1 /*
2 * Copyright (c) 2015, Red Hat, Inc. and/or its affiliates.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #include "precompiled.hpp"
25 #include "gc/shenandoah/brooksPointer.hpp"
26 #include "gc/shenandoah/shenandoahHeap.hpp"
27 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
28 #include "opto/arraycopynode.hpp"
29 #include "opto/block.hpp"
30 #include "opto/callnode.hpp"
31 #include "opto/castnode.hpp"
32 #include "opto/movenode.hpp"
33 #include "opto/phaseX.hpp"
34 #include "opto/rootnode.hpp"
35 #include "opto/runtime.hpp"
36 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
37 #include "gc/shenandoah/c2/shenandoahSupport.hpp"
38 #include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp"
39 #include "opto/subnode.hpp"
40
41 Node* ShenandoahBarrierNode::skip_through_barrier(Node* n) {
42 if (n == NULL) {
43 return NULL;
44 } else if (n->is_ShenandoahBarrier()) {
45 return n->in(ValueIn);
46 } else if (n->is_Phi() &&
47 n->req() == 3 &&
48 n->in(1) != NULL &&
49 n->in(1)->is_ShenandoahBarrier() &&
50 n->in(2) != NULL &&
51 n->in(2)->bottom_type() == TypePtr::NULL_PTR &&
52 n->in(0) != NULL &&
53 n->in(0)->in(1) != NULL &&
54 n->in(0)->in(1)->is_IfProj() &&
55 n->in(0)->in(2) != NULL &&
56 n->in(0)->in(2)->is_IfProj() &&
57 n->in(0)->in(1)->in(0) != NULL &&
58 n->in(0)->in(1)->in(0) == n->in(0)->in(2)->in(0) &&
59 n->in(1)->in(ValueIn)->Opcode() == Op_CastPP) {
60 Node* iff = n->in(0)->in(1)->in(0);
61 Node* res = n->in(1)->in(ValueIn)->in(1);
62 if (iff->is_If() &&
63 iff->in(1) != NULL &&
64 iff->in(1)->is_Bool() &&
65 iff->in(1)->as_Bool()->_test._test == BoolTest::ne &&
66 iff->in(1)->in(1) != NULL &&
67 iff->in(1)->in(1)->Opcode() == Op_CmpP &&
68 iff->in(1)->in(1)->in(1) != NULL &&
69 iff->in(1)->in(1)->in(1) == res &&
70 iff->in(1)->in(1)->in(2) != NULL &&
71 iff->in(1)->in(1)->in(2)->bottom_type() == TypePtr::NULL_PTR) {
72 return res;
73 }
74 }
75 return n;
76 }
77
78 bool ShenandoahBarrierNode::needs_barrier(PhaseGVN* phase, ShenandoahBarrierNode* orig, Node* n, Node* rb_mem, bool allow_fromspace) {
79 Unique_Node_List visited;
80 return needs_barrier_impl(phase, orig, n, rb_mem, allow_fromspace, visited);
81 }
82
83 bool ShenandoahBarrierNode::needs_barrier_impl(PhaseGVN* phase, ShenandoahBarrierNode* orig, Node* n, Node* rb_mem, bool allow_fromspace, Unique_Node_List &visited) {
84
85 if (visited.member(n)) {
86 return false; // Been there.
87 }
88 visited.push(n);
89
90 if (n->is_Allocate()) {
91 // tty->print_cr("killed barrier for newly allocated object");
92 return false;
93 }
94
95 if (n->is_CallJava() || n->Opcode() == Op_CallLeafNoFP) {
96 return true;
97 }
98
99 const Type* type = phase->type(n);
100 if (type == Type::TOP) {
101 return false;
102 }
103 if (type->make_ptr()->higher_equal(TypePtr::NULL_PTR)) {
104 // tty->print_cr("killed barrier for NULL object");
105 return false;
106 }
107 if (type->make_oopptr() && type->make_oopptr()->const_oop() != NULL) {
108 // tty->print_cr("killed barrier for constant object");
109 return ShenandoahBarriersForConst;
110 }
111
112 if (ShenandoahOptimizeStableFinals) {
113 const TypeAryPtr* ary = type->isa_aryptr();
114 if (ary && ary->is_stable() && allow_fromspace) {
115 return false;
116 }
117 }
118
119 if (n->is_CheckCastPP() || n->is_ConstraintCast()) {
120 return needs_barrier_impl(phase, orig, n->in(1), rb_mem, allow_fromspace, visited);
121 }
122 if (n->is_Parm()) {
123 return true;
124 }
125 if (n->is_Proj()) {
126 return needs_barrier_impl(phase, orig, n->in(0), rb_mem, allow_fromspace, visited);
127 }
128 if (n->is_Phi()) {
129 bool need_barrier = false;
130 for (uint i = 1; i < n->req() && ! need_barrier; i++) {
131 Node* input = n->in(i);
132 if (input == NULL) {
133 need_barrier = true; // Phi not complete yet?
134 } else if (needs_barrier_impl(phase, orig, input, rb_mem, allow_fromspace, visited)) {
135 need_barrier = true;
136 }
137 }
138 return need_barrier;
139 }
140 if (n->is_CMove()) {
141 return needs_barrier_impl(phase, orig, n->in(CMoveNode::IfFalse), rb_mem, allow_fromspace, visited) ||
142 needs_barrier_impl(phase, orig, n->in(CMoveNode::IfTrue ), rb_mem, allow_fromspace, visited);
143 }
144 if (n->Opcode() == Op_CreateEx) {
145 return true;
146 }
147 if (n->Opcode() == Op_ShenandoahWriteBarrier) {
148 // tty->print_cr("skipped barrier for chained write barrier object");
149 return false;
150 }
151 if (n->Opcode() == Op_ShenandoahReadBarrier) {
152 if (rb_mem == n->in(Memory)) {
153 // tty->print_cr("Eliminated chained read barrier");
154 return false;
155 } else {
156 return true;
157 }
158 }
159
160 if (n->Opcode() == Op_LoadP ||
161 n->Opcode() == Op_LoadN ||
162 n->Opcode() == Op_GetAndSetP ||
163 n->Opcode() == Op_CompareAndExchangeP ||
164 n->Opcode() == Op_GetAndSetN ||
165 n->Opcode() == Op_CompareAndExchangeN) {
166 return true;
167 }
168 if (n->Opcode() == Op_DecodeN ||
169 n->Opcode() == Op_EncodeP) {
170 return needs_barrier_impl(phase, orig, n->in(1), rb_mem, allow_fromspace, visited);
171 }
172
173 #ifdef ASSERT
174 tty->print("need barrier on?: "); n->dump();
175 ShouldNotReachHere();
176 #endif
177 return true;
178 }
179
180 /**
181 * In Shenandoah, we need barriers on acmp (and similar instructions that compare two
182 * oops) to avoid false negatives. If it compares a from-space and a to-space
183 * copy of an object, a regular acmp would return false, even though both are
184 * the same. The acmp barrier compares the two objects, and when they are
185 * *not equal* it does a read-barrier on both, and compares them again. When it
186 * failed because of different copies of the object, we know that the object
187 * must already have been evacuated (and therefore doesn't require a write-barrier).
188 */
189 void ShenandoahBarrierNode::do_cmpp_if(GraphKit& kit, Node*& taken_branch, Node*& untaken_branch, Node*& taken_memory, Node*& untaken_memory) {
190 assert(taken_memory == NULL && untaken_memory == NULL, "unexpected memory inputs");
191 if (!UseShenandoahGC || !ShenandoahAcmpBarrier || ShenandoahVerifyOptoBarriers) {
192 return;
193 }
194 if (taken_branch->is_top() || untaken_branch->is_top()) {
195 // one of the branches is known to be untaken
196 return;
197 }
198 assert(taken_branch->is_IfProj() && untaken_branch->is_IfProj(), "if projections only");
199 assert(taken_branch->in(0) == untaken_branch->in(0), "should come from same if");
200 IfNode* iff = taken_branch->in(0)->as_If();
201 BoolNode* bol = iff->in(1)->as_Bool();
202 Node* cmp = bol->in(1);
203 if (cmp->Opcode() != Op_CmpP) {
204 return;
205 }
206 Node* a = cmp->in(1);
207 Node* b = cmp->in(2);
208 const Type* a_type = kit.gvn().type(a);
209 const Type* b_type = kit.gvn().type(b);
210 if (a_type->higher_equal(TypePtr::NULL_PTR) || b_type->higher_equal(TypePtr::NULL_PTR)) {
211 // We know one arg is gonna be null. No need for barriers.
212 return;
213 }
214
215 const TypePtr* a_adr_type = ShenandoahBarrierNode::brooks_pointer_type(a_type);
216 const TypePtr* b_adr_type = ShenandoahBarrierNode::brooks_pointer_type(b_type);
217 if ((! ShenandoahBarrierNode::needs_barrier(&kit.gvn(), NULL, a, kit.memory(a_adr_type), false)) &&
218 (! ShenandoahBarrierNode::needs_barrier(&kit.gvn(), NULL, b, kit.memory(b_adr_type), false))) {
219 // We know both args are in to-space already. No acmp barrier needed.
220 return;
221 }
222
223 Node* equal_path = iff->proj_out(true);
224 Node* not_equal_path = iff->proj_out(false);
225
226 if (bol->_test._test == BoolTest::ne) {
227 swap(equal_path, not_equal_path);
228 }
229
230 Node* init_equal_path = equal_path;
231 Node* init_not_equal_path = not_equal_path;
232
233 uint alias_a = kit.C->get_alias_index(a_adr_type);
234 uint alias_b = kit.C->get_alias_index(b_adr_type);
235
236 Node* equal_memory = NULL;
237 Node* not_equal_memory = NULL;
238
239 RegionNode* region = new RegionNode(3);
240 region->init_req(1, equal_path);
241 PhiNode* mem_phi = NULL;
242 if (alias_a == alias_b) {
243 mem_phi = PhiNode::make(region, kit.memory(alias_a), Type::MEMORY, kit.C->get_adr_type(alias_a));
244 } else {
245 Node* mem = kit.reset_memory();
246 mem_phi = PhiNode::make(region, mem, Type::MEMORY, TypePtr::BOTTOM);
247 kit.set_all_memory(mem);
248 }
249
250 kit.set_control(not_equal_path);
251
252 Node* mb = NULL;
253 if (alias_a == alias_b) {
254 Node* mem = kit.reset_memory();
255 mb = MemBarNode::make(kit.C, Op_MemBarAcquire, alias_a);
256 mb->init_req(TypeFunc::Control, kit.control());
257 mb->init_req(TypeFunc::Memory, mem);
258 Node* membar = kit.gvn().transform(mb);
259 kit.set_control(kit.gvn().transform(new ProjNode(membar, TypeFunc::Control)));
260 Node* newmem = kit.gvn().transform(new ProjNode(membar, TypeFunc::Memory));
261 kit.set_all_memory(mem);
262 kit.set_memory(newmem, alias_a);
263 } else {
264 mb = kit.insert_mem_bar(Op_MemBarAcquire);
265 }
266
267 ShenandoahBarrierSetC2* bs = (ShenandoahBarrierSetC2*) BarrierSet::barrier_set()->barrier_set_c2();
268 a = bs->shenandoah_read_barrier_acmp(&kit, a);
269 b = bs->shenandoah_read_barrier_acmp(&kit, b);
270
271 Node* cmp2 = kit.gvn().transform(new CmpPNode(a, b));
272 Node* bol2 = bol->clone();
273 bol2->set_req(1, cmp2);
274 bol2 = kit.gvn().transform(bol2);
275 Node* iff2 = iff->clone();
276 iff2->set_req(0, kit.control());
277 iff2->set_req(1, bol2);
278 kit.gvn().set_type(iff2, kit.gvn().type(iff));
279 Node* equal_path2 = equal_path->clone();
280 equal_path2->set_req(0, iff2);
281 equal_path2 = kit.gvn().transform(equal_path2);
282 Node* not_equal_path2 = not_equal_path->clone();
283 not_equal_path2->set_req(0, iff2);
284 not_equal_path2 = kit.gvn().transform(not_equal_path2);
285
286 region->init_req(2, equal_path2);
287 not_equal_memory = kit.reset_memory();
288 not_equal_path = not_equal_path2;
289
290 kit.set_all_memory(not_equal_memory);
291
292 if (alias_a == alias_b) {
293 mem_phi->init_req(2, kit.memory(alias_a));
294 kit.set_memory(mem_phi, alias_a);
295 } else {
296 mem_phi->init_req(2, kit.reset_memory());
297 }
298
299 kit.record_for_igvn(mem_phi);
300 kit.gvn().set_type(mem_phi, Type::MEMORY);
301
302 if (alias_a == alias_b) {
303 equal_memory = kit.reset_memory();
304 } else {
305 equal_memory = mem_phi;
306 }
307
308 assert(kit.map()->memory() == NULL, "no live memory state");
309 equal_path = kit.gvn().transform(region);
310
311 if (taken_branch == init_equal_path) {
312 assert(untaken_branch == init_not_equal_path, "inconsistent");
313 taken_branch = equal_path;
314 untaken_branch = not_equal_path;
315 taken_memory = equal_memory;
316 untaken_memory = not_equal_memory;
317 } else {
318 assert(taken_branch == init_not_equal_path, "inconsistent");
319 assert(untaken_branch == init_equal_path, "inconsistent");
320 taken_branch = not_equal_path;
321 untaken_branch = equal_path;
322 taken_memory = not_equal_memory;
323 untaken_memory = equal_memory;
324 }
325 }
326
327 bool ShenandoahReadBarrierNode::dominates_memory_rb_impl(PhaseGVN* phase,
328 Node* b1,
329 Node* b2,
330 Node* current,
331 bool linear) {
332 ResourceMark rm;
333 VectorSet visited(Thread::current()->resource_area());
334 Node_Stack phis(0);
335
336 for(int i = 0; i < 10; i++) {
337 if (current == NULL) {
338 return false;
339 } else if (visited.test_set(current->_idx) || current->is_top() || current == b1) {
340 current = NULL;
341 while (phis.is_nonempty() && current == NULL) {
342 uint idx = phis.index();
343 Node* phi = phis.node();
344 if (idx >= phi->req()) {
345 phis.pop();
346 } else {
347 current = phi->in(idx);
348 phis.set_index(idx+1);
349 }
350 }
351 if (current == NULL) {
352 return true;
353 }
354 } else if (current == phase->C->immutable_memory()) {
355 return false;
356 } else if (current->isa_Phi()) {
357 if (!linear) {
358 return false;
359 }
360 phis.push(current, 2);
361 current = current->in(1);
362 } else if (current->Opcode() == Op_ShenandoahWriteBarrier) {
363 const Type* in_type = current->bottom_type();
364 const Type* this_type = b2->bottom_type();
365 if (is_independent(in_type, this_type)) {
366 current = current->in(Memory);
367 } else {
368 return false;
369 }
370 } else if (current->Opcode() == Op_ShenandoahWBMemProj) {
371 current = current->in(0);
372 } else if (current->is_Proj()) {
373 current = current->in(0);
374 } else if (current->is_Call()) {
375 return false; // TODO: Maybe improve by looking at the call's memory effects?
376 } else if (current->is_MemBar()) {
377 return false; // TODO: Do we need to stop at *any* membar?
378 } else if (current->is_MergeMem()) {
379 // if (true) return false;
380 // tty->print_cr("current == mergemem: "); current->dump();
381 const TypePtr* adr_type = brooks_pointer_type(phase->type(b2));
382 uint alias_idx = phase->C->get_alias_index(adr_type);
383 current = current->as_MergeMem()->memory_at(alias_idx);
384 } else {
385 // tty->print_cr("what else can we see here:");
386 #ifdef ASSERT
387 current->dump();
388 #endif
389 ShouldNotReachHere();
390 return false;
391 }
392 }
393 return false;
394 }
395
396 bool ShenandoahReadBarrierNode::is_independent(Node* mem) {
397 if (mem->is_Phi() || mem->is_Proj() || mem->is_MergeMem()) {
398 return true;
399 } else if (mem->Opcode() == Op_ShenandoahWriteBarrier) {
400 const Type* mem_type = mem->bottom_type();
401 const Type* this_type = bottom_type();
402 if (is_independent(mem_type, this_type)) {
403 return true;
404 } else {
405 return false;
406 }
407 } else if (mem->is_Call() || mem->is_MemBar()) {
408 return false;
409 }
410 #ifdef ASSERT
411 mem->dump();
412 #endif
413 ShouldNotReachHere();
414 return true;
415 }
416
417
418 bool ShenandoahReadBarrierNode::dominates_memory_rb(PhaseGVN* phase, Node* b1, Node* b2, bool linear) {
419 return dominates_memory_rb_impl(phase, b1->in(Memory), b2, b2->in(Memory), linear);
420 }
421
422 bool ShenandoahReadBarrierNode::is_independent(const Type* in_type, const Type* this_type) {
423 assert(in_type->isa_oopptr(), "expect oop ptr");
424 assert(this_type->isa_oopptr(), "expect oop ptr");
425 /*
426 if ((! in_type->isa_oopptr()) || (! this_type->isa_oopptr())) {
427 #ifdef ASSERT
428 tty->print_cr("not oopptr");
429 tty->print("in: "); in_type->dump(); tty->print_cr(" ");
430 tty->print("this: "); this_type->dump(); tty->print_cr(" ");
431 #endif
432 return false;
433 }
434 */
435
436 ciKlass* in_kls = in_type->is_oopptr()->klass();
437 ciKlass* this_kls = this_type->is_oopptr()->klass();
438 if (in_kls != NULL && this_kls != NULL &&
439 in_kls->is_loaded() && this_kls->is_loaded() &&
440 (!in_kls->is_subclass_of(this_kls)) &&
441 (!this_kls->is_subclass_of(in_kls))) {
442 #ifdef ASSERT
443 // tty->print_cr("independent: ");
444 // tty->print("in: "); in_kls->print(); tty->print_cr(" ");
445 // tty->print("this: "); this_kls->print(); tty->print_cr(" ");
446 #endif
447 return true;
448 }
449 #ifdef ASSERT
450 // tty->print_cr("possibly dependend?");
451 // tty->print("in: "); in_type->dump(); tty->print_cr(" ");
452 // tty->print("this: "); this_type->dump(); tty->print_cr(" ");
453 #endif
454 return false;
455 }
456
457 Node* ShenandoahReadBarrierNode::Ideal(PhaseGVN *phase, bool can_reshape) {
458
459 if (! can_reshape) {
460 return NULL;
461 }
462
463 if (in(Memory) == phase->C->immutable_memory()) return NULL;
464
465 // If memory input is a MergeMem, take the appropriate slice out of it.
466 Node* mem_in = in(Memory);
467 if (mem_in->isa_MergeMem()) {
468 const TypePtr* adr_type = brooks_pointer_type(bottom_type());
469 uint alias_idx = phase->C->get_alias_index(adr_type);
470 mem_in = mem_in->as_MergeMem()->memory_at(alias_idx);
471 set_req(Memory, mem_in);
472 return this;
473 }
474
475 Node* input = in(Memory);
476 if (input->Opcode() == Op_ShenandoahWBMemProj) {
477 Node* wb = input->in(0);
478 const Type* in_type = phase->type(wb);
479 // is_top() test not sufficient here: we can come here after CCP
480 // in a dead branch of the graph that has not yet been removed.
481 if (in_type == Type::TOP) return NULL; // Dead path.
482 assert(wb->Opcode() == Op_ShenandoahWriteBarrier, "expect write barrier");
483 if (is_independent(in_type, _type)) {
484 phase->igvn_rehash_node_delayed(wb);
485 set_req(Memory, wb->in(Memory));
486 if (can_reshape && input->outcnt() == 0) {
487 phase->is_IterGVN()->_worklist.push(input);
488 }
489 return this;
490 }
491 }
492 return NULL;
493 }
494
495 ShenandoahWriteBarrierNode::ShenandoahWriteBarrierNode(Compile* C, Node* ctrl, Node* mem, Node* obj)
496 : ShenandoahBarrierNode(ctrl, mem, obj, false) {
497 assert(UseShenandoahGC && ShenandoahWriteBarrier, "should be enabled");
498 ShenandoahBarrierSetC2::bsc2()->state()->add_shenandoah_barrier(this);
499 }
500
501 Node* ShenandoahWriteBarrierNode::Identity(PhaseGVN* phase) {
502 assert(in(0) != NULL, "should have control");
503 PhaseIterGVN* igvn = phase->is_IterGVN();
504 Node* mem_in = in(Memory);
505 Node* mem_proj = NULL;
506
507 if (igvn != NULL) {
508 mem_proj = find_out_with(Op_ShenandoahWBMemProj);
509 if (mem_proj == NULL || mem_in == mem_proj) {
510 return this;
511 }
512 }
513
514 Node* replacement = Identity_impl(phase);
515 if (igvn != NULL) {
516 if (replacement != NULL && replacement != this) {
517 igvn->replace_node(mem_proj, mem_in);
518 }
519 }
520 return replacement;
521 }
522
523
524 Node* ShenandoahWriteBarrierNode::Ideal(PhaseGVN *phase, bool can_reshape) {
525 assert(in(0) != NULL, "should have control");
526 if (!can_reshape) {
527 return NULL;
528 }
529
530 PhaseIterGVN* igvn = phase->is_IterGVN();
531 Node* mem_proj = find_out_with(Op_ShenandoahWBMemProj);
532 Node* mem_in = in(Memory);
533
534 if (mem_in == phase->C->immutable_memory()) return NULL;
535
536 if (mem_in->isa_MergeMem()) {
537 const TypePtr* adr_type = brooks_pointer_type(bottom_type());
538 uint alias_idx = phase->C->get_alias_index(adr_type);
539 mem_in = mem_in->as_MergeMem()->memory_at(alias_idx);
540 set_req(Memory, mem_in);
541 return this;
542 }
543
544 return NULL;
545 }
546
547 bool ShenandoahWriteBarrierNode::expand(Compile* C, PhaseIterGVN& igvn, int& loop_opts_cnt) {
548 if (UseShenandoahGC && ShenandoahWriteBarrierToIR) {
549 if (ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count() > 0) {
550 bool attempt_more_loopopts = ShenandoahLoopOptsAfterExpansion;
551 C->clear_major_progress();
552 PhaseIdealLoop ideal_loop(igvn, LoopOptsShenandoahExpand);
553 if (C->failing()) return false;
554 PhaseIdealLoop::verify(igvn);
555 DEBUG_ONLY(ShenandoahBarrierNode::verify_raw_mem(C->root());)
556 if (attempt_more_loopopts) {
557 C->set_major_progress();
558 if (!C->optimize_loops(loop_opts_cnt, igvn, LoopOptsShenandoahPostExpand)) {
559 return false;
560 }
561 C->clear_major_progress();
562 }
563 }
564 }
565 return true;
566 }
567
568 bool ShenandoahWriteBarrierNode::is_heap_state_test(Node* iff, int mask) {
569 if (!UseShenandoahGC) {
570 return false;
571 }
572 assert(iff->is_If(), "bad input");
573 if (iff->Opcode() != Op_If) {
574 return false;
575 }
576 Node* bol = iff->in(1);
577 if (!bol->is_Bool() || bol->as_Bool()->_test._test != BoolTest::ne) {
578 return false;
579 }
580 Node* cmp = bol->in(1);
581 if (cmp->Opcode() != Op_CmpI) {
582 return false;
583 }
584 Node* in1 = cmp->in(1);
585 Node* in2 = cmp->in(2);
586 if (in2->find_int_con(-1) != 0) {
587 return false;
588 }
589 if (in1->Opcode() != Op_AndI) {
590 return false;
591 }
592 in2 = in1->in(2);
593 if (in2->find_int_con(-1) != mask) {
594 return false;
595 }
596 in1 = in1->in(1);
597
598 return is_gc_state_load(in1);
599 }
600
601
602 bool ShenandoahWriteBarrierNode::is_evacuation_in_progress_test(Node* iff) {
603 return is_heap_state_test(iff, ShenandoahHeap::EVACUATION | ShenandoahHeap::TRAVERSAL);
604 }
605
606 bool ShenandoahWriteBarrierNode::is_heap_stable_test(Node* iff) {
607 if (!UseShenandoahGC) {
608 return false;
609 }
610 assert(iff->is_If(), "bad input");
611 if (iff->Opcode() != Op_If) {
612 return false;
613 }
614 Node* bol = iff->in(1);
615 if (bol == NULL || !bol->is_Bool() || bol->as_Bool()->_test._test != BoolTest::ne) {
616 return false;
617 }
618 Node* cmp = bol->in(1);
619 if (cmp->Opcode() != Op_CmpI) {
620 return false;
621 }
622 Node* in1 = cmp->in(1);
623 Node* in2 = cmp->in(2);
624 if (in2->find_int_con(-1) != 0) {
625 return false;
626 }
627 return is_gc_state_load(in1);
628 }
629
630 bool ShenandoahWriteBarrierNode::is_gc_state_load(Node *n) {
631 if (!UseShenandoahGC) {
632 return false;
633 }
634 if (n->Opcode() != Op_LoadB) {
635 return false;
636 }
637 Node* addp = n->in(MemNode::Address);
638 if (!addp->is_AddP()) {
639 return false;
640 }
641 Node* base = addp->in(AddPNode::Address);
642 Node* off = addp->in(AddPNode::Offset);
643 if (base->Opcode() != Op_ThreadLocal) {
644 return false;
645 }
646 if (off->find_intptr_t_con(-1) != in_bytes(ShenandoahThreadLocalData::gc_state_offset())) {
647 return false;
648 }
649 return true;
650 }
651
652 bool ShenandoahWriteBarrierNode::has_safepoint_between(Node* start, Node* stop, PhaseIdealLoop *phase) {
653 assert(phase->is_dominator(stop, start), "bad inputs");
654 ResourceMark rm;
655 Unique_Node_List wq;
656 wq.push(start);
657 for (uint next = 0; next < wq.size(); next++) {
658 Node *m = wq.at(next);
659 if (m == stop) {
660 continue;
661 }
662 if (m->is_SafePoint() && !m->is_CallLeaf()) {
663 return true;
664 }
665 if (m->is_Region()) {
666 for (uint i = 1; i < m->req(); i++) {
667 wq.push(m->in(i));
668 }
669 } else {
670 wq.push(m->in(0));
671 }
672 }
673 return false;
674 }
675
676 bool ShenandoahWriteBarrierNode::try_common_gc_state_load(Node *n, PhaseIdealLoop *phase) {
677 assert(is_gc_state_load(n), "inconsistent");
678 Node* addp = n->in(MemNode::Address);
679 Node* dominator = NULL;
680 for (DUIterator_Fast imax, i = addp->fast_outs(imax); i < imax; i++) {
681 Node* u = addp->fast_out(i);
682 assert(is_gc_state_load(u), "inconsistent");
683 if (u != n && phase->is_dominator(u->in(0), n->in(0))) {
684 if (dominator == NULL) {
685 dominator = u;
686 } else {
687 if (phase->dom_depth(u->in(0)) < phase->dom_depth(dominator->in(0))) {
688 dominator = u;
689 }
690 }
691 }
692 }
693 if (dominator == NULL || has_safepoint_between(n->in(0), dominator->in(0), phase)) {
694 return false;
695 }
696 phase->igvn().replace_node(n, dominator);
697
698 return true;
699 }
700
701 Node* ShenandoahWriteBarrierNode::evacuation_in_progress_test_ctrl(Node* iff) {
702 assert(is_evacuation_in_progress_test(iff), "bad input");
703 return iff->in(0);
704 }
705
706 bool ShenandoahBarrierNode::dominates_memory_impl(PhaseGVN* phase,
707 Node* b1,
708 Node* b2,
709 Node* current,
710 bool linear) {
711 ResourceMark rm;
712 VectorSet visited(Thread::current()->resource_area());
713 Node_Stack phis(0);
714
715
716 for(int i = 0; i < 10; i++) {
717 if (current == NULL) {
718 return false;
719 } else if (visited.test_set(current->_idx) || current->is_top() || current == b1) {
720 current = NULL;
721 while (phis.is_nonempty() && current == NULL) {
722 uint idx = phis.index();
723 Node* phi = phis.node();
724 if (idx >= phi->req()) {
725 phis.pop();
726 } else {
727 current = phi->in(idx);
728 phis.set_index(idx+1);
729 }
730 }
731 if (current == NULL) {
732 return true;
733 }
734 } else if (current == b2) {
735 return false;
736 } else if (current == phase->C->immutable_memory()) {
737 return false;
738 } else if (current->isa_Phi()) {
739 if (!linear) {
740 return false;
741 }
742 phis.push(current, 2);
743 current = current->in(1);
744 } else if (current->Opcode() == Op_ShenandoahWriteBarrier) {
745 current = current->in(Memory);
746 } else if (current->Opcode() == Op_ShenandoahWBMemProj) {
747 current = current->in(0);
748 } else if (current->is_Proj()) {
749 current = current->in(0);
750 } else if (current->is_Call()) {
751 current = current->in(TypeFunc::Memory);
752 } else if (current->is_MemBar()) {
753 current = current->in(TypeFunc::Memory);
754 } else if (current->is_MergeMem()) {
755 const TypePtr* adr_type = brooks_pointer_type(phase->type(b2));
756 uint alias_idx = phase->C->get_alias_index(adr_type);
757 current = current->as_MergeMem()->memory_at(alias_idx);
758 } else {
759 #ifdef ASSERT
760 current->dump();
761 #endif
762 ShouldNotReachHere();
763 return false;
764 }
765 }
766 return false;
767 }
768
769 /**
770 * Determines if b1 dominates b2 through memory inputs. It returns true if:
771 * - b1 can be reached by following each branch in b2's memory input (through phis, etc)
772 * - or we get back to b2 (i.e. through a loop) without seeing b1
773 * In all other cases, (in particular, if we reach immutable_memory without having seen b1)
774 * we return false.
