Mercurial > hg > truffle
annotate src/share/vm/opto/escape.cpp @ 2645:b2c1e959be46
Clean up around BlockBegin / StdEntry.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 14:34:29 +0200 |
parents | 55973726c600 |
children | 66b0e2371912 |
rev | line source |
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0 | 1 /* |
2249 | 2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/bcEscapeAnalyzer.hpp" | |
27 #include "libadt/vectset.hpp" | |
28 #include "memory/allocation.hpp" | |
29 #include "opto/c2compiler.hpp" | |
30 #include "opto/callnode.hpp" | |
31 #include "opto/cfgnode.hpp" | |
32 #include "opto/compile.hpp" | |
33 #include "opto/escape.hpp" | |
34 #include "opto/phaseX.hpp" | |
35 #include "opto/rootnode.hpp" | |
0 | 36 |
37 void PointsToNode::add_edge(uint targIdx, PointsToNode::EdgeType et) { | |
38 uint v = (targIdx << EdgeShift) + ((uint) et); | |
39 if (_edges == NULL) { | |
40 Arena *a = Compile::current()->comp_arena(); | |
41 _edges = new(a) GrowableArray<uint>(a, INITIAL_EDGE_COUNT, 0, 0); | |
42 } | |
43 _edges->append_if_missing(v); | |
44 } | |
45 | |
46 void PointsToNode::remove_edge(uint targIdx, PointsToNode::EdgeType et) { | |
47 uint v = (targIdx << EdgeShift) + ((uint) et); | |
48 | |
49 _edges->remove(v); | |
50 } | |
51 | |
52 #ifndef PRODUCT | |
77 | 53 static const char *node_type_names[] = { |
0 | 54 "UnknownType", |
55 "JavaObject", | |
56 "LocalVar", | |
57 "Field" | |
58 }; | |
59 | |
77 | 60 static const char *esc_names[] = { |
0 | 61 "UnknownEscape", |
65 | 62 "NoEscape", |
63 "ArgEscape", | |
64 "GlobalEscape" | |
0 | 65 }; |
66 | |
77 | 67 static const char *edge_type_suffix[] = { |
0 | 68 "?", // UnknownEdge |
69 "P", // PointsToEdge | |
70 "D", // DeferredEdge | |
71 "F" // FieldEdge | |
72 }; | |
73 | |
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74 void PointsToNode::dump(bool print_state) const { |
0 | 75 NodeType nt = node_type(); |
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76 tty->print("%s ", node_type_names[(int) nt]); |
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77 if (print_state) { |
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78 EscapeState es = escape_state(); |
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79 tty->print("%s %s ", esc_names[(int) es], _scalar_replaceable ? "":"NSR"); |
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80 } |
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81 tty->print("[["); |
0 | 82 for (uint i = 0; i < edge_count(); i++) { |
83 tty->print(" %d%s", edge_target(i), edge_type_suffix[(int) edge_type(i)]); | |
84 } | |
85 tty->print("]] "); | |
86 if (_node == NULL) | |
87 tty->print_cr("<null>"); | |
88 else | |
89 _node->dump(); | |
90 } | |
91 #endif | |
92 | |
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93 ConnectionGraph::ConnectionGraph(Compile * C, PhaseIterGVN *igvn) : |
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94 _nodes(C->comp_arena(), C->unique(), C->unique(), PointsToNode()), |
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95 _processed(C->comp_arena()), |
2249 | 96 pt_ptset(C->comp_arena()), |
97 pt_visited(C->comp_arena()), | |
98 pt_worklist(C->comp_arena(), 4, 0, 0), | |
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99 _collecting(true), |
1921 | 100 _progress(false), |
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101 _compile(C), |
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102 _igvn(igvn), |
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103 _node_map(C->comp_arena()) { |
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104 |
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105 _phantom_object = C->top()->_idx, |
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106 add_node(C->top(), PointsToNode::JavaObject, PointsToNode::GlobalEscape,true); |
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107 |
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108 // Add ConP(#NULL) and ConN(#NULL) nodes. |
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109 Node* oop_null = igvn->zerocon(T_OBJECT); |
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110 _oop_null = oop_null->_idx; |
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111 assert(_oop_null < C->unique(), "should be created already"); |
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112 add_node(oop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true); |
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113 |
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114 if (UseCompressedOops) { |
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115 Node* noop_null = igvn->zerocon(T_NARROWOOP); |
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116 _noop_null = noop_null->_idx; |
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117 assert(_noop_null < C->unique(), "should be created already"); |
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118 add_node(noop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true); |
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119 } |
0 | 120 } |
121 | |
122 void ConnectionGraph::add_pointsto_edge(uint from_i, uint to_i) { | |
123 PointsToNode *f = ptnode_adr(from_i); | |
124 PointsToNode *t = ptnode_adr(to_i); | |
125 | |
126 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
127 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of PointsTo edge"); | |
128 assert(t->node_type() == PointsToNode::JavaObject, "invalid destination of PointsTo edge"); | |
1921 | 129 add_edge(f, to_i, PointsToNode::PointsToEdge); |
0 | 130 } |
131 | |
132 void ConnectionGraph::add_deferred_edge(uint from_i, uint to_i) { | |
133 PointsToNode *f = ptnode_adr(from_i); | |
134 PointsToNode *t = ptnode_adr(to_i); | |
135 | |
136 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
137 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of Deferred edge"); | |
138 assert(t->node_type() == PointsToNode::LocalVar || t->node_type() == PointsToNode::Field, "invalid destination of Deferred edge"); | |
139 // don't add a self-referential edge, this can occur during removal of | |
140 // deferred edges | |
141 if (from_i != to_i) | |
1921 | 142 add_edge(f, to_i, PointsToNode::DeferredEdge); |
0 | 143 } |
144 | |
65 | 145 int ConnectionGraph::address_offset(Node* adr, PhaseTransform *phase) { |
146 const Type *adr_type = phase->type(adr); | |
147 if (adr->is_AddP() && adr_type->isa_oopptr() == NULL && | |
148 adr->in(AddPNode::Address)->is_Proj() && | |
149 adr->in(AddPNode::Address)->in(0)->is_Allocate()) { | |
150 // We are computing a raw address for a store captured by an Initialize | |
151 // compute an appropriate address type. AddP cases #3 and #5 (see below). | |
152 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); | |
153 assert(offs != Type::OffsetBot || | |
154 adr->in(AddPNode::Address)->in(0)->is_AllocateArray(), | |
155 "offset must be a constant or it is initialization of array"); | |
156 return offs; | |
157 } | |
158 const TypePtr *t_ptr = adr_type->isa_ptr(); | |
0 | 159 assert(t_ptr != NULL, "must be a pointer type"); |
160 return t_ptr->offset(); | |
161 } | |
162 | |
163 void ConnectionGraph::add_field_edge(uint from_i, uint to_i, int offset) { | |
164 PointsToNode *f = ptnode_adr(from_i); | |
165 PointsToNode *t = ptnode_adr(to_i); | |
166 | |
167 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
168 assert(f->node_type() == PointsToNode::JavaObject, "invalid destination of Field edge"); | |
169 assert(t->node_type() == PointsToNode::Field, "invalid destination of Field edge"); | |
170 assert (t->offset() == -1 || t->offset() == offset, "conflicting field offsets"); | |
171 t->set_offset(offset); | |
172 | |
1921 | 173 add_edge(f, to_i, PointsToNode::FieldEdge); |
0 | 174 } |
175 | |
176 void ConnectionGraph::set_escape_state(uint ni, PointsToNode::EscapeState es) { | |
177 PointsToNode *npt = ptnode_adr(ni); | |
178 PointsToNode::EscapeState old_es = npt->escape_state(); | |
179 if (es > old_es) | |
180 npt->set_escape_state(es); | |
181 } | |
182 | |
65 | 183 void ConnectionGraph::add_node(Node *n, PointsToNode::NodeType nt, |
184 PointsToNode::EscapeState es, bool done) { | |
185 PointsToNode* ptadr = ptnode_adr(n->_idx); | |
186 ptadr->_node = n; | |
187 ptadr->set_node_type(nt); | |
188 | |
189 // inline set_escape_state(idx, es); | |
190 PointsToNode::EscapeState old_es = ptadr->escape_state(); | |
191 if (es > old_es) | |
192 ptadr->set_escape_state(es); | |
193 | |
194 if (done) | |
195 _processed.set(n->_idx); | |
196 } | |
197 | |
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198 PointsToNode::EscapeState ConnectionGraph::escape_state(Node *n) { |
0 | 199 uint idx = n->_idx; |
200 PointsToNode::EscapeState es; | |
201 | |
65 | 202 // If we are still collecting or there were no non-escaping allocations |
203 // we don't know the answer yet | |
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204 if (_collecting) |
0 | 205 return PointsToNode::UnknownEscape; |
206 | |
207 // if the node was created after the escape computation, return | |
208 // UnknownEscape | |
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209 if (idx >= nodes_size()) |
0 | 210 return PointsToNode::UnknownEscape; |
211 | |
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212 es = ptnode_adr(idx)->escape_state(); |
0 | 213 |
214 // if we have already computed a value, return it | |
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215 if (es != PointsToNode::UnknownEscape && |
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216 ptnode_adr(idx)->node_type() == PointsToNode::JavaObject) |
0 | 217 return es; |
218 | |
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219 // PointsTo() calls n->uncast() which can return a new ideal node. |
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220 if (n->uncast()->_idx >= nodes_size()) |
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221 return PointsToNode::UnknownEscape; |
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222 |
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223 PointsToNode::EscapeState orig_es = es; |
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224 |
0 | 225 // compute max escape state of anything this node could point to |
2249 | 226 for(VectorSetI i(PointsTo(n)); i.test() && es != PointsToNode::GlobalEscape; ++i) { |
0 | 227 uint pt = i.elem; |
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228 PointsToNode::EscapeState pes = ptnode_adr(pt)->escape_state(); |
0 | 229 if (pes > es) |
230 es = pes; | |
231 } | |
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232 if (orig_es != es) { |
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233 // cache the computed escape state |
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234 assert(es != PointsToNode::UnknownEscape, "should have computed an escape state"); |
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235 ptnode_adr(idx)->set_escape_state(es); |
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236 } // orig_es could be PointsToNode::UnknownEscape |
0 | 237 return es; |
238 } | |
239 | |
2249 | 240 VectorSet* ConnectionGraph::PointsTo(Node * n) { |
241 pt_ptset.Reset(); | |
242 pt_visited.Reset(); | |
243 pt_worklist.clear(); | |
0 | 244 |
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245 #ifdef ASSERT |
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246 Node *orig_n = n; |
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247 #endif |
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248 |
65 | 249 n = n->uncast(); |
244
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250 PointsToNode* npt = ptnode_adr(n->_idx); |
0 | 251 |
252 // If we have a JavaObject, return just that object | |
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253 if (npt->node_type() == PointsToNode::JavaObject) { |
2249 | 254 pt_ptset.set(n->_idx); |
255 return &pt_ptset; | |
0 | 256 } |
124
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257 #ifdef ASSERT |
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258 if (npt->_node == NULL) { |
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259 if (orig_n != n) |
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260 orig_n->dump(); |
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261 n->dump(); |
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262 assert(npt->_node != NULL, "unregistered node"); |
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263 } |
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264 #endif |
2249 | 265 pt_worklist.push(n->_idx); |
266 while(pt_worklist.length() > 0) { | |
267 int ni = pt_worklist.pop(); | |
268 if (pt_visited.test_set(ni)) | |
244
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269 continue; |
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270 |
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271 PointsToNode* pn = ptnode_adr(ni); |
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272 // ensure that all inputs of a Phi have been processed |
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273 assert(!_collecting || !pn->_node->is_Phi() || _processed.test(ni),""); |
0 | 274 |
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275 int edges_processed = 0; |
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276 uint e_cnt = pn->edge_count(); |
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277 for (uint e = 0; e < e_cnt; e++) { |
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278 uint etgt = pn->edge_target(e); |
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279 PointsToNode::EdgeType et = pn->edge_type(e); |
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280 if (et == PointsToNode::PointsToEdge) { |
2249 | 281 pt_ptset.set(etgt); |
244
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282 edges_processed++; |
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283 } else if (et == PointsToNode::DeferredEdge) { |
2249 | 284 pt_worklist.push(etgt); |
244
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285 edges_processed++; |
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286 } else { |
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287 assert(false,"neither PointsToEdge or DeferredEdge"); |
0 | 288 } |
244
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289 } |
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290 if (edges_processed == 0) { |
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291 // no deferred or pointsto edges found. Assume the value was set |
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292 // outside this method. Add the phantom object to the pointsto set. |
2249 | 293 pt_ptset.set(_phantom_object); |
0 | 294 } |
295 } | |
2249 | 296 return &pt_ptset; |
0 | 297 } |
298 | |
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299 void ConnectionGraph::remove_deferred(uint ni, GrowableArray<uint>* deferred_edges, VectorSet* visited) { |
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300 // This method is most expensive during ConnectionGraph construction. |
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301 // Reuse vectorSet and an additional growable array for deferred edges. |
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302 deferred_edges->clear(); |
2249 | 303 visited->Reset(); |
0 | 304 |
244
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305 visited->set(ni); |
0 | 306 PointsToNode *ptn = ptnode_adr(ni); |
307 | |
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308 // Mark current edges as visited and move deferred edges to separate array. |
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309 for (uint i = 0; i < ptn->edge_count(); ) { |
65 | 310 uint t = ptn->edge_target(i); |
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311 #ifdef ASSERT |
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312 assert(!visited->test_set(t), "expecting no duplications"); |
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313 #else |
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314 visited->set(t); |
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315 #endif |
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316 if (ptn->edge_type(i) == PointsToNode::DeferredEdge) { |
0 | 317 ptn->remove_edge(t, PointsToNode::DeferredEdge); |
101
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318 deferred_edges->append(t); |
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319 } else { |
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320 i++; |
101
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321 } |
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322 } |
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323 for (int next = 0; next < deferred_edges->length(); ++next) { |
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324 uint t = deferred_edges->at(next); |
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325 PointsToNode *ptt = ptnode_adr(t); |
244
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326 uint e_cnt = ptt->edge_count(); |
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327 for (uint e = 0; e < e_cnt; e++) { |
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328 uint etgt = ptt->edge_target(e); |
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329 if (visited->test_set(etgt)) |
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330 continue; |
244
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331 |
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332 PointsToNode::EdgeType et = ptt->edge_type(e); |
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333 if (et == PointsToNode::PointsToEdge) { |
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334 add_pointsto_edge(ni, etgt); |
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335 if(etgt == _phantom_object) { |
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336 // Special case - field set outside (globally escaping). |
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337 ptn->set_escape_state(PointsToNode::GlobalEscape); |
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338 } |
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339 } else if (et == PointsToNode::DeferredEdge) { |
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340 deferred_edges->append(etgt); |
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341 } else { |
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342 assert(false,"invalid connection graph"); |
0 | 343 } |
344 } | |
345 } | |
346 } | |
347 | |
348 | |
349 // Add an edge to node given by "to_i" from any field of adr_i whose offset | |
350 // matches "offset" A deferred edge is added if to_i is a LocalVar, and | |
351 // a pointsto edge is added if it is a JavaObject | |
352 | |
353 void ConnectionGraph::add_edge_from_fields(uint adr_i, uint to_i, int offs) { | |
244
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354 PointsToNode* an = ptnode_adr(adr_i); |
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355 PointsToNode* to = ptnode_adr(to_i); |
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356 bool deferred = (to->node_type() == PointsToNode::LocalVar); |
0 | 357 |
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358 for (uint fe = 0; fe < an->edge_count(); fe++) { |
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359 assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); |
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360 int fi = an->edge_target(fe); |
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361 PointsToNode* pf = ptnode_adr(fi); |
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362 int po = pf->offset(); |
0 | 363 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) { |
364 if (deferred) | |
365 add_deferred_edge(fi, to_i); | |
366 else | |
367 add_pointsto_edge(fi, to_i); | |
368 } | |
369 } | |
370 } | |
371 | |
65 | 372 // Add a deferred edge from node given by "from_i" to any field of adr_i |
373 // whose offset matches "offset". | |
0 | 374 void ConnectionGraph::add_deferred_edge_to_fields(uint from_i, uint adr_i, int offs) { |
244
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375 PointsToNode* an = ptnode_adr(adr_i); |
