Mercurial > hg > truffle
annotate src/share/vm/opto/escape.cpp @ 196:d1605aabd0a1 jdk7-b30
6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell
| author | xdono |
|---|---|
| date | Wed, 02 Jul 2008 12:55:16 -0700 |
| parents | 7793bd37a336 |
| children | 9c2ecc2ffb12 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_escape.cpp.incl" | |
| 27 | |
| 28 uint PointsToNode::edge_target(uint e) const { | |
| 29 assert(_edges != NULL && e < (uint)_edges->length(), "valid edge index"); | |
| 30 return (_edges->at(e) >> EdgeShift); | |
| 31 } | |
| 32 | |
| 33 PointsToNode::EdgeType PointsToNode::edge_type(uint e) const { | |
| 34 assert(_edges != NULL && e < (uint)_edges->length(), "valid edge index"); | |
| 35 return (EdgeType) (_edges->at(e) & EdgeMask); | |
| 36 } | |
| 37 | |
| 38 void PointsToNode::add_edge(uint targIdx, PointsToNode::EdgeType et) { | |
| 39 uint v = (targIdx << EdgeShift) + ((uint) et); | |
| 40 if (_edges == NULL) { | |
| 41 Arena *a = Compile::current()->comp_arena(); | |
| 42 _edges = new(a) GrowableArray<uint>(a, INITIAL_EDGE_COUNT, 0, 0); | |
| 43 } | |
| 44 _edges->append_if_missing(v); | |
| 45 } | |
| 46 | |
| 47 void PointsToNode::remove_edge(uint targIdx, PointsToNode::EdgeType et) { | |
| 48 uint v = (targIdx << EdgeShift) + ((uint) et); | |
| 49 | |
| 50 _edges->remove(v); | |
| 51 } | |
| 52 | |
| 53 #ifndef PRODUCT | |
| 77 | 54 static const char *node_type_names[] = { |
| 0 | 55 "UnknownType", |
| 56 "JavaObject", | |
| 57 "LocalVar", | |
| 58 "Field" | |
| 59 }; | |
| 60 | |
| 77 | 61 static const char *esc_names[] = { |
| 0 | 62 "UnknownEscape", |
| 65 | 63 "NoEscape", |
| 64 "ArgEscape", | |
| 65 "GlobalEscape" | |
| 0 | 66 }; |
| 67 | |
| 77 | 68 static const char *edge_type_suffix[] = { |
| 0 | 69 "?", // UnknownEdge |
| 70 "P", // PointsToEdge | |
| 71 "D", // DeferredEdge | |
| 72 "F" // FieldEdge | |
| 73 }; | |
| 74 | |
| 75 void PointsToNode::dump() const { | |
| 76 NodeType nt = node_type(); | |
| 77 EscapeState es = escape_state(); | |
| 65 | 78 tty->print("%s %s %s [[", node_type_names[(int) nt], esc_names[(int) es], _scalar_replaceable ? "" : "NSR"); |
| 0 | 79 for (uint i = 0; i < edge_count(); i++) { |
| 80 tty->print(" %d%s", edge_target(i), edge_type_suffix[(int) edge_type(i)]); | |
| 81 } | |
| 82 tty->print("]] "); | |
| 83 if (_node == NULL) | |
| 84 tty->print_cr("<null>"); | |
| 85 else | |
| 86 _node->dump(); | |
| 87 } | |
| 88 #endif | |
| 89 | |
| 90 ConnectionGraph::ConnectionGraph(Compile * C) : _processed(C->comp_arena()), _node_map(C->comp_arena()) { | |
| 91 _collecting = true; | |
| 92 this->_compile = C; | |
| 93 const PointsToNode &dummy = PointsToNode(); | |
| 65 | 94 int sz = C->unique(); |
| 95 _nodes = new(C->comp_arena()) GrowableArray<PointsToNode>(C->comp_arena(), sz, sz, dummy); | |
| 0 | 96 _phantom_object = C->top()->_idx; |
| 97 PointsToNode *phn = ptnode_adr(_phantom_object); | |
| 65 | 98 phn->_node = C->top(); |
| 0 | 99 phn->set_node_type(PointsToNode::JavaObject); |
| 100 phn->set_escape_state(PointsToNode::GlobalEscape); | |
| 101 } | |
| 102 | |
| 103 void ConnectionGraph::add_pointsto_edge(uint from_i, uint to_i) { | |
| 104 PointsToNode *f = ptnode_adr(from_i); | |
| 105 PointsToNode *t = ptnode_adr(to_i); | |
| 106 | |
| 107 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
| 108 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of PointsTo edge"); | |
| 109 assert(t->node_type() == PointsToNode::JavaObject, "invalid destination of PointsTo edge"); | |
| 110 f->add_edge(to_i, PointsToNode::PointsToEdge); | |
| 111 } | |
| 112 | |
| 113 void ConnectionGraph::add_deferred_edge(uint from_i, uint to_i) { | |
| 114 PointsToNode *f = ptnode_adr(from_i); | |
| 115 PointsToNode *t = ptnode_adr(to_i); | |
| 116 | |
| 117 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
| 118 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of Deferred edge"); | |
| 119 assert(t->node_type() == PointsToNode::LocalVar || t->node_type() == PointsToNode::Field, "invalid destination of Deferred edge"); | |
| 120 // don't add a self-referential edge, this can occur during removal of | |
| 121 // deferred edges | |
| 122 if (from_i != to_i) | |
| 123 f->add_edge(to_i, PointsToNode::DeferredEdge); | |
| 124 } | |
| 125 | |
| 65 | 126 int ConnectionGraph::address_offset(Node* adr, PhaseTransform *phase) { |
| 127 const Type *adr_type = phase->type(adr); | |
| 128 if (adr->is_AddP() && adr_type->isa_oopptr() == NULL && | |
| 129 adr->in(AddPNode::Address)->is_Proj() && | |
| 130 adr->in(AddPNode::Address)->in(0)->is_Allocate()) { | |
| 131 // We are computing a raw address for a store captured by an Initialize | |
| 132 // compute an appropriate address type. AddP cases #3 and #5 (see below). | |
| 133 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); | |
| 134 assert(offs != Type::OffsetBot || | |
| 135 adr->in(AddPNode::Address)->in(0)->is_AllocateArray(), | |
| 136 "offset must be a constant or it is initialization of array"); | |
| 137 return offs; | |
| 138 } | |
| 139 const TypePtr *t_ptr = adr_type->isa_ptr(); | |
| 0 | 140 assert(t_ptr != NULL, "must be a pointer type"); |
| 141 return t_ptr->offset(); | |
| 142 } | |
| 143 | |
| 144 void ConnectionGraph::add_field_edge(uint from_i, uint to_i, int offset) { | |
| 145 PointsToNode *f = ptnode_adr(from_i); | |
| 146 PointsToNode *t = ptnode_adr(to_i); | |
| 147 | |
| 148 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
| 149 assert(f->node_type() == PointsToNode::JavaObject, "invalid destination of Field edge"); | |
| 150 assert(t->node_type() == PointsToNode::Field, "invalid destination of Field edge"); | |
| 151 assert (t->offset() == -1 || t->offset() == offset, "conflicting field offsets"); | |
| 152 t->set_offset(offset); | |
| 153 | |
| 154 f->add_edge(to_i, PointsToNode::FieldEdge); | |
| 155 } | |
| 156 | |
| 157 void ConnectionGraph::set_escape_state(uint ni, PointsToNode::EscapeState es) { | |
| 158 PointsToNode *npt = ptnode_adr(ni); | |
| 159 PointsToNode::EscapeState old_es = npt->escape_state(); | |
| 160 if (es > old_es) | |
| 161 npt->set_escape_state(es); | |
| 162 } | |
| 163 | |
| 65 | 164 void ConnectionGraph::add_node(Node *n, PointsToNode::NodeType nt, |
| 165 PointsToNode::EscapeState es, bool done) { | |
| 166 PointsToNode* ptadr = ptnode_adr(n->_idx); | |
| 167 ptadr->_node = n; | |
| 168 ptadr->set_node_type(nt); | |
| 169 | |
| 170 // inline set_escape_state(idx, es); | |
| 171 PointsToNode::EscapeState old_es = ptadr->escape_state(); | |
| 172 if (es > old_es) | |
| 173 ptadr->set_escape_state(es); | |
| 174 | |
| 175 if (done) | |
| 176 _processed.set(n->_idx); | |
| 177 } | |
| 178 | |
| 0 | 179 PointsToNode::EscapeState ConnectionGraph::escape_state(Node *n, PhaseTransform *phase) { |
| 180 uint idx = n->_idx; | |
| 181 PointsToNode::EscapeState es; | |
| 182 | |
| 65 | 183 // If we are still collecting or there were no non-escaping allocations |
| 184 // we don't know the answer yet | |
| 185 if (_collecting || !_has_allocations) | |
| 0 | 186 return PointsToNode::UnknownEscape; |
| 187 | |
| 188 // if the node was created after the escape computation, return | |
| 189 // UnknownEscape | |
| 190 if (idx >= (uint)_nodes->length()) | |
| 191 return PointsToNode::UnknownEscape; | |
| 192 | |
| 193 es = _nodes->at_grow(idx).escape_state(); | |
| 194 | |
| 195 // if we have already computed a value, return it | |
| 196 if (es != PointsToNode::UnknownEscape) | |
| 197 return es; | |
| 198 | |
| 199 // compute max escape state of anything this node could point to | |
| 200 VectorSet ptset(Thread::current()->resource_area()); | |
| 201 PointsTo(ptset, n, phase); | |
| 65 | 202 for(VectorSetI i(&ptset); i.test() && es != PointsToNode::GlobalEscape; ++i) { |
| 0 | 203 uint pt = i.elem; |
| 65 | 204 PointsToNode::EscapeState pes = _nodes->adr_at(pt)->escape_state(); |
| 0 | 205 if (pes > es) |
| 206 es = pes; | |
| 207 } | |
| 208 // cache the computed escape state | |
| 209 assert(es != PointsToNode::UnknownEscape, "should have computed an escape state"); | |
| 210 _nodes->adr_at(idx)->set_escape_state(es); | |
| 211 return es; | |
| 212 } | |
| 213 | |
| 214 void ConnectionGraph::PointsTo(VectorSet &ptset, Node * n, PhaseTransform *phase) { | |
| 215 VectorSet visited(Thread::current()->resource_area()); | |
| 216 GrowableArray<uint> worklist; | |
| 217 | |
|
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218 #ifdef ASSERT |
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219 Node *orig_n = n; |
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220 #endif |
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221 |
| 65 | 222 n = n->uncast(); |
| 0 | 223 PointsToNode npt = _nodes->at_grow(n->_idx); |
| 224 | |
| 225 // If we have a JavaObject, return just that object | |
| 226 if (npt.node_type() == PointsToNode::JavaObject) { | |
| 227 ptset.set(n->_idx); | |
| 228 return; | |
| 229 } | |
|
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230 #ifdef ASSERT |
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231 if (npt._node == NULL) { |
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232 if (orig_n != n) |
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233 orig_n->dump(); |
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234 n->dump(); |
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235 assert(npt._node != NULL, "unregistered node"); |
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236 } |
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237 #endif |
| 0 | 238 worklist.push(n->_idx); |
| 239 while(worklist.length() > 0) { | |
| 240 int ni = worklist.pop(); | |
| 241 PointsToNode pn = _nodes->at_grow(ni); | |
| 65 | 242 if (!visited.test_set(ni)) { |
| 0 | 243 // ensure that all inputs of a Phi have been processed |
| 65 | 244 assert(!_collecting || !pn._node->is_Phi() || _processed.test(ni),""); |
| 0 | 245 |
| 246 int edges_processed = 0; | |
| 247 for (uint e = 0; e < pn.edge_count(); e++) { | |
| 65 | 248 uint etgt = pn.edge_target(e); |
| 0 | 249 PointsToNode::EdgeType et = pn.edge_type(e); |
| 250 if (et == PointsToNode::PointsToEdge) { | |
| 65 | 251 ptset.set(etgt); |
| 0 | 252 edges_processed++; |
| 253 } else if (et == PointsToNode::DeferredEdge) { | |
| 65 | 254 worklist.push(etgt); |
| 0 | 255 edges_processed++; |
| 65 | 256 } else { |
| 257 assert(false,"neither PointsToEdge or DeferredEdge"); | |
| 0 | 258 } |
| 259 } | |
| 260 if (edges_processed == 0) { | |
| 65 | 261 // no deferred or pointsto edges found. Assume the value was set |
| 262 // outside this method. Add the phantom object to the pointsto set. | |
| 0 | 263 ptset.set(_phantom_object); |
| 264 } | |
| 265 } | |
| 266 } | |
| 267 } | |
| 268 | |
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269 void ConnectionGraph::remove_deferred(uint ni, GrowableArray<uint>* deferred_edges, VectorSet* visited) { |
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270 // This method is most expensive during ConnectionGraph construction. |
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271 // Reuse vectorSet and an additional growable array for deferred edges. |
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272 deferred_edges->clear(); |
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273 visited->Clear(); |
| 0 | 274 |
| 275 uint i = 0; | |
| 276 PointsToNode *ptn = ptnode_adr(ni); | |
| 277 | |
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278 // Mark current edges as visited and move deferred edges to separate array. |
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279 while (i < ptn->edge_count()) { |
| 65 | 280 uint t = ptn->edge_target(i); |
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281 #ifdef ASSERT |
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282 assert(!visited->test_set(t), "expecting no duplications"); |
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283 #else |
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284 visited->set(t); |
