[patch 3/8] New target hook `to_can_download_tracepoint_loc'

[Yao Qi <yao@codesourcery.com>]

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This patch is to add a new target hook 'to_can_download_tracepoint_loc'
to determine whether it is OK for remote target to receive tracepoint
locations.

Note that, `download_tracepoint_loc' itself can check this in lower
level, but it is not efficient, and it leaves managing location's status
to lower level.

This patch is needed by patch 4/8.

-- 
Yao (齐尧)

[-- Attachment #2: 0003-new-target-hook-can_download_tracepoint_loc.patch --]
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        * target.h (struct target): New field
        `to_can_download_tracepoint_loc'.
        (target_can_download_tracepoint_loc): New macro.
        * target.c (update_current_target): Update.
        * remote.c (remote_can_download_tracepoint_loc): New.
---
 gdb/remote.c |   19 +++++++++++++++++++
 gdb/target.c |    4 ++++
 gdb/target.h |    7 +++++++
 3 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/gdb/remote.c b/gdb/remote.c
index c34d47b..5ba497a 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -10036,6 +10036,24 @@ remote_download_tracepoint_loc (struct bp_location *loc)
 
 }
 
+static int
+remote_can_download_tracepoint_loc ()
+{
+  struct trace_status *ts = current_trace_status ();
+  int status = remote_get_trace_status (ts);
+
+  if (status == -1 || !ts->running_known || !ts->running)
+    return 0;
+
+  /* If we are in a tracing experiment, but remote stub doesn't support
+     installing tracepoint in trace, we have to return.  */
+  if (!remote_supports_install_in_trace ())
+    return 0;
+
+  return 1;
+}
+
+
 static void
 remote_download_trace_state_variable (struct trace_state_variable *tsv)
 {
@@ -10508,6 +10526,7 @@ Specify the serial device it is connected to\n\
   remote_ops.to_supports_string_tracing = remote_supports_string_tracing;
   remote_ops.to_trace_init = remote_trace_init;
   remote_ops.to_download_tracepoint_loc = remote_download_tracepoint_loc;
+  remote_ops.to_can_download_tracepoint_loc = remote_can_download_tracepoint_loc;
   remote_ops.to_download_trace_state_variable
     = remote_download_trace_state_variable;
   remote_ops.to_enable_tracepoint = remote_enable_tracepoint;
diff --git a/gdb/target.c b/gdb/target.c
index 48cd888..d236530 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -675,6 +675,7 @@ update_current_target (void)
       INHERIT (to_supports_string_tracing, t);
       INHERIT (to_trace_init, t);
       INHERIT (to_download_tracepoint_loc, t);
+      INHERIT (to_can_download_tracepoint_loc, t);
       INHERIT (to_download_trace_state_variable, t);
       INHERIT (to_enable_tracepoint, t);
       INHERIT (to_disable_tracepoint, t);
@@ -850,6 +851,9 @@ update_current_target (void)
   de_fault (to_download_tracepoint_loc,
 	    (int (*) (struct bp_location *))
 	    tcomplain);
+  de_fault (to_can_download_tracepoint_loc,
+	    (int (*) (void))
+	    return_zero);
   de_fault (to_download_trace_state_variable,
 	    (void (*) (struct trace_state_variable *))
 	    tcomplain);
diff --git a/gdb/target.h b/gdb/target.h
index 74e1d8a..69a2a32 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -693,6 +693,10 @@ struct target_ops
        otherwise return 1.  */
     int (*to_download_tracepoint_loc) (struct bp_location *location);
 
+    /* Can the target be able to download tracepoint locations in current
+       status?  */
+    int (*to_can_download_tracepoint_loc) (void);
+
     /* Send full details of a trace state variable to the target.  */
     void (*to_download_trace_state_variable) (struct trace_state_variable *tsv);
 
@@ -1481,6 +1485,9 @@ extern int target_search_memory (CORE_ADDR start_addr,
 #define target_download_tracepoint_loc(t) \
   (*current_target.to_download_tracepoint_loc) (t)
 
+#define target_can_download_tracepoint_loc() \
+  (*current_target.to_can_download_tracepoint_loc) ()
+
 #define target_download_trace_state_variable(tsv) \
   (*current_target.to_download_trace_state_variable) (tsv)
 
-- 
1.7.0.4