Add reg_buffer_common

A purely virtual class containing functions from gdb/regcache.h

Both the gdb regcache structures and gdbserver regcache inherit
directly from reg_buffer_common. This will allow for common
functions which require the use of a regcache.

gdb/
	* common/common-regcache.h (reg_buffer_common): New structure.
	* regcache.c (reg_buffer::invalidate): Move from detached_regcache.
	(reg_buffer::raw_supply): Likewise.
	(reg_buffer::raw_supply_integer): Likewise.
	(reg_buffer::raw_supply_zeroed): Likewise.
	(reg_buffer::raw_collect): Likewise.
	(reg_buffer::raw_collect_integer): Likewise.
	* regcache.h (reg_buffer::invalidate): Move from detached_regcache.
	(reg_buffer::raw_supply): Likewise.
	(reg_buffer::raw_supply_integer): Likewise.
	(reg_buffer::raw_supply_zeroed): Likewise.
	(reg_buffer::raw_collect): Likewise.
	(reg_buffer::raw_collect_integer): Likewise.

gdbserver/
	* regcache.c (new_register_cache): Use new.
	(free_register_cache): Use delete.
	(register_data): Use const.
	(supply_register): Move body inside regcache.
	(regcache::raw_supply): New override function.
	(collect_register): Move body inside regcache.
	(regcache::raw_collect): New override function.
	(regcache::get_register_status): New override function.
	* regcache.h (struct regcache): Inherit from reg_buffer_common.

1 files changed, 15 insertions, 0 deletions

diff --git a/gdb/common/common-regcache.h b/gdb/common/common-regcache.h
index 9709ba4..4e6bdde 100644
--- a/gdb/common/common-regcache.h
+++ b/gdb/common/common-regcache.h
@@ -62,4 +62,19 @@ extern enum register_status regcache_raw_read_unsigned
 
 ULONGEST regcache_raw_get_unsigned (struct regcache *regcache, int regnum);
 
+struct reg_buffer_common
+{
+  virtual ~reg_buffer_common () = default;
+
+  /* Get the availability status of the value of register REGNUM in this
+     buffer.  */
+  virtual register_status get_register_status (int regnum) const = 0;
+
+  /* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE.  */
+  virtual void raw_supply (int regnum, const void *buf) = 0;
+
+  /* Collect register REGNUM from REGCACHE and store its contents in BUF.  */
+  virtual void raw_collect (int regnum, void *buf) const = 0;
+};
+
 #endif /* COMMON_REGCACHE_H */