[deliverable/binutils-gdb.git] / gdb / cp-valprint.c

/* Support for printing C++ values for GDB, the GNU debugger.
   Copyright 1986, 1988, 1989, 1991 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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "obstack.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "command.h"
#include "gdbcmd.h"

int vtblprint;			/* Controls printing of vtbl's */
int objectprint;		/* Controls looking up an object's derived type
				   using what we find in its vtables.  */
struct obstack dont_print_obstack;

static void
cplus_print_value PARAMS ((struct type *, char *, FILE *, int, int,
			   enum val_prettyprint, struct type **));

/* BEGIN-FIXME:  Hooks into typeprint.c, find a better home for prototypes. */

extern void
c_type_print_base PARAMS ((struct type *, FILE *, int, int));

extern void
c_type_print_varspec_prefix PARAMS ((struct type *, FILE *, int, int));

extern void
cp_type_print_method_args PARAMS ((struct type **, char *, char *, int,
				   FILE *));

extern struct obstack dont_print_obstack;

/* END-FIXME */


/* BEGIN-FIXME:  Hooks into c-valprint.c */

extern int
c_val_print PARAMS ((struct type *, char *, CORE_ADDR, FILE *, int, int, int,
		     enum val_prettyprint));
/* END-FIXME */


void
cp_print_class_method (valaddr, type, stream)
     char *valaddr;
     struct type *type;
     FILE *stream;
{
  struct type *domain;
  struct fn_field *f;
  int j;
  int len2;
  int offset;
  char *kind = "";
  CORE_ADDR addr;
  struct symbol *sym;
  unsigned len;
  unsigned int i;

  domain = TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type));
  addr = unpack_pointer (lookup_pointer_type (builtin_type_void), valaddr);
  if (METHOD_PTR_IS_VIRTUAL (addr))
    {
      offset = METHOD_PTR_TO_VOFFSET (addr);
      len = TYPE_NFN_FIELDS (domain);
      for (i = 0; i < len; i++)
	{
	  f = TYPE_FN_FIELDLIST1 (domain, i);
	  len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
	  
	  for (j = 0; j < len2; j++)
	    {
	      QUIT;
	      if (TYPE_FN_FIELD_VOFFSET (f, j) == offset)
		{
		  kind = "virtual ";
		  goto common;
		}
	    }
	}
    }
  else
    {
      sym = find_pc_function (addr);
      if (sym == 0)
	{
	  error ("invalid pointer to member function");
	}
      len = TYPE_NFN_FIELDS (domain);
      for (i = 0; i < len; i++)
	{
	  f = TYPE_FN_FIELDLIST1 (domain, i);
	  len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
	  
	  for (j = 0; j < len2; j++)
	    {
	      QUIT;
	      if (STREQ (SYMBOL_NAME (sym), TYPE_FN_FIELD_PHYSNAME (f, j)))
		{
		  goto common;
		}
	    }
	}
    }
  common:
  if (i < len)
    {
      fprintf_filtered (stream, "&");
      c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f, j), stream, 0, 0);
      fprintf (stream, kind);
      if (TYPE_FN_FIELD_PHYSNAME (f, j)[0] == '_'
	  && TYPE_FN_FIELD_PHYSNAME (f, j)[1] == CPLUS_MARKER)
	{
	  cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j) + 1, "~",
				     TYPE_FN_FIELDLIST_NAME (domain, i),
				     0, stream);
	}
      else
	{
	  cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j), "",
				     TYPE_FN_FIELDLIST_NAME (domain, i),
				     0, stream);
	}
    }
  else
    {
      fprintf_filtered (stream, "(");
      type_print (type, "", stream, -1);
      fprintf_filtered (stream, ") %d", (int) addr >> 3);
    }
}

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

int
cp_is_vtbl_ptr_type(type)
     struct type *type;
{
  char *typename = type_name_no_tag (type);
  static const char vtbl_ptr_name[] =
    { CPLUS_MARKER,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };

  return (typename != NULL && STREQ(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(type)
     struct type *type;
{
  if (TYPE_CODE (type) == TYPE_CODE_PTR)
    type = TYPE_TARGET_TYPE (type);
  else
    return 0;

  if (TYPE_CODE (type) == TYPE_CODE_ARRAY
      && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT)
    /* Virtual functions tables are full of pointers to virtual functions.  */
    return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type));
  return 0;
}

