;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
-(in-package "SB!BYTECODE")
-
-;;; Note: This is defined here, but it's visible in SB-KERNEL, since
-;;; various magical things need to happen to it, e.g. initialization
-;;; early in cold load, and save/restore in nonlocal exit logic.
-(defvar *eval-stack-top* 0)
+(in-package "SB!IMPL")
;;; general case of EVAL (except in that it can't handle toplevel
-;;; EVAL-WHEN magic properly): Delegate to the byte compiler.
+;;; EVAL-WHEN magic properly): Delegate to #'COMPILE.
(defun %eval (expr)
(funcall (compile (gensym "EVAL-TMPFUN-")
`(lambda ()
- ;; SPEED=0,DEBUG=1 => byte-compile
- (declare (optimize (speed 0) (debug 1)))
+ ;; 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 than that, basically we care about
- ;; compilation speed, compilation speed, and
- ;; compilation speed. (There are cases where
- ;; the user wants something else, but we don't
- ;; know enough to guess that; and if he is
- ;; unhappy about our guessed emphasis, he
- ;; should explicitly compile his code, with
- ;; explicit declarations to tell us what to
- ;; emphasize.)
- (declare (optimize (space 1) (safety 1)))
- (declare (optimize (compilation-speed 3)))
+ ;; Other properties are relatively unimportant.
+ (declare (optimize (speed 1) (debug 1) (space 1)))
,expr))))
+;;; Handle PROGN and implicit PROGN.
+(defun eval-progn-body (progn-body)
+ (unless (list-with-length-p progn-body)
+ (let ((*print-circle* t))
+ (error 'simple-program-error
+ :format-control
+ "~@<not a proper list in PROGN or implicit PROGN: ~2I~_~S~:>"
+ :format-arguments (list progn-body))))
+ ;; Note:
+ ;; * We can't just use (MAP NIL #'EVAL PROGN-BODY) here, because we
+ ;; need to take care to return all the values of the final EVAL.
+ ;; * It's left as an exercise to the reader to verify that this
+ ;; gives the right result when PROGN-BODY is NIL, because
+ ;; (FIRST NIL) = (REST NIL) = NIL.
+ (do* ((i progn-body rest-i)
+ (rest-i (rest i) (rest i)))
+ (nil)
+ (if rest-i ; if not last element of list
+ (eval (first i))
+ (return (eval (first i))))))
+
;;; 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)
(%eval original-exp))))
(list
(let ((name (first exp))
- (args (1- (length exp))))
+ (n-args (1- (length exp))))
(case name
(function
- (unless (= args 1)
+ (unless (= n-args 1)
(error "wrong number of args to FUNCTION:~% ~S" exp))
(let ((name (second exp)))
(if (or (atom name)
(fdefinition name)
(%eval original-exp))))
(quote
- (unless (= args 1)
+ (unless (= n-args 1)
(error "wrong number of args to QUOTE:~% ~S" exp))
(second exp))
(setq
- (unless (evenp args)
+ (unless (evenp n-args)
(error "odd number of args to SETQ:~% ~S" exp))
- (unless (zerop args)
+ (unless (zerop n-args)
(do ((name (cdr exp) (cddr name)))
((null name)
(do ((args (cdr exp) (cddr args)))
(:special)
(t (return (%eval original-exp))))))))
((progn)
- (when (> args 0)
- (dolist (x (butlast (rest exp)) (eval (car (last exp))))
- (eval x))))
+ (eval-progn-body (rest exp)))
((eval-when)
- (if (and (> args 0)
- (or (member 'eval (second exp))
- (member :execute (second exp))))
- (when (> args 1)
- (dolist (x (butlast (cddr exp)) (eval (car (last exp))))
- (eval x)))
- (%eval original-exp)))
+ ;; 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))
(t
exp))))
-;;; Given a function, return three values:
-;;; 1] A lambda expression that could be used to define the function,
-;;; or NIL if the definition isn't available.
-;;; 2] NIL if the function was definitely defined in a null lexical
-;;; environment, and T otherwise.
-;;; 3] Some object that \"names\" the function. Although this is
-;;; allowed to be any object, CMU CL always returns a valid
-;;; function name or a string.
-;;;
-;;; If interpreted, use the interpreter interface. Otherwise, see
-;;; whether it was compiled with COMPILE. If that fails, check for an
-;;; inline expansion.
(defun function-lambda-expression (fun)
- (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))))
+ "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 (%simple-fun-self fun))
+ (name (%simple-fun-name fun))
+ (code (sb!di::fun-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 (fun-name-inline-expansion name)))
+ (if exp
+ (values exp nil name)
+ (values nil t name))))))
+ (values nil t name))))
\f
;;; miscellaneous full function definitions of things which are
;;; ordinarily handled magically by the compiler
projects / sbcl.git / blobdiff