aboutsummaryrefslogtreecommitdiff
path: root/gdb/hpacc-abi.c
blob: 2cb21381da4820ec7538550a875ce2368cdfa006 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/* Abstraction of HP aCC ABI.

   Contributed by Daniel Berlin <dberlin@redhat.com>
   Most of the real code is from HP, i've just fiddled it to fit in
   the C++ ABI abstraction framework.

   Copyright (C) 2001, 2005 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or
   modify
   it under the terms of the GNU General Public License as published
   by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

#include "defs.h"
#include "value.h"
#include "gdb_regex.h"
#include "gdb_string.h"
#include "gdbtypes.h"
#include "gdbcore.h"
#include "cp-abi.h"
#include "gnu-v2-abi.h"

struct cp_abi_ops hpacc_abi_ops;

/* It appears the is_*_name stuff is never used when we try the hpACC
 * ABI. As such, I have no clue what the real answers are. Shouldn't
 * have any more effect than it does now.  */
static regex_t constructor_pattern;
static regex_t destructor_pattern;
static regex_t operator_pattern;

static enum dtor_kinds
hpacc_is_destructor_name (const char *name)
{
  if (regexec (&destructor_pattern, name, 0, 0, 0) == 0)
    return complete_object_dtor;
  else
    return 0;
}

static enum ctor_kinds
hpacc_is_constructor_name (const char *name)
{
  if (regexec (&constructor_pattern, name, 0, 0, 0) == 0)
    return complete_object_ctor;
  else
    return 0;
}

static int
hpacc_is_operator_name (const char *name)
{
  return regexec (&operator_pattern, name, 0, 0, 0) == 0;
}

static int
hpacc_is_vtable_name (const char *name)
{
  return strcmp (name,
		 "This will never match anything, please fill it in") == 0;
}

/* Return a virtual function as a value.
   ARG1 is the object which provides the virtual function
   table pointer.  *ARG1P is side-effected in calling this function.
   F is the list of member functions which contains the desired virtual
   function.
   J is an index into F which provides the desired virtual function.

   TYPE is the type in which F is located.  */
static struct value *
hpacc_virtual_fn_field (struct value **arg1p, struct fn_field * f, int j,
			struct type * type, int offset)
{
  struct value *arg1 = *arg1p;
  struct type *type1 = check_typedef (value_type (arg1));

  /* Deal with HP/Taligent runtime model for virtual functions */
  struct value *vp;
  struct value *argp;		/* arg1 cast to base */
  CORE_ADDR coreptr;		/* pointer to target address */
  int class_index;		/* which class segment pointer to use */
  struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);	/* method type */

  argp = value_cast (type, *arg1p);

  if (VALUE_ADDRESS (argp) == 0)
    error (_("Address of object is null; object may not have been created."));

  /* pai: FIXME -- 32x64 possible problem? */
  /* First word (4 bytes) in object layout is the vtable pointer */
  coreptr = *(CORE_ADDR *) (value_contents (argp));	/* pai: (temp)  */
  /* + offset + value_embedded_offset (argp)); */

  if (!coreptr)
    error
      ("Virtual table pointer is null for object; object may not have been created.");

  /* pai/1997-05-09
   * FIXME: The code here currently handles only
   * the non-RRBC case of the Taligent/HP runtime spec; when RRBC
   * is introduced, the condition for the "if" below will have to
   * be changed to be a test for the RRBC case.  */

  if (1)
    {
      /* Non-RRBC case; the virtual function pointers are stored at fixed
       * offsets in the virtual table. */

      /* Retrieve the offset in the virtual table from the debug
       * info.  The offset of the vfunc's entry is in words from
       * the beginning of the vtable; but first we have to adjust
       * by HP_ACC_VFUNC_START to account for other entries */

      /* pai: FIXME: 32x64 problem here, a word may be 8 bytes in
       * which case the multiplier should be 8 and values should be long */
      vp = value_at (builtin_type_int,
		     coreptr + 4 * (TYPE_FN_FIELD_VOFFSET (f, j) +
				    HP_ACC_VFUNC_START));

      coreptr = *(CORE_ADDR *) (value_contents (vp));
      /* coreptr now contains the address of the virtual function */
      /* (Actually, it contains the pointer to the plabel for the function. */
    }
  else
    {
      /* RRBC case; the virtual function pointers are found by double
       * indirection through the class segment tables. */

      /* Choose class segment depending on type we were passed */
      class_index = class_index_in_primary_list (type);

      /* Find class segment pointer.  These are in the vtable slots after
       * some other entries, so adjust by HP_ACC_VFUNC_START for that. */
      /* pai: FIXME 32x64 problem here, if words are 8 bytes long
       * the multiplier below has to be 8 and value should be long. */
      vp = value_at (builtin_type_int,
		     coreptr + 4 * (HP_ACC_VFUNC_START + class_index));
      /* Indirect once more, offset by function index */
      /* pai: FIXME 32x64 problem here, again multiplier could be 8 and value long */
      coreptr =
	*(CORE_ADDR *) (value_contents (vp) +
			4 * TYPE_FN_FIELD_VOFFSET (f, j));
      vp = value_at (builtin_type_int, coreptr);
      coreptr = *(CORE_ADDR *) (value_contents (vp));

      /* coreptr now contains the address of the virtual function */
      /* (Actually, it contains the pointer to the plabel for the function.) */

    }

  if (!coreptr)
    error (_("Address of virtual function is null; error in virtual table?"));

  /* Wrap this addr in a value and return pointer */
  vp = allocate_value (ftype);
  deprecated_set_value_type (vp, ftype);
  VALUE_ADDRESS (vp) = coreptr;

