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1 /*
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2 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class Block;
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26 class LRG_List;
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27 class PhaseCFG;
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28 class VectorSet;
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29 class IndexSet;
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30
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31 //------------------------------PhaseLive--------------------------------------
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32 // Compute live-in/live-out
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33 class PhaseLive : public Phase {
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34 // Array of Sets of values live at the start of a block.
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35 // Indexed by block pre-order number.
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36 IndexSet *_live;
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37
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38 // Array of Sets of values defined locally in the block
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39 // Indexed by block pre-order number.
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40 IndexSet *_defs;
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41
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42 // Array of delta-set pointers, indexed by block pre-order number
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43 IndexSet **_deltas;
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44 IndexSet *_free_IndexSet; // Free list of same
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45
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46 Block_List *_worklist; // Worklist for iterative solution
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47
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48 const PhaseCFG &_cfg; // Basic blocks
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49 LRG_List &_names; // Mapping from Nodes to live ranges
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50 uint _maxlrg; // Largest live-range number
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51 Arena *_arena;
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52
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53 IndexSet *getset( Block *p );
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54 IndexSet *getfreeset( );
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55 void freeset( const Block *p );
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56 void add_liveout( Block *p, uint r, VectorSet &first_pass );
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57 void add_liveout( Block *p, IndexSet *lo, VectorSet &first_pass );
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58
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59 public:
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60 PhaseLive( const PhaseCFG &cfg, LRG_List &names, Arena *arena );
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61 ~PhaseLive() {}
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62 // Compute liveness info
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63 void compute(uint maxlrg);
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64 // Reset arena storage
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65 void reset() { _live = NULL; }
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66
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67 // Return the live-out set for this block
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68 IndexSet *live( const Block * b ) { return &_live[b->_pre_order-1]; }
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69
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70 #ifndef PRODUCT
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71 void dump( const Block *b ) const;
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72 void stats(uint iters) const;
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73 #endif
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74 };
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