[RFC,05/23] X86: Replace regset_alloc() invocations by static regset structures.

diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index df4a3f4..b17bc45 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -2884,6 +2884,16 @@  amd64_collect_xstateregset (const struct regset *regset,
   amd64_collect_xsave (regcache, regnum, xstateregs, 1);
 }
 
+static const struct regset amd64_fpregset =
+  {
+    NULL, amd64_supply_fpregset, amd64_collect_fpregset
+  };
+
+static const struct regset amd64_xstateregset =
+  {
+    NULL, amd64_supply_xstateregset, amd64_collect_xstateregset
+  };
+
 /* Return the appropriate register set for the core section identified
    by SECT_NAME and SECT_SIZE.  */
 
@@ -2894,23 +2904,10 @@  amd64_regset_from_core_section (struct gdbarch *gdbarch,
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
   if (strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset)
-    {
-      if (tdep->fpregset == NULL)
-	tdep->fpregset = regset_alloc (gdbarch, amd64_supply_fpregset,
-				       amd64_collect_fpregset);
-
-      return tdep->fpregset;
-    }
+    return &amd64_fpregset;
 
   if (strcmp (sect_name, ".reg-xstate") == 0)
-    {
-      if (tdep->xstateregset == NULL)
-	tdep->xstateregset = regset_alloc (gdbarch,
-					   amd64_supply_xstateregset,
-					   amd64_collect_xstateregset);
-
-      return tdep->xstateregset;
-    }
+    return &amd64_xstateregset;
 
   return i386_regset_from_core_section (gdbarch, sect_name, sect_size);
 }
diff --git a/gdb/amd64obsd-tdep.c b/gdb/amd64obsd-tdep.c
index c5ed731..e7041c9 100644
--- a/gdb/amd64obsd-tdep.c
+++ b/gdb/amd64obsd-tdep.c
@@ -49,11 +49,17 @@  amd64obsd_supply_regset (const struct regset *regset,
 
   gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE);
 
-  i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
+  i386_gregset.supply_regset (regset, regcache, regnum, regs,
+			      tdep->sizeof_gregset);
   amd64_supply_fxsave (regcache, regnum,
 		       ((const gdb_byte *)regs) + tdep->sizeof_gregset);
 }
 
+static const struct regset amd64obsd_combined_regset =
+  {
+    NULL, amd64obsd_supply_regset, NULL
+  };
+
 static const struct regset *
 amd64obsd_regset_from_core_section (struct gdbarch *gdbarch,
 				    const char *sect_name, size_t sect_size)
@@ -65,11 +71,7 @@  amd64obsd_regset_from_core_section (struct gdbarch *gdbarch,
 
   if (strcmp (sect_name, ".reg") == 0
       && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE)
-    {
-      if (tdep->gregset == NULL)
-        tdep->gregset = regset_alloc (gdbarch, amd64obsd_supply_regset, NULL);
-      return tdep->gregset;
-    }
+    return &amd64obsd_combined_regset;
 
   return NULL;
 }
diff --git a/gdb/i386-cygwin-tdep.c b/gdb/i386-cygwin-tdep.c
index 7b7785a..a23f80e 100644
--- a/gdb/i386-cygwin-tdep.c
+++ b/gdb/i386-cygwin-tdep.c
@@ -96,16 +96,9 @@  static const struct regset *
 i386_windows_regset_from_core_section (struct gdbarch *gdbarch,
 				     const char *sect_name, size_t sect_size)
 {
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
   if (strcmp (sect_name, ".reg") == 0
       && sect_size == I386_WINDOWS_SIZEOF_GREGSET)
-    {
-      if (tdep->gregset == NULL)
-        tdep->gregset = regset_alloc (gdbarch, i386_supply_gregset,
-                                      i386_collect_gregset);
-      return tdep->gregset;
-    }
+    return &i386_gregset;
 
   return NULL;
 }
diff --git a/gdb/i386-nto-tdep.c b/gdb/i386-nto-tdep.c
index 8d8ba10..d005914 100644
--- a/gdb/i386-nto-tdep.c
+++ b/gdb/i386-nto-tdep.c
@@ -82,13 +82,9 @@  i386nto_supply_gregset (struct regcache *regcache, char *gpregs)
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
-  if(tdep->gregset == NULL)
-    tdep->gregset = regset_alloc (gdbarch, i386_supply_gregset,
-				  i386_collect_gregset);
-
   gdb_assert (tdep->gregset_reg_offset == i386nto_gregset_reg_offset);
-  tdep->gregset->supply_regset (tdep->gregset, regcache, -1,
-				gpregs, NUM_GPREGS * 4);
+  i386_gregset.supply_regset (&i386_gregset, regcache, -1,
+			      gpregs, NUM_GPREGS * 4);
 }
 
 static void
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index de783f6..bee27f8 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -3720,7 +3720,7 @@  i386_value_to_register (struct frame_info *frame, int regnum,
    in the general-purpose register set REGSET to register cache
    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
 
-void
+static void
 i386_supply_gregset (const struct regset *regset, struct regcache *regcache,
 		     int regnum, const void *gregs, size_t len)
 {
@@ -3743,7 +3743,7 @@  i386_supply_gregset (const struct regset *regset, struct regcache *regcache,
    general-purpose register set REGSET.  If REGNUM is -1, do this for
    all registers in REGSET.  */
 
-void
+static void
 i386_collect_gregset (const struct regset *regset,
 		      const struct regcache *regcache,
 		      int regnum, void *gregs, size_t len)
@@ -3824,6 +3824,23 @@  i386_collect_xstateregset (const struct regset *regset,
   i387_collect_xsave (regcache, regnum, xstateregs, 1);
 }
 
