+++ /dev/null
-(in-package "SPECIALIZABLE")
-
-(defclass binding ()
- ((used :initform nil :accessor used)))
-
-(defun make-env (bindings env)
- (append bindings env))
-(defun find-binding (env var)
- (cdr (assoc var env)))
-
-(defun bindings-from-ll (ll)
- (mapcar (lambda (n) (cons n (make-instance 'binding))) ll))
-
-(define-condition walker-warning (warning)
- ((env :initarg :env :reader env)
- (call-stack :initarg :call-stack :reader call-stack)))
-(define-condition unused-variable (walker-warning)
- ((name :initarg :name :reader name)))
-(define-condition unbound-variable-referenced (walker-warning)
- ((name :initarg :name :reader name)))
-
-(fmakunbound 'walk)
-(defgeneric walk (form env vars)
- (:generic-function-class cons-generic-function))
-
-(defmethod walk ((expr cons) env call-stack)
- (let ((cs (cons expr call-stack)))
- (when (consp (car expr))
- (walk (car expr) env cs))
- (dolist (e (cdr expr))
- (walk e env (cons e cs)))))
-(defmethod walk ((expr symbol) env call-stack)
- (if (constantp expr)
- nil
- (let ((binding (find-binding env expr)))
- (if binding
- (setf (used binding) t)
- (warn 'unbound-variable-referenced :name expr
- :env env :call-stack call-stack)))))
-(defmethod walk ((expr t) env call-stack)
- nil)
-(defmacro with-checked-bindings ((bindings env call-stack) &body body)
- `(let* ((bindings ,bindings)
- (,env (make-env bindings ,env)))
- ,@body
- (dolist (binding bindings)
- (unless (used (cdr binding))
- (warn 'unused-variable :name (car binding)
- :env ,env :call-stack ,call-stack)))))
-(defmethod walk ((expr (cons lambda)) env call-stack)
- (let ((lambda-list (cadr expr))
- (body (cddr expr)))
- (with-checked-bindings ((bindings-from-ll lambda-list) env call-stack)
- (dolist (form body)
- (walk form env (cons form call-stack))))))
-(defmethod walk ((expr (cons multiple-value-bind)) env call-stack)
- (let ((lambda-list (cadr expr))
- (value-form (caddr expr))
- (body (cdddr expr)))
- (walk value-form env (cons value-form call-stack))
- (with-checked-bindings ((bindings-from-ll lambda-list) env call-stack)
- (dolist (form body)
- (walk form env (cons form call-stack))))))
-(defmethod walk ((expr (cons let)) env call-stack)
- (flet ((let-binding (x)
- (walk (cadr x) env (cons (cadr x) call-stack))
- (cons (car x) (make-instance 'binding))))
- (with-checked-bindings ((mapcar #'let-binding (cadr expr)) env call-stack)
- (dolist (form (cddr expr))
- (walk form env (cons form call-stack))))))
-
-(defun walk/case (expr env call-stack)
- (typecase expr
- (symbol
- (if (constantp expr)
- nil
- (let ((binding (find-binding env expr)))
- (if binding
- (setf (used binding) t)
- (warn 'unbound-variable-referenced :name expr
- :env env :call-stack call-stack)))))
- ((cons (eql lambda))
- (let ((lambda-list (cadr expr))
- (body (cddr expr)))
- (with-checked-bindings ((bindings-from-ll lambda-list) env call-stack)
- (dolist (form body)
- (walk/case form env (cons form call-stack))))))
- ((cons (eql multiple-value-bind))
- (let ((lambda-list (cadr expr))
- (value-form (caddr expr))
- (body (cdddr expr)))
- (walk/case value-form env (cons value-form call-stack))
- (with-checked-bindings ((bindings-from-ll lambda-list) env call-stack)
- (dolist (form body)
- (walk/case form env (cons form call-stack))))))
- ((cons (eql macrolet)))
- ((cons (eql flet)))
- ((cons (eql labels)))
- ((cons (eql symbol-macrolet)))
- ((cons (eql if)))
- ((cons (eql progn)))
- ((cons (eql tagbody)))
- ((cons (eql return-from)))
- ((cons (eql multiple-value-call)))
- ((cons (eql block)))
- ((cons (eql catch)))
- ((cons (eql throw)))
- ((cons (eql let))
- (with-checked-bindings ((mapcar (lambda (x) (walk/case (cadr x) env (cons (cadr x) call-stack)) (cons (car x) (make-instance 'binding))) (cadr expr)) env call-stack)
- (dolist (form (cddr expr))
- (walk/case form env (cons form call-stack)))))
- (cons
- (let ((cs (cons expr call-stack)))
- (when (consp (car expr))
- (walk/case (car expr) env cs))
- (dolist (e (cdr expr))
- (walk/case e env (cons e cs)))))
- (t)))
-
-(defgeneric walk/meth (expr env call-stack))
-
-(defmethod walk/meth ((expr symbol) env call-stack)
- (if (constantp expr)
- nil
- (let ((binding (find-binding env expr)))
- (if binding
- (setf (used binding) t)
- (warn 'unbound-variable-referenced :name expr
- :env env :call-stack call-stack)))))
-(defmethod walk/meth ((expr t) env call-stack)
- nil)
-
-(defmethod walk/meth ((expr cons) env call-stack)
- (typecase expr
- ((cons (eql lambda))
- (let ((lambda-list (cadr expr))
- (body (cddr expr)))
- (with-checked-bindings ((bindings-from-ll lambda-list) env call-stack)
- (dolist (form body)
- (walk/meth form env (cons form call-stack))))))
- ((cons (eql multiple-value-bind))
- (let ((lambda-list (cadr expr))
- (value-form (caddr expr))
- (body (cdddr expr)))
- (walk/meth value-form env (cons value-form call-stack))
- (with-checked-bindings ((bindings-from-ll lambda-list) env call-stack)
- (dolist (form body)
- (walk/meth form env (cons form call-stack))))))
- ((cons (eql macrolet)))
- ((cons (eql flet)))
- ((cons (eql labels)))
- ((cons (eql symbol-macrolet)))
- ((cons (eql if)))
- ((cons (eql progn)))
- ((cons (eql tagbody)))
- ((cons (eql return-from)))
- ((cons (eql multiple-value-call)))
- ((cons (eql block)))
- ((cons (eql catch)))
- ((cons (eql throw)))
- ((cons (eql let))
- (with-checked-bindings ((mapcar (lambda (x) (walk/meth (cadr x) env (cons (cadr x) call-stack)) (cons (car x) (make-instance 'binding))) (cadr expr)) env call-stack)
- (dolist (form (cddr expr))
- (walk/meth form env (cons form call-stack)))))
- (t
- (let ((cs (cons expr call-stack)))
- (when (consp (car expr))
- (walk/meth (car expr) env cs))
- (dolist (e (cdr expr))
- (walk/meth e env (cons e cs)))))))
projects / specializable.git / blobdiff