Fri, 12 Feb 2010 15:27:36 -0800
Merge
1 /*
2 * Copyright 2005-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_escape.cpp.incl"
28 void PointsToNode::add_edge(uint targIdx, PointsToNode::EdgeType et) {
29 uint v = (targIdx << EdgeShift) + ((uint) et);
30 if (_edges == NULL) {
31 Arena *a = Compile::current()->comp_arena();
32 _edges = new(a) GrowableArray<uint>(a, INITIAL_EDGE_COUNT, 0, 0);
33 }
34 _edges->append_if_missing(v);
35 }
37 void PointsToNode::remove_edge(uint targIdx, PointsToNode::EdgeType et) {
38 uint v = (targIdx << EdgeShift) + ((uint) et);
40 _edges->remove(v);
41 }
43 #ifndef PRODUCT
44 static const char *node_type_names[] = {
45 "UnknownType",
46 "JavaObject",
47 "LocalVar",
48 "Field"
49 };
51 static const char *esc_names[] = {
52 "UnknownEscape",
53 "NoEscape",
54 "ArgEscape",
55 "GlobalEscape"
56 };
58 static const char *edge_type_suffix[] = {
59 "?", // UnknownEdge
60 "P", // PointsToEdge
61 "D", // DeferredEdge
62 "F" // FieldEdge
63 };
65 void PointsToNode::dump(bool print_state) const {
66 NodeType nt = node_type();
67 tty->print("%s ", node_type_names[(int) nt]);
68 if (print_state) {
69 EscapeState es = escape_state();
70 tty->print("%s %s ", esc_names[(int) es], _scalar_replaceable ? "":"NSR");
71 }
72 tty->print("[[");
73 for (uint i = 0; i < edge_count(); i++) {
74 tty->print(" %d%s", edge_target(i), edge_type_suffix[(int) edge_type(i)]);
75 }
76 tty->print("]] ");
77 if (_node == NULL)
78 tty->print_cr("<null>");
79 else
80 _node->dump();
81 }
82 #endif
84 ConnectionGraph::ConnectionGraph(Compile * C) :
85 _nodes(C->comp_arena(), C->unique(), C->unique(), PointsToNode()),
86 _processed(C->comp_arena()),
87 _collecting(true),
88 _compile(C),
89 _node_map(C->comp_arena()) {
91 _phantom_object = C->top()->_idx,
92 add_node(C->top(), PointsToNode::JavaObject, PointsToNode::GlobalEscape,true);
94 // Add ConP(#NULL) and ConN(#NULL) nodes.
95 PhaseGVN* igvn = C->initial_gvn();
96 Node* oop_null = igvn->zerocon(T_OBJECT);
97 _oop_null = oop_null->_idx;
98 assert(_oop_null < C->unique(), "should be created already");
99 add_node(oop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true);
101 if (UseCompressedOops) {
102 Node* noop_null = igvn->zerocon(T_NARROWOOP);
103 _noop_null = noop_null->_idx;
104 assert(_noop_null < C->unique(), "should be created already");
105 add_node(noop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true);
106 }
107 }
109 void ConnectionGraph::add_pointsto_edge(uint from_i, uint to_i) {
110 PointsToNode *f = ptnode_adr(from_i);
111 PointsToNode *t = ptnode_adr(to_i);
113 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set");
114 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of PointsTo edge");
115 assert(t->node_type() == PointsToNode::JavaObject, "invalid destination of PointsTo edge");
116 f->add_edge(to_i, PointsToNode::PointsToEdge);
117 }
119 void ConnectionGraph::add_deferred_edge(uint from_i, uint to_i) {
120 PointsToNode *f = ptnode_adr(from_i);
121 PointsToNode *t = ptnode_adr(to_i);
123 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set");
124 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of Deferred edge");
125 assert(t->node_type() == PointsToNode::LocalVar || t->node_type() == PointsToNode::Field, "invalid destination of Deferred edge");
126 // don't add a self-referential edge, this can occur during removal of
127 // deferred edges
128 if (from_i != to_i)
129 f->add_edge(to_i, PointsToNode::DeferredEdge);
130 }
132 int ConnectionGraph::address_offset(Node* adr, PhaseTransform *phase) {
133 const Type *adr_type = phase->type(adr);
134 if (adr->is_AddP() && adr_type->isa_oopptr() == NULL &&
135 adr->in(AddPNode::Address)->is_Proj() &&
136 adr->in(AddPNode::Address)->in(0)->is_Allocate()) {
137 // We are computing a raw address for a store captured by an Initialize
138 // compute an appropriate address type. AddP cases #3 and #5 (see below).
139 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot);
140 assert(offs != Type::OffsetBot ||
141 adr->in(AddPNode::Address)->in(0)->is_AllocateArray(),
142 "offset must be a constant or it is initialization of array");
143 return offs;
144 }
145 const TypePtr *t_ptr = adr_type->isa_ptr();
146 assert(t_ptr != NULL, "must be a pointer type");
147 return t_ptr->offset();
148 }
150 void ConnectionGraph::add_field_edge(uint from_i, uint to_i, int offset) {
151 PointsToNode *f = ptnode_adr(from_i);
152 PointsToNode *t = ptnode_adr(to_i);
154 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set");
155 assert(f->node_type() == PointsToNode::JavaObject, "invalid destination of Field edge");
156 assert(t->node_type() == PointsToNode::Field, "invalid destination of Field edge");
157 assert (t->offset() == -1 || t->offset() == offset, "conflicting field offsets");
158 t->set_offset(offset);
160 f->add_edge(to_i, PointsToNode::FieldEdge);
161 }
163 void ConnectionGraph::set_escape_state(uint ni, PointsToNode::EscapeState es) {
164 PointsToNode *npt = ptnode_adr(ni);
165 PointsToNode::EscapeState old_es = npt->escape_state();
166 if (es > old_es)
167 npt->set_escape_state(es);
168 }
170 void ConnectionGraph::add_node(Node *n, PointsToNode::NodeType nt,
171 PointsToNode::EscapeState es, bool done) {
172 PointsToNode* ptadr = ptnode_adr(n->_idx);
173 ptadr->_node = n;
174 ptadr->set_node_type(nt);
176 // inline set_escape_state(idx, es);
177 PointsToNode::EscapeState old_es = ptadr->escape_state();
178 if (es > old_es)
179 ptadr->set_escape_state(es);
181 if (done)
182 _processed.set(n->_idx);
183 }
185 PointsToNode::EscapeState ConnectionGraph::escape_state(Node *n, PhaseTransform *phase) {
186 uint idx = n->_idx;
187 PointsToNode::EscapeState es;
189 // If we are still collecting or there were no non-escaping allocations
190 // we don't know the answer yet
191 if (_collecting)
192 return PointsToNode::UnknownEscape;
194 // if the node was created after the escape computation, return
195 // UnknownEscape
196 if (idx >= nodes_size())
197 return PointsToNode::UnknownEscape;
199 es = ptnode_adr(idx)->escape_state();
201 // if we have already computed a value, return it
202 if (es != PointsToNode::UnknownEscape &&
203 ptnode_adr(idx)->node_type() == PointsToNode::JavaObject)
204 return es;
206 // PointsTo() calls n->uncast() which can return a new ideal node.
207 if (n->uncast()->_idx >= nodes_size())
208 return PointsToNode::UnknownEscape;
210 // compute max escape state of anything this node could point to
211 VectorSet ptset(Thread::current()->resource_area());
212 PointsTo(ptset, n, phase);
213 for(VectorSetI i(&ptset); i.test() && es != PointsToNode::GlobalEscape; ++i) {
214 uint pt = i.elem;
215 PointsToNode::EscapeState pes = ptnode_adr(pt)->escape_state();
216 if (pes > es)
217 es = pes;
218 }
219 // cache the computed escape state
220 assert(es != PointsToNode::UnknownEscape, "should have computed an escape state");
221 ptnode_adr(idx)->set_escape_state(es);
222 return es;
223 }
225 void ConnectionGraph::PointsTo(VectorSet &ptset, Node * n, PhaseTransform *phase) {
226 VectorSet visited(Thread::current()->resource_area());
227 GrowableArray<uint> worklist;
229 #ifdef ASSERT
230 Node *orig_n = n;
231 #endif
233 n = n->uncast();
234 PointsToNode* npt = ptnode_adr(n->_idx);
236 // If we have a JavaObject, return just that object
237 if (npt->node_type() == PointsToNode::JavaObject) {
238 ptset.set(n->_idx);
239 return;
240 }
241 #ifdef ASSERT
242 if (npt->_node == NULL) {
243 if (orig_n != n)
244 orig_n->dump();
245 n->dump();
246 assert(npt->_node != NULL, "unregistered node");
247 }
248 #endif
249 worklist.push(n->_idx);
250 while(worklist.length() > 0) {
251 int ni = worklist.pop();
252 if (visited.test_set(ni))
253 continue;
255 PointsToNode* pn = ptnode_adr(ni);
256 // ensure that all inputs of a Phi have been processed
257 assert(!_collecting || !pn->_node->is_Phi() || _processed.test(ni),"");
259 int edges_processed = 0;
260 uint e_cnt = pn->edge_count();
261 for (uint e = 0; e < e_cnt; e++) {
262 uint etgt = pn->edge_target(e);
263 PointsToNode::EdgeType et = pn->edge_type(e);
264 if (et == PointsToNode::PointsToEdge) {
265 ptset.set(etgt);
266 edges_processed++;
267 } else if (et == PointsToNode::DeferredEdge) {
268 worklist.push(etgt);
269 edges_processed++;
270 } else {
271 assert(false,"neither PointsToEdge or DeferredEdge");
272 }
273 }
274 if (edges_processed == 0) {
275 // no deferred or pointsto edges found. Assume the value was set
276 // outside this method. Add the phantom object to the pointsto set.
277 ptset.set(_phantom_object);
278 }
279 }
280 }
282 void ConnectionGraph::remove_deferred(uint ni, GrowableArray<uint>* deferred_edges, VectorSet* visited) {
283 // This method is most expensive during ConnectionGraph construction.
284 // Reuse vectorSet and an additional growable array for deferred edges.
285 deferred_edges->clear();
286 visited->Clear();
288 visited->set(ni);
289 PointsToNode *ptn = ptnode_adr(ni);
291 // Mark current edges as visited and move deferred edges to separate array.
292 for (uint i = 0; i < ptn->edge_count(); ) {
293 uint t = ptn->edge_target(i);
294 #ifdef ASSERT
295 assert(!visited->test_set(t), "expecting no duplications");
296 #else
297 visited->set(t);
298 #endif
299 if (ptn->edge_type(i) == PointsToNode::DeferredEdge) {
300 ptn->remove_edge(t, PointsToNode::DeferredEdge);
301 deferred_edges->append(t);
302 } else {
303 i++;
304 }
305 }
306 for (int next = 0; next < deferred_edges->length(); ++next) {
307 uint t = deferred_edges->at(next);
308 PointsToNode *ptt = ptnode_adr(t);
309 uint e_cnt = ptt->edge_count();
310 for (uint e = 0; e < e_cnt; e++) {
311 uint etgt = ptt->edge_target(e);
312 if (visited->test_set(etgt))
313 continue;
315 PointsToNode::EdgeType et = ptt->edge_type(e);
316 if (et == PointsToNode::PointsToEdge) {
317 add_pointsto_edge(ni, etgt);
318 if(etgt == _phantom_object) {
319 // Special case - field set outside (globally escaping).
320 ptn->set_escape_state(PointsToNode::GlobalEscape);
321 }
322 } else if (et == PointsToNode::DeferredEdge) {
323 deferred_edges->append(etgt);
324 } else {
325 assert(false,"invalid connection graph");
326 }
327 }
328 }
329 }
332 // Add an edge to node given by "to_i" from any field of adr_i whose offset
333 // matches "offset" A deferred edge is added if to_i is a LocalVar, and
334 // a pointsto edge is added if it is a JavaObject
336 void ConnectionGraph::add_edge_from_fields(uint adr_i, uint to_i, int offs) {
337 PointsToNode* an = ptnode_adr(adr_i);
338 PointsToNode* to = ptnode_adr(to_i);
339 bool deferred = (to->node_type() == PointsToNode::LocalVar);
341 for (uint fe = 0; fe < an->edge_count(); fe++) {
342 assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge");
343 int fi = an->edge_target(fe);
344 PointsToNode* pf = ptnode_adr(fi);
345 int po = pf->offset();
346 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) {
347 if (deferred)
348 add_deferred_edge(fi, to_i);
349 else
350 add_pointsto_edge(fi, to_i);
351 }
352 }
353 }
355 // Add a deferred edge from node given by "from_i" to any field of adr_i
356 // whose offset matches "offset".
