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|
/**CFile****************************************************************
FileName [ioWriteVerilog.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Command processing package.]
Synopsis [Procedures to output a special subset of Verilog.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: ioWriteVerilog.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "ioAbc.h"
#include "base/main/main.h"
#include "map/mio/mio.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void Io_WriteVerilogInt( FILE * pFile, Abc_Ntk_t * pNtk );
static void Io_WriteVerilogPis( FILE * pFile, Abc_Ntk_t * pNtk, int Start );
static void Io_WriteVerilogPos( FILE * pFile, Abc_Ntk_t * pNtk, int Start );
static void Io_WriteVerilogWires( FILE * pFile, Abc_Ntk_t * pNtk, int Start );
static void Io_WriteVerilogRegs( FILE * pFile, Abc_Ntk_t * pNtk, int Start );
static void Io_WriteVerilogLatches( FILE * pFile, Abc_Ntk_t * pNtk );
static void Io_WriteVerilogObjects( FILE * pFile, Abc_Ntk_t * pNtk );
static int Io_WriteVerilogWiresCount( Abc_Ntk_t * pNtk );
static char * Io_WriteVerilogGetName( char * pName );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Write verilog.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilog( Abc_Ntk_t * pNtk, char * pFileName )
{
Abc_Ntk_t * pNetlist;
FILE * pFile;
int i;
// can only write nodes represented using local AIGs
if ( !Abc_NtkIsAigNetlist(pNtk) && !Abc_NtkIsMappedNetlist(pNtk) )
{
printf( "Io_WriteVerilog(): Can produce Verilog for mapped or AIG netlists only.\n" );
return;
}
// start the output stream
pFile = fopen( pFileName, "w" );
if ( pFile == NULL )
{
fprintf( stdout, "Io_WriteVerilog(): Cannot open the output file \"%s\".\n", pFileName );
return;
}
// write the equations for the network
fprintf( pFile, "// Benchmark \"%s\" written by ABC on %s\n", pNtk->pName, Extra_TimeStamp() );
fprintf( pFile, "\n" );
// write modules
if ( pNtk->pDesign )
{
// write the network first
Io_WriteVerilogInt( pFile, pNtk );
// write other things
Vec_PtrForEachEntry( Abc_Ntk_t *, pNtk->pDesign->vModules, pNetlist, i )
{
assert( Abc_NtkIsNetlist(pNetlist) );
if ( pNetlist == pNtk )
continue;
fprintf( pFile, "\n" );
Io_WriteVerilogInt( pFile, pNetlist );
}
}
else
{
Io_WriteVerilogInt( pFile, pNtk );
}
fprintf( pFile, "\n" );
fclose( pFile );
}
/**Function*************************************************************
Synopsis [Writes verilog.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogInt( FILE * pFile, Abc_Ntk_t * pNtk )
{
// write inputs and outputs
// fprintf( pFile, "module %s ( gclk,\n ", Abc_NtkName(pNtk) );
fprintf( pFile, "module %s ( ", Io_WriteVerilogGetName(Abc_NtkName(pNtk)) );
// add the clock signal if it does not exist
