Add method to query current recording method to target_ops.

Signed-off-by: Tim Wiederhake <tim.wiederhake@intel.com>

gdb/ChangeLog

	* record-btrace.c (record_btrace_record_method): New function.
	(init_record_btrace_ops): Initialize to_record_method.
	* record-full.c (record_full_record_method): New function.
	(init_record_full_ops, init_record_full_core_ops): Add
	record_full_record_method.
	* record.h (enum record_method): New enum.
	* target-debug.h (target_debug_print_enum_record_method: New define.
	* target-delegates.c: Regenerate.
	* target.c (target_record_method): New function.
	* target.h: Include record.h.
	(struct target_ops) <to_record_method>: New field.
	(target_record_method): New export.

Change-Id: I05daa70e4e08a19901e848c731bb7d60cd87cc5a

gdb/record-btrace.c

@@ -1258,6 +1258,23 @@ record_btrace_call_history_from (struct target_ops *self,
   record_btrace_call_history_range (self, begin, end, flags);
 }
 
+/* The to_record_method method of target record-btrace.  */
+
+static enum record_method
+record_btrace_record_method (struct target_ops *self, ptid_t ptid)
+{
+  const struct btrace_config *config;
+  struct thread_info * const tp = find_thread_ptid (ptid);
+
+  if (tp == NULL)
+    error (_("No thread."));
+
+  if (tp->btrace.target == NULL)
+    return RECORD_METHOD_NONE;
+
+  return RECORD_METHOD_BTRACE;
+}
+
 /* The to_record_is_replaying method of target record-btrace.  */
 
 static int
@@ -2833,6 +2850,7 @@ init_record_btrace_ops (void)
   ops->to_call_history = record_btrace_call_history;
   ops->to_call_history_from = record_btrace_call_history_from;
   ops->to_call_history_range = record_btrace_call_history_range;
+  ops->to_record_method = record_btrace_record_method;
   ops->to_record_is_replaying = record_btrace_is_replaying;
   ops->to_record_will_replay = record_btrace_will_replay;
   ops->to_record_stop_replaying = record_btrace_stop_replaying_all;

gdb/record-full.c

@@ -1803,6 +1803,14 @@ record_full_execution_direction (struct target_ops *self)
   return record_full_execution_dir;
 }
 
+/* The to_record_method method of target record-full.  */
+
+enum record_method
+record_full_record_method (struct target_ops *self, ptid_t ptid)
+{
+  return RECORD_METHOD_FULL;
+}
+
 static void
 record_full_info (struct target_ops *self)
 {
@@ -1992,6 +2000,7 @@ init_record_full_ops (void)
   record_full_ops.to_get_bookmark = record_full_get_bookmark;
   record_full_ops.to_goto_bookmark = record_full_goto_bookmark;
   record_full_ops.to_execution_direction = record_full_execution_direction;
+  record_full_ops.to_record_method = record_full_record_method;
   record_full_ops.to_info_record = record_full_info;
   record_full_ops.to_save_record = record_full_save;
   record_full_ops.to_delete_record = record_full_delete;
@@ -2242,6 +2251,7 @@ init_record_full_core_ops (void)
   record_full_core_ops.to_goto_bookmark = record_full_goto_bookmark;
   record_full_core_ops.to_execution_direction
     = record_full_execution_direction;
+  record_full_core_ops.to_record_method = record_full_record_method;
   record_full_core_ops.to_info_record = record_full_info;
   record_full_core_ops.to_delete_record = record_full_delete;
   record_full_core_ops.to_record_is_replaying = record_full_is_replaying;

gdb/record.h

@@ -37,6 +37,19 @@ extern struct cmd_list_element *info_record_cmdlist;
 extern const struct frame_unwind record_btrace_frame_unwind;
 extern const struct frame_unwind record_btrace_tailcall_frame_unwind;
 
+/* A list of different recording methods.  */
+enum record_method
+{
+  /* No or unknown record method.  */
+  RECORD_METHOD_NONE,
+
+  /* Record method "full".  */
+  RECORD_METHOD_FULL,
+
+  /* Record method "btrace".  */
+  RECORD_METHOD_BTRACE
+};
+
 /* A list of flags specifying what record target methods should print.  */
 enum record_print_flag
 {

gdb/target-debug.h

@@ -148,6 +148,8 @@
   target_debug_do_print (host_address_to_string (X))
 #define target_debug_print_enum_btrace_format(X)	\
   target_debug_do_print (plongest (X))
+#define target_debug_print_enum_record_method(X)	\
+  target_debug_do_print (plongest (X))
 #define target_debug_print_const_struct_btrace_config_p(X)	\
   target_debug_do_print (host_address_to_string (X))
 #define target_debug_print_const_struct_btrace_target_info_p(X)	\

gdb/target-delegates.c

@@ -3579,6 +3579,35 @@ debug_btrace_conf (struct target_ops *self, const struct btrace_target_info *arg
   return result;
 }
 
