Patchwork Use visitors for make_gdb_type

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Submitter Alan Hayward
Date Jan. 30, 2018, 3:15 p.m.
Message ID <0D465C5F-EA4D-4A6C-94C7-9EE3377CAE7E@arm.com>
Download mbox | patch
Permalink /patch/25691/
State New
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Comments

Alan Hayward - Jan. 30, 2018, 3:15 p.m.
> On 29 Jan 2018, at 16:54, Yao Qi <qiyaoltc@gmail.com> wrote:

> 

> On Mon, Jan 29, 2018 at 4:12 PM, Simon Marchi <simon.marchi@ericsson.com> wrote:

>> 

>> That seems like unnecessary boilerplate to me.  I really don't see why classes derived

>> from tdesc_element_visitor have to implement methods for nodes they don't care about.

>> 

>> I added Yao in CC so he can chime in.

> 

> When I wrote tdesc_element_visitor, in my mind, it is an interface, so

> I expect child

> class implement all the methods, because at that moment, all methods are needed,

> no empty methods.  However, the situation changed a little bit, as per

> Alan's needs,

> part of the methods of tdesc_element_visitor are needed, and the rest of methods

> are empty somewhere.  I don't mind converting tdesc_element_visitor into a base

> class which has all these methods empty as a default.  That is fine to

> me.  By the

> way, Alan's approach is fine to me as well :)

> 


I’ve removed the extra class and replaced with default implementations in
tdesc_element_visitor.

All ok?


Tested on a make check on x86 targets=all build with target board unix native-gdbserver.
Built for power (because it does not use new target descriptions), but am unable to test.

2018-01-30  Alan Hayward  <alan.hayward@arm.com>

	* target-descriptions.c (tdesc_element_visitor) Add empty implementations.
	(tdesc_type): Move make_gdb_type from here.
	(tdesc_type_builtin): Likewise.
	(tdesc_type_vector): Likewise.
	(tdesc_type_with_fields): Move make_gdb_type_ functions from here.
	(make_gdb_type_struct): Move from tdesc_type_with_fields.
	(make_gdb_type_union): Likewise.
	(make_gdb_type_flags): Likewise.
	(make_gdb_type_enum): Likewise.
	(make_gdb_type): New function.
	(tdesc_register_type): Use static make_gdb_type.
Simon Marchi - Feb. 5, 2018, 4:21 p.m.
On 2018-01-30 10:15 AM, Alan Hayward wrote:
> 
> 
>> On 29 Jan 2018, at 16:54, Yao Qi <qiyaoltc@gmail.com> wrote:
>>
>> On Mon, Jan 29, 2018 at 4:12 PM, Simon Marchi <simon.marchi@ericsson.com> wrote:
>>>
>>> That seems like unnecessary boilerplate to me.  I really don't see why classes derived
>>> from tdesc_element_visitor have to implement methods for nodes they don't care about.
>>>
>>> I added Yao in CC so he can chime in.
>>
>> When I wrote tdesc_element_visitor, in my mind, it is an interface, so
>> I expect child
>> class implement all the methods, because at that moment, all methods are needed,
>> no empty methods.  However, the situation changed a little bit, as per
>> Alan's needs,
>> part of the methods of tdesc_element_visitor are needed, and the rest of methods
>> are empty somewhere.  I don't mind converting tdesc_element_visitor into a base
>> class which has all these methods empty as a default.  That is fine to
>> me.  By the
>> way, Alan's approach is fine to me as well :)
>>
> 
> I’ve removed the extra class and replaced with default implementations in
> tdesc_element_visitor.
> 
> All ok?
> 
> 
> Tested on a make check on x86 targets=all build with target board unix native-gdbserver.
> Built for power (because it does not use new target descriptions), but am unable to test.

Hi Alan,

This version LGTM.

