fix "unable to read" compiler-error reporting during SBCL build

[sbcl.git] / src / code / early-extensions.lisp

diff --git a/src/code/early-extensions.lisp b/src/code/early-extensions.lisp
index bde43c1..74f0b8f 100644 (file)
--- a/src/code/early-extensions.lisp
+++ b/src/code/early-extensions.lisp
@@ -1140,6 +1140,8 @@
 ;;; deprecated.texinfo.
 ;;;
 ;;; EARLY:
+;;; - SB-THREAD::GET-MUTEX, since 1.0.37.33 (04/2010)               -> Late: 01/2013
+;;;   ^- initially deprecated without compile-time warning, hence the schedule
 ;;; - SB-THREAD::SPINLOCK (type), since 1.0.53.11 (08/2011)         -> Late: 08/2012
 ;;; - SB-THREAD::MAKE-SPINLOCK, since 1.0.53.11 (08/2011)           -> Late: 08/2012
 ;;; - SB-THREAD::WITH-SPINLOCK, since 1.0.53.11 (08/2011)           -> Late: 08/2012
@@ -1352,3 +1354,71 @@ to :INTERPRET, an interpreter will be used.")
      (if (eql x 0.0l0)
          (make-unportable-float :long-float-negative-zero)
          0.0l0))))
+
+;;; Like DEFUN, but replaces &REST with &MORE while hiding that from the
+;;; lambda-list.
+(defmacro define-more-fun (name lambda-list &body body)
+  (let* ((p (position '&rest lambda-list))
+         (head (subseq lambda-list 0 p))
+         (tail (subseq lambda-list p))
+         (more-context (gensym "MORE-CONTEXT"))
+         (more-count (gensym "MORE-COUNT")))
+    (aver (= 2 (length tail)))
+    `(progn
+       (macrolet ((more-count ()
+                    `(truly-the index ,',more-count))
+                  (more-p ()
+                    `(not (eql 0 ,',more-count)))
+                  (more-arg (n)
+                    `(sb!c:%more-arg ,',more-context ,n))
+                  (do-more ((arg &optional (start 0)) &body body)
+                    (let ((i (gensym "I")))
+                      `(do ((,i (the index ,start) (truly-the index (1+ ,i))))
+                           ((>= ,i (more-count)))
+                         (declare (index ,i))
+                         (let ((,arg (sb!c:%more-arg ,',more-context ,i)))
+                           ,@body)))))
+         (defun ,name (,@head &more ,more-context ,more-count)
+           ,@body))
+       (setf (%simple-fun-arglist #',name) ',lambda-list))))
+
+;;; Signalling an error when trying to print an error condition is
+;;; generally a PITA, so whatever the failure encountered when
+;;; wondering about FILE-POSITION within a condition printer, 'tis
+;;; better silently to give up than to try to complain.
+(defun file-position-or-nil-for-error (stream &optional (pos nil posp))
+  ;; Arguably FILE-POSITION shouldn't be signalling errors at all; but
+  ;; "NIL if this cannot be determined" in the ANSI spec doesn't seem
+  ;; absolutely unambiguously to prohibit errors when, e.g., STREAM
+  ;; has been closed so that FILE-POSITION is a nonsense question. So
+  ;; my (WHN) impression is that the conservative approach is to
+  ;; IGNORE-ERRORS. (I encountered this failure from within a homebrew
+  ;; defsystemish operation where the ERROR-STREAM had been CL:CLOSEd,
+  ;; I think by nonlocally exiting through a WITH-OPEN-FILE, by the
+  ;; time an error was reported.)
+  (if posp
+      (ignore-errors (file-position stream pos))
+      (ignore-errors (file-position stream))))
+
+(defun stream-error-position-info (stream &optional position)
+  (unless (interactive-stream-p stream)
+    (let ((now (file-position-or-nil-for-error stream))
+          (pos position))
+      (when (and (not pos) now (plusp now))
+        ;; FILE-POSITION is the next character -- error is at the previous one.
+        (setf pos (1- now)))
+      (let (lineno colno)
+        (when (and pos
+                   (< pos sb!xc:array-dimension-limit)
+                   (file-position stream :start))
+          (let ((string
+                  (make-string pos :element-type (stream-element-type stream))))
+            (when (= pos (read-sequence string stream))
+              ;; Lines count from 1, columns from 0. It's stupid and traditional.
+              (setq lineno (1+ (count #\Newline string))
+                    colno (- pos (or (position #\Newline string :from-end t) 0)))))
+          (file-position-or-nil-for-error stream now))
+        (remove-if-not #'second
+                       (list (list :line lineno)
+                             (list :column colno)
+                             (list :file-position pos)))))))