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376 for (uint fe = 0; fe < an->edge_count(); fe++) { |
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377 assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); |
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378 int fi = an->edge_target(fe); |
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379 PointsToNode* pf = ptnode_adr(fi); |
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380 int po = pf->offset(); |
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381 if (pf->edge_count() == 0) { |
0 | 382 // we have not seen any stores to this field, assume it was set outside this method |
383 add_pointsto_edge(fi, _phantom_object); | |
384 } | |
385 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) { | |
386 add_deferred_edge(from_i, fi); | |
387 } | |
388 } | |
389 } | |
390 | |
65 | 391 // Helper functions |
392 | |
393 static Node* get_addp_base(Node *addp) { | |
394 assert(addp->is_AddP(), "must be AddP"); | |
395 // | |
396 // AddP cases for Base and Address inputs: | |
397 // case #1. Direct object's field reference: | |
398 // Allocate | |
399 // | | |
400 // Proj #5 ( oop result ) | |
401 // | | |
402 // CheckCastPP (cast to instance type) | |
403 // | | | |
404 // AddP ( base == address ) | |
405 // | |
406 // case #2. Indirect object's field reference: | |
407 // Phi | |
408 // | | |
409 // CastPP (cast to instance type) | |
410 // | | | |
411 // AddP ( base == address ) | |
412 // | |
413 // case #3. Raw object's field reference for Initialize node: | |
414 // Allocate | |
415 // | | |
416 // Proj #5 ( oop result ) | |
417 // top | | |
418 // \ | | |
419 // AddP ( base == top ) | |
420 // | |
421 // case #4. Array's element reference: | |
422 // {CheckCastPP | CastPP} | |
423 // | | | | |
424 // | AddP ( array's element offset ) | |
425 // | | | |
426 // AddP ( array's offset ) | |
427 // | |
428 // case #5. Raw object's field reference for arraycopy stub call: | |
429 // The inline_native_clone() case when the arraycopy stub is called | |
430 // after the allocation before Initialize and CheckCastPP nodes. | |
431 // Allocate | |
432 // | | |
433 // Proj #5 ( oop result ) | |
434 // | | | |
435 // AddP ( base == address ) | |
436 // | |
77 | 437 // case #6. Constant Pool, ThreadLocal, CastX2P or |
438 // Raw object's field reference: | |
439 // {ConP, ThreadLocal, CastX2P, raw Load} | |
65 | 440 // top | |
441 // \ | | |
442 // AddP ( base == top ) | |
443 // | |
77 | 444 // case #7. Klass's field reference. |
445 // LoadKlass | |
446 // | | | |
447 // AddP ( base == address ) | |
448 // | |
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449 // case #8. narrow Klass's field reference. |
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450 // LoadNKlass |
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451 // | |
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452 // DecodeN |
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453 // | | |
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454 // AddP ( base == address ) |
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455 // |
65 | 456 Node *base = addp->in(AddPNode::Base)->uncast(); |
457 if (base->is_top()) { // The AddP case #3 and #6. | |
458 base = addp->in(AddPNode::Address)->uncast(); | |
957 | 459 while (base->is_AddP()) { |
460 // Case #6 (unsafe access) may have several chained AddP nodes. | |
461 assert(base->in(AddPNode::Base)->is_top(), "expected unsafe access address only"); | |
462 base = base->in(AddPNode::Address)->uncast(); | |
463 } | |
65 | 464 assert(base->Opcode() == Op_ConP || base->Opcode() == Op_ThreadLocal || |
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465 base->Opcode() == Op_CastX2P || base->is_DecodeN() || |
77 | 466 (base->is_Mem() && base->bottom_type() == TypeRawPtr::NOTNULL) || |
467 (base->is_Proj() && base->in(0)->is_Allocate()), "sanity"); | |
0 | 468 } |
65 | 469 return base; |
470 } | |
471 | |
472 static Node* find_second_addp(Node* addp, Node* n) { | |
473 assert(addp->is_AddP() && addp->outcnt() > 0, "Don't process dead nodes"); | |
474 | |
475 Node* addp2 = addp->raw_out(0); | |
476 if (addp->outcnt() == 1 && addp2->is_AddP() && | |
477 addp2->in(AddPNode::Base) == n && | |
478 addp2->in(AddPNode::Address) == addp) { | |
479 | |
480 assert(addp->in(AddPNode::Base) == n, "expecting the same base"); | |
481 // | |
482 // Find array's offset to push it on worklist first and | |
483 // as result process an array's element offset first (pushed second) | |
484 // to avoid CastPP for the array's offset. | |
485 // Otherwise the inserted CastPP (LocalVar) will point to what | |
486 // the AddP (Field) points to. Which would be wrong since | |
487 // the algorithm expects the CastPP has the same point as | |
488 // as AddP's base CheckCastPP (LocalVar). | |
489 // | |
490 // ArrayAllocation | |
491 // | | |
492 // CheckCastPP | |
493 // | | |
494 // memProj (from ArrayAllocation CheckCastPP) | |
495 // | || | |
496 // | || Int (element index) | |
497 // | || | ConI (log(element size)) | |
498 // | || | / | |
499 // | || LShift | |
500 // | || / | |
501 // | AddP (array's element offset) | |
502 // | | | |
503 // | | ConI (array's offset: #12(32-bits) or #24(64-bits)) | |
504 // | / / | |
505 // AddP (array's offset) | |
506 // | | |
507 // Load/Store (memory operation on array's element) | |
508 // | |
509 return addp2; | |
510 } | |
511 return NULL; | |
0 | 512 } |
513 | |
514 // | |
515 // Adjust the type and inputs of an AddP which computes the | |
516 // address of a field of an instance | |
517 // | |
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518 bool ConnectionGraph::split_AddP(Node *addp, Node *base, PhaseGVN *igvn) { |
65 | 519 const TypeOopPtr *base_t = igvn->type(base)->isa_oopptr(); |
223 | 520 assert(base_t != NULL && base_t->is_known_instance(), "expecting instance oopptr"); |
0 | 521 const TypeOopPtr *t = igvn->type(addp)->isa_oopptr(); |
65 | 522 if (t == NULL) { |
523 // We are computing a raw address for a store captured by an Initialize | |
293
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524 // compute an appropriate address type (cases #3 and #5). |
65 | 525 assert(igvn->type(addp) == TypeRawPtr::NOTNULL, "must be raw pointer"); |
526 assert(addp->in(AddPNode::Address)->is_Proj(), "base of raw address must be result projection from allocation"); | |
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527 intptr_t offs = (int)igvn->find_intptr_t_con(addp->in(AddPNode::Offset), Type::OffsetBot); |
65 | 528 assert(offs != Type::OffsetBot, "offset must be a constant"); |
529 t = base_t->add_offset(offs)->is_oopptr(); | |
530 } | |
223 | 531 int inst_id = base_t->instance_id(); |
532 assert(!t->is_known_instance() || t->instance_id() == inst_id, | |
0 | 533 "old type must be non-instance or match new type"); |
293
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534 |
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535 // The type 't' could be subclass of 'base_t'. |
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536 // As result t->offset() could be large then base_t's size and it will |
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537 // cause the failure in add_offset() with narrow oops since TypeOopPtr() |
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538 // constructor verifies correctness of the offset. |
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539 // |
605 | 540 // It could happened on subclass's branch (from the type profiling |
293
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541 // inlining) which was not eliminated during parsing since the exactness |
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542 // of the allocation type was not propagated to the subclass type check. |
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543 // |
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544 // Or the type 't' could be not related to 'base_t' at all. |
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545 // It could happened when CHA type is different from MDO type on a dead path |
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546 // (for example, from instanceof check) which is not collapsed during parsing. |
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547 // |
293
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548 // Do nothing for such AddP node and don't process its users since |
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549 // this code branch will go away. |
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550 // |
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551 if (!t->is_known_instance() && |
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552 !base_t->klass()->is_subtype_of(t->klass())) { |
293
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553 return false; // bail out |
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554 } |
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555 |
0 | 556 const TypeOopPtr *tinst = base_t->add_offset(t->offset())->is_oopptr(); |
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557 // Do NOT remove the next line: ensure a new alias index is allocated |
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558 // for the instance type. Note: C++ will not remove it since the call |
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559 // has side effect. |
0 | 560 int alias_idx = _compile->get_alias_index(tinst); |
561 igvn->set_type(addp, tinst); | |
562 // record the allocation in the node map | |
1101
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563 assert(ptnode_adr(addp->_idx)->_node != NULL, "should be registered"); |
0 | 564 set_map(addp->_idx, get_map(base->_idx)); |
253
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565 |
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566 // Set addp's Base and Address to 'base'. |
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567 Node *abase = addp->in(AddPNode::Base); |
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568 Node *adr = addp->in(AddPNode::Address); |
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569 if (adr->is_Proj() && adr->in(0)->is_Allocate() && |
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570 adr->in(0)->_idx == (uint)inst_id) { |
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571 // Skip AddP cases #3 and #5. |
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572 } else { |
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573 assert(!abase->is_top(), "sanity"); // AddP case #3 |
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574 if (abase != base) { |
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575 igvn->hash_delete(addp); |
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576 addp->set_req(AddPNode::Base, base); |
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577 if (abase == adr) { |
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578 addp->set_req(AddPNode::Address, base); |
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579 } else { |
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580 // AddP case #4 (adr is array's element offset AddP node) |
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581 #ifdef ASSERT |
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582 const TypeOopPtr *atype = igvn->type(adr)->isa_oopptr(); |
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583 assert(adr->is_AddP() && atype != NULL && |
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584 atype->instance_id() == inst_id, "array's element offset should be processed first"); |
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585 #endif |
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586 } |
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587 igvn->hash_insert(addp); |
0 | 588 } |
589 } | |
65 | 590 // Put on IGVN worklist since at least addp's type was changed above. |
591 record_for_optimizer(addp); | |
293
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592 return true; |
0 | 593 } |
594 | |
595 // | |
596 // Create a new version of orig_phi if necessary. Returns either the newly | |
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597 // created phi or an existing phi. Sets create_new to indicate whether a new |
0 | 598 // phi was created. Cache the last newly created phi in the node map. |
599 // | |
600 PhiNode *ConnectionGraph::create_split_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn, bool &new_created) { | |
601 Compile *C = _compile; | |
602 new_created = false; | |
603 int phi_alias_idx = C->get_alias_index(orig_phi->adr_type()); | |
604 // nothing to do if orig_phi is bottom memory or matches alias_idx | |
65 | 605 if (phi_alias_idx == alias_idx) { |
0 | 606 return orig_phi; |
607 } | |
851
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608 // Have we recently created a Phi for this alias index? |
0 | 609 PhiNode *result = get_map_phi(orig_phi->_idx); |
610 if (result != NULL && C->get_alias_index(result->adr_type()) == alias_idx) { | |
611 return result; | |
612 } | |
851
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613 // Previous check may fail when the same wide memory Phi was split into Phis |
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614 // for different memory slices. Search all Phis for this region. |
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615 if (result != NULL) { |
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616 Node* region = orig_phi->in(0); |
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617 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
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618 Node* phi = region->fast_out(i); |
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619 if (phi->is_Phi() && |
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620 C->get_alias_index(phi->as_Phi()->adr_type()) == alias_idx) { |
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621 assert(phi->_idx >= nodes_size(), "only new Phi per instance memory slice"); |
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622 return phi->as_Phi(); |
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623 } |
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624 } |
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625 } |
38
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626 if ((int)C->unique() + 2*NodeLimitFudgeFactor > MaxNodeLimit) { |
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627 if (C->do_escape_analysis() == true && !C->failing()) { |
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628 // Retry compilation without escape analysis. |
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629 // If this is the first failure, the sentinel string will "stick" |
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630 // to the Compile object, and the C2Compiler will see it and retry. |
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631 C->record_failure(C2Compiler::retry_no_escape_analysis()); |
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632 } |
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633 return NULL; |
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634 } |
0 | 635 orig_phi_worklist.append_if_missing(orig_phi); |
65 | 636 const TypePtr *atype = C->get_adr_type(alias_idx); |
0 | 637 result = PhiNode::make(orig_phi->in(0), NULL, Type::MEMORY, atype); |
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638 C->copy_node_notes_to(result, orig_phi); |
0 | 639 igvn->set_type(result, result->bottom_type()); |
640 record_for_optimizer(result); | |
1101
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641 |
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642 debug_only(Node* pn = ptnode_adr(orig_phi->_idx)->_node;) |
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643 assert(pn == NULL || pn == orig_phi, "wrong node"); |
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644 set_map(orig_phi->_idx, result); |
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645 ptnode_adr(orig_phi->_idx)->_node = orig_phi; |
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646 |
0 | 647 new_created = true; |
648 return result; | |
649 } | |
650 | |
651 // | |
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652 // Return a new version of Memory Phi "orig_phi" with the inputs having the |
0 | 653 // specified alias index. |
654 // | |
655 PhiNode *ConnectionGraph::split_memory_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn) { | |
656 | |
657 assert(alias_idx != Compile::AliasIdxBot, "can't split out bottom memory"); | |
658 Compile *C = _compile; | |
659 bool new_phi_created; | |
65 | 660 PhiNode *result = create_split_phi(orig_phi, alias_idx, orig_phi_worklist, igvn, new_phi_created); |
0 | 661 if (!new_phi_created) { |
662 return result; | |
663 } | |
664 | |
665 GrowableArray<PhiNode *> phi_list; | |
666 GrowableArray<uint> cur_input; | |
667 | |
668 PhiNode *phi = orig_phi; | |
669 uint idx = 1; | |
670 bool finished = false; | |
671 while(!finished) { | |
672 while (idx < phi->req()) { | |
65 | 673 Node *mem = find_inst_mem(phi->in(idx), alias_idx, orig_phi_worklist, igvn); |
0 | 674 if (mem != NULL && mem->is_Phi()) { |
65 | 675 PhiNode *newphi = create_split_phi(mem->as_Phi(), alias_idx, orig_phi_worklist, igvn, new_phi_created); |
0 | 676 if (new_phi_created) { |
677 // found an phi for which we created a new split, push current one on worklist and begin | |
678 // processing new one | |
679 phi_list.push(phi); | |
680 cur_input.push(idx); | |
681 phi = mem->as_Phi(); | |
65 | 682 result = newphi; |
0 | 683 idx = 1; |
684 continue; | |
685 } else { | |
65 | 686 mem = newphi; |
0 | 687 } |
688 } | |
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689 if (C->failing()) { |
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690 return NULL; |
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691 } |
0 | 692 result->set_req(idx++, mem); |
693 } | |
694 #ifdef ASSERT | |
695 // verify that the new Phi has an input for each input of the original | |
696 assert( phi->req() == result->req(), "must have same number of inputs."); | |
697 assert( result->in(0) != NULL && result->in(0) == phi->in(0), "regions must match"); | |
65 | 698 #endif |
699 // Check if all new phi's inputs have specified alias index. | |
700 // Otherwise use old phi. | |
0 | 701 for (uint i = 1; i < phi->req(); i++) { |
65 | 702 Node* in = result->in(i); |
703 assert((phi->in(i) == NULL) == (in == NULL), "inputs must correspond."); | |
0 | 704 } |
705 // we have finished processing a Phi, see if there are any more to do | |
706 finished = (phi_list.length() == 0 ); | |
707 if (!finished) { | |
708 phi = phi_list.pop(); | |
709 idx = cur_input.pop(); | |
65 | 710 PhiNode *prev_result = get_map_phi(phi->_idx); |
711 prev_result->set_req(idx++, result); | |
712 result = prev_result; | |
0 | 713 } |
714 } | |
715 return result; | |
716 } | |
717 | |
65 | 718 |
719 // | |
720 // The next methods are derived from methods in MemNode. | |
721 // | |
1815 | 722 static Node *step_through_mergemem(MergeMemNode *mmem, int alias_idx, const TypeOopPtr *toop) { |
65 | 723 Node *mem = mmem; |
1815 | 724 // TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally |
65 | 725 // means an array I have not precisely typed yet. Do not do any |
726 // alias stuff with it any time soon. | |
1815 | 727 if( toop->base() != Type::AnyPtr && |
728 !(toop->klass() != NULL && | |
729 toop->klass()->is_java_lang_Object() && | |
730 toop->offset() == Type::OffsetBot) ) { | |
65 | 731 mem = mmem->memory_at(alias_idx); |
732 // Update input if it is progress over what we have now | |
733 } | |
734 return mem; | |
735 } | |
736 | |
737 // | |
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738 // Move memory users to their memory slices. |
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739 // |
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740 void ConnectionGraph::move_inst_mem(Node* n, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *igvn) { |
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741 Compile* C = _compile; |
