(defpackage "SB-EVAL2" (:use "COMMON-LISP") (:shadow "EVAL" "LOAD") (:export "EVAL" "LOAD")) (in-package "SB-EVAL2") ;;(declaim (optimize (debug 3) (space 0) (speed 0) (safety 3) (compilation-speed 0))) (declaim (optimize (debug 0) (space 0) (speed 3) (safety 0) (compilation-speed 0))) (defconstant +stack-max+ 8) (defmacro specialize (var value possible-values &body body) `(ecase ,value ,@(loop for x in (cl:eval possible-values) collect `((,x) ,(cl:eval `(let ((,var ,x)) ,@body)))))) (declaim (inline %make-environment)) (defstruct (environment (:constructor %make-environment)) (parent nil :type (or null environment)) (data nil :type (or null simple-vector))) (declaim (inline make-null-environment)) (defun make-null-environment () (make-environment nil 0)) (declaim (inline make-environment)) (defun make-environment (parent &optional (size 0) &aux (data (unless (zerop (the fixnum size)) (make-array (list size))))) (%make-environment :parent parent :data data)) (defmacro with-dynamic-extent-environment ((var parent size) &body body) (let ((data% (gensym)) (size% (gensym))) `(let* ((,size% ,size) (,data% (make-array (list ,size%))) (,var (%make-environment :parent ,parent :data ,data%))) (declare (type (mod #.(1+ +stack-max+)) ,size%) ;; we must not allocate environment objects on the ;; stack unless we can be sure that all child ;; environments will also be allocated on the stack, ;; but we can't really know that. ;(dynamic-extent ,var) (dynamic-extent ,data%)) ,@body))) (defclass lexical () ((name :accessor lexical-name :initarg :name :type (or symbol list)))) (defclass env-lexical (lexical) ((offset :accessor lexical-offset :initarg :offset :type fixnum) (nesting :accessor lexical-nesting :initarg :nesting :type fixnum))) (defun make-env-lexical (name offset &optional (nesting -1)) (make-instance 'env-lexical :name name :offset offset :nesting nesting)) (defun lexical-with-nesting (lexical nesting) (make-env-lexical (lexical-name lexical) (lexical-offset lexical) nesting)) (defun maybe-references-p/env (form vars env) ;; Use `(function ,name) for local functions. ;; ;; FIXME: This doesn't do macro expansion, so it's probably ;; incorrect. (let ((sb-walker::*walk-form-expand-macros-p* t)) (sb-walker:walk-form form env (lambda (x ctx env) (declare (ignore ctx)) (when (and (member x vars :test #'equal) (not (sb-walker:var-special-p x env)) (not (sb-walker:var-lexical-p x env))) (return-from maybe-references-p/env t)) x))) nil) (defun maybe-closes-over-p (context form vars) (handler-case (maybe-closes-over-p/env form vars (context->native-environment context)) (serious-condition () t))) (defun maybe-closes-over-p/env (form vars env) (let ((sb-walker::*walk-form-expand-macros-p* t)) (sb-walker:walk-form form env (lambda (x ctx env) (declare (ignore ctx)) (typecase x (cons (destructuring-bind (a . b) x (case a ((lambda) (when (maybe-references-p/env form vars env) (return-from maybe-closes-over-p/env t))) ((flet labels) (typecase b (cons (destructuring-bind (bindings . rest) form (when (or (maybe-references-p/env bindings vars env) (maybe-closes-over-p/env rest vars env)) (return-from maybe-closes-over-p/env t)))) (t (when (maybe-closes-over-p/env b vars env) (return-from maybe-closes-over-p/env t))))))))) x))) nil) (defstruct (context (:constructor make-context (&optional parent))) parent (env-hop nil :type boolean) (block-tags nil :type list) (go-tags nil :type list) (symbol-macros nil :type list) (macros nil :type list) (lexicals nil :type list) (specials nil :type list)) (defun make-null-context () (make-context nil)) (defun context-add-block-tag (context block tag) (let ((new-context (make-context context))) (with-slots (block-tags) new-context (setq block-tags (acons block tag block-tags))) new-context)) (defun context-block-tag (context block) (let ((parent (context-parent context))) (or (cdr (assoc (the symbol block) (context-block-tags context))) (and parent (context-block-tag parent block))))) (defun context-add-go-tags (context new-go-tags catch-tag) (let ((new-context (make-context context))) (with-slots (go-tags) new-context (dolist (new-go-tag new-go-tags) (setq go-tags (acons new-go-tag catch-tag go-tags)))) new-context)) (defun