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/sharedRuntime.hpp"
55 #include "utilities/macros.hpp"
56 #include "utilities/powerOfTwo.hpp"
57 #if INCLUDE_G1GC
58 #include "gc/g1/g1ThreadLocalData.hpp"
59 #endif // INCLUDE_G1GC
60 #if INCLUDE_SHENANDOAHGC
61 #include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp"
62 #endif
63
64
65 //
66 // Replace any references to "oldref" in inputs to "use" with "newref".
67 // Returns the number of replacements made.
68 //
69 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) {
70 int nreplacements = 0;
71 uint req = use->req();
72 for (uint j = 0; j < use->len(); j++) {
73 Node *uin = use->in(j);
74 if (uin == oldref) {
75 if (j < req)
76 use->set_req(j, newref);
77 else
78 use->set_prec(j, newref);
79 nreplacements++;
80 } else if (j >= req && uin == NULL) {
81 break;
82 }
83 }
84 return nreplacements;
85 }
86
87 void PhaseMacroExpand::migrate_outs(Node *old, Node *target) {
88 assert(old != NULL, "sanity");
89 for (DUIterator_Fast imax, i = old->fast_outs(imax); i < imax; i++) {
90 Node* use = old->fast_out(i);
91 _igvn.rehash_node_delayed(use);
92 imax -= replace_input(use, old, target);
93 // back up iterator
94 --i;
95 }
96 assert(old->outcnt() == 0, "all uses must be deleted");
97 }
98
99 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word, int mask, int bits, bool return_fast_path) {
100 Node* cmp;
101 if (mask != 0) {
102 Node* and_node = transform_later(new AndXNode(word, MakeConX(mask)));
103 cmp = transform_later(new CmpXNode(and_node, MakeConX(bits)));
104 } else {
105 cmp = word;
106 }
107 Node* bol = transform_later(new BoolNode(cmp, BoolTest::ne));
108 IfNode* iff = new IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
109 transform_later(iff);
110
111 // Fast path taken.
112 Node *fast_taken = transform_later(new IfFalseNode(iff));
113
114 // Fast path not-taken, i.e. slow path
115 Node *slow_taken = transform_later(new IfTrueNode(iff));
116
117 if (return_fast_path) {
118 region->init_req(edge, slow_taken); // Capture slow-control
141 // Slow-path call
142 CallNode *call = leaf_name
143 ? (CallNode*)new CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM )
144 : (CallNode*)new CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), TypeRawPtr::BOTTOM );
145
146 // Slow path call has no side-effects, uses few values
147 copy_predefined_input_for_runtime_call(slow_path, oldcall, call );
148 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0);
149 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1);
150 if (parm2 != NULL) call->init_req(TypeFunc::Parms+2, parm2);
151 call->copy_call_debug_info(&_igvn, oldcall);
152 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
153 _igvn.replace_node(oldcall, call);
154 transform_later(call);
155
156 return call;
157 }
158
159 void PhaseMacroExpand::eliminate_gc_barrier(Node* p2x) {
160 BarrierSetC2 *bs = BarrierSet::barrier_set()->barrier_set_c2();
161 bs->eliminate_gc_barrier(this, p2x);
162 }
163
164 // Search for a memory operation for the specified memory slice.
165 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) {
166 Node *orig_mem = mem;
167 Node *alloc_mem = alloc->in(TypeFunc::Memory);
168 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr();
169 while (true) {
170 if (mem == alloc_mem || mem == start_mem ) {
171 return mem; // hit one of our sentinels
172 } else if (mem->is_MergeMem()) {
173 mem = mem->as_MergeMem()->memory_at(alias_idx);
174 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) {
175 Node *in = mem->in(0);
176 // we can safely skip over safepoints, calls, locks and membars because we
177 // already know that the object is safe to eliminate.
178 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) {
179 return in;
180 } else if (in->is_Call()) {
181 CallNode *call = in->as_Call();
190 ArrayCopyNode* ac = NULL;
191 if (ArrayCopyNode::may_modify(tinst, in->as_MemBar(), phase, ac)) {
192 if (ac != NULL) {
193 assert(ac->is_clonebasic(), "Only basic clone is a non escaping clone");
194 return ac;
195 }
196 }
197 mem = in->in(TypeFunc::Memory);
198 } else {
199 #ifdef ASSERT
200 in->dump();
201 mem->dump();
202 assert(false, "unexpected projection");
203 #endif
204 }
205 } else if (mem->is_Store()) {
206 const TypePtr* atype = mem->as_Store()->adr_type();
207 int adr_idx = phase->C->get_alias_index(atype);
208 if (adr_idx == alias_idx) {
209 assert(atype->isa_oopptr(), "address type must be oopptr");
210 int adr_offset = atype->offset();
211 uint adr_iid = atype->is_oopptr()->instance_id();
212 // Array elements references have the same alias_idx
213 // but different offset and different instance_id.
214 if (adr_offset == offset && adr_iid == alloc->_idx) {
215 return mem;
216 }
217 } else {
218 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw");
219 }
220 mem = mem->in(MemNode::Memory);
221 } else if (mem->is_ClearArray()) {
222 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) {
223 // Can not bypass initialization of the instance
224 // we are looking.
225 debug_only(intptr_t offset;)
226 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity");
227 InitializeNode* init = alloc->as_Allocate()->initialization();
228 // We are looking for stored value, return Initialize node
229 // or memory edge from Allocate node.
230 if (init != NULL) {
235 }
236 // Otherwise skip it (the call updated 'mem' value).
237 } else if (mem->Opcode() == Op_SCMemProj) {
238 mem = mem->in(0);
239 Node* adr = NULL;
240 if (mem->is_LoadStore()) {
241 adr = mem->in(MemNode::Address);
242 } else {
243 assert(mem->Opcode() == Op_EncodeISOArray ||
244 mem->Opcode() == Op_StrCompressedCopy, "sanity");
245 adr = mem->in(3); // Destination array
246 }
247 const TypePtr* atype = adr->bottom_type()->is_ptr();
248 int adr_idx = phase->C->get_alias_index(atype);
249 if (adr_idx == alias_idx) {
250 DEBUG_ONLY(mem->dump();)
251 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
252 return NULL;
253 }
254 mem = mem->in(MemNode::Memory);
255 } else if (mem->Opcode() == Op_StrInflatedCopy) {
256 Node* adr = mem->in(3); // Destination array
257 const TypePtr* atype = adr->bottom_type()->is_ptr();
258 int adr_idx = phase->C->get_alias_index(atype);
259 if (adr_idx == alias_idx) {
260 DEBUG_ONLY(mem->dump();)
261 assert(false, "Object is not scalar replaceable if a StrInflatedCopy node accesses its field");
262 return NULL;
263 }
264 mem = mem->in(MemNode::Memory);
265 } else {
266 return mem;
267 }
268 assert(mem != orig_mem, "dead memory loop");
269 }
270 }
271
272 // Generate loads from source of the arraycopy for fields of
273 // destination needed at a deoptimization point
274 Node* PhaseMacroExpand::make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, Node* mem, BasicType ft, const Type *ftype, AllocateNode *alloc) {
275 BasicType bt = ft;
280 }
281 Node* res = NULL;
282 if (ac->is_clonebasic()) {
283 assert(ac->in(ArrayCopyNode::Src) != ac->in(ArrayCopyNode::Dest), "clone source equals destination");
284 Node* base = ac->in(ArrayCopyNode::Src);
285 Node* adr = _igvn.transform(new AddPNode(base, base, MakeConX(offset)));
286 const TypePtr* adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
287 MergeMemNode* mergemen = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
288 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
289 res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemen, adr, adr_type, type, bt);
290 } else {
291 if (ac->modifies(offset, offset, &_igvn, true)) {
292 assert(ac->in(ArrayCopyNode::Dest) == alloc->result_cast(), "arraycopy destination should be allocation's result");
293 uint shift = exact_log2(type2aelembytes(bt));
294 Node* src_pos = ac->in(ArrayCopyNode::SrcPos);
295 Node* dest_pos = ac->in(ArrayCopyNode::DestPos);
296 const TypeInt* src_pos_t = _igvn.type(src_pos)->is_int();
297 const TypeInt* dest_pos_t = _igvn.type(dest_pos)->is_int();
298
299 Node* adr = NULL;
300 const TypePtr* adr_type = NULL;
301 if (src_pos_t->is_con() && dest_pos_t->is_con()) {
302 intptr_t off = ((src_pos_t->get_con() - dest_pos_t->get_con()) << shift) + offset;
303 Node* base = ac->in(ArrayCopyNode::Src);
304 adr = _igvn.transform(new AddPNode(base, base, MakeConX(off)));
305 adr_type = _igvn.type(base)->is_ptr()->add_offset(off);
306 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
307 // Don't emit a new load from src if src == dst but try to get the value from memory instead
308 return value_from_mem(ac->in(TypeFunc::Memory), ctl, ft, ftype, adr_type->isa_oopptr(), alloc);
309 }
310 } else {
311 Node* diff = _igvn.transform(new SubINode(ac->in(ArrayCopyNode::SrcPos), ac->in(ArrayCopyNode::DestPos)));
312 #ifdef _LP64
313 diff = _igvn.transform(new ConvI2LNode(diff));
314 #endif
315 diff = _igvn.transform(new LShiftXNode(diff, intcon(shift)));
316
317 Node* off = _igvn.transform(new AddXNode(MakeConX(offset), diff));
318 Node* base = ac->in(ArrayCopyNode::Src);
319 adr = _igvn.transform(new AddPNode(base, base, off));
320 adr_type = _igvn.type(base)->is_ptr()->add_offset(Type::OffsetBot);
321 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
322 // Non constant offset in the array: we can't statically
323 // determine the value
324 return NULL;
325 }
326 }
327 MergeMemNode* mergemen = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
328 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
329 res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemen, adr, adr_type, type, bt);
330 }
331 }
332 if (res != NULL) {
333 if (ftype->isa_narrowoop()) {
334 // PhaseMacroExpand::scalar_replacement adds DecodeN nodes
335 res = _igvn.transform(new EncodePNode(res, ftype));
336 }
337 return res;
338 }
339 return NULL;
340 }
341
342 //
343 // Given a Memory Phi, compute a value Phi containing the values from stores
344 // on the input paths.
345 // Note: this function is recursive, its depth is limited by the "level" argument
346 // Returns the computed Phi, or NULL if it cannot compute it.
347 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) {
348 assert(mem->is_Phi(), "sanity");
349 int alias_idx = C->get_alias_index(adr_t);
350 int offset = adr_t->offset();
351 int instance_id = adr_t->instance_id();
352
353 // Check if an appropriate value phi already exists.
354 Node* region = mem->in(0);
355 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) {
356 Node* phi = region->fast_out(k);
357 if (phi->is_Phi() && phi != mem &&
358 phi->as_Phi()->is_same_inst_field(phi_type, (int)mem->_idx, instance_id, alias_idx, offset)) {
359 return phi;
360 }
361 }
362 // Check if an appropriate new value phi already exists.
363 Node* new_phi = value_phis->find(mem->_idx);
364 if (new_phi != NULL)
365 return new_phi;
366
367 if (level <= 0) {
368 return NULL; // Give up: phi tree too deep
369 }
370 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
371 Node *alloc_mem = alloc->in(TypeFunc::Memory);
372
373 uint length = mem->req();
374 GrowableArray <Node *> values(length, length, NULL);
375
376 // create a new Phi for the value
377 PhiNode *phi = new PhiNode(mem->in(0), phi_type, NULL, mem->_idx, instance_id, alias_idx, offset);
378 transform_later(phi);
379 value_phis->push(phi, mem->_idx);
380
381 for (uint j = 1; j < length; j++) {
382 Node *in = mem->in(j);
383 if (in == NULL || in->is_top()) {
384 values.at_put(j, in);
385 } else {
386 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn);
387 if (val == start_mem || val == alloc_mem) {
388 // hit a sentinel, return appropriate 0 value
389 values.at_put(j, _igvn.zerocon(ft));
390 continue;
391 }
392 if (val->is_Initialize()) {
393 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
394 }
395 if (val == NULL) {
396 return NULL; // can't find a value on this path
397 }
398 if (val == mem) {
399 values.at_put(j, mem);
400 } else if (val->is_Store()) {
401 Node* n = val->in(MemNode::ValueIn);
402 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
403 n = bs->step_over_gc_barrier(n);
404 if (is_subword_type(ft)) {
405 n = Compile::narrow_value(ft, n, phi_type, &_igvn, true);
406 }
407 values.at_put(j, n);
408 } else if(val->is_Proj() && val->in(0) == alloc) {
409 values.at_put(j, _igvn.zerocon(ft));
410 } else if (val->is_Phi()) {
411 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1);
412 if (val == NULL) {
413 return NULL;
414 }
415 values.at_put(j, val);
416 } else if (val->Opcode() == Op_SCMemProj) {
417 assert(val->in(0)->is_LoadStore() ||
418 val->in(0)->Opcode() == Op_EncodeISOArray ||
419 val->in(0)->Opcode() == Op_StrCompressedCopy, "sanity");
420 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
421 return NULL;
422 } else if (val->is_ArrayCopy()) {
423 Node* res = make_arraycopy_load(val->as_ArrayCopy(), offset, val->in(0), val->in(TypeFunc::Memory), ft, phi_type, alloc);
424 if (res == NULL) {
425 return NULL;
426 }
427 values.at_put(j, res);
428 } else {
429 DEBUG_ONLY( val->dump(); )
433 }
434 }
435 // Set Phi's inputs
436 for (uint j = 1; j < length; j++) {
437 if (values.at(j) == mem) {
438 phi->init_req(j, phi);
439 } else {
440 phi->init_req(j, values.at(j));
441 }
442 }
443 return phi;
444 }
445
446 // Search the last value stored into the object's field.
447 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, Node *sfpt_ctl, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, AllocateNode *alloc) {
448 assert(adr_t->is_known_instance_field(), "instance required");
449 int instance_id = adr_t->instance_id();
450 assert((uint)instance_id == alloc->_idx, "wrong allocation");
451
452 int alias_idx = C->get_alias_index(adr_t);
453 int offset = adr_t->offset();
454 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
455 Node *alloc_ctrl = alloc->in(TypeFunc::Control);
456 Node *alloc_mem = alloc->in(TypeFunc::Memory);
457 VectorSet visited;
458
459 bool done = sfpt_mem == alloc_mem;
460 Node *mem = sfpt_mem;
461 while (!done) {
462 if (visited.test_set(mem->_idx)) {
463 return NULL; // found a loop, give up
464 }
465 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn);
466 if (mem == start_mem || mem == alloc_mem) {
467 done = true; // hit a sentinel, return appropriate 0 value
468 } else if (mem->is_Initialize()) {
469 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
470 if (mem == NULL) {
471 done = true; // Something go wrong.
472 } else if (mem->is_Store()) {
473 const TypePtr* atype = mem->as_Store()->adr_type();
474 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice");
475 done = true;
476 }
477 } else if (mem->is_Store()) {
478 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr();
479 assert(atype != NULL, "address type must be oopptr");
480 assert(C->get_alias_index(atype) == alias_idx &&
481 atype->is_known_instance_field() && atype->offset() == offset &&
482 atype->instance_id() == instance_id, "store is correct memory slice");
483 done = true;
484 } else if (mem->is_Phi()) {
485 // try to find a phi's unique input
486 Node *unique_input = NULL;
487 Node *top = C->top();
488 for (uint i = 1; i < mem->req(); i++) {
489 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn);
490 if (n == NULL || n == top || n == mem) {
491 continue;
492 } else if (unique_input == NULL) {
493 unique_input = n;
494 } else if (unique_input != n) {
495 unique_input = top;
496 break;
497 }
498 }
499 if (unique_input != NULL && unique_input != top) {
500 mem = unique_input;
501 } else {
502 done = true;
503 }
504 } else if (mem->is_ArrayCopy()) {
505 done = true;
506 } else {
507 DEBUG_ONLY( mem->dump(); )
508 assert(false, "unexpected node");
509 }
510 }
511 if (mem != NULL) {
512 if (mem == start_mem || mem == alloc_mem) {
513 // hit a sentinel, return appropriate 0 value
514 return _igvn.zerocon(ft);
515 } else if (mem->is_Store()) {
516 Node* n = mem->in(MemNode::ValueIn);
517 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
518 n = bs->step_over_gc_barrier(n);
519 return n;
520 } else if (mem->is_Phi()) {
521 // attempt to produce a Phi reflecting the values on the input paths of the Phi
522 Node_Stack value_phis(8);
523 Node* phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit);
524 if (phi != NULL) {
525 return phi;
526 } else {
527 // Kill all new Phis
528 while(value_phis.is_nonempty()) {
529 Node* n = value_phis.node();
530 _igvn.replace_node(n, C->top());
531 value_phis.pop();
532 }
533 }
534 } else if (mem->is_ArrayCopy()) {
535 Node* ctl = mem->in(0);
536 Node* m = mem->in(TypeFunc::Memory);
537 if (sfpt_ctl->is_Proj() && sfpt_ctl->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) {
538 // pin the loads in the uncommon trap path
539 ctl = sfpt_ctl;
540 m = sfpt_mem;
541 }
542 return make_arraycopy_load(mem->as_ArrayCopy(), offset, ctl, m, ft, ftype, alloc);
543 }
544 }
545 // Something go wrong.
546 return NULL;
547 }
548
549 // Check the possibility of scalar replacement.
550 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
551 // Scan the uses of the allocation to check for anything that would
552 // prevent us from eliminating it.
553 NOT_PRODUCT( const char* fail_eliminate = NULL; )
554 DEBUG_ONLY( Node* disq_node = NULL; )
555 bool can_eliminate = true;
556
557 Node* res = alloc->result_cast();
558 const TypeOopPtr* res_type = NULL;
559 if (res == NULL) {
560 // All users were eliminated.
561 } else if (!res->is_CheckCastPP()) {
562 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";)
563 can_eliminate = false;
564 } else {
565 res_type = _igvn.type(res)->isa_oopptr();
566 if (res_type == NULL) {
567 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";)
568 can_eliminate = false;
569 } else if (res_type->isa_aryptr()) {
570 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1);
571 if (length < 0) {
572 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";)
573 can_eliminate = false;
574 }
575 }
576 }
577
578 if (can_eliminate && res != NULL) {
579 for (DUIterator_Fast jmax, j = res->fast_outs(jmax);
580 j < jmax && can_eliminate; j++) {
581 Node* use = res->fast_out(j);
582
583 if (use->is_AddP()) {
584 const TypePtr* addp_type = _igvn.type(use)->is_ptr();
585 int offset = addp_type->offset();
586
587 if (offset == Type::OffsetTop || offset == Type::OffsetBot) {
588 NOT_PRODUCT(fail_eliminate = "Undefined field referrence";)
589 can_eliminate = false;
590 break;
591 }
592 for (DUIterator_Fast kmax, k = use->fast_outs(kmax);
593 k < kmax && can_eliminate; k++) {
594 Node* n = use->fast_out(k);
595 if (!n->is_Store() && n->Opcode() != Op_CastP2X
596 SHENANDOAHGC_ONLY(&& (!UseShenandoahGC || !ShenandoahBarrierSetC2::is_shenandoah_wb_pre_call(n))) ) {
597 DEBUG_ONLY(disq_node = n;)
598 if (n->is_Load() || n->is_LoadStore()) {
599 NOT_PRODUCT(fail_eliminate = "Field load";)
600 } else {
601 NOT_PRODUCT(fail_eliminate = "Not store field referrence";)
602 }
603 can_eliminate = false;
604 }
605 }
606 } else if (use->is_ArrayCopy() &&
607 (use->as_ArrayCopy()->is_clonebasic() ||
608 use->as_ArrayCopy()->is_arraycopy_validated() ||
609 use->as_ArrayCopy()->is_copyof_validated() ||
610 use->as_ArrayCopy()->is_copyofrange_validated()) &&
611 use->in(ArrayCopyNode::Dest) == res) {
612 // ok to eliminate
613 } else if (use->is_SafePoint()) {
614 SafePointNode* sfpt = use->as_SafePoint();
615 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) {
616 // Object is passed as argument.
617 DEBUG_ONLY(disq_node = use;)
618 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";)
619 can_eliminate = false;
620 }
621 Node* sfptMem = sfpt->memory();
622 if (sfptMem == NULL || sfptMem->is_top()) {
623 DEBUG_ONLY(disq_node = use;)
624 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";)
625 can_eliminate = false;
626 } else {
627 safepoints.append_if_missing(sfpt);
628 }
629 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark
630 if (use->is_Phi()) {
631 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) {
632 NOT_PRODUCT(fail_eliminate = "Object is return value";)
633 } else {
634 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";)
635 }
636 DEBUG_ONLY(disq_node = use;)
637 } else {
638 if (use->Opcode() == Op_Return) {
639 NOT_PRODUCT(fail_eliminate = "Object is return value";)
640 }else {
641 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";)
642 }
643 DEBUG_ONLY(disq_node = use;)
644 }
645 can_eliminate = false;
646 }
647 }
648 }
649
650 #ifndef PRODUCT
651 if (PrintEliminateAllocations) {
652 if (can_eliminate) {
653 tty->print("Scalar ");
654 if (res == NULL)
655 alloc->dump();
656 else
657 res->dump();
658 } else if (alloc->_is_scalar_replaceable) {
659 tty->print("NotScalar (%s)", fail_eliminate);
660 if (res == NULL)
661 alloc->dump();
662 else
663 res->dump();
664 #ifdef ASSERT
665 if (disq_node != NULL) {
666 tty->print(" >>>> ");
667 disq_node->dump();
668 }
669 #endif /*ASSERT*/
670 }
671 }
672 #endif
673 return can_eliminate;
674 }
675
676 // Do scalar replacement.