  /* pai: (temp) do we need the value_ind stuff in value_fn_field? */
  return vp;
}


static struct type *
hpacc_value_rtti_type (struct value *v, int *full, int *top, int *using_enc)
{
  struct type *known_type;
  struct type *rtti_type;
  CORE_ADDR coreptr;
  struct value *vp;
  int using_enclosing = 0;
  long top_offset = 0;
  char rtti_type_name[256];

  if (full)
    *full = 0;
  if (top)
    *top = -1;
  if (using_enc)
    *using_enc = 0;

  /* Get declared type */
  known_type = value_type (v);
  CHECK_TYPEDEF (known_type);
  /* RTTI works only or class objects */
  if (TYPE_CODE (known_type) != TYPE_CODE_CLASS)
    return NULL;

  /* If neither the declared type nor the enclosing type of the
   * value structure has a HP ANSI C++ style virtual table,
   * we can't do anything. */
  if (!TYPE_HAS_VTABLE (known_type))
    {
      known_type = value_enclosing_type (v);
      CHECK_TYPEDEF (known_type);
      if ((TYPE_CODE (known_type) != TYPE_CODE_CLASS) ||
          !TYPE_HAS_VTABLE (known_type))
        return NULL;		/* No RTTI, or not HP-compiled types */
      CHECK_TYPEDEF (known_type);
      using_enclosing = 1;
    }

  if (using_enclosing && using_enc)
    *using_enc = 1;

  /* First get the virtual table address */
  coreptr = *(CORE_ADDR *) ((value_contents_all (v))
                            + value_offset (v)
                            + (using_enclosing
                               ? 0
                               : value_embedded_offset (v)));
  if (coreptr == 0)
    /* return silently -- maybe called on gdb-generated value */
    return NULL;
  
  /* Fetch the top offset of the object */
  /* FIXME possible 32x64 problem with pointer size & arithmetic */
  vp = value_at (builtin_type_int,
                 coreptr + 4 * HP_ACC_TOP_OFFSET_OFFSET);
  top_offset = value_as_long (vp);
  if (top)
    *top = top_offset;

  /* Fetch the typeinfo pointer */
  /* FIXME possible 32x64 problem with pointer size & arithmetic */
  vp = value_at (builtin_type_int, coreptr + 4 * HP_ACC_TYPEINFO_OFFSET);
  /* Indirect through the typeinfo pointer and retrieve the pointer
   * to the string name */
  coreptr = *(CORE_ADDR *) (value_contents (vp));
  if (!coreptr)
    error (_("Retrieved null typeinfo pointer in trying to determine "
           "run-time type"));
  /* 4 -> offset of name field */
  vp = value_at (builtin_type_int, coreptr + 4);
  /* FIXME possible 32x64 problem */

  coreptr = *(CORE_ADDR *) (value_contents (vp));

  read_memory_string (coreptr, rtti_type_name, 256);

  if (strlen (rtti_type_name) == 0)
    error (_("Retrieved null type name from typeinfo"));

  /* search for type */
  rtti_type = lookup_typename (rtti_type_name, (struct block *) 0, 1);

  if (!rtti_type)
    error (_("Could not find run-time type: invalid type name %s in typeinfo??"),
           rtti_type_name);
  CHECK_TYPEDEF (rtti_type);
#if 0
  printf ("RTTI type name %s, tag %s, full? %d\n", TYPE_NAME (rtti_type),
          TYPE_TAG_NAME (rtti_type), full ? *full : -1);
#endif
  /* Check whether we have the entire object */
  if (full			/* Non-null pointer passed */
      &&
      /* Either we checked on the whole object in hand and found the
         top offset to be zero */
      (((top_offset == 0) &&
        using_enclosing &&
        TYPE_LENGTH (known_type) == TYPE_LENGTH (rtti_type))
       ||
       /* Or we checked on the embedded object and top offset was the
          same as the embedded offset */
       ((top_offset == value_embedded_offset (v)) &&
        !using_enclosing &&
        TYPE_LENGTH (value_enclosing_type (v)) == TYPE_LENGTH (rtti_type))))

    *full = 1;

  return rtti_type;
}

static void
init_hpacc_ops (void)
{
  hpacc_abi_ops.shortname = "hpaCC";
  hpacc_abi_ops.longname = "HP aCC ABI";
  hpacc_abi_ops.doc = "HP aCC ABI";
  hpacc_abi_ops.is_destructor_name = hpacc_is_destructor_name;
  hpacc_abi_ops.is_constructor_name = hpacc_is_constructor_name;
  hpacc_abi_ops.is_vtable_name = hpacc_is_vtable_name;
  hpacc_abi_ops.is_operator_name = hpacc_is_operator_name;
  hpacc_abi_ops.virtual_fn_field = hpacc_virtual_fn_field;
  hpacc_abi_ops.rtti_type = hpacc_value_rtti_type;
  /* It seems that this function is specific to GNU G++ < 3.0.
     However, it is called for data members even in the HP
     case (although not for member functions).
     FIXME: Is that correct?  */
  hpacc_abi_ops.baseclass_offset = gnuv2_baseclass_offset;
}

extern initialize_file_ftype _initialize_hpacc_abi; /* -Wmissing-prototypes */

void
_initialize_hpacc_abi (void)
{
  init_hpacc_ops ();

  regcomp (&constructor_pattern,
	   "^This will never match anything, please fill it in$", REG_NOSUB);

  regcomp (&destructor_pattern,
	   "^This will never match anything, please fill it in$", REG_NOSUB);

  regcomp (&operator_pattern,
	   "^This will never match anything, please fill it in$", REG_NOSUB);

  register_cp_abi (&hpacc_abi_ops);
}