357 void ConnectionGraph::add_deferred_edge_to_fields(uint from_i, uint adr_i, int offs) {
358 PointsToNode* an = ptnode_adr(adr_i);
359 for (uint fe = 0; fe < an->edge_count(); fe++) {
360 assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge");
361 int fi = an->edge_target(fe);
362 PointsToNode* pf = ptnode_adr(fi);
363 int po = pf->offset();
364 if (pf->edge_count() == 0) {
365 // we have not seen any stores to this field, assume it was set outside this method
366 add_pointsto_edge(fi, _phantom_object);
367 }
368 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) {
369 add_deferred_edge(from_i, fi);
370 }
371 }
372 }
374 // Helper functions
376 static Node* get_addp_base(Node *addp) {
377 assert(addp->is_AddP(), "must be AddP");
378 //
379 // AddP cases for Base and Address inputs:
380 // case #1. Direct object's field reference:
381 // Allocate
382 // |
383 // Proj #5 ( oop result )
384 // |
385 // CheckCastPP (cast to instance type)
386 // | |
387 // AddP ( base == address )
388 //
389 // case #2. Indirect object's field reference:
390 // Phi
391 // |
392 // CastPP (cast to instance type)
393 // | |
394 // AddP ( base == address )
395 //
396 // case #3. Raw object's field reference for Initialize node:
397 // Allocate
398 // |
399 // Proj #5 ( oop result )
400 // top |
401 // \ |
402 // AddP ( base == top )
403 //
404 // case #4. Array's element reference:
405 // {CheckCastPP | CastPP}
406 // | | |
407 // | AddP ( array's element offset )
408 // | |
409 // AddP ( array's offset )
410 //
411 // case #5. Raw object's field reference for arraycopy stub call:
412 // The inline_native_clone() case when the arraycopy stub is called
413 // after the allocation before Initialize and CheckCastPP nodes.
414 // Allocate
415 // |
416 // Proj #5 ( oop result )
417 // | |
418 // AddP ( base == address )
419 //
420 // case #6. Constant Pool, ThreadLocal, CastX2P or
421 // Raw object's field reference:
422 // {ConP, ThreadLocal, CastX2P, raw Load}
423 // top |
424 // \ |
425 // AddP ( base == top )
426 //
427 // case #7. Klass's field reference.
428 // LoadKlass
429 // | |
430 // AddP ( base == address )
431 //
432 // case #8. narrow Klass's field reference.
433 // LoadNKlass
434 // |
435 // DecodeN
436 // | |
437 // AddP ( base == address )
438 //
439 Node *base = addp->in(AddPNode::Base)->uncast();
440 if (base->is_top()) { // The AddP case #3 and #6.
441 base = addp->in(AddPNode::Address)->uncast();
442 while (base->is_AddP()) {
443 // Case #6 (unsafe access) may have several chained AddP nodes.
444 assert(base->in(AddPNode::Base)->is_top(), "expected unsafe access address only");
445 base = base->in(AddPNode::Address)->uncast();
446 }
447 assert(base->Opcode() == Op_ConP || base->Opcode() == Op_ThreadLocal ||
448 base->Opcode() == Op_CastX2P || base->is_DecodeN() ||
449 (base->is_Mem() && base->bottom_type() == TypeRawPtr::NOTNULL) ||
450 (base->is_Proj() && base->in(0)->is_Allocate()), "sanity");
451 }
452 return base;
453 }
455 static Node* find_second_addp(Node* addp, Node* n) {
456 assert(addp->is_AddP() && addp->outcnt() > 0, "Don't process dead nodes");
458 Node* addp2 = addp->raw_out(0);
459 if (addp->outcnt() == 1 && addp2->is_AddP() &&
460 addp2->in(AddPNode::Base) == n &&
461 addp2->in(AddPNode::Address) == addp) {
463 assert(addp->in(AddPNode::Base) == n, "expecting the same base");
464 //
465 // Find array's offset to push it on worklist first and
466 // as result process an array's element offset first (pushed second)
467 // to avoid CastPP for the array's offset.
468 // Otherwise the inserted CastPP (LocalVar) will point to what
469 // the AddP (Field) points to. Which would be wrong since
470 // the algorithm expects the CastPP has the same point as
471 // as AddP's base CheckCastPP (LocalVar).
472 //
473 // ArrayAllocation
474 // |
475 // CheckCastPP
476 // |
477 // memProj (from ArrayAllocation CheckCastPP)
478 // | ||
479 // | || Int (element index)
480 // | || | ConI (log(element size))
481 // | || | /
482 // | || LShift
483 // | || /
484 // | AddP (array's element offset)
485 // | |
486 // | | ConI (array's offset: #12(32-bits) or #24(64-bits))
487 // | / /
488 // AddP (array's offset)
489 // |
490 // Load/Store (memory operation on array's element)
491 //
492 return addp2;
493 }
494 return NULL;
495 }
497 //
498 // Adjust the type and inputs of an AddP which computes the
499 // address of a field of an instance
500 //
501 bool ConnectionGraph::split_AddP(Node *addp, Node *base, PhaseGVN *igvn) {
502 const TypeOopPtr *base_t = igvn->type(base)->isa_oopptr();
503 assert(base_t != NULL && base_t->is_known_instance(), "expecting instance oopptr");
504 const TypeOopPtr *t = igvn->type(addp)->isa_oopptr();
505 if (t == NULL) {
506 // We are computing a raw address for a store captured by an Initialize
507 // compute an appropriate address type (cases #3 and #5).
508 assert(igvn->type(addp) == TypeRawPtr::NOTNULL, "must be raw pointer");
509 assert(addp->in(AddPNode::Address)->is_Proj(), "base of raw address must be result projection from allocation");
510 intptr_t offs = (int)igvn->find_intptr_t_con(addp->in(AddPNode::Offset), Type::OffsetBot);
511 assert(offs != Type::OffsetBot, "offset must be a constant");
512 t = base_t->add_offset(offs)->is_oopptr();
513 }
514 int inst_id = base_t->instance_id();
515 assert(!t->is_known_instance() || t->instance_id() == inst_id,
516 "old type must be non-instance or match new type");
518 // The type 't' could be subclass of 'base_t'.
519 // As result t->offset() could be large then base_t's size and it will
520 // cause the failure in add_offset() with narrow oops since TypeOopPtr()
521 // constructor verifies correctness of the offset.
522 //
523 // It could happened on subclass's branch (from the type profiling
524 // inlining) which was not eliminated during parsing since the exactness
525 // of the allocation type was not propagated to the subclass type check.
526 //
527 // Or the type 't' could be not related to 'base_t' at all.
528 // It could happened when CHA type is different from MDO type on a dead path
529 // (for example, from instanceof check) which is not collapsed during parsing.
530 //
531 // Do nothing for such AddP node and don't process its users since
532 // this code branch will go away.
533 //
534 if (!t->is_known_instance() &&
535 !base_t->klass()->is_subtype_of(t->klass())) {
536 return false; // bail out
537 }
539 const TypeOopPtr *tinst = base_t->add_offset(t->offset())->is_oopptr();
540 // Do NOT remove the next line: ensure a new alias index is allocated
541 // for the instance type. Note: C++ will not remove it since the call
542 // has side effect.
543 int alias_idx = _compile->get_alias_index(tinst);
544 igvn->set_type(addp, tinst);
545 // record the allocation in the node map
546 assert(ptnode_adr(addp->_idx)->_node != NULL, "should be registered");
547 set_map(addp->_idx, get_map(base->_idx));
549 // Set addp's Base and Address to 'base'.
550 Node *abase = addp->in(AddPNode::Base);
551 Node *adr = addp->in(AddPNode::Address);
552 if (adr->is_Proj() && adr->in(0)->is_Allocate() &&
553 adr->in(0)->_idx == (uint)inst_id) {
554 // Skip AddP cases #3 and #5.
555 } else {
556 assert(!abase->is_top(), "sanity"); // AddP case #3
557 if (abase != base) {
558 igvn->hash_delete(addp);
559 addp->set_req(AddPNode::Base, base);
560 if (abase == adr) {
561 addp->set_req(AddPNode::Address, base);
562 } else {
563 // AddP case #4 (adr is array's element offset AddP node)
564 #ifdef ASSERT
565 const TypeOopPtr *atype = igvn->type(adr)->isa_oopptr();
566 assert(adr->is_AddP() && atype != NULL &&
567 atype->instance_id() == inst_id, "array's element offset should be processed first");
568 #endif
569 }
570 igvn->hash_insert(addp);
571 }
572 }
573 // Put on IGVN worklist since at least addp's type was changed above.
574 record_for_optimizer(addp);
575 return true;
576 }
578 //
579 // Create a new version of orig_phi if necessary. Returns either the newly
580 // created phi or an existing phi. Sets create_new to indicate wheter a new
581 // phi was created. Cache the last newly created phi in the node map.
582 //
583 PhiNode *ConnectionGraph::create_split_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn, bool &new_created) {
584 Compile *C = _compile;
585 new_created = false;
586 int phi_alias_idx = C->get_alias_index(orig_phi->adr_type());
587 // nothing to do if orig_phi is bottom memory or matches alias_idx
588 if (phi_alias_idx == alias_idx) {
589 return orig_phi;
590 }
591 // Have we recently created a Phi for this alias index?
592 PhiNode *result = get_map_phi(orig_phi->_idx);
593 if (result != NULL && C->get_alias_index(result->adr_type()) == alias_idx) {
594 return result;
595 }
596 // Previous check may fail when the same wide memory Phi was split into Phis
597 // for different memory slices. Search all Phis for this region.
598 if (result != NULL) {
599 Node* region = orig_phi->in(0);
600 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) {
601 Node* phi = region->fast_out(i);
602 if (phi->is_Phi() &&
603 C->get_alias_index(phi->as_Phi()->adr_type()) == alias_idx) {
604 assert(phi->_idx >= nodes_size(), "only new Phi per instance memory slice");
605 return phi->as_Phi();
606 }
607 }
608 }
609 if ((int)C->unique() + 2*NodeLimitFudgeFactor > MaxNodeLimit) {
610 if (C->do_escape_analysis() == true && !C->failing()) {
611 // Retry compilation without escape analysis.
612 // If this is the first failure, the sentinel string will "stick"
613 // to the Compile object, and the C2Compiler will see it and retry.
614 C->record_failure(C2Compiler::retry_no_escape_analysis());
615 }
616 return NULL;
617 }
618 orig_phi_worklist.append_if_missing(orig_phi);
619 const TypePtr *atype = C->get_adr_type(alias_idx);
620 result = PhiNode::make(orig_phi->in(0), NULL, Type::MEMORY, atype);
621 C->copy_node_notes_to(result, orig_phi);
622 igvn->set_type(result, result->bottom_type());
623 record_for_optimizer(result);
625 debug_only(Node* pn = ptnode_adr(orig_phi->_idx)->_node;)
626 assert(pn == NULL || pn == orig_phi, "wrong node");
627 set_map(orig_phi->_idx, result);
628 ptnode_adr(orig_phi->_idx)->_node = orig_phi;
630 new_created = true;
631 return result;
632 }
634 //
635 // Return a new version of Memory Phi "orig_phi" with the inputs having the
636 // specified alias index.
637 //
638 PhiNode *ConnectionGraph::split_memory_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn) {
640 assert(alias_idx != Compile::AliasIdxBot, "can't split out bottom memory");
641 Compile *C = _compile;
642 bool new_phi_created;
643 PhiNode *result = create_split_phi(orig_phi, alias_idx, orig_phi_worklist, igvn, new_phi_created);
644 if (!new_phi_created) {
645 return result;
646 }
648 GrowableArray<PhiNode *> phi_list;
649 GrowableArray<uint> cur_input;
651 PhiNode *phi = orig_phi;
652 uint idx = 1;
653 bool finished = false;
654 while(!finished) {
655 while (idx < phi->req()) {
656 Node *mem = find_inst_mem(phi->in(idx), alias_idx, orig_phi_worklist, igvn);
657 if (mem != NULL && mem->is_Phi()) {
658 PhiNode *newphi = create_split_phi(mem->as_Phi(), alias_idx, orig_phi_worklist, igvn, new_phi_created);
659 if (new_phi_created) {
660 // found an phi for which we created a new split, push current one on worklist and begin
661 // processing new one
662 phi_list.push(phi);
663 cur_input.push(idx);
664 phi = mem->as_Phi();
665 result = newphi;
666 idx = 1;
667 continue;
668 } else {
669 mem = newphi;
670 }
671 }
672 if (C->failing()) {
673 return NULL;
674 }
675 result->set_req(idx++, mem);
676 }
677 #ifdef ASSERT
678 // verify that the new Phi has an input for each input of the original
679 assert( phi->req() == result->req(), "must have same number of inputs.");
680 assert( result->in(0) != NULL && result->in(0) == phi->in(0), "regions must match");
681 #endif
682 // Check if all new phi's inputs have specified alias index.
683 // Otherwise use old phi.
684 for (uint i = 1; i < phi->req(); i++) {
685 Node* in = result->in(i);
686 assert((phi->in(i) == NULL) == (in == NULL), "inputs must correspond.");
687 }
688 // we have finished processing a Phi, see if there are any more to do
689 finished = (phi_list.length() == 0 );
690 if (!finished) {
691 phi = phi_list.pop();
692 idx = cur_input.pop();
693 PhiNode *prev_result = get_map_phi(phi->_idx);
694 prev_result->set_req(idx++, result);
695 result = prev_result;
696 }
697 }
698 return result;
699 }
702 //
703 // The next methods are derived from methods in MemNode.
704 //
705 static Node *step_through_mergemem(MergeMemNode *mmem, int alias_idx, const TypeOopPtr *tinst) {
706 Node *mem = mmem;
707 // TypeInstPtr::NOTNULL+any is an OOP with unknown offset - generally
708 // means an array I have not precisely typed yet. Do not do any
709 // alias stuff with it any time soon.
710 if( tinst->base() != Type::AnyPtr &&
711 !(tinst->klass()->is_java_lang_Object() &&
712 tinst->offset() == Type::OffsetBot) ) {
713 mem = mmem->memory_at(alias_idx);
714 // Update input if it is progress over what we have now
715 }
716 return mem;
717 }
719 //
720 // Move memory users to their memory slices.
