gdb/d-valprint.c

   1 /* Support for printing D values for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2020 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 a
  27    dynamic array, and then print its value to STREAM.  Return zero if
  28    TYPE is a dynamic array, non-zero otherwise.  */
  29
  30 static int
  31 dynamic_array_type (struct type *type,
  32                     LONGEST embedded_offset, CORE_ADDR address,
  33                     struct ui_file *stream, int recurse,
  34                     struct value *val,
  35                     const struct value_print_options *options)
  36 {
  37   if (type->num_fields () == 2
  38       && TYPE_FIELD_TYPE (type, 0)->code () == TYPE_CODE_INT
  39       && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
  40       && strcmp (TYPE_FIELD_NAME (type, 1), "ptr") == 0
  41       && !value_bits_any_optimized_out (val,
  42                                         TARGET_CHAR_BIT * embedded_offset,
  43                                         TARGET_CHAR_BIT * TYPE_LENGTH (type)))
  44     {
  45       CORE_ADDR addr;
  46       struct type *elttype;
  47       struct type *true_type;
  48       struct type *ptr_type;
  49       struct value *ival;
  50       int length;
  51       const gdb_byte *valaddr = value_contents_for_printing (val);
  52
  53       length = unpack_field_as_long (type, valaddr + embedded_offset, 0);
  54
  55       ptr_type = TYPE_FIELD_TYPE (type, 1);
  56       elttype = check_typedef (TYPE_TARGET_TYPE (ptr_type));
  57       addr = unpack_pointer (ptr_type,
  58                              valaddr + TYPE_FIELD_BITPOS (type, 1) / 8
  59                              + embedded_offset);
  60       true_type = check_typedef (elttype);
  61
  62       true_type = lookup_array_range_type (true_type, 0, length - 1);
  63       ival = value_at (true_type, addr);
  64       true_type = value_type (ival);
  65
  66       d_value_print_inner (ival, stream, recurse + 1, options);
  67       return 0;
  68     }
  69   return 1;
  70 }
  71
  72 /* See d-lang.h.  */
  73
  74 void
  75 d_value_print_inner (struct value *val, struct ui_file *stream, int recurse,
  76                      const struct value_print_options *options)
  77 {
  78   int ret;
  79
  80   struct type *type = check_typedef (value_type (val));
  81   switch (type->code ())
  82     {
  83       case TYPE_CODE_STRUCT:
  84         ret = dynamic_array_type (type, value_embedded_offset (val),
  85                                   value_address (val),
  86                                   stream, recurse, val, options);
  87         if (ret == 0)
  88           break;
  89         /* Fall through.  */
  90       default:
  91         c_value_print_inner (val, stream, recurse, options);
  92         break;
  93     }
  94 }