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7ed49443 JB |
1 | /* Abstraction of GNU v3 abi. |
2 | Contributed by Jim Blandy <jimb@redhat.com> | |
451fbdda | 3 | |
0b302171 | 4 | Copyright (C) 2001-2003, 2005-2012 Free Software Foundation, Inc. |
7ed49443 JB |
5 | |
6 | This file is part of GDB. | |
7 | ||
a9762ec7 JB |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
7ed49443 JB |
12 | |
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
7ed49443 JB |
20 | |
21 | #include "defs.h" | |
22 | #include "value.h" | |
23 | #include "cp-abi.h" | |
362ff856 | 24 | #include "cp-support.h" |
7ed49443 | 25 | #include "demangle.h" |
b18be20d | 26 | #include "objfiles.h" |
0d5de010 | 27 | #include "valprint.h" |
94af9270 | 28 | #include "c-lang.h" |
c4aeac85 | 29 | #include "exceptions.h" |
0d5de010 | 30 | |
3d499020 | 31 | #include "gdb_assert.h" |
5f8a3188 | 32 | #include "gdb_string.h" |
7ed49443 | 33 | |
b27b8843 | 34 | static struct cp_abi_ops gnu_v3_abi_ops; |
7ed49443 JB |
35 | |
36 | static int | |
37 | gnuv3_is_vtable_name (const char *name) | |
38 | { | |
39 | return strncmp (name, "_ZTV", 4) == 0; | |
40 | } | |
41 | ||
42 | static int | |
43 | gnuv3_is_operator_name (const char *name) | |
44 | { | |
45 | return strncmp (name, "operator", 8) == 0; | |
46 | } | |
47 | ||
48 | ||
49 | /* To help us find the components of a vtable, we build ourselves a | |
50 | GDB type object representing the vtable structure. Following the | |
51 | V3 ABI, it goes something like this: | |
52 | ||
53 | struct gdb_gnu_v3_abi_vtable { | |
54 | ||
55 | / * An array of virtual call and virtual base offsets. The real | |
56 | length of this array depends on the class hierarchy; we use | |
57 | negative subscripts to access the elements. Yucky, but | |
58 | better than the alternatives. * / | |
59 | ptrdiff_t vcall_and_vbase_offsets[0]; | |
60 | ||
61 | / * The offset from a virtual pointer referring to this table | |
62 | to the top of the complete object. * / | |
63 | ptrdiff_t offset_to_top; | |
64 | ||
65 | / * The type_info pointer for this class. This is really a | |
66 | std::type_info *, but GDB doesn't really look at the | |
67 | type_info object itself, so we don't bother to get the type | |
68 | exactly right. * / | |
69 | void *type_info; | |
70 | ||
71 | / * Virtual table pointers in objects point here. * / | |
72 | ||
73 | / * Virtual function pointers. Like the vcall/vbase array, the | |
74 | real length of this table depends on the class hierarchy. * / | |
75 | void (*virtual_functions[0]) (); | |
76 | ||
77 | }; | |
78 | ||
79 | The catch, of course, is that the exact layout of this table | |
80 | depends on the ABI --- word size, endianness, alignment, etc. So | |
81 | the GDB type object is actually a per-architecture kind of thing. | |
82 | ||
83 | vtable_type_gdbarch_data is a gdbarch per-architecture data pointer | |
84 | which refers to the struct type * for this structure, laid out | |
85 | appropriately for the architecture. */ | |
b27b8843 | 86 | static struct gdbarch_data *vtable_type_gdbarch_data; |
7ed49443 JB |
87 | |
88 | ||
89 | /* Human-readable names for the numbers of the fields above. */ | |
90 | enum { | |
91 | vtable_field_vcall_and_vbase_offsets, | |
92 | vtable_field_offset_to_top, | |
93 | vtable_field_type_info, | |
94 | vtable_field_virtual_functions | |
95 | }; | |
96 | ||
97 | ||
98 | /* Return a GDB type representing `struct gdb_gnu_v3_abi_vtable', | |
99 | described above, laid out appropriately for ARCH. | |
100 | ||
101 | We use this function as the gdbarch per-architecture data | |
9970f04b | 102 | initialization function. */ |
7ed49443 JB |
103 | static void * |
104 | build_gdb_vtable_type (struct gdbarch *arch) | |
105 | { | |
106 | struct type *t; | |
107 | struct field *field_list, *field; | |
108 | int offset; | |
109 | ||
110 | struct type *void_ptr_type | |
fde6c819 | 111 | = builtin_type (arch)->builtin_data_ptr; |
7ed49443 | 112 | struct type *ptr_to_void_fn_type |
fde6c819 | 113 | = builtin_type (arch)->builtin_func_ptr; |
7ed49443 JB |
114 | |
115 | /* ARCH can't give us the true ptrdiff_t type, so we guess. */ | |
116 | struct type *ptrdiff_type | |
e9bb382b | 117 | = arch_integer_type (arch, gdbarch_ptr_bit (arch), 0, "ptrdiff_t"); |
7ed49443 JB |
118 | |
119 | /* We assume no padding is necessary, since GDB doesn't know | |
120 | anything about alignment at the moment. If this assumption bites | |
121 | us, we should add a gdbarch method which, given a type, returns | |
122 | the alignment that type requires, and then use that here. */ | |
123 | ||
124 | /* Build the field list. */ | |
125 | field_list = xmalloc (sizeof (struct field [4])); | |
126 | memset (field_list, 0, sizeof (struct field [4])); | |
127 | field = &field_list[0]; | |
128 | offset = 0; | |
129 | ||
130 | /* ptrdiff_t vcall_and_vbase_offsets[0]; */ | |
131 | FIELD_NAME (*field) = "vcall_and_vbase_offsets"; | |
e3506a9f | 132 | FIELD_TYPE (*field) = lookup_array_range_type (ptrdiff_type, 0, -1); |
7ed49443 JB |
133 | FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT; |
134 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); | |
135 | field++; | |
136 | ||
137 | /* ptrdiff_t offset_to_top; */ | |
138 | FIELD_NAME (*field) = "offset_to_top"; | |
139 | FIELD_TYPE (*field) = ptrdiff_type; | |
140 | FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT; | |
141 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); | |
142 | field++; | |
143 | ||
144 | /* void *type_info; */ | |
145 | FIELD_NAME (*field) = "type_info"; | |
146 | FIELD_TYPE (*field) = void_ptr_type; | |
147 | FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT; | |
148 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); | |
149 | field++; | |
150 | ||
151 | /* void (*virtual_functions[0]) (); */ | |
152 | FIELD_NAME (*field) = "virtual_functions"; | |
