Tue, 20 Dec 2011 16:56:50 +0100
7121140: Allocation paths require explicit memory synchronization operations for RMO systems
Summary: adds store store barrier after initialization of header and body of objects.
Reviewed-by: never, kvn
duke@435 | 1 | /* |
kvn@2556 | 2 | * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "ci/bcEscapeAnalyzer.hpp" |
stefank@2314 | 27 | #include "libadt/vectset.hpp" |
stefank@2314 | 28 | #include "memory/allocation.hpp" |
stefank@2314 | 29 | #include "opto/c2compiler.hpp" |
stefank@2314 | 30 | #include "opto/callnode.hpp" |
stefank@2314 | 31 | #include "opto/cfgnode.hpp" |
stefank@2314 | 32 | #include "opto/compile.hpp" |
stefank@2314 | 33 | #include "opto/escape.hpp" |
stefank@2314 | 34 | #include "opto/phaseX.hpp" |
stefank@2314 | 35 | #include "opto/rootnode.hpp" |
duke@435 | 36 | |
duke@435 | 37 | void PointsToNode::add_edge(uint targIdx, PointsToNode::EdgeType et) { |
duke@435 | 38 | uint v = (targIdx << EdgeShift) + ((uint) et); |
duke@435 | 39 | if (_edges == NULL) { |
duke@435 | 40 | Arena *a = Compile::current()->comp_arena(); |
duke@435 | 41 | _edges = new(a) GrowableArray<uint>(a, INITIAL_EDGE_COUNT, 0, 0); |
duke@435 | 42 | } |
duke@435 | 43 | _edges->append_if_missing(v); |
duke@435 | 44 | } |
duke@435 | 45 | |
duke@435 | 46 | void PointsToNode::remove_edge(uint targIdx, PointsToNode::EdgeType et) { |
duke@435 | 47 | uint v = (targIdx << EdgeShift) + ((uint) et); |
duke@435 | 48 | |
duke@435 | 49 | _edges->remove(v); |
duke@435 | 50 | } |
duke@435 | 51 | |
duke@435 | 52 | #ifndef PRODUCT |
kvn@512 | 53 | static const char *node_type_names[] = { |
duke@435 | 54 | "UnknownType", |
duke@435 | 55 | "JavaObject", |
duke@435 | 56 | "LocalVar", |
duke@435 | 57 | "Field" |
duke@435 | 58 | }; |
duke@435 | 59 | |
kvn@512 | 60 | static const char *esc_names[] = { |
duke@435 | 61 | "UnknownEscape", |
kvn@500 | 62 | "NoEscape", |
kvn@500 | 63 | "ArgEscape", |
kvn@500 | 64 | "GlobalEscape" |
duke@435 | 65 | }; |
duke@435 | 66 | |
kvn@512 | 67 | static const char *edge_type_suffix[] = { |
duke@435 | 68 | "?", // UnknownEdge |
duke@435 | 69 | "P", // PointsToEdge |
duke@435 | 70 | "D", // DeferredEdge |
duke@435 | 71 | "F" // FieldEdge |
duke@435 | 72 | }; |
duke@435 | 73 | |
kvn@688 | 74 | void PointsToNode::dump(bool print_state) const { |
duke@435 | 75 | NodeType nt = node_type(); |
kvn@688 | 76 | tty->print("%s ", node_type_names[(int) nt]); |
kvn@688 | 77 | if (print_state) { |
kvn@688 | 78 | EscapeState es = escape_state(); |
kvn@688 | 79 | tty->print("%s %s ", esc_names[(int) es], _scalar_replaceable ? "":"NSR"); |
kvn@688 | 80 | } |
kvn@688 | 81 | tty->print("[["); |
duke@435 | 82 | for (uint i = 0; i < edge_count(); i++) { |
duke@435 | 83 | tty->print(" %d%s", edge_target(i), edge_type_suffix[(int) edge_type(i)]); |
duke@435 | 84 | } |
duke@435 | 85 | tty->print("]] "); |
duke@435 | 86 | if (_node == NULL) |
duke@435 | 87 | tty->print_cr("<null>"); |
duke@435 | 88 | else |
duke@435 | 89 | _node->dump(); |
duke@435 | 90 | } |
duke@435 | 91 | #endif |
duke@435 | 92 | |
kvn@1989 | 93 | ConnectionGraph::ConnectionGraph(Compile * C, PhaseIterGVN *igvn) : |
kvn@679 | 94 | _nodes(C->comp_arena(), C->unique(), C->unique(), PointsToNode()), |
kvn@679 | 95 | _processed(C->comp_arena()), |
kvn@2556 | 96 | pt_ptset(C->comp_arena()), |
kvn@2556 | 97 | pt_visited(C->comp_arena()), |
kvn@2556 | 98 | pt_worklist(C->comp_arena(), 4, 0, 0), |
kvn@679 | 99 | _collecting(true), |
kvn@2276 | 100 | _progress(false), |
kvn@679 | 101 | _compile(C), |
kvn@1989 | 102 | _igvn(igvn), |
kvn@679 | 103 | _node_map(C->comp_arena()) { |
kvn@679 | 104 | |
kvn@688 | 105 | _phantom_object = C->top()->_idx, |
kvn@688 | 106 | add_node(C->top(), PointsToNode::JavaObject, PointsToNode::GlobalEscape,true); |
kvn@688 | 107 | |
kvn@688 | 108 | // Add ConP(#NULL) and ConN(#NULL) nodes. |
kvn@688 | 109 | Node* oop_null = igvn->zerocon(T_OBJECT); |
kvn@688 | 110 | _oop_null = oop_null->_idx; |
kvn@3242 | 111 | assert(_oop_null < nodes_size(), "should be created already"); |
kvn@688 | 112 | add_node(oop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true); |
kvn@688 | 113 | |
kvn@688 | 114 | if (UseCompressedOops) { |
kvn@688 | 115 | Node* noop_null = igvn->zerocon(T_NARROWOOP); |
kvn@688 | 116 | _noop_null = noop_null->_idx; |
kvn@3242 | 117 | assert(_noop_null < nodes_size(), "should be created already"); |
kvn@688 | 118 | add_node(noop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true); |
kvn@3242 | 119 | } else { |
kvn@3242 | 120 | _noop_null = _oop_null; // Should be initialized |
kvn@688 | 121 | } |
kvn@3309 | 122 | _pcmp_neq = NULL; // Should be initialized |
kvn@3309 | 123 | _pcmp_eq = NULL; |
duke@435 | 124 | } |
duke@435 | 125 | |
duke@435 | 126 | void ConnectionGraph::add_pointsto_edge(uint from_i, uint to_i) { |
duke@435 | 127 | PointsToNode *f = ptnode_adr(from_i); |
duke@435 | 128 | PointsToNode *t = ptnode_adr(to_i); |
duke@435 | 129 | |
duke@435 | 130 | assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); |
duke@435 | 131 | assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of PointsTo edge"); |
duke@435 | 132 | assert(t->node_type() == PointsToNode::JavaObject, "invalid destination of PointsTo edge"); |
kvn@3318 | 133 | if (to_i == _phantom_object) { // Quick test for most common object |
kvn@3318 | 134 | if (f->has_unknown_ptr()) { |
kvn@3318 | 135 | return; |
kvn@3318 | 136 | } else { |
kvn@3318 | 137 | f->set_has_unknown_ptr(); |
kvn@3318 | 138 | } |
kvn@3318 | 139 | } |
kvn@2276 | 140 | add_edge(f, to_i, PointsToNode::PointsToEdge); |
duke@435 | 141 | } |
duke@435 | 142 | |
duke@435 | 143 | void ConnectionGraph::add_deferred_edge(uint from_i, uint to_i) { |
duke@435 | 144 | PointsToNode *f = ptnode_adr(from_i); |
duke@435 | 145 | PointsToNode *t = ptnode_adr(to_i); |
duke@435 | 146 | |
duke@435 | 147 | assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); |
duke@435 | 148 | assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of Deferred edge"); |
duke@435 | 149 | assert(t->node_type() == PointsToNode::LocalVar || t->node_type() == PointsToNode::Field, "invalid destination of Deferred edge"); |
duke@435 | 150 | // don't add a self-referential edge, this can occur during removal of |
duke@435 | 151 | // deferred edges |
duke@435 | 152 | if (from_i != to_i) |
kvn@2276 | 153 | add_edge(f, to_i, PointsToNode::DeferredEdge); |
duke@435 | 154 | } |
duke@435 | 155 | |
kvn@500 | 156 | int ConnectionGraph::address_offset(Node* adr, PhaseTransform *phase) { |
kvn@500 | 157 | const Type *adr_type = phase->type(adr); |
kvn@500 | 158 | if (adr->is_AddP() && adr_type->isa_oopptr() == NULL && |
kvn@500 | 159 | adr->in(AddPNode::Address)->is_Proj() && |
kvn@500 | 160 | adr->in(AddPNode::Address)->in(0)->is_Allocate()) { |
kvn@500 | 161 | // We are computing a raw address for a store captured by an Initialize |
kvn@500 | 162 | // compute an appropriate address type. AddP cases #3 and #5 (see below). |
kvn@500 | 163 | int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); |
kvn@500 | 164 | assert(offs != Type::OffsetBot || |
kvn@500 | 165 | adr->in(AddPNode::Address)->in(0)->is_AllocateArray(), |
kvn@500 | 166 | "offset must be a constant or it is initialization of array"); |
kvn@500 | 167 | return offs; |
kvn@500 | 168 | } |
kvn@500 | 169 | const TypePtr *t_ptr = adr_type->isa_ptr(); |
duke@435 | 170 | assert(t_ptr != NULL, "must be a pointer type"); |
duke@435 | 171 | return t_ptr->offset(); |
duke@435 | 172 | } |
duke@435 | 173 | |
duke@435 | 174 | void ConnectionGraph::add_field_edge(uint from_i, uint to_i, int offset) { |
kvn@3318 | 175 | // Don't add fields to NULL pointer. |
kvn@3318 | 176 | if (is_null_ptr(from_i)) |
kvn@3318 | 177 | return; |
duke@435 | 178 | PointsToNode *f = ptnode_adr(from_i); |
duke@435 | 179 | PointsToNode *t = ptnode_adr(to_i); |
duke@435 | 180 | |
duke@435 | 181 | assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); |
duke@435 | 182 | assert(f->node_type() == PointsToNode::JavaObject, "invalid destination of Field edge"); |
duke@435 | 183 | assert(t->node_type() == PointsToNode::Field, "invalid destination of Field edge"); |
duke@435 | 184 | assert (t->offset() == -1 || t->offset() == offset, "conflicting field offsets"); |
duke@435 | 185 | t->set_offset(offset); |
duke@435 | 186 | |
kvn@2276 | 187 | add_edge(f, to_i, PointsToNode::FieldEdge); |
duke@435 | 188 | } |
duke@435 | 189 | |
duke@435 | 190 | void ConnectionGraph::set_escape_state(uint ni, PointsToNode::EscapeState es) { |
kvn@3242 | 191 | // Don't change non-escaping state of NULL pointer. |
kvn@3318 | 192 | if (is_null_ptr(ni)) |
kvn@3242 | 193 | return; |
duke@435 | 194 | PointsToNode *npt = ptnode_adr(ni); |
duke@435 | 195 | PointsToNode::EscapeState old_es = npt->escape_state(); |
duke@435 | 196 | if (es > old_es) |
duke@435 | 197 | npt->set_escape_state(es); |
duke@435 | 198 | } |
duke@435 | 199 | |
kvn@500 | 200 | void ConnectionGraph::add_node(Node *n, PointsToNode::NodeType nt, |
kvn@500 | 201 | PointsToNode::EscapeState es, bool done) { |
kvn@500 | 202 | PointsToNode* ptadr = ptnode_adr(n->_idx); |
kvn@500 | 203 | ptadr->_node = n; |
kvn@500 | 204 | ptadr->set_node_type(nt); |
kvn@500 | 205 | |
kvn@500 | 206 | // inline set_escape_state(idx, es); |
kvn@500 | 207 | PointsToNode::EscapeState old_es = ptadr->escape_state(); |
kvn@500 | 208 | if (es > old_es) |
kvn@500 | 209 | ptadr->set_escape_state(es); |
kvn@500 | 210 | |
kvn@500 | 211 | if (done) |
kvn@500 | 212 | _processed.set(n->_idx); |
kvn@500 | 213 | } |
kvn@500 | 214 | |
kvn@1989 | 215 | PointsToNode::EscapeState ConnectionGraph::escape_state(Node *n) { |
duke@435 | 216 | uint idx = n->_idx; |
duke@435 | 217 | PointsToNode::EscapeState es; |
duke@435 | 218 | |
kvn@500 | 219 | // If we are still collecting or there were no non-escaping allocations |
kvn@500 | 220 | // we don't know the answer yet |
kvn@679 | 221 | if (_collecting) |
duke@435 | 222 | return PointsToNode::UnknownEscape; |
duke@435 | 223 | |
duke@435 | 224 | // if the node was created after the escape computation, return |
duke@435 | 225 | // UnknownEscape |
kvn@679 | 226 | if (idx >= nodes_size()) |
duke@435 | 227 | return PointsToNode::UnknownEscape; |
duke@435 | 228 | |
kvn@679 | 229 | es = ptnode_adr(idx)->escape_state(); |
duke@435 | 230 | |
duke@435 | 231 | // if we have already computed a value, return it |
kvn@895 | 232 | if (es != PointsToNode::UnknownEscape && |
kvn@895 | 233 | ptnode_adr(idx)->node_type() == PointsToNode::JavaObject) |
duke@435 | 234 | return es; |
duke@435 | 235 | |
kvn@679 | 236 | // PointsTo() calls n->uncast() which can return a new ideal node. |
kvn@679 | 237 | if (n->uncast()->_idx >= nodes_size()) |
kvn@679 | 238 | return PointsToNode::UnknownEscape; |
kvn@679 | 239 | |
kvn@1989 | 240 | PointsToNode::EscapeState orig_es = es; |
kvn@1989 | 241 | |
duke@435 | 242 | // compute max escape state of anything this node could point to |
kvn@2556 | 243 | for(VectorSetI i(PointsTo(n)); i.test() && es != PointsToNode::GlobalEscape; ++i) { |
duke@435 | 244 | uint pt = i.elem; |
kvn@679 | 245 | PointsToNode::EscapeState pes = ptnode_adr(pt)->escape_state(); |
duke@435 | 246 | if (pes > es) |
duke@435 | 247 | es = pes; |
duke@435 | 248 | } |
kvn@1989 | 249 | if (orig_es != es) { |
kvn@1989 | 250 | // cache the computed escape state |
kvn@3242 | 251 | assert(es > orig_es, "should have computed an escape state"); |
kvn@3242 | 252 | set_escape_state(idx, es); |
kvn@1989 | 253 | } // orig_es could be PointsToNode::UnknownEscape |
duke@435 | 254 | return es; |
duke@435 | 255 | } |
duke@435 | 256 | |
kvn@2556 | 257 | VectorSet* ConnectionGraph::PointsTo(Node * n) { |
kvn@2556 | 258 | pt_ptset.Reset(); |
kvn@2556 | 259 | pt_visited.Reset(); |
kvn@2556 | 260 | pt_worklist.clear(); |
duke@435 | 261 | |
kvn@559 | 262 | #ifdef ASSERT |
kvn@559 | 263 | Node *orig_n = n; |
kvn@559 | 264 | #endif |
kvn@559 | 265 | |
kvn@500 | 266 | n = n->uncast(); |
kvn@679 | 267 | PointsToNode* npt = ptnode_adr(n->_idx); |
duke@435 | 268 | |
duke@435 | 269 | // If we have a JavaObject, return just that object |
kvn@679 | 270 | if (npt->node_type() == PointsToNode::JavaObject) { |
kvn@2556 | 271 | pt_ptset.set(n->_idx); |
kvn@2556 | 272 | return &pt_ptset; |
duke@435 | 273 | } |
kvn@559 | 274 | #ifdef ASSERT |
kvn@679 | 275 | if (npt->_node == NULL) { |
kvn@559 | 276 | if (orig_n != n) |
kvn@559 | 277 | orig_n->dump(); |
kvn@559 | 278 | n->dump(); |
kvn@679 | 279 | assert(npt->_node != NULL, "unregistered node"); |
kvn@559 | 280 | } |
kvn@559 | 281 | #endif |
kvn@2556 | 282 | pt_worklist.push(n->_idx); |
kvn@2556 | 283 | while(pt_worklist.length() > 0) { |
kvn@2556 | 284 | int ni = pt_worklist.pop(); |
kvn@2556 | 285 | if (pt_visited.test_set(ni)) |
kvn@679 | 286 | continue; |
duke@435 | 287 | |
kvn@679 | 288 | PointsToNode* pn = ptnode_adr(ni); |
kvn@679 | 289 | // ensure that all inputs of a Phi have been processed |
kvn@679 | 290 | assert(!_collecting || !pn->_node->is_Phi() || _processed.test(ni),""); |
kvn@679 | 291 | |
kvn@679 | 292 | int edges_processed = 0; |
kvn@679 | 293 | uint e_cnt = pn->edge_count(); |
kvn@679 | 294 | for (uint e = 0; e < e_cnt; e++) { |
kvn@679 | 295 | uint etgt = pn->edge_target(e); |
kvn@679 | 296 | PointsToNode::EdgeType et = pn->edge_type(e); |
kvn@679 | 297 | if (et == PointsToNode::PointsToEdge) { |
kvn@2556 | 298 | pt_ptset.set(etgt); |
kvn@679 | 299 | edges_processed++; |
kvn@679 | 300 | } else if (et == PointsToNode::DeferredEdge) { |
kvn@2556 | 301 | pt_worklist.push(etgt); |
kvn@679 | 302 | edges_processed++; |
kvn@679 | 303 | } else { |
kvn@679 | 304 | assert(false,"neither PointsToEdge or DeferredEdge"); |
duke@435 | 305 | } |
kvn@679 | 306 | } |
kvn@679 | 307 | if (edges_processed == 0) { |
kvn@679 | 308 | // no deferred or pointsto edges found. Assume the value was set |
kvn@679 | 309 | // outside this method. Add the phantom object to the pointsto set. |
kvn@2556 | 310 | pt_ptset.set(_phantom_object); |
duke@435 | 311 | } |
duke@435 | 312 | } |
kvn@2556 | 313 | return &pt_ptset; |
duke@435 | 314 | } |
duke@435 | 315 | |
kvn@536 | 316 | void ConnectionGraph::remove_deferred(uint ni, GrowableArray<uint>* deferred_edges, VectorSet* visited) { |
kvn@536 | 317 | // This method is most expensive during ConnectionGraph construction. |
kvn@536 | 318 | // Reuse vectorSet and an additional growable array for deferred edges. |
kvn@536 | 319 | deferred_edges->clear(); |
kvn@2556 | 320 | visited->Reset(); |
duke@435 | 321 | |
kvn@679 | 322 | visited->set(ni); |
duke@435 | 323 | PointsToNode *ptn = ptnode_adr(ni); |
kvn@3318 | 324 | assert(ptn->node_type() == PointsToNode::LocalVar || |
kvn@3318 | 325 | ptn->node_type() == PointsToNode::Field, "sanity"); |
kvn@3318 | 326 | assert(ptn->edge_count() != 0, "should have at least phantom_object"); |
duke@435 | 327 | |
kvn@536 | 328 | // Mark current edges as visited and move deferred edges to separate array. |
kvn@679 | 329 | for (uint i = 0; i < ptn->edge_count(); ) { |
kvn@500 | 330 | uint t = ptn->edge_target(i); |
kvn@536 | 331 | #ifdef ASSERT |
kvn@536 | 332 | assert(!visited->test_set(t), "expecting no duplications"); |
kvn@536 | 333 | #else |
kvn@536 | 334 | visited->set(t); |
kvn@536 | 335 | #endif |
kvn@536 | 336 | if (ptn->edge_type(i) == PointsToNode::DeferredEdge) { |
kvn@536 | 337 | ptn->remove_edge(t, PointsToNode::DeferredEdge); |
kvn@536 | 338 | deferred_edges->append(t); |
kvn@559 | 339 | } else { |
kvn@559 | 340 | i++; |
kvn@536 | 341 | } |
kvn@536 | 342 | } |
kvn@536 | 343 | for (int next = 0; next < deferred_edges->length(); ++next) { |
kvn@536 | 344 | uint t = deferred_edges->at(next); |
kvn@500 | 345 | PointsToNode *ptt = ptnode_adr(t); |
kvn@679 | 346 | uint e_cnt = ptt->edge_count(); |
kvn@3318 | 347 | assert(e_cnt != 0, "should have at least phantom_object"); |
kvn@679 | 348 | for (uint e = 0; e < e_cnt; e++) { |
kvn@679 | 349 | uint etgt = ptt->edge_target(e); |
kvn@679 | 350 | if (visited->test_set(etgt)) |
kvn@536 | 351 | continue; |
kvn@679 | 352 | |
kvn@679 | 353 | PointsToNode::EdgeType et = ptt->edge_type(e); |
kvn@679 | 354 | if (et == PointsToNode::PointsToEdge) { |
kvn@679 | 355 | add_pointsto_edge(ni, etgt); |
kvn@679 | 356 | } else if (et == PointsToNode::DeferredEdge) { |
kvn@679 | 357 | deferred_edges->append(etgt); |
kvn@679 | 358 | } else { |
kvn@679 | 359 | assert(false,"invalid connection graph"); |
duke@435 | 360 | } |
duke@435 | 361 | } |
duke@435 | 362 | } |
kvn@3318 | 363 | if (ptn->edge_count() == 0) { |
kvn@3318 | 364 | // No pointsto edges found after deferred edges are removed. |
kvn@3318 | 365 | // For example, in the next case where call is replaced |
kvn@3318 | 366 | // with uncommon trap and as result array's load references |
kvn@3318 | 367 | // itself through deferred edges: |
kvn@3318 | 368 | // |
kvn@3318 | 369 | // A a = b[i]; |
kvn@3318 | 370 | // if (c!=null) a = c.foo(); |
kvn@3318 | 371 | // b[i] = a; |
kvn@3318 | 372 | // |
kvn@3318 | 373 | // Assume the value was set outside this method and |
kvn@3318 | 374 | // add edge to phantom object. |
kvn@3318 | 375 | add_pointsto_edge(ni, _phantom_object); |
kvn@3318 | 376 | } |
duke@435 | 377 | } |
duke@435 | 378 | |
duke@435 | 379 | |
duke@435 | 380 | // Add an edge to node given by "to_i" from any field of adr_i whose offset |
duke@435 | 381 | // matches "offset" A deferred edge is added if to_i is a LocalVar, and |
duke@435 | 382 | // a pointsto edge is added if it is a JavaObject |
duke@435 | 383 | |
duke@435 | 384 | void ConnectionGraph::add_edge_from_fields(uint adr_i, uint to_i, int offs) { |
kvn@3318 | 385 | // No fields for NULL pointer. |
kvn@3318 | 386 | if (is_null_ptr(adr_i)) { |
kvn@3318 | 387 | return; |
kvn@3318 | 388 | } |
kvn@679 | 389 | PointsToNode* an = ptnode_adr(adr_i); |
kvn@679 | 390 | PointsToNode* to = ptnode_adr(to_i); |
kvn@679 | 391 | bool deferred = (to->node_type() == PointsToNode::LocalVar); |
kvn@3318 | 392 | bool escaped = (to_i == _phantom_object) && (offs == Type::OffsetTop); |
kvn@3318 | 393 | if (escaped) { |
kvn@3318 | 394 | // Values in fields escaped during call. |
kvn@3318 | 395 | assert(an->escape_state() >= PointsToNode::ArgEscape, "sanity"); |
kvn@3318 | 396 | offs = Type::OffsetBot; |
kvn@3318 | 397 | } |
kvn@679 | 398 | for (uint fe = 0; fe < an->edge_count(); fe++) { |
kvn@679 | 399 | assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); |
kvn@679 | 400 | int fi = an->edge_target(fe); |
kvn@3318 | 401 | if (escaped) { |
kvn@3318 | 402 | set_escape_state(fi, PointsToNode::GlobalEscape); |
kvn@3318 | 403 | } |
kvn@679 | 404 | PointsToNode* pf = ptnode_adr(fi); |
kvn@679 | 405 | int po = pf->offset(); |
duke@435 | 406 | if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) { |
duke@435 | 407 | if (deferred) |
duke@435 | 408 | add_deferred_edge(fi, to_i); |
duke@435 | 409 | else |
duke@435 | 410 | add_pointsto_edge(fi, to_i); |
duke@435 | 411 | } |
duke@435 | 412 | } |
duke@435 | 413 | } |
duke@435 | 414 | |
kvn@500 | 415 | // Add a deferred edge from node given by "from_i" to any field of adr_i |
kvn@500 | 416 | // whose offset matches "offset". |
duke@435 | 417 | void ConnectionGraph::add_deferred_edge_to_fields(uint from_i, uint adr_i, int offs) { |
kvn@3318 | 418 | // No fields for NULL pointer. |
kvn@3318 | 419 | if (is_null_ptr(adr_i)) { |
kvn@3318 | 420 | return; |
kvn@3318 | 421 | } |
kvn@3318 | 422 | if (adr_i == _phantom_object) { |
kvn@3318 | 423 | // Add only one edge for unknown object. |
kvn@3318 | 424 | add_pointsto_edge(from_i, _phantom_object); |
kvn@3318 | 425 | return; |
kvn@3318 | 426 | } |
kvn@679 | 427 | PointsToNode* an = ptnode_adr(adr_i); |
kvn@3254 | 428 | bool is_alloc = an->_node->is_Allocate(); |
kvn@679 | 429 | for (uint fe = 0; fe < an->edge_count(); fe++) { |
kvn@679 | 430 | assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); |
kvn@679 | 431 | int fi = an->edge_target(fe); |
kvn@679 | 432 | PointsToNode* pf = ptnode_adr(fi); |
kvn@3254 | 433 | int offset = pf->offset(); |
kvn@3254 | 434 | if (!is_alloc) { |