context-collect (context f) (let ((parent (context-parent context))) (append (funcall f context) (and parent (context-collect parent f))))) (defun context-find-go-tag (context go-tag) (let ((parent (context-parent context))) (or (cdr (assoc (the atom go-tag) (context-go-tags context))) (and parent (context-find-go-tag parent go-tag))))) (defun context-find-symbol-macro (context symmac) (let ((parent (context-parent context))) (or (cdr (assoc (the symbol symmac) (context-symbol-macros context))) (and parent (context-find-symbol-macro parent symmac))))) (defun context-find-macro (context mac) (let ((parent (context-parent context))) (and (not (member `(function ,mac) (context-lexicals context) :test #'equal :key #'lexical-name)) (or (cdr (assoc (the (or symbol list) mac) (context-macros context) :test #'equal)) (and parent (context-find-macro parent mac)))))) (defun context-add-symbol-macros (context bindings) (let ((new-context (make-context context))) (with-slots (symbol-macros) new-context (setq symbol-macros (append bindings symbol-macros))) new-context)) (defun context-add-macros (context bindings) (let ((new-context (make-context context))) (with-slots (macros) new-context (setq macros (append bindings macros))) new-context)) (defun parse-tagbody-tags-and-bodies (forms) (let ((next-form (gensym)) (finishp nil)) (loop until finishp collect (progn (unless forms (setq finishp (null forms))) (let ((tag next-form) (current-forms (loop for current-form = (pop forms) do (setq next-form current-form) until (atom current-form) collect current-form))) (cons tag current-forms)))))) (defun context-var-symbol-macro-p (context var) (and (not (find var (context-specials context) :test #'equal)) (not (find var (context-lexicals context) :key #'lexical-name :test #'equal)) (or (find var (context-symbol-macros context) :key #'car :test #'equal) (and (context-parent context) (context-var-symbol-macro-p (context-parent context) var))))) (defun context-var-lexical-p (context var) (and (not (find var (context-specials context) :test #'equal)) (not (find var (context-symbol-macros context) :key #'car :test #'equal)) (or (find var (context-lexicals context) :key #'lexical-name :test #'equal) (and (context-parent context) (context-var-lexical-p (context-parent context) var))))) (defun context-var-special-p (context var) (and (not (find var (context-lexicals context) :key #'lexical-name :test #'equal)) (not (find var (context-symbol-macros context) :key #'car :test #'equal)) (or (find var (context-specials context) :test #'equal) (and (context-parent context) (context-var-special-p (context-parent context) var))))) (defun context-add-env-lexicals (context vars) ;; open a new variable context (let ((new-context (make-context context))) (with-slots (lexicals env-hop) new-context (setq env-hop t) (setq lexicals (loop for i fixnum from 0 for v in vars collect (make-env-lexical v i)))) new-context)) (defun make-lexical-context (context) (let ((new-context (make-context context))) (setf (context-env-hop new-context) t) new-context)) (defun context-add-env-lexical! (context var) (with-slots (lexicals) context (push (make-env-lexical var (length lexicals)) lexicals)) (values)) (defun context-add-specials (context vars) (let ((new-context (make-context context))) (setf (context-specials new-context) vars) new-context)) (defun context-add-special! (context var) (with-slots (specials) context (push var specials)) (values)) (defun context-add-env-functions (context fs) (context-add-env-lexicals context (mapcar (lambda (x) `(function ,x)) fs))) (defun context-find-lexical (context var) (loop with env-level = 0 until (null context) for record = (find var (context-lexicals context) :key #'lexical-name :test #'equal) when record do (return (etypecase record (env-lexical (lexical-with-nesting record env-level)))) when (context-env-hop context) do (incf env-level) do (setq context (context-parent context)))) (deftype eval-closure () `(function (environment) *)) (declaim (inline environment-value)) (defun environment-value (env nesting offset) (dotimes (i (the fixnum nesting)) (setq env (environment-parent env))) (svref (environment-data env) offset)) (declaim (inline (setf environment-value))) (defun (setf environment-value) (val env nesting offset) (dotimes (i (the fixnum nesting)) (setq env (environment-parent env))) (setf (svref (environment-data env) offset) val)) (declaim (ftype (function (symbol context) eval-closure) prepare-ref)) (defun prepare-ref (var context) (if (context-var-lexical-p context var) (let* ((lexical (context-find-lexical context var)) (nesting (lexical-nesting lexical)) (offset (lexical-offset lexical))) (etypecase lexical (env-lexical (lambda (env) (environment-value env nesting offset))))) (lambda (env) (declare (ignore env)) (symbol-value var)))) (defun body-decls&forms (exprs) (let* ((decl-exprs (loop while (and (consp (first exprs)) (eq 'declare (first (first exprs)))) for expr = (pop exprs) collect expr)) (decls (mapcan #'rest decl-exprs))) (values decls exprs))) (defun decl-specials (declaration) (when (eq (first declaration) 'special) (rest declaration))) (defmacro with-parsed-body ((forms-var specials-var) exprs &body body) (let ((decls (gensym))) `(multiple-value-bind (,decls ,forms-var) (body-decls&forms ,exprs) (let ((,specials-var (mapcan #'decl-specials ,decls))) ,@body)))) (declaim (ftype (function ((or symbol list) context) eval-closure) prepare-function-ref)) (defun prepare-function-ref (function-name context) (if (context-var-lexical-p context `(function ,function-name)) (let* ((lexical (context-find-lexical context `(function ,function-name))) (nesting (lexical-nesting lexical)) (offset (lexical-offset lexical))) (lambda (env) (environment-value env nesting offset))) (let ((f* (sb-c::fdefinition-object function-name t))) (lambda (env) (declare (ignore env)) (or (sb-c::fdefn-fun f*) (error 'undefined-function :name function-name)))))) (declaim (ftype (function (context (or symbol list)) *) context-find-function)) (defun context-find-function (context f) (context-find-lexical context `(function ,f))) (declaim (ftype (function (context (or symbol list)) *) local-function-p)) (defun local-function-p (context f) (context-find-function context f)) (declaim (ftype (function () eval-closure) prepare-nil)) (defun prepare-nil () (lambda (env) (declare (ignore env)))) (declaim (ftype (function ((or symbol list) list context) eval-closure) prepare-local-call)) (defun prepare-local-call (f args context) (let* ((args* (mapcar (lambda (form) (prepare-form form context)) args)) (flex (context-find-function context f)) (offset (lexical-offset flex)) (nesting (lexical-nesting flex))) (if (< (length args) 20) (specialize m% (length args) (loop for i from 0 below 20 collect i) (let ((argvars (loop for i from 0 below m% collect (gensym (format nil "ARG~D-" i))))) `(let ,(loop for var in argvars for i from 0 below m% collect `(,var (nth ,i args*))) (lambda (env) (funcall (the function (environment-value env nesting offset)) ,@(loop for var in argvars collect `(funcall (the eval-closure ,var) env))))))) (lambda (env) (apply (the function (environment-value env nesting offset)) (mapcar (lambda (x) (funcall (the eval-closure x) env)) args*)))))) (declaim (ftype (function ((or symbol list) list context) eval-closure) prepare-global-call)) (defun prepare-global-call (f args context) (let ((args* (mapcar (lambda (form) (prepare-form form context)) args)) (f* (sb-c::fdefinition-object f t))) (if (< (length args) 20) (specialize m% (length args) (loop for i from 0 below 20 collect i) (let ((argvars (loop for i from 0 below m% collect (gensym (format nil "ARG~D-" i))))) `(let ,(loop for var in argvars for i from 0 below m% collect `(,var (nth ,i args*))) (lambda (env) (declare (ignorable env)) (funcall (or (sb-c::fdefn-fun f*) (error 'undefined-function :name f)) ,@(loop for var in argvars collect `(funcall (the eval-closure ,var) env))))))) (lambda (env) (apply (or (sb-c::fdefn-fun f*) (error 'undefined-function :name f)) (mapcar (lambda (x) (funcall (the eval-closure x) env)) args*)))))) (declaim (ftype (function (eval-closure list context) eval-closure) prepare-direct-call)) (defun prepare-direct-call (f args context) (let ((args* (mapcar (lambda (form) (prepare-form form context)) args))) (lambda (env) (apply (the (or symbol function) (funcall (the