Mercurial > hg > truffle
annotate src/share/vm/opto/phaseX.hpp @ 176:6b648fefb395
6705523: Fix for 6695506 will violate spec when used in JDK6
Summary: Make max classfile version number dependent on JDK version
Reviewed-by: acorn, never
author | kamg |
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date | Thu, 22 May 2008 13:03:52 -0400 |
parents | ba764ed4b6f2 |
children | d1605aabd0a1 |
rev | line source |
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0 | 1 /* |
2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class Compile; | |
26 class ConINode; | |
27 class ConLNode; | |
28 class Node; | |
29 class Type; | |
30 class PhaseTransform; | |
31 class PhaseGVN; | |
32 class PhaseIterGVN; | |
33 class PhaseCCP; | |
34 class PhasePeephole; | |
35 class PhaseRegAlloc; | |
36 | |
37 | |
38 //----------------------------------------------------------------------------- | |
39 // Expandable closed hash-table of nodes, initialized to NULL. | |
40 // Note that the constructor just zeros things | |
41 // Storage is reclaimed when the Arena's lifetime is over. | |
42 class NodeHash : public StackObj { | |
43 protected: | |
44 Arena *_a; // Arena to allocate in | |
45 uint _max; // Size of table (power of 2) | |
46 uint _inserts; // For grow and debug, count of hash_inserts | |
47 uint _insert_limit; // 'grow' when _inserts reaches _insert_limit | |
48 Node **_table; // Hash table of Node pointers | |
49 Node *_sentinel; // Replaces deleted entries in hash table | |
50 | |
51 public: | |
52 NodeHash(uint est_max_size); | |
53 NodeHash(Arena *arena, uint est_max_size); | |
54 NodeHash(NodeHash *use_this_state); | |
55 #ifdef ASSERT | |
56 ~NodeHash(); // Unlock all nodes upon destruction of table. | |
57 void operator=(const NodeHash&); // Unlock all nodes upon replacement of table. | |
58 #endif | |
59 Node *hash_find(const Node*);// Find an equivalent version in hash table | |
60 Node *hash_find_insert(Node*);// If not in table insert else return found node | |
61 void hash_insert(Node*); // Insert into hash table | |
62 bool hash_delete(const Node*);// Replace with _sentinel in hash table | |
63 void check_grow() { | |
64 _inserts++; | |
65 if( _inserts == _insert_limit ) { grow(); } | |
66 assert( _inserts <= _insert_limit, "hash table overflow"); | |
67 assert( _inserts < _max, "hash table overflow" ); | |
68 } | |
69 static uint round_up(uint); // Round up to nearest power of 2 | |
70 void grow(); // Grow _table to next power of 2 and rehash | |
71 // Return 75% of _max, rounded up. | |
72 uint insert_limit() const { return _max - (_max>>2); } | |
73 | |
74 void clear(); // Set all entries to NULL, keep storage. | |
75 // Size of hash table | |
76 uint size() const { return _max; } | |
77 // Return Node* at index in table | |
78 Node *at(uint table_index) { | |
79 assert(table_index < _max, "Must be within table"); | |
80 return _table[table_index]; | |
81 } | |
82 | |
83 void remove_useless_nodes(VectorSet &useful); // replace with sentinel | |
84 | |
85 Node *sentinel() { return _sentinel; } | |
86 | |
87 #ifndef PRODUCT | |
88 Node *find_index(uint idx); // For debugging | |
89 void dump(); // For debugging, dump statistics | |
90 #endif | |
91 uint _grows; // For debugging, count of table grow()s | |
92 uint _look_probes; // For debugging, count of hash probes | |
93 uint _lookup_hits; // For debugging, count of hash_finds | |
94 uint _lookup_misses; // For debugging, count of hash_finds | |
95 uint _insert_probes; // For debugging, count of hash probes | |
96 uint _delete_probes; // For debugging, count of hash probes for deletes | |
97 uint _delete_hits; // For debugging, count of hash probes for deletes | |
98 uint _delete_misses; // For debugging, count of hash probes for deletes | |
99 uint _total_inserts; // For debugging, total inserts into hash table | |
100 uint _total_insert_probes; // For debugging, total probes while inserting | |
101 }; | |
102 | |
103 | |
104 //----------------------------------------------------------------------------- | |
105 // Map dense integer indices to Types. Uses classic doubling-array trick. | |