721 //
722 void ConnectionGraph::move_inst_mem(Node* n, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *igvn) {
723 Compile* C = _compile;
725 const TypePtr* tp = igvn->type(n->in(MemNode::Address))->isa_ptr();
726 assert(tp != NULL, "ptr type");
727 int alias_idx = C->get_alias_index(tp);
728 int general_idx = C->get_general_index(alias_idx);
730 // Move users first
731 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
732 Node* use = n->fast_out(i);
733 if (use->is_MergeMem()) {
734 MergeMemNode* mmem = use->as_MergeMem();
735 assert(n == mmem->memory_at(alias_idx), "should be on instance memory slice");
736 if (n != mmem->memory_at(general_idx) || alias_idx == general_idx) {
737 continue; // Nothing to do
738 }
739 // Replace previous general reference to mem node.
740 uint orig_uniq = C->unique();
741 Node* m = find_inst_mem(n, general_idx, orig_phis, igvn);
742 assert(orig_uniq == C->unique(), "no new nodes");
743 mmem->set_memory_at(general_idx, m);
744 --imax;
745 --i;
746 } else if (use->is_MemBar()) {
747 assert(!use->is_Initialize(), "initializing stores should not be moved");
748 if (use->req() > MemBarNode::Precedent &&
749 use->in(MemBarNode::Precedent) == n) {
750 // Don't move related membars.
751 record_for_optimizer(use);
752 continue;
753 }
754 tp = use->as_MemBar()->adr_type()->isa_ptr();
755 if (tp != NULL && C->get_alias_index(tp) == alias_idx ||
756 alias_idx == general_idx) {
757 continue; // Nothing to do
758 }
759 // Move to general memory slice.
760 uint orig_uniq = C->unique();
761 Node* m = find_inst_mem(n, general_idx, orig_phis, igvn);
762 assert(orig_uniq == C->unique(), "no new nodes");
763 igvn->hash_delete(use);
764 imax -= use->replace_edge(n, m);
765 igvn->hash_insert(use);
766 record_for_optimizer(use);
767 --i;
768 #ifdef ASSERT
769 } else if (use->is_Mem()) {
770 if (use->Opcode() == Op_StoreCM && use->in(MemNode::OopStore) == n) {
771 // Don't move related cardmark.
772 continue;
773 }
774 // Memory nodes should have new memory input.
775 tp = igvn->type(use->in(MemNode::Address))->isa_ptr();
776 assert(tp != NULL, "ptr type");
777 int idx = C->get_alias_index(tp);
778 assert(get_map(use->_idx) != NULL || idx == alias_idx,
779 "Following memory nodes should have new memory input or be on the same memory slice");
780 } else if (use->is_Phi()) {
781 // Phi nodes should be split and moved already.
782 tp = use->as_Phi()->adr_type()->isa_ptr();
783 assert(tp != NULL, "ptr type");
784 int idx = C->get_alias_index(tp);
785 assert(idx == alias_idx, "Following Phi nodes should be on the same memory slice");
786 } else {
787 use->dump();
788 assert(false, "should not be here");
789 #endif
790 }
791 }
792 }
794 //
795 // Search memory chain of "mem" to find a MemNode whose address
796 // is the specified alias index.
797 //
798 Node* ConnectionGraph::find_inst_mem(Node *orig_mem, int alias_idx, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *phase) {
799 if (orig_mem == NULL)
800 return orig_mem;
801 Compile* C = phase->C;
802 const TypeOopPtr *tinst = C->get_adr_type(alias_idx)->isa_oopptr();
803 bool is_instance = (tinst != NULL) && tinst->is_known_instance();
804 Node *start_mem = C->start()->proj_out(TypeFunc::Memory);
805 Node *prev = NULL;
806 Node *result = orig_mem;
807 while (prev != result) {
808 prev = result;
809 if (result == start_mem)
810 break; // hit one of our sentinels
811 if (result->is_Mem()) {
812 const Type *at = phase->type(result->in(MemNode::Address));
813 if (at != Type::TOP) {
814 assert (at->isa_ptr() != NULL, "pointer type required.");
815 int idx = C->get_alias_index(at->is_ptr());
816 if (idx == alias_idx)
817 break;
818 }
819 result = result->in(MemNode::Memory);
820 }
821 if (!is_instance)
822 continue; // don't search further for non-instance types
823 // skip over a call which does not affect this memory slice
824 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) {
825 Node *proj_in = result->in(0);
826 if (proj_in->is_Allocate() && proj_in->_idx == (uint)tinst->instance_id()) {
827 break; // hit one of our sentinels
828 } else if (proj_in->is_Call()) {
829 CallNode *call = proj_in->as_Call();
830 if (!call->may_modify(tinst, phase)) {
831 result = call->in(TypeFunc::Memory);
832 }
833 } else if (proj_in->is_Initialize()) {
834 AllocateNode* alloc = proj_in->as_Initialize()->allocation();
835 // Stop if this is the initialization for the object instance which
836 // which contains this memory slice, otherwise skip over it.
837 if (alloc == NULL || alloc->_idx != (uint)tinst->instance_id()) {
838 result = proj_in->in(TypeFunc::Memory);
839 }
840 } else if (proj_in->is_MemBar()) {
841 result = proj_in->in(TypeFunc::Memory);
842 }
843 } else if (result->is_MergeMem()) {
844 MergeMemNode *mmem = result->as_MergeMem();
845 result = step_through_mergemem(mmem, alias_idx, tinst);
846 if (result == mmem->base_memory()) {
847 // Didn't find instance memory, search through general slice recursively.
848 result = mmem->memory_at(C->get_general_index(alias_idx));
849 result = find_inst_mem(result, alias_idx, orig_phis, phase);
850 if (C->failing()) {
851 return NULL;
852 }
853 mmem->set_memory_at(alias_idx, result);
854 }
855 } else if (result->is_Phi() &&
856 C->get_alias_index(result->as_Phi()->adr_type()) != alias_idx) {
857 Node *un = result->as_Phi()->unique_input(phase);
858 if (un != NULL) {
859 orig_phis.append_if_missing(result->as_Phi());
860 result = un;
861 } else {
862 break;
863 }
864 } else if (result->is_ClearArray()) {
865 if (!ClearArrayNode::step_through(&result, (uint)tinst->instance_id(), phase)) {
866 // Can not bypass initialization of the instance
867 // we are looking for.
868 break;
869 }
870 // Otherwise skip it (the call updated 'result' value).
871 } else if (result->Opcode() == Op_SCMemProj) {
872 assert(result->in(0)->is_LoadStore(), "sanity");
873 const Type *at = phase->type(result->in(0)->in(MemNode::Address));
874 if (at != Type::TOP) {
875 assert (at->isa_ptr() != NULL, "pointer type required.");
876 int idx = C->get_alias_index(at->is_ptr());
877 assert(idx != alias_idx, "Object is not scalar replaceable if a LoadStore node access its field");
878 break;
879 }
880 result = result->in(0)->in(MemNode::Memory);
881 }
882 }
883 if (result->is_Phi()) {
884 PhiNode *mphi = result->as_Phi();
885 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required");
886 const TypePtr *t = mphi->adr_type();
887 if (C->get_alias_index(t) != alias_idx) {
888 // Create a new Phi with the specified alias index type.
889 result = split_memory_phi(mphi, alias_idx, orig_phis, phase);
890 } else if (!is_instance) {
891 // Push all non-instance Phis on the orig_phis worklist to update inputs
892 // during Phase 4 if needed.
893 orig_phis.append_if_missing(mphi);
894 }
895 }
896 // the result is either MemNode, PhiNode, InitializeNode.
897 return result;
898 }
900 //
901 // Convert the types of unescaped object to instance types where possible,
902 // propagate the new type information through the graph, and update memory
903 // edges and MergeMem inputs to reflect the new type.
904 //
905 // We start with allocations (and calls which may be allocations) on alloc_worklist.
906 // The processing is done in 4 phases:
907 //
908 // Phase 1: Process possible allocations from alloc_worklist. Create instance
909 // types for the CheckCastPP for allocations where possible.
910 // Propagate the the new types through users as follows:
911 // casts and Phi: push users on alloc_worklist
912 // AddP: cast Base and Address inputs to the instance type
913 // push any AddP users on alloc_worklist and push any memnode
914 // users onto memnode_worklist.
915 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and
916 // search the Memory chain for a store with the appropriate type
917 // address type. If a Phi is found, create a new version with
918 // the appropriate memory slices from each of the Phi inputs.
919 // For stores, process the users as follows:
920 // MemNode: push on memnode_worklist
921 // MergeMem: push on mergemem_worklist
922 // Phase 3: Process MergeMem nodes from mergemem_worklist. Walk each memory slice
923 // moving the first node encountered of each instance type to the
924 // the input corresponding to its alias index.
925 // appropriate memory slice.
926 // Phase 4: Update the inputs of non-instance memory Phis and the Memory input of memnodes.
927 //
928 // In the following example, the CheckCastPP nodes are the cast of allocation
929 // results and the allocation of node 29 is unescaped and eligible to be an
930 // instance type.
931 //
932 // We start with:
933 //
934 // 7 Parm #memory
935 // 10 ConI "12"
936 // 19 CheckCastPP "Foo"
937 // 20 AddP _ 19 19 10 Foo+12 alias_index=4
938 // 29 CheckCastPP "Foo"
939 // 30 AddP _ 29 29 10 Foo+12 alias_index=4
940 //
941 // 40 StoreP 25 7 20 ... alias_index=4
942 // 50 StoreP 35 40 30 ... alias_index=4
943 // 60 StoreP 45 50 20 ... alias_index=4
944 // 70 LoadP _ 60 30 ... alias_index=4
945 // 80 Phi 75 50 60 Memory alias_index=4
946 // 90 LoadP _ 80 30 ... alias_index=4
947 // 100 LoadP _ 80 20 ... alias_index=4
948 //
949 //
950 // Phase 1 creates an instance type for node 29 assigning it an instance id of 24
951 // and creating a new alias index for node 30. This gives:
952 //
953 // 7 Parm #memory
954 // 10 ConI "12"
955 // 19 CheckCastPP "Foo"
956 // 20 AddP _ 19 19 10 Foo+12 alias_index=4
957 // 29 CheckCastPP "Foo" iid=24
958 // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24
959 //
960 // 40 StoreP 25 7 20 ... alias_index=4
961 // 50 StoreP 35 40 30 ... alias_index=6
962 // 60 StoreP 45 50 20 ... alias_index=4
963 // 70 LoadP _ 60 30 ... alias_index=6
964 // 80 Phi 75 50 60 Memory alias_index=4
965 // 90 LoadP _ 80 30 ... alias_index=6
966 // 100 LoadP _ 80 20 ... alias_index=4
967 //
968 // In phase 2, new memory inputs are computed for the loads and stores,
969 // And a new version of the phi is created. In phase 4, the inputs to
970 // node 80 are updated and then the memory nodes are updated with the
971 // values computed in phase 2. This results in:
972 //
973 // 7 Parm #memory
974 // 10 ConI "12"
975 // 19 CheckCastPP "Foo"
976 // 20 AddP _ 19 19 10 Foo+12 alias_index=4
977 // 29 CheckCastPP "Foo" iid=24
978 // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24
979 //
980 // 40 StoreP 25 7 20 ... alias_index=4
981 // 50 StoreP 35 7 30 ... alias_index=6
982 // 60 StoreP 45 40 20 ... alias_index=4
983 // 70 LoadP _ 50 30 ... alias_index=6
984 // 80 Phi 75 40 60 Memory alias_index=4
985 // 120 Phi 75 50 50 Memory alias_index=6
986 // 90 LoadP _ 120 30 ... alias_index=6
987 // 100 LoadP _ 80 20 ... alias_index=4
988 //
989 void ConnectionGraph::split_unique_types(GrowableArray<Node *> &alloc_worklist) {
990 GrowableArray<Node *> memnode_worklist;
991 GrowableArray<PhiNode *> orig_phis;
993 PhaseGVN *igvn = _compile->initial_gvn();
994 uint new_index_start = (uint) _compile->num_alias_types();
995 Arena* arena = Thread::current()->resource_area();
996 VectorSet visited(arena);
997 VectorSet ptset(arena);
1000 // Phase 1: Process possible allocations from alloc_worklist.
1001 // Create instance types for the CheckCastPP for allocations where possible.
1002 //
1003 // (Note: don't forget to change the order of the second AddP node on
1004 // the alloc_worklist if the order of the worklist processing is changed,
1005 // see the comment in find_second_addp().)
1006 //
1007 while (alloc_worklist.length() != 0) {
1008 Node *n = alloc_worklist.pop();
1009 uint ni = n->_idx;
1010 const TypeOopPtr* tinst = NULL;
1011 if (n->is_Call()) {
1012 CallNode *alloc = n->as_Call();
1013 // copy escape information to call node
1014 PointsToNode* ptn = ptnode_adr(alloc->_idx);
1015 PointsToNode::EscapeState es = escape_state(alloc, igvn);
1016 // We have an allocation or call which returns a Java object,
1017 // see if it is unescaped.
1018 if (es != PointsToNode::NoEscape || !ptn->_scalar_replaceable)
1019 continue;
1021 // Find CheckCastPP for the allocate or for the return value of a call
1022 n = alloc->result_cast();
1023 if (n == NULL) { // No uses except Initialize node
1024 if (alloc->is_Allocate()) {
1025 // Set the scalar_replaceable flag for allocation
1026 // so it could be eliminated if it has no uses.
