 // Find zero input of compare; the other input is being abs'd | |
1309 Node *x = NULL; | |
1310 bool flip = false; | |
1311 if( phase->type(cmp->in(cmp_zero_idx)) == tzero ) { | |
1312 x = cmp->in(3 - cmp_zero_idx); | |
1313 } else if( phase->type(cmp->in(3 - cmp_zero_idx)) == tzero ) { | |
1314 // The test is inverted, we should invert the result... | |
1315 x = cmp->in(cmp_zero_idx); | |
1316 flip = true; | |
1317 } else { | |
1318 return NULL; | |
1319 } | |
1320 | |
1321 // Next get the 2 pieces being selected, one is the original value | |
1322 // and the other is the negated value. | |
1323 if( phi_root->in(phi_x_idx) != x ) return NULL; | |
1324 | |
1325 // Check other phi input for subtract node | |
1326 Node *sub = phi_root->in(3 - phi_x_idx); | |
1327 | |
1328 // Allow only Sub(0,X) and fail out for all others; Neg is not OK | |
1329 if( tzero == TypeF::ZERO ) { | |
1330 if( sub->Opcode() != Op_SubF || | |
1331 sub->in(2) != x || | |
1332 phase->type(sub->in(1)) != tzero ) return NULL; | |
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1333 x = new (phase->C) AbsFNode(x); |
0 | 1334 if (flip) { |
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1335 x = new (phase->C) SubFNode(sub->in(1), phase->transform(x)); |
0 | 1336 } |
1337 } else { | |
1338 if( sub->Opcode() != Op_SubD || | |
1339 sub->in(2) != x || | |
1340 phase->type(sub->in(1)) != tzero ) return NULL; | |
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1341 x = new (phase->C) AbsDNode(x); |
0 | 1342 if (flip) { |
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1343 x = new (phase->C) SubDNode(sub->in(1), phase->transform(x)); |
0 | 1344 } |
1345 } | |
1346 | |
1347 return x; | |
1348 } | |
1349 | |
1350 //------------------------------split_once------------------------------------- | |
1351 // Helper for split_flow_path | |
1352 static void split_once(PhaseIterGVN *igvn, Node *phi, Node *val, Node *n, Node *newn) { | |
1353 igvn->hash_delete(n); // Remove from hash before hacking edges | |
1354 | |
1355 uint j = 1; | |
2445 | 1356 for (uint i = phi->req()-1; i > 0; i--) { |
1357 if (phi->in(i) == val) { // Found a path with val? | |
0 | 1358 // Add to NEW Region/Phi, no DU info |
1359 newn->set_req( j++, n->in(i) ); | |
1360 // Remove from OLD Region/Phi | |
1361 n->del_req(i); | |
1362 } | |
1363 } | |
1364 | |
1365 // Register the new node but do not transform it. Cannot transform until the | |
605 | 1366 // entire Region/Phi conglomerate has been hacked as a single huge transform. |
0 | 1367 igvn->register_new_node_with_optimizer( newn ); |
2445 | 1368 |
0 | 1369 // Now I can point to the new node. |
1370 n->add_req(newn); | |
1371 igvn->_worklist.push(n); | |
1372 } | |
1373 | |
1374 //------------------------------split_flow_path-------------------------------- | |
1375 // Check for merging identical values and split flow paths | |
1376 static Node* split_flow_path(PhaseGVN *phase, PhiNode *phi) { | |
1377 BasicType bt = phi->type()->basic_type(); | |
1378 if( bt == T_ILLEGAL || type2size[bt] <= 0 ) | |
1379 return NULL; // Bail out on funny non-value stuff | |
1380 if( phi->req() <= 3 ) // Need at least 2 matched inputs and a | |
1381 return NULL; // third unequal input to be worth doing | |
1382 | |
1383 // Scan for a constant | |
1384 uint i; | |
1385 for( i = 1; i < phi->req()-1; i++ ) { | |
1386 Node *n = phi->in(i); | |
1387 if( !n ) return NULL; | |
1388 if( phase->type(n) == Type::TOP ) return NULL; | |
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1389 if( n->Opcode() == Op_ConP || n->Opcode() == Op_ConN || n->Opcode() == Op_ConNKlass ) |
0 | 1390 break; |
1391 } | |
1392 if( i >= phi->req() ) // Only split for constants | |
1393 return NULL; | |
1394 | |
1395 Node *val = phi->in(i); // Constant to split for | |
1396 uint hit = 0; // Number of times it occurs | |
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1397 Node *r = phi->region(); |
0 | 1398 |
605 | 1399 for( ; i < phi->req(); i++ ){ // Count occurrences of constant |
0 | 1400 Node *n = phi->in(i); |
1401 if( !n ) return NULL; | |
1402 if( phase->type(n) == Type::TOP ) return NULL; | |
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1403 if( phi->in(i) == val ) { |
0 | 1404 hit++; |
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1405 if (PhaseIdealLoop::find_predicate(r->in(i)) != NULL) { |
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1406 return NULL; // don't split loop entry path |
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1407 } |
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1408 } |
0 | 1409 } |
1410 | |
1411 if( hit <= 1 || // Make sure we find 2 or more | |
1412 hit == phi->req()-1 ) // and not ALL the same value | |
1413 return NULL; | |
1414 | |
1415 // Now start splitting out the flow paths that merge the same value. | |
1416 // Split first the RegionNode. | |
1417 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
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1418 RegionNode *newr = new (phase->C) RegionNode(hit+1); |
0 | 1419 split_once(igvn, phi, val, r, newr); |
1420 | |
1421 // Now split all other Phis than this one | |
1422 for (DUIterator_Fast kmax, k = r->fast_outs(kmax); k < kmax; k++) { | |
1423 Node* phi2 = r->fast_out(k); | |
1424 if( phi2->is_Phi() && phi2->as_Phi() != phi ) { | |
1425 PhiNode *newphi = PhiNode::make_blank(newr, phi2); | |
1426 split_once(igvn, phi, val, phi2, newphi); | |
1427 } | |
1428 } | |
1429 | |
1430 // Clean up this guy | |
1431 igvn->hash_delete(phi); | |
1432 for( i = phi->req()-1; i > 0; i-- ) { | |
1433 if( phi->in(i) == val ) { | |
1434 phi->del_req(i); | |
