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7ed49443 JB |
1 | /* Abstraction of GNU v3 abi. |
2 | Contributed by Jim Blandy <jimb@redhat.com> | |
451fbdda | 3 | |
3666a048 | 4 | Copyright (C) 2001-2021 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" |
328d42d8 | 34 | #include "inferior.h" |
0d5de010 | 35 | |
b27b8843 | 36 | static struct cp_abi_ops gnu_v3_abi_ops; |
7ed49443 | 37 | |
6e72ca20 TT |
38 | /* A gdbarch key for std::type_info, in the event that it can't be |
39 | found in the debug info. */ | |
40 | ||
41 | static struct gdbarch_data *std_type_info_gdbarch_data; | |
42 | ||
43 | ||
7ed49443 JB |
44 | static int |
45 | gnuv3_is_vtable_name (const char *name) | |
46 | { | |
61012eef | 47 | return startswith (name, "_ZTV"); |
7ed49443 JB |
48 | } |
49 | ||
50 | static int | |
51 | gnuv3_is_operator_name (const char *name) | |
52 | { | |
8090b426 | 53 | return startswith (name, CP_OPERATOR_STR); |
7ed49443 JB |
54 | } |
55 | ||
56 | ||
57 | /* To help us find the components of a vtable, we build ourselves a | |
58 | GDB type object representing the vtable structure. Following the | |
59 | V3 ABI, it goes something like this: | |
60 | ||
61 | struct gdb_gnu_v3_abi_vtable { | |
62 | ||
63 | / * An array of virtual call and virtual base offsets. The real | |
dda83cd7 SM |
64 | length of this array depends on the class hierarchy; we use |
65 | negative subscripts to access the elements. Yucky, but | |
66 | better than the alternatives. * / | |
7ed49443 JB |
67 | ptrdiff_t vcall_and_vbase_offsets[0]; |
68 | ||
69 | / * The offset from a virtual pointer referring to this table | |
dda83cd7 | 70 | to the top of the complete object. * / |
7ed49443 JB |
71 | ptrdiff_t offset_to_top; |
72 | ||
73 | / * The type_info pointer for this class. This is really a | |
dda83cd7 SM |
74 | std::type_info *, but GDB doesn't really look at the |
75 | type_info object itself, so we don't bother to get the type | |
76 | exactly right. * / | |
7ed49443 JB |
77 | void *type_info; |
78 | ||
79 | / * Virtual table pointers in objects point here. * / | |
80 | ||
81 | / * Virtual function pointers. Like the vcall/vbase array, the | |
dda83cd7 | 82 | real length of this table depends on the class hierarchy. * / |
7ed49443 JB |
83 | void (*virtual_functions[0]) (); |
84 | ||
85 | }; | |
86 | ||
87 | The catch, of course, is that the exact layout of this table | |
88 | depends on the ABI --- word size, endianness, alignment, etc. So | |
89 | the GDB type object is actually a per-architecture kind of thing. | |
90 | ||
91 | vtable_type_gdbarch_data is a gdbarch per-architecture data pointer | |
92 | which refers to the struct type * for this structure, laid out | |
93 | appropriately for the architecture. */ | |
b27b8843 | 94 | static struct gdbarch_data *vtable_type_gdbarch_data; |
7ed49443 JB |
95 | |
96 | ||
97 | /* Human-readable names for the numbers of the fields above. */ | |
98 | enum { | |
99 | vtable_field_vcall_and_vbase_offsets, | |
100 | vtable_field_offset_to_top, | |
101 | vtable_field_type_info, | |
102 | vtable_field_virtual_functions | |
103 | }; | |
104 | ||
105 | ||
106 | /* Return a GDB type representing `struct gdb_gnu_v3_abi_vtable', | |
107 | described above, laid out appropriately for ARCH. | |
108 | ||
109 | We use this function as the gdbarch per-architecture data | |
9970f04b | 110 | initialization function. */ |
7ed49443 JB |
111 | static void * |
112 | build_gdb_vtable_type (struct gdbarch *arch) | |
113 | { | |
114 | struct type *t; | |
115 | struct field *field_list, *field; | |
116 | int offset; | |
117 | ||
118 | struct type *void_ptr_type | |
fde6c819 | 119 | = builtin_type (arch)->builtin_data_ptr; |
7ed49443 | 120 | struct type *ptr_to_void_fn_type |
fde6c819 | 121 | = builtin_type (arch)->builtin_func_ptr; |
7ed49443 JB |
122 | |
123 | /* ARCH can't give us the true ptrdiff_t type, so we guess. */ | |
124 | struct type *ptrdiff_type | |
e9bb382b | 125 | = arch_integer_type (arch, gdbarch_ptr_bit (arch), 0, "ptrdiff_t"); |
7ed49443 JB |
126 | |
127 | /* We assume no padding is necessary, since GDB doesn't know | |
128 | anything about alignment at the moment. If this assumption bites | |
129 | us, we should add a gdbarch method which, given a type, returns | |
130 | the alignment that type requires, and then use that here. */ | |
131 | ||
132 | /* Build the field list. */ | |
8d749320 | 133 | field_list = XCNEWVEC (struct field, 4); |
7ed49443 JB |
134 | field = &field_list[0]; |
135 | offset = 0; | |
136 | ||
137 | /* ptrdiff_t vcall_and_vbase_offsets[0]; */ | |
138 | FIELD_NAME (*field) = "vcall_and_vbase_offsets"; | |
5d14b6e5 | 139 | field->set_type (lookup_array_range_type (ptrdiff_type, 0, -1)); |
f41f5e61 | 140 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 141 | offset += TYPE_LENGTH (field->type ()); |
7ed49443 JB |
142 | field++; |
143 | ||
144 | /* ptrdiff_t offset_to_top; */ | |
145 | FIELD_NAME (*field) = "offset_to_top"; | |
5d14b6e5 | 146 | field->set_type (ptrdiff_type); |
f41f5e61 | 147 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 148 | offset += TYPE_LENGTH (field->type ()); |
7ed49443 JB |
149 | field++; |
150 | ||
151 | /* void *type_info; */ | |
152 | FIELD_NAME (*field) = "type_info"; | |
5d14b6e5 | 153 | field->set_type (void_ptr_type); |
f41f5e61 | 154 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 155 | offset += TYPE_LENGTH (field->type ()); |
7ed49443 JB |
156 | field++; |
157 | ||
158 | /* void (*virtual_functions[0]) (); */ | |
159 | FIELD_NAME (*field) = "virtual_functions"; | |
5d14b6e5 | 160 | field->set_type (lookup_array_range_type (ptr_to_void_fn_type, 0, -1)); |
f41f5e61 | 161 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 162 | offset += TYPE_LENGTH (field->type ()); |
7ed49443 JB |
163 | field++; |
164 | ||
165 | /* We assumed in the allocation above that there were four fields. */ | |
3d499020 | 166 | gdb_assert (field == (field_list + 4)); |
7ed49443 | 167 | |
77b7c781 | 168 | t = arch_type (arch, TYPE_CODE_STRUCT, offset * TARGET_CHAR_BIT, NULL); |
5e33d5f4 | 169 | t->set_num_fields (field - field_list); |
3cabb6b0 | 170 | t->set_fields (field_list); |
d0e39ea2 | 171 | t->set_name ("gdb_gnu_v3_abi_vtable"); |
e9bb382b | 172 | INIT_CPLUS_SPECIFIC (t); |
7ed49443 | 173 | |
706d0883 | 174 | return make_type_with_address_space (t, TYPE_INSTANCE_FLAG_CODE_SPACE); |
7ed49443 JB |
175 | } |
176 | ||
177 | ||
ed09d7da KB |
178 | /* Return the ptrdiff_t type used in the vtable type. */ |
179 | static struct type * | |
180 | vtable_ptrdiff_type (struct gdbarch *gdbarch) | |
181 | { | |
9a3c8263 SM |
182 | struct type *vtable_type |
183 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
ed09d7da KB |
184 | |
185 | /* The "offset_to_top" field has the appropriate (ptrdiff_t) type. */ | |
940da03e | 186 | return vtable_type->field (vtable_field_offset_to_top).type (); |
ed09d7da KB |
187 | } |
188 | ||
7ed49443 JB |
189 | /* Return the offset from the start of the imaginary `struct |
190 | gdb_gnu_v3_abi_vtable' object to the vtable's "address point" | |
191 | (i.e., where objects' virtual table pointers point). */ | |
192 | static int | |
ad4820ab | 193 | vtable_address_point_offset (struct gdbarch *gdbarch) |
7ed49443 | 194 | { |
9a3c8263 SM |
195 | struct type *vtable_type |
196 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
7ed49443 JB |
197 | |
198 | return (TYPE_FIELD_BITPOS (vtable_type, vtable_field_virtual_functions) | |
dda83cd7 | 199 | / TARGET_CHAR_BIT); |
7ed49443 JB |
200 | } |
201 | ||
202 | ||
d48cc9dd DJ |
203 | /* Determine whether structure TYPE is a dynamic class. Cache the |
204 | result. */ | |
205 | ||
206 | static int | |
207 | gnuv3_dynamic_class (struct type *type) | |
208 | { | |
209 | int fieldnum, fieldelem; | |
210 | ||
f168693b | 211 | type = check_typedef (type); |
78134374 SM |
212 | gdb_assert (type->code () == TYPE_CODE_STRUCT |
213 | || type->code () == TYPE_CODE_UNION); | |
5f4ce105 | 214 | |
78134374 | 215 | if (type->code () == TYPE_CODE_UNION) |
5f4ce105 DE |
216 | return 0; |
217 | ||
d48cc9dd DJ |
218 | if (TYPE_CPLUS_DYNAMIC (type)) |
219 | return TYPE_CPLUS_DYNAMIC (type) == 1; | |
220 | ||
221 | ALLOCATE_CPLUS_STRUCT_TYPE (type); | |
222 | ||
223 | for (fieldnum = 0; fieldnum < TYPE_N_BASECLASSES (type); fieldnum++) | |
224 | if (BASETYPE_VIA_VIRTUAL (type, fieldnum) | |
940da03e | 225 | || gnuv3_dynamic_class (type->field (fieldnum).type ())) |