Thanks,

Simon

Patch

diff --git a/gdb/target-descriptions.c b/gdb/target-descriptions.c

index 1b20a12d769718e591dea6df8183c2e9ecfac990..ce4cf76899cccb1c009bc556aeb6a74f0913edbe 100644

--- a/gdb/target-descriptions.c

+++ b/gdb/target-descriptions.c

@@ -38,22 +38,36 @@ 

 #include "completer.h"
 #include "readline/tilde.h" /* tilde_expand */

+static type *make_gdb_type (struct gdbarch *gdbarch, struct tdesc_type *ttype);

+

 /* The interface to visit different elements of target description.  */

 class tdesc_element_visitor
 {
 public:
-  virtual void visit_pre (const target_desc *e) = 0;

-  virtual void visit_post (const target_desc *e) = 0;

+  virtual void visit_pre (const target_desc *e)

+  {}

+

+  virtual void visit_post (const target_desc *e)

+  {}

+

+  virtual void visit_pre (const tdesc_feature *e)

+  {}

+

+  virtual void visit_post (const tdesc_feature *e)

+  {}


-  virtual void visit_pre (const tdesc_feature *e) = 0;

-  virtual void visit_post (const tdesc_feature *e) = 0;

+  virtual void visit (const tdesc_type_builtin *e)

+  {}

+

+  virtual void visit (const tdesc_type_vector *e)

+  {}


-  virtual void visit (const tdesc_type_builtin *e) = 0;

-  virtual void visit (const tdesc_type_vector *e) = 0;

-  virtual void visit (const tdesc_type_with_fields *e) = 0;

+  virtual void visit (const tdesc_type_with_fields *e)

+  {}


-  virtual void visit (const tdesc_reg *e) = 0;

+  virtual void visit (const tdesc_reg *e)

+  {}

 };

 class tdesc_element
@@ -223,11 +237,6 @@  struct tdesc_type : tdesc_element

   {
     return !(*this == other);
   }
-

-  /* Construct, if necessary, and return the GDB type implementing this

-     target type for architecture GDBARCH.  */

-

-  virtual type *make_gdb_type (struct gdbarch *gdbarch) const = 0;

 };

 typedef std::unique_ptr<tdesc_type> tdesc_type_up;
@@ -242,81 +251,6 @@  struct tdesc_type_builtin : tdesc_type

   {
     v.visit (this);
   }
-

-  type *make_gdb_type (struct gdbarch *gdbarch) const override

-  {

-    switch (this->kind)

-      {

-      /* Predefined types.  */

-      case TDESC_TYPE_BOOL:

-        return builtin_type (gdbarch)->builtin_bool;

-

-      case TDESC_TYPE_INT8:

-        return builtin_type (gdbarch)->builtin_int8;

-

-      case TDESC_TYPE_INT16:

-        return builtin_type (gdbarch)->builtin_int16;

-

-      case TDESC_TYPE_INT32:

-        return builtin_type (gdbarch)->builtin_int32;

-

-      case TDESC_TYPE_INT64:

-        return builtin_type (gdbarch)->builtin_int64;

-

-      case TDESC_TYPE_INT128:

-        return builtin_type (gdbarch)->builtin_int128;

-

-      case TDESC_TYPE_UINT8:

-        return builtin_type (gdbarch)->builtin_uint8;

-

-      case TDESC_TYPE_UINT16:

-        return builtin_type (gdbarch)->builtin_uint16;

-

-      case TDESC_TYPE_UINT32:

-        return builtin_type (gdbarch)->builtin_uint32;

-

-      case TDESC_TYPE_UINT64:

-        return builtin_type (gdbarch)->builtin_uint64;

-

-      case TDESC_TYPE_UINT128:

-        return builtin_type (gdbarch)->builtin_uint128;

-

-      case TDESC_TYPE_CODE_PTR:

-        return builtin_type (gdbarch)->builtin_func_ptr;

-

-      case TDESC_TYPE_DATA_PTR:

-        return builtin_type (gdbarch)->builtin_data_ptr;

-      }

-

-    type *gdb_type = tdesc_find_type (gdbarch, this->name.c_str ());

-    if (gdb_type != NULL)

-      return gdb_type;

-

-    switch (this->kind)

-      {

-      case TDESC_TYPE_IEEE_SINGLE:

-        return arch_float_type (gdbarch, -1, "builtin_type_ieee_single",

-				floatformats_ieee_single);

-

-      case TDESC_TYPE_IEEE_DOUBLE:

-        return arch_float_type (gdbarch, -1, "builtin_type_ieee_double",

-				floatformats_ieee_double);

-

-      case TDESC_TYPE_ARM_FPA_EXT:

-        return arch_float_type (gdbarch, -1, "builtin_type_arm_ext",

-				floatformats_arm_ext);