kvn@3254 | 435 | // Assume the field was set outside this method if it is not Allocation |
duke@435 | 436 | add_pointsto_edge(fi, _phantom_object); |
duke@435 | 437 | } |
kvn@3254 | 438 | if (offset == offs || offset == Type::OffsetBot || offs == Type::OffsetBot) { |
duke@435 | 439 | add_deferred_edge(from_i, fi); |
duke@435 | 440 | } |
duke@435 | 441 | } |
kvn@3309 | 442 | // Some fields references (AddP) may still be missing |
kvn@3309 | 443 | // until Connection Graph construction is complete. |
kvn@3309 | 444 | // For example, loads from RAW pointers with offset 0 |
kvn@3309 | 445 | // which don't have AddP. |
kvn@3309 | 446 | // A reference to phantom_object will be added if |
kvn@3309 | 447 | // a field reference is still missing after completing |
kvn@3309 | 448 | // Connection Graph (see remove_deferred()). |
duke@435 | 449 | } |
duke@435 | 450 | |
kvn@500 | 451 | // Helper functions |
kvn@500 | 452 | |
kvn@500 | 453 | static Node* get_addp_base(Node *addp) { |
kvn@500 | 454 | assert(addp->is_AddP(), "must be AddP"); |
kvn@500 | 455 | // |
kvn@500 | 456 | // AddP cases for Base and Address inputs: |
kvn@500 | 457 | // case #1. Direct object's field reference: |
kvn@500 | 458 | // Allocate |
kvn@500 | 459 | // | |
kvn@500 | 460 | // Proj #5 ( oop result ) |
kvn@500 | 461 | // | |
kvn@500 | 462 | // CheckCastPP (cast to instance type) |
kvn@500 | 463 | // | | |
kvn@500 | 464 | // AddP ( base == address ) |
kvn@500 | 465 | // |
kvn@500 | 466 | // case #2. Indirect object's field reference: |
kvn@500 | 467 | // Phi |
kvn@500 | 468 | // | |
kvn@500 | 469 | // CastPP (cast to instance type) |
kvn@500 | 470 | // | | |
kvn@500 | 471 | // AddP ( base == address ) |
kvn@500 | 472 | // |
kvn@500 | 473 | // case #3. Raw object's field reference for Initialize node: |
kvn@500 | 474 | // Allocate |
kvn@500 | 475 | // | |
kvn@500 | 476 | // Proj #5 ( oop result ) |
kvn@500 | 477 | // top | |
kvn@500 | 478 | // \ | |
kvn@500 | 479 | // AddP ( base == top ) |
kvn@500 | 480 | // |
kvn@500 | 481 | // case #4. Array's element reference: |
kvn@500 | 482 | // {CheckCastPP | CastPP} |
kvn@500 | 483 | // | | | |
kvn@500 | 484 | // | AddP ( array's element offset ) |
kvn@500 | 485 | // | | |
kvn@500 | 486 | // AddP ( array's offset ) |
kvn@500 | 487 | // |
kvn@500 | 488 | // case #5. Raw object's field reference for arraycopy stub call: |
kvn@500 | 489 | // The inline_native_clone() case when the arraycopy stub is called |
kvn@500 | 490 | // after the allocation before Initialize and CheckCastPP nodes. |
kvn@500 | 491 | // Allocate |
kvn@500 | 492 | // | |
kvn@500 | 493 | // Proj #5 ( oop result ) |
kvn@500 | 494 | // | | |
kvn@500 | 495 | // AddP ( base == address ) |
kvn@500 | 496 | // |
kvn@512 | 497 | // case #6. Constant Pool, ThreadLocal, CastX2P or |
kvn@512 | 498 | // Raw object's field reference: |
kvn@512 | 499 | // {ConP, ThreadLocal, CastX2P, raw Load} |
kvn@500 | 500 | // top | |
kvn@500 | 501 | // \ | |
kvn@500 | 502 | // AddP ( base == top ) |
kvn@500 | 503 | // |
kvn@512 | 504 | // case #7. Klass's field reference. |
kvn@512 | 505 | // LoadKlass |
kvn@512 | 506 | // | | |
kvn@512 | 507 | // AddP ( base == address ) |
kvn@512 | 508 | // |
kvn@599 | 509 | // case #8. narrow Klass's field reference. |
kvn@599 | 510 | // LoadNKlass |
kvn@599 | 511 | // | |
kvn@599 | 512 | // DecodeN |
kvn@599 | 513 | // | | |
kvn@599 | 514 | // AddP ( base == address ) |
kvn@599 | 515 | // |
kvn@500 | 516 | Node *base = addp->in(AddPNode::Base)->uncast(); |
kvn@500 | 517 | if (base->is_top()) { // The AddP case #3 and #6. |
kvn@500 | 518 | base = addp->in(AddPNode::Address)->uncast(); |
kvn@1392 | 519 | while (base->is_AddP()) { |
kvn@1392 | 520 | // Case #6 (unsafe access) may have several chained AddP nodes. |
kvn@1392 | 521 | assert(base->in(AddPNode::Base)->is_top(), "expected unsafe access address only"); |
kvn@1392 | 522 | base = base->in(AddPNode::Address)->uncast(); |
kvn@1392 | 523 | } |
kvn@500 | 524 | assert(base->Opcode() == Op_ConP || base->Opcode() == Op_ThreadLocal || |
kvn@603 | 525 | base->Opcode() == Op_CastX2P || base->is_DecodeN() || |
kvn@512 | 526 | (base->is_Mem() && base->bottom_type() == TypeRawPtr::NOTNULL) || |
kvn@512 | 527 | (base->is_Proj() && base->in(0)->is_Allocate()), "sanity"); |
duke@435 | 528 | } |
kvn@500 | 529 | return base; |
kvn@500 | 530 | } |
kvn@500 | 531 | |
kvn@500 | 532 | static Node* find_second_addp(Node* addp, Node* n) { |
kvn@500 | 533 | assert(addp->is_AddP() && addp->outcnt() > 0, "Don't process dead nodes"); |
kvn@500 | 534 | |
kvn@500 | 535 | Node* addp2 = addp->raw_out(0); |
kvn@500 | 536 | if (addp->outcnt() == 1 && addp2->is_AddP() && |
kvn@500 | 537 | addp2->in(AddPNode::Base) == n && |
kvn@500 | 538 | addp2->in(AddPNode::Address) == addp) { |
kvn@500 | 539 | |
kvn@500 | 540 | assert(addp->in(AddPNode::Base) == n, "expecting the same base"); |
kvn@500 | 541 | // |
kvn@500 | 542 | // Find array's offset to push it on worklist first and |
kvn@500 | 543 | // as result process an array's element offset first (pushed second) |
kvn@500 | 544 | // to avoid CastPP for the array's offset. |
kvn@500 | 545 | // Otherwise the inserted CastPP (LocalVar) will point to what |
kvn@500 | 546 | // the AddP (Field) points to. Which would be wrong since |
kvn@500 | 547 | // the algorithm expects the CastPP has the same point as |
kvn@500 | 548 | // as AddP's base CheckCastPP (LocalVar). |
kvn@500 | 549 | // |
kvn@500 | 550 | // ArrayAllocation |
kvn@500 | 551 | // | |
kvn@500 | 552 | // CheckCastPP |
kvn@500 | 553 | // | |
kvn@500 | 554 | // memProj (from ArrayAllocation CheckCastPP) |
kvn@500 | 555 | // | || |
kvn@500 | 556 | // | || Int (element index) |
kvn@500 | 557 | // | || | ConI (log(element size)) |
kvn@500 | 558 | // | || | / |
kvn@500 | 559 | // | || LShift |
kvn@500 | 560 | // | || / |
kvn@500 | 561 | // | AddP (array's element offset) |
kvn@500 | 562 | // | | |
kvn@500 | 563 | // | | ConI (array's offset: #12(32-bits) or #24(64-bits)) |
kvn@500 | 564 | // | / / |
kvn@500 | 565 | // AddP (array's offset) |
kvn@500 | 566 | // | |
kvn@500 | 567 | // Load/Store (memory operation on array's element) |
kvn@500 | 568 | // |
kvn@500 | 569 | return addp2; |
kvn@500 | 570 | } |
kvn@500 | 571 | return NULL; |
duke@435 | 572 | } |
duke@435 | 573 | |
duke@435 | 574 | // |
duke@435 | 575 | // Adjust the type and inputs of an AddP which computes the |
duke@435 | 576 | // address of a field of an instance |
duke@435 | 577 | // |
kvn@728 | 578 | bool ConnectionGraph::split_AddP(Node *addp, Node *base, PhaseGVN *igvn) { |
kvn@500 | 579 | const TypeOopPtr *base_t = igvn->type(base)->isa_oopptr(); |
kvn@658 | 580 | assert(base_t != NULL && base_t->is_known_instance(), "expecting instance oopptr"); |
duke@435 | 581 | const TypeOopPtr *t = igvn->type(addp)->isa_oopptr(); |
kvn@500 | 582 | if (t == NULL) { |
kvn@500 | 583 | // We are computing a raw address for a store captured by an Initialize |
kvn@728 | 584 | // compute an appropriate address type (cases #3 and #5). |
kvn@500 | 585 | assert(igvn->type(addp) == TypeRawPtr::NOTNULL, "must be raw pointer"); |
kvn@500 | 586 | assert(addp->in(AddPNode::Address)->is_Proj(), "base of raw address must be result projection from allocation"); |
kvn@741 | 587 | intptr_t offs = (int)igvn->find_intptr_t_con(addp->in(AddPNode::Offset), Type::OffsetBot); |
kvn@500 | 588 | assert(offs != Type::OffsetBot, "offset must be a constant"); |
kvn@500 | 589 | t = base_t->add_offset(offs)->is_oopptr(); |
kvn@500 | 590 | } |
kvn@658 | 591 | int inst_id = base_t->instance_id(); |
kvn@658 | 592 | assert(!t->is_known_instance() || t->instance_id() == inst_id, |
duke@435 | 593 | "old type must be non-instance or match new type"); |
kvn@728 | 594 | |
kvn@728 | 595 | // The type 't' could be subclass of 'base_t'. |
kvn@728 | 596 | // As result t->offset() could be large then base_t's size and it will |
kvn@728 | 597 | // cause the failure in add_offset() with narrow oops since TypeOopPtr() |
kvn@728 | 598 | // constructor verifies correctness of the offset. |
kvn@728 | 599 | // |
twisti@1040 | 600 | // It could happened on subclass's branch (from the type profiling |
kvn@728 | 601 | // inlining) which was not eliminated during parsing since the exactness |
kvn@728 | 602 | // of the allocation type was not propagated to the subclass type check. |
kvn@728 | 603 | // |
kvn@1423 | 604 | // Or the type 't' could be not related to 'base_t' at all. |
kvn@1423 | 605 | // It could happened when CHA type is different from MDO type on a dead path |
kvn@1423 | 606 | // (for example, from instanceof check) which is not collapsed during parsing. |
kvn@1423 | 607 | // |
kvn@728 | 608 | // Do nothing for such AddP node and don't process its users since |
kvn@728 | 609 | // this code branch will go away. |
kvn@728 | 610 | // |
kvn@728 | 611 | if (!t->is_known_instance() && |
kvn@1423 | 612 | !base_t->klass()->is_subtype_of(t->klass())) { |
kvn@728 | 613 | return false; // bail out |
kvn@728 | 614 | } |
kvn@728 | 615 | |
duke@435 | 616 | const TypeOopPtr *tinst = base_t->add_offset(t->offset())->is_oopptr(); |
kvn@1497 | 617 | // Do NOT remove the next line: ensure a new alias index is allocated |
kvn@1497 | 618 | // for the instance type. Note: C++ will not remove it since the call |
kvn@1497 | 619 | // has side effect. |
duke@435 | 620 | int alias_idx = _compile->get_alias_index(tinst); |
duke@435 | 621 | igvn->set_type(addp, tinst); |
duke@435 | 622 | // record the allocation in the node map |
kvn@1536 | 623 | assert(ptnode_adr(addp->_idx)->_node != NULL, "should be registered"); |
duke@435 | 624 | set_map(addp->_idx, get_map(base->_idx)); |
kvn@688 | 625 | |
kvn@688 | 626 | // Set addp's Base and Address to 'base'. |
kvn@688 | 627 | Node *abase = addp->in(AddPNode::Base); |
kvn@688 | 628 | Node *adr = addp->in(AddPNode::Address); |
kvn@688 | 629 | if (adr->is_Proj() && adr->in(0)->is_Allocate() && |
kvn@688 | 630 | adr->in(0)->_idx == (uint)inst_id) { |
kvn@688 | 631 | // Skip AddP cases #3 and #5. |
kvn@688 | 632 | } else { |
kvn@688 | 633 | assert(!abase->is_top(), "sanity"); // AddP case #3 |
kvn@688 | 634 | if (abase != base) { |
kvn@688 | 635 | igvn->hash_delete(addp); |
kvn@688 | 636 | addp->set_req(AddPNode::Base, base); |
kvn@688 | 637 | if (abase == adr) { |
kvn@688 | 638 | addp->set_req(AddPNode::Address, base); |
kvn@688 | 639 | } else { |
kvn@688 | 640 | // AddP case #4 (adr is array's element offset AddP node) |
kvn@688 | 641 | #ifdef ASSERT |
kvn@688 | 642 | const TypeOopPtr *atype = igvn->type(adr)->isa_oopptr(); |
kvn@688 | 643 | assert(adr->is_AddP() && atype != NULL && |
kvn@688 | 644 | atype->instance_id() == inst_id, "array's element offset should be processed first"); |
kvn@688 | 645 | #endif |
kvn@688 | 646 | } |
kvn@688 | 647 | igvn->hash_insert(addp); |
duke@435 | 648 | } |
duke@435 | 649 | } |
kvn@500 | 650 | // Put on IGVN worklist since at least addp's type was changed above. |
kvn@500 | 651 | record_for_optimizer(addp); |
kvn@728 | 652 | return true; |
duke@435 | 653 | } |
duke@435 | 654 | |
duke@435 | 655 | // |
duke@435 | 656 | // Create a new version of orig_phi if necessary. Returns either the newly |
kvn@2741 | 657 | // created phi or an existing phi. Sets create_new to indicate whether a new |
duke@435 | 658 | // phi was created. Cache the last newly created phi in the node map. |
duke@435 | 659 | // |
duke@435 | 660 | PhiNode *ConnectionGraph::create_split_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn, bool &new_created) { |
duke@435 | 661 | Compile *C = _compile; |
duke@435 | 662 | new_created = false; |
duke@435 | 663 | int phi_alias_idx = C->get_alias_index(orig_phi->adr_type()); |
duke@435 | 664 | // nothing to do if orig_phi is bottom memory or matches alias_idx |
kvn@500 | 665 | if (phi_alias_idx == alias_idx) { |
duke@435 | 666 | return orig_phi; |
duke@435 | 667 | } |
kvn@1286 | 668 | // Have we recently created a Phi for this alias index? |
duke@435 | 669 | PhiNode *result = get_map_phi(orig_phi->_idx); |
duke@435 | 670 | if (result != NULL && C->get_alias_index(result->adr_type()) == alias_idx) { |
duke@435 | 671 | return result; |
duke@435 | 672 | } |
kvn@1286 | 673 | // Previous check may fail when the same wide memory Phi was split into Phis |
kvn@1286 | 674 | // for different memory slices. Search all Phis for this region. |
kvn@1286 | 675 | if (result != NULL) { |
kvn@1286 | 676 | Node* region = orig_phi->in(0); |
kvn@1286 | 677 | for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
kvn@1286 | 678 | Node* phi = region->fast_out(i); |
kvn@1286 | 679 | if (phi->is_Phi() && |
kvn@1286 | 680 | C->get_alias_index(phi->as_Phi()->adr_type()) == alias_idx) { |
kvn@1286 | 681 | assert(phi->_idx >= nodes_size(), "only new Phi per instance memory slice"); |
kvn@1286 | 682 | return phi->as_Phi(); |
kvn@1286 | 683 | } |
kvn@1286 | 684 | } |
kvn@1286 | 685 | } |
kvn@473 | 686 | if ((int)C->unique() + 2*NodeLimitFudgeFactor > MaxNodeLimit) { |
kvn@473 | 687 | if (C->do_escape_analysis() == true && !C->failing()) { |
kvn@473 | 688 | // Retry compilation without escape analysis. |
kvn@473 | 689 | // If this is the first failure, the sentinel string will "stick" |
kvn@473 | 690 | // to the Compile object, and the C2Compiler will see it and retry. |
kvn@473 | 691 | C->record_failure(C2Compiler::retry_no_escape_analysis()); |
kvn@473 | 692 | } |
kvn@473 | 693 | return NULL; |
kvn@473 | 694 | } |
duke@435 | 695 | orig_phi_worklist.append_if_missing(orig_phi); |
kvn@500 | 696 | const TypePtr *atype = C->get_adr_type(alias_idx); |
duke@435 | 697 | result = PhiNode::make(orig_phi->in(0), NULL, Type::MEMORY, atype); |
kvn@1286 | 698 | C->copy_node_notes_to(result, orig_phi); |
duke@435 | 699 | igvn->set_type(result, result->bottom_type()); |
duke@435 | 700 | record_for_optimizer(result); |
kvn@1536 | 701 | |
kvn@1536 | 702 | debug_only(Node* pn = ptnode_adr(orig_phi->_idx)->_node;) |
kvn@1536 | 703 | assert(pn == NULL || pn == orig_phi, "wrong node"); |
kvn@1536 | 704 | set_map(orig_phi->_idx, result); |
kvn@1536 | 705 | ptnode_adr(orig_phi->_idx)->_node = orig_phi; |
kvn@1536 | 706 | |
duke@435 | 707 | new_created = true; |
duke@435 | 708 | return result; |
duke@435 | 709 | } |
duke@435 | 710 | |
duke@435 | 711 | // |
kvn@2741 | 712 | // Return a new version of Memory Phi "orig_phi" with the inputs having the |
duke@435 | 713 | // specified alias index. |
duke@435 | 714 | // |
duke@435 | 715 | PhiNode *ConnectionGraph::split_memory_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn) { |
duke@435 | 716 | |
duke@435 | 717 | assert(alias_idx != Compile::AliasIdxBot, "can't split out bottom memory"); |
duke@435 | 718 | Compile *C = _compile; |
duke@435 | 719 | bool new_phi_created; |
kvn@500 | 720 | PhiNode *result = create_split_phi(orig_phi, alias_idx, orig_phi_worklist, igvn, new_phi_created); |
duke@435 | 721 | if (!new_phi_created) { |
duke@435 | 722 | return result; |
duke@435 | 723 | } |
duke@435 | 724 | |
duke@435 | 725 | GrowableArray<PhiNode *> phi_list; |
duke@435 | 726 | GrowableArray<uint> cur_input; |
duke@435 | 727 | |
duke@435 | 728 | PhiNode *phi = orig_phi; |
duke@435 | 729 | uint idx = 1; |
duke@435 | 730 | bool finished = false; |
duke@435 | 731 | while(!finished) { |
duke@435 | 732 | while (idx < phi->req()) { |
kvn@500 | 733 | Node *mem = find_inst_mem(phi->in(idx), alias_idx, orig_phi_worklist, igvn); |
duke@435 | 734 | if (mem != NULL && mem->is_Phi()) { |
kvn@500 | 735 | PhiNode *newphi = create_split_phi(mem->as_Phi(), alias_idx, orig_phi_worklist, igvn, new_phi_created); |
duke@435 | 736 | if (new_phi_created) { |
duke@435 | 737 | // found an phi for which we created a new split, push current one on worklist and begin |
duke@435 | 738 | // processing new one |
duke@435 | 739 | phi_list.push(phi); |
duke@435 | 740 | cur_input.push(idx); |
duke@435 | 741 | phi = mem->as_Phi(); |
kvn@500 | 742 | result = newphi; |
duke@435 | 743 | idx = 1; |
duke@435 | 744 | continue; |
duke@435 | 745 | } else { |
kvn@500 | 746 | mem = newphi; |
duke@435 | 747 | } |
duke@435 | 748 | } |
kvn@473 | 749 | if (C->failing()) { |
kvn@473 | 750 | return NULL; |
kvn@473 | 751 | } |
duke@435 | 752 | result->set_req(idx++, mem); |
duke@435 | 753 | } |
duke@435 | 754 | #ifdef ASSERT |
duke@435 | 755 | // verify that the new Phi has an input for each input of the original |
duke@435 | 756 | assert( phi->req() == result->req(), "must have same number of inputs."); |
duke@435 | 757 | assert( result->in(0) != NULL && result->in(0) == phi->in(0), "regions must match"); |
kvn@500 | 758 | #endif |
kvn@500 | 759 | // Check if all new phi's inputs have specified alias index. |
kvn@500 | 760 | // Otherwise use old phi. |
duke@435 | 761 | for (uint i = 1; i < phi->req(); i++) { |
kvn@500 | 762 | Node* in = result->in(i); |
kvn@500 | 763 | assert((phi->in(i) == NULL) == (in == NULL), "inputs must correspond."); |
duke@435 | 764 | } |
duke@435 | 765 | // we have finished processing a Phi, see if there are any more to do |
duke@435 | 766 | finished = (phi_list.length() == 0 ); |
duke@435 | 767 | if (!finished) { |
duke@435 | 768 | phi = phi_list.pop(); |
duke@435 | 769 | idx = cur_input.pop(); |
kvn@500 | 770 | PhiNode *prev_result = get_map_phi(phi->_idx); |
kvn@500 | 771 | prev_result->set_req(idx++, result); |
kvn@500 | 772 | result = prev_result; |
duke@435 | 773 | } |
duke@435 | 774 | } |
duke@435 | 775 | return result; |
duke@435 | 776 | } |
duke@435 | 777 | |
kvn@500 | 778 | |
kvn@500 | 779 | // |
kvn@500 | 780 | // The next methods are derived from methods in MemNode. |
kvn@500 | 781 | // |
never@2170 | 782 | static Node *step_through_mergemem(MergeMemNode *mmem, int alias_idx, const TypeOopPtr *toop) { |
kvn@500 | 783 | Node *mem = mmem; |
never@2170 | 784 | // TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally |
kvn@500 | 785 | // means an array I have not precisely typed yet. Do not do any |
kvn@500 | 786 | // alias stuff with it any time soon. |
never@2170 | 787 | if( toop->base() != Type::AnyPtr && |
never@2170 | 788 | !(toop->klass() != NULL && |
never@2170 | 789 | toop->klass()->is_java_lang_Object() && |
never@2170 | 790 | toop->offset() == Type::OffsetBot) ) { |
kvn@500 | 791 | mem = mmem->memory_at(alias_idx); |
kvn@500 | 792 | // Update input if it is progress over what we have now |
kvn@500 | 793 | } |
kvn@500 | 794 | return mem; |
kvn@500 | 795 | } |
kvn@500 | 796 | |
kvn@500 | 797 | // |
kvn@1536 | 798 | // Move memory users to their memory slices. |
kvn@1536 | 799 | // |
kvn@1536 | 800 | void ConnectionGraph::move_inst_mem(Node* n, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *igvn) { |
kvn@1536 | 801 | Compile* C = _compile; |
kvn@1536 | 802 | |
kvn@1536 | 803 | const TypePtr* tp = igvn->type(n->in(MemNode::Address))->isa_ptr(); |
kvn@1536 | 804 | assert(tp != NULL, "ptr type"); |
kvn@1536 | 805 | int alias_idx = C->get_alias_index(tp); |
kvn@1536 | 806 | int general_idx = C->get_general_index(alias_idx); |
kvn@1536 | 807 | |
kvn@1536 | 808 | // Move users first |
kvn@1536 | 809 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
kvn@1536 | 810 | Node* use = n->fast_out(i); |
kvn@1536 | 811 | if (use->is_MergeMem()) { |
kvn@1536 | 812 | MergeMemNode* mmem = use->as_MergeMem(); |
kvn@1536 | 813 | assert(n == mmem->memory_at(alias_idx), "should be on instance memory slice"); |
kvn@1536 | 814 | if (n != mmem->memory_at(general_idx) || alias_idx == general_idx) { |
kvn@1536 | 815 | continue; // Nothing to do |
kvn@1536 | 816 | } |
kvn@1536 | 817 | // Replace previous general reference to mem node. |
kvn@1536 | 818 | uint orig_uniq = C->unique(); |
kvn@1536 | 819 | Node* m = find_inst_mem(n, general_idx, orig_phis, igvn); |
kvn@1536 | 820 | assert(orig_uniq == C->unique(), "no new nodes"); |
kvn@1536 | 821 | mmem->set_memory_at(general_idx, m); |
kvn@1536 | 822 | --imax; |
kvn@1536 | 823 | --i; |
kvn@1536 | 824 | } else if (use->is_MemBar()) { |
kvn@1536 | 825 | assert(!use->is_Initialize(), "initializing stores should not be moved"); |
