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7ed49443 JB |
1 | /* Abstraction of GNU v3 abi. |
2 | Contributed by Jim Blandy <jimb@redhat.com> | |
451fbdda | 3 | |
1d506c26 | 4 | Copyright (C) 2001-2024 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 | 20 | |
ec452525 | 21 | #include "extract-store-integer.h" |
83b6e1f1 | 22 | #include "language.h" |
7ed49443 JB |
23 | #include "value.h" |
24 | #include "cp-abi.h" | |
362ff856 | 25 | #include "cp-support.h" |
7ed49443 | 26 | #include "demangle.h" |
62bf63d7 | 27 | #include "dwarf2.h" |
b18be20d | 28 | #include "objfiles.h" |
0d5de010 | 29 | #include "valprint.h" |
94af9270 | 30 | #include "c-lang.h" |
79d43c61 | 31 | #include "typeprint.h" |
59d3651b | 32 | #include <algorithm> |
7f6aba03 | 33 | #include "cli/cli-style.h" |
7d79de9a | 34 | #include "dwarf2/loc.h" |
328d42d8 | 35 | #include "inferior.h" |
0d5de010 | 36 | |
b27b8843 | 37 | static struct cp_abi_ops gnu_v3_abi_ops; |
7ed49443 | 38 | |
6e72ca20 TT |
39 | /* A gdbarch key for std::type_info, in the event that it can't be |
40 | found in the debug info. */ | |
41 | ||
cb275538 | 42 | static const registry<gdbarch>::key<struct type> std_type_info_gdbarch_data; |
6e72ca20 TT |
43 | |
44 | ||
7ed49443 JB |
45 | static int |
46 | gnuv3_is_vtable_name (const char *name) | |
47 | { | |
61012eef | 48 | return startswith (name, "_ZTV"); |
7ed49443 JB |
49 | } |
50 | ||
51 | static int | |
52 | gnuv3_is_operator_name (const char *name) | |
53 | { | |
8090b426 | 54 | return startswith (name, CP_OPERATOR_STR); |
7ed49443 JB |
55 | } |
56 | ||
57 | ||
58 | /* To help us find the components of a vtable, we build ourselves a | |
59 | GDB type object representing the vtable structure. Following the | |
60 | V3 ABI, it goes something like this: | |
61 | ||
62 | struct gdb_gnu_v3_abi_vtable { | |
63 | ||
64 | / * An array of virtual call and virtual base offsets. The real | |
dda83cd7 SM |
65 | length of this array depends on the class hierarchy; we use |
66 | negative subscripts to access the elements. Yucky, but | |
67 | better than the alternatives. * / | |
7ed49443 JB |
68 | ptrdiff_t vcall_and_vbase_offsets[0]; |
69 | ||
70 | / * The offset from a virtual pointer referring to this table | |
dda83cd7 | 71 | to the top of the complete object. * / |
7ed49443 JB |
72 | ptrdiff_t offset_to_top; |
73 | ||
74 | / * The type_info pointer for this class. This is really a | |
dda83cd7 SM |
75 | std::type_info *, but GDB doesn't really look at the |
76 | type_info object itself, so we don't bother to get the type | |
77 | exactly right. * / | |
7ed49443 JB |
78 | void *type_info; |
79 | ||
80 | / * Virtual table pointers in objects point here. * / | |
81 | ||
82 | / * Virtual function pointers. Like the vcall/vbase array, the | |
dda83cd7 | 83 | real length of this table depends on the class hierarchy. * / |
7ed49443 JB |
84 | void (*virtual_functions[0]) (); |
85 | ||
86 | }; | |
87 | ||
88 | The catch, of course, is that the exact layout of this table | |
89 | depends on the ABI --- word size, endianness, alignment, etc. So | |
90 | the GDB type object is actually a per-architecture kind of thing. | |
91 | ||
92 | vtable_type_gdbarch_data is a gdbarch per-architecture data pointer | |
93 | which refers to the struct type * for this structure, laid out | |
94 | appropriately for the architecture. */ | |
cb275538 | 95 | static const registry<gdbarch>::key<struct type> vtable_type_gdbarch_data; |
7ed49443 JB |
96 | |
97 | ||
98 | /* Human-readable names for the numbers of the fields above. */ | |
99 | enum { | |
100 | vtable_field_vcall_and_vbase_offsets, | |
101 | vtable_field_offset_to_top, | |
102 | vtable_field_type_info, | |
103 | vtable_field_virtual_functions | |
104 | }; | |
105 | ||
106 | ||
107 | /* Return a GDB type representing `struct gdb_gnu_v3_abi_vtable', | |
108 | described above, laid out appropriately for ARCH. | |
109 | ||
110 | We use this function as the gdbarch per-architecture data | |
9970f04b | 111 | initialization function. */ |
cb275538 TT |
112 | static struct type * |
113 | get_gdb_vtable_type (struct gdbarch *arch) | |
7ed49443 JB |
114 | { |
115 | struct type *t; | |
7ed49443 JB |
116 | int offset; |
117 | ||
cb275538 TT |
118 | struct type *result = vtable_type_gdbarch_data.get (arch); |
119 | if (result != nullptr) | |
120 | return result; | |
121 | ||
7ed49443 | 122 | struct type *void_ptr_type |
fde6c819 | 123 | = builtin_type (arch)->builtin_data_ptr; |
7ed49443 | 124 | struct type *ptr_to_void_fn_type |
fde6c819 | 125 | = builtin_type (arch)->builtin_func_ptr; |
7ed49443 | 126 | |
cc495054 TT |
127 | type_allocator alloc (arch); |
128 | ||
7ed49443 JB |
129 | /* ARCH can't give us the true ptrdiff_t type, so we guess. */ |
130 | struct type *ptrdiff_type | |
2d39ccd3 | 131 | = init_integer_type (alloc, gdbarch_ptr_bit (arch), 0, "ptrdiff_t"); |
7ed49443 | 132 | |
2774f2da TV |
133 | t = alloc.new_type (TYPE_CODE_STRUCT, 0, nullptr); |
134 | ||
7ed49443 JB |
135 | /* We assume no padding is necessary, since GDB doesn't know |
136 | anything about alignment at the moment. If this assumption bites | |
137 | us, we should add a gdbarch method which, given a type, returns | |
138 | the alignment that type requires, and then use that here. */ | |
139 | ||
140 | /* Build the field list. */ | |
2774f2da TV |
141 | t->alloc_fields (4); |
142 | ||
7ed49443 JB |
143 | offset = 0; |
144 | ||
145 | /* ptrdiff_t vcall_and_vbase_offsets[0]; */ | |
2774f2da TV |
146 | { |
147 | struct field &field0 = t->field (0); | |
148 | field0.set_name ("vcall_and_vbase_offsets"); | |
149 | field0.set_type (lookup_array_range_type (ptrdiff_type, 0, -1)); | |
150 | field0.set_loc_bitpos (offset * TARGET_CHAR_BIT); | |
151 | offset += field0.type ()->length (); | |
152 | } | |
7ed49443 JB |
153 | |
154 | /* ptrdiff_t offset_to_top; */ | |
2774f2da TV |
155 | { |
156 | struct field &field1 = t->field (1); | |
157 | field1.set_name ("offset_to_top"); | |
158 | field1.set_type (ptrdiff_type); | |
159 | field1.set_loc_bitpos (offset * TARGET_CHAR_BIT); | |
160 | offset += field1.type ()->length (); | |
161 | } | |
7ed49443 JB |
162 | |
163 | /* void *type_info; */ | |
2774f2da TV |
164 | { |
165 | struct field &field2 = t->field (2); | |
166 | field2.set_name ("type_info"); | |
167 | field2.set_type (void_ptr_type); | |
168 | field2.set_loc_bitpos (offset * TARGET_CHAR_BIT); | |
169 | offset += field2.type ()->length (); | |
170 | } | |
7ed49443 JB |
171 | |
172 | /* void (*virtual_functions[0]) (); */ | |
2774f2da TV |
173 | { |
174 | struct field &field3 = t->field (3); | |
175 | field3.set_name ("virtual_functions"); | |
176 | field3.set_type (lookup_array_range_type (ptr_to_void_fn_type, 0, -1)); | |
177 | field3.set_loc_bitpos (offset * TARGET_CHAR_BIT); | |
178 | offset += field3.type ()->length (); | |
179 | } | |
180 | ||
181 | t->set_length (offset); | |
182 | ||
d0e39ea2 | 183 | t->set_name ("gdb_gnu_v3_abi_vtable"); |
e9bb382b | 184 | INIT_CPLUS_SPECIFIC (t); |
7ed49443 | 185 | |
cb275538 TT |
186 | result = make_type_with_address_space (t, TYPE_INSTANCE_FLAG_CODE_SPACE); |
187 | vtable_type_gdbarch_data.set (arch, result); | |
188 | return result; | |
7ed49443 JB |
189 | } |
190 | ||
191 | ||
ed09d7da KB |
192 | /* Return the ptrdiff_t type used in the vtable type. */ |
193 | static struct type * | |
194 | vtable_ptrdiff_type (struct gdbarch *gdbarch) | |
195 | { | |
cb275538 | 196 | struct type *vtable_type = get_gdb_vtable_type (gdbarch); |
ed09d7da KB |
197 | |
198 | /* The "offset_to_top" field has the appropriate (ptrdiff_t) type. */ | |
940da03e | 199 | return vtable_type->field (vtable_field_offset_to_top).type (); |
ed09d7da KB |
200 | } |
201 | ||
7ed49443 JB |
202 | /* Return the offset from the start of the imaginary `struct |
203 | gdb_gnu_v3_abi_vtable' object to the vtable's "address point" | |
204 | (i.e., where objects' virtual table pointers point). */ | |
205 | static int | |
ad4820ab | 206 | vtable_address_point_offset (struct gdbarch *gdbarch) |
7ed49443 | 207 | { |
cb275538 | 208 | struct type *vtable_type = get_gdb_vtable_type (gdbarch); |
7ed49443 | 209 | |
b610c045 | 210 | return (vtable_type->field (vtable_field_virtual_functions).loc_bitpos () |
dda83cd7 | 211 | / TARGET_CHAR_BIT); |
7ed49443 JB |
212 | } |
213 | ||
214 | ||
d48cc9dd DJ |
215 | /* Determine whether structure TYPE is a dynamic class. Cache the |
216 | result. */ | |
217 | ||
218 | static int | |
219 | gnuv3_dynamic_class (struct type *type) | |
220 | { | |
221 | int fieldnum, fieldelem; | |