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

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

   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 (type, valaddr, stream, format, recurse, pretty,
		       dont_print)
     struct type *type;
     char *valaddr;
     FILE *stream;
     int format;
     int recurse;
     enum val_prettyprint pretty;
     struct type **dont_print;
{
  int i, len, n_baseclasses;

  check_stub_type (type);

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

  /* Print out baseclasses such that we don't print
     duplicates of virtual baseclasses.  */
  if (n_baseclasses > 0)
    cplus_print_value (type, valaddr, stream, format, recurse+1, pretty,
		       dont_print);

  if (!len && n_baseclasses == 1)
    fprintf_filtered (stream, "<No data fields>");
  else
    {
      extern int inspect_it;
      int fields_seen = 0;

      for (i = n_baseclasses; i < len; i++)
	{
	  /* Check if static field */
	  if (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);
	      fprint_symbol (stream, TYPE_FIELD_NAME (type, i));
	      fputs_filtered ("\" \"", stream);
	      fprint_symbol (stream, TYPE_FIELD_NAME (type, i));
	      fputs_filtered ("\") \"", stream);
	    }
	  else
	    {
	      fprint_symbol (stream, TYPE_FIELD_NAME (type, i));
	      fputs_filtered (" = ", stream);
	    }
	  if (TYPE_FIELD_PACKED (type, i))
	    {
	      value v;

	      /* Bitfields require special handling, especially due to byte
		 order problems.  */
	      v = value_from_longest (TYPE_FIELD_TYPE (type, i),
				   unpack_field_as_long (type, valaddr, i));

	      c_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
			   stream, format, 0, recurse + 1, pretty);
	    }
	  else
	    {
	      c_val_print (TYPE_FIELD_TYPE (type, i), 
			   valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
			   0, stream, format, 0, recurse + 1, pretty);
	    }
	}
      if (pretty)
	{
	  fprintf_filtered (stream, "\n");
	  print_spaces_filtered (2 * recurse, stream);
	}
    }
  fprintf_filtered (stream, "}");
}

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

static void
cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print)
     struct type *type;
     char *valaddr;
     FILE *stream;
     int format;
     int recurse;
     enum val_prettyprint pretty;
     struct type **dont_print;
{
  struct obstack tmp_obstack;
  struct type **last_dont_print
    = (struct type **)obstack_next_free (&dont_print_obstack);
  int i, n_baseclasses = TYPE_N_BASECLASSES (type);

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

  for (i = 0; i < n_baseclasses; i++)
    {
      char *baddr;
      int err;

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

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

	  while (--j >= 0)
	    if (TYPE_BASECLASS (type, i) == first_dont_print[j])
	      goto flush_it;

	  obstack_ptr_grow (&dont_print_obstack, TYPE_BASECLASS (type, i));
	}

      /* Fix to use baseclass_offset instead. FIXME */
      baddr = baseclass_addr (type, i, valaddr, 0, &err);
      if (err == 0 && baddr == 0)
	error ("could not find virtual baseclass `%s'\n",
	       type_name_no_tag (TYPE_BASECLASS (type, i)));

      if (pretty)
	{
	  fprintf_filtered (stream, "\n");
	  print_spaces_filtered (2 * recurse, stream);
	}
      fputs_filtered ("<", stream);
      fputs_filtered (type_name_no_tag (TYPE_BASECLASS (type, i)), stream);
      fputs_filtered ("> = ", stream);
      if (err != 0)
	fprintf_filtered (stream, "<invalid address 0x%x>", baddr);
      else
	cp_print_value_fields (TYPE_BASECLASS (type, i), baddr, stream, format,
			       recurse, pretty,
			       (struct type **) obstack_base (&dont_print_obstack));
      fputs_filtered (", ", stream);