e3506a9f | 153 | FIELD_TYPE (*field) = lookup_array_range_type (ptr_to_void_fn_type, 0, -1); |
7ed49443 JB |
154 | FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT; |
155 | offset += TYPE_LENGTH (FIELD_TYPE (*field)); | |
156 | field++; | |
157 | ||
158 | /* We assumed in the allocation above that there were four fields. */ | |
3d499020 | 159 | gdb_assert (field == (field_list + 4)); |
7ed49443 | 160 | |
e9bb382b | 161 | t = arch_type (arch, TYPE_CODE_STRUCT, offset, NULL); |
7ed49443 JB |
162 | TYPE_NFIELDS (t) = field - field_list; |
163 | TYPE_FIELDS (t) = field_list; | |
164 | TYPE_TAG_NAME (t) = "gdb_gnu_v3_abi_vtable"; | |
e9bb382b | 165 | INIT_CPLUS_SPECIFIC (t); |
7ed49443 JB |
166 | |
167 | return t; | |
168 | } | |
169 | ||
170 | ||
ed09d7da KB |
171 | /* Return the ptrdiff_t type used in the vtable type. */ |
172 | static struct type * | |
173 | vtable_ptrdiff_type (struct gdbarch *gdbarch) | |
174 | { | |
175 | struct type *vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data); | |
176 | ||
177 | /* The "offset_to_top" field has the appropriate (ptrdiff_t) type. */ | |
178 | return TYPE_FIELD_TYPE (vtable_type, vtable_field_offset_to_top); | |
179 | } | |
180 | ||
7ed49443 JB |
181 | /* Return the offset from the start of the imaginary `struct |
182 | gdb_gnu_v3_abi_vtable' object to the vtable's "address point" | |
183 | (i.e., where objects' virtual table pointers point). */ | |
184 | static int | |
ad4820ab | 185 | vtable_address_point_offset (struct gdbarch *gdbarch) |
7ed49443 | 186 | { |
ad4820ab | 187 | struct type *vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data); |
7ed49443 JB |
188 | |
189 | return (TYPE_FIELD_BITPOS (vtable_type, vtable_field_virtual_functions) | |
190 | / TARGET_CHAR_BIT); | |
191 | } | |
192 | ||
193 | ||
d48cc9dd DJ |
194 | /* Determine whether structure TYPE is a dynamic class. Cache the |
195 | result. */ | |
196 | ||
197 | static int | |
198 | gnuv3_dynamic_class (struct type *type) | |
199 | { | |
200 | int fieldnum, fieldelem; | |
201 | ||
202 | if (TYPE_CPLUS_DYNAMIC (type)) | |
203 | return TYPE_CPLUS_DYNAMIC (type) == 1; | |
204 | ||
205 | ALLOCATE_CPLUS_STRUCT_TYPE (type); | |
206 | ||
207 | for (fieldnum = 0; fieldnum < TYPE_N_BASECLASSES (type); fieldnum++) | |
208 | if (BASETYPE_VIA_VIRTUAL (type, fieldnum) | |
209 | || gnuv3_dynamic_class (TYPE_FIELD_TYPE (type, fieldnum))) | |
210 | { | |
211 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
212 | return 1; | |
213 | } | |
214 | ||
215 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) | |
216 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
217 | fieldelem++) | |
218 | { | |
219 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
220 | ||
221 | if (TYPE_FN_FIELD_VIRTUAL_P (f, fieldelem)) | |
222 | { | |
223 | TYPE_CPLUS_DYNAMIC (type) = 1; | |
224 | return 1; | |
225 | } | |
226 | } | |
227 | ||
228 | TYPE_CPLUS_DYNAMIC (type) = -1; | |
229 | return 0; | |
230 | } | |
231 | ||
232 | /* Find the vtable for a value of CONTAINER_TYPE located at | |
233 | CONTAINER_ADDR. Return a value of the correct vtable type for this | |
234 | architecture, or NULL if CONTAINER does not have a vtable. */ | |
235 | ||
236 | static struct value * | |
237 | gnuv3_get_vtable (struct gdbarch *gdbarch, | |
238 | struct type *container_type, CORE_ADDR container_addr) | |
239 | { | |
240 | struct type *vtable_type = gdbarch_data (gdbarch, | |
241 | vtable_type_gdbarch_data); | |
242 | struct type *vtable_pointer_type; | |
243 | struct value *vtable_pointer; | |
244 | CORE_ADDR vtable_address; | |
245 | ||
246 | /* If this type does not have a virtual table, don't read the first | |
247 | field. */ | |
248 | if (!gnuv3_dynamic_class (check_typedef (container_type))) | |
249 | return NULL; | |
250 | ||
251 | /* We do not consult the debug information to find the virtual table. | |
252 | The ABI specifies that it is always at offset zero in any class, | |
253 | and debug information may not represent it. | |
254 | ||
255 | We avoid using value_contents on principle, because the object might | |
256 | be large. */ | |
257 | ||
258 | /* Find the type "pointer to virtual table". */ | |
259 | vtable_pointer_type = lookup_pointer_type (vtable_type); | |
260 | ||
261 | /* Load it from the start of the class. */ | |
262 | vtable_pointer = value_at (vtable_pointer_type, container_addr); | |
263 | vtable_address = value_as_address (vtable_pointer); | |
264 | ||
265 | /* Correct it to point at the start of the virtual table, rather | |
266 | than the address point. */ | |
267 | return value_at_lazy (vtable_type, | |
0963b4bd MS |
268 | vtable_address |
269 | - vtable_address_point_offset (gdbarch)); | |
d48cc9dd DJ |
270 | } |
271 | ||
272 | ||
7ed49443 JB |
273 | static struct type * |
274 | gnuv3_rtti_type (struct value *value, | |
275 | int *full_p, int *top_p, int *using_enc_p) | |
276 | { | |
ad4820ab | 277 | struct gdbarch *gdbarch; |
df407dfe | 278 | struct type *values_type = check_typedef (value_type (value)); |
7ed49443 JB |
279 | struct value *vtable; |
280 | struct minimal_symbol *vtable_symbol; | |
281 | const char *vtable_symbol_name; | |
282 | const char *class_name; | |
7ed49443 JB |
283 | struct type *run_time_type; |
284 | LONGEST offset_to_top; | |
285 | ||
286 | /* We only have RTTI for class objects. */ | |
df407dfe | 287 | if (TYPE_CODE (values_type) != TYPE_CODE_CLASS) |
7ed49443 JB |
288 | return NULL; |
289 | ||
eb2a6f42 TT |
290 | /* Java doesn't have RTTI following the C++ ABI. */ |
291 | if (TYPE_CPLUS_REALLY_JAVA (values_type)) | |
292 | return NULL; | |
293 | ||
ad4820ab | 294 | /* Determine architecture. */ |
50810684 | 295 | gdbarch = get_type_arch (values_type); |
7ed49443 | 296 | |
21cfb3b6 DJ |
297 | if (using_enc_p) |
298 | *using_enc_p = 0; | |
299 | ||
d48cc9dd DJ |
