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/tmp/gdb-8.1/gdb/gnu-v2-abi.c
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1 /* Abstraction of GNU v2 abi.
2
3 Copyright (C) 2001-2018 Free Software Foundation, Inc.
4
5 Contributed by Daniel Berlin <dberlin@redhat.com>
6
7 This file is part of GDB.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21
22 #include "defs.h"
23 #include "symtab.h"
24 #include "gdbtypes.h"
25 #include "value.h"
26 #include "demangle.h"
27 #include "gdb-demangle.h"
28 #include "cp-abi.h"
29 #include "cp-support.h"
30 #include <ctype.h>
31
32 struct cp_abi_ops gnu_v2_abi_ops;
33
34 static int vb_match (struct type *, int, struct type *);
35
36 static enum dtor_kinds
37 gnuv2_is_destructor_name (const char *name)
38 {
39 if ((name[0] == '_' && is_cplus_marker (name[1]) && name[2] == '_')
40 || startswith (name, "__dt__"))
41 return complete_object_dtor;
42 else
43 return (enum dtor_kinds) 0;
44 }
45
46 static enum ctor_kinds
47 gnuv2_is_constructor_name (const char *name)
48 {
49 if ((name[0] == '_' && name[1] == '_'
50 && (isdigit (name[2]) || strchr ("Qt", name[2])))
51 || startswith (name, "__ct__"))
52 return complete_object_ctor;
53 else
54 return (enum ctor_kinds) 0;
55 }
56
57 static int
58 gnuv2_is_vtable_name (const char *name)
59 {
60 return (((name)[0] == '_'
61 && (((name)[1] == 'V' && (name)[2] == 'T')
62 || ((name)[1] == 'v' && (name)[2] == 't'))
63 && is_cplus_marker ((name)[3])) ||
64 ((name)[0] == '_' && (name)[1] == '_'
65 && (name)[2] == 'v' && (name)[3] == 't' && (name)[4] == '_'));
66 }
67
68 static int
69 gnuv2_is_operator_name (const char *name)
70 {
71 return startswith (name, CP_OPERATOR_STR);
72 }
73
74
75 /* Return a virtual function as a value.
76 ARG1 is the object which provides the virtual function
77 table pointer. *ARG1P is side-effected in calling this function.
78 F is the list of member functions which contains the desired virtual
79 function.
80 J is an index into F which provides the desired virtual function.
81
82 TYPE is the type in which F is located. */
83 static struct value *
84 gnuv2_virtual_fn_field (struct value **arg1p, struct fn_field * f, int j,
85 struct type * type, int offset)
86 {
87 struct value *arg1 = *arg1p;
88 struct type *type1 = check_typedef (value_type (arg1));
89 struct type *entry_type;
90 /* First, get the virtual function table pointer. That comes
91 with a strange type, so cast it to type `pointer to long' (which
92 should serve just fine as a function type). Then, index into
93 the table, and convert final value to appropriate function type. */
94 struct value *entry;
95 struct value *vfn;
96 struct value *vtbl;
97 LONGEST vi = (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j);
98 struct type *fcontext = TYPE_FN_FIELD_FCONTEXT (f, j);
99 struct type *context;
100 struct type *context_vptr_basetype;
101 int context_vptr_fieldno;
102
103 if (fcontext == NULL)
104 /* We don't have an fcontext (e.g. the program was compiled with
105 g++ version 1). Try to get the vtbl from the TYPE_VPTR_BASETYPE.
