enum eval_state {
eval_sexpr,
eval_val,
+ eval_formal,
eval_exec,
- eval_exec_direct
+ eval_exec_direct,
+ eval_cond,
+ eval_cond_test
};
struct ao_lisp_stack {
}
}
+static const struct ao_lisp_type ao_lisp_stack_type;
+
static void
stack_move(void *addr)
{
struct ao_lisp_stack *stack = addr;
- for (;;) {
- struct ao_lisp_stack *prev;
- stack->actuals = ao_lisp_poly_move(stack->actuals);
- stack->formals = ao_lisp_poly_move(stack->formals);
- stack->frame = ao_lisp_poly_move(stack->frame);
- prev = ao_lisp_ref(stack->prev);
- prev = ao_lisp_move_memory(prev, sizeof (struct ao_lisp_stack));
- stack->prev = ao_lisp_stack_poly(prev);
- stack = prev;
+ while (stack) {
+ void *prev;
+ int ret;
+ (void) ao_lisp_poly_move(&stack->actuals);
+ (void) ao_lisp_poly_move(&stack->formals);
+ (void) ao_lisp_poly_move(&stack->frame);
+ prev = ao_lisp_poly_stack(stack->prev);
+ ret = ao_lisp_move(&ao_lisp_stack_type, &prev);
+ if (prev != ao_lisp_poly_stack(stack->prev))
+ stack->prev = ao_lisp_stack_poly(prev);
+ if (ret);
+ break;
+ stack = ao_lisp_poly_stack(stack->prev);
}
}
.move = stack_move
};
-
static struct ao_lisp_stack *ao_lisp_stack;
+static ao_poly ao_lisp_v;
static uint8_t been_here;
ao_poly
ao_lisp_set_cond(struct ao_lisp_cons *c)
{
+ ao_lisp_stack->state = eval_cond;
+ ao_lisp_stack->actuals = ao_lisp_cons_poly(c);
return AO_LISP_NIL;
}
-static void
+void
ao_lisp_stack_reset(struct ao_lisp_stack *stack)
{
stack->state = eval_sexpr;
stack->frame = ao_lisp_frame_poly(ao_lisp_frame_current);
}
-static struct ao_lisp_stack *
+struct ao_lisp_stack *
ao_lisp_stack_push(void)
{
struct ao_lisp_stack *stack = ao_lisp_alloc(sizeof (struct ao_lisp_stack));
if (!stack)
return NULL;
stack->prev = ao_lisp_stack_poly(ao_lisp_stack);
- ao_lisp_stack_reset(stack);
ao_lisp_stack = stack;
+ ao_lisp_stack_reset(stack);
DBGI("stack push\n");
DBG_IN();
return stack;
}
-static struct ao_lisp_stack *
+struct ao_lisp_stack *
ao_lisp_stack_pop(void)
{
if (!ao_lisp_stack)
ao_lisp_frame_current = NULL;
}
-
static ao_poly
func_type(ao_poly func)
{
f++;
}
return ao_lisp_arg(cons, 0);
- } else
- return ao_lisp_error(AO_LISP_INVALID, "not a func");
+ } else {
+ ao_lisp_error(AO_LISP_INVALID, "not a func");
+ abort();
+ return AO_LISP_NIL;
+ }
}
static int
args_provided = 1;
if (args_wanted != args_provided)
return ao_lisp_error(AO_LISP_INVALID, "need %d args, not %d", args_wanted, args_provided);
- next_frame = ao_lisp_frame_new(args_wanted, 0);
+ next_frame = ao_lisp_frame_new(args_wanted);
DBGI("new frame %d\n", OFFSET(next_frame));
switch (type) {
case _ao_lisp_atom_lambda: {
}
ao_poly
-ao_lisp_eval(ao_poly v)
+ao_lisp_eval(ao_poly _v)
{
struct ao_lisp_stack *stack;
ao_poly formal;
+ ao_lisp_v = _v;
if (!been_here) {
been_here = 1;
- ao_lisp_root_add(&ao_lisp_stack_type, &stack);
+ ao_lisp_root_add(&ao_lisp_stack_type, &ao_lisp_stack);
+ ao_lisp_root_poly_add(&ao_lisp_v);
}
stack = ao_lisp_stack_push();
return AO_LISP_NIL;
