Mercurial > hg > graal-compiler
annotate src/share/vm/opto/escape.cpp @ 893:dd0a4e1e219b
6851386: assert(b->find_node(def) < j,"uses must follow definitions")
Summary: Add additional check for a tight loop.
Reviewed-by: never
author | kvn |
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date | Sun, 26 Jul 2009 12:59:41 -0700 |
parents | fc4be448891f |
children | 18f526145aea |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_escape.cpp.incl" | |
27 | |
28 void PointsToNode::add_edge(uint targIdx, PointsToNode::EdgeType et) { | |
29 uint v = (targIdx << EdgeShift) + ((uint) et); | |
30 if (_edges == NULL) { | |
31 Arena *a = Compile::current()->comp_arena(); | |
32 _edges = new(a) GrowableArray<uint>(a, INITIAL_EDGE_COUNT, 0, 0); | |
33 } | |
34 _edges->append_if_missing(v); | |
35 } | |
36 | |
37 void PointsToNode::remove_edge(uint targIdx, PointsToNode::EdgeType et) { | |
38 uint v = (targIdx << EdgeShift) + ((uint) et); | |
39 | |
40 _edges->remove(v); | |
41 } | |
42 | |
43 #ifndef PRODUCT | |
77 | 44 static const char *node_type_names[] = { |
0 | 45 "UnknownType", |
46 "JavaObject", | |
47 "LocalVar", | |
48 "Field" | |
49 }; | |
50 | |
77 | 51 static const char *esc_names[] = { |
0 | 52 "UnknownEscape", |
65 | 53 "NoEscape", |
54 "ArgEscape", | |
55 "GlobalEscape" | |
0 | 56 }; |
57 | |
77 | 58 static const char *edge_type_suffix[] = { |
0 | 59 "?", // UnknownEdge |
60 "P", // PointsToEdge | |
61 "D", // DeferredEdge | |
62 "F" // FieldEdge | |
63 }; | |
64 | |
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65 void PointsToNode::dump(bool print_state) const { |
0 | 66 NodeType nt = node_type(); |
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67 tty->print("%s ", node_type_names[(int) nt]); |
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68 if (print_state) { |
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69 EscapeState es = escape_state(); |
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70 tty->print("%s %s ", esc_names[(int) es], _scalar_replaceable ? "":"NSR"); |
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71 } |
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72 tty->print("[["); |
0 | 73 for (uint i = 0; i < edge_count(); i++) { |
74 tty->print(" %d%s", edge_target(i), edge_type_suffix[(int) edge_type(i)]); | |
75 } | |
76 tty->print("]] "); | |
77 if (_node == NULL) | |
78 tty->print_cr("<null>"); | |
79 else | |
80 _node->dump(); | |
81 } | |
82 #endif | |
83 | |
244
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84 ConnectionGraph::ConnectionGraph(Compile * C) : |
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85 _nodes(C->comp_arena(), C->unique(), C->unique(), PointsToNode()), |
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86 _processed(C->comp_arena()), |
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87 _collecting(true), |
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88 _compile(C), |
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89 _node_map(C->comp_arena()) { |
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90 |
253
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91 _phantom_object = C->top()->_idx, |
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92 add_node(C->top(), PointsToNode::JavaObject, PointsToNode::GlobalEscape,true); |
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93 |
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94 // Add ConP(#NULL) and ConN(#NULL) nodes. |
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95 PhaseGVN* igvn = C->initial_gvn(); |
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96 Node* oop_null = igvn->zerocon(T_OBJECT); |
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97 _oop_null = oop_null->_idx; |
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98 assert(_oop_null < C->unique(), "should be created already"); |
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99 add_node(oop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true); |
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100 |
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101 if (UseCompressedOops) { |
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102 Node* noop_null = igvn->zerocon(T_NARROWOOP); |
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103 _noop_null = noop_null->_idx; |
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104 assert(_noop_null < C->unique(), "should be created already"); |
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105 add_node(noop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true); |
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106 } |
0 | 107 } |
108 | |
109 void ConnectionGraph::add_pointsto_edge(uint from_i, uint to_i) { | |
110 PointsToNode *f = ptnode_adr(from_i); | |
111 PointsToNode *t = ptnode_adr(to_i); | |
112 | |
113 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
114 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of PointsTo edge"); | |
115 assert(t->node_type() == PointsToNode::JavaObject, "invalid destination of PointsTo edge"); | |
116 f->add_edge(to_i, PointsToNode::PointsToEdge); | |
117 } | |
118 | |
119 void ConnectionGraph::add_deferred_edge(uint from_i, uint to_i) { | |
120 PointsToNode *f = ptnode_adr(from_i); | |
121 PointsToNode *t = ptnode_adr(to_i); | |
122 | |
123 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
124 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of Deferred edge"); | |
125 assert(t->node_type() == PointsToNode::LocalVar || t->node_type() == PointsToNode::Field, "invalid destination of Deferred edge"); | |
126 // don't add a self-referential edge, this can occur during removal of | |
127 // deferred edges | |
128 if (from_i != to_i) | |
129 f->add_edge(to_i, PointsToNode::DeferredEdge); | |
130 } | |
131 | |
65 | 132 int ConnectionGraph::address_offset(Node* adr, PhaseTransform *phase) { |
133 const Type *adr_type = phase->type(adr); | |
134 if (adr->is_AddP() && adr_type->isa_oopptr() == NULL && | |
135 adr->in(AddPNode::Address)->is_Proj() && | |
136 adr->in(AddPNode::Address)->in(0)->is_Allocate()) { | |
137 // We are computing a raw address for a store captured by an Initialize | |
138 // compute an appropriate address type. AddP cases #3 and #5 (see below). | |
139 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); | |
140 assert(offs != Type::OffsetBot || | |
141 adr->in(AddPNode::Address)->in(0)->is_AllocateArray(), | |
142 "offset must be a constant or it is initialization of array"); | |
143 return offs; | |
144 } | |
145 const TypePtr *t_ptr = adr_type->isa_ptr(); | |
0 | 146 assert(t_ptr != NULL, "must be a pointer type"); |
147 return t_ptr->offset(); | |
148 } | |
149 | |
150 void ConnectionGraph::add_field_edge(uint from_i, uint to_i, int offset) { | |
151 PointsToNode *f = ptnode_adr(from_i); | |
152 PointsToNode *t = ptnode_adr(to_i); | |
153 | |
154 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
155 assert(f->node_type() == PointsToNode::JavaObject, "invalid destination of Field edge"); | |
156 assert(t->node_type() == PointsToNode::Field, "invalid destination of Field edge"); | |
157 assert (t->offset() == -1 || t->offset() == offset, "conflicting field offsets"); | |
158 t->set_offset(offset); | |
159 | |
160 f->add_edge(to_i, PointsToNode::FieldEdge); | |
161 } | |
162 | |
163 void ConnectionGraph::set_escape_state(uint ni, PointsToNode::EscapeState es) { | |
164 PointsToNode *npt = ptnode_adr(ni); | |
165 PointsToNode::EscapeState old_es = npt->escape_state(); | |
166 if (es > old_es) | |
167 npt->set_escape_state(es); | |
168 } | |
169 | |
65 | 170 void ConnectionGraph::add_node(Node *n, PointsToNode::NodeType nt, |
171 PointsToNode::EscapeState es, bool done) { | |
172 PointsToNode* ptadr = ptnode_adr(n->_idx); | |
173 ptadr->_node = n; | |
174 ptadr->set_node_type(nt); | |
175 | |
176 // inline set_escape_state(idx, es); | |
177 PointsToNode::EscapeState old_es = ptadr->escape_state(); | |
178 if (es > old_es) | |
179 ptadr->set_escape_state(es); | |
180 | |
181 if (done) | |
182 _processed.set(n->_idx); | |
183 } | |
184 | |
0 | 185 PointsToNode::EscapeState ConnectionGraph::escape_state(Node *n, PhaseTransform *phase) { |
186 uint idx = n->_idx; | |
187 PointsToNode::EscapeState es; | |
188 | |
65 | 189 // If we are still collecting or there were no non-escaping allocations |
190 // we don't know the answer yet | |
244
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191 if (_collecting) |
0 | 192 return PointsToNode::UnknownEscape; |
193 | |
194 // if the node was created after the escape computation, return | |
195 // UnknownEscape | |
244
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196 if (idx >= nodes_size()) |
0 | 197 return PointsToNode::UnknownEscape; |
198 | |
244
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199 es = ptnode_adr(idx)->escape_state(); |
0 | 200 |
201 // if we have already computed a value, return it | |
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202 if (es != PointsToNode::UnknownEscape && |
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203 ptnode_adr(idx)->node_type() == PointsToNode::JavaObject) |
0 | 204 return es; |
205 | |
244
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206 // PointsTo() calls n->uncast() which can return a new ideal node. |
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207 if (n->uncast()->_idx >= nodes_size()) |
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208 return PointsToNode::UnknownEscape; |
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209 |
0 | 210 // compute max escape state of anything this node could point to |
211 VectorSet ptset(Thread::current()->resource_area()); | |
212 PointsTo(ptset, n, phase); | |
65 | 213 for(VectorSetI i(&ptset); i.test() && es != PointsToNode::GlobalEscape; ++i) { |
0 | 214 uint pt = i.elem; |
244
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215 PointsToNode::EscapeState pes = ptnode_adr(pt)->escape_state(); |
0 | 216 if (pes > es) |
217 es = pes; | |
218 } | |
219 // cache the computed escape state | |
220 assert(es != PointsToNode::UnknownEscape, "should have computed an escape state"); | |
244
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221 ptnode_adr(idx)->set_escape_state(es); |
0 | 222 return es; |
223 } | |
224 | |
225 void ConnectionGraph::PointsTo(VectorSet &ptset, Node * n, PhaseTransform *phase) { | |
226 VectorSet visited(Thread::current()->resource_area()); | |
227 GrowableArray<uint> worklist; | |
228 | |
124
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229 #ifdef ASSERT |
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230 Node *orig_n = n; |
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231 #endif |
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232 |
65 | 233 n = n->uncast(); |
244
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234 PointsToNode* npt = ptnode_adr(n->_idx); |
0 | 235 |
236 // If we have a JavaObject, return just that object | |
244
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237 if (npt->node_type() == PointsToNode::JavaObject) { |
0 | 238 ptset.set(n->_idx); |
239 return; | |
240 } | |
124
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241 #ifdef ASSERT |
244
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242 if (npt->_node == NULL) { |
124
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243 if (orig_n != n) |
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244 orig_n->dump(); |
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245 n->dump(); |
244
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246 assert(npt->_node != NULL, "unregistered node"); |
124
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247 } |
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248 #endif |
0 | 249 worklist.push(n->_idx); |
250 while(worklist.length() > 0) { | |
251 int ni = worklist.pop(); | |
244
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252 if (visited.test_set(ni)) |
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253 continue; |
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254 |
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255 PointsToNode* pn = ptnode_adr(ni); |
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256 // ensure that all inputs of a Phi have been processed |
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257 assert(!_collecting || !pn->_node->is_Phi() || _processed.test(ni),""); |
0 | 258 |
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259 int edges_processed = 0; |
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260 uint e_cnt = pn->edge_count(); |
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261 for (uint e = 0; e < e_cnt; e++) { |
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262 uint etgt = pn->edge_target(e); |
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263 PointsToNode::EdgeType et = pn->edge_type(e); |
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264 if (et == PointsToNode::PointsToEdge) { |
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265 ptset.set(etgt); |
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266 edges_processed++; |
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267 } else if (et == PointsToNode::DeferredEdge) { |
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268 worklist.push(etgt); |
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269 edges_processed++; |
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270 } else { |
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271 assert(false,"neither PointsToEdge or DeferredEdge"); |
0 | 272 } |
244
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273 } |
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274 if (edges_processed == 0) { |
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275 // no deferred or pointsto edges found. Assume the value was set |
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276 // outside this method. Add the phantom object to the pointsto set. |
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277 ptset.set(_phantom_object); |
0 | 278 } |
279 } | |
280 } | |
281 | |
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282 void ConnectionGraph::remove_deferred(uint ni, GrowableArray<uint>* deferred_edges, VectorSet* visited) { |
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283 // This method is most expensive during ConnectionGraph construction. |
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284 // Reuse vectorSet and an additional growable array for deferred edges. |
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285 deferred_edges->clear(); |
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286 visited->Clear(); |
0 | 287 |
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288 visited->set(ni); |
0 | 289 PointsToNode *ptn = ptnode_adr(ni); |
290 | |
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291 // Mark current edges as visited and move deferred edges to separate array. |
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292 for (uint i = 0; i < ptn->edge_count(); ) { |
65 | 293 uint t = ptn->edge_target(i); |
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294 #ifdef ASSERT |
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295 assert(!visited->test_set(t), "expecting no duplications"); |