106 This won't work right for multiple inheritance, but at least we
107 should do as well as GDB 3.x did. */
108 fcontext = TYPE_VPTR_BASETYPE (type);
109 context = lookup_pointer_type (fcontext);
110 /* Now context is a pointer to the basetype containing the vtbl. */
111 if (TYPE_TARGET_TYPE (context) != type1)
112 {
113 struct value *tmp = value_cast (context, value_addr (arg1));
114
115 arg1 = value_ind (tmp);
116 type1 = check_typedef (value_type (arg1));
117 }
118
119 context = type1;
120 /* Now context is the basetype containing the vtbl. */
121
122 /* This type may have been defined before its virtual function table
123 was. If so, fill in the virtual function table entry for the
124 type now. */
125 context_vptr_fieldno = get_vptr_fieldno (context, &context_vptr_basetype);
126 /* FIXME: What to do if vptr_fieldno is still -1? */
127
128 /* The virtual function table is now an array of structures
129 which have the form { int16 offset, delta; void *pfn; }. */
130 vtbl = value_primitive_field (arg1, 0, context_vptr_fieldno,
131 context_vptr_basetype);
132
133 /* With older versions of g++, the vtbl field pointed to an array
134 of structures. Nowadays it points directly to the structure. */
135 if (TYPE_CODE (value_type (vtbl)) == TYPE_CODE_PTR
136 && TYPE_CODE (TYPE_TARGET_TYPE (value_type (vtbl))) == TYPE_CODE_ARRAY)
137 {
138 /* Handle the case where the vtbl field points to an
139 array of structures. */
140 vtbl = value_ind (vtbl);
141
142 /* Index into the virtual function table. This is hard-coded because
143 looking up a field is not cheap, and it may be important to save
144 time, e.g. if the user has set a conditional breakpoint calling
145 a virtual function. */
146 entry = value_subscript (vtbl, vi);
147 }
148 else
149 {
150 /* Handle the case where the vtbl field points directly to a
151 structure. */
152 vtbl = value_ptradd (vtbl, vi);
153 entry = value_ind (vtbl);
154 }
155
156 entry_type = check_typedef (value_type (entry));
157
158 if (TYPE_CODE (entry_type) == TYPE_CODE_STRUCT)
159 {
160 /* Move the `this' pointer according to the virtual function table. */
161 set_value_offset (arg1, value_offset (arg1)
162 + value_as_long (value_field (entry, 0)));
163
164 if (!value_lazy (arg1))
165 {
166 set_value_lazy (arg1, 1);
167 value_fetch_lazy (arg1);
168 }
169
170 vfn = value_field (entry, 2);
171 }
172 else if (TYPE_CODE (entry_type) == TYPE_CODE_PTR)
173 vfn = entry;
174 else
175 error (_("I'm confused: virtual function table has bad type"));
176 /* Reinstantiate the function pointer with the correct type. */
177 deprecated_set_value_type (vfn,
178 lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j)));
179
180 *arg1p = arg1;
181 return vfn;
182 }
183
184
185 static struct type *
186 gnuv2_value_rtti_type (struct value *v, int *full, LONGEST *top, int *using_enc)
187 {
188 struct type *known_type;
189 struct type *rtti_type;
190 CORE_ADDR vtbl;
191 struct bound_minimal_symbol minsym;
192 char *demangled_name, *p;
193 const char *linkage_name;
194 struct type *btype;
195 struct type *known_type_vptr_basetype;
196 int known_type_vptr_fieldno;
197
198 if (full)
199 *full = 0;
200 if (top)
201 *top = -1;
202 if (using_enc)
203 *using_enc = 0;
204
205 /* Get declared type. */
206 known_type = value_type (v);
207 known_type = check_typedef (known_type);
208 /* RTTI works only or class objects. */
209 if (TYPE_CODE (known_type) != TYPE_CODE_STRUCT)
210 return NULL;
211
212 /* Plan on this changing in the future as i get around to setting
213 the vtables properly for G++ compiled stuff. Also, I'll be using
214 the type info functions, which are always right. Deal with it
215 until then. */
216
217 /* Try to get the vptr basetype, fieldno. */
218 known_type_vptr_fieldno = get_vptr_fieldno (known_type,
219 &known_type_vptr_basetype);
220
221 /* If we can't find it, give up. */
222 if (known_type_vptr_fieldno < 0)
223 return NULL;
224
225 /* Make sure our basetype and known type match, otherwise, cast
226 so we can get at the vtable properly. */
227 btype = known_type_vptr_basetype;
228 btype = check_typedef (btype);
229 if (btype != known_type )
230 {
231 v = value_cast (btype, v);
232 if (using_enc)
233 *using_enc=1;
234 }
235 /* We can't use value_ind here, because it would want to use RTTI, and
236 we'd waste a bunch of time figuring out we already know the type.