1435 } | |
1436 } | |
1437 phi->add_req(val); | |
1438 | |
1439 return phi; | |
1440 } | |
1441 | |
1442 //============================================================================= | |
1443 //------------------------------simple_data_loop_check------------------------- | |
605 | 1444 // Try to determining if the phi node in a simple safe/unsafe data loop. |
0 | 1445 // Returns: |
1446 // enum LoopSafety { Safe = 0, Unsafe, UnsafeLoop }; | |
1447 // Safe - safe case when the phi and it's inputs reference only safe data | |
1448 // nodes; | |
1449 // Unsafe - the phi and it's inputs reference unsafe data nodes but there | |
1450 // is no reference back to the phi - need a graph walk | |
1451 // to determine if it is in a loop; | |
1452 // UnsafeLoop - unsafe case when the phi references itself directly or through | |
1453 // unsafe data node. | |
1454 // Note: a safe data node is a node which could/never reference itself during | |
1455 // GVN transformations. For now it is Con, Proj, Phi, CastPP, CheckCastPP. | |
1456 // I mark Phi nodes as safe node not only because they can reference itself | |
1457 // but also to prevent mistaking the fallthrough case inside an outer loop | |
1458 // as dead loop when the phi references itselfs through an other phi. | |
1459 PhiNode::LoopSafety PhiNode::simple_data_loop_check(Node *in) const { | |
1460 // It is unsafe loop if the phi node references itself directly. | |
1461 if (in == (Node*)this) | |
1462 return UnsafeLoop; // Unsafe loop | |
1463 // Unsafe loop if the phi node references itself through an unsafe data node. | |
1464 // Exclude cases with null inputs or data nodes which could reference | |
1465 // itself (safe for dead loops). | |
1466 if (in != NULL && !in->is_dead_loop_safe()) { | |
1467 // Check inputs of phi's inputs also. | |
1468 // It is much less expensive then full graph walk. | |
1469 uint cnt = in->req(); | |
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1470 uint i = (in->is_Proj() && !in->is_CFG()) ? 0 : 1; |
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1471 for (; i < cnt; ++i) { |
0 | 1472 Node* m = in->in(i); |
1473 if (m == (Node*)this) | |
1474 return UnsafeLoop; // Unsafe loop | |
1475 if (m != NULL && !m->is_dead_loop_safe()) { | |
1476 // Check the most common case (about 30% of all cases): | |
1477 // phi->Load/Store->AddP->(ConP ConP Con)/(Parm Parm Con). | |
1478 Node *m1 = (m->is_AddP() && m->req() > 3) ? m->in(1) : NULL; | |
1479 if (m1 == (Node*)this) | |
1480 return UnsafeLoop; // Unsafe loop | |
1481 if (m1 != NULL && m1 == m->in(2) && | |
1482 m1->is_dead_loop_safe() && m->in(3)->is_Con()) { | |
1483 continue; // Safe case | |
1484 } | |
1485 // The phi references an unsafe node - need full analysis. | |
1486 return Unsafe; | |
1487 } | |
1488 } | |
1489 } | |
1490 return Safe; // Safe case - we can optimize the phi node. | |
1491 } | |
1492 | |
1493 //------------------------------is_unsafe_data_reference----------------------- | |
1494 // If phi can be reached through the data input - it is data loop. | |
1495 bool PhiNode::is_unsafe_data_reference(Node *in) const { | |
1496 assert(req() > 1, ""); | |
1497 // First, check simple cases when phi references itself directly or | |
1498 // through an other node. | |
1499 LoopSafety safety = simple_data_loop_check(in); | |
1500 if (safety == UnsafeLoop) | |
1501 return true; // phi references itself - unsafe loop | |
1502 else if (safety == Safe) | |
1503 return false; // Safe case - phi could be replaced with the unique input. | |
1504 | |
1505 // Unsafe case when we should go through data graph to determine | |
1506 // if the phi references itself. | |
1507 | |
1508 ResourceMark rm; | |
1509 | |
1510 Arena *a = Thread::current()->resource_area(); | |
1511 Node_List nstack(a); | |
1512 VectorSet visited(a); | |
1513 | |
1514 nstack.push(in); // Start with unique input. | |
1515 visited.set(in->_idx); | |
1516 while (nstack.size() != 0) { | |
1517 Node* n = nstack.pop(); | |
1518 uint cnt = n->req(); | |
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1519 uint i = (n->is_Proj() && !n->is_CFG()) ? 0 : 1; |
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1520 for (; i < cnt; i++) { |
0 | 1521 Node* m = n->in(i); |
1522 if (m == (Node*)this) { | |
1523 return true; // Data loop | |
1524 } | |
1525 if (m != NULL && !m->is_dead_loop_safe()) { // Only look for unsafe cases. | |
1526 if (!visited.test_set(m->_idx)) | |
1527 nstack.push(m); | |
1528 } | |
1529 } | |
1530 } | |
1531 return false; // The phi is not reachable from its inputs | |
1532 } | |
1533 | |
1534 | |
1535 //------------------------------Ideal------------------------------------------ | |
1536 // Return a node which is more "ideal" than the current node. Must preserve | |
1537 // the CFG, but we can still strip out dead paths. | |
1538 Node *PhiNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1539 // The next should never happen after 6297035 fix. | |
1540 if( is_copy() ) // Already degraded to a Copy ? | |
1541 return NULL; // No change | |
1542 | |
1543 Node *r = in(0); // RegionNode | |
1544 assert(r->in(0) == NULL || !r->in(0)->is_Root(), "not a specially hidden merge"); | |
1545 | |
1546 // Note: During parsing, phis are often transformed before their regions. | |
1547 // This means we have to use type_or_null to defend against untyped regions. | |
1548 if( phase->type_or_null(r) == Type::TOP ) // Dead code? | |
1549 return NULL; // No change | |
1550 | |
1551 Node *top = phase->C->top(); | |
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1552 bool new_phi = (outcnt() == 0); // transforming new Phi |
