4.3BSD - /usr/src/new/icon/lib/create.c

   1: #include "../h/rt.h"
   2: #ifdef VAX
   3: /*
   4:  * create - return an entry block for a co-expression.
   5:  */
   6: 
   7: create(nargs, arg1)
   8: int nargs;
   9: struct descrip arg1;
  10:    {
  11:    register int *ap, *sp, *tp;
  12:    register struct descrip *dp;
  13:    register struct b_estack *ep;
  14:    register struct b_eblock *hp;
  15:    int na, nl, *r5, i, j, *newap;
  16:    extern interp();
  17:    extern struct b_estack *alcestk();
  18:    extern struct b_eblock *alceblk();
  19: 
  20:    SetBound;
  21:    if (QUAL(arg1) || TYPE(arg1) != T_INTEGER)
  22:        syserr("create: illegal entry point");
  23: 
  24:    /*
  25:     * Get a new co-expression stack and initialize activator, result
  26:     *  count, and stack base.
  27:     */
  28:    esneed();
  29:    ep = alcestk();
  30:    ep->activator = nulldesc;
  31:    ep->nresults = 0;
  32:    ep->sbase = sp = (int *)ep;
  33:    /*
  34:     * Move hardware ap of calling function into the variable ap.
  35:     */
  36:    asm(" addl3 8(fp),$4,r11");
  37:    /*
  38:     * Calculate number of arguments and number of local variables.
  39:     */
  40:    na = *ap;
  41:    tp = ap + 1 + (2 * na);
  42:    nl = ((struct descrip *)tp)->value.bptr->proc.ndynam;
  43: 
  44:    /*
  45:     * Get a new co-expression heap block.  Note that the "+ 1" in
  46:     *  na + nl + 1 is for arg0, the calling procedure.
  47:     */
  48:    hneed(sizeof(struct b_eblock) + (na + nl + 1) * sizeof(struct descrip));
  49:    hp = alceblk(INTVAL(arg1),na,nl);
  50:    ep->freshblk.type = D_EBLOCK;
  51:    BLKLOC(ep->freshblk) = (union block *) hp;
  52: 
  53:    /*
  54:     * Copy arguments into refresh block.  dp starts at arg0 and works down.
  55:     */
  56:    dp = (struct descrip *) ((int *)(ap + 1 + (2 * na)));
  57:    i = 0;
  58:    hp->elems[0] = *dp--;
  59:    j = na;
  60:    while (j-- > 0) {
  61:       hp->elems[++i] = *dp--;
  62:       }
  63: 
  64:    /*
  65:     * Copy arguments into new stack.  This is more painful than copying
  66:     *  into the refresh block because the arguments are copied a word
  67:     *  at a time.  tp starts at the high word of arg0 and goes down.
  68:     */
  69:    tp = ap + 2 + (2 * na);
  70:    *--sp = *tp--;
  71:    *--sp = *tp--;
  72:    j = na;
  73:    while (j-- > 0) {
  74:       *--sp = *tp--;
  75:       *--sp = *tp--;
  76:       }
  77: 
  78:    /*
  79:     * Set up original procedure frame in new stack.
  80:     */
  81:    *--sp = *tp--;           /* copy nargs */
  82:    *--sp = *tp;             /* copy nwords (argc) */
  83:    newap = sp;              /*  and save a pointer to it. */
  84:    *--sp = 0;               /* return pc */
  85:    *--sp = 0;               /* saved r5 (frame pointer) */
  86:    *--sp = 0;               /* saved ap */
  87:    *--sp = 0;               /* psw/reg. mask */
  88:    *--sp = 0;               /* condition handler */
  89:    r5 = sp;             /*  and save a pointer to it */
  90:    *--sp = line;            /* saved line number */
  91:    *--sp = (int) file;          /* saved file name */
  92: 
  93:    /*
  94:     * Copy local variables into new stack.  The asm sets tp to the
  95:     *  address of the start of local region in caller's procedure frame.
  96:     */
  97:    asm(" addl3 12(fp),$-12,r9");
  98:    j = nl;
  99:    while (j-- > 0) {
 100:       *--sp = *tp--;
 101:       *--sp = *tp--;
 102:      }
 103:    /*
 104:     * Copy local variables into the refresh block.  The asm sets dp to
 105:     *  the address of the first local.
 106:     */
 107:    asm(" addl3 12(fp),$-16,r8");
 108:    j = nl;
 109:    while (j-- > 0)
 110:       hp->elems[++i] = *dp--;
 111: 
 112:    /*
 113:     * Set up dummy call to coact.
