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504 lines
11 KiB
C
504 lines
11 KiB
C
/****************************************************************
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Copyright 1990, 1992, 1993 by AT&T Bell Laboratories and Bellcore.
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the names of AT&T Bell Laboratories or
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Bellcore or any of their entities not be used in advertising or
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publicity pertaining to distribution of the software without
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specific, written prior permission.
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AT&T and Bellcore disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall AT&T or Bellcore be liable for
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any special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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****************************************************************/
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#include "defs.h"
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#include "pccdefs.h"
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#include "output.h"
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int regnum[] = {
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11, 10, 9, 8, 7, 6 };
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/* Put out a constant integer */
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prconi(fp, n)
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FILEP fp;
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ftnint n;
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{
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fprintf(fp, "\t%ld\n", n);
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}
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/* Put out a constant address */
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prcona(fp, a)
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FILEP fp;
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ftnint a;
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{
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fprintf(fp, "\tL%ld\n", a);
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}
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prconr(fp, x, k)
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FILEP fp;
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int k;
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Constp x;
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{
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char *x0, *x1;
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char cdsbuf0[64], cdsbuf1[64];
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if (k > 1) {
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if (x->vstg) {
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x0 = x->Const.cds[0];
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x1 = x->Const.cds[1];
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}
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else {
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x0 = cds(dtos(x->Const.cd[0]), cdsbuf0);
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x1 = cds(dtos(x->Const.cd[1]), cdsbuf1);
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}
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fprintf(fp, "\t%s %s\n", x0, x1);
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}
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else
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fprintf(fp, "\t%s\n", x->vstg ? x->Const.cds[0]
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: cds(dtos(x->Const.cd[0]), cdsbuf0));
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}
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char *memname(stg, mem)
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int stg;
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long mem;
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{
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static char s[20];
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switch(stg)
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{
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case STGCOMMON:
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case STGEXT:
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sprintf(s, "_%s", extsymtab[mem].cextname);
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break;
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case STGBSS:
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case STGINIT:
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sprintf(s, "v.%ld", mem);
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break;
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case STGCONST:
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sprintf(s, "L%ld", mem);
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break;
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case STGEQUIV:
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sprintf(s, "q.%ld", mem+eqvstart);
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break;
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default:
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badstg("memname", stg);
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}
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return(s);
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}
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/* make_int_expr -- takes an arbitrary expression, and replaces all
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occurrences of arguments with indirection */
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expptr make_int_expr (e)
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expptr e;
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{
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if (e != ENULL)
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switch (e -> tag) {
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case TADDR:
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if (e -> addrblock.vstg == STGARG
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&& !e->addrblock.isarray)
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e = mkexpr (OPWHATSIN, e, ENULL);
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break;
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case TEXPR:
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e -> exprblock.leftp = make_int_expr (e -> exprblock.leftp);
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e -> exprblock.rightp = make_int_expr (e -> exprblock.rightp);
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break;
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default:
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break;
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} /* switch */
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return e;
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} /* make_int_expr */
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/* prune_left_conv -- used in prolog() to strip type cast away from
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left-hand side of parameter adjustments. This is necessary to avoid
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error messages from cktype() */
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expptr prune_left_conv (e)
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expptr e;
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{
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struct Exprblock *leftp;
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if (e && e -> tag == TEXPR && e -> exprblock.leftp &&
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e -> exprblock.leftp -> tag == TEXPR) {
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leftp = &(e -> exprblock.leftp -> exprblock);
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if (leftp -> opcode == OPCONV) {
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e -> exprblock.leftp = leftp -> leftp;
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free ((charptr) leftp);
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}
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}
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return e;
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} /* prune_left_conv */
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static int wrote_comment;
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static FILE *comment_file;
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static void
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write_comment()
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{
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if (!wrote_comment) {
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wrote_comment = 1;
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nice_printf (comment_file, "/* Parameter adjustments */\n");
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}
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}
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static int *
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count_args()
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{
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register int *ac;
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register chainp cp;
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register struct Entrypoint *ep;
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register Namep q;
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ac = (int *)ckalloc(nallargs*sizeof(int));
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for(ep = entries; ep; ep = ep->entnextp)
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for(cp = ep->arglist; cp; cp = cp->nextp)
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if (q = (Namep)cp->datap)
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ac[q->argno]++;
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return ac;
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}
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static int nu, *refs, *used;
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static void awalk();
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static void