300 | vtable = gnuv3_get_vtable (gdbarch, value_type (value), |
301 | value_as_address (value_addr (value))); | |
302 | if (vtable == NULL) | |
303 | return NULL; | |
304 | ||
7ed49443 JB |
305 | /* Find the linker symbol for this vtable. */ |
306 | vtable_symbol | |
42ae5230 | 307 | = lookup_minimal_symbol_by_pc (value_address (vtable) |
13c3b5f5 | 308 | + value_embedded_offset (vtable)); |
7ed49443 JB |
309 | if (! vtable_symbol) |
310 | return NULL; | |
311 | ||
312 | /* The symbol's demangled name should be something like "vtable for | |
313 | CLASS", where CLASS is the name of the run-time type of VALUE. | |
314 | If we didn't like this approach, we could instead look in the | |
315 | type_info object itself to get the class name. But this way | |
316 | should work just as well, and doesn't read target memory. */ | |
317 | vtable_symbol_name = SYMBOL_DEMANGLED_NAME (vtable_symbol); | |
98081e55 PB |
318 | if (vtable_symbol_name == NULL |
319 | || strncmp (vtable_symbol_name, "vtable for ", 11)) | |
f773fdbb | 320 | { |
8a3fe4f8 | 321 | warning (_("can't find linker symbol for virtual table for `%s' value"), |
0a07729b | 322 | TYPE_SAFE_NAME (values_type)); |
f773fdbb | 323 | if (vtable_symbol_name) |
8a3fe4f8 | 324 | warning (_(" found `%s' instead"), vtable_symbol_name); |
f773fdbb JM |
325 | return NULL; |
326 | } | |
7ed49443 JB |
327 | class_name = vtable_symbol_name + 11; |
328 | ||
329 | /* Try to look up the class name as a type name. */ | |
0963b4bd | 330 | /* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */ |
362ff856 MC |
331 | run_time_type = cp_lookup_rtti_type (class_name, NULL); |
332 | if (run_time_type == NULL) | |
333 | return NULL; | |
7ed49443 JB |
334 | |
335 | /* Get the offset from VALUE to the top of the complete object. | |
336 | NOTE: this is the reverse of the meaning of *TOP_P. */ | |
337 | offset_to_top | |
338 | = value_as_long (value_field (vtable, vtable_field_offset_to_top)); | |
339 | ||
340 | if (full_p) | |
13c3b5f5 | 341 | *full_p = (- offset_to_top == value_embedded_offset (value) |
4754a64e | 342 | && (TYPE_LENGTH (value_enclosing_type (value)) |
7ed49443 JB |
343 | >= TYPE_LENGTH (run_time_type))); |
344 | if (top_p) | |
345 | *top_p = - offset_to_top; | |
7ed49443 JB |
346 | return run_time_type; |
347 | } | |
348 | ||
0d5de010 DJ |
349 | /* Return a function pointer for CONTAINER's VTABLE_INDEX'th virtual |
350 | function, of type FNTYPE. */ | |
7ed49443 | 351 | |
0d5de010 | 352 | static struct value * |
ad4820ab UW |
353 | gnuv3_get_virtual_fn (struct gdbarch *gdbarch, struct value *container, |
354 | struct type *fntype, int vtable_index) | |
0d5de010 | 355 | { |
d48cc9dd DJ |
356 | struct value *vtable, *vfn; |
357 | ||
358 | /* Every class with virtual functions must have a vtable. */ | |
359 | vtable = gnuv3_get_vtable (gdbarch, value_type (container), | |
360 | value_as_address (value_addr (container))); | |
361 | gdb_assert (vtable != NULL); | |
7ed49443 JB |
362 | |
363 | /* Fetch the appropriate function pointer from the vtable. */ | |
364 | vfn = value_subscript (value_field (vtable, vtable_field_virtual_functions), | |
2497b498 | 365 | vtable_index); |
7ed49443 | 366 | |
0d5de010 DJ |
367 | /* If this architecture uses function descriptors directly in the vtable, |
368 | then the address of the vtable entry is actually a "function pointer" | |
369 | (i.e. points to the descriptor). We don't need to scale the index | |
370 | by the size of a function descriptor; GCC does that before outputing | |
371 | debug information. */ | |
ad4820ab | 372 | if (gdbarch_vtable_function_descriptors (gdbarch)) |
0d5de010 | 373 | vfn = value_addr (vfn); |
7ed49443 | 374 | |
0d5de010 DJ |
375 | /* Cast the function pointer to the appropriate type. */ |
376 | vfn = value_cast (lookup_pointer_type (fntype), vfn); | |
76b79d6e | 377 | |
7ed49443 JB |
378 | return vfn; |
379 | } | |
380 | ||
0d5de010 DJ |
381 | /* GNU v3 implementation of value_virtual_fn_field. See cp-abi.h |
382 | for a description of the arguments. */ | |
383 | ||
384 | static struct value * | |
385 | gnuv3_virtual_fn_field (struct value **value_p, | |
386 | struct fn_field *f, int j, | |
387 | struct type *vfn_base, int offset) | |
388 | { | |
389 | struct type *values_type = check_typedef (value_type (*value_p)); | |
ad4820ab | 390 | struct gdbarch *gdbarch; |
0d5de010 DJ |
391 | |
392 | /* Some simple sanity checks. */ | |
393 | if (TYPE_CODE (values_type) != TYPE_CODE_CLASS) | |
394 | error (_("Only classes can have virtual functions.")); | |
395 | ||
ad4820ab | 396 | /* Determine architecture. */ |
50810684 | 397 | gdbarch = get_type_arch (values_type); |
ad4820ab | 398 | |
0d5de010 DJ |
399 | /* Cast our value to the base class which defines this virtual |
400 | function. This takes care of any necessary `this' | |
401 | adjustments. */ | |
402 | if (vfn_base != values_type) | |
403 | *value_p = value_cast (vfn_base, *value_p); | |
404 | ||
ad4820ab | 405 | return gnuv3_get_virtual_fn (gdbarch, *value_p, TYPE_FN_FIELD_TYPE (f, j), |
0d5de010 DJ |
406 | TYPE_FN_FIELD_VOFFSET (f, j)); |
407 | } | |
408 | ||
1514d34e DJ |
409 | /* Compute the offset of the baseclass which is |
410 | the INDEXth baseclass of class TYPE, | |
411 | for value at VALADDR (in host) at ADDRESS (in target). | |
412 | The result is the offset of the baseclass value relative | |
413 | to (the address of)(ARG) + OFFSET. | |
414 | ||
0963b4bd MS |
415 | -1 is returned on error. */ |
416 | ||
b9362cc7 | 417 | static int |
8af8e3bc PA |
418 | gnuv3_baseclass_offset (struct type *type, int index, |
419 | const bfd_byte *valaddr, int embedded_offset, | |
420 | CORE_ADDR address, const struct value *val) | |
1514d34e | 421 | { |
ad4820ab | 422 | struct gdbarch *gdbarch; |
ad4820ab | 423 | struct type *ptr_type; |
79d5b63a | 424 | struct value *vtable; |
2497b498 | 425 | struct value *vbase_array; |
