1 /* Support for printing C++ values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 Free Software Foundation, Inc.
6 This file is part of GDB.
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
27 #include "expression.h"
33 #include "gdb_string.h"
38 /* Indication of presence of HP-compiled object files */
39 extern int hp_som_som_object_present; /* defined in symtab.c */
42 int vtblprint; /* Controls printing of vtbl's */
43 int objectprint; /* Controls looking up an object's derived type
44 using what we find in its vtables. */
45 int static_field_print; /* Controls printing of static fields. */
47 static struct obstack dont_print_vb_obstack;
48 static struct obstack dont_print_statmem_obstack;
50 extern void _initialize_cp_valprint (void);
52 static void cp_print_static_field (struct type *, struct value *,
53 struct ui_file *, int, int,
54 enum val_prettyprint);
56 static void cp_print_value (struct type *, struct type *, char *, int,
57 CORE_ADDR, struct ui_file *, int, int,
58 enum val_prettyprint, struct type **);
60 static void cp_print_hpacc_virtual_table_entries (struct type *, int *,
62 struct ui_file *, int,
64 enum val_prettyprint);
68 cp_print_class_method (char *valaddr,
70 struct ui_file *stream)
73 struct fn_field *f = NULL;
82 struct type *target_type = check_typedef (TYPE_TARGET_TYPE (type));
84 domain = TYPE_DOMAIN_TYPE (target_type);
85 if (domain == (struct type *) NULL)
87 fprintf_filtered (stream, "<unknown>");
90 addr = unpack_pointer (lookup_pointer_type (builtin_type_void), valaddr);
91 if (METHOD_PTR_IS_VIRTUAL (addr))
93 offset = METHOD_PTR_TO_VOFFSET (addr);
94 len = TYPE_NFN_FIELDS (domain);
95 for (i = 0; i < len; i++)
97 f = TYPE_FN_FIELDLIST1 (domain, i);
98 len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
100 for (j = 0; j < len2; j++)
103 if (TYPE_FN_FIELD_VOFFSET (f, j) == offset)
105 if (TYPE_FN_FIELD_STUB (f, j))
106 check_stub_method (domain, i, j);
115 sym = find_pc_function (addr);
118 /* 1997-08-01 Currently unsupported with HP aCC */
119 if (hp_som_som_object_present)
121 fputs_filtered ("?? <not supported with HP aCC>", stream);
124 error ("invalid pointer to member function");
126 len = TYPE_NFN_FIELDS (domain);
127 for (i = 0; i < len; i++)
129 f = TYPE_FN_FIELDLIST1 (domain, i);
130 len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
132 for (j = 0; j < len2; j++)
135 if (TYPE_FN_FIELD_STUB (f, j))
136 check_stub_method (domain, i, j);
137 if (STREQ (SYMBOL_NAME (sym), TYPE_FN_FIELD_PHYSNAME (f, j)))
147 char *demangled_name;
149 fprintf_filtered (stream, "&");
150 fprintf_filtered (stream, kind);
151 demangled_name = cplus_demangle (TYPE_FN_FIELD_PHYSNAME (f, j),
152 DMGL_ANSI | DMGL_PARAMS);
153 if (demangled_name == NULL)
154 fprintf_filtered (stream, "<badly mangled name %s>",
155 TYPE_FN_FIELD_PHYSNAME (f, j));
158 fputs_filtered (demangled_name, stream);
159 xfree (demangled_name);
164 fprintf_filtered (stream, "(");
165 type_print (type, "", stream, -1);
166 fprintf_filtered (stream, ") %d", (int) addr >> 3);
170 /* This was what it was for gcc 2.4.5 and earlier. */
171 static const char vtbl_ptr_name_old[] =
173 CPLUS_MARKER, 'v', 't', 'b', 'l', '_', 'p', 't', 'r', '_',
174 't', 'y', 'p', 'e', 0
177 /* It was changed to this after 2.4.5. */
178 const char vtbl_ptr_name[] = "__vtbl_ptr_type";
180 /* HP aCC uses different names */
181 const char hpacc_vtbl_ptr_name[] = "__vfp";
182 const char hpacc_vtbl_ptr_type_name[] = "__vftyp";
185 /* Return truth value for assertion that TYPE is of the type
186 "pointer to virtual function". */
189 cp_is_vtbl_ptr_type (struct type *type)
191 char *typename = type_name_no_tag (type);
193 return (typename != NULL
194 && (STREQ (typename, vtbl_ptr_name)
195 || STREQ (typename, vtbl_ptr_name_old)));
198 /* Return truth value for the assertion that TYPE is of the type
199 "pointer to virtual function table". */
202 cp_is_vtbl_member (struct type *type)
204 if (TYPE_CODE (type) == TYPE_CODE_PTR)
206 type = TYPE_TARGET_TYPE (type);
207 if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
209 type = TYPE_TARGET_TYPE (type);
210 if (TYPE_CODE (type) == TYPE_CODE_STRUCT /* if not using thunks */
211 || TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
213 /* Virtual functions tables are full of pointers
214 to virtual functions. */
215 return cp_is_vtbl_ptr_type (type);
222 /* Mutually recursive subroutines of cp_print_value and c_val_print to
223 print out a structure's fields: cp_print_value_fields and cp_print_value.
