1 /* 2 * Copyright (c) 1997, 2010, 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 LRG_List; 37 class PhaseCFG; 38 class VectorSet; 39 class IndexSet; 40 41 //------------------------------PhaseLive-------------------------------------- 42 // Compute live-in/live-out 43 class PhaseLive : public Phase { 44 // Array of Sets of values live at the start of a block. 45 // Indexed by block pre-order number. 46 IndexSet *_live; 47 48 // Array of Sets of values defined locally in the block 49 // Indexed by block pre-order number. 50 IndexSet *_defs; 51 52 // Array of delta-set pointers, indexed by block pre-order number 53 IndexSet **_deltas; 54 IndexSet *_free_IndexSet; // Free list of same 55 56 Block_List *_worklist; // Worklist for iterative solution 57 58 const PhaseCFG &_cfg; // Basic blocks 59 LRG_List &_names; // Mapping from Nodes to live ranges 60 uint _maxlrg; // Largest live-range number 61 Arena *_arena; 62 63 IndexSet *getset( Block *p ); 64 IndexSet *getfreeset( ); 65 void freeset( const Block *p ); 66 void add_liveout( Block *p, uint r, VectorSet &first_pass ); 67 void add_liveout( Block *p, IndexSet *lo, VectorSet &first_pass ); 68 69 public: 70 PhaseLive( const PhaseCFG &cfg, LRG_List &names, Arena *arena ); 71 ~PhaseLive() {} 72 // Compute liveness info 73 void compute(uint maxlrg); 74 // Reset arena storage 75 void reset() { _live = NULL; } 76 77 // Return the live-out set for this block 78 IndexSet *live( const Block * b ) { return &_live[b->_pre_order-1]; } 79 80 #ifndef PRODUCT 81 void dump( const Block *b ) const; 82 void stats(uint iters) const; 83 #endif 84 }; 85 86 #endif // SHARE_VM_OPTO_LIVE_HPP