5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "compiler/compileLog.hpp"
26 #include "gc/shared/collectedHeap.inline.hpp"
27 #include "gc/shared/tlab_globals.hpp"
28 #include "libadt/vectset.hpp"
29 #include "memory/universe.hpp"
30 #include "opto/addnode.hpp"
31 #include "opto/arraycopynode.hpp"
32 #include "opto/callnode.hpp"
33 #include "opto/castnode.hpp"
34 #include "opto/cfgnode.hpp"
35 #include "opto/compile.hpp"
36 #include "opto/convertnode.hpp"
37 #include "opto/graphKit.hpp"
38 #include "opto/intrinsicnode.hpp"
39 #include "opto/locknode.hpp"
40 #include "opto/loopnode.hpp"
41 #include "opto/macro.hpp"
42 #include "opto/memnode.hpp"
43 #include "opto/narrowptrnode.hpp"
44 #include "opto/node.hpp"
45 #include "opto/opaquenode.hpp"
46 #include "opto/phaseX.hpp"
47 #include "opto/reachability.hpp"
48 #include "opto/rootnode.hpp"
49 #include "opto/runtime.hpp"
50 #include "opto/subnode.hpp"
51 #include "opto/subtypenode.hpp"
52 #include "opto/type.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "runtime/continuation.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "utilities/globalDefinitions.hpp"
57 #include "utilities/macros.hpp"
58 #include "utilities/powerOfTwo.hpp"
59 #if INCLUDE_G1GC
60 #include "gc/g1/g1ThreadLocalData.hpp"
61 #endif // INCLUDE_G1GC
62
63
64 //
65 // Replace any references to "oldref" in inputs to "use" with "newref".
66 // Returns the number of replacements made.
67 //
68 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) {
69 int nreplacements = 0;
70 uint req = use->req();
71 for (uint j = 0; j < use->len(); j++) {
72 Node *uin = use->in(j);
73 if (uin == oldref) {
74 if (j < req)
75 use->set_req(j, newref);
76 else
77 use->set_prec(j, newref);
78 nreplacements++;
79 } else if (j >= req && uin == nullptr) {
80 break;
81 }
82 }
83 return nreplacements;
84 }
85
86 void PhaseMacroExpand::migrate_outs(Node *old, Node *target) {
87 assert(old != nullptr, "sanity");
88 for (DUIterator_Fast imax, i = old->fast_outs(imax); i < imax; i++) {
89 Node* use = old->fast_out(i);
90 _igvn.rehash_node_delayed(use);
91 imax -= replace_input(use, old, target);
92 // back up iterator
93 --i;
94 }
95 assert(old->outcnt() == 0, "all uses must be deleted");
96 }
97
98 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word) {
99 Node* cmp = word;
100 Node* bol = transform_later(new BoolNode(cmp, BoolTest::ne));
101 IfNode* iff = new IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
102 transform_later(iff);
103
104 // Fast path taken.
105 Node *fast_taken = transform_later(new IfFalseNode(iff));
106
107 // Fast path not-taken, i.e. slow path
108 Node *slow_taken = transform_later(new IfTrueNode(iff));
109
110 region->init_req(edge, fast_taken); // Capture fast-control
111 return slow_taken;
112 }
113
114 //--------------------copy_predefined_input_for_runtime_call--------------------
115 void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) {
116 // Set fixed predefined input arguments
129 // Slow-path call
130 CallNode *call = leaf_name
131 ? (CallNode*)new CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM )
132 : (CallNode*)new CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), TypeRawPtr::BOTTOM );
133
134 // Slow path call has no side-effects, uses few values
135 copy_predefined_input_for_runtime_call(slow_path, oldcall, call );
136 if (parm0 != nullptr) call->init_req(TypeFunc::Parms+0, parm0);
137 if (parm1 != nullptr) call->init_req(TypeFunc::Parms+1, parm1);
138 if (parm2 != nullptr) call->init_req(TypeFunc::Parms+2, parm2);
139 call->copy_call_debug_info(&_igvn, oldcall);
140 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
141 _igvn.replace_node(oldcall, call);
142 transform_later(call);
143
144 return call;
145 }
146
147 void PhaseMacroExpand::eliminate_gc_barrier(Node* p2x) {
148 BarrierSetC2 *bs = BarrierSet::barrier_set()->barrier_set_c2();
149 bs->eliminate_gc_barrier(this, p2x);
150 #ifndef PRODUCT
151 if (PrintOptoStatistics) {
152 AtomicAccess::inc(&PhaseMacroExpand::_GC_barriers_removed_counter);
153 }
154 #endif
155 }
156
157 // Search for a memory operation for the specified memory slice.
158 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) {
159 Node *orig_mem = mem;
160 Node *alloc_mem = alloc->as_Allocate()->proj_out_or_null(TypeFunc::Memory, /*io_use:*/false);
161 assert(alloc_mem != nullptr, "Allocation without a memory projection.");
162 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr();
163 while (true) {
164 if (mem == alloc_mem || mem == start_mem ) {
165 return mem; // hit one of our sentinels
166 } else if (mem->is_MergeMem()) {
167 mem = mem->as_MergeMem()->memory_at(alias_idx);
168 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) {
169 Node *in = mem->in(0);
172 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) {
173 return in;
174 } else if (in->is_Call()) {
175 CallNode *call = in->as_Call();
176 if (call->may_modify(tinst, phase)) {
177 assert(call->is_ArrayCopy(), "ArrayCopy is the only call node that doesn't make allocation escape");
178 if (call->as_ArrayCopy()->modifies(offset, offset, phase, false)) {
179 return in;
180 }
181 }
182 mem = in->in(TypeFunc::Memory);
183 } else if (in->is_MemBar()) {
184 ArrayCopyNode* ac = nullptr;
185 if (ArrayCopyNode::may_modify(tinst, in->as_MemBar(), phase, ac)) {
186 if (ac != nullptr) {
187 assert(ac->is_clonebasic(), "Only basic clone is a non escaping clone");
188 return ac;
189 }
190 }
191 mem = in->in(TypeFunc::Memory);
192 } else {
193 #ifdef ASSERT
194 in->dump();
195 mem->dump();
196 assert(false, "unexpected projection");
197 #endif
198 }
199 } else if (mem->is_Store()) {
200 const TypePtr* atype = mem->as_Store()->adr_type();
201 int adr_idx = phase->C->get_alias_index(atype);
202 if (adr_idx == alias_idx) {
203 assert(atype->isa_oopptr(), "address type must be oopptr");
204 int adr_offset = atype->offset();
205 uint adr_iid = atype->is_oopptr()->instance_id();
206 // Array elements references have the same alias_idx
207 // but different offset and different instance_id.
208 if (adr_offset == offset && adr_iid == alloc->_idx) {
209 return mem;
210 }
211 } else {
212 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw");
213 }
214 mem = mem->in(MemNode::Memory);
215 } else if (mem->is_ClearArray()) {
216 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) {
217 // Can not bypass initialization of the instance
218 // we are looking.
219 DEBUG_ONLY(intptr_t offset;)
220 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity");
221 InitializeNode* init = alloc->as_Allocate()->initialization();
222 // We are looking for stored value, return Initialize node
223 // or memory edge from Allocate node.
224 if (init != nullptr) {
229 }
230 // Otherwise skip it (the call updated 'mem' value).
231 } else if (mem->Opcode() == Op_SCMemProj) {
232 mem = mem->in(0);
233 Node* adr = nullptr;
234 if (mem->is_LoadStore()) {
235 adr = mem->in(MemNode::Address);
236 } else {
237 assert(mem->Opcode() == Op_EncodeISOArray ||
238 mem->Opcode() == Op_StrCompressedCopy, "sanity");
239 adr = mem->in(3); // Destination array
240 }
241 const TypePtr* atype = adr->bottom_type()->is_ptr();
242 int adr_idx = phase->C->get_alias_index(atype);
243 if (adr_idx == alias_idx) {
244 DEBUG_ONLY(mem->dump();)
245 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
246 return nullptr;
247 }
248 mem = mem->in(MemNode::Memory);
249 } else if (mem->Opcode() == Op_StrInflatedCopy) {
250 Node* adr = mem->in(3); // Destination array
251 const TypePtr* atype = adr->bottom_type()->is_ptr();
252 int adr_idx = phase->C->get_alias_index(atype);
253 if (adr_idx == alias_idx) {
254 DEBUG_ONLY(mem->dump();)
255 assert(false, "Object is not scalar replaceable if a StrInflatedCopy node accesses its field");
256 return nullptr;
257 }
258 mem = mem->in(MemNode::Memory);
259 } else {
260 return mem;
261 }
262 assert(mem != orig_mem, "dead memory loop");
263 }
264 }
265
266 // Determine if there is an interfering store between a rematerialization load and an arraycopy that is in the process
267 // of being elided. Starting from the given rematerialization load this method starts a BFS traversal upwards through
268 // the memory graph towards the provided ArrayCopyNode. For every node encountered on the traversal, check that it is
269 // independent from the provided rematerialization. Returns false if every node on the traversal is independent and
309 // Generate loads from source of the arraycopy for fields of destination needed at a deoptimization point.
310 // Returns nullptr if the load cannot be created because the arraycopy is not suitable for elimination
311 // (e.g. copy inside the array with non-constant offsets) or the inputs do not match our assumptions (e.g.
312 // the arraycopy does not actually write something at the provided offset).
313 Node* PhaseMacroExpand::make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, Node* mem, BasicType ft, const Type* ftype, AllocateNode* alloc) {
314 assert((ctl == ac->control() && mem == ac->memory()) != (mem != ac->memory() && ctl->is_Proj() && ctl->as_Proj()->is_uncommon_trap_proj()),
315 "Either the control and memory are the same as for the arraycopy or they are pinned in an uncommon trap.");
316 BasicType bt = ft;
317 const Type *type = ftype;
318 if (ft == T_NARROWOOP) {
319 bt = T_OBJECT;
320 type = ftype->make_oopptr();
321 }
322 Node* base = ac->in(ArrayCopyNode::Src);
323 Node* adr = nullptr;
324 const TypePtr* adr_type = nullptr;
325
326 if (ac->is_clonebasic()) {
327 assert(ac->in(ArrayCopyNode::Src) != ac->in(ArrayCopyNode::Dest), "clone source equals destination");
328 adr = _igvn.transform(AddPNode::make_with_base(base, _igvn.MakeConX(offset)));
329 adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
330 } else {
331 if (!ac->modifies(offset, offset, &_igvn, true)) {
332 // If the arraycopy does not copy to this offset, we cannot generate a rematerialization load for it.
333 return nullptr;
334 }
335 assert(ac->in(ArrayCopyNode::Dest) == alloc->result_cast(), "arraycopy destination should be allocation's result");
336 uint shift = exact_log2(type2aelembytes(bt));
337 Node* src_pos = ac->in(ArrayCopyNode::SrcPos);
338 Node* dest_pos = ac->in(ArrayCopyNode::DestPos);
339 const TypeInt* src_pos_t = _igvn.type(src_pos)->is_int();
340 const TypeInt* dest_pos_t = _igvn.type(dest_pos)->is_int();
341
342 if (src_pos_t->is_con() && dest_pos_t->is_con()) {
343 intptr_t off = ((src_pos_t->get_con() - dest_pos_t->get_con()) << shift) + offset;
344 adr = _igvn.transform(AddPNode::make_with_base(base, _igvn.MakeConX(off)));
345 adr_type = _igvn.type(base)->is_ptr()->add_offset(off);
346 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
347 // Don't emit a new load from src if src == dst but try to get the value from memory instead
348 return value_from_mem(ac, ctl, ft, ftype, adr_type->isa_oopptr(), alloc);
349 }
350 } else {
351 Node* diff = _igvn.transform(new SubINode(ac->in(ArrayCopyNode::SrcPos), ac->in(ArrayCopyNode::DestPos)));
352 #ifdef _LP64
353 diff = _igvn.transform(new ConvI2LNode(diff));
354 #endif
355 diff = _igvn.transform(new LShiftXNode(diff, _igvn.intcon(shift)));
356
357 Node* off = _igvn.transform(new AddXNode(_igvn.MakeConX(offset), diff));
358 adr = _igvn.transform(AddPNode::make_with_base(base, off));
359 adr_type = _igvn.type(base)->is_ptr()->add_offset(Type::OffsetBot);
360 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
361 // Non constant offset in the array: we can't statically
362 // determine the value
363 return nullptr;
364 }
365 }
366 }
367 assert(adr != nullptr && adr_type != nullptr, "sanity");
368
369 // Create the rematerialization load ...
370 MergeMemNode* mergemem = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
371 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
372 Node* res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemem, adr, adr_type, type, bt);
373 assert(res != nullptr, "load should have been created");
374
375 // ... and ensure that pinning the rematerialization load inside the uncommon path is safe.
376 if (mem != ac->memory() && ctl->is_Proj() && ctl->as_Proj()->is_uncommon_trap_proj() && res->is_Load() &&
377 has_interfering_store(ac, res->as_Load(), &_igvn)) {
378 // Not safe: use control and memory from the arraycopy to ensure correct memory state.
379 _igvn.remove_dead_node(res, PhaseIterGVN::NodeOrigin::Graph); // Clean up the unusable rematerialization load.
380 return make_arraycopy_load(ac, offset, ac->control(), ac->memory(), ft, ftype, alloc);
381 }
382
383 if (ftype->isa_narrowoop()) {
384 // PhaseMacroExpand::scalar_replacement adds DecodeN nodes
385 res = _igvn.transform(new EncodePNode(res, ftype));
386 }
387 return res;
388 }
389
390 //
391 // Given a Memory Phi, compute a value Phi containing the values from stores
392 // on the input paths.
393 // Note: this function is recursive, its depth is limited by the "level" argument
394 // Returns the computed Phi, or null if it cannot compute it.
395 Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *phi_type, const TypeOopPtr *adr_t, AllocateNode *alloc, Node_Stack *value_phis, int level) {
396 assert(mem->is_Phi(), "sanity");
397 int alias_idx = C->get_alias_index(adr_t);
398 int offset = adr_t->offset();
399 int instance_id = adr_t->instance_id();
400
401 // Check if an appropriate value phi already exists.
402 Node* region = mem->in(0);
403 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) {
404 Node* phi = region->fast_out(k);
405 if (phi->is_Phi() && phi != mem &&
406 phi->as_Phi()->is_same_inst_field(phi_type, (int)mem->_idx, instance_id, alias_idx, offset)) {
407 return phi;
408 }
409 }
410 // Check if an appropriate new value phi already exists.
411 Node* new_phi = value_phis->find(mem->_idx);
412 if (new_phi != nullptr)
413 return new_phi;
414
415 if (level <= 0) {
416 return nullptr; // Give up: phi tree too deep
417 }
418 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
419 Node *alloc_mem = alloc->proj_out_or_null(TypeFunc::Memory, /*io_use:*/false);
420 assert(alloc_mem != nullptr, "Allocation without a memory projection.");
421
422 uint length = mem->req();
423 GrowableArray <Node *> values(length, length, nullptr);
424
425 // create a new Phi for the value
426 PhiNode *phi = new PhiNode(mem->in(0), phi_type, nullptr, mem->_idx, instance_id, alias_idx, offset);
427 transform_later(phi);
428 value_phis->push(phi, mem->_idx);
429
430 for (uint j = 1; j < length; j++) {
431 Node *in = mem->in(j);
432 if (in == nullptr || in->is_top()) {
433 values.at_put(j, in);
434 } else {
435 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn);
436 if (val == start_mem || val == alloc_mem) {
437 // hit a sentinel, return appropriate 0 value
438 values.at_put(j, _igvn.zerocon(ft));
439 continue;
440 }
441 if (val->is_Initialize()) {
442 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
443 }
444 if (val == nullptr) {
445 return nullptr; // can't find a value on this path
446 }
447 if (val == mem) {
448 values.at_put(j, mem);
449 } else if (val->is_Store()) {
450 Node* n = val->in(MemNode::ValueIn);
451 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
452 n = bs->step_over_gc_barrier(n);
453 if (is_subword_type(ft)) {
454 n = Compile::narrow_value(ft, n, phi_type, &_igvn, true);
455 }
456 values.at_put(j, n);
457 } else if(val->is_Proj() && val->in(0) == alloc) {
458 values.at_put(j, _igvn.zerocon(ft));
459 } else if (val->is_Phi()) {
460 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1);
461 if (val == nullptr) {
462 return nullptr;
463 }
464 values.at_put(j, val);
465 } else if (val->Opcode() == Op_SCMemProj) {
466 assert(val->in(0)->is_LoadStore() ||
467 val->in(0)->Opcode() == Op_EncodeISOArray ||
468 val->in(0)->Opcode() == Op_StrCompressedCopy, "sanity");
469 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
470 return nullptr;
471 } else if (val->is_ArrayCopy()) {
472 Node* res = make_arraycopy_load(val->as_ArrayCopy(), offset, val->in(0), val->in(TypeFunc::Memory), ft, phi_type, alloc);
473 if (res == nullptr) {
474 return nullptr;
475 }
476 values.at_put(j, res);
477 } else if (val->is_top()) {
478 // This indicates that this path into the phi is dead. Top will eventually also propagate into the Region.
479 // IGVN will clean this up later.
480 values.at_put(j, val);
481 } else {
482 DEBUG_ONLY( val->dump(); )
483 assert(false, "unknown node on this path");
484 return nullptr; // unknown node on this path
485 }
486 }
487 }
488 // Set Phi's inputs
489 for (uint j = 1; j < length; j++) {
490 if (values.at(j) == mem) {
491 phi->init_req(j, phi);
492 } else {
493 phi->init_req(j, values.at(j));
494 }
495 }
496 return phi;
497 }
498
499 // Search the last value stored into the object's field.
500 Node* PhaseMacroExpand::value_from_mem(Node* origin, Node* ctl, BasicType ft, const Type* ftype, const TypeOopPtr* adr_t, AllocateNode* alloc) {
501 assert(adr_t->is_known_instance_field(), "instance required");
502 int instance_id = adr_t->instance_id();
503 assert((uint)instance_id == alloc->_idx, "wrong allocation");
504
505 int alias_idx = C->get_alias_index(adr_t);
506 int offset = adr_t->offset();
507 Node* orig_mem = origin->in(TypeFunc::Memory);
508 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
509 Node *alloc_ctrl = alloc->in(TypeFunc::Control);
510 Node *alloc_mem = alloc->proj_out_or_null(TypeFunc::Memory, /*io_use:*/false);
511 assert(alloc_mem != nullptr, "Allocation without a memory projection.");
512 VectorSet visited;
513
514 bool done = orig_mem == alloc_mem;
515 Node *mem = orig_mem;
516 while (!done) {
517 if (visited.test_set(mem->_idx)) {
518 return nullptr; // found a loop, give up
519 }
520 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn);
521 if (mem == start_mem || mem == alloc_mem) {
522 done = true; // hit a sentinel, return appropriate 0 value
523 } else if (mem->is_Initialize()) {
524 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
525 if (mem == nullptr) {
526 done = true; // Something go wrong.
527 } else if (mem->is_Store()) {
528 const TypePtr* atype = mem->as_Store()->adr_type();
529 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice");
530 done = true;
531 }
532 } else if (mem->is_Store()) {
533 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr();
534 assert(atype != nullptr, "address type must be oopptr");
535 assert(C->get_alias_index(atype) == alias_idx &&
536 atype->is_known_instance_field() && atype->offset() == offset &&
537 atype->instance_id() == instance_id, "store is correct memory slice");
538 done = true;
539 } else if (mem->is_Phi()) {
540 // try to find a phi's unique input
541 Node *unique_input = nullptr;
542 Node *top = C->top();
543 for (uint i = 1; i < mem->req(); i++) {
544 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn);
545 if (n == nullptr || n == top || n == mem) {
546 continue;
547 } else if (unique_input == nullptr) {
548 unique_input = n;
549 } else if (unique_input != n) {
550 unique_input = top;
551 break;
552 }
553 }
554 if (unique_input != nullptr && unique_input != top) {
555 mem = unique_input;
556 } else {
557 done = true;
558 }
559 } else if (mem->is_ArrayCopy()) {
560 done = true;
561 } else if (mem->is_top()) {
562 // The slice is on a dead path. Returning nullptr would lead to elimination
563 // bailout, but we want to prevent that. Just forwarding the top is also legal,
564 // and IGVN can just clean things up, and remove whatever receives top.
565 return mem;
566 } else {
567 DEBUG_ONLY( mem->dump(); )
568 assert(false, "unexpected node");
569 }
570 }
571 if (mem != nullptr) {
572 if (mem == start_mem || mem == alloc_mem) {
573 // hit a sentinel, return appropriate 0 value
574 return _igvn.zerocon(ft);
575 } else if (mem->is_Store()) {
576 Node* n = mem->in(MemNode::ValueIn);
577 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
578 n = bs->step_over_gc_barrier(n);
579 return n;
580 } else if (mem->is_Phi()) {
581 // attempt to produce a Phi reflecting the values on the input paths of the Phi
582 Node_Stack value_phis(8);
583 Node* phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit);
584 if (phi != nullptr) {
585 return phi;
586 } else {
587 // Kill all new Phis
588 while(value_phis.is_nonempty()) {
589 Node* n = value_phis.node();
590 _igvn.replace_node(n, C->top());
591 value_phis.pop();
592 }
593 }
594 } else if (mem->is_ArrayCopy()) {
595 // Rematerialize the scalar-replaced array. If possible, pin the loads to the uncommon path of the uncommon trap.
596 // Check for each element of the source array, whether it was modified. If not, pin both memory and control to
597 // the uncommon path. Otherwise, use the control and memory state of the arraycopy. Control and memory state must
598 // come from the same source to prevent anti-dependence problems in the backend.
599 ArrayCopyNode* ac = mem->as_ArrayCopy();
600 Node* ac_ctl = ac->control();
601 Node* ac_mem = ac->memory();
602 if (ctl->is_Proj() && ctl->as_Proj()->is_uncommon_trap_proj()) {
603 // pin the loads in the uncommon trap path
604 ac_ctl = ctl;
605 ac_mem = orig_mem;
606 }
607 return make_arraycopy_load(ac, offset, ac_ctl, ac_mem, ft, ftype, alloc);
608 }
609 }
610 // Something went wrong.
611 return nullptr;
612 }
613
614 // Check the possibility of scalar replacement.
615 bool PhaseMacroExpand::can_eliminate_allocation(PhaseIterGVN* igvn, AllocateNode *alloc, GrowableArray <SafePointNode *>* safepoints) {
616 // Scan the uses of the allocation to check for anything that would
617 // prevent us from eliminating it.
618 NOT_PRODUCT( const char* fail_eliminate = nullptr; )
619 DEBUG_ONLY( Node* disq_node = nullptr; )
620 bool can_eliminate = true;
621 bool reduce_merge_precheck = (safepoints == nullptr);
622
623 Node* res = alloc->result_cast();
624 const TypeOopPtr* res_type = nullptr;
625 if (res == nullptr) {
626 // All users were eliminated.
627 } else if (!res->is_CheckCastPP()) {
628 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";)
629 can_eliminate = false;
630 } else {
631 res_type = igvn->type(res)->isa_oopptr();
632 if (res_type == nullptr) {
633 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";)
634 can_eliminate = false;
635 } else if (!res_type->klass_is_exact()) {
636 NOT_PRODUCT(fail_eliminate = "Not an exact type.";)
637 can_eliminate = false;
638 } else if (res_type->isa_aryptr()) {
639 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1);
640 if (length < 0) {
641 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";)
642 can_eliminate = false;
643 }
644 }
645 }
646
647 if (can_eliminate && res != nullptr) {
648 BarrierSetC2 *bs = BarrierSet::barrier_set()->barrier_set_c2();
649 for (DUIterator_Fast jmax, j = res->fast_outs(jmax);
650 j < jmax && can_eliminate; j++) {
651 Node* use = res->fast_out(j);
652
653 if (use->is_AddP()) {
654 const TypePtr* addp_type = igvn->type(use)->is_ptr();
655 int offset = addp_type->offset();
656
657 if (offset == Type::OffsetTop || offset == Type::OffsetBot) {
658 NOT_PRODUCT(fail_eliminate = "Undefined field reference";)
659 can_eliminate = false;
660 break;
661 }
662 for (DUIterator_Fast kmax, k = use->fast_outs(kmax);
663 k < kmax && can_eliminate; k++) {
664 Node* n = use->fast_out(k);
665 if (n->is_Mem() && n->as_Mem()->is_mismatched_access()) {
666 DEBUG_ONLY(disq_node = n);
667 NOT_PRODUCT(fail_eliminate = "Mismatched access");
668 can_eliminate = false;
669 }
670 if (!n->is_Store() && n->Opcode() != Op_CastP2X && !bs->is_gc_pre_barrier_node(n) && !reduce_merge_precheck) {
671 DEBUG_ONLY(disq_node = n;)
672 if (n->is_Load() || n->is_LoadStore()) {
673 NOT_PRODUCT(fail_eliminate = "Field load";)
674 } else {
675 NOT_PRODUCT(fail_eliminate = "Not store field reference";)
676 }
677 can_eliminate = false;
678 }
679 }
680 } else if (use->is_ArrayCopy() &&
681 (use->as_ArrayCopy()->is_clonebasic() ||
682 use->as_ArrayCopy()->is_arraycopy_validated() ||
683 use->as_ArrayCopy()->is_copyof_validated() ||
684 use->as_ArrayCopy()->is_copyofrange_validated()) &&
685 use->in(ArrayCopyNode::Dest) == res) {
686 // ok to eliminate
687 } else if (use->is_ReachabilityFence() && OptimizeReachabilityFences) {
688 // ok to eliminate
689 } else if (use->is_SafePoint()) {
690 SafePointNode* sfpt = use->as_SafePoint();
691 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) {
692 // Object is passed as argument.
