1 | /**CFile*********************************************************************** |
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2 | |
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3 | FileName [grabBMC.c] |
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4 | |
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5 | PackageName [grab] |
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6 | |
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7 | Synopsis [Check abstract paths on a more concrete model using SAT.] |
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8 | |
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9 | Description [Abstract paths are given in an array of MDDs, which |
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10 | capture multiple abstract paths at the same time. MDDs are encoded |
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11 | as AIG graph to allow the check in the more concrete model.] |
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12 | |
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13 | Author [Chao Wang] |
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14 | |
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15 | Copyright [Copyright (c) 2004 The Regents of the Univ. of Colorado. |
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16 | All rights reserved. |
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17 | |
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18 | Permission is hereby granted, without written agreement and without |
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19 | license or royalty fees, to use, copy, modify, and distribute this |
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20 | software and its documentation for any purpose, provided that the |
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21 | above copyright notice and the following two paragraphs appear in |
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22 | all copies of this software.] |
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23 | |
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24 | ******************************************************************************/ |
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25 | |
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26 | #include "grabInt.h" |
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27 | #include "bmcInt.h" |
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28 | |
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29 | /*---------------------------------------------------------------------------*/ |
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30 | /* Constant declarations */ |
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31 | /*---------------------------------------------------------------------------*/ |
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32 | |
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33 | /*---------------------------------------------------------------------------*/ |
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34 | /* Structure declarations */ |
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35 | /*---------------------------------------------------------------------------*/ |
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36 | |
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37 | /*---------------------------------------------------------------------------*/ |
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38 | /* Type declarations */ |
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39 | /*---------------------------------------------------------------------------*/ |
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40 | |
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41 | /*---------------------------------------------------------------------------*/ |
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42 | /* Variable declarations */ |
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43 | /*---------------------------------------------------------------------------*/ |
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44 | |
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45 | /*---------------------------------------------------------------------------*/ |
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46 | /* Macro declarations */ |
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47 | /*---------------------------------------------------------------------------*/ |
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48 | |
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49 | /**AutomaticStart*************************************************************/ |
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50 | |
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51 | /*---------------------------------------------------------------------------*/ |
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52 | /* Static function prototypes */ |
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53 | /*---------------------------------------------------------------------------*/ |
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54 | |
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55 | static bAigEdge_t GrabConvertBddToBaig(bAig_Manager_t *bAigManager, bdd_t *fn, st_table *bddidToNames); |
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56 | static st_table * GrabBddGetSupportBaigNames(mdd_manager *mddManager, mdd_t *f); |
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57 | static char * GrabBddIdToBaigNames(mdd_manager *mddManager, int bddid); |
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58 | |
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59 | /**AutomaticEnd***************************************************************/ |
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60 | |
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61 | /*---------------------------------------------------------------------------*/ |
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62 | /* Definition of exported functions */ |
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63 | /*---------------------------------------------------------------------------*/ |
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64 | |
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65 | /**Function******************************************************************** |
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66 | |
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67 | Synopsis [Check if the abstract paths exist in the model.] |
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68 | |
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69 | Description [Check if the abstract paths exist in the model. The |
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70 | paths are given as set of onion rings, where each ring is a set of |
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71 | states. The model is defined by the set of latches in absLatches.] |
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72 | |
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73 | SideEffects [] |
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74 | |
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75 | ******************************************************************************/ |
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76 | boolean |
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77 | Bmc_AbstractCheckAbstractTraces( |
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78 | Ntk_Network_t *network, |
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79 | array_t *synOnionRings, |
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80 | st_table *absLatches, |
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81 | int verbose, |
