gdb/c-valprint.c - native_client/nacl-gdb - Git at Google

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

    Copyright (C) 1986, 1988-1989, 1991-2001, 2003, 2005-2012 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_string.h"
 #include "symtab.h"
 #include "gdbtypes.h"
 #include "expression.h"
 #include "value.h"
 #include "valprint.h"
 #include "language.h"
 #include "c-lang.h"
 #include "cp-abi.h"
 #include "target.h"


 /* Print function pointer with inferior address ADDRESS onto stdio
    stream STREAM.  */

 static void
 print_function_pointer_address (struct gdbarch *gdbarch,
 				CORE_ADDR address,
 				struct ui_file *stream,
 				int addressprint)
 {
   CORE_ADDR func_addr
     = gdbarch_convert_from_func_ptr_addr (gdbarch, address,
 					  &current_target);

   /* If the function pointer is represented by a description, print
      the address of the description.  */
   if (addressprint && func_addr != address)
     {
       fputs_filtered ("@", stream);
       fputs_filtered (paddress (gdbarch, address), stream);
       fputs_filtered (": ", stream);
     }
   print_address_demangle (gdbarch, func_addr, stream, demangle);
 }


 /* A helper for c_textual_element_type.  This checks the name of the
    typedef.  This is bogus but it isn't apparent that the compiler
    provides us the help we may need.  */

 static int
 textual_name (const char *name)
 {
   return (!strcmp (name, "wchar_t")
 	  || !strcmp (name, "char16_t")
 	  || !strcmp (name, "char32_t"));
 }

 /* Apply a heuristic to decide whether an array of TYPE or a pointer
    to TYPE should be printed as a textual string.  Return non-zero if
    it should, or zero if it should be treated as an array of integers
    or pointer to integers.  FORMAT is the current format letter, or 0
    if none.

    We guess that "char" is a character.  Explicitly signed and
    unsigned character types are also characters.  Integer data from
    vector types is not.  The user can override this by using the /s
    format letter.  */

 int
 c_textual_element_type (struct type *type, char format)
 {
   struct type *true_type, *iter_type;

   if (format != 0 && format != 's')
     return 0;

   /* We also rely on this for its side effect of setting up all the
      typedef pointers.  */
   true_type = check_typedef (type);

   /* TYPE_CODE_CHAR is always textual.  */
   if (TYPE_CODE (true_type) == TYPE_CODE_CHAR)
     return 1;

   /* Any other character-like types must be integral.  */
   if (TYPE_CODE (true_type) != TYPE_CODE_INT)
     return 0;

   /* We peel typedefs one by one, looking for a match.  */
   iter_type = type;
   while (iter_type)
     {
       /* Check the name of the type.  */
       if (TYPE_NAME (iter_type) && textual_name (TYPE_NAME (iter_type)))
 	return 1;

       if (TYPE_CODE (iter_type) != TYPE_CODE_TYPEDEF)
 	break;

       /* Peel a single typedef.  If the typedef doesn't have a target
 	 type, we use check_typedef and hope the result is ok -- it
 	 might be for C++, where wchar_t is a built-in type.  */
       if (TYPE_TARGET_TYPE (iter_type))
 	iter_type = TYPE_TARGET_TYPE (iter_type);
       else
 	iter_type = check_typedef (iter_type);
     }

   if (format == 's')
     {
       /* Print this as a string if we can manage it.  For now, no wide
 	 character support.  */
       if (TYPE_CODE (true_type) == TYPE_CODE_INT
 	  && TYPE_LENGTH (true_type) == 1)
 	return 1;
     }
   else
     {
       /* If a one-byte TYPE_CODE_INT is missing the not-a-character
 	 flag, then we treat it as text; otherwise, we assume it's
 	 being used as data.  */
       if (TYPE_CODE (true_type) == TYPE_CODE_INT
 	  && TYPE_LENGTH (true_type) == 1
 	  && !TYPE_NOTTEXT (true_type))
 	return 1;
     }

   return 0;
 }

 /* See val_print for a description of the various parameters of this
    function; they are identical.  The semantics of the return value is
    also identical to val_print.  */

 int
 c_val_print (struct type *type, const gdb_byte *valaddr,
 	     int embedded_offset, CORE_ADDR address,
 	     struct ui_file *stream, int recurse,
 	     const struct value *original_value,
 	     const struct value_print_options *options)
 {
   struct gdbarch *gdbarch = get_type_arch (type);
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   unsigned int i = 0;	/* Number of characters printed.  */
   unsigned len;
   struct type *elttype, *unresolved_elttype;
   struct type *unresolved_type = type;
   unsigned eltlen;
   LONGEST val;
   CORE_ADDR addr;

   CHECK_TYPEDEF (type);
   switch (TYPE_CODE (type))
     {
     case TYPE_CODE_ARRAY:
       unresolved_elttype = TYPE_TARGET_TYPE (type);
       elttype = check_typedef (unresolved_elttype);
       if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (unresolved_elttype) > 0)
 	{
           LONGEST low_bound, high_bound;

           if (!get_array_bounds (type, &low_bound, &high_bound))
             error (_("Could not determine the array high bound"));

 	  eltlen = TYPE_LENGTH (elttype);
 	  len = high_bound - low_bound + 1;
 	  if (options->prettyprint_arrays)
 	    {
 	      print_spaces_filtered (2 + 2 * recurse, stream);
 	    }

 	  /* Print arrays of textual chars with a string syntax, as
 	     long as the entire array is valid.  */
           if (c_textual_element_type (unresolved_elttype,
 				      options->format)
 	      && value_bytes_available (original_value, embedded_offset,
 					TYPE_LENGTH (type))
 	      && value_bits_valid (original_value,
 				   TARGET_CHAR_BIT * embedded_offset,
 				   TARGET_CHAR_BIT * TYPE_LENGTH (type)))
 	    {
 	      /* If requested, look for the first null char and only
 	         print elements up to it.  */
 	      if (options->stop_print_at_null)
 		{
 		  unsigned int temp_len;

 		  for (temp_len = 0;
 		       (temp_len < len
 			&& temp_len < options->print_max
 			&& extract_unsigned_integer (valaddr + embedded_offset
 						     + temp_len * eltlen,
 						     eltlen, byte_order) != 0);
 		       ++temp_len)
 		    ;
 		  len = temp_len;
 		}