775 */
776 bool ShenandoahBarrierNode::dominates_memory(PhaseGVN* phase, Node* b1, Node* b2, bool linear) {
777 return dominates_memory_impl(phase, b1, b2, b2->in(Memory), linear);
778 }
779
780 Node* ShenandoahBarrierNode::Identity_impl(PhaseGVN* phase) {
781 Node* n = in(ValueIn);
782
783 Node* rb_mem = Opcode() == Op_ShenandoahReadBarrier ? in(Memory) : NULL;
784 if (! needs_barrier(phase, this, n, rb_mem, _allow_fromspace)) {
785 return n;
786 }
787
788 // tty->print_cr("find sibling for: "); dump(2);
789 // Try to find a write barrier sibling with identical inputs that we can fold into.
790 for (DUIterator i = n->outs(); n->has_out(i); i++) {
791 Node* sibling = n->out(i);
792 if (sibling == this) {
793 continue;
794 }
795 /*
796 assert(sibling->Opcode() != Op_ShenandoahWriteBarrier ||
797 Opcode() != Op_ShenandoahWriteBarrier || hash() == sibling->hash(),
798 "if this is a write barrier, then sibling can't be write barrier too");
799 */
800 if (sibling->Opcode() != Op_ShenandoahWriteBarrier) {
801 continue;
802 }
803 /*
804 if (sibling->outcnt() == 0) {
805 // Some dead node.
806 continue;
807 }
808 */
809 assert(sibling->in(ValueIn) == in(ValueIn), "sanity");
810 assert(sibling->Opcode() == Op_ShenandoahWriteBarrier, "sanity");
811 // tty->print_cr("candidate: "); sibling->dump();
812
813 if (dominates_memory(phase, sibling, this, phase->is_IterGVN() == NULL)) {
814
815 /*
816 tty->print_cr("matched barrier:");
817 sibling->dump();
818 tty->print_cr("for: ");
819 dump();
820 */
821 return sibling;
822 }
823
824 /*
825 tty->print_cr("couldn't match candidate:");
826 sibling->dump(2);
827 */
828 }
829 /*
830 tty->print_cr("couldn't match barrier to any:");
831 dump();
832 */
833 return this;
834 }
835
836 #ifndef PRODUCT
837 void ShenandoahBarrierNode::dump_spec(outputStream *st) const {
838 const TypePtr* adr = adr_type();
839 if (adr == NULL) {
840 return;
841 }
842 st->print(" @");
843 adr->dump_on(st);
844 st->print(" (");
845 Compile::current()->alias_type(adr)->adr_type()->dump_on(st);
846 st->print(") ");
847 }
848 #endif
849
850 Node* ShenandoahReadBarrierNode::Identity(PhaseGVN* phase) {
851
852 // if (true) return this;
853
854 // tty->print("optimizing rb: "); dump();
855 Node* id = Identity_impl(phase);
856
857 if (id == this && phase->is_IterGVN()) {
858 Node* n = in(ValueIn);
859 // No success in super call. Try to combine identical read barriers.
860 for (DUIterator i = n->outs(); n->has_out(i); i++) {
861 Node* sibling = n->out(i);
862 if (sibling == this || sibling->Opcode() != Op_ShenandoahReadBarrier) {
863 continue;
864 }
865 assert(sibling->in(ValueIn) == in(ValueIn), "sanity");
866 if (phase->is_IterGVN()->hash_find(sibling) &&
867 sibling->bottom_type() == bottom_type() &&
868 sibling->in(Control) == in(Control) &&
869 dominates_memory_rb(phase, sibling, this, phase->is_IterGVN() == NULL)) {
870 /*
871 if (in(Memory) != sibling->in(Memory)) {
872 tty->print_cr("interesting rb-fold");
873 dump();
874 sibling->dump();
875 }
876 */
877 return sibling;
878 }
879 }
880 }
881 return id;
882 }
883
884 const Type* ShenandoahBarrierNode::Value(PhaseGVN* phase) const {
885 // Either input is TOP ==> the result is TOP
886 const Type *t1 = phase->type(in(Memory));
887 if (t1 == Type::TOP) return Type::TOP;
888 const Type *t2 = phase->type(in(ValueIn));
889 if( t2 == Type::TOP ) return Type::TOP;
890
891 Node* input = in(ValueIn);
892 const Type* type = phase->type(input)->is_oopptr()->cast_to_nonconst();
893 return type;
894 }
895
896 uint ShenandoahBarrierNode::hash() const {
897 return TypeNode::hash() + _allow_fromspace;
898 }
899
900 uint ShenandoahBarrierNode::cmp(const Node& n) const {
901 return _allow_fromspace == ((ShenandoahBarrierNode&) n)._allow_fromspace
902 && TypeNode::cmp(n);
903 }
904
905 uint ShenandoahBarrierNode::size_of() const {
906 return sizeof(*this);
907 }
908
909 Node* ShenandoahWBMemProjNode::Identity(PhaseGVN* phase) {
910
911 Node* wb = in(0);
912 if (wb->is_top()) return phase->C->top(); // Dead path.
913
914 assert(wb->Opcode() == Op_ShenandoahWriteBarrier, "expect write barrier");
915 PhaseIterGVN* igvn = phase->is_IterGVN();
916 // We can't do the below unless the graph is fully constructed.
917 if (igvn == NULL) {
918 return this;
919 }
920
921 // If the mem projection has no barrier users, it's not needed anymore.
922 Unique_Node_List visited;
923 if (wb->outcnt() == 1) {
924 return wb->in(ShenandoahBarrierNode::Memory);
925 }
926
927 return this;
928 }
929
930 #ifdef ASSERT
931 bool ShenandoahBarrierNode::verify_helper(Node* in, Node_Stack& phis, VectorSet& visited, verify_type t, bool trace, Unique_Node_List& barriers_used) {
932 assert(phis.size() == 0, "");
933
934 while (true) {
935 if (!in->bottom_type()->make_ptr()->make_oopptr()) {
936 if (trace) {tty->print_cr("Non oop");}
937 } else if (t == ShenandoahLoad && ShenandoahOptimizeStableFinals &&
938 in->bottom_type()->make_ptr()->isa_aryptr() &&
939 in->bottom_type()->make_ptr()->is_aryptr()->is_stable()) {
940 if (trace) {tty->print_cr("Stable array load");}
941 } else {
942 if (in->is_ConstraintCast()) {
943 in = in->in(1);
944 continue;
945 } else if (in->is_AddP()) {
946 assert(!in->in(AddPNode::Address)->is_top(), "no raw memory access");
947 in = in->in(AddPNode::Address);
948 continue;
949 } else if (in->is_Con() && !ShenandoahBarriersForConst) {
950 if (trace) {tty->print("Found constant"); in->dump();}
951 } else if (in->is_ShenandoahBarrier()) {
952 if (t == ShenandoahStore && in->Opcode() != Op_ShenandoahWriteBarrier) {
953 return false;
954 }
955 barriers_used.push(in);
956 if (trace) {tty->print("Found barrier"); in->dump();}
957 } else if (in->is_Proj() && in->in(0)->is_Allocate()) {
958 if (trace) {tty->print("Found alloc"); in->in(0)->dump();}
959 } else if (in->is_Phi()) {
960 if (!visited.test_set(in->_idx)) {
961 if (trace) {tty->print("Pushed phi:"); in->dump();}
962 phis.push(in, 2);
963 in = in->in(1);
964 continue;
965 }
966 if (trace) {tty->print("Already seen phi:"); in->dump();}
967 } else if (in->Opcode() == Op_CMoveP || in->Opcode() == Op_CMoveN) {
968 if (!visited.test_set(in->_idx)) {
969 if (trace) {tty->print("Pushed cmovep:"); in->dump();}
970 phis.push(in, CMoveNode::IfTrue);
971 in = in->in(CMoveNode::IfFalse);
972 continue;
973 }
974 if (trace) {tty->print("Already seen cmovep:"); in->dump();}
975 } else if (in->Opcode() == Op_EncodeP || in->Opcode() == Op_DecodeN) {
976 in = in->in(1);
977 continue;
978 } else {
979 return false;
980 }
981 }
982 bool cont = false;
983 while (phis.is_nonempty()) {
984 uint idx = phis.index();
985 Node* phi = phis.node();
986 if (idx >= phi->req()) {
987 if (trace) {tty->print("Popped phi:"); phi->dump();}
988 phis.pop();
989 continue;
990 }
991 if (trace) {tty->print("Next entry(%d) for phi:", idx); phi->dump();}
992 in = phi->in(idx);
993 phis.set_index(idx+1);
994 cont = true;
995 break;
996 }
997 if (!cont) {
998 break;
999 }
1000 }
1001 return true;
1002 }
1003
1004 void ShenandoahBarrierNode::report_verify_failure(const char *msg, Node *n1, Node *n2) {
1005 if (n1 != NULL) {
1006 n1->dump(+10);
1007 }
1008 if (n2 != NULL) {
1009 n2->dump(+10);
1010 }
1011 fatal("%s", msg);
1012 }
1013
1014 void ShenandoahBarrierNode::verify(RootNode* root) {
1015 ResourceMark rm;
1016 Unique_Node_List wq;
1017 GrowableArray<Node*> barriers;
1018 Unique_Node_List barriers_used;
1019 Node_Stack phis(0);
1020 VectorSet visited(Thread::current()->resource_area());
1021 const bool trace = false;
1022 const bool verify_no_useless_barrier = false;
1023
1024 wq.push(root);
1025 for (uint next = 0; next < wq.size(); next++) {
1026 Node *n = wq.at(next);
1027 if (n->is_Load()) {
1028 const bool trace = false;
1029 if (trace) {tty->print("Verifying"); n->dump();}
1030 if (n->Opcode() == Op_LoadRange || n->Opcode() == Op_LoadKlass || n->Opcode() == Op_LoadNKlass) {
1031 if (trace) {tty->print_cr("Load range/klass");}
1032 } else {
1033 const TypePtr* adr_type = n->as_Load()->adr_type();
1034
1035 if (adr_type->isa_oopptr() && adr_type->is_oopptr()->offset() == oopDesc::mark_offset_in_bytes()) {
1036 if (trace) {tty->print_cr("Mark load");}
1037 } else if (adr_type->isa_instptr() &&
1038 adr_type->is_instptr()->klass()->is_subtype_of(Compile::current()->env()->Reference_klass()) &&
1039 adr_type->is_instptr()->offset() == java_lang_ref_Reference::referent_offset) {
1040 if (trace) {tty->print_cr("Reference.get()");}
1041 } else {
1042 bool verify = true;
1043 if (adr_type->isa_instptr()) {
1044 const TypeInstPtr* tinst = adr_type->is_instptr();
1045 ciKlass* k = tinst->klass();
1046 assert(k->is_instance_klass(), "");
1047 ciInstanceKlass* ik = (ciInstanceKlass*)k;
1048 int offset = adr_type->offset();
1049
1050 if ((ik->debug_final_field_at(offset) && ShenandoahOptimizeInstanceFinals) ||
1051 (ik->debug_stable_field_at(offset) && ShenandoahOptimizeStableFinals)) {
1052 if (trace) {tty->print_cr("Final/stable");}
1053 verify = false;
1054 } else if (k == ciEnv::current()->Class_klass() &&
1055 tinst->const_oop() != NULL &&
1056 tinst->offset() >= (ik->size_helper() * wordSize)) {
1057 ciInstanceKlass* k = tinst->const_oop()->as_instance()->java_lang_Class_klass()->as_instance_klass();
1058 ciField* field = k->get_field_by_offset(tinst->offset(), true);
1059 if ((ShenandoahOptimizeStaticFinals && field->is_final()) ||
1060 (ShenandoahOptimizeStableFinals && field->is_stable())) {
1061 verify = false;
1062 }
1063 }
1064 }
1065
1066 if (verify && !ShenandoahBarrierNode::verify_helper(n->in(MemNode::Address), phis, visited, ShenandoahLoad, trace, barriers_used)) {
1067 report_verify_failure("Shenandoah verification: Load should have barriers", n);
1068 }
1069 }
1070 }
1071 } else if (n->is_Store()) {
1072 const bool trace = false;
1073
1074 if (trace) {tty->print("Verifying"); n->dump();}
1075 if (n->in(MemNode::ValueIn)->bottom_type()->make_oopptr()) {
1076 Node* adr = n->in(MemNode::Address);
1077 bool verify = true;
1078
1079 if (adr->is_AddP() && adr->in(AddPNode::Base)->is_top()) {
1080 adr = adr->in(AddPNode::Address);
1081 if (adr->is_AddP()) {
1082 assert(adr->in(AddPNode::Base)->is_top(), "");
1083 adr = adr->in(AddPNode::Address);
1084 if (adr->Opcode() == Op_LoadP &&
1085 adr->in(MemNode::Address)->in(AddPNode::Base)->is_top() &&
1086 adr->in(MemNode::Address)->in(AddPNode::Address)->Opcode() == Op_ThreadLocal &&
1087 adr->in(MemNode::Address)->in(AddPNode::Offset)->find_intptr_t_con(-1) == in_bytes(ShenandoahThreadLocalData::satb_mark_queue_buffer_offset())) {
1088 if (trace) {tty->print_cr("SATB prebarrier");}
1089 verify = false;
1090 }
1091 }
1092 }
1093
1094 if (verify && !ShenandoahBarrierNode::verify_helper(n->in(MemNode::ValueIn), phis, visited, ShenandoahValue, trace, barriers_used)) {
1095 report_verify_failure("Shenandoah verification: Store should have barriers", n);
1096 }
1097 }
1098 if (!ShenandoahBarrierNode::verify_helper(n->in(MemNode::Address), phis, visited, ShenandoahStore, trace, barriers_used)) {
1099 report_verify_failure("Shenandoah verification: Store (address) should have barriers", n);
1100 }
1101 } else if (n->Opcode() == Op_CmpP) {
1102 const bool trace = false;
1103
1104 Node* in1 = n->in(1);
1105 Node* in2 = n->in(2);
1106 if (in1->bottom_type()->isa_oopptr()) {
1107 if (trace) {tty->print("Verifying"); n->dump();}
1108
1109 bool mark_inputs = false;
1110 if (in1->bottom_type() == TypePtr::NULL_PTR || in2->bottom_type() == TypePtr::NULL_PTR ||
1111 ((in1->is_Con() || in2->is_Con()) && !ShenandoahBarriersForConst)) {
1112 if (trace) {tty->print_cr("Comparison against a constant");}
1113 mark_inputs = true;
1114 } else if ((in1->is_CheckCastPP() && in1->in(1)->is_Proj() && in1->in(1)->in(0)->is_Allocate()) ||
1115 (in2->is_CheckCastPP() && in2->in(1)->is_Proj() && in2->in(1)->in(0)->is_Allocate())) {
1116 if (trace) {tty->print_cr("Comparison with newly alloc'ed object");}
1117 mark_inputs = true;
1118 } else {
1119 assert(in2->bottom_type()->isa_oopptr(), "");
1120
1121 if (!ShenandoahBarrierNode::verify_helper(in1, phis, visited, ShenandoahStore, trace, barriers_used) ||
1122 !ShenandoahBarrierNode::verify_helper(in2, phis, visited, ShenandoahStore, trace, barriers_used)) {
1123 report_verify_failure("Shenandoah verification: Cmp should have barriers", n);
1124 }
1125 }
1126 if (verify_no_useless_barrier &&
1127 mark_inputs &&
1128 (!ShenandoahBarrierNode::verify_helper(in1, phis, visited, ShenandoahValue, trace, barriers_used) ||
1129 !ShenandoahBarrierNode::verify_helper(in2, phis, visited, ShenandoahValue, trace, barriers_used))) {
1130 phis.clear();
1131 visited.Reset();
1132 }
1133 }
1134 } else if (n->is_LoadStore()) {
1135 if (n->in(MemNode::ValueIn)->bottom_type()->isa_ptr() &&
1136 !ShenandoahBarrierNode::verify_helper(n->in(MemNode::ValueIn), phis, visited, ShenandoahLoad, trace, barriers_used)) {
1137 report_verify_failure("Shenandoah verification: LoadStore (value) should have barriers", n);
1138 }
1139
1140 if (n->in(MemNode::Address)->bottom_type()->isa_oopptr() && !ShenandoahBarrierNode::verify_helper(n->in(MemNode::Address), phis, visited, ShenandoahStore, trace, barriers_used)) {
1141 report_verify_failure("Shenandoah verification: LoadStore (address) should have barriers", n);
1142 }
1143 } else if (n->Opcode() == Op_CallLeafNoFP || n->Opcode() == Op_CallLeaf) {
1144 CallNode* call = n->as_Call();
1145
1146 static struct {
1147 const char* name;
1148 struct {
1149 int pos;
1150 verify_type t;
1151 } args[6];
1152 } calls[] = {
1153 "aescrypt_encryptBlock",
1154 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad },
1155 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1156 "aescrypt_decryptBlock",
1157 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad },
1158 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1159 "multiplyToLen",
1160 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+2, ShenandoahLoad }, { TypeFunc::Parms+4, ShenandoahStore },
1161 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1162 "squareToLen",
1163 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+2, ShenandoahLoad }, { -1, ShenandoahNone},
1164 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1165 "montgomery_multiply",
1166 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahLoad }, { TypeFunc::Parms+2, ShenandoahLoad },
1167 { TypeFunc::Parms+6, ShenandoahStore }, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1168 "montgomery_square",
1169 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahLoad }, { TypeFunc::Parms+5, ShenandoahStore },
1170 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1171 "mulAdd",
1172 { { TypeFunc::Parms, ShenandoahStore }, { TypeFunc::Parms+1, ShenandoahLoad }, { -1, ShenandoahNone},
1173 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1174 "vectorizedMismatch",
1175 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahLoad }, { -1, ShenandoahNone},
1176 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1177 "updateBytesCRC32",
1178 { { TypeFunc::Parms+1, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone},
1179 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1180 "updateBytesAdler32",
1181 { { TypeFunc::Parms+1, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone},
1182 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1183 "updateBytesCRC32C",
1184 { { TypeFunc::Parms+1, ShenandoahLoad }, { TypeFunc::Parms+3, ShenandoahLoad}, { -1, ShenandoahNone},
1185 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1186 "counterMode_AESCrypt",
1187 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad },
1188 { TypeFunc::Parms+3, ShenandoahStore }, { TypeFunc::Parms+5, ShenandoahStore }, { TypeFunc::Parms+6, ShenandoahStore } },
1189 "cipherBlockChaining_encryptAESCrypt",
1190 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad },
1191 { TypeFunc::Parms+3, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1192 "cipherBlockChaining_decryptAESCrypt",
1193 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { TypeFunc::Parms+2, ShenandoahLoad },
1194 { TypeFunc::Parms+3, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1195 "shenandoah_clone_barrier",
1196 { { TypeFunc::Parms, ShenandoahLoad }, { -1, ShenandoahNone}, { -1, ShenandoahNone},
1197 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1198 "ghash_processBlocks",
1199 { { TypeFunc::Parms, ShenandoahStore }, { TypeFunc::Parms+1, ShenandoahLoad }, { TypeFunc::Parms+2, ShenandoahLoad },
1200 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1201 "sha1_implCompress",
1202 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone },
1203 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1204 "sha256_implCompress",
1205 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone },
1206 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1207 "sha512_implCompress",
1208 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone },
1209 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1210 "sha1_implCompressMB",
1211 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone },
1212 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1213 "sha256_implCompressMB",
1214 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone },
1215 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1216 "sha512_implCompressMB",
1217 { { TypeFunc::Parms, ShenandoahLoad }, { TypeFunc::Parms+1, ShenandoahStore }, { -1, ShenandoahNone },
1218 { -1, ShenandoahNone}, { -1, ShenandoahNone}, { -1, ShenandoahNone} },
1219 };
1220
1221 if (call->is_call_to_arraycopystub()) {
1222 Node* dest = NULL;
1223 const TypeTuple* args = n->as_Call()->_tf->domain();
1224 for (uint i = TypeFunc::Parms, j = 0; i < args->cnt(); i++) {
1225 if (args->field_at(i)->isa_ptr()) {
1226 j++;
1227 if (j == 2) {
1228 dest = n->in(i);
1229 break;
1230 }
1231 }
1232 }
1233 if (!ShenandoahBarrierNode::verify_helper(n->in(TypeFunc::Parms), phis, visited, ShenandoahLoad, trace, barriers_used) ||
1234 !ShenandoahBarrierNode::verify_helper(dest, phis, visited, ShenandoahStore, trace, barriers_used)) {
1235 report_verify_failure("Shenandoah verification: ArrayCopy should have barriers", n);
1236 }
1237 } else if (strlen(call->_name) > 5 &&
1238 !strcmp(call->_name + strlen(call->_name) - 5, "_fill")) {
1239 if (!ShenandoahBarrierNode::verify_helper(n->in(TypeFunc::Parms), phis, visited, ShenandoahStore, trace, barriers_used)) {
1240 report_verify_failure("Shenandoah verification: _fill should have barriers", n);
1241 }
1242 } else if (!strcmp(call->_name, "g1_wb_pre")) {
1243 // skip
1244 } else {
1245 const int calls_len = sizeof(calls) / sizeof(calls[0]);
1246 int i = 0;
1247 for (; i < calls_len; i++) {
1248 if (!strcmp(calls[i].name, call->_name)) {
1249 break;
1250 }
1251 }
1252 if (i != calls_len) {
1253 const uint args_len = sizeof(calls[0].args) / sizeof(calls[0].args[0]);
1254 for (uint j = 0; j < args_len; j++) {
1255 int pos = calls[i].args[j].pos;
1256 if (pos == -1) {
1257 break;
1258 }
1259 if (!ShenandoahBarrierNode::verify_helper(call->in(pos), phis, visited, calls[i].args[j].t, trace, barriers_used)) {
1260 report_verify_failure("Shenandoah verification: intrinsic calls should have barriers", n);
1261 }
1262 }
1263 for (uint j = TypeFunc::Parms; j < call->req(); j++) {
1264 if (call->in(j)->bottom_type()->make_ptr() &&
1265 call->in(j)->bottom_type()->make_ptr()->isa_oopptr()) {
1266 uint k = 0;
1267 for (; k < args_len && calls[i].args[k].pos != (int)j; k++);
1268 if (k == args_len) {
1269 fatal("arg %d for call %s not covered", j, call->_name);
1270 }
1271 }
1272 }
1273 } else {
1274 for (uint j = TypeFunc::Parms; j < call->req(); j++) {
1275 if (call->in(j)->bottom_type()->make_ptr() &&
1276 call->in(j)->bottom_type()->make_ptr()->isa_oopptr()) {
1277 fatal("%s not covered", call->_name);
1278 }
1279 }
1280 }
1281 }
1282 } else if (n->is_ShenandoahBarrier()) {
1283 assert(!barriers.contains(n), "");
1284 assert(n->Opcode() != Op_ShenandoahWriteBarrier || n->find_out_with(Op_ShenandoahWBMemProj) != NULL, "bad shenandoah write barrier");
1285 assert(n->Opcode() != Op_ShenandoahWriteBarrier || n->outcnt() > 1, "bad shenandoah write barrier");
1286 barriers.push(n);
1287 } else if (n->is_AddP()
1288 || n->is_Phi()
1289 || n->is_ConstraintCast()
1290 || n->Opcode() == Op_Return
1291 || n->Opcode() == Op_CMoveP
1292 || n->Opcode() == Op_CMoveN
1293 || n->Opcode() == Op_Rethrow
1294 || n->is_MemBar()
1295 || n->Opcode() == Op_Conv2B
1296 || n->Opcode() == Op_SafePoint
1297 || n->is_CallJava()
1298 || n->Opcode() == Op_Unlock
1299 || n->Opcode() == Op_EncodeP
1300 || n->Opcode() == Op_DecodeN) {
1301 // nothing to do
1302 } else {
1303 static struct {
1304 int opcode;
1305 struct {
1306 int pos;
1307 verify_type t;
1308 } inputs[2];
1309 } others[] = {
1310 Op_FastLock,
1311 { { 1, ShenandoahLoad }, { -1, ShenandoahNone} },
1312 Op_Lock,
1313 { { TypeFunc::Parms, ShenandoahLoad }, { -1, ShenandoahNone} },
1314 Op_ArrayCopy,
1315 { { ArrayCopyNode::Src, ShenandoahLoad }, { ArrayCopyNode::Dest, ShenandoahStore } },
1316 Op_StrCompressedCopy,
1317 { { 2, ShenandoahLoad }, { 3, ShenandoahStore } },
1318 Op_StrInflatedCopy,
1319 { { 2, ShenandoahLoad }, { 3, ShenandoahStore } },
1320 Op_AryEq,
1321 { { 2, ShenandoahLoad }, { 3, ShenandoahLoad } },
1322 Op_StrIndexOf,
1323 { { 2, ShenandoahLoad }, { 4, ShenandoahLoad } },
1324 Op_StrComp,
1325 { { 2, ShenandoahLoad }, { 4, ShenandoahLoad } },
1326 Op_StrEquals,
1327 { { 2, ShenandoahLoad }, { 3, ShenandoahLoad } },
1328 Op_EncodeISOArray,
1329 { { 2, ShenandoahLoad }, { 3, ShenandoahStore } },
1330 Op_HasNegatives,
1331 { { 2, ShenandoahLoad }, { -1, ShenandoahNone} },
1332 Op_CastP2X,
1333 { { 1, ShenandoahLoad }, { -1, ShenandoahNone} },
1334 Op_StrIndexOfChar,
1335 { { 2, ShenandoahLoad }, { -1, ShenandoahNone } },
1336 };
1337
1338 const int others_len = sizeof(others) / sizeof(others[0]);
1339 int i = 0;
1340 for (; i < others_len; i++) {
1341 if (others[i].opcode == n->Opcode()) {
1342 break;
1343 }
1344 }
1345 uint stop = n->is_Call() ? n->as_Call()->tf()->domain()->cnt() : n->req();
1346 if (i != others_len) {
1347 const uint inputs_len = sizeof(others[0].inputs) / sizeof(others[0].inputs[0]);
1348 for (uint j = 0; j < inputs_len; j++) {
1349 int pos = others[i].inputs[j].pos;
1350 if (pos == -1) {
1351 break;
1352 }
1353 if (!ShenandoahBarrierNode::verify_helper(n->in(pos), phis, visited, others[i].inputs[j].t, trace, barriers_used)) {
1354 report_verify_failure("Shenandoah verification: intrinsic calls should have barriers", n);
1355 }
1356 }
1357 for (uint j = 1; j < stop; j++) {
1358 if (n->in(j) != NULL && n->in(j)->bottom_type()->make_ptr() &&
1359 n->in(j)->bottom_type()->make_ptr()->make_oopptr()) {
1360 uint k = 0;
1361 for (; k < inputs_len && others[i].inputs[k].pos != (int)j; k++);
1362 if (k == inputs_len) {
1363 fatal("arg %d for node %s not covered", j, n->Name());
1364 }
1365 }
1366 }
1367 } else {
1368 for (uint j = 1; j < stop; j++) {
1369 if (n->in(j) != NULL && n->in(j)->bottom_type()->make_ptr() &&
1370 n->in(j)->bottom_type()->make_ptr()->make_oopptr()) {
1371 fatal("%s not covered", n->Name());
1372 }
1373 }
1374 }
1375 }
1376
1377 if (n->is_SafePoint()) {
1378 SafePointNode* sfpt = n->as_SafePoint();
1379 if (verify_no_useless_barrier && sfpt->jvms() != NULL) {
1380 for (uint i = sfpt->jvms()->scloff(); i < sfpt->jvms()->endoff(); i++) {
1381 if (!ShenandoahBarrierNode::verify_helper(sfpt->in(i), phis, visited, ShenandoahLoad, trace, barriers_used)) {
1382 phis.clear();
1383 visited.Reset();
1384 }
1385 }
1386 }
1387 }
1388 for( uint i = 0; i < n->len(); ++i ) {
1389 Node *m = n->in(i);
1390 if (m == NULL) continue;
1391
1392 // In most cases, inputs should be known to be non null. If it's
1393 // not the case, it could be a missing cast_not_null() in an
1394 // intrinsic or support might be needed in AddPNode::Ideal() to
1395 // avoid a NULL+offset input.
