live.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1997, 2005, 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 25class Block; 26class LRG_List; 27class PhaseCFG; 28class VectorSet; 29class IndexSet; 30 31//------------------------------PhaseLive-------------------------------------- 32// Compute live-in/live-out 33class PhaseLive : public Phase { 34 // Array of Sets of values live at the start of a block. 35 // Indexed by block pre-order number. 36 IndexSet *_live; 37 38 // Array of Sets of values defined locally in the block 39 // Indexed by block pre-order number. 40 IndexSet *_defs; 41 42 // Array of delta-set pointers, indexed by block pre-order number 43 IndexSet **_deltas; 44 IndexSet *_free_IndexSet; // Free list of same 45 46 Block_List *_worklist; // Worklist for iterative solution 47 48 const PhaseCFG &_cfg; // Basic blocks 49 LRG_List &_names; // Mapping from Nodes to live ranges 50 uint _maxlrg; // Largest live-range number 51 Arena *_arena; 52 53 IndexSet *getset( Block *p ); 54 IndexSet *getfreeset( ); 55 void freeset( const Block *p ); 56 void add_liveout( Block *p, uint r, VectorSet &first_pass ); 57 void add_liveout( Block *p, IndexSet *lo, VectorSet &first_pass ); 58 59public: 60 PhaseLive( const PhaseCFG &cfg, LRG_List &names, Arena *arena ); 61 ~PhaseLive() {} 62 // Compute liveness info 63 void compute(uint maxlrg); 64 // Reset arena storage 65 void reset() { _live = NULL; } 66 67 // Return the live-out set for this block 68 IndexSet *live( const Block * b ) { return &_live[b->_pre_order-1]; } 69 70#ifndef PRODUCT 71 void dump( const Block *b ) const; 72 void stats(uint iters) const; 73#endif 74}; 75