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296 #else |
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297 visited->set(t); |
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298 #endif |
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299 if (ptn->edge_type(i) == PointsToNode::DeferredEdge) { |
0 | 300 ptn->remove_edge(t, PointsToNode::DeferredEdge); |
101
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301 deferred_edges->append(t); |
124
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302 } else { |
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303 i++; |
101
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304 } |
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305 } |
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306 for (int next = 0; next < deferred_edges->length(); ++next) { |
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307 uint t = deferred_edges->at(next); |
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308 PointsToNode *ptt = ptnode_adr(t); |
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309 uint e_cnt = ptt->edge_count(); |
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310 for (uint e = 0; e < e_cnt; e++) { |
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311 uint etgt = ptt->edge_target(e); |
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312 if (visited->test_set(etgt)) |
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313 continue; |
244
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314 |
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315 PointsToNode::EdgeType et = ptt->edge_type(e); |
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316 if (et == PointsToNode::PointsToEdge) { |
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317 add_pointsto_edge(ni, etgt); |
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318 if(etgt == _phantom_object) { |
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319 // Special case - field set outside (globally escaping). |
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320 ptn->set_escape_state(PointsToNode::GlobalEscape); |
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321 } |
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322 } else if (et == PointsToNode::DeferredEdge) { |
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323 deferred_edges->append(etgt); |
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324 } else { |
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325 assert(false,"invalid connection graph"); |
0 | 326 } |
327 } | |
328 } | |
329 } | |
330 | |
331 | |
332 // Add an edge to node given by "to_i" from any field of adr_i whose offset | |
333 // matches "offset" A deferred edge is added if to_i is a LocalVar, and | |
334 // a pointsto edge is added if it is a JavaObject | |
335 | |
336 void ConnectionGraph::add_edge_from_fields(uint adr_i, uint to_i, int offs) { | |
244
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337 PointsToNode* an = ptnode_adr(adr_i); |
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338 PointsToNode* to = ptnode_adr(to_i); |
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339 bool deferred = (to->node_type() == PointsToNode::LocalVar); |
0 | 340 |
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341 for (uint fe = 0; fe < an->edge_count(); fe++) { |
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342 assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); |
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343 int fi = an->edge_target(fe); |
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344 PointsToNode* pf = ptnode_adr(fi); |
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345 int po = pf->offset(); |
0 | 346 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) { |
347 if (deferred) | |
348 add_deferred_edge(fi, to_i); | |
349 else | |
350 add_pointsto_edge(fi, to_i); | |
351 } | |
352 } | |
353 } | |
354 | |
65 | 355 // Add a deferred edge from node given by "from_i" to any field of adr_i |
356 // whose offset matches "offset". | |
0 | 357 void ConnectionGraph::add_deferred_edge_to_fields(uint from_i, uint adr_i, int offs) { |
244
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358 PointsToNode* an = ptnode_adr(adr_i); |
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359 for (uint fe = 0; fe < an->edge_count(); fe++) { |
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360 assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); |
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361 int fi = an->edge_target(fe); |
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362 PointsToNode* pf = ptnode_adr(fi); |
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363 int po = pf->offset(); |
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364 if (pf->edge_count() == 0) { |
0 | 365 // we have not seen any stores to this field, assume it was set outside this method |
366 add_pointsto_edge(fi, _phantom_object); | |
367 } | |
368 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) { | |
369 add_deferred_edge(from_i, fi); | |
370 } | |
371 } | |
372 } | |
373 | |
65 | 374 // Helper functions |
375 | |
376 static Node* get_addp_base(Node *addp) { | |
377 assert(addp->is_AddP(), "must be AddP"); | |
378 // | |
379 // AddP cases for Base and Address inputs: | |
380 // case #1. Direct object's field reference: | |
381 // Allocate | |
382 // | | |
383 // Proj #5 ( oop result ) | |
384 // | | |
385 // CheckCastPP (cast to instance type) | |
386 // | | | |
387 // AddP ( base == address ) | |
388 // | |
389 // case #2. Indirect object's field reference: | |
390 // Phi | |
391 // | | |
392 // CastPP (cast to instance type) | |
393 // | | | |
394 // AddP ( base == address ) | |
395 // | |
396 // case #3. Raw object's field reference for Initialize node: | |
397 // Allocate | |
398 // | | |
399 // Proj #5 ( oop result ) | |
400 // top | | |
401 // \ | | |
402 // AddP ( base == top ) | |
403 // | |
404 // case #4. Array's element reference: | |
405 // {CheckCastPP | CastPP} | |
406 // | | | | |
407 // | AddP ( array's element offset ) | |
408 // | | | |
409 // AddP ( array's offset ) | |
410 // | |
411 // case #5. Raw object's field reference for arraycopy stub call: | |
412 // The inline_native_clone() case when the arraycopy stub is called | |
413 // after the allocation before Initialize and CheckCastPP nodes. | |
414 // Allocate | |
415 // | | |
416 // Proj #5 ( oop result ) | |
417 // | | | |
418 // AddP ( base == address ) | |
419 // | |
77 | 420 // case #6. Constant Pool, ThreadLocal, CastX2P or |
421 // Raw object's field reference: | |
422 // {ConP, ThreadLocal, CastX2P, raw Load} | |
65 | 423 // top | |
424 // \ | | |
425 // AddP ( base == top ) | |
426 // | |
77 | 427 // case #7. Klass's field reference. |
428 // LoadKlass | |
429 // | | | |
430 // AddP ( base == address ) | |
431 // | |
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432 // case #8. narrow Klass's field reference. |
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433 // LoadNKlass |
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434 // | |
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435 // DecodeN |
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436 // | | |
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437 // AddP ( base == address ) |
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438 // |
65 | 439 Node *base = addp->in(AddPNode::Base)->uncast(); |
440 if (base->is_top()) { // The AddP case #3 and #6. | |
441 base = addp->in(AddPNode::Address)->uncast(); | |
442 assert(base->Opcode() == Op_ConP || base->Opcode() == Op_ThreadLocal || | |
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443 base->Opcode() == Op_CastX2P || base->is_DecodeN() || |
77 | 444 (base->is_Mem() && base->bottom_type() == TypeRawPtr::NOTNULL) || |
445 (base->is_Proj() && base->in(0)->is_Allocate()), "sanity"); | |
0 | 446 } |
65 | 447 return base; |
448 } | |
449 | |
450 static Node* find_second_addp(Node* addp, Node* n) { | |
451 assert(addp->is_AddP() && addp->outcnt() > 0, "Don't process dead nodes"); | |
452 | |
453 Node* addp2 = addp->raw_out(0); | |
454 if (addp->outcnt() == 1 && addp2->is_AddP() && | |
455 addp2->in(AddPNode::Base) == n && | |
456 addp2->in(AddPNode::Address) == addp) { | |
457 | |
458 assert(addp->in(AddPNode::Base) == n, "expecting the same base"); | |
459 // | |
460 // Find array's offset to push it on worklist first and | |
461 // as result process an array's element offset first (pushed second) | |
462 // to avoid CastPP for the array's offset. | |
463 // Otherwise the inserted CastPP (LocalVar) will point to what | |
464 // the AddP (Field) points to. Which would be wrong since | |
465 // the algorithm expects the CastPP has the same point as | |
466 // as AddP's base CheckCastPP (LocalVar). | |
467 // | |
468 // ArrayAllocation | |
469 // | | |
470 // CheckCastPP | |
471 // | | |
472 // memProj (from ArrayAllocation CheckCastPP) | |
473 // | || | |
474 // | || Int (element index) | |
475 // | || | ConI (log(element size)) | |
476 // | || | / | |
477 // | || LShift | |
478 // | || / | |
479 // | AddP (array's element offset) | |
480 // | | | |
481 // | | ConI (array's offset: #12(32-bits) or #24(64-bits)) | |
482 // | / / | |
483 // AddP (array's offset) | |
484 // | | |
485 // Load/Store (memory operation on array's element) | |
486 // | |
487 return addp2; | |
488 } | |
489 return NULL; | |
0 | 490 } |
491 | |
492 // | |
493 // Adjust the type and inputs of an AddP which computes the | |
494 // address of a field of an instance | |
495 // | |
293
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496 bool ConnectionGraph::split_AddP(Node *addp, Node *base, PhaseGVN *igvn) { |
65 | 497 const TypeOopPtr *base_t = igvn->type(base)->isa_oopptr(); |
223 | 498 assert(base_t != NULL && base_t->is_known_instance(), "expecting instance oopptr"); |
0 | 499 const TypeOopPtr *t = igvn->type(addp)->isa_oopptr(); |
65 | 500 if (t == NULL) { |
501 // We are computing a raw address for a store captured by an Initialize | |
293
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502 // compute an appropriate address type (cases #3 and #5). |
65 | 503 assert(igvn->type(addp) == TypeRawPtr::NOTNULL, "must be raw pointer"); |
504 assert(addp->in(AddPNode::Address)->is_Proj(), "base of raw address must be result projection from allocation"); | |
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505 intptr_t offs = (int)igvn->find_intptr_t_con(addp->in(AddPNode::Offset), Type::OffsetBot); |
65 | 506 assert(offs != Type::OffsetBot, "offset must be a constant"); |
507 t = base_t->add_offset(offs)->is_oopptr(); | |
508 } | |
223 | 509 int inst_id = base_t->instance_id(); |
510 assert(!t->is_known_instance() || t->instance_id() == inst_id, | |
0 | 511 "old type must be non-instance or match new type"); |
293
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512 |
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513 // The type 't' could be subclass of 'base_t'. |
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514 // As result t->offset() could be large then base_t's size and it will |
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515 // cause the failure in add_offset() with narrow oops since TypeOopPtr() |
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516 // constructor verifies correctness of the offset. |
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517 // |
605 | 518 // It could happened on subclass's branch (from the type profiling |
293
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519 // inlining) which was not eliminated during parsing since the exactness |
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520 // of the allocation type was not propagated to the subclass type check. |
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521 // |
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522 // Do nothing for such AddP node and don't process its users since |
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523 // this code branch will go away. |
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524 // |
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525 if (!t->is_known_instance() && |
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526 !t->klass()->equals(base_t->klass()) && |
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527 t->klass()->is_subtype_of(base_t->klass())) { |
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528 return false; // bail out |
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529 } |
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530 |
0 | 531 const TypeOopPtr *tinst = base_t->add_offset(t->offset())->is_oopptr(); |
65 | 532 // Do NOT remove the next call: ensure an new alias index is allocated |
533 // for the instance type | |
0 | 534 int alias_idx = _compile->get_alias_index(tinst); |
535 igvn->set_type(addp, tinst); | |
536 // record the allocation in the node map | |
537 set_map(addp->_idx, get_map(base->_idx)); | |
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538 |
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539 // Set addp's Base and Address to 'base'. |
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540 Node *abase = addp->in(AddPNode::Base); |
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541 Node *adr = addp->in(AddPNode::Address); |
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542 if (adr->is_Proj() && adr->in(0)->is_Allocate() && |
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543 adr->in(0)->_idx == (uint)inst_id) { |
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544 // Skip AddP cases #3 and #5. |
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545 } else { |
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546 assert(!abase->is_top(), "sanity"); // AddP case #3 |
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547 if (abase != base) { |
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548 igvn->hash_delete(addp); |
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549 addp->set_req(AddPNode::Base, base); |
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550 if (abase == adr) { |
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551 addp->set_req(AddPNode::Address, base); |
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552 } else { |
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553 // AddP case #4 (adr is array's element offset AddP node) |
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554 #ifdef ASSERT |
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555 const TypeOopPtr *atype = igvn->type(adr)->isa_oopptr(); |
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556 assert(adr->is_AddP() && atype != NULL && |
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557 atype->instance_id() == inst_id, "array's element offset should be processed first"); |
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558 #endif |
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559 } |
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560 igvn->hash_insert(addp); |
0 | 561 } |
562 } | |
65 | 563 // Put on IGVN worklist since at least addp's type was changed above. |