eval-closure f) env)) (mapcar (lambda (x) (funcall (the eval-closure x) env)) args*))))) (declaim (ftype (function (list context) (values eval-closure &rest nil)) prepare-progn)) (defun prepare-progn (forms context) (let ((body* (mapcar (lambda (form) (prepare-form form context)) forms))) (if (null body*) (prepare-nil) (let ((forms* (butlast body*)) (last-form* (first (last body*)))) (lambda (env) (dolist (form* forms*) (funcall (the eval-closure form*) env)) (funcall (the eval-closure last-form*) env)))))) (defun lambda-binding-vars (entry) (etypecase entry (cons (list (etypecase (first entry) (cons (second (first entry))) (symbol (first entry))) (if (cddr entry) (third entry) (gensym)))) (symbol (list entry (gensym))))) (defun lambda-binding-main-var (entry) (etypecase entry (cons (etypecase (first entry) (cons (second (first entry))) (symbol (first entry)))) (symbol entry))) (defun lambda-simple-binding-vars (entry) (etypecase entry (cons (list (first entry))) (symbol (list entry)))) (defun lambda-binding-default (entry) (etypecase entry (cons (second entry)) (symbol nil))) (defun lambda-key (entry) (flet ((keywordify (sym) (intern (symbol-name sym) "KEYWORD"))) (etypecase entry (cons (etypecase (first entry) (cons (first (first entry))) (symbol (keywordify (first entry))))) (symbol (keywordify entry))))) (declaim (ftype (function * eval-closure) prepare-macro-lambda)) (defun prepare-macro-lambda (name lambda-form context) (destructuring-bind (lambda-list &rest body) lambda-form (let* ((whole (gensym "WHOLE")) (env (gensym "ENV")) (body-form (sb-kernel:parse-defmacro lambda-list whole body name 'macrolet :environment env))) (prepare-lambda `((,whole ,env) ,body-form) context ;;:name name )))) (defmacro incff (x &optional (num 1)) (let ((old-x (gensym))) `(let ((,old-x ,x)) (incf ,x ,num) ,old-x))) (defmacro nlet (loop-var bindings &body body) `(labels ((,loop-var ,(mapcar #'first bindings) ,@body)) (,loop-var ,@(mapcar #'second bindings)))) (declaim (ftype (function * eval-closure) prepare-lambda)) (defun prepare-lambda (lambda-form context &key (name nil namep)) (destructuring-bind (lambda-list &rest exprs) lambda-form (with-parsed-body (body specials) exprs (multiple-value-bind (required optional restp rest keyp keys allowp auxp aux morep more-context more-count) (sb-int:parse-lambda-list lambda-list) (declare (ignore more-context more-count)) (declare (ignorable auxp)) (when morep (error "The interpreter does not support the lambda-list keyword ~S" 'sb-int:&more)) (let* ((argvars (append required (mapcan #'lambda-binding-vars optional) (and restp (list rest)) (mapcan #'lambda-binding-vars keys) (mapcan #'lambda-simple-binding-vars aux))) (keywords (mapcar #'lambda-key keys)) (required-num (length required)) (optional-num (length optional)) (key-num (length keys)) (aux-num (length aux)) (default-values (append (mapcar #'lambda-binding-default optional) (mapcar #'lambda-binding-default keys) (mapcar #'lambda-binding-default aux))) (new-context (make-lexical-context context)) (varspecs (list)) (varnum 0) (default-values* (flet ((register-var (var) (if (or (member var specials :test #'eq) (globally-special-p var)) (progn (context-add-special! new-context var) (push (cons :special var) varspecs)) (progn (context-add-env-lexical! new-context var) (push :lexical varspecs) (incf (the fixnum varnum)))))) (mapc #'register-var required) (flet ((process-bindings (bindings) (loop for binding in bindings for default-value = (lambda-binding-default binding) for vars = (lambda-binding-vars binding) collect (prepare-form default-value new-context) do (mapc #'register-var vars)))) (append (process-bindings optional) (progn (when restp (register-var rest)) '()) (process-bindings keys) (process-bindings aux))))) (envp (or (> varnum +stack-max+) (maybe-closes-over-p context `(progn ,@body) argvars) (some (lambda (x) (maybe-closes-over-p context x argvars)) default-values))) (body-context (context-add-specials new-context specials)) (body* (if (and namep (symbolp name)) (prepare-form `(block ,name ,@body) body-context) (prepare-progn body body-context))) (unbound (gensym))) (setq varspecs (nreverse varspecs)) (flet ((handle-arguments (new-env &rest args) ;;(declare (dynamic-extent args)) ;; All this ELT and LENGTH stuff is not as ;; inefficient as it looks. SBCL transforms ;; &rest into &more here. (nlet iter ((rest (when (or restp keyp) (loop for i from (+ required-num optional-num) below (length args) collect (elt args i)))) (restnum (- (length args) (+ required-num optional-num))) (keys-checked-p nil) (my-default-values* default-values*) (my-keywords keywords) (my-varspecs varspecs) (argi 0) ;how many actual arguments have ;been processed (vari 0) ;how many lexical vars have been ;bound (i 0)) ;how many formal arguments have ;been processed (declare (fixnum restnum argi vari i)) (flet ((push-args (&rest values) ;; Push VALUES onto the ;; environment. (incf i) (dolist (value values) (let ((varspec (pop my-varspecs))) (if (eq varspec :lexical) (setf (environment-value new-env 0 (incff vari)) value) (let ((var (cdr varspec))) (assert (eq :special (car varspec)) (varspec)) (return-from iter (progv (list var) (list value) (iter rest restnum keys-checked-p my-default-values* my-keywords my-varspecs argi vari i))))))))) (declare (inline push-args)) (prog () positional (when (>= argi (length args)) (go missing-optionals)) (when (>= argi (the fixnum (+ required-num optional-num))) (go rest)) (if (>= argi required-num) (progn (pop my-default-values*) (push-args (elt args (incff argi)) t)) (push-args (elt args (incff argi)))) (go positional) missing-optionals (unless (>= argi required-num) (error 'sb-int:simple-program-error :format-control "invalid number of arguments: ~D" :format-arguments (list (length args)))) (when (>= i (the fixnum (+ required-num optional-num))) (go rest)) (let ((val* (pop my-default-values*))) (push-args (funcall (the eval-closure val*) new-env) nil)) (go missing-optionals) rest (when (>= i (the fixnum (+ (if restp 1 0) (the fixnum (+ required-num optional-num))))) (go keys)) (when restp (push-args rest)) keys (unless keyp (unless (or restp (= argi (length args))) (error 'sb-int:simple-program-error :format-control "invalid number of arguments: ~D" :format-arguments (list (length args)))) (go aux)) (unless (evenp restnum) (error 'sb-int:simple-program-error :format-control "odd number of keyword arguments: ~D" :format-arguments (list rest))) (when (>= i (the fixnum (+ (if restp 1 0) (the fixnum (+ required-num (the fixnum (+ optional-num key-num))))))) (unless (or keys-checked-p allowp (getf rest :allow-other-keys nil)) (loop for (k v) on rest by #'cddr unless (or (eq k :allow-other-keys) (member k keywords :test #'eq)) do (error 'sb-int:simple-program-error :format-control "unknown &KEY argument: ~A" :format-arguments (list k))) (setq keys-checked-p t)) (go aux)) (let* ((key (the symbol (pop my-keywords))) (val* (pop my-default-values*)) (x (getf rest key unbound))) (if (eq unbound x) (progn (push-args (funcall (the eval-closure val*) new-env) nil)) (progn (push-args x t)))) (go keys) aux (when (>= i (+ (if restp 1 0) (the fixnum (+ required-num (the fixnum (+ optional-num key-num)) aux-num)))) (go final-call)) (let ((val* (pop my-default-values*))) (push-args (funcall (the eval-closure val*) new-env))) (go aux) final-call (assert (null my-default-values*) (my-default-values*)) (return (funcall body* new-env))))))) ;;(declare (inline handle-arguments)) ;crashes the compiler! lp#1203260 (if envp (lambda (env) (lambda (&rest args) (declare (dynamic-extent args)) (let ((new-env (make-environment env varnum))) (apply #'handle-arguments new-env args)))) (lambda (env) (lambda (&rest args) (declare (dynamic-extent args)) (with-dynamic-extent-environment (new-env env varnum) (apply #'handle-arguments new-env args))))))))))) (defun context->native-environment (context) (let ((functions (loop for (name . expander) in (context-collect context 'context-macros) collect `(,name . (sb-c::macro . ,expander)))) (vars (loop for (name . form) in (context-collect context 'context-symbol-macros) collect `(,name . (sb-c::macro . ,form))))) (sb-c::internal-make-lexenv functions vars nil nil nil nil nil nil nil nil nil))) (defun native-environment->context (lexenv) (with-accessors ((functions sb-c::lexenv-funs) (vars sb-c::lexenv-vars)) lexenv (let ((context (make-context nil)) (macros% (loop for (name . functional) in vars when (eq (car functional) 'sb-c::macro) collect `(,name . ,(cdr functional)))) (symbol-macros% (loop for (name . form) in functions when (eq (car form) 'sb-c::macro) collect `(,name . ,(cdr form))))) (with-slots (macros symbol-macros) context (setq macros macros%) (setq symbol-macros symbol-macros%)) context))) (defun globally-special-p (var) (eq :special (sb-int:info :variable :kind var))) (defun assume-special (context var) (unless (context-var-special-p context var) (warn 'simple-warning :format-control "Undefined variable: ~S" :format-arguments (list var)))) (declaim (ftype (function (* context) eval-closure) prepare-form)) (defun prepare-form (form context) ;;(declare (optimize speed (safety 0) (space 1) (debug 0))) ;;(print form) (values (cond ((sb-int:self-evaluating-p form) (lambda (env) (declare (ignore env)) form)) (t (etypecase form (symbol (let ((macro? (context-find-symbol-macro context form))) (if macro? (prepare-form macro? context) (prepare-ref form context)))) (cons (case (first form) ((if) (destructuring-bind (a b &optional c) (rest form) (let ((a* (prepare-form a context)) (b* (prepare-form b context)) (c* (prepare-form c context))) (lambda (env) (if (funcall a* env) (funcall b* env) (funcall c* env)))))) ((function) (let ((fun-form (second form))) (etypecase fun-form (symbol (prepare-function-ref fun-form context)) (cons (ecase (first fun-form) ((lambda) (prepare-lambda (rest fun-form) context)) ((sb-int:named-lambda) (prepare-lambda (cddr fun-form) context)) ((setf) (prepare-function-ref fun-form context))))))) ((lambda) (prepare-lambda (rest form) context)) ((setq) (let ((binding-forms (rest form))) (let ((bindings (loop for (var valform) on binding-forms by #'cddr collect var collect (cond ((context-var-symbol-macro-p context var) (let ((form (context-find-symbol-macro context var))) (prepare-form `(setf ,form ,valform) context))) ((context-var-lexical-p context var) (context-find-lexical context var)) (t (assume-special context var) :special)) collect (prepare-form valform context)))) (lambda (env) (loop for (var info val*) on bindings by #'cdddr for value = (funcall (the eval-closure val*) env) for result = (progn (etypecase info (function ;symbol macro setter (funcall info env)) (lexical (setf (environment-value env (lexical-nesting info) (lexical-offset info)) value)) (keyword (setf (symbol-value var) value)))) finally (return result)))))) ((catch) (destructuring-bind (tag &body body) (rest form) (let ((tag* (prepare-form tag context)) (body* (prepare-progn body context))) (lambda (env) (catch (funcall tag* env) (funcall body* env)))))) ((block) (destructuring-bind (name &body body) (rest form) (let* ((tag (gensym (concatenate 'string "BLOCK-" (symbol-name name)))) (body* (prepare-progn body (context-add-block-tag context name tag)))) (lambda (env) (catch tag (funcall body* env)))))) ((declare) ;;FIXME (prepare-nil)) ((eval-when) (destructuring-bind ((&rest times) &body body) (rest form) (if (or (member :load-toplevel times) (member :execute times) (member 'load times) (member 'eval times)) (prepare-progn body context) (prepare-nil)))) ((flet) (destructuring-bind (bindings &rest exprs) (rest form) (with-parsed-body (body specials) exprs (let* ((bindings* (mapcar (lambda (form) (if (listp form) (cons (first form) (prepare-lambda (rest form) context :name (first form))) (cons form (prepare-nil)))) bindings)) (new-context (context-add-env-functions context (mapcar #'first bindings*))) (functions (mapcar #'cdr bindings*)) (n (length functions)) (body* (prepare-progn body (context-add-specials new-context specials)))) (lambda (env) (let ((new-env (make-environment env n))) (loop for i from 0 to n for f in functions do (setf (environment-value new-env 0 i) (funcall (the eval-closure f) env))) (funcall body* new-env))))))) ((labels) (destructuring-bind (bindings &rest exprs) (rest form) (with-parsed-body (body specials) exprs (let* ((new-context (context-add-env-functions context (mapcar #'first bindings))) (bindings* (mapcar (lambda (form) (if (listp form) (cons (first form) (prepare-lambda (rest form) new-context :name (first form))) (cons form (prepare-nil)))) bindings)) (functions (mapcar #'cdr bindings*)) (n (length functions)) (body* (prepare-progn body (context-add-specials new-context specials)))) (lambda (env) (let ((new-env (make-environment env n))) (loop for i from 0 to n for f in functions do (setf (environment-value new-env 0 i) (funcall (the eval-closure f) new-env))) (funcall body* new-env))))))) ((let) (destructuring-bind (bindings &rest exprs) (rest form) (with-parsed-body (body specials) exprs (let* ((real-bindings (mapcar (lambda (form) (if (listp form) (cons (first form) (second form)) (cons form nil))) bindings)) (vars (mapcar #'car real-bindings)) (varnum (length vars)) (envp (or (> varnum +stack-max+) (maybe-closes-over-p context `(progn ,@body) vars))) (new-context (context-add-env-lexicals context (list))) srav-laiceps) (let* ((values* (loop for (var . value-form) in real-bindings for val* = (prepare-form value-form context) if (or (member (the symbol var) specials) (globally-special-p var)) collect (cons t val*) and do (push var srav-laiceps) (context-add-special! new-context var) else collect (cons nil val*) and do (context-add-env-lexical! new-context var))) (body* (prepare-progn body (context-add-specials new-context specials)))) (if envp (lambda (env) (let ((new-env (make-environment env varnum)) (slav-laiceps (list))) (loop with i fixnum = 0 for (specialp . val*) in values* when specialp do (push (funcall (the eval-closure val*) env) slav-laiceps) else do (setf (environment-value new-env 0 i) (funcall (the eval-closure val*) env)) (incf i)) (progv srav-laiceps slav-laiceps (funcall body* new-env)))) (lambda (env) (with-dynamic-extent-environment (new-env env varnum) (let ((slav-laiceps (list))) (loop with i fixnum = 0 for (specialp . val*) in values* when specialp do (push (funcall (the eval-closure val*) env) slav-laiceps) else do (setf (environment-value new-env 0 i) (funcall (the eval-closure val*) env)) (incf i)) (progv srav-laiceps slav-laiceps (funcall body* new-env))))))))))) ((let*) (destructuring-bind (bindings &rest exprs) (rest form) (with-parsed-body (body specials) exprs (labels ((build-nested-let (bindings) (if (null bindings) `(progn ,@body) (let* ((binding-form (first bindings)) (var (if (listp binding-form) (first binding-form) binding-form)) (val (if (listp binding-form) (second binding-form) nil))) `(let ((,var ,val)) (declare (special ,@(if (or (member var specials) (globally-special-p var)) (list var) nil))) ,(build-nested-let (rest bindings))))))) (prepare-form (build-nested-let bindings) context))))) ((load-time-value) (let ((load-form (cadr form))) ;; FIXME (prepare-form load-form context))) ((locally) (destructuring-bind (&rest exprs) (rest form) (with-parsed-body (body specials) exprs (let ((new-context (context-add-specials context specials))) (prepare-progn body new-context))))) ((multiple-value-call) (destructuring-bind (f &rest argforms) (rest form) (let ((f* (prepare-form f context)) (argforms* (mapcar (lambda (x) (prepare-form x context)) argforms))) (lambda (env) (apply (funcall (the eval-closure f*) env) (mapcan (lambda (arg) (multiple-value-list (funcall (the eval-closure arg) env))) argforms*)))))) ((multiple-value-prog1) (destructuring-bind (values-form &body body) (rest form) (let ((values-form* (prepare-form values-form context)) (body* (prepare-progn body context))) (lambda (env) (multiple-value-prog1 (funcall values-form* env) (funcall body* env)))))) ((multiple-value-setq) (destructuring-bind (vars values-form) (rest form) (if vars (prepare-form `(values (setf (values ,@vars) ,values-form)) context) (prepare-form `(values ,values-form) context)))) ((multiple-value-bind) ;; FIXME: SPECIAL declarations! (destructuring-bind (vars value-form &body exprs) (rest form) (with-parsed-body (body specials) exprs (let* ((value-form* (prepare-form value-form context)) (n (length (the list vars))) (new-context (context-add-specials (context-add-env-lexicals context vars) specials)) (body* (prepare-progn body new-context))) (lambda (env) (let* ((new-env (make-environment env n)) (values (multiple-value-list (funcall value-form* env)))) (dotimes (i n) (setf (environment-value new-env 0 i) (pop values))) (funcall