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put.c

/****************************************************************
Copyright 1990-1991, 1993-1994, 1996, 2000-2001 by AT&T, Lucent Technologies and Bellcore.

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and its documentation for any purpose and without fee is hereby
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this software, including all implied warranties of
merchantability and fitness.  In no event shall AT&T, Lucent or
Bellcore be liable for any special, indirect or consequential
damages or any damages whatsoever resulting from loss of use,
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****************************************************************/

/*
 * INTERMEDIATE CODE GENERATION PROCEDURES COMMON TO BOTH
 * JOHNSON (PORTABLE) AND RITCHIE FAMILIES OF SECOND PASSES
*/

#include "defs.h"
#include "names.h"            /* For LOCAL_CONST_NAME */
#include "pccdefs.h"
#include "p1defs.h"

/* Definitions for   putconst()   */

#define LIT_CHAR 1
#define LIT_FLOAT 2
#define LIT_INT 3
#define LIT_INTQ 4


/*
char *ops [ ] =
      {
      "??", "+", "-", "*", "/", "**", "-",
      "OR", "AND", "EQV", "NEQV", "NOT",
      "CONCAT",
      "<", "==", ">", "<=", "!=", ">=",
      " of ", " ofC ", " = ", " += ", " *= ", " CONV ", " << ", " % ",
      " , ", " ? ", " : "
      " abs ", " min ", " max ", " addr ", " indirect ",
      " bitor ", " bitand ", " bitxor ", " bitnot ", " >> ",
      };
*/

/* Each of these values is defined in   pccdefs   */

int ops2 [ ] =
{
      P2BAD, P2PLUS, P2MINUS, P2STAR, P2SLASH, P2BAD, P2NEG,
      P2OROR, P2ANDAND, P2EQ, P2NE, P2NOT,
      P2BAD,
      P2LT, P2EQ, P2GT, P2LE, P2NE, P2GE,
      P2CALL, P2CALL, P2ASSIGN, P2PLUSEQ, P2STAREQ, P2CONV, P2LSHIFT, P2MOD,
      P2COMOP, P2QUEST, P2COLON,
      1, P2BAD, P2BAD, P2BAD, P2BAD,
      P2BITOR, P2BITAND, P2BITXOR, P2BITNOT, P2RSHIFT,
      P2BAD, P2BAD, P2BAD, P2BAD, P2BAD, P2BAD, P2BAD, P2BAD, P2BAD,
      P2BAD, P2BAD, P2BAD, P2BAD,
      1,1,1,1,1, /* OPNEG1, OPDMIN, OPDMAX, OPASSIGNI, OPIDENTITY */
      1,1,1,1,   /* OPCHARCAST, OPDABS, OPMIN2, OPMAX2 */
      1,1,1,1,1  /* OPBITTEST, OPBITCLR, OPBITSET, OPQBIT{CLR,SET} */
};


 void
#ifdef KR_headers
putexpr(p)
      expptr p;
#else
putexpr(expptr p)
#endif
{
/* Write the expression to the p1 file */

      p = (expptr) putx (fixtype (p));
      p1_expr (p);
}





 expptr
#ifdef KR_headers
putassign(lp, rp)
      expptr lp;
      expptr rp;
#else
putassign(expptr lp, expptr rp)
#endif
{
      return putx(fixexpr((Exprp)mkexpr(OPASSIGN, lp, rp)));
}




 void
#ifdef KR_headers
puteq(lp, rp)
      expptr lp;
      expptr rp;
#else
puteq(expptr lp, expptr rp)
#endif
{
      putexpr(mkexpr(OPASSIGN, lp, rp) );
}




/* put code for  a *= b */

 expptr
#ifdef KR_headers
putsteq(a, b)
      Addrp a;
      Addrp b;
#else
putsteq(Addrp a, Addrp b)
#endif
{
      return putx( fixexpr((Exprp)
            mkexpr(OPSTAREQ, cpexpr((expptr)a), cpexpr((expptr)b))));
}




 Addrp
#ifdef KR_headers
mkfield(res, f, ty)
      register Addrp res;
      char *f;
      int ty;
#else
mkfield(register Addrp res, char *f, int ty)
#endif
{
    res -> vtype = ty;
    res -> Field = f;
    return res;
} /* mkfield */