 	      LA_PRINT_STRING (stream, unresolved_elttype,
 			       valaddr + embedded_offset, len,
 			       NULL, 0, options);
 	      i = len;
 	    }
 	  else
 	    {
 	      fprintf_filtered (stream, "{");
 	      /* If this is a virtual function table, print the 0th
 	         entry specially, and the rest of the members
 	         normally.  */
 	      if (cp_is_vtbl_ptr_type (elttype))
 		{
 		  i = 1;
 		  fprintf_filtered (stream, _("%d vtable entries"),
 				    len - 1);
 		}
 	      else
 		{
 		  i = 0;
 		}
 	      val_print_array_elements (type, valaddr, embedded_offset,
 					address, stream,
 					recurse, original_value, options, i);
 	      fprintf_filtered (stream, "}");
 	    }
 	  break;
 	}
       /* Array of unspecified length: treat like pointer to first
 	 elt.  */
       addr = address + embedded_offset;
       goto print_unpacked_pointer;

     case TYPE_CODE_MEMBERPTR:
       if (options->format)
 	{
 	  val_print_scalar_formatted (type, valaddr, embedded_offset,
 				      original_value, options, 0, stream);
 	  break;
 	}
       cp_print_class_member (valaddr + embedded_offset, type, stream, "&");
       break;

     case TYPE_CODE_METHODPTR:
       cplus_print_method_ptr (valaddr + embedded_offset, type, stream);
       break;

     case TYPE_CODE_PTR:
       if (options->format && options->format != 's')
 	{
 	  val_print_scalar_formatted (type, valaddr, embedded_offset,
 				      original_value, options, 0, stream);
 	  break;
 	}
       if (options->vtblprint && cp_is_vtbl_ptr_type (type))
 	{
 	  /* Print the unmangled name if desired.  */
 	  /* Print vtable entry - we only get here if we ARE using
 	     -fvtable_thunks.  (Otherwise, look under
 	     TYPE_CODE_STRUCT.)  */
 	  CORE_ADDR addr
 	    = extract_typed_address (valaddr + embedded_offset, type);

 	  print_function_pointer_address (gdbarch, addr, stream,
 					  options->addressprint);
 	  break;
 	}
       unresolved_elttype = TYPE_TARGET_TYPE (type);
       elttype = check_typedef (unresolved_elttype);
 	{
 	  addr = unpack_pointer (type, valaddr + embedded_offset);
 	print_unpacked_pointer:

 	  if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
 	    {
 	      /* Try to print what function it points to.  */
 	      print_function_pointer_address (gdbarch, addr, stream,
 					      options->addressprint);
 	      /* Return value is irrelevant except for string
 		 pointers.  */
 	      return (0);
 	    }

 	  if (options->addressprint)
 	    fputs_filtered (paddress (gdbarch, addr), stream);

 	  /* For a pointer to a textual type, also print the string
 	     pointed to, unless pointer is null.  */

 	  if (c_textual_element_type (unresolved_elttype,
 				      options->format)
 	      && addr != 0)
 	    {
 	      i = val_print_string (unresolved_elttype, NULL,
 				    addr, -1,
 				    stream, options);
 	    }
 	  else if (cp_is_vtbl_member (type))
 	    {
 	      /* Print vtbl's nicely.  */
 	      CORE_ADDR vt_address = unpack_pointer (type,
 						     valaddr
 						     + embedded_offset);

 	      struct minimal_symbol *msymbol =
 	      lookup_minimal_symbol_by_pc (vt_address);
 	      if ((msymbol != NULL)
 		  && (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
 		{
 		  fputs_filtered (" <", stream);
 		  fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream);
 		  fputs_filtered (">", stream);
 		}
 	      if (vt_address && options->vtblprint)
 		{
 		  struct value *vt_val;
 		  struct symbol *wsym = (struct symbol *) NULL;
 		  struct type *wtype;
 		  struct block *block = (struct block *) NULL;
 		  int is_this_fld;

 		  if (msymbol != NULL)
 		    wsym = lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol),
 					  block, VAR_DOMAIN,
 					  &is_this_fld);

 		  if (wsym)
 		    {
 		      wtype = SYMBOL_TYPE (wsym);
 		    }
 		  else
 		    {
 		      wtype = unresolved_elttype;
 		    }
 		  vt_val = value_at (wtype, vt_address);
 		  common_val_print (vt_val, stream, recurse + 1,
 				    options, current_language);
 		  if (options->pretty)
 		    {
 		      fprintf_filtered (stream, "\n");
 		      print_spaces_filtered (2 + 2 * recurse, stream);
 		    }
 		}
 	    }

 	  /* Return number of characters printed, including the
 	     terminating '\0' if we reached the end.  val_print_string
 	     takes care including the terminating '\0' if
 	     necessary.  */
 	  return i;
 	}
       break;

     case TYPE_CODE_REF:
       elttype = check_typedef (TYPE_TARGET_TYPE (type));
       if (options->addressprint)
 	{
 	  CORE_ADDR addr
 	    = extract_typed_address (valaddr + embedded_offset, type);

 	  fprintf_filtered (stream, "@");
 	  fputs_filtered (paddress (gdbarch, addr), stream);
 	  if (options->deref_ref)
 	    fputs_filtered (": ", stream);
 	}
       /* De-reference the reference.  */
       if (options->deref_ref)
 	{
 	  if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
 	    {
 	      struct value *deref_val;

