gdb: add accessors for field (and call site) location

Add accessors for the various location values in struct field.  This
lets us assert that when we get a location value of a certain kind (say,
bitpos), the field's location indeed contains a value of that kind.

Remove the SET_FIELD_* macros, instead use the new setters directly.
Update the FIELD_* macros used to access field locations to go through
the getters.  They will be removed in a subsequent patch.

There are places where the FIELD_* macros are used on call_site_target
structures, because it contains members of the same name (loc_kind and
loc).  For now, I have replicated the getters/setters in
call_site_target.  But we could perhaps eventually factor them in a
"location" structure that can be used at both places.

Note that the field structure, being zero-initialized, defaults to a
bitpos location with value 0.  While writing this patch, I tried to make
it default to an "unset" location, to catch places where we would miss
setting a field's location.  However, I found that some places relied on
the default being "bitpos 0", so I left it as-is.  This change could
always be done as follow-up work, making these places explicitly set the
"bitpos 0" location.

I found two issues to fix:

 - I got some failures in the gdb.base/infcall-nested-structs-c++.exp
   test.  They were caused by two functions in amd64-tdep.c using
   TYPE_FIELD_BITPOS before checking if the location is of the bitpos
   kind, which they do indirectly through `field_is_static`.  Simply
   move getting the bitpos below the field_is_static call.

 - I got a failure in gdb.xml/tdesc-regs.exp.  It turns out that in
   make_gdb_type_enum, we set enum field values using SET_FIELD_BITPOS,
   and later access them through FIELD_ENUMVAL.  Fix that by using
   set_loc_enumval to set the value.

Change-Id: I53d3734916c46457576ba11dd77df4049d2fc1e8

14 files changed, 189 insertions, 105 deletions

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 6a19ad9..98718bc 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -7503,7 +7503,7 @@ ada_template_to_fixed_record_type_1 (struct type *type,
     {
       off = align_up (off, field_alignment (type, f))
 	+ TYPE_FIELD_BITPOS (type, f);
-      SET_FIELD_BITPOS (rtype->field (f), off);
+      rtype->field (f).set_loc_bitpos (off);
       TYPE_FIELD_BITSIZE (rtype, f) = 0;
 
       if (ada_is_variant_part (type, f))
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 129f07e..4776120 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -553,7 +553,6 @@ amd64_has_unaligned_fields (struct type *type)
       for (int i = 0; i < type->num_fields (); i++)
 	{
 	  struct type *subtype = check_typedef (type->field (i).type ());
-	  int bitpos = TYPE_FIELD_BITPOS (type, i);
 
 	  /* Ignore static fields, empty fields (for example nested
 	     empty structures), and bitfields (these are handled by
@@ -564,6 +563,8 @@ amd64_has_unaligned_fields (struct type *type)
 	      || TYPE_FIELD_PACKED (type, i))
 	    continue;
 
+	  int bitpos = TYPE_FIELD_BITPOS (type, i);
+
 	  if (bitpos % 8 != 0)
 	    return true;
 
@@ -592,21 +593,21 @@ amd64_classify_aggregate_field (struct type *type, int i,
 				unsigned int bitoffset)
 {
   struct type *subtype = check_typedef (type->field (i).type ());
-  int bitpos = bitoffset + TYPE_FIELD_BITPOS (type, i);
-  int pos = bitpos / 64;
   enum amd64_reg_class subclass[2];
   int bitsize = TYPE_FIELD_BITSIZE (type, i);
-  int endpos;
 
   if (bitsize == 0)
     bitsize = TYPE_LENGTH (subtype) * 8;
-  endpos = (bitpos + bitsize - 1) / 64;
 
   /* Ignore static fields, or empty fields, for example nested
      empty structures.*/
   if (field_is_static (&type->field (i)) || bitsize == 0)
     return;
 
+  int bitpos = bitoffset + TYPE_FIELD_BITPOS (type, i);
+  int pos = bitpos / 64;
+  int endpos = (bitpos + bitsize - 1) / 64;
+
   if (subtype->code () == TYPE_CODE_STRUCT
       || subtype->code () == TYPE_CODE_UNION)
     {
diff --git a/gdb/coffread.c b/gdb/coffread.c
index 30cf819..225e0e2 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -2012,7 +2012,7 @@ coff_read_struct_type (int index, int length, int lastsym,
 						name));
 	  list->field.set_type (decode_type (ms, ms->c_type, &sub_aux,
 					     objfile));
-	  SET_FIELD_BITPOS (list->field, 8 * ms->c_value);
+	  list->field.set_loc_bitpos (8 * ms->c_value);
 	  FIELD_BITSIZE (list->field) = 0;
 	  nfields++;
 	  break;
@@ -2029,7 +2029,7 @@ coff_read_struct_type (int index, int length, int lastsym,
 						name));
 	  list->field.set_type (decode_type (ms, ms->c_type, &sub_aux,
 					     objfile));
-	  SET_FIELD_BITPOS (list->field, ms->c_value);
+	  list->field.set_loc_bitpos (ms->c_value);
 	  FIELD_BITSIZE (list->field) = sub_aux.x_sym.x_misc.x_lnsz.x_size;
 	  nfields++;
 	  break;
@@ -2145,7 +2145,7 @@ coff_read_enum_type (int index, int length, int lastsym,
 
