[RFC v2 05/38] convert to_supports_btrace

[Tom Tromey <tromey@redhat.com>]

This adds a "self" argument to to_supports_btrace.  Due to how one
implementation of this method is shared with gdbserver this required a
small change to gdbserver as well.

2014-02-06  Tom Tromey  <tromey@redhat.com>

	* common/linux-btrace.c (linux_supports_btrace): Add "ops"
	argument.
	* common/linux-btrace.h (linux_supports_btrace): Update.
	* remote.c (remote_supports_btrace): Add "self" argument.
	* target-delegates.c: Rebuild.
	* target.c (target_supports_btrace): Remove.
	* target.h (struct target_ops) <to_supports_btrace>: Add
	target_ops argument.
	(target_supports_btrace): New define.

2014-02-06  Tom Tromey  <tromey@redhat.com>

	* target.h (struct target_ops) <supports_btrace>: Add target_ops
	argument.
	(target_supports_btrace): Update.
---
 gdb/ChangeLog             | 12 ++++++++++++
 gdb/common/linux-btrace.c |  4 ++--
 gdb/common/linux-btrace.h |  2 +-
 gdb/gdbserver/ChangeLog   |  6 ++++++
 gdb/gdbserver/target.h    |  7 ++++---
 gdb/remote.c              |  2 +-
 gdb/target-delegates.c    | 16 ++++++++++++++++
 gdb/target.c              | 14 --------------
 gdb/target.h              |  6 ++++--
 9 files changed, 46 insertions(+), 23 deletions(-)

diff --git a/gdb/common/linux-btrace.c b/gdb/common/linux-btrace.c
index 218e0ce..188220b 100644
--- a/gdb/common/linux-btrace.c
+++ b/gdb/common/linux-btrace.c
@@ -407,7 +407,7 @@ cpu_supports_btrace (void)
 /* See linux-btrace.h.  */
 
 int
-linux_supports_btrace (void)
+linux_supports_btrace (struct target_ops *ops)
 {
   static int cached;
 
@@ -600,7 +600,7 @@ linux_read_btrace (VEC (btrace_block_s) **btrace,
 /* See linux-btrace.h.  */
 
 int
-linux_supports_btrace (void)
+linux_supports_btrace (struct target_ops *ops)
 {
   return 0;
 }
diff --git a/gdb/common/linux-btrace.h b/gdb/common/linux-btrace.h
index a97b697..12e9b60 100644
--- a/gdb/common/linux-btrace.h
+++ b/gdb/common/linux-btrace.h
@@ -62,7 +62,7 @@ struct btrace_target_info
 };
 
 /* See to_supports_btrace in target.h.  */
-extern int linux_supports_btrace (void);
+extern int linux_supports_btrace (struct target_ops *);
 
 /* See to_enable_btrace in target.h.  */
 extern struct btrace_target_info *linux_enable_btrace (ptid_t ptid);
diff --git a/gdb/gdbserver/target.h b/gdb/gdbserver/target.h
index ae48cd7..7374d58 100644
--- a/gdb/gdbserver/target.h
+++ b/gdb/gdbserver/target.h
@@ -350,7 +350,7 @@ struct target_ops
   int (*supports_agent) (void);
 
   /* Check whether the target supports branch tracing.  */
-  int (*supports_btrace) (void);
+  int (*supports_btrace) (struct target_ops *);
 
   /* Enable branch tracing for @ptid and allocate a branch trace target
      information struct for reading and for disabling branch trace.  */
@@ -491,8 +491,9 @@ int kill_inferior (int);
   (the_target->supports_agent ? \
    (*the_target->supports_agent) () : 0)
 
-#define target_supports_btrace() \
-  (the_target->supports_btrace ? (*the_target->supports_btrace) () : 0)
+#define target_supports_btrace()			\
+  (the_target->supports_btrace				\
+   ? (*the_target->supports_btrace) (the_target) : 0)
 
 #define target_enable_btrace(ptid) \
   (*the_target->enable_btrace) (ptid)
diff --git a/gdb/remote.c b/gdb/remote.c
index c6767d4..1996571 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -11389,7 +11389,7 @@ struct btrace_target_info
 /* Check whether the target supports branch tracing.  */
 
 static int
-remote_supports_btrace (void)
+remote_supports_btrace (struct target_ops *self)
 {
   if (remote_protocol_packets[PACKET_Qbtrace_off].support != PACKET_ENABLE)
     return 0;
diff --git a/gdb/target-delegates.c b/gdb/target-delegates.c
index 8f28321..a7877cc 100644
--- a/gdb/target-delegates.c
+++ b/gdb/target-delegates.c
@@ -122,6 +122,19 @@ tdefault_xfer_partial (struct target_ops *self, enum target_object  arg1, const
   return -1;
 }
 
+static int
+delegate_supports_btrace (struct target_ops *self)
+{
+  self = self->beneath;
+  return self->to_supports_btrace (self);
+}
+
+static int
+tdefault_supports_btrace (struct target_ops *self)
+{
+  return 0;
+}
+
 static void
 install_delegators (struct target_ops *ops)
 {
@@ -147,6 +160,8 @@ install_delegators (struct target_ops *ops)
     ops->to_async = delegate_async;
   if (ops->to_xfer_partial == NULL)
     ops->to_xfer_partial = delegate_xfer_partial;
+  if (ops->to_supports_btrace == NULL)
+    ops->to_supports_btrace = delegate_supports_btrace;
 }
 
 static void
@@ -163,4 +178,5 @@ install_dummy_methods (struct target_ops *ops)
   ops->to_is_async_p = find_default_is_async_p;
   ops->to_async = tdefault_async;
   ops->to_xfer_partial = tdefault_xfer_partial;
+  ops->to_supports_btrace = tdefault_supports_btrace;
 }
diff --git a/gdb/target.c b/gdb/target.c
index bde91ab..8ab9cbf 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -4109,20 +4109,6 @@ target_ranged_break_num_registers (void)
 
 /* See target.h.  */
 
-int
-target_supports_btrace (void)
-{
-  struct target_ops *t;
-
-  for (t = current_target.beneath; t != NULL; t = t->beneath)
-    if (t->to_supports_btrace != NULL)
-      return t->to_supports_btrace ();
-
-  return 0;
-}
-
-/* See target.h.  */
-
 struct btrace_target_info *
 target_enable_btrace (ptid_t ptid)
 {
diff --git a/gdb/target.h b/gdb/target.h
index 8d00d3a..76a2d1b 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -859,7 +859,8 @@ struct target_ops
     int (*to_can_use_agent) (void);
 
     /* Check whether the target supports branch tracing.  */
-    int (*to_supports_btrace) (void);
+    int (*to_supports_btrace) (struct target_ops *)
+      TARGET_DEFAULT_RETURN (0);
 
     /* Enable branch tracing for PTID and allocate a branch trace target
        information struct for reading and for disabling branch trace.  */
@@ -2019,7 +2020,8 @@ extern void update_target_permissions (void);
 void target_ignore (void);
 
 /* See to_supports_btrace in struct target_ops.  */
-extern int target_supports_btrace (void);
+#define target_supports_btrace() \
+  (current_target.to_supports_btrace (&current_target))
 
 /* See to_enable_btrace in struct target_ops.  */
 extern struct btrace_target_info *target_enable_btrace (ptid_t ptid);
-- 
1.8.1.4