+#include "../h/rt.h"
+#ifdef VAX
+/*
+ * ^x - return an entry block for co-expression x from the refresh block.
+ * NOTE: this code is highly dependent on stack frame layout.
+ */
+
+refresh(nargs, arg1, arg0)
+int nargs;
+struct descrip arg1, arg0;
+ {
+ register int *ap, *sp, *tp;
+ struct descrip *dp, *dsp;
+ register struct b_estack *ep;
+ register struct b_eblock *hp;
+ int na, nl, *r5, *newap;
+ extern struct b_estack *alcestk();
+#ifdef INT
+ extern interp();
+#endif INT
+
+ SetBound;
+ deref(&arg1);
+ if (TYPE(arg1) != T_ESTACK)
+ runerr(118, &arg1);
+
+ esneed(); /* check for room in stack space */
+ ep = alcestk(); /* allocate expression stack */
+ ep->activator = nulldesc;
+ ep->nresults = 0;
+ ep->freshblk = BLKLOC(arg1)->estack.freshblk;
+
+ ep->sbase = sp = (int *)ep; /* initialize new stack pointer */
+ hp = BLKLOC(ep->freshblk);
+ na = hp->numargs; /* get value of nargs */
+ nl = hp->numlocals;
+ ap = hp->elems; /* find arg0 of caller */
+
+ /* copy arguments into new stack and refresh block */
+ dsp = sp;
+ dp = ap;
+ *--dsp = *dp++;
+ while (na-- > 0) {
+ *--dsp = *dp++;
+ }
+ sp = dsp;
+ ap = dp;
+
+ /* set up original procedure frame in new stack */
+ *--sp = hp->numargs; /* copy nargs */
+ *--sp = (hp->numargs*2) + 1; /*+ invent a nwords value ??-whm */
+ newap = sp;
+#ifdef INT
+ *--sp = interp; /* return pc */
+#endif INT
+#ifdef CMP
+ *--sp = 0; /* return pc */
+#endif CMP
+ *--sp = 0; /* saved r5 (frame pointer) */
+ *--sp = 0; /* saved ap */
+ *--sp = 0; /* psw/reg. mask */
+ *--sp = 0; /* condition handler */
+ r5 = sp; /* (save its address) */
+ *--sp = line; /* saved line number */
+ *--sp = file; /* saved file name */
+
+ /* copy local variables into new stack */
+ dsp = sp;
+ dp = ap;
+ while (nl-- > 0) {
+ *--dsp = *dp++;
+ }
+ sp = dsp;
+ ap = dp;
+
+ /* set up dummy call to activate */
+ *--sp = nulldesc.type; /* place for result */
+ *--sp = INTVAL(nulldesc);
+ *--sp = nulldesc.type; /* place for activate coexpr */
+ *--sp = INTVAL(nulldesc);
+ /* these values are the initial register state for the coexpression */
+ *--sp = 1; /* nargs */
+ *--sp = 3; /* nwords */
+ tp = sp; /* save pointer to start of arg
+ list in this frame */
+#ifdef INT
+ *--sp = hp->ep; /* saved r9 (coexpr entry point) */
+ *--sp = interp; /* return pc (entry point) */
+#endif INT
+#ifdef CMP
+ *--sp = 0; /* saved r9 (coexpr entry point) */
+ *--sp = hp->ep; /* return pc (entry point) */
+#endif CMP
+ *--sp = r5; /* saved r5 */
+ *--sp = newap; /* saved ap */
+ *--sp = 0x02000000; /* psw/reg mask with bit set to
+ restore r9, the ipc */
+ *--sp = 0;
+ ep->boundary = sp; /* (initial boundary) */
+ *--sp = line; /* saved line number */
+ *--sp = file; /* saved file name */
+ ep->sp = sp; /* initial stack pointer */
+ ep->ap = tp;
+ arg0.type = D_ESTACK;
+ BLKLOC(arg0) = ep;
+ ClearBound;
+ }
+struct b_iproc Brefresh = {
+ T_PROC,
+ sizeof(struct b_proc),
+ EntryPoint(refresh),
+ 1,
+ -1,
+ 0,
+ 0,
+ {1, "^"}
+ };
+#endif VAX
+#ifdef PDP11
+/*
+ * ^x - return an entry block for co-expression x from the refresh block.
+ * NOTE: this code is highly dependent on stack frame layout.
+ */
+
+refresh(nargs, arg1, arg0)
+int nargs;
+struct descrip arg1, arg0;
+ {
+ register int *ap, *sp;
+ register struct b_estack *ep;
+ register struct b_eblock *hp;
+ int na, nl, *r5;
+ extern struct b_estack *alcestk();
+#ifdef INT
+ extern interp();
+#endif INT
+
+ deref(&arg1);
+ if (TYPE(arg1) != T_ESTACK)
+ runerr(118, &arg1);
+
+ esneed(); /* check for room in stack space */
+ ep = alcestk(); /* allocate expression stack */
+ ep->activator = nulldesc;
+ ep->nresults = 0;
+ ep->freshblk = BLKLOC(arg1)->estack.freshblk;
+
+ ep->sbase = sp = (int *)ep; /* initialize new stack pointer */
+ hp = BLKLOC(ep->freshblk);
+ na = hp->numargs; /* get value of nargs */
+ nl = hp->numlocals;
+ ap = hp->elems; /* find arg0 of caller */
+
+ /* copy arguments into new stack and refresh block */
+ *--(struct descrip *)sp = *(struct descrip *)ap; /* copy arg0 */
+ while (na-- > 0)
+ *--(struct descrip *)sp = *++(struct descrip *)ap;
+
+ /* set up original procedure frame in new stack */
+ *--sp = hp->numargs; /* copy nargs */
+ *--sp = 0; /* return pc */
+ *--sp = 0; /* saved r5 */
+ r5 = sp; /* (save its address) */
+ *--sp = 0; /* saved r4 */
+ *--sp = 0; /* saved r3 */
+ *--sp = 0; /* saved r2 */
+ *--sp = line; /* saved line number */
+ *--sp = file; /* saved file name */
+
+ /* copy local variables into new stack */
+ while (nl-- > 0)
+ *--(struct descrip *)sp = *++(struct descrip *)ap;
+
+ /* set up dummy call to activate */
+ *--(struct descrip *)sp = nulldesc; /* place for result */
+ *--(struct descrip *)sp = nulldesc; /* place for activate coexpr */
+ /* these values are the initial register state for the coexpression */
+ *--sp = 1; /* nargs */
+#ifdef INT
+ *--sp = interp; /* return pc (entry point) */
+#endif INT
+#ifdef CMP
+ *--sp = hp->ep; /* return pc (entry point) */
+#endif CMP
+ *--sp = r5; /* saved r5 */
+ ep->boundary = sp; /* (initial boundary) */
+ *--sp = 0; /* saved r4 */
+ *--sp = 0; /* saved r3 */
+#ifdef INT
+ *--sp = hp->ep; /* saved r2 */
+#endif INT
+#ifdef CMP
+ *--sp = 0; /* saved r2 */
+#endif CMP
+ *--sp = line; /* saved line number */
+ *--sp = file; /* saved file name */
+ ep->sp = sp; /* initial stack pointer */
+ arg0.type = D_ESTACK;
+ BLKLOC(arg0) = ep;
+ }
+struct b_iproc Brefresh = {
+ T_PROC,
+ sizeof(struct b_proc),
+ EntryPoint(refresh),
+ 1,
+ -1,
+ 0,
+ 0,
+ {1, "^"}
+ };
+#endif PDP11
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