1514d34e | 426 | long int cur_base_offset, base_offset; |
1514d34e | 427 | |
ad4820ab | 428 | /* Determine architecture. */ |
50810684 | 429 | gdbarch = get_type_arch (type); |
ad4820ab UW |
430 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
431 | ||
1514d34e DJ |
432 | /* If it isn't a virtual base, this is easy. The offset is in the |
433 | type definition. */ | |
434 | if (!BASETYPE_VIA_VIRTUAL (type, index)) | |
435 | return TYPE_BASECLASS_BITPOS (type, index) / 8; | |
436 | ||
437 | /* To access a virtual base, we need to use the vbase offset stored in | |
438 | our vtable. Recent GCC versions provide this information. If it isn't | |
439 | available, we could get what we needed from RTTI, or from drawing the | |
440 | complete inheritance graph based on the debug info. Neither is | |
441 | worthwhile. */ | |
442 | cur_base_offset = TYPE_BASECLASS_BITPOS (type, index) / 8; | |
ad4820ab | 443 | if (cur_base_offset >= - vtable_address_point_offset (gdbarch)) |
8a3fe4f8 | 444 | error (_("Expected a negative vbase offset (old compiler?)")); |
1514d34e | 445 | |
ad4820ab UW |
446 | cur_base_offset = cur_base_offset + vtable_address_point_offset (gdbarch); |
447 | if ((- cur_base_offset) % TYPE_LENGTH (ptr_type) != 0) | |
8a3fe4f8 | 448 | error (_("Misaligned vbase offset.")); |
ad4820ab | 449 | cur_base_offset = cur_base_offset / ((int) TYPE_LENGTH (ptr_type)); |
1514d34e | 450 | |
8af8e3bc | 451 | vtable = gnuv3_get_vtable (gdbarch, type, address + embedded_offset); |
d48cc9dd | 452 | gdb_assert (vtable != NULL); |
1514d34e | 453 | vbase_array = value_field (vtable, vtable_field_vcall_and_vbase_offsets); |
2497b498 | 454 | base_offset = value_as_long (value_subscript (vbase_array, cur_base_offset)); |
1514d34e DJ |
455 | return base_offset; |
456 | } | |
7ed49443 | 457 | |
0d5de010 DJ |
458 | /* Locate a virtual method in DOMAIN or its non-virtual base classes |
459 | which has virtual table index VOFFSET. The method has an associated | |
460 | "this" adjustment of ADJUSTMENT bytes. */ | |
461 | ||
2c0b251b | 462 | static const char * |
0d5de010 DJ |
463 | gnuv3_find_method_in (struct type *domain, CORE_ADDR voffset, |
464 | LONGEST adjustment) | |
465 | { | |
466 | int i; | |
0d5de010 DJ |
467 | |
468 | /* Search this class first. */ | |
0d5de010 DJ |
469 | if (adjustment == 0) |
470 | { | |
471 | int len; | |
472 | ||
473 | len = TYPE_NFN_FIELDS (domain); | |
474 | for (i = 0; i < len; i++) | |
475 | { | |
476 | int len2, j; | |
477 | struct fn_field *f; | |
478 | ||
479 | f = TYPE_FN_FIELDLIST1 (domain, i); | |
480 | len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i); | |
481 | ||
482 | check_stub_method_group (domain, i); | |
483 | for (j = 0; j < len2; j++) | |
484 | if (TYPE_FN_FIELD_VOFFSET (f, j) == voffset) | |
485 | return TYPE_FN_FIELD_PHYSNAME (f, j); | |
486 | } | |
487 | } | |
488 | ||
489 | /* Next search non-virtual bases. If it's in a virtual base, | |
490 | we're out of luck. */ | |
491 | for (i = 0; i < TYPE_N_BASECLASSES (domain); i++) | |
492 | { | |
493 | int pos; | |
494 | struct type *basetype; | |
495 | ||
496 | if (BASETYPE_VIA_VIRTUAL (domain, i)) | |
497 | continue; | |
498 | ||
499 | pos = TYPE_BASECLASS_BITPOS (domain, i) / 8; | |
500 | basetype = TYPE_FIELD_TYPE (domain, i); | |
501 | /* Recurse with a modified adjustment. We don't need to adjust | |
502 | voffset. */ | |
503 | if (adjustment >= pos && adjustment < pos + TYPE_LENGTH (basetype)) | |
504 | return gnuv3_find_method_in (basetype, voffset, adjustment - pos); | |
505 | } | |
506 | ||
507 | return NULL; | |
508 | } | |
509 | ||
fead6908 UW |
510 | /* Decode GNU v3 method pointer. */ |
511 | ||
512 | static int | |
ad4820ab UW |
513 | gnuv3_decode_method_ptr (struct gdbarch *gdbarch, |
514 | const gdb_byte *contents, | |
fead6908 UW |
515 | CORE_ADDR *value_p, |
516 | LONGEST *adjustment_p) | |
517 | { | |
ad4820ab | 518 | struct type *funcptr_type = builtin_type (gdbarch)->builtin_func_ptr; |
ed09d7da | 519 | struct type *offset_type = vtable_ptrdiff_type (gdbarch); |
e17a4113 | 520 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
fead6908 UW |
521 | CORE_ADDR ptr_value; |
522 | LONGEST voffset, adjustment; | |
523 | int vbit; | |
524 | ||
525 | /* Extract the pointer to member. The first element is either a pointer | |
526 | or a vtable offset. For pointers, we need to use extract_typed_address | |
527 | to allow the back-end to convert the pointer to a GDB address -- but | |
528 | vtable offsets we must handle as integers. At this point, we do not | |
529 | yet know which case we have, so we extract the value under both | |
530 | interpretations and choose the right one later on. */ | |
531 | ptr_value = extract_typed_address (contents, funcptr_type); | |
e17a4113 UW |
532 | voffset = extract_signed_integer (contents, |
533 | TYPE_LENGTH (funcptr_type), byte_order); | |
fead6908 | 534 | contents += TYPE_LENGTH (funcptr_type); |
e17a4113 UW |
535 | adjustment = extract_signed_integer (contents, |
536 | TYPE_LENGTH (offset_type), byte_order); | |
fead6908 | 537 | |
ad4820ab | 538 | if (!gdbarch_vbit_in_delta (gdbarch)) |
fead6908 UW |
539 | { |
540 | vbit = voffset & 1; | |
541 | voffset = voffset ^ vbit; | |
542 | } | |
543 | else | |
544 | { | |
545 | vbit = adjustment & 1; | |
546 | adjustment = adjustment >> 1; | |
547 | } | |
548 | ||
549 | *value_p = vbit? voffset : ptr_value; | |
550 | *adjustment_p = adjustment; | |
551 | return vbit; | |
552 | } | |
553 | ||
0d5de010 DJ |
554 | /* GNU v3 implementation of cplus_print_method_ptr. */ |
555 | ||
556 | static void | |
557 | gnuv3_print_method_ptr (const gdb_byte *contents, | |
558 | struct type *type, | |
559 | struct ui_file *stream) | |
560 | { | |
ad4820ab | 561 | struct type *domain = TYPE_DOMAIN_TYPE (type); |
50810684 | 562 | struct gdbarch *gdbarch = get_type_arch (domain); |
