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 "precompiled.hpp"
26 #include "compiler/compileLog.hpp"
27 #include "gc/shared/collectedHeap.inline.hpp"
28 #include "gc/shared/tlab_globals.hpp"
29 #include "libadt/vectset.hpp"
30 #include "memory/universe.hpp"
31 #include "opto/addnode.hpp"
32 #include "opto/arraycopynode.hpp"
33 #include "opto/callnode.hpp"
34 #include "opto/castnode.hpp"
35 #include "opto/cfgnode.hpp"
36 #include "opto/compile.hpp"
37 #include "opto/convertnode.hpp"
38 #include "opto/graphKit.hpp"
39 #include "opto/intrinsicnode.hpp"
40 #include "opto/locknode.hpp"
41 #include "opto/loopnode.hpp"
42 #include "opto/macro.hpp"
43 #include "opto/memnode.hpp"
44 #include "opto/narrowptrnode.hpp"
45 #include "opto/node.hpp"
46 #include "opto/opaquenode.hpp"
47 #include "opto/phaseX.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/macros.hpp"
57 #include "utilities/powerOfTwo.hpp"
58 #if INCLUDE_G1GC
59 #include "gc/g1/g1ThreadLocalData.hpp"
60 #endif // INCLUDE_G1GC
61 #if INCLUDE_SHENANDOAHGC
62 #include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp"
63 #endif
64
65
66 //
67 // Replace any references to "oldref" in inputs to "use" with "newref".
68 // Returns the number of replacements made.
69 //
70 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) {
71 int nreplacements = 0;
72 uint req = use->req();
73 for (uint j = 0; j < use->len(); j++) {
74 Node *uin = use->in(j);
75 if (uin == oldref) {
76 if (j < req)
77 use->set_req(j, newref);
78 else
79 use->set_prec(j, newref);
80 nreplacements++;
81 } else if (j >= req && uin == NULL) {
82 break;
83 }
84 }
85 return nreplacements;
86 }
87
88 void PhaseMacroExpand::migrate_outs(Node *old, Node *target) {
89 assert(old != NULL, "sanity");
90 for (DUIterator_Fast imax, i = old->fast_outs(imax); i < imax; i++) {
91 Node* use = old->fast_out(i);
92 _igvn.rehash_node_delayed(use);
93 imax -= replace_input(use, old, target);
94 // back up iterator
95 --i;
96 }
97 assert(old->outcnt() == 0, "all uses must be deleted");
98 }
99
100 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word, int mask, int bits, bool return_fast_path) {
101 Node* cmp;
102 if (mask != 0) {
103 Node* and_node = transform_later(new AndXNode(word, MakeConX(mask)));
104 cmp = transform_later(new CmpXNode(and_node, MakeConX(bits)));
105 } else {
106 cmp = word;
107 }
108 Node* bol = transform_later(new BoolNode(cmp, BoolTest::ne));
109 IfNode* iff = new IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
110 transform_later(iff);
111
112 // Fast path taken.
113 Node *fast_taken = transform_later(new IfFalseNode(iff));
114
115 // Fast path not-taken, i.e. slow path
116 Node *slow_taken = transform_later(new IfTrueNode(iff));
117
118 if (return_fast_path) {
119 region->init_req(edge, slow_taken); // Capture slow-control
142 // Slow-path call
143 CallNode *call = leaf_name
144 ? (CallNode*)new CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM )
145 : (CallNode*)new CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), TypeRawPtr::BOTTOM );
146
147 // Slow path call has no side-effects, uses few values
148 copy_predefined_input_for_runtime_call(slow_path, oldcall, call );
149 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0);
150 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1);
151 if (parm2 != NULL) call->init_req(TypeFunc::Parms+2, parm2);
152 call->copy_call_debug_info(&_igvn, oldcall);
153 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
154 _igvn.replace_node(oldcall, call);
155 transform_later(call);
156
157 return call;
158 }
159
160 void PhaseMacroExpand::eliminate_gc_barrier(Node* p2x) {
161 BarrierSetC2 *bs = BarrierSet::barrier_set()->barrier_set_c2();
162 bs->eliminate_gc_barrier(this, p2x);
163 #ifndef PRODUCT
164 if (PrintOptoStatistics) {
165 Atomic::inc(&PhaseMacroExpand::_GC_barriers_removed_counter);
166 }
167 #endif
168 }
169
170 // Search for a memory operation for the specified memory slice.
171 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) {
172 Node *orig_mem = mem;
173 Node *alloc_mem = alloc->in(TypeFunc::Memory);
174 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr();
175 while (true) {
176 if (mem == alloc_mem || mem == start_mem ) {
177 return mem; // hit one of our sentinels
178 } else if (mem->is_MergeMem()) {
179 mem = mem->as_MergeMem()->memory_at(alias_idx);
180 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) {
181 Node *in = mem->in(0);
182 // we can safely skip over safepoints, calls, locks and membars because we
196 ArrayCopyNode* ac = NULL;
197 if (ArrayCopyNode::may_modify(tinst, in->as_MemBar(), phase, ac)) {
198 if (ac != NULL) {
199 assert(ac->is_clonebasic(), "Only basic clone is a non escaping clone");
200 return ac;
201 }
202 }
203 mem = in->in(TypeFunc::Memory);
204 } else {
205 #ifdef ASSERT
206 in->dump();
207 mem->dump();
208 assert(false, "unexpected projection");
209 #endif
210 }
211 } else if (mem->is_Store()) {
212 const TypePtr* atype = mem->as_Store()->adr_type();
213 int adr_idx = phase->C->get_alias_index(atype);
214 if (adr_idx == alias_idx) {
215 assert(atype->isa_oopptr(), "address type must be oopptr");
216 int adr_offset = atype->offset();
217 uint adr_iid = atype->is_oopptr()->instance_id();
218 // Array elements references have the same alias_idx
219 // but different offset and different instance_id.
220 if (adr_offset == offset && adr_iid == alloc->_idx) {
221 return mem;
222 }
223 } else {
224 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw");
225 }
226 mem = mem->in(MemNode::Memory);
227 } else if (mem->is_ClearArray()) {
228 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) {
229 // Can not bypass initialization of the instance
230 // we are looking.
231 debug_only(intptr_t offset;)
232 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity");
233 InitializeNode* init = alloc->as_Allocate()->initialization();
234 // We are looking for stored value, return Initialize node
235 // or memory edge from Allocate node.
236 if (init != NULL) {
241 }
242 // Otherwise skip it (the call updated 'mem' value).
243 } else if (mem->Opcode() == Op_SCMemProj) {
244 mem = mem->in(0);
245 Node* adr = NULL;
246 if (mem->is_LoadStore()) {
247 adr = mem->in(MemNode::Address);
248 } else {
249 assert(mem->Opcode() == Op_EncodeISOArray ||
250 mem->Opcode() == Op_StrCompressedCopy, "sanity");
251 adr = mem->in(3); // Destination array
252 }
253 const TypePtr* atype = adr->bottom_type()->is_ptr();
254 int adr_idx = phase->C->get_alias_index(atype);
255 if (adr_idx == alias_idx) {
256 DEBUG_ONLY(mem->dump();)
257 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
258 return NULL;
259 }
260 mem = mem->in(MemNode::Memory);
261 } else if (mem->Opcode() == Op_StrInflatedCopy) {
262 Node* adr = mem->in(3); // Destination array
263 const TypePtr* atype = adr->bottom_type()->is_ptr();
264 int adr_idx = phase->C->get_alias_index(atype);
265 if (adr_idx == alias_idx) {
266 DEBUG_ONLY(mem->dump();)
267 assert(false, "Object is not scalar replaceable if a StrInflatedCopy node accesses its field");
268 return NULL;
269 }
270 mem = mem->in(MemNode::Memory);
271 } else {
272 return mem;
273 }
274 assert(mem != orig_mem, "dead memory loop");
275 }
276 }
277
278 // Generate loads from source of the arraycopy for fields of
279 // destination needed at a deoptimization point
280 Node* PhaseMacroExpand::make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, Node* mem, BasicType ft, const Type *ftype, AllocateNode *alloc) {
281 BasicType bt = ft;
286 }
287 Node* res = NULL;
288 if (ac->is_clonebasic()) {
289 assert(ac->in(ArrayCopyNode::Src) != ac->in(ArrayCopyNode::Dest), "clone source equals destination");
290 Node* base = ac->in(ArrayCopyNode::Src);
291 Node* adr = _igvn.transform(new AddPNode(base, base, MakeConX(offset)));
292 const TypePtr* adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
293 MergeMemNode* mergemen = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
294 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
295 res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemen, adr, adr_type, type, bt);
296 } else {
297 if (ac->modifies(offset, offset, &_igvn, true)) {
298 assert(ac->in(ArrayCopyNode::Dest) == alloc->result_cast(), "arraycopy destination should be allocation's result");
299 uint shift = exact_log2(type2aelembytes(bt));
300 Node* src_pos = ac->in(ArrayCopyNode::SrcPos);
301 Node* dest_pos = ac->in(ArrayCopyNode::DestPos);
302 const TypeInt* src_pos_t = _igvn.type(src_pos)->is_int();
303 const TypeInt* dest_pos_t = _igvn.type(dest_pos)->is_int();
304
305 Node* adr = NULL;
306 const TypePtr* adr_type = NULL;
307 if (src_pos_t->is_con() && dest_pos_t->is_con()) {
308 intptr_t off = ((src_pos_t->get_con() - dest_pos_t->get_con()) << shift) + offset;
309 Node* base = ac->in(ArrayCopyNode::Src);
310 adr = _igvn.transform(new AddPNode(base, base, MakeConX(off)));
311 adr_type = _igvn.type(base)->is_ptr()->add_offset(off);
312 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
313 // Don't emit a new load from src if src == dst but try to get the value from memory instead
314 return value_from_mem(ac->in(TypeFunc::Memory), ctl, ft, ftype, adr_type->isa_oopptr(), alloc);
315 }
316 } else {
317 Node* diff = _igvn.transform(new SubINode(ac->in(ArrayCopyNode::SrcPos), ac->in(ArrayCopyNode::DestPos)));
318 #ifdef _LP64
319 diff = _igvn.transform(new ConvI2LNode(diff));
320 #endif
321 diff = _igvn.transform(new LShiftXNode(diff, intcon(shift)));
322
323 Node* off = _igvn.transform(new AddXNode(MakeConX(offset), diff));
324 Node* base = ac->in(ArrayCopyNode::Src);
325 adr = _igvn.transform(new AddPNode(base, base, off));
326 adr_type = _igvn.type(base)->is_ptr()->add_offset(Type::OffsetBot);
327 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
328 // Non constant offset in the array: we can't statically
329 // determine the value
330 return NULL;
331 }
332 }
333 MergeMemNode* mergemen = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
334 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
335 res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemen, adr, adr_type, type, bt);
336 }
337 }
338 if (res != NULL) {
339 if (ftype->isa_narrowoop()) {
340 // PhaseMacroExpand::scalar_replacement adds DecodeN nodes
341 res = _igvn.transform(new EncodePNode(res, ftype));
342 }
343 return res;
344 }
345 return NULL;
346 }
347
348 //
349 // Given a Memory Phi, compute a value Phi containing the values from stores
350 // on the input paths.
351 // Note: this function is recursive, its depth is limited by the "level" argument
352 // Returns the computed Phi, or NULL if it cannot compute it.
353 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) {
354 assert(mem->is_Phi(), "sanity");
355 int alias_idx = C->get_alias_index(adr_t);
356 int offset = adr_t->offset();
357 int instance_id = adr_t->instance_id();
358
359 // Check if an appropriate value phi already exists.
360 Node* region = mem->in(0);
361 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) {
362 Node* phi = region->fast_out(k);
363 if (phi->is_Phi() && phi != mem &&
364 phi->as_Phi()->is_same_inst_field(phi_type, (int)mem->_idx, instance_id, alias_idx, offset)) {
365 return phi;
366 }
367 }
368 // Check if an appropriate new value phi already exists.
369 Node* new_phi = value_phis->find(mem->_idx);
370 if (new_phi != NULL)
371 return new_phi;
372
373 if (level <= 0) {
374 return NULL; // Give up: phi tree too deep
375 }
376 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
377 Node *alloc_mem = alloc->in(TypeFunc::Memory);
378
379 uint length = mem->req();
380 GrowableArray <Node *> values(length, length, NULL);
381
382 // create a new Phi for the value
383 PhiNode *phi = new PhiNode(mem->in(0), phi_type, NULL, mem->_idx, instance_id, alias_idx, offset);
384 transform_later(phi);
385 value_phis->push(phi, mem->_idx);
386
387 for (uint j = 1; j < length; j++) {
388 Node *in = mem->in(j);
389 if (in == NULL || in->is_top()) {
390 values.at_put(j, in);
391 } else {
392 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn);
393 if (val == start_mem || val == alloc_mem) {
394 // hit a sentinel, return appropriate 0 value
395 values.at_put(j, _igvn.zerocon(ft));
396 continue;
397 }
398 if (val->is_Initialize()) {
399 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
400 }
401 if (val == NULL) {
402 return NULL; // can't find a value on this path
403 }
404 if (val == mem) {
405 values.at_put(j, mem);
406 } else if (val->is_Store()) {
407 Node* n = val->in(MemNode::ValueIn);
408 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
409 n = bs->step_over_gc_barrier(n);
410 if (is_subword_type(ft)) {
411 n = Compile::narrow_value(ft, n, phi_type, &_igvn, true);
412 }
413 values.at_put(j, n);
414 } else if(val->is_Proj() && val->in(0) == alloc) {
415 values.at_put(j, _igvn.zerocon(ft));
416 } else if (val->is_Phi()) {
417 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1);
418 if (val == NULL) {
419 return NULL;
420 }
421 values.at_put(j, val);
422 } else if (val->Opcode() == Op_SCMemProj) {
423 assert(val->in(0)->is_LoadStore() ||
424 val->in(0)->Opcode() == Op_EncodeISOArray ||
425 val->in(0)->Opcode() == Op_StrCompressedCopy, "sanity");
426 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
427 return NULL;
428 } else if (val->is_ArrayCopy()) {
429 Node* res = make_arraycopy_load(val->as_ArrayCopy(), offset, val->in(0), val->in(TypeFunc::Memory), ft, phi_type, alloc);
430 if (res == NULL) {
431 return NULL;
432 }
433 values.at_put(j, res);
434 } else {
435 DEBUG_ONLY( val->dump(); )
439 }
440 }
441 // Set Phi's inputs
442 for (uint j = 1; j < length; j++) {
443 if (values.at(j) == mem) {
444 phi->init_req(j, phi);
445 } else {
446 phi->init_req(j, values.at(j));
447 }
448 }
449 return phi;
450 }
451
452 // Search the last value stored into the object's field.
453 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, Node *sfpt_ctl, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, AllocateNode *alloc) {
454 assert(adr_t->is_known_instance_field(), "instance required");
455 int instance_id = adr_t->instance_id();
456 assert((uint)instance_id == alloc->_idx, "wrong allocation");
457
458 int alias_idx = C->get_alias_index(adr_t);
459 int offset = adr_t->offset();
460 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
461 Node *alloc_ctrl = alloc->in(TypeFunc::Control);
462 Node *alloc_mem = alloc->in(TypeFunc::Memory);
463 VectorSet visited;
464
465 bool done = sfpt_mem == alloc_mem;
466 Node *mem = sfpt_mem;
467 while (!done) {
468 if (visited.test_set(mem->_idx)) {
469 return NULL; // found a loop, give up
470 }
471 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn);
472 if (mem == start_mem || mem == alloc_mem) {
473 done = true; // hit a sentinel, return appropriate 0 value
474 } else if (mem->is_Initialize()) {
475 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
476 if (mem == NULL) {
477 done = true; // Something go wrong.
478 } else if (mem->is_Store()) {
479 const TypePtr* atype = mem->as_Store()->adr_type();
480 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice");
481 done = true;
482 }
483 } else if (mem->is_Store()) {
484 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr();
485 assert(atype != NULL, "address type must be oopptr");
486 assert(C->get_alias_index(atype) == alias_idx &&
487 atype->is_known_instance_field() && atype->offset() == offset &&
488 atype->instance_id() == instance_id, "store is correct memory slice");
489 done = true;
490 } else if (mem->is_Phi()) {
491 // try to find a phi's unique input
492 Node *unique_input = NULL;
493 Node *top = C->top();
494 for (uint i = 1; i < mem->req(); i++) {
495 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn);
496 if (n == NULL || n == top || n == mem) {
497 continue;
498 } else if (unique_input == NULL) {
499 unique_input = n;
500 } else if (unique_input != n) {
501 unique_input = top;
502 break;
503 }
504 }
505 if (unique_input != NULL && unique_input != top) {
506 mem = unique_input;
507 } else {
508 done = true;
509 }
510 } else if (mem->is_ArrayCopy()) {
511 done = true;
512 } else {
513 DEBUG_ONLY( mem->dump(); )
514 assert(false, "unexpected node");
515 }
516 }
517 if (mem != NULL) {
518 if (mem == start_mem || mem == alloc_mem) {
519 // hit a sentinel, return appropriate 0 value
520 return _igvn.zerocon(ft);
521 } else if (mem->is_Store()) {
522 Node* n = mem->in(MemNode::ValueIn);
523 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
524 n = bs->step_over_gc_barrier(n);
525 return n;
526 } else if (mem->is_Phi()) {
527 // attempt to produce a Phi reflecting the values on the input paths of the Phi
528 Node_Stack value_phis(8);
529 Node* phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit);
530 if (phi != NULL) {
531 return phi;
532 } else {
533 // Kill all new Phis
534 while(value_phis.is_nonempty()) {
535 Node* n = value_phis.node();
536 _igvn.replace_node(n, C->top());
537 value_phis.pop();
538 }
539 }
540 } else if (mem->is_ArrayCopy()) {
541 Node* ctl = mem->in(0);
542 Node* m = mem->in(TypeFunc::Memory);
543 if (sfpt_ctl->is_Proj() && sfpt_ctl->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) {
544 // pin the loads in the uncommon trap path
545 ctl = sfpt_ctl;
546 m = sfpt_mem;
547 }
548 return make_arraycopy_load(mem->as_ArrayCopy(), offset, ctl, m, ft, ftype, alloc);
549 }
550 }
551 // Something go wrong.
552 return NULL;
553 }
554
555 // Check the possibility of scalar replacement.
556 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
557 // Scan the uses of the allocation to check for anything that would
558 // prevent us from eliminating it.
559 NOT_PRODUCT( const char* fail_eliminate = NULL; )
560 DEBUG_ONLY( Node* disq_node = NULL; )
561 bool can_eliminate = true;
562
563 Node* res = alloc->result_cast();
564 const TypeOopPtr* res_type = NULL;
565 if (res == NULL) {
566 // All users were eliminated.
567 } else if (!res->is_CheckCastPP()) {
568 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";)
569 can_eliminate = false;
570 } else {
571 res_type = _igvn.type(res)->isa_oopptr();
572 if (res_type == NULL) {
573 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";)
574 can_eliminate = false;
575 } else if (res_type->isa_aryptr()) {
576 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1);
577 if (length < 0) {
578 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";)
579 can_eliminate = false;
580 }
581 }
582 }
583
584 if (can_eliminate && res != NULL) {
585 for (DUIterator_Fast jmax, j = res->fast_outs(jmax);
586 j < jmax && can_eliminate; j++) {
587 Node* use = res->fast_out(j);
588
589 if (use->is_AddP()) {
590 const TypePtr* addp_type = _igvn.type(use)->is_ptr();
591 int offset = addp_type->offset();
592
593 if (offset == Type::OffsetTop || offset == Type::OffsetBot) {
594 NOT_PRODUCT(fail_eliminate = "Undefined field reference";)
595 can_eliminate = false;
596 break;
597 }
598 for (DUIterator_Fast kmax, k = use->fast_outs(kmax);
599 k < kmax && can_eliminate; k++) {
600 Node* n = use->fast_out(k);
601 if (!n->is_Store() && n->Opcode() != Op_CastP2X
602 SHENANDOAHGC_ONLY(&& (!UseShenandoahGC || !ShenandoahBarrierSetC2::is_shenandoah_wb_pre_call(n))) ) {
603 DEBUG_ONLY(disq_node = n;)
604 if (n->is_Load() || n->is_LoadStore()) {
605 NOT_PRODUCT(fail_eliminate = "Field load";)
606 } else {
615 use->as_ArrayCopy()->is_copyof_validated() ||
616 use->as_ArrayCopy()->is_copyofrange_validated()) &&
617 use->in(ArrayCopyNode::Dest) == res) {
618 // ok to eliminate
619 } else if (use->is_SafePoint()) {
620 SafePointNode* sfpt = use->as_SafePoint();
621 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) {
622 // Object is passed as argument.
623 DEBUG_ONLY(disq_node = use;)
624 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";)
625 can_eliminate = false;
626 }
627 Node* sfptMem = sfpt->memory();
628 if (sfptMem == NULL || sfptMem->is_top()) {
629 DEBUG_ONLY(disq_node = use;)
630 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";)
631 can_eliminate = false;
632 } else {
633 safepoints.append_if_missing(sfpt);
634 }
635 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark
636 if (use->is_Phi()) {
637 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) {
638 NOT_PRODUCT(fail_eliminate = "Object is return value";)
639 } else {
640 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";)
641 }
642 DEBUG_ONLY(disq_node = use;)
643 } else {
644 if (use->Opcode() == Op_Return) {
645 NOT_PRODUCT(fail_eliminate = "Object is return value";)
646 }else {
647 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";)
648 }
649 DEBUG_ONLY(disq_node = use;)
650 }
651 can_eliminate = false;
652 }
653 }
654 }
655
656 #ifndef PRODUCT
657 if (PrintEliminateAllocations) {
658 if (can_eliminate) {
659 tty->print("Scalar ");
660 if (res == NULL)
661 alloc->dump();
662 else
663 res->dump();
664 } else if (alloc->_is_scalar_replaceable) {
665 tty->print("NotScalar (%s)", fail_eliminate);
666 if (res == NULL)
667 alloc->dump();
668 else
669 res->dump();
670 #ifdef ASSERT
671 if (disq_node != NULL) {
672 tty->print(" >>>> ");
673 disq_node->dump();
674 }
675 #endif /*ASSERT*/
676 }
677 }
678 #endif
679 return can_eliminate;
680 }
681
682 // Do scalar replacement.