693 DEBUG_ONLY(disq_node = use;)
694 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";)
695 can_eliminate = false;
696 }
697 Node* sfptMem = sfpt->memory();
698 if (sfptMem == nullptr || sfptMem->is_top()) {
699 DEBUG_ONLY(disq_node = use;)
700 NOT_PRODUCT(fail_eliminate = "null or TOP memory";)
701 can_eliminate = false;
702 } else if (!reduce_merge_precheck) {
703 safepoints->append_if_missing(sfpt);
704 }
705 } else if (reduce_merge_precheck &&
706 (use->is_Phi() || use->is_EncodeP() ||
707 use->Opcode() == Op_MemBarRelease ||
708 (UseStoreStoreForCtor && use->Opcode() == Op_MemBarStoreStore))) {
709 // Nothing to do
710 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark
711 if (use->is_Phi()) {
712 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) {
713 NOT_PRODUCT(fail_eliminate = "Object is return value";)
714 } else {
715 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";)
716 }
717 DEBUG_ONLY(disq_node = use;)
718 } else {
719 if (use->Opcode() == Op_Return) {
720 NOT_PRODUCT(fail_eliminate = "Object is return value";)
721 } else {
722 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";)
723 }
724 DEBUG_ONLY(disq_node = use;)
725 }
726 can_eliminate = false;
727 }
728 }
729 }
730
731 #ifndef PRODUCT
732 if (PrintEliminateAllocations && safepoints != nullptr) {
733 if (can_eliminate) {
734 tty->print("Scalar ");
735 if (res == nullptr)
736 alloc->dump();
737 else
738 res->dump();
739 } else if (alloc->_is_scalar_replaceable) {
740 tty->print("NotScalar (%s)", fail_eliminate);
741 if (res == nullptr)
742 alloc->dump();
743 else
744 res->dump();
745 #ifdef ASSERT
746 if (disq_node != nullptr) {
747 tty->print(" >>>> ");
748 disq_node->dump();
749 }
750 #endif /*ASSERT*/
751 }
752 }
753
754 if (TraceReduceAllocationMerges && !can_eliminate && reduce_merge_precheck) {
755 tty->print_cr("\tCan't eliminate allocation because '%s': ", fail_eliminate != nullptr ? fail_eliminate : "");
756 DEBUG_ONLY(if (disq_node != nullptr) disq_node->dump();)
757 }
758 #endif
759 return can_eliminate;
833 // CheckCastPP result was not updated in the stack slot, and so
834 // we ended up using the CastPP. That means that the field knows
835 // that it should get an oop from an interface, but the value lost
836 // that information, and so it is not a subtype.
837 // There may be other issues, feel free to investigate further!
838 if (!is_java_primitive(value_bt)) { return; }
839
840 tty->print_cr("value not compatible for field: %s vs %s",
841 type2name(value_bt),
842 type2name(field_bt));
843 tty->print("value_type: ");
844 value_type->dump();
845 tty->cr();
846 tty->print("field_type: ");
847 field_type->dump();
848 tty->cr();
849 assert(false, "value_type does not fit field_type");
850 }
851 #endif
852
853 SafePointScalarObjectNode* PhaseMacroExpand::create_scalarized_object_description(AllocateNode *alloc, SafePointNode* sfpt) {
854 assert(sfpt->jvms()->endoff() == sfpt->req(), "no extra edges past debug info allowed");
855
856 // Fields of scalar objs are referenced only at the end
857 // of regular debuginfo at the last (youngest) JVMS.
858 // Record relative start index.
859 ciInstanceKlass* iklass = nullptr;
860 BasicType basic_elem_type = T_ILLEGAL;
861 const Type* field_type = nullptr;
862 const TypeOopPtr* res_type = nullptr;
863 int nfields = 0;
864 int array_base = 0;
865 int element_size = 0;
866 uint first_ind = (sfpt->req() - sfpt->jvms()->scloff());
867 Node* res = alloc->result_cast();
868
869 assert(res == nullptr || res->is_CheckCastPP(), "unexpected AllocateNode result");
870 assert(sfpt->jvms() != nullptr, "missed JVMS");
871
872 if (res != nullptr) { // Could be null when there are no users
873 res_type = _igvn.type(res)->isa_oopptr();
874
875 if (res_type->isa_instptr()) {
876 // find the fields of the class which will be needed for safepoint debug information
877 iklass = res_type->is_instptr()->instance_klass();
878 nfields = iklass->nof_nonstatic_fields();
879 } else {
880 // find the array's elements which will be needed for safepoint debug information
881 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1);
882 assert(nfields >= 0, "must be an array klass.");
883 basic_elem_type = res_type->is_aryptr()->elem()->array_element_basic_type();
884 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
885 element_size = type2aelembytes(basic_elem_type);
886 field_type = res_type->is_aryptr()->elem();
887 }
888 }
889
890 SafePointScalarObjectNode* sobj = new SafePointScalarObjectNode(res_type, alloc, first_ind, sfpt->jvms()->depth(), nfields);
891 sobj->init_req(0, C->root());
892 transform_later(sobj);
893
894 // Scan object's fields adding an input to the safepoint for each field.
895 for (int j = 0; j < nfields; j++) {
896 intptr_t offset;
897 ciField* field = nullptr;
898 if (iklass != nullptr) {
899 field = iklass->nonstatic_field_at(j);
900 offset = field->offset_in_bytes();
901 ciType* elem_type = field->type();
902 basic_elem_type = field->layout_type();
903
904 // The next code is taken from Parse::do_get_xxx().
905 if (is_reference_type(basic_elem_type)) {
906 if (!elem_type->is_loaded()) {
907 field_type = TypeInstPtr::BOTTOM;
908 } else if (field != nullptr && field->is_static_constant()) {
909 ciObject* con = field->constant_value().as_object();
910 // Do not "join" in the previous type; it doesn't add value,
911 // and may yield a vacuous result if the field is of interface type.
912 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
913 assert(field_type != nullptr, "field singleton type must be consistent");
914 } else {
915 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
916 }
917 if (UseCompressedOops) {
918 field_type = field_type->make_narrowoop();
919 basic_elem_type = T_NARROWOOP;
920 }
921 } else {
922 field_type = Type::get_const_basic_type(basic_elem_type);
923 }
924 } else {
925 offset = array_base + j * (intptr_t)element_size;
926 }
927
928 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr();
929
930 Node* field_val = value_from_mem(sfpt, sfpt->control(), basic_elem_type, field_type, field_addr_type, alloc);
931
932 // We weren't able to find a value for this field,
933 // give up on eliminating this allocation.
934 if (field_val == nullptr) {
935 uint last = sfpt->req() - 1;
936 for (int k = 0; k < j; k++) {
937 sfpt->del_req(last--);
938 }
939 _igvn._worklist.push(sfpt);
940
941 #ifndef PRODUCT
942 if (PrintEliminateAllocations) {
943 if (field != nullptr) {
944 tty->print("=== At SafePoint node %d can't find value of field: ", sfpt->_idx);
945 field->print();
946 int field_idx = C->get_alias_index(field_addr_type);
947 tty->print(" (alias_idx=%d)", field_idx);
948 } else { // Array's element
949 tty->print("=== At SafePoint node %d can't find value of array element [%d]", sfpt->_idx, j);
950 }
951 tty->print(", which prevents elimination of: ");
952 if (res == nullptr)
953 alloc->dump();
954 else
955 res->dump();
956 }
957 #endif
958
959 return nullptr;
960 }
961
962 if (UseCompressedOops && field_type->isa_narrowoop()) {
963 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
964 // to be able scalar replace the allocation.
965 if (field_val->is_EncodeP()) {
966 field_val = field_val->in(1);
967 } else {
968 field_val = transform_later(new DecodeNNode(field_val, field_val->get_ptr_type()));
969 }
970 }
971 DEBUG_ONLY(verify_type_compatability(field_val->bottom_type(), field_type);)
972 sfpt->add_req(field_val);
973 }
974
975 sfpt->jvms()->set_endoff(sfpt->req());
976
977 return sobj;
978 }
979
980 // Do scalar replacement.
981 bool PhaseMacroExpand::scalar_replacement(AllocateNode* alloc, GrowableArray<SafePointNode*>& safepoints) {
982 GrowableArray<SafePointNode*> safepoints_done;
983 Node* res = alloc->result_cast();
984 assert(res == nullptr || res->is_CheckCastPP(), "unexpected AllocateNode result");
985
986 // Process the safepoint uses
987 while (safepoints.length() > 0) {
988 SafePointNode* sfpt = safepoints.pop();
989
990 SafePointNode::NodeEdgeTempStorage non_debug_edges_worklist(igvn());
991
992 // All sfpt inputs are implicitly included into debug info during the scalarization process below.
993 // Keep non-debug inputs separately, so they stay non-debug.
994 sfpt->remove_non_debug_edges(non_debug_edges_worklist);
995
996 SafePointScalarObjectNode* sobj = create_scalarized_object_description(alloc, sfpt);
997
998 if (sobj == nullptr) {
999 sfpt->restore_non_debug_edges(non_debug_edges_worklist);
1000 undo_previous_scalarizations(safepoints_done, alloc);
1001 return false;
1002 }
1003
1004 // Now make a pass over the debug information replacing any references
1005 // to the allocated object with "sobj"
1006 JVMState *jvms = sfpt->jvms();
1007 sfpt->replace_edges_in_range(res, sobj, jvms->debug_start(), jvms->debug_end(), &_igvn);
1008 non_debug_edges_worklist.remove_edge_if_present(res); // drop scalarized input from non-debug info
1009 sfpt->restore_non_debug_edges(non_debug_edges_worklist);
1010 _igvn._worklist.push(sfpt);
1011
1012 // keep it for rollback
1013 safepoints_done.append_if_missing(sfpt);
1014 }
1015
1016 return true;
1017 }
1018
1019 static void disconnect_projections(MultiNode* n, PhaseIterGVN& igvn) {
1020 Node* ctl_proj = n->proj_out_or_null(TypeFunc::Control);
1021 Node* mem_proj = n->proj_out_or_null(TypeFunc::Memory);
1022 if (ctl_proj != nullptr) {
1023 igvn.replace_node(ctl_proj, n->in(0));
1024 }
1025 if (mem_proj != nullptr) {
1026 igvn.replace_node(mem_proj, n->in(TypeFunc::Memory));
1027 }
1028 }
1029
1030 // Process users of eliminated allocation.
1031 void PhaseMacroExpand::process_users_of_allocation(CallNode *alloc) {
1032 Node* res = alloc->result_cast();
1033 if (res != nullptr) {
1034 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) {
1035 Node *use = res->last_out(j);
1036 uint oc1 = res->outcnt();
1037
1038 if (use->is_AddP()) {
1039 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) {
1040 Node *n = use->last_out(k);
1041 uint oc2 = use->outcnt();
1042 if (n->is_Store()) {
1043 #ifdef ASSERT
1044 // Verify that there is no dependent MemBarVolatile nodes,
1045 // they should be removed during IGVN, see MemBarNode::Ideal().
1046 for (DUIterator_Fast pmax, p = n->fast_outs(pmax);
1047 p < pmax; p++) {
1048 Node* mb = n->fast_out(p);
1049 assert(mb->is_Initialize() || !mb->is_MemBar() ||
1050 mb->req() <= MemBarNode::Precedent ||
1051 mb->in(MemBarNode::Precedent) != n,
1052 "MemBarVolatile should be eliminated for non-escaping object");
1053 }
1054 #endif
1055 _igvn.replace_node(n, n->in(MemNode::Memory));
1056 } else {
1057 eliminate_gc_barrier(n);
1058 }
1059 k -= (oc2 - use->outcnt());
1060 }
1061 _igvn.remove_dead_node(use, PhaseIterGVN::NodeOrigin::Graph);
1062 } else if (use->is_ArrayCopy()) {
1063 // Disconnect ArrayCopy node
1064 ArrayCopyNode* ac = use->as_ArrayCopy();
1065 if (ac->is_clonebasic()) {
1066 Node* membar_after = ac->proj_out(TypeFunc::Control)->unique_ctrl_out();
1067 disconnect_projections(ac, _igvn);
1068 assert(alloc->in(TypeFunc::Memory)->is_Proj() && alloc->in(TypeFunc::Memory)->in(0)->Opcode() == Op_MemBarCPUOrder, "mem barrier expected before allocation");
1069 Node* membar_before = alloc->in(TypeFunc::Memory)->in(0);
1070 disconnect_projections(membar_before->as_MemBar(), _igvn);
1071 if (membar_after->is_MemBar()) {
1072 disconnect_projections(membar_after->as_MemBar(), _igvn);
1073 }
1074 } else {
1075 assert(ac->is_arraycopy_validated() ||
1076 ac->is_copyof_validated() ||
1077 ac->is_copyofrange_validated(), "unsupported");
1078 CallProjections callprojs;
1079 ac->extract_projections(&callprojs, true);
1080
1081 _igvn.replace_node(callprojs.fallthrough_ioproj, ac->in(TypeFunc::I_O));
1082 _igvn.replace_node(callprojs.fallthrough_memproj, ac->in(TypeFunc::Memory));
1083 _igvn.replace_node(callprojs.fallthrough_catchproj, ac->in(TypeFunc::Control));
1084
1085 // Set control to top. IGVN will remove the remaining projections
1086 ac->set_req(0, top());
1087 ac->replace_edge(res, top(), &_igvn);
1088
1089 // Disconnect src right away: it can help find new
1090 // opportunities for allocation elimination
1091 Node* src = ac->in(ArrayCopyNode::Src);
1092 ac->replace_edge(src, top(), &_igvn);
1093 // src can be top at this point if src and dest of the
1094 // arraycopy were the same
1095 if (src->outcnt() == 0 && !src->is_top()) {
1096 _igvn.remove_dead_node(src, PhaseIterGVN::NodeOrigin::Graph);
1097 }
1098 }
1099 _igvn._worklist.push(ac);
1100 } else if (use->is_ReachabilityFence() && OptimizeReachabilityFences) {
1101 use->as_ReachabilityFence()->clear_referent(_igvn); // redundant fence; will be removed during IGVN
1102 } else {
1103 eliminate_gc_barrier(use);
1104 }
1105 j -= (oc1 - res->outcnt());
1106 }
1107 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted");
1108 _igvn.remove_dead_node(res, PhaseIterGVN::NodeOrigin::Graph);
1109 }
1110
1111 //
1112 // Process other users of allocation's projections
1113 //
1114 if (_callprojs.resproj != nullptr && _callprojs.resproj->outcnt() != 0) {
1115 // First disconnect stores captured by Initialize node.
1116 // If Initialize node is eliminated first in the following code,
1117 // it will kill such stores and DUIterator_Last will assert.
1118 for (DUIterator_Fast jmax, j = _callprojs.resproj->fast_outs(jmax); j < jmax; j++) {
1119 Node* use = _callprojs.resproj->fast_out(j);
1120 if (use->is_AddP()) {
1121 // raw memory addresses used only by the initialization
1122 _igvn.replace_node(use, C->top());
1123 --j; --jmax;
1124 }
1125 }
1126 for (DUIterator_Last jmin, j = _callprojs.resproj->last_outs(jmin); j >= jmin; ) {
1127 Node* use = _callprojs.resproj->last_out(j);
1128 uint oc1 = _callprojs.resproj->outcnt();
1129 if (use->is_Initialize()) {
1130 // Eliminate Initialize node.
1131 InitializeNode *init = use->as_Initialize();
1132 Node *ctrl_proj = init->proj_out_or_null(TypeFunc::Control);
1133 if (ctrl_proj != nullptr) {
1134 _igvn.replace_node(ctrl_proj, init->in(TypeFunc::Control));
1135 #ifdef ASSERT
1136 // If the InitializeNode has no memory out, it will die, and tmp will become null
1137 Node* tmp = init->in(TypeFunc::Control);
1138 assert(tmp == nullptr || tmp == _callprojs.fallthrough_catchproj, "allocation control projection");
1139 #endif
1140 }
1141 Node* mem = init->in(TypeFunc::Memory);
1142 #ifdef ASSERT
1143 if (init->number_of_projs(TypeFunc::Memory) > 0) {
1144 if (mem->is_MergeMem()) {
1145 assert(mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw) == _callprojs.fallthrough_memproj, "allocation memory projection");
1146 } else {
1147 assert(mem == _callprojs.fallthrough_memproj, "allocation memory projection");
1148 }
1149 }
1150 #endif
1151 init->replace_mem_projs_by(mem, &_igvn);
1152 assert(init->outcnt() == 0, "should only have had a control and some memory projections, and we removed them");
1153 } else {
1154 assert(false, "only Initialize or AddP expected");
1155 }
1156 j -= (oc1 - _callprojs.resproj->outcnt());
1157 }
1158 }
1159 if (_callprojs.fallthrough_catchproj != nullptr) {
1160 _igvn.replace_node(_callprojs.fallthrough_catchproj, alloc->in(TypeFunc::Control));
1161 }
1162 if (_callprojs.fallthrough_memproj != nullptr) {
1163 _igvn.replace_node(_callprojs.fallthrough_memproj, alloc->in(TypeFunc::Memory));
1164 }
1165 if (_callprojs.catchall_memproj != nullptr) {
1166 _igvn.replace_node(_callprojs.catchall_memproj, C->top());
1167 }
1168 if (_callprojs.fallthrough_ioproj != nullptr) {
1169 _igvn.replace_node(_callprojs.fallthrough_ioproj, alloc->in(TypeFunc::I_O));
1170 }
1171 if (_callprojs.catchall_ioproj != nullptr) {
1172 _igvn.replace_node(_callprojs.catchall_ioproj, C->top());
1173 }
1174 if (_callprojs.catchall_catchproj != nullptr) {
1175 _igvn.replace_node(_callprojs.catchall_catchproj, C->top());
1176 }
1177 }
1178
1179 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) {
1180 // If reallocation fails during deoptimization we'll pop all
1181 // interpreter frames for this compiled frame and that won't play
1182 // nice with JVMTI popframe.
1183 // We avoid this issue by eager reallocation when the popframe request
1184 // is received.
1185 if (!EliminateAllocations || !alloc->_is_non_escaping) {
1186 return false;
1187 }
1188 Node* klass = alloc->in(AllocateNode::KlassNode);
1189 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr();
1190 Node* res = alloc->result_cast();
1191 // Eliminate boxing allocations which are not used
1192 // regardless scalar replaceable status.
1193 bool boxing_alloc = C->eliminate_boxing() &&
1194 tklass->isa_instklassptr() &&
1195 tklass->is_instklassptr()->instance_klass()->is_box_klass();
1196 if (!alloc->_is_scalar_replaceable && (!boxing_alloc || (res != nullptr))) {
1197 return false;
1198 }
1199
1200 alloc->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1201
1202 GrowableArray <SafePointNode *> safepoints;
1203 if (!can_eliminate_allocation(&_igvn, alloc, &safepoints)) {
1204 return false;
1205 }
1206
1207 if (!alloc->_is_scalar_replaceable) {
1208 assert(res == nullptr, "sanity");
1209 // We can only eliminate allocation if all debug info references
1210 // are already replaced with SafePointScalarObject because
1211 // we can't search for a fields value without instance_id.
1212 if (safepoints.length() > 0) {
1213 return false;
1214 }
1215 }
1216
1217 if (!scalar_replacement(alloc, safepoints)) {
1218 return false;
1219 }
1220
1221 CompileLog* log = C->log();
1222 if (log != nullptr) {
1223 log->head("eliminate_allocation type='%d'",
1224 log->identify(tklass->exact_klass()));
1225 JVMState* p = alloc->jvms();
1226 while (p != nullptr) {
1227 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1228 p = p->caller();
1229 }
1230 log->tail("eliminate_allocation");
1231 }
1232
1233 process_users_of_allocation(alloc);
1234
1235 #ifndef PRODUCT
1236 if (PrintEliminateAllocations) {
1237 if (alloc->is_AllocateArray())
1238 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1239 else
1240 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1241 }
1242 #endif
1243
1244 return true;
1245 }
1246
1247 bool PhaseMacroExpand::eliminate_boxing_node(CallStaticJavaNode *boxing) {
1248 // EA should remove all uses of non-escaping boxing node.
1249 if (!C->eliminate_boxing() || boxing->proj_out_or_null(TypeFunc::Parms) != nullptr) {
1250 return false;
1251 }
1252
1253 assert(boxing->result_cast() == nullptr, "unexpected boxing node result");
1254
1255 boxing->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1256
1257 const TypeTuple* r = boxing->tf()->range();
1258 assert(r->cnt() > TypeFunc::Parms, "sanity");
1259 const TypeInstPtr* t = r->field_at(TypeFunc::Parms)->isa_instptr();
1260 assert(t != nullptr, "sanity");
1261
1262 CompileLog* log = C->log();
1263 if (log != nullptr) {
1264 log->head("eliminate_boxing type='%d'",
1265 log->identify(t->instance_klass()));
1266 JVMState* p = boxing->jvms();
1267 while (p != nullptr) {
1268 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1269 p = p->caller();
1270 }
1271 log->tail("eliminate_boxing");
1272 }
1273
1274 process_users_of_allocation(boxing);
1275
1276 #ifndef PRODUCT
1277 if (PrintEliminateAllocations) {
1341 // oop flavor.
1342 //
1343 //=============================================================================
1344 // FastAllocateSizeLimit value is in DOUBLEWORDS.
1345 // Allocations bigger than this always go the slow route.
1346 // This value must be small enough that allocation attempts that need to
1347 // trigger exceptions go the slow route. Also, it must be small enough so
1348 // that heap_top + size_in_bytes does not wrap around the 4Gig limit.
1349 //=============================================================================j//
1350 // %%% Here is an old comment from parseHelper.cpp; is it outdated?
1351 // The allocator will coalesce int->oop copies away. See comment in
1352 // coalesce.cpp about how this works. It depends critically on the exact
1353 // code shape produced here, so if you are changing this code shape
1354 // make sure the GC info for the heap-top is correct in and around the
1355 // slow-path call.
1356 //
1357
1358 void PhaseMacroExpand::expand_allocate_common(
1359 AllocateNode* alloc, // allocation node to be expanded
1360 Node* length, // array length for an array allocation
1361 const TypeFunc* slow_call_type, // Type of slow call
1362 address slow_call_address, // Address of slow call
1363 Node* valid_length_test // whether length is valid or not
1364 )
1365 {
1366 Node* ctrl = alloc->in(TypeFunc::Control);
1367 Node* mem = alloc->in(TypeFunc::Memory);
1368 Node* i_o = alloc->in(TypeFunc::I_O);
1369 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize);
1370 Node* klass_node = alloc->in(AllocateNode::KlassNode);
1371 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest);
1372 assert(ctrl != nullptr, "must have control");
1373
1374 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results.
1375 // they will not be used if "always_slow" is set
1376 enum { slow_result_path = 1, fast_result_path = 2 };
1377 Node *result_region = nullptr;
1378 Node *result_phi_rawmem = nullptr;
1379 Node *result_phi_rawoop = nullptr;
1380 Node *result_phi_i_o = nullptr;
1425 #endif
1426 yank_alloc_node(alloc);
1427 return;
1428 }
1429 }
1430
1431 enum { too_big_or_final_path = 1, need_gc_path = 2 };
1432 Node *slow_region = nullptr;
1433 Node *toobig_false = ctrl;
1434
1435 // generate the initial test if necessary
1436 if (initial_slow_test != nullptr ) {
1437 assert (expand_fast_path, "Only need test if there is a fast path");
1438 slow_region = new RegionNode(3);
1439
1440 // Now make the initial failure test. Usually a too-big test but
1441 // might be a TRUE for finalizers.
1442 IfNode *toobig_iff = new IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN);
1443 transform_later(toobig_iff);
1444 // Plug the failing-too-big test into the slow-path region
1445 Node *toobig_true = new IfTrueNode( toobig_iff );
1446 transform_later(toobig_true);
1447 slow_region ->init_req( too_big_or_final_path, toobig_true );
1448 toobig_false = new IfFalseNode( toobig_iff );
1449 transform_later(toobig_false);
1450 } else {
1451 // No initial test, just fall into next case
1452 assert(allocation_has_use || !expand_fast_path, "Should already have been handled");
1453 toobig_false = ctrl;
1454 DEBUG_ONLY(slow_region = NodeSentinel);
1455 }
1456
1457 // If we are here there are several possibilities
1458 // - expand_fast_path is false - then only a slow path is expanded. That's it.
1459 // no_initial_check means a constant allocation.
1460 // - If check always evaluates to false -> expand_fast_path is false (see above)
1461 // - If check always evaluates to true -> directly into fast path (but may bailout to slowpath)
1462 // if !allocation_has_use the fast path is empty
1463 // if !allocation_has_use && no_initial_check
1464 // - Then there are no fastpath that can fall out to slowpath -> no allocation code at all.
1465 // removed by yank_alloc_node above.
1466
1467 Node *slow_mem = mem; // save the current memory state for slow path
1468 // generate the fast allocation code unless we know that the initial test will always go slow
1469 if (expand_fast_path) {
1470 // Fast path modifies only raw memory.
1471 if (mem->is_MergeMem()) {
1472 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
1473 }
1474
1475 // allocate the Region and Phi nodes for the result
1476 result_region = new RegionNode(3);
1477 result_phi_rawmem = new PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM);
1478 result_phi_i_o = new PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch
1479
1480 // Grab regular I/O before optional prefetch may change it.
1481 // Slow-path does no I/O so just set it to the original I/O.
1482 result_phi_i_o->init_req(slow_result_path, i_o);
1483
1484 // Name successful fast-path variables
1485 Node* fast_oop_ctrl;
1486 Node* fast_oop_rawmem;
1487 if (allocation_has_use) {
1488 Node* needgc_ctrl = nullptr;
1489 result_phi_rawoop = new PhiNode(result_region, TypeRawPtr::BOTTOM);
1490
1491 intx prefetch_lines = length != nullptr ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
1492 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1493 Node* fast_oop = bs->obj_allocate(this, mem, toobig_false, size_in_bytes, i_o, needgc_ctrl,
1494 fast_oop_ctrl, fast_oop_rawmem,
1495 prefetch_lines);
1496
1497 if (initial_slow_test != nullptr) {
1498 // This completes all paths into the slow merge point
1499 slow_region->init_req(need_gc_path, needgc_ctrl);
1500 transform_later(slow_region);
1501 } else {
1502 // No initial slow path needed!
1503 // Just fall from the need-GC path straight into the VM call.
1504 slow_region = needgc_ctrl;
1505 }
1506
1524 result_phi_i_o ->init_req(fast_result_path, i_o);
1525 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem);
1526 } else {
1527 slow_region = ctrl;
1528 result_phi_i_o = i_o; // Rename it to use in the following code.
1529 }
1530
1531 // Generate slow-path call
1532 CallNode *call = new CallStaticJavaNode(slow_call_type, slow_call_address,
1533 OptoRuntime::stub_name(slow_call_address),
1534 TypePtr::BOTTOM);
1535 call->init_req(TypeFunc::Control, slow_region);
1536 call->init_req(TypeFunc::I_O, top()); // does no i/o
1537 call->init_req(TypeFunc::Memory, slow_mem); // may gc ptrs
1538 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1539 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1540
1541 call->init_req(TypeFunc::Parms+0, klass_node);
1542 if (length != nullptr) {
1543 call->init_req(TypeFunc::Parms+1, length);
1544 }
1545
1546 // Copy debug information and adjust JVMState information, then replace
1547 // allocate node with the call
1548 call->copy_call_debug_info(&_igvn, alloc);
1549 // For array allocations, copy the valid length check to the call node so Compile::final_graph_reshaping() can verify
1550 // that the call has the expected number of CatchProj nodes (in case the allocation always fails and the fallthrough
1551 // path dies).