106 // Abstractly provides an infinite array of Type*'s, initialized to NULL. | |
107 // Note that the constructor just zeros things, and since I use Arena | |
108 // allocation I do not need a destructor to reclaim storage. | |
109 // Despite the general name, this class is customized for use by PhaseTransform. | |
110 class Type_Array : public StackObj { | |
111 Arena *_a; // Arena to allocate in | |
112 uint _max; | |
113 const Type **_types; | |
114 void grow( uint i ); // Grow array node to fit | |
115 const Type *operator[] ( uint i ) const // Lookup, or NULL for not mapped | |
116 { return (i<_max) ? _types[i] : (Type*)NULL; } | |
117 friend class PhaseTransform; | |
118 public: | |
119 Type_Array(Arena *a) : _a(a), _max(0), _types(0) {} | |
120 Type_Array(Type_Array *ta) : _a(ta->_a), _max(ta->_max), _types(ta->_types) { } | |
121 const Type *fast_lookup(uint i) const{assert(i<_max,"oob");return _types[i];} | |
122 // Extend the mapping: index i maps to Type *n. | |
123 void map( uint i, const Type *n ) { if( i>=_max ) grow(i); _types[i] = n; } | |
124 uint Size() const { return _max; } | |
125 #ifndef PRODUCT | |
126 void dump() const; | |
127 #endif | |
128 }; | |
129 | |
130 | |
131 //------------------------------PhaseRemoveUseless----------------------------- | |
132 // Remove useless nodes from GVN hash-table, worklist, and graph | |
133 class PhaseRemoveUseless : public Phase { | |
134 protected: | |
135 Unique_Node_List _useful; // Nodes reachable from root | |
136 // list is allocated from current resource area | |
137 public: | |
138 PhaseRemoveUseless( PhaseGVN *gvn, Unique_Node_List *worklist ); | |
139 | |
140 Unique_Node_List *get_useful() { return &_useful; } | |
141 }; | |
142 | |
143 | |
144 //------------------------------PhaseTransform--------------------------------- | |
145 // Phases that analyze, then transform. Constructing the Phase object does any | |
146 // global or slow analysis. The results are cached later for a fast | |
147 // transformation pass. When the Phase object is deleted the cached analysis | |
148 // results are deleted. | |
149 class PhaseTransform : public Phase { | |
150 protected: | |
151 Arena* _arena; | |
152 Node_Array _nodes; // Map old node indices to new nodes. | |
153 Type_Array _types; // Map old node indices to Types. | |
154 | |
155 // ConNode caches: | |
156 enum { _icon_min = -1 * HeapWordSize, | |
157 _icon_max = 16 * HeapWordSize, | |
158 _lcon_min = _icon_min, | |
159 _lcon_max = _icon_max, | |
160 _zcon_max = (uint)T_CONFLICT | |
161 }; | |
162 ConINode* _icons[_icon_max - _icon_min + 1]; // cached jint constant nodes | |
163 ConLNode* _lcons[_lcon_max - _lcon_min + 1]; // cached jlong constant nodes | |
164 ConNode* _zcons[_zcon_max + 1]; // cached is_zero_type nodes | |
165 void init_con_caches(); | |
166 | |
167 // Support both int and long caches because either might be an intptr_t, | |
168 // so they show up frequently in address computations. | |
169 | |
170 public: | |
171 PhaseTransform( PhaseNumber pnum ); | |
172 PhaseTransform( Arena *arena, PhaseNumber pnum ); | |
173 PhaseTransform( PhaseTransform *phase, PhaseNumber pnum ); | |
174 | |
175 Arena* arena() { return _arena; } | |
176 Type_Array& types() { return _types; } | |
177 // _nodes is used in varying ways by subclasses, which define local accessors | |
178 | |
179 public: | |
180 // Get a previously recorded type for the node n. | |
181 // This type must already have been recorded. | |
182 // If you want the type of a very new (untransformed) node, | |
183 // you must use type_or_null, and test the result for NULL. | |
184 const Type* type(const Node* n) const { | |
185 const Type* t = _types.fast_lookup(n->_idx); | |
186 assert(t != NULL, "must set before get"); | |
187 return t; | |
188 } | |
189 // Get a previously recorded type for the node n, | |
190 // or else return NULL if there is none. | |
191 const Type* type_or_null(const Node* n) const { | |
192 return _types.fast_lookup(n->_idx); | |
193 } | |
194 // Record a type for a node. | |
195 void set_type(const Node* n, const Type *t) { | |