0d5de010 DJ |
563 | CORE_ADDR ptr_value; |
564 | LONGEST adjustment; | |
0d5de010 DJ |
565 | int vbit; |
566 | ||
0d5de010 | 567 | /* Extract the pointer to member. */ |
ad4820ab | 568 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
569 | |
570 | /* Check for NULL. */ | |
571 | if (ptr_value == 0 && vbit == 0) | |
572 | { | |
573 | fprintf_filtered (stream, "NULL"); | |
574 | return; | |
575 | } | |
576 | ||
577 | /* Search for a virtual method. */ | |
578 | if (vbit) | |
579 | { | |
580 | CORE_ADDR voffset; | |
581 | const char *physname; | |
582 | ||
583 | /* It's a virtual table offset, maybe in this class. Search | |
584 | for a field with the correct vtable offset. First convert it | |
585 | to an index, as used in TYPE_FN_FIELD_VOFFSET. */ | |
ed09d7da | 586 | voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch)); |
0d5de010 DJ |
587 | |
588 | physname = gnuv3_find_method_in (domain, voffset, adjustment); | |
589 | ||
590 | /* If we found a method, print that. We don't bother to disambiguate | |
591 | possible paths to the method based on the adjustment. */ | |
592 | if (physname) | |
593 | { | |
594 | char *demangled_name = cplus_demangle (physname, | |
595 | DMGL_ANSI | DMGL_PARAMS); | |
d8734c88 | 596 | |
94af9270 KS |
597 | fprintf_filtered (stream, "&virtual "); |
598 | if (demangled_name == NULL) | |
599 | fputs_filtered (physname, stream); | |
600 | else | |
0d5de010 | 601 | { |
0d5de010 DJ |
602 | fputs_filtered (demangled_name, stream); |
603 | xfree (demangled_name); | |
0d5de010 | 604 | } |
94af9270 | 605 | return; |
0d5de010 DJ |
606 | } |
607 | } | |
94af9270 KS |
608 | else if (ptr_value != 0) |
609 | { | |
610 | /* Found a non-virtual function: print out the type. */ | |
611 | fputs_filtered ("(", stream); | |
612 | c_print_type (type, "", stream, -1, 0); | |
613 | fputs_filtered (") ", stream); | |
614 | } | |
0d5de010 DJ |
615 | |
616 | /* We didn't find it; print the raw data. */ | |
617 | if (vbit) | |
618 | { | |
619 | fprintf_filtered (stream, "&virtual table offset "); | |
620 | print_longest (stream, 'd', 1, ptr_value); | |
621 | } | |
622 | else | |
5af949e3 | 623 | print_address_demangle (gdbarch, ptr_value, stream, demangle); |
0d5de010 DJ |
624 | |
625 | if (adjustment) | |
626 | { | |
627 | fprintf_filtered (stream, ", this adjustment "); | |
628 | print_longest (stream, 'd', 1, adjustment); | |
629 | } | |
630 | } | |
631 | ||
632 | /* GNU v3 implementation of cplus_method_ptr_size. */ | |
633 | ||
634 | static int | |
ad4820ab | 635 | gnuv3_method_ptr_size (struct type *type) |
0d5de010 | 636 | { |
561d3825 | 637 | struct gdbarch *gdbarch = get_type_arch (type); |
d8734c88 | 638 | |
ad4820ab | 639 | return 2 * TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr); |
0d5de010 DJ |
640 | } |
641 | ||
642 | /* GNU v3 implementation of cplus_make_method_ptr. */ | |
643 | ||
644 | static void | |
ad4820ab UW |
645 | gnuv3_make_method_ptr (struct type *type, gdb_byte *contents, |
646 | CORE_ADDR value, int is_virtual) | |
0d5de010 | 647 | { |
561d3825 | 648 | struct gdbarch *gdbarch = get_type_arch (type); |
ad4820ab | 649 | int size = TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr); |
e17a4113 | 650 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0d5de010 DJ |
651 | |
652 | /* FIXME drow/2006-12-24: The adjustment of "this" is currently | |
653 | always zero, since the method pointer is of the correct type. | |
654 | But if the method pointer came from a base class, this is | |
655 | incorrect - it should be the offset to the base. The best | |
656 | fix might be to create the pointer to member pointing at the | |
657 | base class and cast it to the derived class, but that requires | |
658 | support for adjusting pointers to members when casting them - | |
659 | not currently supported by GDB. */ | |
660 | ||
ad4820ab | 661 | if (!gdbarch_vbit_in_delta (gdbarch)) |
0d5de010 | 662 | { |
e17a4113 UW |
663 | store_unsigned_integer (contents, size, byte_order, value | is_virtual); |
664 | store_unsigned_integer (contents + size, size, byte_order, 0); | |
0d5de010 DJ |
665 | } |
666 | else | |
667 | { | |
e17a4113 UW |
668 | store_unsigned_integer (contents, size, byte_order, value); |
669 | store_unsigned_integer (contents + size, size, byte_order, is_virtual); | |
0d5de010 DJ |
670 | } |
671 | } | |
672 | ||
673 | /* GNU v3 implementation of cplus_method_ptr_to_value. */ | |
674 | ||
675 | static struct value * | |
676 | gnuv3_method_ptr_to_value (struct value **this_p, struct value *method_ptr) | |
677 | { | |
ad4820ab | 678 | struct gdbarch *gdbarch; |
0d5de010 DJ |
679 | const gdb_byte *contents = value_contents (method_ptr); |
680 | CORE_ADDR ptr_value; | |
ad4820ab | 681 | struct type *domain_type, *final_type, *method_type; |
0d5de010 | 682 | LONGEST adjustment; |
0d5de010 DJ |
683 | int vbit; |
684 | ||
ad4820ab UW |
685 | domain_type = TYPE_DOMAIN_TYPE (check_typedef (value_type (method_ptr))); |
686 | final_type = lookup_pointer_type (domain_type); | |
0d5de010 DJ |
687 | |
688 | method_type = TYPE_TARGET_TYPE (check_typedef (value_type (method_ptr))); | |
689 | ||
fead6908 | 690 | /* Extract the pointer to member. */ |
50810684 | 691 | gdbarch = get_type_arch (domain_type); |
ad4820ab | 692 | vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment); |
0d5de010 DJ |
693 | |
694 | /* First convert THIS to match the containing type of the pointer to | |
695 | member. This cast may adjust the value of THIS. */ | |
696 | *this_p = value_cast (final_type, *this_p); | |
697 | ||
698 | /* Then apply whatever adjustment is necessary. This creates a somewhat | |
699 | strange pointer: it claims to have type FINAL_TYPE, but in fact it | |
700 | might not be a valid FINAL_TYPE. For instance, it might be a | |
701 | base class of FINAL_TYPE. And if it's not the primary base class, | |