    flush_it:
      ;
    }

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

void
cp_print_class_member (valaddr, domain, stream, prefix)
     char *valaddr;
     struct type *domain;
     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.  */
  int extra = 0;
  int bits = 0;
  register unsigned int i;
  unsigned len = TYPE_NFIELDS (domain);
  /* @@ Make VAL into bit offset */
  LONGEST val = unpack_long (builtin_type_int, valaddr) << 3;
  for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
    {
      int bitpos = TYPE_FIELD_BITPOS (domain, i);
      QUIT;
      if (val == bitpos)
	break;
      if (val < bitpos && i != 0)
	{
	  /* Somehow pointing into a field.  */
	  i -= 1;
	  extra = (val - TYPE_FIELD_BITPOS (domain, i));
	  if (extra & 0x7)
	    bits = 1;
	  else
	    extra >>= 3;
	  break;
	}
    }
  if (i < len)
    {
      char *name;
      fprintf_filtered (stream, prefix);
      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, i), stream);
      if (extra)
	fprintf_filtered (stream, " + %d bytes", extra);
      if (bits)
	fprintf_filtered (stream, " (offset in bits)");
    }
  else
    fprintf_filtered (stream, "%d", val >> 3);
}

void
_initialize_cp_valprint ()
{
  add_show_from_set
    (add_set_cmd ("vtbl", class_support, var_boolean, (char *)&vtblprint,
		  "Set printing of C++ virtual function tables.",
		  &setprintlist),
     &showprintlist);

  add_show_from_set
    (add_set_cmd ("object", class_support, var_boolean, (char *)&objectprint,
	  "Set printing of object's derived type based on vtable info.",
		  &setprintlist),
     &showprintlist);