677 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
678 GrowableArray <SafePointNode *> safepoints_done;
688 Node* res = alloc->result_cast();
689 assert(res == NULL || res->is_CheckCastPP(), "unexpected AllocateNode result");
690 const TypeOopPtr* res_type = NULL;
691 if (res != NULL) { // Could be NULL when there are no users
692 res_type = _igvn.type(res)->isa_oopptr();
693 }
694
695 if (res != NULL) {
696 klass = res_type->klass();
697 if (res_type->isa_instptr()) {
698 // find the fields of the class which will be needed for safepoint debug information
699 assert(klass->is_instance_klass(), "must be an instance klass.");
700 iklass = klass->as_instance_klass();
701 nfields = iklass->nof_nonstatic_fields();
702 } else {
703 // find the array's elements which will be needed for safepoint debug information
704 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1);
705 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass.");
706 elem_type = klass->as_array_klass()->element_type();
707 basic_elem_type = elem_type->basic_type();
708 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
709 element_size = type2aelembytes(basic_elem_type);
710 }
711 }
712 //
713 // Process the safepoint uses
714 //
715 while (safepoints.length() > 0) {
716 SafePointNode* sfpt = safepoints.pop();
717 Node* mem = sfpt->memory();
718 Node* ctl = sfpt->control();
719 assert(sfpt->jvms() != NULL, "missed JVMS");
720 // Fields of scalar objs are referenced only at the end
721 // of regular debuginfo at the last (youngest) JVMS.
722 // Record relative start index.
723 uint first_ind = (sfpt->req() - sfpt->jvms()->scloff());
724 SafePointScalarObjectNode* sobj = new SafePointScalarObjectNode(res_type,
725 #ifdef ASSERT
726 alloc,
727 #endif
728 first_ind, nfields);
729 sobj->init_req(0, C->root());
730 transform_later(sobj);
731
732 // Scan object's fields adding an input to the safepoint for each field.
733 for (int j = 0; j < nfields; j++) {
734 intptr_t offset;
735 ciField* field = NULL;
736 if (iklass != NULL) {
737 field = iklass->nonstatic_field_at(j);
738 offset = field->offset();
739 elem_type = field->type();
740 basic_elem_type = field->layout_type();
741 } else {
742 offset = array_base + j * (intptr_t)element_size;
743 }
744
745 const Type *field_type;
746 // The next code is taken from Parse::do_get_xxx().
747 if (is_reference_type(basic_elem_type)) {
748 if (!elem_type->is_loaded()) {
749 field_type = TypeInstPtr::BOTTOM;
750 } else if (field != NULL && field->is_static_constant()) {
751 // This can happen if the constant oop is non-perm.
752 ciObject* con = field->constant_value().as_object();
753 // Do not "join" in the previous type; it doesn't add value,
754 // and may yield a vacuous result if the field is of interface type.
755 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
756 assert(field_type != NULL, "field singleton type must be consistent");
757 } else {
758 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
759 }
760 if (UseCompressedOops) {
761 field_type = field_type->make_narrowoop();
762 basic_elem_type = T_NARROWOOP;
763 }
764 } else {
765 field_type = Type::get_const_basic_type(basic_elem_type);
766 }
767
768 const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr();
769
770 Node *field_val = value_from_mem(mem, ctl, basic_elem_type, field_type, field_addr_type, alloc);
771 if (field_val == NULL) {
772 // We weren't able to find a value for this field,
773 // give up on eliminating this allocation.
774
775 // Remove any extra entries we added to the safepoint.
776 uint last = sfpt->req() - 1;
777 for (int k = 0; k < j; k++) {
778 sfpt->del_req(last--);
779 }
780 _igvn._worklist.push(sfpt);
781 // rollback processed safepoints
782 while (safepoints_done.length() > 0) {
783 SafePointNode* sfpt_done = safepoints_done.pop();
784 // remove any extra entries we added to the safepoint
785 last = sfpt_done->req() - 1;
786 for (int k = 0; k < nfields; k++) {
787 sfpt_done->del_req(last--);
788 }
789 JVMState *jvms = sfpt_done->jvms();
790 jvms->set_endoff(sfpt_done->req());
813 int field_idx = C->get_alias_index(field_addr_type);
814 tty->print(" (alias_idx=%d)", field_idx);
815 } else { // Array's element
816 tty->print("=== At SafePoint node %d can't find value of array element [%d]",
817 sfpt->_idx, j);
818 }
819 tty->print(", which prevents elimination of: ");
820 if (res == NULL)
821 alloc->dump();
822 else
823 res->dump();
824 }
825 #endif
826 return false;
827 }
828 if (UseCompressedOops && field_type->isa_narrowoop()) {
829 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
830 // to be able scalar replace the allocation.
831 if (field_val->is_EncodeP()) {
832 field_val = field_val->in(1);
833 } else {
834 field_val = transform_later(new DecodeNNode(field_val, field_val->get_ptr_type()));
835 }
836 }
837 sfpt->add_req(field_val);
838 }
839 JVMState *jvms = sfpt->jvms();
840 jvms->set_endoff(sfpt->req());
841 // Now make a pass over the debug information replacing any references
842 // to the allocated object with "sobj"
843 int start = jvms->debug_start();
844 int end = jvms->debug_end();
845 sfpt->replace_edges_in_range(res, sobj, start, end, &_igvn);
846 _igvn._worklist.push(sfpt);
847 safepoints_done.append_if_missing(sfpt); // keep it for rollback
848 }
849 return true;
850 }
851
852 static void disconnect_projections(MultiNode* n, PhaseIterGVN& igvn) {
853 Node* ctl_proj = n->proj_out_or_null(TypeFunc::Control);
854 Node* mem_proj = n->proj_out_or_null(TypeFunc::Memory);
855 if (ctl_proj != NULL) {
856 igvn.replace_node(ctl_proj, n->in(0));
857 }
858 if (mem_proj != NULL) {
859 igvn.replace_node(mem_proj, n->in(TypeFunc::Memory));
860 }
861 }
862
863 // Process users of eliminated allocation.
864 void PhaseMacroExpand::process_users_of_allocation(CallNode *alloc) {
865 Node* res = alloc->result_cast();
866 if (res != NULL) {
867 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) {
868 Node *use = res->last_out(j);
869 uint oc1 = res->outcnt();
870
871 if (use->is_AddP()) {
872 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) {
873 Node *n = use->last_out(k);
874 uint oc2 = use->outcnt();
875 if (n->is_Store()) {
876 #ifdef ASSERT
877 // Verify that there is no dependent MemBarVolatile nodes,
878 // they should be removed during IGVN, see MemBarNode::Ideal().
879 for (DUIterator_Fast pmax, p = n->fast_outs(pmax);
880 p < pmax; p++) {
881 Node* mb = n->fast_out(p);
882 assert(mb->is_Initialize() || !mb->is_MemBar() ||
883 mb->req() <= MemBarNode::Precedent ||
884 mb->in(MemBarNode::Precedent) != n,
885 "MemBarVolatile should be eliminated for non-escaping object");
886 }
887 #endif
888 _igvn.replace_node(n, n->in(MemNode::Memory));
889 } else {
890 eliminate_gc_barrier(n);
891 }
892 k -= (oc2 - use->outcnt());
893 }
894 _igvn.remove_dead_node(use);
895 } else if (use->is_ArrayCopy()) {
896 // Disconnect ArrayCopy node
897 ArrayCopyNode* ac = use->as_ArrayCopy();
898 if (ac->is_clonebasic()) {
899 Node* membar_after = ac->proj_out(TypeFunc::Control)->unique_ctrl_out();
900 disconnect_projections(ac, _igvn);
901 assert(alloc->in(TypeFunc::Memory)->is_Proj() && alloc->in(TypeFunc::Memory)->in(0)->Opcode() == Op_MemBarCPUOrder, "mem barrier expected before allocation");
902 Node* membar_before = alloc->in(TypeFunc::Memory)->in(0);
903 disconnect_projections(membar_before->as_MemBar(), _igvn);
904 if (membar_after->is_MemBar()) {
905 disconnect_projections(membar_after->as_MemBar(), _igvn);
906 }
907 } else {
908 assert(ac->is_arraycopy_validated() ||
909 ac->is_copyof_validated() ||
910 ac->is_copyofrange_validated(), "unsupported");
911 CallProjections callprojs;
912 ac->extract_projections(&callprojs, true);
913
914 _igvn.replace_node(callprojs.fallthrough_ioproj, ac->in(TypeFunc::I_O));
915 _igvn.replace_node(callprojs.fallthrough_memproj, ac->in(TypeFunc::Memory));
916 _igvn.replace_node(callprojs.fallthrough_catchproj, ac->in(TypeFunc::Control));
917
918 // Set control to top. IGVN will remove the remaining projections
919 ac->set_req(0, top());
920 ac->replace_edge(res, top(), &_igvn);
921
922 // Disconnect src right away: it can help find new
923 // opportunities for allocation elimination
924 Node* src = ac->in(ArrayCopyNode::Src);
925 ac->replace_edge(src, top(), &_igvn);
926 // src can be top at this point if src and dest of the
927 // arraycopy were the same
928 if (src->outcnt() == 0 && !src->is_top()) {
929 _igvn.remove_dead_node(src);
930 }
931 }
932 _igvn._worklist.push(ac);
933 } else {
934 eliminate_gc_barrier(use);
935 }
936 j -= (oc1 - res->outcnt());
937 }
938 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted");
939 _igvn.remove_dead_node(res);
940 }
941
942 //
943 // Process other users of allocation's projections
944 //
945 if (_callprojs.resproj != NULL && _callprojs.resproj->outcnt() != 0) {
946 // First disconnect stores captured by Initialize node.
947 // If Initialize node is eliminated first in the following code,
948 // it will kill such stores and DUIterator_Last will assert.
949 for (DUIterator_Fast jmax, j = _callprojs.resproj->fast_outs(jmax); j < jmax; j++) {
950 Node* use = _callprojs.resproj->fast_out(j);
951 if (use->is_AddP()) {
952 // raw memory addresses used only by the initialization
953 _igvn.replace_node(use, C->top());
954 --j; --jmax;
955 }
956 }
957 for (DUIterator_Last jmin, j = _callprojs.resproj->last_outs(jmin); j >= jmin; ) {
958 Node* use = _callprojs.resproj->last_out(j);
959 uint oc1 = _callprojs.resproj->outcnt();
960 if (use->is_Initialize()) {
961 // Eliminate Initialize node.
962 InitializeNode *init = use->as_Initialize();
963 assert(init->outcnt() <= 2, "only a control and memory projection expected");
964 Node *ctrl_proj = init->proj_out_or_null(TypeFunc::Control);
965 if (ctrl_proj != NULL) {
966 _igvn.replace_node(ctrl_proj, init->in(TypeFunc::Control));
967 #ifdef ASSERT
968 // If the InitializeNode has no memory out, it will die, and tmp will become NULL
969 Node* tmp = init->in(TypeFunc::Control);
970 assert(tmp == NULL || tmp == _callprojs.fallthrough_catchproj, "allocation control projection");
971 #endif
972 }
973 Node *mem_proj = init->proj_out_or_null(TypeFunc::Memory);
974 if (mem_proj != NULL) {
975 Node *mem = init->in(TypeFunc::Memory);
976 #ifdef ASSERT
977 if (mem->is_MergeMem()) {
978 assert(mem->in(TypeFunc::Memory) == _callprojs.fallthrough_memproj, "allocation memory projection");
979 } else {
980 assert(mem == _callprojs.fallthrough_memproj, "allocation memory projection");
981 }
982 #endif
983 _igvn.replace_node(mem_proj, mem);
984 }
985 } else {
986 assert(false, "only Initialize or AddP expected");
987 }
988 j -= (oc1 - _callprojs.resproj->outcnt());
989 }
990 }
991 if (_callprojs.fallthrough_catchproj != NULL) {
992 _igvn.replace_node(_callprojs.fallthrough_catchproj, alloc->in(TypeFunc::Control));
993 }
994 if (_callprojs.fallthrough_memproj != NULL) {
995 _igvn.replace_node(_callprojs.fallthrough_memproj, alloc->in(TypeFunc::Memory));
996 }
997 if (_callprojs.catchall_memproj != NULL) {
998 _igvn.replace_node(_callprojs.catchall_memproj, C->top());
999 }
1000 if (_callprojs.fallthrough_ioproj != NULL) {
1001 _igvn.replace_node(_callprojs.fallthrough_ioproj, alloc->in(TypeFunc::I_O));
1002 }
1003 if (_callprojs.catchall_ioproj != NULL) {
1004 _igvn.replace_node(_callprojs.catchall_ioproj, C->top());
1005 }
1006 if (_callprojs.catchall_catchproj != NULL) {
1007 _igvn.replace_node(_callprojs.catchall_catchproj, C->top());
1008 }
1009 }
1010
1011 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) {
1012 // If reallocation fails during deoptimization we'll pop all
1013 // interpreter frames for this compiled frame and that won't play
1014 // nice with JVMTI popframe.
1015 // We avoid this issue by eager reallocation when the popframe request
1016 // is received.
1017 if (!EliminateAllocations || !alloc->_is_non_escaping) {
1018 return false;
1019 }
1020 Node* klass = alloc->in(AllocateNode::KlassNode);
1021 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr();
1022 Node* res = alloc->result_cast();
1023 // Eliminate boxing allocations which are not used
1024 // regardless scalar replacable status.
1025 bool boxing_alloc = C->eliminate_boxing() &&
1026 tklass->klass()->is_instance_klass() &&
1027 tklass->klass()->as_instance_klass()->is_box_klass();
1028 if (!alloc->_is_scalar_replaceable && (!boxing_alloc || (res != NULL))) {
1029 return false;
1030 }
1031
1032 alloc->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1033
1034 GrowableArray <SafePointNode *> safepoints;
1035 if (!can_eliminate_allocation(alloc, safepoints)) {
1036 return false;
1037 }
1038
1039 if (!alloc->_is_scalar_replaceable) {
1040 assert(res == NULL, "sanity");
1041 // We can only eliminate allocation if all debug info references
1042 // are already replaced with SafePointScalarObject because
1043 // we can't search for a fields value without instance_id.
1044 if (safepoints.length() > 0) {
1045 return false;
1046 }
1047 }
1048
1049 if (!scalar_replacement(alloc, safepoints)) {
1050 return false;
1051 }
1052
1053 CompileLog* log = C->log();
1054 if (log != NULL) {
1055 log->head("eliminate_allocation type='%d'",
1056 log->identify(tklass->klass()));
1057 JVMState* p = alloc->jvms();
1058 while (p != NULL) {
1059 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1060 p = p->caller();
1061 }
1062 log->tail("eliminate_allocation");
1063 }
1064
1065 process_users_of_allocation(alloc);
1066
1067 #ifndef PRODUCT
1068 if (PrintEliminateAllocations) {
1069 if (alloc->is_AllocateArray())
1070 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1071 else
1072 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1073 }
1074 #endif
1075
1076 return true;
1077 }
1078
1079 bool PhaseMacroExpand::eliminate_boxing_node(CallStaticJavaNode *boxing) {
1080 // EA should remove all uses of non-escaping boxing node.
1081 if (!C->eliminate_boxing() || boxing->proj_out_or_null(TypeFunc::Parms) != NULL) {
1082 return false;
1083 }
1084
1085 assert(boxing->result_cast() == NULL, "unexpected boxing node result");
1086
1087 boxing->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1088
1089 const TypeTuple* r = boxing->tf()->range();
1090 assert(r->cnt() > TypeFunc::Parms, "sanity");
1091 const TypeInstPtr* t = r->field_at(TypeFunc::Parms)->isa_instptr();
1092 assert(t != NULL, "sanity");
1093
1094 CompileLog* log = C->log();
1095 if (log != NULL) {
1096 log->head("eliminate_boxing type='%d'",
1097 log->identify(t->klass()));
1098 JVMState* p = boxing->jvms();
1099 while (p != NULL) {
1100 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1101 p = p->caller();
1102 }
1103 log->tail("eliminate_boxing");
1104 }
1105
1106 process_users_of_allocation(boxing);
1107
1108 #ifndef PRODUCT
1109 if (PrintEliminateAllocations) {
1270 }
1271 }
1272 #endif
1273 yank_alloc_node(alloc);
1274 return;
1275 }
1276 }
1277
1278 enum { too_big_or_final_path = 1, need_gc_path = 2 };
1279 Node *slow_region = NULL;
1280 Node *toobig_false = ctrl;
1281
1282 // generate the initial test if necessary
1283 if (initial_slow_test != NULL ) {
1284 assert (expand_fast_path, "Only need test if there is a fast path");
1285 slow_region = new RegionNode(3);
1286
1287 // Now make the initial failure test. Usually a too-big test but
1288 // might be a TRUE for finalizers or a fancy class check for
1289 // newInstance0.
1290 IfNode *toobig_iff = new IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN);
1291 transform_later(toobig_iff);
1292 // Plug the failing-too-big test into the slow-path region
1293 Node *toobig_true = new IfTrueNode( toobig_iff );
1294 transform_later(toobig_true);
1295 slow_region ->init_req( too_big_or_final_path, toobig_true );
1296 toobig_false = new IfFalseNode( toobig_iff );
1297 transform_later(toobig_false);
1298 } else {
1299 // No initial test, just fall into next case
1300 assert(allocation_has_use || !expand_fast_path, "Should already have been handled");
1301 toobig_false = ctrl;
1302 debug_only(slow_region = NodeSentinel);
1303 }
1304
1305 // If we are here there are several possibilities
1306 // - expand_fast_path is false - then only a slow path is expanded. That's it.
1307 // no_initial_check means a constant allocation.
1308 // - If check always evaluates to false -> expand_fast_path is false (see above)
1309 // - If check always evaluates to true -> directly into fast path (but may bailout to slowpath)
1310 // if !allocation_has_use the fast path is empty
1311 // if !allocation_has_use && no_initial_check
1312 // - Then there are no fastpath that can fall out to slowpath -> no allocation code at all.
1313 // removed by yank_alloc_node above.
1314
1315 Node *slow_mem = mem; // save the current memory state for slow path
1316 // generate the fast allocation code unless we know that the initial test will always go slow
1317 if (expand_fast_path) {
1318 // Fast path modifies only raw memory.
1319 if (mem->is_MergeMem()) {
1320 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
1321 }
1322
1323 // allocate the Region and Phi nodes for the result
1324 result_region = new RegionNode(3);
1325 result_phi_rawmem = new PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM);
1326 result_phi_i_o = new PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch
1327
1328 // Grab regular I/O before optional prefetch may change it.
1329 // Slow-path does no I/O so just set it to the original I/O.
1330 result_phi_i_o->init_req(slow_result_path, i_o);
1331
1332 // Name successful fast-path variables
1333 Node* fast_oop_ctrl;
1334 Node* fast_oop_rawmem;
1335 if (allocation_has_use) {
1336 Node* needgc_ctrl = NULL;
1337 result_phi_rawoop = new PhiNode(result_region, TypeRawPtr::BOTTOM);
1338
1339 intx prefetch_lines = length != NULL ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
1340 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1341 Node* fast_oop = bs->obj_allocate(this, mem, toobig_false, size_in_bytes, i_o, needgc_ctrl,
1342 fast_oop_ctrl, fast_oop_rawmem,
1343 prefetch_lines);
1344
1345 if (initial_slow_test != NULL) {
1346 // This completes all paths into the slow merge point
1347 slow_region->init_req(need_gc_path, needgc_ctrl);
1348 transform_later(slow_region);
1349 } else {
1350 // No initial slow path needed!
1351 // Just fall from the need-GC path straight into the VM call.
1352 slow_region = needgc_ctrl;
1353 }
1354
1372 result_phi_i_o ->init_req(fast_result_path, i_o);
1373 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem);
1374 } else {
1375 slow_region = ctrl;
1376 result_phi_i_o = i_o; // Rename it to use in the following code.
1377 }
1378
1379 // Generate slow-path call
1380 CallNode *call = new CallStaticJavaNode(slow_call_type, slow_call_address,
1381 OptoRuntime::stub_name(slow_call_address),
1382 TypePtr::BOTTOM);
1383 call->init_req(TypeFunc::Control, slow_region);
1384 call->init_req(TypeFunc::I_O, top()); // does no i/o
1385 call->init_req(TypeFunc::Memory, slow_mem); // may gc ptrs
1386 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1387 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1388
1389 call->init_req(TypeFunc::Parms+0, klass_node);
1390 if (length != NULL) {
1391 call->init_req(TypeFunc::Parms+1, length);
1392 }
1393
1394 // Copy debug information and adjust JVMState information, then replace
1395 // allocate node with the call
1396 call->copy_call_debug_info(&_igvn, alloc);
1397 if (expand_fast_path) {
1398 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
1399 } else {
1400 // Hook i_o projection to avoid its elimination during allocation
1401 // replacement (when only a slow call is generated).
1402 call->set_req(TypeFunc::I_O, result_phi_i_o);
1403 }
1404 _igvn.replace_node(alloc, call);
1405 transform_later(call);
1406
1407 // Identify the output projections from the allocate node and
1408 // adjust any references to them.
1409 // The control and io projections look like:
1410 //
1411 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl)
1412 // Allocate Catch
1413 // ^---Proj(io) <-------+ ^---CatchProj(io)
1414 //
1415 // We are interested in the CatchProj nodes.
1416 //
1417 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1418
1419 // An allocate node has separate memory projections for the uses on
1420 // the control and i_o paths. Replace the control memory projection with
1421 // result_phi_rawmem (unless we are only generating a slow call when
1422 // both memory projections are combined)
1423 if (expand_fast_path && _callprojs.fallthrough_memproj != NULL) {
1424 migrate_outs(_callprojs.fallthrough_memproj, result_phi_rawmem);
1425 }
1426 // Now change uses of catchall_memproj to use fallthrough_memproj and delete
1427 // catchall_memproj so we end up with a call that has only 1 memory projection.