kvn@1536 | 826 | if (use->req() > MemBarNode::Precedent && |
kvn@1536 | 827 | use->in(MemBarNode::Precedent) == n) { |
kvn@1536 | 828 | // Don't move related membars. |
kvn@1536 | 829 | record_for_optimizer(use); |
kvn@1536 | 830 | continue; |
kvn@1536 | 831 | } |
kvn@1536 | 832 | tp = use->as_MemBar()->adr_type()->isa_ptr(); |
kvn@1536 | 833 | if (tp != NULL && C->get_alias_index(tp) == alias_idx || |
kvn@1536 | 834 | alias_idx == general_idx) { |
kvn@1536 | 835 | continue; // Nothing to do |
kvn@1536 | 836 | } |
kvn@1536 | 837 | // Move to general memory slice. |
kvn@1536 | 838 | uint orig_uniq = C->unique(); |
kvn@1536 | 839 | Node* m = find_inst_mem(n, general_idx, orig_phis, igvn); |
kvn@1536 | 840 | assert(orig_uniq == C->unique(), "no new nodes"); |
kvn@1536 | 841 | igvn->hash_delete(use); |
kvn@1536 | 842 | imax -= use->replace_edge(n, m); |
kvn@1536 | 843 | igvn->hash_insert(use); |
kvn@1536 | 844 | record_for_optimizer(use); |
kvn@1536 | 845 | --i; |
kvn@1536 | 846 | #ifdef ASSERT |
kvn@1536 | 847 | } else if (use->is_Mem()) { |
kvn@1536 | 848 | if (use->Opcode() == Op_StoreCM && use->in(MemNode::OopStore) == n) { |
kvn@1536 | 849 | // Don't move related cardmark. |
kvn@1536 | 850 | continue; |
kvn@1536 | 851 | } |
kvn@1536 | 852 | // Memory nodes should have new memory input. |
kvn@1536 | 853 | tp = igvn->type(use->in(MemNode::Address))->isa_ptr(); |
kvn@1536 | 854 | assert(tp != NULL, "ptr type"); |
kvn@1536 | 855 | int idx = C->get_alias_index(tp); |
kvn@1536 | 856 | assert(get_map(use->_idx) != NULL || idx == alias_idx, |
kvn@1536 | 857 | "Following memory nodes should have new memory input or be on the same memory slice"); |
kvn@1536 | 858 | } else if (use->is_Phi()) { |
kvn@1536 | 859 | // Phi nodes should be split and moved already. |
kvn@1536 | 860 | tp = use->as_Phi()->adr_type()->isa_ptr(); |
kvn@1536 | 861 | assert(tp != NULL, "ptr type"); |
kvn@1536 | 862 | int idx = C->get_alias_index(tp); |
kvn@1536 | 863 | assert(idx == alias_idx, "Following Phi nodes should be on the same memory slice"); |
kvn@1536 | 864 | } else { |
kvn@1536 | 865 | use->dump(); |
kvn@1536 | 866 | assert(false, "should not be here"); |
kvn@1536 | 867 | #endif |
kvn@1536 | 868 | } |
kvn@1536 | 869 | } |
kvn@1536 | 870 | } |
kvn@1536 | 871 | |
kvn@1536 | 872 | // |
kvn@500 | 873 | // Search memory chain of "mem" to find a MemNode whose address |
kvn@500 | 874 | // is the specified alias index. |
kvn@500 | 875 | // |
kvn@500 | 876 | Node* ConnectionGraph::find_inst_mem(Node *orig_mem, int alias_idx, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *phase) { |
kvn@500 | 877 | if (orig_mem == NULL) |
kvn@500 | 878 | return orig_mem; |
kvn@500 | 879 | Compile* C = phase->C; |
never@2170 | 880 | const TypeOopPtr *toop = C->get_adr_type(alias_idx)->isa_oopptr(); |
never@2170 | 881 | bool is_instance = (toop != NULL) && toop->is_known_instance(); |
kvn@688 | 882 | Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
kvn@500 | 883 | Node *prev = NULL; |
kvn@500 | 884 | Node *result = orig_mem; |
kvn@500 | 885 | while (prev != result) { |
kvn@500 | 886 | prev = result; |
kvn@688 | 887 | if (result == start_mem) |
twisti@1040 | 888 | break; // hit one of our sentinels |
kvn@500 | 889 | if (result->is_Mem()) { |
kvn@688 | 890 | const Type *at = phase->type(result->in(MemNode::Address)); |
kvn@2741 | 891 | if (at == Type::TOP) |
kvn@2741 | 892 | break; // Dead |
kvn@2741 | 893 | assert (at->isa_ptr() != NULL, "pointer type required."); |
kvn@2741 | 894 | int idx = C->get_alias_index(at->is_ptr()); |
kvn@2741 | 895 | if (idx == alias_idx) |
kvn@2741 | 896 | break; // Found |
kvn@2741 | 897 | if (!is_instance && (at->isa_oopptr() == NULL || |
kvn@2741 | 898 | !at->is_oopptr()->is_known_instance())) { |
kvn@2741 | 899 | break; // Do not skip store to general memory slice. |
kvn@500 | 900 | } |
kvn@688 | 901 | result = result->in(MemNode::Memory); |
kvn@500 | 902 | } |
kvn@500 | 903 | if (!is_instance) |
kvn@500 | 904 | continue; // don't search further for non-instance types |
kvn@500 | 905 | // skip over a call which does not affect this memory slice |
kvn@500 | 906 | if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { |
kvn@500 | 907 | Node *proj_in = result->in(0); |
never@2170 | 908 | if (proj_in->is_Allocate() && proj_in->_idx == (uint)toop->instance_id()) { |
twisti@1040 | 909 | break; // hit one of our sentinels |
kvn@688 | 910 | } else if (proj_in->is_Call()) { |
kvn@500 | 911 | CallNode *call = proj_in->as_Call(); |
never@2170 | 912 | if (!call->may_modify(toop, phase)) { |
kvn@500 | 913 | result = call->in(TypeFunc::Memory); |
kvn@500 | 914 | } |
kvn@500 | 915 | } else if (proj_in->is_Initialize()) { |
kvn@500 | 916 | AllocateNode* alloc = proj_in->as_Initialize()->allocation(); |
kvn@500 | 917 | // Stop if this is the initialization for the object instance which |
kvn@500 | 918 | // which contains this memory slice, otherwise skip over it. |
never@2170 | 919 | if (alloc == NULL || alloc->_idx != (uint)toop->instance_id()) { |
kvn@500 | 920 | result = proj_in->in(TypeFunc::Memory); |
kvn@500 | 921 | } |
kvn@500 | 922 | } else if (proj_in->is_MemBar()) { |
kvn@500 | 923 | result = proj_in->in(TypeFunc::Memory); |
kvn@500 | 924 | } |
kvn@500 | 925 | } else if (result->is_MergeMem()) { |
kvn@500 | 926 | MergeMemNode *mmem = result->as_MergeMem(); |
never@2170 | 927 | result = step_through_mergemem(mmem, alias_idx, toop); |
kvn@500 | 928 | if (result == mmem->base_memory()) { |
kvn@500 | 929 | // Didn't find instance memory, search through general slice recursively. |
kvn@500 | 930 | result = mmem->memory_at(C->get_general_index(alias_idx)); |
kvn@500 | 931 | result = find_inst_mem(result, alias_idx, orig_phis, phase); |
kvn@500 | 932 | if (C->failing()) { |
kvn@500 | 933 | return NULL; |
kvn@500 | 934 | } |
kvn@500 | 935 | mmem->set_memory_at(alias_idx, result); |
kvn@500 | 936 | } |
kvn@500 | 937 | } else if (result->is_Phi() && |
kvn@500 | 938 | C->get_alias_index(result->as_Phi()->adr_type()) != alias_idx) { |
kvn@500 | 939 | Node *un = result->as_Phi()->unique_input(phase); |
kvn@500 | 940 | if (un != NULL) { |
kvn@1536 | 941 | orig_phis.append_if_missing(result->as_Phi()); |
kvn@500 | 942 | result = un; |
kvn@500 | 943 | } else { |
kvn@500 | 944 | break; |
kvn@500 | 945 | } |
kvn@1535 | 946 | } else if (result->is_ClearArray()) { |
never@2170 | 947 | if (!ClearArrayNode::step_through(&result, (uint)toop->instance_id(), phase)) { |
kvn@1535 | 948 | // Can not bypass initialization of the instance |
kvn@1535 | 949 | // we are looking for. |
kvn@1535 | 950 | break; |
kvn@1535 | 951 | } |
kvn@1535 | 952 | // Otherwise skip it (the call updated 'result' value). |
kvn@1019 | 953 | } else if (result->Opcode() == Op_SCMemProj) { |
kvn@1019 | 954 | assert(result->in(0)->is_LoadStore(), "sanity"); |
kvn@1019 | 955 | const Type *at = phase->type(result->in(0)->in(MemNode::Address)); |
kvn@1019 | 956 | if (at != Type::TOP) { |
kvn@1019 | 957 | assert (at->isa_ptr() != NULL, "pointer type required."); |
kvn@1019 | 958 | int idx = C->get_alias_index(at->is_ptr()); |
kvn@1019 | 959 | assert(idx != alias_idx, "Object is not scalar replaceable if a LoadStore node access its field"); |
kvn@1019 | 960 | break; |
kvn@1019 | 961 | } |
kvn@1019 | 962 | result = result->in(0)->in(MemNode::Memory); |
kvn@500 | 963 | } |
kvn@500 | 964 | } |
kvn@682 | 965 | if (result->is_Phi()) { |
kvn@500 | 966 | PhiNode *mphi = result->as_Phi(); |
kvn@500 | 967 | assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); |
kvn@500 | 968 | const TypePtr *t = mphi->adr_type(); |
kvn@2741 | 969 | if (!is_instance) { |
kvn@682 | 970 | // Push all non-instance Phis on the orig_phis worklist to update inputs |
kvn@682 | 971 | // during Phase 4 if needed. |
kvn@682 | 972 | orig_phis.append_if_missing(mphi); |
kvn@2741 | 973 | } else if (C->get_alias_index(t) != alias_idx) { |
kvn@2741 | 974 | // Create a new Phi with the specified alias index type. |
kvn@2741 | 975 | result = split_memory_phi(mphi, alias_idx, orig_phis, phase); |
kvn@500 | 976 | } |
kvn@500 | 977 | } |
kvn@500 | 978 | // the result is either MemNode, PhiNode, InitializeNode. |
kvn@500 | 979 | return result; |
kvn@500 | 980 | } |
kvn@500 | 981 | |
duke@435 | 982 | // |
duke@435 | 983 | // Convert the types of unescaped object to instance types where possible, |
duke@435 | 984 | // propagate the new type information through the graph, and update memory |
duke@435 | 985 | // edges and MergeMem inputs to reflect the new type. |
duke@435 | 986 | // |
duke@435 | 987 | // We start with allocations (and calls which may be allocations) on alloc_worklist. |
duke@435 | 988 | // The processing is done in 4 phases: |
duke@435 | 989 | // |
duke@435 | 990 | // Phase 1: Process possible allocations from alloc_worklist. Create instance |
duke@435 | 991 | // types for the CheckCastPP for allocations where possible. |
duke@435 | 992 | // Propagate the the new types through users as follows: |
duke@435 | 993 | // casts and Phi: push users on alloc_worklist |
duke@435 | 994 | // AddP: cast Base and Address inputs to the instance type |
duke@435 | 995 | // push any AddP users on alloc_worklist and push any memnode |
duke@435 | 996 | // users onto memnode_worklist. |
duke@435 | 997 | // Phase 2: Process MemNode's from memnode_worklist. compute new address type and |
duke@435 | 998 | // search the Memory chain for a store with the appropriate type |
duke@435 | 999 | // address type. If a Phi is found, create a new version with |
twisti@1040 | 1000 | // the appropriate memory slices from each of the Phi inputs. |
duke@435 | 1001 | // For stores, process the users as follows: |
duke@435 | 1002 | // MemNode: push on memnode_worklist |
duke@435 | 1003 | // MergeMem: push on mergemem_worklist |
duke@435 | 1004 | // Phase 3: Process MergeMem nodes from mergemem_worklist. Walk each memory slice |
duke@435 | 1005 | // moving the first node encountered of each instance type to the |
duke@435 | 1006 | // the input corresponding to its alias index. |
duke@435 | 1007 | // appropriate memory slice. |
duke@435 | 1008 | // Phase 4: Update the inputs of non-instance memory Phis and the Memory input of memnodes. |
duke@435 | 1009 | // |
duke@435 | 1010 | // In the following example, the CheckCastPP nodes are the cast of allocation |
duke@435 | 1011 | // results and the allocation of node 29 is unescaped and eligible to be an |
duke@435 | 1012 | // instance type. |
duke@435 | 1013 | // |
duke@435 | 1014 | // We start with: |
duke@435 | 1015 | // |
duke@435 | 1016 | // 7 Parm #memory |
duke@435 | 1017 | // 10 ConI "12" |
duke@435 | 1018 | // 19 CheckCastPP "Foo" |
duke@435 | 1019 | // 20 AddP _ 19 19 10 Foo+12 alias_index=4 |
duke@435 | 1020 | // 29 CheckCastPP "Foo" |
duke@435 | 1021 | // 30 AddP _ 29 29 10 Foo+12 alias_index=4 |
duke@435 | 1022 | // |
duke@435 | 1023 | // 40 StoreP 25 7 20 ... alias_index=4 |
duke@435 | 1024 | // 50 StoreP 35 40 30 ... alias_index=4 |
duke@435 | 1025 | // 60 StoreP 45 50 20 ... alias_index=4 |
duke@435 | 1026 | // 70 LoadP _ 60 30 ... alias_index=4 |
duke@435 | 1027 | // 80 Phi 75 50 60 Memory alias_index=4 |
duke@435 | 1028 | // 90 LoadP _ 80 30 ... alias_index=4 |
duke@435 | 1029 | // 100 LoadP _ 80 20 ... alias_index=4 |
duke@435 | 1030 | // |
duke@435 | 1031 | // |
duke@435 | 1032 | // Phase 1 creates an instance type for node 29 assigning it an instance id of 24 |
duke@435 | 1033 | // and creating a new alias index for node 30. This gives: |
duke@435 | 1034 | // |
duke@435 | 1035 | // 7 Parm #memory |
duke@435 | 1036 | // 10 ConI "12" |
duke@435 | 1037 | // 19 CheckCastPP "Foo" |
duke@435 | 1038 | // 20 AddP _ 19 19 10 Foo+12 alias_index=4 |
duke@435 | 1039 | // 29 CheckCastPP "Foo" iid=24 |
duke@435 | 1040 | // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24 |
duke@435 | 1041 | // |
duke@435 | 1042 | // 40 StoreP 25 7 20 ... alias_index=4 |
duke@435 | 1043 | // 50 StoreP 35 40 30 ... alias_index=6 |
duke@435 | 1044 | // 60 StoreP 45 50 20 ... alias_index=4 |
duke@435 | 1045 | // 70 LoadP _ 60 30 ... alias_index=6 |
duke@435 | 1046 | // 80 Phi 75 50 60 Memory alias_index=4 |
duke@435 | 1047 | // 90 LoadP _ 80 30 ... alias_index=6 |
duke@435 | 1048 | // 100 LoadP _ 80 20 ... alias_index=4 |
duke@435 | 1049 | // |
duke@435 | 1050 | // In phase 2, new memory inputs are computed for the loads and stores, |
duke@435 | 1051 | // And a new version of the phi is created. In phase 4, the inputs to |
duke@435 | 1052 | // node 80 are updated and then the memory nodes are updated with the |
duke@435 | 1053 | // values computed in phase 2. This results in: |
duke@435 | 1054 | // |
duke@435 | 1055 | // 7 Parm #memory |
duke@435 | 1056 | // 10 ConI "12" |
duke@435 | 1057 | // 19 CheckCastPP "Foo" |
duke@435 | 1058 | // 20 AddP _ 19 19 10 Foo+12 alias_index=4 |
duke@435 | 1059 | // 29 CheckCastPP "Foo" iid=24 |
duke@435 | 1060 | // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24 |
duke@435 | 1061 | // |
duke@435 | 1062 | // 40 StoreP 25 7 20 ... alias_index=4 |
duke@435 | 1063 | // 50 StoreP 35 7 30 ... alias_index=6 |
duke@435 | 1064 | // 60 StoreP 45 40 20 ... alias_index=4 |
duke@435 | 1065 | // 70 LoadP _ 50 30 ... alias_index=6 |
duke@435 | 1066 | // 80 Phi 75 40 60 Memory alias_index=4 |
duke@435 | 1067 | // 120 Phi 75 50 50 Memory alias_index=6 |
duke@435 | 1068 | // 90 LoadP _ 120 30 ... alias_index=6 |
duke@435 | 1069 | // 100 LoadP _ 80 20 ... alias_index=4 |
duke@435 | 1070 | // |
duke@435 | 1071 | void ConnectionGraph::split_unique_types(GrowableArray<Node *> &alloc_worklist) { |
duke@435 | 1072 | GrowableArray<Node *> memnode_worklist; |
duke@435 | 1073 | GrowableArray<PhiNode *> orig_phis; |
kvn@1536 | 1074 | |
kvn@2276 | 1075 | PhaseIterGVN *igvn = _igvn; |
duke@435 | 1076 | uint new_index_start = (uint) _compile->num_alias_types(); |
kvn@1536 | 1077 | Arena* arena = Thread::current()->resource_area(); |
kvn@1536 | 1078 | VectorSet visited(arena); |
duke@435 | 1079 | |
kvn@500 | 1080 | |
kvn@500 | 1081 | // Phase 1: Process possible allocations from alloc_worklist. |
kvn@500 | 1082 | // Create instance types for the CheckCastPP for allocations where possible. |
kvn@679 | 1083 | // |
kvn@679 | 1084 | // (Note: don't forget to change the order of the second AddP node on |
kvn@679 | 1085 | // the alloc_worklist if the order of the worklist processing is changed, |
kvn@679 | 1086 | // see the comment in find_second_addp().) |
kvn@679 | 1087 | // |
duke@435 | 1088 | while (alloc_worklist.length() != 0) { |
duke@435 | 1089 | Node *n = alloc_worklist.pop(); |
duke@435 | 1090 | uint ni = n->_idx; |
kvn@500 | 1091 | const TypeOopPtr* tinst = NULL; |
duke@435 | 1092 | if (n->is_Call()) { |
duke@435 | 1093 | CallNode *alloc = n->as_Call(); |
duke@435 | 1094 | // copy escape information to call node |
kvn@679 | 1095 | PointsToNode* ptn = ptnode_adr(alloc->_idx); |
kvn@1989 | 1096 | PointsToNode::EscapeState es = escape_state(alloc); |
kvn@500 | 1097 | // We have an allocation or call which returns a Java object, |
kvn@500 | 1098 | // see if it is unescaped. |
kvn@3254 | 1099 | if (es != PointsToNode::NoEscape || !ptn->scalar_replaceable()) |
duke@435 | 1100 | continue; |
kvn@1219 | 1101 | |
kvn@1219 | 1102 | // Find CheckCastPP for the allocate or for the return value of a call |
kvn@1219 | 1103 | n = alloc->result_cast(); |
kvn@1219 | 1104 | if (n == NULL) { // No uses except Initialize node |
kvn@1219 | 1105 | if (alloc->is_Allocate()) { |
kvn@1219 | 1106 | // Set the scalar_replaceable flag for allocation |
kvn@1219 | 1107 | // so it could be eliminated if it has no uses. |
kvn@1219 | 1108 | alloc->as_Allocate()->_is_scalar_replaceable = true; |
kvn@1219 | 1109 | } |
kvn@1219 | 1110 | continue; |
kvn@474 | 1111 | } |
kvn@1219 | 1112 | if (!n->is_CheckCastPP()) { // not unique CheckCastPP. |
kvn@1219 | 1113 | assert(!alloc->is_Allocate(), "allocation should have unique type"); |
kvn@500 | 1114 | continue; |
kvn@1219 | 1115 | } |
kvn@1219 | 1116 | |
kvn@500 | 1117 | // The inline code for Object.clone() casts the allocation result to |
kvn@682 | 1118 | // java.lang.Object and then to the actual type of the allocated |
kvn@500 | 1119 | // object. Detect this case and use the second cast. |
kvn@682 | 1120 | // Also detect j.l.reflect.Array.newInstance(jobject, jint) case when |
kvn@682 | 1121 | // the allocation result is cast to java.lang.Object and then |
kvn@682 | 1122 | // to the actual Array type. |
kvn@500 | 1123 | if (alloc->is_Allocate() && n->as_Type()->type() == TypeInstPtr::NOTNULL |
kvn@682 | 1124 | && (alloc->is_AllocateArray() || |
kvn@682 | 1125 | igvn->type(alloc->in(AllocateNode::KlassNode)) != TypeKlassPtr::OBJECT)) { |
kvn@500 | 1126 | Node *cast2 = NULL; |
kvn@500 | 1127 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
kvn@500 | 1128 | Node *use = n->fast_out(i); |
kvn@500 | 1129 | if (use->is_CheckCastPP()) { |
kvn@500 | 1130 | cast2 = use; |
kvn@500 | 1131 | break; |
kvn@500 | 1132 | } |
kvn@500 | 1133 | } |
kvn@500 | 1134 | if (cast2 != NULL) { |
kvn@500 | 1135 | n = cast2; |
kvn@500 | 1136 | } else { |
kvn@1219 | 1137 | // Non-scalar replaceable if the allocation type is unknown statically |
kvn@1219 | 1138 | // (reflection allocation), the object can't be restored during |
kvn@1219 | 1139 | // deoptimization without precise type. |
kvn@500 | 1140 | continue; |
kvn@500 | 1141 | } |
kvn@500 | 1142 | } |
kvn@1219 | 1143 | if (alloc->is_Allocate()) { |
kvn@1219 | 1144 | // Set the scalar_replaceable flag for allocation |
kvn@1219 | 1145 | // so it could be eliminated. |
kvn@1219 | 1146 | alloc->as_Allocate()->_is_scalar_replaceable = true; |
kvn@1219 | 1147 | } |
kvn@3254 | 1148 | set_escape_state(n->_idx, es); // CheckCastPP escape state |
kvn@682 | 1149 | // in order for an object to be scalar-replaceable, it must be: |
kvn@500 | 1150 | // - a direct allocation (not a call returning an object) |
kvn@500 | 1151 | // - non-escaping |
kvn@500 | 1152 | // - eligible to be a unique type |
kvn@500 | 1153 | // - not determined to be ineligible by escape analysis |
kvn@1536 | 1154 | assert(ptnode_adr(alloc->_idx)->_node != NULL && |
kvn@1536 | 1155 | ptnode_adr(n->_idx)->_node != NULL, "should be registered"); |
duke@435 | 1156 | set_map(alloc->_idx, n); |
duke@435 | 1157 | set_map(n->_idx, alloc); |
kvn@500 | 1158 | const TypeOopPtr *t = igvn->type(n)->isa_oopptr(); |
kvn@500 | 1159 | if (t == NULL) |
kvn@3254 | 1160 | continue; // not a TypeOopPtr |
kvn@682 | 1161 | tinst = t->cast_to_exactness(true)->is_oopptr()->cast_to_instance_id(ni); |
duke@435 | 1162 | igvn->hash_delete(n); |
duke@435 | 1163 | igvn->set_type(n, tinst); |
duke@435 | 1164 | n->raise_bottom_type(tinst); |
duke@435 | 1165 | igvn->hash_insert(n); |
kvn@500 | 1166 | record_for_optimizer(n); |
kvn@3254 | 1167 | if (alloc->is_Allocate() && (t->isa_instptr() || t->isa_aryptr())) { |
kvn@598 | 1168 | |
kvn@598 | 1169 | // First, put on the worklist all Field edges from Connection Graph |
kvn@598 | 1170 | // which is more accurate then putting immediate users from Ideal Graph. |
kvn@598 | 1171 | for (uint e = 0; e < ptn->edge_count(); e++) { |
kvn@679 | 1172 | Node *use = ptnode_adr(ptn->edge_target(e))->_node; |
kvn@598 | 1173 | assert(ptn->edge_type(e) == PointsToNode::FieldEdge && use->is_AddP(), |
kvn@598 | 1174 | "only AddP nodes are Field edges in CG"); |
kvn@598 | 1175 | if (use->outcnt() > 0) { // Don't process dead nodes |
kvn@598 | 1176 | Node* addp2 = find_second_addp(use, use->in(AddPNode::Base)); |
kvn@598 | 1177 | if (addp2 != NULL) { |
kvn@598 | 1178 | assert(alloc->is_AllocateArray(),"array allocation was expected"); |
kvn@598 | 1179 | alloc_worklist.append_if_missing(addp2); |
kvn@598 | 1180 | } |
kvn@598 | 1181 | alloc_worklist.append_if_missing(use); |
kvn@598 | 1182 | } |
kvn@598 | 1183 | } |
kvn@598 | 1184 | |
kvn@500 | 1185 | // An allocation may have an Initialize which has raw stores. Scan |
kvn@500 | 1186 | // the users of the raw allocation result and push AddP users |
kvn@500 | 1187 | // on alloc_worklist. |