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82 | int dbgLevel, |
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83 | int printInputs) |
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84 | { |
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85 | int pathLength = array_n(synOnionRings) -1; |
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86 | mAig_Manager_t *maigManager = Ntk_NetworkReadMAigManager(network); |
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87 | st_table *nodeToMvfAigTable = NIL(st_table); |
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88 | BmcCnfClauses_t *cnfClauses; |
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89 | FILE *cnfFile; |
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90 | BmcOption_t *options; |
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91 | array_t *result; |
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92 | int i; |
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93 | boolean CexExit = FALSE; |
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94 | |
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95 | nodeToMvfAigTable = |
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96 | (st_table *) Ntk_NetworkReadApplInfo(network, MVFAIG_NETWORK_APPL_KEY); |
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97 | if (nodeToMvfAigTable == NIL(st_table)){ |
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98 | fprintf(vis_stderr, |
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99 | "** bmc error: please run buid_partiton_maigs first\n"); |
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100 | return CexExit; |
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101 | } |
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102 | |
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103 | options = BmcOptionAlloc(); |
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104 | if (verbose) { |
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105 | options->dbgLevel = dbgLevel; |
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106 | options->printInputs = printInputs; |
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107 | } |
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108 | options->satInFile = BmcCreateTmpFile(); |
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109 | if (options->satInFile == NIL(char)){ |
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110 | BmcOptionFree(options); |
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111 | return CexExit; |
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112 | } |
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113 | |
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114 | /* create SAT Solver output file */ |
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115 | options->satOutFile = BmcCreateTmpFile(); |
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116 | if (options->satOutFile == NIL(char)){ |
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117 | BmcOptionFree(options); |
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118 | fprintf(vis_stderr, "** bmc error: Cannot allocate a temp file name\n"); |
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119 | return CexExit; |
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120 | } |
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121 | cnfFile = Cmd_FileOpen(options->satInFile, "w", NIL(char *), 0); |
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122 | if (cnfFile == NIL(FILE)) { |
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123 | BmcOptionFree(options); |
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124 | fprintf(vis_stderr, "** bmc error: Cannot create CNF output file %s\n", |
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125 | options->satInFile); |
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126 | return CexExit; |
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127 | } |
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128 | |
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129 | /* Unroll the model exactly 'pathLength' time frames |
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130 | */ |
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131 | cnfClauses = BmcCnfClausesAlloc(); |
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132 | BmcCnfGenerateClausesForPath(network, 0, pathLength, BMC_INITIAL_STATES, |
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133 | cnfClauses, nodeToMvfAigTable, absLatches); |
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134 | |
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135 | /* Generate the constraints from the abstract paths |
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136 | * (1) build a bAigEdge_t (graph) for each ring |
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137 | * (2) add all the cnf clauses that describe this graph |
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138 | * (3) make the output bAigEdge_t equals to 1 |
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139 | */ |
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140 | { |
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141 | bAigEdge_t bAigState; |
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142 | mdd_manager *mddManager = Ntk_NetworkReadMddManager(network); |
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143 | array_t *clause = array_alloc(int, 1); |
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144 | mdd_t *ring; |
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145 | |
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146 | arrayForEachItem(mdd_t *, synOnionRings, i, ring) { |
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147 | st_table *bddidTobAigNames; |
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148 | bddidTobAigNames = GrabBddGetSupportBaigNames(mddManager, ring); |
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149 | bAigState = GrabConvertBddToBaig(maigManager, ring, bddidTobAigNames); |
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150 | { |
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151 | st_generator *stgen; |
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152 | long tmpId; |
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153 | char *tmpStr; |
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154 | st_foreach_item(bddidTobAigNames, stgen, &tmpId, &tmpStr) { |
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155 | FREE(tmpStr); |
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156 | } |
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157 | st_free_table(bddidTobAigNames); |
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158 | } |
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159 | array_insert(int, clause, 0, BmcGenerateCnfFormulaForAigFunction( |
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160 | maigManager, bAigState, i, cnfClauses)); |
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161 | BmcCnfInsertClause(cnfClauses, clause); |
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162 | } |
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163 | |
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164 | array_free(clause); |
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165 | } |
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166 | |
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167 | /* Call the SAT solver |
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168 | */ |
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169 | BmcWriteClauses(maigManager, cnfFile, cnfClauses, options); |
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170 | fclose(cnfFile); |
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171 | result = BmcCheckSAT(options); |
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172 | if(result != NIL(array_t)){ |
