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7ed49443 JB |
1 | /* Abstraction of GNU v3 abi. |
2 | Contributed by Jim Blandy <jimb@redhat.com> | |
451fbdda | 3 | |
42a4f53d | 4 | Copyright (C) 2001-2019 Free Software Foundation, Inc. |
7ed49443 JB |
5 | |
6 | This file is part of GDB. | |
7 | ||
a9762ec7 JB |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
7ed49443 JB |
12 | |
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
7ed49443 JB |
20 | |
21 | #include "defs.h" | |
22 | #include "value.h" | |
23 | #include "cp-abi.h" | |
362ff856 | 24 | #include "cp-support.h" |
7ed49443 | 25 | #include "demangle.h" |
b18be20d | 26 | #include "objfiles.h" |
0d5de010 | 27 | #include "valprint.h" |
94af9270 | 28 | #include "c-lang.h" |
79d43c61 | 29 | #include "typeprint.h" |
59d3651b | 30 | #include <algorithm> |
0d5de010 | 31 | |
b27b8843 | 32 | static struct cp_abi_ops gnu_v3_abi_ops; |
7ed49443 | 33 | |
6e72ca20 TT |
34 | /* A gdbarch key for std::type_info, in the event that it can't be |
35 | found in the debug info. */ | |
36 | ||
37 | static struct gdbarch_data *std_type_info_gdbarch_data; | |
38 | ||
39 | ||
7ed49443 JB |
40 | static int |
41 | gnuv3_is_vtable_name (const char *name) | |
42 | { | |
61012eef | 43 | return startswith (name, "_ZTV"); |
7ed49443 JB |
44 | } |
45 | ||
46 | static int | |
47 | gnuv3_is_operator_name (const char *name) | |
48 | { | |
8090b426 | 49 | return startswith (name, CP_OPERATOR_STR); |
7ed49443 JB |
50 | } |
51 | ||
52 | ||
53 | /* To help us find the components of a vtable, we build ourselves a | |
54 | GDB type object representing the vtable structure. Following the | |
55 | V3 ABI, it goes something like this: | |
56 | ||
57 | struct gdb_gnu_v3_abi_vtable { | |
58 | ||
59 | / * An array of virtual call and virtual base offsets. The real | |
60 | length of this array depends on the class hierarchy; we use | |
61 | negative subscripts to access the elements. Yucky, but | |
62 | better than the alternatives. * / | |
63 | ptrdiff_t vcall_and_vbase_offsets[0]; | |
64 | ||
65 | / * The offset from a virtual pointer referring to this table | |
66 | to the top of the complete object. * / | |
67 | ptrdiff_t offset_to_top; | |
68 | ||
69 | / * The type_info pointer for this class. This is really a | |
70 | std::type_info *, but GDB doesn't really look at the | |
71 | type_info object itself, so we don't bother to get the type | |
72 | exactly right. * / | |
73 | void *type_info; | |
74 | ||
75 | / * Virtual table pointers in objects point here. * / | |
76 | ||
77 | / * Virtual function pointers. Like the vcall/vbase array, the | |
78 | real length of this table depends on the class hierarchy. * / | |
79 | void (*virtual_functions[0]) (); | |
80 | ||
81 | }; | |
82 | ||
83 | The catch, of course, is that the exact layout of this table | |
84 | depends on the ABI --- word size, endianness, alignment, etc. So | |
85 | the GDB type object is actually a per-architecture kind of thing. | |
86 | ||
87 | vtable_type_gdbarch_data is a gdbarch per-architecture data pointer | |
88 | which refers to the struct type * for this structure, laid out | |
89 | appropriately for the architecture. */ | |
b27b8843 | 90 | static struct gdbarch_data *vtable_type_gdbarch_data; |
7ed49443 JB |
91 | |
92 | ||
93 | /* Human-readable names for the numbers of the fields above. */ | |
94 | enum { | |
95 | vtable_field_vcall_and_vbase_offsets, | |
96 | vtable_field_offset_to_top, | |
97 | vtable_field_type_info, | |
98 | vtable_field_virtual_functions | |
99 | }; | |
100 | ||
101 | ||
102 | /* Return a GDB type representing `struct gdb_gnu_v3_abi_vtable', | |
103 | described above, laid out appropriately for ARCH. | |
104 | ||
105 | We use this function as the gdbarch per-architecture data | |
9970f04b | 106 | initialization function. */ |
7ed49443 JB |
107 | static void * |
108 | build_gdb_vtable_type (struct gdbarch *arch) | |
109 | { | |
110 | struct type *t; | |
111 | struct field *field_list, *field; | |
112 | int offset; | |
113 | ||
114 | struct type *void_ptr_type | |
fde6c819 | 115 | = builtin_type (arch)->builtin_data_ptr; |
7ed49443 | 116 | struct type *ptr_to_void_fn_type |
fde6c819 | 117 | = builtin_type (arch)->builtin_func_ptr; |
7ed49443 JB |
118 | |
119 | /* ARCH can't give us the true ptrdiff_t type, so we guess. */ | |
120 | struct type *ptrdiff_type | |
e9bb382b | 121 | = arch_integer_type (arch, gdbarch_ptr_bit (arch), 0, "ptrdiff_t"); |
7ed49443 JB |
122 | |
123 | /* We assume no padding is necessary, since GDB doesn't know | |
124 | anything about alignment at the moment. If this assumption bites | |
125 | us, we should add a gdbarch method which, given a type, returns | |
126 | the alignment that type requires, and then use that here. */ | |
127 | ||
128 | /* Build the field list. */ | |
8d749320 | 129 | field_list = XCNEWVEC (struct field, 4); |
7ed49443 JB |
130 | field = &field_list[0]; |
131 | offset = 0; | |
132 | ||
133 | /* ptrdiff_t vcall_and_vbase_offsets[0]; */ | |
134 | FIELD_NAME (*field) = "vcall_and_vbase_offsets"; | |
e3506a9f | 135 | FIELD_TYPE (*field) = lookup_array_range_type (ptrdiff_type, 0, -1); |
f41f5e61 | 136 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
7ed49443 JB |
137 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); |
138 | field++; | |
139 | ||
140 | /* ptrdiff_t offset_to_top; */ | |
141 | FIELD_NAME (*field) = "offset_to_top"; | |
142 | FIELD_TYPE (*field) = ptrdiff_type; | |
f41f5e61 | 143 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
7ed49443 JB |
144 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); |
145 | field++; | |
146 | ||
147 | /* void *type_info; */ | |
148 | FIELD_NAME (*field) = "type_info"; | |
149 | FIELD_TYPE (*field) = void_ptr_type; | |
f41f5e61 | 150 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
7ed49443 JB |
151 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); |
152 | field++; | |
153 | ||
154 | /* void (*virtual_functions[0]) (); */ | |
155 | FIELD_NAME (*field) = "virtual_functions"; | |
e3506a9f | 156 | FIELD_TYPE (*field) = lookup_array_range_type (ptr_to_void_fn_type, 0, -1); |
f41f5e61 | 157 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
7ed49443 JB |
158 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); |
159 | field++; | |
160 | ||
161 | /* We assumed in the allocation above that there were four fields. */ | |
3d499020 | 162 | gdb_assert (field == (field_list + 4)); |
7ed49443 | 163 | |
77b7c781 | 164 | t = arch_type (arch, TYPE_CODE_STRUCT, offset * TARGET_CHAR_BIT, NULL); |
7ed49443 JB |
165 | TYPE_NFIELDS (t) = field - field_list; |
166 | TYPE_FIELDS (t) = field_list; | |
e86ca25f | 167 | TYPE_NAME (t) = "gdb_gnu_v3_abi_vtable"; |
e9bb382b | 168 | INIT_CPLUS_SPECIFIC (t); |
7ed49443 | 169 | |
706d0883 | 170 | return make_type_with_address_space (t, TYPE_INSTANCE_FLAG_CODE_SPACE); |
7ed49443 JB |
171 | } |
172 | ||
173 | ||
ed09d7da KB |
174 | /* Return the ptrdiff_t type used in the vtable type. */ |
175 | static struct type * | |
176 | vtable_ptrdiff_type (struct gdbarch *gdbarch) | |
177 | { | |
9a3c8263 SM |
178 | struct type *vtable_type |
179 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
ed09d7da KB |
180 | |
181 | /* The "offset_to_top" field has the appropriate (ptrdiff_t) type. */ | |