 Addrp
#ifdef KR_headers
realpart(p)
      register Addrp p;
#else
realpart(register Addrp p)
#endif
{
      register Addrp q;

      if (p->tag == TADDR
       && p->uname_tag == UNAM_CONST
       && ISCOMPLEX (p->vtype))
            return (Addrp)mkrealcon (p -> vtype + TYREAL - TYCOMPLEX,
                  p->user.kludge.vstg1 ? p->user.Const.cds[0]
                        : cds(dtos(p->user.Const.cd[0]),CNULL));

      q = (Addrp) cpexpr((expptr) p);
      if( ISCOMPLEX(p->vtype) )
            q = mkfield (q, "r", p -> vtype + TYREAL - TYCOMPLEX);

      return(q);
}




 expptr
#ifdef KR_headers
imagpart(p)
      register Addrp p;
#else
imagpart(register Addrp p)
#endif
{
      register Addrp q;

      if( ISCOMPLEX(p->vtype) )
      {
            if (p->tag == TADDR && p->uname_tag == UNAM_CONST)
                  return mkrealcon (p -> vtype + TYREAL - TYCOMPLEX,
                        p->user.kludge.vstg1 ? p->user.Const.cds[1]
                        : cds(dtos(p->user.Const.cd[1]),CNULL));
            q = (Addrp) cpexpr((expptr) p);
            q = mkfield (q, "i", p -> vtype + TYREAL - TYCOMPLEX);
            return( (expptr) q );
      }
      else

/* Cast an integer type onto a Double Real type */

            return( mkrealcon( ISINT(p->vtype) ? TYDREAL : p->vtype , "0"));
}





/* ncat -- computes the number of adjacent concatenation operations */

 int
#ifdef KR_headers
ncat(p)
      register expptr p;
#else
ncat(register expptr p)
#endif
{
      if(p->tag==TEXPR && p->exprblock.opcode==OPCONCAT)
            return( ncat(p->exprblock.leftp) + ncat(p->exprblock.rightp) );
      else  return(1);
}




/* lencat -- returns the length of the concatenated string.  Each
   substring must have a static (i.e. compile-time) fixed length */

 ftnint
#ifdef KR_headers
lencat(p)
      register expptr p;
#else
lencat(register expptr p)
#endif
{
      if(p->tag==TEXPR && p->exprblock.opcode==OPCONCAT)
            return( lencat(p->exprblock.leftp) + lencat(p->exprblock.rightp) );
      else if( p->headblock.vleng!=NULL && ISICON(p->headblock.vleng) )
            return(p->headblock.vleng->constblock.Const.ci);
      else if(p->tag==TADDR && p->addrblock.varleng!=0)
            return(p->addrblock.varleng);
      else
      {
            err("impossible element in concatenation");
            return(0);
      }
}

/* putconst -- Creates a new Addrp value which maps onto the input
   constant value.  The Addrp doesn't retain the value of the constant,
   instead that value is copied into a table of constants (called
   litpool,   for pool of literal values).  The only way to retrieve the
   actual value of the constant is to look at the   memno   field of the
   Addrp result.  You know that the associated literal is the one referred
   to by   q   when   (q -> memno == litp -> litnum).
*/

 Addrp
#ifdef KR_headers
putconst(p)
      register Constp p;
#else
putconst(register Constp p)
#endif
{
      register Addrp q;
      struct Literal *litp, *lastlit;
      int k, len, type;
      int litflavor;
      double cd[2];
      ftnint nblanks;
      char *strp;
      char cdsbuf0[64], cdsbuf1[64], *ds[2];

      if (p->tag != TCONST)
            badtag("putconst", p->tag);

      q = ALLOC(Addrblock);
      q->tag = TADDR;
      type = p->vtype;
      q->vtype = ( type==TYADDR ? tyint : type );
      q->vleng = (expptr) cpexpr(p->vleng);
      q->vstg = STGCONST;

/* Create the new label for the constant.  This is wasteful of labels
   because when the constant value already exists in the literal pool,
   this label gets thrown away and is never reclaimed.  It might be
   cleaner to move this down past the first   switch()   statement below */

      q->memno = newlabel();
      q->memoffset = ICON(0);
      q -> uname_tag = UNAM_CONST;

/* Copy the constant info into the Addrblock; do this by copying the
   largest storage elts */

      q -> user.Const = p -> Const;
      q->user.kludge.vstg1 = p->vstg;     /* distinguish string from binary fp */