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173 | if (verbose >= 1 && dbgLevel ==1) { |
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174 | fprintf(vis_stdout,"Found Counterexample of length = %d\n", pathLength); |
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175 | BmcPrintCounterExample(network, nodeToMvfAigTable, cnfClauses, |
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176 | result, pathLength+1, absLatches, options, |
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177 | NIL(array_t)); |
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178 | } |
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179 | if (verbose >=1 && dbgLevel == 2) { |
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180 | BmcPrintCounterExampleAiger(network, nodeToMvfAigTable, cnfClauses, |
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181 | result, pathLength+1, absLatches, options, |
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182 | NIL(array_t)); |
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183 | } |
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184 | CexExit = TRUE; |
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185 | } |
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186 | |
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187 | /* free all used memories */ |
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188 | BmcCnfClausesFree(cnfClauses); |
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189 | array_free(result); |
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190 | BmcOptionFree(options); |
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191 | |
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192 | return CexExit; |
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193 | } |
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194 | |
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195 | |
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196 | /**Function******************************************************************** |
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197 | |
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198 | Synopsis [Check if the abstract paths exist in the fine-grain model.] |
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199 | |
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200 | Description [Check if the abstract paths exist in the fine-grain |
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201 | model. The paths are given as set of onion rings, where each ring is |
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202 | a set of states. The model is defined by the set of latches |
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203 | (absLatches) and bnvs (absBnvs). The entire set of bnvs of the |
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204 | network are stored in the table coiBnvTable. |
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205 | |
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206 | This procedure first build a NEW maig graph (for the fine-grain |
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207 | model), then check if the abstract paths exist in the model. |
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208 | |
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209 | Before it returns, the previous maig graph is restored.] |
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210 | |
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211 | SideEffects [] |
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212 | |
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213 | ******************************************************************************/ |
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214 | boolean |
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215 | Bmc_AbstractCheckAbstractTracesWithFineGrain( |
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216 | Ntk_Network_t *network, |
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217 | st_table *coiBnvTable, |
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218 | array_t *synOnionRings, |
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219 | st_table *absLatches, |
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220 | st_table *absBnvs) |
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221 | { |
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222 | boolean result; |
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223 | mAigManagerState_t oldMaigState; /* to store the previous AIG */ |
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224 | mAig_Manager_t *maigManager; |
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225 | lsGen lsgen; |
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226 | Ntk_Node_t *node; |
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227 | int mAigId; |
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228 | int i; |
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229 | st_generator *stgen; |
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230 | st_table *leaves; |
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231 | array_t *roots, *combInputs; |
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232 | |
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233 | /* save the existing maigManager */ |
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234 | oldMaigState.manager = Ntk_NetworkReadMAigManager(network); |
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235 | oldMaigState.nodeToMvfAigTable = |
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236 | (st_table *) Ntk_NetworkReadApplInfo(network, MVFAIG_NETWORK_APPL_KEY); |
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237 | oldMaigState.nodeToMAigIdTable = st_init_table(st_ptrcmp, st_ptrhash); |
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238 | Ntk_NetworkForEachNode(network, lsgen, node) { |
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239 | mAigId = Ntk_NodeReadMAigId(node); |
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240 | st_insert(oldMaigState.nodeToMAigIdTable, node, (char *)(long)mAigId); |
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241 | Ntk_NodeSetMAigId(node, ntmaig_UNUSED); |
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242 | } |
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243 | |
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244 | /* create a new maigManager */ |
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245 | maigManager = mAig_initAig(); |
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246 | Ntk_NetworkSetMAigManager(network, maigManager); |
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247 | Ntk_NetworkSetApplInfo(network, MVFAIG_NETWORK_APPL_KEY, |
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248 | (Ntk_ApplInfoFreeFn) ntmAig_MvfAigTableFreeCallback, |
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249 | (void *) st_init_table(st_ptrcmp, st_ptrhash)); |
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250 | |
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251 | /* roots are the visible latches, and the visible bnvs (some bnvs |
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252 | * may not be in the transitive fan-in cone of the visible latches |
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253 | */ |
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254 | roots = array_alloc(Ntk_Node_t *, 0); |
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255 | st_foreach_item(absLatches, stgen, &node, NIL(char *)) { |
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256 | array_insert_last(Ntk_Node_t *, roots, Ntk_LatchReadDataInput(node)); |
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257 | array_insert_last(Ntk_Node_t *, roots, Ntk_LatchReadInitialInput(node)); |
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258 | } |
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259 | st_foreach_item(absBnvs, stgen, &node, NIL(char *)) { |