kvn@500 | 1188 | Node *raw_result = alloc->proj_out(TypeFunc::Parms); |
kvn@500 | 1189 | assert (raw_result != NULL, "must have an allocation result"); |
kvn@500 | 1190 | for (DUIterator_Fast imax, i = raw_result->fast_outs(imax); i < imax; i++) { |
kvn@500 | 1191 | Node *use = raw_result->fast_out(i); |
kvn@500 | 1192 | if (use->is_AddP() && use->outcnt() > 0) { // Don't process dead nodes |
kvn@500 | 1193 | Node* addp2 = find_second_addp(use, raw_result); |
kvn@500 | 1194 | if (addp2 != NULL) { |
kvn@500 | 1195 | assert(alloc->is_AllocateArray(),"array allocation was expected"); |
kvn@500 | 1196 | alloc_worklist.append_if_missing(addp2); |
kvn@500 | 1197 | } |
kvn@500 | 1198 | alloc_worklist.append_if_missing(use); |
kvn@1535 | 1199 | } else if (use->is_MemBar()) { |
kvn@500 | 1200 | memnode_worklist.append_if_missing(use); |
kvn@500 | 1201 | } |
kvn@500 | 1202 | } |
kvn@500 | 1203 | } |
duke@435 | 1204 | } else if (n->is_AddP()) { |
kvn@2556 | 1205 | VectorSet* ptset = PointsTo(get_addp_base(n)); |
kvn@2556 | 1206 | assert(ptset->Size() == 1, "AddP address is unique"); |
kvn@2556 | 1207 | uint elem = ptset->getelem(); // Allocation node's index |
kvn@1535 | 1208 | if (elem == _phantom_object) { |
kvn@1535 | 1209 | assert(false, "escaped allocation"); |
kvn@500 | 1210 | continue; // Assume the value was set outside this method. |
kvn@1535 | 1211 | } |
kvn@500 | 1212 | Node *base = get_map(elem); // CheckCastPP node |
kvn@1535 | 1213 | if (!split_AddP(n, base, igvn)) continue; // wrong type from dead path |
kvn@500 | 1214 | tinst = igvn->type(base)->isa_oopptr(); |
kvn@500 | 1215 | } else if (n->is_Phi() || |
kvn@500 | 1216 | n->is_CheckCastPP() || |
kvn@603 | 1217 | n->is_EncodeP() || |
kvn@603 | 1218 | n->is_DecodeN() || |
kvn@500 | 1219 | (n->is_ConstraintCast() && n->Opcode() == Op_CastPP)) { |
duke@435 | 1220 | if (visited.test_set(n->_idx)) { |
duke@435 | 1221 | assert(n->is_Phi(), "loops only through Phi's"); |
duke@435 | 1222 | continue; // already processed |
duke@435 | 1223 | } |
kvn@2556 | 1224 | VectorSet* ptset = PointsTo(n); |
kvn@2556 | 1225 | if (ptset->Size() == 1) { |
kvn@2556 | 1226 | uint elem = ptset->getelem(); // Allocation node's index |
kvn@1535 | 1227 | if (elem == _phantom_object) { |
kvn@1535 | 1228 | assert(false, "escaped allocation"); |
kvn@500 | 1229 | continue; // Assume the value was set outside this method. |
kvn@1535 | 1230 | } |
kvn@500 | 1231 | Node *val = get_map(elem); // CheckCastPP node |
duke@435 | 1232 | TypeNode *tn = n->as_Type(); |
kvn@500 | 1233 | tinst = igvn->type(val)->isa_oopptr(); |
kvn@658 | 1234 | assert(tinst != NULL && tinst->is_known_instance() && |
kvn@658 | 1235 | (uint)tinst->instance_id() == elem , "instance type expected."); |
kvn@598 | 1236 | |
kvn@598 | 1237 | const Type *tn_type = igvn->type(tn); |
kvn@658 | 1238 | const TypeOopPtr *tn_t; |
kvn@658 | 1239 | if (tn_type->isa_narrowoop()) { |
kvn@658 | 1240 | tn_t = tn_type->make_ptr()->isa_oopptr(); |
kvn@658 | 1241 | } else { |
kvn@658 | 1242 | tn_t = tn_type->isa_oopptr(); |
kvn@658 | 1243 | } |
duke@435 | 1244 | |
kvn@1535 | 1245 | if (tn_t != NULL && tinst->klass()->is_subtype_of(tn_t->klass())) { |
kvn@598 | 1246 | if (tn_type->isa_narrowoop()) { |
kvn@598 | 1247 | tn_type = tinst->make_narrowoop(); |
kvn@598 | 1248 | } else { |
kvn@598 | 1249 | tn_type = tinst; |
kvn@598 | 1250 | } |
duke@435 | 1251 | igvn->hash_delete(tn); |
kvn@598 | 1252 | igvn->set_type(tn, tn_type); |
kvn@598 | 1253 | tn->set_type(tn_type); |
duke@435 | 1254 | igvn->hash_insert(tn); |
kvn@500 | 1255 | record_for_optimizer(n); |
kvn@728 | 1256 | } else { |
kvn@1535 | 1257 | assert(tn_type == TypePtr::NULL_PTR || |
kvn@1535 | 1258 | tn_t != NULL && !tinst->klass()->is_subtype_of(tn_t->klass()), |
kvn@1535 | 1259 | "unexpected type"); |
kvn@1535 | 1260 | continue; // Skip dead path with different type |
duke@435 | 1261 | } |
duke@435 | 1262 | } |
duke@435 | 1263 | } else { |
kvn@1535 | 1264 | debug_only(n->dump();) |
kvn@1535 | 1265 | assert(false, "EA: unexpected node"); |
duke@435 | 1266 | continue; |
duke@435 | 1267 | } |
kvn@1535 | 1268 | // push allocation's users on appropriate worklist |
duke@435 | 1269 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
duke@435 | 1270 | Node *use = n->fast_out(i); |
duke@435 | 1271 | if(use->is_Mem() && use->in(MemNode::Address) == n) { |
kvn@1535 | 1272 | // Load/store to instance's field |
kvn@500 | 1273 | memnode_worklist.append_if_missing(use); |
kvn@1535 | 1274 | } else if (use->is_MemBar()) { |
kvn@500 | 1275 | memnode_worklist.append_if_missing(use); |
kvn@500 | 1276 | } else if (use->is_AddP() && use->outcnt() > 0) { // No dead nodes |
kvn@500 | 1277 | Node* addp2 = find_second_addp(use, n); |
kvn@500 | 1278 | if (addp2 != NULL) { |
kvn@500 | 1279 | alloc_worklist.append_if_missing(addp2); |
kvn@500 | 1280 | } |
kvn@500 | 1281 | alloc_worklist.append_if_missing(use); |
kvn@500 | 1282 | } else if (use->is_Phi() || |
kvn@500 | 1283 | use->is_CheckCastPP() || |
kvn@603 | 1284 | use->is_EncodeP() || |
kvn@603 | 1285 | use->is_DecodeN() || |
kvn@500 | 1286 | (use->is_ConstraintCast() && use->Opcode() == Op_CastPP)) { |
kvn@500 | 1287 | alloc_worklist.append_if_missing(use); |
kvn@1535 | 1288 | #ifdef ASSERT |
kvn@1535 | 1289 | } else if (use->is_Mem()) { |
kvn@1535 | 1290 | assert(use->in(MemNode::Address) != n, "EA: missing allocation reference path"); |
kvn@1535 | 1291 | } else if (use->is_MergeMem()) { |
kvn@1535 | 1292 | assert(_mergemem_worklist.contains(use->as_MergeMem()), "EA: missing MergeMem node in the worklist"); |
kvn@1535 | 1293 | } else if (use->is_SafePoint()) { |
kvn@1535 | 1294 | // Look for MergeMem nodes for calls which reference unique allocation |
kvn@1535 | 1295 | // (through CheckCastPP nodes) even for debug info. |
kvn@1535 | 1296 | Node* m = use->in(TypeFunc::Memory); |
kvn@1535 | 1297 | if (m->is_MergeMem()) { |
kvn@1535 | 1298 | assert(_mergemem_worklist.contains(m->as_MergeMem()), "EA: missing MergeMem node in the worklist"); |
kvn@1535 | 1299 | } |
kvn@1535 | 1300 | } else { |
kvn@1535 | 1301 | uint op = use->Opcode(); |
kvn@1535 | 1302 | if (!(op == Op_CmpP || op == Op_Conv2B || |
kvn@1535 | 1303 | op == Op_CastP2X || op == Op_StoreCM || |
kvn@1535 | 1304 | op == Op_FastLock || op == Op_AryEq || op == Op_StrComp || |
kvn@1535 | 1305 | op == Op_StrEquals || op == Op_StrIndexOf)) { |
kvn@1535 | 1306 | n->dump(); |
kvn@1535 | 1307 | use->dump(); |
kvn@1535 | 1308 | assert(false, "EA: missing allocation reference path"); |
kvn@1535 | 1309 | } |
kvn@1535 | 1310 | #endif |
duke@435 | 1311 | } |
duke@435 | 1312 | } |
duke@435 | 1313 | |
duke@435 | 1314 | } |
kvn@500 | 1315 | // New alias types were created in split_AddP(). |
duke@435 | 1316 | uint new_index_end = (uint) _compile->num_alias_types(); |
duke@435 | 1317 | |
duke@435 | 1318 | // Phase 2: Process MemNode's from memnode_worklist. compute new address type and |
duke@435 | 1319 | // compute new values for Memory inputs (the Memory inputs are not |
duke@435 | 1320 | // actually updated until phase 4.) |
duke@435 | 1321 | if (memnode_worklist.length() == 0) |
duke@435 | 1322 | return; // nothing to do |
duke@435 | 1323 | |
duke@435 | 1324 | while (memnode_worklist.length() != 0) { |
duke@435 | 1325 | Node *n = memnode_worklist.pop(); |
kvn@500 | 1326 | if (visited.test_set(n->_idx)) |
kvn@500 | 1327 | continue; |
kvn@1535 | 1328 | if (n->is_Phi() || n->is_ClearArray()) { |
kvn@1535 | 1329 | // we don't need to do anything, but the users must be pushed |
kvn@1535 | 1330 | } else if (n->is_MemBar()) { // Initialize, MemBar nodes |
kvn@1535 | 1331 | // we don't need to do anything, but the users must be pushed |
kvn@1535 | 1332 | n = n->as_MemBar()->proj_out(TypeFunc::Memory); |
kvn@500 | 1333 | if (n == NULL) |
duke@435 | 1334 | continue; |
duke@435 | 1335 | } else { |
duke@435 | 1336 | assert(n->is_Mem(), "memory node required."); |
duke@435 | 1337 | Node *addr = n->in(MemNode::Address); |
duke@435 | 1338 | const Type *addr_t = igvn->type(addr); |
duke@435 | 1339 | if (addr_t == Type::TOP) |
duke@435 | 1340 | continue; |
duke@435 | 1341 | assert (addr_t->isa_ptr() != NULL, "pointer type required."); |
duke@435 | 1342 | int alias_idx = _compile->get_alias_index(addr_t->is_ptr()); |
kvn@500 | 1343 | assert ((uint)alias_idx < new_index_end, "wrong alias index"); |
kvn@500 | 1344 | Node *mem = find_inst_mem(n->in(MemNode::Memory), alias_idx, orig_phis, igvn); |
kvn@473 | 1345 | if (_compile->failing()) { |
kvn@473 | 1346 | return; |
kvn@473 | 1347 | } |
kvn@500 | 1348 | if (mem != n->in(MemNode::Memory)) { |
kvn@1536 | 1349 | // We delay the memory edge update since we need old one in |
kvn@1536 | 1350 | // MergeMem code below when instances memory slices are separated. |
kvn@1536 | 1351 | debug_only(Node* pn = ptnode_adr(n->_idx)->_node;) |
kvn@1536 | 1352 | assert(pn == NULL || pn == n, "wrong node"); |
duke@435 | 1353 | set_map(n->_idx, mem); |
kvn@679 | 1354 | ptnode_adr(n->_idx)->_node = n; |
kvn@500 | 1355 | } |
duke@435 | 1356 | if (n->is_Load()) { |
duke@435 | 1357 | continue; // don't push users |
duke@435 | 1358 | } else if (n->is_LoadStore()) { |
duke@435 | 1359 | // get the memory projection |
duke@435 | 1360 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
duke@435 | 1361 | Node *use = n->fast_out(i); |
duke@435 | 1362 | if (use->Opcode() == Op_SCMemProj) { |
duke@435 | 1363 | n = use; |
duke@435 | 1364 | break; |
duke@435 | 1365 | } |
duke@435 | 1366 | } |
duke@435 | 1367 | assert(n->Opcode() == Op_SCMemProj, "memory projection required"); |
duke@435 | 1368 | } |
duke@435 | 1369 | } |
duke@435 | 1370 | // push user on appropriate worklist |
duke@435 | 1371 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
duke@435 | 1372 | Node *use = n->fast_out(i); |
kvn@1535 | 1373 | if (use->is_Phi() || use->is_ClearArray()) { |
kvn@500 | 1374 | memnode_worklist.append_if_missing(use); |
duke@435 | 1375 | } else if(use->is_Mem() && use->in(MemNode::Memory) == n) { |
kvn@1535 | 1376 | if (use->Opcode() == Op_StoreCM) // Ignore cardmark stores |
kvn@1535 | 1377 | continue; |
kvn@500 | 1378 | memnode_worklist.append_if_missing(use); |
kvn@1535 | 1379 | } else if (use->is_MemBar()) { |
kvn@500 | 1380 | memnode_worklist.append_if_missing(use); |
kvn@1535 | 1381 | #ifdef ASSERT |
kvn@1535 | 1382 | } else if(use->is_Mem()) { |
kvn@1535 | 1383 | assert(use->in(MemNode::Memory) != n, "EA: missing memory path"); |
duke@435 | 1384 | } else if (use->is_MergeMem()) { |
kvn@1535 | 1385 | assert(_mergemem_worklist.contains(use->as_MergeMem()), "EA: missing MergeMem node in the worklist"); |
kvn@1535 | 1386 | } else { |
kvn@1535 | 1387 | uint op = use->Opcode(); |
kvn@1535 | 1388 | if (!(op == Op_StoreCM || |
kvn@1535 | 1389 | (op == Op_CallLeaf && use->as_CallLeaf()->_name != NULL && |
kvn@1535 | 1390 | strcmp(use->as_CallLeaf()->_name, "g1_wb_pre") == 0) || |
kvn@1535 | 1391 | op == Op_AryEq || op == Op_StrComp || |
kvn@1535 | 1392 | op == Op_StrEquals || op == Op_StrIndexOf)) { |
kvn@1535 | 1393 | n->dump(); |
kvn@1535 | 1394 | use->dump(); |
kvn@1535 | 1395 | assert(false, "EA: missing memory path"); |
kvn@1535 | 1396 | } |
kvn@1535 | 1397 | #endif |
duke@435 | 1398 | } |
duke@435 | 1399 | } |
duke@435 | 1400 | } |
duke@435 | 1401 | |
kvn@500 | 1402 | // Phase 3: Process MergeMem nodes from mergemem_worklist. |
kvn@1535 | 1403 | // Walk each memory slice moving the first node encountered of each |
kvn@500 | 1404 | // instance type to the the input corresponding to its alias index. |
kvn@1535 | 1405 | uint length = _mergemem_worklist.length(); |
kvn@1535 | 1406 | for( uint next = 0; next < length; ++next ) { |
kvn@1535 | 1407 | MergeMemNode* nmm = _mergemem_worklist.at(next); |
kvn@1535 | 1408 | assert(!visited.test_set(nmm->_idx), "should not be visited before"); |
duke@435 | 1409 | // Note: we don't want to use MergeMemStream here because we only want to |
kvn@1535 | 1410 | // scan inputs which exist at the start, not ones we add during processing. |
kvn@1535 | 1411 | // Note 2: MergeMem may already contains instance memory slices added |
kvn@1535 | 1412 | // during find_inst_mem() call when memory nodes were processed above. |
kvn@1535 | 1413 | igvn->hash_delete(nmm); |
duke@435 | 1414 | uint nslices = nmm->req(); |
duke@435 | 1415 | for (uint i = Compile::AliasIdxRaw+1; i < nslices; i++) { |
kvn@500 | 1416 | Node* mem = nmm->in(i); |
kvn@500 | 1417 | Node* cur = NULL; |
duke@435 | 1418 | if (mem == NULL || mem->is_top()) |
duke@435 | 1419 | continue; |
kvn@1536 | 1420 | // First, update mergemem by moving memory nodes to corresponding slices |
kvn@1536 | 1421 | // if their type became more precise since this mergemem was created. |
duke@435 | 1422 | while (mem->is_Mem()) { |
duke@435 | 1423 | const Type *at = igvn->type(mem->in(MemNode::Address)); |
duke@435 | 1424 | if (at != Type::TOP) { |
duke@435 | 1425 | assert (at->isa_ptr() != NULL, "pointer type required."); |
duke@435 | 1426 | uint idx = (uint)_compile->get_alias_index(at->is_ptr()); |
duke@435 | 1427 | if (idx == i) { |
duke@435 | 1428 | if (cur == NULL) |
duke@435 | 1429 | cur = mem; |
duke@435 | 1430 | } else { |
duke@435 | 1431 | if (idx >= nmm->req() || nmm->is_empty_memory(nmm->in(idx))) { |
duke@435 | 1432 | nmm->set_memory_at(idx, mem); |
duke@435 | 1433 | } |
duke@435 | 1434 | } |
duke@435 | 1435 | } |
duke@435 | 1436 | mem = mem->in(MemNode::Memory); |
duke@435 | 1437 | } |
duke@435 | 1438 | nmm->set_memory_at(i, (cur != NULL) ? cur : mem); |
kvn@500 | 1439 | // Find any instance of the current type if we haven't encountered |
kvn@1536 | 1440 | // already a memory slice of the instance along the memory chain. |
kvn@500 | 1441 | for (uint ni = new_index_start; ni < new_index_end; ni++) { |
kvn@500 | 1442 | if((uint)_compile->get_general_index(ni) == i) { |
kvn@500 | 1443 | Node *m = (ni >= nmm->req()) ? nmm->empty_memory() : nmm->in(ni); |
kvn@500 | 1444 | if (nmm->is_empty_memory(m)) { |
kvn@500 | 1445 | Node* result = find_inst_mem(mem, ni, orig_phis, igvn); |
kvn@500 | 1446 | if (_compile->failing()) { |
kvn@500 | 1447 | return; |
kvn@500 | 1448 | } |
kvn@500 | 1449 | nmm->set_memory_at(ni, result); |
kvn@500 | 1450 | } |
kvn@500 | 1451 | } |
kvn@500 | 1452 | } |
kvn@500 | 1453 | } |
kvn@500 | 1454 | // Find the rest of instances values |
kvn@500 | 1455 | for (uint ni = new_index_start; ni < new_index_end; ni++) { |
kvn@1536 | 1456 | const TypeOopPtr *tinst = _compile->get_adr_type(ni)->isa_oopptr(); |
kvn@500 | 1457 | Node* result = step_through_mergemem(nmm, ni, tinst); |
kvn@500 | 1458 | if (result == nmm->base_memory()) { |
kvn@500 | 1459 | // Didn't find instance memory, search through general slice recursively. |
kvn@1536 | 1460 | result = nmm->memory_at(_compile->get_general_index(ni)); |
kvn@500 | 1461 | result = find_inst_mem(result, ni, orig_phis, igvn); |
kvn@500 | 1462 | if (_compile->failing()) { |
kvn@500 | 1463 | return; |
kvn@500 | 1464 | } |
kvn@500 | 1465 | nmm->set_memory_at(ni, result); |
kvn@500 | 1466 | } |
kvn@500 | 1467 | } |
kvn@500 | 1468 | igvn->hash_insert(nmm); |
kvn@500 | 1469 | record_for_optimizer(nmm); |
duke@435 | 1470 | } |
duke@435 | 1471 | |
kvn@500 | 1472 | // Phase 4: Update the inputs of non-instance memory Phis and |
kvn@500 | 1473 | // the Memory input of memnodes |
duke@435 | 1474 | // First update the inputs of any non-instance Phi's from |
duke@435 | 1475 | // which we split out an instance Phi. Note we don't have |
duke@435 | 1476 | // to recursively process Phi's encounted on the input memory |
duke@435 | 1477 | // chains as is done in split_memory_phi() since they will |
duke@435 | 1478 | // also be processed here. |
kvn@682 | 1479 | for (int j = 0; j < orig_phis.length(); j++) { |
kvn@682 | 1480 | PhiNode *phi = orig_phis.at(j); |
duke@435 | 1481 | int alias_idx = _compile->get_alias_index(phi->adr_type()); |
duke@435 | 1482 | igvn->hash_delete(phi); |
duke@435 | 1483 | for (uint i = 1; i < phi->req(); i++) { |
duke@435 | 1484 | Node *mem = phi->in(i); |
kvn@500 | 1485 | Node *new_mem = find_inst_mem(mem, alias_idx, orig_phis, igvn); |
kvn@500 | 1486 | if (_compile->failing()) { |
kvn@500 | 1487 | return; |
kvn@500 | 1488 | } |
duke@435 | 1489 | if (mem != new_mem) { |
duke@435 | 1490 | phi->set_req(i, new_mem); |
duke@435 | 1491 | } |
duke@435 | 1492 | } |
duke@435 | 1493 | igvn->hash_insert(phi); |
duke@435 | 1494 | record_for_optimizer(phi); |
duke@435 | 1495 | } |
duke@435 | 1496 | |
duke@435 | 1497 | // Update the memory inputs of MemNodes with the value we computed |
kvn@1536 | 1498 | // in Phase 2 and move stores memory users to corresponding memory slices. |
kvn@2810 | 1499 | |
kvn@2810 | 1500 | // Disable memory split verification code until the fix for 6984348. |
kvn@2810 | 1501 | // Currently it produces false negative results since it does not cover all cases. |
kvn@2810 | 1502 | #if 0 // ifdef ASSERT |
kvn@2556 | 1503 | visited.Reset(); |
kvn@1536 | 1504 | Node_Stack old_mems(arena, _compile->unique() >> 2); |
kvn@1536 | 1505 | #endif |
kvn@679 | 1506 | for (uint i = 0; i < nodes_size(); i++) { |
duke@435 | 1507 | Node *nmem = get_map(i); |
duke@435 | 1508 | if (nmem != NULL) { |
kvn@679 | 1509 | Node *n = ptnode_adr(i)->_node; |
kvn@1536 | 1510 | assert(n != NULL, "sanity"); |
kvn@1536 | 1511 | if (n->is_Mem()) { |
kvn@2810 | 1512 | #if 0 // ifdef ASSERT |
kvn@1536 | 1513 | Node* old_mem = n->in(MemNode::Memory); |
kvn@1536 | 1514 | if (!visited.test_set(old_mem->_idx)) { |
kvn@1536 | 1515 | old_mems.push(old_mem, old_mem->outcnt()); |
kvn@1536 | 1516 | } |
kvn@1536 | 1517 | #endif |
kvn@1536 | 1518 | assert(n->in(MemNode::Memory) != nmem, "sanity"); |
kvn@1536 | 1519 | if (!n->is_Load()) { |
kvn@1536 | 1520 | // Move memory users of a store first. |
kvn@1536 | 1521 | move_inst_mem(n, orig_phis, igvn); |
kvn@1536 | 1522 | } |
kvn@1536 | 1523 | // Now update memory input |
duke@435 | 1524 | igvn->hash_delete(n); |
duke@435 | 1525 | n->set_req(MemNode::Memory, nmem); |
duke@435 | 1526 | igvn->hash_insert(n); |
duke@435 | 1527 | record_for_optimizer(n); |
kvn@1536 | 1528 | } else { |
kvn@1536 | 1529 | assert(n->is_Allocate() || n->is_CheckCastPP() || |
kvn@1536 | 1530 | n->is_AddP() || n->is_Phi(), "unknown node used for set_map()"); |
duke@435 | 1531 | } |
duke@435 | 1532 | } |
duke@435 | 1533 | } |
kvn@2810 | 1534 | #if 0 // ifdef ASSERT |
kvn@1536 | 1535 | // Verify that memory was split correctly |
kvn@1536 | 1536 | while (old_mems.is_nonempty()) { |
kvn@1536 | 1537 | Node* old_mem = old_mems.node(); |
kvn@1536 | 1538 | uint old_cnt = old_mems.index(); |
kvn@1536 | 1539 | old_mems.pop(); |
kvn@2810 | 1540 | assert(old_cnt == old_mem->outcnt(), "old mem could be lost"); |
kvn@1536 | 1541 | } |
kvn@1536 | 1542 | #endif |
duke@435 | 1543 | } |
duke@435 | 1544 | |
kvn@679 | 1545 | bool ConnectionGraph::has_candidates(Compile *C) { |
kvn@679 | 1546 | // EA brings benefits only when the code has allocations and/or locks which |
kvn@679 | 1547 | // are represented by ideal Macro nodes. |
kvn@679 | 1548 | int cnt = C->macro_count(); |
kvn@679 | 1549 | for( int i=0; i < cnt; i++ ) { |
kvn@679 | 1550 | Node *n = C->macro_node(i); |
kvn@679 | 1551 | if ( n->is_Allocate() ) |
kvn@679 | 1552 | return true; |
kvn@679 | 1553 | if( n->is_Lock() ) { |
kvn@679 | 1554 | Node* obj = n->as_Lock()->obj_node()->uncast(); |
kvn@679 | 1555 | if( !(obj->is_Parm() || obj->is_Con()) ) |
kvn@679 | 1556 | return true; |
kvn@679 | 1557 | } |
kvn@679 | 1558 | } |
kvn@679 | 1559 | return false; |
kvn@679 | 1560 | } |
kvn@679 | 1561 | |
kvn@1989 | 1562 | void ConnectionGraph::do_analysis(Compile *C, PhaseIterGVN *igvn) { |
kvn@1989 | 1563 | // Add ConP#NULL and ConN#NULL nodes before ConnectionGraph construction |
kvn@1989 | 1564 | // to create space for them in ConnectionGraph::_nodes[]. |
kvn@1989 | 1565 | Node* oop_null = igvn->zerocon(T_OBJECT); |
kvn@1989 | 1566 | Node* noop_null = igvn->zerocon(T_NARROWOOP); |
kvn@1989 | 1567 | |
kvn@1989 | 1568 | ConnectionGraph* congraph = new(C->comp_arena()) ConnectionGraph(C, igvn); |