225 TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
226 same meanings as in cp_print_value and c_val_print.
228 2nd argument REAL_TYPE is used to carry over the type of the derived
229 class across the recursion to base classes.
231 DONT_PRINT is an array of baseclass types that we
232 should not print, or zero if called from top level. */
235 cp_print_value_fields (struct type *type, struct type *real_type, char *valaddr,
236 int offset, CORE_ADDR address, struct ui_file *stream,
237 int format, int recurse, enum val_prettyprint pretty,
238 struct type **dont_print_vb, int dont_print_statmem)
240 int i, len, n_baseclasses;
241 struct obstack tmp_obstack;
242 char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack);
245 CHECK_TYPEDEF (type);
247 fprintf_filtered (stream, "{");
248 len = TYPE_NFIELDS (type);
249 n_baseclasses = TYPE_N_BASECLASSES (type);
251 /* First, print out baseclasses such that we don't print
252 duplicates of virtual baseclasses. */
254 if (n_baseclasses > 0)
255 cp_print_value (type, real_type, valaddr, offset, address, stream,
256 format, recurse + 1, pretty, dont_print_vb);
258 /* Second, print out data fields */
260 /* If there are no data fields, or if the only field is the
261 * vtbl pointer, skip this part */
262 if ((len == n_baseclasses)
263 || ((len - n_baseclasses == 1)
264 && TYPE_HAS_VTABLE (type)
265 && STREQN (TYPE_FIELD_NAME (type, n_baseclasses),
266 hpacc_vtbl_ptr_name, 5))
268 fprintf_filtered (stream, "<No data fields>");
271 extern int inspect_it;
273 if (dont_print_statmem == 0)
275 /* If we're at top level, carve out a completely fresh
276 chunk of the obstack and use that until this particular
277 invocation returns. */
278 tmp_obstack = dont_print_statmem_obstack;
279 obstack_finish (&dont_print_statmem_obstack);
282 for (i = n_baseclasses; i < len; i++)
284 /* If requested, skip printing of static fields. */
285 if (!static_field_print && TYPE_FIELD_STATIC (type, i))
288 /* If a vtable pointer appears, we'll print it out later */
289 if (TYPE_HAS_VTABLE (type)
290 && STREQN (TYPE_FIELD_NAME (type, i), hpacc_vtbl_ptr_name, 5))
294 fprintf_filtered (stream, ", ");
295 else if (n_baseclasses > 0)
299 fprintf_filtered (stream, "\n");
300 print_spaces_filtered (2 + 2 * recurse, stream);
301 fputs_filtered ("members of ", stream);
302 fputs_filtered (type_name_no_tag (type), stream);
303 fputs_filtered (": ", stream);
310 fprintf_filtered (stream, "\n");
311 print_spaces_filtered (2 + 2 * recurse, stream);
315 wrap_here (n_spaces (2 + 2 * recurse));
319 if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
320 fputs_filtered ("\"( ptr \"", stream);
322 fputs_filtered ("\"( nodef \"", stream);
323 if (TYPE_FIELD_STATIC (type, i))
324 fputs_filtered ("static ", stream);
325 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
327 DMGL_PARAMS | DMGL_ANSI);
328 fputs_filtered ("\" \"", stream);
329 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
331 DMGL_PARAMS | DMGL_ANSI);
332 fputs_filtered ("\") \"", stream);
336 annotate_field_begin (TYPE_FIELD_TYPE (type, i));
338 if (TYPE_FIELD_STATIC (type, i))
339 fputs_filtered ("static ", stream);
340 fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
342 DMGL_PARAMS | DMGL_ANSI);
343 annotate_field_name_end ();
344 /* do not print leading '=' in case of anonymous unions */
345 if (strcmp (TYPE_FIELD_NAME (type, i), ""))
346 fputs_filtered (" = ", stream);
347 annotate_field_value ();
350 if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
354 /* Bitfields require special handling, especially due to byte
356 if (TYPE_FIELD_IGNORE (type, i))
358 fputs_filtered ("<optimized out or zero length>", stream);
362 v = value_from_longest
363 (TYPE_FIELD_TYPE (type, i),
