Mercurial > hg > truffle
comparison src/share/vm/opto/escape.cpp @ 5948:ee138854b3a6
7147744: CTW: assert(false) failed: infinite EA connection graph build
Summary: rewrote Connection graph construction code in EA to reduce time spent there.
Reviewed-by: never
author | kvn |
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date | Mon, 12 Mar 2012 10:46:47 -0700 |
parents | 9a72c7ece7fb |
children | ed4c92f54c2d |
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5933:fde683df4c27 | 5948:ee138854b3a6 |
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22 * | 22 * |
23 */ | 23 */ |
24 | 24 |
25 #include "precompiled.hpp" | 25 #include "precompiled.hpp" |
26 #include "ci/bcEscapeAnalyzer.hpp" | 26 #include "ci/bcEscapeAnalyzer.hpp" |
27 #include "compiler/compileLog.hpp" | |
27 #include "libadt/vectset.hpp" | 28 #include "libadt/vectset.hpp" |
28 #include "memory/allocation.hpp" | 29 #include "memory/allocation.hpp" |
29 #include "opto/c2compiler.hpp" | 30 #include "opto/c2compiler.hpp" |
30 #include "opto/callnode.hpp" | 31 #include "opto/callnode.hpp" |
31 #include "opto/cfgnode.hpp" | 32 #include "opto/cfgnode.hpp" |
32 #include "opto/compile.hpp" | 33 #include "opto/compile.hpp" |
33 #include "opto/escape.hpp" | 34 #include "opto/escape.hpp" |
34 #include "opto/phaseX.hpp" | 35 #include "opto/phaseX.hpp" |
35 #include "opto/rootnode.hpp" | 36 #include "opto/rootnode.hpp" |
36 | 37 |
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 | |
53 static const char *node_type_names[] = { | |
54 "UnknownType", | |
55 "JavaObject", | |
56 "LocalVar", | |
57 "Field" | |
58 }; | |
59 | |
60 static const char *esc_names[] = { | |
61 "UnknownEscape", | |
62 "NoEscape", | |
63 "ArgEscape", | |
64 "GlobalEscape" | |
65 }; | |
66 | |
67 static const char *edge_type_suffix[] = { | |
68 "?", // UnknownEdge | |
69 "P", // PointsToEdge | |
70 "D", // DeferredEdge | |
71 "F" // FieldEdge | |
72 }; | |
73 | |
74 void PointsToNode::dump(bool print_state) const { | |
75 NodeType nt = node_type(); | |
76 tty->print("%s ", node_type_names[(int) nt]); | |
77 if (print_state) { | |
78 EscapeState es = escape_state(); | |
79 tty->print("%s %s ", esc_names[(int) es], _scalar_replaceable ? "":"NSR"); | |
80 } | |
81 tty->print("[["); | |
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 | |
93 ConnectionGraph::ConnectionGraph(Compile * C, PhaseIterGVN *igvn) : | 38 ConnectionGraph::ConnectionGraph(Compile * C, PhaseIterGVN *igvn) : |
94 _nodes(C->comp_arena(), C->unique(), C->unique(), PointsToNode()), | 39 _nodes(C->comp_arena(), C->unique(), C->unique(), NULL), |
95 _processed(C->comp_arena()), | |
96 pt_ptset(C->comp_arena()), | |
97 pt_visited(C->comp_arena()), | |
98 pt_worklist(C->comp_arena(), 4, 0, 0), | |
99 _collecting(true), | 40 _collecting(true), |
100 _progress(false), | 41 _verify(false), |
101 _compile(C), | 42 _compile(C), |
102 _igvn(igvn), | 43 _igvn(igvn), |
103 _node_map(C->comp_arena()) { | 44 _node_map(C->comp_arena()) { |
104 | 45 // Add unknown java object. |
105 _phantom_object = C->top()->_idx, | 46 add_java_object(C->top(), PointsToNode::GlobalEscape); |
106 add_node(C->top(), PointsToNode::JavaObject, PointsToNode::GlobalEscape,true); | 47 phantom_obj = ptnode_adr(C->top()->_idx)->as_JavaObject(); |
107 | |
108 // Add ConP(#NULL) and ConN(#NULL) nodes. | 48 // Add ConP(#NULL) and ConN(#NULL) nodes. |
109 Node* oop_null = igvn->zerocon(T_OBJECT); | 49 Node* oop_null = igvn->zerocon(T_OBJECT); |
110 _oop_null = oop_null->_idx; | 50 assert(oop_null->_idx < nodes_size(), "should be created already"); |
111 assert(_oop_null < nodes_size(), "should be created already"); | 51 add_java_object(oop_null, PointsToNode::NoEscape); |
112 add_node(oop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true); | 52 null_obj = ptnode_adr(oop_null->_idx)->as_JavaObject(); |
113 | |
114 if (UseCompressedOops) { | 53 if (UseCompressedOops) { |
115 Node* noop_null = igvn->zerocon(T_NARROWOOP); | 54 Node* noop_null = igvn->zerocon(T_NARROWOOP); |
116 _noop_null = noop_null->_idx; | 55 assert(noop_null->_idx < nodes_size(), "should be created already"); |
117 assert(_noop_null < nodes_size(), "should be created already"); | 56 map_ideal_node(noop_null, null_obj); |
118 add_node(noop_null, PointsToNode::JavaObject, PointsToNode::NoEscape, true); | |
119 } else { | |
120 _noop_null = _oop_null; // Should be initialized | |
121 } | 57 } |
122 _pcmp_neq = NULL; // Should be initialized | 58 _pcmp_neq = NULL; // Should be initialized |
123 _pcmp_eq = NULL; | 59 _pcmp_eq = NULL; |
124 } | 60 } |
125 | 61 |
126 void ConnectionGraph::add_pointsto_edge(uint from_i, uint to_i) { | 62 bool ConnectionGraph::has_candidates(Compile *C) { |
127 PointsToNode *f = ptnode_adr(from_i); | 63 // EA brings benefits only when the code has allocations and/or locks which |
128 PointsToNode *t = ptnode_adr(to_i); | 64 // are represented by ideal Macro nodes. |
129 | 65 int cnt = C->macro_count(); |
130 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | 66 for( int i=0; i < cnt; i++ ) { |
131 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of PointsTo edge"); | 67 Node *n = C->macro_node(i); |
132 assert(t->node_type() == PointsToNode::JavaObject, "invalid destination of PointsTo edge"); | 68 if ( n->is_Allocate() ) |
133 if (to_i == _phantom_object) { // Quick test for most common object | 69 return true; |
134 if (f->has_unknown_ptr()) { | 70 if( n->is_Lock() ) { |
71 Node* obj = n->as_Lock()->obj_node()->uncast(); | |
72 if( !(obj->is_Parm() || obj->is_Con()) ) | |
73 return true; | |
74 } | |
75 } | |
76 return false; | |
77 } | |
78 | |
79 void ConnectionGraph::do_analysis(Compile *C, PhaseIterGVN *igvn) { | |
80 Compile::TracePhase t2("escapeAnalysis", &Phase::_t_escapeAnalysis, true); | |
81 ResourceMark rm; | |
82 | |
83 // Add ConP#NULL and ConN#NULL nodes before ConnectionGraph construction | |
84 // to create space for them in ConnectionGraph::_nodes[]. | |
85 Node* oop_null = igvn->zerocon(T_OBJECT); | |
86 Node* noop_null = igvn->zerocon(T_NARROWOOP); | |
87 ConnectionGraph* congraph = new(C->comp_arena()) ConnectionGraph(C, igvn); | |
88 // Perform escape analysis | |
89 if (congraph->compute_escape()) { | |
90 // There are non escaping objects. | |
91 C->set_congraph(congraph); | |
92 } | |
93 // Cleanup. | |
94 if (oop_null->outcnt() == 0) | |
95 igvn->hash_delete(oop_null); | |
96 if (noop_null->outcnt() == 0) | |
97 igvn->hash_delete(noop_null); | |
98 } | |
99 | |
100 bool ConnectionGraph::compute_escape() { | |
101 Compile* C = _compile; | |
102 PhaseGVN* igvn = _igvn; | |
103 | |
104 // Worklists used by EA. | |
105 Unique_Node_List delayed_worklist; | |
106 GrowableArray<Node*> alloc_worklist; | |
107 GrowableArray<Node*> ptr_cmp_worklist; | |
108 GrowableArray<Node*> storestore_worklist; | |
109 GrowableArray<PointsToNode*> ptnodes_worklist; | |
110 GrowableArray<JavaObjectNode*> java_objects_worklist; | |
111 GrowableArray<JavaObjectNode*> non_escaped_worklist; | |
112 GrowableArray<FieldNode*> oop_fields_worklist; | |
113 DEBUG_ONLY( GrowableArray<Node*> addp_worklist; ) | |
114 | |
115 { Compile::TracePhase t3("connectionGraph", &Phase::_t_connectionGraph, true); | |
116 | |
117 // 1. Populate Connection Graph (CG) with PointsTo nodes. | |
118 ideal_nodes.map(C->unique(), NULL); // preallocate space | |
119 // Initialize worklist | |
120 if (C->root() != NULL) { | |
121 ideal_nodes.push(C->root()); | |
122 } | |
123 for( uint next = 0; next < ideal_nodes.size(); ++next ) { | |
124 Node* n = ideal_nodes.at(next); | |
125 // Create PointsTo nodes and add them to Connection Graph. Called | |
126 // only once per ideal node since ideal_nodes is Unique_Node list. | |
127 add_node_to_connection_graph(n, &delayed_worklist); | |
128 PointsToNode* ptn = ptnode_adr(n->_idx); | |
129 if (ptn != NULL) { | |
130 ptnodes_worklist.append(ptn); | |
131 if (ptn->is_JavaObject()) { | |
132 java_objects_worklist.append(ptn->as_JavaObject()); | |
133 if ((n->is_Allocate() || n->is_CallStaticJava()) && | |
134 (ptn->escape_state() < PointsToNode::GlobalEscape)) { | |
135 // Only allocations and java static calls results are interesting. | |
136 non_escaped_worklist.append(ptn->as_JavaObject()); | |
137 } | |
138 } else if (ptn->is_Field() && ptn->as_Field()->is_oop()) { | |
139 oop_fields_worklist.append(ptn->as_Field()); | |
140 } | |
141 } | |
142 if (n->is_MergeMem()) { | |
143 // Collect all MergeMem nodes to add memory slices for | |
144 // scalar replaceable objects in split_unique_types(). | |
145 _mergemem_worklist.append(n->as_MergeMem()); | |
146 } else if (OptimizePtrCompare && n->is_Cmp() && | |
147 (n->Opcode() == Op_CmpP || n->Opcode() == Op_CmpN)) { | |
148 // Collect compare pointers nodes. | |
149 ptr_cmp_worklist.append(n); | |
150 } else if (n->is_MemBarStoreStore()) { | |
151 // Collect all MemBarStoreStore nodes so that depending on the | |
152 // escape status of the associated Allocate node some of them | |
153 // may be eliminated. | |
154 storestore_worklist.append(n); | |
155 #ifdef ASSERT | |
156 } else if(n->is_AddP()) { | |
157 // Collect address nodes for graph verification. | |
158 addp_worklist.append(n); | |
159 #endif | |
160 } | |
161 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
162 Node* m = n->fast_out(i); // Get user | |
163 ideal_nodes.push(m); | |
164 } | |
165 } | |
166 if (non_escaped_worklist.length() == 0) { | |
167 _collecting = false; | |
168 return false; // Nothing to do. | |
169 } | |
170 // Add final simple edges to graph. | |
171 while(delayed_worklist.size() > 0) { | |
172 Node* n = delayed_worklist.pop(); | |
173 add_final_edges(n); | |
174 } | |
175 int ptnodes_length = ptnodes_worklist.length(); | |
176 | |
177 #ifdef ASSERT | |
178 if (VerifyConnectionGraph) { | |
179 // Verify that no new simple edges could be created and all | |
180 // local vars has edges. | |
181 _verify = true; | |
182 for (int next = 0; next < ptnodes_length; ++next) { | |
183 PointsToNode* ptn = ptnodes_worklist.at(next); | |
184 add_final_edges(ptn->ideal_node()); | |
185 if (ptn->is_LocalVar() && ptn->edge_count() == 0) { | |
186 ptn->dump(); | |
187 assert(ptn->as_LocalVar()->edge_count() > 0, "sanity"); | |
188 } | |
189 } | |
190 _verify = false; | |
191 } | |
192 #endif | |
193 | |
194 // 2. Finish Graph construction by propagating references to all | |
195 // java objects through graph. | |
196 if (!complete_connection_graph(ptnodes_worklist, non_escaped_worklist, | |
197 java_objects_worklist, oop_fields_worklist)) { | |
198 // All objects escaped or hit time or iterations limits. | |
199 _collecting = false; | |
200 return false; | |
201 } | |
202 | |
203 // 3. Adjust scalar_replaceable state of nonescaping objects and push | |
204 // scalar replaceable allocations on alloc_worklist for processing | |
205 // in split_unique_types(). | |
206 int non_escaped_length = non_escaped_worklist.length(); | |
207 for (int next = 0; next < non_escaped_length; next++) { | |
208 JavaObjectNode* ptn = non_escaped_worklist.at(next); | |
209 if (ptn->escape_state() == PointsToNode::NoEscape && | |
210 ptn->scalar_replaceable()) { | |
211 adjust_scalar_replaceable_state(ptn); | |
212 if (ptn->scalar_replaceable()) { | |
213 alloc_worklist.append(ptn->ideal_node()); | |
214 } | |
215 } | |
216 } | |
217 | |
218 #ifdef ASSERT | |
219 if (VerifyConnectionGraph) { | |
220 // Verify that graph is complete - no new edges could be added or needed. | |
221 verify_connection_graph(ptnodes_worklist, non_escaped_worklist, | |
222 java_objects_worklist, addp_worklist); | |
223 } | |
224 assert(C->unique() == nodes_size(), "no new ideal nodes should be added during ConnectionGraph build"); | |
225 assert(null_obj->escape_state() == PointsToNode::NoEscape && | |
226 null_obj->edge_count() == 0 && | |
227 !null_obj->arraycopy_src() && | |
228 !null_obj->arraycopy_dst(), "sanity"); | |
229 #endif | |
230 | |
231 _collecting = false; | |
232 | |
233 } // TracePhase t3("connectionGraph") | |
234 | |
235 // 4. Optimize ideal graph based on EA information. | |
236 bool has_non_escaping_obj = (non_escaped_worklist.length() > 0); | |
237 if (has_non_escaping_obj) { | |
238 optimize_ideal_graph(ptr_cmp_worklist, storestore_worklist); | |
239 } | |
240 | |
241 #ifndef PRODUCT | |
242 if (PrintEscapeAnalysis) { | |
243 dump(ptnodes_worklist); // Dump ConnectionGraph | |
244 } | |
245 #endif | |
246 | |
247 bool has_scalar_replaceable_candidates = (alloc_worklist.length() > 0); | |
248 #ifdef ASSERT | |
249 if (VerifyConnectionGraph) { | |
250 int alloc_length = alloc_worklist.length(); | |
251 for (int next = 0; next < alloc_length; ++next) { | |
252 Node* n = alloc_worklist.at(next); | |
253 PointsToNode* ptn = ptnode_adr(n->_idx); | |
254 assert(ptn->escape_state() == PointsToNode::NoEscape && ptn->scalar_replaceable(), "sanity"); | |
255 } | |
256 } | |
257 #endif | |
258 | |
259 // 5. Separate memory graph for scalar replaceable allcations. | |
260 if (has_scalar_replaceable_candidates && | |
261 C->AliasLevel() >= 3 && EliminateAllocations) { | |
262 // Now use the escape information to create unique types for | |
263 // scalar replaceable objects. | |
264 split_unique_types(alloc_worklist); | |
265 if (C->failing()) return false; | |
266 C->print_method("After Escape Analysis", 2); | |
267 | |
268 #ifdef ASSERT | |
269 } else if (Verbose && (PrintEscapeAnalysis || PrintEliminateAllocations)) { | |
270 tty->print("=== No allocations eliminated for "); | |
271 C->method()->print_short_name(); | |
272 if(!EliminateAllocations) { | |
273 tty->print(" since EliminateAllocations is off ==="); | |
274 } else if(!has_scalar_replaceable_candidates) { | |
275 tty->print(" since there are no scalar replaceable candidates ==="); | |
276 } else if(C->AliasLevel() < 3) { | |
277 tty->print(" since AliasLevel < 3 ==="); | |
278 } | |
279 tty->cr(); | |
280 #endif | |
281 } | |
282 return has_non_escaping_obj; | |
283 } | |
284 | |
285 // Populate Connection Graph with PointsTo nodes and create simple | |
286 // connection graph edges. | |
287 void ConnectionGraph::add_node_to_connection_graph(Node *n, Unique_Node_List *delayed_worklist) { | |
288 assert(!_verify, "this method sould not be called for verification"); | |
289 PhaseGVN* igvn = _igvn; | |
290 uint n_idx = n->_idx; | |
291 PointsToNode* n_ptn = ptnode_adr(n_idx); | |
292 if (n_ptn != NULL) | |
293 return; // No need to redefine PointsTo node during first iteration. | |
294 | |
295 if (n->is_Call()) { | |
296 // Arguments to allocation and locking don't escape. | |
297 if (n->is_AbstractLock()) { | |
298 // Put Lock and Unlock nodes on IGVN worklist to process them during | |
299 // first IGVN optimization when escape information is still available. | |
300 record_for_optimizer(n); | |
301 } else if (n->is_Allocate()) { | |
302 add_call_node(n->as_Call()); | |
303 record_for_optimizer(n); | |
304 } else { | |
305 if (n->is_CallStaticJava()) { | |
306 const char* name = n->as_CallStaticJava()->_name; | |
307 if (name != NULL && strcmp(name, "uncommon_trap") == 0) | |
308 return; // Skip uncommon traps | |
309 } | |
310 // Don't mark as processed since call's arguments have to be processed. | |
311 delayed_worklist->push(n); | |
312 // Check if a call returns an object. | |
313 if (n->as_Call()->returns_pointer() && | |
314 n->as_Call()->proj_out(TypeFunc::Parms) != NULL) { | |
315 add_call_node(n->as_Call()); | |
316 } | |
317 } | |
318 return; | |
319 } | |
320 // Put this check here to process call arguments since some call nodes | |
321 // point to phantom_obj. | |
322 if (n_ptn == phantom_obj || n_ptn == null_obj) | |
323 return; // Skip predefined nodes. | |
324 | |
325 int opcode = n->Opcode(); | |
326 switch (opcode) { | |
327 case Op_AddP: { | |
328 Node* base = get_addp_base(n); | |
329 PointsToNode* ptn_base = ptnode_adr(base->_idx); | |
330 // Field nodes are created for all field types. They are used in | |
331 // adjust_scalar_replaceable_state() and split_unique_types(). | |
332 // Note, non-oop fields will have only base edges in Connection | |
333 // Graph because such fields are not used for oop loads and stores. | |
334 int offset = address_offset(n, igvn); | |
335 add_field(n, PointsToNode::NoEscape, offset); | |
336 if (ptn_base == NULL) { | |
337 delayed_worklist->push(n); // Process it later. | |
338 } else { | |
339 n_ptn = ptnode_adr(n_idx); | |
340 add_base(n_ptn->as_Field(), ptn_base); | |
341 } | |
342 break; | |
343 } | |
344 case Op_CastX2P: { | |
345 map_ideal_node(n, phantom_obj); | |
346 break; | |
347 } | |
348 case Op_CastPP: | |
349 case Op_CheckCastPP: | |
350 case Op_EncodeP: | |
351 case Op_DecodeN: { | |
352 add_local_var_and_edge(n, PointsToNode::NoEscape, | |
353 n->in(1), delayed_worklist); | |
354 break; | |
355 } | |
356 case Op_CMoveP: { | |
357 add_local_var(n, PointsToNode::NoEscape); | |
358 // Do not add edges during first iteration because some could be | |
359 // not defined yet. | |
360 delayed_worklist->push(n); | |
361 break; | |
362 } | |
363 case Op_ConP: | |
364 case Op_ConN: { | |
365 // assume all oop constants globally escape except for null | |
366 PointsToNode::EscapeState es; | |
367 if (igvn->type(n) == TypePtr::NULL_PTR || | |
368 igvn->type(n) == TypeNarrowOop::NULL_PTR) { | |
369 es = PointsToNode::NoEscape; | |
370 } else { | |
371 es = PointsToNode::GlobalEscape; | |
372 } | |
373 add_java_object(n, es); | |
374 break; | |
375 } | |
376 case Op_CreateEx: { | |
377 // assume that all exception objects globally escape | |
378 add_java_object(n, PointsToNode::GlobalEscape); | |
379 break; | |
380 } | |
381 case Op_LoadKlass: | |
382 case Op_LoadNKlass: { | |
383 // Unknown class is loaded | |
384 map_ideal_node(n, phantom_obj); | |
385 break; | |
386 } | |
387 case Op_LoadP: | |
388 case Op_LoadN: | |
389 case Op_LoadPLocked: { | |
390 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because | |
391 // ThreadLocal has RawPrt type. | |
392 const Type* t = igvn->type(n); | |
393 if (t->make_ptr() != NULL) { | |
394 Node* adr = n->in(MemNode::Address); | |
395 #ifdef ASSERT | |
396 if (!adr->is_AddP()) { | |
397 assert(igvn->type(adr)->isa_rawptr(), "sanity"); | |
398 } else { | |
399 assert((ptnode_adr(adr->_idx) == NULL || | |
400 ptnode_adr(adr->_idx)->as_Field()->is_oop()), "sanity"); | |
401 } | |
402 #endif | |
403 add_local_var_and_edge(n, PointsToNode::NoEscape, | |
404 adr, delayed_worklist); | |
405 } | |
406 break; | |
407 } | |
408 case Op_Parm: { | |
409 map_ideal_node(n, phantom_obj); | |
410 break; | |
411 } | |
412 case Op_PartialSubtypeCheck: { | |
413 // Produces Null or notNull and is used in only in CmpP so | |
414 // phantom_obj could be used. | |
415 map_ideal_node(n, phantom_obj); // Result is unknown | |
416 break; | |
417 } | |
418 case Op_Phi: { | |
419 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because | |
420 // ThreadLocal has RawPrt type. | |
421 const Type* t = n->as_Phi()->type(); | |
422 if (t->make_ptr() != NULL) { | |
423 add_local_var(n, PointsToNode::NoEscape); | |
424 // Do not add edges during first iteration because some could be | |
425 // not defined yet. | |
426 delayed_worklist->push(n); | |
427 } | |
428 break; | |
429 } | |
430 case Op_Proj: { | |
431 // we are only interested in the oop result projection from a call | |
432 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() && | |
433 n->in(0)->as_Call()->returns_pointer()) { | |
434 add_local_var_and_edge(n, PointsToNode::NoEscape, | |
435 n->in(0), delayed_worklist); | |
436 } | |
437 break; | |
438 } | |
439 case Op_Rethrow: // Exception object escapes | |
440 case Op_Return: { | |
441 if (n->req() > TypeFunc::Parms && | |
442 igvn->type(n->in(TypeFunc::Parms))->isa_oopptr()) { | |
443 // Treat Return value as LocalVar with GlobalEscape escape state. | |
444 add_local_var_and_edge(n, PointsToNode::GlobalEscape, | |
445 n->in(TypeFunc::Parms), delayed_worklist); | |
446 } | |
447 break; | |
448 } | |
449 case Op_StoreP: | |
450 case Op_StoreN: | |
451 case Op_StorePConditional: | |
452 case Op_CompareAndSwapP: | |
453 case Op_CompareAndSwapN: { | |
454 Node* adr = n->in(MemNode::Address); | |
455 const Type *adr_type = igvn->type(adr); | |
456 adr_type = adr_type->make_ptr(); | |
457 if (adr_type->isa_oopptr() || | |
458 (opcode == Op_StoreP || opcode == Op_StoreN) && | |
459 (adr_type == TypeRawPtr::NOTNULL && | |
460 adr->in(AddPNode::Address)->is_Proj() && | |
461 adr->in(AddPNode::Address)->in(0)->is_Allocate())) { | |
462 delayed_worklist->push(n); // Process it later. | |
463 #ifdef ASSERT | |
464 assert(adr->is_AddP(), "expecting an AddP"); | |
465 if (adr_type == TypeRawPtr::NOTNULL) { | |
466 // Verify a raw address for a store captured by Initialize node. | |
467 int offs = (int)igvn->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); | |
468 assert(offs != Type::OffsetBot, "offset must be a constant"); | |
469 } | |
470 } else { | |
471 // Ignore copy the displaced header to the BoxNode (OSR compilation). | |
472 if (adr->is_BoxLock()) | |
473 break; | |
474 | |
475 if (!adr->is_AddP()) { | |
476 n->dump(1); | |
477 assert(adr->is_AddP(), "expecting an AddP"); | |
478 } | |
479 // Ignore G1 barrier's stores. | |
480 if (!UseG1GC || (opcode != Op_StoreP) || | |
481 (adr_type != TypeRawPtr::BOTTOM)) { | |
482 n->dump(1); | |
483 assert(false, "not G1 barrier raw StoreP"); | |
484 } | |
485 #endif | |
486 } | |
487 break; | |
488 } | |
489 case Op_AryEq: | |
490 case Op_StrComp: | |
491 case Op_StrEquals: | |
492 case Op_StrIndexOf: { | |
493 add_local_var(n, PointsToNode::ArgEscape); | |
494 delayed_worklist->push(n); // Process it later. | |
495 break; | |
496 } | |
497 case Op_ThreadLocal: { | |
498 add_java_object(n, PointsToNode::ArgEscape); | |
499 break; | |
500 } | |
501 default: | |
502 ; // Do nothing for nodes not related to EA. | |
503 } | |
504 return; | |
505 } | |
506 | |
507 #ifdef ASSERT | |
508 #define ELSE_FAIL(name) \ | |
509 /* Should not be called for not pointer type. */ \ | |
510 n->dump(1); \ | |
511 assert(false, name); \ | |
512 break; | |
513 #else | |
514 #define ELSE_FAIL(name) \ | |
515 break; | |
516 #endif | |
517 | |
518 // Add final simple edges to graph. | |
519 void ConnectionGraph::add_final_edges(Node *n) { | |
520 PointsToNode* n_ptn = ptnode_adr(n->_idx); | |
521 #ifdef ASSERT | |
522 if (_verify && n_ptn->is_JavaObject()) | |
523 return; // This method does not change graph for JavaObject. | |
524 #endif | |
525 | |
526 if (n->is_Call()) { | |
527 process_call_arguments(n->as_Call()); | |
528 return; | |
529 } | |
530 assert(n->is_Store() || n->is_LoadStore() || | |
531 (n_ptn != NULL) && (n_ptn->ideal_node() != NULL), | |
532 "node should be registered already"); | |
533 int opcode = n->Opcode(); | |
534 switch (opcode) { | |
535 case Op_AddP: { | |
536 Node* base = get_addp_base(n); | |
537 PointsToNode* ptn_base = ptnode_adr(base->_idx); | |
538 assert(ptn_base != NULL, "field's base should be registered"); | |
539 add_base(n_ptn->as_Field(), ptn_base); | |
540 break; | |
541 } | |
542 case Op_CastPP: | |
543 case Op_CheckCastPP: | |
544 case Op_EncodeP: | |
545 case Op_DecodeN: { | |
546 add_local_var_and_edge(n, PointsToNode::NoEscape, | |
547 n->in(1), NULL); | |
548 break; | |
549 } | |
550 case Op_CMoveP: { | |
551 for (uint i = CMoveNode::IfFalse; i < n->req(); i++) { | |
552 Node* in = n->in(i); | |
553 if (in == NULL) | |
554 continue; // ignore NULL | |
555 Node* uncast_in = in->uncast(); | |
556 if (uncast_in->is_top() || uncast_in == n) | |
557 continue; // ignore top or inputs which go back this node | |
558 PointsToNode* ptn = ptnode_adr(in->_idx); | |
559 assert(ptn != NULL, "node should be registered"); | |
560 add_edge(n_ptn, ptn); | |
561 } | |
562 break; | |
563 } | |
564 case Op_LoadP: | |
565 case Op_LoadN: | |
566 case Op_LoadPLocked: { | |
567 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because | |
568 // ThreadLocal has RawPrt type. | |
569 const Type* t = _igvn->type(n); | |
570 if (t->make_ptr() != NULL) { | |
571 Node* adr = n->in(MemNode::Address); | |
572 add_local_var_and_edge(n, PointsToNode::NoEscape, adr, NULL); | |
573 break; | |
574 } | |
575 ELSE_FAIL("Op_LoadP"); | |
576 } | |
577 case Op_Phi: { | |
578 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because | |
579 // ThreadLocal has RawPrt type. | |
580 const Type* t = n->as_Phi()->type(); | |
581 if (t->make_ptr() != NULL) { | |
582 for (uint i = 1; i < n->req(); i++) { | |
583 Node* in = n->in(i); | |
584 if (in == NULL) | |
585 continue; // ignore NULL | |
586 Node* uncast_in = in->uncast(); | |
587 if (uncast_in->is_top() || uncast_in == n) | |
588 continue; // ignore top or inputs which go back this node | |