kvn@1989 | 1569 | // Perform escape analysis |
kvn@1989 | 1570 | if (congraph->compute_escape()) { |
kvn@1989 | 1571 | // There are non escaping objects. |
kvn@1989 | 1572 | C->set_congraph(congraph); |
kvn@1989 | 1573 | } |
kvn@1989 | 1574 | |
kvn@1989 | 1575 | // Cleanup. |
kvn@1989 | 1576 | if (oop_null->outcnt() == 0) |
kvn@1989 | 1577 | igvn->hash_delete(oop_null); |
kvn@1989 | 1578 | if (noop_null->outcnt() == 0) |
kvn@1989 | 1579 | igvn->hash_delete(noop_null); |
kvn@1989 | 1580 | } |
kvn@1989 | 1581 | |
kvn@679 | 1582 | bool ConnectionGraph::compute_escape() { |
kvn@679 | 1583 | Compile* C = _compile; |
duke@435 | 1584 | |
kvn@598 | 1585 | // 1. Populate Connection Graph (CG) with Ideal nodes. |
duke@435 | 1586 | |
kvn@500 | 1587 | Unique_Node_List worklist_init; |
kvn@679 | 1588 | worklist_init.map(C->unique(), NULL); // preallocate space |
kvn@500 | 1589 | |
kvn@500 | 1590 | // Initialize worklist |
kvn@679 | 1591 | if (C->root() != NULL) { |
kvn@679 | 1592 | worklist_init.push(C->root()); |
kvn@500 | 1593 | } |
kvn@500 | 1594 | |
kvn@3254 | 1595 | GrowableArray<Node*> alloc_worklist; |
kvn@3254 | 1596 | GrowableArray<Node*> addp_worklist; |
kvn@3309 | 1597 | GrowableArray<Node*> ptr_cmp_worklist; |
roland@3392 | 1598 | GrowableArray<Node*> storestore_worklist; |
kvn@1989 | 1599 | PhaseGVN* igvn = _igvn; |
kvn@500 | 1600 | |
kvn@500 | 1601 | // Push all useful nodes onto CG list and set their type. |
kvn@500 | 1602 | for( uint next = 0; next < worklist_init.size(); ++next ) { |
kvn@500 | 1603 | Node* n = worklist_init.at(next); |
kvn@500 | 1604 | record_for_escape_analysis(n, igvn); |
kvn@679 | 1605 | // Only allocations and java static calls results are checked |
kvn@679 | 1606 | // for an escape status. See process_call_result() below. |
kvn@679 | 1607 | if (n->is_Allocate() || n->is_CallStaticJava() && |
kvn@679 | 1608 | ptnode_adr(n->_idx)->node_type() == PointsToNode::JavaObject) { |
kvn@3318 | 1609 | alloc_worklist.append(n); |
kvn@3309 | 1610 | } else if(n->is_AddP()) { |
kvn@2276 | 1611 | // Collect address nodes. Use them during stage 3 below |
kvn@2276 | 1612 | // to build initial connection graph field edges. |
kvn@3254 | 1613 | addp_worklist.append(n); |
kvn@1535 | 1614 | } else if (n->is_MergeMem()) { |
kvn@1535 | 1615 | // Collect all MergeMem nodes to add memory slices for |
kvn@1535 | 1616 | // scalar replaceable objects in split_unique_types(). |
kvn@1535 | 1617 | _mergemem_worklist.append(n->as_MergeMem()); |
kvn@3309 | 1618 | } else if (OptimizePtrCompare && n->is_Cmp() && |
kvn@3309 | 1619 | (n->Opcode() == Op_CmpP || n->Opcode() == Op_CmpN)) { |
kvn@3309 | 1620 | // Compare pointers nodes |
kvn@3309 | 1621 | ptr_cmp_worklist.append(n); |
roland@3392 | 1622 | } else if (n->is_MemBarStoreStore()) { |
roland@3392 | 1623 | // Collect all MemBarStoreStore nodes so that depending on the |
roland@3392 | 1624 | // escape status of the associated Allocate node some of them |
roland@3392 | 1625 | // may be eliminated. |
roland@3392 | 1626 | storestore_worklist.append(n); |
kvn@1535 | 1627 | } |
kvn@500 | 1628 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
kvn@500 | 1629 | Node* m = n->fast_out(i); // Get user |
kvn@500 | 1630 | worklist_init.push(m); |
kvn@500 | 1631 | } |
kvn@500 | 1632 | } |
kvn@500 | 1633 | |
kvn@3318 | 1634 | if (alloc_worklist.length() == 0) { |
kvn@500 | 1635 | _collecting = false; |
kvn@679 | 1636 | return false; // Nothing to do. |
kvn@500 | 1637 | } |
kvn@500 | 1638 | |
kvn@500 | 1639 | // 2. First pass to create simple CG edges (doesn't require to walk CG). |
kvn@679 | 1640 | uint delayed_size = _delayed_worklist.size(); |
kvn@679 | 1641 | for( uint next = 0; next < delayed_size; ++next ) { |
kvn@500 | 1642 | Node* n = _delayed_worklist.at(next); |
kvn@500 | 1643 | build_connection_graph(n, igvn); |
kvn@500 | 1644 | } |
kvn@500 | 1645 | |
kvn@2276 | 1646 | // 3. Pass to create initial fields edges (JavaObject -F-> AddP) |
kvn@2276 | 1647 | // to reduce number of iterations during stage 4 below. |
kvn@3254 | 1648 | uint addp_length = addp_worklist.length(); |
kvn@3254 | 1649 | for( uint next = 0; next < addp_length; ++next ) { |
kvn@3254 | 1650 | Node* n = addp_worklist.at(next); |
kvn@2276 | 1651 | Node* base = get_addp_base(n); |
kvn@3309 | 1652 | if (base->is_Proj() && base->in(0)->is_Call()) |
kvn@2276 | 1653 | base = base->in(0); |
kvn@2276 | 1654 | PointsToNode::NodeType nt = ptnode_adr(base->_idx)->node_type(); |
kvn@2276 | 1655 | if (nt == PointsToNode::JavaObject) { |
kvn@2276 | 1656 | build_connection_graph(n, igvn); |
kvn@2276 | 1657 | } |
kvn@500 | 1658 | } |
kvn@500 | 1659 | |
kvn@3254 | 1660 | GrowableArray<int> cg_worklist; |
kvn@500 | 1661 | cg_worklist.append(_phantom_object); |
kvn@2276 | 1662 | GrowableArray<uint> worklist; |
kvn@500 | 1663 | |
kvn@500 | 1664 | // 4. Build Connection Graph which need |
kvn@500 | 1665 | // to walk the connection graph. |
kvn@2276 | 1666 | _progress = false; |
kvn@679 | 1667 | for (uint ni = 0; ni < nodes_size(); ni++) { |
kvn@679 | 1668 | PointsToNode* ptn = ptnode_adr(ni); |
kvn@500 | 1669 | Node *n = ptn->_node; |
kvn@500 | 1670 | if (n != NULL) { // Call, AddP, LoadP, StoreP |
kvn@500 | 1671 | build_connection_graph(n, igvn); |
kvn@500 | 1672 | if (ptn->node_type() != PointsToNode::UnknownType) |
kvn@500 | 1673 | cg_worklist.append(n->_idx); // Collect CG nodes |
kvn@2276 | 1674 | if (!_processed.test(n->_idx)) |
kvn@2276 | 1675 | worklist.append(n->_idx); // Collect C/A/L/S nodes |
kvn@500 | 1676 | } |
duke@435 | 1677 | } |
duke@435 | 1678 | |
kvn@2276 | 1679 | // After IGVN user nodes may have smaller _idx than |
kvn@2276 | 1680 | // their inputs so they will be processed first in |
kvn@2276 | 1681 | // previous loop. Because of that not all Graph |
kvn@2276 | 1682 | // edges will be created. Walk over interesting |
kvn@2276 | 1683 | // nodes again until no new edges are created. |
kvn@2276 | 1684 | // |
kvn@2276 | 1685 | // Normally only 1-3 passes needed to build |
kvn@2276 | 1686 | // Connection Graph depending on graph complexity. |
kvn@2409 | 1687 | // Observed 8 passes in jvm2008 compiler.compiler. |
kvn@2409 | 1688 | // Set limit to 20 to catch situation when something |
kvn@2276 | 1689 | // did go wrong and recompile the method without EA. |
kvn@2276 | 1690 | |
kvn@2409 | 1691 | #define CG_BUILD_ITER_LIMIT 20 |
kvn@2276 | 1692 | |
kvn@2276 | 1693 | uint length = worklist.length(); |
kvn@2276 | 1694 | int iterations = 0; |
kvn@2276 | 1695 | while(_progress && (iterations++ < CG_BUILD_ITER_LIMIT)) { |
kvn@2276 | 1696 | _progress = false; |
kvn@2276 | 1697 | for( uint next = 0; next < length; ++next ) { |
kvn@2276 | 1698 | int ni = worklist.at(next); |
kvn@2276 | 1699 | PointsToNode* ptn = ptnode_adr(ni); |
kvn@2276 | 1700 | Node* n = ptn->_node; |
kvn@2276 | 1701 | assert(n != NULL, "should be known node"); |
kvn@2276 | 1702 | build_connection_graph(n, igvn); |
kvn@2276 | 1703 | } |
kvn@2276 | 1704 | } |
kvn@2276 | 1705 | if (iterations >= CG_BUILD_ITER_LIMIT) { |
kvn@2276 | 1706 | assert(iterations < CG_BUILD_ITER_LIMIT, |
kvn@2276 | 1707 | err_msg("infinite EA connection graph build with %d nodes and worklist size %d", |
kvn@2276 | 1708 | nodes_size(), length)); |
kvn@2276 | 1709 | // Possible infinite build_connection_graph loop, |
kvn@2276 | 1710 | // retry compilation without escape analysis. |
kvn@2276 | 1711 | C->record_failure(C2Compiler::retry_no_escape_analysis()); |
kvn@2276 | 1712 | _collecting = false; |
kvn@2276 | 1713 | return false; |
kvn@2276 | 1714 | } |
kvn@2276 | 1715 | #undef CG_BUILD_ITER_LIMIT |
kvn@2276 | 1716 | |
kvn@3318 | 1717 | // 5. Propagate escaped states. |
kvn@3318 | 1718 | worklist.clear(); |
kvn@3318 | 1719 | |
kvn@3318 | 1720 | // mark all nodes reachable from GlobalEscape nodes |
kvn@3318 | 1721 | (void)propagate_escape_state(&cg_worklist, &worklist, PointsToNode::GlobalEscape); |
kvn@3318 | 1722 | |
kvn@3318 | 1723 | // mark all nodes reachable from ArgEscape nodes |
kvn@3318 | 1724 | bool has_non_escaping_obj = propagate_escape_state(&cg_worklist, &worklist, PointsToNode::ArgEscape); |
kvn@3318 | 1725 | |
kvn@1535 | 1726 | Arena* arena = Thread::current()->resource_area(); |
kvn@1535 | 1727 | VectorSet visited(arena); |
kvn@3254 | 1728 | |
kvn@3318 | 1729 | // 6. Find fields initializing values for not escaped allocations |
kvn@3254 | 1730 | uint alloc_length = alloc_worklist.length(); |
kvn@3254 | 1731 | for (uint next = 0; next < alloc_length; ++next) { |
kvn@3254 | 1732 | Node* n = alloc_worklist.at(next); |
roland@3392 | 1733 | PointsToNode::EscapeState es = ptnode_adr(n->_idx)->escape_state(); |
roland@3392 | 1734 | if (es == PointsToNode::NoEscape) { |
kvn@3318 | 1735 | has_non_escaping_obj = true; |
kvn@3318 | 1736 | if (n->is_Allocate()) { |
kvn@3318 | 1737 | find_init_values(n, &visited, igvn); |
roland@3392 | 1738 | // The object allocated by this Allocate node will never be |
roland@3392 | 1739 | // seen by an other thread. Mark it so that when it is |
roland@3392 | 1740 | // expanded no MemBarStoreStore is added. |
roland@3392 | 1741 | n->as_Allocate()->initialization()->set_does_not_escape(); |
kvn@3318 | 1742 | } |
roland@3392 | 1743 | } else if ((es == PointsToNode::ArgEscape) && n->is_Allocate()) { |
roland@3392 | 1744 | // Same as above. Mark this Allocate node so that when it is |
roland@3392 | 1745 | // expanded no MemBarStoreStore is added. |
roland@3392 | 1746 | n->as_Allocate()->initialization()->set_does_not_escape(); |
kvn@3254 | 1747 | } |
kvn@3254 | 1748 | } |
kvn@3254 | 1749 | |
kvn@3318 | 1750 | uint cg_length = cg_worklist.length(); |
duke@435 | 1751 | |
kvn@3318 | 1752 | // Skip the rest of code if all objects escaped. |
kvn@3318 | 1753 | if (!has_non_escaping_obj) { |
kvn@3318 | 1754 | cg_length = 0; |
kvn@3318 | 1755 | addp_length = 0; |
kvn@3318 | 1756 | } |
kvn@3318 | 1757 | |
kvn@3318 | 1758 | for (uint next = 0; next < cg_length; ++next) { |
kvn@3318 | 1759 | int ni = cg_worklist.at(next); |
kvn@3318 | 1760 | PointsToNode* ptn = ptnode_adr(ni); |
kvn@3318 | 1761 | PointsToNode::NodeType nt = ptn->node_type(); |
kvn@3318 | 1762 | if (nt == PointsToNode::LocalVar || nt == PointsToNode::Field) { |
kvn@3318 | 1763 | if (ptn->edge_count() == 0) { |
kvn@3318 | 1764 | // No values were found. Assume the value was set |
kvn@3318 | 1765 | // outside this method - add edge to phantom object. |
kvn@3318 | 1766 | add_pointsto_edge(ni, _phantom_object); |
kvn@3318 | 1767 | } |
kvn@3318 | 1768 | } |
kvn@3318 | 1769 | } |
kvn@3318 | 1770 | |
kvn@3318 | 1771 | // 7. Remove deferred edges from the graph. |
kvn@3254 | 1772 | for (uint next = 0; next < cg_length; ++next) { |
kvn@500 | 1773 | int ni = cg_worklist.at(next); |
kvn@679 | 1774 | PointsToNode* ptn = ptnode_adr(ni); |
duke@435 | 1775 | PointsToNode::NodeType nt = ptn->node_type(); |
duke@435 | 1776 | if (nt == PointsToNode::LocalVar || nt == PointsToNode::Field) { |
kvn@2276 | 1777 | remove_deferred(ni, &worklist, &visited); |
duke@435 | 1778 | } |
duke@435 | 1779 | } |
kvn@500 | 1780 | |
kvn@3318 | 1781 | // 8. Adjust escape state of nonescaping objects. |
kvn@3254 | 1782 | for (uint next = 0; next < addp_length; ++next) { |
kvn@3254 | 1783 | Node* n = addp_worklist.at(next); |
kvn@3254 | 1784 | adjust_escape_state(n); |
duke@435 | 1785 | } |
duke@435 | 1786 | |
kvn@3318 | 1787 | // push all NoEscape nodes on the worklist |
kvn@3254 | 1788 | worklist.clear(); |
kvn@679 | 1789 | for( uint next = 0; next < cg_length; ++next ) { |
kvn@500 | 1790 | int nk = cg_worklist.at(next); |
kvn@3318 | 1791 | if (ptnode_adr(nk)->escape_state() == PointsToNode::NoEscape && |
kvn@3318 | 1792 | !is_null_ptr(nk)) |
kvn@500 | 1793 | worklist.push(nk); |
kvn@500 | 1794 | } |
kvn@3318 | 1795 | |
kvn@3254 | 1796 | alloc_worklist.clear(); |
kvn@3318 | 1797 | // Propagate scalar_replaceable value. |
kvn@500 | 1798 | while(worklist.length() > 0) { |
kvn@3242 | 1799 | uint nk = worklist.pop(); |
kvn@3242 | 1800 | PointsToNode* ptn = ptnode_adr(nk); |
kvn@679 | 1801 | Node* n = ptn->_node; |
kvn@3254 | 1802 | bool scalar_replaceable = ptn->scalar_replaceable(); |
kvn@3254 | 1803 | if (n->is_Allocate() && scalar_replaceable) { |
twisti@1040 | 1804 | // Push scalar replaceable allocations on alloc_worklist |
kvn@3254 | 1805 | // for processing in split_unique_types(). Note, |
kvn@3254 | 1806 | // following code may change scalar_replaceable value. |
kvn@679 | 1807 | alloc_worklist.append(n); |
kvn@679 | 1808 | } |
kvn@679 | 1809 | uint e_cnt = ptn->edge_count(); |
kvn@679 | 1810 | for (uint ei = 0; ei < e_cnt; ei++) { |
kvn@679 | 1811 | uint npi = ptn->edge_target(ei); |
kvn@3318 | 1812 | if (is_null_ptr(npi)) |
kvn@3318 | 1813 | continue; |
kvn@500 | 1814 | PointsToNode *np = ptnode_adr(npi); |
kvn@500 | 1815 | if (np->escape_state() < PointsToNode::NoEscape) { |
kvn@3242 | 1816 | set_escape_state(npi, PointsToNode::NoEscape); |
kvn@3254 | 1817 | if (!scalar_replaceable) { |
kvn@3254 | 1818 | np->set_scalar_replaceable(false); |
kvn@3254 | 1819 | } |
kvn@3254 | 1820 | worklist.push(npi); |
kvn@3254 | 1821 | } else if (np->scalar_replaceable() && !scalar_replaceable) { |
kvn@3254 | 1822 | np->set_scalar_replaceable(false); |
kvn@679 | 1823 | worklist.push(npi); |
kvn@500 | 1824 | } |
kvn@500 | 1825 | } |
kvn@500 | 1826 | } |
kvn@500 | 1827 | |
duke@435 | 1828 | _collecting = false; |
kvn@679 | 1829 | assert(C->unique() == nodes_size(), "there should be no new ideal nodes during ConnectionGraph build"); |
duke@435 | 1830 | |
kvn@3318 | 1831 | assert(ptnode_adr(_oop_null)->escape_state() == PointsToNode::NoEscape && |
kvn@3318 | 1832 | ptnode_adr(_oop_null)->edge_count() == 0, "sanity"); |
kvn@3242 | 1833 | if (UseCompressedOops) { |
kvn@3318 | 1834 | assert(ptnode_adr(_noop_null)->escape_state() == PointsToNode::NoEscape && |
kvn@3318 | 1835 | ptnode_adr(_noop_null)->edge_count() == 0, "sanity"); |
kvn@3242 | 1836 | } |
kvn@3242 | 1837 | |
kvn@3254 | 1838 | if (EliminateLocks && has_non_escaping_obj) { |
kvn@2951 | 1839 | // Mark locks before changing ideal graph. |
kvn@2951 | 1840 | int cnt = C->macro_count(); |
kvn@2951 | 1841 | for( int i=0; i < cnt; i++ ) { |
kvn@2951 | 1842 | Node *n = C->macro_node(i); |
kvn@2951 | 1843 | if (n->is_AbstractLock()) { // Lock and Unlock nodes |
kvn@2951 | 1844 | AbstractLockNode* alock = n->as_AbstractLock(); |
kvn@3311 | 1845 | if (!alock->is_eliminated() || alock->is_coarsened()) { |
kvn@2951 | 1846 | PointsToNode::EscapeState es = escape_state(alock->obj_node()); |
kvn@2951 | 1847 | assert(es != PointsToNode::UnknownEscape, "should know"); |
kvn@2951 | 1848 | if (es != PointsToNode::UnknownEscape && es != PointsToNode::GlobalEscape) { |
kvn@3311 | 1849 | if (!alock->is_eliminated()) { |
kvn@3311 | 1850 | // Mark it eliminated to update any counters |
kvn@3311 | 1851 | alock->set_eliminated(); |
kvn@3311 | 1852 | } else { |
kvn@3311 | 1853 | // The lock could be marked eliminated by lock coarsening |
kvn@3311 | 1854 | // code during first IGVN before EA. Clear coarsened flag |
kvn@3311 | 1855 | // to eliminate all associated locks/unlocks and relock |
kvn@3311 | 1856 | // during deoptimization. |
kvn@3311 | 1857 | alock->clear_coarsened(); |
kvn@3311 | 1858 | } |
kvn@2951 | 1859 | } |
kvn@2951 | 1860 | } |
kvn@2951 | 1861 | } |
kvn@2951 | 1862 | } |
kvn@2951 | 1863 | } |
kvn@2951 | 1864 | |
kvn@3309 | 1865 | if (OptimizePtrCompare && has_non_escaping_obj) { |
kvn@3309 | 1866 | // Add ConI(#CC_GT) and ConI(#CC_EQ). |
kvn@3309 | 1867 | _pcmp_neq = igvn->makecon(TypeInt::CC_GT); |
kvn@3309 | 1868 | _pcmp_eq = igvn->makecon(TypeInt::CC_EQ); |
kvn@3309 | 1869 | // Optimize objects compare. |
kvn@3309 | 1870 | while (ptr_cmp_worklist.length() != 0) { |
kvn@3309 | 1871 | Node *n = ptr_cmp_worklist.pop(); |
kvn@3309 | 1872 | Node *res = optimize_ptr_compare(n); |
kvn@3309 | 1873 | if (res != NULL) { |
kvn@3309 | 1874 | #ifndef PRODUCT |
kvn@3309 | 1875 | if (PrintOptimizePtrCompare) { |
kvn@3309 | 1876 | tty->print_cr("++++ Replaced: %d %s(%d,%d) --> %s", n->_idx, (n->Opcode() == Op_CmpP ? "CmpP" : "CmpN"), n->in(1)->_idx, n->in(2)->_idx, (res == _pcmp_eq ? "EQ" : "NotEQ")); |
kvn@3309 | 1877 | if (Verbose) { |
kvn@3309 | 1878 | n->dump(1); |
kvn@3309 | 1879 | } |
kvn@3309 | 1880 | } |
kvn@3309 | 1881 | #endif |
kvn@3309 | 1882 | _igvn->replace_node(n, res); |
kvn@3309 | 1883 | } |
kvn@3309 | 1884 | } |
kvn@3309 | 1885 | // cleanup |
kvn@3309 | 1886 | if (_pcmp_neq->outcnt() == 0) |
kvn@3309 | 1887 | igvn->hash_delete(_pcmp_neq); |
kvn@3309 | 1888 | if (_pcmp_eq->outcnt() == 0) |
kvn@3309 | 1889 | igvn->hash_delete(_pcmp_eq); |
kvn@3309 | 1890 | } |
kvn@3309 | 1891 | |
roland@3392 | 1892 | // For MemBarStoreStore nodes added in library_call.cpp, check |
roland@3392 | 1893 | // escape status of associated AllocateNode and optimize out |
roland@3392 | 1894 | // MemBarStoreStore node if the allocated object never escapes. |
roland@3392 | 1895 | while (storestore_worklist.length() != 0) { |
roland@3392 | 1896 | Node *n = storestore_worklist.pop(); |
roland@3392 | 1897 | MemBarStoreStoreNode *storestore = n ->as_MemBarStoreStore(); |
roland@3392 | 1898 | Node *alloc = storestore->in(MemBarNode::Precedent)->in(0); |
roland@3392 | 1899 | assert (alloc->is_Allocate(), "storestore should point to AllocateNode"); |
roland@3392 | 1900 | PointsToNode::EscapeState es = ptnode_adr(alloc->_idx)->escape_state(); |
roland@3392 | 1901 | if (es == PointsToNode::NoEscape || es == PointsToNode::ArgEscape) { |
roland@3392 | 1902 | MemBarNode* mb = MemBarNode::make(C, Op_MemBarCPUOrder, Compile::AliasIdxBot); |
roland@3392 | 1903 | mb->init_req(TypeFunc::Memory, storestore->in(TypeFunc::Memory)); |
roland@3392 | 1904 | mb->init_req(TypeFunc::Control, storestore->in(TypeFunc::Control)); |
roland@3392 | 1905 | |
roland@3392 | 1906 | _igvn->register_new_node_with_optimizer(mb); |
roland@3392 | 1907 | _igvn->replace_node(storestore, mb); |
roland@3392 | 1908 | } |
roland@3392 | 1909 | } |
roland@3392 | 1910 | |
kvn@1989 | 1911 | #ifndef PRODUCT |
kvn@1989 | 1912 | if (PrintEscapeAnalysis) { |
kvn@1989 | 1913 | dump(); // Dump ConnectionGraph |
kvn@1989 | 1914 | } |
kvn@1989 | 1915 | #endif |
kvn@1989 | 1916 | |
kvn@3254 | 1917 | bool has_scalar_replaceable_candidates = false; |
kvn@3254 | 1918 | alloc_length = alloc_worklist.length(); |
kvn@3254 | 1919 | for (uint next = 0; next < alloc_length; ++next) { |
kvn@3254 | 1920 | Node* n = alloc_worklist.at(next); |
kvn@3254 | 1921 | PointsToNode* ptn = ptnode_adr(n->_idx); |
kvn@3254 | 1922 | assert(ptn->escape_state() == PointsToNode::NoEscape, "sanity"); |
kvn@3254 | 1923 | if (ptn->scalar_replaceable()) { |
kvn@3254 | 1924 | has_scalar_replaceable_candidates = true; |
kvn@3254 | 1925 | break; |
kvn@3254 | 1926 | } |
kvn@3254 | 1927 | } |
kvn@3254 | 1928 | |
kvn@679 | 1929 | if ( has_scalar_replaceable_candidates && |
kvn@679 | 1930 | C->AliasLevel() >= 3 && EliminateAllocations ) { |
kvn@473 | 1931 | |
kvn@679 | 1932 | // Now use the escape information to create unique types for |
kvn@679 | 1933 | // scalar replaceable objects. |
kvn@679 | 1934 | split_unique_types(alloc_worklist); |
duke@435 | 1935 | |
kvn@679 | 1936 | if (C->failing()) return false; |
duke@435 | 1937 | |
kvn@679 | 1938 | C->print_method("After Escape Analysis", 2); |
duke@435 | 1939 | |
kvn@500 | 1940 | #ifdef ASSERT |
kvn@679 | 1941 | } else if (Verbose && (PrintEscapeAnalysis || PrintEliminateAllocations)) { |
kvn@500 | 1942 | tty->print("=== No allocations eliminated for "); |
kvn@679 | 1943 | C->method()->print_short_name(); |
kvn@500 | 1944 | if(!EliminateAllocations) { |
kvn@500 | 1945 | tty->print(" since EliminateAllocations is off ==="); |
kvn@679 | 1946 | } else if(!has_scalar_replaceable_candidates) { |
kvn@679 | 1947 | tty->print(" since there are no scalar replaceable candidates ==="); |
kvn@679 | 1948 | } else if(C->AliasLevel() < 3) { |
kvn@500 | 1949 | tty->print(" since AliasLevel < 3 ==="); |
duke@435 | 1950 | } |
kvn@500 | 1951 | tty->cr(); |
kvn@500 | 1952 | #endif |
duke@435 | 1953 | } |