364 unpack_field_as_long (type, valaddr + offset, i));
366 val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v),
367 0, 0, stream, format, 0, recurse + 1, pretty);
372 if (TYPE_FIELD_IGNORE (type, i))
374 fputs_filtered ("<optimized out or zero length>", stream);
376 else if (TYPE_FIELD_STATIC (type, i))
378 struct value *v = value_static_field (type, i);
380 fputs_filtered ("<optimized out>", stream);
382 cp_print_static_field (TYPE_FIELD_TYPE (type, i), v,
383 stream, format, recurse + 1,
388 val_print (TYPE_FIELD_TYPE (type, i),
389 valaddr, offset + TYPE_FIELD_BITPOS (type, i) / 8,
390 address + TYPE_FIELD_BITPOS (type, i) / 8,
391 stream, format, 0, recurse + 1, pretty);
394 annotate_field_end ();
397 if (dont_print_statmem == 0)
399 /* Free the space used to deal with the printing
400 of the members from top level. */
401 obstack_free (&dont_print_statmem_obstack, last_dont_print);
402 dont_print_statmem_obstack = tmp_obstack;
407 fprintf_filtered (stream, "\n");
408 print_spaces_filtered (2 * recurse, stream);
410 } /* if there are data fields */
411 /* Now print out the virtual table pointer if there is one */
412 if (TYPE_HAS_VTABLE (type)
413 && STREQN (TYPE_FIELD_NAME (type, n_baseclasses),
418 /* First get the virtual table pointer and print it out */
421 fputs_filtered ("__vfp = ", stream);
424 fputs_filtered (", Virtual table at ", stream);
426 /* pai: FIXME 32x64 problem? */
427 /* Not sure what the best notation is in the case where there is no
429 v = value_from_pointer (lookup_pointer_type (builtin_type_unsigned_long),
430 *(unsigned long *) (valaddr + offset));
432 val_print (VALUE_TYPE (v), VALUE_CONTENTS (v), 0, 0,
433 stream, format, 0, recurse + 1, pretty);
438 /* Print out function pointers in vtable. */
440 /* FIXME: then-clause is for non-RRBC layout of virtual
441 * table. The RRBC case in the else-clause is yet to be
442 * implemented. The if (1) below should be changed to a
443 * test for whether the executable we have was compiled
444 * with a version of HP aCC that doesn't have RRBC
449 /* no RRBC support; function pointers embedded directly
452 int vfuncs = count_virtual_fns (real_type);
454 fputs_filtered (" {", stream);
456 /* FIXME : doesn't work at present */
458 fprintf_filtered (stream, "%d entr%s: ", vfuncs,
459 vfuncs == 1 ? "y" : "ies");
461 fputs_filtered ("not implemented", stream);
466 /* recursive function that prints all virtual function entries */
468 cp_print_hpacc_virtual_table_entries (real_type, &vfuncs, v,
469 stream, format, recurse,
472 fputs_filtered ("}", stream);
473 } /* non-RRBC case */
476 /* FIXME -- see comments above */
477 /* RRBC support present; function pointers are found
478 * by indirection through the class segment entries. */
486 fprintf_filtered (stream, "\n");
487 print_spaces_filtered (2 * recurse, stream);
490 } /* if vtable exists */
492 fprintf_filtered (stream, "}");
495 /* Special val_print routine to avoid printing multiple copies of virtual
499 cp_print_value (struct type *type, struct type *real_type, char *valaddr,
500 int offset, CORE_ADDR address, struct ui_file *stream,
501 int format, int recurse, enum val_prettyprint pretty,
502 struct type **dont_print_vb)
504 struct obstack tmp_obstack;
505 struct type **last_dont_print
506 = (struct type **) obstack_next_free (&dont_print_vb_obstack);
507 int i, n_baseclasses = TYPE_N_BASECLASSES (type);
509 struct type *thistype;
511 if (dont_print_vb == 0)
513 /* If we're at top level, carve out a completely fresh
514 chunk of the obstack and use that until this particular
515 invocation returns. */
516 tmp_obstack = dont_print_vb_obstack;
517 /* Bump up the high-water mark. Now alpha is omega. */
518 obstack_finish (&dont_print_vb_obstack);
521 for (i = 0; i < n_baseclasses; i++)
