convert to_can_run

2014-02-19  Tom Tromey  <tromey@redhat.com>

	* target-delegates.c: Rebuild.
	* target.c (update_current_target): Don't inherit or default
	to_can_run.
	(find_default_run_target): Check against delegate_can_run.
	* target.h (struct target_ops) <to_can_run>: Use
	TARGET_DEFAULT_RETURN.

4 files changed, 29 insertions, 6 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 18792c6..9db4fd4 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,6 +1,15 @@
 2014-02-19  Tom Tromey  <tromey@redhat.com>
 
 	* target-delegates.c: Rebuild.
+	* target.c (update_current_target): Don't inherit or default
+	to_can_run.
+	(find_default_run_target): Check against delegate_can_run.
+	* target.h (struct target_ops) <to_can_run>: Use
+	TARGET_DEFAULT_RETURN.
+
+2014-02-19  Tom Tromey  <tromey@redhat.com>
+
+	* target-delegates.c: Rebuild.
 	* target.c (target_disconnect): Unconditionally delegate.
 	* target.h (struct target_ops) <to_disconnect>: Use
 	TARGET_DEFAULT_NORETURN.
diff --git a/gdb/target-delegates.c b/gdb/target-delegates.c
index 1565c78..0ffee5a 100644
--- a/gdb/target-delegates.c
+++ b/gdb/target-delegates.c
@@ -530,6 +530,19 @@ delegate_mourn_inferior (struct target_ops *self)
   self->to_mourn_inferior (self);
 }
 
+static int
+delegate_can_run (struct target_ops *self)
+{
+  self = self->beneath;
+  return self->to_can_run (self);
+}
+
+static int
+tdefault_can_run (struct target_ops *self)
+{
+  return 0;
+}
+
 static void
 delegate_pass_signals (struct target_ops *self, int arg1, unsigned char *arg2)
 {
@@ -1639,6 +1652,8 @@ install_delegators (struct target_ops *ops)
     ops->to_has_exited = delegate_has_exited;
   if (ops->to_mourn_inferior == NULL)
     ops->to_mourn_inferior = delegate_mourn_inferior;
+  if (ops->to_can_run == NULL)
+    ops->to_can_run = delegate_can_run;
   if (ops->to_pass_signals == NULL)
     ops->to_pass_signals = delegate_pass_signals;
   if (ops->to_program_signals == NULL)
@@ -1857,6 +1872,7 @@ install_dummy_methods (struct target_ops *ops)
   ops->to_set_syscall_catchpoint = tdefault_set_syscall_catchpoint;
   ops->to_has_exited = tdefault_has_exited;
   ops->to_mourn_inferior = default_mourn_inferior;
+  ops->to_can_run = tdefault_can_run;
   ops->to_pass_signals = tdefault_pass_signals;
   ops->to_program_signals = tdefault_program_signals;
   ops->to_thread_alive = tdefault_thread_alive;
diff --git a/gdb/target.c b/gdb/target.c
index bf93220..13b2e65 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -653,7 +653,7 @@ update_current_target (void)
       /* Do not inherit to_set_syscall_catchpoint.  */
       /* Do not inherit to_has_exited.  */
       /* Do not inherit to_mourn_inferior.  */
-      INHERIT (to_can_run, t);
+      /* Do not inherit to_can_run.  */
       /* Do not inherit to_pass_signals.  */
       /* Do not inherit to_program_signals.  */
       /* Do not inherit to_thread_alive.  */
@@ -748,9 +748,6 @@ update_current_target (void)
 	    (int (*) (CORE_ADDR, gdb_byte *, int, int,
 		      struct mem_attrib *, struct target_ops *))
 	    nomemory);
-  de_fault (to_can_run,
-	    (int (*) (struct target_ops *))
-	    return_zero);
   current_target.to_read_description = NULL;
 
 #undef de_fault
@@ -2852,7 +2849,7 @@ find_default_run_target (char *do_mesg)
   for (t = target_structs; t < target_structs + target_struct_size;
        ++t)
     {
-      if ((*t)->to_can_run && target_can_run (*t))
+      if ((*t)->to_can_run != delegate_can_run && target_can_run (*t))
 	{
 	  runable = *t;
 	  ++count;
diff --git a/gdb/target.h b/gdb/target.h
index 1ceb74d..ec15e5b 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -547,7 +547,8 @@ struct target_ops
       TARGET_DEFAULT_RETURN (0);
     void (*to_mourn_inferior) (struct target_ops *)
       TARGET_DEFAULT_FUNC (default_mourn_inferior);
-    int (*to_can_run) (struct target_ops *);
+    int (*to_can_run) (struct target_ops *)
+      TARGET_DEFAULT_RETURN (0);
 
     /* Documentation of this routine is provided with the corresponding
        target_* macro.  */