Change command stats reporting to use class

This removes make_command_stats_cleanup in favor of an RAII class.
The patch is reasonably straightforward, but keeping the same
semantics without excessive reindentation required splitting
captured_main in two.

2016-10-21  Tom Tromey  <tom@tromey.com>

	* maint.h (scoped_command_stats): New class.
	(make_command_stats_cleanup): Don't declare.
	* maint.c (struct cmd_stats): Remove.
	(~scoped_command_stats): Rename from report_command_stats.  Now a
	destructor.
	(scoped_command_stats): Rename from make_command_stats_cleanup.
	Now a constructor.
	* main.c (captured_main_1): New function.  Use
	scoped_command_stats.
	(captured_main): Call captured_main_1.
	* event-top.c (command_handler): Use scoped_command_stats.

1 files changed, 35 insertions, 4 deletions

diff --git a/gdb/maint.h b/gdb/maint.h
index 841e790..8d03800 100644
--- a/gdb/maint.h
+++ b/gdb/maint.h
@@ -23,9 +23,40 @@ extern void set_per_command_time (int);
 
 extern void set_per_command_space (int);
 
-/* Note: There's no set_per_command_symtab on purpose.
-   Symtab stats aren't yet as useful for --statistics output.  */
-
-extern struct cleanup *make_command_stats_cleanup (int);
+/* Records a run time and space usage to be used as a base for
+   reporting elapsed time or change in space.  */
+
+class scoped_command_stats
+{
+ public:
+
+  explicit scoped_command_stats (bool msg_type);
+  ~scoped_command_stats ();
+
+ private:
+
+  // No need for these.  They are intentionally not defined anywhere.
+  scoped_command_stats &operator= (const scoped_command_stats &);
+  scoped_command_stats (const scoped_command_stats &);
+
+  /* Zero if the saved time is from the beginning of GDB execution.
+     One if from the beginning of an individual command execution.  */
+  bool m_msg_type;
+  /* Track whether the stat was enabled at the start of the command
+     so that we can avoid printing anything if it gets turned on by
+     the current command.  */
+  int m_time_enabled : 1;
+  int m_space_enabled : 1;
+  int m_symtab_enabled : 1;
+  long m_start_cpu_time;
+  struct timeval m_start_wall_time;
+  long m_start_space;
+  /* Total number of symtabs (over all objfiles).  */
+  int m_start_nr_symtabs;
+  /* A count of the compunits.  */
+  int m_start_nr_compunit_symtabs;
+  /* Total number of blocks.  */
+  int m_start_nr_blocks;
+};
 
 #endif /* MAINT_H */