+/* Register set definitions.  */
+
+const struct regset i386_gregset =
+  {
+    NULL, i386_supply_gregset, i386_collect_gregset
+  };
+
+static const struct regset i386_fpregset =
+  {
+    NULL, i386_supply_fpregset, i386_collect_fpregset
+  };
+
+static const struct regset i386_xstateregset =
+  {
+    NULL, i386_supply_xstateregset, i386_collect_xstateregset
+  };
+
 /* Return the appropriate register set for the core section identified
    by SECT_NAME and SECT_SIZE.  */
 
@@ -3834,32 +3851,15 @@  i386_regset_from_core_section (struct gdbarch *gdbarch,
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
   if (strcmp (sect_name, ".reg") == 0 && sect_size == tdep->sizeof_gregset)
-    {
-      if (tdep->gregset == NULL)
-	tdep->gregset = regset_alloc (gdbarch, i386_supply_gregset,
-				      i386_collect_gregset);
-      return tdep->gregset;
-    }
+      return &i386_gregset;
 
   if ((strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset)
       || (strcmp (sect_name, ".reg-xfp") == 0
 	  && sect_size == I387_SIZEOF_FXSAVE))
-    {
-      if (tdep->fpregset == NULL)
-	tdep->fpregset = regset_alloc (gdbarch, i386_supply_fpregset,
-				       i386_collect_fpregset);
-      return tdep->fpregset;
-    }
+    return &i386_fpregset;
 
   if (strcmp (sect_name, ".reg-xstate") == 0)
-    {
-      if (tdep->xstateregset == NULL)
-	tdep->xstateregset = regset_alloc (gdbarch,
-					   i386_supply_xstateregset,
-					   i386_collect_xstateregset);
-
-      return tdep->xstateregset;
-    }
+    return &i386_xstateregset;
 
   return NULL;
 }
@@ -8283,17 +8283,13 @@  i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   gdbarch = gdbarch_alloc (&info, tdep);
 
   /* General-purpose registers.  */
-  tdep->gregset = NULL;
   tdep->gregset_reg_offset = NULL;
   tdep->gregset_num_regs = I386_NUM_GREGS;
   tdep->sizeof_gregset = 0;
 
   /* Floating-point registers.  */
-  tdep->fpregset = NULL;
   tdep->sizeof_fpregset = I387_SIZEOF_FSAVE;
 
-  tdep->xstateregset = NULL;
-
   /* The default settings include the FPU registers, the MMX registers
      and the SSE registers.  This can be overridden for a specific ABI
      by adjusting the members `st0_regnum', `mm0_regnum' and
diff --git a/gdb/i386-tdep.h b/gdb/i386-tdep.h
index 2ada2bd..fd601f2 100644
--- a/gdb/i386-tdep.h
+++ b/gdb/i386-tdep.h
@@ -56,18 +56,13 @@  enum struct_return
 struct gdbarch_tdep
 {
   /* General-purpose registers.  */
-  struct regset *gregset;
   int *gregset_reg_offset;
   int gregset_num_regs;
   size_t sizeof_gregset;
 
   /* Floating-point registers.  */
-  struct regset *fpregset;
   size_t sizeof_fpregset;
 
-  /* XSAVE extended state.  */
-  struct regset *xstateregset;
-
   /* Register number for %st(0).  The register numbers for the other
      registers follow from this one.  Set this to -1 to indicate the
      absence of an FPU.  */
@@ -382,20 +377,8 @@  extern int i386_sigtramp_p (struct frame_info *this_frame);
 extern int i386_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 				     struct reggroup *group);
 
-/* Supply register REGNUM from the general-purpose register set REGSET
-   to register cache REGCACHE.  If REGNUM is -1, do this for all
-   registers in REGSET.  */
-extern void i386_supply_gregset (const struct regset *regset,
-				 struct regcache *regcache, int regnum,
-				 const void *gregs, size_t len);
-
-/* Collect register REGNUM from the register cache REGCACHE and store
-   it in the buffer specified by GREGS and LEN as described by the
-   general-purpose register set REGSET.  If REGNUM is -1, do this for
-   all registers in REGSET.  */
-extern void i386_collect_gregset (const struct regset *regset,
-				  const struct regcache *regcache,
-				  int regnum, void *gregs, size_t len);
+/* General-purpose register set. */
+extern const struct regset i386_gregset;
 
 /* Return the appropriate register set for the core section identified
    by SECT_NAME and SECT_SIZE.  */
diff --git a/gdb/i386obsd-tdep.c b/gdb/i386obsd-tdep.c
index bc29606..46b4719 100644
--- a/gdb/i386obsd-tdep.c
+++ b/gdb/i386obsd-tdep.c
@@ -147,10 +147,16 @@  i386obsd_aout_supply_regset (const struct regset *regset,
 
   gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE);
 
-  i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
+  i386_gregset.supply_regset (regset, regcache, regnum, regs,
+			      tdep->sizeof_gregset);
   i387_supply_fsave (regcache, regnum, gregs + tdep->sizeof_gregset);
 }
 
+static const struct regset i386obsd_aout_gregset =
+  {
+    NULL, i386obsd_aout_supply_regset, NULL
+  };
+
 static const struct regset *
 i386obsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
 					const char *sect_name,
@@ -163,12 +169,7 @@  i386obsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
 
   if (strcmp (sect_name, ".reg") == 0
       && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE)
-    {
-      if (tdep->gregset == NULL)
-        tdep->gregset =
-	  regset_alloc (gdbarch, i386obsd_aout_supply_regset, NULL);
-      return tdep->gregset;
-    }
+    return &i386obsd_aout_gregset;
 
   return NULL;
 }