222 | ||
f168693b | 223 | type = check_typedef (type); |
78134374 SM |
224 | gdb_assert (type->code () == TYPE_CODE_STRUCT |
225 | || type->code () == TYPE_CODE_UNION); | |
5f4ce105 | 226 | |
78134374 | 227 | if (type->code () == TYPE_CODE_UNION) |
5f4ce105 DE |
228 | return 0; |
229 | ||
d48cc9dd DJ |
230 | if (TYPE_CPLUS_DYNAMIC (type)) |
231 | return TYPE_CPLUS_DYNAMIC (type) == 1; | |
232 | ||
233 | ALLOCATE_CPLUS_STRUCT_TYPE (type); | |
234 | ||
235 | for (fieldnum = 0; fieldnum < TYPE_N_BASECLASSES (type); fieldnum++) | |
236 | if (BASETYPE_VIA_VIRTUAL (type, fieldnum) | |
940da03e | 237 | || gnuv3_dynamic_class (type->field (fieldnum).type ())) |
d48cc9dd DJ |
238 | { |
239 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
240 | return 1; | |
241 | } | |
242 | ||
243 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) | |
244 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
245 | fieldelem++) | |
246 | { | |
247 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
248 | ||
249 | if (TYPE_FN_FIELD_VIRTUAL_P (f, fieldelem)) | |
250 | { | |
251 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
252 | return 1; | |
253 | } | |
254 | } | |
255 | ||
256 | TYPE_CPLUS_DYNAMIC (type) = -1; | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* Find the vtable for a value of CONTAINER_TYPE located at | |
261 | CONTAINER_ADDR. Return a value of the correct vtable type for this | |
262 | architecture, or NULL if CONTAINER does not have a vtable. */ | |
263 | ||
264 | static struct value * | |
265 | gnuv3_get_vtable (struct gdbarch *gdbarch, | |
266 | struct type *container_type, CORE_ADDR container_addr) | |
267 | { | |
cb275538 | 268 | struct type *vtable_type = get_gdb_vtable_type (gdbarch); |
d48cc9dd DJ |
269 | struct type *vtable_pointer_type; |
270 | struct value *vtable_pointer; | |
271 | CORE_ADDR vtable_address; | |
272 | ||
f168693b | 273 | container_type = check_typedef (container_type); |
78134374 | 274 | gdb_assert (container_type->code () == TYPE_CODE_STRUCT); |
5f4ce105 | 275 | |
d48cc9dd DJ |
276 | /* If this type does not have a virtual table, don't read the first |
277 | field. */ | |
5f4ce105 | 278 | if (!gnuv3_dynamic_class (container_type)) |
d48cc9dd DJ |
279 | return NULL; |
280 | ||
281 | /* We do not consult the debug information to find the virtual table. | |
282 | The ABI specifies that it is always at offset zero in any class, | |
283 | and debug information may not represent it. | |
284 | ||
285 | We avoid using value_contents on principle, because the object might | |
286 | be large. */ | |
287 | ||
288 | /* Find the type "pointer to virtual table". */ | |
289 | vtable_pointer_type = lookup_pointer_type (vtable_type); | |
290 | ||
291 | /* Load it from the start of the class. */ | |
292 | vtable_pointer = value_at (vtable_pointer_type, container_addr); | |
293 | vtable_address = value_as_address (vtable_pointer); | |
294 | ||
295 | /* Correct it to point at the start of the virtual table, rather | |
296 | than the address point. */ | |
297 | return value_at_lazy (vtable_type, | |
0963b4bd MS |
298 | vtable_address |
299 | - vtable_address_point_offset (gdbarch)); | |
d48cc9dd DJ |
300 | } |
301 | ||
302 | ||
7ed49443 JB |
303 | static struct type * |
304 | gnuv3_rtti_type (struct value *value, | |
dda83cd7 | 305 | int *full_p, LONGEST *top_p, int *using_enc_p) |
7ed49443 | 306 | { |
ad4820ab | 307 | struct gdbarch *gdbarch; |
d0c97917 | 308 | struct type *values_type = check_typedef (value->type ()); |
7ed49443 JB |
309 | struct value *vtable; |
310 | struct minimal_symbol *vtable_symbol; | |
311 | const char *vtable_symbol_name; | |
312 | const char *class_name; | |
7ed49443 JB |
313 | struct type *run_time_type; |
314 | LONGEST offset_to_top; | |
e6a959d6 | 315 | const char *atsign; |
7ed49443 | 316 | |
e95a97d4 | 317 | /* We only have RTTI for dynamic class objects. */ |
78134374 | 318 | if (values_type->code () != TYPE_CODE_STRUCT |
e95a97d4 | 319 | || !gnuv3_dynamic_class (values_type)) |
7ed49443 JB |
320 | return NULL; |
321 | ||
ad4820ab | 322 | /* Determine architecture. */ |
8ee511af | 323 | gdbarch = values_type->arch (); |
7ed49443 | 324 | |
21cfb3b6 DJ |
325 | if (using_enc_p) |
326 | *using_enc_p = 0; | |
327 | ||
5f4ce105 | 328 | vtable = gnuv3_get_vtable (gdbarch, values_type, |
d48cc9dd DJ |
329 | value_as_address (value_addr (value))); |
330 | if (vtable == NULL) | |
331 | return NULL; | |
332 | ||
7ed49443 JB |
333 | /* Find the linker symbol for this vtable. */ |
334 | vtable_symbol | |
9feb2d07 | 335 | = lookup_minimal_symbol_by_pc (vtable->address () |
391f8628 | 336 | + vtable->embedded_offset ()).minsym; |
7ed49443 JB |
337 | if (! vtable_symbol) |
338 | return NULL; | |
339 | ||
340 | /* The symbol's demangled name should be something like "vtable for | |
341 | CLASS", where CLASS is the name of the run-time type of VALUE. | |
342 | If we didn't like this approach, we could instead look in the | |
343 | type_info object itself to get the class name. But this way | |
344 | should work just as well, and doesn't read target memory. */ | |
c9d95fa3 | 345 | vtable_symbol_name = vtable_symbol->demangled_name (); |
98081e55 | 346 | if (vtable_symbol_name == NULL |
61012eef | 347 | || !startswith (vtable_symbol_name, "vtable for ")) |
f773fdbb | 348 | { |
8a3fe4f8 | 349 | warning (_("can't find linker symbol for virtual table for `%s' value"), |
0a07729b | 350 | TYPE_SAFE_NAME (values_type)); |
f773fdbb | 351 | if (vtable_symbol_name) |
8a3fe4f8 | 352 | warning (_(" found `%s' instead"), vtable_symbol_name); |
f773fdbb JM |
353 | return NULL; |
354 | } | |
7ed49443 JB |
355 | class_name = vtable_symbol_name + 11; |
356 | ||
8de20a37 TT |
357 | /* Strip off @plt and version suffixes. */ |
358 | atsign = strchr (class_name, '@'); | |
359 | if (atsign != NULL) | |
360 | { | |
361 | char *copy; | |
362 | ||
224c3ddb | 363 | copy = (char *) alloca (atsign - class_name + 1); |
8de20a37 TT |
364 | memcpy (copy, class_name, atsign - class_name); |
365 | copy[atsign - class_name] = '\0'; | |
366 | class_name = copy; | |
367 | } | |
368 | ||
7ed49443 | 369 | /* Try to look up the class name as a type name. */ |
0963b4bd | 370 | /* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */ |
362ff856 MC |
371 | run_time_type = cp_lookup_rtti_type (class_name, NULL); |
372 | if (run_time_type == NULL) | |
373 | return NULL; | |
7ed49443 JB |
374 | |
375 | /* Get the offset from VALUE to the top of the complete object. | |
376 | NOTE: this is the reverse of the meaning of *TOP_P. */ | |
377 | offset_to_top | |
378 | = value_as_long (value_field (vtable, vtable_field_offset_to_top)); | |
379 | ||
380 | if (full_p) | |
391f8628 | 381 | *full_p = (- offset_to_top == value->embedded_offset () |
463b870d | 382 | && (value->enclosing_type ()->length () |
df86565b | 383 | >= run_time_type->length ())); |
7ed49443 JB |
384 | if (top_p) |
385 | *top_p = - offset_to_top; | |
7ed49443 JB |
386 | return run_time_type; |
387 | } | |
388 | ||
0d5de010 DJ |
389 | /* Return a function pointer for CONTAINER's VTABLE_INDEX'th virtual |
390 | function, of type FNTYPE. */ | |
7ed49443 | 391 | |
0d5de010 | 392 | static struct value * |
ad4820ab UW |
393 | gnuv3_get_virtual_fn (struct gdbarch *gdbarch, struct value *container, |
394 | struct type *fntype, int vtable_index) | |
0d5de010 | 395 | { |
d48cc9dd DJ |
396 | struct value *vtable, *vfn; |
397 | ||
398 | /* Every class with virtual functions must have a vtable. */ | |
d0c97917 | 399 | vtable = gnuv3_get_vtable (gdbarch, container->type (), |
d48cc9dd DJ |
400 | value_as_address (value_addr (container))); |
401 | gdb_assert (vtable != NULL); | |
7ed49443 JB |
402 | |
403 | /* Fetch the appropriate function pointer from the vtable. */ | |
404 | vfn = value_subscript (value_field (vtable, vtable_field_virtual_functions), | |
dda83cd7 | 405 | vtable_index); |
7ed49443 | 406 | |
0d5de010 DJ |
407 | /* If this architecture uses function descriptors directly in the vtable, |
408 | then the address of the vtable entry is actually a "function pointer" | |
409 | (i.e. points to the descriptor). We don't need to scale the index | |
85102364 | 410 | by the size of a function descriptor; GCC does that before outputting |
0d5de010 | 411 | debug information. */ |
ad4820ab | 412 | if (gdbarch_vtable_function_descriptors (gdbarch)) |
0d5de010 | 413 | vfn = value_addr (vfn); |
7ed49443 | 414 | |
0d5de010 DJ |
415 | /* Cast the function pointer to the appropriate type. */ |
416 | vfn = value_cast (lookup_pointer_type (fntype), vfn); | |