 	  SYMBOL_TYPE (xsym) = type;
 	  type->field (n).set_name (xsym->linkage_name ());
-	  SET_FIELD_ENUMVAL (type->field (n), SYMBOL_VALUE (xsym));
+	  type->field (n).set_loc_enumval (SYMBOL_VALUE (xsym));
 	  if (SYMBOL_VALUE (xsym) < 0)
 	    unsigned_enum = 0;
 	  TYPE_FIELD_BITSIZE (type, n) = 0;
diff --git a/gdb/cp-valprint.c b/gdb/cp-valprint.c
index f6969a5..ef7276a 100644
--- a/gdb/cp-valprint.c
+++ b/gdb/cp-valprint.c
@@ -735,13 +735,13 @@ test_print_fields (gdbarch *arch)
   if (gdbarch_byte_order (arch) == BFD_ENDIAN_LITTLE)
     {
       f = append_composite_type_field_raw (the_struct, "A", bool_type);
-      SET_FIELD_BITPOS (*f, 1);
+      f->set_loc_bitpos (1);
       FIELD_BITSIZE (*f) = 1;
       f = append_composite_type_field_raw (the_struct, "B", uint8_type);
-      SET_FIELD_BITPOS (*f, 3);
+      f->set_loc_bitpos (3);
       FIELD_BITSIZE (*f) = 3;
       f = append_composite_type_field_raw (the_struct, "C", bool_type);
-      SET_FIELD_BITPOS (*f, 7);
+      f->set_loc_bitpos (7);
       FIELD_BITSIZE (*f) = 1;
     }
   /* According to the logic commented in "make_gdb_type_struct ()" of
@@ -750,13 +750,13 @@ test_print_fields (gdbarch *arch)
   else
     {
       f = append_composite_type_field_raw (the_struct, "A", bool_type);
-      SET_FIELD_BITPOS (*f, 30);
+      f->set_loc_bitpos (30);
       FIELD_BITSIZE (*f) = 1;
       f = append_composite_type_field_raw (the_struct, "B", uint8_type);
-      SET_FIELD_BITPOS (*f, 26);
+      f->set_loc_bitpos (26);
       FIELD_BITSIZE (*f) = 3;
       f = append_composite_type_field_raw (the_struct, "C", bool_type);
-      SET_FIELD_BITPOS (*f, 24);
+      f->set_loc_bitpos (24);
       FIELD_BITSIZE (*f) = 1;
     }
 
diff --git a/gdb/ctfread.c b/gdb/ctfread.c
index 3d2cb11..712683b 100644
--- a/gdb/ctfread.c
+++ b/gdb/ctfread.c
@@ -418,7 +418,7 @@ ctf_add_member_cb (const char *name,
     process_struct_members (ccp, tid, t);
 
   fp->set_type (t);
-  SET_FIELD_BITPOS (*fp, offset / TARGET_CHAR_BIT);
+  fp->set_loc_bitpos (offset / TARGET_CHAR_BIT);
   FIELD_BITSIZE (*fp) = get_bitsize (ccp->fp, tid, kind);
 
   fip->fields.emplace_back (new_field);
@@ -440,7 +440,7 @@ ctf_add_enum_member_cb (const char *name, int enum_value, void *arg)
   fp = &new_field.field;
   fp->set_name (name);
   fp->set_type (nullptr);
-  SET_FIELD_ENUMVAL (*fp, enum_value);
+  fp->set_loc_enumval (enum_value);
   FIELD_BITSIZE (*fp) = 0;
 
   if (name != nullptr)
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 5d48e4c..cbd9a30 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -9093,7 +9093,7 @@ quirk_rust_enum (struct type *type, struct objfile *objfile)
       type->field (0).set_type (field_type);
       TYPE_FIELD_ARTIFICIAL (type, 0) = 1;
       type->field (0).set_name ("<<discriminant>>");
-      SET_FIELD_BITPOS (type->field (0), bit_offset);
+      type->field (0).set_loc_bitpos (bit_offset);
 