  /* Give people the defaults which they are used to.  */
  objectprint = 0;
  vtblprint = 0;
  obstack_begin (&dont_print_obstack, 32 * sizeof (struct type *));
}
Commit	Line	Data
a8a69e63 FF	1	/* Support for printing C++ values for GDB, the GNU debugger.
	2	Copyright 1986, 1988, 1989, 1991 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
	20	#include "defs.h"
	21	#include "obstack.h"
	22	#include "symtab.h"
	23	#include "gdbtypes.h"
	24	#include "expression.h"
	25	#include "value.h"
	26	#include "command.h"
	27	#include "gdbcmd.h"
	28
	29	int vtblprint; /* Controls printing of vtbl's */
	30	int objectprint; /* Controls looking up an object's derived type
	31	using what we find in its vtables. */
	32	struct obstack dont_print_obstack;
	33
	34	static void
	35	cplus_print_value PARAMS ((struct type , char , FILE *, int, int,
	36	enum val_prettyprint, struct type **));
	37
	38	/* BEGIN-FIXME: Hooks into typeprint.c, find a better home for prototypes. */
	39
	40	extern void
	41	c_type_print_base PARAMS ((struct type , FILE , int, int));
	42
	43	extern void
	44	c_type_print_varspec_prefix PARAMS ((struct type , FILE , int, int));
	45
	46	extern void
	47	cp_type_print_method_args PARAMS ((struct type *, char , char *, int,
	48	FILE *));
	49
	50	extern struct obstack dont_print_obstack;
	51
	52	/* END-FIXME */
	53
	54
	55	/* BEGIN-FIXME: Hooks into c-valprint.c */
	56
	57	extern int
	58	c_val_print PARAMS ((struct type , char , CORE_ADDR, FILE *, int, int, int,
	59	enum val_prettyprint));
	60	/* END-FIXME */
	61
	62
c7da3ed3 FF	63	void
	64	cp_print_class_method (valaddr, type, stream)
	65	char *valaddr;
	66	struct type *type;
	67	FILE *stream;
	68	{
	69	struct type *domain;
	70	struct fn_field *f;
	71	int j;
	72	int len2;
	73	int offset;
	74	char *kind = "";
	75	CORE_ADDR addr;
	76	struct symbol *sym;
	77	unsigned len;
	78	unsigned int i;
	79
	80	domain = TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type));
	81	addr = unpack_pointer (lookup_pointer_type (builtin_type_void), valaddr);
	82	if (METHOD_PTR_IS_VIRTUAL (addr))
	83	{
	84	offset = METHOD_PTR_TO_VOFFSET (addr);
	85	len = TYPE_NFN_FIELDS (domain);
	86	for (i = 0; i < len; i++)
	87	{
	88	f = TYPE_FN_FIELDLIST1 (domain, i);
	89	len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
	90
	91	for (j = 0; j < len2; j++)
	92	{
	93	QUIT;
	94	if (TYPE_FN_FIELD_VOFFSET (f, j) == offset)
	95	{
	96	kind = "virtual ";
	97	goto common;
	98	}
	99	}
	100	}
	101	}
	102	else
	103	{
	104	sym = find_pc_function (addr);
	105	if (sym == 0)
	106	{
	107	error ("invalid pointer to member function");
	108	}
	109	len = TYPE_NFN_FIELDS (domain);
	110	for (i = 0; i < len; i++)
	111	{
	112	f = TYPE_FN_FIELDLIST1 (domain, i);
	113	len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
	114
	115	for (j = 0; j < len2; j++)
	116	{
	117	QUIT;
	118	if (STREQ (SYMBOL_NAME (sym), TYPE_FN_FIELD_PHYSNAME (f, j)))
	119	{
	120	goto common;
	121	}
	122	}
	123	}
	124	}
	125	common:
	126	if (i < len)
127	{
128	fprintf_filtered (stream, "&");
129	c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f, j), stream, 0, 0);
130	fprintf (stream, kind);
131	if (TYPE_FN_FIELD_PHYSNAME (f, j)[0] == '_'
132	&& TYPE_FN_FIELD_PHYSNAME (f, j)[1] == CPLUS_MARKER)
133	{
134	cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j) + 1, "~",
135	TYPE_FN_FIELDLIST_NAME (domain, i),
136	0, stream);
137	}
138	else
139	{
140	cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j), "",
141	TYPE_FN_FIELDLIST_NAME (domain, i),
142	0, stream);
143	}
144	}
145	else
146	{
147	fprintf_filtered (stream, "(");
148	type_print (type, "", stream, -1);
149	fprintf_filtered (stream, ") %d", (int) addr >> 3);
150	}
151	}
152
a8a69e63 FF	153	/* Return truth value for assertion that TYPE is of the type
	154	"pointer to virtual function". */
	155
	156	int
	157	cp_is_vtbl_ptr_type(type)
	158	struct type *type;
	159	{
	160	char *typename = type_name_no_tag (type);
	161	static const char vtbl_ptr_name[] =
	162	{ CPLUS_MARKER,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
	163
2e4964ad	164	return (typename != NULL && STREQ(typename, vtbl_ptr_name));
a8a69e63 FF	165	}
	166
