gdb/d-valprint.c

   1 /* Support for printing D values for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2024 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 "gdbtypes.h"
  21 #include "gdbcore.h"
  22 #include "d-lang.h"
  23 #include "c-lang.h"
  24
  25 /* Assuming that TYPE is a TYPE_CODE_STRUCT, verify that TYPE is a
  26    dynamic array, and then print its value to STREAM.  Return zero if
  27    TYPE is a dynamic array, non-zero otherwise.  */
  28
  29 static int
  30 dynamic_array_type (struct type *type,
  31                     LONGEST embedded_offset, CORE_ADDR address,
  32                     struct ui_file *stream, int recurse,
  33                     struct value *val,
  34                     const struct value_print_options *options)
  35 {
  36   if (type->num_fields () == 2
  37       && type->field (0).type ()->code () == TYPE_CODE_INT
  38       && strcmp (type->field (0).name (), "length") == 0
  39       && strcmp (type->field (1).name (), "ptr") == 0
  40       && !val->bits_any_optimized_out (TARGET_CHAR_BIT * embedded_offset,
  41                                        TARGET_CHAR_BIT * type->length ()))
  42     {
  43       CORE_ADDR addr;
  44       struct type *elttype;
  45       struct type *true_type;
  46       struct type *ptr_type;
  47       struct value *ival;
  48       int length;
  49       const gdb_byte *valaddr = val->contents_for_printing ().data ();
  50
  51       length = unpack_field_as_long (type, valaddr + embedded_offset, 0);
  52
  53       ptr_type = type->field (1).type ();
  54       elttype = check_typedef (ptr_type->target_type ());
  55       addr = unpack_pointer (ptr_type,
  56                              valaddr + type->field (1).loc_bitpos () / 8
  57                              + embedded_offset);
  58       true_type = check_typedef (elttype);
  59
  60       true_type = lookup_array_range_type (true_type, 0, length - 1);
  61       ival = value_at (true_type, addr);
  62       true_type = ival->type ();
  63
  64       d_value_print_inner (ival, stream, recurse + 1, options);
  65       return 0;
  66     }
  67   return 1;
  68 }
  69
  70 /* See d-lang.h.  */
  71
  72 void
  73 d_value_print_inner (struct value *val, struct ui_file *stream, int recurse,
  74                      const struct value_print_options *options)
  75 {
  76   int ret;
  77
  78   struct type *type = check_typedef (val->type ());
  79   switch (type->code ())
  80     {
  81       case TYPE_CODE_STRUCT:
  82         ret = dynamic_array_type (type, val->embedded_offset (),
  83                                   val->address (),
  84                                   stream, recurse, val, options);
  85         if (ret == 0)
  86           break;
  87         [[fallthrough]];
  88       default:
  89         c_value_print_inner (val, stream, recurse, options);
  90         break;
  91     }
  92 }