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260 | array_insert_last(Ntk_Node_t *, roots, node); |
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261 | } |
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262 | |
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263 | combInputs = Ntk_NodeComputeTransitiveFaninNodes(network, roots, |
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264 | TRUE, /* stopAtLatches */ |
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265 | FALSE /* combInputsOnly*/ |
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266 | ); |
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267 | |
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268 | /* leaves are the combinational inputs or the invisible bnvs */ |
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269 | leaves = st_init_table(st_ptrcmp, st_ptrhash); |
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270 | arrayForEachItem(Ntk_Node_t *, combInputs, i, node) { |
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271 | if ( Ntk_NodeTestIsCombInput(node) || |
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272 | ( st_is_member(coiBnvTable, node) && |
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273 | !st_is_member(absBnvs, node) ) ) { |
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274 | st_insert(leaves, node, (char *) ntmaig_UNUSED); |
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275 | Ntk_NodeSetMAigId(node, mAig_CreateVar(maigManager, |
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276 | Ntk_NodeReadName(node), |
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277 | Var_VariableReadNumValues(Ntk_NodeReadVariable(node)))); |
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278 | } |
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279 | } |
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280 | st_foreach_item(absLatches, stgen, &node, NIL(char *)) { |
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281 | if (!st_is_member(leaves, node)) { |
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282 | st_insert(leaves, node, (char *) ntmaig_UNUSED); |
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283 | Ntk_NodeSetMAigId(node, mAig_CreateVar(maigManager, |
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284 | Ntk_NodeReadName(node), |
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285 | Var_VariableReadNumValues(Ntk_NodeReadVariable(node)))); |
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286 | } |
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287 | } |
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288 | array_free(combInputs); |
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289 | |
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290 | #if 1 |
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291 | /* THIS SEEMS UNNECESSARY---IT'S HERE TO AVOID ERRORS IN CALLING |
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292 | * ntmaig_NetworkBuildMvfAigs() |
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293 | */ |
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294 | Ntk_NetworkForEachCombInput(network, lsgen, node) { |
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295 | if (Ntk_NodeReadMAigId(node) == NTK_UNASSIGNED_MAIG_ID) { |
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296 | Ntk_NodeSetMAigId(node, mAig_CreateVar(maigManager, |
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297 | Ntk_NodeReadName(node), |
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298 | Var_VariableReadNumValues(Ntk_NodeReadVariable(node)))); |
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299 | } |
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300 | } |
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301 | #endif |
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302 | |
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303 | /* build the new AIG graph */ |
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304 | ntmaig_NetworkBuildMvfAigs(network, roots, leaves); |
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305 | |
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306 | array_free(roots); |
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307 | st_free_table(leaves); |
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308 | |
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309 | |
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310 | /* check the existence of the abstract path on the new AIG graph */ |
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311 | result = Bmc_AbstractCheckAbstractTraces(network, |
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312 | synOnionRings, |
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313 | absLatches, |
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314 | 0, 0, 0); |
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315 | |
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316 | /* restore the previous maigManager */ |
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317 | mAig_quit(maigManager); |
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318 | Ntk_NetworkFreeApplInfo(network, MVFAIG_NETWORK_APPL_KEY); |
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319 | Ntk_NetworkSetMAigManager(network, oldMaigState.manager); |
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320 | Ntk_NetworkSetApplInfo(network, MVFAIG_NETWORK_APPL_KEY, |
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321 | (Ntk_ApplInfoFreeFn) ntmAig_MvfAigTableFreeCallback, |
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322 | (void *) oldMaigState.nodeToMvfAigTable); |
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323 | st_foreach_item(oldMaigState.nodeToMAigIdTable, stgen, &node, |
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324 | &mAigId) { |
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325 | Ntk_NodeSetMAigId(node, mAigId); |
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326 | } |
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327 | st_free_table(oldMaigState.nodeToMAigIdTable); |
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328 | |
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329 | return result; |
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330 | } |
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331 | |
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332 | /*---------------------------------------------------------------------------*/ |
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333 | /* Definition of static functions */ |
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334 | /*---------------------------------------------------------------------------*/ |
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335 | |
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336 | /**Function******************************************************************** |
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337 | |
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338 | Synopsis [Build the binary Aig for a given bdd] |
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339 | |
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340 | SideEffects [Build the binary Aig for a given bdd. We assume that |
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341 | the return bdd nodes from the foreach_bdd_node are in the order from |
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342 | childeren to parent. i.e all the childeren nodes are returned before |
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343 | the parent node. |
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344 | |
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345 | bddidToNames is a hash table from bddid to its bAigEdge_t name. If |
