[13] | 1 | /**CFile*********************************************************************** |
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| 2 | |
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| 3 | FileName [cuddTable.c] |
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| 4 | |
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| 5 | PackageName [cudd] |
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| 6 | |
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| 7 | Synopsis [Unique table management functions.] |
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| 8 | |
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| 9 | Description [External procedures included in this module: |
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| 10 | <ul> |
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| 11 | <li> Cudd_Prime() |
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| 12 | </ul> |
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| 13 | Internal procedures included in this module: |
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| 14 | <ul> |
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| 15 | <li> cuddAllocNode() |
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| 16 | <li> cuddInitTable() |
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| 17 | <li> cuddFreeTable() |
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| 18 | <li> cuddGarbageCollect() |
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| 19 | <li> cuddZddGetNode() |
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| 20 | <li> cuddZddGetNodeIVO() |
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| 21 | <li> cuddUniqueInter() |
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| 22 | <li> cuddUniqueInterIVO() |
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| 23 | <li> cuddUniqueInterZdd() |
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| 24 | <li> cuddUniqueConst() |
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| 25 | <li> cuddRehash() |
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| 26 | <li> cuddShrinkSubtable() |
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| 27 | <li> cuddInsertSubtables() |
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| 28 | <li> cuddDestroySubtables() |
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| 29 | <li> cuddResizeTableZdd() |
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| 30 | <li> cuddSlowTableGrowth() |
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| 31 | </ul> |
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| 32 | Static procedures included in this module: |
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| 33 | <ul> |
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| 34 | <li> ddRehashZdd() |
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| 35 | <li> ddResizeTable() |
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| 36 | <li> cuddFindParent() |
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| 37 | <li> cuddOrderedInsert() |
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| 38 | <li> cuddOrderedThread() |
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| 39 | <li> cuddRotateLeft() |
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| 40 | <li> cuddRotateRight() |
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| 41 | <li> cuddDoRebalance() |
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| 42 | <li> cuddCheckCollisionOrdering() |
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| 43 | </ul>] |
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| 44 | |
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| 45 | SeeAlso [] |
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| 46 | |
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| 47 | Author [Fabio Somenzi] |
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| 48 | |
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| 49 | Copyright [Copyright (c) 1995-2004, Regents of the University of Colorado |
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| 50 | |
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| 51 | All rights reserved. |
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| 52 | |
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| 53 | Redistribution and use in source and binary forms, with or without |
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| 54 | modification, are permitted provided that the following conditions |
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| 55 | are met: |
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| 56 | |
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| 57 | Redistributions of source code must retain the above copyright |
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| 58 | notice, this list of conditions and the following disclaimer. |
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| 59 | |
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| 60 | Redistributions in binary form must reproduce the above copyright |
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| 61 | notice, this list of conditions and the following disclaimer in the |
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| 62 | documentation and/or other materials provided with the distribution. |
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| 63 | |
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| 64 | Neither the name of the University of Colorado nor the names of its |
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| 65 | contributors may be used to endorse or promote products derived from |
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| 66 | this software without specific prior written permission. |
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| 67 | |
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| 68 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 69 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 70 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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| 71 | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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| 72 | COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 73 | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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| 74 | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 75 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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| 76 | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 77 | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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| 78 | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 79 | POSSIBILITY OF SUCH DAMAGE.] |
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| 80 | |
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| 81 | ******************************************************************************/ |
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| 82 | |
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| 83 | #include "util.h" |
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| 84 | #include "cuddInt.h" |
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| 85 | |
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| 86 | /*---------------------------------------------------------------------------*/ |
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| 87 | /* Constant declarations */ |
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| 88 | /*---------------------------------------------------------------------------*/ |
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| 89 | |
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| 90 | #ifndef DD_UNSORTED_FREE_LIST |
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| 91 | #ifdef DD_RED_BLACK_FREE_LIST |
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| 92 | /* Constants for red/black trees. */ |
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| 93 | #define DD_STACK_SIZE 128 |
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| 94 | #define DD_RED 0 |
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| 95 | #define DD_BLACK 1 |
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| 96 | #define DD_PAGE_SIZE 8192 |
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| 97 | #define DD_PAGE_MASK ~(DD_PAGE_SIZE - 1) |
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| 98 | #endif |
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| 99 | #endif |
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| 100 | |
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| 101 | /*---------------------------------------------------------------------------*/ |
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| 102 | /* Stucture declarations */ |
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| 103 | /*---------------------------------------------------------------------------*/ |
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| 104 | |
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| 105 | /* This is a hack for when CUDD_VALUE_TYPE is double */ |
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| 106 | typedef union hack { |
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| 107 | CUDD_VALUE_TYPE value; |
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| 108 | unsigned int bits[2]; |
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| 109 | } hack; |
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| 110 | |
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| 111 | /*---------------------------------------------------------------------------*/ |
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| 112 | /* Type declarations */ |
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| 113 | /*---------------------------------------------------------------------------*/ |
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| 114 | |
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| 115 | /*---------------------------------------------------------------------------*/ |
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| 116 | /* Variable declarations */ |
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| 117 | /*---------------------------------------------------------------------------*/ |
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| 118 | |
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| 119 | #ifndef lint |
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| 120 | static char rcsid[] DD_UNUSED = "$Id: cuddTable.c,v 1.122 2009/02/19 16:24:28 fabio Exp $"; |
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| 121 | #endif |
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| 122 | |
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| 123 | /*---------------------------------------------------------------------------*/ |
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| 124 | /* Macro declarations */ |
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| 125 | /*---------------------------------------------------------------------------*/ |
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| 126 | |
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| 127 | |
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| 128 | #ifndef DD_UNSORTED_FREE_LIST |
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| 129 | #ifdef DD_RED_BLACK_FREE_LIST |
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| 130 | /* Macros for red/black trees. */ |
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| 131 | #define DD_INSERT_COMPARE(x,y) \ |
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| 132 | (((ptruint) (x) & DD_PAGE_MASK) - ((ptruint) (y) & DD_PAGE_MASK)) |
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| 133 | #define DD_COLOR(p) ((p)->index) |
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| 134 | #define DD_IS_BLACK(p) ((p)->index == DD_BLACK) |
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| 135 | #define DD_IS_RED(p) ((p)->index == DD_RED) |
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| 136 | #define DD_LEFT(p) cuddT(p) |
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| 137 | #define DD_RIGHT(p) cuddE(p) |
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| 138 | #define DD_NEXT(p) ((p)->next) |
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| 139 | #endif |
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| 140 | #endif |
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| 141 | |
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| 142 | |
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| 143 | /**AutomaticStart*************************************************************/ |
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| 144 | |
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| 145 | /*---------------------------------------------------------------------------*/ |
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| 146 | /* Static function prototypes */ |
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| 147 | /*---------------------------------------------------------------------------*/ |
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| 148 | |
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| 149 | static void ddRehashZdd (DdManager *unique, int i); |
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| 150 | static int ddResizeTable (DdManager *unique, int index); |
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| 151 | static int cuddFindParent (DdManager *table, DdNode *node); |
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| 152 | DD_INLINE static void ddFixLimits (DdManager *unique); |
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| 153 | #ifdef DD_RED_BLACK_FREE_LIST |
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| 154 | static void cuddOrderedInsert (DdNodePtr *root, DdNodePtr node); |
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| 155 | static DdNode * cuddOrderedThread (DdNode *root, DdNode *list); |
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| 156 | static void cuddRotateLeft (DdNodePtr *nodeP); |
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| 157 | static void cuddRotateRight (DdNodePtr *nodeP); |
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| 158 | static void cuddDoRebalance (DdNodePtr **stack, int stackN); |
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| 159 | #endif |
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| 160 | static void ddPatchTree (DdManager *dd, MtrNode *treenode); |
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| 161 | #ifdef DD_DEBUG |
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| 162 | static int cuddCheckCollisionOrdering (DdManager *unique, int i, int j); |
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| 163 | #endif |
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| 164 | static void ddReportRefMess (DdManager *unique, int i, const char *caller); |
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| 165 | |
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| 166 | /**AutomaticEnd***************************************************************/ |
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| 167 | |
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| 168 | |
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| 169 | /*---------------------------------------------------------------------------*/ |
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| 170 | /* Definition of exported functions */ |
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| 171 | /*---------------------------------------------------------------------------*/ |
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| 172 | |
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| 173 | |
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| 174 | /**Function******************************************************************** |
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| 175 | |
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| 176 | Synopsis [Returns the next prime >= p.] |
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| 177 | |
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| 178 | Description [] |
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| 179 | |
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| 180 | SideEffects [None] |
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| 181 | |
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| 182 | ******************************************************************************/ |
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| 183 | unsigned int |
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| 184 | Cudd_Prime( |
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| 185 | unsigned int p) |
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| 186 | { |
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| 187 | int i,pn; |
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| 188 | |
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| 189 | p--; |
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| 190 | do { |
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| 191 | p++; |
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| 192 | if (p&1) { |
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| 193 | pn = 1; |
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| 194 | i = 3; |
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| 195 | while ((unsigned) (i * i) <= p) { |
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| 196 | if (p % i == 0) { |
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| 197 | pn = 0; |
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| 198 | break; |
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| 199 | } |
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| 200 | i += 2; |
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| 201 | } |
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| 202 | } else { |
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| 203 | pn = 0; |
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| 204 | } |
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| 205 | } while (!pn); |
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| 206 | return(p); |
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| 207 | |
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| 208 | } /* end of Cudd_Prime */ |
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| 209 | |
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| 210 | |
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| 211 | /*---------------------------------------------------------------------------*/ |
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| 212 | /* Definition of internal functions */ |
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| 213 | /*---------------------------------------------------------------------------*/ |
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| 214 | |
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| 215 | |
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| 216 | /**Function******************************************************************** |
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| 217 | |
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| 218 | Synopsis [Fast storage allocation for DdNodes in the table.] |