 114:     */
 115:    *--sp = nulldesc.type;       /* place for result */
 116:    *--sp = INTVAL(nulldesc);
 117:    *--sp = nulldesc.type;       /* place for activate coexpr */
 118:    *--sp = INTVAL(nulldesc);
 119:    *--sp = 1;               /* nargs */
 120:    *--sp = 3;               /* 3 longwords in nargs */
 121:    tp = sp;             /* save pointer to start of arg
 122: 					    list in this frame */
 123:    *--sp = INTVAL(arg1);        /* saved r9 (coexpr entry point) */
 124:    *--sp = (int) interp;            /* return pc */
 125:    *--sp = (int) r5;                /* saved r5 */
 126:    *--sp = (int) newap;         /* saved ap */
 127:    *--sp = 0x02000000;          /* psw/reg mask with bit set to
 128: 					    restore r9, the ipc */
 129:    *--sp = 0;               /* condition handler */
 130:    ep->boundary = sp;           /*   (initial boundary) */
 131:    *--sp = line;            /* saved line number */
 132:    *--sp = (int) file;          /* saved file name */
 133:    ep->sp = sp;             /* initial stack pointer */
 134:    ep->ap = tp;             /* initial arg. pointer */
 135: 
 136:    /*
 137:     * Return the new co-expression.
 138:     */
 139:    arg1.type = D_ESTACK;
 140:    BLKLOC(arg1) = (union block *) ep;
 141:    ClearBound;
 142:    }
 143: #endif VAX
 144: #ifdef PORT
 145: create()
 146: {
 147:    syserr("Attempt to create a co-expression");
 148: }
 149: #endif PORT
 150: 
 151: #ifdef PDP11
 152: /*
 153:  * create - return an entry block for a co-expression
 154:  *
 155:  * NOTE:  this code is highly dependent on stack frame layout.
 156:  */
 157: 
 158: create(nargs, arg1)
 159: int nargs;
 160: struct descrip arg1;
 161:    {
 162:    register int *ap, *sp;
 163:    register struct b_estack *ep;
 164:    register struct b_eblock *hp;
 165:    int na, nl, *r5, i;
 166:    extern interp();
 167:    extern struct b_estack *alcestk();
 168:    extern struct b_eblock *alceblk();
 169: 
 170:    if (QUAL(arg1) || TYPE(arg1) != T_INTEGER)
 171:        syserr("create: illegal entry point");
 172: 
 173:    esneed();                            /* check for room in stack space */
 174:    ep = alcestk();                      /* allocate expression stack */
 175:    ep->activator = nulldesc;
 176:    ep->nresults = 0;
 177: 
 178:    ep->sbase = sp = (int *)ep;      /* initialize new stack pointer */
 179:    ap = (int *)*(&nargs-2) + 2;     /* find nargs of caller */
 180:    na = *ap;                    /* get value of nargs */
 181:    ap += 1 + 2 * na;            /* find arg0 of caller */
 182:    nl = ((struct descrip *)ap)->value.bptr->proc.ndynam; /* get # locals */
 183: 
 184:    hneed(sizeof(struct b_eblock) + (na + nl + 1) * sizeof(struct descrip));
 185:    hp = alceblk(INTVAL(arg1),na,nl);    /* allocate refresh block */
 186:    ep->freshblk.type = D_EBLOCK;
 187:    BLKLOC(ep->freshblk) = (union block *) hp;
 188: 
 189:    /* copy arguments into new stack and refresh block */
 190:    i = 0;
 191:    hp->elems[i] = *--(struct descrip *)sp = *(struct descrip *)ap;
 192:    while (na-- > 0)
 193:       hp->elems[++i] = *--(struct descrip *)sp = *--(struct descrip *)ap;
 194: 
 195:    /* set up original procedure frame in new stack */
 196:    *--sp = *--ap;           /* copy nargs */
 197:    *--sp = 0;               /* return pc */
 198:    *--sp = 0;               /* saved r5 */
 199:    r5 = sp;             /*   (save its address) */
 200:    *--sp = 0;               /* saved r4 */
 201:    *--sp = 0;               /* saved r3 */
 202:    *--sp = 0;               /* saved r2 */
 203:    *--sp = line;            /* saved line number */
 204:    *--sp = (int) file;          /* saved file name */
 205: 
 206:    /* copy local variables into new stack */
 207:    ap -= 7;
 208:    while (nl-- > 0)
 209:       hp->elems[++i] = *--(struct descrip *)sp = *--(struct descrip *)ap;
 210: 
 211:    /* set up dummy call to coact */
 212:    *--(struct descrip *)sp = nulldesc;  /* place for result */
 213:    *--(struct descrip *)sp = nulldesc;  /* place for activate coexpr */
 214:    /* these values are the initial register state for the co-expression */
 215:    *--sp = 1;               /* nargs */
 216:    *--sp = (int) interp;            /* return pc */
 217:    *--sp = (int) r5;                /* saved r5 */
 218:    ep->boundary = sp;           /*   (initial boundary) */
 219:    *--sp = 0;               /* saved r4 */
 220:    *--sp = 0;               /* saved r3 */
 221:    *--sp = INTVAL(arg1);        /* saved r2 (coexpr entry point) */
 222:    *--sp = line;            /* saved line number */
 223:    *--sp = (int) file;          /* saved file name */
 224:    ep->sp = sp;             /* initial stack pointer */
 225:    arg1.type = D_ESTACK;
 226:    BLKLOC(arg1) = (union block *) ep;
 227:    }
 228: #endif PDP11

Defined functions