1396 if (!(n->is_Phi() ||
1397 (n->is_SafePoint() && (!n->is_CallRuntime() || !strcmp(n->as_Call()->_name, "g1_wb_pre") || !strcmp(n->as_Call()->_name, "unsafe_arraycopy"))) ||
1398 n->Opcode() == Op_CmpP ||
1399 n->Opcode() == Op_CmpN ||
1400 (n->Opcode() == Op_StoreP && i == StoreNode::ValueIn) ||
1401 (n->Opcode() == Op_StoreN && i == StoreNode::ValueIn) ||
1402 n->is_ConstraintCast() ||
1403 n->Opcode() == Op_Return ||
1404 n->Opcode() == Op_Conv2B ||
1405 n->is_AddP() ||
1406 n->Opcode() == Op_CMoveP ||
1407 n->Opcode() == Op_CMoveN ||
1408 n->Opcode() == Op_Rethrow ||
1409 n->is_MemBar() ||
1410 n->is_Mem() ||
1411 n->Opcode() == Op_AryEq ||
1412 n->Opcode() == Op_SCMemProj ||
1413 n->Opcode() == Op_EncodeP ||
1414 n->Opcode() == Op_DecodeN)) {
1415 if (m->bottom_type()->make_oopptr() && m->bottom_type()->make_oopptr()->meet(TypePtr::NULL_PTR) == m->bottom_type()) {
1416 report_verify_failure("Shenandoah verification: null input", n, m);
1417 }
1418 }
1419
1420 wq.push(m);
1421 }
1422 }
1423
1424 if (verify_no_useless_barrier) {
1425 for (int i = 0; i < barriers.length(); i++) {
1426 Node* n = barriers.at(i);
1427 if (!barriers_used.member(n)) {
1428 tty->print("XXX useless barrier"); n->dump(-2);
1429 ShouldNotReachHere();
1430 }
1431 }
1432 }
1433 }
1434 #endif
1435
1436 MergeMemNode* ShenandoahWriteBarrierNode::allocate_merge_mem(Node* mem, int alias, Node* rep_proj, Node* rep_ctrl, PhaseIdealLoop* phase) {
1437 MergeMemNode* mm = MergeMemNode::make(mem);
1438 mm->set_memory_at(alias, rep_proj);
1439 phase->register_new_node(mm, rep_ctrl);
1440 return mm;
1441 }
1442
1443 MergeMemNode* ShenandoahWriteBarrierNode::clone_merge_mem(Node* u, Node* mem, int alias, Node* rep_proj, Node* rep_ctrl, DUIterator& i, PhaseIdealLoop* phase) {
1444 MergeMemNode* newmm = NULL;
1445 MergeMemNode* u_mm = u->as_MergeMem();
1446 Node* c = phase->get_ctrl(u);
1447 if (phase->is_dominator(c, rep_ctrl)) {
1448 c = rep_ctrl;
1449 } else {
1450 assert(phase->is_dominator(rep_ctrl, c), "one must dominate the other");
1451 }
1452 if (u->outcnt() == 1) {
1453 if (u->req() > (uint)alias && u->in(alias) == mem) {
1454 phase->igvn().replace_input_of(u, alias, rep_proj);
1455 --i;
1456 } else {
1457 phase->igvn().rehash_node_delayed(u);
1458 u_mm->set_memory_at(alias, rep_proj);
1459 }
1460 newmm = u_mm;
1461 phase->set_ctrl_and_loop(u, c);
1462 } else {
1463 // can't simply clone u and then change one of its input because
1464 // it adds and then removes an edge which messes with the
1465 // DUIterator
1466 newmm = MergeMemNode::make(u_mm->base_memory());
1467 for (uint j = 0; j < u->req(); j++) {
1468 if (j < newmm->req()) {
1469 if (j == (uint)alias) {
1470 newmm->set_req(j, rep_proj);
1471 } else if (newmm->in(j) != u->in(j)) {
1472 newmm->set_req(j, u->in(j));
1473 }
1474 } else if (j == (uint)alias) {
1475 newmm->add_req(rep_proj);
1476 } else {
1477 newmm->add_req(u->in(j));
1478 }
1479 }
1480 if ((uint)alias >= u->req()) {
1481 newmm->set_memory_at(alias, rep_proj);
1482 }
1483 phase->register_new_node(newmm, c);
1484 }
1485 return newmm;
1486 }
1487
1488 bool ShenandoahWriteBarrierNode::should_process_phi(Node* phi, int alias, Compile* C) {
1489 if (phi->adr_type() == TypePtr::BOTTOM) {
1490 Node* region = phi->in(0);
1491 for (DUIterator_Fast jmax, j = region->fast_outs(jmax); j < jmax; j++) {
1492 Node* uu = region->fast_out(j);
1493 if (uu->is_Phi() && uu != phi && uu->bottom_type() == Type::MEMORY && C->get_alias_index(uu->adr_type()) == alias) {
1494 return false;
1495 }
1496 }
1497 return true;
1498 }
1499 return C->get_alias_index(phi->adr_type()) == alias;
1500 }
1501
1502 bool ShenandoahBarrierNode::is_dominator_same_ctrl(Node*c, Node* d, Node* n, PhaseIdealLoop* phase) {
1503 // That both nodes have the same control is not sufficient to prove
1504 // domination, verify that there's no path from d to n
1505 ResourceMark rm;
1506 Unique_Node_List wq;
1507 wq.push(d);
1508 for (uint next = 0; next < wq.size(); next++) {
1509 Node *m = wq.at(next);
1510 if (m == n) {
1511 return false;
1512 }
1513 if (m->is_Phi() && m->in(0)->is_Loop()) {
1514 assert(phase->ctrl_or_self(m->in(LoopNode::EntryControl)) != c, "following loop entry should lead to new control");
1515 } else {
1516 for (uint i = 0; i < m->req(); i++) {
1517 if (m->in(i) != NULL && phase->ctrl_or_self(m->in(i)) == c) {
1518 wq.push(m->in(i));
1519 }
1520 }
1521 }
1522 }
1523 return true;
1524 }
1525
1526 bool ShenandoahBarrierNode::is_dominator(Node *d_c, Node *n_c, Node* d, Node* n, PhaseIdealLoop* phase) {
1527 if (d_c != n_c) {
1528 return phase->is_dominator(d_c, n_c);
1529 }
1530 return is_dominator_same_ctrl(d_c, d, n, phase);
1531 }
1532
1533 Node* next_mem(Node* mem, int alias) {
1534 Node* res = NULL;
1535 if (mem->is_Proj()) {
1536 res = mem->in(0);
1537 } else if (mem->is_SafePoint() || mem->is_MemBar()) {
1538 res = mem->in(TypeFunc::Memory);
1539 } else if (mem->is_Phi()) {
1540 res = mem->in(1);
1541 } else if (mem->is_ShenandoahBarrier()) {
1542 res = mem->in(ShenandoahBarrierNode::Memory);
1543 } else if (mem->is_MergeMem()) {
1544 res = mem->as_MergeMem()->memory_at(alias);
1545 } else if (mem->is_Store() || mem->is_LoadStore() || mem->is_ClearArray()) {
1546 assert(alias = Compile::AliasIdxRaw, "following raw memory can't lead to a barrier");
1547 res = mem->in(MemNode::Memory);
1548 } else {
1549 #ifdef ASSERT
1550 mem->dump();
1551 #endif
1552 ShouldNotReachHere();
1553 }
1554 return res;
1555 }
1556
1557 bool suitable_mem(Node* mem, Node* old_mem, Node* rep_proj) {
1558 for (DUIterator_Fast imax, i = mem->fast_outs(imax); i < imax; i++) {
1559 Node* u = mem->fast_out(i);
1560 if (u->is_MergeMem()) {
1561 if (u->has_out_with(Op_MergeMem)) {
1562 // too complicated for now
1563 return false;
1564 }
1565 if (old_mem == u && rep_proj->has_out_with(Op_MergeMem)) {
1566 return false;
1567 }
1568 }
1569 if (u->Opcode() == Op_Unlock && mem->is_Proj() && mem->in(0)->Opcode() == Op_MemBarReleaseLock) {
1570 // would require a merge mem between unlock and the
1571 // preceding membar. Would confuse logic that eliminates
1572 // lock/unlock nodes.
1573 return false;
1574 }
1575 }
1576 return true;
1577 }
1578
1579 void ShenandoahWriteBarrierNode::fix_memory_uses(Node* mem, Node* replacement, Node* rep_proj, Node* rep_ctrl, int alias, PhaseIdealLoop* phase) {
1580 uint last =phase-> C->unique();
1581 MergeMemNode* mm = NULL;
1582 assert(mem->bottom_type() == Type::MEMORY, "");
1583 for (DUIterator i = mem->outs(); mem->has_out(i); i++) {
1584 Node* u = mem->out(i);
1585 if (u != replacement && u->_idx < last) {
1586 if (u->is_ShenandoahBarrier() && alias != Compile::AliasIdxRaw) {
1587 if (phase->C->get_alias_index(u->adr_type()) == alias && is_dominator(rep_ctrl, phase->ctrl_or_self(u), replacement, u, phase)) {
1588 phase->igvn().replace_input_of(u, u->find_edge(mem), rep_proj);
1589 assert(u->find_edge(mem) == -1, "only one edge");
1590 --i;
1591 }
1592 } else if (u->is_Mem()) {
1593 if (phase->C->get_alias_index(u->adr_type()) == alias && is_dominator(rep_ctrl, phase->ctrl_or_self(u), replacement, u, phase)) {
1594 assert(alias == Compile::AliasIdxRaw , "only raw memory can lead to a memory operation");
1595 phase->igvn().replace_input_of(u, u->find_edge(mem), rep_proj);
1596 assert(u->find_edge(mem) == -1, "only one edge");
1597 --i;
1598 }
1599 } else if (u->is_MergeMem()) {
1600 MergeMemNode* u_mm = u->as_MergeMem();
1601 if (u_mm->memory_at(alias) == mem) {
1602 MergeMemNode* newmm = NULL;
1603 for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) {
1604 Node* uu = u->fast_out(j);
1605 assert(!uu->is_MergeMem(), "chain of MergeMems?");
1606 if (uu->is_Phi()) {
1607 if (should_process_phi(uu, alias, phase->C)) {
1608 Node* region = uu->in(0);
1609 int nb = 0;
1610 for (uint k = 1; k < uu->req(); k++) {
1611 if (uu->in(k) == u && phase->is_dominator(rep_ctrl, region->in(k))) {
1612 if (newmm == NULL) {
1613 newmm = clone_merge_mem(u, mem, alias, rep_proj, rep_ctrl, i, phase);
1614 }
1615 if (newmm != u) {
1616 phase->igvn().replace_input_of(uu, k, newmm);
1617 nb++;
1618 --jmax;
1619 }
1620 }
1621 }
1622 if (nb > 0) {
1623 --j;
1624 }
1625 }
1626 } else {
1627 if (rep_ctrl != uu && is_dominator(rep_ctrl, phase->ctrl_or_self(uu), replacement, uu, phase)) {
1628 if (newmm == NULL) {
1629 newmm = clone_merge_mem(u, mem, alias, rep_proj, rep_ctrl, i, phase);
1630 }
1631 if (newmm != u) {
1632 phase->igvn().replace_input_of(uu, uu->find_edge(u), newmm);
1633 --j, --jmax;
1634 }
1635 }
1636 }
1637 }
1638 }
1639 } else if (u->is_Phi()) {
1640 assert(u->bottom_type() == Type::MEMORY, "what else?");
1641 Node* region = u->in(0);
1642 if (should_process_phi(u, alias, phase->C)) {
1643 bool replaced = false;
1644 for (uint j = 1; j < u->req(); j++) {
1645 if (u->in(j) == mem && phase->is_dominator(rep_ctrl, region->in(j))) {
1646 Node* nnew = rep_proj;
1647 if (u->adr_type() == TypePtr::BOTTOM) {
1648 if (mm == NULL) {
1649 mm = allocate_merge_mem(mem, alias, rep_proj, rep_ctrl, phase);
1650 }
1651 nnew = mm;
1652 }
1653 phase->igvn().replace_input_of(u, j, nnew);
1654 replaced = true;
1655 }
1656 }
1657 if (replaced) {
1658 --i;
1659 }
1660
1661 }
1662 } else if ((u->adr_type() == TypePtr::BOTTOM && u->Opcode() != Op_StrInflatedCopy) ||
1663 u->adr_type() == NULL) {
1664 assert(u->adr_type() != NULL ||
1665 u->Opcode() == Op_Rethrow ||
1666 u->Opcode() == Op_Return ||
1667 u->Opcode() == Op_SafePoint ||
1668 (u->is_CallStaticJava() && u->as_CallStaticJava()->uncommon_trap_request() != 0) ||
1669 (u->is_CallStaticJava() && u->as_CallStaticJava()->_entry_point == OptoRuntime::rethrow_stub()) ||
1670 u->Opcode() == Op_CallLeaf, "");
1671 if (is_dominator(rep_ctrl, phase->ctrl_or_self(u), replacement, u, phase)) {
1672 if (mm == NULL) {
1673 mm = allocate_merge_mem(mem, alias, rep_proj, rep_ctrl, phase);
1674 }
1675 phase->igvn().replace_input_of(u, u->find_edge(mem), mm);
1676 --i;
1677 }
1678 } else if (phase->C->get_alias_index(u->adr_type()) == alias) {
1679 if (is_dominator(rep_ctrl, phase->ctrl_or_self(u), replacement, u, phase)) {
1680 phase->igvn().replace_input_of(u, u->find_edge(mem), rep_proj);
1681 --i;
1682 }
1683 }
1684 }
1685 }
1686 }
1687
1688 Node* ShenandoahBarrierNode::no_branches(Node* c, Node* dom, bool allow_one_proj, PhaseIdealLoop* phase) {
1689 Node* iffproj = NULL;
1690 while (c != dom) {
1691 Node* next = phase->idom(c);
1692 assert(next->unique_ctrl_out() == c || c->is_Proj() || c->is_Region(), "multiple control flow out but no proj or region?");
1693 if (c->is_Region()) {
1694 ResourceMark rm;
1695 Unique_Node_List wq;
1696 wq.push(c);
1697 for (uint i = 0; i < wq.size(); i++) {
1698 Node *n = wq.at(i);
1699 if (n->is_Region()) {
1700 for (uint j = 1; j < n->req(); j++) {
1701 if (n->in(j) != next) {
1702 wq.push(n->in(j));
1703 }
1704 }
1705 } else {
1706 if (n->in(0) != next) {
1707 wq.push(n->in(0));
1708 }
1709 }
1710 }
1711 for (DUIterator_Fast imax, i = next->fast_outs(imax); i < imax; i++) {
1712 Node* u = next->fast_out(i);
1713 if (u->is_CFG()) {
1714 if (!wq.member(u)) {
1715 return NodeSentinel;
1716 }
1717 }
1718 }
1719
1720 } else if (c->is_Proj()) {
1721 if (c->is_IfProj()) {
1722 if (c->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none) != NULL) {
1723 // continue;
1724 } else {
1725 if (!allow_one_proj) {
1726 return NodeSentinel;
1727 }
1728 if (iffproj == NULL) {
1729 iffproj = c;
1730 } else {
1731 return NodeSentinel;
1732 }
1733 }
1734 } else if (c->Opcode() == Op_JumpProj) {
1735 return NodeSentinel; // unsupported
1736 } else if (c->Opcode() == Op_CatchProj) {
1737 return NodeSentinel; // unsupported
1738 } else if (c->Opcode() == Op_CProj && next->Opcode() == Op_NeverBranch) {
1739 return NodeSentinel; // unsupported
1740 } else {
1741 assert(next->unique_ctrl_out() == c, "unsupported branch pattern");
1742 }
1743 }
1744 c = next;
1745 }
1746 return iffproj;
1747 }
1748
1749 #ifdef ASSERT
1750 void ShenandoahWriteBarrierNode::memory_dominates_all_paths_helper(Node* c, Node* rep_ctrl, Unique_Node_List& controls, PhaseIdealLoop* phase) {
1751 const bool trace = false;
1752 if (trace) { tty->print("X control is"); c->dump(); }
1753
1754 uint start = controls.size();
1755 controls.push(c);
1756 for (uint i = start; i < controls.size(); i++) {
1757 Node *n = controls.at(i);
1758
1759 if (trace) { tty->print("X from"); n->dump(); }
1760
1761 if (n == rep_ctrl) {
1762 continue;
1763 }
1764
1765 if (n->is_Proj()) {
1766 Node* n_dom = n->in(0);
1767 IdealLoopTree* n_dom_loop = phase->get_loop(n_dom);
1768 if (n->is_IfProj() && n_dom->outcnt() == 2) {
1769 n_dom_loop = phase->get_loop(n_dom->as_If()->proj_out(n->as_Proj()->_con == 0 ? 1 : 0));
1770 }
1771 if (n_dom_loop != phase->ltree_root()) {
1772 Node* tail = n_dom_loop->tail();
1773 if (tail->is_Region()) {
1774 for (uint j = 1; j < tail->req(); j++) {
1775 if (phase->is_dominator(n_dom, tail->in(j)) && !phase->is_dominator(n, tail->in(j))) {
1776 assert(phase->is_dominator(rep_ctrl, tail->in(j)), "why are we here?");
1777 // entering loop from below, mark backedge
1778 if (trace) { tty->print("X pushing backedge"); tail->in(j)->dump(); }
1779 controls.push(tail->in(j));
1780 //assert(n->in(0) == n_dom, "strange flow control");
1781 }
1782 }
1783 } else if (phase->get_loop(n) != n_dom_loop && phase->is_dominator(n_dom, tail)) {
1784 // entering loop from below, mark backedge
1785 if (trace) { tty->print("X pushing backedge"); tail->dump(); }
1786 controls.push(tail);
1787 //assert(n->in(0) == n_dom, "strange flow control");
1788 }
1789 }
1790 }
1791
1792 if (n->is_Loop()) {
1793 Node* c = n->in(LoopNode::EntryControl);
1794 if (trace) { tty->print("X pushing"); c->dump(); }
1795 controls.push(c);
1796 } else if (n->is_Region()) {
1797 for (uint i = 1; i < n->req(); i++) {
1798 Node* c = n->in(i);
1799 if (trace) { tty->print("X pushing"); c->dump(); }
1800 controls.push(c);
1801 }
1802 } else {
1803 Node* c = n->in(0);
1804 if (trace) { tty->print("X pushing"); c->dump(); }
1805 controls.push(c);
1806 }
1807 }
1808 }
1809
1810 bool ShenandoahWriteBarrierNode::memory_dominates_all_paths(Node* mem, Node* rep_ctrl, int alias, PhaseIdealLoop* phase) {
1811 const bool trace = false;
1812 if (trace) {
1813 tty->print("XXX mem is"); mem->dump();
1814 tty->print("XXX rep ctrl is"); rep_ctrl->dump();
1815 tty->print_cr("XXX alias is %d", alias);
1816 }
1817 ResourceMark rm;
1818 Unique_Node_List wq;
1819 Unique_Node_List controls;
1820 wq.push(mem);
1821 for (uint next = 0; next < wq.size(); next++) {
1822 Node *nn = wq.at(next);
1823 if (trace) { tty->print("XX from mem"); nn->dump(); }
1824 assert(nn->bottom_type() == Type::MEMORY, "memory only");
1825
1826 if (nn->is_Phi()) {
1827 Node* r = nn->in(0);
1828 for (DUIterator_Fast jmax, j = r->fast_outs(jmax); j < jmax; j++) {
1829 Node* u = r->fast_out(j);
1830 if (u->is_Phi() && u->bottom_type() == Type::MEMORY && u != nn &&
1831 (u->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(u->adr_type()) == alias)) {
1832 if (trace) { tty->print("XX Next mem (other phi)"); u->dump(); }
1833 wq.push(u);
1834 }
1835 }
1836 }
1837
1838 for (DUIterator_Fast imax, i = nn->fast_outs(imax); i < imax; i++) {
1839 Node* use = nn->fast_out(i);
1840
1841 if (trace) { tty->print("XX use %p", use->adr_type()); use->dump(); }
1842 if (use->is_CFG()) {
1843 assert(use->in(TypeFunc::Memory) == nn, "bad cfg node");
1844 Node* c = use->in(0);
1845 if (phase->is_dominator(rep_ctrl, c)) {
1846 memory_dominates_all_paths_helper(c, rep_ctrl, controls, phase);
1847 } else if (use->is_CallStaticJava() && use->as_CallStaticJava()->uncommon_trap_request() != 0 && c->is_Region()) {
1848 Node* region = c;
1849 if (trace) { tty->print("XX unc region"); region->dump(); }
1850 for (uint j = 1; j < region->req(); j++) {
1851 if (phase->is_dominator(rep_ctrl, region->in(j))) {
1852 if (trace) { tty->print("XX unc follows"); region->in(j)->dump(); }
1853 memory_dominates_all_paths_helper(region->in(j), rep_ctrl, controls, phase);
1854 }
1855 }
1856 }
1857 //continue;
1858 } else if (use->is_Phi()) {
1859 assert(use->bottom_type() == Type::MEMORY, "bad phi");
1860 if ((use->adr_type() == TypePtr::BOTTOM /*&& !shenandoah_has_alias_phi(C, use, alias)*/) ||
1861 phase->C->get_alias_index(use->adr_type()) == alias) {
1862 for (uint j = 1; j < use->req(); j++) {
1863 if (use->in(j) == nn) {
1864 Node* c = use->in(0)->in(j);
1865 if (phase->is_dominator(rep_ctrl, c)) {
1866 memory_dominates_all_paths_helper(c, rep_ctrl, controls, phase);
1867 }
1868 }
1869 }
1870 }
1871 // continue;
1872 }
1873
1874 if (use->is_MergeMem()) {
1875 if (use->as_MergeMem()->memory_at(alias) == nn) {
1876 if (trace) { tty->print("XX Next mem"); use->dump(); }
1877 // follow the memory edges
1878 wq.push(use);
1879 }
1880 } else if (use->is_Phi()) {
1881 assert(use->bottom_type() == Type::MEMORY, "bad phi");
1882 if ((use->adr_type() == TypePtr::BOTTOM /*&& !shenandoah_has_alias_phi(C, use, alias)*/) ||
1883 phase->C->get_alias_index(use->adr_type()) == alias) {
1884 if (trace) { tty->print("XX Next mem"); use->dump(); }
1885 // follow the memory edges
1886 wq.push(use);
1887 }
1888 } else if (use->bottom_type() == Type::MEMORY &&
1889 (use->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(use->adr_type()) == alias)) {
1890 if (trace) { tty->print("XX Next mem"); use->dump(); }
1891 // follow the memory edges
1892 wq.push(use);
1893 } else if ((use->is_SafePoint() || use->is_MemBar()) &&
1894 (use->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(use->adr_type()) == alias)) {
1895 for (DUIterator_Fast jmax, j = use->fast_outs(jmax); j < jmax; j++) {
1896 Node* u = use->fast_out(j);
1897 if (u->bottom_type() == Type::MEMORY) {
1898 if (trace) { tty->print("XX Next mem"); u->dump(); }
1899 // follow the memory edges
1900 wq.push(u);
1901 }
1902 }
1903 } else if (use->Opcode() == Op_ShenandoahWriteBarrier && phase->C->get_alias_index(use->adr_type()) == alias) {
1904 Node* m = use->find_out_with(Op_ShenandoahWBMemProj);
1905 if (m != NULL) {
1906 if (trace) { tty->print("XX Next mem"); m->dump(); }
1907 // follow the memory edges
1908 wq.push(m);
1909 }
1910 }
1911 }
1912 }
1913
1914 if (controls.size() == 0) {
1915 return false;
1916 }
1917
1918 for (uint i = 0; i < controls.size(); i++) {
1919 Node *n = controls.at(i);
1920
1921 if (trace) { tty->print("X checking"); n->dump(); }
1922
1923 if (n->unique_ctrl_out() != NULL) {
1924 continue;
1925 }
1926
1927 if (n->Opcode() == Op_NeverBranch) {
1928 Node* taken = n->as_Multi()->proj_out(0);
1929 if (!controls.member(taken)) {
1930 if (trace) { tty->print("X not seen"); taken->dump(); }
1931 return false;
1932 }
1933 continue;
1934 }
1935
1936 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
1937 Node* u = n->fast_out(j);
1938
1939 if (u->is_CFG()) {
1940 if (!controls.member(u)) {
1941 if (u->is_Proj() && u->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) {
1942 if (trace) { tty->print("X not seen but unc"); u->dump(); }
1943 } else {
1944 Node* c = u;
1945 do {
1946 c = c->unique_ctrl_out();
1947 } while (c != NULL && c->is_Region());
1948 if (c != NULL && c->Opcode() == Op_Halt) {
1949 if (trace) { tty->print("X not seen but halt"); c->dump(); }
1950 } else {
1951 if (trace) { tty->print("X not seen"); u->dump(); }
1952 return false;
1953 }
1954 }
1955 } else {
1956 if (trace) { tty->print("X seen"); u->dump(); }
1957 }
1958 }
1959 }
1960 }
1961 return true;
1962 }
1963 #endif
1964
1965 static bool has_mem_phi(Compile* C, Node* region, int alias) {
1966 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) {
1967 Node* use = region->fast_out(i);
1968 if (use->is_Phi() && use->bottom_type() == Type::MEMORY &&
1969 (C->get_alias_index(use->adr_type()) == alias)) {
1970 return true;
1971 }
1972 }
1973 return false;
1974 }
1975
1976 bool ShenandoahWriteBarrierNode::fix_mem_phis_helper(Node* c, Node* mem, Node* mem_ctrl, Node* rep_ctrl, int alias, VectorSet& controls, GrowableArray<Node*>& regions, PhaseIdealLoop* phase) {
1977 const bool trace = false;
1978 Node_List wq;
1979 wq.push(c);
1980
1981 #ifdef ASSERT
1982 if (trace) { tty->print("YYY from"); c->dump(); }
1983 if (trace) { tty->print("YYY with mem"); mem->dump(); }
1984 #endif
1985
1986 while(wq.size() > 0) {
1987 c = wq.pop();
1988
1989 while (!c->is_Region() || c->is_Loop()) {
1990 #ifdef ASSERT
1991 if (trace) { tty->print("YYY"); c->dump(); }
1992 #endif
1993 assert(c->is_CFG(), "node should be control node");
1994 if (c == mem_ctrl || phase->is_dominator(c, rep_ctrl)) {
1995 c = NULL;
1996 break;
1997 } else if (c->is_Loop()) {
1998 c = c->in(LoopNode::EntryControl);
1999 } else {
2000 c = c->in(0);
2001 }
2002 }
2003 if (c == NULL) {
2004 continue;
2005 }
2006
2007 #ifdef ASSERT
2008 if (trace) { tty->print("YYY new region"); c->dump(); }
2009 #endif
2010
2011 bool has_phi = has_mem_phi(phase->C, c, alias);
2012 if (!has_phi) {
2013
2014 Node* m_ctrl = NULL;
2015 Node* m = dom_mem(mem, c, alias, m_ctrl, phase);
2016 if (m == NULL) {
2017 return false;
2018 }
2019
2020 #ifdef ASSERT
2021 if (trace) { tty->print("YYY mem "); m->dump(); }
2022 #endif
2023
2024 if (controls.test(c->_idx)) {
2025 int i;
2026 for (i = 0; i < regions.length() && regions.at(i) != c; i+=2) {
2027 // deliberately empty, rolling over the regions
2028 }
2029 assert(i < regions.length(), "missing region");
2030 Node* prev_m = regions.at(i+1);
2031 if (prev_m == m) {
2032 continue;
2033 }
2034 #ifdef ASSERT
2035 if (trace) { tty->print("YYY prev mem "); prev_m->dump(); }
2036 #endif
2037 Node* prev_m_ctrl = phase->ctrl_or_self(prev_m);
2038 assert(is_dominator(m_ctrl, prev_m_ctrl, m, prev_m, phase) ||
2039 is_dominator(prev_m_ctrl, m_ctrl, prev_m, m, phase), "one should dominate the other");
2040 if (is_dominator(m_ctrl, prev_m_ctrl, m, prev_m, phase)) {
2041 continue;
2042 }
2043 #ifdef ASSERT
2044 if (trace) { tty->print("YYY Fixing "); c->dump(); }
2045 #endif
2046 regions.at_put(i+1, m);
2047 } else {
2048 #ifdef ASSERT
2049 if (trace) { tty->print("YYY Pushing "); c->dump(); }
2050 #endif
2051 regions.push(c);
2052 regions.push(m);
2053 }
2054 } else {
2055 continue;
2056 }
2057
2058 controls.set(c->_idx);
2059
2060 for (uint i = 1; i < c->req(); i++) {
2061 wq.push(c->in(i));
2062 }
2063 }
2064 return true;
2065 }
2066
2067
2068 bool ShenandoahWriteBarrierNode::fix_mem_phis(Node* mem, Node* mem_ctrl, Node* rep_ctrl, int alias, PhaseIdealLoop* phase) {
2069 GrowableArray<Node*> regions;
2070 VectorSet controls(Thread::current()->resource_area());
2071 const bool trace = false;
2072
2073 #ifdef ASSERT
2074 if (trace) { tty->print("YYY mem is "); mem->dump(); }
2075 if (trace) { tty->print("YYY mem ctrl is "); mem_ctrl->dump(); }
2076 if (trace) { tty->print("YYY rep ctrl is "); rep_ctrl->dump(); }
2077 if (trace) { tty->print_cr("YYY alias is %d", alias); }
2078 #endif
2079
2080 // Walk memory edges from mem until we hit a memory point where
2081 // control is known then follow the control up looking for regions
2082 // with no memory Phi for alias
2083 Unique_Node_List wq;
2084 wq.push(mem);
2085
2086 for (uint next = 0; next < wq.size(); next++) {
2087 Node *n = wq.at(next);
2088 #ifdef ASSERT
2089 if (trace) { tty->print("YYY from (2) "); n->dump(); }
2090 #endif
2091 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
2092 Node* u = n->fast_out(i);
2093 #ifdef ASSERT
2094 if (trace) { tty->print("YYY processing "); u->dump(); }
2095 #endif
2096 if (u->is_Phi()) {
2097 assert(u->bottom_type() == Type::MEMORY, "strange memory graph");
2098 if (should_process_phi(u, alias, phase->C)) {
2099 for (uint j = 1; j < u->req(); j++) {
2100 if (u->in(j) == n) {
2101 Node *c = u->in(0)->in(j);
2102 if (!fix_mem_phis_helper(c, n, mem_ctrl, rep_ctrl, alias, controls, regions, phase)) {
2103 return false;
2104 }
2105 }
2106 }
2107 }
2108 #ifdef ASSERT
2109 } else if (u->is_CallStaticJava() && u->as_CallStaticJava()->uncommon_trap_request() != 0) {
2110 if (!fix_mem_phis_helper(u->in(0), n, mem_ctrl, rep_ctrl, alias, controls, regions, phase)) {
2111 return false;
2112 }
2113 #endif
2114 } else if ((u->is_CFG() && u->adr_type() == TypePtr::BOTTOM) || u->Opcode() == Op_Rethrow || u->Opcode() == Op_Return) {
2115 if (!fix_mem_phis_helper(u->in(0), n, mem_ctrl, rep_ctrl, alias, controls, regions, phase)) {
2116 return false;
2117 }
2118 } else if (u->is_MergeMem() && u->as_MergeMem()->memory_at(alias) == n) {
2119 wq.push(u);
2120 } else if (u->Opcode() == Op_ShenandoahWriteBarrier && phase->C->get_alias_index(u->adr_type()) == alias) {
2121 Node* m = u->find_out_with(Op_ShenandoahWBMemProj);
2122 if (m != NULL) {
2123 wq.push(m);
2124 }
2125 }
2126 }
2127 }
2128 #ifdef ASSERT
2129 if (trace) {
2130 tty->print_cr("XXXXXXXXXXXXXXXXXXXX");
2131 for (int i = 0; i < regions.length(); i++) {
2132 Node* r = regions.at(i);
2133 tty->print("%d", i); r->dump();
2134 }
2135 tty->print_cr("XXXXXXXXXXXXXXXXXXXX");
2136 }
2137 #endif
2138
2139 if (regions.length() == 0) {
2140 return true;
2141 }
2142
2143 {
2144 int i = 0;
2145 for (; i < regions.length(); i+=2) {
2146 Node* region = regions.at(i);
2147 bool has_phi = false;
2148 for (DUIterator_Fast jmax, j = region->fast_outs(jmax); j < jmax && !has_phi; j++) {
2149 Node* u = region->fast_out(j);
2150 if (u->is_Phi() && u->bottom_type() == Type::MEMORY &&
2151 (u->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(u->adr_type()) == alias)) {
2152 has_phi = true;
2153 }
2154 }
2155 if (!has_phi) {
2156 break;
2157 }
2158 }
2159 if (i == regions.length()) {
2160 return true;
2161 }
2162 }
2163
2164 // Try to restrict the update to path that post dominates rep_ctrl
2165 int k = 0;
2166 int start = 0;
2167 int end = 0;
2168 do {
2169 start = end;
2170 end = k;
2171 for (int i = end; i < regions.length(); i+=2) {
2172 Node* r = regions.at(i);
2173 int prev = k;
2174 for (uint j = 1; j < r->req() && prev == k; j++) {
2175 if (end == 0) {
2176 if (phase->is_dominator(rep_ctrl, r->in(j))) {
2177 Node* mem = regions.at(i+1);
2178 regions.at_put(i, regions.at(k));
2179 regions.at_put(i+1, regions.at(k+1));
2180 regions.at_put(k, r);
2181 regions.at_put(k+1, mem);
2182 k+=2;
2183 }
2184 } else {
2185 for (int l = start; l < end && prev == k; l+=2) {
2186 Node* r2 = regions.at(l);
2187 if (phase->is_dominator(r2, r->in(j))) {
2188 Node* mem = regions.at(i+1);
2189 regions.at_put(i, regions.at(k));
2190 regions.at_put(i+1, regions.at(k+1));
2191 regions.at_put(k, r);
2192 regions.at_put(k+1, mem);
2193 k+=2;
2194 }
2195 }
2196 }
2197 }
2198 }
2199 #ifdef ASSERT
2200 if (trace) { tty->print_cr("k = %d start = %d end = %d", k, start, end); }
2201 #endif
2202 } while(k != end);
2203
2204 #ifdef ASSERT
2205 if (end != regions.length()) {
2206 if (trace) { tty->print_cr("Compacting %d -> %d", regions.length(), end); }
2207 }
2208 #endif
2209 regions.trunc_to(end);
2210
2211 #ifdef ASSERT
2212 if (trace) {
2213 tty->print_cr("XXXXXXXXXXXXXXXXXXXX");
2214 for (int i = 0; i < regions.length(); i++) {
2215 Node* r = regions.at(i);
2216 tty->print("%d", i); r->dump();
2217 }
2218 tty->print_cr("XXXXXXXXXXXXXXXXXXXX");
2219 }
2220 #endif
2221
2222 // Creating new phis must be done in post order
2223 while (regions.length() > 0) {
2224 int i = 0;
2225 for (; i < regions.length(); i+=2) {
2226 Node* r1 = regions.at(i);
2227 bool is_dom = false;
2228 for (int j = 0; j < regions.length() && !is_dom; j+=2) {
2229 if (i != j) {
2230 Node* r2 = regions.at(j);
2231 for (uint k = 1; k < r2->req() && !is_dom; k++) {
2232 if (phase->is_dominator(r1, r2->in(k))) {
2233 is_dom = true;
2234 }
2235 }
2236 }
2237 }
2238 if (!is_dom) {
2239 break;
2240 }
2241 }
2242 assert(i < regions.length(), "need one");
2243 Node* r = regions.at(i);
2244 Node* m = regions.at(i+1);
2245 regions.delete_at(i+1);
2246 regions.delete_at(i);
2247
2248 if (!suitable_mem(m, NULL, NULL)) {
2249 return false;
2250 }
2251 Node* phi = PhiNode::make(r, m, Type::MEMORY, phase->C->get_adr_type(alias));
2252 #ifdef ASSERT
2253 if (trace) { tty->print("YYY Adding new mem phi "); phi->dump(); }
2254 #endif
2255 phase->register_new_node(phi, r);
2256
2257 fix_memory_uses(m, phi, phi, r, phase->C->get_alias_index(phi->adr_type()), phase);
2258 assert(phi->outcnt() != 0, "new proj should have uses");
2259 if (phi->outcnt() == 0) {
2260 phase->igvn().remove_dead_node(phi);
2261 }
2262 }
2263
2264 return true;
2265 }
2266
2267 Node* ShenandoahBarrierNode::dom_mem(Node* mem, Node*& mem_ctrl, Node* n, Node* rep_ctrl, int alias, PhaseIdealLoop* phase) {
2268 ResourceMark rm;
2269 VectorSet wq(Thread::current()->resource_area());
2270 wq.set(mem->_idx);
2271 mem_ctrl = phase->get_ctrl(mem);
2272 while (!is_dominator(mem_ctrl, rep_ctrl, mem, n, phase)) {
2273 mem = next_mem(mem, alias);
2274 if (wq.test_set(mem->_idx)) {
2275 return NULL; // hit an unexpected loop
2276 }
2277 mem_ctrl = phase->ctrl_or_self(mem);
2278 }
2279 if (mem->is_MergeMem()) {
2280 mem = mem->as_MergeMem()->memory_at(alias);
2281 mem_ctrl = phase->ctrl_or_self(mem);
2282 }
2283 return mem;
2284 }
2285
2286 Node* ShenandoahBarrierNode::dom_mem(Node* mem, Node* ctrl, int alias, Node*& mem_ctrl, PhaseIdealLoop* phase) {
2287 ResourceMark rm;
2288 VectorSet wq(Thread::current()->resource_area());
2289 wq.set(mem->_idx);
2290 mem_ctrl = phase->ctrl_or_self(mem);
2291 while (!phase->is_dominator(mem_ctrl, ctrl) || mem_ctrl == ctrl) {
2292 mem = next_mem(mem, alias);
2293 if (wq.test_set(mem->_idx)) {
2294 return NULL;
2295 }
2296 mem_ctrl = phase->ctrl_or_self(mem);
2297 }
2298 if (mem->is_MergeMem()) {
2299 mem = mem->as_MergeMem()->memory_at(alias);
2300 mem_ctrl = phase->ctrl_or_self(mem);
2301 }
2302 return mem;
2303 }
2304
2305 Node* ShenandoahBarrierNode::try_common(Node *n_ctrl, PhaseIdealLoop* phase) {
2306 if (!phase->C->has_irreducible_loop()) {
2307 // We look for a write barrier whose memory edge dominates n
2308 // Either the replacement write barrier dominates n or we have,
2309 // for instance:
2310 // if ( ) {
2311 // read barrier n
2312 // } else {
2313 // write barrier
2314 // }
2315 // in which case replacing n by the write barrier causes the write
2316 // barrier to move above the if() and the memory Phi that merges
2317 // the memory state for both branches must be updated so both
2318 // inputs become the write barrier's memory projection (and the
2319 // Phi is optimized out) otherwise we risk loosing a memory
2320 // dependency.
2321 // Once we find a replacement write barrier, the code below fixes
2322 // the memory graph in cases like the one above.
2323 Node* val = in(ValueIn);
2324 Node* val_ctrl = phase->get_ctrl(val);
2325 Node* n_proj = find_out_with(Op_ShenandoahWBMemProj);
2326 Node* replacement = NULL;
2327 int alias = phase->C->get_alias_index(adr_type());
2328 Node* rep_ctrl = NULL;
2329 for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax && replacement == NULL; i++) {
2330 Node* u = val->fast_out(i);
2331 if (u != this && u->Opcode() == Op_ShenandoahWriteBarrier) {
2332 Node* u_mem = u->in(Memory);
2333 Node* u_proj = u->find_out_with(Op_ShenandoahWBMemProj);
2334 Node* u_ctrl = phase->get_ctrl(u);
2335 Node* u_mem_ctrl = phase->get_ctrl(u_mem);
2336 IdealLoopTree* n_loop = phase->get_loop(n_ctrl);
2337 IdealLoopTree* u_loop = phase->get_loop(u_ctrl);
2338
2339 Node* ctrl = phase->dom_lca(u_ctrl, n_ctrl);
2340
2341 if (ctrl->is_Proj() &&
2342 ctrl->in(0)->is_Call() &&
2343 ctrl->unique_ctrl_out() != NULL &&
2344 ctrl->unique_ctrl_out()->Opcode() == Op_Catch &&
2345 !phase->is_dominator(val_ctrl, ctrl->in(0)->in(0))) {
2346 continue;
2347 }
2348
2349 if (Opcode() == Op_ShenandoahWriteBarrier && u_proj == NULL && n_proj != NULL) {
2350 continue;
2351 }
2352
2353 IdealLoopTree* loop = phase->get_loop(ctrl);
2354
2355 // We don't want to move a write barrier in a loop
2356 // If the LCA is in a inner loop, try a control out of loop if possible
2357 bool loop_ok = true;
2358 while (!loop->is_member(u_loop) && (Opcode() != Op_ShenandoahWriteBarrier || !loop->is_member(n_loop))) {
2359 ctrl = phase->idom(ctrl);
2360 if (ctrl != val_ctrl && phase->is_dominator(ctrl, val_ctrl)) {
2361 loop_ok = false;
2362 break;
2363 }
2364 loop = phase->get_loop(ctrl);
2365 }
2366
2367 if (loop_ok) {
2368 if (ShenandoahDontIncreaseWBFreq) {
2369 Node* u_iffproj = no_branches(u_ctrl, ctrl, true, phase);
2370 if (Opcode() == Op_ShenandoahWriteBarrier) {
2371 Node* n_iffproj = no_branches(n_ctrl, ctrl, true, phase);
2372 if (u_iffproj == NULL || n_iffproj == NULL) {
2373 replacement = u;
2374 rep_ctrl = ctrl;
2375 } else if (u_iffproj != NodeSentinel && n_iffproj != NodeSentinel && u_iffproj->in(0) == n_iffproj->in(0)) {
2376 replacement = u;
2377 rep_ctrl = ctrl;
2378 }
2379 } else if (u_iffproj == NULL) {
2380 replacement = u;
2381 rep_ctrl = ctrl;
2382 }
2383 } else {
2384 replacement = u;
2385 rep_ctrl = ctrl;
2386 }
2387 }
2388 }
2389 }
2390 if (replacement != NULL) {
2391 if (rep_ctrl->is_Proj() &&
2392 rep_ctrl->in(0)->is_Call() &&
2393 rep_ctrl->unique_ctrl_out() != NULL &&
2394 rep_ctrl->unique_ctrl_out()->Opcode() == Op_Catch) {
2395 rep_ctrl = rep_ctrl->in(0)->in(0);
2396 assert(phase->is_dominator(val_ctrl, rep_ctrl), "bad control");
2397 } else {
2398 LoopNode* c = ShenandoahWriteBarrierNode::try_move_before_pre_loop(rep_ctrl, val_ctrl, phase);
2399 if (c != NULL) {
2400 rep_ctrl = ShenandoahWriteBarrierNode::move_above_predicates(c, val_ctrl, phase);
2401 } else {
2402 while (rep_ctrl->is_IfProj()) {
2403 CallStaticJavaNode* unc = rep_ctrl->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none);
2404 if (unc != NULL) {
2405 int req = unc->uncommon_trap_request();
2406 Deoptimization::DeoptReason trap_reason = Deoptimization::trap_request_reason(req);
2407 if ((trap_reason == Deoptimization::Reason_loop_limit_check ||
2408 trap_reason == Deoptimization::Reason_predicate ||
2409 trap_reason == Deoptimization::Reason_profile_predicate) &&
2410 phase->is_dominator(val_ctrl, rep_ctrl->in(0)->in(0))) {
2411 rep_ctrl = rep_ctrl->in(0)->in(0);
2412 continue;
2413 }
2414 }
2415 break;
2416 }
2417 }
2418 }
2419
2420 Node* mem = replacement->in(Memory);
2421 Node* old_mem = mem;
2422 Node* rep_proj = replacement->find_out_with(Op_ShenandoahWBMemProj);
2423 {
2424 Node* mem_ctrl = NULL;
2425
2426 mem = dom_mem(mem, mem_ctrl, this, rep_ctrl, alias, phase);
2427 if (mem == NULL) {
2428 return NULL;
2429 }
2430
2431 // Add a memory Phi for the slice of the write barrier to any
2432 // region that post dominates rep_ctrl and doesn't have one
2433 // already.