       /* The order of fields doesn't really matter, so put the real
 	 field at index 1 and the data-less field at index 2.  */
@@ -9113,7 +9113,7 @@ quirk_rust_enum (struct type *type, struct objfile *objfile)
       /* NAME points into the original discriminant name, which
 	 already has the correct lifetime.  */
       type->field (2).set_name (name);
-      SET_FIELD_BITPOS (type->field (2), 0);
+      type->field (2).set_loc_bitpos (0);
 
       /* Indicate that this is a variant type.  */
       static discriminant_range ranges[1] = { { 0, 0 } };
@@ -13469,7 +13469,8 @@ read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
       /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin.  */
       attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
     }
-  SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
+
+  call_site->target.set_loc_dwarf_block (nullptr);
   if (!attr || (attr->form_is_block () && attr->as_block ()->size == 0))
     /* Keep NULL DWARF_BLOCK.  */;
   else if (attr->form_is_block ())
@@ -13483,7 +13484,7 @@ read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
       dlbaton->per_objfile = per_objfile;
       dlbaton->per_cu = cu->per_cu;
 
-      SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
+      call_site->target.set_loc_dwarf_block (dlbaton);
     }
   else if (attr->form_is_ref ())
     {
@@ -13505,7 +13506,7 @@ read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
 			 "physname, for referencing DIE %s [in module %s]"),
 		       sect_offset_str (die->sect_off), objfile_name (objfile));
 	  else
-	    SET_FIELD_PHYSNAME (call_site->target, target_physname);
+	    call_site->target.set_loc_physname (target_physname);
 	}
       else
 	{
@@ -13521,7 +13522,7 @@ read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
 	    {
 	      lowpc = (gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr)
 		       - baseaddr);
-	      SET_FIELD_PHYSADDR (call_site->target, lowpc);
+	      call_site->target.set_loc_physaddr (lowpc);
 	    }
 	}
     }
@@ -14483,7 +14484,7 @@ handle_member_location (struct die_info *die, struct dwarf2_cu *cu,
       if (attr->form_is_constant ())
 	{
 	  LONGEST offset = attr->constant_value (0);
-	  SET_FIELD_BITPOS (*field, offset * bits_per_byte);
+	  field->set_loc_bitpos (offset * bits_per_byte);
 	}
       else if (attr->form_is_section_offset ())
 	dwarf2_complex_location_expr_complaint ();
@@ -14492,7 +14493,7 @@ handle_member_location (struct die_info *die, struct dwarf2_cu *cu,
 	  bool handled;
 	  CORE_ADDR offset = decode_locdesc (attr->as_block (), cu, &handled);
 	  if (handled)
-	    SET_FIELD_BITPOS (*field, offset * bits_per_byte);
+	    field->set_loc_bitpos (offset * bits_per_byte);
 	  else
 	    {
 	      dwarf2_per_objfile *per_objfile = cu->per_objfile;
@@ -14509,7 +14510,7 @@ handle_member_location (struct die_info *die, struct dwarf2_cu *cu,
 	      dlbaton->per_objfile = per_objfile;
 	      dlbaton->per_cu = cu->per_cu;
 
-	      SET_FIELD_DWARF_BLOCK (*field, dlbaton);
+	      field->set_loc_dwarf_block (dlbaton);
 	    }
 	}
       else
@@ -14519,7 +14520,7 @@ handle_member_location (struct die_info *die, struct dwarf2_cu *cu,
     {
       attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
       if (attr != nullptr)
-	SET_FIELD_BITPOS (*field, attr->constant_value (0));
+	field->set_loc_bitpos (attr->constant_value (0));
     }
 }
 
@@ -14568,7 +14569,7 @@ dwarf2_add_field (struct field_info *fip, struct die_info *die,
       /* Get type of field.  */
       fp->set_type (die_type (die, cu));
 
-      SET_FIELD_BITPOS (*fp, 0);
+      fp->set_loc_bitpos (0);
 