182 | return TYPE_FIELD_TYPE (vtable_type, vtable_field_offset_to_top); | |
183 | } | |
184 | ||
7ed49443 JB |
185 | /* Return the offset from the start of the imaginary `struct |
186 | gdb_gnu_v3_abi_vtable' object to the vtable's "address point" | |
187 | (i.e., where objects' virtual table pointers point). */ | |
188 | static int | |
ad4820ab | 189 | vtable_address_point_offset (struct gdbarch *gdbarch) |
7ed49443 | 190 | { |
9a3c8263 SM |
191 | struct type *vtable_type |
192 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
7ed49443 JB |
193 | |
194 | return (TYPE_FIELD_BITPOS (vtable_type, vtable_field_virtual_functions) | |
195 | / TARGET_CHAR_BIT); | |
196 | } | |
197 | ||
198 | ||
d48cc9dd DJ |
199 | /* Determine whether structure TYPE is a dynamic class. Cache the |
200 | result. */ | |
201 | ||
202 | static int | |
203 | gnuv3_dynamic_class (struct type *type) | |
204 | { | |
205 | int fieldnum, fieldelem; | |
206 | ||
f168693b | 207 | type = check_typedef (type); |
5f4ce105 DE |
208 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT |
209 | || TYPE_CODE (type) == TYPE_CODE_UNION); | |
210 | ||
211 | if (TYPE_CODE (type) == TYPE_CODE_UNION) | |
212 | return 0; | |
213 | ||
d48cc9dd DJ |
214 | if (TYPE_CPLUS_DYNAMIC (type)) |
215 | return TYPE_CPLUS_DYNAMIC (type) == 1; | |
216 | ||
217 | ALLOCATE_CPLUS_STRUCT_TYPE (type); | |
218 | ||
219 | for (fieldnum = 0; fieldnum < TYPE_N_BASECLASSES (type); fieldnum++) | |
220 | if (BASETYPE_VIA_VIRTUAL (type, fieldnum) | |
221 | || gnuv3_dynamic_class (TYPE_FIELD_TYPE (type, fieldnum))) | |
222 | { | |
223 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
224 | return 1; | |
225 | } | |
226 | ||
227 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) | |
228 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
229 | fieldelem++) | |
230 | { | |
231 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
232 | ||
233 | if (TYPE_FN_FIELD_VIRTUAL_P (f, fieldelem)) | |
234 | { | |
235 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
236 | return 1; | |
237 | } | |
238 | } | |
239 | ||
240 | TYPE_CPLUS_DYNAMIC (type) = -1; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | /* Find the vtable for a value of CONTAINER_TYPE located at | |
245 | CONTAINER_ADDR. Return a value of the correct vtable type for this | |
246 | architecture, or NULL if CONTAINER does not have a vtable. */ | |
247 | ||
248 | static struct value * | |
249 | gnuv3_get_vtable (struct gdbarch *gdbarch, | |
250 | struct type *container_type, CORE_ADDR container_addr) | |
251 | { | |
9a3c8263 SM |
252 | struct type *vtable_type |
253 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
d48cc9dd DJ |
254 | struct type *vtable_pointer_type; |
255 | struct value *vtable_pointer; | |
256 | CORE_ADDR vtable_address; | |
257 | ||
f168693b | 258 | container_type = check_typedef (container_type); |
5f4ce105 DE |
259 | gdb_assert (TYPE_CODE (container_type) == TYPE_CODE_STRUCT); |
260 | ||
d48cc9dd DJ |
261 | /* If this type does not have a virtual table, don't read the first |
262 | field. */ | |
5f4ce105 | 263 | if (!gnuv3_dynamic_class (container_type)) |
d48cc9dd DJ |
264 | return NULL; |
265 | ||
266 | /* We do not consult the debug information to find the virtual table. | |
267 | The ABI specifies that it is always at offset zero in any class, | |
268 | and debug information may not represent it. | |
269 | ||
270 | We avoid using value_contents on principle, because the object might | |
271 | be large. */ | |
272 | ||
273 | /* Find the type "pointer to virtual table". */ | |
274 | vtable_pointer_type = lookup_pointer_type (vtable_type); | |
275 | ||
276 | /* Load it from the start of the class. */ | |
277 | vtable_pointer = value_at (vtable_pointer_type, container_addr); | |
278 | vtable_address = value_as_address (vtable_pointer); | |
279 | ||
280 | /* Correct it to point at the start of the virtual table, rather | |
281 | than the address point. */ | |
282 | return value_at_lazy (vtable_type, | |
0963b4bd MS |
283 | vtable_address |
284 | - vtable_address_point_offset (gdbarch)); | |
d48cc9dd DJ |
285 | } |
286 | ||
287 | ||
7ed49443 JB |
288 | static struct type * |
289 | gnuv3_rtti_type (struct value *value, | |
6b850546 | 290 | int *full_p, LONGEST *top_p, int *using_enc_p) |
7ed49443 | 291 | { |
ad4820ab | 292 | struct gdbarch *gdbarch; |
df407dfe | 293 | struct type *values_type = check_typedef (value_type (value)); |
7ed49443 JB |
294 | struct value *vtable; |
295 | struct minimal_symbol *vtable_symbol; | |
296 | const char *vtable_symbol_name; | |
297 | const char *class_name; | |
7ed49443 JB |
298 | struct type *run_time_type; |
299 | LONGEST offset_to_top; | |
e6a959d6 | 300 | const char *atsign; |
7ed49443 | 301 | |
e95a97d4 AA |
302 | /* We only have RTTI for dynamic class objects. */ |
303 | if (TYPE_CODE (values_type) != TYPE_CODE_STRUCT | |
304 | || !gnuv3_dynamic_class (values_type)) | |
7ed49443 JB |
305 | return NULL; |
306 | ||
ad4820ab | 307 | /* Determine architecture. */ |
50810684 | 308 | gdbarch = get_type_arch (values_type); |
7ed49443 | 309 | |
21cfb3b6 DJ |
310 | if (using_enc_p) |
311 | *using_enc_p = 0; | |
312 | ||
5f4ce105 | 313 | vtable = gnuv3_get_vtable (gdbarch, values_type, |
d48cc9dd DJ |
314 | value_as_address (value_addr (value))); |
315 | if (vtable == NULL) | |
316 | return NULL; | |
317 | ||
7ed49443 JB |
318 | /* Find the linker symbol for this vtable. */ |
319 | vtable_symbol | |
42ae5230 | 320 | = lookup_minimal_symbol_by_pc (value_address (vtable) |
7cbd4a93 | 321 | + value_embedded_offset (vtable)).minsym; |
7ed49443 JB |
322 | if (! vtable_symbol) |
323 | return NULL; | |
324 | ||
325 | /* The symbol's demangled name should be something like "vtable for | |
326 | CLASS", where CLASS is the name of the run-time type of VALUE. | |
327 | If we didn't like this approach, we could instead look in the | |
328 | type_info object itself to get the class name. But this way | |
329 | should work just as well, and doesn't read target memory. */ | |
efd66ac6 | 330 | vtable_symbol_name = MSYMBOL_DEMANGLED_NAME (vtable_symbol); |
98081e55 | 331 | if (vtable_symbol_name == NULL |
61012eef | 332 | || !startswith (vtable_symbol_name, "vtable for ")) |
f773fdbb | 333 | { |
8a3fe4f8 | 334 | warning (_("can't find linker symbol for virtual table for `%s' value"), |
0a07729b | 335 | TYPE_SAFE_NAME (values_type)); |
f773fdbb | 336 | if (vtable_symbol_name) |
8a3fe4f8 | 337 | warning (_(" found `%s' instead"), vtable_symbol_name); |
f773fdbb JM |
338 | return NULL; |
339 | } | |
7ed49443 JB |
340 | class_name = vtable_symbol_name + 11; |
341 | ||
8de20a37 TT |
342 | /* Strip off @plt and version suffixes. */ |
343 | atsign = strchr (class_name, '@'); | |
344 | if (atsign != NULL) | |
345 | { | |
346 | char *copy; | |
347 | ||
224c3ddb | 348 | copy = (char *) alloca (atsign - class_name + 1); |
8de20a37 TT |
349 | memcpy (copy, class_name, atsign - class_name); |
350 | copy[atsign - class_name] = '\0'; | |
351 | class_name = copy; | |
352 | } | |
353 | ||
7ed49443 | 354 | /* Try to look up the class name as a type name. */ |
0963b4bd | 355 | /* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */ |
362ff856 MC |
