gdb/cp-valprint.c - binutils-gdb - Git at Google

 /* Support for printing C++ values for GDB, the GNU debugger.

    Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
    2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008
    Free Software Foundation, Inc.

    This file is part of GDB.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 #include "defs.h"
 #include "gdb_obstack.h"
 #include "symtab.h"
 #include "gdbtypes.h"
 #include "expression.h"
 #include "value.h"
 #include "command.h"
 #include "gdbcmd.h"
 #include "demangle.h"
 #include "annotate.h"
 #include "gdb_string.h"
 #include "c-lang.h"
 #include "target.h"
 #include "cp-abi.h"
 #include "valprint.h"
 #include "cp-support.h"
 #include "language.h"

 /* Controls printing of vtbl's */
 int vtblprint;
 static void
 show_vtblprint (struct ui_file *file, int from_tty,
 		struct cmd_list_element *c, const char *value)
 {
   fprintf_filtered (file, _("\
 Printing of C++ virtual function tables is %s.\n"),
 		    value);
 }

 /* Controls looking up an object's derived type using what we find in
    its vtables.  */
 int objectprint;
 static void
 show_objectprint (struct ui_file *file, int from_tty,
 		  struct cmd_list_element *c,
 		  const char *value)
 {
   fprintf_filtered (file, _("\
 Printing of object's derived type based on vtable info is %s.\n"),
 		    value);
 }

 int static_field_print;		/* Controls printing of static fields. */
 static void
 show_static_field_print (struct ui_file *file, int from_tty,
 			 struct cmd_list_element *c, const char *value)
 {
   fprintf_filtered (file, _("Printing of C++ static members is %s.\n"),
 		    value);
 }


 static struct obstack dont_print_vb_obstack;
 static struct obstack dont_print_statmem_obstack;

 extern void _initialize_cp_valprint (void);

 static void cp_print_static_field (struct type *, struct value *,
 				   struct ui_file *, int, int,
 				   enum val_prettyprint);

 static void cp_print_value (struct type *, struct type *, const gdb_byte *,
 			    int, CORE_ADDR, struct ui_file *, int, int,
 			    enum val_prettyprint, struct type **);


 /* GCC versions after 2.4.5 use this.  */
 const char vtbl_ptr_name[] = "__vtbl_ptr_type";

 /* Return truth value for assertion that TYPE is of the type
    "pointer to virtual function".  */

 int
 cp_is_vtbl_ptr_type (struct type *type)
 {
   char *typename = type_name_no_tag (type);

   return (typename != NULL && !strcmp (typename, vtbl_ptr_name));
 }

 /* Return truth value for the assertion that TYPE is of the type
    "pointer to virtual function table".  */

 int
 cp_is_vtbl_member (struct type *type)
 {
   /* With older versions of g++, the vtbl field pointed to an array
      of structures.  Nowadays it points directly to the structure. */
   if (TYPE_CODE (type) == TYPE_CODE_PTR)
     {
       type = TYPE_TARGET_TYPE (type);
       if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
 	{
 	  type = TYPE_TARGET_TYPE (type);
 	  if (TYPE_CODE (type) == TYPE_CODE_STRUCT	/* if not using thunks */
 	      || TYPE_CODE (type) == TYPE_CODE_PTR)	/* if using thunks */
 	    {
 	      /* Virtual functions tables are full of pointers
 	         to virtual functions. */
 	      return cp_is_vtbl_ptr_type (type);
 	    }
 	}
       else if (TYPE_CODE (type) == TYPE_CODE_STRUCT)  /* if not using thunks */
 	{
 	  return cp_is_vtbl_ptr_type (type);
 	}
       else if (TYPE_CODE (type) == TYPE_CODE_PTR)     /* if using thunks */
 	{
 	  /* The type name of the thunk pointer is NULL when using dwarf2.
 	     We could test for a pointer to a function, but there is
 	     no type info for the virtual table either, so it wont help.  */
 	  return cp_is_vtbl_ptr_type (type);
 	}
     }
   return 0;
 }

 /* Mutually recursive subroutines of cp_print_value and c_val_print to
    print out a structure's fields: cp_print_value_fields and cp_print_value.

    TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
    same meanings as in cp_print_value and c_val_print.

    2nd argument REAL_TYPE is used to carry over the type of the derived
    class across the recursion to base classes.

