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• Error-checking

Ensure-function-no-stobjs

Cause an error if a function has input or output stobjs.

Signature

(ensure-function-no-stobjs fn description 
                           error-erp error-val ctx state) 
 
  → 
(mv erp val state)

Arguments

fn — Function to check.
    Guard (and (function-namep fn (w state)) (not (member-eq fn *stobjs-out-invalid*))) .

description — Guard (msgp description).

error-erp — Flag to return in case of error.

error-val — Value to return in case of error.

ctx — Context for errors.

Returns

erp — Type (implies erp (equal erp error-erp)).

val — Type (and (implies erp (equal val error-val)) (implies (and (not erp) error-erp) (not val))) .

The function must not be one whose stobjs-out are invalid.

Definitions and Theorems

Function: ensure-function-no-stobjs

(defun ensure-function-no-stobjs (fn description
                                     error-erp error-val ctx state)
 (declare (xargs :stobjs (state)))
 (declare
  (xargs
      :guard (and (msgp description)
                  (and (function-namep fn (w state))
                       (not (member-eq fn *stobjs-out-invalid*))))))
 (b* (((unless (no-stobjs-p fn (w state)))
       (er-soft+ ctx error-erp error-val
                 "~@0 must have no input or output stobjs."
                 description)))
   (value nil)))

Theorem: return-type-of-ensure-function-no-stobjs.erp

(defthm return-type-of-ensure-function-no-stobjs.erp
  (b* (((mv ?erp ?val ?state)
        (ensure-function-no-stobjs fn description
                                   error-erp error-val ctx state)))
    (implies erp (equal erp error-erp)))
  :rule-classes :rewrite)

Theorem: return-type-of-ensure-function-no-stobjs.val

(defthm return-type-of-ensure-function-no-stobjs.val
  (b* (((mv ?erp ?val ?state)
        (ensure-function-no-stobjs fn description
                                   error-erp error-val ctx state)))
    (and (implies erp (equal val error-val))
         (implies (and (not erp) error-erp)
                  (not val))))
  :rule-classes :rewrite)

Subtopics

Ensure-function-no-stobjs$

Calls ensure-function-no-stobjs with ctx and state as the last two arguments.