 	      deref_val = coerce_ref_if_computed (original_value);
 	      if (deref_val != NULL)
 		{
 		  /* More complicated computed references are not supported.  */
 		  gdb_assert (embedded_offset == 0);
 		}
 	      else
 		deref_val = value_at (TYPE_TARGET_TYPE (type),
 				      unpack_pointer (type,
 						      (valaddr
 						       + embedded_offset)));

 	      common_val_print (deref_val, stream, recurse, options,
 				current_language);
 	    }
 	  else
 	    fputs_filtered ("???", stream);
 	}
       break;

     case TYPE_CODE_UNION:
       if (recurse && !options->unionprint)
 	{
 	  fprintf_filtered (stream, "{...}");
 	  break;
 	}
       /* Fall through.  */
     case TYPE_CODE_STRUCT:
       /*FIXME: Abstract this away.  */
       if (options->vtblprint && cp_is_vtbl_ptr_type (type))
 	{
 	  /* Print the unmangled name if desired.  */
 	  /* Print vtable entry - we only get here if NOT using
 	     -fvtable_thunks.  (Otherwise, look under
 	     TYPE_CODE_PTR.)  */
 	  int offset = (embedded_offset
 			+ TYPE_FIELD_BITPOS (type,
 					     VTBL_FNADDR_OFFSET) / 8);
 	  struct type *field_type = TYPE_FIELD_TYPE (type,
 						     VTBL_FNADDR_OFFSET);
 	  CORE_ADDR addr
 	    = extract_typed_address (valaddr + offset, field_type);

 	  print_function_pointer_address (gdbarch, addr, stream,
 					  options->addressprint);
 	}
       else
 	cp_print_value_fields_rtti (type, valaddr,
 				    embedded_offset, address,
 				    stream, recurse,
 				    original_value, options,
 				    NULL, 0);
       break;

     case TYPE_CODE_ENUM:
       if (options->format)
 	{
 	  val_print_scalar_formatted (type, valaddr, embedded_offset,
 				      original_value, options, 0, stream);
 	  break;
 	}
       len = TYPE_NFIELDS (type);
       val = unpack_long (type, valaddr + embedded_offset);
       for (i = 0; i < len; i++)
 	{
 	  QUIT;
 	  if (val == TYPE_FIELD_BITPOS (type, i))
 	    {
 	      break;
 	    }
 	}
       if (i < len)
 	{
 	  fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
 	}
       else
 	{
 	  print_longest (stream, 'd', 0, val);
 	}
       break;

     case TYPE_CODE_FLAGS:
       if (options->format)
 	val_print_scalar_formatted (type, valaddr, embedded_offset,
 				    original_value, options, 0, stream);
       else
 	val_print_type_code_flags (type, valaddr + embedded_offset,
 				   stream);
       break;

     case TYPE_CODE_FUNC:
     case TYPE_CODE_METHOD:
       if (options->format)
 	{
 	  val_print_scalar_formatted (type, valaddr, embedded_offset,
 				      original_value, options, 0, stream);
 	  break;
 	}
       /* FIXME, we should consider, at least for ANSI C language,
          eliminating the distinction made between FUNCs and POINTERs
          to FUNCs.  */
       fprintf_filtered (stream, "{");
       type_print (type, "", stream, -1);
       fprintf_filtered (stream, "} ");
       /* Try to print what function it points to, and its address.  */
       print_address_demangle (gdbarch, address, stream, demangle);
       break;

     case TYPE_CODE_BOOL:
       if (options->format || options->output_format)
 	{
 	  struct value_print_options opts = *options;
 	  opts.format = (options->format ? options->format
 			 : options->output_format);
 	  val_print_scalar_formatted (type, valaddr, embedded_offset,
 				      original_value, &opts, 0, stream);
 	}
       else
 	{
 	  val = unpack_long (type, valaddr + embedded_offset);
 	  if (val == 0)
 	    fputs_filtered ("false", stream);
 	  else if (val == 1)
 	    fputs_filtered ("true", stream);
 	  else
 	    print_longest (stream, 'd', 0, val);
 	}
       break;

     case TYPE_CODE_RANGE:
       /* FIXME: create_range_type does not set the unsigned bit in a
          range type (I think it probably should copy it from the
          target type), so we won't print values which are too large to
          fit in a signed integer correctly.  */
       /* FIXME: Doesn't handle ranges of enums correctly.  (Can't just
          print with the target type, though, because the size of our
          type and the target type might differ).  */
       /* FALLTHROUGH */

     case TYPE_CODE_INT:
       if (options->format || options->output_format)
 	{
 	  struct value_print_options opts = *options;

 	  opts.format = (options->format ? options->format
 			 : options->output_format);
 	  val_print_scalar_formatted (type, valaddr, embedded_offset,
 				      original_value, &opts, 0, stream);
 	}
       else
 	{
 	  val_print_type_code_int (type, valaddr + embedded_offset,
 				   stream);
 	  /* C and C++ has no single byte int type, char is used
 	     instead.  Since we don't know whether the value is really
 	     intended to be used as an integer or a character, print
 	     the character equivalent as well.  */
 	  if (c_textual_element_type (unresolved_type, options->format))
 	    {
 	      fputs_filtered (" ", stream);
 	      LA_PRINT_CHAR (unpack_long (type, valaddr + embedded_offset),
 			     unresolved_type, stream);
 	    }
 	}
       break;

     case TYPE_CODE_CHAR:
       if (options->format || options->output_format)
 	{
 	  struct value_print_options opts = *options;
 	  opts.format = (options->format ? options->format
 			 : options->output_format);
 	  val_print_scalar_formatted (type, valaddr, embedded_offset,
 				      original_value, &opts, 0, stream);
 	}
       else
 	{
 	  val = unpack_long (type, valaddr + embedded_offset);
 	  if (TYPE_UNSIGNED (type))
 	    fprintf_filtered (stream, "%u", (unsigned int) val);
 	  else
 	    fprintf_filtered (stream, "%d", (int) val);
 	  fputs_filtered (" ", stream);
 	  LA_PRINT_CHAR (val, unresolved_type, stream);
 	}
       break;