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285 #endif |
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286 if (ptn->edge_type(i) == PointsToNode::DeferredEdge) { |
| 0 | 287 ptn->remove_edge(t, PointsToNode::DeferredEdge); |
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288 deferred_edges->append(t); |
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289 } else { |
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290 i++; |
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291 } |
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292 } |
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293 for (int next = 0; next < deferred_edges->length(); ++next) { |
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294 uint t = deferred_edges->at(next); |
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295 PointsToNode *ptt = ptnode_adr(t); |
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296 for (uint j = 0; j < ptt->edge_count(); j++) { |
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297 uint n1 = ptt->edge_target(j); |
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298 if (visited->test_set(n1)) |
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299 continue; |
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300 switch(ptt->edge_type(j)) { |
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301 case PointsToNode::PointsToEdge: |
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302 add_pointsto_edge(ni, n1); |
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303 if(n1 == _phantom_object) { |
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304 // Special case - field set outside (globally escaping). |
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305 ptn->set_escape_state(PointsToNode::GlobalEscape); |
| 0 | 306 } |
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307 break; |
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308 case PointsToNode::DeferredEdge: |
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309 deferred_edges->append(n1); |
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310 break; |
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311 case PointsToNode::FieldEdge: |
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312 assert(false, "invalid connection graph"); |
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313 break; |
| 0 | 314 } |
| 315 } | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 | |
| 320 // Add an edge to node given by "to_i" from any field of adr_i whose offset | |
| 321 // matches "offset" A deferred edge is added if to_i is a LocalVar, and | |
| 322 // a pointsto edge is added if it is a JavaObject | |
| 323 | |
| 324 void ConnectionGraph::add_edge_from_fields(uint adr_i, uint to_i, int offs) { | |
| 325 PointsToNode an = _nodes->at_grow(adr_i); | |
| 326 PointsToNode to = _nodes->at_grow(to_i); | |
| 327 bool deferred = (to.node_type() == PointsToNode::LocalVar); | |
| 328 | |
| 329 for (uint fe = 0; fe < an.edge_count(); fe++) { | |
| 330 assert(an.edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); | |
| 331 int fi = an.edge_target(fe); | |
| 332 PointsToNode pf = _nodes->at_grow(fi); | |
| 333 int po = pf.offset(); | |
| 334 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) { | |
| 335 if (deferred) | |
| 336 add_deferred_edge(fi, to_i); | |
| 337 else | |
| 338 add_pointsto_edge(fi, to_i); | |
| 339 } | |
| 340 } | |
| 341 } | |
| 342 | |
| 65 | 343 // Add a deferred edge from node given by "from_i" to any field of adr_i |
| 344 // whose offset matches "offset". | |
| 0 | 345 void ConnectionGraph::add_deferred_edge_to_fields(uint from_i, uint adr_i, int offs) { |
| 346 PointsToNode an = _nodes->at_grow(adr_i); | |
| 347 for (uint fe = 0; fe < an.edge_count(); fe++) { | |
| 348 assert(an.edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); | |
| 349 int fi = an.edge_target(fe); | |
| 350 PointsToNode pf = _nodes->at_grow(fi); | |
| 351 int po = pf.offset(); | |
| 352 if (pf.edge_count() == 0) { | |
| 353 // we have not seen any stores to this field, assume it was set outside this method | |
| 354 add_pointsto_edge(fi, _phantom_object); | |
| 355 } | |
| 356 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) { | |
| 357 add_deferred_edge(from_i, fi); | |
| 358 } | |
| 359 } | |
| 360 } | |
| 361 | |
| 65 | 362 // Helper functions |
| 363 | |
| 364 static Node* get_addp_base(Node *addp) { | |
| 365 assert(addp->is_AddP(), "must be AddP"); | |
| 366 // | |
| 367 // AddP cases for Base and Address inputs: | |
| 368 // case #1. Direct object's field reference: | |
| 369 // Allocate | |
| 370 // | | |
| 371 // Proj #5 ( oop result ) | |
| 372 // | | |
| 373 // CheckCastPP (cast to instance type) | |
| 374 // | | | |
| 375 // AddP ( base == address ) | |
| 376 // | |
| 377 // case #2. Indirect object's field reference: | |
| 378 // Phi | |
| 379 // | | |
| 380 // CastPP (cast to instance type) | |
| 381 // | | | |
| 382 // AddP ( base == address ) | |
| 383 // | |
| 384 // case #3. Raw object's field reference for Initialize node: | |
| 385 // Allocate | |
| 386 // | | |
| 387 // Proj #5 ( oop result ) | |
| 388 // top | | |
| 389 // \ | | |
| 390 // AddP ( base == top ) | |
| 391 // | |
| 392 // case #4. Array's element reference: | |
| 393 // {CheckCastPP | CastPP} | |
| 394 // | | | | |
| 395 // | AddP ( array's element offset ) | |
| 396 // | | | |
| 397 // AddP ( array's offset ) | |
| 398 // | |
| 399 // case #5. Raw object's field reference for arraycopy stub call: | |
| 400 // The inline_native_clone() case when the arraycopy stub is called | |
| 401 // after the allocation before Initialize and CheckCastPP nodes. | |
| 402 // Allocate | |
| 403 // | | |
| 404 // Proj #5 ( oop result ) | |
| 405 // | | | |
| 406 // AddP ( base == address ) | |
| 407 // | |
| 77 | 408 // case #6. Constant Pool, ThreadLocal, CastX2P or |
| 409 // Raw object's field reference: | |
| 410 // {ConP, ThreadLocal, CastX2P, raw Load} | |
| 65 | 411 // top | |
| 412 // \ | | |
| 413 // AddP ( base == top ) | |
| 414 // | |
| 77 | 415 // case #7. Klass's field reference. |
| 416 // LoadKlass | |
| 417 // | | | |
| 418 // AddP ( base == address ) | |
| 419 // | |
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420 // case #8. narrow Klass's field reference. |
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421 // LoadNKlass |
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422 // | |
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423 // DecodeN |
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424 // | | |
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425 // AddP ( base == address ) |
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426 // |
| 65 | 427 Node *base = addp->in(AddPNode::Base)->uncast(); |
| 428 if (base->is_top()) { // The AddP case #3 and #6. | |
| 429 base = addp->in(AddPNode::Address)->uncast(); | |
| 430 assert(base->Opcode() == Op_ConP || base->Opcode() == Op_ThreadLocal || | |
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431 base->Opcode() == Op_CastX2P || base->is_DecodeN() || |
| 77 | 432 (base->is_Mem() && base->bottom_type() == TypeRawPtr::NOTNULL) || |
| 433 (base->is_Proj() && base->in(0)->is_Allocate()), "sanity"); | |
| 0 | 434 } |
| 65 | 435 return base; |
| 436 } | |
| 437 | |
| 438 static Node* find_second_addp(Node* addp, Node* n) { | |
| 439 assert(addp->is_AddP() && addp->outcnt() > 0, "Don't process dead nodes"); | |
| 440 | |
| 441 Node* addp2 = addp->raw_out(0); | |
| 442 if (addp->outcnt() == 1 && addp2->is_AddP() && | |
| 443 addp2->in(AddPNode::Base) == n && | |
| 444 addp2->in(AddPNode::Address) == addp) { | |
| 445 | |
| 446 assert(addp->in(AddPNode::Base) == n, "expecting the same base"); | |
| 447 // | |
| 448 // Find array's offset to push it on worklist first and | |
| 449 // as result process an array's element offset first (pushed second) | |
| 450 // to avoid CastPP for the array's offset. | |
| 451 // Otherwise the inserted CastPP (LocalVar) will point to what | |
| 452 // the AddP (Field) points to. Which would be wrong since | |
| 453 // the algorithm expects the CastPP has the same point as | |
| 454 // as AddP's base CheckCastPP (LocalVar). | |
| 455 // | |
| 456 // ArrayAllocation | |
| 457 // | | |
| 458 // CheckCastPP | |
| 459 // | | |
| 460 // memProj (from ArrayAllocation CheckCastPP) | |
| 461 // | || | |
| 462 // | || Int (element index) | |
| 463 // | || | ConI (log(element size)) | |
| 464 // | || | / | |
| 465 // | || LShift | |
| 466 // | || / | |
| 467 // | AddP (array's element offset) | |
| 468 // | | | |
| 469 // | | ConI (array's offset: #12(32-bits) or #24(64-bits)) | |
| 470 // | / / | |
| 471 // AddP (array's offset) | |
| 472 // | | |
| 473 // Load/Store (memory operation on array's element) | |
| 474 // | |
| 475 return addp2; | |
| 476 } | |
| 477 return NULL; | |
| 0 | 478 } |
| 479 | |
| 480 // | |
| 481 // Adjust the type and inputs of an AddP which computes the | |
| 482 // address of a field of an instance | |
| 483 // | |
| 484 void ConnectionGraph::split_AddP(Node *addp, Node *base, PhaseGVN *igvn) { | |
| 65 | 485 const TypeOopPtr *base_t = igvn->type(base)->isa_oopptr(); |
| 486 assert(base_t != NULL && base_t->is_instance(), "expecting instance oopptr"); | |
| 0 | 487 const TypeOopPtr *t = igvn->type(addp)->isa_oopptr(); |
| 65 | 488 if (t == NULL) { |
| 489 // We are computing a raw address for a store captured by an Initialize | |
| 490 // compute an appropriate address type. | |
| 491 assert(igvn->type(addp) == TypeRawPtr::NOTNULL, "must be raw pointer"); | |
| 492 assert(addp->in(AddPNode::Address)->is_Proj(), "base of raw address must be result projection from allocation"); | |
| 493 int offs = (int)igvn->find_intptr_t_con(addp->in(AddPNode::Offset), Type::OffsetBot); | |
| 494 assert(offs != Type::OffsetBot, "offset must be a constant"); | |
| 495 t = base_t->add_offset(offs)->is_oopptr(); | |
| 496 } | |
| 0 | 497 uint inst_id = base_t->instance_id(); |
| 498 assert(!t->is_instance() || t->instance_id() == inst_id, | |
| 499 "old type must be non-instance or match new type"); | |
| 500 const TypeOopPtr *tinst = base_t->add_offset(t->offset())->is_oopptr(); | |
| 65 | 501 // Do NOT remove the next call: ensure an new alias index is allocated |
| 502 // for the instance type | |
| 0 | 503 int alias_idx = _compile->get_alias_index(tinst); |
| 504 igvn->set_type(addp, tinst); | |
| 505 // record the allocation in the node map | |
| 506 set_map(addp->_idx, get_map(base->_idx)); | |
| 65 | 507 // if the Address input is not the appropriate instance type |
| 508 // (due to intervening casts,) insert a cast | |
| 0 | 509 Node *adr = addp->in(AddPNode::Address); |
| 510 const TypeOopPtr *atype = igvn->type(adr)->isa_oopptr(); | |
| 65 | 511 if (atype != NULL && atype->instance_id() != inst_id) { |
| 0 | 512 assert(!atype->is_instance(), "no conflicting instances"); |
| 513 const TypeOopPtr *new_atype = base_t->add_offset(atype->offset())->isa_oopptr(); | |
| 514 Node *acast = new (_compile, 2) CastPPNode(adr, new_atype); | |
| 515 acast->set_req(0, adr->in(0)); | |
| 516 igvn->set_type(acast, new_atype); | |
| 517 record_for_optimizer(acast); | |
| 518 Node *bcast = acast; | |
| 519 Node *abase = addp->in(AddPNode::Base); | |
| 520 if (abase != adr) { | |
| 521 bcast = new (_compile, 2) CastPPNode(abase, base_t); | |
| 522 bcast->set_req(0, abase->in(0)); | |
| 523 igvn->set_type(bcast, base_t); | |
| 524 record_for_optimizer(bcast); | |
| 525 } | |
| 526 igvn->hash_delete(addp); | |
| 527 addp->set_req(AddPNode::Base, bcast); | |
| 528 addp->set_req(AddPNode::Address, acast); | |
| 529 igvn->hash_insert(addp); | |
| 530 } | |
| 65 | 531 // Put on IGVN worklist since at least addp's type was changed above. |
| 532 record_for_optimizer(addp); | |
| 0 | 533 } |
| 534 | |
| 535 // | |
| 536 // Create a new version of orig_phi if necessary. Returns either the newly | |
