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7ed49443 JB |
1 | /* Abstraction of GNU v3 abi. |
2 | Contributed by Jim Blandy <jimb@redhat.com> | |
451fbdda | 3 | |
b811d2c2 | 4 | Copyright (C) 2001-2020 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" |
62bf63d7 | 26 | #include "dwarf2.h" |
b18be20d | 27 | #include "objfiles.h" |
0d5de010 | 28 | #include "valprint.h" |
94af9270 | 29 | #include "c-lang.h" |
79d43c61 | 30 | #include "typeprint.h" |
59d3651b | 31 | #include <algorithm> |
7f6aba03 | 32 | #include "cli/cli-style.h" |
7d79de9a | 33 | #include "dwarf2/loc.h" |
0d5de010 | 34 | |
b27b8843 | 35 | static struct cp_abi_ops gnu_v3_abi_ops; |
7ed49443 | 36 | |
6e72ca20 TT |
37 | /* A gdbarch key for std::type_info, in the event that it can't be |
38 | found in the debug info. */ | |
39 | ||
40 | static struct gdbarch_data *std_type_info_gdbarch_data; | |
41 | ||
42 | ||
7ed49443 JB |
43 | static int |
44 | gnuv3_is_vtable_name (const char *name) | |
45 | { | |
61012eef | 46 | return startswith (name, "_ZTV"); |
7ed49443 JB |
47 | } |
48 | ||
49 | static int | |
50 | gnuv3_is_operator_name (const char *name) | |
51 | { | |
8090b426 | 52 | return startswith (name, CP_OPERATOR_STR); |
7ed49443 JB |
53 | } |
54 | ||
55 | ||
56 | /* To help us find the components of a vtable, we build ourselves a | |
57 | GDB type object representing the vtable structure. Following the | |
58 | V3 ABI, it goes something like this: | |
59 | ||
60 | struct gdb_gnu_v3_abi_vtable { | |
61 | ||
62 | / * An array of virtual call and virtual base offsets. The real | |
dda83cd7 SM |
63 | length of this array depends on the class hierarchy; we use |
64 | negative subscripts to access the elements. Yucky, but | |
65 | better than the alternatives. * / | |
7ed49443 JB |
66 | ptrdiff_t vcall_and_vbase_offsets[0]; |
67 | ||
68 | / * The offset from a virtual pointer referring to this table | |
dda83cd7 | 69 | to the top of the complete object. * / |
7ed49443 JB |
70 | ptrdiff_t offset_to_top; |
71 | ||
72 | / * The type_info pointer for this class. This is really a | |
dda83cd7 SM |
73 | std::type_info *, but GDB doesn't really look at the |
74 | type_info object itself, so we don't bother to get the type | |
75 | exactly right. * / | |
7ed49443 JB |
76 | void *type_info; |
77 | ||
78 | / * Virtual table pointers in objects point here. * / | |
79 | ||
80 | / * Virtual function pointers. Like the vcall/vbase array, the | |
dda83cd7 | 81 | real length of this table depends on the class hierarchy. * / |
7ed49443 JB |
82 | void (*virtual_functions[0]) (); |
83 | ||
84 | }; | |
85 | ||
86 | The catch, of course, is that the exact layout of this table | |
87 | depends on the ABI --- word size, endianness, alignment, etc. So | |
88 | the GDB type object is actually a per-architecture kind of thing. | |
89 | ||
90 | vtable_type_gdbarch_data is a gdbarch per-architecture data pointer | |
91 | which refers to the struct type * for this structure, laid out | |
92 | appropriately for the architecture. */ | |
b27b8843 | 93 | static struct gdbarch_data *vtable_type_gdbarch_data; |
7ed49443 JB |
94 | |
95 | ||
96 | /* Human-readable names for the numbers of the fields above. */ | |
97 | enum { | |
98 | vtable_field_vcall_and_vbase_offsets, | |
99 | vtable_field_offset_to_top, | |
100 | vtable_field_type_info, | |
101 | vtable_field_virtual_functions | |
102 | }; | |
103 | ||
104 | ||
105 | /* Return a GDB type representing `struct gdb_gnu_v3_abi_vtable', | |
106 | described above, laid out appropriately for ARCH. | |
107 | ||
108 | We use this function as the gdbarch per-architecture data | |
9970f04b | 109 | initialization function. */ |
7ed49443 JB |
110 | static void * |
111 | build_gdb_vtable_type (struct gdbarch *arch) | |
112 | { | |
113 | struct type *t; | |
114 | struct field *field_list, *field; | |
115 | int offset; | |
116 | ||
117 | struct type *void_ptr_type | |
fde6c819 | 118 | = builtin_type (arch)->builtin_data_ptr; |
7ed49443 | 119 | struct type *ptr_to_void_fn_type |
fde6c819 | 120 | = builtin_type (arch)->builtin_func_ptr; |
7ed49443 JB |
121 | |
122 | /* ARCH can't give us the true ptrdiff_t type, so we guess. */ | |
123 | struct type *ptrdiff_type | |
e9bb382b | 124 | = arch_integer_type (arch, gdbarch_ptr_bit (arch), 0, "ptrdiff_t"); |
7ed49443 JB |
125 | |
126 | /* We assume no padding is necessary, since GDB doesn't know | |
127 | anything about alignment at the moment. If this assumption bites | |
128 | us, we should add a gdbarch method which, given a type, returns | |
129 | the alignment that type requires, and then use that here. */ | |
130 | ||
131 | /* Build the field list. */ | |
8d749320 | 132 | field_list = XCNEWVEC (struct field, 4); |
7ed49443 JB |
133 | field = &field_list[0]; |
134 | offset = 0; | |
135 | ||
136 | /* ptrdiff_t vcall_and_vbase_offsets[0]; */ | |
137 | FIELD_NAME (*field) = "vcall_and_vbase_offsets"; | |
5d14b6e5 | 138 | field->set_type (lookup_array_range_type (ptrdiff_type, 0, -1)); |
f41f5e61 | 139 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 140 | offset += TYPE_LENGTH (field->type ()); |
7ed49443 JB |
141 | field++; |
142 | ||
143 | /* ptrdiff_t offset_to_top; */ | |
144 | FIELD_NAME (*field) = "offset_to_top"; | |
5d14b6e5 | 145 | field->set_type (ptrdiff_type); |
f41f5e61 | 146 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 147 | offset += TYPE_LENGTH (field->type ()); |
7ed49443 JB |
148 | field++; |
149 | ||
150 | /* void *type_info; */ | |
151 | FIELD_NAME (*field) = "type_info"; | |
5d14b6e5 | 152 | field->set_type (void_ptr_type); |
f41f5e61 | 153 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 154 | offset += TYPE_LENGTH (field->type ()); |
7ed49443 JB |
155 | field++; |
156 | ||
157 | /* void (*virtual_functions[0]) (); */ | |
158 | FIELD_NAME (*field) = "virtual_functions"; | |
5d14b6e5 | 159 | field->set_type (lookup_array_range_type (ptr_to_void_fn_type, 0, -1)); |
f41f5e61 | 160 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 161 | offset += TYPE_LENGTH (field->type ()); |
7ed49443 JB |
162 | field++; |
163 | ||
164 | /* We assumed in the allocation above that there were four fields. */ | |
3d499020 | 165 | gdb_assert (field == (field_list + 4)); |
7ed49443 | 166 | |
77b7c781 | 167 | t = arch_type (arch, TYPE_CODE_STRUCT, offset * TARGET_CHAR_BIT, NULL); |
5e33d5f4 | 168 | t->set_num_fields (field - field_list); |
3cabb6b0 | 169 | t->set_fields (field_list); |
d0e39ea2 | 170 | t->set_name ("gdb_gnu_v3_abi_vtable"); |
e9bb382b | 171 | INIT_CPLUS_SPECIFIC (t); |
7ed49443 | 172 | |
706d0883 | 173 | return make_type_with_address_space (t, TYPE_INSTANCE_FLAG_CODE_SPACE); |
7ed49443 JB |
174 | } |
175 | ||
176 | ||
ed09d7da KB |
177 | /* Return the ptrdiff_t type used in the vtable type. */ |
178 | static struct type * | |
179 | vtable_ptrdiff_type (struct gdbarch *gdbarch) | |
180 | { | |
9a3c8263 SM |
181 | struct type *vtable_type |
182 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
ed09d7da KB |
183 | |
184 | /* The "offset_to_top" field has the appropriate (ptrdiff_t) type. */ | |
940da03e | 185 | return vtable_type->field (vtable_field_offset_to_top).type (); |
ed09d7da KB |
186 | } |
187 | ||
7ed49443 JB |
188 | /* Return the offset from the start of the imaginary `struct |
189 | gdb_gnu_v3_abi_vtable' object to the vtable's "address point" | |
190 | (i.e., where objects' virtual table pointers point). */ | |
191 | static int | |
ad4820ab | 192 | vtable_address_point_offset (struct gdbarch *gdbarch) |
7ed49443 | 193 | { |
9a3c8263 SM |
194 | struct type *vtable_type |
195 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
7ed49443 JB |
196 | |
197 | return (TYPE_FIELD_BITPOS (vtable_type, vtable_field_virtual_functions) | |
dda83cd7 | 198 | / TARGET_CHAR_BIT); |
7ed49443 JB |
199 | } |
200 | ||
201 | ||
d48cc9dd DJ |
202 | /* Determine whether structure TYPE is a dynamic class. Cache the |
203 | result. */ | |
204 | ||
205 | static int | |
206 | gnuv3_dynamic_class (struct type *type) | |
207 | { | |
208 | int fieldnum, fieldelem; | |
209 | ||
f168693b | 210 | type = check_typedef (type); |
78134374 SM |
211 | gdb_assert (type->code () == TYPE_CODE_STRUCT |
212 | || type->code () == TYPE_CODE_UNION); | |
5f4ce105 | 213 | |
78134374 | 214 | if (type->code () == TYPE_CODE_UNION) |
5f4ce105 DE |
215 | return 0; |
216 | ||
d48cc9dd DJ |
217 | if (TYPE_CPLUS_DYNAMIC (type)) |
218 | return TYPE_CPLUS_DYNAMIC (type) == 1; | |