     case TYPE_CODE_FLT:
       if (options->format)
 	{
 	  val_print_scalar_formatted (type, valaddr, embedded_offset,
 				      original_value, options, 0, stream);
 	}
       else
 	{
 	  print_floating (valaddr + embedded_offset, type, stream);
 	}
       break;

     case TYPE_CODE_DECFLOAT:
       if (options->format)
 	val_print_scalar_formatted (type, valaddr, embedded_offset,
 				    original_value, options, 0, stream);
       else
 	print_decimal_floating (valaddr + embedded_offset,
 				type, stream);
       break;

     case TYPE_CODE_VOID:
       fprintf_filtered (stream, "void");
       break;

     case TYPE_CODE_ERROR:
       fprintf_filtered (stream, "%s", TYPE_ERROR_NAME (type));
       break;

     case TYPE_CODE_UNDEF:
       /* This happens (without TYPE_FLAG_STUB set) on systems which
          don't use dbx xrefs (NO_DBX_XREFS in gcc) if a file has a
          "struct foo *bar" and no complete type for struct foo in that
          file.  */
       fprintf_filtered (stream, _("<incomplete type>"));
       break;

     case TYPE_CODE_COMPLEX:
       if (options->format)
 	val_print_scalar_formatted (TYPE_TARGET_TYPE (type),
 				    valaddr, embedded_offset,
 				    original_value, options, 0, stream);
       else
 	print_floating (valaddr + embedded_offset,
 			TYPE_TARGET_TYPE (type),
 			stream);
       fprintf_filtered (stream, " + ");
       if (options->format)
 	val_print_scalar_formatted (TYPE_TARGET_TYPE (type),
 				    valaddr,
 				    embedded_offset
 				    + TYPE_LENGTH (TYPE_TARGET_TYPE (type)),
 				    original_value,
 				    options, 0, stream);
       else
 	print_floating (valaddr + embedded_offset
 			+ TYPE_LENGTH (TYPE_TARGET_TYPE (type)),
 			TYPE_TARGET_TYPE (type),
 			stream);
       fprintf_filtered (stream, " * I");
       break;

     default:
       error (_("Invalid C/C++ type code %d in symbol table."),
 	     TYPE_CODE (type));
     }
   gdb_flush (stream);
   return (0);
 }

 int
 c_value_print (struct value *val, struct ui_file *stream,
 	       const struct value_print_options *options)
 {
   struct type *type, *real_type, *val_type;
   int full, top, using_enc;
   struct value_print_options opts = *options;

   opts.deref_ref = 1;

   /* If it is a pointer, indicate what it points to.

      Print type also if it is a reference.

      C++: if it is a member pointer, we will take care
      of that when we print it.  */

   /* Preserve the original type before stripping typedefs.  We prefer
      to pass down the original type when possible, but for local
      checks it is better to look past the typedefs.  */
   val_type = value_type (val);
   type = check_typedef (val_type);

   if (TYPE_CODE (type) == TYPE_CODE_PTR
       || TYPE_CODE (type) == TYPE_CODE_REF)
     {
       /* Hack:  remove (char *) for char strings.  Their
          type is indicated by the quoted string anyway.
          (Don't use c_textual_element_type here; quoted strings
          are always exactly (char *), (wchar_t *), or the like.  */
       if (TYPE_CODE (val_type) == TYPE_CODE_PTR
 	  && TYPE_NAME (val_type) == NULL
 	  && TYPE_NAME (TYPE_TARGET_TYPE (val_type)) != NULL
 	  && (strcmp (TYPE_NAME (TYPE_TARGET_TYPE (val_type)),
 		      "char") == 0
 	      || textual_name (TYPE_NAME (TYPE_TARGET_TYPE (val_type)))))
 	{
 	  /* Print nothing.  */
 	}
       else if (options->objectprint
 	       && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
 	{

 	  if (TYPE_CODE(type) == TYPE_CODE_REF)
 	    {
 	      /* Copy value, change to pointer, so we don't get an
 	         error about a non-pointer type in
 	         value_rtti_target_type.  */
 	      struct value *temparg;
 	      temparg=value_copy(val);
 	      deprecated_set_value_type
 		(temparg, lookup_pointer_type (TYPE_TARGET_TYPE (type)));
 	      val = temparg;
 	    }
 	  /* Pointer to class, check real type of object.  */
 	  fprintf_filtered (stream, "(");

 	  if (value_entirely_available (val))
  	    {
 	      real_type = value_rtti_target_type (val, &full, &top, &using_enc);
 	      if (real_type)
 		{
 		  /* RTTI entry found.  */
 		  if (TYPE_CODE (type) == TYPE_CODE_PTR)
 		    {
 		      /* Create a pointer type pointing to the real
 			 type.  */
 		      type = lookup_pointer_type (real_type);
 		    }
 		  else
 		    {
 		      /* Create a reference type referencing the real
 			 type.  */
 		      type = lookup_reference_type (real_type);
 		    }
 		  /* Need to adjust pointer value.  */
 		  val = value_from_pointer (type, value_as_address (val) - top);

