From 4e6140b28324a9a63d54084c920206d00aed094e Mon Sep 17 00:00:00 2001
From: Vibhav Pant <vibhavp@gmail.com>
Date: Thu, 26 Jan 2017 01:02:16 +0530
Subject: [PATCH] * lisp/emacs-lisp/disass.el: Display jump tables for switch.

---
 lisp/emacs-lisp/disass.el | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/lisp/emacs-lisp/disass.el b/lisp/emacs-lisp/disass.el
index 97e45e070d0..22c1c962a39 100644
--- a/lisp/emacs-lisp/disass.el
+++ b/lisp/emacs-lisp/disass.el
@@ -221,9 +221,17 @@ OBJ should be a call to BYTE-CODE generated by the byte compiler."
 		((memq op '(byte-constant byte-constant2))
 		 ;; it's a constant
 		 (setq arg (car arg))
-		 ;; but if the value of the constant is compiled code, then
-		 ;; recursively disassemble it.
-		 (cond ((or (byte-code-function-p arg)
+                 ;; if the succeeding op is byte-switch, display the jump table
+                 ;; used
+		 (cond ((eq (car-safe (car-safe (cdr lap))) 'byte-switch)
+                         (insert (format "<jump-table-%s ( " (hash-table-test arg)))
+                         (maphash #'(lambda (value tag)
+                                      (insert (format "%s %s " value (cadr tag))))
+                                  arg)
+                         (insert ")>"))
+                  ;; if the value of the constant is compiled code, then
+                  ;; recursively disassemble it.
+                  ((or (byte-code-function-p arg)
 			    (and (consp arg) (functionp arg)
 				 (assq 'byte-code arg))
 			    (and (eq (car-safe arg) 'macro)
-- 
2.39.5