525 struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
526 char *basename = TYPE_NAME (baseclass);
529 if (BASETYPE_VIA_VIRTUAL (type, i))
531 struct type **first_dont_print
532 = (struct type **) obstack_base (&dont_print_vb_obstack);
534 int j = (struct type **) obstack_next_free (&dont_print_vb_obstack)
538 if (baseclass == first_dont_print[j])
541 obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
545 thistype = real_type;
546 if (TYPE_HAS_VTABLE (type) && BASETYPE_VIA_VIRTUAL (type, i))
548 /* Assume HP/Taligent runtime convention */
549 find_rt_vbase_offset (type, TYPE_BASECLASS (type, i),
550 valaddr, offset, &boffset, &skip);
552 error ("Virtual base class offset not found from vtable while"
554 base_valaddr = valaddr;
558 boffset = baseclass_offset (type, i,
561 skip = ((boffset == -1) || (boffset + offset) < 0) ? 1 : -1;
563 if (BASETYPE_VIA_VIRTUAL (type, i))
565 /* The virtual base class pointer might have been
566 clobbered by the user program. Make sure that it
567 still points to a valid memory location. */
570 && ((boffset + offset) < 0
571 || (boffset + offset) >= TYPE_LENGTH (type)))
573 /* FIXME (alloca): unsafe if baseclass is really really large. */
574 base_valaddr = (char *) alloca (TYPE_LENGTH (baseclass));
575 if (target_read_memory (address + offset + boffset, base_valaddr,
576 TYPE_LENGTH (baseclass)) != 0)
580 thistype = baseclass;
583 base_valaddr = valaddr;
586 base_valaddr = valaddr;
589 /* now do the printing */
592 fprintf_filtered (stream, "\n");
593 print_spaces_filtered (2 * recurse, stream);
595 fputs_filtered ("<", stream);
596 /* Not sure what the best notation is in the case where there is no
598 fputs_filtered (basename ? basename : "", stream);
599 fputs_filtered ("> = ", stream);
603 fprintf_filtered (stream, "<invalid address>");
605 cp_print_value_fields (baseclass, thistype, base_valaddr,
606 thisoffset + boffset, address, stream, format,
609 obstack_base (&dont_print_vb_obstack)),
611 fputs_filtered (", ", stream);
617 if (dont_print_vb == 0)
619 /* Free the space used to deal with the printing
620 of this type from top level. */
621 obstack_free (&dont_print_vb_obstack, last_dont_print);
622 /* Reset watermark so that we can continue protecting
623 ourselves from whatever we were protecting ourselves. */
624 dont_print_vb_obstack = tmp_obstack;
628 /* Print value of a static member.
629 To avoid infinite recursion when printing a class that contains
630 a static instance of the class, we keep the addresses of all printed
631 static member classes in an obstack and refuse to print them more
634 VAL contains the value to print, TYPE, STREAM, RECURSE, and PRETTY
635 have the same meanings as in c_val_print. */
638 cp_print_static_field (struct type *type,
640 struct ui_file *stream,
643 enum val_prettyprint pretty)
645 if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
647 CORE_ADDR *first_dont_print;
651 = (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
652 i = (CORE_ADDR *) obstack_next_free (&dont_print_statmem_obstack)
657 if (VALUE_ADDRESS (val) == first_dont_print[i])
659 fputs_filtered ("<same as static member of an already"
666 obstack_grow (&dont_print_statmem_obstack, (char *) &VALUE_ADDRESS (val),
669 CHECK_TYPEDEF (type);
670 cp_print_value_fields (type, type, VALUE_CONTENTS_ALL (val),
671 VALUE_EMBEDDED_OFFSET (val), VALUE_ADDRESS (val),
672 stream, format, recurse, pretty, NULL, 1);
675 val_print (type, VALUE_CONTENTS_ALL (val),
676 VALUE_EMBEDDED_OFFSET (val), VALUE_ADDRESS (val),
677 stream, format, 0, recurse, pretty);
681 cp_print_class_member (char *valaddr, struct type *domain,
682 struct ui_file *stream, char *prefix)
685 /* VAL is a byte offset into the structure type DOMAIN.