589 PointsToNode* ptn = ptnode_adr(in->_idx); | |
590 assert(ptn != NULL, "node should be registered"); | |
591 add_edge(n_ptn, ptn); | |
592 } | |
593 break; | |
594 } | |
595 ELSE_FAIL("Op_Phi"); | |
596 } | |
597 case Op_Proj: { | |
598 // we are only interested in the oop result projection from a call | |
599 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() && | |
600 n->in(0)->as_Call()->returns_pointer()) { | |
601 add_local_var_and_edge(n, PointsToNode::NoEscape, n->in(0), NULL); | |
602 break; | |
603 } | |
604 ELSE_FAIL("Op_Proj"); | |
605 } | |
606 case Op_Rethrow: // Exception object escapes | |
607 case Op_Return: { | |
608 if (n->req() > TypeFunc::Parms && | |
609 _igvn->type(n->in(TypeFunc::Parms))->isa_oopptr()) { | |
610 // Treat Return value as LocalVar with GlobalEscape escape state. | |
611 add_local_var_and_edge(n, PointsToNode::GlobalEscape, | |
612 n->in(TypeFunc::Parms), NULL); | |
613 break; | |
614 } | |
615 ELSE_FAIL("Op_Return"); | |
616 } | |
617 case Op_StoreP: | |
618 case Op_StoreN: | |
619 case Op_StorePConditional: | |
620 case Op_CompareAndSwapP: | |
621 case Op_CompareAndSwapN: { | |
622 Node* adr = n->in(MemNode::Address); | |
623 const Type *adr_type = _igvn->type(adr); | |
624 adr_type = adr_type->make_ptr(); | |
625 if (adr_type->isa_oopptr() || | |
626 (opcode == Op_StoreP || opcode == Op_StoreN) && | |
627 (adr_type == TypeRawPtr::NOTNULL && | |
628 adr->in(AddPNode::Address)->is_Proj() && | |
629 adr->in(AddPNode::Address)->in(0)->is_Allocate())) { | |
630 // Point Address to Value | |
631 PointsToNode* adr_ptn = ptnode_adr(adr->_idx); | |
632 assert(adr_ptn != NULL && | |
633 adr_ptn->as_Field()->is_oop(), "node should be registered"); | |
634 Node *val = n->in(MemNode::ValueIn); | |
635 PointsToNode* ptn = ptnode_adr(val->_idx); | |
636 assert(ptn != NULL, "node should be registered"); | |
637 add_edge(adr_ptn, ptn); | |
638 break; | |
639 } | |
640 ELSE_FAIL("Op_StoreP"); | |
641 } | |
642 case Op_AryEq: | |
643 case Op_StrComp: | |
644 case Op_StrEquals: | |
645 case Op_StrIndexOf: { | |
646 // char[] arrays passed to string intrinsic do not escape but | |
647 // they are not scalar replaceable. Adjust escape state for them. | |
648 // Start from in(2) edge since in(1) is memory edge. | |
649 for (uint i = 2; i < n->req(); i++) { | |
650 Node* adr = n->in(i); | |
651 const Type* at = _igvn->type(adr); | |
652 if (!adr->is_top() && at->isa_ptr()) { | |
653 assert(at == Type::TOP || at == TypePtr::NULL_PTR || | |
654 at->isa_ptr() != NULL, "expecting a pointer"); | |
655 if (adr->is_AddP()) { | |
656 adr = get_addp_base(adr); | |
657 } | |
658 PointsToNode* ptn = ptnode_adr(adr->_idx); | |
659 assert(ptn != NULL, "node should be registered"); | |
660 add_edge(n_ptn, ptn); | |
661 } | |
662 } | |
663 break; | |
664 } | |
665 default: { | |
666 // This method should be called only for EA specific nodes which may | |
667 // miss some edges when they were created. | |
668 #ifdef ASSERT | |
669 n->dump(1); | |
670 #endif | |
671 guarantee(false, "unknown node"); | |
672 } | |
673 } | |
674 return; | |
675 } | |
676 | |
677 void ConnectionGraph::add_call_node(CallNode* call) { | |
678 assert(call->returns_pointer(), "only for call which returns pointer"); | |
679 uint call_idx = call->_idx; | |
680 if (call->is_Allocate()) { | |
681 Node* k = call->in(AllocateNode::KlassNode); | |
682 const TypeKlassPtr* kt = k->bottom_type()->isa_klassptr(); | |
683 assert(kt != NULL, "TypeKlassPtr required."); | |
684 ciKlass* cik = kt->klass(); | |
685 PointsToNode::EscapeState es = PointsToNode::NoEscape; | |
686 bool scalar_replaceable = true; | |
687 if (call->is_AllocateArray()) { | |
688 if (!cik->is_array_klass()) { // StressReflectiveCode | |
689 es = PointsToNode::GlobalEscape; | |
690 } else { | |
691 int length = call->in(AllocateNode::ALength)->find_int_con(-1); | |
692 if (length < 0 || length > EliminateAllocationArraySizeLimit) { | |
693 // Not scalar replaceable if the length is not constant or too big. | |
694 scalar_replaceable = false; | |
695 } | |
696 } | |
697 } else { // Allocate instance | |
698 if (cik->is_subclass_of(_compile->env()->Thread_klass()) || | |
699 !cik->is_instance_klass() || // StressReflectiveCode | |
700 cik->as_instance_klass()->has_finalizer()) { | |
701 es = PointsToNode::GlobalEscape; | |
702 } | |
703 } | |
704 add_java_object(call, es); | |
705 PointsToNode* ptn = ptnode_adr(call_idx); | |
706 if (!scalar_replaceable && ptn->scalar_replaceable()) { | |
707 ptn->set_scalar_replaceable(false); | |
708 } | |
709 } else if (call->is_CallStaticJava()) { | |
710 // Call nodes could be different types: | |
711 // | |
712 // 1. CallDynamicJavaNode (what happened during call is unknown): | |
713 // | |
714 // - mapped to GlobalEscape JavaObject node if oop is returned; | |
715 // | |
716 // - all oop arguments are escaping globally; | |
717 // | |
718 // 2. CallStaticJavaNode (execute bytecode analysis if possible): | |
719 // | |
720 // - the same as CallDynamicJavaNode if can't do bytecode analysis; | |
721 // | |
722 // - mapped to GlobalEscape JavaObject node if unknown oop is returned; | |
723 // - mapped to NoEscape JavaObject node if non-escaping object allocated | |
724 // during call is returned; | |
725 // - mapped to ArgEscape LocalVar node pointed to object arguments | |
726 // which are returned and does not escape during call; | |
727 // | |
728 // - oop arguments escaping status is defined by bytecode analysis; | |
729 // | |
730 // For a static call, we know exactly what method is being called. | |
731 // Use bytecode estimator to record whether the call's return value escapes. | |
732 ciMethod* meth = call->as_CallJava()->method(); | |
733 if (meth == NULL) { | |
734 const char* name = call->as_CallStaticJava()->_name; | |
735 assert(strncmp(name, "_multianewarray", 15) == 0, "TODO: add failed case check"); | |
736 // Returns a newly allocated unescaped object. | |
737 add_java_object(call, PointsToNode::NoEscape); | |
738 ptnode_adr(call_idx)->set_scalar_replaceable(false); | |
739 } else { | |
740 BCEscapeAnalyzer* call_analyzer = meth->get_bcea(); | |
741 call_analyzer->copy_dependencies(_compile->dependencies()); | |
742 if (call_analyzer->is_return_allocated()) { | |
743 // Returns a newly allocated unescaped object, simply | |
744 // update dependency information. | |
745 // Mark it as NoEscape so that objects referenced by | |
746 // it's fields will be marked as NoEscape at least. | |
747 add_java_object(call, PointsToNode::NoEscape); | |
748 ptnode_adr(call_idx)->set_scalar_replaceable(false); | |
749 } else { | |
750 // Determine whether any arguments are returned. | |
751 const TypeTuple* d = call->tf()->domain(); | |
752 bool ret_arg = false; | |
753 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
754 if (d->field_at(i)->isa_ptr() != NULL && | |
755 call_analyzer->is_arg_returned(i - TypeFunc::Parms)) { | |
756 ret_arg = true; | |
757 break; | |
758 } | |
759 } | |
760 if (ret_arg) { | |
761 add_local_var(call, PointsToNode::ArgEscape); | |
762 } else { | |
763 // Returns unknown object. | |
764 map_ideal_node(call, phantom_obj); | |
765 } | |
766 } | |
767 } | |
768 } else { | |
769 // An other type of call, assume the worst case: | |
770 // returned value is unknown and globally escapes. | |
771 assert(call->Opcode() == Op_CallDynamicJava, "add failed case check"); | |
772 map_ideal_node(call, phantom_obj); | |
773 } | |
774 } | |
775 | |
776 void ConnectionGraph::process_call_arguments(CallNode *call) { | |
777 bool is_arraycopy = false; | |
778 switch (call->Opcode()) { | |
779 #ifdef ASSERT | |
780 case Op_Allocate: | |
781 case Op_AllocateArray: | |
782 case Op_Lock: | |
783 case Op_Unlock: | |
784 assert(false, "should be done already"); | |
785 break; | |
786 #endif | |
787 case Op_CallLeafNoFP: | |
788 is_arraycopy = (call->as_CallLeaf()->_name != NULL && | |
789 strstr(call->as_CallLeaf()->_name, "arraycopy") != 0); | |
790 // fall through | |
791 case Op_CallLeaf: { | |
792 // Stub calls, objects do not escape but they are not scale replaceable. | |
793 // Adjust escape state for outgoing arguments. | |
794 const TypeTuple * d = call->tf()->domain(); | |
795 bool src_has_oops = false; | |
796 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
797 const Type* at = d->field_at(i); | |
798 Node *arg = call->in(i); | |
799 const Type *aat = _igvn->type(arg); | |
800 if (arg->is_top() || !at->isa_ptr() || !aat->isa_ptr()) | |
801 continue; | |
802 if (arg->is_AddP()) { | |
803 // | |
804 // The inline_native_clone() case when the arraycopy stub is called | |
805 // after the allocation before Initialize and CheckCastPP nodes. | |
806 // Or normal arraycopy for object arrays case. | |
807 // | |
808 // Set AddP's base (Allocate) as not scalar replaceable since | |
809 // pointer to the base (with offset) is passed as argument. | |
810 // | |
811 arg = get_addp_base(arg); | |
812 } | |
813 PointsToNode* arg_ptn = ptnode_adr(arg->_idx); | |
814 assert(arg_ptn != NULL, "should be registered"); | |
815 PointsToNode::EscapeState arg_esc = arg_ptn->escape_state(); | |
816 if (is_arraycopy || arg_esc < PointsToNode::ArgEscape) { | |
817 assert(aat == Type::TOP || aat == TypePtr::NULL_PTR || | |
818 aat->isa_ptr() != NULL, "expecting an Ptr"); | |
819 bool arg_has_oops = aat->isa_oopptr() && | |
820 (aat->isa_oopptr()->klass() == NULL || aat->isa_instptr() || | |
821 (aat->isa_aryptr() && aat->isa_aryptr()->klass()->is_obj_array_klass())); | |
822 if (i == TypeFunc::Parms) { | |
823 src_has_oops = arg_has_oops; | |
824 } | |
825 // | |
826 // src or dst could be j.l.Object when other is basic type array: | |
827 // | |
828 // arraycopy(char[],0,Object*,0,size); | |
829 // arraycopy(Object*,0,char[],0,size); | |
830 // | |
831 // Don't add edges in such cases. | |
832 // | |
833 bool arg_is_arraycopy_dest = src_has_oops && is_arraycopy && | |
834 arg_has_oops && (i > TypeFunc::Parms); | |
835 #ifdef ASSERT | |
836 if (!(is_arraycopy || | |
837 call->as_CallLeaf()->_name != NULL && | |
838 (strcmp(call->as_CallLeaf()->_name, "g1_wb_pre") == 0 || | |
839 strcmp(call->as_CallLeaf()->_name, "g1_wb_post") == 0 )) | |
840 ) { | |
841 call->dump(); | |
842 assert(false, "EA: unexpected CallLeaf"); | |
843 } | |
844 #endif | |
845 // Always process arraycopy's destination object since | |
846 // we need to add all possible edges to references in | |
847 // source object. | |
848 if (arg_esc >= PointsToNode::ArgEscape && | |
849 !arg_is_arraycopy_dest) { | |
850 continue; | |
851 } | |
852 set_escape_state(arg_ptn, PointsToNode::ArgEscape); | |
853 if (arg_is_arraycopy_dest) { | |
854 Node* src = call->in(TypeFunc::Parms); | |
855 if (src->is_AddP()) { | |
856 src = get_addp_base(src); | |
857 } | |
858 PointsToNode* src_ptn = ptnode_adr(src->_idx); | |
859 assert(src_ptn != NULL, "should be registered"); | |
860 if (arg_ptn != src_ptn) { | |
861 // Special arraycopy edge: | |
862 // A destination object's field can't have the source object | |
863 // as base since objects escape states are not related. | |
864 // Only escape state of destination object's fields affects | |
865 // escape state of fields in source object. | |
866 add_arraycopy(call, PointsToNode::ArgEscape, src_ptn, arg_ptn); | |
867 } | |
868 } | |
869 } | |
870 } | |
871 break; | |
872 } | |
873 case Op_CallStaticJava: { | |
874 // For a static call, we know exactly what method is being called. | |
875 // Use bytecode estimator to record the call's escape affects | |
876 #ifdef ASSERT | |
877 const char* name = call->as_CallStaticJava()->_name; | |
878 assert((name == NULL || strcmp(name, "uncommon_trap") != 0), "normal calls only"); | |
879 #endif | |
880 ciMethod* meth = call->as_CallJava()->method(); | |
881 BCEscapeAnalyzer* call_analyzer = (meth !=NULL) ? meth->get_bcea() : NULL; | |
882 // fall-through if not a Java method or no analyzer information | |
883 if (call_analyzer != NULL) { | |
884 PointsToNode* call_ptn = ptnode_adr(call->_idx); | |
885 const TypeTuple* d = call->tf()->domain(); | |
886 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
887 const Type* at = d->field_at(i); | |
888 int k = i - TypeFunc::Parms; | |
889 Node* arg = call->in(i); | |
890 PointsToNode* arg_ptn = ptnode_adr(arg->_idx); | |
891 if (at->isa_ptr() != NULL && | |
892 call_analyzer->is_arg_returned(k)) { | |
893 // The call returns arguments. | |
894 if (call_ptn != NULL) { // Is call's result used? | |
895 assert(call_ptn->is_LocalVar(), "node should be registered"); | |
896 assert(arg_ptn != NULL, "node should be registered"); | |
897 add_edge(call_ptn, arg_ptn); | |
898 } | |
899 } | |
900 if (at->isa_oopptr() != NULL && | |
901 arg_ptn->escape_state() < PointsToNode::GlobalEscape) { | |
902 if (!call_analyzer->is_arg_stack(k)) { | |
903 // The argument global escapes | |
904 set_escape_state(arg_ptn, PointsToNode::GlobalEscape); | |
905 } else { | |
906 set_escape_state(arg_ptn, PointsToNode::ArgEscape); | |
907 if (!call_analyzer->is_arg_local(k)) { | |
908 // The argument itself doesn't escape, but any fields might | |
909 set_fields_escape_state(arg_ptn, PointsToNode::GlobalEscape); | |
910 } | |
911 } | |
912 } | |
913 } | |
914 if (call_ptn != NULL && call_ptn->is_LocalVar()) { | |
915 // The call returns arguments. | |
916 assert(call_ptn->edge_count() > 0, "sanity"); | |
917 if (!call_analyzer->is_return_local()) { | |
918 // Returns also unknown object. | |
919 add_edge(call_ptn, phantom_obj); | |
920 } | |
921 } | |
922 break; | |
923 } | |
924 } | |
925 default: { | |
926 // Fall-through here if not a Java method or no analyzer information | |
927 // or some other type of call, assume the worst case: all arguments | |
928 // globally escape. | |
929 const TypeTuple* d = call->tf()->domain(); | |
930 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
931 const Type* at = d->field_at(i); | |
932 if (at->isa_oopptr() != NULL) { | |
933 Node* arg = call->in(i); | |
934 if (arg->is_AddP()) { | |
935 arg = get_addp_base(arg); | |
936 } | |
937 assert(ptnode_adr(arg->_idx) != NULL, "should be defined already"); | |
938 set_escape_state(ptnode_adr(arg->_idx), PointsToNode::GlobalEscape); | |
939 } | |
940 } | |
941 } | |
942 } | |
943 } | |
944 | |
945 | |
946 // Finish Graph construction. | |
947 bool ConnectionGraph::complete_connection_graph( | |
948 GrowableArray<PointsToNode*>& ptnodes_worklist, | |
949 GrowableArray<JavaObjectNode*>& non_escaped_worklist, | |
950 GrowableArray<JavaObjectNode*>& java_objects_worklist, | |
951 GrowableArray<FieldNode*>& oop_fields_worklist) { | |
952 // Normally only 1-3 passes needed to build Connection Graph depending | |
953 // on graph complexity. Observed 8 passes in jvm2008 compiler.compiler. | |
954 // Set limit to 20 to catch situation when something did go wrong and | |
955 // bailout Escape Analysis. | |
956 // Also limit build time to 30 sec (60 in debug VM). | |
957 #define CG_BUILD_ITER_LIMIT 20 | |
958 #ifdef ASSERT | |
959 #define CG_BUILD_TIME_LIMIT 60.0 | |
960 #else | |
961 #define CG_BUILD_TIME_LIMIT 30.0 | |
962 #endif | |
963 | |
964 // Propagate GlobalEscape and ArgEscape escape states and check that | |
965 // we still have non-escaping objects. The method pushs on _worklist | |
966 // Field nodes which reference phantom_object. | |
967 if (!find_non_escaped_objects(ptnodes_worklist, non_escaped_worklist)) { | |
968 return false; // Nothing to do. | |
969 } | |
970 // Now propagate references to all JavaObject nodes. | |
971 int java_objects_length = java_objects_worklist.length(); | |
972 elapsedTimer time; | |
973 int new_edges = 1; | |
974 int iterations = 0; | |
975 do { | |
976 while ((new_edges > 0) && | |
977 (iterations++ < CG_BUILD_ITER_LIMIT) && | |
978 (time.seconds() < CG_BUILD_TIME_LIMIT)) { | |
979 time.start(); | |
980 new_edges = 0; | |
981 // Propagate references to phantom_object for nodes pushed on _worklist | |
982 // by find_non_escaped_objects() and find_field_value(). | |
983 new_edges += add_java_object_edges(phantom_obj, false); | |
984 for (int next = 0; next < java_objects_length; ++next) { | |
985 JavaObjectNode* ptn = java_objects_worklist.at(next); | |
986 new_edges += add_java_object_edges(ptn, true); | |
987 } | |
988 if (new_edges > 0) { | |
989 // Update escape states on each iteration if graph was updated. | |
990 if (!find_non_escaped_objects(ptnodes_worklist, non_escaped_worklist)) { | |
991 return false; // Nothing to do. | |
992 } | |
993 } | |
994 time.stop(); | |
995 } | |
996 if ((iterations < CG_BUILD_ITER_LIMIT) && | |
997 (time.seconds() < CG_BUILD_TIME_LIMIT)) { | |
998 time.start(); | |
999 // Find fields which have unknown value. | |
1000 int fields_length = oop_fields_worklist.length(); | |
1001 for (int next = 0; next < fields_length; next++) { | |
1002 FieldNode* field = oop_fields_worklist.at(next); | |
1003 if (field->edge_count() == 0) { | |
1004 new_edges += find_field_value(field); | |
1005 // This code may added new edges to phantom_object. | |
1006 // Need an other cycle to propagate references to phantom_object. | |
1007 } | |
1008 } | |
1009 time.stop(); | |
1010 } else { | |
1011 new_edges = 0; // Bailout | |
1012 } | |
1013 } while (new_edges > 0); | |
1014 | |
1015 // Bailout if passed limits. | |
1016 if ((iterations >= CG_BUILD_ITER_LIMIT) || | |
1017 (time.seconds() >= CG_BUILD_TIME_LIMIT)) { | |
1018 Compile* C = _compile; | |
1019 if (C->log() != NULL) { | |
1020 C->log()->begin_elem("connectionGraph_bailout reason='reached "); | |
1021 C->log()->text("%s", (iterations >= CG_BUILD_ITER_LIMIT) ? "iterations" : "time"); | |
1022 C->log()->end_elem(" limit'"); | |
1023 } | |
1024 assert(false, err_msg("infinite EA connection graph build (%f sec, %d iterations) with %d nodes and worklist size %d", | |
1025 time.seconds(), iterations, nodes_size(), ptnodes_worklist.length())); | |
1026 // Possible infinite build_connection_graph loop, | |
1027 // bailout (no changes to ideal graph were made). | |
1028 return false; | |
1029 } | |
1030 #ifdef ASSERT | |
1031 if (Verbose && PrintEscapeAnalysis) { | |
1032 tty->print_cr("EA: %d iterations to build connection graph with %d nodes and worklist size %d", | |
1033 iterations, nodes_size(), ptnodes_worklist.length()); | |
1034 } | |
1035 #endif | |
1036 | |
1037 #undef CG_BUILD_ITER_LIMIT | |
1038 #undef CG_BUILD_TIME_LIMIT | |
1039 | |
1040 // Find fields initialized by NULL for non-escaping Allocations. | |
1041 int non_escaped_length = non_escaped_worklist.length(); | |
1042 for (int next = 0; next < non_escaped_length; next++) { | |
1043 JavaObjectNode* ptn = non_escaped_worklist.at(next); | |
1044 PointsToNode::EscapeState es = ptn->escape_state(); | |
1045 assert(es <= PointsToNode::ArgEscape, "sanity"); | |
1046 if (es == PointsToNode::NoEscape) { | |
1047 if (find_init_values(ptn, null_obj, _igvn) > 0) { | |
1048 // Adding references to NULL object does not change escape states | |
1049 // since it does not escape. Also no fields are added to NULL object. | |
1050 add_java_object_edges(null_obj, false); | |
1051 } | |
1052 } | |
1053 Node* n = ptn->ideal_node(); | |
1054 if (n->is_Allocate()) { | |
1055 // The object allocated by this Allocate node will never be | |
1056 // seen by an other thread. Mark it so that when it is | |
1057 // expanded no MemBarStoreStore is added. | |
1058 InitializeNode* ini = n->as_Allocate()->initialization(); | |
1059 if (ini != NULL) | |
1060 ini->set_does_not_escape(); | |
1061 } | |
1062 } | |
1063 return true; // Finished graph construction. | |
1064 } | |
1065 | |
1066 // Propagate GlobalEscape and ArgEscape escape states to all nodes | |
1067 // and check that we still have non-escaping java objects. | |
1068 bool ConnectionGraph::find_non_escaped_objects(GrowableArray<PointsToNode*>& ptnodes_worklist, | |
1069 GrowableArray<JavaObjectNode*>& non_escaped_worklist) { | |
1070 GrowableArray<PointsToNode*> escape_worklist; | |
1071 // First, put all nodes with GlobalEscape and ArgEscape states on worklist. | |
1072 int ptnodes_length = ptnodes_worklist.length(); | |
1073 for (int next = 0; next < ptnodes_length; ++next) { | |
1074 PointsToNode* ptn = ptnodes_worklist.at(next); | |
1075 if (ptn->escape_state() >= PointsToNode::ArgEscape || | |
1076 ptn->fields_escape_state() >= PointsToNode::ArgEscape) { | |
1077 escape_worklist.push(ptn); | |
1078 } | |
1079 } | |
1080 // Set escape states to referenced nodes (edges list). | |
1081 while (escape_worklist.length() > 0) { | |
1082 PointsToNode* ptn = escape_worklist.pop(); | |
1083 PointsToNode::EscapeState es = ptn->escape_state(); | |
1084 PointsToNode::EscapeState field_es = ptn->fields_escape_state(); | |
1085 if (ptn->is_Field() && ptn->as_Field()->is_oop() && | |
1086 es >= PointsToNode::ArgEscape) { | |
1087 // GlobalEscape or ArgEscape state of field means it has unknown value. | |
1088 if (add_edge(ptn, phantom_obj)) { | |
1089 // New edge was added | |
1090 add_field_uses_to_worklist(ptn->as_Field()); | |
1091 } | |
1092 } | |
1093 for (EdgeIterator i(ptn); i.has_next(); i.next()) { | |
1094 PointsToNode* e = i.get(); | |
1095 if (e->is_Arraycopy()) { | |
1096 assert(ptn->arraycopy_dst(), "sanity"); | |
1097 // Propagate only fields escape state through arraycopy edge. | |
1098 if (e->fields_escape_state() < field_es) { | |
1099 set_fields_escape_state(e, field_es); | |
1100 escape_worklist.push(e); | |
1101 } | |
1102 } else if (es >= field_es) { | |
1103 // fields_escape_state is also set to 'es' if it is less than 'es'. | |
1104 if (e->escape_state() < es) { | |
1105 set_escape_state(e, es); | |
1106 escape_worklist.push(e); | |
1107 } | |
1108 } else { | |
1109 // Propagate field escape state. | |
1110 bool es_changed = false; | |
1111 if (e->fields_escape_state() < field_es) { | |
1112 set_fields_escape_state(e, field_es); | |
1113 es_changed = true; | |
1114 } | |
1115 if ((e->escape_state() < field_es) && | |
1116 e->is_Field() && ptn->is_JavaObject() && | |
1117 e->as_Field()->is_oop()) { | |
1118 // Change escape state of referenced fileds. | |
1119 set_escape_state(e, field_es); | |
1120 es_changed = true;; | |
1121 } else if (e->escape_state() < es) { | |
1122 set_escape_state(e, es); | |
1123 es_changed = true;; | |
1124 } | |
1125 if (es_changed) { | |
1126 escape_worklist.push(e); | |
1127 } | |
1128 } | |
1129 } | |
1130 } | |
1131 // Remove escaped objects from non_escaped list. | |
1132 for (int next = non_escaped_worklist.length()-1; next >= 0 ; --next) { | |
1133 JavaObjectNode* ptn = non_escaped_worklist.at(next); | |
1134 if (ptn->escape_state() >= PointsToNode::GlobalEscape) { | |
1135 non_escaped_worklist.delete_at(next); | |
1136 } | |
1137 if (ptn->escape_state() == PointsToNode::NoEscape) { | |
1138 // Find fields in non-escaped allocations which have unknown value. | |
1139 find_init_values(ptn, phantom_obj, NULL); | |
1140 } | |
1141 } | |
1142 return (non_escaped_worklist.length() > 0); | |
1143 } | |
1144 | |
1145 // Add all references to JavaObject node by walking over all uses. | |
1146 int ConnectionGraph::add_java_object_edges(JavaObjectNode* jobj, bool populate_worklist) { | |
1147 int new_edges = 0; | |
1148 if (populate_worklist) { | |
1149 // Populate _worklist by uses of jobj's uses. | |
1150 for (UseIterator i(jobj); i.has_next(); i.next()) { | |
1151 PointsToNode* use = i.get(); | |
1152 if (use->is_Arraycopy()) | |
1153 continue; | |
1154 add_uses_to_worklist(use); | |
1155 if (use->is_Field() && use->as_Field()->is_oop()) { | |
1156 // Put on worklist all field's uses (loads) and | |
1157 // related field nodes (same base and offset). | |
1158 add_field_uses_to_worklist(use->as_Field()); | |
1159 } | |
1160 } | |
1161 } | |
1162 while(_worklist.length() > 0) { | |
1163 PointsToNode* use = _worklist.pop(); | |
1164 if (PointsToNode::is_base_use(use)) { | |
1165 // Add reference from jobj to field and from field to jobj (field's base). | |
1166 use = PointsToNode::get_use_node(use)->as_Field(); | |
1167 if (add_base(use->as_Field(), jobj)) { | |
1168 new_edges++; | |
1169 } | |
1170 continue; | |
1171 } | |
1172 assert(!use->is_JavaObject(), "sanity"); | |
1173 if (use->is_Arraycopy()) { | |
1174 if (jobj == null_obj) // NULL object does not have field edges | |
1175 continue; | |
1176 // Added edge from Arraycopy node to arraycopy's source java object | |
1177 if (add_edge(use, jobj)) { | |
1178 jobj->set_arraycopy_src(); | |
1179 new_edges++; | |
1180 } | |
1181 // and stop here. | |
1182 continue; | |
1183 } | |
1184 if (!add_edge(use, jobj)) | |
1185 continue; // No new edge added, there was such edge already. | |
1186 new_edges++; | |
1187 if (use->is_LocalVar()) { | |
