From ffa0f56b660b1e3e0c160257b2090a0ec1de3ceb Mon Sep 17 00:00:00 2001
From: Daniel Jacobowitz <drow@false.org>
Date: Mon, 27 Mar 2006 19:11:10 +0000
Subject: Basic register group support.

---
 gdb/Makefile.in              |  1 +
 gdb/arm-tdep.c               |  1 +
 gdb/available.c              | 42 ++++++++++++++++++++++++++++++++++++++++++
 gdb/available.h              |  6 ++++++
 gdb/features/feature_to_c.sh |  5 +++++
 5 files changed, 55 insertions(+)

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 323e00c85f9..81761346715 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -1812,6 +1812,7 @@ auxv.o: auxv.c $(defs_h) $(target_h) $(gdbtypes_h) $(command_h) \
 	$(elf_common_h)
 available.o: available.c $(defs_h) $(symfile_h) $(target_h) $(available_h) \
 	$(arch_utils_h) $(exceptions_h) $(gdbtypes_h) $(sha1_h) \
+	$(reggroups_h) \
 	$(gdb_string) $(gdb_assert) $(gdb_obstack_h) $(gdb_stdint_h)
 avr-tdep.o: avr-tdep.c $(defs_h) $(frame_h) $(frame_unwind_h) \
 	$(frame_base_h) $(trad_frame_h) $(gdbcmd_h) $(gdbcore_h) \
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index f8f4dd6ffbb..cf8bbff3e4a 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -2825,6 +2825,7 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM);
   set_gdbarch_num_regs (gdbarch, NUM_GREGS + NUM_FREGS + NUM_SREGS);
   set_gdbarch_register_type (gdbarch, arm_register_type);
+  set_gdbarch_register_reggroup_p (gdbarch, available_register_reggroup_p);
 
   if (info.feature_set)
     {
diff --git a/gdb/available.c b/gdb/available.c
index def0c02b4ed..4087e13466b 100644
--- a/gdb/available.c
+++ b/gdb/available.c
@@ -26,6 +26,7 @@
 #include "arch-utils.h"
 #include "exceptions.h"
 #include "gdbtypes.h"
+#include "reggroups.h"
 #include "symfile.h"
 #include "target.h"
 #include "sha1.h"
@@ -677,3 +678,44 @@ available_register_target_regnum (struct gdbarch *gdbarch, int regnum)
 
   return reg->protocol_number;
 }
+
+/* Check whether REGNUM is a member of REGGROUP.  */
+
+/* TODO: This function only supports "info registers", "info float",
+   and "info vector".  Registers with group="general" go in general;
+   group="float" and group="vector" are similar.  Other specified
+   values of group go into all-registers only.  Registers with no
+   group specified go to the default function and are handled by
+   type.  When we have a hierarchy of features, it may make more
+   sense to use that to show registers.  */
+
+int
+available_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+			       struct reggroup *reggroup)
+{
+  struct gdb_available_register *reg;
+
+  reg = find_register (gdbarch_feature_set (gdbarch), regnum);
+  if (reg != NULL && reg->group != NULL)
+    {
+      int general_p, float_p, vector_p;
+
+      if (strcmp (reg->group, "general") == 0)
+	general_p = 1;
+      else if (strcmp (reg->group, "float") == 0)
+	float_p = 1;
+      else if (strcmp (reg->group, "vector") == 0)
+	vector_p = 1;
+
+      if (reggroup == float_reggroup)
+	return float_p;
+
+      if (reggroup == vector_reggroup)
+	return vector_p;
+
+      if (reggroup == general_reggroup)
+	return general_p;
+    }
+
+  return default_register_reggroup_p (gdbarch, regnum, reggroup);
+}
diff --git a/gdb/available.h b/gdb/available.h
index 7b35e40d8b2..d437c752e70 100644
--- a/gdb/available.h
+++ b/gdb/available.h
@@ -26,6 +26,7 @@
 #define AVAILABLE_H 1
 
 struct obstack;
+struct reggroup;
 
 /* A GDB target interface can use these types to communicate to the
    architecture support (gdbarch) what new or optional features
@@ -174,6 +175,11 @@ const char *available_register_name (struct gdbarch *, int);
 
 int available_register_target_regnum (struct gdbarch *, int);
 
+/* Check the register group of a target-described register.  */
+
+int available_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+				   struct reggroup *reggroup);
+
 /* Find a compiled-in XML file, e.g. the standard DTD.  */
 
 const char *fetch_xml_builtin (const char *);
diff --git a/gdb/features/feature_to_c.sh b/gdb/features/feature_to_c.sh
index 764297725ee..b9441a4a1b2 100644
--- a/gdb/features/feature_to_c.sh
+++ b/gdb/features/feature_to_c.sh
@@ -8,6 +8,11 @@ if test -z "$output" || test -z "$1"; then
   exit 1
 fi
 
+if test -e "$output"; then
+  echo "Output file \"$output\" already exists; refusing to overwrite."
+  exit 1
+fi
+
 for input in dummy "$@"; do
   if test $input != dummy; then
     arrayname=xml_feature_`echo $input | sed 's,.*/,,; s/[-.]/_/g'`
-- 
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