       /* Get bit size of field (zero if none).  */
       attr = dwarf2_attr (die, DW_AT_bit_size, cu);
@@ -14593,8 +14594,7 @@ dwarf2_add_field (struct field_info *fip, struct die_info *die,
 		 anonymous object to the MSB of the field.  We don't
 		 have to do anything special since we don't need to
 		 know the size of the anonymous object.  */
-	      SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
-				      + attr->constant_value (0)));
+	      fp->set_loc_bitpos ((FIELD_BITPOS (*fp) + attr->constant_value (0)));
 	    }
 	  else
 	    {
@@ -14623,10 +14623,9 @@ dwarf2_add_field (struct field_info *fip, struct die_info *die,
 		     bit field.  */
 		  anonymous_size = TYPE_LENGTH (fp->type ());
 		}
-	      SET_FIELD_BITPOS (*fp,
-				(FIELD_BITPOS (*fp)
-				 + anonymous_size * bits_per_byte
-				 - bit_offset - FIELD_BITSIZE (*fp)));
+	      fp->set_loc_bitpos (FIELD_BITPOS (*fp)
+			      + anonymous_size * bits_per_byte
+			      - bit_offset - FIELD_BITSIZE (*fp));
 	    }
 	}
 
@@ -14682,7 +14681,7 @@ dwarf2_add_field (struct field_info *fip, struct die_info *die,
 
       /* The name is already allocated along with this objfile, so we don't
 	 need to duplicate it for the type.  */
-      SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
+      fp->set_loc_physname (physname ? physname : "");
       fp->set_type (die_type (die, cu));
       fp->set_name (fieldname);
     }
@@ -16142,7 +16141,7 @@ update_enumeration_type_from_children (struct die_info *die,
       fields.emplace_back ();
       struct field &field = fields.back ();
       field.set_name (dwarf2_physname (name, child_die, cu));
-      SET_FIELD_ENUMVAL (field, value);
+      field.set_loc_enumval (value);
     }
 
   if (!fields.empty ())
@@ -16416,7 +16415,7 @@ recognize_bound_expression (struct die_info *die, enum dwarf_attribute name,
   else
     return false;
 
-  SET_FIELD_BITPOS (*field, 8 * offset);
+  field->set_loc_bitpos (8 * offset);
   if (size != TYPE_LENGTH (field->type ()))
     FIELD_BITSIZE (*field) = 8 * size;
 
@@ -16564,7 +16563,7 @@ quirk_ada_thick_pointer (struct die_info *die, struct dwarf2_cu *cu,
 
   result->field (1).set_name ("P_BOUNDS");
   result->field (1).set_type (lookup_pointer_type (bounds));
-  SET_FIELD_BITPOS (result->field (1), 8 * bounds_offset);
+  result->field (1).set_loc_bitpos (8 * bounds_offset);
 
   result->set_name (type->name ());
   TYPE_LENGTH (result) = (TYPE_LENGTH (result->field (0).type ())
diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index 913a877..de73a2b 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -2599,8 +2599,8 @@ resolve_dynamic_struct (struct type *type,
 	  CORE_ADDR addr;
 	  if (dwarf2_evaluate_property (&prop, nullptr, addr_stack, &addr,
 					true))
-	    SET_FIELD_BITPOS (resolved_type->field (i),
-			      TARGET_CHAR_BIT * (addr - addr_stack->addr));
+	    resolved_type->field (i).set_loc_bitpos
+	      (TARGET_CHAR_BIT * (addr - addr_stack->addr));
 	}
 
       /* As we know this field is not a static field, the field's
@@ -5561,25 +5561,22 @@ copy_type_recursive (struct objfile *objfile,
 	  switch (TYPE_FIELD_LOC_KIND (type, i))
 	    {
 	    case FIELD_LOC_KIND_BITPOS:
-	      SET_FIELD_BITPOS (new_type->field (i),
-				TYPE_FIELD_BITPOS (type, i));
+	      new_type->field (i).set_loc_bitpos (TYPE_FIELD_BITPOS (type, i));
 	      break;
 	    case FIELD_LOC_KIND_ENUMVAL:
-	      SET_FIELD_ENUMVAL (new_type->field (i),
-				 TYPE_FIELD_ENUMVAL (type, i));
+	      new_type->field (i).set_loc_enumval (TYPE_FIELD_ENUMVAL (type, i));
 	      break;
 	    case FIELD_LOC_KIND_PHYSADDR:
-	      SET_FIELD_PHYSADDR (new_type->field (i),
-				  TYPE_FIELD_STATIC_PHYSADDR (type, i));
+	      new_type->field (i).set_loc_physaddr
+		(TYPE_FIELD_STATIC_PHYSADDR (type, i));
 	      break;
 	    case FIELD_LOC_KIND_PHYSNAME:
-	      SET_FIELD_PHYSNAME (new_type->field (i),
-				  xstrdup (TYPE_FIELD_STATIC_PHYSNAME (type,
-								       i)));
+	      new_type->field (i).set_loc_physname
+		(xstrdup (TYPE_FIELD_STATIC_PHYSNAME (type, i)));
 	      break;
             case FIELD_LOC_KIND_DWARF_BLOCK:
-              SET_FIELD_DWARF_BLOCK (new_type->field (i),
-                                     TYPE_FIELD_DWARF_BLOCK (type, i));
+              new_type->field (i).set_loc_dwarf_block
+		(TYPE_FIELD_DWARF_BLOCK (type, i));
               break;
 	    default:
 	      internal_error (__FILE__, __LINE__,
@@ -5846,7 +5843,7 @@ append_flags_type_field (struct type *type, int start_bitpos, int nr_bits,
 
