2010-03-18 Stan Shebs <stan@codesourcery.com>

2010-03-18  Stan Shebs  <stan@codesourcery.com>
	    Pedro Alves  <pedro@codesourcery.com>

	* target.h (struct target_ops): New method
	to_set_circular_trace_buffer.
	(target_set_circular_trace_buffer): New macro.
	* target.c (update_current_target): Add
	to_set_circular_trace_buffer, fix to_set_disconnected_tracing
	default behavior.
	* remote.c (remote_set_circular_trace_buffer): New function.
	(init_remote_ops): Add it to vector.
	* tracepoint.h (struct trace_status): New field traceframes_created,
	change buffer_size and buffer_free to int.
	* tracepoint.c (circular_trace_buffer): New global.
	(start_tracing): Send values of disconnected tracing and circular
	trace buffer settings.
	(set_circular_trace_buffer): New function.
	(parse_trace_state): Handle total space and frames created.
	(trace_status_command): Display total space and total frames
	created.
	(trace_save): Write out new status values.
	(parse_trace_status): Set traceframe_count, traceframes_created,
	buffer_free and buffer_size to -1 by default.
	(_initialize_tracepoint): New setshow for circular-trace-buffer.
	* NEWS: Mention the circular trace buffer option.

	* gdb.texinfo (Starting and Stopping Trace Experiments): Describe
	circular-trace-buffer.
	(Tracepoint Packets): Describe QTBuffer, and details of the
	qTStatus reply.

	* gdb.trace/circ.exp: Test circular-trace-buffer.
	* gdb.trace/tfile.exp: Update tstatus test.