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1553 // No change for igvn if new phi is not hooked |
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1554 if (new_phi && can_reshape) |
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1555 return NULL; |
0 | 1556 |
1557 // The are 2 situations when only one valid phi's input is left | |
1558 // (in addition to Region input). | |
1559 // One: region is not loop - replace phi with this input. | |
1560 // Two: region is loop - replace phi with top since this data path is dead | |
1561 // and we need to break the dead data loop. | |
1562 Node* progress = NULL; // Record if any progress made | |
1563 for( uint j = 1; j < req(); ++j ){ // For all paths in | |
1564 // Check unreachable control paths | |
1565 Node* rc = r->in(j); | |
1566 Node* n = in(j); // Get the input | |
1567 if (rc == NULL || phase->type(rc) == Type::TOP) { | |
1568 if (n != top) { // Not already top? | |
1569 set_req(j, top); // Nuke it down | |
1570 progress = this; // Record progress | |
1571 } | |
1572 } | |
1573 } | |
1574 | |
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1575 if (can_reshape && outcnt() == 0) { |
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1576 // set_req() above may kill outputs if Phi is referenced |
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1577 // only by itself on the dead (top) control path. |
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1578 return top; |
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1579 } |
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1580 |
0 | 1581 Node* uin = unique_input(phase); |
1582 if (uin == top) { // Simplest case: no alive inputs. | |
1583 if (can_reshape) // IGVN transformation | |
1584 return top; | |
1585 else | |
1586 return NULL; // Identity will return TOP | |
1587 } else if (uin != NULL) { | |
1588 // Only one not-NULL unique input path is left. | |
1589 // Determine if this input is backedge of a loop. | |
1590 // (Skip new phis which have no uses and dead regions). | |
4113 | 1591 if (outcnt() > 0 && r->in(0) != NULL) { |
0 | 1592 // First, take the short cut when we know it is a loop and |
1593 // the EntryControl data path is dead. | |
4113 | 1594 // Loop node may have only one input because entry path |
1595 // is removed in PhaseIdealLoop::Dominators(). | |
1596 assert(!r->is_Loop() || r->req() <= 3, "Loop node should have 3 or less inputs"); | |
1597 bool is_loop = (r->is_Loop() && r->req() == 3); | |
0 | 1598 // Then, check if there is a data loop when phi references itself directly |
1599 // or through other data nodes. | |
4778 | 1600 if (is_loop && !uin->eqv_uncast(in(LoopNode::EntryControl)) || |
4113 | 1601 !is_loop && is_unsafe_data_reference(uin)) { |
0 | 1602 // Break this data loop to avoid creation of a dead loop. |
1603 if (can_reshape) { | |
1604 return top; | |
1605 } else { | |
1606 // We can't return top if we are in Parse phase - cut inputs only | |
1607 // let Identity to handle the case. | |
1608 replace_edge(uin, top); | |
1609 return NULL; | |
1610 } | |
1611 } | |
1612 } | |
1613 | |
1614 // One unique input. | |
1615 debug_only(Node* ident = Identity(phase)); | |
1616 // The unique input must eventually be detected by the Identity call. | |
1617 #ifdef ASSERT | |
1618 if (ident != uin && !ident->is_top()) { | |
1619 // print this output before failing assert | |
1620 r->dump(3); | |
1621 this->dump(3); | |
1622 ident->dump(); | |
1623 uin->dump(); | |
1624 } | |
1625 #endif | |
1626 assert(ident == uin || ident->is_top(), "Identity must clean this up"); | |
1627 return NULL; | |
1628 } | |
1629 | |
1630 | |
1631 Node* opt = NULL; | |
1632 int true_path = is_diamond_phi(); | |
1633 if( true_path != 0 ) { | |
1634 // Check for CMove'ing identity. If it would be unsafe, | |
1635 // handle it here. In the safe case, let Identity handle it. | |
1636 Node* unsafe_id = is_cmove_id(phase, true_path); | |
1637 if( unsafe_id != NULL && is_unsafe_data_reference(unsafe_id) ) | |
1638 opt = unsafe_id; | |
1639 | |
1640 // Check for simple convert-to-boolean pattern | |
1641 if( opt == NULL ) | |
1642 opt = is_x2logic(phase, this, true_path); | |
1643 | |
1644 // Check for absolute value | |
1645 if( opt == NULL ) | |
1646 opt = is_absolute(phase, this, true_path); | |
1647 | |
1648 // Check for conditional add | |
1649 if( opt == NULL && can_reshape ) | |
1650 opt = is_cond_add(phase, this, true_path); | |
1651 | |
1652 // These 4 optimizations could subsume the phi: | |
1653 // have to check for a dead data loop creation. | |
1654 if( opt != NULL ) { | |
1655 if( opt == unsafe_id || is_unsafe_data_reference(opt) ) { | |
1656 // Found dead loop. | |
1657 if( can_reshape ) | |
1658 return top; | |
1659 // We can't return top if we are in Parse phase - cut inputs only | |
1660 // to stop further optimizations for this phi. Identity will return TOP. | |
1661 assert(req() == 3, "only diamond merge phi here"); | |
1662 set_req(1, top); | |
1663 set_req(2, top); | |
1664 return NULL; | |
1665 } else { | |
1666 return opt; | |
1667 } | |
1668 } | |
1669 } | |
1670 | |
1671 // Check for merging identical values and split flow paths | |
1672 if (can_reshape) { | |
1673 opt = split_flow_path(phase, this); | |
1674 // This optimization only modifies phi - don't need to check for dead loop. | |
1675 assert(opt == NULL || phase->eqv(opt, this), "do not elide phi"); | |
1676 if (opt != NULL) return opt; | |
1677 } | |
1678 | |
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1679 if (in(1) != NULL && in(1)->Opcode() == Op_AddP && can_reshape) { |