1188 add_uses_to_worklist(use); | |
1189 if (use->arraycopy_dst()) { | |
1190 for (EdgeIterator i(use); i.has_next(); i.next()) { | |
1191 PointsToNode* e = i.get(); | |
1192 if (e->is_Arraycopy()) { | |
1193 if (jobj == null_obj) // NULL object does not have field edges | |
1194 continue; | |
1195 // Add edge from arraycopy's destination java object to Arraycopy node. | |
1196 if (add_edge(jobj, e)) { | |
1197 new_edges++; | |
1198 jobj->set_arraycopy_dst(); | |
1199 } | |
1200 } | |
1201 } | |
1202 } | |
1203 } else { | |
1204 // Added new edge to stored in field values. | |
1205 // Put on worklist all field's uses (loads) and | |
1206 // related field nodes (same base and offset). | |
1207 add_field_uses_to_worklist(use->as_Field()); | |
1208 } | |
1209 } | |
1210 return new_edges; | |
1211 } | |
1212 | |
1213 // Put on worklist all related field nodes. | |
1214 void ConnectionGraph::add_field_uses_to_worklist(FieldNode* field) { | |
1215 assert(field->is_oop(), "sanity"); | |
1216 int offset = field->offset(); | |
1217 add_uses_to_worklist(field); | |
1218 // Loop over all bases of this field and push on worklist Field nodes | |
1219 // with the same offset and base (since they may reference the same field). | |
1220 for (BaseIterator i(field); i.has_next(); i.next()) { | |
1221 PointsToNode* base = i.get(); | |
1222 add_fields_to_worklist(field, base); | |
1223 // Check if the base was source object of arraycopy and go over arraycopy's | |
1224 // destination objects since values stored to a field of source object are | |
1225 // accessable by uses (loads) of fields of destination objects. | |
1226 if (base->arraycopy_src()) { | |
1227 for (UseIterator j(base); j.has_next(); j.next()) { | |
1228 PointsToNode* arycp = j.get(); | |
1229 if (arycp->is_Arraycopy()) { | |
1230 for (UseIterator k(arycp); k.has_next(); k.next()) { | |
1231 PointsToNode* abase = k.get(); | |
1232 if (abase->arraycopy_dst() && abase != base) { | |
1233 // Look for the same arracopy reference. | |
1234 add_fields_to_worklist(field, abase); | |
1235 } | |
1236 } | |
1237 } | |
1238 } | |
1239 } | |
1240 } | |
1241 } | |
1242 | |
1243 // Put on worklist all related field nodes. | |
1244 void ConnectionGraph::add_fields_to_worklist(FieldNode* field, PointsToNode* base) { | |
1245 int offset = field->offset(); | |
1246 if (base->is_LocalVar()) { | |
1247 for (UseIterator j(base); j.has_next(); j.next()) { | |
1248 PointsToNode* f = j.get(); | |
1249 if (PointsToNode::is_base_use(f)) { // Field | |
1250 f = PointsToNode::get_use_node(f); | |
1251 if (f == field || !f->as_Field()->is_oop()) | |
1252 continue; | |
1253 int offs = f->as_Field()->offset(); | |
1254 if (offs == offset || offset == Type::OffsetBot || offs == Type::OffsetBot) { | |
1255 add_to_worklist(f); | |
1256 } | |
1257 } | |
1258 } | |
1259 } else { | |
1260 assert(base->is_JavaObject(), "sanity"); | |
1261 if (// Skip phantom_object since it is only used to indicate that | |
1262 // this field's content globally escapes. | |
1263 (base != phantom_obj) && | |
1264 // NULL object node does not have fields. | |
1265 (base != null_obj)) { | |
1266 for (EdgeIterator i(base); i.has_next(); i.next()) { | |
1267 PointsToNode* f = i.get(); | |
1268 // Skip arraycopy edge since store to destination object field | |
1269 // does not update value in source object field. | |
1270 if (f->is_Arraycopy()) { | |
1271 assert(base->arraycopy_dst(), "sanity"); | |
1272 continue; | |
1273 } | |
1274 if (f == field || !f->as_Field()->is_oop()) | |
1275 continue; | |
1276 int offs = f->as_Field()->offset(); | |
1277 if (offs == offset || offset == Type::OffsetBot || offs == Type::OffsetBot) { | |
1278 add_to_worklist(f); | |
1279 } | |
1280 } | |
1281 } | |
1282 } | |
1283 } | |
1284 | |
1285 // Find fields which have unknown value. | |
1286 int ConnectionGraph::find_field_value(FieldNode* field) { | |
1287 // Escaped fields should have init value already. | |
1288 assert(field->escape_state() == PointsToNode::NoEscape, "sanity"); | |
1289 int new_edges = 0; | |
1290 for (BaseIterator i(field); i.has_next(); i.next()) { | |
1291 PointsToNode* base = i.get(); | |
1292 if (base->is_JavaObject()) { | |
1293 // Skip Allocate's fields which will be processed later. | |
1294 if (base->ideal_node()->is_Allocate()) | |
1295 return 0; | |
1296 assert(base == null_obj, "only NULL ptr base expected here"); | |
1297 } | |
1298 } | |
1299 if (add_edge(field, phantom_obj)) { | |
1300 // New edge was added | |
1301 new_edges++; | |
1302 add_field_uses_to_worklist(field); | |
1303 } | |
1304 return new_edges; | |
1305 } | |
1306 | |
1307 // Find fields initializing values for allocations. | |
1308 int ConnectionGraph::find_init_values(JavaObjectNode* pta, PointsToNode* init_val, PhaseTransform* phase) { | |
1309 assert(pta->escape_state() == PointsToNode::NoEscape, "Not escaped Allocate nodes only"); | |
1310 int new_edges = 0; | |
1311 Node* alloc = pta->ideal_node(); | |
1312 if (init_val == phantom_obj) { | |
1313 // Do nothing for Allocate nodes since its fields values are "known". | |
1314 if (alloc->is_Allocate()) | |
1315 return 0; | |
1316 assert(alloc->as_CallStaticJava(), "sanity"); | |
1317 #ifdef ASSERT | |
1318 if (alloc->as_CallStaticJava()->method() == NULL) { | |
1319 const char* name = alloc->as_CallStaticJava()->_name; | |
1320 assert(strncmp(name, "_multianewarray", 15) == 0, "sanity"); | |
1321 } | |
1322 #endif | |
1323 // Non-escaped allocation returned from Java or runtime call have | |
1324 // unknown values in fields. | |
1325 for (EdgeIterator i(pta); i.has_next(); i.next()) { | |
1326 PointsToNode* ptn = i.get(); | |
1327 if (ptn->is_Field() && ptn->as_Field()->is_oop()) { | |
1328 if (add_edge(ptn, phantom_obj)) { | |
1329 // New edge was added | |
1330 new_edges++; | |
1331 add_field_uses_to_worklist(ptn->as_Field()); | |
1332 } | |
1333 } | |
1334 } | |
1335 return new_edges; | |
1336 } | |
1337 assert(init_val == null_obj, "sanity"); | |
1338 // Do nothing for Call nodes since its fields values are unknown. | |
1339 if (!alloc->is_Allocate()) | |
1340 return 0; | |
1341 | |
1342 InitializeNode* ini = alloc->as_Allocate()->initialization(); | |
1343 Compile* C = _compile; | |
1344 bool visited_bottom_offset = false; | |
1345 GrowableArray<int> offsets_worklist; | |
1346 | |
1347 // Check if an oop field's initializing value is recorded and add | |
1348 // a corresponding NULL if field's value if it is not recorded. | |
1349 // Connection Graph does not record a default initialization by NULL | |
1350 // captured by Initialize node. | |
1351 // | |
1352 for (EdgeIterator i(pta); i.has_next(); i.next()) { | |
1353 PointsToNode* ptn = i.get(); // Field (AddP) | |
1354 if (!ptn->is_Field() || !ptn->as_Field()->is_oop()) | |
1355 continue; // Not oop field | |
1356 int offset = ptn->as_Field()->offset(); | |
1357 if (offset == Type::OffsetBot) { | |
1358 if (!visited_bottom_offset) { | |
1359 // OffsetBot is used to reference array's element, | |
1360 // always add reference to NULL to all Field nodes since we don't | |
1361 // known which element is referenced. | |
1362 if (add_edge(ptn, null_obj)) { | |
1363 // New edge was added | |
1364 new_edges++; | |
1365 add_field_uses_to_worklist(ptn->as_Field()); | |
1366 visited_bottom_offset = true; | |
1367 } | |
1368 } | |
1369 } else { | |
1370 // Check only oop fields. | |
1371 const Type* adr_type = ptn->ideal_node()->as_AddP()->bottom_type(); | |
1372 if (adr_type->isa_rawptr()) { | |
1373 #ifdef ASSERT | |
1374 // Raw pointers are used for initializing stores so skip it | |
1375 // since it should be recorded already | |
1376 Node* base = get_addp_base(ptn->ideal_node()); | |
1377 assert(adr_type->isa_rawptr() && base->is_Proj() && | |
1378 (base->in(0) == alloc),"unexpected pointer type"); | |
1379 #endif | |
1380 continue; | |
1381 } | |
1382 if (!offsets_worklist.contains(offset)) { | |
1383 offsets_worklist.append(offset); | |
1384 Node* value = NULL; | |
1385 if (ini != NULL) { | |
1386 BasicType ft = UseCompressedOops ? T_NARROWOOP : T_OBJECT; | |
1387 Node* store = ini->find_captured_store(offset, type2aelembytes(ft), phase); | |
1388 if (store != NULL && store->is_Store()) { | |
1389 value = store->in(MemNode::ValueIn); | |
1390 } else { | |
1391 // There could be initializing stores which follow allocation. | |
1392 // For example, a volatile field store is not collected | |
1393 // by Initialize node. | |
1394 // | |
1395 // Need to check for dependent loads to separate such stores from | |
1396 // stores which follow loads. For now, add initial value NULL so | |
1397 // that compare pointers optimization works correctly. | |
1398 } | |
1399 } | |
1400 if (value == NULL) { | |
1401 // A field's initializing value was not recorded. Add NULL. | |
1402 if (add_edge(ptn, null_obj)) { | |
1403 // New edge was added | |
1404 new_edges++; | |
1405 add_field_uses_to_worklist(ptn->as_Field()); | |
1406 } | |
1407 } | |
1408 } | |
1409 } | |
1410 } | |
1411 return new_edges; | |
1412 } | |
1413 | |
1414 // Adjust scalar_replaceable state after Connection Graph is built. | |
1415 void ConnectionGraph::adjust_scalar_replaceable_state(JavaObjectNode* jobj) { | |
1416 // Search for non-escaping objects which are not scalar replaceable | |
1417 // and mark them to propagate the state to referenced objects. | |
1418 | |
1419 // 1. An object is not scalar replaceable if the field into which it is | |
1420 // stored has unknown offset (stored into unknown element of an array). | |
1421 // | |
1422 for (UseIterator i(jobj); i.has_next(); i.next()) { | |
1423 PointsToNode* use = i.get(); | |
1424 assert(!use->is_Arraycopy(), "sanity"); | |
1425 if (use->is_Field()) { | |
1426 FieldNode* field = use->as_Field(); | |
1427 assert(field->is_oop() && field->scalar_replaceable() && | |
1428 field->fields_escape_state() == PointsToNode::NoEscape, "sanity"); | |
1429 if (field->offset() == Type::OffsetBot) { | |
1430 jobj->set_scalar_replaceable(false); | |
1431 return; | |
1432 } | |
1433 } | |
1434 assert(use->is_Field() || use->is_LocalVar(), "sanity"); | |
1435 // 2. An object is not scalar replaceable if it is merged with other objects. | |
1436 for (EdgeIterator j(use); j.has_next(); j.next()) { | |
1437 PointsToNode* ptn = j.get(); | |
1438 if (ptn->is_JavaObject() && ptn != jobj) { | |
1439 // Mark all objects. | |
1440 jobj->set_scalar_replaceable(false); | |
1441 ptn->set_scalar_replaceable(false); | |
1442 } | |
1443 } | |
1444 if (!jobj->scalar_replaceable()) { | |
135 return; | 1445 return; |
1446 } | |
1447 } | |
1448 | |
1449 for (EdgeIterator j(jobj); j.has_next(); j.next()) { | |
1450 // Non-escaping object node should point only to field nodes. | |
1451 FieldNode* field = j.get()->as_Field(); | |
1452 int offset = field->as_Field()->offset(); | |
1453 | |
1454 // 3. An object is not scalar replaceable if it has a field with unknown | |
1455 // offset (array's element is accessed in loop). | |
1456 if (offset == Type::OffsetBot) { | |
1457 jobj->set_scalar_replaceable(false); | |
1458 return; | |
1459 } | |
1460 // 4. Currently an object is not scalar replaceable if a LoadStore node | |
1461 // access its field since the field value is unknown after it. | |
1462 // | |
1463 Node* n = field->ideal_node(); | |
1464 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1465 if (n->fast_out(i)->is_LoadStore()) { | |
1466 jobj->set_scalar_replaceable(false); | |
1467 return; | |
1468 } | |
1469 } | |
1470 | |
1471 // 5. Or the address may point to more then one object. This may produce | |
1472 // the false positive result (set not scalar replaceable) | |
1473 // since the flow-insensitive escape analysis can't separate | |
1474 // the case when stores overwrite the field's value from the case | |
1475 // when stores happened on different control branches. | |
1476 // | |
1477 // Note: it will disable scalar replacement in some cases: | |
1478 // | |
1479 // Point p[] = new Point[1]; | |
1480 // p[0] = new Point(); // Will be not scalar replaced | |
1481 // | |
1482 // but it will save us from incorrect optimizations in next cases: | |
1483 // | |
1484 // Point p[] = new Point[1]; | |
1485 // if ( x ) p[0] = new Point(); // Will be not scalar replaced | |
1486 // | |
1487 if (field->base_count() > 1) { | |
1488 for (BaseIterator i(field); i.has_next(); i.next()) { | |
1489 PointsToNode* base = i.get(); | |
1490 // Don't take into account LocalVar nodes which | |
1491 // may point to only one object which should be also | |
1492 // this field's base by now. | |
1493 if (base->is_JavaObject() && base != jobj) { | |
1494 // Mark all bases. | |
1495 jobj->set_scalar_replaceable(false); | |
1496 base->set_scalar_replaceable(false); | |
1497 } | |
1498 } | |
1499 } | |
1500 } | |
1501 } | |
1502 | |
1503 #ifdef ASSERT | |
1504 void ConnectionGraph::verify_connection_graph( | |
1505 GrowableArray<PointsToNode*>& ptnodes_worklist, | |
1506 GrowableArray<JavaObjectNode*>& non_escaped_worklist, | |
1507 GrowableArray<JavaObjectNode*>& java_objects_worklist, | |
1508 GrowableArray<Node*>& addp_worklist) { | |
1509 // Verify that graph is complete - no new edges could be added. | |
1510 int java_objects_length = java_objects_worklist.length(); | |
1511 int non_escaped_length = non_escaped_worklist.length(); | |
1512 int new_edges = 0; | |
1513 for (int next = 0; next < java_objects_length; ++next) { | |
1514 JavaObjectNode* ptn = java_objects_worklist.at(next); | |
1515 new_edges += add_java_object_edges(ptn, true); | |
1516 } | |
1517 assert(new_edges == 0, "graph was not complete"); | |
1518 // Verify that escape state is final. | |
1519 int length = non_escaped_worklist.length(); | |
1520 find_non_escaped_objects(ptnodes_worklist, non_escaped_worklist); | |
1521 assert((non_escaped_length == non_escaped_worklist.length()) && | |
1522 (non_escaped_length == length) && | |
1523 (_worklist.length() == 0), "escape state was not final"); | |
1524 | |
1525 // Verify fields information. | |
1526 int addp_length = addp_worklist.length(); | |
1527 for (int next = 0; next < addp_length; ++next ) { | |
1528 Node* n = addp_worklist.at(next); | |
1529 FieldNode* field = ptnode_adr(n->_idx)->as_Field(); | |
1530 if (field->is_oop()) { | |
1531 // Verify that field has all bases | |
1532 Node* base = get_addp_base(n); | |
1533 PointsToNode* ptn = ptnode_adr(base->_idx); | |
1534 if (ptn->is_JavaObject()) { | |
1535 assert(field->has_base(ptn->as_JavaObject()), "sanity"); | |
1536 } else { | |
1537 assert(ptn->is_LocalVar(), "sanity"); | |
1538 for (EdgeIterator i(ptn); i.has_next(); i.next()) { | |
1539 PointsToNode* e = i.get(); | |
1540 if (e->is_JavaObject()) { | |
1541 assert(field->has_base(e->as_JavaObject()), "sanity"); | |
1542 } | |
1543 } | |
1544 } | |
1545 // Verify that all fields have initializing values. | |
1546 if (field->edge_count() == 0) { | |
1547 field->dump(); | |
1548 assert(field->edge_count() > 0, "sanity"); | |
1549 } | |
1550 } | |
1551 } | |
1552 } | |
1553 #endif | |
1554 | |
1555 // Optimize ideal graph. | |
1556 void ConnectionGraph::optimize_ideal_graph(GrowableArray<Node*>& ptr_cmp_worklist, | |
1557 GrowableArray<Node*>& storestore_worklist) { | |
1558 Compile* C = _compile; | |
1559 PhaseIterGVN* igvn = _igvn; | |
1560 if (EliminateLocks) { | |
1561 // Mark locks before changing ideal graph. | |
1562 int cnt = C->macro_count(); | |
1563 for( int i=0; i < cnt; i++ ) { | |
1564 Node *n = C->macro_node(i); | |
1565 if (n->is_AbstractLock()) { // Lock and Unlock nodes | |
1566 AbstractLockNode* alock = n->as_AbstractLock(); | |
1567 if (!alock->is_non_esc_obj()) { | |
1568 if (not_global_escape(alock->obj_node())) { | |
1569 assert(!alock->is_eliminated() || alock->is_coarsened(), "sanity"); | |
1570 // The lock could be marked eliminated by lock coarsening | |
1571 // code during first IGVN before EA. Replace coarsened flag | |
1572 // to eliminate all associated locks/unlocks. | |
1573 alock->set_non_esc_obj(); | |
1574 } | |
1575 } | |
1576 } | |
1577 } | |
1578 } | |
1579 | |
1580 if (OptimizePtrCompare) { | |
1581 // Add ConI(#CC_GT) and ConI(#CC_EQ). | |
1582 _pcmp_neq = igvn->makecon(TypeInt::CC_GT); | |
1583 _pcmp_eq = igvn->makecon(TypeInt::CC_EQ); | |
1584 // Optimize objects compare. | |
1585 while (ptr_cmp_worklist.length() != 0) { | |
1586 Node *n = ptr_cmp_worklist.pop(); | |
1587 Node *res = optimize_ptr_compare(n); | |
1588 if (res != NULL) { | |
1589 #ifndef PRODUCT | |
1590 if (PrintOptimizePtrCompare) { | |
1591 tty->print_cr("++++ Replaced: %d %s(%d,%d) --> %s", n->_idx, (n->Opcode() == Op_CmpP ? "CmpP" : "CmpN"), n->in(1)->_idx, n->in(2)->_idx, (res == _pcmp_eq ? "EQ" : "NotEQ")); | |
1592 if (Verbose) { | |
1593 n->dump(1); | |
1594 } | |
1595 } | |
1596 #endif | |
1597 igvn->replace_node(n, res); | |
1598 } | |
1599 } | |
1600 // cleanup | |
1601 if (_pcmp_neq->outcnt() == 0) | |
1602 igvn->hash_delete(_pcmp_neq); | |
1603 if (_pcmp_eq->outcnt() == 0) | |
1604 igvn->hash_delete(_pcmp_eq); | |
1605 } | |
1606 | |
1607 // For MemBarStoreStore nodes added in library_call.cpp, check | |
1608 // escape status of associated AllocateNode and optimize out | |
1609 // MemBarStoreStore node if the allocated object never escapes. | |
1610 while (storestore_worklist.length() != 0) { | |
1611 Node *n = storestore_worklist.pop(); | |
1612 MemBarStoreStoreNode *storestore = n ->as_MemBarStoreStore(); | |
1613 Node *alloc = storestore->in(MemBarNode::Precedent)->in(0); | |
1614 assert (alloc->is_Allocate(), "storestore should point to AllocateNode"); | |
1615 if (not_global_escape(alloc)) { | |
1616 MemBarNode* mb = MemBarNode::make(C, Op_MemBarCPUOrder, Compile::AliasIdxBot); | |
1617 mb->init_req(TypeFunc::Memory, storestore->in(TypeFunc::Memory)); | |
1618 mb->init_req(TypeFunc::Control, storestore->in(TypeFunc::Control)); | |
1619 igvn->register_new_node_with_optimizer(mb); | |
1620 igvn->replace_node(storestore, mb); | |
1621 } | |
1622 } | |
1623 } | |
1624 | |
1625 // Optimize objects compare. | |
1626 Node* ConnectionGraph::optimize_ptr_compare(Node* n) { | |
1627 assert(OptimizePtrCompare, "sanity"); | |
1628 PointsToNode* ptn1 = ptnode_adr(n->in(1)->_idx); | |
1629 PointsToNode* ptn2 = ptnode_adr(n->in(2)->_idx); | |
1630 JavaObjectNode* jobj1 = unique_java_object(n->in(1)); | |
1631 JavaObjectNode* jobj2 = unique_java_object(n->in(2)); | |
1632 assert(ptn1->is_JavaObject() || ptn1->is_LocalVar(), "sanity"); | |
1633 assert(ptn2->is_JavaObject() || ptn2->is_LocalVar(), "sanity"); | |
1634 | |
1635 // Check simple cases first. | |
1636 if (jobj1 != NULL) { | |
1637 if (jobj1->escape_state() == PointsToNode::NoEscape) { | |
1638 if (jobj1 == jobj2) { | |
1639 // Comparing the same not escaping object. | |
1640 return _pcmp_eq; | |
1641 } | |
1642 Node* obj = jobj1->ideal_node(); | |
1643 // Comparing not escaping allocation. | |
1644 if ((obj->is_Allocate() || obj->is_CallStaticJava()) && | |
1645 !ptn2->points_to(jobj1)) { | |
1646 return _pcmp_neq; // This includes nullness check. | |
1647 } | |
1648 } | |
1649 } | |
1650 if (jobj2 != NULL) { | |
1651 if (jobj2->escape_state() == PointsToNode::NoEscape) { | |
1652 Node* obj = jobj2->ideal_node(); | |
1653 // Comparing not escaping allocation. | |
1654 if ((obj->is_Allocate() || obj->is_CallStaticJava()) && | |
1655 !ptn1->points_to(jobj2)) { | |
1656 return _pcmp_neq; // This includes nullness check. | |
1657 } | |
1658 } | |
1659 } | |
1660 if (jobj1 != NULL && jobj1 != phantom_obj && | |
1661 jobj2 != NULL && jobj2 != phantom_obj && | |
1662 jobj1->ideal_node()->is_Con() && | |
1663 jobj2->ideal_node()->is_Con()) { | |
1664 // Klass or String constants compare. Need to be careful with | |
1665 // compressed pointers - compare types of ConN and ConP instead of nodes. | |
1666 const Type* t1 = jobj1->ideal_node()->bottom_type()->make_ptr(); | |
1667 const Type* t2 = jobj2->ideal_node()->bottom_type()->make_ptr(); | |
1668 assert(t1 != NULL && t2 != NULL, "sanity"); | |
1669 if (t1->make_ptr() == t2->make_ptr()) { | |
1670 return _pcmp_eq; | |
136 } else { | 1671 } else { |
137 f->set_has_unknown_ptr(); | 1672 return _pcmp_neq; |
138 } | 1673 } |
139 } | 1674 } |
140 add_edge(f, to_i, PointsToNode::PointsToEdge); | 1675 if (ptn1->meet(ptn2)) { |
141 } | 1676 return NULL; // Sets are not disjoint |
142 | 1677 } |
143 void ConnectionGraph::add_deferred_edge(uint from_i, uint to_i) { | 1678 |
144 PointsToNode *f = ptnode_adr(from_i); | 1679 // Sets are disjoint. |
145 PointsToNode *t = ptnode_adr(to_i); | 1680 bool set1_has_unknown_ptr = ptn1->points_to(phantom_obj); |
146 | 1681 bool set2_has_unknown_ptr = ptn2->points_to(phantom_obj); |
147 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | 1682 bool set1_has_null_ptr = ptn1->points_to(null_obj); |
148 assert(f->node_type() == PointsToNode::LocalVar || f->node_type() == PointsToNode::Field, "invalid source of Deferred edge"); | 1683 bool set2_has_null_ptr = ptn2->points_to(null_obj); |
149 assert(t->node_type() == PointsToNode::LocalVar || t->node_type() == PointsToNode::Field, "invalid destination of Deferred edge"); | 1684 if (set1_has_unknown_ptr && set2_has_null_ptr || |
150 // don't add a self-referential edge, this can occur during removal of | 1685 set2_has_unknown_ptr && set1_has_null_ptr) { |
151 // deferred edges | 1686 // Check nullness of unknown object. |
152 if (from_i != to_i) | 1687 return NULL; |
153 add_edge(f, to_i, PointsToNode::DeferredEdge); | 1688 } |
154 } | 1689 |
1690 // Disjointness by itself is not sufficient since | |
1691 // alias analysis is not complete for escaped objects. | |
1692 // Disjoint sets are definitely unrelated only when | |
1693 // at least one set has only not escaping allocations. | |
1694 if (!set1_has_unknown_ptr && !set1_has_null_ptr) { | |
1695 if (ptn1->non_escaping_allocation()) { | |
1696 return _pcmp_neq; | |
1697 } | |
1698 } | |
1699 if (!set2_has_unknown_ptr && !set2_has_null_ptr) { | |
1700 if (ptn2->non_escaping_allocation()) { | |
1701 return _pcmp_neq; | |
1702 } | |
1703 } | |
1704 return NULL; | |
1705 } | |
1706 | |
1707 // Connection Graph constuction functions. | |
1708 | |
1709 void ConnectionGraph::add_local_var(Node *n, PointsToNode::EscapeState es) { | |
1710 PointsToNode* ptadr = _nodes.at(n->_idx); | |
1711 if (ptadr != NULL) { | |
1712 assert(ptadr->is_LocalVar() && ptadr->ideal_node() == n, "sanity"); | |
1713 return; | |
1714 } | |
1715 Compile* C = _compile; | |
1716 ptadr = new (C->comp_arena()) LocalVarNode(C, n, es); | |
1717 _nodes.at_put(n->_idx, ptadr); | |
1718 } | |
1719 | |
1720 void ConnectionGraph::add_java_object(Node *n, PointsToNode::EscapeState es) { | |
1721 PointsToNode* ptadr = _nodes.at(n->_idx); | |
1722 if (ptadr != NULL) { | |
1723 assert(ptadr->is_JavaObject() && ptadr->ideal_node() == n, "sanity"); | |
1724 return; | |
1725 } | |
1726 Compile* C = _compile; | |
1727 ptadr = new (C->comp_arena()) JavaObjectNode(C, n, es); | |
1728 _nodes.at_put(n->_idx, ptadr); | |
1729 } | |
1730 | |
1731 void ConnectionGraph::add_field(Node *n, PointsToNode::EscapeState es, int offset) { | |
1732 PointsToNode* ptadr = _nodes.at(n->_idx); | |
1733 if (ptadr != NULL) { | |
1734 assert(ptadr->is_Field() && ptadr->ideal_node() == n, "sanity"); | |
1735 return; | |
1736 } | |
1737 Compile* C = _compile; | |
1738 bool is_oop = is_oop_field(n, offset); | |
1739 FieldNode* field = new (C->comp_arena()) FieldNode(C, n, es, offset, is_oop); | |
1740 _nodes.at_put(n->_idx, field); | |
1741 } | |
1742 | |
1743 void ConnectionGraph::add_arraycopy(Node *n, PointsToNode::EscapeState es, | |
1744 PointsToNode* src, PointsToNode* dst) { | |
1745 assert(!src->is_Field() && !dst->is_Field(), "only for JavaObject and LocalVar"); | |
1746 assert((src != null_obj) && (dst != null_obj), "not for ConP NULL"); | |
1747 PointsToNode* ptadr = _nodes.at(n->_idx); | |
1748 if (ptadr != NULL) { | |
1749 assert(ptadr->is_Arraycopy() && ptadr->ideal_node() == n, "sanity"); | |
1750 return; | |
1751 } | |
1752 Compile* C = _compile; | |
1753 ptadr = new (C->comp_arena()) ArraycopyNode(C, n, es); | |
1754 _nodes.at_put(n->_idx, ptadr); | |
1755 // Add edge from arraycopy node to source object. | |
1756 (void)add_edge(ptadr, src); | |
1757 src->set_arraycopy_src(); | |
1758 // Add edge from destination object to arraycopy node. | |
1759 (void)add_edge(dst, ptadr); | |
1760 dst->set_arraycopy_dst(); | |
1761 } | |
1762 | |
1763 bool ConnectionGraph::is_oop_field(Node* n, int offset) { | |
1764 const Type* adr_type = n->as_AddP()->bottom_type(); | |
1765 BasicType bt = T_INT; | |
1766 if (offset == Type::OffsetBot) { | |
1767 // Check only oop fields. | |
1768 if (!adr_type->isa_aryptr() || | |