683 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
684 GrowableArray <SafePointNode *> safepoints_done;
690 BasicType basic_elem_type = T_ILLEGAL;
691 const Type* field_type = NULL;
692
693 Node* res = alloc->result_cast();
694 assert(res == NULL || res->is_CheckCastPP(), "unexpected AllocateNode result");
695 const TypeOopPtr* res_type = NULL;
696 if (res != NULL) { // Could be NULL when there are no users
697 res_type = _igvn.type(res)->isa_oopptr();
698 }
699
700 if (res != NULL) {
701 if (res_type->isa_instptr()) {
702 // find the fields of the class which will be needed for safepoint debug information
703 iklass = res_type->is_instptr()->instance_klass();
704 nfields = iklass->nof_nonstatic_fields();
705 } else {
706 // find the array's elements which will be needed for safepoint debug information
707 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1);
708 assert(nfields >= 0, "must be an array klass.");
709 basic_elem_type = res_type->is_aryptr()->elem()->array_element_basic_type();
710 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
711 element_size = type2aelembytes(basic_elem_type);
712 field_type = res_type->is_aryptr()->elem();
713 }
714 }
715 //
716 // Process the safepoint uses
717 //
718 while (safepoints.length() > 0) {
719 SafePointNode* sfpt = safepoints.pop();
720 Node* mem = sfpt->memory();
721 Node* ctl = sfpt->control();
722 assert(sfpt->jvms() != NULL, "missed JVMS");
723 // Fields of scalar objs are referenced only at the end
724 // of regular debuginfo at the last (youngest) JVMS.
725 // Record relative start index.
726 uint first_ind = (sfpt->req() - sfpt->jvms()->scloff());
727 SafePointScalarObjectNode* sobj = new SafePointScalarObjectNode(res_type,
728 #ifdef ASSERT
729 alloc,
730 #endif
731 first_ind, nfields);
732 sobj->init_req(0, C->root());
733 transform_later(sobj);
734
735 // Scan object's fields adding an input to the safepoint for each field.
736 for (int j = 0; j < nfields; j++) {
737 intptr_t offset;
738 ciField* field = NULL;
739 if (iklass != NULL) {
740 field = iklass->nonstatic_field_at(j);
741 offset = field->offset();
742 ciType* elem_type = field->type();
743 basic_elem_type = field->layout_type();
744
745 // The next code is taken from Parse::do_get_xxx().
746 if (is_reference_type(basic_elem_type)) {
747 if (!elem_type->is_loaded()) {
748 field_type = TypeInstPtr::BOTTOM;
749 } else if (field != NULL && field->is_static_constant()) {
750 ciObject* con = field->constant_value().as_object();
751 // Do not "join" in the previous type; it doesn't add value,
752 // and may yield a vacuous result if the field is of interface type.
753 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
754 assert(field_type != NULL, "field singleton type must be consistent");
755 } else {
756 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
757 }
758 if (UseCompressedOops) {
759 field_type = field_type->make_narrowoop();
760 basic_elem_type = T_NARROWOOP;
761 }
762 } else {
763 field_type = Type::get_const_basic_type(basic_elem_type);
764 }
765 } else {
766 offset = array_base + j * (intptr_t)element_size;
767 }
768
769 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr();
770
771 Node *field_val = value_from_mem(mem, ctl, basic_elem_type, field_type, field_addr_type, alloc);
772 if (field_val == NULL) {
773 // We weren't able to find a value for this field,
774 // give up on eliminating this allocation.
775
776 // Remove any extra entries we added to the safepoint.
777 uint last = sfpt->req() - 1;
778 for (int k = 0; k < j; k++) {
779 sfpt->del_req(last--);
780 }
781 _igvn._worklist.push(sfpt);
782 // rollback processed safepoints
783 while (safepoints_done.length() > 0) {
784 SafePointNode* sfpt_done = safepoints_done.pop();
785 // remove any extra entries we added to the safepoint
786 last = sfpt_done->req() - 1;
787 for (int k = 0; k < nfields; k++) {
788 sfpt_done->del_req(last--);
789 }
790 JVMState *jvms = sfpt_done->jvms();
791 jvms->set_endoff(sfpt_done->req());
814 int field_idx = C->get_alias_index(field_addr_type);
815 tty->print(" (alias_idx=%d)", field_idx);
816 } else { // Array's element
817 tty->print("=== At SafePoint node %d can't find value of array element [%d]",
818 sfpt->_idx, j);
819 }
820 tty->print(", which prevents elimination of: ");
821 if (res == NULL)
822 alloc->dump();
823 else
824 res->dump();
825 }
826 #endif
827 return false;
828 }
829 if (UseCompressedOops && field_type->isa_narrowoop()) {
830 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
831 // to be able scalar replace the allocation.
832 if (field_val->is_EncodeP()) {
833 field_val = field_val->in(1);
834 } else {
835 field_val = transform_later(new DecodeNNode(field_val, field_val->get_ptr_type()));
836 }
837 }
838 sfpt->add_req(field_val);
839 }
840 JVMState *jvms = sfpt->jvms();
841 jvms->set_endoff(sfpt->req());
842 // Now make a pass over the debug information replacing any references
843 // to the allocated object with "sobj"
844 int start = jvms->debug_start();
845 int end = jvms->debug_end();
846 sfpt->replace_edges_in_range(res, sobj, start, end, &_igvn);
847 _igvn._worklist.push(sfpt);
848 safepoints_done.append_if_missing(sfpt); // keep it for rollback
849 }
850 return true;
851 }
852
853 static void disconnect_projections(MultiNode* n, PhaseIterGVN& igvn) {
854 Node* ctl_proj = n->proj_out_or_null(TypeFunc::Control);
855 Node* mem_proj = n->proj_out_or_null(TypeFunc::Memory);
856 if (ctl_proj != NULL) {
857 igvn.replace_node(ctl_proj, n->in(0));
858 }
859 if (mem_proj != NULL) {
860 igvn.replace_node(mem_proj, n->in(TypeFunc::Memory));
861 }
862 }
863
864 // Process users of eliminated allocation.
865 void PhaseMacroExpand::process_users_of_allocation(CallNode *alloc) {
866 Node* res = alloc->result_cast();
867 if (res != NULL) {
868 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) {
869 Node *use = res->last_out(j);
870 uint oc1 = res->outcnt();
871
872 if (use->is_AddP()) {
873 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) {
874 Node *n = use->last_out(k);
875 uint oc2 = use->outcnt();
876 if (n->is_Store()) {
877 #ifdef ASSERT
878 // Verify that there is no dependent MemBarVolatile nodes,
879 // they should be removed during IGVN, see MemBarNode::Ideal().
880 for (DUIterator_Fast pmax, p = n->fast_outs(pmax);
881 p < pmax; p++) {
882 Node* mb = n->fast_out(p);
883 assert(mb->is_Initialize() || !mb->is_MemBar() ||
884 mb->req() <= MemBarNode::Precedent ||
885 mb->in(MemBarNode::Precedent) != n,
886 "MemBarVolatile should be eliminated for non-escaping object");
887 }
888 #endif
889 _igvn.replace_node(n, n->in(MemNode::Memory));
890 } else {
891 eliminate_gc_barrier(n);
892 }
893 k -= (oc2 - use->outcnt());
894 }
895 _igvn.remove_dead_node(use);
896 } else if (use->is_ArrayCopy()) {
897 // Disconnect ArrayCopy node
898 ArrayCopyNode* ac = use->as_ArrayCopy();
899 if (ac->is_clonebasic()) {
900 Node* membar_after = ac->proj_out(TypeFunc::Control)->unique_ctrl_out();
901 disconnect_projections(ac, _igvn);
902 assert(alloc->in(TypeFunc::Memory)->is_Proj() && alloc->in(TypeFunc::Memory)->in(0)->Opcode() == Op_MemBarCPUOrder, "mem barrier expected before allocation");
903 Node* membar_before = alloc->in(TypeFunc::Memory)->in(0);
904 disconnect_projections(membar_before->as_MemBar(), _igvn);
905 if (membar_after->is_MemBar()) {
906 disconnect_projections(membar_after->as_MemBar(), _igvn);
907 }
908 } else {
909 assert(ac->is_arraycopy_validated() ||
910 ac->is_copyof_validated() ||
911 ac->is_copyofrange_validated(), "unsupported");
912 CallProjections callprojs;
913 ac->extract_projections(&callprojs, true);
914
915 _igvn.replace_node(callprojs.fallthrough_ioproj, ac->in(TypeFunc::I_O));
916 _igvn.replace_node(callprojs.fallthrough_memproj, ac->in(TypeFunc::Memory));
917 _igvn.replace_node(callprojs.fallthrough_catchproj, ac->in(TypeFunc::Control));
918
919 // Set control to top. IGVN will remove the remaining projections
920 ac->set_req(0, top());
921 ac->replace_edge(res, top(), &_igvn);
922
923 // Disconnect src right away: it can help find new
924 // opportunities for allocation elimination
925 Node* src = ac->in(ArrayCopyNode::Src);
926 ac->replace_edge(src, top(), &_igvn);
927 // src can be top at this point if src and dest of the
928 // arraycopy were the same
929 if (src->outcnt() == 0 && !src->is_top()) {
930 _igvn.remove_dead_node(src);
931 }
932 }
933 _igvn._worklist.push(ac);
934 } else {
935 eliminate_gc_barrier(use);
936 }
937 j -= (oc1 - res->outcnt());
938 }
939 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted");
940 _igvn.remove_dead_node(res);
941 }
942
943 //
944 // Process other users of allocation's projections
945 //
946 if (_callprojs.resproj != NULL && _callprojs.resproj->outcnt() != 0) {
947 // First disconnect stores captured by Initialize node.
948 // If Initialize node is eliminated first in the following code,
949 // it will kill such stores and DUIterator_Last will assert.
950 for (DUIterator_Fast jmax, j = _callprojs.resproj->fast_outs(jmax); j < jmax; j++) {
951 Node* use = _callprojs.resproj->fast_out(j);
952 if (use->is_AddP()) {
953 // raw memory addresses used only by the initialization
954 _igvn.replace_node(use, C->top());
955 --j; --jmax;
956 }
957 }
958 for (DUIterator_Last jmin, j = _callprojs.resproj->last_outs(jmin); j >= jmin; ) {
959 Node* use = _callprojs.resproj->last_out(j);
960 uint oc1 = _callprojs.resproj->outcnt();
961 if (use->is_Initialize()) {
962 // Eliminate Initialize node.
963 InitializeNode *init = use->as_Initialize();
964 assert(init->outcnt() <= 2, "only a control and memory projection expected");
965 Node *ctrl_proj = init->proj_out_or_null(TypeFunc::Control);
966 if (ctrl_proj != NULL) {
967 _igvn.replace_node(ctrl_proj, init->in(TypeFunc::Control));
968 #ifdef ASSERT
969 // If the InitializeNode has no memory out, it will die, and tmp will become NULL
970 Node* tmp = init->in(TypeFunc::Control);
971 assert(tmp == NULL || tmp == _callprojs.fallthrough_catchproj, "allocation control projection");
972 #endif
973 }
974 Node *mem_proj = init->proj_out_or_null(TypeFunc::Memory);
975 if (mem_proj != NULL) {
976 Node *mem = init->in(TypeFunc::Memory);
977 #ifdef ASSERT
978 if (mem->is_MergeMem()) {
979 assert(mem->in(TypeFunc::Memory) == _callprojs.fallthrough_memproj, "allocation memory projection");
980 } else {
981 assert(mem == _callprojs.fallthrough_memproj, "allocation memory projection");
982 }
983 #endif
984 _igvn.replace_node(mem_proj, mem);
985 }
986 } else {
987 assert(false, "only Initialize or AddP expected");
988 }
989 j -= (oc1 - _callprojs.resproj->outcnt());
990 }
991 }
992 if (_callprojs.fallthrough_catchproj != NULL) {
993 _igvn.replace_node(_callprojs.fallthrough_catchproj, alloc->in(TypeFunc::Control));
994 }
995 if (_callprojs.fallthrough_memproj != NULL) {
996 _igvn.replace_node(_callprojs.fallthrough_memproj, alloc->in(TypeFunc::Memory));
997 }
998 if (_callprojs.catchall_memproj != NULL) {
999 _igvn.replace_node(_callprojs.catchall_memproj, C->top());
1000 }
1001 if (_callprojs.fallthrough_ioproj != NULL) {
1002 _igvn.replace_node(_callprojs.fallthrough_ioproj, alloc->in(TypeFunc::I_O));
1003 }
1004 if (_callprojs.catchall_ioproj != NULL) {
1005 _igvn.replace_node(_callprojs.catchall_ioproj, C->top());
1006 }
1007 if (_callprojs.catchall_catchproj != NULL) {
1008 _igvn.replace_node(_callprojs.catchall_catchproj, C->top());
1009 }
1010 }
1011
1012 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) {
1013 // If reallocation fails during deoptimization we'll pop all
1014 // interpreter frames for this compiled frame and that won't play
1015 // nice with JVMTI popframe.
1016 // We avoid this issue by eager reallocation when the popframe request
1017 // is received.
1018 if (!EliminateAllocations || !alloc->_is_non_escaping) {
1019 return false;
1020 }
1021 Node* klass = alloc->in(AllocateNode::KlassNode);
1022 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr();
1023 Node* res = alloc->result_cast();
1024 // Eliminate boxing allocations which are not used
1025 // regardless scalar replaceable status.
1026 bool boxing_alloc = C->eliminate_boxing() &&
1027 tklass->isa_instklassptr() &&
1028 tklass->is_instklassptr()->instance_klass()->is_box_klass();
1029 if (!alloc->_is_scalar_replaceable && (!boxing_alloc || (res != NULL))) {
1030 return false;
1031 }
1032
1033 alloc->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1034
1035 GrowableArray <SafePointNode *> safepoints;
1036 if (!can_eliminate_allocation(alloc, safepoints)) {
1037 return false;
1038 }
1039
1040 if (!alloc->_is_scalar_replaceable) {
1041 assert(res == NULL, "sanity");
1042 // We can only eliminate allocation if all debug info references
1043 // are already replaced with SafePointScalarObject because
1044 // we can't search for a fields value without instance_id.
1045 if (safepoints.length() > 0) {
1046 return false;
1047 }
1048 }
1049
1050 if (!scalar_replacement(alloc, safepoints)) {
1051 return false;
1052 }
1053
1054 CompileLog* log = C->log();
1055 if (log != NULL) {
1056 log->head("eliminate_allocation type='%d'",
1057 log->identify(tklass->exact_klass()));
1058 JVMState* p = alloc->jvms();
1059 while (p != NULL) {
1060 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1061 p = p->caller();
1062 }
1063 log->tail("eliminate_allocation");
1064 }
1065
1066 process_users_of_allocation(alloc);
1067
1068 #ifndef PRODUCT
1069 if (PrintEliminateAllocations) {
1070 if (alloc->is_AllocateArray())
1071 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1072 else
1073 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1074 }
1075 #endif
1076
1077 return true;
1078 }
1079
1080 bool PhaseMacroExpand::eliminate_boxing_node(CallStaticJavaNode *boxing) {
1081 // EA should remove all uses of non-escaping boxing node.
1082 if (!C->eliminate_boxing() || boxing->proj_out_or_null(TypeFunc::Parms) != NULL) {
1083 return false;
1084 }
1085
1086 assert(boxing->result_cast() == NULL, "unexpected boxing node result");
1087
1088 boxing->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1089
1090 const TypeTuple* r = boxing->tf()->range();
1091 assert(r->cnt() > TypeFunc::Parms, "sanity");
1092 const TypeInstPtr* t = r->field_at(TypeFunc::Parms)->isa_instptr();
1093 assert(t != NULL, "sanity");
1094
1095 CompileLog* log = C->log();
1096 if (log != NULL) {
1097 log->head("eliminate_boxing type='%d'",
1098 log->identify(t->instance_klass()));
1099 JVMState* p = boxing->jvms();
1100 while (p != NULL) {
1101 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1102 p = p->caller();
1103 }
1104 log->tail("eliminate_boxing");
1105 }
1106
1107 process_users_of_allocation(boxing);
1108
1109 #ifndef PRODUCT
1110 if (PrintEliminateAllocations) {
1253 }
1254 }
1255 #endif
1256 yank_alloc_node(alloc);
1257 return;
1258 }
1259 }
1260
1261 enum { too_big_or_final_path = 1, need_gc_path = 2 };
1262 Node *slow_region = NULL;
1263 Node *toobig_false = ctrl;
1264
1265 // generate the initial test if necessary
1266 if (initial_slow_test != NULL ) {
1267 assert (expand_fast_path, "Only need test if there is a fast path");
1268 slow_region = new RegionNode(3);
1269
1270 // Now make the initial failure test. Usually a too-big test but
1271 // might be a TRUE for finalizers or a fancy class check for
1272 // newInstance0.
1273 IfNode *toobig_iff = new IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN);
1274 transform_later(toobig_iff);
1275 // Plug the failing-too-big test into the slow-path region
1276 Node *toobig_true = new IfTrueNode( toobig_iff );
1277 transform_later(toobig_true);
1278 slow_region ->init_req( too_big_or_final_path, toobig_true );
1279 toobig_false = new IfFalseNode( toobig_iff );
1280 transform_later(toobig_false);
1281 } else {
1282 // No initial test, just fall into next case
1283 assert(allocation_has_use || !expand_fast_path, "Should already have been handled");
1284 toobig_false = ctrl;
1285 debug_only(slow_region = NodeSentinel);
1286 }
1287
1288 // If we are here there are several possibilities
1289 // - expand_fast_path is false - then only a slow path is expanded. That's it.
1290 // no_initial_check means a constant allocation.
1291 // - If check always evaluates to false -> expand_fast_path is false (see above)
1292 // - If check always evaluates to true -> directly into fast path (but may bailout to slowpath)
1293 // if !allocation_has_use the fast path is empty
1294 // if !allocation_has_use && no_initial_check
1295 // - Then there are no fastpath that can fall out to slowpath -> no allocation code at all.
1296 // removed by yank_alloc_node above.
1297
1298 Node *slow_mem = mem; // save the current memory state for slow path
1299 // generate the fast allocation code unless we know that the initial test will always go slow
1300 if (expand_fast_path) {
1301 // Fast path modifies only raw memory.
1302 if (mem->is_MergeMem()) {
1303 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
1304 }
1305
1306 // allocate the Region and Phi nodes for the result
1307 result_region = new RegionNode(3);
1308 result_phi_rawmem = new PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM);
1309 result_phi_i_o = new PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch
1310
1311 // Grab regular I/O before optional prefetch may change it.
1312 // Slow-path does no I/O so just set it to the original I/O.
1313 result_phi_i_o->init_req(slow_result_path, i_o);
1314
1315 // Name successful fast-path variables
1316 Node* fast_oop_ctrl;
1317 Node* fast_oop_rawmem;
1318 if (allocation_has_use) {
1319 Node* needgc_ctrl = NULL;
1320 result_phi_rawoop = new PhiNode(result_region, TypeRawPtr::BOTTOM);
1321
1322 intx prefetch_lines = length != NULL ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
1323 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1324 Node* fast_oop = bs->obj_allocate(this, mem, toobig_false, size_in_bytes, i_o, needgc_ctrl,
1325 fast_oop_ctrl, fast_oop_rawmem,
1326 prefetch_lines);
1327
1328 if (initial_slow_test != NULL) {
1329 // This completes all paths into the slow merge point
1330 slow_region->init_req(need_gc_path, needgc_ctrl);
1331 transform_later(slow_region);
1332 } else {
1333 // No initial slow path needed!
1334 // Just fall from the need-GC path straight into the VM call.
1335 slow_region = needgc_ctrl;
1336 }
1337
1355 result_phi_i_o ->init_req(fast_result_path, i_o);
1356 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem);
1357 } else {
1358 slow_region = ctrl;
1359 result_phi_i_o = i_o; // Rename it to use in the following code.
1360 }
1361
1362 // Generate slow-path call
1363 CallNode *call = new CallStaticJavaNode(slow_call_type, slow_call_address,
1364 OptoRuntime::stub_name(slow_call_address),
1365 TypePtr::BOTTOM);
1366 call->init_req(TypeFunc::Control, slow_region);
1367 call->init_req(TypeFunc::I_O, top()); // does no i/o
1368 call->init_req(TypeFunc::Memory, slow_mem); // may gc ptrs
1369 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1370 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1371
1372 call->init_req(TypeFunc::Parms+0, klass_node);
1373 if (length != NULL) {
1374 call->init_req(TypeFunc::Parms+1, length);
1375 }
1376
1377 // Copy debug information and adjust JVMState information, then replace
1378 // allocate node with the call
1379 call->copy_call_debug_info(&_igvn, alloc);
1380 if (expand_fast_path) {
1381 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
1382 } else {
1383 // Hook i_o projection to avoid its elimination during allocation
1384 // replacement (when only a slow call is generated).