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1680 // Try to undo Phi of AddP: |
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1681 // (Phi (AddP base base y) (AddP base2 base2 y)) |
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1682 // becomes: |
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1683 // newbase := (Phi base base2) |
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1684 // (AddP newbase newbase y) |
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1685 // |
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1686 // This occurs as a result of unsuccessful split_thru_phi and |
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1687 // interferes with taking advantage of addressing modes. See the |
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1688 // clone_shift_expressions code in matcher.cpp |
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1689 Node* addp = in(1); |
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1690 const Type* type = addp->in(AddPNode::Base)->bottom_type(); |
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1691 Node* y = addp->in(AddPNode::Offset); |
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1692 if (y != NULL && addp->in(AddPNode::Base) == addp->in(AddPNode::Address)) { |
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1693 // make sure that all the inputs are similar to the first one, |
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1694 // i.e. AddP with base == address and same offset as first AddP |
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1695 bool doit = true; |
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1696 for (uint i = 2; i < req(); i++) { |
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1697 if (in(i) == NULL || |
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1698 in(i)->Opcode() != Op_AddP || |
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1699 in(i)->in(AddPNode::Base) != in(i)->in(AddPNode::Address) || |
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1700 in(i)->in(AddPNode::Offset) != y) { |
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1701 doit = false; |
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1702 break; |
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|
1703 } |
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1704 // Accumulate type for resulting Phi |
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1705 type = type->meet(in(i)->in(AddPNode::Base)->bottom_type()); |
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1706 } |
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1707 Node* base = NULL; |
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1708 if (doit) { |
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1709 // Check for neighboring AddP nodes in a tree. |
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1710 // If they have a base, use that it. |
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1711 for (DUIterator_Fast kmax, k = this->fast_outs(kmax); k < kmax; k++) { |
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1712 Node* u = this->fast_out(k); |
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1713 if (u->is_AddP()) { |
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1714 Node* base2 = u->in(AddPNode::Base); |
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1715 if (base2 != NULL && !base2->is_top()) { |
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1716 if (base == NULL) |
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1717 base = base2; |
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1718 else if (base != base2) |
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1719 { doit = false; break; } |
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1720 } |
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1721 } |
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1722 } |
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1723 } |
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1724 if (doit) { |
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1725 if (base == NULL) { |
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1726 base = new (phase->C) PhiNode(in(0), type, NULL); |
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1727 for (uint i = 1; i < req(); i++) { |
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1728 base->init_req(i, in(i)->in(AddPNode::Base)); |
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1729 } |
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1730 phase->is_IterGVN()->register_new_node_with_optimizer(base); |
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1731 } |
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1732 return new (phase->C) AddPNode(base, base, y); |
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1733 } |
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1734 } |
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1735 } |
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1736 |
0 | 1737 // Split phis through memory merges, so that the memory merges will go away. |
1738 // Piggy-back this transformation on the search for a unique input.... | |
1739 // It will be as if the merged memory is the unique value of the phi. | |
1740 // (Do not attempt this optimization unless parsing is complete. | |
1741 // It would make the parser's memory-merge logic sick.) | |
1742 // (MergeMemNode is not dead_loop_safe - need to check for dead loop.) | |
1743 if (progress == NULL && can_reshape && type() == Type::MEMORY) { | |