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742 |
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743 const TypePtr* tp = igvn->type(n->in(MemNode::Address))->isa_ptr(); |
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744 assert(tp != NULL, "ptr type"); |
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745 int alias_idx = C->get_alias_index(tp); |
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746 int general_idx = C->get_general_index(alias_idx); |
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747 |
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748 // Move users first |
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749 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
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750 Node* use = n->fast_out(i); |
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751 if (use->is_MergeMem()) { |
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752 MergeMemNode* mmem = use->as_MergeMem(); |
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753 assert(n == mmem->memory_at(alias_idx), "should be on instance memory slice"); |
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|
754 if (n != mmem->memory_at(general_idx) || alias_idx == general_idx) { |
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|
755 continue; // Nothing to do |
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756 } |
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757 // Replace previous general reference to mem node. |
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758 uint orig_uniq = C->unique(); |
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759 Node* m = find_inst_mem(n, general_idx, orig_phis, igvn); |
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760 assert(orig_uniq == C->unique(), "no new nodes"); |
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761 mmem->set_memory_at(general_idx, m); |
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762 --imax; |
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763 --i; |
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764 } else if (use->is_MemBar()) { |
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765 assert(!use->is_Initialize(), "initializing stores should not be moved"); |
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766 if (use->req() > MemBarNode::Precedent && |
7fee0a6cc6d4
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767 use->in(MemBarNode::Precedent) == n) { |
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768 // Don't move related membars. |
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769 record_for_optimizer(use); |
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770 continue; |
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771 } |
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772 tp = use->as_MemBar()->adr_type()->isa_ptr(); |
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773 if (tp != NULL && C->get_alias_index(tp) == alias_idx || |
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774 alias_idx == general_idx) { |
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775 continue; // Nothing to do |
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776 } |
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777 // Move to general memory slice. |
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778 uint orig_uniq = C->unique(); |
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779 Node* m = find_inst_mem(n, general_idx, orig_phis, igvn); |
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780 assert(orig_uniq == C->unique(), "no new nodes"); |
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781 igvn->hash_delete(use); |
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782 imax -= use->replace_edge(n, m); |
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783 igvn->hash_insert(use); |
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|
784 record_for_optimizer(use); |
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785 --i; |
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786 #ifdef ASSERT |
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787 } else if (use->is_Mem()) { |
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788 if (use->Opcode() == Op_StoreCM && use->in(MemNode::OopStore) == n) { |
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789 // Don't move related cardmark. |
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6896727: nsk/logging/LoggingPermission/LoggingPermission/logperm002 fails with G1, EscapeAnalisys
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790 continue; |
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791 } |
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792 // Memory nodes should have new memory input. |
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793 tp = igvn->type(use->in(MemNode::Address))->isa_ptr(); |
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794 assert(tp != NULL, "ptr type"); |
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795 int idx = C->get_alias_index(tp); |
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796 assert(get_map(use->_idx) != NULL || idx == alias_idx, |
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797 "Following memory nodes should have new memory input or be on the same memory slice"); |
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798 } else if (use->is_Phi()) { |
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799 // Phi nodes should be split and moved already. |
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800 tp = use->as_Phi()->adr_type()->isa_ptr(); |
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801 assert(tp != NULL, "ptr type"); |
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802 int idx = C->get_alias_index(tp); |
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803 assert(idx == alias_idx, "Following Phi nodes should be on the same memory slice"); |
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804 } else { |
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805 use->dump(); |
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806 assert(false, "should not be here"); |
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807 #endif |
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808 } |
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809 } |
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810 } |
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811 |
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812 // |
65 | 813 // Search memory chain of "mem" to find a MemNode whose address |
814 // is the specified alias index. | |
815 // | |
816 Node* ConnectionGraph::find_inst_mem(Node *orig_mem, int alias_idx, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *phase) { | |
817 if (orig_mem == NULL) | |
818 return orig_mem; | |
819 Compile* C = phase->C; | |
1815 | 820 const TypeOopPtr *toop = C->get_adr_type(alias_idx)->isa_oopptr(); |
821 bool is_instance = (toop != NULL) && toop->is_known_instance(); | |
253
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822 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
65 | 823 Node *prev = NULL; |
824 Node *result = orig_mem; | |
825 while (prev != result) { | |
826 prev = result; | |
253
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827 if (result == start_mem) |
605 | 828 break; // hit one of our sentinels |
65 | 829 if (result->is_Mem()) { |
253
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kvn
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830 const Type *at = phase->type(result->in(MemNode::Address)); |
2459
55973726c600
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831 if (at == Type::TOP) |
55973726c600
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832 break; // Dead |
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833 assert (at->isa_ptr() != NULL, "pointer type required."); |
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834 int idx = C->get_alias_index(at->is_ptr()); |
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835 if (idx == alias_idx) |
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836 break; // Found |
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837 if (!is_instance && (at->isa_oopptr() == NULL || |
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838 !at->is_oopptr()->is_known_instance())) { |
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839 break; // Do not skip store to general memory slice. |
65 | 840 } |
253
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841 result = result->in(MemNode::Memory); |
65 | 842 } |
843 if (!is_instance) | |
844 continue; // don't search further for non-instance types | |
845 // skip over a call which does not affect this memory slice | |
846 if (result->is_Proj() && result->as_Proj()->_con == TypeFunc::Memory) { | |
847 Node *proj_in = result->in(0); | |
1815 | 848 if (proj_in->is_Allocate() && proj_in->_idx == (uint)toop->instance_id()) { |
605 | 849 break; // hit one of our sentinels |
253
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850 } else if (proj_in->is_Call()) { |
65 | 851 CallNode *call = proj_in->as_Call(); |
1815 | 852 if (!call->may_modify(toop, phase)) { |
65 | 853 result = call->in(TypeFunc::Memory); |
854 } | |
855 } else if (proj_in->is_Initialize()) { | |
856 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); | |
857 // Stop if this is the initialization for the object instance which | |
858 // which contains this memory slice, otherwise skip over it. | |
1815 | 859 if (alloc == NULL || alloc->_idx != (uint)toop->instance_id()) { |
65 | 860 result = proj_in->in(TypeFunc::Memory); |
861 } | |
862 } else if (proj_in->is_MemBar()) { | |
863 result = proj_in->in(TypeFunc::Memory); | |
864 } | |
865 } else if (result->is_MergeMem()) { | |
866 MergeMemNode *mmem = result->as_MergeMem(); | |
1815 | 867 result = step_through_mergemem(mmem, alias_idx, toop); |
65 | 868 if (result == mmem->base_memory()) { |
869 // Didn't find instance memory, search through general slice recursively. | |
870 result = mmem->memory_at(C->get_general_index(alias_idx)); | |
871 result = find_inst_mem(result, alias_idx, orig_phis, phase); | |
872 if (C->failing()) { | |
873 return NULL; | |
874 } | |
875 mmem->set_memory_at(alias_idx, result); | |
876 } | |
877 } else if (result->is_Phi() && | |
878 C->get_alias_index(result->as_Phi()->adr_type()) != alias_idx) { | |
879 Node *un = result->as_Phi()->unique_input(phase); | |
880 if (un != NULL) { | |
1101
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881 orig_phis.append_if_missing(result->as_Phi()); |
65 | 882 result = un; |
883 } else { | |
884 break; | |
885 } | |
1100
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886 } else if (result->is_ClearArray()) { |
1815 | 887 if (!ClearArrayNode::step_through(&result, (uint)toop->instance_id(), phase)) { |
1100
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888 // Can not bypass initialization of the instance |
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889 // we are looking for. |
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890 break; |
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|
891 } |
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892 // Otherwise skip it (the call updated 'result' value). |
584 | 893 } else if (result->Opcode() == Op_SCMemProj) { |
894 assert(result->in(0)->is_LoadStore(), "sanity"); | |
895 const Type *at = phase->type(result->in(0)->in(MemNode::Address)); | |
896 if (at != Type::TOP) { | |
897 assert (at->isa_ptr() != NULL, "pointer type required."); | |
898 int idx = C->get_alias_index(at->is_ptr()); | |
899 assert(idx != alias_idx, "Object is not scalar replaceable if a LoadStore node access its field"); | |
900 break; | |
901 } | |
902 result = result->in(0)->in(MemNode::Memory); | |
65 | 903 } |
904 } | |
247 | 905 if (result->is_Phi()) { |
65 | 906 PhiNode *mphi = result->as_Phi(); |
907 assert(mphi->bottom_type() == Type::MEMORY, "memory phi required"); | |
908 const TypePtr *t = mphi->adr_type(); | |
2459
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909 if (!is_instance) { |
247 | 910 // Push all non-instance Phis on the orig_phis worklist to update inputs |
911 // during Phase 4 if needed. | |
912 orig_phis.append_if_missing(mphi); | |
2459
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913 } else if (C->get_alias_index(t) != alias_idx) { |
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914 // Create a new Phi with the specified alias index type. |
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915 result = split_memory_phi(mphi, alias_idx, orig_phis, phase); |
65 | 916 } |
917 } | |
918 // the result is either MemNode, PhiNode, InitializeNode. | |
919 return result; | |
920 } | |
921 | |
0 | 922 // |
923 // Convert the types of unescaped object to instance types where possible, | |
924 // propagate the new type information through the graph, and update memory | |
925 // edges and MergeMem inputs to reflect the new type. | |
926 // | |
927 // We start with allocations (and calls which may be allocations) on alloc_worklist. | |
928 // The processing is done in 4 phases: | |
929 // | |
930 // Phase 1: Process possible allocations from alloc_worklist. Create instance | |
931 // types for the CheckCastPP for allocations where possible. | |
932 // Propagate the the new types through users as follows: | |
933 // casts and Phi: push users on alloc_worklist | |
934 // AddP: cast Base and Address inputs to the instance type | |
935 // push any AddP users on alloc_worklist and push any memnode | |
936 // users onto memnode_worklist. | |
937 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and | |
938 // search the Memory chain for a store with the appropriate type | |
939 // address type. If a Phi is found, create a new version with | |
605 | 940 // the appropriate memory slices from each of the Phi inputs. |
0 | 941 // For stores, process the users as follows: |
942 // MemNode: push on memnode_worklist | |
943 // MergeMem: push on mergemem_worklist | |
944 // Phase 3: Process MergeMem nodes from mergemem_worklist. Walk each memory slice | |
945 // moving the first node encountered of each instance type to the | |
946 // the input corresponding to its alias index. | |
947 // appropriate memory slice. | |
948 // Phase 4: Update the inputs of non-instance memory Phis and the Memory input of memnodes. | |
949 // | |
950 // In the following example, the CheckCastPP nodes are the cast of allocation | |
951 // results and the allocation of node 29 is unescaped and eligible to be an | |
952 // instance type. | |
953 // | |
954 // We start with: | |
955 // | |
956 // 7 Parm #memory | |
957 // 10 ConI "12" | |
958 // 19 CheckCastPP "Foo" | |
959 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
960 // 29 CheckCastPP "Foo" | |
961 // 30 AddP _ 29 29 10 Foo+12 alias_index=4 | |
962 // | |
963 // 40 StoreP 25 7 20 ... alias_index=4 | |
964 // 50 StoreP 35 40 30 ... alias_index=4 | |
965 // 60 StoreP 45 50 20 ... alias_index=4 | |
966 // 70 LoadP _ 60 30 ... alias_index=4 | |
967 // 80 Phi 75 50 60 Memory alias_index=4 | |
968 // 90 LoadP _ 80 30 ... alias_index=4 | |
969 // 100 LoadP _ 80 20 ... alias_index=4 | |
970 // | |
971 // | |
972 // Phase 1 creates an instance type for node 29 assigning it an instance id of 24 | |
973 // and creating a new alias index for node 30. This gives: | |
974 // | |
975 // 7 Parm #memory | |
976 // 10 ConI "12" | |
977 // 19 CheckCastPP "Foo" | |
978 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
979 // 29 CheckCastPP "Foo" iid=24 | |
980 // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24 | |
981 // | |
982 // 40 StoreP 25 7 20 ... alias_index=4 | |
983 // 50 StoreP 35 40 30 ... alias_index=6 | |
984 // 60 StoreP 45 50 20 ... alias_index=4 | |
985 // 70 LoadP _ 60 30 ... alias_index=6 | |
986 // 80 Phi 75 50 60 Memory alias_index=4 | |
987 // 90 LoadP _ 80 30 ... alias_index=6 | |
988 // 100 LoadP _ 80 20 ... alias_index=4 | |
989 // | |
990 // In phase 2, new memory inputs are computed for the loads and stores, | |
991 // And a new version of the phi is created. In phase 4, the inputs to | |
992 // node 80 are updated and then the memory nodes are updated with the | |
993 // values computed in phase 2. This results in: | |
994 // | |
995 // 7 Parm #memory | |
996 // 10 ConI "12" | |
997 // 19 CheckCastPP "Foo" | |
998 // 20 AddP _ 19 19 10 Foo+12 alias_index=4 | |
999 // 29 CheckCastPP "Foo" iid=24 | |
1000 // 30 AddP _ 29 29 10 Foo+12 alias_index=6 iid=24 | |
1001 // | |
1002 // 40 StoreP 25 7 20 ... alias_index=4 | |
1003 // 50 StoreP 35 7 30 ... alias_index=6 | |
1004 // 60 StoreP 45 40 20 ... alias_index=4 | |
1005 // 70 LoadP _ 50 30 ... alias_index=6 | |
1006 // 80 Phi 75 40 60 Memory alias_index=4 | |
1007 // 120 Phi 75 50 50 Memory alias_index=6 | |
1008 // 90 LoadP _ 120 30 ... alias_index=6 | |
1009 // 100 LoadP _ 80 20 ... alias_index=4 | |
1010 // | |
1011 void ConnectionGraph::split_unique_types(GrowableArray<Node *> &alloc_worklist) { | |
1012 GrowableArray<Node *> memnode_worklist; | |
1013 GrowableArray<PhiNode *> orig_phis; | |
1101
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1014 |
1921 | 1015 PhaseIterGVN *igvn = _igvn; |
0 | 1016 uint new_index_start = (uint) _compile->num_alias_types(); |
1101
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1017 Arena* arena = Thread::current()->resource_area(); |
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1018 VectorSet visited(arena); |
0 | 1019 |
65 | 1020 |
1021 // Phase 1: Process possible allocations from alloc_worklist. | |
1022 // Create instance types for the CheckCastPP for allocations where possible. | |
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1023 // |
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1024 // (Note: don't forget to change the order of the second AddP node on |
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1025 // the alloc_worklist if the order of the worklist processing is changed, |
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1026 // see the comment in find_second_addp().) |
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1027 // |
0 | 1028 while (alloc_worklist.length() != 0) { |
1029 Node *n = alloc_worklist.pop(); | |
1030 uint ni = n->_idx; | |
65 | 1031 const TypeOopPtr* tinst = NULL; |
0 | 1032 if (n->is_Call()) { |
1033 CallNode *alloc = n->as_Call(); | |
1034 // copy escape information to call node | |
244
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1035 PointsToNode* ptn = ptnode_adr(alloc->_idx); |
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1036 PointsToNode::EscapeState es = escape_state(alloc); |
65 | 1037 // We have an allocation or call which returns a Java object, |
1038 // see if it is unescaped. | |
1039 if (es != PointsToNode::NoEscape || !ptn->_scalar_replaceable) | |
0 | 1040 continue; |
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1041 |
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1042 // Find CheckCastPP for the allocate or for the return value of a call |
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1043 n = alloc->result_cast(); |
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1044 if (n == NULL) { // No uses except Initialize node |
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1045 if (alloc->is_Allocate()) { |
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1046 // Set the scalar_replaceable flag for allocation |
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1047 // so it could be eliminated if it has no uses. |
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1048 alloc->as_Allocate()->_is_scalar_replaceable = true; |
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1049 } |
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1050 continue; |
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1051 } |
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1052 if (!n->is_CheckCastPP()) { // not unique CheckCastPP. |
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1053 assert(!alloc->is_Allocate(), "allocation should have unique type"); |
