1 /* Abstraction of HP aCC ABI.
2 Contributed by Daniel Berlin <dberlin@redhat.com>
3 Most of the real code is from HP, i've just fiddled it to fit in
4 the C++ ABI abstraction framework.
6 Copyright 2001 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or
12 it under the terms of the GNU General Public License as published
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 59 Temple Place - Suite 330,
25 Boston, MA 02111-1307, USA. */
29 #include "gdb_regex.h"
30 #include "gdb_string.h"
35 struct cp_abi_ops hpacc_abi_ops;
37 /* It appears the is_*_name stuff is never used when we try the hpACC
38 * ABI. As such, I have no clue what the real answers are. Shouldn't
39 * have any more effect than it does now. */
40 static regex_t constructor_pattern;
41 static regex_t destructor_pattern;
42 static regex_t operator_pattern;
44 static enum dtor_kinds
45 hpacc_is_destructor_name (const char *name)
47 if (regexec (&destructor_pattern, name, 0, 0, 0) == 0)
48 return complete_object_dtor;
53 static enum ctor_kinds
54 hpacc_is_constructor_name (const char *name)
56 if (regexec (&constructor_pattern, name, 0, 0, 0) == 0)
57 return complete_object_ctor;
63 hpacc_is_operator_name (const char *name)
65 return regexec (&operator_pattern, name, 0, 0, 0) == 0;
69 hpacc_is_vtable_name (const char *name)
72 "This will never match anything, please fill it in") == 0;
75 /* Return a virtual function as a value.
76 ARG1 is the object which provides the virtual function
77 table pointer. *ARG1P is side-effected in calling this function.
78 F is the list of member functions which contains the desired virtual
80 J is an index into F which provides the desired virtual function.
82 TYPE is the type in which F is located. */
84 hpacc_virtual_fn_field (struct value **arg1p, struct fn_field * f, int j,
85 struct type * type, int offset)
87 struct value *arg1 = *arg1p;
88 struct type *type1 = check_typedef (VALUE_TYPE (arg1));
90 /* Deal with HP/Taligent runtime model for virtual functions */
92 struct value *argp; /* arg1 cast to base */
93 CORE_ADDR coreptr; /* pointer to target address */
94 int class_index; /* which class segment pointer to use */
95 struct type *ftype = TYPE_FN_FIELD_TYPE (f, j); /* method type */
97 argp = value_cast (type, *arg1p);
99 if (VALUE_ADDRESS (argp) == 0)
100 error ("Address of object is null; object may not have been created.");
102 /* pai: FIXME -- 32x64 possible problem? */
103 /* First word (4 bytes) in object layout is the vtable pointer */
104 coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (argp)); /* pai: (temp) */
105 /* + offset + VALUE_EMBEDDED_OFFSET (argp)); */
109 ("Virtual table pointer is null for object; object may not have been created.");
112 * FIXME: The code here currently handles only
113 * the non-RRBC case of the Taligent/HP runtime spec; when RRBC
114 * is introduced, the condition for the "if" below will have to
115 * be changed to be a test for the RRBC case. */
119 /* Non-RRBC case; the virtual function pointers are stored at fixed
120 * offsets in the virtual table. */
122 /* Retrieve the offset in the virtual table from the debug
123 * info. The offset of the vfunc's entry is in words from
124 * the beginning of the vtable; but first we have to adjust
125 * by HP_ACC_VFUNC_START to account for other entries */
127 /* pai: FIXME: 32x64 problem here, a word may be 8 bytes in
128 * which case the multiplier should be 8 and values should be long */
129 vp = value_at (builtin_type_int,
130 coreptr + 4 * (TYPE_FN_FIELD_VOFFSET (f, j) +
131 HP_ACC_VFUNC_START), NULL);
133 coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
134 /* coreptr now contains the address of the virtual function */
135 /* (Actually, it contains the pointer to the plabel for the function. */
139 /* RRBC case; the virtual function pointers are found by double
140 * indirection through the class segment tables. */
142 /* Choose class segment depending on type we were passed */
143 class_index = class_index_in_primary_list (type);
145 /* Find class segment pointer. These are in the vtable slots after
146 * some other entries, so adjust by HP_ACC_VFUNC_START for that. */
147 /* pai: FIXME 32x64 problem here, if words are 8 bytes long
148 * the multiplier below has to be 8 and value should be long. */
149 vp = value_at (builtin_type_int,
150 coreptr + 4 * (HP_ACC_VFUNC_START + class_index), NULL);
151 /* Indirect once more, offset by function index */
152 /* pai: FIXME 32x64 problem here, again multiplier could be 8 and value long */
154 *(CORE_ADDR *) (VALUE_CONTENTS (vp) +
155 4 * TYPE_FN_FIELD_VOFFSET (f, j));
156 vp = value_at (builtin_type_int, coreptr, NULL);
157 coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
