gdb/d-valprint.c

   1 /* Support for printing D values for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2023 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 (0).type ()->code () == TYPE_CODE_INT
  39       && strcmp (type->field (0).name (), "length") == 0
  40       && strcmp (type->field (1).name (), "ptr") == 0
  41       && !val->bits_any_optimized_out (TARGET_CHAR_BIT * embedded_offset,
  42                                        TARGET_CHAR_BIT * type->length ()))
  43     {
  44       CORE_ADDR addr;
  45       struct type *elttype;
  46       struct type *true_type;
  47       struct type *ptr_type;
  48       struct value *ival;
  49       int length;
  50       const gdb_byte *valaddr = val->contents_for_printing ().data ();
  51
  52       length = unpack_field_as_long (type, valaddr + embedded_offset, 0);
  53
  54       ptr_type = type->field (1).type ();
  55       elttype = check_typedef (ptr_type->target_type ());
  56       addr = unpack_pointer (ptr_type,
  57                              valaddr + type->field (1).loc_bitpos () / 8
  58                              + embedded_offset);
  59       true_type = check_typedef (elttype);
  60
  61       true_type = lookup_array_range_type (true_type, 0, length - 1);
  62       ival = value_at (true_type, addr);
  63       true_type = ival->type ();
  64
  65       d_value_print_inner (ival, stream, recurse + 1, options);
  66       return 0;
  67     }
  68   return 1;
  69 }
  70
  71 /* See d-lang.h.  */
  72
  73 void
  74 d_value_print_inner (struct value *val, struct ui_file *stream, int recurse,
  75                      const struct value_print_options *options)
  76 {
  77   int ret;
  78
  79   struct type *type = check_typedef (val->type ());
  80   switch (type->code ())
  81     {
  82       case TYPE_CODE_STRUCT:
  83         ret = dynamic_array_type (type, val->embedded_offset (),
  84                                   val->address (),
  85                                   stream, recurse, val, options);
  86         if (ret == 0)
  87           break;
  88         /* Fall through.  */
  89       default:
  90         c_value_print_inner (val, stream, recurse, options);
  91         break;
  92     }
  93 }