Re: [RFA] Resubmit reverse debugging [1/5]

[Michael Snyder <msnyder at vmware dot com>]

Committed, as attached:

2008-10-17  Michael Snyder  <msnyder@vmware.com>

	Target interface for reverse debugging.
	* target.h (enum target_waitkind): 
	Add new wait event, TARGET_WAITKIND_NO_HISTORY.
	(struct target_ops): New method to_can_execute_reverse.
	(target_can_execute_reverse): New macro.
	* target.c (update_current_target): Inherit to_can_execute_reverse.

Index: target.h
===================================================================
RCS file: /cvs/src/src/gdb/target.h,v
retrieving revision 1.131
diff -u -p -r1.131 target.h
--- target.h	16 Oct 2008 14:03:18 -0000	1.131
+++ target.h	17 Oct 2008 19:03:10 -0000
@@ -128,7 +128,11 @@ enum target_waitkind
        inferior, rather than being stuck in the remote_async_wait()
        function. This way the event loop is responsive to other events,
        like for instance the user typing.  */
-    TARGET_WAITKIND_IGNORE
+    TARGET_WAITKIND_IGNORE,
+
+    /* The target has run out of history information,
+       and cannot run backward any further.  */
+    TARGET_WAITKIND_NO_HISTORY
   };
 
 struct target_waitstatus
@@ -523,6 +527,9 @@ struct target_ops
 			     const gdb_byte *pattern, ULONGEST pattern_len,
 			     CORE_ADDR *found_addrp);
 
+    /* Can target execute in reverse?  */
+    int (*to_can_execute_reverse) ();
+
     int to_magic;
     /* Need sub-structure for target machine related rather than comm related?
      */
@@ -1127,6 +1134,11 @@ extern int target_stopped_data_address_p
 #define target_watchpoint_addr_within_range(target, addr, start, length) \
   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
 
+/* Target can execute in reverse?  */
+#define target_can_execute_reverse \
+     (current_target.to_can_execute_reverse ? \
+      current_target.to_can_execute_reverse () : 0)
+
 extern const struct target_desc *target_read_description (struct target_ops *);
 
 /* Utility implementation of searching memory.  */
Index: target.c
===================================================================
RCS file: /cvs/src/src/gdb/target.c,v
retrieving revision 1.186
diff -u -p -r1.186 target.c
--- target.c	14 Oct 2008 20:49:02 -0000	1.186
+++ target.c	17 Oct 2008 19:03:10 -0000
@@ -455,6 +455,7 @@ update_current_target (void)
       INHERIT (to_find_memory_regions, t);
       INHERIT (to_make_corefile_notes, t);
       INHERIT (to_get_thread_local_address, t);
+      INHERIT (to_can_execute_reverse, t);
       /* Do not inherit to_read_description.  */
       /* Do not inherit to_search_memory.  */
       INHERIT (to_magic, t);