1027 alloc->as_Allocate()->_is_scalar_replaceable = true;
1028 }
1029 continue;
1030 }
1031 if (!n->is_CheckCastPP()) { // not unique CheckCastPP.
1032 assert(!alloc->is_Allocate(), "allocation should have unique type");
1033 continue;
1034 }
1036 // The inline code for Object.clone() casts the allocation result to
1037 // java.lang.Object and then to the actual type of the allocated
1038 // object. Detect this case and use the second cast.
1039 // Also detect j.l.reflect.Array.newInstance(jobject, jint) case when
1040 // the allocation result is cast to java.lang.Object and then
1041 // to the actual Array type.
1042 if (alloc->is_Allocate() && n->as_Type()->type() == TypeInstPtr::NOTNULL
1043 && (alloc->is_AllocateArray() ||
1044 igvn->type(alloc->in(AllocateNode::KlassNode)) != TypeKlassPtr::OBJECT)) {
1045 Node *cast2 = NULL;
1046 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
1047 Node *use = n->fast_out(i);
1048 if (use->is_CheckCastPP()) {
1049 cast2 = use;
1050 break;
1051 }
1052 }
1053 if (cast2 != NULL) {
1054 n = cast2;
1055 } else {
1056 // Non-scalar replaceable if the allocation type is unknown statically
1057 // (reflection allocation), the object can't be restored during
1058 // deoptimization without precise type.
1059 continue;
1060 }
1061 }
1062 if (alloc->is_Allocate()) {
1063 // Set the scalar_replaceable flag for allocation
1064 // so it could be eliminated.
1065 alloc->as_Allocate()->_is_scalar_replaceable = true;
1066 }
1067 set_escape_state(n->_idx, es);
1068 // in order for an object to be scalar-replaceable, it must be:
1069 // - a direct allocation (not a call returning an object)
1070 // - non-escaping
1071 // - eligible to be a unique type
1072 // - not determined to be ineligible by escape analysis
1073 assert(ptnode_adr(alloc->_idx)->_node != NULL &&
1074 ptnode_adr(n->_idx)->_node != NULL, "should be registered");
1075 set_map(alloc->_idx, n);
1076 set_map(n->_idx, alloc);
1077 const TypeOopPtr *t = igvn->type(n)->isa_oopptr();
1078 if (t == NULL)
1079 continue; // not a TypeInstPtr
1080 tinst = t->cast_to_exactness(true)->is_oopptr()->cast_to_instance_id(ni);
1081 igvn->hash_delete(n);
1082 igvn->set_type(n, tinst);
1083 n->raise_bottom_type(tinst);
1084 igvn->hash_insert(n);
1085 record_for_optimizer(n);
1086 if (alloc->is_Allocate() && ptn->_scalar_replaceable &&
1087 (t->isa_instptr() || t->isa_aryptr())) {
1089 // First, put on the worklist all Field edges from Connection Graph
1090 // which is more accurate then putting immediate users from Ideal Graph.
1091 for (uint e = 0; e < ptn->edge_count(); e++) {
1092 Node *use = ptnode_adr(ptn->edge_target(e))->_node;
1093 assert(ptn->edge_type(e) == PointsToNode::FieldEdge && use->is_AddP(),
1094 "only AddP nodes are Field edges in CG");
1095 if (use->outcnt() > 0) { // Don't process dead nodes
1096 Node* addp2 = find_second_addp(use, use->in(AddPNode::Base));
1097 if (addp2 != NULL) {
1098 assert(alloc->is_AllocateArray(),"array allocation was expected");
1099 alloc_worklist.append_if_missing(addp2);
1100 }
1101 alloc_worklist.append_if_missing(use);
1102 }
1103 }
1105 // An allocation may have an Initialize which has raw stores. Scan
1106 // the users of the raw allocation result and push AddP users
1107 // on alloc_worklist.
1108 Node *raw_result = alloc->proj_out(TypeFunc::Parms);
1109 assert (raw_result != NULL, "must have an allocation result");
1110 for (DUIterator_Fast imax, i = raw_result->fast_outs(imax); i < imax; i++) {
1111 Node *use = raw_result->fast_out(i);
1112 if (use->is_AddP() && use->outcnt() > 0) { // Don't process dead nodes
1113 Node* addp2 = find_second_addp(use, raw_result);
1114 if (addp2 != NULL) {
1115 assert(alloc->is_AllocateArray(),"array allocation was expected");
1116 alloc_worklist.append_if_missing(addp2);
1117 }
1118 alloc_worklist.append_if_missing(use);
1119 } else if (use->is_MemBar()) {
1120 memnode_worklist.append_if_missing(use);
1121 }
1122 }
1123 }
1124 } else if (n->is_AddP()) {
1125 ptset.Clear();
1126 PointsTo(ptset, get_addp_base(n), igvn);
1127 assert(ptset.Size() == 1, "AddP address is unique");
1128 uint elem = ptset.getelem(); // Allocation node's index
1129 if (elem == _phantom_object) {
1130 assert(false, "escaped allocation");
1131 continue; // Assume the value was set outside this method.
1132 }
1133 Node *base = get_map(elem); // CheckCastPP node
1134 if (!split_AddP(n, base, igvn)) continue; // wrong type from dead path
1135 tinst = igvn->type(base)->isa_oopptr();
1136 } else if (n->is_Phi() ||
1137 n->is_CheckCastPP() ||
1138 n->is_EncodeP() ||
1139 n->is_DecodeN() ||
1140 (n->is_ConstraintCast() && n->Opcode() == Op_CastPP)) {
1141 if (visited.test_set(n->_idx)) {
1142 assert(n->is_Phi(), "loops only through Phi's");
1143 continue; // already processed
1144 }
1145 ptset.Clear();
1146 PointsTo(ptset, n, igvn);
1147 if (ptset.Size() == 1) {
1148 uint elem = ptset.getelem(); // Allocation node's index
1149 if (elem == _phantom_object) {
1150 assert(false, "escaped allocation");
1151 continue; // Assume the value was set outside this method.
1152 }
1153 Node *val = get_map(elem); // CheckCastPP node
1154 TypeNode *tn = n->as_Type();
1155 tinst = igvn->type(val)->isa_oopptr();
1156 assert(tinst != NULL && tinst->is_known_instance() &&
1157 (uint)tinst->instance_id() == elem , "instance type expected.");
1159 const Type *tn_type = igvn->type(tn);
1160 const TypeOopPtr *tn_t;
1161 if (tn_type->isa_narrowoop()) {
1162 tn_t = tn_type->make_ptr()->isa_oopptr();
1163 } else {
1164 tn_t = tn_type->isa_oopptr();
1165 }
1167 if (tn_t != NULL && tinst->klass()->is_subtype_of(tn_t->klass())) {
1168 if (tn_type->isa_narrowoop()) {
1169 tn_type = tinst->make_narrowoop();
1170 } else {
1171 tn_type = tinst;
1172 }
1173 igvn->hash_delete(tn);
1174 igvn->set_type(tn, tn_type);
1175 tn->set_type(tn_type);
1176 igvn->hash_insert(tn);
1177 record_for_optimizer(n);
1178 } else {
1179 assert(tn_type == TypePtr::NULL_PTR ||
1180 tn_t != NULL && !tinst->klass()->is_subtype_of(tn_t->klass()),
1181 "unexpected type");
1182 continue; // Skip dead path with different type
1183 }
1184 }
1185 } else {
1186 debug_only(n->dump();)
1187 assert(false, "EA: unexpected node");
1188 continue;
1189 }
1190 // push allocation's users on appropriate worklist
1191 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
1192 Node *use = n->fast_out(i);
1193 if(use->is_Mem() && use->in(MemNode::Address) == n) {
1194 // Load/store to instance's field
1195 memnode_worklist.append_if_missing(use);
1196 } else if (use->is_MemBar()) {
1197 memnode_worklist.append_if_missing(use);
1198 } else if (use->is_AddP() && use->outcnt() > 0) { // No dead nodes
1199 Node* addp2 = find_second_addp(use, n);
1200 if (addp2 != NULL) {
1201 alloc_worklist.append_if_missing(addp2);
1202 }
1203 alloc_worklist.append_if_missing(use);
1204 } else if (use->is_Phi() ||
1205 use->is_CheckCastPP() ||
1206 use->is_EncodeP() ||
1207 use->is_DecodeN() ||
1208 (use->is_ConstraintCast() && use->Opcode() == Op_CastPP)) {
1209 alloc_worklist.append_if_missing(use);
1210 #ifdef ASSERT
1211 } else if (use->is_Mem()) {
1212 assert(use->in(MemNode::Address) != n, "EA: missing allocation reference path");
1213 } else if (use->is_MergeMem()) {
1214 assert(_mergemem_worklist.contains(use->as_MergeMem()), "EA: missing MergeMem node in the worklist");
1215 } else if (use->is_SafePoint()) {
1216 // Look for MergeMem nodes for calls which reference unique allocation
1217 // (through CheckCastPP nodes) even for debug info.
1218 Node* m = use->in(TypeFunc::Memory);
1219 if (m->is_MergeMem()) {
1220 assert(_mergemem_worklist.contains(m->as_MergeMem()), "EA: missing MergeMem node in the worklist");
1221 }
1222 } else {
1223 uint op = use->Opcode();
1224 if (!(op == Op_CmpP || op == Op_Conv2B ||
1225 op == Op_CastP2X || op == Op_StoreCM ||
1226 op == Op_FastLock || op == Op_AryEq || op == Op_StrComp ||
1227 op == Op_StrEquals || op == Op_StrIndexOf)) {
1228 n->dump();
1229 use->dump();
1230 assert(false, "EA: missing allocation reference path");
1231 }
1232 #endif
1233 }
1234 }
1236 }
1237 // New alias types were created in split_AddP().
1238 uint new_index_end = (uint) _compile->num_alias_types();
1240 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and
1241 // compute new values for Memory inputs (the Memory inputs are not
1242 // actually updated until phase 4.)
1243 if (memnode_worklist.length() == 0)
1244 return; // nothing to do
1246 while (memnode_worklist.length() != 0) {
1247 Node *n = memnode_worklist.pop();
1248 if (visited.test_set(n->_idx))
1249 continue;
1250 if (n->is_Phi() || n->is_ClearArray()) {
1251 // we don't need to do anything, but the users must be pushed
1252 } else if (n->is_MemBar()) { // Initialize, MemBar nodes
1253 // we don't need to do anything, but the users must be pushed
1254 n = n->as_MemBar()->proj_out(TypeFunc::Memory);
1255 if (n == NULL)
1256 continue;
1257 } else {
1258 assert(n->is_Mem(), "memory node required.");
1259 Node *addr = n->in(MemNode::Address);
1260 const Type *addr_t = igvn->type(addr);
1261 if (addr_t == Type::TOP)
1262 continue;
1263 assert (addr_t->isa_ptr() != NULL, "pointer type required.");
1264 int alias_idx = _compile->get_alias_index(addr_t->is_ptr());
1265 assert ((uint)alias_idx < new_index_end, "wrong alias index");
1266 Node *mem = find_inst_mem(n->in(MemNode::Memory), alias_idx, orig_phis, igvn);
1267 if (_compile->failing()) {
1268 return;
1269 }
1270 if (mem != n->in(MemNode::Memory)) {
1271 // We delay the memory edge update since we need old one in
1272 // MergeMem code below when instances memory slices are separated.
1273 debug_only(Node* pn = ptnode_adr(n->_idx)->_node;)
1274 assert(pn == NULL || pn == n, "wrong node");
1275 set_map(n->_idx, mem);
1276 ptnode_adr(n->_idx)->_node = n;
1277 }
1278 if (n->is_Load()) {
1279 continue; // don't push users
1280 } else if (n->is_LoadStore()) {
1281 // get the memory projection
1282 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
1283 Node *use = n->fast_out(i);
1284 if (use->Opcode() == Op_SCMemProj) {
1285 n = use;
1286 break;
1287 }
1288 }
1289 assert(n->Opcode() == Op_SCMemProj, "memory projection required");
1290 }
1291 }
1292 // push user on appropriate worklist
1293 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
1294 Node *use = n->fast_out(i);
1295 if (use->is_Phi() || use->is_ClearArray()) {
1296 memnode_worklist.append_if_missing(use);
1297 } else if(use->is_Mem() && use->in(MemNode::Memory) == n) {
1298 if (use->Opcode() == Op_StoreCM) // Ignore cardmark stores
1299 continue;
1300 memnode_worklist.append_if_missing(use);
1301 } else if (use->is_MemBar()) {
1302 memnode_worklist.append_if_missing(use);
1303 #ifdef ASSERT
1304 } else if(use->is_Mem()) {
1305 assert(use->in(MemNode::Memory) != n, "EA: missing memory path");
1306 } else if (use->is_MergeMem()) {
1307 assert(_mergemem_worklist.contains(use->as_MergeMem()), "EA: missing MergeMem node in the worklist");
1308 } else {
1309 uint op = use->Opcode();
1310 if (!(op == Op_StoreCM ||
1311 (op == Op_CallLeaf && use->as_CallLeaf()->_name != NULL &&
1312 strcmp(use->as_CallLeaf()->_name, "g1_wb_pre") == 0) ||
1313 op == Op_AryEq || op == Op_StrComp ||
1314 op == Op_StrEquals || op == Op_StrIndexOf)) {
1315 n->dump();
1316 use->dump();
1317 assert(false, "EA: missing memory path");
1318 }
1319 #endif
1320 }
1321 }
1322 }
1324 // Phase 3: Process MergeMem nodes from mergemem_worklist.