 		  /* Note: When we look up RTTI entries, we don't get
 		     any information on const or volatile
 		     attributes.  */
 		}
 	    }
           type_print (type, "", stream, -1);
 	  fprintf_filtered (stream, ") ");
 	  val_type = type;
 	}
       else
 	{
 	  /* normal case */
 	  fprintf_filtered (stream, "(");
 	  type_print (value_type (val), "", stream, -1);
 	  fprintf_filtered (stream, ") ");
 	}
     }

   if (!value_initialized (val))
     fprintf_filtered (stream, " [uninitialized] ");

   if (options->objectprint && (TYPE_CODE (type) == TYPE_CODE_CLASS))
     {
       /* Attempt to determine real type of object.  */
       real_type = value_rtti_type (val, &full, &top, &using_enc);
       if (real_type)
 	{
 	  /* We have RTTI information, so use it.  */
 	  val = value_full_object (val, real_type,
 				   full, top, using_enc);
 	  fprintf_filtered (stream, "(%s%s) ",
 			    TYPE_NAME (real_type),
 			    full ? "" : _(" [incomplete object]"));
 	  /* Print out object: enclosing type is same as real_type if
 	     full.  */
 	  return val_print (value_enclosing_type (val),
 			    value_contents_for_printing (val), 0,
 			    value_address (val), stream, 0,
 			    val, &opts, current_language);
           /* Note: When we look up RTTI entries, we don't get any
              information on const or volatile attributes.  */
 	}
       else if (type != check_typedef (value_enclosing_type (val)))
 	{
 	  /* No RTTI information, so let's do our best.  */
 	  fprintf_filtered (stream, "(%s ?) ",
 			    TYPE_NAME (value_enclosing_type (val)));
 	  return val_print (value_enclosing_type (val),
 			    value_contents_for_printing (val), 0,
 			    value_address (val), stream, 0,
 			    val, &opts, current_language);
 	}
       /* Otherwise, we end up at the return outside this "if".  */
     }

   return val_print (val_type, value_contents_for_printing (val),
 		    value_embedded_offset (val),
 		    value_address (val),
 		    stream, 0,
 		    val, &opts, current_language);
 }
	/* Support for printing C values for GDB, the GNU debugger.

	Copyright (C) 1986, 1988-1989, 1991-2001, 2003, 2005-2012 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_string.h"
	#include "symtab.h"
	#include "gdbtypes.h"
	#include "expression.h"
	#include "value.h"
	#include "valprint.h"
	#include "language.h"
	#include "c-lang.h"
	#include "cp-abi.h"
	#include "target.h"


	/* Print function pointer with inferior address ADDRESS onto stdio
	stream STREAM. */

	static void
	print_function_pointer_address (struct gdbarch *gdbarch,
	CORE_ADDR address,
	struct ui_file *stream,
	int addressprint)
	{
	CORE_ADDR func_addr
	= gdbarch_convert_from_func_ptr_addr (gdbarch, address,
	&current_target);

	/* If the function pointer is represented by a description, print
	the address of the description. */
	if (addressprint && func_addr != address)
	{
	fputs_filtered ("@", stream);
	fputs_filtered (paddress (gdbarch, address), stream);
	fputs_filtered (": ", stream);
	}
	print_address_demangle (gdbarch, func_addr, stream, demangle);
	}


	/* A helper for c_textual_element_type. This checks the name of the
	typedef. This is bogus but it isn't apparent that the compiler
	provides us the help we may need. */

	static int
	textual_name (const char *name)
	{
	return (!strcmp (name, "wchar_t")
	\|\| !strcmp (name, "char16_t")
	\|\| !strcmp (name, "char32_t"));
	}

	/* Apply a heuristic to decide whether an array of TYPE or a pointer
	to TYPE should be printed as a textual string. Return non-zero if
	it should, or zero if it should be treated as an array of integers
	or pointer to integers. FORMAT is the current format letter, or 0
	if none.

	We guess that "char" is a character. Explicitly signed and
	unsigned character types are also characters. Integer data from
	vector types is not. The user can override this by using the /s
	format letter. */

	int
	c_textual_element_type (struct type *type, char format)
	{
	struct type true_type, iter_type;

	if (format != 0 && format != 's')
	return 0;

	/* We also rely on this for its side effect of setting up all the
	typedef pointers. */
	true_type = check_typedef (type);

	/* TYPE_CODE_CHAR is always textual. */
	if (TYPE_CODE (true_type) == TYPE_CODE_CHAR)
	return 1;

	/* Any other character-like types must be integral. */
	if (TYPE_CODE (true_type) != TYPE_CODE_INT)
	return 0;

	/* We peel typedefs one by one, looking for a match. */
	iter_type = type;
	while (iter_type)
	{
	/* Check the name of the type. */
	if (TYPE_NAME (iter_type) && textual_name (TYPE_NAME (iter_type)))
	return 1;

	if (TYPE_CODE (iter_type) != TYPE_CODE_TYPEDEF)
	break;

	/* Peel a single typedef. If the typedef doesn't have a target
	type, we use check_typedef and hope the result is ok -- it
	might be for C++, where wchar_t is a built-in type. */
	if (TYPE_TARGET_TYPE (iter_type))
	iter_type = TYPE_TARGET_TYPE (iter_type);
	else
	iter_type = check_typedef (iter_type);
	}

	if (format == 's')
	{
	/* Print this as a string if we can manage it. For now, no wide
	character support. */
	if (TYPE_CODE (true_type) == TYPE_CODE_INT
	&& TYPE_LENGTH (true_type) == 1)
	return 1;
	}
	else
	{
	/* If a one-byte TYPE_CODE_INT is missing the not-a-character
	flag, then we treat it as text; otherwise, we assume it's
	being used as data. */
	if (TYPE_CODE (true_type) == TYPE_CODE_INT
	&& TYPE_LENGTH (true_type) == 1
	&& !TYPE_NOTTEXT (true_type))
	return 1;
	}

	return 0;
	}

	/* See val_print for a description of the various parameters of this
	function; they are identical. The semantics of the return value is
	also identical to val_print. */

	int
	c_val_print (struct type type, const gdb_byte valaddr,
	int embedded_offset, CORE_ADDR address,
	struct ui_file *stream, int recurse,
	const struct value *original_value,
	const struct value_print_options *options)
	{
	struct gdbarch *gdbarch = get_type_arch (type);
	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
	unsigned int i = 0; /* Number of characters printed. */
	unsigned len;
	struct type elttype, unresolved_elttype;
	struct type *unresolved_type = type;
	unsigned eltlen;
	LONGEST val;
	CORE_ADDR addr;