356 | run_time_type = cp_lookup_rtti_type (class_name, NULL); |
357 | if (run_time_type == NULL) | |
358 | return NULL; | |
7ed49443 JB |
359 | |
360 | /* Get the offset from VALUE to the top of the complete object. | |
361 | NOTE: this is the reverse of the meaning of *TOP_P. */ | |
362 | offset_to_top | |
363 | = value_as_long (value_field (vtable, vtable_field_offset_to_top)); | |
364 | ||
365 | if (full_p) | |
13c3b5f5 | 366 | *full_p = (- offset_to_top == value_embedded_offset (value) |
4754a64e | 367 | && (TYPE_LENGTH (value_enclosing_type (value)) |
7ed49443 JB |
368 | >= TYPE_LENGTH (run_time_type))); |
369 | if (top_p) | |
370 | *top_p = - offset_to_top; | |
7ed49443 JB |
371 | return run_time_type; |
372 | } | |
373 | ||
0d5de010 DJ |
374 | /* Return a function pointer for CONTAINER's VTABLE_INDEX'th virtual |
375 | function, of type FNTYPE. */ | |
7ed49443 | 376 | |
0d5de010 | 377 | static struct value * |
ad4820ab UW |
378 | gnuv3_get_virtual_fn (struct gdbarch *gdbarch, struct value *container, |
379 | struct type *fntype, int vtable_index) | |
0d5de010 | 380 | { |
d48cc9dd DJ |
381 | struct value *vtable, *vfn; |
382 | ||
383 | /* Every class with virtual functions must have a vtable. */ | |
384 | vtable = gnuv3_get_vtable (gdbarch, value_type (container), | |
385 | value_as_address (value_addr (container))); | |
386 | gdb_assert (vtable != NULL); | |
7ed49443 JB |
387 | |
388 | /* Fetch the appropriate function pointer from the vtable. */ | |
389 | vfn = value_subscript (value_field (vtable, vtable_field_virtual_functions), | |
2497b498 | 390 | vtable_index); |
7ed49443 | 391 | |
0d5de010 DJ |
392 | /* If this architecture uses function descriptors directly in the vtable, |
393 | then the address of the vtable entry is actually a "function pointer" | |
394 | (i.e. points to the descriptor). We don't need to scale the index | |
395 | by the size of a function descriptor; GCC does that before outputing | |
396 | debug information. */ | |
ad4820ab | 397 | if (gdbarch_vtable_function_descriptors (gdbarch)) |
0d5de010 | 398 | vfn = value_addr (vfn); |
7ed49443 | 399 | |
0d5de010 DJ |
400 | /* Cast the function pointer to the appropriate type. */ |
401 | vfn = value_cast (lookup_pointer_type (fntype), vfn); | |
76b79d6e | 402 | |
7ed49443 JB |
403 | return vfn; |
404 | } | |
405 | ||
0d5de010 DJ |
406 | /* GNU v3 implementation of value_virtual_fn_field. See cp-abi.h |
407 | for a description of the arguments. */ | |
408 | ||
409 | static struct value * | |
410 | gnuv3_virtual_fn_field (struct value **value_p, | |
411 | struct fn_field *f, int j, | |
412 | struct type *vfn_base, int offset) | |
413 | { | |
414 | struct type *values_type = check_typedef (value_type (*value_p)); | |
ad4820ab | 415 | struct gdbarch *gdbarch; |
0d5de010 DJ |
416 | |
417 | /* Some simple sanity checks. */ | |
4753d33b | 418 | if (TYPE_CODE (values_type) != TYPE_CODE_STRUCT) |
0d5de010 DJ |
419 | error (_("Only classes can have virtual functions.")); |
420 | ||
ad4820ab | 421 | /* Determine architecture. */ |
50810684 | 422 | gdbarch = get_type_arch (values_type); |
ad4820ab | 423 | |
0d5de010 DJ |
424 | /* Cast our value to the base class which defines this virtual |
425 | function. This takes care of any necessary `this' | |
426 | adjustments. */ | |
427 | if (vfn_base != values_type) | |
428 | *value_p = value_cast (vfn_base, *value_p); | |
429 | ||
ad4820ab | 430 | return gnuv3_get_virtual_fn (gdbarch, *value_p, TYPE_FN_FIELD_TYPE (f, j), |
0d5de010 DJ |
431 | TYPE_FN_FIELD_VOFFSET (f, j)); |
432 | } | |
433 | ||
1514d34e DJ |
434 | /* Compute the offset of the baseclass which is |
435 | the INDEXth baseclass of class TYPE, | |
436 | for value at VALADDR (in host) at ADDRESS (in target). | |
437 | The result is the offset of the baseclass value relative | |
438 | to (the address of)(ARG) + OFFSET. | |
439 | ||
0963b4bd MS |
440 | -1 is returned on error. */ |
441 | ||
b9362cc7 | 442 | static int |
8af8e3bc | 443 | gnuv3_baseclass_offset (struct type *type, int index, |
6b850546 | 444 | const bfd_byte *valaddr, LONGEST embedded_offset, |
8af8e3bc | 445 | CORE_ADDR address, const struct value *val) |
1514d34e | 446 | { |
ad4820ab | 447 | struct gdbarch *gdbarch; |
ad4820ab | 448 | struct type *ptr_type; |
79d5b63a | 449 | struct value *vtable; |
2497b498 | 450 | struct value *vbase_array; |
1514d34e | 451 | long int cur_base_offset, base_offset; |
1514d34e | 452 | |
ad4820ab | 453 | /* Determine architecture. */ |
50810684 | 454 | gdbarch = get_type_arch (type); |
ad4820ab UW |
455 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
456 | ||
1514d34e | 457 | /* If it isn't a virtual base, this is easy. The offset is in the |
9c37b5ae TT |
458 | type definition. */ |
459 | if (!BASETYPE_VIA_VIRTUAL (type, index)) | |
1514d34e DJ |
460 | return TYPE_BASECLASS_BITPOS (type, index) / 8; |
461 | ||
462 | /* To access a virtual base, we need to use the vbase offset stored in | |
463 | our vtable. Recent GCC versions provide this information. If it isn't | |
464 | available, we could get what we needed from RTTI, or from drawing the | |
465 | complete inheritance graph based on the debug info. Neither is | |
466 | worthwhile. */ | |
467 | cur_base_offset = TYPE_BASECLASS_BITPOS (type, index) / 8; | |
ad4820ab | 468 | if (cur_base_offset >= - vtable_address_point_offset (gdbarch)) |
8a3fe4f8 | 469 | error (_("Expected a negative vbase offset (old compiler?)")); |
1514d34e | 470 | |
ad4820ab UW |
471 | cur_base_offset = cur_base_offset + vtable_address_point_offset (gdbarch); |
472 | if ((- cur_base_offset) % TYPE_LENGTH (ptr_type) != 0) | |
8a3fe4f8 | 473 | error (_("Misaligned vbase offset.")); |
ad4820ab | 474 | cur_base_offset = cur_base_offset / ((int) TYPE_LENGTH (ptr_type)); |
1514d34e | 475 | |
8af8e3bc | 476 | vtable = gnuv3_get_vtable (gdbarch, type, address + embedded_offset); |
d48cc9dd | 477 | gdb_assert (vtable != NULL); |
1514d34e | 478 | vbase_array = value_field (vtable, vtable_field_vcall_and_vbase_offsets); |
2497b498 | 479 | base_offset = value_as_long (value_subscript (vbase_array, cur_base_offset)); |
1514d34e DJ |
480 | return base_offset; |
481 | } | |
7ed49443 | 482 | |
0d5de010 DJ |
483 | /* Locate a virtual method in DOMAIN or its non-virtual base classes |
484 | which has virtual table index VOFFSET. The method has an associated | |
485 | "this" adjustment of ADJUSTMENT bytes. */ | |
486 | ||
2c0b251b | 487 | static const char * |
0d5de010 DJ |
488 | gnuv3_find_method_in (struct type *domain, CORE_ADDR voffset, |
489 | LONGEST adjustment) | |
490 | { | |
491 | int i; | |
0d5de010 DJ |
492 | |
493 | /* Search this class first. */ | |
0d5de010 DJ |
494 | if (adjustment == 0) |
495 | { | |
496 | int len; | |
497 | ||
498 | len = TYPE_NFN_FIELDS (domain); | |
499 | for (i = 0; i < len; i++) | |
500 | { | |
501 | int len2, j; | |
502 | struct fn_field *f; | |
503 | ||
504 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
505 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
506 | ||
507 | check_stub_method_group (domain, i); | |
508 | for (j = 0; j < len2; j++) | |
509 | if (TYPE_FN_FIELD_VOFFSET (f, j) == voffset) | |
510 | return TYPE_FN_FIELD_PHYSNAME (f, j); | |
511 | } | |
512 | } | |
513 | ||
514 | /* Next search non-virtual bases. If it's in a virtual base, | |