702 | then printing it out as a FINAL_TYPE object would produce some pretty | |
703 | garbage. | |
704 | ||
705 | But we don't really know the type of the first argument in | |
706 | METHOD_TYPE either, which is why this happens. We can't | |
707 | dereference this later as a FINAL_TYPE, but once we arrive in the | |
708 | called method we'll have debugging information for the type of | |
709 | "this" - and that'll match the value we produce here. | |
710 | ||
711 | You can provoke this case by casting a Base::* to a Derived::*, for | |
712 | instance. */ | |
ad4820ab | 713 | *this_p = value_cast (builtin_type (gdbarch)->builtin_data_ptr, *this_p); |
2497b498 | 714 | *this_p = value_ptradd (*this_p, adjustment); |
0d5de010 DJ |
715 | *this_p = value_cast (final_type, *this_p); |
716 | ||
717 | if (vbit) | |
718 | { | |
ad4820ab | 719 | LONGEST voffset; |
d8734c88 | 720 | |
ed09d7da | 721 | voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch)); |
ad4820ab UW |
722 | return gnuv3_get_virtual_fn (gdbarch, value_ind (*this_p), |
723 | method_type, voffset); | |
0d5de010 DJ |
724 | } |
725 | else | |
726 | return value_from_pointer (lookup_pointer_type (method_type), ptr_value); | |
727 | } | |
728 | ||
c4aeac85 TT |
729 | /* Objects of this type are stored in a hash table and a vector when |
730 | printing the vtables for a class. */ | |
731 | ||
732 | struct value_and_voffset | |
733 | { | |
734 | /* The value representing the object. */ | |
735 | struct value *value; | |
736 | ||
737 | /* The maximum vtable offset we've found for any object at this | |
738 | offset in the outermost object. */ | |
739 | int max_voffset; | |
740 | }; | |
741 | ||
742 | typedef struct value_and_voffset *value_and_voffset_p; | |
743 | DEF_VEC_P (value_and_voffset_p); | |
744 | ||
745 | /* Hash function for value_and_voffset. */ | |
746 | ||
747 | static hashval_t | |
748 | hash_value_and_voffset (const void *p) | |
749 | { | |
750 | const struct value_and_voffset *o = p; | |
751 | ||
752 | return value_address (o->value) + value_embedded_offset (o->value); | |
753 | } | |
754 | ||
755 | /* Equality function for value_and_voffset. */ | |
756 | ||
757 | static int | |
758 | eq_value_and_voffset (const void *a, const void *b) | |
759 | { | |
760 | const struct value_and_voffset *ova = a; | |
761 | const struct value_and_voffset *ovb = b; | |
762 | ||
763 | return (value_address (ova->value) + value_embedded_offset (ova->value) | |
764 | == value_address (ovb->value) + value_embedded_offset (ovb->value)); | |
765 | } | |
766 | ||
767 | /* qsort comparison function for value_and_voffset. */ | |
768 | ||
769 | static int | |
770 | compare_value_and_voffset (const void *a, const void *b) | |
771 | { | |
772 | const struct value_and_voffset * const *ova = a; | |
773 | CORE_ADDR addra = (value_address ((*ova)->value) | |
774 | + value_embedded_offset ((*ova)->value)); | |
775 | const struct value_and_voffset * const *ovb = b; | |
776 | CORE_ADDR addrb = (value_address ((*ovb)->value) | |
777 | + value_embedded_offset ((*ovb)->value)); | |
778 | ||
779 | if (addra < addrb) | |
780 | return -1; | |
781 | if (addra > addrb) | |
782 | return 1; | |
783 | return 0; | |
784 | } | |
785 | ||
786 | /* A helper function used when printing vtables. This determines the | |
787 | key (most derived) sub-object at each address and also computes the | |
788 | maximum vtable offset seen for the corresponding vtable. Updates | |
789 | OFFSET_HASH and OFFSET_VEC with a new value_and_voffset object, if | |
790 | needed. VALUE is the object to examine. */ | |
791 | ||
792 | static void | |
793 | compute_vtable_size (htab_t offset_hash, | |
794 | VEC (value_and_voffset_p) **offset_vec, | |
795 | struct value *value) | |
796 | { | |
797 | int i; | |
798 | struct type *type = check_typedef (value_type (value)); | |
799 | void **slot; | |
800 | struct value_and_voffset search_vo, *current_vo; | |
801 | CORE_ADDR addr = value_address (value) + value_embedded_offset (value); | |
802 | ||
803 | /* If the object is not dynamic, then we are done; as it cannot have | |
804 | dynamic base types either. */ | |
805 | if (!gnuv3_dynamic_class (type)) | |
806 | return; | |
807 | ||
808 | /* Update the hash and the vec, if needed. */ | |
809 | search_vo.value = value; | |
810 | slot = htab_find_slot (offset_hash, &search_vo, INSERT); | |
811 | if (*slot) | |
812 | current_vo = *slot; | |
813 | else | |
814 | { | |
815 | current_vo = XNEW (struct value_and_voffset); | |
816 | current_vo->value = value; | |
817 | current_vo->max_voffset = -1; | |
818 | *slot = current_vo; | |
819 | VEC_safe_push (value_and_voffset_p, *offset_vec, current_vo); | |
820 | } | |
821 | ||
822 | /* Update the value_and_voffset object with the highest vtable | |
823 | offset from this class. */ | |
824 | for (i = 0; i < TYPE_NFN_FIELDS (type); ++i) | |
825 | { | |
826 | int j; | |
827 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, i); | |
828 | ||
829 | for (j = 0; j < TYPE_FN_FIELDLIST_LENGTH (type, i); ++j) | |
830 | { | |
831 | if (TYPE_FN_FIELD_VIRTUAL_P (fn, j)) | |
832 | { | |
833 | int voffset = TYPE_FN_FIELD_VOFFSET (fn, j); | |
834 | ||
835 | if (voffset > current_vo->max_voffset) | |
836 | current_vo->max_voffset = voffset; | |
837 | } | |
838 | } | |
839 | } | |
840 | ||
841 | /* Recurse into base classes. */ | |
842 | for (i = 0; i < TYPE_N_BASECLASSES (type); ++i) | |
843 | compute_vtable_size (offset_hash, offset_vec, value_field (value, i)); | |
844 | } | |
845 | ||
846 | /* Helper for gnuv3_print_vtable that prints a single vtable. */ | |
847 | ||
848 | static void | |
849 | print_one_vtable (struct gdbarch *gdbarch, struct value *value, | |
850 | int max_voffset, | |
851 | struct value_print_options *opts) | |
852 | { | |
853 | int i; | |
854 | struct type *type = check_typedef (value_type (value)); | |