65 | 1054 continue; |
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1055 } |
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1056 |
65 | 1057 // The inline code for Object.clone() casts the allocation result to |
247 | 1058 // java.lang.Object and then to the actual type of the allocated |
65 | 1059 // object. Detect this case and use the second cast. |
247 | 1060 // Also detect j.l.reflect.Array.newInstance(jobject, jint) case when |
1061 // the allocation result is cast to java.lang.Object and then | |
1062 // to the actual Array type. | |
65 | 1063 if (alloc->is_Allocate() && n->as_Type()->type() == TypeInstPtr::NOTNULL |
247 | 1064 && (alloc->is_AllocateArray() || |
1065 igvn->type(alloc->in(AllocateNode::KlassNode)) != TypeKlassPtr::OBJECT)) { | |
65 | 1066 Node *cast2 = NULL; |
1067 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1068 Node *use = n->fast_out(i); | |
1069 if (use->is_CheckCastPP()) { | |
1070 cast2 = use; | |
1071 break; | |
1072 } | |
1073 } | |
1074 if (cast2 != NULL) { | |
1075 n = cast2; | |
1076 } else { | |
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1077 // Non-scalar replaceable if the allocation type is unknown statically |
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1078 // (reflection allocation), the object can't be restored during |
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1079 // deoptimization without precise type. |
65 | 1080 continue; |
1081 } | |
1082 } | |
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1083 if (alloc->is_Allocate()) { |
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1084 // Set the scalar_replaceable flag for allocation |
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1085 // so it could be eliminated. |
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1086 alloc->as_Allocate()->_is_scalar_replaceable = true; |
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1087 } |
65 | 1088 set_escape_state(n->_idx, es); |
247 | 1089 // in order for an object to be scalar-replaceable, it must be: |
65 | 1090 // - a direct allocation (not a call returning an object) |
1091 // - non-escaping | |
1092 // - eligible to be a unique type | |
1093 // - not determined to be ineligible by escape analysis | |
1101
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1094 assert(ptnode_adr(alloc->_idx)->_node != NULL && |
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1095 ptnode_adr(n->_idx)->_node != NULL, "should be registered"); |
0 | 1096 set_map(alloc->_idx, n); |
1097 set_map(n->_idx, alloc); | |
65 | 1098 const TypeOopPtr *t = igvn->type(n)->isa_oopptr(); |
1099 if (t == NULL) | |
0 | 1100 continue; // not a TypeInstPtr |
247 | 1101 tinst = t->cast_to_exactness(true)->is_oopptr()->cast_to_instance_id(ni); |
0 | 1102 igvn->hash_delete(n); |
1103 igvn->set_type(n, tinst); | |
1104 n->raise_bottom_type(tinst); | |
1105 igvn->hash_insert(n); | |
65 | 1106 record_for_optimizer(n); |
1107 if (alloc->is_Allocate() && ptn->_scalar_replaceable && | |
1108 (t->isa_instptr() || t->isa_aryptr())) { | |
163 | 1109 |
1110 // First, put on the worklist all Field edges from Connection Graph | |
1111 // which is more accurate then putting immediate users from Ideal Graph. | |
1112 for (uint e = 0; e < ptn->edge_count(); e++) { | |
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1113 Node *use = ptnode_adr(ptn->edge_target(e))->_node; |
163 | 1114 assert(ptn->edge_type(e) == PointsToNode::FieldEdge && use->is_AddP(), |
1115 "only AddP nodes are Field edges in CG"); | |
1116 if (use->outcnt() > 0) { // Don't process dead nodes | |
1117 Node* addp2 = find_second_addp(use, use->in(AddPNode::Base)); | |
1118 if (addp2 != NULL) { | |
1119 assert(alloc->is_AllocateArray(),"array allocation was expected"); | |
1120 alloc_worklist.append_if_missing(addp2); | |
1121 } | |
1122 alloc_worklist.append_if_missing(use); | |
1123 } | |
1124 } | |
1125 | |
65 | 1126 // An allocation may have an Initialize which has raw stores. Scan |
1127 // the users of the raw allocation result and push AddP users | |
1128 // on alloc_worklist. | |
1129 Node *raw_result = alloc->proj_out(TypeFunc::Parms); | |
1130 assert (raw_result != NULL, "must have an allocation result"); | |
1131 for (DUIterator_Fast imax, i = raw_result->fast_outs(imax); i < imax; i++) { | |
1132 Node *use = raw_result->fast_out(i); | |
1133 if (use->is_AddP() && use->outcnt() > 0) { // Don't process dead nodes | |
1134 Node* addp2 = find_second_addp(use, raw_result); | |
1135 if (addp2 != NULL) { | |
1136 assert(alloc->is_AllocateArray(),"array allocation was expected"); | |
1137 alloc_worklist.append_if_missing(addp2); | |
1138 } | |
1139 alloc_worklist.append_if_missing(use); | |
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1140 } else if (use->is_MemBar()) { |
65 | 1141 memnode_worklist.append_if_missing(use); |
1142 } | |
1143 } | |
1144 } | |
0 | 1145 } else if (n->is_AddP()) { |
2249 | 1146 VectorSet* ptset = PointsTo(get_addp_base(n)); |
1147 assert(ptset->Size() == 1, "AddP address is unique"); | |
1148 uint elem = ptset->getelem(); // Allocation node's index | |
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1149 if (elem == _phantom_object) { |
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1150 assert(false, "escaped allocation"); |
65 | 1151 continue; // Assume the value was set outside this method. |
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1152 } |
65 | 1153 Node *base = get_map(elem); // CheckCastPP node |
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1154 if (!split_AddP(n, base, igvn)) continue; // wrong type from dead path |
65 | 1155 tinst = igvn->type(base)->isa_oopptr(); |
1156 } else if (n->is_Phi() || | |
1157 n->is_CheckCastPP() || | |
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1158 n->is_EncodeP() || |
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1159 n->is_DecodeN() || |
65 | 1160 (n->is_ConstraintCast() && n->Opcode() == Op_CastPP)) { |
0 | 1161 if (visited.test_set(n->_idx)) { |
1162 assert(n->is_Phi(), "loops only through Phi's"); | |
1163 continue; // already processed | |
1164 } | |
2249 | 1165 VectorSet* ptset = PointsTo(n); |
1166 if (ptset->Size() == 1) { | |
1167 uint elem = ptset->getelem(); // Allocation node's index | |
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1168 if (elem == _phantom_object) { |
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1169 assert(false, "escaped allocation"); |
65 | 1170 continue; // Assume the value was set outside this method. |
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1171 } |
65 | 1172 Node *val = get_map(elem); // CheckCastPP node |
0 | 1173 TypeNode *tn = n->as_Type(); |
65 | 1174 tinst = igvn->type(val)->isa_oopptr(); |
223 | 1175 assert(tinst != NULL && tinst->is_known_instance() && |
1176 (uint)tinst->instance_id() == elem , "instance type expected."); | |
163 | 1177 |
1178 const Type *tn_type = igvn->type(tn); | |
223 | 1179 const TypeOopPtr *tn_t; |
1180 if (tn_type->isa_narrowoop()) { | |
1181 tn_t = tn_type->make_ptr()->isa_oopptr(); | |
1182 } else { | |
1183 tn_t = tn_type->isa_oopptr(); | |
1184 } | |
0 | 1185 |
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1186 if (tn_t != NULL && tinst->klass()->is_subtype_of(tn_t->klass())) { |
163 | 1187 if (tn_type->isa_narrowoop()) { |
1188 tn_type = tinst->make_narrowoop(); | |
1189 } else { | |
1190 tn_type = tinst; | |
1191 } | |
0 | 1192 igvn->hash_delete(tn); |
163 | 1193 igvn->set_type(tn, tn_type); |
1194 tn->set_type(tn_type); | |
0 | 1195 igvn->hash_insert(tn); |
65 | 1196 record_for_optimizer(n); |
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1197 } else { |
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1198 assert(tn_type == TypePtr::NULL_PTR || |
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1199 tn_t != NULL && !tinst->klass()->is_subtype_of(tn_t->klass()), |
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1200 "unexpected type"); |
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1201 continue; // Skip dead path with different type |
0 | 1202 } |
1203 } | |
1204 } else { | |
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1205 debug_only(n->dump();) |
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1206 assert(false, "EA: unexpected node"); |
0 | 1207 continue; |
1208 } | |
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1209 // push allocation's users on appropriate worklist |
0 | 1210 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
1211 Node *use = n->fast_out(i); | |
1212 if(use->is_Mem() && use->in(MemNode::Address) == n) { | |
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1213 // Load/store to instance's field |
65 | 1214 memnode_worklist.append_if_missing(use); |
1100
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1215 } else if (use->is_MemBar()) { |
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1216 memnode_worklist.append_if_missing(use); |
65 | 1217 } else if (use->is_AddP() && use->outcnt() > 0) { // No dead nodes |
1218 Node* addp2 = find_second_addp(use, n); | |
1219 if (addp2 != NULL) { | |
1220 alloc_worklist.append_if_missing(addp2); | |
1221 } | |
1222 alloc_worklist.append_if_missing(use); | |
1223 } else if (use->is_Phi() || | |
1224 use->is_CheckCastPP() || | |
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1225 use->is_EncodeP() || |
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1226 use->is_DecodeN() || |
65 | 1227 (use->is_ConstraintCast() && use->Opcode() == Op_CastPP)) { |
1228 alloc_worklist.append_if_missing(use); | |
1100
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1229 #ifdef ASSERT |
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1230 } else if (use->is_Mem()) { |
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1231 assert(use->in(MemNode::Address) != n, "EA: missing allocation reference path"); |
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1232 } else if (use->is_MergeMem()) { |
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1233 assert(_mergemem_worklist.contains(use->as_MergeMem()), "EA: missing MergeMem node in the worklist"); |
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1234 } else if (use->is_SafePoint()) { |
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1235 // Look for MergeMem nodes for calls which reference unique allocation |
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1236 // (through CheckCastPP nodes) even for debug info. |
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1237 Node* m = use->in(TypeFunc::Memory); |
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1238 if (m->is_MergeMem()) { |
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1239 assert(_mergemem_worklist.contains(m->as_MergeMem()), "EA: missing MergeMem node in the worklist"); |
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1240 } |
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1241 } else { |
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1242 uint op = use->Opcode(); |
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1243 if (!(op == Op_CmpP || op == Op_Conv2B || |
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1244 op == Op_CastP2X || op == Op_StoreCM || |
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1245 op == Op_FastLock || op == Op_AryEq || op == Op_StrComp || |
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1246 op == Op_StrEquals || op == Op_StrIndexOf)) { |
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1247 n->dump(); |
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1248 use->dump(); |
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1249 assert(false, "EA: missing allocation reference path"); |
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1250 } |
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1251 #endif |
0 | 1252 } |
1253 } | |
1254 | |
1255 } | |
65 | 1256 // New alias types were created in split_AddP(). |
0 | 1257 uint new_index_end = (uint) _compile->num_alias_types(); |
1258 | |
1259 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and | |
1260 // compute new values for Memory inputs (the Memory inputs are not | |
1261 // actually updated until phase 4.) | |
1262 if (memnode_worklist.length() == 0) | |
1263 return; // nothing to do | |
1264 | |
1265 while (memnode_worklist.length() != 0) { | |
1266 Node *n = memnode_worklist.pop(); | |
65 | 1267 if (visited.test_set(n->_idx)) |
1268 continue; | |
1100
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1269 if (n->is_Phi() || n->is_ClearArray()) { |
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1270 // we don't need to do anything, but the users must be pushed |
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1271 } else if (n->is_MemBar()) { // Initialize, MemBar nodes |
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1272 // we don't need to do anything, but the users must be pushed |
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1273 n = n->as_MemBar()->proj_out(TypeFunc::Memory); |
65 | 1274 if (n == NULL) |
0 | 1275 continue; |
1276 } else { | |
1277 assert(n->is_Mem(), "memory node required."); | |
1278 Node *addr = n->in(MemNode::Address); | |
1279 const Type *addr_t = igvn->type(addr); | |
1280 if (addr_t == Type::TOP) | |
1281 continue; | |
1282 assert (addr_t->isa_ptr() != NULL, "pointer type required."); | |
1283 int alias_idx = _compile->get_alias_index(addr_t->is_ptr()); | |
65 | 1284 assert ((uint)alias_idx < new_index_end, "wrong alias index"); |
1285 Node *mem = find_inst_mem(n->in(MemNode::Memory), alias_idx, orig_phis, igvn); | |
38
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1286 if (_compile->failing()) { |
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1287 return; |
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1288 } |
65 | 1289 if (mem != n->in(MemNode::Memory)) { |
1101
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1290 // We delay the memory edge update since we need old one in |
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1291 // MergeMem code below when instances memory slices are separated. |
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1292 debug_only(Node* pn = ptnode_adr(n->_idx)->_node;) |
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1293 assert(pn == NULL || pn == n, "wrong node"); |
0 | 1294 set_map(n->_idx, mem); |
244
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1295 ptnode_adr(n->_idx)->_node = n; |
65 | 1296 } |
0 | 1297 if (n->is_Load()) { |
1298 continue; // don't push users | |
1299 } else if (n->is_LoadStore()) { | |
1300 // get the memory projection | |
1301 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1302 Node *use = n->fast_out(i); | |
1303 if (use->Opcode() == Op_SCMemProj) { | |
1304 n = use; | |
1305 break; | |
1306 } | |
1307 } | |
1308 assert(n->Opcode() == Op_SCMemProj, "memory projection required"); | |
1309 } | |
1310 } | |
1311 // push user on appropriate worklist | |
1312 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1313 Node *use = n->fast_out(i); | |
1100
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1314 if (use->is_Phi() || use->is_ClearArray()) { |
65 | 1315 memnode_worklist.append_if_missing(use); |
0 | 1316 } else if(use->is_Mem() && use->in(MemNode::Memory) == n) { |
1100
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1317 if (use->Opcode() == Op_StoreCM) // Ignore cardmark stores |
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1318 continue; |
65 | 1319 memnode_worklist.append_if_missing(use); |
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1320 } else if (use->is_MemBar()) { |
65 | 1321 memnode_worklist.append_if_missing(use); |
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1322 #ifdef ASSERT |
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1323 } else if(use->is_Mem()) { |
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1324 assert(use->in(MemNode::Memory) != n, "EA: missing memory path"); |
0 | 1325 } else if (use->is_MergeMem()) { |
1100
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1326 assert(_mergemem_worklist.contains(use->as_MergeMem()), "EA: missing MergeMem node in the worklist"); |
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1327 } else { |
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1328 uint op = use->Opcode(); |
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1329 if (!(op == Op_StoreCM || |
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1330 (op == Op_CallLeaf && use->as_CallLeaf()->_name != NULL && |
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1331 strcmp(use->as_CallLeaf()->_name, "g1_wb_pre") == 0) || |
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1332 op == Op_AryEq || op == Op_StrComp || |
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1333 op == Op_StrEquals || op == Op_StrIndexOf)) { |
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1334 n->dump(); |
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1335 use->dump(); |
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1336 assert(false, "EA: missing memory path"); |
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1337 } |
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1338 #endif |
0 | 1339 } |
1340 } | |
1341 } | |
1342 | |
65 | 1343 // Phase 3: Process MergeMem nodes from mergemem_worklist. |
1100
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1344 // Walk each memory slice moving the first node encountered of each |
65 | 1345 // instance type to the the input corresponding to its alias index. |
1100
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1346 uint length = _mergemem_worklist.length(); |
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1347 for( uint next = 0; next < length; ++next ) { |
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1348 MergeMemNode* nmm = _mergemem_worklist.at(next); |
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1349 assert(!visited.test_set(nmm->_idx), "should not be visited before"); |
0 | 1350 // Note: we don't want to use MergeMemStream here because we only want to |
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1351 // scan inputs which exist at the start, not ones we add during processing. |
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1352 // Note 2: MergeMem may already contains instance memory slices added |
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1353 // during find_inst_mem() call when memory nodes were processed above. |
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1354 igvn->hash_delete(nmm); |
0 | 1355 uint nslices = nmm->req(); |
1356 for (uint i = Compile::AliasIdxRaw+1; i < nslices; i++) { | |
65 | 1357 Node* mem = nmm->in(i); |
1358 Node* cur = NULL; | |
0 | 1359 if (mem == NULL || mem->is_top()) |
1360 continue; | |
1101
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1361 // First, update mergemem by moving memory nodes to corresponding slices |
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1362 // if their type became more precise since this mergemem was created. |
0 | 1363 while (mem->is_Mem()) { |
1364 const Type *at = igvn->type(mem->in(MemNode::Address)); | |
1365 if (at != Type::TOP) { | |
1366 assert (at->isa_ptr() != NULL, "pointer type required."); | |
1367 uint idx = (uint)_compile->get_alias_index(at->is_ptr()); | |
1368 if (idx == i) { | |
1369 if (cur == NULL) | |
1370 cur = mem; | |
1371 } else { | |
1372 if (idx >= nmm->req() || nmm->is_empty_memory(nmm->in(idx))) { | |
1373 nmm->set_memory_at(idx, mem); | |
1374 } | |
1375 } | |
1376 } | |
1377 mem = mem->in(MemNode::Memory); | |
1378 } | |
1379 nmm->set_memory_at(i, (cur != NULL) ? cur : mem); | |
65 | 1380 // Find any instance of the current type if we haven't encountered |
1101
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1381 // already a memory slice of the instance along the memory chain. |
65 | 1382 for (uint ni = new_index_start; ni < new_index_end; ni++) { |
1383 if((uint)_compile->get_general_index(ni) == i) { | |
1384 Node *m = (ni >= nmm->req()) ? nmm->empty_memory() : nmm->in(ni); | |
1385 if (nmm->is_empty_memory(m)) { | |
1386 Node* result = find_inst_mem(mem, ni, orig_phis, igvn); | |
1387 if (_compile->failing()) { | |
1388 return; | |