| 537 // created phi or an existing phi. Sets create_new to indicate wheter a new | |
| 538 // phi was created. Cache the last newly created phi in the node map. | |
| 539 // | |
| 540 PhiNode *ConnectionGraph::create_split_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn, bool &new_created) { | |
| 541 Compile *C = _compile; | |
| 542 new_created = false; | |
| 543 int phi_alias_idx = C->get_alias_index(orig_phi->adr_type()); | |
| 544 // nothing to do if orig_phi is bottom memory or matches alias_idx | |
| 65 | 545 if (phi_alias_idx == alias_idx) { |
| 0 | 546 return orig_phi; |
| 547 } | |
| 548 // have we already created a Phi for this alias index? | |
| 549 PhiNode *result = get_map_phi(orig_phi->_idx); | |
| 550 if (result != NULL && C->get_alias_index(result->adr_type()) == alias_idx) { | |
| 551 return result; | |
| 552 } | |
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553 if ((int)C->unique() + 2*NodeLimitFudgeFactor > MaxNodeLimit) { |
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554 if (C->do_escape_analysis() == true && !C->failing()) { |
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555 // Retry compilation without escape analysis. |
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556 // If this is the first failure, the sentinel string will "stick" |
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557 // to the Compile object, and the C2Compiler will see it and retry. |
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558 C->record_failure(C2Compiler::retry_no_escape_analysis()); |
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559 } |
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560 return NULL; |
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561 } |
| 0 | 562 orig_phi_worklist.append_if_missing(orig_phi); |
| 65 | 563 const TypePtr *atype = C->get_adr_type(alias_idx); |
| 0 | 564 result = PhiNode::make(orig_phi->in(0), NULL, Type::MEMORY, atype); |
| 565 set_map_phi(orig_phi->_idx, result); | |
| 566 igvn->set_type(result, result->bottom_type()); | |
| 567 record_for_optimizer(result); | |
| 568 new_created = true; | |
| 569 return result; | |
| 570 } | |
| 571 | |
| 572 // | |
| 573 // Return a new version of Memory Phi "orig_phi" with the inputs having the | |
| 574 // specified alias index. | |
| 575 // | |
| 576 PhiNode *ConnectionGraph::split_memory_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn) { | |
| 577 | |
| 578 assert(alias_idx != Compile::AliasIdxBot, "can't split out bottom memory"); | |
| 579 Compile *C = _compile; | |
| 580 bool new_phi_created; | |
| 65 | 581 PhiNode *result = create_split_phi(orig_phi, alias_idx, orig_phi_worklist, igvn, new_phi_created); |
| 0 | 582 if (!new_phi_created) { |
| 583 return result; | |
| 584 } | |
| 585 | |
| 586 GrowableArray<PhiNode *> phi_list; | |
| 587 GrowableArray<uint> cur_input; | |
| 588 | |
| 589 PhiNode *phi = orig_phi; | |
| 590 uint idx = 1; | |
| 591 bool finished = false; | |
| 592 while(!finished) { | |
| 593 while (idx < phi->req()) { | |
| 65 | 594 Node *mem = find_inst_mem(phi->in(idx), alias_idx, orig_phi_worklist, igvn); |
| 0 | 595 if (mem != NULL && mem->is_Phi()) { |
| 65 | 596 PhiNode *newphi = create_split_phi(mem->as_Phi(), alias_idx, orig_phi_worklist, igvn, new_phi_created); |
| 0 | 597 if (new_phi_created) { |
| 598 // found an phi for which we created a new split, push current one on worklist and begin | |
| 599 // processing new one | |
| 600 phi_list.push(phi); | |
| 601 cur_input.push(idx); | |
| 602 phi = mem->as_Phi(); | |
| 65 | 603 result = newphi; |
| 0 | 604 idx = 1; |
| 605 continue; | |
| 606 } else { | |
| 65 | 607 mem = newphi; |
| 0 | 608 } |
| 609 } | |
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610 if (C->failing()) { |
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611 return NULL; |
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612 } |
| 0 | 613 result->set_req(idx++, mem); |
| 614 } | |
| 615 #ifdef ASSERT | |
| 616 // verify that the new Phi has an input for each input of the original | |
| 617 assert( phi->req() == result->req(), "must have same number of inputs."); | |
| 618 assert( result->in(0) != NULL && result->in(0) == phi->in(0), "regions must match"); | |
| 65 | 619 #endif |
| 620 // Check if all new phi's inputs have specified alias index. | |
| 621 // Otherwise use old phi. | |
| 0 | 622 for (uint i = 1; i < phi->req(); i++) { |
| 65 | 623 Node* in = result->in(i); |
| 624 assert((phi->in(i) == NULL) == (in == NULL), "inputs must correspond."); | |
| 0 | 625 } |
| 626 // we have finished processing a Phi, see if there are any more to do | |
| 627 finished = (phi_list.length() == 0 ); | |
| 628 if (!finished) { | |
| 629 phi = phi_list.pop(); | |
| 630 idx = cur_input.pop(); | |
| 65 | 631 PhiNode *prev_result = get_map_phi(phi->_idx); |
| 632 prev_result->set_req(idx++, result); | |
| 633 result = prev_result; | |
| 0 | 634 } |
| 635 } | |
| 636 return result; | |
| 637 } | |
| 638 | |
| 65 | 639 |
| 640 // | |
| 641 // The next methods are derived from methods in MemNode. | |
| 642 // | |
| 643 static Node *step_through_mergemem(MergeMemNode *mmem, int alias_idx, const TypeOopPtr *tinst) { | |
| 644 Node *mem = mmem; | |
| 645 // TypeInstPtr::NOTNULL+any is an OOP with unknown offset - generally | |
| 646 // means an array I have not precisely typed yet. Do not do any | |
| 647 // alias stuff with it any time soon. | |
| 648 if( tinst->base() != Type::AnyPtr && | |
| 649 !(tinst->klass()->is_java_lang_Object() && | |
| 650 tinst->offset() == Type::OffsetBot) ) { | |
| 651 mem = mmem->memory_at(alias_idx); | |
| 652 // Update input if it is progress over what we have now | |
| 653 } | |
| 654 return mem; | |
| 655 } | |
| 656 | |
| 657 // | |
| 658 // Search memory chain of "mem" to find a MemNode whose address | |
| 659 // is the specified alias index. | |
| 660 // | |
| 661 Node* ConnectionGraph::find_inst_mem(Node *orig_mem, int alias_idx, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *phase) { | |
| 662 if (orig_mem == NULL) | |
| 663 return orig_mem; | |
| 664 Compile* C = phase->C; | |
| 665 const TypeOopPtr *tinst = C->get_adr_type(alias_idx)->isa_oopptr(); | |
| 666 bool is_instance = (tinst != NULL) && tinst->is_instance(); | |
| 667 Node *prev = NULL; | |
| 668 Node *result = orig_mem; | |
| 669 while (prev != result) { | |
| 670 prev = result; | |
| 671 if (result->is_Mem()) { | |
| 672 MemNode *mem = result->as_Mem(); | |
| 673 const Type *at = phase->type(mem->in(MemNode::Address)); | |
| 674 if (at != Type::TOP) { | |
| 675 assert (at->isa_ptr() != NULL, "pointer type required."); | |
| 676 int idx = C->get_alias_index(at->is_ptr()); | |
| 677 if (idx == alias_idx) | |
| 678 break; | |
| 679 } | |
| 680 result = mem->in(MemNode::Memory); | |
| 681 } | |
| 682 if (!is_instance) | |
| 683 continue; // don't search further for non-instance types | |
| 684 // skip over a call which does not affect this memory slice | |
| 685 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { | |
| 686 Node *proj_in = result->in(0); | |
| 687 if (proj_in->is_Call()) { | |
| 688 CallNode *call = proj_in->as_Call(); | |
| 689 if (!call->may_modify(tinst, phase)) { | |
| 690 result = call->in(TypeFunc::Memory); | |
| 691 } | |
| 692 } else if (proj_in->is_Initialize()) { | |
| 693 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); | |
| 694 // Stop if this is the initialization for the object instance which | |
| 695 // which contains this memory slice, otherwise skip over it. | |
| 696 if (alloc == NULL || alloc->_idx != tinst->instance_id()) { | |
| 697 result = proj_in->in(TypeFunc::Memory); | |
| 698 } | |
| 699 } else if (proj_in->is_MemBar()) { | |
| 700 result = proj_in->in(TypeFunc::Memory); | |
| 701 } | |
| 702 } else if (result->is_MergeMem()) { | |
| 703 MergeMemNode *mmem = result->as_MergeMem(); | |
| 704 result = step_through_mergemem(mmem, alias_idx, tinst); | |
| 705 if (result == mmem->base_memory()) { | |
| 706 // Didn't find instance memory, search through general slice recursively. | |
| 707 result = mmem->memory_at(C->get_general_index(alias_idx)); | |
| 708 result = find_inst_mem(result, alias_idx, orig_phis, phase); | |
| 709 if (C->failing()) { | |
| 710 return NULL; | |
| 711 } | |
| 712 mmem->set_memory_at(alias_idx, result); | |
| 713 } | |
| 714 } else if (result->is_Phi() && | |
| 715 C->get_alias_index(result->as_Phi()->adr_type()) != alias_idx) { | |
| 716 Node *un = result->as_Phi()->unique_input(phase); | |
| 717 if (un != NULL) { | |
| 718 result = un; | |
| 719 } else { | |
| 720 break; | |
| 721 } | |
| 722 } | |
| 723 } | |
| 724 if (is_instance && result->is_Phi()) { | |
| 725 PhiNode *mphi = result->as_Phi(); | |
| 726 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); | |
| 727 const TypePtr *t = mphi->adr_type(); | |
| 728 if (C->get_alias_index(t) != alias_idx) { | |
| 729 result = split_memory_phi(mphi, alias_idx, orig_phis, phase); | |
| 730 } | |
| 731 } | |
| 732 // the result is either MemNode, PhiNode, InitializeNode. | |
| 733 return result; | |
| 734 } | |
| 735 | |
| 736 | |
| 0 | 737 // |
| 738 // Convert the types of unescaped object to instance types where possible, | |
| 739 // propagate the new type information through the graph, and update memory | |
| 740 // edges and MergeMem inputs to reflect the new type. | |
| 741 // | |
| 742 // We start with allocations (and calls which may be allocations) on alloc_worklist. | |
| 743 // The processing is done in 4 phases: | |
| 744 // | |
| 745 // Phase 1: Process possible allocations from alloc_worklist. Create instance | |
| 746 // types for the CheckCastPP for allocations where possible. | |
| 747 // Propagate the the new types through users as follows: | |
| 748 // casts and Phi: push users on alloc_worklist | |
| 749 // AddP: cast Base and Address inputs to the instance type | |
| 750 // push any AddP users on alloc_worklist and push any memnode | |
| 751 // users onto memnode_worklist. | |
| 752 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and | |
| 753 // search the Memory chain for a store with the appropriate type | |
| 754 // address type. If a Phi is found, create a new version with | |
| 755 // the approriate memory slices from each of the Phi inputs. | |
| 756 // For stores, process the users as follows: | |
| 757 // MemNode: push on memnode_worklist | |
| 758 // MergeMem: push on mergemem_worklist | |
| 759 // Phase 3: Process MergeMem nodes from mergemem_worklist. Walk each memory slice | |
| 760 // moving the first node encountered of each instance type to the | |
| 761 // the input corresponding to its alias index. | |
| 762 // appropriate memory slice. | |
| 763 // Phase 4: Update the inputs of non-instance memory Phis and the Memory input of memnodes. | |
| 764 // | |
| 765 // In the following example, the CheckCastPP nodes are the cast of allocation | |
| 766 // results and the allocation of node 29 is unescaped and eligible to be an | |
| 767 // instance type. | |
| 768 // | |
| 769 // We start with: | |
| 770 // | |
| 771 // 7 Parm #memory | |
| 772 // 10 ConI "12" | |
| 773 // 19 CheckCastPP "Foo" | |
| 774 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
| 775 // 29 CheckCastPP "Foo" | |
| 776 // 30 AddP _ 29 29 10 Foo+12 alias_index=4 | |
| 777 // | |
| 778 // 40 StoreP 25 7 20 ... alias_index=4 | |
| 779 // 50 StoreP 35 40 30 ... alias_index=4 | |
| 780 // 60 StoreP 45 50 20 ... alias_index=4 | |
| 781 // 70 LoadP _ 60 30 ... alias_index=4 | |
| 782 // 80 Phi 75 50 60 Memory alias_index=4 | |
| 783 // 90 LoadP _ 80 30 ... alias_index=4 | |
| 784 // 100 LoadP _ 80 20 ... alias_index=4 | |
| 785 // | |
| 786 // | |
| 787 // Phase 1 creates an instance type for node 29 assigning it an instance id of 24 | |
| 788 // and creating a new alias index for node 30. This gives: | |
| 789 // | |
| 790 // 7 Parm #memory | |
| 791 // 10 ConI "12" | |
| 792 // 19 CheckCastPP "Foo" | |