564 record_for_optimizer(addp); | |
293
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565 return true; |
0 | 566 } |
567 | |
568 // | |
569 // Create a new version of orig_phi if necessary. Returns either the newly | |
570 // created phi or an existing phi. Sets create_new to indicate wheter a new | |
571 // phi was created. Cache the last newly created phi in the node map. | |
572 // | |
573 PhiNode *ConnectionGraph::create_split_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn, bool &new_created) { | |
574 Compile *C = _compile; | |
575 new_created = false; | |
576 int phi_alias_idx = C->get_alias_index(orig_phi->adr_type()); | |
577 // nothing to do if orig_phi is bottom memory or matches alias_idx | |
65 | 578 if (phi_alias_idx == alias_idx) { |
0 | 579 return orig_phi; |
580 } | |
851
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581 // Have we recently created a Phi for this alias index? |
0 | 582 PhiNode *result = get_map_phi(orig_phi->_idx); |
583 if (result != NULL && C->get_alias_index(result->adr_type()) == alias_idx) { | |
584 return result; | |
585 } | |
851
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586 // Previous check may fail when the same wide memory Phi was split into Phis |
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587 // for different memory slices. Search all Phis for this region. |
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588 if (result != NULL) { |
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589 Node* region = orig_phi->in(0); |
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590 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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591 Node* phi = region->fast_out(i); |
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592 if (phi->is_Phi() && |
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593 C->get_alias_index(phi->as_Phi()->adr_type()) == alias_idx) { |
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594 assert(phi->_idx >= nodes_size(), "only new Phi per instance memory slice"); |
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595 return phi->as_Phi(); |
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596 } |
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597 } |
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598 } |
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599 if ((int)C->unique() + 2*NodeLimitFudgeFactor > MaxNodeLimit) { |
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600 if (C->do_escape_analysis() == true && !C->failing()) { |
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601 // Retry compilation without escape analysis. |
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602 // If this is the first failure, the sentinel string will "stick" |
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603 // to the Compile object, and the C2Compiler will see it and retry. |
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604 C->record_failure(C2Compiler::retry_no_escape_analysis()); |
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605 } |
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606 return NULL; |
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607 } |
0 | 608 orig_phi_worklist.append_if_missing(orig_phi); |
65 | 609 const TypePtr *atype = C->get_adr_type(alias_idx); |
0 | 610 result = PhiNode::make(orig_phi->in(0), NULL, Type::MEMORY, atype); |
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611 C->copy_node_notes_to(result, orig_phi); |
0 | 612 set_map_phi(orig_phi->_idx, result); |
613 igvn->set_type(result, result->bottom_type()); | |
614 record_for_optimizer(result); | |
615 new_created = true; | |
616 return result; | |
617 } | |
618 | |
619 // | |
620 // Return a new version of Memory Phi "orig_phi" with the inputs having the | |
621 // specified alias index. | |
622 // | |
623 PhiNode *ConnectionGraph::split_memory_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn) { | |
624 | |
625 assert(alias_idx != Compile::AliasIdxBot, "can't split out bottom memory"); | |
626 Compile *C = _compile; | |
627 bool new_phi_created; | |
65 | 628 PhiNode *result = create_split_phi(orig_phi, alias_idx, orig_phi_worklist, igvn, new_phi_created); |
0 | 629 if (!new_phi_created) { |
630 return result; | |
631 } | |
632 | |
633 GrowableArray<PhiNode *> phi_list; | |
634 GrowableArray<uint> cur_input; | |
635 | |
636 PhiNode *phi = orig_phi; | |
637 uint idx = 1; | |
638 bool finished = false; | |
639 while(!finished) { | |
640 while (idx < phi->req()) { | |
65 | 641 Node *mem = find_inst_mem(phi->in(idx), alias_idx, orig_phi_worklist, igvn); |
0 | 642 if (mem != NULL && mem->is_Phi()) { |
65 | 643 PhiNode *newphi = create_split_phi(mem->as_Phi(), alias_idx, orig_phi_worklist, igvn, new_phi_created); |
0 | 644 if (new_phi_created) { |
645 // found an phi for which we created a new split, push current one on worklist and begin | |
646 // processing new one | |
647 phi_list.push(phi); | |
648 cur_input.push(idx); | |
649 phi = mem->as_Phi(); | |
65 | 650 result = newphi; |
0 | 651 idx = 1; |
652 continue; | |
653 } else { | |
65 | 654 mem = newphi; |
0 | 655 } |
656 } | |
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657 if (C->failing()) { |
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658 return NULL; |
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659 } |
0 | 660 result->set_req(idx++, mem); |
661 } | |
662 #ifdef ASSERT | |
663 // verify that the new Phi has an input for each input of the original | |
664 assert( phi->req() == result->req(), "must have same number of inputs."); | |
665 assert( result->in(0) != NULL && result->in(0) == phi->in(0), "regions must match"); | |
65 | 666 #endif |
667 // Check if all new phi's inputs have specified alias index. | |
668 // Otherwise use old phi. | |
0 | 669 for (uint i = 1; i < phi->req(); i++) { |
65 | 670 Node* in = result->in(i); |
671 assert((phi->in(i) == NULL) == (in == NULL), "inputs must correspond."); | |
0 | 672 } |
673 // we have finished processing a Phi, see if there are any more to do | |
674 finished = (phi_list.length() == 0 ); | |
675 if (!finished) { | |
676 phi = phi_list.pop(); | |
677 idx = cur_input.pop(); | |
65 | 678 PhiNode *prev_result = get_map_phi(phi->_idx); |
679 prev_result->set_req(idx++, result); | |
680 result = prev_result; | |
0 | 681 } |
682 } | |
683 return result; | |
684 } | |
685 | |
65 | 686 |
687 // | |
688 // The next methods are derived from methods in MemNode. | |
689 // | |
690 static Node *step_through_mergemem(MergeMemNode *mmem, int alias_idx, const TypeOopPtr *tinst) { | |
691 Node *mem = mmem; | |
692 // TypeInstPtr::NOTNULL+any is an OOP with unknown offset - generally | |
693 // means an array I have not precisely typed yet. Do not do any | |
694 // alias stuff with it any time soon. | |
695 if( tinst->base() != Type::AnyPtr && | |
696 !(tinst->klass()->is_java_lang_Object() && | |
697 tinst->offset() == Type::OffsetBot) ) { | |
698 mem = mmem->memory_at(alias_idx); | |
699 // Update input if it is progress over what we have now | |
700 } | |
701 return mem; | |
702 } | |
703 | |
704 // | |
705 // Search memory chain of "mem" to find a MemNode whose address | |
706 // is the specified alias index. | |
707 // | |
708 Node* ConnectionGraph::find_inst_mem(Node *orig_mem, int alias_idx, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *phase) { | |
709 if (orig_mem == NULL) | |
710 return orig_mem; | |
711 Compile* C = phase->C; | |
712 const TypeOopPtr *tinst = C->get_adr_type(alias_idx)->isa_oopptr(); | |
223 | 713 bool is_instance = (tinst != NULL) && tinst->is_known_instance(); |
253
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714 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
65 | 715 Node *prev = NULL; |
716 Node *result = orig_mem; | |
717 while (prev != result) { | |
718 prev = result; | |
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719 if (result == start_mem) |
605 | 720 break; // hit one of our sentinels |
65 | 721 if (result->is_Mem()) { |
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722 const Type *at = phase->type(result->in(MemNode::Address)); |
65 | 723 if (at != Type::TOP) { |
724 assert (at->isa_ptr() != NULL, "pointer type required."); | |
725 int idx = C->get_alias_index(at->is_ptr()); | |
726 if (idx == alias_idx) | |
727 break; | |
728 } | |
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729 result = result->in(MemNode::Memory); |
65 | 730 } |
731 if (!is_instance) | |
732 continue; // don't search further for non-instance types | |
733 // skip over a call which does not affect this memory slice | |
734 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { | |
735 Node *proj_in = result->in(0); | |
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736 if (proj_in->is_Allocate() && proj_in->_idx == (uint)tinst->instance_id()) { |
605 | 737 break; // hit one of our sentinels |
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738 } else if (proj_in->is_Call()) { |
65 | 739 CallNode *call = proj_in->as_Call(); |
740 if (!call->may_modify(tinst, phase)) { | |
741 result = call->in(TypeFunc::Memory); | |
742 } | |
743 } else if (proj_in->is_Initialize()) { | |
744 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); | |
745 // Stop if this is the initialization for the object instance which | |
746 // which contains this memory slice, otherwise skip over it. | |
223 | 747 if (alloc == NULL || alloc->_idx != (uint)tinst->instance_id()) { |
65 | 748 result = proj_in->in(TypeFunc::Memory); |
749 } | |
750 } else if (proj_in->is_MemBar()) { | |
751 result = proj_in->in(TypeFunc::Memory); | |
752 } | |
753 } else if (result->is_MergeMem()) { | |
754 MergeMemNode *mmem = result->as_MergeMem(); | |
755 result = step_through_mergemem(mmem, alias_idx, tinst); | |
756 if (result == mmem->base_memory()) { | |
757 // Didn't find instance memory, search through general slice recursively. | |
758 result = mmem->memory_at(C->get_general_index(alias_idx)); | |
759 result = find_inst_mem(result, alias_idx, orig_phis, phase); | |
760 if (C->failing()) { | |
761 return NULL; | |
762 } | |
763 mmem->set_memory_at(alias_idx, result); | |
764 } | |
765 } else if (result->is_Phi() && | |
766 C->get_alias_index(result->as_Phi()->adr_type()) != alias_idx) { | |
767 Node *un = result->as_Phi()->unique_input(phase); | |
768 if (un != NULL) { | |
769 result = un; | |
770 } else { | |
771 break; | |
772 } | |
584 | 773 } else if (result->Opcode() == Op_SCMemProj) { |
774 assert(result->in(0)->is_LoadStore(), "sanity"); | |
775 const Type *at = phase->type(result->in(0)->in(MemNode::Address)); | |
776 if (at != Type::TOP) { | |
777 assert (at->isa_ptr() != NULL, "pointer type required."); | |
778 int idx = C->get_alias_index(at->is_ptr()); | |
779 assert(idx != alias_idx, "Object is not scalar replaceable if a LoadStore node access its field"); | |
780 break; | |
781 } | |
782 result = result->in(0)->in(MemNode::Memory); | |
65 | 783 } |
784 } | |
247 | 785 if (result->is_Phi()) { |
65 | 786 PhiNode *mphi = result->as_Phi(); |
787 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); | |
788 const TypePtr *t = mphi->adr_type(); | |
789 if (C->get_alias_index(t) != alias_idx) { | |
247 | 790 // Create a new Phi with the specified alias index type. |
65 | 791 result = split_memory_phi(mphi, alias_idx, orig_phis, phase); |
247 | 792 } else if (!is_instance) { |
793 // Push all non-instance Phis on the orig_phis worklist to update inputs | |
794 // during Phase 4 if needed. | |
795 orig_phis.append_if_missing(mphi); | |
65 | 796 } |
797 } | |
798 // the result is either MemNode, PhiNode, InitializeNode. | |
799 return result; | |
800 } | |
801 | |
802 | |
0 | 803 // |
804 // Convert the types of unescaped object to instance types where possible, | |
805 // propagate the new type information through the graph, and update memory | |
806 // edges and MergeMem inputs to reflect the new type. | |
807 // | |
808 // We start with allocations (and calls which may be allocations) on alloc_worklist. | |
809 // The processing is done in 4 phases: | |
810 // | |
811 // Phase 1: Process possible allocations from alloc_worklist. Create instance | |
812 // types for the CheckCastPP for allocations where possible. | |
813 // Propagate the the new types through users as follows: | |
814 // casts and Phi: push users on alloc_worklist | |
815 // AddP: cast Base and Address inputs to the instance type | |
816 // push any AddP users on alloc_worklist and push any memnode | |
817 // users onto memnode_worklist. | |
818 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and | |
819 // search the Memory chain for a store with the appropriate type | |
820 // address type. If a Phi is found, create a new version with | |
605 | 821 // the appropriate memory slices from each of the Phi inputs. |
0 | 822 // For stores, process the users as follows: |
823 // MemNode: push on memnode_worklist | |
824 // MergeMem: push on mergemem_worklist | |
825 // Phase 3: Process MergeMem nodes from mergemem_worklist. Walk each memory slice | |
826 // moving the first node encountered of each instance type to the | |
827 // the input corresponding to its alias index. | |
828 // appropriate memory slice. | |
829 // Phase 4: Update the inputs of non-instance memory Phis and the Memory input of memnodes. | |
830 // | |
831 // In the following example, the CheckCastPP nodes are the cast of allocation | |
832 // results and the allocation of node 29 is unescaped and eligible to be an | |
833 // instance type. | |
834 // | |
835 // We start with: | |
836 // | |
837 // 7 Parm #memory | |
838 // 10 ConI "12" | |
839 // 19 CheckCastPP "Foo" | |
840 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
841 // 29 CheckCastPP "Foo" | |
842 // 30 AddP _ 29 29 10 Foo+12 alias_index=4 | |
843 // | |
844 // 40 StoreP 25 7 20 ... alias_index=4 | |
845 // 50 StoreP 35 40 30 ... alias_index=4 | |
846 // 60 StoreP 45 50 20 ... alias_index=4 | |
847 // 70 LoadP _ 60 30 ... alias_index=4 | |
848 // 80 Phi 75 50 60 Memory alias_index=4 | |
849 // 90 LoadP _ 80 30 ... alias_index=4 | |
850 // 100 LoadP _ 80 20 ... alias_index=4 | |
851 // | |
852 // | |
853 // Phase 1 creates an instance type for node 29 assigning it an instance id of 24 | |
854 // and creating a new alias index for node 30. This gives: | |
855 // | |
856 // 7 Parm #memory | |
857 // 10 ConI "12" | |
858 // 19 CheckCastPP "Foo" | |
859 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
860 // 29 CheckCastPP "Foo" iid=24 | |
861 // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24 | |
862 // | |
863 // 40 StoreP 25 7 20 ... alias_index=4 | |
864 // 50 StoreP 35 40 30 ... alias_index=6 | |
865 // 60 StoreP 45 50 20 ... alias_index=4 | |
866 // 70 LoadP _ 60 30 ... alias_index=6 | |
867 // 80 Phi 75 50 60 Memory alias_index=4 | |
868 // 90 LoadP _ 80 30 ... alias_index=6 | |
869 // 100 LoadP _ 80 20 ... alias_index=4 | |
870 // | |
871 // In phase 2, new memory inputs are computed for the loads and stores, | |
872 // And a new version of the phi is created. In phase 4, the inputs to | |
873 // node 80 are updated and then the memory nodes are updated with the | |
874 // values computed in phase 2. This results in: | |
875 // | |