1428 if (_callprojs.catchall_memproj != NULL ) {
1429 if (_callprojs.fallthrough_memproj == NULL) {
1430 _callprojs.fallthrough_memproj = new ProjNode(call, TypeFunc::Memory);
1431 transform_later(_callprojs.fallthrough_memproj);
1432 }
1433 migrate_outs(_callprojs.catchall_memproj, _callprojs.fallthrough_memproj);
1434 _igvn.remove_dead_node(_callprojs.catchall_memproj);
1435 }
1436
1437 // An allocate node has separate i_o projections for the uses on the control
1438 // and i_o paths. Always replace the control i_o projection with result i_o
1439 // otherwise incoming i_o become dead when only a slow call is generated
1440 // (it is different from memory projections where both projections are
1441 // combined in such case).
1442 if (_callprojs.fallthrough_ioproj != NULL) {
1443 migrate_outs(_callprojs.fallthrough_ioproj, result_phi_i_o);
1444 }
1445 // Now change uses of catchall_ioproj to use fallthrough_ioproj and delete
1446 // catchall_ioproj so we end up with a call that has only 1 i_o projection.
1447 if (_callprojs.catchall_ioproj != NULL ) {
1448 if (_callprojs.fallthrough_ioproj == NULL) {
1449 _callprojs.fallthrough_ioproj = new ProjNode(call, TypeFunc::I_O);
1450 transform_later(_callprojs.fallthrough_ioproj);
1451 }
1452 migrate_outs(_callprojs.catchall_ioproj, _callprojs.fallthrough_ioproj);
1453 _igvn.remove_dead_node(_callprojs.catchall_ioproj);
1454 }
1455
1456 // if we generated only a slow call, we are done
1457 if (!expand_fast_path) {
1458 // Now we can unhook i_o.
1459 if (result_phi_i_o->outcnt() > 1) {
1460 call->set_req(TypeFunc::I_O, top());
1461 } else {
1462 assert(result_phi_i_o->unique_ctrl_out() == call, "sanity");
1463 // Case of new array with negative size known during compilation.
1464 // AllocateArrayNode::Ideal() optimization disconnect unreachable
1465 // following code since call to runtime will throw exception.
1466 // As result there will be no users of i_o after the call.
1467 // Leave i_o attached to this call to avoid problems in preceding graph.
1468 }
1469 return;
1470 }
1471
1472 if (_callprojs.fallthrough_catchproj != NULL) {
1473 ctrl = _callprojs.fallthrough_catchproj->clone();
1474 transform_later(ctrl);
1475 _igvn.replace_node(_callprojs.fallthrough_catchproj, result_region);
1476 } else {
1477 ctrl = top();
1478 }
1479 Node *slow_result;
1480 if (_callprojs.resproj == NULL) {
1481 // no uses of the allocation result
1482 slow_result = top();
1483 } else {
1484 slow_result = _callprojs.resproj->clone();
1485 transform_later(slow_result);
1486 _igvn.replace_node(_callprojs.resproj, result_phi_rawoop);
1487 }
1488
1489 // Plug slow-path into result merge point
1490 result_region->init_req( slow_result_path, ctrl);
1491 transform_later(result_region);
1492 if (allocation_has_use) {
1493 result_phi_rawoop->init_req(slow_result_path, slow_result);
1494 transform_later(result_phi_rawoop);
1495 }
1496 result_phi_rawmem->init_req(slow_result_path, _callprojs.fallthrough_memproj);
1497 transform_later(result_phi_rawmem);
1498 transform_later(result_phi_i_o);
1499 // This completes all paths into the result merge point
1500 }
1501
1502 // Remove alloc node that has no uses.
1503 void PhaseMacroExpand::yank_alloc_node(AllocateNode* alloc) {
1504 Node* ctrl = alloc->in(TypeFunc::Control);
1505 Node* mem = alloc->in(TypeFunc::Memory);
1506 Node* i_o = alloc->in(TypeFunc::I_O);
1507
1508 alloc->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
1509 if (_callprojs.resproj != NULL) {
1510 for (DUIterator_Fast imax, i = _callprojs.resproj->fast_outs(imax); i < imax; i++) {
1511 Node* use = _callprojs.resproj->fast_out(i);
1512 use->isa_MemBar()->remove(&_igvn);
1513 --imax;
1514 --i; // back up iterator
1515 }
1516 assert(_callprojs.resproj->outcnt() == 0, "all uses must be deleted");
1517 _igvn.remove_dead_node(_callprojs.resproj);
1518 }
1519 if (_callprojs.fallthrough_catchproj != NULL) {
1520 migrate_outs(_callprojs.fallthrough_catchproj, ctrl);
1521 _igvn.remove_dead_node(_callprojs.fallthrough_catchproj);
1522 }
1523 if (_callprojs.catchall_catchproj != NULL) {
1524 _igvn.rehash_node_delayed(_callprojs.catchall_catchproj);
1525 _callprojs.catchall_catchproj->set_req(0, top());
1526 }
1527 if (_callprojs.fallthrough_proj != NULL) {
1528 Node* catchnode = _callprojs.fallthrough_proj->unique_ctrl_out();
1529 _igvn.remove_dead_node(catchnode);
1530 _igvn.remove_dead_node(_callprojs.fallthrough_proj);
1531 }
1532 if (_callprojs.fallthrough_memproj != NULL) {
1533 migrate_outs(_callprojs.fallthrough_memproj, mem);
1534 _igvn.remove_dead_node(_callprojs.fallthrough_memproj);
1535 }
1536 if (_callprojs.fallthrough_ioproj != NULL) {
1537 migrate_outs(_callprojs.fallthrough_ioproj, i_o);
1538 _igvn.remove_dead_node(_callprojs.fallthrough_ioproj);
1539 }
1540 if (_callprojs.catchall_memproj != NULL) {
1541 _igvn.rehash_node_delayed(_callprojs.catchall_memproj);
1542 _callprojs.catchall_memproj->set_req(0, top());
1543 }
1544 if (_callprojs.catchall_ioproj != NULL) {
1545 _igvn.rehash_node_delayed(_callprojs.catchall_ioproj);
1546 _callprojs.catchall_ioproj->set_req(0, top());
1547 }
1548 #ifndef PRODUCT
1549 if (PrintEliminateAllocations) {
1550 if (alloc->is_AllocateArray()) {
1551 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1552 } else {
1553 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1554 }
1555 }
1556 #endif
1557 _igvn.remove_dead_node(alloc);
1558 }
1559
1560 void PhaseMacroExpand::expand_initialize_membar(AllocateNode* alloc, InitializeNode* init,
1561 Node*& fast_oop_ctrl, Node*& fast_oop_rawmem) {
1562 // If initialization is performed by an array copy, any required
1563 // MemBarStoreStore was already added. If the object does not
1564 // escape no need for a MemBarStoreStore. If the object does not
1565 // escape in its initializer and memory barrier (MemBarStoreStore or
1566 // stronger) is already added at exit of initializer, also no need
1643 Node* thread = new ThreadLocalNode();
1644 transform_later(thread);
1645
1646 call->init_req(TypeFunc::Parms + 0, thread);
1647 call->init_req(TypeFunc::Parms + 1, oop);
1648 call->init_req(TypeFunc::Control, ctrl);
1649 call->init_req(TypeFunc::I_O , top()); // does no i/o
1650 call->init_req(TypeFunc::Memory , ctrl);
1651 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1652 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1653 transform_later(call);
1654 ctrl = new ProjNode(call, TypeFunc::Control);
1655 transform_later(ctrl);
1656 rawmem = new ProjNode(call, TypeFunc::Memory);
1657 transform_later(rawmem);
1658 }
1659 }
1660
1661 // Helper for PhaseMacroExpand::expand_allocate_common.
1662 // Initializes the newly-allocated storage.
1663 Node*
1664 PhaseMacroExpand::initialize_object(AllocateNode* alloc,
1665 Node* control, Node* rawmem, Node* object,
1666 Node* klass_node, Node* length,
1667 Node* size_in_bytes) {
1668 InitializeNode* init = alloc->initialization();
1669 // Store the klass & mark bits
1670 Node* mark_node = alloc->make_ideal_mark(&_igvn, object, control, rawmem);
1671 if (!mark_node->is_Con()) {
1672 transform_later(mark_node);
1673 }
1674 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, TypeX_X->basic_type());
1675
1676 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
1677 int header_size = alloc->minimum_header_size(); // conservatively small
1678
1679 // Array length
1680 if (length != NULL) { // Arrays need length field
1681 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
1682 // conservatively small header size:
1683 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1684 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass();
1685 if (k->is_array_klass()) // we know the exact header size in most cases:
1686 header_size = Klass::layout_helper_header_size(k->layout_helper());
1687 }
1688
1689 // Clear the object body, if necessary.
1690 if (init == NULL) {
1691 // The init has somehow disappeared; be cautious and clear everything.
1692 //
1693 // This can happen if a node is allocated but an uncommon trap occurs
1694 // immediately. In this case, the Initialize gets associated with the
1695 // trap, and may be placed in a different (outer) loop, if the Allocate
1696 // is in a loop. If (this is rare) the inner loop gets unrolled, then
1697 // there can be two Allocates to one Initialize. The answer in all these
1698 // edge cases is safety first. It is always safe to clear immediately
1699 // within an Allocate, and then (maybe or maybe not) clear some more later.
1700 if (!(UseTLAB && ZeroTLAB)) {
1701 rawmem = ClearArrayNode::clear_memory(control, rawmem, object,
1702 header_size, size_in_bytes,
1703 &_igvn);
1704 }
1705 } else {
1706 if (!init->is_complete()) {
1707 // Try to win by zeroing only what the init does not store.
1708 // We can also try to do some peephole optimizations,
1709 // such as combining some adjacent subword stores.
1710 rawmem = init->complete_stores(control, rawmem, object,
1711 header_size, size_in_bytes, &_igvn);
1712 }
1713 // We have no more use for this link, since the AllocateNode goes away:
1714 init->set_req(InitializeNode::RawAddress, top());
1715 // (If we keep the link, it just confuses the register allocator,
1716 // who thinks he sees a real use of the address by the membar.)
1717 }
1718
1719 return rawmem;
1720 }
1721
2050 } // EliminateNestedLocks
2051
2052 if (alock->is_non_esc_obj()) { // Lock is used for non escaping object
2053 // Look for all locks of this object and mark them and
2054 // corresponding BoxLock nodes as eliminated.
2055 Node* obj = alock->obj_node();
2056 for (uint j = 0; j < obj->outcnt(); j++) {
2057 Node* o = obj->raw_out(j);
2058 if (o->is_AbstractLock() &&
2059 o->as_AbstractLock()->obj_node()->eqv_uncast(obj)) {
2060 alock = o->as_AbstractLock();
2061 Node* box = alock->box_node();
2062 // Replace old box node with new eliminated box for all users
2063 // of the same object and mark related locks as eliminated.
2064 mark_eliminated_box(box, obj);
2065 }
2066 }
2067 }
2068 }
2069
2070 // we have determined that this lock/unlock can be eliminated, we simply
2071 // eliminate the node without expanding it.
2072 //
2073 // Note: The membar's associated with the lock/unlock are currently not
2074 // eliminated. This should be investigated as a future enhancement.
2075 //
2076 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) {
2077
2078 if (!alock->is_eliminated()) {
2079 return false;
2080 }
2081 #ifdef ASSERT
2082 if (!alock->is_coarsened()) {
2083 // Check that new "eliminated" BoxLock node is created.
2084 BoxLockNode* oldbox = alock->box_node()->as_BoxLock();
2085 assert(oldbox->is_eliminated(), "should be done already");
2086 }
2087 #endif
2088
2089 alock->log_lock_optimization(C, "eliminate_lock");
2090
2091 #ifndef PRODUCT
2092 if (PrintEliminateLocks) {
2093 tty->print_cr("++++ Eliminated: %d %s '%s'", alock->_idx, (alock->is_Lock() ? "Lock" : "Unlock"), alock->kind_as_string());
2094 }
2095 #endif
2096
2097 Node* mem = alock->in(TypeFunc::Memory);
2098 Node* ctrl = alock->in(TypeFunc::Control);
2099 guarantee(ctrl != NULL, "missing control projection, cannot replace_node() with NULL");
2100
2101 alock->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2102 // There are 2 projections from the lock. The lock node will
2103 // be deleted when its last use is subsumed below.
2104 assert(alock->outcnt() == 2 &&
2105 _callprojs.fallthrough_proj != NULL &&
2106 _callprojs.fallthrough_memproj != NULL,
2107 "Unexpected projections from Lock/Unlock");
2108
2109 Node* fallthroughproj = _callprojs.fallthrough_proj;
2110 Node* memproj_fallthrough = _callprojs.fallthrough_memproj;
2111
2112 // The memory projection from a lock/unlock is RawMem
2113 // The input to a Lock is merged memory, so extract its RawMem input
2114 // (unless the MergeMem has been optimized away.)
2115 if (alock->is_Lock()) {
2116 // Seach for MemBarAcquireLock node and delete it also.
2117 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar();
2118 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquireLock, "");
2119 Node* ctrlproj = membar->proj_out(TypeFunc::Control);
2120 Node* memproj = membar->proj_out(TypeFunc::Memory);
2121 _igvn.replace_node(ctrlproj, fallthroughproj);
2122 _igvn.replace_node(memproj, memproj_fallthrough);
2123
2124 // Delete FastLock node also if this Lock node is unique user
2125 // (a loop peeling may clone a Lock node).
2126 Node* flock = alock->as_Lock()->fastlock_node();
2127 if (flock->outcnt() == 1) {
2128 assert(flock->unique_out() == alock, "sanity");
2129 _igvn.replace_node(flock, top());
2130 }
2131 }
2132
2133 // Seach for MemBarReleaseLock node and delete it also.
2134 if (alock->is_Unlock() && ctrl->is_Proj() && ctrl->in(0)->is_MemBar()) {
2135 MemBarNode* membar = ctrl->in(0)->as_MemBar();
2156 Node* mem = lock->in(TypeFunc::Memory);
2157 Node* obj = lock->obj_node();
2158 Node* box = lock->box_node();
2159 Node* flock = lock->fastlock_node();
2160
2161 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2162
2163 // Make the merge point
2164 Node *region;
2165 Node *mem_phi;
2166 Node *slow_path;
2167
2168 region = new RegionNode(3);
2169 // create a Phi for the memory state
2170 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2171
2172 // Optimize test; set region slot 2
2173 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0);
2174 mem_phi->init_req(2, mem);
2175
2176 // Make slow path call
2177 CallNode *call = make_slow_call((CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(),
2178 OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path,
2179 obj, box, NULL);
2180
2181 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2182
2183 // Slow path can only throw asynchronous exceptions, which are always
2184 // de-opted. So the compiler thinks the slow-call can never throw an
2185 // exception. If it DOES throw an exception we would need the debug
2186 // info removed first (since if it throws there is no monitor).
2187 assert(_callprojs.fallthrough_ioproj == NULL && _callprojs.catchall_ioproj == NULL &&
2188 _callprojs.catchall_memproj == NULL && _callprojs.catchall_catchproj == NULL, "Unexpected projection from Lock");
2189
2190 // Capture slow path
2191 // disconnect fall-through projection from call and create a new one
2192 // hook up users of fall-through projection to region
2193 Node *slow_ctrl = _callprojs.fallthrough_proj->clone();
2194 transform_later(slow_ctrl);
2195 _igvn.hash_delete(_callprojs.fallthrough_proj);
2196 _callprojs.fallthrough_proj->disconnect_inputs(C);
2197 region->init_req(1, slow_ctrl);
2198 // region inputs are now complete
2199 transform_later(region);
2200 _igvn.replace_node(_callprojs.fallthrough_proj, region);
2201
2202 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2203 mem_phi->init_req(1, memproj );
2204 transform_later(mem_phi);
2205 _igvn.replace_node(_callprojs.fallthrough_memproj, mem_phi);
2206 }
2207
2208 //------------------------------expand_unlock_node----------------------
2209 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {
2210
2211 Node* ctrl = unlock->in(TypeFunc::Control);
2212 Node* mem = unlock->in(TypeFunc::Memory);
2213 Node* obj = unlock->obj_node();
2214 Node* box = unlock->box_node();
2215
2216 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2217
2218 // No need for a null check on unlock
2219
2220 // Make the merge point
2221 Node *region;
2222 Node *mem_phi;
2223
2224 region = new RegionNode(3);
2225 // create a Phi for the memory state
2226 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2227
2228 FastUnlockNode *funlock = new FastUnlockNode( ctrl, obj, box );
2229 funlock = transform_later( funlock )->as_FastUnlock();
2230 // Optimize test; set region slot 2
2231 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0);
2232 Node *thread = transform_later(new ThreadLocalNode());
2233
2234 CallNode *call = make_slow_call((CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(),
2235 CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C),
2236 "complete_monitor_unlocking_C", slow_path, obj, box, thread);
2237
2238 call->extract_projections(&_callprojs, false /*separate_io_proj*/, false /*do_asserts*/);
2239 assert(_callprojs.fallthrough_ioproj == NULL && _callprojs.catchall_ioproj == NULL &&
2240 _callprojs.catchall_memproj == NULL && _callprojs.catchall_catchproj == NULL, "Unexpected projection from Lock");
2241
2242 // No exceptions for unlocking
2243 // Capture slow path
2244 // disconnect fall-through projection from call and create a new one
2245 // hook up users of fall-through projection to region
2246 Node *slow_ctrl = _callprojs.fallthrough_proj->clone();
2247 transform_later(slow_ctrl);
2248 _igvn.hash_delete(_callprojs.fallthrough_proj);
2249 _callprojs.fallthrough_proj->disconnect_inputs(C);
2250 region->init_req(1, slow_ctrl);
2251 // region inputs are now complete
2252 transform_later(region);
2253 _igvn.replace_node(_callprojs.fallthrough_proj, region);
2254
2255 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory) );
2256 mem_phi->init_req(1, memproj );
2257 mem_phi->init_req(2, mem);
2258 transform_later(mem_phi);
2259 _igvn.replace_node(_callprojs.fallthrough_memproj, mem_phi);
2260 }
2261
2262 void PhaseMacroExpand::expand_subtypecheck_node(SubTypeCheckNode *check) {
2263 assert(check->in(SubTypeCheckNode::Control) == NULL, "should be pinned");
2264 Node* bol = check->unique_out();
2265 Node* obj_or_subklass = check->in(SubTypeCheckNode::ObjOrSubKlass);
2266 Node* superklass = check->in(SubTypeCheckNode::SuperKlass);
2267 assert(bol->is_Bool() && bol->as_Bool()->_test._test == BoolTest::ne, "unexpected bool node");
2268
2269 for (DUIterator_Last imin, i = bol->last_outs(imin); i >= imin; --i) {
2270 Node* iff = bol->last_out(i);
2271 assert(iff->is_If(), "where's the if?");
2272
2273 if (iff->in(0)->is_top()) {
2274 _igvn.replace_input_of(iff, 1, C->top());
2275 continue;
2276 }
2277
2278 Node* iftrue = iff->as_If()->proj_out(1);
2279 Node* iffalse = iff->as_If()->proj_out(0);
2280 Node* ctrl = iff->in(0);
2281
2282 Node* subklass = NULL;
2283 if (_igvn.type(obj_or_subklass)->isa_klassptr()) {
2284 subklass = obj_or_subklass;
2285 } else {
2286 Node* k_adr = basic_plus_adr(obj_or_subklass, oopDesc::klass_offset_in_bytes());
2287 subklass = _igvn.transform(LoadKlassNode::make(_igvn, NULL, C->immutable_memory(), k_adr, TypeInstPtr::KLASS));
2288 }
2289
2290 Node* not_subtype_ctrl = Phase::gen_subtype_check(subklass, superklass, &ctrl, NULL, _igvn);
2291
2292 _igvn.replace_input_of(iff, 0, C->top());
2293 _igvn.replace_node(iftrue, not_subtype_ctrl);
2294 _igvn.replace_node(iffalse, ctrl);
2295 }
2296 _igvn.replace_node(check, C->top());
2297 }
2298
2299 //---------------------------eliminate_macro_nodes----------------------
2300 // Eliminate scalar replaced allocations and associated locks.
2301 void PhaseMacroExpand::eliminate_macro_nodes() {
2302 if (C->macro_count() == 0)
2303 return;
2304
2305 // Before elimination may re-mark (change to Nested or NonEscObj)
2306 // all associated (same box and obj) lock and unlock nodes.
2307 int cnt = C->macro_count();
2308 for (int i=0; i < cnt; i++) {
2309 Node *n = C->macro_node(i);
2310 if (n->is_AbstractLock()) { // Lock and Unlock nodes
2311 mark_eliminated_locking_nodes(n->as_AbstractLock());
2312 }
2313 }
2314 // Re-marking may break consistency of Coarsened locks.
2315 if (!C->coarsened_locks_consistent()) {
2316 return; // recompile without Coarsened locks if broken
2317 }
2318
2328 success = eliminate_locking_node(n->as_AbstractLock());
2329 }
2330 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2331 progress = progress || success;
2332 }
2333 }
2334 // Next, attempt to eliminate allocations
2335 _has_locks = false;
2336 progress = true;
2337 while (progress) {
2338 progress = false;
2339 for (int i = C->macro_count(); i > 0; i = MIN2(i - 1, C->macro_count())) { // more than 1 element can be eliminated at once
2340 Node* n = C->macro_node(i - 1);
2341 bool success = false;
2342 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2343 switch (n->class_id()) {
2344 case Node::Class_Allocate:
2345 case Node::Class_AllocateArray:
2346 success = eliminate_allocate_node(n->as_Allocate());
2347 break;
2348 case Node::Class_CallStaticJava:
2349 success = eliminate_boxing_node(n->as_CallStaticJava());
2350 break;
2351 case Node::Class_Lock:
2352 case Node::Class_Unlock:
2353 assert(!n->as_AbstractLock()->is_eliminated(), "sanity");
2354 _has_locks = true;
2355 break;
2356 case Node::Class_ArrayCopy:
2357 break;
2358 case Node::Class_OuterStripMinedLoop:
2359 break;
2360 case Node::Class_SubTypeCheck:
2361 break;
2362 case Node::Class_Opaque1:
2363 break;
2364 default:
2365 assert(n->Opcode() == Op_LoopLimit ||
2366 n->Opcode() == Op_Opaque2 ||
2367 n->Opcode() == Op_Opaque3 ||
2368 BarrierSet::barrier_set()->barrier_set_c2()->is_gc_barrier_node(n),
2369 "unknown node type in macro list");
2370 }
2371 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2372 progress = progress || success;
2373 }
2374 }
2375 }
2376
2377 //------------------------------expand_macro_nodes----------------------
2378 // Returns true if a failure occurred.