237 Besides, we don't care about the type, just the actual pointer. */
238 if (value_address (value_field (v, known_type_vptr_fieldno)) == 0)
239 return NULL;
240
241 vtbl = value_as_address (value_field (v, known_type_vptr_fieldno));
242
243 /* Try to find a symbol that is the vtable. */
244 minsym=lookup_minimal_symbol_by_pc(vtbl);
245 if (minsym.minsym==NULL
246 || (linkage_name=MSYMBOL_LINKAGE_NAME (minsym.minsym))==NULL
247 || !is_vtable_name (linkage_name))
248 return NULL;
249
250 /* If we just skip the prefix, we get screwed by namespaces. */
251 demangled_name=gdb_demangle(linkage_name,DMGL_PARAMS|DMGL_ANSI);
252 p = strchr (demangled_name, ' ');
253 if (p)
254 *p = '\0';
255
256 /* Lookup the type for the name. */
257 /* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */
258 rtti_type = cp_lookup_rtti_type (demangled_name, NULL);
259 if (rtti_type == NULL)
260 return NULL;
261
262 if (TYPE_N_BASECLASSES(rtti_type) > 1 && full && (*full) != 1)
263 {
264 if (top)
265 *top = TYPE_BASECLASS_BITPOS (rtti_type,
266 TYPE_VPTR_FIELDNO(rtti_type)) / 8;
267 if (top && ((*top) >0))
268 {
269 if (TYPE_LENGTH(rtti_type) > TYPE_LENGTH(known_type))
270 {
271 if (full)
272 *full=0;
273 }
274 else
275 {
276 if (full)
277 *full=1;
278 }
279 }
280 }
281 else
282 {
283 if (full)
284 *full=1;
285 }
286
287 return rtti_type;
288 }
289
290 /* Return true if the INDEXth field of TYPE is a virtual baseclass
291 pointer which is for the base class whose type is BASECLASS. */
292
293 static int
294 vb_match (struct type *type, int index, struct type *basetype)
295 {
296 struct type *fieldtype;
297 const char *name = TYPE_FIELD_NAME (type, index);
298 const char *field_class_name = NULL;
299
300 if (*name != '_')
301 return 0;
302 /* gcc 2.4 uses _vb$. */
303 if (name[1] == 'v' && name[2] == 'b' && is_cplus_marker (name[3]))
304 field_class_name = name + 4;
305 /* gcc 2.5 will use __vb_. */
306 if (name[1] == '_' && name[2] == 'v' && name[3] == 'b' && name[4] == '_')
307 field_class_name = name + 5;
308
309 if (field_class_name == NULL)
310 /* This field is not a virtual base class pointer. */
311 return 0;
312
313 /* It's a virtual baseclass pointer, now we just need to find out whether
314 it is for this baseclass. */
315 fieldtype = TYPE_FIELD_TYPE (type, index);
316 if (fieldtype == NULL
317 || TYPE_CODE (fieldtype) != TYPE_CODE_PTR)
318 /* "Can't happen". */
319 return 0;
320
321 /* What we check for is that either the types are equal (needed for
322 nameless types) or have the same name. This is ugly, and a more
323 elegant solution should be devised (which would probably just push
324 the ugliness into symbol reading unless we change the stabs format). */
325 if (TYPE_TARGET_TYPE (fieldtype) == basetype)
326 return 1;
327
328 if (TYPE_NAME (basetype) != NULL
329 && TYPE_NAME (TYPE_TARGET_TYPE (fieldtype)) != NULL
330 && strcmp (TYPE_NAME (basetype),
331 TYPE_NAME (TYPE_TARGET_TYPE (fieldtype))) == 0)
332 return 1;
333 return 0;
334 }
335
336 /* Compute the offset of the baseclass which is the INDEXth baseclass
337 of class TYPE, for value at VALADDR (in host) at ADDRESS (in
338 target). The result is the offset of the baseclass value relative
339 to (the address of)(ARG) + OFFSET. */
340
341 static int
342 gnuv2_baseclass_offset (struct type *type, int index,
343 const bfd_byte *valaddr, LONGEST embedded_offset,
344 CORE_ADDR address, const struct value *val)
345 {
346 struct type *basetype = TYPE_BASECLASS (type, index);
347
348 if (BASETYPE_VIA_VIRTUAL (type, index))
349 {
350 /* Must hunt for the pointer to this virtual baseclass. */
351 int i, len = TYPE_NFIELDS (type);
352 int n_baseclasses = TYPE_N_BASECLASSES (type);
353
354 /* First look for the virtual baseclass pointer
355 in the fields. */
356 for (i = n_baseclasses; i < len; i++)
357 {
358 if (vb_match (type, i, basetype))
359 {
360 struct type *field_type;
361 LONGEST field_offset;
362 int field_length;
363 CORE_ADDR addr;
364