876 // 7 Parm #memory | |
877 // 10 ConI "12" | |
878 // 19 CheckCastPP "Foo" | |
879 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
880 // 29 CheckCastPP "Foo" iid=24 | |
881 // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24 | |
882 // | |
883 // 40 StoreP 25 7 20 ... alias_index=4 | |
884 // 50 StoreP 35 7 30 ... alias_index=6 | |
885 // 60 StoreP 45 40 20 ... alias_index=4 | |
886 // 70 LoadP _ 50 30 ... alias_index=6 | |
887 // 80 Phi 75 40 60 Memory alias_index=4 | |
888 // 120 Phi 75 50 50 Memory alias_index=6 | |
889 // 90 LoadP _ 120 30 ... alias_index=6 | |
890 // 100 LoadP _ 80 20 ... alias_index=4 | |
891 // | |
892 void ConnectionGraph::split_unique_types(GrowableArray<Node *> &alloc_worklist) { | |
893 GrowableArray<Node *> memnode_worklist; | |
894 GrowableArray<Node *> mergemem_worklist; | |
895 GrowableArray<PhiNode *> orig_phis; | |
896 PhaseGVN *igvn = _compile->initial_gvn(); | |
897 uint new_index_start = (uint) _compile->num_alias_types(); | |
898 VectorSet visited(Thread::current()->resource_area()); | |
899 VectorSet ptset(Thread::current()->resource_area()); | |
900 | |
65 | 901 |
902 // Phase 1: Process possible allocations from alloc_worklist. | |
903 // Create instance types for the CheckCastPP for allocations where possible. | |
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904 // |
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905 // (Note: don't forget to change the order of the second AddP node on |
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906 // the alloc_worklist if the order of the worklist processing is changed, |
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907 // see the comment in find_second_addp().) |
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908 // |
0 | 909 while (alloc_worklist.length() != 0) { |
910 Node *n = alloc_worklist.pop(); | |
911 uint ni = n->_idx; | |
65 | 912 const TypeOopPtr* tinst = NULL; |
0 | 913 if (n->is_Call()) { |
914 CallNode *alloc = n->as_Call(); | |
915 // copy escape information to call node | |
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916 PointsToNode* ptn = ptnode_adr(alloc->_idx); |
0 | 917 PointsToNode::EscapeState es = escape_state(alloc, igvn); |
65 | 918 // We have an allocation or call which returns a Java object, |
919 // see if it is unescaped. | |
920 if (es != PointsToNode::NoEscape || !ptn->_scalar_replaceable) | |
0 | 921 continue; |
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922 |
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923 // Find CheckCastPP for the allocate or for the return value of a call |
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924 n = alloc->result_cast(); |
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925 if (n == NULL) { // No uses except Initialize node |
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926 if (alloc->is_Allocate()) { |
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927 // Set the scalar_replaceable flag for allocation |
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928 // so it could be eliminated if it has no uses. |
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929 alloc->as_Allocate()->_is_scalar_replaceable = true; |
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930 } |
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931 continue; |
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932 } |
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933 if (!n->is_CheckCastPP()) { // not unique CheckCastPP. |
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934 assert(!alloc->is_Allocate(), "allocation should have unique type"); |
65 | 935 continue; |
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936 } |
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937 |
65 | 938 // The inline code for Object.clone() casts the allocation result to |
247 | 939 // java.lang.Object and then to the actual type of the allocated |
65 | 940 // object. Detect this case and use the second cast. |
247 | 941 // Also detect j.l.reflect.Array.newInstance(jobject, jint) case when |
942 // the allocation result is cast to java.lang.Object and then | |
943 // to the actual Array type. | |
65 | 944 if (alloc->is_Allocate() && n->as_Type()->type() == TypeInstPtr::NOTNULL |
247 | 945 && (alloc->is_AllocateArray() || |
946 igvn->type(alloc->in(AllocateNode::KlassNode)) != TypeKlassPtr::OBJECT)) { | |
65 | 947 Node *cast2 = NULL; |
948 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
949 Node *use = n->fast_out(i); | |
950 if (use->is_CheckCastPP()) { | |
951 cast2 = use; | |
952 break; | |
953 } | |
954 } | |
955 if (cast2 != NULL) { | |
956 n = cast2; | |
957 } else { | |
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958 // Non-scalar replaceable if the allocation type is unknown statically |
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959 // (reflection allocation), the object can't be restored during |
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960 // deoptimization without precise type. |
65 | 961 continue; |
962 } | |
963 } | |
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964 if (alloc->is_Allocate()) { |
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965 // Set the scalar_replaceable flag for allocation |
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966 // so it could be eliminated. |
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967 alloc->as_Allocate()->_is_scalar_replaceable = true; |
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968 } |
65 | 969 set_escape_state(n->_idx, es); |
247 | 970 // in order for an object to be scalar-replaceable, it must be: |
65 | 971 // - a direct allocation (not a call returning an object) |
972 // - non-escaping | |
973 // - eligible to be a unique type | |
974 // - not determined to be ineligible by escape analysis | |
0 | 975 set_map(alloc->_idx, n); |
976 set_map(n->_idx, alloc); | |
65 | 977 const TypeOopPtr *t = igvn->type(n)->isa_oopptr(); |
978 if (t == NULL) | |
0 | 979 continue; // not a TypeInstPtr |
247 | 980 tinst = t->cast_to_exactness(true)->is_oopptr()->cast_to_instance_id(ni); |
0 | 981 igvn->hash_delete(n); |
982 igvn->set_type(n, tinst); | |
983 n->raise_bottom_type(tinst); | |
984 igvn->hash_insert(n); | |
65 | 985 record_for_optimizer(n); |
986 if (alloc->is_Allocate() && ptn->_scalar_replaceable && | |
987 (t->isa_instptr() || t->isa_aryptr())) { | |
163 | 988 |
989 // First, put on the worklist all Field edges from Connection Graph | |
990 // which is more accurate then putting immediate users from Ideal Graph. | |
991 for (uint e = 0; e < ptn->edge_count(); e++) { | |
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992 Node *use = ptnode_adr(ptn->edge_target(e))->_node; |
163 | 993 assert(ptn->edge_type(e) == PointsToNode::FieldEdge && use->is_AddP(), |
994 "only AddP nodes are Field edges in CG"); | |
995 if (use->outcnt() > 0) { // Don't process dead nodes | |
996 Node* addp2 = find_second_addp(use, use->in(AddPNode::Base)); | |
997 if (addp2 != NULL) { | |
998 assert(alloc->is_AllocateArray(),"array allocation was expected"); | |
999 alloc_worklist.append_if_missing(addp2); | |
1000 } | |
1001 alloc_worklist.append_if_missing(use); | |
1002 } | |
1003 } | |
1004 | |
65 | 1005 // An allocation may have an Initialize which has raw stores. Scan |
1006 // the users of the raw allocation result and push AddP users | |
1007 // on alloc_worklist. | |
1008 Node *raw_result = alloc->proj_out(TypeFunc::Parms); | |
1009 assert (raw_result != NULL, "must have an allocation result"); | |
1010 for (DUIterator_Fast imax, i = raw_result->fast_outs(imax); i < imax; i++) { | |
1011 Node *use = raw_result->fast_out(i); | |
1012 if (use->is_AddP() && use->outcnt() > 0) { // Don't process dead nodes | |
1013 Node* addp2 = find_second_addp(use, raw_result); | |
1014 if (addp2 != NULL) { | |
1015 assert(alloc->is_AllocateArray(),"array allocation was expected"); | |
1016 alloc_worklist.append_if_missing(addp2); | |
1017 } | |
1018 alloc_worklist.append_if_missing(use); | |
1019 } else if (use->is_Initialize()) { | |
1020 memnode_worklist.append_if_missing(use); | |
1021 } | |
1022 } | |
1023 } | |
0 | 1024 } else if (n->is_AddP()) { |
1025 ptset.Clear(); | |
65 | 1026 PointsTo(ptset, get_addp_base(n), igvn); |
0 | 1027 assert(ptset.Size() == 1, "AddP address is unique"); |
65 | 1028 uint elem = ptset.getelem(); // Allocation node's index |
1029 if (elem == _phantom_object) | |
1030 continue; // Assume the value was set outside this method. | |
1031 Node *base = get_map(elem); // CheckCastPP node | |
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1032 if (!split_AddP(n, base, igvn)) continue; // wrong type |
65 | 1033 tinst = igvn->type(base)->isa_oopptr(); |
1034 } else if (n->is_Phi() || | |
1035 n->is_CheckCastPP() || | |
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1036 n->is_EncodeP() || |
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1037 n->is_DecodeN() || |
65 | 1038 (n->is_ConstraintCast() && n->Opcode() == Op_CastPP)) { |
0 | 1039 if (visited.test_set(n->_idx)) { |
1040 assert(n->is_Phi(), "loops only through Phi's"); | |
1041 continue; // already processed | |
1042 } | |
1043 ptset.Clear(); | |
1044 PointsTo(ptset, n, igvn); | |
1045 if (ptset.Size() == 1) { | |
65 | 1046 uint elem = ptset.getelem(); // Allocation node's index |
1047 if (elem == _phantom_object) | |
1048 continue; // Assume the value was set outside this method. | |
1049 Node *val = get_map(elem); // CheckCastPP node | |
0 | 1050 TypeNode *tn = n->as_Type(); |
65 | 1051 tinst = igvn->type(val)->isa_oopptr(); |
223 | 1052 assert(tinst != NULL && tinst->is_known_instance() && |
1053 (uint)tinst->instance_id() == elem , "instance type expected."); | |
163 | 1054 |
1055 const Type *tn_type = igvn->type(tn); | |
223 | 1056 const TypeOopPtr *tn_t; |
1057 if (tn_type->isa_narrowoop()) { | |
1058 tn_t = tn_type->make_ptr()->isa_oopptr(); | |
1059 } else { | |
1060 tn_t = tn_type->isa_oopptr(); | |
1061 } | |
0 | 1062 |
65 | 1063 if (tn_t != NULL && |
223 | 1064 tinst->cast_to_instance_id(TypeOopPtr::InstanceBot)->higher_equal(tn_t)) { |
163 | 1065 if (tn_type->isa_narrowoop()) { |
1066 tn_type = tinst->make_narrowoop(); | |
1067 } else { | |
1068 tn_type = tinst; | |
1069 } | |
0 | 1070 igvn->hash_delete(tn); |
163 | 1071 igvn->set_type(tn, tn_type); |
1072 tn->set_type(tn_type); | |
0 | 1073 igvn->hash_insert(tn); |
65 | 1074 record_for_optimizer(n); |
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1075 } else { |
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1076 continue; // wrong type |
0 | 1077 } |
1078 } | |
1079 } else { | |
1080 continue; | |
1081 } | |
1082 // push users on appropriate worklist | |
1083 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1084 Node *use = n->fast_out(i); | |
1085 if(use->is_Mem() && use->in(MemNode::Address) == n) { | |
65 | 1086 memnode_worklist.append_if_missing(use); |
1087 } else if (use->is_Initialize()) { | |
1088 memnode_worklist.append_if_missing(use); | |
1089 } else if (use->is_MergeMem()) { | |
1090 mergemem_worklist.append_if_missing(use); | |
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1091 } else if (use->is_SafePoint() && tinst != NULL) { |
65 | 1092 // Look for MergeMem nodes for calls which reference unique allocation |
1093 // (through CheckCastPP nodes) even for debug info. | |
1094 Node* m = use->in(TypeFunc::Memory); | |
1095 uint iid = tinst->instance_id(); | |
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1096 while (m->is_Proj() && m->in(0)->is_SafePoint() && |
65 | 1097 m->in(0) != use && !m->in(0)->_idx != iid) { |
1098 m = m->in(0)->in(TypeFunc::Memory); | |
1099 } | |
1100 if (m->is_MergeMem()) { | |
1101 mergemem_worklist.append_if_missing(m); | |
1102 } | |
1103 } else if (use->is_AddP() && use->outcnt() > 0) { // No dead nodes | |
1104 Node* addp2 = find_second_addp(use, n); | |
1105 if (addp2 != NULL) { | |
1106 alloc_worklist.append_if_missing(addp2); | |
1107 } | |
1108 alloc_worklist.append_if_missing(use); | |
1109 } else if (use->is_Phi() || | |
1110 use->is_CheckCastPP() || | |
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1111 use->is_EncodeP() || |
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1112 use->is_DecodeN() || |
65 | 1113 (use->is_ConstraintCast() && use->Opcode() == Op_CastPP)) { |
1114 alloc_worklist.append_if_missing(use); | |
0 | 1115 } |
1116 } | |
1117 | |
1118 } | |
65 | 1119 // New alias types were created in split_AddP(). |
0 | 1120 uint new_index_end = (uint) _compile->num_alias_types(); |
1121 | |
1122 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and | |
1123 // compute new values for Memory inputs (the Memory inputs are not | |
1124 // actually updated until phase 4.) | |
1125 if (memnode_worklist.length() == 0) | |
1126 return; // nothing to do | |
1127 | |
1128 while (memnode_worklist.length() != 0) { | |
1129 Node *n = memnode_worklist.pop(); | |
65 | 1130 if (visited.test_set(n->_idx)) |
1131 continue; | |
0 | 1132 if (n->is_Phi()) { |
1133 assert(n->as_Phi()->adr_type() != TypePtr::BOTTOM, "narrow memory slice required"); | |
1134 // we don't need to do anything, but the users must be pushed if we haven't processed | |
1135 // this Phi before | |
65 | 1136 } else if (n->is_Initialize()) { |
1137 // we don't need to do anything, but the users of the memory projection must be pushed | |
1138 n = n->as_Initialize()->proj_out(TypeFunc::Memory); | |
1139 if (n == NULL) | |
0 | 1140 continue; |
1141 } else { | |
1142 assert(n->is_Mem(), "memory node required."); | |
1143 Node *addr = n->in(MemNode::Address); | |
65 | 1144 assert(addr->is_AddP(), "AddP required"); |
0 | 1145 const Type *addr_t = igvn->type(addr); |
1146 if (addr_t == Type::TOP) | |
1147 continue; | |
1148 assert (addr_t->isa_ptr() != NULL, "pointer type required."); | |
1149 int alias_idx = _compile->get_alias_index(addr_t->is_ptr()); | |
65 | 1150 assert ((uint)alias_idx < new_index_end, "wrong alias index"); |
1151 Node *mem = find_inst_mem(n->in(MemNode::Memory), alias_idx, orig_phis, igvn); | |
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1152 if (_compile->failing()) { |
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1153 return; |
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1154 } |
65 | 1155 if (mem != n->in(MemNode::Memory)) { |
0 | 1156 set_map(n->_idx, mem); |
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1157 ptnode_adr(n->_idx)->_node = n; |
65 | 1158 } |
0 | 1159 if (n->is_Load()) { |
1160 continue; // don't push users | |
1161 } else if (n->is_LoadStore()) { | |
1162 // get the memory projection | |
1163 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1164 Node *use = n->fast_out(i); | |
1165 if (use->Opcode() == Op_SCMemProj) { | |
1166 n = use; | |
1167 break; | |
1168 } | |
1169 } | |
1170 assert(n->Opcode() == Op_SCMemProj, "memory projection required"); | |
1171 } | |
1172 } | |
1173 // push user on appropriate worklist | |
1174 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1175 Node *use = n->fast_out(i); | |
1176 if (use->is_Phi()) { | |
65 | 1177 memnode_worklist.append_if_missing(use); |
0 | 1178 } else if(use->is_Mem() && use->in(MemNode::Memory) == n) { |
65 | 1179 memnode_worklist.append_if_missing(use); |