76b79d6e | 417 | |
7ed49443 JB |
418 | return vfn; |
419 | } | |
420 | ||
0d5de010 DJ |
421 | /* GNU v3 implementation of value_virtual_fn_field. See cp-abi.h |
422 | for a description of the arguments. */ | |
423 | ||
424 | static struct value * | |
425 | gnuv3_virtual_fn_field (struct value **value_p, | |
dda83cd7 | 426 | struct fn_field *f, int j, |
0d5de010 DJ |
427 | struct type *vfn_base, int offset) |
428 | { | |
d0c97917 | 429 | struct type *values_type = check_typedef ((*value_p)->type ()); |
ad4820ab | 430 | struct gdbarch *gdbarch; |
0d5de010 DJ |
431 | |
432 | /* Some simple sanity checks. */ | |
78134374 | 433 | if (values_type->code () != TYPE_CODE_STRUCT) |
0d5de010 DJ |
434 | error (_("Only classes can have virtual functions.")); |
435 | ||
ad4820ab | 436 | /* Determine architecture. */ |
8ee511af | 437 | gdbarch = values_type->arch (); |
ad4820ab | 438 | |
0d5de010 DJ |
439 | /* Cast our value to the base class which defines this virtual |
440 | function. This takes care of any necessary `this' | |
441 | adjustments. */ | |
442 | if (vfn_base != values_type) | |
443 | *value_p = value_cast (vfn_base, *value_p); | |
444 | ||
ad4820ab | 445 | return gnuv3_get_virtual_fn (gdbarch, *value_p, TYPE_FN_FIELD_TYPE (f, j), |
0d5de010 DJ |
446 | TYPE_FN_FIELD_VOFFSET (f, j)); |
447 | } | |
448 | ||
1514d34e DJ |
449 | /* Compute the offset of the baseclass which is |
450 | the INDEXth baseclass of class TYPE, | |
451 | for value at VALADDR (in host) at ADDRESS (in target). | |
452 | The result is the offset of the baseclass value relative | |
453 | to (the address of)(ARG) + OFFSET. | |
454 | ||
0963b4bd MS |
455 | -1 is returned on error. */ |
456 | ||
b9362cc7 | 457 | static int |
8af8e3bc | 458 | gnuv3_baseclass_offset (struct type *type, int index, |
6b850546 | 459 | const bfd_byte *valaddr, LONGEST embedded_offset, |
8af8e3bc | 460 | CORE_ADDR address, const struct value *val) |
1514d34e | 461 | { |
ad4820ab | 462 | struct gdbarch *gdbarch; |
ad4820ab | 463 | struct type *ptr_type; |
79d5b63a | 464 | struct value *vtable; |
2497b498 | 465 | struct value *vbase_array; |
1514d34e | 466 | long int cur_base_offset, base_offset; |
1514d34e | 467 | |
ad4820ab | 468 | /* Determine architecture. */ |
8ee511af | 469 | gdbarch = type->arch (); |
ad4820ab UW |
470 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
471 | ||
1514d34e | 472 | /* If it isn't a virtual base, this is easy. The offset is in the |
9c37b5ae TT |
473 | type definition. */ |
474 | if (!BASETYPE_VIA_VIRTUAL (type, index)) | |
1514d34e DJ |
475 | return TYPE_BASECLASS_BITPOS (type, index) / 8; |
476 | ||
7d79de9a | 477 | /* If we have a DWARF expression for the offset, evaluate it. */ |
2ad53ea1 | 478 | if (type->field (index).loc_kind () == FIELD_LOC_KIND_DWARF_BLOCK) |
7d79de9a TT |
479 | { |
480 | struct dwarf2_property_baton baton; | |
481 | baton.property_type | |
940da03e | 482 | = lookup_pointer_type (type->field (index).type ()); |
51e36a3a | 483 | baton.locexpr = *type->field (index).loc_dwarf_block (); |
7d79de9a TT |
484 | |
485 | struct dynamic_prop prop; | |
8c2e4e06 | 486 | prop.set_locexpr (&baton); |
7d79de9a TT |
487 | |
488 | struct property_addr_info addr_stack; | |
489 | addr_stack.type = type; | |
490 | /* Note that we don't set "valaddr" here. Doing so causes | |
491 | regressions. FIXME. */ | |
492 | addr_stack.addr = address + embedded_offset; | |
493 | addr_stack.next = nullptr; | |
494 | ||
495 | CORE_ADDR result; | |
496 | if (dwarf2_evaluate_property (&prop, nullptr, &addr_stack, &result, | |
1fb43cf7 | 497 | {addr_stack.addr})) |
7d79de9a TT |
498 | return (int) (result - addr_stack.addr); |
499 | } | |
500 | ||
1514d34e DJ |
501 | /* To access a virtual base, we need to use the vbase offset stored in |
502 | our vtable. Recent GCC versions provide this information. If it isn't | |
503 | available, we could get what we needed from RTTI, or from drawing the | |
504 | complete inheritance graph based on the debug info. Neither is | |
505 | worthwhile. */ | |
506 | cur_base_offset = TYPE_BASECLASS_BITPOS (type, index) / 8; | |
ad4820ab | 507 | if (cur_base_offset >= - vtable_address_point_offset (gdbarch)) |
8a3fe4f8 | 508 | error (_("Expected a negative vbase offset (old compiler?)")); |
1514d34e | 509 | |
ad4820ab | 510 | cur_base_offset = cur_base_offset + vtable_address_point_offset (gdbarch); |
df86565b | 511 | if ((- cur_base_offset) % ptr_type->length () != 0) |
8a3fe4f8 | 512 | error (_("Misaligned vbase offset.")); |
df86565b | 513 | cur_base_offset = cur_base_offset / ((int) ptr_type->length ()); |
1514d34e | 514 | |
8af8e3bc | 515 | vtable = gnuv3_get_vtable (gdbarch, type, address + embedded_offset); |
d48cc9dd | 516 | gdb_assert (vtable != NULL); |
1514d34e | 517 | vbase_array = value_field (vtable, vtable_field_vcall_and_vbase_offsets); |
2497b498 | 518 | base_offset = value_as_long (value_subscript (vbase_array, cur_base_offset)); |
1514d34e DJ |
519 | return base_offset; |
520 | } | |
7ed49443 | 521 | |
0d5de010 DJ |
522 | /* Locate a virtual method in DOMAIN or its non-virtual base classes |
523 | which has virtual table index VOFFSET. The method has an associated | |
524 | "this" adjustment of ADJUSTMENT bytes. */ | |
525 | ||
2c0b251b | 526 | static const char * |
0d5de010 DJ |
527 | gnuv3_find_method_in (struct type *domain, CORE_ADDR voffset, |
528 | LONGEST adjustment) | |
529 | { | |
530 | int i; | |
0d5de010 DJ |
531 | |
532 | /* Search this class first. */ | |
0d5de010 DJ |
533 | if (adjustment == 0) |
534 | { | |
535 | int len; | |
536 | ||
537 | len = TYPE_NFN_FIELDS (domain); | |
538 | for (i = 0; i < len; i++) | |
539 | { | |
540 | int len2, j; | |
541 | struct fn_field *f; | |
542 | ||
543 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
544 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
545 | ||
546 | check_stub_method_group (domain, i); | |
547 | for (j = 0; j < len2; j++) | |
548 | if (TYPE_FN_FIELD_VOFFSET (f, j) == voffset) | |
549 | return TYPE_FN_FIELD_PHYSNAME (f, j); | |
550 | } | |
551 | } | |
552 | ||
553 | /* Next search non-virtual bases. If it's in a virtual base, | |
554 | we're out of luck. */ | |
555 | for (i = 0; i < TYPE_N_BASECLASSES (domain); i++) | |
556 | { | |
557 | int pos; | |
558 | struct type *basetype; | |
559 | ||
560 | if (BASETYPE_VIA_VIRTUAL (domain, i)) | |
561 | continue; | |
562 | ||
563 | pos = TYPE_BASECLASS_BITPOS (domain, i) / 8; | |
940da03e | 564 | basetype = domain->field (i).type (); |
0d5de010 DJ |
565 | /* Recurse with a modified adjustment. We don't need to adjust |
566 | voffset. */ | |
df86565b | 567 | if (adjustment >= pos && adjustment < pos + basetype->length ()) |
0d5de010 DJ |
568 | return gnuv3_find_method_in (basetype, voffset, adjustment - pos); |
569 | } | |
570 | ||
571 | return NULL; | |
572 | } | |
573 | ||
fead6908 UW |
574 | /* Decode GNU v3 method pointer. */ |
575 | ||
576 | static int | |
ad4820ab UW |
577 | gnuv3_decode_method_ptr (struct gdbarch *gdbarch, |
578 | const gdb_byte *contents, | |
fead6908 UW |
579 | CORE_ADDR *value_p, |
580 | LONGEST *adjustment_p) | |
581 | { | |
ad4820ab | 582 | struct type *funcptr_type = builtin_type (gdbarch)->builtin_func_ptr; |
ed09d7da | 583 | struct type *offset_type = vtable_ptrdiff_type (gdbarch); |
e17a4113 | 584 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
fead6908 UW |
585 | CORE_ADDR ptr_value; |
586 | LONGEST voffset, adjustment; | |
587 | int vbit; | |
588 | ||
589 | /* Extract the pointer to member. The first element is either a pointer | |
590 | or a vtable offset. For pointers, we need to use extract_typed_address | |
591 | to allow the back-end to convert the pointer to a GDB address -- but | |
592 | vtable offsets we must handle as integers. At this point, we do not | |
593 | yet know which case we have, so we extract the value under both | |
594 | interpretations and choose the right one later on. */ | |
595 | ptr_value = extract_typed_address (contents, funcptr_type); | |
e17a4113 | 596 | voffset = extract_signed_integer (contents, |
df86565b SM |
597 | funcptr_type->length (), byte_order); |
598 | contents += funcptr_type->length (); | |
e17a4113 | 599 | adjustment = extract_signed_integer (contents, |
df86565b | 600 | offset_type->length (), byte_order); |
fead6908 | 601 | |
ad4820ab | 602 | if (!gdbarch_vbit_in_delta (gdbarch)) |
fead6908 UW |
603 | { |
604 | vbit = voffset & 1; | |
605 | voffset = voffset ^ vbit; | |
606 | } | |
607 | else | |
608 | { | |
609 | vbit = adjustment & 1; | |