219 | ||
220 | ALLOCATE_CPLUS_STRUCT_TYPE (type); | |
221 | ||
222 | for (fieldnum = 0; fieldnum < TYPE_N_BASECLASSES (type); fieldnum++) | |
223 | if (BASETYPE_VIA_VIRTUAL (type, fieldnum) | |
940da03e | 224 | || gnuv3_dynamic_class (type->field (fieldnum).type ())) |
d48cc9dd DJ |
225 | { |
226 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
227 | return 1; | |
228 | } | |
229 | ||
230 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) | |
231 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
232 | fieldelem++) | |
233 | { | |
234 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
235 | ||
236 | if (TYPE_FN_FIELD_VIRTUAL_P (f, fieldelem)) | |
237 | { | |
238 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
239 | return 1; | |
240 | } | |
241 | } | |
242 | ||
243 | TYPE_CPLUS_DYNAMIC (type) = -1; | |
244 | return 0; | |
245 | } | |
246 | ||
247 | /* Find the vtable for a value of CONTAINER_TYPE located at | |
248 | CONTAINER_ADDR. Return a value of the correct vtable type for this | |
249 | architecture, or NULL if CONTAINER does not have a vtable. */ | |
250 | ||
251 | static struct value * | |
252 | gnuv3_get_vtable (struct gdbarch *gdbarch, | |
253 | struct type *container_type, CORE_ADDR container_addr) | |
254 | { | |
9a3c8263 SM |
255 | struct type *vtable_type |
256 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
d48cc9dd DJ |
257 | struct type *vtable_pointer_type; |
258 | struct value *vtable_pointer; | |
259 | CORE_ADDR vtable_address; | |
260 | ||
f168693b | 261 | container_type = check_typedef (container_type); |
78134374 | 262 | gdb_assert (container_type->code () == TYPE_CODE_STRUCT); |
5f4ce105 | 263 | |
d48cc9dd DJ |
264 | /* If this type does not have a virtual table, don't read the first |
265 | field. */ | |
5f4ce105 | 266 | if (!gnuv3_dynamic_class (container_type)) |
d48cc9dd DJ |
267 | return NULL; |
268 | ||
269 | /* We do not consult the debug information to find the virtual table. | |
270 | The ABI specifies that it is always at offset zero in any class, | |
271 | and debug information may not represent it. | |
272 | ||
273 | We avoid using value_contents on principle, because the object might | |
274 | be large. */ | |
275 | ||
276 | /* Find the type "pointer to virtual table". */ | |
277 | vtable_pointer_type = lookup_pointer_type (vtable_type); | |
278 | ||
279 | /* Load it from the start of the class. */ | |
280 | vtable_pointer = value_at (vtable_pointer_type, container_addr); | |
281 | vtable_address = value_as_address (vtable_pointer); | |
282 | ||
283 | /* Correct it to point at the start of the virtual table, rather | |
284 | than the address point. */ | |
285 | return value_at_lazy (vtable_type, | |
0963b4bd MS |
286 | vtable_address |
287 | - vtable_address_point_offset (gdbarch)); | |
d48cc9dd DJ |
288 | } |
289 | ||
290 | ||
7ed49443 JB |
291 | static struct type * |
292 | gnuv3_rtti_type (struct value *value, | |
dda83cd7 | 293 | int *full_p, LONGEST *top_p, int *using_enc_p) |
7ed49443 | 294 | { |
ad4820ab | 295 | struct gdbarch *gdbarch; |
df407dfe | 296 | struct type *values_type = check_typedef (value_type (value)); |
7ed49443 JB |
297 | struct value *vtable; |
298 | struct minimal_symbol *vtable_symbol; | |
299 | const char *vtable_symbol_name; | |
300 | const char *class_name; | |
7ed49443 JB |
301 | struct type *run_time_type; |
302 | LONGEST offset_to_top; | |
e6a959d6 | 303 | const char *atsign; |
7ed49443 | 304 | |
e95a97d4 | 305 | /* We only have RTTI for dynamic class objects. */ |
78134374 | 306 | if (values_type->code () != TYPE_CODE_STRUCT |
e95a97d4 | 307 | || !gnuv3_dynamic_class (values_type)) |
7ed49443 JB |
308 | return NULL; |
309 | ||
ad4820ab | 310 | /* Determine architecture. */ |
50810684 | 311 | gdbarch = get_type_arch (values_type); |
7ed49443 | 312 | |
21cfb3b6 DJ |
313 | if (using_enc_p) |
314 | *using_enc_p = 0; | |
315 | ||
5f4ce105 | 316 | vtable = gnuv3_get_vtable (gdbarch, values_type, |
d48cc9dd DJ |
317 | value_as_address (value_addr (value))); |
318 | if (vtable == NULL) | |
319 | return NULL; | |
320 | ||
7ed49443 JB |
321 | /* Find the linker symbol for this vtable. */ |
322 | vtable_symbol | |
42ae5230 | 323 | = lookup_minimal_symbol_by_pc (value_address (vtable) |
dda83cd7 | 324 | + value_embedded_offset (vtable)).minsym; |
7ed49443 JB |
325 | if (! vtable_symbol) |
326 | return NULL; | |
327 | ||
328 | /* The symbol's demangled name should be something like "vtable for | |
329 | CLASS", where CLASS is the name of the run-time type of VALUE. | |
330 | If we didn't like this approach, we could instead look in the | |
331 | type_info object itself to get the class name. But this way | |
332 | should work just as well, and doesn't read target memory. */ | |
c9d95fa3 | 333 | vtable_symbol_name = vtable_symbol->demangled_name (); |
98081e55 | 334 | if (vtable_symbol_name == NULL |
61012eef | 335 | || !startswith (vtable_symbol_name, "vtable for ")) |
f773fdbb | 336 | { |
8a3fe4f8 | 337 | warning (_("can't find linker symbol for virtual table for `%s' value"), |
0a07729b | 338 | TYPE_SAFE_NAME (values_type)); |
f773fdbb | 339 | if (vtable_symbol_name) |
8a3fe4f8 | 340 | warning (_(" found `%s' instead"), vtable_symbol_name); |
f773fdbb JM |
341 | return NULL; |
342 | } | |
7ed49443 JB |
343 | class_name = vtable_symbol_name + 11; |
344 | ||
8de20a37 TT |
345 | /* Strip off @plt and version suffixes. */ |
346 | atsign = strchr (class_name, '@'); | |
347 | if (atsign != NULL) | |
348 | { | |
349 | char *copy; | |
350 | ||
224c3ddb | 351 | copy = (char *) alloca (atsign - class_name + 1); |
8de20a37 TT |
352 | memcpy (copy, class_name, atsign - class_name); |
353 | copy[atsign - class_name] = '\0'; | |
354 | class_name = copy; | |
355 | } | |
356 | ||
7ed49443 | 357 | /* Try to look up the class name as a type name. */ |
0963b4bd | 358 | /* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */ |
362ff856 MC |
359 | run_time_type = cp_lookup_rtti_type (class_name, NULL); |
360 | if (run_time_type == NULL) | |
361 | return NULL; | |
7ed49443 JB |
362 | |
363 | /* Get the offset from VALUE to the top of the complete object. | |
364 | NOTE: this is the reverse of the meaning of *TOP_P. */ | |
365 | offset_to_top | |
366 | = value_as_long (value_field (vtable, vtable_field_offset_to_top)); | |
367 | ||
368 | if (full_p) | |
13c3b5f5 | 369 | *full_p = (- offset_to_top == value_embedded_offset (value) |
dda83cd7 SM |
370 | && (TYPE_LENGTH (value_enclosing_type (value)) |
371 | >= TYPE_LENGTH (run_time_type))); | |
7ed49443 JB |
372 | if (top_p) |
373 | *top_p = - offset_to_top; | |
7ed49443 JB |
374 | return run_time_type; |
375 | } | |
376 | ||
0d5de010 DJ |
377 | /* Return a function pointer for CONTAINER's VTABLE_INDEX'th virtual |
378 | function, of type FNTYPE. */ | |
7ed49443 | 379 | |
0d5de010 | 380 | static struct value * |
ad4820ab UW |
381 | gnuv3_get_virtual_fn (struct gdbarch *gdbarch, struct value *container, |
382 | struct type *fntype, int vtable_index) | |
0d5de010 | 383 | { |
d48cc9dd DJ |
384 | struct value *vtable, *vfn; |
385 | ||
386 | /* Every class with virtual functions must have a vtable. */ | |
387 | vtable = gnuv3_get_vtable (gdbarch, value_type (container), | |
388 | value_as_address (value_addr (container))); | |
389 | gdb_assert (vtable != NULL); | |
7ed49443 JB |
390 | |
391 | /* Fetch the appropriate function pointer from the vtable. */ | |
392 | vfn = value_subscript (value_field (vtable, vtable_field_virtual_functions), | |
dda83cd7 | 393 | vtable_index); |
7ed49443 | 394 | |
0d5de010 DJ |
395 | /* If this architecture uses function descriptors directly in the vtable, |
396 | then the address of the vtable entry is actually a "function pointer" | |
397 | (i.e. points to the descriptor). We don't need to scale the index | |
85102364 | 398 | by the size of a function descriptor; GCC does that before outputting |
0d5de010 | 399 | debug information. */ |
ad4820ab | 400 | if (gdbarch_vtable_function_descriptors (gdbarch)) |
0d5de010 | 401 | vfn = value_addr (vfn); |
7ed49443 | 402 | |
0d5de010 DJ |
403 | /* Cast the function pointer to the appropriate type. */ |
404 | vfn = value_cast (lookup_pointer_type (fntype), vfn); | |
76b79d6e | 405 | |
7ed49443 JB |
406 | return vfn; |
407 | } | |
408 | ||
0d5de010 DJ |
409 | /* GNU v3 implementation of value_virtual_fn_field. See cp-abi.h |
410 | for a description of the arguments. */ | |
411 | ||
412 | static struct value * | |
