/* xlputprop - put a property value onto the property list */
void xlputprop(LVAL sym, LVAL val, LVAL prp)
{
LVAL pair;
if ((pair = findprop(sym,prp)))
rplaca(pair,val);
else
setplist(sym,cons(prp,cons(val,getplist(sym))));
}
// Restore the symbol values to their original value and remove any added
// symbols.
LOCAL void nyx_restore_obarray()
{
LVAL obvec = getvalue(obarray);
int i;
// Scan all obarray vectors
for (i = 0; i < HSIZE; i++) {
LVAL last = NULL;
LVAL dcon;
// Scan all elements
for (dcon = getelement(obvec, i); dcon; dcon = cdr(dcon)) {
LVAL dsym = car(dcon);
char *name = (char *)getstring(getpname(dsym));
LVAL scon;
// Ignore *OBARRAY* since setting it causes the input array to be
// truncated.
if (strcmp(name, "*OBARRAY*") == 0) {
continue;
}
// Ignore *SCRATCH* since it's allowed to be updated
if (strcmp(name, "*SCRATCH*") == 0) {
continue;
}
// Find the symbol in the original obarray.
for (scon = getelement(nyx_obarray, hash(name, HSIZE)); scon; scon = cdr(scon)) {
LVAL ssym = car(scon);
// If found, then set the current symbols value to the original.
if (strcmp(name, (char *)getstring(getpname(ssym))) == 0) {
setvalue(dsym, nyx_dup_value(getvalue(ssym)));
setplist(dsym, nyx_dup_value(getplist(ssym)));
setfunction(dsym, nyx_dup_value(getfunction(ssym)));
break;
}
}
// If we didn't find the symbol in the original obarray, then it must've
// been added and must be removed from the current obarray.
if (scon == NULL) {
if (last) {
rplacd(last, cdr(dcon));
}
else {
setelement(obvec, i, cdr(dcon));
}
}
// Must track the last dcon for symbol removal
last = dcon;
}
}
}
/* xlputprop - put a property value onto the property list */
void xlputprop(NODE *sym,NODE *val,NODE *prp)
{
NODE ***oldstk,*p __HEAPIFY,*pair;
if ((pair = findprop(sym,prp)) == NIL) {
oldstk = xlsave1(&p);
p = consa(prp);
rplacd(p,pair = cons(val,getplist(sym)));
setplist(sym,p);
xlstack = oldstk;
}
rplaca(pair,val);
}
/* xlremprop - remove a property from a property list */
void xlremprop(NODE *sym,NODE *prp)
{
NODE *last,*p;
last = NIL;
for (p = getplist(sym); consp(p) && consp(cdr(p)); p = cdr(last)) {
if (car(p) == prp)
if (last)
rplacd(last,cdr(cdr(p)));
else
setplist(sym,cdr(cdr(p)));
last = cdr(p);
}
}
/* xlremprop - remove a property from a property list */
void xlremprop(LVAL sym, LVAL prp)
{
LVAL last,p;
last = NIL;
for (p = getplist(sym); consp(p) && consp(cdr(p)); p = cdr(last)) {
if (car(p) == prp) {
if (last)
rplacd(last,cdr(cdr(p)));
else
setplist(sym,cdr(cdr(p)));
}
last = cdr(p);
}
}
// Make a copy of the original obarray, leaving the original in place
LOCAL void nyx_save_obarray()
{
LVAL newarray;
int i;
// This provide permanent protection for nyx_obarray as we do not want it
// to be garbage-collected.
xlprot1(nyx_obarray);
nyx_obarray = getvalue(obarray);
// Create and set the new vector. This allows us to use xlenter() to
// properly add the new symbol. Probably slower than adding directly,
// but guarantees proper hashing.
newarray = newvector(HSIZE);
setvalue(obarray, newarray);
// Scan all obarray vectors
for (i = 0; i < HSIZE; i++) {
LVAL sym;
// Scan all elements
for (sym = getelement(nyx_obarray, i); sym; sym = cdr(sym)) {
LVAL syma = car(sym);
char *name = (char *) getstring(getpname(syma));
LVAL nsym = xlenter(name);
// Ignore *OBARRAY* since there's no need to copy it
if (strcmp(name, "*OBARRAY*") == 0) {
continue;
}
// Ignore *SCRATCH* since it's allowed to be updated
if (strcmp(name, "*SCRATCH*") == 0) {
continue;
}
// Duplicate the symbol's values
setvalue(nsym, nyx_dup_value(getvalue(syma)));
setplist(nsym, nyx_dup_value(getplist(syma)));
setfunction(nsym, nyx_dup_value(getfunction(syma)));
}
}
// Swap the obarrays, so that the original is put back into service
setvalue(obarray, nyx_obarray);
nyx_obarray = newarray;
}
/* xlapply - apply a function to arguments (already on the stack) */
LVAL xlapply(int argc)
{
LVAL *oldargv,fun,val;
LVAL funname;
LVAL old_profile_fixnum = profile_fixnum;
FIXTYPE *old_profile_count_ptr = profile_count_ptr;
int oldargc;
/* get the function */
fun = xlfp[1];
/* get the functional value of symbols */
if (symbolp(fun)) {
funname = fun; /* save it */
while ((val = getfunction(fun)) == s_unbound)
xlfunbound(fun);
fun = xlfp[1] = val;
if (profile_flag && atomp(funname)) {
LVAL profile_prop = findprop(funname, s_profile);
if (null(profile_prop)) {
/* make a new fixnum, don't use cvfixnum because
it would return shared pointer to zero, but we
are going to modify this integer in place --
dangerous but efficient.