| 793 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
| 794 // 29 CheckCastPP "Foo" iid=24 | |
| 795 // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24 | |
| 796 // | |
| 797 // 40 StoreP 25 7 20 ... alias_index=4 | |
| 798 // 50 StoreP 35 40 30 ... alias_index=6 | |
| 799 // 60 StoreP 45 50 20 ... alias_index=4 | |
| 800 // 70 LoadP _ 60 30 ... alias_index=6 | |
| 801 // 80 Phi 75 50 60 Memory alias_index=4 | |
| 802 // 90 LoadP _ 80 30 ... alias_index=6 | |
| 803 // 100 LoadP _ 80 20 ... alias_index=4 | |
| 804 // | |
| 805 // In phase 2, new memory inputs are computed for the loads and stores, | |
| 806 // And a new version of the phi is created. In phase 4, the inputs to | |
| 807 // node 80 are updated and then the memory nodes are updated with the | |
| 808 // values computed in phase 2. This results in: | |
| 809 // | |
| 810 // 7 Parm #memory | |
| 811 // 10 ConI "12" | |
| 812 // 19 CheckCastPP "Foo" | |
| 813 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
| 814 // 29 CheckCastPP "Foo" iid=24 | |
| 815 // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24 | |
| 816 // | |
| 817 // 40 StoreP 25 7 20 ... alias_index=4 | |
| 818 // 50 StoreP 35 7 30 ... alias_index=6 | |
| 819 // 60 StoreP 45 40 20 ... alias_index=4 | |
| 820 // 70 LoadP _ 50 30 ... alias_index=6 | |
| 821 // 80 Phi 75 40 60 Memory alias_index=4 | |
| 822 // 120 Phi 75 50 50 Memory alias_index=6 | |
| 823 // 90 LoadP _ 120 30 ... alias_index=6 | |
| 824 // 100 LoadP _ 80 20 ... alias_index=4 | |
| 825 // | |
| 826 void ConnectionGraph::split_unique_types(GrowableArray<Node *> &alloc_worklist) { | |
| 827 GrowableArray<Node *> memnode_worklist; | |
| 828 GrowableArray<Node *> mergemem_worklist; | |
| 829 GrowableArray<PhiNode *> orig_phis; | |
| 830 PhaseGVN *igvn = _compile->initial_gvn(); | |
| 831 uint new_index_start = (uint) _compile->num_alias_types(); | |
| 832 VectorSet visited(Thread::current()->resource_area()); | |
| 833 VectorSet ptset(Thread::current()->resource_area()); | |
| 834 | |
| 65 | 835 |
| 836 // Phase 1: Process possible allocations from alloc_worklist. | |
| 837 // Create instance types for the CheckCastPP for allocations where possible. | |
| 0 | 838 while (alloc_worklist.length() != 0) { |
| 839 Node *n = alloc_worklist.pop(); | |
| 840 uint ni = n->_idx; | |
| 65 | 841 const TypeOopPtr* tinst = NULL; |
| 0 | 842 if (n->is_Call()) { |
| 843 CallNode *alloc = n->as_Call(); | |
| 844 // copy escape information to call node | |
| 65 | 845 PointsToNode* ptn = _nodes->adr_at(alloc->_idx); |
| 0 | 846 PointsToNode::EscapeState es = escape_state(alloc, igvn); |
| 65 | 847 // We have an allocation or call which returns a Java object, |
| 848 // see if it is unescaped. | |
| 849 if (es != PointsToNode::NoEscape || !ptn->_scalar_replaceable) | |
| 0 | 850 continue; |
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851 if (alloc->is_Allocate()) { |
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852 // Set the scalar_replaceable flag before the next check. |
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853 alloc->as_Allocate()->_is_scalar_replaceable = true; |
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854 } |
| 65 | 855 // find CheckCastPP of call return value |
| 856 n = alloc->result_cast(); | |
| 857 if (n == NULL || // No uses accept Initialize or | |
| 858 !n->is_CheckCastPP()) // not unique CheckCastPP. | |
| 859 continue; | |
| 860 // The inline code for Object.clone() casts the allocation result to | |
| 861 // java.lang.Object and then to the the actual type of the allocated | |
| 862 // object. Detect this case and use the second cast. | |
| 863 if (alloc->is_Allocate() && n->as_Type()->type() == TypeInstPtr::NOTNULL | |
| 864 && igvn->type(alloc->in(AllocateNode::KlassNode)) != TypeKlassPtr::OBJECT) { | |
| 865 Node *cast2 = NULL; | |
| 866 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 867 Node *use = n->fast_out(i); | |
| 868 if (use->is_CheckCastPP()) { | |
| 869 cast2 = use; | |
| 870 break; | |
| 871 } | |
| 872 } | |
| 873 if (cast2 != NULL) { | |
| 874 n = cast2; | |
| 875 } else { | |
| 876 continue; | |
| 877 } | |
| 878 } | |
| 879 set_escape_state(n->_idx, es); | |
| 880 // in order for an object to be stackallocatable, it must be: | |
| 881 // - a direct allocation (not a call returning an object) | |
| 882 // - non-escaping | |
| 883 // - eligible to be a unique type | |
| 884 // - not determined to be ineligible by escape analysis | |
| 0 | 885 set_map(alloc->_idx, n); |
| 886 set_map(n->_idx, alloc); | |
| 65 | 887 const TypeOopPtr *t = igvn->type(n)->isa_oopptr(); |
| 888 if (t == NULL) | |
| 0 | 889 continue; // not a TypeInstPtr |
| 65 | 890 tinst = t->cast_to_instance(ni); |
| 0 | 891 igvn->hash_delete(n); |
| 892 igvn->set_type(n, tinst); | |
| 893 n->raise_bottom_type(tinst); | |
| 894 igvn->hash_insert(n); | |
| 65 | 895 record_for_optimizer(n); |
| 896 if (alloc->is_Allocate() && ptn->_scalar_replaceable && | |
| 897 (t->isa_instptr() || t->isa_aryptr())) { | |
| 163 | 898 |
| 899 // First, put on the worklist all Field edges from Connection Graph | |
| 900 // which is more accurate then putting immediate users from Ideal Graph. | |
| 901 for (uint e = 0; e < ptn->edge_count(); e++) { | |
| 902 Node *use = _nodes->adr_at(ptn->edge_target(e))->_node; | |
| 903 assert(ptn->edge_type(e) == PointsToNode::FieldEdge && use->is_AddP(), | |
| 904 "only AddP nodes are Field edges in CG"); | |
| 905 if (use->outcnt() > 0) { // Don't process dead nodes | |
| 906 Node* addp2 = find_second_addp(use, use->in(AddPNode::Base)); | |
| 907 if (addp2 != NULL) { | |
| 908 assert(alloc->is_AllocateArray(),"array allocation was expected"); | |
| 909 alloc_worklist.append_if_missing(addp2); | |
| 910 } | |
| 911 alloc_worklist.append_if_missing(use); | |
| 912 } | |
| 913 } | |
| 914 | |
| 65 | 915 // An allocation may have an Initialize which has raw stores. Scan |
| 916 // the users of the raw allocation result and push AddP users | |
| 917 // on alloc_worklist. | |
| 918 Node *raw_result = alloc->proj_out(TypeFunc::Parms); | |
| 919 assert (raw_result != NULL, "must have an allocation result"); | |
| 920 for (DUIterator_Fast imax, i = raw_result->fast_outs(imax); i < imax; i++) { | |
| 921 Node *use = raw_result->fast_out(i); | |
| 922 if (use->is_AddP() && use->outcnt() > 0) { // Don't process dead nodes | |
| 923 Node* addp2 = find_second_addp(use, raw_result); | |
| 924 if (addp2 != NULL) { | |
| 925 assert(alloc->is_AllocateArray(),"array allocation was expected"); | |
| 926 alloc_worklist.append_if_missing(addp2); | |
| 927 } | |
| 928 alloc_worklist.append_if_missing(use); | |
| 929 } else if (use->is_Initialize()) { | |
| 930 memnode_worklist.append_if_missing(use); | |
| 931 } | |
| 932 } | |
| 933 } | |
| 0 | 934 } else if (n->is_AddP()) { |
| 935 ptset.Clear(); | |
| 65 | 936 PointsTo(ptset, get_addp_base(n), igvn); |
| 0 | 937 assert(ptset.Size() == 1, "AddP address is unique"); |
| 65 | 938 uint elem = ptset.getelem(); // Allocation node's index |
| 939 if (elem == _phantom_object) | |
| 940 continue; // Assume the value was set outside this method. | |
| 941 Node *base = get_map(elem); // CheckCastPP node | |
| 0 | 942 split_AddP(n, base, igvn); |
| 65 | 943 tinst = igvn->type(base)->isa_oopptr(); |
| 944 } else if (n->is_Phi() || | |
| 945 n->is_CheckCastPP() || | |
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946 n->is_EncodeP() || |
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947 n->is_DecodeN() || |
| 65 | 948 (n->is_ConstraintCast() && n->Opcode() == Op_CastPP)) { |
| 0 | 949 if (visited.test_set(n->_idx)) { |
| 950 assert(n->is_Phi(), "loops only through Phi's"); | |
| 951 continue; // already processed | |
| 952 } | |
| 953 ptset.Clear(); | |
| 954 PointsTo(ptset, n, igvn); | |
| 955 if (ptset.Size() == 1) { | |
| 65 | 956 uint elem = ptset.getelem(); // Allocation node's index |
| 957 if (elem == _phantom_object) | |
| 958 continue; // Assume the value was set outside this method. | |
| 959 Node *val = get_map(elem); // CheckCastPP node | |
| 0 | 960 TypeNode *tn = n->as_Type(); |
| 65 | 961 tinst = igvn->type(val)->isa_oopptr(); |
| 962 assert(tinst != NULL && tinst->is_instance() && | |
| 963 tinst->instance_id() == elem , "instance type expected."); | |
| 163 | 964 |
| 965 const TypeOopPtr *tn_t = NULL; | |
| 966 const Type *tn_type = igvn->type(tn); | |
| 967 if (tn_type->isa_narrowoop()) { | |
| 968 tn_t = tn_type->is_narrowoop()->make_oopptr()->isa_oopptr(); | |
| 969 } else { | |
| 970 tn_t = tn_type->isa_oopptr(); | |
| 971 } | |
| 0 | 972 |
| 65 | 973 if (tn_t != NULL && |
| 974 tinst->cast_to_instance(TypeOopPtr::UNKNOWN_INSTANCE)->higher_equal(tn_t)) { | |
| 163 | 975 if (tn_type->isa_narrowoop()) { |
| 976 tn_type = tinst->make_narrowoop(); | |
| 977 } else { | |
| 978 tn_type = tinst; | |
| 979 } | |
| 0 | 980 igvn->hash_delete(tn); |
| 163 | 981 igvn->set_type(tn, tn_type); |
| 982 tn->set_type(tn_type); | |
| 0 | 983 igvn->hash_insert(tn); |
| 65 | 984 record_for_optimizer(n); |
| 0 | 985 } |
| 986 } | |
| 987 } else { | |
| 988 continue; | |
| 989 } | |
| 990 // push users on appropriate worklist | |
| 991 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 992 Node *use = n->fast_out(i); | |
| 993 if(use->is_Mem() && use->in(MemNode::Address) == n) { | |
| 65 | 994 memnode_worklist.append_if_missing(use); |
| 995 } else if (use->is_Initialize()) { | |
| 996 memnode_worklist.append_if_missing(use); | |
| 997 } else if (use->is_MergeMem()) { | |
| 998 mergemem_worklist.append_if_missing(use); | |
| 999 } else if (use->is_Call() && tinst != NULL) { | |
| 1000 // Look for MergeMem nodes for calls which reference unique allocation | |
| 1001 // (through CheckCastPP nodes) even for debug info. | |
| 1002 Node* m = use->in(TypeFunc::Memory); | |
| 1003 uint iid = tinst->instance_id(); | |
| 1004 while (m->is_Proj() && m->in(0)->is_Call() && | |
| 1005 m->in(0) != use && !m->in(0)->_idx != iid) { | |
| 1006 m = m->in(0)->in(TypeFunc::Memory); | |
| 1007 } | |
| 1008 if (m->is_MergeMem()) { | |
| 1009 mergemem_worklist.append_if_missing(m); | |
| 1010 } | |
| 1011 } else if (use->is_AddP() && use->outcnt() > 0) { // No dead nodes | |
| 1012 Node* addp2 = find_second_addp(use, n); | |
| 1013 if (addp2 != NULL) { | |
| 1014 alloc_worklist.append_if_missing(addp2); | |
| 1015 } | |
| 1016 alloc_worklist.append_if_missing(use); | |
| 1017 } else if (use->is_Phi() || | |
| 1018 use->is_CheckCastPP() || | |
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1019 use->is_EncodeP() || |
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1020 use->is_DecodeN() || |
| 65 | 1021 (use->is_ConstraintCast() && use->Opcode() == Op_CastPP)) { |
| 1022 alloc_worklist.append_if_missing(use); | |
| 0 | 1023 } |
| 1024 } | |
| 1025 | |
| 1026 } | |
| 65 | 1027 // New alias types were created in split_AddP(). |
| 0 | 1028 uint new_index_end = (uint) _compile->num_alias_types(); |
| 1029 | |
| 1030 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and | |
| 1031 // compute new values for Memory inputs (the Memory inputs are not | |
| 1032 // actually updated until phase 4.) | |
| 1033 if (memnode_worklist.length() == 0) | |
| 1034 return; // nothing to do | |
| 1035 | |
| 1036 while (memnode_worklist.length() != 0) { | |
| 1037 Node *n = memnode_worklist.pop(); | |
| 65 | 1038 if (visited.test_set(n->_idx)) |
| 1039 continue; | |
| 0 | 1040 if (n->is_Phi()) { |
| 1041 assert(n->as_Phi()->adr_type() != TypePtr::BOTTOM, "narrow memory slice required"); | |
| 1042 // we don't need to do anything, but the users must be pushed if we haven't processed | |
| 1043 // this Phi before | |
| 65 | 1044 } else if (n->is_Initialize()) { |
| 1045 // we don't need to do anything, but the users of the memory projection must be pushed | |
| 1046 n = n->as_Initialize()->proj_out(TypeFunc::Memory); | |
| 1047 if (n == NULL) | |
| 0 | 1048 continue; |
| 1049 } else { | |
| 1050 assert(n->is_Mem(), "memory node required."); | |
