* regcache.c (struct regcache_descr): Rename

	sizeof_raw_register_valid_p field to sizeof_raw_register_status,
	and sizeof_cooked_register_valid_p to
	sizeof_cooked_register_status.
	(init_regcache_descr): Adjust.
	(struct regcache): Rename register_valid_p field to
	register_status.
	(regcache_xmalloc_1, regcache_xfree, regcache_save)
	(do_cooked_read): Adjust.
	(regcache_valid_p): Rename to ...
	(regcache_register_status): ... this.  Adjust.
	(regcache_invalidate): Adjust.
	(regcache_raw_read, regcache_cooked_read, regcache_raw_write):
	Adjust.
	(regcache_raw_supply): Adjust.  If buf i NULL, mark the register
	as unavailable, not valid.
	(regcache_dump): Adjust.
	* regcache.h (enum register_status): New.
	(regcache_register_status): Declare.
	(regcache_invalidate): Delete declaration.
	* corelow.c (get_core_registers): Adjust.
	* tracepoint.c (tfile_fetch_registers): Adjust.
	* trad-frame.c (REG_VALUE): Rename to ...
	(TF_REG_VALUE): ... this.
	(REG_UNKNOWN): Rename to ...
	(TF_REG_UNKNOWN): ... this.
	(trad_frame_set_value, trad_frame_set_unknown): Adjust.
	* mi/mi-main.c (register_changed_p): Adjust.

1 files changed, 21 insertions, 2 deletions

diff --git a/gdb/regcache.h b/gdb/regcache.h
index e5ec1cc..7ae585a 100644
--- a/gdb/regcache.h
+++ b/gdb/regcache.h
@@ -42,6 +42,27 @@ extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
 
 extern struct address_space *get_regcache_aspace (const struct regcache *);
 
+enum register_status
+  {
+    /* The register value is not in the cache, and we don't know yet
+       whether it's available in the target (or traceframe).  */
+    REG_UNKNOWN = 0,
+
+    /* The register value is valid and cached.  */
+    REG_VALID = 1,
+
+    /* The register value is unavailable.  E.g., we're inspecting a
+       traceframe, and this register wasn't collected.  Note that this
+       is different a different "unavailable" from saying the register
+       does not exist in the target's architecture --- in that case,
+       the target should have given us a target description that does
+       not include the register in the first place.  */
+    REG_UNAVAILABLE = -1
+  };
+
+enum register_status regcache_register_status (const struct regcache *regcache,
+					       int regnum);
+
 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
    regcache.  */
 
@@ -65,8 +86,6 @@ void regcache_raw_read_part (struct regcache *regcache, int regnum,
 void regcache_raw_write_part (struct regcache *regcache, int regnum,
 			      int offset, int len, const gdb_byte *buf);
 
-int regcache_valid_p (const struct regcache *regcache, int regnum);
-
 void regcache_invalidate (struct regcache *regcache, int regnum);
 
 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS).  */