SEXP RKStructureGetter::resolvePromise (SEXP from) {
RK_TRACE (RBACKEND);
SEXP ret = from;
if (TYPEOF (from) == PROMSXP) {
ret = PRVALUE(from);
if (ret == R_UnboundValue) {
RK_DEBUG (RBACKEND, DL_DEBUG, "temporarily resolving unbound promise");
PROTECT (from);
SET_PRSEEN(from, 1);
ret = Rf_eval(PRCODE(from), PRENV(from));
SET_PRSEEN(from, 0);
if (keep_evalled_promises) {
SET_PRVALUE(from, ret);
SET_PRENV(from, R_NilValue);
}
UNPROTECT (1);
RK_DEBUG (RBACKEND, DL_DEBUG, "resolved type is %d", TYPEOF (ret));
}
}
return ret;
}
void attribute_hidden R_restore_globals(RCNTXT *cptr)
{
R_PPStackTop = cptr->cstacktop;
R_EvalDepth = cptr->evaldepth;
vmaxset(cptr->vmax);
R_interrupts_suspended = cptr->intsusp;
R_HandlerStack = cptr->handlerstack;
R_RestartStack = cptr->restartstack;
while (R_PendingPromises != cptr->prstack) {
/* The value 2 installed in PRSEEN 2 allows forcePromise in
eval.c to signal a warning when asked to evaluate a promise
whose evaluation has been interrupted by a jump. */
SET_PRSEEN(R_PendingPromises->promise, 2);
R_PendingPromises = R_PendingPromises->next;
}
/* Need to reset R_Expressions in case we are jumping after
handling a stack overflow. */
R_Expressions = R_Expressions_keep;
R_BCNodeStackTop = cptr->nodestack;
#ifdef BC_INT_STACK
R_BCIntStackTop = cptr->intstack;
#endif
R_Srcref = cptr->srcref;
}