d48cc9dd DJ |
226 | { |
227 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
228 | return 1; | |
229 | } | |
230 | ||
231 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) | |
232 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
233 | fieldelem++) | |
234 | { | |
235 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
236 | ||
237 | if (TYPE_FN_FIELD_VIRTUAL_P (f, fieldelem)) | |
238 | { | |
239 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
240 | return 1; | |
241 | } | |
242 | } | |
243 | ||
244 | TYPE_CPLUS_DYNAMIC (type) = -1; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | /* Find the vtable for a value of CONTAINER_TYPE located at | |
249 | CONTAINER_ADDR. Return a value of the correct vtable type for this | |
250 | architecture, or NULL if CONTAINER does not have a vtable. */ | |
251 | ||
252 | static struct value * | |
253 | gnuv3_get_vtable (struct gdbarch *gdbarch, | |
254 | struct type *container_type, CORE_ADDR container_addr) | |
255 | { | |
9a3c8263 SM |
256 | struct type *vtable_type |
257 | = (struct type *) gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
d48cc9dd DJ |
258 | struct type *vtable_pointer_type; |
259 | struct value *vtable_pointer; | |
260 | CORE_ADDR vtable_address; | |
261 | ||
f168693b | 262 | container_type = check_typedef (container_type); |
78134374 | 263 | gdb_assert (container_type->code () == TYPE_CODE_STRUCT); |
5f4ce105 | 264 | |
d48cc9dd DJ |
265 | /* If this type does not have a virtual table, don't read the first |
266 | field. */ | |
5f4ce105 | 267 | if (!gnuv3_dynamic_class (container_type)) |
d48cc9dd DJ |
268 | return NULL; |
269 | ||
270 | /* We do not consult the debug information to find the virtual table. | |
271 | The ABI specifies that it is always at offset zero in any class, | |
272 | and debug information may not represent it. | |
273 | ||
274 | We avoid using value_contents on principle, because the object might | |
275 | be large. */ | |
276 | ||
277 | /* Find the type "pointer to virtual table". */ | |
278 | vtable_pointer_type = lookup_pointer_type (vtable_type); | |
279 | ||
280 | /* Load it from the start of the class. */ | |
281 | vtable_pointer = value_at (vtable_pointer_type, container_addr); | |
282 | vtable_address = value_as_address (vtable_pointer); | |
283 | ||
284 | /* Correct it to point at the start of the virtual table, rather | |
285 | than the address point. */ | |
286 | return value_at_lazy (vtable_type, | |
0963b4bd MS |
287 | vtable_address |
288 | - vtable_address_point_offset (gdbarch)); | |
d48cc9dd DJ |
289 | } |
290 | ||
291 | ||
7ed49443 JB |
292 | static struct type * |
293 | gnuv3_rtti_type (struct value *value, | |
dda83cd7 | 294 | int *full_p, LONGEST *top_p, int *using_enc_p) |
7ed49443 | 295 | { |
ad4820ab | 296 | struct gdbarch *gdbarch; |
df407dfe | 297 | struct type *values_type = check_typedef (value_type (value)); |
7ed49443 JB |
298 | struct value *vtable; |
299 | struct minimal_symbol *vtable_symbol; | |
300 | const char *vtable_symbol_name; | |
301 | const char *class_name; | |
7ed49443 JB |
302 | struct type *run_time_type; |
303 | LONGEST offset_to_top; | |
e6a959d6 | 304 | const char *atsign; |
7ed49443 | 305 | |
e95a97d4 | 306 | /* We only have RTTI for dynamic class objects. */ |
78134374 | 307 | if (values_type->code () != TYPE_CODE_STRUCT |
e95a97d4 | 308 | || !gnuv3_dynamic_class (values_type)) |
7ed49443 JB |
309 | return NULL; |
310 | ||
ad4820ab | 311 | /* Determine architecture. */ |
8ee511af | 312 | gdbarch = values_type->arch (); |
7ed49443 | 313 | |
21cfb3b6 DJ |
314 | if (using_enc_p) |
315 | *using_enc_p = 0; | |
316 | ||
5f4ce105 | 317 | vtable = gnuv3_get_vtable (gdbarch, values_type, |
d48cc9dd DJ |
318 | value_as_address (value_addr (value))); |
319 | if (vtable == NULL) | |
320 | return NULL; | |
321 | ||
7ed49443 JB |
322 | /* Find the linker symbol for this vtable. */ |
323 | vtable_symbol | |
42ae5230 | 324 | = lookup_minimal_symbol_by_pc (value_address (vtable) |
dda83cd7 | 325 | + value_embedded_offset (vtable)).minsym; |
7ed49443 JB |
326 | if (! vtable_symbol) |
327 | return NULL; | |
328 | ||
329 | /* The symbol's demangled name should be something like "vtable for | |
330 | CLASS", where CLASS is the name of the run-time type of VALUE. | |
331 | If we didn't like this approach, we could instead look in the | |
332 | type_info object itself to get the class name. But this way | |
333 | should work just as well, and doesn't read target memory. */ | |
c9d95fa3 | 334 | vtable_symbol_name = vtable_symbol->demangled_name (); |
98081e55 | 335 | if (vtable_symbol_name == NULL |
61012eef | 336 | || !startswith (vtable_symbol_name, "vtable for ")) |
f773fdbb | 337 | { |
8a3fe4f8 | 338 | warning (_("can't find linker symbol for virtual table for `%s' value"), |
0a07729b | 339 | TYPE_SAFE_NAME (values_type)); |
f773fdbb | 340 | if (vtable_symbol_name) |
8a3fe4f8 | 341 | warning (_(" found `%s' instead"), vtable_symbol_name); |
f773fdbb JM |
342 | return NULL; |
343 | } | |
7ed49443 JB |
344 | class_name = vtable_symbol_name + 11; |
345 | ||
8de20a37 TT |
346 | /* Strip off @plt and version suffixes. */ |
347 | atsign = strchr (class_name, '@'); | |
348 | if (atsign != NULL) | |
349 | { | |
350 | char *copy; | |
351 | ||
224c3ddb | 352 | copy = (char *) alloca (atsign - class_name + 1); |
8de20a37 TT |
353 | memcpy (copy, class_name, atsign - class_name); |
354 | copy[atsign - class_name] = '\0'; | |
355 | class_name = copy; | |
356 | } | |
357 | ||
7ed49443 | 358 | /* Try to look up the class name as a type name. */ |
0963b4bd | 359 | /* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */ |
362ff856 MC |
360 | run_time_type = cp_lookup_rtti_type (class_name, NULL); |
361 | if (run_time_type == NULL) | |
362 | return NULL; | |
7ed49443 JB |
363 | |
364 | /* Get the offset from VALUE to the top of the complete object. | |
365 | NOTE: this is the reverse of the meaning of *TOP_P. */ | |
366 | offset_to_top | |
367 | = value_as_long (value_field (vtable, vtable_field_offset_to_top)); | |
368 | ||
369 | if (full_p) | |
13c3b5f5 | 370 | *full_p = (- offset_to_top == value_embedded_offset (value) |
dda83cd7 SM |
371 | && (TYPE_LENGTH (value_enclosing_type (value)) |
372 | >= TYPE_LENGTH (run_time_type))); | |
7ed49443 JB |
373 | if (top_p) |
374 | *top_p = - offset_to_top; | |
7ed49443 JB |
375 | return run_time_type; |
376 | } | |
377 | ||
0d5de010 DJ |
378 | /* Return a function pointer for CONTAINER's VTABLE_INDEX'th virtual |
379 | function, of type FNTYPE. */ | |
7ed49443 | 380 | |
0d5de010 | 381 | static struct value * |
ad4820ab UW |
382 | gnuv3_get_virtual_fn (struct gdbarch *gdbarch, struct value *container, |
383 | struct type *fntype, int vtable_index) | |
0d5de010 | 384 | { |
d48cc9dd DJ |
385 | struct value *vtable, *vfn; |
386 | ||
387 | /* Every class with virtual functions must have a vtable. */ | |
388 | vtable = gnuv3_get_vtable (gdbarch, value_type (container), | |
389 | value_as_address (value_addr (container))); | |
390 | gdb_assert (vtable != NULL); | |
7ed49443 JB |
391 | |
392 | /* Fetch the appropriate function pointer from the vtable. */ | |
393 | vfn = value_subscript (value_field (vtable, vtable_field_virtual_functions), | |
dda83cd7 | 394 | vtable_index); |
7ed49443 | 395 | |
0d5de010 DJ |
396 | /* If this architecture uses function descriptors directly in the vtable, |
397 | then the address of the vtable entry is actually a "function pointer" | |
398 | (i.e. points to the descriptor). We don't need to scale the index | |
85102364 | 399 | by the size of a function descriptor; GCC does that before outputting |
0d5de010 | 400 | debug information. */ |
ad4820ab | 401 | if (gdbarch_vtable_function_descriptors (gdbarch)) |
0d5de010 | 402 | vfn = value_addr (vfn); |
7ed49443 | 403 | |
0d5de010 DJ |
404 | /* Cast the function pointer to the appropriate type. */ |
405 | vfn = value_cast (lookup_pointer_type (fntype), vfn); | |
76b79d6e | 406 | |
7ed49443 JB |
407 | return vfn; |
408 | } | |
409 | ||
0d5de010 DJ |
410 | /* GNU v3 implementation of value_virtual_fn_field. See cp-abi.h |
411 | for a description of the arguments. */ | |
412 | ||
413 | static struct value * | |
414 | gnuv3_virtual_fn_field (struct value **value_p, | |
dda83cd7 | 415 | struct fn_field *f, int j, |
0d5de010 DJ |
416 | struct type *vfn_base, int offset) |
417 | { | |