1744 // see if this phi should be sliced | |
1745 uint merge_width = 0; | |
1746 bool saw_self = false; | |
1747 for( uint i=1; i<req(); ++i ) {// For all paths in | |
1748 Node *ii = in(i); | |
1749 if (ii->is_MergeMem()) { | |
1750 MergeMemNode* n = ii->as_MergeMem(); | |
1751 merge_width = MAX2(merge_width, n->req()); | |
1752 saw_self = saw_self || phase->eqv(n->base_memory(), this); | |
1753 } | |
1754 } | |
1755 | |
1756 // This restriction is temporarily necessary to ensure termination: | |
1757 if (!saw_self && adr_type() == TypePtr::BOTTOM) merge_width = 0; | |
1758 | |
1759 if (merge_width > Compile::AliasIdxRaw) { | |
1760 // found at least one non-empty MergeMem | |
1761 const TypePtr* at = adr_type(); | |
1762 if (at != TypePtr::BOTTOM) { | |
1763 // Patch the existing phi to select an input from the merge: | |
1764 // Phi:AT1(...MergeMem(m0, m1, m2)...) into | |
1765 // Phi:AT1(...m1...) | |
1766 int alias_idx = phase->C->get_alias_index(at); | |
1767 for (uint i=1; i<req(); ++i) { | |
1768 Node *ii = in(i); | |
1769 if (ii->is_MergeMem()) { | |
1770 MergeMemNode* n = ii->as_MergeMem(); | |
1771 // compress paths and change unreachable cycles to TOP | |
1772 // If not, we can update the input infinitely along a MergeMem cycle | |
1773 // Equivalent code is in MemNode::Ideal_common | |
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1774 Node *m = phase->transform(n); |
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1775 if (outcnt() == 0) { // Above transform() may kill us! |
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1776 return top; |
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1777 } |
605 | 1778 // If transformed to a MergeMem, get the desired slice |
0 | 1779 // Otherwise the returned node represents memory for every slice |
1780 Node *new_mem = (m->is_MergeMem()) ? | |
1781 m->as_MergeMem()->memory_at(alias_idx) : m; | |
1782 // Update input if it is progress over what we have now | |
1783 if (new_mem != ii) { | |
1784 set_req(i, new_mem); | |
1785 progress = this; | |
1786 } | |
1787 } | |
1788 } | |
1789 } else { | |
1790 // We know that at least one MergeMem->base_memory() == this | |
1791 // (saw_self == true). If all other inputs also references this phi | |
1792 // (directly or through data nodes) - it is dead loop. | |
1793 bool saw_safe_input = false; | |
1794 for (uint j = 1; j < req(); ++j) { | |
1795 Node *n = in(j); | |
1796 if (n->is_MergeMem() && n->as_MergeMem()->base_memory() == this) | |
1797 continue; // skip known cases | |
1798 if (!is_unsafe_data_reference(n)) { | |
1799 saw_safe_input = true; // found safe input | |
1800 break; | |
1801 } | |
1802 } | |
1803 if (!saw_safe_input) | |
1804 return top; // all inputs reference back to this phi - dead loop | |
1805 | |
1806 // Phi(...MergeMem(m0, m1:AT1, m2:AT2)...) into | |
1807 // MergeMem(Phi(...m0...), Phi:AT1(...m1...), Phi:AT2(...m2...)) | |
1808 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
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1809 Node* hook = new (phase->C) Node(1); |
0 | 1810 PhiNode* new_base = (PhiNode*) clone(); |
1811 // Must eagerly register phis, since they participate in loops. | |
1812 if (igvn) { | |
1813 igvn->register_new_node_with_optimizer(new_base); | |
1814 hook->add_req(new_base); | |
1815 } | |
1816 MergeMemNode* result = MergeMemNode::make(phase->C, new_base); | |
1817 for (uint i = 1; i < req(); ++i) { | |
1818 Node *ii = in(i); | |
1819 if (ii->is_MergeMem()) { | |
1820 MergeMemNode* n = ii->as_MergeMem(); | |
1821 for (MergeMemStream mms(result, n); mms.next_non_empty2(); ) { | |
1822 // If we have not seen this slice yet, make a phi for it. | |
1823 bool made_new_phi = false; | |
1824 if (mms.is_empty()) { | |
1825 Node* new_phi = new_base->slice_memory(mms.adr_type(phase->C)); | |
1826 made_new_phi = true; | |
1827 if (igvn) { | |
1828 igvn->register_new_node_with_optimizer(new_phi); | |
1829 hook->add_req(new_phi); | |
1830 } | |
1831 mms.set_memory(new_phi); | |
1832 } | |
1833 Node* phi = mms.memory(); | |
1834 assert(made_new_phi || phi->in(i) == n, "replace the i-th merge by a slice"); | |
1835 phi->set_req(i, mms.memory2()); | |
1836 } | |
1837 } | |
1838 } | |
1839 // Distribute all self-loops. | |
1840 { // (Extra braces to hide mms.) | |
1841 for (MergeMemStream mms(result); mms.next_non_empty(); ) { | |
1842 Node* phi = mms.memory(); | |
1843 for (uint i = 1; i < req(); ++i) { | |
1844 if (phi->in(i) == this) phi->set_req(i, phi); | |
1845 } | |
1846 } | |
1847 } | |
1848 // now transform the new nodes, and return the mergemem | |
1849 for (MergeMemStream mms(result); mms.next_non_empty(); ) { | |
1850 Node* phi = mms.memory(); | |
1851 mms.set_memory(phase->transform(phi)); | |
1852 } | |
1853 if (igvn) { // Unhook. | |
1854 igvn->hash_delete(hook); | |
1855 for (uint i = 1; i < hook->req(); i++) { | |
1856 hook->set_req(i, NULL); | |
1857 } | |
1858 } | |
1859 // Replace self with the result. | |
1860 return result; | |
1861 } | |
1862 } | |
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1863 // |
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1864 // Other optimizations on the memory chain |
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1865 // |
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1866 const TypePtr* at = adr_type(); |
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1867 for( uint i=1; i<req(); ++i ) {// For all paths in |
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1868 Node *ii = in(i); |
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1869 Node *new_in = MemNode::optimize_memory_chain(ii, at, phase); |