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| 219 | |
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| 220 | Description [Fast storage allocation for DdNodes in the table. The |
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| 221 | first 4 bytes of a chunk contain a pointer to the next block; the |
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| 222 | rest contains DD_MEM_CHUNK spaces for DdNodes. Returns a pointer to |
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| 223 | a new node if successful; NULL is memory is full.] |
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| 224 | |
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| 225 | SideEffects [None] |
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| 226 | |
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| 227 | SeeAlso [cuddDynamicAllocNode] |
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| 228 | |
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| 229 | ******************************************************************************/ |
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| 230 | DdNode * |
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| 231 | cuddAllocNode( |
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| 232 | DdManager * unique) |
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| 233 | { |
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| 234 | int i; |
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| 235 | DdNodePtr *mem; |
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| 236 | DdNode *list, *node; |
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| 237 | extern DD_OOMFP MMoutOfMemory; |
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| 238 | DD_OOMFP saveHandler; |
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| 239 | |
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| 240 | if (unique->nextFree == NULL) { /* free list is empty */ |
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| 241 | /* Check for exceeded limits. */ |
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| 242 | if ((unique->keys - unique->dead) + (unique->keysZ - unique->deadZ) > |
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| 243 | unique->maxLive) { |
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| 244 | unique->errorCode = CUDD_TOO_MANY_NODES; |
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| 245 | return(NULL); |
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| 246 | } |
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| 247 | if (unique->stash == NULL || unique->memused > unique->maxmemhard) { |
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| 248 | (void) cuddGarbageCollect(unique,1); |
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| 249 | mem = NULL; |
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| 250 | } |
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| 251 | if (unique->nextFree == NULL) { |
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| 252 | if (unique->memused > unique->maxmemhard) { |
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| 253 | unique->errorCode = CUDD_MAX_MEM_EXCEEDED; |
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| 254 | return(NULL); |
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| 255 | } |
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| 256 | /* Try to allocate a new block. */ |
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| 257 | saveHandler = MMoutOfMemory; |
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| 258 | MMoutOfMemory = Cudd_OutOfMem; |
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| 259 | mem = (DdNodePtr *) ALLOC(DdNode,DD_MEM_CHUNK + 1); |
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| 260 | MMoutOfMemory = saveHandler; |
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| 261 | if (mem == NULL) { |
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| 262 | /* No more memory: Try collecting garbage. If this succeeds, |
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| 263 | ** we end up with mem still NULL, but unique->nextFree != |
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| 264 | ** NULL. */ |
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| 265 | if (cuddGarbageCollect(unique,1) == 0) { |
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| 266 | /* Last resort: Free the memory stashed away, if there |
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| 267 | ** any. If this succeeeds, mem != NULL and |
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| 268 | ** unique->nextFree still NULL. */ |
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| 269 | if (unique->stash != NULL) { |
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| 270 | FREE(unique->stash); |
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| 271 | unique->stash = NULL; |
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| 272 | /* Inhibit resizing of tables. */ |
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| 273 | cuddSlowTableGrowth(unique); |
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| 274 | /* Now try again. */ |
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| 275 | mem = (DdNodePtr *) ALLOC(DdNode,DD_MEM_CHUNK + 1); |
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| 276 | } |
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| 277 | if (mem == NULL) { |
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| 278 | /* Out of luck. Call the default handler to do |
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| 279 | ** whatever it specifies for a failed malloc. |
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| 280 | ** If this handler returns, then set error code, |
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| 281 | ** print warning, and return. */ |
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| 282 | (*MMoutOfMemory)(sizeof(DdNode)*(DD_MEM_CHUNK + 1)); |
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| 283 | unique->errorCode = CUDD_MEMORY_OUT; |
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| 284 | #ifdef DD_VERBOSE |
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| 285 | (void) fprintf(unique->err, |
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| 286 | "cuddAllocNode: out of memory"); |
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| 287 | (void) fprintf(unique->err, "Memory in use = %lu\n", |
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| 288 | unique->memused); |
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| 289 | #endif |
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| 290 | return(NULL); |
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| 291 | } |
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| 292 | } |
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| 293 | } |
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| 294 | if (mem != NULL) { /* successful allocation; slice memory */ |
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| 295 | ptruint offset; |
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| 296 | unique->memused += (DD_MEM_CHUNK + 1) * sizeof(DdNode); |
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| 297 | mem[0] = (DdNodePtr) unique->memoryList; |
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| 298 | unique->memoryList = mem; |
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| 299 | |
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| 300 | /* Here we rely on the fact that a DdNode is as large |
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| 301 | ** as 4 pointers. */ |
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| 302 | offset = (ptruint) mem & (sizeof(DdNode) - 1); |
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| 303 | mem += (sizeof(DdNode) - offset) / sizeof(DdNodePtr); |
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| 304 | assert(((ptruint) mem & (sizeof(DdNode) - 1)) == 0); |
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| 305 | list = (DdNode *) mem; |
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| 306 | |
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| 307 | i = 1; |
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| 308 | do { |
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| 309 | list[i - 1].ref = 0; |
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| 310 | list[i - 1].next = &list[i]; |
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| 311 | } while (++i < DD_MEM_CHUNK); |
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| 312 | |
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| 313 | list[DD_MEM_CHUNK-1].ref = 0; |
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| 314 | list[DD_MEM_CHUNK-1].next = NULL; |
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| 315 | |
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| 316 | unique->nextFree = &list[0]; |
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| 317 | } |
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| 318 | } |
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| 319 | } |
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| 320 | unique->allocated++; |
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| 321 | node = unique->nextFree; |
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| 322 | unique->nextFree = node->next; |
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| 323 | return(node); |
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| 324 | |
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| 325 | } /* end of cuddAllocNode */ |
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| 326 | |
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| 327 | |
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| 328 | /**Function******************************************************************** |
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| 329 | |
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| 330 | Synopsis [Creates and initializes the unique table.] |
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| 331 | |
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| 332 | Description [Creates and initializes the unique table. Returns a pointer |
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| 333 | to the table if successful; NULL otherwise.] |
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| 334 | |
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| 335 | SideEffects [None] |
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| 336 | |
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| 337 | SeeAlso [Cudd_Init cuddFreeTable] |
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| 338 | |
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| 339 | ******************************************************************************/ |
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| 340 | DdManager * |
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| 341 | cuddInitTable( |
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| 342 | unsigned int numVars /* Initial number of BDD variables (and subtables) */, |
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| 343 | unsigned int numVarsZ /* Initial number of ZDD variables (and subtables) */, |
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| 344 | unsigned int numSlots /* Initial size of the BDD subtables */, |
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| 345 | unsigned int looseUpTo /* Limit for fast table growth */) |
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| 346 | { |
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| 347 | DdManager *unique = ALLOC(DdManager,1); |
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| 348 | int i, j; |
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| 349 | DdNodePtr *nodelist; |
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| 350 | DdNode *sentinel; |
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| 351 | unsigned int slots; |
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| 352 | int shift; |
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| 353 | |
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| 354 | if (unique == NULL) { |
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| 355 | return(NULL); |
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| 356 | } |
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| 357 | sentinel = &(unique->sentinel); |
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| 358 | sentinel->ref = 0; |
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| 359 | sentinel->index = 0; |
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| 360 | cuddT(sentinel) = NULL; |
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| 361 | cuddE(sentinel) = NULL; |
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| 362 | sentinel->next = NULL; |
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| 363 | unique->epsilon = DD_EPSILON; |
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| 364 | unique->maxGrowth = DD_MAX_REORDER_GROWTH; |
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| 365 | unique->maxGrowthAlt = 2.0 * DD_MAX_REORDER_GROWTH; |
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| 366 | unique->reordCycle = 0; /* do not use alternate threshold */ |
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| 367 | unique->size = numVars; |
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| 368 | unique->sizeZ = numVarsZ; |
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| 369 | unique->maxSize = ddMax(DD_DEFAULT_RESIZE, numVars); |
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| 370 | unique->maxSizeZ = ddMax(DD_DEFAULT_RESIZE, numVarsZ); |
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| 371 | |
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| 372 | /* Adjust the requested number of slots to a power of 2. */ |
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| 373 | slots = 8; |
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| 374 | while (slots < numSlots) { |
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| 375 | slots <<= 1; |
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| 376 | } |
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| 377 | unique->initSlots = slots; |
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| 378 | shift = sizeof(int) * 8 - cuddComputeFloorLog2(slots); |
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| 379 | |
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| 380 | unique->slots = (numVars + numVarsZ + 1) * slots; |
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| 381 | unique->keys = 0; |
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| 382 | unique->maxLive = ~0; /* very large number */ |
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| 383 | unique->keysZ = 0; |
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| 384 | unique->dead = 0; |
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| 385 | unique->deadZ = 0; |
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| 386 | unique->gcFrac = DD_GC_FRAC_HI; |
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| 387 | unique->minDead = (unsigned) (DD_GC_FRAC_HI * (double) unique->slots); |
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| 388 | unique->looseUpTo = looseUpTo; |
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| 389 | unique->gcEnabled = 1; |
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| 390 | unique->allocated = 0; |
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| 391 | unique->reclaimed = 0; |
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| 392 | unique->subtables = ALLOC(DdSubtable,unique->maxSize); |
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| 393 | if (unique->subtables == NULL) { |
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| 394 | FREE(unique); |
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| 395 | return(NULL); |
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| 396 | } |
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| 397 | unique->subtableZ = ALLOC(DdSubtable,unique->maxSizeZ); |
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| 398 | if (unique->subtableZ == NULL) { |
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| 399 | FREE(unique->subtables); |
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| 400 | FREE(unique); |
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| 401 | return(NULL); |
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| 402 | } |
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| 403 | unique->perm = ALLOC(int,unique->maxSize); |
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| 404 | if (unique->perm == NULL) { |
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| 405 | FREE(unique->subtables); |
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| 406 | FREE(unique->subtableZ); |
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| 407 | FREE(unique); |
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| 408 | return(NULL); |
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| 409 | } |
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| 410 | unique->invperm = ALLOC(int,unique->maxSize); |
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| 411 | if (unique->invperm == NULL) { |
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| 412 | FREE(unique->subtables); |
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| 413 | FREE(unique->subtableZ); |
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| 414 | FREE(unique->perm); |
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| 415 | FREE(unique); |
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| 416 | return(NULL); |
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| 417 | } |
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| 418 | unique->permZ = ALLOC(int,unique->maxSizeZ); |
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| 419 | if (unique->permZ == NULL) { |
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| 420 | FREE(unique->subtables); |
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| 421 | FREE(unique->subtableZ); |
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| 422 | FREE(unique->perm); |
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| 423 | FREE(unique->invperm); |
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| 424 | FREE(unique); |
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| 425 | return(NULL); |
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| 426 | } |
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| 427 | unique->invpermZ = ALLOC(int,unique->maxSizeZ); |
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| 428 | if (unique->invpermZ == NULL) { |
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| 429 | FREE(unique->subtables); |
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| 430 | FREE(unique->subtableZ); |
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| 431 | FREE(unique->perm); |
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| 432 | FREE(unique->invperm); |
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| 433 | FREE(unique->permZ); |
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| 434 | FREE(unique); |
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| 435 | return(NULL); |
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| 436 | } |
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| 437 | unique->map = NULL; |
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| 438 | unique->stack = ALLOC(DdNodePtr,ddMax(unique->maxSize,unique->maxSizeZ)+1); |
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| 439 | if (unique->stack == NULL) { |
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| 440 | FREE(unique->subtables); |
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| 441 | FREE(unique->subtableZ); |
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| 442 | FREE(unique->perm); |
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| 443 | FREE(unique->invperm); |
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| 444 | FREE(unique->permZ); |
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| 445 | FREE(unique->invpermZ); |
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| 446 | FREE(unique); |
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| 447 | return(NULL); |
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| 448 | } |
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| 449 | unique->stack[0] = NULL; /* to suppress harmless UMR */ |
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| 450 | |
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| 451 | #ifndef DD_NO_DEATH_ROW |
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| 452 | unique->deathRowDepth = 1 << cuddComputeFloorLog2(unique->looseUpTo >> 2); |
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| 453 | unique->deathRow = ALLOC(DdNodePtr,unique->deathRowDepth); |
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| 454 | if (unique->deathRow == NULL) { |
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| 455 | FREE(unique->subtables); |
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| 456 | FREE(unique->subtableZ); |
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| 457 | FREE(unique->perm); |
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| 458 | FREE(unique->invperm); |
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| 459 | FREE(unique->permZ); |
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| 460 | FREE(unique->invpermZ); |
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| 461 | FREE(unique->stack); |
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| 462 | FREE(unique); |
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| 463 | return(NULL); |
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| 464 | } |
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| 465 | for (i = 0; i < unique->deathRowDepth; i++) { |
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| 466 | unique->deathRow[i] = NULL; |
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| 467 | } |
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| 468 | unique->nextDead = 0; |
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| 469 | unique->deadMask = unique->deathRowDepth - 1; |
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| 470 | #endif |
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| 471 | |
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| 472 | for (i = 0; (unsigned) i < numVars; i++) { |
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| 473 | unique->subtables[i].slots = slots; |
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| 474 | unique->subtables[i].shift = shift; |
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| 475 | unique->subtables[i].keys = 0; |
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| 476 | unique->subtables[i].dead = 0; |
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| 477 | unique->subtables[i].maxKeys = slots * DD_MAX_SUBTABLE_DENSITY; |
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| 478 | unique->subtables[i].bindVar = 0; |
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| 479 | unique->subtables[i].varType = CUDD_VAR_PRIMARY_INPUT; |
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| 480 | unique->subtables[i].pairIndex = 0; |
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| 481 | unique->subtables[i].varHandled = 0; |
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| 482 | unique->subtables[i].varToBeGrouped = CUDD_LAZY_NONE; |
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| 483 | |
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| 484 | nodelist = unique->subtables[i].nodelist = ALLOC(DdNodePtr,slots); |
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| 485 | if (nodelist == NULL) { |
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| 486 | for (j = 0; j < i; j++) { |
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| 487 | FREE(unique->subtables[j].nodelist); |
---|
| 488 | } |
---|
| 489 | FREE(unique->subtables); |
---|
| 490 | FREE(unique->subtableZ); |
---|
| 491 | FREE(unique->perm); |
---|
| 492 | FREE(unique->invperm); |
---|
| 493 | FREE(unique->permZ); |
---|
| 494 | FREE(unique->invpermZ); |
---|
| 495 | FREE(unique->stack); |
---|
| 496 | FREE(unique); |
---|
| 497 | return(NULL); |
---|
| 498 | } |
---|
| 499 | for (j = 0; (unsigned) j < slots; j++) { |
---|
| 500 | nodelist[j] = sentinel; |
---|
| 501 | } |
---|
| 502 | unique->perm[i] = i; |
---|
| 503 | unique->invperm[i] = i; |
---|
| 504 | } |
---|
| 505 | for (i = 0; (unsigned) i < numVarsZ; i++) { |
---|
| 506 | unique->subtableZ[i].slots = slots; |
---|
| 507 | unique->subtableZ[i].shift = shift; |
---|
| 508 | unique->subtableZ[i].keys = 0; |
---|
| 509 | unique->subtableZ[i].dead = 0; |
---|
| 510 | unique->subtableZ[i].maxKeys = slots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 511 | nodelist = unique->subtableZ[i].nodelist = ALLOC(DdNodePtr,slots); |
---|
| 512 | if (nodelist == NULL) { |
---|
| 513 | for (j = 0; (unsigned) j < numVars; j++) { |
---|
| 514 | FREE(unique->subtables[j].nodelist); |
---|
| 515 | } |
---|
| 516 | FREE(unique->subtables); |
---|
| 517 | for (j = 0; j < i; j++) { |
---|
| 518 | FREE(unique->subtableZ[j].nodelist); |
---|
| 519 | } |
---|
| 520 | FREE(unique->subtableZ); |
---|
| 521 | FREE(unique->perm); |
---|
| 522 | FREE(unique->invperm); |
---|
| 523 | FREE(unique->permZ); |
---|
| 524 | FREE(unique->invpermZ); |
---|
| 525 | FREE(unique->stack); |
---|
| 526 | FREE(unique); |
---|
| 527 | return(NULL); |
---|
| 528 | } |
---|
| 529 | for (j = 0; (unsigned) j < slots; j++) { |
---|
| 530 | nodelist[j] = NULL; |
---|
| 531 | } |
---|
| 532 | unique->permZ[i] = i; |
---|
| 533 | unique->invpermZ[i] = i; |
---|
| 534 | } |
---|
| 535 | unique->constants.slots = slots; |
---|
| 536 | unique->constants.shift = shift; |
---|
| 537 | unique->constants.keys = 0; |
---|
| 538 | unique->constants.dead = 0; |
---|
| 539 | unique->constants.maxKeys = slots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 540 | nodelist = unique->constants.nodelist = ALLOC(DdNodePtr,slots); |
---|
| 541 | if (nodelist == NULL) { |
---|
| 542 | for (j = 0; (unsigned) j < numVars; j++) { |
---|
| 543 | FREE(unique->subtables[j].nodelist); |
---|
| 544 | } |
---|
| 545 | FREE(unique->subtables); |
---|
| 546 | for (j = 0; (unsigned) j < numVarsZ; j++) { |
---|
| 547 | FREE(unique->subtableZ[j].nodelist); |
---|
| 548 | } |
---|
| 549 | FREE(unique->subtableZ); |
---|
| 550 | FREE(unique->perm); |
---|
| 551 | FREE(unique->invperm); |
---|
| 552 | FREE(unique->permZ); |
---|
| 553 | FREE(unique->invpermZ); |
---|
| 554 | FREE(unique->stack); |
---|
| 555 | FREE(unique); |
---|
| 556 | return(NULL); |
---|
| 557 | } |
---|
| 558 | for (j = 0; (unsigned) j < slots; j++) { |
---|
| 559 | nodelist[j] = NULL; |
---|
| 560 | } |
---|
| 561 | |
---|
| 562 | unique->memoryList = NULL; |
---|
| 563 | unique->nextFree = NULL; |
---|
| 564 | |
---|
| 565 | unique->memused = sizeof(DdManager) + (unique->maxSize + unique->maxSizeZ) |
---|
| 566 | * (sizeof(DdSubtable) + 2 * sizeof(int)) + (numVars + 1) * |
---|
| 567 | slots * sizeof(DdNodePtr) + |
---|
| 568 | (ddMax(unique->maxSize,unique->maxSizeZ) + 1) * sizeof(DdNodePtr); |
---|
| 569 | #ifndef DD_NO_DEATH_ROW |
---|
| 570 | unique->memused += unique->deathRowDepth * sizeof(DdNodePtr); |
---|
| 571 | #endif |
---|
| 572 | |
---|
| 573 | /* Initialize fields concerned with automatic dynamic reordering */ |
---|
| 574 | unique->reorderings = 0; |
---|
| 575 | unique->autoDyn = 0; /* initially disabled */ |
---|
| 576 | unique->autoDynZ = 0; /* initially disabled */ |
---|
| 577 | unique->realign = 0; /* initially disabled */ |
---|
| 578 | unique->realignZ = 0; /* initially disabled */ |
---|
| 579 | unique->reordered = 0; |
---|
| 580 | unique->autoMethod = CUDD_REORDER_SIFT; |
---|
| 581 | unique->autoMethodZ = CUDD_REORDER_SIFT; |
---|
| 582 | unique->nextDyn = DD_FIRST_REORDER; |
---|
| 583 | unique->countDead = ~0; |
---|
| 584 | unique->siftMaxVar = DD_SIFT_MAX_VAR; |
---|
| 585 | unique->siftMaxSwap = DD_SIFT_MAX_SWAPS; |
---|
| 586 | unique->tree = NULL; |
---|
| 587 | unique->treeZ = NULL; |
---|
| 588 | unique->groupcheck = CUDD_GROUP_CHECK7; |
---|
| 589 | unique->recomb = DD_DEFAULT_RECOMB; |
---|
| 590 | unique->symmviolation = 0; |
---|
| 591 | unique->arcviolation = 0; |
---|
| 592 | unique->populationSize = 0; |
---|
| 593 | unique->numberXovers = 0; |
---|
| 594 | unique->linear = NULL; |
---|
| 595 | unique->linearSize = 0; |
---|
| 596 | |
---|
| 597 | /* Initialize ZDD universe. */ |
---|
| 598 | unique->univ = (DdNodePtr *)NULL; |
---|
| 599 | |
---|
| 600 | /* Initialize auxiliary fields. */ |
---|
| 601 | unique->localCaches = NULL; |
---|
| 602 | unique->preGCHook = NULL; |
---|
| 603 | unique->postGCHook = NULL; |
---|
| 604 | unique->preReorderingHook = NULL; |
---|
| 605 | unique->postReorderingHook = NULL; |
---|
| 606 | unique->out = stdout; |
---|
| 607 | unique->err = stderr; |
---|
| 608 | unique->errorCode = CUDD_NO_ERROR; |
---|
| 609 | |
---|
| 610 | /* Initialize statistical counters. */ |
---|
| 611 | unique->maxmemhard = ~ 0UL; |
---|
| 612 | unique->garbageCollections = 0; |
---|
| 613 | unique->GCTime = 0; |
---|
| 614 | unique->reordTime = 0; |
---|
| 615 | #ifdef DD_STATS |
---|
| 616 | unique->nodesDropped = 0; |
---|
| 617 | unique->nodesFreed = 0; |
---|
| 618 | #endif |
---|
| 619 | unique->peakLiveNodes = 0; |
---|
| 620 | #ifdef DD_UNIQUE_PROFILE |
---|
| 621 | unique->uniqueLookUps = 0; |
---|
| 622 | unique->uniqueLinks = 0; |
---|
| 623 | #endif |
---|
| 624 | #ifdef DD_COUNT |
---|
| 625 | unique->recursiveCalls = 0; |
---|
| 626 | unique->swapSteps = 0; |
---|
| 627 | #ifdef DD_STATS |
---|
| 628 | unique->nextSample = 250000; |
---|
| 629 | #endif |
---|
| 630 | #endif |
---|
| 631 | |
---|
| 632 | return(unique); |
---|
| 633 | |
---|
| 634 | } /* end of cuddInitTable */ |
---|
| 635 | |
---|
| 636 | |
---|
| 637 | /**Function******************************************************************** |
---|
| 638 | |
---|
| 639 | Synopsis [Frees the resources associated to a unique table.] |
---|
| 640 | |
---|
| 641 | Description [] |
---|
| 642 | |
---|
| 643 | SideEffects [None] |
---|
| 644 | |
---|
| 645 | SeeAlso [cuddInitTable] |
---|
| 646 | |
---|
| 647 | ******************************************************************************/ |
---|
| 648 | void |
---|
| 649 | cuddFreeTable( |
---|
| 650 | DdManager * unique) |
---|
| 651 | { |
---|
| 652 | DdNodePtr *next; |
---|
| 653 | DdNodePtr *memlist = unique->memoryList; |
---|
| 654 | int i; |
---|
| 655 | |
---|
| 656 | if (unique->univ != NULL) cuddZddFreeUniv(unique); |
---|
| 657 | while (memlist != NULL) { |
---|
| 658 | next = (DdNodePtr *) memlist[0]; /* link to next block */ |
---|
| 659 | FREE(memlist); |
---|
| 660 | memlist = next; |
---|
| 661 | } |
---|
| 662 | unique->nextFree = NULL; |
---|
| 663 | unique->memoryList = NULL; |
---|
| 664 | |
---|
| 665 | for (i = 0; i < unique->size; i++) { |
---|
| 666 | FREE(unique->subtables[i].nodelist); |
---|
| 667 | } |
---|
| 668 | for (i = 0; i < unique->sizeZ; i++) { |
---|
| 669 | FREE(unique->subtableZ[i].nodelist); |
---|
| 670 | } |
---|
| 671 | FREE(unique->constants.nodelist); |
---|
| 672 | FREE(unique->subtables); |
---|
| 673 | FREE(unique->subtableZ); |
---|
| 674 | FREE(unique->acache); |
---|
| 675 | FREE(unique->perm); |
---|
| 676 | FREE(unique->permZ); |
---|
| 677 | FREE(unique->invperm); |
---|
| 678 | FREE(unique->invpermZ); |
---|
| 679 | FREE(unique->vars); |
---|
| 680 | if (unique->map != NULL) FREE(unique->map); |
---|
| 681 | FREE(unique->stack); |
---|
| 682 | #ifndef DD_NO_DEATH_ROW |
---|
| 683 | FREE(unique->deathRow); |
---|
| 684 | #endif |
---|
| 685 | if (unique->tree != NULL) Mtr_FreeTree(unique->tree); |
---|
| 686 | if (unique->treeZ != NULL) Mtr_FreeTree(unique->treeZ); |
---|
| 687 | if (unique->linear != NULL) FREE(unique->linear); |
---|
| 688 | while (unique->preGCHook != NULL) |
---|
| 689 | Cudd_RemoveHook(unique,unique->preGCHook->f,CUDD_PRE_GC_HOOK); |
---|
| 690 | while (unique->postGCHook != NULL) |
---|
| 691 | Cudd_RemoveHook(unique,unique->postGCHook->f,CUDD_POST_GC_HOOK); |
---|
| 692 | while (unique->preReorderingHook != NULL) |
---|
| 693 | Cudd_RemoveHook(unique,unique->preReorderingHook->f, |
---|
| 694 | CUDD_PRE_REORDERING_HOOK); |
---|
| 695 | while (unique->postReorderingHook != NULL) |
---|
| 696 | Cudd_RemoveHook(unique,unique->postReorderingHook->f, |
---|
| 697 | CUDD_POST_REORDERING_HOOK); |
---|
| 698 | FREE(unique); |
---|
| 699 | |
---|
| 700 | } /* end of cuddFreeTable */ |
---|
| 701 | |
---|
| 702 | |
---|
| 703 | /**Function******************************************************************** |
---|
| 704 | |
---|
| 705 | Synopsis [Performs garbage collection on the unique tables.] |
---|
| 706 | |
---|
| 707 | Description [Performs garbage collection on the BDD and ZDD unique tables. |
---|
| 708 | If clearCache is 0, the cache is not cleared. This should only be |
---|
| 709 | specified if the cache has been cleared right before calling |
---|
| 710 | cuddGarbageCollect. (As in the case of dynamic reordering.) |
---|
| 711 | Returns the total number of deleted nodes.] |
---|
| 712 | |
---|
| 713 | SideEffects [None] |
---|
| 714 | |
---|
| 715 | SeeAlso [] |
---|
| 716 | |
---|
| 717 | ******************************************************************************/ |
---|
| 718 | int |
---|
| 719 | cuddGarbageCollect( |
---|
| 720 | DdManager * unique, |
---|
| 721 | int clearCache) |
---|
| 722 | { |
---|
| 723 | DdHook *hook; |
---|
| 724 | DdCache *cache = unique->cache; |
---|
| 725 | DdNode *sentinel = &(unique->sentinel); |
---|
| 726 | DdNodePtr *nodelist; |
---|
| 727 | int i, j, deleted, totalDeleted, totalDeletedZ; |
---|
| 728 | DdCache *c; |
---|
| 729 | DdNode *node,*next; |
---|
| 730 | DdNodePtr *lastP; |
---|
| 731 | int slots; |
---|
| 732 | long localTime; |
---|
| 733 | #ifndef DD_UNSORTED_FREE_LIST |
---|
| 734 | #ifdef DD_RED_BLACK_FREE_LIST |
---|
| 735 | DdNodePtr tree; |
---|
| 736 | #else |
---|
| 737 | DdNodePtr *memListTrav, *nxtNode; |
---|
| 738 | DdNode *downTrav, *sentry; |
---|
| 739 | int k; |
---|
| 740 | #endif |
---|
| 741 | #endif |
---|
| 742 | |
---|
| 743 | #ifndef DD_NO_DEATH_ROW |
---|
| 744 | cuddClearDeathRow(unique); |
---|
| 745 | #endif |
---|
| 746 | |
---|
| 747 | hook = unique->preGCHook; |
---|
| 748 | while (hook != NULL) { |
---|
| 749 | int res = (hook->f)(unique,"DD",NULL); |
---|
| 750 | if (res == 0) return(0); |
---|
| 751 | hook = hook->next; |
---|
| 752 | } |
---|
| 753 | |
---|
| 754 | if (unique->dead + unique->deadZ == 0) { |
---|
| 755 | hook = unique->postGCHook; |
---|
| 756 | while (hook != NULL) { |
---|
| 757 | int res = (hook->f)(unique,"DD",NULL); |
---|
| 758 | if (res == 0) return(0); |
---|
| 759 | hook = hook->next; |
---|
| 760 | } |
---|
| 761 | return(0); |
---|
| 762 | } |
---|
| 763 | |
---|
| 764 | /* If many nodes are being reclaimed, we want to resize the tables |
---|
| 765 | ** more aggressively, to reduce the frequency of garbage collection. |
---|
| 766 | */ |
---|
| 767 | if (clearCache && unique->gcFrac == DD_GC_FRAC_LO && |
---|
| 768 | unique->slots <= unique->looseUpTo && unique->stash != NULL) { |
---|
| 769 | unique->minDead = (unsigned) (DD_GC_FRAC_HI * (double) unique->slots); |
---|
| 770 | #ifdef DD_VERBOSE |
---|
| 771 | (void) fprintf(unique->err,"GC fraction = %.2f\t", DD_GC_FRAC_HI); |
---|
| 772 | (void) fprintf(unique->err,"minDead = %d\n", unique->minDead); |
---|
| 773 | #endif |
---|
| 774 | unique->gcFrac = DD_GC_FRAC_HI; |
---|
| 775 | return(0); |
---|
| 776 | } |
---|
| 777 | |
---|
| 778 | localTime = util_cpu_time(); |
---|
| 779 | |
---|
| 780 | unique->garbageCollections++; |
---|
| 781 | #ifdef DD_VERBOSE |
---|
| 782 | (void) fprintf(unique->err, |
---|
| 783 | "garbage collecting (%d dead BDD nodes out of %d, min %d)...", |
---|
| 784 | unique->dead, unique->keys, unique->minDead); |
---|
| 785 | (void) fprintf(unique->err, |
---|
| 786 | " (%d dead ZDD nodes out of %d)...", |
---|
| 787 | unique->deadZ, unique->keysZ); |
---|
| 788 | #endif |
---|
| 789 | |
---|
| 790 | /* Remove references to garbage collected nodes from the cache. */ |
---|
| 791 | if (clearCache) { |
---|
| 792 | slots = unique->cacheSlots; |
---|
| 793 | for (i = 0; i < slots; i++) { |
---|
| 794 | c = &cache[i]; |
---|
| 795 | if (c->data != NULL) { |
---|
| 796 | if (cuddClean(c->f)->ref == 0 || |
---|
| 797 | cuddClean(c->g)->ref == 0 || |
---|
| 798 | (((ptruint)c->f & 0x2) && Cudd_Regular(c->h)->ref == 0) || |
---|
| 799 | (c->data != DD_NON_CONSTANT && |
---|
| 800 | Cudd_Regular(c->data)->ref == 0)) { |
---|
| 801 | c->data = NULL; |
---|
| 802 | unique->cachedeletions++; |
---|
| 803 | } |
---|
| 804 | } |
---|
| 805 | } |
---|
| 806 | cuddLocalCacheClearDead(unique); |
---|
| 807 | } |
---|
| 808 | |
---|
| 809 | /* Now return dead nodes to free list. Count them for sanity check. */ |
---|
| 810 | totalDeleted = 0; |
---|
| 811 | #ifndef DD_UNSORTED_FREE_LIST |
---|
| 812 | #ifdef DD_RED_BLACK_FREE_LIST |
---|
| 813 | tree = NULL; |
---|
| 814 | #endif |
---|
| 815 | #endif |
---|
| 816 | |
---|
| 817 | for (i = 0; i < unique->size; i++) { |
---|
| 818 | if (unique->subtables[i].dead == 0) continue; |
---|
| 819 | nodelist = unique->subtables[i].nodelist; |
---|
| 820 | |
---|
| 821 | deleted = 0; |
---|
| 822 | slots = unique->subtables[i].slots; |
---|
| 823 | for (j = 0; j < slots; j++) { |
---|
| 824 | lastP = &(nodelist[j]); |
---|
| 825 | node = *lastP; |
---|
| 826 | while (node != sentinel) { |
---|
| 827 | next = node->next; |
---|
| 828 | if (node->ref == 0) { |
---|
| 829 | deleted++; |
---|
| 830 | #ifndef DD_UNSORTED_FREE_LIST |
---|
| 831 | #ifdef DD_RED_BLACK_FREE_LIST |
---|
| 832 | #ifdef __osf__ |
---|
| 833 | #pragma pointer_size save |
---|
| 834 | #pragma pointer_size short |
---|
| 835 | #endif |
---|
| 836 | cuddOrderedInsert(&tree,node); |
---|
| 837 | #ifdef __osf__ |
---|
| 838 | #pragma pointer_size restore |
---|
| 839 | #endif |
---|
| 840 | #endif |
---|
| 841 | #else |
---|
| 842 | cuddDeallocNode(unique,node); |
---|
| 843 | #endif |
---|
| 844 | } else { |
---|
| 845 | *lastP = node; |
---|
| 846 | lastP = &(node->next); |
---|
| 847 | } |
---|
| 848 | node = next; |
---|
| 849 | } |
---|
| 850 | *lastP = sentinel; |
---|
| 851 | } |
---|
| 852 | if ((unsigned) deleted != unique->subtables[i].dead) { |
---|
| 853 | ddReportRefMess(unique, i, "cuddGarbageCollect"); |
---|
| 854 | } |
---|
| 855 | totalDeleted += deleted; |
---|
| 856 | unique->subtables[i].keys -= deleted; |
---|
| 857 | unique->subtables[i].dead = 0; |
---|
| 858 | } |
---|
| 859 | if (unique->constants.dead != 0) { |
---|
| 860 | nodelist = unique->constants.nodelist; |
---|
| 861 | deleted = 0; |
---|
| 862 | slots = unique->constants.slots; |
---|
| 863 | for (j = 0; j < slots; j++) { |
---|
| 864 | lastP = &(nodelist[j]); |
---|
| 865 | node = *lastP; |
---|
| 866 | while (node != NULL) { |
---|
| 867 | next = node->next; |
---|
| 868 | if (node->ref == 0) { |
---|
| 869 | deleted++; |
---|
| 870 | #ifndef DD_UNSORTED_FREE_LIST |
---|
| 871 | #ifdef DD_RED_BLACK_FREE_LIST |
---|
| 872 | #ifdef __osf__ |
---|
| 873 | #pragma pointer_size save |
---|
| 874 | #pragma pointer_size short |
---|
| 875 | #endif |
---|
| 876 | cuddOrderedInsert(&tree,node); |
---|
| 877 | #ifdef __osf__ |
---|
| 878 | #pragma pointer_size restore |
---|
| 879 | #endif |
---|
| 880 | #endif |
---|
| 881 | #else |
---|
| 882 | cuddDeallocNode(unique,node); |
---|
| 883 | #endif |
---|
| 884 | } else { |
---|
| 885 | *lastP = node; |
---|
| 886 | lastP = &(node->next); |
---|
| 887 | } |
---|
| 888 | node = next; |
---|
| 889 | } |
---|
| 890 | *lastP = NULL; |
---|
| 891 | } |
---|
| 892 | if ((unsigned) deleted != unique->constants.dead) { |
---|
| 893 | ddReportRefMess(unique, CUDD_CONST_INDEX, "cuddGarbageCollect"); |
---|
| 894 | } |
---|
| 895 | totalDeleted += deleted; |
---|
| 896 | unique->constants.keys -= deleted; |
---|
| 897 | unique->constants.dead = 0; |
---|
| 898 | } |
---|
| 899 | if ((unsigned) totalDeleted != unique->dead) { |
---|
| 900 | ddReportRefMess(unique, -1, "cuddGarbageCollect"); |
---|
| 901 | } |
---|
| 902 | unique->keys -= totalDeleted; |
---|
| 903 | unique->dead = 0; |
---|
| 904 | #ifdef DD_STATS |
---|
| 905 | unique->nodesFreed += (double) totalDeleted; |
---|
| 906 | #endif |
---|
| 907 | |
---|
| 908 | totalDeletedZ = 0; |
---|
| 909 | |
---|
| 910 | for (i = 0; i < unique->sizeZ; i++) { |
---|
| 911 | if (unique->subtableZ[i].dead == 0) continue; |
---|
| 912 | nodelist = unique->subtableZ[i].nodelist; |
---|
| 913 | |
---|
| 914 | deleted = 0; |
---|
| 915 | slots = unique->subtableZ[i].slots; |
---|
| 916 | for (j = 0; j < slots; j++) { |
---|
| 917 | lastP = &(nodelist[j]); |
---|
| 918 | node = *lastP; |
---|
| 919 | while (node != NULL) { |
---|
| 920 | next = node->next; |
---|
| 921 | if (node->ref == 0) { |
---|
| 922 | deleted++; |
---|
| 923 | #ifndef DD_UNSORTED_FREE_LIST |
---|
| 924 | #ifdef DD_RED_BLACK_FREE_LIST |
---|
| 925 | #ifdef __osf__ |
---|
| 926 | #pragma pointer_size save |
---|
| 927 | #pragma pointer_size short |
---|
| 928 | #endif |
---|
| 929 | cuddOrderedInsert(&tree,node); |
---|
| 930 | #ifdef __osf__ |
---|
| 931 | #pragma pointer_size restore |
---|
| 932 | #endif |
---|
| 933 | #endif |
---|
| 934 | #else |
---|
| 935 | cuddDeallocNode(unique,node); |
---|
| 936 | #endif |
---|
| 937 | } else { |
---|
| 938 | *lastP = node; |
---|
| 939 | lastP = &(node->next); |
---|
| 940 | } |
---|
| 941 | node = next; |
---|
| 942 | } |
---|
| 943 | *lastP = NULL; |
---|
| 944 | } |
---|
| 945 | if ((unsigned) deleted != unique->subtableZ[i].dead) { |
---|
| 946 | ddReportRefMess(unique, i, "cuddGarbageCollect"); |
---|
| 947 | } |
---|
| 948 | totalDeletedZ += deleted; |
---|
| 949 | unique->subtableZ[i].keys -= deleted; |
---|
| 950 | unique->subtableZ[i].dead = 0; |
---|
| 951 | } |
---|
| 952 | |
---|
| 953 | /* No need to examine the constant table for ZDDs. |
---|
| 954 | ** If we did we should be careful not to count whatever dead |
---|
| 955 | ** nodes we found there among the dead ZDD nodes. */ |
---|
| 956 | if ((unsigned) totalDeletedZ != unique->deadZ) { |
---|
| 957 | ddReportRefMess(unique, -1, "cuddGarbageCollect"); |
---|
| 958 | } |
---|
| 959 | unique->keysZ -= totalDeletedZ; |
---|
| 960 | unique->deadZ = 0; |
---|
| 961 | #ifdef DD_STATS |
---|
| 962 | unique->nodesFreed += (double) totalDeletedZ; |
---|
| 963 | #endif |
---|
| 964 | |
---|
| 965 | |
---|
| 966 | #ifndef DD_UNSORTED_FREE_LIST |
---|
| 967 | #ifdef DD_RED_BLACK_FREE_LIST |
---|
| 968 | unique->nextFree = cuddOrderedThread(tree,unique->nextFree); |
---|
| 969 | #else |
---|
| 970 | memListTrav = unique->memoryList; |
---|
| 971 | sentry = NULL; |
---|
| 972 | while (memListTrav != NULL) { |
---|
| 973 | ptruint offset; |
---|
| 974 | nxtNode = (DdNodePtr *)memListTrav[0]; |
---|
| 975 | offset = (ptruint) memListTrav & (sizeof(DdNode) - 1); |
---|
| 976 | memListTrav += (sizeof(DdNode) - offset) / sizeof(DdNodePtr); |
---|
| 977 | downTrav = (DdNode *)memListTrav; |
---|
| 978 | k = 0; |
---|
| 979 | do { |
---|
| 980 | if (downTrav[k].ref == 0) { |
---|
| 981 | if (sentry == NULL) { |
---|
| 982 | unique->nextFree = sentry = &downTrav[k]; |
---|
| 983 | } else { |
---|
| 984 | /* First hook sentry->next to the dead node and then |
---|
| 985 | ** reassign sentry to the dead node. */ |
---|
| 986 | sentry = (sentry->next = &downTrav[k]); |
---|
| 987 | } |
---|
| 988 | } |
---|
| 989 | } while (++k < DD_MEM_CHUNK); |
---|
| 990 | memListTrav = nxtNode; |
---|
| 991 | } |
---|
| 992 | sentry->next = NULL; |
---|
| 993 | #endif |
---|
| 994 | #endif |
---|
| 995 | |
---|
| 996 | unique->GCTime += util_cpu_time() - localTime; |
---|
| 997 | |
---|
| 998 | hook = unique->postGCHook; |
---|
| 999 | while (hook != NULL) { |
---|
| 1000 | int res = (hook->f)(unique,"DD",NULL); |
---|
| 1001 | if (res == 0) return(0); |
---|
| 1002 | hook = hook->next; |
---|
| 1003 | } |
---|
| 1004 | |
---|
| 1005 | #ifdef DD_VERBOSE |
---|
| 1006 | (void) fprintf(unique->err," done\n"); |
---|
| 1007 | #endif |
---|
| 1008 | |
---|
| 1009 | return(totalDeleted+totalDeletedZ); |
---|
| 1010 | |
---|
| 1011 | } /* end of cuddGarbageCollect */ |
---|
| 1012 | |
---|
| 1013 | |
---|
| 1014 | /**Function******************************************************************** |
---|
| 1015 | |
---|
| 1016 | Synopsis [Wrapper for cuddUniqueInterZdd.] |
---|
| 1017 | |
---|
| 1018 | Description [Wrapper for cuddUniqueInterZdd, which applies the ZDD |
---|
| 1019 | reduction rule. Returns a pointer to the result node under normal |
---|
| 1020 | conditions; NULL if reordering occurred or memory was exhausted.] |
---|
| 1021 | |
---|
| 1022 | SideEffects [None] |
---|
| 1023 | |
---|
| 1024 | SeeAlso [cuddUniqueInterZdd] |
---|
| 1025 | |
---|
| 1026 | ******************************************************************************/ |
---|
| 1027 | DdNode * |
---|
| 1028 | cuddZddGetNode( |
---|
| 1029 | DdManager * zdd, |
---|
| 1030 | int id, |
---|
| 1031 | DdNode * T, |
---|
| 1032 | DdNode * E) |
---|
| 1033 | { |
---|
| 1034 | DdNode *node; |
---|
| 1035 | |
---|
| 1036 | if (T == DD_ZERO(zdd)) |
---|
| 1037 | return(E); |
---|
| 1038 | node = cuddUniqueInterZdd(zdd, id, T, E); |
---|
| 1039 | return(node); |
---|
| 1040 | |
---|
| 1041 | } /* end of cuddZddGetNode */ |
---|
| 1042 | |
---|
| 1043 | |
---|
| 1044 | /**Function******************************************************************** |
---|
| 1045 | |
---|
| 1046 | Synopsis [Wrapper for cuddUniqueInterZdd that is independent of variable |
---|
| 1047 | ordering.] |
---|
| 1048 | |
---|
| 1049 | Description [Wrapper for cuddUniqueInterZdd that is independent of |
---|
| 1050 | variable ordering (IVO). This function does not require parameter |
---|
| 1051 | index to precede the indices of the top nodes of g and h in the |
---|
| 1052 | variable order. Returns a pointer to the result node under normal |
---|
| 1053 | conditions; NULL if reordering occurred or memory was exhausted.] |
---|
| 1054 | |
---|
| 1055 | SideEffects [None] |
---|
| 1056 | |
---|
| 1057 | SeeAlso [cuddZddGetNode cuddZddIsop] |
---|
| 1058 | |
---|
| 1059 | ******************************************************************************/ |
---|
| 1060 | DdNode * |
---|
| 1061 | cuddZddGetNodeIVO( |
---|
| 1062 | DdManager * dd, |
---|
| 1063 | int index, |
---|
| 1064 | DdNode * g, |
---|
| 1065 | DdNode * h) |
---|
| 1066 | { |
---|
| 1067 | DdNode *f, *r, *t; |
---|
| 1068 | DdNode *zdd_one = DD_ONE(dd); |
---|
| 1069 | DdNode *zdd_zero = DD_ZERO(dd); |
---|
| 1070 | |
---|
| 1071 | f = cuddUniqueInterZdd(dd, index, zdd_one, zdd_zero); |
---|
| 1072 | if (f == NULL) { |
---|
| 1073 | return(NULL); |
---|
| 1074 | } |
---|
| 1075 | cuddRef(f); |
---|
| 1076 | t = cuddZddProduct(dd, f, g); |
---|
| 1077 | if (t == NULL) { |
---|
| 1078 | Cudd_RecursiveDerefZdd(dd, f); |
---|
| 1079 | return(NULL); |
---|
| 1080 | } |
---|
| 1081 | cuddRef(t); |
---|
| 1082 | Cudd_RecursiveDerefZdd(dd, f); |
---|
| 1083 | r = cuddZddUnion(dd, t, h); |
---|
| 1084 | if (r == NULL) { |
---|
| 1085 | Cudd_RecursiveDerefZdd(dd, t); |
---|
| 1086 | return(NULL); |
---|
| 1087 | } |
---|
| 1088 | cuddRef(r); |
---|
| 1089 | Cudd_RecursiveDerefZdd(dd, t); |
---|
| 1090 | |
---|
| 1091 | cuddDeref(r); |
---|
| 1092 | return(r); |
---|
| 1093 | |
---|
| 1094 | } /* end of cuddZddGetNodeIVO */ |
---|
| 1095 | |
---|
| 1096 | |
---|
| 1097 | /**Function******************************************************************** |
---|
| 1098 | |
---|
| 1099 | Synopsis [Checks the unique table for the existence of an internal node.] |
---|
| 1100 | |
---|
| 1101 | Description [Checks the unique table for the existence of an internal |
---|
| 1102 | node. If it does not exist, it creates a new one. Does not |
---|
| 1103 | modify the reference count of whatever is returned. A newly created |
---|
| 1104 | internal node comes back with a reference count 0. For a newly |
---|
| 1105 | created node, increments the reference counts of what T and E point |
---|
| 1106 | to. Returns a pointer to the new node if successful; NULL if memory |
---|
| 1107 | is exhausted or if reordering took place.] |
---|
| 1108 | |
---|
| 1109 | SideEffects [None] |
---|
| 1110 | |
---|
| 1111 | SeeAlso [cuddUniqueInterZdd] |
---|
| 1112 | |
---|
| 1113 | ******************************************************************************/ |
---|
| 1114 | DdNode * |
---|
| 1115 | cuddUniqueInter( |
---|
| 1116 | DdManager * unique, |
---|
| 1117 | int index, |
---|
| 1118 | DdNode * T, |
---|
| 1119 | DdNode * E) |
---|
| 1120 | { |
---|
| 1121 | int pos; |
---|
| 1122 | unsigned int level; |
---|
| 1123 | int retval; |
---|
| 1124 | DdNodePtr *nodelist; |
---|
| 1125 | DdNode *looking; |
---|
| 1126 | DdNodePtr *previousP; |
---|
| 1127 | DdSubtable *subtable; |
---|
| 1128 | int gcNumber; |
---|
| 1129 | |
---|
| 1130 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1131 | unique->uniqueLookUps++; |
---|
| 1132 | #endif |
---|
| 1133 | |
---|
| 1134 | if (index >= unique->size) { |
---|
| 1135 | if (!ddResizeTable(unique,index)) return(NULL); |
---|
| 1136 | } |
---|
| 1137 | |
---|
| 1138 | level = unique->perm[index]; |
---|
| 1139 | subtable = &(unique->subtables[level]); |
---|
| 1140 | |
---|
| 1141 | #ifdef DD_DEBUG |
---|
| 1142 | assert(level < (unsigned) cuddI(unique,T->index)); |
---|
| 1143 | assert(level < (unsigned) cuddI(unique,Cudd_Regular(E)->index)); |
---|
| 1144 | #endif |
---|
| 1145 | |
---|
| 1146 | pos = ddHash(T, E, subtable->shift); |
---|
| 1147 | nodelist = subtable->nodelist; |
---|
| 1148 | previousP = &(nodelist[pos]); |
---|
| 1149 | looking = *previousP; |
---|
| 1150 | |
---|
| 1151 | while (T < cuddT(looking)) { |
---|
| 1152 | previousP = &(looking->next); |
---|
| 1153 | looking = *previousP; |
---|
| 1154 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1155 | unique->uniqueLinks++; |
---|
| 1156 | #endif |
---|
| 1157 | } |
---|
| 1158 | while (T == cuddT(looking) && E < cuddE(looking)) { |
---|
| 1159 | previousP = &(looking->next); |
---|
| 1160 | looking = *previousP; |
---|
| 1161 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1162 | unique->uniqueLinks++; |
---|
| 1163 | #endif |
---|
| 1164 | } |
---|
| 1165 | if (T == cuddT(looking) && E == cuddE(looking)) { |
---|
| 1166 | if (looking->ref == 0) { |
---|
| 1167 | cuddReclaim(unique,looking); |
---|
| 1168 | } |
---|
| 1169 | return(looking); |
---|
| 1170 | } |
---|
| 1171 | |
---|
| 1172 | /* countDead is 0 if deads should be counted and ~0 if they should not. */ |
---|
| 1173 | if (unique->autoDyn && |
---|
| 1174 | unique->keys - (unique->dead & unique->countDead) >= unique->nextDyn) { |
---|
| 1175 | #ifdef DD_DEBUG |
---|
| 1176 | retval = Cudd_DebugCheck(unique); |
---|
| 1177 | if (retval != 0) return(NULL); |
---|
| 1178 | retval = Cudd_CheckKeys(unique); |
---|
| 1179 | if (retval != 0) return(NULL); |
---|
| 1180 | #endif |
---|
| 1181 | retval = Cudd_ReduceHeap(unique,unique->autoMethod,10); /* 10 = whatever */ |
---|
| 1182 | if (retval == 0) unique->reordered = 2; |
---|
| 1183 | #ifdef DD_DEBUG |
---|
| 1184 | retval = Cudd_DebugCheck(unique); |
---|
| 1185 | if (retval != 0) unique->reordered = 2; |
---|
| 1186 | retval = Cudd_CheckKeys(unique); |
---|
| 1187 | if (retval != 0) unique->reordered = 2; |
---|
| 1188 | #endif |
---|
| 1189 | return(NULL); |
---|
| 1190 | } |
---|
| 1191 | |
---|
| 1192 | if (subtable->keys > subtable->maxKeys) { |
---|
| 1193 | if (unique->gcEnabled && |
---|
| 1194 | ((unique->dead > unique->minDead) || |
---|
| 1195 | ((unique->dead > unique->minDead / 2) && |
---|
| 1196 | (subtable->dead > subtable->keys * 0.95)))) { /* too many dead */ |
---|
| 1197 | (void) cuddGarbageCollect(unique,1); |
---|
| 1198 | } else { |
---|
| 1199 | cuddRehash(unique,(int)level); |
---|
| 1200 | } |
---|
| 1201 | /* Update pointer to insertion point. In the case of rehashing, |
---|
| 1202 | ** the slot may have changed. In the case of garbage collection, |
---|
| 1203 | ** the predecessor may have been dead. */ |
---|
| 1204 | pos = ddHash(T, E, subtable->shift); |
---|
| 1205 | nodelist = subtable->nodelist; |
---|
| 1206 | previousP = &(nodelist[pos]); |
---|
| 1207 | looking = *previousP; |
---|
| 1208 | |
---|
| 1209 | while (T < cuddT(looking)) { |
---|
| 1210 | previousP = &(looking->next); |
---|
| 1211 | looking = *previousP; |
---|
| 1212 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1213 | unique->uniqueLinks++; |
---|
| 1214 | #endif |
---|
| 1215 | } |
---|
| 1216 | while (T == cuddT(looking) && E < cuddE(looking)) { |
---|
| 1217 | previousP = &(looking->next); |
---|
| 1218 | looking = *previousP; |
---|
| 1219 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1220 | unique->uniqueLinks++; |
---|
| 1221 | #endif |
---|
| 1222 | } |
---|
| 1223 | } |
---|
| 1224 | |
---|
| 1225 | gcNumber = unique->garbageCollections; |
---|
| 1226 | looking = cuddAllocNode(unique); |
---|
| 1227 | if (looking == NULL) { |
---|
| 1228 | return(NULL); |
---|
| 1229 | } |
---|
| 1230 | unique->keys++; |
---|
| 1231 | subtable->keys++; |
---|
| 1232 | |
---|
| 1233 | if (gcNumber != unique->garbageCollections) { |
---|
| 1234 | DdNode *looking2; |
---|
| 1235 | pos = ddHash(T, E, subtable->shift); |
---|
| 1236 | nodelist = subtable->nodelist; |
---|
| 1237 | previousP = &(nodelist[pos]); |
---|
| 1238 | looking2 = *previousP; |
---|
| 1239 | |
---|
| 1240 | while (T < cuddT(looking2)) { |
---|
| 1241 | previousP = &(looking2->next); |
---|
| 1242 | looking2 = *previousP; |
---|
| 1243 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1244 | unique->uniqueLinks++; |
---|
| 1245 | #endif |
---|
| 1246 | } |
---|
| 1247 | while (T == cuddT(looking2) && E < cuddE(looking2)) { |
---|
| 1248 | previousP = &(looking2->next); |
---|
| 1249 | looking2 = *previousP; |
---|
| 1250 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1251 | unique->uniqueLinks++; |
---|
| 1252 | #endif |
---|
| 1253 | } |
---|
| 1254 | } |
---|
| 1255 | looking->index = index; |
---|
| 1256 | cuddT(looking) = T; |
---|
| 1257 | cuddE(looking) = E; |
---|
| 1258 | looking->next = *previousP; |
---|
| 1259 | *previousP = looking; |
---|
| 1260 | cuddSatInc(T->ref); /* we know T is a regular pointer */ |
---|
| 1261 | cuddRef(E); |
---|
| 1262 | |
---|
| 1263 | #ifdef DD_DEBUG |
---|
| 1264 | cuddCheckCollisionOrdering(unique,level,pos); |
---|
| 1265 | #endif |
---|
| 1266 | |
---|
| 1267 | return(looking); |
---|
| 1268 | |
---|
| 1269 | } /* end of cuddUniqueInter */ |
---|
| 1270 | |
---|
| 1271 | |
---|
| 1272 | /**Function******************************************************************** |
---|
| 1273 | |
---|
| 1274 | Synopsis [Wrapper for cuddUniqueInter that is independent of variable |
---|
| 1275 | ordering.] |
---|
| 1276 | |
---|
| 1277 | Description [Wrapper for cuddUniqueInter that is independent of |
---|
| 1278 | variable ordering (IVO). This function does not require parameter |
---|
| 1279 | index to precede the indices of the top nodes of T and E in the |
---|
| 1280 | variable order. Returns a pointer to the result node under normal |
---|
| 1281 | conditions; NULL if reordering occurred or memory was exhausted.] |
---|
| 1282 | |
---|
| 1283 | SideEffects [None] |
---|
| 1284 | |
---|
| 1285 | SeeAlso [cuddUniqueInter Cudd_MakeBddFromZddCover] |
---|
| 1286 | |
---|
| 1287 | ******************************************************************************/ |
---|
| 1288 | DdNode * |
---|
| 1289 | cuddUniqueInterIVO( |
---|
| 1290 | DdManager * unique, |
---|
| 1291 | int index, |
---|
| 1292 | DdNode * T, |
---|
| 1293 | DdNode * E) |
---|
| 1294 | { |
---|
| 1295 | DdNode *result; |
---|
| 1296 | DdNode *v; |
---|
| 1297 | |
---|
| 1298 | v = cuddUniqueInter(unique, index, DD_ONE(unique), |
---|
| 1299 | Cudd_Not(DD_ONE(unique))); |
---|
| 1300 | if (v == NULL) |
---|
| 1301 | return(NULL); |
---|
| 1302 | cuddRef(v); |
---|
| 1303 | result = cuddBddIteRecur(unique, v, T, E); |
---|
| 1304 | Cudd_RecursiveDeref(unique, v); |
---|
| 1305 | return(result); |
---|
| 1306 | } |
---|
| 1307 | |
---|
| 1308 | |
---|
| 1309 | /**Function******************************************************************** |
---|
| 1310 | |
---|
| 1311 | Synopsis [Checks the unique table for the existence of an internal |
---|
| 1312 | ZDD node.] |
---|
| 1313 | |
---|
| 1314 | Description [Checks the unique table for the existence of an internal |
---|
| 1315 | ZDD node. If it does not exist, it creates a new one. Does not |
---|
| 1316 | modify the reference count of whatever is returned. A newly created |
---|
| 1317 | internal node comes back with a reference count 0. For a newly |
---|
| 1318 | created node, increments the reference counts of what T and E point |
---|
| 1319 | to. Returns a pointer to the new node if successful; NULL if memory |
---|
| 1320 | is exhausted or if reordering took place.] |
---|
| 1321 | |
---|
| 1322 | SideEffects [None] |
---|
| 1323 | |
---|
| 1324 | SeeAlso [cuddUniqueInter] |
---|
| 1325 | |
---|
| 1326 | ******************************************************************************/ |
---|
| 1327 | DdNode * |
---|
| 1328 | cuddUniqueInterZdd( |
---|
| 1329 | DdManager * unique, |
---|
| 1330 | int index, |
---|
| 1331 | DdNode * T, |
---|
| 1332 | DdNode * E) |
---|
| 1333 | { |
---|
| 1334 | int pos; |
---|
| 1335 | unsigned int level; |
---|
| 1336 | int retval; |
---|
| 1337 | DdNodePtr *nodelist; |
---|
| 1338 | DdNode *looking; |
---|
| 1339 | DdSubtable *subtable; |
---|
| 1340 | |
---|
| 1341 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1342 | unique->uniqueLookUps++; |
---|
| 1343 | #endif |
---|
| 1344 | |
---|
| 1345 | if (index >= unique->sizeZ) { |
---|
| 1346 | if (!cuddResizeTableZdd(unique,index)) return(NULL); |
---|
| 1347 | } |
---|
| 1348 | |
---|
| 1349 | level = unique->permZ[index]; |
---|
| 1350 | subtable = &(unique->subtableZ[level]); |
---|
| 1351 | |
---|
| 1352 | #ifdef DD_DEBUG |
---|
| 1353 | assert(level < (unsigned) cuddIZ(unique,T->index)); |
---|
| 1354 | assert(level < (unsigned) cuddIZ(unique,Cudd_Regular(E)->index)); |
---|
| 1355 | #endif |