kvn@679 | 1954 | return has_non_escaping_obj; |
duke@435 | 1955 | } |
duke@435 | 1956 | |
kvn@3254 | 1957 | // Find fields initializing values for allocations. |
kvn@3254 | 1958 | void ConnectionGraph::find_init_values(Node* alloc, VectorSet* visited, PhaseTransform* phase) { |
kvn@3254 | 1959 | assert(alloc->is_Allocate(), "Should be called for Allocate nodes only"); |
kvn@3254 | 1960 | PointsToNode* pta = ptnode_adr(alloc->_idx); |
kvn@3254 | 1961 | assert(pta->escape_state() == PointsToNode::NoEscape, "Not escaped Allocate nodes only"); |
kvn@3254 | 1962 | InitializeNode* ini = alloc->as_Allocate()->initialization(); |
kvn@1535 | 1963 | |
kvn@1535 | 1964 | Compile* C = _compile; |
kvn@3254 | 1965 | visited->Reset(); |
kvn@1535 | 1966 | // Check if a oop field's initializing value is recorded and add |
kvn@1535 | 1967 | // a corresponding NULL field's value if it is not recorded. |
kvn@1535 | 1968 | // Connection Graph does not record a default initialization by NULL |
kvn@1535 | 1969 | // captured by Initialize node. |
kvn@1535 | 1970 | // |
kvn@3318 | 1971 | uint null_idx = UseCompressedOops ? _noop_null : _oop_null; |
kvn@3254 | 1972 | uint ae_cnt = pta->edge_count(); |
kvn@3318 | 1973 | bool visited_bottom_offset = false; |
kvn@3254 | 1974 | for (uint ei = 0; ei < ae_cnt; ei++) { |
kvn@3254 | 1975 | uint nidx = pta->edge_target(ei); // Field (AddP) |
kvn@3254 | 1976 | PointsToNode* ptn = ptnode_adr(nidx); |
kvn@3254 | 1977 | assert(ptn->_node->is_AddP(), "Should be AddP nodes only"); |
kvn@3254 | 1978 | int offset = ptn->offset(); |
kvn@3318 | 1979 | if (offset == Type::OffsetBot) { |
kvn@3318 | 1980 | if (!visited_bottom_offset) { |
kvn@3318 | 1981 | visited_bottom_offset = true; |
kvn@3318 | 1982 | // Check only oop fields. |
kvn@3318 | 1983 | const Type* adr_type = ptn->_node->as_AddP()->bottom_type(); |
kvn@3318 | 1984 | if (!adr_type->isa_aryptr() || |
kvn@3318 | 1985 | (adr_type->isa_aryptr()->klass() == NULL) || |
kvn@3318 | 1986 | adr_type->isa_aryptr()->klass()->is_obj_array_klass()) { |
kvn@3318 | 1987 | // OffsetBot is used to reference array's element, |
kvn@3318 | 1988 | // always add reference to NULL since we don't |
kvn@3318 | 1989 | // known which element is referenced. |
kvn@3318 | 1990 | add_edge_from_fields(alloc->_idx, null_idx, offset); |
kvn@3318 | 1991 | } |
kvn@3318 | 1992 | } |
kvn@3318 | 1993 | } else if (offset != oopDesc::klass_offset_in_bytes() && |
kvn@3318 | 1994 | !visited->test_set(offset)) { |
kvn@1535 | 1995 | |
kvn@1535 | 1996 | // Check only oop fields. |
kvn@3254 | 1997 | const Type* adr_type = ptn->_node->as_AddP()->bottom_type(); |
kvn@1535 | 1998 | BasicType basic_field_type = T_INT; |
kvn@1535 | 1999 | if (adr_type->isa_instptr()) { |
kvn@1535 | 2000 | ciField* field = C->alias_type(adr_type->isa_instptr())->field(); |
kvn@1535 | 2001 | if (field != NULL) { |
kvn@1535 | 2002 | basic_field_type = field->layout_type(); |
kvn@1535 | 2003 | } else { |
kvn@1535 | 2004 | // Ignore non field load (for example, klass load) |
kvn@1535 | 2005 | } |
kvn@1535 | 2006 | } else if (adr_type->isa_aryptr()) { |
kvn@3254 | 2007 | if (offset != arrayOopDesc::length_offset_in_bytes()) { |
kvn@3254 | 2008 | const Type* elemtype = adr_type->isa_aryptr()->elem(); |
kvn@3254 | 2009 | basic_field_type = elemtype->array_element_basic_type(); |
kvn@3254 | 2010 | } else { |
kvn@3254 | 2011 | // Ignore array length load |
kvn@3254 | 2012 | } |
kvn@3254 | 2013 | #ifdef ASSERT |
kvn@1535 | 2014 | } else { |
kvn@3254 | 2015 | // Raw pointers are used for initializing stores so skip it |
kvn@3254 | 2016 | // since it should be recorded already |
kvn@3254 | 2017 | Node* base = get_addp_base(ptn->_node); |
kvn@1535 | 2018 | assert(adr_type->isa_rawptr() && base->is_Proj() && |
kvn@1535 | 2019 | (base->in(0) == alloc),"unexpected pointer type"); |
kvn@3254 | 2020 | #endif |
kvn@1535 | 2021 | } |
kvn@1535 | 2022 | if (basic_field_type == T_OBJECT || |
kvn@1535 | 2023 | basic_field_type == T_NARROWOOP || |
kvn@1535 | 2024 | basic_field_type == T_ARRAY) { |
kvn@1535 | 2025 | Node* value = NULL; |
kvn@1535 | 2026 | if (ini != NULL) { |
kvn@1535 | 2027 | BasicType ft = UseCompressedOops ? T_NARROWOOP : T_OBJECT; |
kvn@1535 | 2028 | Node* store = ini->find_captured_store(offset, type2aelembytes(ft), phase); |
kvn@1535 | 2029 | if (store != NULL && store->is_Store()) { |
kvn@1535 | 2030 | value = store->in(MemNode::ValueIn); |
kvn@1535 | 2031 | } else if (ptn->edge_count() > 0) { // Are there oop stores? |
kvn@1535 | 2032 | // Check for a store which follows allocation without branches. |
kvn@1535 | 2033 | // For example, a volatile field store is not collected |
kvn@1535 | 2034 | // by Initialize node. TODO: it would be nice to use idom() here. |
kvn@3254 | 2035 | // |
kvn@3254 | 2036 | // Search all references to the same field which use different |
kvn@3254 | 2037 | // AddP nodes, for example, in the next case: |
kvn@3254 | 2038 | // |
kvn@3254 | 2039 | // Point p[] = new Point[1]; |
kvn@3254 | 2040 | // if ( x ) { p[0] = new Point(); p[0].x = x; } |
kvn@3254 | 2041 | // if ( p[0] != null ) { y = p[0].x; } // has CastPP |
kvn@3254 | 2042 | // |
kvn@3254 | 2043 | for (uint next = ei; (next < ae_cnt) && (value == NULL); next++) { |
kvn@3254 | 2044 | uint fpi = pta->edge_target(next); // Field (AddP) |
kvn@3254 | 2045 | PointsToNode *ptf = ptnode_adr(fpi); |
kvn@3254 | 2046 | if (ptf->offset() == offset) { |
kvn@3254 | 2047 | Node* nf = ptf->_node; |
kvn@3254 | 2048 | for (DUIterator_Fast imax, i = nf->fast_outs(imax); i < imax; i++) { |
kvn@3254 | 2049 | store = nf->fast_out(i); |
kvn@3254 | 2050 | if (store->is_Store() && store->in(0) != NULL) { |
kvn@3254 | 2051 | Node* ctrl = store->in(0); |
kvn@3254 | 2052 | while(!(ctrl == ini || ctrl == alloc || ctrl == NULL || |
kvn@3254 | 2053 | ctrl == C->root() || ctrl == C->top() || ctrl->is_Region() || |
kvn@3254 | 2054 | ctrl->is_IfTrue() || ctrl->is_IfFalse())) { |
kvn@3254 | 2055 | ctrl = ctrl->in(0); |
kvn@3254 | 2056 | } |
kvn@3254 | 2057 | if (ctrl == ini || ctrl == alloc) { |
kvn@3254 | 2058 | value = store->in(MemNode::ValueIn); |
kvn@3254 | 2059 | break; |
kvn@3254 | 2060 | } |
kvn@3254 | 2061 | } |
kvn@1535 | 2062 | } |
kvn@1535 | 2063 | } |
kvn@1535 | 2064 | } |
kvn@1535 | 2065 | } |
kvn@1535 | 2066 | } |
kvn@1535 | 2067 | if (value == NULL || value != ptnode_adr(value->_idx)->_node) { |
kvn@1535 | 2068 | // A field's initializing value was not recorded. Add NULL. |
kvn@3254 | 2069 | add_edge_from_fields(alloc->_idx, null_idx, offset); |
kvn@1535 | 2070 | } |
kvn@1535 | 2071 | } |
kvn@1535 | 2072 | } |
kvn@1535 | 2073 | } |
kvn@3254 | 2074 | } |
kvn@3254 | 2075 | |
kvn@3254 | 2076 | // Adjust escape state after Connection Graph is built. |
kvn@3254 | 2077 | void ConnectionGraph::adjust_escape_state(Node* n) { |
kvn@3254 | 2078 | PointsToNode* ptn = ptnode_adr(n->_idx); |
kvn@3254 | 2079 | assert(n->is_AddP(), "Should be called for AddP nodes only"); |
kvn@3254 | 2080 | // Search for objects which are not scalar replaceable |
kvn@3254 | 2081 | // and mark them to propagate the state to referenced objects. |
kvn@3254 | 2082 | // |
kvn@3254 | 2083 | |
kvn@3254 | 2084 | int offset = ptn->offset(); |
kvn@3254 | 2085 | Node* base = get_addp_base(n); |
kvn@3254 | 2086 | VectorSet* ptset = PointsTo(base); |
kvn@3254 | 2087 | int ptset_size = ptset->Size(); |
kvn@1535 | 2088 | |
kvn@1535 | 2089 | // An object is not scalar replaceable if the field which may point |
kvn@1535 | 2090 | // to it has unknown offset (unknown element of an array of objects). |
kvn@1535 | 2091 | // |
kvn@3254 | 2092 | |
kvn@1535 | 2093 | if (offset == Type::OffsetBot) { |
kvn@1535 | 2094 | uint e_cnt = ptn->edge_count(); |
kvn@1535 | 2095 | for (uint ei = 0; ei < e_cnt; ei++) { |
kvn@1535 | 2096 | uint npi = ptn->edge_target(ei); |
kvn@3254 | 2097 | ptnode_adr(npi)->set_scalar_replaceable(false); |
kvn@1535 | 2098 | } |
kvn@1535 | 2099 | } |
kvn@1535 | 2100 | |
kvn@1535 | 2101 | // Currently an object is not scalar replaceable if a LoadStore node |
kvn@1535 | 2102 | // access its field since the field value is unknown after it. |
kvn@1535 | 2103 | // |
kvn@1535 | 2104 | bool has_LoadStore = false; |
kvn@1535 | 2105 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
kvn@1535 | 2106 | Node *use = n->fast_out(i); |
kvn@1535 | 2107 | if (use->is_LoadStore()) { |
kvn@1535 | 2108 | has_LoadStore = true; |
kvn@1535 | 2109 | break; |
kvn@1535 | 2110 | } |
kvn@1535 | 2111 | } |
kvn@1535 | 2112 | // An object is not scalar replaceable if the address points |
kvn@1535 | 2113 | // to unknown field (unknown element for arrays, offset is OffsetBot). |
kvn@1535 | 2114 | // |
kvn@1535 | 2115 | // Or the address may point to more then one object. This may produce |
kvn@3254 | 2116 | // the false positive result (set not scalar replaceable) |
kvn@1535 | 2117 | // since the flow-insensitive escape analysis can't separate |
kvn@1535 | 2118 | // the case when stores overwrite the field's value from the case |
kvn@1535 | 2119 | // when stores happened on different control branches. |
kvn@1535 | 2120 | // |
kvn@3254 | 2121 | // Note: it will disable scalar replacement in some cases: |
kvn@3254 | 2122 | // |
kvn@3254 | 2123 | // Point p[] = new Point[1]; |
kvn@3254 | 2124 | // p[0] = new Point(); // Will be not scalar replaced |
kvn@3254 | 2125 | // |
kvn@3254 | 2126 | // but it will save us from incorrect optimizations in next cases: |
kvn@3254 | 2127 | // |
kvn@3254 | 2128 | // Point p[] = new Point[1]; |
kvn@3254 | 2129 | // if ( x ) p[0] = new Point(); // Will be not scalar replaced |
kvn@3254 | 2130 | // |
kvn@1535 | 2131 | if (ptset_size > 1 || ptset_size != 0 && |
kvn@1535 | 2132 | (has_LoadStore || offset == Type::OffsetBot)) { |
kvn@2556 | 2133 | for( VectorSetI j(ptset); j.test(); ++j ) { |
kvn@3254 | 2134 | ptnode_adr(j.elem)->set_scalar_replaceable(false); |
kvn@1535 | 2135 | } |
kvn@1535 | 2136 | } |
kvn@1535 | 2137 | } |
kvn@1535 | 2138 | |
kvn@3254 | 2139 | // Propagate escape states to referenced nodes. |
kvn@3254 | 2140 | bool ConnectionGraph::propagate_escape_state(GrowableArray<int>* cg_worklist, |
kvn@3254 | 2141 | GrowableArray<uint>* worklist, |
kvn@3254 | 2142 | PointsToNode::EscapeState esc_state) { |
kvn@3254 | 2143 | bool has_java_obj = false; |
kvn@3254 | 2144 | |
kvn@3254 | 2145 | // push all nodes with the same escape state on the worklist |
kvn@3254 | 2146 | uint cg_length = cg_worklist->length(); |
kvn@3254 | 2147 | for (uint next = 0; next < cg_length; ++next) { |
kvn@3254 | 2148 | int nk = cg_worklist->at(next); |
kvn@3254 | 2149 | if (ptnode_adr(nk)->escape_state() == esc_state) |
kvn@3254 | 2150 | worklist->push(nk); |
kvn@3254 | 2151 | } |
kvn@3254 | 2152 | // mark all reachable nodes |
kvn@3254 | 2153 | while (worklist->length() > 0) { |
kvn@3318 | 2154 | int pt = worklist->pop(); |
kvn@3318 | 2155 | PointsToNode* ptn = ptnode_adr(pt); |
kvn@3318 | 2156 | if (ptn->node_type() == PointsToNode::JavaObject && |
kvn@3318 | 2157 | !is_null_ptr(pt)) { |
kvn@3254 | 2158 | has_java_obj = true; |
kvn@3318 | 2159 | if (esc_state > PointsToNode::NoEscape) { |
kvn@3318 | 2160 | // fields values are unknown if object escapes |
kvn@3318 | 2161 | add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); |
kvn@3318 | 2162 | } |
kvn@3254 | 2163 | } |
kvn@3254 | 2164 | uint e_cnt = ptn->edge_count(); |
kvn@3254 | 2165 | for (uint ei = 0; ei < e_cnt; ei++) { |
kvn@3254 | 2166 | uint npi = ptn->edge_target(ei); |
kvn@3318 | 2167 | if (is_null_ptr(npi)) |
kvn@3318 | 2168 | continue; |
kvn@3254 | 2169 | PointsToNode *np = ptnode_adr(npi); |
kvn@3254 | 2170 | if (np->escape_state() < esc_state) { |
kvn@3254 | 2171 | set_escape_state(npi, esc_state); |
kvn@3254 | 2172 | worklist->push(npi); |
kvn@3254 | 2173 | } |
kvn@3254 | 2174 | } |
kvn@3254 | 2175 | } |
kvn@3254 | 2176 | // Has not escaping java objects |
kvn@3254 | 2177 | return has_java_obj && (esc_state < PointsToNode::GlobalEscape); |
kvn@3254 | 2178 | } |
kvn@3254 | 2179 | |
kvn@3309 | 2180 | // Optimize objects compare. |
kvn@3309 | 2181 | Node* ConnectionGraph::optimize_ptr_compare(Node* n) { |
kvn@3309 | 2182 | assert(OptimizePtrCompare, "sanity"); |
kvn@3309 | 2183 | // Clone returned Set since PointsTo() returns pointer |
kvn@3309 | 2184 | // to the same structure ConnectionGraph.pt_ptset. |
kvn@3309 | 2185 | VectorSet ptset1 = *PointsTo(n->in(1)); |
kvn@3309 | 2186 | VectorSet ptset2 = *PointsTo(n->in(2)); |
kvn@3309 | 2187 | |
kvn@3309 | 2188 | // Check simple cases first. |
kvn@3309 | 2189 | if (ptset1.Size() == 1) { |
kvn@3309 | 2190 | uint pt1 = ptset1.getelem(); |
kvn@3309 | 2191 | PointsToNode* ptn1 = ptnode_adr(pt1); |
kvn@3309 | 2192 | if (ptn1->escape_state() == PointsToNode::NoEscape) { |
kvn@3309 | 2193 | if (ptset2.Size() == 1 && ptset2.getelem() == pt1) { |
kvn@3309 | 2194 | // Comparing the same not escaping object. |
kvn@3309 | 2195 | return _pcmp_eq; |
kvn@3309 | 2196 | } |
kvn@3309 | 2197 | Node* obj = ptn1->_node; |
kvn@3309 | 2198 | // Comparing not escaping allocation. |
kvn@3309 | 2199 | if ((obj->is_Allocate() || obj->is_CallStaticJava()) && |
kvn@3309 | 2200 | !ptset2.test(pt1)) { |
kvn@3309 | 2201 | return _pcmp_neq; // This includes nullness check. |
kvn@3309 | 2202 | } |
kvn@3309 | 2203 | } |
kvn@3309 | 2204 | } else if (ptset2.Size() == 1) { |
kvn@3309 | 2205 | uint pt2 = ptset2.getelem(); |
kvn@3309 | 2206 | PointsToNode* ptn2 = ptnode_adr(pt2); |
kvn@3309 | 2207 | if (ptn2->escape_state() == PointsToNode::NoEscape) { |
kvn@3309 | 2208 | Node* obj = ptn2->_node; |
kvn@3309 | 2209 | // Comparing not escaping allocation. |
kvn@3309 | 2210 | if ((obj->is_Allocate() || obj->is_CallStaticJava()) && |
kvn@3309 | 2211 | !ptset1.test(pt2)) { |
kvn@3309 | 2212 | return _pcmp_neq; // This includes nullness check. |
kvn@3309 | 2213 | } |
kvn@3309 | 2214 | } |
kvn@3309 | 2215 | } |
kvn@3309 | 2216 | |
kvn@3309 | 2217 | if (!ptset1.disjoint(ptset2)) { |
kvn@3309 | 2218 | return NULL; // Sets are not disjoint |
kvn@3309 | 2219 | } |
kvn@3309 | 2220 | |
kvn@3309 | 2221 | // Sets are disjoint. |
kvn@3309 | 2222 | bool set1_has_unknown_ptr = ptset1.test(_phantom_object) != 0; |
kvn@3309 | 2223 | bool set2_has_unknown_ptr = ptset2.test(_phantom_object) != 0; |
kvn@3309 | 2224 | bool set1_has_null_ptr = (ptset1.test(_oop_null) | ptset1.test(_noop_null)) != 0; |
kvn@3309 | 2225 | bool set2_has_null_ptr = (ptset2.test(_oop_null) | ptset2.test(_noop_null)) != 0; |
kvn@3309 | 2226 | |
kvn@3309 | 2227 | if (set1_has_unknown_ptr && set2_has_null_ptr || |
kvn@3309 | 2228 | set2_has_unknown_ptr && set1_has_null_ptr) { |
kvn@3309 | 2229 | // Check nullness of unknown object. |
kvn@3309 | 2230 | return NULL; |
kvn@3309 | 2231 | } |
kvn@3309 | 2232 | |
kvn@3309 | 2233 | // Disjointness by itself is not sufficient since |
kvn@3309 | 2234 | // alias analysis is not complete for escaped objects. |
kvn@3309 | 2235 | // Disjoint sets are definitely unrelated only when |
kvn@3309 | 2236 | // at least one set has only not escaping objects. |
kvn@3309 | 2237 | if (!set1_has_unknown_ptr && !set1_has_null_ptr) { |
kvn@3309 | 2238 | bool has_only_non_escaping_alloc = true; |
kvn@3309 | 2239 | for (VectorSetI i(&ptset1); i.test(); ++i) { |
kvn@3309 | 2240 | uint pt = i.elem; |
kvn@3309 | 2241 | PointsToNode* ptn = ptnode_adr(pt); |
kvn@3309 | 2242 | Node* obj = ptn->_node; |
kvn@3309 | 2243 | if (ptn->escape_state() != PointsToNode::NoEscape || |
kvn@3309 | 2244 | !(obj->is_Allocate() || obj->is_CallStaticJava())) { |
kvn@3309 | 2245 | has_only_non_escaping_alloc = false; |
kvn@3309 | 2246 | break; |
kvn@3309 | 2247 | } |
kvn@3309 | 2248 | } |
kvn@3309 | 2249 | if (has_only_non_escaping_alloc) { |
kvn@3309 | 2250 | return _pcmp_neq; |
kvn@3309 | 2251 | } |
kvn@3309 | 2252 | } |
kvn@3309 | 2253 | if (!set2_has_unknown_ptr && !set2_has_null_ptr) { |
kvn@3309 | 2254 | bool has_only_non_escaping_alloc = true; |
kvn@3309 | 2255 | for (VectorSetI i(&ptset2); i.test(); ++i) { |
kvn@3309 | 2256 | uint pt = i.elem; |
kvn@3309 | 2257 | PointsToNode* ptn = ptnode_adr(pt); |
kvn@3309 | 2258 | Node* obj = ptn->_node; |
kvn@3309 | 2259 | if (ptn->escape_state() != PointsToNode::NoEscape || |
kvn@3309 | 2260 | !(obj->is_Allocate() || obj->is_CallStaticJava())) { |
kvn@3309 | 2261 | has_only_non_escaping_alloc = false; |
kvn@3309 | 2262 | break; |
kvn@3309 | 2263 | } |
kvn@3309 | 2264 | } |
kvn@3309 | 2265 | if (has_only_non_escaping_alloc) { |
kvn@3309 | 2266 | return _pcmp_neq; |
kvn@3309 | 2267 | } |
kvn@3309 | 2268 | } |
kvn@3309 | 2269 | return NULL; |
kvn@3309 | 2270 | } |
kvn@3309 | 2271 | |
duke@435 | 2272 | void ConnectionGraph::process_call_arguments(CallNode *call, PhaseTransform *phase) { |
kvn@3318 | 2273 | bool is_arraycopy = false; |
duke@435 | 2274 | switch (call->Opcode()) { |
kvn@500 | 2275 | #ifdef ASSERT |
duke@435 | 2276 | case Op_Allocate: |
duke@435 | 2277 | case Op_AllocateArray: |
duke@435 | 2278 | case Op_Lock: |
duke@435 | 2279 | case Op_Unlock: |
kvn@500 | 2280 | assert(false, "should be done already"); |
duke@435 | 2281 | break; |
kvn@500 | 2282 | #endif |
kvn@3318 | 2283 | case Op_CallLeafNoFP: |
kvn@3318 | 2284 | is_arraycopy = (call->as_CallLeaf()->_name != NULL && |
kvn@3318 | 2285 | strstr(call->as_CallLeaf()->_name, "arraycopy") != 0); |
kvn@3318 | 2286 | // fall through |
kvn@1535 | 2287 | case Op_CallLeaf: |
kvn@500 | 2288 | { |
kvn@500 | 2289 | // Stub calls, objects do not escape but they are not scale replaceable. |
kvn@500 | 2290 | // Adjust escape state for outgoing arguments. |
kvn@500 | 2291 | const TypeTuple * d = call->tf()->domain(); |
kvn@3318 | 2292 | bool src_has_oops = false; |
kvn@500 | 2293 | for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
kvn@500 | 2294 | const Type* at = d->field_at(i); |
kvn@500 | 2295 | Node *arg = call->in(i)->uncast(); |
kvn@500 | 2296 | const Type *aat = phase->type(arg); |
kvn@3318 | 2297 | PointsToNode::EscapeState arg_esc = ptnode_adr(arg->_idx)->escape_state(); |
kvn@1535 | 2298 | if (!arg->is_top() && at->isa_ptr() && aat->isa_ptr() && |
kvn@3318 | 2299 | (is_arraycopy || arg_esc < PointsToNode::ArgEscape)) { |
kvn@1535 | 2300 | |
kvn@500 | 2301 | assert(aat == Type::TOP || aat == TypePtr::NULL_PTR || |
kvn@500 | 2302 | aat->isa_ptr() != NULL, "expecting an Ptr"); |
kvn@3318 | 2303 | bool arg_has_oops = aat->isa_oopptr() && |
kvn@3318 | 2304 | (aat->isa_oopptr()->klass() == NULL || aat->isa_instptr() || |
kvn@3318 | 2305 | (aat->isa_aryptr() && aat->isa_aryptr()->klass()->is_obj_array_klass())); |
kvn@3318 | 2306 | if (i == TypeFunc::Parms) { |
kvn@3318 | 2307 | src_has_oops = arg_has_oops; |
kvn@3318 | 2308 | } |
kvn@3318 | 2309 | // |
kvn@3318 | 2310 | // src or dst could be j.l.Object when other is basic type array: |
kvn@3318 | 2311 | // |
kvn@3318 | 2312 | // arraycopy(char[],0,Object*,0,size); |
kvn@3318 | 2313 | // arraycopy(Object*,0,char[],0,size); |
kvn@3318 | 2314 | // |
kvn@3318 | 2315 | // Don't add edges from dst's fields in such cases. |
kvn@3318 | 2316 | // |
kvn@3318 | 2317 | bool arg_is_arraycopy_dest = src_has_oops && is_arraycopy && |
kvn@3318 | 2318 | arg_has_oops && (i > TypeFunc::Parms); |
kvn@1535 | 2319 | #ifdef ASSERT |
kvn@3318 | 2320 | if (!(is_arraycopy || |
kvn@1535 | 2321 | call->as_CallLeaf()->_name != NULL && |
kvn@1535 | 2322 | (strcmp(call->as_CallLeaf()->_name, "g1_wb_pre") == 0 || |
kvn@1535 | 2323 | strcmp(call->as_CallLeaf()->_name, "g1_wb_post") == 0 )) |
kvn@1535 | 2324 | ) { |
kvn@1535 | 2325 | call->dump(); |
kvn@1535 | 2326 | assert(false, "EA: unexpected CallLeaf"); |
kvn@1535 | 2327 | } |
kvn@1535 | 2328 | #endif |
kvn@3318 | 2329 | // Always process arraycopy's destination object since |
kvn@3318 | 2330 | // we need to add all possible edges to references in |
kvn@3318 | 2331 | // source object. |
kvn@3318 | 2332 | if (arg_esc >= PointsToNode::ArgEscape && |
kvn@3318 | 2333 | !arg_is_arraycopy_dest) { |
kvn@3318 | 2334 | continue; |
kvn@3318 | 2335 | } |
kvn@500 | 2336 | set_escape_state(arg->_idx, PointsToNode::ArgEscape); |
kvn@3318 | 2337 | Node* arg_base = arg; |