2434 if (rep_proj != NULL && !ShenandoahWriteBarrierNode::fix_mem_phis(mem, mem_ctrl, rep_ctrl, alias, phase)) {
2435 return NULL;
2436 }
2437
2438 assert(!ShenandoahVerifyOptoBarriers || ShenandoahWriteBarrierNode::memory_dominates_all_paths(mem, rep_ctrl, alias, phase), "can't fix the memory graph");
2439 }
2440 assert(phase->igvn().type(mem) == Type::MEMORY, "not memory");
2441
2442 if (rep_proj != NULL) {
2443 Node* old_mem = replacement->in(Memory);
2444 if (!suitable_mem(mem, old_mem, rep_proj)) {
2445 return NULL;
2446 }
2447
2448 if (replacement->in(Memory) != mem) {
2449 // tty->print("XXX setting memory of"); replacement->dump();
2450 // tty->print("XXX to"); mem->dump();
2451 for (DUIterator_Last imin, i = rep_proj->last_outs(imin); i >= imin; ) {
2452 Node* u = rep_proj->last_out(i);
2453 phase->igvn().rehash_node_delayed(u);
2454 int uses_found = u->replace_edge(rep_proj, old_mem);
2455 i -= uses_found;
2456 }
2457 phase->igvn().replace_input_of(replacement, Memory, mem);
2458 }
2459 phase->set_ctrl_and_loop(replacement, rep_ctrl);
2460 phase->igvn().replace_input_of(replacement, Control, rep_ctrl);
2461
2462 ShenandoahWriteBarrierNode::fix_memory_uses(mem, replacement, rep_proj, rep_ctrl, phase->C->get_alias_index(replacement->adr_type()), phase);
2463 assert(rep_proj->outcnt() != 0, "new proj should have uses");
2464 } else {
2465 if (replacement->in(Memory) != mem) {
2466 phase->igvn()._worklist.push(replacement->in(Memory));
2467 phase->igvn().replace_input_of(replacement, Memory, mem);
2468 }
2469 phase->set_ctrl_and_loop(replacement, rep_ctrl);
2470 phase->igvn().replace_input_of(replacement, Control, rep_ctrl);
2471 }
2472 if (Opcode() == Op_ShenandoahWriteBarrier) {
2473 if (n_proj != NULL) {
2474 phase->lazy_replace(n_proj, in(Memory));
2475 }
2476 }
2477 phase->lazy_replace(this, replacement);
2478 if (rep_proj != NULL) {
2479 phase->set_ctrl_and_loop(rep_proj, rep_ctrl);
2480 }
2481 return replacement;
2482 }
2483 }
2484
2485 return NULL;
2486 }
2487
2488 const TypePtr* ShenandoahBarrierNode::fix_addp_type(const TypePtr* res, Node* base) {
2489 if (UseShenandoahGC && ShenandoahBarriersForConst) {
2490 // With barriers on constant oops, if a field being accessed is a
2491 // static field, correct alias analysis requires that we look
2492 // beyond the barriers (that hide the constant) to find the actual
2493 // java class mirror constant.
2494 const TypeInstPtr* ti = res->isa_instptr();
2495 if (ti != NULL &&
2496 ti->const_oop() == NULL &&
2497 ti->klass() == ciEnv::current()->Class_klass() &&
2498 ti->offset() >= (ti->klass()->as_instance_klass()->size_helper() * wordSize)) {
2499 ResourceMark rm;
2500 Unique_Node_List wq;
2501 ciObject* const_oop = NULL;
2502 wq.push(base);
2503 for (uint i = 0; i < wq.size(); i++) {
2504 Node *n = wq.at(i);
2505 if (n->is_ShenandoahBarrier() ||
2506 (n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_ShenandoahReadBarrier)) {
2507 Node* m = n->in(ShenandoahBarrierNode::ValueIn);
2508 if (m != NULL) {
2509 wq.push(m);
2510 }
2511 } else if (n->is_Phi()) {
2512 for (uint j = 1; j < n->req(); j++) {
2513 Node* m = n->in(j);
2514 if (m != NULL) {
2515 wq.push(m);
2516 }
2517 }
2518 } else if (n->is_ConstraintCast() || (n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_CheckCastPP)) {
2519 Node* m = n->in(1);
2520 if (m != NULL) {
2521 wq.push(m);
2522 }
2523 } else {
2524 const TypeInstPtr* tn = n->bottom_type()->isa_instptr();
2525 if (tn != NULL) {
2526 if (tn->const_oop() != NULL) {
2527 if (const_oop == NULL) {
2528 const_oop = tn->const_oop();
2529 } else if (const_oop != tn->const_oop()) {
2530 const_oop = NULL;
2531 break;
2532 }
2533 } else {
2534 if (n->is_Proj()) {
2535 if (n->in(0)->Opcode() == Op_CallLeafNoFP) {
2536 if (n->in(0)->as_Call()->entry_point() != ShenandoahBarrierSetAssembler::shenandoah_wb_C()) {
2537 const_oop = NULL;
2538 break;
2539 }
2540 } else if (n->in(0)->is_MachCallLeaf()) {
2541 if (n->in(0)->as_MachCall()->entry_point() != ShenandoahBarrierSetAssembler::shenandoah_wb_C()) {
2542 const_oop = NULL;
2543 break;
2544 }
2545 }
2546 } else {
2547 fatal("2 different static fields being accessed with a single AddP");
2548 const_oop = NULL;
2549 break;
2550 }
2551 }
2552 } else {
2553 assert(n->bottom_type() == Type::TOP, "not an instance ptr?");
2554 }
2555 }
2556 }
2557 if (const_oop != NULL) {
2558 res = ti->cast_to_const(const_oop);
2559 }
2560 }
2561 }
2562 return res;
2563 }
2564
2565 static void disconnect_barrier_mem(Node* wb, PhaseIterGVN& igvn) {
2566 Node* mem_in = wb->in(ShenandoahBarrierNode::Memory);
2567 Node* proj = wb->find_out_with(Op_ShenandoahWBMemProj);
2568
2569 for (DUIterator_Last imin, i = proj->last_outs(imin); i >= imin; ) {
2570 Node* u = proj->last_out(i);
2571 igvn.rehash_node_delayed(u);
2572 int nb = u->replace_edge(proj, mem_in);
2573 assert(nb > 0, "no replacement?");
2574 i -= nb;
2575 }
2576 }
2577
2578 Node* ShenandoahWriteBarrierNode::move_above_predicates(LoopNode* cl, Node* val_ctrl, PhaseIdealLoop* phase) {
2579 Node* entry = cl->skip_strip_mined()->in(LoopNode::EntryControl);
2580 Node* above_pred = phase->skip_all_loop_predicates(entry);
2581 Node* ctrl = entry;
2582 while (ctrl != above_pred) {
2583 Node* next = ctrl->in(0);
2584 if (!phase->is_dominator(val_ctrl, next)) {
2585 break;
2586 }
2587 ctrl = next;
2588 }
2589 return ctrl;
2590 }
2591
2592 Node* ShenandoahWriteBarrierNode::try_move_before_loop_helper(LoopNode* cl, Node* val_ctrl, Node* mem, PhaseIdealLoop* phase) {
2593 assert(cl->is_Loop(), "bad control");
2594 Node* ctrl = move_above_predicates(cl, val_ctrl, phase);
2595 Node* mem_ctrl = NULL;
2596 int alias = phase->C->get_alias_index(adr_type());
2597 mem = dom_mem(mem, mem_ctrl, this, ctrl, alias, phase);
2598 if (mem == NULL) {
2599 return NULL;
2600 }
2601
2602 Node* old_mem = in(Memory);
2603 Node* proj = find_out_with(Op_ShenandoahWBMemProj);
2604 if (old_mem != mem && !suitable_mem(mem, old_mem, proj)) {
2605 return NULL;
2606 }
2607
2608 assert(!ShenandoahVerifyOptoBarriers || memory_dominates_all_paths(mem, ctrl, alias, phase), "can't fix the memory graph");
2609 phase->set_ctrl_and_loop(this, ctrl);
2610 phase->igvn().replace_input_of(this, Control, ctrl);
2611 if (old_mem != mem) {
2612 if (proj != NULL) {
2613 disconnect_barrier_mem(this, phase->igvn());
2614 fix_memory_uses(mem, this, proj, ctrl, phase->C->get_alias_index(adr_type()), phase);
2615 assert(proj->outcnt() > 0, "disconnected write barrier");
2616 }
2617 phase->igvn().replace_input_of(this, Memory, mem);
2618 }
2619 if (proj != NULL) {
2620 phase->set_ctrl_and_loop(proj, ctrl);
2621 }
2622 return this;
2623 }
2624
2625 LoopNode* ShenandoahWriteBarrierNode::try_move_before_pre_loop(Node* c, Node* val_ctrl, PhaseIdealLoop* phase) {
2626 // A write barrier between a pre and main loop can get in the way of
2627 // vectorization. Move it above the pre loop if possible
2628 CountedLoopNode* cl = NULL;
2629 if (c->is_IfFalse() &&
2630 c->in(0)->is_CountedLoopEnd()) {
2631 cl = c->in(0)->as_CountedLoopEnd()->loopnode();
2632 } else if (c->is_IfProj() &&
2633 c->in(0)->is_If() &&
2634 c->in(0)->in(0)->is_IfFalse() &&
2635 c->in(0)->in(0)->in(0)->is_CountedLoopEnd()) {
2636 cl = c->in(0)->in(0)->in(0)->as_CountedLoopEnd()->loopnode();
2637 }
2638 if (cl != NULL &&
2639 cl->is_pre_loop() &&
2640 val_ctrl != cl &&
2641 phase->is_dominator(val_ctrl, cl)) {
2642 return cl;
2643 }
2644 return NULL;
2645 }
2646
2647 Node* ShenandoahWriteBarrierNode::try_move_before_loop(Node *n_ctrl, PhaseIdealLoop* phase) {
2648 IdealLoopTree *n_loop = phase->get_loop(n_ctrl);
2649 Node* val = in(ValueIn);
2650 Node* val_ctrl = phase->get_ctrl(val);
2651 if (n_loop != phase->ltree_root() && !n_loop->_irreducible) {
2652 IdealLoopTree *val_loop = phase->get_loop(val_ctrl);
2653 Node* mem = in(Memory);
2654 IdealLoopTree *mem_loop = phase->get_loop(phase->get_ctrl(mem));
2655 if (!n_loop->is_member(val_loop) &&
2656 n_loop->is_member(mem_loop)) {
2657 Node* n_loop_head = n_loop->_head;
2658
2659 if (n_loop_head->is_Loop()) {
2660 LoopNode* loop = n_loop_head->as_Loop();
2661 if (n_loop_head->is_CountedLoop() && n_loop_head->as_CountedLoop()->is_main_loop()) {
2662 LoopNode* res = try_move_before_pre_loop(n_loop_head->in(LoopNode::EntryControl), val_ctrl, phase);
2663 if (res != NULL) {
2664 loop = res;
2665 }
2666 }
2667
2668 return try_move_before_loop_helper(loop, val_ctrl, mem, phase);
2669 }
2670 }
2671 }
2672 LoopNode* ctrl = try_move_before_pre_loop(in(0), val_ctrl, phase);
2673 if (ctrl != NULL) {
2674 return try_move_before_loop_helper(ctrl, val_ctrl, in(Memory), phase);
2675 }
2676 return NULL;
2677 }
2678
2679 void ShenandoahReadBarrierNode::try_move(Node *n_ctrl, PhaseIdealLoop* phase) {
2680 Node* mem = in(MemNode::Memory);
2681 int alias = phase->C->get_alias_index(adr_type());
2682 const bool trace = false;
2683
2684 #ifdef ASSERT
2685 if (trace) { tty->print("Trying to move mem of"); dump(); }
2686 #endif
2687
2688 Node* new_mem = mem;
2689
2690 ResourceMark rm;
2691 VectorSet seen(Thread::current()->resource_area());
2692 Node_List phis;
2693
2694 for (;;) {
2695 #ifdef ASSERT
2696 if (trace) { tty->print("Looking for dominator from"); mem->dump(); }
2697 #endif
2698 if (mem->is_Proj() && mem->in(0)->is_Start()) {
2699 if (new_mem != in(MemNode::Memory)) {
2700 #ifdef ASSERT
2701 if (trace) { tty->print("XXX Setting mem to"); new_mem->dump(); tty->print(" for "); dump(); }
2702 #endif
2703 phase->igvn().replace_input_of(this, MemNode::Memory, new_mem);
2704 }
2705 return;
2706 }
2707
2708 Node* candidate = mem;
2709 do {
2710 if (!is_independent(mem)) {
2711 if (trace) { tty->print_cr("Not independent"); }
2712 if (new_mem != in(MemNode::Memory)) {
2713 #ifdef ASSERT
2714 if (trace) { tty->print("XXX Setting mem to"); new_mem->dump(); tty->print(" for "); dump(); }
2715 #endif
2716 phase->igvn().replace_input_of(this, MemNode::Memory, new_mem);
2717 }
2718 return;
2719 }
2720 if (seen.test_set(mem->_idx)) {
2721 if (trace) { tty->print_cr("Already seen"); }
2722 ShouldNotReachHere();
2723 // Strange graph
2724 if (new_mem != in(MemNode::Memory)) {
2725 #ifdef ASSERT
2726 if (trace) { tty->print("XXX Setting mem to"); new_mem->dump(); tty->print(" for "); dump(); }
2727 #endif
2728 phase->igvn().replace_input_of(this, MemNode::Memory, new_mem);
2729 }
2730 return;
2731 }
2732 if (mem->is_Phi()) {
2733 phis.push(mem);
2734 }
2735 mem = next_mem(mem, alias);
2736 if (mem->bottom_type() == Type::MEMORY) {
2737 candidate = mem;
2738 }
2739 assert(is_dominator(phase->ctrl_or_self(mem), n_ctrl, mem, this, phase) == phase->is_dominator(phase->ctrl_or_self(mem), n_ctrl), "strange dominator");
2740 #ifdef ASSERT
2741 if (trace) { tty->print("Next mem is"); mem->dump(); }
2742 #endif
2743 } while (mem->bottom_type() != Type::MEMORY || !phase->is_dominator(phase->ctrl_or_self(mem), n_ctrl));
2744
2745 assert(mem->bottom_type() == Type::MEMORY, "bad mem");
2746
2747 bool not_dom = false;
2748 for (uint i = 0; i < phis.size() && !not_dom; i++) {
2749 Node* nn = phis.at(i);
2750
2751 #ifdef ASSERT
2752 if (trace) { tty->print("Looking from phi"); nn->dump(); }
2753 #endif
2754 assert(nn->is_Phi(), "phis only");
2755 for (uint j = 2; j < nn->req() && !not_dom; j++) {
2756 Node* m = nn->in(j);
2757 #ifdef ASSERT
2758 if (trace) { tty->print("Input %d is", j); m->dump(); }
2759 #endif
2760 while (m != mem && !seen.test_set(m->_idx)) {
2761 if (is_dominator(phase->ctrl_or_self(m), phase->ctrl_or_self(mem), m, mem, phase)) {
2762 not_dom = true;
2763 // Scheduling anomaly
2764 #ifdef ASSERT
2765 if (trace) { tty->print("Giving up"); m->dump(); }
2766 #endif
2767 break;
2768 }
2769 if (!is_independent(m)) {
2770 if (trace) { tty->print_cr("Not independent"); }
2771 if (new_mem != in(MemNode::Memory)) {
2772 #ifdef ASSERT
2773 if (trace) { tty->print("XXX Setting mem to"); new_mem->dump(); tty->print(" for "); dump(); }
2774 #endif
2775 phase->igvn().replace_input_of(this, MemNode::Memory, new_mem);
2776 }
2777 return;
2778 }
2779 if (m->is_Phi()) {
2780 phis.push(m);
2781 }
2782 m = next_mem(m, alias);
2783 #ifdef ASSERT
2784 if (trace) { tty->print("Next mem is"); m->dump(); }
2785 #endif
2786 }
2787 }
2788 }
2789 if (!not_dom) {
2790 new_mem = mem;
2791 phis.clear();
2792 } else {
2793 seen.Clear();
2794 }
2795 }
2796 }
2797
2798 CallStaticJavaNode* ShenandoahWriteBarrierNode::pin_and_expand_null_check(PhaseIterGVN& igvn) {
2799 Node* val = in(ValueIn);
2800
2801 #ifdef ASSERT
2802 const Type* val_t = igvn.type(val);
2803 assert(val_t->meet(TypePtr::NULL_PTR) != val_t, "should be not null");
2804 #endif
2805
2806 if (val->Opcode() == Op_CastPP &&
2807 val->in(0) != NULL &&
2808 val->in(0)->Opcode() == Op_IfTrue &&
2809 val->in(0)->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none) &&
2810 val->in(0)->in(0)->is_If() &&
2811 val->in(0)->in(0)->in(1)->Opcode() == Op_Bool &&
2812 val->in(0)->in(0)->in(1)->as_Bool()->_test._test == BoolTest::ne &&
2813 val->in(0)->in(0)->in(1)->in(1)->Opcode() == Op_CmpP &&
2814 val->in(0)->in(0)->in(1)->in(1)->in(1) == val->in(1) &&
2815 val->in(0)->in(0)->in(1)->in(1)->in(2)->bottom_type() == TypePtr::NULL_PTR) {
2816 assert(val->in(0)->in(0)->in(1)->in(1)->in(1) == val->in(1), "");
2817 CallStaticJavaNode* unc = val->in(0)->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none);
2818 return unc;
2819 }
2820 return NULL;
2821 }
2822
2823 void ShenandoahWriteBarrierNode::pin_and_expand_move_barrier(PhaseIdealLoop* phase, Unique_Node_List& uses) {
2824 Node* unc = pin_and_expand_null_check(phase->igvn());
2825 Node* val = in(ValueIn);
2826
2827 if (unc != NULL) {
2828 Node* ctrl = phase->get_ctrl(this);
2829 Node* unc_ctrl = val->in(0);
2830
2831 // Don't move write barrier in a loop
2832 IdealLoopTree* loop = phase->get_loop(ctrl);
2833 IdealLoopTree* unc_loop = phase->get_loop(unc_ctrl);
2834
2835 if (!unc_loop->is_member(loop)) {
2836 return;
2837 }
2838
2839 Node* branch = no_branches(ctrl, unc_ctrl, false, phase);
2840 assert(branch == NULL || branch == NodeSentinel, "was not looking for a branch");
2841 if (branch == NodeSentinel) {
2842 return;
2843 }
2844
2845
2846 RegionNode* r = new RegionNode(3);
2847 IfNode* iff = unc_ctrl->in(0)->as_If();
2848
2849 Node* ctrl_use = unc_ctrl->unique_ctrl_out();
2850 Node* c = unc_ctrl;
2851 Node* new_cast = clone_null_check(c, val, unc_ctrl, r, 1, phase);
2852
2853 phase->igvn().rehash_node_delayed(ctrl_use);
2854 int nb = ctrl_use->replace_edge(unc_ctrl, c);
2855 assert(nb == 1, "no update?");
2856 if (phase->idom(ctrl_use) == unc_ctrl) {
2857 phase->set_idom(ctrl_use, c, phase->dom_depth(ctrl_use));
2858 }
2859
2860 IfNode* new_iff = new_cast->in(0)->in(0)->as_If();
2861 fix_null_check(iff, unc, unc_ctrl, r, uses, phase);
2862 Node* iff_proj = iff->proj_out(0);
2863 r->init_req(2, iff_proj);
2864
2865 Node* new_bol = new_iff->in(1)->clone();
2866 Node* new_cmp = new_bol->in(1)->clone();
2867 assert(new_cmp->Opcode() == Op_CmpP, "broken");
2868 assert(new_cmp->in(1) == val->in(1), "broken");
2869 new_bol->set_req(1, new_cmp);
2870 new_cmp->set_req(1, this);
2871 phase->register_new_node(new_bol, new_iff->in(0));
2872 phase->register_new_node(new_cmp, new_iff->in(0));
2873 phase->igvn().replace_input_of(new_iff, 1, new_bol);
2874 phase->igvn().replace_input_of(new_cast, 1, this);
2875
2876 for (DUIterator_Fast imax, i = this->fast_outs(imax); i < imax; i++) {
2877 Node* u = this->fast_out(i);
2878 if (u == new_cast || u->Opcode() == Op_ShenandoahWBMemProj || u == new_cmp) {
2879 continue;
2880 }
2881 phase->igvn().rehash_node_delayed(u);
2882 int nb = u->replace_edge(this, new_cast);
2883 assert(nb > 0, "no update?");
2884 --i; imax -= nb;
2885 }
2886
2887 for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) {
2888 Node* u = val->fast_out(i);
2889 if (u == this) {
2890 continue;
2891 }
2892 phase->igvn().rehash_node_delayed(u);
2893 int nb = u->replace_edge(val, new_cast);
2894 assert(nb > 0, "no update?");
2895 --i; imax -= nb;
2896 }
2897
2898 uses.clear();
2899 uses.push(new_cast);
2900 for (uint next = 0; next < uses.size(); next++) {
2901 Node *n = uses.at(next);
2902 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
2903 Node* u = n->fast_out(i);
2904 if (phase->has_ctrl(u) && phase->get_ctrl(u) == unc_ctrl) {
2905 phase->set_ctrl(u, c);
2906 if (u->in(0) == unc_ctrl) {
2907 phase->igvn().replace_input_of(u, 0, c);
2908 }
2909 uses.push(u);
2910 }
2911 }
2912 }
2913
2914 Node* new_ctrl = unc_ctrl;
2915
2916 Node* mem = in(Memory);
2917 Node* old_mem = mem;
2918
2919 Node* mem_ctrl = NULL;
2920 int alias = phase->C->get_alias_index(adr_type());
2921 mem = dom_mem(mem, mem_ctrl, this, new_ctrl, alias, phase);
2922 if (mem == NULL) {
2923 return;
2924 }
2925
2926 Node* proj = find_out_with(Op_ShenandoahWBMemProj);
2927 if (!fix_mem_phis(mem, mem_ctrl, new_ctrl, alias, phase)) {
2928 return;
2929 }
2930
2931 assert(mem == old_mem || memory_dominates_all_paths(mem, new_ctrl, alias, phase), "can't fix the memory graph");
2932 phase->set_ctrl_and_loop(this, new_ctrl);
2933 if (in(Control) != NULL) {
2934 phase->igvn().replace_input_of(this, Control, new_ctrl);
2935 }
2936 disconnect_barrier_mem(this, phase->igvn());
2937 fix_memory_uses(mem, this, proj, new_ctrl, phase->C->get_alias_index(adr_type()), phase);
2938 assert(proj->outcnt() > 0, "disconnected write barrier");
2939 phase->igvn().replace_input_of(this, Memory, mem);
2940 phase->set_ctrl_and_loop(proj, new_ctrl);
2941 }
2942 }
2943
2944 void ShenandoahWriteBarrierNode::pin_and_expand_helper(PhaseIdealLoop* phase) {
2945 Node* val = in(ValueIn);
2946 CallStaticJavaNode* unc = pin_and_expand_null_check(phase->igvn());
2947 Node* rep = this;
2948 Node* ctrl = phase->get_ctrl(this);
2949 if (unc != NULL && val->in(0) == ctrl) {
2950 Node* unc_ctrl = val->in(0);
2951 IfNode* other_iff = unc_ctrl->unique_ctrl_out()->as_If();
2952 ProjNode* other_unc_ctrl = other_iff->proj_out(1);
2953 Node* cast = other_unc_ctrl->find_out_with(Op_CastPP);
2954 assert(cast != NULL, "missing cast");
2955 assert(cast->in(1) == this, "bad cast");
2956 assert(other_unc_ctrl->is_uncommon_trap_if_pattern(Deoptimization::Reason_none) == unc, "broken");
2957 rep = cast;
2958 }
2959
2960 // Replace all uses of barrier's input that are dominated by ctrl
2961 // with the value returned by the barrier: no need to keep both
2962 // live.