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346 | provided, this table should contain entiries for all the bddid in |
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347 | the support.] |
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348 | |
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349 | SideEffects [] |
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350 | |
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351 | SeeAlso [] |
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352 | |
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353 | ******************************************************************************/ |
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354 | static bAigEdge_t |
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355 | GrabConvertBddToBaig( |
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356 | bAig_Manager_t *bAigManager, |
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357 | bdd_t *fn, |
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358 | st_table *bddidToNames) |
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359 | { |
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360 | bdd_gen *gen; |
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361 | bdd_node *node, *thenNode, *elseNode, *funcNode; |
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362 | bdd_manager *bddManager = bdd_get_manager(fn); |
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363 | bdd_node *one = bdd_read_one(bddManager); |
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364 | /*bdd_node *zero = bdd_read_logic_zero(bddManager);*/ |
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365 | int is_complemented; |
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366 | int flag; |
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367 | bAigEdge_t var, left, right, result; |
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368 | char *name; |
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369 | st_table *bddTObaigTable; |
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370 | |
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371 | bddTObaigTable = st_init_table(st_numcmp, st_numhash); |
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372 | |
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373 | if (fn == NULL){ |
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374 | return bAig_NULL; |
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375 | } |
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376 | |
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377 | st_insert(bddTObaigTable, (char *) (long) bdd_regular(one), |
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378 | (char *) bAig_One); |
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379 | |
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380 | funcNode = bdd_get_node(fn, &is_complemented); |
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381 | |
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382 | if (bdd_is_constant(funcNode)){ |
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383 | flag = st_lookup(bddTObaigTable, |
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384 | (char *) (long) (funcNode), |
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385 | &result); |
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386 | assert(flag); |
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387 | st_free_table(bddTObaigTable); |
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388 | |
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389 | if (is_complemented) |
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390 | return bAig_Not(result); |
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391 | else |
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392 | return result; |
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393 | } |
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394 | |
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395 | foreach_bdd_node(fn, gen, node){ |
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396 | /* if the node has been processed, skip it. (the constant ONE |
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397 | * should be the only node falls into this category). |
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398 | */ |
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399 | if (st_is_member(bddTObaigTable, (char *) (long) bdd_regular(node))) |
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400 | continue; |
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401 | |
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402 | /* bdd_node_read_index() return the current level's bddId */ |
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403 | if (bddidToNames) { |
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404 | flag = st_lookup(bddidToNames, (char *)(long)bdd_node_read_index(node), |
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405 | &name); |
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406 | assert(flag); |
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407 | name = util_strsav(name); |
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408 | }else { |
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409 | char tempString[1024]; |
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410 | sprintf(tempString, "BDD%d", bdd_node_read_index(node)); |
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411 | name = util_strsav(tempString); |
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412 | } |
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413 | |
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414 | /* Create or Retrieve the bAigEdge_t w.r.t. 'name' */ |
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415 | var = bAig_CreateVarNode(bAigManager, name); |
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416 | FREE(name); |
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417 | |
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418 | thenNode = bdd_bdd_T(node); |
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419 | flag = st_lookup(bddTObaigTable, (char *) (long) bdd_regular(thenNode), |
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420 | &left); |
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421 | assert(flag); |
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422 | |
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423 | elseNode = bdd_bdd_E(node); |
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424 | flag = st_lookup(bddTObaigTable, (char *) (long) bdd_regular(elseNode), |
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425 | &right); |
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426 | assert(flag); |
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427 | |
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428 | /* should we test here whether elseNode is complemented arc? */ |
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429 | if (bdd_is_complement(elseNode)) |
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430 | right = bAig_Not(right); |
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431 | |
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432 | result = bAig_Or(bAigManager, bAig_And(bAigManager, var, left), |
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433 | bAig_And(bAigManager, bAig_Not(var), right)); |
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434 | st_insert(bddTObaigTable, (char *) (long) bdd_regular(node), |
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435 | (char *) (long) result); |
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436 | } |
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437 | flag = st_lookup(bddTObaigTable, (char *) (long) bdd_regular(funcNode), |
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438 | &result); |
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439 | assert(flag); |