1769 (adr_type->isa_aryptr()->klass() == NULL) || | |
1770 adr_type->isa_aryptr()->klass()->is_obj_array_klass()) { | |
1771 // OffsetBot is used to reference array's element. Ignore first AddP. | |
1772 if (find_second_addp(n, n->in(AddPNode::Base)) == NULL) { | |
1773 bt = T_OBJECT; | |
1774 } | |
1775 } | |
1776 } else if (offset != oopDesc::klass_offset_in_bytes()) { | |
1777 if (adr_type->isa_instptr()) { | |
1778 ciField* field = _compile->alias_type(adr_type->isa_instptr())->field(); | |
1779 if (field != NULL) { | |
1780 bt = field->layout_type(); | |
1781 } else { | |
1782 // Ignore non field load (for example, klass load) | |
1783 } | |
1784 } else if (adr_type->isa_aryptr()) { | |
1785 if (offset == arrayOopDesc::length_offset_in_bytes()) { | |
1786 // Ignore array length load. | |
1787 } else if (find_second_addp(n, n->in(AddPNode::Base)) != NULL) { | |
1788 // Ignore first AddP. | |
1789 } else { | |
1790 const Type* elemtype = adr_type->isa_aryptr()->elem(); | |
1791 bt = elemtype->array_element_basic_type(); | |
1792 } | |
1793 } else if (adr_type->isa_rawptr() || adr_type->isa_klassptr()) { | |
1794 // Allocation initialization, ThreadLocal field access, unsafe access | |
1795 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1796 int opcode = n->fast_out(i)->Opcode(); | |
1797 if (opcode == Op_StoreP || opcode == Op_LoadP || | |
1798 opcode == Op_StoreN || opcode == Op_LoadN) { | |
1799 bt = T_OBJECT; | |
1800 } | |
1801 } | |
1802 } | |
1803 } | |
1804 return (bt == T_OBJECT || bt == T_NARROWOOP || bt == T_ARRAY); | |
1805 } | |
1806 | |
1807 // Returns unique pointed java object or NULL. | |
1808 JavaObjectNode* ConnectionGraph::unique_java_object(Node *n) { | |
1809 assert(!_collecting, "should not call when contructed graph"); | |
1810 // If the node was created after the escape computation we can't answer. | |
1811 uint idx = n->_idx; | |
1812 if (idx >= nodes_size()) { | |
1813 return NULL; | |
1814 } | |
1815 PointsToNode* ptn = ptnode_adr(idx); | |
1816 if (ptn->is_JavaObject()) { | |
1817 return ptn->as_JavaObject(); | |
1818 } | |
1819 assert(ptn->is_LocalVar(), "sanity"); | |
1820 // Check all java objects it points to. | |
1821 JavaObjectNode* jobj = NULL; | |
1822 for (EdgeIterator i(ptn); i.has_next(); i.next()) { | |
1823 PointsToNode* e = i.get(); | |
1824 if (e->is_JavaObject()) { | |
1825 if (jobj == NULL) { | |
1826 jobj = e->as_JavaObject(); | |
1827 } else if (jobj != e) { | |
1828 return NULL; | |
1829 } | |
1830 } | |
1831 } | |
1832 return jobj; | |
1833 } | |
1834 | |
1835 // Return true if this node points only to non-escaping allocations. | |
1836 bool PointsToNode::non_escaping_allocation() { | |
1837 if (is_JavaObject()) { | |
1838 Node* n = ideal_node(); | |
1839 if (n->is_Allocate() || n->is_CallStaticJava()) { | |
1840 return (escape_state() == PointsToNode::NoEscape); | |
1841 } else { | |
1842 return false; | |
1843 } | |
1844 } | |
1845 assert(is_LocalVar(), "sanity"); | |
1846 // Check all java objects it points to. | |
1847 for (EdgeIterator i(this); i.has_next(); i.next()) { | |
1848 PointsToNode* e = i.get(); | |
1849 if (e->is_JavaObject()) { | |
1850 Node* n = e->ideal_node(); | |
1851 if ((e->escape_state() != PointsToNode::NoEscape) || | |
1852 !(n->is_Allocate() || n->is_CallStaticJava())) { | |
1853 return false; | |
1854 } | |
1855 } | |
1856 } | |
1857 return true; | |
1858 } | |
1859 | |
1860 // Return true if we know the node does not escape globally. | |
1861 bool ConnectionGraph::not_global_escape(Node *n) { | |
1862 assert(!_collecting, "should not call during graph construction"); | |
1863 // If the node was created after the escape computation we can't answer. | |
1864 uint idx = n->_idx; | |
1865 if (idx >= nodes_size()) { | |
1866 return false; | |
1867 } | |
1868 PointsToNode* ptn = ptnode_adr(idx); | |
1869 PointsToNode::EscapeState es = ptn->escape_state(); | |
1870 // If we have already computed a value, return it. | |
1871 if (es >= PointsToNode::GlobalEscape) | |
1872 return false; | |
1873 if (ptn->is_JavaObject()) { | |
1874 return true; // (es < PointsToNode::GlobalEscape); | |
1875 } | |
1876 assert(ptn->is_LocalVar(), "sanity"); | |
1877 // Check all java objects it points to. | |
1878 for (EdgeIterator i(ptn); i.has_next(); i.next()) { | |
1879 if (i.get()->escape_state() >= PointsToNode::GlobalEscape) | |
1880 return false; | |
1881 } | |
1882 return true; | |
1883 } | |
1884 | |
1885 | |
1886 // Helper functions | |
1887 | |
1888 // Return true if this node points to specified node or nodes it points to. | |
1889 bool PointsToNode::points_to(JavaObjectNode* ptn) const { | |
1890 if (is_JavaObject()) { | |
1891 return (this == ptn); | |
1892 } | |
1893 assert(is_LocalVar(), "sanity"); | |
1894 for (EdgeIterator i(this); i.has_next(); i.next()) { | |
1895 if (i.get() == ptn) | |
1896 return true; | |
1897 } | |
1898 return false; | |
1899 } | |
1900 | |
1901 // Return true if one node points to an other. | |
1902 bool PointsToNode::meet(PointsToNode* ptn) { | |
1903 if (this == ptn) { | |
1904 return true; | |
1905 } else if (ptn->is_JavaObject()) { | |
1906 return this->points_to(ptn->as_JavaObject()); | |
1907 } else if (this->is_JavaObject()) { | |
1908 return ptn->points_to(this->as_JavaObject()); | |
1909 } | |
1910 assert(this->is_LocalVar() && ptn->is_LocalVar(), "sanity"); | |
1911 int ptn_count = ptn->edge_count(); | |
1912 for (EdgeIterator i(this); i.has_next(); i.next()) { | |
1913 PointsToNode* this_e = i.get(); | |
1914 for (int j = 0; j < ptn_count; j++) { | |
1915 if (this_e == ptn->edge(j)) | |
1916 return true; | |
1917 } | |
1918 } | |
1919 return false; | |
1920 } | |
1921 | |
1922 #ifdef ASSERT | |
1923 // Return true if bases point to this java object. | |
1924 bool FieldNode::has_base(JavaObjectNode* jobj) const { | |
1925 for (BaseIterator i(this); i.has_next(); i.next()) { | |
1926 if (i.get() == jobj) | |
1927 return true; | |
1928 } | |
1929 return false; | |
1930 } | |
1931 #endif | |
155 | 1932 |
156 int ConnectionGraph::address_offset(Node* adr, PhaseTransform *phase) { | 1933 int ConnectionGraph::address_offset(Node* adr, PhaseTransform *phase) { |
157 const Type *adr_type = phase->type(adr); | 1934 const Type *adr_type = phase->type(adr); |
158 if (adr->is_AddP() && adr_type->isa_oopptr() == NULL && | 1935 if (adr->is_AddP() && adr_type->isa_oopptr() == NULL && |
159 adr->in(AddPNode::Address)->is_Proj() && | 1936 adr->in(AddPNode::Address)->is_Proj() && |
169 const TypePtr *t_ptr = adr_type->isa_ptr(); | 1946 const TypePtr *t_ptr = adr_type->isa_ptr(); |
170 assert(t_ptr != NULL, "must be a pointer type"); | 1947 assert(t_ptr != NULL, "must be a pointer type"); |
171 return t_ptr->offset(); | 1948 return t_ptr->offset(); |
172 } | 1949 } |
173 | 1950 |
174 void ConnectionGraph::add_field_edge(uint from_i, uint to_i, int offset) { | 1951 Node* ConnectionGraph::get_addp_base(Node *addp) { |
175 // Don't add fields to NULL pointer. | |
176 if (is_null_ptr(from_i)) | |
177 return; | |
178 PointsToNode *f = ptnode_adr(from_i); | |
179 PointsToNode *t = ptnode_adr(to_i); | |
180 | |
181 assert(f->node_type() != PointsToNode::UnknownType && t->node_type() != PointsToNode::UnknownType, "node types must be set"); | |
182 assert(f->node_type() == PointsToNode::JavaObject, "invalid destination of Field edge"); | |
183 assert(t->node_type() == PointsToNode::Field, "invalid destination of Field edge"); | |
184 assert (t->offset() == -1 || t->offset() == offset, "conflicting field offsets"); | |
185 t->set_offset(offset); | |
186 | |
187 add_edge(f, to_i, PointsToNode::FieldEdge); | |
188 } | |
189 | |
190 void ConnectionGraph::set_escape_state(uint ni, PointsToNode::EscapeState es) { | |
191 // Don't change non-escaping state of NULL pointer. | |
192 if (is_null_ptr(ni)) | |
193 return; | |
194 PointsToNode *npt = ptnode_adr(ni); | |
195 PointsToNode::EscapeState old_es = npt->escape_state(); | |
196 if (es > old_es) | |
197 npt->set_escape_state(es); | |
198 } | |
199 | |
200 void ConnectionGraph::add_node(Node *n, PointsToNode::NodeType nt, | |
201 PointsToNode::EscapeState es, bool done) { | |
202 PointsToNode* ptadr = ptnode_adr(n->_idx); | |
203 ptadr->_node = n; | |
204 ptadr->set_node_type(nt); | |
205 | |
206 // inline set_escape_state(idx, es); | |
207 PointsToNode::EscapeState old_es = ptadr->escape_state(); | |
208 if (es > old_es) | |
209 ptadr->set_escape_state(es); | |
210 | |
211 if (done) | |
212 _processed.set(n->_idx); | |
213 } | |
214 | |
215 PointsToNode::EscapeState ConnectionGraph::escape_state(Node *n) { | |
216 uint idx = n->_idx; | |
217 PointsToNode::EscapeState es; | |
218 | |
219 // If we are still collecting or there were no non-escaping allocations | |
220 // we don't know the answer yet | |
221 if (_collecting) | |
222 return PointsToNode::UnknownEscape; | |
223 | |
224 // if the node was created after the escape computation, return | |
225 // UnknownEscape | |
226 if (idx >= nodes_size()) | |
227 return PointsToNode::UnknownEscape; | |
228 | |
229 es = ptnode_adr(idx)->escape_state(); | |
230 | |
231 // if we have already computed a value, return it | |
232 if (es != PointsToNode::UnknownEscape && | |
233 ptnode_adr(idx)->node_type() == PointsToNode::JavaObject) | |
234 return es; | |
235 | |
236 // PointsTo() calls n->uncast() which can return a new ideal node. | |
237 if (n->uncast()->_idx >= nodes_size()) | |
238 return PointsToNode::UnknownEscape; | |
239 | |
240 PointsToNode::EscapeState orig_es = es; | |
241 | |
242 // compute max escape state of anything this node could point to | |
243 for(VectorSetI i(PointsTo(n)); i.test() && es != PointsToNode::GlobalEscape; ++i) { | |
244 uint pt = i.elem; | |
245 PointsToNode::EscapeState pes = ptnode_adr(pt)->escape_state(); | |
246 if (pes > es) | |
247 es = pes; | |
248 } | |
249 if (orig_es != es) { | |
250 // cache the computed escape state | |
251 assert(es > orig_es, "should have computed an escape state"); | |
252 set_escape_state(idx, es); | |
253 } // orig_es could be PointsToNode::UnknownEscape | |
254 return es; | |
255 } | |
256 | |
257 VectorSet* ConnectionGraph::PointsTo(Node * n) { | |
258 pt_ptset.Reset(); | |
259 pt_visited.Reset(); | |
260 pt_worklist.clear(); | |
261 | |
262 #ifdef ASSERT | |
263 Node *orig_n = n; | |
264 #endif | |
265 | |
266 n = n->uncast(); | |
267 PointsToNode* npt = ptnode_adr(n->_idx); | |
268 | |
269 // If we have a JavaObject, return just that object | |
270 if (npt->node_type() == PointsToNode::JavaObject) { | |
271 pt_ptset.set(n->_idx); | |
272 return &pt_ptset; | |
273 } | |
274 #ifdef ASSERT | |
275 if (npt->_node == NULL) { | |
276 if (orig_n != n) | |
277 orig_n->dump(); | |
278 n->dump(); | |
279 assert(npt->_node != NULL, "unregistered node"); | |
280 } | |
281 #endif | |
282 pt_worklist.push(n->_idx); | |
283 while(pt_worklist.length() > 0) { | |
284 int ni = pt_worklist.pop(); | |
285 if (pt_visited.test_set(ni)) | |
286 continue; | |
287 | |
288 PointsToNode* pn = ptnode_adr(ni); | |
289 // ensure that all inputs of a Phi have been processed | |
290 assert(!_collecting || !pn->_node->is_Phi() || _processed.test(ni),""); | |
291 | |
292 int edges_processed = 0; | |
293 uint e_cnt = pn->edge_count(); | |
294 for (uint e = 0; e < e_cnt; e++) { | |
295 uint etgt = pn->edge_target(e); | |
296 PointsToNode::EdgeType et = pn->edge_type(e); | |
297 if (et == PointsToNode::PointsToEdge) { | |
298 pt_ptset.set(etgt); | |
299 edges_processed++; | |
300 } else if (et == PointsToNode::DeferredEdge) { | |
301 pt_worklist.push(etgt); | |
302 edges_processed++; | |
303 } else { | |
304 assert(false,"neither PointsToEdge or DeferredEdge"); | |
305 } | |
306 } | |
307 if (edges_processed == 0) { | |
308 // no deferred or pointsto edges found. Assume the value was set | |
309 // outside this method. Add the phantom object to the pointsto set. | |
310 pt_ptset.set(_phantom_object); | |
311 } | |
312 } | |
313 return &pt_ptset; | |
314 } | |
315 | |
316 void ConnectionGraph::remove_deferred(uint ni, GrowableArray<uint>* deferred_edges, VectorSet* visited) { | |
317 // This method is most expensive during ConnectionGraph construction. | |
318 // Reuse vectorSet and an additional growable array for deferred edges. | |
319 deferred_edges->clear(); | |
320 visited->Reset(); | |
321 | |
322 visited->set(ni); | |
323 PointsToNode *ptn = ptnode_adr(ni); | |
324 assert(ptn->node_type() == PointsToNode::LocalVar || | |
325 ptn->node_type() == PointsToNode::Field, "sanity"); | |
326 assert(ptn->edge_count() != 0, "should have at least phantom_object"); | |
327 | |
328 // Mark current edges as visited and move deferred edges to separate array. | |
329 for (uint i = 0; i < ptn->edge_count(); ) { | |
330 uint t = ptn->edge_target(i); | |
331 #ifdef ASSERT | |
332 assert(!visited->test_set(t), "expecting no duplications"); | |
333 #else | |
334 visited->set(t); | |
335 #endif | |
336 if (ptn->edge_type(i) == PointsToNode::DeferredEdge) { | |
337 ptn->remove_edge(t, PointsToNode::DeferredEdge); | |
338 deferred_edges->append(t); | |
339 } else { | |
340 i++; | |
341 } | |
342 } | |
343 for (int next = 0; next < deferred_edges->length(); ++next) { | |
344 uint t = deferred_edges->at(next); | |
345 PointsToNode *ptt = ptnode_adr(t); | |
346 uint e_cnt = ptt->edge_count(); | |
347 assert(e_cnt != 0, "should have at least phantom_object"); | |
348 for (uint e = 0; e < e_cnt; e++) { | |
349 uint etgt = ptt->edge_target(e); | |
350 if (visited->test_set(etgt)) | |
351 continue; | |
352 | |
353 PointsToNode::EdgeType et = ptt->edge_type(e); | |
354 if (et == PointsToNode::PointsToEdge) { | |
355 add_pointsto_edge(ni, etgt); | |
356 } else if (et == PointsToNode::DeferredEdge) { | |
357 deferred_edges->append(etgt); | |
358 } else { | |
359 assert(false,"invalid connection graph"); | |
360 } | |
361 } | |
362 } | |
363 if (ptn->edge_count() == 0) { | |
364 // No pointsto edges found after deferred edges are removed. | |
365 // For example, in the next case where call is replaced | |
366 // with uncommon trap and as result array's load references | |
367 // itself through deferred edges: | |
368 // | |
369 // A a = b[i]; | |
370 // if (c!=null) a = c.foo(); | |
371 // b[i] = a; | |
372 // | |
373 // Assume the value was set outside this method and | |
374 // add edge to phantom object. | |
375 add_pointsto_edge(ni, _phantom_object); | |
376 } | |
377 } | |
378 | |
379 | |
380 // Add an edge to node given by "to_i" from any field of adr_i whose offset | |
381 // matches "offset" A deferred edge is added if to_i is a LocalVar, and | |
382 // a pointsto edge is added if it is a JavaObject | |
383 | |
384 void ConnectionGraph::add_edge_from_fields(uint adr_i, uint to_i, int offs) { | |
385 // No fields for NULL pointer. | |
386 if (is_null_ptr(adr_i)) { | |
387 return; | |
388 } | |
389 PointsToNode* an = ptnode_adr(adr_i); | |
390 PointsToNode* to = ptnode_adr(to_i); | |
391 bool deferred = (to->node_type() == PointsToNode::LocalVar); | |
392 bool escaped = (to_i == _phantom_object) && (offs == Type::OffsetTop); | |
393 if (escaped) { | |
394 // Values in fields escaped during call. | |
395 assert(an->escape_state() >= PointsToNode::ArgEscape, "sanity"); | |
396 offs = Type::OffsetBot; | |
397 } | |
398 for (uint fe = 0; fe < an->edge_count(); fe++) { | |
399 assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); | |
400 int fi = an->edge_target(fe); | |
401 if (escaped) { | |
402 set_escape_state(fi, PointsToNode::GlobalEscape); | |
403 } | |
404 PointsToNode* pf = ptnode_adr(fi); | |
405 int po = pf->offset(); | |
406 if (po == offs || po == Type::OffsetBot || offs == Type::OffsetBot) { | |
407 if (deferred) | |
408 add_deferred_edge(fi, to_i); | |
409 else | |
410 add_pointsto_edge(fi, to_i); | |
411 } | |
412 } | |
413 } | |
414 | |
415 // Add a deferred edge from node given by "from_i" to any field of adr_i | |
416 // whose offset matches "offset". | |
417 void ConnectionGraph::add_deferred_edge_to_fields(uint from_i, uint adr_i, int offs) { | |
418 // No fields for NULL pointer. | |
419 if (is_null_ptr(adr_i)) { | |
420 return; | |
421 } | |
422 if (adr_i == _phantom_object) { | |
423 // Add only one edge for unknown object. | |
424 add_pointsto_edge(from_i, _phantom_object); | |
425 return; | |
426 } | |
427 PointsToNode* an = ptnode_adr(adr_i); | |
428 bool is_alloc = an->_node->is_Allocate(); | |
429 for (uint fe = 0; fe < an->edge_count(); fe++) { | |
430 assert(an->edge_type(fe) == PointsToNode::FieldEdge, "expecting a field edge"); | |
431 int fi = an->edge_target(fe); | |
432 PointsToNode* pf = ptnode_adr(fi); | |
433 int offset = pf->offset(); | |
434 if (!is_alloc) { | |
435 // Assume the field was set outside this method if it is not Allocation | |
436 add_pointsto_edge(fi, _phantom_object); | |
437 } | |
438 if (offset == offs || offset == Type::OffsetBot || offs == Type::OffsetBot) { | |
439 add_deferred_edge(from_i, fi); | |
440 } | |
441 } | |
442 // Some fields references (AddP) may still be missing | |
443 // until Connection Graph construction is complete. | |
444 // For example, loads from RAW pointers with offset 0 | |
445 // which don't have AddP. | |
446 // A reference to phantom_object will be added if | |
447 // a field reference is still missing after completing | |
448 // Connection Graph (see remove_deferred()). | |
449 } | |
450 | |
451 // Helper functions | |
452 | |
453 static Node* get_addp_base(Node *addp) { | |
454 assert(addp->is_AddP(), "must be AddP"); | 1952 assert(addp->is_AddP(), "must be AddP"); |
455 // | 1953 // |
456 // AddP cases for Base and Address inputs: | 1954 // AddP cases for Base and Address inputs: |
457 // case #1. Direct object's field reference: | 1955 // case #1. Direct object's field reference: |
458 // Allocate | 1956 // Allocate |
511 // | | 2009 // | |
512 // DecodeN | 2010 // DecodeN |
513 // | | | 2011 // | | |
514 // AddP ( base == address ) | 2012 // AddP ( base == address ) |
515 // | 2013 // |
516 Node *base = addp->in(AddPNode::Base)->uncast(); | 2014 Node *base = addp->in(AddPNode::Base); |
517 if (base->is_top()) { // The AddP case #3 and #6. | 2015 if (base->uncast()->is_top()) { // The AddP case #3 and #6. |
518 base = addp->in(AddPNode::Address)->uncast(); | 2016 base = addp->in(AddPNode::Address); |
519 while (base->is_AddP()) { | 2017 while (base->is_AddP()) { |
520 // Case #6 (unsafe access) may have several chained AddP nodes. | 2018 // Case #6 (unsafe access) may have several chained AddP nodes. |
521 assert(base->in(AddPNode::Base)->is_top(), "expected unsafe access address only"); | 2019 assert(base->in(AddPNode::Base)->uncast()->is_top(), "expected unsafe access address only"); |
522 base = base->in(AddPNode::Address)->uncast(); | 2020 base = base->in(AddPNode::Address); |
523 } | 2021 } |
524 assert(base->Opcode() == Op_ConP || base->Opcode() == Op_ThreadLocal || | 2022 Node* uncast_base = base->uncast(); |
525 base->Opcode() == Op_CastX2P || base->is_DecodeN() || | 2023 int opcode = uncast_base->Opcode(); |
526 (base->is_Mem() && base->bottom_type() == TypeRawPtr::NOTNULL) || | 2024 assert(opcode == Op_ConP || opcode == Op_ThreadLocal || |
527 (base->is_Proj() && base->in(0)->is_Allocate()), "sanity"); | 2025 opcode == Op_CastX2P || uncast_base->is_DecodeN() || |
2026 (uncast_base->is_Mem() && uncast_base->bottom_type() == TypeRawPtr::NOTNULL) || | |
2027 (uncast_base->is_Proj() && uncast_base->in(0)->is_Allocate()), "sanity"); | |
528 } | 2028 } |
529 return base; | 2029 return base; |
530 } | 2030 } |
531 | 2031 |
532 static Node* find_second_addp(Node* addp, Node* n) { | 2032 Node* ConnectionGraph::find_second_addp(Node* addp, Node* n) { |
533 assert(addp->is_AddP() && addp->outcnt() > 0, "Don't process dead nodes"); | 2033 assert(addp->is_AddP() && addp->outcnt() > 0, "Don't process dead nodes"); |
534 | |
535 Node* addp2 = addp->raw_out(0); | 2034 Node* addp2 = addp->raw_out(0); |
536 if (addp->outcnt() == 1 && addp2->is_AddP() && | 2035 if (addp->outcnt() == 1 && addp2->is_AddP() && |
537 addp2->in(AddPNode::Base) == n && | 2036 addp2->in(AddPNode::Base) == n && |
538 addp2->in(AddPNode::Address) == addp) { | 2037 addp2->in(AddPNode::Address) == addp) { |
539 | |
540 assert(addp->in(AddPNode::Base) == n, "expecting the same base"); | 2038 assert(addp->in(AddPNode::Base) == n, "expecting the same base"); |
541 // | 2039 // |
542 // Find array's offset to push it on worklist first and | 2040 // Find array's offset to push it on worklist first and |
543 // as result process an array's element offset first (pushed second) | 2041 // as result process an array's element offset first (pushed second) |
544 // to avoid CastPP for the array's offset. | 2042 // to avoid CastPP for the array's offset. |
573 | 2071 |
574 // | 2072 // |
575 // Adjust the type and inputs of an AddP which computes the | 2073 // Adjust the type and inputs of an AddP which computes the |
576 // address of a field of an instance | 2074 // address of a field of an instance |
577 // | 2075 // |
578 bool ConnectionGraph::split_AddP(Node *addp, Node *base, PhaseGVN *igvn) { | 2076 bool ConnectionGraph::split_AddP(Node *addp, Node *base) { |
2077 PhaseGVN* igvn = _igvn; | |
579 const TypeOopPtr *base_t = igvn->type(base)->isa_oopptr(); | 2078 const TypeOopPtr *base_t = igvn->type(base)->isa_oopptr(); |
580 assert(base_t != NULL && base_t->is_known_instance(), "expecting instance oopptr"); | 2079 assert(base_t != NULL && base_t->is_known_instance(), "expecting instance oopptr"); |
581 const TypeOopPtr *t = igvn->type(addp)->isa_oopptr(); | 2080 const TypeOopPtr *t = igvn->type(addp)->isa_oopptr(); |
582 if (t == NULL) { | 2081 if (t == NULL) { |
583 // We are computing a raw address for a store captured by an Initialize | 2082 // We are computing a raw address for a store captured by an Initialize |
610 // | 2109 // |
611 if (!t->is_known_instance() && | 2110 if (!t->is_known_instance() && |
612 !base_t->klass()->is_subtype_of(t->klass())) { | 2111 !base_t->klass()->is_subtype_of(t->klass())) { |
613 return false; // bail out | 2112 return false; // bail out |
614 } | 2113 } |
615 | |
616 const TypeOopPtr *tinst = base_t->add_offset(t->offset())->is_oopptr(); | 2114 const TypeOopPtr *tinst = base_t->add_offset(t->offset())->is_oopptr(); |
617 // Do NOT remove the next line: ensure a new alias index is allocated | 2115 // Do NOT remove the next line: ensure a new alias index is allocated |
618 // for the instance type. Note: C++ will not remove it since the call | 2116 // for the instance type. Note: C++ will not remove it since the call |
619 // has side effect. | 2117 // has side effect. |
620 int alias_idx = _compile->get_alias_index(tinst); | 2118 int alias_idx = _compile->get_alias_index(tinst); |
621 igvn->set_type(addp, tinst); | 2119 igvn->set_type(addp, tinst); |
622 // record the allocation in the node map | 2120 // record the allocation in the node map |
623 assert(ptnode_adr(addp->_idx)->_node != NULL, "should be registered"); | 2121 set_map(addp, get_map(base->_idx)); |
624 set_map(addp->_idx, get_map(base->_idx)); | |
625 | |
626 // Set addp's Base and Address to 'base'. | 2122 // Set addp's Base and Address to 'base'. |
627 Node *abase = addp->in(AddPNode::Base); | 2123 Node *abase = addp->in(AddPNode::Base); |
628 Node *adr = addp->in(AddPNode::Address); | 2124 Node *adr = addp->in(AddPNode::Address); |
629 if (adr->is_Proj() && adr->in(0)->is_Allocate() && | 2125 if (adr->is_Proj() && adr->in(0)->is_Allocate() && |
630 adr->in(0)->_idx == (uint)inst_id) { | 2126 adr->in(0)->_idx == (uint)inst_id) { |
655 // | 2151 // |
656 // Create a new version of orig_phi if necessary. Returns either the newly | 2152 // Create a new version of orig_phi if necessary. Returns either the newly |
657 // created phi or an existing phi. Sets create_new to indicate whether a new | 2153 // created phi or an existing phi. Sets create_new to indicate whether a new |
658 // phi was created. Cache the last newly created phi in the node map. | 2154 // phi was created. Cache the last newly created phi in the node map. |
659 // | 2155 // |
660 PhiNode *ConnectionGraph::create_split_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn, bool &new_created) { | 2156 PhiNode *ConnectionGraph::create_split_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, bool &new_created) { |
661 Compile *C = _compile; | 2157 Compile *C = _compile; |
2158 PhaseGVN* igvn = _igvn; | |
662 new_created = false; | 2159 new_created = false; |
663 int phi_alias_idx = C->get_alias_index(orig_phi->adr_type()); | 2160 int phi_alias_idx = C->get_alias_index(orig_phi->adr_type()); |
