75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
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/*
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* Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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class Block;
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class LRG_List;
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class PhaseCFG;
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class VectorSet;
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class IndexSet;
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//------------------------------PhaseLive--------------------------------------
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// Compute live-in/live-out
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class PhaseLive : public Phase {
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// Array of Sets of values live at the start of a block.
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// Indexed by block pre-order number.
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IndexSet *_live;
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// Array of Sets of values defined locally in the block
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// Indexed by block pre-order number.
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IndexSet *_defs;
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// Array of delta-set pointers, indexed by block pre-order number
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IndexSet **_deltas;
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IndexSet *_free_IndexSet; // Free list of same
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Block_List *_worklist; // Worklist for iterative solution
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const PhaseCFG &_cfg; // Basic blocks
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LRG_List &_names; // Mapping from Nodes to live ranges
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uint _maxlrg; // Largest live-range number
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Arena *_arena;
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IndexSet *getset( Block *p );
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IndexSet *getfreeset( );
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void freeset( const Block *p );
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void add_liveout( Block *p, uint r, VectorSet &first_pass );
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void add_liveout( Block *p, IndexSet *lo, VectorSet &first_pass );
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public:
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PhaseLive( const PhaseCFG &cfg, LRG_List &names, Arena *arena );
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~PhaseLive() {}
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// Compute liveness info
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void compute(uint maxlrg);
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// Reset arena storage
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void reset() { _live = NULL; }
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// Return the live-out set for this block
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IndexSet *live( const Block * b ) { return &_live[b->_pre_order-1]; }
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#ifndef PRODUCT
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void dump( const Block *b ) const;
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void stats(uint iters) const;
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#endif
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};
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