	167	/* Return truth value for the assertion that TYPE is of the type
	168	"pointer to virtual function table". */
	169
	170	int
	171	cp_is_vtbl_member(type)
	172	struct type *type;
	173	{
	174	if (TYPE_CODE (type) == TYPE_CODE_PTR)
	175	type = TYPE_TARGET_TYPE (type);
	176	else
	177	return 0;
	178
	179	if (TYPE_CODE (type) == TYPE_CODE_ARRAY
	180	&& TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT)
	181	/* Virtual functions tables are full of pointers to virtual functions. */
	182	return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type));
	183	return 0;
	184	}
	185
	186	/* Mutually recursive subroutines of cplus_print_value and c_val_print to
	187	print out a structure's fields: cp_print_value_fields and cplus_print_value.
	188
	189	TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
	190	same meanings as in cplus_print_value and c_val_print.
	191
	192	DONT_PRINT is an array of baseclass types that we
	193	should not print, or zero if called from top level. */
	194
	195	void
	196	cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
	197	dont_print)
	198	struct type *type;
	199	char *valaddr;
	200	FILE *stream;
	201	int format;
	202	int recurse;
	203	enum val_prettyprint pretty;
	204	struct type **dont_print;
	205	{
	206	int i, len, n_baseclasses;
	207
	208	check_stub_type (type);
	209
	210	fprintf_filtered (stream, "{");
	211	len = TYPE_NFIELDS (type);
	212	n_baseclasses = TYPE_N_BASECLASSES (type);
	213
	214	/* Print out baseclasses such that we don't print
	215	duplicates of virtual baseclasses. */
	216	if (n_baseclasses > 0)
	217	cplus_print_value (type, valaddr, stream, format, recurse+1, pretty,
	218	dont_print);
	219
	220	if (!len && n_baseclasses == 1)
	221	fprintf_filtered (stream, "<No data fields>");
	222	else
	223	{
	224	extern int inspect_it;
	225	int fields_seen = 0;
	226
	227	for (i = n_baseclasses; i < len; i++)
	228	{
229	/* Check if static field */
230	if (TYPE_FIELD_STATIC (type, i))
231	continue;
232	if (fields_seen)
233	fprintf_filtered (stream, ", ");
234	else if (n_baseclasses > 0)
235	{
236	if (pretty)
237	{
238	fprintf_filtered (stream, "\n");
239	print_spaces_filtered (2 + 2 * recurse, stream);
240	fputs_filtered ("members of ", stream);
241	fputs_filtered (type_name_no_tag (type), stream);
242	fputs_filtered (": ", stream);
243	}
244	}
245	fields_seen = 1;
246
247	if (pretty)
248	{
249	fprintf_filtered (stream, "\n");
250	print_spaces_filtered (2 + 2 * recurse, stream);
251	}
252	else
253	{
254	wrap_here (n_spaces (2 + 2 * recurse));
255	}
256	if (inspect_it)
257	{
258	if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
259	fputs_filtered ("\"( ptr \"", stream);
260	else
261	fputs_filtered ("\"( nodef \"", stream);
262	fprint_symbol (stream, TYPE_FIELD_NAME (type, i));
263	fputs_filtered ("\" \"", stream);
264	fprint_symbol (stream, TYPE_FIELD_NAME (type, i));
265	fputs_filtered ("\") \"", stream);
266	}
267	else
268	{
269	fprint_symbol (stream, TYPE_FIELD_NAME (type, i));
270	fputs_filtered (" = ", stream);
271	}
272	if (TYPE_FIELD_PACKED (type, i))
273	{
274	value v;
275
276	/* Bitfields require special handling, especially due to byte
277	order problems. */
278	v = value_from_longest (TYPE_FIELD_TYPE (type, i),
279	unpack_field_as_long (type, valaddr, i));
280
281	c_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
282	stream, format, 0, recurse + 1, pretty);
283	}
284	else
285	{
286	c_val_print (TYPE_FIELD_TYPE (type, i),
287	valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
288	0, stream, format, 0, recurse + 1, pretty);
289	}
290	}
291	if (pretty)
292	{
293	fprintf_filtered (stream, "\n");
294	print_spaces_filtered (2 * recurse, stream);
295	}
296	}
297	fprintf_filtered (stream, "}");
298	}
299
300	/* Special val_print routine to avoid printing multiple copies of virtual
301	baseclasses. */
302
303	static void
304	cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print)
305	struct type *type;
306	char *valaddr;
307	FILE *stream;
308	int format;
309	int recurse;
310	enum val_prettyprint pretty;
311	struct type **dont_print;
312	{
313	struct obstack tmp_obstack;
314	struct type **last_dont_print