switch (stack->state) {
case eval_sexpr:
- DBGI("sexpr: "); DBG_POLY(v); DBG("\n");
- switch (ao_lisp_poly_type(v)) {
+ DBGI("sexpr: "); DBG_POLY(ao_lisp_v); DBG("\n");
+ switch (ao_lisp_poly_type(ao_lisp_v)) {
case AO_LISP_CONS:
- if (v == AO_LISP_NIL) {
+ if (ao_lisp_v == AO_LISP_NIL) {
stack->state = eval_exec;
break;
}
- stack->actuals = v;
+ stack->actuals = ao_lisp_v;
+ stack->state = eval_formal;
stack = ao_lisp_stack_push();
- v = ao_lisp_poly_cons(v)->car;
+ ao_lisp_v = ao_lisp_poly_cons(ao_lisp_v)->car;
break;
case AO_LISP_ATOM:
- v = ao_lisp_atom_get(v);
+ ao_lisp_v = ao_lisp_atom_get(ao_lisp_v);
/* fall through */
case AO_LISP_INT:
case AO_LISP_STRING:
}
break;
case eval_val:
- DBGI("val: "); DBG_POLY(v); DBG("\n");
+ DBGI("val: "); DBG_POLY(ao_lisp_v); DBG("\n");
stack = ao_lisp_stack_pop();
if (!stack)
- return v;
+ return ao_lisp_v;
+ DBGI("..state %d\n", stack->state);
+ break;
- stack->state = eval_sexpr;
+ case eval_formal:
/* Check what kind of function we've got */
if (!stack->formals) {
- switch (func_type(v)) {
+ switch (func_type(ao_lisp_v)) {
case AO_LISP_LAMBDA:
case _ao_lisp_atom_lambda:
case AO_LISP_LEXPR:
break;
}
- formal = ao_lisp_cons_poly(ao_lisp_cons_cons(v, NULL));
+ formal = ao_lisp_cons_poly(ao_lisp_cons_cons(ao_lisp_v, NULL));
if (!formal) {
ao_lisp_stack_clear();
return AO_LISP_NIL;
DBGI("formals now "); DBG_POLY(stack->formals); DBG("\n");
- v = ao_lisp_poly_cons(stack->actuals)->cdr;
+ ao_lisp_v = ao_lisp_poly_cons(stack->actuals)->cdr;
+
+ stack->state = eval_sexpr;
break;
case eval_exec:
- v = ao_lisp_poly_cons(stack->formals)->car;
+ if (!stack->formals) {
+ ao_lisp_v = AO_LISP_NIL;
+ stack->state = eval_val;
+ break;
+ }
+ ao_lisp_v = ao_lisp_poly_cons(stack->formals)->car;
case eval_exec_direct:
- DBGI("exec: macro %d ", stack->macro); DBG_POLY(v); DBG(" formals "); DBG_POLY(stack->formals); DBG ("\n");
- if (ao_lisp_poly_type(v) == AO_LISP_BUILTIN) {
- struct ao_lisp_builtin *b = ao_lisp_poly_builtin(v);
+ DBGI("exec: macro %d ", stack->macro); DBG_POLY(ao_lisp_v); DBG(" formals "); DBG_POLY(stack->formals); DBG ("\n");
+ if (ao_lisp_poly_type(ao_lisp_v) == AO_LISP_BUILTIN) {
+ struct ao_lisp_builtin *b = ao_lisp_poly_builtin(ao_lisp_v);
struct ao_lisp_cons *f = ao_lisp_poly_cons(ao_lisp_poly_cons(stack->formals)->cdr);
DBGI(".. builtin formals "); DBG_CONS(f); DBG("\n");
- v = ao_lisp_func(b) (f);
- DBGI("builtin result:"); DBG_POLY(v); DBG ("\n");
- if (ao_lisp_exception) {
- ao_lisp_stack_clear();
- return AO_LISP_NIL;
- }
if (stack->macro)
stack->state = eval_sexpr;
else
stack->state = eval_val;
stack->macro = 0;
+ ao_lisp_v = ao_lisp_func(b) (f);
+ DBGI("builtin result:"); DBG_POLY(ao_lisp_v); DBG ("\n");
+ if (ao_lisp_exception) {
+ ao_lisp_stack_clear();
+ return AO_LISP_NIL;
+ }
break;
} else {
- v = ao_lisp_lambda(ao_lisp_poly_cons(stack->formals));
+ ao_lisp_v = ao_lisp_lambda(ao_lisp_poly_cons(stack->formals));
ao_lisp_stack_reset(stack);