418 | struct type *values_type = check_typedef (value_type (*value_p)); | |
ad4820ab | 419 | struct gdbarch *gdbarch; |
0d5de010 DJ |
420 | |
421 | /* Some simple sanity checks. */ | |
78134374 | 422 | if (values_type->code () != TYPE_CODE_STRUCT) |
0d5de010 DJ |
423 | error (_("Only classes can have virtual functions.")); |
424 | ||
ad4820ab | 425 | /* Determine architecture. */ |
8ee511af | 426 | gdbarch = values_type->arch (); |
ad4820ab | 427 | |
0d5de010 DJ |
428 | /* Cast our value to the base class which defines this virtual |
429 | function. This takes care of any necessary `this' | |
430 | adjustments. */ | |
431 | if (vfn_base != values_type) | |
432 | *value_p = value_cast (vfn_base, *value_p); | |
433 | ||
ad4820ab | 434 | return gnuv3_get_virtual_fn (gdbarch, *value_p, TYPE_FN_FIELD_TYPE (f, j), |
0d5de010 DJ |
435 | TYPE_FN_FIELD_VOFFSET (f, j)); |
436 | } | |
437 | ||
1514d34e DJ |
438 | /* Compute the offset of the baseclass which is |
439 | the INDEXth baseclass of class TYPE, | |
440 | for value at VALADDR (in host) at ADDRESS (in target). | |
441 | The result is the offset of the baseclass value relative | |
442 | to (the address of)(ARG) + OFFSET. | |
443 | ||
0963b4bd MS |
444 | -1 is returned on error. */ |
445 | ||
b9362cc7 | 446 | static int |
8af8e3bc | 447 | gnuv3_baseclass_offset (struct type *type, int index, |
6b850546 | 448 | const bfd_byte *valaddr, LONGEST embedded_offset, |
8af8e3bc | 449 | CORE_ADDR address, const struct value *val) |
1514d34e | 450 | { |
ad4820ab | 451 | struct gdbarch *gdbarch; |
ad4820ab | 452 | struct type *ptr_type; |
79d5b63a | 453 | struct value *vtable; |
2497b498 | 454 | struct value *vbase_array; |
1514d34e | 455 | long int cur_base_offset, base_offset; |
1514d34e | 456 | |
ad4820ab | 457 | /* Determine architecture. */ |
8ee511af | 458 | gdbarch = type->arch (); |
ad4820ab UW |
459 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
460 | ||
1514d34e | 461 | /* If it isn't a virtual base, this is easy. The offset is in the |
9c37b5ae TT |
462 | type definition. */ |
463 | if (!BASETYPE_VIA_VIRTUAL (type, index)) | |
1514d34e DJ |
464 | return TYPE_BASECLASS_BITPOS (type, index) / 8; |
465 | ||
7d79de9a TT |
466 | /* If we have a DWARF expression for the offset, evaluate it. */ |
467 | if (TYPE_FIELD_LOC_KIND (type, index) == FIELD_LOC_KIND_DWARF_BLOCK) | |
468 | { | |
469 | struct dwarf2_property_baton baton; | |
470 | baton.property_type | |
940da03e | 471 | = lookup_pointer_type (type->field (index).type ()); |
7d79de9a TT |
472 | baton.locexpr = *TYPE_FIELD_DWARF_BLOCK (type, index); |
473 | ||
474 | struct dynamic_prop prop; | |
8c2e4e06 | 475 | prop.set_locexpr (&baton); |
7d79de9a TT |
476 | |
477 | struct property_addr_info addr_stack; | |
478 | addr_stack.type = type; | |
479 | /* Note that we don't set "valaddr" here. Doing so causes | |
480 | regressions. FIXME. */ | |
481 | addr_stack.addr = address + embedded_offset; | |
482 | addr_stack.next = nullptr; | |
483 | ||
484 | CORE_ADDR result; | |
485 | if (dwarf2_evaluate_property (&prop, nullptr, &addr_stack, &result, | |
486 | true)) | |
487 | return (int) (result - addr_stack.addr); | |
488 | } | |
489 | ||
1514d34e DJ |
490 | /* To access a virtual base, we need to use the vbase offset stored in |
491 | our vtable. Recent GCC versions provide this information. If it isn't | |
492 | available, we could get what we needed from RTTI, or from drawing the | |
493 | complete inheritance graph based on the debug info. Neither is | |
494 | worthwhile. */ | |
495 | cur_base_offset = TYPE_BASECLASS_BITPOS (type, index) / 8; | |
ad4820ab | 496 | if (cur_base_offset >= - vtable_address_point_offset (gdbarch)) |
8a3fe4f8 | 497 | error (_("Expected a negative vbase offset (old compiler?)")); |
1514d34e | 498 | |
ad4820ab UW |
499 | cur_base_offset = cur_base_offset + vtable_address_point_offset (gdbarch); |
500 | if ((- cur_base_offset) % TYPE_LENGTH (ptr_type) != 0) | |
8a3fe4f8 | 501 | error (_("Misaligned vbase offset.")); |
ad4820ab | 502 | cur_base_offset = cur_base_offset / ((int) TYPE_LENGTH (ptr_type)); |
1514d34e | 503 | |
8af8e3bc | 504 | vtable = gnuv3_get_vtable (gdbarch, type, address + embedded_offset); |
d48cc9dd | 505 | gdb_assert (vtable != NULL); |
1514d34e | 506 | vbase_array = value_field (vtable, vtable_field_vcall_and_vbase_offsets); |
2497b498 | 507 | base_offset = value_as_long (value_subscript (vbase_array, cur_base_offset)); |
1514d34e DJ |
508 | return base_offset; |
509 | } | |
7ed49443 | 510 | |
0d5de010 DJ |
511 | /* Locate a virtual method in DOMAIN or its non-virtual base classes |
512 | which has virtual table index VOFFSET. The method has an associated | |
513 | "this" adjustment of ADJUSTMENT bytes. */ | |
514 | ||
2c0b251b | 515 | static const char * |
0d5de010 DJ |
516 | gnuv3_find_method_in (struct type *domain, CORE_ADDR voffset, |
517 | LONGEST adjustment) | |
518 | { | |
519 | int i; | |
0d5de010 DJ |
520 | |
521 | /* Search this class first. */ | |
0d5de010 DJ |
522 | if (adjustment == 0) |
523 | { | |
524 | int len; | |
525 | ||
526 | len = TYPE_NFN_FIELDS (domain); | |
527 | for (i = 0; i < len; i++) | |
528 | { | |
529 | int len2, j; | |
530 | struct fn_field *f; | |
531 | ||
532 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
533 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
534 | ||
535 | check_stub_method_group (domain, i); | |
536 | for (j = 0; j < len2; j++) | |
537 | if (TYPE_FN_FIELD_VOFFSET (f, j) == voffset) | |
538 | return TYPE_FN_FIELD_PHYSNAME (f, j); | |
539 | } | |
540 | } | |
541 | ||
542 | /* Next search non-virtual bases. If it's in a virtual base, | |
543 | we're out of luck. */ | |
544 | for (i = 0; i < TYPE_N_BASECLASSES (domain); i++) | |
545 | { | |
546 | int pos; | |
547 | struct type *basetype; | |
548 | ||
549 | if (BASETYPE_VIA_VIRTUAL (domain, i)) | |
550 | continue; | |
551 | ||
552 | pos = TYPE_BASECLASS_BITPOS (domain, i) / 8; | |
940da03e | 553 | basetype = domain->field (i).type (); |
0d5de010 DJ |
554 | /* Recurse with a modified adjustment. We don't need to adjust |
555 | voffset. */ | |
556 | if (adjustment >= pos && adjustment < pos + TYPE_LENGTH (basetype)) | |
557 | return gnuv3_find_method_in (basetype, voffset, adjustment - pos); | |
558 | } | |
559 | ||
560 | return NULL; | |
561 | } | |
562 | ||
fead6908 UW |
563 | /* Decode GNU v3 method pointer. */ |
564 | ||
565 | static int | |
ad4820ab UW |
566 | gnuv3_decode_method_ptr (struct gdbarch *gdbarch, |
567 | const gdb_byte *contents, | |
fead6908 UW |
568 | CORE_ADDR *value_p, |
569 | LONGEST *adjustment_p) | |
570 | { | |
ad4820ab | 571 | struct type *funcptr_type = builtin_type (gdbarch)->builtin_func_ptr; |
ed09d7da | 572 | struct type *offset_type = vtable_ptrdiff_type (gdbarch); |
e17a4113 | 573 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
fead6908 UW |
574 | CORE_ADDR ptr_value; |
575 | LONGEST voffset, adjustment; | |
576 | int vbit; | |
577 | ||
578 | /* Extract the pointer to member. The first element is either a pointer | |
579 | or a vtable offset. For pointers, we need to use extract_typed_address | |
580 | to allow the back-end to convert the pointer to a GDB address -- but | |
581 | vtable offsets we must handle as integers. At this point, we do not | |
582 | yet know which case we have, so we extract the value under both | |
583 | interpretations and choose the right one later on. */ | |
584 | ptr_value = extract_typed_address (contents, funcptr_type); | |
e17a4113 UW |
585 | voffset = extract_signed_integer (contents, |
586 | TYPE_LENGTH (funcptr_type), byte_order); | |
fead6908 | 587 | contents += TYPE_LENGTH (funcptr_type); |
e17a4113 UW |
588 | adjustment = extract_signed_integer (contents, |
589 | TYPE_LENGTH (offset_type), byte_order); | |
fead6908 | 590 | |
ad4820ab | 591 | if (!gdbarch_vbit_in_delta (gdbarch)) |
fead6908 UW |
592 | { |
593 | vbit = voffset & 1; | |
594 | voffset = voffset ^ vbit; | |
595 | } | |
596 | else | |
597 | { | |
598 | vbit = adjustment & 1; | |
599 | adjustment = adjustment >> 1; | |
600 | } | |
601 | ||
602 | *value_p = vbit? voffset : ptr_value; | |
603 | *adjustment_p = adjustment; | |
604 | return vbit; | |
605 | } | |
606 | ||
0d5de010 DJ |
607 | /* GNU v3 implementation of cplus_print_method_ptr. */ |
608 | ||
609 | static void | |
610 | gnuv3_print_method_ptr (const gdb_byte *contents, | |
611 | struct type *type, | |
612 | struct ui_file *stream) | |