365 field_type = check_typedef (TYPE_FIELD_TYPE (type, i));
366 field_offset = TYPE_FIELD_BITPOS (type, i) / 8;
367 field_length = TYPE_LENGTH (field_type);
368
369 if (!value_bytes_available (val, embedded_offset + field_offset,
370 field_length))
371 throw_error (NOT_AVAILABLE_ERROR,
372 _("Virtual baseclass pointer is not available"));
373
374 addr = unpack_pointer (field_type,
375 valaddr + embedded_offset + field_offset);
376
377 return addr - (LONGEST) address + embedded_offset;
378 }
379 }
380 /* Not in the fields, so try looking through the baseclasses. */
381 for (i = index + 1; i < n_baseclasses; i++)
382 {
383 /* Don't go through baseclass_offset, as that wraps
384 exceptions, thus, inner exceptions would be wrapped more
385 than once. */
386 int boffset =
387 gnuv2_baseclass_offset (type, i, valaddr,
388 embedded_offset, address, val);
389
390 if (boffset)
391 return boffset;
392 }
393
394 error (_("Baseclass offset not found"));
395 }
396
397 /* Baseclass is easily computed. */
398 return TYPE_BASECLASS_BITPOS (type, index) / 8;
399 }
400
401 static void
402 init_gnuv2_ops (void)
403 {
404 gnu_v2_abi_ops.shortname = "gnu-v2";
405 gnu_v2_abi_ops.longname = "GNU G++ Version 2 ABI";
406 gnu_v2_abi_ops.doc = "G++ Version 2 ABI";
407 gnu_v2_abi_ops.is_destructor_name = gnuv2_is_destructor_name;
408 gnu_v2_abi_ops.is_constructor_name = gnuv2_is_constructor_name;
409 gnu_v2_abi_ops.is_vtable_name = gnuv2_is_vtable_name;
410 gnu_v2_abi_ops.is_operator_name = gnuv2_is_operator_name;
411 gnu_v2_abi_ops.virtual_fn_field = gnuv2_virtual_fn_field;
412 gnu_v2_abi_ops.rtti_type = gnuv2_value_rtti_type;
413 gnu_v2_abi_ops.baseclass_offset = gnuv2_baseclass_offset;
414 }
415
416 void
417 _initialize_gnu_v2_abi (void)
418 {
419 init_gnuv2_ops ();
420 register_cp_abi (&gnu_v2_abi_ops);
421 }
TYPE_CODE_ARRAY
Definition: gdbtypes.h:104
cp_abi_ops::doc
const char * doc
Definition: cp-abi.h:218
value_addr
struct value * value_addr(struct value *arg1)
Definition: valops.c:1462
cp_abi_ops::is_vtable_name
int(* is_vtable_name)(const char *name)
Definition: cp-abi.h:224
gnuv2_baseclass_offset
static int gnuv2_baseclass_offset(struct type *type, int index, const bfd_byte *valaddr, LONGEST embedded_offset, CORE_ADDR address, const struct value *val)
Definition: gnu-v2-abi.c:342
value_subscript
struct value * value_subscript(struct value *array, LONGEST index)
Definition: valarith.c:142
MSYMBOL_LINKAGE_NAME
#define MSYMBOL_LINKAGE_NAME(symbol)
Definition: symtab.h:707
CORE_ADDR
bfd_vma CORE_ADDR
Definition: common-types.h:41
get_vptr_fieldno
int get_vptr_fieldno(struct type *type, struct type **basetypep)
Definition: gdbtypes.c:1840
TYPE_FIELD_NAME
#define TYPE_FIELD_NAME(thistype, n)
Definition: gdbtypes.h:1372
TYPE_N_BASECLASSES
#define TYPE_N_BASECLASSES(thistype)
Definition: gdbtypes.h:1331
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CORE_ADDR unpack_pointer(struct type *type, const gdb_byte *valaddr)
Definition: value.c:2934
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Definition: value.c:2749
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#define TYPE_NAME(thistype)
Definition: gdbtypes.h:1224
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static struct type * gnuv2_value_rtti_type(struct value *v, int *full, LONGEST *top, int *using_enc)
Definition: gnu-v2-abi.c:186
gnuv2_is_destructor_name
static enum dtor_kinds gnuv2_is_destructor_name(const char *name)
Definition: gnu-v2-abi.c:37
BASETYPE_VIA_VIRTUAL
#define BASETYPE_VIA_VIRTUAL(thistype, index)
Definition: gdbtypes.h:1338
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int value_lazy(const struct value *value)
Definition: value.c:1383
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void set_value_lazy(struct value *value, int val)
Definition: value.c:1389
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struct value * value_ind(struct value *arg1)
Definition: valops.c:1542
cp-support.h
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enum ctor_kinds(* is_constructor_name)(const char *name)