610 | adjustment = adjustment >> 1; | |
611 | } | |
612 | ||
613 | *value_p = vbit? voffset : ptr_value; | |
614 | *adjustment_p = adjustment; | |
615 | return vbit; | |
616 | } | |
617 | ||
0d5de010 DJ |
618 | /* GNU v3 implementation of cplus_print_method_ptr. */ |
619 | ||
620 | static void | |
621 | gnuv3_print_method_ptr (const gdb_byte *contents, | |
622 | struct type *type, | |
623 | struct ui_file *stream) | |
624 | { | |
09e2d7c7 | 625 | struct type *self_type = TYPE_SELF_TYPE (type); |
8ee511af | 626 | struct gdbarch *gdbarch = self_type->arch (); |
0d5de010 DJ |
627 | CORE_ADDR ptr_value; |
628 | LONGEST adjustment; | |
0d5de010 DJ |
629 | int vbit; |
630 | ||
0d5de010 | 631 | /* Extract the pointer to member. */ |
ad4820ab | 632 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
633 | |
634 | /* Check for NULL. */ | |
635 | if (ptr_value == 0 && vbit == 0) | |
636 | { | |
6cb06a8c | 637 | gdb_printf (stream, "NULL"); |
0d5de010 DJ |
638 | return; |
639 | } | |
640 | ||
641 | /* Search for a virtual method. */ | |
642 | if (vbit) | |
643 | { | |
644 | CORE_ADDR voffset; | |
645 | const char *physname; | |
646 | ||
647 | /* It's a virtual table offset, maybe in this class. Search | |
648 | for a field with the correct vtable offset. First convert it | |
649 | to an index, as used in TYPE_FN_FIELD_VOFFSET. */ | |
df86565b | 650 | voffset = ptr_value / vtable_ptrdiff_type (gdbarch)->length (); |
0d5de010 | 651 | |
09e2d7c7 | 652 | physname = gnuv3_find_method_in (self_type, voffset, adjustment); |
0d5de010 DJ |
653 | |
654 | /* If we found a method, print that. We don't bother to disambiguate | |
655 | possible paths to the method based on the adjustment. */ | |
656 | if (physname) | |
657 | { | |
3456e70c TT |
658 | gdb::unique_xmalloc_ptr<char> demangled_name |
659 | = gdb_demangle (physname, DMGL_ANSI | DMGL_PARAMS); | |
d8734c88 | 660 | |
6cb06a8c | 661 | gdb_printf (stream, "&virtual "); |
94af9270 | 662 | if (demangled_name == NULL) |
0426ad51 | 663 | gdb_puts (physname, stream); |
94af9270 | 664 | else |
0426ad51 | 665 | gdb_puts (demangled_name.get (), stream); |
94af9270 | 666 | return; |
0d5de010 DJ |
667 | } |
668 | } | |
94af9270 KS |
669 | else if (ptr_value != 0) |
670 | { | |
671 | /* Found a non-virtual function: print out the type. */ | |
0426ad51 | 672 | gdb_puts ("(", stream); |
1c6fbf42 PA |
673 | c_print_type (type, "", stream, -1, 0, current_language->la_language, |
674 | &type_print_raw_options); | |
0426ad51 | 675 | gdb_puts (") ", stream); |
94af9270 | 676 | } |
0d5de010 DJ |
677 | |
678 | /* We didn't find it; print the raw data. */ | |
679 | if (vbit) | |
680 | { | |
6cb06a8c | 681 | gdb_printf (stream, "&virtual table offset "); |
0d5de010 DJ |
682 | print_longest (stream, 'd', 1, ptr_value); |
683 | } | |
684 | else | |
edf0c1b7 TT |
685 | { |
686 | struct value_print_options opts; | |
687 | ||
688 | get_user_print_options (&opts); | |
689 | print_address_demangle (&opts, gdbarch, ptr_value, stream, demangle); | |
690 | } | |
0d5de010 DJ |
691 | |
692 | if (adjustment) | |
693 | { | |
6cb06a8c | 694 | gdb_printf (stream, ", this adjustment "); |
0d5de010 DJ |
695 | print_longest (stream, 'd', 1, adjustment); |
696 | } | |
697 | } | |
698 | ||
699 | /* GNU v3 implementation of cplus_method_ptr_size. */ | |
700 | ||
701 | static int | |
ad4820ab | 702 | gnuv3_method_ptr_size (struct type *type) |
0d5de010 | 703 | { |
df86565b | 704 | return 2 * builtin_type (type->arch ())->builtin_data_ptr->length (); |
0d5de010 DJ |
705 | } |
706 | ||
707 | /* GNU v3 implementation of cplus_make_method_ptr. */ | |
708 | ||
709 | static void | |
ad4820ab UW |
710 | gnuv3_make_method_ptr (struct type *type, gdb_byte *contents, |
711 | CORE_ADDR value, int is_virtual) | |
0d5de010 | 712 | { |
8ee511af | 713 | struct gdbarch *gdbarch = type->arch (); |
df86565b | 714 | int size = builtin_type (gdbarch)->builtin_data_ptr->length (); |
34877895 | 715 | enum bfd_endian byte_order = type_byte_order (type); |
0d5de010 DJ |
716 | |
717 | /* FIXME drow/2006-12-24: The adjustment of "this" is currently | |
718 | always zero, since the method pointer is of the correct type. | |
719 | But if the method pointer came from a base class, this is | |
720 | incorrect - it should be the offset to the base. The best | |
721 | fix might be to create the pointer to member pointing at the | |
722 | base class and cast it to the derived class, but that requires | |
723 | support for adjusting pointers to members when casting them - | |
724 | not currently supported by GDB. */ | |
725 | ||
ad4820ab | 726 | if (!gdbarch_vbit_in_delta (gdbarch)) |
0d5de010 | 727 | { |
e17a4113 UW |
728 | store_unsigned_integer (contents, size, byte_order, value | is_virtual); |
729 | store_unsigned_integer (contents + size, size, byte_order, 0); | |
0d5de010 DJ |
730 | } |
731 | else | |
732 | { | |
e17a4113 UW |
733 | store_unsigned_integer (contents, size, byte_order, value); |
734 | store_unsigned_integer (contents + size, size, byte_order, is_virtual); | |
0d5de010 DJ |
735 | } |
736 | } | |
737 | ||
738 | /* GNU v3 implementation of cplus_method_ptr_to_value. */ | |
739 | ||
740 | static struct value * | |
741 | gnuv3_method_ptr_to_value (struct value **this_p, struct value *method_ptr) | |
742 | { | |
ad4820ab | 743 | struct gdbarch *gdbarch; |
efaf1ae0 | 744 | const gdb_byte *contents = method_ptr->contents ().data (); |
0d5de010 | 745 | CORE_ADDR ptr_value; |
09e2d7c7 | 746 | struct type *self_type, *final_type, *method_type; |
0d5de010 | 747 | LONGEST adjustment; |
0d5de010 DJ |
748 | int vbit; |
749 | ||
d0c97917 | 750 | self_type = TYPE_SELF_TYPE (check_typedef (method_ptr->type ())); |
09e2d7c7 | 751 | final_type = lookup_pointer_type (self_type); |
0d5de010 | 752 | |
d0c97917 | 753 | method_type = check_typedef (method_ptr->type ())->target_type (); |
0d5de010 | 754 | |
fead6908 | 755 | /* Extract the pointer to member. */ |
8ee511af | 756 | gdbarch = self_type->arch (); |
ad4820ab | 757 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
758 | |
759 | /* First convert THIS to match the containing type of the pointer to | |
760 | member. This cast may adjust the value of THIS. */ | |
761 | *this_p = value_cast (final_type, *this_p); | |
762 | ||
763 | /* Then apply whatever adjustment is necessary. This creates a somewhat | |
764 | strange pointer: it claims to have type FINAL_TYPE, but in fact it | |
765 | might not be a valid FINAL_TYPE. For instance, it might be a | |
766 | base class of FINAL_TYPE. And if it's not the primary base class, | |
767 | then printing it out as a FINAL_TYPE object would produce some pretty | |
768 | garbage. | |
769 | ||
770 | But we don't really know the type of the first argument in | |
771 | METHOD_TYPE either, which is why this happens. We can't | |
772 | dereference this later as a FINAL_TYPE, but once we arrive in the | |
773 | called method we'll have debugging information for the type of | |
774 | "this" - and that'll match the value we produce here. | |
775 | ||
776 | You can provoke this case by casting a Base::* to a Derived::*, for | |
777 | instance. */ | |
ad4820ab | 778 | *this_p = value_cast (builtin_type (gdbarch)->builtin_data_ptr, *this_p); |
2497b498 | 779 | *this_p = value_ptradd (*this_p, adjustment); |
0d5de010 DJ |
780 | *this_p = value_cast (final_type, *this_p); |
781 | ||
782 | if (vbit) | |
783 | { | |
ad4820ab | 784 | LONGEST voffset; |
d8734c88 | 785 | |
df86565b | 786 | voffset = ptr_value / vtable_ptrdiff_type (gdbarch)->length (); |
ad4820ab UW |
787 | return gnuv3_get_virtual_fn (gdbarch, value_ind (*this_p), |
788 | method_type, voffset); | |
0d5de010 DJ |
789 | } |
790 | else | |
791 | return value_from_pointer (lookup_pointer_type (method_type), ptr_value); | |
792 | } | |
793 | ||
c4aeac85 TT |
794 | /* Objects of this type are stored in a hash table and a vector when |
795 | printing the vtables for a class. */ | |
796 | ||
797 | struct value_and_voffset | |
798 | { | |
799 | /* The value representing the object. */ | |
800 | struct value *value; | |
801 | ||
802 | /* The maximum vtable offset we've found for any object at this | |
803 | offset in the outermost object. */ | |
804 | int max_voffset; | |
805 | }; | |
806 | ||
c4aeac85 TT |
807 | /* Hash function for value_and_voffset. */ |
808 | ||
809 | static hashval_t | |
810 | hash_value_and_voffset (const void *p) | |
811 | { | |
9a3c8263 | 812 | const struct value_and_voffset *o = (const struct value_and_voffset *) p; |
c4aeac85 | 813 | |