515 | we're out of luck. */ | |
516 | for (i = 0; i < TYPE_N_BASECLASSES (domain); i++) | |
517 | { | |
518 | int pos; | |
519 | struct type *basetype; | |
520 | ||
521 | if (BASETYPE_VIA_VIRTUAL (domain, i)) | |
522 | continue; | |
523 | ||
524 | pos = TYPE_BASECLASS_BITPOS (domain, i) / 8; | |
525 | basetype = TYPE_FIELD_TYPE (domain, i); | |
526 | /* Recurse with a modified adjustment. We don't need to adjust | |
527 | voffset. */ | |
528 | if (adjustment >= pos && adjustment < pos + TYPE_LENGTH (basetype)) | |
529 | return gnuv3_find_method_in (basetype, voffset, adjustment - pos); | |
530 | } | |
531 | ||
532 | return NULL; | |
533 | } | |
534 | ||
fead6908 UW |
535 | /* Decode GNU v3 method pointer. */ |
536 | ||
537 | static int | |
ad4820ab UW |
538 | gnuv3_decode_method_ptr (struct gdbarch *gdbarch, |
539 | const gdb_byte *contents, | |
fead6908 UW |
540 | CORE_ADDR *value_p, |
541 | LONGEST *adjustment_p) | |
542 | { | |
ad4820ab | 543 | struct type *funcptr_type = builtin_type (gdbarch)->builtin_func_ptr; |
ed09d7da | 544 | struct type *offset_type = vtable_ptrdiff_type (gdbarch); |
e17a4113 | 545 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
fead6908 UW |
546 | CORE_ADDR ptr_value; |
547 | LONGEST voffset, adjustment; | |
548 | int vbit; | |
549 | ||
550 | /* Extract the pointer to member. The first element is either a pointer | |
551 | or a vtable offset. For pointers, we need to use extract_typed_address | |
552 | to allow the back-end to convert the pointer to a GDB address -- but | |
553 | vtable offsets we must handle as integers. At this point, we do not | |
554 | yet know which case we have, so we extract the value under both | |
555 | interpretations and choose the right one later on. */ | |
556 | ptr_value = extract_typed_address (contents, funcptr_type); | |
e17a4113 UW |
557 | voffset = extract_signed_integer (contents, |
558 | TYPE_LENGTH (funcptr_type), byte_order); | |
fead6908 | 559 | contents += TYPE_LENGTH (funcptr_type); |
e17a4113 UW |
560 | adjustment = extract_signed_integer (contents, |
561 | TYPE_LENGTH (offset_type), byte_order); | |
fead6908 | 562 | |
ad4820ab | 563 | if (!gdbarch_vbit_in_delta (gdbarch)) |
fead6908 UW |
564 | { |
565 | vbit = voffset & 1; | |
566 | voffset = voffset ^ vbit; | |
567 | } | |
568 | else | |
569 | { | |
570 | vbit = adjustment & 1; | |
571 | adjustment = adjustment >> 1; | |
572 | } | |
573 | ||
574 | *value_p = vbit? voffset : ptr_value; | |
575 | *adjustment_p = adjustment; | |
576 | return vbit; | |
577 | } | |
578 | ||
0d5de010 DJ |
579 | /* GNU v3 implementation of cplus_print_method_ptr. */ |
580 | ||
581 | static void | |
582 | gnuv3_print_method_ptr (const gdb_byte *contents, | |
583 | struct type *type, | |
584 | struct ui_file *stream) | |
585 | { | |
09e2d7c7 DE |
586 | struct type *self_type = TYPE_SELF_TYPE (type); |
587 | struct gdbarch *gdbarch = get_type_arch (self_type); | |
0d5de010 DJ |
588 | CORE_ADDR ptr_value; |
589 | LONGEST adjustment; | |
0d5de010 DJ |
590 | int vbit; |
591 | ||
0d5de010 | 592 | /* Extract the pointer to member. */ |
ad4820ab | 593 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
594 | |
595 | /* Check for NULL. */ | |
596 | if (ptr_value == 0 && vbit == 0) | |
597 | { | |
598 | fprintf_filtered (stream, "NULL"); | |
599 | return; | |
600 | } | |
601 | ||
602 | /* Search for a virtual method. */ | |
603 | if (vbit) | |
604 | { | |
605 | CORE_ADDR voffset; | |
606 | const char *physname; | |
607 | ||
608 | /* It's a virtual table offset, maybe in this class. Search | |
609 | for a field with the correct vtable offset. First convert it | |
610 | to an index, as used in TYPE_FN_FIELD_VOFFSET. */ | |
ed09d7da | 611 | voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch)); |
0d5de010 | 612 | |
09e2d7c7 | 613 | physname = gnuv3_find_method_in (self_type, voffset, adjustment); |
0d5de010 DJ |
614 | |
615 | /* If we found a method, print that. We don't bother to disambiguate | |
616 | possible paths to the method based on the adjustment. */ | |
617 | if (physname) | |
618 | { | |
8de20a37 TT |
619 | char *demangled_name = gdb_demangle (physname, |
620 | DMGL_ANSI | DMGL_PARAMS); | |
d8734c88 | 621 | |
94af9270 KS |
622 | fprintf_filtered (stream, "&virtual "); |
623 | if (demangled_name == NULL) | |
624 | fputs_filtered (physname, stream); | |
625 | else | |
0d5de010 | 626 | { |
0d5de010 DJ |
627 | fputs_filtered (demangled_name, stream); |
628 | xfree (demangled_name); | |
0d5de010 | 629 | } |
94af9270 | 630 | return; |
0d5de010 DJ |
631 | } |
632 | } | |
94af9270 KS |
633 | else if (ptr_value != 0) |
634 | { | |
635 | /* Found a non-virtual function: print out the type. */ | |
636 | fputs_filtered ("(", stream); | |
79d43c61 | 637 | c_print_type (type, "", stream, -1, 0, &type_print_raw_options); |
94af9270 KS |
638 | fputs_filtered (") ", stream); |
639 | } | |
0d5de010 DJ |
640 | |
641 | /* We didn't find it; print the raw data. */ | |
642 | if (vbit) | |
643 | { | |
644 | fprintf_filtered (stream, "&virtual table offset "); | |
645 | print_longest (stream, 'd', 1, ptr_value); | |
646 | } | |
647 | else | |
edf0c1b7 TT |
648 | { |
649 | struct value_print_options opts; | |
650 | ||
651 | get_user_print_options (&opts); | |
652 | print_address_demangle (&opts, gdbarch, ptr_value, stream, demangle); | |
653 | } | |
0d5de010 DJ |
654 | |
655 | if (adjustment) | |
656 | { | |
657 | fprintf_filtered (stream, ", this adjustment "); | |
658 | print_longest (stream, 'd', 1, adjustment); | |
659 | } | |
660 | } | |
661 | ||
662 | /* GNU v3 implementation of cplus_method_ptr_size. */ | |
663 | ||
664 | static int | |
ad4820ab | 665 | gnuv3_method_ptr_size (struct type *type) |
0d5de010 | 666 | { |
561d3825 | 667 | struct gdbarch *gdbarch = get_type_arch (type); |
d8734c88 | 668 | |
ad4820ab | 669 | return 2 * TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr); |
0d5de010 DJ |
670 | } |
671 | ||
672 | /* GNU v3 implementation of cplus_make_method_ptr. */ | |
673 | ||
674 | static void | |
ad4820ab UW |
675 | gnuv3_make_method_ptr (struct type *type, gdb_byte *contents, |
676 | CORE_ADDR value, int is_virtual) | |
0d5de010 | 677 | { |
561d3825 | 678 | struct gdbarch *gdbarch = get_type_arch (type); |
ad4820ab | 679 | int size = TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr); |
e17a4113 | 680 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0d5de010 DJ |
681 | |
682 | /* FIXME drow/2006-12-24: The adjustment of "this" is currently | |
683 | always zero, since the method pointer is of the correct type. | |
684 | But if the method pointer came from a base class, this is | |
685 | incorrect - it should be the offset to the base. The best | |
686 | fix might be to create the pointer to member pointing at the | |
687 | base class and cast it to the derived class, but that requires | |
688 | support for adjusting pointers to members when casting them - | |
689 | not currently supported by GDB. */ | |
690 | ||
ad4820ab | 691 | if (!gdbarch_vbit_in_delta (gdbarch)) |
0d5de010 | 692 | { |
e17a4113 UW |
693 | store_unsigned_integer (contents, size, byte_order, value | is_virtual); |
694 | store_unsigned_integer (contents + size, size, byte_order, 0); | |
0d5de010 DJ |
695 | } |
696 | else | |