1385 call->set_req(TypeFunc::I_O, result_phi_i_o);
1386 }
1387 _igvn.replace_node(alloc, call);
1388 transform_later(call);
1389
1390 // Identify the output projections from the allocate node and
1391 // adjust any references to them.
1392 // The control and io projections look like:
1393 //
1394 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl)
1395 // Allocate Catch
1396 // ^---Proj(io) <-------+ ^---CatchProj(io)
1397 //
1398 // We are interested in the CatchProj nodes.
1399 //
1400 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1401
1402 // An allocate node has separate memory projections for the uses on
1403 // the control and i_o paths. Replace the control memory projection with
1404 // result_phi_rawmem (unless we are only generating a slow call when
1405 // both memory projections are combined)
1406 if (expand_fast_path && _callprojs.fallthrough_memproj != NULL) {
1407 migrate_outs(_callprojs.fallthrough_memproj, result_phi_rawmem);
1408 }
1409 // Now change uses of catchall_memproj to use fallthrough_memproj and delete
1410 // catchall_memproj so we end up with a call that has only 1 memory projection.
1411 if (_callprojs.catchall_memproj != NULL ) {
1412 if (_callprojs.fallthrough_memproj == NULL) {
1413 _callprojs.fallthrough_memproj = new ProjNode(call, TypeFunc::Memory);
1414 transform_later(_callprojs.fallthrough_memproj);
1415 }
1416 migrate_outs(_callprojs.catchall_memproj, _callprojs.fallthrough_memproj);
1417 _igvn.remove_dead_node(_callprojs.catchall_memproj);
1418 }
1419
1420 // An allocate node has separate i_o projections for the uses on the control
1421 // and i_o paths. Always replace the control i_o projection with result i_o
1422 // otherwise incoming i_o become dead when only a slow call is generated
1423 // (it is different from memory projections where both projections are
1424 // combined in such case).
1425 if (_callprojs.fallthrough_ioproj != NULL) {
1426 migrate_outs(_callprojs.fallthrough_ioproj, result_phi_i_o);
1427 }
1428 // Now change uses of catchall_ioproj to use fallthrough_ioproj and delete
1429 // catchall_ioproj so we end up with a call that has only 1 i_o projection.
1430 if (_callprojs.catchall_ioproj != NULL ) {
1431 if (_callprojs.fallthrough_ioproj == NULL) {
1432 _callprojs.fallthrough_ioproj = new ProjNode(call, TypeFunc::I_O);
1433 transform_later(_callprojs.fallthrough_ioproj);
1434 }
1435 migrate_outs(_callprojs.catchall_ioproj, _callprojs.fallthrough_ioproj);
1436 _igvn.remove_dead_node(_callprojs.catchall_ioproj);
1437 }
1438
1439 // if we generated only a slow call, we are done
1440 if (!expand_fast_path) {
1441 // Now we can unhook i_o.
1442 if (result_phi_i_o->outcnt() > 1) {
1443 call->set_req(TypeFunc::I_O, top());
1444 } else {
1445 assert(result_phi_i_o->unique_ctrl_out() == call, "sanity");
1446 // Case of new array with negative size known during compilation.
1447 // AllocateArrayNode::Ideal() optimization disconnect unreachable
1448 // following code since call to runtime will throw exception.
1449 // As result there will be no users of i_o after the call.
1450 // Leave i_o attached to this call to avoid problems in preceding graph.
1451 }
1452 return;
1453 }
1454
1455 if (_callprojs.fallthrough_catchproj != NULL) {
1456 ctrl = _callprojs.fallthrough_catchproj->clone();
1457 transform_later(ctrl);
1458 _igvn.replace_node(_callprojs.fallthrough_catchproj, result_region);
1459 } else {
1460 ctrl = top();
1461 }
1462 Node *slow_result;
1463 if (_callprojs.resproj == NULL) {
1464 // no uses of the allocation result
1465 slow_result = top();
1466 } else {
1467 slow_result = _callprojs.resproj->clone();
1468 transform_later(slow_result);
1469 _igvn.replace_node(_callprojs.resproj, result_phi_rawoop);
1470 }
1471
1472 // Plug slow-path into result merge point
1473 result_region->init_req( slow_result_path, ctrl);
1474 transform_later(result_region);
1475 if (allocation_has_use) {
1476 result_phi_rawoop->init_req(slow_result_path, slow_result);
1477 transform_later(result_phi_rawoop);
1478 }
1479 result_phi_rawmem->init_req(slow_result_path, _callprojs.fallthrough_memproj);
1480 transform_later(result_phi_rawmem);
1481 transform_later(result_phi_i_o);
1482 // This completes all paths into the result merge point
1483 }
1484
1485 // Remove alloc node that has no uses.
1486 void PhaseMacroExpand::yank_alloc_node(AllocateNode* alloc) {
1487 Node* ctrl = alloc->in(TypeFunc::Control);
1488 Node* mem = alloc->in(TypeFunc::Memory);
1489 Node* i_o = alloc->in(TypeFunc::I_O);
1490
1491 alloc->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1492 if (_callprojs.resproj != NULL) {
1493 for (DUIterator_Fast imax, i = _callprojs.resproj->fast_outs(imax); i < imax; i++) {
1494 Node* use = _callprojs.resproj->fast_out(i);
1495 use->isa_MemBar()->remove(&_igvn);
1496 --imax;
1497 --i; // back up iterator
1498 }
1499 assert(_callprojs.resproj->outcnt() == 0, "all uses must be deleted");
1500 _igvn.remove_dead_node(_callprojs.resproj);
1501 }
1502 if (_callprojs.fallthrough_catchproj != NULL) {
1503 migrate_outs(_callprojs.fallthrough_catchproj, ctrl);
1504 _igvn.remove_dead_node(_callprojs.fallthrough_catchproj);
1505 }
1506 if (_callprojs.catchall_catchproj != NULL) {
1507 _igvn.rehash_node_delayed(_callprojs.catchall_catchproj);
1508 _callprojs.catchall_catchproj->set_req(0, top());
1509 }
1510 if (_callprojs.fallthrough_proj != NULL) {
1511 Node* catchnode = _callprojs.fallthrough_proj->unique_ctrl_out();
1512 _igvn.remove_dead_node(catchnode);
1513 _igvn.remove_dead_node(_callprojs.fallthrough_proj);
1514 }
1515 if (_callprojs.fallthrough_memproj != NULL) {
1516 migrate_outs(_callprojs.fallthrough_memproj, mem);
1517 _igvn.remove_dead_node(_callprojs.fallthrough_memproj);
1518 }
1519 if (_callprojs.fallthrough_ioproj != NULL) {
1520 migrate_outs(_callprojs.fallthrough_ioproj, i_o);
1521 _igvn.remove_dead_node(_callprojs.fallthrough_ioproj);
1522 }
1523 if (_callprojs.catchall_memproj != NULL) {
1524 _igvn.rehash_node_delayed(_callprojs.catchall_memproj);
1525 _callprojs.catchall_memproj->set_req(0, top());
1526 }
1527 if (_callprojs.catchall_ioproj != NULL) {
1528 _igvn.rehash_node_delayed(_callprojs.catchall_ioproj);
1529 _callprojs.catchall_ioproj->set_req(0, top());
1530 }
1531 #ifndef PRODUCT
1532 if (PrintEliminateAllocations) {
1533 if (alloc->is_AllocateArray()) {
1534 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1535 } else {
1536 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1537 }
1538 }
1539 #endif
1540 _igvn.remove_dead_node(alloc);
1541 }
1542
1543 void PhaseMacroExpand::expand_initialize_membar(AllocateNode* alloc, InitializeNode* init,
1544 Node*& fast_oop_ctrl, Node*& fast_oop_rawmem) {
1545 // If initialization is performed by an array copy, any required
1546 // MemBarStoreStore was already added. If the object does not
1547 // escape no need for a MemBarStoreStore. If the object does not
1548 // escape in its initializer and memory barrier (MemBarStoreStore or
1549 // stronger) is already added at exit of initializer, also no need
1627 Node* thread = new ThreadLocalNode();
1628 transform_later(thread);
1629
1630 call->init_req(TypeFunc::Parms + 0, thread);
1631 call->init_req(TypeFunc::Parms + 1, oop);
1632 call->init_req(TypeFunc::Control, ctrl);
1633 call->init_req(TypeFunc::I_O , top()); // does no i/o
1634 call->init_req(TypeFunc::Memory , rawmem);
1635 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1636 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1637 transform_later(call);
1638 ctrl = new ProjNode(call, TypeFunc::Control);
1639 transform_later(ctrl);
1640 rawmem = new ProjNode(call, TypeFunc::Memory);
1641 transform_later(rawmem);
1642 }
1643 }
1644
1645 // Helper for PhaseMacroExpand::expand_allocate_common.
1646 // Initializes the newly-allocated storage.
1647 Node*
1648 PhaseMacroExpand::initialize_object(AllocateNode* alloc,
1649 Node* control, Node* rawmem, Node* object,
1650 Node* klass_node, Node* length,
1651 Node* size_in_bytes) {
1652 InitializeNode* init = alloc->initialization();
1653 // Store the klass & mark bits
1654 Node* mark_node = alloc->make_ideal_mark(&_igvn, object, control, rawmem);
1655 if (!mark_node->is_Con()) {
1656 transform_later(mark_node);
1657 }
1658 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, TypeX_X->basic_type());
1659
1660 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
1661 int header_size = alloc->minimum_header_size(); // conservatively small
1662
1663 // Array length
1664 if (length != NULL) { // Arrays need length field
1665 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
1666 // conservatively small header size:
1667 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1668 if (_igvn.type(klass_node)->isa_aryklassptr()) { // we know the exact header size in most cases:
1669 BasicType elem = _igvn.type(klass_node)->is_klassptr()->as_instance_type()->isa_aryptr()->elem()->array_element_basic_type();
1670 if (is_reference_type(elem, true)) {
1671 elem = T_OBJECT;
1672 }
1673 header_size = Klass::layout_helper_header_size(Klass::array_layout_helper(elem));
1674 }
1675 }
1676
1677 // Clear the object body, if necessary.
1678 if (init == NULL) {
1679 // The init has somehow disappeared; be cautious and clear everything.
1680 //
1681 // This can happen if a node is allocated but an uncommon trap occurs
1682 // immediately. In this case, the Initialize gets associated with the
1683 // trap, and may be placed in a different (outer) loop, if the Allocate
1684 // is in a loop. If (this is rare) the inner loop gets unrolled, then
1685 // there can be two Allocates to one Initialize. The answer in all these
1686 // edge cases is safety first. It is always safe to clear immediately
1687 // within an Allocate, and then (maybe or maybe not) clear some more later.
1688 if (!(UseTLAB && ZeroTLAB)) {
1689 rawmem = ClearArrayNode::clear_memory(control, rawmem, object,
1690 header_size, size_in_bytes,
1691 &_igvn);
1692 }
1693 } else {
1694 if (!init->is_complete()) {
1695 // Try to win by zeroing only what the init does not store.
1696 // We can also try to do some peephole optimizations,
1697 // such as combining some adjacent subword stores.
1698 rawmem = init->complete_stores(control, rawmem, object,
1699 header_size, size_in_bytes, &_igvn);
1700 }
1701 // We have no more use for this link, since the AllocateNode goes away:
1702 init->set_req(InitializeNode::RawAddress, top());
1703 // (If we keep the link, it just confuses the register allocator,
1704 // who thinks he sees a real use of the address by the membar.)
1705 }
1706
1707 return rawmem;
1708 }
1709
2038 } // EliminateNestedLocks
2039
2040 if (alock->is_non_esc_obj()) { // Lock is used for non escaping object
2041 // Look for all locks of this object and mark them and
2042 // corresponding BoxLock nodes as eliminated.
2043 Node* obj = alock->obj_node();
2044 for (uint j = 0; j < obj->outcnt(); j++) {
2045 Node* o = obj->raw_out(j);
2046 if (o->is_AbstractLock() &&
2047 o->as_AbstractLock()->obj_node()->eqv_uncast(obj)) {
2048 alock = o->as_AbstractLock();
2049 Node* box = alock->box_node();
2050 // Replace old box node with new eliminated box for all users
2051 // of the same object and mark related locks as eliminated.
2052 mark_eliminated_box(box, obj);
2053 }
2054 }
2055 }
2056 }
2057
2058 // we have determined that this lock/unlock can be eliminated, we simply
2059 // eliminate the node without expanding it.
2060 //
2061 // Note: The membar's associated with the lock/unlock are currently not
2062 // eliminated. This should be investigated as a future enhancement.
2063 //
2064 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) {
2065
2066 if (!alock->is_eliminated()) {
2067 return false;
2068 }
2069 #ifdef ASSERT
2070 if (!alock->is_coarsened()) {
2071 // Check that new "eliminated" BoxLock node is created.
2072 BoxLockNode* oldbox = alock->box_node()->as_BoxLock();
2073 assert(oldbox->is_eliminated(), "should be done already");
2074 }
2075 #endif
2076
2077 alock->log_lock_optimization(C, "eliminate_lock");
2078
2079 #ifndef PRODUCT
2080 if (PrintEliminateLocks) {
2081 tty->print_cr("++++ Eliminated: %d %s '%s'", alock->_idx, (alock->is_Lock() ? "Lock" : "Unlock"), alock->kind_as_string());
2082 }
2083 #endif
2084
2085 Node* mem = alock->in(TypeFunc::Memory);
2086 Node* ctrl = alock->in(TypeFunc::Control);
2087 guarantee(ctrl != NULL, "missing control projection, cannot replace_node() with NULL");
2088
2089 alock->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2090 // There are 2 projections from the lock. The lock node will
2091 // be deleted when its last use is subsumed below.
2092 assert(alock->outcnt() == 2 &&
2093 _callprojs.fallthrough_proj != NULL &&
2094 _callprojs.fallthrough_memproj != NULL,
2095 "Unexpected projections from Lock/Unlock");
2096
2097 Node* fallthroughproj = _callprojs.fallthrough_proj;
2098 Node* memproj_fallthrough = _callprojs.fallthrough_memproj;
2099
2100 // The memory projection from a lock/unlock is RawMem
2101 // The input to a Lock is merged memory, so extract its RawMem input
2102 // (unless the MergeMem has been optimized away.)
2103 if (alock->is_Lock()) {
2104 // Search for MemBarAcquireLock node and delete it also.
2105 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar();
2106 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquireLock, "");
2107 Node* ctrlproj = membar->proj_out(TypeFunc::Control);
2108 Node* memproj = membar->proj_out(TypeFunc::Memory);
2109 _igvn.replace_node(ctrlproj, fallthroughproj);
2110 _igvn.replace_node(memproj, memproj_fallthrough);
2111
2112 // Delete FastLock node also if this Lock node is unique user
2113 // (a loop peeling may clone a Lock node).
2114 Node* flock = alock->as_Lock()->fastlock_node();
2115 if (flock->outcnt() == 1) {
2116 assert(flock->unique_out() == alock, "sanity");
2117 _igvn.replace_node(flock, top());
2118 }
2119 }
2120
2121 // Search for MemBarReleaseLock node and delete it also.
2122 if (alock->is_Unlock() && ctrl->is_Proj() && ctrl->in(0)->is_MemBar()) {
2123 MemBarNode* membar = ctrl->in(0)->as_MemBar();
2144 Node* mem = lock->in(TypeFunc::Memory);
2145 Node* obj = lock->obj_node();
2146 Node* box = lock->box_node();
2147 Node* flock = lock->fastlock_node();
2148
2149 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2150
2151 // Make the merge point
2152 Node *region;
2153 Node *mem_phi;
2154 Node *slow_path;
2155
2156 region = new RegionNode(3);
2157 // create a Phi for the memory state
2158 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2159
2160 // Optimize test; set region slot 2
2161 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0);
2162 mem_phi->init_req(2, mem);
2163
2164 // Make slow path call
2165 CallNode *call = make_slow_call((CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(),
2166 OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path,
2167 obj, box, NULL);
2168
2169 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2170
2171 // Slow path can only throw asynchronous exceptions, which are always
2172 // de-opted. So the compiler thinks the slow-call can never throw an
2173 // exception. If it DOES throw an exception we would need the debug
2174 // info removed first (since if it throws there is no monitor).
2175 assert(_callprojs.fallthrough_ioproj == NULL && _callprojs.catchall_ioproj == NULL &&
2176 _callprojs.catchall_memproj == NULL && _callprojs.catchall_catchproj == NULL, "Unexpected projection from Lock");
2177
2178 // Capture slow path
2179 // disconnect fall-through projection from call and create a new one
2180 // hook up users of fall-through projection to region
2181 Node *slow_ctrl = _callprojs.fallthrough_proj->clone();
2182 transform_later(slow_ctrl);
2183 _igvn.hash_delete(_callprojs.fallthrough_proj);
2184 _callprojs.fallthrough_proj->disconnect_inputs(C);
2185 region->init_req(1, slow_ctrl);
2186 // region inputs are now complete
2187 transform_later(region);
2188 _igvn.replace_node(_callprojs.fallthrough_proj, region);
2189
2190 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2191
2192 mem_phi->init_req(1, memproj);
2193
2194 transform_later(mem_phi);
2195
2196 _igvn.replace_node(_callprojs.fallthrough_memproj, mem_phi);
2197 }
2198
2199 //------------------------------expand_unlock_node----------------------
2200 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {
2201
2202 Node* ctrl = unlock->in(TypeFunc::Control);
2203 Node* mem = unlock->in(TypeFunc::Memory);
2204 Node* obj = unlock->obj_node();
2205 Node* box = unlock->box_node();
2206
2207 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2208
2209 // No need for a null check on unlock
2210
2211 // Make the merge point
2212 Node *region;
2213 Node *mem_phi;
2214
2215 region = new RegionNode(3);
2216 // create a Phi for the memory state
2217 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2218
2219 FastUnlockNode *funlock = new FastUnlockNode( ctrl, obj, box );
2220 funlock = transform_later( funlock )->as_FastUnlock();
2221 // Optimize test; set region slot 2
2222 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0);
2223 Node *thread = transform_later(new ThreadLocalNode());
2224
2225 CallNode *call = make_slow_call((CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(),
2226 CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C),
2227 "complete_monitor_unlocking_C", slow_path, obj, box, thread);
2228
2229 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2230 assert(_callprojs.fallthrough_ioproj == NULL && _callprojs.catchall_ioproj == NULL &&
2231 _callprojs.catchall_memproj == NULL && _callprojs.catchall_catchproj == NULL, "Unexpected projection from Lock");
2232
2233 // No exceptions for unlocking
2234 // Capture slow path
2235 // disconnect fall-through projection from call and create a new one
2236 // hook up users of fall-through projection to region
2237 Node *slow_ctrl = _callprojs.fallthrough_proj->clone();
2238 transform_later(slow_ctrl);
2239 _igvn.hash_delete(_callprojs.fallthrough_proj);
2240 _callprojs.fallthrough_proj->disconnect_inputs(C);
2241 region->init_req(1, slow_ctrl);
2242 // region inputs are now complete
2243 transform_later(region);
2244 _igvn.replace_node(_callprojs.fallthrough_proj, region);
2245
2246 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory) );
2247 mem_phi->init_req(1, memproj );
2248 mem_phi->init_req(2, mem);
2249 transform_later(mem_phi);
2250
2251 _igvn.replace_node(_callprojs.fallthrough_memproj, mem_phi);
2252 }
2253
2254 void PhaseMacroExpand::expand_subtypecheck_node(SubTypeCheckNode *check) {
2255 assert(check->in(SubTypeCheckNode::Control) == NULL, "should be pinned");
2256 Node* bol = check->unique_out();
2257 Node* obj_or_subklass = check->in(SubTypeCheckNode::ObjOrSubKlass);
2258 Node* superklass = check->in(SubTypeCheckNode::SuperKlass);
2259 assert(bol->is_Bool() && bol->as_Bool()->_test._test == BoolTest::ne, "unexpected bool node");
2260
2261 for (DUIterator_Last imin, i = bol->last_outs(imin); i >= imin; --i) {
2262 Node* iff = bol->last_out(i);
2263 assert(iff->is_If(), "where's the if?");
2264
2265 if (iff->in(0)->is_top()) {
2266 _igvn.replace_input_of(iff, 1, C->top());
2267 continue;
2268 }
2269
2270 Node* iftrue = iff->as_If()->proj_out(1);
2271 Node* iffalse = iff->as_If()->proj_out(0);
2272 Node* ctrl = iff->in(0);
2273
2274 Node* subklass = NULL;
2275 if (_igvn.type(obj_or_subklass)->isa_klassptr()) {
2276 subklass = obj_or_subklass;
2277 } else {
2278 Node* k_adr = basic_plus_adr(obj_or_subklass, oopDesc::klass_offset_in_bytes());
2279 subklass = _igvn.transform(LoadKlassNode::make(_igvn, NULL, C->immutable_memory(), k_adr, TypeInstPtr::KLASS));
2280 }
2281
2282 Node* not_subtype_ctrl = Phase::gen_subtype_check(subklass, superklass, &ctrl, NULL, _igvn);
2283
2284 _igvn.replace_input_of(iff, 0, C->top());
2285 _igvn.replace_node(iftrue, not_subtype_ctrl);
2286 _igvn.replace_node(iffalse, ctrl);
2287 }
2288 _igvn.replace_node(check, C->top());
2289 }
2290
2291 //---------------------------eliminate_macro_nodes----------------------
2292 // Eliminate scalar replaced allocations and associated locks.
2293 void PhaseMacroExpand::eliminate_macro_nodes() {
2294 if (C->macro_count() == 0)
2295 return;
2296 NOT_PRODUCT(int membar_before = count_MemBar(C);)
2297
2298 // Before elimination may re-mark (change to Nested or NonEscObj)
2299 // all associated (same box and obj) lock and unlock nodes.