613 | { | |
09e2d7c7 | 614 | struct type *self_type = TYPE_SELF_TYPE (type); |
8ee511af | 615 | struct gdbarch *gdbarch = self_type->arch (); |
0d5de010 DJ |
616 | CORE_ADDR ptr_value; |
617 | LONGEST adjustment; | |
0d5de010 DJ |
618 | int vbit; |
619 | ||
0d5de010 | 620 | /* Extract the pointer to member. */ |
ad4820ab | 621 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
622 | |
623 | /* Check for NULL. */ | |
624 | if (ptr_value == 0 && vbit == 0) | |
625 | { | |
626 | fprintf_filtered (stream, "NULL"); | |
627 | return; | |
628 | } | |
629 | ||
630 | /* Search for a virtual method. */ | |
631 | if (vbit) | |
632 | { | |
633 | CORE_ADDR voffset; | |
634 | const char *physname; | |
635 | ||
636 | /* It's a virtual table offset, maybe in this class. Search | |
637 | for a field with the correct vtable offset. First convert it | |
638 | to an index, as used in TYPE_FN_FIELD_VOFFSET. */ | |
ed09d7da | 639 | voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch)); |
0d5de010 | 640 | |
09e2d7c7 | 641 | physname = gnuv3_find_method_in (self_type, voffset, adjustment); |
0d5de010 DJ |
642 | |
643 | /* If we found a method, print that. We don't bother to disambiguate | |
644 | possible paths to the method based on the adjustment. */ | |
645 | if (physname) | |
646 | { | |
8de20a37 TT |
647 | char *demangled_name = gdb_demangle (physname, |
648 | DMGL_ANSI | DMGL_PARAMS); | |
d8734c88 | 649 | |
94af9270 KS |
650 | fprintf_filtered (stream, "&virtual "); |
651 | if (demangled_name == NULL) | |
652 | fputs_filtered (physname, stream); | |
653 | else | |
0d5de010 | 654 | { |
0d5de010 DJ |
655 | fputs_filtered (demangled_name, stream); |
656 | xfree (demangled_name); | |
0d5de010 | 657 | } |
94af9270 | 658 | return; |
0d5de010 DJ |
659 | } |
660 | } | |
94af9270 KS |
661 | else if (ptr_value != 0) |
662 | { | |
663 | /* Found a non-virtual function: print out the type. */ | |
664 | fputs_filtered ("(", stream); | |
79d43c61 | 665 | c_print_type (type, "", stream, -1, 0, &type_print_raw_options); |
94af9270 KS |
666 | fputs_filtered (") ", stream); |
667 | } | |
0d5de010 DJ |
668 | |
669 | /* We didn't find it; print the raw data. */ | |
670 | if (vbit) | |
671 | { | |
672 | fprintf_filtered (stream, "&virtual table offset "); | |
673 | print_longest (stream, 'd', 1, ptr_value); | |
674 | } | |
675 | else | |
edf0c1b7 TT |
676 | { |
677 | struct value_print_options opts; | |
678 | ||
679 | get_user_print_options (&opts); | |
680 | print_address_demangle (&opts, gdbarch, ptr_value, stream, demangle); | |
681 | } | |
0d5de010 DJ |
682 | |
683 | if (adjustment) | |
684 | { | |
685 | fprintf_filtered (stream, ", this adjustment "); | |
686 | print_longest (stream, 'd', 1, adjustment); | |
687 | } | |
688 | } | |
689 | ||
690 | /* GNU v3 implementation of cplus_method_ptr_size. */ | |
691 | ||
692 | static int | |
ad4820ab | 693 | gnuv3_method_ptr_size (struct type *type) |
0d5de010 | 694 | { |
8ee511af | 695 | return 2 * TYPE_LENGTH (builtin_type (type->arch ())->builtin_data_ptr); |
0d5de010 DJ |
696 | } |
697 | ||
698 | /* GNU v3 implementation of cplus_make_method_ptr. */ | |
699 | ||
700 | static void | |
ad4820ab UW |
701 | gnuv3_make_method_ptr (struct type *type, gdb_byte *contents, |
702 | CORE_ADDR value, int is_virtual) | |
0d5de010 | 703 | { |
8ee511af | 704 | struct gdbarch *gdbarch = type->arch (); |
ad4820ab | 705 | int size = TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr); |
34877895 | 706 | enum bfd_endian byte_order = type_byte_order (type); |
0d5de010 DJ |
707 | |
708 | /* FIXME drow/2006-12-24: The adjustment of "this" is currently | |
709 | always zero, since the method pointer is of the correct type. | |
710 | But if the method pointer came from a base class, this is | |
711 | incorrect - it should be the offset to the base. The best | |
712 | fix might be to create the pointer to member pointing at the | |
713 | base class and cast it to the derived class, but that requires | |
714 | support for adjusting pointers to members when casting them - | |
715 | not currently supported by GDB. */ | |
716 | ||
ad4820ab | 717 | if (!gdbarch_vbit_in_delta (gdbarch)) |
0d5de010 | 718 | { |
e17a4113 UW |
719 | store_unsigned_integer (contents, size, byte_order, value | is_virtual); |
720 | store_unsigned_integer (contents + size, size, byte_order, 0); | |
0d5de010 DJ |
721 | } |
722 | else | |
723 | { | |
e17a4113 UW |
724 | store_unsigned_integer (contents, size, byte_order, value); |
725 | store_unsigned_integer (contents + size, size, byte_order, is_virtual); | |
0d5de010 DJ |
726 | } |
727 | } | |
728 | ||
729 | /* GNU v3 implementation of cplus_method_ptr_to_value. */ | |
730 | ||
731 | static struct value * | |
732 | gnuv3_method_ptr_to_value (struct value **this_p, struct value *method_ptr) | |
733 | { | |
ad4820ab | 734 | struct gdbarch *gdbarch; |
0d5de010 DJ |
735 | const gdb_byte *contents = value_contents (method_ptr); |
736 | CORE_ADDR ptr_value; | |
09e2d7c7 | 737 | struct type *self_type, *final_type, *method_type; |
0d5de010 | 738 | LONGEST adjustment; |
0d5de010 DJ |
739 | int vbit; |
740 | ||
09e2d7c7 DE |
741 | self_type = TYPE_SELF_TYPE (check_typedef (value_type (method_ptr))); |
742 | final_type = lookup_pointer_type (self_type); | |
0d5de010 DJ |
743 | |
744 | method_type = TYPE_TARGET_TYPE (check_typedef (value_type (method_ptr))); | |
745 | ||
fead6908 | 746 | /* Extract the pointer to member. */ |
8ee511af | 747 | gdbarch = self_type->arch (); |
ad4820ab | 748 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
749 | |
750 | /* First convert THIS to match the containing type of the pointer to | |
751 | member. This cast may adjust the value of THIS. */ | |
752 | *this_p = value_cast (final_type, *this_p); | |
753 | ||
754 | /* Then apply whatever adjustment is necessary. This creates a somewhat | |
755 | strange pointer: it claims to have type FINAL_TYPE, but in fact it | |
756 | might not be a valid FINAL_TYPE. For instance, it might be a | |
757 | base class of FINAL_TYPE. And if it's not the primary base class, | |
758 | then printing it out as a FINAL_TYPE object would produce some pretty | |
759 | garbage. | |
760 | ||
761 | But we don't really know the type of the first argument in | |
762 | METHOD_TYPE either, which is why this happens. We can't | |
763 | dereference this later as a FINAL_TYPE, but once we arrive in the | |
764 | called method we'll have debugging information for the type of | |
765 | "this" - and that'll match the value we produce here. | |
766 | ||
767 | You can provoke this case by casting a Base::* to a Derived::*, for | |
768 | instance. */ | |
ad4820ab | 769 | *this_p = value_cast (builtin_type (gdbarch)->builtin_data_ptr, *this_p); |
2497b498 | 770 | *this_p = value_ptradd (*this_p, adjustment); |
0d5de010 DJ |
771 | *this_p = value_cast (final_type, *this_p); |
772 | ||
773 | if (vbit) | |
774 | { | |
ad4820ab | 775 | LONGEST voffset; |
d8734c88 | 776 | |
ed09d7da | 777 | voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch)); |
ad4820ab UW |
778 | return gnuv3_get_virtual_fn (gdbarch, value_ind (*this_p), |
779 | method_type, voffset); | |
0d5de010 DJ |
780 | } |
781 | else | |
782 | return value_from_pointer (lookup_pointer_type (method_type), ptr_value); | |
783 | } | |
784 | ||
c4aeac85 TT |
785 | /* Objects of this type are stored in a hash table and a vector when |
786 | printing the vtables for a class. */ | |
787 | ||
788 | struct value_and_voffset | |
789 | { | |
790 | /* The value representing the object. */ | |
791 | struct value *value; | |
792 | ||
793 | /* The maximum vtable offset we've found for any object at this | |
794 | offset in the outermost object. */ | |
795 | int max_voffset; | |
796 | }; | |
797 | ||
c4aeac85 TT |
798 | /* Hash function for value_and_voffset. */ |
799 | ||
800 | static hashval_t | |
801 | hash_value_and_voffset (const void *p) | |
802 | { | |
9a3c8263 | 803 | const struct value_and_voffset *o = (const struct value_and_voffset *) p; |
c4aeac85 TT |
804 | |
805 | return value_address (o->value) + value_embedded_offset (o->value); | |
806 | } | |
807 | ||
808 | /* Equality function for value_and_voffset. */ | |
809 | ||
810 | static int | |
811 | eq_value_and_voffset (const void *a, const void *b) | |
812 | { | |
9a3c8263 SM |
813 | const struct value_and_voffset *ova = (const struct value_and_voffset *) a; |