if ( Abc_NtkLatchNum(pNtk) > 0 && Nm_ManFindIdByName(pNtk->pManName, "clock", ABC_OBJ_PI) == -1 )
fprintf( pFile, "clock, " );
// write other primary inputs
fprintf( pFile, "\n " );
if ( Abc_NtkPiNum(pNtk) > 0 )
{
Io_WriteVerilogPis( pFile, pNtk, 3 );
fprintf( pFile, ",\n " );
}
if ( Abc_NtkPoNum(pNtk) > 0 )
Io_WriteVerilogPos( pFile, pNtk, 3 );
fprintf( pFile, " );\n" );
// add the clock signal if it does not exist
if ( Abc_NtkLatchNum(pNtk) > 0 && Nm_ManFindIdByName(pNtk->pManName, "clock", ABC_OBJ_PI) == -1 )
fprintf( pFile, " input clock;\n" );
// write inputs, outputs, registers, and wires
if ( Abc_NtkPiNum(pNtk) > 0 )
{
// fprintf( pFile, " input gclk," );
fprintf( pFile, " input " );
Io_WriteVerilogPis( pFile, pNtk, 10 );
fprintf( pFile, ";\n" );
}
if ( Abc_NtkPoNum(pNtk) > 0 )
{
fprintf( pFile, " output" );
Io_WriteVerilogPos( pFile, pNtk, 5 );
fprintf( pFile, ";\n" );
}
// if this is not a blackbox, write internal signals
if ( !Abc_NtkHasBlackbox(pNtk) )
{
if ( Abc_NtkLatchNum(pNtk) > 0 )
{
fprintf( pFile, " reg" );
Io_WriteVerilogRegs( pFile, pNtk, 4 );
fprintf( pFile, ";\n" );
}
if ( Io_WriteVerilogWiresCount(pNtk) > 0 )
{
fprintf( pFile, " wire" );
Io_WriteVerilogWires( pFile, pNtk, 4 );
fprintf( pFile, ";\n" );
}
// write nodes
Io_WriteVerilogObjects( pFile, pNtk );
// write registers
if ( Abc_NtkLatchNum(pNtk) > 0 )
Io_WriteVerilogLatches( pFile, pNtk );
}
// finalize the file
fprintf( pFile, "endmodule\n\n" );
}
/**Function*************************************************************
Synopsis [Writes the primary inputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogPis( FILE * pFile, Abc_Ntk_t * pNtk, int Start )
{
Abc_Obj_t * pTerm, * pNet;
int LineLength;
int AddedLength;
int NameCounter;
int i;
LineLength = Start;
NameCounter = 0;
Abc_NtkForEachPi( pNtk, pTerm, i )
{
pNet = Abc_ObjFanout0(pTerm);
// get the line length after this name is written
AddedLength = strlen(Io_WriteVerilogGetName(Abc_ObjName(pNet))) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Io_WriteVerilogGetName(Abc_ObjName(pNet)), (i==Abc_NtkPiNum(pNtk)-1)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
}
/**Function*************************************************************
Synopsis [Writes the primary outputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogPos( FILE * pFile, Abc_Ntk_t * pNtk, int Start )
{
Abc_Obj_t * pTerm, * pNet, * pSkip;
int LineLength;
int AddedLength;
int NameCounter;
int i;
int nskip;
pSkip = 0;
nskip = 0;
LineLength = Start;
NameCounter = 0;
Abc_NtkForEachPo( pNtk, pTerm, i )
{
pNet = Abc_ObjFanin0(pTerm);
if ( Abc_ObjIsPi(Abc_ObjFanin0(pNet)) )
{
// Skip this output since it is a feedthrough -- the same
// name will appear as an input and an output which other
// tools reading verilog do not like.