1552 if (valid_length_test != nullptr) {
1553 call->add_req(valid_length_test);
1554 }
1555 if (expand_fast_path) {
1556 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
1557 } else {
1558 // Hook i_o projection to avoid its elimination during allocation
1559 // replacement (when only a slow call is generated).
1560 call->set_req(TypeFunc::I_O, result_phi_i_o);
1561 }
1562 _igvn.replace_node(alloc, call);
1563 transform_later(call);
1564
1565 // Identify the output projections from the allocate node and
1566 // adjust any references to them.
1567 // The control and io projections look like:
1568 //
1569 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl)
1570 // Allocate Catch
1571 // ^---Proj(io) <-------+ ^---CatchProj(io)
1572 //
1573 // We are interested in the CatchProj nodes.
1574 //
1575 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1576
1577 // An allocate node has separate memory projections for the uses on
1578 // the control and i_o paths. Replace the control memory projection with
1579 // result_phi_rawmem (unless we are only generating a slow call when
1580 // both memory projections are combined)
1581 if (expand_fast_path && _callprojs.fallthrough_memproj != nullptr) {
1582 migrate_outs(_callprojs.fallthrough_memproj, result_phi_rawmem);
1583 }
1584 // Now change uses of catchall_memproj to use fallthrough_memproj and delete
1585 // catchall_memproj so we end up with a call that has only 1 memory projection.
1586 if (_callprojs.catchall_memproj != nullptr ) {
1587 if (_callprojs.fallthrough_memproj == nullptr) {
1588 _callprojs.fallthrough_memproj = new ProjNode(call, TypeFunc::Memory);
1589 transform_later(_callprojs.fallthrough_memproj);
1590 }
1591 migrate_outs(_callprojs.catchall_memproj, _callprojs.fallthrough_memproj);
1592 _igvn.remove_dead_node(_callprojs.catchall_memproj, PhaseIterGVN::NodeOrigin::Graph);
1593 }
1594
1595 // An allocate node has separate i_o projections for the uses on the control
1596 // and i_o paths. Always replace the control i_o projection with result i_o
1597 // otherwise incoming i_o become dead when only a slow call is generated
1598 // (it is different from memory projections where both projections are
1599 // combined in such case).
1600 if (_callprojs.fallthrough_ioproj != nullptr) {
1601 migrate_outs(_callprojs.fallthrough_ioproj, result_phi_i_o);
1602 }
1603 // Now change uses of catchall_ioproj to use fallthrough_ioproj and delete
1604 // catchall_ioproj so we end up with a call that has only 1 i_o projection.
1605 if (_callprojs.catchall_ioproj != nullptr ) {
1606 if (_callprojs.fallthrough_ioproj == nullptr) {
1607 _callprojs.fallthrough_ioproj = new ProjNode(call, TypeFunc::I_O);
1608 transform_later(_callprojs.fallthrough_ioproj);
1609 }
1610 migrate_outs(_callprojs.catchall_ioproj, _callprojs.fallthrough_ioproj);
1611 _igvn.remove_dead_node(_callprojs.catchall_ioproj, PhaseIterGVN::NodeOrigin::Graph);
1612 }
1613
1614 // if we generated only a slow call, we are done
1615 if (!expand_fast_path) {
1616 // Now we can unhook i_o.
1617 if (result_phi_i_o->outcnt() > 1) {
1618 call->set_req(TypeFunc::I_O, top());
1619 } else {
1620 assert(result_phi_i_o->unique_ctrl_out() == call, "sanity");
1621 // Case of new array with negative size known during compilation.
1622 // AllocateArrayNode::Ideal() optimization disconnect unreachable
1623 // following code since call to runtime will throw exception.
1624 // As result there will be no users of i_o after the call.
1625 // Leave i_o attached to this call to avoid problems in preceding graph.
1626 }
1627 return;
1628 }
1629
1630 if (_callprojs.fallthrough_catchproj != nullptr) {
1631 ctrl = _callprojs.fallthrough_catchproj->clone();
1632 transform_later(ctrl);
1633 _igvn.replace_node(_callprojs.fallthrough_catchproj, result_region);
1634 } else {
1635 ctrl = top();
1636 }
1637 Node *slow_result;
1638 if (_callprojs.resproj == nullptr) {
1639 // no uses of the allocation result
1640 slow_result = top();
1641 } else {
1642 slow_result = _callprojs.resproj->clone();
1643 transform_later(slow_result);
1644 _igvn.replace_node(_callprojs.resproj, result_phi_rawoop);
1645 }
1646
1647 // Plug slow-path into result merge point
1648 result_region->init_req( slow_result_path, ctrl);
1649 transform_later(result_region);
1650 if (allocation_has_use) {
1651 result_phi_rawoop->init_req(slow_result_path, slow_result);
1652 transform_later(result_phi_rawoop);
1653 }
1654 result_phi_rawmem->init_req(slow_result_path, _callprojs.fallthrough_memproj);
1655 transform_later(result_phi_rawmem);
1656 transform_later(result_phi_i_o);
1657 // This completes all paths into the result merge point
1658 }
1659
1660 // Remove alloc node that has no uses.
1661 void PhaseMacroExpand::yank_alloc_node(AllocateNode* alloc) {
1662 Node* ctrl = alloc->in(TypeFunc::Control);
1663 Node* mem = alloc->in(TypeFunc::Memory);
1664 Node* i_o = alloc->in(TypeFunc::I_O);
1665
1666 alloc->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1667 if (_callprojs.resproj != nullptr) {
1668 for (DUIterator_Fast imax, i = _callprojs.resproj->fast_outs(imax); i < imax; i++) {
1669 Node* use = _callprojs.resproj->fast_out(i);
1670 use->isa_MemBar()->remove(&_igvn);
1671 --imax;
1672 --i; // back up iterator
1673 }
1674 assert(_callprojs.resproj->outcnt() == 0, "all uses must be deleted");
1675 _igvn.remove_dead_node(_callprojs.resproj, PhaseIterGVN::NodeOrigin::Graph);
1676 }
1677 if (_callprojs.fallthrough_catchproj != nullptr) {
1678 migrate_outs(_callprojs.fallthrough_catchproj, ctrl);
1679 _igvn.remove_dead_node(_callprojs.fallthrough_catchproj, PhaseIterGVN::NodeOrigin::Graph);
1680 }
1681 if (_callprojs.catchall_catchproj != nullptr) {
1682 _igvn.rehash_node_delayed(_callprojs.catchall_catchproj);
1683 _callprojs.catchall_catchproj->set_req(0, top());
1684 }
1685 if (_callprojs.fallthrough_proj != nullptr) {
1686 Node* catchnode = _callprojs.fallthrough_proj->unique_ctrl_out();
1687 _igvn.remove_dead_node(catchnode, PhaseIterGVN::NodeOrigin::Graph);
1688 _igvn.remove_dead_node(_callprojs.fallthrough_proj, PhaseIterGVN::NodeOrigin::Graph);
1689 }
1690 if (_callprojs.fallthrough_memproj != nullptr) {
1691 migrate_outs(_callprojs.fallthrough_memproj, mem);
1692 _igvn.remove_dead_node(_callprojs.fallthrough_memproj, PhaseIterGVN::NodeOrigin::Graph);
1693 }
1694 if (_callprojs.fallthrough_ioproj != nullptr) {
1695 migrate_outs(_callprojs.fallthrough_ioproj, i_o);
1696 _igvn.remove_dead_node(_callprojs.fallthrough_ioproj, PhaseIterGVN::NodeOrigin::Graph);
1697 }
1698 if (_callprojs.catchall_memproj != nullptr) {
1699 _igvn.rehash_node_delayed(_callprojs.catchall_memproj);
1700 _callprojs.catchall_memproj->set_req(0, top());
1701 }
1702 if (_callprojs.catchall_ioproj != nullptr) {
1703 _igvn.rehash_node_delayed(_callprojs.catchall_ioproj);
1704 _callprojs.catchall_ioproj->set_req(0, top());
1705 }
1706 #ifndef PRODUCT
1707 if (PrintEliminateAllocations) {
1708 if (alloc->is_AllocateArray()) {
1709 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1710 } else {
1711 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1712 }
1713 }
1714 #endif
1715 _igvn.remove_dead_node(alloc, PhaseIterGVN::NodeOrigin::Graph);
1716 }
1717
1718 void PhaseMacroExpand::expand_initialize_membar(AllocateNode* alloc, InitializeNode* init,
1719 Node*& fast_oop_ctrl, Node*& fast_oop_rawmem) {
1720 // If initialization is performed by an array copy, any required
1721 // MemBarStoreStore was already added. If the object does not
1722 // escape no need for a MemBarStoreStore. If the object does not
1723 // escape in its initializer and memory barrier (MemBarStoreStore or
1724 // stronger) is already added at exit of initializer, also no need
1818 Node* thread = new ThreadLocalNode();
1819 transform_later(thread);
1820
1821 call->init_req(TypeFunc::Parms + 0, thread);
1822 call->init_req(TypeFunc::Parms + 1, oop);
1823 call->init_req(TypeFunc::Control, ctrl);
1824 call->init_req(TypeFunc::I_O , top()); // does no i/o
1825 call->init_req(TypeFunc::Memory , rawmem);
1826 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1827 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1828 transform_later(call);
1829 ctrl = new ProjNode(call, TypeFunc::Control);
1830 transform_later(ctrl);
1831 rawmem = new ProjNode(call, TypeFunc::Memory);
1832 transform_later(rawmem);
1833 }
1834 }
1835
1836 // Helper for PhaseMacroExpand::expand_allocate_common.
1837 // Initializes the newly-allocated storage.
1838 Node*
1839 PhaseMacroExpand::initialize_object(AllocateNode* alloc,
1840 Node* control, Node* rawmem, Node* object,
1841 Node* klass_node, Node* length,
1842 Node* size_in_bytes) {
1843 InitializeNode* init = alloc->initialization();
1844 // Store the klass & mark bits
1845 Node* mark_node = alloc->make_ideal_mark(&_igvn, control, rawmem);
1846 if (!mark_node->is_Con()) {
1847 transform_later(mark_node);
1848 }
1849 rawmem = make_store_raw(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, TypeX_X->basic_type());
1850
1851 if (!UseCompactObjectHeaders) {
1852 rawmem = make_store_raw(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
1853 }
1854 int header_size = alloc->minimum_header_size(); // conservatively small
1855
1856 // Array length
1857 if (length != nullptr) { // Arrays need length field
1858 rawmem = make_store_raw(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
1859 // conservatively small header size:
1860 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1861 if (_igvn.type(klass_node)->isa_aryklassptr()) { // we know the exact header size in most cases:
1862 BasicType elem = _igvn.type(klass_node)->is_klassptr()->as_instance_type()->isa_aryptr()->elem()->array_element_basic_type();
1863 if (is_reference_type(elem, true)) {
1864 elem = T_OBJECT;
1865 }
1866 header_size = Klass::layout_helper_header_size(Klass::array_layout_helper(elem));
1867 }
1868 }
1869
1870 // Clear the object body, if necessary.
1871 if (init == nullptr) {
1872 // The init has somehow disappeared; be cautious and clear everything.
1873 //
1874 // This can happen if a node is allocated but an uncommon trap occurs
1875 // immediately. In this case, the Initialize gets associated with the
1876 // trap, and may be placed in a different (outer) loop, if the Allocate
1877 // is in a loop. If (this is rare) the inner loop gets unrolled, then
1878 // there can be two Allocates to one Initialize. The answer in all these
1879 // edge cases is safety first. It is always safe to clear immediately
1880 // within an Allocate, and then (maybe or maybe not) clear some more later.
1881 if (!(UseTLAB && ZeroTLAB)) {
1882 rawmem = ClearArrayNode::clear_memory(control, rawmem, object,
1883 header_size, size_in_bytes,
1884 true,
1885 &_igvn);
1886 }
1887 } else {
1888 if (!init->is_complete()) {
1889 // Try to win by zeroing only what the init does not store.
1890 // We can also try to do some peephole optimizations,
1891 // such as combining some adjacent subword stores.
1892 rawmem = init->complete_stores(control, rawmem, object,
1893 header_size, size_in_bytes, &_igvn);
1894 }
1895 // We have no more use for this link, since the AllocateNode goes away:
1896 init->set_req(InitializeNode::RawAddress, top());
1897 // (If we keep the link, it just confuses the register allocator,
1898 // who thinks he sees a real use of the address by the membar.)
1899 }
1900
1901 return rawmem;
1902 }
2037 for (intx i = 0; i < lines; i++) {
2038 prefetch_adr = AddPNode::make_off_heap(new_eden_top,
2039 _igvn.MakeConX(distance));
2040 transform_later(prefetch_adr);
2041 prefetch = new PrefetchAllocationNode(i_o, prefetch_adr);
2042 // Do not let it float too high, since if eden_top == eden_end,
2043 // both might be null.
2044 if (i == 0) { // Set control for first prefetch, next follows it
2045 prefetch->init_req(0, needgc_false);
2046 }
2047 transform_later(prefetch);
2048 distance += step_size;
2049 i_o = prefetch;
2050 }
2051 }
2052 return i_o;
2053 }
2054
2055
2056 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) {
2057 expand_allocate_common(alloc, nullptr,
2058 OptoRuntime::new_instance_Type(),
2059 OptoRuntime::new_instance_Java(), nullptr);
2060 }
2061
2062 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) {
2063 Node* length = alloc->in(AllocateNode::ALength);
2064 Node* valid_length_test = alloc->in(AllocateNode::ValidLengthTest);
2065 InitializeNode* init = alloc->initialization();
2066 Node* klass_node = alloc->in(AllocateNode::KlassNode);
2067 const TypeAryKlassPtr* ary_klass_t = _igvn.type(klass_node)->isa_aryklassptr();
2068 address slow_call_address; // Address of slow call
2069 if (init != nullptr && init->is_complete_with_arraycopy() &&
2070 ary_klass_t && ary_klass_t->elem()->isa_klassptr() == nullptr) {
2071 // Don't zero type array during slow allocation in VM since
2072 // it will be initialized later by arraycopy in compiled code.
2073 slow_call_address = OptoRuntime::new_array_nozero_Java();
2074 } else {
2075 slow_call_address = OptoRuntime::new_array_Java();
2076 }
2077 expand_allocate_common(alloc, length,
2078 OptoRuntime::new_array_Type(),
2079 slow_call_address, valid_length_test);
2080 }
2081
2082 //-------------------mark_eliminated_box----------------------------------
2083 //
2084 // During EA obj may point to several objects but after few ideal graph
2085 // transformations (CCP) it may point to only one non escaping object
2086 // (but still using phi), corresponding locks and unlocks will be marked
2087 // for elimination. Later obj could be replaced with a new node (new phi)
2088 // and which does not have escape information. And later after some graph
2089 // reshape other locks and unlocks (which were not marked for elimination
2090 // before) are connected to this new obj (phi) but they still will not be
2091 // marked for elimination since new obj has no escape information.
2092 // Mark all associated (same box and obj) lock and unlock nodes for
2093 // elimination if some of them marked already.
2094 void PhaseMacroExpand::mark_eliminated_box(Node* box, Node* obj) {
2095 BoxLockNode* oldbox = box->as_BoxLock();
2096 if (oldbox->is_eliminated()) {
2097 return; // This BoxLock node was processed already.
2098 }
2270 #ifdef ASSERT
2271 if (!alock->is_coarsened()) {
2272 // Check that new "eliminated" BoxLock node is created.
2273 BoxLockNode* oldbox = alock->box_node()->as_BoxLock();
2274 assert(oldbox->is_eliminated(), "should be done already");
2275 }
2276 #endif
2277
2278 alock->log_lock_optimization(C, "eliminate_lock");
2279
2280 #ifndef PRODUCT
2281 if (PrintEliminateLocks) {
2282 tty->print_cr("++++ Eliminated: %d %s '%s'", alock->_idx, (alock->is_Lock() ? "Lock" : "Unlock"), alock->kind_as_string());
2283 }
2284 #endif
2285
2286 Node* mem = alock->in(TypeFunc::Memory);
2287 Node* ctrl = alock->in(TypeFunc::Control);
2288 guarantee(ctrl != nullptr, "missing control projection, cannot replace_node() with null");
2289
2290 alock->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2291 // There are 2 projections from the lock. The lock node will
2292 // be deleted when its last use is subsumed below.
2293 assert(alock->outcnt() == 2 &&
2294 _callprojs.fallthrough_proj != nullptr &&
2295 _callprojs.fallthrough_memproj != nullptr,
2296 "Unexpected projections from Lock/Unlock");
2297
2298 Node* fallthroughproj = _callprojs.fallthrough_proj;
2299 Node* memproj_fallthrough = _callprojs.fallthrough_memproj;
2300
2301 // The memory projection from a lock/unlock is RawMem
2302 // The input to a Lock is merged memory, so extract its RawMem input
2303 // (unless the MergeMem has been optimized away.)
2304 if (alock->is_Lock()) {
2305 // Search for MemBarAcquireLock node and delete it also.
2306 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar();
2307 assert(membar != nullptr && membar->Opcode() == Op_MemBarAcquireLock, "");
2308 Node* ctrlproj = membar->proj_out(TypeFunc::Control);
2309 Node* memproj = membar->proj_out(TypeFunc::Memory);
2310 _igvn.replace_node(ctrlproj, fallthroughproj);
2311 _igvn.replace_node(memproj, memproj_fallthrough);
2312
2313 // Delete FastLock node also if this Lock node is unique user
2314 // (a loop peeling may clone a Lock node).
2315 Node* flock = alock->as_Lock()->fastlock_node();
2316 if (flock->outcnt() == 1) {
2317 assert(flock->unique_out() == alock, "sanity");
2318 _igvn.replace_node(flock, top());
2319 }
2350 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2351
2352 // Make the merge point
2353 Node *region;
2354 Node *mem_phi;
2355 Node *slow_path;
2356
2357 region = new RegionNode(3);
2358 // create a Phi for the memory state
2359 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2360
2361 // Optimize test; set region slot 2
2362 slow_path = opt_bits_test(ctrl, region, 2, flock);
2363 mem_phi->init_req(2, mem);
2364
2365 // Make slow path call
2366 CallNode* call = make_slow_call(lock, OptoRuntime::complete_monitor_enter_Type(),
2367 OptoRuntime::complete_monitor_locking_Java(), nullptr, slow_path,
2368 obj, box, nullptr);
2369
2370 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2371
2372 // Slow path can only throw asynchronous exceptions, which are always
2373 // de-opted. So the compiler thinks the slow-call can never throw an
2374 // exception. If it DOES throw an exception we would need the debug
2375 // info removed first (since if it throws there is no monitor).
2376 assert(_callprojs.fallthrough_ioproj == nullptr && _callprojs.catchall_ioproj == nullptr &&
2377 _callprojs.catchall_memproj == nullptr && _callprojs.catchall_catchproj == nullptr, "Unexpected projection from Lock");
2378
2379 // Capture slow path
2380 // disconnect fall-through projection from call and create a new one
2381 // hook up users of fall-through projection to region
2382 Node *slow_ctrl = _callprojs.fallthrough_proj->clone();
2383 transform_later(slow_ctrl);
2384 _igvn.hash_delete(_callprojs.fallthrough_proj);
2385 _callprojs.fallthrough_proj->disconnect_inputs(C);
2386 region->init_req(1, slow_ctrl);
2387 // region inputs are now complete
2388 transform_later(region);
2389 _igvn.replace_node(_callprojs.fallthrough_proj, region);
2390
2391 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2392
2393 mem_phi->init_req(1, memproj);
2394
2395 transform_later(mem_phi);
2396
2397 _igvn.replace_node(_callprojs.fallthrough_memproj, mem_phi);
2398 }
2399
2400 //------------------------------expand_unlock_node----------------------
2401 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {
2402
2403 Node* ctrl = unlock->in(TypeFunc::Control);
2404 Node* mem = unlock->in(TypeFunc::Memory);
2405 Node* obj = unlock->obj_node();
2406 Node* box = unlock->box_node();
2407
2408 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2409
2410 // No need for a null check on unlock
2411
2412 // Make the merge point
2413 Node* region = new RegionNode(3);
2414
2415 FastUnlockNode *funlock = new FastUnlockNode( ctrl, obj, box );
2416 funlock = transform_later( funlock )->as_FastUnlock();
2417 // Optimize test; set region slot 2
2418 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock);
2419 Node *thread = transform_later(new ThreadLocalNode());
2420
2421 CallNode *call = make_slow_call((CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(),
2422 CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C),
2423 "complete_monitor_unlocking_C", slow_path, obj, box, thread);
2424
2425 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2426 assert(_callprojs.fallthrough_ioproj == nullptr && _callprojs.catchall_ioproj == nullptr &&
2427 _callprojs.catchall_memproj == nullptr && _callprojs.catchall_catchproj == nullptr, "Unexpected projection from Lock");
2428
2429 // No exceptions for unlocking
2430 // Capture slow path
2431 // disconnect fall-through projection from call and create a new one
2432 // hook up users of fall-through projection to region
2433 Node *slow_ctrl = _callprojs.fallthrough_proj->clone();
2434 transform_later(slow_ctrl);
2435 _igvn.hash_delete(_callprojs.fallthrough_proj);
2436 _callprojs.fallthrough_proj->disconnect_inputs(C);
2437 region->init_req(1, slow_ctrl);
2438 // region inputs are now complete
2439 transform_later(region);
2440 _igvn.replace_node(_callprojs.fallthrough_proj, region);
2441
2442 if (_callprojs.fallthrough_memproj != nullptr) {
2443 // create a Phi for the memory state
2444 Node* mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2445 Node* memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2446 mem_phi->init_req(1, memproj);
2447 mem_phi->init_req(2, mem);
2448 transform_later(mem_phi);
2449 _igvn.replace_node(_callprojs.fallthrough_memproj, mem_phi);
2450 }
2451 }
2452
2453 void PhaseMacroExpand::expand_subtypecheck_node(SubTypeCheckNode *check) {
2454 assert(check->in(SubTypeCheckNode::Control) == nullptr, "should be pinned");
2455 Node* bol = check->unique_out();
2456 Node* obj_or_subklass = check->in(SubTypeCheckNode::ObjOrSubKlass);
2457 Node* superklass = check->in(SubTypeCheckNode::SuperKlass);
2458 assert(bol->is_Bool() && bol->as_Bool()->_test._test == BoolTest::ne, "unexpected bool node");
2459
2460 for (DUIterator_Last imin, i = bol->last_outs(imin); i >= imin; --i) {
2461 Node* iff = bol->last_out(i);
2462 assert(iff->is_If(), "where's the if?");
2463
2464 if (iff->in(0)->is_top()) {
2465 _igvn.replace_input_of(iff, 1, C->top());
2466 continue;
2467 }
2468
2469 IfTrueNode* iftrue = iff->as_If()->true_proj();
2470 IfFalseNode* iffalse = iff->as_If()->false_proj();
2471 Node* ctrl = iff->in(0);
2472
2473 Node* subklass = nullptr;
2474 if (_igvn.type(obj_or_subklass)->isa_klassptr()) {
2475 subklass = obj_or_subklass;
2476 } else {
2477 Node* k_adr = basic_plus_adr(obj_or_subklass, oopDesc::klass_offset_in_bytes());
2478 subklass = _igvn.transform(LoadKlassNode::make(_igvn, C->immutable_memory(), k_adr, TypeInstPtr::KLASS));
2479 }
2480
2481 Node* not_subtype_ctrl = Phase::gen_subtype_check(subklass, superklass, &ctrl, nullptr, _igvn, check->method(), check->bci());
2482
2483 _igvn.replace_input_of(iff, 0, C->top());
2484 _igvn.replace_node(iftrue, not_subtype_ctrl);
2485 _igvn.replace_node(iffalse, ctrl);
2486 }
2487 _igvn.replace_node(check, C->top());
2488 }
2489
2490 // Perform refining of strip mined loop nodes in the macro nodes list.
2491 void PhaseMacroExpand::refine_strip_mined_loop_macro_nodes() {
2492 for (int i = C->macro_count(); i > 0; i--) {
2493 Node* n = C->macro_node(i - 1);
2494 if (n->is_OuterStripMinedLoop()) {
2495 n->as_OuterStripMinedLoop()->adjust_strip_mined_loop(&_igvn);
2496 }
2497 }
2498 }
2499
2500 //---------------------------eliminate_macro_nodes----------------------
2501 // Eliminate scalar replaced allocations and associated locks.
2502 void PhaseMacroExpand::eliminate_macro_nodes() {
2503 if (C->macro_count() == 0)
2504 return;
2505
2506 if (StressMacroElimination) {
2507 C->shuffle_macro_nodes();
2508 }
2509 NOT_PRODUCT(int membar_before = count_MemBar(C);)
2510
2511 // Before elimination may re-mark (change to Nested or NonEscObj)
2512 // all associated (same box and obj) lock and unlock nodes.
2513 int cnt = C->macro_count();
2514 for (int i=0; i < cnt; i++) {
2515 Node *n = C->macro_node(i);
2516 if (n->is_AbstractLock()) { // Lock and Unlock nodes
2517 mark_eliminated_locking_nodes(n->as_AbstractLock());
2518 }
2519 }
2520 // Re-marking may break consistency of Coarsened locks.
2521 if (!C->coarsened_locks_consistent()) {
2522 return; // recompile without Coarsened locks if broken
2523 } else {
2524 // After coarsened locks are eliminated locking regions
2525 // become unbalanced. We should not execute any more
2526 // locks elimination optimizations on them.