-

-      case TDESC_TYPE_I387_EXT:

-        return arch_float_type (gdbarch, -1, "builtin_type_i387_ext",

-				floatformats_i387_ext);

-      }

-

-    internal_error (__FILE__, __LINE__,

-		    "Type \"%s\" has an unknown kind %d",

-		    this->name.c_str (), this->kind);

-

-    return NULL;

-  }

 };

 /* tdesc_type for vector types.  */
@@ -333,19 +267,6 @@  struct tdesc_type_vector : tdesc_type

     v.visit (this);
   }

-  type *make_gdb_type (struct gdbarch *gdbarch) const override

-  {

-    type *vector_gdb_type = tdesc_find_type (gdbarch, this->name.c_str ());

-    if (vector_gdb_type != NULL)

-      return vector_gdb_type;

-

-    type *element_gdb_type = this->element_type->make_gdb_type (gdbarch);

-    vector_gdb_type = init_vector_type (element_gdb_type, this->count);

-    TYPE_NAME (vector_gdb_type) = xstrdup (this->name.c_str ());

-

-    return vector_gdb_type;

-  }

-

   struct tdesc_type *element_type;
   int count;
 };
@@ -364,151 +285,264 @@  struct tdesc_type_with_fields : tdesc_type

     v.visit (this);
   }

-  type *make_gdb_type_struct (struct gdbarch *gdbarch) const

+  std::vector<tdesc_type_field> fields;

+  int size;

+};

+

+/* Convert a tdesc_type to a gdb type.  */

+

+static type *

+make_gdb_type (struct gdbarch *gdbarch, struct tdesc_type *ttype)

+{

+  class gdb_type_creator : public tdesc_element_visitor

   {
-    type *struct_gdb_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

-    TYPE_NAME (struct_gdb_type) = xstrdup (this->name.c_str ());

-    TYPE_TAG_NAME (struct_gdb_type) = TYPE_NAME (struct_gdb_type);

+  public:

+    gdb_type_creator (struct gdbarch *gdbarch)

+      : m_gdbarch (gdbarch)

+    {}


-    for (const tdesc_type_field &f : this->fields)

-      {

-	if (f.start != -1 && f.end != -1)

-	  {

-	    /* Bitfield.  */

-	    struct field *fld;

-	    struct type *field_gdb_type;

-	    int bitsize, total_size;

-

-	    /* This invariant should be preserved while creating types.  */

-	    gdb_assert (this->size != 0);

-	    if (f.type != NULL)

-	      field_gdb_type = f.type->make_gdb_type (gdbarch);

-	    else if (this->size > 4)

-	      field_gdb_type = builtin_type (gdbarch)->builtin_uint64;

-	    else

-	      field_gdb_type = builtin_type (gdbarch)->builtin_uint32;

-

-	    fld = append_composite_type_field_raw

-	      (struct_gdb_type, xstrdup (f.name.c_str ()), field_gdb_type);

-

-	    /* For little-endian, BITPOS counts from the LSB of

-	       the structure and marks the LSB of the field.  For

-	       big-endian, BITPOS counts from the MSB of the

-	       structure and marks the MSB of the field.  Either

-	       way, it is the number of bits to the "left" of the

-	       field.  To calculate this in big-endian, we need

-	       the total size of the structure.  */

-	    bitsize = f.end - f.start + 1;

-	    total_size = this->size * TARGET_CHAR_BIT;

-	    if (gdbarch_bits_big_endian (gdbarch))

-	      SET_FIELD_BITPOS (fld[0], total_size - f.start - bitsize);

-	    else

-	      SET_FIELD_BITPOS (fld[0], f.start);

-	    FIELD_BITSIZE (fld[0]) = bitsize;

-	  }

-	else

-	  {

-	    gdb_assert (f.start == -1 && f.end == -1);

-	    type *field_gdb_type = f.type->make_gdb_type (gdbarch);

-	    append_composite_type_field (struct_gdb_type,

-					 xstrdup (f.name.c_str ()),

-					 field_gdb_type);

-	  }

-      }

+    type *get_type ()

+    {

+      return m_type;

+    }


-    if (this->size != 0)

-      TYPE_LENGTH (struct_gdb_type) = this->size;

+    void visit (const tdesc_type_builtin *e) override

+    {

+      switch (e->kind)