413 | gnuv3_virtual_fn_field (struct value **value_p, | |
dda83cd7 | 414 | struct fn_field *f, int j, |
0d5de010 DJ |
415 | struct type *vfn_base, int offset) |
416 | { | |
417 | struct type *values_type = check_typedef (value_type (*value_p)); | |
ad4820ab | 418 | struct gdbarch *gdbarch; |
0d5de010 DJ |
419 | |
420 | /* Some simple sanity checks. */ | |
78134374 | 421 | if (values_type->code () != TYPE_CODE_STRUCT) |
0d5de010 DJ |
422 | error (_("Only classes can have virtual functions.")); |
423 | ||
ad4820ab | 424 | /* Determine architecture. */ |
50810684 | 425 | gdbarch = get_type_arch (values_type); |
ad4820ab | 426 | |
0d5de010 DJ |
427 | /* Cast our value to the base class which defines this virtual |
428 | function. This takes care of any necessary `this' | |
429 | adjustments. */ | |
430 | if (vfn_base != values_type) | |
431 | *value_p = value_cast (vfn_base, *value_p); | |
432 | ||
ad4820ab | 433 | return gnuv3_get_virtual_fn (gdbarch, *value_p, TYPE_FN_FIELD_TYPE (f, j), |
0d5de010 DJ |
434 | TYPE_FN_FIELD_VOFFSET (f, j)); |
435 | } | |
436 | ||
1514d34e DJ |
437 | /* Compute the offset of the baseclass which is |
438 | the INDEXth baseclass of class TYPE, | |
439 | for value at VALADDR (in host) at ADDRESS (in target). | |
440 | The result is the offset of the baseclass value relative | |
441 | to (the address of)(ARG) + OFFSET. | |
442 | ||
0963b4bd MS |
443 | -1 is returned on error. */ |
444 | ||
b9362cc7 | 445 | static int |
8af8e3bc | 446 | gnuv3_baseclass_offset (struct type *type, int index, |
6b850546 | 447 | const bfd_byte *valaddr, LONGEST embedded_offset, |
8af8e3bc | 448 | CORE_ADDR address, const struct value *val) |
1514d34e | 449 | { |
ad4820ab | 450 | struct gdbarch *gdbarch; |
ad4820ab | 451 | struct type *ptr_type; |
79d5b63a | 452 | struct value *vtable; |
2497b498 | 453 | struct value *vbase_array; |
1514d34e | 454 | long int cur_base_offset, base_offset; |
1514d34e | 455 | |
ad4820ab | 456 | /* Determine architecture. */ |
50810684 | 457 | gdbarch = get_type_arch (type); |
ad4820ab UW |
458 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
459 | ||
1514d34e | 460 | /* If it isn't a virtual base, this is easy. The offset is in the |
9c37b5ae TT |
461 | type definition. */ |
462 | if (!BASETYPE_VIA_VIRTUAL (type, index)) | |
1514d34e DJ |
463 | return TYPE_BASECLASS_BITPOS (type, index) / 8; |
464 | ||
7d79de9a TT |
465 | /* If we have a DWARF expression for the offset, evaluate it. */ |
466 | if (TYPE_FIELD_LOC_KIND (type, index) == FIELD_LOC_KIND_DWARF_BLOCK) | |
467 | { | |
468 | struct dwarf2_property_baton baton; | |
469 | baton.property_type | |
940da03e | 470 | = lookup_pointer_type (type->field (index).type ()); |
7d79de9a TT |
471 | baton.locexpr = *TYPE_FIELD_DWARF_BLOCK (type, index); |
472 | ||
473 | struct dynamic_prop prop; | |
8c2e4e06 | 474 | prop.set_locexpr (&baton); |
7d79de9a TT |
475 | |
476 | struct property_addr_info addr_stack; | |
477 | addr_stack.type = type; | |
478 | /* Note that we don't set "valaddr" here. Doing so causes | |
479 | regressions. FIXME. */ | |
480 | addr_stack.addr = address + embedded_offset; | |
481 | addr_stack.next = nullptr; | |
482 | ||
483 | CORE_ADDR result; | |
484 | if (dwarf2_evaluate_property (&prop, nullptr, &addr_stack, &result, | |
485 | true)) | |
486 | return (int) (result - addr_stack.addr); | |
487 | } | |
488 | ||
1514d34e DJ |
489 | /* To access a virtual base, we need to use the vbase offset stored in |
490 | our vtable. Recent GCC versions provide this information. If it isn't | |
491 | available, we could get what we needed from RTTI, or from drawing the | |
492 | complete inheritance graph based on the debug info. Neither is | |
493 | worthwhile. */ | |
494 | cur_base_offset = TYPE_BASECLASS_BITPOS (type, index) / 8; | |
ad4820ab | 495 | if (cur_base_offset >= - vtable_address_point_offset (gdbarch)) |
8a3fe4f8 | 496 | error (_("Expected a negative vbase offset (old compiler?)")); |
1514d34e | 497 | |
ad4820ab UW |
498 | cur_base_offset = cur_base_offset + vtable_address_point_offset (gdbarch); |
499 | if ((- cur_base_offset) % TYPE_LENGTH (ptr_type) != 0) | |
8a3fe4f8 | 500 | error (_("Misaligned vbase offset.")); |
ad4820ab | 501 | cur_base_offset = cur_base_offset / ((int) TYPE_LENGTH (ptr_type)); |
1514d34e | 502 | |
8af8e3bc | 503 | vtable = gnuv3_get_vtable (gdbarch, type, address + embedded_offset); |
d48cc9dd | 504 | gdb_assert (vtable != NULL); |
1514d34e | 505 | vbase_array = value_field (vtable, vtable_field_vcall_and_vbase_offsets); |
2497b498 | 506 | base_offset = value_as_long (value_subscript (vbase_array, cur_base_offset)); |
1514d34e DJ |
507 | return base_offset; |
508 | } | |
7ed49443 | 509 | |
0d5de010 DJ |
510 | /* Locate a virtual method in DOMAIN or its non-virtual base classes |
511 | which has virtual table index VOFFSET. The method has an associated | |
512 | "this" adjustment of ADJUSTMENT bytes. */ | |
513 | ||
2c0b251b | 514 | static const char * |
0d5de010 DJ |
515 | gnuv3_find_method_in (struct type *domain, CORE_ADDR voffset, |
516 | LONGEST adjustment) | |
517 | { | |
518 | int i; | |
0d5de010 DJ |
519 | |
520 | /* Search this class first. */ | |
0d5de010 DJ |
521 | if (adjustment == 0) |
522 | { | |
523 | int len; | |
524 | ||
525 | len = TYPE_NFN_FIELDS (domain); | |
526 | for (i = 0; i < len; i++) | |
527 | { | |
528 | int len2, j; | |
529 | struct fn_field *f; | |
530 | ||
531 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
532 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
533 | ||
534 | check_stub_method_group (domain, i); | |
535 | for (j = 0; j < len2; j++) | |
536 | if (TYPE_FN_FIELD_VOFFSET (f, j) == voffset) | |
537 | return TYPE_FN_FIELD_PHYSNAME (f, j); | |
538 | } | |
539 | } | |
540 | ||
541 | /* Next search non-virtual bases. If it's in a virtual base, | |
542 | we're out of luck. */ | |
543 | for (i = 0; i < TYPE_N_BASECLASSES (domain); i++) | |
544 | { | |
545 | int pos; | |
546 | struct type *basetype; | |
547 | ||
548 | if (BASETYPE_VIA_VIRTUAL (domain, i)) | |
549 | continue; | |
550 | ||
551 | pos = TYPE_BASECLASS_BITPOS (domain, i) / 8; | |
940da03e | 552 | basetype = domain->field (i).type (); |
0d5de010 DJ |
553 | /* Recurse with a modified adjustment. We don't need to adjust |
554 | voffset. */ | |
555 | if (adjustment >= pos && adjustment < pos + TYPE_LENGTH (basetype)) | |
556 | return gnuv3_find_method_in (basetype, voffset, adjustment - pos); | |
557 | } | |
558 | ||
559 | return NULL; | |
560 | } | |
561 | ||
fead6908 UW |
562 | /* Decode GNU v3 method pointer. */ |
563 | ||
564 | static int | |
ad4820ab UW |
565 | gnuv3_decode_method_ptr (struct gdbarch *gdbarch, |
566 | const gdb_byte *contents, | |
fead6908 UW |
567 | CORE_ADDR *value_p, |
568 | LONGEST *adjustment_p) | |
569 | { | |
ad4820ab | 570 | struct type *funcptr_type = builtin_type (gdbarch)->builtin_func_ptr; |
ed09d7da | 571 | struct type *offset_type = vtable_ptrdiff_type (gdbarch); |
e17a4113 | 572 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
fead6908 UW |
573 | CORE_ADDR ptr_value; |
574 | LONGEST voffset, adjustment; | |
575 | int vbit; | |
576 | ||
577 | /* Extract the pointer to member. The first element is either a pointer | |
578 | or a vtable offset. For pointers, we need to use extract_typed_address | |
579 | to allow the back-end to convert the pointer to a GDB address -- but | |
580 | vtable offsets we must handle as integers. At this point, we do not | |
581 | yet know which case we have, so we extract the value under both | |
582 | interpretations and choose the right one later on. */ | |
583 | ptr_value = extract_typed_address (contents, funcptr_type); | |
e17a4113 UW |
584 | voffset = extract_signed_integer (contents, |
585 | TYPE_LENGTH (funcptr_type), byte_order); | |
fead6908 | 586 | contents += TYPE_LENGTH (funcptr_type); |
e17a4113 UW |
587 | adjustment = extract_signed_integer (contents, |
588 | TYPE_LENGTH (offset_type), byte_order); | |
fead6908 | 589 | |
ad4820ab | 590 | if (!gdbarch_vbit_in_delta (gdbarch)) |
fead6908 UW |
591 | { |
592 | vbit = voffset & 1; | |
593 | voffset = voffset ^ vbit; | |
594 | } | |
595 | else | |
596 | { | |
597 | vbit = adjustment & 1; | |
598 | adjustment = adjustment >> 1; | |
599 | } | |
600 | ||
601 | *value_p = vbit? voffset : ptr_value; | |
602 | *adjustment_p = adjustment; | |
603 | return vbit; | |
604 | } | |
605 | ||
0d5de010 DJ |
606 | /* GNU v3 implementation of cplus_print_method_ptr. */ |