814 | const struct value_and_voffset *ovb = (const struct value_and_voffset *) b; | |
c4aeac85 TT |
815 | |
816 | return (value_address (ova->value) + value_embedded_offset (ova->value) | |
817 | == value_address (ovb->value) + value_embedded_offset (ovb->value)); | |
818 | } | |
819 | ||
59d3651b | 820 | /* Comparison function for value_and_voffset. */ |
c4aeac85 | 821 | |
59d3651b TT |
822 | static bool |
823 | compare_value_and_voffset (const struct value_and_voffset *va, | |
824 | const struct value_and_voffset *vb) | |
c4aeac85 | 825 | { |
59d3651b TT |
826 | CORE_ADDR addra = (value_address (va->value) |
827 | + value_embedded_offset (va->value)); | |
828 | CORE_ADDR addrb = (value_address (vb->value) | |
829 | + value_embedded_offset (vb->value)); | |
830 | ||
831 | return addra < addrb; | |
c4aeac85 TT |
832 | } |
833 | ||
834 | /* A helper function used when printing vtables. This determines the | |
835 | key (most derived) sub-object at each address and also computes the | |
836 | maximum vtable offset seen for the corresponding vtable. Updates | |
837 | OFFSET_HASH and OFFSET_VEC with a new value_and_voffset object, if | |
838 | needed. VALUE is the object to examine. */ | |
839 | ||
840 | static void | |
841 | compute_vtable_size (htab_t offset_hash, | |
59d3651b | 842 | std::vector<value_and_voffset *> *offset_vec, |
c4aeac85 TT |
843 | struct value *value) |
844 | { | |
845 | int i; | |
846 | struct type *type = check_typedef (value_type (value)); | |
847 | void **slot; | |
848 | struct value_and_voffset search_vo, *current_vo; | |
c4aeac85 | 849 | |
78134374 | 850 | gdb_assert (type->code () == TYPE_CODE_STRUCT); |
5f4ce105 | 851 | |
c4aeac85 TT |
852 | /* If the object is not dynamic, then we are done; as it cannot have |
853 | dynamic base types either. */ | |
854 | if (!gnuv3_dynamic_class (type)) | |
855 | return; | |
856 | ||
857 | /* Update the hash and the vec, if needed. */ | |
858 | search_vo.value = value; | |
859 | slot = htab_find_slot (offset_hash, &search_vo, INSERT); | |
860 | if (*slot) | |
9a3c8263 | 861 | current_vo = (struct value_and_voffset *) *slot; |
c4aeac85 TT |
862 | else |
863 | { | |
864 | current_vo = XNEW (struct value_and_voffset); | |
865 | current_vo->value = value; | |
866 | current_vo->max_voffset = -1; | |
867 | *slot = current_vo; | |
59d3651b | 868 | offset_vec->push_back (current_vo); |
c4aeac85 TT |
869 | } |
870 | ||
871 | /* Update the value_and_voffset object with the highest vtable | |
872 | offset from this class. */ | |
873 | for (i = 0; i < TYPE_NFN_FIELDS (type); ++i) | |
874 | { | |
875 | int j; | |
876 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, i); | |
877 | ||
878 | for (j = 0; j < TYPE_FN_FIELDLIST_LENGTH (type, i); ++j) | |
879 | { | |
880 | if (TYPE_FN_FIELD_VIRTUAL_P (fn, j)) | |
881 | { | |
882 | int voffset = TYPE_FN_FIELD_VOFFSET (fn, j); | |
883 | ||
884 | if (voffset > current_vo->max_voffset) | |
885 | current_vo->max_voffset = voffset; | |
886 | } | |
887 | } | |
888 | } | |
889 | ||
890 | /* Recurse into base classes. */ | |
891 | for (i = 0; i < TYPE_N_BASECLASSES (type); ++i) | |
892 | compute_vtable_size (offset_hash, offset_vec, value_field (value, i)); | |
893 | } | |
894 | ||
895 | /* Helper for gnuv3_print_vtable that prints a single vtable. */ | |
896 | ||
897 | static void | |
898 | print_one_vtable (struct gdbarch *gdbarch, struct value *value, | |
899 | int max_voffset, | |
900 | struct value_print_options *opts) | |
901 | { | |
902 | int i; | |
903 | struct type *type = check_typedef (value_type (value)); | |
904 | struct value *vtable; | |
905 | CORE_ADDR vt_addr; | |
906 | ||
907 | vtable = gnuv3_get_vtable (gdbarch, type, | |
908 | value_address (value) | |
909 | + value_embedded_offset (value)); | |
910 | vt_addr = value_address (value_field (vtable, | |
911 | vtable_field_virtual_functions)); | |
912 | ||
913 | printf_filtered (_("vtable for '%s' @ %s (subobject @ %s):\n"), | |
914 | TYPE_SAFE_NAME (type), | |
915 | paddress (gdbarch, vt_addr), | |
916 | paddress (gdbarch, (value_address (value) | |
917 | + value_embedded_offset (value)))); | |
918 | ||
919 | for (i = 0; i <= max_voffset; ++i) | |
920 | { | |
cafe75b0 JK |
921 | /* Initialize it just to avoid a GCC false warning. */ |
922 | CORE_ADDR addr = 0; | |
492d29ea | 923 | int got_error = 0; |
c4aeac85 | 924 | struct value *vfn; |
c4aeac85 TT |
925 | |
926 | printf_filtered ("[%d]: ", i); | |
927 | ||
928 | vfn = value_subscript (value_field (vtable, | |
929 | vtable_field_virtual_functions), | |
930 | i); | |
931 | ||
932 | if (gdbarch_vtable_function_descriptors (gdbarch)) | |
933 | vfn = value_addr (vfn); | |
934 | ||
a70b8144 | 935 | try |
c4aeac85 TT |
936 | { |
937 | addr = value_as_address (vfn); | |
938 | } | |
230d2906 | 939 | catch (const gdb_exception_error &ex) |
492d29ea | 940 | { |
7f6aba03 TT |
941 | fprintf_styled (gdb_stdout, metadata_style.style (), |
942 | _("<error: %s>"), ex.what ()); | |
492d29ea PA |
943 | got_error = 1; |
944 | } | |
492d29ea PA |
945 | |
946 | if (!got_error) | |
edf0c1b7 | 947 | print_function_pointer_address (opts, gdbarch, addr, gdb_stdout); |
c4aeac85 TT |
948 | printf_filtered ("\n"); |
949 | } | |
950 | } | |
951 | ||
952 | /* Implementation of the print_vtable method. */ | |
953 | ||
954 | static void | |
955 | gnuv3_print_vtable (struct value *value) | |
956 | { | |
957 | struct gdbarch *gdbarch; | |
958 | struct type *type; | |
959 | struct value *vtable; | |
960 | struct value_print_options opts; | |
59d3651b | 961 | int count; |
c4aeac85 TT |
962 | |
963 | value = coerce_ref (value); | |
964 | type = check_typedef (value_type (value)); | |
78134374 | 965 | if (type->code () == TYPE_CODE_PTR) |
c4aeac85 TT |
966 | { |
967 | value = value_ind (value); | |
968 | type = check_typedef (value_type (value)); | |
969 | } | |
970 | ||
971 | get_user_print_options (&opts); | |
972 | ||
973 | /* Respect 'set print object'. */ | |
974 | if (opts.objectprint) | |
975 | { | |
976 | value = value_full_object (value, NULL, 0, 0, 0); | |
977 | type = check_typedef (value_type (value)); | |
978 | } | |
979 | ||
8ee511af | 980 | gdbarch = type->arch (); |
5f4ce105 DE |
981 | |
982 | vtable = NULL; | |
78134374 | 983 | if (type->code () == TYPE_CODE_STRUCT) |
5f4ce105 DE |
984 | vtable = gnuv3_get_vtable (gdbarch, type, |
985 | value_as_address (value_addr (value))); | |
c4aeac85 TT |
986 | |
987 | if (!vtable) | |
988 | { | |
989 | printf_filtered (_("This object does not have a virtual function table\n")); | |
990 | return; | |
991 | } | |
992 | ||
fc4007c9 TT |
993 | htab_up offset_hash (htab_create_alloc (1, hash_value_and_voffset, |
994 | eq_value_and_voffset, | |
995 | xfree, xcalloc, xfree)); | |
59d3651b | 996 | std::vector<value_and_voffset *> result_vec; |
c4aeac85 | 997 | |
fc4007c9 | 998 | compute_vtable_size (offset_hash.get (), &result_vec, value); |
59d3651b TT |
999 | std::sort (result_vec.begin (), result_vec.end (), |
1000 | compare_value_and_voffset); | |
c4aeac85 TT |
1001 | |
1002 | count = 0; | |
59d3651b | 1003 | for (value_and_voffset *iter : result_vec) |
c4aeac85 TT |
1004 | { |
1005 | if (iter->max_voffset >= 0) | |
1006 | { | |
1007 | if (count > 0) | |
1008 | printf_filtered ("\n"); | |
1009 | print_one_vtable (gdbarch, iter->value, iter->max_voffset, &opts); | |
1010 | ++count; | |
1011 | } | |
1012 | } | |
c4aeac85 TT |
1013 | } |
1014 | ||
6e72ca20 TT |
1015 | /* Return a GDB type representing `struct std::type_info', laid out |
1016 | appropriately for ARCH. | |
1017 | ||
1018 | We use this function as the gdbarch per-architecture data | |
1019 | initialization function. */ | |
1020 | ||
1021 | static void * | |
1022 | build_std_type_info_type (struct gdbarch *arch) | |
1023 | { | |
1024 | struct type *t; | |
1025 | struct field *field_list, *field; | |
1026 | int offset; | |
1027 | struct type *void_ptr_type | |
1028 | = builtin_type (arch)->builtin_data_ptr; | |
1029 | struct type *char_type | |
1030 | = builtin_type (arch)->builtin_char; | |
1031 | struct type *char_ptr_type | |
1032 | = make_pointer_type (make_cv_type (1, 0, char_type, NULL), NULL); | |
1033 | ||
8d749320 | 1034 | field_list = XCNEWVEC (struct field, 2); |
6e72ca20 TT |
1035 | field = &field_list[0]; |
1036 | offset = 0; | |
1037 | ||
1038 | /* The vtable. */ | |
1039 | FIELD_NAME (*field) = "_vptr.type_info"; | |
5d14b6e5 | 1040 | field->set_type (void_ptr_type); |
