gdb: more 'const' in gdb/reggroups.{c,h}

Convert the reggroup_new and reggroup_gdbarch_new functions to return
a 'const regggroup *', and fix up all the fallout.

There should be no user visible changes after this commit.

10 files changed, 39 insertions, 38 deletions

diff --git a/gdb/csky-tdep.c b/gdb/csky-tdep.c
index feb416a2406..3712409dbe8 100644
--- a/gdb/csky-tdep.c
+++ b/gdb/csky-tdep.c
@@ -61,11 +61,11 @@
 /* Control debugging information emitted in this file.  */
 static bool csky_debug = false;
 
-static struct reggroup *cr_reggroup;
-static struct reggroup *fr_reggroup;
-static struct reggroup *vr_reggroup;
-static struct reggroup *mmu_reggroup;
-static struct reggroup *prof_reggroup;
+static const reggroup *cr_reggroup;
+static const reggroup *fr_reggroup;
+static const reggroup *vr_reggroup;
+static const reggroup *mmu_reggroup;
+static const reggroup *prof_reggroup;
 
 /* Convenience function to print debug messages in prologue analysis.  */
 
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index 99a81b98da1..8501e12e241 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -4531,8 +4531,8 @@ i386_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 /* i386 register groups.  In addition to the normal groups, add "mmx"
    and "sse".  */
 
-static struct reggroup *i386_sse_reggroup;
-static struct reggroup *i386_mmx_reggroup;
+static const reggroup *i386_sse_reggroup;
+static const reggroup *i386_mmx_reggroup;
 
 static void
 i386_init_reggroups (void)
diff --git a/gdb/m32c-tdep.c b/gdb/m32c-tdep.c
index 5a767c9ed52..55ef5a551f8 100644
--- a/gdb/m32c-tdep.c
+++ b/gdb/m32c-tdep.c
@@ -35,7 +35,7 @@
 
 /* The m32c tdep structure.  */
 
-static struct reggroup *m32c_dma_reggroup;
+static const reggroup *m32c_dma_reggroup;
 
 /* The type of a function that moves the value of REG between CACHE or
    BUF --- in either direction.  */
diff --git a/gdb/m68hc11-tdep.c b/gdb/m68hc11-tdep.c
index 9d978d88018..5c1f20415c8 100644
--- a/gdb/m68hc11-tdep.c
+++ b/gdb/m68hc11-tdep.c
@@ -1346,8 +1346,8 @@ m68hc11_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 /* 68HC11/68HC12 register groups.
    Identify real hard registers and soft registers used by gcc.  */
 
-static struct reggroup *m68hc11_soft_reggroup;
-static struct reggroup *m68hc11_hard_reggroup;
+static const reggroup *m68hc11_soft_reggroup;
+static const reggroup *m68hc11_hard_reggroup;
 
 static void
 m68hc11_init_reggroups (void)
diff --git a/gdb/mep-tdep.c b/gdb/mep-tdep.c
index 1ab01c6cbb3..6b3a62391c0 100644
--- a/gdb/mep-tdep.c
+++ b/gdb/mep-tdep.c
@@ -1021,9 +1021,9 @@ mep_register_name (struct gdbarch *gdbarch, int regnr)
 
 
 /* Custom register groups for the MeP.  */
-static struct reggroup *mep_csr_reggroup; /* control/special */
-static struct reggroup *mep_cr_reggroup;  /* coprocessor general-purpose */
-static struct reggroup *mep_ccr_reggroup; /* coprocessor control */
+static const reggroup *mep_csr_reggroup; /* control/special */
+static const reggroup *mep_cr_reggroup;  /* coprocessor general-purpose */
+static const reggroup *mep_ccr_reggroup; /* coprocessor control */
 
 
 static int
diff --git a/gdb/nds32-tdep.c b/gdb/nds32-tdep.c
index a94a03ab2ab..06b129bdd31 100644
--- a/gdb/nds32-tdep.c
+++ b/gdb/nds32-tdep.c
@@ -314,16 +314,16 @@ nds32_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int num)
 }
 
 /* NDS32 register groups.  */
-static struct reggroup *nds32_cr_reggroup;
-static struct reggroup *nds32_ir_reggroup;
-static struct reggroup *nds32_mr_reggroup;
-static struct reggroup *nds32_dr_reggroup;
-static struct reggroup *nds32_pfr_reggroup;
-static struct reggroup *nds32_hspr_reggroup;
-static struct reggroup *nds32_dmar_reggroup;
-static struct reggroup *nds32_racr_reggroup;
-static struct reggroup *nds32_idr_reggroup;
-static struct reggroup *nds32_secur_reggroup;
+static const reggroup *nds32_cr_reggroup;
+static const reggroup *nds32_ir_reggroup;
+static const reggroup *nds32_mr_reggroup;
+static const reggroup *nds32_dr_reggroup;
+static const reggroup *nds32_pfr_reggroup;
+static const reggroup *nds32_hspr_reggroup;
+static const reggroup *nds32_dmar_reggroup;
+static const reggroup *nds32_racr_reggroup;
+static const reggroup *nds32_idr_reggroup;
+static const reggroup *nds32_secur_reggroup;
 