697 | { | |
e17a4113 UW |
698 | store_unsigned_integer (contents, size, byte_order, value); |
699 | store_unsigned_integer (contents + size, size, byte_order, is_virtual); | |
0d5de010 DJ |
700 | } |
701 | } | |
702 | ||
703 | /* GNU v3 implementation of cplus_method_ptr_to_value. */ | |
704 | ||
705 | static struct value * | |
706 | gnuv3_method_ptr_to_value (struct value **this_p, struct value *method_ptr) | |
707 | { | |
ad4820ab | 708 | struct gdbarch *gdbarch; |
0d5de010 DJ |
709 | const gdb_byte *contents = value_contents (method_ptr); |
710 | CORE_ADDR ptr_value; | |
09e2d7c7 | 711 | struct type *self_type, *final_type, *method_type; |
0d5de010 | 712 | LONGEST adjustment; |
0d5de010 DJ |
713 | int vbit; |
714 | ||
09e2d7c7 DE |
715 | self_type = TYPE_SELF_TYPE (check_typedef (value_type (method_ptr))); |
716 | final_type = lookup_pointer_type (self_type); | |
0d5de010 DJ |
717 | |
718 | method_type = TYPE_TARGET_TYPE (check_typedef (value_type (method_ptr))); | |
719 | ||
fead6908 | 720 | /* Extract the pointer to member. */ |
09e2d7c7 | 721 | gdbarch = get_type_arch (self_type); |
ad4820ab | 722 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
723 | |
724 | /* First convert THIS to match the containing type of the pointer to | |
725 | member. This cast may adjust the value of THIS. */ | |
726 | *this_p = value_cast (final_type, *this_p); | |
727 | ||
728 | /* Then apply whatever adjustment is necessary. This creates a somewhat | |
729 | strange pointer: it claims to have type FINAL_TYPE, but in fact it | |
730 | might not be a valid FINAL_TYPE. For instance, it might be a | |
731 | base class of FINAL_TYPE. And if it's not the primary base class, | |
732 | then printing it out as a FINAL_TYPE object would produce some pretty | |
733 | garbage. | |
734 | ||
735 | But we don't really know the type of the first argument in | |
736 | METHOD_TYPE either, which is why this happens. We can't | |
737 | dereference this later as a FINAL_TYPE, but once we arrive in the | |
738 | called method we'll have debugging information for the type of | |
739 | "this" - and that'll match the value we produce here. | |
740 | ||
741 | You can provoke this case by casting a Base::* to a Derived::*, for | |
742 | instance. */ | |
ad4820ab | 743 | *this_p = value_cast (builtin_type (gdbarch)->builtin_data_ptr, *this_p); |
2497b498 | 744 | *this_p = value_ptradd (*this_p, adjustment); |
0d5de010 DJ |
745 | *this_p = value_cast (final_type, *this_p); |
746 | ||
747 | if (vbit) | |
748 | { | |
ad4820ab | 749 | LONGEST voffset; |
d8734c88 | 750 | |
ed09d7da | 751 | voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch)); |
ad4820ab UW |
752 | return gnuv3_get_virtual_fn (gdbarch, value_ind (*this_p), |
753 | method_type, voffset); | |
0d5de010 DJ |
754 | } |
755 | else | |
756 | return value_from_pointer (lookup_pointer_type (method_type), ptr_value); | |
757 | } | |
758 | ||
c4aeac85 TT |
759 | /* Objects of this type are stored in a hash table and a vector when |
760 | printing the vtables for a class. */ | |
761 | ||
762 | struct value_and_voffset | |
763 | { | |
764 | /* The value representing the object. */ | |
765 | struct value *value; | |
766 | ||
767 | /* The maximum vtable offset we've found for any object at this | |
768 | offset in the outermost object. */ | |
769 | int max_voffset; | |
770 | }; | |
771 | ||
c4aeac85 TT |
772 | /* Hash function for value_and_voffset. */ |
773 | ||
774 | static hashval_t | |
775 | hash_value_and_voffset (const void *p) | |
776 | { | |
9a3c8263 | 777 | const struct value_and_voffset *o = (const struct value_and_voffset *) p; |
c4aeac85 TT |
778 | |
779 | return value_address (o->value) + value_embedded_offset (o->value); | |
780 | } | |
781 | ||
782 | /* Equality function for value_and_voffset. */ | |
783 | ||
784 | static int | |
785 | eq_value_and_voffset (const void *a, const void *b) | |
786 | { | |
9a3c8263 SM |
787 | const struct value_and_voffset *ova = (const struct value_and_voffset *) a; |
788 | const struct value_and_voffset *ovb = (const struct value_and_voffset *) b; | |
c4aeac85 TT |
789 | |
790 | return (value_address (ova->value) + value_embedded_offset (ova->value) | |
791 | == value_address (ovb->value) + value_embedded_offset (ovb->value)); | |
792 | } | |
793 | ||
59d3651b | 794 | /* Comparison function for value_and_voffset. */ |
c4aeac85 | 795 | |
59d3651b TT |
796 | static bool |
797 | compare_value_and_voffset (const struct value_and_voffset *va, | |
798 | const struct value_and_voffset *vb) | |
c4aeac85 | 799 | { |
59d3651b TT |
800 | CORE_ADDR addra = (value_address (va->value) |
801 | + value_embedded_offset (va->value)); | |
802 | CORE_ADDR addrb = (value_address (vb->value) | |
803 | + value_embedded_offset (vb->value)); | |
804 | ||
805 | return addra < addrb; | |
c4aeac85 TT |
806 | } |
807 | ||
808 | /* A helper function used when printing vtables. This determines the | |
809 | key (most derived) sub-object at each address and also computes the | |
810 | maximum vtable offset seen for the corresponding vtable. Updates | |
811 | OFFSET_HASH and OFFSET_VEC with a new value_and_voffset object, if | |
812 | needed. VALUE is the object to examine. */ | |
813 | ||
814 | static void | |
815 | compute_vtable_size (htab_t offset_hash, | |
59d3651b | 816 | std::vector<value_and_voffset *> *offset_vec, |
c4aeac85 TT |
817 | struct value *value) |
818 | { | |
819 | int i; | |
820 | struct type *type = check_typedef (value_type (value)); | |
821 | void **slot; | |
822 | struct value_and_voffset search_vo, *current_vo; | |
c4aeac85 | 823 | |
5f4ce105 DE |
824 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT); |
825 | ||
c4aeac85 TT |
826 | /* If the object is not dynamic, then we are done; as it cannot have |
827 | dynamic base types either. */ | |
828 | if (!gnuv3_dynamic_class (type)) | |
829 | return; | |
830 | ||
831 | /* Update the hash and the vec, if needed. */ | |
832 | search_vo.value = value; | |
833 | slot = htab_find_slot (offset_hash, &search_vo, INSERT); | |
834 | if (*slot) | |
9a3c8263 | 835 | current_vo = (struct value_and_voffset *) *slot; |
c4aeac85 TT |
836 | else |
837 | { | |
838 | current_vo = XNEW (struct value_and_voffset); | |
839 | current_vo->value = value; | |
840 | current_vo->max_voffset = -1; | |
841 | *slot = current_vo; | |
59d3651b | 842 | offset_vec->push_back (current_vo); |
c4aeac85 TT |
843 | } |
844 | ||
845 | /* Update the value_and_voffset object with the highest vtable | |
846 | offset from this class. */ | |
847 | for (i = 0; i < TYPE_NFN_FIELDS (type); ++i) | |
848 | { | |
849 | int j; | |
850 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, i); | |
851 | ||
852 | for (j = 0; j < TYPE_FN_FIELDLIST_LENGTH (type, i); ++j) | |
853 | { | |
854 | if (TYPE_FN_FIELD_VIRTUAL_P (fn, j)) | |
855 | { | |
856 | int voffset = TYPE_FN_FIELD_VOFFSET (fn, j); | |
857 | ||
858 | if (voffset > current_vo->max_voffset) | |
859 | current_vo->max_voffset = voffset; | |
860 | } | |
861 | } | |
862 | } | |
863 | ||
864 | /* Recurse into base classes. */ | |
865 | for (i = 0; i < TYPE_N_BASECLASSES (type); ++i) | |
866 | compute_vtable_size (offset_hash, offset_vec, value_field (value, i)); | |
867 | } | |
868 | ||