	CHECK_TYPEDEF (type);
	switch (TYPE_CODE (type))
	{
	case TYPE_CODE_ARRAY:
	unresolved_elttype = TYPE_TARGET_TYPE (type);
	elttype = check_typedef (unresolved_elttype);
	if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (unresolved_elttype) > 0)
	{
	LONGEST low_bound, high_bound;

	if (!get_array_bounds (type, &low_bound, &high_bound))
	error (_("Could not determine the array high bound"));

	eltlen = TYPE_LENGTH (elttype);
	len = high_bound - low_bound + 1;
	if (options->prettyprint_arrays)
	{
	print_spaces_filtered (2 + 2 * recurse, stream);
	}

	/* Print arrays of textual chars with a string syntax, as
	long as the entire array is valid. */
	if (c_textual_element_type (unresolved_elttype,
	options->format)
	&& value_bytes_available (original_value, embedded_offset,
	TYPE_LENGTH (type))
	&& value_bits_valid (original_value,
	TARGET_CHAR_BIT * embedded_offset,
	TARGET_CHAR_BIT * TYPE_LENGTH (type)))
	{
	/* If requested, look for the first null char and only
	print elements up to it. */
	if (options->stop_print_at_null)
	{
	unsigned int temp_len;

	for (temp_len = 0;
	(temp_len < len
	&& temp_len < options->print_max
	&& extract_unsigned_integer (valaddr + embedded_offset
	+ temp_len * eltlen,
	eltlen, byte_order) != 0);
	++temp_len)
	;
	len = temp_len;
	}

	LA_PRINT_STRING (stream, unresolved_elttype,
	valaddr + embedded_offset, len,
	NULL, 0, options);
	i = len;
	}
	else
	{
	fprintf_filtered (stream, "{");
	/* If this is a virtual function table, print the 0th
	entry specially, and the rest of the members
	normally. */
	if (cp_is_vtbl_ptr_type (elttype))
	{
	i = 1;
	fprintf_filtered (stream, _("%d vtable entries"),
	len - 1);
	}
	else
	{
	i = 0;
	}
	val_print_array_elements (type, valaddr, embedded_offset,
	address, stream,
	recurse, original_value, options, i);
	fprintf_filtered (stream, "}");
	}
	break;
	}
	/* Array of unspecified length: treat like pointer to first
	elt. */
	addr = address + embedded_offset;
	goto print_unpacked_pointer;

	case TYPE_CODE_MEMBERPTR:
	if (options->format)
	{
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, options, 0, stream);
	break;
	}
	cp_print_class_member (valaddr + embedded_offset, type, stream, "&");
	break;

	case TYPE_CODE_METHODPTR:
	cplus_print_method_ptr (valaddr + embedded_offset, type, stream);
	break;

	case TYPE_CODE_PTR:
	if (options->format && options->format != 's')
	{
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, options, 0, stream);
	break;
	}
	if (options->vtblprint && cp_is_vtbl_ptr_type (type))
	{
	/* Print the unmangled name if desired. */
	/* Print vtable entry - we only get here if we ARE using
	-fvtable_thunks. (Otherwise, look under
	TYPE_CODE_STRUCT.) */
	CORE_ADDR addr
	= extract_typed_address (valaddr + embedded_offset, type);

	print_function_pointer_address (gdbarch, addr, stream,
	options->addressprint);
	break;
	}
	unresolved_elttype = TYPE_TARGET_TYPE (type);
	elttype = check_typedef (unresolved_elttype);
	{
	addr = unpack_pointer (type, valaddr + embedded_offset);
	print_unpacked_pointer:

	if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
	{
	/* Try to print what function it points to. */
	print_function_pointer_address (gdbarch, addr, stream,
	options->addressprint);
	/* Return value is irrelevant except for string
	pointers. */
	return (0);
	}

	if (options->addressprint)
	fputs_filtered (paddress (gdbarch, addr), stream);

	/* For a pointer to a textual type, also print the string
	pointed to, unless pointer is null. */

	if (c_textual_element_type (unresolved_elttype,
	options->format)
	&& addr != 0)
	{
	i = val_print_string (unresolved_elttype, NULL,
	addr, -1,
	stream, options);
	}
	else if (cp_is_vtbl_member (type))
	{
	/* Print vtbl's nicely. */
	CORE_ADDR vt_address = unpack_pointer (type,
	valaddr
	+ embedded_offset);

	struct minimal_symbol *msymbol =
	lookup_minimal_symbol_by_pc (vt_address);
	if ((msymbol != NULL)
	&& (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
	{
	fputs_filtered (" <", stream);
	fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream);
	fputs_filtered (">", stream);
	}
	if (vt_address && options->vtblprint)
	{
	struct value *vt_val;
	struct symbol wsym = (struct symbol ) NULL;
	struct type *wtype;
	struct block block = (struct block ) NULL;
	int is_this_fld;

	if (msymbol != NULL)
	wsym = lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol),
	block, VAR_DOMAIN,
	&is_this_fld);

	if (wsym)
	{
	wtype = SYMBOL_TYPE (wsym);
	}
	else
	{
	wtype = unresolved_elttype;
	}
	vt_val = value_at (wtype, vt_address);
	common_val_print (vt_val, stream, recurse + 1,
	options, current_language);
	if (options->pretty)
	{
	fprintf_filtered (stream, "\n");
	print_spaces_filtered (2 + 2 * recurse, stream);
	}
	}
	}