Definition: cp-abi.h:222
_
#define _(String)
Definition: gdb_locale.h:35
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int value_bytes_available(const struct value *value, LONGEST offset, LONGEST length)
Definition: value.c:357
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Definition: gdbtypes.h:832
TYPE_FIELD_TYPE
#define TYPE_FIELD_TYPE(thistype, n)
Definition: gdbtypes.h:1371
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enum dtor_kinds(* is_destructor_name)(const char *name)
Definition: cp-abi.h:223
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Definition: cp-abi.h:44
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void deprecated_set_value_type(struct value *value, struct type *type)
Definition: value.c:1100
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LONGEST value_offset(const struct value *value)
Definition: value.c:1106
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Definition: common-exceptions.h:82
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static enum ctor_kinds gnuv2_is_constructor_name(const char *name)
Definition: gnu-v2-abi.c:47
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struct value * value_ptradd(struct value *arg1, LONGEST arg2)
Definition: valarith.c:80
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#define TYPE_VPTR_FIELDNO(thistype)
Definition: gdbtypes.h:1308
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static int gnuv2_is_operator_name(const char *name)
Definition: gnu-v2-abi.c:69
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int is_cplus_marker(int c)
Definition: demangle.c:153
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const char *const name
Definition: aarch64-tdep.c:76
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char * gdb_demangle(const char *name, int options)
Definition: cp-support.c:1518
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Definition: cp-abi.h:61
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static struct value * gnuv2_virtual_fn_field(struct value **arg1p, struct fn_field *f, int j, struct type *type, int offset)
Definition: gnu-v2-abi.c:84
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Definition: cp-abi.h:214
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struct type * check_typedef(struct type *type)
Definition: gdbtypes.c:2421
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struct value * value_field(struct value *arg1, int fieldno)
Definition: value.c:3152
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Definition: cp-support.c:1440
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int register_cp_abi(struct cp_abi_ops *abi)
Definition: cp-abi.c:250
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static void init_gnuv2_ops(void)
Definition: gnu-v2-abi.c:402
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Definition: minsyms.h:29
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struct cp_abi_ops gnu_v2_abi_ops
Definition: gnu-v2-abi.c:32
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int is_vtable_name(const char *name)
Definition: cp-abi.c:52
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Definition: gdbtypes.h:749
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int(* baseclass_offset)(struct type *type, int index, const bfd_byte *valaddr, LONGEST embedded_offset, CORE_ADDR address, const struct value *val)
Definition: cp-abi.h:232
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const char * longname
Definition: cp-abi.h:217
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static int startswith(const char *string, const char *pattern)
Definition: common-utils.h:107
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Definition: valops.c:351
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#define TYPE_BASECLASS(thistype, index)
Definition: gdbtypes.h:1330
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void set_value_offset(struct value *value, LONGEST offset)