nskip++;
pSkip = pNet; // save an example of skipped net
continue;
}
// get the line length after this name is written
AddedLength = strlen(Io_WriteVerilogGetName(Abc_ObjName(pNet))) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Io_WriteVerilogGetName(Abc_ObjName(pNet)), (i==Abc_NtkPoNum(pNtk)-1)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
if (nskip != 0)
{
assert (pSkip);
printf( "Io_WriteVerilogPos(): Omitted %d feedthrough nets from output list of module (e.g. %s).\n", nskip, Abc_ObjName(pSkip) );
return;
}
}
/**Function*************************************************************
Synopsis [Writes the wires.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogWires( FILE * pFile, Abc_Ntk_t * pNtk, int Start )
{
Abc_Obj_t * pObj, * pNet, * pBox, * pTerm;
int LineLength;
int AddedLength;
int NameCounter;
int i, k, Counter, nNodes;
// count the number of wires
nNodes = Io_WriteVerilogWiresCount( pNtk );
// write the wires
Counter = 0;
LineLength = Start;
NameCounter = 0;
Abc_NtkForEachNode( pNtk, pObj, i )
{
if ( i == 0 )
continue;
pNet = Abc_ObjFanout0(pObj);
if ( Abc_ObjFanoutNum(pNet) > 0 && Abc_ObjIsCo(Abc_ObjFanout0(pNet)) )
continue;
Counter++;
// get the line length after this name is written
AddedLength = strlen(Io_WriteVerilogGetName(Abc_ObjName(pNet))) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Io_WriteVerilogGetName(Abc_ObjName(pNet)), (Counter==nNodes)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
Abc_NtkForEachLatch( pNtk, pObj, i )
{
pNet = Abc_ObjFanin0(Abc_ObjFanin0(pObj));
Counter++;
// get the line length after this name is written
AddedLength = strlen(Io_WriteVerilogGetName(Abc_ObjName(pNet))) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Io_WriteVerilogGetName(Abc_ObjName(pNet)), (Counter==nNodes)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
Abc_NtkForEachBox( pNtk, pBox, i )
{
if ( Abc_ObjIsLatch(pBox) )
continue;
Abc_ObjForEachFanin( pBox, pTerm, k )
{
pNet = Abc_ObjFanin0(pTerm);
Counter++;
// get the line length after this name is written
AddedLength = strlen(Io_WriteVerilogGetName(Abc_ObjName(pNet))) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Io_WriteVerilogGetName(Abc_ObjName(pNet)), (Counter==nNodes)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
Abc_ObjForEachFanout( pBox, pTerm, k )
{
pNet = Abc_ObjFanout0(pTerm);
if ( Abc_ObjFanoutNum(pNet) > 0 && Abc_ObjIsCo(Abc_ObjFanout0(pNet)) )
continue;
Counter++;
// get the line length after this name is written
AddedLength = strlen(Io_WriteVerilogGetName(Abc_ObjName(pNet))) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Io_WriteVerilogGetName(Abc_ObjName(pNet)), (Counter==nNodes)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
}
assert( Counter == nNodes );
}
/**Function*************************************************************
Synopsis [Writes the regs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogRegs( FILE * pFile, Abc_Ntk_t * pNtk, int Start )
{
Abc_Obj_t * pLatch, * pNet;
int LineLength;
int AddedLength;
int NameCounter;
int i, Counter, nNodes;
// count the number of latches
nNodes = Abc_NtkLatchNum(pNtk);
// write the wires
Counter = 0;
LineLength = Start;
NameCounter = 0;
Abc_NtkForEachLatch( pNtk, pLatch, i )
{
pNet = Abc_ObjFanout0(Abc_ObjFanout0(pLatch));
Counter++;
// get the line length after this name is written