2527 C->mark_unbalanced_boxes();
2528 }
2529
2530 // First, attempt to eliminate locks
2531 bool progress = true;
2532 while (progress) {
2533 progress = false;
2534 for (int i = C->macro_count(); i > 0; i = MIN2(i - 1, C->macro_count())) { // more than 1 element can be eliminated at once
2535 Node* n = C->macro_node(i - 1);
2536 bool success = false;
2537 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2538 if (n->is_AbstractLock()) {
2539 success = eliminate_locking_node(n->as_AbstractLock());
2540 #ifndef PRODUCT
2541 if (success && PrintOptoStatistics) {
2542 AtomicAccess::inc(&PhaseMacroExpand::_monitor_objects_removed_counter);
2543 }
2544 #endif
2545 }
2546 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2547 progress = progress || success;
2548 if (success) {
2549 C->print_method(PHASE_AFTER_MACRO_ELIMINATION_STEP, 5, n);
2550 }
2551 }
2552 }
2553 // Next, attempt to eliminate allocations
2554 progress = true;
2555 while (progress) {
2556 progress = false;
2557 for (int i = C->macro_count(); i > 0; i = MIN2(i - 1, C->macro_count())) { // more than 1 element can be eliminated at once
2558 Node* n = C->macro_node(i - 1);
2559 bool success = false;
2560 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2561 switch (n->class_id()) {
2562 case Node::Class_Allocate:
2563 case Node::Class_AllocateArray:
2564 success = eliminate_allocate_node(n->as_Allocate());
2565 #ifndef PRODUCT
2566 if (success && PrintOptoStatistics) {
2567 AtomicAccess::inc(&PhaseMacroExpand::_objs_scalar_replaced_counter);
2568 }
2569 #endif
2570 break;
2571 case Node::Class_CallStaticJava:
2572 success = eliminate_boxing_node(n->as_CallStaticJava());
2573 break;
2574 case Node::Class_Lock:
2575 case Node::Class_Unlock:
2576 assert(!n->as_AbstractLock()->is_eliminated(), "sanity");
2577 break;
2578 case Node::Class_ArrayCopy:
2579 break;
2580 case Node::Class_OuterStripMinedLoop:
2581 break;
2582 case Node::Class_SubTypeCheck:
2583 break;
2584 case Node::Class_Opaque1:
2585 break;
2586 default:
2587 assert(n->Opcode() == Op_LoopLimit ||
2588 n->Opcode() == Op_ModD ||
2589 n->Opcode() == Op_ModF ||
2590 n->Opcode() == Op_PowD ||
2591 n->is_OpaqueConstantBool() ||
2592 n->is_OpaqueInitializedAssertionPredicate() ||
2593 n->Opcode() == Op_MaxL ||
2594 n->Opcode() == Op_MinL ||
2595 BarrierSet::barrier_set()->barrier_set_c2()->is_gc_barrier_node(n),
2596 "unknown node type in macro list");
2597 }
2598 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2599 progress = progress || success;
2600 if (success) {
2601 C->print_method(PHASE_AFTER_MACRO_ELIMINATION_STEP, 5, n);
2602 }
2603 }
2604 }
2605 #ifndef PRODUCT
2606 if (PrintOptoStatistics) {
2607 int membar_after = count_MemBar(C);
2608 AtomicAccess::add(&PhaseMacroExpand::_memory_barriers_removed_counter, membar_before - membar_after);
2609 }
2610 #endif
2611 }
2612
2613 void PhaseMacroExpand::eliminate_opaque_looplimit_macro_nodes() {
2614 if (C->macro_count() == 0) {
2615 return;
2616 }
2617 refine_strip_mined_loop_macro_nodes();
2618 // Eliminate Opaque and LoopLimit nodes. Do it after all loop optimizations.
2619 bool progress = true;
2620 while (progress) {
2621 progress = false;
2622 for (int i = C->macro_count(); i > 0; i--) {
2623 Node* n = C->macro_node(i-1);
2624 bool success = false;
2625 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2626 if (n->Opcode() == Op_LoopLimit) {
2627 // Remove it from macro list and put on IGVN worklist to optimize.
2628 C->remove_macro_node(n);
2629 _igvn._worklist.push(n);
2630 success = true;
2631 } else if (n->Opcode() == Op_CallStaticJava) {
2632 // Remove it from macro list and put on IGVN worklist to optimize.
2633 C->remove_macro_node(n);
2634 _igvn._worklist.push(n);
2635 success = true;
2636 } else if (n->is_Opaque1()) {
2637 _igvn.replace_node(n, n->in(1));
2638 success = true;
2639 } else if (n->is_OpaqueConstantBool()) {
2640 // Tests with OpaqueConstantBool nodes are implicitly known. Replace the node with true/false. In debug builds,
2641 // we leave the test in the graph to have an additional sanity check at runtime. If the test fails (i.e. a bug),
2642 // we will execute a Halt node.
2643 #ifdef ASSERT
2644 _igvn.replace_node(n, n->in(1));
2645 #else
2646 _igvn.replace_node(n, _igvn.intcon(n->as_OpaqueConstantBool()->constant()));
2647 #endif
2648 success = true;
2649 } else if (n->is_OpaqueInitializedAssertionPredicate()) {
2650 // Initialized Assertion Predicates must always evaluate to true. Therefore, we get rid of them in product
2651 // builds as they are useless. In debug builds we keep them as additional verification code. Even though
2652 // loop opts are already over, we want to keep Initialized Assertion Predicates alive as long as possible to
2653 // enable folding of dead control paths within which cast nodes become top after due to impossible types -
2654 // even after loop opts are over. Therefore, we delay the removal of these opaque nodes until now.
2655 #ifdef ASSERT
2724 // Worst case is a macro node gets expanded into about 200 nodes.
2725 // Allow 50% more for optimization.
2726 if (C->check_node_count(300, "out of nodes before macro expansion")) {
2727 return true;
2728 }
2729
2730 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2731 switch (n->class_id()) {
2732 case Node::Class_Lock:
2733 expand_lock_node(n->as_Lock());
2734 break;
2735 case Node::Class_Unlock:
2736 expand_unlock_node(n->as_Unlock());
2737 break;
2738 case Node::Class_ArrayCopy:
2739 expand_arraycopy_node(n->as_ArrayCopy());
2740 break;
2741 case Node::Class_SubTypeCheck:
2742 expand_subtypecheck_node(n->as_SubTypeCheck());
2743 break;
2744 default:
2745 switch (n->Opcode()) {
2746 case Op_ModD:
2747 case Op_ModF:
2748 case Op_PowD: {
2749 CallLeafPureNode* call_macro = n->as_CallLeafPure();
2750 CallLeafPureNode* call = call_macro->inline_call_leaf_pure_node();
2751 _igvn.replace_node(call_macro, call);
2752 transform_later(call);
2753 break;
2754 }
2755 default:
2756 assert(false, "unknown node type in macro list");
2757 }
2758 }
2759 assert(C->macro_count() == (old_macro_count - 1), "expansion must have deleted one node from macro list");
2760 if (C->failing()) return true;
2761 C->print_method(PHASE_AFTER_MACRO_EXPANSION_STEP, 5, n);
2762
2763 // Clean up the graph so we're less likely to hit the maximum node
|
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "ci/ciFlatArrayKlass.hpp"
26 #include "ci/ciInlineKlass.hpp"
27 #include "ci/ciInstanceKlass.hpp"
28 #include "compiler/compileLog.hpp"
29 #include "gc/shared/collectedHeap.inline.hpp"
30 #include "gc/shared/tlab_globals.hpp"
31 #include "libadt/vectset.hpp"
32 #include "memory/universe.hpp"
33 #include "opto/addnode.hpp"
34 #include "opto/arraycopynode.hpp"
35 #include "opto/callnode.hpp"
36 #include "opto/castnode.hpp"
37 #include "opto/cfgnode.hpp"
38 #include "opto/compile.hpp"
39 #include "opto/convertnode.hpp"
40 #include "opto/graphKit.hpp"
41 #include "opto/inlinetypenode.hpp"
42 #include "opto/intrinsicnode.hpp"
43 #include "opto/locknode.hpp"
44 #include "opto/loopnode.hpp"
45 #include "opto/macro.hpp"
46 #include "opto/memnode.hpp"
47 #include "opto/narrowptrnode.hpp"
48 #include "opto/node.hpp"
49 #include "opto/opaquenode.hpp"
50 #include "opto/opcodes.hpp"
51 #include "opto/phaseX.hpp"
52 #include "opto/reachability.hpp"
53 #include "opto/rootnode.hpp"
54 #include "opto/runtime.hpp"
55 #include "opto/subnode.hpp"
56 #include "opto/subtypenode.hpp"
57 #include "opto/type.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "runtime/continuation.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "utilities/globalDefinitions.hpp"
63 #include "utilities/macros.hpp"
64 #include "utilities/powerOfTwo.hpp"
65 #if INCLUDE_G1GC
66 #include "gc/g1/g1ThreadLocalData.hpp"
67 #endif // INCLUDE_G1GC
68
69
70 //
71 // Replace any references to "oldref" in inputs to "use" with "newref".
72 // Returns the number of replacements made.
73 //
74 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) {
75 int nreplacements = 0;
76 uint req = use->req();
77 for (uint j = 0; j < use->len(); j++) {
78 Node *uin = use->in(j);
79 if (uin == oldref) {
80 if (j < req)
81 use->set_req(j, newref);
82 else
83 use->set_prec(j, newref);
84 nreplacements++;
85 } else if (j >= req && uin == nullptr) {
86 break;
87 }
88 }
89 return nreplacements;
90 }
91
92
93 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word) {
94 Node* cmp = word;
95 Node* bol = transform_later(new BoolNode(cmp, BoolTest::ne));
96 IfNode* iff = new IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
97 transform_later(iff);
98
99 // Fast path taken.
100 Node *fast_taken = transform_later(new IfFalseNode(iff));
101
102 // Fast path not-taken, i.e. slow path
103 Node *slow_taken = transform_later(new IfTrueNode(iff));
104
105 region->init_req(edge, fast_taken); // Capture fast-control
106 return slow_taken;
107 }
108
109 //--------------------copy_predefined_input_for_runtime_call--------------------
110 void PhaseMacroExpand::copy_predefined_input_for_runtime_call(Node * ctrl, CallNode* oldcall, CallNode* call) {
111 // Set fixed predefined input arguments
124 // Slow-path call
125 CallNode *call = leaf_name
126 ? (CallNode*)new CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM )
127 : (CallNode*)new CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), TypeRawPtr::BOTTOM );
128
129 // Slow path call has no side-effects, uses few values
130 copy_predefined_input_for_runtime_call(slow_path, oldcall, call );
131 if (parm0 != nullptr) call->init_req(TypeFunc::Parms+0, parm0);
132 if (parm1 != nullptr) call->init_req(TypeFunc::Parms+1, parm1);
133 if (parm2 != nullptr) call->init_req(TypeFunc::Parms+2, parm2);
134 call->copy_call_debug_info(&_igvn, oldcall);
135 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
136 _igvn.replace_node(oldcall, call);
137 transform_later(call);
138
139 return call;
140 }
141
142 void PhaseMacroExpand::eliminate_gc_barrier(Node* p2x) {
143 BarrierSetC2 *bs = BarrierSet::barrier_set()->barrier_set_c2();
144 bs->eliminate_gc_barrier(&_igvn, p2x);
145 #ifndef PRODUCT
146 if (PrintOptoStatistics) {
147 AtomicAccess::inc(&PhaseMacroExpand::_GC_barriers_removed_counter);
148 }
149 #endif
150 }
151
152 // Search for a memory operation for the specified memory slice.
153 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) {
154 Node *orig_mem = mem;
155 Node *alloc_mem = alloc->as_Allocate()->proj_out_or_null(TypeFunc::Memory, /*io_use:*/false);
156 assert(alloc_mem != nullptr, "Allocation without a memory projection.");
157 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr();
158 while (true) {
159 if (mem == alloc_mem || mem == start_mem ) {
160 return mem; // hit one of our sentinels
161 } else if (mem->is_MergeMem()) {
162 mem = mem->as_MergeMem()->memory_at(alias_idx);
163 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) {
164 Node *in = mem->in(0);
167 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) {
168 return in;
169 } else if (in->is_Call()) {
170 CallNode *call = in->as_Call();
171 if (call->may_modify(tinst, phase)) {
172 assert(call->is_ArrayCopy(), "ArrayCopy is the only call node that doesn't make allocation escape");
173 if (call->as_ArrayCopy()->modifies(offset, offset, phase, false)) {
174 return in;
175 }
176 }
177 mem = in->in(TypeFunc::Memory);
178 } else if (in->is_MemBar()) {
179 ArrayCopyNode* ac = nullptr;
180 if (ArrayCopyNode::may_modify(tinst, in->as_MemBar(), phase, ac)) {
181 if (ac != nullptr) {
182 assert(ac->is_clonebasic(), "Only basic clone is a non escaping clone");
183 return ac;
184 }
185 }
186 mem = in->in(TypeFunc::Memory);
187 } else if (in->is_LoadFlat() || in->is_StoreFlat()) {
188 mem = in->in(TypeFunc::Memory);
189 } else {
190 #ifdef ASSERT
191 in->dump();
192 mem->dump();
193 assert(false, "unexpected projection");
194 #endif
195 }
196 } else if (mem->is_Store()) {
197 const TypePtr* atype = mem->as_Store()->adr_type();
198 int adr_idx = phase->C->get_alias_index(atype);
199 if (adr_idx == alias_idx) {
200 assert(atype->isa_oopptr(), "address type must be oopptr");
201 int adr_offset = atype->flat_offset();
202 uint adr_iid = atype->is_oopptr()->instance_id();
203 // Array elements references have the same alias_idx
204 // but different offset and different instance_id.
205 if (adr_offset == offset && adr_iid == alloc->_idx) {
206 return mem;
207 }
208 } else {
209 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw");
210 }
211 mem = mem->in(MemNode::Memory);
212 } else if (mem->is_ClearArray()) {
213 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) {
214 // Can not bypass initialization of the instance
215 // we are looking.
216 DEBUG_ONLY(intptr_t offset;)
217 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity");
218 InitializeNode* init = alloc->as_Allocate()->initialization();
219 // We are looking for stored value, return Initialize node
220 // or memory edge from Allocate node.
221 if (init != nullptr) {
226 }
227 // Otherwise skip it (the call updated 'mem' value).
228 } else if (mem->Opcode() == Op_SCMemProj) {
229 mem = mem->in(0);
230 Node* adr = nullptr;
231 if (mem->is_LoadStore()) {
232 adr = mem->in(MemNode::Address);
233 } else {
234 assert(mem->Opcode() == Op_EncodeISOArray ||
235 mem->Opcode() == Op_StrCompressedCopy, "sanity");
236 adr = mem->in(3); // Destination array
237 }
238 const TypePtr* atype = adr->bottom_type()->is_ptr();
239 int adr_idx = phase->C->get_alias_index(atype);
240 if (adr_idx == alias_idx) {
241 DEBUG_ONLY(mem->dump();)
242 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
243 return nullptr;
244 }
245 mem = mem->in(MemNode::Memory);
246 } else if (mem->Opcode() == Op_StrInflatedCopy) {
247 Node* adr = mem->in(3); // Destination array
248 const TypePtr* atype = adr->bottom_type()->is_ptr();
249 int adr_idx = phase->C->get_alias_index(atype);
250 if (adr_idx == alias_idx) {
251 DEBUG_ONLY(mem->dump();)
252 assert(false, "Object is not scalar replaceable if a StrInflatedCopy node accesses its field");
253 return nullptr;
254 }
255 mem = mem->in(MemNode::Memory);
256 } else {
257 return mem;
258 }
259 assert(mem != orig_mem, "dead memory loop");
260 }
261 }
262
263 // Determine if there is an interfering store between a rematerialization load and an arraycopy that is in the process
264 // of being elided. Starting from the given rematerialization load this method starts a BFS traversal upwards through
265 // the memory graph towards the provided ArrayCopyNode. For every node encountered on the traversal, check that it is
266 // independent from the provided rematerialization. Returns false if every node on the traversal is independent and
306 // Generate loads from source of the arraycopy for fields of destination needed at a deoptimization point.
307 // Returns nullptr if the load cannot be created because the arraycopy is not suitable for elimination
308 // (e.g. copy inside the array with non-constant offsets) or the inputs do not match our assumptions (e.g.
309 // the arraycopy does not actually write something at the provided offset).
310 Node* PhaseMacroExpand::make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, Node* mem, BasicType ft, const Type* ftype, AllocateNode* alloc) {
311 assert((ctl == ac->control() && mem == ac->memory()) != (mem != ac->memory() && ctl->is_Proj() && ctl->as_Proj()->is_uncommon_trap_proj()),
312 "Either the control and memory are the same as for the arraycopy or they are pinned in an uncommon trap.");
313 BasicType bt = ft;
314 const Type *type = ftype;
315 if (ft == T_NARROWOOP) {
316 bt = T_OBJECT;
317 type = ftype->make_oopptr();
318 }
319 Node* base = ac->in(ArrayCopyNode::Src);
320 Node* adr = nullptr;
321 const TypePtr* adr_type = nullptr;
322
323 if (ac->is_clonebasic()) {
324 assert(ac->in(ArrayCopyNode::Src) != ac->in(ArrayCopyNode::Dest), "clone source equals destination");
325 adr = _igvn.transform(AddPNode::make_with_base(base, _igvn.MakeConX(offset)));
326 adr_type = _igvn.type(base)->is_ptr();
327 if (adr_type->isa_aryptr()) {
328 adr_type = adr_type->is_aryptr()->add_field_offset_and_offset(offset);
329 } else {
330 adr_type = adr_type->add_offset(offset);
331 }
332 } else {
333 if (!ac->modifies(offset, offset, &_igvn, true)) {
334 // If the arraycopy does not copy to this offset, we cannot generate a rematerialization load for it.
335 return nullptr;
336 }
337 assert(ac->in(ArrayCopyNode::Dest) == alloc->result_cast(), "arraycopy destination should be allocation's result");
338 uint shift = exact_log2(type2aelembytes(bt));
339 Node* src_pos = ac->in(ArrayCopyNode::SrcPos);
340 Node* dest_pos = ac->in(ArrayCopyNode::DestPos);
341 const TypeInt* src_pos_t = _igvn.type(src_pos)->is_int();
342 const TypeInt* dest_pos_t = _igvn.type(dest_pos)->is_int();
343
344 adr_type = _igvn.type(base)->is_aryptr();
345 if (((const TypeAryPtr*)adr_type)->is_flat()) {
346 shift = ((const TypeAryPtr*)adr_type)->flat_log_elem_size();
347 }
348 if (src_pos_t->is_con() && dest_pos_t->is_con()) {
349 intptr_t off = ((src_pos_t->get_con() - dest_pos_t->get_con()) << shift) + offset;
350 adr = _igvn.transform(AddPNode::make_with_base(base, base, _igvn.MakeConX(off)));
351 adr_type = _igvn.type(adr)->is_aryptr();
352 assert(adr_type == _igvn.type(base)->is_aryptr()->add_field_offset_and_offset(off), "incorrect address type");
353 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
354 // Don't emit a new load from src if src == dst but try to get the value from memory instead
355 return value_from_mem(ac, ctl, ft, ftype, (const TypeAryPtr*)adr_type, alloc);
356 }
357 } else {
358 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
359 // Non constant offset in the array: we can't statically
360 // determine the value
361 return nullptr;
362 }
363 Node* diff = _igvn.transform(new SubINode(ac->in(ArrayCopyNode::SrcPos), ac->in(ArrayCopyNode::DestPos)));
364 #ifdef _LP64
365 diff = _igvn.transform(new ConvI2LNode(diff));
366 #endif
367 diff = _igvn.transform(new LShiftXNode(diff, _igvn.intcon(shift)));
368
369 Node* off = _igvn.transform(new AddXNode(_igvn.MakeConX(offset), diff));
370 adr = _igvn.transform(AddPNode::make_with_base(base, base, off));
371 // In the case of a flat inline type array, each field has its
372 // own slice so we need to extract the field being accessed from
373 // the address computation
374 adr_type = ((TypeAryPtr*)adr_type)->add_field_offset_and_offset(offset)->add_offset(Type::OffsetBot)->is_aryptr();
375 adr = _igvn.transform(new CastPPNode(ctl, adr, adr_type));
376 }
377 }
378 assert(adr != nullptr && adr_type != nullptr, "sanity");
379
380 // Create the rematerialization load ...
381 MergeMemNode* mergemem = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
382 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
383 Node* res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemem, adr, adr_type, type, bt);
384 assert(res != nullptr, "load should have been created");
385
386 // ... and ensure that pinning the rematerialization load inside the uncommon path is safe.
387 if (mem != ac->memory() && ctl->is_Proj() && ctl->as_Proj()->is_uncommon_trap_proj() && res->is_Load() &&
388 has_interfering_store(ac, res->as_Load(), &_igvn)) {
389 // Not safe: use control and memory from the arraycopy to ensure correct memory state.
390 _igvn.remove_dead_node(res, PhaseIterGVN::NodeOrigin::Graph); // Clean up the unusable rematerialization load.
391 return make_arraycopy_load(ac, offset, ac->control(), ac->memory(), ft, ftype, alloc);
392 }
393
394 if (ftype->isa_narrowoop()) {
395 // PhaseMacroExpand::scalar_replacement adds DecodeN nodes
396 res = _igvn.transform(new EncodePNode(res, ftype));
397 }
398 return res;
399 }
400
401 //
402 // Given a Memory Phi, compute a value Phi containing the values from stores
403 // on the input paths.
404 // Note: this function is recursive, its depth is limited by the "level" argument
405 // Returns the computed Phi, or null if it cannot compute it.
406 Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *phi_type, const TypeOopPtr *adr_t, AllocateNode *alloc, Node_Stack *value_phis, int level) {
407 assert(mem->is_Phi(), "sanity");
408 int alias_idx = C->get_alias_index(adr_t);
409 int offset = adr_t->flat_offset();
410 int instance_id = adr_t->instance_id();
411
412 // Check if an appropriate value phi already exists.
413 Node* region = mem->in(0);
414 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) {
415 Node* phi = region->fast_out(k);
416 if (phi->is_Phi() && phi != mem &&
417 phi->as_Phi()->is_same_inst_field(phi_type, (int)mem->_idx, instance_id, alias_idx, offset)) {
418 return phi;
419 }
420 }
421 // Check if an appropriate new value phi already exists.
422 Node* new_phi = value_phis->find(mem->_idx);
423 if (new_phi != nullptr)
424 return new_phi;
425
426 if (level <= 0) {
427 return nullptr; // Give up: phi tree too deep
428 }
429 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
430 Node *alloc_mem = alloc->proj_out_or_null(TypeFunc::Memory, /*io_use:*/false);
431 assert(alloc_mem != nullptr, "Allocation without a memory projection.");
432
433 uint length = mem->req();
434 GrowableArray <Node *> values(length, length, nullptr);
435
436 // create a new Phi for the value
437 PhiNode *phi = new PhiNode(mem->in(0), phi_type, nullptr, mem->_idx, instance_id, alias_idx, offset);
438 transform_later(phi);
439 value_phis->push(phi, mem->_idx);
440
441 for (uint j = 1; j < length; j++) {
442 Node *in = mem->in(j);
443 if (in == nullptr || in->is_top()) {
444 values.at_put(j, in);
445 } else {
446 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn);
447 if (val == start_mem || val == alloc_mem) {
448 // hit a sentinel, return appropriate value
449 Node* init_value = value_from_alloc(ft, adr_t, alloc);
450 if (init_value == nullptr) {
451 return nullptr;
452 } else {
453 values.at_put(j, init_value);
454 continue;
455 }
456 }
457 if (val->is_Initialize()) {
458 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
459 }
460 if (val == nullptr) {
461 return nullptr; // can't find a value on this path
462 }
463 if (val == mem) {
464 values.at_put(j, mem);
465 } else if (val->is_Store()) {
466 Node* n = val->in(MemNode::ValueIn);
467 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
468 n = bs->step_over_gc_barrier(n);
469 if (is_subword_type(ft)) {
470 n = Compile::narrow_value(ft, n, phi_type, &_igvn, true);
471 }
472 values.at_put(j, n);
473 } else if (val->is_Proj() && val->in(0) == alloc) {
474 Node* init_value = value_from_alloc(ft, adr_t, alloc);
475 if (init_value == nullptr) {
476 return nullptr;
477 } else {
478 values.at_put(j, init_value);
479 }
480 } else if (val->is_Phi()) {
481 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1);
482 if (val == nullptr) {
483 return nullptr;
484 }
485 values.at_put(j, val);
486 } else if (val->Opcode() == Op_SCMemProj) {
487 assert(val->in(0)->is_LoadStore() ||
488 val->in(0)->Opcode() == Op_EncodeISOArray ||
489 val->in(0)->Opcode() == Op_StrCompressedCopy, "sanity");
490 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
491 return nullptr;
492 } else if (val->is_ArrayCopy()) {
493 Node* res = make_arraycopy_load(val->as_ArrayCopy(), offset, val->in(0), val->in(TypeFunc::Memory), ft, phi_type, alloc);
494 if (res == nullptr) {
495 return nullptr;
496 }
497 values.at_put(j, res);
498 } else if (val->is_top()) {
499 // This indicates that this path into the phi is dead. Top will eventually also propagate into the Region.
500 // IGVN will clean this up later.
501 values.at_put(j, val);
502 } else {
503 DEBUG_ONLY( val->dump(); )
504 assert(false, "unknown node on this path");
505 return nullptr; // unknown node on this path
506 }
507 }
508 }
509 // Set Phi's inputs
510 for (uint j = 1; j < length; j++) {
511 if (values.at(j) == mem) {
512 phi->init_req(j, phi);
513 } else {
514 phi->init_req(j, values.at(j));
515 }
516 }
517 return phi;
518 }
519
520 // Extract the initial value of a field in an allocation
521 Node* PhaseMacroExpand::value_from_alloc(BasicType ft, const TypeOopPtr* adr_t, AllocateNode* alloc) {
522 Node* init_value = alloc->in(AllocateNode::InitValue);
523 if (init_value == nullptr) {
524 assert(alloc->in(AllocateNode::RawInitValue) == nullptr, "conflicting InitValue and RawInitValue");
525 return _igvn.zerocon(ft);
526 }
527
528 const TypeAryPtr* ary_t = adr_t->isa_aryptr();
529 assert(ary_t != nullptr, "must be a pointer into an array");
530
531 // If this is not a flat array, then it must be an oop array with elements being init_value
532 if (ary_t->is_not_flat()) {
533 #ifdef ASSERT
534 BasicType init_bt = init_value->bottom_type()->basic_type();
535 assert(ft == init_bt ||
536 (!is_java_primitive(ft) && !is_java_primitive(init_bt) && type2aelembytes(ft, true) == type2aelembytes(init_bt, true)) ||
537 (is_subword_type(ft) && init_bt == T_INT),
538 "invalid init_value of type %s for field of type %s", type2name(init_bt), type2name(ft));
539 #endif // ASSERT
540 return init_value;
541 }
542
543 assert(ary_t->klass_is_exact() && ary_t->is_flat(), "must be an exact flat array");
544 assert(ary_t->field_offset().get() != Type::OffsetBot, "unknown offset");
545 if (init_value->is_EncodeP()) {
546 init_value = init_value->in(1);
547 }
548 // Cannot look through init_value if it is an oop
549 if (!init_value->is_InlineType()) {
550 return nullptr;
551 }
552
553 ciInlineKlass* vk = init_value->bottom_type()->inline_klass();
554 if (ary_t->field_offset().get() == vk->null_marker_offset_in_payload()) {
555 init_value = init_value->as_InlineType()->get_null_marker();
556 } else {
557 init_value = init_value->as_InlineType()->field_value_by_offset(ary_t->field_offset().get() + vk->payload_offset(), true);
558 }
559
560 if (ft == T_NARROWOOP) {
561 assert(init_value->bottom_type()->isa_ptr(), "must be a pointer");
562 init_value = transform_later(new EncodePNode(init_value, init_value->bottom_type()->make_narrowoop()));
563 }
564
565 #ifdef ASSERT
566 BasicType init_bt = init_value->bottom_type()->basic_type();
567 assert(ft == init_bt ||
568 (!is_java_primitive(ft) && !is_java_primitive(init_bt) && type2aelembytes(ft, true) == type2aelembytes(init_bt, true)) ||
569 (is_subword_type(ft) && init_bt == T_INT),
570 "invalid init_value of type %s for field of type %s", type2name(init_bt), type2name(ft));
571 #endif // ASSERT
572
573 return init_value;
574 }
575
576 // Search the last value stored into the object's field.
577 Node* PhaseMacroExpand::value_from_mem(Node* origin, Node* ctl, BasicType ft, const Type* ftype, const TypeOopPtr* adr_t, AllocateNode* alloc) {
578 assert(adr_t->is_known_instance_field(), "instance required");
579 int instance_id = adr_t->instance_id();
580 assert((uint)instance_id == alloc->_idx, "wrong allocation");
581
582 int alias_idx = C->get_alias_index(adr_t);
583 int offset = adr_t->flat_offset();
584 Node* orig_mem = origin->in(TypeFunc::Memory);
585 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
586 Node *alloc_mem = alloc->proj_out_or_null(TypeFunc::Memory, /*io_use:*/false);
587 assert(alloc_mem != nullptr, "Allocation without a memory projection.");
588 VectorSet visited;
589
590 bool done = orig_mem == alloc_mem;
591 Node *mem = orig_mem;
592 while (!done) {
593 if (visited.test_set(mem->_idx)) {
594 return nullptr; // found a loop, give up
595 }
596 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn);
597 if (mem == start_mem || mem == alloc_mem) {
598 done = true; // hit a sentinel, return appropriate 0 value
599 } else if (mem->is_Initialize()) {
600 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
601 if (mem == nullptr) {
602 done = true; // Something went wrong.
603 } else if (mem->is_Store()) {
604 const TypePtr* atype = mem->as_Store()->adr_type();
605 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice");
606 done = true;
607 }
608 } else if (mem->is_Store()) {
609 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr();
610 assert(atype != nullptr, "address type must be oopptr");
611 assert(C->get_alias_index(atype) == alias_idx &&
612 atype->is_known_instance_field() && atype->flat_offset() == offset &&
613 atype->instance_id() == instance_id, "store is correct memory slice");
614 done = true;
615 } else if (mem->is_Phi()) {
616 // try to find a phi's unique input
617 Node *unique_input = nullptr;
618 Node *top = C->top();
619 for (uint i = 1; i < mem->req(); i++) {
620 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn);
621 if (n == nullptr || n == top || n == mem) {
622 continue;
623 } else if (unique_input == nullptr) {
624 unique_input = n;
625 } else if (unique_input != n) {
626 unique_input = top;
627 break;
628 }
629 }
630 if (unique_input != nullptr && unique_input != top) {
631 mem = unique_input;
632 } else {
633 done = true;
634 }
635 } else if (mem->is_ArrayCopy()) {
636 done = true;
637 } else if (mem->is_top()) {
638 // The slice is on a dead path. Returning nullptr would lead to elimination
639 // bailout, but we want to prevent that. Just forwarding the top is also legal,
640 // and IGVN can just clean things up, and remove whatever receives top.
641 return mem;
642 } else {
643 DEBUG_ONLY( mem->dump(); )
644 assert(false, "unexpected node");
645 }
646 }
647 if (mem != nullptr) {
648 if (mem == start_mem || mem == alloc_mem) {
649 // hit a sentinel, return appropriate value
650 return value_from_alloc(ft, adr_t, alloc);
651 } else if (mem->is_Store()) {
652 Node* n = mem->in(MemNode::ValueIn);
653 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
654 n = bs->step_over_gc_barrier(n);
655 return n;
656 } else if (mem->is_Phi()) {
657 // attempt to produce a Phi reflecting the values on the input paths of the Phi
658 Node_Stack value_phis(8);
659 Node* phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit);
660 if (phi != nullptr) {
661 return phi;
662 } else {
663 // Kill all new Phis
664 while(value_phis.is_nonempty()) {
665 Node* n = value_phis.node();
666 _igvn.replace_node(n, C->top());
667 value_phis.pop();
668 }
669 }
670 } else if (mem->is_ArrayCopy()) {
671 // Rematerialize the scalar-replaced array. If possible, pin the loads to the uncommon path of the uncommon trap.
672 // Check for each element of the source array, whether it was modified. If not, pin both memory and control to
673 // the uncommon path. Otherwise, use the control and memory state of the arraycopy. Control and memory state must
674 // come from the same source to prevent anti-dependence problems in the backend.
675 ArrayCopyNode* ac = mem->as_ArrayCopy();
676 Node* ac_ctl = ac->control();
677 Node* ac_mem = ac->memory();
678 if (ctl->is_Proj() && ctl->as_Proj()->is_uncommon_trap_proj()) {
679 // pin the loads in the uncommon trap path
680 ac_ctl = ctl;
681 ac_mem = orig_mem;
682 }
683 return make_arraycopy_load(ac, offset, ac_ctl, ac_mem, ft, ftype, alloc);
684 }
685 }
686 // Something went wrong.
687 return nullptr;
688 }
689
690 // Search the last value stored into the inline type's fields (for flat arrays).
691 Node* PhaseMacroExpand::inline_type_from_mem(ciInlineKlass* vk, const TypeAryPtr* elem_adr_type, int elem_idx, int offset_in_element, bool null_free, AllocateNode* alloc, SafePointNode* sfpt) {
692 auto report_failure = [&](int field_offset_in_element) {
693 #ifndef PRODUCT
694 if (PrintEliminateAllocations) {
695 ciInlineKlass* elem_klass = elem_adr_type->elem()->inline_klass();
696 int offset = field_offset_in_element + elem_klass->payload_offset();
697 ciField* flattened_field = elem_klass->get_field_by_offset(offset, false);
698 assert(flattened_field != nullptr, "must have a field of type %s at offset %d", elem_klass->name()->as_utf8(), offset);
699 tty->print("=== At SafePoint node %d can't find value of field [%s] of array element [%d]", sfpt->_idx, flattened_field->name()->as_utf8(), elem_idx);
700 tty->print(", which prevents elimination of: ");
701 alloc->dump();
702 }
703 #endif // PRODUCT
704 };
705
706 // Create a new InlineTypeNode and retrieve the field values from memory
707 InlineTypeNode* vt = InlineTypeNode::make_uninitialized(_igvn, vk, false);
708 transform_later(vt);
709 if (null_free) {
710 vt->set_null_marker(_igvn);
711 } else {
712 int nm_offset_in_element = offset_in_element + vk->null_marker_offset_in_payload();
713 const TypeAryPtr* nm_adr_type = elem_adr_type->with_field_offset(nm_offset_in_element);
714 Node* nm_value = value_from_mem(sfpt, sfpt->control(), T_BOOLEAN, TypeInt::BOOL, nm_adr_type, alloc);
715 if (nm_value != nullptr) {
716 vt->set_null_marker(_igvn, nm_value);
717 } else {
718 report_failure(nm_offset_in_element);
719 return nullptr;
720 }
721 }
722
723 for (int i = 0; i < vk->nof_declared_nonstatic_fields(); ++i) {
724 ciField* field = vt->field(i);
725 ciType* field_type = field->type();
726 int field_offset_in_element = offset_in_element + field->offset_in_bytes() - vk->payload_offset();
727 Node* field_value = nullptr;
728 assert(!field->is_flat() || field->type()->is_inlinetype(), "must be an inline type");
729 if (field->is_flat()) {
730 field_value = inline_type_from_mem(field_type->as_inline_klass(), elem_adr_type, elem_idx, field_offset_in_element, field->is_null_free(), alloc, sfpt);
731 } else {
732 const Type* ft = Type::get_const_type(field_type);
733 BasicType bt = type2field[field_type->basic_type()];
734 if (UseCompressedOops && !is_java_primitive(bt)) {
735 ft = ft->make_narrowoop();
736 bt = T_NARROWOOP;
737 }
738 // Each inline type field has its own memory slice
739 const TypeAryPtr* field_adr_type = elem_adr_type->with_field_offset(field_offset_in_element);
740 field_value = value_from_mem(sfpt, sfpt->control(), bt, ft, field_adr_type, alloc);
741 if (field_value == nullptr) {
742 report_failure(field_offset_in_element);
743 } else if (ft->isa_narrowoop()) {
744 assert(UseCompressedOops, "unexpected narrow oop");
745 if (field_value->is_EncodeP()) {
746 field_value = field_value->in(1);
747 } else if (!field_value->is_InlineType()) {
748 field_value = transform_later(new DecodeNNode(field_value, field_value->get_ptr_type()));
749 }
750 }
751 }
752 if (field_value != nullptr) {
753 vt->set_field_value(i, field_value);
754 } else {
755 return nullptr;
756 }
757 }
758 return vt;
759 }
760
761 // Check the possibility of scalar replacement.
762 bool PhaseMacroExpand::can_eliminate_allocation(PhaseIterGVN* igvn, AllocateNode *alloc, GrowableArray <SafePointNode *>* safepoints) {
763 // Scan the uses of the allocation to check for anything that would
764 // prevent us from eliminating it.
765 NOT_PRODUCT( const char* fail_eliminate = nullptr; )
766 DEBUG_ONLY( Node* disq_node = nullptr; )
767 bool can_eliminate = true;
768 bool reduce_merge_precheck = (safepoints == nullptr);
769
770 Unique_Node_List worklist;
771 Node* res = alloc->result_cast();
772 const TypeOopPtr* res_type = nullptr;
773 if (res == nullptr) {
774 // All users were eliminated.
775 } else if (!res->is_CheckCastPP()) {
776 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";)
777 can_eliminate = false;
778 } else {
779 worklist.push(res);
780 res_type = igvn->type(res)->isa_oopptr();
781 if (res_type == nullptr) {
782 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";)
783 can_eliminate = false;
784 } else if (!res_type->klass_is_exact()) {
785 NOT_PRODUCT(fail_eliminate = "Not an exact type.";)
786 can_eliminate = false;
787 } else if (res_type->isa_aryptr()) {
788 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1);
789 if (length < 0) {
790 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";)
791 can_eliminate = false;
792 }
793 }
794 }
795
796 while (can_eliminate && worklist.size() > 0) {
797 BarrierSetC2 *bs = BarrierSet::barrier_set()->barrier_set_c2();
798 res = worklist.pop();
799 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); j < jmax && can_eliminate; j++) {
800 Node* use = res->fast_out(j);
801
802 if (use->is_AddP()) {
803 const TypePtr* addp_type = igvn->type(use)->is_ptr();
804 int offset = addp_type->offset();
805
806 if (offset == Type::OffsetTop || offset == Type::OffsetBot) {
807 NOT_PRODUCT(fail_eliminate = "Undefined field reference";)
808 can_eliminate = false;
809 break;
810 }
811 for (DUIterator_Fast kmax, k = use->fast_outs(kmax);
812 k < kmax && can_eliminate; k++) {
813 Node* n = use->fast_out(k);
814 if ((n->is_Mem() && n->as_Mem()->is_mismatched_access()) || n->is_LoadFlat() || n->is_StoreFlat()) {
815 DEBUG_ONLY(disq_node = n);
816 NOT_PRODUCT(fail_eliminate = "Mismatched access");
817 can_eliminate = false;
818 }
819 if (!n->is_Store() && n->Opcode() != Op_CastP2X && !bs->is_gc_pre_barrier_node(n) && !reduce_merge_precheck) {
820 DEBUG_ONLY(disq_node = n;)
821 if (n->is_Load() || n->is_LoadStore()) {
822 NOT_PRODUCT(fail_eliminate = "Field load";)
823 } else {
824 NOT_PRODUCT(fail_eliminate = "Not store field reference";)
825 }
826 can_eliminate = false;
827 }
828 }
829 } else if (use->is_ArrayCopy() &&
830 (use->as_ArrayCopy()->is_clonebasic() ||
831 use->as_ArrayCopy()->is_arraycopy_validated() ||
832 use->as_ArrayCopy()->is_copyof_validated() ||
833 use->as_ArrayCopy()->is_copyofrange_validated()) &&
834 use->in(ArrayCopyNode::Dest) == res) {
835 // ok to eliminate
836 } else if (use->is_ReachabilityFence() && OptimizeReachabilityFences) {
837 // ok to eliminate
838 } else if (use->is_SafePoint()) {
839 SafePointNode* sfpt = use->as_SafePoint();
840 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) {
841 // Object is passed as argument.
842 DEBUG_ONLY(disq_node = use;)
843 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";)
844 can_eliminate = false;
845 }
846 Node* sfptMem = sfpt->memory();
847 if (sfptMem == nullptr || sfptMem->is_top()) {
848 DEBUG_ONLY(disq_node = use;)
849 NOT_PRODUCT(fail_eliminate = "null or TOP memory";)
850 can_eliminate = false;
851 } else if (!reduce_merge_precheck) {
852 assert(!res->is_Phi() || !res->as_Phi()->can_be_inline_type(), "Inline type allocations should not have safepoint uses");
853 safepoints->append_if_missing(sfpt);
854 }
855 } else if (use->is_InlineType() && use->as_InlineType()->get_oop() == res) {
856 // Look at uses
857 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); k < kmax; k++) {
858 Node* u = use->fast_out(k);
859 if (u->is_InlineType()) {
860 // Use in flat field can be eliminated
861 InlineTypeNode* vt = u->as_InlineType();
862 for (uint i = 0; i < vt->field_count(); ++i) {
863 if (vt->field_value(i) == use && !vt->field(i)->is_flat()) {
864 can_eliminate = false; // Use in non-flat field
865 break;
866 }
867 }
868 } else {
869 // Add other uses to the worklist to process individually
870 worklist.push(use);
871 }
872 }
873 } else if (use->Opcode() == Op_StoreX && use->in(MemNode::Address) == res) {
874 // Store to mark word of inline type larval buffer
875 assert(res_type->is_inlinetypeptr(), "Unexpected store to mark word");
876 } else if (res_type->is_inlinetypeptr() && (use->Opcode() == Op_MemBarRelease || use->Opcode() == Op_MemBarStoreStore)) {
877 // Inline type buffer allocations are followed by a membar
878 } else if (reduce_merge_precheck &&
879 (use->is_Phi() || use->is_EncodeP() ||
880 use->Opcode() == Op_MemBarRelease ||
881 (UseStoreStoreForCtor && use->Opcode() == Op_MemBarStoreStore))) {
882 // Nothing to do
883 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark
884 if (use->is_Phi()) {
885 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) {
886 NOT_PRODUCT(fail_eliminate = "Object is return value";)
887 } else {
888 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";)
889 }
890 DEBUG_ONLY(disq_node = use;)
891 } else {
892 if (use->Opcode() == Op_Return) {
893 NOT_PRODUCT(fail_eliminate = "Object is return value";)
894 } else {
895 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";)
896 }
897 DEBUG_ONLY(disq_node = use;)
898 }
899 can_eliminate = false;
900 } else {
901 assert(use->Opcode() == Op_CastP2X, "should be");
902 assert(!use->has_out_with(Op_OrL), "should have been removed because oop is never null");
903 }
904 }
905 }
906
907 #ifndef PRODUCT
908 if (PrintEliminateAllocations && safepoints != nullptr) {
909 if (can_eliminate) {
910 tty->print("Scalar ");
911 if (res == nullptr)
912 alloc->dump();
913 else
914 res->dump();
915 } else {
916 tty->print("NotScalar (%s)", fail_eliminate);
917 if (res == nullptr)
918 alloc->dump();
919 else
920 res->dump();
921 #ifdef ASSERT
922 if (disq_node != nullptr) {
923 tty->print(" >>>> ");
924 disq_node->dump();
925 }
926 #endif /*ASSERT*/
927 }
928 }
929
930 if (TraceReduceAllocationMerges && !can_eliminate && reduce_merge_precheck) {
931 tty->print_cr("\tCan't eliminate allocation because '%s': ", fail_eliminate != nullptr ? fail_eliminate : "");
932 DEBUG_ONLY(if (disq_node != nullptr) disq_node->dump();)
933 }
934 #endif
935 return can_eliminate;
1009 // CheckCastPP result was not updated in the stack slot, and so
1010 // we ended up using the CastPP. That means that the field knows
1011 // that it should get an oop from an interface, but the value lost
1012 // that information, and so it is not a subtype.
1013 // There may be other issues, feel free to investigate further!
1014 if (!is_java_primitive(value_bt)) { return; }
1015
1016 tty->print_cr("value not compatible for field: %s vs %s",
1017 type2name(value_bt),
1018 type2name(field_bt));
1019 tty->print("value_type: ");
1020 value_type->dump();
1021 tty->cr();
1022 tty->print("field_type: ");
1023 field_type->dump();
1024 tty->cr();
1025 assert(false, "value_type does not fit field_type");
1026 }
1027 #endif
1028
1029 void PhaseMacroExpand::process_field_value_at_safepoint(const Type* field_type, Node* field_val, SafePointNode* sfpt, Unique_Node_List* value_worklist) {
1030 if (UseCompressedOops && field_type->isa_narrowoop()) {
1031 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
1032 // to be able scalar replace the allocation.
1033 if (field_val->is_EncodeP()) {
1034 field_val = field_val->in(1);
1035 } else if (!field_val->is_InlineType()) {
1036 field_val = transform_later(new DecodeNNode(field_val, field_val->get_ptr_type()));
1037 }
1038 }
1039
1040 // Keep track of inline types to scalarize them later
1041 if (field_val->is_InlineType()) {
1042 value_worklist->push(field_val);
1043 } else if (field_val->is_Phi()) {
1044 PhiNode* phi = field_val->as_Phi();
1045 // Eagerly replace inline type phis now since we could be removing an inline type allocation where we must
1046 // scalarize all its fields in safepoints.
1047 field_val = phi->try_push_inline_types_down(&_igvn, true);
1048 if (field_val->is_InlineType()) {
1049 value_worklist->push(field_val);
1050 }
1051 }
1052 DEBUG_ONLY(verify_type_compatability(field_val->bottom_type(), field_type);)
1053 sfpt->add_req(field_val);
1054 }
1055
1056 bool PhaseMacroExpand::add_array_elems_to_safepoint(AllocateNode* alloc, const TypeAryPtr* array_type, SafePointNode* sfpt, Unique_Node_List* value_worklist) {
1057 const Type* elem_type = array_type->elem();
1058 BasicType basic_elem_type = elem_type->array_element_basic_type();
1059
1060 intptr_t elem_size;
1061 uint header_size;
1062 if (array_type->is_flat()) {
1063 elem_size = array_type->flat_elem_size();
1064 header_size = arrayOopDesc::base_offset_in_bytes(T_FLAT_ELEMENT);
1065 } else {
1066 elem_size = type2aelembytes(basic_elem_type);
1067 header_size = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
1068 }
1069
1070 int n_elems = alloc->in(AllocateNode::ALength)->get_int();
1071 for (int elem_idx = 0; elem_idx < n_elems; elem_idx++) {
1072 intptr_t elem_offset = header_size + elem_idx * elem_size;
1073 const TypeAryPtr* elem_adr_type = array_type->with_offset(elem_offset);
1074 Node* elem_val;
1075 if (array_type->is_flat()) {
1076 ciInlineKlass* elem_klass = elem_type->inline_klass();
1077 assert(elem_klass->maybe_flat_in_array(), "must be flat in array");
1078 elem_val = inline_type_from_mem(elem_klass, elem_adr_type, elem_idx, 0, array_type->is_null_free(), alloc, sfpt);
1079 } else {
1080 elem_val = value_from_mem(sfpt, sfpt->control(), basic_elem_type, elem_type, elem_adr_type, alloc);
1081 #ifndef PRODUCT
1082 if (PrintEliminateAllocations && elem_val == nullptr) {
1083 tty->print("=== At SafePoint node %d can't find value of array element [%d]", sfpt->_idx, elem_idx);
1084 tty->print(", which prevents elimination of: ");
1085 alloc->dump();
1086 }
1087 #endif // PRODUCT
1088 }
1089 if (elem_val == nullptr) {
1090 return false;
1091 }
1092
1093 process_field_value_at_safepoint(elem_type, elem_val, sfpt, value_worklist);
1094 }
1095
1096 return true;
1097 }
1098
1099 // Recursively adds all flattened fields of a type 'iklass' inside 'base' to 'sfpt'.
1100 // 'offset_minus_header' refers to the offset of the payload of 'iklass' inside 'base' minus the
1101 // payload offset of 'iklass'. If 'base' is of type 'iklass' then 'offset_minus_header' == 0.
1102 bool PhaseMacroExpand::add_inst_fields_to_safepoint(ciInstanceKlass* iklass, AllocateNode* alloc, Node* base, int offset_minus_header, SafePointNode* sfpt, Unique_Node_List* value_worklist) {
1103 const TypeInstPtr* base_type = _igvn.type(base)->is_instptr();
1104 auto report_failure = [&](int offset) {
1105 #ifndef PRODUCT
1106 if (PrintEliminateAllocations) {
1107 ciInstanceKlass* base_klass = base_type->instance_klass();
1108 ciField* flattened_field = base_klass->get_field_by_offset(offset, false);
1109 assert(flattened_field != nullptr, "must have a field of type %s at offset %d", base_klass->name()->as_utf8(), offset);
1110 tty->print("=== At SafePoint node %d can't find value of field: ", sfpt->_idx);
1111 flattened_field->print();
1112 int field_idx = C->alias_type(flattened_field)->index();
1113 tty->print(" (alias_idx=%d)", field_idx);
1114 tty->print(", which prevents elimination of: ");
1115 base->dump();
1116 }
1117 #endif // PRODUCT
1118 };
1119
1120 for (int i = 0; i < iklass->nof_declared_nonstatic_fields(); i++) {
1121 ciField* field = iklass->declared_nonstatic_field_at(i);
1122 if (field->is_flat()) {
1123 ciInlineKlass* fvk = field->type()->as_inline_klass();
1124 int field_offset_minus_header = offset_minus_header + field->offset_in_bytes() - fvk->payload_offset();
1125 bool success = add_inst_fields_to_safepoint(fvk, alloc, base, field_offset_minus_header, sfpt, value_worklist);
1126 if (!success) {
1127 return false;
1128 }
1129
1130 // The null marker of a field is added right after we scalarize that field
1131 if (!field->is_null_free()) {
1132 int nm_offset = offset_minus_header + field->null_marker_offset();
1133 Node* null_marker = value_from_mem(sfpt, sfpt->control(), T_BOOLEAN, TypeInt::BOOL, base_type->with_offset(nm_offset), alloc);
1134 if (null_marker == nullptr) {
1135 report_failure(nm_offset);
1136 return false;
1137 }
1138 process_field_value_at_safepoint(TypeInt::BOOL, null_marker, sfpt, value_worklist);
1139 }
1140
1141 continue;
1142 }
1143
1144 int offset = offset_minus_header + field->offset_in_bytes();
1145 ciType* elem_type = field->type();
1146 BasicType basic_elem_type = field->layout_type();
1147
1148 const Type* field_type;
1149 if (is_reference_type(basic_elem_type)) {
1150 if (!elem_type->is_loaded()) {
1151 field_type = TypeInstPtr::BOTTOM;
1152 } else {
1153 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
1154 }
1155 if (UseCompressedOops) {
1156 field_type = field_type->make_narrowoop();
1157 basic_elem_type = T_NARROWOOP;
1158 }
1159 } else {
1160 field_type = Type::get_const_basic_type(basic_elem_type);
1161 }
1162
1163 const TypeInstPtr* field_addr_type = base_type->add_offset(offset)->isa_instptr();
1164 Node* field_val = value_from_mem(sfpt, sfpt->control(), basic_elem_type, field_type, field_addr_type, alloc);
1165 if (field_val == nullptr) {
1166 report_failure(offset);
1167 return false;
1168 }
1169 process_field_value_at_safepoint(field_type, field_val, sfpt, value_worklist);
1170 }
1171
1172 return true;
1173 }
1174
1175 SafePointScalarObjectNode* PhaseMacroExpand::create_scalarized_object_description(AllocateNode* alloc, SafePointNode* sfpt,
1176 Unique_Node_List* value_worklist) {
1177 assert(sfpt->jvms()->endoff() == sfpt->req(), "no extra edges past debug info allowed");
1178
1179 // Fields of scalar objs are referenced only at the end
1180 // of regular debuginfo at the last (youngest) JVMS.
1181 // Record relative start index.
1182 ciInstanceKlass* iklass = nullptr;
1183 const TypeOopPtr* res_type = nullptr;
1184 int nfields = 0;
1185 uint first_ind = (sfpt->req() - sfpt->jvms()->scloff());
1186 Node* res = alloc->result_cast();
1187
1188 assert(res == nullptr || res->is_CheckCastPP(), "unexpected AllocateNode result");
1189 assert(sfpt->jvms() != nullptr, "missed JVMS");
1190 uint before_sfpt_req = sfpt->req();
1191
1192 if (res != nullptr) { // Could be null when there are no users
1193 res_type = _igvn.type(res)->isa_oopptr();
1194
1195 if (res_type->isa_instptr()) {
1196 // find the fields of the class which will be needed for safepoint debug information
1197 iklass = res_type->is_instptr()->instance_klass();
1198 nfields = iklass->nof_nonstatic_fields();
1199 } else {
1200 // find the array's elements which will be needed for safepoint debug information
1201 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1);
1202 assert(nfields >= 0, "must be an array klass.");
1203 }
1204
1205 if (res->bottom_type()->is_inlinetypeptr()) {
1206 // Nullable inline types have a null marker field which is added to the safepoint when scalarizing them (see
1207 // InlineTypeNode::make_scalar_in_safepoint()). When having circular inline types, we stop scalarizing at depth 1
1208 // to avoid an endless recursion. Therefore, we do not have a SafePointScalarObjectNode node here, yet.
1209 // We are about to create a SafePointScalarObjectNode as if this is a normal object. Add an additional int input
1210 // with value 1 which sets the null marker to true to indicate that the object is always non-null. This input is checked
1211 // later in PhaseOutput::filLocArray() for inline types.
1212 sfpt->add_req(_igvn.intcon(1));
1213 }
1214 }
1215
1216 SafePointScalarObjectNode* sobj = new SafePointScalarObjectNode(res_type, alloc, first_ind, sfpt->jvms()->depth(), nfields);
1217 sobj->init_req(0, C->root());
1218 transform_later(sobj);
1219
1220 if (res == nullptr) {
1221 sfpt->jvms()->set_endoff(sfpt->req());
1222 return sobj;
1223 }
1224
1225 bool success;
1226 if (iklass == nullptr) {
1227 success = add_array_elems_to_safepoint(alloc, res_type->is_aryptr(), sfpt, value_worklist);
1228 } else {
1229 success = add_inst_fields_to_safepoint(iklass, alloc, res, 0, sfpt, value_worklist);
1230 }
1231
1232 // We weren't able to find a value for this field, remove all the fields added to the safepoint
1233 if (!success) {
1234 for (uint i = sfpt->req() - 1; i >= before_sfpt_req; i--) {
1235 sfpt->del_req(i);
1236 }
1237 _igvn._worklist.push(sfpt);
1238 return nullptr;
1239 }
1240
1241 sfpt->jvms()->set_endoff(sfpt->req());
1242 return sobj;
1243 }
1244
1245 // Do scalar replacement.
1246 bool PhaseMacroExpand::scalar_replacement(AllocateNode* alloc, GrowableArray<SafePointNode*>& safepoints) {
1247 GrowableArray<SafePointNode*> safepoints_done;
1248 Node* res = alloc->result_cast();
1249 assert(res == nullptr || res->is_CheckCastPP(), "unexpected AllocateNode result");
1250 const TypeOopPtr* res_type = nullptr;
1251 if (res != nullptr) { // Could be null when there are no users
1252 res_type = _igvn.type(res)->isa_oopptr();
1253 }
1254
1255 // Process the safepoint uses
1256 Unique_Node_List value_worklist;
1257 while (safepoints.length() > 0) {
1258 SafePointNode* sfpt = safepoints.pop();
1259
1260 SafePointNode::NodeEdgeTempStorage non_debug_edges_worklist(igvn());
1261
1262 // All sfpt inputs are implicitly included into debug info during the scalarization process below.
1263 // Keep non-debug inputs separately, so they stay non-debug.
1264 sfpt->remove_non_debug_edges(non_debug_edges_worklist);
1265
1266 SafePointScalarObjectNode* sobj = create_scalarized_object_description(alloc, sfpt, &value_worklist);
1267
1268 if (sobj == nullptr) {
1269 sfpt->restore_non_debug_edges(non_debug_edges_worklist);
1270 undo_previous_scalarizations(safepoints_done, alloc);
1271 return false;
1272 }
1273
1274 // Now make a pass over the debug information replacing any references
1275 // to the allocated object with "sobj"
1276 JVMState *jvms = sfpt->jvms();
1277 sfpt->replace_edges_in_range(res, sobj, jvms->debug_start(), jvms->debug_end(), &_igvn);
1278 non_debug_edges_worklist.remove_edge_if_present(res); // drop scalarized input from non-debug info
1279 sfpt->restore_non_debug_edges(non_debug_edges_worklist);
1280 _igvn._worklist.push(sfpt);
1281
1282 // keep it for rollback
1283 safepoints_done.append_if_missing(sfpt);
1284 }
1285 // Scalarize inline types that were added to the safepoint.
1286 // Don't allow linking a constant oop (if available) for flat array elements
1287 // because Deoptimization::reassign_flat_array_elements needs field values.
1288 bool allow_oop = (res_type != nullptr) && !res_type->is_flat();
1289 for (uint i = 0; i < value_worklist.size(); ++i) {
1290 InlineTypeNode* vt = value_worklist.at(i)->as_InlineType();
1291 vt->make_scalar_in_safepoints(&_igvn, allow_oop);
1292 }
1293 return true;
1294 }
1295
1296 static void disconnect_projections(MultiNode* n, PhaseIterGVN& igvn) {
1297 Node* ctl_proj = n->proj_out_or_null(TypeFunc::Control);
1298 Node* mem_proj = n->proj_out_or_null(TypeFunc::Memory);
1299 if (ctl_proj != nullptr) {
1300 igvn.replace_node(ctl_proj, n->in(0));
1301 }
1302 if (mem_proj != nullptr) {
1303 igvn.replace_node(mem_proj, n->in(TypeFunc::Memory));
1304 }
1305 }
1306
1307 // Process users of eliminated allocation.
1308 void PhaseMacroExpand::process_users_of_allocation(CallNode *alloc, bool inline_alloc) {
1309 Unique_Node_List worklist;
1310 Node* res = alloc->result_cast();
1311 if (res != nullptr) {
1312 worklist.push(res);
1313 }
1314 while (worklist.size() > 0) {
1315 res = worklist.pop();
1316 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) {
1317 Node *use = res->last_out(j);
1318 uint oc1 = res->outcnt();
1319
1320 if (use->is_AddP()) {
1321 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) {
1322 Node *n = use->last_out(k);
1323 uint oc2 = use->outcnt();
1324 if (n->is_Store()) {
1325 for (DUIterator_Fast pmax, p = n->fast_outs(pmax); p < pmax; p++) {
1326 MemBarNode* mb = n->fast_out(p)->isa_MemBar();
1327 if (mb != nullptr && mb->req() <= MemBarNode::Precedent && mb->in(MemBarNode::Precedent) == n) {
1328 // MemBarVolatiles should have been removed by MemBarNode::Ideal() for non-inline allocations
1329 assert(inline_alloc, "MemBarVolatile should be eliminated for non-escaping object");
1330 mb->remove(&_igvn);
1331 }
1332 }
1333 _igvn.replace_node(n, n->in(MemNode::Memory));
1334 } else {
1335 eliminate_gc_barrier(n);
1336 }
1337 k -= (oc2 - use->outcnt());
1338 }
1339 _igvn.remove_dead_node(use, PhaseIterGVN::NodeOrigin::Graph);
1340 } else if (use->is_ArrayCopy()) {
1341 // Disconnect ArrayCopy node
1342 ArrayCopyNode* ac = use->as_ArrayCopy();
1343 if (ac->is_clonebasic()) {
1344 Node* membar_after = ac->proj_out(TypeFunc::Control)->unique_ctrl_out();
1345 disconnect_projections(ac, _igvn);
1346 assert(alloc->in(TypeFunc::Memory)->is_Proj() && alloc->in(TypeFunc::Memory)->in(0)->Opcode() == Op_MemBarCPUOrder, "mem barrier expected before allocation");
1347 Node* membar_before = alloc->in(TypeFunc::Memory)->in(0);
1348 disconnect_projections(membar_before->as_MemBar(), _igvn);
1349 if (membar_after->is_MemBar()) {
1350 disconnect_projections(membar_after->as_MemBar(), _igvn);
1351 }
1352 } else {
1353 assert(ac->is_arraycopy_validated() ||
1354 ac->is_copyof_validated() ||
1355 ac->is_copyofrange_validated(), "unsupported");
1356 CallProjections* callprojs = ac->extract_projections(true);
1357
1358 _igvn.replace_node(callprojs->fallthrough_ioproj, ac->in(TypeFunc::I_O));
1359 _igvn.replace_node(callprojs->fallthrough_memproj, ac->in(TypeFunc::Memory));
1360 _igvn.replace_node(callprojs->fallthrough_catchproj, ac->in(TypeFunc::Control));
1361
1362 // Set control to top. IGVN will remove the remaining projections
1363 ac->set_req(0, top());
1364 ac->replace_edge(res, top(), &_igvn);
1365
1366 // Disconnect src right away: it can help find new
1367 // opportunities for allocation elimination
1368 Node* src = ac->in(ArrayCopyNode::Src);
1369 ac->replace_edge(src, top(), &_igvn);
1370 // src can be top at this point if src and dest of the
1371 // arraycopy were the same
1372 if (src->outcnt() == 0 && !src->is_top()) {
1373 _igvn.remove_dead_node(src, PhaseIterGVN::NodeOrigin::Graph);
1374 }
1375 }
1376 _igvn._worklist.push(ac);
1377 } else if (use->is_InlineType()) {
1378 assert(use->as_InlineType()->get_oop() == res, "unexpected inline type ptr use");
1379 // Cut off oop input and remove known instance id from type
1380 _igvn.rehash_node_delayed(use);
1381 use->as_InlineType()->set_oop(_igvn, _igvn.zerocon(T_OBJECT));
1382 use->as_InlineType()->set_is_buffered(_igvn, false);
1383 const TypeOopPtr* toop = _igvn.type(use)->is_oopptr()->cast_to_instance_id(TypeOopPtr::InstanceBot);
1384 _igvn.set_type(use, toop);
1385 use->as_InlineType()->set_type(toop);
1386 // Process users
1387 for (DUIterator_Fast kmax, k = use->fast_outs(kmax); k < kmax; k++) {
1388 Node* u = use->fast_out(k);
1389 if (!u->is_InlineType() && !u->is_StoreFlat()) {
1390 worklist.push(u);
1391 }
1392 }
1393 } else if (use->Opcode() == Op_StoreX && use->in(MemNode::Address) == res) {
1394 // Store to mark word of inline type larval buffer
1395 assert(inline_alloc, "Unexpected store to mark word");
1396 _igvn.replace_node(use, use->in(MemNode::Memory));
1397 } else if (use->Opcode() == Op_MemBarRelease || use->Opcode() == Op_MemBarStoreStore) {
1398 // Inline type buffer allocations are followed by a membar
1399 assert(inline_alloc, "Unexpected MemBarRelease");
1400 use->as_MemBar()->remove(&_igvn);
1401 } else if (use->is_ReachabilityFence() && OptimizeReachabilityFences) {
1402 use->as_ReachabilityFence()->clear_referent(_igvn); // redundant fence; will be removed during IGVN
1403 } else {
1404 eliminate_gc_barrier(use);
1405 }
1406 j -= (oc1 - res->outcnt());
1407 }
1408 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted");
1409 _igvn.remove_dead_node(res, PhaseIterGVN::NodeOrigin::Graph);
1410 }
1411
1412 //
1413 // Process other users of allocation's projections
1414 //
1415 if (_callprojs->resproj[0] != nullptr && _callprojs->resproj[0]->outcnt() != 0) {
1416 // First disconnect stores captured by Initialize node.
1417 // If Initialize node is eliminated first in the following code,
1418 // it will kill such stores and DUIterator_Last will assert.
1419 for (DUIterator_Fast jmax, j = _callprojs->resproj[0]->fast_outs(jmax); j < jmax; j++) {
1420 Node* use = _callprojs->resproj[0]->fast_out(j);
1421 if (use->is_AddP()) {
1422 // raw memory addresses used only by the initialization
1423 _igvn.replace_node(use, C->top());
1424 --j; --jmax;
1425 }
1426 }
1427 for (DUIterator_Last jmin, j = _callprojs->resproj[0]->last_outs(jmin); j >= jmin; ) {
1428 Node* use = _callprojs->resproj[0]->last_out(j);
1429 uint oc1 = _callprojs->resproj[0]->outcnt();
1430 if (use->is_Initialize()) {
1431 // Eliminate Initialize node.
1432 InitializeNode *init = use->as_Initialize();
1433 Node *ctrl_proj = init->proj_out_or_null(TypeFunc::Control);
1434 if (ctrl_proj != nullptr) {
1435 _igvn.replace_node(ctrl_proj, init->in(TypeFunc::Control));
1436 #ifdef ASSERT
1437 // If the InitializeNode has no memory out, it will die, and tmp will become null
1438 Node* tmp = init->in(TypeFunc::Control);
1439 assert(tmp == nullptr || tmp == _callprojs->fallthrough_catchproj, "allocation control projection");
1440 #endif
1441 }
1442 Node* mem = init->in(TypeFunc::Memory);
1443 #ifdef ASSERT
1444 if (init->number_of_projs(TypeFunc::Memory) > 0) {
1445 if (mem->is_MergeMem()) {
1446 assert(mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw) == _callprojs->fallthrough_memproj, "allocation memory projection");
1447 } else {
1448 assert(mem == _callprojs->fallthrough_memproj, "allocation memory projection");
1449 }
1450 }
1451 #endif
1452 init->replace_mem_projs_by(mem, &_igvn);
1453 assert(init->outcnt() == 0, "should only have had a control and some memory projections, and we removed them");
1454 } else if (use->Opcode() == Op_MemBarStoreStore) {
1455 // Inline type buffer allocations are followed by a membar
1456 assert(inline_alloc, "Unexpected MemBarStoreStore");
1457 use->as_MemBar()->remove(&_igvn);
1458 } else {
1459 assert(false, "only Initialize or AddP expected");
1460 }
1461 j -= (oc1 - _callprojs->resproj[0]->outcnt());
1462 }
1463 }
1464 if (_callprojs->fallthrough_catchproj != nullptr) {
1465 _igvn.replace_node(_callprojs->fallthrough_catchproj, alloc->in(TypeFunc::Control));
1466 }
1467 if (_callprojs->fallthrough_memproj != nullptr) {
1468 _igvn.replace_node(_callprojs->fallthrough_memproj, alloc->in(TypeFunc::Memory));
1469 }
1470 if (_callprojs->catchall_memproj != nullptr) {
1471 _igvn.replace_node(_callprojs->catchall_memproj, C->top());
1472 }
1473 if (_callprojs->fallthrough_ioproj != nullptr) {
1474 _igvn.replace_node(_callprojs->fallthrough_ioproj, alloc->in(TypeFunc::I_O));
1475 }
1476 if (_callprojs->catchall_ioproj != nullptr) {
1477 _igvn.replace_node(_callprojs->catchall_ioproj, C->top());
1478 }
1479 if (_callprojs->catchall_catchproj != nullptr) {
1480 _igvn.replace_node(_callprojs->catchall_catchproj, C->top());
1481 }
1482 }
1483
1484 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) {
1485 // If reallocation fails during deoptimization we'll pop all
1486 // interpreter frames for this compiled frame and that won't play
1487 // nice with JVMTI popframe.
1488 // We avoid this issue by eager reallocation when the popframe request
1489 // is received.
1490 if (!EliminateAllocations) {
1491 return false;
1492 }
1493 Node* klass = alloc->in(AllocateNode::KlassNode);
1494 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr();
1495
1496 // Attempt to eliminate inline type buffer allocations
1497 // regardless of usage and escape/replaceable status.
1498 bool inline_alloc = tklass->isa_instklassptr() &&
1499 tklass->is_instklassptr()->instance_klass()->is_inlinetype();
1500 if (!alloc->_is_non_escaping && !inline_alloc) {
1501 return false;
1502 }
1503 // Eliminate boxing allocations which are not used
1504 // regardless scalar replaceable status.
1505 Node* res = alloc->result_cast();
1506 bool boxing_alloc = (res == nullptr) && C->eliminate_boxing() &&
1507 tklass->isa_instklassptr() &&
1508 tklass->is_instklassptr()->instance_klass()->is_box_klass();
1509 if (!alloc->_is_scalar_replaceable && !boxing_alloc && !inline_alloc) {
1510 return false;
1511 }
1512
1513 _callprojs = alloc->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1514
1515 GrowableArray <SafePointNode *> safepoints;
1516 if (!can_eliminate_allocation(&_igvn, alloc, &safepoints)) {
1517 return false;
1518 }
1519
1520 if (!alloc->_is_scalar_replaceable) {
1521 assert(res == nullptr || inline_alloc, "sanity");
1522 // We can only eliminate allocation if all debug info references
1523 // are already replaced with SafePointScalarObject because
1524 // we can't search for a fields value without instance_id.
1525 if (safepoints.length() > 0) {
1526 return false;
1527 }
1528 }
1529
1530 if (!scalar_replacement(alloc, safepoints)) {
1531 return false;
1532 }
1533
1534 CompileLog* log = C->log();
1535 if (log != nullptr) {
1536 log->head("eliminate_allocation type='%d'",
1537 log->identify(tklass->exact_klass()));
1538 JVMState* p = alloc->jvms();
1539 while (p != nullptr) {
1540 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1541 p = p->caller();
1542 }
1543 log->tail("eliminate_allocation");
1544 }
1545
1546 process_users_of_allocation(alloc, inline_alloc);
1547
1548 #ifndef PRODUCT
1549 if (PrintEliminateAllocations) {
1550 if (alloc->is_AllocateArray())
1551 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1552 else
1553 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1554 }
1555 #endif
1556
1557 return true;
1558 }
1559
1560 bool PhaseMacroExpand::eliminate_boxing_node(CallStaticJavaNode *boxing) {
1561 // EA should remove all uses of non-escaping boxing node.
1562 if (!C->eliminate_boxing() || boxing->proj_out_or_null(TypeFunc::Parms) != nullptr) {
1563 return false;
1564 }
1565
1566 assert(boxing->result_cast() == nullptr, "unexpected boxing node result");
1567
1568 _callprojs = boxing->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1569
1570 const TypeTuple* r = boxing->tf()->range_sig();
1571 assert(r->cnt() > TypeFunc::Parms, "sanity");
1572 const TypeInstPtr* t = r->field_at(TypeFunc::Parms)->isa_instptr();
1573 assert(t != nullptr, "sanity");
1574
1575 CompileLog* log = C->log();
1576 if (log != nullptr) {
1577 log->head("eliminate_boxing type='%d'",
1578 log->identify(t->instance_klass()));
1579 JVMState* p = boxing->jvms();
1580 while (p != nullptr) {
1581 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1582 p = p->caller();
1583 }
1584 log->tail("eliminate_boxing");
1585 }
1586
1587 process_users_of_allocation(boxing);
1588
1589 #ifndef PRODUCT
1590 if (PrintEliminateAllocations) {
1654 // oop flavor.
1655 //
1656 //=============================================================================
1657 // FastAllocateSizeLimit value is in DOUBLEWORDS.
1658 // Allocations bigger than this always go the slow route.
1659 // This value must be small enough that allocation attempts that need to
1660 // trigger exceptions go the slow route. Also, it must be small enough so
1661 // that heap_top + size_in_bytes does not wrap around the 4Gig limit.
1662 //=============================================================================j//
1663 // %%% Here is an old comment from parseHelper.cpp; is it outdated?
1664 // The allocator will coalesce int->oop copies away. See comment in
1665 // coalesce.cpp about how this works. It depends critically on the exact
1666 // code shape produced here, so if you are changing this code shape
1667 // make sure the GC info for the heap-top is correct in and around the
1668 // slow-path call.
1669 //
1670
1671 void PhaseMacroExpand::expand_allocate_common(
1672 AllocateNode* alloc, // allocation node to be expanded
1673 Node* length, // array length for an array allocation
1674 Node* init_val, // value to initialize the array with
1675 const TypeFunc* slow_call_type, // Type of slow call
1676 address slow_call_address, // Address of slow call
1677 Node* valid_length_test // whether length is valid or not
1678 )
1679 {
1680 Node* ctrl = alloc->in(TypeFunc::Control);
1681 Node* mem = alloc->in(TypeFunc::Memory);
1682 Node* i_o = alloc->in(TypeFunc::I_O);
1683 Node* size_in_bytes = alloc->in(AllocateNode::AllocSize);
1684 Node* klass_node = alloc->in(AllocateNode::KlassNode);
1685 Node* initial_slow_test = alloc->in(AllocateNode::InitialTest);
1686 assert(ctrl != nullptr, "must have control");
1687
1688 // We need a Region and corresponding Phi's to merge the slow-path and fast-path results.
1689 // they will not be used if "always_slow" is set
1690 enum { slow_result_path = 1, fast_result_path = 2 };
1691 Node *result_region = nullptr;
1692 Node *result_phi_rawmem = nullptr;
1693 Node *result_phi_rawoop = nullptr;
1694 Node *result_phi_i_o = nullptr;
1739 #endif
1740 yank_alloc_node(alloc);
1741 return;
1742 }
1743 }
1744
1745 enum { too_big_or_final_path = 1, need_gc_path = 2 };
1746 Node *slow_region = nullptr;
1747 Node *toobig_false = ctrl;
1748
1749 // generate the initial test if necessary
1750 if (initial_slow_test != nullptr ) {
1751 assert (expand_fast_path, "Only need test if there is a fast path");
1752 slow_region = new RegionNode(3);
1753
1754 // Now make the initial failure test. Usually a too-big test but
1755 // might be a TRUE for finalizers.
1756 IfNode *toobig_iff = new IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN);
1757 transform_later(toobig_iff);
1758 // Plug the failing-too-big test into the slow-path region
1759 Node* toobig_true = new IfTrueNode(toobig_iff);
1760 transform_later(toobig_true);
1761 slow_region ->init_req( too_big_or_final_path, toobig_true );
1762 toobig_false = new IfFalseNode(toobig_iff);
1763 transform_later(toobig_false);
1764 } else {
1765 // No initial test, just fall into next case
1766 assert(allocation_has_use || !expand_fast_path, "Should already have been handled");
1767 toobig_false = ctrl;
1768 DEBUG_ONLY(slow_region = NodeSentinel);
1769 }
1770
1771 // If we are here there are several possibilities
1772 // - expand_fast_path is false - then only a slow path is expanded. That's it.
1773 // no_initial_check means a constant allocation.
1774 // - If check always evaluates to false -> expand_fast_path is false (see above)
1775 // - If check always evaluates to true -> directly into fast path (but may bailout to slowpath)
1776 // if !allocation_has_use the fast path is empty
1777 // if !allocation_has_use && no_initial_check
1778 // - Then there are no fastpath that can fall out to slowpath -> no allocation code at all.
1779 // removed by yank_alloc_node above.
1780
1781 Node *slow_mem = mem; // save the current memory state for slow path
1782 // generate the fast allocation code unless we know that the initial test will always go slow
1783 if (expand_fast_path) {
1784 // Fast path modifies only raw memory.
1785 if (mem->is_MergeMem()) {
1786 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
1787 }
1788
1789 // allocate the Region and Phi nodes for the result
1790 result_region = new RegionNode(3);
1791 result_phi_rawmem = new PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM);
1792 result_phi_i_o = new PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch
1793
1794 // Grab regular I/O before optional prefetch may change it.
1795 // Slow-path does no I/O so just set it to the original I/O.
1796 result_phi_i_o->init_req(slow_result_path, i_o);
1797
1798 // Name successful fast-path variables
1799 Node* fast_oop_ctrl;
1800 Node* fast_oop_rawmem;
1801
1802 if (allocation_has_use) {
1803 Node* needgc_ctrl = nullptr;
1804 result_phi_rawoop = new PhiNode(result_region, TypeRawPtr::BOTTOM);
1805
1806 intx prefetch_lines = length != nullptr ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
1807 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1808 Node* fast_oop = bs->obj_allocate(this, mem, toobig_false, size_in_bytes, i_o, needgc_ctrl,
1809 fast_oop_ctrl, fast_oop_rawmem,
1810 prefetch_lines);
1811
1812 if (initial_slow_test != nullptr) {
1813 // This completes all paths into the slow merge point
1814 slow_region->init_req(need_gc_path, needgc_ctrl);
1815 transform_later(slow_region);
1816 } else {
1817 // No initial slow path needed!
1818 // Just fall from the need-GC path straight into the VM call.
1819 slow_region = needgc_ctrl;
1820 }
1821
1839 result_phi_i_o ->init_req(fast_result_path, i_o);
1840 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem);
1841 } else {
1842 slow_region = ctrl;
1843 result_phi_i_o = i_o; // Rename it to use in the following code.
1844 }
1845
1846 // Generate slow-path call
1847 CallNode *call = new CallStaticJavaNode(slow_call_type, slow_call_address,
1848 OptoRuntime::stub_name(slow_call_address),
1849 TypePtr::BOTTOM);
1850 call->init_req(TypeFunc::Control, slow_region);
1851 call->init_req(TypeFunc::I_O, top()); // does no i/o
1852 call->init_req(TypeFunc::Memory, slow_mem); // may gc ptrs
1853 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1854 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1855
1856 call->init_req(TypeFunc::Parms+0, klass_node);
1857 if (length != nullptr) {
1858 call->init_req(TypeFunc::Parms+1, length);
1859 if (init_val != nullptr) {
1860 call->init_req(TypeFunc::Parms+2, init_val);
1861 }
1862 }
1863
1864 // Copy debug information and adjust JVMState information, then replace
1865 // allocate node with the call
1866 call->copy_call_debug_info(&_igvn, alloc);
1867 // For array allocations, copy the valid length check to the call node so Compile::final_graph_reshaping() can verify
1868 // that the call has the expected number of CatchProj nodes (in case the allocation always fails and the fallthrough
1869 // path dies).
1870 if (valid_length_test != nullptr) {
1871 call->add_req(valid_length_test);
1872 }
1873 if (expand_fast_path) {
1874 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
1875 } else {
1876 // Hook i_o projection to avoid its elimination during allocation
1877 // replacement (when only a slow call is generated).
1878 call->set_req(TypeFunc::I_O, result_phi_i_o);
1879 }
1880 _igvn.replace_node(alloc, call);
1881 transform_later(call);
1882
1883 // Identify the output projections from the allocate node and
1884 // adjust any references to them.
1885 // The control and io projections look like:
1886 //
1887 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl)
1888 // Allocate Catch
1889 // ^---Proj(io) <-------+ ^---CatchProj(io)
1890 //
1891 // We are interested in the CatchProj nodes.
1892 //
1893 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1894
1895 // An allocate node has separate memory projections for the uses on
1896 // the control and i_o paths. Replace the control memory projection with
1897 // result_phi_rawmem (unless we are only generating a slow call when
1898 // both memory projections are combined)
1899 if (expand_fast_path && _callprojs->fallthrough_memproj != nullptr) {
1900 _igvn.replace_in_uses(_callprojs->fallthrough_memproj, result_phi_rawmem);
1901 }
1902 // Now change uses of catchall_memproj to use fallthrough_memproj and delete
1903 // catchall_memproj so we end up with a call that has only 1 memory projection.
1904 if (_callprojs->catchall_memproj != nullptr) {
1905 if (_callprojs->fallthrough_memproj == nullptr) {
1906 _callprojs->fallthrough_memproj = new ProjNode(call, TypeFunc::Memory);
1907 transform_later(_callprojs->fallthrough_memproj);
1908 }
1909 _igvn.replace_in_uses(_callprojs->catchall_memproj, _callprojs->fallthrough_memproj);
1910 _igvn.remove_dead_node(_callprojs->catchall_memproj, PhaseIterGVN::NodeOrigin::Graph);
1911 }
1912
1913 // An allocate node has separate i_o projections for the uses on the control
1914 // and i_o paths. Always replace the control i_o projection with result i_o
1915 // otherwise incoming i_o become dead when only a slow call is generated
1916 // (it is different from memory projections where both projections are
1917 // combined in such case).
