X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Feval.lisp;h=7b3764e51c3e466ce69fa58d34de0eead55ab331;hb=bfe145acc01eb7a43790173db4f08610ae9cb07a;hp=e9721f29059ffb7726c50c63b7c1aba3950fe5a2;hpb=3eb39e017e52b5d704e7d33405c873af52a533fd;p=sbcl.git diff --git a/src/code/eval.lisp b/src/code/eval.lisp index e9721f2..7b3764e 100644 --- a/src/code/eval.lisp +++ b/src/code/eval.lisp @@ -14,11 +14,16 @@ ;;; general case of EVAL (except in that it can't handle toplevel ;;; EVAL-WHEN magic properly): Delegate to #'COMPILE. (defun %eval (expr lexenv) - (funcall (sb!c:compile-in-lexenv - (gensym "EVAL-TMPFUN-") - `(lambda () - ,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 lexenv) @@ -41,6 +46,33 @@ (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)))) + (defun eval (original-exp) #!+sb-doc "Evaluate the argument in a null lexical environment, returning the @@ -52,161 +84,139 @@ (defun eval-in-lexenv (original-exp lexenv) (declare (optimize (safety 1))) ;; (aver (lexenv-simple-p lexenv)) - (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 (or (atom name) - (and (consp name) - (eq (car name) 'setf))) - (not (consp (let ((sb!c:*lexenv* lexenv)) - (sb!c:lexenv-find name funs))))) - (fdefinition 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 (second args)))) - (set (first args) (eval (second args))))) - (let ((symbol (first name))) - (case (info :variable :kind symbol) - ;; FIXME: I took out the *TOPLEVEL-AUTO-DECLARE* - ;; test here, and removed the *TOPLEVEL-AUTO-DECLARE* - ;; variable; the code should now act as though that - ;; variable is NIL. This should be tested.. - (:special) - (t (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) - (multiple-value-bind (body decls) (parse-body (rest exp) 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)) - (sb!c::process-decls decls - nil nil - (sb!c::make-continuation) - lexenv)))) - (eval-progn-body body lexenv)))) - ((macrolet) - (destructuring-bind (definitions &rest body) - (rest exp) - ;; FIXME: shared code with FUNCALL-IN-FOOMACROLET-LEXENV - (declare (type list definitions)) - (unless (= (length definitions) - (length (remove-duplicates definitions :key #'first))) - (style-warn "duplicate definitions in ~S" definitions)) - (let ((lexenv - (sb!c::make-lexenv - :default lexenv - :funs (mapcar - (sb!c::macrolet-definitionize-fun - :eval - ;; I'm not sure that this is the correct - ;; LEXENV to be compiling local macros - ;; in... - lexenv) - definitions)))) - (eval-in-lexenv `(locally ,@body) lexenv)))) - ((symbol-macrolet) - (destructuring-bind (definitions &rest body) - (rest exp) - ;; FIXME: shared code with FUNCALL-IN-FOOMACROLET-LEXENV - (declare (type list definitions)) - (unless (= (length definitions) - (length (remove-duplicates definitions :key #'first))) - (style-warn "duplicate definitions in ~S" definitions)) - (let ((lexenv - (sb!c::make-lexenv - :default lexenv - :vars (mapcar - (sb!c::symbol-macrolet-definitionize-fun - :eval) - definitions)))) - (eval-in-lexenv `(locally ,@body) lexenv)))) - (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 original-exp lexenv)))))) - (t - exp)))) + (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))))) + (fdefinition 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 (second args)))) + (set (first args) (eval (second args))))) + (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