---|
| 1356 | |
---|
| 1357 | if (subtable->keys > subtable->maxKeys) { |
---|
| 1358 | if (unique->gcEnabled && ((unique->deadZ > unique->minDead) || |
---|
| 1359 | (10 * subtable->dead > 9 * subtable->keys))) { /* too many dead */ |
---|
| 1360 | (void) cuddGarbageCollect(unique,1); |
---|
| 1361 | } else { |
---|
| 1362 | ddRehashZdd(unique,(int)level); |
---|
| 1363 | } |
---|
| 1364 | } |
---|
| 1365 | |
---|
| 1366 | pos = ddHash(T, E, subtable->shift); |
---|
| 1367 | nodelist = subtable->nodelist; |
---|
| 1368 | looking = nodelist[pos]; |
---|
| 1369 | |
---|
| 1370 | while (looking != NULL) { |
---|
| 1371 | if (cuddT(looking) == T && cuddE(looking) == E) { |
---|
| 1372 | if (looking->ref == 0) { |
---|
| 1373 | cuddReclaimZdd(unique,looking); |
---|
| 1374 | } |
---|
| 1375 | return(looking); |
---|
| 1376 | } |
---|
| 1377 | looking = looking->next; |
---|
| 1378 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1379 | unique->uniqueLinks++; |
---|
| 1380 | #endif |
---|
| 1381 | } |
---|
| 1382 | |
---|
| 1383 | /* countDead is 0 if deads should be counted and ~0 if they should not. */ |
---|
| 1384 | if (unique->autoDynZ && |
---|
| 1385 | unique->keysZ - (unique->deadZ & unique->countDead) >= unique->nextDyn) { |
---|
| 1386 | #ifdef DD_DEBUG |
---|
| 1387 | retval = Cudd_DebugCheck(unique); |
---|
| 1388 | if (retval != 0) return(NULL); |
---|
| 1389 | retval = Cudd_CheckKeys(unique); |
---|
| 1390 | if (retval != 0) return(NULL); |
---|
| 1391 | #endif |
---|
| 1392 | retval = Cudd_zddReduceHeap(unique,unique->autoMethodZ,10); /* 10 = whatever */ |
---|
| 1393 | if (retval == 0) unique->reordered = 2; |
---|
| 1394 | #ifdef DD_DEBUG |
---|
| 1395 | retval = Cudd_DebugCheck(unique); |
---|
| 1396 | if (retval != 0) unique->reordered = 2; |
---|
| 1397 | retval = Cudd_CheckKeys(unique); |
---|
| 1398 | if (retval != 0) unique->reordered = 2; |
---|
| 1399 | #endif |
---|
| 1400 | return(NULL); |
---|
| 1401 | } |
---|
| 1402 | |
---|
| 1403 | unique->keysZ++; |
---|
| 1404 | subtable->keys++; |
---|
| 1405 | |
---|
| 1406 | looking = cuddAllocNode(unique); |
---|
| 1407 | if (looking == NULL) return(NULL); |
---|
| 1408 | looking->index = index; |
---|
| 1409 | cuddT(looking) = T; |
---|
| 1410 | cuddE(looking) = E; |
---|
| 1411 | looking->next = nodelist[pos]; |
---|
| 1412 | nodelist[pos] = looking; |
---|
| 1413 | cuddRef(T); |
---|
| 1414 | cuddRef(E); |
---|
| 1415 | |
---|
| 1416 | return(looking); |
---|
| 1417 | |
---|
| 1418 | } /* end of cuddUniqueInterZdd */ |
---|
| 1419 | |
---|
| 1420 | |
---|
| 1421 | /**Function******************************************************************** |
---|
| 1422 | |
---|
| 1423 | Synopsis [Checks the unique table for the existence of a constant node.] |
---|
| 1424 | |
---|
| 1425 | Description [Checks the unique table for the existence of a constant node. |
---|
| 1426 | If it does not exist, it creates a new one. Does not |
---|
| 1427 | modify the reference count of whatever is returned. A newly created |
---|
| 1428 | internal node comes back with a reference count 0. Returns a |
---|
| 1429 | pointer to the new node.] |
---|
| 1430 | |
---|
| 1431 | SideEffects [None] |
---|
| 1432 | |
---|
| 1433 | ******************************************************************************/ |
---|
| 1434 | DdNode * |
---|
| 1435 | cuddUniqueConst( |
---|
| 1436 | DdManager * unique, |
---|
| 1437 | CUDD_VALUE_TYPE value) |
---|
| 1438 | { |
---|
| 1439 | int pos; |
---|
| 1440 | DdNodePtr *nodelist; |
---|
| 1441 | DdNode *looking; |
---|
| 1442 | hack split; |
---|
| 1443 | |
---|
| 1444 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1445 | unique->uniqueLookUps++; |
---|
| 1446 | #endif |
---|
| 1447 | |
---|
| 1448 | if (unique->constants.keys > unique->constants.maxKeys) { |
---|
| 1449 | if (unique->gcEnabled && ((unique->dead > unique->minDead) || |
---|
| 1450 | (10 * unique->constants.dead > 9 * unique->constants.keys))) { /* too many dead */ |
---|
| 1451 | (void) cuddGarbageCollect(unique,1); |
---|
| 1452 | } else { |
---|
| 1453 | cuddRehash(unique,CUDD_CONST_INDEX); |
---|
| 1454 | } |
---|
| 1455 | } |
---|
| 1456 | |
---|
| 1457 | cuddAdjust(value); /* for the case of crippled infinities */ |
---|
| 1458 | |
---|
| 1459 | if (ddAbs(value) < unique->epsilon) { |
---|
| 1460 | value = 0.0; |
---|
| 1461 | } |
---|
| 1462 | split.value = value; |
---|
| 1463 | |
---|
| 1464 | pos = ddHash(split.bits[0], split.bits[1], unique->constants.shift); |
---|
| 1465 | nodelist = unique->constants.nodelist; |
---|
| 1466 | looking = nodelist[pos]; |
---|
| 1467 | |
---|
| 1468 | /* Here we compare values both for equality and for difference less |
---|
| 1469 | * than epsilon. The first comparison is required when values are |
---|
| 1470 | * infinite, since Infinity - Infinity is NaN and NaN < X is 0 for |
---|
| 1471 | * every X. |
---|
| 1472 | */ |
---|
| 1473 | while (looking != NULL) { |
---|
| 1474 | if (looking->type.value == value || |
---|
| 1475 | ddEqualVal(looking->type.value,value,unique->epsilon)) { |
---|
| 1476 | if (looking->ref == 0) { |
---|
| 1477 | cuddReclaim(unique,looking); |
---|
| 1478 | } |
---|
| 1479 | return(looking); |
---|
| 1480 | } |
---|
| 1481 | looking = looking->next; |
---|
| 1482 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1483 | unique->uniqueLinks++; |
---|
| 1484 | #endif |
---|
| 1485 | } |
---|
| 1486 | |
---|
| 1487 | unique->keys++; |
---|
| 1488 | unique->constants.keys++; |
---|
| 1489 | |
---|
| 1490 | looking = cuddAllocNode(unique); |
---|
| 1491 | if (looking == NULL) return(NULL); |
---|
| 1492 | looking->index = CUDD_CONST_INDEX; |
---|
| 1493 | looking->type.value = value; |
---|
| 1494 | looking->next = nodelist[pos]; |
---|
| 1495 | nodelist[pos] = looking; |
---|
| 1496 | |
---|
| 1497 | return(looking); |
---|
| 1498 | |
---|
| 1499 | } /* end of cuddUniqueConst */ |
---|
| 1500 | |
---|
| 1501 | |
---|
| 1502 | /**Function******************************************************************** |
---|
| 1503 | |
---|
| 1504 | Synopsis [Rehashes a unique subtable.] |
---|
| 1505 | |
---|
| 1506 | Description [Doubles the size of a unique subtable and rehashes its |
---|
| 1507 | contents.] |
---|
| 1508 | |
---|
| 1509 | SideEffects [None] |
---|
| 1510 | |
---|
| 1511 | SeeAlso [] |
---|
| 1512 | |
---|
| 1513 | ******************************************************************************/ |
---|
| 1514 | void |
---|
| 1515 | cuddRehash( |
---|
| 1516 | DdManager * unique, |
---|
| 1517 | int i) |
---|
| 1518 | { |
---|
| 1519 | unsigned int slots, oldslots; |
---|
| 1520 | int shift, oldshift; |
---|
| 1521 | int j, pos; |
---|
| 1522 | DdNodePtr *nodelist, *oldnodelist; |
---|
| 1523 | DdNode *node, *next; |
---|
| 1524 | DdNode *sentinel = &(unique->sentinel); |
---|
| 1525 | hack split; |
---|
| 1526 | extern DD_OOMFP MMoutOfMemory; |
---|
| 1527 | DD_OOMFP saveHandler; |
---|
| 1528 | |
---|
| 1529 | if (unique->gcFrac == DD_GC_FRAC_HI && unique->slots > unique->looseUpTo) { |
---|
| 1530 | unique->gcFrac = DD_GC_FRAC_LO; |
---|
| 1531 | unique->minDead = (unsigned) (DD_GC_FRAC_LO * (double) unique->slots); |
---|
| 1532 | #ifdef DD_VERBOSE |
---|
| 1533 | (void) fprintf(unique->err,"GC fraction = %.2f\t", DD_GC_FRAC_LO); |
---|
| 1534 | (void) fprintf(unique->err,"minDead = %d\n", unique->minDead); |
---|
| 1535 | #endif |
---|
| 1536 | } |
---|
| 1537 | |
---|
| 1538 | if (unique->gcFrac != DD_GC_FRAC_MIN && unique->memused > unique->maxmem) { |
---|
| 1539 | unique->gcFrac = DD_GC_FRAC_MIN; |
---|
| 1540 | unique->minDead = (unsigned) (DD_GC_FRAC_MIN * (double) unique->slots); |
---|
| 1541 | #ifdef DD_VERBOSE |
---|
| 1542 | (void) fprintf(unique->err,"GC fraction = %.2f\t", DD_GC_FRAC_MIN); |
---|
| 1543 | (void) fprintf(unique->err,"minDead = %d\n", unique->minDead); |
---|
| 1544 | #endif |
---|
| 1545 | cuddShrinkDeathRow(unique); |
---|
| 1546 | if (cuddGarbageCollect(unique,1) > 0) return; |
---|
| 1547 | } |
---|
| 1548 | |
---|
| 1549 | if (i != CUDD_CONST_INDEX) { |
---|
| 1550 | oldslots = unique->subtables[i].slots; |
---|
| 1551 | oldshift = unique->subtables[i].shift; |
---|
| 1552 | oldnodelist = unique->subtables[i].nodelist; |
---|
| 1553 | |
---|
| 1554 | /* Compute the new size of the subtable. */ |
---|
| 1555 | slots = oldslots << 1; |
---|
| 1556 | shift = oldshift - 1; |
---|
| 1557 | |
---|
| 1558 | saveHandler = MMoutOfMemory; |
---|
| 1559 | MMoutOfMemory = Cudd_OutOfMem; |
---|
| 1560 | nodelist = ALLOC(DdNodePtr, slots); |
---|
| 1561 | MMoutOfMemory = saveHandler; |
---|
| 1562 | if (nodelist == NULL) { |
---|
| 1563 | (void) fprintf(unique->err, |
---|
| 1564 | "Unable to resize subtable %d for lack of memory\n", |
---|
| 1565 | i); |
---|
| 1566 | /* Prevent frequent resizing attempts. */ |
---|
| 1567 | (void) cuddGarbageCollect(unique,1); |
---|
| 1568 | if (unique->stash != NULL) { |
---|
| 1569 | FREE(unique->stash); |
---|
| 1570 | unique->stash = NULL; |
---|
| 1571 | /* Inhibit resizing of tables. */ |
---|
| 1572 | cuddSlowTableGrowth(unique); |
---|
| 1573 | } |
---|
| 1574 | return; |
---|
| 1575 | } |
---|
| 1576 | unique->subtables[i].nodelist = nodelist; |
---|
| 1577 | unique->subtables[i].slots = slots; |
---|
| 1578 | unique->subtables[i].shift = shift; |
---|
| 1579 | unique->subtables[i].maxKeys = slots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 1580 | |
---|
| 1581 | /* Move the nodes from the old table to the new table. |
---|
| 1582 | ** This code depends on the type of hash function. |
---|
| 1583 | ** It assumes that the effect of doubling the size of the table |
---|
| 1584 | ** is to retain one more bit of the 32-bit hash value. |
---|
| 1585 | ** The additional bit is the LSB. */ |
---|
| 1586 | for (j = 0; (unsigned) j < oldslots; j++) { |
---|
| 1587 | DdNodePtr *evenP, *oddP; |
---|
| 1588 | node = oldnodelist[j]; |
---|
| 1589 | evenP = &(nodelist[j<<1]); |
---|
| 1590 | oddP = &(nodelist[(j<<1)+1]); |
---|
| 1591 | while (node != sentinel) { |
---|
| 1592 | next = node->next; |
---|
| 1593 | pos = ddHash(cuddT(node), cuddE(node), shift); |
---|
| 1594 | if (pos & 1) { |
---|
| 1595 | *oddP = node; |
---|
| 1596 | oddP = &(node->next); |
---|
| 1597 | } else { |
---|
| 1598 | *evenP = node; |
---|
| 1599 | evenP = &(node->next); |
---|
| 1600 | } |
---|
| 1601 | node = next; |
---|
| 1602 | } |
---|
| 1603 | *evenP = *oddP = sentinel; |
---|
| 1604 | } |
---|
| 1605 | FREE(oldnodelist); |
---|
| 1606 | |
---|
| 1607 | #ifdef DD_VERBOSE |
---|
| 1608 | (void) fprintf(unique->err, |
---|
| 1609 | "rehashing layer %d: keys %d dead %d new size %d\n", |
---|
| 1610 | i, unique->subtables[i].keys, |
---|
| 1611 | unique->subtables[i].dead, slots); |
---|
| 1612 | #endif |
---|
| 1613 | } else { |
---|
| 1614 | oldslots = unique->constants.slots; |
---|
| 1615 | oldshift = unique->constants.shift; |
---|
| 1616 | oldnodelist = unique->constants.nodelist; |
---|
| 1617 | |
---|
| 1618 | /* The constant subtable is never subjected to reordering. |
---|
| 1619 | ** Therefore, when it is resized, it is because it has just |
---|
| 1620 | ** reached the maximum load. We can safely just double the size, |
---|
| 1621 | ** with no need for the loop we use for the other tables. |
---|
| 1622 | */ |
---|
| 1623 | slots = oldslots << 1; |
---|
| 1624 | shift = oldshift - 1; |
---|
| 1625 | saveHandler = MMoutOfMemory; |
---|
| 1626 | MMoutOfMemory = Cudd_OutOfMem; |
---|
| 1627 | nodelist = ALLOC(DdNodePtr, slots); |
---|
| 1628 | MMoutOfMemory = saveHandler; |
---|
| 1629 | if (nodelist == NULL) { |
---|
| 1630 | (void) fprintf(unique->err, |
---|
| 1631 | "Unable to resize constant subtable for lack of memory\n"); |
---|
| 1632 | (void) cuddGarbageCollect(unique,1); |
---|
| 1633 | for (j = 0; j < unique->size; j++) { |
---|
| 1634 | unique->subtables[j].maxKeys <<= 1; |
---|
| 1635 | } |
---|
| 1636 | unique->constants.maxKeys <<= 1; |
---|
| 1637 | return; |
---|
| 1638 | } |
---|
| 1639 | unique->constants.slots = slots; |
---|
| 1640 | unique->constants.shift = shift; |
---|
| 1641 | unique->constants.maxKeys = slots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 1642 | unique->constants.nodelist = nodelist; |
---|
| 1643 | for (j = 0; (unsigned) j < slots; j++) { |
---|
| 1644 | nodelist[j] = NULL; |
---|
| 1645 | } |
---|
| 1646 | for (j = 0; (unsigned) j < oldslots; j++) { |
---|
| 1647 | node = oldnodelist[j]; |
---|
| 1648 | while (node != NULL) { |
---|
| 1649 | next = node->next; |
---|
| 1650 | split.value = cuddV(node); |
---|
| 1651 | pos = ddHash(split.bits[0], split.bits[1], shift); |
---|
| 1652 | node->next = nodelist[pos]; |
---|
| 1653 | nodelist[pos] = node; |
---|
| 1654 | node = next; |
---|
| 1655 | } |
---|
| 1656 | } |
---|
| 1657 | FREE(oldnodelist); |
---|
| 1658 | |
---|
| 1659 | #ifdef DD_VERBOSE |
---|
| 1660 | (void) fprintf(unique->err, |
---|
| 1661 | "rehashing constants: keys %d dead %d new size %d\n", |
---|
| 1662 | unique->constants.keys,unique->constants.dead,slots); |
---|
| 1663 | #endif |
---|
| 1664 | } |
---|
| 1665 | |
---|
| 1666 | /* Update global data */ |
---|
| 1667 | |
---|
| 1668 | unique->memused += (slots - oldslots) * sizeof(DdNodePtr); |
---|
| 1669 | unique->slots += (slots - oldslots); |
---|
| 1670 | ddFixLimits(unique); |
---|
| 1671 | |
---|
| 1672 | } /* end of cuddRehash */ |
---|
| 1673 | |
---|
| 1674 | |
---|
| 1675 | /**Function******************************************************************** |
---|
| 1676 | |
---|
| 1677 | Synopsis [Shrinks a subtable.] |
---|
| 1678 | |
---|
| 1679 | Description [Shrinks a subtable.] |
---|
| 1680 | |
---|
| 1681 | SideEffects [None] |
---|
| 1682 | |
---|
| 1683 | SeeAlso [cuddRehash] |
---|
| 1684 | |
---|
| 1685 | ******************************************************************************/ |
---|
| 1686 | void |
---|
| 1687 | cuddShrinkSubtable( |
---|
| 1688 | DdManager *unique, |
---|
| 1689 | int i) |
---|
| 1690 | { |
---|
| 1691 | int j; |
---|
| 1692 | int shift, posn; |
---|
| 1693 | DdNodePtr *nodelist, *oldnodelist; |
---|
| 1694 | DdNode *node, *next; |
---|
| 1695 | DdNode *sentinel = &(unique->sentinel); |
---|
| 1696 | unsigned int slots, oldslots; |
---|
| 1697 | extern DD_OOMFP MMoutOfMemory; |
---|
| 1698 | DD_OOMFP saveHandler; |
---|
| 1699 | |
---|
| 1700 | oldnodelist = unique->subtables[i].nodelist; |
---|
| 1701 | oldslots = unique->subtables[i].slots; |
---|
| 1702 | slots = oldslots >> 1; |
---|
| 1703 | saveHandler = MMoutOfMemory; |
---|
| 1704 | MMoutOfMemory = Cudd_OutOfMem; |
---|
| 1705 | nodelist = ALLOC(DdNodePtr, slots); |
---|
| 1706 | MMoutOfMemory = saveHandler; |
---|
| 1707 | if (nodelist == NULL) { |
---|
| 1708 | return; |
---|
| 1709 | } |
---|
| 1710 | unique->subtables[i].nodelist = nodelist; |
---|
| 1711 | unique->subtables[i].slots = slots; |
---|
| 1712 | unique->subtables[i].shift++; |
---|
| 1713 | unique->subtables[i].maxKeys = slots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 1714 | #ifdef DD_VERBOSE |
---|
| 1715 | (void) fprintf(unique->err, |
---|
| 1716 | "shrunk layer %d (%d keys) from %d to %d slots\n", |
---|
| 1717 | i, unique->subtables[i].keys, oldslots, slots); |
---|
| 1718 | #endif |
---|
| 1719 | |
---|
| 1720 | for (j = 0; (unsigned) j < slots; j++) { |
---|
| 1721 | nodelist[j] = sentinel; |
---|
| 1722 | } |
---|
| 1723 | shift = unique->subtables[i].shift; |
---|
| 1724 | for (j = 0; (unsigned) j < oldslots; j++) { |
---|
| 1725 | node = oldnodelist[j]; |
---|
| 1726 | while (node != sentinel) { |
---|
| 1727 | DdNode *looking, *T, *E; |
---|
| 1728 | DdNodePtr *previousP; |
---|
| 1729 | next = node->next; |
---|
| 1730 | posn = ddHash(cuddT(node), cuddE(node), shift); |
---|
| 1731 | previousP = &(nodelist[posn]); |
---|
| 1732 | looking = *previousP; |
---|
| 1733 | T = cuddT(node); |
---|
| 1734 | E = cuddE(node); |
---|
| 1735 | while (T < cuddT(looking)) { |
---|
| 1736 | previousP = &(looking->next); |
---|
| 1737 | looking = *previousP; |
---|
| 1738 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1739 | unique->uniqueLinks++; |
---|
| 1740 | #endif |
---|
| 1741 | } |
---|
| 1742 | while (T == cuddT(looking) && E < cuddE(looking)) { |
---|
| 1743 | previousP = &(looking->next); |
---|
| 1744 | looking = *previousP; |
---|
| 1745 | #ifdef DD_UNIQUE_PROFILE |
---|
| 1746 | unique->uniqueLinks++; |
---|
| 1747 | #endif |
---|
| 1748 | } |
---|
| 1749 | node->next = *previousP; |
---|
| 1750 | *previousP = node; |
---|
| 1751 | node = next; |
---|
| 1752 | } |
---|
| 1753 | } |
---|
| 1754 | FREE(oldnodelist); |
---|
| 1755 | |
---|
| 1756 | unique->memused += ((long) slots - (long) oldslots) * sizeof(DdNode *); |
---|
| 1757 | unique->slots += slots - oldslots; |
---|
| 1758 | unique->minDead = (unsigned) (unique->gcFrac * (double) unique->slots); |
---|
| 1759 | unique->cacheSlack = (int) |
---|
| 1760 | ddMin(unique->maxCacheHard,DD_MAX_CACHE_TO_SLOTS_RATIO * unique->slots) |
---|
| 1761 | - 2 * (int) unique->cacheSlots; |
---|
| 1762 | |
---|
| 1763 | } /* end of cuddShrinkSubtable */ |
---|
| 1764 | |
---|
| 1765 | |
---|
| 1766 | /**Function******************************************************************** |
---|
| 1767 | |
---|
| 1768 | Synopsis [Inserts n new subtables in a unique table at level.] |
---|
| 1769 | |
---|
| 1770 | Description [Inserts n new subtables in a unique table at level. |
---|
| 1771 | The number n should be positive, and level should be an existing level. |
---|
| 1772 | Returns 1 if successful; 0 otherwise.] |
---|
| 1773 | |
---|
| 1774 | SideEffects [None] |
---|
| 1775 | |
---|
| 1776 | SeeAlso [cuddDestroySubtables] |
---|
| 1777 | |
---|
| 1778 | ******************************************************************************/ |
---|
| 1779 | int |
---|
| 1780 | cuddInsertSubtables( |
---|
| 1781 | DdManager * unique, |
---|
| 1782 | int n, |
---|
| 1783 | int level) |
---|
| 1784 | { |
---|
| 1785 | DdSubtable *newsubtables; |
---|
| 1786 | DdNodePtr *newnodelist; |
---|
| 1787 | DdNodePtr *newvars; |
---|
| 1788 | DdNode *sentinel = &(unique->sentinel); |
---|
| 1789 | int oldsize,newsize; |
---|
| 1790 | int i,j,index,reorderSave; |
---|
| 1791 | unsigned int numSlots = unique->initSlots; |
---|
| 1792 | int *newperm, *newinvperm, *newmap; |
---|
| 1793 | DdNode *one, *zero; |
---|
| 1794 | |
---|
| 1795 | #ifdef DD_DEBUG |
---|
| 1796 | assert(n > 0 && level < unique->size); |
---|
| 1797 | #endif |
---|
| 1798 | |
---|
| 1799 | oldsize = unique->size; |
---|
| 1800 | /* Easy case: there is still room in the current table. */ |
---|
| 1801 | if (oldsize + n <= unique->maxSize) { |
---|
| 1802 | /* Shift the tables at and below level. */ |
---|
| 1803 | for (i = oldsize - 1; i >= level; i--) { |
---|
| 1804 | unique->subtables[i+n].slots = unique->subtables[i].slots; |
---|
| 1805 | unique->subtables[i+n].shift = unique->subtables[i].shift; |
---|
| 1806 | unique->subtables[i+n].keys = unique->subtables[i].keys; |
---|
| 1807 | unique->subtables[i+n].maxKeys = unique->subtables[i].maxKeys; |
---|
| 1808 | unique->subtables[i+n].dead = unique->subtables[i].dead; |
---|
| 1809 | unique->subtables[i+n].nodelist = unique->subtables[i].nodelist; |
---|
| 1810 | unique->subtables[i+n].bindVar = unique->subtables[i].bindVar; |
---|
| 1811 | unique->subtables[i+n].varType = unique->subtables[i].varType; |
---|
| 1812 | unique->subtables[i+n].pairIndex = unique->subtables[i].pairIndex; |
---|
| 1813 | unique->subtables[i+n].varHandled = unique->subtables[i].varHandled; |
---|
| 1814 | unique->subtables[i+n].varToBeGrouped = |