1918 if (_callprojs->fallthrough_ioproj != nullptr) {
1919 _igvn.replace_in_uses(_callprojs->fallthrough_ioproj, result_phi_i_o);
1920 }
1921 // Now change uses of catchall_ioproj to use fallthrough_ioproj and delete
1922 // catchall_ioproj so we end up with a call that has only 1 i_o projection.
1923 if (_callprojs->catchall_ioproj != nullptr) {
1924 if (_callprojs->fallthrough_ioproj == nullptr) {
1925 _callprojs->fallthrough_ioproj = new ProjNode(call, TypeFunc::I_O);
1926 transform_later(_callprojs->fallthrough_ioproj);
1927 }
1928 _igvn.replace_in_uses(_callprojs->catchall_ioproj, _callprojs->fallthrough_ioproj);
1929 _igvn.remove_dead_node(_callprojs->catchall_ioproj, PhaseIterGVN::NodeOrigin::Graph);
1930 }
1931
1932 // if we generated only a slow call, we are done
1933 if (!expand_fast_path) {
1934 // Now we can unhook i_o.
1935 if (result_phi_i_o->outcnt() > 1) {
1936 call->set_req(TypeFunc::I_O, top());
1937 } else {
1938 assert(result_phi_i_o->unique_ctrl_out() == call, "sanity");
1939 // Case of new array with negative size known during compilation.
1940 // AllocateArrayNode::Ideal() optimization disconnect unreachable
1941 // following code since call to runtime will throw exception.
1942 // As result there will be no users of i_o after the call.
1943 // Leave i_o attached to this call to avoid problems in preceding graph.
1944 }
1945 return;
1946 }
1947
1948 if (_callprojs->fallthrough_catchproj != nullptr) {
1949 ctrl = _callprojs->fallthrough_catchproj->clone();
1950 transform_later(ctrl);
1951 _igvn.replace_node(_callprojs->fallthrough_catchproj, result_region);
1952 } else {
1953 ctrl = top();
1954 }
1955 Node *slow_result;
1956 if (_callprojs->resproj[0] == nullptr) {
1957 // no uses of the allocation result
1958 slow_result = top();
1959 } else {
1960 slow_result = _callprojs->resproj[0]->clone();
1961 transform_later(slow_result);
1962 _igvn.replace_node(_callprojs->resproj[0], result_phi_rawoop);
1963 }
1964
1965 // Plug slow-path into result merge point
1966 result_region->init_req( slow_result_path, ctrl);
1967 transform_later(result_region);
1968 if (allocation_has_use) {
1969 result_phi_rawoop->init_req(slow_result_path, slow_result);
1970 transform_later(result_phi_rawoop);
1971 }
1972 result_phi_rawmem->init_req(slow_result_path, _callprojs->fallthrough_memproj);
1973 transform_later(result_phi_rawmem);
1974 transform_later(result_phi_i_o);
1975 // This completes all paths into the result merge point
1976 }
1977
1978 // Remove alloc node that has no uses.
1979 void PhaseMacroExpand::yank_alloc_node(AllocateNode* alloc) {
1980 Node* ctrl = alloc->in(TypeFunc::Control);
1981 Node* mem = alloc->in(TypeFunc::Memory);
1982 Node* i_o = alloc->in(TypeFunc::I_O);
1983
1984 _callprojs = alloc->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1985 if (_callprojs->resproj[0] != nullptr) {
1986 for (DUIterator_Fast imax, i = _callprojs->resproj[0]->fast_outs(imax); i < imax; i++) {
1987 Node* use = _callprojs->resproj[0]->fast_out(i);
1988 use->isa_MemBar()->remove(&_igvn);
1989 --imax;
1990 --i; // back up iterator
1991 }
1992 assert(_callprojs->resproj[0]->outcnt() == 0, "all uses must be deleted");
1993 _igvn.remove_dead_node(_callprojs->resproj[0], PhaseIterGVN::NodeOrigin::Graph);
1994 }
1995 if (_callprojs->fallthrough_catchproj != nullptr) {
1996 _igvn.replace_in_uses(_callprojs->fallthrough_catchproj, ctrl);
1997 _igvn.remove_dead_node(_callprojs->fallthrough_catchproj, PhaseIterGVN::NodeOrigin::Graph);
1998 }
1999 if (_callprojs->catchall_catchproj != nullptr) {
2000 _igvn.rehash_node_delayed(_callprojs->catchall_catchproj);
2001 _callprojs->catchall_catchproj->set_req(0, top());
2002 }
2003 if (_callprojs->fallthrough_proj != nullptr) {
2004 Node* catchnode = _callprojs->fallthrough_proj->unique_ctrl_out();
2005 _igvn.remove_dead_node(catchnode, PhaseIterGVN::NodeOrigin::Graph);
2006 _igvn.remove_dead_node(_callprojs->fallthrough_proj, PhaseIterGVN::NodeOrigin::Graph);
2007 }
2008 if (_callprojs->fallthrough_memproj != nullptr) {
2009 _igvn.replace_in_uses(_callprojs->fallthrough_memproj, mem);
2010 _igvn.remove_dead_node(_callprojs->fallthrough_memproj, PhaseIterGVN::NodeOrigin::Graph);
2011 }
2012 if (_callprojs->fallthrough_ioproj != nullptr) {
2013 _igvn.replace_in_uses(_callprojs->fallthrough_ioproj, i_o);
2014 _igvn.remove_dead_node(_callprojs->fallthrough_ioproj, PhaseIterGVN::NodeOrigin::Graph);
2015 }
2016 if (_callprojs->catchall_memproj != nullptr) {
2017 _igvn.rehash_node_delayed(_callprojs->catchall_memproj);
2018 _callprojs->catchall_memproj->set_req(0, top());
2019 }
2020 if (_callprojs->catchall_ioproj != nullptr) {
2021 _igvn.rehash_node_delayed(_callprojs->catchall_ioproj);
2022 _callprojs->catchall_ioproj->set_req(0, top());
2023 }
2024 #ifndef PRODUCT
2025 if (PrintEliminateAllocations) {
2026 if (alloc->is_AllocateArray()) {
2027 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
2028 } else {
2029 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
2030 }
2031 }
2032 #endif
2033 _igvn.remove_dead_node(alloc, PhaseIterGVN::NodeOrigin::Graph);
2034 }
2035
2036 void PhaseMacroExpand::expand_initialize_membar(AllocateNode* alloc, InitializeNode* init,
2037 Node*& fast_oop_ctrl, Node*& fast_oop_rawmem) {
2038 // If initialization is performed by an array copy, any required
2039 // MemBarStoreStore was already added. If the object does not
2040 // escape no need for a MemBarStoreStore. If the object does not
2041 // escape in its initializer and memory barrier (MemBarStoreStore or
2042 // stronger) is already added at exit of initializer, also no need
2136 Node* thread = new ThreadLocalNode();
2137 transform_later(thread);
2138
2139 call->init_req(TypeFunc::Parms + 0, thread);
2140 call->init_req(TypeFunc::Parms + 1, oop);
2141 call->init_req(TypeFunc::Control, ctrl);
2142 call->init_req(TypeFunc::I_O , top()); // does no i/o
2143 call->init_req(TypeFunc::Memory , rawmem);
2144 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
2145 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
2146 transform_later(call);
2147 ctrl = new ProjNode(call, TypeFunc::Control);
2148 transform_later(ctrl);
2149 rawmem = new ProjNode(call, TypeFunc::Memory);
2150 transform_later(rawmem);
2151 }
2152 }
2153
2154 // Helper for PhaseMacroExpand::expand_allocate_common.
2155 // Initializes the newly-allocated storage.
2156 Node* PhaseMacroExpand::initialize_object(AllocateNode* alloc,
2157 Node* control, Node* rawmem, Node* object,
2158 Node* klass_node, Node* length,
2159 Node* size_in_bytes) {
2160 InitializeNode* init = alloc->initialization();
2161 // Store the klass & mark bits
2162 Node* mark_node = alloc->make_ideal_mark(&_igvn, control, rawmem);
2163 if (!mark_node->is_Con()) {
2164 transform_later(mark_node);
2165 }
2166 rawmem = make_store_raw(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, TypeX_X->basic_type());
2167
2168 if (!UseCompactObjectHeaders) {
2169 rawmem = make_store_raw(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
2170 }
2171 int header_size = alloc->minimum_header_size(); // conservatively small
2172
2173 // Array length
2174 if (length != nullptr) { // Arrays need length field
2175 rawmem = make_store_raw(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
2176 // conservatively small header size:
2177 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE);
2178 if (_igvn.type(klass_node)->isa_aryklassptr()) { // we know the exact header size in most cases:
2179 BasicType elem = _igvn.type(klass_node)->is_klassptr()->as_instance_type()->isa_aryptr()->elem()->array_element_basic_type();
2180 if (is_reference_type(elem, true)) {
2181 elem = T_OBJECT;
2182 }
2183 header_size = Klass::layout_helper_header_size(Klass::array_layout_helper(elem));
2184 }
2185 }
2186
2187 // Clear the object body, if necessary.
2188 if (init == nullptr) {
2189 // The init has somehow disappeared; be cautious and clear everything.
2190 //
2191 // This can happen if a node is allocated but an uncommon trap occurs
2192 // immediately. In this case, the Initialize gets associated with the
2193 // trap, and may be placed in a different (outer) loop, if the Allocate
2194 // is in a loop. If (this is rare) the inner loop gets unrolled, then
2195 // there can be two Allocates to one Initialize. The answer in all these
2196 // edge cases is safety first. It is always safe to clear immediately
2197 // within an Allocate, and then (maybe or maybe not) clear some more later.
2198 if (!(UseTLAB && ZeroTLAB)) {
2199 rawmem = ClearArrayNode::clear_memory(control, rawmem, object,
2200 alloc->in(AllocateNode::InitValue),
2201 alloc->in(AllocateNode::RawInitValue),
2202 header_size, size_in_bytes,
2203 true,
2204 &_igvn);
2205 }
2206 } else {
2207 if (!init->is_complete()) {
2208 // Try to win by zeroing only what the init does not store.
2209 // We can also try to do some peephole optimizations,
2210 // such as combining some adjacent subword stores.
2211 rawmem = init->complete_stores(control, rawmem, object,
2212 header_size, size_in_bytes, &_igvn);
2213 }
2214 // We have no more use for this link, since the AllocateNode goes away:
2215 init->set_req(InitializeNode::RawAddress, top());
2216 // (If we keep the link, it just confuses the register allocator,
2217 // who thinks he sees a real use of the address by the membar.)
2218 }
2219
2220 return rawmem;
2221 }
2356 for (intx i = 0; i < lines; i++) {
2357 prefetch_adr = AddPNode::make_off_heap(new_eden_top,
2358 _igvn.MakeConX(distance));
2359 transform_later(prefetch_adr);
2360 prefetch = new PrefetchAllocationNode(i_o, prefetch_adr);
2361 // Do not let it float too high, since if eden_top == eden_end,
2362 // both might be null.
2363 if (i == 0) { // Set control for first prefetch, next follows it
2364 prefetch->init_req(0, needgc_false);
2365 }
2366 transform_later(prefetch);
2367 distance += step_size;
2368 i_o = prefetch;
2369 }
2370 }
2371 return i_o;
2372 }
2373
2374
2375 void PhaseMacroExpand::expand_allocate(AllocateNode *alloc) {
2376 expand_allocate_common(alloc, nullptr, nullptr,
2377 OptoRuntime::new_instance_Type(),
2378 OptoRuntime::new_instance_Java(), nullptr);
2379 }
2380
2381 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) {
2382 Node* length = alloc->in(AllocateNode::ALength);
2383 Node* valid_length_test = alloc->in(AllocateNode::ValidLengthTest);
2384 InitializeNode* init = alloc->initialization();
2385 Node* klass_node = alloc->in(AllocateNode::KlassNode);
2386 Node* init_value = alloc->in(AllocateNode::InitValue);
2387 const TypeAryKlassPtr* ary_klass_t = _igvn.type(klass_node)->isa_aryklassptr();
2388 assert(!ary_klass_t || !ary_klass_t->klass_is_exact() || !ary_klass_t->exact_klass()->is_obj_array_klass() ||
2389 ary_klass_t->is_refined_type(), "Must be a refined array klass");
2390 const TypeFunc* slow_call_type;
2391 address slow_call_address; // Address of slow call
2392 if (init != nullptr && init->is_complete_with_arraycopy() &&
2393 ary_klass_t && ary_klass_t->elem()->isa_klassptr() == nullptr) {
2394 // Don't zero type array during slow allocation in VM since
2395 // it will be initialized later by arraycopy in compiled code.
2396 slow_call_address = OptoRuntime::new_array_nozero_Java();
2397 slow_call_type = OptoRuntime::new_array_nozero_Type();
2398 } else {
2399 slow_call_address = OptoRuntime::new_array_Java();
2400 slow_call_type = OptoRuntime::new_array_Type();
2401
2402 if (init_value == nullptr) {
2403 init_value = _igvn.zerocon(T_OBJECT);
2404 } else if (UseCompressedOops) {
2405 init_value = transform_later(new DecodeNNode(init_value, init_value->bottom_type()->make_ptr()));
2406 }
2407 }
2408 expand_allocate_common(alloc, length, init_value,
2409 slow_call_type,
2410 slow_call_address, valid_length_test);
2411 }
2412
2413 //-------------------mark_eliminated_box----------------------------------
2414 //
2415 // During EA obj may point to several objects but after few ideal graph
2416 // transformations (CCP) it may point to only one non escaping object
2417 // (but still using phi), corresponding locks and unlocks will be marked
2418 // for elimination. Later obj could be replaced with a new node (new phi)
2419 // and which does not have escape information. And later after some graph
2420 // reshape other locks and unlocks (which were not marked for elimination
2421 // before) are connected to this new obj (phi) but they still will not be
2422 // marked for elimination since new obj has no escape information.
2423 // Mark all associated (same box and obj) lock and unlock nodes for
2424 // elimination if some of them marked already.
2425 void PhaseMacroExpand::mark_eliminated_box(Node* box, Node* obj) {
2426 BoxLockNode* oldbox = box->as_BoxLock();
2427 if (oldbox->is_eliminated()) {
2428 return; // This BoxLock node was processed already.
2429 }
2601 #ifdef ASSERT
2602 if (!alock->is_coarsened()) {
2603 // Check that new "eliminated" BoxLock node is created.
2604 BoxLockNode* oldbox = alock->box_node()->as_BoxLock();
2605 assert(oldbox->is_eliminated(), "should be done already");
2606 }
2607 #endif
2608
2609 alock->log_lock_optimization(C, "eliminate_lock");
2610
2611 #ifndef PRODUCT
2612 if (PrintEliminateLocks) {
2613 tty->print_cr("++++ Eliminated: %d %s '%s'", alock->_idx, (alock->is_Lock() ? "Lock" : "Unlock"), alock->kind_as_string());
2614 }
2615 #endif
2616
2617 Node* mem = alock->in(TypeFunc::Memory);
2618 Node* ctrl = alock->in(TypeFunc::Control);
2619 guarantee(ctrl != nullptr, "missing control projection, cannot replace_node() with null");
2620
2621 _callprojs = alock->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2622 // There are 2 projections from the lock. The lock node will
2623 // be deleted when its last use is subsumed below.
2624 assert(alock->outcnt() == 2 &&
2625 _callprojs->fallthrough_proj != nullptr &&
2626 _callprojs->fallthrough_memproj != nullptr,
2627 "Unexpected projections from Lock/Unlock");
2628
2629 Node* fallthroughproj = _callprojs->fallthrough_proj;
2630 Node* memproj_fallthrough = _callprojs->fallthrough_memproj;
2631
2632 // The memory projection from a lock/unlock is RawMem
2633 // The input to a Lock is merged memory, so extract its RawMem input
2634 // (unless the MergeMem has been optimized away.)
2635 if (alock->is_Lock()) {
2636 // Search for MemBarAcquireLock node and delete it also.
2637 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar();
2638 assert(membar != nullptr && membar->Opcode() == Op_MemBarAcquireLock, "");
2639 Node* ctrlproj = membar->proj_out(TypeFunc::Control);
2640 Node* memproj = membar->proj_out(TypeFunc::Memory);
2641 _igvn.replace_node(ctrlproj, fallthroughproj);
2642 _igvn.replace_node(memproj, memproj_fallthrough);
2643
2644 // Delete FastLock node also if this Lock node is unique user
2645 // (a loop peeling may clone a Lock node).
2646 Node* flock = alock->as_Lock()->fastlock_node();
2647 if (flock->outcnt() == 1) {
2648 assert(flock->unique_out() == alock, "sanity");
2649 _igvn.replace_node(flock, top());
2650 }
2681 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2682
2683 // Make the merge point
2684 Node *region;
2685 Node *mem_phi;
2686 Node *slow_path;
2687
2688 region = new RegionNode(3);
2689 // create a Phi for the memory state
2690 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2691
2692 // Optimize test; set region slot 2
2693 slow_path = opt_bits_test(ctrl, region, 2, flock);
2694 mem_phi->init_req(2, mem);
2695
2696 // Make slow path call
2697 CallNode* call = make_slow_call(lock, OptoRuntime::complete_monitor_enter_Type(),
2698 OptoRuntime::complete_monitor_locking_Java(), nullptr, slow_path,
2699 obj, box, nullptr);
2700
2701 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2702
2703 // Slow path can only throw asynchronous exceptions, which are always
2704 // de-opted. So the compiler thinks the slow-call can never throw an
2705 // exception. If it DOES throw an exception we would need the debug
2706 // info removed first (since if it throws there is no monitor).
2707 assert(_callprojs->fallthrough_ioproj == nullptr && _callprojs->catchall_ioproj == nullptr &&
2708 _callprojs->catchall_memproj == nullptr && _callprojs->catchall_catchproj == nullptr, "Unexpected projection from Lock");
2709
2710 // Capture slow path
2711 // disconnect fall-through projection from call and create a new one
2712 // hook up users of fall-through projection to region
2713 Node *slow_ctrl = _callprojs->fallthrough_proj->clone();
2714 transform_later(slow_ctrl);
2715 _igvn.hash_delete(_callprojs->fallthrough_proj);
2716 _callprojs->fallthrough_proj->disconnect_inputs(C);
2717 region->init_req(1, slow_ctrl);
2718 // region inputs are now complete
2719 transform_later(region);
2720 _igvn.replace_node(_callprojs->fallthrough_proj, region);
2721
2722 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2723
2724 mem_phi->init_req(1, memproj);
2725
2726 transform_later(mem_phi);
2727
2728 _igvn.replace_node(_callprojs->fallthrough_memproj, mem_phi);
2729 }
2730
2731 //------------------------------expand_unlock_node----------------------
2732 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {
2733
2734 Node* ctrl = unlock->in(TypeFunc::Control);
2735 Node* mem = unlock->in(TypeFunc::Memory);
2736 Node* obj = unlock->obj_node();
2737 Node* box = unlock->box_node();
2738
2739 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2740
2741 // No need for a null check on unlock
2742
2743 // Make the merge point
2744 Node* region = new RegionNode(3);
2745
2746 FastUnlockNode *funlock = new FastUnlockNode( ctrl, obj, box );
2747 funlock = transform_later( funlock )->as_FastUnlock();
2748 // Optimize test; set region slot 2
2749 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock);
2750 Node *thread = transform_later(new ThreadLocalNode());
2751
2752 CallNode *call = make_slow_call((CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(),
2753 CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C),
2754 "complete_monitor_unlocking_C", slow_path, obj, box, thread);
2755
2756 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2757 assert(_callprojs->fallthrough_ioproj == nullptr && _callprojs->catchall_ioproj == nullptr &&
2758 _callprojs->catchall_memproj == nullptr && _callprojs->catchall_catchproj == nullptr, "Unexpected projection from Lock");
2759
2760 // No exceptions for unlocking
2761 // Capture slow path
2762 // disconnect fall-through projection from call and create a new one
2763 // hook up users of fall-through projection to region
2764 Node *slow_ctrl = _callprojs->fallthrough_proj->clone();
2765 transform_later(slow_ctrl);
2766 _igvn.hash_delete(_callprojs->fallthrough_proj);
2767 _callprojs->fallthrough_proj->disconnect_inputs(C);
2768 region->init_req(1, slow_ctrl);
2769 // region inputs are now complete
2770 transform_later(region);
2771 _igvn.replace_node(_callprojs->fallthrough_proj, region);
2772
2773 if (_callprojs->fallthrough_memproj != nullptr) {
2774 // create a Phi for the memory state
2775 Node* mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2776 Node* memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2777 mem_phi->init_req(1, memproj);
2778 mem_phi->init_req(2, mem);
2779 transform_later(mem_phi);
2780 _igvn.replace_node(_callprojs->fallthrough_memproj, mem_phi);
2781 }
2782 }
2783
2784 // An inline type might be returned from the call but we don't know its
2785 // type. Either we get a buffered inline type (and nothing needs to be done)
2786 // or one of the values being returned is the klass of the inline type
2787 // and we need to allocate an inline type instance of that type and
2788 // initialize it with other values being returned. In that case, we
2789 // first try a fast path allocation and initialize the value with the
2790 // inline klass's pack handler or we fall back to a runtime call.
2791 void PhaseMacroExpand::expand_mh_intrinsic_return(CallStaticJavaNode* call) {
2792 assert(call->method()->is_method_handle_intrinsic(), "must be a method handle intrinsic call");
2793 Node* ret = call->proj_out_or_null(TypeFunc::Parms);
2794 if (ret == nullptr) {
2795 return;
2796 }
2797 const TypeFunc* tf = call->_tf;
2798 const TypeTuple* domain = OptoRuntime::store_inline_type_fields_Type()->domain_cc();
2799 const TypeFunc* new_tf = TypeFunc::make(tf->domain_sig(), tf->domain_cc(), tf->range_sig(), domain, true);
2800 call->_tf = new_tf;
2801 // Make sure the change of type is applied before projections are processed by igvn
2802 _igvn.set_type(call, call->Value(&_igvn));
2803 _igvn.set_type(ret, ret->Value(&_igvn));
2804
2805 // Before any new projection is added:
2806 CallProjections* projs = call->extract_projections(true, true);
2807
2808 // Create temporary hook nodes that will be replaced below.
2809 // Add an input to prevent hook nodes from being dead.
2810 Node* ctl = new Node(call);
2811 Node* mem = new Node(ctl);
2812 Node* io = new Node(ctl);
2813 Node* ex_ctl = new Node(ctl);
2814 Node* ex_mem = new Node(ctl);
2815 Node* ex_io = new Node(ctl);
2816 Node* res = new Node(ctl);
2817
2818 // Allocate a new buffered inline type only if a new one is not returned
2819 Node* cast = transform_later(new CastP2XNode(ctl, res));
2820 Node* mask = MakeConX(0x1);
2821 Node* masked = transform_later(new AndXNode(cast, mask));
2822 Node* cmp = transform_later(new CmpXNode(masked, mask));
2823 Node* bol = transform_later(new BoolNode(cmp, BoolTest::eq));
2824 IfNode* allocation_iff = new IfNode(ctl, bol, PROB_MAX, COUNT_UNKNOWN);
2825 transform_later(allocation_iff);
2826 Node* allocation_ctl = transform_later(new IfTrueNode(allocation_iff));
2827 Node* no_allocation_ctl = transform_later(new IfFalseNode(allocation_iff));
2828 Node* no_allocation_res = transform_later(new CheckCastPPNode(no_allocation_ctl, res, TypeInstPtr::BOTTOM));
2829
2830 // Try to allocate a new buffered inline instance either from TLAB or eden space
2831 Node* needgc_ctrl = nullptr; // needgc means slowcase, i.e. allocation failed
2832 CallLeafNoFPNode* handler_call;
2833 const bool alloc_in_place = UseTLAB;
2834 if (alloc_in_place) {
2835 Node* fast_oop_ctrl = nullptr;
2836 Node* fast_oop_rawmem = nullptr;
2837 Node* mask2 = MakeConX(-2);
2838 Node* masked2 = transform_later(new AndXNode(cast, mask2));
2839 Node* rawklassptr = transform_later(new CastX2PNode(masked2));
2840 Node* klass_node = transform_later(new CheckCastPPNode(allocation_ctl, rawklassptr, TypeInstKlassPtr::OBJECT_OR_NULL));
2841 Node* layout_val = make_load_raw(nullptr, mem, klass_node, in_bytes(Klass::layout_helper_offset()), TypeInt::INT, T_INT);
2842 Node* size_in_bytes = ConvI2X(layout_val);
2843 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2844 Node* fast_oop = bs->obj_allocate(this, mem, allocation_ctl, size_in_bytes, io, needgc_ctrl,
2845 fast_oop_ctrl, fast_oop_rawmem,
2846 AllocateInstancePrefetchLines);
2847 // Allocation succeed, initialize buffered inline instance header firstly,
2848 // and then initialize its fields with an inline class specific handler
2849 Node* mark_word_node;
2850 if (UseCompactObjectHeaders) {
2851 // COH: We need to load the prototype from the klass at runtime since it encodes the klass pointer already.
2852 mark_word_node = make_load_raw(fast_oop_ctrl, fast_oop_rawmem, klass_node, in_bytes(Klass::prototype_header_offset()), TypeRawPtr::BOTTOM, T_ADDRESS);
2853 } else {
2854 // Otherwise, use the static prototype.
2855 mark_word_node = makecon(TypeRawPtr::make((address)markWord::inline_type_prototype().value()));
2856 }
2857
2858 fast_oop_rawmem = make_store_raw(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::mark_offset_in_bytes(), mark_word_node, T_ADDRESS);
2859 if (!UseCompactObjectHeaders) {
2860 // COH: Everything is encoded in the mark word, so nothing left to do.