607 | ||
608 | static void | |
609 | gnuv3_print_method_ptr (const gdb_byte *contents, | |
610 | struct type *type, | |
611 | struct ui_file *stream) | |
612 | { | |
09e2d7c7 DE |
613 | struct type *self_type = TYPE_SELF_TYPE (type); |
614 | struct gdbarch *gdbarch = get_type_arch (self_type); | |
0d5de010 DJ |
615 | CORE_ADDR ptr_value; |
616 | LONGEST adjustment; | |
0d5de010 DJ |
617 | int vbit; |
618 | ||
0d5de010 | 619 | /* Extract the pointer to member. */ |
ad4820ab | 620 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
621 | |
622 | /* Check for NULL. */ | |
623 | if (ptr_value == 0 && vbit == 0) | |
624 | { | |
625 | fprintf_filtered (stream, "NULL"); | |
626 | return; | |
627 | } | |
628 | ||
629 | /* Search for a virtual method. */ | |
630 | if (vbit) | |
631 | { | |
632 | CORE_ADDR voffset; | |
633 | const char *physname; | |
634 | ||
635 | /* It's a virtual table offset, maybe in this class. Search | |
636 | for a field with the correct vtable offset. First convert it | |
637 | to an index, as used in TYPE_FN_FIELD_VOFFSET. */ | |
ed09d7da | 638 | voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch)); |
0d5de010 | 639 | |
09e2d7c7 | 640 | physname = gnuv3_find_method_in (self_type, voffset, adjustment); |
0d5de010 DJ |
641 | |
642 | /* If we found a method, print that. We don't bother to disambiguate | |
643 | possible paths to the method based on the adjustment. */ | |
644 | if (physname) | |
645 | { | |
8de20a37 TT |
646 | char *demangled_name = gdb_demangle (physname, |
647 | DMGL_ANSI | DMGL_PARAMS); | |
d8734c88 | 648 | |
94af9270 KS |
649 | fprintf_filtered (stream, "&virtual "); |
650 | if (demangled_name == NULL) | |
651 | fputs_filtered (physname, stream); | |
652 | else | |
0d5de010 | 653 | { |
0d5de010 DJ |
654 | fputs_filtered (demangled_name, stream); |
655 | xfree (demangled_name); | |
0d5de010 | 656 | } |
94af9270 | 657 | return; |
0d5de010 DJ |
658 | } |
659 | } | |
94af9270 KS |
660 | else if (ptr_value != 0) |
661 | { | |
662 | /* Found a non-virtual function: print out the type. */ | |
663 | fputs_filtered ("(", stream); | |
79d43c61 | 664 | c_print_type (type, "", stream, -1, 0, &type_print_raw_options); |
94af9270 KS |
665 | fputs_filtered (") ", stream); |
666 | } | |
0d5de010 DJ |
667 | |
668 | /* We didn't find it; print the raw data. */ | |
669 | if (vbit) | |
670 | { | |
671 | fprintf_filtered (stream, "&virtual table offset "); | |
672 | print_longest (stream, 'd', 1, ptr_value); | |
673 | } | |
674 | else | |
edf0c1b7 TT |
675 | { |
676 | struct value_print_options opts; | |
677 | ||
678 | get_user_print_options (&opts); | |
679 | print_address_demangle (&opts, gdbarch, ptr_value, stream, demangle); | |
680 | } | |
0d5de010 DJ |
681 | |
682 | if (adjustment) | |
683 | { | |
684 | fprintf_filtered (stream, ", this adjustment "); | |
685 | print_longest (stream, 'd', 1, adjustment); | |
686 | } | |
687 | } | |
688 | ||
689 | /* GNU v3 implementation of cplus_method_ptr_size. */ | |
690 | ||
691 | static int | |
ad4820ab | 692 | gnuv3_method_ptr_size (struct type *type) |
0d5de010 | 693 | { |
561d3825 | 694 | struct gdbarch *gdbarch = get_type_arch (type); |
d8734c88 | 695 | |
ad4820ab | 696 | return 2 * TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr); |
0d5de010 DJ |
697 | } |
698 | ||
699 | /* GNU v3 implementation of cplus_make_method_ptr. */ | |
700 | ||
701 | static void | |
ad4820ab UW |
702 | gnuv3_make_method_ptr (struct type *type, gdb_byte *contents, |
703 | CORE_ADDR value, int is_virtual) | |
0d5de010 | 704 | { |
561d3825 | 705 | struct gdbarch *gdbarch = get_type_arch (type); |
ad4820ab | 706 | int size = TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr); |
34877895 | 707 | enum bfd_endian byte_order = type_byte_order (type); |
0d5de010 DJ |
708 | |
709 | /* FIXME drow/2006-12-24: The adjustment of "this" is currently | |
710 | always zero, since the method pointer is of the correct type. | |
711 | But if the method pointer came from a base class, this is | |
712 | incorrect - it should be the offset to the base. The best | |
713 | fix might be to create the pointer to member pointing at the | |
714 | base class and cast it to the derived class, but that requires | |
715 | support for adjusting pointers to members when casting them - | |
716 | not currently supported by GDB. */ | |
717 | ||
ad4820ab | 718 | if (!gdbarch_vbit_in_delta (gdbarch)) |
0d5de010 | 719 | { |
e17a4113 UW |
720 | store_unsigned_integer (contents, size, byte_order, value | is_virtual); |
721 | store_unsigned_integer (contents + size, size, byte_order, 0); | |
0d5de010 DJ |
722 | } |
723 | else | |
724 | { | |
e17a4113 UW |
725 | store_unsigned_integer (contents, size, byte_order, value); |
726 | store_unsigned_integer (contents + size, size, byte_order, is_virtual); | |
0d5de010 DJ |
727 | } |
728 | } | |
729 | ||
730 | /* GNU v3 implementation of cplus_method_ptr_to_value. */ | |
731 | ||
732 | static struct value * | |
733 | gnuv3_method_ptr_to_value (struct value **this_p, struct value *method_ptr) | |
734 | { | |
ad4820ab | 735 | struct gdbarch *gdbarch; |
0d5de010 DJ |
736 | const gdb_byte *contents = value_contents (method_ptr); |
737 | CORE_ADDR ptr_value; | |
09e2d7c7 | 738 | struct type *self_type, *final_type, *method_type; |
0d5de010 | 739 | LONGEST adjustment; |
0d5de010 DJ |
740 | int vbit; |
741 | ||
09e2d7c7 DE |
742 | self_type = TYPE_SELF_TYPE (check_typedef (value_type (method_ptr))); |
743 | final_type = lookup_pointer_type (self_type); | |
0d5de010 DJ |
744 | |
745 | method_type = TYPE_TARGET_TYPE (check_typedef (value_type (method_ptr))); | |
746 | ||
fead6908 | 747 | /* Extract the pointer to member. */ |
09e2d7c7 | 748 | gdbarch = get_type_arch (self_type); |
ad4820ab | 749 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
750 | |
751 | /* First convert THIS to match the containing type of the pointer to | |
752 | member. This cast may adjust the value of THIS. */ | |
753 | *this_p = value_cast (final_type, *this_p); | |
754 | ||
755 | /* Then apply whatever adjustment is necessary. This creates a somewhat | |
756 | strange pointer: it claims to have type FINAL_TYPE, but in fact it | |
757 | might not be a valid FINAL_TYPE. For instance, it might be a | |
758 | base class of FINAL_TYPE. And if it's not the primary base class, | |
759 | then printing it out as a FINAL_TYPE object would produce some pretty | |
760 | garbage. | |
761 | ||
762 | But we don't really know the type of the first argument in | |
763 | METHOD_TYPE either, which is why this happens. We can't | |
764 | dereference this later as a FINAL_TYPE, but once we arrive in the | |
765 | called method we'll have debugging information for the type of | |
766 | "this" - and that'll match the value we produce here. | |
767 | ||
768 | You can provoke this case by casting a Base::* to a Derived::*, for | |
769 | instance. */ | |
ad4820ab | 770 | *this_p = value_cast (builtin_type (gdbarch)->builtin_data_ptr, *this_p); |
2497b498 | 771 | *this_p = value_ptradd (*this_p, adjustment); |
0d5de010 DJ |
772 | *this_p = value_cast (final_type, *this_p); |
773 | ||
774 | if (vbit) | |
775 | { | |
ad4820ab | 776 | LONGEST voffset; |
d8734c88 | 777 | |
ed09d7da | 778 | voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch)); |
ad4820ab UW |
779 | return gnuv3_get_virtual_fn (gdbarch, value_ind (*this_p), |
780 | method_type, voffset); | |
0d5de010 DJ |
781 | } |
782 | else | |
783 | return value_from_pointer (lookup_pointer_type (method_type), ptr_value); | |
784 | } | |
785 | ||
c4aeac85 TT |
786 | /* Objects of this type are stored in a hash table and a vector when |
787 | printing the vtables for a class. */ | |
788 | ||
789 | struct value_and_voffset | |
790 | { | |
791 | /* The value representing the object. */ | |
792 | struct value *value; | |
793 | ||
794 | /* The maximum vtable offset we've found for any object at this | |
795 | offset in the outermost object. */ | |
796 | int max_voffset; | |
797 | }; | |
798 | ||
c4aeac85 TT |
799 | /* Hash function for value_and_voffset. */ |
800 | ||
801 | static hashval_t | |
802 | hash_value_and_voffset (const void *p) | |
803 | { | |
9a3c8263 | 804 | const struct value_and_voffset *o = (const struct value_and_voffset *) p; |
c4aeac85 TT |
805 | |
806 | return value_address (o->value) + value_embedded_offset (o->value); | |
807 | } | |
808 | ||
809 | /* Equality function for value_and_voffset. */ | |
810 | ||
811 | static int | |