2379 bool PhaseMacroExpand::expand_macro_nodes() {
2380 // Last attempt to eliminate macro nodes.
2381 eliminate_macro_nodes();
2382 if (C->failing()) return true;
2383
2384 // Eliminate Opaque and LoopLimit nodes. Do it after all loop optimizations.
2385 bool progress = true;
2386 while (progress) {
2387 progress = false;
2388 for (int i = C->macro_count(); i > 0; i--) {
2389 Node* n = C->macro_node(i-1);
2390 bool success = false;
2391 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2392 if (n->Opcode() == Op_LoopLimit) {
2393 // Remove it from macro list and put on IGVN worklist to optimize.
2394 C->remove_macro_node(n);
2395 _igvn._worklist.push(n);
2396 success = true;
2397 } else if (n->Opcode() == Op_CallStaticJava) {
2398 // Remove it from macro list and put on IGVN worklist to optimize.
2399 C->remove_macro_node(n);
2400 _igvn._worklist.push(n);
2401 success = true;
2402 } else if (n->is_Opaque1() || n->Opcode() == Op_Opaque2) {
2403 _igvn.replace_node(n, n->in(1));
2404 success = true;
2405 #if INCLUDE_RTM_OPT
2406 } else if ((n->Opcode() == Op_Opaque3) && ((Opaque3Node*)n)->rtm_opt()) {
2407 assert(C->profile_rtm(), "should be used only in rtm deoptimization code");
2408 assert((n->outcnt() == 1) && n->unique_out()->is_Cmp(), "");
2409 Node* cmp = n->unique_out();
2410 #ifdef ASSERT
2411 // Validate graph.
2412 assert((cmp->outcnt() == 1) && cmp->unique_out()->is_Bool(), "");
2413 BoolNode* bol = cmp->unique_out()->as_Bool();
2414 assert((bol->outcnt() == 1) && bol->unique_out()->is_If() &&
2415 (bol->_test._test == BoolTest::ne), "");
2416 IfNode* ifn = bol->unique_out()->as_If();
2417 assert((ifn->outcnt() == 2) &&
2418 ifn->proj_out(1)->is_uncommon_trap_proj(Deoptimization::Reason_rtm_state_change) != NULL, "");
2419 #endif
2420 Node* repl = n->in(1);
2421 if (!_has_locks) {
2471 // Worst case is a macro node gets expanded into about 200 nodes.
2472 // Allow 50% more for optimization.
2473 if (C->check_node_count(300, "out of nodes before macro expansion")) {
2474 return true;
2475 }
2476
2477 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2478 switch (n->class_id()) {
2479 case Node::Class_Lock:
2480 expand_lock_node(n->as_Lock());
2481 break;
2482 case Node::Class_Unlock:
2483 expand_unlock_node(n->as_Unlock());
2484 break;
2485 case Node::Class_ArrayCopy:
2486 expand_arraycopy_node(n->as_ArrayCopy());
2487 break;
2488 case Node::Class_SubTypeCheck:
2489 expand_subtypecheck_node(n->as_SubTypeCheck());
2490 break;
2491 default:
2492 assert(false, "unknown node type in macro list");
2493 }
2494 assert(C->macro_count() == (old_macro_count - 1), "expansion must have deleted one node from macro list");
2495 if (C->failing()) return true;
2496
2497 // Clean up the graph so we're less likely to hit the maximum node
2498 // limit
2499 _igvn.set_delay_transform(false);
2500 _igvn.optimize();
2501 if (C->failing()) return true;
2502 _igvn.set_delay_transform(true);
2503 }
2504
2505 // All nodes except Allocate nodes are expanded now. There could be
2506 // new optimization opportunities (such as folding newly created
2507 // load from a just allocated object). Run IGVN.
2508
2509 // expand "macro" nodes
2510 // 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/sharedRuntime.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "utilities/macros.hpp"
59 #include "utilities/powerOfTwo.hpp"
60 #if INCLUDE_G1GC
61 #include "gc/g1/g1ThreadLocalData.hpp"
62 #endif // INCLUDE_G1GC
63 #if INCLUDE_SHENANDOAHGC
64 #include "gc/shenandoah/c2/shenandoahBarrierSetC2.hpp"
65 #endif
66
67
68 //
69 // Replace any references to "oldref" in inputs to "use" with "newref".
70 // Returns the number of replacements made.
71 //
72 int PhaseMacroExpand::replace_input(Node *use, Node *oldref, Node *newref) {
73 int nreplacements = 0;
74 uint req = use->req();
75 for (uint j = 0; j < use->len(); j++) {
76 Node *uin = use->in(j);
77 if (uin == oldref) {
78 if (j < req)
79 use->set_req(j, newref);
80 else
81 use->set_prec(j, newref);
82 nreplacements++;
83 } else if (j >= req && uin == NULL) {
84 break;
85 }
86 }
87 return nreplacements;
88 }
89
90 Node* PhaseMacroExpand::opt_bits_test(Node* ctrl, Node* region, int edge, Node* word, int mask, int bits, bool return_fast_path) {
91 Node* cmp;
92 if (mask != 0) {
93 Node* and_node = transform_later(new AndXNode(word, MakeConX(mask)));
94 cmp = transform_later(new CmpXNode(and_node, MakeConX(bits)));
95 } else {
96 cmp = word;
97 }
98 Node* bol = transform_later(new BoolNode(cmp, BoolTest::ne));
99 IfNode* iff = new IfNode( ctrl, bol, PROB_MIN, COUNT_UNKNOWN );
100 transform_later(iff);
101
102 // Fast path taken.
103 Node *fast_taken = transform_later(new IfFalseNode(iff));
104
105 // Fast path not-taken, i.e. slow path
106 Node *slow_taken = transform_later(new IfTrueNode(iff));
107
108 if (return_fast_path) {
109 region->init_req(edge, slow_taken); // Capture slow-control
132 // Slow-path call
133 CallNode *call = leaf_name
134 ? (CallNode*)new CallLeafNode ( slow_call_type, slow_call, leaf_name, TypeRawPtr::BOTTOM )
135 : (CallNode*)new CallStaticJavaNode( slow_call_type, slow_call, OptoRuntime::stub_name(slow_call), TypeRawPtr::BOTTOM );
136
137 // Slow path call has no side-effects, uses few values
138 copy_predefined_input_for_runtime_call(slow_path, oldcall, call );
139 if (parm0 != NULL) call->init_req(TypeFunc::Parms+0, parm0);
140 if (parm1 != NULL) call->init_req(TypeFunc::Parms+1, parm1);
141 if (parm2 != NULL) call->init_req(TypeFunc::Parms+2, parm2);
142 call->copy_call_debug_info(&_igvn, oldcall);
143 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
144 _igvn.replace_node(oldcall, call);
145 transform_later(call);
146
147 return call;
148 }
149
150 void PhaseMacroExpand::eliminate_gc_barrier(Node* p2x) {
151 BarrierSetC2 *bs = BarrierSet::barrier_set()->barrier_set_c2();
152 bs->eliminate_gc_barrier(&_igvn, p2x);
153 }
154
155 // Search for a memory operation for the specified memory slice.
156 static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_mem, Node *alloc, PhaseGVN *phase) {
157 Node *orig_mem = mem;
158 Node *alloc_mem = alloc->in(TypeFunc::Memory);
159 const TypeOopPtr *tinst = phase->C->get_adr_type(alias_idx)->isa_oopptr();
160 while (true) {
161 if (mem == alloc_mem || mem == start_mem ) {
162 return mem; // hit one of our sentinels
163 } else if (mem->is_MergeMem()) {
164 mem = mem->as_MergeMem()->memory_at(alias_idx);
165 } else if (mem->is_Proj() && mem->as_Proj()->_con == TypeFunc::Memory) {
166 Node *in = mem->in(0);
167 // we can safely skip over safepoints, calls, locks and membars because we
168 // already know that the object is safe to eliminate.
169 if (in->is_Initialize() && in->as_Initialize()->allocation() == alloc) {
170 return in;
171 } else if (in->is_Call()) {
172 CallNode *call = in->as_Call();
181 ArrayCopyNode* ac = NULL;
182 if (ArrayCopyNode::may_modify(tinst, in->as_MemBar(), phase, ac)) {
183 if (ac != NULL) {
184 assert(ac->is_clonebasic(), "Only basic clone is a non escaping clone");
185 return ac;
186 }
187 }
188 mem = in->in(TypeFunc::Memory);
189 } else {
190 #ifdef ASSERT
191 in->dump();
192 mem->dump();
193 assert(false, "unexpected projection");
194 #endif
195 }
196 } else if (mem->is_Store()) {
197 const TypePtr* atype = mem->as_Store()->adr_type();
198 int adr_idx = phase->C->get_alias_index(atype);
199 if (adr_idx == alias_idx) {
200 assert(atype->isa_oopptr(), "address type must be oopptr");
201 int adr_offset = atype->flattened_offset();
202 uint adr_iid = atype->is_oopptr()->instance_id();
203 // Array elements references have the same alias_idx
204 // but different offset and different instance_id.
205 if (adr_offset == offset && adr_iid == alloc->_idx) {
206 return mem;
207 }
208 } else {
209 assert(adr_idx == Compile::AliasIdxRaw, "address must match or be raw");
210 }
211 mem = mem->in(MemNode::Memory);
212 } else if (mem->is_ClearArray()) {
213 if (!ClearArrayNode::step_through(&mem, alloc->_idx, phase)) {
214 // Can not bypass initialization of the instance
215 // we are looking.
216 debug_only(intptr_t offset;)
217 assert(alloc == AllocateNode::Ideal_allocation(mem->in(3), phase, offset), "sanity");
218 InitializeNode* init = alloc->as_Allocate()->initialization();
219 // We are looking for stored value, return Initialize node
220 // or memory edge from Allocate node.
221 if (init != NULL) {
226 }
227 // Otherwise skip it (the call updated 'mem' value).
228 } else if (mem->Opcode() == Op_SCMemProj) {
229 mem = mem->in(0);
230 Node* adr = NULL;
231 if (mem->is_LoadStore()) {
232 adr = mem->in(MemNode::Address);
233 } else {
234 assert(mem->Opcode() == Op_EncodeISOArray ||
235 mem->Opcode() == Op_StrCompressedCopy, "sanity");
236 adr = mem->in(3); // Destination array
237 }
238 const TypePtr* atype = adr->bottom_type()->is_ptr();
239 int adr_idx = phase->C->get_alias_index(atype);
240 if (adr_idx == alias_idx) {
241 DEBUG_ONLY(mem->dump();)
242 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
243 return NULL;
244 }
245 mem = mem->in(MemNode::Memory);
246 } else if (mem->Opcode() == Op_StrInflatedCopy) {
247 Node* adr = mem->in(3); // Destination array
248 const TypePtr* atype = adr->bottom_type()->is_ptr();
249 int adr_idx = phase->C->get_alias_index(atype);
250 if (adr_idx == alias_idx) {
251 DEBUG_ONLY(mem->dump();)
252 assert(false, "Object is not scalar replaceable if a StrInflatedCopy node accesses its field");
253 return NULL;
254 }
255 mem = mem->in(MemNode::Memory);
256 } else {
257 return mem;
258 }
259 assert(mem != orig_mem, "dead memory loop");
260 }
261 }
262
263 // Generate loads from source of the arraycopy for fields of
264 // destination needed at a deoptimization point
265 Node* PhaseMacroExpand::make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, Node* mem, BasicType ft, const Type *ftype, AllocateNode *alloc) {
266 BasicType bt = ft;
271 }
272 Node* res = NULL;
273 if (ac->is_clonebasic()) {
274 assert(ac->in(ArrayCopyNode::Src) != ac->in(ArrayCopyNode::Dest), "clone source equals destination");
275 Node* base = ac->in(ArrayCopyNode::Src);
276 Node* adr = _igvn.transform(new AddPNode(base, base, MakeConX(offset)));
277 const TypePtr* adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
278 MergeMemNode* mergemen = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
279 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
280 res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemen, adr, adr_type, type, bt);
281 } else {
282 if (ac->modifies(offset, offset, &_igvn, true)) {
283 assert(ac->in(ArrayCopyNode::Dest) == alloc->result_cast(), "arraycopy destination should be allocation's result");
284 uint shift = exact_log2(type2aelembytes(bt));
285 Node* src_pos = ac->in(ArrayCopyNode::SrcPos);
286 Node* dest_pos = ac->in(ArrayCopyNode::DestPos);
287 const TypeInt* src_pos_t = _igvn.type(src_pos)->is_int();
288 const TypeInt* dest_pos_t = _igvn.type(dest_pos)->is_int();
289
290 Node* adr = NULL;
291 Node* base = ac->in(ArrayCopyNode::Src);
292 const TypePtr* adr_type = _igvn.type(base)->is_ptr();
293 assert(adr_type->isa_aryptr(), "only arrays here");
294 if (adr_type->is_aryptr()->is_flat()) {
295 ciFlatArrayKlass* vak = adr_type->is_aryptr()->klass()->as_flat_array_klass();
296 shift = vak->log2_element_size();
297 }
298 if (src_pos_t->is_con() && dest_pos_t->is_con()) {
299 intptr_t off = ((src_pos_t->get_con() - dest_pos_t->get_con()) << shift) + offset;
300 adr = _igvn.transform(new AddPNode(base, base, MakeConX(off)));
301 adr_type = _igvn.type(adr)->is_ptr();
302 assert(adr_type == _igvn.type(base)->is_aryptr()->add_field_offset_and_offset(off), "incorrect address type");
303 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
304 // Don't emit a new load from src if src == dst but try to get the value from memory instead
305 return value_from_mem(ac->in(TypeFunc::Memory), ctl, ft, ftype, adr_type->isa_oopptr(), alloc);
306 }
307 } else {
308 if (ac->in(ArrayCopyNode::Src) == ac->in(ArrayCopyNode::Dest)) {
309 // Non constant offset in the array: we can't statically
310 // determine the value
311 return NULL;
312 }
313 Node* diff = _igvn.transform(new SubINode(ac->in(ArrayCopyNode::SrcPos), ac->in(ArrayCopyNode::DestPos)));
314 #ifdef _LP64
315 diff = _igvn.transform(new ConvI2LNode(diff));
316 #endif
317 diff = _igvn.transform(new LShiftXNode(diff, intcon(shift)));
318
319 Node* off = _igvn.transform(new AddXNode(MakeConX(offset), diff));
320 adr = _igvn.transform(new AddPNode(base, base, off));
321 // In the case of a flattened inline type array, each field has its
322 // own slice so we need to extract the field being accessed from
323 // the address computation
324 adr_type = adr_type->is_aryptr()->add_field_offset_and_offset(offset)->add_offset(Type::OffsetBot);
325 adr = _igvn.transform(new CastPPNode(adr, adr_type));
326 }
327 MergeMemNode* mergemen = _igvn.transform(MergeMemNode::make(mem))->as_MergeMem();
328 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
329 res = ArrayCopyNode::load(bs, &_igvn, ctl, mergemen, adr, adr_type, type, bt);
330 }
331 }
332 if (res != NULL) {
333 if (ftype->isa_narrowoop()) {
334 // PhaseMacroExpand::scalar_replacement adds DecodeN nodes
335 assert(res->isa_DecodeN(), "should be narrow oop");
336 res = _igvn.transform(new EncodePNode(res, ftype));
337 }
338 return res;
339 }
340 return NULL;
341 }
342
343 //
344 // Given a Memory Phi, compute a value Phi containing the values from stores
345 // on the input paths.
346 // Note: this function is recursive, its depth is limited by the "level" argument
347 // Returns the computed Phi, or NULL if it cannot compute it.
348 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) {
349 assert(mem->is_Phi(), "sanity");
350 int alias_idx = C->get_alias_index(adr_t);
351 int offset = adr_t->flattened_offset();
352 int instance_id = adr_t->instance_id();
353
354 // Check if an appropriate value phi already exists.
355 Node* region = mem->in(0);
356 for (DUIterator_Fast kmax, k = region->fast_outs(kmax); k < kmax; k++) {
357 Node* phi = region->fast_out(k);
358 if (phi->is_Phi() && phi != mem &&
359 phi->as_Phi()->is_same_inst_field(phi_type, (int)mem->_idx, instance_id, alias_idx, offset)) {
360 return phi;
361 }
362 }
363 // Check if an appropriate new value phi already exists.
364 Node* new_phi = value_phis->find(mem->_idx);
365 if (new_phi != NULL)
366 return new_phi;
367
368 if (level <= 0) {
369 return NULL; // Give up: phi tree too deep
370 }
371 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
372 Node *alloc_mem = alloc->in(TypeFunc::Memory);
373
374 uint length = mem->req();
375 GrowableArray <Node *> values(length, length, NULL);
376
377 // create a new Phi for the value
378 PhiNode *phi = new PhiNode(mem->in(0), phi_type, NULL, mem->_idx, instance_id, alias_idx, offset);
379 transform_later(phi);
380 value_phis->push(phi, mem->_idx);
381
382 for (uint j = 1; j < length; j++) {
383 Node *in = mem->in(j);
384 if (in == NULL || in->is_top()) {
385 values.at_put(j, in);
386 } else {
387 Node *val = scan_mem_chain(in, alias_idx, offset, start_mem, alloc, &_igvn);
388 if (val == start_mem || val == alloc_mem) {
389 // hit a sentinel, return appropriate 0 value
390 Node* default_value = alloc->in(AllocateNode::DefaultValue);
391 if (default_value != NULL) {
392 values.at_put(j, default_value);
393 } else {
394 assert(alloc->in(AllocateNode::RawDefaultValue) == NULL, "default value may not be null");
395 values.at_put(j, _igvn.zerocon(ft));
396 }
397 continue;
398 }
399 if (val->is_Initialize()) {
400 val = val->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
401 }
402 if (val == NULL) {
403 return NULL; // can't find a value on this path
404 }
405 if (val == mem) {
406 values.at_put(j, mem);
407 } else if (val->is_Store()) {
408 Node* n = val->in(MemNode::ValueIn);
409 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
410 n = bs->step_over_gc_barrier(n);
411 if (is_subword_type(ft)) {
412 n = Compile::narrow_value(ft, n, phi_type, &_igvn, true);
413 }
414 values.at_put(j, n);
415 } else if(val->is_Proj() && val->in(0) == alloc) {
416 Node* default_value = alloc->in(AllocateNode::DefaultValue);
417 if (default_value != NULL) {
418 values.at_put(j, default_value);
419 } else {
420 assert(alloc->in(AllocateNode::RawDefaultValue) == NULL, "default value may not be null");
421 values.at_put(j, _igvn.zerocon(ft));
422 }
423 } else if (val->is_Phi()) {
424 val = value_from_mem_phi(val, ft, phi_type, adr_t, alloc, value_phis, level-1);
425 if (val == NULL) {
426 return NULL;
427 }
428 values.at_put(j, val);
429 } else if (val->Opcode() == Op_SCMemProj) {
430 assert(val->in(0)->is_LoadStore() ||
431 val->in(0)->Opcode() == Op_EncodeISOArray ||
432 val->in(0)->Opcode() == Op_StrCompressedCopy, "sanity");
433 assert(false, "Object is not scalar replaceable if a LoadStore node accesses its field");
434 return NULL;
435 } else if (val->is_ArrayCopy()) {
436 Node* res = make_arraycopy_load(val->as_ArrayCopy(), offset, val->in(0), val->in(TypeFunc::Memory), ft, phi_type, alloc);
437 if (res == NULL) {
438 return NULL;
439 }
440 values.at_put(j, res);
441 } else {
442 DEBUG_ONLY( val->dump(); )
446 }
447 }
448 // Set Phi's inputs
449 for (uint j = 1; j < length; j++) {
450 if (values.at(j) == mem) {
451 phi->init_req(j, phi);
452 } else {
453 phi->init_req(j, values.at(j));
454 }
455 }
456 return phi;
457 }
458
459 // Search the last value stored into the object's field.
460 Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, Node *sfpt_ctl, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, AllocateNode *alloc) {
461 assert(adr_t->is_known_instance_field(), "instance required");
462 int instance_id = adr_t->instance_id();
463 assert((uint)instance_id == alloc->_idx, "wrong allocation");
464
465 int alias_idx = C->get_alias_index(adr_t);
466 int offset = adr_t->flattened_offset();
467 Node *start_mem = C->start()->proj_out_or_null(TypeFunc::Memory);
468 Node *alloc_mem = alloc->in(TypeFunc::Memory);
469 VectorSet visited;
470
471 bool done = sfpt_mem == alloc_mem;
472 Node *mem = sfpt_mem;
473 while (!done) {
474 if (visited.test_set(mem->_idx)) {
475 return NULL; // found a loop, give up
476 }
477 mem = scan_mem_chain(mem, alias_idx, offset, start_mem, alloc, &_igvn);
478 if (mem == start_mem || mem == alloc_mem) {
479 done = true; // hit a sentinel, return appropriate 0 value
480 } else if (mem->is_Initialize()) {
481 mem = mem->as_Initialize()->find_captured_store(offset, type2aelembytes(ft), &_igvn);
482 if (mem == NULL) {
483 done = true; // Something went wrong.