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440 | st_free_table(bddTObaigTable); |
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441 | |
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442 | if (is_complemented){ |
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443 | return bAig_Not(result); |
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444 | } else { |
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445 | return result; |
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446 | } |
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447 | } /* end of bAig_bddtobAig() */ |
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448 | |
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449 | |
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450 | /**Function******************************************************************** |
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451 | |
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452 | Synopsis [Get a (bddId,baigName) table for the supporting variableS.] |
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453 | |
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454 | SideEffects [Get a (bddId,baigName) table for the supporting |
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455 | variableS. The caller should free the returned table as well as the |
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456 | (char *) of its value field.] |
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457 | |
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458 | SeeAlso [] |
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459 | |
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460 | ******************************************************************************/ |
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461 | static st_table * |
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462 | GrabBddGetSupportBaigNames( |
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463 | mdd_manager *mddManager, |
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464 | mdd_t *f) |
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465 | { |
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466 | int numOfVars = bdd_num_vars(mddManager); |
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467 | st_table *bddidTObaigNames = st_init_table(st_numcmp, st_numhash); |
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468 | var_set_t *vset; |
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469 | int i; |
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470 | |
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471 | vset = bdd_get_support(f); |
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472 | for (i=0; i<numOfVars; i++) { |
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473 | if (var_set_get_elt(vset, i) == 1) { |
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474 | st_insert(bddidTObaigNames, (char *)(long)i, |
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475 | GrabBddIdToBaigNames(mddManager, i)); |
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476 | } |
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477 | } |
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478 | var_set_free(vset); |
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479 | |
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480 | return bddidTObaigNames; |
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481 | } |
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482 | |
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483 | /**Function******************************************************************** |
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484 | |
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485 | Synopsis [return the baigName of a bddid] |
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486 | |
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487 | SideEffects [The caller should free the returned char *. This |
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488 | function is based on the assumption that MDD and MAIG shares the |
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489 | same naming convention (which is true in VIS).] |
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490 | |
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491 | SeeAlso [] |
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492 | |
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493 | ******************************************************************************/ |
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494 | static char * |
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495 | GrabBddIdToBaigNames( |
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496 | mdd_manager *mddManager, |
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497 | int bddid) |
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498 | { |
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499 | array_t *mvar_list = mdd_ret_mvar_list(mddManager); |
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500 | array_t *bvar_list = mdd_ret_bvar_list(mddManager); |
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501 | bvar_type bv; |
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502 | mvar_type mv; |
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503 | int mddid, index, id; |
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504 | char *nodeName; |
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505 | char baigName[1024]; |
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506 | |
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507 | /* 1. from bddid, get mddid and the index of this bddid in the mddid |
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508 | */ |
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509 | bv = array_fetch(bvar_type, bvar_list, bddid); |
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510 | mddid = bv.mvar_id; |
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511 | mv = array_fetch(mvar_type, mvar_list, mddid); |
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512 | arrayForEachItem(int, mv.bvars, index, id) { |
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513 | if (id == bddid) |
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514 | break; |
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515 | } |
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516 | assert(index <= mv.encode_length -1); |
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517 | |
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518 | /* 2. assumptions: (1) mv.name = nodeName, |
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519 | * (2) index is the same for MDD and MAIG |
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520 | */ |
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521 | nodeName = mv.name; |
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522 | |
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523 | /* 3. the baigEdge_t's name is ("%s_%d",nodeName,index) |
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524 | */ |
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525 | sprintf(baigName, "%s_%d", nodeName, index); |
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526 | |
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527 | return util_strsav(baigName); |
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528 | } |
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529 | |
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530 | |
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531 | |
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532 | |
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533 | |
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534 | |
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