---|
| 1815 | unique->subtables[i].varToBeGrouped; |
---|
| 1816 | |
---|
| 1817 | index = unique->invperm[i]; |
---|
| 1818 | unique->invperm[i+n] = index; |
---|
| 1819 | unique->perm[index] += n; |
---|
| 1820 | } |
---|
| 1821 | /* Create new subtables. */ |
---|
| 1822 | for (i = 0; i < n; i++) { |
---|
| 1823 | unique->subtables[level+i].slots = numSlots; |
---|
| 1824 | unique->subtables[level+i].shift = sizeof(int) * 8 - |
---|
| 1825 | cuddComputeFloorLog2(numSlots); |
---|
| 1826 | unique->subtables[level+i].keys = 0; |
---|
| 1827 | unique->subtables[level+i].maxKeys = numSlots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 1828 | unique->subtables[level+i].dead = 0; |
---|
| 1829 | unique->subtables[level+i].bindVar = 0; |
---|
| 1830 | unique->subtables[level+i].varType = CUDD_VAR_PRIMARY_INPUT; |
---|
| 1831 | unique->subtables[level+i].pairIndex = 0; |
---|
| 1832 | unique->subtables[level+i].varHandled = 0; |
---|
| 1833 | unique->subtables[level+i].varToBeGrouped = CUDD_LAZY_NONE; |
---|
| 1834 | |
---|
| 1835 | unique->perm[oldsize+i] = level + i; |
---|
| 1836 | unique->invperm[level+i] = oldsize + i; |
---|
| 1837 | newnodelist = unique->subtables[level+i].nodelist = |
---|
| 1838 | ALLOC(DdNodePtr, numSlots); |
---|
| 1839 | if (newnodelist == NULL) { |
---|
| 1840 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 1841 | return(0); |
---|
| 1842 | } |
---|
| 1843 | for (j = 0; (unsigned) j < numSlots; j++) { |
---|
| 1844 | newnodelist[j] = sentinel; |
---|
| 1845 | } |
---|
| 1846 | } |
---|
| 1847 | if (unique->map != NULL) { |
---|
| 1848 | for (i = 0; i < n; i++) { |
---|
| 1849 | unique->map[oldsize+i] = oldsize + i; |
---|
| 1850 | } |
---|
| 1851 | } |
---|
| 1852 | } else { |
---|
| 1853 | /* The current table is too small: we need to allocate a new, |
---|
| 1854 | ** larger one; move all old subtables, and initialize the new |
---|
| 1855 | ** subtables. |
---|
| 1856 | */ |
---|
| 1857 | newsize = oldsize + n + DD_DEFAULT_RESIZE; |
---|
| 1858 | #ifdef DD_VERBOSE |
---|
| 1859 | (void) fprintf(unique->err, |
---|
| 1860 | "Increasing the table size from %d to %d\n", |
---|
| 1861 | unique->maxSize, newsize); |
---|
| 1862 | #endif |
---|
| 1863 | /* Allocate memory for new arrays (except nodelists). */ |
---|
| 1864 | newsubtables = ALLOC(DdSubtable,newsize); |
---|
| 1865 | if (newsubtables == NULL) { |
---|
| 1866 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 1867 | return(0); |
---|
| 1868 | } |
---|
| 1869 | newvars = ALLOC(DdNodePtr,newsize); |
---|
| 1870 | if (newvars == NULL) { |
---|
| 1871 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 1872 | FREE(newsubtables); |
---|
| 1873 | return(0); |
---|
| 1874 | } |
---|
| 1875 | newperm = ALLOC(int,newsize); |
---|
| 1876 | if (newperm == NULL) { |
---|
| 1877 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 1878 | FREE(newsubtables); |
---|
| 1879 | FREE(newvars); |
---|
| 1880 | return(0); |
---|
| 1881 | } |
---|
| 1882 | newinvperm = ALLOC(int,newsize); |
---|
| 1883 | if (newinvperm == NULL) { |
---|
| 1884 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 1885 | FREE(newsubtables); |
---|
| 1886 | FREE(newvars); |
---|
| 1887 | FREE(newperm); |
---|
| 1888 | return(0); |
---|
| 1889 | } |
---|
| 1890 | if (unique->map != NULL) { |
---|
| 1891 | newmap = ALLOC(int,newsize); |
---|
| 1892 | if (newmap == NULL) { |
---|
| 1893 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 1894 | FREE(newsubtables); |
---|
| 1895 | FREE(newvars); |
---|
| 1896 | FREE(newperm); |
---|
| 1897 | FREE(newinvperm); |
---|
| 1898 | return(0); |
---|
| 1899 | } |
---|
| 1900 | unique->memused += (newsize - unique->maxSize) * sizeof(int); |
---|
| 1901 | } |
---|
| 1902 | unique->memused += (newsize - unique->maxSize) * ((numSlots+1) * |
---|
| 1903 | sizeof(DdNode *) + 2 * sizeof(int) + sizeof(DdSubtable)); |
---|
| 1904 | /* Copy levels before insertion points from old tables. */ |
---|
| 1905 | for (i = 0; i < level; i++) { |
---|
| 1906 | newsubtables[i].slots = unique->subtables[i].slots; |
---|
| 1907 | newsubtables[i].shift = unique->subtables[i].shift; |
---|
| 1908 | newsubtables[i].keys = unique->subtables[i].keys; |
---|
| 1909 | newsubtables[i].maxKeys = unique->subtables[i].maxKeys; |
---|
| 1910 | newsubtables[i].dead = unique->subtables[i].dead; |
---|
| 1911 | newsubtables[i].nodelist = unique->subtables[i].nodelist; |
---|
| 1912 | newsubtables[i].bindVar = unique->subtables[i].bindVar; |
---|
| 1913 | newsubtables[i].varType = unique->subtables[i].varType; |
---|
| 1914 | newsubtables[i].pairIndex = unique->subtables[i].pairIndex; |
---|
| 1915 | newsubtables[i].varHandled = unique->subtables[i].varHandled; |
---|
| 1916 | newsubtables[i].varToBeGrouped = unique->subtables[i].varToBeGrouped; |
---|
| 1917 | |
---|
| 1918 | newvars[i] = unique->vars[i]; |
---|
| 1919 | newperm[i] = unique->perm[i]; |
---|
| 1920 | newinvperm[i] = unique->invperm[i]; |
---|
| 1921 | } |
---|
| 1922 | /* Finish initializing permutation for new table to old one. */ |
---|
| 1923 | for (i = level; i < oldsize; i++) { |
---|
| 1924 | newperm[i] = unique->perm[i]; |
---|
| 1925 | } |
---|
| 1926 | /* Initialize new levels. */ |
---|
| 1927 | for (i = level; i < level + n; i++) { |
---|
| 1928 | newsubtables[i].slots = numSlots; |
---|
| 1929 | newsubtables[i].shift = sizeof(int) * 8 - |
---|
| 1930 | cuddComputeFloorLog2(numSlots); |
---|
| 1931 | newsubtables[i].keys = 0; |
---|
| 1932 | newsubtables[i].maxKeys = numSlots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 1933 | newsubtables[i].dead = 0; |
---|
| 1934 | newsubtables[i].bindVar = 0; |
---|
| 1935 | newsubtables[i].varType = CUDD_VAR_PRIMARY_INPUT; |
---|
| 1936 | newsubtables[i].pairIndex = 0; |
---|
| 1937 | newsubtables[i].varHandled = 0; |
---|
| 1938 | newsubtables[i].varToBeGrouped = CUDD_LAZY_NONE; |
---|
| 1939 | |
---|
| 1940 | newperm[oldsize + i - level] = i; |
---|
| 1941 | newinvperm[i] = oldsize + i - level; |
---|
| 1942 | newnodelist = newsubtables[i].nodelist = ALLOC(DdNodePtr, numSlots); |
---|
| 1943 | if (newnodelist == NULL) { |
---|
| 1944 | /* We are going to leak some memory. We should clean up. */ |
---|
| 1945 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 1946 | return(0); |
---|
| 1947 | } |
---|
| 1948 | for (j = 0; (unsigned) j < numSlots; j++) { |
---|
| 1949 | newnodelist[j] = sentinel; |
---|
| 1950 | } |
---|
| 1951 | } |
---|
| 1952 | /* Copy the old tables for levels past the insertion point. */ |
---|
| 1953 | for (i = level; i < oldsize; i++) { |
---|
| 1954 | newsubtables[i+n].slots = unique->subtables[i].slots; |
---|
| 1955 | newsubtables[i+n].shift = unique->subtables[i].shift; |
---|
| 1956 | newsubtables[i+n].keys = unique->subtables[i].keys; |
---|
| 1957 | newsubtables[i+n].maxKeys = unique->subtables[i].maxKeys; |
---|
| 1958 | newsubtables[i+n].dead = unique->subtables[i].dead; |
---|
| 1959 | newsubtables[i+n].nodelist = unique->subtables[i].nodelist; |
---|
| 1960 | newsubtables[i+n].bindVar = unique->subtables[i].bindVar; |
---|
| 1961 | newsubtables[i+n].varType = unique->subtables[i].varType; |
---|
| 1962 | newsubtables[i+n].pairIndex = unique->subtables[i].pairIndex; |
---|
| 1963 | newsubtables[i+n].varHandled = unique->subtables[i].varHandled; |
---|
| 1964 | newsubtables[i+n].varToBeGrouped = |
---|
| 1965 | unique->subtables[i].varToBeGrouped; |
---|
| 1966 | |
---|
| 1967 | newvars[i] = unique->vars[i]; |
---|
| 1968 | index = unique->invperm[i]; |
---|
| 1969 | newinvperm[i+n] = index; |
---|
| 1970 | newperm[index] += n; |
---|
| 1971 | } |
---|
| 1972 | /* Update the map. */ |
---|
| 1973 | if (unique->map != NULL) { |
---|
| 1974 | for (i = 0; i < oldsize; i++) { |
---|
| 1975 | newmap[i] = unique->map[i]; |
---|
| 1976 | } |
---|
| 1977 | for (i = oldsize; i < oldsize + n; i++) { |
---|
| 1978 | newmap[i] = i; |
---|
| 1979 | } |
---|
| 1980 | FREE(unique->map); |
---|
| 1981 | unique->map = newmap; |
---|
| 1982 | } |
---|
| 1983 | /* Install the new tables and free the old ones. */ |
---|
| 1984 | FREE(unique->subtables); |
---|
| 1985 | unique->subtables = newsubtables; |
---|
| 1986 | unique->maxSize = newsize; |
---|
| 1987 | FREE(unique->vars); |
---|
| 1988 | unique->vars = newvars; |
---|
| 1989 | FREE(unique->perm); |
---|
| 1990 | unique->perm = newperm; |
---|
| 1991 | FREE(unique->invperm); |
---|
| 1992 | unique->invperm = newinvperm; |
---|
| 1993 | /* Update the stack for iterative procedures. */ |
---|
| 1994 | if (newsize > unique->maxSizeZ) { |
---|
| 1995 | FREE(unique->stack); |
---|
| 1996 | unique->stack = ALLOC(DdNodePtr,newsize + 1); |
---|
| 1997 | if (unique->stack == NULL) { |
---|
| 1998 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 1999 | return(0); |
---|
| 2000 | } |
---|
| 2001 | unique->stack[0] = NULL; /* to suppress harmless UMR */ |
---|
| 2002 | unique->memused += |
---|
| 2003 | (newsize - ddMax(unique->maxSize,unique->maxSizeZ)) |
---|
| 2004 | * sizeof(DdNode *); |
---|
| 2005 | } |
---|
| 2006 | } |
---|
| 2007 | /* Update manager parameters to account for the new subtables. */ |
---|
| 2008 | unique->slots += n * numSlots; |
---|
| 2009 | ddFixLimits(unique); |
---|
| 2010 | unique->size += n; |
---|
| 2011 | |
---|
| 2012 | /* Now that the table is in a coherent state, create the new |
---|
| 2013 | ** projection functions. We need to temporarily disable reordering, |
---|
| 2014 | ** because we cannot reorder without projection functions in place. |
---|
| 2015 | **/ |
---|
| 2016 | one = unique->one; |
---|
| 2017 | zero = Cudd_Not(one); |
---|
| 2018 | |
---|
| 2019 | reorderSave = unique->autoDyn; |
---|
| 2020 | unique->autoDyn = 0; |
---|
| 2021 | for (i = oldsize; i < oldsize + n; i++) { |
---|
| 2022 | unique->vars[i] = cuddUniqueInter(unique,i,one,zero); |
---|
| 2023 | if (unique->vars[i] == NULL) { |
---|
| 2024 | unique->autoDyn = reorderSave; |
---|
| 2025 | /* Shift everything back so table remains coherent. */ |
---|
| 2026 | for (j = oldsize; j < i; j++) { |
---|
| 2027 | Cudd_IterDerefBdd(unique,unique->vars[j]); |
---|
| 2028 | cuddDeallocNode(unique,unique->vars[j]); |
---|
| 2029 | unique->vars[j] = NULL; |
---|
| 2030 | } |
---|
| 2031 | for (j = level; j < oldsize; j++) { |
---|
| 2032 | unique->subtables[j].slots = unique->subtables[j+n].slots; |
---|
| 2033 | unique->subtables[j].slots = unique->subtables[j+n].slots; |
---|
| 2034 | unique->subtables[j].shift = unique->subtables[j+n].shift; |
---|
| 2035 | unique->subtables[j].keys = unique->subtables[j+n].keys; |
---|
| 2036 | unique->subtables[j].maxKeys = |
---|
| 2037 | unique->subtables[j+n].maxKeys; |
---|
| 2038 | unique->subtables[j].dead = unique->subtables[j+n].dead; |
---|
| 2039 | FREE(unique->subtables[j].nodelist); |
---|
| 2040 | unique->subtables[j].nodelist = |
---|
| 2041 | unique->subtables[j+n].nodelist; |
---|
| 2042 | unique->subtables[j+n].nodelist = NULL; |
---|
| 2043 | unique->subtables[j].bindVar = |
---|
| 2044 | unique->subtables[j+n].bindVar; |
---|
| 2045 | unique->subtables[j].varType = |
---|
| 2046 | unique->subtables[j+n].varType; |
---|
| 2047 | unique->subtables[j].pairIndex = |
---|
| 2048 | unique->subtables[j+n].pairIndex; |
---|
| 2049 | unique->subtables[j].varHandled = |
---|
| 2050 | unique->subtables[j+n].varHandled; |
---|
| 2051 | unique->subtables[j].varToBeGrouped = |
---|
| 2052 | unique->subtables[j+n].varToBeGrouped; |
---|
| 2053 | index = unique->invperm[j+n]; |
---|
| 2054 | unique->invperm[j] = index; |
---|
| 2055 | unique->perm[index] -= n; |
---|
| 2056 | } |
---|
| 2057 | unique->size = oldsize; |
---|
| 2058 | unique->slots -= n * numSlots; |
---|
| 2059 | ddFixLimits(unique); |
---|
| 2060 | (void) Cudd_DebugCheck(unique); |
---|
| 2061 | return(0); |
---|
| 2062 | } |
---|
| 2063 | cuddRef(unique->vars[i]); |
---|
| 2064 | } |
---|
| 2065 | if (unique->tree != NULL) { |
---|
| 2066 | unique->tree->size += n; |
---|
| 2067 | unique->tree->index = unique->invperm[0]; |
---|
| 2068 | ddPatchTree(unique,unique->tree); |
---|
| 2069 | } |
---|
| 2070 | unique->autoDyn = reorderSave; |
---|
| 2071 | |
---|
| 2072 | return(1); |
---|
| 2073 | |
---|
| 2074 | } /* end of cuddInsertSubtables */ |
---|
| 2075 | |
---|
| 2076 | |
---|
| 2077 | /**Function******************************************************************** |
---|
| 2078 | |
---|
| 2079 | Synopsis [Destroys the n most recently created subtables in a unique table.] |
---|
| 2080 | |
---|
| 2081 | Description [Destroys the n most recently created subtables in a unique |
---|
| 2082 | table. n should be positive. The subtables should not contain any live |
---|
| 2083 | nodes, except the (isolated) projection function. The projection |
---|
| 2084 | functions are freed. Returns 1 if successful; 0 otherwise.] |
---|
| 2085 | |
---|
| 2086 | SideEffects [The variable map used for fast variable substitution is |
---|
| 2087 | destroyed if it exists. In this case the cache is also cleared.] |
---|
| 2088 | |
---|
| 2089 | SeeAlso [cuddInsertSubtables Cudd_SetVarMap] |
---|
| 2090 | |
---|
| 2091 | ******************************************************************************/ |
---|
| 2092 | int |
---|
| 2093 | cuddDestroySubtables( |
---|
| 2094 | DdManager * unique, |
---|
| 2095 | int n) |
---|
| 2096 | { |
---|
| 2097 | DdSubtable *subtables; |
---|
| 2098 | DdNodePtr *nodelist; |
---|
| 2099 | DdNodePtr *vars; |
---|
| 2100 | int firstIndex, lastIndex; |
---|
| 2101 | int index, level, newlevel; |
---|
| 2102 | int lowestLevel; |
---|
| 2103 | int shift; |
---|
| 2104 | int found; |
---|
| 2105 | |
---|
| 2106 | /* Sanity check and set up. */ |
---|
| 2107 | if (n <= 0) return(0); |
---|
| 2108 | if (n > unique->size) n = unique->size; |
---|
| 2109 | |
---|
| 2110 | subtables = unique->subtables; |
---|
| 2111 | vars = unique->vars; |
---|
| 2112 | firstIndex = unique->size - n; |
---|
| 2113 | lastIndex = unique->size; |
---|
| 2114 | |
---|
| 2115 | /* Check for nodes labeled by the variables being destroyed |
---|
| 2116 | ** that may still be in use. It is allowed to destroy a variable |
---|
| 2117 | ** only if there are no such nodes. Also, find the lowest level |
---|
| 2118 | ** among the variables being destroyed. This will make further |
---|
| 2119 | ** processing more efficient. |
---|
| 2120 | */ |
---|
| 2121 | lowestLevel = unique->size; |
---|
| 2122 | for (index = firstIndex; index < lastIndex; index++) { |
---|
| 2123 | level = unique->perm[index]; |
---|
| 2124 | if (level < lowestLevel) lowestLevel = level; |
---|
| 2125 | nodelist = subtables[level].nodelist; |
---|
| 2126 | if (subtables[level].keys - subtables[level].dead != 1) return(0); |
---|
| 2127 | /* The projection function should be isolated. If the ref count |
---|
| 2128 | ** is 1, everything is OK. If the ref count is saturated, then |
---|
| 2129 | ** we need to make sure that there are no nodes pointing to it. |
---|
| 2130 | ** As for the external references, we assume the application is |
---|
| 2131 | ** responsible for them. |
---|
| 2132 | */ |
---|
| 2133 | if (vars[index]->ref != 1) { |
---|
| 2134 | if (vars[index]->ref != DD_MAXREF) return(0); |
---|
| 2135 | found = cuddFindParent(unique,vars[index]); |
---|
| 2136 | if (found) { |
---|
| 2137 | return(0); |
---|
| 2138 | } else { |
---|
| 2139 | vars[index]->ref = 1; |
---|
| 2140 | } |
---|
| 2141 | } |
---|
| 2142 | Cudd_RecursiveDeref(unique,vars[index]); |
---|
| 2143 | } |
---|
| 2144 | |
---|
| 2145 | /* Collect garbage, because we cannot afford having dead nodes pointing |
---|
| 2146 | ** to the dead nodes in the subtables being destroyed. |
---|
| 2147 | */ |
---|
| 2148 | (void) cuddGarbageCollect(unique,1); |
---|
| 2149 | |
---|
| 2150 | /* Here we know we can destroy our subtables. */ |
---|
| 2151 | for (index = firstIndex; index < lastIndex; index++) { |
---|
| 2152 | level = unique->perm[index]; |
---|
| 2153 | nodelist = subtables[level].nodelist; |
---|
| 2154 | #ifdef DD_DEBUG |
---|
| 2155 | assert(subtables[level].keys == 0); |
---|
| 2156 | #endif |
---|
| 2157 | FREE(nodelist); |
---|
| 2158 | unique->memused -= sizeof(DdNodePtr) * subtables[level].slots; |
---|
| 2159 | unique->slots -= subtables[level].slots; |
---|
| 2160 | unique->dead -= subtables[level].dead; |
---|
| 2161 | } |
---|
| 2162 | |
---|
| 2163 | /* Here all subtables to be destroyed have their keys field == 0 and |
---|
| 2164 | ** their hash tables have been freed. |
---|
| 2165 | ** We now scan the subtables from level lowestLevel + 1 to level size - 1, |
---|
| 2166 | ** shifting the subtables as required. We keep a running count of |
---|
| 2167 | ** how many subtables have been moved, so that we know by how many |
---|
| 2168 | ** positions each subtable should be shifted. |
---|
| 2169 | */ |
---|
| 2170 | shift = 1; |
---|
| 2171 | for (level = lowestLevel + 1; level < unique->size; level++) { |
---|
| 2172 | if (subtables[level].keys == 0) { |
---|
| 2173 | shift++; |
---|
| 2174 | continue; |
---|
| 2175 | } |
---|
| 2176 | newlevel = level - shift; |
---|
| 2177 | subtables[newlevel].slots = subtables[level].slots; |
---|
| 2178 | subtables[newlevel].shift = subtables[level].shift; |
---|
| 2179 | subtables[newlevel].keys = subtables[level].keys; |
---|
| 2180 | subtables[newlevel].maxKeys = subtables[level].maxKeys; |
---|
| 2181 | subtables[newlevel].dead = subtables[level].dead; |
---|
| 2182 | subtables[newlevel].nodelist = subtables[level].nodelist; |
---|
| 2183 | index = unique->invperm[level]; |
---|
| 2184 | unique->perm[index] = newlevel; |
---|
| 2185 | unique->invperm[newlevel] = index; |
---|
| 2186 | subtables[newlevel].bindVar = subtables[level].bindVar; |
---|
| 2187 | subtables[newlevel].varType = subtables[level].varType; |
---|
| 2188 | subtables[newlevel].pairIndex = subtables[level].pairIndex; |
---|
| 2189 | subtables[newlevel].varHandled = subtables[level].varHandled; |
---|
| 2190 | subtables[newlevel].varToBeGrouped = subtables[level].varToBeGrouped; |
---|
| 2191 | } |
---|
| 2192 | /* Destroy the map. If a surviving variable is |
---|
| 2193 | ** mapped to a dying variable, and the map were used again, |
---|
| 2194 | ** an out-of-bounds access to unique->vars would result. */ |
---|
| 2195 | if (unique->map != NULL) { |
---|
| 2196 | cuddCacheFlush(unique); |
---|
| 2197 | FREE(unique->map); |
---|
| 2198 | unique->map = NULL; |
---|
| 2199 | } |
---|
| 2200 | |
---|
| 2201 | unique->minDead = (unsigned) (unique->gcFrac * (double) unique->slots); |
---|
| 2202 | unique->size -= n; |
---|
| 2203 | |
---|
| 2204 | return(1); |
---|
| 2205 | |
---|
| 2206 | } /* end of cuddDestroySubtables */ |
---|
| 2207 | |
---|
| 2208 | |
---|
| 2209 | /**Function******************************************************************** |
---|
| 2210 | |
---|
| 2211 | Synopsis [Increases the number of ZDD subtables in a unique table so |
---|
| 2212 | that it meets or exceeds index.] |
---|
| 2213 | |
---|
| 2214 | Description [Increases the number of ZDD subtables in a unique table so |
---|
| 2215 | that it meets or exceeds index. When new ZDD variables are created, it |
---|
| 2216 | is possible to preserve the functions unchanged, or it is possible to |
---|
| 2217 | preserve the covers unchanged, but not both. cuddResizeTableZdd preserves |
---|
| 2218 | the covers. Returns 1 if successful; 0 otherwise.] |
---|
| 2219 | |
---|
| 2220 | SideEffects [None] |
---|
| 2221 | |
---|
| 2222 | SeeAlso [ddResizeTable] |
---|
| 2223 | |
---|
| 2224 | ******************************************************************************/ |
---|