}
break;
- }
- }
-}
-#if 0
-
-
- restart:
- if (cond) {
- DBGI("cond is now "); DBG_CONS(cond); DBG("\n");
- if (cond->car == AO_LISP_NIL) {
- cond = AO_LISP_NIL;
- v = AO_LISP_NIL;
+ case eval_cond:
+ DBGI("cond: "); DBG_POLY(stack->actuals); DBG("\n");
+ if (!stack->actuals) {
+ ao_lisp_v = AO_LISP_NIL;
+ stack->state = eval_val;
} else {
- if (ao_lisp_poly_type(cond->car) != AO_LISP_CONS) {
- ao_lisp_error(AO_LISP_INVALID, "malformed cond");
+ ao_lisp_v = ao_lisp_poly_cons(stack->actuals)->car;
+ if (!ao_lisp_v || ao_lisp_poly_type(ao_lisp_v) != AO_LISP_CONS) {
+ ao_lisp_error(AO_LISP_INVALID, "invalid cond clause");
goto bail;
}
- v = ao_lisp_poly_cons(cond->car)->car;
+ ao_lisp_v = ao_lisp_poly_cons(ao_lisp_v)->car;
+ stack->state = eval_cond_test;
+ stack = ao_lisp_stack_push();
+ stack->state = eval_sexpr;
}
- }
-
- /* Build stack frames for each list */
- while (ao_lisp_poly_type(v) == AO_LISP_CONS) {
- if (v == AO_LISP_NIL)
- break;
-
- /* Push existing bits on the stack */
- if (cons++)
- if (!ao_lisp_stack_push())
- goto bail;
-
- actuals = ao_lisp_poly_cons(v);
- formals = NULL;
- formals_tail = NULL;
- save_cond = cond;
- cond = NULL;
-
- v = actuals->car;
-
-// DBG("start: stack"); DBG_CONS(stack); DBG("\n");
-// DBG("start: actuals"); DBG_CONS(actuals); DBG("\n");
-// DBG("start: formals"); DBG_CONS(formals); DBG("\n");
- }
-
- if (ao_lisp_poly_type(v) == AO_LISP_BUILTIN) {
- struct ao_lisp_builtin *b = ao_lisp_poly_builtin(v);
- switch (b->args) {
- case AO_LISP_NLAMBDA:
- formals = actuals;
- goto eval;
-
- case AO_LISP_MACRO:
- v = ao_lisp_func(b)(ao_lisp_poly_cons(actuals->cdr));
- DBG("macro "); DBG_POLY(ao_lisp_cons_poly(actuals));
- DBG(" -> "); DBG_POLY(v);
- DBG("\n");
- if (ao_lisp_poly_type(v) != AO_LISP_CONS) {
- ao_lisp_error(AO_LISP_INVALID, "macro didn't return list");
- goto bail;
- }
- /* Reset frame to the new list */
- actuals = ao_lisp_poly_cons(v);
- v = actuals->car;
- goto restart;
- }
- /* Evaluate primitive types */
-
- DBG ("actual: "); DBG_POLY(v); DBG("\n");
-
- switch (ao_lisp_poly_type(v)) {
- case AO_LISP_INT:
- case AO_LISP_STRING:
break;
- case AO_LISP_ATOM:
- v = ao_lisp_atom_get(v);
- break;
- }
-
- while (cons) {
- DBG("add formal: "); DBG_POLY(v); DBG("\n");
-
- /* We've processed the first element of the list, go check
- * what kind of function we've got
- */
- if (formals == NULL) {
- if (ao_lisp_poly_type(v) == AO_LISP_BUILTIN) {
- struct ao_lisp_builtin *b = ao_lisp_poly_builtin(v);
- switch (b->args) {
- case AO_LISP_NLAMBDA:
- formals = actuals;
- goto eval;
-
- case AO_LISP_MACRO:
- v = ao_lisp_func(b)(ao_lisp_poly_cons(actuals->cdr));
- DBG("macro "); DBG_POLY(ao_lisp_cons_poly(actuals));
- DBG(" -> "); DBG_POLY(v);
- DBG("\n");
- if (ao_lisp_poly_type(v) != AO_LISP_CONS) {
- ao_lisp_error(AO_LISP_INVALID, "macro didn't return list");
- goto bail;
- }
- /* Reset frame to the new list */
- actuals = ao_lisp_poly_cons(v);