159 /* coreptr now contains the address of the virtual function */
160 /* (Actually, it contains the pointer to the plabel for the function.) */
165 error ("Address of virtual function is null; error in virtual table?");
167 /* Wrap this addr in a value and return pointer */
168 vp = allocate_value (ftype);
169 VALUE_TYPE (vp) = ftype;
170 VALUE_ADDRESS (vp) = coreptr;
172 /* pai: (temp) do we need the value_ind stuff in value_fn_field? */
178 hpacc_value_rtti_type (struct value *v, int *full, int *top, int *using_enc)
180 struct type *known_type;
181 struct type *rtti_type;
184 int using_enclosing = 0;
186 char rtti_type_name[256];
195 /* Get declared type */
196 known_type = VALUE_TYPE (v);
197 CHECK_TYPEDEF (known_type);
198 /* RTTI works only or class objects */
199 if (TYPE_CODE (known_type) != TYPE_CODE_CLASS)
202 /* If neither the declared type nor the enclosing type of the
203 * value structure has a HP ANSI C++ style virtual table,
204 * we can't do anything. */
205 if (!TYPE_HAS_VTABLE (known_type))
207 known_type = VALUE_ENCLOSING_TYPE (v);
208 CHECK_TYPEDEF (known_type);
209 if ((TYPE_CODE (known_type) != TYPE_CODE_CLASS) ||
210 !TYPE_HAS_VTABLE (known_type))
211 return NULL; /* No RTTI, or not HP-compiled types */
212 CHECK_TYPEDEF (known_type);
216 if (using_enclosing && using_enc)
219 /* First get the virtual table address */
220 coreptr = *(CORE_ADDR *) ((VALUE_CONTENTS_ALL (v))
224 : VALUE_EMBEDDED_OFFSET (v)));
226 /* return silently -- maybe called on gdb-generated value */
229 /* Fetch the top offset of the object */
230 /* FIXME possible 32x64 problem with pointer size & arithmetic */
231 vp = value_at (builtin_type_int,
232 coreptr + 4 * HP_ACC_TOP_OFFSET_OFFSET,
233 VALUE_BFD_SECTION (v));
234 top_offset = value_as_long (vp);
238 /* Fetch the typeinfo pointer */
239 /* FIXME possible 32x64 problem with pointer size & arithmetic */
240 vp = value_at (builtin_type_int, coreptr + 4 * HP_ACC_TYPEINFO_OFFSET,
241 VALUE_BFD_SECTION (v));
242 /* Indirect through the typeinfo pointer and retrieve the pointer
243 * to the string name */
244 coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
246 error ("Retrieved null typeinfo pointer in trying to determine "
248 /* 4 -> offset of name field */
249 vp = value_at (builtin_type_int, coreptr + 4, VALUE_BFD_SECTION (v));
250 /* FIXME possible 32x64 problem */
252 coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
254 read_memory_string (coreptr, rtti_type_name, 256);
256 if (strlen (rtti_type_name) == 0)
257 error ("Retrieved null type name from typeinfo");
259 /* search for type */
260 rtti_type = lookup_typename (rtti_type_name, (struct block *) 0, 1);
263 error ("Could not find run-time type: invalid type name %s in typeinfo??",
265 CHECK_TYPEDEF (rtti_type);
267 printf ("RTTI type name %s, tag %s, full? %d\n", TYPE_NAME (rtti_type),
268 TYPE_TAG_NAME (rtti_type), full ? *full : -1);
270 /* Check whether we have the entire object */
271 if (full /* Non-null pointer passed */
273 /* Either we checked on the whole object in hand and found the
274 top offset to be zero */
275 (((top_offset == 0) &&
277 TYPE_LENGTH (known_type) == TYPE_LENGTH (rtti_type))
279 /* Or we checked on the embedded object and top offset was the
280 same as the embedded offset */
281 ((top_offset == VALUE_EMBEDDED_OFFSET (v)) &&
283 TYPE_LENGTH (VALUE_ENCLOSING_TYPE (v)) == TYPE_LENGTH (rtti_type))))
290 extern int gnuv2_baseclass_offset (struct type *type, int index,
291 char *valaddr, CORE_ADDR address);
294 init_hpacc_ops (void)
296 hpacc_abi_ops.shortname = "hpaCC";
297 hpacc_abi_ops.longname = "HP aCC ABI";
298 hpacc_abi_ops.doc = "HP aCC ABI";
299 hpacc_abi_ops.is_destructor_name = hpacc_is_destructor_name;
300 hpacc_abi_ops.is_constructor_name = hpacc_is_constructor_name;
301 hpacc_abi_ops.is_vtable_name = hpacc_is_vtable_name;
302 hpacc_abi_ops.is_operator_name = hpacc_is_operator_name;
303 hpacc_abi_ops.virtual_fn_field = hpacc_virtual_fn_field;
304 hpacc_abi_ops.rtti_type = hpacc_value_rtti_type;
305 /* It seems that this function is specific to GNU G++ < 3.0.
306 However, it is called for data members even in the HP
307 case (although not for member functions).
308 FIXME: Is that correct? */
309 hpacc_abi_ops.baseclass_offset = gnuv2_baseclass_offset;
312 extern initialize_file_ftype _initialize_hpacc_abi; /* -Wmissing-prototypes */
315 _initialize_hpacc_abi (void)
319 regcomp (&constructor_pattern,
320 "^This will never match anything, please fill it in$", REG_NOSUB);
322 regcomp (&destructor_pattern,
323 "^This will never match anything, please fill it in$", REG_NOSUB);
325 regcomp (&operator_pattern,
326 "^This will never match anything, please fill it in$", REG_NOSUB);
328 register_cp_abi (&hpacc_abi_ops);