   type->field (field_nr).set_name (xstrdup (name));
   type->field (field_nr).set_type (field_type);
-  SET_FIELD_BITPOS (type->field (field_nr), start_bitpos);
+  type->field (field_nr).set_loc_bitpos (start_bitpos);
   TYPE_FIELD_BITSIZE (type, field_nr) = nr_bits;
   type->set_num_fields (type->num_fields () + 1);
 }
@@ -5918,10 +5915,8 @@ append_composite_type_field_aligned (struct type *t, const char *name,
       TYPE_LENGTH (t) = TYPE_LENGTH (t) + TYPE_LENGTH (field);
       if (t->num_fields () > 1)
 	{
-	  SET_FIELD_BITPOS (f[0],
-			    (FIELD_BITPOS (f[-1])
-			     + (TYPE_LENGTH (f[-1].type ())
-				* TARGET_CHAR_BIT)));
+	  f->set_loc_bitpos
+	    ((FIELD_BITPOS (f[-1]) + (TYPE_LENGTH (f[-1].type ()) * TARGET_CHAR_BIT)));
 
 	  if (alignment)
 	    {
@@ -5932,7 +5927,7 @@ append_composite_type_field_aligned (struct type *t, const char *name,
 
 	      if (left)
 		{
-		  SET_FIELD_BITPOS (f[0], FIELD_BITPOS (f[0]) + (alignment - left));
+		  f->set_loc_bitpos (FIELD_BITPOS (f[0]) + (alignment - left));
 		  TYPE_LENGTH (t) += (alignment - left) / TARGET_CHAR_BIT;
 		}
 	    }
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index 4e5b2f1..dc575c4 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -664,7 +664,74 @@ struct field
     m_name = name;
   }
 
-  union field_location loc;
+  /* Location getters / setters.  */
+
+  field_loc_kind loc_kind () const
+  {
+    return m_loc_kind;
+  }
+
+  LONGEST loc_bitpos () const
+  {
+    gdb_assert (m_loc_kind == FIELD_LOC_KIND_BITPOS);
+    return m_loc.bitpos;
+  }
+
+  void set_loc_bitpos (LONGEST bitpos)
+  {
+    m_loc_kind = FIELD_LOC_KIND_BITPOS;
+    m_loc.bitpos = bitpos;
+  }
+
+  LONGEST loc_enumval () const
+  {
+    gdb_assert (m_loc_kind == FIELD_LOC_KIND_ENUMVAL);
+    return m_loc.enumval;
+  }
+
+  void set_loc_enumval (LONGEST enumval)
+  {
+    m_loc_kind = FIELD_LOC_KIND_ENUMVAL;
+    m_loc.enumval = enumval;
+  }
+
+  CORE_ADDR loc_physaddr () const
+  {
+    gdb_assert (m_loc_kind == FIELD_LOC_KIND_PHYSADDR);
+    return m_loc.physaddr;
+  }
+
+  void set_loc_physaddr (CORE_ADDR physaddr)
+  {
+    m_loc_kind = FIELD_LOC_KIND_PHYSADDR;
+    m_loc.physaddr = physaddr;
+  }
+
+  const char *loc_physname () const
+  {
+    gdb_assert (m_loc_kind == FIELD_LOC_KIND_PHYSNAME);
+    return m_loc.physname;
+  }
+
+  void set_loc_physname (const char *physname)
+  {
+    m_loc_kind = FIELD_LOC_KIND_PHYSNAME;
+    m_loc.physname = physname;
+  }
+
+  dwarf2_locexpr_baton *loc_dwarf_block () const
+  {
+    gdb_assert (m_loc_kind == FIELD_LOC_KIND_DWARF_BLOCK);
+    return m_loc.dwarf_block;
+  }
+
+  void set_loc_dwarf_block (dwarf2_locexpr_baton *dwarf_block)
+  {
+    m_loc_kind = FIELD_LOC_KIND_DWARF_BLOCK;
+    m_loc.dwarf_block = dwarf_block;
+  }
+
+  union field_location m_loc;
 
   /* * For a function or member type, this is 1 if the argument is
      marked artificial.  Artificial arguments should not be shown
@@ -675,7 +742,7 @@ struct field
 
   /* * Discriminant for union field_location.  */
 
-  ENUM_BITFIELD(field_loc_kind) loc_kind : 3;
+  ENUM_BITFIELD(field_loc_kind) m_loc_kind : 3;
 
   /* * Size of this field, in bits, or zero if not packed.
      If non-zero in an array type, indicates the element size in
@@ -1742,11 +1809,52 @@ enum call_site_parameter_kind
 
 struct call_site_target
 {
-  union field_location loc;
+  field_loc_kind loc_kind () const
+  {
+    return m_loc_kind;
+  }
+
+  CORE_ADDR loc_physaddr () const
+  {
+    gdb_assert (m_loc_kind == FIELD_LOC_KIND_PHYSADDR);
+    return m_loc.physaddr;
+  }
+
+  void set_loc_physaddr (CORE_ADDR physaddr)
+  {
+    m_loc_kind = FIELD_LOC_KIND_PHYSADDR;
+    m_loc.physaddr = physaddr;
+  }
+
+  const char *loc_physname () const
+  {
+    gdb_assert (m_loc_kind == FIELD_LOC_KIND_PHYSNAME);
+    return m_loc.physname;
+  }
+
+  void set_loc_physname (const char *physname)
+    {
+      m_loc_kind = FIELD_LOC_KIND_PHYSNAME;
+      m_loc.physname = physname;
+    }
+
+  dwarf2_locexpr_baton *loc_dwarf_block () const
+  {
+    gdb_assert (m_loc_kind == FIELD_LOC_KIND_DWARF_BLOCK);
+    return m_loc.dwarf_block;
+  }
+
+  void set_loc_dwarf_block (dwarf2_locexpr_baton *dwarf_block)
+    {
+      m_loc_kind = FIELD_LOC_KIND_DWARF_BLOCK;
+      m_loc.dwarf_block = dwarf_block;
+    }
+
+  union field_location m_loc;
 
   /* * Discriminant for union field_location.  */
 
-  ENUM_BITFIELD(field_loc_kind) loc_kind : 3;
+  ENUM_BITFIELD(field_loc_kind) m_loc_kind : 3;
 };
 
 union call_site_parameter_u
@@ -2016,29 +2124,12 @@ extern void set_type_vptr_basetype (struct type *, struct type *);
   (TYPE_CPLUS_SPECIFIC(thistype)->virtual_field_bits == NULL ? 0 \
     : B_TST(TYPE_CPLUS_SPECIFIC(thistype)->virtual_field_bits, (index)))
 
-#define FIELD_LOC_KIND(thisfld) ((thisfld).loc_kind)
-#define FIELD_BITPOS_LVAL(thisfld) ((thisfld).loc.bitpos)
-#define FIELD_BITPOS(thisfld) (FIELD_BITPOS_LVAL (thisfld) + 0)
-#define FIELD_ENUMVAL_LVAL(thisfld) ((thisfld).loc.enumval)
-#define FIELD_ENUMVAL(thisfld) (FIELD_ENUMVAL_LVAL (thisfld) + 0)
-#define FIELD_STATIC_PHYSNAME(thisfld) ((thisfld).loc.physname)
-#define FIELD_STATIC_PHYSADDR(thisfld) ((thisfld).loc.physaddr)
-#define FIELD_DWARF_BLOCK(thisfld) ((thisfld).loc.dwarf_block)
-#define SET_FIELD_BITPOS(thisfld, bitpos)			\
-  (FIELD_LOC_KIND (thisfld) = FIELD_LOC_KIND_BITPOS,		\
-   FIELD_BITPOS_LVAL (thisfld) = (bitpos))
-#define SET_FIELD_ENUMVAL(thisfld, enumval)			\
-  (FIELD_LOC_KIND (thisfld) = FIELD_LOC_KIND_ENUMVAL,		\
-   FIELD_ENUMVAL_LVAL (thisfld) = (enumval))
-#define SET_FIELD_PHYSNAME(thisfld, name)			\
-  (FIELD_LOC_KIND (thisfld) = FIELD_LOC_KIND_PHYSNAME,		\
-   FIELD_STATIC_PHYSNAME (thisfld) = (name))
-#define SET_FIELD_PHYSADDR(thisfld, addr)			\
-  (FIELD_LOC_KIND (thisfld) = FIELD_LOC_KIND_PHYSADDR,		\
-   FIELD_STATIC_PHYSADDR (thisfld) = (addr))
-#define SET_FIELD_DWARF_BLOCK(thisfld, addr)			\
-  (FIELD_LOC_KIND (thisfld) = FIELD_LOC_KIND_DWARF_BLOCK,	\
-   FIELD_DWARF_BLOCK (thisfld) = (addr))
+#define FIELD_LOC_KIND(thisfld) ((thisfld).loc_kind ())
+#define FIELD_BITPOS(thisfld) ((thisfld).loc_bitpos ())
+#define FIELD_ENUMVAL(thisfld) ((thisfld).loc_enumval ())
+#define FIELD_STATIC_PHYSNAME(thisfld) ((thisfld).loc_physname ())
+#define FIELD_STATIC_PHYSADDR(thisfld) ((thisfld).loc_physaddr ())
+#define FIELD_DWARF_BLOCK(thisfld) ((thisfld).loc_dwarf_block ())
 #define FIELD_ARTIFICIAL(thisfld) ((thisfld).artificial)
 #define FIELD_BITSIZE(thisfld) ((thisfld).bitsize)
 
diff --git a/gdb/gnu-v3-abi.c b/gdb/gnu-v3-abi.c
index 748d555..b82ac59 100644
--- a/gdb/gnu-v3-abi.c
+++ b/gdb/gnu-v3-abi.c
@@ -137,28 +137,28 @@ build_gdb_vtable_type (struct gdbarch *arch)
   /* ptrdiff_t vcall_and_vbase_offsets[0]; */
   field->set_name ("vcall_and_vbase_offsets");
   field->set_type (lookup_array_range_type (ptrdiff_type, 0, -1));
-  SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
+  field->set_loc_bitpos (offset * TARGET_CHAR_BIT);
   offset += TYPE_LENGTH (field->type ());
   field++;
 
   /* ptrdiff_t offset_to_top; */
   field->set_name ("offset_to_top");
   field->set_type (ptrdiff_type);
-  SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
+  field->set_loc_bitpos (offset * TARGET_CHAR_BIT);
   offset += TYPE_LENGTH (field->type ());
   field++;
 
   /* void *type_info; */
   field->set_name ("type_info");
   field->set_type (void_ptr_type);
-  SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
+  field->set_loc_bitpos (offset * TARGET_CHAR_BIT);
   offset += TYPE_LENGTH (field->type ());
   field++;
 
   /* void (*virtual_functions[0]) (); */
   field->set_name ("virtual_functions");
   field->set_type (lookup_array_range_type (ptr_to_void_fn_type, 0, -1));
-  SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
+  field->set_loc_bitpos (offset * TARGET_CHAR_BIT);
   offset += TYPE_LENGTH (field->type ());
   field++;
 
@@ -1035,14 +1035,14 @@ build_std_type_info_type (struct gdbarch *arch)
   /* The vtable.  */
   field->set_name ("_vptr.type_info");
   field->set_type (void_ptr_type);
-  SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
+  field->set_loc_bitpos (offset * TARGET_CHAR_BIT);
   offset += TYPE_LENGTH (field->type ());
   field++;
 
   /* The name.  */
   field->set_name ("__name");
   field->set_type (char_ptr_type);
-  SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT);
+  field->set_loc_bitpos (offset * TARGET_CHAR_BIT);
   offset += TYPE_LENGTH (field->type ());
   field++;
 
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index 3e560ae..0faff5f 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -1056,7 +1056,7 @@ parse_symbol (SYMR *sh, union aux_ext *ax, char *ext_sh, int bigend,
 		if (tsym.st != stMember)
 		  break;
 
-		SET_FIELD_ENUMVAL (*f, tsym.value);
+		f->set_loc_enumval (tsym.value);
 		f->set_type (t);
 		f->set_name (debug_info->ss + cur_fdr->issBase + tsym.iss);
 		FIELD_BITSIZE (*f) = 0;
@@ -1242,7 +1242,7 @@ parse_symbol (SYMR *sh, union aux_ext *ax, char *ext_sh, int bigend,
 	struct field *f = &top_stack->cur_type->field (top_stack->cur_field);
 	top_stack->cur_field++;
 	f->set_name (name);
-	SET_FIELD_BITPOS (*f, sh->value);
+	f->set_loc_bitpos (sh->value);
 	bitsize = 0;
 	f->set_type (parse_type (cur_fd, ax, sh->index, &bitsize, bigend,
 				 name));
diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index 79284be..3c6a358 100644
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -912,7 +912,7 @@ rust_composite_type (struct type *original,
     {
       struct field *field = &result->field (i);
 
