Commonise tdesc_feature and makes use of it in gdbserver tdesc

gdb/
	* common/tdesc.c (tdesc_feature::accept): Move to here.
	(tdesc_feature::operator==): Likewise.
	(tdesc_create_reg): Likewise.
	* common/tdesc.h (tdesc_type_kind): Likewise.
	(struct tdesc_type): Likewise.
	(struct tdesc_feature): Likewise.
	* regformats/regdat.sh: Create a feature.
	* target-descriptions.c (tdesc_type_kind): Move from here.
	(tdesc_type): Likewise.
	(tdesc_type_up): Likewise.
	(tdesc_feature): Likewise.
	(tdesc_create_reg): Likewise.

gdbserver/
	* tdesc.c (~target_desc): Remove implictly deleted items.
	(init_target_desc): Iterate all features.
	(tdesc_get_features_xml): Use vector.
	(tdesc_create_feature): Create feature.
	* tdesc.h (tdesc_feature) Remove
	(target_desc): Add features.

2 files changed, 151 insertions, 0 deletions

diff --git a/gdb/common/tdesc.c b/gdb/common/tdesc.c
index 8a3d620..eefb201 100644
--- a/gdb/common/tdesc.c
+++ b/gdb/common/tdesc.c
@@ -33,3 +33,61 @@ tdesc_reg::tdesc_reg (struct tdesc_feature *feature, const std::string &name_,
      have easy access to the containing feature when we want it later.  */
   tdesc_type = tdesc_named_type (feature, type.c_str ());
 }
+
+void tdesc_feature::accept (tdesc_element_visitor &v) const
+{
+  v.visit_pre (this);
+
+  for (const tdesc_type_up &type : types)
+    type->accept (v);
+
+  for (const tdesc_reg_up &reg : registers)
+    reg->accept (v);
+
+  v.visit_post (this);
+}
+
+bool tdesc_feature::operator== (const tdesc_feature &other) const
+{
+  if (name != other.name)
+    return false;
+
+  if (registers.size () != other.registers.size ())
+    return false;
+
+  for (int ix = 0; ix < registers.size (); ix++)
+    {
+      const tdesc_reg_up &reg1 = registers[ix];
+      const tdesc_reg_up &reg2 = other.registers[ix];
+
+      if (reg1 != reg2 && *reg1 != *reg2)
+	return false;
+      }
+
+  if (types.size () != other.types.size ())
+    return false;
+
+  for (int ix = 0; ix < types.size (); ix++)
+    {
+      const tdesc_type_up &type1 = types[ix];
+      const tdesc_type_up &type2 = other.types[ix];
+
+      if (type1 != type2 && *type1 != *type2)
+	return false;
+    }
+
+  return true;
+}
+
+/* See common/tdesc.h.  */
+
+void
+tdesc_create_reg (struct tdesc_feature *feature, const char *name,
+		  int regnum, int save_restore, const char *group,
+		  int bitsize, const char *type)
+{
+  tdesc_reg *reg = new tdesc_reg (feature, name, regnum, save_restore,
+				  group, bitsize, type);
+
+  feature->registers.emplace_back (reg);
+}
diff --git a/gdb/common/tdesc.h b/gdb/common/tdesc.h
index 0ec45af..b501dfa 100644
--- a/gdb/common/tdesc.h
+++ b/gdb/common/tdesc.h
@@ -131,6 +131,99 @@ struct tdesc_reg : tdesc_element
 
 typedef std::unique_ptr<tdesc_reg> tdesc_reg_up;
 
+enum tdesc_type_kind
+{
+  /* Predefined types.  */
+  TDESC_TYPE_BOOL,
+  TDESC_TYPE_INT8,
+  TDESC_TYPE_INT16,
+  TDESC_TYPE_INT32,
+  TDESC_TYPE_INT64,
+  TDESC_TYPE_INT128,
+  TDESC_TYPE_UINT8,
+  TDESC_TYPE_UINT16,
+  TDESC_TYPE_UINT32,
+  TDESC_TYPE_UINT64,
+  TDESC_TYPE_UINT128,
+  TDESC_TYPE_CODE_PTR,
+  TDESC_TYPE_DATA_PTR,
+  TDESC_TYPE_IEEE_SINGLE,
+  TDESC_TYPE_IEEE_DOUBLE,
+  TDESC_TYPE_ARM_FPA_EXT,
+  TDESC_TYPE_I387_EXT,
+
+  /* Types defined by a target feature.  */
+  TDESC_TYPE_VECTOR,
+  TDESC_TYPE_STRUCT,
+  TDESC_TYPE_UNION,
+  TDESC_TYPE_FLAGS,
+  TDESC_TYPE_ENUM
+};
+
+struct tdesc_type : tdesc_element
+{
+  tdesc_type (const std::string &name_, enum tdesc_type_kind kind_)
+    : name (name_), kind (kind_)
+  {}
+
+  virtual ~tdesc_type () = default;
+
+  DISABLE_COPY_AND_ASSIGN (tdesc_type);
+
+  /* The name of this type.  */
+  std::string name;
+
+  /* Identify the kind of this type.  */
+  enum tdesc_type_kind kind;
+
+  bool operator== (const tdesc_type &other) const
+  {
+    return name == other.name && kind == other.kind;
+  }
+
+  bool operator!= (const tdesc_type &other) const
+  {
+    return !(*this == other);
+  }
+};
+
+typedef std::unique_ptr<tdesc_type> tdesc_type_up;
+
+/* A feature from a target description.  Each feature is a collection
+   of other elements, e.g. registers and types.  */
+
+struct tdesc_feature : tdesc_element
+{
+  tdesc_feature (const std::string &name_)
+    : name (name_)
+  {}
+
+  virtual ~tdesc_feature () = default;
+
+  DISABLE_COPY_AND_ASSIGN (tdesc_feature);
+
+  /* The name of this feature.  It may be recognized by the architecture
+     support code.  */
+  std::string name;
+
+  /* The registers associated with this feature.  */
+  std::vector<tdesc_reg_up> registers;
+
+  /* The types associated with this feature.  */
+  std::vector<tdesc_type_up> types;
+
+  void accept (tdesc_element_visitor &v) const override;
+
+  bool operator== (const tdesc_feature &other) const;
+
+  bool operator!= (const tdesc_feature &other) const
+  {
+    return !(*this == other);
+  }
+};
+
+typedef std::unique_ptr<tdesc_feature> tdesc_feature_up;
+
 /* Allocate a new target_desc.  */
 target_desc *allocate_target_description (void);