[rfa] space reduction in gdbtypes.h

[Michael Elizabeth Chastain <mec at shout dot net>]

More space reduction!  This is the last of the low-hanging fruit.

  before: 90001408
  after:  87068672

This is a re-arrangement of 'struct main_type'.

  struct main_type  52  40

Testing: native i686-pc-linux-gnu, gcc v2 and v3, dwarf-2 and stabs+.
Full test suite, not regressions.

Okay to commit?

Michael C

2003-08-20  Michael Chastain  <mec@shout.net>

	* gdbtypes.h (struct main_type): Rearrange to save space.

Index: gdbtypes.h
===================================================================
RCS file: /cvs/src/src/gdb/gdbtypes.h,v
retrieving revision 1.48
diff -u -r1.48 gdbtypes.h
--- gdbtypes.h	23 Jun 2003 21:05:40 -0000	1.48
+++ gdbtypes.h	20 Aug 2003 02:53:46 -0000
@@ -274,10 +274,6 @@
 
 struct main_type
 {
-  /* Code for kind of type */
-
-  enum type_code code;
-
   /* Name of this type, or NULL if none.
 
      This is used for printing only, except by poorly designed C++ code.
@@ -298,6 +294,10 @@
 
   char *tag_name;
 
+  /* Code for kind of type */
+
+  ENUM_BITFIELD(type_code) code : 8;
+
   /* FIXME, these should probably be restricted to a Fortran-specific
      field in some fashion.  */
 #define BOUND_CANNOT_BE_DETERMINED   5
@@ -306,8 +306,8 @@
 #define BOUND_BY_REF_IN_REG          2
 #define BOUND_BY_VALUE_IN_REG        1
 #define BOUND_SIMPLE                 0
-  int upper_bound_type;
-  int lower_bound_type;
+  int upper_bound_type : 4;
+  int lower_bound_type : 4;
 
   /* Every type is now associated with a particular objfile, and the
      type is allocated on the type_obstack for that objfile.  One problem
@@ -340,6 +340,15 @@
 
   short nfields;
 
+  /* Field number of the virtual function table pointer in
+     VPTR_BASETYPE.  If -1, we were unable to find the virtual
+     function table pointer in initial symbol reading, and
+     fill_in_vptr_fieldno should be called to find it if possible.
+
+     Unused if this type does not have virtual functions.  */
+
+  short vptr_fieldno;
+
   /* For structure and union types, a description of each field.
      For set and pascal array types, there is one "field",
      whose type is the domain type of the set or array.
@@ -420,15 +429,6 @@
      Unused otherwise.  */
 
   struct type *vptr_basetype;
-
-  /* Field number of the virtual function table pointer in
-     VPTR_BASETYPE.  If -1, we were unable to find the virtual
-     function table pointer in initial symbol reading, and
-     fill_in_vptr_fieldno should be called to find it if possible.
-
-     Unused if this type does not have virtual functions.  */
-
-  int vptr_fieldno;
 
   /* Slot to point to additional language-specific fields of this type.  */