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Diffstat (limited to 'src/temp/ver/verFormula.c')
| -rw-r--r-- | src/temp/ver/verFormula.c | 408 |
1 files changed, 408 insertions, 0 deletions
diff --git a/src/temp/ver/verFormula.c b/src/temp/ver/verFormula.c new file mode 100644 index 00000000..7edb5bd9 --- /dev/null +++ b/src/temp/ver/verFormula.c @@ -0,0 +1,408 @@ +/**CFile**************************************************************** + + FileName [verFormula.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [Verilog parser.] + + Synopsis [Formula parser to read Verilog assign statements.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - August 19, 2006.] + + Revision [$Id: verFormula.c,v 1.00 2006/08/19 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "ver.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +// the list of operation symbols to be used in expressions +#define VER_PARSE_SYM_OPEN '(' // opening paranthesis +#define VER_PARSE_SYM_CLOSE ')' // closing paranthesis +#define VER_PARSE_SYM_CONST0 '0' // constant 0 +#define VER_PARSE_SYM_CONST1 '1' // constant 1 +#define VER_PARSE_SYM_NEGBEF1 '!' // negation before the variable +#define VER_PARSE_SYM_NEGBEF2 '~' // negation before the variable +#define VER_PARSE_SYM_AND '&' // logic AND +#define VER_PARSE_SYM_OR '|' // logic OR +#define VER_PARSE_SYM_XOR '^' // logic XOR +#define VER_PARSE_SYM_MUX1 '?' // first symbol of MUX +#define VER_PARSE_SYM_MUX2 ':' // second symbol of MUX + +// the list of opcodes (also specifying operation precedence) +#define VER_PARSE_OPER_NEG 10 // negation +#define VER_PARSE_OPER_AND 9 // logic AND +#define VER_PARSE_OPER_XOR 8 // logic EXOR (a'b | ab') +#define VER_PARSE_OPER_OR 7 // logic OR +#define VER_PARSE_OPER_EQU 6 // equvalence (a'b'| ab ) +#define VER_PARSE_OPER_MUX 5 // MUX (a'b | ac ) +#define VER_PARSE_OPER_MARK 1 // OpStack token standing for an opening paranthesis + +// these are values of the internal Flag +#define VER_PARSE_FLAG_START 1 // after the opening parenthesis +#define VER_PARSE_FLAG_VAR 2 // after operation is received +#define VER_PARSE_FLAG_OPER 3 // after operation symbol is received +#define VER_PARSE_FLAG_OPERMUX 4 // after operation symbol is received +#define VER_PARSE_FLAG_ERROR 5 // when error is detected + +static DdNode * Ver_FormulaParserTopOper( DdManager * dd, Vec_Ptr_t * vStackFn, int Oper ); +static int Ver_FormulaParserFindVar( char * pString, Vec_Ptr_t * vNames ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Parser of the formula encountered in assign statements.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +DdNode * Ver_FormulaParser( char * pFormula, DdManager * dd, Vec_Ptr_t * vNames, Vec_Ptr_t * vStackFn, Vec_Int_t * vStackOp, char * pErrorMessage ) +{ + DdNode * bFunc, * bTemp; + char * pTemp; + int nParans, Flag; + int Oper, Oper1, Oper2; + int v; + + // clear the stacks and the names + Vec_PtrClear( vNames ); + Vec_PtrClear( vStackFn ); + Vec_IntClear( vStackOp ); + + // make sure that the number of opening and closing parantheses is the same + nParans = 0; + for ( pTemp = pFormula; *pTemp; pTemp++ ) + if ( *pTemp == '(' ) + nParans++; + else if ( *pTemp == ')' ) + nParans--; + if ( nParans != 0 ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): Different number of opening and closing parantheses ()." ); + return NULL; + } + + // add parantheses + pTemp = pFormula + strlen(pFormula) + 2; + *pTemp-- = 0; *pTemp = ')'; + while ( --pTemp != pFormula ) + *pTemp = *(pTemp - 1); + *pTemp = '('; + + // perform parsing + Flag = VER_PARSE_FLAG_START; + for ( pTemp = pFormula; *pTemp; pTemp++ ) + { + switch ( *pTemp ) + { + // skip all spaces, tabs, and end-of-lines + case ' ': + case '\t': + case '\r': + case '\n': + case '\\': // skip name opening statement + continue; + + // treat Constant 0 as a variable + case VER_PARSE_SYM_CONST0: + Vec_PtrPush( vStackFn, b0 ); Cudd_Ref( b0 ); + if ( Flag == VER_PARSE_FLAG_VAR ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): No operation symbol before constant 0." ); + Flag = VER_PARSE_FLAG_ERROR; + break; + } + Flag = VER_PARSE_FLAG_VAR; + break; + + // the same for Constant 1 + case VER_PARSE_SYM_CONST1: + Vec_PtrPush( vStackFn, b1 ); Cudd_Ref( b1 ); + if ( Flag == VER_PARSE_FLAG_VAR ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): No operation symbol before constant 1." ); + Flag = VER_PARSE_FLAG_ERROR; + break; + } + Flag = VER_PARSE_FLAG_VAR; + break; + + case VER_PARSE_SYM_NEGBEF1: + case VER_PARSE_SYM_NEGBEF2: + if ( Flag == VER_PARSE_FLAG_VAR ) + {// if NEGBEF follows a variable, AND is assumed + sprintf( pErrorMessage, "Parse_FormulaParser(): Variable before negation." ); + Flag = VER_PARSE_FLAG_ERROR; + break; + } + Vec_IntPush( vStackOp, VER_PARSE_OPER_NEG ); + break; + + case VER_PARSE_SYM_AND: + case VER_PARSE_SYM_OR: + case VER_PARSE_SYM_XOR: + case VER_PARSE_SYM_MUX1: + case VER_PARSE_SYM_MUX2: + if ( Flag != VER_PARSE_FLAG_VAR ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): There is no variable before AND, EXOR, or OR." ); + Flag = VER_PARSE_FLAG_ERROR; + break; + } + if ( *pTemp == VER_PARSE_SYM_AND ) + Vec_IntPush( vStackOp, VER_PARSE_OPER_AND ); + else if ( *pTemp == VER_PARSE_SYM_OR ) + Vec_IntPush( vStackOp, VER_PARSE_OPER_OR ); + else if ( *pTemp == VER_PARSE_SYM_XOR ) + Vec_IntPush( vStackOp, VER_PARSE_OPER_XOR ); + else if ( *pTemp == VER_PARSE_SYM_MUX1 ) + Vec_IntPush( vStackOp, VER_PARSE_OPER_MUX ); +// else if ( *pTemp == VER_PARSE_SYM_MUX2 ) +// Vec_IntPush( vStackOp, VER_PARSE_OPER_MUX ); + Flag = VER_PARSE_FLAG_OPER; + break; + + case VER_PARSE_SYM_OPEN: + if ( Flag == VER_PARSE_FLAG_VAR ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): Variable before a paranthesis." ); + Flag = VER_PARSE_FLAG_ERROR; + break; + } + Vec_IntPush( vStackOp, VER_PARSE_OPER_MARK ); + // after an opening bracket, it feels like starting over again + Flag = VER_PARSE_FLAG_START; + break; + + case VER_PARSE_SYM_CLOSE: + if ( Vec_IntSize( vStackOp ) ) + { + while ( 1 ) + { + if ( !Vec_IntSize( vStackOp ) ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): There is no opening paranthesis\n" ); + Flag = VER_PARSE_FLAG_ERROR; + break; + } + Oper = Vec_IntPop( vStackOp ); + if ( Oper == VER_PARSE_OPER_MARK ) + break; + // skip the second MUX operation +// if ( Oper == VER_PARSE_OPER_MUX2 ) +// { +// Oper = Vec_IntPop( vStackOp ); +// assert( Oper == VER_PARSE_OPER_MUX1 ); +// } + + // perform the given operation + if ( Ver_FormulaParserTopOper( dd, vStackFn, Oper ) == NULL ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): Unknown operation\n" ); + return NULL; + } + } + } + else + { + sprintf( pErrorMessage, "Parse_FormulaParser(): There is no opening paranthesis\n" ); + Flag = VER_PARSE_FLAG_ERROR; + break; + } + if ( Flag != VER_PARSE_FLAG_ERROR ) + Flag = VER_PARSE_FLAG_VAR; + break; + + + default: + // scan the next name + v = Ver_FormulaParserFindVar( pTemp, vNames ); + pTemp += (int)Vec_PtrEntry( vNames, 2*v ) - 1; + + // assume operation AND, if vars follow one another + if ( Flag == VER_PARSE_FLAG_VAR ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): Incorrect state." ); + return NULL; + } + bTemp = Cudd_bddIthVar(dd, v); + Vec_PtrPush( vStackFn, bTemp ); Cudd_Ref( bTemp ); + Flag = VER_PARSE_FLAG_VAR; + break; + } + + if ( Flag == VER_PARSE_FLAG_ERROR ) + break; // error exit + else if ( Flag == VER_PARSE_FLAG_START ) + continue; // go on parsing + else if ( Flag == VER_PARSE_FLAG_VAR ) + while ( 1 ) + { // check if there are negations in the OpStack + if ( !Vec_IntSize(vStackOp) ) + break; + Oper = Vec_IntPop( vStackOp ); + if ( Oper != VER_PARSE_OPER_NEG ) + { + Vec_IntPush( vStackOp, Oper ); + break; + } + else + { + Vec_PtrPush( vStackFn, Cudd_Not(Vec_PtrPop(vStackFn)) ); + } + } + else // if ( Flag == VER_PARSE_FLAG_OPER ) + while ( 1 ) + { // execute all the operations in the OpStack + // with precedence higher or equal than the last one + Oper1 = Vec_IntPop( vStackOp ); // the last operation + if ( !Vec_IntSize(vStackOp) ) + { // if it is the only operation, push it back + Vec_IntPush( vStackOp, Oper1 ); + break; + } + Oper2 = Vec_IntPop( vStackOp ); // the operation before the last one + if ( Oper2 >= Oper1 ) + { // if Oper2 precedence is higher or equal, execute it + if ( Ver_FormulaParserTopOper( dd, vStackFn, Oper2 ) == NULL ) + { + sprintf( pErrorMessage, "Parse_FormulaParser(): Unknown operation\n" ); + return NULL; + } + Vec_IntPush( vStackOp, Oper1 ); // push the last operation back + } + else + { // if Oper2 precedence is lower, push them back and done + Vec_IntPush( vStackOp, Oper2 ); + Vec_IntPush( vStackOp, Oper1 ); + break; + } + } + } + + if ( Flag != VER_PARSE_FLAG_ERROR ) + { + if ( Vec_PtrSize(vStackFn) ) + { + bFunc = Vec_PtrPop(vStackFn); + if ( !Vec_PtrSize(vStackFn) ) + if ( !Vec_IntSize(vStackOp) ) + { + Cudd_Deref( bFunc ); + return bFunc; + } + else + sprintf( pErrorMessage, "Parse_FormulaParser(): Something is left in the operation stack\n" ); + else + sprintf( pErrorMessage, "Parse_FormulaParser(): Something is left in the function stack\n" ); + } + else + sprintf( pErrorMessage, "Parse_FormulaParser(): The input string is empty\n" ); + } + Cudd_Ref( bFunc ); + Cudd_RecursiveDeref( dd, bFunc ); + return NULL; +} + +/**Function************************************************************* + + Synopsis [Performs the operation on the top entries in the stack.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +DdNode * Ver_FormulaParserTopOper( DdManager * dd, Vec_Ptr_t * vStackFn, int Oper ) +{ + DdNode * bArg0, * bArg1, * bArg2, * bFunc; + // perform the given operation + bArg2 = Vec_PtrPop( vStackFn ); + bArg1 = Vec_PtrPop( vStackFn ); + if ( Oper == VER_PARSE_OPER_AND ) + bFunc = Cudd_bddAnd( dd, bArg1, bArg2 ); + else if ( Oper == VER_PARSE_OPER_XOR ) + bFunc = Cudd_bddXor( dd, bArg1, bArg2 ); + else if ( Oper == VER_PARSE_OPER_OR ) + bFunc = Cudd_bddOr( dd, bArg1, bArg2 ); + else if ( Oper == VER_PARSE_OPER_EQU ) + bFunc = Cudd_bddXnor( dd, bArg1, bArg2 ); + else if ( Oper == VER_PARSE_OPER_MUX ) + { + bArg0 = Vec_PtrPop( vStackFn ); + bFunc = Cudd_bddIte( dd, bArg0, bArg1, bArg2 ); Cudd_Ref( bFunc ); + Cudd_RecursiveDeref( dd, bArg0 ); + Cudd_Deref( bFunc ); + } + else + return NULL; + Cudd_Ref( bFunc ); + Cudd_RecursiveDeref( dd, bArg1 ); + Cudd_RecursiveDeref( dd, bArg2 ); + Vec_PtrPush( vStackFn, bFunc ); + return bFunc; +} + +/**Function************************************************************* + + Synopsis [Returns the index of the new variable found.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Ver_FormulaParserFindVar( char * pString, Vec_Ptr_t * vNames ) +{ + char * pTemp, * pTemp2; + int nLength, nLength2, i; + // find the end of the string delimited by other characters + pTemp = pString; + while ( *pTemp && *pTemp != ' ' && *pTemp != '\t' && *pTemp != '\r' && *pTemp != '\n' && + *pTemp != VER_PARSE_SYM_OPEN && *pTemp != VER_PARSE_SYM_CLOSE && + *pTemp != VER_PARSE_SYM_NEGBEF1 && *pTemp != VER_PARSE_SYM_NEGBEF2 && + *pTemp != VER_PARSE_SYM_AND && *pTemp != VER_PARSE_SYM_OR && *pTemp != VER_PARSE_SYM_XOR && + *pTemp != VER_PARSE_SYM_MUX1 && *pTemp != VER_PARSE_SYM_MUX2 ) + pTemp++; + // look for this string in the array + nLength = pTemp - pString; + for ( i = 0; i < Vec_PtrSize(vNames)/2; i++ ) + { + nLength2 = (int)Vec_PtrEntry( vNames, 2*i + 0 ); + if ( nLength2 != nLength ) + continue; + pTemp2 = Vec_PtrEntry( vNames, 2*i + 1 ); + if ( strncmp( pTemp, pTemp2, nLength ) ) + continue; + return i; + } + // could not find - add and return the number + Vec_PtrPush( vNames, (void *)nLength ); + Vec_PtrPush( vNames, pString ); + return i; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + |