bug#29957: 27.0.50; xgettype (and friends) don't know about Lisp_Word

bug#29957: 27.0.50; xgettype (and friends) don't know about Lisp_Word

[Stefan Monnier]

Package: Emacs
Version: 27.0.50


    % cd .../emacs/src
    % gdb emacs
    (gdb) b main
    (gdb) r
    (gdb) xgettype Qnil

Tells me "Argument to arithmetic operation not a number or boolean."
`xbacktrace` says the same.

This seems to be due to the recent change to the representation of
List_Object.


        Stefan

bug#29957: 27.0.50; xgettype (and friends) don't know about Lisp_Word

[Paul Eggert]

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Thanks for reporting that; I installed the attached.

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From f8b4e87d5d4f57954b50677add76ce5136211dc1 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 2 Jan 2018 22:38:01 -0800
Subject: [PATCH] Fix .gdbinit to work with Lisp_Word

Problem reported by Stefan Monnier (Bug#29957).
* src/.gdbinit (xgetptr, xgetint, xgettype):
Cast Lisp_Word value to EMACS_INT, since it might be a pointer now.
---
 src/.gdbinit | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/.gdbinit b/src/.gdbinit
index de35ef1..a5411e6 100644
--- a/src/.gdbinit
+++ b/src/.gdbinit
@@ -49,7 +49,7 @@ define xgetptr
   else
     set $bugfix = $arg0
   end
-  set $ptr = $bugfix & VALMASK
+  set $ptr = (EMACS_INT) $bugfix & VALMASK
 end
 
 define xgetint
@@ -58,7 +58,7 @@ define xgetint
   else
     set $bugfix = $arg0
   end
-  set $int = $bugfix << (USE_LSB_TAG ? 0 : INTTYPEBITS) >> INTTYPEBITS
+  set $int = (EMACS_INT) $bugfix << (USE_LSB_TAG ? 0 : INTTYPEBITS) >> INTTYPEBITS
 end
 
 define xgettype
@@ -67,7 +67,7 @@ define xgettype
   else
     set $bugfix = $arg0
   end
-  set $type = (enum Lisp_Type) (USE_LSB_TAG ? $bugfix & (1 << GCTYPEBITS) - 1 : (EMACS_UINT) $bugfix >> VALBITS)
+  set $type = (enum Lisp_Type) (USE_LSB_TAG ? (EMACS_INT) $bugfix & (1 << GCTYPEBITS) - 1 : (EMACS_UINT) $bugfix >> VALBITS)
 end
 
 define xgetsym
-- 
2.7.4