	/* Return number of characters printed, including the
	terminating '\0' if we reached the end. val_print_string
	takes care including the terminating '\0' if
	necessary. */
	return i;
	}
	break;

	case TYPE_CODE_REF:
	elttype = check_typedef (TYPE_TARGET_TYPE (type));
	if (options->addressprint)
	{
	CORE_ADDR addr
	= extract_typed_address (valaddr + embedded_offset, type);

	fprintf_filtered (stream, "@");
	fputs_filtered (paddress (gdbarch, addr), stream);
	if (options->deref_ref)
	fputs_filtered (": ", stream);
	}
	/* De-reference the reference. */
	if (options->deref_ref)
	{
	if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
	{
	struct value *deref_val;

	deref_val = coerce_ref_if_computed (original_value);
	if (deref_val != NULL)
	{
	/* More complicated computed references are not supported. */
	gdb_assert (embedded_offset == 0);
	}
	else
	deref_val = value_at (TYPE_TARGET_TYPE (type),
	unpack_pointer (type,
	(valaddr
	+ embedded_offset)));

	common_val_print (deref_val, stream, recurse, options,
	current_language);
	}
	else
	fputs_filtered ("???", stream);
	}
	break;

	case TYPE_CODE_UNION:
	if (recurse && !options->unionprint)
	{
	fprintf_filtered (stream, "{...}");
	break;
	}
	/* Fall through. */
	case TYPE_CODE_STRUCT:
	/FIXME: Abstract this away. /
	if (options->vtblprint && cp_is_vtbl_ptr_type (type))
	{
	/* Print the unmangled name if desired. */
	/* Print vtable entry - we only get here if NOT using
	-fvtable_thunks. (Otherwise, look under
	TYPE_CODE_PTR.) */
	int offset = (embedded_offset
	+ TYPE_FIELD_BITPOS (type,
	VTBL_FNADDR_OFFSET) / 8);
	struct type *field_type = TYPE_FIELD_TYPE (type,
	VTBL_FNADDR_OFFSET);
	CORE_ADDR addr
	= extract_typed_address (valaddr + offset, field_type);

	print_function_pointer_address (gdbarch, addr, stream,
	options->addressprint);
	}
	else
	cp_print_value_fields_rtti (type, valaddr,
	embedded_offset, address,
	stream, recurse,
	original_value, options,
	NULL, 0);
	break;

	case TYPE_CODE_ENUM:
	if (options->format)
	{
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, options, 0, stream);
	break;
	}
	len = TYPE_NFIELDS (type);
	val = unpack_long (type, valaddr + embedded_offset);
	for (i = 0; i < len; i++)
	{
	QUIT;
	if (val == TYPE_FIELD_BITPOS (type, i))
	{
	break;
	}
	}
	if (i < len)
	{
	fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
	}
	else
	{
	print_longest (stream, 'd', 0, val);
	}
	break;

	case TYPE_CODE_FLAGS:
	if (options->format)
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, options, 0, stream);
	else
	val_print_type_code_flags (type, valaddr + embedded_offset,
	stream);
	break;

	case TYPE_CODE_FUNC:
	case TYPE_CODE_METHOD:
	if (options->format)
	{
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, options, 0, stream);
	break;
	}
	/* FIXME, we should consider, at least for ANSI C language,
	eliminating the distinction made between FUNCs and POINTERs
	to FUNCs. */
	fprintf_filtered (stream, "{");
	type_print (type, "", stream, -1);
	fprintf_filtered (stream, "} ");
	/* Try to print what function it points to, and its address. */
	print_address_demangle (gdbarch, address, stream, demangle);
	break;

	case TYPE_CODE_BOOL:
	if (options->format \|\| options->output_format)
	{
	struct value_print_options opts = *options;
	opts.format = (options->format ? options->format
	: options->output_format);
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, &opts, 0, stream);
	}
	else
	{
	val = unpack_long (type, valaddr + embedded_offset);
	if (val == 0)
	fputs_filtered ("false", stream);
	else if (val == 1)
	fputs_filtered ("true", stream);
	else
	print_longest (stream, 'd', 0, val);
	}
	break;

	case TYPE_CODE_RANGE:
	/* FIXME: create_range_type does not set the unsigned bit in a
	range type (I think it probably should copy it from the
	target type), so we won't print values which are too large to
	fit in a signed integer correctly. */
	/* FIXME: Doesn't handle ranges of enums correctly. (Can't just
	print with the target type, though, because the size of our
	type and the target type might differ). */
	/* FALLTHROUGH */

	case TYPE_CODE_INT:
	if (options->format \|\| options->output_format)
	{
	struct value_print_options opts = *options;

	opts.format = (options->format ? options->format
	: options->output_format);
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, &opts, 0, stream);
	}
	else
	{
	val_print_type_code_int (type, valaddr + embedded_offset,
	stream);
	/* C and C++ has no single byte int type, char is used
	instead. Since we don't know whether the value is really
	intended to be used as an integer or a character, print
	the character equivalent as well. */
	if (c_textual_element_type (unresolved_type, options->format))
	{
	fputs_filtered (" ", stream);
	LA_PRINT_CHAR (unpack_long (type, valaddr + embedded_offset),
	unresolved_type, stream);
	}
	}
	break;

	case TYPE_CODE_CHAR:
	if (options->format \|\| options->output_format)
	{
	struct value_print_options opts = *options;
	opts.format = (options->format ? options->format
	: options->output_format);
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, &opts, 0, stream);
	}
	else
	{
	val = unpack_long (type, valaddr + embedded_offset);
	if (TYPE_UNSIGNED (type))
	fprintf_filtered (stream, "%u", (unsigned int) val);
	else
	fprintf_filtered (stream, "%d", (int) val);
	fputs_filtered (" ", stream);
	LA_PRINT_CHAR (val, unresolved_type, stream);
	}
	break;

	case TYPE_CODE_FLT:
	if (options->format)
	{
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, options, 0, stream);
	}
	else
	{
	print_floating (valaddr + embedded_offset, type, stream);
	}
	break;

	case TYPE_CODE_DECFLOAT:
	if (options->format)
	val_print_scalar_formatted (type, valaddr, embedded_offset,
	original_value, options, 0, stream);
	else
	print_decimal_floating (valaddr + embedded_offset,
	type, stream);
	break;

	case TYPE_CODE_VOID:
	fprintf_filtered (stream, "void");
	break;

	case TYPE_CODE_ERROR:
	fprintf_filtered (stream, "%s", TYPE_ERROR_NAME (type));
	break;