6e72ca20 | 1041 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 1042 | offset += TYPE_LENGTH (field->type ()); |
6e72ca20 TT |
1043 | field++; |
1044 | ||
1045 | /* The name. */ | |
1046 | FIELD_NAME (*field) = "__name"; | |
5d14b6e5 | 1047 | field->set_type (char_ptr_type); |
6e72ca20 | 1048 | SET_FIELD_BITPOS (*field, offset * TARGET_CHAR_BIT); |
b6cdac4b | 1049 | offset += TYPE_LENGTH (field->type ()); |
6e72ca20 TT |
1050 | field++; |
1051 | ||
1052 | gdb_assert (field == (field_list + 2)); | |
1053 | ||
77b7c781 | 1054 | t = arch_type (arch, TYPE_CODE_STRUCT, offset * TARGET_CHAR_BIT, NULL); |
5e33d5f4 | 1055 | t->set_num_fields (field - field_list); |
3cabb6b0 | 1056 | t->set_fields (field_list); |
d0e39ea2 | 1057 | t->set_name ("gdb_gnu_v3_type_info"); |
6e72ca20 TT |
1058 | INIT_CPLUS_SPECIFIC (t); |
1059 | ||
1060 | return t; | |
1061 | } | |
1062 | ||
1063 | /* Implement the 'get_typeid_type' method. */ | |
1064 | ||
1065 | static struct type * | |
1066 | gnuv3_get_typeid_type (struct gdbarch *gdbarch) | |
1067 | { | |
1068 | struct symbol *typeinfo; | |
1069 | struct type *typeinfo_type; | |
1070 | ||
d12307c1 PMR |
1071 | typeinfo = lookup_symbol ("std::type_info", NULL, STRUCT_DOMAIN, |
1072 | NULL).symbol; | |
6e72ca20 | 1073 | if (typeinfo == NULL) |
9a3c8263 SM |
1074 | typeinfo_type |
1075 | = (struct type *) gdbarch_data (gdbarch, std_type_info_gdbarch_data); | |
6e72ca20 TT |
1076 | else |
1077 | typeinfo_type = SYMBOL_TYPE (typeinfo); | |
1078 | ||
1079 | return typeinfo_type; | |
1080 | } | |
1081 | ||
1082 | /* Implement the 'get_typeid' method. */ | |
1083 | ||
1084 | static struct value * | |
1085 | gnuv3_get_typeid (struct value *value) | |
1086 | { | |
1087 | struct type *typeinfo_type; | |
1088 | struct type *type; | |
1089 | struct gdbarch *gdbarch; | |
6e72ca20 | 1090 | struct value *result; |
596dc4ad TT |
1091 | std::string type_name; |
1092 | gdb::unique_xmalloc_ptr<char> canonical; | |
6e72ca20 TT |
1093 | |
1094 | /* We have to handle values a bit trickily here, to allow this code | |
1095 | to work properly with non_lvalue values that are really just | |
1096 | disguised types. */ | |
1097 | if (value_lval_const (value) == lval_memory) | |
1098 | value = coerce_ref (value); | |
1099 | ||
1100 | type = check_typedef (value_type (value)); | |
1101 | ||
1102 | /* In the non_lvalue case, a reference might have slipped through | |
1103 | here. */ | |
78134374 | 1104 | if (type->code () == TYPE_CODE_REF) |
6e72ca20 TT |
1105 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
1106 | ||
1107 | /* Ignore top-level cv-qualifiers. */ | |
1108 | type = make_cv_type (0, 0, type, NULL); | |
8ee511af | 1109 | gdbarch = type->arch (); |
6e72ca20 | 1110 | |
fe978cb0 | 1111 | type_name = type_to_string (type); |
2f408ecb | 1112 | if (type_name.empty ()) |
6e72ca20 | 1113 | error (_("cannot find typeinfo for unnamed type")); |
6e72ca20 TT |
1114 | |
1115 | /* We need to canonicalize the type name here, because we do lookups | |
1116 | using the demangled name, and so we must match the format it | |
1117 | uses. E.g., GDB tends to use "const char *" as a type name, but | |
1118 | the demangler uses "char const *". */ | |
2f408ecb | 1119 | canonical = cp_canonicalize_string (type_name.c_str ()); |
596dc4ad TT |
1120 | const char *name = (canonical == nullptr |
1121 | ? type_name.c_str () | |
1122 | : canonical.get ()); | |
6e72ca20 TT |
1123 | |
1124 | typeinfo_type = gnuv3_get_typeid_type (gdbarch); | |
1125 | ||
1126 | /* We check for lval_memory because in the "typeid (type-id)" case, | |
1127 | the type is passed via a not_lval value object. */ | |
78134374 | 1128 | if (type->code () == TYPE_CODE_STRUCT |
6e72ca20 TT |
1129 | && value_lval_const (value) == lval_memory |
1130 | && gnuv3_dynamic_class (type)) | |
1131 | { | |
1132 | struct value *vtable, *typeinfo_value; | |
1133 | CORE_ADDR address = value_address (value) + value_embedded_offset (value); | |
1134 | ||
1135 | vtable = gnuv3_get_vtable (gdbarch, type, address); | |
1136 | if (vtable == NULL) | |
2f408ecb | 1137 | error (_("cannot find typeinfo for object of type '%s'"), |
596dc4ad | 1138 | name); |
6e72ca20 TT |
1139 | typeinfo_value = value_field (vtable, vtable_field_type_info); |
1140 | result = value_ind (value_cast (make_pointer_type (typeinfo_type, NULL), | |
1141 | typeinfo_value)); | |
1142 | } | |
1143 | else | |
1144 | { | |
596dc4ad | 1145 | std::string sym_name = std::string ("typeinfo for ") + name; |
2f408ecb PA |
1146 | bound_minimal_symbol minsym |
1147 | = lookup_minimal_symbol (sym_name.c_str (), NULL, NULL); | |
6e72ca20 | 1148 | |
3b7344d5 | 1149 | if (minsym.minsym == NULL) |
596dc4ad | 1150 | error (_("could not find typeinfo symbol for '%s'"), name); |
6e72ca20 | 1151 | |
77e371c0 | 1152 | result = value_at_lazy (typeinfo_type, BMSYMBOL_VALUE_ADDRESS (minsym)); |
6e72ca20 TT |
1153 | } |
1154 | ||
6e72ca20 TT |
1155 | return result; |
1156 | } | |
1157 | ||
cc16e6c9 | 1158 | /* Implement the 'get_typename_from_type_info' method. */ |
72f1fe8a | 1159 | |
2f408ecb | 1160 | static std::string |
72f1fe8a TT |
1161 | gnuv3_get_typename_from_type_info (struct value *type_info_ptr) |
1162 | { | |
8ee511af | 1163 | struct gdbarch *gdbarch = value_type (type_info_ptr)->arch (); |
72f1fe8a TT |
1164 | struct bound_minimal_symbol typeinfo_sym; |
1165 | CORE_ADDR addr; | |
1166 | const char *symname; | |
1167 | const char *class_name; | |
1168 | const char *atsign; | |
1169 | ||
1170 | addr = value_as_address (type_info_ptr); | |
1171 | typeinfo_sym = lookup_minimal_symbol_by_pc (addr); | |
1172 | if (typeinfo_sym.minsym == NULL) | |
1173 | error (_("could not find minimal symbol for typeinfo address %s"), | |
1174 | paddress (gdbarch, addr)); | |
1175 | ||
1176 | #define TYPEINFO_PREFIX "typeinfo for " | |
1177 | #define TYPEINFO_PREFIX_LEN (sizeof (TYPEINFO_PREFIX) - 1) | |
c9d95fa3 | 1178 | symname = typeinfo_sym.minsym->demangled_name (); |
72f1fe8a TT |
1179 | if (symname == NULL || strncmp (symname, TYPEINFO_PREFIX, |
1180 | TYPEINFO_PREFIX_LEN)) | |
1181 | error (_("typeinfo symbol '%s' has unexpected name"), | |
c9d95fa3 | 1182 | typeinfo_sym.minsym->linkage_name ()); |
72f1fe8a TT |
1183 | class_name = symname + TYPEINFO_PREFIX_LEN; |
1184 | ||
1185 | /* Strip off @plt and version suffixes. */ | |
1186 | atsign = strchr (class_name, '@'); | |
1187 | if (atsign != NULL) | |
2f408ecb PA |
1188 | return std::string (class_name, atsign - class_name); |
1189 | return class_name; | |
72f1fe8a TT |
1190 | } |
1191 | ||
1192 | /* Implement the 'get_type_from_type_info' method. */ | |
1193 | ||
1194 | static struct type * | |
1195 | gnuv3_get_type_from_type_info (struct value *type_info_ptr) | |
1196 | { | |
72f1fe8a TT |
1197 | /* We have to parse the type name, since in general there is not a |
1198 | symbol for a type. This is somewhat bogus since there may be a | |
1199 | mis-parse. Another approach might be to re-use the demangler's | |
1200 | internal form to reconstruct the type somehow. */ | |
2f408ecb PA |
1201 | std::string type_name = gnuv3_get_typename_from_type_info (type_info_ptr); |
1202 | expression_up expr (parse_expression (type_name.c_str ())); | |
1203 | struct value *type_val = evaluate_type (expr.get ()); | |
1204 | return value_type (type_val); | |
72f1fe8a TT |
1205 | } |
1206 | ||
b18be20d DJ |
1207 | /* Determine if we are currently in a C++ thunk. If so, get the address |
1208 | of the routine we are thunking to and continue to there instead. */ | |
1209 | ||
1210 | static CORE_ADDR | |
52f729a7 | 1211 | gnuv3_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc) |
b18be20d | 1212 | { |
a513d1e8 | 1213 | CORE_ADDR real_stop_pc, method_stop_pc, func_addr; |
9970f04b | 1214 | struct gdbarch *gdbarch = get_frame_arch (frame); |
3b7344d5 | 1215 | struct bound_minimal_symbol thunk_sym, fn_sym; |
b18be20d | 1216 | struct obj_section *section; |
0d5cff50 | 1217 | const char *thunk_name, *fn_name; |
b18be20d | 1218 | |
9970f04b | 1219 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
b18be20d DJ |
1220 | if (real_stop_pc == 0) |
1221 | real_stop_pc = stop_pc; | |
1222 | ||
1223 | /* Find the linker symbol for this potential thunk. */ | |
3b7344d5 | 1224 | thunk_sym = lookup_minimal_symbol_by_pc (real_stop_pc); |
b18be20d | 1225 | section = find_pc_section (real_stop_pc); |
3b7344d5 | 1226 | if (thunk_sym.minsym == NULL || section == NULL) |
b18be20d DJ |
