PR c++/16597

[forgot to commit/push these with previous push]

If lookup_symbol_file tries to locate a member variable with NULL name:

      /* A simple lookup failed.  Check if the symbol was defined in
         a base class.  */

      cleanup = make_cleanup (null_cleanup, NULL);

      /* Find the name of the class and the name of the method,
         variable, etc.  */
      prefix_len = cp_entire_prefix_len (name);

      /* If no prefix was found, search "this".  */
      if (prefix_len == 0)
        {
          struct type *type;
          struct symbol *this;

         this = lookup_language_this (language_def (language_cplus), block);
          if (this == NULL)
            {
              do_cleanups (cleanup);
              return NULL;
            }

          type = check_typedef (TYPE_TARGET_TYPE (SYMBOL_TYPE (this)));
          klass = xstrdup (TYPE_NAME (type));
          nested = xstrdup (name);
        }

TYPE_NAME (type) is NULL, so xstrdup (NULL) and boom!

This can happen, e.g., with clang++.  See testsuite/gdb.cp/namelessclass.exp
or the bugzilla report.

This patch simply adds a fencepost against this case, allowing the caller
of lookup_symbol_file to search other blocks for the right symbol.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index cbd3a77..cd35011 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2014-04-16  Keith Seitz  <keiths@redhat.com>
+
+       PR c++/16597
+       * cp-namespace.c (lookup_symbol_file): If the type name of
+       `this' is NULL, return immediately.
+
 2014-04-14  Keith Seitz  <keiths@redhat.com>
 
        PR c++/16253

diff --git a/gdb/cp-namespace.c b/gdb/cp-namespace.c
index 1085556..ae7c852 100644 (file)
--- a/gdb/cp-namespace.c
+++ b/gdb/cp-namespace.c
@@ -694,6 +694,11 @@ lookup_symbol_file (const char *name,
            }
 
          type = check_typedef (TYPE_TARGET_TYPE (SYMBOL_TYPE (this)));
+         /* If TYPE_NAME is NULL, abandon trying to find this symbol.
+            This can happen for lambda functions compiled with clang++,
+            which outputs no name for the container class.  */
+         if (TYPE_NAME (type) == NULL)
+           return NULL;
          klass = xstrdup (TYPE_NAME (type));
          nested = xstrdup (name);
        }

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 7c7bd34..a7e7dcb 100644 (file)
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2014-04-16  Keith Seitz  <keiths@redhat.com>
+
+       PR c++/16597
+       * gdb.cp/namelessclass.cc: New file.
+       * gdb.cp/namelessclass.exp: New file.
+       * gdb.cp/namelessclass.S: New file.
+
 2014-04-16  Doug Evans  <dje@google.com>
 
        * lib/gdbserver-support.exp (gdbserver_default_get_remote_address):