    DONT_PRINT is an array of baseclass types that we
    should not print, or zero if called from top level.  */

 void
 cp_print_value_fields (struct type *type, struct type *real_type,
 		       const gdb_byte *valaddr, int offset, CORE_ADDR address,
 		       struct ui_file *stream, int format, int recurse,
 		       enum val_prettyprint pretty,
 		       struct type **dont_print_vb,int dont_print_statmem)
 {
   int i, len, n_baseclasses;
   char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack);
   int fields_seen = 0;

   CHECK_TYPEDEF (type);

   fprintf_filtered (stream, "{");
   len = TYPE_NFIELDS (type);
   n_baseclasses = TYPE_N_BASECLASSES (type);

   /* First, print out baseclasses such that we don't print
      duplicates of virtual baseclasses.  */

   if (n_baseclasses > 0)
     cp_print_value (type, real_type, valaddr, offset, address, stream,
 		    format, recurse + 1, pretty, dont_print_vb);

   /* Second, print out data fields */

   /* If there are no data fields, skip this part */
   if (len == n_baseclasses || !len)
     fprintf_filtered (stream, "<No data fields>");
   else
     {
       struct obstack tmp_obstack = dont_print_statmem_obstack;

       if (dont_print_statmem == 0)
 	{
 	  /* If we're at top level, carve out a completely fresh
 	     chunk of the obstack and use that until this particular
 	     invocation returns.  */
 	  obstack_finish (&dont_print_statmem_obstack);
 	}

       for (i = n_baseclasses; i < len; i++)
 	{
 	  /* If requested, skip printing of static fields.  */
 	  if (!static_field_print && TYPE_FIELD_STATIC (type, i))
 	    continue;

 	  if (fields_seen)
 	    fprintf_filtered (stream, ", ");
 	  else if (n_baseclasses > 0)
 	    {
 	      if (pretty)
 		{
 		  fprintf_filtered (stream, "\n");
 		  print_spaces_filtered (2 + 2 * recurse, stream);
 		  fputs_filtered ("members of ", stream);
 		  fputs_filtered (type_name_no_tag (type), stream);
 		  fputs_filtered (": ", stream);
 		}
 	    }
 	  fields_seen = 1;

 	  if (pretty)
 	    {
 	      fprintf_filtered (stream, "\n");
 	      print_spaces_filtered (2 + 2 * recurse, stream);
 	    }
 	  else
 	    {
 	      wrap_here (n_spaces (2 + 2 * recurse));
 	    }
 	  if (inspect_it)
 	    {
 	      if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
 		fputs_filtered ("\"( ptr \"", stream);
 	      else
 		fputs_filtered ("\"( nodef \"", stream);
 	      if (TYPE_FIELD_STATIC (type, i))
 		fputs_filtered ("static ", stream);
 	      fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 				       current_language->la_language,
 				       DMGL_PARAMS | DMGL_ANSI);
 	      fputs_filtered ("\" \"", stream);
 	      fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 				       current_language->la_language,
 				       DMGL_PARAMS | DMGL_ANSI);
 	      fputs_filtered ("\") \"", stream);
 	    }
 	  else
 	    {
 	      annotate_field_begin (TYPE_FIELD_TYPE (type, i));

 	      if (TYPE_FIELD_STATIC (type, i))
 		fputs_filtered ("static ", stream);
 	      fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
 				       current_language->la_language,
 				       DMGL_PARAMS | DMGL_ANSI);
 	      annotate_field_name_end ();
 	      /* do not print leading '=' in case of anonymous unions */
 	      if (strcmp (TYPE_FIELD_NAME (type, i), ""))
 		fputs_filtered (" = ", stream);
 	      annotate_field_value ();
 	    }

 	  if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
 	    {
 	      struct value *v;

 	      /* Bitfields require special handling, especially due to byte
 	         order problems.  */
 	      if (TYPE_FIELD_IGNORE (type, i))
 		{
 		  fputs_filtered ("<optimized out or zero length>", stream);
 		}
 	      else
 		{
 		  v = value_from_longest
 		    (TYPE_FIELD_TYPE (type, i),
 		     unpack_field_as_long (type, valaddr + offset, i));

 		  common_val_print (v, stream, format, 0, recurse + 1, pretty);
 		}
 	    }
 	  else
 	    {
 	      if (TYPE_FIELD_IGNORE (type, i))
 		{
 		  fputs_filtered ("<optimized out or zero length>", stream);
 		}
 	      else if (TYPE_FIELD_STATIC (type, i))
 		{
 		  struct value *v = value_static_field (type, i);
 		  if (v == NULL)
 		    fputs_filtered ("<optimized out>", stream);
 		  else
 		    cp_print_static_field (TYPE_FIELD_TYPE (type, i), v,
 					   stream, format, recurse + 1,
 					   pretty);
 		}
 	      else
 		{
 		  val_print (TYPE_FIELD_TYPE (type, i),
 			     valaddr, offset + TYPE_FIELD_BITPOS (type, i) / 8,
 			     address + TYPE_FIELD_BITPOS (type, i) / 8,
 			     stream, format, 0, recurse + 1, pretty);
 		}
 	    }
 	  annotate_field_end ();
 	}