1325 // Walk each memory slice moving the first node encountered of each
1326 // instance type to the the input corresponding to its alias index.
1327 uint length = _mergemem_worklist.length();
1328 for( uint next = 0; next < length; ++next ) {
1329 MergeMemNode* nmm = _mergemem_worklist.at(next);
1330 assert(!visited.test_set(nmm->_idx), "should not be visited before");
1331 // Note: we don't want to use MergeMemStream here because we only want to
1332 // scan inputs which exist at the start, not ones we add during processing.
1333 // Note 2: MergeMem may already contains instance memory slices added
1334 // during find_inst_mem() call when memory nodes were processed above.
1335 igvn->hash_delete(nmm);
1336 uint nslices = nmm->req();
1337 for (uint i = Compile::AliasIdxRaw+1; i < nslices; i++) {
1338 Node* mem = nmm->in(i);
1339 Node* cur = NULL;
1340 if (mem == NULL || mem->is_top())
1341 continue;
1342 // First, update mergemem by moving memory nodes to corresponding slices
1343 // if their type became more precise since this mergemem was created.
1344 while (mem->is_Mem()) {
1345 const Type *at = igvn->type(mem->in(MemNode::Address));
1346 if (at != Type::TOP) {
1347 assert (at->isa_ptr() != NULL, "pointer type required.");
1348 uint idx = (uint)_compile->get_alias_index(at->is_ptr());
1349 if (idx == i) {
1350 if (cur == NULL)
1351 cur = mem;
1352 } else {
1353 if (idx >= nmm->req() || nmm->is_empty_memory(nmm->in(idx))) {
1354 nmm->set_memory_at(idx, mem);
1355 }
1356 }
1357 }
1358 mem = mem->in(MemNode::Memory);
1359 }
1360 nmm->set_memory_at(i, (cur != NULL) ? cur : mem);
1361 // Find any instance of the current type if we haven't encountered
1362 // already a memory slice of the instance along the memory chain.
1363 for (uint ni = new_index_start; ni < new_index_end; ni++) {
1364 if((uint)_compile->get_general_index(ni) == i) {
1365 Node *m = (ni >= nmm->req()) ? nmm->empty_memory() : nmm->in(ni);
1366 if (nmm->is_empty_memory(m)) {
1367 Node* result = find_inst_mem(mem, ni, orig_phis, igvn);
1368 if (_compile->failing()) {
1369 return;
1370 }
1371 nmm->set_memory_at(ni, result);
1372 }
1373 }
1374 }
1375 }
1376 // Find the rest of instances values
1377 for (uint ni = new_index_start; ni < new_index_end; ni++) {
1378 const TypeOopPtr *tinst = _compile->get_adr_type(ni)->isa_oopptr();
1379 Node* result = step_through_mergemem(nmm, ni, tinst);
1380 if (result == nmm->base_memory()) {
1381 // Didn't find instance memory, search through general slice recursively.
1382 result = nmm->memory_at(_compile->get_general_index(ni));
1383 result = find_inst_mem(result, ni, orig_phis, igvn);
1384 if (_compile->failing()) {
1385 return;
1386 }
1387 nmm->set_memory_at(ni, result);
1388 }
1389 }
1390 igvn->hash_insert(nmm);
1391 record_for_optimizer(nmm);
1392 }
1394 // Phase 4: Update the inputs of non-instance memory Phis and
1395 // the Memory input of memnodes
1396 // First update the inputs of any non-instance Phi's from
1397 // which we split out an instance Phi. Note we don't have
1398 // to recursively process Phi's encounted on the input memory
1399 // chains as is done in split_memory_phi() since they will
1400 // also be processed here.
1401 for (int j = 0; j < orig_phis.length(); j++) {
1402 PhiNode *phi = orig_phis.at(j);
1403 int alias_idx = _compile->get_alias_index(phi->adr_type());
1404 igvn->hash_delete(phi);
1405 for (uint i = 1; i < phi->req(); i++) {
1406 Node *mem = phi->in(i);
1407 Node *new_mem = find_inst_mem(mem, alias_idx, orig_phis, igvn);
1408 if (_compile->failing()) {
1409 return;
1410 }
1411 if (mem != new_mem) {
1412 phi->set_req(i, new_mem);
1413 }
1414 }
1415 igvn->hash_insert(phi);
1416 record_for_optimizer(phi);
1417 }
1419 // Update the memory inputs of MemNodes with the value we computed
1420 // in Phase 2 and move stores memory users to corresponding memory slices.
1421 #ifdef ASSERT
1422 visited.Clear();
1423 Node_Stack old_mems(arena, _compile->unique() >> 2);
1424 #endif
1425 for (uint i = 0; i < nodes_size(); i++) {
1426 Node *nmem = get_map(i);
1427 if (nmem != NULL) {
1428 Node *n = ptnode_adr(i)->_node;
1429 assert(n != NULL, "sanity");
1430 if (n->is_Mem()) {
1431 #ifdef ASSERT
1432 Node* old_mem = n->in(MemNode::Memory);
1433 if (!visited.test_set(old_mem->_idx)) {
1434 old_mems.push(old_mem, old_mem->outcnt());
1435 }
1436 #endif
1437 assert(n->in(MemNode::Memory) != nmem, "sanity");
1438 if (!n->is_Load()) {
1439 // Move memory users of a store first.
1440 move_inst_mem(n, orig_phis, igvn);
1441 }
1442 // Now update memory input
1443 igvn->hash_delete(n);
1444 n->set_req(MemNode::Memory, nmem);
1445 igvn->hash_insert(n);
1446 record_for_optimizer(n);
1447 } else {
1448 assert(n->is_Allocate() || n->is_CheckCastPP() ||
1449 n->is_AddP() || n->is_Phi(), "unknown node used for set_map()");
1450 }
1451 }
1452 }
1453 #ifdef ASSERT
1454 // Verify that memory was split correctly
1455 while (old_mems.is_nonempty()) {
1456 Node* old_mem = old_mems.node();
1457 uint old_cnt = old_mems.index();
1458 old_mems.pop();
1459 assert(old_cnt = old_mem->outcnt(), "old mem could be lost");
1460 }
1461 #endif
1462 }
1464 bool ConnectionGraph::has_candidates(Compile *C) {
1465 // EA brings benefits only when the code has allocations and/or locks which
1466 // are represented by ideal Macro nodes.
1467 int cnt = C->macro_count();
1468 for( int i=0; i < cnt; i++ ) {
1469 Node *n = C->macro_node(i);
1470 if ( n->is_Allocate() )
1471 return true;
1472 if( n->is_Lock() ) {
1473 Node* obj = n->as_Lock()->obj_node()->uncast();
1474 if( !(obj->is_Parm() || obj->is_Con()) )
1475 return true;
1476 }
1477 }
1478 return false;
1479 }
1481 bool ConnectionGraph::compute_escape() {
1482 Compile* C = _compile;
1484 // 1. Populate Connection Graph (CG) with Ideal nodes.
1486 Unique_Node_List worklist_init;
1487 worklist_init.map(C->unique(), NULL); // preallocate space
1489 // Initialize worklist
1490 if (C->root() != NULL) {
1491 worklist_init.push(C->root());
1492 }
1494 GrowableArray<int> cg_worklist;
1495 PhaseGVN* igvn = C->initial_gvn();
1496 bool has_allocations = false;
1498 // Push all useful nodes onto CG list and set their type.
1499 for( uint next = 0; next < worklist_init.size(); ++next ) {
1500 Node* n = worklist_init.at(next);
1501 record_for_escape_analysis(n, igvn);
1502 // Only allocations and java static calls results are checked
1503 // for an escape status. See process_call_result() below.
1504 if (n->is_Allocate() || n->is_CallStaticJava() &&
1505 ptnode_adr(n->_idx)->node_type() == PointsToNode::JavaObject) {
1506 has_allocations = true;
1507 }
1508 if(n->is_AddP()) {
1509 // Collect address nodes which directly reference an allocation.
1510 // Use them during stage 3 below to build initial connection graph
1511 // field edges. Other field edges could be added after StoreP/LoadP
1512 // nodes are processed during stage 4 below.
1513 Node* base = get_addp_base(n);
1514 if(base->is_Proj() && base->in(0)->is_Allocate()) {
1515 cg_worklist.append(n->_idx);
1516 }
1517 } else if (n->is_MergeMem()) {
1518 // Collect all MergeMem nodes to add memory slices for
1519 // scalar replaceable objects in split_unique_types().
1520 _mergemem_worklist.append(n->as_MergeMem());
1521 }
1522 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
1523 Node* m = n->fast_out(i); // Get user
1524 worklist_init.push(m);
1525 }
1526 }
1528 if (!has_allocations) {
1529 _collecting = false;
1530 return false; // Nothing to do.
1531 }
1533 // 2. First pass to create simple CG edges (doesn't require to walk CG).
1534 uint delayed_size = _delayed_worklist.size();
1535 for( uint next = 0; next < delayed_size; ++next ) {
1536 Node* n = _delayed_worklist.at(next);
1537 build_connection_graph(n, igvn);
1538 }
1540 // 3. Pass to create fields edges (Allocate -F-> AddP).
1541 uint cg_length = cg_worklist.length();
1542 for( uint next = 0; next < cg_length; ++next ) {
1543 int ni = cg_worklist.at(next);
1544 build_connection_graph(ptnode_adr(ni)->_node, igvn);
1545 }
1547 cg_worklist.clear();
1548 cg_worklist.append(_phantom_object);
1550 // 4. Build Connection Graph which need
1551 // to walk the connection graph.
1552 for (uint ni = 0; ni < nodes_size(); ni++) {
1553 PointsToNode* ptn = ptnode_adr(ni);
1554 Node *n = ptn->_node;
1555 if (n != NULL) { // Call, AddP, LoadP, StoreP
1556 build_connection_graph(n, igvn);
1557 if (ptn->node_type() != PointsToNode::UnknownType)
1558 cg_worklist.append(n->_idx); // Collect CG nodes
1559 }
1560 }
1562 Arena* arena = Thread::current()->resource_area();
1563 VectorSet ptset(arena);
1564 GrowableArray<uint> deferred_edges;
1565 VectorSet visited(arena);
1567 // 5. Remove deferred edges from the graph and adjust
1568 // escape state of nonescaping objects.
1569 cg_length = cg_worklist.length();
1570 for( uint next = 0; next < cg_length; ++next ) {
1571 int ni = cg_worklist.at(next);
1572 PointsToNode* ptn = ptnode_adr(ni);
1573 PointsToNode::NodeType nt = ptn->node_type();
1574 if (nt == PointsToNode::LocalVar || nt == PointsToNode::Field) {
1575 remove_deferred(ni, &deferred_edges, &visited);
1576 Node *n = ptn->_node;
1577 if (n->is_AddP()) {
1578 // Search for objects which are not scalar replaceable
1579 // and adjust their escape state.
1580 verify_escape_state(ni, ptset, igvn);
1581 }
1582 }
1583 }
1585 // 6. Propagate escape states.
1586 GrowableArray<int> worklist;
1587 bool has_non_escaping_obj = false;
1589 // push all GlobalEscape nodes on the worklist
1590 for( uint next = 0; next < cg_length; ++next ) {
1591 int nk = cg_worklist.at(next);
1592 if (ptnode_adr(nk)->escape_state() == PointsToNode::GlobalEscape)
1593 worklist.push(nk);
1594 }
1595 // mark all nodes reachable from GlobalEscape nodes
1596 while(worklist.length() > 0) {
1597 PointsToNode* ptn = ptnode_adr(worklist.pop());
1598 uint e_cnt = ptn->edge_count();
1599 for (uint ei = 0; ei < e_cnt; ei++) {
1600 uint npi = ptn->edge_target(ei);
1601 PointsToNode *np = ptnode_adr(npi);
1602 if (np->escape_state() < PointsToNode::GlobalEscape) {
1603 np->set_escape_state(PointsToNode::GlobalEscape);
1604 worklist.push(npi);
1605 }
1606 }
1607 }
1609 // push all ArgEscape nodes on the worklist
1610 for( uint next = 0; next < cg_length; ++next ) {
1611 int nk = cg_worklist.at(next);
1612 if (ptnode_adr(nk)->escape_state() == PointsToNode::ArgEscape)
1613 worklist.push(nk);
1614 }
1615 // mark all nodes reachable from ArgEscape nodes
1616 while(worklist.length() > 0) {
1617 PointsToNode* ptn = ptnode_adr(worklist.pop());
1618 if (ptn->node_type() == PointsToNode::JavaObject)
1619 has_non_escaping_obj = true; // Non GlobalEscape
1620 uint e_cnt = ptn->edge_count();
1621 for (uint ei = 0; ei < e_cnt; ei++) {
1622 uint npi = ptn->edge_target(ei);
1623 PointsToNode *np = ptnode_adr(npi);
1624 if (np->escape_state() < PointsToNode::ArgEscape) {
1625 np->set_escape_state(PointsToNode::ArgEscape);
1626 worklist.push(npi);
1627 }
1628 }
1629 }
1631 GrowableArray<Node*> alloc_worklist;
1633 // push all NoEscape nodes on the worklist
1634 for( uint next = 0; next < cg_length; ++next ) {
1635 int nk = cg_worklist.at(next);
1636 if (ptnode_adr(nk)->escape_state() == PointsToNode::NoEscape)
1637 worklist.push(nk);
1638 }
1639 // mark all nodes reachable from NoEscape nodes
1640 while(worklist.length() > 0) {
1641 PointsToNode* ptn = ptnode_adr(worklist.pop());
1642 if (ptn->node_type() == PointsToNode::JavaObject)
1643 has_non_escaping_obj = true; // Non GlobalEscape
1644 Node* n = ptn->_node;
1645 if (n->is_Allocate() && ptn->_scalar_replaceable ) {
1646 // Push scalar replaceable allocations on alloc_worklist
1647 // for processing in split_unique_types().