812 | eq_value_and_voffset (const void *a, const void *b) | |
813 | { | |
9a3c8263 SM |
814 | const struct value_and_voffset *ova = (const struct value_and_voffset *) a; |
815 | const struct value_and_voffset *ovb = (const struct value_and_voffset *) b; | |
c4aeac85 TT |
816 | |
817 | return (value_address (ova->value) + value_embedded_offset (ova->value) | |
818 | == value_address (ovb->value) + value_embedded_offset (ovb->value)); | |
819 | } | |
820 | ||
59d3651b | 821 | /* Comparison function for value_and_voffset. */ |
c4aeac85 | 822 | |
59d3651b TT |
823 | static bool |
824 | compare_value_and_voffset (const struct value_and_voffset *va, | |
825 | const struct value_and_voffset *vb) | |
c4aeac85 | 826 | { |
59d3651b TT |
827 | CORE_ADDR addra = (value_address (va->value) |
828 | + value_embedded_offset (va->value)); | |
829 | CORE_ADDR addrb = (value_address (vb->value) | |
830 | + value_embedded_offset (vb->value)); | |
831 | ||
832 | return addra < addrb; | |
c4aeac85 TT |
833 | } |
834 | ||
835 | /* A helper function used when printing vtables. This determines the | |
836 | key (most derived) sub-object at each address and also computes the | |
837 | maximum vtable offset seen for the corresponding vtable. Updates | |
838 | OFFSET_HASH and OFFSET_VEC with a new value_and_voffset object, if | |
839 | needed. VALUE is the object to examine. */ | |
840 | ||
841 | static void | |
842 | compute_vtable_size (htab_t offset_hash, | |
59d3651b | 843 | std::vector<value_and_voffset *> *offset_vec, |
c4aeac85 TT |
844 | struct value *value) |
845 | { | |
846 | int i; | |
847 | struct type *type = check_typedef (value_type (value)); | |
848 | void **slot; | |
849 | struct value_and_voffset search_vo, *current_vo; | |
c4aeac85 | 850 | |
78134374 | 851 | gdb_assert (type->code () == TYPE_CODE_STRUCT); |
5f4ce105 | 852 | |
c4aeac85 TT |
853 | /* If the object is not dynamic, then we are done; as it cannot have |
854 | dynamic base types either. */ | |
855 | if (!gnuv3_dynamic_class (type)) | |
856 | return; | |
857 | ||
858 | /* Update the hash and the vec, if needed. */ | |
859 | search_vo.value = value; | |
860 | slot = htab_find_slot (offset_hash, &search_vo, INSERT); | |
861 | if (*slot) | |
9a3c8263 | 862 | current_vo = (struct value_and_voffset *) *slot; |
c4aeac85 TT |
863 | else |
864 | { | |
865 | current_vo = XNEW (struct value_and_voffset); | |
866 | current_vo->value = value; | |
867 | current_vo->max_voffset = -1; | |
868 | *slot = current_vo; | |
59d3651b | 869 | offset_vec->push_back (current_vo); |
c4aeac85 TT |
870 | } |
871 | ||
872 | /* Update the value_and_voffset object with the highest vtable | |
873 | offset from this class. */ | |
874 | for (i = 0; i < TYPE_NFN_FIELDS (type); ++i) | |
875 | { | |
876 | int j; | |
877 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, i); | |
878 | ||
879 | for (j = 0; j < TYPE_FN_FIELDLIST_LENGTH (type, i); ++j) | |
880 | { | |
881 | if (TYPE_FN_FIELD_VIRTUAL_P (fn, j)) | |
882 | { | |
883 | int voffset = TYPE_FN_FIELD_VOFFSET (fn, j); | |
884 | ||
885 | if (voffset > current_vo->max_voffset) | |
886 | current_vo->max_voffset = voffset; | |
887 | } | |
888 | } | |
889 | } | |
890 | ||
891 | /* Recurse into base classes. */ | |
892 | for (i = 0; i < TYPE_N_BASECLASSES (type); ++i) | |
893 | compute_vtable_size (offset_hash, offset_vec, value_field (value, i)); | |
894 | } | |
895 | ||
896 | /* Helper for gnuv3_print_vtable that prints a single vtable. */ | |
897 | ||
898 | static void | |
899 | print_one_vtable (struct gdbarch *gdbarch, struct value *value, | |
900 | int max_voffset, | |
901 | struct value_print_options *opts) | |
902 | { | |
903 | int i; | |
904 | struct type *type = check_typedef (value_type (value)); | |
905 | struct value *vtable; | |
906 | CORE_ADDR vt_addr; | |
907 | ||
908 | vtable = gnuv3_get_vtable (gdbarch, type, | |
909 | value_address (value) | |
910 | + value_embedded_offset (value)); | |
911 | vt_addr = value_address (value_field (vtable, | |
912 | vtable_field_virtual_functions)); | |
913 | ||
914 | printf_filtered (_("vtable for '%s' @ %s (subobject @ %s):\n"), | |
915 | TYPE_SAFE_NAME (type), | |
916 | paddress (gdbarch, vt_addr), | |
917 | paddress (gdbarch, (value_address (value) | |
918 | + value_embedded_offset (value)))); | |
919 | ||
920 | for (i = 0; i <= max_voffset; ++i) | |
921 | { | |
cafe75b0 JK |
922 | /* Initialize it just to avoid a GCC false warning. */ |
923 | CORE_ADDR addr = 0; | |
492d29ea | 924 | int got_error = 0; |
c4aeac85 | 925 | struct value *vfn; |
c4aeac85 TT |
926 | |
927 | printf_filtered ("[%d]: ", i); | |
928 | ||
929 | vfn = value_subscript (value_field (vtable, | |
930 | vtable_field_virtual_functions), | |
931 | i); | |
932 | ||
933 | if (gdbarch_vtable_function_descriptors (gdbarch)) | |
934 | vfn = value_addr (vfn); | |
935 | ||
a70b8144 | 936 | try |
c4aeac85 TT |
937 | { |
938 | addr = value_as_address (vfn); | |
939 | } | |
230d2906 | 940 | catch (const gdb_exception_error &ex) |
492d29ea | 941 | { |
7f6aba03 TT |
942 | fprintf_styled (gdb_stdout, metadata_style.style (), |
943 | _("<error: %s>"), ex.what ()); | |
492d29ea PA |
944 | got_error = 1; |
945 | } | |
492d29ea PA |
946 | |
947 | if (!got_error) | |
edf0c1b7 | 948 | print_function_pointer_address (opts, gdbarch, addr, gdb_stdout); |
c4aeac85 TT |
949 | printf_filtered ("\n"); |
950 | } | |
951 | } | |
952 | ||
953 | /* Implementation of the print_vtable method. */ | |
954 | ||
955 | static void | |
956 | gnuv3_print_vtable (struct value *value) | |
957 | { | |
958 | struct gdbarch *gdbarch; | |
959 | struct type *type; | |
960 | struct value *vtable; | |
961 | struct value_print_options opts; | |
59d3651b | 962 | int count; |
c4aeac85 TT |
963 | |
964 | value = coerce_ref (value); | |
965 | type = check_typedef (value_type (value)); | |
78134374 | 966 | if (type->code () == TYPE_CODE_PTR) |
c4aeac85 TT |
967 | { |
968 | value = value_ind (value); | |
969 | type = check_typedef (value_type (value)); | |
970 | } | |
971 | ||
972 | get_user_print_options (&opts); | |
973 | ||
974 | /* Respect 'set print object'. */ | |
975 | if (opts.objectprint) | |
976 | { | |
977 | value = value_full_object (value, NULL, 0, 0, 0); | |
978 | type = check_typedef (value_type (value)); | |
979 | } | |
980 | ||
981 | gdbarch = get_type_arch (type); | |
5f4ce105 DE |
982 | |
983 | vtable = NULL; | |
78134374 | 984 | if (type->code () == TYPE_CODE_STRUCT) |
5f4ce105 DE |
985 | vtable = gnuv3_get_vtable (gdbarch, type, |
986 | value_as_address (value_addr (value))); | |
c4aeac85 TT |
987 | |
988 | if (!vtable) | |
989 | { | |
990 | printf_filtered (_("This object does not have a virtual function table\n")); | |
991 | return; | |
992 | } | |
993 | ||
fc4007c9 TT |
994 | htab_up offset_hash (htab_create_alloc (1, hash_value_and_voffset, |
995 | eq_value_and_voffset, | |
996 | xfree, xcalloc, xfree)); | |
59d3651b | 997 | std::vector<value_and_voffset *> result_vec; |
c4aeac85 | 998 | |
fc4007c9 | 999 | compute_vtable_size (offset_hash.get (), &result_vec, value); |
59d3651b TT |
1000 | std::sort (result_vec.begin (), result_vec.end (), |
1001 | compare_value_and_voffset); | |
c4aeac85 TT |
1002 | |
1003 | count = 0; | |
59d3651b | 1004 | for (value_and_voffset *iter : result_vec) |
c4aeac85 TT |
1005 | { |
1006 | if (iter->max_voffset >= 0) | |
1007 | { | |
1008 | if (count > 0) | |
1009 | printf_filtered ("\n"); | |
1010 | print_one_vtable (gdbarch, iter->value, iter->max_voffset, &opts); | |
1011 | ++count; | |
1012 | } | |
1013 | } | |
c4aeac85 TT |
1014 | } |
1015 | ||
6e72ca20 TT |
1016 | /* Return a GDB type representing `struct std::type_info', laid out |
1017 | appropriately for ARCH. | |
1018 | ||
1019 | We use this function as the gdbarch per-architecture data | |
1020 | initialization function. */ | |
1021 | ||
1022 | static void * | |
1023 | build_std_type_info_type (struct gdbarch *arch) | |
1024 | { | |
1025 | struct type *t; | |
1026 | struct field *field_list, *field; | |
1027 | int offset; | |
1028 | struct type *void_ptr_type | |
1029 | = builtin_type (arch)->builtin_data_ptr; | |
1030 | struct type *char_type | |
1031 | = builtin_type (arch)->builtin_char; | |
1032 | struct type *char_ptr_type | |
1033 | = make_pointer_type (make_cv_type (1, 0, char_type, NULL), NULL); | |
1034 | ||
8d749320 | 1035 | field_list = XCNEWVEC (struct field, 2); |
6e72ca20 TT |
1036 | field = &field_list[0]; |
1037 | offset = 0; | |