       if (dont_print_statmem == 0)
 	{
 	  /* Free the space used to deal with the printing
 	     of the members from top level.  */
 	  obstack_free (&dont_print_statmem_obstack, last_dont_print);
 	  dont_print_statmem_obstack = tmp_obstack;
 	}

       if (pretty)
 	{
 	  fprintf_filtered (stream, "\n");
 	  print_spaces_filtered (2 * recurse, stream);
 	}
     }				/* if there are data fields */

   fprintf_filtered (stream, "}");
 }

 /* Special val_print routine to avoid printing multiple copies of virtual
    baseclasses.  */

 static void
 cp_print_value (struct type *type, struct type *real_type,
 		const gdb_byte *valaddr, int offset, CORE_ADDR address,
 		struct ui_file *stream, int format, int recurse,
 		enum val_prettyprint pretty, struct type **dont_print_vb)
 {
   struct type **last_dont_print
     = (struct type **) obstack_next_free (&dont_print_vb_obstack);
   struct obstack tmp_obstack = dont_print_vb_obstack;
   int i, n_baseclasses = TYPE_N_BASECLASSES (type);
   int thisoffset;
   struct type *thistype;

   if (dont_print_vb == 0)
     {
       /* If we're at top level, carve out a completely fresh
          chunk of the obstack and use that until this particular
          invocation returns.  */
       /* Bump up the high-water mark.  Now alpha is omega.  */
       obstack_finish (&dont_print_vb_obstack);
     }

   for (i = 0; i < n_baseclasses; i++)
     {
       int boffset;
       int skip;
       struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
       char *basename = TYPE_NAME (baseclass);
       const gdb_byte *base_valaddr;

       if (BASETYPE_VIA_VIRTUAL (type, i))
 	{
 	  struct type **first_dont_print
 	    = (struct type **) obstack_base (&dont_print_vb_obstack);

 	  int j = (struct type **) obstack_next_free (&dont_print_vb_obstack)
 	    - first_dont_print;

 	  while (--j >= 0)
 	    if (baseclass == first_dont_print[j])
 	      goto flush_it;

 	  obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
 	}

       thisoffset = offset;
       thistype = real_type;

       boffset = baseclass_offset (type, i, valaddr + offset, address);
       skip = ((boffset == -1) || (boffset + offset) < 0) ? 1 : -1;

       if (BASETYPE_VIA_VIRTUAL (type, i))
 	{
 	  /* The virtual base class pointer might have been
 	     clobbered by the user program. Make sure that it
 	     still points to a valid memory location.  */

 	  if (boffset != -1
 	      && ((boffset + offset) < 0
 		  || (boffset + offset) >= TYPE_LENGTH (type)))
 	    {
 	      /* FIXME (alloca): unsafe if baseclass is really really large. */
 	      gdb_byte *buf = alloca (TYPE_LENGTH (baseclass));
 	      base_valaddr = buf;
 	      if (target_read_memory (address + boffset, buf,
 				      TYPE_LENGTH (baseclass)) != 0)
 		skip = 1;
 	      address = address + boffset;
 	      thisoffset = 0;
 	      boffset = 0;
 	      thistype = baseclass;
 	    }
 	  else
 	    base_valaddr = valaddr;
 	}
       else
 	base_valaddr = valaddr;

       /* now do the printing */
       if (pretty)
 	{
 	  fprintf_filtered (stream, "\n");
 	  print_spaces_filtered (2 * recurse, stream);
 	}
       fputs_filtered ("<", stream);
       /* Not sure what the best notation is in the case where there is no
          baseclass name.  */
       fputs_filtered (basename ? basename : "", stream);
       fputs_filtered ("> = ", stream);


       if (skip >= 1)
 	fprintf_filtered (stream, "<invalid address>");
       else
 	cp_print_value_fields (baseclass, thistype, base_valaddr,
 			       thisoffset + boffset, address + boffset,
 			       stream, format,
 			       recurse, pretty,
 			       ((struct type **)
 				obstack_base (&dont_print_vb_obstack)),
 			       0);
       fputs_filtered (", ", stream);

     flush_it:
       ;
     }

   if (dont_print_vb == 0)
     {
       /* Free the space used to deal with the printing
          of this type from top level.  */
       obstack_free (&dont_print_vb_obstack, last_dont_print);
       /* Reset watermark so that we can continue protecting
          ourselves from whatever we were protecting ourselves.  */
       dont_print_vb_obstack = tmp_obstack;
     }
 }

 /* Print value of a static member.
    To avoid infinite recursion when printing a class that contains
    a static instance of the class, we keep the addresses of all printed
    static member classes in an obstack and refuse to print them more
    than once.