869 | /* Helper for gnuv3_print_vtable that prints a single vtable. */ | |
870 | ||
871 | static void | |
872 | print_one_vtable (struct gdbarch *gdbarch, struct value *value, | |
873 | int max_voffset, | |
874 | struct value_print_options *opts) | |
875 | { | |
876 | int i; | |
877 | struct type *type = check_typedef (value_type (value)); | |
878 | struct value *vtable; | |
879 | CORE_ADDR vt_addr; | |
880 | ||
881 | vtable = gnuv3_get_vtable (gdbarch, type, | |
882 | value_address (value) | |
883 | + value_embedded_offset (value)); | |
884 | vt_addr = value_address (value_field (vtable, | |
885 | vtable_field_virtual_functions)); | |
886 | ||
887 | printf_filtered (_("vtable for '%s' @ %s (subobject @ %s):\n"), | |
888 | TYPE_SAFE_NAME (type), | |
889 | paddress (gdbarch, vt_addr), | |
890 | paddress (gdbarch, (value_address (value) | |
891 | + value_embedded_offset (value)))); | |
892 | ||
893 | for (i = 0; i <= max_voffset; ++i) | |
894 | { | |
cafe75b0 JK |
895 | /* Initialize it just to avoid a GCC false warning. */ |
896 | CORE_ADDR addr = 0; | |
492d29ea | 897 | int got_error = 0; |
c4aeac85 | 898 | struct value *vfn; |
c4aeac85 TT |
899 | |
900 | printf_filtered ("[%d]: ", i); | |
901 | ||
902 | vfn = value_subscript (value_field (vtable, | |
903 | vtable_field_virtual_functions), | |
904 | i); | |
905 | ||
906 | if (gdbarch_vtable_function_descriptors (gdbarch)) | |
907 | vfn = value_addr (vfn); | |
908 | ||
492d29ea | 909 | TRY |
c4aeac85 TT |
910 | { |
911 | addr = value_as_address (vfn); | |
912 | } | |
492d29ea PA |
913 | CATCH (ex, RETURN_MASK_ERROR) |
914 | { | |
915 | printf_filtered (_("<error: %s>"), ex.message); | |
916 | got_error = 1; | |
917 | } | |
918 | END_CATCH | |
919 | ||
920 | if (!got_error) | |
edf0c1b7 | 921 | print_function_pointer_address (opts, gdbarch, addr, gdb_stdout); |
c4aeac85 TT |
922 | printf_filtered ("\n"); |
923 | } | |
924 | } | |
925 | ||
926 | /* Implementation of the print_vtable method. */ | |
927 | ||
928 | static void | |
929 | gnuv3_print_vtable (struct value *value) | |
930 | { | |
931 | struct gdbarch *gdbarch; | |
932 | struct type *type; | |
933 | struct value *vtable; | |
934 | struct value_print_options opts; | |
59d3651b | 935 | int count; |
c4aeac85 TT |
936 | |
937 | value = coerce_ref (value); | |
938 | type = check_typedef (value_type (value)); | |
939 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
940 | { | |
941 | value = value_ind (value); | |
942 | type = check_typedef (value_type (value)); | |
943 | } | |
944 | ||
945 | get_user_print_options (&opts); | |
946 | ||
947 | /* Respect 'set print object'. */ | |
948 | if (opts.objectprint) | |
949 | { | |
950 | value = value_full_object (value, NULL, 0, 0, 0); | |
951 | type = check_typedef (value_type (value)); | |
952 | } | |
953 | ||
954 | gdbarch = get_type_arch (type); | |
5f4ce105 DE |
955 | |
956 | vtable = NULL; | |
957 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT) | |
958 | vtable = gnuv3_get_vtable (gdbarch, type, | |
959 | value_as_address (value_addr (value))); | |
c4aeac85 TT |
960 | |
961 | if (!vtable) | |
962 | { | |
963 | printf_filtered (_("This object does not have a virtual function table\n")); | |
964 | return; | |
965 | } | |
966 | ||
fc4007c9 TT |
967 | htab_up offset_hash (htab_create_alloc (1, hash_value_and_voffset, |
968 | eq_value_and_voffset, | |
969 | xfree, xcalloc, xfree)); | |
59d3651b | 970 | std::vector<value_and_voffset *> result_vec; |
c4aeac85 | 971 | |
fc4007c9 | 972 | compute_vtable_size (offset_hash.get (), &result_vec, value); |
59d3651b TT |
973 | std::sort (result_vec.begin (), result_vec.end (), |
974 | compare_value_and_voffset); | |
c4aeac85 TT |
975 | |
976 | count = 0; | |
59d3651b | 977 | for (value_and_voffset *iter : result_vec) |
c4aeac85 TT |
978 | { |
979 | if (iter->max_voffset >= 0) | |
980 | { | |
981 | if (count > 0) | |
982 | printf_filtered ("\n"); | |
983 | print_one_vtable (gdbarch, iter->value, iter->max_voffset, &opts); | |
984 | ++count; | |
985 | } | |
986 | } | |
c4aeac85 TT |
987 | } |
988 | ||
6e72ca20 TT |
989 | /* Return a GDB type representing `struct std::type_info', laid out |
990 | appropriately for ARCH. | |
991 | ||
992 | We use this function as the gdbarch per-architecture data | |
993 | initialization function. */ | |
994 | ||
995 | static void * | |
996 | build_std_type_info_type (struct gdbarch *arch) | |
997 | { | |
998 | struct type *t; | |
999 | struct field *field_list, *field; | |
1000 | int offset; | |
1001 | struct type *void_ptr_type | |
1002 | = builtin_type (arch)->builtin_data_ptr; | |
1003 | struct type *char_type | |
1004 | = builtin_type (arch)->builtin_char; | |
1005 | struct type *char_ptr_type | |
1006 | = make_pointer_type (make_cv_type (1, 0, char_type, NULL), NULL); | |
1007 | ||
8d749320 | 1008 | field_list = XCNEWVEC (struct field, 2); |
6e72ca20 TT |
1009 | field = &field_list[0]; |
1010 | offset = 0; | |
1011 | ||
1012 | /* The vtable. */ | |
1013 | FIELD_NAME (*field) = "_vptr.type_info"; | |
1014 | FIELD_TYPE (*field) = void_ptr_type; | |
1015 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); | |
1016 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); | |
1017 | field++; | |
1018 | ||
1019 | /* The name. */ | |
1020 | FIELD_NAME (*field) = "__name"; | |
1021 | FIELD_TYPE (*field) = char_ptr_type; | |
1022 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); | |
1023 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); | |
1024 | field++; | |
1025 | ||
1026 | gdb_assert (field == (field_list + 2)); | |
1027 | ||
77b7c781 | 1028 | t = arch_type (arch, TYPE_CODE_STRUCT, offset * TARGET_CHAR_BIT, NULL); |
6e72ca20 TT |
1029 | TYPE_NFIELDS (t) = field - field_list; |
1030 | TYPE_FIELDS (t) = field_list; | |
e86ca25f | 1031 | TYPE_NAME (t) = "gdb_gnu_v3_type_info"; |
6e72ca20 TT |
1032 | INIT_CPLUS_SPECIFIC (t); |
1033 | ||
1034 | return t; | |
1035 | } | |
1036 | ||
1037 | /* Implement the 'get_typeid_type' method. */ | |
1038 | ||
1039 | static struct type * | |
1040 | gnuv3_get_typeid_type (struct gdbarch *gdbarch) | |
1041 | { | |
1042 | struct symbol *typeinfo; | |
1043 | struct type *typeinfo_type; | |
1044 | ||
d12307c1 PMR |
1045 | typeinfo = lookup_symbol ("std::type_info", NULL, STRUCT_DOMAIN, |
1046 | NULL).symbol; | |
6e72ca20 | 1047 | if (typeinfo == NULL) |
9a3c8263 SM |
1048 | typeinfo_type |
1049 | = (struct type *) gdbarch_data (gdbarch, std_type_info_gdbarch_data); | |
6e72ca20 TT |
1050 | else |
1051 | typeinfo_type = SYMBOL_TYPE (typeinfo); | |
1052 | ||
1053 | return typeinfo_type; | |
1054 | } | |
1055 | ||
1056 | /* Implement the 'get_typeid' method. */ | |
1057 | ||
1058 | static struct value * | |
1059 | gnuv3_get_typeid (struct value *value) | |
1060 | { | |
1061 | struct type *typeinfo_type; | |
1062 | struct type *type; | |
1063 | struct gdbarch *gdbarch; | |
6e72ca20 | 1064 | struct value *result; |
2f408ecb | 1065 | std::string type_name, canonical; |
6e72ca20 TT |
1066 | |
1067 | /* We have to handle values a bit trickily here, to allow this code | |
1068 | to work properly with non_lvalue values that are really just | |
1069 | disguised types. */ | |
1070 | if (value_lval_const (value) == lval_memory) | |
1071 | value = coerce_ref (value); | |
1072 | ||