1648 alloc_worklist.append(n);
1649 }
1650 uint e_cnt = ptn->edge_count();
1651 for (uint ei = 0; ei < e_cnt; ei++) {
1652 uint npi = ptn->edge_target(ei);
1653 PointsToNode *np = ptnode_adr(npi);
1654 if (np->escape_state() < PointsToNode::NoEscape) {
1655 np->set_escape_state(PointsToNode::NoEscape);
1656 worklist.push(npi);
1657 }
1658 }
1659 }
1661 _collecting = false;
1662 assert(C->unique() == nodes_size(), "there should be no new ideal nodes during ConnectionGraph build");
1664 bool has_scalar_replaceable_candidates = alloc_worklist.length() > 0;
1665 if ( has_scalar_replaceable_candidates &&
1666 C->AliasLevel() >= 3 && EliminateAllocations ) {
1668 // Now use the escape information to create unique types for
1669 // scalar replaceable objects.
1670 split_unique_types(alloc_worklist);
1672 if (C->failing()) return false;
1674 // Clean up after split unique types.
1675 ResourceMark rm;
1676 PhaseRemoveUseless pru(C->initial_gvn(), C->for_igvn());
1678 C->print_method("After Escape Analysis", 2);
1680 #ifdef ASSERT
1681 } else if (Verbose && (PrintEscapeAnalysis || PrintEliminateAllocations)) {
1682 tty->print("=== No allocations eliminated for ");
1683 C->method()->print_short_name();
1684 if(!EliminateAllocations) {
1685 tty->print(" since EliminateAllocations is off ===");
1686 } else if(!has_scalar_replaceable_candidates) {
1687 tty->print(" since there are no scalar replaceable candidates ===");
1688 } else if(C->AliasLevel() < 3) {
1689 tty->print(" since AliasLevel < 3 ===");
1690 }
1691 tty->cr();
1692 #endif
1693 }
1694 return has_non_escaping_obj;
1695 }
1697 // Search for objects which are not scalar replaceable.
1698 void ConnectionGraph::verify_escape_state(int nidx, VectorSet& ptset, PhaseTransform* phase) {
1699 PointsToNode* ptn = ptnode_adr(nidx);
1700 Node* n = ptn->_node;
1701 assert(n->is_AddP(), "Should be called for AddP nodes only");
1702 // Search for objects which are not scalar replaceable.
1703 // Mark their escape state as ArgEscape to propagate the state
1704 // to referenced objects.
1705 // Note: currently there are no difference in compiler optimizations
1706 // for ArgEscape objects and NoEscape objects which are not
1707 // scalar replaceable.
1709 Compile* C = _compile;
1711 int offset = ptn->offset();
1712 Node* base = get_addp_base(n);
1713 ptset.Clear();
1714 PointsTo(ptset, base, phase);
1715 int ptset_size = ptset.Size();
1717 // Check if a oop field's initializing value is recorded and add
1718 // a corresponding NULL field's value if it is not recorded.
1719 // Connection Graph does not record a default initialization by NULL
1720 // captured by Initialize node.
1721 //
1722 // Note: it will disable scalar replacement in some cases:
1723 //
1724 // Point p[] = new Point[1];
1725 // p[0] = new Point(); // Will be not scalar replaced
1726 //
1727 // but it will save us from incorrect optimizations in next cases:
1728 //
1729 // Point p[] = new Point[1];
1730 // if ( x ) p[0] = new Point(); // Will be not scalar replaced
1731 //
1732 // Do a simple control flow analysis to distinguish above cases.
1733 //
1734 if (offset != Type::OffsetBot && ptset_size == 1) {
1735 uint elem = ptset.getelem(); // Allocation node's index
1736 // It does not matter if it is not Allocation node since
1737 // only non-escaping allocations are scalar replaced.
1738 if (ptnode_adr(elem)->_node->is_Allocate() &&
1739 ptnode_adr(elem)->escape_state() == PointsToNode::NoEscape) {
1740 AllocateNode* alloc = ptnode_adr(elem)->_node->as_Allocate();
1741 InitializeNode* ini = alloc->initialization();
1743 // Check only oop fields.
1744 const Type* adr_type = n->as_AddP()->bottom_type();
1745 BasicType basic_field_type = T_INT;
1746 if (adr_type->isa_instptr()) {
1747 ciField* field = C->alias_type(adr_type->isa_instptr())->field();
1748 if (field != NULL) {
1749 basic_field_type = field->layout_type();
1750 } else {
1751 // Ignore non field load (for example, klass load)
1752 }
1753 } else if (adr_type->isa_aryptr()) {
1754 const Type* elemtype = adr_type->isa_aryptr()->elem();
1755 basic_field_type = elemtype->array_element_basic_type();
1756 } else {
1757 // Raw pointers are used for initializing stores so skip it.
1758 assert(adr_type->isa_rawptr() && base->is_Proj() &&
1759 (base->in(0) == alloc),"unexpected pointer type");
1760 }
1761 if (basic_field_type == T_OBJECT ||
1762 basic_field_type == T_NARROWOOP ||
1763 basic_field_type == T_ARRAY) {
1764 Node* value = NULL;
1765 if (ini != NULL) {
1766 BasicType ft = UseCompressedOops ? T_NARROWOOP : T_OBJECT;
1767 Node* store = ini->find_captured_store(offset, type2aelembytes(ft), phase);
1768 if (store != NULL && store->is_Store()) {
1769 value = store->in(MemNode::ValueIn);
1770 } else if (ptn->edge_count() > 0) { // Are there oop stores?
1771 // Check for a store which follows allocation without branches.
1772 // For example, a volatile field store is not collected
1773 // by Initialize node. TODO: it would be nice to use idom() here.
1774 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
1775 store = n->fast_out(i);
1776 if (store->is_Store() && store->in(0) != NULL) {
1777 Node* ctrl = store->in(0);
1778 while(!(ctrl == ini || ctrl == alloc || ctrl == NULL ||
1779 ctrl == C->root() || ctrl == C->top() || ctrl->is_Region() ||
1780 ctrl->is_IfTrue() || ctrl->is_IfFalse())) {
1781 ctrl = ctrl->in(0);
1782 }
1783 if (ctrl == ini || ctrl == alloc) {
1784 value = store->in(MemNode::ValueIn);
1785 break;
1786 }
1787 }
1788 }
1789 }
1790 }
1791 if (value == NULL || value != ptnode_adr(value->_idx)->_node) {
1792 // A field's initializing value was not recorded. Add NULL.
1793 uint null_idx = UseCompressedOops ? _noop_null : _oop_null;
1794 add_pointsto_edge(nidx, null_idx);
1795 }
1796 }
1797 }
1798 }
1800 // An object is not scalar replaceable if the field which may point
1801 // to it has unknown offset (unknown element of an array of objects).
1802 //
1803 if (offset == Type::OffsetBot) {
1804 uint e_cnt = ptn->edge_count();
1805 for (uint ei = 0; ei < e_cnt; ei++) {
1806 uint npi = ptn->edge_target(ei);
1807 set_escape_state(npi, PointsToNode::ArgEscape);
1808 ptnode_adr(npi)->_scalar_replaceable = false;
1809 }
1810 }
1812 // Currently an object is not scalar replaceable if a LoadStore node
1813 // access its field since the field value is unknown after it.
1814 //
1815 bool has_LoadStore = false;
1816 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
1817 Node *use = n->fast_out(i);
1818 if (use->is_LoadStore()) {
1819 has_LoadStore = true;
1820 break;
1821 }
1822 }
1823 // An object is not scalar replaceable if the address points
1824 // to unknown field (unknown element for arrays, offset is OffsetBot).
1825 //
1826 // Or the address may point to more then one object. This may produce
1827 // the false positive result (set scalar_replaceable to false)
1828 // since the flow-insensitive escape analysis can't separate
1829 // the case when stores overwrite the field's value from the case
1830 // when stores happened on different control branches.
1831 //
1832 if (ptset_size > 1 || ptset_size != 0 &&
1833 (has_LoadStore || offset == Type::OffsetBot)) {
1834 for( VectorSetI j(&ptset); j.test(); ++j ) {
1835 set_escape_state(j.elem, PointsToNode::ArgEscape);
1836 ptnode_adr(j.elem)->_scalar_replaceable = false;
1837 }
1838 }
1839 }
1841 void ConnectionGraph::process_call_arguments(CallNode *call, PhaseTransform *phase) {
1843 switch (call->Opcode()) {
1844 #ifdef ASSERT
1845 case Op_Allocate:
1846 case Op_AllocateArray:
1847 case Op_Lock:
1848 case Op_Unlock:
1849 assert(false, "should be done already");
1850 break;
1851 #endif
1852 case Op_CallLeaf:
1853 case Op_CallLeafNoFP:
1854 {
1855 // Stub calls, objects do not escape but they are not scale replaceable.
1856 // Adjust escape state for outgoing arguments.
1857 const TypeTuple * d = call->tf()->domain();
1858 VectorSet ptset(Thread::current()->resource_area());
1859 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
1860 const Type* at = d->field_at(i);
1861 Node *arg = call->in(i)->uncast();
1862 const Type *aat = phase->type(arg);
1863 if (!arg->is_top() && at->isa_ptr() && aat->isa_ptr() &&
1864 ptnode_adr(arg->_idx)->escape_state() < PointsToNode::ArgEscape) {
1866 assert(aat == Type::TOP || aat == TypePtr::NULL_PTR ||
1867 aat->isa_ptr() != NULL, "expecting an Ptr");
1868 #ifdef ASSERT
1869 if (!(call->Opcode() == Op_CallLeafNoFP &&
1870 call->as_CallLeaf()->_name != NULL &&
1871 (strstr(call->as_CallLeaf()->_name, "arraycopy") != 0) ||
1872 call->as_CallLeaf()->_name != NULL &&
1873 (strcmp(call->as_CallLeaf()->_name, "g1_wb_pre") == 0 ||
1874 strcmp(call->as_CallLeaf()->_name, "g1_wb_post") == 0 ))
1875 ) {
1876 call->dump();
1877 assert(false, "EA: unexpected CallLeaf");
1878 }
1879 #endif
1880 set_escape_state(arg->_idx, PointsToNode::ArgEscape);
1881 if (arg->is_AddP()) {
1882 //
1883 // The inline_native_clone() case when the arraycopy stub is called
1884 // after the allocation before Initialize and CheckCastPP nodes.
1885 //
1886 // Set AddP's base (Allocate) as not scalar replaceable since
1887 // pointer to the base (with offset) is passed as argument.
1888 //
1889 arg = get_addp_base(arg);
1890 }
1891 ptset.Clear();
1892 PointsTo(ptset, arg, phase);
1893 for( VectorSetI j(&ptset); j.test(); ++j ) {
1894 uint pt = j.elem;
1895 set_escape_state(pt, PointsToNode::ArgEscape);
1896 }
1897 }
1898 }
1899 break;
1900 }
1902 case Op_CallStaticJava:
1903 // For a static call, we know exactly what method is being called.
1904 // Use bytecode estimator to record the call's escape affects
1905 {
1906 ciMethod *meth = call->as_CallJava()->method();
1907 BCEscapeAnalyzer *call_analyzer = (meth !=NULL) ? meth->get_bcea() : NULL;
1908 // fall-through if not a Java method or no analyzer information
1909 if (call_analyzer != NULL) {
1910 const TypeTuple * d = call->tf()->domain();
1911 VectorSet ptset(Thread::current()->resource_area());
1912 bool copy_dependencies = false;
1913 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
1914 const Type* at = d->field_at(i);
1915 int k = i - TypeFunc::Parms;
1916 Node *arg = call->in(i)->uncast();
1918 if (at->isa_oopptr() != NULL &&
1919 ptnode_adr(arg->_idx)->escape_state() < PointsToNode::GlobalEscape) {
1921 bool global_escapes = false;
1922 bool fields_escapes = false;
1923 if (!call_analyzer->is_arg_stack(k)) {
1924 // The argument global escapes, mark everything it could point to
1925 set_escape_state(arg->_idx, PointsToNode::GlobalEscape);
1926 global_escapes = true;
1927 } else {
1928 if (!call_analyzer->is_arg_local(k)) {
1929 // The argument itself doesn't escape, but any fields might
1930 fields_escapes = true;
1931 }
1932 set_escape_state(arg->_idx, PointsToNode::ArgEscape);
1933 copy_dependencies = true;
1934 }
1936 ptset.Clear();
1937 PointsTo(ptset, arg, phase);
1938 for( VectorSetI j(&ptset); j.test(); ++j ) {
1939 uint pt = j.elem;
1940 if (global_escapes) {
1941 //The argument global escapes, mark everything it could point to
1942 set_escape_state(pt, PointsToNode::GlobalEscape);
1943 } else {
1944 if (fields_escapes) {
1945 // The argument itself doesn't escape, but any fields might
1946 add_edge_from_fields(pt, _phantom_object, Type::OffsetBot);
1947 }
1948 set_escape_state(pt, PointsToNode::ArgEscape);
1949 }
1950 }
1951 }
1952 }
1953 if (copy_dependencies)
1954 call_analyzer->copy_dependencies(_compile->dependencies());
1955 break;
1956 }
1957 }
1959 default:
1960 // Fall-through here if not a Java method or no analyzer information
1961 // or some other type of call, assume the worst case: all arguments
1962 // globally escape.