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1870 if (ii != new_in ) { |
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1871 set_req(i, new_in); |
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|
1872 progress = this; |
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|
1873 } |
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1874 } |
0 | 1875 } |
1876 | |
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1877 #ifdef _LP64 |
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1878 // Push DecodeN/DecodeNKlass down through phi. |
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1879 // The rest of phi graph will transform by split EncodeP node though phis up. |
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1880 if ((UseCompressedOops || UseCompressedKlassPointers) && can_reshape && progress == NULL) { |
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1881 bool may_push = true; |
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1882 bool has_decodeN = false; |
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1883 bool is_decodeN = false; |
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1884 for (uint i=1; i<req(); ++i) {// For all paths in |
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1885 Node *ii = in(i); |
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1886 if (ii->is_DecodeNarrowPtr() && ii->bottom_type() == bottom_type()) { |
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1887 // Do optimization if a non dead path exist. |
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1888 if (ii->in(1)->bottom_type() != Type::TOP) { |
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1889 has_decodeN = true; |
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1890 is_decodeN = ii->is_DecodeN(); |
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1891 } |
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1892 } else if (!ii->is_Phi()) { |
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1893 may_push = false; |
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1894 } |
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1895 } |
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1896 |
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1897 if (has_decodeN && may_push) { |
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1898 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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1899 // Make narrow type for new phi. |
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1900 const Type* narrow_t; |
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1901 if (is_decodeN) { |
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1902 narrow_t = TypeNarrowOop::make(this->bottom_type()->is_ptr()); |
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1903 } else { |
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1904 narrow_t = TypeNarrowKlass::make(this->bottom_type()->is_ptr()); |
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1905 } |
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1906 PhiNode* new_phi = new (phase->C) PhiNode(r, narrow_t); |
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1907 uint orig_cnt = req(); |
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1908 for (uint i=1; i<req(); ++i) {// For all paths in |
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1909 Node *ii = in(i); |
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1910 Node* new_ii = NULL; |
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1911 if (ii->is_DecodeNarrowPtr()) { |
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1912 assert(ii->bottom_type() == bottom_type(), "sanity"); |
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1913 new_ii = ii->in(1); |
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1914 } else { |
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1915 assert(ii->is_Phi(), "sanity"); |
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1916 if (ii->as_Phi() == this) { |
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1917 new_ii = new_phi; |
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1918 } else { |
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1919 if (is_decodeN) { |
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1920 new_ii = new (phase->C) EncodePNode(ii, narrow_t); |
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1921 } else { |
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1922 new_ii = new (phase->C) EncodePKlassNode(ii, narrow_t); |
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1923 } |
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1924 igvn->register_new_node_with_optimizer(new_ii); |
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1925 } |
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1926 } |
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1927 new_phi->set_req(i, new_ii); |
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1928 } |
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1929 igvn->register_new_node_with_optimizer(new_phi, this); |
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1930 if (is_decodeN) { |
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1931 progress = new (phase->C) DecodeNNode(new_phi, bottom_type()); |
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1932 } else { |
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1933 progress = new (phase->C) DecodeNKlassNode(new_phi, bottom_type()); |
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1934 } |
368
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1935 } |
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1936 } |
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1937 #endif |
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1938 |
0 | 1939 return progress; // Return any progress |
1940 } | |
1941 | |
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1942 //------------------------------is_tripcount----------------------------------- |
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1943 bool PhiNode::is_tripcount() const { |
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1944 return (in(0) != NULL && in(0)->is_CountedLoop() && |
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1945 in(0)->as_CountedLoop()->phi() == this); |
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1946 } |
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1947 |
0 | 1948 //------------------------------out_RegMask------------------------------------ |
1949 const RegMask &PhiNode::in_RegMask(uint i) const { | |
1950 return i ? out_RegMask() : RegMask::Empty; | |
1951 } | |
1952 | |
1953 const RegMask &PhiNode::out_RegMask() const { | |
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1954 uint ideal_reg = _type->ideal_reg(); |
0 | 1955 assert( ideal_reg != Node::NotAMachineReg, "invalid type at Phi" ); |
1956 if( ideal_reg == 0 ) return RegMask::Empty; | |
1957 return *(Compile::current()->matcher()->idealreg2spillmask[ideal_reg]); | |
1958 } | |
1959 | |
1960 #ifndef PRODUCT | |
1961 void PhiNode::dump_spec(outputStream *st) const { | |
1962 TypeNode::dump_spec(st); | |
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1963 if (is_tripcount()) { |
0 | 1964 st->print(" #tripcount"); |
1965 } | |
1966 } | |
1967 #endif | |
1968 | |
1969 | |
1970 //============================================================================= | |
1971 const Type *GotoNode::Value( PhaseTransform *phase ) const { | |
1972 // If the input is reachable, then we are executed. | |
1973 // If the input is not reachable, then we are not executed. | |
1974 return phase->type(in(0)); | |
1975 } | |
1976 | |
1977 Node *GotoNode::Identity( PhaseTransform *phase ) { | |
1978 return in(0); // Simple copy of incoming control | |
1979 } | |
1980 | |
1981 const RegMask &GotoNode::out_RegMask() const { | |
1982 return RegMask::Empty; | |
1983 } | |
1984 | |
1985 //============================================================================= | |
1986 const RegMask &JumpNode::out_RegMask() const { | |
1987 return RegMask::Empty; | |
1988 } | |
1989 | |
1990 //============================================================================= | |
1991 const RegMask &JProjNode::out_RegMask() const { | |
1992 return RegMask::Empty; | |
1993 } | |
1994 | |
1995 //============================================================================= | |
1996 const RegMask &CProjNode::out_RegMask() const { | |
1997 return RegMask::Empty; | |
1998 } | |
1999 | |
2000 | |
2001 | |
2002 //============================================================================= | |
2003 | |
2004 uint PCTableNode::hash() const { return Node::hash() + _size; } | |
2005 uint PCTableNode::cmp( const Node &n ) const | |
2006 { return _size == ((PCTableNode&)n)._size; } | |
2007 | |
2008 const Type *PCTableNode::bottom_type() const { | |
2009 const Type** f = TypeTuple::fields(_size); | |
2010 for( uint i = 0; i < _size; i++ ) f[i] = Type::CONTROL; | |
2011 return TypeTuple::make(_size, f); | |
2012 } | |
2013 | |
2014 //------------------------------Value------------------------------------------ | |
2015 // Compute the type of the PCTableNode. If reachable it is a tuple of | |
2016 // Control, otherwise the table targets are not reachable | |
2017 const Type *PCTableNode::Value( PhaseTransform *phase ) const { | |
2018 if( phase->type(in(0)) == Type::CONTROL ) | |
2019 return bottom_type(); | |
2020 return Type::TOP; // All paths dead? Then so are we | |
2021 } | |
2022 | |
2023 //------------------------------Ideal------------------------------------------ | |
2024 // Return a node which is more "ideal" than the current node. Strip out | |
2025 // control copies | |
2026 Node *PCTableNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2027 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
2028 } | |
2029 | |
2030 //============================================================================= | |
2031 uint JumpProjNode::hash() const { | |
2032 return Node::hash() + _dest_bci; | |
2033 } | |
2034 | |
2035 uint JumpProjNode::cmp( const Node &n ) const { | |
2036 return ProjNode::cmp(n) && | |
2037 _dest_bci == ((JumpProjNode&)n)._dest_bci; | |
2038 } | |
2039 | |
2040 #ifndef PRODUCT | |
2041 void JumpProjNode::dump_spec(outputStream *st) const { | |
2042 ProjNode::dump_spec(st); | |
2043 st->print("@bci %d ",_dest_bci); | |
2044 } | |
2045 #endif | |
2046 | |
2047 //============================================================================= | |
2048 //------------------------------Value------------------------------------------ | |
2049 // Check for being unreachable, or for coming from a Rethrow. Rethrow's cannot | |
2050 // have the default "fall_through_index" path. | |
2051 const Type *CatchNode::Value( PhaseTransform *phase ) const { | |
2052 // Unreachable? Then so are all paths from here. | |
2053 if( phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
2054 // First assume all paths are reachable | |
2055 const Type** f = TypeTuple::fields(_size); | |
2056 for( uint i = 0; i < _size; i++ ) f[i] = Type::CONTROL; | |
2057 // Identify cases that will always throw an exception | |
