+;;; magical cases, and call %SIMPLE-EVAL for the rest.
+(defun simple-eval-in-lexenv (original-exp lexenv)
+ (declare (optimize (safety 1)))
+ ;; (aver (lexenv-simple-p lexenv))
+ (incf *eval-calls*)
+ (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)))
+ (handler-bind ((eval-error
+ (lambda (condition)
+ (error 'interpreted-program-error
+ :condition (encapsulated-condition condition)
+ :form exp))))
+ (typecase exp
+ (symbol
+ (ecase (info :variable :kind exp)
+ ((:special :global :constant :unknown)
+ (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
+ (sb!alien-internals:alien-value 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 (and (legal-fun-name-p name)
+ (not (consp (let ((sb!c:*lexenv* lexenv))
+ (sb!c:lexenv-find name funs)))))
+ (%coerce-name-to-fun name)
+ ;; FIXME: This is a bit wasteful: it would be nice to call
+ ;; COMPILE-IN-LEXENV with the lambda-form directly, but
+ ;; getting consistent source context and muffling compiler notes
+ ;; is easier this way.
+ (%simple-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)
+ (simple-eval-in-lexenv (second args) lexenv)))
+ (set (first args)
+ (simple-eval-in-lexenv (second args) lexenv))))
+ (let ((symbol (first name)))
+ (case (info :variable :kind symbol)
+ (:special)
+ (t (return (%simple-eval original-exp lexenv))))
+ (unless (type= (info :variable :type symbol)
+ *universal-type*)
+ ;; let the compiler deal with type checking
+ (return (%simple-eval original-exp lexenv)))))))
+ ((progn)
+ (simple-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
+ (simple-eval-progn-body body lexenv)))))
+ ((locally)
+ (simple-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))))
+ (simple-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))
+ (simple-eval-locally `(locally ,@body) lexenv :vars vars))))
+ ((if)
+ (destructuring-bind (test then &optional else) (rest exp)
+ (eval-in-lexenv (if (eval-in-lexenv test lexenv)
+ then
+ else)
+ lexenv)))
+ ((let let*)
+ (%simple-eval exp 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)))
+ (%simple-eval exp lexenv))))))
+ (t
+ exp))))))
+
+(defun eval-in-lexenv (exp lexenv)
+ #!+sb-eval
+ (if (eq *evaluator-mode* :compile)
+ (simple-eval-in-lexenv exp lexenv)
+ (sb!eval:eval-in-native-environment exp lexenv))
+ #!-sb-eval
+ (simple-eval-in-lexenv exp lexenv))
+