X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fprimordial-extensions.lisp;h=4f259760e5190fe9a23a0e8c081e535c1038bf5e;hb=22b819c0cd0ca0ea5be52ba280b9e9e0b8e86210;hp=09ec0ca6d5cc38a7e7902ff46d72ce3a15d3203d;hpb=7c07a6f965c51828d8f452b47e0620d8e6cf2959;p=sbcl.git diff --git a/src/code/primordial-extensions.lisp b/src/code/primordial-extensions.lisp index 09ec0ca..4f25976 100644 --- a/src/code/primordial-extensions.lisp +++ b/src/code/primordial-extensions.lisp @@ -10,7 +10,7 @@ ;;;; provided with absolutely no warranty. See the COPYING and CREDITS ;;;; files for more information. -(in-package "SB!INT") +(in-package "SB!IMPL") ;;;; target constants which need to appear as early as possible @@ -35,19 +35,10 @@ ;;; gencgc.c code on this value being a symbol. (This is only one of ;;; several nasty dependencies between that code and this, alas.) ;;; -- WHN 2001-08-17 -;;; -;;; FIXME: We end up doing two DEFCONSTANT forms because (1) LispWorks -;;; needs EVAL-WHEN wrapped around DEFCONSTANT, and (2) SBCL's -;;; DEFCONSTANT expansion doesn't seem to behave properly inside -;;; EVAL-WHEN, so that without this, the +EMPTY-HT-SLOT+ references in -;;; e.g. DOHASH macroexpansions don't end up being replaced by -;;; constant values, so that the system dies at cold init because -;;; '+EMPTY-HT-SLOT+ isn't bound yet. It's hard to fix this properly -;;; until SBCL's EVAL-WHEN is fixed, which is waiting for the IR1 -;;; interpreter to go away, which is waiting for sbcl-0.7.x.. (eval-when (:compile-toplevel :load-toplevel :execute) - (defconstant +empty-ht-slot+ '%empty-ht-slot%)) -(defconstant +empty-ht-slot+ '#.+empty-ht-slot+) ; egads.. See FIXME above. + (def!constant +empty-ht-slot+ '%empty-ht-slot%)) +;;; We shouldn't need this mess now that EVAL-WHEN works. + ;;; KLUDGE: Using a private symbol still leaves us vulnerable to users ;;; getting nonconforming behavior by messing around with ;;; DO-ALL-SYMBOLS. That seems like a fairly obscure problem, so for @@ -66,8 +57,8 @@ ;;;; DO-related stuff which needs to be visible on the cross-compilation host -(eval-when (:compile-toplevel :load-toplevel :execute) - (defun do-do-body (varlist endlist decls-and-code bind step name block) +(eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute) + (defun frob-do-body (varlist endlist decls-and-code bind step name block) (let* ((r-inits nil) ; accumulator for reversed list (r-steps nil) ; accumulator for reversed list (label-1 (gensym)) @@ -128,17 +119,70 @@ ;;; EXIT-FORMS are evaluated as a PROGN, with the result being the ;;; value of the DO. (defmacro do-anonymous (varlist endlist &rest body) - (do-do-body varlist endlist body 'let 'psetq 'do-anonymous (gensym))) + (frob-do-body varlist endlist body 'let 'psetq 'do-anonymous (gensym))) + +;;;; GENSYM tricks + +;;; Automate an idiom often found in macros: +;;; (LET ((FOO (GENSYM "FOO")) +;;; (MAX-INDEX (GENSYM "MAX-INDEX-"))) +;;; ...) +;;; +;;; "Good notation eliminates thought." -- Eric Siggia +;;; +;;; Incidentally, this is essentially the same operator which +;;; _On Lisp_ calls WITH-GENSYMS. +(defmacro with-unique-names (symbols &body body) + `(let ,(mapcar (lambda (symbol) + (let* ((symbol-name (symbol-name symbol)) + (stem (if (every #'alpha-char-p symbol-name) + symbol-name + (concatenate 'string symbol-name "-")))) + `(,symbol (gensym ,stem)))) + symbols) + ,@body)) + +;;; Return a list of N gensyms. (This is a common suboperation in +;;; macros and other code-manipulating code.) +(declaim (ftype (function (index) list) make-gensym-list)) +(defun