1038 | ||
1039 | /* The vtable. */ | |
1040 | FIELD_NAME (*field) = "_vptr.type_info"; | |
5d14b6e5 | 1041 | field->set_type (void_ptr_type); |
6e72ca20 | 1042 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 1043 | offset += TYPE_LENGTH (field->type ()); |
6e72ca20 TT |
1044 | field++; |
1045 | ||
1046 | /* The name. */ | |
1047 | FIELD_NAME (*field) = "__name"; | |
5d14b6e5 | 1048 | field->set_type (char_ptr_type); |
6e72ca20 | 1049 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 1050 | offset += TYPE_LENGTH (field->type ()); |
6e72ca20 TT |
1051 | field++; |
1052 | ||
1053 | gdb_assert (field == (field_list + 2)); | |
1054 | ||
77b7c781 | 1055 | t = arch_type (arch, TYPE_CODE_STRUCT, offset * TARGET_CHAR_BIT, NULL); |
5e33d5f4 | 1056 | t->set_num_fields (field - field_list); |
3cabb6b0 | 1057 | t->set_fields (field_list); |
d0e39ea2 | 1058 | t->set_name ("gdb_gnu_v3_type_info"); |
6e72ca20 TT |
1059 | INIT_CPLUS_SPECIFIC (t); |
1060 | ||
1061 | return t; | |
1062 | } | |
1063 | ||
1064 | /* Implement the 'get_typeid_type' method. */ | |
1065 | ||
1066 | static struct type * | |
1067 | gnuv3_get_typeid_type (struct gdbarch *gdbarch) | |
1068 | { | |
1069 | struct symbol *typeinfo; | |
1070 | struct type *typeinfo_type; | |
1071 | ||
d12307c1 PMR |
1072 | typeinfo = lookup_symbol ("std::type_info", NULL, STRUCT_DOMAIN, |
1073 | NULL).symbol; | |
6e72ca20 | 1074 | if (typeinfo == NULL) |
9a3c8263 SM |
1075 | typeinfo_type |
1076 | = (struct type *) gdbarch_data (gdbarch, std_type_info_gdbarch_data); | |
6e72ca20 TT |
1077 | else |
1078 | typeinfo_type = SYMBOL_TYPE (typeinfo); | |
1079 | ||
1080 | return typeinfo_type; | |
1081 | } | |
1082 | ||
1083 | /* Implement the 'get_typeid' method. */ | |
1084 | ||
1085 | static struct value * | |
1086 | gnuv3_get_typeid (struct value *value) | |
1087 | { | |
1088 | struct type *typeinfo_type; | |
1089 | struct type *type; | |
1090 | struct gdbarch *gdbarch; | |
6e72ca20 | 1091 | struct value *result; |
596dc4ad TT |
1092 | std::string type_name; |
1093 | gdb::unique_xmalloc_ptr<char> canonical; | |
6e72ca20 TT |
1094 | |
1095 | /* We have to handle values a bit trickily here, to allow this code | |
1096 | to work properly with non_lvalue values that are really just | |
1097 | disguised types. */ | |
1098 | if (value_lval_const (value) == lval_memory) | |
1099 | value = coerce_ref (value); | |
1100 | ||
1101 | type = check_typedef (value_type (value)); | |
1102 | ||
1103 | /* In the non_lvalue case, a reference might have slipped through | |
1104 | here. */ | |
78134374 | 1105 | if (type->code () == TYPE_CODE_REF) |
6e72ca20 TT |
1106 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
1107 | ||
1108 | /* Ignore top-level cv-qualifiers. */ | |
1109 | type = make_cv_type (0, 0, type, NULL); | |
1110 | gdbarch = get_type_arch (type); | |
1111 | ||
fe978cb0 | 1112 | type_name = type_to_string (type); |
2f408ecb | 1113 | if (type_name.empty ()) |
6e72ca20 | 1114 | error (_("cannot find typeinfo for unnamed type")); |
6e72ca20 TT |
1115 | |
1116 | /* We need to canonicalize the type name here, because we do lookups | |
1117 | using the demangled name, and so we must match the format it | |
1118 | uses. E.g., GDB tends to use "const char *" as a type name, but | |
1119 | the demangler uses "char const *". */ | |
2f408ecb | 1120 | canonical = cp_canonicalize_string (type_name.c_str ()); |
596dc4ad TT |
1121 | const char *name = (canonical == nullptr |
1122 | ? type_name.c_str () | |
1123 | : canonical.get ()); | |
6e72ca20 TT |
1124 | |
1125 | typeinfo_type = gnuv3_get_typeid_type (gdbarch); | |
1126 | ||
1127 | /* We check for lval_memory because in the "typeid (type-id)" case, | |
1128 | the type is passed via a not_lval value object. */ | |
78134374 | 1129 | if (type->code () == TYPE_CODE_STRUCT |
6e72ca20 TT |
1130 | && value_lval_const (value) == lval_memory |
1131 | && gnuv3_dynamic_class (type)) | |
1132 | { | |
1133 | struct value *vtable, *typeinfo_value; | |
1134 | CORE_ADDR address = value_address (value) + value_embedded_offset (value); | |
1135 | ||
1136 | vtable = gnuv3_get_vtable (gdbarch, type, address); | |
1137 | if (vtable == NULL) | |
2f408ecb | 1138 | error (_("cannot find typeinfo for object of type '%s'"), |
596dc4ad | 1139 | name); |
6e72ca20 TT |
1140 | typeinfo_value = value_field (vtable, vtable_field_type_info); |
1141 | result = value_ind (value_cast (make_pointer_type (typeinfo_type, NULL), | |
1142 | typeinfo_value)); | |
1143 | } | |
1144 | else | |
1145 | { | |
596dc4ad | 1146 | std::string sym_name = std::string ("typeinfo for ") + name; |
2f408ecb PA |
1147 | bound_minimal_symbol minsym |
1148 | = lookup_minimal_symbol (sym_name.c_str (), NULL, NULL); | |
6e72ca20 | 1149 | |
3b7344d5 | 1150 | if (minsym.minsym == NULL) |
596dc4ad | 1151 | error (_("could not find typeinfo symbol for '%s'"), name); |
6e72ca20 | 1152 | |
77e371c0 | 1153 | result = value_at_lazy (typeinfo_type, BMSYMBOL_VALUE_ADDRESS (minsym)); |
6e72ca20 TT |
1154 | } |
1155 | ||
6e72ca20 TT |
1156 | return result; |
1157 | } | |
1158 | ||
cc16e6c9 | 1159 | /* Implement the 'get_typename_from_type_info' method. */ |
72f1fe8a | 1160 | |
2f408ecb | 1161 | static std::string |
72f1fe8a TT |
1162 | gnuv3_get_typename_from_type_info (struct value *type_info_ptr) |
1163 | { | |
1164 | struct gdbarch *gdbarch = get_type_arch (value_type (type_info_ptr)); | |
1165 | struct bound_minimal_symbol typeinfo_sym; | |
1166 | CORE_ADDR addr; | |
1167 | const char *symname; | |
1168 | const char *class_name; | |
1169 | const char *atsign; | |
1170 | ||
1171 | addr = value_as_address (type_info_ptr); | |
1172 | typeinfo_sym = lookup_minimal_symbol_by_pc (addr); | |
1173 | if (typeinfo_sym.minsym == NULL) | |
1174 | error (_("could not find minimal symbol for typeinfo address %s"), | |
1175 | paddress (gdbarch, addr)); | |
1176 | ||
1177 | #define TYPEINFO_PREFIX "typeinfo for " | |
1178 | #define TYPEINFO_PREFIX_LEN (sizeof (TYPEINFO_PREFIX) - 1) | |
c9d95fa3 | 1179 | symname = typeinfo_sym.minsym->demangled_name (); |
72f1fe8a TT |
1180 | if (symname == NULL || strncmp (symname, TYPEINFO_PREFIX, |
1181 | TYPEINFO_PREFIX_LEN)) | |
1182 | error (_("typeinfo symbol '%s' has unexpected name"), | |
c9d95fa3 | 1183 | typeinfo_sym.minsym->linkage_name ()); |
72f1fe8a TT |
1184 | class_name = symname + TYPEINFO_PREFIX_LEN; |
1185 | ||
1186 | /* Strip off @plt and version suffixes. */ | |
1187 | atsign = strchr (class_name, '@'); | |
1188 | if (atsign != NULL) | |
2f408ecb PA |
1189 | return std::string (class_name, atsign - class_name); |
1190 | return class_name; | |
72f1fe8a TT |
1191 | } |
1192 | ||
1193 | /* Implement the 'get_type_from_type_info' method. */ | |
1194 | ||
1195 | static struct type * | |
1196 | gnuv3_get_type_from_type_info (struct value *type_info_ptr) | |
1197 | { | |
72f1fe8a TT |
1198 | /* We have to parse the type name, since in general there is not a |
1199 | symbol for a type. This is somewhat bogus since there may be a | |
1200 | mis-parse. Another approach might be to re-use the demangler's | |
1201 | internal form to reconstruct the type somehow. */ | |
2f408ecb PA |
1202 | std::string type_name = gnuv3_get_typename_from_type_info (type_info_ptr); |
1203 | expression_up expr (parse_expression (type_name.c_str ())); | |
1204 | struct value *type_val = evaluate_type (expr.get ()); | |
1205 | return value_type (type_val); | |
72f1fe8a TT |
1206 | } |
1207 | ||
b18be20d DJ |
1208 | /* Determine if we are currently in a C++ thunk. If so, get the address |
1209 | of the routine we are thunking to and continue to there instead. */ | |
1210 | ||
1211 | static CORE_ADDR | |
52f729a7 | 1212 | gnuv3_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc) |
b18be20d | 1213 | { |
a513d1e8 | 1214 | CORE_ADDR real_stop_pc, method_stop_pc, func_addr; |
9970f04b | 1215 | struct gdbarch *gdbarch = get_frame_arch (frame); |
3b7344d5 | 1216 | struct bound_minimal_symbol thunk_sym, fn_sym; |
b18be20d | 1217 | struct obj_section *section; |
0d5cff50 | 1218 | const char *thunk_name, *fn_name; |
b18be20d | 1219 | |
9970f04b | 1220 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
b18be20d DJ |
1221 | if (real_stop_pc == 0) |
1222 | real_stop_pc = stop_pc; | |
1223 | ||
1224 | /* Find the linker symbol for this potential thunk. */ | |
3b7344d5 | 1225 | thunk_sym = lookup_minimal_symbol_by_pc (real_stop_pc); |
b18be20d | 1226 | section = find_pc_section (real_stop_pc); |