1073 | type = check_typedef (value_type (value)); | |
1074 | ||
1075 | /* In the non_lvalue case, a reference might have slipped through | |
1076 | here. */ | |
1077 | if (TYPE_CODE (type) == TYPE_CODE_REF) | |
1078 | type = check_typedef (TYPE_TARGET_TYPE (type)); | |
1079 | ||
1080 | /* Ignore top-level cv-qualifiers. */ | |
1081 | type = make_cv_type (0, 0, type, NULL); | |
1082 | gdbarch = get_type_arch (type); | |
1083 | ||
fe978cb0 | 1084 | type_name = type_to_string (type); |
2f408ecb | 1085 | if (type_name.empty ()) |
6e72ca20 | 1086 | error (_("cannot find typeinfo for unnamed type")); |
6e72ca20 TT |
1087 | |
1088 | /* We need to canonicalize the type name here, because we do lookups | |
1089 | using the demangled name, and so we must match the format it | |
1090 | uses. E.g., GDB tends to use "const char *" as a type name, but | |
1091 | the demangler uses "char const *". */ | |
2f408ecb PA |
1092 | canonical = cp_canonicalize_string (type_name.c_str ()); |
1093 | if (!canonical.empty ()) | |
1094 | type_name = canonical; | |
6e72ca20 TT |
1095 | |
1096 | typeinfo_type = gnuv3_get_typeid_type (gdbarch); | |
1097 | ||
1098 | /* We check for lval_memory because in the "typeid (type-id)" case, | |
1099 | the type is passed via a not_lval value object. */ | |
4753d33b | 1100 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
6e72ca20 TT |
1101 | && value_lval_const (value) == lval_memory |
1102 | && gnuv3_dynamic_class (type)) | |
1103 | { | |
1104 | struct value *vtable, *typeinfo_value; | |
1105 | CORE_ADDR address = value_address (value) + value_embedded_offset (value); | |
1106 | ||
1107 | vtable = gnuv3_get_vtable (gdbarch, type, address); | |
1108 | if (vtable == NULL) | |
2f408ecb PA |
1109 | error (_("cannot find typeinfo for object of type '%s'"), |
1110 | type_name.c_str ()); | |
6e72ca20 TT |
1111 | typeinfo_value = value_field (vtable, vtable_field_type_info); |
1112 | result = value_ind (value_cast (make_pointer_type (typeinfo_type, NULL), | |
1113 | typeinfo_value)); | |
1114 | } | |
1115 | else | |
1116 | { | |
2f408ecb PA |
1117 | std::string sym_name = std::string ("typeinfo for ") + type_name; |
1118 | bound_minimal_symbol minsym | |
1119 | = lookup_minimal_symbol (sym_name.c_str (), NULL, NULL); | |
6e72ca20 | 1120 | |
3b7344d5 | 1121 | if (minsym.minsym == NULL) |
2f408ecb | 1122 | error (_("could not find typeinfo symbol for '%s'"), type_name.c_str ()); |
6e72ca20 | 1123 | |
77e371c0 | 1124 | result = value_at_lazy (typeinfo_type, BMSYMBOL_VALUE_ADDRESS (minsym)); |
6e72ca20 TT |
1125 | } |
1126 | ||
6e72ca20 TT |
1127 | return result; |
1128 | } | |
1129 | ||
cc16e6c9 | 1130 | /* Implement the 'get_typename_from_type_info' method. */ |
72f1fe8a | 1131 | |
2f408ecb | 1132 | static std::string |
72f1fe8a TT |
1133 | gnuv3_get_typename_from_type_info (struct value *type_info_ptr) |
1134 | { | |
1135 | struct gdbarch *gdbarch = get_type_arch (value_type (type_info_ptr)); | |
1136 | struct bound_minimal_symbol typeinfo_sym; | |
1137 | CORE_ADDR addr; | |
1138 | const char *symname; | |
1139 | const char *class_name; | |
1140 | const char *atsign; | |
1141 | ||
1142 | addr = value_as_address (type_info_ptr); | |
1143 | typeinfo_sym = lookup_minimal_symbol_by_pc (addr); | |
1144 | if (typeinfo_sym.minsym == NULL) | |
1145 | error (_("could not find minimal symbol for typeinfo address %s"), | |
1146 | paddress (gdbarch, addr)); | |
1147 | ||
1148 | #define TYPEINFO_PREFIX "typeinfo for " | |
1149 | #define TYPEINFO_PREFIX_LEN (sizeof (TYPEINFO_PREFIX) - 1) | |
efd66ac6 | 1150 | symname = MSYMBOL_DEMANGLED_NAME (typeinfo_sym.minsym); |
72f1fe8a TT |
1151 | if (symname == NULL || strncmp (symname, TYPEINFO_PREFIX, |
1152 | TYPEINFO_PREFIX_LEN)) | |
1153 | error (_("typeinfo symbol '%s' has unexpected name"), | |
efd66ac6 | 1154 | MSYMBOL_LINKAGE_NAME (typeinfo_sym.minsym)); |
72f1fe8a TT |
1155 | class_name = symname + TYPEINFO_PREFIX_LEN; |
1156 | ||
1157 | /* Strip off @plt and version suffixes. */ | |
1158 | atsign = strchr (class_name, '@'); | |
1159 | if (atsign != NULL) | |
2f408ecb PA |
1160 | return std::string (class_name, atsign - class_name); |
1161 | return class_name; | |
72f1fe8a TT |
1162 | } |
1163 | ||
1164 | /* Implement the 'get_type_from_type_info' method. */ | |
1165 | ||
1166 | static struct type * | |
1167 | gnuv3_get_type_from_type_info (struct value *type_info_ptr) | |
1168 | { | |
72f1fe8a TT |
1169 | /* We have to parse the type name, since in general there is not a |
1170 | symbol for a type. This is somewhat bogus since there may be a | |
1171 | mis-parse. Another approach might be to re-use the demangler's | |
1172 | internal form to reconstruct the type somehow. */ | |
2f408ecb PA |
1173 | std::string type_name = gnuv3_get_typename_from_type_info (type_info_ptr); |
1174 | expression_up expr (parse_expression (type_name.c_str ())); | |
1175 | struct value *type_val = evaluate_type (expr.get ()); | |
1176 | return value_type (type_val); | |
72f1fe8a TT |
1177 | } |
1178 | ||
b18be20d DJ |
1179 | /* Determine if we are currently in a C++ thunk. If so, get the address |
1180 | of the routine we are thunking to and continue to there instead. */ | |
1181 | ||
1182 | static CORE_ADDR | |
52f729a7 | 1183 | gnuv3_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc) |
b18be20d | 1184 | { |
a513d1e8 | 1185 | CORE_ADDR real_stop_pc, method_stop_pc, func_addr; |
9970f04b | 1186 | struct gdbarch *gdbarch = get_frame_arch (frame); |
3b7344d5 | 1187 | struct bound_minimal_symbol thunk_sym, fn_sym; |
b18be20d | 1188 | struct obj_section *section; |
0d5cff50 | 1189 | const char *thunk_name, *fn_name; |
b18be20d | 1190 | |
9970f04b | 1191 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
b18be20d DJ |
1192 | if (real_stop_pc == 0) |
1193 | real_stop_pc = stop_pc; | |
1194 | ||
1195 | /* Find the linker symbol for this potential thunk. */ | |
3b7344d5 | 1196 | thunk_sym = lookup_minimal_symbol_by_pc (real_stop_pc); |
b18be20d | 1197 | section = find_pc_section (real_stop_pc); |
3b7344d5 | 1198 | if (thunk_sym.minsym == NULL || section == NULL) |
b18be20d DJ |
1199 | return 0; |
1200 | ||
1201 | /* The symbol's demangled name should be something like "virtual | |
1202 | thunk to FUNCTION", where FUNCTION is the name of the function | |
1203 | being thunked to. */ | |
3b7344d5 | 1204 | thunk_name = MSYMBOL_DEMANGLED_NAME (thunk_sym.minsym); |
b18be20d DJ |
1205 | if (thunk_name == NULL || strstr (thunk_name, " thunk to ") == NULL) |
1206 | return 0; | |
1207 | ||
1208 | fn_name = strstr (thunk_name, " thunk to ") + strlen (" thunk to "); | |
1209 | fn_sym = lookup_minimal_symbol (fn_name, NULL, section->objfile); | |
3b7344d5 | 1210 | if (fn_sym.minsym == NULL) |
b18be20d DJ |
1211 | return 0; |
1212 | ||
77e371c0 | 1213 | method_stop_pc = BMSYMBOL_VALUE_ADDRESS (fn_sym); |
a513d1e8 LM |
1214 | |
1215 | /* Some targets have minimal symbols pointing to function descriptors | |
1216 | (powerpc 64 for example). Make sure to retrieve the address | |
1217 | of the real function from the function descriptor before passing on | |
1218 | the address to other layers of GDB. */ | |
1219 | func_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, method_stop_pc, | |
8b88a78e | 1220 | current_top_target ()); |
a513d1e8 LM |