2963 for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) {
2964 Node* u = val->fast_out(i);
2965 if (u != this) {
2966 if (u->is_Phi()) {
2967 int nb = 0;
2968 for (uint j = 1; j < u->req(); j++) {
2969 if (u->in(j) == val) {
2970 Node* c = u->in(0)->in(j);
2971 if (phase->is_dominator(ctrl, c)) {
2972 phase->igvn().replace_input_of(u, j, rep);
2973 nb++;
2974 }
2975 }
2976 }
2977 if (nb > 0) {
2978 imax -= nb;
2979 --i;
2980 }
2981 } else {
2982 Node* c = phase->ctrl_or_self(u);
2983 if (is_dominator(ctrl, c, this, u, phase)) {
2984 phase->igvn().rehash_node_delayed(u);
2985 int nb = u->replace_edge(val, rep);
2986 assert(nb > 0, "no update?");
2987 --i, imax -= nb;
2988 }
2989 }
2990 }
2991 }
2992 }
2993
2994 Node* ShenandoahWriteBarrierNode::pick_phi(Node* phi1, Node* phi2, Node_Stack& phis, VectorSet& visited, PhaseIdealLoop* phase) {
2995 assert(phis.size() == 0, "stack needs to be empty");
2996 uint i = 1;
2997 int phi_dominates = -1;
2998 for (;;) {
2999 assert(phi1->req() == phi2->req(), "strange pair of phis");
3000 assert(phis.size() % 2 == 0, "");
3001 Node* in1 = phi1->in(i);
3002 Node* in2 = phi2->in(i);
3003
3004 if (in1->is_MergeMem()) {
3005 in1 = in1->as_MergeMem()->base_memory();
3006 }
3007 if (in2->is_MergeMem()) {
3008 in2 = in2->as_MergeMem()->base_memory();
3009 }
3010
3011 if (in1 == in2) {
3012 //continue
3013 } else if (in1->is_Phi() && in2->is_Phi() && in1->in(0) == in2->in(0)) {
3014 assert(!visited.test_set(in1->_idx), "no loop");
3015 assert(!visited.test_set(in2->_idx), "no loop");
3016 phis.push(phi1, i+1);
3017 phis.push(phi2, i+1);
3018 phi1 = in1;
3019 phi2 = in2;
3020 i = 1;
3021 } else {
3022 Node* in1_c = phase->get_ctrl(in1);
3023 Node* in2_c = phase->get_ctrl(in2);
3024 if (is_dominator(in1_c, in2_c, in1, in2, phase)) {
3025 assert(!is_dominator(in2_c, in1_c, in2, in1, phase), "one has to dominate the other");
3026 assert(phi_dominates == -1 || phi_dominates == 1, "all inputs must dominate");
3027 phi_dominates = 1;
3028 } else {
3029 assert(is_dominator(in2_c, in1_c, in2, in1, phase), "one must dominate the other");
3030 assert(!is_dominator(in1_c, in2_c, in1, in2, phase), "one has to dominate the other");
3031 assert(phi_dominates == -1 || phi_dominates == 2, "all inputs must dominate");
3032 phi_dominates = 2;
3033 }
3034 }
3035 i++;
3036
3037 while (i >= phi1->req() && phis.size() > 0) {
3038 i = phis.index();
3039 phi2 = phis.node();
3040 phis.pop();
3041 phi1 = phis.node();
3042 phis.pop();
3043 }
3044
3045 if (i >= phi1->req() && phis.size() == 0) {
3046 Node* phi = NULL;
3047 if (phi_dominates == 1) {
3048 return phi2;
3049 } else if (phi_dominates == 2) {
3050 return phi1;
3051 } else {
3052 return phi1;
3053 }
3054 }
3055 }
3056 return NULL;
3057 }
3058
3059 bool ShenandoahWriteBarrierNode::mem_is_valid(Node* m, Node* c, PhaseIdealLoop* phase) {
3060 return m != NULL && get_ctrl(m, phase) == c;
3061 }
3062
3063 Node* ShenandoahWriteBarrierNode::find_raw_mem(Node* ctrl, Node* n, const Node_List& memory_nodes, PhaseIdealLoop* phase) {
3064 assert(n == NULL || phase->ctrl_or_self(n) == ctrl, "");
3065 Node* raw_mem = memory_nodes[ctrl->_idx];
3066 Node* c = ctrl;
3067 while (!mem_is_valid(raw_mem, c, phase) &&
3068 (!c->is_CatchProj() || raw_mem == NULL || c->in(0)->in(0)->in(0) != get_ctrl(raw_mem, phase))) {
3069 c = phase->idom(c);
3070 raw_mem = memory_nodes[c->_idx];
3071 }
3072 if (n != NULL && mem_is_valid(raw_mem, c, phase)) {
3073 while (!is_dominator_same_ctrl(c, raw_mem, n, phase) && phase->ctrl_or_self(raw_mem) == ctrl) {
3074 raw_mem = next_mem(raw_mem, Compile::AliasIdxRaw);
3075 }
3076 if (raw_mem->is_MergeMem()) {
3077 raw_mem = raw_mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
3078 }
3079 if (!mem_is_valid(raw_mem, c, phase)) {
3080 do {
3081 c = phase->idom(c);
3082 raw_mem = memory_nodes[c->_idx];
3083 } while (!mem_is_valid(raw_mem, c, phase) &&
3084 (!c->is_CatchProj() || raw_mem == NULL || c->in(0)->in(0)->in(0) != get_ctrl(raw_mem, phase)));
3085 }
3086 }
3087 assert(raw_mem->bottom_type() == Type::MEMORY, "");
3088 return raw_mem;
3089 }
3090
3091 Node* ShenandoahWriteBarrierNode::find_bottom_mem(Node* ctrl, PhaseIdealLoop* phase) {
3092 Node* mem = NULL;
3093 Node* c = ctrl;
3094 do {
3095 if (c->is_Region()) {
3096 Node* phi_bottom = NULL;
3097 for (DUIterator_Fast imax, i = c->fast_outs(imax); i < imax; i++) {
3098 Node* u = c->fast_out(i);
3099 if (u->is_Phi() && u->bottom_type() == Type::MEMORY) {
3100 if (u->adr_type() == TypePtr::BOTTOM) {
3101 if (phi_bottom != NULL) {
3102 phi_bottom = NodeSentinel;
3103 } else {
3104 phi_bottom = u;
3105 }
3106 }
3107 }
3108 }
3109 if (phi_bottom != NULL) {
3110 if (phi_bottom != NodeSentinel) {
3111 mem = phi_bottom;
3112 } else {
3113 Node* phi = NULL;
3114 ResourceMark rm;
3115 Node_Stack phis(0);
3116 VectorSet visited(Thread::current()->resource_area());
3117 for (DUIterator_Fast imax, i = c->fast_outs(imax); i < imax; i++) {
3118 Node* u = c->fast_out(i);
3119 if (u->is_Phi() && u->bottom_type() == Type::MEMORY && u->adr_type() == TypePtr::BOTTOM) {
3120 if (phi == NULL) {
3121 phi = u;
3122 } else {
3123 phi = pick_phi(phi, u, phis, visited, phase);
3124 }
3125 }
3126 }
3127 mem = phi;
3128 }
3129 }
3130 } else {
3131 if (c->is_Call() && c->as_Call()->adr_type() != NULL) {
3132 CallProjections projs;
3133 c->as_Call()->extract_projections(&projs, true, false);
3134 if (projs.fallthrough_memproj != NULL) {
3135 if (projs.fallthrough_memproj->adr_type() == TypePtr::BOTTOM) {
3136 if (projs.catchall_memproj == NULL) {
3137 mem = projs.fallthrough_memproj;
3138 } else {
3139 if (phase->is_dominator(projs.fallthrough_catchproj, ctrl)) {
3140 mem = projs.fallthrough_memproj;
3141 } else {
3142 assert(phase->is_dominator(projs.catchall_catchproj, ctrl), "one proj must dominate barrier");
3143 mem = projs.catchall_memproj;
3144 }
3145 }
3146 }
3147 } else {
3148 Node* proj = c->as_Call()->proj_out(TypeFunc::Memory);
3149 if (proj != NULL &&
3150 proj->adr_type() == TypePtr::BOTTOM) {
3151 mem = proj;
3152 }
3153 }
3154 } else {
3155 for (DUIterator_Fast imax, i = c->fast_outs(imax); i < imax; i++) {
3156 Node* u = c->fast_out(i);
3157 if (u->is_Proj() &&
3158 u->bottom_type() == Type::MEMORY &&
3159 u->adr_type() == TypePtr::BOTTOM) {
3160 assert(c->is_SafePoint() || c->is_MemBar() || c->is_Start(), "");
3161 assert(mem == NULL, "only one proj");
3162 mem = u;
3163 }
3164 }
3165 assert(!c->is_Call() || c->as_Call()->adr_type() != NULL || mem == NULL, "no mem projection expected");
3166 }
3167 }
3168 c = phase->idom(c);
3169 } while (mem == NULL);
3170 return mem;
3171 }
3172
3173 void ShenandoahWriteBarrierNode::follow_barrier_uses(Node* n, Node* ctrl, Unique_Node_List& uses, PhaseIdealLoop* phase) {
3174 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
3175 Node* u = n->fast_out(i);
3176 if (!u->is_CFG() && phase->get_ctrl(u) == ctrl && (!u->is_Phi() || !u->in(0)->is_Loop() || u->in(LoopNode::LoopBackControl) != n)) {
3177 uses.push(u);
3178 }
3179 }
3180 }
3181
3182 Node* ShenandoahWriteBarrierNode::get_ctrl(Node* n, PhaseIdealLoop* phase) {
3183 Node* c = phase->get_ctrl(n);
3184 if (n->is_Proj() && n->in(0)->is_Call()) {
3185 assert(c == n->in(0), "");
3186 CallNode* call = c->as_Call();
3187 CallProjections projs;
3188 call->extract_projections(&projs, true, false);
3189 if (projs.catchall_memproj != NULL) {
3190 if (projs.fallthrough_memproj == n) {
3191 c = projs.fallthrough_catchproj;
3192 } else {
3193 assert(projs.catchall_memproj == n, "");
3194 c = projs.catchall_catchproj;
3195 }
3196 }
3197 }
3198 return c;
3199 }
3200
3201 Node* ShenandoahWriteBarrierNode::ctrl_or_self(Node* n, PhaseIdealLoop* phase) {
3202 if (phase->has_ctrl(n))
3203 return get_ctrl(n, phase);
3204 else {
3205 assert (n->is_CFG(), "must be a CFG node");
3206 return n;
3207 }
3208 }
3209
3210 #ifdef ASSERT
3211 static bool has_never_branch(Node* root) {
3212 for (uint i = 1; i < root->req(); i++) {
3213 Node* in = root->in(i);
3214 if (in != NULL && in->Opcode() == Op_Halt && in->in(0)->is_Proj() && in->in(0)->in(0)->Opcode() == Op_NeverBranch) {
3215 return true;
3216 }
3217 }
3218 return false;
3219 }
3220 #endif
3221
3222 void ShenandoahWriteBarrierNode::collect_memory_nodes(int alias, Node_List& memory_nodes, PhaseIdealLoop* phase) {
3223 Node_Stack stack(0);
3224 VectorSet visited(Thread::current()->resource_area());
3225 Node_List regions;
3226
3227 // Walk the raw memory graph and create a mapping from CFG node to
3228 // memory node. Exclude phis for now.
3229 stack.push(phase->C->root(), 1);
3230 do {
3231 Node* n = stack.node();
3232 int opc = n->Opcode();
3233 uint i = stack.index();
3234 if (i < n->req()) {
3235 Node* mem = NULL;
3236 if (opc == Op_Root) {
3237 Node* in = n->in(i);
3238 int in_opc = in->Opcode();
3239 if (in_opc == Op_Return || in_opc == Op_Rethrow) {
3240 mem = in->in(TypeFunc::Memory);
3241 } else if (in_opc == Op_Halt) {
3242 if (!in->in(0)->is_Region()) {
3243 Node* proj = in->in(0);
3244 assert(proj->is_Proj(), "");
3245 Node* in = proj->in(0);
3246 assert(in->is_CallStaticJava() || in->Opcode() == Op_NeverBranch || in->Opcode() == Op_Catch || proj->is_IfProj(), "");
3247 if (in->is_CallStaticJava()) {
3248 mem = in->in(TypeFunc::Memory);
3249 } else if (in->Opcode() == Op_Catch) {
3250 Node* call = in->in(0)->in(0);
3251 assert(call->is_Call(), "");
3252 mem = call->in(TypeFunc::Memory);
3253 }
3254 }
3255 } else {
3256 #ifdef ASSERT
3257 n->dump();
3258 in->dump();
3259 #endif
3260 ShouldNotReachHere();
3261 }
3262 } else {
3263 assert(n->is_Phi() && n->bottom_type() == Type::MEMORY, "");
3264 assert(n->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(n->adr_type()) == alias, "");
3265 mem = n->in(i);
3266 }
3267 i++;
3268 stack.set_index(i);
3269 if (mem == NULL) {
3270 continue;
3271 }
3272 for (;;) {
3273 if (visited.test_set(mem->_idx) || mem->is_Start()) {
3274 break;
3275 }
3276 if (mem->is_Phi()) {
3277 stack.push(mem, 2);
3278 mem = mem->in(1);
3279 } else if (mem->is_Proj()) {
3280 stack.push(mem, mem->req());
3281 mem = mem->in(0);
3282 } else if (mem->is_SafePoint() || mem->is_MemBar()) {
3283 mem = mem->in(TypeFunc::Memory);
3284 } else if (mem->is_MergeMem()) {
3285 mem = mem->as_MergeMem()->memory_at(alias);
3286 } else if (mem->is_Store() || mem->is_LoadStore() || mem->is_ClearArray()) {
3287 stack.push(mem, mem->req());
3288 mem = mem->in(MemNode::Memory);
3289 } else {
3290 #ifdef ASSERT
3291 mem->dump();
3292 #endif
3293 ShouldNotReachHere();
3294 }
3295 }
3296 } else {
3297 if (n->is_Phi()) {
3298 // Nothing
3299 } else if (!n->is_Root()) {
3300 Node* c = get_ctrl(n, phase);
3301 memory_nodes.map(c->_idx, n);
3302 }
3303 stack.pop();
3304 }
3305 } while(stack.is_nonempty());
3306
3307 // Iterate over CFG nodes in rpo and propagate memory state to
3308 // compute memory state at regions, creating new phis if needed.
3309 Node_List rpo_list;
3310 visited.Clear();
3311 phase->rpo(phase->C->root(), stack, visited, rpo_list);
3312 Node* root = rpo_list.pop();
3313 assert(root == phase->C->root(), "");
3314
3315 const bool trace = false;
3316 #ifdef ASSERT
3317 if (trace) {
3318 for (int i = rpo_list.size() - 1; i >= 0; i--) {
3319 Node* c = rpo_list.at(i);
3320 if (memory_nodes[c->_idx] != NULL) {
3321 tty->print("X %d", c->_idx); memory_nodes[c->_idx]->dump();
3322 }
3323 }
3324 }
3325 #endif
3326 uint last = phase->C->unique();
3327
3328 #ifdef ASSERT
3329 uint8_t max_depth = 0;
3330 for (LoopTreeIterator iter(phase->ltree_root()); !iter.done(); iter.next()) {
3331 IdealLoopTree* lpt = iter.current();
3332 max_depth = MAX2(max_depth, lpt->_nest);
3333 }
3334 #endif
3335
3336 bool progress = true;
3337 int iteration = 0;
3338 Node_List dead_phis;
3339 while (progress) {
3340 progress = false;
3341 iteration++;
3342 assert(iteration <= 2+max_depth || phase->C->has_irreducible_loop(), "");
3343 if (trace) { tty->print_cr("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"); }
3344 IdealLoopTree* last_updated_ilt = NULL;
3345 for (int i = rpo_list.size() - 1; i >= 0; i--) {
3346 Node* c = rpo_list.at(i);
3347
3348 Node* prev_mem = memory_nodes[c->_idx];
3349 if (c->is_Region()) {
3350 Node* prev_region = regions[c->_idx];
3351 Node* unique = NULL;
3352 for (uint j = 1; j < c->req() && unique != NodeSentinel; j++) {
3353 Node* m = memory_nodes[c->in(j)->_idx];
3354 assert(m != NULL || (c->is_Loop() && j == LoopNode::LoopBackControl && iteration == 1) || phase->C->has_irreducible_loop() || has_never_branch(phase->C->root()), "expect memory state");
3355 if (m != NULL) {
3356 if (m == prev_region && ((c->is_Loop() && j == LoopNode::LoopBackControl) || (prev_region->is_Phi() && prev_region->in(0) == c))) {
3357 assert(c->is_Loop() && j == LoopNode::LoopBackControl || phase->C->has_irreducible_loop(), "");
3358 // continue
3359 } else if (unique == NULL) {
3360 unique = m;
3361 } else if (m == unique) {
3362 // continue
3363 } else {
3364 unique = NodeSentinel;
3365 }
3366 }
3367 }
3368 assert(unique != NULL, "empty phi???");
3369 if (unique != NodeSentinel) {
3370 if (prev_region != NULL && prev_region->is_Phi() && prev_region->in(0) == c) {
3371 dead_phis.push(prev_region);
3372 }
3373 regions.map(c->_idx, unique);
3374 } else {
3375 Node* phi = NULL;
3376 if (prev_region != NULL && prev_region->is_Phi() && prev_region->in(0) == c && prev_region->_idx >= last) {
3377 phi = prev_region;
3378 for (uint k = 1; k < c->req(); k++) {
3379 Node* m = memory_nodes[c->in(k)->_idx];
3380 assert(m != NULL, "expect memory state");
3381 phi->set_req(k, m);
3382 }
3383 } else {
3384 for (DUIterator_Fast jmax, j = c->fast_outs(jmax); j < jmax && phi == NULL; j++) {
3385 Node* u = c->fast_out(j);
3386 if (u->is_Phi() && u->bottom_type() == Type::MEMORY &&
3387 (u->adr_type() == TypePtr::BOTTOM || phase->C->get_alias_index(u->adr_type()) == alias)) {
3388 phi = u;
3389 for (uint k = 1; k < c->req() && phi != NULL; k++) {
3390 Node* m = memory_nodes[c->in(k)->_idx];
3391 assert(m != NULL, "expect memory state");
3392 if (u->in(k) != m) {
3393 phi = NULL;
3394 }
3395 }
3396 }
3397 }
3398 if (phi == NULL) {
3399 phi = new PhiNode(c, Type::MEMORY, phase->C->get_adr_type(alias));
3400 for (uint k = 1; k < c->req(); k++) {
3401 Node* m = memory_nodes[c->in(k)->_idx];
3402 assert(m != NULL, "expect memory state");
3403 phi->init_req(k, m);
3404 }
3405 }
3406 }
3407 assert(phi != NULL, "");
3408 regions.map(c->_idx, phi);
3409 }
3410 Node* current_region = regions[c->_idx];
3411 if (current_region != prev_region) {
3412 progress = true;
3413 if (prev_region == prev_mem) {
3414 memory_nodes.map(c->_idx, current_region);
3415 }
3416 }
3417 } else if (prev_mem == NULL || prev_mem->is_Phi() || ctrl_or_self(prev_mem, phase) != c) {
3418 Node* m = memory_nodes[phase->idom(c)->_idx];
3419 assert(m != NULL, "expect memory state");
3420 if (m != prev_mem) {
3421 memory_nodes.map(c->_idx, m);
3422 progress = true;
3423 }
3424 }
3425 #ifdef ASSERT
3426 if (trace) { tty->print("X %d", c->_idx); memory_nodes[c->_idx]->dump(); }
3427 #endif
3428 }
3429 }
3430
3431 // Replace existing phi with computed memory state for that region
3432 // if different (could be a new phi or a dominating memory node if
3433 // that phi was found to be useless).
3434 while (dead_phis.size() > 0) {
3435 Node* n = dead_phis.pop();
3436 n->replace_by(phase->C->top());
3437 n->destruct();
3438 }
3439 for (int i = rpo_list.size() - 1; i >= 0; i--) {
3440 Node* c = rpo_list.at(i);
3441 if (c->is_Region()) {
3442 Node* n = regions[c->_idx];
3443 if (n->is_Phi() && n->_idx >= last && n->in(0) == c) {
3444 phase->register_new_node(n, c);
3445 }
3446 }
3447 }
3448 for (int i = rpo_list.size() - 1; i >= 0; i--) {
3449 Node* c = rpo_list.at(i);
3450 if (c->is_Region()) {
3451 Node* n = regions[c->_idx];
3452 for (DUIterator_Fast imax, i = c->fast_outs(imax); i < imax; i++) {
3453 Node* u = c->fast_out(i);
3454 if (u->is_Phi() && u->bottom_type() == Type::MEMORY &&
3455 u != n) {
3456 if (u->adr_type() == TypePtr::BOTTOM) {
3457 fix_memory_uses(u, n, n, c, alias, phase);
3458 } else if (phase->C->get_alias_index(u->adr_type()) == alias) {
3459 phase->lazy_replace(u, n);
3460 --i; --imax;
3461 }
3462 }
3463 }
3464 }
3465 }
3466 }
3467
3468 void ShenandoahWriteBarrierNode::fix_raw_mem(Node* ctrl, Node* region, Node* raw_mem, Node* raw_mem_for_ctrl, Node* raw_mem_phi,
3469 Node_List& memory_nodes, Unique_Node_List& uses, PhaseIdealLoop* phase) {
3470 const bool trace = false;
3471 DEBUG_ONLY(if (trace) { tty->print("ZZZ control is"); ctrl->dump(); });
3472 DEBUG_ONLY(if (trace) { tty->print("ZZZ mem is"); raw_mem->dump(); });
3473 GrowableArray<Node*> phis;
3474 if (raw_mem_for_ctrl != raw_mem) {
3475 Node* old = raw_mem_for_ctrl;
3476 Node* prev = NULL;
3477 while (old != raw_mem) {
3478 assert(old->is_Store() || old->is_LoadStore() || old->is_ClearArray(), "");
3479 prev = old;
3480 old = old->in(MemNode::Memory);
3481 }
3482 assert(prev != NULL, "");
3483 memory_nodes.map(ctrl->_idx, raw_mem);
3484 memory_nodes.map(region->_idx, raw_mem_for_ctrl);
3485 phase->igvn().replace_input_of(prev, MemNode::Memory, raw_mem_phi);
3486 } else {
3487 memory_nodes.map(region->_idx, raw_mem_phi);
3488 uses.clear();
3489 uses.push(region);
3490 for(uint next = 0; next < uses.size(); next++ ) {
3491 Node *n = uses.at(next);
3492 assert(n->is_CFG(), "");
3493 DEBUG_ONLY(if (trace) { tty->print("ZZZ ctrl"); n->dump(); });
3494 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
3495 Node* u = n->fast_out(i);
3496 if (!u->is_Root() && u->is_CFG() && u != n) {
3497 Node* m = memory_nodes[u->_idx];
3498 if (u->is_Region() && !has_mem_phi(phase->C, u, Compile::AliasIdxRaw) &&
3499 u->unique_ctrl_out()->Opcode() != Op_Halt) {
3500 DEBUG_ONLY(if (trace) { tty->print("ZZZ region"); u->dump(); });
3501 DEBUG_ONLY(if (trace && m != NULL) { tty->print("ZZZ mem"); m->dump(); });
3502
3503 if (!mem_is_valid(m, u, phase) || !m->is_Phi()) {
3504 bool push = true;
3505 bool create_phi = true;
3506 if (phase->is_dominator(region, u)) {
3507 create_phi = false;
3508 } else if (!phase->C->has_irreducible_loop()) {
3509 IdealLoopTree* loop = phase->get_loop(ctrl);
3510 bool do_check = true;
3511 IdealLoopTree* l = loop;
3512 create_phi = false;
3513 while (l != phase->ltree_root()) {
3514 if (phase->is_dominator(l->_head, u) && phase->is_dominator(phase->idom(u), l->_head)) {
3515 create_phi = true;
3516 do_check = false;
3517 break;
3518 }
3519 l = l->_parent;
3520 }
3521
3522 if (do_check) {
3523 assert(!create_phi, "");
3524 IdealLoopTree* u_loop = phase->get_loop(u);
3525 if (u_loop != phase->ltree_root() && u_loop->is_member(loop)) {
3526 Node* c = ctrl;
3527 while (!phase->is_dominator(c, u_loop->tail())) {
3528 c = phase->idom(c);
3529 }
3530 if (!phase->is_dominator(c, u)) {
3531 do_check = false;
3532 }
3533 }
3534 }
3535
3536 if (do_check && phase->is_dominator(phase->idom(u), region)) {
3537 create_phi = true;
3538 }
3539 }
3540 if (create_phi) {
3541 Node* phi = new PhiNode(u, Type::MEMORY, TypeRawPtr::BOTTOM);
3542 phase->register_new_node(phi, u);
3543 phis.push(phi);
3544 DEBUG_ONLY(if (trace) { tty->print("ZZZ new phi"); phi->dump(); });
3545 if (!mem_is_valid(m, u, phase)) {
3546 DEBUG_ONLY(if (trace) { tty->print("ZZZ setting mem"); phi->dump(); });
3547 memory_nodes.map(u->_idx, phi);
3548 } else {
3549 DEBUG_ONLY(if (trace) { tty->print("ZZZ NOT setting mem"); m->dump(); });
3550 for (;;) {
3551 assert(m->is_Mem() || m->is_LoadStore() || m->is_Proj() /*|| m->is_MergeMem()*/, "");
3552 Node* next = NULL;
3553 if (m->is_Proj()) {
3554 next = m->in(0);
3555 } else {
3556 next = m->in(MemNode::Memory);
3557 }
3558 if (phase->get_ctrl(next) != u) {
3559 break;
3560 }
3561 if (next->is_MergeMem()) {
3562 assert(phase->get_ctrl(next->as_MergeMem()->memory_at(Compile::AliasIdxRaw)) != u, "");
3563 break;
3564 }
3565 if (next->is_Phi()) {
3566 assert(next->adr_type() == TypePtr::BOTTOM && next->in(0) == u, "");
3567 break;
3568 }
3569 m = next;
3570 }
3571
3572 DEBUG_ONLY(if (trace) { tty->print("ZZZ setting to phi"); m->dump(); });
3573 assert(m->is_Mem() || m->is_LoadStore(), "");
3574 phase->igvn().replace_input_of(m, MemNode::Memory, phi);
3575 push = false;
3576 }
3577 } else {
3578 DEBUG_ONLY(if (trace) { tty->print("ZZZ skipping region"); u->dump(); });
3579 }
3580 if (push) {
3581 uses.push(u);
3582 }
3583 }
3584 } else if (!mem_is_valid(m, u, phase) &&
3585 !(u->Opcode() == Op_CProj && u->in(0)->Opcode() == Op_NeverBranch && u->as_Proj()->_con == 1)) {
3586 uses.push(u);
3587 }
3588 }
3589 }
3590 }
3591 for (int i = 0; i < phis.length(); i++) {
3592 Node* n = phis.at(i);
3593 Node* r = n->in(0);
3594 DEBUG_ONLY(if (trace) { tty->print("ZZZ fixing new phi"); n->dump(); });
3595 for (uint j = 1; j < n->req(); j++) {
3596 Node* m = find_raw_mem(r->in(j), NULL, memory_nodes, phase);
3597 phase->igvn().replace_input_of(n, j, m);
3598 DEBUG_ONLY(if (trace) { tty->print("ZZZ fixing new phi: %d", j); m->dump(); });
3599 }
3600 }
3601 }
3602 uint last = phase->C->unique();
3603 MergeMemNode* mm = NULL;
3604 int alias = Compile::AliasIdxRaw;
3605 DEBUG_ONLY(if (trace) { tty->print("ZZZ raw mem is"); raw_mem->dump(); });
3606 for (DUIterator i = raw_mem->outs(); raw_mem->has_out(i); i++) {
3607 Node* u = raw_mem->out(i);
3608 if (u->_idx < last) {
3609 if (u->is_Mem()) {
3610 if (phase->C->get_alias_index(u->adr_type()) == alias) {
3611 Node* m = find_raw_mem(phase->get_ctrl(u), u, memory_nodes, phase);
3612 if (m != raw_mem) {
3613 DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of use"); u->dump(); });
3614 phase->igvn().replace_input_of(u, MemNode::Memory, m);
3615 --i;
3616 }
3617 }
3618 } else if (u->is_MergeMem()) {
3619 MergeMemNode* u_mm = u->as_MergeMem();
3620 if (u_mm->memory_at(alias) == raw_mem) {
3621 MergeMemNode* newmm = NULL;
3622 for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) {
3623 Node* uu = u->fast_out(j);
3624 assert(!uu->is_MergeMem(), "chain of MergeMems?");
3625 if (uu->is_Phi()) {
3626 assert(uu->adr_type() == TypePtr::BOTTOM, "");
3627 Node* region = uu->in(0);
3628 int nb = 0;
3629 for (uint k = 1; k < uu->req(); k++) {
3630 if (uu->in(k) == u) {
3631 Node* m = find_raw_mem(region->in(k), NULL, memory_nodes, phase);
3632 if (m != raw_mem) {
3633 DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of phi %d", k); uu->dump(); });
3634 if (newmm == NULL || 1) {
3635 newmm = clone_merge_mem(u, raw_mem, alias, m, phase->ctrl_or_self(m), i, phase);
3636 }