1227 | return 0; |
1228 | ||
1229 | /* The symbol's demangled name should be something like "virtual | |
1230 | thunk to FUNCTION", where FUNCTION is the name of the function | |
1231 | being thunked to. */ | |
c9d95fa3 | 1232 | thunk_name = thunk_sym.minsym->demangled_name (); |
b18be20d DJ |
1233 | if (thunk_name == NULL || strstr (thunk_name, " thunk to ") == NULL) |
1234 | return 0; | |
1235 | ||
1236 | fn_name = strstr (thunk_name, " thunk to ") + strlen (" thunk to "); | |
1237 | fn_sym = lookup_minimal_symbol (fn_name, NULL, section->objfile); | |
3b7344d5 | 1238 | if (fn_sym.minsym == NULL) |
b18be20d DJ |
1239 | return 0; |
1240 | ||
77e371c0 | 1241 | method_stop_pc = BMSYMBOL_VALUE_ADDRESS (fn_sym); |
a513d1e8 LM |
1242 | |
1243 | /* Some targets have minimal symbols pointing to function descriptors | |
1244 | (powerpc 64 for example). Make sure to retrieve the address | |
1245 | of the real function from the function descriptor before passing on | |
1246 | the address to other layers of GDB. */ | |
328d42d8 SM |
1247 | func_addr = gdbarch_convert_from_func_ptr_addr |
1248 | (gdbarch, method_stop_pc, current_inferior ()->top_target ()); | |
a513d1e8 LM |
1249 | if (func_addr != 0) |
1250 | method_stop_pc = func_addr; | |
1251 | ||
e76f05fa | 1252 | real_stop_pc = gdbarch_skip_trampoline_code |
9970f04b | 1253 | (gdbarch, frame, method_stop_pc); |
b18be20d DJ |
1254 | if (real_stop_pc == 0) |
1255 | real_stop_pc = method_stop_pc; | |
1256 | ||
1257 | return real_stop_pc; | |
1258 | } | |
1259 | ||
62bf63d7 TBA |
1260 | /* A member function is in one these states. */ |
1261 | ||
1262 | enum definition_style | |
1263 | { | |
1264 | DOES_NOT_EXIST_IN_SOURCE, | |
1265 | DEFAULTED_INSIDE, | |
1266 | DEFAULTED_OUTSIDE, | |
1267 | DELETED, | |
1268 | EXPLICIT, | |
1269 | }; | |
1270 | ||
1271 | /* Return how the given field is defined. */ | |
1272 | ||
1273 | static definition_style | |
1274 | get_def_style (struct fn_field *fn, int fieldelem) | |
1275 | { | |
1276 | if (TYPE_FN_FIELD_DELETED (fn, fieldelem)) | |
1277 | return DELETED; | |
1278 | ||
1279 | if (TYPE_FN_FIELD_ARTIFICIAL (fn, fieldelem)) | |
1280 | return DOES_NOT_EXIST_IN_SOURCE; | |
1281 | ||
1282 | switch (TYPE_FN_FIELD_DEFAULTED (fn, fieldelem)) | |
1283 | { | |
1284 | case DW_DEFAULTED_no: | |
1285 | return EXPLICIT; | |
1286 | case DW_DEFAULTED_in_class: | |
1287 | return DEFAULTED_INSIDE; | |
1288 | case DW_DEFAULTED_out_of_class: | |
1289 | return DEFAULTED_OUTSIDE; | |
1290 | default: | |
1291 | break; | |
1292 | } | |
1293 | ||
1294 | return EXPLICIT; | |
1295 | } | |
1296 | ||
1297 | /* Helper functions to determine whether the given definition style | |
1298 | denotes that the definition is user-provided or implicit. | |
1299 | Being defaulted outside the class decl counts as an explicit | |
1300 | user-definition, while being defaulted inside is implicit. */ | |
1301 | ||
1302 | static bool | |
1303 | is_user_provided_def (definition_style def) | |
1304 | { | |
1305 | return def == EXPLICIT || def == DEFAULTED_OUTSIDE; | |
1306 | } | |
1307 | ||
1308 | static bool | |
1309 | is_implicit_def (definition_style def) | |
1310 | { | |
1311 | return def == DOES_NOT_EXIST_IN_SOURCE || def == DEFAULTED_INSIDE; | |
1312 | } | |
1313 | ||
1314 | /* Helper function to decide if METHOD_TYPE is a copy/move | |
1315 | constructor type for CLASS_TYPE. EXPECTED is the expected | |
1316 | type code for the "right-hand-side" argument. | |
1317 | This function is supposed to be used by the IS_COPY_CONSTRUCTOR_TYPE | |
1318 | and IS_MOVE_CONSTRUCTOR_TYPE functions below. Normally, you should | |
1319 | not need to call this directly. */ | |
1320 | ||
1321 | static bool | |
1322 | is_copy_or_move_constructor_type (struct type *class_type, | |
1323 | struct type *method_type, | |
1324 | type_code expected) | |
1325 | { | |
1326 | /* The method should take at least two arguments... */ | |
1f704f76 | 1327 | if (method_type->num_fields () < 2) |
62bf63d7 TBA |
1328 | return false; |
1329 | ||
1330 | /* ...and the second argument should be the same as the class | |
1331 | type, with the expected type code... */ | |
940da03e | 1332 | struct type *arg_type = method_type->field (1).type (); |
62bf63d7 | 1333 | |
78134374 | 1334 | if (arg_type->code () != expected) |
62bf63d7 TBA |
1335 | return false; |
1336 | ||
1337 | struct type *target = check_typedef (TYPE_TARGET_TYPE (arg_type)); | |
1338 | if (!(class_types_same_p (target, class_type))) | |
1339 | return false; | |
1340 | ||
1341 | /* ...and if any of the remaining arguments don't have a default value | |
1342 | then this is not a copy or move constructor, but just a | |
1343 | constructor. */ | |
1f704f76 | 1344 | for (int i = 2; i < method_type->num_fields (); i++) |
62bf63d7 | 1345 | { |
940da03e | 1346 | arg_type = method_type->field (i).type (); |
62bf63d7 TBA |
1347 | /* FIXME aktemur/2019-10-31: As of this date, neither |
1348 | clang++-7.0.0 nor g++-8.2.0 produce a DW_AT_default_value | |
1349 | attribute. GDB is also not set to read this attribute, yet. | |
1350 | Hence, we immediately return false if there are more than | |
1351 | 2 parameters. | |
1352 | GCC bug link: | |
1353 | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42959 | |
1354 | */ | |
1355 | return false; | |
1356 | } | |
1357 | ||
1358 | return true; | |
1359 | } | |
1360 | ||
1361 | /* Return true if METHOD_TYPE is a copy ctor type for CLASS_TYPE. */ | |
1362 | ||
1363 | static bool | |
1364 | is_copy_constructor_type (struct type *class_type, | |
1365 | struct type *method_type) | |
1366 | { | |
1367 | return is_copy_or_move_constructor_type (class_type, method_type, | |
1368 | TYPE_CODE_REF); | |
1369 | } | |
1370 | ||
1371 | /* Return true if METHOD_TYPE is a move ctor type for CLASS_TYPE. */ | |
1372 | ||
1373 | static bool | |
1374 | is_move_constructor_type (struct type *class_type, | |
1375 | struct type *method_type) | |
1376 | { | |
1377 | return is_copy_or_move_constructor_type (class_type, method_type, | |
1378 | TYPE_CODE_RVALUE_REF); | |
1379 | } | |
1380 | ||
9d084466 | 1381 | /* Return pass-by-reference information for the given TYPE. |
41f1b697 DJ |
1382 | |
1383 | The rule in the v3 ABI document comes from section 3.1.1. If the | |
1384 | type has a non-trivial copy constructor or destructor, then the | |
1385 | caller must make a copy (by calling the copy constructor if there | |
1386 | is one or perform the copy itself otherwise), pass the address of | |
1387 | the copy, and then destroy the temporary (if necessary). | |
1388 | ||
62bf63d7 | 1389 | For return values with non-trivial copy/move constructors or |
41f1b697 DJ |
1390 | destructors, space will be allocated in the caller, and a pointer |
1391 | will be passed as the first argument (preceding "this"). | |
1392 | ||
1393 | We don't have a bulletproof mechanism for determining whether a | |
62bf63d7 TBA |
1394 | constructor or destructor is trivial. For GCC and DWARF5 debug |
1395 | information, we can check the calling_convention attribute, | |
1396 | the 'artificial' flag, the 'defaulted' attribute, and the | |
1397 | 'deleted' attribute. */ | |
9d084466 TBA |
1398 | |
1399 | static struct language_pass_by_ref_info | |
41f1b697 DJ |
1400 | gnuv3_pass_by_reference (struct type *type) |
1401 | { | |
1402 | int fieldnum, fieldelem; | |
1403 | ||
f168693b | 1404 | type = check_typedef (type); |
41f1b697 | 1405 | |
9d084466 | 1406 | /* Start with the default values. */ |
48448202 | 1407 | struct language_pass_by_ref_info info; |
9d084466 | 1408 | |
62bf63d7 TBA |
1409 | bool has_cc_attr = false; |
1410 | bool is_pass_by_value = false; | |
1411 | bool is_dynamic = false; | |
1412 | definition_style cctor_def = DOES_NOT_EXIST_IN_SOURCE; | |
1413 | definition_style dtor_def = DOES_NOT_EXIST_IN_SOURCE; | |
1414 | definition_style mctor_def = DOES_NOT_EXIST_IN_SOURCE; | |
9d084466 | 1415 | |
41f1b697 | 1416 | /* We're only interested in things that can have methods. */ |
78134374 SM |
1417 | if (type->code () != TYPE_CODE_STRUCT |
1418 | && type->code () != TYPE_CODE_UNION) | |
9d084466 | 1419 | return info; |
41f1b697 | 1420 | |
62bf63d7 TBA |
1421 | /* The compiler may have emitted the calling convention attribute. |
1422 | Note: GCC does not produce this attribute as of version 9.2.1. | |
1423 | Bug link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92418 */ | |