196 assert(t != NULL, "type must not be null"); | |
197 _types.map(n->_idx, t); | |
198 } | |
199 // Record an initial type for a node, the node's bottom type. | |
200 void set_type_bottom(const Node* n) { | |
201 // Use this for initialization when bottom_type() (or better) is not handy. | |
202 // Usually the initialization shoudl be to n->Value(this) instead, | |
203 // or a hand-optimized value like Type::MEMORY or Type::CONTROL. | |
204 assert(_types[n->_idx] == NULL, "must set the initial type just once"); | |
205 _types.map(n->_idx, n->bottom_type()); | |
206 } | |
207 // Make sure the types array is big enough to record a size for the node n. | |
208 // (In product builds, we never want to do range checks on the types array!) | |
209 void ensure_type_or_null(const Node* n) { | |
210 if (n->_idx >= _types.Size()) | |
211 _types.map(n->_idx, NULL); // Grow the types array as needed. | |
212 } | |
213 | |
214 // Utility functions: | |
215 const TypeInt* find_int_type( Node* n); | |
216 const TypeLong* find_long_type(Node* n); | |
217 jint find_int_con( Node* n, jint value_if_unknown) { | |
218 const TypeInt* t = find_int_type(n); | |
219 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; | |
220 } | |
221 jlong find_long_con(Node* n, jlong value_if_unknown) { | |
222 const TypeLong* t = find_long_type(n); | |
223 return (t != NULL && t->is_con()) ? t->get_con() : value_if_unknown; | |
224 } | |
225 | |
226 // Make an idealized constant, i.e., one of ConINode, ConPNode, ConFNode, etc. | |
227 // Same as transform(ConNode::make(t)). | |
228 ConNode* makecon(const Type* t); | |
229 virtual ConNode* uncached_makecon(const Type* t) // override in PhaseValues | |
230 { ShouldNotCallThis(); return NULL; } | |
231 | |
232 // Fast int or long constant. Same as TypeInt::make(i) or TypeLong::make(l). | |
233 ConINode* intcon(jint i); | |
234 ConLNode* longcon(jlong l); | |
235 | |
236 // Fast zero or null constant. Same as makecon(Type::get_zero_type(bt)). | |
237 ConNode* zerocon(BasicType bt); | |
238 | |
239 // Return a node which computes the same function as this node, but | |
240 // in a faster or cheaper fashion. | |
241 virtual Node *transform( Node *n ) = 0; | |
242 | |
243 // Return whether two Nodes are equivalent. | |
244 // Must not be recursive, since the recursive version is built from this. | |
245 // For pessimistic optimizations this is simply pointer equivalence. | |
246 bool eqv(const Node* n1, const Node* n2) const { return n1 == n2; } | |
247 | |
248 // Return whether two Nodes are equivalent, after stripping casting. | |
249 bool eqv_uncast(const Node* n1, const Node* n2) const { | |
250 return eqv(n1->uncast(), n2->uncast()); | |
251 } | |
252 | |
253 // For pessimistic passes, the return type must monotonically narrow. | |
254 // For optimistic passes, the return type must monotonically widen. | |
255 // It is possible to get into a "death march" in either type of pass, | |
256 // where the types are continually moving but it will take 2**31 or | |
257 // more steps to converge. This doesn't happen on most normal loops. | |
258 // | |
259 // Here is an example of a deadly loop for an optimistic pass, along | |
260 // with a partial trace of inferred types: | |
261 // x = phi(0,x'); L: x' = x+1; if (x' >= 0) goto L; | |
262 // 0 1 join([0..max], 1) | |
263 // [0..1] [1..2] join([0..max], [1..2]) | |
264 // [0..2] [1..3] join([0..max], [1..3]) | |
265 // ... ... ... | |
266 // [0..max] [min]u[1..max] join([0..max], [min..max]) | |
267 // [0..max] ==> fixpoint | |
268 // We would have proven, the hard way, that the iteration space is all | |
269 // non-negative ints, with the loop terminating due to 32-bit overflow. | |
270 // | |
271 // Here is the corresponding example for a pessimistic pass: | |
272 // x = phi(0,x'); L: x' = x-1; if (x' >= 0) goto L; | |
273 // int int join([0..max], int) | |
274 // [0..max] [-1..max-1] join([0..max], [-1..max-1]) | |
275 // [0..max-1] [-1..max-2] join([0..max], [-1..max-2]) | |
276 // ... ... ... | |
277 // [0..1] [-1..0] join([0..max], [-1..0]) | |
278 // 0 -1 join([0..max], -1) | |