1180 } else if (use->is_Initialize()) { | |
1181 memnode_worklist.append_if_missing(use); | |
0 | 1182 } else if (use->is_MergeMem()) { |
65 | 1183 mergemem_worklist.append_if_missing(use); |
0 | 1184 } |
1185 } | |
1186 } | |
1187 | |
65 | 1188 // Phase 3: Process MergeMem nodes from mergemem_worklist. |
1189 // Walk each memory moving the first node encountered of each | |
1190 // instance type to the the input corresponding to its alias index. | |
0 | 1191 while (mergemem_worklist.length() != 0) { |
1192 Node *n = mergemem_worklist.pop(); | |
1193 assert(n->is_MergeMem(), "MergeMem node required."); | |
65 | 1194 if (visited.test_set(n->_idx)) |
1195 continue; | |
0 | 1196 MergeMemNode *nmm = n->as_MergeMem(); |
1197 // Note: we don't want to use MergeMemStream here because we only want to | |
65 | 1198 // scan inputs which exist at the start, not ones we add during processing. |
0 | 1199 uint nslices = nmm->req(); |
1200 igvn->hash_delete(nmm); | |
1201 for (uint i = Compile::AliasIdxRaw+1; i < nslices; i++) { | |
65 | 1202 Node* mem = nmm->in(i); |
1203 Node* cur = NULL; | |
0 | 1204 if (mem == NULL || mem->is_top()) |
1205 continue; | |
1206 while (mem->is_Mem()) { | |
1207 const Type *at = igvn->type(mem->in(MemNode::Address)); | |
1208 if (at != Type::TOP) { | |
1209 assert (at->isa_ptr() != NULL, "pointer type required."); | |
1210 uint idx = (uint)_compile->get_alias_index(at->is_ptr()); | |
1211 if (idx == i) { | |
1212 if (cur == NULL) | |
1213 cur = mem; | |
1214 } else { | |
1215 if (idx >= nmm->req() || nmm->is_empty_memory(nmm->in(idx))) { | |
1216 nmm->set_memory_at(idx, mem); | |
1217 } | |
1218 } | |
1219 } | |
1220 mem = mem->in(MemNode::Memory); | |
1221 } | |
1222 nmm->set_memory_at(i, (cur != NULL) ? cur : mem); | |
65 | 1223 // Find any instance of the current type if we haven't encountered |
1224 // a value of the instance along the chain. | |
1225 for (uint ni = new_index_start; ni < new_index_end; ni++) { | |
1226 if((uint)_compile->get_general_index(ni) == i) { | |
1227 Node *m = (ni >= nmm->req()) ? nmm->empty_memory() : nmm->in(ni); | |
1228 if (nmm->is_empty_memory(m)) { | |
1229 Node* result = find_inst_mem(mem, ni, orig_phis, igvn); | |
1230 if (_compile->failing()) { | |
1231 return; | |
1232 } | |
1233 nmm->set_memory_at(ni, result); | |
1234 } | |
1235 } | |
1236 } | |
1237 } | |
1238 // Find the rest of instances values | |
1239 for (uint ni = new_index_start; ni < new_index_end; ni++) { | |
1240 const TypeOopPtr *tinst = igvn->C->get_adr_type(ni)->isa_oopptr(); | |
1241 Node* result = step_through_mergemem(nmm, ni, tinst); | |
1242 if (result == nmm->base_memory()) { | |
1243 // Didn't find instance memory, search through general slice recursively. | |
1244 result = nmm->memory_at(igvn->C->get_general_index(ni)); | |
1245 result = find_inst_mem(result, ni, orig_phis, igvn); | |
1246 if (_compile->failing()) { | |
1247 return; | |
1248 } | |
1249 nmm->set_memory_at(ni, result); | |
1250 } | |
1251 } | |
1252 igvn->hash_insert(nmm); | |
1253 record_for_optimizer(nmm); | |
1254 | |
1255 // Propagate new memory slices to following MergeMem nodes. | |
1256 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1257 Node *use = n->fast_out(i); | |
1258 if (use->is_Call()) { | |
1259 CallNode* in = use->as_Call(); | |
1260 if (in->proj_out(TypeFunc::Memory) != NULL) { | |
1261 Node* m = in->proj_out(TypeFunc::Memory); | |
1262 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { | |
1263 Node* mm = m->fast_out(j); | |
1264 if (mm->is_MergeMem()) { | |
1265 mergemem_worklist.append_if_missing(mm); | |
1266 } | |
1267 } | |
1268 } | |
1269 if (use->is_Allocate()) { | |
1270 use = use->as_Allocate()->initialization(); | |
1271 if (use == NULL) { | |
1272 continue; | |
1273 } | |
1274 } | |
1275 } | |
1276 if (use->is_Initialize()) { | |
1277 InitializeNode* in = use->as_Initialize(); | |
1278 if (in->proj_out(TypeFunc::Memory) != NULL) { | |
1279 Node* m = in->proj_out(TypeFunc::Memory); | |
1280 for (DUIterator_Fast jmax, j = m->fast_outs(jmax); j < jmax; j++) { | |
1281 Node* mm = m->fast_out(j); | |
1282 if (mm->is_MergeMem()) { | |
1283 mergemem_worklist.append_if_missing(mm); | |
0 | 1284 } |
1285 } | |
1286 } | |
1287 } | |
1288 } | |
1289 } | |
1290 | |
65 | 1291 // Phase 4: Update the inputs of non-instance memory Phis and |
1292 // the Memory input of memnodes | |
0 | 1293 // First update the inputs of any non-instance Phi's from |
1294 // which we split out an instance Phi. Note we don't have | |
1295 // to recursively process Phi's encounted on the input memory | |
1296 // chains as is done in split_memory_phi() since they will | |
1297 // also be processed here. | |
247 | 1298 for (int j = 0; j < orig_phis.length(); j++) { |
1299 PhiNode *phi = orig_phis.at(j); | |
0 | 1300 int alias_idx = _compile->get_alias_index(phi->adr_type()); |
1301 igvn->hash_delete(phi); | |
1302 for (uint i = 1; i < phi->req(); i++) { | |
1303 Node *mem = phi->in(i); | |
65 | 1304 Node *new_mem = find_inst_mem(mem, alias_idx, orig_phis, igvn); |
1305 if (_compile->failing()) { | |
1306 return; | |
1307 } | |
0 | 1308 if (mem != new_mem) { |
1309 phi->set_req(i, new_mem); | |
1310 } | |
1311 } | |
1312 igvn->hash_insert(phi); | |
1313 record_for_optimizer(phi); | |
1314 } | |
1315 | |
1316 // Update the memory inputs of MemNodes with the value we computed | |
1317 // in Phase 2. | |
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1318 for (uint i = 0; i < nodes_size(); i++) { |
0 | 1319 Node *nmem = get_map(i); |
1320 if (nmem != NULL) { | |
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1321 Node *n = ptnode_adr(i)->_node; |
0 | 1322 if (n != NULL && n->is_Mem()) { |
1323 igvn->hash_delete(n); | |
1324 n->set_req(MemNode::Memory, nmem); | |
1325 igvn->hash_insert(n); | |
1326 record_for_optimizer(n); | |
1327 } | |
1328 } | |
1329 } | |
1330 } | |
1331 | |
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1332 bool ConnectionGraph::has_candidates(Compile *C) { |
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1333 // EA brings benefits only when the code has allocations and/or locks which |
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1334 // are represented by ideal Macro nodes. |
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1335 int cnt = C->macro_count(); |
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1336 for( int i=0; i < cnt; i++ ) { |
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1337 Node *n = C->macro_node(i); |
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1338 if ( n->is_Allocate() ) |
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1339 return true; |
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1340 if( n->is_Lock() ) { |
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1341 Node* obj = n->as_Lock()->obj_node()->uncast(); |
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1342 if( !(obj->is_Parm() || obj->is_Con()) ) |
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1343 return true; |
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1344 } |
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1345 } |
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1346 return false; |
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1347 } |
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1348 |
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1349 bool ConnectionGraph::compute_escape() { |
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1350 Compile* C = _compile; |
65 | 1351 |
163 | 1352 // 1. Populate Connection Graph (CG) with Ideal nodes. |
65 | 1353 |
1354 Unique_Node_List worklist_init; | |
244
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1355 worklist_init.map(C->unique(), NULL); // preallocate space |
65 | 1356 |
1357 // Initialize worklist | |
244
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1358 if (C->root() != NULL) { |
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1359 worklist_init.push(C->root()); |
65 | 1360 } |
1361 | |
1362 GrowableArray<int> cg_worklist; | |
244
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1363 PhaseGVN* igvn = C->initial_gvn(); |
65 | 1364 bool has_allocations = false; |
1365 | |
1366 // Push all useful nodes onto CG list and set their type. | |
1367 for( uint next = 0; next < worklist_init.size(); ++next ) { | |
1368 Node* n = worklist_init.at(next); | |
1369 record_for_escape_analysis(n, igvn); | |
244
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1370 // Only allocations and java static calls results are checked |
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1371 // for an escape status. See process_call_result() below. |
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1372 if (n->is_Allocate() || n->is_CallStaticJava() && |
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1373 ptnode_adr(n->_idx)->node_type() == PointsToNode::JavaObject) { |
65 | 1374 has_allocations = true; |
1375 } | |
1376 if(n->is_AddP()) | |
1377 cg_worklist.append(n->_idx); | |
1378 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1379 Node* m = n->fast_out(i); // Get user | |
1380 worklist_init.push(m); | |
1381 } | |
1382 } | |
0 | 1383 |
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1384 if (!has_allocations) { |
65 | 1385 _collecting = false; |
244
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1386 return false; // Nothing to do. |
65 | 1387 } |
1388 | |
1389 // 2. First pass to create simple CG edges (doesn't require to walk CG). | |
244
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1390 uint delayed_size = _delayed_worklist.size(); |
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1391 for( uint next = 0; next < delayed_size; ++next ) { |
65 | 1392 Node* n = _delayed_worklist.at(next); |
1393 build_connection_graph(n, igvn); | |
1394 } | |
0 | 1395 |
65 | 1396 // 3. Pass to create fields edges (Allocate -F-> AddP). |
244
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1397 uint cg_length = cg_worklist.length(); |
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1398 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1399 int ni = cg_worklist.at(next); |
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1400 build_connection_graph(ptnode_adr(ni)->_node, igvn); |
65 | 1401 } |
1402 | |
1403 cg_worklist.clear(); | |
1404 cg_worklist.append(_phantom_object); | |
1405 | |
1406 // 4. Build Connection Graph which need | |
1407 // to walk the connection graph. | |
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1408 for (uint ni = 0; ni < nodes_size(); ni++) { |
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1409 PointsToNode* ptn = ptnode_adr(ni); |
65 | 1410 Node *n = ptn->_node; |
1411 if (n != NULL) { // Call, AddP, LoadP, StoreP | |
1412 build_connection_graph(n, igvn); | |
1413 if (ptn->node_type() != PointsToNode::UnknownType) | |
1414 cg_worklist.append(n->_idx); // Collect CG nodes | |
1415 } | |
0 | 1416 } |
1417 | |
1418 VectorSet ptset(Thread::current()->resource_area()); | |
101
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1419 GrowableArray<uint> deferred_edges; |
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1420 VectorSet visited(Thread::current()->resource_area()); |
0 | 1421 |
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1422 // 5. Remove deferred edges from the graph and collect |
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1423 // information needed for type splitting. |
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1424 cg_length = cg_worklist.length(); |
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1425 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1426 int ni = cg_worklist.at(next); |
244
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1427 PointsToNode* ptn = ptnode_adr(ni); |
0 | 1428 PointsToNode::NodeType nt = ptn->node_type(); |
1429 if (nt == PointsToNode::LocalVar || nt == PointsToNode::Field) { | |
101
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1430 remove_deferred(ni, &deferred_edges, &visited); |
244
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1431 Node *n = ptn->_node; |
0 | 1432 if (n->is_AddP()) { |
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1433 // Search for objects which are not scalar replaceable. |
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1434 // Mark their escape state as ArgEscape to propagate the state |
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1435 // to referenced objects. |
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1436 // Note: currently there are no difference in compiler optimizations |
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1437 // for ArgEscape objects and NoEscape objects which are not |
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1438 // scalar replaceable. |
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1439 |
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1440 int offset = ptn->offset(); |
65 | 1441 Node *base = get_addp_base(n); |
0 | 1442 ptset.Clear(); |
1443 PointsTo(ptset, base, igvn); | |
253
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1444 int ptset_size = ptset.Size(); |
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1445 |
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1446 // Check if a field's initializing value is recorded and add |
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1447 // a corresponding NULL field's value if it is not recorded. |
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1448 // Connection Graph does not record a default initialization by NULL |
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1449 // captured by Initialize node. |
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1450 // |
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1451 // Note: it will disable scalar replacement in some cases: |
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1452 // |
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1453 // Point p[] = new Point[1]; |
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1454 // p[0] = new Point(); // Will be not scalar replaced |
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1455 // |
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1456 // but it will save us from incorrect optimizations in next cases: |
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1457 // |
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1458 // Point p[] = new Point[1]; |
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1459 // if ( x ) p[0] = new Point(); // Will be not scalar replaced |
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1460 // |
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1461 // Without a control flow analysis we can't distinguish above cases. |
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1462 // |
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1463 if (offset != Type::OffsetBot && ptset_size == 1) { |
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1464 uint elem = ptset.getelem(); // Allocation node's index |
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1465 // It does not matter if it is not Allocation node since |
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1466 // only non-escaping allocations are scalar replaced. |
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1467 if (ptnode_adr(elem)->_node->is_Allocate() && |
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1468 ptnode_adr(elem)->escape_state() == PointsToNode::NoEscape) { |
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1469 AllocateNode* alloc = ptnode_adr(elem)->_node->as_Allocate(); |
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1470 InitializeNode* ini = alloc->initialization(); |
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1471 Node* value = NULL; |
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1472 if (ini != NULL) { |
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1473 BasicType ft = UseCompressedOops ? T_NARROWOOP : T_OBJECT; |
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1474 Node* store = ini->find_captured_store(offset, type2aelembytes(ft), igvn); |
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1475 if (store != NULL && store->is_Store()) |
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1476 value = store->in(MemNode::ValueIn); |
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1477 } |
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1478 if (value == NULL || value != ptnode_adr(value->_idx)->_node) { |
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1479 // A field's initializing value was not recorded. Add NULL. |
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1480 uint null_idx = UseCompressedOops ? _noop_null : _oop_null; |
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1481 add_pointsto_edge(ni, null_idx); |
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1482 } |
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1483 } |
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1484 } |
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1485 |
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1486 // An object is not scalar replaceable if the field which may point |
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1487 // to it has unknown offset (unknown element of an array of objects). |
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1488 // |
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1489 if (offset == Type::OffsetBot) { |
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1490 uint e_cnt = ptn->edge_count(); |
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1491 for (uint ei = 0; ei < e_cnt; ei++) { |
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1492 uint npi = ptn->edge_target(ei); |
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1493 set_escape_state(npi, PointsToNode::ArgEscape); |
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1494 ptnode_adr(npi)->_scalar_replaceable = false; |
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1495 } |
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1496 } |
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1497 |
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1498 // Currently an object is not scalar replaceable if a LoadStore node |
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1499 // access its field since the field value is unknown after it. |
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1500 // |
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1501 bool has_LoadStore = false; |
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1502 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
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1503 Node *use = n->fast_out(i); |
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1504 if (use->is_LoadStore()) { |
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1505 has_LoadStore = true; |
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1506 break; |
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1507 } |
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1508 } |
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1509 // An object is not scalar replaceable if the address points |
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1510 // to unknown field (unknown element for arrays, offset is OffsetBot). |
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1511 // |
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1512 // Or the address may point to more then one object. This may produce |
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1513 // the false positive result (set scalar_replaceable to false) |
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1514 // since the flow-insensitive escape analysis can't separate |
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1515 // the case when stores overwrite the field's value from the case |
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1516 // when stores happened on different control branches. |
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1517 // |
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1518 if (ptset_size > 1 || ptset_size != 0 && |
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1519 (has_LoadStore || offset == Type::OffsetBot)) { |
0 | 1520 for( VectorSetI j(&ptset); j.test(); ++j ) { |
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1521 set_escape_state(j.elem, PointsToNode::ArgEscape); |
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1522 ptnode_adr(j.elem)->_scalar_replaceable = false; |
0 | 1523 } |
1524 } | |
1525 } | |
1526 } | |
1527 } | |
65 | 1528 |
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1529 // 6. Propagate escape states. |
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1530 GrowableArray<int> worklist; |
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1531 bool has_non_escaping_obj = false; |
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1532 |
0 | 1533 // push all GlobalEscape nodes on the worklist |
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1534 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1535 int nk = cg_worklist.at(next); |
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1536 if (ptnode_adr(nk)->escape_state() == PointsToNode::GlobalEscape) |
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1537 worklist.push(nk); |
0 | 1538 } |
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1539 // mark all nodes reachable from GlobalEscape nodes |
0 | 1540 while(worklist.length() > 0) { |
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1541 PointsToNode* ptn = ptnode_adr(worklist.pop()); |
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1542 uint e_cnt = ptn->edge_count(); |
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1543 for (uint ei = 0; ei < e_cnt; ei++) { |
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1544 uint npi = ptn->edge_target(ei); |
0 | 1545 PointsToNode *np = ptnode_adr(npi); |
65 | 1546 if (np->escape_state() < PointsToNode::GlobalEscape) { |
0 | 1547 np->set_escape_state(PointsToNode::GlobalEscape); |
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1548 worklist.push(npi); |
0 | 1549 } |
1550 } | |
1551 } | |
1552 | |
1553 // push all ArgEscape nodes on the worklist | |
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1554 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1555 int nk = cg_worklist.at(next); |
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1556 if (ptnode_adr(nk)->escape_state() == PointsToNode::ArgEscape) |
0 | 1557 worklist.push(nk); |
1558 } | |
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1559 // mark all nodes reachable from ArgEscape nodes |
0 | 1560 while(worklist.length() > 0) { |
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1561 PointsToNode* ptn = ptnode_adr(worklist.pop()); |
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1562 if (ptn->node_type() == PointsToNode::JavaObject) |
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1563 has_non_escaping_obj = true; // Non GlobalEscape |
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1564 uint e_cnt = ptn->edge_count(); |
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1565 for (uint ei = 0; ei < e_cnt; ei++) { |
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1566 uint npi = ptn->edge_target(ei); |
0 | 1567 PointsToNode *np = ptnode_adr(npi); |
65 | 1568 if (np->escape_state() < PointsToNode::ArgEscape) { |
0 | 1569 np->set_escape_state(PointsToNode::ArgEscape); |
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1570 worklist.push(npi); |
0 | 1571 } |
1572 } | |
1573 } | |
65 | 1574 |
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1575 GrowableArray<Node*> alloc_worklist; |
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1576 |
65 | 1577 // push all NoEscape nodes on the worklist |
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1578 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1579 int nk = cg_worklist.at(next); |
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1580 if (ptnode_adr(nk)->escape_state() == PointsToNode::NoEscape) |
65 | 1581 worklist.push(nk); |
1582 } | |
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1583 // mark all nodes reachable from NoEscape nodes |
65 | 1584 while(worklist.length() > 0) { |
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1585 PointsToNode* ptn = ptnode_adr(worklist.pop()); |
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1586 if (ptn->node_type() == PointsToNode::JavaObject) |
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1587 has_non_escaping_obj = true; // Non GlobalEscape |
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1588 Node* n = ptn->_node; |
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1589 if (n->is_Allocate() && ptn->_scalar_replaceable ) { |
605 | 1590 // Push scalar replaceable allocations on alloc_worklist |
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1591 // for processing in split_unique_types(). |
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1592 alloc_worklist.append(n); |
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1593 } |
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1594 uint e_cnt = ptn->edge_count(); |
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1595 for (uint ei = 0; ei < e_cnt; ei++) { |
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1596 uint npi = ptn->edge_target(ei); |
65 | 1597 PointsToNode *np = ptnode_adr(npi); |
1598 if (np->escape_state() < PointsToNode::NoEscape) { | |
1599 np->set_escape_state(PointsToNode::NoEscape); | |
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1600 worklist.push(npi); |
65 | 1601 } |
1602 } | |
1603 } | |
1604 | |
0 | 1605 _collecting = false; |
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1606 assert(C->unique() == nodes_size(), "there should be no new ideal nodes during ConnectionGraph build"); |
0 | 1607 |
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1608 bool has_scalar_replaceable_candidates = alloc_worklist.length() > 0; |
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1609 if ( has_scalar_replaceable_candidates && |
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1610 C->AliasLevel() >= 3 && EliminateAllocations ) { |
0 | 1611 |
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1612 // Now use the escape information to create unique types for |
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1613 // scalar replaceable objects. |
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1614 split_unique_types(alloc_worklist); |
0 | 1615 |
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1616 if (C->failing()) return false; |
0 | 1617 |
65 | 1618 // Clean up after split unique types. |
1619 ResourceMark rm; | |
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1620 PhaseRemoveUseless pru(C->initial_gvn(), C->for_igvn()); |
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1621 |
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1622 C->print_method("After Escape Analysis", 2); |
0 | 1623 |
65 | 1624 #ifdef ASSERT |
244
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1625 } else if (Verbose && (PrintEscapeAnalysis || PrintEliminateAllocations)) { |
65 | 1626 tty->print("=== No allocations eliminated for "); |
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1627 C->method()->print_short_name(); |
65 | 1628 if(!EliminateAllocations) { |
1629 tty->print(" since EliminateAllocations is off ==="); | |
244
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1630 } else if(!has_scalar_replaceable_candidates) { |
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1631 tty->print(" since there are no scalar replaceable candidates ==="); |
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1632 } else if(C->AliasLevel() < 3) { |
65 | 1633 tty->print(" since AliasLevel < 3 ==="); |
0 | 1634 } |
65 | 1635 tty->cr(); |
1636 #endif | |
0 | 1637 } |
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1638 return has_non_escaping_obj; |
0 | 1639 } |
1640 | |
1641 void ConnectionGraph::process_call_arguments(CallNode *call, PhaseTransform *phase) { | |
1642 | |
1643 switch (call->Opcode()) { | |
65 | 1644 #ifdef ASSERT |
0 | 1645 case Op_Allocate: |
1646 case Op_AllocateArray: | |
1647 case Op_Lock: | |
1648 case Op_Unlock: | |
65 | 1649 assert(false, "should be done already"); |
0 | 1650 break; |
65 | 1651 #endif |
1652 case Op_CallLeafNoFP: | |
1653 { | |
1654 // Stub calls, objects do not escape but they are not scale replaceable. | |
1655 // Adjust escape state for outgoing arguments. | |
1656 const TypeTuple * d = call->tf()->domain(); | |
1657 VectorSet ptset(Thread::current()->resource_area()); | |
1658 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
1659 const Type* at = d->field_at(i); | |
1660 Node *arg = call->in(i)->uncast(); | |
1661 const Type *aat = phase->type(arg); | |
1662 if (!arg->is_top() && at->isa_ptr() && aat->isa_ptr()) { | |
1663 assert(aat == Type::TOP || aat == TypePtr::NULL_PTR || | |
1664 aat->isa_ptr() != NULL, "expecting an Ptr"); | |
1665 set_escape_state(arg->_idx, PointsToNode::ArgEscape); | |
1666 if (arg->is_AddP()) { | |
1667 // | |
1668 // The inline_native_clone() case when the arraycopy stub is called | |
1669 // after the allocation before Initialize and CheckCastPP nodes. | |
1670 // | |
1671 // Set AddP's base (Allocate) as not scalar replaceable since | |
1672 // pointer to the base (with offset) is passed as argument. | |
1673 // | |
1674 arg = get_addp_base(arg); | |
1675 } | |
1676 ptset.Clear(); | |
1677 PointsTo(ptset, arg, phase); | |
1678 for( VectorSetI j(&ptset); j.test(); ++j ) { | |
1679 uint pt = j.elem; | |
1680 set_escape_state(pt, PointsToNode::ArgEscape); | |
1681 } | |
1682 } | |
1683 } | |
1684 break; | |
1685 } | |
0 | 1686 |
1687 case Op_CallStaticJava: | |
1688 // For a static call, we know exactly what method is being called. | |
1689 // Use bytecode estimator to record the call's escape affects | |
1690 { | |
1691 ciMethod *meth = call->as_CallJava()->method(); | |
65 | 1692 BCEscapeAnalyzer *call_analyzer = (meth !=NULL) ? meth->get_bcea() : NULL; |
1693 // fall-through if not a Java method or no analyzer information | |
1694 if (call_analyzer != NULL) { | |
0 | 1695 const TypeTuple * d = call->tf()->domain(); |
1696 VectorSet ptset(Thread::current()->resource_area()); | |
65 | 1697 bool copy_dependencies = false; |
0 | 1698 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
1699 const Type* at = d->field_at(i); | |
