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• Error-checking

Ensure-term-does-not-call

Cause an error if a term calls a given function.

Signature

(ensure-term-does-not-call term fn description 
                           error-erp error-val ctx state) 
 
  → 
(mv erp val state)

Arguments

term — Term to check.
    Guard (pseudo-termp term).

fn — Function that term must not call.
    Guard (symbolp fn).

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))) .

Definitions and Theorems

Function: ensure-term-does-not-call

(defun ensure-term-does-not-call
       (term fn description
             error-erp error-val ctx state)
  (declare (xargs :stobjs (state)))
  (declare (xargs :guard (and (pseudo-termp term)
                              (symbolp fn)
                              (msgp description))))
  (b* (((when (ffnnamep fn term))
        (er-soft+ ctx error-erp
                  error-val "~@0 must not call ~x1."
                  description fn)))
    (value nil)))

Theorem: return-type-of-ensure-term-does-not-call.erp

(defthm return-type-of-ensure-term-does-not-call.erp
  (b* (((mv ?erp ?val ?state)
        (ensure-term-does-not-call term fn description
                                   error-erp error-val ctx state)))
    (implies erp (equal erp error-erp)))
  :rule-classes :rewrite)

Theorem: return-type-of-ensure-term-does-not-call.val

(defthm return-type-of-ensure-term-does-not-call.val
  (b* (((mv ?erp ?val ?state)
        (ensure-term-does-not-call term 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-term-does-not-call$

Calls ensure-term-does-not-call with ctx and state as the last two arguments.