0.pre7.50:

[sbcl.git] / src / code / backq.lisp

diff --git a/src/code/backq.lisp b/src/code/backq.lisp
index c601ee4..acc7839 100644 (file)
--- a/src/code/backq.lisp
+++ b/src/code/backq.lisp
@@ -11,6 +11,8 @@
 
 (in-package "SB!IMPL")
 
+(/show0 "entering backq.lisp")
+
 ;;; The flags passed back by BACKQUOTIFY can be interpreted as follows:
 ;;;
 ;;;   |`,|: [a] => a
@@ -45,6 +47,8 @@
 (defvar *bq-dot-flag* '(|,.|))
 (defvar *bq-vector-flag* '(|bqv|))
 
+(/show0 "backq.lisp 50")
+
 ;;; the actual character macro
 (defun backquote-macro (stream ignore)
   (declare (ignore ignore))
@@ -57,6 +61,8 @@
          (%reader-error stream ",. after backquote in ~S" thing))
       (values (backquotify-1 flag thing) 'list))))
 
+(/show0 "backq.lisp 64")
+
 (defun comma-macro (stream ignore)
   (declare (ignore ignore))
   (unless (> *backquote-count* 0)
@@ -74,6 +80,8 @@
              (cons *bq-comma-flag* (read stream t nil t))))
      'list)))
 
+(/show0 "backq.lisp 83")
+
 ;;; This does the expansion from table 2.
 (defun backquotify (stream code)
   (cond ((atom code)
@@ -128,12 +136,14 @@
                       (values 'list*
                               (list a (backquotify-1 dflag d)))))))))))
 
+(/show0 "backq.lisp 139")
+
 ;;; This handles the <hair> cases.
 (defun comma (code)
   (cond ((atom code)
         (cond ((null code)
                (values nil nil))
-              ((or (numberp code) (eq code 't))
+              ((or (numberp code) (eq code t))
                (values t code))
               (t (values *bq-comma-flag* code))))
        ((eq (car code) 'quote)
@@ -144,6 +154,8 @@
         (values 'list* (cdr code)))
        (t (values *bq-comma-flag* code))))
 
+(/show0 "backq.lisp 157")
+
 ;;; This handles table 1.
 (defun backquotify-1 (flag thing)
   (cond ((or (eq flag *bq-comma-flag*)
@@ -169,8 +181,11 @@
 \f
 ;;;; magic BACKQ- versions of builtin functions
 
-;;; Define synonyms for the lisp functions we use, so that by using them, we
-;;; backquoted material will be recognizable to the pretty-printer.
+(/show0 "backq.lisp 184")
+
+;;; Define synonyms for the lisp functions we use, so that by using
+;;; them, the backquoted material will be recognizable to the
+;;; pretty-printer.
 (macrolet ((def-frob (b-name name)
             (let ((args (gensym "ARGS")))
               ;; FIXME: This function should be INLINE so that the lists
@@ -186,24 +201,31 @@
   (def-frob backq-nconc nconc)
   (def-frob backq-cons cons))
 
+(/show0 "backq.lisp 204")
+
 (defun backq-vector (list)
   (declare (list list))
   (coerce list 'simple-vector))
 \f
 ;;;; initialization
 
+(/show0 "backq.lisp 212")
+
 ;;; Install BACKQ stuff in the current *READTABLE*.
 ;;;
-;;; In the target Lisp, we have to wait to do this until the readtable has been
-;;; created. In the cross-compilation host Lisp, we can do this right away.
-;;; (You may ask: In the cross-compilation host, which already has its own
-;;; implementation of the backquote readmacro, why do we do this at all?
-;;; Because the cross-compilation host might -- as SBCL itself does -- express
-;;; the backquote expansion in terms of internal, nonportable functions. By
-;;; redefining backquote in terms of functions which are guaranteed to exist on
-;;; the target Lisp, we ensure that backquote expansions in code-generating
-;;; code work properly.)
+;;; In the target Lisp, we have to wait to do this until the readtable
+;;; has been created. In the cross-compilation host Lisp, we can do
+;;; this right away. (You may ask: In the cross-compilation host,
+;;; which already has its own implementation of the backquote
+;;; readmacro, why do we do this at all? Because the cross-compilation
+;;; host might -- as SBCL itself does -- express the backquote
+;;; expansion in terms of internal, nonportable functions. By
+;;; redefining backquote in terms of functions which are guaranteed to
+;;; exist on the target Lisp, we ensure that backquote expansions in
+;;; code-generating code work properly.)
 (defun !backq-cold-init ()
   (set-macro-character #\` #'backquote-macro)
   (set-macro-character #\, #'comma-macro))
 #+sb-xc-host (!backq-cold-init)
+
+(/show0 "done with backq.lisp")