Fix gdb.base/maint.exp regressions

This commit fixes these regressions:

 FAIL: gdb.base/maint.exp: mt set per on for expand-symtabs
 FAIL: gdb.base/maint.exp: maint set per-command on

caused by commit 1e3b796d58ac ("Change command stats reporting to use
class").

gdb.log shows that the command stats are now printing garbage:

 (gdb) mt set per on
 Command execution time: -6.-419590 (cpu), 1467139648.-7706296840 (wall)
 Space used: 9809920 (-33276528 for this command)
 (gdb) FAIL: gdb.base/maint.exp: mt set per on for expand-symtabs

while there should have been no output at all.

The stats printing is done from within the scoped_command_stats's
destructor, depending on whether some flags in the object are set.
The problem is simply that scoped_command_stats's ctor misses clearing
those flags on some paths.

Since scoped_command_stats objects are allocated on the stack, whether
you'll see the regression simply depends on whatever happens to
already be on the stack space the object occupies.

gdb/ChangeLog:
2016-10-28  Pedro Alves  <palves@redhat.com>

	* maint.c (scoped_command_stats::scoped_command_stats): Clear
	m_space_enabled, m_time_enabled and m_symtab_enabled.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 7b5ff1a..c93d513 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2016-10-28  Pedro Alves  <palves@redhat.com>
+
+       * maint.c (scoped_command_stats::scoped_command_stats): Clear
+       m_space_enabled, m_time_enabled and m_symtab_enabled.
+
 2016-10-28  Markus Metzger  <markus.t.metzger@intel.com>
 
        * btrace.c (bfun_s): New typedef.

diff --git a/gdb/maint.c b/gdb/maint.c
index e0ef4fd..25a495c 100644 (file)
--- a/gdb/maint.c
+++ b/gdb/maint.c
@@ -887,6 +887,8 @@ scoped_command_stats::scoped_command_stats (bool msg_type)
       m_space_enabled = 1;
 #endif
     }
+  else
+    m_space_enabled = 0;
 
   if (msg_type == 0 || per_command_time)
     {
@@ -894,6 +896,8 @@ scoped_command_stats::scoped_command_stats (bool msg_type)
       gettimeofday (&m_start_wall_time, NULL);
       m_time_enabled = 1;
     }
+  else
+    m_time_enabled = 0;
 
   if (msg_type == 0 || per_command_symtab)
     {
@@ -905,6 +909,8 @@ scoped_command_stats::scoped_command_stats (bool msg_type)
       m_start_nr_blocks = nr_blocks;
       m_symtab_enabled = 1;
     }
+  else
+    m_symtab_enabled = 0;
 
   /* Initalize timer to keep track of how long we waited for the user.  */
   reset_prompt_for_continue_wait_time ();