      /* check for value in literal pool, and update pool if necessary */

      k = 1;
      switch(type)
      {
      case TYCHAR:
            if (halign) {
                  strp = p->Const.ccp;
                  nblanks = p->Const.ccp1.blanks;
                  len = (int)p->vleng->constblock.Const.ci;
                  litflavor = LIT_CHAR;
                  goto loop;
                  }
            else
                  q->memno = BAD_MEMNO;
            break;
      case TYCOMPLEX:
      case TYDCOMPLEX:
            k = 2;
            if (p->vstg)
                  cd[1] = atof(ds[1] = p->Const.cds[1]);
            else
                  ds[1] = cds(dtos(cd[1] = p->Const.cd[1]), cdsbuf1);
      case TYREAL:
      case TYDREAL:
            litflavor = LIT_FLOAT;
            if (p->vstg)
                  cd[0] = atof(ds[0] = p->Const.cds[0]);
            else
                  ds[0] = cds(dtos(cd[0] = p->Const.cd[0]), cdsbuf0);
            goto loop;

#ifndef NO_LONG_LONG
      case TYQUAD:
            litflavor = LIT_INTQ;
            goto loop;
#endif

      case TYLOGICAL1:
      case TYLOGICAL2:
      case TYLOGICAL:
      case TYLONG:
      case TYSHORT:
      case TYINT1:
#ifdef TYQUAD0
      case TYQUAD:
#endif
            litflavor = LIT_INT;

/* Scan the literal pool for this constant value.  If this same constant
   has been assigned before, use the same label.  Note that this routine
   does NOT consider two differently-typed constants with the same bit
   pattern to be the same constant */

 loop:
            lastlit = litpool + nliterals;
            for(litp = litpool ; litp<lastlit ; ++litp)

/* Remove this type checking to ensure that all bit patterns are reused */

                  if(type == litp->littype) switch(litflavor)
                  {
                  case LIT_CHAR:
                        if (len == (int)litp->litval.litival2[0]
                        && nblanks == litp->litval.litival2[1]
                        && !memcmp(strp, litp->cds[0], len)) {
                              q->memno = litp->litnum;
                              frexpr((expptr)p);
                              q->user.Const.ccp1.ccp0 = litp->cds[0];
                              return(q);
                              }
                        break;
                  case LIT_FLOAT:
                        if(cd[0] == litp->litval.litdval[0]
                        && !strcmp(ds[0], litp->cds[0])
                        && (k == 1 ||
                            cd[1] == litp->litval.litdval[1]
                            && !strcmp(ds[1], litp->cds[1]))) {
ret:
                              q->memno = litp->litnum;
                              frexpr((expptr)p);
                              return(q);
                              }
                        break;

                  case LIT_INT:
                        if(p->Const.ci == litp->litval.litival)
                              goto ret;
                        break;
#ifndef NO_LONG_LONG
                  case LIT_INTQ:
                        if(p->Const.cq == litp->litval.litqval)
                              goto ret;
                        break;
#endif
                  }

/* If there's room in the literal pool, add this new value to the pool */

            if(nliterals < maxliterals)
            {
                  ++nliterals;

                  /* litp   now points to the next free elt */

                  litp->littype = type;
                  litp->litnum = q->memno;
                  switch(litflavor)
                  {
                  case LIT_CHAR:
                        litp->litval.litival2[0] = len;
                        litp->litval.litival2[1] = nblanks;
                        q->user.Const.ccp = litp->cds[0] = (char*)
                              memcpy(gmem(len,0), strp, len);
                        break;

                  case LIT_FLOAT:
                        litp->litval.litdval[0] = cd[0];
                        litp->cds[0] = copys(ds[0]);
                        if (k == 2) {
                              litp->litval.litdval[1] = cd[1];
                              litp->cds[1] = copys(ds[1]);
                              }
                        break;

                  case LIT_INT:
                        litp->litval.litival = p->Const.ci;
                        break;
#ifndef NO_LONG_LONG
                  case LIT_INTQ:
                        litp->litval.litqval = p->Const.cq;
                        break;
#endif
                  } /* switch (litflavor) */
            }
            else
                  many("literal constants", 'L', maxliterals);

            break;
      case TYADDR:
          break;
      default:
            badtype ("putconst", p -> vtype);
            break;
      } /* switch */

      if (type != TYCHAR || halign)
          frexpr((expptr)p);
      return( q );
}

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