3637 if (newmm != u) {
3638 phase->igvn().replace_input_of(uu, k, newmm);
3639 nb++;
3640 --jmax;
3641 }
3642 }
3643 }
3644 }
3645 if (nb > 0) {
3646 --j;
3647 }
3648 } else {
3649 Node* m = find_raw_mem(phase->ctrl_or_self(uu), uu, memory_nodes, phase);
3650 if (m != raw_mem) {
3651 DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of use"); uu->dump(); });
3652 if (newmm == NULL || 1) {
3653 newmm = clone_merge_mem(u, raw_mem, alias, m, phase->ctrl_or_self(m), i, phase);
3654 }
3655 if (newmm != u) {
3656 phase->igvn().replace_input_of(uu, uu->find_edge(u), newmm);
3657 --j, --jmax;
3658 }
3659 }
3660 }
3661 }
3662 }
3663 } else if (u->is_Phi()) {
3664 assert(u->bottom_type() == Type::MEMORY, "what else?");
3665 if (u->adr_type() == TypeRawPtr::BOTTOM || u->adr_type() == TypePtr::BOTTOM) {
3666 Node* region = u->in(0);
3667 bool replaced = false;
3668 for (uint j = 1; j < u->req(); j++) {
3669 if (u->in(j) == raw_mem) {
3670 Node* m = find_raw_mem(region->in(j), NULL, memory_nodes, phase);
3671 Node* nnew = m;
3672 if (m != raw_mem) {
3673 if (u->adr_type() == TypePtr::BOTTOM) {
3674 if (mm == NULL || 1) {
3675 mm = allocate_merge_mem(raw_mem, alias, m, phase->ctrl_or_self(m), phase);
3676 }
3677 nnew = mm;
3678 }
3679 DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of phi %d", j); u->dump(); });
3680 phase->igvn().replace_input_of(u, j, nnew);
3681 replaced = true;
3682 }
3683 }
3684 }
3685 if (replaced) {
3686 --i;
3687 }
3688 }
3689 } else if ((u->adr_type() == TypePtr::BOTTOM && u->Opcode() != Op_StrInflatedCopy) ||
3690 u->adr_type() == NULL) {
3691 assert(u->adr_type() != NULL ||
3692 u->Opcode() == Op_Rethrow ||
3693 u->Opcode() == Op_Return ||
3694 u->Opcode() == Op_SafePoint ||
3695 (u->is_CallStaticJava() && u->as_CallStaticJava()->uncommon_trap_request() != 0) ||
3696 (u->is_CallStaticJava() && u->as_CallStaticJava()->_entry_point == OptoRuntime::rethrow_stub()) ||
3697 u->Opcode() == Op_CallLeaf, "");
3698 Node* m = find_raw_mem(phase->ctrl_or_self(u), u, memory_nodes, phase);
3699 if (m != raw_mem) {
3700 if (mm == NULL || 1) {
3701 mm = allocate_merge_mem(raw_mem, alias, m, phase->get_ctrl(m), phase);
3702 }
3703 phase->igvn().replace_input_of(u, u->find_edge(raw_mem), mm);
3704 --i;
3705 }
3706 } else if (phase->C->get_alias_index(u->adr_type()) == alias) {
3707 Node* m = find_raw_mem(phase->ctrl_or_self(u), u, memory_nodes, phase);
3708 if (m != raw_mem) {
3709 DEBUG_ONLY(if (trace) { tty->print("ZZZ setting memory of use"); u->dump(); });
3710 phase->igvn().replace_input_of(u, u->find_edge(raw_mem), m);
3711 --i;
3712 }
3713 }
3714 }
3715 }
3716 #ifdef ASSERT
3717 assert(raw_mem_phi->outcnt() > 0, "");
3718 for (int i = 0; i < phis.length(); i++) {
3719 Node* n = phis.at(i);
3720 assert(n->outcnt() > 0, "new phi must have uses now");
3721 }
3722 #endif
3723 }
3724
3725 void ShenandoahWriteBarrierNode::test_heap_stable(Node* ctrl, Node* raw_mem, Node*& gc_state, Node*& heap_stable,
3726 Node*& heap_not_stable, PhaseIdealLoop* phase) {
3727 IdealLoopTree *loop = phase->get_loop(ctrl);
3728 Node* thread = new ThreadLocalNode();
3729 phase->register_new_node(thread, ctrl);
3730 Node* offset = phase->igvn().MakeConX(in_bytes(ShenandoahThreadLocalData::gc_state_offset()));
3731 phase->set_ctrl(offset, phase->C->root());
3732 Node* gc_state_addr = new AddPNode(phase->C->top(), thread, offset);
3733 phase->register_new_node(gc_state_addr, ctrl);
3734 uint gc_state_idx = Compile::AliasIdxRaw;
3735 const TypePtr* gc_state_adr_type = NULL; // debug-mode-only argument
3736 debug_only(gc_state_adr_type = phase->C->get_adr_type(gc_state_idx));
3737
3738 gc_state = new LoadBNode(ctrl, raw_mem, gc_state_addr, gc_state_adr_type, TypeInt::BYTE, MemNode::unordered);
3739 phase->register_new_node(gc_state, ctrl);
3740
3741 Node* heap_stable_cmp = new CmpINode(gc_state, phase->igvn().zerocon(T_INT));
3742 phase->register_new_node(heap_stable_cmp, ctrl);
3743 Node* heap_stable_test = new BoolNode(heap_stable_cmp, BoolTest::ne);
3744 phase->register_new_node(heap_stable_test, ctrl);
3745 IfNode* heap_stable_iff = new IfNode(ctrl, heap_stable_test, PROB_UNLIKELY(0.999), COUNT_UNKNOWN);
3746 phase->register_control(heap_stable_iff, loop, ctrl);
3747
3748 heap_stable = new IfFalseNode(heap_stable_iff);
3749 phase->register_control(heap_stable, loop, heap_stable_iff);
3750 heap_not_stable = new IfTrueNode(heap_stable_iff);
3751 phase->register_control(heap_not_stable, loop, heap_stable_iff);
3752
3753 assert(is_heap_stable_test(heap_stable_iff), "Should match the shape");
3754 }
3755
3756
3757 void ShenandoahWriteBarrierNode::test_evacuation_in_progress(Node* ctrl, int alias, Node*& raw_mem, Node*& wb_mem,
3758 Node*& evac_in_progress, Node*& evac_not_in_progress, Node*& heap_stable,
3759 PhaseIdealLoop* phase) {
3760 IdealLoopTree *loop = phase->get_loop(ctrl);
3761 Node* heap_not_stable = NULL;
3762 Node* unused_gc_state = NULL;
3763
3764 test_heap_stable(ctrl, raw_mem, unused_gc_state, heap_stable, heap_not_stable, phase);
3765
3766 ctrl = heap_not_stable;
3767
3768 Node* thread = new ThreadLocalNode();
3769 phase->register_new_node(thread, ctrl);
3770 Node* offset = phase->igvn().MakeConX(in_bytes(ShenandoahThreadLocalData::gc_state_offset()));
3771 phase->set_ctrl(offset, phase->C->root());
3772 Node* gc_state_addr = new AddPNode(phase->C->top(), thread, offset);
3773 phase->register_new_node(gc_state_addr, ctrl);
3774 uint gc_state_idx = Compile::AliasIdxRaw;
3775 const TypePtr* gc_state_adr_type = NULL; // debug-mode-only argument
3776 debug_only(gc_state_adr_type = phase->C->get_adr_type(gc_state_idx));
3777
3778 Node* gc_state = new LoadBNode(ctrl, raw_mem, gc_state_addr, gc_state_adr_type, TypeInt::BYTE, MemNode::unordered);
3779 phase->register_new_node(gc_state, ctrl);
3780
3781 Node* evacuation_in_progress = new AndINode(gc_state, phase->igvn().intcon(ShenandoahHeap::EVACUATION | ShenandoahHeap::TRAVERSAL));
3782 phase->register_new_node(evacuation_in_progress, ctrl);
3783 Node* evacuation_in_progress_cmp = new CmpINode(evacuation_in_progress, phase->igvn().zerocon(T_INT));
3784 phase->register_new_node(evacuation_in_progress_cmp, ctrl);
3785 Node* evacuation_in_progress_test = new BoolNode(evacuation_in_progress_cmp, BoolTest::ne);
3786 phase->register_new_node(evacuation_in_progress_test, ctrl);
3787 IfNode* evacuation_iff = new IfNode(ctrl, evacuation_in_progress_test, PROB_UNLIKELY(0.999), COUNT_UNKNOWN);
3788 phase->register_control(evacuation_iff, loop, ctrl);
3789
3790 assert(is_evacuation_in_progress_test(evacuation_iff), "Should match the shape");
3791 assert(is_gc_state_load(gc_state), "Should match the shape");
3792
3793 evac_not_in_progress = new IfFalseNode(evacuation_iff);
3794 phase->register_control(evac_not_in_progress, loop, evacuation_iff);
3795 evac_in_progress = new IfTrueNode(evacuation_iff);
3796 phase->register_control(evac_in_progress, loop, evacuation_iff);
3797 }
3798
3799 Node* ShenandoahWriteBarrierNode::clone_null_check(Node*& c, Node* val, Node* unc_ctrl,
3800 Node* unc_region, uint input, PhaseIdealLoop* phase) {
3801 IdealLoopTree *loop = phase->get_loop(c);
3802 Node* iff = unc_ctrl->in(0);
3803 assert(iff->is_If(), "broken");
3804 Node* new_iff = iff->clone();
3805 new_iff->set_req(0, c);
3806 phase->register_control(new_iff, loop, c);
3807 Node* iffalse = new IfFalseNode(new_iff->as_If());
3808 phase->register_control(iffalse, loop, new_iff);
3809 Node* iftrue = new IfTrueNode(new_iff->as_If());
3810 phase->register_control(iftrue, loop, new_iff);
3811 c = iftrue;
3812 const Type *t = phase->igvn().type(val);
3813 assert(val->Opcode() == Op_CastPP, "expect cast to non null here");
3814 Node* uncasted_val = val->in(1);
3815 val = new CastPPNode(uncasted_val, t);
3816 val->init_req(0, c);
3817 phase->register_new_node(val, c);
3818 unc_region->init_req(input, iffalse);
3819 return val;
3820 }
3821
3822 void ShenandoahWriteBarrierNode::fix_null_check(Node* dom, Node* unc, Node* unc_ctrl, Node* unc_region,
3823 Unique_Node_List& uses, PhaseIdealLoop* phase) {
3824 IfNode* iff = unc_ctrl->in(0)->as_If();
3825 Node* proj = iff->proj_out(0);
3826 assert(proj != unc_ctrl, "bad projection");
3827 Node* use = proj->unique_ctrl_out();
3828
3829 assert(use == unc || use->is_Region(), "what else?");
3830
3831 uses.clear();
3832 if (use == unc) {
3833 phase->set_idom(use, unc_region, phase->dom_depth(use));
3834 for (uint i = 1; i < unc->req(); i++) {
3835 Node* n = unc->in(i);
3836 if (phase->has_ctrl(n) && phase->get_ctrl(n) == proj) {
3837 uses.push(n);
3838 }
3839 }
3840 } else {
3841 assert(use->is_Region(), "what else?");
3842 uint idx = 1;
3843 for (; use->in(idx) != proj; idx++);
3844 for (DUIterator_Fast imax, i = use->fast_outs(imax); i < imax; i++) {
3845 Node* u = use->fast_out(i);
3846 if (u->is_Phi() && phase->get_ctrl(u->in(idx)) == proj) {
3847 uses.push(u->in(idx));
3848 }
3849 }
3850 }
3851 for(uint next = 0; next < uses.size(); next++ ) {
3852 Node *n = uses.at(next);
3853 assert(phase->get_ctrl(n) == proj, "bad control");
3854 phase->set_ctrl_and_loop(n, unc_region);
3855 if (n->in(0) == proj) {
3856 phase->igvn().replace_input_of(n, 0, unc_region);
3857 }
3858 for (uint i = 0; i < n->req(); i++) {
3859 Node* m = n->in(i);
3860 if (m != NULL && phase->has_ctrl(m) && phase->get_ctrl(m) == proj) {
3861 uses.push(m);
3862 }
3863 }
3864 }
3865
3866 phase->igvn().rehash_node_delayed(use);
3867 int nb = use->replace_edge(proj, unc_region);
3868 assert(nb == 1, "only use expected");
3869 phase->register_control(unc_region, phase->ltree_root(), dom);
3870 }
3871
3872 void ShenandoahWriteBarrierNode::evacuation_not_in_progress_null_check(Node*& c, Node*& val, Node* unc_ctrl, Node*& unc_region, PhaseIdealLoop* phase) {
3873 if (unc_ctrl != NULL) {
3874 // Clone the null check in this branch to allow implicit null check
3875 unc_region = new RegionNode(3);
3876 val = clone_null_check(c, val, unc_ctrl, unc_region, 1, phase);
3877 }
3878 }
3879
3880 void ShenandoahWriteBarrierNode::evacuation_not_in_progress(Node* c, Node* val, Node* unc_ctrl, Node* raw_mem, Node* wb_mem, Node* region,
3881 Node* val_phi, Node* mem_phi, Node* raw_mem_phi, Node*& unc_region, PhaseIdealLoop* phase) {
3882 evacuation_not_in_progress_null_check(c, val, unc_ctrl, unc_region, phase);
3883 region->init_req(1, c);
3884 if (ShenandoahWriteBarrierRB) {
3885 Node* rbfalse = new ShenandoahReadBarrierNode(c, wb_mem, val);
3886 phase->register_new_node(rbfalse, c);
3887 val_phi->init_req(1, rbfalse);
3888 } else {
3889 val_phi->init_req(1, val);
3890 }
3891 mem_phi->init_req(1, wb_mem);
3892 raw_mem_phi->init_req(1, raw_mem);
3893 }
3894
3895 void ShenandoahWriteBarrierNode::heap_stable(Node* c, Node* val, Node* unc_ctrl, Node* raw_mem, Node* wb_mem, Node* region,
3896 Node* val_phi, Node* mem_phi, Node* raw_mem_phi, Node* unc_region, PhaseIdealLoop* phase) {
3897 region->init_req(1, c);
3898 if (unc_ctrl != NULL) {
3899 val = val->in(1);
3900 }
3901 val_phi->init_req(1, val);
3902 mem_phi->init_req(1, wb_mem);
3903 raw_mem_phi->init_req(1, raw_mem);
3904 }
3905
3906 void ShenandoahWriteBarrierNode::evacuation_in_progress_null_check(Node*& c, Node*& val, Node* evacuation_iff, Node* unc, Node* unc_ctrl,
3907 Node* unc_region, Unique_Node_List& uses, PhaseIdealLoop* phase) {
3908 if (unc != NULL) {
3909 // Clone the null check in this branch to allow implicit null check
3910 val = clone_null_check(c, val, unc_ctrl, unc_region, 2, phase);
3911
3912 fix_null_check(evacuation_iff, unc, unc_ctrl, unc_region, uses, phase);
3913
3914 IfNode* iff = unc_ctrl->in(0)->as_If();
3915 phase->igvn().replace_input_of(iff, 1, phase->igvn().intcon(1));
3916 }
3917 }
3918
3919 void ShenandoahWriteBarrierNode::in_cset_fast_test(Node*& c, Node* rbtrue, Node* raw_mem, Node* wb_mem, Node* region, Node* val_phi, Node* mem_phi,
3920 Node* raw_mem_phi, PhaseIdealLoop* phase) {
3921 if (ShenandoahWriteBarrierCsetTestInIR) {
3922 IdealLoopTree *loop = phase->get_loop(c);
3923 Node* raw_rbtrue = new CastP2XNode(c, rbtrue);
3924 phase->register_new_node(raw_rbtrue, c);
3925 Node* cset_offset = new URShiftXNode(raw_rbtrue, phase->igvn().intcon(ShenandoahHeapRegion::region_size_bytes_shift_jint()));
3926 phase->register_new_node(cset_offset, c);
3927 Node* in_cset_fast_test_base_addr = phase->igvn().makecon(TypeRawPtr::make(ShenandoahHeap::in_cset_fast_test_addr()));
3928 phase->set_ctrl(in_cset_fast_test_base_addr, phase->C->root());
3929 Node* in_cset_fast_test_adr = new AddPNode(phase->C->top(), in_cset_fast_test_base_addr, cset_offset);
3930 phase->register_new_node(in_cset_fast_test_adr, c);
3931 uint in_cset_fast_test_idx = Compile::AliasIdxRaw;
3932 const TypePtr* in_cset_fast_test_adr_type = NULL; // debug-mode-only argument
3933 debug_only(in_cset_fast_test_adr_type = phase->C->get_adr_type(in_cset_fast_test_idx));
3934 Node* in_cset_fast_test_load = new LoadUBNode(c, raw_mem, in_cset_fast_test_adr, in_cset_fast_test_adr_type, TypeInt::BOOL, MemNode::unordered);
3935 phase->register_new_node(in_cset_fast_test_load, c);
3936 Node* in_cset_fast_test_cmp = new CmpINode(in_cset_fast_test_load, phase->igvn().zerocon(T_INT));
3937 phase->register_new_node(in_cset_fast_test_cmp, c);
3938 Node* in_cset_fast_test_test = new BoolNode(in_cset_fast_test_cmp, BoolTest::ne);
3939 phase->register_new_node(in_cset_fast_test_test, c);
3940 IfNode* in_cset_fast_test_iff = new IfNode(c, in_cset_fast_test_test, PROB_UNLIKELY(0.999), COUNT_UNKNOWN);
3941 phase->register_control(in_cset_fast_test_iff, loop, c);
3942
3943 Node* in_cset_fast_test_success = new IfFalseNode(in_cset_fast_test_iff);
3944 phase->register_control(in_cset_fast_test_success, loop, in_cset_fast_test_iff);
3945
3946 region->init_req(3, in_cset_fast_test_success);
3947 val_phi->init_req(3, rbtrue);
3948 mem_phi->init_req(3, wb_mem);
3949 raw_mem_phi->init_req(3, raw_mem);
3950
3951 Node* in_cset_fast_test_failure = new IfTrueNode(in_cset_fast_test_iff);
3952 phase->register_control(in_cset_fast_test_failure, loop, in_cset_fast_test_iff);
3953
3954 c = in_cset_fast_test_failure;
3955 }
3956 }
3957
3958 void ShenandoahWriteBarrierNode::evacuation_in_progress(Node* c, Node* val, Node* evacuation_iff, Node* unc, Node* unc_ctrl,
3959 Node* raw_mem, Node* wb_mem, Node* region, Node* val_phi, Node* mem_phi,
3960 Node* raw_mem_phi, Node* unc_region, int alias, Unique_Node_List& uses,
3961 PhaseIdealLoop* phase) {
3962 evacuation_in_progress_null_check(c, val, evacuation_iff, unc, unc_ctrl, unc_region, uses, phase);
3963
3964 IdealLoopTree *loop = phase->get_loop(c);
3965 Node* rbtrue = new ShenandoahReadBarrierNode(c, wb_mem, val);
3966 phase->register_new_node(rbtrue, c);
3967
3968 Node* in_cset_fast_test_failure = NULL;
3969 in_cset_fast_test(c, rbtrue, raw_mem, wb_mem, region, val_phi, mem_phi, raw_mem_phi, phase);
3970
3971 // The slow path stub consumes and produces raw memory in addition
3972 // to the existing memory edges
3973 Node* base = find_bottom_mem(c, phase);
3974
3975 MergeMemNode* mm = MergeMemNode::make(base);
3976 mm->set_memory_at(alias, wb_mem);
3977 mm->set_memory_at(Compile::AliasIdxRaw, raw_mem);
3978 phase->register_new_node(mm, c);
3979
3980 Node* call = new CallLeafNoFPNode(ShenandoahBarrierSetC2::shenandoah_write_barrier_Type(), ShenandoahBarrierSetAssembler::shenandoah_wb_C(), "shenandoah_write_barrier", TypeRawPtr::BOTTOM);
3981 call->init_req(TypeFunc::Control, c);
3982 call->init_req(TypeFunc::I_O, phase->C->top());
3983 call->init_req(TypeFunc::Memory, mm);
3984 call->init_req(TypeFunc::FramePtr, phase->C->top());
3985 call->init_req(TypeFunc::ReturnAdr, phase->C->top());
3986 call->init_req(TypeFunc::Parms, rbtrue);
3987 phase->register_control(call, loop, c);
3988 Node* ctrl_proj = new ProjNode(call, TypeFunc::Control);
3989 phase->register_control(ctrl_proj, loop, call);
3990 Node* mem_proj = new ProjNode(call, TypeFunc::Memory);
3991 phase->register_new_node(mem_proj, call);
3992 Node* res_proj = new ProjNode(call, TypeFunc::Parms);
3993 phase->register_new_node(res_proj, call);
3994 Node* res = new CheckCastPPNode(ctrl_proj, res_proj, phase->igvn().type(val)->is_oopptr()->cast_to_nonconst());
3995 phase->register_new_node(res, ctrl_proj);
3996 region->init_req(2, ctrl_proj);
3997 val_phi->init_req(2, res);
3998 mem_phi->init_req(2, mem_proj);
3999 raw_mem_phi->init_req(2, mem_proj);
4000 }
4001
4002 void ShenandoahWriteBarrierNode::pin_and_expand(PhaseIdealLoop* phase) {
4003 const bool trace = false;
4004
4005 // Collect raw memory state at CFG points in the entire graph and
4006 // record it in memory_nodes. Optimize the raw memory graph in the
4007 // process. Optimizing the memory graph also makes the memory graph
4008 // simpler.
4009 Node_List memory_nodes;
4010 collect_memory_nodes(Compile::AliasIdxRaw, memory_nodes, phase);
4011
4012 // Let's try to common write barriers again
4013 for (;;) {
4014 bool progress = false;
4015 for (int i = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count(); i > 0; i--) {
4016 ShenandoahBarrierNode* wb = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barrier(i-1);
4017 Node* ctrl = phase->get_ctrl(wb);
4018 if (wb->try_common(ctrl, phase) != NULL) {
4019 progress = true;
4020 }
4021 }
4022 if (!progress) {
4023 break;
4024 }
4025 }
4026
4027 Unique_Node_List uses;
4028 for (int i = 0; i < ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count(); i++) {
4029 ShenandoahWriteBarrierNode* wb = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barrier(i);
4030 Node* ctrl = phase->get_ctrl(wb);
4031
4032 Node* val = wb->in(ValueIn);
4033 if (ctrl->is_Proj() && ctrl->in(0)->is_CallJava()) {
4034 assert(is_dominator(phase->get_ctrl(val), ctrl->in(0)->in(0), val, ctrl->in(0), phase), "can't move");
4035 phase->set_ctrl(wb, ctrl->in(0)->in(0));
4036 } else if (ctrl->is_CallRuntime()) {
4037 assert(is_dominator(phase->get_ctrl(val), ctrl->in(0), val, ctrl, phase), "can't move");
4038 phase->set_ctrl(wb, ctrl->in(0));
4039 }
4040
4041 assert(wb->Opcode() == Op_ShenandoahWriteBarrier, "only for write barriers");
4042 // Look for a null check that dominates this barrier and move the
4043 // barrier right after the null check to enable implicit null
4044 // checks
4045 wb->pin_and_expand_move_barrier(phase, uses);
4046
4047 wb->pin_and_expand_helper(phase);
4048 }
4049
4050 Unique_Node_List uses_to_ignore;
4051 for (int i = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count(); i > 0; i--) {
4052 int cnt = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count();
4053 ShenandoahWriteBarrierNode* wb = ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barrier(i-1);
4054
4055 uint last = phase->C->unique();
4056 Node* ctrl = phase->get_ctrl(wb);
4057
4058 Node* raw_mem = find_raw_mem(ctrl, wb, memory_nodes, phase);
4059 Node* init_raw_mem = raw_mem;
4060 Node* raw_mem_for_ctrl = find_raw_mem(ctrl, NULL, memory_nodes, phase);
4061 int alias = phase->C->get_alias_index(wb->adr_type());
4062 Node* wb_mem = wb->in(Memory);
4063 Node* init_wb_mem = wb_mem;
4064
4065 Node* val = wb->in(ValueIn);
4066 Node* wbproj = wb->find_out_with(Op_ShenandoahWBMemProj);
4067 IdealLoopTree *loop = phase->get_loop(ctrl);
4068
4069 assert(val->Opcode() != Op_ShenandoahWriteBarrier || phase->C->has_irreducible_loop(), "No chain of write barriers");
4070
4071 CallStaticJavaNode* unc = wb->pin_and_expand_null_check(phase->igvn());
4072 Node* unc_ctrl = NULL;
4073 if (unc != NULL) {
4074 if (val->in(0) != ctrl) {
4075 unc = NULL;
4076 } else {
4077 unc_ctrl = val->in(0);
4078 }
4079 }
4080
4081 Node* uncasted_val = val;
4082 if (unc != NULL) {
4083 uncasted_val = val->in(1);
4084 }
4085
4086 Node* evac_in_progress = NULL;
4087 Node* evac_not_in_progress = NULL;
4088 Node* heap_stable_ctrl = NULL;
4089 test_evacuation_in_progress(ctrl, alias, raw_mem, wb_mem, evac_in_progress, evac_not_in_progress, heap_stable_ctrl, phase);
4090 IfNode* evacuation_iff = evac_in_progress->in(0)->as_If();
4091 IfNode* heap_stable_iff = heap_stable_ctrl->in(0)->as_If();
4092
4093 Node* evacuation_region = new RegionNode(4);
4094 Node* evacuation_val_phi = new PhiNode(evacuation_region, uncasted_val->bottom_type()->is_oopptr()->cast_to_nonconst());
4095 Node* evacuation_mem_phi = PhiNode::make(evacuation_region, wb_mem, Type::MEMORY, phase->C->alias_type(wb->adr_type())->adr_type());
4096 Node* evacuation_raw_mem_phi = PhiNode::make(evacuation_region, raw_mem, Type::MEMORY, TypeRawPtr::BOTTOM);
4097 Node* region = new RegionNode(3);
4098 Node* val_phi = new PhiNode(region, uncasted_val->bottom_type()->is_oopptr()->cast_to_nonconst());
4099 Node* mem_phi = PhiNode::make(region, wb_mem, Type::MEMORY, phase->C->alias_type(wb->adr_type())->adr_type());
4100 Node* raw_mem_phi = PhiNode::make(region, raw_mem, Type::MEMORY, TypeRawPtr::BOTTOM);
4101
4102 Node* unc_region = NULL;
4103 evacuation_not_in_progress(evac_not_in_progress, val, unc_ctrl, raw_mem, wb_mem,
4104 evacuation_region, evacuation_val_phi, evacuation_mem_phi, evacuation_raw_mem_phi, unc_region,
4105 phase);
4106
4107 heap_stable(heap_stable_ctrl, val, unc_ctrl, init_raw_mem, init_wb_mem, region, val_phi, mem_phi, raw_mem_phi,
4108 unc_region, phase);
4109
4110 evacuation_in_progress(evac_in_progress, val, evacuation_iff, unc, unc_ctrl,
4111 raw_mem, wb_mem, evacuation_region, evacuation_val_phi, evacuation_mem_phi, evacuation_raw_mem_phi,
4112 unc_region, alias, uses,
4113 phase);
4114 region->init_req(2, evacuation_region);
4115 val_phi->init_req(2, evacuation_val_phi);
4116 mem_phi->init_req(2, evacuation_mem_phi);
4117 raw_mem_phi->init_req(2, evacuation_raw_mem_phi);
4118 phase->register_control(evacuation_region, loop, evacuation_iff);
4119 phase->register_new_node(evacuation_val_phi, evacuation_region);
4120 phase->register_new_node(evacuation_mem_phi, evacuation_region);
4121 phase->register_new_node(evacuation_raw_mem_phi, evacuation_region);
4122
4123 phase->register_control(region, loop, heap_stable_iff);
4124
4125 Node* out_val = val_phi;
4126 phase->register_new_node(val_phi, region);
4127 phase->register_new_node(mem_phi, region);
4128 phase->register_new_node(raw_mem_phi, region);
4129
4130 // Update the control of all nodes that should be after the
4131 // barrier control flow
4132 uses.clear();
4133 // Every node that is control dependent on the barrier's input
4134 // control will be after the expanded barrier. The raw memory (if
4135 // its memory is control dependent on the barrier's input control)
4136 // must stay above the barrier.