1963 {
1964 // adjust escape state for outgoing arguments
1965 const TypeTuple * d = call->tf()->domain();
1966 VectorSet ptset(Thread::current()->resource_area());
1967 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
1968 const Type* at = d->field_at(i);
1969 if (at->isa_oopptr() != NULL) {
1970 Node *arg = call->in(i)->uncast();
1971 set_escape_state(arg->_idx, PointsToNode::GlobalEscape);
1972 ptset.Clear();
1973 PointsTo(ptset, arg, phase);
1974 for( VectorSetI j(&ptset); j.test(); ++j ) {
1975 uint pt = j.elem;
1976 set_escape_state(pt, PointsToNode::GlobalEscape);
1977 }
1978 }
1979 }
1980 }
1981 }
1982 }
1983 void ConnectionGraph::process_call_result(ProjNode *resproj, PhaseTransform *phase) {
1984 CallNode *call = resproj->in(0)->as_Call();
1985 uint call_idx = call->_idx;
1986 uint resproj_idx = resproj->_idx;
1988 switch (call->Opcode()) {
1989 case Op_Allocate:
1990 {
1991 Node *k = call->in(AllocateNode::KlassNode);
1992 const TypeKlassPtr *kt;
1993 if (k->Opcode() == Op_LoadKlass) {
1994 kt = k->as_Load()->type()->isa_klassptr();
1995 } else {
1996 // Also works for DecodeN(LoadNKlass).
1997 kt = k->as_Type()->type()->isa_klassptr();
1998 }
1999 assert(kt != NULL, "TypeKlassPtr required.");
2000 ciKlass* cik = kt->klass();
2001 ciInstanceKlass* ciik = cik->as_instance_klass();
2003 PointsToNode::EscapeState es;
2004 uint edge_to;
2005 if (cik->is_subclass_of(_compile->env()->Thread_klass()) || ciik->has_finalizer()) {
2006 es = PointsToNode::GlobalEscape;
2007 edge_to = _phantom_object; // Could not be worse
2008 } else {
2009 es = PointsToNode::NoEscape;
2010 edge_to = call_idx;
2011 }
2012 set_escape_state(call_idx, es);
2013 add_pointsto_edge(resproj_idx, edge_to);
2014 _processed.set(resproj_idx);
2015 break;
2016 }
2018 case Op_AllocateArray:
2019 {
2020 int length = call->in(AllocateNode::ALength)->find_int_con(-1);
2021 if (length < 0 || length > EliminateAllocationArraySizeLimit) {
2022 // Not scalar replaceable if the length is not constant or too big.
2023 ptnode_adr(call_idx)->_scalar_replaceable = false;
2024 }
2025 set_escape_state(call_idx, PointsToNode::NoEscape);
2026 add_pointsto_edge(resproj_idx, call_idx);
2027 _processed.set(resproj_idx);
2028 break;
2029 }
2031 case Op_CallStaticJava:
2032 // For a static call, we know exactly what method is being called.
2033 // Use bytecode estimator to record whether the call's return value escapes
2034 {
2035 bool done = true;
2036 const TypeTuple *r = call->tf()->range();
2037 const Type* ret_type = NULL;
2039 if (r->cnt() > TypeFunc::Parms)
2040 ret_type = r->field_at(TypeFunc::Parms);
2042 // Note: we use isa_ptr() instead of isa_oopptr() here because the
2043 // _multianewarray functions return a TypeRawPtr.
2044 if (ret_type == NULL || ret_type->isa_ptr() == NULL) {
2045 _processed.set(resproj_idx);
2046 break; // doesn't return a pointer type
2047 }
2048 ciMethod *meth = call->as_CallJava()->method();
2049 const TypeTuple * d = call->tf()->domain();
2050 if (meth == NULL) {
2051 // not a Java method, assume global escape
2052 set_escape_state(call_idx, PointsToNode::GlobalEscape);
2053 add_pointsto_edge(resproj_idx, _phantom_object);
2054 } else {
2055 BCEscapeAnalyzer *call_analyzer = meth->get_bcea();
2056 bool copy_dependencies = false;
2058 if (call_analyzer->is_return_allocated()) {
2059 // Returns a newly allocated unescaped object, simply
2060 // update dependency information.
2061 // Mark it as NoEscape so that objects referenced by
2062 // it's fields will be marked as NoEscape at least.
2063 set_escape_state(call_idx, PointsToNode::NoEscape);
2064 add_pointsto_edge(resproj_idx, call_idx);
2065 copy_dependencies = true;
2066 } else if (call_analyzer->is_return_local()) {
2067 // determine whether any arguments are returned
2068 set_escape_state(call_idx, PointsToNode::NoEscape);
2069 bool ret_arg = false;
2070 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
2071 const Type* at = d->field_at(i);
2073 if (at->isa_oopptr() != NULL) {
2074 Node *arg = call->in(i)->uncast();
2076 if (call_analyzer->is_arg_returned(i - TypeFunc::Parms)) {
2077 ret_arg = true;
2078 PointsToNode *arg_esp = ptnode_adr(arg->_idx);
2079 if (arg_esp->node_type() == PointsToNode::UnknownType)
2080 done = false;
2081 else if (arg_esp->node_type() == PointsToNode::JavaObject)
2082 add_pointsto_edge(resproj_idx, arg->_idx);
2083 else
2084 add_deferred_edge(resproj_idx, arg->_idx);
2085 arg_esp->_hidden_alias = true;
2086 }
2087 }
2088 }
2089 if (done && !ret_arg) {
2090 // Returns unknown object.
2091 set_escape_state(call_idx, PointsToNode::GlobalEscape);
2092 add_pointsto_edge(resproj_idx, _phantom_object);
2093 }
2094 copy_dependencies = true;
2095 } else {
2096 set_escape_state(call_idx, PointsToNode::GlobalEscape);
2097 add_pointsto_edge(resproj_idx, _phantom_object);
2098 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
2099 const Type* at = d->field_at(i);
2100 if (at->isa_oopptr() != NULL) {
2101 Node *arg = call->in(i)->uncast();
2102 PointsToNode *arg_esp = ptnode_adr(arg->_idx);
2103 arg_esp->_hidden_alias = true;
2104 }
2105 }
2106 }
2107 if (copy_dependencies)
2108 call_analyzer->copy_dependencies(_compile->dependencies());
2109 }
2110 if (done)
2111 _processed.set(resproj_idx);
2112 break;
2113 }
2115 default:
2116 // Some other type of call, assume the worst case that the
2117 // returned value, if any, globally escapes.
2118 {
2119 const TypeTuple *r = call->tf()->range();
2120 if (r->cnt() > TypeFunc::Parms) {
2121 const Type* ret_type = r->field_at(TypeFunc::Parms);
2123 // Note: we use isa_ptr() instead of isa_oopptr() here because the
2124 // _multianewarray functions return a TypeRawPtr.
2125 if (ret_type->isa_ptr() != NULL) {
2126 set_escape_state(call_idx, PointsToNode::GlobalEscape);
2127 add_pointsto_edge(resproj_idx, _phantom_object);
2128 }
2129 }
2130 _processed.set(resproj_idx);
2131 }
2132 }
2133 }
2135 // Populate Connection Graph with Ideal nodes and create simple
2136 // connection graph edges (do not need to check the node_type of inputs
2137 // or to call PointsTo() to walk the connection graph).
2138 void ConnectionGraph::record_for_escape_analysis(Node *n, PhaseTransform *phase) {
2139 if (_processed.test(n->_idx))
2140 return; // No need to redefine node's state.
2142 if (n->is_Call()) {
2143 // Arguments to allocation and locking don't escape.
2144 if (n->is_Allocate()) {
2145 add_node(n, PointsToNode::JavaObject, PointsToNode::UnknownEscape, true);
2146 record_for_optimizer(n);
2147 } else if (n->is_Lock() || n->is_Unlock()) {
2148 // Put Lock and Unlock nodes on IGVN worklist to process them during
2149 // the first IGVN optimization when escape information is still available.
2150 record_for_optimizer(n);
2151 _processed.set(n->_idx);
2152 } else {
2153 // Don't mark as processed since call's arguments have to be processed.
2154 PointsToNode::NodeType nt = PointsToNode::UnknownType;
2155 PointsToNode::EscapeState es = PointsToNode::UnknownEscape;
2157 // Check if a call returns an object.
2158 const TypeTuple *r = n->as_Call()->tf()->range();
2159 if (r->cnt() > TypeFunc::Parms &&
2160 r->field_at(TypeFunc::Parms)->isa_ptr() &&
2161 n->as_Call()->proj_out(TypeFunc::Parms) != NULL) {
2162 nt = PointsToNode::JavaObject;
2163 if (!n->is_CallStaticJava()) {
2164 // Since the called mathod is statically unknown assume
2165 // the worst case that the returned value globally escapes.
2166 es = PointsToNode::GlobalEscape;
2167 }
2168 }
2169 add_node(n, nt, es, false);
2170 }
2171 return;
2172 }
2174 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because
2175 // ThreadLocal has RawPrt type.
2176 switch (n->Opcode()) {
2177 case Op_AddP:
2178 {
2179 add_node(n, PointsToNode::Field, PointsToNode::UnknownEscape, false);
2180 break;
2181 }
2182 case Op_CastX2P:
2183 { // "Unsafe" memory access.
2184 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true);
2185 break;
2186 }
2187 case Op_CastPP:
2188 case Op_CheckCastPP:
2189 case Op_EncodeP:
2190 case Op_DecodeN:
2191 {
2192 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false);
2193 int ti = n->in(1)->_idx;
2194 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type();
2195 if (nt == PointsToNode::UnknownType) {
2196 _delayed_worklist.push(n); // Process it later.
2197 break;
2198 } else if (nt == PointsToNode::JavaObject) {
2199 add_pointsto_edge(n->_idx, ti);
2200 } else {
2201 add_deferred_edge(n->_idx, ti);
2202 }
2203 _processed.set(n->_idx);
2204 break;
2205 }
2206 case Op_ConP:
2207 {
2208 // assume all pointer constants globally escape except for null
2209 PointsToNode::EscapeState es;
2210 if (phase->type(n) == TypePtr::NULL_PTR)
2211 es = PointsToNode::NoEscape;
2212 else
2213 es = PointsToNode::GlobalEscape;
2215 add_node(n, PointsToNode::JavaObject, es, true);
2216 break;
2217 }
2218 case Op_ConN:
2219 {
2220 // assume all narrow oop constants globally escape except for null
2221 PointsToNode::EscapeState es;
2222 if (phase->type(n) == TypeNarrowOop::NULL_PTR)
2223 es = PointsToNode::NoEscape;
2224 else
2225 es = PointsToNode::GlobalEscape;
2227 add_node(n, PointsToNode::JavaObject, es, true);
2228 break;
2229 }
2230 case Op_CreateEx:
2231 {
2232 // assume that all exception objects globally escape
2233 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true);
2234 break;
2235 }
2236 case Op_LoadKlass:
2237 case Op_LoadNKlass:
2238 {
2239 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true);
2240 break;
2241 }
2242 case Op_LoadP:
2243 case Op_LoadN:
2244 {
2245 const Type *t = phase->type(n);
2246 if (t->make_ptr() == NULL) {
2247 _processed.set(n->_idx);
2248 return;
2249 }
2250 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false);
2251 break;
2252 }
2253 case Op_Parm:
2254 {
2255 _processed.set(n->_idx); // No need to redefine it state.
2256 uint con = n->as_Proj()->_con;
2257 if (con < TypeFunc::Parms)
2258 return;
2259 const Type *t = n->in(0)->as_Start()->_domain->field_at(con);
2260 if (t->isa_ptr() == NULL)
2261 return;
2262 // We have to assume all input parameters globally escape
2263 // (Note: passing 'false' since _processed is already set).
2264 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, false);
2265 break;
2266 }
2267 case Op_Phi:
2268 {
2269 const Type *t = n->as_Phi()->type();
2270 if (t->make_ptr() == NULL) {
2271 // nothing to do if not an oop or narrow oop
2272 _processed.set(n->_idx);
2273 return;
2274 }
2275 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false);
2276 uint i;
2277 for (i = 1; i < n->req() ; i++) {
2278 Node* in = n->in(i);
2279 if (in == NULL)
2280 continue; // ignore NULL
2281 in = in->uncast();
2282 if (in->is_top() || in == n)
2283 continue; // ignore top or inputs which go back this node
2284 int ti = in->_idx;
2285 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type();
2286 if (nt == PointsToNode::UnknownType) {
2287 break;
2288 } else if (nt == PointsToNode::JavaObject) {
2289 add_pointsto_edge(n->_idx, ti);
2290 } else {
2291 add_deferred_edge(n->_idx, ti);
2292 }
2293 }
2294 if (i >= n->req())
2295 _processed.set(n->_idx);
2296 else
2297 _delayed_worklist.push(n);
2298 break;
2299 }
2300 case Op_Proj:
2301 {
2302 // we are only interested in the oop result projection from a call
2303 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) {
2304 const TypeTuple *r = n->in(0)->as_Call()->tf()->range();
2305 assert(r->cnt() > TypeFunc::Parms, "sanity");
2306 if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) {
2307 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false);
2308 int ti = n->in(0)->_idx;
2309 // The call may not be registered yet (since not all its inputs are registered)
2310 // if this is the projection from backbranch edge of Phi.