*/
profile_fixnum = newnode(FIXNUM);
profile_fixnum->n_fixnum = 0;
setplist(funname, cons(s_profile,
cons(profile_fixnum,
getplist(funname))));
setvalue(s_profile, cons(funname, getvalue(s_profile)));
} else profile_fixnum = car(profile_prop);
profile_count_ptr = &getfixnum(profile_fixnum);
}
}
/* check for nil */
if (null(fun))
xlerror("bad function",fun);
/* dispatch on node type */
switch (ntype(fun)) {
case SUBR:
oldargc = xlargc;
oldargv = xlargv;
xlargc = argc;
xlargv = xlfp + 3;
val = (*getsubr(fun))();
xlargc = oldargc;
xlargv = oldargv;
break;
case CONS:
if (!consp(cdr(fun)))
xlerror("bad function",fun);
if (car(fun) == s_lambda) {
fun = xlclose(NIL,
s_lambda,
car(cdr(fun)),
cdr(cdr(fun)),
xlenv,xlfenv);
} else
xlerror("bad function",fun);
/**** fall through into the next case ****/
case CLOSURE:
if (gettype(fun) != s_lambda)
xlerror("bad function",fun);
val = evfun(fun,argc,xlfp+3);
break;
default:
xlerror("bad function",fun);
}
/* restore original profile counting state */
profile_fixnum = old_profile_fixnum;
profile_count_ptr = old_profile_count_ptr;
/* remove the call frame */
xlsp = xlfp;
xlfp = xlfp - (int)getfixnum(*xlfp);
/* return the function value */
return (val);
}
/* evform - evaluate a form */
LOCAL LVAL evform(LVAL form)
{
LVAL fun,args,val,type;
LVAL tracing=NIL;
LVAL *argv;
LVAL old_profile_fixnum = profile_fixnum;
FIXTYPE *old_profile_count_ptr = profile_count_ptr;
LVAL funname;
int argc;
/* protect some pointers */
xlstkcheck(2);
xlsave(fun);
xlsave(args);
(*profile_count_ptr)++; /* increment profile counter */
/* get the function and the argument list */
fun = car(form);
args = cdr(form);
funname = fun;
/* get the functional value of symbols */
if (symbolp(fun)) {
if (getvalue(s_tracelist) && member(fun,getvalue(s_tracelist)))
tracing = fun;
fun = xlgetfunction(fun);
}
/* check for nil */
if (null(fun))
xlerror("bad function",NIL);
/* dispatch on node type */
switch (ntype(fun)) {
case SUBR:
argv = xlargv;
argc = xlargc;
xlargc = evpushargs(fun,args);
xlargv = xlfp + 3;
trenter(tracing,xlargc,xlargv);
val = (*getsubr(fun))();
trexit(tracing,val);
xlsp = xlfp;
xlfp = xlfp - (int)getfixnum(*xlfp);
xlargv = argv;
xlargc = argc;
break;
case FSUBR:
argv = xlargv;
argc = xlargc;
xlargc = pushargs(fun,args);
xlargv = xlfp + 3;
val = (*getsubr(fun))();
xlsp = xlfp;
xlfp = xlfp - (int)getfixnum(*xlfp);
xlargv = argv;
xlargc = argc;
break;
case CONS:
if (!consp(cdr(fun)))
xlerror("bad function",fun);
if ((type = car(fun)) == s_lambda)
fun = xlclose(NIL,
s_lambda,
car(cdr(fun)),
cdr(cdr(fun)),
xlenv,xlfenv);
else
xlerror("bad function",fun);
/**** fall through into the next case ****/
case CLOSURE:
/* do profiling */
if (profile_flag && atomp(funname)) {
LVAL profile_prop = findprop(funname, s_profile);
if (null(profile_prop)) {
/* make a new fixnum, don't use cvfixnum because
it would return shared pointer to zero, but we
are going to modify this integer in place --
dangerous but efficient.
*/
profile_fixnum = newnode(FIXNUM);
profile_fixnum->n_fixnum = 0;
setplist(funname, cons(s_profile,
cons(profile_fixnum,
getplist(funname))));
setvalue(s_profile, cons(funname, getvalue(s_profile)));
} else profile_fixnum = car(profile_prop);
profile_count_ptr = &getfixnum(profile_fixnum);
}
if (gettype(fun) == s_lambda) {
argc = evpushargs(fun,args);
argv = xlfp + 3;
trenter(tracing,argc,argv);
val = evfun(fun,argc,argv);
trexit(tracing,val);
xlsp = xlfp;
xlfp = xlfp - (int)getfixnum(*xlfp);
}
else {
macroexpand(fun,args,&fun);
val = xleval(fun);
}
profile_fixnum = old_profile_fixnum;
profile_count_ptr = old_profile_count_ptr;
break;
default:
xlerror("bad function",fun);
}
/* restore the stack */
xlpopn(2);
/* return the result value */
return (val);
}