315	= (struct type **)obstack_next_free (&dont_print_obstack);
316	int i, n_baseclasses = TYPE_N_BASECLASSES (type);
317
318	if (dont_print == 0)
319	{
320	/* If we're at top level, carve out a completely fresh
321	chunk of the obstack and use that until this particular
322	invocation returns. */
323	tmp_obstack = dont_print_obstack;
324	/* Bump up the high-water mark. Now alpha is omega. */
325	obstack_finish (&dont_print_obstack);
326	}
327
328	for (i = 0; i < n_baseclasses; i++)
329	{
330	char *baddr;
331	int err;
332
333	if (BASETYPE_VIA_VIRTUAL (type, i))
334	{
335	struct type **first_dont_print
336	= (struct type **)obstack_base (&dont_print_obstack);
337
338	int j = (struct type **)obstack_next_free (&dont_print_obstack)
339	- first_dont_print;
340
341	while (--j >= 0)
342	if (TYPE_BASECLASS (type, i) == first_dont_print[j])
343	goto flush_it;
344
345	obstack_ptr_grow (&dont_print_obstack, TYPE_BASECLASS (type, i));
346	}
347
348	/* Fix to use baseclass_offset instead. FIXME */
349	baddr = baseclass_addr (type, i, valaddr, 0, &err);
350	if (err == 0 && baddr == 0)
351	error ("could not find virtual baseclass `%s'\n",
352	type_name_no_tag (TYPE_BASECLASS (type, i)));
353
354	if (pretty)
355	{
356	fprintf_filtered (stream, "\n");
357	print_spaces_filtered (2 * recurse, stream);
358	}
359	fputs_filtered ("<", stream);
360	fputs_filtered (type_name_no_tag (TYPE_BASECLASS (type, i)), stream);
361	fputs_filtered ("> = ", stream);
362	if (err != 0)
363	fprintf_filtered (stream, "<invalid address 0x%x>", baddr);
364	else
365	cp_print_value_fields (TYPE_BASECLASS (type, i), baddr, stream, format,
366	recurse, pretty,
367	(struct type **) obstack_base (&dont_print_obstack));
368	fputs_filtered (", ", stream);
369
370	flush_it:
371	;
372	}
373
374	if (dont_print == 0)
375	{
376	/* Free the space used to deal with the printing
377	of this type from top level. */
378	obstack_free (&dont_print_obstack, last_dont_print);
379	/* Reset watermark so that we can continue protecting
380	ourselves from whatever we were protecting ourselves. */
381	dont_print_obstack = tmp_obstack;
382	}
383	}
384
385	void
386	cp_print_class_member (valaddr, domain, stream, prefix)
387	char *valaddr;
388	struct type *domain;
389	FILE *stream;
390	char *prefix;
391	{
392
393	/* VAL is a byte offset into the structure type DOMAIN.
394	Find the name of the field for that offset and
395	print it. */
396	int extra = 0;
397	int bits = 0;
398	register unsigned int i;
399	unsigned len = TYPE_NFIELDS (domain);
400	/* @@ Make VAL into bit offset */
401	LONGEST val = unpack_long (builtin_type_int, valaddr) << 3;
402	for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
403	{
404	int bitpos = TYPE_FIELD_BITPOS (domain, i);
405	QUIT;
406	if (val == bitpos)
407	break;
408	if (val < bitpos && i != 0)
409	{
410	/* Somehow pointing into a field. */
411	i -= 1;
412	extra = (val - TYPE_FIELD_BITPOS (domain, i));
413	if (extra & 0x7)
414	bits = 1;
415	else
416	extra >>= 3;
417	break;
418	}
419	}
420	if (i < len)
421	{
422	char *name;
423	fprintf_filtered (stream, prefix);
424	name = type_name_no_tag (domain);
425	if (name)
426	fputs_filtered (name, stream);
427	else
428	c_type_print_base (domain, stream, 0, 0);
429	fprintf_filtered (stream, "::");
430	fputs_filtered (TYPE_FIELD_NAME (domain, i), stream);
431	if (extra)
432	fprintf_filtered (stream, " + %d bytes", extra);
433	if (bits)
434	fprintf_filtered (stream, " (offset in bits)");
435	}
436	else
437	fprintf_filtered (stream, "%d", val >> 3);
438	}
439
440	void
441	_initialize_cp_valprint ()
442	{
443	add_show_from_set
444	(add_set_cmd ("vtbl", class_support, var_boolean, (char *)&vtblprint,
445	"Set printing of C++ virtual function tables.",
446	&setprintlist),
447	&showprintlist);
448
449	add_show_from_set
450	(add_set_cmd ("object", class_support, var_boolean, (char *)&objectprint,
451	"Set printing of object's derived type based on vtable info.",
452	&setprintlist),
453	&showprintlist);
454
455	/* Give people the defaults which they are used to. */
456	objectprint = 0;
457	vtblprint = 0;
458	obstack_begin (&dont_print_obstack, 32 * sizeof (struct type *));
459	}