3b7344d5 | 1227 | if (thunk_sym.minsym == NULL || section == NULL) |
b18be20d DJ |
1228 | return 0; |
1229 | ||
1230 | /* The symbol's demangled name should be something like "virtual | |
1231 | thunk to FUNCTION", where FUNCTION is the name of the function | |
1232 | being thunked to. */ | |
c9d95fa3 | 1233 | thunk_name = thunk_sym.minsym->demangled_name (); |
b18be20d DJ |
1234 | if (thunk_name == NULL || strstr (thunk_name, " thunk to ") == NULL) |
1235 | return 0; | |
1236 | ||
1237 | fn_name = strstr (thunk_name, " thunk to ") + strlen (" thunk to "); | |
1238 | fn_sym = lookup_minimal_symbol (fn_name, NULL, section->objfile); | |
3b7344d5 | 1239 | if (fn_sym.minsym == NULL) |
b18be20d DJ |
1240 | return 0; |
1241 | ||
77e371c0 | 1242 | method_stop_pc = BMSYMBOL_VALUE_ADDRESS (fn_sym); |
a513d1e8 LM |
1243 | |
1244 | /* Some targets have minimal symbols pointing to function descriptors | |
1245 | (powerpc 64 for example). Make sure to retrieve the address | |
1246 | of the real function from the function descriptor before passing on | |
1247 | the address to other layers of GDB. */ | |
1248 | func_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, method_stop_pc, | |
8b88a78e | 1249 | current_top_target ()); |
a513d1e8 LM |
1250 | if (func_addr != 0) |
1251 | method_stop_pc = func_addr; | |
1252 | ||
e76f05fa | 1253 | real_stop_pc = gdbarch_skip_trampoline_code |
9970f04b | 1254 | (gdbarch, frame, method_stop_pc); |
b18be20d DJ |
1255 | if (real_stop_pc == 0) |
1256 | real_stop_pc = method_stop_pc; | |
1257 | ||
1258 | return real_stop_pc; | |
1259 | } | |
1260 | ||
62bf63d7 TBA |
1261 | /* A member function is in one these states. */ |
1262 | ||
1263 | enum definition_style | |
1264 | { | |
1265 | DOES_NOT_EXIST_IN_SOURCE, | |
1266 | DEFAULTED_INSIDE, | |
1267 | DEFAULTED_OUTSIDE, | |
1268 | DELETED, | |
1269 | EXPLICIT, | |
1270 | }; | |
1271 | ||
1272 | /* Return how the given field is defined. */ | |
1273 | ||
1274 | static definition_style | |
1275 | get_def_style (struct fn_field *fn, int fieldelem) | |
1276 | { | |
1277 | if (TYPE_FN_FIELD_DELETED (fn, fieldelem)) | |
1278 | return DELETED; | |
1279 | ||
1280 | if (TYPE_FN_FIELD_ARTIFICIAL (fn, fieldelem)) | |
1281 | return DOES_NOT_EXIST_IN_SOURCE; | |
1282 | ||
1283 | switch (TYPE_FN_FIELD_DEFAULTED (fn, fieldelem)) | |
1284 | { | |
1285 | case DW_DEFAULTED_no: | |
1286 | return EXPLICIT; | |
1287 | case DW_DEFAULTED_in_class: | |
1288 | return DEFAULTED_INSIDE; | |
1289 | case DW_DEFAULTED_out_of_class: | |
1290 | return DEFAULTED_OUTSIDE; | |
1291 | default: | |
1292 | break; | |
1293 | } | |
1294 | ||
1295 | return EXPLICIT; | |
1296 | } | |
1297 | ||
1298 | /* Helper functions to determine whether the given definition style | |
1299 | denotes that the definition is user-provided or implicit. | |
1300 | Being defaulted outside the class decl counts as an explicit | |
1301 | user-definition, while being defaulted inside is implicit. */ | |
1302 | ||
1303 | static bool | |
1304 | is_user_provided_def (definition_style def) | |
1305 | { | |
1306 | return def == EXPLICIT || def == DEFAULTED_OUTSIDE; | |
1307 | } | |
1308 | ||
1309 | static bool | |
1310 | is_implicit_def (definition_style def) | |
1311 | { | |
1312 | return def == DOES_NOT_EXIST_IN_SOURCE || def == DEFAULTED_INSIDE; | |
1313 | } | |
1314 | ||
1315 | /* Helper function to decide if METHOD_TYPE is a copy/move | |
1316 | constructor type for CLASS_TYPE. EXPECTED is the expected | |
1317 | type code for the "right-hand-side" argument. | |
1318 | This function is supposed to be used by the IS_COPY_CONSTRUCTOR_TYPE | |
1319 | and IS_MOVE_CONSTRUCTOR_TYPE functions below. Normally, you should | |
1320 | not need to call this directly. */ | |
1321 | ||
1322 | static bool | |
1323 | is_copy_or_move_constructor_type (struct type *class_type, | |
1324 | struct type *method_type, | |
1325 | type_code expected) | |
1326 | { | |
1327 | /* The method should take at least two arguments... */ | |
1f704f76 | 1328 | if (method_type->num_fields () < 2) |
62bf63d7 TBA |
1329 | return false; |
1330 | ||
1331 | /* ...and the second argument should be the same as the class | |
1332 | type, with the expected type code... */ | |
940da03e | 1333 | struct type *arg_type = method_type->field (1).type (); |
62bf63d7 | 1334 | |
78134374 | 1335 | if (arg_type->code () != expected) |
62bf63d7 TBA |
1336 | return false; |
1337 | ||
1338 | struct type *target = check_typedef (TYPE_TARGET_TYPE (arg_type)); | |
1339 | if (!(class_types_same_p (target, class_type))) | |
1340 | return false; | |
1341 | ||
1342 | /* ...and if any of the remaining arguments don't have a default value | |
1343 | then this is not a copy or move constructor, but just a | |
1344 | constructor. */ | |
1f704f76 | 1345 | for (int i = 2; i < method_type->num_fields (); i++) |
62bf63d7 | 1346 | { |
940da03e | 1347 | arg_type = method_type->field (i).type (); |
62bf63d7 TBA |
1348 | /* FIXME aktemur/2019-10-31: As of this date, neither |
1349 | clang++-7.0.0 nor g++-8.2.0 produce a DW_AT_default_value | |
1350 | attribute. GDB is also not set to read this attribute, yet. | |
1351 | Hence, we immediately return false if there are more than | |
1352 | 2 parameters. | |
1353 | GCC bug link: | |
1354 | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42959 | |
1355 | */ | |
1356 | return false; | |
1357 | } | |
1358 | ||
1359 | return true; | |
1360 | } | |
1361 | ||
1362 | /* Return true if METHOD_TYPE is a copy ctor type for CLASS_TYPE. */ | |
1363 | ||
1364 | static bool | |
1365 | is_copy_constructor_type (struct type *class_type, | |
1366 | struct type *method_type) | |
1367 | { | |
1368 | return is_copy_or_move_constructor_type (class_type, method_type, | |
1369 | TYPE_CODE_REF); | |
1370 | } | |
1371 | ||
1372 | /* Return true if METHOD_TYPE is a move ctor type for CLASS_TYPE. */ | |
1373 | ||
1374 | static bool | |
1375 | is_move_constructor_type (struct type *class_type, | |
1376 | struct type *method_type) | |
1377 | { | |
1378 | return is_copy_or_move_constructor_type (class_type, method_type, | |
1379 | TYPE_CODE_RVALUE_REF); | |
1380 | } | |
1381 | ||
9d084466 | 1382 | /* Return pass-by-reference information for the given TYPE. |
41f1b697 DJ |
1383 | |
1384 | The rule in the v3 ABI document comes from section 3.1.1. If the | |
1385 | type has a non-trivial copy constructor or destructor, then the | |
1386 | caller must make a copy (by calling the copy constructor if there | |
1387 | is one or perform the copy itself otherwise), pass the address of | |
1388 | the copy, and then destroy the temporary (if necessary). | |
1389 | ||
62bf63d7 | 1390 | For return values with non-trivial copy/move constructors or |
41f1b697 DJ |
1391 | destructors, space will be allocated in the caller, and a pointer |
1392 | will be passed as the first argument (preceding "this"). | |
1393 | ||
1394 | We don't have a bulletproof mechanism for determining whether a | |
62bf63d7 TBA |
1395 | constructor or destructor is trivial. For GCC and DWARF5 debug |
1396 | information, we can check the calling_convention attribute, | |
1397 | the 'artificial' flag, the 'defaulted' attribute, and the | |
1398 | 'deleted' attribute. */ | |
9d084466 TBA |
1399 | |
1400 | static struct language_pass_by_ref_info | |
41f1b697 DJ |
1401 | gnuv3_pass_by_reference (struct type *type) |
1402 | { | |
1403 | int fieldnum, fieldelem; | |
1404 | ||
f168693b | 1405 | type = check_typedef (type); |
41f1b697 | 1406 | |
9d084466 | 1407 | /* Start with the default values. */ |
48448202 | 1408 | struct language_pass_by_ref_info info; |
9d084466 | 1409 | |
62bf63d7 TBA |
1410 | bool has_cc_attr = false; |
1411 | bool is_pass_by_value = false; | |
1412 | bool is_dynamic = false; | |
1413 | definition_style cctor_def = DOES_NOT_EXIST_IN_SOURCE; | |
1414 | definition_style dtor_def = DOES_NOT_EXIST_IN_SOURCE; | |
1415 | definition_style mctor_def = DOES_NOT_EXIST_IN_SOURCE; | |
9d084466 | 1416 | |
41f1b697 | 1417 | /* We're only interested in things that can have methods. */ |
78134374 SM |
1418 | if (type->code () != TYPE_CODE_STRUCT |
1419 | && type->code () != TYPE_CODE_UNION) | |
9d084466 | 1420 | return info; |
41f1b697 | 1421 | |
62bf63d7 TBA |
1422 | /* The compiler may have emitted the calling convention attribute. |
1423 | Note: GCC does not produce this attribute as of version 9.2.1. | |
1424 | Bug link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92418 */ | |
