introduce the target stack

there's a huge hack in multi_target_compatible

2014-07-29  Tom Tromey  <tromey@redhat.com>

	* target-delegates.c: Rebuild.
	* make-target-delegates (write_debugmethod): Update for change to
	debug_target.
	* progspace.c (add_program_space): Acquire a reference to the
	target stack.
	(release_program_space): Release reference to the program space.
	(set_current_program_space): Set the target stack.
	* progspace.h (struct program_space) <target_stack>: New field.
	* target.c (target_ops_ptr): New typedef.
	(struct target_stack): New.
	(target_stack): Change type.
	(current_target): Update comment.
	(update_current_target): Update.
	(multi_target_compatible, ensure_multi_target_ok): New functions.
	(push_target): Update.  Add multi-target check.
	(unpush_target, pop_all_targets_above, target_is_pushed)
	(target_info, target_require_runnable): Update.
	(target_stack_set): New global.
	(currently_multi_target, target_stack_incref, target_stack_decref)
	(target_stack_set_current, new_target_stack): New functions.
	(maintenance_print_target_stack): Update.
	(initialize_targets): Initialize target_stack_set, target_stack.
	Update.
	(target_stack_id): New function.
	(next_available_target_id): New global.
	(print_one_target_stack): New function.
	(maintenance_print_target_stack): Move earlier.  Rewrite.
	(debug_target): Remove.
	(debug_to_open, setup_target_debug): Update.
	* target.h (target_stack_incref, target_stack_decref)
	(target_stack_set_current, new_target_stack, target_stack_id):
	Declare.
        * testsuite/gdb.base/auto-connect-native-target.exp: Update.

1 files changed, 23 insertions, 0 deletions

diff --git a/gdb/target.h b/gdb/target.h
index e319271..78610bf 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -39,6 +39,7 @@ struct traceframe_info;
 struct expression;
 struct dcache_struct;
 struct inferior;
+struct target_stack;
 
 #include "infrun.h" /* For enum exec_direction_kind.  */
 #include "breakpoint.h" /* For enum bptype.  */
@@ -1256,6 +1257,28 @@ struct target_ops
 
 #define	OPS_MAGIC	3840
 
+/* Acquire a reference to the target stack.  */
+
+extern struct target_stack *target_stack_incref (void);
+
+/* Release a reference to the target stack.  */
+
+extern void target_stack_decref (struct target_stack *);
+
+/* Set target_stack and current_target from TSTACK.  */
+
+extern void target_stack_set_current (struct target_stack *tstack);
+
+/* Create a new "empty" target stack and return it.  The current
+   target stack is not changed.  The new stack is initialized with a
+   single reference count, which is owned by the caller.  */
+
+extern struct target_stack *new_target_stack (void);
+
+/* Return the numeric identifier of the current target stack.  */
+
+extern int target_stack_id (void);
+
 /* The ops structure for our "current" target process.  This should
    never be NULL.  If there is no target, it points to the dummy_target.  */