[PATCH] Two fixes in dwarf-mode.el

[Tom Tromey]

This fixes a couple of small problems in dwarf-mode.el.

First, I noticed that for an attribute like:

 <2><136c>: Abbrev Number: 11 (DW_TAG_member)
    <136d>   DW_AT_name        : t

... the "t" would not be font-locked using the function name face.
The problem here is that the regexp assumed the indirect string
format, like:

    <12ac>   DW_AT_name        : (indirect string, offset: 0x1b40): whatever

Here the fix is to adjust the regexp to match both formats.

Second, when following a DIE reference, point could end up on an
attribute instead.  This happens when there is a zero-length attribute
with the same "offset" as the following DIE, like:

    <12c5>   DW_AT_GNU_all_call_sites: 1
 <2><12c5>: Abbrev Number: 5 (DW_TAG_formal_parameter)

Here the fix is to search for the DIE by looking for the depth ("<2>"
in the example) as well.

I've bumped the internal version number to make it simpler to install
this using the Emacs package facility.

In https://sourceware.org/bugzilla/show_bug.cgi?id=22249#c10, Nick
offered me maintainership of this file, but I wasn't sure if that was
official or not, so I haven't pushed it.

binutils/ChangeLog
2020-08-05  Tom Tromey  <tromey@adacore.com>

	* dwarf-mode.el (Version): Now 1.6.
	(dwarf-die-button-action): Tighten DIE reference regexp.
	(dwarf-font-lock-keywords): Update name regexp.
---
 binutils/ChangeLog     |  6 ++++++
 binutils/dwarf-mode.el | 12 +++++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/binutils/dwarf-mode.el b/binutils/dwarf-mode.el
index a1b2fdb75eb..4d35c4a1fd2 100644
--- a/binutils/dwarf-mode.el
+++ b/binutils/dwarf-mode.el
@@ -1,6 +1,6 @@
 ;;; dwarf-mode.el --- Browser for DWARF information. -*-lexical-binding:t-*-
 
-;; Version: 1.5
+;; Version: 1.6
 
 ;; Copyright (C) 2012-2020 Free Software Foundation, Inc.
 
@@ -27,7 +27,7 @@
 (defconst dwarf-font-lock-keywords
   '(
     ;; Name and linkage name.
-    ("DW_AT_[a-z_]*name\\s *: .*:\\(.*\\)\\s *$"
+    ("DW_AT_[a-zA-Z_]*name\\s *:\\(?:\\s *(.*):\\)?\\s *\\(.*\\)\\s *$"
      (1 font-lock-function-name-face))
 
     ("Compilation Unit @ offset 0x[0-9a-f]+"
@@ -120,9 +120,11 @@ A prefix argument means expand all children."
 ;; Either follows a DIE reference, or expands a "...".
 (defun dwarf-die-button-action (button)
   (let* ((die (button-get button 'die))
-	 ;; Note that the first number can only be decimal.
-	 (die-rx (concat "^\\s *\\(<[0-9]+>\\)?<"
-			 die ">[^<]"))
+	 ;; Note that the first number can only be decimal.  It is
+	 ;; included in this search because otherwise following a ref
+	 ;; might lead to a zero-length boolean attribute in the
+	 ;; previous DIE.
+	 (die-rx (concat "^\\s *<[0-9]+><" die ">:"))
 	 (old (point))
 	 (is-ref (button-get button 'die-ref)))
     (if is-ref
-- 
2.26.2