279 // 0 == fixpoint | |
280 // We would have proven, the hard way, that the iteration space is {0}. | |
281 // (Usually, other optimizations will make the "if (x >= 0)" fold up | |
282 // before we get into trouble. But not always.) | |
283 // | |
284 // It's a pleasant thing to observe that the pessimistic pass | |
285 // will make short work of the optimistic pass's deadly loop, | |
286 // and vice versa. That is a good example of the complementary | |
287 // purposes of the CCP (optimistic) vs. GVN (pessimistic) phases. | |
288 // | |
289 // In any case, only widen or narrow a few times before going to the | |
290 // correct flavor of top or bottom. | |
291 // | |
292 // This call only needs to be made once as the data flows around any | |
293 // given cycle. We do it at Phis, and nowhere else. | |
294 // The types presented are the new type of a phi (computed by PhiNode::Value) | |
295 // and the previously computed type, last time the phi was visited. | |
296 // | |
297 // The third argument is upper limit for the saturated value, | |
298 // if the phase wishes to widen the new_type. | |
299 // If the phase is narrowing, the old type provides a lower limit. | |
300 // Caller guarantees that old_type and new_type are no higher than limit_type. | |
301 virtual const Type* saturate(const Type* new_type, const Type* old_type, | |
302 const Type* limit_type) const | |
303 { ShouldNotCallThis(); return NULL; } | |
304 | |
305 #ifndef PRODUCT | |
306 void dump_old2new_map() const; | |
307 void dump_new( uint new_lidx ) const; | |
308 void dump_types() const; | |
309 void dump_nodes_and_types(const Node *root, uint depth, bool only_ctrl = true); | |
310 void dump_nodes_and_types_recur( const Node *n, uint depth, bool only_ctrl, VectorSet &visited); | |
311 | |
312 uint _count_progress; // For profiling, count transforms that make progress | |
313 void set_progress() { ++_count_progress; assert( allow_progress(),"No progress allowed during verification") } | |
314 void clear_progress() { _count_progress = 0; } | |
315 uint made_progress() const { return _count_progress; } | |
316 | |
317 uint _count_transforms; // For profiling, count transforms performed | |
318 void set_transforms() { ++_count_transforms; } | |
319 void clear_transforms() { _count_transforms = 0; } | |
320 uint made_transforms() const{ return _count_transforms; } | |
321 | |
322 bool _allow_progress; // progress not allowed during verification pass | |
323 void set_allow_progress(bool allow) { _allow_progress = allow; } | |
324 bool allow_progress() { return _allow_progress; } | |
325 #endif | |
326 }; | |
327 | |
328 //------------------------------PhaseValues------------------------------------ | |
329 // Phase infrastructure to support values | |
330 class PhaseValues : public PhaseTransform { | |
331 protected: | |
332 NodeHash _table; // Hash table for value-numbering | |
333 | |
334 public: | |
335 PhaseValues( Arena *arena, uint est_max_size ); | |
336 PhaseValues( PhaseValues *pt ); | |
337 PhaseValues( PhaseValues *ptv, const char *dummy ); | |
338 NOT_PRODUCT( ~PhaseValues(); ) | |
339 virtual PhaseIterGVN *is_IterGVN() { return 0; } | |
340 | |
341 // Some Ideal and other transforms delete --> modify --> insert values | |
342 bool hash_delete(Node *n) { return _table.hash_delete(n); } | |
343 void hash_insert(Node *n) { _table.hash_insert(n); } | |
344 Node *hash_find_insert(Node *n){ return _table.hash_find_insert(n); } | |
345 Node *hash_find(const Node *n) { return _table.hash_find(n); } | |
346 | |
347 // Used after parsing to eliminate values that are no longer in program | |
348 void remove_useless_nodes(VectorSet &useful) { _table.remove_useless_nodes(useful); } | |
349 | |
350 virtual ConNode* uncached_makecon(const Type* t); // override from PhaseTransform | |
351 | |
352 virtual const Type* saturate(const Type* new_type, const Type* old_type, | |
353 const Type* limit_type) const | |
354 { return new_type; } | |
355 | |
356 #ifndef PRODUCT | |
357 uint _count_new_values; // For profiling, count new values produced | |