9feb2d07 | 814 | return o->value->address () + o->value->embedded_offset (); |
c4aeac85 TT |
815 | } |
816 | ||
817 | /* Equality function for value_and_voffset. */ | |
818 | ||
819 | static int | |
820 | eq_value_and_voffset (const void *a, const void *b) | |
821 | { | |
9a3c8263 SM |
822 | const struct value_and_voffset *ova = (const struct value_and_voffset *) a; |
823 | const struct value_and_voffset *ovb = (const struct value_and_voffset *) b; | |
c4aeac85 | 824 | |
9feb2d07 TT |
825 | return (ova->value->address () + ova->value->embedded_offset () |
826 | == ovb->value->address () + ovb->value->embedded_offset ()); | |
c4aeac85 TT |
827 | } |
828 | ||
59d3651b | 829 | /* Comparison function for value_and_voffset. */ |
c4aeac85 | 830 | |
59d3651b TT |
831 | static bool |
832 | compare_value_and_voffset (const struct value_and_voffset *va, | |
833 | const struct value_and_voffset *vb) | |
c4aeac85 | 834 | { |
9feb2d07 | 835 | CORE_ADDR addra = (va->value->address () |
391f8628 | 836 | + va->value->embedded_offset ()); |
9feb2d07 | 837 | CORE_ADDR addrb = (vb->value->address () |
391f8628 | 838 | + vb->value->embedded_offset ()); |
59d3651b TT |
839 | |
840 | return addra < addrb; | |
c4aeac85 TT |
841 | } |
842 | ||
843 | /* A helper function used when printing vtables. This determines the | |
844 | key (most derived) sub-object at each address and also computes the | |
845 | maximum vtable offset seen for the corresponding vtable. Updates | |
846 | OFFSET_HASH and OFFSET_VEC with a new value_and_voffset object, if | |
847 | needed. VALUE is the object to examine. */ | |
848 | ||
849 | static void | |
850 | compute_vtable_size (htab_t offset_hash, | |
59d3651b | 851 | std::vector<value_and_voffset *> *offset_vec, |
c4aeac85 TT |
852 | struct value *value) |
853 | { | |
854 | int i; | |
d0c97917 | 855 | struct type *type = check_typedef (value->type ()); |
c4aeac85 TT |
856 | void **slot; |
857 | struct value_and_voffset search_vo, *current_vo; | |
c4aeac85 | 858 | |
78134374 | 859 | gdb_assert (type->code () == TYPE_CODE_STRUCT); |
5f4ce105 | 860 | |
c4aeac85 TT |
861 | /* If the object is not dynamic, then we are done; as it cannot have |
862 | dynamic base types either. */ | |
863 | if (!gnuv3_dynamic_class (type)) | |
864 | return; | |
865 | ||
866 | /* Update the hash and the vec, if needed. */ | |
867 | search_vo.value = value; | |
868 | slot = htab_find_slot (offset_hash, &search_vo, INSERT); | |
869 | if (*slot) | |
9a3c8263 | 870 | current_vo = (struct value_and_voffset *) *slot; |
c4aeac85 TT |
871 | else |
872 | { | |
873 | current_vo = XNEW (struct value_and_voffset); | |
874 | current_vo->value = value; | |
875 | current_vo->max_voffset = -1; | |
876 | *slot = current_vo; | |
59d3651b | 877 | offset_vec->push_back (current_vo); |
c4aeac85 TT |
878 | } |
879 | ||
880 | /* Update the value_and_voffset object with the highest vtable | |
881 | offset from this class. */ | |
882 | for (i = 0; i < TYPE_NFN_FIELDS (type); ++i) | |
883 | { | |
884 | int j; | |
885 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, i); | |
886 | ||
887 | for (j = 0; j < TYPE_FN_FIELDLIST_LENGTH (type, i); ++j) | |
888 | { | |
889 | if (TYPE_FN_FIELD_VIRTUAL_P (fn, j)) | |
890 | { | |
891 | int voffset = TYPE_FN_FIELD_VOFFSET (fn, j); | |
892 | ||
893 | if (voffset > current_vo->max_voffset) | |
894 | current_vo->max_voffset = voffset; | |
895 | } | |
896 | } | |
897 | } | |
898 | ||
899 | /* Recurse into base classes. */ | |
900 | for (i = 0; i < TYPE_N_BASECLASSES (type); ++i) | |
901 | compute_vtable_size (offset_hash, offset_vec, value_field (value, i)); | |
902 | } | |
903 | ||
904 | /* Helper for gnuv3_print_vtable that prints a single vtable. */ | |
905 | ||
906 | static void | |
907 | print_one_vtable (struct gdbarch *gdbarch, struct value *value, | |
908 | int max_voffset, | |
909 | struct value_print_options *opts) | |
910 | { | |
911 | int i; | |
d0c97917 | 912 | struct type *type = check_typedef (value->type ()); |
c4aeac85 TT |
913 | struct value *vtable; |
914 | CORE_ADDR vt_addr; | |
915 | ||
916 | vtable = gnuv3_get_vtable (gdbarch, type, | |
9feb2d07 | 917 | value->address () |
391f8628 | 918 | + value->embedded_offset ()); |
9feb2d07 TT |
919 | vt_addr = value_field (vtable, |
920 | vtable_field_virtual_functions)->address (); | |
c4aeac85 | 921 | |
6cb06a8c TT |
922 | gdb_printf (_("vtable for '%s' @ %s (subobject @ %s):\n"), |
923 | TYPE_SAFE_NAME (type), | |
924 | paddress (gdbarch, vt_addr), | |
9feb2d07 | 925 | paddress (gdbarch, (value->address () |
391f8628 | 926 | + value->embedded_offset ()))); |
c4aeac85 TT |
927 | |
928 | for (i = 0; i <= max_voffset; ++i) | |
929 | { | |
cafe75b0 JK |
930 | /* Initialize it just to avoid a GCC false warning. */ |
931 | CORE_ADDR addr = 0; | |
492d29ea | 932 | int got_error = 0; |
c4aeac85 | 933 | struct value *vfn; |
c4aeac85 | 934 | |
6cb06a8c | 935 | gdb_printf ("[%d]: ", i); |
c4aeac85 TT |
936 | |
937 | vfn = value_subscript (value_field (vtable, | |
938 | vtable_field_virtual_functions), | |
939 | i); | |
940 | ||
941 | if (gdbarch_vtable_function_descriptors (gdbarch)) | |
942 | vfn = value_addr (vfn); | |
943 | ||
a70b8144 | 944 | try |
c4aeac85 TT |
945 | { |
946 | addr = value_as_address (vfn); | |
947 | } | |
230d2906 | 948 | catch (const gdb_exception_error &ex) |
492d29ea | 949 | { |
7f6aba03 TT |
950 | fprintf_styled (gdb_stdout, metadata_style.style (), |
951 | _("<error: %s>"), ex.what ()); | |
492d29ea PA |
952 | got_error = 1; |
953 | } | |
492d29ea PA |
954 | |
955 | if (!got_error) | |
edf0c1b7 | 956 | print_function_pointer_address (opts, gdbarch, addr, gdb_stdout); |
6cb06a8c | 957 | gdb_printf ("\n"); |
c4aeac85 TT |
958 | } |
959 | } | |
960 | ||
961 | /* Implementation of the print_vtable method. */ | |
962 | ||
963 | static void | |
964 | gnuv3_print_vtable (struct value *value) | |
965 | { | |
966 | struct gdbarch *gdbarch; | |
967 | struct type *type; | |
968 | struct value *vtable; | |
969 | struct value_print_options opts; | |
59d3651b | 970 | int count; |
c4aeac85 TT |
971 | |
972 | value = coerce_ref (value); | |
d0c97917 | 973 | type = check_typedef (value->type ()); |
78134374 | 974 | if (type->code () == TYPE_CODE_PTR) |
c4aeac85 TT |
975 | { |
976 | value = value_ind (value); | |
d0c97917 | 977 | type = check_typedef (value->type ()); |
c4aeac85 TT |
978 | } |
979 | ||
980 | get_user_print_options (&opts); | |
981 | ||
982 | /* Respect 'set print object'. */ | |
983 | if (opts.objectprint) | |
984 | { | |
985 | value = value_full_object (value, NULL, 0, 0, 0); | |
d0c97917 | 986 | type = check_typedef (value->type ()); |
c4aeac85 TT |
987 | } |
988 | ||
8ee511af | 989 | gdbarch = type->arch (); |
5f4ce105 DE |
990 | |
991 | vtable = NULL; | |
78134374 | 992 | if (type->code () == TYPE_CODE_STRUCT) |
5f4ce105 DE |
993 | vtable = gnuv3_get_vtable (gdbarch, type, |
994 | value_as_address (value_addr (value))); | |
c4aeac85 TT |
995 | |
996 | if (!vtable) | |
997 | { | |
6cb06a8c | 998 | gdb_printf (_("This object does not have a virtual function table\n")); |
c4aeac85 TT |
999 | return; |
1000 | } | |
1001 | ||
fc4007c9 TT |
1002 | htab_up offset_hash (htab_create_alloc (1, hash_value_and_voffset, |
1003 | eq_value_and_voffset, | |
1004 | xfree, xcalloc, xfree)); | |
59d3651b | 1005 | std::vector<value_and_voffset *> result_vec; |
c4aeac85 | 1006 | |
fc4007c9 | 1007 | compute_vtable_size (offset_hash.get (), &result_vec, value); |
59d3651b TT |
1008 | std::sort (result_vec.begin (), result_vec.end (), |
1009 | compare_value_and_voffset); | |
c4aeac85 TT |
1010 | |
1011 | count = 0; | |
59d3651b | 1012 | for (value_and_voffset *iter : result_vec) |
c4aeac85 TT |
1013 | { |
1014 | if (iter->max_voffset >= 0) | |
1015 | { | |
1016 | if (count > 0) | |
6cb06a8c | 1017 | gdb_printf ("\n"); |
c4aeac85 TT |
1018 | print_one_vtable (gdbarch, iter->value, iter->max_voffset, &opts); |
1019 | ++count; | |
1020 | } | |
1021 | } | |
c4aeac85 TT |
1022 | } |
1023 | ||
6e72ca20 TT |
1024 | /* Return a GDB type representing `struct std::type_info', laid out |
1025 | appropriately for ARCH. | |
1026 | ||
1027 | We use this function as the gdbarch per-architecture data | |
1028 | initialization function. */ | |
1029 | ||
cb275538 | 1030 | static struct type * |
6e72ca20 TT |
1031 | build_std_type_info_type (struct gdbarch *arch) |
1032 | { | |
1033 | struct type *t; | |
6e72ca20 TT |
1034 | int offset; |
1035 | struct type *void_ptr_type | |
1036 | = builtin_type (arch)->builtin_data_ptr; | |
1037 | struct type *char_type | |