1389 } | |
1390 nmm->set_memory_at(ni, result); | |
1391 } | |
1392 } | |
1393 } | |
1394 } | |
1395 // Find the rest of instances values | |
1396 for (uint ni = new_index_start; ni < new_index_end; ni++) { | |
1101
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1397 const TypeOopPtr *tinst = _compile->get_adr_type(ni)->isa_oopptr(); |
65 | 1398 Node* result = step_through_mergemem(nmm, ni, tinst); |
1399 if (result == nmm->base_memory()) { | |
1400 // Didn't find instance memory, search through general slice recursively. | |
1101
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1401 result = nmm->memory_at(_compile->get_general_index(ni)); |
65 | 1402 result = find_inst_mem(result, ni, orig_phis, igvn); |
1403 if (_compile->failing()) { | |
1404 return; | |
1405 } | |
1406 nmm->set_memory_at(ni, result); | |
1407 } | |
1408 } | |
1409 igvn->hash_insert(nmm); | |
1410 record_for_optimizer(nmm); | |
0 | 1411 } |
1412 | |
65 | 1413 // Phase 4: Update the inputs of non-instance memory Phis and |
1414 // the Memory input of memnodes | |
0 | 1415 // First update the inputs of any non-instance Phi's from |
1416 // which we split out an instance Phi. Note we don't have | |
1417 // to recursively process Phi's encounted on the input memory | |
1418 // chains as is done in split_memory_phi() since they will | |
1419 // also be processed here. | |
247 | 1420 for (int j = 0; j < orig_phis.length(); j++) { |
1421 PhiNode *phi = orig_phis.at(j); | |
0 | 1422 int alias_idx = _compile->get_alias_index(phi->adr_type()); |
1423 igvn->hash_delete(phi); | |
1424 for (uint i = 1; i < phi->req(); i++) { | |
1425 Node *mem = phi->in(i); | |
65 | 1426 Node *new_mem = find_inst_mem(mem, alias_idx, orig_phis, igvn); |
1427 if (_compile->failing()) { | |
1428 return; | |
1429 } | |
0 | 1430 if (mem != new_mem) { |
1431 phi->set_req(i, new_mem); | |
1432 } | |
1433 } | |
1434 igvn->hash_insert(phi); | |
1435 record_for_optimizer(phi); | |
1436 } | |
1437 | |
1438 // Update the memory inputs of MemNodes with the value we computed | |
1101
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1439 // in Phase 2 and move stores memory users to corresponding memory slices. |
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1440 #ifdef ASSERT |
2249 | 1441 visited.Reset(); |
1101
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1442 Node_Stack old_mems(arena, _compile->unique() >> 2); |
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1443 #endif |
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1444 for (uint i = 0; i < nodes_size(); i++) { |
0 | 1445 Node *nmem = get_map(i); |
1446 if (nmem != NULL) { | |
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1447 Node *n = ptnode_adr(i)->_node; |
1101
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1448 assert(n != NULL, "sanity"); |
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1449 if (n->is_Mem()) { |
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1450 #ifdef ASSERT |
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1451 Node* old_mem = n->in(MemNode::Memory); |
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1452 if (!visited.test_set(old_mem->_idx)) { |
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1453 old_mems.push(old_mem, old_mem->outcnt()); |
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1454 } |
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1455 #endif |
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1456 assert(n->in(MemNode::Memory) != nmem, "sanity"); |
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1457 if (!n->is_Load()) { |
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1458 // Move memory users of a store first. |
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1459 move_inst_mem(n, orig_phis, igvn); |
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1460 } |
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1461 // Now update memory input |
0 | 1462 igvn->hash_delete(n); |
1463 n->set_req(MemNode::Memory, nmem); | |
1464 igvn->hash_insert(n); | |
1465 record_for_optimizer(n); | |
1101
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1466 } else { |
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1467 assert(n->is_Allocate() || n->is_CheckCastPP() || |
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1468 n->is_AddP() || n->is_Phi(), "unknown node used for set_map()"); |
0 | 1469 } |
1470 } | |
1471 } | |
1101
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1472 #ifdef ASSERT |
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1473 // Verify that memory was split correctly |
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1474 while (old_mems.is_nonempty()) { |
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1475 Node* old_mem = old_mems.node(); |
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1476 uint old_cnt = old_mems.index(); |
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1477 old_mems.pop(); |
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1478 assert(old_cnt = old_mem->outcnt(), "old mem could be lost"); |
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1479 } |
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1480 #endif |
0 | 1481 } |
1482 | |
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1483 bool ConnectionGraph::has_candidates(Compile *C) { |
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1484 // EA brings benefits only when the code has allocations and/or locks which |
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1485 // are represented by ideal Macro nodes. |
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1486 int cnt = C->macro_count(); |
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1487 for( int i=0; i < cnt; i++ ) { |
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1488 Node *n = C->macro_node(i); |
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1489 if ( n->is_Allocate() ) |
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1490 return true; |
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1491 if( n->is_Lock() ) { |
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1492 Node* obj = n->as_Lock()->obj_node()->uncast(); |
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1493 if( !(obj->is_Parm() || obj->is_Con()) ) |
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1494 return true; |
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1495 } |
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1496 } |
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1497 return false; |
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1498 } |
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1499 |
1634
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1500 void ConnectionGraph::do_analysis(Compile *C, PhaseIterGVN *igvn) { |
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1501 // Add ConP#NULL and ConN#NULL nodes before ConnectionGraph construction |
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1502 // to create space for them in ConnectionGraph::_nodes[]. |
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1503 Node* oop_null = igvn->zerocon(T_OBJECT); |
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1504 Node* noop_null = igvn->zerocon(T_NARROWOOP); |
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1505 |
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1506 ConnectionGraph* congraph = new(C->comp_arena()) ConnectionGraph(C, igvn); |
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1507 // Perform escape analysis |
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1508 if (congraph->compute_escape()) { |
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1509 // There are non escaping objects. |
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1510 C->set_congraph(congraph); |
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1511 } |
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1512 |
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1513 // Cleanup. |
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1514 if (oop_null->outcnt() == 0) |
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1515 igvn->hash_delete(oop_null); |
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1516 if (noop_null->outcnt() == 0) |
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1517 igvn->hash_delete(noop_null); |
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1518 } |
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1519 |
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1520 bool ConnectionGraph::compute_escape() { |
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1521 Compile* C = _compile; |
65 | 1522 |
163 | 1523 // 1. Populate Connection Graph (CG) with Ideal nodes. |
65 | 1524 |
1525 Unique_Node_List worklist_init; | |
244
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1526 worklist_init.map(C->unique(), NULL); // preallocate space |
65 | 1527 |
1528 // Initialize worklist | |
244
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1529 if (C->root() != NULL) { |
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1530 worklist_init.push(C->root()); |
65 | 1531 } |
1532 | |
1533 GrowableArray<int> cg_worklist; | |
1634
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1534 PhaseGVN* igvn = _igvn; |
65 | 1535 bool has_allocations = false; |
1536 | |
1537 // Push all useful nodes onto CG list and set their type. | |
1538 for( uint next = 0; next < worklist_init.size(); ++next ) { | |
1539 Node* n = worklist_init.at(next); | |
1540 record_for_escape_analysis(n, igvn); | |
244
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1541 // Only allocations and java static calls results are checked |
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1542 // for an escape status. See process_call_result() below. |
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1543 if (n->is_Allocate() || n->is_CallStaticJava() && |
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1544 ptnode_adr(n->_idx)->node_type() == PointsToNode::JavaObject) { |
65 | 1545 has_allocations = true; |
1546 } | |
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1547 if(n->is_AddP()) { |
1921 | 1548 // Collect address nodes. Use them during stage 3 below |
1549 // to build initial connection graph field edges. | |
1550 cg_worklist.append(n->_idx); | |
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1551 } else if (n->is_MergeMem()) { |
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1552 // Collect all MergeMem nodes to add memory slices for |
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1553 // scalar replaceable objects in split_unique_types(). |
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1554 _mergemem_worklist.append(n->as_MergeMem()); |
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1555 } |
65 | 1556 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
1557 Node* m = n->fast_out(i); // Get user | |
1558 worklist_init.push(m); | |
1559 } | |
1560 } | |
0 | 1561 |
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1562 if (!has_allocations) { |
65 | 1563 _collecting = false; |
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1564 return false; // Nothing to do. |
65 | 1565 } |
1566 | |
1567 // 2. First pass to create simple CG edges (doesn't require to walk CG). | |
244
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1568 uint delayed_size = _delayed_worklist.size(); |
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1569 for( uint next = 0; next < delayed_size; ++next ) { |
65 | 1570 Node* n = _delayed_worklist.at(next); |
1571 build_connection_graph(n, igvn); | |
1572 } | |
0 | 1573 |
1921 | 1574 // 3. Pass to create initial fields edges (JavaObject -F-> AddP) |
1575 // to reduce number of iterations during stage 4 below. | |
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1576 uint cg_length = cg_worklist.length(); |
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1577 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1578 int ni = cg_worklist.at(next); |
1921 | 1579 Node* n = ptnode_adr(ni)->_node; |
1580 Node* base = get_addp_base(n); | |
1581 if (base->is_Proj()) | |
1582 base = base->in(0); | |
1583 PointsToNode::NodeType nt = ptnode_adr(base->_idx)->node_type(); | |
1584 if (nt == PointsToNode::JavaObject) { | |
1585 build_connection_graph(n, igvn); | |
1586 } | |
65 | 1587 } |
1588 | |
1589 cg_worklist.clear(); | |
1590 cg_worklist.append(_phantom_object); | |
1921 | 1591 GrowableArray<uint> worklist; |
65 | 1592 |
1593 // 4. Build Connection Graph which need | |
1594 // to walk the connection graph. | |
1921 | 1595 _progress = false; |
244
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1596 for (uint ni = 0; ni < nodes_size(); ni++) { |
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1597 PointsToNode* ptn = ptnode_adr(ni); |
65 | 1598 Node *n = ptn->_node; |
1599 if (n != NULL) { // Call, AddP, LoadP, StoreP | |
1600 build_connection_graph(n, igvn); | |
1601 if (ptn->node_type() != PointsToNode::UnknownType) | |
1602 cg_worklist.append(n->_idx); // Collect CG nodes | |
1921 | 1603 if (!_processed.test(n->_idx)) |
1604 worklist.append(n->_idx); // Collect C/A/L/S nodes | |
65 | 1605 } |
0 | 1606 } |
1607 | |
1921 | 1608 // After IGVN user nodes may have smaller _idx than |
1609 // their inputs so they will be processed first in | |
1610 // previous loop. Because of that not all Graph | |
1611 // edges will be created. Walk over interesting | |
1612 // nodes again until no new edges are created. | |
1613 // | |
1614 // Normally only 1-3 passes needed to build | |
1615 // Connection Graph depending on graph complexity. | |
2086
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1616 // Observed 8 passes in jvm2008 compiler.compiler. |
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1617 // Set limit to 20 to catch situation when something |
1921 | 1618 // did go wrong and recompile the method without EA. |
1619 | |
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1620 #define CG_BUILD_ITER_LIMIT 20 |
1921 | 1621 |
1622 uint length = worklist.length(); | |
1623 int iterations = 0; | |
1624 while(_progress && (iterations++ < CG_BUILD_ITER_LIMIT)) { | |
1625 _progress = false; | |
1626 for( uint next = 0; next < length; ++next ) { | |
1627 int ni = worklist.at(next); | |
1628 PointsToNode* ptn = ptnode_adr(ni); | |
1629 Node* n = ptn->_node; | |
1630 assert(n != NULL, "should be known node"); | |
1631 build_connection_graph(n, igvn); | |
1632 } | |
1633 } | |
1634 if (iterations >= CG_BUILD_ITER_LIMIT) { | |
1635 assert(iterations < CG_BUILD_ITER_LIMIT, | |
1636 err_msg("infinite EA connection graph build with %d nodes and worklist size %d", | |
1637 nodes_size(), length)); | |
1638 // Possible infinite build_connection_graph loop, | |
1639 // retry compilation without escape analysis. | |
1640 C->record_failure(C2Compiler::retry_no_escape_analysis()); | |
1641 _collecting = false; | |
1642 return false; | |
1643 } | |
1644 #undef CG_BUILD_ITER_LIMIT | |
1645 | |
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1646 Arena* arena = Thread::current()->resource_area(); |
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1647 VectorSet visited(arena); |
1921 | 1648 worklist.clear(); |
0 | 1649 |
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1650 // 5. Remove deferred edges from the graph and adjust |
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1651 // escape state of nonescaping objects. |
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1652 cg_length = cg_worklist.length(); |
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1653 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1654 int ni = cg_worklist.at(next); |
244
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1655 PointsToNode* ptn = ptnode_adr(ni); |
0 | 1656 PointsToNode::NodeType nt = ptn->node_type(); |
1657 if (nt == PointsToNode::LocalVar || nt == PointsToNode::Field) { | |
1921 | 1658 remove_deferred(ni, &worklist, &visited); |
244
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1659 Node *n = ptn->_node; |
0 | 1660 if (n->is_AddP()) { |
1100
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1661 // Search for objects which are not scalar replaceable |
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1662 // and adjust their escape state. |
2249 | 1663 adjust_escape_state(ni, igvn); |
0 | 1664 } |
1665 } | |
1666 } | |
65 | 1667 |
244
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1668 // 6. Propagate escape states. |
1921 | 1669 worklist.clear(); |
244
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1670 bool has_non_escaping_obj = false; |
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1671 |
0 | 1672 // push all GlobalEscape nodes on the worklist |
244
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1673 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1674 int nk = cg_worklist.at(next); |
244
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1675 if (ptnode_adr(nk)->escape_state() == PointsToNode::GlobalEscape) |
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1676 worklist.push(nk); |
0 | 1677 } |
244
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1678 // mark all nodes reachable from GlobalEscape nodes |
0 | 1679 while(worklist.length() > 0) { |
244
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1680 PointsToNode* ptn = ptnode_adr(worklist.pop()); |
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1681 uint e_cnt = ptn->edge_count(); |
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1682 for (uint ei = 0; ei < e_cnt; ei++) { |
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1683 uint npi = ptn->edge_target(ei); |
0 | 1684 PointsToNode *np = ptnode_adr(npi); |
65 | 1685 if (np->escape_state() < PointsToNode::GlobalEscape) { |
0 | 1686 np->set_escape_state(PointsToNode::GlobalEscape); |
244
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1687 worklist.push(npi); |
0 | 1688 } |
1689 } | |
1690 } | |
1691 | |
1692 // push all ArgEscape nodes on the worklist | |
244
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1693 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1694 int nk = cg_worklist.at(next); |
244
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1695 if (ptnode_adr(nk)->escape_state() == PointsToNode::ArgEscape) |
0 | 1696 worklist.push(nk); |
1697 } | |
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1698 // mark all nodes reachable from ArgEscape nodes |
0 | 1699 while(worklist.length() > 0) { |
244
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1700 PointsToNode* ptn = ptnode_adr(worklist.pop()); |
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1701 if (ptn->node_type() == PointsToNode::JavaObject) |
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1702 has_non_escaping_obj = true; // Non GlobalEscape |
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1703 uint e_cnt = ptn->edge_count(); |
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1704 for (uint ei = 0; ei < e_cnt; ei++) { |
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1705 uint npi = ptn->edge_target(ei); |
0 | 1706 PointsToNode *np = ptnode_adr(npi); |
65 | 1707 if (np->escape_state() < PointsToNode::ArgEscape) { |
0 | 1708 np->set_escape_state(PointsToNode::ArgEscape); |
244
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1709 worklist.push(npi); |
0 | 1710 } |
1711 } | |
1712 } | |
65 | 1713 |
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1714 GrowableArray<Node*> alloc_worklist; |
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1715 |
65 | 1716 // push all NoEscape nodes on the worklist |
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1717 for( uint next = 0; next < cg_length; ++next ) { |
65 | 1718 int nk = cg_worklist.at(next); |
244
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1719 if (ptnode_adr(nk)->escape_state() == PointsToNode::NoEscape) |
65 | 1720 worklist.push(nk); |
1721 } | |
244
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1722 // mark all nodes reachable from NoEscape nodes |
65 | 1723 while(worklist.length() > 0) { |
244
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1724 PointsToNode* ptn = ptnode_adr(worklist.pop()); |