    VAL contains the value to print, TYPE, STREAM, RECURSE, and PRETTY
    have the same meanings as in c_val_print.  */

 static void
 cp_print_static_field (struct type *type,
 		       struct value *val,
 		       struct ui_file *stream,
 		       int format,
 		       int recurse,
 		       enum val_prettyprint pretty)
 {
   if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
     {
       CORE_ADDR *first_dont_print;
       int i;

       first_dont_print
 	= (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
       i = (CORE_ADDR *) obstack_next_free (&dont_print_statmem_obstack)
 	- first_dont_print;

       while (--i >= 0)
 	{
 	  if (VALUE_ADDRESS (val) == first_dont_print[i])
 	    {
 	      fputs_filtered ("<same as static member of an already"
 			      " seen type>",
 			      stream);
 	      return;
 	    }
 	}

       obstack_grow (&dont_print_statmem_obstack, (char *) &VALUE_ADDRESS (val),
 		    sizeof (CORE_ADDR));

       CHECK_TYPEDEF (type);
       cp_print_value_fields (type, type, value_contents_all (val),
 			     value_embedded_offset (val), VALUE_ADDRESS (val),
 			     stream, format, recurse, pretty, NULL, 1);
       return;
     }
   val_print (type, value_contents_all (val),
 	     value_embedded_offset (val), VALUE_ADDRESS (val),
 	     stream, format, 0, recurse, pretty);
 }


 /* Find the field in *DOMAIN, or its non-virtual base classes, with bit offset
    OFFSET.  Set *DOMAIN to the containing type and *FIELDNO to the containing
    field number.  If OFFSET is not exactly at the start of some field, set
    *DOMAIN to NULL.  */

 void
 cp_find_class_member (struct type **domain_p, int *fieldno,
 		      LONGEST offset)
 {
   struct type *domain;
   unsigned int i;
   unsigned len;

   *domain_p = check_typedef (*domain_p);
   domain = *domain_p;
   len = TYPE_NFIELDS (domain);

   for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
     {
       LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i);

       QUIT;
       if (offset == bitpos)
 	{
 	  *fieldno = i;
 	  return;
 	}
     }

   for (i = 0; i < TYPE_N_BASECLASSES (domain); i++)
     {
       LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i);
       LONGEST bitsize = 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (domain, i));

       if (offset >= bitpos && offset < bitpos + bitsize)
 	{
 	  *domain_p = TYPE_FIELD_TYPE (domain, i);
 	  cp_find_class_member (domain_p, fieldno, offset - bitpos);
 	  return;
 	}
     }

   *domain_p = NULL;
 }

 void
 cp_print_class_member (const gdb_byte *valaddr, struct type *domain,
 		       struct ui_file *stream, char *prefix)
 {
   /* VAL is a byte offset into the structure type DOMAIN.
      Find the name of the field for that offset and
      print it.  */
   unsigned int fieldno;

   LONGEST val = unpack_long (builtin_type_long, valaddr);

   /* Pointers to data members are usually byte offsets into an object.
      Because a data member can have offset zero, and a NULL pointer to
      member must be distinct from any valid non-NULL pointer to
      member, either the value is biased or the NULL value has a
      special representation; both are permitted by ISO C++.  HP aCC
      used a bias of 0x20000000; HP cfront used a bias of 1; g++ 3.x
      and other compilers which use the Itanium ABI use -1 as the NULL
      value.  GDB only supports that last form; to add support for
      another form, make this into a cp-abi hook.  */

   if (val == -1)
     {
       fprintf_filtered (stream, "NULL");
       return;
     }

   cp_find_class_member (&domain, &fieldno, val << 3);

   if (domain != NULL)
     {
       char *name;
       fputs_filtered (prefix, stream);
       name = type_name_no_tag (domain);
       if (name)
 	fputs_filtered (name, stream);
       else
 	c_type_print_base (domain, stream, 0, 0);
       fprintf_filtered (stream, "::");
       fputs_filtered (TYPE_FIELD_NAME (domain, fieldno), stream);
     }
   else
     fprintf_filtered (stream, "%ld", (long) val);
 }


 void
 _initialize_cp_valprint (void)
 {
   add_setshow_boolean_cmd ("static-members", class_support,
 			   &static_field_print, _("\
 Set printing of C++ static members."), _("\
 Show printing of C++ static members."), NULL,
 			   NULL,
 			   show_static_field_print,
 			   &setprintlist, &showprintlist);
   /* Turn on printing of static fields.  */
   static_field_print = 1;

   add_setshow_boolean_cmd ("vtbl", class_support, &vtblprint, _("\
 Set printing of C++ virtual function tables."), _("\
 Show printing of C++ virtual function tables."), NULL,
 			   NULL,
 			   show_vtblprint,
 			   &setprintlist, &showprintlist);

   add_setshow_boolean_cmd ("object", class_support, &objectprint, _("\
 Set printing of object's derived type based on vtable info."), _("\
 Show printing of object's derived type based on vtable info."), NULL,
 			   NULL,
 			   show_objectprint,
 			   &setprintlist, &showprintlist);