-      SET_FIELD_BITPOS (*field, bitpos);
+      field->set_loc_bitpos (bitpos);
       bitpos += TYPE_LENGTH (type1) * TARGET_CHAR_BIT;
 
       field->set_name (field1);
@@ -933,7 +933,7 @@ rust_composite_type (struct type *original,
 	  if (delta != 0)
 	    bitpos += align - delta;
 	}
-      SET_FIELD_BITPOS (*field, bitpos);
+      field->set_loc_bitpos (bitpos);
 
       field->set_name (field2);
       field->set_type (type2);
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index f63b372..64734b7 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -2755,8 +2755,7 @@ read_cpp_abbrev (struct stab_field_info *fip, const char **pp,
       {
 	int nbits;
 
-	SET_FIELD_BITPOS (fip->list->field,
-			  read_huge_number (pp, ';', &nbits, 0));
+	fip->list->field.set_loc_bitpos (read_huge_number (pp, ';', &nbits, 0));
 	if (nbits != 0)
 	  return 0;
       }
@@ -2817,7 +2816,7 @@ read_one_struct_field (struct stab_field_info *fip, const char **pp,
 	  p++;
 	}
       /* Static class member.  */
-      SET_FIELD_PHYSNAME (fip->list->field, savestring (*pp, p - *pp));
+      fip->list->field.set_loc_physname (savestring (*pp, p - *pp));
       *pp = p + 1;
       return;
     }
@@ -2833,8 +2832,7 @@ read_one_struct_field (struct stab_field_info *fip, const char **pp,
   {
     int nbits;
 
-    SET_FIELD_BITPOS (fip->list->field,
-		      read_huge_number (pp, ',', &nbits, 0));
+    fip->list->field.set_loc_bitpos (read_huge_number (pp, ',', &nbits, 0));
     if (nbits != 0)
       {
 	stabs_general_complaint ("bad structure-type format");
@@ -3110,7 +3108,7 @@ read_baseclasses (struct stab_field_info *fip, const char **pp,
 	   corresponding to this baseclass.  Always zero in the absence of
 	   multiple inheritance.  */
 
-	SET_FIELD_BITPOS (newobj->field, read_huge_number (pp, ',', &nbits, 0));
+	newobj->field.set_loc_bitpos (read_huge_number (pp, ',', &nbits, 0));
 	if (nbits != 0)
 	  return 0;
       }
@@ -3639,7 +3637,7 @@ read_enum_type (const char **pp, struct type *type,
 
 	  SYMBOL_TYPE (xsym) = type;
 	  type->field (n).set_name (xsym->linkage_name ());
-	  SET_FIELD_ENUMVAL (type->field (n), SYMBOL_VALUE (xsym));
+	  type->field (n).set_loc_enumval (SYMBOL_VALUE (xsym));
 	  TYPE_FIELD_BITSIZE (type, n) = 0;
 	}
       if (syms == osyms)
diff --git a/gdb/target-descriptions.c b/gdb/target-descriptions.c
index f5ec617..4587eca 100644
--- a/gdb/target-descriptions.c
+++ b/gdb/target-descriptions.c
@@ -230,9 +230,9 @@ make_gdb_type (struct gdbarch *gdbarch, struct tdesc_type *ttype)
 	      bitsize = f.end - f.start + 1;
 	      total_size = e->size * TARGET_CHAR_BIT;
 	      if (gdbarch_byte_order (m_gdbarch) == BFD_ENDIAN_BIG)
-		SET_FIELD_BITPOS (fld[0], total_size - f.start - bitsize);
+		fld->set_loc_bitpos (total_size - f.start - bitsize);
 	      else
-		SET_FIELD_BITPOS (fld[0], f.start);
+		fld->set_loc_bitpos (f.start);
 	      FIELD_BITSIZE (fld[0]) = bitsize;
 	    }
 	  else
@@ -298,7 +298,7 @@ make_gdb_type (struct gdbarch *gdbarch, struct tdesc_type *ttype)
 					       xstrdup (f.name.c_str ()),
 					       NULL);
 
-	  SET_FIELD_BITPOS (fld[0], f.start);
+	  fld->set_loc_enumval (f.start);
 	}
     }
 
diff --git a/gdb/windows-tdep.c b/gdb/windows-tdep.c
index c79d5e2..f6005a3 100644
--- a/gdb/windows-tdep.c
+++ b/gdb/windows-tdep.c
@@ -762,7 +762,7 @@ create_enum (struct gdbarch *gdbarch, int bit, const char *name,
   for (i = 0; i < count; i++)
     {
       type->field (i).set_name (values[i].name);
-      SET_FIELD_ENUMVAL (type->field (i), values[i].value);
+      type->field (i).set_loc_enumval (values[i].value);
     }
 
   return type;