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Lookup-main-function

Look up the main function in a file.

Signature

(lookup-main-function file) → fundecl?

Arguments

file — Guard (filep file).

Returns

fundecl? — Type (fundecl-optionp fundecl?).

We go through the file and return the declaration of the first function named main, which is also the only one if the file is type-checked. We return nil if no function named main is found.

Definitions and Theorems

Function: lookup-main-function-aux

(defun lookup-main-function-aux (decls)
  (declare (xargs :guard (topdecl-listp decls)))
  (let ((__function__ 'lookup-main-function-aux))
    (declare (ignorable __function__))
    (b* (((when (endp decls)) nil)
         (decl (car decls))
         ((unless (topdecl-case decl :function))
          (lookup-main-function-aux (cdr decls)))
         (fundecl (topdecl-function->get decl))
         ((when (equal (fundecl->name fundecl)
                       (identifier "main")))
          fundecl))
      (lookup-main-function-aux (cdr decls)))))

Theorem: fundecl-optionp-of-lookup-main-function-aux

(defthm fundecl-optionp-of-lookup-main-function-aux
  (b* ((fundecl? (lookup-main-function-aux decls)))
    (fundecl-optionp fundecl?))
  :rule-classes :rewrite)

Theorem: lookup-main-function-aux-of-topdecl-list-fix-decls

(defthm lookup-main-function-aux-of-topdecl-list-fix-decls
  (equal (lookup-main-function-aux (topdecl-list-fix decls))
         (lookup-main-function-aux decls)))

Theorem: lookup-main-function-aux-topdecl-list-equiv-congruence-on-decls

(defthm
    lookup-main-function-aux-topdecl-list-equiv-congruence-on-decls
  (implies (topdecl-list-equiv decls decls-equiv)
           (equal (lookup-main-function-aux decls)
                  (lookup-main-function-aux decls-equiv)))
  :rule-classes :congruence)

Function: lookup-main-function

(defun lookup-main-function (file)
  (declare (xargs :guard (filep file)))
  (let ((__function__ 'lookup-main-function))
    (declare (ignorable __function__))
    (lookup-main-function-aux
         (programdecl->items (file->program file)))))

Theorem: fundecl-optionp-of-lookup-main-function

(defthm fundecl-optionp-of-lookup-main-function
  (b* ((fundecl? (lookup-main-function file)))
    (fundecl-optionp fundecl?))
  :rule-classes :rewrite)

Theorem: lookup-main-function-of-file-fix-file

(defthm lookup-main-function-of-file-fix-file
  (equal (lookup-main-function (file-fix file))
         (lookup-main-function file)))

Theorem: lookup-main-function-file-equiv-congruence-on-file

(defthm lookup-main-function-file-equiv-congruence-on-file
  (implies (file-equiv file file-equiv)
           (equal (lookup-main-function file)
                  (lookup-main-function file-equiv)))
  :rule-classes :congruence)