make-gensym-list (n) + (loop repeat n collect (gensym))) ;;;; miscellany +;;; Lots of code wants to get to the KEYWORD package or the +;;; COMMON-LISP package without a lot of fuss, so we cache them in +;;; variables. TO DO: How much does this actually buy us? It sounds +;;; sensible, but I don't know for sure that it saves space or time.. +;;; -- WHN 19990521 +;;; +;;; (The initialization forms here only matter on the cross-compilation +;;; host; In the target SBCL, these variables are set in cold init.) +(declaim (type package *cl-package* *keyword-package*)) +(defvar *cl-package* (find-package "COMMON-LISP")) +(defvar *keyword-package* (find-package "KEYWORD")) + ;;; Concatenate together the names of some strings and symbols, ;;; producing a symbol in the current package. -(eval-when (:compile-toplevel :load-toplevel :execute) +(eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute) (defun symbolicate (&rest things) - (values (intern (apply #'concatenate - 'string - (mapcar #'string things)))))) + (let ((name (case (length things) + ;; why isn't this just the value in the T branch? + ;; Well, this is called early in cold-init, before + ;; the type system is set up; however, now that we + ;; check for bad lengths, the type system is needed + ;; for calls to CONCATENATE. So we need to make sure + ;; that the calls are transformed away: + (1 (concatenate 'string (the simple-string (string (car things))))) + (2 (concatenate 'string + (the simple-string (string (car things))) + (the simple-string (string (cadr things))))) + (3 (concatenate 'string + (the simple-string (string (car things))) + (the simple-string (string (cadr things))) + (the simple-string (string (caddr things))))) + (t (apply #'concatenate 'string (mapcar #'string things)))))) + (values (intern name))))) ;;; like SYMBOLICATE, but producing keywords (defun keywordicate (&rest things) @@ -211,7 +255,7 @@ (if (consp id) (values (car id) (cdr id)) (values id nil)) - (push `(defconstant ,(symbolicate prefix root suffix) + (push `(def!constant ,(symbolicate prefix root suffix) ,(+ start (* step index)) ,@docs) results))) @@ -241,12 +285,17 @@ ;;; need to avoid runtime indirection through a symbol, you might be ;;; able to do something with LOAD-TIME-VALUE or MAKE-LOAD-FORM. (defmacro defconstant-eqx (symbol expr eqx &optional doc) - `(defconstant ,symbol + `(def!constant ,symbol (%defconstant-eqx-value ',symbol ,expr ,eqx) ,@(when doc (list doc)))) (defun %defconstant-eqx-value (symbol expr eqx) + (declare (type function eqx)) (flet ((bummer (explanation) - (error "~@" symbol explanation))) + (error "~@" + symbol + expr + explanation + (symbol-value symbol)))) (cond ((not (boundp symbol)) expr) ((not (constantp symbol)) @@ -255,3 +304,24 @@ (bummer "already bound as a different constant value")) (t (symbol-value symbol))))) + +;;; a helper function for various macros which expect clauses of a +;;; given length, etc. +;;; +;;; Return true if X is a proper list whose length is between MIN and +;;; MAX (inclusive). +(defun proper-list-of-length-p (x min &optional (max min)) + ;; FIXME: This implementation will hang on circular list + ;; structure. Since this is an error-checking utility, i.e. its + ;; job is to deal with screwed-up input, it'd be good style to fix + ;; it so that it can deal with circular list structure. + (cond ((minusp max) nil) + ((null x) (zerop min)) + ((consp x) + (and (plusp max) + (proper-list-of-length-p (cdr x) + (if (plusp (1- min)) + (1- min) + 0) + (1- max)))) + (t nil)))