484 } else if (mem->is_Store()) {
485 const TypePtr* atype = mem->as_Store()->adr_type();
486 assert(C->get_alias_index(atype) == Compile::AliasIdxRaw, "store is correct memory slice");
487 done = true;
488 }
489 } else if (mem->is_Store()) {
490 const TypeOopPtr* atype = mem->as_Store()->adr_type()->isa_oopptr();
491 assert(atype != NULL, "address type must be oopptr");
492 assert(C->get_alias_index(atype) == alias_idx &&
493 atype->is_known_instance_field() && atype->flattened_offset() == offset &&
494 atype->instance_id() == instance_id, "store is correct memory slice");
495 done = true;
496 } else if (mem->is_Phi()) {
497 // try to find a phi's unique input
498 Node *unique_input = NULL;
499 Node *top = C->top();
500 for (uint i = 1; i < mem->req(); i++) {
501 Node *n = scan_mem_chain(mem->in(i), alias_idx, offset, start_mem, alloc, &_igvn);
502 if (n == NULL || n == top || n == mem) {
503 continue;
504 } else if (unique_input == NULL) {
505 unique_input = n;
506 } else if (unique_input != n) {
507 unique_input = top;
508 break;
509 }
510 }
511 if (unique_input != NULL && unique_input != top) {
512 mem = unique_input;
513 } else {
514 done = true;
515 }
516 } else if (mem->is_ArrayCopy()) {
517 done = true;
518 } else {
519 DEBUG_ONLY( mem->dump(); )
520 assert(false, "unexpected node");
521 }
522 }
523 if (mem != NULL) {
524 if (mem == start_mem || mem == alloc_mem) {
525 // hit a sentinel, return appropriate 0 value
526 Node* default_value = alloc->in(AllocateNode::DefaultValue);
527 if (default_value != NULL) {
528 return default_value;
529 }
530 assert(alloc->in(AllocateNode::RawDefaultValue) == NULL, "default value may not be null");
531 return _igvn.zerocon(ft);
532 } else if (mem->is_Store()) {
533 Node* n = mem->in(MemNode::ValueIn);
534 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
535 n = bs->step_over_gc_barrier(n);
536 return n;
537 } else if (mem->is_Phi()) {
538 // attempt to produce a Phi reflecting the values on the input paths of the Phi
539 Node_Stack value_phis(8);
540 Node* phi = value_from_mem_phi(mem, ft, ftype, adr_t, alloc, &value_phis, ValueSearchLimit);
541 if (phi != NULL) {
542 return phi;
543 } else {
544 // Kill all new Phis
545 while(value_phis.is_nonempty()) {
546 Node* n = value_phis.node();
547 _igvn.replace_node(n, C->top());
548 value_phis.pop();
549 }
550 }
551 } else if (mem->is_ArrayCopy()) {
552 Node* ctl = mem->in(0);
553 Node* m = mem->in(TypeFunc::Memory);
554 if (sfpt_ctl->is_Proj() && sfpt_ctl->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) {
555 // pin the loads in the uncommon trap path
556 ctl = sfpt_ctl;
557 m = sfpt_mem;
558 }
559 return make_arraycopy_load(mem->as_ArrayCopy(), offset, ctl, m, ft, ftype, alloc);
560 }
561 }
562 // Something went wrong.
563 return NULL;
564 }
565
566 // Search the last value stored into the inline type's fields.
567 Node* PhaseMacroExpand::inline_type_from_mem(Node* mem, Node* ctl, ciInlineKlass* vk, const TypeAryPtr* adr_type, int offset, AllocateNode* alloc) {
568 // Subtract the offset of the first field to account for the missing oop header
569 offset -= vk->first_field_offset();
570 // Create a new InlineTypeNode and retrieve the field values from memory
571 InlineTypeNode* vt = InlineTypeNode::make_uninitialized(_igvn, vk)->as_InlineType();
572 transform_later(vt);
573 for (int i = 0; i < vk->nof_declared_nonstatic_fields(); ++i) {
574 ciType* field_type = vt->field_type(i);
575 int field_offset = offset + vt->field_offset(i);
576 Node* value = NULL;
577 if (vt->field_is_flattened(i)) {
578 value = inline_type_from_mem(mem, ctl, field_type->as_inline_klass(), adr_type, field_offset, alloc);
579 } else {
580 const Type* ft = Type::get_const_type(field_type);
581 BasicType bt = field_type->basic_type();
582 if (UseCompressedOops && !is_java_primitive(bt)) {
583 ft = ft->make_narrowoop();
584 bt = T_NARROWOOP;
585 }
586 // Each inline type field has its own memory slice
587 adr_type = adr_type->with_field_offset(field_offset);
588 value = value_from_mem(mem, ctl, bt, ft, adr_type, alloc);
589 if (value != NULL && ft->isa_narrowoop()) {
590 assert(UseCompressedOops, "unexpected narrow oop");
591 if (value->is_EncodeP()) {
592 value = value->in(1);
593 } else {
594 value = transform_later(new DecodeNNode(value, value->get_ptr_type()));
595 }
596 }
597 }
598 if (value != NULL) {
599 vt->set_field_value(i, value);
600 } else {
601 // We might have reached the TrackedInitializationLimit
602 return NULL;
603 }
604 }
605 return vt;
606 }
607
608 // Check the possibility of scalar replacement.
609 bool PhaseMacroExpand::can_eliminate_allocation(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
610 // Scan the uses of the allocation to check for anything that would
611 // prevent us from eliminating it.
612 NOT_PRODUCT( const char* fail_eliminate = NULL; )
613 DEBUG_ONLY( Node* disq_node = NULL; )
614 bool can_eliminate = true;
615
616 Unique_Node_List worklist;
617 Node* res = alloc->result_cast();
618 const TypeOopPtr* res_type = NULL;
619 if (res == NULL) {
620 // All users were eliminated.
621 } else if (!res->is_CheckCastPP()) {
622 NOT_PRODUCT(fail_eliminate = "Allocation does not have unique CheckCastPP";)
623 can_eliminate = false;
624 } else {
625 worklist.push(res);
626 res_type = _igvn.type(res)->isa_oopptr();
627 if (res_type == NULL) {
628 NOT_PRODUCT(fail_eliminate = "Neither instance or array allocation";)
629 can_eliminate = false;
630 } else if (res_type->isa_aryptr()) {
631 int length = alloc->in(AllocateNode::ALength)->find_int_con(-1);
632 if (length < 0) {
633 NOT_PRODUCT(fail_eliminate = "Array's size is not constant";)
634 can_eliminate = false;
635 }
636 }
637 }
638
639 while (can_eliminate && worklist.size() > 0) {
640 res = worklist.pop();
641 for (DUIterator_Fast jmax, j = res->fast_outs(jmax); j < jmax && can_eliminate; j++) {
642 Node* use = res->fast_out(j);
643
644 if (use->is_AddP()) {
645 const TypePtr* addp_type = _igvn.type(use)->is_ptr();
646 int offset = addp_type->offset();
647
648 if (offset == Type::OffsetTop || offset == Type::OffsetBot) {
649 NOT_PRODUCT(fail_eliminate = "Undefined field reference";)
650 can_eliminate = false;
651 break;
652 }
653 for (DUIterator_Fast kmax, k = use->fast_outs(kmax);
654 k < kmax && can_eliminate; k++) {
655 Node* n = use->fast_out(k);
656 if (!n->is_Store() && n->Opcode() != Op_CastP2X
657 SHENANDOAHGC_ONLY(&& (!UseShenandoahGC || !ShenandoahBarrierSetC2::is_shenandoah_wb_pre_call(n))) ) {
658 DEBUG_ONLY(disq_node = n;)
659 if (n->is_Load() || n->is_LoadStore()) {
660 NOT_PRODUCT(fail_eliminate = "Field load";)
661 } else {
662 NOT_PRODUCT(fail_eliminate = "Not store field reference";)
663 }
664 can_eliminate = false;
665 }
666 }
667 } else if (use->is_ArrayCopy() &&
668 (use->as_ArrayCopy()->is_clonebasic() ||
669 use->as_ArrayCopy()->is_arraycopy_validated() ||
670 use->as_ArrayCopy()->is_copyof_validated() ||
671 use->as_ArrayCopy()->is_copyofrange_validated()) &&
672 use->in(ArrayCopyNode::Dest) == res) {
673 // ok to eliminate
674 } else if (use->is_SafePoint()) {
675 SafePointNode* sfpt = use->as_SafePoint();
676 if (sfpt->is_Call() && sfpt->as_Call()->has_non_debug_use(res)) {
677 // Object is passed as argument.
678 DEBUG_ONLY(disq_node = use;)
679 NOT_PRODUCT(fail_eliminate = "Object is passed as argument";)
680 can_eliminate = false;
681 }
682 Node* sfptMem = sfpt->memory();
683 if (sfptMem == NULL || sfptMem->is_top()) {
684 DEBUG_ONLY(disq_node = use;)
685 NOT_PRODUCT(fail_eliminate = "NULL or TOP memory";)
686 can_eliminate = false;
687 } else {
688 safepoints.append_if_missing(sfpt);
689 }
690 } else if (use->is_InlineType() && use->isa_InlineType()->get_oop() == res) {
691 // ok to eliminate
692 } else if (use->is_InlineTypePtr() && use->isa_InlineTypePtr()->get_oop() == res) {
693 // Process users
694 worklist.push(use);
695 } else if (use->Opcode() == Op_StoreX && use->in(MemNode::Address) == res) {
696 // Store to mark word of inline type larval buffer
697 assert(res_type->is_inlinetypeptr(), "Unexpected store to mark word");
698 } else if (use->Opcode() != Op_CastP2X) { // CastP2X is used by card mark
699 if (use->is_Phi()) {
700 if (use->outcnt() == 1 && use->unique_out()->Opcode() == Op_Return) {
701 NOT_PRODUCT(fail_eliminate = "Object is return value";)
702 } else {
703 NOT_PRODUCT(fail_eliminate = "Object is referenced by Phi";)
704 }
705 DEBUG_ONLY(disq_node = use;)
706 } else {
707 if (use->Opcode() == Op_Return) {
708 NOT_PRODUCT(fail_eliminate = "Object is return value";)
709 } else {
710 NOT_PRODUCT(fail_eliminate = "Object is referenced by node";)
711 }
712 DEBUG_ONLY(disq_node = use;)
713 }
714 can_eliminate = false;
715 } else {
716 assert(use->Opcode() == Op_CastP2X, "should be");
717 assert(!use->has_out_with(Op_OrL), "should have been removed because oop is never null");
718 }
719 }
720 }
721
722 #ifndef PRODUCT
723 if (PrintEliminateAllocations) {
724 if (can_eliminate) {
725 tty->print("Scalar ");
726 if (res == NULL)
727 alloc->dump();
728 else
729 res->dump();
730 } else {
731 tty->print("NotScalar (%s)", fail_eliminate);
732 if (res == NULL)
733 alloc->dump();
734 else
735 res->dump();
736 #ifdef ASSERT
737 if (disq_node != NULL) {
738 tty->print(" >>>> ");
739 disq_node->dump();
740 }
741 #endif /*ASSERT*/
742 }
743 }
744 #endif
745 return can_eliminate;
746 }
747
748 // Do scalar replacement.
749 bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <SafePointNode *>& safepoints) {
750 GrowableArray <SafePointNode *> safepoints_done;
760 Node* res = alloc->result_cast();
761 assert(res == NULL || res->is_CheckCastPP(), "unexpected AllocateNode result");
762 const TypeOopPtr* res_type = NULL;
763 if (res != NULL) { // Could be NULL when there are no users
764 res_type = _igvn.type(res)->isa_oopptr();
765 }
766
767 if (res != NULL) {
768 klass = res_type->klass();
769 if (res_type->isa_instptr()) {
770 // find the fields of the class which will be needed for safepoint debug information
771 assert(klass->is_instance_klass(), "must be an instance klass.");
772 iklass = klass->as_instance_klass();
773 nfields = iklass->nof_nonstatic_fields();
774 } else {
775 // find the array's elements which will be needed for safepoint debug information
776 nfields = alloc->in(AllocateNode::ALength)->find_int_con(-1);
777 assert(klass->is_array_klass() && nfields >= 0, "must be an array klass.");
778 elem_type = klass->as_array_klass()->element_type();
779 basic_elem_type = elem_type->basic_type();
780 if (elem_type->is_inlinetype() && !klass->is_flat_array_klass()) {
781 assert(basic_elem_type == T_INLINE_TYPE, "unexpected element basic type");
782 basic_elem_type = T_OBJECT;
783 }
784 array_base = arrayOopDesc::base_offset_in_bytes(basic_elem_type);
785 element_size = type2aelembytes(basic_elem_type);
786 if (klass->is_flat_array_klass()) {
787 // Flattened inline type array
788 element_size = klass->as_flat_array_klass()->element_byte_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 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 } else {
825 offset = array_base + j * (intptr_t)element_size;
826 }
827
828 const Type *field_type;
829 // The next code is taken from Parse::do_get_xxx().
830 if (is_reference_type(basic_elem_type)) {
831 if (!elem_type->is_loaded()) {
832 field_type = TypeInstPtr::BOTTOM;
833 } else if (field != NULL && field->is_static_constant()) {
834 // This can happen if the constant oop is non-perm.
835 ciObject* con = field->constant_value().as_object();
836 // Do not "join" in the previous type; it doesn't add value,
837 // and may yield a vacuous result if the field is of interface type.
838 field_type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
839 assert(field_type != NULL, "field singleton type must be consistent");
840 } else {
841 field_type = TypeOopPtr::make_from_klass(elem_type->as_klass());
842 }
843 if (UseCompressedOops) {
844 field_type = field_type->make_narrowoop();
845 basic_elem_type = T_NARROWOOP;
846 }
847 } else {
848 field_type = Type::get_const_basic_type(basic_elem_type);
849 }
850
851 Node* field_val = NULL;
852 const TypeOopPtr* field_addr_type = res_type->add_offset(offset)->isa_oopptr();
853 if (klass->is_flat_array_klass()) {
854 ciInlineKlass* vk = elem_type->as_inline_klass();
855 assert(vk->flatten_array(), "must be flattened");
856 field_val = inline_type_from_mem(mem, ctl, vk, field_addr_type->isa_aryptr(), 0, alloc);
857 } else {
858 field_val = value_from_mem(mem, ctl, basic_elem_type, field_type, field_addr_type, alloc);
859 }
860 if (field_val == NULL) {
861 // We weren't able to find a value for this field,
862 // give up on eliminating this allocation.
863
864 // Remove any extra entries we added to the safepoint.
865 uint last = sfpt->req() - 1;
866 for (int k = 0; k < j; k++) {
867 sfpt->del_req(last--);
868 }
869 _igvn._worklist.push(sfpt);
870 // rollback processed safepoints
871 while (safepoints_done.length() > 0) {
872 SafePointNode* sfpt_done = safepoints_done.pop();
873 // remove any extra entries we added to the safepoint
874 last = sfpt_done->req() - 1;
875 for (int k = 0; k < nfields; k++) {
876 sfpt_done->del_req(last--);
877 }
878 JVMState *jvms = sfpt_done->jvms();
879 jvms->set_endoff(sfpt_done->req());
902 int field_idx = C->get_alias_index(field_addr_type);
903 tty->print(" (alias_idx=%d)", field_idx);
904 } else { // Array's element
905 tty->print("=== At SafePoint node %d can't find value of array element [%d]",
906 sfpt->_idx, j);
907 }
908 tty->print(", which prevents elimination of: ");
909 if (res == NULL)
910 alloc->dump();
911 else
912 res->dump();
913 }
914 #endif
915 return false;
916 }
917 if (UseCompressedOops && field_type->isa_narrowoop()) {
918 // Enable "DecodeN(EncodeP(Allocate)) --> Allocate" transformation
919 // to be able scalar replace the allocation.
920 if (field_val->is_EncodeP()) {
921 field_val = field_val->in(1);
922 } else if (!field_val->is_InlineTypeBase()) {
923 field_val = transform_later(new DecodeNNode(field_val, field_val->get_ptr_type()));
924 }
925 }
926 if (field_val->is_InlineTypeBase()) {
927 // Keep track of inline types to scalarize them later
928 value_worklist.push(field_val);
929 }
930 sfpt->add_req(field_val);
931 }
932 JVMState *jvms = sfpt->jvms();
933 jvms->set_endoff(sfpt->req());
934 // Now make a pass over the debug information replacing any references
935 // to the allocated object with "sobj"
936 int start = jvms->debug_start();
937 int end = jvms->debug_end();
938 sfpt->replace_edges_in_range(res, sobj, start, end, &_igvn);
939 _igvn._worklist.push(sfpt);
940 safepoints_done.append_if_missing(sfpt); // keep it for rollback
941 }
942 // Scalarize inline types that were added to the safepoint.
943 // Don't allow linking a constant oop (if available) for flat array elements
944 // because Deoptimization::reassign_flat_array_elements needs field values.
945 bool allow_oop = (klass == NULL) || !klass->is_flat_array_klass();
946 for (uint i = 0; i < value_worklist.size(); ++i) {
947 InlineTypeBaseNode* vt = value_worklist.at(i)->as_InlineTypeBase();
948 vt->make_scalar_in_safepoints(&_igvn, allow_oop);
949 }
950 return true;
951 }
952
953 static void disconnect_projections(MultiNode* n, PhaseIterGVN& igvn) {
954 Node* ctl_proj = n->proj_out_or_null(TypeFunc::Control);
955 Node* mem_proj = n->proj_out_or_null(TypeFunc::Memory);
956 if (ctl_proj != NULL) {
957 igvn.replace_node(ctl_proj, n->in(0));
958 }
959 if (mem_proj != NULL) {
960 igvn.replace_node(mem_proj, n->in(TypeFunc::Memory));
961 }
962 }
963
964 // Process users of eliminated allocation.
965 void PhaseMacroExpand::process_users_of_allocation(CallNode *alloc, bool inline_alloc) {
966 Unique_Node_List worklist;
967 Node* res = alloc->result_cast();
968 if (res != NULL) {
969 worklist.push(res);
970 }
971 while (worklist.size() > 0) {
972 res = worklist.pop();
973 for (DUIterator_Last jmin, j = res->last_outs(jmin); j >= jmin; ) {
974 Node *use = res->last_out(j);
975 uint oc1 = res->outcnt();
976
977 if (use->is_AddP()) {
978 for (DUIterator_Last kmin, k = use->last_outs(kmin); k >= kmin; ) {
979 Node *n = use->last_out(k);
980 uint oc2 = use->outcnt();
981 if (n->is_Store()) {
982 for (DUIterator_Fast pmax, p = n->fast_outs(pmax); p < pmax; p++) {
983 MemBarNode* mb = n->fast_out(p)->isa_MemBar();
984 if (mb != NULL && mb->req() <= MemBarNode::Precedent && mb->in(MemBarNode::Precedent) == n) {
985 // MemBarVolatiles should have been removed by MemBarNode::Ideal() for non-inline allocations
986 assert(inline_alloc, "MemBarVolatile should be eliminated for non-escaping object");
987 mb->remove(&_igvn);
988 }
989 }
990 _igvn.replace_node(n, n->in(MemNode::Memory));
991 } else {
992 eliminate_gc_barrier(n);
993 }
994 k -= (oc2 - use->outcnt());
995 }
996 _igvn.remove_dead_node(use);
997 } else if (use->is_ArrayCopy()) {
998 // Disconnect ArrayCopy node
999 ArrayCopyNode* ac = use->as_ArrayCopy();
1000 if (ac->is_clonebasic()) {
1001 Node* membar_after = ac->proj_out(TypeFunc::Control)->unique_ctrl_out();
1002 disconnect_projections(ac, _igvn);
1003 assert(alloc->in(TypeFunc::Memory)->is_Proj() && alloc->in(TypeFunc::Memory)->in(0)->Opcode() == Op_MemBarCPUOrder, "mem barrier expected before allocation");
1004 Node* membar_before = alloc->in(TypeFunc::Memory)->in(0);
1005 disconnect_projections(membar_before->as_MemBar(), _igvn);
1006 if (membar_after->is_MemBar()) {
1007 disconnect_projections(membar_after->as_MemBar(), _igvn);
1008 }
1009 } else {
1010 assert(ac->is_arraycopy_validated() ||
1011 ac->is_copyof_validated() ||
1012 ac->is_copyofrange_validated(), "unsupported");
1013 CallProjections* callprojs = ac->extract_projections(true);
1014
1015 _igvn.replace_node(callprojs->fallthrough_ioproj, ac->in(TypeFunc::I_O));
1016 _igvn.replace_node(callprojs->fallthrough_memproj, ac->in(TypeFunc::Memory));
1017 _igvn.replace_node(callprojs->fallthrough_catchproj, ac->in(TypeFunc::Control));
1018
1019 // Set control to top. IGVN will remove the remaining projections
1020 ac->set_req(0, top());
1021 ac->replace_edge(res, top(), &_igvn);
1022
1023 // Disconnect src right away: it can help find new
1024 // opportunities for allocation elimination
1025 Node* src = ac->in(ArrayCopyNode::Src);
1026 ac->replace_edge(src, top(), &_igvn);
1027 // src can be top at this point if src and dest of the
1028 // arraycopy were the same
1029 if (src->outcnt() == 0 && !src->is_top()) {
1030 _igvn.remove_dead_node(src);
1031 }
1032 }
1033 _igvn._worklist.push(ac);
1034 } else if (use->is_InlineType()) {
1035 assert(use->isa_InlineType()->get_oop() == res, "unexpected inline type use");
1036 _igvn.rehash_node_delayed(use);
1037 use->isa_InlineType()->set_oop(_igvn.zerocon(T_INLINE_TYPE));
1038 } else if (use->is_InlineTypePtr()) {
1039 assert(use->isa_InlineTypePtr()->get_oop() == res, "unexpected inline type ptr use");
1040 _igvn.rehash_node_delayed(use);
1041 use->isa_InlineTypePtr()->set_oop(_igvn.zerocon(T_INLINE_TYPE));
1042 // Process users
1043 worklist.push(use);
1044 } else if (use->Opcode() == Op_StoreX && use->in(MemNode::Address) == res) {
1045 // Store to mark word of inline type larval buffer
1046 assert(inline_alloc, "Unexpected store to mark word");
1047 _igvn.replace_node(use, use->in(MemNode::Memory));
1048 } else {
1049 eliminate_gc_barrier(use);
1050 }
1051 j -= (oc1 - res->outcnt());
1052 }
1053 assert(res->outcnt() == 0, "all uses of allocated objects must be deleted");
1054 _igvn.remove_dead_node(res);
1055 }
1056
1057 //
1058 // Process other users of allocation's projections
1059 //
1060 if (_callprojs->resproj[0] != NULL && _callprojs->resproj[0]->outcnt() != 0) {
1061 // First disconnect stores captured by Initialize node.