kvn@500 | 2338 | if (arg->is_AddP()) { |
kvn@500 | 2339 | // |
kvn@500 | 2340 | // The inline_native_clone() case when the arraycopy stub is called |
kvn@500 | 2341 | // after the allocation before Initialize and CheckCastPP nodes. |
kvn@3318 | 2342 | // Or normal arraycopy for object arrays case. |
kvn@500 | 2343 | // |
kvn@500 | 2344 | // Set AddP's base (Allocate) as not scalar replaceable since |
kvn@500 | 2345 | // pointer to the base (with offset) is passed as argument. |
kvn@500 | 2346 | // |
kvn@3318 | 2347 | arg_base = get_addp_base(arg); |
kvn@500 | 2348 | } |
kvn@3318 | 2349 | VectorSet argset = *PointsTo(arg_base); // Clone set |
kvn@3318 | 2350 | for( VectorSetI j(&argset); j.test(); ++j ) { |
kvn@3318 | 2351 | uint pd = j.elem; // Destination object |
kvn@3318 | 2352 | set_escape_state(pd, PointsToNode::ArgEscape); |
kvn@3318 | 2353 | |
kvn@3318 | 2354 | if (arg_is_arraycopy_dest) { |
kvn@3318 | 2355 | PointsToNode* ptd = ptnode_adr(pd); |
kvn@3318 | 2356 | // Conservatively reference an unknown object since |
kvn@3318 | 2357 | // not all source's fields/elements may be known. |
kvn@3318 | 2358 | add_edge_from_fields(pd, _phantom_object, Type::OffsetBot); |
kvn@3318 | 2359 | |
kvn@3318 | 2360 | Node *src = call->in(TypeFunc::Parms)->uncast(); |
kvn@3318 | 2361 | Node* src_base = src; |
kvn@3318 | 2362 | if (src->is_AddP()) { |
kvn@3318 | 2363 | src_base = get_addp_base(src); |
kvn@3318 | 2364 | } |
kvn@3318 | 2365 | // Create edges from destination's fields to |
kvn@3318 | 2366 | // everything known source's fields could point to. |
kvn@3318 | 2367 | for( VectorSetI s(PointsTo(src_base)); s.test(); ++s ) { |
kvn@3318 | 2368 | uint ps = s.elem; |
kvn@3318 | 2369 | bool has_bottom_offset = false; |
kvn@3318 | 2370 | for (uint fd = 0; fd < ptd->edge_count(); fd++) { |
kvn@3318 | 2371 | assert(ptd->edge_type(fd) == PointsToNode::FieldEdge, "expecting a field edge"); |
kvn@3318 | 2372 | int fdi = ptd->edge_target(fd); |
kvn@3318 | 2373 | PointsToNode* pfd = ptnode_adr(fdi); |
kvn@3318 | 2374 | int offset = pfd->offset(); |
kvn@3318 | 2375 | if (offset == Type::OffsetBot) |
kvn@3318 | 2376 | has_bottom_offset = true; |
kvn@3318 | 2377 | assert(offset != -1, "offset should be set"); |
kvn@3318 | 2378 | add_deferred_edge_to_fields(fdi, ps, offset); |
kvn@3318 | 2379 | } |
kvn@3318 | 2380 | // Destination object may not have access (no field edge) |
kvn@3318 | 2381 | // to fields which are accessed in source object. |
kvn@3318 | 2382 | // As result no edges will be created to those source's |
kvn@3318 | 2383 | // fields and escape state of destination object will |
kvn@3318 | 2384 | // not be propagated to those fields. |
kvn@3318 | 2385 | // |
kvn@3318 | 2386 | // Mark source object as global escape except in |
kvn@3318 | 2387 | // the case with Type::OffsetBot field (which is |
kvn@3318 | 2388 | // common case for array elements access) when |
kvn@3318 | 2389 | // edges are created to all source's fields. |
kvn@3318 | 2390 | if (!has_bottom_offset) { |
kvn@3318 | 2391 | set_escape_state(ps, PointsToNode::GlobalEscape); |
kvn@3318 | 2392 | } |
kvn@3318 | 2393 | } |
kvn@3318 | 2394 | } |
kvn@500 | 2395 | } |
kvn@500 | 2396 | } |
kvn@500 | 2397 | } |
kvn@500 | 2398 | break; |
kvn@500 | 2399 | } |
duke@435 | 2400 | |
duke@435 | 2401 | case Op_CallStaticJava: |
duke@435 | 2402 | // For a static call, we know exactly what method is being called. |
duke@435 | 2403 | // Use bytecode estimator to record the call's escape affects |
duke@435 | 2404 | { |
duke@435 | 2405 | ciMethod *meth = call->as_CallJava()->method(); |
kvn@500 | 2406 | BCEscapeAnalyzer *call_analyzer = (meth !=NULL) ? meth->get_bcea() : NULL; |
kvn@500 | 2407 | // fall-through if not a Java method or no analyzer information |
kvn@500 | 2408 | if (call_analyzer != NULL) { |
duke@435 | 2409 | const TypeTuple * d = call->tf()->domain(); |
kvn@500 | 2410 | bool copy_dependencies = false; |
duke@435 | 2411 | for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
duke@435 | 2412 | const Type* at = d->field_at(i); |
duke@435 | 2413 | int k = i - TypeFunc::Parms; |
kvn@1535 | 2414 | Node *arg = call->in(i)->uncast(); |
duke@435 | 2415 | |
kvn@1535 | 2416 | if (at->isa_oopptr() != NULL && |
kvn@1571 | 2417 | ptnode_adr(arg->_idx)->escape_state() < PointsToNode::GlobalEscape) { |
duke@435 | 2418 | |
kvn@500 | 2419 | bool global_escapes = false; |
kvn@500 | 2420 | bool fields_escapes = false; |
kvn@500 | 2421 | if (!call_analyzer->is_arg_stack(k)) { |
duke@435 | 2422 | // The argument global escapes, mark everything it could point to |
kvn@500 | 2423 | set_escape_state(arg->_idx, PointsToNode::GlobalEscape); |
kvn@500 | 2424 | global_escapes = true; |
kvn@500 | 2425 | } else { |
kvn@500 | 2426 | if (!call_analyzer->is_arg_local(k)) { |
kvn@500 | 2427 | // The argument itself doesn't escape, but any fields might |
kvn@500 | 2428 | fields_escapes = true; |
kvn@500 | 2429 | } |
kvn@500 | 2430 | set_escape_state(arg->_idx, PointsToNode::ArgEscape); |
kvn@500 | 2431 | copy_dependencies = true; |
kvn@500 | 2432 | } |
duke@435 | 2433 | |
kvn@2556 | 2434 | for( VectorSetI j(PointsTo(arg)); j.test(); ++j ) { |
kvn@500 | 2435 | uint pt = j.elem; |
kvn@500 | 2436 | if (global_escapes) { |
kvn@3318 | 2437 | // The argument global escapes, mark everything it could point to |
duke@435 | 2438 | set_escape_state(pt, PointsToNode::GlobalEscape); |
kvn@3318 | 2439 | add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); |
kvn@500 | 2440 | } else { |
kvn@3318 | 2441 | set_escape_state(pt, PointsToNode::ArgEscape); |
kvn@500 | 2442 | if (fields_escapes) { |
kvn@3318 | 2443 | // The argument itself doesn't escape, but any fields might. |
kvn@3318 | 2444 | // Use OffsetTop to indicate such case. |
kvn@3318 | 2445 | add_edge_from_fields(pt, _phantom_object, Type::OffsetTop); |
kvn@500 | 2446 | } |
duke@435 | 2447 | } |
duke@435 | 2448 | } |
duke@435 | 2449 | } |
duke@435 | 2450 | } |
kvn@500 | 2451 | if (copy_dependencies) |
kvn@679 | 2452 | call_analyzer->copy_dependencies(_compile->dependencies()); |
duke@435 | 2453 | break; |
duke@435 | 2454 | } |
duke@435 | 2455 | } |
duke@435 | 2456 | |
duke@435 | 2457 | default: |
kvn@500 | 2458 | // Fall-through here if not a Java method or no analyzer information |
kvn@500 | 2459 | // or some other type of call, assume the worst case: all arguments |
duke@435 | 2460 | // globally escape. |
duke@435 | 2461 | { |
duke@435 | 2462 | // adjust escape state for outgoing arguments |
duke@435 | 2463 | const TypeTuple * d = call->tf()->domain(); |
duke@435 | 2464 | for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
duke@435 | 2465 | const Type* at = d->field_at(i); |
duke@435 | 2466 | if (at->isa_oopptr() != NULL) { |
kvn@500 | 2467 | Node *arg = call->in(i)->uncast(); |
kvn@500 | 2468 | set_escape_state(arg->_idx, PointsToNode::GlobalEscape); |
kvn@2556 | 2469 | for( VectorSetI j(PointsTo(arg)); j.test(); ++j ) { |
duke@435 | 2470 | uint pt = j.elem; |
duke@435 | 2471 | set_escape_state(pt, PointsToNode::GlobalEscape); |
kvn@3318 | 2472 | add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); |
duke@435 | 2473 | } |
duke@435 | 2474 | } |
duke@435 | 2475 | } |
duke@435 | 2476 | } |
duke@435 | 2477 | } |
duke@435 | 2478 | } |
duke@435 | 2479 | void ConnectionGraph::process_call_result(ProjNode *resproj, PhaseTransform *phase) { |
kvn@679 | 2480 | CallNode *call = resproj->in(0)->as_Call(); |
kvn@679 | 2481 | uint call_idx = call->_idx; |
kvn@679 | 2482 | uint resproj_idx = resproj->_idx; |
duke@435 | 2483 | |
duke@435 | 2484 | switch (call->Opcode()) { |
duke@435 | 2485 | case Op_Allocate: |
duke@435 | 2486 | { |
duke@435 | 2487 | Node *k = call->in(AllocateNode::KlassNode); |
kvn@1894 | 2488 | const TypeKlassPtr *kt = k->bottom_type()->isa_klassptr(); |
duke@435 | 2489 | assert(kt != NULL, "TypeKlassPtr required."); |
duke@435 | 2490 | ciKlass* cik = kt->klass(); |
duke@435 | 2491 | |
kvn@500 | 2492 | PointsToNode::EscapeState es; |
kvn@500 | 2493 | uint edge_to; |
kvn@1894 | 2494 | if (cik->is_subclass_of(_compile->env()->Thread_klass()) || |
kvn@1894 | 2495 | !cik->is_instance_klass() || // StressReflectiveCode |
kvn@1894 | 2496 | cik->as_instance_klass()->has_finalizer()) { |
kvn@500 | 2497 | es = PointsToNode::GlobalEscape; |
kvn@500 | 2498 | edge_to = _phantom_object; // Could not be worse |
duke@435 | 2499 | } else { |
kvn@500 | 2500 | es = PointsToNode::NoEscape; |
kvn@679 | 2501 | edge_to = call_idx; |
kvn@3254 | 2502 | assert(ptnode_adr(call_idx)->scalar_replaceable(), "sanity"); |
duke@435 | 2503 | } |
kvn@679 | 2504 | set_escape_state(call_idx, es); |
kvn@679 | 2505 | add_pointsto_edge(resproj_idx, edge_to); |
kvn@679 | 2506 | _processed.set(resproj_idx); |
duke@435 | 2507 | break; |
duke@435 | 2508 | } |
duke@435 | 2509 | |
duke@435 | 2510 | case Op_AllocateArray: |
duke@435 | 2511 | { |
kvn@1894 | 2512 | |
kvn@1894 | 2513 | Node *k = call->in(AllocateNode::KlassNode); |
kvn@1894 | 2514 | const TypeKlassPtr *kt = k->bottom_type()->isa_klassptr(); |
kvn@1894 | 2515 | assert(kt != NULL, "TypeKlassPtr required."); |
kvn@1894 | 2516 | ciKlass* cik = kt->klass(); |
kvn@1894 | 2517 | |
kvn@1894 | 2518 | PointsToNode::EscapeState es; |
kvn@1894 | 2519 | uint edge_to; |
kvn@1894 | 2520 | if (!cik->is_array_klass()) { // StressReflectiveCode |
kvn@1894 | 2521 | es = PointsToNode::GlobalEscape; |
kvn@1894 | 2522 | edge_to = _phantom_object; |
kvn@1894 | 2523 | } else { |
kvn@1894 | 2524 | es = PointsToNode::NoEscape; |
kvn@1894 | 2525 | edge_to = call_idx; |
kvn@3254 | 2526 | assert(ptnode_adr(call_idx)->scalar_replaceable(), "sanity"); |
kvn@1894 | 2527 | int length = call->in(AllocateNode::ALength)->find_int_con(-1); |
kvn@1894 | 2528 | if (length < 0 || length > EliminateAllocationArraySizeLimit) { |
kvn@1894 | 2529 | // Not scalar replaceable if the length is not constant or too big. |
kvn@3254 | 2530 | ptnode_adr(call_idx)->set_scalar_replaceable(false); |
kvn@1894 | 2531 | } |
kvn@500 | 2532 | } |
kvn@1894 | 2533 | set_escape_state(call_idx, es); |
kvn@1894 | 2534 | add_pointsto_edge(resproj_idx, edge_to); |
kvn@679 | 2535 | _processed.set(resproj_idx); |
duke@435 | 2536 | break; |
duke@435 | 2537 | } |
duke@435 | 2538 | |
duke@435 | 2539 | case Op_CallStaticJava: |
duke@435 | 2540 | // For a static call, we know exactly what method is being called. |
duke@435 | 2541 | // Use bytecode estimator to record whether the call's return value escapes |
duke@435 | 2542 | { |
kvn@500 | 2543 | bool done = true; |
duke@435 | 2544 | const TypeTuple *r = call->tf()->range(); |
duke@435 | 2545 | const Type* ret_type = NULL; |
duke@435 | 2546 | |
duke@435 | 2547 | if (r->cnt() > TypeFunc::Parms) |
duke@435 | 2548 | ret_type = r->field_at(TypeFunc::Parms); |
duke@435 | 2549 | |
duke@435 | 2550 | // Note: we use isa_ptr() instead of isa_oopptr() here because the |
duke@435 | 2551 | // _multianewarray functions return a TypeRawPtr. |
kvn@500 | 2552 | if (ret_type == NULL || ret_type->isa_ptr() == NULL) { |
kvn@679 | 2553 | _processed.set(resproj_idx); |
duke@435 | 2554 | break; // doesn't return a pointer type |
kvn@500 | 2555 | } |
duke@435 | 2556 | ciMethod *meth = call->as_CallJava()->method(); |
kvn@500 | 2557 | const TypeTuple * d = call->tf()->domain(); |
duke@435 | 2558 | if (meth == NULL) { |
duke@435 | 2559 | // not a Java method, assume global escape |
kvn@679 | 2560 | set_escape_state(call_idx, PointsToNode::GlobalEscape); |
kvn@679 | 2561 | add_pointsto_edge(resproj_idx, _phantom_object); |
duke@435 | 2562 | } else { |
kvn@500 | 2563 | BCEscapeAnalyzer *call_analyzer = meth->get_bcea(); |
kvn@500 | 2564 | bool copy_dependencies = false; |
duke@435 | 2565 | |
kvn@500 | 2566 | if (call_analyzer->is_return_allocated()) { |
kvn@500 | 2567 | // Returns a newly allocated unescaped object, simply |
kvn@500 | 2568 | // update dependency information. |
kvn@500 | 2569 | // Mark it as NoEscape so that objects referenced by |
kvn@500 | 2570 | // it's fields will be marked as NoEscape at least. |
kvn@679 | 2571 | set_escape_state(call_idx, PointsToNode::NoEscape); |
kvn@3254 | 2572 | ptnode_adr(call_idx)->set_scalar_replaceable(false); |
kvn@3318 | 2573 | // Fields values are unknown |
kvn@3318 | 2574 | add_edge_from_fields(call_idx, _phantom_object, Type::OffsetBot); |
kvn@679 | 2575 | add_pointsto_edge(resproj_idx, call_idx); |
kvn@500 | 2576 | copy_dependencies = true; |
kvn@3318 | 2577 | } else { |
duke@435 | 2578 | // determine whether any arguments are returned |
kvn@3254 | 2579 | set_escape_state(call_idx, PointsToNode::ArgEscape); |
kvn@742 | 2580 | bool ret_arg = false; |
duke@435 | 2581 | for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
duke@435 | 2582 | const Type* at = d->field_at(i); |
duke@435 | 2583 | if (at->isa_oopptr() != NULL) { |
kvn@500 | 2584 | Node *arg = call->in(i)->uncast(); |
duke@435 | 2585 | |
kvn@500 | 2586 | if (call_analyzer->is_arg_returned(i - TypeFunc::Parms)) { |
kvn@742 | 2587 | ret_arg = true; |
kvn@679 | 2588 | PointsToNode *arg_esp = ptnode_adr(arg->_idx); |
kvn@500 | 2589 | if (arg_esp->node_type() == PointsToNode::UnknownType) |
kvn@500 | 2590 | done = false; |
kvn@500 | 2591 | else if (arg_esp->node_type() == PointsToNode::JavaObject) |
kvn@679 | 2592 | add_pointsto_edge(resproj_idx, arg->_idx); |
duke@435 | 2593 | else |
kvn@679 | 2594 | add_deferred_edge(resproj_idx, arg->_idx); |
duke@435 | 2595 | } |
duke@435 | 2596 | } |
duke@435 | 2597 | } |
kvn@3254 | 2598 | if (done) { |
kvn@3254 | 2599 | copy_dependencies = true; |
kvn@3318 | 2600 | // is_return_local() is true when only arguments are returned. |
kvn@3318 | 2601 | if (!ret_arg || !call_analyzer->is_return_local()) { |
kvn@3318 | 2602 | // Returns unknown object. |
kvn@3318 | 2603 | add_pointsto_edge(resproj_idx, _phantom_object); |
kvn@3318 | 2604 | } |
kvn@3254 | 2605 | } |
duke@435 | 2606 | } |
kvn@500 | 2607 | if (copy_dependencies) |
kvn@679 | 2608 | call_analyzer->copy_dependencies(_compile->dependencies()); |
duke@435 | 2609 | } |
kvn@500 | 2610 | if (done) |
kvn@679 | 2611 | _processed.set(resproj_idx); |
duke@435 | 2612 | break; |
duke@435 | 2613 | } |
duke@435 | 2614 | |
duke@435 | 2615 | default: |
duke@435 | 2616 | // Some other type of call, assume the worst case that the |
duke@435 | 2617 | // returned value, if any, globally escapes. |
duke@435 | 2618 | { |
duke@435 | 2619 | const TypeTuple *r = call->tf()->range(); |
duke@435 | 2620 | if (r->cnt() > TypeFunc::Parms) { |
duke@435 | 2621 | const Type* ret_type = r->field_at(TypeFunc::Parms); |
duke@435 | 2622 | |
duke@435 | 2623 | // Note: we use isa_ptr() instead of isa_oopptr() here because the |
duke@435 | 2624 | // _multianewarray functions return a TypeRawPtr. |
duke@435 | 2625 | if (ret_type->isa_ptr() != NULL) { |
kvn@679 | 2626 | set_escape_state(call_idx, PointsToNode::GlobalEscape); |
kvn@679 | 2627 | add_pointsto_edge(resproj_idx, _phantom_object); |
duke@435 | 2628 | } |
duke@435 | 2629 | } |
kvn@679 | 2630 | _processed.set(resproj_idx); |
duke@435 | 2631 | } |
duke@435 | 2632 | } |
duke@435 | 2633 | } |
duke@435 | 2634 | |
kvn@500 | 2635 | // Populate Connection Graph with Ideal nodes and create simple |
kvn@500 | 2636 | // connection graph edges (do not need to check the node_type of inputs |
kvn@500 | 2637 | // or to call PointsTo() to walk the connection graph). |
kvn@500 | 2638 | void ConnectionGraph::record_for_escape_analysis(Node *n, PhaseTransform *phase) { |
kvn@500 | 2639 | if (_processed.test(n->_idx)) |
kvn@500 | 2640 | return; // No need to redefine node's state. |
kvn@500 | 2641 | |
kvn@500 | 2642 | if (n->is_Call()) { |
kvn@500 | 2643 | // Arguments to allocation and locking don't escape. |
kvn@500 | 2644 | if (n->is_Allocate()) { |
kvn@500 | 2645 | add_node(n, PointsToNode::JavaObject, PointsToNode::UnknownEscape, true); |
kvn@500 | 2646 | record_for_optimizer(n); |
kvn@500 | 2647 | } else if (n->is_Lock() || n->is_Unlock()) { |
kvn@500 | 2648 | // Put Lock and Unlock nodes on IGVN worklist to process them during |
kvn@500 | 2649 | // the first IGVN optimization when escape information is still available. |
kvn@500 | 2650 | record_for_optimizer(n); |
kvn@500 | 2651 | _processed.set(n->_idx); |
kvn@500 | 2652 | } else { |
kvn@1535 | 2653 | // Don't mark as processed since call's arguments have to be processed. |
kvn@500 | 2654 | PointsToNode::NodeType nt = PointsToNode::UnknownType; |
kvn@1535 | 2655 | PointsToNode::EscapeState es = PointsToNode::UnknownEscape; |
kvn@500 | 2656 | |
kvn@500 | 2657 | // Check if a call returns an object. |
kvn@500 | 2658 | const TypeTuple *r = n->as_Call()->tf()->range(); |
kvn@1535 | 2659 | if (r->cnt() > TypeFunc::Parms && |
kvn@1535 | 2660 | r->field_at(TypeFunc::Parms)->isa_ptr() && |
kvn@500 | 2661 | n->as_Call()->proj_out(TypeFunc::Parms) != NULL) { |
kvn@1535 | 2662 | nt = PointsToNode::JavaObject; |
kvn@1535 | 2663 | if (!n->is_CallStaticJava()) { |
kvn@1535 | 2664 | // Since the called mathod is statically unknown assume |
kvn@1535 | 2665 | // the worst case that the returned value globally escapes. |
kvn@1535 | 2666 | es = PointsToNode::GlobalEscape; |
kvn@500 | 2667 | } |
duke@435 | 2668 | } |
kvn@1535 | 2669 | add_node(n, nt, es, false); |
duke@435 | 2670 | } |
kvn@500 | 2671 | return; |
duke@435 | 2672 | } |
kvn@500 | 2673 | |
kvn@500 | 2674 | // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because |
kvn@500 | 2675 | // ThreadLocal has RawPrt type. |
kvn@500 | 2676 | switch (n->Opcode()) { |
kvn@500 | 2677 | case Op_AddP: |
kvn@500 | 2678 | { |
kvn@500 | 2679 | add_node(n, PointsToNode::Field, PointsToNode::UnknownEscape, false); |
kvn@500 | 2680 | break; |
kvn@500 | 2681 | } |
kvn@500 | 2682 | case Op_CastX2P: |
kvn@500 | 2683 | { // "Unsafe" memory access. |
kvn@500 | 2684 | add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); |
kvn@500 | 2685 | break; |
kvn@500 | 2686 | } |
kvn@500 | 2687 | case Op_CastPP: |
kvn@500 | 2688 | case Op_CheckCastPP: |
kvn@559 | 2689 | case Op_EncodeP: |
kvn@559 | 2690 | case Op_DecodeN: |
kvn@500 | 2691 | { |
kvn@500 | 2692 | add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); |
kvn@500 | 2693 | int ti = n->in(1)->_idx; |
kvn@679 | 2694 | PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
kvn@500 | 2695 | if (nt == PointsToNode::UnknownType) { |
kvn@500 | 2696 | _delayed_worklist.push(n); // Process it later. |
kvn@500 | 2697 | break; |
kvn@500 | 2698 | } else if (nt == PointsToNode::JavaObject) { |
kvn@500 | 2699 | add_pointsto_edge(n->_idx, ti); |
kvn@500 | 2700 | } else { |
kvn@500 | 2701 | add_deferred_edge(n->_idx, ti); |
kvn@500 | 2702 | } |
kvn@500 | 2703 | _processed.set(n->_idx); |
kvn@500 | 2704 | break; |
kvn@500 | 2705 | } |
kvn@500 | 2706 | case Op_ConP: |
kvn@500 | 2707 | { |
kvn@500 | 2708 | // assume all pointer constants globally escape except for null |
kvn@500 | 2709 | PointsToNode::EscapeState es; |
kvn@500 | 2710 | if (phase->type(n) == TypePtr::NULL_PTR) |
kvn@500 | 2711 | es = PointsToNode::NoEscape; |
kvn@500 | 2712 | else |
kvn@500 | 2713 | es = PointsToNode::GlobalEscape; |
kvn@500 | 2714 | |
kvn@500 | 2715 | add_node(n, PointsToNode::JavaObject, es, true); |
kvn@500 | 2716 | break; |
kvn@500 | 2717 | } |
coleenp@548 | 2718 | case Op_ConN: |
coleenp@548 | 2719 | { |
coleenp@548 | 2720 | // assume all narrow oop constants globally escape except for null |
coleenp@548 | 2721 | PointsToNode::EscapeState es; |
coleenp@548 | 2722 | if (phase->type(n) == TypeNarrowOop::NULL_PTR) |
coleenp@548 | 2723 | es = PointsToNode::NoEscape; |
coleenp@548 | 2724 | else |
coleenp@548 | 2725 | es = PointsToNode::GlobalEscape; |
coleenp@548 | 2726 | |
coleenp@548 | 2727 | add_node(n, PointsToNode::JavaObject, es, true); |
coleenp@548 | 2728 | break; |
coleenp@548 | 2729 | } |
kvn@559 | 2730 | case Op_CreateEx: |
kvn@559 | 2731 | { |
kvn@559 | 2732 | // assume that all exception objects globally escape |
kvn@559 | 2733 | add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); |
kvn@559 | 2734 | break; |
kvn@559 | 2735 | } |
