;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Apr 2000
;;;;
-;;;; $Id: macros.lisp,v 1.1 2003/04/28 23:51:59 kevin Exp $
+;;;; $Id$
;;;;
;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
;;;;
;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
;;;; *************************************************************************
-(in-package :kmrcl)
+(in-package #:kmrcl)
(defmacro let-when ((var test-form) &body body)
`(let ((,var ,test-form))
(when ,var ,@body)))
-
+
(defmacro let-if ((var test-form) if-true &optional if-false)
`(let ((,var ,test-form))
(if ,var ,if-true ,if-false)))
`(labels ((self ,parms ,@body))
#'self))
-
(defmacro aif2 (test &optional then else)
(let ((win (gensym)))
`(multiple-value-bind (it ,win) ,test
(defmacro with-each-stream-line ((var stream) &body body)
(let ((eof (gensym))
- (eof-value (gensym))
- (strm (gensym)))
+ (eof-value (gensym))
+ (strm (gensym)))
`(let ((,strm ,stream)
- (,eof ',eof-value))
+ (,eof ',eof-value))
(do ((,var (read-line ,strm nil ,eof) (read-line ,strm nil ,eof)))
- ((eql ,var ,eof))
- ,@body))))
+ ((eql ,var ,eof))
+ ,@body))))
(defmacro with-each-file-line ((var file) &body body)
(let ((stream (gensym)))
`(with-open-file (,stream ,file :direction :input)
(with-each-stream-line (,var ,stream)
- ,@body))))
+ ,@body))))
(defmacro in (obj &rest choices)
(defmacro with-gensyms (syms &body body)
`(let ,(mapcar #'(lambda (s) `(,s (gensym)))
- syms)
+ syms)
,@body))
+(defmacro time-seconds (&body body)
+ (let ((t1 (gensym)))
+ `(let ((,t1 (get-internal-real-time)))
+ (values
+ (progn ,@body)
+ (coerce (/ (- (get-internal-real-time) ,t1)
+ internal-time-units-per-second)
+ 'double-float)))))
+
(defmacro time-iterations (n &body body)
(let ((i (gensym))
- (count (gensym)))
+ (count (gensym)))
`(progn
(let ((,count ,n))
- (format t "~&Test with ~d iterations: ~W" ,count (quote ,body))
- (let ((t1 (get-internal-real-time)))
- (dotimes (,i ,count)
- ,@body)
- (let* ((t2 (get-internal-real-time))
- (secs (coerce (/ (- t2 t1)
- internal-time-units-per-second)
- 'double-float)))
- (format t "~&Total time: ")
- (print-seconds secs)
- (format t ", time per iteration: ")
- (print-seconds (coerce (/ secs ,n) 'double-float))))))))
+ (format t "~&Test with ~d iterations: ~W" ,count (quote ,body))
+ (let ((t1 (get-internal-real-time)))
+ (dotimes (,i ,count)
+ ,@body)
+ (let* ((t2 (get-internal-real-time))
+ (secs (coerce (/ (- t2 t1)
+ internal-time-units-per-second)
+ 'double-float)))
+ (format t "~&Total time: ")
+ (print-seconds secs)
+ (format t ", time per iteration: ")
+ (print-seconds (coerce (/ secs ,n) 'double-float))))))))
+
+(defmacro mv-bind (vars form &body body)
+ `(multiple-value-bind ,vars ,form
+ ,@body))
+
+;; From USENET
+(defmacro deflex (var val &optional (doc nil docp))
+ "Defines a top level (global) lexical VAR with initial value VAL,
+ which is assigned unconditionally as with DEFPARAMETER. If a DOC
+ string is provided, it is attached to both the name |VAR| and the
+ name *STORAGE-FOR-DEFLEX-VAR-|VAR|* as a documentation string of
+ kind 'VARIABLE. The new VAR will have lexical scope and thus may
+ be shadowed by LET bindings without affecting its global value."