1062 // If Initialize node is eliminated first in the following code,
1063 // it will kill such stores and DUIterator_Last will assert.
1064 for (DUIterator_Fast jmax, j = _callprojs->resproj[0]->fast_outs(jmax); j < jmax; j++) {
1065 Node* use = _callprojs->resproj[0]->fast_out(j);
1066 if (use->is_AddP()) {
1067 // raw memory addresses used only by the initialization
1068 _igvn.replace_node(use, C->top());
1069 --j; --jmax;
1070 }
1071 }
1072 for (DUIterator_Last jmin, j = _callprojs->resproj[0]->last_outs(jmin); j >= jmin; ) {
1073 Node* use = _callprojs->resproj[0]->last_out(j);
1074 uint oc1 = _callprojs->resproj[0]->outcnt();
1075 if (use->is_Initialize()) {
1076 // Eliminate Initialize node.
1077 InitializeNode *init = use->as_Initialize();
1078 assert(init->outcnt() <= 2, "only a control and memory projection expected");
1079 Node *ctrl_proj = init->proj_out_or_null(TypeFunc::Control);
1080 if (ctrl_proj != NULL) {
1081 _igvn.replace_node(ctrl_proj, init->in(TypeFunc::Control));
1082 #ifdef ASSERT
1083 // If the InitializeNode has no memory out, it will die, and tmp will become NULL
1084 Node* tmp = init->in(TypeFunc::Control);
1085 assert(tmp == NULL || tmp == _callprojs->fallthrough_catchproj, "allocation control projection");
1086 #endif
1087 }
1088 Node *mem_proj = init->proj_out_or_null(TypeFunc::Memory);
1089 if (mem_proj != NULL) {
1090 Node *mem = init->in(TypeFunc::Memory);
1091 #ifdef ASSERT
1092 if (mem->is_MergeMem()) {
1093 assert(mem->in(TypeFunc::Memory) == _callprojs->fallthrough_memproj, "allocation memory projection");
1094 } else {
1095 assert(mem == _callprojs->fallthrough_memproj, "allocation memory projection");
1096 }
1097 #endif
1098 _igvn.replace_node(mem_proj, mem);
1099 }
1100 } else if (use->Opcode() == Op_MemBarStoreStore) {
1101 // Inline type buffer allocations are followed by a membar
1102 assert(inline_alloc, "Unexpected MemBarStoreStore");
1103 use->as_MemBar()->remove(&_igvn);
1104 } else {
1105 assert(false, "only Initialize or AddP expected");
1106 }
1107 j -= (oc1 - _callprojs->resproj[0]->outcnt());
1108 }
1109 }
1110 if (_callprojs->fallthrough_catchproj != NULL) {
1111 _igvn.replace_node(_callprojs->fallthrough_catchproj, alloc->in(TypeFunc::Control));
1112 }
1113 if (_callprojs->fallthrough_memproj != NULL) {
1114 _igvn.replace_node(_callprojs->fallthrough_memproj, alloc->in(TypeFunc::Memory));
1115 }
1116 if (_callprojs->catchall_memproj != NULL) {
1117 _igvn.replace_node(_callprojs->catchall_memproj, C->top());
1118 }
1119 if (_callprojs->fallthrough_ioproj != NULL) {
1120 _igvn.replace_node(_callprojs->fallthrough_ioproj, alloc->in(TypeFunc::I_O));
1121 }
1122 if (_callprojs->catchall_ioproj != NULL) {
1123 _igvn.replace_node(_callprojs->catchall_ioproj, C->top());
1124 }
1125 if (_callprojs->catchall_catchproj != NULL) {
1126 _igvn.replace_node(_callprojs->catchall_catchproj, C->top());
1127 }
1128 }
1129
1130 bool PhaseMacroExpand::eliminate_allocate_node(AllocateNode *alloc) {
1131 // If reallocation fails during deoptimization we'll pop all
1132 // interpreter frames for this compiled frame and that won't play
1133 // nice with JVMTI popframe.
1134 // We avoid this issue by eager reallocation when the popframe request
1135 // is received.
1136 if (!EliminateAllocations) {
1137 return false;
1138 }
1139 Node* klass = alloc->in(AllocateNode::KlassNode);
1140 const TypeKlassPtr* tklass = _igvn.type(klass)->is_klassptr();
1141
1142 // Attempt to eliminate inline type buffer allocations
1143 // regardless of usage and escape/replaceable status.
1144 bool inline_alloc = tklass->klass()->is_inlinetype();
1145 if (!alloc->_is_non_escaping && !inline_alloc) {
1146 return false;
1147 }
1148 // Eliminate boxing allocations which are not used
1149 // regardless of scalar replaceable status.
1150 Node* res = alloc->result_cast();
1151 bool boxing_alloc = (res == NULL) && C->eliminate_boxing() &&
1152 tklass->klass()->is_instance_klass() &&
1153 tklass->klass()->as_instance_klass()->is_box_klass();
1154 if (!alloc->_is_scalar_replaceable && !boxing_alloc && !inline_alloc) {
1155 return false;
1156 }
1157
1158 _callprojs = alloc->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1159
1160 GrowableArray <SafePointNode *> safepoints;
1161 if (!can_eliminate_allocation(alloc, safepoints)) {
1162 return false;
1163 }
1164
1165 if (!alloc->_is_scalar_replaceable) {
1166 assert(res == NULL || inline_alloc, "sanity");
1167 // We can only eliminate allocation if all debug info references
1168 // are already replaced with SafePointScalarObject because
1169 // we can't search for a fields value without instance_id.
1170 if (safepoints.length() > 0) {
1171 assert(!inline_alloc, "Inline type allocations should not have safepoint uses");
1172 return false;
1173 }
1174 }
1175
1176 if (!scalar_replacement(alloc, safepoints)) {
1177 return false;
1178 }
1179
1180 CompileLog* log = C->log();
1181 if (log != NULL) {
1182 log->head("eliminate_allocation type='%d'",
1183 log->identify(tklass->klass()));
1184 JVMState* p = alloc->jvms();
1185 while (p != NULL) {
1186 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1187 p = p->caller();
1188 }
1189 log->tail("eliminate_allocation");
1190 }
1191
1192 process_users_of_allocation(alloc, inline_alloc);
1193
1194 #ifndef PRODUCT
1195 if (PrintEliminateAllocations) {
1196 if (alloc->is_AllocateArray())
1197 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1198 else
1199 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1200 }
1201 #endif
1202
1203 return true;
1204 }
1205
1206 bool PhaseMacroExpand::eliminate_boxing_node(CallStaticJavaNode *boxing) {
1207 // EA should remove all uses of non-escaping boxing node.
1208 if (!C->eliminate_boxing() || boxing->proj_out_or_null(TypeFunc::Parms) != NULL) {
1209 return false;
1210 }
1211
1212 assert(boxing->result_cast() == NULL, "unexpected boxing node result");
1213
1214 _callprojs = boxing->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1215
1216 const TypeTuple* r = boxing->tf()->range_sig();
1217 assert(r->cnt() > TypeFunc::Parms, "sanity");
1218 const TypeInstPtr* t = r->field_at(TypeFunc::Parms)->isa_instptr();
1219 assert(t != NULL, "sanity");
1220
1221 CompileLog* log = C->log();
1222 if (log != NULL) {
1223 log->head("eliminate_boxing type='%d'",
1224 log->identify(t->klass()));
1225 JVMState* p = boxing->jvms();
1226 while (p != NULL) {
1227 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1228 p = p->caller();
1229 }
1230 log->tail("eliminate_boxing");
1231 }
1232
1233 process_users_of_allocation(boxing);
1234
1235 #ifndef PRODUCT
1236 if (PrintEliminateAllocations) {
1397 }
1398 }
1399 #endif
1400 yank_alloc_node(alloc);
1401 return;
1402 }
1403 }
1404
1405 enum { too_big_or_final_path = 1, need_gc_path = 2 };
1406 Node *slow_region = NULL;
1407 Node *toobig_false = ctrl;
1408
1409 // generate the initial test if necessary
1410 if (initial_slow_test != NULL ) {
1411 assert (expand_fast_path, "Only need test if there is a fast path");
1412 slow_region = new RegionNode(3);
1413
1414 // Now make the initial failure test. Usually a too-big test but
1415 // might be a TRUE for finalizers or a fancy class check for
1416 // newInstance0.
1417 IfNode* toobig_iff = new IfNode(ctrl, initial_slow_test, PROB_MIN, COUNT_UNKNOWN);
1418 transform_later(toobig_iff);
1419 // Plug the failing-too-big test into the slow-path region
1420 Node* toobig_true = new IfTrueNode(toobig_iff);
1421 transform_later(toobig_true);
1422 slow_region ->init_req( too_big_or_final_path, toobig_true );
1423 toobig_false = new IfFalseNode(toobig_iff);
1424 transform_later(toobig_false);
1425 } else {
1426 // No initial test, just fall into next case
1427 assert(allocation_has_use || !expand_fast_path, "Should already have been handled");
1428 toobig_false = ctrl;
1429 debug_only(slow_region = NodeSentinel);
1430 }
1431
1432 // If we are here there are several possibilities
1433 // - expand_fast_path is false - then only a slow path is expanded. That's it.
1434 // no_initial_check means a constant allocation.
1435 // - If check always evaluates to false -> expand_fast_path is false (see above)
1436 // - If check always evaluates to true -> directly into fast path (but may bailout to slowpath)
1437 // if !allocation_has_use the fast path is empty
1438 // if !allocation_has_use && no_initial_check
1439 // - Then there are no fastpath that can fall out to slowpath -> no allocation code at all.
1440 // removed by yank_alloc_node above.
1441
1442 Node *slow_mem = mem; // save the current memory state for slow path
1443 // generate the fast allocation code unless we know that the initial test will always go slow
1444 if (expand_fast_path) {
1445 // Fast path modifies only raw memory.
1446 if (mem->is_MergeMem()) {
1447 mem = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
1448 }
1449
1450 // allocate the Region and Phi nodes for the result
1451 result_region = new RegionNode(3);
1452 result_phi_rawmem = new PhiNode(result_region, Type::MEMORY, TypeRawPtr::BOTTOM);
1453 result_phi_i_o = new PhiNode(result_region, Type::ABIO); // I/O is used for Prefetch
1454
1455 // Grab regular I/O before optional prefetch may change it.
1456 // Slow-path does no I/O so just set it to the original I/O.
1457 result_phi_i_o->init_req(slow_result_path, i_o);
1458
1459 // Name successful fast-path variables
1460 Node* fast_oop_ctrl;
1461 Node* fast_oop_rawmem;
1462
1463 if (allocation_has_use) {
1464 Node* needgc_ctrl = NULL;
1465 result_phi_rawoop = new PhiNode(result_region, TypeRawPtr::BOTTOM);
1466
1467 intx prefetch_lines = length != NULL ? AllocatePrefetchLines : AllocateInstancePrefetchLines;
1468 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1469 Node* fast_oop = bs->obj_allocate(this, mem, toobig_false, size_in_bytes, i_o, needgc_ctrl,
1470 fast_oop_ctrl, fast_oop_rawmem,
1471 prefetch_lines);
1472
1473 if (initial_slow_test != NULL) {
1474 // This completes all paths into the slow merge point
1475 slow_region->init_req(need_gc_path, needgc_ctrl);
1476 transform_later(slow_region);
1477 } else {
1478 // No initial slow path needed!
1479 // Just fall from the need-GC path straight into the VM call.
1480 slow_region = needgc_ctrl;
1481 }
1482
1500 result_phi_i_o ->init_req(fast_result_path, i_o);
1501 result_phi_rawmem->init_req(fast_result_path, fast_oop_rawmem);
1502 } else {
1503 slow_region = ctrl;
1504 result_phi_i_o = i_o; // Rename it to use in the following code.
1505 }
1506
1507 // Generate slow-path call
1508 CallNode *call = new CallStaticJavaNode(slow_call_type, slow_call_address,
1509 OptoRuntime::stub_name(slow_call_address),
1510 TypePtr::BOTTOM);
1511 call->init_req(TypeFunc::Control, slow_region);
1512 call->init_req(TypeFunc::I_O, top()); // does no i/o
1513 call->init_req(TypeFunc::Memory, slow_mem); // may gc ptrs
1514 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1515 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1516
1517 call->init_req(TypeFunc::Parms+0, klass_node);
1518 if (length != NULL) {
1519 call->init_req(TypeFunc::Parms+1, length);
1520 } else {
1521 // Let the runtime know if this is a larval allocation
1522 call->init_req(TypeFunc::Parms+1, _igvn.intcon(alloc->_larval));
1523 }
1524
1525 // Copy debug information and adjust JVMState information, then replace
1526 // allocate node with the call
1527 call->copy_call_debug_info(&_igvn, alloc);
1528 if (expand_fast_path) {
1529 call->set_cnt(PROB_UNLIKELY_MAG(4)); // Same effect as RC_UNCOMMON.
1530 } else {
1531 // Hook i_o projection to avoid its elimination during allocation
1532 // replacement (when only a slow call is generated).
1533 call->set_req(TypeFunc::I_O, result_phi_i_o);
1534 }
1535 _igvn.replace_node(alloc, call);
1536 transform_later(call);
1537
1538 // Identify the output projections from the allocate node and
1539 // adjust any references to them.
1540 // The control and io projections look like:
1541 //
1542 // v---Proj(ctrl) <-----+ v---CatchProj(ctrl)
1543 // Allocate Catch
1544 // ^---Proj(io) <-------+ ^---CatchProj(io)
1545 //
1546 // We are interested in the CatchProj nodes.
1547 //
1548 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1549
1550 // An allocate node has separate memory projections for the uses on
1551 // the control and i_o paths. Replace the control memory projection with
1552 // result_phi_rawmem (unless we are only generating a slow call when
1553 // both memory projections are combined)
1554 if (expand_fast_path && _callprojs->fallthrough_memproj != NULL) {
1555 _igvn.replace_in_uses(_callprojs->fallthrough_memproj, result_phi_rawmem);
1556 }
1557 // Now change uses of catchall_memproj to use fallthrough_memproj and delete
1558 // catchall_memproj so we end up with a call that has only 1 memory projection.
1559 if (_callprojs->catchall_memproj != NULL) {
1560 if (_callprojs->fallthrough_memproj == NULL) {
1561 _callprojs->fallthrough_memproj = new ProjNode(call, TypeFunc::Memory);
1562 transform_later(_callprojs->fallthrough_memproj);
1563 }
1564 _igvn.replace_in_uses(_callprojs->catchall_memproj, _callprojs->fallthrough_memproj);
1565 _igvn.remove_dead_node(_callprojs->catchall_memproj);
1566 }
1567
1568 // An allocate node has separate i_o projections for the uses on the control
1569 // and i_o paths. Always replace the control i_o projection with result i_o
1570 // otherwise incoming i_o become dead when only a slow call is generated
1571 // (it is different from memory projections where both projections are
1572 // combined in such case).
1573 if (_callprojs->fallthrough_ioproj != NULL) {
1574 _igvn.replace_in_uses(_callprojs->fallthrough_ioproj, result_phi_i_o);
1575 }
1576 // Now change uses of catchall_ioproj to use fallthrough_ioproj and delete
1577 // catchall_ioproj so we end up with a call that has only 1 i_o projection.
1578 if (_callprojs->catchall_ioproj != NULL) {
1579 if (_callprojs->fallthrough_ioproj == NULL) {
1580 _callprojs->fallthrough_ioproj = new ProjNode(call, TypeFunc::I_O);
1581 transform_later(_callprojs->fallthrough_ioproj);
1582 }
1583 _igvn.replace_in_uses(_callprojs->catchall_ioproj, _callprojs->fallthrough_ioproj);
1584 _igvn.remove_dead_node(_callprojs->catchall_ioproj);
1585 }
1586
1587 // if we generated only a slow call, we are done
1588 if (!expand_fast_path) {
1589 // Now we can unhook i_o.
1590 if (result_phi_i_o->outcnt() > 1) {
1591 call->set_req(TypeFunc::I_O, top());
1592 } else {
1593 assert(result_phi_i_o->unique_ctrl_out() == call, "sanity");
1594 // Case of new array with negative size known during compilation.
1595 // AllocateArrayNode::Ideal() optimization disconnect unreachable
1596 // following code since call to runtime will throw exception.
1597 // As result there will be no users of i_o after the call.
1598 // Leave i_o attached to this call to avoid problems in preceding graph.
1599 }
1600 return;
1601 }
1602
1603 if (_callprojs->fallthrough_catchproj != NULL) {
1604 ctrl = _callprojs->fallthrough_catchproj->clone();
1605 transform_later(ctrl);
1606 _igvn.replace_node(_callprojs->fallthrough_catchproj, result_region);
1607 } else {
1608 ctrl = top();
1609 }
1610 Node *slow_result;
1611 if (_callprojs->resproj[0] == NULL) {
1612 // no uses of the allocation result
1613 slow_result = top();
1614 } else {
1615 slow_result = _callprojs->resproj[0]->clone();
1616 transform_later(slow_result);
1617 _igvn.replace_node(_callprojs->resproj[0], result_phi_rawoop);
1618 }
1619
1620 // Plug slow-path into result merge point
1621 result_region->init_req( slow_result_path, ctrl);
1622 transform_later(result_region);
1623 if (allocation_has_use) {
1624 result_phi_rawoop->init_req(slow_result_path, slow_result);
1625 transform_later(result_phi_rawoop);
1626 }
1627 result_phi_rawmem->init_req(slow_result_path, _callprojs->fallthrough_memproj);
1628 transform_later(result_phi_rawmem);
1629 transform_later(result_phi_i_o);
1630 // This completes all paths into the result merge point
1631 }
1632
1633 // Remove alloc node that has no uses.
1634 void PhaseMacroExpand::yank_alloc_node(AllocateNode* alloc) {
1635 Node* ctrl = alloc->in(TypeFunc::Control);
1636 Node* mem = alloc->in(TypeFunc::Memory);
1637 Node* i_o = alloc->in(TypeFunc::I_O);
1638
1639 _callprojs = alloc->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
1640 if (_callprojs->resproj[0] != NULL) {
1641 for (DUIterator_Fast imax, i = _callprojs->resproj[0]->fast_outs(imax); i < imax; i++) {
1642 Node* use = _callprojs->resproj[0]->fast_out(i);
1643 use->isa_MemBar()->remove(&_igvn);
1644 --imax;
1645 --i; // back up iterator
1646 }
1647 assert(_callprojs->resproj[0]->outcnt() == 0, "all uses must be deleted");
1648 _igvn.remove_dead_node(_callprojs->resproj[0]);
1649 }
1650 if (_callprojs->fallthrough_catchproj != NULL) {
1651 _igvn.replace_in_uses(_callprojs->fallthrough_catchproj, ctrl);
1652 _igvn.remove_dead_node(_callprojs->fallthrough_catchproj);
1653 }
1654 if (_callprojs->catchall_catchproj != NULL) {
1655 _igvn.rehash_node_delayed(_callprojs->catchall_catchproj);
1656 _callprojs->catchall_catchproj->set_req(0, top());
1657 }
1658 if (_callprojs->fallthrough_proj != NULL) {
1659 Node* catchnode = _callprojs->fallthrough_proj->unique_ctrl_out();
1660 _igvn.remove_dead_node(catchnode);
1661 _igvn.remove_dead_node(_callprojs->fallthrough_proj);
1662 }
1663 if (_callprojs->fallthrough_memproj != NULL) {
1664 _igvn.replace_in_uses(_callprojs->fallthrough_memproj, mem);
1665 _igvn.remove_dead_node(_callprojs->fallthrough_memproj);
1666 }
1667 if (_callprojs->fallthrough_ioproj != NULL) {
1668 _igvn.replace_in_uses(_callprojs->fallthrough_ioproj, i_o);
1669 _igvn.remove_dead_node(_callprojs->fallthrough_ioproj);
1670 }
1671 if (_callprojs->catchall_memproj != NULL) {
1672 _igvn.rehash_node_delayed(_callprojs->catchall_memproj);
1673 _callprojs->catchall_memproj->set_req(0, top());
1674 }
1675 if (_callprojs->catchall_ioproj != NULL) {
1676 _igvn.rehash_node_delayed(_callprojs->catchall_ioproj);
1677 _callprojs->catchall_ioproj->set_req(0, top());
1678 }
1679 #ifndef PRODUCT
1680 if (PrintEliminateAllocations) {
1681 if (alloc->is_AllocateArray()) {
1682 tty->print_cr("++++ Eliminated: %d AllocateArray", alloc->_idx);
1683 } else {
1684 tty->print_cr("++++ Eliminated: %d Allocate", alloc->_idx);
1685 }
1686 }
1687 #endif
1688 _igvn.remove_dead_node(alloc);
1689 }
1690
1691 void PhaseMacroExpand::expand_initialize_membar(AllocateNode* alloc, InitializeNode* init,
1692 Node*& fast_oop_ctrl, Node*& fast_oop_rawmem) {
1693 // If initialization is performed by an array copy, any required
1694 // MemBarStoreStore was already added. If the object does not
1695 // escape no need for a MemBarStoreStore. If the object does not
1696 // escape in its initializer and memory barrier (MemBarStoreStore or
1697 // stronger) is already added at exit of initializer, also no need
1774 Node* thread = new ThreadLocalNode();
1775 transform_later(thread);
1776
1777 call->init_req(TypeFunc::Parms + 0, thread);
1778 call->init_req(TypeFunc::Parms + 1, oop);
1779 call->init_req(TypeFunc::Control, ctrl);
1780 call->init_req(TypeFunc::I_O , top()); // does no i/o
1781 call->init_req(TypeFunc::Memory , ctrl);
1782 call->init_req(TypeFunc::ReturnAdr, alloc->in(TypeFunc::ReturnAdr));
1783 call->init_req(TypeFunc::FramePtr, alloc->in(TypeFunc::FramePtr));
1784 transform_later(call);
1785 ctrl = new ProjNode(call, TypeFunc::Control);
1786 transform_later(ctrl);
1787 rawmem = new ProjNode(call, TypeFunc::Memory);
1788 transform_later(rawmem);
1789 }
1790 }
1791
1792 // Helper for PhaseMacroExpand::expand_allocate_common.
