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composebddnode

NAME

composebddnode - substitutes a variable by a bdd in another bdd.

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SYNOPSYS

 #include "bdd101.h"
 bddnode *composebddnode( BddSystem, BddNode, Variable, BddSubst )
   bddsystem *BddSystem;
   bddnode   *BddNode;
   bddvar     Variable;
   bddnode   *BddSubst;
 

PARAMETERS

BddSystem

The bdd system.

BddNode

The bdd node.

Variable

The variable to find.

BddSubst

The bdd to substitute with.

DESCRIPTION

composebddnode substitutes all the occurency of the variable Variable in the bdd node BddNode by the bdd node BddSubst, in the bdd system BddSystem. If a null pointer is given, the default bdd system is used.

RETURN VALUE

composebddnode returns the resulting bdd node.

ERRORS

"variable xxx out of range, error !"

The Variable parameter must be less or equal to the BddSystem->NUMBER_VAR field.

EXAMPLE

 #include "bdd101.h"
    bddsystem  *BddSystem;
    bddcircuit *BddCircuit;
    bddnode    *BddVariable;
    bddnode    *BddNode;
    bddnode    *BddSubst;
    chain_list *Expr;
    bddvar         Variable;
    BddSystem  = createbddsystem( 100, 1000, 100, 50000 );
    BddCircuit = createbddcircuit( "hello_world", 10, 10, BddSystem );
    Expr = createablbinexpr( ABL_AND,
                             createablatom( "i0" ),
                             createablatom( "i1" ) );
    BddNode = addbddcircuitabl( BddCircuit, Expr );
    freeablexpr( Expr );
    Expr = createablbinexpr( ABL_OR,
                             createablatom( "i2" ),
                             createablatom( "i3" ) );
    BddSubst = addbddcircuitabl( BddCircuit, Expr );
    freeablexpr( Expr );
    BddVariable = searchbddcircuitin( (bddcircuit *)0, "i0" );
    Variable = getbddvarbyindex( (bddsystem *)0, BddVariable->INDEX );
    BddNode = composebddnode( (bddsystem *)0, BddNode, Variable, BddSubst );
    Expr = convertbddcircuitabl( BddCircuit, BddNode );
    /* displays (i1 and (i2 or i3)) */
    viewablexpr( Expr, ABL_VIEW_VHDL );
    freeablexpr( Expr );
    destroybddsystem( (bddsystem *)0 );
    destroybddcircuit( (bddcircuit *)0 );
 

SEE ALSO

bdd(1)

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