1425 | if (TYPE_CPLUS_CALLING_CONVENTION (type) == DW_CC_pass_by_value) | |
1426 | { | |
1427 | has_cc_attr = true; | |
1428 | is_pass_by_value = true; | |
1429 | /* Do not return immediately. We have to find out if this type | |
1430 | is copy_constructible and destructible. */ | |
1431 | } | |
1432 | ||
1433 | if (TYPE_CPLUS_CALLING_CONVENTION (type) == DW_CC_pass_by_reference) | |
1434 | { | |
1435 | has_cc_attr = true; | |
1436 | is_pass_by_value = false; | |
1437 | } | |
1438 | ||
ebb8ece2 SC |
1439 | /* A dynamic class has a non-trivial copy constructor. |
1440 | See c++98 section 12.8 Copying class objects [class.copy]. */ | |
1441 | if (gnuv3_dynamic_class (type)) | |
62bf63d7 | 1442 | is_dynamic = true; |
ebb8ece2 | 1443 | |
41f1b697 DJ |
1444 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) |
1445 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
1446 | fieldelem++) | |
1447 | { | |
1448 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
0d5cff50 | 1449 | const char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum); |
41f1b697 DJ |
1450 | struct type *fieldtype = TYPE_FN_FIELD_TYPE (fn, fieldelem); |
1451 | ||
41f1b697 | 1452 | if (name[0] == '~') |
9d084466 | 1453 | { |
62bf63d7 TBA |
1454 | /* We've found a destructor. |
1455 | There should be at most one dtor definition. */ | |
1456 | gdb_assert (dtor_def == DOES_NOT_EXIST_IN_SOURCE); | |
1457 | dtor_def = get_def_style (fn, fieldelem); | |
9d084466 | 1458 | } |
62bf63d7 TBA |
1459 | else if (is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem)) |
1460 | || TYPE_FN_FIELD_CONSTRUCTOR (fn, fieldelem)) | |
82c48ac7 | 1461 | { |
62bf63d7 TBA |
1462 | /* FIXME drow/2007-09-23: We could do this using the name of |
1463 | the method and the name of the class instead of dealing | |
1464 | with the mangled name. We don't have a convenient function | |
1465 | to strip off both leading scope qualifiers and trailing | |
1466 | template arguments yet. */ | |
1467 | if (is_copy_constructor_type (type, fieldtype)) | |
1468 | { | |
1469 | /* There may be more than one cctors. E.g.: one that | |
1470 | take a const parameter and another that takes a | |
1471 | non-const parameter. Such as: | |
1472 | ||
1473 | class K { | |
1474 | K (const K &k)... | |
1475 | K (K &k)... | |
1476 | }; | |
1477 | ||
1478 | It is sufficient for the type to be non-trivial | |
1479 | even only one of the cctors is explicit. | |
1480 | Therefore, update the cctor_def value in the | |
1481 | implicit -> explicit direction, not backwards. */ | |
1482 | ||
1483 | if (is_implicit_def (cctor_def)) | |
1484 | cctor_def = get_def_style (fn, fieldelem); | |
1485 | } | |
1486 | else if (is_move_constructor_type (type, fieldtype)) | |
3433cfa5 | 1487 | { |
62bf63d7 TBA |
1488 | /* Again, there may be multiple move ctors. Update the |
1489 | mctor_def value if we found an explicit def and the | |
1490 | existing one is not explicit. Otherwise retain the | |
1491 | existing value. */ | |
1492 | if (is_implicit_def (mctor_def)) | |
1493 | mctor_def = get_def_style (fn, fieldelem); | |
3433cfa5 | 1494 | } |
82c48ac7 | 1495 | } |
41f1b697 DJ |
1496 | } |
1497 | ||
62bf63d7 TBA |
1498 | bool cctor_implicitly_deleted |
1499 | = (mctor_def != DOES_NOT_EXIST_IN_SOURCE | |
1500 | && cctor_def == DOES_NOT_EXIST_IN_SOURCE); | |
1501 | ||
1502 | bool cctor_explicitly_deleted = (cctor_def == DELETED); | |
1503 | ||
1504 | if (cctor_implicitly_deleted || cctor_explicitly_deleted) | |
1505 | info.copy_constructible = false; | |
1506 | ||
1507 | if (dtor_def == DELETED) | |
1508 | info.destructible = false; | |
1509 | ||
1510 | info.trivially_destructible = is_implicit_def (dtor_def); | |
1511 | ||
1512 | info.trivially_copy_constructible | |
1513 | = (is_implicit_def (cctor_def) | |
1514 | && !is_dynamic); | |
1515 | ||
1516 | info.trivially_copyable | |
1517 | = (info.trivially_copy_constructible | |
1518 | && info.trivially_destructible | |
1519 | && !is_user_provided_def (mctor_def)); | |
1520 | ||
41f1b697 DJ |
1521 | /* Even if all the constructors and destructors were artificial, one |
1522 | of them may have invoked a non-artificial constructor or | |
1523 | destructor in a base class. If any base class needs to be passed | |
1524 | by reference, so does this class. Similarly for members, which | |
1525 | are constructed whenever this class is. We do not need to worry | |
1526 | about recursive loops here, since we are only looking at members | |
bceffbf3 | 1527 | of complete class type. Also ignore any static members. */ |
1f704f76 | 1528 | for (fieldnum = 0; fieldnum < type->num_fields (); fieldnum++) |
ceacbf6e | 1529 | if (!field_is_static (&type->field (fieldnum))) |
9d084466 | 1530 | { |
940da03e | 1531 | struct type *field_type = type->field (fieldnum).type (); |
62bf63d7 TBA |
1532 | |
1533 | /* For arrays, make the decision based on the element type. */ | |
78134374 | 1534 | if (field_type->code () == TYPE_CODE_ARRAY) |
62bf63d7 TBA |
1535 | field_type = check_typedef (TYPE_TARGET_TYPE (field_type)); |
1536 | ||
9d084466 | 1537 | struct language_pass_by_ref_info field_info |
62bf63d7 TBA |
1538 | = gnuv3_pass_by_reference (field_type); |
1539 | ||
1540 | if (!field_info.copy_constructible) | |
1541 | info.copy_constructible = false; | |
1542 | if (!field_info.destructible) | |
1543 | info.destructible = false; | |
9d084466 | 1544 | if (!field_info.trivially_copyable) |
62bf63d7 TBA |
1545 | info.trivially_copyable = false; |
1546 | if (!field_info.trivially_copy_constructible) | |
1547 | info.trivially_copy_constructible = false; | |
1548 | if (!field_info.trivially_destructible) | |
1549 | info.trivially_destructible = false; | |
9d084466 | 1550 | } |
41f1b697 | 1551 | |
62bf63d7 TBA |
1552 | /* Consistency check. */ |
1553 | if (has_cc_attr && info.trivially_copyable != is_pass_by_value) | |
1554 | { | |
1555 | /* DWARF CC attribute is not the same as the inferred value; | |
1556 | use the DWARF attribute. */ | |
1557 | info.trivially_copyable = is_pass_by_value; | |
1558 | } | |
1559 | ||
9d084466 | 1560 | return info; |
41f1b697 DJ |
1561 | } |
1562 | ||
7ed49443 JB |
1563 | static void |
1564 | init_gnuv3_ops (void) | |
1565 | { | |
0963b4bd MS |
1566 | vtable_type_gdbarch_data |
1567 | = gdbarch_data_register_post_init (build_gdb_vtable_type); | |
6e72ca20 TT |
1568 | std_type_info_gdbarch_data |
1569 | = gdbarch_data_register_post_init (build_std_type_info_type); | |
7ed49443 JB |
1570 | |
1571 | gnu_v3_abi_ops.shortname = "gnu-v3"; | |
1572 | gnu_v3_abi_ops.longname = "GNU G++ Version 3 ABI"; | |
1573 | gnu_v3_abi_ops.doc = "G++ Version 3 ABI"; | |
358777b0 EZ |
1574 | gnu_v3_abi_ops.is_destructor_name = |
1575 | (enum dtor_kinds (*) (const char *))is_gnu_v3_mangled_dtor; | |
1576 | gnu_v3_abi_ops.is_constructor_name = | |
1577 | (enum ctor_kinds (*) (const char *))is_gnu_v3_mangled_ctor; | |
7ed49443 JB |
1578 | gnu_v3_abi_ops.is_vtable_name = gnuv3_is_vtable_name; |
1579 | gnu_v3_abi_ops.is_operator_name = gnuv3_is_operator_name; | |
1580 | gnu_v3_abi_ops.rtti_type = gnuv3_rtti_type; | |
1581 | gnu_v3_abi_ops.virtual_fn_field = gnuv3_virtual_fn_field; | |
1514d34e | 1582 | gnu_v3_abi_ops.baseclass_offset = gnuv3_baseclass_offset; |
0d5de010 DJ |
1583 | gnu_v3_abi_ops.print_method_ptr = gnuv3_print_method_ptr; |
1584 | gnu_v3_abi_ops.method_ptr_size = gnuv3_method_ptr_size; | |
1585 | gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr; | |
1586 | gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value; | |
c4aeac85 | 1587 | gnu_v3_abi_ops.print_vtable = gnuv3_print_vtable; |
6e72ca20 TT |
1588 | gnu_v3_abi_ops.get_typeid = gnuv3_get_typeid; |
1589 | gnu_v3_abi_ops.get_typeid_type = gnuv3_get_typeid_type; | |
72f1fe8a | 1590 | gnu_v3_abi_ops.get_type_from_type_info = gnuv3_get_type_from_type_info; |
cc16e6c9 TT |
1591 | gnu_v3_abi_ops.get_typename_from_type_info |
1592 | = gnuv3_get_typename_from_type_info; | |
b18be20d | 1593 | gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline; |
41f1b697 | 1594 | gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference; |
7ed49443 JB |
1595 | } |
1596 | ||
6c265988 | 1597 | void _initialize_gnu_v3_abi (); |
7ed49443 | 1598 | void |
6c265988 | 1599 | _initialize_gnu_v3_abi () |
7ed49443 JB |
1600 | { |
1601 | init_gnuv3_ops (); | |
1602 | ||
fe1f4a5e | 1603 | register_cp_abi (&gnu_v3_abi_ops); |
1605ef26 | 1604 | set_cp_abi_as_auto_default (gnu_v3_abi_ops.shortname); |
7ed49443 | 1605 | } |