664 // nothing to do if orig_phi is bottom memory or matches alias_idx | 2161 // nothing to do if orig_phi is bottom memory or matches alias_idx |
665 if (phi_alias_idx == alias_idx) { | 2162 if (phi_alias_idx == alias_idx) { |
666 return orig_phi; | 2163 return orig_phi; |
696 const TypePtr *atype = C->get_adr_type(alias_idx); | 2193 const TypePtr *atype = C->get_adr_type(alias_idx); |
697 result = PhiNode::make(orig_phi->in(0), NULL, Type::MEMORY, atype); | 2194 result = PhiNode::make(orig_phi->in(0), NULL, Type::MEMORY, atype); |
698 C->copy_node_notes_to(result, orig_phi); | 2195 C->copy_node_notes_to(result, orig_phi); |
699 igvn->set_type(result, result->bottom_type()); | 2196 igvn->set_type(result, result->bottom_type()); |
700 record_for_optimizer(result); | 2197 record_for_optimizer(result); |
701 | 2198 set_map(orig_phi, result); |
702 debug_only(Node* pn = ptnode_adr(orig_phi->_idx)->_node;) | |
703 assert(pn == NULL || pn == orig_phi, "wrong node"); | |
704 set_map(orig_phi->_idx, result); | |
705 ptnode_adr(orig_phi->_idx)->_node = orig_phi; | |
706 | |
707 new_created = true; | 2199 new_created = true; |
708 return result; | 2200 return result; |
709 } | 2201 } |
710 | 2202 |
711 // | 2203 // |
712 // Return a new version of Memory Phi "orig_phi" with the inputs having the | 2204 // Return a new version of Memory Phi "orig_phi" with the inputs having the |
713 // specified alias index. | 2205 // specified alias index. |
714 // | 2206 // |
715 PhiNode *ConnectionGraph::split_memory_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist, PhaseGVN *igvn) { | 2207 PhiNode *ConnectionGraph::split_memory_phi(PhiNode *orig_phi, int alias_idx, GrowableArray<PhiNode *> &orig_phi_worklist) { |
716 | |
717 assert(alias_idx != Compile::AliasIdxBot, "can't split out bottom memory"); | 2208 assert(alias_idx != Compile::AliasIdxBot, "can't split out bottom memory"); |
718 Compile *C = _compile; | 2209 Compile *C = _compile; |
2210 PhaseGVN* igvn = _igvn; | |
719 bool new_phi_created; | 2211 bool new_phi_created; |
720 PhiNode *result = create_split_phi(orig_phi, alias_idx, orig_phi_worklist, igvn, new_phi_created); | 2212 PhiNode *result = create_split_phi(orig_phi, alias_idx, orig_phi_worklist, new_phi_created); |
721 if (!new_phi_created) { | 2213 if (!new_phi_created) { |
722 return result; | 2214 return result; |
723 } | 2215 } |
724 | |
725 GrowableArray<PhiNode *> phi_list; | 2216 GrowableArray<PhiNode *> phi_list; |
726 GrowableArray<uint> cur_input; | 2217 GrowableArray<uint> cur_input; |
727 | |
728 PhiNode *phi = orig_phi; | 2218 PhiNode *phi = orig_phi; |
729 uint idx = 1; | 2219 uint idx = 1; |
730 bool finished = false; | 2220 bool finished = false; |
731 while(!finished) { | 2221 while(!finished) { |
732 while (idx < phi->req()) { | 2222 while (idx < phi->req()) { |
733 Node *mem = find_inst_mem(phi->in(idx), alias_idx, orig_phi_worklist, igvn); | 2223 Node *mem = find_inst_mem(phi->in(idx), alias_idx, orig_phi_worklist); |
734 if (mem != NULL && mem->is_Phi()) { | 2224 if (mem != NULL && mem->is_Phi()) { |
735 PhiNode *newphi = create_split_phi(mem->as_Phi(), alias_idx, orig_phi_worklist, igvn, new_phi_created); | 2225 PhiNode *newphi = create_split_phi(mem->as_Phi(), alias_idx, orig_phi_worklist, new_phi_created); |
736 if (new_phi_created) { | 2226 if (new_phi_created) { |
737 // found an phi for which we created a new split, push current one on worklist and begin | 2227 // found an phi for which we created a new split, push current one on worklist and begin |
738 // processing new one | 2228 // processing new one |
739 phi_list.push(phi); | 2229 phi_list.push(phi); |
740 cur_input.push(idx); | 2230 cur_input.push(idx); |
773 } | 2263 } |
774 } | 2264 } |
775 return result; | 2265 return result; |
776 } | 2266 } |
777 | 2267 |
778 | |
779 // | 2268 // |
780 // The next methods are derived from methods in MemNode. | 2269 // The next methods are derived from methods in MemNode. |
781 // | 2270 // |
782 static Node *step_through_mergemem(MergeMemNode *mmem, int alias_idx, const TypeOopPtr *toop) { | 2271 Node* ConnectionGraph::step_through_mergemem(MergeMemNode *mmem, int alias_idx, const TypeOopPtr *toop) { |
783 Node *mem = mmem; | 2272 Node *mem = mmem; |
784 // TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally | 2273 // TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally |
785 // means an array I have not precisely typed yet. Do not do any | 2274 // means an array I have not precisely typed yet. Do not do any |
786 // alias stuff with it any time soon. | 2275 // alias stuff with it any time soon. |
787 if( toop->base() != Type::AnyPtr && | 2276 if (toop->base() != Type::AnyPtr && |
788 !(toop->klass() != NULL && | 2277 !(toop->klass() != NULL && |
789 toop->klass()->is_java_lang_Object() && | 2278 toop->klass()->is_java_lang_Object() && |
790 toop->offset() == Type::OffsetBot) ) { | 2279 toop->offset() == Type::OffsetBot)) { |
791 mem = mmem->memory_at(alias_idx); | 2280 mem = mmem->memory_at(alias_idx); |
792 // Update input if it is progress over what we have now | 2281 // Update input if it is progress over what we have now |
793 } | 2282 } |
794 return mem; | 2283 return mem; |
795 } | 2284 } |
796 | 2285 |
797 // | 2286 // |
798 // Move memory users to their memory slices. | 2287 // Move memory users to their memory slices. |
799 // | 2288 // |
800 void ConnectionGraph::move_inst_mem(Node* n, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *igvn) { | 2289 void ConnectionGraph::move_inst_mem(Node* n, GrowableArray<PhiNode *> &orig_phis) { |
801 Compile* C = _compile; | 2290 Compile* C = _compile; |
802 | 2291 PhaseGVN* igvn = _igvn; |
803 const TypePtr* tp = igvn->type(n->in(MemNode::Address))->isa_ptr(); | 2292 const TypePtr* tp = igvn->type(n->in(MemNode::Address))->isa_ptr(); |
804 assert(tp != NULL, "ptr type"); | 2293 assert(tp != NULL, "ptr type"); |
805 int alias_idx = C->get_alias_index(tp); | 2294 int alias_idx = C->get_alias_index(tp); |
806 int general_idx = C->get_general_index(alias_idx); | 2295 int general_idx = C->get_general_index(alias_idx); |
807 | 2296 |
814 if (n != mmem->memory_at(general_idx) || alias_idx == general_idx) { | 2303 if (n != mmem->memory_at(general_idx) || alias_idx == general_idx) { |
815 continue; // Nothing to do | 2304 continue; // Nothing to do |
816 } | 2305 } |
817 // Replace previous general reference to mem node. | 2306 // Replace previous general reference to mem node. |
818 uint orig_uniq = C->unique(); | 2307 uint orig_uniq = C->unique(); |
819 Node* m = find_inst_mem(n, general_idx, orig_phis, igvn); | 2308 Node* m = find_inst_mem(n, general_idx, orig_phis); |
820 assert(orig_uniq == C->unique(), "no new nodes"); | 2309 assert(orig_uniq == C->unique(), "no new nodes"); |
821 mmem->set_memory_at(general_idx, m); | 2310 mmem->set_memory_at(general_idx, m); |
822 --imax; | 2311 --imax; |
823 --i; | 2312 --i; |
824 } else if (use->is_MemBar()) { | 2313 } else if (use->is_MemBar()) { |
834 alias_idx == general_idx) { | 2323 alias_idx == general_idx) { |
835 continue; // Nothing to do | 2324 continue; // Nothing to do |
836 } | 2325 } |
837 // Move to general memory slice. | 2326 // Move to general memory slice. |
838 uint orig_uniq = C->unique(); | 2327 uint orig_uniq = C->unique(); |
839 Node* m = find_inst_mem(n, general_idx, orig_phis, igvn); | 2328 Node* m = find_inst_mem(n, general_idx, orig_phis); |
840 assert(orig_uniq == C->unique(), "no new nodes"); | 2329 assert(orig_uniq == C->unique(), "no new nodes"); |
841 igvn->hash_delete(use); | 2330 igvn->hash_delete(use); |
842 imax -= use->replace_edge(n, m); | 2331 imax -= use->replace_edge(n, m); |
843 igvn->hash_insert(use); | 2332 igvn->hash_insert(use); |
844 record_for_optimizer(use); | 2333 record_for_optimizer(use); |
871 | 2360 |
872 // | 2361 // |
873 // Search memory chain of "mem" to find a MemNode whose address | 2362 // Search memory chain of "mem" to find a MemNode whose address |
874 // is the specified alias index. | 2363 // is the specified alias index. |
875 // | 2364 // |
876 Node* ConnectionGraph::find_inst_mem(Node *orig_mem, int alias_idx, GrowableArray<PhiNode *> &orig_phis, PhaseGVN *phase) { | 2365 Node* ConnectionGraph::find_inst_mem(Node *orig_mem, int alias_idx, GrowableArray<PhiNode *> &orig_phis) { |
877 if (orig_mem == NULL) | 2366 if (orig_mem == NULL) |
878 return orig_mem; | 2367 return orig_mem; |
879 Compile* C = phase->C; | 2368 Compile* C = _compile; |
2369 PhaseGVN* igvn = _igvn; | |
880 const TypeOopPtr *toop = C->get_adr_type(alias_idx)->isa_oopptr(); | 2370 const TypeOopPtr *toop = C->get_adr_type(alias_idx)->isa_oopptr(); |
881 bool is_instance = (toop != NULL) && toop->is_known_instance(); | 2371 bool is_instance = (toop != NULL) && toop->is_known_instance(); |
882 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); | 2372 Node *start_mem = C->start()->proj_out(TypeFunc::Memory); |
883 Node *prev = NULL; | 2373 Node *prev = NULL; |
884 Node *result = orig_mem; | 2374 Node *result = orig_mem; |
885 while (prev != result) { | 2375 while (prev != result) { |
886 prev = result; | 2376 prev = result; |
887 if (result == start_mem) | 2377 if (result == start_mem) |
888 break; // hit one of our sentinels | 2378 break; // hit one of our sentinels |
889 if (result->is_Mem()) { | 2379 if (result->is_Mem()) { |
890 const Type *at = phase->type(result->in(MemNode::Address)); | 2380 const Type *at = igvn->type(result->in(MemNode::Address)); |
891 if (at == Type::TOP) | 2381 if (at == Type::TOP) |
892 break; // Dead | 2382 break; // Dead |
893 assert (at->isa_ptr() != NULL, "pointer type required."); | 2383 assert (at->isa_ptr() != NULL, "pointer type required."); |
894 int idx = C->get_alias_index(at->is_ptr()); | 2384 int idx = C->get_alias_index(at->is_ptr()); |
895 if (idx == alias_idx) | 2385 if (idx == alias_idx) |
907 Node *proj_in = result->in(0); | 2397 Node *proj_in = result->in(0); |
908 if (proj_in->is_Allocate() && proj_in->_idx == (uint)toop->instance_id()) { | 2398 if (proj_in->is_Allocate() && proj_in->_idx == (uint)toop->instance_id()) { |
909 break; // hit one of our sentinels | 2399 break; // hit one of our sentinels |
910 } else if (proj_in->is_Call()) { | 2400 } else if (proj_in->is_Call()) { |
911 CallNode *call = proj_in->as_Call(); | 2401 CallNode *call = proj_in->as_Call(); |
912 if (!call->may_modify(toop, phase)) { | 2402 if (!call->may_modify(toop, igvn)) { |
913 result = call->in(TypeFunc::Memory); | 2403 result = call->in(TypeFunc::Memory); |
914 } | 2404 } |
915 } else if (proj_in->is_Initialize()) { | 2405 } else if (proj_in->is_Initialize()) { |
916 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); | 2406 AllocateNode* alloc = proj_in->as_Initialize()->allocation(); |
917 // Stop if this is the initialization for the object instance which | 2407 // Stop if this is the initialization for the object instance which |
926 MergeMemNode *mmem = result->as_MergeMem(); | 2416 MergeMemNode *mmem = result->as_MergeMem(); |
927 result = step_through_mergemem(mmem, alias_idx, toop); | 2417 result = step_through_mergemem(mmem, alias_idx, toop); |
928 if (result == mmem->base_memory()) { | 2418 if (result == mmem->base_memory()) { |
929 // Didn't find instance memory, search through general slice recursively. | 2419 // Didn't find instance memory, search through general slice recursively. |
930 result = mmem->memory_at(C->get_general_index(alias_idx)); | 2420 result = mmem->memory_at(C->get_general_index(alias_idx)); |
931 result = find_inst_mem(result, alias_idx, orig_phis, phase); | 2421 result = find_inst_mem(result, alias_idx, orig_phis); |
932 if (C->failing()) { | 2422 if (C->failing()) { |
933 return NULL; | 2423 return NULL; |
934 } | 2424 } |
935 mmem->set_memory_at(alias_idx, result); | 2425 mmem->set_memory_at(alias_idx, result); |
936 } | 2426 } |
937 } else if (result->is_Phi() && | 2427 } else if (result->is_Phi() && |
938 C->get_alias_index(result->as_Phi()->adr_type()) != alias_idx) { | 2428 C->get_alias_index(result->as_Phi()->adr_type()) != alias_idx) { |
939 Node *un = result->as_Phi()->unique_input(phase); | 2429 Node *un = result->as_Phi()->unique_input(igvn); |
940 if (un != NULL) { | 2430 if (un != NULL) { |
941 orig_phis.append_if_missing(result->as_Phi()); | 2431 orig_phis.append_if_missing(result->as_Phi()); |
942 result = un; | 2432 result = un; |
943 } else { | 2433 } else { |
944 break; | 2434 break; |
945 } | 2435 } |
946 } else if (result->is_ClearArray()) { | 2436 } else if (result->is_ClearArray()) { |
947 if (!ClearArrayNode::step_through(&result, (uint)toop->instance_id(), phase)) { | 2437 if (!ClearArrayNode::step_through(&result, (uint)toop->instance_id(), igvn)) { |
948 // Can not bypass initialization of the instance | 2438 // Can not bypass initialization of the instance |
949 // we are looking for. | 2439 // we are looking for. |
950 break; | 2440 break; |
951 } | 2441 } |
952 // Otherwise skip it (the call updated 'result' value). | 2442 // Otherwise skip it (the call updated 'result' value). |
953 } else if (result->Opcode() == Op_SCMemProj) { | 2443 } else if (result->Opcode() == Op_SCMemProj) { |
954 assert(result->in(0)->is_LoadStore(), "sanity"); | 2444 assert(result->in(0)->is_LoadStore(), "sanity"); |
955 const Type *at = phase->type(result->in(0)->in(MemNode::Address)); | 2445 const Type *at = igvn->type(result->in(0)->in(MemNode::Address)); |
956 if (at != Type::TOP) { | 2446 if (at != Type::TOP) { |
957 assert (at->isa_ptr() != NULL, "pointer type required."); | 2447 assert (at->isa_ptr() != NULL, "pointer type required."); |
958 int idx = C->get_alias_index(at->is_ptr()); | 2448 int idx = C->get_alias_index(at->is_ptr()); |
959 assert(idx != alias_idx, "Object is not scalar replaceable if a LoadStore node access its field"); | 2449 assert(idx != alias_idx, "Object is not scalar replaceable if a LoadStore node access its field"); |
960 break; | 2450 break; |
970 // Push all non-instance Phis on the orig_phis worklist to update inputs | 2460 // Push all non-instance Phis on the orig_phis worklist to update inputs |
971 // during Phase 4 if needed. | 2461 // during Phase 4 if needed. |
972 orig_phis.append_if_missing(mphi); | 2462 orig_phis.append_if_missing(mphi); |
973 } else if (C->get_alias_index(t) != alias_idx) { | 2463 } else if (C->get_alias_index(t) != alias_idx) { |
974 // Create a new Phi with the specified alias index type. | 2464 // Create a new Phi with the specified alias index type. |
975 result = split_memory_phi(mphi, alias_idx, orig_phis, phase); | 2465 result = split_memory_phi(mphi, alias_idx, orig_phis); |
976 } | 2466 } |
977 } | 2467 } |
978 // the result is either MemNode, PhiNode, InitializeNode. | 2468 // the result is either MemNode, PhiNode, InitializeNode. |
979 return result; | 2469 return result; |
980 } | 2470 } |
1069 // 100 LoadP _ 80 20 ... alias_index=4 | 2559 // 100 LoadP _ 80 20 ... alias_index=4 |
1070 // | 2560 // |
1071 void ConnectionGraph::split_unique_types(GrowableArray<Node *> &alloc_worklist) { | 2561 void ConnectionGraph::split_unique_types(GrowableArray<Node *> &alloc_worklist) { |
1072 GrowableArray<Node *> memnode_worklist; | 2562 GrowableArray<Node *> memnode_worklist; |
1073 GrowableArray<PhiNode *> orig_phis; | 2563 GrowableArray<PhiNode *> orig_phis; |
1074 | |
1075 PhaseIterGVN *igvn = _igvn; | 2564 PhaseIterGVN *igvn = _igvn; |
1076 uint new_index_start = (uint) _compile->num_alias_types(); | 2565 uint new_index_start = (uint) _compile->num_alias_types(); |
1077 Arena* arena = Thread::current()->resource_area(); | 2566 Arena* arena = Thread::current()->resource_area(); |
1078 VectorSet visited(arena); | 2567 VectorSet visited(arena); |
1079 | 2568 ideal_nodes.clear(); // Reset for use with set_map/get_map. |
2569 uint unique_old = _compile->unique(); | |
1080 | 2570 |
1081 // Phase 1: Process possible allocations from alloc_worklist. | 2571 // Phase 1: Process possible allocations from alloc_worklist. |
1082 // Create instance types for the CheckCastPP for allocations where possible. | 2572 // Create instance types for the CheckCastPP for allocations where possible. |
1083 // | 2573 // |
1084 // (Note: don't forget to change the order of the second AddP node on | 2574 // (Note: don't forget to change the order of the second AddP node on |
1086 // see the comment in find_second_addp().) | 2576 // see the comment in find_second_addp().) |
1087 // | 2577 // |
1088 while (alloc_worklist.length() != 0) { | 2578 while (alloc_worklist.length() != 0) { |
1089 Node *n = alloc_worklist.pop(); | 2579 Node *n = alloc_worklist.pop(); |
1090 uint ni = n->_idx; | 2580 uint ni = n->_idx; |
1091 const TypeOopPtr* tinst = NULL; | |
1092 if (n->is_Call()) { | 2581 if (n->is_Call()) { |
1093 CallNode *alloc = n->as_Call(); | 2582 CallNode *alloc = n->as_Call(); |
1094 // copy escape information to call node | 2583 // copy escape information to call node |
1095 PointsToNode* ptn = ptnode_adr(alloc->_idx); | 2584 PointsToNode* ptn = ptnode_adr(alloc->_idx); |
1096 PointsToNode::EscapeState es = escape_state(alloc); | 2585 PointsToNode::EscapeState es = ptn->escape_state(); |
1097 // We have an allocation or call which returns a Java object, | 2586 // We have an allocation or call which returns a Java object, |
1098 // see if it is unescaped. | 2587 // see if it is unescaped. |
1099 if (es != PointsToNode::NoEscape || !ptn->scalar_replaceable()) | 2588 if (es != PointsToNode::NoEscape || !ptn->scalar_replaceable()) |
1100 continue; | 2589 continue; |
1101 | |
1102 // Find CheckCastPP for the allocate or for the return value of a call | 2590 // Find CheckCastPP for the allocate or for the return value of a call |
1103 n = alloc->result_cast(); | 2591 n = alloc->result_cast(); |
1104 if (n == NULL) { // No uses except Initialize node | 2592 if (n == NULL) { // No uses except Initialize node |
1105 if (alloc->is_Allocate()) { | 2593 if (alloc->is_Allocate()) { |
1106 // Set the scalar_replaceable flag for allocation | 2594 // Set the scalar_replaceable flag for allocation |
1143 if (alloc->is_Allocate()) { | 2631 if (alloc->is_Allocate()) { |
1144 // Set the scalar_replaceable flag for allocation | 2632 // Set the scalar_replaceable flag for allocation |
1145 // so it could be eliminated. | 2633 // so it could be eliminated. |
1146 alloc->as_Allocate()->_is_scalar_replaceable = true; | 2634 alloc->as_Allocate()->_is_scalar_replaceable = true; |
1147 } | 2635 } |
1148 set_escape_state(n->_idx, es); // CheckCastPP escape state | 2636 set_escape_state(ptnode_adr(n->_idx), es); // CheckCastPP escape state |
1149 // in order for an object to be scalar-replaceable, it must be: | 2637 // in order for an object to be scalar-replaceable, it must be: |
1150 // - a direct allocation (not a call returning an object) | 2638 // - a direct allocation (not a call returning an object) |
1151 // - non-escaping | 2639 // - non-escaping |
1152 // - eligible to be a unique type | 2640 // - eligible to be a unique type |
1153 // - not determined to be ineligible by escape analysis | 2641 // - not determined to be ineligible by escape analysis |
1154 assert(ptnode_adr(alloc->_idx)->_node != NULL && | 2642 set_map(alloc, n); |
1155 ptnode_adr(n->_idx)->_node != NULL, "should be registered"); | 2643 set_map(n, alloc); |
1156 set_map(alloc->_idx, n); | |
1157 set_map(n->_idx, alloc); | |
1158 const TypeOopPtr *t = igvn->type(n)->isa_oopptr(); | 2644 const TypeOopPtr *t = igvn->type(n)->isa_oopptr(); |
1159 if (t == NULL) | 2645 if (t == NULL) |
1160 continue; // not a TypeOopPtr | 2646 continue; // not a TypeOopPtr |
1161 tinst = t->cast_to_exactness(true)->is_oopptr()->cast_to_instance_id(ni); | 2647 const TypeOopPtr* tinst = t->cast_to_exactness(true)->is_oopptr()->cast_to_instance_id(ni); |
1162 igvn->hash_delete(n); | 2648 igvn->hash_delete(n); |
1163 igvn->set_type(n, tinst); | 2649 igvn->set_type(n, tinst); |
1164 n->raise_bottom_type(tinst); | 2650 n->raise_bottom_type(tinst); |
1165 igvn->hash_insert(n); | 2651 igvn->hash_insert(n); |
1166 record_for_optimizer(n); | 2652 record_for_optimizer(n); |
1167 if (alloc->is_Allocate() && (t->isa_instptr() || t->isa_aryptr())) { | 2653 if (alloc->is_Allocate() && (t->isa_instptr() || t->isa_aryptr())) { |
1168 | 2654 |
1169 // First, put on the worklist all Field edges from Connection Graph | 2655 // First, put on the worklist all Field edges from Connection Graph |
1170 // which is more accurate then putting immediate users from Ideal Graph. | 2656 // which is more accurate then putting immediate users from Ideal Graph. |
1171 for (uint e = 0; e < ptn->edge_count(); e++) { | 2657 for (EdgeIterator e(ptn); e.has_next(); e.next()) { |
1172 Node *use = ptnode_adr(ptn->edge_target(e))->_node; | 2658 PointsToNode* tgt = e.get(); |
1173 assert(ptn->edge_type(e) == PointsToNode::FieldEdge && use->is_AddP(), | 2659 Node* use = tgt->ideal_node(); |
2660 assert(tgt->is_Field() && use->is_AddP(), | |
1174 "only AddP nodes are Field edges in CG"); | 2661 "only AddP nodes are Field edges in CG"); |
1175 if (use->outcnt() > 0) { // Don't process dead nodes | 2662 if (use->outcnt() > 0) { // Don't process dead nodes |
1176 Node* addp2 = find_second_addp(use, use->in(AddPNode::Base)); | 2663 Node* addp2 = find_second_addp(use, use->in(AddPNode::Base)); |
1177 if (addp2 != NULL) { | 2664 if (addp2 != NULL) { |
1178 assert(alloc->is_AllocateArray(),"array allocation was expected"); | 2665 assert(alloc->is_AllocateArray(),"array allocation was expected"); |
1200 memnode_worklist.append_if_missing(use); | 2687 memnode_worklist.append_if_missing(use); |
1201 } | 2688 } |
1202 } | 2689 } |
1203 } | 2690 } |
1204 } else if (n->is_AddP()) { | 2691 } else if (n->is_AddP()) { |
1205 VectorSet* ptset = PointsTo(get_addp_base(n)); | 2692 JavaObjectNode* jobj = unique_java_object(get_addp_base(n)); |
1206 assert(ptset->Size() == 1, "AddP address is unique"); | 2693 if (jobj == NULL || jobj == phantom_obj) { |
1207 uint elem = ptset->getelem(); // Allocation node's index | 2694 #ifdef ASSERT |
1208 if (elem == _phantom_object) { | 2695 ptnode_adr(get_addp_base(n)->_idx)->dump(); |
1209 assert(false, "escaped allocation"); | 2696 ptnode_adr(n->_idx)->dump(); |
1210 continue; // Assume the value was set outside this method. | 2697 assert(jobj != NULL && jobj != phantom_obj, "escaped allocation"); |
1211 } | 2698 #endif |
1212 Node *base = get_map(elem); // CheckCastPP node | 2699 _compile->record_failure(C2Compiler::retry_no_escape_analysis()); |
1213 if (!split_AddP(n, base, igvn)) continue; // wrong type from dead path | 2700 return; |
1214 tinst = igvn->type(base)->isa_oopptr(); | 2701 } |
2702 Node *base = get_map(jobj->idx()); // CheckCastPP node | |
2703 if (!split_AddP(n, base)) continue; // wrong type from dead path | |
1215 } else if (n->is_Phi() || | 2704 } else if (n->is_Phi() || |
1216 n->is_CheckCastPP() || | 2705 n->is_CheckCastPP() || |
1217 n->is_EncodeP() || | 2706 n->is_EncodeP() || |
1218 n->is_DecodeN() || | 2707 n->is_DecodeN() || |
1219 (n->is_ConstraintCast() && n->Opcode() == Op_CastPP)) { | 2708 (n->is_ConstraintCast() && n->Opcode() == Op_CastPP)) { |
1220 if (visited.test_set(n->_idx)) { | 2709 if (visited.test_set(n->_idx)) { |
1221 assert(n->is_Phi(), "loops only through Phi's"); | 2710 assert(n->is_Phi(), "loops only through Phi's"); |
1222 continue; // already processed | 2711 continue; // already processed |
1223 } | 2712 } |
1224 VectorSet* ptset = PointsTo(n); | 2713 JavaObjectNode* jobj = unique_java_object(n); |
1225 if (ptset->Size() == 1) { | 2714 if (jobj == NULL || jobj == phantom_obj) { |
1226 uint elem = ptset->getelem(); // Allocation node's index | 2715 #ifdef ASSERT |
1227 if (elem == _phantom_object) { | 2716 ptnode_adr(n->_idx)->dump(); |
1228 assert(false, "escaped allocation"); | 2717 assert(jobj != NULL && jobj != phantom_obj, "escaped allocation"); |
1229 continue; // Assume the value was set outside this method. | 2718 #endif |
1230 } | 2719 _compile->record_failure(C2Compiler::retry_no_escape_analysis()); |
1231 Node *val = get_map(elem); // CheckCastPP node | 2720 return; |
2721 } else { | |
2722 Node *val = get_map(jobj->idx()); // CheckCastPP node | |
1232 TypeNode *tn = n->as_Type(); | 2723 TypeNode *tn = n->as_Type(); |
1233 tinst = igvn->type(val)->isa_oopptr(); | 2724 const TypeOopPtr* tinst = igvn->type(val)->isa_oopptr(); |
1234 assert(tinst != NULL && tinst->is_known_instance() && | 2725 assert(tinst != NULL && tinst->is_known_instance() && |
1235 (uint)tinst->instance_id() == elem , "instance type expected."); | 2726 tinst->instance_id() == jobj->idx() , "instance type expected."); |
1236 | 2727 |
1237 const Type *tn_type = igvn->type(tn); | 2728 const Type *tn_type = igvn->type(tn); |