Definition: value.c:1111
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static int gnuv2_is_vtable_name(const char *name)
Definition: gnu-v2-abi.c:58
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Definition: gdbtypes.h:106
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#define TYPE_FIELD_BITPOS(thistype, n)
Definition: gdbtypes.h:1374
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Definition: value.c:169
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#define CP_OPERATOR_STR
Definition: cp-support.h:51
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#define TYPE_FN_FIELD_VOFFSET(thisfn, n)
Definition: gdbtypes.h:1437
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Definition: gdbtypes.h:84
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#define TYPE_FN_FIELD_TYPE(thisfn, n)
Definition: gdbtypes.h:1427
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int(* is_operator_name)(const char *name)
Definition: cp-abi.h:225
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#define TYPE_TARGET_TYPE(thistype)
Definition: gdbtypes.h:1226
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void value_fetch_lazy(struct value *val)
Definition: value.c:3860
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struct bound_minimal_symbol lookup_minimal_symbol_by_pc(CORE_ADDR pc)
Definition: minsyms.c:928
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#define TYPE_FN_FIELD_FCONTEXT(thisfn, n)
Definition: gdbtypes.h:1436
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#define TYPE_CODE(thistype)
Definition: gdbtypes.h:1238
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struct type *(* rtti_type)(struct value *v, int *full, LONGEST *top, int *using_enc)
Definition: cp-abi.h:230
bound_minimal_symbol::minsym
struct minimal_symbol * minsym
Definition: minsyms.h:34
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ctor_kinds
Definition: cp-abi.h:40
offset
int offset
Definition: agent.c:65
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#define TYPE_VPTR_BASETYPE(thistype)
Definition: gdbtypes.h:1309
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#define TYPE_NFIELDS(thistype)
Definition: gdbtypes.h:1239
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const char * shortname
Definition: cp-abi.h:216
value.h
gdbtypes.h
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struct value * value_primitive_field(struct value *arg1, LONGEST offset, int fieldno, struct type *arg_type)
Definition: value.c:3028
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Definition: cp-abi.h:69
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struct type * value_type(const struct value *value)
Definition: value.c:1095
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CORE_ADDR value_as_address(struct value *val)
Definition: value.c:2762
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#define TYPE_LENGTH(thistype)
Definition: gdbtypes.h:1235
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#define TYPE_BASECLASS_BITPOS(thistype, index)
Definition: gdbtypes.h:1333
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static int vb_match(struct type *, int, struct type *)
Definition: gnu-v2-abi.c:294
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CORE_ADDR value_address(const struct value *value)
Definition: value.c:1529
error
void error(const char *fmt,...)
Definition: errors.c:38
_initialize_gnu_v2_abi
void _initialize_gnu_v2_abi(void)
Definition: gnu-v2-abi.c:417
lookup_pointer_type
struct type * lookup_pointer_type(struct type *type)
Definition: gdbtypes.c:381
throw_error
void throw_error(enum errors error, const char *fmt,...)
Definition: common-exceptions.c:389
LONGEST
long long LONGEST
Definition: common-types.h:52
cp-abi.h
cp_abi_ops::virtual_fn_field
struct value *(* virtual_fn_field)(struct value **arg1p, struct fn_field *f, int j, struct type *type, int offset)
Definition: cp-abi.h:226
gdb-demangle.h