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aawalk(P)
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struct Primblock *P;
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{
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chainp p;
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expptr q;
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for(p = P->argsp->listp; p; p = p->nextp) {
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q = (expptr)p->datap;
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if (q->tag != TCONST)
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awalk(q);
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}
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if (P->namep->vtype == TYCHAR) {
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if (q = P->fcharp)
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awalk(q);
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if (q = P->lcharp)
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awalk(q);
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}
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}
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static void
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afwalk(P)
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struct Primblock *P;
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{
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chainp p;
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expptr q;
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Namep np;
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for(p = P->argsp->listp; p; p = p->nextp) {
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q = (expptr)p->datap;
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switch(q->tag) {
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case TPRIM:
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np = q->primblock.namep;
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if (np->vknownarg)
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if (!refs[np->argno]++)
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used[nu++] = np->argno;
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if (q->primblock.argsp == 0) {
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if (q->primblock.namep->vclass == CLPROC
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&& q->primblock.namep->vprocclass
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!= PTHISPROC
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|| q->primblock.namep->vdim != NULL)
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continue;
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}
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default:
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awalk(q);
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/* no break */
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case TCONST:
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continue;
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}
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}
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}
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static void
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awalk(e)
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expptr e;
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{
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Namep np;
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top:
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if (!e)
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return;
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switch(e->tag) {
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default:
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badtag("awalk", e);
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case TCONST:
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case TERROR:
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case TLIST:
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return;
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case TADDR:
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if (e->addrblock.uname_tag == UNAM_NAME) {
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np = e->addrblock.user.name;
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if (np->vknownarg && !refs[np->argno]++)
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used[nu++] = np->argno;
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}
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e = e->addrblock.memoffset;
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goto top;
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case TPRIM:
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np = e->primblock.namep;
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if (np->vknownarg && !refs[np->argno]++)
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used[nu++] = np->argno;
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if (e->primblock.argsp && np->vclass != CLVAR)
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afwalk((struct Primblock *)e);
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else
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aawalk((struct Primblock *)e);
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return;
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case TEXPR:
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awalk(e->exprblock.rightp);
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e = e->exprblock.leftp;
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goto top;
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}
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}
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static chainp
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argsort(p0)
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chainp p0;
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{
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Namep *args, q, *stack;
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int i, nargs, nout, nst;
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chainp *d, *da, p, rv, *rvp;
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struct Dimblock *dp;
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if (!p0)
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return p0;
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for(nargs = 0, p = p0; p; p = p->nextp)
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nargs++;
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args = (Namep *)ckalloc(i = nargs*(sizeof(Namep) + 2*sizeof(chainp)
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+ 2*sizeof(int)));
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memset((char *)args, 0, i);
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stack = args + nargs;
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d = (chainp *)(stack + nargs);
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refs = (int *)(d + nargs);
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used = refs + nargs;
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for(p = p0; p; p = p->nextp) {
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q = (Namep) p->datap;
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args[q->argno] = q;
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}
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for(p = p0; p; p = p->nextp) {
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q = (Namep) p->datap;
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if (!(dp = q->vdim))
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continue;
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i = dp->ndim;
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while(--i >= 0)
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awalk(dp->dims[i].dimexpr);
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awalk(dp->basexpr);
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while(nu > 0) {
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refs[i = used[--nu]] = 0;
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d[i] = mkchain((char *)q, d[i]);
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}
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}
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for(i = nst = 0; i < nargs; i++)
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for(p = d[i]; p; p = p->nextp)
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refs[((Namep)p->datap)->argno]++;
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while(--i >= 0)
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if (!refs[i])
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stack[nst++] = args[i];
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if (nst == nargs) {
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rv = p0;
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goto done;
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}
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nout = 0;
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rv = 0;
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rvp = &rv;
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while(nst > 0) {
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nout++;
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q = stack[--nst];
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*rvp = p = mkchain((char *)q, CHNULL);
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rvp = &p->nextp;
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da = d + q->argno;
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for(p = *da; p; p = p->nextp)
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if (!--refs[(q = (Namep)p->datap)->argno])
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stack[nst++] = q;
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frchain(*da);
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}
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if (nout < nargs)
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for(i = 0; i < nargs; i++)
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if (refs[i]) {
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q = args[i];
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errstr("Can't adjust %.38s correctly\n\