1238 const TypeOopPtr *tn_t; | 2729 const TypeOopPtr *tn_t; |
1239 if (tn_type->isa_narrowoop()) { | 2730 if (tn_type->isa_narrowoop()) { |
1240 tn_t = tn_type->make_ptr()->isa_oopptr(); | 2731 tn_t = tn_type->make_ptr()->isa_oopptr(); |
1241 } else { | 2732 } else { |
1242 tn_t = tn_type->isa_oopptr(); | 2733 tn_t = tn_type->isa_oopptr(); |
1243 } | 2734 } |
1244 | |
1245 if (tn_t != NULL && tinst->klass()->is_subtype_of(tn_t->klass())) { | 2735 if (tn_t != NULL && tinst->klass()->is_subtype_of(tn_t->klass())) { |
1246 if (tn_type->isa_narrowoop()) { | 2736 if (tn_type->isa_narrowoop()) { |
1247 tn_type = tinst->make_narrowoop(); | 2737 tn_type = tinst->make_narrowoop(); |
1248 } else { | 2738 } else { |
1249 tn_type = tinst; | 2739 tn_type = tinst; |
1312 } | 2802 } |
1313 | 2803 |
1314 } | 2804 } |
1315 // New alias types were created in split_AddP(). | 2805 // New alias types were created in split_AddP(). |
1316 uint new_index_end = (uint) _compile->num_alias_types(); | 2806 uint new_index_end = (uint) _compile->num_alias_types(); |
2807 assert(unique_old == _compile->unique(), "there should be no new ideal nodes after Phase 1"); | |
1317 | 2808 |
1318 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and | 2809 // Phase 2: Process MemNode's from memnode_worklist. compute new address type and |
1319 // compute new values for Memory inputs (the Memory inputs are not | 2810 // compute new values for Memory inputs (the Memory inputs are not |
1320 // actually updated until phase 4.) | 2811 // actually updated until phase 4.) |
1321 if (memnode_worklist.length() == 0) | 2812 if (memnode_worklist.length() == 0) |
1322 return; // nothing to do | 2813 return; // nothing to do |
1323 | |
1324 while (memnode_worklist.length() != 0) { | 2814 while (memnode_worklist.length() != 0) { |
1325 Node *n = memnode_worklist.pop(); | 2815 Node *n = memnode_worklist.pop(); |
1326 if (visited.test_set(n->_idx)) | 2816 if (visited.test_set(n->_idx)) |
1327 continue; | 2817 continue; |
1328 if (n->is_Phi() || n->is_ClearArray()) { | 2818 if (n->is_Phi() || n->is_ClearArray()) { |
1339 if (addr_t == Type::TOP) | 2829 if (addr_t == Type::TOP) |
1340 continue; | 2830 continue; |
1341 assert (addr_t->isa_ptr() != NULL, "pointer type required."); | 2831 assert (addr_t->isa_ptr() != NULL, "pointer type required."); |
1342 int alias_idx = _compile->get_alias_index(addr_t->is_ptr()); | 2832 int alias_idx = _compile->get_alias_index(addr_t->is_ptr()); |
1343 assert ((uint)alias_idx < new_index_end, "wrong alias index"); | 2833 assert ((uint)alias_idx < new_index_end, "wrong alias index"); |
1344 Node *mem = find_inst_mem(n->in(MemNode::Memory), alias_idx, orig_phis, igvn); | 2834 Node *mem = find_inst_mem(n->in(MemNode::Memory), alias_idx, orig_phis); |
1345 if (_compile->failing()) { | 2835 if (_compile->failing()) { |
1346 return; | 2836 return; |
1347 } | 2837 } |
1348 if (mem != n->in(MemNode::Memory)) { | 2838 if (mem != n->in(MemNode::Memory)) { |
1349 // We delay the memory edge update since we need old one in | 2839 // We delay the memory edge update since we need old one in |
1350 // MergeMem code below when instances memory slices are separated. | 2840 // MergeMem code below when instances memory slices are separated. |
1351 debug_only(Node* pn = ptnode_adr(n->_idx)->_node;) | 2841 set_map(n, mem); |
1352 assert(pn == NULL || pn == n, "wrong node"); | |
1353 set_map(n->_idx, mem); | |
1354 ptnode_adr(n->_idx)->_node = n; | |
1355 } | 2842 } |
1356 if (n->is_Load()) { | 2843 if (n->is_Load()) { |
1357 continue; // don't push users | 2844 continue; // don't push users |
1358 } else if (n->is_LoadStore()) { | 2845 } else if (n->is_LoadStore()) { |
1359 // get the memory projection | 2846 // get the memory projection |
1440 // already a memory slice of the instance along the memory chain. | 2927 // already a memory slice of the instance along the memory chain. |
1441 for (uint ni = new_index_start; ni < new_index_end; ni++) { | 2928 for (uint ni = new_index_start; ni < new_index_end; ni++) { |
1442 if((uint)_compile->get_general_index(ni) == i) { | 2929 if((uint)_compile->get_general_index(ni) == i) { |
1443 Node *m = (ni >= nmm->req()) ? nmm->empty_memory() : nmm->in(ni); | 2930 Node *m = (ni >= nmm->req()) ? nmm->empty_memory() : nmm->in(ni); |
1444 if (nmm->is_empty_memory(m)) { | 2931 if (nmm->is_empty_memory(m)) { |
1445 Node* result = find_inst_mem(mem, ni, orig_phis, igvn); | 2932 Node* result = find_inst_mem(mem, ni, orig_phis); |
1446 if (_compile->failing()) { | 2933 if (_compile->failing()) { |
1447 return; | 2934 return; |
1448 } | 2935 } |
1449 nmm->set_memory_at(ni, result); | 2936 nmm->set_memory_at(ni, result); |
1450 } | 2937 } |
1456 const TypeOopPtr *tinst = _compile->get_adr_type(ni)->isa_oopptr(); | 2943 const TypeOopPtr *tinst = _compile->get_adr_type(ni)->isa_oopptr(); |
1457 Node* result = step_through_mergemem(nmm, ni, tinst); | 2944 Node* result = step_through_mergemem(nmm, ni, tinst); |
1458 if (result == nmm->base_memory()) { | 2945 if (result == nmm->base_memory()) { |
1459 // Didn't find instance memory, search through general slice recursively. | 2946 // Didn't find instance memory, search through general slice recursively. |
1460 result = nmm->memory_at(_compile->get_general_index(ni)); | 2947 result = nmm->memory_at(_compile->get_general_index(ni)); |
1461 result = find_inst_mem(result, ni, orig_phis, igvn); | 2948 result = find_inst_mem(result, ni, orig_phis); |
1462 if (_compile->failing()) { | 2949 if (_compile->failing()) { |
1463 return; | 2950 return; |
1464 } | 2951 } |
1465 nmm->set_memory_at(ni, result); | 2952 nmm->set_memory_at(ni, result); |
1466 } | 2953 } |
1480 PhiNode *phi = orig_phis.at(j); | 2967 PhiNode *phi = orig_phis.at(j); |
1481 int alias_idx = _compile->get_alias_index(phi->adr_type()); | 2968 int alias_idx = _compile->get_alias_index(phi->adr_type()); |
1482 igvn->hash_delete(phi); | 2969 igvn->hash_delete(phi); |
1483 for (uint i = 1; i < phi->req(); i++) { | 2970 for (uint i = 1; i < phi->req(); i++) { |
1484 Node *mem = phi->in(i); | 2971 Node *mem = phi->in(i); |
1485 Node *new_mem = find_inst_mem(mem, alias_idx, orig_phis, igvn); | 2972 Node *new_mem = find_inst_mem(mem, alias_idx, orig_phis); |
1486 if (_compile->failing()) { | 2973 if (_compile->failing()) { |
1487 return; | 2974 return; |
1488 } | 2975 } |
1489 if (mem != new_mem) { | 2976 if (mem != new_mem) { |
1490 phi->set_req(i, new_mem); | 2977 phi->set_req(i, new_mem); |
1494 record_for_optimizer(phi); | 2981 record_for_optimizer(phi); |
1495 } | 2982 } |
1496 | 2983 |
1497 // Update the memory inputs of MemNodes with the value we computed | 2984 // Update the memory inputs of MemNodes with the value we computed |
1498 // in Phase 2 and move stores memory users to corresponding memory slices. | 2985 // in Phase 2 and move stores memory users to corresponding memory slices. |
1499 | |
1500 // Disable memory split verification code until the fix for 6984348. | 2986 // Disable memory split verification code until the fix for 6984348. |
1501 // Currently it produces false negative results since it does not cover all cases. | 2987 // Currently it produces false negative results since it does not cover all cases. |
1502 #if 0 // ifdef ASSERT | 2988 #if 0 // ifdef ASSERT |
1503 visited.Reset(); | 2989 visited.Reset(); |
1504 Node_Stack old_mems(arena, _compile->unique() >> 2); | 2990 Node_Stack old_mems(arena, _compile->unique() >> 2); |
1505 #endif | 2991 #endif |
1506 for (uint i = 0; i < nodes_size(); i++) { | 2992 for (uint i = 0; i < ideal_nodes.size(); i++) { |
1507 Node *nmem = get_map(i); | 2993 Node* n = ideal_nodes.at(i); |
1508 if (nmem != NULL) { | 2994 Node* nmem = get_map(n->_idx); |
1509 Node *n = ptnode_adr(i)->_node; | 2995 assert(nmem != NULL, "sanity"); |
1510 assert(n != NULL, "sanity"); | 2996 if (n->is_Mem()) { |
1511 if (n->is_Mem()) { | |
1512 #if 0 // ifdef ASSERT | 2997 #if 0 // ifdef ASSERT |
1513 Node* old_mem = n->in(MemNode::Memory); | 2998 Node* old_mem = n->in(MemNode::Memory); |
1514 if (!visited.test_set(old_mem->_idx)) { | 2999 if (!visited.test_set(old_mem->_idx)) { |
1515 old_mems.push(old_mem, old_mem->outcnt()); | 3000 old_mems.push(old_mem, old_mem->outcnt()); |
1516 } | 3001 } |
1517 #endif | 3002 #endif |
1518 assert(n->in(MemNode::Memory) != nmem, "sanity"); | 3003 assert(n->in(MemNode::Memory) != nmem, "sanity"); |
1519 if (!n->is_Load()) { | 3004 if (!n->is_Load()) { |
1520 // Move memory users of a store first. | 3005 // Move memory users of a store first. |
1521 move_inst_mem(n, orig_phis, igvn); | 3006 move_inst_mem(n, orig_phis); |
1522 } | 3007 } |
1523 // Now update memory input | 3008 // Now update memory input |
1524 igvn->hash_delete(n); | 3009 igvn->hash_delete(n); |
1525 n->set_req(MemNode::Memory, nmem); | 3010 n->set_req(MemNode::Memory, nmem); |
1526 igvn->hash_insert(n); | 3011 igvn->hash_insert(n); |
1527 record_for_optimizer(n); | 3012 record_for_optimizer(n); |
1528 } else { | 3013 } else { |
1529 assert(n->is_Allocate() || n->is_CheckCastPP() || | 3014 assert(n->is_Allocate() || n->is_CheckCastPP() || |
1530 n->is_AddP() || n->is_Phi(), "unknown node used for set_map()"); | 3015 n->is_AddP() || n->is_Phi(), "unknown node used for set_map()"); |
1531 } | |
1532 } | 3016 } |
1533 } | 3017 } |
1534 #if 0 // ifdef ASSERT | 3018 #if 0 // ifdef ASSERT |
1535 // Verify that memory was split correctly | 3019 // Verify that memory was split correctly |
1536 while (old_mems.is_nonempty()) { | 3020 while (old_mems.is_nonempty()) { |
1540 assert(old_cnt == old_mem->outcnt(), "old mem could be lost"); | 3024 assert(old_cnt == old_mem->outcnt(), "old mem could be lost"); |
1541 } | 3025 } |
1542 #endif | 3026 #endif |
1543 } | 3027 } |
1544 | 3028 |
1545 bool ConnectionGraph::has_candidates(Compile *C) { | |
1546 // EA brings benefits only when the code has allocations and/or locks which | |
1547 // are represented by ideal Macro nodes. | |
1548 int cnt = C->macro_count(); | |
1549 for( int i=0; i < cnt; i++ ) { | |
1550 Node *n = C->macro_node(i); | |
1551 if ( n->is_Allocate() ) | |
1552 return true; | |
1553 if( n->is_Lock() ) { | |
1554 Node* obj = n->as_Lock()->obj_node()->uncast(); | |
1555 if( !(obj->is_Parm() || obj->is_Con()) ) | |
1556 return true; | |
1557 } | |
1558 } | |
1559 return false; | |
1560 } | |
1561 | |
1562 void ConnectionGraph::do_analysis(Compile *C, PhaseIterGVN *igvn) { | |
1563 // Add ConP#NULL and ConN#NULL nodes before ConnectionGraph construction | |
1564 // to create space for them in ConnectionGraph::_nodes[]. | |
1565 Node* oop_null = igvn->zerocon(T_OBJECT); | |
1566 Node* noop_null = igvn->zerocon(T_NARROWOOP); | |
1567 | |
1568 ConnectionGraph* congraph = new(C->comp_arena()) ConnectionGraph(C, igvn); | |
1569 // Perform escape analysis | |
1570 if (congraph->compute_escape()) { | |
1571 // There are non escaping objects. | |
1572 C->set_congraph(congraph); | |
1573 } | |
1574 | |
1575 // Cleanup. | |
1576 if (oop_null->outcnt() == 0) | |
1577 igvn->hash_delete(oop_null); | |
1578 if (noop_null->outcnt() == 0) | |
1579 igvn->hash_delete(noop_null); | |
1580 } | |
1581 | |
1582 bool ConnectionGraph::compute_escape() { | |
1583 Compile* C = _compile; | |
1584 | |
1585 // 1. Populate Connection Graph (CG) with Ideal nodes. | |
1586 | |
1587 Unique_Node_List worklist_init; | |
1588 worklist_init.map(C->unique(), NULL); // preallocate space | |
1589 | |
1590 // Initialize worklist | |
1591 if (C->root() != NULL) { | |
1592 worklist_init.push(C->root()); | |
1593 } | |
1594 | |
1595 GrowableArray<Node*> alloc_worklist; | |
1596 GrowableArray<Node*> addp_worklist; | |
1597 GrowableArray<Node*> ptr_cmp_worklist; | |
1598 GrowableArray<Node*> storestore_worklist; | |
1599 PhaseGVN* igvn = _igvn; | |
1600 | |
1601 // Push all useful nodes onto CG list and set their type. | |
1602 for( uint next = 0; next < worklist_init.size(); ++next ) { | |
1603 Node* n = worklist_init.at(next); | |
1604 record_for_escape_analysis(n, igvn); | |
1605 // Only allocations and java static calls results are checked | |
1606 // for an escape status. See process_call_result() below. | |
1607 if (n->is_Allocate() || n->is_CallStaticJava() && | |
1608 ptnode_adr(n->_idx)->node_type() == PointsToNode::JavaObject) { | |
1609 alloc_worklist.append(n); | |
1610 } else if(n->is_AddP()) { | |
1611 // Collect address nodes. Use them during stage 3 below | |
1612 // to build initial connection graph field edges. | |
1613 addp_worklist.append(n); | |
1614 } else if (n->is_MergeMem()) { | |
1615 // Collect all MergeMem nodes to add memory slices for | |
1616 // scalar replaceable objects in split_unique_types(). | |
1617 _mergemem_worklist.append(n->as_MergeMem()); | |
1618 } else if (OptimizePtrCompare && n->is_Cmp() && | |
1619 (n->Opcode() == Op_CmpP || n->Opcode() == Op_CmpN)) { | |
1620 // Compare pointers nodes | |
1621 ptr_cmp_worklist.append(n); | |
1622 } else if (n->is_MemBarStoreStore()) { | |
1623 // Collect all MemBarStoreStore nodes so that depending on the | |
1624 // escape status of the associated Allocate node some of them | |
1625 // may be eliminated. | |
1626 storestore_worklist.append(n); | |
1627 } | |
1628 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1629 Node* m = n->fast_out(i); // Get user | |
1630 worklist_init.push(m); | |
1631 } | |
1632 } | |
1633 | |
1634 if (alloc_worklist.length() == 0) { | |
1635 _collecting = false; | |
1636 return false; // Nothing to do. | |
1637 } | |
1638 | |
1639 // 2. First pass to create simple CG edges (doesn't require to walk CG). | |
1640 uint delayed_size = _delayed_worklist.size(); | |
1641 for( uint next = 0; next < delayed_size; ++next ) { | |
1642 Node* n = _delayed_worklist.at(next); | |
1643 build_connection_graph(n, igvn); | |
1644 } | |
1645 | |
1646 // 3. Pass to create initial fields edges (JavaObject -F-> AddP) | |
1647 // to reduce number of iterations during stage 4 below. | |
1648 uint addp_length = addp_worklist.length(); | |
1649 for( uint next = 0; next < addp_length; ++next ) { | |
1650 Node* n = addp_worklist.at(next); | |
1651 Node* base = get_addp_base(n); | |
1652 if (base->is_Proj() && base->in(0)->is_Call()) | |
1653 base = base->in(0); | |
1654 PointsToNode::NodeType nt = ptnode_adr(base->_idx)->node_type(); | |
1655 if (nt == PointsToNode::JavaObject) { | |
1656 build_connection_graph(n, igvn); | |
1657 } | |
1658 } | |
1659 | |
1660 GrowableArray<int> cg_worklist; | |
1661 cg_worklist.append(_phantom_object); | |
1662 GrowableArray<uint> worklist; | |
1663 | |
1664 // 4. Build Connection Graph which need | |
1665 // to walk the connection graph. | |
1666 _progress = false; | |
1667 for (uint ni = 0; ni < nodes_size(); ni++) { | |
1668 PointsToNode* ptn = ptnode_adr(ni); | |
1669 Node *n = ptn->_node; | |
1670 if (n != NULL) { // Call, AddP, LoadP, StoreP | |
1671 build_connection_graph(n, igvn); | |
1672 if (ptn->node_type() != PointsToNode::UnknownType) | |
1673 cg_worklist.append(n->_idx); // Collect CG nodes | |
1674 if (!_processed.test(n->_idx)) | |
1675 worklist.append(n->_idx); // Collect C/A/L/S nodes | |
1676 } | |
1677 } | |
1678 | |
1679 // After IGVN user nodes may have smaller _idx than | |
1680 // their inputs so they will be processed first in | |
1681 // previous loop. Because of that not all Graph | |
1682 // edges will be created. Walk over interesting | |
1683 // nodes again until no new edges are created. | |
1684 // | |
1685 // Normally only 1-3 passes needed to build | |
1686 // Connection Graph depending on graph complexity. | |
1687 // Observed 8 passes in jvm2008 compiler.compiler. | |
1688 // Set limit to 20 to catch situation when something | |
1689 // did go wrong and recompile the method without EA. | |
1690 // Also limit build time to 30 sec (60 in debug VM). | |
1691 | |
1692 #define CG_BUILD_ITER_LIMIT 20 | |
1693 | |
1694 #ifdef ASSERT | |
1695 #define CG_BUILD_TIME_LIMIT 60.0 | |
1696 #else | |
1697 #define CG_BUILD_TIME_LIMIT 30.0 | |
1698 #endif | |
1699 | |
1700 uint length = worklist.length(); | |
1701 int iterations = 0; | |
1702 elapsedTimer time; | |
1703 while(_progress && | |
1704 (iterations++ < CG_BUILD_ITER_LIMIT) && | |
1705 (time.seconds() < CG_BUILD_TIME_LIMIT)) { | |
1706 time.start(); | |
1707 _progress = false; | |
1708 for( uint next = 0; next < length; ++next ) { | |
1709 int ni = worklist.at(next); | |
1710 PointsToNode* ptn = ptnode_adr(ni); | |
1711 Node* n = ptn->_node; | |
1712 assert(n != NULL, "should be known node"); | |
1713 build_connection_graph(n, igvn); | |
1714 } | |
1715 time.stop(); | |
1716 } | |
1717 if ((iterations >= CG_BUILD_ITER_LIMIT) || | |
1718 (time.seconds() >= CG_BUILD_TIME_LIMIT)) { | |
1719 assert(false, err_msg("infinite EA connection graph build (%f sec, %d iterations) with %d nodes and worklist size %d", | |
1720 time.seconds(), iterations, nodes_size(), length)); | |
1721 // Possible infinite build_connection_graph loop, | |
1722 // bailout (no changes to ideal graph were made). | |
1723 _collecting = false; | |
1724 return false; | |
1725 } | |
1726 #undef CG_BUILD_ITER_LIMIT | |
1727 #undef CG_BUILD_TIME_LIMIT | |
1728 | |
1729 // 5. Propagate escaped states. | |
1730 worklist.clear(); | |
1731 | |
1732 // mark all nodes reachable from GlobalEscape nodes | |
1733 (void)propagate_escape_state(&cg_worklist, &worklist, PointsToNode::GlobalEscape); | |
1734 | |
1735 // mark all nodes reachable from ArgEscape nodes | |
1736 bool has_non_escaping_obj = propagate_escape_state(&cg_worklist, &worklist, PointsToNode::ArgEscape); | |
1737 | |
1738 Arena* arena = Thread::current()->resource_area(); | |
1739 VectorSet visited(arena); | |
1740 | |
1741 // 6. Find fields initializing values for not escaped allocations | |
1742 uint alloc_length = alloc_worklist.length(); | |
1743 for (uint next = 0; next < alloc_length; ++next) { | |
1744 Node* n = alloc_worklist.at(next); | |
1745 PointsToNode::EscapeState es = ptnode_adr(n->_idx)->escape_state(); | |
1746 if (es == PointsToNode::NoEscape) { | |
1747 has_non_escaping_obj = true; | |
1748 if (n->is_Allocate()) { | |
1749 find_init_values(n, &visited, igvn); | |
1750 // The object allocated by this Allocate node will never be | |
1751 // seen by an other thread. Mark it so that when it is | |
1752 // expanded no MemBarStoreStore is added. | |
1753 n->as_Allocate()->initialization()->set_does_not_escape(); | |
1754 } | |
1755 } else if ((es == PointsToNode::ArgEscape) && n->is_Allocate()) { | |
1756 // Same as above. Mark this Allocate node so that when it is | |
1757 // expanded no MemBarStoreStore is added. | |
1758 n->as_Allocate()->initialization()->set_does_not_escape(); | |
1759 } | |
1760 } | |
1761 | |
1762 uint cg_length = cg_worklist.length(); | |
1763 | |
1764 // Skip the rest of code if all objects escaped. | |
1765 if (!has_non_escaping_obj) { | |
1766 cg_length = 0; | |
1767 addp_length = 0; | |
1768 } | |
1769 | |
1770 for (uint next = 0; next < cg_length; ++next) { | |
1771 int ni = cg_worklist.at(next); | |
1772 PointsToNode* ptn = ptnode_adr(ni); | |
1773 PointsToNode::NodeType nt = ptn->node_type(); | |
1774 if (nt == PointsToNode::LocalVar || nt == PointsToNode::Field) { | |
1775 if (ptn->edge_count() == 0) { | |
1776 // No values were found. Assume the value was set | |
1777 // outside this method - add edge to phantom object. | |
1778 add_pointsto_edge(ni, _phantom_object); | |
1779 } | |
1780 } | |
1781 } | |
1782 | |
1783 // 7. Remove deferred edges from the graph. | |
1784 for (uint next = 0; next < cg_length; ++next) { | |
1785 int ni = cg_worklist.at(next); | |
1786 PointsToNode* ptn = ptnode_adr(ni); | |
1787 PointsToNode::NodeType nt = ptn->node_type(); | |
1788 if (nt == PointsToNode::LocalVar || nt == PointsToNode::Field) { | |
1789 remove_deferred(ni, &worklist, &visited); | |
1790 } | |
1791 } | |
1792 | |
1793 // 8. Adjust escape state of nonescaping objects. | |
1794 for (uint next = 0; next < addp_length; ++next) { | |
1795 Node* n = addp_worklist.at(next); | |
1796 adjust_escape_state(n); | |
1797 } | |
1798 | |
1799 // push all NoEscape nodes on the worklist | |
1800 worklist.clear(); | |
1801 for( uint next = 0; next < cg_length; ++next ) { | |
1802 int nk = cg_worklist.at(next); | |
1803 if (ptnode_adr(nk)->escape_state() == PointsToNode::NoEscape && | |
1804 !is_null_ptr(nk)) | |
1805 worklist.push(nk); | |
1806 } | |
1807 | |
1808 alloc_worklist.clear(); | |
1809 // Propagate scalar_replaceable value. | |
1810 while(worklist.length() > 0) { | |
1811 uint nk = worklist.pop(); | |
1812 PointsToNode* ptn = ptnode_adr(nk); | |
1813 Node* n = ptn->_node; | |
1814 bool scalar_replaceable = ptn->scalar_replaceable(); | |
1815 if (n->is_Allocate() && scalar_replaceable) { | |
1816 // Push scalar replaceable allocations on alloc_worklist | |
1817 // for processing in split_unique_types(). Note, | |
1818 // following code may change scalar_replaceable value. | |
1819 alloc_worklist.append(n); | |
1820 } | |
1821 uint e_cnt = ptn->edge_count(); | |
1822 for (uint ei = 0; ei < e_cnt; ei++) { | |
1823 uint npi = ptn->edge_target(ei); | |
1824 if (is_null_ptr(npi)) | |
1825 continue; | |
1826 PointsToNode *np = ptnode_adr(npi); | |
1827 if (np->escape_state() < PointsToNode::NoEscape) { | |
1828 set_escape_state(npi, PointsToNode::NoEscape); | |
1829 if (!scalar_replaceable) { | |
1830 np->set_scalar_replaceable(false); | |
1831 } | |
1832 worklist.push(npi); | |
1833 } else if (np->scalar_replaceable() && !scalar_replaceable) { | |
1834 np->set_scalar_replaceable(false); | |
1835 worklist.push(npi); | |
1836 } | |
1837 } | |
1838 } | |
1839 | |
1840 _collecting = false; | |
1841 assert(C->unique() == nodes_size(), "there should be no new ideal nodes during ConnectionGraph build"); | |
1842 | |
1843 assert(ptnode_adr(_oop_null)->escape_state() == PointsToNode::NoEscape && | |
1844 ptnode_adr(_oop_null)->edge_count() == 0, "sanity"); | |
1845 if (UseCompressedOops) { | |
1846 assert(ptnode_adr(_noop_null)->escape_state() == PointsToNode::NoEscape && | |
1847 ptnode_adr(_noop_null)->edge_count() == 0, "sanity"); | |
1848 } | |
1849 | |
1850 if (EliminateLocks && has_non_escaping_obj) { | |
1851 // Mark locks before changing ideal graph. | |
1852 int cnt = C->macro_count(); | |
1853 for( int i=0; i < cnt; i++ ) { | |
1854 Node *n = C->macro_node(i); | |
1855 if (n->is_AbstractLock()) { // Lock and Unlock nodes | |
1856 AbstractLockNode* alock = n->as_AbstractLock(); | |
1857 if (!alock->is_non_esc_obj()) { | |
1858 PointsToNode::EscapeState es = escape_state(alock->obj_node()); | |
1859 assert(es != PointsToNode::UnknownEscape, "should know"); | |
1860 if (es != PointsToNode::UnknownEscape && es != PointsToNode::GlobalEscape) { | |
1861 assert(!alock->is_eliminated() || alock->is_coarsened(), "sanity"); | |
1862 // The lock could be marked eliminated by lock coarsening | |
1863 // code during first IGVN before EA. Replace coarsened flag | |
1864 // to eliminate all associated locks/unlocks. | |
1865 alock->set_non_esc_obj(); | |
1866 } | |
1867 } | |
1868 } | |
1869 } | |
1870 } | |
1871 | |
1872 if (OptimizePtrCompare && has_non_escaping_obj) { | |
1873 // Add ConI(#CC_GT) and ConI(#CC_EQ). | |
1874 _pcmp_neq = igvn->makecon(TypeInt::CC_GT); | |
1875 _pcmp_eq = igvn->makecon(TypeInt::CC_EQ); | |
1876 // Optimize objects compare. | |
1877 while (ptr_cmp_worklist.length() != 0) { | |
1878 Node *n = ptr_cmp_worklist.pop(); | |
1879 Node *res = optimize_ptr_compare(n); | |
1880 if (res != NULL) { | |
1881 #ifndef PRODUCT | 3029 #ifndef PRODUCT |
1882 if (PrintOptimizePtrCompare) { | 3030 static const char *node_type_names[] = { |
1883 tty->print_cr("++++ Replaced: %d %s(%d,%d) --> %s", n->_idx, (n->Opcode() == Op_CmpP ? "CmpP" : "CmpN"), n->in(1)->_idx, n->in(2)->_idx, (res == _pcmp_eq ? "EQ" : "NotEQ")); | 3031 "UnknownType", |
1884 if (Verbose) { | 3032 "JavaObject", |
1885 n->dump(1); | 3033 "LocalVar", |
1886 } | 3034 "Field", |
1887 } | 3035 "Arraycopy" |
1888 #endif | 3036 }; |
1889 _igvn->replace_node(n, res); | 3037 |
1890 } | 3038 static const char *esc_names[] = { |
1891 } | 3039 "UnknownEscape", |
1892 // cleanup | 3040 "NoEscape", |
1893 if (_pcmp_neq->outcnt() == 0) | 3041 "ArgEscape", |
1894 igvn->hash_delete(_pcmp_neq); | 3042 "GlobalEscape" |
1895 if (_pcmp_eq->outcnt() == 0) | 3043 }; |
1896 igvn->hash_delete(_pcmp_eq); | 3044 |
1897 } | 3045 void PointsToNode::dump(bool print_state) const { |
1898 | 3046 NodeType nt = node_type(); |
1899 // For MemBarStoreStore nodes added in library_call.cpp, check | 3047 tty->print("%s ", node_type_names[(int) nt]); |
1900 // escape status of associated AllocateNode and optimize out | 3048 if (print_state) { |