+ (let* ((s0 (load-time-value (symbol-name '#:*storage-for-deflex-var-)))
+ (s1 (symbol-name var))
+ (p1 (symbol-package var))
+ (s2 (load-time-value (symbol-name '#:*)))
+ (backing-var (intern (concatenate 'string s0 s1 s2) p1)))
+ `(progn
+ (defparameter ,backing-var ,val ,@(when docp `(,doc)))
+ ,@(when docp
+ `((setf (documentation ',var 'variable) ,doc)))
+ (define-symbol-macro ,var ,backing-var))))
+
+(defmacro def-cached-vector (name element-type)
+ (let ((get-name (concat-symbol "get-" name "-vector"))
+ (release-name (concat-symbol "release-" name "-vector"))
+ (table-name (concat-symbol "*cached-" name "-table*"))
+ (lock-name (concat-symbol "*cached-" name "-lock*")))
+ `(eval-when (:compile-toplevel :load-toplevel :execute)
+ (defvar ,table-name (make-hash-table :test 'equal))
+ (defvar ,lock-name (kmrcl::make-lock ,name))
+
+ (defun ,get-name (size)
+ (kmrcl::with-lock-held (,lock-name)
+ (let ((buffers (gethash (cons size ,element-type) ,table-name)))
+ (if buffers
+ (let ((buffer (pop buffers)))
+ (setf (gethash (cons size ,element-type) ,table-name) buffers)
+ buffer)
+ (make-array size :element-type ,element-type)))))
+
+ (defun ,release-name (buffer)
+ (kmrcl::with-lock-held (,lock-name)
+ (let ((buffers (gethash (cons (array-total-size buffer)
+ ,element-type)
+ ,table-name)))
+ (setf (gethash (cons (array-total-size buffer)
+ ,element-type) ,table-name)
+ (cons buffer buffers))))))))
+
+(defmacro def-cached-instance (name)
+ (let* ((new-name (concat-symbol "new-" name "-instance"))
+ (release-name (concat-symbol "release-" name "-instance"))
+ (cache-name (concat-symbol "*cached-" name "-instance-table*"))
+ (lock-name (concat-symbol "*cached-" name "-instance-lock*")))
+ `(eval-when (:compile-toplevel :load-toplevel :execute)
+ (defvar ,cache-name nil)
+ (defvar ,lock-name (kmrcl::make-lock ',name))
+
+ (defun ,new-name ()
+ (kmrcl::with-lock-held (,lock-name)
+ (if ,cache-name
+ (pop ,cache-name)
+ (make-instance ',name))))
+
+ (defun ,release-name (instance)
+ (kmrcl::with-lock-held (,lock-name)
+ (push instance ,cache-name))))))
+
+(defmacro with-ignore-errors (&rest forms)
+ `(progn
+ ,@(mapcar
+ (lambda (x) (list 'ignore-errors x))
+ forms)))
+
+(defmacro ppmx (form)
+ "Pretty prints the macro expansion of FORM."
+ `(let* ((exp1 (macroexpand-1 ',form))
+ (exp (macroexpand exp1))
+ (*print-circle* nil))
+ (cond ((equal exp exp1)
+ (format t "~&Macro expansion:")
+ (pprint exp))
+ (t (format t "~&First step of expansion:")
+ (pprint exp1)
+ (format t "~%~%Final expansion:")
+ (pprint exp)))
+ (format t "~%~%")
+ (values)))
+
+(defmacro defconstant* (sym value &optional doc)
+ "Ensure VALUE is evaluated only once."
+ `(defconstant ,sym (if (boundp ',sym)
+ (symbol-value ',sym)
+ ,value)
+ ,@(when doc (list doc))))
+
+(defmacro defvar-unbound (sym &optional (doc ""))
+ "defvar with a documentation string."
+ `(progn
+ (defvar ,sym)
+ (setf (documentation ',sym 'variable) ,doc)))
+
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