AddedLength = strlen(Io_WriteVerilogGetName(Abc_ObjName(pNet))) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Io_WriteVerilogGetName(Abc_ObjName(pNet)), (Counter==nNodes)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
}
/**Function*************************************************************
Synopsis [Writes the latches.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogLatches( FILE * pFile, Abc_Ntk_t * pNtk )
{
Abc_Obj_t * pLatch;
int i;
if ( Abc_NtkLatchNum(pNtk) == 0 )
return;
// write the latches
// fprintf( pFile, " always @(posedge %s) begin\n", Io_WriteVerilogGetName(Abc_ObjFanout0(Abc_NtkPi(pNtk,0))) );
// fprintf( pFile, " always begin\n" );
fprintf( pFile, " always @ (posedge clock) begin\n" );
Abc_NtkForEachLatch( pNtk, pLatch, i )
{
fprintf( pFile, " %s", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(Abc_ObjFanout0(pLatch)))) );
fprintf( pFile, " <= %s;\n", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanin0(Abc_ObjFanin0(pLatch)))) );
}
fprintf( pFile, " end\n" );
// check if there are initial values
Abc_NtkForEachLatch( pNtk, pLatch, i )
if ( Abc_LatchInit(pLatch) == ABC_INIT_ZERO || Abc_LatchInit(pLatch) == ABC_INIT_ONE )
break;
if ( i == Abc_NtkLatchNum(pNtk) )
return;
// write the initial values
fprintf( pFile, " initial begin\n" );
Abc_NtkForEachLatch( pNtk, pLatch, i )
{
if ( Abc_LatchInit(pLatch) == ABC_INIT_ZERO )
fprintf( pFile, " %s <= 1\'b0;\n", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(Abc_ObjFanout0(pLatch)))) );
else if ( Abc_LatchInit(pLatch) == ABC_INIT_ONE )
fprintf( pFile, " %s <= 1\'b1;\n", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(Abc_ObjFanout0(pLatch)))) );
}
fprintf( pFile, " end\n" );
}
/**Function*************************************************************
Synopsis [Writes the nodes and boxes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogObjects( FILE * pFile, Abc_Ntk_t * pNtk )
{
int fUseSimpleGateNames = 0;
Vec_Vec_t * vLevels;
Abc_Ntk_t * pNtkBox;
Abc_Obj_t * pObj, * pTerm, * pFanin;
Hop_Obj_t * pFunc;
int i, k, Counter, nDigits, Length;
// write boxes
nDigits = Abc_Base10Log( Abc_NtkBoxNum(pNtk)-Abc_NtkLatchNum(pNtk) );
Counter = 0;
Abc_NtkForEachBox( pNtk, pObj, i )
{
if ( Abc_ObjIsLatch(pObj) )
continue;
pNtkBox = (Abc_Ntk_t *)pObj->pData;
fprintf( pFile, " %s box%0*d", pNtkBox->pName, nDigits, Counter++ );
fprintf( pFile, "(" );
Abc_NtkForEachPi( pNtkBox, pTerm, k )
{
fprintf( pFile, ".%s", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(pTerm))) );
fprintf( pFile, "(%s), ", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanin0(Abc_ObjFanin(pObj,k)))) );
}
Abc_NtkForEachPo( pNtkBox, pTerm, k )
{
fprintf( pFile, ".%s", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanin0(pTerm))) );
fprintf( pFile, "(%s)%s", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(Abc_ObjFanout(pObj,k)))), k==Abc_NtkPoNum(pNtkBox)-1? "":", " );
}
fprintf( pFile, ");\n" );
}
// write nodes
if ( Abc_NtkHasMapping(pNtk) )
{
Length = Mio_LibraryReadGateNameMax((Mio_Library_t *)pNtk->pManFunc);
nDigits = Abc_Base10Log( Abc_NtkNodeNum(pNtk) );
Counter = 0;
Abc_NtkForEachNode( pNtk, pObj, k )
{
Mio_Gate_t * pGate = (Mio_Gate_t *)pObj->pData;
Mio_Pin_t * pGatePin;
if ( Abc_ObjFaninNum(pObj) == 0 && (!strcmp(Mio_GateReadName(pGate), "_const0_") || !strcmp(Mio_GateReadName(pGate), "_const1_")) )
{
fprintf( pFile, " %-*s %s = 1\'b%d;\n", Length, "assign", Io_WriteVerilogGetName(Abc_ObjName( Abc_ObjFanout0(pObj) )), !strcmp(Mio_GateReadName(pGate), "_const1_") );