| 2225 | int |
---|
| 2226 | cuddResizeTableZdd( |
---|
| 2227 | DdManager * unique, |
---|
| 2228 | int index) |
---|
| 2229 | { |
---|
| 2230 | DdSubtable *newsubtables; |
---|
| 2231 | DdNodePtr *newnodelist; |
---|
| 2232 | int oldsize,newsize; |
---|
| 2233 | int i,j,reorderSave; |
---|
| 2234 | unsigned int numSlots = unique->initSlots; |
---|
| 2235 | int *newperm, *newinvperm; |
---|
| 2236 | |
---|
| 2237 | oldsize = unique->sizeZ; |
---|
| 2238 | /* Easy case: there is still room in the current table. */ |
---|
| 2239 | if (index < unique->maxSizeZ) { |
---|
| 2240 | for (i = oldsize; i <= index; i++) { |
---|
| 2241 | unique->subtableZ[i].slots = numSlots; |
---|
| 2242 | unique->subtableZ[i].shift = sizeof(int) * 8 - |
---|
| 2243 | cuddComputeFloorLog2(numSlots); |
---|
| 2244 | unique->subtableZ[i].keys = 0; |
---|
| 2245 | unique->subtableZ[i].maxKeys = numSlots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 2246 | unique->subtableZ[i].dead = 0; |
---|
| 2247 | unique->permZ[i] = i; |
---|
| 2248 | unique->invpermZ[i] = i; |
---|
| 2249 | newnodelist = unique->subtableZ[i].nodelist = |
---|
| 2250 | ALLOC(DdNodePtr, numSlots); |
---|
| 2251 | if (newnodelist == NULL) { |
---|
| 2252 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2253 | return(0); |
---|
| 2254 | } |
---|
| 2255 | for (j = 0; (unsigned) j < numSlots; j++) { |
---|
| 2256 | newnodelist[j] = NULL; |
---|
| 2257 | } |
---|
| 2258 | } |
---|
| 2259 | } else { |
---|
| 2260 | /* The current table is too small: we need to allocate a new, |
---|
| 2261 | ** larger one; move all old subtables, and initialize the new |
---|
| 2262 | ** subtables up to index included. |
---|
| 2263 | */ |
---|
| 2264 | newsize = index + DD_DEFAULT_RESIZE; |
---|
| 2265 | #ifdef DD_VERBOSE |
---|
| 2266 | (void) fprintf(unique->err, |
---|
| 2267 | "Increasing the ZDD table size from %d to %d\n", |
---|
| 2268 | unique->maxSizeZ, newsize); |
---|
| 2269 | #endif |
---|
| 2270 | newsubtables = ALLOC(DdSubtable,newsize); |
---|
| 2271 | if (newsubtables == NULL) { |
---|
| 2272 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2273 | return(0); |
---|
| 2274 | } |
---|
| 2275 | newperm = ALLOC(int,newsize); |
---|
| 2276 | if (newperm == NULL) { |
---|
| 2277 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2278 | return(0); |
---|
| 2279 | } |
---|
| 2280 | newinvperm = ALLOC(int,newsize); |
---|
| 2281 | if (newinvperm == NULL) { |
---|
| 2282 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2283 | return(0); |
---|
| 2284 | } |
---|
| 2285 | unique->memused += (newsize - unique->maxSizeZ) * ((numSlots+1) * |
---|
| 2286 | sizeof(DdNode *) + 2 * sizeof(int) + sizeof(DdSubtable)); |
---|
| 2287 | if (newsize > unique->maxSize) { |
---|
| 2288 | FREE(unique->stack); |
---|
| 2289 | unique->stack = ALLOC(DdNodePtr,newsize + 1); |
---|
| 2290 | if (unique->stack == NULL) { |
---|
| 2291 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2292 | return(0); |
---|
| 2293 | } |
---|
| 2294 | unique->stack[0] = NULL; /* to suppress harmless UMR */ |
---|
| 2295 | unique->memused += |
---|
| 2296 | (newsize - ddMax(unique->maxSize,unique->maxSizeZ)) |
---|
| 2297 | * sizeof(DdNode *); |
---|
| 2298 | } |
---|
| 2299 | for (i = 0; i < oldsize; i++) { |
---|
| 2300 | newsubtables[i].slots = unique->subtableZ[i].slots; |
---|
| 2301 | newsubtables[i].shift = unique->subtableZ[i].shift; |
---|
| 2302 | newsubtables[i].keys = unique->subtableZ[i].keys; |
---|
| 2303 | newsubtables[i].maxKeys = unique->subtableZ[i].maxKeys; |
---|
| 2304 | newsubtables[i].dead = unique->subtableZ[i].dead; |
---|
| 2305 | newsubtables[i].nodelist = unique->subtableZ[i].nodelist; |
---|
| 2306 | newperm[i] = unique->permZ[i]; |
---|
| 2307 | newinvperm[i] = unique->invpermZ[i]; |
---|
| 2308 | } |
---|
| 2309 | for (i = oldsize; i <= index; i++) { |
---|
| 2310 | newsubtables[i].slots = numSlots; |
---|
| 2311 | newsubtables[i].shift = sizeof(int) * 8 - |
---|
| 2312 | cuddComputeFloorLog2(numSlots); |
---|
| 2313 | newsubtables[i].keys = 0; |
---|
| 2314 | newsubtables[i].maxKeys = numSlots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 2315 | newsubtables[i].dead = 0; |
---|
| 2316 | newperm[i] = i; |
---|
| 2317 | newinvperm[i] = i; |
---|
| 2318 | newnodelist = newsubtables[i].nodelist = ALLOC(DdNodePtr, numSlots); |
---|
| 2319 | if (newnodelist == NULL) { |
---|
| 2320 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2321 | return(0); |
---|
| 2322 | } |
---|
| 2323 | for (j = 0; (unsigned) j < numSlots; j++) { |
---|
| 2324 | newnodelist[j] = NULL; |
---|
| 2325 | } |
---|
| 2326 | } |
---|
| 2327 | FREE(unique->subtableZ); |
---|
| 2328 | unique->subtableZ = newsubtables; |
---|
| 2329 | unique->maxSizeZ = newsize; |
---|
| 2330 | FREE(unique->permZ); |
---|
| 2331 | unique->permZ = newperm; |
---|
| 2332 | FREE(unique->invpermZ); |
---|
| 2333 | unique->invpermZ = newinvperm; |
---|
| 2334 | } |
---|
| 2335 | unique->slots += (index + 1 - unique->sizeZ) * numSlots; |
---|
| 2336 | ddFixLimits(unique); |
---|
| 2337 | unique->sizeZ = index + 1; |
---|
| 2338 | |
---|
| 2339 | /* Now that the table is in a coherent state, update the ZDD |
---|
| 2340 | ** universe. We need to temporarily disable reordering, |
---|
| 2341 | ** because we cannot reorder without universe in place. |
---|
| 2342 | */ |
---|
| 2343 | |
---|
| 2344 | reorderSave = unique->autoDynZ; |
---|
| 2345 | unique->autoDynZ = 0; |
---|
| 2346 | cuddZddFreeUniv(unique); |
---|
| 2347 | if (!cuddZddInitUniv(unique)) { |
---|
| 2348 | unique->autoDynZ = reorderSave; |
---|
| 2349 | return(0); |
---|
| 2350 | } |
---|
| 2351 | unique->autoDynZ = reorderSave; |
---|
| 2352 | |
---|
| 2353 | return(1); |
---|
| 2354 | |
---|
| 2355 | } /* end of cuddResizeTableZdd */ |
---|
| 2356 | |
---|
| 2357 | |
---|
| 2358 | /**Function******************************************************************** |
---|
| 2359 | |
---|
| 2360 | Synopsis [Adjusts parameters of a table to slow down its growth.] |
---|
| 2361 | |
---|
| 2362 | Description [] |
---|
| 2363 | |
---|
| 2364 | SideEffects [None] |
---|
| 2365 | |
---|
| 2366 | SeeAlso [] |
---|
| 2367 | |
---|
| 2368 | ******************************************************************************/ |
---|
| 2369 | void |
---|
| 2370 | cuddSlowTableGrowth( |
---|
| 2371 | DdManager *unique) |
---|
| 2372 | { |
---|
| 2373 | int i; |
---|
| 2374 | |
---|
| 2375 | unique->maxCacheHard = unique->cacheSlots - 1; |
---|
| 2376 | unique->cacheSlack = - (int) (unique->cacheSlots + 1); |
---|
| 2377 | for (i = 0; i < unique->size; i++) { |
---|
| 2378 | unique->subtables[i].maxKeys <<= 2; |
---|
| 2379 | } |
---|
| 2380 | unique->gcFrac = DD_GC_FRAC_MIN; |
---|
| 2381 | unique->minDead = (unsigned) (DD_GC_FRAC_MIN * (double) unique->slots); |
---|
| 2382 | cuddShrinkDeathRow(unique); |
---|
| 2383 | (void) fprintf(unique->err,"Slowing down table growth: "); |
---|
| 2384 | (void) fprintf(unique->err,"GC fraction = %.2f\t", unique->gcFrac); |
---|
| 2385 | (void) fprintf(unique->err,"minDead = %u\n", unique->minDead); |
---|
| 2386 | |
---|
| 2387 | } /* end of cuddSlowTableGrowth */ |
---|
| 2388 | |
---|
| 2389 | |
---|
| 2390 | /*---------------------------------------------------------------------------*/ |
---|
| 2391 | /* Definition of static functions */ |
---|
| 2392 | /*---------------------------------------------------------------------------*/ |
---|
| 2393 | |
---|
| 2394 | |
---|
| 2395 | /**Function******************************************************************** |
---|
| 2396 | |
---|
| 2397 | Synopsis [Rehashes a ZDD unique subtable.] |
---|
| 2398 | |
---|
| 2399 | Description [] |
---|
| 2400 | |
---|
| 2401 | SideEffects [None] |
---|
| 2402 | |
---|
| 2403 | SeeAlso [cuddRehash] |
---|
| 2404 | |
---|
| 2405 | ******************************************************************************/ |
---|
| 2406 | static void |
---|
| 2407 | ddRehashZdd( |
---|
| 2408 | DdManager * unique, |
---|
| 2409 | int i) |
---|
| 2410 | { |
---|
| 2411 | unsigned int slots, oldslots; |
---|
| 2412 | int shift, oldshift; |
---|
| 2413 | int j, pos; |
---|
| 2414 | DdNodePtr *nodelist, *oldnodelist; |
---|
| 2415 | DdNode *node, *next; |
---|
| 2416 | extern DD_OOMFP MMoutOfMemory; |
---|
| 2417 | DD_OOMFP saveHandler; |
---|
| 2418 | |
---|
| 2419 | if (unique->slots > unique->looseUpTo) { |
---|
| 2420 | unique->minDead = (unsigned) (DD_GC_FRAC_LO * (double) unique->slots); |
---|
| 2421 | #ifdef DD_VERBOSE |
---|
| 2422 | if (unique->gcFrac == DD_GC_FRAC_HI) { |
---|
| 2423 | (void) fprintf(unique->err,"GC fraction = %.2f\t", |
---|
| 2424 | DD_GC_FRAC_LO); |
---|
| 2425 | (void) fprintf(unique->err,"minDead = %d\n", unique->minDead); |
---|
| 2426 | } |
---|
| 2427 | #endif |
---|
| 2428 | unique->gcFrac = DD_GC_FRAC_LO; |
---|
| 2429 | } |
---|
| 2430 | |
---|
| 2431 | assert(i != CUDD_MAXINDEX); |
---|
| 2432 | oldslots = unique->subtableZ[i].slots; |
---|
| 2433 | oldshift = unique->subtableZ[i].shift; |
---|
| 2434 | oldnodelist = unique->subtableZ[i].nodelist; |
---|
| 2435 | |
---|
| 2436 | /* Compute the new size of the subtable. Normally, we just |
---|
| 2437 | ** double. However, after reordering, a table may be severely |
---|
| 2438 | ** overloaded. Therefore, we iterate. */ |
---|
| 2439 | slots = oldslots; |
---|
| 2440 | shift = oldshift; |
---|
| 2441 | do { |
---|
| 2442 | slots <<= 1; |
---|
| 2443 | shift--; |
---|
| 2444 | } while (slots * DD_MAX_SUBTABLE_DENSITY < unique->subtableZ[i].keys); |
---|
| 2445 | |
---|
| 2446 | saveHandler = MMoutOfMemory; |
---|
| 2447 | MMoutOfMemory = Cudd_OutOfMem; |
---|
| 2448 | nodelist = ALLOC(DdNodePtr, slots); |
---|
| 2449 | MMoutOfMemory = saveHandler; |
---|
| 2450 | if (nodelist == NULL) { |
---|
| 2451 | (void) fprintf(unique->err, |
---|
| 2452 | "Unable to resize ZDD subtable %d for lack of memory.\n", |
---|
| 2453 | i); |
---|
| 2454 | (void) cuddGarbageCollect(unique,1); |
---|
| 2455 | for (j = 0; j < unique->sizeZ; j++) { |
---|
| 2456 | unique->subtableZ[j].maxKeys <<= 1; |
---|
| 2457 | } |
---|
| 2458 | return; |
---|
| 2459 | } |
---|
| 2460 | unique->subtableZ[i].nodelist = nodelist; |
---|
| 2461 | unique->subtableZ[i].slots = slots; |
---|
| 2462 | unique->subtableZ[i].shift = shift; |
---|
| 2463 | unique->subtableZ[i].maxKeys = slots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 2464 | for (j = 0; (unsigned) j < slots; j++) { |
---|
| 2465 | nodelist[j] = NULL; |
---|
| 2466 | } |
---|
| 2467 | for (j = 0; (unsigned) j < oldslots; j++) { |
---|
| 2468 | node = oldnodelist[j]; |
---|
| 2469 | while (node != NULL) { |
---|
| 2470 | next = node->next; |
---|
| 2471 | pos = ddHash(cuddT(node), cuddE(node), shift); |
---|
| 2472 | node->next = nodelist[pos]; |
---|
| 2473 | nodelist[pos] = node; |
---|
| 2474 | node = next; |
---|
| 2475 | } |
---|
| 2476 | } |
---|
| 2477 | FREE(oldnodelist); |
---|
| 2478 | |
---|
| 2479 | #ifdef DD_VERBOSE |
---|
| 2480 | (void) fprintf(unique->err, |
---|
| 2481 | "rehashing layer %d: keys %d dead %d new size %d\n", |
---|
| 2482 | i, unique->subtableZ[i].keys, |
---|
| 2483 | unique->subtableZ[i].dead, slots); |
---|
| 2484 | #endif |
---|
| 2485 | |
---|
| 2486 | /* Update global data. */ |
---|
| 2487 | unique->memused += (slots - oldslots) * sizeof(DdNode *); |
---|
| 2488 | unique->slots += (slots - oldslots); |
---|
| 2489 | ddFixLimits(unique); |
---|
| 2490 | |
---|
| 2491 | } /* end of ddRehashZdd */ |
---|
| 2492 | |
---|
| 2493 | |
---|
| 2494 | /**Function******************************************************************** |
---|
| 2495 | |
---|
| 2496 | Synopsis [Increases the number of subtables in a unique table so |
---|
| 2497 | that it meets or exceeds index.] |
---|
| 2498 | |
---|
| 2499 | Description [Increases the number of subtables in a unique table so |
---|
| 2500 | that it meets or exceeds index. Returns 1 if successful; 0 otherwise.] |
---|
| 2501 | |
---|
| 2502 | SideEffects [None] |
---|
| 2503 | |
---|
| 2504 | SeeAlso [cuddResizeTableZdd] |
---|
| 2505 | |
---|
| 2506 | ******************************************************************************/ |
---|
| 2507 | static int |
---|
| 2508 | ddResizeTable( |
---|
| 2509 | DdManager * unique, |
---|
| 2510 | int index) |
---|
| 2511 | { |
---|
| 2512 | DdSubtable *newsubtables; |
---|
| 2513 | DdNodePtr *newnodelist; |
---|
| 2514 | DdNodePtr *newvars; |
---|
| 2515 | DdNode *sentinel = &(unique->sentinel); |
---|
| 2516 | int oldsize,newsize; |
---|
| 2517 | int i,j,reorderSave; |
---|
| 2518 | int numSlots = unique->initSlots; |
---|
| 2519 | int *newperm, *newinvperm, *newmap; |
---|
| 2520 | DdNode *one, *zero; |
---|
| 2521 | |
---|
| 2522 | oldsize = unique->size; |
---|
| 2523 | /* Easy case: there is still room in the current table. */ |
---|
| 2524 | if (index < unique->maxSize) { |
---|
| 2525 | for (i = oldsize; i <= index; i++) { |
---|
| 2526 | unique->subtables[i].slots = numSlots; |
---|
| 2527 | unique->subtables[i].shift = sizeof(int) * 8 - |
---|
| 2528 | cuddComputeFloorLog2(numSlots); |
---|
| 2529 | unique->subtables[i].keys = 0; |
---|
| 2530 | unique->subtables[i].maxKeys = numSlots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 2531 | unique->subtables[i].dead = 0; |
---|
| 2532 | unique->subtables[i].bindVar = 0; |
---|
| 2533 | unique->subtables[i].varType = CUDD_VAR_PRIMARY_INPUT; |
---|
| 2534 | unique->subtables[i].pairIndex = 0; |
---|
| 2535 | unique->subtables[i].varHandled = 0; |
---|
| 2536 | unique->subtables[i].varToBeGrouped = CUDD_LAZY_NONE; |
---|
| 2537 | |
---|
| 2538 | unique->perm[i] = i; |
---|
| 2539 | unique->invperm[i] = i; |
---|
| 2540 | newnodelist = unique->subtables[i].nodelist = |
---|
| 2541 | ALLOC(DdNodePtr, numSlots); |
---|
| 2542 | if (newnodelist == NULL) { |
---|
| 2543 | for (j = oldsize; j < i; j++) { |
---|
| 2544 | FREE(unique->subtables[j].nodelist); |
---|
| 2545 | } |
---|
| 2546 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2547 | return(0); |
---|
| 2548 | } |
---|
| 2549 | for (j = 0; j < numSlots; j++) { |
---|
| 2550 | newnodelist[j] = sentinel; |
---|
| 2551 | } |
---|
| 2552 | } |
---|
| 2553 | if (unique->map != NULL) { |
---|
| 2554 | for (i = oldsize; i <= index; i++) { |
---|
| 2555 | unique->map[i] = i; |
---|
| 2556 | } |
---|
| 2557 | } |
---|
| 2558 | } else { |
---|
| 2559 | /* The current table is too small: we need to allocate a new, |
---|
| 2560 | ** larger one; move all old subtables, and initialize the new |
---|
| 2561 | ** subtables up to index included. |
---|
| 2562 | */ |
---|
| 2563 | newsize = index + DD_DEFAULT_RESIZE; |
---|
| 2564 | #ifdef DD_VERBOSE |
---|
| 2565 | (void) fprintf(unique->err, |
---|
| 2566 | "Increasing the table size from %d to %d\n", |
---|
| 2567 | unique->maxSize, newsize); |
---|
| 2568 | #endif |
---|
| 2569 | newsubtables = ALLOC(DdSubtable,newsize); |
---|
| 2570 | if (newsubtables == NULL) { |
---|
| 2571 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2572 | return(0); |
---|
| 2573 | } |
---|
| 2574 | newvars = ALLOC(DdNodePtr,newsize); |
---|
| 2575 | if (newvars == NULL) { |
---|
| 2576 | FREE(newsubtables); |
---|
| 2577 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2578 | return(0); |
---|
| 2579 | } |
---|
| 2580 | newperm = ALLOC(int,newsize); |
---|
| 2581 | if (newperm == NULL) { |
---|
| 2582 | FREE(newsubtables); |
---|
| 2583 | FREE(newvars); |
---|
| 2584 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2585 | return(0); |
---|
| 2586 | } |
---|
| 2587 | newinvperm = ALLOC(int,newsize); |
---|
| 2588 | if (newinvperm == NULL) { |
---|
| 2589 | FREE(newsubtables); |
---|
| 2590 | FREE(newvars); |
---|
| 2591 | FREE(newperm); |
---|
| 2592 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2593 | return(0); |
---|
| 2594 | } |
---|
| 2595 | if (unique->map != NULL) { |
---|
| 2596 | newmap = ALLOC(int,newsize); |
---|
| 2597 | if (newmap == NULL) { |
---|
| 2598 | FREE(newsubtables); |
---|
| 2599 | FREE(newvars); |
---|
| 2600 | FREE(newperm); |
---|
| 2601 | FREE(newinvperm); |
---|
| 2602 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2603 | return(0); |
---|
| 2604 | } |
---|
| 2605 | unique->memused += (newsize - unique->maxSize) * sizeof(int); |
---|
| 2606 | } |
---|
| 2607 | unique->memused += (newsize - unique->maxSize) * ((numSlots+1) * |
---|
| 2608 | sizeof(DdNode *) + 2 * sizeof(int) + sizeof(DdSubtable)); |
---|
| 2609 | if (newsize > unique->maxSizeZ) { |
---|
| 2610 | FREE(unique->stack); |
---|
| 2611 | unique->stack = ALLOC(DdNodePtr,newsize + 1); |
---|
| 2612 | if (unique->stack == NULL) { |
---|
| 2613 | FREE(newsubtables); |
---|
| 2614 | FREE(newvars); |
---|
| 2615 | FREE(newperm); |
---|
| 2616 | FREE(newinvperm); |
---|
| 2617 | if (unique->map != NULL) { |
---|
| 2618 | FREE(newmap); |
---|
| 2619 | } |
---|
| 2620 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2621 | return(0); |
---|
| 2622 | } |
---|
| 2623 | unique->stack[0] = NULL; /* to suppress harmless UMR */ |
---|
| 2624 | unique->memused += |
---|
| 2625 | (newsize - ddMax(unique->maxSize,unique->maxSizeZ)) |
---|
| 2626 | * sizeof(DdNode *); |
---|
| 2627 | } |
---|
| 2628 | for (i = 0; i < oldsize; i++) { |
---|
| 2629 | newsubtables[i].slots = unique->subtables[i].slots; |
---|
| 2630 | newsubtables[i].shift = unique->subtables[i].shift; |
---|
| 2631 | newsubtables[i].keys = unique->subtables[i].keys; |
---|
| 2632 | newsubtables[i].maxKeys = unique->subtables[i].maxKeys; |
---|
| 2633 | newsubtables[i].dead = unique->subtables[i].dead; |
---|
| 2634 | newsubtables[i].nodelist = unique->subtables[i].nodelist; |
---|
| 2635 | newsubtables[i].bindVar = unique->subtables[i].bindVar; |
---|
| 2636 | newsubtables[i].varType = unique->subtables[i].varType; |
---|
| 2637 | newsubtables[i].pairIndex = unique->subtables[i].pairIndex; |
---|
| 2638 | newsubtables[i].varHandled = unique->subtables[i].varHandled; |
---|
| 2639 | newsubtables[i].varToBeGrouped = unique->subtables[i].varToBeGrouped; |
---|
| 2640 | |
---|
| 2641 | newvars[i] = unique->vars[i]; |
---|
| 2642 | newperm[i] = unique->perm[i]; |
---|
| 2643 | newinvperm[i] = unique->invperm[i]; |
---|
| 2644 | } |
---|
| 2645 | for (i = oldsize; i <= index; i++) { |
---|
| 2646 | newsubtables[i].slots = numSlots; |
---|
| 2647 | newsubtables[i].shift = sizeof(int) * 8 - |
---|
| 2648 | cuddComputeFloorLog2(numSlots); |
---|
| 2649 | newsubtables[i].keys = 0; |
---|
| 2650 | newsubtables[i].maxKeys = numSlots * DD_MAX_SUBTABLE_DENSITY; |
---|
| 2651 | newsubtables[i].dead = 0; |
---|
| 2652 | newsubtables[i].bindVar = 0; |
---|
| 2653 | newsubtables[i].varType = CUDD_VAR_PRIMARY_INPUT; |
---|
| 2654 | newsubtables[i].pairIndex = 0; |
---|
| 2655 | newsubtables[i].varHandled = 0; |
---|
| 2656 | newsubtables[i].varToBeGrouped = CUDD_LAZY_NONE; |
---|
| 2657 | |
---|
| 2658 | newperm[i] = i; |
---|
| 2659 | newinvperm[i] = i; |
---|
| 2660 | newnodelist = newsubtables[i].nodelist = ALLOC(DdNodePtr, numSlots); |
---|
| 2661 | if (newnodelist == NULL) { |
---|
| 2662 | unique->errorCode = CUDD_MEMORY_OUT; |
---|
| 2663 | return(0); |
---|
| 2664 | } |
---|
| 2665 | for (j = 0; j < numSlots; j++) { |
---|
| 2666 | newnodelist[j] = sentinel; |
---|
| 2667 | } |
---|
| 2668 | } |
---|
| 2669 | if (unique->map != NULL) { |
---|
| 2670 | for (i = 0; i < oldsize; i++) { |
---|
| 2671 | newmap[i] = unique->map[i]; |
---|
| 2672 | } |
---|
| 2673 | for (i = oldsize; i <= index; i++) { |
---|
| 2674 | newmap[i] = i; |
---|
| 2675 | } |
---|
| 2676 | FREE(unique->map); |
---|
| 2677 | unique->map = newmap; |
---|
| 2678 | } |
---|
| 2679 | FREE(unique->subtables); |
---|
| 2680 | unique->subtables = newsubtables; |
---|
| 2681 | unique->maxSize = newsize; |
---|
| 2682 | FREE(unique->vars); |
---|
| 2683 | unique->vars = newvars; |
---|
| 2684 | FREE(unique->perm); |
---|
| 2685 | unique->perm = newperm; |
---|
| 2686 | FREE(unique->invperm); |
---|
| 2687 | unique->invperm = newinvperm; |
---|
| 2688 | } |
---|
| 2689 | |
---|
| 2690 | /* Now that the table is in a coherent state, create the new |
---|
| 2691 | ** projection functions. We need to temporarily disable reordering, |
---|
| 2692 | ** because we cannot reorder without projection functions in place. |
---|
| 2693 | **/ |
---|
| 2694 | one = unique->one; |
---|
| 2695 | zero = Cudd_Not(one); |
---|
| 2696 | |
---|
| 2697 | unique->size = index + 1; |
---|
| 2698 | unique->slots += (index + 1 - oldsize) * numSlots; |
---|
| 2699 | ddFixLimits(unique); |
---|
| 2700 | |
---|
| 2701 | reorderSave = unique->autoDyn; |
---|
| 2702 | unique->autoDyn = 0; |
---|
| 2703 | for (i = oldsize; i <= index; i++) { |
---|
| 2704 | unique->vars[i] = cuddUniqueInter(unique,i,one,zero); |
---|
| 2705 | if (unique->vars[i] == NULL) { |
---|
| 2706 | unique->autoDyn = reorderSave; |
---|
| 2707 | for (j = oldsize; j < i; j++) { |
---|
| 2708 | Cudd_IterDerefBdd(unique,unique->vars[j]); |
---|
| 2709 | cuddDeallocNode(unique,unique->vars[j]); |
---|
| 2710 | unique->vars[j] = NULL; |
---|
| 2711 | } |
---|
| 2712 | for (j = oldsize; j <= index; j++) { |
---|
| 2713 | FREE(unique->subtables[j].nodelist); |
---|
| 2714 | unique->subtables[j].nodelist = NULL; |
---|
| 2715 | } |
---|
| 2716 | unique->size = oldsize; |
---|
| 2717 | unique->slots -= (index + 1 - oldsize) * numSlots; |
---|
| 2718 | ddFixLimits(unique); |
---|
| 2719 | return(0); |
---|
| 2720 | } |
---|
| 2721 | cuddRef(unique->vars[i]); |
---|
| 2722 | } |
---|
| 2723 | unique->autoDyn = reorderSave; |
---|
| 2724 | |
---|
| 2725 | return(1); |
---|
| 2726 | |
---|
| 2727 | } /* end of ddResizeTable */ |
---|
| 2728 | |
---|
| 2729 | |
---|
| 2730 | /**Function******************************************************************** |
---|
| 2731 | |
---|
| 2732 | Synopsis [Searches the subtables above node for a parent.] |
---|
| 2733 | |
---|
| 2734 | Description [Searches the subtables above node for a parent. Returns 1 |
---|
| 2735 | as soon as one parent is found. Returns 0 is the search is fruitless.] |
---|
| 2736 | |
---|
| 2737 | SideEffects [None] |
---|
| 2738 | |
---|
| 2739 | SeeAlso [] |
---|
| 2740 | |
---|
| 2741 | ******************************************************************************/ |
---|
| 2742 | static int |
---|
| 2743 | cuddFindParent( |
---|
| 2744 | DdManager * table, |
---|
| 2745 | DdNode * node) |
---|
| 2746 | { |
---|
| 2747 | int i,j; |
---|
| 2748 | int slots; |
---|
| 2749 | DdNodePtr *nodelist; |
---|
| 2750 | DdNode *f; |
---|
| 2751 | |
---|
| 2752 | for (i = cuddI(table,node->index) - 1; i >= 0; i--) { |
---|
| 2753 | nodelist = table->subtables[i].nodelist; |
---|
| 2754 | slots = table->subtables[i].slots; |
---|
| 2755 | |
---|
| 2756 | for (j = 0; j < slots; j++) { |
---|
| 2757 | f = nodelist[j]; |
---|
| 2758 | while (cuddT(f) > node) { |
---|
| 2759 | f = f->next; |
---|
| 2760 | } |
---|
| 2761 | while (cuddT(f) == node && Cudd_Regular(cuddE(f)) > node) { |
---|
| 2762 | f = f->next; |
---|
| 2763 | } |
---|
| 2764 | if (cuddT(f) == node && Cudd_Regular(cuddE(f)) == node) { |
---|
| 2765 | return(1); |
---|
| 2766 | } |
---|
| 2767 | } |
---|
| 2768 | } |
---|
| 2769 | |
---|
| 2770 | return(0); |
---|
| 2771 | |
---|
| 2772 | } /* end of cuddFindParent */ |
---|
| 2773 | |
---|
| 2774 | |
---|
| 2775 | /**Function******************************************************************** |
---|
| 2776 | |
---|
| 2777 | Synopsis [Adjusts the values of table limits.] |
---|
| 2778 | |
---|
| 2779 | Description [Adjusts the values of table fields controlling the. |
---|
| 2780 | sizes of subtables and computed table. If the computed table is too small |
---|
| 2781 | according to the new values, it is resized.] |
---|
| 2782 | |
---|
| 2783 | SideEffects [Modifies manager fields. May resize computed table.] |
---|
| 2784 | |
---|
| 2785 | SeeAlso [] |
---|
| 2786 | |
---|
| 2787 | ******************************************************************************/ |
---|
| 2788 | DD_INLINE |
---|
| 2789 | static void |
---|
| 2790 | ddFixLimits( |
---|
| 2791 | DdManager *unique) |
---|
| 2792 | { |
---|
| 2793 | unique->minDead = (unsigned) (unique->gcFrac * (double) unique->slots); |
---|
| 2794 | unique->cacheSlack = (int) ddMin(unique->maxCacheHard, |
---|
| 2795 | DD_MAX_CACHE_TO_SLOTS_RATIO * unique->slots) - |
---|
| 2796 | 2 * (int) unique->cacheSlots; |
---|
| 2797 | if (unique->cacheSlots < unique->slots/2 && unique->cacheSlack >= 0) |
---|
| 2798 | cuddCacheResize(unique); |
---|
| 2799 | return; |
---|
| 2800 | |
---|
| 2801 | } /* end of ddFixLimits */ |
---|
| 2802 | |
---|
| 2803 | |
---|
| 2804 | #ifndef DD_UNSORTED_FREE_LIST |
---|
| 2805 | #ifdef DD_RED_BLACK_FREE_LIST |
---|
| 2806 | /**Function******************************************************************** |
---|
| 2807 | |
---|
| 2808 | Synopsis [Inserts a DdNode in a red/black search tree.] |
---|
| 2809 | |
---|
| 2810 | Description [Inserts a DdNode in a red/black search tree. Nodes from |
---|
| 2811 | the same "page" (defined by DD_PAGE_MASK) are linked in a LIFO list.] |
---|
| 2812 | |
---|
| 2813 | SideEffects [None] |
---|
| 2814 | |
---|
| 2815 | SeeAlso [cuddOrderedThread] |
---|
| 2816 | |
---|
| 2817 | ******************************************************************************/ |
---|
| 2818 | static void |
---|
| 2819 | cuddOrderedInsert( |
---|
| 2820 | DdNodePtr * root, |
---|
| 2821 | DdNodePtr node) |
---|
| 2822 | { |
---|
| 2823 | DdNode *scan; |
---|
| 2824 | DdNodePtr *scanP; |
---|
| 2825 | DdNodePtr *stack[DD_STACK_SIZE]; |
---|
| 2826 | int stackN = 0; |
---|
| 2827 | |
---|
| 2828 | scanP = root; |
---|
| 2829 | while ((scan = *scanP) != NULL) { |
---|
| 2830 | stack[stackN++] = scanP; |
---|
| 2831 | if (DD_INSERT_COMPARE(node, scan) == 0) { /* add to page list */ |
---|
| 2832 | DD_NEXT(node) = DD_NEXT(scan); |
---|
| 2833 | DD_NEXT(scan) = node; |
---|
| 2834 | return; |
---|
| 2835 | } |
---|
| 2836 | scanP = (node < scan) ? &DD_LEFT(scan) : &DD_RIGHT(scan); |
---|
| 2837 | } |
---|
| 2838 | DD_RIGHT(node) = DD_LEFT(node) = DD_NEXT(node) = NULL; |
---|
| 2839 | DD_COLOR(node) = DD_RED; |
---|
| 2840 | *scanP = node; |
---|
| 2841 | stack[stackN] = &node; |
---|
| 2842 | cuddDoRebalance(stack,stackN); |
---|
| 2843 | |
---|
| 2844 | } /* end of cuddOrderedInsert */ |
---|
| 2845 | |
---|
| 2846 | |
---|
| 2847 | /**Function******************************************************************** |
---|
| 2848 | |
---|
| 2849 | Synopsis [Threads all the nodes of a search tree into a linear list.] |
---|
| 2850 | |
---|
| 2851 | Description [Threads all the nodes of a search tree into a linear |
---|
| 2852 | list. For each node of the search tree, the "left" child, if non-null, has |
---|
| 2853 | a lower address than its parent, and the "right" child, if non-null, has a |
---|
| 2854 | higher address than its parent. |
---|
| 2855 | The list is sorted in order of increasing addresses. The search |
---|
| 2856 | tree is destroyed as a result of this operation. The last element of |
---|
| 2857 | the linear list is made to point to the address passed in list. Each |
---|
| 2858 | node if the search tree is a linearly-linked list of nodes from the |
---|
| 2859 | same memory page (as defined in DD_PAGE_MASK). When a node is added to |
---|
| 2860 | the linear list, all the elements of the linked list are added.] |
---|
| 2861 | |
---|
| 2862 | SideEffects [The search tree is destroyed as a result of this operation.] |
---|
| 2863 | |
---|
| 2864 | SeeAlso [cuddOrderedInsert] |
---|
| 2865 | |
---|
| 2866 | ******************************************************************************/ |
---|
| 2867 | static DdNode * |
---|
| 2868 | cuddOrderedThread( |
---|
| 2869 | DdNode * root, |
---|
| 2870 | DdNode * list) |
---|
| 2871 | { |
---|
| 2872 | DdNode *current, *next, *prev, *end; |
---|
| 2873 | |
---|
| 2874 | current = root; |
---|
| 2875 | /* The first word in the node is used to implement a stack that holds |
---|
| 2876 | ** the nodes from the root of the tree to the current node. Here we |
---|
| 2877 | ** put the root of the tree at the bottom of the stack. |
---|
| 2878 | */ |
---|
| 2879 | *((DdNodePtr *) current) = NULL; |
---|
| 2880 | |
---|
| 2881 | while (current != NULL) { |
---|
| 2882 | if (DD_RIGHT(current) != NULL) { |
---|
| 2883 | /* If possible, we follow the "right" link. Eventually we'll |
---|
| 2884 | ** find the node with the largest address in the current tree. |
---|
| 2885 | ** In this phase we use the first word of a node to implemen |
---|
| 2886 | ** a stack of the nodes on the path from the root to "current". |
---|
| 2887 | ** Also, we disconnect the "right" pointers to indicate that |
---|
| 2888 | ** we have already followed them. |
---|
| 2889 | */ |
---|
| 2890 | next = DD_RIGHT(current); |
---|
| 2891 | DD_RIGHT(current) = NULL; |
---|
| 2892 | *((DdNodePtr *)next) = current; |
---|
| 2893 | current = next; |
---|
| 2894 | } else { |
---|
| 2895 | /* We can't proceed along the "right" links any further. |
---|
| 2896 | ** Hence "current" is the largest element in the current tree. |
---|
| 2897 | ** We make this node the new head of "list". (Repeating this |
---|
| 2898 | ** operation until the tree is empty yields the desired linear |
---|
| 2899 | ** threading of all nodes.) |
---|
| 2900 | */ |
---|
| 2901 | prev = *((DdNodePtr *) current); /* save prev node on stack in prev */ |
---|
| 2902 | /* Traverse the linked list of current until the end. */ |
---|
| 2903 | for (end = current; DD_NEXT(end) != NULL; end = DD_NEXT(end)); |
---|
| 2904 | DD_NEXT(end) = list; /* attach "list" at end and make */ |
---|
| 2905 | list = current; /* "current" the new head of "list" */ |
---|
| 2906 | /* Now, if current has a "left" child, we push it on the stack. |
---|
| 2907 | ** Otherwise, we just continue with the parent of "current". |
---|
| 2908 | */ |
---|
| 2909 | if (DD_LEFT(current) != NULL) { |
---|
| 2910 | next = DD_LEFT(current); |
---|
| 2911 | *((DdNodePtr *) next) = prev; |
---|
| 2912 | current = next; |
---|
| 2913 | } else { |
---|
| 2914 | current = prev; |
---|
| 2915 | } |
---|
| 2916 | } |
---|
| 2917 | } |
---|
| 2918 | |
---|
| 2919 | return(list); |
---|
| 2920 | |
---|
| 2921 | } /* end of cuddOrderedThread */ |
---|
| 2922 | |
---|
| 2923 | |
---|
| 2924 | /**Function******************************************************************** |
---|
| 2925 | |
---|
| 2926 | Synopsis [Performs the left rotation for red/black trees.] |
---|
| 2927 | |
---|
| 2928 | Description [] |
---|
| 2929 | |
---|
| 2930 | SideEffects [None] |
---|
| 2931 | |
---|
| 2932 | SeeAlso [cuddRotateRight] |
---|
| 2933 | |
---|
| 2934 | ******************************************************************************/ |
---|
| 2935 | DD_INLINE |
---|
| 2936 | static void |
---|
| 2937 | cuddRotateLeft( |
---|
| 2938 | DdNodePtr * nodeP) |
---|
| 2939 | { |
---|
| 2940 | DdNode *newRoot; |
---|
| 2941 | DdNode *oldRoot = *nodeP; |
---|
| 2942 | |
---|
| 2943 | *nodeP = newRoot = DD_RIGHT(oldRoot); |
---|
| 2944 | DD_RIGHT(oldRoot) = DD_LEFT(newRoot); |
---|
| 2945 | DD_LEFT(newRoot) = oldRoot; |
---|
| 2946 | |
---|
| 2947 | } /* end of cuddRotateLeft */ |
---|
| 2948 | |
---|
| 2949 | |
---|
| 2950 | /**Function******************************************************************** |
---|
| 2951 | |
---|
| 2952 | Synopsis [Performs the right rotation for red/black trees.] |
---|
| 2953 | |
---|
| 2954 | Description [] |
---|
| 2955 | |
---|
| 2956 | SideEffects [None] |
---|
| 2957 | |
---|
| 2958 | SeeAlso [cuddRotateLeft] |
---|
| 2959 | |
---|
| 2960 | ******************************************************************************/ |
---|
| 2961 | DD_INLINE |
---|
| 2962 | static void |
---|
| 2963 | cuddRotateRight( |
---|
| 2964 | DdNodePtr * nodeP) |
---|
| 2965 | { |
---|
| 2966 | DdNode *newRoot; |
---|
| 2967 | DdNode *oldRoot = *nodeP; |
---|
| 2968 | |
---|
| 2969 | *nodeP = newRoot = DD_LEFT(oldRoot); |
---|
| 2970 | DD_LEFT(oldRoot) = DD_RIGHT(newRoot); |
---|
| 2971 | DD_RIGHT(newRoot) = oldRoot; |
---|
| 2972 | |
---|
| 2973 | } /* end of cuddRotateRight */ |
---|
| 2974 | |
---|
| 2975 | |
---|
| 2976 | /**Function******************************************************************** |
---|
| 2977 | |
---|
| 2978 | Synopsis [Rebalances a red/black tree.] |
---|
| 2979 | |
---|
| 2980 | Description [] |
---|
| 2981 | |
---|
| 2982 | SideEffects [None] |
---|
| 2983 | |
---|
| 2984 | SeeAlso [] |
---|
| 2985 | |
---|
| 2986 | ******************************************************************************/ |
---|
| 2987 | static void |
---|
| 2988 | cuddDoRebalance( |
---|
| 2989 | DdNodePtr ** stack, |
---|
| 2990 | int stackN) |
---|
| 2991 | { |
---|
| 2992 | DdNodePtr *xP, *parentP, *grandpaP; |
---|
| 2993 | DdNode *x, *y, *parent, *grandpa; |
---|
| 2994 | |
---|
| 2995 | xP = stack[stackN]; |
---|
| 2996 | x = *xP; |
---|
| 2997 | /* Work our way back up, re-balancing the tree. */ |
---|
| 2998 | while (--stackN >= 0) { |
---|
| 2999 | parentP = stack[stackN]; |
---|
| 3000 | parent = *parentP; |
---|
| 3001 | if (DD_IS_BLACK(parent)) break; |
---|
| 3002 | /* Since the root is black, here a non-null grandparent exists. */ |
---|
| 3003 | grandpaP = stack[stackN-1]; |
---|
| 3004 | grandpa = *grandpaP; |
---|
| 3005 | if (parent == DD_LEFT(grandpa)) { |
---|
| 3006 | y = DD_RIGHT(grandpa); |
---|
| 3007 | if (y != NULL && DD_IS_RED(y)) { |
---|
| 3008 | DD_COLOR(parent) = DD_BLACK; |
---|
| 3009 | DD_COLOR(y) = DD_BLACK; |
---|
| 3010 | DD_COLOR(grandpa) = DD_RED; |
---|
| 3011 | x = grandpa; |
---|
| 3012 | stackN--; |
---|
| 3013 | } else { |
---|
| 3014 | if (x == DD_RIGHT(parent)) { |
---|
| 3015 | cuddRotateLeft(parentP); |
---|
| 3016 | DD_COLOR(x) = DD_BLACK; |
---|
| 3017 | } else { |
---|
| 3018 | DD_COLOR(parent) = DD_BLACK; |
---|
| 3019 | } |
---|
| 3020 | DD_COLOR(grandpa) = DD_RED; |
---|
| 3021 | cuddRotateRight(grandpaP); |
---|
| 3022 | break; |
---|
| 3023 | } |
---|
| 3024 | } else { |
---|
| 3025 | y = DD_LEFT(grandpa); |
---|
| 3026 | if (y != NULL && DD_IS_RED(y)) { |
---|
| 3027 | DD_COLOR(parent) = DD_BLACK; |
---|
| 3028 | DD_COLOR(y) = DD_BLACK; |
---|
| 3029 | DD_COLOR(grandpa) = DD_RED; |
---|
| 3030 | x = grandpa; |
---|
| 3031 | stackN--; |
---|
| 3032 | } else { |
---|
| 3033 | if (x == DD_LEFT(parent)) { |
---|
| 3034 | cuddRotateRight(parentP); |
---|
| 3035 | DD_COLOR(x) = DD_BLACK; |
---|
| 3036 | } else { |
---|
| 3037 | DD_COLOR(parent) = DD_BLACK; |
---|
| 3038 | } |
---|
| 3039 | DD_COLOR(grandpa) = DD_RED; |
---|
| 3040 | cuddRotateLeft(grandpaP); |
---|
| 3041 | } |
---|
| 3042 | } |
---|
| 3043 | } |
---|
| 3044 | DD_COLOR(*(stack[0])) = DD_BLACK; |
---|
| 3045 | |
---|
| 3046 | } /* end of cuddDoRebalance */ |
---|
| 3047 | #endif |
---|
| 3048 | #endif |
---|
| 3049 | |
---|
| 3050 | |
---|
| 3051 | /**Function******************************************************************** |
---|
| 3052 | |
---|
| 3053 | Synopsis [Fixes a variable tree after the insertion of new subtables.] |
---|
| 3054 | |
---|
| 3055 | Description [Fixes a variable tree after the insertion of new subtables. |
---|
| 3056 | After such an insertion, the low fields of the tree below the insertion |
---|
| 3057 | point are inconsistent.] |
---|
| 3058 | |
---|
| 3059 | SideEffects [None] |
---|
| 3060 | |
---|
| 3061 | SeeAlso [] |
---|
| 3062 | |
---|
| 3063 | ******************************************************************************/ |
---|
| 3064 | static void |
---|
| 3065 | ddPatchTree( |
---|
| 3066 | DdManager *dd, |
---|
| 3067 | MtrNode *treenode) |
---|
| 3068 | { |
---|
| 3069 | MtrNode *auxnode = treenode; |
---|
| 3070 | |
---|
| 3071 | while (auxnode != NULL) { |
---|
| 3072 | auxnode->low = dd->perm[auxnode->index]; |
---|
| 3073 | if (auxnode->child != NULL) { |
---|
| 3074 | ddPatchTree(dd, auxnode->child); |
---|
| 3075 | } |
---|
| 3076 | auxnode = auxnode->younger; |
---|
| 3077 | } |
---|
| 3078 | |
---|
| 3079 | return; |
---|
| 3080 | |
---|
| 3081 | } /* end of ddPatchTree */ |
---|
| 3082 | |
---|
| 3083 | |
---|
| 3084 | #ifdef DD_DEBUG |
---|
| 3085 | /**Function******************************************************************** |
---|
| 3086 | |
---|
| 3087 | Synopsis [Checks whether a collision list is ordered.] |
---|
| 3088 | |
---|
| 3089 | Description [] |
---|
| 3090 | |
---|
| 3091 | SideEffects [None] |
---|
| 3092 | |
---|
| 3093 | SeeAlso [] |
---|
| 3094 | |
---|
| 3095 | ******************************************************************************/ |
---|
| 3096 | static int |
---|
| 3097 | cuddCheckCollisionOrdering( |
---|
| 3098 | DdManager *unique, |
---|
| 3099 | int i, |
---|
| 3100 | int j) |
---|
| 3101 | { |
---|
| 3102 | int slots; |
---|
| 3103 | DdNode *node, *next; |
---|
| 3104 | DdNodePtr *nodelist; |
---|
| 3105 | DdNode *sentinel = &(unique->sentinel); |
---|
| 3106 | |
---|
| 3107 | nodelist = unique->subtables[i].nodelist; |
---|
| 3108 | slots = unique->subtables[i].slots; |
---|
| 3109 | node = nodelist[j]; |
---|
| 3110 | if (node == sentinel) return(1); |
---|
| 3111 | next = node->next; |
---|
| 3112 | while (next != sentinel) { |
---|
| 3113 | if (cuddT(node) < cuddT(next) || |
---|
| 3114 | (cuddT(node) == cuddT(next) && cuddE(node) < cuddE(next))) { |
---|
| 3115 | (void) fprintf(unique->err, |
---|
| 3116 | "Unordered list: index %u, position %d\n", i, j); |
---|
| 3117 | return(0); |
---|
| 3118 | } |
---|
| 3119 | node = next; |
---|
| 3120 | next = node->next; |
---|
| 3121 | } |
---|
| 3122 | return(1); |
---|
| 3123 | |
---|
| 3124 | } /* end of cuddCheckCollisionOrdering */ |
---|
| 3125 | #endif |
---|
| 3126 | |
---|
| 3127 | |
---|
| 3128 | |
---|
| 3129 | |
---|
| 3130 | /**Function******************************************************************** |
---|
| 3131 | |
---|
| 3132 | Synopsis [Reports problem in garbage collection.] |
---|
| 3133 | |
---|
| 3134 | Description [] |
---|
| 3135 | |
---|
| 3136 | SideEffects [None] |
---|
| 3137 | |
---|
| 3138 | SeeAlso [cuddGarbageCollect cuddGarbageCollectZdd] |
---|
| 3139 | |
---|
| 3140 | ******************************************************************************/ |
---|
| 3141 | static void |
---|
| 3142 | ddReportRefMess( |
---|
| 3143 | DdManager *unique /* manager */, |
---|
| 3144 | int i /* table in which the problem occurred */, |
---|
| 3145 | const char *caller /* procedure that detected the problem */) |
---|
| 3146 | { |
---|
| 3147 | if (i == CUDD_CONST_INDEX) { |
---|
| 3148 | (void) fprintf(unique->err, |
---|
| 3149 | "%s: problem in constants\n", caller); |
---|
| 3150 | } else if (i != -1) { |
---|
| 3151 | (void) fprintf(unique->err, |
---|
| 3152 | "%s: problem in table %d\n", caller, i); |
---|
| 3153 | } |
---|
| 3154 | (void) fprintf(unique->err, " dead count != deleted\n"); |
---|
| 3155 | (void) fprintf(unique->err, " This problem is often due to a missing \ |
---|
| 3156 | call to Cudd_Ref\n or to an extra call to Cudd_RecursiveDeref.\n \ |
---|
| 3157 | See the CUDD Programmer's Guide for additional details."); |
---|
| 3158 | abort(); |
---|
| 3159 | |
---|
| 3160 | } /* end of ddReportRefMess */ |
---|