2300 int cnt = C->macro_count();
2301 for (int i=0; i < cnt; i++) {
2302 Node *n = C->macro_node(i);
2303 if (n->is_AbstractLock()) { // Lock and Unlock nodes
2304 mark_eliminated_locking_nodes(n->as_AbstractLock());
2305 }
2306 }
2307 // Re-marking may break consistency of Coarsened locks.
2308 if (!C->coarsened_locks_consistent()) {
2309 return; // recompile without Coarsened locks if broken
2310 }
2331 }
2332 // Next, attempt to eliminate allocations
2333 _has_locks = false;
2334 progress = true;
2335 while (progress) {
2336 progress = false;
2337 for (int i = C->macro_count(); i > 0; i = MIN2(i - 1, C->macro_count())) { // more than 1 element can be eliminated at once
2338 Node* n = C->macro_node(i - 1);
2339 bool success = false;
2340 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2341 switch (n->class_id()) {
2342 case Node::Class_Allocate:
2343 case Node::Class_AllocateArray:
2344 success = eliminate_allocate_node(n->as_Allocate());
2345 #ifndef PRODUCT
2346 if (success && PrintOptoStatistics) {
2347 Atomic::inc(&PhaseMacroExpand::_objs_scalar_replaced_counter);
2348 }
2349 #endif
2350 break;
2351 case Node::Class_CallStaticJava:
2352 success = eliminate_boxing_node(n->as_CallStaticJava());
2353 break;
2354 case Node::Class_Lock:
2355 case Node::Class_Unlock:
2356 assert(!n->as_AbstractLock()->is_eliminated(), "sanity");
2357 _has_locks = true;
2358 break;
2359 case Node::Class_ArrayCopy:
2360 break;
2361 case Node::Class_OuterStripMinedLoop:
2362 break;
2363 case Node::Class_SubTypeCheck:
2364 break;
2365 case Node::Class_Opaque1:
2366 break;
2367 default:
2368 assert(n->Opcode() == Op_LoopLimit ||
2369 n->Opcode() == Op_Opaque2 ||
2370 n->Opcode() == Op_Opaque3 ||
2371 n->Opcode() == Op_Opaque4 ||
2372 BarrierSet::barrier_set()->barrier_set_c2()->is_gc_barrier_node(n),
2373 "unknown node type in macro list");
2374 }
2375 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2376 progress = progress || success;
2377 }
2378 }
2379 #ifndef PRODUCT
2380 if (PrintOptoStatistics) {
2381 int membar_after = count_MemBar(C);
2382 Atomic::add(&PhaseMacroExpand::_memory_barriers_removed_counter, membar_before - membar_after);
2383 }
2384 #endif
2385 }
2386
2388 // Returns true if a failure occurred.
2389 bool PhaseMacroExpand::expand_macro_nodes() {
2390 // Last attempt to eliminate macro nodes.
2391 eliminate_macro_nodes();
2392 if (C->failing()) return true;
2393
2394 // Eliminate Opaque and LoopLimit nodes. Do it after all loop optimizations.
2395 bool progress = true;
2396 while (progress) {
2397 progress = false;
2398 for (int i = C->macro_count(); i > 0; i--) {
2399 Node* n = C->macro_node(i-1);
2400 bool success = false;
2401 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2402 if (n->Opcode() == Op_LoopLimit) {
2403 // Remove it from macro list and put on IGVN worklist to optimize.
2404 C->remove_macro_node(n);
2405 _igvn._worklist.push(n);
2406 success = true;
2407 } else if (n->Opcode() == Op_CallStaticJava) {
2408 // Remove it from macro list and put on IGVN worklist to optimize.
2409 C->remove_macro_node(n);
2410 _igvn._worklist.push(n);
2411 success = true;
2412 } else if (n->is_Opaque1() || n->Opcode() == Op_Opaque2) {
2413 _igvn.replace_node(n, n->in(1));
2414 success = true;
2415 #if INCLUDE_RTM_OPT
2416 } else if ((n->Opcode() == Op_Opaque3) && ((Opaque3Node*)n)->rtm_opt()) {
2417 assert(C->profile_rtm(), "should be used only in rtm deoptimization code");
2418 assert((n->outcnt() == 1) && n->unique_out()->is_Cmp(), "");
2419 Node* cmp = n->unique_out();
2420 #ifdef ASSERT
2421 // Validate graph.
2422 assert((cmp->outcnt() == 1) && cmp->unique_out()->is_Bool(), "");
2423 BoolNode* bol = cmp->unique_out()->as_Bool();
2424 assert((bol->outcnt() == 1) && bol->unique_out()->is_If() &&
2425 (bol->_test._test == BoolTest::ne), "");
2426 IfNode* ifn = bol->unique_out()->as_If();
2427 assert((ifn->outcnt() == 2) &&
2428 ifn->proj_out(1)->is_uncommon_trap_proj(Deoptimization::Reason_rtm_state_change) != NULL, "");
2429 #endif
2430 Node* repl = n->in(1);
2431 if (!_has_locks) {
2494 // Worst case is a macro node gets expanded into about 200 nodes.
2495 // Allow 50% more for optimization.
2496 if (C->check_node_count(300, "out of nodes before macro expansion")) {
2497 return true;
2498 }
2499
2500 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2501 switch (n->class_id()) {
2502 case Node::Class_Lock:
2503 expand_lock_node(n->as_Lock());
2504 break;
2505 case Node::Class_Unlock:
2506 expand_unlock_node(n->as_Unlock());
2507 break;
2508 case Node::Class_ArrayCopy:
2509 expand_arraycopy_node(n->as_ArrayCopy());
2510 break;
2511 case Node::Class_SubTypeCheck:
2512 expand_subtypecheck_node(n->as_SubTypeCheck());
2513 break;
2514 default:
2515 assert(false, "unknown node type in macro list");
2516 }
2517 assert(C->macro_count() == (old_macro_count - 1), "expansion must have deleted one node from macro list");
2518 if (C->failing()) return true;
2519
2520 // Clean up the graph so we're less likely to hit the maximum node
2521 // limit
2522 _igvn.set_delay_transform(false);
2523 _igvn.optimize();
2524 if (C->failing()) return true;
2525 _igvn.set_delay_transform(true);
2526 }
2527
2528 // All nodes except Allocate nodes are expanded now. There could be
2529 // new optimization opportunities (such as folding newly created
2530 // load from a just allocated object). Run IGVN.
2531
2532 // expand "macro" nodes
2533 // nodes are removed from the macro list as they are processed
|
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 "precompiled.hpp"
26 #include "ci/ciFlatArrayKlass.hpp"
27 #include "compiler/compileLog.hpp"
28 #include "gc/shared/collectedHeap.inline.hpp"
29 #include "gc/shared/tlab_globals.hpp"
30 #include "libadt/vectset.hpp"
31 #include "memory/universe.hpp"
32 #include "opto/addnode.hpp"
33 #include "opto/arraycopynode.hpp"
34 #include "opto/callnode.hpp"
35 #include "opto/castnode.hpp"
36 #include "opto/cfgnode.hpp"
37 #include "opto/compile.hpp"
38 #include "opto/convertnode.hpp"
39 #include "opto/graphKit.hpp"
40 #include "opto/inlinetypenode.hpp"
41 #include "opto/intrinsicnode.hpp"
42 #include "opto/locknode.hpp"
43 #include "opto/loopnode.hpp"
44 #include "opto/macro.hpp"
45 #include "opto/memnode.hpp"
46 #include "opto/narrowptrnode.hpp"
47 #include "opto/node.hpp"
48 #include "opto/opaquenode.hpp"
49 #include "opto/phaseX.hpp"
50 #include "opto/rootnode.hpp"
51 #include "opto/runtime.hpp"
52 #include "opto/subnode.hpp"
53 #include "opto/subtypenode.hpp"
54 #include "opto/type.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "runtime/continuation.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/powerOfTwo.hpp"
61 #if INCLUDE_G1GC
62 #include "gc/g1/g1ThreadLocalData.hpp"
63 #endif // INCLUDE_G1GC
64 #if INCLUDE_SHENANDOAHGC
65 #include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp"
66 #endif
67
68
69 //
70 // Replace any references to "oldref" in inputs to "use" with "newref".
71 // Returns the number of replacements made.
72 //
73 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) {
74 int nreplacements = 0;
75 uint req = use->req();
76 for (uint j = 0; j < use->len(); j++) {
77 Node *uin = use->in(j);
78 if (uin == oldref) {
79 if (j < req)
80 use->set_req(j, newref);
81 else
82 use->set_prec(j, newref);
83 nreplacements++;
84 } else if (j >= req && uin == NULL) {
85 break;
86 }
87 }
88 return nreplacements;
89 }
90
91 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word, int mask, int bits, bool return_fast_path) {
92 Node* cmp;
93 if (mask != 0) {
94 Node* and_node = transform_later(new AndXNode(word, MakeConX(mask)));
95 cmp = transform_later(new CmpXNode(and_node, MakeConX(bits)));
96 } else {
97 cmp = word;
98 }
99 Node* bol = transform_later(new BoolNode(cmp, BoolTest::ne));
100 IfNode* iff = new IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
101 transform_later(iff);
102
103 // Fast path taken.
104 Node *fast_taken = transform_later(new IfFalseNode(iff));
105
106 // Fast path not-taken, i.e. slow path
107 Node *slow_taken = transform_later(new IfTrueNode(iff));
108
109 if (return_fast_path) {
110 region->init_req(edge, slow_taken); // Capture slow-control
133 // Slow-path call
134 CallNode *call = leaf_name
135 ? (CallNode*)new CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM )
136 : (CallNode*)new CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), TypeRawPtr::BOTTOM );
137
138 // Slow path call has no side-effects, uses few values
139 copy_predefined_input_for_runtime_call(slow_path, oldcall, call );
140 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0);
141 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1);
142 if (parm2 != NULL) call->init_req(TypeFunc::Parms+2, parm2);
143 call->copy_call_debug_info(&_igvn, oldcall);
144 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
145 _igvn.replace_node(oldcall, call);
146 transform_later(call);
147
148 return call;
149 }
150
151 void PhaseMacroExpand::eliminate_gc_barrier(Node* p2x) {
152 BarrierSetC2 *bs = BarrierSet::barrier_set()->barrier_set_c2();
153 bs->eliminate_gc_barrier(&_igvn, p2x);
154 #ifndef PRODUCT
155 if (PrintOptoStatistics) {
156 Atomic::inc(&PhaseMacroExpand::_GC_barriers_removed_counter);
157 }
158 #endif
159 }
160
161 // Search for a memory operation for the specified memory slice.
162 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) {
163 Node *orig_mem = mem;
164 Node *alloc_mem = alloc->in(TypeFunc::Memory);
165 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr();
166 while (true) {
167 if (mem == alloc_mem || mem == start_mem ) {
168 return mem; // hit one of our sentinels
169 } else if (mem->is_MergeMem()) {
170 mem = mem->as_MergeMem()->memory_at(alias_idx);
171 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) {
172 Node *in = mem->in(0);
173 // we can safely skip over safepoints, calls, locks and membars because we
187 ArrayCopyNode* ac = NULL;
188 if (ArrayCopyNode::may_modify(tinst, in->as_MemBar(), phase, ac)) {
189 if (ac != NULL) {
190 assert(ac->is_clonebasic(), "Only basic clone is a non escaping clone");
191 return ac;
192 }
193 }
194 mem = in->in(TypeFunc::Memory);
195 } else {
196 #ifdef ASSERT
197 in->dump();
198 mem->dump();
199 assert(false, "unexpected projection");
200 #endif
201 }
202 } else if (mem->is_Store()) {
203 const TypePtr* atype = mem->as_Store()->adr_type();
204 int adr_idx = phase->C->get_alias_index(atype);
205 if (adr_idx == alias_idx) {
206 assert(atype->isa_oopptr(), "address type must be oopptr");
207 int adr_offset = atype->flattened_offset();
208 uint adr_iid = atype->is_oopptr()->instance_id();
209 // Array elements references have the same alias_idx
210 // but different offset and different instance_id.
211 if (adr_offset == offset && adr_iid == alloc->_idx) {
212 return mem;
213 }
214 } else {
215 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw");
216 }
217 mem = mem->in(MemNode::Memory);
218 } else if (mem->is_ClearArray()) {
219 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) {
220 // Can not bypass initialization of the instance
221 // we are looking.
222 debug_only(intptr_t offset;)
223 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity");
224 InitializeNode* init = alloc->as_Allocate()->initialization();
225 // We are looking for stored value, return Initialize node
226 // or memory edge from Allocate node.
227 if (init != NULL) {
232 }
233 // Otherwise skip it (the call updated 'mem' value).
234 } else if (mem->Opcode() == Op_SCMemProj) {
235 mem = mem->in(0);
236 Node* adr = NULL;
237 if (mem->is_LoadStore()) {
238 adr = mem->in(MemNode::Address);
239 } else {
240 assert(mem->Opcode() == Op_EncodeISOArray ||
241 mem->Opcode() == Op_StrCompressedCopy, "sanity");
242 adr = mem->in(3); // Destination array
243 }
244 const TypePtr* atype = adr->bottom_type()->is_ptr();
245 int adr_idx = phase->C->get_alias_index(atype);
246 if (adr_idx == alias_idx) {
247 DEBUG_ONLY(mem->dump();)
248 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
249 return NULL;
250 }
251 mem = mem->in(MemNode::Memory);
252 } else if (mem->Opcode() == Op_StrInflatedCopy) {
253 Node* adr = mem->in(3); // Destination array
254 const TypePtr* atype = adr->bottom_type()->is_ptr();
255 int adr_idx = phase->C->get_alias_index(atype);
256 if (adr_idx == alias_idx) {
257 DEBUG_ONLY(mem->dump();)
258 assert(false, "Object is not scalar replaceable if a StrInflatedCopy node accesses its field");
259 return NULL;
260 }
261 mem = mem->in(MemNode::Memory);
262 } else {
263 return mem;
264 }
265 assert(mem != orig_mem, "dead memory loop");
266 }
267 }
268
269 // Generate loads from source of the arraycopy for fields of
270 // destination needed at a deoptimization point
271 Node* PhaseMacroExpand::make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, Node* mem, BasicType ft, const Type *ftype, AllocateNode *alloc) {
272 BasicType bt = ft;
277 }
278 Node* res = NULL;
279 if (ac->is_clonebasic()) {
280 assert(ac->in(ArrayCopyNode::Src) != ac->in(ArrayCopyNode::Dest), "clone source equals destination");
281 Node* base = ac->in(ArrayCopyNode::Src);
282 Node* adr = _igvn.transform(new AddPNode(base, base, MakeConX(offset)));
283 const TypePtr* adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
284 MergeMemNode* mergemen = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
285 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
286 res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemen, adr, adr_type, type, bt);
287 } else {
288 if (ac->modifies(offset, offset, &_igvn, true)) {
289 assert(ac->in(ArrayCopyNode::Dest) == alloc->result_cast(), "arraycopy destination should be allocation's result");
290 uint shift = exact_log2(type2aelembytes(bt));
291 Node* src_pos = ac->in(ArrayCopyNode::SrcPos);
292 Node* dest_pos = ac->in(ArrayCopyNode::DestPos);
293 const TypeInt* src_pos_t = _igvn.type(src_pos)->is_int();
294 const TypeInt* dest_pos_t = _igvn.type(dest_pos)->is_int();
295
296 Node* adr = NULL;
297 Node* base = ac->in(ArrayCopyNode::Src);
298 const TypeAryPtr* adr_type = _igvn.type(base)->is_aryptr();
299 if (adr_type->is_aryptr()->is_flat()) {
300 shift = adr_type->flat_log_elem_size();
301 }
302 if (src_pos_t->is_con() && dest_pos_t->is_con()) {
303 intptr_t off = ((src_pos_t->get_con() - dest_pos_t->get_con()) << shift) + offset;
304 adr = _igvn.transform(new AddPNode(base, base, MakeConX(off)));
305 adr_type = _igvn.type(adr)->is_aryptr();
306 assert(adr_type == _igvn.type(base)->is_aryptr()->add_field_offset_and_offset(off), "incorrect address type");
307 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
308 // Don't emit a new load from src if src == dst but try to get the value from memory instead
309 return value_from_mem(ac->in(TypeFunc::Memory), ctl, ft, ftype, adr_type, alloc);
310 }
311 } else {
312 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
313 // Non constant offset in the array: we can't statically
314 // determine the value
315 return NULL;
316 }
317 Node* diff = _igvn.transform(new SubINode(ac->in(ArrayCopyNode::SrcPos), ac->in(ArrayCopyNode::DestPos)));
318 #ifdef _LP64
319 diff = _igvn.transform(new ConvI2LNode(diff));
320 #endif
321 diff = _igvn.transform(new LShiftXNode(diff, intcon(shift)));
322
323 Node* off = _igvn.transform(new AddXNode(MakeConX(offset), diff));
324 adr = _igvn.transform(new AddPNode(base, base, off));
325 // In the case of a flattened inline type array, each field has its
326 // own slice so we need to extract the field being accessed from
327 // the address computation
328 adr_type = adr_type->add_field_offset_and_offset(offset)->add_offset(Type::OffsetBot)->is_aryptr();
329 adr = _igvn.transform(new CastPPNode(adr, adr_type));
330 }
331 MergeMemNode* mergemen = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
332 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
333 res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemen, adr, adr_type, type, bt);
334 }
335 }
336 if (res != NULL) {
337 if (ftype->isa_narrowoop()) {
338 // PhaseMacroExpand::scalar_replacement adds DecodeN nodes
339 assert(res->isa_DecodeN(), "should be narrow oop");
340 res = _igvn.transform(new EncodePNode(res, ftype));
341 }
342 return res;
343 }
344 return NULL;
345 }
346
347 //
348 // Given a Memory Phi, compute a value Phi containing the values from stores
349 // on the input paths.
350 // Note: this function is recursive, its depth is limited by the "level" argument
351 // Returns the computed Phi, or NULL if it cannot compute it.
352 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) {
353 assert(mem->is_Phi(), "sanity");
354 int alias_idx = C->get_alias_index(adr_t);
355 int offset = adr_t->flattened_offset();
356 int instance_id = adr_t->instance_id();
357
358 // Check if an appropriate value phi already exists.
359 Node* region = mem->in(0);
360 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) {
361 Node* phi = region->fast_out(k);
362 if (phi->is_Phi() && phi != mem &&
363 phi->as_Phi()->is_same_inst_field(phi_type, (int)mem->_idx, instance_id, alias_idx, offset)) {
364 return phi;
365 }
366 }
367 // Check if an appropriate new value phi already exists.
368 Node* new_phi = value_phis->find(mem->_idx);
369 if (new_phi != NULL)
370 return new_phi;
371
372 if (level <= 0) {
373 return NULL; // Give up: phi tree too deep
374 }
375 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
376 Node *alloc_mem = alloc->in(TypeFunc::Memory);
377
378 uint length = mem->req();
379 GrowableArray <Node *> values(length, length, NULL);
380
381 // create a new Phi for the value
382 PhiNode *phi = new PhiNode(mem->in(0), phi_type, NULL, mem->_idx, instance_id, alias_idx, offset);
383 transform_later(phi);
384 value_phis->push(phi, mem->_idx);
385
386 for (uint j = 1; j < length; j++) {
387 Node *in = mem->in(j);
388 if (in == NULL || in->is_top()) {
389 values.at_put(j, in);
390 } else {
391 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn);
392 if (val == start_mem || val == alloc_mem) {
393 // hit a sentinel, return appropriate 0 value
394 Node* default_value = alloc->in(AllocateNode::DefaultValue);
395 if (default_value != NULL) {
396 values.at_put(j, default_value);
397 } else {
398 assert(alloc->in(AllocateNode::RawDefaultValue) == NULL, "default value may not be null");
399 values.at_put(j, _igvn.zerocon(ft));
400 }
401 continue;
402 }
403 if (val->is_Initialize()) {
404 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
405 }
406 if (val == NULL) {
407 return NULL; // can't find a value on this path
408 }
409 if (val == mem) {
410 values.at_put(j, mem);
411 } else if (val->is_Store()) {
412 Node* n = val->in(MemNode::ValueIn);
413 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
414 n = bs->step_over_gc_barrier(n);
415 if (is_subword_type(ft)) {
416 n = Compile::narrow_value(ft, n, phi_type, &_igvn, true);
417 }
418 values.at_put(j, n);
419 } else if(val->is_Proj() && val->in(0) == alloc) {
420 Node* default_value = alloc->in(AllocateNode::DefaultValue);
421 if (default_value != NULL) {
422 values.at_put(j, default_value);
423 } else {
424 assert(alloc->in(AllocateNode::RawDefaultValue) == NULL, "default value may not be null");
425 values.at_put(j, _igvn.zerocon(ft));
426 }
427 } else if (val->is_Phi()) {
428 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1);
429 if (val == NULL) {
430 return NULL;
431 }
432 values.at_put(j, val);
433 } else if (val->Opcode() == Op_SCMemProj) {
434 assert(val->in(0)->is_LoadStore() ||
435 val->in(0)->Opcode() == Op_EncodeISOArray ||
436 val->in(0)->Opcode() == Op_StrCompressedCopy, "sanity");
437 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
438 return NULL;
439 } else if (val->is_ArrayCopy()) {
440 Node* res = make_arraycopy_load(val->as_ArrayCopy(), offset, val->in(0), val->in(TypeFunc::Memory), ft, phi_type, alloc);
441 if (res == NULL) {
442 return NULL;
443 }
444 values.at_put(j, res);
445 } else {
446 DEBUG_ONLY( val->dump(); )
450 }
451 }
452 // Set Phi's inputs
453 for (uint j = 1; j < length; j++) {
454 if (values.at(j) == mem) {
455 phi->init_req(j, phi);
456 } else {
457 phi->init_req(j, values.at(j));
458 }
459 }
460 return phi;
461 }
462
463 // Search the last value stored into the object's field.