continue;
}
// write the node
if ( fUseSimpleGateNames )
{
fprintf( pFile, "%-*s ", Length, Mio_GateReadName(pGate) );
fprintf( pFile, "( %s", Io_WriteVerilogGetName(Abc_ObjName( Abc_ObjFanout0(pObj) )) );
for ( pGatePin = Mio_GateReadPins(pGate), i = 0; pGatePin; pGatePin = Mio_PinReadNext(pGatePin), i++ )
fprintf( pFile, ", %s", Io_WriteVerilogGetName(Abc_ObjName( Abc_ObjFanin(pObj,i) )) );
assert ( i == Abc_ObjFaninNum(pObj) );
fprintf( pFile, " );\n" );
}
else
{
fprintf( pFile, " %-*s g%0*d", Length, Mio_GateReadName(pGate), nDigits, Counter++ );
fprintf( pFile, "(" );
for ( pGatePin = Mio_GateReadPins(pGate), i = 0; pGatePin; pGatePin = Mio_PinReadNext(pGatePin), i++ )
{
fprintf( pFile, ".%s", Io_WriteVerilogGetName(Mio_PinReadName(pGatePin)) );
fprintf( pFile, "(%s), ", Io_WriteVerilogGetName(Abc_ObjName( Abc_ObjFanin(pObj,i) )) );
}
assert ( i == Abc_ObjFaninNum(pObj) );
fprintf( pFile, ".%s", Io_WriteVerilogGetName(Mio_GateReadOutName(pGate)) );
fprintf( pFile, "(%s)", Io_WriteVerilogGetName(Abc_ObjName( Abc_ObjFanout0(pObj) )) );
fprintf( pFile, ");\n" );
}
}
}
else
{
vLevels = Vec_VecAlloc( 10 );
Abc_NtkForEachNode( pNtk, pObj, i )
{
pFunc = (Hop_Obj_t *)pObj->pData;
fprintf( pFile, " assign %s = ", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(pObj))) );
// set the input names
Abc_ObjForEachFanin( pObj, pFanin, k )
Hop_IthVar((Hop_Man_t *)pNtk->pManFunc, k)->pData = Extra_UtilStrsav(Io_WriteVerilogGetName(Abc_ObjName(pFanin)));
// write the formula
Hop_ObjPrintVerilog( pFile, pFunc, vLevels, 0 );
fprintf( pFile, ";\n" );
// clear the input names
Abc_ObjForEachFanin( pObj, pFanin, k )
ABC_FREE( Hop_IthVar((Hop_Man_t *)pNtk->pManFunc, k)->pData );
}
Vec_VecFree( vLevels );
}
}
/**Function*************************************************************
Synopsis [Counts the number of wires.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Io_WriteVerilogWiresCount( Abc_Ntk_t * pNtk )
{
Abc_Obj_t * pObj, * pNet, * pBox;
int i, k, nWires;
nWires = Abc_NtkLatchNum(pNtk);
Abc_NtkForEachNode( pNtk, pObj, i )
{
if ( i == 0 )
continue;
pNet = Abc_ObjFanout0(pObj);
if ( Abc_ObjFanoutNum(pNet) > 0 && Abc_ObjIsCo(Abc_ObjFanout0(pNet)) )
continue;
nWires++;
}
Abc_NtkForEachBox( pNtk, pBox, i )
{
if ( Abc_ObjIsLatch(pBox) )
continue;
nWires += Abc_ObjFaninNum(pBox);
Abc_ObjForEachFanout( pBox, pObj, k )
{
pNet = Abc_ObjFanout0(pObj);
if ( Abc_ObjFanoutNum(pNet) > 0 && Abc_ObjIsCo(Abc_ObjFanout0(pNet)) )
continue;
nWires++;
}
}
return nWires;
}
/**Function*************************************************************
Synopsis [Prepares the name for writing the Verilog file.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
char * Io_WriteVerilogGetName( char * pName )
{
static char Buffer[500];
int Length, i;
Length = strlen(pName);
// consider the case of a signal having name "0" or "1"
if ( !(Length == 1 && (pName[0] == '0' || pName[0] == '1')) )
{
for ( i = 0; i < Length; i++ )
if ( !((pName[i] >= 'a' && pName[i] <= 'z') ||
(pName[i] >= 'A' && pName[i] <= 'Z') ||
(pName[i] >= '0' && pName[i] <= '9') || pName[i] == '_') )
break;
if ( i == Length )
return pName;
}
// create Verilog style name
Buffer[0] = '\\';
for ( i = 0; i < Length; i++ )
Buffer[i+1] = pName[i];
Buffer[Length+1] = ' ';
Buffer[Length+2] = 0;
return Buffer;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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