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1725 if (ptn->node_type() == PointsToNode::JavaObject) |
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1726 has_non_escaping_obj = true; // Non GlobalEscape |
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1727 Node* n = ptn->_node; |
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1728 if (n->is_Allocate() && ptn->_scalar_replaceable ) { |
605 | 1729 // Push scalar replaceable allocations on alloc_worklist |
244
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1730 // for processing in split_unique_types(). |
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1731 alloc_worklist.append(n); |
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1732 } |
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1733 uint e_cnt = ptn->edge_count(); |
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1734 for (uint ei = 0; ei < e_cnt; ei++) { |
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1735 uint npi = ptn->edge_target(ei); |
65 | 1736 PointsToNode *np = ptnode_adr(npi); |
1737 if (np->escape_state() < PointsToNode::NoEscape) { | |
1738 np->set_escape_state(PointsToNode::NoEscape); | |
244
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1739 worklist.push(npi); |
65 | 1740 } |
1741 } | |
1742 } | |
1743 | |
0 | 1744 _collecting = false; |
244
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1745 assert(C->unique() == nodes_size(), "there should be no new ideal nodes during ConnectionGraph build"); |
0 | 1746 |
1634
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1747 #ifndef PRODUCT |
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1748 if (PrintEscapeAnalysis) { |
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1749 dump(); // Dump ConnectionGraph |
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1750 } |
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1751 #endif |
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1752 |
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1753 bool has_scalar_replaceable_candidates = alloc_worklist.length() > 0; |
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1754 if ( has_scalar_replaceable_candidates && |
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1755 C->AliasLevel() >= 3 && EliminateAllocations ) { |
0 | 1756 |
244
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1757 // Now use the escape information to create unique types for |
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1758 // scalar replaceable objects. |
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1759 split_unique_types(alloc_worklist); |
0 | 1760 |
244
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1761 if (C->failing()) return false; |
0 | 1762 |
244
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1763 C->print_method("After Escape Analysis", 2); |
0 | 1764 |
65 | 1765 #ifdef ASSERT |
244
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1766 } else if (Verbose && (PrintEscapeAnalysis || PrintEliminateAllocations)) { |
65 | 1767 tty->print("=== No allocations eliminated for "); |
244
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1768 C->method()->print_short_name(); |
65 | 1769 if(!EliminateAllocations) { |
1770 tty->print(" since EliminateAllocations is off ==="); | |
244
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1771 } else if(!has_scalar_replaceable_candidates) { |
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1772 tty->print(" since there are no scalar replaceable candidates ==="); |
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1773 } else if(C->AliasLevel() < 3) { |
65 | 1774 tty->print(" since AliasLevel < 3 ==="); |
0 | 1775 } |
65 | 1776 tty->cr(); |
1777 #endif | |
0 | 1778 } |
244
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1779 return has_non_escaping_obj; |
0 | 1780 } |
1781 | |
2249 | 1782 // Adjust escape state after Connection Graph is built. |
1783 void ConnectionGraph::adjust_escape_state(int nidx, PhaseTransform* phase) { | |
1100
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1784 PointsToNode* ptn = ptnode_adr(nidx); |
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1785 Node* n = ptn->_node; |
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1786 assert(n->is_AddP(), "Should be called for AddP nodes only"); |
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1787 // Search for objects which are not scalar replaceable. |
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1788 // Mark their escape state as ArgEscape to propagate the state |
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1789 // to referenced objects. |
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1790 // Note: currently there are no difference in compiler optimizations |
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1791 // for ArgEscape objects and NoEscape objects which are not |
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1792 // scalar replaceable. |
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1793 |
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1794 Compile* C = _compile; |
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1795 |
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1796 int offset = ptn->offset(); |
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1797 Node* base = get_addp_base(n); |
2249 | 1798 VectorSet* ptset = PointsTo(base); |
1799 int ptset_size = ptset->Size(); | |
1100
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1800 |
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1801 // Check if a oop field's initializing value is recorded and add |
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1802 // a corresponding NULL field's value if it is not recorded. |
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1803 // Connection Graph does not record a default initialization by NULL |
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1804 // captured by Initialize node. |
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1805 // |
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1806 // Note: it will disable scalar replacement in some cases: |
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1807 // |
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1808 // Point p[] = new Point[1]; |
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1809 // p[0] = new Point(); // Will be not scalar replaced |
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1810 // |
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1811 // but it will save us from incorrect optimizations in next cases: |
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1812 // |
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1813 // Point p[] = new Point[1]; |
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1814 // if ( x ) p[0] = new Point(); // Will be not scalar replaced |
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1815 // |
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1816 // Do a simple control flow analysis to distinguish above cases. |
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1817 // |
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1818 if (offset != Type::OffsetBot && ptset_size == 1) { |
2249 | 1819 uint elem = ptset->getelem(); // Allocation node's index |
1100
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1820 // It does not matter if it is not Allocation node since |
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1821 // only non-escaping allocations are scalar replaced. |
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1822 if (ptnode_adr(elem)->_node->is_Allocate() && |
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1823 ptnode_adr(elem)->escape_state() == PointsToNode::NoEscape) { |
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1824 AllocateNode* alloc = ptnode_adr(elem)->_node->as_Allocate(); |
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1825 InitializeNode* ini = alloc->initialization(); |
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1826 |
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1827 // Check only oop fields. |
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1828 const Type* adr_type = n->as_AddP()->bottom_type(); |
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1829 BasicType basic_field_type = T_INT; |
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1830 if (adr_type->isa_instptr()) { |
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1831 ciField* field = C->alias_type(adr_type->isa_instptr())->field(); |
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1832 if (field != NULL) { |
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1833 basic_field_type = field->layout_type(); |
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1834 } else { |
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1835 // Ignore non field load (for example, klass load) |
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1836 } |
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1837 } else if (adr_type->isa_aryptr()) { |
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1838 const Type* elemtype = adr_type->isa_aryptr()->elem(); |
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1839 basic_field_type = elemtype->array_element_basic_type(); |
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1840 } else { |
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1841 // Raw pointers are used for initializing stores so skip it. |
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1842 assert(adr_type->isa_rawptr() && base->is_Proj() && |
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1843 (base->in(0) == alloc),"unexpected pointer type"); |
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1844 } |
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1845 if (basic_field_type == T_OBJECT || |
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1846 basic_field_type == T_NARROWOOP || |
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1847 basic_field_type == T_ARRAY) { |
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1848 Node* value = NULL; |
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1849 if (ini != NULL) { |
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1850 BasicType ft = UseCompressedOops ? T_NARROWOOP : T_OBJECT; |
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1851 Node* store = ini->find_captured_store(offset, type2aelembytes(ft), phase); |
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1852 if (store != NULL && store->is_Store()) { |
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1853 value = store->in(MemNode::ValueIn); |
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1854 } else if (ptn->edge_count() > 0) { // Are there oop stores? |
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1855 // Check for a store which follows allocation without branches. |
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1856 // For example, a volatile field store is not collected |
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1857 // by Initialize node. TODO: it would be nice to use idom() here. |
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1858 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
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1859 store = n->fast_out(i); |
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1860 if (store->is_Store() && store->in(0) != NULL) { |
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1861 Node* ctrl = store->in(0); |
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1862 while(!(ctrl == ini || ctrl == alloc || ctrl == NULL || |
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1863 ctrl == C->root() || ctrl == C->top() || ctrl->is_Region() || |
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1864 ctrl->is_IfTrue() || ctrl->is_IfFalse())) { |
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1865 ctrl = ctrl->in(0); |
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1866 } |
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1867 if (ctrl == ini || ctrl == alloc) { |
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1868 value = store->in(MemNode::ValueIn); |
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1869 break; |
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1870 } |
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1871 } |
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1872 } |
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1873 } |
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1874 } |
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1875 if (value == NULL || value != ptnode_adr(value->_idx)->_node) { |
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1876 // A field's initializing value was not recorded. Add NULL. |
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1877 uint null_idx = UseCompressedOops ? _noop_null : _oop_null; |
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1878 add_pointsto_edge(nidx, null_idx); |
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1879 } |
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1880 } |
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1881 } |
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1882 } |
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1883 |
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1884 // An object is not scalar replaceable if the field which may point |
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1885 // to it has unknown offset (unknown element of an array of objects). |
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1886 // |
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1887 if (offset == Type::OffsetBot) { |
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1888 uint e_cnt = ptn->edge_count(); |
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1889 for (uint ei = 0; ei < e_cnt; ei++) { |
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1890 uint npi = ptn->edge_target(ei); |
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1891 set_escape_state(npi, PointsToNode::ArgEscape); |
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1892 ptnode_adr(npi)->_scalar_replaceable = false; |
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1893 } |
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1894 } |
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1895 |
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1896 // Currently an object is not scalar replaceable if a LoadStore node |
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1897 // access its field since the field value is unknown after it. |
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1898 // |
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1899 bool has_LoadStore = false; |
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1900 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
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1901 Node *use = n->fast_out(i); |
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1902 if (use->is_LoadStore()) { |
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1903 has_LoadStore = true; |
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1904 break; |
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1905 } |
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1906 } |
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1907 // An object is not scalar replaceable if the address points |
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1908 // to unknown field (unknown element for arrays, offset is OffsetBot). |
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1909 // |
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1910 // Or the address may point to more then one object. This may produce |
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1911 // the false positive result (set scalar_replaceable to false) |
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1912 // since the flow-insensitive escape analysis can't separate |
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1913 // the case when stores overwrite the field's value from the case |
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1914 // when stores happened on different control branches. |
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1915 // |
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1916 if (ptset_size > 1 || ptset_size != 0 && |
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1917 (has_LoadStore || offset == Type::OffsetBot)) { |
2249 | 1918 for( VectorSetI j(ptset); j.test(); ++j ) { |
1100
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1919 set_escape_state(j.elem, PointsToNode::ArgEscape); |
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1920 ptnode_adr(j.elem)->_scalar_replaceable = false; |
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1921 } |
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1922 } |
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1923 } |
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1924 |
0 | 1925 void ConnectionGraph::process_call_arguments(CallNode *call, PhaseTransform *phase) { |
1926 | |
1927 switch (call->Opcode()) { | |
65 | 1928 #ifdef ASSERT |
0 | 1929 case Op_Allocate: |
1930 case Op_AllocateArray: | |
1931 case Op_Lock: | |
1932 case Op_Unlock: | |
65 | 1933 assert(false, "should be done already"); |
0 | 1934 break; |
65 | 1935 #endif |
1100
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1936 case Op_CallLeaf: |
65 | 1937 case Op_CallLeafNoFP: |
1938 { | |
1939 // Stub calls, objects do not escape but they are not scale replaceable. | |
1940 // Adjust escape state for outgoing arguments. | |
1941 const TypeTuple * d = call->tf()->domain(); | |
1942 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
1943 const Type* at = d->field_at(i); | |
1944 Node *arg = call->in(i)->uncast(); | |
1945 const Type *aat = phase->type(arg); | |
1100
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1946 if (!arg->is_top() && at->isa_ptr() && aat->isa_ptr() && |
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1947 ptnode_adr(arg->_idx)->escape_state() < PointsToNode::ArgEscape) { |
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1948 |
65 | 1949 assert(aat == Type::TOP || aat == TypePtr::NULL_PTR || |
1950 aat->isa_ptr() != NULL, "expecting an Ptr"); | |
1100
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1951 #ifdef ASSERT |
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1952 if (!(call->Opcode() == Op_CallLeafNoFP && |
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1953 call->as_CallLeaf()->_name != NULL && |
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1954 (strstr(call->as_CallLeaf()->_name, "arraycopy") != 0) || |
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1955 call->as_CallLeaf()->_name != NULL && |
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1956 (strcmp(call->as_CallLeaf()->_name, "g1_wb_pre") == 0 || |
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1957 strcmp(call->as_CallLeaf()->_name, "g1_wb_post") == 0 )) |
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1958 ) { |
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1959 call->dump(); |
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1960 assert(false, "EA: unexpected CallLeaf"); |
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1961 } |
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1962 #endif |
65 | 1963 set_escape_state(arg->_idx, PointsToNode::ArgEscape); |
1964 if (arg->is_AddP()) { | |
1965 // | |
1966 // The inline_native_clone() case when the arraycopy stub is called | |
1967 // after the allocation before Initialize and CheckCastPP nodes. | |
1968 // | |
1969 // Set AddP's base (Allocate) as not scalar replaceable since | |
1970 // pointer to the base (with offset) is passed as argument. | |
1971 // | |
1972 arg = get_addp_base(arg); | |
1973 } | |
2249 | 1974 for( VectorSetI j(PointsTo(arg)); j.test(); ++j ) { |
65 | 1975 uint pt = j.elem; |
1976 set_escape_state(pt, PointsToNode::ArgEscape); | |
1977 } | |
1978 } | |