   /* Give people the defaults which they are used to.  */
   objectprint = 0;
   vtblprint = 0;
   obstack_begin (&dont_print_vb_obstack, 32 * sizeof (struct type *));
   obstack_specify_allocation (&dont_print_statmem_obstack,
 			      32 * sizeof (CORE_ADDR), sizeof (CORE_ADDR),
 			      xmalloc, xfree);
 }
	/* Support for printing C++ values for GDB, the GNU debugger.

	Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
	2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008
	Free Software Foundation, Inc.

	This file is part of GDB.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program. If not, see <http://www.gnu.org/licenses/>. */

	#include "defs.h"
	#include "gdb_obstack.h"
	#include "symtab.h"
	#include "gdbtypes.h"
	#include "expression.h"
	#include "value.h"
	#include "command.h"
	#include "gdbcmd.h"
	#include "demangle.h"
	#include "annotate.h"
	#include "gdb_string.h"
	#include "c-lang.h"
	#include "target.h"
	#include "cp-abi.h"
	#include "valprint.h"
	#include "cp-support.h"
	#include "language.h"

	/* Controls printing of vtbl's */
	int vtblprint;
	static void
	show_vtblprint (struct ui_file *file, int from_tty,
	struct cmd_list_element c, const char value)
	{
	fprintf_filtered (file, _("\
	Printing of C++ virtual function tables is %s.\n"),
	value);
	}

	/* Controls looking up an object's derived type using what we find in
	its vtables. */
	int objectprint;
	static void
	show_objectprint (struct ui_file *file, int from_tty,
	struct cmd_list_element *c,
	const char *value)
	{
	fprintf_filtered (file, _("\
	Printing of object's derived type based on vtable info is %s.\n"),
	value);
	}

	int static_field_print; /* Controls printing of static fields. */
	static void
	show_static_field_print (struct ui_file *file, int from_tty,
	struct cmd_list_element c, const char value)
	{
	fprintf_filtered (file, _("Printing of C++ static members is %s.\n"),
	value);
	}


	static struct obstack dont_print_vb_obstack;
	static struct obstack dont_print_statmem_obstack;

	extern void _initialize_cp_valprint (void);

	static void cp_print_static_field (struct type , struct value ,
	struct ui_file *, int, int,
	enum val_prettyprint);

	static void cp_print_value (struct type , struct type , const gdb_byte *,
	int, CORE_ADDR, struct ui_file *, int, int,
	enum val_prettyprint, struct type **);


	/* GCC versions after 2.4.5 use this. */
	const char vtbl_ptr_name[] = "__vtbl_ptr_type";

	/* Return truth value for assertion that TYPE is of the type
	"pointer to virtual function". */

	int
	cp_is_vtbl_ptr_type (struct type *type)
	{
	char *typename = type_name_no_tag (type);

	return (typename != NULL && !strcmp (typename, vtbl_ptr_name));
	}

	/* Return truth value for the assertion that TYPE is of the type
	"pointer to virtual function table". */

	int
	cp_is_vtbl_member (struct type *type)
	{
	/* With older versions of g++, the vtbl field pointed to an array
	of structures. Nowadays it points directly to the structure. */
	if (TYPE_CODE (type) == TYPE_CODE_PTR)
	{
	type = TYPE_TARGET_TYPE (type);
	if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
	{
	type = TYPE_TARGET_TYPE (type);
	if (TYPE_CODE (type) == TYPE_CODE_STRUCT /* if not using thunks */
	\|\| TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
	{
	/* Virtual functions tables are full of pointers
	to virtual functions. */
	return cp_is_vtbl_ptr_type (type);
	}
	}
	else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) /* if not using thunks */
	{
	return cp_is_vtbl_ptr_type (type);
	}
	else if (TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
	{
	/* The type name of the thunk pointer is NULL when using dwarf2.
	We could test for a pointer to a function, but there is
	no type info for the virtual table either, so it wont help. */
	return cp_is_vtbl_ptr_type (type);
	}
	}
	return 0;
	}

	/* Mutually recursive subroutines of cp_print_value and c_val_print to
	print out a structure's fields: cp_print_value_fields and cp_print_value.

	TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
	same meanings as in cp_print_value and c_val_print.

	2nd argument REAL_TYPE is used to carry over the type of the derived
	class across the recursion to base classes.