1221 | if (func_addr != 0) |
1222 | method_stop_pc = func_addr; | |
1223 | ||
e76f05fa | 1224 | real_stop_pc = gdbarch_skip_trampoline_code |
9970f04b | 1225 | (gdbarch, frame, method_stop_pc); |
b18be20d DJ |
1226 | if (real_stop_pc == 0) |
1227 | real_stop_pc = method_stop_pc; | |
1228 | ||
1229 | return real_stop_pc; | |
1230 | } | |
1231 | ||
41f1b697 DJ |
1232 | /* Return nonzero if a type should be passed by reference. |
1233 | ||
1234 | The rule in the v3 ABI document comes from section 3.1.1. If the | |
1235 | type has a non-trivial copy constructor or destructor, then the | |
1236 | caller must make a copy (by calling the copy constructor if there | |
1237 | is one or perform the copy itself otherwise), pass the address of | |
1238 | the copy, and then destroy the temporary (if necessary). | |
1239 | ||
1240 | For return values with non-trivial copy constructors or | |
1241 | destructors, space will be allocated in the caller, and a pointer | |
1242 | will be passed as the first argument (preceding "this"). | |
1243 | ||
1244 | We don't have a bulletproof mechanism for determining whether a | |
1245 | constructor or destructor is trivial. For GCC and DWARF2 debug | |
1246 | information, we can check the artificial flag. | |
1247 | ||
1248 | We don't do anything with the constructors or destructors, | |
1249 | but we have to get the argument passing right anyway. */ | |
1250 | static int | |
1251 | gnuv3_pass_by_reference (struct type *type) | |
1252 | { | |
1253 | int fieldnum, fieldelem; | |
1254 | ||
f168693b | 1255 | type = check_typedef (type); |
41f1b697 DJ |
1256 | |
1257 | /* We're only interested in things that can have methods. */ | |
1258 | if (TYPE_CODE (type) != TYPE_CODE_STRUCT | |
41f1b697 DJ |
1259 | && TYPE_CODE (type) != TYPE_CODE_UNION) |
1260 | return 0; | |
1261 | ||
ebb8ece2 SC |
1262 | /* A dynamic class has a non-trivial copy constructor. |
1263 | See c++98 section 12.8 Copying class objects [class.copy]. */ | |
1264 | if (gnuv3_dynamic_class (type)) | |
1265 | return 1; | |
1266 | ||
41f1b697 DJ |
1267 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) |
1268 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
1269 | fieldelem++) | |
1270 | { | |
1271 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
0d5cff50 | 1272 | const char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum); |
41f1b697 DJ |
1273 | struct type *fieldtype = TYPE_FN_FIELD_TYPE (fn, fieldelem); |
1274 | ||
1275 | /* If this function is marked as artificial, it is compiler-generated, | |
1276 | and we assume it is trivial. */ | |
1277 | if (TYPE_FN_FIELD_ARTIFICIAL (fn, fieldelem)) | |
1278 | continue; | |
1279 | ||
1280 | /* If we've found a destructor, we must pass this by reference. */ | |
1281 | if (name[0] == '~') | |
1282 | return 1; | |
1283 | ||
1284 | /* If the mangled name of this method doesn't indicate that it | |
1285 | is a constructor, we're not interested. | |
1286 | ||
1287 | FIXME drow/2007-09-23: We could do this using the name of | |
1288 | the method and the name of the class instead of dealing | |
1289 | with the mangled name. We don't have a convenient function | |
1290 | to strip off both leading scope qualifiers and trailing | |
1291 | template arguments yet. */ | |
7d27a96d TT |
1292 | if (!is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem)) |
1293 | && !TYPE_FN_FIELD_CONSTRUCTOR (fn, fieldelem)) | |
41f1b697 DJ |
1294 | continue; |
1295 | ||
1296 | /* If this method takes two arguments, and the second argument is | |
1297 | a reference to this class, then it is a copy constructor. */ | |
82c48ac7 SC |
1298 | if (TYPE_NFIELDS (fieldtype) == 2) |
1299 | { | |
1300 | struct type *arg_type = TYPE_FIELD_TYPE (fieldtype, 1); | |
82c48ac7 | 1301 | |
3433cfa5 SC |
1302 | if (TYPE_CODE (arg_type) == TYPE_CODE_REF) |
1303 | { | |
1304 | struct type *arg_target_type; | |
82c48ac7 | 1305 | |
3433cfa5 SC |
1306 | arg_target_type = check_typedef (TYPE_TARGET_TYPE (arg_type)); |
1307 | if (class_types_same_p (arg_target_type, type)) | |
1308 | return 1; | |
1309 | } | |
82c48ac7 | 1310 | } |
41f1b697 DJ |
1311 | } |
1312 | ||
1313 | /* Even if all the constructors and destructors were artificial, one | |
1314 | of them may have invoked a non-artificial constructor or | |
1315 | destructor in a base class. If any base class needs to be passed | |
1316 | by reference, so does this class. Similarly for members, which | |
1317 | are constructed whenever this class is. We do not need to worry | |
1318 | about recursive loops here, since we are only looking at members | |
bceffbf3 | 1319 | of complete class type. Also ignore any static members. */ |
41f1b697 | 1320 | for (fieldnum = 0; fieldnum < TYPE_NFIELDS (type); fieldnum++) |
bceffbf3 JK |
1321 | if (! field_is_static (&TYPE_FIELD (type, fieldnum)) |
1322 | && gnuv3_pass_by_reference (TYPE_FIELD_TYPE (type, fieldnum))) | |
41f1b697 DJ |
1323 | return 1; |
1324 | ||
1325 | return 0; | |
1326 | } | |
1327 | ||
7ed49443 JB |
1328 | static void |
1329 | init_gnuv3_ops (void) | |
1330 | { | |
0963b4bd MS |
1331 | vtable_type_gdbarch_data |
1332 | = gdbarch_data_register_post_init (build_gdb_vtable_type); | |
6e72ca20 TT |
1333 | std_type_info_gdbarch_data |
1334 | = gdbarch_data_register_post_init (build_std_type_info_type); | |
7ed49443 JB |
1335 | |
1336 | gnu_v3_abi_ops.shortname = "gnu-v3"; | |
1337 | gnu_v3_abi_ops.longname = "GNU G++ Version 3 ABI"; | |
1338 | gnu_v3_abi_ops.doc = "G++ Version 3 ABI"; | |
358777b0 EZ |
1339 | gnu_v3_abi_ops.is_destructor_name = |
1340 | (enum dtor_kinds (*) (const char *))is_gnu_v3_mangled_dtor; | |
1341 | gnu_v3_abi_ops.is_constructor_name = | |
1342 | (enum ctor_kinds (*) (const char *))is_gnu_v3_mangled_ctor; | |
7ed49443 JB |
1343 | gnu_v3_abi_ops.is_vtable_name = gnuv3_is_vtable_name; |
1344 | gnu_v3_abi_ops.is_operator_name = gnuv3_is_operator_name; | |
1345 | gnu_v3_abi_ops.rtti_type = gnuv3_rtti_type; | |
1346 | gnu_v3_abi_ops.virtual_fn_field = gnuv3_virtual_fn_field; | |
1514d34e | 1347 | gnu_v3_abi_ops.baseclass_offset = gnuv3_baseclass_offset; |
0d5de010 DJ |
1348 | gnu_v3_abi_ops.print_method_ptr = gnuv3_print_method_ptr; |
1349 | gnu_v3_abi_ops.method_ptr_size = gnuv3_method_ptr_size; | |
1350 | gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr; | |
1351 | gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value; | |
c4aeac85 | 1352 | gnu_v3_abi_ops.print_vtable = gnuv3_print_vtable; |
6e72ca20 TT |
1353 | gnu_v3_abi_ops.get_typeid = gnuv3_get_typeid; |
1354 | gnu_v3_abi_ops.get_typeid_type = gnuv3_get_typeid_type; | |
72f1fe8a | 1355 | gnu_v3_abi_ops.get_type_from_type_info = gnuv3_get_type_from_type_info; |
cc16e6c9 TT |
1356 | gnu_v3_abi_ops.get_typename_from_type_info |
1357 | = gnuv3_get_typename_from_type_info; | |
b18be20d | 1358 | gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline; |
41f1b697 | 1359 | gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference; |
7ed49443 JB |
1360 | } |
1361 | ||
7ed49443 JB |
1362 | void |
1363 | _initialize_gnu_v3_abi (void) | |
1364 | { | |
1365 | init_gnuv3_ops (); | |
1366 | ||
fe1f4a5e | 1367 | register_cp_abi (&gnu_v3_abi_ops); |
1605ef26 | 1368 | set_cp_abi_as_auto_default (gnu_v3_abi_ops.shortname); |
7ed49443 | 1369 | } |