1700 int k = i - TypeFunc::Parms; | |
1701 | |
1702 if (at->isa_oopptr() != NULL) { | |
65 | 1703 Node *arg = call->in(i)->uncast(); |
0 | 1704 |
65 | 1705 bool global_escapes = false; |
1706 bool fields_escapes = false; | |
1707 if (!call_analyzer->is_arg_stack(k)) { | |
1708 // The argument global escapes, mark everything it could point to | |
1709 set_escape_state(arg->_idx, PointsToNode::GlobalEscape); | |
1710 global_escapes = true; | |
1711 } else { | |
1712 if (!call_analyzer->is_arg_local(k)) { | |
1713 // The argument itself doesn't escape, but any fields might | |
1714 fields_escapes = true; | |
0 | 1715 } |
65 | 1716 set_escape_state(arg->_idx, PointsToNode::ArgEscape); |
1717 copy_dependencies = true; | |
1718 } | |
1719 | |
1720 ptset.Clear(); | |
1721 PointsTo(ptset, arg, phase); | |
1722 for( VectorSetI j(&ptset); j.test(); ++j ) { | |
1723 uint pt = j.elem; | |
1724 if (global_escapes) { | |
1725 //The argument global escapes, mark everything it could point to | |
1726 set_escape_state(pt, PointsToNode::GlobalEscape); | |
1727 } else { | |
1728 if (fields_escapes) { | |
1729 // The argument itself doesn't escape, but any fields might | |
1730 add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); | |
1731 } | |
1732 set_escape_state(pt, PointsToNode::ArgEscape); | |
0 | 1733 } |
1734 } | |
1735 } | |
1736 } | |
65 | 1737 if (copy_dependencies) |
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1738 call_analyzer->copy_dependencies(_compile->dependencies()); |
0 | 1739 break; |
1740 } | |
1741 } | |
1742 | |
1743 default: | |
65 | 1744 // Fall-through here if not a Java method or no analyzer information |
1745 // or some other type of call, assume the worst case: all arguments | |
0 | 1746 // globally escape. |
1747 { | |
1748 // adjust escape state for outgoing arguments | |
1749 const TypeTuple * d = call->tf()->domain(); | |
1750 VectorSet ptset(Thread::current()->resource_area()); | |
1751 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
1752 const Type* at = d->field_at(i); | |
1753 if (at->isa_oopptr() != NULL) { | |
65 | 1754 Node *arg = call->in(i)->uncast(); |
1755 set_escape_state(arg->_idx, PointsToNode::GlobalEscape); | |
0 | 1756 ptset.Clear(); |
1757 PointsTo(ptset, arg, phase); | |
1758 for( VectorSetI j(&ptset); j.test(); ++j ) { | |
1759 uint pt = j.elem; | |
1760 set_escape_state(pt, PointsToNode::GlobalEscape); | |
1761 } | |
1762 } | |
1763 } | |
1764 } | |
1765 } | |
1766 } | |
1767 void ConnectionGraph::process_call_result(ProjNode *resproj, PhaseTransform *phase) { | |
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1768 CallNode *call = resproj->in(0)->as_Call(); |
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1769 uint call_idx = call->_idx; |
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1770 uint resproj_idx = resproj->_idx; |
0 | 1771 |
1772 switch (call->Opcode()) { | |
1773 case Op_Allocate: | |
1774 { | |
1775 Node *k = call->in(AllocateNode::KlassNode); | |
1776 const TypeKlassPtr *kt; | |
1777 if (k->Opcode() == Op_LoadKlass) { | |
1778 kt = k->as_Load()->type()->isa_klassptr(); | |
1779 } else { | |
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1780 // Also works for DecodeN(LoadNKlass). |
0 | 1781 kt = k->as_Type()->type()->isa_klassptr(); |
1782 } | |
1783 assert(kt != NULL, "TypeKlassPtr required."); | |
1784 ciKlass* cik = kt->klass(); | |
1785 ciInstanceKlass* ciik = cik->as_instance_klass(); | |
1786 | |
65 | 1787 PointsToNode::EscapeState es; |
1788 uint edge_to; | |
0 | 1789 if (cik->is_subclass_of(_compile->env()->Thread_klass()) || ciik->has_finalizer()) { |
65 | 1790 es = PointsToNode::GlobalEscape; |
1791 edge_to = _phantom_object; // Could not be worse | |
0 | 1792 } else { |
65 | 1793 es = PointsToNode::NoEscape; |
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1794 edge_to = call_idx; |
0 | 1795 } |
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1796 set_escape_state(call_idx, es); |
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1797 add_pointsto_edge(resproj_idx, edge_to); |
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1798 _processed.set(resproj_idx); |
0 | 1799 break; |
1800 } | |
1801 | |
1802 case Op_AllocateArray: | |
1803 { | |
65 | 1804 int length = call->in(AllocateNode::ALength)->find_int_con(-1); |
1805 if (length < 0 || length > EliminateAllocationArraySizeLimit) { | |
1806 // Not scalar replaceable if the length is not constant or too big. | |
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1807 ptnode_adr(call_idx)->_scalar_replaceable = false; |
65 | 1808 } |
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1809 set_escape_state(call_idx, PointsToNode::NoEscape); |
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1810 add_pointsto_edge(resproj_idx, call_idx); |
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1811 _processed.set(resproj_idx); |
0 | 1812 break; |
1813 } | |
1814 | |
1815 case Op_CallStaticJava: | |
1816 // For a static call, we know exactly what method is being called. | |
1817 // Use bytecode estimator to record whether the call's return value escapes | |
1818 { | |
65 | 1819 bool done = true; |
0 | 1820 const TypeTuple *r = call->tf()->range(); |
1821 const Type* ret_type = NULL; | |
1822 | |
1823 if (r->cnt() > TypeFunc::Parms) | |
1824 ret_type = r->field_at(TypeFunc::Parms); | |
1825 | |
1826 // Note: we use isa_ptr() instead of isa_oopptr() here because the | |
1827 // _multianewarray functions return a TypeRawPtr. | |
65 | 1828 if (ret_type == NULL || ret_type->isa_ptr() == NULL) { |
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1829 _processed.set(resproj_idx); |
0 | 1830 break; // doesn't return a pointer type |
65 | 1831 } |
0 | 1832 ciMethod *meth = call->as_CallJava()->method(); |
65 | 1833 const TypeTuple * d = call->tf()->domain(); |
0 | 1834 if (meth == NULL) { |
1835 // not a Java method, assume global escape | |
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1836 set_escape_state(call_idx, PointsToNode::GlobalEscape); |
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1837 add_pointsto_edge(resproj_idx, _phantom_object); |
0 | 1838 } else { |
65 | 1839 BCEscapeAnalyzer *call_analyzer = meth->get_bcea(); |
1840 bool copy_dependencies = false; | |
0 | 1841 |
65 | 1842 if (call_analyzer->is_return_allocated()) { |
1843 // Returns a newly allocated unescaped object, simply | |
1844 // update dependency information. | |
1845 // Mark it as NoEscape so that objects referenced by | |
1846 // it's fields will be marked as NoEscape at least. | |
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1847 set_escape_state(call_idx, PointsToNode::NoEscape); |
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1848 add_pointsto_edge(resproj_idx, call_idx); |
65 | 1849 copy_dependencies = true; |
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1850 } else if (call_analyzer->is_return_local()) { |
0 | 1851 // determine whether any arguments are returned |
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1852 set_escape_state(call_idx, PointsToNode::NoEscape); |
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1853 bool ret_arg = false; |
0 | 1854 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
1855 const Type* at = d->field_at(i); | |
1856 | |
1857 if (at->isa_oopptr() != NULL) { | |
65 | 1858 Node *arg = call->in(i)->uncast(); |
0 | 1859 |
65 | 1860 if (call_analyzer->is_arg_returned(i - TypeFunc::Parms)) { |
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1861 ret_arg = true; |
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1862 PointsToNode *arg_esp = ptnode_adr(arg->_idx); |
65 | 1863 if (arg_esp->node_type() == PointsToNode::UnknownType) |
1864 done = false; | |
1865 else if (arg_esp->node_type() == PointsToNode::JavaObject) | |
244
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1866 add_pointsto_edge(resproj_idx, arg->_idx); |
0 | 1867 else |
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1868 add_deferred_edge(resproj_idx, arg->_idx); |
0 | 1869 arg_esp->_hidden_alias = true; |
1870 } | |
1871 } | |
1872 } | |
307
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1873 if (done && !ret_arg) { |
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1874 // Returns unknown object. |
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1875 set_escape_state(call_idx, PointsToNode::GlobalEscape); |
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1876 add_pointsto_edge(resproj_idx, _phantom_object); |
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1877 } |
65 | 1878 copy_dependencies = true; |
0 | 1879 } else { |
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1880 set_escape_state(call_idx, PointsToNode::GlobalEscape); |
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1881 add_pointsto_edge(resproj_idx, _phantom_object); |
65 | 1882 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
1883 const Type* at = d->field_at(i); | |
1884 if (at->isa_oopptr() != NULL) { | |
1885 Node *arg = call->in(i)->uncast(); | |
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1886 PointsToNode *arg_esp = ptnode_adr(arg->_idx); |
65 | 1887 arg_esp->_hidden_alias = true; |
1888 } | |
1889 } | |
0 | 1890 } |
65 | 1891 if (copy_dependencies) |
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1892 call_analyzer->copy_dependencies(_compile->dependencies()); |
0 | 1893 } |
65 | 1894 if (done) |
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1895 _processed.set(resproj_idx); |
0 | 1896 break; |
1897 } | |
1898 | |
1899 default: | |
1900 // Some other type of call, assume the worst case that the | |
1901 // returned value, if any, globally escapes. | |
1902 { | |
1903 const TypeTuple *r = call->tf()->range(); | |
1904 if (r->cnt() > TypeFunc::Parms) { | |
1905 const Type* ret_type = r->field_at(TypeFunc::Parms); | |
1906 | |
1907 // Note: we use isa_ptr() instead of isa_oopptr() here because the | |
1908 // _multianewarray functions return a TypeRawPtr. | |
1909 if (ret_type->isa_ptr() != NULL) { | |
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1910 set_escape_state(call_idx, PointsToNode::GlobalEscape); |
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1911 add_pointsto_edge(resproj_idx, _phantom_object); |
0 | 1912 } |
1913 } | |
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1914 _processed.set(resproj_idx); |
0 | 1915 } |
1916 } | |
1917 } | |
1918 | |
65 | 1919 // Populate Connection Graph with Ideal nodes and create simple |
1920 // connection graph edges (do not need to check the node_type of inputs | |
1921 // or to call PointsTo() to walk the connection graph). | |
1922 void ConnectionGraph::record_for_escape_analysis(Node *n, PhaseTransform *phase) { | |
1923 if (_processed.test(n->_idx)) | |
1924 return; // No need to redefine node's state. | |
1925 | |
1926 if (n->is_Call()) { | |
1927 // Arguments to allocation and locking don't escape. | |
1928 if (n->is_Allocate()) { | |
1929 add_node(n, PointsToNode::JavaObject, PointsToNode::UnknownEscape, true); | |
1930 record_for_optimizer(n); | |
1931 } else if (n->is_Lock() || n->is_Unlock()) { | |
1932 // Put Lock and Unlock nodes on IGVN worklist to process them during | |
1933 // the first IGVN optimization when escape information is still available. | |
1934 record_for_optimizer(n); | |
1935 _processed.set(n->_idx); | |
1936 } else { | |
1937 // Have to process call's arguments first. | |
1938 PointsToNode::NodeType nt = PointsToNode::UnknownType; | |
1939 | |
1940 // Check if a call returns an object. | |
1941 const TypeTuple *r = n->as_Call()->tf()->range(); | |
244
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1942 if (n->is_CallStaticJava() && r->cnt() > TypeFunc::Parms && |
65 | 1943 n->as_Call()->proj_out(TypeFunc::Parms) != NULL) { |
1944 // Note: use isa_ptr() instead of isa_oopptr() here because | |
1945 // the _multianewarray functions return a TypeRawPtr. | |
1946 if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) { | |
1947 nt = PointsToNode::JavaObject; | |
1948 } | |
1949 } | |
1950 add_node(n, nt, PointsToNode::UnknownEscape, false); | |
1951 } | |
1952 return; | |
1953 } | |
1954 | |
1955 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because | |
1956 // ThreadLocal has RawPrt type. | |
1957 switch (n->Opcode()) { | |
1958 case Op_AddP: | |
1959 { | |
1960 add_node(n, PointsToNode::Field, PointsToNode::UnknownEscape, false); | |
1961 break; | |
1962 } | |
1963 case Op_CastX2P: | |
1964 { // "Unsafe" memory access. | |
1965 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
1966 break; | |
1967 } | |
1968 case Op_CastPP: | |
1969 case Op_CheckCastPP: | |
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1970 case Op_EncodeP: |
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1971 case Op_DecodeN: |
65 | 1972 { |
1973 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
1974 int ti = n->in(1)->_idx; | |
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1975 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
65 | 1976 if (nt == PointsToNode::UnknownType) { |
1977 _delayed_worklist.push(n); // Process it later. | |
1978 break; | |
1979 } else if (nt == PointsToNode::JavaObject) { | |
1980 add_pointsto_edge(n->_idx, ti); | |
1981 } else { | |
1982 add_deferred_edge(n->_idx, ti); | |
1983 } | |
1984 _processed.set(n->_idx); | |
1985 break; | |
1986 } | |
1987 case Op_ConP: | |
1988 { | |
1989 // assume all pointer constants globally escape except for null | |
1990 PointsToNode::EscapeState es; | |
1991 if (phase->type(n) == TypePtr::NULL_PTR) | |
1992 es = PointsToNode::NoEscape; | |
1993 else | |
1994 es = PointsToNode::GlobalEscape; | |
0 | 1995 |
65 | 1996 add_node(n, PointsToNode::JavaObject, es, true); |
1997 break; | |
1998 } | |
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1999 case Op_ConN: |
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2000 { |
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2001 // assume all narrow oop constants globally escape except for null |
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2002 PointsToNode::EscapeState es; |
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2003 if (phase->type(n) == TypeNarrowOop::NULL_PTR) |
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2004 es = PointsToNode::NoEscape; |
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2005 else |
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2006 es = PointsToNode::GlobalEscape; |
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2007 |
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2008 add_node(n, PointsToNode::JavaObject, es, true); |
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2009 break; |
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2010 } |
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2011 case Op_CreateEx: |
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2012 { |
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2013 // assume that all exception objects globally escape |
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2014 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); |
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2015 break; |
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2016 } |
65 | 2017 case Op_LoadKlass: |
164