1901 // MemBarStoreStore node if the allocated object never escapes. | 3049 EscapeState es = escape_state(); |
1902 while (storestore_worklist.length() != 0) { | 3050 EscapeState fields_es = fields_escape_state(); |
1903 Node *n = storestore_worklist.pop(); | 3051 tty->print("%s(%s) ", esc_names[(int)es], esc_names[(int)fields_es]); |
1904 MemBarStoreStoreNode *storestore = n ->as_MemBarStoreStore(); | 3052 if (nt == PointsToNode::JavaObject && !this->scalar_replaceable()) |
1905 Node *alloc = storestore->in(MemBarNode::Precedent)->in(0); | 3053 tty->print("NSR"); |
1906 assert (alloc->is_Allocate(), "storestore should point to AllocateNode"); | 3054 } |
1907 PointsToNode::EscapeState es = ptnode_adr(alloc->_idx)->escape_state(); | 3055 if (is_Field()) { |
1908 if (es == PointsToNode::NoEscape || es == PointsToNode::ArgEscape) { | 3056 FieldNode* f = (FieldNode*)this; |
1909 MemBarNode* mb = MemBarNode::make(C, Op_MemBarCPUOrder, Compile::AliasIdxBot); | 3057 tty->print("("); |
1910 mb->init_req(TypeFunc::Memory, storestore->in(TypeFunc::Memory)); | 3058 for (BaseIterator i(f); i.has_next(); i.next()) { |
1911 mb->init_req(TypeFunc::Control, storestore->in(TypeFunc::Control)); | 3059 PointsToNode* b = i.get(); |
1912 | 3060 tty->print(" %d%s", b->idx(),(b->is_JavaObject() ? "P" : "")); |
1913 _igvn->register_new_node_with_optimizer(mb); | 3061 } |
1914 _igvn->replace_node(storestore, mb); | 3062 tty->print(" )"); |
1915 } | 3063 } |
1916 } | 3064 tty->print("["); |
1917 | 3065 for (EdgeIterator i(this); i.has_next(); i.next()) { |
1918 #ifndef PRODUCT | 3066 PointsToNode* e = i.get(); |
1919 if (PrintEscapeAnalysis) { | 3067 tty->print(" %d%s%s", e->idx(),(e->is_JavaObject() ? "P" : (e->is_Field() ? "F" : "")), e->is_Arraycopy() ? "cp" : ""); |
1920 dump(); // Dump ConnectionGraph | 3068 } |
1921 } | 3069 tty->print(" ["); |
1922 #endif | 3070 for (UseIterator i(this); i.has_next(); i.next()) { |
1923 | 3071 PointsToNode* u = i.get(); |
1924 bool has_scalar_replaceable_candidates = false; | 3072 bool is_base = false; |
1925 alloc_length = alloc_worklist.length(); | 3073 if (PointsToNode::is_base_use(u)) { |
1926 for (uint next = 0; next < alloc_length; ++next) { | 3074 is_base = true; |
1927 Node* n = alloc_worklist.at(next); | 3075 u = PointsToNode::get_use_node(u)->as_Field(); |
1928 PointsToNode* ptn = ptnode_adr(n->_idx); | 3076 } |
1929 assert(ptn->escape_state() == PointsToNode::NoEscape, "sanity"); | 3077 tty->print(" %d%s%s", u->idx(), is_base ? "b" : "", u->is_Arraycopy() ? "cp" : ""); |
1930 if (ptn->scalar_replaceable()) { | 3078 } |
1931 has_scalar_replaceable_candidates = true; | 3079 tty->print(" ]] "); |
1932 break; | 3080 if (_node == NULL) |
1933 } | 3081 tty->print_cr("<null>"); |
1934 } | 3082 else |
1935 | 3083 _node->dump(); |
1936 if ( has_scalar_replaceable_candidates && | 3084 } |
1937 C->AliasLevel() >= 3 && EliminateAllocations ) { | 3085 |
1938 | 3086 void ConnectionGraph::dump(GrowableArray<PointsToNode*>& ptnodes_worklist) { |
1939 // Now use the escape information to create unique types for | |
1940 // scalar replaceable objects. | |
1941 split_unique_types(alloc_worklist); | |
1942 | |
1943 if (C->failing()) return false; | |
1944 | |
1945 C->print_method("After Escape Analysis", 2); | |
1946 | |
1947 #ifdef ASSERT | |
1948 } else if (Verbose && (PrintEscapeAnalysis || PrintEliminateAllocations)) { | |
1949 tty->print("=== No allocations eliminated for "); | |
1950 C->method()->print_short_name(); | |
1951 if(!EliminateAllocations) { | |
1952 tty->print(" since EliminateAllocations is off ==="); | |
1953 } else if(!has_scalar_replaceable_candidates) { | |
1954 tty->print(" since there are no scalar replaceable candidates ==="); | |
1955 } else if(C->AliasLevel() < 3) { | |
1956 tty->print(" since AliasLevel < 3 ==="); | |
1957 } | |
1958 tty->cr(); | |
1959 #endif | |
1960 } | |
1961 return has_non_escaping_obj; | |
1962 } | |
1963 | |
1964 // Find fields initializing values for allocations. | |
1965 void ConnectionGraph::find_init_values(Node* alloc, VectorSet* visited, PhaseTransform* phase) { | |
1966 assert(alloc->is_Allocate(), "Should be called for Allocate nodes only"); | |
1967 PointsToNode* pta = ptnode_adr(alloc->_idx); | |
1968 assert(pta->escape_state() == PointsToNode::NoEscape, "Not escaped Allocate nodes only"); | |
1969 InitializeNode* ini = alloc->as_Allocate()->initialization(); | |
1970 | |
1971 Compile* C = _compile; | |
1972 visited->Reset(); | |
1973 // Check if a oop field's initializing value is recorded and add | |
1974 // a corresponding NULL field's value if it is not recorded. | |
1975 // Connection Graph does not record a default initialization by NULL | |
1976 // captured by Initialize node. | |
1977 // | |
1978 uint null_idx = UseCompressedOops ? _noop_null : _oop_null; | |
1979 uint ae_cnt = pta->edge_count(); | |
1980 bool visited_bottom_offset = false; | |
1981 for (uint ei = 0; ei < ae_cnt; ei++) { | |
1982 uint nidx = pta->edge_target(ei); // Field (AddP) | |
1983 PointsToNode* ptn = ptnode_adr(nidx); | |
1984 assert(ptn->_node->is_AddP(), "Should be AddP nodes only"); | |
1985 int offset = ptn->offset(); | |
1986 if (offset == Type::OffsetBot) { | |
1987 if (!visited_bottom_offset) { | |
1988 visited_bottom_offset = true; | |
1989 // Check only oop fields. | |
1990 const Type* adr_type = ptn->_node->as_AddP()->bottom_type(); | |
1991 if (!adr_type->isa_aryptr() || | |
1992 (adr_type->isa_aryptr()->klass() == NULL) || | |
1993 adr_type->isa_aryptr()->klass()->is_obj_array_klass()) { | |
1994 // OffsetBot is used to reference array's element, | |
1995 // always add reference to NULL since we don't | |
1996 // known which element is referenced. | |
1997 add_edge_from_fields(alloc->_idx, null_idx, offset); | |
1998 } | |
1999 } | |
2000 } else if (offset != oopDesc::klass_offset_in_bytes() && | |
2001 !visited->test_set(offset)) { | |
2002 | |
2003 // Check only oop fields. | |
2004 const Type* adr_type = ptn->_node->as_AddP()->bottom_type(); | |
2005 BasicType basic_field_type = T_INT; | |
2006 if (adr_type->isa_instptr()) { | |
2007 ciField* field = C->alias_type(adr_type->isa_instptr())->field(); | |
2008 if (field != NULL) { | |
2009 basic_field_type = field->layout_type(); | |
2010 } else { | |
2011 // Ignore non field load (for example, klass load) | |
2012 } | |
2013 } else if (adr_type->isa_aryptr()) { | |
2014 if (offset != arrayOopDesc::length_offset_in_bytes()) { | |
2015 const Type* elemtype = adr_type->isa_aryptr()->elem(); | |
2016 basic_field_type = elemtype->array_element_basic_type(); | |
2017 } else { | |
2018 // Ignore array length load | |
2019 } | |
2020 #ifdef ASSERT | |
2021 } else { | |
2022 // Raw pointers are used for initializing stores so skip it | |
2023 // since it should be recorded already | |
2024 Node* base = get_addp_base(ptn->_node); | |
2025 assert(adr_type->isa_rawptr() && base->is_Proj() && | |
2026 (base->in(0) == alloc),"unexpected pointer type"); | |
2027 #endif | |
2028 } | |
2029 if (basic_field_type == T_OBJECT || | |
2030 basic_field_type == T_NARROWOOP || | |
2031 basic_field_type == T_ARRAY) { | |
2032 Node* value = NULL; | |
2033 if (ini != NULL) { | |
2034 BasicType ft = UseCompressedOops ? T_NARROWOOP : T_OBJECT; | |
2035 Node* store = ini->find_captured_store(offset, type2aelembytes(ft), phase); | |
2036 if (store != NULL && store->is_Store()) { | |
2037 value = store->in(MemNode::ValueIn); | |
2038 } else { | |
2039 // There could be initializing stores which follow allocation. | |
2040 // For example, a volatile field store is not collected | |
2041 // by Initialize node. | |
2042 // | |
2043 // Need to check for dependent loads to separate such stores from | |
2044 // stores which follow loads. For now, add initial value NULL so | |
2045 // that compare pointers optimization works correctly. | |
2046 } | |
2047 } | |
2048 if (value == NULL || value != ptnode_adr(value->_idx)->_node) { | |
2049 // A field's initializing value was not recorded. Add NULL. | |
2050 add_edge_from_fields(alloc->_idx, null_idx, offset); | |
2051 } | |
2052 } | |
2053 } | |
2054 } | |
2055 } | |
2056 | |
2057 // Adjust escape state after Connection Graph is built. | |
2058 void ConnectionGraph::adjust_escape_state(Node* n) { | |
2059 PointsToNode* ptn = ptnode_adr(n->_idx); | |
2060 assert(n->is_AddP(), "Should be called for AddP nodes only"); | |
2061 // Search for objects which are not scalar replaceable | |
2062 // and mark them to propagate the state to referenced objects. | |
2063 // | |
2064 | |
2065 int offset = ptn->offset(); | |
2066 Node* base = get_addp_base(n); | |
2067 VectorSet* ptset = PointsTo(base); | |
2068 int ptset_size = ptset->Size(); | |
2069 | |
2070 // An object is not scalar replaceable if the field which may point | |
2071 // to it has unknown offset (unknown element of an array of objects). | |
2072 // | |
2073 | |
2074 if (offset == Type::OffsetBot) { | |
2075 uint e_cnt = ptn->edge_count(); | |
2076 for (uint ei = 0; ei < e_cnt; ei++) { | |
2077 uint npi = ptn->edge_target(ei); | |
2078 ptnode_adr(npi)->set_scalar_replaceable(false); | |
2079 } | |
2080 } | |
2081 | |
2082 // Currently an object is not scalar replaceable if a LoadStore node | |
2083 // access its field since the field value is unknown after it. | |
2084 // | |
2085 bool has_LoadStore = false; | |
2086 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
2087 Node *use = n->fast_out(i); | |
2088 if (use->is_LoadStore()) { | |
2089 has_LoadStore = true; | |
2090 break; | |
2091 } | |
2092 } | |
2093 // An object is not scalar replaceable if the address points | |
2094 // to unknown field (unknown element for arrays, offset is OffsetBot). | |
2095 // | |
2096 // Or the address may point to more then one object. This may produce | |
2097 // the false positive result (set not scalar replaceable) | |
2098 // since the flow-insensitive escape analysis can't separate | |
2099 // the case when stores overwrite the field's value from the case | |
2100 // when stores happened on different control branches. | |
2101 // | |
2102 // Note: it will disable scalar replacement in some cases: | |
2103 // | |
2104 // Point p[] = new Point[1]; | |
2105 // p[0] = new Point(); // Will be not scalar replaced | |
2106 // | |
2107 // but it will save us from incorrect optimizations in next cases: | |
2108 // | |
2109 // Point p[] = new Point[1]; | |
2110 // if ( x ) p[0] = new Point(); // Will be not scalar replaced | |
2111 // | |
2112 if (ptset_size > 1 || ptset_size != 0 && | |
2113 (has_LoadStore || offset == Type::OffsetBot)) { | |
2114 for( VectorSetI j(ptset); j.test(); ++j ) { | |
2115 ptnode_adr(j.elem)->set_scalar_replaceable(false); | |
2116 } | |
2117 } | |
2118 } | |
2119 | |
2120 // Propagate escape states to referenced nodes. | |
2121 bool ConnectionGraph::propagate_escape_state(GrowableArray<int>* cg_worklist, | |
2122 GrowableArray<uint>* worklist, | |
2123 PointsToNode::EscapeState esc_state) { | |
2124 bool has_java_obj = false; | |
2125 | |
2126 // push all nodes with the same escape state on the worklist | |
2127 uint cg_length = cg_worklist->length(); | |
2128 for (uint next = 0; next < cg_length; ++next) { | |
2129 int nk = cg_worklist->at(next); | |
2130 if (ptnode_adr(nk)->escape_state() == esc_state) | |
2131 worklist->push(nk); | |
2132 } | |
2133 // mark all reachable nodes | |
2134 while (worklist->length() > 0) { | |
2135 int pt = worklist->pop(); | |
2136 PointsToNode* ptn = ptnode_adr(pt); | |
2137 if (ptn->node_type() == PointsToNode::JavaObject && | |
2138 !is_null_ptr(pt)) { | |
2139 has_java_obj = true; | |
2140 if (esc_state > PointsToNode::NoEscape) { | |
2141 // fields values are unknown if object escapes | |
2142 add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); | |
2143 } | |
2144 } | |
2145 uint e_cnt = ptn->edge_count(); | |
2146 for (uint ei = 0; ei < e_cnt; ei++) { | |
2147 uint npi = ptn->edge_target(ei); | |
2148 if (is_null_ptr(npi)) | |
2149 continue; | |
2150 PointsToNode *np = ptnode_adr(npi); | |
2151 if (np->escape_state() < esc_state) { | |
2152 set_escape_state(npi, esc_state); | |
2153 worklist->push(npi); | |
2154 } | |
2155 } | |
2156 } | |
2157 // Has not escaping java objects | |
2158 return has_java_obj && (esc_state < PointsToNode::GlobalEscape); | |
2159 } | |
2160 | |
2161 // Optimize objects compare. | |
2162 Node* ConnectionGraph::optimize_ptr_compare(Node* n) { | |
2163 assert(OptimizePtrCompare, "sanity"); | |
2164 // Clone returned Set since PointsTo() returns pointer | |
2165 // to the same structure ConnectionGraph.pt_ptset. | |
2166 VectorSet ptset1 = *PointsTo(n->in(1)); | |
2167 VectorSet ptset2 = *PointsTo(n->in(2)); | |
2168 | |
2169 // Check simple cases first. | |
2170 if (ptset1.Size() == 1) { | |
2171 uint pt1 = ptset1.getelem(); | |
2172 PointsToNode* ptn1 = ptnode_adr(pt1); | |
2173 if (ptn1->escape_state() == PointsToNode::NoEscape) { | |
2174 if (ptset2.Size() == 1 && ptset2.getelem() == pt1) { | |
2175 // Comparing the same not escaping object. | |
2176 return _pcmp_eq; | |
2177 } | |
2178 Node* obj = ptn1->_node; | |
2179 // Comparing not escaping allocation. | |
2180 if ((obj->is_Allocate() || obj->is_CallStaticJava()) && | |
2181 !ptset2.test(pt1)) { | |
2182 return _pcmp_neq; // This includes nullness check. | |
2183 } | |
2184 } | |
2185 } else if (ptset2.Size() == 1) { | |
2186 uint pt2 = ptset2.getelem(); | |
2187 PointsToNode* ptn2 = ptnode_adr(pt2); | |
2188 if (ptn2->escape_state() == PointsToNode::NoEscape) { | |
2189 Node* obj = ptn2->_node; | |
2190 // Comparing not escaping allocation. | |
2191 if ((obj->is_Allocate() || obj->is_CallStaticJava()) && | |
2192 !ptset1.test(pt2)) { | |
2193 return _pcmp_neq; // This includes nullness check. | |
2194 } | |
2195 } | |
2196 } | |
2197 | |
2198 if (!ptset1.disjoint(ptset2)) { | |
2199 return NULL; // Sets are not disjoint | |
2200 } | |
2201 | |
2202 // Sets are disjoint. | |
2203 bool set1_has_unknown_ptr = ptset1.test(_phantom_object) != 0; | |
2204 bool set2_has_unknown_ptr = ptset2.test(_phantom_object) != 0; | |
2205 bool set1_has_null_ptr = (ptset1.test(_oop_null) | ptset1.test(_noop_null)) != 0; | |
2206 bool set2_has_null_ptr = (ptset2.test(_oop_null) | ptset2.test(_noop_null)) != 0; | |
2207 | |
2208 if (set1_has_unknown_ptr && set2_has_null_ptr || | |
2209 set2_has_unknown_ptr && set1_has_null_ptr) { | |
2210 // Check nullness of unknown object. | |
2211 return NULL; | |
2212 } | |
2213 | |
2214 // Disjointness by itself is not sufficient since | |
2215 // alias analysis is not complete for escaped objects. | |
2216 // Disjoint sets are definitely unrelated only when | |
2217 // at least one set has only not escaping objects. | |
2218 if (!set1_has_unknown_ptr && !set1_has_null_ptr) { | |
2219 bool has_only_non_escaping_alloc = true; | |
2220 for (VectorSetI i(&ptset1); i.test(); ++i) { | |
2221 uint pt = i.elem; | |
2222 PointsToNode* ptn = ptnode_adr(pt); | |
2223 Node* obj = ptn->_node; | |
2224 if (ptn->escape_state() != PointsToNode::NoEscape || | |
2225 !(obj->is_Allocate() || obj->is_CallStaticJava())) { | |
2226 has_only_non_escaping_alloc = false; | |
2227 break; | |
2228 } | |
2229 } | |
2230 if (has_only_non_escaping_alloc) { | |
2231 return _pcmp_neq; | |
2232 } | |
2233 } | |
2234 if (!set2_has_unknown_ptr && !set2_has_null_ptr) { | |
2235 bool has_only_non_escaping_alloc = true; | |
2236 for (VectorSetI i(&ptset2); i.test(); ++i) { | |
2237 uint pt = i.elem; | |
2238 PointsToNode* ptn = ptnode_adr(pt); | |
2239 Node* obj = ptn->_node; | |
2240 if (ptn->escape_state() != PointsToNode::NoEscape || | |
2241 !(obj->is_Allocate() || obj->is_CallStaticJava())) { | |
2242 has_only_non_escaping_alloc = false; | |
2243 break; | |
2244 } | |
2245 } | |
2246 if (has_only_non_escaping_alloc) { | |
2247 return _pcmp_neq; | |
2248 } | |
2249 } | |
2250 return NULL; | |
2251 } | |
2252 | |
2253 void ConnectionGraph::process_call_arguments(CallNode *call, PhaseTransform *phase) { | |
2254 bool is_arraycopy = false; | |
2255 switch (call->Opcode()) { | |
2256 #ifdef ASSERT | |
2257 case Op_Allocate: | |
2258 case Op_AllocateArray: | |
2259 case Op_Lock: | |
2260 case Op_Unlock: | |
2261 assert(false, "should be done already"); | |
2262 break; | |
2263 #endif | |
2264 case Op_CallLeafNoFP: | |
2265 is_arraycopy = (call->as_CallLeaf()->_name != NULL && | |
2266 strstr(call->as_CallLeaf()->_name, "arraycopy") != 0); | |
2267 // fall through | |
2268 case Op_CallLeaf: | |
2269 { | |
2270 // Stub calls, objects do not escape but they are not scale replaceable. | |
2271 // Adjust escape state for outgoing arguments. | |
2272 const TypeTuple * d = call->tf()->domain(); | |
2273 bool src_has_oops = false; | |
2274 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
2275 const Type* at = d->field_at(i); | |
2276 Node *arg = call->in(i)->uncast(); | |
2277 const Type *aat = phase->type(arg); | |
2278 PointsToNode::EscapeState arg_esc = ptnode_adr(arg->_idx)->escape_state(); | |
2279 if (!arg->is_top() && at->isa_ptr() && aat->isa_ptr() && | |
2280 (is_arraycopy || arg_esc < PointsToNode::ArgEscape)) { | |
2281 #ifdef ASSERT | |
2282 assert(aat == Type::TOP || aat == TypePtr::NULL_PTR || | |
2283 aat->isa_ptr() != NULL, "expecting an Ptr"); | |
2284 if (!(is_arraycopy || | |
2285 call->as_CallLeaf()->_name != NULL && | |
2286 (strcmp(call->as_CallLeaf()->_name, "g1_wb_pre") == 0 || | |
2287 strcmp(call->as_CallLeaf()->_name, "g1_wb_post") == 0 )) | |
2288 ) { | |
2289 call->dump(); | |
2290 assert(false, "EA: unexpected CallLeaf"); | |
2291 } | |
2292 #endif | |
2293 if (arg_esc < PointsToNode::ArgEscape) { | |
2294 set_escape_state(arg->_idx, PointsToNode::ArgEscape); | |
2295 Node* arg_base = arg; | |
2296 if (arg->is_AddP()) { | |
2297 // | |
2298 // The inline_native_clone() case when the arraycopy stub is called | |
2299 // after the allocation before Initialize and CheckCastPP nodes. | |
2300 // Or normal arraycopy for object arrays case. | |
2301 // | |
2302 // Set AddP's base (Allocate) as not scalar replaceable since | |
2303 // pointer to the base (with offset) is passed as argument. | |
2304 // | |
2305 arg_base = get_addp_base(arg); | |
2306 set_escape_state(arg_base->_idx, PointsToNode::ArgEscape); | |
2307 } | |
2308 } | |
2309 | |
2310 bool arg_has_oops = aat->isa_oopptr() && | |
2311 (aat->isa_oopptr()->klass() == NULL || aat->isa_instptr() || | |
2312 (aat->isa_aryptr() && aat->isa_aryptr()->klass()->is_obj_array_klass())); | |
2313 if (i == TypeFunc::Parms) { | |
2314 src_has_oops = arg_has_oops; | |
2315 } | |
2316 // | |
2317 // src or dst could be j.l.Object when other is basic type array: | |
2318 // | |
2319 // arraycopy(char[],0,Object*,0,size); | |
2320 // arraycopy(Object*,0,char[],0,size); | |
2321 // | |
2322 // Do nothing special in such cases. | |
2323 // | |
2324 if (is_arraycopy && (i > TypeFunc::Parms) && | |
2325 src_has_oops && arg_has_oops) { | |
2326 // Destination object's fields reference an unknown object. | |
2327 Node* arg_base = arg; | |
2328 if (arg->is_AddP()) { | |
2329 arg_base = get_addp_base(arg); | |
2330 } | |
2331 for (VectorSetI s(PointsTo(arg_base)); s.test(); ++s) { | |
2332 uint ps = s.elem; | |
2333 set_escape_state(ps, PointsToNode::ArgEscape); | |
2334 add_edge_from_fields(ps, _phantom_object, Type::OffsetBot); | |
2335 } | |
2336 // Conservatively all values in source object fields globally escape | |
2337 // since we don't know if values in destination object fields | |
2338 // escape (it could be traced but it is too expensive). | |
2339 Node* src = call->in(TypeFunc::Parms)->uncast(); | |
2340 Node* src_base = src; | |
2341 if (src->is_AddP()) { | |
2342 src_base = get_addp_base(src); | |
2343 } | |
2344 for (VectorSetI s(PointsTo(src_base)); s.test(); ++s) { | |
2345 uint ps = s.elem; | |
2346 set_escape_state(ps, PointsToNode::ArgEscape); | |
2347 // Use OffsetTop to indicate fields global escape. | |
2348 add_edge_from_fields(ps, _phantom_object, Type::OffsetTop); | |
2349 } | |
2350 } | |
2351 } | |
2352 } | |
2353 break; | |
2354 } | |
2355 | |
2356 case Op_CallStaticJava: | |
2357 // For a static call, we know exactly what method is being called. | |
2358 // Use bytecode estimator to record the call's escape affects | |
2359 { | |
2360 ciMethod *meth = call->as_CallJava()->method(); | |
2361 BCEscapeAnalyzer *call_analyzer = (meth !=NULL) ? meth->get_bcea() : NULL; | |
2362 // fall-through if not a Java method or no analyzer information | |
2363 if (call_analyzer != NULL) { | |
2364 const TypeTuple * d = call->tf()->domain(); | |
2365 bool copy_dependencies = false; | |
2366 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
2367 const Type* at = d->field_at(i); | |
2368 int k = i - TypeFunc::Parms; | |
2369 Node *arg = call->in(i)->uncast(); | |
2370 | |
2371 if (at->isa_oopptr() != NULL && | |
2372 ptnode_adr(arg->_idx)->escape_state() < PointsToNode::GlobalEscape) { | |
2373 | |
2374 bool global_escapes = false; | |
2375 bool fields_escapes = false; | |
2376 if (!call_analyzer->is_arg_stack(k)) { | |
2377 // The argument global escapes, mark everything it could point to | |
2378 set_escape_state(arg->_idx, PointsToNode::GlobalEscape); | |
2379 global_escapes = true; | |
2380 } else { | |
2381 if (!call_analyzer->is_arg_local(k)) { | |
2382 // The argument itself doesn't escape, but any fields might | |
2383 fields_escapes = true; | |
2384 } | |
2385 set_escape_state(arg->_idx, PointsToNode::ArgEscape); | |
2386 copy_dependencies = true; | |
2387 } | |
2388 | |
2389 for( VectorSetI j(PointsTo(arg)); j.test(); ++j ) { | |
2390 uint pt = j.elem; | |
2391 if (global_escapes) { | |
2392 // The argument global escapes, mark everything it could point to | |
2393 set_escape_state(pt, PointsToNode::GlobalEscape); | |
2394 add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); | |
2395 } else { | |
2396 set_escape_state(pt, PointsToNode::ArgEscape); | |
2397 if (fields_escapes) { | |
2398 // The argument itself doesn't escape, but any fields might. | |
2399 // Use OffsetTop to indicate such case. | |
2400 add_edge_from_fields(pt, _phantom_object, Type::OffsetTop); | |
2401 } | |
2402 } | |
2403 } | |
2404 } | |
2405 } | |
2406 if (copy_dependencies) | |
2407 call_analyzer->copy_dependencies(_compile->dependencies()); | |
2408 break; | |
2409 } | |
2410 } | |
2411 | |
2412 default: | |
2413 // Fall-through here if not a Java method or no analyzer information | |
2414 // or some other type of call, assume the worst case: all arguments | |
2415 // globally escape. | |
2416 { | |
2417 // adjust escape state for outgoing arguments | |
2418 const TypeTuple * d = call->tf()->domain(); | |
2419 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
2420 const Type* at = d->field_at(i); | |
2421 if (at->isa_oopptr() != NULL) { | |
2422 Node *arg = call->in(i)->uncast(); | |
2423 set_escape_state(arg->_idx, PointsToNode::GlobalEscape); | |
2424 for( VectorSetI j(PointsTo(arg)); j.test(); ++j ) { | |
2425 uint pt = j.elem; | |
2426 set_escape_state(pt, PointsToNode::GlobalEscape); | |
2427 add_edge_from_fields(pt, _phantom_object, Type::OffsetBot); | |
2428 } | |
2429 } | |
2430 } | |
2431 } | |
2432 } | |
2433 } | |
2434 void ConnectionGraph::process_call_result(ProjNode *resproj, PhaseTransform *phase) { | |
2435 CallNode *call = resproj->in(0)->as_Call(); | |
2436 uint call_idx = call->_idx; | |
2437 uint resproj_idx = resproj->_idx; | |
2438 | |
2439 switch (call->Opcode()) { | |
2440 case Op_Allocate: | |
2441 { | |
2442 Node *k = call->in(AllocateNode::KlassNode); | |
2443 const TypeKlassPtr *kt = k->bottom_type()->isa_klassptr(); | |
2444 assert(kt != NULL, "TypeKlassPtr required."); | |
2445 ciKlass* cik = kt->klass(); | |
2446 | |
2447 PointsToNode::EscapeState es; | |
2448 uint edge_to; | |
2449 if (cik->is_subclass_of(_compile->env()->Thread_klass()) || | |
2450 !cik->is_instance_klass() || // StressReflectiveCode | |
2451 cik->as_instance_klass()->has_finalizer()) { | |
2452 es = PointsToNode::GlobalEscape; | |
2453 edge_to = _phantom_object; // Could not be worse | |
2454 } else { | |
2455 es = PointsToNode::NoEscape; | |
2456 edge_to = call_idx; | |
2457 assert(ptnode_adr(call_idx)->scalar_replaceable(), "sanity"); | |
2458 } | |
2459 set_escape_state(call_idx, es); | |
2460 add_pointsto_edge(resproj_idx, edge_to); | |
2461 _processed.set(resproj_idx); | |
2462 break; | |
2463 } | |
2464 | |
2465 case Op_AllocateArray: | |
2466 { | |
2467 | |
2468 Node *k = call->in(AllocateNode::KlassNode); | |
2469 const TypeKlassPtr *kt = k->bottom_type()->isa_klassptr(); | |
2470 assert(kt != NULL, "TypeKlassPtr required."); | |
2471 ciKlass* cik = kt->klass(); | |
2472 | |
2473 PointsToNode::EscapeState es; | |