1793 // Initializes the newly-allocated storage.
1794 Node* PhaseMacroExpand::initialize_object(AllocateNode* alloc,
1795 Node* control, Node* rawmem, Node* object,
1796 Node* klass_node, Node* length,
1797 Node* size_in_bytes) {
1798 InitializeNode* init = alloc->initialization();
1799 // Store the klass & mark bits
1800 Node* mark_node = alloc->make_ideal_mark(&_igvn, control, rawmem);
1801 if (!mark_node->is_Con()) {
1802 transform_later(mark_node);
1803 }
1804 rawmem = make_store(control, rawmem, object, oopDesc::mark_offset_in_bytes(), mark_node, TypeX_X->basic_type());
1805
1806 rawmem = make_store(control, rawmem, object, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
1807 int header_size = alloc->minimum_header_size(); // conservatively small
1808
1809 // Array length
1810 if (length != NULL) { // Arrays need length field
1811 rawmem = make_store(control, rawmem, object, arrayOopDesc::length_offset_in_bytes(), length, T_INT);
1812 // conservatively small header size:
1813 header_size = arrayOopDesc::base_offset_in_bytes(T_BYTE);
1814 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass();
1815 if (k->is_array_klass()) // we know the exact header size in most cases:
1816 header_size = Klass::layout_helper_header_size(k->layout_helper());
1817 }
1818
1819 // Clear the object body, if necessary.
1820 if (init == NULL) {
1821 // The init has somehow disappeared; be cautious and clear everything.
1822 //
1823 // This can happen if a node is allocated but an uncommon trap occurs
1824 // immediately. In this case, the Initialize gets associated with the
1825 // trap, and may be placed in a different (outer) loop, if the Allocate
1826 // is in a loop. If (this is rare) the inner loop gets unrolled, then
1827 // there can be two Allocates to one Initialize. The answer in all these
1828 // edge cases is safety first. It is always safe to clear immediately
1829 // within an Allocate, and then (maybe or maybe not) clear some more later.
1830 if (!(UseTLAB && ZeroTLAB)) {
1831 rawmem = ClearArrayNode::clear_memory(control, rawmem, object,
1832 alloc->in(AllocateNode::DefaultValue),
1833 alloc->in(AllocateNode::RawDefaultValue),
1834 header_size, size_in_bytes,
1835 &_igvn);
1836 }
1837 } else {
1838 if (!init->is_complete()) {
1839 // Try to win by zeroing only what the init does not store.
1840 // We can also try to do some peephole optimizations,
1841 // such as combining some adjacent subword stores.
1842 rawmem = init->complete_stores(control, rawmem, object,
1843 header_size, size_in_bytes, &_igvn);
1844 }
1845 // We have no more use for this link, since the AllocateNode goes away:
1846 init->set_req(InitializeNode::RawAddress, top());
1847 // (If we keep the link, it just confuses the register allocator,
1848 // who thinks he sees a real use of the address by the membar.)
1849 }
1850
1851 return rawmem;
1852 }
1853
2182 } // EliminateNestedLocks
2183
2184 if (alock->is_non_esc_obj()) { // Lock is used for non escaping object
2185 // Look for all locks of this object and mark them and
2186 // corresponding BoxLock nodes as eliminated.
2187 Node* obj = alock->obj_node();
2188 for (uint j = 0; j < obj->outcnt(); j++) {
2189 Node* o = obj->raw_out(j);
2190 if (o->is_AbstractLock() &&
2191 o->as_AbstractLock()->obj_node()->eqv_uncast(obj)) {
2192 alock = o->as_AbstractLock();
2193 Node* box = alock->box_node();
2194 // Replace old box node with new eliminated box for all users
2195 // of the same object and mark related locks as eliminated.
2196 mark_eliminated_box(box, obj);
2197 }
2198 }
2199 }
2200 }
2201
2202 void PhaseMacroExpand::inline_type_guard(Node** ctrl, LockNode* lock) {
2203 Node* obj = lock->obj_node();
2204 const TypePtr* obj_type = _igvn.type(obj)->make_ptr();
2205 if (!obj_type->can_be_inline_type()) {
2206 return;
2207 }
2208 Node* mark = make_load(*ctrl, lock->memory(), obj, oopDesc::mark_offset_in_bytes(), TypeX_X, TypeX_X->basic_type());
2209 Node* value_mask = _igvn.MakeConX(markWord::inline_type_pattern);
2210 Node* is_value = _igvn.transform(new AndXNode(mark, value_mask));
2211 Node* cmp = _igvn.transform(new CmpXNode(is_value, value_mask));
2212 Node* bol = _igvn.transform(new BoolNode(cmp, BoolTest::eq));
2213 Node* unc_ctrl = generate_slow_guard(ctrl, bol, NULL);
2214
2215 int trap_request = Deoptimization::make_trap_request(Deoptimization::Reason_class_check, Deoptimization::Action_none);
2216 address call_addr = SharedRuntime::uncommon_trap_blob()->entry_point();
2217 const TypePtr* no_memory_effects = NULL;
2218 CallNode* unc = new CallStaticJavaNode(OptoRuntime::uncommon_trap_Type(), call_addr, "uncommon_trap",
2219 no_memory_effects);
2220 unc->init_req(TypeFunc::Control, unc_ctrl);
2221 unc->init_req(TypeFunc::I_O, lock->i_o());
2222 unc->init_req(TypeFunc::Memory, lock->memory());
2223 unc->init_req(TypeFunc::FramePtr, lock->in(TypeFunc::FramePtr));
2224 unc->init_req(TypeFunc::ReturnAdr, lock->in(TypeFunc::ReturnAdr));
2225 unc->init_req(TypeFunc::Parms+0, _igvn.intcon(trap_request));
2226 unc->set_cnt(PROB_UNLIKELY_MAG(4));
2227 unc->copy_call_debug_info(&_igvn, lock);
2228
2229 assert(unc->peek_monitor_box() == lock->box_node(), "wrong monitor");
2230 assert((obj_type->is_inlinetypeptr() && unc->peek_monitor_obj()->is_SafePointScalarObject()) ||
2231 (obj->is_InlineTypePtr() && obj->in(1) == unc->peek_monitor_obj()) ||
2232 (obj == unc->peek_monitor_obj()), "wrong monitor");
2233
2234 // pop monitor and push obj back on stack: we trap before the monitorenter
2235 unc->pop_monitor();
2236 unc->grow_stack(unc->jvms(), 1);
2237 unc->set_stack(unc->jvms(), unc->jvms()->stk_size()-1, obj);
2238 _igvn.register_new_node_with_optimizer(unc);
2239
2240 unc_ctrl = _igvn.transform(new ProjNode(unc, TypeFunc::Control));
2241 Node* halt = _igvn.transform(new HaltNode(unc_ctrl, lock->in(TypeFunc::FramePtr), "monitor enter on inline type"));
2242 C->root()->add_req(halt);
2243 }
2244
2245 // we have determined that this lock/unlock can be eliminated, we simply
2246 // eliminate the node without expanding it.
2247 //
2248 // Note: The membar's associated with the lock/unlock are currently not
2249 // eliminated. This should be investigated as a future enhancement.
2250 //
2251 bool PhaseMacroExpand::eliminate_locking_node(AbstractLockNode *alock) {
2252
2253 if (!alock->is_eliminated()) {
2254 return false;
2255 }
2256 #ifdef ASSERT
2257 if (!alock->is_coarsened()) {
2258 // Check that new "eliminated" BoxLock node is created.
2259 BoxLockNode* oldbox = alock->box_node()->as_BoxLock();
2260 assert(oldbox->is_eliminated(), "should be done already");
2261 }
2262 #endif
2263
2264 alock->log_lock_optimization(C, "eliminate_lock");
2265
2266 #ifndef PRODUCT
2267 if (PrintEliminateLocks) {
2268 tty->print_cr("++++ Eliminated: %d %s '%s'", alock->_idx, (alock->is_Lock() ? "Lock" : "Unlock"), alock->kind_as_string());
2269 }
2270 #endif
2271
2272 Node* mem = alock->in(TypeFunc::Memory);
2273 Node* ctrl = alock->in(TypeFunc::Control);
2274 guarantee(ctrl != NULL, "missing control projection, cannot replace_node() with NULL");
2275
2276 _callprojs = alock->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2277 // There are 2 projections from the lock. The lock node will
2278 // be deleted when its last use is subsumed below.
2279 assert(alock->outcnt() == 2 &&
2280 _callprojs->fallthrough_proj != NULL &&
2281 _callprojs->fallthrough_memproj != NULL,
2282 "Unexpected projections from Lock/Unlock");
2283
2284 Node* fallthroughproj = _callprojs->fallthrough_proj;
2285 Node* memproj_fallthrough = _callprojs->fallthrough_memproj;
2286
2287 // The memory projection from a lock/unlock is RawMem
2288 // The input to a Lock is merged memory, so extract its RawMem input
2289 // (unless the MergeMem has been optimized away.)
2290 if (alock->is_Lock()) {
2291 // Deoptimize and re-execute if object is an inline type
2292 inline_type_guard(&ctrl, alock->as_Lock());
2293
2294 // Seach for MemBarAcquireLock node and delete it also.
2295 MemBarNode* membar = fallthroughproj->unique_ctrl_out()->as_MemBar();
2296 assert(membar != NULL && membar->Opcode() == Op_MemBarAcquireLock, "");
2297 Node* ctrlproj = membar->proj_out(TypeFunc::Control);
2298 Node* memproj = membar->proj_out(TypeFunc::Memory);
2299 _igvn.replace_node(ctrlproj, fallthroughproj);
2300 _igvn.replace_node(memproj, memproj_fallthrough);
2301
2302 // Delete FastLock node also if this Lock node is unique user
2303 // (a loop peeling may clone a Lock node).
2304 Node* flock = alock->as_Lock()->fastlock_node();
2305 if (flock->outcnt() == 1) {
2306 assert(flock->unique_out() == alock, "sanity");
2307 _igvn.replace_node(flock, top());
2308 }
2309 }
2310
2311 // Seach for MemBarReleaseLock node and delete it also.
2312 if (alock->is_Unlock() && ctrl->is_Proj() && ctrl->in(0)->is_MemBar()) {
2313 MemBarNode* membar = ctrl->in(0)->as_MemBar();
2334 Node* mem = lock->in(TypeFunc::Memory);
2335 Node* obj = lock->obj_node();
2336 Node* box = lock->box_node();
2337 Node* flock = lock->fastlock_node();
2338
2339 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2340
2341 // Make the merge point
2342 Node *region;
2343 Node *mem_phi;
2344 Node *slow_path;
2345
2346 region = new RegionNode(3);
2347 // create a Phi for the memory state
2348 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2349
2350 // Optimize test; set region slot 2
2351 slow_path = opt_bits_test(ctrl, region, 2, flock, 0, 0);
2352 mem_phi->init_req(2, mem);
2353
2354 // Deoptimize and re-execute if object is an inline type
2355 inline_type_guard(&slow_path, lock);
2356
2357 // Make slow path call
2358 CallNode *call = make_slow_call((CallNode *) lock, OptoRuntime::complete_monitor_enter_Type(),
2359 OptoRuntime::complete_monitor_locking_Java(), NULL, slow_path,
2360 obj, box, NULL);
2361
2362 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2363
2364 // Slow path can only throw asynchronous exceptions, which are always
2365 // de-opted. So the compiler thinks the slow-call can never throw an
2366 // exception. If it DOES throw an exception we would need the debug
2367 // info removed first (since if it throws there is no monitor).
2368 assert(_callprojs->fallthrough_ioproj == NULL && _callprojs->catchall_ioproj == NULL &&
2369 _callprojs->catchall_memproj == NULL && _callprojs->catchall_catchproj == NULL, "Unexpected projection from Lock");
2370
2371 // Capture slow path
2372 // disconnect fall-through projection from call and create a new one
2373 // hook up users of fall-through projection to region
2374 Node *slow_ctrl = _callprojs->fallthrough_proj->clone();
2375 transform_later(slow_ctrl);
2376 _igvn.hash_delete(_callprojs->fallthrough_proj);
2377 _callprojs->fallthrough_proj->disconnect_inputs(C);
2378 region->init_req(1, slow_ctrl);
2379 // region inputs are now complete
2380 transform_later(region);
2381 _igvn.replace_node(_callprojs->fallthrough_proj, region);
2382
2383 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory));
2384 mem_phi->init_req(1, memproj );
2385 transform_later(mem_phi);
2386 _igvn.replace_node(_callprojs->fallthrough_memproj, mem_phi);
2387 }
2388
2389 //------------------------------expand_unlock_node----------------------
2390 void PhaseMacroExpand::expand_unlock_node(UnlockNode *unlock) {
2391
2392 Node* ctrl = unlock->in(TypeFunc::Control);
2393 Node* mem = unlock->in(TypeFunc::Memory);
2394 Node* obj = unlock->obj_node();
2395 Node* box = unlock->box_node();
2396
2397 assert(!box->as_BoxLock()->is_eliminated(), "sanity");
2398
2399 // No need for a null check on unlock
2400
2401 // Make the merge point
2402 Node *region;
2403 Node *mem_phi;
2404
2405 region = new RegionNode(3);
2406 // create a Phi for the memory state
2407 mem_phi = new PhiNode( region, Type::MEMORY, TypeRawPtr::BOTTOM);
2408
2409 FastUnlockNode *funlock = new FastUnlockNode( ctrl, obj, box );
2410 funlock = transform_later( funlock )->as_FastUnlock();
2411 // Optimize test; set region slot 2
2412 Node *slow_path = opt_bits_test(ctrl, region, 2, funlock, 0, 0);
2413 Node *thread = transform_later(new ThreadLocalNode());
2414
2415 CallNode *call = make_slow_call((CallNode *) unlock, OptoRuntime::complete_monitor_exit_Type(),
2416 CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C),
2417 "complete_monitor_unlocking_C", slow_path, obj, box, thread);
2418
2419 _callprojs = call->extract_projections(false /*separate_io_proj*/, false /*do_asserts*/);
2420 assert(_callprojs->fallthrough_ioproj == NULL && _callprojs->catchall_ioproj == NULL &&
2421 _callprojs->catchall_memproj == NULL && _callprojs->catchall_catchproj == NULL, "Unexpected projection from Lock");
2422
2423 // No exceptions for unlocking
2424 // Capture slow path
2425 // disconnect fall-through projection from call and create a new one
2426 // hook up users of fall-through projection to region
2427 Node *slow_ctrl = _callprojs->fallthrough_proj->clone();
2428 transform_later(slow_ctrl);
2429 _igvn.hash_delete(_callprojs->fallthrough_proj);
2430 _callprojs->fallthrough_proj->disconnect_inputs(C);
2431 region->init_req(1, slow_ctrl);
2432 // region inputs are now complete
2433 transform_later(region);
2434 _igvn.replace_node(_callprojs->fallthrough_proj, region);
2435
2436 Node *memproj = transform_later(new ProjNode(call, TypeFunc::Memory) );
2437 mem_phi->init_req(1, memproj );
2438 mem_phi->init_req(2, mem);
2439 transform_later(mem_phi);
2440 _igvn.replace_node(_callprojs->fallthrough_memproj, mem_phi);
2441 }
2442
2443 // An inline type might be returned from the call but we don't know its
2444 // type. Either we get a buffered inline type (and nothing needs to be done)
2445 // or one of the inlines being returned is the klass of the inline type
2446 // and we need to allocate an inline type instance of that type and
2447 // initialize it with other values being returned. In that case, we
2448 // first try a fast path allocation and initialize the value with the
2449 // inline klass's pack handler or we fall back to a runtime call.
2450 void PhaseMacroExpand::expand_mh_intrinsic_return(CallStaticJavaNode* call) {
2451 assert(call->method()->is_method_handle_intrinsic(), "must be a method handle intrinsic call");
2452 Node* ret = call->proj_out_or_null(TypeFunc::Parms);
2453 if (ret == NULL) {
2454 return;
2455 }
2456 const TypeFunc* tf = call->_tf;
2457 const TypeTuple* domain = OptoRuntime::store_inline_type_fields_Type()->domain_cc();
2458 const TypeFunc* new_tf = TypeFunc::make(tf->domain_sig(), tf->domain_cc(), tf->range_sig(), domain);
2459 call->_tf = new_tf;
2460 // Make sure the change of type is applied before projections are processed by igvn
2461 _igvn.set_type(call, call->Value(&_igvn));
2462 _igvn.set_type(ret, ret->Value(&_igvn));
2463
2464 // Before any new projection is added:
2465 CallProjections* projs = call->extract_projections(true, true);
2466
2467 // Create temporary hook nodes that will be replaced below.
2468 // Add an input to prevent hook nodes from being dead.
2469 Node* ctl = new Node(call);
2470 Node* mem = new Node(ctl);
2471 Node* io = new Node(ctl);
2472 Node* ex_ctl = new Node(ctl);
2473 Node* ex_mem = new Node(ctl);
2474 Node* ex_io = new Node(ctl);
2475 Node* res = new Node(ctl);
2476
2477 // Allocate a new buffered inline type only if a new one is not returned
2478 Node* cast = transform_later(new CastP2XNode(ctl, res));
2479 Node* mask = MakeConX(0x1);
2480 Node* masked = transform_later(new AndXNode(cast, mask));
2481 Node* cmp = transform_later(new CmpXNode(masked, mask));
2482 Node* bol = transform_later(new BoolNode(cmp, BoolTest::eq));
2483 IfNode* allocation_iff = new IfNode(ctl, bol, PROB_MAX, COUNT_UNKNOWN);
2484 transform_later(allocation_iff);
2485 Node* allocation_ctl = transform_later(new IfTrueNode(allocation_iff));
2486 Node* no_allocation_ctl = transform_later(new IfFalseNode(allocation_iff));
2487 Node* no_allocation_res = transform_later(new CheckCastPPNode(no_allocation_ctl, res, TypeInstPtr::BOTTOM));
2488
2489 // Try to allocate a new buffered inline instance either from TLAB or eden space
2490 Node* needgc_ctrl = NULL; // needgc means slowcase, i.e. allocation failed
2491 CallLeafNoFPNode* handler_call;
2492 const bool alloc_in_place = (UseTLAB || Universe::heap()->supports_inline_contig_alloc());
2493 if (alloc_in_place) {
2494 Node* fast_oop_ctrl = NULL;
2495 Node* fast_oop_rawmem = NULL;
2496 Node* mask2 = MakeConX(-2);
2497 Node* masked2 = transform_later(new AndXNode(cast, mask2));
2498 Node* rawklassptr = transform_later(new CastX2PNode(masked2));
2499 Node* klass_node = transform_later(new CheckCastPPNode(allocation_ctl, rawklassptr, TypeInstKlassPtr::OBJECT_OR_NULL));
2500 Node* layout_val = make_load(NULL, mem, klass_node, in_bytes(Klass::layout_helper_offset()), TypeInt::INT, T_INT);
2501 Node* size_in_bytes = ConvI2X(layout_val);
2502 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2503 Node* fast_oop = bs->obj_allocate(this, mem, allocation_ctl, size_in_bytes, io, needgc_ctrl,
2504 fast_oop_ctrl, fast_oop_rawmem,
2505 AllocateInstancePrefetchLines);
2506 // Allocation succeed, initialize buffered inline instance header firstly,
2507 // and then initialize its fields with an inline class specific handler
2508 Node* mark_node = makecon(TypeRawPtr::make((address)markWord::inline_type_prototype().value()));
2509 fast_oop_rawmem = make_store(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::mark_offset_in_bytes(), mark_node, T_ADDRESS);
2510 fast_oop_rawmem = make_store(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::klass_offset_in_bytes(), klass_node, T_METADATA);
2511 if (UseCompressedClassPointers) {
2512 fast_oop_rawmem = make_store(fast_oop_ctrl, fast_oop_rawmem, fast_oop, oopDesc::klass_gap_offset_in_bytes(), intcon(0), T_INT);
2513 }
2514 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);
2515 Node* pack_handler = make_load(fast_oop_ctrl, fast_oop_rawmem, fixed_block, in_bytes(InlineKlass::pack_handler_offset()), TypeRawPtr::BOTTOM, T_ADDRESS);
2516 handler_call = new CallLeafNoFPNode(OptoRuntime::pack_inline_type_Type(),
2517 NULL,
2518 "pack handler",
2519 TypeRawPtr::BOTTOM);
2520 handler_call->init_req(TypeFunc::Control, fast_oop_ctrl);
2521 handler_call->init_req(TypeFunc::Memory, fast_oop_rawmem);
2522 handler_call->init_req(TypeFunc::I_O, top());
2523 handler_call->init_req(TypeFunc::FramePtr, call->in(TypeFunc::FramePtr));
2524 handler_call->init_req(TypeFunc::ReturnAdr, top());
2525 handler_call->init_req(TypeFunc::Parms, pack_handler);
2526 handler_call->init_req(TypeFunc::Parms+1, fast_oop);
2527 } else {
2528 needgc_ctrl = allocation_ctl;
2529 }
2530
2531 // Allocation failed, fall back to a runtime call
2532 CallStaticJavaNode* slow_call = new CallStaticJavaNode(OptoRuntime::store_inline_type_fields_Type(),
2533 StubRoutines::store_inline_type_fields_to_buf(),
2534 "store_inline_type_fields",
2535 TypePtr::BOTTOM);
2536 slow_call->init_req(TypeFunc::Control, needgc_ctrl);
2537 slow_call->init_req(TypeFunc::Memory, mem);
2538 slow_call->init_req(TypeFunc::I_O, io);
2539 slow_call->init_req(TypeFunc::FramePtr, call->in(TypeFunc::FramePtr));
2540 slow_call->init_req(TypeFunc::ReturnAdr, call->in(TypeFunc::ReturnAdr));
2541 slow_call->init_req(TypeFunc::Parms, res);
2542
2543 Node* slow_ctl = transform_later(new ProjNode(slow_call, TypeFunc::Control));
2544 Node* slow_mem = transform_later(new ProjNode(slow_call, TypeFunc::Memory));
2545 Node* slow_io = transform_later(new ProjNode(slow_call, TypeFunc::I_O));
2546 Node* slow_res = transform_later(new ProjNode(slow_call, TypeFunc::Parms));
2547 Node* slow_catc = transform_later(new CatchNode(slow_ctl, slow_io, 2));
2548 Node* slow_norm = transform_later(new CatchProjNode(slow_catc, CatchProjNode::fall_through_index, CatchProjNode::no_handler_bci));
2549 Node* slow_excp = transform_later(new CatchProjNode(slow_catc, CatchProjNode::catch_all_index, CatchProjNode::no_handler_bci));
2550
2551 Node* ex_r = new RegionNode(3);
2552 Node* ex_mem_phi = new PhiNode(ex_r, Type::MEMORY, TypePtr::BOTTOM);
2553 Node* ex_io_phi = new PhiNode(ex_r, Type::ABIO);
2554 ex_r->init_req(1, slow_excp);
2555 ex_mem_phi->init_req(1, slow_mem);
2556 ex_io_phi->init_req(1, slow_io);
2557 ex_r->init_req(2, ex_ctl);
2558 ex_mem_phi->init_req(2, ex_mem);
2559 ex_io_phi->init_req(2, ex_io);
2560 transform_later(ex_r);
2561 transform_later(ex_mem_phi);
2562 transform_later(ex_io_phi);
2563
2564 // We don't know how many values are returned. This assumes the
2565 // worst case, that all available registers are used.