464 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, Node *sfpt_ctl, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, AllocateNode *alloc) {
465 assert(adr_t->is_known_instance_field(), "instance required");
466 int instance_id = adr_t->instance_id();
467 assert((uint)instance_id == alloc->_idx, "wrong allocation");
468
469 int alias_idx = C->get_alias_index(adr_t);
470 int offset = adr_t->flattened_offset();
471 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
472 Node *alloc_mem = alloc->in(TypeFunc::Memory);
473 VectorSet visited;
474
475 bool done = sfpt_mem == alloc_mem;
476 Node *mem = sfpt_mem;
477 while (!done) {
478 if (visited.test_set(mem->_idx)) {
479 return NULL; // found a loop, give up
480 }
481 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn);
482 if (mem == start_mem || mem == alloc_mem) {
483 done = true; // hit a sentinel, return appropriate 0 value
484 } else if (mem->is_Initialize()) {
485 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
486 if (mem == NULL) {
487 done = true; // Something went wrong.
488 } else if (mem->is_Store()) {
489 const TypePtr* atype = mem->as_Store()->adr_type();
490 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice");
491 done = true;
492 }
493 } else if (mem->is_Store()) {
494 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr();
495 assert(atype != NULL, "address type must be oopptr");
496 assert(C->get_alias_index(atype) == alias_idx &&
497 atype->is_known_instance_field() && atype->flattened_offset() == offset &&
498 atype->instance_id() == instance_id, "store is correct memory slice");
499 done = true;
500 } else if (mem->is_Phi()) {
501 // try to find a phi's unique input
502 Node *unique_input = NULL;
503 Node *top = C->top();
504 for (uint i = 1; i < mem->req(); i++) {
505 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn);
506 if (n == NULL || n == top || n == mem) {
507 continue;
508 } else if (unique_input == NULL) {
509 unique_input = n;
510 } else if (unique_input != n) {
511 unique_input = top;
512 break;
513 }
514 }
515 if (unique_input != NULL && unique_input != top) {
516 mem = unique_input;
517 } else {
518 done = true;
519 }
520 } else if (mem->is_ArrayCopy()) {
521 done = true;
522 } else {
523 DEBUG_ONLY( mem->dump(); )
524 assert(false, "unexpected node");
525 }
526 }
527 if (mem != NULL) {
528 if (mem == start_mem || mem == alloc_mem) {
529 // hit a sentinel, return appropriate 0 value
530 Node* default_value = alloc->in(AllocateNode::DefaultValue);
531 if (default_value != NULL) {
532 return default_value;
533 }
534 assert(alloc->in(AllocateNode::RawDefaultValue) == NULL, "default value may not be null");
535 return _igvn.zerocon(ft);
536 } else if (mem->is_Store()) {
537 Node* n = mem->in(MemNode::ValueIn);
538 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
539 n = bs->step_over_gc_barrier(n);
540 return n;
541 } else if (mem->is_Phi()) {
542 // attempt to produce a Phi reflecting the values on the input paths of the Phi
543 Node_Stack value_phis(8);
544 Node* phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit);
545 if (phi != NULL) {
546 return phi;
547 } else {
548 // Kill all new Phis
549 while(value_phis.is_nonempty()) {
550 Node* n = value_phis.node();
551 _igvn.replace_node(n, C->top());
552 value_phis.pop();
553 }
554 }
555 } else if (mem->is_ArrayCopy()) {
556 Node* ctl = mem->in(0);
557 Node* m = mem->in(TypeFunc::Memory);
558 if (sfpt_ctl->is_Proj() && sfpt_ctl->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) {
559 // pin the loads in the uncommon trap path
560 ctl = sfpt_ctl;
561 m = sfpt_mem;
562 }
563 return make_arraycopy_load(mem->as_ArrayCopy(), offset, ctl, m, ft, ftype, alloc);
564 }
565 }
566 // Something went wrong.
567 return NULL;
568 }
569
570 // Search the last value stored into the inline type's fields.
571 Node* PhaseMacroExpand::inline_type_from_mem(Node* mem, Node* ctl, ciInlineKlass* vk, const TypeAryPtr* adr_type, int offset, AllocateNode* alloc) {
572 // Subtract the offset of the first field to account for the missing oop header
573 offset -= vk->first_field_offset();
574 // Create a new InlineTypeNode and retrieve the field values from memory
575 InlineTypeNode* vt = InlineTypeNode::make_uninitialized(_igvn, vk)->as_InlineType();
576 transform_later(vt);
577 for (int i = 0; i < vk->nof_declared_nonstatic_fields(); ++i) {
578 ciType* field_type = vt->field_type(i);
579 int field_offset = offset + vt->field_offset(i);
580 Node* value = NULL;
581 if (vt->field_is_flattened(i)) {
582 value = inline_type_from_mem(mem, ctl, field_type->as_inline_klass(), adr_type, field_offset, alloc);
583 } else {
584 const Type* ft = Type::get_const_type(field_type);
585 BasicType bt = type2field[field_type->basic_type()];
586 if (UseCompressedOops && !is_java_primitive(bt)) {
587 ft = ft->make_narrowoop();
588 bt = T_NARROWOOP;
589 }
590 // Each inline type field has its own memory slice
591 adr_type = adr_type->with_field_offset(field_offset);
592 value = value_from_mem(mem, ctl, bt, ft, adr_type, alloc);
593 if (value != NULL && ft->isa_narrowoop()) {
594 assert(UseCompressedOops, "unexpected narrow oop");
595 if (value->is_EncodeP()) {
596 value = value->in(1);
597 } else {
598 value = transform_later(new DecodeNNode(value, value->get_ptr_type()));
599 }
600 }
601 }
602 if (value != NULL) {
603 vt->set_field_value(i, value);
604 } else {
605 // We might have reached the TrackedInitializationLimit
606 return NULL;
607 }
608 }
609 return vt;
610 }
611
612 // Check the possibility of scalar replacement.
613 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
614 // Scan the uses of the allocation to check for anything that would
615 // prevent us from eliminating it.
616 NOT_PRODUCT( const char* fail_eliminate = NULL; )
617 DEBUG_ONLY( Node* disq_node = NULL; )
618 bool can_eliminate = true;
619
620 Unique_Node_List worklist;
621 Node* res = alloc->result_cast();
622 const TypeOopPtr* res_type = NULL;
623 if (res == NULL) {
624 // All users were eliminated.
625 } else if (!res->is_CheckCastPP()) {
626 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";)
627 can_eliminate = false;
628 } else {
629 worklist.push(res);
630 res_type = _igvn.type(res)->isa_oopptr();
631 if (res_type == NULL) {
632 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";)
633 can_eliminate = false;
634 } else if (res_type->isa_aryptr()) {
635 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1);
636 if (length < 0) {
637 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";)
638 can_eliminate = false;
639 }
640 }
641 }
642
643 while (can_eliminate && worklist.size() > 0) {
644 res = worklist.pop();
645 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); j < jmax && can_eliminate; j++) {
646 Node* use = res->fast_out(j);
647
648 if (use->is_AddP()) {
649 const TypePtr* addp_type = _igvn.type(use)->is_ptr();
650 int offset = addp_type->offset();
651
652 if (offset == Type::OffsetTop || offset == Type::OffsetBot) {
653 NOT_PRODUCT(fail_eliminate = "Undefined field reference";)
654 can_eliminate = false;
655 break;
656 }
657 for (DUIterator_Fast kmax, k = use->fast_outs(kmax);
658 k < kmax && can_eliminate; k++) {
659 Node* n = use->fast_out(k);
660 if (!n->is_Store() && n->Opcode() != Op_CastP2X
661 SHENANDOAHGC_ONLY(&& (!UseShenandoahGC || !ShenandoahBarrierSetC2::is_shenandoah_wb_pre_call(n))) ) {
662 DEBUG_ONLY(disq_node = n;)
663 if (n->is_Load() || n->is_LoadStore()) {
664 NOT_PRODUCT(fail_eliminate = "Field load";)
665 } else {
674 use->as_ArrayCopy()->is_copyof_validated() ||
675 use->as_ArrayCopy()->is_copyofrange_validated()) &&
676 use->in(ArrayCopyNode::Dest) == res) {
677 // ok to eliminate
678 } else if (use->is_SafePoint()) {
679 SafePointNode* sfpt = use->as_SafePoint();
680 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) {
681 // Object is passed as argument.
682 DEBUG_ONLY(disq_node = use;)
683 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";)
684 can_eliminate = false;
685 }
686 Node* sfptMem = sfpt->memory();
687 if (sfptMem == NULL || sfptMem->is_top()) {
688 DEBUG_ONLY(disq_node = use;)
689 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";)
690 can_eliminate = false;
691 } else {
692 safepoints.append_if_missing(sfpt);
693 }
694 } else if (use->is_InlineType() && use->isa_InlineType()->get_oop() == res) {
695 // ok to eliminate
696 } else if (use->is_InlineTypePtr() && use->isa_InlineTypePtr()->get_oop() == res) {
697 // Process users
698 worklist.push(use);
699 } else if (use->Opcode() == Op_StoreX && use->in(MemNode::Address) == res) {
700 // Store to mark word of inline type larval buffer
701 assert(res_type->is_inlinetypeptr(), "Unexpected store to mark word");
702 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark
703 if (use->is_Phi()) {
704 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) {
705 NOT_PRODUCT(fail_eliminate = "Object is return value";)
706 } else {
707 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";)
708 }
709 DEBUG_ONLY(disq_node = use;)
710 } else {
711 if (use->Opcode() == Op_Return) {
712 NOT_PRODUCT(fail_eliminate = "Object is return value";)
713 } else {
714 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";)
715 }
716 DEBUG_ONLY(disq_node = use;)
717 }
718 can_eliminate = false;
719 } else {
720 assert(use->Opcode() == Op_CastP2X, "should be");
721 assert(!use->has_out_with(Op_OrL), "should have been removed because oop is never null");
722 }
723 }
724 }
725
726 #ifndef PRODUCT
727 if (PrintEliminateAllocations) {
728 if (can_eliminate) {
729 tty->print("Scalar ");
730 if (res == NULL)
731 alloc->dump();
732 else
733 res->dump();
734 } else {
735 tty->print("NotScalar (%s)", fail_eliminate);
736 if (res == NULL)
737 alloc->dump();
738 else
739 res->dump();
740 #ifdef ASSERT
741 if (disq_node != NULL) {
742 tty->print(" >>>> ");
743 disq_node->dump();
744 }
745 #endif /*ASSERT*/
746 }
747 }
748 #endif
749 return can_eliminate;
750 }
751
752 // Do scalar replacement.
753 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
754 GrowableArray <SafePointNode *> safepoints_done;
760 BasicType basic_elem_type = T_ILLEGAL;
761 const Type* field_type = NULL;
762
763 Node* res = alloc->result_cast();
764 assert(res == NULL || res->is_CheckCastPP(), "unexpected AllocateNode result");
765 const TypeOopPtr* res_type = NULL;
766 if (res != NULL) { // Could be NULL when there are no users
767 res_type = _igvn.type(res)->isa_oopptr();
768 }
769
770 if (res != NULL) {
771 if (res_type->isa_instptr()) {
772 // find the fields of the class which will be needed for safepoint debug information
773 iklass = res_type->is_instptr()->instance_klass();
774 nfields = iklass->nof_nonstatic_fields();
775 } else {
776 // find the array's elements which will be needed for safepoint debug information
777 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1);
778 assert(nfields >= 0, "must be an array klass.");
779 basic_elem_type = res_type->is_aryptr()->elem()->array_element_basic_type();
780 if (basic_elem_type == T_PRIMITIVE_OBJECT && !res_type->is_aryptr()->is_flat()) {
781 basic_elem_type = T_OBJECT;
782 }
783 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
784 element_size = type2aelembytes(basic_elem_type);
785 field_type = res_type->is_aryptr()->elem();
786 if (res_type->is_aryptr()->is_flat()) {
787 // Flattened inline type array
788 element_size = res_type->is_aryptr()->flat_elem_size();
789 }
790 }
791 }
792 //
793 // Process the safepoint uses
794 //
795 assert(safepoints.length() == 0 || !res_type->is_inlinetypeptr(), "Inline type allocations should not have safepoint uses");
796 Unique_Node_List value_worklist;
797 while (safepoints.length() > 0) {
798 SafePointNode* sfpt = safepoints.pop();
799 Node* mem = sfpt->memory();
800 Node* ctl = sfpt->control();
801 assert(sfpt->jvms() != NULL, "missed JVMS");
802 // Fields of scalar objs are referenced only at the end
803 // of regular debuginfo at the last (youngest) JVMS.
804 // Record relative start index.
805 uint first_ind = (sfpt->req() - sfpt->jvms()->scloff());
806 SafePointScalarObjectNode* sobj = new SafePointScalarObjectNode(res_type,
807 #ifdef ASSERT
808 alloc,
809 #endif
810 first_ind, nfields);
811 sobj->init_req(0, C->root());
812 transform_later(sobj);
813
814 // Scan object's fields adding an input to the safepoint for each field.
815 for (int j = 0; j < nfields; j++) {
816 intptr_t offset;
817 ciField* field = NULL;
818 if (iklass != NULL) {
819 field = iklass->nonstatic_field_at(j);
820 offset = field->offset();
821 ciType* elem_type = field->type();
822 basic_elem_type = field->layout_type();
823 assert(!field->is_flattened(), "flattened inline type fields should not have safepoint uses");
824
825 // The next code is taken from Parse::do_get_xxx().
826 if (is_reference_type(basic_elem_type)) {
827 if (!elem_type->is_loaded()) {
828 field_type = TypeInstPtr::BOTTOM;
829 } else if (field != NULL && field->is_static_constant()) {
830 ciObject* con = field->constant_value().as_object();
831 // Do not "join" in the previous type; it doesn't add value,
832 // and may yield a vacuous result if the field is of interface type.
833 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
834 assert(field_type != NULL, "field singleton type must be consistent");
835 } else {
836 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
837 }
838 if (UseCompressedOops) {
839 field_type = field_type->make_narrowoop();
840 basic_elem_type = T_NARROWOOP;
841 }
842 } else {
843 field_type = Type::get_const_basic_type(basic_elem_type);
844 }
845 } else {
846 offset = array_base + j * (intptr_t)element_size;
847 }
848
849 Node* field_val = NULL;
850 const TypeOopPtr* field_addr_type = res_type->add_offset(offset)->isa_oopptr();
851 if (res_type->isa_aryptr() && res_type->is_aryptr()->is_flat()) {
852 ciInlineKlass* vk = res_type->is_aryptr()->elem()->inline_klass();
853 assert(vk->flatten_array(), "must be flattened");
854 field_val = inline_type_from_mem(mem, ctl, vk, field_addr_type->isa_aryptr(), 0, alloc);
855 } else {
856 field_val = value_from_mem(mem, ctl, basic_elem_type, field_type, field_addr_type, alloc);
857 }
858 if (field_val == NULL) {
859 // We weren't able to find a value for this field,
860 // give up on eliminating this allocation.
861
862 // Remove any extra entries we added to the safepoint.
863 uint last = sfpt->req() - 1;
864 for (int k = 0; k < j; k++) {
865 sfpt->del_req(last--);
866 }
867 _igvn._worklist.push(sfpt);
868 // rollback processed safepoints
869 while (safepoints_done.length() > 0) {
870 SafePointNode* sfpt_done = safepoints_done.pop();
871 // remove any extra entries we added to the safepoint
872 last = sfpt_done->req() - 1;
873 for (int k = 0; k < nfields; k++) {
874 sfpt_done->del_req(last--);
875 }
876 JVMState *jvms = sfpt_done->jvms();
877 jvms->set_endoff(sfpt_done->req());
900 int field_idx = C->get_alias_index(field_addr_type);
901 tty->print(" (alias_idx=%d)", field_idx);
902 } else { // Array's element
903 tty->print("=== At SafePoint node %d can't find value of array element [%d]",
904 sfpt->_idx, j);
905 }
906 tty->print(", which prevents elimination of: ");
907 if (res == NULL)
908 alloc->dump();
909 else
910 res->dump();
911 }
912 #endif
913 return false;
914 }
915 if (UseCompressedOops && field_type->isa_narrowoop()) {
916 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
917 // to be able scalar replace the allocation.
918 if (field_val->is_EncodeP()) {
919 field_val = field_val->in(1);
920 } else if (!field_val->is_InlineTypeBase()) {
921 field_val = transform_later(new DecodeNNode(field_val, field_val->get_ptr_type()));
922 }
923 }
924 if (field_val->is_InlineTypeBase()) {
925 // Keep track of inline types to scalarize them later
926 value_worklist.push(field_val);
927 }
928 sfpt->add_req(field_val);
929 }
930 JVMState *jvms = sfpt->jvms();
931 jvms->set_endoff(sfpt->req());
932 // Now make a pass over the debug information replacing any references
933 // to the allocated object with "sobj"
934 int start = jvms->debug_start();
935 int end = jvms->debug_end();
936 sfpt->replace_edges_in_range(res, sobj, start, end, &_igvn);
937 _igvn._worklist.push(sfpt);
938 safepoints_done.append_if_missing(sfpt); // keep it for rollback
939 }
940 // Scalarize inline types that were added to the safepoint.
941 // Don't allow linking a constant oop (if available) for flat array elements
942 // because Deoptimization::reassign_flat_array_elements needs field values.
943 bool allow_oop = res_type != NULL && (!res_type->isa_aryptr() || !res_type->is_aryptr()->is_flat());
944 for (uint i = 0; i < value_worklist.size(); ++i) {
945 InlineTypeBaseNode* vt = value_worklist.at(i)->as_InlineTypeBase();
946 vt->make_scalar_in_safepoints(&_igvn, allow_oop);
947 }
948 return true;
949 }
950
951 static void disconnect_projections(MultiNode* n, PhaseIterGVN& igvn) {
952 Node* ctl_proj = n->proj_out_or_null(TypeFunc::Control);
953 Node* mem_proj = n->proj_out_or_null(TypeFunc::Memory);
954 if (ctl_proj != NULL) {
955 igvn.replace_node(ctl_proj, n->in(0));
956 }
957 if (mem_proj != NULL) {
958 igvn.replace_node(mem_proj, n->in(TypeFunc::Memory));
959 }
960 }
961
962 // Process users of eliminated allocation.
963 void PhaseMacroExpand::process_users_of_allocation(CallNode *alloc, bool inline_alloc) {
964 Unique_Node_List worklist;
965 Node* res = alloc->result_cast();
966 if (res != NULL) {
967 worklist.push(res);
968 }
969 while (worklist.size() > 0) {
970 res = worklist.pop();
971 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) {
972 Node *use = res->last_out(j);
973 uint oc1 = res->outcnt();
974
975 if (use->is_AddP()) {
976 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) {
977 Node *n = use->last_out(k);
978 uint oc2 = use->outcnt();
979 if (n->is_Store()) {
980 for (DUIterator_Fast pmax, p = n->fast_outs(pmax); p < pmax; p++) {
981 MemBarNode* mb = n->fast_out(p)->isa_MemBar();
982 if (mb != NULL && mb->req() <= MemBarNode::Precedent && mb->in(MemBarNode::Precedent) == n) {
983 // MemBarVolatiles should have been removed by MemBarNode::Ideal() for non-inline allocations
984 assert(inline_alloc, "MemBarVolatile should be eliminated for non-escaping object");
985 mb->remove(&_igvn);
986 }
987 }
988 _igvn.replace_node(n, n->in(MemNode::Memory));
989 } else {
990 eliminate_gc_barrier(n);
991 }
992 k -= (oc2 - use->outcnt());
993 }
994 _igvn.remove_dead_node(use);
995 } else if (use->is_ArrayCopy()) {
996 // Disconnect ArrayCopy node
997 ArrayCopyNode* ac = use->as_ArrayCopy();
998 if (ac->is_clonebasic()) {
999 Node* membar_after = ac->proj_out(TypeFunc::Control)->unique_ctrl_out();
1000 disconnect_projections(ac, _igvn);
1001 assert(alloc->in(TypeFunc::Memory)->is_Proj() && alloc->in(TypeFunc::Memory)->in(0)->Opcode() == Op_MemBarCPUOrder, "mem barrier expected before allocation");
1002 Node* membar_before = alloc->in(TypeFunc::Memory)->in(0);
1003 disconnect_projections(membar_before->as_MemBar(), _igvn);
1004 if (membar_after->is_MemBar()) {
1005 disconnect_projections(membar_after->as_MemBar(), _igvn);
1006 }
1007 } else {
1008 assert(ac->is_arraycopy_validated() ||
1009 ac->is_copyof_validated() ||
1010 ac->is_copyofrange_validated(), "unsupported");
1011 CallProjections* callprojs = ac->extract_projections(true);
1012
1013 _igvn.replace_node(callprojs->fallthrough_ioproj, ac->in(TypeFunc::I_O));
1014 _igvn.replace_node(callprojs->fallthrough_memproj, ac->in(TypeFunc::Memory));
1015 _igvn.replace_node(callprojs->fallthrough_catchproj, ac->in(TypeFunc::Control));
1016
1017 // Set control to top. IGVN will remove the remaining projections
1018 ac->set_req(0, top());
1019 ac->replace_edge(res, top(), &_igvn);
1020
1021 // Disconnect src right away: it can help find new
1022 // opportunities for allocation elimination
1023 Node* src = ac->in(ArrayCopyNode::Src);
1024 ac->replace_edge(src, top(), &_igvn);
1025 // src can be top at this point if src and dest of the
1026 // arraycopy were the same
1027 if (src->outcnt() == 0 && !src->is_top()) {
1028 _igvn.remove_dead_node(src);
1029 }
1030 }
1031 _igvn._worklist.push(ac);
1032 } else if (use->is_InlineType()) {
1033 assert(use->isa_InlineType()->get_oop() == res, "unexpected inline type use");
1034 _igvn.rehash_node_delayed(use);
1035 use->isa_InlineType()->set_oop(_igvn.zerocon(T_PRIMITIVE_OBJECT));
1036 } else if (use->is_InlineTypePtr()) {
1037 assert(use->isa_InlineTypePtr()->get_oop() == res, "unexpected inline type ptr use");
1038 _igvn.rehash_node_delayed(use);
1039 use->isa_InlineTypePtr()->set_oop(_igvn.zerocon(T_PRIMITIVE_OBJECT));
1040 // Process users
1041 worklist.push(use);
1042 } else if (use->Opcode() == Op_StoreX && use->in(MemNode::Address) == res) {
1043 // Store to mark word of inline type larval buffer
1044 assert(inline_alloc, "Unexpected store to mark word");
1045 _igvn.replace_node(use, use->in(MemNode::Memory));
1046 } else {
1047 eliminate_gc_barrier(use);
1048 }
1049 j -= (oc1 - res->outcnt());
1050 }
1051 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted");
1052 _igvn.remove_dead_node(res);
1053 }
1054
1055 //
1056 // Process other users of allocation's projections
1057 //
1058 if (_callprojs->resproj[0] != NULL && _callprojs->resproj[0]->outcnt() != 0) {
1059 // First disconnect stores captured by Initialize node.