855 | struct value *vtable; | |
856 | CORE_ADDR vt_addr; | |
857 | ||
858 | vtable = gnuv3_get_vtable (gdbarch, type, | |
859 | value_address (value) | |
860 | + value_embedded_offset (value)); | |
861 | vt_addr = value_address (value_field (vtable, | |
862 | vtable_field_virtual_functions)); | |
863 | ||
864 | printf_filtered (_("vtable for '%s' @ %s (subobject @ %s):\n"), | |
865 | TYPE_SAFE_NAME (type), | |
866 | paddress (gdbarch, vt_addr), | |
867 | paddress (gdbarch, (value_address (value) | |
868 | + value_embedded_offset (value)))); | |
869 | ||
870 | for (i = 0; i <= max_voffset; ++i) | |
871 | { | |
cafe75b0 JK |
872 | /* Initialize it just to avoid a GCC false warning. */ |
873 | CORE_ADDR addr = 0; | |
c4aeac85 | 874 | struct value *vfn; |
c4aeac85 TT |
875 | volatile struct gdb_exception ex; |
876 | ||
877 | printf_filtered ("[%d]: ", i); | |
878 | ||
879 | vfn = value_subscript (value_field (vtable, | |
880 | vtable_field_virtual_functions), | |
881 | i); | |
882 | ||
883 | if (gdbarch_vtable_function_descriptors (gdbarch)) | |
884 | vfn = value_addr (vfn); | |
885 | ||
886 | TRY_CATCH (ex, RETURN_MASK_ERROR) | |
887 | { | |
888 | addr = value_as_address (vfn); | |
889 | } | |
890 | if (ex.reason < 0) | |
891 | printf_filtered (_("<error: %s>"), ex.message); | |
892 | else | |
893 | print_function_pointer_address (gdbarch, addr, gdb_stdout, | |
894 | opts->addressprint); | |
895 | printf_filtered ("\n"); | |
896 | } | |
897 | } | |
898 | ||
899 | /* Implementation of the print_vtable method. */ | |
900 | ||
901 | static void | |
902 | gnuv3_print_vtable (struct value *value) | |
903 | { | |
904 | struct gdbarch *gdbarch; | |
905 | struct type *type; | |
906 | struct value *vtable; | |
907 | struct value_print_options opts; | |
908 | htab_t offset_hash; | |
909 | struct cleanup *cleanup; | |
5ff5c7b4 | 910 | VEC (value_and_voffset_p) *result_vec = NULL; |
c4aeac85 TT |
911 | struct value_and_voffset *iter; |
912 | int i, count; | |
913 | ||
914 | value = coerce_ref (value); | |
915 | type = check_typedef (value_type (value)); | |
916 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
917 | { | |
918 | value = value_ind (value); | |
919 | type = check_typedef (value_type (value)); | |
920 | } | |
921 | ||
922 | get_user_print_options (&opts); | |
923 | ||
924 | /* Respect 'set print object'. */ | |
925 | if (opts.objectprint) | |
926 | { | |
927 | value = value_full_object (value, NULL, 0, 0, 0); | |
928 | type = check_typedef (value_type (value)); | |
929 | } | |
930 | ||
931 | gdbarch = get_type_arch (type); | |
932 | vtable = gnuv3_get_vtable (gdbarch, type, | |
933 | value_as_address (value_addr (value))); | |
934 | ||
935 | if (!vtable) | |
936 | { | |
937 | printf_filtered (_("This object does not have a virtual function table\n")); | |
938 | return; | |
939 | } | |
940 | ||
941 | offset_hash = htab_create_alloc (1, hash_value_and_voffset, | |
942 | eq_value_and_voffset, | |
943 | xfree, xcalloc, xfree); | |
944 | cleanup = make_cleanup_htab_delete (offset_hash); | |
945 | make_cleanup (VEC_cleanup (value_and_voffset_p), &result_vec); | |
946 | ||
947 | compute_vtable_size (offset_hash, &result_vec, value); | |
948 | ||
949 | qsort (VEC_address (value_and_voffset_p, result_vec), | |
950 | VEC_length (value_and_voffset_p, result_vec), | |
951 | sizeof (value_and_voffset_p), | |
952 | compare_value_and_voffset); | |
953 | ||
954 | count = 0; | |
955 | for (i = 0; VEC_iterate (value_and_voffset_p, result_vec, i, iter); ++i) | |
956 | { | |
957 | if (iter->max_voffset >= 0) | |
958 | { | |
959 | if (count > 0) | |
960 | printf_filtered ("\n"); | |
961 | print_one_vtable (gdbarch, iter->value, iter->max_voffset, &opts); | |
962 | ++count; | |
963 | } | |
964 | } | |
965 | ||
966 | do_cleanups (cleanup); | |
967 | } | |
968 | ||
b18be20d DJ |
969 | /* Determine if we are currently in a C++ thunk. If so, get the address |
970 | of the routine we are thunking to and continue to there instead. */ | |
971 | ||
972 | static CORE_ADDR | |
52f729a7 | 973 | gnuv3_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc) |
b18be20d DJ |
974 | { |
975 | CORE_ADDR real_stop_pc, method_stop_pc; | |
9970f04b | 976 | struct gdbarch *gdbarch = get_frame_arch (frame); |
b18be20d DJ |
977 | struct minimal_symbol *thunk_sym, *fn_sym; |
978 | struct obj_section *section; | |
0d5cff50 | 979 | const char *thunk_name, *fn_name; |
b18be20d | 980 | |
9970f04b | 981 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
b18be20d DJ |
982 | if (real_stop_pc == 0) |
983 | real_stop_pc = stop_pc; | |
984 | ||
985 | /* Find the linker symbol for this potential thunk. */ | |
986 | thunk_sym = lookup_minimal_symbol_by_pc (real_stop_pc); | |
987 | section = find_pc_section (real_stop_pc); | |
988 | if (thunk_sym == NULL || section == NULL) | |
989 | return 0; | |
990 | ||
991 | /* The symbol's demangled name should be something like "virtual | |
992 | thunk to FUNCTION", where FUNCTION is the name of the function | |
993 | being thunked to. */ | |
994 | thunk_name = SYMBOL_DEMANGLED_NAME (thunk_sym); | |
995 | if (thunk_name == NULL || strstr (thunk_name, " thunk to ") == NULL) | |
996 | return 0; | |
997 | ||
998 | fn_name = strstr (thunk_name, " thunk to ") + strlen (" thunk to "); | |
999 | fn_sym = lookup_minimal_symbol (fn_name, NULL, section->objfile); | |
1000 | if (fn_sym == NULL) | |
1001 | return 0; | |
1002 | ||
1003 | method_stop_pc = SYMBOL_VALUE_ADDRESS (fn_sym); | |
e76f05fa | 1004 | real_stop_pc = gdbarch_skip_trampoline_code |
9970f04b | 1005 | (gdbarch, frame, method_stop_pc); |
b18be20d DJ |
1006 | if (real_stop_pc == 0) |
1007 | real_stop_pc = method_stop_pc; | |
1008 | ||
1009 | return real_stop_pc; | |
1010 | } | |
1011 | ||
41f1b697 DJ |
1012 | /* Return nonzero if a type should be passed by reference. |
1013 | ||