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due to dependencies among arguments.",
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q->fvarname);
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*rvp = p = mkchain((char *)q, CHNULL);
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rvp = &p->nextp;
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frchain(d[i]);
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}
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done:
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free((char *)args);
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return rv;
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}
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prolog(outfile, p)
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FILE *outfile;
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register chainp p;
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{
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int addif, addif0, i, nd, size;
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int *ac;
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register Namep q;
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register struct Dimblock *dp;
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chainp p0, p1;
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if(procclass == CLBLOCK)
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return;
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p0 = p;
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p1 = p = argsort(p);
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wrote_comment = 0;
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comment_file = outfile;
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ac = 0;
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/* Compute the base addresses and offsets for the array parameters, and
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assign these values to local variables */
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addif = addif0 = nentry > 1;
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for(; p ; p = p->nextp)
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{
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q = (Namep) p->datap;
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if(dp = q->vdim) /* if this param is an array ... */
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{
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expptr Q, expr;
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/* See whether to protect the following with an if. */
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/* This only happens when there are multiple entries. */
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nd = dp->ndim - 1;
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if (addif0) {
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if (!ac)
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ac = count_args();
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if (ac[q->argno] == nentry)
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addif = 0;
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else if (dp->basexpr
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|| dp->baseoffset->constblock.Const.ci)
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addif = 1;
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else for(addif = i = 0; i <= nd; i++)
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if (dp->dims[i].dimexpr
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&& (i < nd || !q->vlastdim)) {
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addif = 1;
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break;
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}
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if (addif) {
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write_comment();
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nice_printf(outfile, "if (%s) {\n", /*}*/
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q->cvarname);
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next_tab(outfile);
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}
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}
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for(i = 0 ; i <= nd; ++i)
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/* Store the variable length of each dimension (which is fixed upon
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runtime procedure entry) into a local variable */
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if ((Q = dp->dims[i].dimexpr)
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&& (i < nd || !q->vlastdim)) {
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expr = (expptr)cpexpr(Q);
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write_comment();
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out_and_free_statement (outfile, mkexpr (OPASSIGN,
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fixtype(cpexpr(dp->dims[i].dimsize)), expr));
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} /* if dp -> dims[i].dimexpr */
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/* size will equal the size of a single element, or -1 if the type is
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variable length character type */
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size = typesize[ q->vtype ];
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if(q->vtype == TYCHAR)
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if( ISICON(q->vleng) )
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size *= q->vleng->constblock.Const.ci;
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else
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size = -1;
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/* Fudge the argument pointers for arrays so subscripts
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* are 0-based. Not done if array bounds are being checked.
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*/
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if(dp->basexpr) {
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/* Compute the base offset for this procedure */
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write_comment();
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out_and_free_statement (outfile, mkexpr (OPASSIGN,
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cpexpr(fixtype(dp->baseoffset)),
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cpexpr(fixtype(dp->basexpr))));
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} /* if dp -> basexpr */
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if(! checksubs) {
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if(dp->basexpr) {
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expptr tp;
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/* If the base of this array has a variable adjustment ... */
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tp = (expptr) cpexpr (dp -> baseoffset);
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if(size < 0 || q -> vtype == TYCHAR)
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tp = mkexpr (OPSTAR, tp, cpexpr (q -> vleng));
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write_comment();
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tp = mkexpr (OPMINUSEQ,
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mkconv (TYADDR, (expptr)p->datap),
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mkconv(TYINT, fixtype
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(fixtype (tp))));
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/* Avoid type clash by removing the type conversion */
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tp = prune_left_conv (tp);
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out_and_free_statement (outfile, tp);
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} else if(dp->baseoffset->constblock.Const.ci != 0) {
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/* if the base of this array has a nonzero constant adjustment ... */
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expptr tp;
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write_comment();
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if(size > 0 && q -> vtype != TYCHAR) {
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tp = prune_left_conv (mkexpr (OPMINUSEQ,
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mkconv (TYADDR, (expptr)p->datap),
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mkconv (TYINT, fixtype
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(cpexpr (dp->baseoffset)))));
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out_and_free_statement (outfile, tp);
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} else {
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tp = prune_left_conv (mkexpr (OPMINUSEQ,
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mkconv (TYADDR, (expptr)p->datap),
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mkconv (TYINT, fixtype
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(mkexpr (OPSTAR, cpexpr (dp -> baseoffset),
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cpexpr (q -> vleng))))));
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out_and_free_statement (outfile, tp);
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} /* else */
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} /* if dp -> baseoffset -> const */
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} /* if !checksubs */
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if (addif) {
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nice_printf(outfile, /*{*/ "}\n");
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prev_tab(outfile);
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}
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}
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}
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if (wrote_comment)
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nice_printf (outfile, "\n/* Function Body */\n");
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if (ac)
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free((char *)ac);
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if (p0 != p1)
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frchain(p1);
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} /* prolog */
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