2311 if (ptnode_adr(ti)->node_type() != PointsToNode::UnknownType) {
2312 process_call_result(n->as_Proj(), phase);
2313 }
2314 if (!_processed.test(n->_idx)) {
2315 // The call's result may need to be processed later if the call
2316 // returns it's argument and the argument is not processed yet.
2317 _delayed_worklist.push(n);
2318 }
2319 break;
2320 }
2321 }
2322 _processed.set(n->_idx);
2323 break;
2324 }
2325 case Op_Return:
2326 {
2327 if( n->req() > TypeFunc::Parms &&
2328 phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) {
2329 // Treat Return value as LocalVar with GlobalEscape escape state.
2330 add_node(n, PointsToNode::LocalVar, PointsToNode::GlobalEscape, false);
2331 int ti = n->in(TypeFunc::Parms)->_idx;
2332 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type();
2333 if (nt == PointsToNode::UnknownType) {
2334 _delayed_worklist.push(n); // Process it later.
2335 break;
2336 } else if (nt == PointsToNode::JavaObject) {
2337 add_pointsto_edge(n->_idx, ti);
2338 } else {
2339 add_deferred_edge(n->_idx, ti);
2340 }
2341 }
2342 _processed.set(n->_idx);
2343 break;
2344 }
2345 case Op_StoreP:
2346 case Op_StoreN:
2347 {
2348 const Type *adr_type = phase->type(n->in(MemNode::Address));
2349 adr_type = adr_type->make_ptr();
2350 if (adr_type->isa_oopptr()) {
2351 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false);
2352 } else {
2353 Node* adr = n->in(MemNode::Address);
2354 if (adr->is_AddP() && phase->type(adr) == TypeRawPtr::NOTNULL &&
2355 adr->in(AddPNode::Address)->is_Proj() &&
2356 adr->in(AddPNode::Address)->in(0)->is_Allocate()) {
2357 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false);
2358 // We are computing a raw address for a store captured
2359 // by an Initialize compute an appropriate address type.
2360 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot);
2361 assert(offs != Type::OffsetBot, "offset must be a constant");
2362 } else {
2363 _processed.set(n->_idx);
2364 return;
2365 }
2366 }
2367 break;
2368 }
2369 case Op_StorePConditional:
2370 case Op_CompareAndSwapP:
2371 case Op_CompareAndSwapN:
2372 {
2373 const Type *adr_type = phase->type(n->in(MemNode::Address));
2374 adr_type = adr_type->make_ptr();
2375 if (adr_type->isa_oopptr()) {
2376 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false);
2377 } else {
2378 _processed.set(n->_idx);
2379 return;
2380 }
2381 break;
2382 }
2383 case Op_AryEq:
2384 case Op_StrComp:
2385 case Op_StrEquals:
2386 case Op_StrIndexOf:
2387 {
2388 // char[] arrays passed to string intrinsics are not scalar replaceable.
2389 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false);
2390 break;
2391 }
2392 case Op_ThreadLocal:
2393 {
2394 add_node(n, PointsToNode::JavaObject, PointsToNode::ArgEscape, true);
2395 break;
2396 }
2397 default:
2398 ;
2399 // nothing to do
2400 }
2401 return;
2402 }
2404 void ConnectionGraph::build_connection_graph(Node *n, PhaseTransform *phase) {
2405 uint n_idx = n->_idx;
2406 assert(ptnode_adr(n_idx)->_node != NULL, "node should be registered");
2408 // Don't set processed bit for AddP, LoadP, StoreP since
2409 // they may need more then one pass to process.
2410 if (_processed.test(n_idx))
2411 return; // No need to redefine node's state.
2413 if (n->is_Call()) {
2414 CallNode *call = n->as_Call();
2415 process_call_arguments(call, phase);
2416 _processed.set(n_idx);
2417 return;
2418 }
2420 switch (n->Opcode()) {
2421 case Op_AddP:
2422 {
2423 Node *base = get_addp_base(n);
2424 // Create a field edge to this node from everything base could point to.
2425 VectorSet ptset(Thread::current()->resource_area());
2426 PointsTo(ptset, base, phase);
2427 for( VectorSetI i(&ptset); i.test(); ++i ) {
2428 uint pt = i.elem;
2429 add_field_edge(pt, n_idx, address_offset(n, phase));
2430 }
2431 break;
2432 }
2433 case Op_CastX2P:
2434 {
2435 assert(false, "Op_CastX2P");
2436 break;
2437 }
2438 case Op_CastPP:
2439 case Op_CheckCastPP:
2440 case Op_EncodeP:
2441 case Op_DecodeN:
2442 {
2443 int ti = n->in(1)->_idx;
2444 assert(ptnode_adr(ti)->node_type() != PointsToNode::UnknownType, "all nodes should be registered");
2445 if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) {
2446 add_pointsto_edge(n_idx, ti);
2447 } else {
2448 add_deferred_edge(n_idx, ti);
2449 }
2450 _processed.set(n_idx);
2451 break;
2452 }
2453 case Op_ConP:
2454 {
2455 assert(false, "Op_ConP");
2456 break;
2457 }
2458 case Op_ConN:
2459 {
2460 assert(false, "Op_ConN");
2461 break;
2462 }
2463 case Op_CreateEx:
2464 {
2465 assert(false, "Op_CreateEx");
2466 break;
2467 }
2468 case Op_LoadKlass:
2469 case Op_LoadNKlass:
2470 {
2471 assert(false, "Op_LoadKlass");
2472 break;
2473 }
2474 case Op_LoadP:
2475 case Op_LoadN:
2476 {
2477 const Type *t = phase->type(n);
2478 #ifdef ASSERT
2479 if (t->make_ptr() == NULL)
2480 assert(false, "Op_LoadP");
2481 #endif
2483 Node* adr = n->in(MemNode::Address)->uncast();
2484 Node* adr_base;
2485 if (adr->is_AddP()) {
2486 adr_base = get_addp_base(adr);
2487 } else {
2488 adr_base = adr;
2489 }
2491 // For everything "adr_base" could point to, create a deferred edge from
2492 // this node to each field with the same offset.
2493 VectorSet ptset(Thread::current()->resource_area());
2494 PointsTo(ptset, adr_base, phase);
2495 int offset = address_offset(adr, phase);
2496 for( VectorSetI i(&ptset); i.test(); ++i ) {
2497 uint pt = i.elem;
2498 add_deferred_edge_to_fields(n_idx, pt, offset);
2499 }
2500 break;
2501 }
2502 case Op_Parm:
2503 {
2504 assert(false, "Op_Parm");
2505 break;
2506 }
2507 case Op_Phi:
2508 {
2509 #ifdef ASSERT
2510 const Type *t = n->as_Phi()->type();
2511 if (t->make_ptr() == NULL)
2512 assert(false, "Op_Phi");
2513 #endif
2514 for (uint i = 1; i < n->req() ; i++) {
2515 Node* in = n->in(i);
2516 if (in == NULL)
2517 continue; // ignore NULL
2518 in = in->uncast();
2519 if (in->is_top() || in == n)
2520 continue; // ignore top or inputs which go back this node
2521 int ti = in->_idx;
2522 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type();
2523 assert(nt != PointsToNode::UnknownType, "all nodes should be known");
2524 if (nt == PointsToNode::JavaObject) {
2525 add_pointsto_edge(n_idx, ti);
2526 } else {
2527 add_deferred_edge(n_idx, ti);
2528 }
2529 }
2530 _processed.set(n_idx);
2531 break;
2532 }
2533 case Op_Proj:
2534 {
2535 // we are only interested in the oop result projection from a call
2536 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) {
2537 assert(ptnode_adr(n->in(0)->_idx)->node_type() != PointsToNode::UnknownType,
2538 "all nodes should be registered");
2539 const TypeTuple *r = n->in(0)->as_Call()->tf()->range();
2540 assert(r->cnt() > TypeFunc::Parms, "sanity");
2541 if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) {
2542 process_call_result(n->as_Proj(), phase);
2543 assert(_processed.test(n_idx), "all call results should be processed");
2544 break;
2545 }
2546 }
2547 assert(false, "Op_Proj");
2548 break;
2549 }
2550 case Op_Return:
2551 {
2552 #ifdef ASSERT
2553 if( n->req() <= TypeFunc::Parms ||
2554 !phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) {
2555 assert(false, "Op_Return");
2556 }
2557 #endif
2558 int ti = n->in(TypeFunc::Parms)->_idx;
2559 assert(ptnode_adr(ti)->node_type() != PointsToNode::UnknownType, "node should be registered");
2560 if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) {
2561 add_pointsto_edge(n_idx, ti);
2562 } else {
2563 add_deferred_edge(n_idx, ti);
2564 }
2565 _processed.set(n_idx);
2566 break;
2567 }
2568 case Op_StoreP:
2569 case Op_StoreN:
2570 case Op_StorePConditional:
2571 case Op_CompareAndSwapP:
2572 case Op_CompareAndSwapN:
2573 {
2574 Node *adr = n->in(MemNode::Address);
2575 const Type *adr_type = phase->type(adr)->make_ptr();
2576 #ifdef ASSERT
2577 if (!adr_type->isa_oopptr())
2578 assert(phase->type(adr) == TypeRawPtr::NOTNULL, "Op_StoreP");
2579 #endif
2581 assert(adr->is_AddP(), "expecting an AddP");
2582 Node *adr_base = get_addp_base(adr);
2583 Node *val = n->in(MemNode::ValueIn)->uncast();
2584 // For everything "adr_base" could point to, create a deferred edge
2585 // to "val" from each field with the same offset.
2586 VectorSet ptset(Thread::current()->resource_area());
2587 PointsTo(ptset, adr_base, phase);
2588 for( VectorSetI i(&ptset); i.test(); ++i ) {
2589 uint pt = i.elem;
2590 add_edge_from_fields(pt, val->_idx, address_offset(adr, phase));
2591 }
2592 break;
2593 }
2594 case Op_AryEq:
2595 case Op_StrComp:
2596 case Op_StrEquals:
2597 case Op_StrIndexOf:
2598 {
2599 // char[] arrays passed to string intrinsic do not escape but
2600 // they are not scalar replaceable. Adjust escape state for them.
2601 // Start from in(2) edge since in(1) is memory edge.
2602 for (uint i = 2; i < n->req(); i++) {
2603 Node* adr = n->in(i)->uncast();
2604 const Type *at = phase->type(adr);
2605 if (!adr->is_top() && at->isa_ptr()) {
2606 assert(at == Type::TOP || at == TypePtr::NULL_PTR ||
2607 at->isa_ptr() != NULL, "expecting an Ptr");
2608 if (adr->is_AddP()) {
2609 adr = get_addp_base(adr);
2610 }
2611 // Mark as ArgEscape everything "adr" could point to.
2612 set_escape_state(adr->_idx, PointsToNode::ArgEscape);
2613 }
2614 }
2615 _processed.set(n_idx);
2616 break;
2617 }
2618 case Op_ThreadLocal:
2619 {
2620 assert(false, "Op_ThreadLocal");
2621 break;
2622 }
2623 default:
2624 // This method should be called only for EA specific nodes.
2625 ShouldNotReachHere();
2626 }
2627 }
2629 #ifndef PRODUCT
2630 void ConnectionGraph::dump() {
2631 PhaseGVN *igvn = _compile->initial_gvn();
2632 bool first = true;
2634 uint size = nodes_size();
2635 for (uint ni = 0; ni < size; ni++) {
2636 PointsToNode *ptn = ptnode_adr(ni);
2637 PointsToNode::NodeType ptn_type = ptn->node_type();
2639 if (ptn_type != PointsToNode::JavaObject || ptn->_node == NULL)
2640 continue;
2641 PointsToNode::EscapeState es = escape_state(ptn->_node, igvn);
2642 if (ptn->_node->is_Allocate() && (es == PointsToNode::NoEscape || Verbose)) {
2643 if (first) {
2644 tty->cr();
2645 tty->print("======== Connection graph for ");
2646 _compile->method()->print_short_name();
2647 tty->cr();
2648 first = false;
2649 }
2650 tty->print("%6d ", ni);
2651 ptn->dump();
2652 // Print all locals which reference this allocation
2653 for (uint li = ni; li < size; li++) {
2654 PointsToNode *ptn_loc = ptnode_adr(li);
2655 PointsToNode::NodeType ptn_loc_type = ptn_loc->node_type();
2656 if ( ptn_loc_type == PointsToNode::LocalVar && ptn_loc->_node != NULL &&
2657 ptn_loc->edge_count() == 1 && ptn_loc->edge_target(0) == ni ) {
2658 ptnode_adr(li)->dump(false);
2659 }
2660 }
2661 if (Verbose) {
2662 // Print all fields which reference this allocation
2663 for (uint i = 0; i < ptn->edge_count(); i++) {
2664 uint ei = ptn->edge_target(i);
2665 ptnode_adr(ei)->dump(false);
2666 }
2667 }
2668 tty->cr();
2669 }
2670 }
2671 }
2672 #endif