X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Feval.lisp;h=70bd2eab5ce49f23cd3356fbf0bdadd8da67301d;hb=4099112d8e4687f266922f0e044fba8f17dddcf6;hp=36531a5d3c3e70075b7b2fa8f380a590a0da0fa8;hpb=dec94b039e8ec90baf21463df839a6181de606f6;p=sbcl.git diff --git a/src/code/eval.lisp b/src/code/eval.lisp index 36531a5..70bd2ea 100644 --- a/src/code/eval.lisp +++ b/src/code/eval.lisp @@ -13,29 +13,20 @@ ;;; general case of EVAL (except in that it can't handle toplevel ;;; EVAL-WHEN magic properly): Delegate to #'COMPILE. -(defun %eval (expr) - (funcall (compile (gensym "EVAL-TMPFUN-") - `(lambda () - - ;; The user can reasonably expect that the - ;; interpreter will be safe. - (declare (optimize (safety 3))) - - ;; It's also good if the interpreter doesn't - ;; spend too long thinking about each input - ;; form, since if the user'd wanted the - ;; tradeoff to favor quality of compiled code - ;; over compilation speed, he'd've explicitly - ;; asked for compilation. - (declare (optimize (compilation-speed 2))) - - ;; Other properties are relatively unimportant. - (declare (optimize (speed 1) (debug 1) (space 1))) - - ,expr)))) +(defun %eval (expr lexenv) + ;; FIXME: It might be nice to quieten the toplevel by muffling + ;; warnings generated by this compilation (since we're about to + ;; execute the results irrespective of the warnings). We might want + ;; to be careful about not muffling warnings arising from inner + ;; evaluations/compilations, though [e.g. the ignored variable in + ;; (DEFUN FOO (X) 1)]. -- CSR, 2003-05-13 + (let ((fun (sb!c:compile-in-lexenv (gensym "EVAL-TMPFUN-") + `(lambda () ,expr) + lexenv))) + (funcall fun))) ;;; Handle PROGN and implicit PROGN. -(defun eval-progn-body (progn-body) +(defun eval-progn-body (progn-body lexenv) (unless (list-with-length-p progn-body) (let ((*print-circle* t)) (error 'simple-program-error @@ -52,136 +43,181 @@ (rest-i (rest i) (rest i))) (nil) (if rest-i ; if not last element of list - (eval (first i)) - (return (eval (first i)))))) + (eval-in-lexenv (first i) lexenv) + (return (eval-in-lexenv (first i) lexenv))))) + +(defun eval-locally (exp lexenv &key vars) + (multiple-value-bind (body decls) + (parse-body (rest exp) :doc-string-allowed nil) + (let ((lexenv + ;; KLUDGE: Uh, yeah. I'm not anticipating + ;; winning any prizes for this code, which was + ;; written on a "let's get it to work" basis. + ;; These seem to be the variables that need + ;; bindings for PROCESS-DECLS to work + ;; (*FREE-FUNS* and *FREE-VARS* so that + ;; references to free functions and variables + ;; in the declarations can be noted; + ;; *UNDEFINED-WARNINGS* so that warnings about + ;; undefined things can be accumulated [and + ;; then thrown away, as it happens]). -- CSR, + ;; 2002-10-24 + (let* ((sb!c:*lexenv* lexenv) + (sb!c::*free-funs* (make-hash-table :test 'equal)) + (sb!c::*free-vars* (make-hash-table :test 'eq)) + (sb!c::*undefined-warnings* nil)) + ;; FIXME: VALUES declaration + (sb!c::process-decls decls + vars + nil + lexenv)))) + (eval-progn-body body lexenv)))) -;;; Pick off a few easy cases, and the various top-level EVAL-WHEN -;;; magical cases, and call %EVAL for the rest. (defun eval (original-exp) #!+sb-doc "Evaluate the argument in a null lexical environment, returning the result or results." - (declare (optimize (safety 1))) - (let ((exp (macroexpand original-exp))) - (typecase exp - (symbol - (ecase (info :variable :kind exp) - (:constant - (values (info :variable :constant-value exp))) - ((:special :global) - (symbol-value exp)) - ;; FIXME: This special case here is a symptom of non-ANSI - ;; weirdness in SBCL's ALIEN implementation, which could - ;; cause problems for e.g. code walkers. It'd probably be - ;; good to ANSIfy it by making alien variable accessors into - ;; ordinary forms, e.g. (SB-UNIX:ENV) and (SETF SB-UNIX:ENV), - ;; instead of magical symbols, e.g. plain SB-UNIX:ENV. Then - ;; if the old magical-symbol syntax is to be retained for - ;; compatibility, it can be implemented with - ;; DEFINE-SYMBOL-MACRO, keeping the code walkers happy. - (:alien - (%eval original-exp)))) - (list - (let ((name (first exp)) - (n-args (1- (length exp)))) - (case name - (function - (unless (= n-args 1) - (error "wrong number of args to FUNCTION:~% ~S" exp)) - (let ((name (second exp))) - (if (or (atom name) - (and (consp name) - (eq (car name) 'setf))) - (fdefinition name) - (%eval original-exp)))) - (quote - (unless (= n-args 1) - (error "wrong number of args to QUOTE:~% ~S" exp)) - (second exp)) - (setq - (unless (evenp n-args) - (error "odd number of args to SETQ:~% ~S" exp)) - (unless (zerop n-args) - (do ((name (cdr exp) (cddr name))) - ((null name) - (do ((args (cdr exp) (cddr args))) - ((null (cddr args)) - ;; We duplicate the call to SET so that the - ;; correct value gets returned. - (set (first args) (eval (second args)))) - (set (first args) (eval (second args))))) - (let ((symbol (first name))) - (case (info :variable :kind symbol) - ;; FIXME: I took out the *TOP-LEVEL-AUTO-DECLARE* - ;; test here, and removed the *TOP-LEVEL-AUTO-DECLARE* - ;; variable; the code should now act as though that - ;; variable is NIL. This should be tested.. - (:special) - (t (return (%eval original-exp)))))))) - ((progn) - (eval-progn-body (rest exp))) - ((eval-when) - ;; FIXME: DESTRUCTURING-BIND returns - ;; DEFMACRO-LL-ARG-COUNT-ERROR instead of PROGRAM-ERROR - ;; when there's something wrong with the syntax here (e.g. - ;; missing SITUATIONS). This could be fixed by - ;; hand-crafting clauses to catch and report each - ;; possibility, but it would probably be cleaner to write - ;; a new macro DESTRUCTURING-BIND-PROGRAM-SYNTAX which - ;; does DESTRUCTURING-BIND and promotes any mismatch to - ;; PROGRAM-ERROR, then to use it here and in (probably - ;; dozens of) other places where the same problem arises. - (destructuring-bind (eval-when situations &rest body) exp - (declare (ignore eval-when)) - (multiple-value-bind (ct lt e) - (sb!c:parse-eval-when-situations situations) - ;; CLHS 3.8 - Special Operator EVAL-WHEN: The use of - ;; the situation :EXECUTE (or EVAL) controls whether - ;; evaluation occurs for other EVAL-WHEN forms; that - ;; is, those that are not top level forms, or those in - ;; code processed by EVAL or COMPILE. If the :EXECUTE - ;; situation is specified in such a form, then the - ;; body forms are processed as an implicit PROGN; - ;; otherwise, the EVAL-WHEN form returns NIL. - (declare (ignore ct lt)) - (when e - (eval-progn-body body))))) - (t - (if (and (symbolp name) - (eq (info :function :kind name) :function)) - (collect ((args)) - (dolist (arg (rest exp)) - (args (eval arg))) - (apply (symbol-function name) (args))) - (%eval original-exp)))))) - (t - exp)))) + (with-compilation-unit () + (eval-in-lexenv original-exp (make-null-lexenv)))) -(defun function-lambda-expression (fun) - "Return (VALUES DEFINING-LAMBDA-EXPRESSION CLOSURE-P NAME), where - DEFINING-LAMBDA-EXPRESSION is NIL if unknown, or a suitable argument - to COMPILE otherwise, CLOSURE-P is non-NIL if the function's definition - might have been enclosed in some non-null lexical environment, and - NAME is some name (for debugging only) or NIL if there is no name." - (declare (type function fun)) - (let* ((fun (%function-self fun)) - (name (%function-name fun)) - (code (sb!di::function-code-header fun)) - (info (sb!kernel:%code-debug-info code))) - (if info - (let ((source (first (sb!c::compiled-debug-info-source info)))) - (cond ((and (eq (sb!c::debug-source-from source) :lisp) - (eq (sb!c::debug-source-info source) fun)) - (values (second (svref (sb!c::debug-source-name source) 0)) - nil name)) - ((stringp name) - (values nil t name)) - (t - (let ((exp (info :function :inline-expansion name))) - (if exp - (values exp nil name) - (values nil t name)))))) - (values nil t name)))) +;;; Pick off a few easy cases, and the various top level EVAL-WHEN +;;; magical cases, and call %EVAL for the rest. +(defun eval-in-lexenv (original-exp lexenv) + (declare (optimize (safety 1))) + ;; (aver (lexenv-simple-p lexenv)) + (handler-bind + ((sb!c:compiler-error + (lambda (c) + (if (boundp 'sb!c::*compiler-error-bailout*) + ;; if we're in the compiler, delegate either to a higher + ;; authority or, if that's us, back down to the + ;; outermost compiler handler... + (progn + (signal c) + nil) + ;; ... if we're not in the compiler, better signal the + ;; error straight away. + (invoke-restart 'sb!c::signal-error))))) + (let ((exp (macroexpand original-exp lexenv))) + (typecase exp + (symbol + (ecase (info :variable :kind exp) + (:constant + (values (info :variable :constant-value exp))) + ((:special :global) + (symbol-value exp)) + ;; FIXME: This special case here is a symptom of non-ANSI + ;; weirdness in SBCL's ALIEN implementation, which could + ;; cause problems for e.g. code walkers. It'd probably be + ;; good to ANSIfy it by making alien variable accessors + ;; into ordinary forms, e.g. (SB-UNIX:ENV) and (SETF + ;; SB-UNIX:ENV), instead of magical symbols, e.g. plain + ;; SB-UNIX:ENV. Then if the old magical-symbol syntax is to + ;; be retained for compatibility, it can be implemented + ;; with DEFINE-SYMBOL-MACRO, keeping the code walkers + ;; happy. + (:alien + (%eval original-exp lexenv)))) + (list + (let ((name (first exp)) + (n-args (1- (length exp)))) + (case name + ((function) + (unless (= n-args 1) + (error "wrong number of args to FUNCTION:~% ~S" exp)) + (let ((name (second exp))) + (if (and (legal-fun-name-p name) + (not (consp (let ((sb!c:*lexenv* lexenv)) + (sb!c:lexenv-find name funs))))) + (%coerce-name-to-fun name) + (%eval original-exp lexenv)))) + ((quote) + (unless (= n-args 1) + (error "wrong number of args to QUOTE:~% ~S" exp)) + (second exp)) + (setq + (unless (evenp n-args) + (error "odd number of args to SETQ:~% ~S" exp)) + (unless (zerop n-args) + (do ((name (cdr exp) (cddr name))) + ((null name) + (do ((args (cdr exp) (cddr args))) + ((null (cddr args)) + ;; We duplicate the call to SET so that the + ;; correct value gets returned. + (set (first args) (eval-in-lexenv (second args) lexenv))) + (set (first args) (eval-in-lexenv (second args) lexenv)))) + (let ((symbol (first name))) + (case (info :variable :kind symbol) + (:special) + (t (return (%eval original-exp lexenv)))) + (unless (type= (info :variable :type symbol) + *universal-type*) + ;; let the compiler deal with type checking + (return (%eval original-exp lexenv))))))) + ((progn) + (eval-progn-body (rest exp) lexenv)) + ((eval-when) + ;; FIXME: DESTRUCTURING-BIND returns ARG-COUNT-ERROR + ;; instead of PROGRAM-ERROR when there's something wrong + ;; with the syntax here (e.g. missing SITUATIONS). This + ;; could be fixed by hand-crafting clauses to catch and + ;; report each possibility, but it would probably be + ;; cleaner to write a new macro + ;; DESTRUCTURING-BIND-PROGRAM-SYNTAX which does + ;; DESTRUCTURING-BIND and promotes any mismatch to + ;; PROGRAM-ERROR, then to use it here and in (probably + ;; dozens of) other places where the same problem + ;; arises. + (destructuring-bind (eval-when situations &rest body) exp + (declare (ignore eval-when)) + (multiple-value-bind (ct lt e) + (sb!c:parse-eval-when-situations situations) + ;; CLHS 3.8 - Special Operator EVAL-WHEN: The use of + ;; the situation :EXECUTE (or EVAL) controls whether + ;; evaluation occurs for other EVAL-WHEN forms; that + ;; is, those that are not top level forms, or those + ;; in code processed by EVAL or COMPILE. If the + ;; :EXECUTE situation is specified in such a form, + ;; then the body forms are processed as an implicit + ;; PROGN; otherwise, the EVAL-WHEN form returns NIL. + (declare (ignore ct lt)) + (when e + (eval-progn-body body lexenv))))) + ((locally) + (eval-locally exp lexenv)) + ((macrolet) + (destructuring-bind (definitions &rest body) + (rest exp) + (let ((lexenv + (let ((sb!c:*lexenv* lexenv)) + (sb!c::funcall-in-macrolet-lexenv + definitions + (lambda (&key funs) + (declare (ignore funs)) + sb!c:*lexenv*) + :eval)))) + (eval-locally `(locally ,@body) lexenv)))) + ((symbol-macrolet) + (destructuring-bind (definitions &rest body) (rest exp) + (multiple-value-bind (lexenv vars) + (let ((sb!c:*lexenv* lexenv)) + (sb!c::funcall-in-symbol-macrolet-lexenv + definitions + (lambda (&key vars) + (values sb!c:*lexenv* vars)) + :eval)) + (eval-locally `(locally ,@body) lexenv :vars vars)))) + (t + (if (and (symbolp name) + (eq (info :function :kind name) :function)) + (collect ((args)) + (dolist (arg (rest exp)) + (args (eval-in-lexenv arg lexenv))) + (apply (symbol-function name) (args))) + (%eval exp lexenv)))))) + (t + exp))))) ;;; miscellaneous full function definitions of things which are ;;; ordinarily handled magically by the compiler @@ -210,6 +246,7 @@ (defun values (&rest values) #!+sb-doc "Return all arguments, in order, as values." + (declare (dynamic-extent values)) (values-list values)) (defun values-list (list)