1060 // If Initialize node is eliminated first in the following code,
1061 // it will kill such stores and DUIterator_Last will assert.
1062 for (DUIterator_Fast jmax, j = _callprojs->resproj[0]->fast_outs(jmax); j < jmax; j++) {
1063 Node* use = _callprojs->resproj[0]->fast_out(j);
1064 if (use->is_AddP()) {
1065 // raw memory addresses used only by the initialization
1066 _igvn.replace_node(use, C->top());
1067 --j; --jmax;
1068 }
1069 }
1070 for (DUIterator_Last jmin, j = _callprojs->resproj[0]->last_outs(jmin); j >= jmin; ) {
1071 Node* use = _callprojs->resproj[0]->last_out(j);
1072 uint oc1 = _callprojs->resproj[0]->outcnt();
1073 if (use->is_Initialize()) {
1074 // Eliminate Initialize node.
1075 InitializeNode *init = use->as_Initialize();
1076 assert(init->outcnt() <= 2, "only a control and memory projection expected");
1077 Node *ctrl_proj = init->proj_out_or_null(TypeFunc::Control);
1078 if (ctrl_proj != NULL) {
1079 _igvn.replace_node(ctrl_proj, init->in(TypeFunc::Control));
1080 #ifdef ASSERT
1081 // If the InitializeNode has no memory out, it will die, and tmp will become NULL
1082 Node* tmp = init->in(TypeFunc::Control);
1083 assert(tmp == NULL || tmp == _callprojs->fallthrough_catchproj, "allocation control projection");
1084 #endif
1085 }
1086 Node *mem_proj = init->proj_out_or_null(TypeFunc::Memory);
1087 if (mem_proj != NULL) {
1088 Node *mem = init->in(TypeFunc::Memory);
1089 #ifdef ASSERT
1090 if (mem->is_MergeMem()) {
1091 assert(mem->in(TypeFunc::Memory) == _callprojs->fallthrough_memproj, "allocation memory projection");
1092 } else {
1093 assert(mem == _callprojs->fallthrough_memproj, "allocation memory projection");
1094 }
1095 #endif
1096 _igvn.replace_node(mem_proj, mem);
1097 }
1098 } else if (use->Opcode() == Op_MemBarStoreStore) {
1099 // Inline type buffer allocations are followed by a membar
1100 assert(inline_alloc, "Unexpected MemBarStoreStore");
1101 use->as_MemBar()->remove(&_igvn);
1102 } else {
1103 assert(false, "only Initialize or AddP expected");
1104 }
1105 j -= (oc1 - _callprojs->resproj[0]->outcnt());
1106 }
1107 }
1108 if (_callprojs->fallthrough_catchproj != NULL) {
1109 _igvn.replace_node(_callprojs->fallthrough_catchproj, alloc->in(TypeFunc::Control));
1110 }
1111 if (_callprojs->fallthrough_memproj != NULL) {
1112 _igvn.replace_node(_callprojs->fallthrough_memproj, alloc->in(TypeFunc::Memory));
1113 }
1114 if (_callprojs->catchall_memproj != NULL) {
1115 _igvn.replace_node(_callprojs->catchall_memproj, C->top());
1116 }
1117 if (_callprojs->fallthrough_ioproj != NULL) {
1118 _igvn.replace_node(_callprojs->fallthrough_ioproj, alloc->in(TypeFunc::I_O));
1119 }
1120 if (_callprojs->catchall_ioproj != NULL) {
1121 _igvn.replace_node(_callprojs->catchall_ioproj, C->top());
1122 }
1123 if (_callprojs->catchall_catchproj != NULL) {
1124 _igvn.replace_node(_callprojs->catchall_catchproj, C->top());
1125 }
1126 }
1127
1128 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) {
1129 // If reallocation fails during deoptimization we'll pop all
1130 // interpreter frames for this compiled frame and that won't play
1131 // nice with JVMTI popframe.
1132 // We avoid this issue by eager reallocation when the popframe request
1133 // is received.
1134 if (!EliminateAllocations) {
1135 return false;
1136 }
1137 Node* klass = alloc->in(AllocateNode::KlassNode);
1138 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr();
1139
1140 // Attempt to eliminate inline type buffer allocations
1141 // regardless of usage and escape/replaceable status.
1142 bool inline_alloc = tklass->isa_instklassptr() &&
1143 tklass->is_instklassptr()->instance_klass()->is_inlinetype();
1144 if (!alloc->_is_non_escaping && !inline_alloc) {
1145 return false;
1146 }
1147 // Eliminate boxing allocations which are not used
1148 // regardless scalar replaceable status.
1149 Node* res = alloc->result_cast();
1150 bool boxing_alloc = (res == NULL) && C->eliminate_boxing() &&
1151 tklass->isa_instklassptr() &&
1152 tklass->is_instklassptr()->instance_klass()->is_box_klass();
1153 if (!alloc->_is_scalar_replaceable && (!boxing_alloc || (res != NULL))) {
1154 return false;
1155 }
1156
1157 _callprojs = alloc->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1158
1159 GrowableArray <SafePointNode *> safepoints;
1160 if (!can_eliminate_allocation(alloc, safepoints)) {
1161 return false;
1162 }
1163
1164 if (!alloc->_is_scalar_replaceable) {
1165 assert(res == NULL || inline_alloc, "sanity");
1166 // We can only eliminate allocation if all debug info references
1167 // are already replaced with SafePointScalarObject because
1168 // we can't search for a fields value without instance_id.
1169 if (safepoints.length() > 0) {
1170 assert(!inline_alloc, "Inline type allocations should not have safepoint uses");
1171 return false;
1172 }
1173 }
1174
1175 if (!scalar_replacement(alloc, safepoints)) {
1176 return false;
1177 }
1178
1179 CompileLog* log = C->log();
1180 if (log != NULL) {
1181 log->head("eliminate_allocation type='%d'",
1182 log->identify(tklass->exact_klass()));
1183 JVMState* p = alloc->jvms();
1184 while (p != NULL) {
1185 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1186 p = p->caller();
1187 }
1188 log->tail("eliminate_allocation");
1189 }
1190
1191 process_users_of_allocation(alloc, inline_alloc);
1192
1193 #ifndef PRODUCT
1194 if (PrintEliminateAllocations) {
1195 if (alloc->is_AllocateArray())
1196 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1197 else
1198 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1199 }
1200 #endif
1201
1202 return true;
1203 }
1204
1205 bool PhaseMacroExpand::eliminate_boxing_node(CallStaticJavaNode *boxing) {
1206 // EA should remove all uses of non-escaping boxing node.
1207 if (!C->eliminate_boxing() || boxing->proj_out_or_null(TypeFunc::Parms) != NULL) {
1208 return false;
1209 }
1210
1211 assert(boxing->result_cast() == NULL, "unexpected boxing node result");
1212
1213 _callprojs = boxing->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1214
1215 const TypeTuple* r = boxing->tf()->range_sig();
1216 assert(r->cnt() > TypeFunc::Parms, "sanity");
1217 const TypeInstPtr* t = r->field_at(TypeFunc::Parms)->isa_instptr();
1218 assert(t != NULL, "sanity");
1219
1220 CompileLog* log = C->log();
1221 if (log != NULL) {
1222 log->head("eliminate_boxing type='%d'",
1223 log->identify(t->instance_klass()));
1224 JVMState* p = boxing->jvms();
1225 while (p != NULL) {
1226 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1227 p = p->caller();
1228 }
1229 log->tail("eliminate_boxing");
1230 }
1231
1232 process_users_of_allocation(boxing);
1233
1234 #ifndef PRODUCT
1235 if (PrintEliminateAllocations) {
1378 }
1379 }
1380 #endif
1381 yank_alloc_node(alloc);
1382 return;
1383 }
1384 }
1385
1386 enum { too_big_or_final_path = 1, need_gc_path = 2 };
1387 Node *slow_region = NULL;
1388 Node *toobig_false = ctrl;
1389
1390 // generate the initial test if necessary
1391 if (initial_slow_test != NULL ) {
1392 assert (expand_fast_path, "Only need test if there is a fast path");
1393 slow_region = new RegionNode(3);
1394
1395 // Now make the initial failure test. Usually a too-big test but
1396 // might be a TRUE for finalizers or a fancy class check for
1397 // newInstance0.
1398 IfNode* toobig_iff = new IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN);
1399 transform_later(toobig_iff);
1400 // Plug the failing-too-big test into the slow-path region
1401 Node* toobig_true = new IfTrueNode(toobig_iff);
1402 transform_later(toobig_true);
1403 slow_region ->init_req( too_big_or_final_path, toobig_true );
1404 toobig_false = new IfFalseNode(toobig_iff);
1405 transform_later(toobig_false);
1406 } else {
1407 // No initial test, just fall into next case
1408 assert(allocation_has_use || !expand_fast_path, "Should already have been handled");
1409 toobig_false = ctrl;
1410 debug_only(slow_region = NodeSentinel);
1411 }
1412
1413 // If we are here there are several possibilities
1414 // - expand_fast_path is false - then only a slow path is expanded. That's it.
1415 // no_initial_check means a constant allocation.
1416 // - If check always evaluates to false -> expand_fast_path is false (see above)
1417 // - If check always evaluates to true -> directly into fast path (but may bailout to slowpath)
1418 // if !allocation_has_use the fast path is empty
1419 // if !allocation_has_use && no_initial_check
1420 // - Then there are no fastpath that can fall out to slowpath -> no allocation code at all.
1421 // removed by yank_alloc_node above.
1422
1423 Node *slow_mem = mem; // save the current memory state for slow path
1424 // generate the fast allocation code unless we know that the initial test will always go slow
1425 if (expand_fast_path) {
1426 // Fast path modifies only raw memory.
1427 if (mem->is_MergeMem()) {
1428 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
1429 }
1430
1431 // allocate the Region and Phi nodes for the result
1432 result_region = new RegionNode(3);
1433 result_phi_rawmem = new PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM);
1434 result_phi_i_o = new PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch
1435
1436 // Grab regular I/O before optional prefetch may change it.
1437 // Slow-path does no I/O so just set it to the original I/O.
1438 result_phi_i_o->init_req(slow_result_path, i_o);
1439
1440 // Name successful fast-path variables
1441 Node* fast_oop_ctrl;
1442 Node* fast_oop_rawmem;
1443
1444 if (allocation_has_use) {
1445 Node* needgc_ctrl = NULL;
1446 result_phi_rawoop = new PhiNode(result_region, TypeRawPtr::BOTTOM);
1447
1448 intx prefetch_lines = length != NULL ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
1449 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1450 Node* fast_oop = bs->obj_allocate(this, mem, toobig_false, size_in_bytes, i_o, needgc_ctrl,
1451 fast_oop_ctrl, fast_oop_rawmem,
1452 prefetch_lines);
1453
1454 if (initial_slow_test != NULL) {
1455 // This completes all paths into the slow merge point
1456 slow_region->init_req(need_gc_path, needgc_ctrl);
1457 transform_later(slow_region);
1458 } else {
1459 // No initial slow path needed!
1460 // Just fall from the need-GC path straight into the VM call.
1461 slow_region = needgc_ctrl;
1462 }
1463
1481 result_phi_i_o ->init_req(fast_result_path, i_o);
1482 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem);
1483 } else {
1484 slow_region = ctrl;
1485 result_phi_i_o = i_o; // Rename it to use in the following code.
1486 }
1487
1488 // Generate slow-path call
1489 CallNode *call = new CallStaticJavaNode(slow_call_type, slow_call_address,
1490 OptoRuntime::stub_name(slow_call_address),
1491 TypePtr::BOTTOM);
1492 call->init_req(TypeFunc::Control, slow_region);
1493 call->init_req(TypeFunc::I_O, top()); // does no i/o
1494 call->init_req(TypeFunc::Memory, slow_mem); // may gc ptrs
1495 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1496 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1497
1498 call->init_req(TypeFunc::Parms+0, klass_node);
1499 if (length != NULL) {
1500 call->init_req(TypeFunc::Parms+1, length);
1501 } else {
1502 // Let the runtime know if this is a larval allocation
1503 call->init_req(TypeFunc::Parms+1, _igvn.intcon(alloc->_larval));
1504 }
1505
1506 // Copy debug information and adjust JVMState information, then replace
1507 // allocate node with the call
1508 call->copy_call_debug_info(&_igvn, alloc);
1509 if (expand_fast_path) {
1510 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
1511 } else {
1512 // Hook i_o projection to avoid its elimination during allocation
1513 // replacement (when only a slow call is generated).
1514 call->set_req(TypeFunc::I_O, result_phi_i_o);
1515 }
1516 _igvn.replace_node(alloc, call);
1517 transform_later(call);
1518
1519 // Identify the output projections from the allocate node and
1520 // adjust any references to them.
1521 // The control and io projections look like:
1522 //
1523 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl)
1524 // Allocate Catch
1525 // ^---Proj(io) <-------+ ^---CatchProj(io)
1526 //
1527 // We are interested in the CatchProj nodes.
1528 //
1529 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1530
1531 // An allocate node has separate memory projections for the uses on
1532 // the control and i_o paths. Replace the control memory projection with
1533 // result_phi_rawmem (unless we are only generating a slow call when
1534 // both memory projections are combined)
1535 if (expand_fast_path && _callprojs->fallthrough_memproj != NULL) {
1536 _igvn.replace_in_uses(_callprojs->fallthrough_memproj, result_phi_rawmem);
1537 }
1538 // Now change uses of catchall_memproj to use fallthrough_memproj and delete
1539 // catchall_memproj so we end up with a call that has only 1 memory projection.
1540 if (_callprojs->catchall_memproj != NULL) {
1541 if (_callprojs->fallthrough_memproj == NULL) {
1542 _callprojs->fallthrough_memproj = new ProjNode(call, TypeFunc::Memory);
1543 transform_later(_callprojs->fallthrough_memproj);
1544 }
1545 _igvn.replace_in_uses(_callprojs->catchall_memproj, _callprojs->fallthrough_memproj);
1546 _igvn.remove_dead_node(_callprojs->catchall_memproj);
1547 }
1548
1549 // An allocate node has separate i_o projections for the uses on the control
1550 // and i_o paths. Always replace the control i_o projection with result i_o
1551 // otherwise incoming i_o become dead when only a slow call is generated
1552 // (it is different from memory projections where both projections are
1553 // combined in such case).
1554 if (_callprojs->fallthrough_ioproj != NULL) {
1555 _igvn.replace_in_uses(_callprojs->fallthrough_ioproj, result_phi_i_o);
1556 }
1557 // Now change uses of catchall_ioproj to use fallthrough_ioproj and delete
1558 // catchall_ioproj so we end up with a call that has only 1 i_o projection.
1559 if (_callprojs->catchall_ioproj != NULL) {
1560 if (_callprojs->fallthrough_ioproj == NULL) {
1561 _callprojs->fallthrough_ioproj = new ProjNode(call, TypeFunc::I_O);
1562 transform_later(_callprojs->fallthrough_ioproj);
1563 }
1564 _igvn.replace_in_uses(_callprojs->catchall_ioproj, _callprojs->fallthrough_ioproj);
1565 _igvn.remove_dead_node(_callprojs->catchall_ioproj);
1566 }
1567
1568 // if we generated only a slow call, we are done
1569 if (!expand_fast_path) {
1570 // Now we can unhook i_o.
1571 if (result_phi_i_o->outcnt() > 1) {
1572 call->set_req(TypeFunc::I_O, top());
1573 } else {
1574 assert(result_phi_i_o->unique_ctrl_out() == call, "sanity");
1575 // Case of new array with negative size known during compilation.
1576 // AllocateArrayNode::Ideal() optimization disconnect unreachable
1577 // following code since call to runtime will throw exception.
1578 // As result there will be no users of i_o after the call.
1579 // Leave i_o attached to this call to avoid problems in preceding graph.
1580 }
1581 return;
1582 }
1583
1584 if (_callprojs->fallthrough_catchproj != NULL) {
1585 ctrl = _callprojs->fallthrough_catchproj->clone();
1586 transform_later(ctrl);
1587 _igvn.replace_node(_callprojs->fallthrough_catchproj, result_region);
1588 } else {
1589 ctrl = top();
1590 }
1591 Node *slow_result;
1592 if (_callprojs->resproj[0] == NULL) {
1593 // no uses of the allocation result
1594 slow_result = top();
1595 } else {
1596 slow_result = _callprojs->resproj[0]->clone();
1597 transform_later(slow_result);
1598 _igvn.replace_node(_callprojs->resproj[0], result_phi_rawoop);
1599 }
1600
1601 // Plug slow-path into result merge point
1602 result_region->init_req( slow_result_path, ctrl);
1603 transform_later(result_region);
1604 if (allocation_has_use) {
1605 result_phi_rawoop->init_req(slow_result_path, slow_result);
1606 transform_later(result_phi_rawoop);
1607 }
1608 result_phi_rawmem->init_req(slow_result_path, _callprojs->fallthrough_memproj);
1609 transform_later(result_phi_rawmem);
1610 transform_later(result_phi_i_o);
1611 // This completes all paths into the result merge point
1612 }
1613
1614 // Remove alloc node that has no uses.
1615 void PhaseMacroExpand::yank_alloc_node(AllocateNode* alloc) {
1616 Node* ctrl = alloc->in(TypeFunc::Control);
1617 Node* mem = alloc->in(TypeFunc::Memory);
1618 Node* i_o = alloc->in(TypeFunc::I_O);
1619
1620 _callprojs = alloc->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1621 if (_callprojs->resproj[0] != NULL) {
1622 for (DUIterator_Fast imax, i = _callprojs->resproj[0]->fast_outs(imax); i < imax; i++) {
1623 Node* use = _callprojs->resproj[0]->fast_out(i);
1624 use->isa_MemBar()->remove(&_igvn);
1625 --imax;
1626 --i; // back up iterator
1627 }
1628 assert(_callprojs->resproj[0]->outcnt() == 0, "all uses must be deleted");
1629 _igvn.remove_dead_node(_callprojs->resproj[0]);
1630 }
1631 if (_callprojs->fallthrough_catchproj != NULL) {
1632 _igvn.replace_in_uses(_callprojs->fallthrough_catchproj, ctrl);
1633 _igvn.remove_dead_node(_callprojs->fallthrough_catchproj);
1634 }
1635 if (_callprojs->catchall_catchproj != NULL) {
1636 _igvn.rehash_node_delayed(_callprojs->catchall_catchproj);
1637 _callprojs->catchall_catchproj->set_req(0, top());
1638 }
1639 if (_callprojs->fallthrough_proj != NULL) {
1640 Node* catchnode = _callprojs->fallthrough_proj->unique_ctrl_out();
1641 _igvn.remove_dead_node(catchnode);
1642 _igvn.remove_dead_node(_callprojs->fallthrough_proj);
1643 }
1644 if (_callprojs->fallthrough_memproj != NULL) {
1645 _igvn.replace_in_uses(_callprojs->fallthrough_memproj, mem);
1646 _igvn.remove_dead_node(_callprojs->fallthrough_memproj);
1647 }
1648 if (_callprojs->fallthrough_ioproj != NULL) {
1649 _igvn.replace_in_uses(_callprojs->fallthrough_ioproj, i_o);
1650 _igvn.remove_dead_node(_callprojs->fallthrough_ioproj);
1651 }
1652 if (_callprojs->catchall_memproj != NULL) {
1653 _igvn.rehash_node_delayed(_callprojs->catchall_memproj);
1654 _callprojs->catchall_memproj->set_req(0, top());
1655 }
1656 if (_callprojs->catchall_ioproj != NULL) {
1657 _igvn.rehash_node_delayed(_callprojs->catchall_ioproj);
1658 _callprojs->catchall_ioproj->set_req(0, top());
1659 }
1660 #ifndef PRODUCT
1661 if (PrintEliminateAllocations) {
1662 if (alloc->is_AllocateArray()) {
1663 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1664 } else {
1665 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1666 }
1667 }
1668 #endif
1669 _igvn.remove_dead_node(alloc);
1670 }
1671
1672 void PhaseMacroExpand::expand_initialize_membar(AllocateNode* alloc, InitializeNode* init,
1673 Node*& fast_oop_ctrl, Node*& fast_oop_rawmem) {
1674 // If initialization is performed by an array copy, any required
1675 // MemBarStoreStore was already added. If the object does not
1676 // escape no need for a MemBarStoreStore. If the object does not
1677 // escape in its initializer and memory barrier (MemBarStoreStore or
1678 // stronger) is already added at exit of initializer, also no need
1756 Node* thread = new ThreadLocalNode();
1757 transform_later(thread);
1758
1759 call->init_req(TypeFunc::Parms + 0, thread);
1760 call->init_req(TypeFunc::Parms + 1, oop);
1761 call->init_req(TypeFunc::Control, ctrl);
1762 call->init_req(TypeFunc::I_O , top()); // does no i/o
1763 call->init_req(TypeFunc::Memory , rawmem);
1764 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1765 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1766 transform_later(call);
1767 ctrl = new ProjNode(call, TypeFunc::Control);
1768 transform_later(ctrl);
1769 rawmem = new ProjNode(call, TypeFunc::Memory);
1770 transform_later(rawmem);
1771 }
1772 }
1773
1774 // Helper for PhaseMacroExpand::expand_allocate_common.