| 1051 Node *addr = n->in(MemNode::Address); | |
| 65 | 1052 assert(addr->is_AddP(), "AddP required"); |
| 0 | 1053 const Type *addr_t = igvn->type(addr); |
| 1054 if (addr_t == Type::TOP) | |
| 1055 continue; | |
| 1056 assert (addr_t->isa_ptr() != NULL, "pointer type required."); | |
| 1057 int alias_idx = _compile->get_alias_index(addr_t->is_ptr()); | |
| 65 | 1058 assert ((uint)alias_idx < new_index_end, "wrong alias index"); |
| 1059 Node *mem = find_inst_mem(n->in(MemNode::Memory), alias_idx, orig_phis, igvn); | |
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1060 if (_compile->failing()) { |
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1061 return; |
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1062 } |
| 65 | 1063 if (mem != n->in(MemNode::Memory)) { |
| 0 | 1064 set_map(n->_idx, mem); |
| 65 | 1065 _nodes->adr_at(n->_idx)->_node = n; |
| 1066 } | |
| 0 | 1067 if (n->is_Load()) { |
| 1068 continue; // don't push users | |
| 1069 } else if (n->is_LoadStore()) { | |
| 1070 // get the memory projection | |
| 1071 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 1072 Node *use = n->fast_out(i); | |
| 1073 if (use->Opcode() == Op_SCMemProj) { | |
| 1074 n = use; | |
| 1075 break; | |
| 1076 } | |
| 1077 } | |
| 1078 assert(n->Opcode() == Op_SCMemProj, "memory projection required"); | |
| 1079 } | |
| 1080 } | |
| 1081 // push user on appropriate worklist | |
| 1082 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 1083 Node *use = n->fast_out(i); | |
| 1084 if (use->is_Phi()) { | |
| 65 | 1085 memnode_worklist.append_if_missing(use); |
| 0 | 1086 } else if(use->is_Mem() && use->in(MemNode::Memory) == n) { |
| 65 | 1087 memnode_worklist.append_if_missing(use); |
| 1088 } else if (use->is_Initialize()) { | |
| 1089 memnode_worklist.append_if_missing(use); | |
| 0 | 1090 } else if (use->is_MergeMem()) { |
| 65 | 1091 mergemem_worklist.append_if_missing(use); |
| 0 | 1092 } |
| 1093 } | |
| 1094 } | |
| 1095 | |
| 65 | 1096 // Phase 3: Process MergeMem nodes from mergemem_worklist. |
| 1097 // Walk each memory moving the first node encountered of each | |
| 1098 // instance type to the the input corresponding to its alias index. | |
| 0 | 1099 while (mergemem_worklist.length() != 0) { |
| 1100 Node *n = mergemem_worklist.pop(); | |
| 1101 assert(n->is_MergeMem(), "MergeMem node required."); | |
| 65 | 1102 if (visited.test_set(n->_idx)) |
| 1103 continue; | |
| 0 | 1104 MergeMemNode *nmm = n->as_MergeMem(); |
| 1105 // Note: we don't want to use MergeMemStream here because we only want to | |
| 65 | 1106 // scan inputs which exist at the start, not ones we add during processing. |
| 0 | 1107 uint nslices = nmm->req(); |
| 1108 igvn->hash_delete(nmm); | |
| 1109 for (uint i = Compile::AliasIdxRaw+1; i < nslices; i++) { | |
| 65 | 1110 Node* mem = nmm->in(i); |
| 1111 Node* cur = NULL; | |
| 0 | 1112 if (mem == NULL || mem->is_top()) |
| 1113 continue; | |
| 1114 while (mem->is_Mem()) { | |
| 1115 const Type *at = igvn->type(mem->in(MemNode::Address)); | |
| 1116 if (at != Type::TOP) { | |
| 1117 assert (at->isa_ptr() != NULL, "pointer type required."); | |
| 1118 uint idx = (uint)_compile->get_alias_index(at->is_ptr()); | |
| 1119 if (idx == i) { | |
| 1120 if (cur == NULL) | |
| 1121 cur = mem; | |
| 1122 } else { | |
| 1123 if (idx >= nmm->req() || nmm->is_empty_memory(nmm->in(idx))) { | |
| 1124 nmm->set_memory_at(idx, mem); | |
| 1125 } | |
| 1126 } | |
| 1127 } | |
| 1128 mem = mem->in(MemNode::Memory); | |
| 1129 } | |
| 1130 nmm->set_memory_at(i, (cur != NULL) ? cur : mem); | |
| 65 | 1131 // Find any instance of the current type if we haven't encountered |
| 1132 // a value of the instance along the chain. | |
| 1133 for (uint ni = new_index_start; ni < new_index_end; ni++) { | |
| 1134 if((uint)_compile->get_general_index(ni) == i) { | |
| 1135 Node *m = (ni >= nmm->req()) ? nmm->empty_memory() : nmm->in(ni); | |
| 1136 if (nmm->is_empty_memory(m)) { | |
| 1137 Node* result = find_inst_mem(mem, ni, orig_phis, igvn); | |
| 1138 if (_compile->failing()) { | |
| 1139 return; | |
| 1140 } | |
| 1141 nmm->set_memory_at(ni, result); | |
| 1142 } | |
| 1143 } | |
| 1144 } | |
| 1145 } | |
| 1146 // Find the rest of instances values | |
| 1147 for (uint ni = new_index_start; ni < new_index_end; ni++) { | |
| 1148 const TypeOopPtr *tinst = igvn->C->get_adr_type(ni)->isa_oopptr(); | |
| 1149 Node* result = step_through_mergemem(nmm, ni, tinst); | |
| 1150 if (result == nmm->base_memory()) { | |
| 1151 // Didn't find instance memory, search through general slice recursively. | |
| 1152 result = nmm->memory_at(igvn->C->get_general_index(ni)); | |
| 1153 result = find_inst_mem(result, ni, orig_phis, igvn); | |
| 1154 if (_compile->failing()) { | |
| 1155 return; | |
| 1156 } | |
| 1157 nmm->set_memory_at(ni, result); | |
| 1158 } | |
| 1159 } | |
| 1160 igvn->hash_insert(nmm); | |
| 1161 record_for_optimizer(nmm); | |
| 1162 | |
| 1163 // Propagate new memory slices to following MergeMem nodes. | |
| 1164 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 1165 Node *use = n->fast_out(i); | |
| 1166 if (use->is_Call()) { | |
| 1167 CallNode* in = use->as_Call(); | |
| 1168 if (in->proj_out(TypeFunc::Memory) != NULL) { | |
| 1169 Node* m = in->proj_out(TypeFunc::Memory); | |
| 1170 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { | |
| 1171 Node* mm = m->fast_out(j); | |
| 1172 if (mm->is_MergeMem()) { | |
| 1173 mergemem_worklist.append_if_missing(mm); | |
| 1174 } | |
| 1175 } | |
| 1176 } | |
| 1177 if (use->is_Allocate()) { | |
| 1178 use = use->as_Allocate()->initialization(); | |
| 1179 if (use == NULL) { | |
| 1180 continue; | |
| 1181 } | |
| 1182 } | |
| 1183 } | |
| 1184 if (use->is_Initialize()) { | |
| 1185 InitializeNode* in = use->as_Initialize(); | |
| 1186 if (in->proj_out(TypeFunc::Memory) != NULL) { | |
| 1187 Node* m = in->proj_out(TypeFunc::Memory); | |
| 1188 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { | |
| 1189 Node* mm = m->fast_out(j); | |
| 1190 if (mm->is_MergeMem()) { | |
| 1191 mergemem_worklist.append_if_missing(mm); | |
| 0 | 1192 } |
| 1193 } | |
| 1194 } | |
| 1195 } | |
| 1196 } | |
| 1197 } | |
| 1198 | |
| 65 | 1199 // Phase 4: Update the inputs of non-instance memory Phis and |
| 1200 // the Memory input of memnodes | |
| 0 | 1201 // First update the inputs of any non-instance Phi's from |
| 1202 // which we split out an instance Phi. Note we don't have | |
| 1203 // to recursively process Phi's encounted on the input memory | |
| 1204 // chains as is done in split_memory_phi() since they will | |
| 1205 // also be processed here. | |
| 1206 while (orig_phis.length() != 0) { | |
| 1207 PhiNode *phi = orig_phis.pop(); | |
| 1208 int alias_idx = _compile->get_alias_index(phi->adr_type()); | |
| 1209 igvn->hash_delete(phi); | |
| 1210 for (uint i = 1; i < phi->req(); i++) { | |
| 1211 Node *mem = phi->in(i); | |
| 65 | 1212 Node *new_mem = find_inst_mem(mem, alias_idx, orig_phis, igvn); |
| 1213 if (_compile->failing()) { | |
| 1214 return; | |
| 1215 } | |
| 0 | 1216 if (mem != new_mem) { |
| 1217 phi->set_req(i, new_mem); | |
| 1218 } | |
| 1219 } | |
| 1220 igvn->hash_insert(phi); | |
| 1221 record_for_optimizer(phi); | |
| 1222 } | |
| 1223 | |
| 1224 // Update the memory inputs of MemNodes with the value we computed | |
| 1225 // in Phase 2. | |
| 1226 for (int i = 0; i < _nodes->length(); i++) { | |
| 1227 Node *nmem = get_map(i); | |
| 1228 if (nmem != NULL) { | |
| 65 | 1229 Node *n = _nodes->adr_at(i)->_node; |
| 0 | 1230 if (n != NULL && n->is_Mem()) { |
| 1231 igvn->hash_delete(n); | |
| 1232 n->set_req(MemNode::Memory, nmem); | |
| 1233 igvn->hash_insert(n); | |
| 1234 record_for_optimizer(n); | |
| 1235 } | |
| 1236 } | |
| 1237 } | |
| 1238 } | |
| 1239 | |
| 1240 void ConnectionGraph::compute_escape() { | |
| 65 | 1241 |
| 163 | 1242 // 1. Populate Connection Graph (CG) with Ideal nodes. |
| 65 | 1243 |
| 1244 Unique_Node_List worklist_init; | |
| 1245 worklist_init.map(_compile->unique(), NULL); // preallocate space | |
| 1246 | |
| 1247 // Initialize worklist | |
| 1248 if (_compile->root() != NULL) { | |
| 1249 worklist_init.push(_compile->root()); | |
| 1250 } | |
| 1251 | |
| 1252 GrowableArray<int> cg_worklist; | |
| 1253 PhaseGVN* igvn = _compile->initial_gvn(); | |
| 1254 bool has_allocations = false; | |
| 1255 | |
| 1256 // Push all useful nodes onto CG list and set their type. | |
| 1257 for( uint next = 0; next < worklist_init.size(); ++next ) { | |
| 1258 Node* n = worklist_init.at(next); | |
| 1259 record_for_escape_analysis(n, igvn); | |
| 1260 if (n->is_Call() && | |
| 1261 _nodes->adr_at(n->_idx)->node_type() == PointsToNode::JavaObject) { | |
| 1262 has_allocations = true; | |
| 1263 } | |
| 1264 if(n->is_AddP()) | |
| 1265 cg_worklist.append(n->_idx); | |
| 1266 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
| 1267 Node* m = n->fast_out(i); // Get user | |
| 1268 worklist_init.push(m); | |
| 1269 } | |
| 1270 } | |
| 0 | 1271 |
| 65 | 1272 if (has_allocations) { |
| 1273 _has_allocations = true; | |
| 1274 } else { | |
| 1275 _has_allocations = false; | |
| 1276 _collecting = false; | |
| 1277 return; // Nothing to do. | |
| 1278 } | |
| 1279 | |
| 1280 // 2. First pass to create simple CG edges (doesn't require to walk CG). | |
| 1281 for( uint next = 0; next < _delayed_worklist.size(); ++next ) { | |
| 1282 Node* n = _delayed_worklist.at(next); | |
| 1283 build_connection_graph(n, igvn); | |
| 1284 } | |
| 0 | 1285 |
| 65 | 1286 // 3. Pass to create fields edges (Allocate -F-> AddP). |
| 1287 for( int next = 0; next < cg_worklist.length(); ++next ) { | |
| 1288 int ni = cg_worklist.at(next); | |
| 1289 build_connection_graph(_nodes->adr_at(ni)->_node, igvn); | |
| 1290 } | |
| 1291 | |
| 1292 cg_worklist.clear(); | |
| 1293 cg_worklist.append(_phantom_object); | |
| 1294 | |
| 1295 // 4. Build Connection Graph which need | |
| 1296 // to walk the connection graph. | |
| 1297 for (uint ni = 0; ni < (uint)_nodes->length(); ni++) { | |
| 1298 PointsToNode* ptn = _nodes->adr_at(ni); | |
| 1299 Node *n = ptn->_node; | |
| 1300 if (n != NULL) { // Call, AddP, LoadP, StoreP | |
| 1301 build_connection_graph(n, igvn); | |
| 1302 if (ptn->node_type() != PointsToNode::UnknownType) | |
| 1303 cg_worklist.append(n->_idx); // Collect CG nodes | |
| 1304 } | |
| 0 | 1305 } |
| 1306 | |
| 1307 VectorSet ptset(Thread::current()->resource_area()); | |
|
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1308 GrowableArray<Node*> alloc_worklist; |
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1309 GrowableArray<int> worklist; |
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1310 GrowableArray<uint> deferred_edges; |
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1311 VectorSet visited(Thread::current()->resource_area()); |
| 0 | 1312 |
| 1313 // remove deferred edges from the graph and collect | |
| 1314 // information we will need for type splitting | |
| 65 | 1315 for( int next = 0; next < cg_worklist.length(); ++next ) { |
| 1316 int ni = cg_worklist.at(next); | |
| 1317 PointsToNode* ptn = _nodes->adr_at(ni); | |
| 0 | 1318 PointsToNode::NodeType nt = ptn->node_type(); |
| 1319 Node *n = ptn->_node; | |
| 1320 if (nt == PointsToNode::LocalVar || nt == PointsToNode::Field) { | |
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1321 remove_deferred(ni, &deferred_edges, &visited); |
| 0 | 1322 if (n->is_AddP()) { |
| 65 | 1323 // If this AddP computes an address which may point to more that one |
| 163 | 1324 // object or more then one field (array's element), nothing the address |
| 1325 // points to can be scalar replaceable. | |
| 65 | 1326 Node *base = get_addp_base(n); |
| 0 | 1327 ptset.Clear(); |
| 1328 PointsTo(ptset, base, igvn); | |
| 163 | 1329 if (ptset.Size() > 1 || |
| 1330 (ptset.Size() != 0 && ptn->offset() == Type::OffsetBot)) { | |
| 0 | 1331 for( VectorSetI j(&ptset); j.test(); ++j ) { |
| 65 | 1332 uint pt = j.elem; |