2566 for (uint i = TypeFunc::Parms+1; i < domain->cnt(); i++) {
2567 if (domain->field_at(i) == Type::HALF) {
2568 slow_call->init_req(i, top());
2569 if (alloc_in_place) {
2570 handler_call->init_req(i+1, top());
2571 }
2572 continue;
2573 }
2574 Node* proj = transform_later(new ProjNode(call, i));
2575 slow_call->init_req(i, proj);
2576 if (alloc_in_place) {
2577 handler_call->init_req(i+1, proj);
2578 }
2579 }
2580 // We can safepoint at that new call
2581 slow_call->copy_call_debug_info(&_igvn, call);
2582 transform_later(slow_call);
2583 if (alloc_in_place) {
2584 transform_later(handler_call);
2585 }
2586
2587 Node* fast_ctl = NULL;
2588 Node* fast_res = NULL;
2589 MergeMemNode* fast_mem = NULL;
2590 if (alloc_in_place) {
2591 fast_ctl = transform_later(new ProjNode(handler_call, TypeFunc::Control));
2592 Node* rawmem = transform_later(new ProjNode(handler_call, TypeFunc::Memory));
2593 fast_res = transform_later(new ProjNode(handler_call, TypeFunc::Parms));
2594 fast_mem = MergeMemNode::make(mem);
2595 fast_mem->set_memory_at(Compile::AliasIdxRaw, rawmem);
2596 transform_later(fast_mem);
2597 }
2598
2599 Node* r = new RegionNode(alloc_in_place ? 4 : 3);
2600 Node* mem_phi = new PhiNode(r, Type::MEMORY, TypePtr::BOTTOM);
2601 Node* io_phi = new PhiNode(r, Type::ABIO);
2602 Node* res_phi = new PhiNode(r, TypeInstPtr::BOTTOM);
2603 r->init_req(1, no_allocation_ctl);
2604 mem_phi->init_req(1, mem);
2605 io_phi->init_req(1, io);
2606 res_phi->init_req(1, no_allocation_res);
2607 r->init_req(2, slow_norm);
2608 mem_phi->init_req(2, slow_mem);
2609 io_phi->init_req(2, slow_io);
2610 res_phi->init_req(2, slow_res);
2611 if (alloc_in_place) {
2612 r->init_req(3, fast_ctl);
2613 mem_phi->init_req(3, fast_mem);
2614 io_phi->init_req(3, io);
2615 res_phi->init_req(3, fast_res);
2616 }
2617 transform_later(r);
2618 transform_later(mem_phi);
2619 transform_later(io_phi);
2620 transform_later(res_phi);
2621
2622 assert(projs->nb_resproj == 1, "unexpected number of results");
2623 _igvn.replace_in_uses(projs->fallthrough_catchproj, r);
2624 _igvn.replace_in_uses(projs->fallthrough_memproj, mem_phi);
2625 _igvn.replace_in_uses(projs->fallthrough_ioproj, io_phi);
2626 _igvn.replace_in_uses(projs->resproj[0], res_phi);
2627 _igvn.replace_in_uses(projs->catchall_catchproj, ex_r);
2628 _igvn.replace_in_uses(projs->catchall_memproj, ex_mem_phi);
2629 _igvn.replace_in_uses(projs->catchall_ioproj, ex_io_phi);
2630 // The CatchNode should not use the ex_io_phi. Re-connect it to the catchall_ioproj.
2631 Node* cn = projs->fallthrough_catchproj->in(0);
2632 _igvn.replace_input_of(cn, 1, projs->catchall_ioproj);
2633
2634 _igvn.replace_node(ctl, projs->fallthrough_catchproj);
2635 _igvn.replace_node(mem, projs->fallthrough_memproj);
2636 _igvn.replace_node(io, projs->fallthrough_ioproj);
2637 _igvn.replace_node(res, projs->resproj[0]);
2638 _igvn.replace_node(ex_ctl, projs->catchall_catchproj);
2639 _igvn.replace_node(ex_mem, projs->catchall_memproj);
2640 _igvn.replace_node(ex_io, projs->catchall_ioproj);
2641 }
2642
2643 void PhaseMacroExpand::expand_subtypecheck_node(SubTypeCheckNode *check) {
2644 assert(check->in(SubTypeCheckNode::Control) == NULL, "should be pinned");
2645 Node* bol = check->unique_out();
2646 Node* obj_or_subklass = check->in(SubTypeCheckNode::ObjOrSubKlass);
2647 Node* superklass = check->in(SubTypeCheckNode::SuperKlass);
2648 assert(bol->is_Bool() && bol->as_Bool()->_test._test == BoolTest::ne, "unexpected bool node");
2649
2650 for (DUIterator_Last imin, i = bol->last_outs(imin); i >= imin; --i) {
2651 Node* iff = bol->last_out(i);
2652 assert(iff->is_If(), "where's the if?");
2653
2654 if (iff->in(0)->is_top()) {
2655 _igvn.replace_input_of(iff, 1, C->top());
2656 continue;
2657 }
2658
2659 Node* iftrue = iff->as_If()->proj_out(1);
2660 Node* iffalse = iff->as_If()->proj_out(0);
2661 Node* ctrl = iff->in(0);
2662
2663 Node* subklass = NULL;
2664 if (_igvn.type(obj_or_subklass)->isa_klassptr()) {
2665 subklass = obj_or_subklass;
2666 } else {
2667 Node* k_adr = basic_plus_adr(obj_or_subklass, oopDesc::klass_offset_in_bytes());
2668 subklass = _igvn.transform(LoadKlassNode::make(_igvn, NULL, C->immutable_memory(), k_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
2669 }
2670
2671 Node* not_subtype_ctrl = Phase::gen_subtype_check(subklass, superklass, &ctrl, NULL, _igvn);
2672
2673 _igvn.replace_input_of(iff, 0, C->top());
2674 _igvn.replace_node(iftrue, not_subtype_ctrl);
2675 _igvn.replace_node(iffalse, ctrl);
2676 }
2677 _igvn.replace_node(check, C->top());
2678 }
2679
2680 // FlatArrayCheckNode (array1 array2 ...) is expanded into:
2681 //
2682 // long mark = array1.mark | array2.mark | ...;
2683 // long locked_bit = markWord::unlocked_value & array1.mark & array2.mark & ...;
2684 // if (locked_bit == 0) {
2685 // // One array is locked, load prototype header from the klass
2686 // mark = array1.klass.proto | array2.klass.proto | ...
2687 // }
2688 // if ((mark & markWord::flat_array_bit_in_place) == 0) {
2689 // ...
2690 // }
2691 void PhaseMacroExpand::expand_flatarraycheck_node(FlatArrayCheckNode* check) {
2692 if (UseArrayMarkWordCheck) {
2693 Node* mark = MakeConX(0);
2694 Node* locked_bit = MakeConX(markWord::unlocked_value);
2695 Node* mem = check->in(FlatArrayCheckNode::Memory);
2696 for (uint i = FlatArrayCheckNode::Array; i < check->req(); ++i) {
2697 Node* ary = check->in(i);
2698 if (ary->is_top()) continue;
2699 const TypeAryPtr* t = _igvn.type(ary)->isa_aryptr();
2700 assert(!t->is_flat() && !t->is_not_flat(), "Should have been optimized out");
2701 Node* mark_adr = basic_plus_adr(ary, oopDesc::mark_offset_in_bytes());
2702 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));
2703 mark = _igvn.transform(new OrXNode(mark, mark_load));
2704 locked_bit = _igvn.transform(new AndXNode(locked_bit, mark_load));
2705 }
2706 assert(!mark->is_Con(), "Should have been optimized out");
2707 Node* cmp = _igvn.transform(new CmpXNode(locked_bit, MakeConX(0)));
2708 Node* is_unlocked = _igvn.transform(new BoolNode(cmp, BoolTest::ne));
2709
2710 // BoolNode might be shared, replace each if user
2711 Node* old_bol = check->unique_out();
2712 assert(old_bol->is_Bool() && old_bol->as_Bool()->_test._test == BoolTest::ne, "unexpected condition");
2713 for (DUIterator_Last imin, i = old_bol->last_outs(imin); i >= imin; --i) {
2714 IfNode* old_iff = old_bol->last_out(i)->as_If();
2715 Node* ctrl = old_iff->in(0);
2716 RegionNode* region = new RegionNode(3);
2717 Node* mark_phi = new PhiNode(region, TypeX_X);
2718
2719 // Check if array is unlocked
2720 IfNode* iff = _igvn.transform(new IfNode(ctrl, is_unlocked, PROB_MAX, COUNT_UNKNOWN))->as_If();
2721
2722 // Unlocked: Use bits from mark word
2723 region->init_req(1, _igvn.transform(new IfTrueNode(iff)));
2724 mark_phi->init_req(1, mark);
2725
2726 // Locked: Load prototype header from klass
2727 ctrl = _igvn.transform(new IfFalseNode(iff));
2728 Node* proto = MakeConX(0);
2729 for (uint i = FlatArrayCheckNode::Array; i < check->req(); ++i) {
2730 Node* ary = check->in(i);
2731 if (ary->is_top()) continue;
2732 // Make loads control dependent to make sure they are only executed if array is locked
2733 Node* klass_adr = basic_plus_adr(ary, oopDesc::klass_offset_in_bytes());
2734 Node* klass = _igvn.transform(LoadKlassNode::make(_igvn, ctrl, C->immutable_memory(), klass_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
2735 Node* proto_adr = basic_plus_adr(klass, in_bytes(Klass::prototype_header_offset()));
2736 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));
2737 proto = _igvn.transform(new OrXNode(proto, proto_load));
2738 }
2739 region->init_req(2, ctrl);
2740 mark_phi->init_req(2, proto);
2741
2742 // Check if flat array bits are set
2743 Node* mask = MakeConX(markWord::flat_array_bit_in_place);
2744 Node* masked = _igvn.transform(new AndXNode(_igvn.transform(mark_phi), mask));
2745 cmp = _igvn.transform(new CmpXNode(masked, MakeConX(0)));
2746 Node* is_not_flat = _igvn.transform(new BoolNode(cmp, BoolTest::eq));
2747
2748 ctrl = _igvn.transform(region);
2749 iff = _igvn.transform(new IfNode(ctrl, is_not_flat, PROB_MAX, COUNT_UNKNOWN))->as_If();
2750 _igvn.replace_node(old_iff, iff);
2751 }
2752 _igvn.replace_node(check, C->top());
2753 } else {
2754 // Fall back to layout helper check
2755 Node* lhs = intcon(0);
2756 for (uint i = FlatArrayCheckNode::Array; i < check->req(); ++i) {
2757 Node* ary = check->in(i);
2758 if (ary->is_top()) continue;
2759 const TypeAryPtr* t = _igvn.type(ary)->isa_aryptr();
2760 assert(!t->is_flat() && !t->is_not_flat(), "Should have been optimized out");
2761 Node* klass_adr = basic_plus_adr(ary, oopDesc::klass_offset_in_bytes());
2762 Node* klass = transform_later(LoadKlassNode::make(_igvn, NULL, C->immutable_memory(), klass_adr, TypeInstPtr::KLASS, TypeInstKlassPtr::OBJECT));
2763 Node* lh_addr = basic_plus_adr(klass, in_bytes(Klass::layout_helper_offset()));
2764 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));
2765 lhs = _igvn.transform(new OrINode(lhs, lh_val));
2766 }
2767 Node* masked = transform_later(new AndINode(lhs, intcon(Klass::_lh_array_tag_vt_value_bit_inplace)));
2768 Node* cmp = transform_later(new CmpINode(masked, intcon(0)));
2769 Node* bol = transform_later(new BoolNode(cmp, BoolTest::eq));
2770 Node* old_bol = check->unique_out();
2771 _igvn.replace_node(old_bol, bol);
2772 _igvn.replace_node(check, C->top());
2773 }
2774 }
2775
2776 //---------------------------eliminate_macro_nodes----------------------
2777 // Eliminate scalar replaced allocations and associated locks.
2778 void PhaseMacroExpand::eliminate_macro_nodes() {
2779 if (C->macro_count() == 0)
2780 return;
2781
2782 // Before elimination may re-mark (change to Nested or NonEscObj)
2783 // all associated (same box and obj) lock and unlock nodes.
2784 int cnt = C->macro_count();
2785 for (int i=0; i < cnt; i++) {
2786 Node *n = C->macro_node(i);
2787 if (n->is_AbstractLock()) { // Lock and Unlock nodes
2788 mark_eliminated_locking_nodes(n->as_AbstractLock());
2789 }
2790 }
2791 // Re-marking may break consistency of Coarsened locks.
2792 if (!C->coarsened_locks_consistent()) {
2793 return; // recompile without Coarsened locks if broken
2794 }
2795
2805 success = eliminate_locking_node(n->as_AbstractLock());
2806 }
2807 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2808 progress = progress || success;
2809 }
2810 }
2811 // Next, attempt to eliminate allocations
2812 _has_locks = false;
2813 progress = true;
2814 while (progress) {
2815 progress = false;
2816 for (int i = C->macro_count(); i > 0; i = MIN2(i - 1, C->macro_count())) { // more than 1 element can be eliminated at once
2817 Node* n = C->macro_node(i - 1);
2818 bool success = false;
2819 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2820 switch (n->class_id()) {
2821 case Node::Class_Allocate:
2822 case Node::Class_AllocateArray:
2823 success = eliminate_allocate_node(n->as_Allocate());
2824 break;
2825 case Node::Class_CallStaticJava: {
2826 CallStaticJavaNode* call = n->as_CallStaticJava();
2827 if (!call->method()->is_method_handle_intrinsic()) {
2828 success = eliminate_boxing_node(n->as_CallStaticJava());
2829 }
2830 break;
2831 }
2832 case Node::Class_Lock:
2833 case Node::Class_Unlock:
2834 assert(!n->as_AbstractLock()->is_eliminated(), "sanity");
2835 _has_locks = true;
2836 break;
2837 case Node::Class_ArrayCopy:
2838 break;
2839 case Node::Class_OuterStripMinedLoop:
2840 break;
2841 case Node::Class_SubTypeCheck:
2842 break;
2843 case Node::Class_Opaque1:
2844 break;
2845 case Node::Class_FlatArrayCheck:
2846 break;
2847 default:
2848 assert(n->Opcode() == Op_LoopLimit ||
2849 n->Opcode() == Op_Opaque2 ||
2850 n->Opcode() == Op_Opaque3 ||
2851 BarrierSet::barrier_set()->barrier_set_c2()->is_gc_barrier_node(n),
2852 "unknown node type in macro list");
2853 }
2854 assert(success == (C->macro_count() < old_macro_count), "elimination reduces macro count");
2855 progress = progress || success;
2856 }
2857 }
2858 }
2859
2860 //------------------------------expand_macro_nodes----------------------
2861 // Returns true if a failure occurred.
2862 bool PhaseMacroExpand::expand_macro_nodes() {
2863 // Last attempt to eliminate macro nodes.
2864 eliminate_macro_nodes();
2865 if (C->failing()) return true;
2866
2867 // Eliminate Opaque and LoopLimit nodes. Do it after all loop optimizations.
2868 bool progress = true;
2869 while (progress) {
2870 progress = false;
2871 for (int i = C->macro_count(); i > 0; i--) {
2872 Node* n = C->macro_node(i-1);
2873 bool success = false;
2874 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2875 if (n->Opcode() == Op_LoopLimit) {
2876 // Remove it from macro list and put on IGVN worklist to optimize.
2877 C->remove_macro_node(n);
2878 _igvn._worklist.push(n);
2879 success = true;
2880 } else if (n->Opcode() == Op_CallStaticJava) {
2881 CallStaticJavaNode* call = n->as_CallStaticJava();
2882 if (!call->method()->is_method_handle_intrinsic()) {
2883 // Remove it from macro list and put on IGVN worklist to optimize.
2884 C->remove_macro_node(n);
2885 _igvn._worklist.push(n);
2886 success = true;
2887 }
2888 } else if (n->is_Opaque1() || n->Opcode() == Op_Opaque2) {
2889 _igvn.replace_node(n, n->in(1));
2890 success = true;
2891 #if INCLUDE_RTM_OPT
2892 } else if ((n->Opcode() == Op_Opaque3) && ((Opaque3Node*)n)->rtm_opt()) {
2893 assert(C->profile_rtm(), "should be used only in rtm deoptimization code");
2894 assert((n->outcnt() == 1) && n->unique_out()->is_Cmp(), "");
2895 Node* cmp = n->unique_out();
2896 #ifdef ASSERT
2897 // Validate graph.
2898 assert((cmp->outcnt() == 1) && cmp->unique_out()->is_Bool(), "");
2899 BoolNode* bol = cmp->unique_out()->as_Bool();
2900 assert((bol->outcnt() == 1) && bol->unique_out()->is_If() &&
2901 (bol->_test._test == BoolTest::ne), "");
2902 IfNode* ifn = bol->unique_out()->as_If();
2903 assert((ifn->outcnt() == 2) &&
2904 ifn->proj_out(1)->is_uncommon_trap_proj(Deoptimization::Reason_rtm_state_change) != NULL, "");
2905 #endif
2906 Node* repl = n->in(1);
2907 if (!_has_locks) {
2957 // Worst case is a macro node gets expanded into about 200 nodes.
2958 // Allow 50% more for optimization.
2959 if (C->check_node_count(300, "out of nodes before macro expansion")) {
2960 return true;
2961 }
2962
2963 DEBUG_ONLY(int old_macro_count = C->macro_count();)
2964 switch (n->class_id()) {
2965 case Node::Class_Lock:
2966 expand_lock_node(n->as_Lock());
2967 break;
2968 case Node::Class_Unlock:
2969 expand_unlock_node(n->as_Unlock());
2970 break;
2971 case Node::Class_ArrayCopy:
2972 expand_arraycopy_node(n->as_ArrayCopy());
2973 break;
2974 case Node::Class_SubTypeCheck:
2975 expand_subtypecheck_node(n->as_SubTypeCheck());
2976 break;
2977 case Node::Class_CallStaticJava:
2978 expand_mh_intrinsic_return(n->as_CallStaticJava());
2979 C->remove_macro_node(n);
2980 break;
2981 case Node::Class_FlatArrayCheck:
2982 expand_flatarraycheck_node(n->as_FlatArrayCheck());
2983 break;
2984 default:
2985 assert(false, "unknown node type in macro list");
2986 }
2987 assert(C->macro_count() == (old_macro_count - 1), "expansion must have deleted one node from macro list");
2988 if (C->failing()) return true;
2989
2990 // Clean up the graph so we're less likely to hit the maximum node
2991 // limit
2992 _igvn.set_delay_transform(false);
2993 _igvn.optimize();
2994 if (C->failing()) return true;
2995 _igvn.set_delay_transform(true);
2996 }
2997
2998 // All nodes except Allocate nodes are expanded now. There could be
2999 // new optimization opportunities (such as folding newly created
3000 // load from a just allocated object). Run IGVN.
3001
3002 // expand "macro" nodes
3003 // nodes are removed from the macro list as they are processed
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