1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OPTO_LIVE_HPP
26 #define SHARE_VM_OPTO_LIVE_HPP
27
28 #include "libadt/port.hpp"
29 #include "libadt/vectset.hpp"
30 #include "opto/block.hpp"
31 #include "opto/indexSet.hpp"
32 #include "opto/phase.hpp"
33 #include "opto/regmask.hpp"
34
35 class Block;
36 class PhaseCFG;
37 class VectorSet;
38 class IndexSet;
39
40 //------------------------------LRG_List---------------------------------------
41 // Map Node indices to Live RanGe indices.
42 // Array lookup in the optimized case.
43 typedef GrowableArray<uint> LRG_List;
44
45 //------------------------------PhaseLive--------------------------------------
46 // Compute live-in/live-out
47 class PhaseLive : public Phase {
48 // Array of Sets of values live at the start of a block.
49 // Indexed by block pre-order number.
50 IndexSet *_live;
51
52 // Array of Sets of values defined locally in the block
53 // Indexed by block pre-order number.
54 IndexSet *_defs;
55
56 // Array of delta-set pointers, indexed by block pre-order number
57 IndexSet **_deltas;
58 IndexSet *_free_IndexSet; // Free list of same
59
60 Block_List *_worklist; // Worklist for iterative solution
61
62 const PhaseCFG &_cfg; // Basic blocks
63 const LRG_List &_names; // Mapping from Nodes to live ranges
64 uint _maxlrg; // Largest live-range number
65 Arena *_arena;
66
67 IndexSet *getset( Block *p );
68 IndexSet *getfreeset( );
69 void freeset( const Block *p );
70 void add_liveout( Block *p, uint r, VectorSet &first_pass );
71 void add_liveout( Block *p, IndexSet *lo, VectorSet &first_pass );
72
73 public:
74 PhaseLive(const PhaseCFG &cfg, const LRG_List &names, Arena *arena);
75 ~PhaseLive() {}
76 // Compute liveness info
77 void compute(uint maxlrg);
78 // Reset arena storage
79 void reset() { _live = NULL; }
80
81 // Return the live-out set for this block
82 IndexSet *live( const Block * b ) { return &_live[b->_pre_order-1]; }
83
84 #ifndef PRODUCT
85 void dump( const Block *b ) const;
86 void stats(uint iters) const;
87 #endif
88 };
89
90 #endif // SHARE_VM_OPTO_LIVE_HPP