2058 // () rethrow call | |
2059 // () virtual or interface call with NULL receiver | |
2060 // () call is a check cast with incompatible arguments | |
2061 if( in(1)->is_Proj() ) { | |
2062 Node *i10 = in(1)->in(0); | |
2063 if( i10->is_Call() ) { | |
2064 CallNode *call = i10->as_Call(); | |
2065 // Rethrows always throw exceptions, never return | |
2066 if (call->entry_point() == OptoRuntime::rethrow_stub()) { | |
2067 f[CatchProjNode::fall_through_index] = Type::TOP; | |
2068 } else if( call->req() > TypeFunc::Parms ) { | |
2069 const Type *arg0 = phase->type( call->in(TypeFunc::Parms) ); | |
605 | 2070 // Check for null receiver to virtual or interface calls |
0 | 2071 if( call->is_CallDynamicJava() && |
2072 arg0->higher_equal(TypePtr::NULL_PTR) ) { | |
2073 f[CatchProjNode::fall_through_index] = Type::TOP; | |
2074 } | |
2075 } // End of if not a runtime stub | |
2076 } // End of if have call above me | |
2077 } // End of slot 1 is not a projection | |
2078 return TypeTuple::make(_size, f); | |
2079 } | |
2080 | |
2081 //============================================================================= | |
2082 uint CatchProjNode::hash() const { | |
2083 return Node::hash() + _handler_bci; | |
2084 } | |
2085 | |
2086 | |
2087 uint CatchProjNode::cmp( const Node &n ) const { | |
2088 return ProjNode::cmp(n) && | |
2089 _handler_bci == ((CatchProjNode&)n)._handler_bci; | |
2090 } | |
2091 | |
2092 | |
2093 //------------------------------Identity--------------------------------------- | |
2094 // If only 1 target is possible, choose it if it is the main control | |
2095 Node *CatchProjNode::Identity( PhaseTransform *phase ) { | |
2096 // If my value is control and no other value is, then treat as ID | |
2097 const TypeTuple *t = phase->type(in(0))->is_tuple(); | |
2098 if (t->field_at(_con) != Type::CONTROL) return this; | |
2099 // If we remove the last CatchProj and elide the Catch/CatchProj, then we | |
2100 // also remove any exception table entry. Thus we must know the call | |
2101 // feeding the Catch will not really throw an exception. This is ok for | |
2102 // the main fall-thru control (happens when we know a call can never throw | |
605 | 2103 // an exception) or for "rethrow", because a further optimization will |
0 | 2104 // yank the rethrow (happens when we inline a function that can throw an |
2105 // exception and the caller has no handler). Not legal, e.g., for passing | |
2106 // a NULL receiver to a v-call, or passing bad types to a slow-check-cast. | |
2107 // These cases MUST throw an exception via the runtime system, so the VM | |
2108 // will be looking for a table entry. | |
2109 Node *proj = in(0)->in(1); // Expect a proj feeding CatchNode | |
2110 CallNode *call; | |
2111 if (_con != TypeFunc::Control && // Bail out if not the main control. | |
2112 !(proj->is_Proj() && // AND NOT a rethrow | |
2113 proj->in(0)->is_Call() && | |
2114 (call = proj->in(0)->as_Call()) && | |
2115 call->entry_point() == OptoRuntime::rethrow_stub())) | |
2116 return this; | |
2117 | |
2118 // Search for any other path being control | |
2119 for (uint i = 0; i < t->cnt(); i++) { | |
2120 if (i != _con && t->field_at(i) == Type::CONTROL) | |
2121 return this; | |
2122 } | |
2123 // Only my path is possible; I am identity on control to the jump | |
2124 return in(0)->in(0); | |
2125 } | |
2126 | |
2127 | |
2128 #ifndef PRODUCT | |
2129 void CatchProjNode::dump_spec(outputStream *st) const { | |
2130 ProjNode::dump_spec(st); | |
2131 st->print("@bci %d ",_handler_bci); | |
2132 } | |
2133 #endif | |
2134 | |
2135 //============================================================================= | |
2136 //------------------------------Identity--------------------------------------- | |
2137 // Check for CreateEx being Identity. | |
2138 Node *CreateExNode::Identity( PhaseTransform *phase ) { | |
2139 if( phase->type(in(1)) == Type::TOP ) return in(1); | |
2140 if( phase->type(in(0)) == Type::TOP ) return in(0); | |
2141 // We only come from CatchProj, unless the CatchProj goes away. | |
2142 // If the CatchProj is optimized away, then we just carry the | |
2143 // exception oop through. | |
2144 CallNode *call = in(1)->in(0)->as_Call(); | |
2145 | |
2146 return ( in(0)->is_CatchProj() && in(0)->in(0)->in(1) == in(1) ) | |
2147 ? this | |
2148 : call->in(TypeFunc::Parms); | |
2149 } | |
2150 | |
2151 //============================================================================= | |
127 | 2152 //------------------------------Value------------------------------------------ |
2153 // Check for being unreachable. | |
2154 const Type *NeverBranchNode::Value( PhaseTransform *phase ) const { | |
2155 if (!in(0) || in(0)->is_top()) return Type::TOP; | |
2156 return bottom_type(); | |
2157 } | |
2158 | |
2159 //------------------------------Ideal------------------------------------------ | |
2160 // Check for no longer being part of a loop | |
2161 Node *NeverBranchNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
2162 if (can_reshape && !in(0)->is_Loop()) { | |
2163 // Dead code elimination can sometimes delete this projection so | |
2164 // if it's not there, there's nothing to do. | |
2165 Node* fallthru = proj_out(0); | |
2166 if (fallthru != NULL) { | |
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2167 phase->is_IterGVN()->replace_node(fallthru, in(0)); |
127 | 2168 } |
2169 return phase->C->top(); | |
2170 } | |
2171 return NULL; | |
2172 } | |
2173 | |
0 | 2174 #ifndef PRODUCT |
2175 void NeverBranchNode::format( PhaseRegAlloc *ra_, outputStream *st) const { | |
2176 st->print("%s", Name()); | |
2177 } | |
2178 #endif |