| 1333 ptnode_adr(pt)->_scalar_replaceable = false; | |
| 0 | 1334 } |
| 1335 } | |
| 1336 } | |
| 65 | 1337 } else if (nt == PointsToNode::JavaObject && n->is_Call()) { |
| 1338 // Push call on alloc_worlist (alocations are calls) | |
| 1339 // for processing by split_unique_types(). | |
| 1340 alloc_worklist.append(n); | |
| 0 | 1341 } |
| 1342 } | |
| 65 | 1343 |
| 0 | 1344 // push all GlobalEscape nodes on the worklist |
| 65 | 1345 for( int next = 0; next < cg_worklist.length(); ++next ) { |
| 1346 int nk = cg_worklist.at(next); | |
| 1347 if (_nodes->adr_at(nk)->escape_state() == PointsToNode::GlobalEscape) | |
| 1348 worklist.append(nk); | |
| 0 | 1349 } |
| 1350 // mark all node reachable from GlobalEscape nodes | |
| 1351 while(worklist.length() > 0) { | |
| 1352 PointsToNode n = _nodes->at(worklist.pop()); | |
| 1353 for (uint ei = 0; ei < n.edge_count(); ei++) { | |
| 1354 uint npi = n.edge_target(ei); | |
| 1355 PointsToNode *np = ptnode_adr(npi); | |
| 65 | 1356 if (np->escape_state() < PointsToNode::GlobalEscape) { |
| 0 | 1357 np->set_escape_state(PointsToNode::GlobalEscape); |
| 1358 worklist.append_if_missing(npi); | |
| 1359 } | |
| 1360 } | |
| 1361 } | |
| 1362 | |
| 1363 // push all ArgEscape nodes on the worklist | |
| 65 | 1364 for( int next = 0; next < cg_worklist.length(); ++next ) { |
| 1365 int nk = cg_worklist.at(next); | |
| 1366 if (_nodes->adr_at(nk)->escape_state() == PointsToNode::ArgEscape) | |
| 0 | 1367 worklist.push(nk); |
| 1368 } | |
| 1369 // mark all node reachable from ArgEscape nodes | |
| 1370 while(worklist.length() > 0) { | |
| 1371 PointsToNode n = _nodes->at(worklist.pop()); | |
| 1372 for (uint ei = 0; ei < n.edge_count(); ei++) { | |
| 1373 uint npi = n.edge_target(ei); | |
| 1374 PointsToNode *np = ptnode_adr(npi); | |
| 65 | 1375 if (np->escape_state() < PointsToNode::ArgEscape) { |
| 0 | 1376 np->set_escape_state(PointsToNode::ArgEscape); |
| 1377 worklist.append_if_missing(npi); | |
| 1378 } | |
| 1379 } | |
| 1380 } | |
| 65 | 1381 |
| 1382 // push all NoEscape nodes on the worklist | |
| 1383 for( int next = 0; next < cg_worklist.length(); ++next ) { | |
| 1384 int nk = cg_worklist.at(next); | |
| 1385 if (_nodes->adr_at(nk)->escape_state() == PointsToNode::NoEscape) | |
| 1386 worklist.push(nk); | |
| 1387 } | |
| 1388 // mark all node reachable from NoEscape nodes | |
| 1389 while(worklist.length() > 0) { | |
| 1390 PointsToNode n = _nodes->at(worklist.pop()); | |
| 1391 for (uint ei = 0; ei < n.edge_count(); ei++) { | |
| 1392 uint npi = n.edge_target(ei); | |
| 1393 PointsToNode *np = ptnode_adr(npi); | |
| 1394 if (np->escape_state() < PointsToNode::NoEscape) { | |
| 1395 np->set_escape_state(PointsToNode::NoEscape); | |
| 1396 worklist.append_if_missing(npi); | |
| 1397 } | |
| 1398 } | |
| 1399 } | |
| 1400 | |
| 0 | 1401 _collecting = false; |
| 1402 | |
| 65 | 1403 has_allocations = false; // Are there scalar replaceable allocations? |
| 0 | 1404 |
| 65 | 1405 for( int next = 0; next < alloc_worklist.length(); ++next ) { |
| 1406 Node* n = alloc_worklist.at(next); | |
| 1407 uint ni = n->_idx; | |
| 1408 PointsToNode* ptn = _nodes->adr_at(ni); | |
| 1409 PointsToNode::EscapeState es = ptn->escape_state(); | |
| 1410 if (ptn->escape_state() == PointsToNode::NoEscape && | |
| 1411 ptn->_scalar_replaceable) { | |
| 1412 has_allocations = true; | |
| 1413 break; | |
| 1414 } | |
| 0 | 1415 } |
| 65 | 1416 if (!has_allocations) { |
| 1417 return; // Nothing to do. | |
| 1418 } | |
| 0 | 1419 |
| 65 | 1420 if(_compile->AliasLevel() >= 3 && EliminateAllocations) { |
| 1421 // Now use the escape information to create unique types for | |
| 1422 // unescaped objects | |
| 1423 split_unique_types(alloc_worklist); | |
| 1424 if (_compile->failing()) return; | |
| 0 | 1425 |
| 65 | 1426 // Clean up after split unique types. |
| 1427 ResourceMark rm; | |
| 1428 PhaseRemoveUseless pru(_compile->initial_gvn(), _compile->for_igvn()); | |
| 0 | 1429 |
| 65 | 1430 #ifdef ASSERT |
| 1431 } else if (PrintEscapeAnalysis || PrintEliminateAllocations) { | |
| 1432 tty->print("=== No allocations eliminated for "); | |
| 1433 C()->method()->print_short_name(); | |
| 1434 if(!EliminateAllocations) { | |
| 1435 tty->print(" since EliminateAllocations is off ==="); | |
| 1436 } else if(_compile->AliasLevel() < 3) { | |
| 1437 tty->print(" since AliasLevel < 3 ==="); | |
| 0 | 1438 } |
| 65 | 1439 tty->cr(); |
| 1440 #endif | |
| 0 | 1441 } |
| 1442 } | |
| 1443 | |
| 1444 void ConnectionGraph::process_call_arguments(CallNode *call, PhaseTransform *phase) { | |
| 1445 | |
| 1446 switch (call->Opcode()) { | |
| 65 | 1447 #ifdef ASSERT |
| 0 | 1448 case Op_Allocate: |
| 1449 case Op_AllocateArray: | |
| 1450 case Op_Lock: | |
| 1451 case Op_Unlock: | |
| 65 | 1452 assert(false, "should be done already"); |
| 0 | 1453 break; |
| 65 | 1454 #endif |
| 1455 case Op_CallLeafNoFP: | |
| 1456 { | |
| 1457 // Stub calls, objects do not escape but they are not scale replaceable. | |
| 1458 // Adjust escape state for outgoing arguments. | |
| 1459 const TypeTuple * d = call->tf()->domain(); | |
| 1460 VectorSet ptset(Thread::current()->resource_area()); | |
| 1461 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
| 1462 const Type* at = d->field_at(i); | |
| 1463 Node *arg = call->in(i)->uncast(); | |
| 1464 const Type *aat = phase->type(arg); | |
| 1465 if (!arg->is_top() && at->isa_ptr() && aat->isa_ptr()) { | |
| 1466 assert(aat == Type::TOP || aat == TypePtr::NULL_PTR || | |
| 1467 aat->isa_ptr() != NULL, "expecting an Ptr"); | |
| 1468 set_escape_state(arg->_idx, PointsToNode::ArgEscape); | |
| 1469 if (arg->is_AddP()) { | |
| 1470 // | |
| 1471 // The inline_native_clone() case when the arraycopy stub is called | |
| 1472 // after the allocation before Initialize and CheckCastPP nodes. | |
| 1473 // | |
| 1474 // Set AddP's base (Allocate) as not scalar replaceable since | |
| 1475 // pointer to the base (with offset) is passed as argument. | |
| 1476 // | |
| 1477 arg = get_addp_base(arg); | |
| 1478 } | |
| 1479 ptset.Clear(); | |
| 1480 PointsTo(ptset, arg, phase); | |
| 1481 for( VectorSetI j(&ptset); j.test(); ++j ) { | |
| 1482 uint pt = j.elem; | |
| 1483 set_escape_state(pt, PointsToNode::ArgEscape); | |
| 1484 } | |
| 1485 } | |
| 1486 } | |
| 1487 break; | |
| 1488 } | |
| 0 | 1489 |
| 1490 case Op_CallStaticJava: | |
| 1491 // For a static call, we know exactly what method is being called. | |
| 1492 // Use bytecode estimator to record the call's escape affects | |
| 1493 { | |
| 1494 ciMethod *meth = call->as_CallJava()->method(); | |
| 65 | 1495 BCEscapeAnalyzer *call_analyzer = (meth !=NULL) ? meth->get_bcea() : NULL; |
| 1496 // fall-through if not a Java method or no analyzer information | |
| 1497 if (call_analyzer != NULL) { | |
| 0 | 1498 const TypeTuple * d = call->tf()->domain(); |
| 1499 VectorSet ptset(Thread::current()->resource_area()); | |
| 65 | 1500 bool copy_dependencies = false; |
| 0 | 1501 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
| 1502 const Type* at = d->field_at(i); | |
| 1503 int k = i - TypeFunc::Parms; | |
| 1504 | |
| 1505 if (at->isa_oopptr() != NULL) { | |
| 65 | 1506 Node *arg = call->in(i)->uncast(); |
| 0 | 1507 |
| 65 | 1508 bool global_escapes = false; |
| 1509 bool fields_escapes = false; | |
| 1510 if (!call_analyzer->is_arg_stack(k)) { | |
| 1511 // The argument global escapes, mark everything it could point to | |
| 1512 set_escape_state(arg->_idx, PointsToNode::GlobalEscape); | |
| 1513 global_escapes = true; | |
| 1514 } else { | |
| 1515 if (!call_analyzer->is_arg_local(k)) { | |
| 1516 // The argument itself doesn't escape, but any fields might | |
| 1517 fields_escapes = true; | |
| 0 | 1518 } |
| 65 | 1519 set_escape_state(arg->_idx, PointsToNode::ArgEscape); |
| 1520 copy_dependencies = true; | |
| 1521 } | |
| 1522 | |
| 1523 ptset.Clear(); | |
| 1524 PointsTo(ptset, arg, phase); | |
| 1525 for( VectorSetI j(&ptset); j.test(); ++j ) { | |
| 1526 uint pt = j.elem; | |
| 1527 if (global_escapes) { | |
| 1528 //The argument global escapes, mark everything it could point to | |
| 1529 set_escape_state(pt, PointsToNode::GlobalEscape); | |
| 1530 } else { | |
| 1531 if (fields_escapes) { | |
| 1532 // The argument itself doesn't escape, but any fields might | |
| 1533 add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); | |
| 1534 } | |
| 1535 set_escape_state(pt, PointsToNode::ArgEscape); | |
| 0 | 1536 } |
| 1537 } | |
| 1538 } | |
| 1539 } | |
| 65 | 1540 if (copy_dependencies) |
| 1541 call_analyzer->copy_dependencies(C()->dependencies()); | |
| 0 | 1542 break; |
| 1543 } | |
| 1544 } | |
| 1545 | |
| 1546 default: | |
| 65 | 1547 // Fall-through here if not a Java method or no analyzer information |
| 1548 // or some other type of call, assume the worst case: all arguments | |
| 0 | 1549 // globally escape. |
| 1550 { | |
| 1551 // adjust escape state for outgoing arguments | |
| 1552 const TypeTuple * d = call->tf()->domain(); | |
| 1553 VectorSet ptset(Thread::current()->resource_area()); | |
| 1554 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
| 1555 const Type* at = d->field_at(i); | |
| 1556 if (at->isa_oopptr() != NULL) { | |
| 65 | 1557 Node *arg = call->in(i)->uncast(); |
| 1558 set_escape_state(arg->_idx, PointsToNode::GlobalEscape); | |
| 0 | 1559 ptset.Clear(); |
| 1560 PointsTo(ptset, arg, phase); | |
| 1561 for( VectorSetI j(&ptset); j.test(); ++j ) { | |
| 1562 uint pt = j.elem; | |
| 1563 set_escape_state(pt, PointsToNode::GlobalEscape); | |
| 65 | 1564 PointsToNode *ptadr = ptnode_adr(pt); |
| 0 | 1565 } |
| 1566 } | |
| 1567 } | |
| 1568 } | |
| 1569 } | |
| 1570 } | |
| 1571 void ConnectionGraph::process_call_result(ProjNode *resproj, PhaseTransform *phase) { | |
| 1572 PointsToNode *ptadr = ptnode_adr(resproj->_idx); | |
| 1573 | |
| 65 | 1574 CallNode *call = resproj->in(0)->as_Call(); |
| 0 | 1575 switch (call->Opcode()) { |
| 1576 case Op_Allocate: | |
| 1577 { | |
| 1578 Node *k = call->in(AllocateNode::KlassNode); | |
| 1579 const TypeKlassPtr *kt; | |
| 1580 if (k->Opcode() == Op_LoadKlass) { | |
| 1581 kt = k->as_Load()->type()->isa_klassptr(); | |
| 1582 } else { | |
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1583 // Also works for DecodeN(LoadNKlass). |
| 0 | 1584 kt = k->as_Type()->type()->isa_klassptr(); |
| 1585 } | |
| 1586 assert(kt != NULL, "TypeKlassPtr required."); | |
| 1587 ciKlass* cik = kt->klass(); | |
| 1588 ciInstanceKlass* ciik = cik->as_instance_klass(); | |
| 1589 | |
| 1590 PointsToNode *ptadr = ptnode_adr(call->_idx); | |
| 65 | 1591 PointsToNode::EscapeState es; |
| 1592 uint edge_to; | |
| 0 | 1593 if (cik->is_subclass_of(_compile->env()->Thread_klass()) || ciik->has_finalizer()) { |
| 65 | 1594 es = PointsToNode::GlobalEscape; |
| 1595 edge_to = _phantom_object; // Could not be worse | |
| 0 | 1596 } else { |
| 65 | 1597 es = PointsToNode::NoEscape; |
| 1598 edge_to = call->_idx; | |
| 0 | 1599 } |
| 65 | 1600 set_escape_state(call->_idx, es); |
| 1601 add_pointsto_edge(resproj->_idx, edge_to); | |
| 1602 _processed.set(resproj->_idx); | |
| 0 | 1603 break; |
| 1604 } | |
| 1605 | |
| 1606 case Op_AllocateArray: | |
| 1607 { | |
| 1608 PointsToNode *ptadr = ptnode_adr(call->_idx); | |
| 65 | 1609 int length = call->in(AllocateNode::ALength)->find_int_con(-1); |
| 1610 if (length < 0 || length > EliminateAllocationArraySizeLimit) { | |
| 1611 // Not scalar replaceable if the length is not constant or too big. | |
| 1612 ptadr->_scalar_replaceable = false; | |
| 1613 } | |
| 0 | 1614 set_escape_state(call->_idx, PointsToNode::NoEscape); |
| 1615 add_pointsto_edge(resproj->_idx, call->_idx); | |
| 65 | 1616 _processed.set(resproj->_idx); |
| 0 | 1617 break; |
| 1618 } | |
| 1619 | |
| 1620 case Op_CallStaticJava: | |
| 1621 // For a static call, we know exactly what method is being called. | |
| 1622 // Use bytecode estimator to record whether the call's return value escapes | |
| 1623 { | |