 static void
 nds32_init_reggroups (void)
diff --git a/gdb/reggroups.c b/gdb/reggroups.c
index 7b8537e94f6..bb8a83f7653 100644
--- a/gdb/reggroups.c
+++ b/gdb/reggroups.c
@@ -36,7 +36,7 @@ struct reggroup
   enum reggroup_type type;
 };
 
-struct reggroup *
+const reggroup *
 reggroup_new (const char *name, enum reggroup_type type)
 {
   struct reggroup *group = XNEW (struct reggroup);
@@ -48,7 +48,7 @@ reggroup_new (const char *name, enum reggroup_type type)
 
 /* See reggroups.h.  */
 
-struct reggroup *
+const reggroup *
 reggroup_gdbarch_new (struct gdbarch *gdbarch, const char *name,
 		      enum reggroup_type type)
 {
@@ -81,7 +81,7 @@ struct reggroups
 {
   /* Add GROUP to the list of register groups.  */
 
-  void add (struct reggroup *group)
+  void add (const reggroup *group)
   {
     gdb_assert (group != nullptr);
     gdb_assert (std::find (m_groups.begin(), m_groups.end(), group)
@@ -116,7 +116,7 @@ static struct gdbarch_data *reggroups_data;
 /* Add GROUP to the list of register groups for GDBARCH.  */
 
 void
-reggroup_add (struct gdbarch *gdbarch, struct reggroup *group)
+reggroup_add (struct gdbarch *gdbarch, const reggroup *group)
 {
   struct reggroups *groups
     = (struct reggroups *) gdbarch_data (gdbarch, reggroups_data);
diff --git a/gdb/reggroups.h b/gdb/reggroups.h
index 4f0453871fc..8ac372574be 100644
--- a/gdb/reggroups.h
+++ b/gdb/reggroups.h
@@ -39,15 +39,16 @@ extern struct reggroup *const save_reggroup;
 extern struct reggroup *const restore_reggroup;
 
 /* Create a new local register group.  */
-extern struct reggroup *reggroup_new (const char *name,
-				      enum reggroup_type type);
+extern const reggroup *reggroup_new (const char *name,
+				     enum reggroup_type type);
+
 /* Create a new register group allocated onto the gdbarch obstack.  */
-extern struct reggroup *reggroup_gdbarch_new (struct gdbarch *gdbarch,
-					      const char *name,
-					      enum reggroup_type type);
+extern const reggroup *reggroup_gdbarch_new (struct gdbarch *gdbarch,
+					     const char *name,
+					     enum reggroup_type type);
 
 /* Add a register group (with attribute values) to the pre-defined list.  */
-extern void reggroup_add (struct gdbarch *gdbarch, struct reggroup *group);
+extern void reggroup_add (struct gdbarch *gdbarch, const reggroup *group);
 
 /* Register group attributes.  */
 extern const char *reggroup_name (const struct reggroup *reggroup);
diff --git a/gdb/riscv-tdep.c b/gdb/riscv-tdep.c
index 79b81351039..ab239744393 100644
--- a/gdb/riscv-tdep.c
+++ b/gdb/riscv-tdep.c
@@ -129,7 +129,7 @@ struct riscv_unwind_cache
 
 /* RISC-V specific register group for CSRs.  */
 
-static reggroup *csr_reggroup = NULL;
+static const reggroup *csr_reggroup = nullptr;
 
 /* Callback function for user_reg_add.  */
 
diff --git a/gdb/xtensa-tdep.c b/gdb/xtensa-tdep.c
index 6e478ee893d..89bdd7ffd28 100644
--- a/gdb/xtensa-tdep.c
+++ b/gdb/xtensa-tdep.c
@@ -712,10 +712,10 @@ xtensa_pseudo_register_write (struct gdbarch *gdbarch,
 		    _("invalid register number %d"), regnum);
 }
 
-static struct reggroup *xtensa_ar_reggroup;
-static struct reggroup *xtensa_user_reggroup;
-static struct reggroup *xtensa_vectra_reggroup;
-static struct reggroup *xtensa_cp[XTENSA_MAX_COPROCESSOR];
+static const reggroup *xtensa_ar_reggroup;
+static const reggroup *xtensa_user_reggroup;
+static const reggroup *xtensa_vectra_reggroup;
+static const reggroup *xtensa_cp[XTENSA_MAX_COPROCESSOR];
 
 static void
 xtensa_init_reggroups (void)