+	{

+	  /* Predefined types.  */

+	case TDESC_TYPE_BOOL:

+	  m_type = builtin_type (m_gdbarch)->builtin_bool;

+	  return;

+	case TDESC_TYPE_INT8:

+	  m_type = builtin_type (m_gdbarch)->builtin_int8;

+	  return;

+	case TDESC_TYPE_INT16:

+	  m_type = builtin_type (m_gdbarch)->builtin_int16;

+	  return;

+	case TDESC_TYPE_INT32:

+	  m_type = builtin_type (m_gdbarch)->builtin_int32;

+	  return;

+	case TDESC_TYPE_INT64:

+	  m_type = builtin_type (m_gdbarch)->builtin_int64;

+	  return;

+	case TDESC_TYPE_INT128:

+	  m_type = builtin_type (m_gdbarch)->builtin_int128;

+	  return;

+	case TDESC_TYPE_UINT8:

+	  m_type = builtin_type (m_gdbarch)->builtin_uint8;

+	  return;

+	case TDESC_TYPE_UINT16:

+	  m_type = builtin_type (m_gdbarch)->builtin_uint16;

+	  return;

+	case TDESC_TYPE_UINT32:

+	  m_type = builtin_type (m_gdbarch)->builtin_uint32;

+	  return;

+	case TDESC_TYPE_UINT64:

+	  m_type = builtin_type (m_gdbarch)->builtin_uint64;

+	  return;

+	case TDESC_TYPE_UINT128:

+	  m_type = builtin_type (m_gdbarch)->builtin_uint128;

+	  return;

+	case TDESC_TYPE_CODE_PTR:

+	  m_type = builtin_type (m_gdbarch)->builtin_func_ptr;

+	  return;

+	case TDESC_TYPE_DATA_PTR:

+	  m_type = builtin_type (m_gdbarch)->builtin_data_ptr;

+	  return;

+	}


-    return struct_gdb_type;

-  }

+      m_type = tdesc_find_type (m_gdbarch, e->name.c_str ());

+      if (m_type != NULL)

+	return;


-  type *make_gdb_type_union (struct gdbarch *gdbarch) const

-  {

-    type *union_gdb_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);

-    TYPE_NAME (union_gdb_type) = xstrdup (this->name.c_str ());

+      switch (e->kind)

+	{

+	case TDESC_TYPE_IEEE_SINGLE:

+	  m_type = arch_float_type (m_gdbarch, -1, "builtin_type_ieee_single",

+				    floatformats_ieee_single);

+	  return;

+

+	case TDESC_TYPE_IEEE_DOUBLE:

+	  m_type = arch_float_type (m_gdbarch, -1, "builtin_type_ieee_double",

+				    floatformats_ieee_double);

+	  return;

+	case TDESC_TYPE_ARM_FPA_EXT:

+	  m_type = arch_float_type (m_gdbarch, -1, "builtin_type_arm_ext",

+				    floatformats_arm_ext);

+	  return;

+

+	case TDESC_TYPE_I387_EXT:

+	  m_type = arch_float_type (m_gdbarch, -1, "builtin_type_i387_ext",

+				    floatformats_i387_ext);

+	  return;

+	}


-    for (const tdesc_type_field &f : this->fields)

-      {

-	type* field_gdb_type = f.type->make_gdb_type (gdbarch);

-	append_composite_type_field (union_gdb_type, xstrdup (f.name.c_str ()),

-				     field_gdb_type);

-

-	/* If any of the children of a union are vectors, flag the

-	   union as a vector also.  This allows e.g. a union of two

-	   vector types to show up automatically in "info vector".  */

-	if (TYPE_VECTOR (field_gdb_type))

-	  TYPE_VECTOR (union_gdb_type) = 1;

-      }

+      internal_error (__FILE__, __LINE__,

+		      "Type \"%s\" has an unknown kind %d",

+		      e->name.c_str (), e->kind);

+    }


-    return union_gdb_type;

-  }

+    void visit (const tdesc_type_vector *e) override

+    {

+      m_type = tdesc_find_type (m_gdbarch, e->name.c_str ());

+      if (m_type != NULL)

+	return;

+

+      type *element_gdb_type = make_gdb_type (m_gdbarch, e->element_type);