1979 } | |
1980 break; | |
1981 } | |
0 | 1982 |
1983 case Op_CallStaticJava: | |
1984 // For a static call, we know exactly what method is being called. | |
1985 // Use bytecode estimator to record the call's escape affects | |
1986 { | |
1987 ciMethod *meth = call->as_CallJava()->method(); | |
65 | 1988 BCEscapeAnalyzer *call_analyzer = (meth !=NULL) ? meth->get_bcea() : NULL; |
1989 // fall-through if not a Java method or no analyzer information | |
1990 if (call_analyzer != NULL) { | |
0 | 1991 const TypeTuple * d = call->tf()->domain(); |
65 | 1992 bool copy_dependencies = false; |
0 | 1993 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
1994 const Type* at = d->field_at(i); | |
1995 int k = i - TypeFunc::Parms; | |
1100
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1996 Node *arg = call->in(i)->uncast(); |
0 | 1997 |
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1998 if (at->isa_oopptr() != NULL && |
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1999 ptnode_adr(arg->_idx)->escape_state() < PointsToNode::GlobalEscape) { |
0 | 2000 |
65 | 2001 bool global_escapes = false; |
2002 bool fields_escapes = false; | |
2003 if (!call_analyzer->is_arg_stack(k)) { | |
2004 // The argument global escapes, mark everything it could point to | |
2005 set_escape_state(arg->_idx, PointsToNode::GlobalEscape); | |
2006 global_escapes = true; | |
2007 } else { | |
2008 if (!call_analyzer->is_arg_local(k)) { | |
2009 // The argument itself doesn't escape, but any fields might | |
2010 fields_escapes = true; | |
0 | 2011 } |
65 | 2012 set_escape_state(arg->_idx, PointsToNode::ArgEscape); |
2013 copy_dependencies = true; | |
2014 } | |
2015 | |
2249 | 2016 for( VectorSetI j(PointsTo(arg)); j.test(); ++j ) { |
65 | 2017 uint pt = j.elem; |
2018 if (global_escapes) { | |
2019 //The argument global escapes, mark everything it could point to | |
2020 set_escape_state(pt, PointsToNode::GlobalEscape); | |
2021 } else { | |
2022 if (fields_escapes) { | |
2023 // The argument itself doesn't escape, but any fields might | |
2024 add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); | |
2025 } | |
2026 set_escape_state(pt, PointsToNode::ArgEscape); | |
0 | 2027 } |
2028 } | |
2029 } | |
2030 } | |
65 | 2031 if (copy_dependencies) |
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2032 call_analyzer->copy_dependencies(_compile->dependencies()); |
0 | 2033 break; |
2034 } | |
2035 } | |
2036 | |
2037 default: | |
65 | 2038 // Fall-through here if not a Java method or no analyzer information |
2039 // or some other type of call, assume the worst case: all arguments | |
0 | 2040 // globally escape. |
2041 { | |
2042 // adjust escape state for outgoing arguments | |
2043 const TypeTuple * d = call->tf()->domain(); | |
2044 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
2045 const Type* at = d->field_at(i); | |
2046 if (at->isa_oopptr() != NULL) { | |
65 | 2047 Node *arg = call->in(i)->uncast(); |
2048 set_escape_state(arg->_idx, PointsToNode::GlobalEscape); | |
2249 | 2049 for( VectorSetI j(PointsTo(arg)); j.test(); ++j ) { |
0 | 2050 uint pt = j.elem; |
2051 set_escape_state(pt, PointsToNode::GlobalEscape); | |
2052 } | |
2053 } | |
2054 } | |
2055 } | |
2056 } | |
2057 } | |
2058 void ConnectionGraph::process_call_result(ProjNode *resproj, PhaseTransform *phase) { | |
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2059 CallNode *call = resproj->in(0)->as_Call(); |
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2060 uint call_idx = call->_idx; |
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2061 uint resproj_idx = resproj->_idx; |
0 | 2062 |
2063 switch (call->Opcode()) { | |
2064 case Op_Allocate: | |
2065 { | |
2066 Node *k = call->in(AllocateNode::KlassNode); | |
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2067 const TypeKlassPtr *kt = k->bottom_type()->isa_klassptr(); |
0 | 2068 assert(kt != NULL, "TypeKlassPtr required."); |
2069 ciKlass* cik = kt->klass(); | |
2070 | |
65 | 2071 PointsToNode::EscapeState es; |
2072 uint edge_to; | |
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2073 if (cik->is_subclass_of(_compile->env()->Thread_klass()) || |
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2074 !cik->is_instance_klass() || // StressReflectiveCode |
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2075 cik->as_instance_klass()->has_finalizer()) { |
65 | 2076 es = PointsToNode::GlobalEscape; |
2077 edge_to = _phantom_object; // Could not be worse | |
0 | 2078 } else { |
65 | 2079 es = PointsToNode::NoEscape; |
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2080 edge_to = call_idx; |
0 | 2081 } |
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2082 set_escape_state(call_idx, es); |
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2083 add_pointsto_edge(resproj_idx, edge_to); |
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2084 _processed.set(resproj_idx); |
0 | 2085 break; |
2086 } | |
2087 | |
2088 case Op_AllocateArray: | |
2089 { | |
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2090 |
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2091 Node *k = call->in(AllocateNode::KlassNode); |
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2092 const TypeKlassPtr *kt = k->bottom_type()->isa_klassptr(); |
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2093 assert(kt != NULL, "TypeKlassPtr required."); |
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2094 ciKlass* cik = kt->klass(); |
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2095 |
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2096 PointsToNode::EscapeState es; |
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2097 uint edge_to; |
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2098 if (!cik->is_array_klass()) { // StressReflectiveCode |
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2099 es = PointsToNode::GlobalEscape; |
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2100 edge_to = _phantom_object; |
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2101 } else { |
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2102 es = PointsToNode::NoEscape; |
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2103 edge_to = call_idx; |
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2104 int length = call->in(AllocateNode::ALength)->find_int_con(-1); |
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2105 if (length < 0 || length > EliminateAllocationArraySizeLimit) { |
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2106 // Not scalar replaceable if the length is not constant or too big. |
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2107 ptnode_adr(call_idx)->_scalar_replaceable = false; |
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2108 } |
65 | 2109 } |
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2110 set_escape_state(call_idx, es); |
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2111 add_pointsto_edge(resproj_idx, edge_to); |
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2112 _processed.set(resproj_idx); |
0 | 2113 break; |
2114 } | |
2115 | |
2116 case Op_CallStaticJava: | |
2117 // For a static call, we know exactly what method is being called. | |
2118 // Use bytecode estimator to record whether the call's return value escapes | |
2119 { | |
65 | 2120 bool done = true; |
0 | 2121 const TypeTuple *r = call->tf()->range(); |
2122 const Type* ret_type = NULL; | |
2123 | |
2124 if (r->cnt() > TypeFunc::Parms) | |
2125 ret_type = r->field_at(TypeFunc::Parms); | |
2126 | |
2127 // Note: we use isa_ptr() instead of isa_oopptr() here because the | |
2128 // _multianewarray functions return a TypeRawPtr. | |
65 | 2129 if (ret_type == NULL || ret_type->isa_ptr() == NULL) { |
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2130 _processed.set(resproj_idx); |
0 | 2131 break; // doesn't return a pointer type |
65 | 2132 } |
0 | 2133 ciMethod *meth = call->as_CallJava()->method(); |
65 | 2134 const TypeTuple * d = call->tf()->domain(); |
0 | 2135 if (meth == NULL) { |
2136 // not a Java method, assume global escape | |
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2137 set_escape_state(call_idx, PointsToNode::GlobalEscape); |
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2138 add_pointsto_edge(resproj_idx, _phantom_object); |
0 | 2139 } else { |
65 | 2140 BCEscapeAnalyzer *call_analyzer = meth->get_bcea(); |
2141 bool copy_dependencies = false; | |
0 | 2142 |
65 | 2143 if (call_analyzer->is_return_allocated()) { |
2144 // Returns a newly allocated unescaped object, simply | |
2145 // update dependency information. | |
2146 // Mark it as NoEscape so that objects referenced by | |
2147 // it's fields will be marked as NoEscape at least. | |
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2148 set_escape_state(call_idx, PointsToNode::NoEscape); |
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2149 add_pointsto_edge(resproj_idx, call_idx); |
65 | 2150 copy_dependencies = true; |
244
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2151 } else if (call_analyzer->is_return_local()) { |
0 | 2152 // determine whether any arguments are returned |
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2153 set_escape_state(call_idx, PointsToNode::NoEscape); |
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2154 bool ret_arg = false; |
0 | 2155 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
2156 const Type* at = d->field_at(i); | |
2157 | |
2158 if (at->isa_oopptr() != NULL) { | |
65 | 2159 Node *arg = call->in(i)->uncast(); |
0 | 2160 |
65 | 2161 if (call_analyzer->is_arg_returned(i - TypeFunc::Parms)) { |
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2162 ret_arg = true; |
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2163 PointsToNode *arg_esp = ptnode_adr(arg->_idx); |
65 | 2164 if (arg_esp->node_type() == PointsToNode::UnknownType) |
2165 done = false; | |
2166 else if (arg_esp->node_type() == PointsToNode::JavaObject) | |
244
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2167 add_pointsto_edge(resproj_idx, arg->_idx); |
0 | 2168 else |
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2169 add_deferred_edge(resproj_idx, arg->_idx); |
0 | 2170 arg_esp->_hidden_alias = true; |
2171 } | |
2172 } | |
2173 } | |
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2174 if (done && !ret_arg) { |
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2175 // Returns unknown object. |
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2176 set_escape_state(call_idx, PointsToNode::GlobalEscape); |
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2177 add_pointsto_edge(resproj_idx, _phantom_object); |
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2178 } |
65 | 2179 copy_dependencies = true; |
0 | 2180 } else { |
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2181 set_escape_state(call_idx, PointsToNode::GlobalEscape); |
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2182 add_pointsto_edge(resproj_idx, _phantom_object); |
65 | 2183 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { |
2184 const Type* at = d->field_at(i); | |
2185 if (at->isa_oopptr() != NULL) { | |
2186 Node *arg = call->in(i)->uncast(); | |
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2187 PointsToNode *arg_esp = ptnode_adr(arg->_idx); |
65 | 2188 arg_esp->_hidden_alias = true; |
2189 } | |
2190 } | |
0 | 2191 } |
65 | 2192 if (copy_dependencies) |
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2193 call_analyzer->copy_dependencies(_compile->dependencies()); |
0 | 2194 } |
65 | 2195 if (done) |
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2196 _processed.set(resproj_idx); |
0 | 2197 break; |
2198 } | |
2199 | |
2200 default: | |
2201 // Some other type of call, assume the worst case that the | |
2202 // returned value, if any, globally escapes. | |
2203 { | |
2204 const TypeTuple *r = call->tf()->range(); | |
2205 if (r->cnt() > TypeFunc::Parms) { | |
2206 const Type* ret_type = r->field_at(TypeFunc::Parms); | |
2207 | |
2208 // Note: we use isa_ptr() instead of isa_oopptr() here because the | |
2209 // _multianewarray functions return a TypeRawPtr. | |
2210 if (ret_type->isa_ptr() != NULL) { | |
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2211 set_escape_state(call_idx, PointsToNode::GlobalEscape); |
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2212 add_pointsto_edge(resproj_idx, _phantom_object); |
0 | 2213 } |
2214 } | |
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2215 _processed.set(resproj_idx); |
0 | 2216 } |
2217 } | |
2218 } | |
2219 | |
65 | 2220 // Populate Connection Graph with Ideal nodes and create simple |
2221 // connection graph edges (do not need to check the node_type of inputs | |
2222 // or to call PointsTo() to walk the connection graph). | |
2223 void ConnectionGraph::record_for_escape_analysis(Node *n, PhaseTransform *phase) { | |
2224 if (_processed.test(n->_idx)) | |
2225 return; // No need to redefine node's state. | |
2226 | |
2227 if (n->is_Call()) { | |
2228 // Arguments to allocation and locking don't escape. | |
2229 if (n->is_Allocate()) { | |
2230 add_node(n, PointsToNode::JavaObject, PointsToNode::UnknownEscape, true); | |
2231 record_for_optimizer(n); | |
2232 } else if (n->is_Lock() || n->is_Unlock()) { | |
2233 // Put Lock and Unlock nodes on IGVN worklist to process them during | |
2234 // the first IGVN optimization when escape information is still available. | |
2235 record_for_optimizer(n); | |
2236 _processed.set(n->_idx); | |
2237 } else { | |
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2238 // Don't mark as processed since call's arguments have to be processed. |
65 | 2239 PointsToNode::NodeType nt = PointsToNode::UnknownType; |
1100
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2240 PointsToNode::EscapeState es = PointsToNode::UnknownEscape; |
65 | 2241 |
2242 // Check if a call returns an object. | |
2243 const TypeTuple *r = n->as_Call()->tf()->range(); | |
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2244 if (r->cnt() > TypeFunc::Parms && |
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2245 r->field_at(TypeFunc::Parms)->isa_ptr() && |
65 | 2246 n->as_Call()->proj_out(TypeFunc::Parms) != NULL) { |
1100
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2247 nt = PointsToNode::JavaObject; |
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2248 if (!n->is_CallStaticJava()) { |
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2249 // Since the called mathod is statically unknown assume |
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2250 // the worst case that the returned value globally escapes. |
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2251 es = PointsToNode::GlobalEscape; |
65 | 2252 } |
2253 } | |
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2254 add_node(n, nt, es, false); |
65 | 2255 } |
2256 return; | |
2257 } | |
2258 | |
2259 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because | |
2260 // ThreadLocal has RawPrt type. | |
2261 switch (n->Opcode()) { | |
2262 case Op_AddP: | |
2263 { | |
2264 add_node(n, PointsToNode::Field, PointsToNode::UnknownEscape, false); | |
2265 break; | |
2266 } | |
2267 case Op_CastX2P: | |
2268 { // "Unsafe" memory access. | |
2269 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
2270 break; | |
2271 } | |
2272 case Op_CastPP: | |
2273 case Op_CheckCastPP: | |
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2274 case Op_EncodeP: |
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2275 case Op_DecodeN: |
65 | 2276 { |
2277 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2278 int ti = n->in(1)->_idx; | |
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2279 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
65 | 2280 if (nt == PointsToNode::UnknownType) { |
2281 _delayed_worklist.push(n); // Process it later. | |
2282 break; | |
2283 } else if (nt == PointsToNode::JavaObject) { | |
2284 add_pointsto_edge(n->_idx, ti); | |
2285 } else { | |
2286 add_deferred_edge(n->_idx, ti); | |
2287 } | |
2288 _processed.set(n->_idx); | |
2289 break; | |
2290 } | |
2291 case Op_ConP: | |
2292 { | |
2293 // assume all pointer constants globally escape except for null | |
2294 PointsToNode::EscapeState es; | |
2295 if (phase->type(n) == TypePtr::NULL_PTR) | |
2296 es = PointsToNode::NoEscape; | |
2297 else | |
2298 es = PointsToNode::GlobalEscape; | |
0 | 2299 |
65 | 2300 add_node(n, PointsToNode::JavaObject, es, true); |
2301 break; | |
2302 } | |
113
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|
2303 case Op_ConN: |
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diff
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|
2304 { |
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|
2305 // assume all narrow oop constants globally escape except for null |
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|
2306 PointsToNode::EscapeState es; |
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|
2307 if (phase->type(n) == TypeNarrowOop::NULL_PTR) |
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2308 es = PointsToNode::NoEscape; |
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|
2309 else |
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|
2310 es = PointsToNode::GlobalEscape; |
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|
2311 |
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|
2312 add_node(n, PointsToNode::JavaObject, es, true); |
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|
2313 break; |
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diff
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|
2314 } |
124
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113
diff
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|
2315 case Op_CreateEx: |
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113
diff
changeset
|
2316 { |
b130b98db9cf
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113
diff
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|
2317 // assume that all exception objects globally escape |
b130b98db9cf
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|
2318 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); |
b130b98db9cf
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113
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changeset
|
2319 break; |
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diff
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|
2320 } |
65 | 2321 case Op_LoadKlass: |
164
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|
2322 case Op_LoadNKlass: |
65 | 2323 { |
2324 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
2325 break; | |
2326 } | |
2327 case Op_LoadP: | |
113
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2328 case Op_LoadN: |
65 | 2329 { |
2330 const Type *t = phase->type(n); | |
253
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diff
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|
2331 if (t->make_ptr() == NULL) { |
65 | 2332 _processed.set(n->_idx); |
2333 return; | |
2334 } | |
2335 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2336 break; | |
2337 } | |
2338 case Op_Parm: | |
2339 { | |
2340 _processed.set(n->_idx); // No need to redefine it state. | |
2341 uint con = n->as_Proj()->_con; | |
2342 if (con < TypeFunc::Parms) | |
2343 return; | |
2344 const Type *t = n->in(0)->as_Start()->_domain->field_at(con); | |
2345 if (t->isa_ptr() == NULL) | |
2346 return; | |
2347 // We have to assume all input parameters globally escape | |
2348 // (Note: passing 'false' since _processed is already set). | |
2349 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, false); | |
2350 break; | |
2351 } | |
2352 case Op_Phi: | |
2353 { | |
253
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diff
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|
2354 const Type *t = n->as_Phi()->type(); |
b0fe4deeb9fb
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diff
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|
2355 if (t->make_ptr() == NULL) { |
b0fe4deeb9fb
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diff
changeset
|
2356 // nothing to do if not an oop or narrow oop |
65 | 2357 _processed.set(n->_idx); |