| 65 | 1624 bool done = true; |
| 0 | 1625 const TypeTuple *r = call->tf()->range(); |
| 1626 const Type* ret_type = NULL; | |
| 1627 | |
| 1628 if (r->cnt() > TypeFunc::Parms) | |
| 1629 ret_type = r->field_at(TypeFunc::Parms); | |
| 1630 | |
| 1631 // Note: we use isa_ptr() instead of isa_oopptr() here because the | |
| 1632 // _multianewarray functions return a TypeRawPtr. | |
| 65 | 1633 if (ret_type == NULL || ret_type->isa_ptr() == NULL) { |
| 1634 _processed.set(resproj->_idx); | |
| 0 | 1635 break; // doesn't return a pointer type |
| 65 | 1636 } |
| 0 | 1637 ciMethod *meth = call->as_CallJava()->method(); |
| 65 | 1638 const TypeTuple * d = call->tf()->domain(); |
| 0 | 1639 if (meth == NULL) { |
| 1640 // not a Java method, assume global escape | |
| 1641 set_escape_state(call->_idx, PointsToNode::GlobalEscape); | |
| 1642 if (resproj != NULL) | |
| 1643 add_pointsto_edge(resproj->_idx, _phantom_object); | |
| 1644 } else { | |
| 65 | 1645 BCEscapeAnalyzer *call_analyzer = meth->get_bcea(); |
| 0 | 1646 VectorSet ptset(Thread::current()->resource_area()); |
| 65 | 1647 bool copy_dependencies = false; |
| 0 | 1648 |
| 65 | 1649 if (call_analyzer->is_return_allocated()) { |
| 1650 // Returns a newly allocated unescaped object, simply | |
| 1651 // update dependency information. | |
| 1652 // Mark it as NoEscape so that objects referenced by | |
| 1653 // it's fields will be marked as NoEscape at least. | |
| 1654 set_escape_state(call->_idx, PointsToNode::NoEscape); | |
| 1655 if (resproj != NULL) | |
| 1656 add_pointsto_edge(resproj->_idx, call->_idx); | |
| 1657 copy_dependencies = true; | |
| 1658 } else if (call_analyzer->is_return_local() && resproj != NULL) { | |
| 0 | 1659 // determine whether any arguments are returned |
| 1660 set_escape_state(call->_idx, PointsToNode::NoEscape); | |
| 1661 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
| 1662 const Type* at = d->field_at(i); | |
| 1663 | |
| 1664 if (at->isa_oopptr() != NULL) { | |
| 65 | 1665 Node *arg = call->in(i)->uncast(); |
| 0 | 1666 |
| 65 | 1667 if (call_analyzer->is_arg_returned(i - TypeFunc::Parms)) { |
| 0 | 1668 PointsToNode *arg_esp = _nodes->adr_at(arg->_idx); |
| 65 | 1669 if (arg_esp->node_type() == PointsToNode::UnknownType) |
| 1670 done = false; | |
| 1671 else if (arg_esp->node_type() == PointsToNode::JavaObject) | |
| 0 | 1672 add_pointsto_edge(resproj->_idx, arg->_idx); |
| 1673 else | |
| 1674 add_deferred_edge(resproj->_idx, arg->_idx); | |
| 1675 arg_esp->_hidden_alias = true; | |
| 1676 } | |
| 1677 } | |
| 1678 } | |
| 65 | 1679 copy_dependencies = true; |
| 0 | 1680 } else { |
| 1681 set_escape_state(call->_idx, PointsToNode::GlobalEscape); | |
| 1682 if (resproj != NULL) | |
| 1683 add_pointsto_edge(resproj->_idx, _phantom_object); | |
| 65 | 1684 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
| 1685 const Type* at = d->field_at(i); | |
| 1686 if (at->isa_oopptr() != NULL) { | |
| 1687 Node *arg = call->in(i)->uncast(); | |
| 1688 PointsToNode *arg_esp = _nodes->adr_at(arg->_idx); | |
| 1689 arg_esp->_hidden_alias = true; | |
| 1690 } | |
| 1691 } | |
| 0 | 1692 } |
| 65 | 1693 if (copy_dependencies) |
| 1694 call_analyzer->copy_dependencies(C()->dependencies()); | |
| 0 | 1695 } |
| 65 | 1696 if (done) |
| 1697 _processed.set(resproj->_idx); | |
| 0 | 1698 break; |
| 1699 } | |
| 1700 | |
| 1701 default: | |
| 1702 // Some other type of call, assume the worst case that the | |
| 1703 // returned value, if any, globally escapes. | |
| 1704 { | |
| 1705 const TypeTuple *r = call->tf()->range(); | |
| 1706 if (r->cnt() > TypeFunc::Parms) { | |
| 1707 const Type* ret_type = r->field_at(TypeFunc::Parms); | |
| 1708 | |
| 1709 // Note: we use isa_ptr() instead of isa_oopptr() here because the | |
| 1710 // _multianewarray functions return a TypeRawPtr. | |
| 1711 if (ret_type->isa_ptr() != NULL) { | |
| 1712 PointsToNode *ptadr = ptnode_adr(call->_idx); | |
| 1713 set_escape_state(call->_idx, PointsToNode::GlobalEscape); | |
| 1714 if (resproj != NULL) | |
| 1715 add_pointsto_edge(resproj->_idx, _phantom_object); | |
| 1716 } | |
| 1717 } | |
| 65 | 1718 _processed.set(resproj->_idx); |
| 0 | 1719 } |
| 1720 } | |
| 1721 } | |
| 1722 | |
| 65 | 1723 // Populate Connection Graph with Ideal nodes and create simple |
| 1724 // connection graph edges (do not need to check the node_type of inputs | |
| 1725 // or to call PointsTo() to walk the connection graph). | |
| 1726 void ConnectionGraph::record_for_escape_analysis(Node *n, PhaseTransform *phase) { | |
| 1727 if (_processed.test(n->_idx)) | |
| 1728 return; // No need to redefine node's state. | |
| 1729 | |
| 1730 if (n->is_Call()) { | |
| 1731 // Arguments to allocation and locking don't escape. | |
| 1732 if (n->is_Allocate()) { | |
| 1733 add_node(n, PointsToNode::JavaObject, PointsToNode::UnknownEscape, true); | |
| 1734 record_for_optimizer(n); | |
| 1735 } else if (n->is_Lock() || n->is_Unlock()) { | |
| 1736 // Put Lock and Unlock nodes on IGVN worklist to process them during | |
| 1737 // the first IGVN optimization when escape information is still available. | |
| 1738 record_for_optimizer(n); | |
| 1739 _processed.set(n->_idx); | |
| 1740 } else { | |
| 1741 // Have to process call's arguments first. | |
| 1742 PointsToNode::NodeType nt = PointsToNode::UnknownType; | |
| 1743 | |
| 1744 // Check if a call returns an object. | |
| 1745 const TypeTuple *r = n->as_Call()->tf()->range(); | |
| 1746 if (r->cnt() > TypeFunc::Parms && | |
| 1747 n->as_Call()->proj_out(TypeFunc::Parms) != NULL) { | |
| 1748 // Note: use isa_ptr() instead of isa_oopptr() here because | |
| 1749 // the _multianewarray functions return a TypeRawPtr. | |
| 1750 if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) { | |
| 1751 nt = PointsToNode::JavaObject; | |
| 1752 } | |
| 1753 } | |
| 1754 add_node(n, nt, PointsToNode::UnknownEscape, false); | |
| 1755 } | |
| 1756 return; | |
| 1757 } | |
| 1758 | |
| 1759 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because | |
| 1760 // ThreadLocal has RawPrt type. | |
| 1761 switch (n->Opcode()) { | |
| 1762 case Op_AddP: | |
| 1763 { | |
| 1764 add_node(n, PointsToNode::Field, PointsToNode::UnknownEscape, false); | |
| 1765 break; | |
| 1766 } | |
| 1767 case Op_CastX2P: | |
| 1768 { // "Unsafe" memory access. | |
| 1769 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
| 1770 break; | |
| 1771 } | |
| 1772 case Op_CastPP: | |
| 1773 case Op_CheckCastPP: | |
|
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1774 case Op_EncodeP: |
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1775 case Op_DecodeN: |
| 65 | 1776 { |
| 1777 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
| 1778 int ti = n->in(1)->_idx; | |
| 1779 PointsToNode::NodeType nt = _nodes->adr_at(ti)->node_type(); | |
| 1780 if (nt == PointsToNode::UnknownType) { | |
| 1781 _delayed_worklist.push(n); // Process it later. | |
| 1782 break; | |
| 1783 } else if (nt == PointsToNode::JavaObject) { | |
| 1784 add_pointsto_edge(n->_idx, ti); | |
| 1785 } else { | |
| 1786 add_deferred_edge(n->_idx, ti); | |
| 1787 } | |
| 1788 _processed.set(n->_idx); | |
| 1789 break; | |
| 1790 } | |
| 1791 case Op_ConP: | |
| 1792 { | |
| 1793 // assume all pointer constants globally escape except for null | |
| 1794 PointsToNode::EscapeState es; | |
| 1795 if (phase->type(n) == TypePtr::NULL_PTR) | |
| 1796 es = PointsToNode::NoEscape; | |
| 1797 else | |
| 1798 es = PointsToNode::GlobalEscape; | |
| 0 | 1799 |
| 65 | 1800 add_node(n, PointsToNode::JavaObject, es, true); |
| 1801 break; | |
| 1802 } | |
|
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1803 case Op_ConN: |
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1804 { |
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1805 // assume all narrow oop constants globally escape except for null |
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1806 PointsToNode::EscapeState es; |
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1807 if (phase->type(n) == TypeNarrowOop::NULL_PTR) |
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1808 es = PointsToNode::NoEscape; |
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1809 else |
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1810 es = PointsToNode::GlobalEscape; |
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1811 |
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1812 add_node(n, PointsToNode::JavaObject, es, true); |
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1813 break; |
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1814 } |
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1815 case Op_CreateEx: |
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1816 { |
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1817 // assume that all exception objects globally escape |
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1818 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); |
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1819 break; |
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1820 } |
| 65 | 1821 case Op_LoadKlass: |
|
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1822 case Op_LoadNKlass: |
| 65 | 1823 { |
| 1824 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
| 1825 break; | |
| 1826 } | |
| 1827 case Op_LoadP: | |
|
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1828 case Op_LoadN: |
| 65 | 1829 { |
| 1830 const Type *t = phase->type(n); | |
|
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1831 if (!t->isa_narrowoop() && t->isa_ptr() == NULL) { |
| 65 | 1832 _processed.set(n->_idx); |
| 1833 return; | |
| 1834 } | |
| 1835 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
| 1836 break; | |
| 1837 } | |
| 1838 case Op_Parm: | |
| 1839 { | |
| 1840 _processed.set(n->_idx); // No need to redefine it state. | |
| 1841 uint con = n->as_Proj()->_con; | |
| 1842 if (con < TypeFunc::Parms) | |
| 1843 return; | |
| 1844 const Type *t = n->in(0)->as_Start()->_domain->field_at(con); | |
| 1845 if (t->isa_ptr() == NULL) | |
| 1846 return; | |
| 1847 // We have to assume all input parameters globally escape | |
| 1848 // (Note: passing 'false' since _processed is already set). | |
| 1849 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, false); | |
| 1850 break; | |
| 1851 } | |
| 1852 case Op_Phi: | |
| 1853 { | |
| 1854 if (n->as_Phi()->type()->isa_ptr() == NULL) { | |
| 1855 // nothing to do if not an oop | |
| 1856 _processed.set(n->_idx); | |
| 1857 return; | |
| 1858 } | |
| 1859 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
| 1860 uint i; | |
| 1861 for (i = 1; i < n->req() ; i++) { | |
| 1862 Node* in = n->in(i); | |
| 1863 if (in == NULL) | |
| 1864 continue; // ignore NULL | |
| 1865 in = in->uncast(); | |
| 1866 if (in->is_top() || in == n) | |
| 1867 continue; // ignore top or inputs which go back this node | |
| 1868 int ti = in->_idx; | |
| 1869 PointsToNode::NodeType nt = _nodes->adr_at(ti)->node_type(); | |
| 1870 if (nt == PointsToNode::UnknownType) { | |
| 1871 break; | |
| 1872 } else if (nt == PointsToNode::JavaObject) { | |
| 1873 add_pointsto_edge(n->_idx, ti); | |
| 1874 } else { | |
| 1875 add_deferred_edge(n->_idx, ti); | |
| 1876 } | |
| 1877 } | |
| 1878 if (i >= n->req()) | |
| 1879 _processed.set(n->_idx); | |
| 1880 else | |
| 1881 _delayed_worklist.push(n); | |
| 1882 break; | |
| 1883 } | |
| 1884 case Op_Proj: | |
| 1885 { | |
| 1886 // we are only interested in the result projection from a call | |
| 1887 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { | |
| 1888 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
| 1889 process_call_result(n->as_Proj(), phase); | |
| 1890 if (!_processed.test(n->_idx)) { | |
| 1891 // The call's result may need to be processed later if the call | |
| 1892 // returns it's argument and the argument is not processed yet. | |
| 1893 _delayed_worklist.push(n); | |
| 1894 } | |
| 1895 } else { | |
| 1896 _processed.set(n->_idx); | |
