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eval.lisp
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eval.lisp
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;;;;------------------------------------------------------------------
;;;;
;;;; Copyright (C) 2000-2005,
;;;; Department of Computer Science, University of Tromso, Norway
;;;;
;;;; Filename: eval.lisp
;;;; Description:
;;;; Author: Frode Vatvedt Fjeld <frodef@acm.org>
;;;; Created at: Thu Nov 2 17:45:05 2000
;;;; Distribution: See the accompanying file COPYING.
;;;;
;;;; $Id: eval.lisp,v 1.13 2008-04-27 19:17:17 ffjeld Exp $
;;;;
;;;;------------------------------------------------------------------
(in-package movitz)
(defun in-package-form-p (form)
(and (consp form)
(string= '#:in-package (car form))))
(defun require-form-p (form)
(and (consp form)
(string= '#:require (car form))))
(defun provide-form-p (form)
(and (consp form)
(string= '#:provide (car form))))
(defun movitz-module-path (require-form)
"Given a require form, return the path of the file that is expected ~
to provide that module."
(let ((module (second require-form)))
(concatenate 'string
"losp/"
(or (third require-form)
(concatenate 'string
(string-downcase (symbol-name module))
".lisp")))))
(defun movitzify-package-name (name)
(let ((name (string name)))
(if (member name '("cl" "common-lisp" "mop")
:test #'string-equal)
(concatenate 'string (string '#:muerte.) name)
name)))
(defmacro with-retries-until-true ((name format-control &rest format-arguments) &body body)
`(do () (nil)
(with-simple-restart (,name ,format-control ,@format-arguments)
(return (progn ,@body)))))
(defun quote-form-p (x)
(and (consp x)
(or (eq 'cl:quote (first x))
(eq 'muerte.cl::quote (first x)))
t))
(defun movitz-constantp (form &optional (env nil))
(typecase form
(keyword t)
(symbol
(let ((form (translate-program form :cl :muerte.cl)))
(or (movitz-env-get form 'constantp nil env)
(typep (movitz-binding form env) 'constant-object-binding))))
(cons
(let* ((compiler-macro-function (movitz-compiler-macro-function (car form) env))
(compiler-macro-expansion (and compiler-macro-function
(handler-case
(funcall *movitz-macroexpand-hook*
compiler-macro-function
form env)
(error () form)))))
(or (let ((form (translate-program form :cl :muerte.cl)))
(case (car form)
((muerte.cl:quote) t)
((muerte.cl:not)
(movitz-constantp (second form)))
((muerte.cl:+ muerte.cl:- muerte.cl:*)
(every (lambda (sub-form)
(movitz-constantp sub-form env))
(cdr form)))
((muerte.cl:coerce)
(and (= 3 (length form))
(every (lambda (sub-form)
(movitz-constantp sub-form env))
(cdr form))
(not (member (movitz-eval (third form) env)
'(muerte.cl:function)))))))
(and compiler-macro-function
(not (movitz-env-get (car form) 'notinline nil env))
(not (eq form compiler-macro-expansion))
(movitz-constantp compiler-macro-expansion env)))))
(t t))) ; anything else is self-evaluating.
;;;(defun isconst (x)
;;; (or (integerp x)
;;; (stringp x)
;;; (eq t x)
;;; (eq nil x)
;;; (quote-form-p x)))
(defun eval-form (&rest args)
(apply 'movitz-eval args))
(defun movitz-eval (form &optional env top-level-p)
"3.1.2.1 Form Evaluation"
(let ((form (translate-program form :cl :muerte.cl)))
(typecase form
(symbol (eval-symbol form env top-level-p))
(cons (eval-cons form env top-level-p))
(t (eval-self-evaluating form env top-level-p)))))
(defun eval-form-or-error (form env error-value)
(handler-case (eval-form form env)
(error () error-value)))
(defun eval-symbol (form env top-level-p)
"3.1.2.1.1 Symbols as Forms"
(declare (ignore top-level-p))
(cond
((keywordp form)
(eval-self-evaluating form env top-level-p))
((typep (movitz-binding form env) 'constant-object-binding)
(translate-program (movitz-print (constant-object (movitz-binding form env)))
:cl :muerte.cl))
((movitz-constantp form env)
(symbol-value form))
;;; ((movitz-lexical-binding form env)
;;; (eval-lexical-variable form env top-level-p))
(t (error "Don't know how to eval symbol-form ~S" form))))
(defun eval-self-evaluating (form env top-level-p)
"3.1.2.1.3 Self-Evaluating Objects"
(declare (ignore env top-level-p))
form)
(defun eval-cons (form env top-level-p)
"3.1.2.1.2 Conses as Forms"
(let* ((operator (car form))
(compiler-macro-function (movitz-compiler-macro-function operator env))
(compiler-macro-expansion (and compiler-macro-function
(funcall *movitz-macroexpand-hook*
compiler-macro-function
form env))))
(cond
;;; ((movitz-constantp form env)
;;; (eval-constant-compound form env top-level-p))
((member operator '(cl:quote muerte.cl::quote))
(eval-self-evaluating (second form) env top-level-p))
((member operator '(muerte.cl::not))
(not (eval-form (second form) env nil)))
((member operator '(muerte.cl:+ muerte.cl:- muerte.cl:*))
(apply (translate-program (car form) :muerte.cl :cl)
(mapcar (lambda (sub-form)
(movitz-eval sub-form env nil))
(cdr form))))
((member operator '(muerte.cl:coerce muerte.cl:make-hash-table))
(apply (translate-program operator :muerte.cl :cl)
(mapcar (lambda (arg)
(translate-program (movitz-eval arg env nil) :muerte.cl :cl))
(cdr form))))
((and compiler-macro-function
(not (movitz-env-get (car form) 'notinline nil env))
(not (eq form compiler-macro-expansion)))
(movitz-eval compiler-macro-expansion env top-level-p))
;;; ((lambda-form-p form)
;;; (eval-lambda-form form env top-level-p))
;;; ((symbolp operator)
;;; (cond
;;; ((movitz-special-operator-p operator)
;;; (eval-special-operator form env top-level-p))
;;; ((movitz-macro-function operator env)
;;; (eval-macro-form form env top-level-p))
;;; (t (eval-apply-symbol form env top-level-p))))
(t (case (car form)
(muerte.cl::function
(if (symbolp (second form))
(movitz-env-symbol-function (second form) env)
(error "Don't know how to eval function form ~A." form)))
(t (error "Don't know how to eval compound form ~A" form)))))))
(defun eval-constant-compound (form env top-level-p)
(case (car form)
((cl:quote muerte.cl::quote)
(eval-self-evaluating (second form) env top-level-p))
(muerte.cl::not
(not (eval-form (second form) env nil)))
((muerte.cl:+ muerte.cl:- muerte.cl:*)
(apply (translate-program (car form) :muerte.cl :cl)
(mapcar (lambda (sub-form)
(movitz-eval sub-form env nil))
(cdr form))))
((muerte.cl:coerce)
(apply #'coerce
(mapcar (lambda (arg) (movitz-eval arg env nil))
(cdr form))))
(t (error "Don't know how to compile constant compound form ~A" form))))