1038 | = builtin_type (arch)->builtin_char; | |
1039 | struct type *char_ptr_type | |
1040 | = make_pointer_type (make_cv_type (1, 0, char_type, NULL), NULL); | |
1041 | ||
2774f2da TV |
1042 | t = type_allocator (arch).new_type (TYPE_CODE_STRUCT, 0, nullptr); |
1043 | ||
1044 | t->alloc_fields (2); | |
1045 | ||
6e72ca20 TT |
1046 | offset = 0; |
1047 | ||
1048 | /* The vtable. */ | |
2774f2da TV |
1049 | { |
1050 | struct field &field0 = t->field (0); | |
1051 | field0.set_name ("_vptr.type_info"); | |
1052 | field0.set_type (void_ptr_type); | |
1053 | field0.set_loc_bitpos (offset * TARGET_CHAR_BIT); | |
1054 | offset += field0.type ()->length (); | |
1055 | } | |
6e72ca20 TT |
1056 | |
1057 | /* The name. */ | |
2774f2da TV |
1058 | { |
1059 | struct field &field1 = t->field (1); | |
1060 | field1.set_name ("__name"); | |
1061 | field1.set_type (char_ptr_type); | |
1062 | field1.set_loc_bitpos (offset * TARGET_CHAR_BIT); | |
1063 | offset += field1.type ()->length (); | |
1064 | } | |
1065 | ||
1066 | t->set_length (offset); | |
1067 | ||
d0e39ea2 | 1068 | t->set_name ("gdb_gnu_v3_type_info"); |
6e72ca20 TT |
1069 | INIT_CPLUS_SPECIFIC (t); |
1070 | ||
1071 | return t; | |
1072 | } | |
1073 | ||
1074 | /* Implement the 'get_typeid_type' method. */ | |
1075 | ||
1076 | static struct type * | |
1077 | gnuv3_get_typeid_type (struct gdbarch *gdbarch) | |
1078 | { | |
1079 | struct symbol *typeinfo; | |
1080 | struct type *typeinfo_type; | |
1081 | ||
ccf41c24 | 1082 | typeinfo = lookup_symbol ("std::type_info", NULL, SEARCH_STRUCT_DOMAIN, |
d12307c1 | 1083 | NULL).symbol; |
6e72ca20 | 1084 | if (typeinfo == NULL) |
cb275538 TT |
1085 | { |
1086 | typeinfo_type = std_type_info_gdbarch_data.get (gdbarch); | |
1087 | if (typeinfo_type == nullptr) | |
1088 | { | |
1089 | typeinfo_type = build_std_type_info_type (gdbarch); | |
1090 | std_type_info_gdbarch_data.set (gdbarch, typeinfo_type); | |
1091 | } | |
1092 | } | |
6e72ca20 | 1093 | else |
5f9c5a63 | 1094 | typeinfo_type = typeinfo->type (); |
6e72ca20 TT |
1095 | |
1096 | return typeinfo_type; | |
1097 | } | |
1098 | ||
1099 | /* Implement the 'get_typeid' method. */ | |
1100 | ||
1101 | static struct value * | |
1102 | gnuv3_get_typeid (struct value *value) | |
1103 | { | |
1104 | struct type *typeinfo_type; | |
1105 | struct type *type; | |
1106 | struct gdbarch *gdbarch; | |
6e72ca20 | 1107 | struct value *result; |
596dc4ad TT |
1108 | std::string type_name; |
1109 | gdb::unique_xmalloc_ptr<char> canonical; | |
6e72ca20 TT |
1110 | |
1111 | /* We have to handle values a bit trickily here, to allow this code | |
1112 | to work properly with non_lvalue values that are really just | |
1113 | disguised types. */ | |
97044105 | 1114 | if (value->lval () == lval_memory) |
6e72ca20 TT |
1115 | value = coerce_ref (value); |
1116 | ||
d0c97917 | 1117 | type = check_typedef (value->type ()); |
6e72ca20 TT |
1118 | |
1119 | /* In the non_lvalue case, a reference might have slipped through | |
1120 | here. */ | |
78134374 | 1121 | if (type->code () == TYPE_CODE_REF) |
27710edb | 1122 | type = check_typedef (type->target_type ()); |
6e72ca20 TT |
1123 | |
1124 | /* Ignore top-level cv-qualifiers. */ | |
1125 | type = make_cv_type (0, 0, type, NULL); | |
8ee511af | 1126 | gdbarch = type->arch (); |
6e72ca20 | 1127 | |
fe978cb0 | 1128 | type_name = type_to_string (type); |
2f408ecb | 1129 | if (type_name.empty ()) |
6e72ca20 | 1130 | error (_("cannot find typeinfo for unnamed type")); |
6e72ca20 TT |
1131 | |
1132 | /* We need to canonicalize the type name here, because we do lookups | |
1133 | using the demangled name, and so we must match the format it | |
1134 | uses. E.g., GDB tends to use "const char *" as a type name, but | |
1135 | the demangler uses "char const *". */ | |
2f408ecb | 1136 | canonical = cp_canonicalize_string (type_name.c_str ()); |
596dc4ad TT |
1137 | const char *name = (canonical == nullptr |
1138 | ? type_name.c_str () | |
1139 | : canonical.get ()); | |
6e72ca20 TT |
1140 | |
1141 | typeinfo_type = gnuv3_get_typeid_type (gdbarch); | |
1142 | ||
1143 | /* We check for lval_memory because in the "typeid (type-id)" case, | |
1144 | the type is passed via a not_lval value object. */ | |
78134374 | 1145 | if (type->code () == TYPE_CODE_STRUCT |
97044105 | 1146 | && value->lval () == lval_memory |
6e72ca20 TT |
1147 | && gnuv3_dynamic_class (type)) |
1148 | { | |
1149 | struct value *vtable, *typeinfo_value; | |
9feb2d07 | 1150 | CORE_ADDR address = value->address () + value->embedded_offset (); |
6e72ca20 TT |
1151 | |
1152 | vtable = gnuv3_get_vtable (gdbarch, type, address); | |
1153 | if (vtable == NULL) | |
2f408ecb | 1154 | error (_("cannot find typeinfo for object of type '%s'"), |
596dc4ad | 1155 | name); |
6e72ca20 TT |
1156 | typeinfo_value = value_field (vtable, vtable_field_type_info); |
1157 | result = value_ind (value_cast (make_pointer_type (typeinfo_type, NULL), | |
1158 | typeinfo_value)); | |
1159 | } | |
1160 | else | |
1161 | { | |
596dc4ad | 1162 | std::string sym_name = std::string ("typeinfo for ") + name; |
2f408ecb PA |
1163 | bound_minimal_symbol minsym |
1164 | = lookup_minimal_symbol (sym_name.c_str (), NULL, NULL); | |
6e72ca20 | 1165 | |
3b7344d5 | 1166 | if (minsym.minsym == NULL) |
596dc4ad | 1167 | error (_("could not find typeinfo symbol for '%s'"), name); |
6e72ca20 | 1168 | |
4aeddc50 | 1169 | result = value_at_lazy (typeinfo_type, minsym.value_address ()); |
6e72ca20 TT |
1170 | } |
1171 | ||
6e72ca20 TT |
1172 | return result; |
1173 | } | |
1174 | ||
cc16e6c9 | 1175 | /* Implement the 'get_typename_from_type_info' method. */ |
72f1fe8a | 1176 | |
2f408ecb | 1177 | static std::string |
72f1fe8a TT |
1178 | gnuv3_get_typename_from_type_info (struct value *type_info_ptr) |
1179 | { | |
d0c97917 | 1180 | struct gdbarch *gdbarch = type_info_ptr->type ()->arch (); |
72f1fe8a TT |
1181 | struct bound_minimal_symbol typeinfo_sym; |
1182 | CORE_ADDR addr; | |
1183 | const char *symname; | |
1184 | const char *class_name; | |
1185 | const char *atsign; | |
1186 | ||
1187 | addr = value_as_address (type_info_ptr); | |
1188 | typeinfo_sym = lookup_minimal_symbol_by_pc (addr); | |
1189 | if (typeinfo_sym.minsym == NULL) | |
1190 | error (_("could not find minimal symbol for typeinfo address %s"), | |
1191 | paddress (gdbarch, addr)); | |
1192 | ||
1193 | #define TYPEINFO_PREFIX "typeinfo for " | |
1194 | #define TYPEINFO_PREFIX_LEN (sizeof (TYPEINFO_PREFIX) - 1) | |
c9d95fa3 | 1195 | symname = typeinfo_sym.minsym->demangled_name (); |
72f1fe8a TT |
1196 | if (symname == NULL || strncmp (symname, TYPEINFO_PREFIX, |
1197 | TYPEINFO_PREFIX_LEN)) | |
1198 | error (_("typeinfo symbol '%s' has unexpected name"), | |
c9d95fa3 | 1199 | typeinfo_sym.minsym->linkage_name ()); |
72f1fe8a TT |
1200 | class_name = symname + TYPEINFO_PREFIX_LEN; |
1201 | ||
1202 | /* Strip off @plt and version suffixes. */ | |
1203 | atsign = strchr (class_name, '@'); | |
1204 | if (atsign != NULL) | |
2f408ecb PA |
1205 | return std::string (class_name, atsign - class_name); |
1206 | return class_name; | |
72f1fe8a TT |
1207 | } |
1208 | ||
1209 | /* Implement the 'get_type_from_type_info' method. */ | |
1210 | ||
1211 | static struct type * | |
1212 | gnuv3_get_type_from_type_info (struct value *type_info_ptr) | |
1213 | { | |
72f1fe8a TT |
1214 | /* We have to parse the type name, since in general there is not a |
1215 | symbol for a type. This is somewhat bogus since there may be a | |
1216 | mis-parse. Another approach might be to re-use the demangler's | |
1217 | internal form to reconstruct the type somehow. */ | |
2f408ecb PA |
1218 | std::string type_name = gnuv3_get_typename_from_type_info (type_info_ptr); |
1219 | expression_up expr (parse_expression (type_name.c_str ())); | |
ba71385e | 1220 | struct value *type_val = expr->evaluate_type (); |
d0c97917 | 1221 | return type_val->type (); |
72f1fe8a TT |
1222 | } |
1223 | ||
b18be20d DJ |
1224 | /* Determine if we are currently in a C++ thunk. If so, get the address |
1225 | of the routine we are thunking to and continue to there instead. */ | |
1226 | ||
1227 | static CORE_ADDR | |
8480a37e | 1228 | gnuv3_skip_trampoline (const frame_info_ptr &frame, CORE_ADDR stop_pc) |
b18be20d | 1229 | { |
a513d1e8 | 1230 | CORE_ADDR real_stop_pc, method_stop_pc, func_addr; |
9970f04b | 1231 | struct gdbarch *gdbarch = get_frame_arch (frame); |
3b7344d5 | 1232 | struct bound_minimal_symbol thunk_sym, fn_sym; |
b18be20d | 1233 | struct obj_section *section; |
0d5cff50 | 1234 | const char *thunk_name, *fn_name; |