4137 uses_to_ignore.clear();
4138 if (phase->has_ctrl(init_raw_mem) && phase->get_ctrl(init_raw_mem) == ctrl && !init_raw_mem->is_Phi()) {
4139 uses_to_ignore.push(init_raw_mem);
4140 }
4141 for (uint next = 0; next < uses_to_ignore.size(); next++) {
4142 Node *n = uses_to_ignore.at(next);
4143 for (uint i = 0; i < n->req(); i++) {
4144 Node* in = n->in(i);
4145 if (in != NULL && phase->has_ctrl(in) && phase->get_ctrl(in) == ctrl) {
4146 uses_to_ignore.push(in);
4147 }
4148 }
4149 }
4150 for (DUIterator_Fast imax, i = ctrl->fast_outs(imax); i < imax; i++) {
4151 Node* u = ctrl->fast_out(i);
4152 if (u->_idx < last &&
4153 u != wb &&
4154 !uses_to_ignore.member(u) &&
4155 (u->in(0) != ctrl || (!u->is_Region() && !u->is_Phi())) &&
4156 (ctrl->Opcode() != Op_CatchProj || u->Opcode() != Op_CreateEx)) {
4157 Node* old_c = phase->ctrl_or_self(u);
4158 Node* c = old_c;
4159 if (c != ctrl ||
4160 is_dominator_same_ctrl(old_c, wb, u, phase) ||
4161 u->is_g1_marking_load()) {
4162 phase->igvn().rehash_node_delayed(u);
4163 int nb = u->replace_edge(ctrl, region);
4164 if (u->is_CFG()) {
4165 if (phase->idom(u) == ctrl) {
4166 phase->set_idom(u, region, phase->dom_depth(region));
4167 }
4168 } else if (phase->get_ctrl(u) == ctrl) {
4169 assert(u != init_raw_mem, "should leave input raw mem above the barrier");
4170 uses.push(u);
4171 }
4172 assert(nb == 1, "more than 1 ctrl input?");
4173 --i, imax -= nb;
4174 }
4175 }
4176 }
4177
4178 if (wbproj != NULL) {
4179 phase->igvn().replace_input_of(wbproj, 0, phase->C->top());
4180 phase->lazy_replace(wbproj, mem_phi);
4181 }
4182 if (unc != NULL) {
4183 for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) {
4184 Node* u = val->fast_out(i);
4185 Node* c = phase->ctrl_or_self(u);
4186 if (u != wb && (c != ctrl || is_dominator_same_ctrl(c, wb, u, phase))) {
4187 phase->igvn().rehash_node_delayed(u);
4188 int nb = u->replace_edge(val, out_val);
4189 --i, imax -= nb;
4190 }
4191 }
4192 if (val->outcnt() == 0) {
4193 phase->lazy_update(val, out_val);
4194 phase->igvn()._worklist.push(val);
4195 }
4196 }
4197 phase->lazy_replace(wb, out_val);
4198
4199 follow_barrier_uses(mem_phi, ctrl, uses, phase);
4200 follow_barrier_uses(out_val, ctrl, uses, phase);
4201
4202 for(uint next = 0; next < uses.size(); next++ ) {
4203 Node *n = uses.at(next);
4204 assert(phase->get_ctrl(n) == ctrl, "bad control");
4205 assert(n != init_raw_mem, "should leave input raw mem above the barrier");
4206 phase->set_ctrl(n, region);
4207 follow_barrier_uses(n, ctrl, uses, phase);
4208 }
4209
4210 // The slow path call produces memory: hook the raw memory phi
4211 // from the expanded write barrier with the rest of the graph
4212 // which may require adding memory phis at every post dominated
4213 // region and at enclosing loop heads. Use the memory state
4214 // collected in memory_nodes to fix the memory graph. Update that
4215 // memory state as we go.
4216 fix_raw_mem(ctrl,region, init_raw_mem, raw_mem_for_ctrl, raw_mem_phi, memory_nodes, uses, phase);
4217 assert(ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count() == cnt - 1, "not replaced");
4218 }
4219
4220 assert(ShenandoahBarrierSetC2::bsc2()->state()->shenandoah_barriers_count() == 0, "all write barrier nodes should have been replaced");
4221 }
4222
4223 void ShenandoahWriteBarrierNode::move_evacuation_test_out_of_loop(IfNode* iff, PhaseIdealLoop* phase) {
4224 // move test and its mem barriers out of the loop
4225 assert(is_evacuation_in_progress_test(iff), "inconsistent");
4226
4227 IdealLoopTree *loop = phase->get_loop(iff);
4228 Node* loop_head = loop->_head;
4229 Node* entry_c = loop_head->in(LoopNode::EntryControl);
4230
4231 Node* load = iff->in(1)->in(1)->in(1)->in(1);
4232 assert(is_gc_state_load(load), "broken");
4233 if (!phase->is_dominator(load->in(0), entry_c)) {
4234 Node* mem_ctrl = NULL;
4235 Node* mem = dom_mem(load->in(MemNode::Memory), loop_head, Compile::AliasIdxRaw, mem_ctrl, phase);
4236 phase->igvn().replace_input_of(load, MemNode::Memory, mem);
4237 phase->igvn().replace_input_of(load, 0, entry_c);
4238 phase->set_ctrl_and_loop(load, entry_c);
4239 }
4240 }
4241
4242 void ShenandoahWriteBarrierNode::move_heap_stable_test_out_of_loop(IfNode* iff, PhaseIdealLoop* phase) {
4243 IdealLoopTree *loop = phase->get_loop(iff);
4244 Node* loop_head = loop->_head;
4245 Node* entry_c = loop_head->in(LoopNode::EntryControl);
4246
4247 Node* load = iff->in(1)->in(1)->in(1);
4248 assert(is_gc_state_load(load), "broken");
4249 if (!phase->is_dominator(load->in(0), entry_c)) {
4250 Node* mem_ctrl = NULL;
4251 Node* mem = dom_mem(load->in(MemNode::Memory), loop_head, Compile::AliasIdxRaw, mem_ctrl, phase);
4252 phase->igvn().replace_input_of(load, MemNode::Memory, mem);
4253 phase->igvn().replace_input_of(load, 0, entry_c);
4254 phase->set_ctrl_and_loop(load, entry_c);
4255 }
4256 }
4257
4258 void ShenandoahWriteBarrierNode::merge_back_to_back_tests(Node* n, PhaseIdealLoop* phase) {
4259 assert(is_evacuation_in_progress_test(n) || is_heap_stable_test(n), "no other tests");
4260 if (phase->identical_backtoback_ifs(n)) {
4261 Node* n_ctrl = is_evacuation_in_progress_test(n) ? ShenandoahWriteBarrierNode::evacuation_in_progress_test_ctrl(n) : n->in(0);
4262 if (phase->can_split_if(n_ctrl)) {
4263 IfNode* dom_if = phase->idom(n_ctrl)->as_If();
4264 if (is_heap_stable_test(n)) {
4265 Node* gc_state_load = n->in(1)->in(1)->in(1);
4266 assert(is_gc_state_load(gc_state_load), "broken");
4267 Node* dom_gc_state_load = dom_if->in(1)->in(1)->in(1);
4268 assert(is_gc_state_load(dom_gc_state_load), "broken");
4269 if (gc_state_load != dom_gc_state_load) {
4270 phase->igvn().replace_node(gc_state_load, dom_gc_state_load);
4271 }
4272 }
4273 PhiNode* bolphi = PhiNode::make_blank(n_ctrl, n->in(1));
4274 Node* proj_true = dom_if->proj_out(1);
4275 Node* proj_false = dom_if->proj_out(0);
4276 Node* con_true = phase->igvn().makecon(TypeInt::ONE);
4277 Node* con_false = phase->igvn().makecon(TypeInt::ZERO);
4278
4279 for (uint i = 1; i < n_ctrl->req(); i++) {
4280 if (phase->is_dominator(proj_true, n_ctrl->in(i))) {
4281 bolphi->init_req(i, con_true);
4282 } else {
4283 assert(phase->is_dominator(proj_false, n_ctrl->in(i)), "bad if");
4284 bolphi->init_req(i, con_false);
4285 }
4286 }
4287 phase->register_new_node(bolphi, n_ctrl);
4288 phase->igvn().replace_input_of(n, 1, bolphi);
4289 phase->do_split_if(n);
4290 }
4291 }
4292 }
4293
4294 void ShenandoahWriteBarrierNode::optimize_after_expansion(VectorSet &visited, Node_Stack &stack, Node_List &old_new, PhaseIdealLoop* phase) {
4295 Node_List heap_stable_tests;
4296 Node_List evacuation_tests;
4297 Node_List gc_state_loads;
4298
4299 stack.push(phase->C->start(), 0);
4300 do {
4301 Node* n = stack.node();
4302 uint i = stack.index();
4303
4304 if (i < n->outcnt()) {
4305 Node* u = n->raw_out(i);
4306 stack.set_index(i+1);
4307 if (!visited.test_set(u->_idx)) {
4308 stack.push(u, 0);
4309 }
4310 } else {
4311 stack.pop();
4312 if (n->is_If() && ShenandoahWriteBarrierNode::is_evacuation_in_progress_test(n)) {
4313 evacuation_tests.push(n);
4314 }
4315 if (ShenandoahCommonGCStateLoads && ShenandoahWriteBarrierNode::is_gc_state_load(n)) {
4316 gc_state_loads.push(n);
4317 }
4318 if (n->is_If() && ShenandoahWriteBarrierNode::is_heap_stable_test(n)) {
4319 heap_stable_tests.push(n);
4320 }
4321 }
4322 } while (stack.size() > 0);
4323
4324 bool progress;
4325 do {
4326 progress = false;
4327 for (uint i = 0; i < gc_state_loads.size(); i++) {
4328 Node* n = gc_state_loads.at(i);
4329 if (n->outcnt() != 0) {
4330 progress |= ShenandoahWriteBarrierNode::try_common_gc_state_load(n, phase);
4331 }
4332 }
4333 } while (progress);
4334
4335 for (uint i = 0; i < heap_stable_tests.size(); i++) {
4336 Node* n = heap_stable_tests.at(i);
4337 assert(is_heap_stable_test(n), "only evacuation test");
4338 merge_back_to_back_tests(n, phase);
4339 }
4340
4341 if (!phase->C->major_progress()) {
4342 for (uint i = 0; i < evacuation_tests.size(); i++) {
4343 Node* n = evacuation_tests.at(i);
4344 assert(is_evacuation_in_progress_test(n), "only evacuation test");
4345 merge_back_to_back_tests(n, phase);
4346 }
4347 }
4348
4349 if (!phase->C->major_progress()) {
4350 VectorSet seen(Thread::current()->resource_area());
4351 for (uint i = 0; i < heap_stable_tests.size(); i++) {
4352 Node* n = heap_stable_tests.at(i);
4353 IdealLoopTree* loop = phase->get_loop(n);
4354 if (loop != phase->ltree_root() &&
4355 loop->_child == NULL &&
4356 !loop->_irreducible) {
4357 LoopNode* head = loop->_head->as_Loop();
4358 if ((!head->is_CountedLoop() || head->as_CountedLoop()->is_main_loop() || head->as_CountedLoop()->is_normal_loop()) &&
4359 !seen.test_set(head->_idx) &&
4360 loop->policy_unswitching(phase, true)) {
4361 IfNode* iff = phase->find_unswitching_candidate(loop, true);
4362 if (iff != NULL && (is_evacuation_in_progress_test(iff) || is_heap_stable_test(iff))) {
4363 if (head->is_strip_mined()) {
4364 head->verify_strip_mined(0);
4365 OuterStripMinedLoopNode* outer = head->as_CountedLoop()->outer_loop();
4366 OuterStripMinedLoopEndNode* le = head->outer_loop_end();
4367 Node* new_outer = new LoopNode(outer->in(LoopNode::EntryControl), outer->in(LoopNode::LoopBackControl));
4368 phase->register_control(new_outer, phase->get_loop(outer), outer->in(LoopNode::EntryControl));
4369 Node* new_le = new IfNode(le->in(0), le->in(1), le->_prob, le->_fcnt);
4370 phase->register_control(new_le, phase->get_loop(le), le->in(0));
4371 phase->lazy_replace(outer, new_outer);
4372 phase->lazy_replace(le, new_le);
4373 head->clear_strip_mined();
4374 }
4375 phase->do_unswitching(loop, old_new, true);
4376 }
4377 }
4378 }
4379 }
4380 }
4381 }
4382
4383 #ifdef ASSERT
4384 void ShenandoahBarrierNode::verify_raw_mem(RootNode* root) {
4385 const bool trace = false;
4386 ResourceMark rm;
4387 Unique_Node_List nodes;
4388 Unique_Node_List controls;
4389 Unique_Node_List memories;
4390
4391 nodes.push(root);
4392 for (uint next = 0; next < nodes.size(); next++) {
4393 Node *n = nodes.at(next);
4394 if (n->Opcode() == Op_CallLeafNoFP && n->as_Call()->_entry_point == ShenandoahBarrierSetAssembler::shenandoah_wb_C()) {
4395 controls.push(n);
4396 if (trace) { tty->print("XXXXXX verifying"); n->dump(); }
4397 for (uint next2 = 0; next2 < controls.size(); next2++) {
4398 Node *m = controls.at(next2);
4399 if (!m->is_Loop() || controls.member(m->in(LoopNode::EntryControl)) || 1) {
4400 for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax; i++) {
4401 Node* u = m->fast_out(i);
4402 if (u->is_CFG() && !u->is_Root() &&
4403 !(u->Opcode() == Op_CProj && u->in(0)->Opcode() == Op_NeverBranch && u->as_Proj()->_con == 1) &&
4404 !(u->is_Region() && u->unique_ctrl_out()->Opcode() == Op_Halt)) {
4405 if (trace) { tty->print("XXXXXX pushing control"); u->dump(); }
4406 controls.push(u);
4407 }
4408 }
4409 }
4410 }
4411 memories.push(n->as_Call()->proj_out(TypeFunc::Memory));
4412 for (uint next2 = 0; next2 < memories.size(); next2++) {
4413 Node *m = memories.at(next2);
4414 assert(m->bottom_type() == Type::MEMORY, "");
4415 if (!m->is_Phi() || !m->in(0)->is_Loop() || controls.member(m->in(0)->in(LoopNode::EntryControl)) || 1) {
4416 for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax; i++) {
4417 Node* u = m->fast_out(i);
4418 if (u->bottom_type() == Type::MEMORY && (u->is_Mem() || u->is_ClearArray())) {
4419 if (trace) { tty->print("XXXXXX pushing memory"); u->dump(); }
4420 memories.push(u);
4421 } else if (u->is_LoadStore()) {
4422 if (trace) { tty->print("XXXXXX pushing memory"); u->find_out_with(Op_SCMemProj)->dump(); }
4423 memories.push(u->find_out_with(Op_SCMemProj));
4424 } else if (u->is_MergeMem() && u->as_MergeMem()->memory_at(Compile::AliasIdxRaw) == m) {
4425 if (trace) { tty->print("XXXXXX pushing memory"); u->dump(); }
4426 memories.push(u);
4427 } else if (u->is_Phi()) {
4428 assert(u->bottom_type() == Type::MEMORY, "");
4429 if (u->adr_type() == TypeRawPtr::BOTTOM || u->adr_type() == TypePtr::BOTTOM) {
4430 assert(controls.member(u->in(0)), "");
4431 if (trace) { tty->print("XXXXXX pushing memory"); u->dump(); }
4432 memories.push(u);
4433 }
4434 } else if (u->is_SafePoint() || u->is_MemBar()) {
4435 for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) {
4436 Node* uu = u->fast_out(j);
4437 if (uu->bottom_type() == Type::MEMORY) {
4438 if (trace) { tty->print("XXXXXX pushing memory"); uu->dump(); }
4439 memories.push(uu);
4440 }
4441 }
4442 }
4443 }
4444 }
4445 }
4446 for (uint next2 = 0; next2 < controls.size(); next2++) {
4447 Node *m = controls.at(next2);
4448 if (m->is_Region()) {
4449 bool all_in = true;
4450 for (uint i = 1; i < m->req(); i++) {
4451 if (!controls.member(m->in(i))) {
4452 all_in = false;
4453 break;
4454 }
4455 }
4456 if (trace) { tty->print("XXX verifying %s", all_in ? "all in" : ""); m->dump(); }
4457 bool found_phi = false;
4458 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax && !found_phi; j++) {
4459 Node* u = m->fast_out(j);
4460 if (u->is_Phi() && memories.member(u)) {
4461 found_phi = true;
4462 for (uint i = 1; i < u->req() && found_phi; i++) {
4463 Node* k = u->in(i);
4464 if (memories.member(k) != controls.member(m->in(i))) {
4465 found_phi = false;
4466 }
4467 }
4468 }
4469 }
4470 assert(found_phi || all_in, "");
4471 }
4472 }
4473 controls.clear();
4474 memories.clear();
4475 }
4476 for( uint i = 0; i < n->len(); ++i ) {
4477 Node *m = n->in(i);
4478 if (m != NULL) {
4479 nodes.push(m);
4480 }
4481 }
4482 }
4483 }
4484 #endif
4485
4486 static bool is_on_null_check_path(Block* b, Block* null_check_block) {
4487 if (null_check_block == NULL) {
4488 return false;
4489 }
4490 do {
4491 assert(null_check_block->_num_succs == 1, "only one succ on the path to unc");
4492 if (b == null_check_block) {
4493 return true;
4494 }
4495 null_check_block = null_check_block->_succs[0];
4496 } while(!null_check_block->head()->is_Root());
4497
4498 return false;
4499 }
4500
4501 int PhaseCFG::replace_uses_with_shenandoah_barrier_helper(Node* n, Node* use, Node* val, Block* block, Block* null_check_block) {
4502 int nb = 0;
4503 Block* buse = get_block_for_node(use);
4504 if (is_on_null_check_path(buse, null_check_block)) {
4505 return 0;
4506 }
4507 if (use->is_Phi()) {
4508 for (uint j = 1; j < use->req(); j++) {
4509 if (use->in(j) == val) {
4510 Block* b = get_block_for_node(use->in(0)->in(j));
4511 if ((block != b && block->dom_lca(b) == block) ||
4512 block == b) {
4513 use->set_req(j, n);
4514 nb++;
4515 }
4516 }
4517 }
4518 } else {
4519 if ((block != buse && block->dom_lca(buse) == block) ||
4520 (block == buse && !use->is_scheduled())) {
4521 // Let precedence edges alone (can confuse anti-dependence verification code)
4522 for (uint i = 0; i < use->req(); i++) {
4523 if (use->in(i) == val) {
4524 use->set_req(i, n);
4525 nb++;
4526 }
4527 }
4528 assert(nb > 0 || use->find_prec_edge(val) != -1, "no replacement?");
4529 }
4530 }
4531
4532 return nb;
4533 }
4534
4535 void PhaseCFG::replace_uses_with_shenandoah_barrier(Node* n, Block* block, Node_List& worklist, GrowableArray<int>& ready_cnt, uint max_idx, uint& phi_cnt) {
4536 // Replace all uses of barrier's input that are dominated by the
4537 // barrier with the value returned by the barrier: no need to keep
4538 // both live.
4539 if (n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_ShenandoahReadBarrier) {
4540 MachNullCheckNode* null_check = NULL;
4541 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax && null_check == NULL; i++) {
4542 Node* use = n->fast_out(i);
4543 if (use->is_MachNullCheck()) {
4544 null_check = use->as_MachNullCheck();
4545 }
4546 }
4547 Block* null_check_block = NULL;
4548 if (null_check != NULL) {
4549 Node* proj = null_check->find_out_with(Op_IfTrue);
4550 Node* head = proj->unique_out();
4551 null_check_block = get_block_for_node(head);
4552 }
4553
4554 Node* val = n->in(ShenandoahBarrierNode::ValueIn);
4555 if (!val->bottom_type()->isa_narrowoop()) {
4556 for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) {
4557 Node* use = val->fast_out(i);
4558 if (use != n) {
4559 int nb = replace_uses_with_shenandoah_barrier_helper(n, use, val, block, null_check_block);
4560 if (nb > 0) {
4561 --i; imax -= nb;
4562 }
4563 }
4564 }
4565 } else {
4566 for (DUIterator_Fast imax, i = val->fast_outs(imax); i < imax; i++) {
4567 Node* u = val->fast_out(i);
4568 if (u->is_Mach() && u->as_Mach()->ideal_Opcode() == Op_DecodeN) {
4569 int projs = 0;
4570 for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) {
4571 Node* uu = u->fast_out(j);
4572 assert(!uu->is_MachTemp(), "");
4573 if (uu->is_MachProj() && uu->outcnt() == 0) {
4574 projs++;
4575 } else {
4576 int nb = replace_uses_with_shenandoah_barrier_helper(n, uu, u, block, null_check_block);
4577 if (nb > 0) {
4578 if (!u->is_scheduled()) {
4579 push_ready_nodes(n, uu, block, ready_cnt, worklist, max_idx, nb);
4580 }
4581 --j; jmax -= nb;
4582 }
4583 }
4584 }
4585 // The DecodeN may have gone dead
4586 if (u->outcnt() - projs == 0) {
4587 u->disconnect_inputs(NULL, C);
4588 Block* bu = get_block_for_node(u);
4589 unmap_node_from_block(u);
4590 if (bu == block) {
4591 if (u->is_scheduled()) {
4592 block->find_remove(u);
4593 phi_cnt--;
4594 } else {
4595 worklist.yank(u);
4596 block->remove_node(block->end_idx()-1);
4597 }
4598 } else {
4599 bu->find_remove(u);
4600 }
4601 for (DUIterator_Fast jmax, j = u->fast_outs(jmax); j < jmax; j++) {
4602 Node* uu = u->fast_out(j);
4603 assert(uu->is_MachProj() && uu->outcnt() == 0, "");
4604 assert(bu == get_block_for_node(uu), "");
4605 uu->disconnect_inputs(NULL, C);
4606 --j; --jmax;
4607 unmap_node_from_block(uu);
4608 if (bu == block) {
4609 if (u->is_scheduled()) {
4610 block->find_remove(uu);
4611 phi_cnt--;
4612 } else {
4613 worklist.yank(uu);
4614 block->remove_node(block->end_idx()-1);
4615 }
4616 } else {
4617 bu->find_remove(uu);
4618 }
4619 assert(uu->is_scheduled() == u->is_scheduled(), "");
4620 }
4621 --i; --imax;
4622 }
4623 }
4624 }
4625 }
4626 }
4627 }