+static enum record_method
+delegate_record_method (struct target_ops *self, ptid_t arg1)
+{
+  self = self->beneath;
+  return self->to_record_method (self, arg1);
+}
+
+static enum record_method
+tdefault_record_method (struct target_ops *self, ptid_t arg1)
+{
+  return RECORD_METHOD_NONE;
+}
+
+static enum record_method
+debug_record_method (struct target_ops *self, ptid_t arg1)
+{
+  enum record_method result;
+  fprintf_unfiltered (gdb_stdlog, "-> %s->to_record_method (...)\n", debug_target.to_shortname);
+  result = debug_target.to_record_method (&debug_target, arg1);
+  fprintf_unfiltered (gdb_stdlog, "<- %s->to_record_method (", debug_target.to_shortname);
+  target_debug_print_struct_target_ops_p (&debug_target);
+  fputs_unfiltered (", ", gdb_stdlog);
+  target_debug_print_ptid_t (arg1);
+  fputs_unfiltered (") = ", gdb_stdlog);
+  target_debug_print_enum_record_method (result);
+  fputs_unfiltered ("\n", gdb_stdlog);
+  return result;
+}
+
 static void
 delegate_stop_recording (struct target_ops *self)
 {
@@ -4386,6 +4415,8 @@ install_delegators (struct target_ops *ops)
     ops->to_read_btrace = delegate_read_btrace;
   if (ops->to_btrace_conf == NULL)
     ops->to_btrace_conf = delegate_btrace_conf;
+  if (ops->to_record_method == NULL)
+    ops->to_record_method = delegate_record_method;
   if (ops->to_stop_recording == NULL)
     ops->to_stop_recording = delegate_stop_recording;
   if (ops->to_info_record == NULL)
@@ -4565,6 +4596,7 @@ install_dummy_methods (struct target_ops *ops)
   ops->to_teardown_btrace = tdefault_teardown_btrace;
   ops->to_read_btrace = tdefault_read_btrace;
   ops->to_btrace_conf = tdefault_btrace_conf;
+  ops->to_record_method = tdefault_record_method;
   ops->to_stop_recording = tdefault_stop_recording;
   ops->to_info_record = tdefault_info_record;
   ops->to_save_record = tdefault_save_record;
@@ -4723,6 +4755,7 @@ init_debug_target (struct target_ops *ops)
   ops->to_teardown_btrace = debug_teardown_btrace;
   ops->to_read_btrace = debug_read_btrace;
   ops->to_btrace_conf = debug_btrace_conf;
+  ops->to_record_method = debug_record_method;
   ops->to_stop_recording = debug_stop_recording;
   ops->to_info_record = debug_info_record;
   ops->to_save_record = debug_save_record;

gdb/target.c

@@ -3789,6 +3789,14 @@ target_delete_record (void)
 
 /* See target.h.  */
 
+enum record_method
+target_record_method (ptid_t ptid)
+{
+  return current_target.to_record_method (&current_target, ptid);
+}
+
+/* See target.h.  */
+
 int
 target_record_is_replaying (ptid_t ptid)
 {

gdb/target.h

@@ -72,6 +72,7 @@ struct inferior;
 #include "vec.h"
 #include "gdb_signals.h"
 #include "btrace.h"
+#include "record.h"
 #include "command.h"
 
 #include "break-common.h" /* For enum target_hw_bp_type.  */
@@ -1149,6 +1150,10 @@ struct target_ops
 						   const struct btrace_target_info *)
       TARGET_DEFAULT_RETURN (NULL);
 
+    /* Current recording method.  */
+    enum record_method (*to_record_method) (struct target_ops *, ptid_t ptid)
+      TARGET_DEFAULT_RETURN (RECORD_METHOD_NONE);
+
     /* Stop trace recording.  */
     void (*to_stop_recording) (struct target_ops *)
       TARGET_DEFAULT_IGNORE ();
@@ -2495,6 +2500,9 @@ extern int target_supports_delete_record (void);
 /* See to_delete_record in struct target_ops.  */
 extern void target_delete_record (void);
 
+/* See to_record_method.  */
+extern enum record_method target_record_method (ptid_t ptid);
+
 /* See to_record_is_replaying in struct target_ops.  */
 extern int target_record_is_replaying (ptid_t ptid);