gdb/d-valprint.c

   1 /* Support for printing D values for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2019 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
  22 /* Local non-gdb includes.  */
  23 #include "c-lang.h"
  24 #include "d-lang.h"
  25 #include "gdbcore.h"
  26 #include "gdbtypes.h"
  27
  28 /* Assuming that TYPE is a TYPE_CODE_STRUCT, verify that TYPE is a
  29    dynamic array, and then print its value to STREAM.  Return zero if
  30    TYPE is a dynamic array, non-zero otherwise.  */
  31
  32 static int
  33 dynamic_array_type (struct type *type,
  34                     LONGEST embedded_offset, CORE_ADDR address,
  35                     struct ui_file *stream, int recurse,
  36                     struct value *val,
  37                     const struct value_print_options *options)
  38 {
  39   if (TYPE_NFIELDS (type) == 2
  40       && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_INT
  41       && strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
  42       && strcmp (TYPE_FIELD_NAME (type, 1), "ptr") == 0
  43       && !value_bits_any_optimized_out (val,
  44                                         TARGET_CHAR_BIT * embedded_offset,
  45                                         TARGET_CHAR_BIT * TYPE_LENGTH (type)))
  46     {
  47       CORE_ADDR addr;
  48       struct type *elttype;
  49       struct type *true_type;
  50       struct type *ptr_type;
  51       struct value *ival;
  52       int length;
  53       const gdb_byte *valaddr = value_contents_for_printing (val);
  54
  55       length = unpack_field_as_long (type, valaddr + embedded_offset, 0);
  56
  57       ptr_type = TYPE_FIELD_TYPE (type, 1);
  58       elttype = check_typedef (TYPE_TARGET_TYPE (ptr_type));
  59       addr = unpack_pointer (ptr_type,
  60                              valaddr + TYPE_FIELD_BITPOS (type, 1) / 8
  61                              + embedded_offset);
  62       true_type = check_typedef (elttype);
  63
  64       true_type = lookup_array_range_type (true_type, 0, length - 1);
  65       ival = value_at (true_type, addr);
  66       true_type = value_type (ival);
  67
  68       d_val_print (true_type,
  69                    value_embedded_offset (ival), addr,
  70                    stream, recurse + 1, ival, options);
  71       return 0;
  72     }
  73   return 1;
  74 }
  75
  76 /* Implements the la_val_print routine for language D.  */
  77 void
  78 d_val_print (struct type *type, int embedded_offset,
  79              CORE_ADDR address, struct ui_file *stream, int recurse,
  80              struct value *val,
  81              const struct value_print_options *options)
  82 {
  83   int ret;
  84
  85   type = check_typedef (type);
  86   switch (TYPE_CODE (type))
  87     {
  88       case TYPE_CODE_STRUCT:
  89         ret = dynamic_array_type (type, embedded_offset, address,
  90                                   stream, recurse, val, options);
  91         if (ret == 0)
  92           break;
  93         /* Fall through.  */
  94       default:
  95         c_val_print (type, embedded_offset, address, stream,
  96                      recurse, val, options);
  97     }
  98 }