1014 | The rule in the v3 ABI document comes from section 3.1.1. If the | |
1015 | type has a non-trivial copy constructor or destructor, then the | |
1016 | caller must make a copy (by calling the copy constructor if there | |
1017 | is one or perform the copy itself otherwise), pass the address of | |
1018 | the copy, and then destroy the temporary (if necessary). | |
1019 | ||
1020 | For return values with non-trivial copy constructors or | |
1021 | destructors, space will be allocated in the caller, and a pointer | |
1022 | will be passed as the first argument (preceding "this"). | |
1023 | ||
1024 | We don't have a bulletproof mechanism for determining whether a | |
1025 | constructor or destructor is trivial. For GCC and DWARF2 debug | |
1026 | information, we can check the artificial flag. | |
1027 | ||
1028 | We don't do anything with the constructors or destructors, | |
1029 | but we have to get the argument passing right anyway. */ | |
1030 | static int | |
1031 | gnuv3_pass_by_reference (struct type *type) | |
1032 | { | |
1033 | int fieldnum, fieldelem; | |
1034 | ||
1035 | CHECK_TYPEDEF (type); | |
1036 | ||
1037 | /* We're only interested in things that can have methods. */ | |
1038 | if (TYPE_CODE (type) != TYPE_CODE_STRUCT | |
1039 | && TYPE_CODE (type) != TYPE_CODE_CLASS | |
1040 | && TYPE_CODE (type) != TYPE_CODE_UNION) | |
1041 | return 0; | |
1042 | ||
1043 | for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++) | |
1044 | for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum); | |
1045 | fieldelem++) | |
1046 | { | |
1047 | struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, fieldnum); | |
0d5cff50 | 1048 | const char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum); |
41f1b697 DJ |
1049 | struct type *fieldtype = TYPE_FN_FIELD_TYPE (fn, fieldelem); |
1050 | ||
1051 | /* If this function is marked as artificial, it is compiler-generated, | |
1052 | and we assume it is trivial. */ | |
1053 | if (TYPE_FN_FIELD_ARTIFICIAL (fn, fieldelem)) | |
1054 | continue; | |
1055 | ||
1056 | /* If we've found a destructor, we must pass this by reference. */ | |
1057 | if (name[0] == '~') | |
1058 | return 1; | |
1059 | ||
1060 | /* If the mangled name of this method doesn't indicate that it | |
1061 | is a constructor, we're not interested. | |
1062 | ||
1063 | FIXME drow/2007-09-23: We could do this using the name of | |
1064 | the method and the name of the class instead of dealing | |
1065 | with the mangled name. We don't have a convenient function | |
1066 | to strip off both leading scope qualifiers and trailing | |
1067 | template arguments yet. */ | |
1068 | if (!is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem))) | |
1069 | continue; | |
1070 | ||
1071 | /* If this method takes two arguments, and the second argument is | |
1072 | a reference to this class, then it is a copy constructor. */ | |
1073 | if (TYPE_NFIELDS (fieldtype) == 2 | |
1074 | && TYPE_CODE (TYPE_FIELD_TYPE (fieldtype, 1)) == TYPE_CODE_REF | |
0963b4bd MS |
1075 | && check_typedef (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (fieldtype, |
1076 | 1))) == type) | |
41f1b697 DJ |
1077 | return 1; |
1078 | } | |
1079 | ||
1080 | /* Even if all the constructors and destructors were artificial, one | |
1081 | of them may have invoked a non-artificial constructor or | |
1082 | destructor in a base class. If any base class needs to be passed | |
1083 | by reference, so does this class. Similarly for members, which | |
1084 | are constructed whenever this class is. We do not need to worry | |
1085 | about recursive loops here, since we are only looking at members | |
bceffbf3 | 1086 | of complete class type. Also ignore any static members. */ |
41f1b697 | 1087 | for (fieldnum = 0; fieldnum < TYPE_NFIELDS (type); fieldnum++) |
bceffbf3 JK |
1088 | if (! field_is_static (&TYPE_FIELD (type, fieldnum)) |
1089 | && gnuv3_pass_by_reference (TYPE_FIELD_TYPE (type, fieldnum))) | |
41f1b697 DJ |
1090 | return 1; |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
7ed49443 JB |
1095 | static void |
1096 | init_gnuv3_ops (void) | |
1097 | { | |
0963b4bd MS |
1098 | vtable_type_gdbarch_data |
1099 | = gdbarch_data_register_post_init (build_gdb_vtable_type); | |
7ed49443 JB |
1100 | |
1101 | gnu_v3_abi_ops.shortname = "gnu-v3"; | |
1102 | gnu_v3_abi_ops.longname = "GNU G++ Version 3 ABI"; | |
1103 | gnu_v3_abi_ops.doc = "G++ Version 3 ABI"; | |
358777b0 EZ |
1104 | gnu_v3_abi_ops.is_destructor_name = |
1105 | (enum dtor_kinds (*) (const char *))is_gnu_v3_mangled_dtor; | |
1106 | gnu_v3_abi_ops.is_constructor_name = | |
1107 | (enum ctor_kinds (*) (const char *))is_gnu_v3_mangled_ctor; | |
7ed49443 JB |
1108 | gnu_v3_abi_ops.is_vtable_name = gnuv3_is_vtable_name; |
1109 | gnu_v3_abi_ops.is_operator_name = gnuv3_is_operator_name; | |
1110 | gnu_v3_abi_ops.rtti_type = gnuv3_rtti_type; | |
1111 | gnu_v3_abi_ops.virtual_fn_field = gnuv3_virtual_fn_field; | |
1514d34e | 1112 | gnu_v3_abi_ops.baseclass_offset = gnuv3_baseclass_offset; |
0d5de010 DJ |
1113 | gnu_v3_abi_ops.print_method_ptr = gnuv3_print_method_ptr; |
1114 | gnu_v3_abi_ops.method_ptr_size = gnuv3_method_ptr_size; | |
1115 | gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr; | |
1116 | gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value; | |
c4aeac85 | 1117 | gnu_v3_abi_ops.print_vtable = gnuv3_print_vtable; |
b18be20d | 1118 | gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline; |
41f1b697 | 1119 | gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference; |
7ed49443 JB |
1120 | } |
1121 | ||
b9362cc7 | 1122 | extern initialize_file_ftype _initialize_gnu_v3_abi; /* -Wmissing-prototypes */ |
7ed49443 JB |
1123 | |
1124 | void | |
1125 | _initialize_gnu_v3_abi (void) | |
1126 | { | |
1127 | init_gnuv3_ops (); | |
1128 | ||
fe1f4a5e | 1129 | register_cp_abi (&gnu_v3_abi_ops); |
7ed49443 | 1130 | } |