b18be20d | 1235 | |
9970f04b | 1236 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
b18be20d DJ |
1237 | if (real_stop_pc == 0) |
1238 | real_stop_pc = stop_pc; | |
1239 | ||
1240 | /* Find the linker symbol for this potential thunk. */ | |
3b7344d5 | 1241 | thunk_sym = lookup_minimal_symbol_by_pc (real_stop_pc); |
b18be20d | 1242 | section = find_pc_section (real_stop_pc); |
3b7344d5 | 1243 | if (thunk_sym.minsym == NULL || section == NULL) |
b18be20d DJ |
1244 | return 0; |
1245 | ||
1246 | /* The symbol's demangled name should be something like "virtual | |
1247 | thunk to FUNCTION", where FUNCTION is the name of the function | |
1248 | being thunked to. */ | |
c9d95fa3 | 1249 | thunk_name = thunk_sym.minsym->demangled_name (); |
b18be20d DJ |
1250 | if (thunk_name == NULL || strstr (thunk_name, " thunk to ") == NULL) |
1251 | return 0; | |
1252 | ||
1253 | fn_name = strstr (thunk_name, " thunk to ") + strlen (" thunk to "); | |
1254 | fn_sym = lookup_minimal_symbol (fn_name, NULL, section->objfile); | |
3b7344d5 | 1255 | if (fn_sym.minsym == NULL) |
b18be20d DJ |
1256 | return 0; |
1257 | ||
4aeddc50 | 1258 | method_stop_pc = fn_sym.value_address (); |
a513d1e8 LM |
1259 | |
1260 | /* Some targets have minimal symbols pointing to function descriptors | |
1261 | (powerpc 64 for example). Make sure to retrieve the address | |
1262 | of the real function from the function descriptor before passing on | |
1263 | the address to other layers of GDB. */ | |
328d42d8 SM |
1264 | func_addr = gdbarch_convert_from_func_ptr_addr |
1265 | (gdbarch, method_stop_pc, current_inferior ()->top_target ()); | |
a513d1e8 LM |
1266 | if (func_addr != 0) |
1267 | method_stop_pc = func_addr; | |
1268 | ||
e76f05fa | 1269 | real_stop_pc = gdbarch_skip_trampoline_code |
9970f04b | 1270 | (gdbarch, frame, method_stop_pc); |
b18be20d DJ |
1271 | if (real_stop_pc == 0) |
1272 | real_stop_pc = method_stop_pc; | |
1273 | ||
1274 | return real_stop_pc; | |
1275 | } | |
1276 | ||
62bf63d7 TBA |
1277 | /* A member function is in one these states. */ |
1278 | ||
1279 | enum definition_style | |
1280 | { | |
1281 | DOES_NOT_EXIST_IN_SOURCE, | |
1282 | DEFAULTED_INSIDE, | |
1283 | DEFAULTED_OUTSIDE, | |
1284 | DELETED, | |
1285 | EXPLICIT, | |
1286 | }; | |
1287 | ||
1288 | /* Return how the given field is defined. */ | |
1289 | ||
1290 | static definition_style | |
1291 | get_def_style (struct fn_field *fn, int fieldelem) | |
1292 | { | |
1293 | if (TYPE_FN_FIELD_DELETED (fn, fieldelem)) | |
1294 | return DELETED; | |
1295 | ||
1296 | if (TYPE_FN_FIELD_ARTIFICIAL (fn, fieldelem)) | |
1297 | return DOES_NOT_EXIST_IN_SOURCE; | |
1298 | ||
1299 | switch (TYPE_FN_FIELD_DEFAULTED (fn, fieldelem)) | |
1300 | { | |
1301 | case DW_DEFAULTED_no: | |
1302 | return EXPLICIT; | |
1303 | case DW_DEFAULTED_in_class: | |
1304 | return DEFAULTED_INSIDE; | |
1305 | case DW_DEFAULTED_out_of_class: | |
1306 | return DEFAULTED_OUTSIDE; | |
1307 | default: | |
1308 | break; | |
1309 | } | |
1310 | ||
1311 | return EXPLICIT; | |
1312 | } | |
1313 | ||
1314 | /* Helper functions to determine whether the given definition style | |
1315 | denotes that the definition is user-provided or implicit. | |
1316 | Being defaulted outside the class decl counts as an explicit | |
1317 | user-definition, while being defaulted inside is implicit. */ | |
1318 | ||
1319 | static bool | |
1320 | is_user_provided_def (definition_style def) | |
1321 | { | |
1322 | return def == EXPLICIT || def == DEFAULTED_OUTSIDE; | |
1323 | } | |
1324 | ||
1325 | static bool | |
1326 | is_implicit_def (definition_style def) | |
1327 | { | |
1328 | return def == DOES_NOT_EXIST_IN_SOURCE || def == DEFAULTED_INSIDE; | |
1329 | } | |
1330 | ||
1331 | /* Helper function to decide if METHOD_TYPE is a copy/move | |
1332 | constructor type for CLASS_TYPE. EXPECTED is the expected | |
1333 | type code for the "right-hand-side" argument. | |
1334 | This function is supposed to be used by the IS_COPY_CONSTRUCTOR_TYPE | |
1335 | and IS_MOVE_CONSTRUCTOR_TYPE functions below. Normally, you should | |
1336 | not need to call this directly. */ | |
1337 | ||
1338 | static bool | |
1339 | is_copy_or_move_constructor_type (struct type *class_type, | |
1340 | struct type *method_type, | |
1341 | type_code expected) | |
1342 | { | |
1343 | /* The method should take at least two arguments... */ | |
1f704f76 | 1344 | if (method_type->num_fields () < 2) |
62bf63d7 TBA |
1345 | return false; |
1346 | ||
1347 | /* ...and the second argument should be the same as the class | |
1348 | type, with the expected type code... */ | |
940da03e | 1349 | struct type *arg_type = method_type->field (1).type (); |
62bf63d7 | 1350 | |
78134374 | 1351 | if (arg_type->code () != expected) |
62bf63d7 TBA |
1352 | return false; |
1353 | ||
27710edb | 1354 | struct type *target = check_typedef (arg_type->target_type ()); |
62bf63d7 TBA |
1355 | if (!(class_types_same_p (target, class_type))) |
1356 | return false; | |
1357 | ||
1358 | /* ...and if any of the remaining arguments don't have a default value | |
1359 | then this is not a copy or move constructor, but just a | |
1360 | constructor. */ | |
1f704f76 | 1361 | for (int i = 2; i < method_type->num_fields (); i++) |
62bf63d7 | 1362 | { |
940da03e | 1363 | arg_type = method_type->field (i).type (); |
62bf63d7 TBA |
1364 | /* FIXME aktemur/2019-10-31: As of this date, neither |
1365 | clang++-7.0.0 nor g++-8.2.0 produce a DW_AT_default_value | |
1366 | attribute. GDB is also not set to read this attribute, yet. | |
1367 | Hence, we immediately return false if there are more than | |
1368 | 2 parameters. | |
1369 | GCC bug link: | |
1370 | https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42959 | |
1371 | */ | |
1372 | return false; | |
1373 | } | |
1374 | ||
1375 | return true; | |
1376 | } | |
1377 | ||
1378 | /* Return true if METHOD_TYPE is a copy ctor type for CLASS_TYPE. */ | |
1379 | ||
1380 | static bool | |
1381 | is_copy_constructor_type (struct type *class_type, | |
1382 | struct type *method_type) | |
1383 | { | |
1384 | return is_copy_or_move_constructor_type (class_type, method_type, | |
1385 | TYPE_CODE_REF); | |
1386 | } | |
1387 | ||
1388 | /* Return true if METHOD_TYPE is a move ctor type for CLASS_TYPE. */ | |
1389 | ||
1390 | static bool | |
1391 | is_move_constructor_type (struct type *class_type, | |
1392 | struct type *method_type) | |
1393 | { | |
1394 | return is_copy_or_move_constructor_type (class_type, method_type, | |
1395 | TYPE_CODE_RVALUE_REF); | |
1396 | } | |
1397 | ||
9d084466 | 1398 | /* Return pass-by-reference information for the given TYPE. |
41f1b697 DJ |
1399 | |
1400 | The rule in the v3 ABI document comes from section 3.1.1. If the | |
1401 | type has a non-trivial copy constructor or destructor, then the | |
1402 | caller must make a copy (by calling the copy constructor if there | |
1403 | is one or perform the copy itself otherwise), pass the address of | |
1404 | the copy, and then destroy the temporary (if necessary). | |
1405 | ||
62bf63d7 | 1406 | For return values with non-trivial copy/move constructors or |
41f1b697 DJ |
1407 | destructors, space will be allocated in the caller, and a pointer |
1408 | will be passed as the first argument (preceding "this"). | |
1409 | ||
1410 | We don't have a bulletproof mechanism for determining whether a | |
62bf63d7 TBA |
1411 | constructor or destructor is trivial. For GCC and DWARF5 debug |
1412 | information, we can check the calling_convention attribute, | |
1413 | the 'artificial' flag, the 'defaulted' attribute, and the | |
1414 | 'deleted' attribute. */ | |
9d084466 TBA |
1415 | |
1416 | static struct language_pass_by_ref_info | |
41f1b697 DJ |
1417 | gnuv3_pass_by_reference (struct type *type) |
1418 | { | |
1419 | int fieldnum, fieldelem; | |
1420 | ||
f168693b | 1421 | type = check_typedef (type); |
41f1b697 | 1422 | |
9d084466 | 1423 | /* Start with the default values. */ |
48448202 | 1424 | struct language_pass_by_ref_info info; |
9d084466 | 1425 | |
62bf63d7 TBA |
1426 | bool has_cc_attr = false; |
1427 | bool is_pass_by_value = false; | |
1428 | bool is_dynamic = false; | |
1429 | definition_style cctor_def = DOES_NOT_EXIST_IN_SOURCE; | |
1430 | definition_style dtor_def = DOES_NOT_EXIST_IN_SOURCE; | |
1431 | definition_style mctor_def = DOES_NOT_EXIST_IN_SOURCE; | |
9d084466 | 1432 | |
41f1b697 | 1433 | /* We're only interested in things that can have methods. */ |
78134374 SM |
1434 | if (type->code () != TYPE_CODE_STRUCT |