	DONT_PRINT is an array of baseclass types that we
	should not print, or zero if called from top level. */

	void
	cp_print_value_fields (struct type type, struct type real_type,
	const gdb_byte *valaddr, int offset, CORE_ADDR address,
	struct ui_file *stream, int format, int recurse,
	enum val_prettyprint pretty,
	struct type **dont_print_vb,int dont_print_statmem)
	{
	int i, len, n_baseclasses;
	char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack);
	int fields_seen = 0;

	CHECK_TYPEDEF (type);

	fprintf_filtered (stream, "{");
	len = TYPE_NFIELDS (type);
	n_baseclasses = TYPE_N_BASECLASSES (type);

	/* First, print out baseclasses such that we don't print
	duplicates of virtual baseclasses. */

	if (n_baseclasses > 0)
	cp_print_value (type, real_type, valaddr, offset, address, stream,
	format, recurse + 1, pretty, dont_print_vb);

	/* Second, print out data fields */

	/* If there are no data fields, skip this part */
	if (len == n_baseclasses \|\| !len)
	fprintf_filtered (stream, "<No data fields>");
	else
	{
	struct obstack tmp_obstack = dont_print_statmem_obstack;

	if (dont_print_statmem == 0)
	{
	/* If we're at top level, carve out a completely fresh
	chunk of the obstack and use that until this particular
	invocation returns. */
	obstack_finish (&dont_print_statmem_obstack);
	}

	for (i = n_baseclasses; i < len; i++)
	{
	/* If requested, skip printing of static fields. */
	if (!static_field_print && TYPE_FIELD_STATIC (type, i))
	continue;

	if (fields_seen)
	fprintf_filtered (stream, ", ");
	else if (n_baseclasses > 0)
	{
	if (pretty)
	{
	fprintf_filtered (stream, "\n");
	print_spaces_filtered (2 + 2 * recurse, stream);
	fputs_filtered ("members of ", stream);
	fputs_filtered (type_name_no_tag (type), stream);
	fputs_filtered (": ", stream);
	}
	}
	fields_seen = 1;

	if (pretty)
	{
	fprintf_filtered (stream, "\n");
	print_spaces_filtered (2 + 2 * recurse, stream);
	}
	else
	{
	wrap_here (n_spaces (2 + 2 * recurse));
	}
	if (inspect_it)
	{
	if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
	fputs_filtered ("\"( ptr \"", stream);
	else
	fputs_filtered ("\"( nodef \"", stream);
	if (TYPE_FIELD_STATIC (type, i))
	fputs_filtered ("static ", stream);
	fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
	current_language->la_language,
	DMGL_PARAMS \| DMGL_ANSI);
	fputs_filtered ("\" \"", stream);
	fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
	current_language->la_language,
	DMGL_PARAMS \| DMGL_ANSI);
	fputs_filtered ("\") \"", stream);
	}
	else
	{
	annotate_field_begin (TYPE_FIELD_TYPE (type, i));

	if (TYPE_FIELD_STATIC (type, i))
	fputs_filtered ("static ", stream);
	fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
	current_language->la_language,
	DMGL_PARAMS \| DMGL_ANSI);
	annotate_field_name_end ();
	/* do not print leading '=' in case of anonymous unions */
	if (strcmp (TYPE_FIELD_NAME (type, i), ""))
	fputs_filtered (" = ", stream);
	annotate_field_value ();
	}

	if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
	{
	struct value *v;

	/* Bitfields require special handling, especially due to byte
	order problems. */
	if (TYPE_FIELD_IGNORE (type, i))
	{
	fputs_filtered ("<optimized out or zero length>", stream);
	}
	else
	{
	v = value_from_longest
	(TYPE_FIELD_TYPE (type, i),
	unpack_field_as_long (type, valaddr + offset, i));

	common_val_print (v, stream, format, 0, recurse + 1, pretty);
	}
	}
	else
	{
	if (TYPE_FIELD_IGNORE (type, i))
	{
	fputs_filtered ("<optimized out or zero length>", stream);
	}
	else if (TYPE_FIELD_STATIC (type, i))
	{
	struct value *v = value_static_field (type, i);
	if (v == NULL)
	fputs_filtered ("<optimized out>", stream);
	else
	cp_print_static_field (TYPE_FIELD_TYPE (type, i), v,
	stream, format, recurse + 1,
	pretty);
	}
	else
	{
	val_print (TYPE_FIELD_TYPE (type, i),
	valaddr, offset + TYPE_FIELD_BITPOS (type, i) / 8,
	address + TYPE_FIELD_BITPOS (type, i) / 8,
	stream, format, 0, recurse + 1, pretty);
	}
	}
	annotate_field_end ();
	}

	if (dont_print_statmem == 0)
	{
	/* Free the space used to deal with the printing
	of the members from top level. */
	obstack_free (&dont_print_statmem_obstack, last_dont_print);
	dont_print_statmem_obstack = tmp_obstack;
	}

