Re: [PATCH] Fix PR gdb/17035: "show user" doesn't list user-defined commands that have empty bodies.

[Gabriel Krisman Bertazi <gabriel@krisman.be>]

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Hello Pedro,

I appreciate your comments,

>> I don't see that as a problem, because python/scheme are also user
>> commands (or, at least, are part of class_user class).  Considering that
>> "help user-defined" also shows python/scheme commands, I believe it
>> would be more practical to just list them on "show user" (should we
>> update the doc string, as well).
>
> I think we'll need to track down the original discussion, and
> ask whoever was involved.  Otherwise, we'd just be going in
> circles.  :-)
>
> E.g., that commit changed the online help and the manual to
> try to make that clear.
>
> (gdb) help show user
> Show definitions of non-python/scheme user defined commands.
> Argument is the name of the user defined command.
> With no argument, show definitions of all user defined commands.
>

Reviewing the original discussion, (for the record,
<https://sourceware.org/ml/gdb-patches/2012-02/msg00246.html>), Doug has
made a pretty good point on not showing python/scheme commands here.

Since this is a simple bug fix, I'd rather not modify the behavior
here, so I rewrote the patch to not show python/scheme commands.  It got
a little simpler, since I don't have to touch a lot of testcases
anymore.

Now we use the fact that the c->function union is NULL when we have a
python/scheme command (they both use c->func directly).

I also added two testcases to make sure we are not printing scheme or
python commands, as you suggested.

>> Using the verification for cfunc/sfunc above, also avoids
>> printing the "user-defined" line.
>
> Hmm, but what is that "user-defined" command ?

user-defined is a null command.  It does nothing.  It is defined as
follows:

  add_cmd ("user-defined", class_user, NULL, _("\
User-defined commands.\n\
The commands in this class are those defined by the user.\n\
Use the \"define\" command to define a command."), &cmdlist);

I guess it's only purpose is at help user-defined.

Do you think it is acceptable now?

gdb/
2014-08-20  Gabriel Krisman Bertazi  <gabriel@krisman.be>

	* cli/cli-cmds.c (show_user): Verify if c->function is NULL to
	  decide whether c is a python/scheme command.
	* cli/cli-script.c (show_user_1): Only verify cmdlines after
	  printing command name.

gdb/testsuite/
2014-08-20  Gabriel Krisman Bertazi  <gabriel@krisman.be>

	* gdb.base/commands.exp: Include tests to verify user-defined
	  commands with empty bodies.
	* gdb.python/py-cmd.exp: Don't show user-defined python commands
	  in `show user command`
	* gdb.python/scm-cmd.exp: Don't show user-defined scheme commands
	  in `show user command`


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diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index b415267..4f624f2 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -1245,8 +1245,9 @@ show_user (char *args, int from_tty)
       const char *comname = args;
 
       c = lookup_cmd (&comname, cmdlist, "", 0, 1);
-      /* c->user_commands would be NULL if it's a python/scheme command.  */
-      if (c->class != class_user || !c->user_commands)
+      /* c->function.cfunc would be NULL if it's a python/scheme
+	 command.  */
+      if (c->class != class_user || c->function.cfunc == NULL)
 	error (_("Not a user command."));
       show_user_1 (c, "", args, gdb_stdout);
     }
@@ -1254,7 +1255,8 @@ show_user (char *args, int from_tty)
     {
       for (c = cmdlist; c; c = c->next)
 	{
-	  if (c->class == class_user || c->prefixlist != NULL)
+	  if ((c->class == class_user && c->function.cfunc != NULL)
+	      || c->prefixlist != NULL)
 	    show_user_1 (c, "", c->name, gdb_stdout);
 	}
     }
diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index 0f0a97e..37cb82a 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -1717,10 +1717,10 @@ show_user_1 (struct cmd_list_element *c, const char *prefix, const char *name,
     }
 
   cmdlines = c->user_commands;
-  if (!cmdlines)
-    return;
   fprintf_filtered (stream, "User command \"%s%s\":\n", prefix, name);
 