+      m_type = init_vector_type (element_gdb_type, e->count);

+      TYPE_NAME (m_type) = xstrdup (e->name.c_str ());

+      return;

+    }


-  type *make_gdb_type_flags (struct gdbarch *gdbarch) const

-  {

-    type *flags_gdb_type = arch_flags_type (gdbarch, this->name.c_str (),

-					  this->size * TARGET_CHAR_BIT);

+    void visit (const tdesc_type_with_fields *e) override

+    {

+      m_type = tdesc_find_type (m_gdbarch, e->name.c_str ());

+      if (m_type != NULL)

+	return;


-    for (const tdesc_type_field &f : this->fields)

-      {

-      int bitsize = f.end - f.start + 1;

+      switch (e->kind)

+	{

+	case TDESC_TYPE_STRUCT:

+	  make_gdb_type_struct (e);

+	  return;

+	case TDESC_TYPE_UNION:

+	  make_gdb_type_union (e);

+	  return;

+	case TDESC_TYPE_FLAGS:

+	  make_gdb_type_flags (e);

+	  return;

+	case TDESC_TYPE_ENUM:

+	  make_gdb_type_enum (e);

+	  return;

+	}


-      gdb_assert (f.type != NULL);

-      type *field_gdb_type = f.type->make_gdb_type (gdbarch);

-      append_flags_type_field (flags_gdb_type, f.start, bitsize,

-			       field_gdb_type, f.name.c_str ());

-      }

+      internal_error (__FILE__, __LINE__,

+		      "Type \"%s\" has an unknown kind %d",

+		      e->name.c_str (), e->kind);

+    }


-    return flags_gdb_type;

-  }

+  private:


-  type *make_gdb_type_enum (struct gdbarch *gdbarch) const

-  {

-    type *enum_gdb_type = arch_type (gdbarch, TYPE_CODE_ENUM,

-				   this->size * TARGET_CHAR_BIT,

-				   this->name.c_str ());

+    void make_gdb_type_struct (const tdesc_type_with_fields *e)

+    {

+      m_type = arch_composite_type (m_gdbarch, NULL, TYPE_CODE_STRUCT);

+      TYPE_NAME (m_type) = xstrdup (e->name.c_str ());

+      TYPE_TAG_NAME (m_type) = TYPE_NAME (m_type);


-    TYPE_UNSIGNED (enum_gdb_type) = 1;

-    for (const tdesc_type_field &f : this->fields)

-      {

-      struct field *fld

-	= append_composite_type_field_raw (enum_gdb_type,

+      for (const tdesc_type_field &f : e->fields)

+	{

+	  if (f.start != -1 && f.end != -1)

+	    {

+	      /* Bitfield.  */

+	      struct field *fld;

+	      struct type *field_gdb_type;

+	      int bitsize, total_size;

+

+	      /* This invariant should be preserved while creating types.  */

+	      gdb_assert (e->size != 0);

+	      if (f.type != NULL)

+		field_gdb_type = make_gdb_type (m_gdbarch, f.type);

+	      else if (e->size > 4)

+		field_gdb_type = builtin_type (m_gdbarch)->builtin_uint64;

+	      else

+		field_gdb_type = builtin_type (m_gdbarch)->builtin_uint32;

+

+	      fld = append_composite_type_field_raw

+		      (m_type, xstrdup (f.name.c_str ()), field_gdb_type);

+

+	      /* For little-endian, BITPOS counts from the LSB of

+		 the structure and marks the LSB of the field.  For

+		 big-endian, BITPOS counts from the MSB of the

+		 structure and marks the MSB of the field.  Either

+		 way, it is the number of bits to the "left" of the

+		 field.  To calculate this in big-endian, we need

+		 the total size of the structure.  */

+	      bitsize = f.end - f.start + 1;

+	      total_size = e->size * TARGET_CHAR_BIT;

+	      if (gdbarch_bits_big_endian (m_gdbarch))

+		SET_FIELD_BITPOS (fld[0], total_size - f.start - bitsize);

+	      else

+		SET_FIELD_BITPOS (fld[0], f.start);

+	      FIELD_BITSIZE (fld[0]) = bitsize;

+	    }

+	  else

+	    {

+	      gdb_assert (f.start == -1 && f.end == -1);

+	      type *field_gdb_type = make_gdb_type (m_gdbarch, f.type);

