(in-package "SB!IMPL")
\f
-;;;; variables related to saving core files
-;;;;
-;;;; (Most of the save-a-core functionality is defined later, in its
-;;;; own file, but we'd like to have these symbols declared special
-;;;; and initialized ASAP.)
+;;;; variables initialization and shutdown sequences
-(defvar *before-save-initializations* nil
+;; (Most of the save-a-core functionality is defined later, in its
+;; own file, but we'd like to have these symbols declared special
+;; and initialized ASAP.)
+(defvar *save-hooks* nil
#!+sb-doc
- "This is a list of functions which are called before creating a saved core
- image. These functions are executed in the child process which has no ports,
- so they cannot do anything that tries to talk to the outside world.")
+ "This is a list of functions which are called in an unspecified
+order before creating a saved core image. Unused by SBCL itself:
+reserved for user and applications.")
-(defvar *after-save-initializations* nil
+(defvar *init-hooks* nil
#!+sb-doc
- "This is a list of functions which are called when a saved core image starts
- up. The system itself should be initialized at this point, but applications
- might not be.")
-\f
-;;;; miscellaneous I/O
+ "This is a list of functions which are called in an unspecified
+order when a saved core image starts up, after the system itself has
+been initialized. Unused by SBCL itself: reserved for user and
+applications.")
+
+(defvar *exit-hooks* nil
+ #!+sb-doc
+ "This is a list of functions which are called in an unspecified
+order when SBCL process exits. Unused by SBCL itself: reserved for
+user and applications. Using (SB-EXT:EXIT :ABORT T), or calling
+exit(3) directly will circumvent these hooks.")
-(defun skip-whitespace (&optional (stream *standard-input*))
- (loop (let ((char (read-char stream)))
- (unless (sb!impl::whitespacep char)
- (return (unread-char char stream))))))
+\f
+;;; Binary search for simple vectors
+(defun binary-search (value seq &key (key #'identity))
+ (declare (simple-vector seq))
+ (labels ((recurse (start end)
+ (when (< start end)
+ (let* ((i (+ start (truncate (- end start) 2)))
+ (elt (svref seq i))
+ (key-value (funcall key elt)))
+ (cond ((< value key-value)
+ (recurse start i))
+ ((> value key-value)
+ (recurse (1+ i) end))
+ (t
+ elt))))))
+ (recurse 0 (length seq))))
+\f
;;; like LISTEN, but any whitespace in the input stream will be flushed
(defun listen-skip-whitespace (&optional (stream *standard-input*))
(do ((char (read-char-no-hang stream nil nil nil)
- (read-char-no-hang stream nil nil nil)))
+ (read-char-no-hang stream nil nil nil)))
((null char) nil)
- (cond ((not (whitespace-char-p char))
- (unread-char char stream)
- (return t)))))
+ (cond ((not (whitespace[1]p char))
+ (unread-char char stream)
+ (return t)))))
\f
;;;; helpers for C library calls
;;; errno problem, arranging for the condition's print representation
;;; to be similar to the ANSI C perror(3) style.
(defun simple-perror (prefix-string
- &key
- (errno (get-errno))
- (simple-error 'simple-error)
- other-condition-args)
+ &key
+ (errno (get-errno))
+ (simple-error 'simple-error)
+ other-condition-args)
(declare (type symbol simple-error))
(aver (subtypep simple-error 'simple-condition))
(aver (subtypep simple-error 'error))
(apply #'error
- simple-error
- :format-control "~@<~A: ~2I~_~A~:>"
- :format-arguments (list prefix-string (strerror errno))
- other-condition-args))
+ simple-error
+ :format-control "~@<~A: ~2I~_~A~:>"
+ :format-arguments (list prefix-string (strerror errno))
+ other-condition-args))
+
+;;; Constructing shortish strings one character at a time. More efficient then
+;;; a string-stream, as can directly use simple-base-strings when applicable,
+;;; and if the maximum size is know doesn't need to copy the result at all --
+;;; but if the result is going to be HUGE, string-streams will win.
+(defmacro with-push-char ((&key (element-type 'character) (initial-size 28)) &body body)
+ (with-unique-names (string size pointer)
+ `(let* ((,size ,initial-size)
+ (,string (make-array ,size :element-type ',element-type))
+ (,pointer 0))
+ (declare (type (integer 0 ,sb!xc:array-dimension-limit) ,size)
+ (type (integer 0 ,(1- sb!xc:array-dimension-limit)) ,pointer)
+ (type (simple-array ,element-type (*)) ,string))
+ (flet ((push-char (char)
+ (declare (optimize (sb!c::insert-array-bounds-checks 0)))
+ (when (= ,pointer ,size)
+ (let ((old ,string))
+ (setf ,size (* 2 (+ ,size 2))
+ ,string (make-array ,size :element-type ',element-type))
+ (replace ,string old)))
+ (setf (char ,string ,pointer) char)
+ (incf ,pointer))
+ (get-pushed-string ()
+ (let ((string ,string)
+ (size ,pointer))
+ (setf ,size 0
+ ,pointer 0
+ ,string ,(coerce "" `(simple-array ,element-type (*))))
+ ;; This is really local, so we can be destructive!
+ (%shrink-vector string size)
+ string)))
+ ,@body))))
+
+;;; The smallest power of two that is equal to or greater than X.
+(defun power-of-two-ceiling (x)
+ (declare (index x))
+ (ash 1 (integer-length (1- x))))
projects / sbcl.git / blobdiff