| 1897 } | |
| 1898 break; | |
| 1899 } | |
| 1900 case Op_Return: | |
| 1901 { | |
| 1902 if( n->req() > TypeFunc::Parms && | |
| 1903 phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { | |
| 1904 // Treat Return value as LocalVar with GlobalEscape escape state. | |
| 1905 add_node(n, PointsToNode::LocalVar, PointsToNode::GlobalEscape, false); | |
| 1906 int ti = n->in(TypeFunc::Parms)->_idx; | |
| 1907 PointsToNode::NodeType nt = _nodes->adr_at(ti)->node_type(); | |
| 1908 if (nt == PointsToNode::UnknownType) { | |
| 1909 _delayed_worklist.push(n); // Process it later. | |
| 1910 break; | |
| 1911 } else if (nt == PointsToNode::JavaObject) { | |
| 1912 add_pointsto_edge(n->_idx, ti); | |
| 1913 } else { | |
| 1914 add_deferred_edge(n->_idx, ti); | |
| 1915 } | |
| 1916 } | |
| 1917 _processed.set(n->_idx); | |
| 1918 break; | |
| 1919 } | |
| 1920 case Op_StoreP: | |
|
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1921 case Op_StoreN: |
| 65 | 1922 { |
| 1923 const Type *adr_type = phase->type(n->in(MemNode::Address)); | |
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1924 if (adr_type->isa_narrowoop()) { |
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1925 adr_type = adr_type->is_narrowoop()->make_oopptr(); |
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1926 } |
| 65 | 1927 if (adr_type->isa_oopptr()) { |
| 1928 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
| 1929 } else { | |
| 1930 Node* adr = n->in(MemNode::Address); | |
| 1931 if (adr->is_AddP() && phase->type(adr) == TypeRawPtr::NOTNULL && | |
| 1932 adr->in(AddPNode::Address)->is_Proj() && | |
| 1933 adr->in(AddPNode::Address)->in(0)->is_Allocate()) { | |
| 1934 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
| 1935 // We are computing a raw address for a store captured | |
| 1936 // by an Initialize compute an appropriate address type. | |
| 1937 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); | |
| 1938 assert(offs != Type::OffsetBot, "offset must be a constant"); | |
| 1939 } else { | |
| 1940 _processed.set(n->_idx); | |
| 1941 return; | |
| 1942 } | |
| 1943 } | |
| 1944 break; | |
| 1945 } | |
| 1946 case Op_StorePConditional: | |
| 1947 case Op_CompareAndSwapP: | |
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1948 case Op_CompareAndSwapN: |
| 65 | 1949 { |
| 1950 const Type *adr_type = phase->type(n->in(MemNode::Address)); | |
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1951 if (adr_type->isa_narrowoop()) { |
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1952 adr_type = adr_type->is_narrowoop()->make_oopptr(); |
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1953 } |
| 65 | 1954 if (adr_type->isa_oopptr()) { |
| 1955 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
| 1956 } else { | |
| 1957 _processed.set(n->_idx); | |
| 1958 return; | |
| 1959 } | |
| 1960 break; | |
| 1961 } | |
| 1962 case Op_ThreadLocal: | |
| 1963 { | |
| 1964 add_node(n, PointsToNode::JavaObject, PointsToNode::ArgEscape, true); | |
| 1965 break; | |
| 1966 } | |
| 1967 default: | |
| 1968 ; | |
| 1969 // nothing to do | |
| 1970 } | |
| 1971 return; | |
| 1972 } | |
| 1973 | |
| 1974 void ConnectionGraph::build_connection_graph(Node *n, PhaseTransform *phase) { | |
| 1975 // Don't set processed bit for AddP, LoadP, StoreP since | |
| 1976 // they may need more then one pass to process. | |
| 1977 if (_processed.test(n->_idx)) | |
| 1978 return; // No need to redefine node's state. | |
| 1979 | |
| 0 | 1980 PointsToNode *ptadr = ptnode_adr(n->_idx); |
| 1981 | |
| 1982 if (n->is_Call()) { | |
| 1983 CallNode *call = n->as_Call(); | |
| 1984 process_call_arguments(call, phase); | |
| 65 | 1985 _processed.set(n->_idx); |
| 0 | 1986 return; |
| 1987 } | |
| 1988 | |
| 65 | 1989 switch (n->Opcode()) { |
| 0 | 1990 case Op_AddP: |
| 1991 { | |
| 65 | 1992 Node *base = get_addp_base(n); |
| 1993 // Create a field edge to this node from everything base could point to. | |
| 0 | 1994 VectorSet ptset(Thread::current()->resource_area()); |
| 1995 PointsTo(ptset, base, phase); | |
| 1996 for( VectorSetI i(&ptset); i.test(); ++i ) { | |
| 1997 uint pt = i.elem; | |
| 65 | 1998 add_field_edge(pt, n->_idx, address_offset(n, phase)); |
| 1999 } | |
| 2000 break; | |
| 2001 } | |
| 2002 case Op_CastX2P: | |
| 2003 { | |
| 2004 assert(false, "Op_CastX2P"); | |
| 2005 break; | |
| 2006 } | |
| 2007 case Op_CastPP: | |
| 2008 case Op_CheckCastPP: | |
|
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2009 case Op_EncodeP: |
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2010 case Op_DecodeN: |
| 65 | 2011 { |
| 2012 int ti = n->in(1)->_idx; | |
| 2013 if (_nodes->adr_at(ti)->node_type() == PointsToNode::JavaObject) { | |
| 2014 add_pointsto_edge(n->_idx, ti); | |
| 2015 } else { | |
| 2016 add_deferred_edge(n->_idx, ti); | |
| 2017 } | |
| 2018 _processed.set(n->_idx); | |
| 2019 break; | |
| 2020 } | |
| 2021 case Op_ConP: | |
| 2022 { | |
| 2023 assert(false, "Op_ConP"); | |
| 2024 break; | |
| 2025 } | |
| 163 | 2026 case Op_ConN: |
| 2027 { | |
| 2028 assert(false, "Op_ConN"); | |
| 2029 break; | |
| 2030 } | |
| 65 | 2031 case Op_CreateEx: |
| 2032 { | |
| 2033 assert(false, "Op_CreateEx"); | |
| 2034 break; | |
| 2035 } | |
| 2036 case Op_LoadKlass: | |
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2037 case Op_LoadNKlass: |
| 65 | 2038 { |
| 2039 assert(false, "Op_LoadKlass"); | |
| 2040 break; | |
| 2041 } | |
| 2042 case Op_LoadP: | |
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2043 case Op_LoadN: |
| 65 | 2044 { |
| 2045 const Type *t = phase->type(n); | |
| 2046 #ifdef ASSERT | |
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2047 if (!t->isa_narrowoop() && t->isa_ptr() == NULL) |
| 65 | 2048 assert(false, "Op_LoadP"); |
| 2049 #endif | |
| 2050 | |
| 2051 Node* adr = n->in(MemNode::Address)->uncast(); | |
| 2052 const Type *adr_type = phase->type(adr); | |
| 2053 Node* adr_base; | |
| 2054 if (adr->is_AddP()) { | |
| 2055 adr_base = get_addp_base(adr); | |
| 2056 } else { | |
| 2057 adr_base = adr; | |
| 2058 } | |
| 2059 | |
| 2060 // For everything "adr_base" could point to, create a deferred edge from | |
| 2061 // this node to each field with the same offset. | |
| 2062 VectorSet ptset(Thread::current()->resource_area()); | |
| 2063 PointsTo(ptset, adr_base, phase); | |
| 2064 int offset = address_offset(adr, phase); | |
| 2065 for( VectorSetI i(&ptset); i.test(); ++i ) { | |
| 2066 uint pt = i.elem; | |
| 2067 add_deferred_edge_to_fields(n->_idx, pt, offset); | |
| 0 | 2068 } |
| 2069 break; | |
| 2070 } | |
| 2071 case Op_Parm: | |
| 2072 { | |
| 65 | 2073 assert(false, "Op_Parm"); |
| 0 | 2074 break; |
| 2075 } | |
| 2076 case Op_Phi: | |
| 2077 { | |
| 65 | 2078 #ifdef ASSERT |
| 2079 if (n->as_Phi()->type()->isa_ptr() == NULL) | |
| 2080 assert(false, "Op_Phi"); | |
| 2081 #endif | |
| 2082 for (uint i = 1; i < n->req() ; i++) { | |
| 2083 Node* in = n->in(i); | |
| 2084 if (in == NULL) | |
| 2085 continue; // ignore NULL | |
| 2086 in = in->uncast(); | |
| 2087 if (in->is_top() || in == n) | |
| 2088 continue; // ignore top or inputs which go back this node | |
| 2089 int ti = in->_idx; | |
| 2090 if (_nodes->adr_at(in->_idx)->node_type() == PointsToNode::JavaObject) { | |
| 2091 add_pointsto_edge(n->_idx, ti); | |
| 2092 } else { | |
| 2093 add_deferred_edge(n->_idx, ti); | |
| 2094 } | |
| 2095 } | |
| 0 | 2096 _processed.set(n->_idx); |
| 2097 break; | |
| 2098 } | |
| 65 | 2099 case Op_Proj: |
| 0 | 2100 { |
| 65 | 2101 // we are only interested in the result projection from a call |
| 2102 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { | |
| 2103 process_call_result(n->as_Proj(), phase); | |
| 2104 assert(_processed.test(n->_idx), "all call results should be processed"); | |
| 2105 } else { | |
| 2106 assert(false, "Op_Proj"); | |
| 2107 } | |
| 0 | 2108 break; |
| 2109 } | |
| 65 | 2110 case Op_Return: |
| 0 | 2111 { |
| 65 | 2112 #ifdef ASSERT |
| 2113 if( n->req() <= TypeFunc::Parms || | |
| 2114 !phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { | |
| 2115 assert(false, "Op_Return"); | |
| 0 | 2116 } |
| 65 | 2117 #endif |
| 2118 int ti = n->in(TypeFunc::Parms)->_idx; | |
| 2119 if (_nodes->adr_at(ti)->node_type() == PointsToNode::JavaObject) { | |
| 2120 add_pointsto_edge(n->_idx, ti); | |
| 2121 } else { | |
| 2122 add_deferred_edge(n->_idx, ti); | |
| 2123 } | |
| 2124 _processed.set(n->_idx); | |
| 0 | 2125 break; |
| 2126 } | |
| 2127 case Op_StoreP: | |
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2128 case Op_StoreN: |
| 0 | 2129 case Op_StorePConditional: |
| 2130 case Op_CompareAndSwapP: | |
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2131 case Op_CompareAndSwapN: |
| 0 | 2132 { |
| 2133 Node *adr = n->in(MemNode::Address); | |
| 2134 const Type *adr_type = phase->type(adr); | |
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2135 if (adr_type->isa_narrowoop()) { |
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2136 adr_type = adr_type->is_narrowoop()->make_oopptr(); |
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2137 } |
| 65 | 2138 #ifdef ASSERT |
| 0 | 2139 if (!adr_type->isa_oopptr()) |
| 65 | 2140 assert(phase->type(adr) == TypeRawPtr::NOTNULL, "Op_StoreP"); |
| 2141 #endif | |
| 0 | 2142 |
| 65 | 2143 assert(adr->is_AddP(), "expecting an AddP"); |
| 2144 Node *adr_base = get_addp_base(adr); | |
| 2145 Node *val = n->in(MemNode::ValueIn)->uncast(); | |
| 2146 // For everything "adr_base" could point to, create a deferred edge | |
| 2147 // to "val" from each field with the same offset. | |
| 0 | 2148 VectorSet ptset(Thread::current()->resource_area()); |
| 2149 PointsTo(ptset, adr_base, phase); | |
| 2150 for( VectorSetI i(&ptset); i.test(); ++i ) { | |
| 2151 uint pt = i.elem; | |
| 65 | 2152 add_edge_from_fields(pt, val->_idx, address_offset(adr, phase)); |
| 0 | 2153 } |
| 2154 break; | |
| 2155 } | |
| 65 | 2156 case Op_ThreadLocal: |
| 0 | 2157 { |
| 65 | 2158 assert(false, "Op_ThreadLocal"); |
| 0 | 2159 break; |
| 2160 } | |
| 2161 default: | |
| 2162 ; | |
| 2163 // nothing to do | |
| 2164 } | |
| 2165 } | |
| 2166 | |
| 2167 #ifndef PRODUCT | |
| 2168 void ConnectionGraph::dump() { | |
| 2169 PhaseGVN *igvn = _compile->initial_gvn(); | |
| 2170 bool first = true; | |
| 2171 | |
| 65 | 2172 uint size = (uint)_nodes->length(); |
| 2173 for (uint ni = 0; ni < size; ni++) { | |
| 2174 PointsToNode *ptn = _nodes->adr_at(ni); | |
| 2175 PointsToNode::NodeType ptn_type = ptn->node_type(); | |
| 2176 | |
| 2177 if (ptn_type != PointsToNode::JavaObject || ptn->_node == NULL) | |
| 0 | 2178 continue; |
| 65 | 2179 PointsToNode::EscapeState es = escape_state(ptn->_node, igvn); |
| 2180 if (ptn->_node->is_Allocate() && (es == PointsToNode::NoEscape || Verbose)) { | |
| 2181 if (first) { | |
| 2182 tty->cr(); | |
| 2183 tty->print("======== Connection graph for "); | |
| 2184 C()->method()->print_short_name(); | |
| 2185 tty->cr(); | |
| 2186 first = false; | |
| 2187 } | |
| 2188 tty->print("%6d ", ni); | |
| 2189 ptn->dump(); | |
| 2190 // Print all locals which reference this allocation | |
| 2191 for (uint li = ni; li < size; li++) { | |
| 2192 PointsToNode *ptn_loc = _nodes->adr_at(li); | |
| 2193 PointsToNode::NodeType ptn_loc_type = ptn_loc->node_type(); | |
| 2194 if ( ptn_loc_type == PointsToNode::LocalVar && ptn_loc->_node != NULL && | |
| 2195 ptn_loc->edge_count() == 1 && ptn_loc->edge_target(0) == ni ) { | |
| 2196 tty->print("%6d LocalVar [[%d]]", li, ni); | |
| 2197 _nodes->adr_at(li)->_node->dump(); | |
| 0 | 2198 } |
| 2199 } | |
| 65 | 2200 if (Verbose) { |
| 2201 // Print all fields which reference this allocation | |
| 2202 for (uint i = 0; i < ptn->edge_count(); i++) { | |
| 2203 uint ei = ptn->edge_target(i); | |
| 2204 tty->print("%6d Field [[%d]]", ei, ni); | |
| 2205 _nodes->adr_at(ei)->_node->dump(); | |
| 2206 } | |
| 2207 } | |
| 2208 tty->cr(); | |
| 0 | 2209 } |
| 2210 } | |
| 2211 } | |
| 2212 #endif |