	if (pretty)
	{
	fprintf_filtered (stream, "\n");
	print_spaces_filtered (2 * recurse, stream);
	}
	} /* if there are data fields */

	fprintf_filtered (stream, "}");
	}

	/* Special val_print routine to avoid printing multiple copies of virtual
	baseclasses. */

	static void
	cp_print_value (struct type type, struct type real_type,
	const gdb_byte *valaddr, int offset, CORE_ADDR address,
	struct ui_file *stream, int format, int recurse,
	enum val_prettyprint pretty, struct type **dont_print_vb)
	{
	struct type **last_dont_print
	= (struct type **) obstack_next_free (&dont_print_vb_obstack);
	struct obstack tmp_obstack = dont_print_vb_obstack;
	int i, n_baseclasses = TYPE_N_BASECLASSES (type);
	int thisoffset;
	struct type *thistype;

	if (dont_print_vb == 0)
	{
	/* If we're at top level, carve out a completely fresh
	chunk of the obstack and use that until this particular
	invocation returns. */
	/* Bump up the high-water mark. Now alpha is omega. */
	obstack_finish (&dont_print_vb_obstack);
	}

	for (i = 0; i < n_baseclasses; i++)
	{
	int boffset;
	int skip;
	struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
	char *basename = TYPE_NAME (baseclass);
	const gdb_byte *base_valaddr;

	if (BASETYPE_VIA_VIRTUAL (type, i))
	{
	struct type **first_dont_print
	= (struct type **) obstack_base (&dont_print_vb_obstack);

	int j = (struct type **) obstack_next_free (&dont_print_vb_obstack)
	- first_dont_print;

	while (--j >= 0)
	if (baseclass == first_dont_print[j])
	goto flush_it;

	obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
	}

	thisoffset = offset;
	thistype = real_type;

	boffset = baseclass_offset (type, i, valaddr + offset, address);
	skip = ((boffset == -1) \|\| (boffset + offset) < 0) ? 1 : -1;

	if (BASETYPE_VIA_VIRTUAL (type, i))
	{
	/* The virtual base class pointer might have been
	clobbered by the user program. Make sure that it
	still points to a valid memory location. */

	if (boffset != -1
	&& ((boffset + offset) < 0
	\|\| (boffset + offset) >= TYPE_LENGTH (type)))
	{
	/* FIXME (alloca): unsafe if baseclass is really really large. */
	gdb_byte *buf = alloca (TYPE_LENGTH (baseclass));
	base_valaddr = buf;
	if (target_read_memory (address + boffset, buf,
	TYPE_LENGTH (baseclass)) != 0)
	skip = 1;
	address = address + boffset;
	thisoffset = 0;
	boffset = 0;
	thistype = baseclass;
	}
	else
	base_valaddr = valaddr;
	}
	else
	base_valaddr = valaddr;

	/* now do the printing */
	if (pretty)
	{
	fprintf_filtered (stream, "\n");
	print_spaces_filtered (2 * recurse, stream);
	}
	fputs_filtered ("<", stream);
	/* Not sure what the best notation is in the case where there is no
	baseclass name. */
	fputs_filtered (basename ? basename : "", stream);
	fputs_filtered ("> = ", stream);


	if (skip >= 1)
	fprintf_filtered (stream, "<invalid address>");
	else
	cp_print_value_fields (baseclass, thistype, base_valaddr,
	thisoffset + boffset, address + boffset,
	stream, format,
	recurse, pretty,
	((struct type **)
	obstack_base (&dont_print_vb_obstack)),
	0);
	fputs_filtered (", ", stream);

	flush_it:
	;
	}

	if (dont_print_vb == 0)
	{
	/* Free the space used to deal with the printing
	of this type from top level. */
	obstack_free (&dont_print_vb_obstack, last_dont_print);
	/* Reset watermark so that we can continue protecting
	ourselves from whatever we were protecting ourselves. */
	dont_print_vb_obstack = tmp_obstack;
	}
	}

	/* Print value of a static member.
	To avoid infinite recursion when printing a class that contains
	a static instance of the class, we keep the addresses of all printed
	static member classes in an obstack and refuse to print them more
	than once.