2861 fast_oop_rawmem = make_store_raw(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
2862 fast_oop_rawmem = make_store_raw(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::klass_gap_offset_in_bytes(), intcon(0), T_INT);
2863 }
2864 Node* members = make_load_raw(fast_oop_ctrl, fast_oop_rawmem, klass_node, in_bytes(InlineKlass::adr_members_offset()), TypeRawPtr::BOTTOM, T_ADDRESS);
2865 Node* pack_handler = make_load_raw(fast_oop_ctrl, fast_oop_rawmem, members, in_bytes(InlineKlass::pack_handler_offset()), TypeRawPtr::BOTTOM, T_ADDRESS);
2866 handler_call = new CallLeafNoFPNode(OptoRuntime::pack_inline_type_Type(),
2867 nullptr,
2868 "pack handler",
2869 TypeRawPtr::BOTTOM);
2870 handler_call->init_req(TypeFunc::Control, fast_oop_ctrl);
2871 handler_call->init_req(TypeFunc::Memory, fast_oop_rawmem);
2872 handler_call->init_req(TypeFunc::I_O, top());
2873 handler_call->init_req(TypeFunc::FramePtr, call->in(TypeFunc::FramePtr));
2874 handler_call->init_req(TypeFunc::ReturnAdr, top());
2875 handler_call->init_req(TypeFunc::Parms, pack_handler);
2876 handler_call->init_req(TypeFunc::Parms+1, fast_oop);
2877 } else {
2878 needgc_ctrl = allocation_ctl;
2879 }
2880
2881 // Allocation failed, fall back to a runtime call
2882 CallStaticJavaNode* slow_call = new CallStaticJavaNode(OptoRuntime::store_inline_type_fields_Type(),
2883 StubRoutines::store_inline_type_fields_to_buf(),
2884 "store_inline_type_fields",
2885 TypePtr::BOTTOM);
2886 slow_call->init_req(TypeFunc::Control, needgc_ctrl);
2887 slow_call->init_req(TypeFunc::Memory, mem);
2888 slow_call->init_req(TypeFunc::I_O, io);
2889 slow_call->init_req(TypeFunc::FramePtr, call->in(TypeFunc::FramePtr));
2890 slow_call->init_req(TypeFunc::ReturnAdr, call->in(TypeFunc::ReturnAdr));
2891 slow_call->init_req(TypeFunc::Parms, res);
2892
2893 Node* slow_ctl = transform_later(new ProjNode(slow_call, TypeFunc::Control));
2894 Node* slow_mem = transform_later(new ProjNode(slow_call, TypeFunc::Memory));
2895 Node* slow_io = transform_later(new ProjNode(slow_call, TypeFunc::I_O));
2896 Node* slow_res = transform_later(new ProjNode(slow_call, TypeFunc::Parms));
2897 Node* slow_catc = transform_later(new CatchNode(slow_ctl, slow_io, 2));
2898 Node* slow_norm = transform_later(new CatchProjNode(slow_catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci));
2899 Node* slow_excp = transform_later(new CatchProjNode(slow_catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci));
2900
2901 Node* ex_r = new RegionNode(3);
2902 Node* ex_mem_phi = new PhiNode(ex_r, Type::MEMORY, TypePtr::BOTTOM);
2903 Node* ex_io_phi = new PhiNode(ex_r, Type::ABIO);
2904 ex_r->init_req(1, slow_excp);
2905 ex_mem_phi->init_req(1, slow_mem);
2906 ex_io_phi->init_req(1, slow_io);
2907 ex_r->init_req(2, ex_ctl);
2908 ex_mem_phi->init_req(2, ex_mem);
2909 ex_io_phi->init_req(2, ex_io);
2910 transform_later(ex_r);
2911 transform_later(ex_mem_phi);
2912 transform_later(ex_io_phi);
2913
2914 // We don't know how many values are returned. This assumes the
2915 // worst case, that all available registers are used.
2916 for (uint i = TypeFunc::Parms+1; i < domain->cnt(); i++) {
2917 if (domain->field_at(i) == Type::HALF) {
2918 slow_call->init_req(i, top());
2919 if (alloc_in_place) {
2920 handler_call->init_req(i+1, top());
2921 }
2922 continue;
2923 }
2924 Node* proj = transform_later(new ProjNode(call, i));
2925 slow_call->init_req(i, proj);
2926 if (alloc_in_place) {
2927 handler_call->init_req(i+1, proj);
2928 }
2929 }
2930 // We can safepoint at that new call
2931 slow_call->copy_call_debug_info(&_igvn, call);
2932 transform_later(slow_call);
2933 if (alloc_in_place) {
2934 transform_later(handler_call);
2935 }
2936
2937 Node* fast_ctl = nullptr;
2938 Node* fast_res = nullptr;
2939 MergeMemNode* fast_mem = nullptr;
2940 if (alloc_in_place) {
2941 fast_ctl = transform_later(new ProjNode(handler_call, TypeFunc::Control));
2942 Node* rawmem = transform_later(new ProjNode(handler_call, TypeFunc::Memory));
2943 fast_res = transform_later(new ProjNode(handler_call, TypeFunc::Parms));
2944 fast_mem = MergeMemNode::make(mem);
2945 fast_mem->set_memory_at(Compile::AliasIdxRaw, rawmem);
2946 transform_later(fast_mem);
2947 }
2948
2949 Node* r = new RegionNode(alloc_in_place ? 4 : 3);
2950 Node* mem_phi = new PhiNode(r, Type::MEMORY, TypePtr::BOTTOM);
2951 Node* io_phi = new PhiNode(r, Type::ABIO);
2952 Node* res_phi = new PhiNode(r, TypeInstPtr::BOTTOM);
2953 r->init_req(1, no_allocation_ctl);
2954 mem_phi->init_req(1, mem);
2955 io_phi->init_req(1, io);
2956 res_phi->init_req(1, no_allocation_res);
2957 r->init_req(2, slow_norm);
2958 mem_phi->init_req(2, slow_mem);
2959 io_phi->init_req(2, slow_io);
2960 res_phi->init_req(2, slow_res);
2961 if (alloc_in_place) {
2962 r->init_req(3, fast_ctl);
2963 mem_phi->init_req(3, fast_mem);
2964 io_phi->init_req(3, io);
2965 res_phi->init_req(3, fast_res);
2966 }
2967 transform_later(r);
2968 transform_later(mem_phi);
2969 transform_later(io_phi);
2970 transform_later(res_phi);
2971
2972 // Do not let stores that initialize this buffer be reordered with a subsequent
2973 // store that would make this buffer accessible by other threads.
2974 MemBarNode* mb = MemBarNode::make(C, Op_MemBarStoreStore, Compile::AliasIdxBot);
2975 transform_later(mb);
2976 mb->init_req(TypeFunc::Memory, mem_phi);
2977 mb->init_req(TypeFunc::Control, r);
2978 r = new ProjNode(mb, TypeFunc::Control);
2979 transform_later(r);
2980 mem_phi = new ProjNode(mb, TypeFunc::Memory);
2981 transform_later(mem_phi);
2982
2983 assert(projs->nb_resproj == 1, "unexpected number of results");
2984 _igvn.replace_in_uses(projs->fallthrough_catchproj, r);
2985 _igvn.replace_in_uses(projs->fallthrough_memproj, mem_phi);
2986 _igvn.replace_in_uses(projs->fallthrough_ioproj, io_phi);
2987 _igvn.replace_in_uses(projs->resproj[0], res_phi);
2988 _igvn.replace_in_uses(projs->catchall_catchproj, ex_r);
2989 _igvn.replace_in_uses(projs->catchall_memproj, ex_mem_phi);
2990 _igvn.replace_in_uses(projs->catchall_ioproj, ex_io_phi);
2991 // The CatchNode should not use the ex_io_phi. Re-connect it to the catchall_ioproj.
2992 Node* cn = projs->fallthrough_catchproj->in(0);
2993 _igvn.replace_input_of(cn, 1, projs->catchall_ioproj);
2994
2995 _igvn.replace_node(ctl, projs->fallthrough_catchproj);
2996 _igvn.replace_node(mem, projs->fallthrough_memproj);
2997 _igvn.replace_node(io, projs->fallthrough_ioproj);
2998 _igvn.replace_node(res, projs->resproj[0]);
2999 _igvn.replace_node(ex_ctl, projs->catchall_catchproj);
3000 _igvn.replace_node(ex_mem, projs->catchall_memproj);
3001 _igvn.replace_node(ex_io, projs->catchall_ioproj);
3002 }
3003
3004 void PhaseMacroExpand::expand_subtypecheck_node(SubTypeCheckNode *check) {
3005 assert(check->in(SubTypeCheckNode::Control) == nullptr, "should be pinned");
3006 Node* bol = check->unique_out();
3007 Node* obj_or_subklass = check->in(SubTypeCheckNode::ObjOrSubKlass);
3008 Node* superklass = check->in(SubTypeCheckNode::SuperKlass);
3009 assert(bol->is_Bool() && bol->as_Bool()->_test._test == BoolTest::ne, "unexpected bool node");
3010
3011 for (DUIterator_Last imin, i = bol->last_outs(imin); i >= imin; --i) {
3012 Node* iff = bol->last_out(i);
3013 assert(iff->is_If(), "where's the if?");
3014
3015 if (iff->in(0)->is_top()) {
3016 _igvn.replace_input_of(iff, 1, C->top());
3017 continue;
3018 }
3019
3020 IfTrueNode* iftrue = iff->as_If()->true_proj();
3021 IfFalseNode* iffalse = iff->as_If()->false_proj();
3022 Node* ctrl = iff->in(0);
3023
3024 Node* subklass = nullptr;
3025 if (_igvn.type(obj_or_subklass)->isa_klassptr()) {
3026 subklass = obj_or_subklass;
3027 } else {
3028 Node* k_adr = basic_plus_adr(obj_or_subklass, oopDesc::klass_offset_in_bytes());
3029 subklass = _igvn.transform(LoadKlassNode::make(_igvn, C->immutable_memory(), k_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
3030 }
3031
3032 Node* not_subtype_ctrl = Phase::gen_subtype_check(subklass, superklass, &ctrl, nullptr, _igvn, check->method(), check->bci());
3033
3034 _igvn.replace_input_of(iff, 0, C->top());
3035 _igvn.replace_node(iftrue, not_subtype_ctrl);
3036 _igvn.replace_node(iffalse, ctrl);
3037 }
3038 _igvn.replace_node(check, C->top());
3039 }
3040
3041 // FlatArrayCheckNode (array1 array2 ...) is expanded into:
3042 //
3043 // long mark = array1.mark | array2.mark | ...;
3044 // long locked_bit = markWord::unlocked_value & array1.mark & array2.mark & ...;
3045 // if (locked_bit == 0) {
3046 // // One array is locked, load prototype header from the klass
3047 // mark = array1.klass.proto | array2.klass.proto | ...
3048 // }
3049 // if ((mark & markWord::flat_array_bit_in_place) == 0) {
3050 // ...
3051 // }
3052 void PhaseMacroExpand::expand_flatarraycheck_node(FlatArrayCheckNode* check) {
3053 bool array_inputs = _igvn.type(check->in(FlatArrayCheckNode::ArrayOrKlass))->isa_oopptr() != nullptr;
3054 if (array_inputs) {
3055 Node* mark = MakeConX(0);
3056 Node* locked_bit = MakeConX(markWord::unlocked_value);
3057 Node* mem = check->in(FlatArrayCheckNode::Memory);
3058 for (uint i = FlatArrayCheckNode::ArrayOrKlass; i < check->req(); ++i) {
3059 Node* ary = check->in(i);
3060 const TypeOopPtr* t = _igvn.type(ary)->isa_oopptr();
3061 assert(t != nullptr, "Mixing array and klass inputs");
3062 assert(!t->is_flat() && !t->is_not_flat(), "Should have been optimized out");
3063 Node* mark_adr = basic_plus_adr(ary, oopDesc::mark_offset_in_bytes());
3064 Node* mark_load = _igvn.transform(LoadNode::make(_igvn, nullptr, mem, mark_adr, mark_adr->bottom_type()->is_ptr(), TypeX_X, TypeX_X->basic_type(), MemNode::unordered));
3065 mark = _igvn.transform(new OrXNode(mark, mark_load));
3066 locked_bit = _igvn.transform(new AndXNode(locked_bit, mark_load));
3067 }
3068 assert(!mark->is_Con(), "Should have been optimized out");
3069 Node* cmp = _igvn.transform(new CmpXNode(locked_bit, MakeConX(0)));
3070 Node* is_unlocked = _igvn.transform(new BoolNode(cmp, BoolTest::ne));
3071
3072 // BoolNode might be shared, replace each if user
3073 Node* old_bol = check->unique_out();
3074 assert(old_bol->is_Bool() && old_bol->as_Bool()->_test._test == BoolTest::ne, "unexpected condition");
3075 for (DUIterator_Last imin, i = old_bol->last_outs(imin); i >= imin; --i) {
3076 IfNode* old_iff = old_bol->last_out(i)->as_If();
3077 Node* ctrl = old_iff->in(0);
3078 RegionNode* region = new RegionNode(3);
3079 Node* mark_phi = new PhiNode(region, TypeX_X);
3080
3081 // Check if array is unlocked
3082 IfNode* iff = _igvn.transform(new IfNode(ctrl, is_unlocked, PROB_MAX, COUNT_UNKNOWN))->as_If();
3083
3084 // Unlocked: Use bits from mark word
3085 region->init_req(1, _igvn.transform(new IfTrueNode(iff)));
3086 mark_phi->init_req(1, mark);
3087
3088 // Locked: Load prototype header from klass
3089 ctrl = _igvn.transform(new IfFalseNode(iff));
3090 Node* proto = MakeConX(0);
3091 for (uint i = FlatArrayCheckNode::ArrayOrKlass; i < check->req(); ++i) {
3092 Node* ary = check->in(i);
3093 // Make loads control dependent to make sure they are only executed if array is locked
3094 Node* klass_adr = basic_plus_adr(ary, oopDesc::klass_offset_in_bytes());
3095 Node* klass = _igvn.transform(LoadKlassNode::make(_igvn, C->immutable_memory(), klass_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
3096 Node* proto_adr = basic_plus_adr(top(), klass, in_bytes(Klass::prototype_header_offset()));
3097 Node* proto_load = _igvn.transform(LoadNode::make(_igvn, ctrl, C->immutable_memory(), proto_adr, proto_adr->bottom_type()->is_ptr(), TypeX_X, TypeX_X->basic_type(), MemNode::unordered));
3098 proto = _igvn.transform(new OrXNode(proto, proto_load));
3099 }
3100 region->init_req(2, ctrl);
3101 mark_phi->init_req(2, proto);
3102
3103 // Check if flat array bits are set
3104 Node* mask = MakeConX(markWord::flat_array_bit_in_place);
3105 Node* masked = _igvn.transform(new AndXNode(_igvn.transform(mark_phi), mask));
3106 cmp = _igvn.transform(new CmpXNode(masked, MakeConX(0)));
3107 Node* is_not_flat = _igvn.transform(new BoolNode(cmp, BoolTest::eq));
3108
3109 ctrl = _igvn.transform(region);
3110 iff = _igvn.transform(new IfNode(ctrl, is_not_flat, PROB_MAX, COUNT_UNKNOWN))->as_If();
3111 _igvn.replace_node(old_iff, iff);
3112 }
3113 _igvn.replace_node(check, C->top());
3114 } else {
3115 // Fall back to layout helper check
3116 Node* lhs = intcon(0);
3117 for (uint i = FlatArrayCheckNode::ArrayOrKlass; i < check->req(); ++i) {
3118 Node* array_or_klass = check->in(i);
3119 Node* klass = nullptr;
3120 const TypePtr* t = _igvn.type(array_or_klass)->is_ptr();
3121 assert(!t->is_flat() && !t->is_not_flat(), "Should have been optimized out");
3122 if (t->isa_oopptr() != nullptr) {
3123 Node* klass_adr = basic_plus_adr(array_or_klass, oopDesc::klass_offset_in_bytes());
3124 klass = transform_later(LoadKlassNode::make(_igvn, C->immutable_memory(), klass_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
3125 } else {
3126 assert(t->isa_klassptr(), "Unexpected input type");
3127 klass = array_or_klass;
3128 }
3129 Node* lh_addr = basic_plus_adr(top(), klass, in_bytes(Klass::layout_helper_offset()));
3130 Node* lh_val = _igvn.transform(LoadNode::make(_igvn, nullptr, C->immutable_memory(), lh_addr, lh_addr->bottom_type()->is_ptr(), TypeInt::INT, T_INT, MemNode::unordered));
3131 lhs = _igvn.transform(new OrINode(lhs, lh_val));
3132 }
3133 Node* masked = transform_later(new AndINode(lhs, intcon(Klass::_lh_array_tag_flat_value_bit_inplace)));
3134 Node* cmp = transform_later(new CmpINode(masked, intcon(0)));
3135 Node* bol = transform_later(new BoolNode(cmp, BoolTest::eq));
3136 Node* m2b = transform_later(new Conv2BNode(masked));
3137 // The matcher expects the input to If/CMove nodes to be produced by a Bool(CmpI..)
3138 // pattern, but the input to other potential users (e.g. Phi) to be some
3139 // other pattern (e.g. a Conv2B node, possibly idealized as a CMoveI).
3140 Node* old_bol = check->unique_out();
3141 for (DUIterator_Last imin, i = old_bol->last_outs(imin); i >= imin; --i) {
3142 Node* user = old_bol->last_out(i);
3143 for (uint j = 0; j < user->req(); j++) {
3144 Node* n = user->in(j);
3145 if (n == old_bol) {
3146 _igvn.replace_input_of(user, j, (user->is_If() || user->is_CMove()) ? bol : m2b);
3147 }
3148 }
3149 }
3150 _igvn.replace_node(check, C->top());
3151 }
3152 }
3153
3154 // Perform refining of strip mined loop nodes in the macro nodes list.
3155 void PhaseMacroExpand::refine_strip_mined_loop_macro_nodes() {
3156 for (int i = C->macro_count(); i > 0; i--) {
3157 Node* n = C->macro_node(i - 1);
3158 if (n->is_OuterStripMinedLoop()) {
3159 n->as_OuterStripMinedLoop()->adjust_strip_mined_loop(&_igvn);
3160 }
3161 }
3162 }
3163
3164 //---------------------------eliminate_macro_nodes----------------------
3165 // Eliminate scalar replaced allocations and associated locks.
3166 void PhaseMacroExpand::eliminate_macro_nodes(bool eliminate_locks) {
3167 if (C->macro_count() == 0) {
3168 return;
3169 }
3170
3171 if (StressMacroElimination) {
3172 C->shuffle_macro_nodes();
3173 }
3174 NOT_PRODUCT(int membar_before = count_MemBar(C);)
3175
3176 int iteration = 0;
3177 while (C->macro_count() > 0) {
3178 if (iteration++ > 100) {
3179 assert(false, "Too slow convergence of macro elimination");
3180 break;
3181 }
3182
3183 // Postpone lock elimination to after EA when most allocations are eliminated
3184 // because they might block lock elimination if their escape state isn't
3185 // determined yet and we only got one chance at eliminating the lock.
3186 if (eliminate_locks) {
3187 // Before elimination may re-mark (change to Nested or NonEscObj)
3188 // all associated (same box and obj) lock and unlock nodes.
3189 int cnt = C->macro_count();
3190 for (int i=0; i < cnt; i++) {
3191 Node *n = C->macro_node(i);
3192 if (n->is_AbstractLock()) { // Lock and Unlock nodes
3193 mark_eliminated_locking_nodes(n->as_AbstractLock());
3194 }
3195 }
3196 // Re-marking may break consistency of Coarsened locks.
3197 if (!C->coarsened_locks_consistent()) {
3198 return; // recompile without Coarsened locks if broken
3199 } else {
3200 // After coarsened locks are eliminated locking regions
3201 // become unbalanced. We should not execute any more
3202 // locks elimination optimizations on them.
3203 C->mark_unbalanced_boxes();
3204 }
3205 }
3206
3207 bool progress = false;
3208 for (int i = C->macro_count(); i > 0; i = MIN2(i - 1, C->macro_count())) { // more than 1 element can be eliminated at once
3209 Node* n = C->macro_node(i - 1);
3210 bool success = false;
3211 DEBUG_ONLY(int old_macro_count = C->macro_count();)
3212 switch (n->class_id()) {
3213 case Node::Class_Allocate:
3214 case Node::Class_AllocateArray:
3215 success = eliminate_allocate_node(n->as_Allocate());
3216 #ifndef PRODUCT
3217 if (success && PrintOptoStatistics) {
3218 AtomicAccess::inc(&PhaseMacroExpand::_objs_scalar_replaced_counter);
3219 }
3220 #endif
3221 break;
3222 case Node::Class_CallStaticJava: {
3223 CallStaticJavaNode* call = n->as_CallStaticJava();
3224 if (!call->method()->is_method_handle_intrinsic()) {
3225 success = eliminate_boxing_node(n->as_CallStaticJava());
3226 }
3227 break;
3228 }
3229 case Node::Class_Lock:
3230 case Node::Class_Unlock:
3231 if (eliminate_locks) {
3232 success = eliminate_locking_node(n->as_AbstractLock());
3233 #ifndef PRODUCT
3234 if (success && PrintOptoStatistics) {
3235 AtomicAccess::inc(&PhaseMacroExpand::_monitor_objects_removed_counter);
3236 }
3237 #endif
3238 }
3239 break;
3240 case Node::Class_ArrayCopy:
3241 break;
3242 case Node::Class_OuterStripMinedLoop:
3243 break;
3244 case Node::Class_SubTypeCheck:
3245 break;
3246 case Node::Class_Opaque1:
3247 break;
3248 case Node::Class_FlatArrayCheck:
3249 break;
3250 default:
3251 assert(n->Opcode() == Op_LoopLimit ||
3252 n->Opcode() == Op_ModD ||
3253 n->Opcode() == Op_ModF ||
3254 n->Opcode() == Op_PowD ||
3255 n->is_OpaqueConstantBool() ||
3256 n->is_OpaqueInitializedAssertionPredicate() ||
3257 n->Opcode() == Op_MaxL ||
3258 n->Opcode() == Op_MinL ||
3259 BarrierSet::barrier_set()->barrier_set_c2()->is_gc_barrier_node(n),
3260 "unknown node type in macro list");
3261 }
3262 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
3263 progress = progress || success;
3264 if (success) {
3265 C->print_method(PHASE_AFTER_MACRO_ELIMINATION_STEP, 5, n);
3266 }
3267 }
3268
3269 // Ensure the graph after PhaseMacroExpand::eliminate_macro_nodes is canonical (no igvn
3270 // transformation is pending). If an allocation is used only in safepoints, elimination of
3271 // other macro nodes can remove all these safepoints, allowing the allocation to be removed.
3272 // Hence after igvn we retry removing macro nodes if some progress that has been made in this
3273 // iteration.
3274 _igvn.set_delay_transform(false);
3275 _igvn.optimize();
3276 if (C->failing()) {
3277 return;
3278 }
3279 _igvn.set_delay_transform(true);
3280
3281 if (!progress) {
3282 break;
3283 }
3284 }
3285 #ifndef PRODUCT
3286 if (PrintOptoStatistics) {
3287 int membar_after = count_MemBar(C);
3288 AtomicAccess::add(&PhaseMacroExpand::_memory_barriers_removed_counter, membar_before - membar_after);
3289 }
3290 #endif
3291 }
3292
3293 void PhaseMacroExpand::eliminate_opaque_looplimit_macro_nodes() {
3294 if (C->macro_count() == 0) {
3295 return;
3296 }
3297 refine_strip_mined_loop_macro_nodes();
3298 // Eliminate Opaque and LoopLimit nodes. Do it after all loop optimizations.
3299 bool progress = true;
3300 while (progress) {
3301 progress = false;
3302 for (int i = C->macro_count(); i > 0; i--) {
3303 Node* n = C->macro_node(i-1);
3304 bool success = false;
3305 DEBUG_ONLY(int old_macro_count = C->macro_count();)
3306 if (n->Opcode() == Op_LoopLimit) {
3307 // Remove it from macro list and put on IGVN worklist to optimize.
3308 C->remove_macro_node(n);
3309 _igvn._worklist.push(n);
3310 success = true;
3311 } else if (n->Opcode() == Op_CallStaticJava) {
3312 CallStaticJavaNode* call = n->as_CallStaticJava();
3313 if (!call->method()->is_method_handle_intrinsic()) {
3314 // Remove it from macro list and put on IGVN worklist to optimize.
3315 C->remove_macro_node(n);
3316 _igvn._worklist.push(n);
3317 success = true;
3318 }
3319 } else if (n->is_Opaque1()) {
3320 _igvn.replace_node(n, n->in(1));
3321 success = true;
3322 } else if (n->is_OpaqueConstantBool()) {
3323 // Tests with OpaqueConstantBool nodes are implicitly known. Replace the node with true/false. In debug builds,
3324 // we leave the test in the graph to have an additional sanity check at runtime. If the test fails (i.e. a bug),
3325 // we will execute a Halt node.
3326 #ifdef ASSERT
3327 _igvn.replace_node(n, n->in(1));
3328 #else
3329 _igvn.replace_node(n, _igvn.intcon(n->as_OpaqueConstantBool()->constant()));
3330 #endif
3331 success = true;
3332 } else if (n->is_OpaqueInitializedAssertionPredicate()) {
3333 // Initialized Assertion Predicates must always evaluate to true. Therefore, we get rid of them in product
3334 // builds as they are useless. In debug builds we keep them as additional verification code. Even though
3335 // loop opts are already over, we want to keep Initialized Assertion Predicates alive as long as possible to
3336 // enable folding of dead control paths within which cast nodes become top after due to impossible types -
3337 // even after loop opts are over. Therefore, we delay the removal of these opaque nodes until now.
3338 #ifdef ASSERT
3407 // Worst case is a macro node gets expanded into about 200 nodes.
3408 // Allow 50% more for optimization.
3409 if (C->check_node_count(300, "out of nodes before macro expansion")) {
3410 return true;
3411 }
3412
3413 DEBUG_ONLY(int old_macro_count = C->macro_count();)
3414 switch (n->class_id()) {
3415 case Node::Class_Lock:
3416 expand_lock_node(n->as_Lock());
3417 break;
3418 case Node::Class_Unlock:
3419 expand_unlock_node(n->as_Unlock());
3420 break;
3421 case Node::Class_ArrayCopy:
3422 expand_arraycopy_node(n->as_ArrayCopy());
3423 break;
3424 case Node::Class_SubTypeCheck:
3425 expand_subtypecheck_node(n->as_SubTypeCheck());
3426 break;
3427 case Node::Class_CallStaticJava:
3428 expand_mh_intrinsic_return(n->as_CallStaticJava());
3429 C->remove_macro_node(n);
3430 break;
3431 case Node::Class_FlatArrayCheck:
3432 expand_flatarraycheck_node(n->as_FlatArrayCheck());
3433 break;
3434 default:
3435 switch (n->Opcode()) {
3436 case Op_ModD:
3437 case Op_ModF:
3438 case Op_PowD: {
3439 CallLeafPureNode* call_macro = n->as_CallLeafPure();
3440 CallLeafPureNode* call = call_macro->inline_call_leaf_pure_node();
3441 _igvn.replace_node(call_macro, call);
3442 transform_later(call);
3443 break;
3444 }
3445 default:
3446 assert(false, "unknown node type in macro list");
3447 }
3448 }
3449 assert(C->macro_count() == (old_macro_count - 1), "expansion must have deleted one node from macro list");
3450 if (C->failing()) return true;
3451 C->print_method(PHASE_AFTER_MACRO_EXPANSION_STEP, 5, n);
3452
3453 // Clean up the graph so we're less likely to hit the maximum node
|