gdb/d-valprint.c

   1 /* Support for printing D values for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdbtypes.h"
  22 #include "gdbcore.h"
  23 #include "d-lang.h"
  24 #include "c-lang.h"
  25
  26 /* Assuming that TYPE is a TYPE_CODE_STRUCT, verify that TYPE is
  27    a dynamic array, and then print its value to STREAM.  Return
  28    the number of string characters printed, or -1 if TYPE is not
  29    a dynamic array.  */
  30 static int
  31 dynamic_array_type (struct type *type, const gdb_byte *valaddr,
  32                     int embedded_offset, CORE_ADDR address,
  33                     struct ui_file *stream, int recurse,
  34                     const struct value *val,
  35                     const struct value_print_options *options)
  36 {
  37   if (TYPE_NFIELDS (type) == 2
  38       && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_INT
  39       && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
  40       && strcmp (TYPE_FIELD_NAME (type, 1), "ptr") == 0
  41       && value_bits_valid (val, TARGET_CHAR_BIT * embedded_offset,
  42                            TARGET_CHAR_BIT * TYPE_LENGTH (type)))
  43     {
  44       CORE_ADDR addr;
  45       struct type *elttype;
  46       struct type *true_type;
  47       struct type *ptr_type;
  48       const gdb_byte *ptraddr;
  49       struct value *val;
  50       int length;
  51
  52       length = unpack_field_as_long (type, valaddr + embedded_offset, 0);
  53
  54       ptr_type = TYPE_FIELD_TYPE (type, 1);
  55       elttype = check_typedef (TYPE_TARGET_TYPE (ptr_type));
  56       addr = unpack_pointer (ptr_type,
  57                              valaddr + TYPE_FIELD_BITPOS (type, 1) / 8
  58                              + embedded_offset);
  59       true_type = check_typedef (elttype);
  60
  61       true_type = lookup_array_range_type (true_type, 0, length - 1);
  62       val = value_at (true_type, addr);
  63       ptraddr = value_contents (val);
  64
  65       return d_val_print (true_type, ptraddr, 0, addr, stream, recurse + 1,
  66                           NULL, options);
  67     }
  68   return -1;
  69 }
  70
  71 /* Implements the la_val_print routine for language D.  */
  72 int
  73 d_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
  74              CORE_ADDR address, struct ui_file *stream, int recurse,
  75              const struct value *val,
  76              const struct value_print_options *options)
  77 {
  78   int ret;
  79
  80   CHECK_TYPEDEF (type);
  81   switch (TYPE_CODE (type))
  82     {
  83       case TYPE_CODE_STRUCT:
  84         ret = dynamic_array_type (type, valaddr, embedded_offset, address,
  85                                   stream, recurse, val, options);
  86         if (ret != -1)
  87            break;
  88       default:
  89         ret = c_val_print (type, valaddr, embedded_offset, address, stream,
  90                            recurse, val, options);
  91     }
  92
  93   return ret;
  94 }