358 void inc_new_values() { ++_count_new_values; } | |
359 void clear_new_values() { _count_new_values = 0; } | |
360 uint made_new_values() const { return _count_new_values; } | |
361 #endif | |
362 }; | |
363 | |
364 | |
365 //------------------------------PhaseGVN--------------------------------------- | |
366 // Phase for performing local, pessimistic GVN-style optimizations. | |
367 class PhaseGVN : public PhaseValues { | |
368 public: | |
369 PhaseGVN( Arena *arena, uint est_max_size ) : PhaseValues( arena, est_max_size ) {} | |
370 PhaseGVN( PhaseGVN *gvn ) : PhaseValues( gvn ) {} | |
371 PhaseGVN( PhaseGVN *gvn, const char *dummy ) : PhaseValues( gvn, dummy ) {} | |
372 | |
373 // Return a node which computes the same function as this node, but | |
374 // in a faster or cheaper fashion. | |
375 Node *transform( Node *n ); | |
376 Node *transform_no_reclaim( Node *n ); | |
377 | |
378 // Check for a simple dead loop when a data node references itself. | |
379 DEBUG_ONLY(void dead_loop_check(Node *n);) | |
380 }; | |
381 | |
382 //------------------------------PhaseIterGVN----------------------------------- | |
383 // Phase for iteratively performing local, pessimistic GVN-style optimizations. | |
384 // and ideal transformations on the graph. | |
385 class PhaseIterGVN : public PhaseGVN { | |
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386 private: |
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387 bool _delay_transform; // When true simply register the node when calling transform |
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388 // instead of actually optimizing it |
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389 |
0 | 390 // Idealize old Node 'n' with respect to its inputs and its value |
391 virtual Node *transform_old( Node *a_node ); | |
392 protected: | |
393 | |
394 // Idealize new Node 'n' with respect to its inputs and its value | |
395 virtual Node *transform( Node *a_node ); | |
396 | |
397 // Warm up hash table, type table and initial worklist | |
398 void init_worklist( Node *a_root ); | |
399 | |
400 virtual const Type* saturate(const Type* new_type, const Type* old_type, | |
401 const Type* limit_type) const; | |
402 // Usually returns new_type. Returns old_type if new_type is only a slight | |
403 // improvement, such that it would take many (>>10) steps to reach 2**32. | |
404 | |
405 public: | |
406 PhaseIterGVN( PhaseIterGVN *igvn ); // Used by CCP constructor | |
407 PhaseIterGVN( PhaseGVN *gvn ); // Used after Parser | |
408 PhaseIterGVN( PhaseIterGVN *igvn, const char *dummy ); // Used after +VerifyOpto | |
409 | |
410 virtual PhaseIterGVN *is_IterGVN() { return this; } | |
411 | |
412 Unique_Node_List _worklist; // Iterative worklist | |
413 | |
414 // Given def-use info and an initial worklist, apply Node::Ideal, | |
415 // Node::Value, Node::Identity, hash-based value numbering, Node::Ideal_DU | |
416 // and dominator info to a fixed point. | |
417 void optimize(); | |
418 | |
419 // Register a new node with the iter GVN pass without transforming it. | |
420 // Used when we need to restructure a Region/Phi area and all the Regions | |
421 // and Phis need to complete this one big transform before any other | |
422 // transforms can be triggered on the region. | |
423 // Optional 'orig' is an earlier version of this node. | |
424 // It is significant only for debugging and profiling. | |
425 Node* register_new_node_with_optimizer(Node* n, Node* orig = NULL); | |
426 | |
427 // Kill a globally dead Node. It is allowed to have uses which are | |
428 // assumed dead and left 'in limbo'. | |
429 void remove_globally_dead_node( Node *dead ); | |
430 | |
431 // Kill all inputs to a dead node, recursively making more dead nodes. | |
432 // The Node must be dead locally, i.e., have no uses. | |
433 void remove_dead_node( Node *dead ) { | |
434 assert(dead->outcnt() == 0 && !dead->is_top(), "node must be dead"); | |
435 remove_globally_dead_node(dead); | |
436 } | |
437 | |
438 // Subsume users of node 'old' into node 'nn' | |
439 // If no Def-Use info existed for 'nn' it will after call. | |