2358 return; | |
2359 } | |
2360 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2361 uint i; | |
2362 for (i = 1; i < n->req() ; i++) { | |
2363 Node* in = n->in(i); | |
2364 if (in == NULL) | |
2365 continue; // ignore NULL | |
2366 in = in->uncast(); | |
2367 if (in->is_top() || in == n) | |
2368 continue; // ignore top or inputs which go back this node | |
2369 int ti = in->_idx; | |
244
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|
2370 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
65 | 2371 if (nt == PointsToNode::UnknownType) { |
2372 break; | |
2373 } else if (nt == PointsToNode::JavaObject) { | |
2374 add_pointsto_edge(n->_idx, ti); | |
2375 } else { | |
2376 add_deferred_edge(n->_idx, ti); | |
2377 } | |
2378 } | |
2379 if (i >= n->req()) | |
2380 _processed.set(n->_idx); | |
2381 else | |
2382 _delayed_worklist.push(n); | |
2383 break; | |
2384 } | |
2385 case Op_Proj: | |
2386 { | |
1100
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6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2387 // we are only interested in the oop result projection from a call |
65 | 2388 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2389 const TypeTuple *r = n->in(0)->as_Call()->tf()->range(); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2390 assert(r->cnt() > TypeFunc::Parms, "sanity"); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2391 if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2392 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1072
diff
changeset
|
2393 int ti = n->in(0)->_idx; |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
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1072
diff
changeset
|
2394 // The call may not be registered yet (since not all its inputs are registered) |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2395 // if this is the projection from backbranch edge of Phi. |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2396 if (ptnode_adr(ti)->node_type() != PointsToNode::UnknownType) { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2397 process_call_result(n->as_Proj(), phase); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2398 } |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2399 if (!_processed.test(n->_idx)) { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2400 // The call's result may need to be processed later if the call |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
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1072
diff
changeset
|
2401 // returns it's argument and the argument is not processed yet. |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2402 _delayed_worklist.push(n); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2403 } |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2404 break; |
65 | 2405 } |
2406 } | |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2407 _processed.set(n->_idx); |
65 | 2408 break; |
2409 } | |
2410 case Op_Return: | |
2411 { | |
2412 if( n->req() > TypeFunc::Parms && | |
2413 phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { | |
2414 // Treat Return value as LocalVar with GlobalEscape escape state. | |
2415 add_node(n, PointsToNode::LocalVar, PointsToNode::GlobalEscape, false); | |
2416 int ti = n->in(TypeFunc::Parms)->_idx; | |
244
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|
2417 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
65 | 2418 if (nt == PointsToNode::UnknownType) { |
2419 _delayed_worklist.push(n); // Process it later. | |
2420 break; | |
2421 } else if (nt == PointsToNode::JavaObject) { | |
2422 add_pointsto_edge(n->_idx, ti); | |
2423 } else { | |
2424 add_deferred_edge(n->_idx, ti); | |
2425 } | |
2426 } | |
2427 _processed.set(n->_idx); | |
2428 break; | |
2429 } | |
2430 case Op_StoreP: | |
113
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|
2431 case Op_StoreN: |
65 | 2432 { |
2433 const Type *adr_type = phase->type(n->in(MemNode::Address)); | |
221
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168
diff
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|
2434 adr_type = adr_type->make_ptr(); |
65 | 2435 if (adr_type->isa_oopptr()) { |
2436 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2437 } else { | |
2438 Node* adr = n->in(MemNode::Address); | |
2439 if (adr->is_AddP() && phase->type(adr) == TypeRawPtr::NOTNULL && | |
2440 adr->in(AddPNode::Address)->is_Proj() && | |
2441 adr->in(AddPNode::Address)->in(0)->is_Allocate()) { | |
2442 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2443 // We are computing a raw address for a store captured | |
2444 // by an Initialize compute an appropriate address type. | |
2445 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); | |
2446 assert(offs != Type::OffsetBot, "offset must be a constant"); | |
2447 } else { | |
2448 _processed.set(n->_idx); | |
2449 return; | |
2450 } | |
2451 } | |
2452 break; | |
2453 } | |
2454 case Op_StorePConditional: | |
2455 case Op_CompareAndSwapP: | |
113
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diff
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|
2456 case Op_CompareAndSwapN: |
65 | 2457 { |
2458 const Type *adr_type = phase->type(n->in(MemNode::Address)); | |
221
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diff
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|
2459 adr_type = adr_type->make_ptr(); |
65 | 2460 if (adr_type->isa_oopptr()) { |
2461 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2462 } else { | |
2463 _processed.set(n->_idx); | |
2464 return; | |
2465 } | |
2466 break; | |
2467 } | |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2468 case Op_AryEq: |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2469 case Op_StrComp: |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2470 case Op_StrEquals: |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2471 case Op_StrIndexOf: |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2472 { |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2473 // char[] arrays passed to string intrinsics are not scalar replaceable. |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2474 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2475 break; |
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
1072
diff
changeset
|
2476 } |
65 | 2477 case Op_ThreadLocal: |
2478 { | |
2479 add_node(n, PointsToNode::JavaObject, PointsToNode::ArgEscape, true); | |
2480 break; | |
2481 } | |
2482 default: | |
2483 ; | |
2484 // nothing to do | |
2485 } | |
2486 return; | |
2487 } | |
2488 | |
2489 void ConnectionGraph::build_connection_graph(Node *n, PhaseTransform *phase) { | |
244
524eca34ea76
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diff
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|
2490 uint n_idx = n->_idx; |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
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diff
changeset
|
2491 assert(ptnode_adr(n_idx)->_node != NULL, "node should be registered"); |
244
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diff
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|
2492 |
65 | 2493 // Don't set processed bit for AddP, LoadP, StoreP since |
2494 // they may need more then one pass to process. | |
1921 | 2495 // Also don't mark as processed Call nodes since their |
2496 // arguments may need more then one pass to process. | |
244
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diff
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|
2497 if (_processed.test(n_idx)) |
65 | 2498 return; // No need to redefine node's state. |
2499 | |
0 | 2500 if (n->is_Call()) { |
2501 CallNode *call = n->as_Call(); | |
2502 process_call_arguments(call, phase); | |
2503 return; | |
2504 } | |
2505 | |
65 | 2506 switch (n->Opcode()) { |
0 | 2507 case Op_AddP: |
2508 { | |
65 | 2509 Node *base = get_addp_base(n); |
2510 // Create a field edge to this node from everything base could point to. | |
2249 | 2511 for( VectorSetI i(PointsTo(base)); i.test(); ++i ) { |
0 | 2512 uint pt = i.elem; |
244
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|
2513 add_field_edge(pt, n_idx, address_offset(n, phase)); |
65 | 2514 } |
2515 break; | |
2516 } | |
2517 case Op_CastX2P: | |
2518 { | |
2519 assert(false, "Op_CastX2P"); | |
2520 break; | |
2521 } | |
2522 case Op_CastPP: | |
2523 case Op_CheckCastPP: | |
113
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|
2524 case Op_EncodeP: |
ba764ed4b6f2
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102
diff
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|
2525 case Op_DecodeN: |
65 | 2526 { |
2527 int ti = n->in(1)->_idx; | |
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
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1072
diff
changeset
|
2528 assert(ptnode_adr(ti)->node_type() != PointsToNode::UnknownType, "all nodes should be registered"); |
244
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changeset
|
2529 if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) { |
524eca34ea76
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diff
changeset
|
2530 add_pointsto_edge(n_idx, ti); |
65 | 2531 } else { |
244
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diff
changeset
|
2532 add_deferred_edge(n_idx, ti); |
65 | 2533 } |
244
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diff
changeset
|
2534 _processed.set(n_idx); |
65 | 2535 break; |
2536 } | |
2537 case Op_ConP: | |
2538 { | |
2539 assert(false, "Op_ConP"); | |
2540 break; | |
2541 } | |
163 | 2542 case Op_ConN: |
2543 { | |
2544 assert(false, "Op_ConN"); | |
2545 break; | |
2546 } | |
65 | 2547 case Op_CreateEx: |
2548 { | |
2549 assert(false, "Op_CreateEx"); | |
2550 break; | |
2551 } | |
2552 case Op_LoadKlass: | |
164
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163
diff
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|
2553 case Op_LoadNKlass: |
65 | 2554 { |
2555 assert(false, "Op_LoadKlass"); | |
2556 break; | |
2557 } | |
2558 case Op_LoadP: | |
124
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113
diff
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|
2559 case Op_LoadN: |
65 | 2560 { |
2561 const Type *t = phase->type(n); | |
2562 #ifdef ASSERT | |
253
b0fe4deeb9fb
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diff
changeset
|
2563 if (t->make_ptr() == NULL) |
65 | 2564 assert(false, "Op_LoadP"); |
2565 #endif | |
2566 | |
2567 Node* adr = n->in(MemNode::Address)->uncast(); | |
2568 Node* adr_base; | |
2569 if (adr->is_AddP()) { | |
2570 adr_base = get_addp_base(adr); | |
2571 } else { | |
2572 adr_base = adr; | |
2573 } | |
2574 | |
2575 // For everything "adr_base" could point to, create a deferred edge from | |
2576 // this node to each field with the same offset. | |
2577 int offset = address_offset(adr, phase); | |
2249 | 2578 for( VectorSetI i(PointsTo(adr_base)); i.test(); ++i ) { |
65 | 2579 uint pt = i.elem; |
244
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diff
changeset
|
2580 add_deferred_edge_to_fields(n_idx, pt, offset); |
0 | 2581 } |
2582 break; | |
2583 } | |
2584 case Op_Parm: | |
2585 { | |
65 | 2586 assert(false, "Op_Parm"); |
0 | 2587 break; |
2588 } | |
2589 case Op_Phi: | |
2590 { | |
65 | 2591 #ifdef ASSERT |
253
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2592 const Type *t = n->as_Phi()->type(); |
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2593 if (t->make_ptr() == NULL) |
65 | 2594 assert(false, "Op_Phi"); |
2595 #endif | |
2596 for (uint i = 1; i < n->req() ; i++) { | |
2597 Node* in = n->in(i); | |
2598 if (in == NULL) | |
2599 continue; // ignore NULL | |
2600 in = in->uncast(); | |
2601 if (in->is_top() || in == n) | |
2602 continue; // ignore top or inputs which go back this node | |
2603 int ti = in->_idx; | |
307
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2604 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); |
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2605 assert(nt != PointsToNode::UnknownType, "all nodes should be known"); |
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2606 if (nt == PointsToNode::JavaObject) { |
244
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2607 add_pointsto_edge(n_idx, ti); |
65 | 2608 } else { |
244
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2609 add_deferred_edge(n_idx, ti); |
65 | 2610 } |
2611 } | |
244
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2612 _processed.set(n_idx); |
0 | 2613 break; |
2614 } | |
65 | 2615 case Op_Proj: |
0 | 2616 { |
1100
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2617 // we are only interested in the oop result projection from a call |
65 | 2618 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { |
1100
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2619 assert(ptnode_adr(n->in(0)->_idx)->node_type() != PointsToNode::UnknownType, |
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2620 "all nodes should be registered"); |
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2621 const TypeTuple *r = n->in(0)->as_Call()->tf()->range(); |
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2622 assert(r->cnt() > TypeFunc::Parms, "sanity"); |
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2623 if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) { |
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2624 process_call_result(n->as_Proj(), phase); |
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2625 assert(_processed.test(n_idx), "all call results should be processed"); |
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2626 break; |
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2627 } |
65 | 2628 } |
1100
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2629 assert(false, "Op_Proj"); |
0 | 2630 break; |
2631 } | |
65 | 2632 case Op_Return: |
0 | 2633 { |
65 | 2634 #ifdef ASSERT |
2635 if( n->req() <= TypeFunc::Parms || | |
2636 !phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { | |
2637 assert(false, "Op_Return"); | |
0 | 2638 } |
65 | 2639 #endif |
2640 int ti = n->in(TypeFunc::Parms)->_idx; | |
1100
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2641 assert(ptnode_adr(ti)->node_type() != PointsToNode::UnknownType, "node should be registered"); |
244
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2642 if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) { |
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2643 add_pointsto_edge(n_idx, ti); |
65 | 2644 } else { |
244
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2645 add_deferred_edge(n_idx, ti); |
65 | 2646 } |
244
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2647 _processed.set(n_idx); |
0 | 2648 break; |
2649 } | |
2650 case Op_StoreP: | |
124
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2651 case Op_StoreN: |
0 | 2652 case Op_StorePConditional: |
2653 case Op_CompareAndSwapP: | |
124
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2654 case Op_CompareAndSwapN: |
0 | 2655 { |
2656 Node *adr = n->in(MemNode::Address); | |
221
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2657 const Type *adr_type = phase->type(adr)->make_ptr(); |
65 | 2658 #ifdef ASSERT |
0 | 2659 if (!adr_type->isa_oopptr()) |
65 | 2660 assert(phase->type(adr) == TypeRawPtr::NOTNULL, "Op_StoreP"); |
2661 #endif | |
0 | 2662 |
65 | 2663 assert(adr->is_AddP(), "expecting an AddP"); |
2664 Node *adr_base = get_addp_base(adr); | |
2665 Node *val = n->in(MemNode::ValueIn)->uncast(); | |
2666 // For everything "adr_base" could point to, create a deferred edge | |
2667 // to "val" from each field with the same offset. | |
2249 | 2668 for( VectorSetI i(PointsTo(adr_base)); i.test(); ++i ) { |
0 | 2669 uint pt = i.elem; |
65 | 2670 add_edge_from_fields(pt, val->_idx, address_offset(adr, phase)); |
0 | 2671 } |
2672 break; | |
2673 } | |
1100
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2674 case Op_AryEq: |
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2675 case Op_StrComp: |
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2676 case Op_StrEquals: |
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2677 case Op_StrIndexOf: |
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|
2678 { |
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|
2679 // char[] arrays passed to string intrinsic do not escape but |
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2680 // they are not scalar replaceable. Adjust escape state for them. |
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2681 // Start from in(2) edge since in(1) is memory edge. |
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2682 for (uint i = 2; i < n->req(); i++) { |
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2683 Node* adr = n->in(i)->uncast(); |
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2684 const Type *at = phase->type(adr); |
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2685 if (!adr->is_top() && at->isa_ptr()) { |
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2686 assert(at == Type::TOP || at == TypePtr::NULL_PTR || |
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2687 at->isa_ptr() != NULL, "expecting an Ptr"); |
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2688 if (adr->is_AddP()) { |
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2689 adr = get_addp_base(adr); |
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2690 } |
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2691 // Mark as ArgEscape everything "adr" could point to. |
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2692 set_escape_state(adr->_idx, PointsToNode::ArgEscape); |
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2693 } |
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2694 } |
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2695 _processed.set(n_idx); |
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2696 break; |
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|
2697 } |
65 | 2698 case Op_ThreadLocal: |
0 | 2699 { |
65 | 2700 assert(false, "Op_ThreadLocal"); |
0 | 2701 break; |
2702 } | |
2703 default: | |
1100
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2704 // This method should be called only for EA specific nodes. |
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2705 ShouldNotReachHere(); |
0 | 2706 } |
2707 } | |
2708 | |
2709 #ifndef PRODUCT | |
2710 void ConnectionGraph::dump() { | |
2711 bool first = true; | |
2712 | |
244
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2713 uint size = nodes_size(); |
65 | 2714 for (uint ni = 0; ni < size; ni++) { |
244
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2715 PointsToNode *ptn = ptnode_adr(ni); |
65 | 2716 PointsToNode::NodeType ptn_type = ptn->node_type(); |
2717 | |
2718 if (ptn_type != PointsToNode::JavaObject || ptn->_node == NULL) | |
0 | 2719 continue; |
1634
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2720 PointsToNode::EscapeState es = escape_state(ptn->_node); |
65 | 2721 if (ptn->_node->is_Allocate() && (es == PointsToNode::NoEscape || Verbose)) { |
2722 if (first) { | |
2723 tty->cr(); | |
2724 tty->print("======== Connection graph for "); | |
244
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2725 _compile->method()->print_short_name(); |
65 | 2726 tty->cr(); |
2727 first = false; | |
2728 } | |
2729 tty->print("%6d ", ni); | |
2730 ptn->dump(); | |
2731 // Print all locals which reference this allocation | |
2732 for (uint li = ni; li < size; li++) { | |
244
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2733 PointsToNode *ptn_loc = ptnode_adr(li); |
65 | 2734 PointsToNode::NodeType ptn_loc_type = ptn_loc->node_type(); |
2735 if ( ptn_loc_type == PointsToNode::LocalVar && ptn_loc->_node != NULL && | |
2736 ptn_loc->edge_count() == 1 && ptn_loc->edge_target(0) == ni ) { | |
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2737 ptnode_adr(li)->dump(false); |
0 | 2738 } |
2739 } | |
65 | 2740 if (Verbose) { |
2741 // Print all fields which reference this allocation | |
2742 for (uint i = 0; i < ptn->edge_count(); i++) { | |
2743 uint ei = ptn->edge_target(i); | |
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2744 ptnode_adr(ei)->dump(false); |
65 | 2745 } |
2746 } | |
2747 tty->cr(); | |
0 | 2748 } |
2749 } | |
2750 } | |
2751 #endif |