1424 | if (TYPE_CPLUS_CALLING_CONVENTION (type) == DW_CC_pass_by_value) | |
1425 | { | |
1426 | has_cc_attr = true; | |
1427 | is_pass_by_value = true; | |
1428 | /* Do not return immediately. We have to find out if this type | |
1429 | is copy_constructible and destructible. */ | |
1430 | } | |
1431 | ||
1432 | if (TYPE_CPLUS_CALLING_CONVENTION (type) == DW_CC_pass_by_reference) | |
1433 | { | |
1434 | has_cc_attr = true; | |
1435 | is_pass_by_value = false; | |
1436 | } | |
1437 | ||
ebb8ece2 SC |
1438 | /* A dynamic class has a non-trivial copy constructor. |
1439 | See c++98 section 12.8 Copying class objects [class.copy]. */ | |
1440 | if (gnuv3_dynamic_class (type)) | |
62bf63d7 | 1441 | is_dynamic = true; |
ebb8ece2 | 1442 | |
41f1b697 DJ |
1443 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) |
1444 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
1445 | fieldelem++) | |
1446 | { | |
1447 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
0d5cff50 | 1448 | const char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum); |
41f1b697 DJ |
1449 | struct type *fieldtype = TYPE_FN_FIELD_TYPE (fn, fieldelem); |
1450 | ||
41f1b697 | 1451 | if (name[0] == '~') |
9d084466 | 1452 | { |
62bf63d7 TBA |
1453 | /* We've found a destructor. |
1454 | There should be at most one dtor definition. */ | |
1455 | gdb_assert (dtor_def == DOES_NOT_EXIST_IN_SOURCE); | |
1456 | dtor_def = get_def_style (fn, fieldelem); | |
9d084466 | 1457 | } |
62bf63d7 TBA |
1458 | else if (is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem)) |
1459 | || TYPE_FN_FIELD_CONSTRUCTOR (fn, fieldelem)) | |
82c48ac7 | 1460 | { |
62bf63d7 TBA |
1461 | /* FIXME drow/2007-09-23: We could do this using the name of |
1462 | the method and the name of the class instead of dealing | |
1463 | with the mangled name. We don't have a convenient function | |
1464 | to strip off both leading scope qualifiers and trailing | |
1465 | template arguments yet. */ | |
1466 | if (is_copy_constructor_type (type, fieldtype)) | |
1467 | { | |
1468 | /* There may be more than one cctors. E.g.: one that | |
1469 | take a const parameter and another that takes a | |
1470 | non-const parameter. Such as: | |
1471 | ||
1472 | class K { | |
1473 | K (const K &k)... | |
1474 | K (K &k)... | |
1475 | }; | |
1476 | ||
1477 | It is sufficient for the type to be non-trivial | |
1478 | even only one of the cctors is explicit. | |
1479 | Therefore, update the cctor_def value in the | |
1480 | implicit -> explicit direction, not backwards. */ | |
1481 | ||
1482 | if (is_implicit_def (cctor_def)) | |
1483 | cctor_def = get_def_style (fn, fieldelem); | |
1484 | } | |
1485 | else if (is_move_constructor_type (type, fieldtype)) | |
3433cfa5 | 1486 | { |
62bf63d7 TBA |
1487 | /* Again, there may be multiple move ctors. Update the |
1488 | mctor_def value if we found an explicit def and the | |
1489 | existing one is not explicit. Otherwise retain the | |
1490 | existing value. */ | |
1491 | if (is_implicit_def (mctor_def)) | |
1492 | mctor_def = get_def_style (fn, fieldelem); | |
3433cfa5 | 1493 | } |
82c48ac7 | 1494 | } |
41f1b697 DJ |
1495 | } |
1496 | ||
62bf63d7 TBA |
1497 | bool cctor_implicitly_deleted |
1498 | = (mctor_def != DOES_NOT_EXIST_IN_SOURCE | |
1499 | && cctor_def == DOES_NOT_EXIST_IN_SOURCE); | |
1500 | ||
1501 | bool cctor_explicitly_deleted = (cctor_def == DELETED); | |
1502 | ||
1503 | if (cctor_implicitly_deleted || cctor_explicitly_deleted) | |
1504 | info.copy_constructible = false; | |
1505 | ||
1506 | if (dtor_def == DELETED) | |
1507 | info.destructible = false; | |
1508 | ||
1509 | info.trivially_destructible = is_implicit_def (dtor_def); | |
1510 | ||
1511 | info.trivially_copy_constructible | |
1512 | = (is_implicit_def (cctor_def) | |
1513 | && !is_dynamic); | |
1514 | ||
1515 | info.trivially_copyable | |
1516 | = (info.trivially_copy_constructible | |
1517 | && info.trivially_destructible | |
1518 | && !is_user_provided_def (mctor_def)); | |
1519 | ||
41f1b697 DJ |
1520 | /* Even if all the constructors and destructors were artificial, one |
1521 | of them may have invoked a non-artificial constructor or | |
1522 | destructor in a base class. If any base class needs to be passed | |
1523 | by reference, so does this class. Similarly for members, which | |
1524 | are constructed whenever this class is. We do not need to worry | |
1525 | about recursive loops here, since we are only looking at members | |
bceffbf3 | 1526 | of complete class type. Also ignore any static members. */ |
1f704f76 | 1527 | for (fieldnum = 0; fieldnum < type->num_fields (); fieldnum++) |
ceacbf6e | 1528 | if (!field_is_static (&type->field (fieldnum))) |
9d084466 | 1529 | { |
940da03e | 1530 | struct type *field_type = type->field (fieldnum).type (); |
62bf63d7 TBA |
1531 | |
1532 | /* For arrays, make the decision based on the element type. */ | |
78134374 | 1533 | if (field_type->code () == TYPE_CODE_ARRAY) |
62bf63d7 TBA |
1534 | field_type = check_typedef (TYPE_TARGET_TYPE (field_type)); |
1535 | ||
9d084466 | 1536 | struct language_pass_by_ref_info field_info |
62bf63d7 TBA |
1537 | = gnuv3_pass_by_reference (field_type); |
1538 | ||
1539 | if (!field_info.copy_constructible) | |
1540 | info.copy_constructible = false; | |
1541 | if (!field_info.destructible) | |
1542 | info.destructible = false; | |
9d084466 | 1543 | if (!field_info.trivially_copyable) |
62bf63d7 TBA |
1544 | info.trivially_copyable = false; |
1545 | if (!field_info.trivially_copy_constructible) | |
1546 | info.trivially_copy_constructible = false; | |
1547 | if (!field_info.trivially_destructible) | |
1548 | info.trivially_destructible = false; | |
9d084466 | 1549 | } |
41f1b697 | 1550 | |
62bf63d7 TBA |
1551 | /* Consistency check. */ |
1552 | if (has_cc_attr && info.trivially_copyable != is_pass_by_value) | |
1553 | { | |
1554 | /* DWARF CC attribute is not the same as the inferred value; | |
1555 | use the DWARF attribute. */ | |
1556 | info.trivially_copyable = is_pass_by_value; | |
1557 | } | |
1558 | ||
9d084466 | 1559 | return info; |
41f1b697 DJ |
1560 | } |
1561 | ||
7ed49443 JB |
1562 | static void |
1563 | init_gnuv3_ops (void) | |
1564 | { | |
0963b4bd MS |
1565 | vtable_type_gdbarch_data |
1566 | = gdbarch_data_register_post_init (build_gdb_vtable_type); | |
6e72ca20 TT |
1567 | std_type_info_gdbarch_data |
1568 | = gdbarch_data_register_post_init (build_std_type_info_type); | |
7ed49443 JB |
1569 | |
1570 | gnu_v3_abi_ops.shortname = "gnu-v3"; | |
1571 | gnu_v3_abi_ops.longname = "GNU G++ Version 3 ABI"; | |
1572 | gnu_v3_abi_ops.doc = "G++ Version 3 ABI"; | |
358777b0 EZ |
1573 | gnu_v3_abi_ops.is_destructor_name = |
1574 | (enum dtor_kinds (*) (const char *))is_gnu_v3_mangled_dtor; | |
1575 | gnu_v3_abi_ops.is_constructor_name = | |
1576 | (enum ctor_kinds (*) (const char *))is_gnu_v3_mangled_ctor; | |
7ed49443 JB |
1577 | gnu_v3_abi_ops.is_vtable_name = gnuv3_is_vtable_name; |
1578 | gnu_v3_abi_ops.is_operator_name = gnuv3_is_operator_name; | |
1579 | gnu_v3_abi_ops.rtti_type = gnuv3_rtti_type; | |
1580 | gnu_v3_abi_ops.virtual_fn_field = gnuv3_virtual_fn_field; | |
1514d34e | 1581 | gnu_v3_abi_ops.baseclass_offset = gnuv3_baseclass_offset; |
0d5de010 DJ |
1582 | gnu_v3_abi_ops.print_method_ptr = gnuv3_print_method_ptr; |
1583 | gnu_v3_abi_ops.method_ptr_size = gnuv3_method_ptr_size; | |
1584 | gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr; | |
1585 | gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value; | |
c4aeac85 | 1586 | gnu_v3_abi_ops.print_vtable = gnuv3_print_vtable; |
6e72ca20 TT |
1587 | gnu_v3_abi_ops.get_typeid = gnuv3_get_typeid; |
1588 | gnu_v3_abi_ops.get_typeid_type = gnuv3_get_typeid_type; | |
72f1fe8a | 1589 | gnu_v3_abi_ops.get_type_from_type_info = gnuv3_get_type_from_type_info; |
cc16e6c9 TT |
1590 | gnu_v3_abi_ops.get_typename_from_type_info |
1591 | = gnuv3_get_typename_from_type_info; | |
b18be20d | 1592 | gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline; |
41f1b697 | 1593 | gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference; |
7ed49443 JB |
1594 | } |
1595 | ||
6c265988 | 1596 | void _initialize_gnu_v3_abi (); |
7ed49443 | 1597 | void |
6c265988 | 1598 | _initialize_gnu_v3_abi () |
7ed49443 JB |
1599 | { |
1600 | init_gnuv3_ops (); | |
1601 | ||
fe1f4a5e | 1602 | register_cp_abi (&gnu_v3_abi_ops); |
1605ef26 | 1603 | set_cp_abi_as_auto_default (gnu_v3_abi_ops.shortname); |
7ed49443 | 1604 | } |