- v = actuals->car;
- goto restart;
- }
+ case eval_cond_test:
+ DBGI("cond_test "); DBG_POLY(ao_lisp_v); DBG("\n");
+ if (ao_lisp_v) {
+ struct ao_lisp_cons *car = ao_lisp_poly_cons(ao_lisp_poly_cons(stack->actuals)->car);
+ struct ao_lisp_cons *c = ao_lisp_poly_cons(car->cdr);
+ if (c) {
+ ao_lisp_v = c->car;
+ stack->state = eval_sexpr;
} else {
- switch (func_type(v)) {
- case _ao_lisp_atom_lambda:
- case _ao_lisp_atom_lexpr:
- break;
- case _ao_lisp_atom_nlambda:
- formals = actuals;
- goto eval;
- case _ao_lisp_atom_macro:
- break;
- default:
- ao_lisp_error(AO_LISP_INVALID, "operator is not a function");
- goto bail;
- }
- }
- }
-
- formal = ao_lisp_cons_cons(v, NULL);
- if (formals_tail)
- formals_tail->cdr = ao_lisp_cons_poly(formal);
- else
- formals = formal;
- formals_tail = formal;
- actuals = ao_lisp_poly_cons(actuals->cdr);
-
- DBG("formals: ");
- DBG_CONS(formals);
- DBG("\n");
- DBG("actuals: ");
- DBG_CONS(actuals);
- DBG("\n");
-
- /* Process all of the arguments */
- if (actuals) {
- v = actuals->car;
- break;
- }
-
- v = formals->car;
-
- eval:
-
- /* Evaluate the resulting list */
- if (ao_lisp_poly_type(v) == AO_LISP_BUILTIN) {
- struct ao_lisp_cons *old_cond = cond;
- struct ao_lisp_builtin *b = ao_lisp_poly_builtin(v);
-
- v = ao_lisp_func(b) (ao_lisp_poly_cons(formals->cdr));
-
- DBG ("eval: ");
- DBG_CONS(formals);
- DBG(" -> ");
- DBG_POLY(v);
- DBG ("\n");
- if (ao_lisp_exception)
- goto bail;
-
- if (cond != old_cond) {
- DBG("cond changed from "); DBG_CONS(old_cond); DBG(" to "); DBG_CONS(cond); DBG("\n");
- actuals = NULL;
- formals = 0;
- formals_tail = 0;
- save_cons = cons;
- cons = 0;
- goto restart;
- }
- } else {
- v = ao_lisp_lambda(formals);
- if (ao_lisp_exception)
- goto bail;
- }
-
- cond_done:
- --cons;
- if (cons) {
- ao_lisp_stack_pop();
-// DBG("stack pop: stack"); DBG_CONS(stack); DBG("\n");
-// DBG("stack pop: actuals"); DBG_CONS(actuals); DBG("\n");
-// DBG("stack pop: formals"); DBG_CONS(formals); DBG("\n");
- } else {
- actuals = 0;
- formals = 0;
- formals_tail = 0;
- ao_lisp_frame_current = 0;
- }
- if (next_frame) {
- ao_lisp_frame_current = next_frame;
- DBG("next frame %d\n", OFFSET(next_frame));
- next_frame = 0;
- goto restart;
- }
- }
- if (cond) {
- DBG("next cond cons is %d\n", cons);
- if (v) {
- v = ao_lisp_poly_cons(cond->car)->cdr;
- cond = 0;
- cons = save_cons;
- if (v != AO_LISP_NIL) {
- v = ao_lisp_poly_cons(v)->car;
- DBG("cond complete, sexpr is "); DBG_POLY(v); DBG("\n");
+ stack->state = eval_val;
}
- goto cond_done;
} else {
- cond = ao_lisp_poly_cons(cond->cdr);
- DBG("next cond is "); DBG_CONS(cond); DBG("\n");
- goto restart;
+ stack->actuals = ao_lisp_poly_cons(stack->actuals)->cdr;
+ stack->state = eval_cond;
}
- }
- if (!cons)
break;
+ }
}
- DBG("leaving frame at %d\n", OFFSET(ao_lisp_frame_current));
- return v;
bail:
ao_lisp_stack_clear();
return AO_LISP_NIL;
-#endif
-
+}
projects / fw / altos / blobdiff