kvn@500 | 2736 | case Op_LoadKlass: |
kvn@599 | 2737 | case Op_LoadNKlass: |
kvn@500 | 2738 | { |
kvn@500 | 2739 | add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); |
kvn@500 | 2740 | break; |
kvn@500 | 2741 | } |
kvn@500 | 2742 | case Op_LoadP: |
coleenp@548 | 2743 | case Op_LoadN: |
kvn@500 | 2744 | { |
kvn@500 | 2745 | const Type *t = phase->type(n); |
kvn@688 | 2746 | if (t->make_ptr() == NULL) { |
kvn@500 | 2747 | _processed.set(n->_idx); |
kvn@500 | 2748 | return; |
kvn@500 | 2749 | } |
kvn@500 | 2750 | add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); |
kvn@500 | 2751 | break; |
kvn@500 | 2752 | } |
kvn@500 | 2753 | case Op_Parm: |
kvn@500 | 2754 | { |
kvn@500 | 2755 | _processed.set(n->_idx); // No need to redefine it state. |
kvn@500 | 2756 | uint con = n->as_Proj()->_con; |
kvn@500 | 2757 | if (con < TypeFunc::Parms) |
kvn@500 | 2758 | return; |
kvn@500 | 2759 | const Type *t = n->in(0)->as_Start()->_domain->field_at(con); |
kvn@500 | 2760 | if (t->isa_ptr() == NULL) |
kvn@500 | 2761 | return; |
kvn@500 | 2762 | // We have to assume all input parameters globally escape |
kvn@500 | 2763 | // (Note: passing 'false' since _processed is already set). |
kvn@500 | 2764 | add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, false); |
kvn@500 | 2765 | break; |
kvn@500 | 2766 | } |
kvn@3309 | 2767 | case Op_PartialSubtypeCheck: |
kvn@3309 | 2768 | { // Produces Null or notNull and is used in CmpP. |
kvn@3309 | 2769 | add_node(n, PointsToNode::JavaObject, PointsToNode::ArgEscape, true); |
kvn@3309 | 2770 | break; |
kvn@3309 | 2771 | } |
kvn@500 | 2772 | case Op_Phi: |
kvn@500 | 2773 | { |
kvn@688 | 2774 | const Type *t = n->as_Phi()->type(); |
kvn@688 | 2775 | if (t->make_ptr() == NULL) { |
kvn@688 | 2776 | // nothing to do if not an oop or narrow oop |
kvn@500 | 2777 | _processed.set(n->_idx); |
kvn@500 | 2778 | return; |
kvn@500 | 2779 | } |
kvn@500 | 2780 | add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); |
kvn@500 | 2781 | uint i; |
kvn@500 | 2782 | for (i = 1; i < n->req() ; i++) { |
kvn@500 | 2783 | Node* in = n->in(i); |
kvn@500 | 2784 | if (in == NULL) |
kvn@500 | 2785 | continue; // ignore NULL |
kvn@500 | 2786 | in = in->uncast(); |
kvn@500 | 2787 | if (in->is_top() || in == n) |
kvn@500 | 2788 | continue; // ignore top or inputs which go back this node |
kvn@500 | 2789 | int ti = in->_idx; |
kvn@679 | 2790 | PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
kvn@500 | 2791 | if (nt == PointsToNode::UnknownType) { |
kvn@500 | 2792 | break; |
kvn@500 | 2793 | } else if (nt == PointsToNode::JavaObject) { |
kvn@500 | 2794 | add_pointsto_edge(n->_idx, ti); |
kvn@500 | 2795 | } else { |
kvn@500 | 2796 | add_deferred_edge(n->_idx, ti); |
kvn@500 | 2797 | } |
kvn@500 | 2798 | } |
kvn@500 | 2799 | if (i >= n->req()) |
kvn@500 | 2800 | _processed.set(n->_idx); |
kvn@500 | 2801 | else |
kvn@500 | 2802 | _delayed_worklist.push(n); |
kvn@500 | 2803 | break; |
kvn@500 | 2804 | } |
kvn@500 | 2805 | case Op_Proj: |
kvn@500 | 2806 | { |
kvn@1535 | 2807 | // we are only interested in the oop result projection from a call |
kvn@500 | 2808 | if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { |
kvn@1535 | 2809 | const TypeTuple *r = n->in(0)->as_Call()->tf()->range(); |
kvn@1535 | 2810 | assert(r->cnt() > TypeFunc::Parms, "sanity"); |
kvn@1535 | 2811 | if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) { |
kvn@1535 | 2812 | add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); |
kvn@1535 | 2813 | int ti = n->in(0)->_idx; |
kvn@1535 | 2814 | // The call may not be registered yet (since not all its inputs are registered) |
kvn@1535 | 2815 | // if this is the projection from backbranch edge of Phi. |
kvn@1535 | 2816 | if (ptnode_adr(ti)->node_type() != PointsToNode::UnknownType) { |
kvn@1535 | 2817 | process_call_result(n->as_Proj(), phase); |
kvn@1535 | 2818 | } |
kvn@1535 | 2819 | if (!_processed.test(n->_idx)) { |
kvn@1535 | 2820 | // The call's result may need to be processed later if the call |
kvn@1535 | 2821 | // returns it's argument and the argument is not processed yet. |
kvn@1535 | 2822 | _delayed_worklist.push(n); |
kvn@1535 | 2823 | } |
kvn@1535 | 2824 | break; |
kvn@500 | 2825 | } |
kvn@500 | 2826 | } |
kvn@1535 | 2827 | _processed.set(n->_idx); |
kvn@500 | 2828 | break; |
kvn@500 | 2829 | } |
kvn@500 | 2830 | case Op_Return: |
kvn@500 | 2831 | { |
kvn@500 | 2832 | if( n->req() > TypeFunc::Parms && |
kvn@500 | 2833 | phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { |
kvn@500 | 2834 | // Treat Return value as LocalVar with GlobalEscape escape state. |
kvn@500 | 2835 | add_node(n, PointsToNode::LocalVar, PointsToNode::GlobalEscape, false); |
kvn@500 | 2836 | int ti = n->in(TypeFunc::Parms)->_idx; |
kvn@679 | 2837 | PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
kvn@500 | 2838 | if (nt == PointsToNode::UnknownType) { |
kvn@500 | 2839 | _delayed_worklist.push(n); // Process it later. |
kvn@500 | 2840 | break; |
kvn@500 | 2841 | } else if (nt == PointsToNode::JavaObject) { |
kvn@500 | 2842 | add_pointsto_edge(n->_idx, ti); |
kvn@500 | 2843 | } else { |
kvn@500 | 2844 | add_deferred_edge(n->_idx, ti); |
kvn@500 | 2845 | } |
kvn@500 | 2846 | } |
kvn@500 | 2847 | _processed.set(n->_idx); |
kvn@500 | 2848 | break; |
kvn@500 | 2849 | } |
kvn@500 | 2850 | case Op_StoreP: |
coleenp@548 | 2851 | case Op_StoreN: |
kvn@500 | 2852 | { |
kvn@500 | 2853 | const Type *adr_type = phase->type(n->in(MemNode::Address)); |
kvn@656 | 2854 | adr_type = adr_type->make_ptr(); |
kvn@500 | 2855 | if (adr_type->isa_oopptr()) { |
kvn@500 | 2856 | add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); |
kvn@500 | 2857 | } else { |
kvn@500 | 2858 | Node* adr = n->in(MemNode::Address); |
kvn@500 | 2859 | if (adr->is_AddP() && phase->type(adr) == TypeRawPtr::NOTNULL && |
kvn@500 | 2860 | adr->in(AddPNode::Address)->is_Proj() && |
kvn@500 | 2861 | adr->in(AddPNode::Address)->in(0)->is_Allocate()) { |
kvn@500 | 2862 | add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); |
kvn@500 | 2863 | // We are computing a raw address for a store captured |
kvn@500 | 2864 | // by an Initialize compute an appropriate address type. |
kvn@500 | 2865 | int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); |
kvn@500 | 2866 | assert(offs != Type::OffsetBot, "offset must be a constant"); |
kvn@500 | 2867 | } else { |
kvn@500 | 2868 | _processed.set(n->_idx); |
kvn@500 | 2869 | return; |
kvn@500 | 2870 | } |
kvn@500 | 2871 | } |
kvn@500 | 2872 | break; |
kvn@500 | 2873 | } |
kvn@500 | 2874 | case Op_StorePConditional: |
kvn@500 | 2875 | case Op_CompareAndSwapP: |
coleenp@548 | 2876 | case Op_CompareAndSwapN: |
kvn@500 | 2877 | { |
kvn@500 | 2878 | const Type *adr_type = phase->type(n->in(MemNode::Address)); |
kvn@656 | 2879 | adr_type = adr_type->make_ptr(); |
kvn@500 | 2880 | if (adr_type->isa_oopptr()) { |
kvn@500 | 2881 | add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); |
kvn@500 | 2882 | } else { |
kvn@500 | 2883 | _processed.set(n->_idx); |
kvn@500 | 2884 | return; |
kvn@500 | 2885 | } |
kvn@500 | 2886 | break; |
kvn@500 | 2887 | } |
kvn@1535 | 2888 | case Op_AryEq: |
kvn@1535 | 2889 | case Op_StrComp: |
kvn@1535 | 2890 | case Op_StrEquals: |
kvn@1535 | 2891 | case Op_StrIndexOf: |
kvn@1535 | 2892 | { |
kvn@1535 | 2893 | // char[] arrays passed to string intrinsics are not scalar replaceable. |
kvn@1535 | 2894 | add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); |
kvn@1535 | 2895 | break; |
kvn@1535 | 2896 | } |
kvn@500 | 2897 | case Op_ThreadLocal: |
kvn@500 | 2898 | { |
kvn@500 | 2899 | add_node(n, PointsToNode::JavaObject, PointsToNode::ArgEscape, true); |
kvn@500 | 2900 | break; |
kvn@500 | 2901 | } |
kvn@500 | 2902 | default: |
kvn@500 | 2903 | ; |
kvn@500 | 2904 | // nothing to do |
kvn@500 | 2905 | } |
kvn@500 | 2906 | return; |
duke@435 | 2907 | } |
duke@435 | 2908 | |
kvn@500 | 2909 | void ConnectionGraph::build_connection_graph(Node *n, PhaseTransform *phase) { |
kvn@679 | 2910 | uint n_idx = n->_idx; |
kvn@1535 | 2911 | assert(ptnode_adr(n_idx)->_node != NULL, "node should be registered"); |
kvn@679 | 2912 | |
kvn@500 | 2913 | // Don't set processed bit for AddP, LoadP, StoreP since |
kvn@500 | 2914 | // they may need more then one pass to process. |
kvn@2276 | 2915 | // Also don't mark as processed Call nodes since their |
kvn@2276 | 2916 | // arguments may need more then one pass to process. |
kvn@679 | 2917 | if (_processed.test(n_idx)) |
kvn@500 | 2918 | return; // No need to redefine node's state. |
duke@435 | 2919 | |
duke@435 | 2920 | if (n->is_Call()) { |
duke@435 | 2921 | CallNode *call = n->as_Call(); |
duke@435 | 2922 | process_call_arguments(call, phase); |
duke@435 | 2923 | return; |
duke@435 | 2924 | } |
duke@435 | 2925 | |
kvn@500 | 2926 | switch (n->Opcode()) { |
duke@435 | 2927 | case Op_AddP: |
duke@435 | 2928 | { |
kvn@500 | 2929 | Node *base = get_addp_base(n); |
kvn@3309 | 2930 | int offset = address_offset(n, phase); |
kvn@500 | 2931 | // Create a field edge to this node from everything base could point to. |
kvn@2556 | 2932 | for( VectorSetI i(PointsTo(base)); i.test(); ++i ) { |
duke@435 | 2933 | uint pt = i.elem; |
kvn@3309 | 2934 | add_field_edge(pt, n_idx, offset); |
kvn@500 | 2935 | } |
kvn@500 | 2936 | break; |
kvn@500 | 2937 | } |
kvn@500 | 2938 | case Op_CastX2P: |
kvn@500 | 2939 | { |
kvn@500 | 2940 | assert(false, "Op_CastX2P"); |
kvn@500 | 2941 | break; |
kvn@500 | 2942 | } |
kvn@500 | 2943 | case Op_CastPP: |
kvn@500 | 2944 | case Op_CheckCastPP: |
coleenp@548 | 2945 | case Op_EncodeP: |
coleenp@548 | 2946 | case Op_DecodeN: |
kvn@500 | 2947 | { |
kvn@500 | 2948 | int ti = n->in(1)->_idx; |
kvn@1535 | 2949 | assert(ptnode_adr(ti)->node_type() != PointsToNode::UnknownType, "all nodes should be registered"); |
kvn@679 | 2950 | if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) { |
kvn@679 | 2951 | add_pointsto_edge(n_idx, ti); |
kvn@500 | 2952 | } else { |
kvn@679 | 2953 | add_deferred_edge(n_idx, ti); |
kvn@500 | 2954 | } |
kvn@679 | 2955 | _processed.set(n_idx); |
kvn@500 | 2956 | break; |
kvn@500 | 2957 | } |
kvn@500 | 2958 | case Op_ConP: |
kvn@500 | 2959 | { |
kvn@500 | 2960 | assert(false, "Op_ConP"); |
kvn@500 | 2961 | break; |
kvn@500 | 2962 | } |
kvn@598 | 2963 | case Op_ConN: |
kvn@598 | 2964 | { |
kvn@598 | 2965 | assert(false, "Op_ConN"); |
kvn@598 | 2966 | break; |
kvn@598 | 2967 | } |
kvn@500 | 2968 | case Op_CreateEx: |
kvn@500 | 2969 | { |
kvn@500 | 2970 | assert(false, "Op_CreateEx"); |
kvn@500 | 2971 | break; |
kvn@500 | 2972 | } |
kvn@500 | 2973 | case Op_LoadKlass: |
kvn@599 | 2974 | case Op_LoadNKlass: |
kvn@500 | 2975 | { |
kvn@500 | 2976 | assert(false, "Op_LoadKlass"); |
kvn@500 | 2977 | break; |
kvn@500 | 2978 | } |
kvn@500 | 2979 | case Op_LoadP: |
kvn@559 | 2980 | case Op_LoadN: |
kvn@500 | 2981 | { |
kvn@500 | 2982 | const Type *t = phase->type(n); |
kvn@500 | 2983 | #ifdef ASSERT |
kvn@688 | 2984 | if (t->make_ptr() == NULL) |
kvn@500 | 2985 | assert(false, "Op_LoadP"); |
kvn@500 | 2986 | #endif |
kvn@500 | 2987 | |
kvn@500 | 2988 | Node* adr = n->in(MemNode::Address)->uncast(); |
kvn@500 | 2989 | Node* adr_base; |
kvn@500 | 2990 | if (adr->is_AddP()) { |
kvn@500 | 2991 | adr_base = get_addp_base(adr); |
kvn@500 | 2992 | } else { |
kvn@500 | 2993 | adr_base = adr; |
kvn@500 | 2994 | } |
kvn@500 | 2995 | |
kvn@500 | 2996 | // For everything "adr_base" could point to, create a deferred edge from |
kvn@500 | 2997 | // this node to each field with the same offset. |
kvn@500 | 2998 | int offset = address_offset(adr, phase); |
kvn@2556 | 2999 | for( VectorSetI i(PointsTo(adr_base)); i.test(); ++i ) { |
kvn@500 | 3000 | uint pt = i.elem; |
kvn@3309 | 3001 | if (adr->is_AddP()) { |
kvn@3309 | 3002 | // Add field edge if it is missing. |
kvn@3309 | 3003 | add_field_edge(pt, adr->_idx, offset); |
kvn@3309 | 3004 | } |
kvn@679 | 3005 | add_deferred_edge_to_fields(n_idx, pt, offset); |
duke@435 | 3006 | } |
duke@435 | 3007 | break; |
duke@435 | 3008 | } |
duke@435 | 3009 | case Op_Parm: |
duke@435 | 3010 | { |
kvn@500 | 3011 | assert(false, "Op_Parm"); |
kvn@500 | 3012 | break; |
kvn@500 | 3013 | } |
kvn@3309 | 3014 | case Op_PartialSubtypeCheck: |
kvn@3309 | 3015 | { |
kvn@3309 | 3016 | assert(false, "Op_PartialSubtypeCheck"); |
kvn@3309 | 3017 | break; |
kvn@3309 | 3018 | } |
kvn@500 | 3019 | case Op_Phi: |
kvn@500 | 3020 | { |
kvn@500 | 3021 | #ifdef ASSERT |
kvn@688 | 3022 | const Type *t = n->as_Phi()->type(); |
kvn@688 | 3023 | if (t->make_ptr() == NULL) |
kvn@500 | 3024 | assert(false, "Op_Phi"); |
kvn@500 | 3025 | #endif |
kvn@500 | 3026 | for (uint i = 1; i < n->req() ; i++) { |
kvn@500 | 3027 | Node* in = n->in(i); |
kvn@500 | 3028 | if (in == NULL) |
kvn@500 | 3029 | continue; // ignore NULL |
kvn@500 | 3030 | in = in->uncast(); |
kvn@500 | 3031 | if (in->is_top() || in == n) |
kvn@500 | 3032 | continue; // ignore top or inputs which go back this node |
kvn@500 | 3033 | int ti = in->_idx; |
kvn@742 | 3034 | PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
kvn@742 | 3035 | assert(nt != PointsToNode::UnknownType, "all nodes should be known"); |
kvn@742 | 3036 | if (nt == PointsToNode::JavaObject) { |
kvn@679 | 3037 | add_pointsto_edge(n_idx, ti); |
kvn@500 | 3038 | } else { |
kvn@679 | 3039 | add_deferred_edge(n_idx, ti); |
kvn@500 | 3040 | } |
duke@435 | 3041 | } |
kvn@679 | 3042 | _processed.set(n_idx); |
duke@435 | 3043 | break; |
duke@435 | 3044 | } |
kvn@500 | 3045 | case Op_Proj: |
duke@435 | 3046 | { |
kvn@1535 | 3047 | // we are only interested in the oop result projection from a call |
kvn@500 | 3048 | if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { |
kvn@1535 | 3049 | assert(ptnode_adr(n->in(0)->_idx)->node_type() != PointsToNode::UnknownType, |
kvn@1535 | 3050 | "all nodes should be registered"); |
kvn@1535 | 3051 | const TypeTuple *r = n->in(0)->as_Call()->tf()->range(); |
kvn@1535 | 3052 | assert(r->cnt() > TypeFunc::Parms, "sanity"); |
kvn@1535 | 3053 | if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) { |
kvn@1535 | 3054 | process_call_result(n->as_Proj(), phase); |
kvn@1535 | 3055 | assert(_processed.test(n_idx), "all call results should be processed"); |
kvn@1535 | 3056 | break; |
kvn@1535 | 3057 | } |
kvn@500 | 3058 | } |
kvn@1535 | 3059 | assert(false, "Op_Proj"); |
duke@435 | 3060 | break; |
duke@435 | 3061 | } |
kvn@500 | 3062 | case Op_Return: |
duke@435 | 3063 | { |
kvn@500 | 3064 | #ifdef ASSERT |
kvn@500 | 3065 | if( n->req() <= TypeFunc::Parms || |
kvn@500 | 3066 | !phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { |
kvn@500 | 3067 | assert(false, "Op_Return"); |
kvn@500 | 3068 | } |
kvn@500 | 3069 | #endif |
kvn@500 | 3070 | int ti = n->in(TypeFunc::Parms)->_idx; |
kvn@1535 | 3071 | assert(ptnode_adr(ti)->node_type() != PointsToNode::UnknownType, "node should be registered"); |
kvn@679 | 3072 | if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) { |
kvn@679 | 3073 | add_pointsto_edge(n_idx, ti); |
kvn@500 | 3074 | } else { |
kvn@679 | 3075 | add_deferred_edge(n_idx, ti); |
kvn@500 | 3076 | } |
kvn@679 | 3077 | _processed.set(n_idx); |
duke@435 | 3078 | break; |
duke@435 | 3079 | } |
duke@435 | 3080 | case Op_StoreP: |
kvn@559 | 3081 | case Op_StoreN: |
duke@435 | 3082 | case Op_StorePConditional: |
duke@435 | 3083 | case Op_CompareAndSwapP: |
kvn@559 | 3084 | case Op_CompareAndSwapN: |
duke@435 | 3085 | { |
duke@435 | 3086 | Node *adr = n->in(MemNode::Address); |
kvn@656 | 3087 | const Type *adr_type = phase->type(adr)->make_ptr(); |
kvn@500 | 3088 | #ifdef ASSERT |
duke@435 | 3089 | if (!adr_type->isa_oopptr()) |
kvn@500 | 3090 | assert(phase->type(adr) == TypeRawPtr::NOTNULL, "Op_StoreP"); |
kvn@500 | 3091 | #endif |
duke@435 | 3092 | |
kvn@500 | 3093 | assert(adr->is_AddP(), "expecting an AddP"); |
kvn@500 | 3094 | Node *adr_base = get_addp_base(adr); |
kvn@500 | 3095 | Node *val = n->in(MemNode::ValueIn)->uncast(); |
kvn@3309 | 3096 | int offset = address_offset(adr, phase); |
kvn@500 | 3097 | // For everything "adr_base" could point to, create a deferred edge |
kvn@500 | 3098 | // to "val" from each field with the same offset. |
kvn@2556 | 3099 | for( VectorSetI i(PointsTo(adr_base)); i.test(); ++i ) { |
duke@435 | 3100 | uint pt = i.elem; |
kvn@3309 | 3101 | // Add field edge if it is missing. |
kvn@3309 | 3102 | add_field_edge(pt, adr->_idx, offset); |
kvn@3309 | 3103 | add_edge_from_fields(pt, val->_idx, offset); |
duke@435 | 3104 | } |
duke@435 | 3105 | break; |
duke@435 | 3106 | } |
kvn@1535 | 3107 | case Op_AryEq: |
kvn@1535 | 3108 | case Op_StrComp: |
kvn@1535 | 3109 | case Op_StrEquals: |
kvn@1535 | 3110 | case Op_StrIndexOf: |
kvn@1535 | 3111 | { |
kvn@1535 | 3112 | // char[] arrays passed to string intrinsic do not escape but |
kvn@1535 | 3113 | // they are not scalar replaceable. Adjust escape state for them. |
kvn@1535 | 3114 | // Start from in(2) edge since in(1) is memory edge. |
kvn@1535 | 3115 | for (uint i = 2; i < n->req(); i++) { |
kvn@1535 | 3116 | Node* adr = n->in(i)->uncast(); |
kvn@1535 | 3117 | const Type *at = phase->type(adr); |
kvn@1535 | 3118 | if (!adr->is_top() && at->isa_ptr()) { |
kvn@1535 | 3119 | assert(at == Type::TOP || at == TypePtr::NULL_PTR || |
kvn@1535 | 3120 | at->isa_ptr() != NULL, "expecting an Ptr"); |
kvn@1535 | 3121 | if (adr->is_AddP()) { |
kvn@1535 | 3122 | adr = get_addp_base(adr); |
kvn@1535 | 3123 | } |
kvn@1535 | 3124 | // Mark as ArgEscape everything "adr" could point to. |
kvn@1535 | 3125 | set_escape_state(adr->_idx, PointsToNode::ArgEscape); |
kvn@1535 | 3126 | } |
kvn@1535 | 3127 | } |
kvn@1535 | 3128 | _processed.set(n_idx); |
kvn@1535 | 3129 | break; |
kvn@1535 | 3130 | } |
kvn@500 | 3131 | case Op_ThreadLocal: |
duke@435 | 3132 | { |
kvn@500 | 3133 | assert(false, "Op_ThreadLocal"); |
duke@435 | 3134 | break; |
duke@435 | 3135 | } |
duke@435 | 3136 | default: |
kvn@1535 | 3137 | // This method should be called only for EA specific nodes. |
kvn@1535 | 3138 | ShouldNotReachHere(); |
duke@435 | 3139 | } |
duke@435 | 3140 | } |
duke@435 | 3141 | |
duke@435 | 3142 | #ifndef PRODUCT |
duke@435 | 3143 | void ConnectionGraph::dump() { |
duke@435 | 3144 | bool first = true; |
duke@435 | 3145 | |
kvn@679 | 3146 | uint size = nodes_size(); |
kvn@500 | 3147 | for (uint ni = 0; ni < size; ni++) { |
kvn@679 | 3148 | PointsToNode *ptn = ptnode_adr(ni); |
kvn@500 | 3149 | PointsToNode::NodeType ptn_type = ptn->node_type(); |
kvn@500 | 3150 | |
kvn@500 | 3151 | if (ptn_type != PointsToNode::JavaObject || ptn->_node == NULL) |
duke@435 | 3152 | continue; |
kvn@1989 | 3153 | PointsToNode::EscapeState es = escape_state(ptn->_node); |
kvn@500 | 3154 | if (ptn->_node->is_Allocate() && (es == PointsToNode::NoEscape || Verbose)) { |
kvn@500 | 3155 | if (first) { |
kvn@500 | 3156 | tty->cr(); |
kvn@500 | 3157 | tty->print("======== Connection graph for "); |
kvn@679 | 3158 | _compile->method()->print_short_name(); |
kvn@500 | 3159 | tty->cr(); |
kvn@500 | 3160 | first = false; |
kvn@500 | 3161 | } |
kvn@500 | 3162 | tty->print("%6d ", ni); |
kvn@500 | 3163 | ptn->dump(); |
kvn@500 | 3164 | // Print all locals which reference this allocation |
kvn@500 | 3165 | for (uint li = ni; li < size; li++) { |
kvn@679 | 3166 | PointsToNode *ptn_loc = ptnode_adr(li); |
kvn@500 | 3167 | PointsToNode::NodeType ptn_loc_type = ptn_loc->node_type(); |
kvn@500 | 3168 | if ( ptn_loc_type == PointsToNode::LocalVar && ptn_loc->_node != NULL && |
kvn@500 | 3169 | ptn_loc->edge_count() == 1 && ptn_loc->edge_target(0) == ni ) { |
kvn@688 | 3170 | ptnode_adr(li)->dump(false); |
duke@435 | 3171 | } |
duke@435 | 3172 | } |
kvn@500 | 3173 | if (Verbose) { |
kvn@500 | 3174 | // Print all fields which reference this allocation |
kvn@500 | 3175 | for (uint i = 0; i < ptn->edge_count(); i++) { |
kvn@500 | 3176 | uint ei = ptn->edge_target(i); |
kvn@688 | 3177 | ptnode_adr(ei)->dump(false); |
kvn@500 | 3178 | } |
kvn@500 | 3179 | } |
kvn@500 | 3180 | tty->cr(); |
duke@435 | 3181 | } |
duke@435 | 3182 | } |
duke@435 | 3183 | } |
duke@435 | 3184 | #endif |