440 void subsume_node( Node *old, Node *nn ); | |
441 | |
442 // Add users of 'n' to worklist | |
443 void add_users_to_worklist0( Node *n ); | |
444 void add_users_to_worklist ( Node *n ); | |
445 | |
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446 // Replace old node with new one. |
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447 void replace_node( Node *old, Node *nn ) { |
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448 add_users_to_worklist(old); |
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449 hash_delete(old); |
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450 subsume_node(old, nn); |
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451 } |
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452 |
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453 void set_delay_transform(bool delay) { |
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454 _delay_transform = delay; |
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455 } |
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456 |
0 | 457 #ifndef PRODUCT |
458 protected: | |
459 // Sub-quadratic implementation of VerifyIterativeGVN. | |
460 unsigned long _verify_counter; | |
461 unsigned long _verify_full_passes; | |
462 enum { _verify_window_size = 30 }; | |
463 Node* _verify_window[_verify_window_size]; | |
464 void verify_step(Node* n); | |
465 #endif | |
466 }; | |
467 | |
468 //------------------------------PhaseCCP--------------------------------------- | |
469 // Phase for performing global Conditional Constant Propagation. | |
470 // Should be replaced with combined CCP & GVN someday. | |
471 class PhaseCCP : public PhaseIterGVN { | |
472 // Non-recursive. Use analysis to transform single Node. | |
473 virtual Node *transform_once( Node *n ); | |
474 | |
475 public: | |
476 PhaseCCP( PhaseIterGVN *igvn ); // Compute conditional constants | |
477 NOT_PRODUCT( ~PhaseCCP(); ) | |
478 | |
479 // Worklist algorithm identifies constants | |
480 void analyze(); | |
481 // Recursive traversal of program. Used analysis to modify program. | |
482 virtual Node *transform( Node *n ); | |
483 // Do any transformation after analysis | |
484 void do_transform(); | |
485 | |
486 virtual const Type* saturate(const Type* new_type, const Type* old_type, | |
487 const Type* limit_type) const; | |
488 // Returns new_type->widen(old_type), which increments the widen bits until | |
489 // giving up with TypeInt::INT or TypeLong::LONG. | |
490 // Result is clipped to limit_type if necessary. | |
491 | |
492 #ifndef PRODUCT | |
493 static uint _total_invokes; // For profiling, count invocations | |
494 void inc_invokes() { ++PhaseCCP::_total_invokes; } | |
495 | |
496 static uint _total_constants; // For profiling, count constants found | |
497 uint _count_constants; | |
498 void clear_constants() { _count_constants = 0; } | |
499 void inc_constants() { ++_count_constants; } | |
500 uint count_constants() const { return _count_constants; } | |
501 | |
502 static void print_statistics(); | |
503 #endif | |
504 }; | |
505 | |
506 | |
507 //------------------------------PhasePeephole---------------------------------- | |
508 // Phase for performing peephole optimizations on register allocated basic blocks. | |
509 class PhasePeephole : public PhaseTransform { | |
510 PhaseRegAlloc *_regalloc; | |
511 PhaseCFG &_cfg; | |
512 // Recursive traversal of program. Pure function is unused in this phase | |
513 virtual Node *transform( Node *n ); | |
514 | |
515 public: | |
516 PhasePeephole( PhaseRegAlloc *regalloc, PhaseCFG &cfg ); | |
517 NOT_PRODUCT( ~PhasePeephole(); ) | |
518 | |
519 // Do any transformation after analysis | |
520 void do_transform(); | |
521 | |
522 #ifndef PRODUCT | |
523 static uint _total_peepholes; // For profiling, count peephole rules applied | |
524 uint _count_peepholes; | |
525 void clear_peepholes() { _count_peepholes = 0; } | |
526 void inc_peepholes() { ++_count_peepholes; } | |
527 uint count_peepholes() const { return _count_peepholes; } | |
528 | |
529 static void print_statistics(); | |
530 #endif | |
531 }; |