1435 | && type->code () != TYPE_CODE_UNION) | |
9d084466 | 1436 | return info; |
41f1b697 | 1437 | |
62bf63d7 TBA |
1438 | /* The compiler may have emitted the calling convention attribute. |
1439 | Note: GCC does not produce this attribute as of version 9.2.1. | |
1440 | Bug link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92418 */ | |
1441 | if (TYPE_CPLUS_CALLING_CONVENTION (type) == DW_CC_pass_by_value) | |
1442 | { | |
1443 | has_cc_attr = true; | |
1444 | is_pass_by_value = true; | |
1445 | /* Do not return immediately. We have to find out if this type | |
1446 | is copy_constructible and destructible. */ | |
1447 | } | |
1448 | ||
1449 | if (TYPE_CPLUS_CALLING_CONVENTION (type) == DW_CC_pass_by_reference) | |
1450 | { | |
1451 | has_cc_attr = true; | |
1452 | is_pass_by_value = false; | |
1453 | } | |
1454 | ||
ebb8ece2 SC |
1455 | /* A dynamic class has a non-trivial copy constructor. |
1456 | See c++98 section 12.8 Copying class objects [class.copy]. */ | |
1457 | if (gnuv3_dynamic_class (type)) | |
62bf63d7 | 1458 | is_dynamic = true; |
ebb8ece2 | 1459 | |
41f1b697 DJ |
1460 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) |
1461 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
1462 | fieldelem++) | |
1463 | { | |
1464 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
0d5cff50 | 1465 | const char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum); |
41f1b697 DJ |
1466 | struct type *fieldtype = TYPE_FN_FIELD_TYPE (fn, fieldelem); |
1467 | ||
41f1b697 | 1468 | if (name[0] == '~') |
9d084466 | 1469 | { |
62bf63d7 TBA |
1470 | /* We've found a destructor. |
1471 | There should be at most one dtor definition. */ | |
1472 | gdb_assert (dtor_def == DOES_NOT_EXIST_IN_SOURCE); | |
1473 | dtor_def = get_def_style (fn, fieldelem); | |
9d084466 | 1474 | } |
62bf63d7 TBA |
1475 | else if (is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem)) |
1476 | || TYPE_FN_FIELD_CONSTRUCTOR (fn, fieldelem)) | |
82c48ac7 | 1477 | { |
62bf63d7 TBA |
1478 | /* FIXME drow/2007-09-23: We could do this using the name of |
1479 | the method and the name of the class instead of dealing | |
1480 | with the mangled name. We don't have a convenient function | |
1481 | to strip off both leading scope qualifiers and trailing | |
1482 | template arguments yet. */ | |
1483 | if (is_copy_constructor_type (type, fieldtype)) | |
1484 | { | |
1485 | /* There may be more than one cctors. E.g.: one that | |
1486 | take a const parameter and another that takes a | |
1487 | non-const parameter. Such as: | |
1488 | ||
1489 | class K { | |
1490 | K (const K &k)... | |
1491 | K (K &k)... | |
1492 | }; | |
1493 | ||
1494 | It is sufficient for the type to be non-trivial | |
1495 | even only one of the cctors is explicit. | |
1496 | Therefore, update the cctor_def value in the | |
1497 | implicit -> explicit direction, not backwards. */ | |
1498 | ||
1499 | if (is_implicit_def (cctor_def)) | |
1500 | cctor_def = get_def_style (fn, fieldelem); | |
1501 | } | |
1502 | else if (is_move_constructor_type (type, fieldtype)) | |
3433cfa5 | 1503 | { |
62bf63d7 TBA |
1504 | /* Again, there may be multiple move ctors. Update the |
1505 | mctor_def value if we found an explicit def and the | |
1506 | existing one is not explicit. Otherwise retain the | |
1507 | existing value. */ | |
1508 | if (is_implicit_def (mctor_def)) | |
1509 | mctor_def = get_def_style (fn, fieldelem); | |
3433cfa5 | 1510 | } |
82c48ac7 | 1511 | } |
41f1b697 DJ |
1512 | } |
1513 | ||
62bf63d7 TBA |
1514 | bool cctor_implicitly_deleted |
1515 | = (mctor_def != DOES_NOT_EXIST_IN_SOURCE | |
1516 | && cctor_def == DOES_NOT_EXIST_IN_SOURCE); | |
1517 | ||
1518 | bool cctor_explicitly_deleted = (cctor_def == DELETED); | |
1519 | ||
1520 | if (cctor_implicitly_deleted || cctor_explicitly_deleted) | |
1521 | info.copy_constructible = false; | |
1522 | ||
1523 | if (dtor_def == DELETED) | |
1524 | info.destructible = false; | |
1525 | ||
1526 | info.trivially_destructible = is_implicit_def (dtor_def); | |
1527 | ||
1528 | info.trivially_copy_constructible | |
1529 | = (is_implicit_def (cctor_def) | |
1530 | && !is_dynamic); | |
1531 | ||
1532 | info.trivially_copyable | |
1533 | = (info.trivially_copy_constructible | |
1534 | && info.trivially_destructible | |
1535 | && !is_user_provided_def (mctor_def)); | |
1536 | ||
41f1b697 DJ |
1537 | /* Even if all the constructors and destructors were artificial, one |
1538 | of them may have invoked a non-artificial constructor or | |
1539 | destructor in a base class. If any base class needs to be passed | |
1540 | by reference, so does this class. Similarly for members, which | |
1541 | are constructed whenever this class is. We do not need to worry | |
1542 | about recursive loops here, since we are only looking at members | |
bceffbf3 | 1543 | of complete class type. Also ignore any static members. */ |
1f704f76 | 1544 | for (fieldnum = 0; fieldnum < type->num_fields (); fieldnum++) |
c819a338 | 1545 | if (!type->field (fieldnum).is_static ()) |
9d084466 | 1546 | { |
940da03e | 1547 | struct type *field_type = type->field (fieldnum).type (); |
62bf63d7 TBA |
1548 | |
1549 | /* For arrays, make the decision based on the element type. */ | |
78134374 | 1550 | if (field_type->code () == TYPE_CODE_ARRAY) |
27710edb | 1551 | field_type = check_typedef (field_type->target_type ()); |
62bf63d7 | 1552 | |
9d084466 | 1553 | struct language_pass_by_ref_info field_info |
62bf63d7 TBA |
1554 | = gnuv3_pass_by_reference (field_type); |
1555 | ||
1556 | if (!field_info.copy_constructible) | |
1557 | info.copy_constructible = false; | |
1558 | if (!field_info.destructible) | |
1559 | info.destructible = false; | |
9d084466 | 1560 | if (!field_info.trivially_copyable) |
62bf63d7 TBA |
1561 | info.trivially_copyable = false; |
1562 | if (!field_info.trivially_copy_constructible) | |
1563 | info.trivially_copy_constructible = false; | |
1564 | if (!field_info.trivially_destructible) | |
1565 | info.trivially_destructible = false; | |
9d084466 | 1566 | } |
41f1b697 | 1567 | |
62bf63d7 TBA |
1568 | /* Consistency check. */ |
1569 | if (has_cc_attr && info.trivially_copyable != is_pass_by_value) | |
1570 | { | |
1571 | /* DWARF CC attribute is not the same as the inferred value; | |
1572 | use the DWARF attribute. */ | |
1573 | info.trivially_copyable = is_pass_by_value; | |
1574 | } | |
1575 | ||
9d084466 | 1576 | return info; |
41f1b697 DJ |
1577 | } |
1578 | ||
7ed49443 JB |
1579 | static void |
1580 | init_gnuv3_ops (void) | |
1581 | { | |
7ed49443 JB |
1582 | gnu_v3_abi_ops.shortname = "gnu-v3"; |
1583 | gnu_v3_abi_ops.longname = "GNU G++ Version 3 ABI"; | |
1584 | gnu_v3_abi_ops.doc = "G++ Version 3 ABI"; | |
358777b0 EZ |
1585 | gnu_v3_abi_ops.is_destructor_name = |
1586 | (enum dtor_kinds (*) (const char *))is_gnu_v3_mangled_dtor; | |
1587 | gnu_v3_abi_ops.is_constructor_name = | |
1588 | (enum ctor_kinds (*) (const char *))is_gnu_v3_mangled_ctor; | |
7ed49443 JB |
1589 | gnu_v3_abi_ops.is_vtable_name = gnuv3_is_vtable_name; |
1590 | gnu_v3_abi_ops.is_operator_name = gnuv3_is_operator_name; | |
1591 | gnu_v3_abi_ops.rtti_type = gnuv3_rtti_type; | |
1592 | gnu_v3_abi_ops.virtual_fn_field = gnuv3_virtual_fn_field; | |
1514d34e | 1593 | gnu_v3_abi_ops.baseclass_offset = gnuv3_baseclass_offset; |
0d5de010 DJ |
1594 | gnu_v3_abi_ops.print_method_ptr = gnuv3_print_method_ptr; |
1595 | gnu_v3_abi_ops.method_ptr_size = gnuv3_method_ptr_size; | |
1596 | gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr; | |
1597 | gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value; | |
c4aeac85 | 1598 | gnu_v3_abi_ops.print_vtable = gnuv3_print_vtable; |
6e72ca20 TT |
1599 | gnu_v3_abi_ops.get_typeid = gnuv3_get_typeid; |
1600 | gnu_v3_abi_ops.get_typeid_type = gnuv3_get_typeid_type; | |
72f1fe8a | 1601 | gnu_v3_abi_ops.get_type_from_type_info = gnuv3_get_type_from_type_info; |
cc16e6c9 TT |
1602 | gnu_v3_abi_ops.get_typename_from_type_info |
1603 | = gnuv3_get_typename_from_type_info; | |
b18be20d | 1604 | gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline; |
41f1b697 | 1605 | gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference; |
7ed49443 JB |
1606 | } |
1607 | ||
6c265988 | 1608 | void _initialize_gnu_v3_abi (); |
7ed49443 | 1609 | void |
6c265988 | 1610 | _initialize_gnu_v3_abi () |
7ed49443 JB |
1611 | { |
1612 | init_gnuv3_ops (); | |
1613 | ||
fe1f4a5e | 1614 | register_cp_abi (&gnu_v3_abi_ops); |
1605ef26 | 1615 | set_cp_abi_as_auto_default (gnu_v3_abi_ops.shortname); |
7ed49443 | 1616 | } |