686 Find the name of the field for that offset and
690 register unsigned int i;
691 unsigned len = TYPE_NFIELDS (domain);
693 /* @@ Make VAL into bit offset */
695 /* Note: HP aCC generates offsets that are the real byte offsets added
696 to a constant bias 0x20000000 (1 << 29). This constant bias gets
697 shifted out in the code below -- joyous happenstance! */
699 /* Note: HP cfront uses a constant bias of 1; if we support this
700 compiler ever, we will have to adjust the computation below */
702 LONGEST val = unpack_long (builtin_type_int, valaddr) << 3;
703 for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
705 int bitpos = TYPE_FIELD_BITPOS (domain, i);
709 if (val < bitpos && i != 0)
711 /* Somehow pointing into a field. */
713 extra = (val - TYPE_FIELD_BITPOS (domain, i));
724 fprintf_filtered (stream, prefix);
725 name = type_name_no_tag (domain);
727 fputs_filtered (name, stream);
729 c_type_print_base (domain, stream, 0, 0);
730 fprintf_filtered (stream, "::");
731 fputs_filtered (TYPE_FIELD_NAME (domain, i), stream);
733 fprintf_filtered (stream, " + %d bytes", extra);
735 fprintf_filtered (stream, " (offset in bits)");
738 fprintf_filtered (stream, "%ld", (long) (val >> 3));
742 /* This function prints out virtual table entries for a class; it
743 * recurses on the base classes to find all virtual functions
744 * available in a class.
746 * pai/1997-05-21 Note: As the name suggests, it's currently
747 * implemented for HP aCC runtime only. g++ objects are handled
748 * differently and I have made no attempt to fold that logic in
749 * here. The runtime layout is different for the two cases. Also,
750 * this currently has only the code for non-RRBC layouts generated by
751 * the HP aCC compiler; RRBC code is stubbed out and will have to be
756 cp_print_hpacc_virtual_table_entries (struct type *type, int *vfuncs,
757 struct value *v, struct ui_file *stream,
758 int format, int recurse,
759 enum val_prettyprint pretty)
763 /* pai: FIXME this function doesn't work. It should handle a given
764 * virtual function only once (latest redefinition in class hierarchy)
767 /* Recursion on other classes that can share the same vtable */
768 struct type *pbc = primary_base_class (type);
770 cp_print_hpacc_virtual_table_entries (pbc, vfuncs, v, stream, format,
773 /* Now deal with vfuncs declared in this class */
774 for (fn = 0; fn < TYPE_NFN_FIELDS (type); fn++)
775 for (oi = 0; oi < TYPE_FN_FIELDLIST_LENGTH (type, fn); oi++)
776 if (TYPE_FN_FIELD_VIRTUAL_P (TYPE_FN_FIELDLIST1 (type, fn), oi))
779 const char *field_physname;
781 /* virtual function offset */
782 int vx = (TYPE_FN_FIELD_VOFFSET (TYPE_FN_FIELDLIST1 (type, fn), oi)
785 /* Get the address of the vfunction entry */
786 struct value *vf = value_copy (v);
788 (void) value_fetch_lazy (vf);
789 /* adjust by offset */
790 vf->aligner.contents[0] += 4 * (HP_ACC_VFUNC_START + vx);
791 vf = value_ind (vf); /* get the entry */
792 VALUE_TYPE (vf) = VALUE_TYPE (v); /* make it a pointer */
794 /* print out the entry */
795 val_print (VALUE_TYPE (vf), VALUE_CONTENTS (vf), 0, 0,
796 stream, format, 0, recurse + 1, pretty);
798 = TYPE_FN_FIELD_PHYSNAME (TYPE_FN_FIELDLIST1 (type, fn), oi);
799 /* pai: (temp) FIXME Maybe this should be DMGL_ANSI */
800 vf_name = cplus_demangle (field_physname, DMGL_ARM);
801 fprintf_filtered (stream, " %s", vf_name);
803 fputs_filtered (", ", stream);
810 _initialize_cp_valprint (void)
813 (add_set_cmd ("static-members", class_support, var_boolean,
814 (char *) &static_field_print,
815 "Set printing of C++ static members.",
818 /* Turn on printing of static fields. */
819 static_field_print = 1;
822 (add_set_cmd ("vtbl", class_support, var_boolean, (char *) &vtblprint,
823 "Set printing of C++ virtual function tables.",
828 (add_set_cmd ("object", class_support, var_boolean, (char *) &objectprint,
829 "Set printing of object's derived type based on vtable info.",
833 /* Give people the defaults which they are used to. */
836 obstack_begin (&dont_print_vb_obstack, 32 * sizeof (struct type *));
837 obstack_specify_allocation (&dont_print_statmem_obstack,
838 32 * sizeof (CORE_ADDR), sizeof (CORE_ADDR),