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2018 case Op_LoadNKlass: |
65 | 2019 { |
2020 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
2021 break; | |
2022 } | |
2023 case Op_LoadP: | |
113
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2024 case Op_LoadN: |
65 | 2025 { |
2026 const Type *t = phase->type(n); | |
253
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2027 if (t->make_ptr() == NULL) { |
65 | 2028 _processed.set(n->_idx); |
2029 return; | |
2030 } | |
2031 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2032 break; | |
2033 } | |
2034 case Op_Parm: | |
2035 { | |
2036 _processed.set(n->_idx); // No need to redefine it state. | |
2037 uint con = n->as_Proj()->_con; | |
2038 if (con < TypeFunc::Parms) | |
2039 return; | |
2040 const Type *t = n->in(0)->as_Start()->_domain->field_at(con); | |
2041 if (t->isa_ptr() == NULL) | |
2042 return; | |
2043 // We have to assume all input parameters globally escape | |
2044 // (Note: passing 'false' since _processed is already set). | |
2045 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, false); | |
2046 break; | |
2047 } | |
2048 case Op_Phi: | |
2049 { | |
253
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2050 const Type *t = n->as_Phi()->type(); |
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2051 if (t->make_ptr() == NULL) { |
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2052 // nothing to do if not an oop or narrow oop |
65 | 2053 _processed.set(n->_idx); |
2054 return; | |
2055 } | |
2056 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2057 uint i; | |
2058 for (i = 1; i < n->req() ; i++) { | |
2059 Node* in = n->in(i); | |
2060 if (in == NULL) | |
2061 continue; // ignore NULL | |
2062 in = in->uncast(); | |
2063 if (in->is_top() || in == n) | |
2064 continue; // ignore top or inputs which go back this node | |
2065 int ti = in->_idx; | |
244
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2066 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
65 | 2067 if (nt == PointsToNode::UnknownType) { |
2068 break; | |
2069 } else if (nt == PointsToNode::JavaObject) { | |
2070 add_pointsto_edge(n->_idx, ti); | |
2071 } else { | |
2072 add_deferred_edge(n->_idx, ti); | |
2073 } | |
2074 } | |
2075 if (i >= n->req()) | |
2076 _processed.set(n->_idx); | |
2077 else | |
2078 _delayed_worklist.push(n); | |
2079 break; | |
2080 } | |
2081 case Op_Proj: | |
2082 { | |
2083 // we are only interested in the result projection from a call | |
2084 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { | |
2085 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2086 process_call_result(n->as_Proj(), phase); | |
2087 if (!_processed.test(n->_idx)) { | |
2088 // The call's result may need to be processed later if the call | |
2089 // returns it's argument and the argument is not processed yet. | |
2090 _delayed_worklist.push(n); | |
2091 } | |
2092 } else { | |
2093 _processed.set(n->_idx); | |
2094 } | |
2095 break; | |
2096 } | |
2097 case Op_Return: | |
2098 { | |
2099 if( n->req() > TypeFunc::Parms && | |
2100 phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { | |
2101 // Treat Return value as LocalVar with GlobalEscape escape state. | |
2102 add_node(n, PointsToNode::LocalVar, PointsToNode::GlobalEscape, false); | |
2103 int ti = n->in(TypeFunc::Parms)->_idx; | |
244
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2104 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
65 | 2105 if (nt == PointsToNode::UnknownType) { |
2106 _delayed_worklist.push(n); // Process it later. | |
2107 break; | |
2108 } else if (nt == PointsToNode::JavaObject) { | |
2109 add_pointsto_edge(n->_idx, ti); | |
2110 } else { | |
2111 add_deferred_edge(n->_idx, ti); | |
2112 } | |
2113 } | |
2114 _processed.set(n->_idx); | |
2115 break; | |
2116 } | |
2117 case Op_StoreP: | |
113
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2118 case Op_StoreN: |
65 | 2119 { |
2120 const Type *adr_type = phase->type(n->in(MemNode::Address)); | |
221
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2121 adr_type = adr_type->make_ptr(); |
65 | 2122 if (adr_type->isa_oopptr()) { |
2123 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2124 } else { | |
2125 Node* adr = n->in(MemNode::Address); | |
2126 if (adr->is_AddP() && phase->type(adr) == TypeRawPtr::NOTNULL && | |
2127 adr->in(AddPNode::Address)->is_Proj() && | |
2128 adr->in(AddPNode::Address)->in(0)->is_Allocate()) { | |
2129 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2130 // We are computing a raw address for a store captured | |
2131 // by an Initialize compute an appropriate address type. | |
2132 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); | |
2133 assert(offs != Type::OffsetBot, "offset must be a constant"); | |
2134 } else { | |
2135 _processed.set(n->_idx); | |
2136 return; | |
2137 } | |
2138 } | |
2139 break; | |
2140 } | |
2141 case Op_StorePConditional: | |
2142 case Op_CompareAndSwapP: | |
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2143 case Op_CompareAndSwapN: |
65 | 2144 { |
2145 const Type *adr_type = phase->type(n->in(MemNode::Address)); | |
221
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2146 adr_type = adr_type->make_ptr(); |
65 | 2147 if (adr_type->isa_oopptr()) { |
2148 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2149 } else { | |
2150 _processed.set(n->_idx); | |
2151 return; | |
2152 } | |
2153 break; | |
2154 } | |
2155 case Op_ThreadLocal: | |
2156 { | |
2157 add_node(n, PointsToNode::JavaObject, PointsToNode::ArgEscape, true); | |
2158 break; | |
2159 } | |
2160 default: | |
2161 ; | |
2162 // nothing to do | |
2163 } | |
2164 return; | |
2165 } | |
2166 | |
2167 void ConnectionGraph::build_connection_graph(Node *n, PhaseTransform *phase) { | |
244
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2168 uint n_idx = n->_idx; |
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2169 |
65 | 2170 // Don't set processed bit for AddP, LoadP, StoreP since |
2171 // they may need more then one pass to process. | |
244
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2172 if (_processed.test(n_idx)) |
65 | 2173 return; // No need to redefine node's state. |
2174 | |
0 | 2175 if (n->is_Call()) { |
2176 CallNode *call = n->as_Call(); | |
2177 process_call_arguments(call, phase); | |
244
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2178 _processed.set(n_idx); |
0 | 2179 return; |
2180 } | |
2181 | |
65 | 2182 switch (n->Opcode()) { |
0 | 2183 case Op_AddP: |
2184 { | |
65 | 2185 Node *base = get_addp_base(n); |
2186 // Create a field edge to this node from everything base could point to. | |
0 | 2187 VectorSet ptset(Thread::current()->resource_area()); |
2188 PointsTo(ptset, base, phase); | |
2189 for( VectorSetI i(&ptset); i.test(); ++i ) { | |
2190 uint pt = i.elem; | |
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2191 add_field_edge(pt, n_idx, address_offset(n, phase)); |
65 | 2192 } |
2193 break; | |
2194 } | |
2195 case Op_CastX2P: | |
2196 { | |
2197 assert(false, "Op_CastX2P"); | |
2198 break; | |
2199 } | |
2200 case Op_CastPP: | |
2201 case Op_CheckCastPP: | |
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2202 case Op_EncodeP: |
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2203 case Op_DecodeN: |
65 | 2204 { |
2205 int ti = n->in(1)->_idx; | |
244
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2206 if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) { |
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2207 add_pointsto_edge(n_idx, ti); |
65 | 2208 } else { |
244
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2209 add_deferred_edge(n_idx, ti); |
65 | 2210 } |
244
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2211 _processed.set(n_idx); |
65 | 2212 break; |
2213 } | |
2214 case Op_ConP: | |
2215 { | |
2216 assert(false, "Op_ConP"); | |
2217 break; | |
2218 } | |
163 | 2219 case Op_ConN: |
2220 { | |
2221 assert(false, "Op_ConN"); | |
2222 break; | |
2223 } | |
65 | 2224 case Op_CreateEx: |
2225 { | |
2226 assert(false, "Op_CreateEx"); | |
2227 break; | |
2228 } | |
2229 case Op_LoadKlass: | |
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2230 case Op_LoadNKlass: |
65 | 2231 { |
2232 assert(false, "Op_LoadKlass"); | |
2233 break; | |
2234 } | |
2235 case Op_LoadP: | |
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2236 case Op_LoadN: |
65 | 2237 { |
2238 const Type *t = phase->type(n); | |
2239 #ifdef ASSERT | |
253
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2240 if (t->make_ptr() == NULL) |
65 | 2241 assert(false, "Op_LoadP"); |
2242 #endif | |
2243 | |
2244 Node* adr = n->in(MemNode::Address)->uncast(); | |
2245 const Type *adr_type = phase->type(adr); | |
2246 Node* adr_base; | |
2247 if (adr->is_AddP()) { | |
2248 adr_base = get_addp_base(adr); | |
2249 } else { | |
2250 adr_base = adr; | |
2251 } | |
2252 | |
2253 // For everything "adr_base" could point to, create a deferred edge from | |
2254 // this node to each field with the same offset. | |
2255 VectorSet ptset(Thread::current()->resource_area()); | |
2256 PointsTo(ptset, adr_base, phase); | |
2257 int offset = address_offset(adr, phase); | |
2258 for( VectorSetI i(&ptset); i.test(); ++i ) { | |
2259 uint pt = i.elem; | |
244
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2260 add_deferred_edge_to_fields(n_idx, pt, offset); |
0 | 2261 } |
2262 break; | |
2263 } | |
2264 case Op_Parm: | |
2265 { | |
65 | 2266 assert(false, "Op_Parm"); |
0 | 2267 break; |
2268 } | |
2269 case Op_Phi: | |
2270 { | |
65 | 2271 #ifdef ASSERT |
253
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2272 const Type *t = n->as_Phi()->type(); |
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2273 if (t->make_ptr() == NULL) |
65 | 2274 assert(false, "Op_Phi"); |
2275 #endif | |
2276 for (uint i = 1; i < n->req() ; i++) { | |
2277 Node* in = n->in(i); | |
2278 if (in == NULL) | |
2279 continue; // ignore NULL | |
2280 in = in->uncast(); | |
2281 if (in->is_top() || in == n) | |
2282 continue; // ignore top or inputs which go back this node | |
2283 int ti = in->_idx; | |
307
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2284 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
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2285 assert(nt != PointsToNode::UnknownType, "all nodes should be known"); |
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2286 if (nt == PointsToNode::JavaObject) { |
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2287 add_pointsto_edge(n_idx, ti); |
65 | 2288 } else { |
244
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2289 add_deferred_edge(n_idx, ti); |
65 | 2290 } |
2291 } | |
244
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2292 _processed.set(n_idx); |
0 | 2293 break; |
2294 } | |
65 | 2295 case Op_Proj: |
0 | 2296 { |
65 | 2297 // we are only interested in the result projection from a call |
2298 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { | |
2299 process_call_result(n->as_Proj(), phase); | |
244
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2300 assert(_processed.test(n_idx), "all call results should be processed"); |
65 | 2301 } else { |
2302 assert(false, "Op_Proj"); | |
2303 } | |
0 | 2304 break; |
2305 } | |
65 | 2306 case Op_Return: |
0 | 2307 { |
65 | 2308 #ifdef ASSERT |
2309 if( n->req() <= TypeFunc::Parms || | |
2310 !phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { | |
2311 assert(false, "Op_Return"); | |
0 | 2312 } |
65 | 2313 #endif |
2314 int ti = n->in(TypeFunc::Parms)->_idx; | |
244
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2315 if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) { |
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2316 add_pointsto_edge(n_idx, ti); |
65 | 2317 } else { |
244
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2318 add_deferred_edge(n_idx, ti); |
65 | 2319 } |
244
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2320 _processed.set(n_idx); |
0 | 2321 break; |
2322 } | |
2323 case Op_StoreP: | |
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2324 case Op_StoreN: |
0 | 2325 case Op_StorePConditional: |
2326 case Op_CompareAndSwapP: | |
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2327 case Op_CompareAndSwapN: |
0 | 2328 { |
2329 Node *adr = n->in(MemNode::Address); | |
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2330 const Type *adr_type = phase->type(adr)->make_ptr(); |
65 | 2331 #ifdef ASSERT |
0 | 2332 if (!adr_type->isa_oopptr()) |
65 | 2333 assert(phase->type(adr) == TypeRawPtr::NOTNULL, "Op_StoreP"); |
2334 #endif | |
0 | 2335 |
65 | 2336 assert(adr->is_AddP(), "expecting an AddP"); |
2337 Node *adr_base = get_addp_base(adr); | |
2338 Node *val = n->in(MemNode::ValueIn)->uncast(); | |
2339 // For everything "adr_base" could point to, create a deferred edge | |
2340 // to "val" from each field with the same offset. | |
0 | 2341 VectorSet ptset(Thread::current()->resource_area()); |
2342 PointsTo(ptset, adr_base, phase); | |
2343 for( VectorSetI i(&ptset); i.test(); ++i ) { | |
2344 uint pt = i.elem; | |
65 | 2345 add_edge_from_fields(pt, val->_idx, address_offset(adr, phase)); |
0 | 2346 } |
2347 break; | |
2348 } | |
65 | 2349 case Op_ThreadLocal: |
0 | 2350 { |
65 | 2351 assert(false, "Op_ThreadLocal"); |
0 | 2352 break; |
2353 } | |
2354 default: | |
2355 ; | |
2356 // nothing to do | |
2357 } | |
2358 } | |
2359 | |
2360 #ifndef PRODUCT | |
2361 void ConnectionGraph::dump() { | |
2362 PhaseGVN *igvn = _compile->initial_gvn(); | |
2363 bool first = true; | |
2364 | |
244
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2365 uint size = nodes_size(); |
65 | 2366 for (uint ni = 0; ni < size; ni++) { |
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2367 PointsToNode *ptn = ptnode_adr(ni); |
65 | 2368 PointsToNode::NodeType ptn_type = ptn->node_type(); |
2369 | |
2370 if (ptn_type != PointsToNode::JavaObject || ptn->_node == NULL) | |
0 | 2371 continue; |
65 | 2372 PointsToNode::EscapeState es = escape_state(ptn->_node, igvn); |
2373 if (ptn->_node->is_Allocate() && (es == PointsToNode::NoEscape || Verbose)) { | |
2374 if (first) { | |
2375 tty->cr(); | |
2376 tty->print("======== Connection graph for "); | |
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2377 _compile->method()->print_short_name(); |
65 | 2378 tty->cr(); |
2379 first = false; | |
2380 } | |
2381 tty->print("%6d ", ni); | |
2382 ptn->dump(); | |
2383 // Print all locals which reference this allocation | |
2384 for (uint li = ni; li < size; li++) { | |
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2385 PointsToNode *ptn_loc = ptnode_adr(li); |
65 | 2386 PointsToNode::NodeType ptn_loc_type = ptn_loc->node_type(); |
2387 if ( ptn_loc_type == PointsToNode::LocalVar && ptn_loc->_node != NULL && | |
2388 ptn_loc->edge_count() == 1 && ptn_loc->edge_target(0) == ni ) { | |
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2389 ptnode_adr(li)->dump(false); |
0 | 2390 } |
2391 } | |
65 | 2392 if (Verbose) { |
2393 // Print all fields which reference this allocation | |
2394 for (uint i = 0; i < ptn->edge_count(); i++) { | |
2395 uint ei = ptn->edge_target(i); | |
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2396 ptnode_adr(ei)->dump(false); |
65 | 2397 } |
2398 } | |
2399 tty->cr(); | |
0 | 2400 } |
2401 } | |
2402 } | |
2403 #endif |