gdb: remove gdbarch_info_init

[thirdparty/binutils-gdb.git] / gdb / arch-utils.c

diff --git a/gdb/arch-utils.c b/gdb/arch-utils.c
index 2786544d22d973a5c73d82ec39e6509d40b5c764..4290d637ce16dfa803e41002632868645bfc0a36 100644 (file)
--- a/gdb/arch-utils.c
+++ b/gdb/arch-utils.c
@@ -1,6 +1,6 @@
 /* Dynamic architecture support for GDB, the GNU debugger.
 
-   Copyright (C) 1998-2020 Free Software Foundation, Inc.
+   Copyright (C) 1998-2021 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -77,6 +77,55 @@ legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum)
     return LEGACY_SIM_REGNO_IGNORE;
 }
 
+
+/* See arch-utils.h */
+
+std::string
+default_memtag_to_string (struct gdbarch *gdbarch, struct value *tag)
+{
+  error (_("This architecture has no method to convert a memory tag to"
+          " a string."));
+}
+
+/* See arch-utils.h */
+
+bool
+default_tagged_address_p (struct gdbarch *gdbarch, struct value *address)
+{
+  /* By default, assume the address is untagged.  */
+  return false;
+}
+
+/* See arch-utils.h */
+
+bool
+default_memtag_matches_p (struct gdbarch *gdbarch, struct value *address)
+{
+  /* By default, assume the tags match.  */
+  return true;
+}
+
+/* See arch-utils.h */
+
+bool
+default_set_memtags (struct gdbarch *gdbarch, struct value *address,
+                    size_t length, const gdb::byte_vector &tags,
+                    memtag_type tag_type)
+{
+  /* By default, return true (successful);  */
+  return true;
+}
+
+/* See arch-utils.h */
+
+struct value *
+default_get_memtag (struct gdbarch *gdbarch, struct value *address,
+                   memtag_type tag_type)
+{
+  /* By default, return no tag.  */
+  return nullptr;
+}
+
 CORE_ADDR
 generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
 {
@@ -230,7 +279,13 @@ default_floatformat_for_type (struct gdbarch *gdbarch,
 {
   const struct floatformat **format = NULL;
 
-  if (len == gdbarch_half_bit (gdbarch))
+  /* Check if this is a bfloat16 type.  It has the same size as the
+     IEEE half float type, so we use the base type name to tell them
+     apart.  */
+  if (name != nullptr && strcmp (name, "__bf16") == 0
+      && len == gdbarch_bfloat16_bit (gdbarch))
+    format = gdbarch_bfloat16_format (gdbarch);
+  else if (len == gdbarch_half_bit (gdbarch))
     format = gdbarch_half_format (gdbarch);
   else if (len == gdbarch_float_bit (gdbarch))
     format = gdbarch_float_format (gdbarch);
@@ -334,8 +389,6 @@ set_endian (const char *ignore_args, int from_tty, struct cmd_list_element *c)
 {
   struct gdbarch_info info;
 
-  gdbarch_info_init (&info);
-
   if (set_endian_string == endian_auto)
     {
       target_byte_order_user = BFD_ENDIAN_UNKNOWN;
@@ -493,8 +546,6 @@ set_architecture (const char *ignore_args,
 {
   struct gdbarch_info info;
 
-  gdbarch_info_init (&info);
-
   if (strcmp (set_architecture_string, "auto") == 0)
     {
       target_architecture_user = NULL;
@@ -575,7 +626,6 @@ struct gdbarch *
 gdbarch_from_bfd (bfd *abfd)
 {
   struct gdbarch_info info;
-  gdbarch_info_init (&info);
 
   info.abfd = abfd;
   return gdbarch_find_by_info (info);
@@ -590,7 +640,6 @@ set_gdbarch_from_file (bfd *abfd)
   struct gdbarch_info info;
   struct gdbarch *gdbarch;
 
-  gdbarch_info_init (&info);
   info.abfd = abfd;
   info.target_desc = target_current_description ();
   gdbarch = gdbarch_find_by_info (info);
@@ -624,10 +673,6 @@ void
 initialize_current_architecture (void)
 {
   const char **arches = gdbarch_printable_names ();
-  struct gdbarch_info info;
-
-  /* determine a default architecture and byte order.  */
-  gdbarch_info_init (&info);
   
   /* Find a default architecture.  */
   if (default_bfd_arch == NULL)
@@ -650,6 +695,7 @@ initialize_current_architecture (void)
                        _("initialize_current_architecture: Arch not found"));
     }
 
+  gdbarch_info info;
   info.bfd_arch_info = default_bfd_arch;
 
   /* Take several guesses at a byte order.  */
@@ -702,31 +748,18 @@ initialize_current_architecture (void)
     arches = XRESIZEVEC (const char *, arches, nr + 2);
     arches[nr + 0] = "auto";
     arches[nr + 1] = NULL;
-    add_setshow_enum_cmd ("architecture", class_support,
-                         arches, &set_architecture_string, 
-                         _("Set architecture of target."),
-                         _("Show architecture of target."), NULL,
-                         set_architecture, show_architecture,
-                         &setlist, &showlist);
-    add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
+    set_show_commands architecture_cmds
+      = add_setshow_enum_cmd ("architecture", class_support,
+                             arches, &set_architecture_string,
+                             _("Set architecture of target."),
+                             _("Show architecture of target."), NULL,
+                             set_architecture, show_architecture,
+                             &setlist, &showlist);
+    add_alias_cmd ("processor", architecture_cmds.set, class_support, 1,
+                  &setlist);
   }
 }
 
-
-/* Initialize a gdbarch info to values that will be automatically
-   overridden.  Note: Originally, this ``struct info'' was initialized
-   using memset(0).  Unfortunately, that ran into problems, namely
-   BFD_ENDIAN_BIG is zero.  An explicit initialization function that
-   can explicitly set each field to a well defined value is used.  */
-
-void
-gdbarch_info_init (struct gdbarch_info *info)
-{
-  memset (info, 0, sizeof (struct gdbarch_info));
-  info->byte_order = BFD_ENDIAN_UNKNOWN;
-  info->byte_order_for_code = info->byte_order;
-}
-
 /* Similar to init, but this time fill in the blanks.  Information is
    obtained from the global "set ..." options and explicitly
    initialized INFO fields.  */
@@ -950,13 +983,15 @@ default_gnu_triplet_regexp (struct gdbarch *gdbarch)
   return gdbarch_bfd_arch_info (gdbarch)->arch_name;
 }
 
-/* Default method for gdbarch_addressable_memory_unit_size.  By default, a memory byte has
-   a size of 1 octet.  */
+/* Default method for gdbarch_addressable_memory_unit_size.  The default is
+   based on the bits_per_byte defined in the bfd library for the current
+   architecture, this is usually 8-bits, and so this function will usually
+   return 1 indicating 1 byte is 1 octet.  */
 
 int
 default_addressable_memory_unit_size (struct gdbarch *gdbarch)
 {
-  return 1;
+  return gdbarch_bfd_arch_info (gdbarch)->bits_per_byte / 8;
 }
 
 void