+  if (!cmdlines)
+    return;
   print_command_lines (current_uiout, cmdlines, 1);
   fputs_filtered ("\n", stream);
 }
diff --git a/gdb/testsuite/gdb.base/commands.exp b/gdb/testsuite/gdb.base/commands.exp
index 7363420..b2d1c76 100644
--- a/gdb/testsuite/gdb.base/commands.exp
+++ b/gdb/testsuite/gdb.base/commands.exp
@@ -243,6 +243,28 @@ proc user_defined_command_test {} {
    gdb_test "show user mycommand" \
 	"  while \\\$arg0.*set.*    if \\\(\\\$arg0.*p/x.*    else\[^\n\].*p/x.*    end\[^\n\].*  end\[^\n\].*" \
 	   "display user command in user_defined_command_test"
+
+    #  Create and test an user-defined command with an empty body.
+    gdb_test_multiple "define myemptycommand" \
+	"define myemptycommand in user_defined_command_test" {
+	    -re "End with"  {
+		pass "define myemptycommand in user_defined_command_test"
+	    }
+	}
+    gdb_test "end" \
+	"" \
+	"End definition of user-defined command with empty body."
+
+    gdb_test_no_output "myemptycommand" \
+	"execute user-defined empty command in user_defined_command_test"
+
+    gdb_test "show user" \
+	"User command \"myemptycommand.*" \
+	"display empty command in command list in user_defined_command_test"
+
+    gdb_test "show user myemptycommand" \
+	"User command \"myemptycommand.*" \
+	"display user-defined emtpy command in user_defined_command_test"
 }
 
 proc watchpoint_command_test {} {
diff --git a/gdb/testsuite/gdb.guile/scm-cmd.exp b/gdb/testsuite/gdb.guile/scm-cmd.exp
index a407f63..36ef03d 100644
--- a/gdb/testsuite/gdb.guile/scm-cmd.exp
+++ b/gdb/testsuite/gdb.guile/scm-cmd.exp
@@ -134,6 +134,10 @@ gdb_test "help user-defined" \
     "User-defined commands.\[\r\n\]+The commands in this class are those defined by the user.\[\r\n\]+Use the \"define\" command to define a command.\[\r\n\]+List of commands:\[\r\n\]+test-help -- Docstring\[\r\n\]+Type \"help\" followed by command name for full documentation.\[\r\n\]+Type \"apropos word\" to search for commands related to \"word\".\[\r\n\]+Command name abbreviations are allowed if unambiguous.\[\r\n\]+" \
     "see user-defined command in `help user-defined`"
 
+# Make sure the command does not show up in `show user`.
+gdb_test "show user test-help" "Not a user command\." \
+    "Don't show user-defined scheme command in `show user command`"
+
 # Test expression completion on fields.
 
 gdb_test_multiline "expression completion command" \
diff --git a/gdb/testsuite/gdb.python/py-cmd.exp b/gdb/testsuite/gdb.python/py-cmd.exp
index a87aecb..3ae4053 100644
--- a/gdb/testsuite/gdb.python/py-cmd.exp
+++ b/gdb/testsuite/gdb.python/py-cmd.exp
@@ -161,6 +161,10 @@ gdb_test "test_help ugh" "test_cmd output, arg = ugh" "call simple user-defined
 # Make sure the command shows up in `help user-defined`.
 gdb_test "help user-defined" "User-defined commands.\[\r\n\]+The commands in this class are those defined by the user.\[\r\n\]+Use the \"define\" command to define a command.\[\r\n\]+\[\r\n\]+List of commands:\[\r\n\]+\[\r\n\]+test_help -- Docstring\[\r\n\]+\[\r\n\]+Type \"help\" followed by command name for full documentation.\[\r\n\]+Type \"apropos word\" to search for commands related to \"word\".\[\r\n\]+Command name abbreviations are allowed if unambiguous.\[\r\n\]+" "see user-defined command in `help user-defined`"
 
+# Make sure the command does not show up in `show user`.
+gdb_test "show user test_help" "Not a user command\." \
+    "Don't show user-defined python command in `show user command`"
+
 # Test expression completion on fields
 gdb_py_test_multiple "expression completion command" \
   "python" "" \

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-- 
Gabriel Krisman Bertazi