2474 uint edge_to; | |
2475 if (!cik->is_array_klass()) { // StressReflectiveCode | |
2476 es = PointsToNode::GlobalEscape; | |
2477 edge_to = _phantom_object; | |
2478 } else { | |
2479 es = PointsToNode::NoEscape; | |
2480 edge_to = call_idx; | |
2481 assert(ptnode_adr(call_idx)->scalar_replaceable(), "sanity"); | |
2482 int length = call->in(AllocateNode::ALength)->find_int_con(-1); | |
2483 if (length < 0 || length > EliminateAllocationArraySizeLimit) { | |
2484 // Not scalar replaceable if the length is not constant or too big. | |
2485 ptnode_adr(call_idx)->set_scalar_replaceable(false); | |
2486 } | |
2487 } | |
2488 set_escape_state(call_idx, es); | |
2489 add_pointsto_edge(resproj_idx, edge_to); | |
2490 _processed.set(resproj_idx); | |
2491 break; | |
2492 } | |
2493 | |
2494 case Op_CallStaticJava: | |
2495 // For a static call, we know exactly what method is being called. | |
2496 // Use bytecode estimator to record whether the call's return value escapes | |
2497 { | |
2498 bool done = true; | |
2499 const TypeTuple *r = call->tf()->range(); | |
2500 const Type* ret_type = NULL; | |
2501 | |
2502 if (r->cnt() > TypeFunc::Parms) | |
2503 ret_type = r->field_at(TypeFunc::Parms); | |
2504 | |
2505 // Note: we use isa_ptr() instead of isa_oopptr() here because the | |
2506 // _multianewarray functions return a TypeRawPtr. | |
2507 if (ret_type == NULL || ret_type->isa_ptr() == NULL) { | |
2508 _processed.set(resproj_idx); | |
2509 break; // doesn't return a pointer type | |
2510 } | |
2511 ciMethod *meth = call->as_CallJava()->method(); | |
2512 const TypeTuple * d = call->tf()->domain(); | |
2513 if (meth == NULL) { | |
2514 // not a Java method, assume global escape | |
2515 set_escape_state(call_idx, PointsToNode::GlobalEscape); | |
2516 add_pointsto_edge(resproj_idx, _phantom_object); | |
2517 } else { | |
2518 BCEscapeAnalyzer *call_analyzer = meth->get_bcea(); | |
2519 bool copy_dependencies = false; | |
2520 | |
2521 if (call_analyzer->is_return_allocated()) { | |
2522 // Returns a newly allocated unescaped object, simply | |
2523 // update dependency information. | |
2524 // Mark it as NoEscape so that objects referenced by | |
2525 // it's fields will be marked as NoEscape at least. | |
2526 set_escape_state(call_idx, PointsToNode::NoEscape); | |
2527 ptnode_adr(call_idx)->set_scalar_replaceable(false); | |
2528 // Fields values are unknown | |
2529 add_edge_from_fields(call_idx, _phantom_object, Type::OffsetBot); | |
2530 add_pointsto_edge(resproj_idx, call_idx); | |
2531 copy_dependencies = true; | |
2532 } else { | |
2533 // determine whether any arguments are returned | |
2534 set_escape_state(call_idx, PointsToNode::ArgEscape); | |
2535 bool ret_arg = false; | |
2536 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
2537 const Type* at = d->field_at(i); | |
2538 if (at->isa_oopptr() != NULL) { | |
2539 Node *arg = call->in(i)->uncast(); | |
2540 | |
2541 if (call_analyzer->is_arg_returned(i - TypeFunc::Parms)) { | |
2542 ret_arg = true; | |
2543 PointsToNode *arg_esp = ptnode_adr(arg->_idx); | |
2544 if (arg_esp->node_type() == PointsToNode::UnknownType) | |
2545 done = false; | |
2546 else if (arg_esp->node_type() == PointsToNode::JavaObject) | |
2547 add_pointsto_edge(resproj_idx, arg->_idx); | |
2548 else | |
2549 add_deferred_edge(resproj_idx, arg->_idx); | |
2550 } | |
2551 } | |
2552 } | |
2553 if (done) { | |
2554 copy_dependencies = true; | |
2555 // is_return_local() is true when only arguments are returned. | |
2556 if (!ret_arg || !call_analyzer->is_return_local()) { | |
2557 // Returns unknown object. | |
2558 add_pointsto_edge(resproj_idx, _phantom_object); | |
2559 } | |
2560 } | |
2561 } | |
2562 if (copy_dependencies) | |
2563 call_analyzer->copy_dependencies(_compile->dependencies()); | |
2564 } | |
2565 if (done) | |
2566 _processed.set(resproj_idx); | |
2567 break; | |
2568 } | |
2569 | |
2570 default: | |
2571 // Some other type of call, assume the worst case that the | |
2572 // returned value, if any, globally escapes. | |
2573 { | |
2574 const TypeTuple *r = call->tf()->range(); | |
2575 if (r->cnt() > TypeFunc::Parms) { | |
2576 const Type* ret_type = r->field_at(TypeFunc::Parms); | |
2577 | |
2578 // Note: we use isa_ptr() instead of isa_oopptr() here because the | |
2579 // _multianewarray functions return a TypeRawPtr. | |
2580 if (ret_type->isa_ptr() != NULL) { | |
2581 set_escape_state(call_idx, PointsToNode::GlobalEscape); | |
2582 add_pointsto_edge(resproj_idx, _phantom_object); | |
2583 } | |
2584 } | |
2585 _processed.set(resproj_idx); | |
2586 } | |
2587 } | |
2588 } | |
2589 | |
2590 // Populate Connection Graph with Ideal nodes and create simple | |
2591 // connection graph edges (do not need to check the node_type of inputs | |
2592 // or to call PointsTo() to walk the connection graph). | |
2593 void ConnectionGraph::record_for_escape_analysis(Node *n, PhaseTransform *phase) { | |
2594 if (_processed.test(n->_idx)) | |
2595 return; // No need to redefine node's state. | |
2596 | |
2597 if (n->is_Call()) { | |
2598 // Arguments to allocation and locking don't escape. | |
2599 if (n->is_Allocate()) { | |
2600 add_node(n, PointsToNode::JavaObject, PointsToNode::UnknownEscape, true); | |
2601 record_for_optimizer(n); | |
2602 } else if (n->is_Lock() || n->is_Unlock()) { | |
2603 // Put Lock and Unlock nodes on IGVN worklist to process them during | |
2604 // the first IGVN optimization when escape information is still available. | |
2605 record_for_optimizer(n); | |
2606 _processed.set(n->_idx); | |
2607 } else { | |
2608 // Don't mark as processed since call's arguments have to be processed. | |
2609 PointsToNode::NodeType nt = PointsToNode::UnknownType; | |
2610 PointsToNode::EscapeState es = PointsToNode::UnknownEscape; | |
2611 | |
2612 // Check if a call returns an object. | |
2613 const TypeTuple *r = n->as_Call()->tf()->range(); | |
2614 if (r->cnt() > TypeFunc::Parms && | |
2615 r->field_at(TypeFunc::Parms)->isa_ptr() && | |
2616 n->as_Call()->proj_out(TypeFunc::Parms) != NULL) { | |
2617 nt = PointsToNode::JavaObject; | |
2618 if (!n->is_CallStaticJava()) { | |
2619 // Since the called mathod is statically unknown assume | |
2620 // the worst case that the returned value globally escapes. | |
2621 es = PointsToNode::GlobalEscape; | |
2622 } | |
2623 } | |
2624 add_node(n, nt, es, false); | |
2625 } | |
2626 return; | |
2627 } | |
2628 | |
2629 // Using isa_ptr() instead of isa_oopptr() for LoadP and Phi because | |
2630 // ThreadLocal has RawPrt type. | |
2631 switch (n->Opcode()) { | |
2632 case Op_AddP: | |
2633 { | |
2634 add_node(n, PointsToNode::Field, PointsToNode::UnknownEscape, false); | |
2635 break; | |
2636 } | |
2637 case Op_CastX2P: | |
2638 { // "Unsafe" memory access. | |
2639 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
2640 break; | |
2641 } | |
2642 case Op_CastPP: | |
2643 case Op_CheckCastPP: | |
2644 case Op_EncodeP: | |
2645 case Op_DecodeN: | |
2646 { | |
2647 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2648 int ti = n->in(1)->_idx; | |
2649 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); | |
2650 if (nt == PointsToNode::UnknownType) { | |
2651 _delayed_worklist.push(n); // Process it later. | |
2652 break; | |
2653 } else if (nt == PointsToNode::JavaObject) { | |
2654 add_pointsto_edge(n->_idx, ti); | |
2655 } else { | |
2656 add_deferred_edge(n->_idx, ti); | |
2657 } | |
2658 _processed.set(n->_idx); | |
2659 break; | |
2660 } | |
2661 case Op_ConP: | |
2662 { | |
2663 // assume all pointer constants globally escape except for null | |
2664 PointsToNode::EscapeState es; | |
2665 if (phase->type(n) == TypePtr::NULL_PTR) | |
2666 es = PointsToNode::NoEscape; | |
2667 else | |
2668 es = PointsToNode::GlobalEscape; | |
2669 | |
2670 add_node(n, PointsToNode::JavaObject, es, true); | |
2671 break; | |
2672 } | |
2673 case Op_ConN: | |
2674 { | |
2675 // assume all narrow oop constants globally escape except for null | |
2676 PointsToNode::EscapeState es; | |
2677 if (phase->type(n) == TypeNarrowOop::NULL_PTR) | |
2678 es = PointsToNode::NoEscape; | |
2679 else | |
2680 es = PointsToNode::GlobalEscape; | |
2681 | |
2682 add_node(n, PointsToNode::JavaObject, es, true); | |
2683 break; | |
2684 } | |
2685 case Op_CreateEx: | |
2686 { | |
2687 // assume that all exception objects globally escape | |
2688 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
2689 break; | |
2690 } | |
2691 case Op_LoadKlass: | |
2692 case Op_LoadNKlass: | |
2693 { | |
2694 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, true); | |
2695 break; | |
2696 } | |
2697 case Op_LoadP: | |
2698 case Op_LoadN: | |
2699 { | |
2700 const Type *t = phase->type(n); | |
2701 if (t->make_ptr() == NULL) { | |
2702 _processed.set(n->_idx); | |
2703 return; | |
2704 } | |
2705 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2706 break; | |
2707 } | |
2708 case Op_Parm: | |
2709 { | |
2710 _processed.set(n->_idx); // No need to redefine it state. | |
2711 uint con = n->as_Proj()->_con; | |
2712 if (con < TypeFunc::Parms) | |
2713 return; | |
2714 const Type *t = n->in(0)->as_Start()->_domain->field_at(con); | |
2715 if (t->isa_ptr() == NULL) | |
2716 return; | |
2717 // We have to assume all input parameters globally escape | |
2718 // (Note: passing 'false' since _processed is already set). | |
2719 add_node(n, PointsToNode::JavaObject, PointsToNode::GlobalEscape, false); | |
2720 break; | |
2721 } | |
2722 case Op_PartialSubtypeCheck: | |
2723 { // Produces Null or notNull and is used in CmpP. | |
2724 add_node(n, PointsToNode::JavaObject, PointsToNode::ArgEscape, true); | |
2725 break; | |
2726 } | |
2727 case Op_Phi: | |
2728 { | |
2729 const Type *t = n->as_Phi()->type(); | |
2730 if (t->make_ptr() == NULL) { | |
2731 // nothing to do if not an oop or narrow oop | |
2732 _processed.set(n->_idx); | |
2733 return; | |
2734 } | |
2735 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2736 uint i; | |
2737 for (i = 1; i < n->req() ; i++) { | |
2738 Node* in = n->in(i); | |
2739 if (in == NULL) | |
2740 continue; // ignore NULL | |
2741 in = in->uncast(); | |
2742 if (in->is_top() || in == n) | |
2743 continue; // ignore top or inputs which go back this node | |
2744 int ti = in->_idx; | |
2745 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); | |
2746 if (nt == PointsToNode::UnknownType) { | |
2747 break; | |
2748 } else if (nt == PointsToNode::JavaObject) { | |
2749 add_pointsto_edge(n->_idx, ti); | |
2750 } else { | |
2751 add_deferred_edge(n->_idx, ti); | |
2752 } | |
2753 } | |
2754 if (i >= n->req()) | |
2755 _processed.set(n->_idx); | |
2756 else | |
2757 _delayed_worklist.push(n); | |
2758 break; | |
2759 } | |
2760 case Op_Proj: | |
2761 { | |
2762 // we are only interested in the oop result projection from a call | |
2763 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { | |
2764 const TypeTuple *r = n->in(0)->as_Call()->tf()->range(); | |
2765 assert(r->cnt() > TypeFunc::Parms, "sanity"); | |
2766 if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) { | |
2767 add_node(n, PointsToNode::LocalVar, PointsToNode::UnknownEscape, false); | |
2768 int ti = n->in(0)->_idx; | |
2769 // The call may not be registered yet (since not all its inputs are registered) | |
2770 // if this is the projection from backbranch edge of Phi. | |
2771 if (ptnode_adr(ti)->node_type() != PointsToNode::UnknownType) { | |
2772 process_call_result(n->as_Proj(), phase); | |
2773 } | |
2774 if (!_processed.test(n->_idx)) { | |
2775 // The call's result may need to be processed later if the call | |
2776 // returns it's argument and the argument is not processed yet. | |
2777 _delayed_worklist.push(n); | |
2778 } | |
2779 break; | |
2780 } | |
2781 } | |
2782 _processed.set(n->_idx); | |
2783 break; | |
2784 } | |
2785 case Op_Return: | |
2786 { | |
2787 if( n->req() > TypeFunc::Parms && | |
2788 phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { | |
2789 // Treat Return value as LocalVar with GlobalEscape escape state. | |
2790 add_node(n, PointsToNode::LocalVar, PointsToNode::GlobalEscape, false); | |
2791 int ti = n->in(TypeFunc::Parms)->_idx; | |
2792 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); | |
2793 if (nt == PointsToNode::UnknownType) { | |
2794 _delayed_worklist.push(n); // Process it later. | |
2795 break; | |
2796 } else if (nt == PointsToNode::JavaObject) { | |
2797 add_pointsto_edge(n->_idx, ti); | |
2798 } else { | |
2799 add_deferred_edge(n->_idx, ti); | |
2800 } | |
2801 } | |
2802 _processed.set(n->_idx); | |
2803 break; | |
2804 } | |
2805 case Op_StoreP: | |
2806 case Op_StoreN: | |
2807 { | |
2808 const Type *adr_type = phase->type(n->in(MemNode::Address)); | |
2809 adr_type = adr_type->make_ptr(); | |
2810 if (adr_type->isa_oopptr()) { | |
2811 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2812 } else { | |
2813 Node* adr = n->in(MemNode::Address); | |
2814 if (adr->is_AddP() && phase->type(adr) == TypeRawPtr::NOTNULL && | |
2815 adr->in(AddPNode::Address)->is_Proj() && | |
2816 adr->in(AddPNode::Address)->in(0)->is_Allocate()) { | |
2817 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2818 // We are computing a raw address for a store captured | |
2819 // by an Initialize compute an appropriate address type. | |
2820 int offs = (int)phase->find_intptr_t_con(adr->in(AddPNode::Offset), Type::OffsetBot); | |
2821 assert(offs != Type::OffsetBot, "offset must be a constant"); | |
2822 } else { | |
2823 _processed.set(n->_idx); | |
2824 return; | |
2825 } | |
2826 } | |
2827 break; | |
2828 } | |
2829 case Op_StorePConditional: | |
2830 case Op_CompareAndSwapP: | |
2831 case Op_CompareAndSwapN: | |
2832 { | |
2833 const Type *adr_type = phase->type(n->in(MemNode::Address)); | |
2834 adr_type = adr_type->make_ptr(); | |
2835 if (adr_type->isa_oopptr()) { | |
2836 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2837 } else { | |
2838 _processed.set(n->_idx); | |
2839 return; | |
2840 } | |
2841 break; | |
2842 } | |
2843 case Op_AryEq: | |
2844 case Op_StrComp: | |
2845 case Op_StrEquals: | |
2846 case Op_StrIndexOf: | |
2847 { | |
2848 // char[] arrays passed to string intrinsics are not scalar replaceable. | |
2849 add_node(n, PointsToNode::UnknownType, PointsToNode::UnknownEscape, false); | |
2850 break; | |
2851 } | |
2852 case Op_ThreadLocal: | |
2853 { | |
2854 add_node(n, PointsToNode::JavaObject, PointsToNode::ArgEscape, true); | |
2855 break; | |
2856 } | |
2857 default: | |
2858 ; | |
2859 // nothing to do | |
2860 } | |
2861 return; | |
2862 } | |
2863 | |
2864 void ConnectionGraph::build_connection_graph(Node *n, PhaseTransform *phase) { | |
2865 uint n_idx = n->_idx; | |
2866 assert(ptnode_adr(n_idx)->_node != NULL, "node should be registered"); | |
2867 | |
2868 // Don't set processed bit for AddP, LoadP, StoreP since | |
2869 // they may need more then one pass to process. | |
2870 // Also don't mark as processed Call nodes since their | |
2871 // arguments may need more then one pass to process. | |
2872 if (_processed.test(n_idx)) | |
2873 return; // No need to redefine node's state. | |
2874 | |
2875 if (n->is_Call()) { | |
2876 CallNode *call = n->as_Call(); | |
2877 process_call_arguments(call, phase); | |
2878 return; | |
2879 } | |
2880 | |
2881 switch (n->Opcode()) { | |
2882 case Op_AddP: | |
2883 { | |
2884 Node *base = get_addp_base(n); | |
2885 int offset = address_offset(n, phase); | |
2886 // Create a field edge to this node from everything base could point to. | |
2887 for( VectorSetI i(PointsTo(base)); i.test(); ++i ) { | |
2888 uint pt = i.elem; | |
2889 add_field_edge(pt, n_idx, offset); | |
2890 } | |
2891 break; | |
2892 } | |
2893 case Op_CastX2P: | |
2894 { | |
2895 assert(false, "Op_CastX2P"); | |
2896 break; | |
2897 } | |
2898 case Op_CastPP: | |
2899 case Op_CheckCastPP: | |
2900 case Op_EncodeP: | |
2901 case Op_DecodeN: | |
2902 { | |
2903 int ti = n->in(1)->_idx; | |
2904 assert(ptnode_adr(ti)->node_type() != PointsToNode::UnknownType, "all nodes should be registered"); | |
2905 if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) { | |
2906 add_pointsto_edge(n_idx, ti); | |
2907 } else { | |
2908 add_deferred_edge(n_idx, ti); | |
2909 } | |
2910 _processed.set(n_idx); | |
2911 break; | |
2912 } | |
2913 case Op_ConP: | |
2914 { | |
2915 assert(false, "Op_ConP"); | |
2916 break; | |
2917 } | |
2918 case Op_ConN: | |
2919 { | |
2920 assert(false, "Op_ConN"); | |
2921 break; | |
2922 } | |
2923 case Op_CreateEx: | |
2924 { | |
2925 assert(false, "Op_CreateEx"); | |
2926 break; | |
2927 } | |
2928 case Op_LoadKlass: | |
2929 case Op_LoadNKlass: | |
2930 { | |
2931 assert(false, "Op_LoadKlass"); | |
2932 break; | |
2933 } | |
2934 case Op_LoadP: | |
2935 case Op_LoadN: | |
2936 { | |
2937 const Type *t = phase->type(n); | |
2938 #ifdef ASSERT | |
2939 if (t->make_ptr() == NULL) | |
2940 assert(false, "Op_LoadP"); | |
2941 #endif | |
2942 | |
2943 Node* adr = n->in(MemNode::Address)->uncast(); | |
2944 Node* adr_base; | |
2945 if (adr->is_AddP()) { | |
2946 adr_base = get_addp_base(adr); | |
2947 } else { | |
2948 adr_base = adr; | |
2949 } | |
2950 | |
2951 // For everything "adr_base" could point to, create a deferred edge from | |
2952 // this node to each field with the same offset. | |
2953 int offset = address_offset(adr, phase); | |
2954 for( VectorSetI i(PointsTo(adr_base)); i.test(); ++i ) { | |
2955 uint pt = i.elem; | |
2956 if (adr->is_AddP()) { | |
2957 // Add field edge if it is missing. | |
2958 add_field_edge(pt, adr->_idx, offset); | |
2959 } | |
2960 add_deferred_edge_to_fields(n_idx, pt, offset); | |
2961 } | |
2962 break; | |
2963 } | |
2964 case Op_Parm: | |
2965 { | |
2966 assert(false, "Op_Parm"); | |
2967 break; | |
2968 } | |
2969 case Op_PartialSubtypeCheck: | |
2970 { | |
2971 assert(false, "Op_PartialSubtypeCheck"); | |
2972 break; | |
2973 } | |
2974 case Op_Phi: | |
2975 { | |
2976 #ifdef ASSERT | |
2977 const Type *t = n->as_Phi()->type(); | |
2978 if (t->make_ptr() == NULL) | |
2979 assert(false, "Op_Phi"); | |
2980 #endif | |
2981 for (uint i = 1; i < n->req() ; i++) { | |
2982 Node* in = n->in(i); | |
2983 if (in == NULL) | |
2984 continue; // ignore NULL | |
2985 in = in->uncast(); | |
2986 if (in->is_top() || in == n) | |
2987 continue; // ignore top or inputs which go back this node | |
2988 int ti = in->_idx; | |
2989 PointsToNode::NodeType nt = ptnode_adr(ti)->node_type(); | |
2990 assert(nt != PointsToNode::UnknownType, "all nodes should be known"); | |
2991 if (nt == PointsToNode::JavaObject) { | |
2992 add_pointsto_edge(n_idx, ti); | |
2993 } else { | |
2994 add_deferred_edge(n_idx, ti); | |
2995 } | |
2996 } | |
2997 _processed.set(n_idx); | |
2998 break; | |
2999 } | |
3000 case Op_Proj: | |
3001 { | |
3002 // we are only interested in the oop result projection from a call | |
3003 if (n->as_Proj()->_con == TypeFunc::Parms && n->in(0)->is_Call() ) { | |
3004 assert(ptnode_adr(n->in(0)->_idx)->node_type() != PointsToNode::UnknownType, | |
3005 "all nodes should be registered"); | |
3006 const TypeTuple *r = n->in(0)->as_Call()->tf()->range(); | |
3007 assert(r->cnt() > TypeFunc::Parms, "sanity"); | |
3008 if (r->field_at(TypeFunc::Parms)->isa_ptr() != NULL) { | |
3009 process_call_result(n->as_Proj(), phase); | |
3010 assert(_processed.test(n_idx), "all call results should be processed"); | |
3011 break; | |
3012 } | |
3013 } | |
3014 assert(false, "Op_Proj"); | |
3015 break; | |
3016 } | |
3017 case Op_Return: | |
3018 { | |
3019 #ifdef ASSERT | |
3020 if( n->req() <= TypeFunc::Parms || | |
3021 !phase->type(n->in(TypeFunc::Parms))->isa_oopptr() ) { | |
3022 assert(false, "Op_Return"); | |
3023 } | |
3024 #endif | |
3025 int ti = n->in(TypeFunc::Parms)->_idx; | |
3026 assert(ptnode_adr(ti)->node_type() != PointsToNode::UnknownType, "node should be registered"); | |
3027 if (ptnode_adr(ti)->node_type() == PointsToNode::JavaObject) { | |
3028 add_pointsto_edge(n_idx, ti); | |
3029 } else { | |
3030 add_deferred_edge(n_idx, ti); | |
3031 } | |
3032 _processed.set(n_idx); | |
3033 break; | |
3034 } | |
3035 case Op_StoreP: | |
3036 case Op_StoreN: | |
3037 case Op_StorePConditional: | |
3038 case Op_CompareAndSwapP: | |
3039 case Op_CompareAndSwapN: | |
3040 { | |
3041 Node *adr = n->in(MemNode::Address); | |
3042 const Type *adr_type = phase->type(adr)->make_ptr(); | |
3043 #ifdef ASSERT | |
3044 if (!adr_type->isa_oopptr()) | |
3045 assert(phase->type(adr) == TypeRawPtr::NOTNULL, "Op_StoreP"); | |
3046 #endif | |
3047 | |
3048 assert(adr->is_AddP(), "expecting an AddP"); | |
3049 Node *adr_base = get_addp_base(adr); | |
3050 Node *val = n->in(MemNode::ValueIn)->uncast(); | |
3051 int offset = address_offset(adr, phase); | |
3052 // For everything "adr_base" could point to, create a deferred edge | |
3053 // to "val" from each field with the same offset. | |
3054 for( VectorSetI i(PointsTo(adr_base)); i.test(); ++i ) { | |
3055 uint pt = i.elem; | |
3056 // Add field edge if it is missing. | |
3057 add_field_edge(pt, adr->_idx, offset); | |
3058 add_edge_from_fields(pt, val->_idx, offset); | |
3059 } | |
3060 break; | |
3061 } | |
3062 case Op_AryEq: | |
3063 case Op_StrComp: | |
3064 case Op_StrEquals: | |
3065 case Op_StrIndexOf: | |
3066 { | |
3067 // char[] arrays passed to string intrinsic do not escape but | |
3068 // they are not scalar replaceable. Adjust escape state for them. | |
3069 // Start from in(2) edge since in(1) is memory edge. | |
3070 for (uint i = 2; i < n->req(); i++) { | |
3071 Node* adr = n->in(i)->uncast(); | |
3072 const Type *at = phase->type(adr); | |
3073 if (!adr->is_top() && at->isa_ptr()) { | |
3074 assert(at == Type::TOP || at == TypePtr::NULL_PTR || | |
3075 at->isa_ptr() != NULL, "expecting an Ptr"); | |
3076 if (adr->is_AddP()) { | |
3077 adr = get_addp_base(adr); | |
3078 } | |
3079 // Mark as ArgEscape everything "adr" could point to. | |
3080 set_escape_state(adr->_idx, PointsToNode::ArgEscape); | |
3081 } | |
3082 } | |
3083 _processed.set(n_idx); | |
3084 break; | |
3085 } | |
3086 case Op_ThreadLocal: | |
3087 { | |
3088 assert(false, "Op_ThreadLocal"); | |
3089 break; | |
3090 } | |
3091 default: | |
3092 // This method should be called only for EA specific nodes. | |
3093 ShouldNotReachHere(); | |
3094 } | |
3095 } | |
3096 | |
3097 #ifndef PRODUCT | |
3098 void ConnectionGraph::dump() { | |
3099 bool first = true; | 3087 bool first = true; |
3100 | 3088 int ptnodes_length = ptnodes_worklist.length(); |
3101 uint size = nodes_size(); | 3089 for (int i = 0; i < ptnodes_length; i++) { |
3102 for (uint ni = 0; ni < size; ni++) { | 3090 PointsToNode *ptn = ptnodes_worklist.at(i); |
3103 PointsToNode *ptn = ptnode_adr(ni); | 3091 if (ptn == NULL || !ptn->is_JavaObject()) |
3104 PointsToNode::NodeType ptn_type = ptn->node_type(); | |
3105 | |
3106 if (ptn_type != PointsToNode::JavaObject || ptn->_node == NULL) | |
3107 continue; | 3092 continue; |
3108 PointsToNode::EscapeState es = escape_state(ptn->_node); | 3093 PointsToNode::EscapeState es = ptn->escape_state(); |
3109 if (ptn->_node->is_Allocate() && (es == PointsToNode::NoEscape || Verbose)) { | 3094 if (ptn->ideal_node()->is_Allocate() && (es == PointsToNode::NoEscape || Verbose)) { |
3110 if (first) { | 3095 if (first) { |
3111 tty->cr(); | 3096 tty->cr(); |
3112 tty->print("======== Connection graph for "); | 3097 tty->print("======== Connection graph for "); |
3113 _compile->method()->print_short_name(); | 3098 _compile->method()->print_short_name(); |
3114 tty->cr(); | 3099 tty->cr(); |
3115 first = false; | 3100 first = false; |
3116 } | 3101 } |
3117 tty->print("%6d ", ni); | |
3118 ptn->dump(); | 3102 ptn->dump(); |
3119 // Print all locals which reference this allocation | 3103 // Print all locals and fields which reference this allocation |
3120 for (uint li = ni; li < size; li++) { | 3104 for (UseIterator j(ptn); j.has_next(); j.next()) { |
3121 PointsToNode *ptn_loc = ptnode_adr(li); | 3105 PointsToNode* use = j.get(); |
3122 PointsToNode::NodeType ptn_loc_type = ptn_loc->node_type(); | 3106 if (use->is_LocalVar()) { |
3123 if ( ptn_loc_type == PointsToNode::LocalVar && ptn_loc->_node != NULL && | 3107 use->dump(Verbose); |
3124 ptn_loc->edge_count() == 1 && ptn_loc->edge_target(0) == ni ) { | 3108 } else if (Verbose) { |
3125 ptnode_adr(li)->dump(false); | 3109 use->dump(); |
3126 } | |
3127 } | |
3128 if (Verbose) { | |
3129 // Print all fields which reference this allocation | |
3130 for (uint i = 0; i < ptn->edge_count(); i++) { | |
3131 uint ei = ptn->edge_target(i); | |
3132 ptnode_adr(ei)->dump(false); | |
3133 } | 3110 } |
3134 } | 3111 } |
3135 tty->cr(); | 3112 tty->cr(); |
3136 } | 3113 } |
3137 } | 3114 } |