	VAL contains the value to print, TYPE, STREAM, RECURSE, and PRETTY
	have the same meanings as in c_val_print. */

	static void
	cp_print_static_field (struct type *type,
	struct value *val,
	struct ui_file *stream,
	int format,
	int recurse,
	enum val_prettyprint pretty)
	{
	if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
	{
	CORE_ADDR *first_dont_print;
	int i;

	first_dont_print
	= (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
	i = (CORE_ADDR *) obstack_next_free (&dont_print_statmem_obstack)
	- first_dont_print;

	while (--i >= 0)
	{
	if (VALUE_ADDRESS (val) == first_dont_print[i])
	{
	fputs_filtered ("<same as static member of an already"
	" seen type>",
	stream);
	return;
	}
	}

	obstack_grow (&dont_print_statmem_obstack, (char *) &VALUE_ADDRESS (val),
	sizeof (CORE_ADDR));

	CHECK_TYPEDEF (type);
	cp_print_value_fields (type, type, value_contents_all (val),
	value_embedded_offset (val), VALUE_ADDRESS (val),
	stream, format, recurse, pretty, NULL, 1);
	return;
	}
	val_print (type, value_contents_all (val),
	value_embedded_offset (val), VALUE_ADDRESS (val),
	stream, format, 0, recurse, pretty);
	}


	/* Find the field in *DOMAIN, or its non-virtual base classes, with bit offset
	OFFSET. Set DOMAIN to the containing type and FIELDNO to the containing
	field number. If OFFSET is not exactly at the start of some field, set
	DOMAIN to NULL. /

	void
	cp_find_class_member (struct type *domain_p, int fieldno,
	LONGEST offset)
	{
	struct type *domain;
	unsigned int i;
	unsigned len;

	domain_p = check_typedef (domain_p);
	domain = *domain_p;
	len = TYPE_NFIELDS (domain);

	for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
	{
	LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i);

	QUIT;
	if (offset == bitpos)
	{
	*fieldno = i;
	return;
	}
	}

	for (i = 0; i < TYPE_N_BASECLASSES (domain); i++)
	{
	LONGEST bitpos = TYPE_FIELD_BITPOS (domain, i);
	LONGEST bitsize = 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (domain, i));

	if (offset >= bitpos && offset < bitpos + bitsize)
	{
	*domain_p = TYPE_FIELD_TYPE (domain, i);
	cp_find_class_member (domain_p, fieldno, offset - bitpos);
	return;
	}
	}

	*domain_p = NULL;
	}

	void
	cp_print_class_member (const gdb_byte valaddr, struct type domain,
	struct ui_file stream, char prefix)
	{
	/* VAL is a byte offset into the structure type DOMAIN.
	Find the name of the field for that offset and
	print it. */
	unsigned int fieldno;

	LONGEST val = unpack_long (builtin_type_long, valaddr);

	/* Pointers to data members are usually byte offsets into an object.
	Because a data member can have offset zero, and a NULL pointer to
	member must be distinct from any valid non-NULL pointer to
	member, either the value is biased or the NULL value has a
	special representation; both are permitted by ISO C++. HP aCC
	used a bias of 0x20000000; HP cfront used a bias of 1; g++ 3.x
	and other compilers which use the Itanium ABI use -1 as the NULL
	value. GDB only supports that last form; to add support for
	another form, make this into a cp-abi hook. */

	if (val == -1)
	{
	fprintf_filtered (stream, "NULL");
	return;
	}

	cp_find_class_member (&domain, &fieldno, val << 3);

	if (domain != NULL)
	{
	char *name;
	fputs_filtered (prefix, stream);
	name = type_name_no_tag (domain);
	if (name)
	fputs_filtered (name, stream);
	else
	c_type_print_base (domain, stream, 0, 0);
	fprintf_filtered (stream, "::");
	fputs_filtered (TYPE_FIELD_NAME (domain, fieldno), stream);
	}
	else
	fprintf_filtered (stream, "%ld", (long) val);
	}


	void
	_initialize_cp_valprint (void)
	{
	add_setshow_boolean_cmd ("static-members", class_support,
	&static_field_print, _("\
	Set printing of C++ static members."), _("\
	Show printing of C++ static members."), NULL,
	NULL,
	show_static_field_print,
	&setprintlist, &showprintlist);
	/* Turn on printing of static fields. */
	static_field_print = 1;

	add_setshow_boolean_cmd ("vtbl", class_support, &vtblprint, _("\
	Set printing of C++ virtual function tables."), _("\
	Show printing of C++ virtual function tables."), NULL,
	NULL,
	show_vtblprint,
	&setprintlist, &showprintlist);

	add_setshow_boolean_cmd ("object", class_support, &objectprint, _("\
	Set printing of object's derived type based on vtable info."), _("\
	Show printing of object's derived type based on vtable info."), NULL,
	NULL,
	show_objectprint,
	&setprintlist, &showprintlist);

	/* Give people the defaults which they are used to. */
	objectprint = 0;
	vtblprint = 0;
	obstack_begin (&dont_print_vb_obstack, 32 * sizeof (struct type *));
	obstack_specify_allocation (&dont_print_statmem_obstack,
	32 * sizeof (CORE_ADDR), sizeof (CORE_ADDR),
	xmalloc, xfree);
	}