	case TYPE_CODE_UNDEF:
	/* This happens (without TYPE_FLAG_STUB set) on systems which
	don't use dbx xrefs (NO_DBX_XREFS in gcc) if a file has a
	"struct foo *bar" and no complete type for struct foo in that
	file. */
	fprintf_filtered (stream, _("<incomplete type>"));
	break;

	case TYPE_CODE_COMPLEX:
	if (options->format)
	val_print_scalar_formatted (TYPE_TARGET_TYPE (type),
	valaddr, embedded_offset,
	original_value, options, 0, stream);
	else
	print_floating (valaddr + embedded_offset,
	TYPE_TARGET_TYPE (type),
	stream);
	fprintf_filtered (stream, " + ");
	if (options->format)
	val_print_scalar_formatted (TYPE_TARGET_TYPE (type),
	valaddr,
	embedded_offset
	+ TYPE_LENGTH (TYPE_TARGET_TYPE (type)),
	original_value,
	options, 0, stream);
	else
	print_floating (valaddr + embedded_offset
	+ TYPE_LENGTH (TYPE_TARGET_TYPE (type)),
	TYPE_TARGET_TYPE (type),
	stream);
	fprintf_filtered (stream, " * I");
	break;

	default:
	error (_("Invalid C/C++ type code %d in symbol table."),
	TYPE_CODE (type));
	}
	gdb_flush (stream);
	return (0);
	}

	int
	c_value_print (struct value val, struct ui_file stream,
	const struct value_print_options *options)
	{
	struct type type, real_type, *val_type;
	int full, top, using_enc;
	struct value_print_options opts = *options;

	opts.deref_ref = 1;

	/* If it is a pointer, indicate what it points to.

	Print type also if it is a reference.

	C++: if it is a member pointer, we will take care
	of that when we print it. */

	/* Preserve the original type before stripping typedefs. We prefer
	to pass down the original type when possible, but for local
	checks it is better to look past the typedefs. */
	val_type = value_type (val);
	type = check_typedef (val_type);

	if (TYPE_CODE (type) == TYPE_CODE_PTR
	\|\| TYPE_CODE (type) == TYPE_CODE_REF)
	{
	/* Hack: remove (char *) for char strings. Their
	type is indicated by the quoted string anyway.
	(Don't use c_textual_element_type here; quoted strings
	are always exactly (char ), (wchar_t ), or the like. */
	if (TYPE_CODE (val_type) == TYPE_CODE_PTR
	&& TYPE_NAME (val_type) == NULL
	&& TYPE_NAME (TYPE_TARGET_TYPE (val_type)) != NULL
	&& (strcmp (TYPE_NAME (TYPE_TARGET_TYPE (val_type)),
	"char") == 0
	\|\| textual_name (TYPE_NAME (TYPE_TARGET_TYPE (val_type)))))
	{
	/* Print nothing. */
	}
	else if (options->objectprint
	&& (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
	{

	if (TYPE_CODE(type) == TYPE_CODE_REF)
	{
	/* Copy value, change to pointer, so we don't get an
	error about a non-pointer type in
	value_rtti_target_type. */
	struct value *temparg;
	temparg=value_copy(val);
	deprecated_set_value_type
	(temparg, lookup_pointer_type (TYPE_TARGET_TYPE (type)));
	val = temparg;
	}
	/* Pointer to class, check real type of object. */
	fprintf_filtered (stream, "(");

	if (value_entirely_available (val))
	{
	real_type = value_rtti_target_type (val, &full, &top, &using_enc);
	if (real_type)
	{
	/* RTTI entry found. */
	if (TYPE_CODE (type) == TYPE_CODE_PTR)
	{
	/* Create a pointer type pointing to the real
	type. */
	type = lookup_pointer_type (real_type);
	}
	else
	{
	/* Create a reference type referencing the real
	type. */
	type = lookup_reference_type (real_type);
	}
	/* Need to adjust pointer value. */
	val = value_from_pointer (type, value_as_address (val) - top);

	/* Note: When we look up RTTI entries, we don't get
	any information on const or volatile
	attributes. */
	}
	}
	type_print (type, "", stream, -1);
	fprintf_filtered (stream, ") ");
	val_type = type;
	}
	else
	{
	/* normal case */
	fprintf_filtered (stream, "(");
	type_print (value_type (val), "", stream, -1);
	fprintf_filtered (stream, ") ");
	}
	}

	if (!value_initialized (val))
	fprintf_filtered (stream, " [uninitialized] ");

	if (options->objectprint && (TYPE_CODE (type) == TYPE_CODE_CLASS))
	{
	/* Attempt to determine real type of object. */
	real_type = value_rtti_type (val, &full, &top, &using_enc);
	if (real_type)
	{
	/* We have RTTI information, so use it. */
	val = value_full_object (val, real_type,
	full, top, using_enc);
	fprintf_filtered (stream, "(%s%s) ",
	TYPE_NAME (real_type),
	full ? "" : _(" [incomplete object]"));
	/* Print out object: enclosing type is same as real_type if
	full. */
	return val_print (value_enclosing_type (val),
	value_contents_for_printing (val), 0,
	value_address (val), stream, 0,
	val, &opts, current_language);
	/* Note: When we look up RTTI entries, we don't get any
	information on const or volatile attributes. */
	}
	else if (type != check_typedef (value_enclosing_type (val)))
	{
	/* No RTTI information, so let's do our best. */
	fprintf_filtered (stream, "(%s ?) ",
	TYPE_NAME (value_enclosing_type (val)));
	return val_print (value_enclosing_type (val),
	value_contents_for_printing (val), 0,
	value_address (val), stream, 0,
	val, &opts, current_language);
	}
	/* Otherwise, we end up at the return outside this "if". */
	}

	return val_print (val_type, value_contents_for_printing (val),
	value_embedded_offset (val),
	value_address (val),
	stream, 0,
	val, &opts, current_language);
	}