1775 // Initializes the newly-allocated storage.
1776 Node* PhaseMacroExpand::initialize_object(AllocateNode* alloc,
1777 Node* control, Node* rawmem, Node* object,
1778 Node* klass_node, Node* length,
1779 Node* size_in_bytes) {
1780 InitializeNode* init = alloc->initialization();
1781 // Store the klass & mark bits
1782 Node* mark_node = alloc->make_ideal_mark(&_igvn, control, rawmem);
1783 if (!mark_node->is_Con()) {
1784 transform_later(mark_node);
1785 }
1786 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, TypeX_X->basic_type());
1787
1788 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
1789 int header_size = alloc->minimum_header_size(); // conservatively small
1790
1791 // Array length
1792 if (length != NULL) { // Arrays need length field
1793 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
1794 // conservatively small header size:
1795 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1796 if (_igvn.type(klass_node)->isa_aryklassptr()) { // we know the exact header size in most cases:
1797 BasicType elem = _igvn.type(klass_node)->is_klassptr()->as_instance_type()->isa_aryptr()->elem()->array_element_basic_type();
1798 if (is_reference_type(elem, true)) {
1799 elem = T_OBJECT;
1800 }
1801 header_size = Klass::layout_helper_header_size(Klass::array_layout_helper(elem));
1802 }
1803 }
1804
1805 // Clear the object body, if necessary.
1806 if (init == NULL) {
1807 // The init has somehow disappeared; be cautious and clear everything.
1808 //
1809 // This can happen if a node is allocated but an uncommon trap occurs
1810 // immediately. In this case, the Initialize gets associated with the
1811 // trap, and may be placed in a different (outer) loop, if the Allocate
1812 // is in a loop. If (this is rare) the inner loop gets unrolled, then
1813 // there can be two Allocates to one Initialize. The answer in all these
1814 // edge cases is safety first. It is always safe to clear immediately
1815 // within an Allocate, and then (maybe or maybe not) clear some more later.
1816 if (!(UseTLAB && ZeroTLAB)) {
1817 rawmem = ClearArrayNode::clear_memory(control, rawmem, object,
1818 alloc->in(AllocateNode::DefaultValue),
1819 alloc->in(AllocateNode::RawDefaultValue),
1820 header_size, size_in_bytes,
1821 &_igvn);
1822 }
1823 } else {
1824 if (!init->is_complete()) {
1825 // Try to win by zeroing only what the init does not store.
1826 // We can also try to do some peephole optimizations,
1827 // such as combining some adjacent subword stores.
1828 rawmem = init->complete_stores(control, rawmem, object,
1829 header_size, size_in_bytes, &_igvn);
1830 }
1831 // We have no more use for this link, since the AllocateNode goes away:
1832 init->set_req(InitializeNode::RawAddress, top());
1833 // (If we keep the link, it just confuses the register allocator,
1834 // who thinks he sees a real use of the address by the membar.)
1835 }
1836
1837 return rawmem;
1838 }
1839
2168 } // EliminateNestedLocks
2169
2170 if (alock->is_non_esc_obj()) { // Lock is used for non escaping object
2171 // Look for all locks of this object and mark them and
2172 // corresponding BoxLock nodes as eliminated.
2173 Node* obj = alock->obj_node();
2174 for (uint j = 0; j < obj->outcnt(); j++) {
2175 Node* o = obj->raw_out(j);
2176 if (o->is_AbstractLock() &&
2177 o->as_AbstractLock()->obj_node()->eqv_uncast(obj)) {
2178 alock = o->as_AbstractLock();
2179 Node* box = alock->box_node();
2180 // Replace old box node with new eliminated box for all users
2181 // of the same object and mark related locks as eliminated.
2182 mark_eliminated_box(box, obj);
2183 }
2184 }
2185 }
2186 }
2187
2188 void PhaseMacroExpand::inline_type_guard(Node** ctrl, LockNode* lock) {
2189 Node* obj = lock->obj_node();
2190 const TypePtr* obj_type = _igvn.type(obj)->make_ptr();
2191 if (!obj_type->can_be_inline_type()) {
2192 return;
2193 }
2194 Node* mark = make_load(*ctrl, lock->memory(), obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type());
2195 Node* value_mask = _igvn.MakeConX(markWord::inline_type_pattern);
2196 Node* is_value = _igvn.transform(new AndXNode(mark, value_mask));
2197 Node* cmp = _igvn.transform(new CmpXNode(is_value, value_mask));
2198 Node* bol = _igvn.transform(new BoolNode(cmp, BoolTest::eq));
2199 Node* unc_ctrl = generate_slow_guard(ctrl, bol, NULL);
2200
2201 int trap_request = Deoptimization::make_trap_request(Deoptimization::Reason_class_check, Deoptimization::Action_none);
2202 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point();
2203 const TypePtr* no_memory_effects = NULL;
2204 CallNode* unc = new CallStaticJavaNode(OptoRuntime::uncommon_trap_Type(), call_addr, "uncommon_trap",
2205 no_memory_effects);
2206 unc->init_req(TypeFunc::Control, unc_ctrl);
2207 unc->init_req(TypeFunc::I_O, lock->i_o());
2208 unc->init_req(TypeFunc::Memory, lock->memory());
2209 unc->init_req(TypeFunc::FramePtr, lock->in(TypeFunc::FramePtr));
2210 unc->init_req(TypeFunc::ReturnAdr, lock->in(TypeFunc::ReturnAdr));
2211 unc->init_req(TypeFunc::Parms+0, _igvn.intcon(trap_request));
2212 unc->set_cnt(PROB_UNLIKELY_MAG(4));
2213 unc->copy_call_debug_info(&_igvn, lock);
2214
2215 assert(unc->peek_monitor_box() == lock->box_node(), "wrong monitor");
2216 assert((obj_type->is_inlinetypeptr() && unc->peek_monitor_obj()->is_SafePointScalarObject()) ||
2217 (obj->is_InlineTypePtr() && obj->in(1) == unc->peek_monitor_obj()) ||
2218 (obj == unc->peek_monitor_obj()), "wrong monitor");
2219
2220 // pop monitor and push obj back on stack: we trap before the monitorenter
2221 unc->pop_monitor();
2222 unc->grow_stack(unc->jvms(), 1);
2223 unc->set_stack(unc->jvms(), unc->jvms()->stk_size()-1, obj);
2224 _igvn.register_new_node_with_optimizer(unc);
2225
2226 unc_ctrl = _igvn.transform(new ProjNode(unc, TypeFunc::Control));
2227 Node* halt = _igvn.transform(new HaltNode(unc_ctrl, lock->in(TypeFunc::FramePtr), "monitor enter on inline type"));
2228 _igvn.add_input_to(C->root(), halt);
2229 }
2230
2231 // we have determined that this lock/unlock can be eliminated, we simply
2232 // eliminate the node without expanding it.
2233 //
2234 // Note: The membar's associated with the lock/unlock are currently not
2235 // eliminated. This should be investigated as a future enhancement.
2236 //
2237 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) {
2238
2239 if (!alock->is_eliminated()) {
2240 return false;
2241 }
2242 #ifdef ASSERT
2243 if (!alock->is_coarsened()) {
2244 // Check that new "eliminated" BoxLock node is created.
2245 BoxLockNode* oldbox = alock->box_node()->as_BoxLock();
2246 assert(oldbox->is_eliminated(), "should be done already");
2247 }
2248 #endif
2249
2250 alock->log_lock_optimization(C, "eliminate_lock");
2251
2252 #ifndef PRODUCT
2253 if (PrintEliminateLocks) {
2254 tty->print_cr("++++ Eliminated: %d %s '%s'", alock->_idx, (alock->is_Lock() ? "Lock" : "Unlock"), alock->kind_as_string());
2255 }
2256 #endif
2257
2258 Node* mem = alock->in(TypeFunc::Memory);
2259 Node* ctrl = alock->in(TypeFunc::Control);
2260 guarantee(ctrl != NULL, "missing control projection, cannot replace_node() with NULL");
2261
2262 _callprojs = alock->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2263 // There are 2 projections from the lock. The lock node will
2264 // be deleted when its last use is subsumed below.
2265 assert(alock->outcnt() == 2 &&
2266 _callprojs->fallthrough_proj != NULL &&
2267 _callprojs->fallthrough_memproj != NULL,
2268 "Unexpected projections from Lock/Unlock");
2269
2270 Node* fallthroughproj = _callprojs->fallthrough_proj;
2271 Node* memproj_fallthrough = _callprojs->fallthrough_memproj;
2272
2273 // The memory projection from a lock/unlock is RawMem
2274 // The input to a Lock is merged memory, so extract its RawMem input
2275 // (unless the MergeMem has been optimized away.)
2276 if (alock->is_Lock()) {
2277 // Deoptimize and re-execute if object is an inline type
2278 inline_type_guard(&ctrl, alock->as_Lock());
2279
2280 // Search for MemBarAcquireLock node and delete it also.
2281 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar();
2282 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquireLock, "");
2283 Node* ctrlproj = membar->proj_out(TypeFunc::Control);
2284 Node* memproj = membar->proj_out(TypeFunc::Memory);
2285 _igvn.replace_node(ctrlproj, fallthroughproj);
2286 _igvn.replace_node(memproj, memproj_fallthrough);
2287
2288 // Delete FastLock node also if this Lock node is unique user
2289 // (a loop peeling may clone a Lock node).
2290 Node* flock = alock->as_Lock()->fastlock_node();
2291 if (flock->outcnt() == 1) {
2292 assert(flock->unique_out() == alock, "sanity");
2293 _igvn.replace_node(flock, top());
2294 }
2295 }
2296
2297 // Search for MemBarReleaseLock node and delete it also.
2298 if (alock->is_Unlock() && ctrl->is_Proj() && ctrl->in(0)->is_MemBar()) {
2299 MemBarNode* membar = ctrl->in(0)->as_MemBar();
2320 Node* mem = lock->in(TypeFunc::Memory);
2321 Node* obj = lock->obj_node();
2322 Node* box = lock->box_node();
2323 Node* flock = lock->fastlock_node();
2324
2325 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2326
2327 // Make the merge point
2328 Node *region;
2329 Node *mem_phi;
2330 Node *slow_path;
2331
2332 region = new RegionNode(3);
2333 // create a Phi for the memory state
2334 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2335
2336 // Optimize test; set region slot 2
2337 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0);
2338 mem_phi->init_req(2, mem);
2339
2340 // Deoptimize and re-execute if object is an inline type
2341 inline_type_guard(&slow_path, lock);
2342
2343 // Make slow path call
2344 CallNode *call = make_slow_call((CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(),
2345 OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path,
2346 obj, box, NULL);
2347
2348 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2349
2350 // Slow path can only throw asynchronous exceptions, which are always
2351 // de-opted. So the compiler thinks the slow-call can never throw an
2352 // exception. If it DOES throw an exception we would need the debug
2353 // info removed first (since if it throws there is no monitor).
2354 assert(_callprojs->fallthrough_ioproj == NULL && _callprojs->catchall_ioproj == NULL &&
2355 _callprojs->catchall_memproj == NULL && _callprojs->catchall_catchproj == NULL, "Unexpected projection from Lock");
2356
2357 // Capture slow path
2358 // disconnect fall-through projection from call and create a new one
2359 // hook up users of fall-through projection to region
2360 Node *slow_ctrl = _callprojs->fallthrough_proj->clone();
2361 transform_later(slow_ctrl);
2362 _igvn.hash_delete(_callprojs->fallthrough_proj);
2363 _callprojs->fallthrough_proj->disconnect_inputs(C);
2364 region->init_req(1, slow_ctrl);
2365 // region inputs are now complete
2366 transform_later(region);
2367 _igvn.replace_node(_callprojs->fallthrough_proj, region);
2368
2369 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2370
2371 mem_phi->init_req(1, memproj);
2372
2373 transform_later(mem_phi);
2374
2375 _igvn.replace_node(_callprojs->fallthrough_memproj, mem_phi);
2376 }
2377
2378 //------------------------------expand_unlock_node----------------------
2379 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {
2380
2381 Node* ctrl = unlock->in(TypeFunc::Control);
2382 Node* mem = unlock->in(TypeFunc::Memory);
2383 Node* obj = unlock->obj_node();
2384 Node* box = unlock->box_node();
2385
2386 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2387
2388 // No need for a null check on unlock
2389
2390 // Make the merge point
2391 Node *region;
2392 Node *mem_phi;
2393
2394 region = new RegionNode(3);
2395 // create a Phi for the memory state
2396 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2397
2398 FastUnlockNode *funlock = new FastUnlockNode( ctrl, obj, box );
2399 funlock = transform_later( funlock )->as_FastUnlock();
2400 // Optimize test; set region slot 2
2401 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0);
2402 Node *thread = transform_later(new ThreadLocalNode());
2403
2404 CallNode *call = make_slow_call((CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(),
2405 CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C),
2406 "complete_monitor_unlocking_C", slow_path, obj, box, thread);
2407
2408 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2409 assert(_callprojs->fallthrough_ioproj == NULL && _callprojs->catchall_ioproj == NULL &&
2410 _callprojs->catchall_memproj == NULL && _callprojs->catchall_catchproj == NULL, "Unexpected projection from Lock");
2411
2412 // No exceptions for unlocking
2413 // Capture slow path
2414 // disconnect fall-through projection from call and create a new one
2415 // hook up users of fall-through projection to region
2416 Node *slow_ctrl = _callprojs->fallthrough_proj->clone();
2417 transform_later(slow_ctrl);
2418 _igvn.hash_delete(_callprojs->fallthrough_proj);
2419 _callprojs->fallthrough_proj->disconnect_inputs(C);
2420 region->init_req(1, slow_ctrl);
2421 // region inputs are now complete
2422 transform_later(region);
2423 _igvn.replace_node(_callprojs->fallthrough_proj, region);
2424
2425 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory) );
2426 mem_phi->init_req(1, memproj );
2427 mem_phi->init_req(2, mem);
2428 transform_later(mem_phi);
2429
2430 _igvn.replace_node(_callprojs->fallthrough_memproj, mem_phi);
2431 }
2432
2433 // An inline type might be returned from the call but we don't know its
2434 // type. Either we get a buffered inline type (and nothing needs to be done)
2435 // or one of the inlines being returned is the klass of the inline type
2436 // and we need to allocate an inline type instance of that type and
2437 // initialize it with other values being returned. In that case, we
2438 // first try a fast path allocation and initialize the value with the
2439 // inline klass's pack handler or we fall back to a runtime call.
2440 void PhaseMacroExpand::expand_mh_intrinsic_return(CallStaticJavaNode* call) {
2441 assert(call->method()->is_method_handle_intrinsic(), "must be a method handle intrinsic call");
2442 Node* ret = call->proj_out_or_null(TypeFunc::Parms);
2443 if (ret == NULL) {
2444 return;
2445 }
2446 const TypeFunc* tf = call->_tf;
2447 const TypeTuple* domain = OptoRuntime::store_inline_type_fields_Type()->domain_cc();
2448 const TypeFunc* new_tf = TypeFunc::make(tf->domain_sig(), tf->domain_cc(), tf->range_sig(), domain);
2449 call->_tf = new_tf;
2450 // Make sure the change of type is applied before projections are processed by igvn
2451 _igvn.set_type(call, call->Value(&_igvn));
2452 _igvn.set_type(ret, ret->Value(&_igvn));
2453
2454 // Before any new projection is added:
2455 CallProjections* projs = call->extract_projections(true, true);
2456
2457 // Create temporary hook nodes that will be replaced below.
2458 // Add an input to prevent hook nodes from being dead.
2459 Node* ctl = new Node(call);
2460 Node* mem = new Node(ctl);
2461 Node* io = new Node(ctl);
2462 Node* ex_ctl = new Node(ctl);
2463 Node* ex_mem = new Node(ctl);
2464 Node* ex_io = new Node(ctl);
2465 Node* res = new Node(ctl);
2466
2467 // Allocate a new buffered inline type only if a new one is not returned
2468 Node* cast = transform_later(new CastP2XNode(ctl, res));
2469 Node* mask = MakeConX(0x1);
2470 Node* masked = transform_later(new AndXNode(cast, mask));
2471 Node* cmp = transform_later(new CmpXNode(masked, mask));
2472 Node* bol = transform_later(new BoolNode(cmp, BoolTest::eq));
2473 IfNode* allocation_iff = new IfNode(ctl, bol, PROB_MAX, COUNT_UNKNOWN);
2474 transform_later(allocation_iff);
2475 Node* allocation_ctl = transform_later(new IfTrueNode(allocation_iff));
2476 Node* no_allocation_ctl = transform_later(new IfFalseNode(allocation_iff));
2477 Node* no_allocation_res = transform_later(new CheckCastPPNode(no_allocation_ctl, res, TypeInstPtr::BOTTOM));
2478
2479 // Try to allocate a new buffered inline instance either from TLAB or eden space
2480 Node* needgc_ctrl = NULL; // needgc means slowcase, i.e. allocation failed
2481 CallLeafNoFPNode* handler_call;
2482 const bool alloc_in_place = UseTLAB;
2483 if (alloc_in_place) {
2484 Node* fast_oop_ctrl = NULL;
2485 Node* fast_oop_rawmem = NULL;
2486 Node* mask2 = MakeConX(-2);
2487 Node* masked2 = transform_later(new AndXNode(cast, mask2));
2488 Node* rawklassptr = transform_later(new CastX2PNode(masked2));
2489 Node* klass_node = transform_later(new CheckCastPPNode(allocation_ctl, rawklassptr, TypeInstKlassPtr::OBJECT_OR_NULL));
2490 Node* layout_val = make_load(NULL, mem, klass_node, in_bytes(Klass::layout_helper_offset()), TypeInt::INT, T_INT);
2491 Node* size_in_bytes = ConvI2X(layout_val);
2492 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2493 Node* fast_oop = bs->obj_allocate(this, mem, allocation_ctl, size_in_bytes, io, needgc_ctrl,
2494 fast_oop_ctrl, fast_oop_rawmem,
2495 AllocateInstancePrefetchLines);
2496 // Allocation succeed, initialize buffered inline instance header firstly,
2497 // and then initialize its fields with an inline class specific handler
2498 Node* mark_node = makecon(TypeRawPtr::make((address)markWord::inline_type_prototype().value()));
2499 fast_oop_rawmem = make_store(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS);
2500 fast_oop_rawmem = make_store(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
2501 if (UseCompressedClassPointers) {
2502 fast_oop_rawmem = make_store(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::klass_gap_offset_in_bytes(), intcon(0), T_INT);
2503 }
2504 Node* fixed_block = make_load(fast_oop_ctrl, fast_oop_rawmem, klass_node, in_bytes(InstanceKlass::adr_inlineklass_fixed_block_offset()), TypeRawPtr::BOTTOM, T_ADDRESS);
2505 Node* pack_handler = make_load(fast_oop_ctrl, fast_oop_rawmem, fixed_block, in_bytes(InlineKlass::pack_handler_offset()), TypeRawPtr::BOTTOM, T_ADDRESS);
2506 handler_call = new CallLeafNoFPNode(OptoRuntime::pack_inline_type_Type(),
2507 NULL,
2508 "pack handler",
2509 TypeRawPtr::BOTTOM);
2510 handler_call->init_req(TypeFunc::Control, fast_oop_ctrl);
2511 handler_call->init_req(TypeFunc::Memory, fast_oop_rawmem);
2512 handler_call->init_req(TypeFunc::I_O, top());
2513 handler_call->init_req(TypeFunc::FramePtr, call->in(TypeFunc::FramePtr));
2514 handler_call->init_req(TypeFunc::ReturnAdr, top());
2515 handler_call->init_req(TypeFunc::Parms, pack_handler);
2516 handler_call->init_req(TypeFunc::Parms+1, fast_oop);
2517 } else {
2518 needgc_ctrl = allocation_ctl;
2519 }
2520
2521 // Allocation failed, fall back to a runtime call
2522 CallStaticJavaNode* slow_call = new CallStaticJavaNode(OptoRuntime::store_inline_type_fields_Type(),
2523 StubRoutines::store_inline_type_fields_to_buf(),
2524 "store_inline_type_fields",
2525 TypePtr::BOTTOM);
2526 slow_call->init_req(TypeFunc::Control, needgc_ctrl);
2527 slow_call->init_req(TypeFunc::Memory, mem);
2528 slow_call->init_req(TypeFunc::I_O, io);
2529 slow_call->init_req(TypeFunc::FramePtr, call->in(TypeFunc::FramePtr));
2530 slow_call->init_req(TypeFunc::ReturnAdr, call->in(TypeFunc::ReturnAdr));
2531 slow_call->init_req(TypeFunc::Parms, res);
2532
2533 Node* slow_ctl = transform_later(new ProjNode(slow_call, TypeFunc::Control));
2534 Node* slow_mem = transform_later(new ProjNode(slow_call, TypeFunc::Memory));
2535 Node* slow_io = transform_later(new ProjNode(slow_call, TypeFunc::I_O));
2536 Node* slow_res = transform_later(new ProjNode(slow_call, TypeFunc::Parms));
2537 Node* slow_catc = transform_later(new CatchNode(slow_ctl, slow_io, 2));
2538 Node* slow_norm = transform_later(new CatchProjNode(slow_catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci));
2539 Node* slow_excp = transform_later(new CatchProjNode(slow_catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci));
2540
2541 Node* ex_r = new RegionNode(3);
2542 Node* ex_mem_phi = new PhiNode(ex_r, Type::MEMORY, TypePtr::BOTTOM);
2543 Node* ex_io_phi = new PhiNode(ex_r, Type::ABIO);
2544 ex_r->init_req(1, slow_excp);
2545 ex_mem_phi->init_req(1, slow_mem);
2546 ex_io_phi->init_req(1, slow_io);
2547 ex_r->init_req(2, ex_ctl);
2548 ex_mem_phi->init_req(2, ex_mem);
2549 ex_io_phi->init_req(2, ex_io);
2550 transform_later(ex_r);
2551 transform_later(ex_mem_phi);
2552 transform_later(ex_io_phi);
2553
2554 // We don't know how many values are returned. This assumes the
2555 // worst case, that all available registers are used.