+	      append_composite_type_field (m_type,

 					   xstrdup (f.name.c_str ()),
-					   NULL);

+					   field_gdb_type);

+	    }

+	}


-      SET_FIELD_BITPOS (fld[0], f.start);

-      }

+      if (e->size != 0)

+	TYPE_LENGTH (m_type) = e->size;

+    }


-    return enum_gdb_type;

-  }

+    void make_gdb_type_union (const tdesc_type_with_fields *e)

+    {

+      m_type = arch_composite_type (m_gdbarch, NULL, TYPE_CODE_UNION);

+      TYPE_NAME (m_type) = xstrdup (e->name.c_str ());


-  type *make_gdb_type (struct gdbarch *gdbarch) const override

-  {

-    type *gdb_type = tdesc_find_type (gdbarch, this->name.c_str ());

-    if (gdb_type != NULL)

-      return gdb_type;

+      for (const tdesc_type_field &f : e->fields)

+	{

+	  type* field_gdb_type = make_gdb_type (m_gdbarch, f.type);

+	  append_composite_type_field (m_type, xstrdup (f.name.c_str ()),

+				       field_gdb_type);

+

+	  /* If any of the children of a union are vectors, flag the

+	     union as a vector also.  This allows e.g. a union of two

+	     vector types to show up automatically in "info vector".  */

+	  if (TYPE_VECTOR (field_gdb_type))

+	    TYPE_VECTOR (m_type) = 1;

+	}

+    }


-    switch (this->kind)

+    void make_gdb_type_flags (const tdesc_type_with_fields *e)

     {
-      case TDESC_TYPE_STRUCT:

-	return make_gdb_type_struct (gdbarch);

-      case TDESC_TYPE_UNION:

-	return make_gdb_type_union (gdbarch);

-      case TDESC_TYPE_FLAGS:

-	return make_gdb_type_flags (gdbarch);

-      case TDESC_TYPE_ENUM:

-	return make_gdb_type_enum (gdbarch);

+      m_type = arch_flags_type (m_gdbarch, e->name.c_str (),

+				e->size * TARGET_CHAR_BIT);

+

+      for (const tdesc_type_field &f : e->fields)

+	{

+	  int bitsize = f.end - f.start + 1;

+

+	  gdb_assert (f.type != NULL);

+	  type *field_gdb_type = make_gdb_type (m_gdbarch, f.type);

+	  append_flags_type_field (m_type, f.start, bitsize,

+				   field_gdb_type, f.name.c_str ());

+	}

     }

-    internal_error (__FILE__, __LINE__,

-		    "Type \"%s\" has an unknown kind %d",

-		    this->name.c_str (), this->kind);

+    void make_gdb_type_enum (const tdesc_type_with_fields *e)

+    {

+      m_type = arch_type (m_gdbarch, TYPE_CODE_ENUM, e->size * TARGET_CHAR_BIT,

+			  e->name.c_str ());


-    return NULL;

-  }

+      TYPE_UNSIGNED (m_type) = 1;

+      for (const tdesc_type_field &f : e->fields)

+	{

+	  struct field *fld

+	    = append_composite_type_field_raw (m_type,

+					       xstrdup (f.name.c_str ()),

+					       NULL);


-  std::vector<tdesc_type_field> fields;

-  int size;

-};

+	  SET_FIELD_BITPOS (fld[0], f.start);

+	}

+    }

+

+    /* The gdbarch used.  */

+    struct gdbarch *m_gdbarch;

+

+    /* The type created.  */

+    type *m_type;

+  };

+

+  gdb_type_creator gdb_type (gdbarch);

+  ttype->accept (gdb_type);

+  return gdb_type.get_type ();

+}


 /* A feature from a target description.  Each feature is a collection
    of other elements, e.g. registers and types.  */
@@ -1216,7 +1250,7 @@  tdesc_register_type (struct gdbarch *gdbarch, int regno)

     {
       /* First check for a predefined or target defined type.  */
       if (reg->tdesc_type)
-        arch_reg->type = reg->tdesc_type->make_gdb_type (gdbarch);

+	arch_reg->type = make_gdb_type (gdbarch, reg->tdesc_type);


       /* Next try size-sensitive type shortcuts.  */
       else if (reg->type == "float")