body* new-env))))))) ((progn) (prepare-progn (rest form) context)) ((progv) (destructuring-bind (vals vars &body body) (rest form) (let ((vals* (prepare-form vals context)) (vars* (prepare-form vars context)) (body* (prepare-progn body context))) (lambda (env) (progv (funcall vals* env) (funcall vars* env) (funcall body* env)))))) ((quote) (let ((quoted-object (cadr form))) (lambda (env) (declare (ignore env)) quoted-object))) ((return-from) (destructuring-bind (name &optional value) (rest form) (let ((value* (prepare-form value context)) (tag (context-block-tag context name))) (lambda (env) (throw tag (funcall value* env)))))) ((the) (prepare-form (third form) context)) ((throw) (destructuring-bind (tag result) (rest form) (let ((tag* (prepare-form tag context)) (result* (prepare-form result context))) (lambda (env) (throw (funcall tag* env) (funcall result* env)))))) ((unwind-protect) (destructuring-bind (protected &body body) (rest form) (let ((protected* (prepare-form protected context)) (body* (prepare-progn body context))) (lambda (env) (unwind-protect (funcall protected* env) (funcall body* env)))))) ((sb-ext:truly-the) (prepare-form (third form) context)) ((sb-int:named-lambda) (prepare-lambda (cddr form) context)) ((symbol-macrolet) (destructuring-bind (bindings &rest exprs) (rest form) (with-parsed-body (body specials) exprs (let ((bindings (mapcar (lambda (form) (cons (first form) (second form))) bindings))) (prepare-progn body (context-add-specials (context-add-symbol-macros context bindings) specials)))))) ((macrolet) (destructuring-bind (bindings &rest exprs) (rest form) (with-parsed-body (body specials) exprs (let ((bindings (mapcar (lambda (form) (cons (first form) (funcall (prepare-macro-lambda (first form) (rest form) context) (make-null-environment)))) bindings))) (prepare-progn body (context-add-specials (context-add-macros context bindings) specials)))))) ((go) (let* ((go-tag (second form)) (catch-tag (context-find-go-tag context go-tag))) (lambda (env) (declare (ignore env)) (throw catch-tag go-tag)))) ((tagbody) ;; 1. set up catch handler ;; 2. save go-tag -> tagbody-catch-tag mapping (let* ((jump (gensym "JUMP")) (tags-and-bodies (parse-tagbody-tags-and-bodies (rest form))) (new-context (context-add-go-tags context (mapcar #'car tags-and-bodies) jump)) (tags-and-bodies* (mapcar (lambda (x) (destructuring-bind (tag . body) x (cons tag (prepare-progn body new-context)))) tags-and-bodies))) (lambda (env) (block tagbody-loop (let ((code tags-and-bodies*)) (loop (setq code (member (catch jump (dolist (tag-and-body* code) (funcall (the eval-closure (cdr tag-and-body*)) env)) (return-from tagbody-loop)) tags-and-bodies* :key #'car)) (unless code (return-from tagbody-loop))))) nil))) (otherwise ;; FIXME: Handle SETF expanders? (destructuring-bind (f . args) form (check-type f (or list symbol)) (let ((local-macro? (context-find-macro context f)) (global-macro? (and (symbolp f) (macro-function f)))) (cond (local-macro? (let ((macro-function local-macro?)) (prepare-form (funcall (the function macro-function) form (context->native-environment context)) context))) (global-macro? (prepare-form (funcall global-macro? form (context->native-environment context)) context)) ((and (listp f) (eq 'lambda (first f))) (let ((lambda-fn (prepare-lambda (rest f) context))) (prepare-direct-call lambda-fn args context))) (t (if (local-function-p context f) (prepare-local-call f args context) (prepare-global-call f args context)))))))))))) t)) (defun eval (form) (funcall (prepare-form form (make-null-context)) (make-null-environment))) (defun load (filename) ;;FIXME: set :LOAD-TOPLEVEL time. (let ((eof (gensym))) (with-open-file (in filename) (loop for form = (read in nil eof nil) until (eq form eof) do (eval form))))) #+(or) (funcall (prepare-form '(funcall (funcall (lambda (x) (lambda (y z) (setq x (+ x (* y z))) x)) 3) 5 7) (make-null-context)) (make-null-environment)) #+(or) (funcall (funcall (prepare-form '(lambda (a b &optional c (d 10 dp) &rest r &key e (f 12 fp) (g 12 gp) &aux (h 1) (i 2)) (list a b c d dp e f fp g gp r h i))) (make-null-environment)) 1 2 3 4 :f 5 :e 6) ;; => (1 2 3 4 T 6 5 T 12 NIL (:F 5 :E 6) 1 2)