2556 for (uint i = TypeFunc::Parms+1; i < domain->cnt(); i++) {
2557 if (domain->field_at(i) == Type::HALF) {
2558 slow_call->init_req(i, top());
2559 if (alloc_in_place) {
2560 handler_call->init_req(i+1, top());
2561 }
2562 continue;
2563 }
2564 Node* proj = transform_later(new ProjNode(call, i));
2565 slow_call->init_req(i, proj);
2566 if (alloc_in_place) {
2567 handler_call->init_req(i+1, proj);
2568 }
2569 }
2570 // We can safepoint at that new call
2571 slow_call->copy_call_debug_info(&_igvn, call);
2572 transform_later(slow_call);
2573 if (alloc_in_place) {
2574 transform_later(handler_call);
2575 }
2576
2577 Node* fast_ctl = NULL;
2578 Node* fast_res = NULL;
2579 MergeMemNode* fast_mem = NULL;
2580 if (alloc_in_place) {
2581 fast_ctl = transform_later(new ProjNode(handler_call, TypeFunc::Control));
2582 Node* rawmem = transform_later(new ProjNode(handler_call, TypeFunc::Memory));
2583 fast_res = transform_later(new ProjNode(handler_call, TypeFunc::Parms));
2584 fast_mem = MergeMemNode::make(mem);
2585 fast_mem->set_memory_at(Compile::AliasIdxRaw, rawmem);
2586 transform_later(fast_mem);
2587 }
2588
2589 Node* r = new RegionNode(alloc_in_place ? 4 : 3);
2590 Node* mem_phi = new PhiNode(r, Type::MEMORY, TypePtr::BOTTOM);
2591 Node* io_phi = new PhiNode(r, Type::ABIO);
2592 Node* res_phi = new PhiNode(r, TypeInstPtr::BOTTOM);
2593 r->init_req(1, no_allocation_ctl);
2594 mem_phi->init_req(1, mem);
2595 io_phi->init_req(1, io);
2596 res_phi->init_req(1, no_allocation_res);
2597 r->init_req(2, slow_norm);
2598 mem_phi->init_req(2, slow_mem);
2599 io_phi->init_req(2, slow_io);
2600 res_phi->init_req(2, slow_res);
2601 if (alloc_in_place) {
2602 r->init_req(3, fast_ctl);
2603 mem_phi->init_req(3, fast_mem);
2604 io_phi->init_req(3, io);
2605 res_phi->init_req(3, fast_res);
2606 }
2607 transform_later(r);
2608 transform_later(mem_phi);
2609 transform_later(io_phi);
2610 transform_later(res_phi);
2611
2612 assert(projs->nb_resproj == 1, "unexpected number of results");
2613 _igvn.replace_in_uses(projs->fallthrough_catchproj, r);
2614 _igvn.replace_in_uses(projs->fallthrough_memproj, mem_phi);
2615 _igvn.replace_in_uses(projs->fallthrough_ioproj, io_phi);
2616 _igvn.replace_in_uses(projs->resproj[0], res_phi);
2617 _igvn.replace_in_uses(projs->catchall_catchproj, ex_r);
2618 _igvn.replace_in_uses(projs->catchall_memproj, ex_mem_phi);
2619 _igvn.replace_in_uses(projs->catchall_ioproj, ex_io_phi);
2620 // The CatchNode should not use the ex_io_phi. Re-connect it to the catchall_ioproj.
2621 Node* cn = projs->fallthrough_catchproj->in(0);
2622 _igvn.replace_input_of(cn, 1, projs->catchall_ioproj);
2623
2624 _igvn.replace_node(ctl, projs->fallthrough_catchproj);
2625 _igvn.replace_node(mem, projs->fallthrough_memproj);
2626 _igvn.replace_node(io, projs->fallthrough_ioproj);
2627 _igvn.replace_node(res, projs->resproj[0]);
2628 _igvn.replace_node(ex_ctl, projs->catchall_catchproj);
2629 _igvn.replace_node(ex_mem, projs->catchall_memproj);
2630 _igvn.replace_node(ex_io, projs->catchall_ioproj);
2631 }
2632
2633 void PhaseMacroExpand::expand_subtypecheck_node(SubTypeCheckNode *check) {
2634 assert(check->in(SubTypeCheckNode::Control) == NULL, "should be pinned");
2635 Node* bol = check->unique_out();
2636 Node* obj_or_subklass = check->in(SubTypeCheckNode::ObjOrSubKlass);
2637 Node* superklass = check->in(SubTypeCheckNode::SuperKlass);
2638 assert(bol->is_Bool() && bol->as_Bool()->_test._test == BoolTest::ne, "unexpected bool node");
2639
2640 for (DUIterator_Last imin, i = bol->last_outs(imin); i >= imin; --i) {
2641 Node* iff = bol->last_out(i);
2642 assert(iff->is_If(), "where's the if?");
2643
2644 if (iff->in(0)->is_top()) {
2645 _igvn.replace_input_of(iff, 1, C->top());
2646 continue;
2647 }
2648
2649 Node* iftrue = iff->as_If()->proj_out(1);
2650 Node* iffalse = iff->as_If()->proj_out(0);
2651 Node* ctrl = iff->in(0);
2652
2653 Node* subklass = NULL;
2654 if (_igvn.type(obj_or_subklass)->isa_klassptr()) {
2655 subklass = obj_or_subklass;
2656 } else {
2657 Node* k_adr = basic_plus_adr(obj_or_subklass, oopDesc::klass_offset_in_bytes());
2658 subklass = _igvn.transform(LoadKlassNode::make(_igvn, NULL, C->immutable_memory(), k_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
2659 }
2660
2661 Node* not_subtype_ctrl = Phase::gen_subtype_check(subklass, superklass, &ctrl, NULL, _igvn);
2662
2663 _igvn.replace_input_of(iff, 0, C->top());
2664 _igvn.replace_node(iftrue, not_subtype_ctrl);
2665 _igvn.replace_node(iffalse, ctrl);
2666 }
2667 _igvn.replace_node(check, C->top());
2668 }
2669
2670 // FlatArrayCheckNode (array1 array2 ...) is expanded into:
2671 //
2672 // long mark = array1.mark | array2.mark | ...;
2673 // long locked_bit = markWord::unlocked_value & array1.mark & array2.mark & ...;
2674 // if (locked_bit == 0) {
2675 // // One array is locked, load prototype header from the klass
2676 // mark = array1.klass.proto | array2.klass.proto | ...
2677 // }
2678 // if ((mark & markWord::flat_array_bit_in_place) == 0) {
2679 // ...
2680 // }
2681 void PhaseMacroExpand::expand_flatarraycheck_node(FlatArrayCheckNode* check) {
2682 bool array_inputs = _igvn.type(check->in(FlatArrayCheckNode::ArrayOrKlass))->isa_oopptr() != NULL;
2683 if (UseArrayMarkWordCheck && array_inputs) {
2684 Node* mark = MakeConX(0);
2685 Node* locked_bit = MakeConX(markWord::unlocked_value);
2686 Node* mem = check->in(FlatArrayCheckNode::Memory);
2687 for (uint i = FlatArrayCheckNode::ArrayOrKlass; i < check->req(); ++i) {
2688 Node* ary = check->in(i);
2689 const TypeOopPtr* t = _igvn.type(ary)->isa_oopptr();
2690 assert(t != NULL, "Mixing array and klass inputs");
2691 assert(!t->is_flat() && !t->is_not_flat(), "Should have been optimized out");
2692 Node* mark_adr = basic_plus_adr(ary, oopDesc::mark_offset_in_bytes());
2693 Node* mark_load = _igvn.transform(LoadNode::make(_igvn, NULL, mem, mark_adr, mark_adr->bottom_type()->is_ptr(), TypeX_X, TypeX_X->basic_type(), MemNode::unordered));
2694 mark = _igvn.transform(new OrXNode(mark, mark_load));
2695 locked_bit = _igvn.transform(new AndXNode(locked_bit, mark_load));
2696 }
2697 assert(!mark->is_Con(), "Should have been optimized out");
2698 Node* cmp = _igvn.transform(new CmpXNode(locked_bit, MakeConX(0)));
2699 Node* is_unlocked = _igvn.transform(new BoolNode(cmp, BoolTest::ne));
2700
2701 // BoolNode might be shared, replace each if user
2702 Node* old_bol = check->unique_out();
2703 assert(old_bol->is_Bool() && old_bol->as_Bool()->_test._test == BoolTest::ne, "unexpected condition");
2704 for (DUIterator_Last imin, i = old_bol->last_outs(imin); i >= imin; --i) {
2705 IfNode* old_iff = old_bol->last_out(i)->as_If();
2706 Node* ctrl = old_iff->in(0);
2707 RegionNode* region = new RegionNode(3);
2708 Node* mark_phi = new PhiNode(region, TypeX_X);
2709
2710 // Check if array is unlocked
2711 IfNode* iff = _igvn.transform(new IfNode(ctrl, is_unlocked, PROB_MAX, COUNT_UNKNOWN))->as_If();
2712
2713 // Unlocked: Use bits from mark word
2714 region->init_req(1, _igvn.transform(new IfTrueNode(iff)));
2715 mark_phi->init_req(1, mark);
2716
2717 // Locked: Load prototype header from klass
2718 ctrl = _igvn.transform(new IfFalseNode(iff));
2719 Node* proto = MakeConX(0);
2720 for (uint i = FlatArrayCheckNode::ArrayOrKlass; i < check->req(); ++i) {
2721 Node* ary = check->in(i);
2722 // Make loads control dependent to make sure they are only executed if array is locked
2723 Node* klass_adr = basic_plus_adr(ary, oopDesc::klass_offset_in_bytes());
2724 Node* klass = _igvn.transform(LoadKlassNode::make(_igvn, ctrl, C->immutable_memory(), klass_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
2725 Node* proto_adr = basic_plus_adr(klass, in_bytes(Klass::prototype_header_offset()));
2726 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));
2727 proto = _igvn.transform(new OrXNode(proto, proto_load));
2728 }
2729 region->init_req(2, ctrl);
2730 mark_phi->init_req(2, proto);
2731
2732 // Check if flat array bits are set
2733 Node* mask = MakeConX(markWord::flat_array_bit_in_place);
2734 Node* masked = _igvn.transform(new AndXNode(_igvn.transform(mark_phi), mask));
2735 cmp = _igvn.transform(new CmpXNode(masked, MakeConX(0)));
2736 Node* is_not_flat = _igvn.transform(new BoolNode(cmp, BoolTest::eq));
2737
2738 ctrl = _igvn.transform(region);
2739 iff = _igvn.transform(new IfNode(ctrl, is_not_flat, PROB_MAX, COUNT_UNKNOWN))->as_If();
2740 _igvn.replace_node(old_iff, iff);
2741 }
2742 _igvn.replace_node(check, C->top());
2743 } else {
2744 // Fall back to layout helper check
2745 Node* lhs = intcon(0);
2746 for (uint i = FlatArrayCheckNode::ArrayOrKlass; i < check->req(); ++i) {
2747 Node* array_or_klass = check->in(i);
2748 Node* klass = NULL;
2749 const TypePtr* t = _igvn.type(array_or_klass)->is_ptr();
2750 assert(!t->is_flat() && !t->is_not_flat(), "Should have been optimized out");
2751 if (t->isa_oopptr() != NULL) {
2752 Node* klass_adr = basic_plus_adr(array_or_klass, oopDesc::klass_offset_in_bytes());
2753 klass = transform_later(LoadKlassNode::make(_igvn, NULL, C->immutable_memory(), klass_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
2754 } else {
2755 assert(t->isa_aryklassptr(), "Unexpected input type");
2756 klass = array_or_klass;
2757 }
2758 Node* lh_addr = basic_plus_adr(klass, in_bytes(Klass::layout_helper_offset()));
2759 Node* lh_val = _igvn.transform(LoadNode::make(_igvn, NULL, C->immutable_memory(), lh_addr, lh_addr->bottom_type()->is_ptr(), TypeInt::INT, T_INT, MemNode::unordered));
2760 lhs = _igvn.transform(new OrINode(lhs, lh_val));
2761 }
2762 Node* masked = transform_later(new AndINode(lhs, intcon(Klass::_lh_array_tag_flat_value_bit_inplace)));
2763 Node* cmp = transform_later(new CmpINode(masked, intcon(0)));
2764 Node* bol = transform_later(new BoolNode(cmp, BoolTest::eq));
2765 Node* old_bol = check->unique_out();
2766 _igvn.replace_node(old_bol, bol);
2767 _igvn.replace_node(check, C->top());
2768 }
2769 }
2770
2771 //---------------------------eliminate_macro_nodes----------------------
2772 // Eliminate scalar replaced allocations and associated locks.
2773 void PhaseMacroExpand::eliminate_macro_nodes() {
2774 if (C->macro_count() == 0)
2775 return;
2776 NOT_PRODUCT(int membar_before = count_MemBar(C);)
2777
2778 // Before elimination may re-mark (change to Nested or NonEscObj)
2779 // all associated (same box and obj) lock and unlock nodes.
2780 int cnt = C->macro_count();
2781 for (int i=0; i < cnt; i++) {
2782 Node *n = C->macro_node(i);
2783 if (n->is_AbstractLock()) { // Lock and Unlock nodes
2784 mark_eliminated_locking_nodes(n->as_AbstractLock());
2785 }
2786 }
2787 // Re-marking may break consistency of Coarsened locks.
2788 if (!C->coarsened_locks_consistent()) {
2789 return; // recompile without Coarsened locks if broken
2790 }
2811 }
2812 // Next, attempt to eliminate allocations
2813 _has_locks = false;
2814 progress = true;
2815 while (progress) {
2816 progress = false;
2817 for (int i = C->macro_count(); i > 0; i = MIN2(i - 1, C->macro_count())) { // more than 1 element can be eliminated at once
2818 Node* n = C->macro_node(i - 1);
2819 bool success = false;
2820 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2821 switch (n->class_id()) {
2822 case Node::Class_Allocate:
2823 case Node::Class_AllocateArray:
2824 success = eliminate_allocate_node(n->as_Allocate());
2825 #ifndef PRODUCT
2826 if (success && PrintOptoStatistics) {
2827 Atomic::inc(&PhaseMacroExpand::_objs_scalar_replaced_counter);
2828 }
2829 #endif
2830 break;
2831 case Node::Class_CallStaticJava: {
2832 CallStaticJavaNode* call = n->as_CallStaticJava();
2833 if (!call->method()->is_method_handle_intrinsic()) {
2834 success = eliminate_boxing_node(n->as_CallStaticJava());
2835 }
2836 break;
2837 }
2838 case Node::Class_Lock:
2839 case Node::Class_Unlock:
2840 assert(!n->as_AbstractLock()->is_eliminated(), "sanity");
2841 _has_locks = true;
2842 break;
2843 case Node::Class_ArrayCopy:
2844 break;
2845 case Node::Class_OuterStripMinedLoop:
2846 break;
2847 case Node::Class_SubTypeCheck:
2848 break;
2849 case Node::Class_Opaque1:
2850 break;
2851 case Node::Class_FlatArrayCheck:
2852 break;
2853 default:
2854 assert(n->Opcode() == Op_LoopLimit ||
2855 n->Opcode() == Op_Opaque2 ||
2856 n->Opcode() == Op_Opaque3 ||
2857 n->Opcode() == Op_Opaque4 ||
2858 BarrierSet::barrier_set()->barrier_set_c2()->is_gc_barrier_node(n),
2859 "unknown node type in macro list");
2860 }
2861 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2862 progress = progress || success;
2863 }
2864 }
2865 #ifndef PRODUCT
2866 if (PrintOptoStatistics) {
2867 int membar_after = count_MemBar(C);
2868 Atomic::add(&PhaseMacroExpand::_memory_barriers_removed_counter, membar_before - membar_after);
2869 }
2870 #endif
2871 }
2872
2874 // Returns true if a failure occurred.
2875 bool PhaseMacroExpand::expand_macro_nodes() {
2876 // Last attempt to eliminate macro nodes.
2877 eliminate_macro_nodes();
2878 if (C->failing()) return true;
2879
2880 // Eliminate Opaque and LoopLimit nodes. Do it after all loop optimizations.
2881 bool progress = true;
2882 while (progress) {
2883 progress = false;
2884 for (int i = C->macro_count(); i > 0; i--) {
2885 Node* n = C->macro_node(i-1);
2886 bool success = false;
2887 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2888 if (n->Opcode() == Op_LoopLimit) {
2889 // Remove it from macro list and put on IGVN worklist to optimize.
2890 C->remove_macro_node(n);
2891 _igvn._worklist.push(n);
2892 success = true;
2893 } else if (n->Opcode() == Op_CallStaticJava) {
2894 CallStaticJavaNode* call = n->as_CallStaticJava();
2895 if (!call->method()->is_method_handle_intrinsic()) {
2896 // Remove it from macro list and put on IGVN worklist to optimize.
2897 C->remove_macro_node(n);
2898 _igvn._worklist.push(n);
2899 success = true;
2900 }
2901 } else if (n->is_Opaque1() || n->Opcode() == Op_Opaque2) {
2902 _igvn.replace_node(n, n->in(1));
2903 success = true;
2904 #if INCLUDE_RTM_OPT
2905 } else if ((n->Opcode() == Op_Opaque3) && ((Opaque3Node*)n)->rtm_opt()) {
2906 assert(C->profile_rtm(), "should be used only in rtm deoptimization code");
2907 assert((n->outcnt() == 1) && n->unique_out()->is_Cmp(), "");
2908 Node* cmp = n->unique_out();
2909 #ifdef ASSERT
2910 // Validate graph.
2911 assert((cmp->outcnt() == 1) && cmp->unique_out()->is_Bool(), "");
2912 BoolNode* bol = cmp->unique_out()->as_Bool();
2913 assert((bol->outcnt() == 1) && bol->unique_out()->is_If() &&
2914 (bol->_test._test == BoolTest::ne), "");
2915 IfNode* ifn = bol->unique_out()->as_If();
2916 assert((ifn->outcnt() == 2) &&
2917 ifn->proj_out(1)->is_uncommon_trap_proj(Deoptimization::Reason_rtm_state_change) != NULL, "");
2918 #endif
2919 Node* repl = n->in(1);
2920 if (!_has_locks) {
2983 // Worst case is a macro node gets expanded into about 200 nodes.
2984 // Allow 50% more for optimization.
2985 if (C->check_node_count(300, "out of nodes before macro expansion")) {
2986 return true;
2987 }
2988
2989 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2990 switch (n->class_id()) {
2991 case Node::Class_Lock:
2992 expand_lock_node(n->as_Lock());
2993 break;
2994 case Node::Class_Unlock:
2995 expand_unlock_node(n->as_Unlock());
2996 break;
2997 case Node::Class_ArrayCopy:
2998 expand_arraycopy_node(n->as_ArrayCopy());
2999 break;
3000 case Node::Class_SubTypeCheck:
3001 expand_subtypecheck_node(n->as_SubTypeCheck());
3002 break;
3003 case Node::Class_CallStaticJava:
3004 expand_mh_intrinsic_return(n->as_CallStaticJava());
3005 C->remove_macro_node(n);
3006 break;
3007 case Node::Class_FlatArrayCheck:
3008 expand_flatarraycheck_node(n->as_FlatArrayCheck());
3009 break;
3010 default:
3011 assert(false, "unknown node type in macro list");
3012 }
3013 assert(C->macro_count() == (old_macro_count - 1), "expansion must have deleted one node from macro list");
3014 if (C->failing()) return true;
3015
3016 // Clean up the graph so we're less likely to hit the maximum node
3017 // limit
3018 _igvn.set_delay_transform(false);
3019 _igvn.optimize();
3020 if (C->failing()) return true;
3021 _igvn.set_delay_transform(true);
3022 }
3023
3024 // All nodes except Allocate nodes are expanded now. There could be
3025 // new optimization opportunities (such as folding newly created
3026 // load from a just allocated object). Run IGVN.
3027
3028 // expand "macro" nodes
3029 // nodes are removed from the macro list as they are processed
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