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* cp-valprint.c (cplus_print_value): Don't dump core if the

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baseclass doesn't have a name.
	* values.c (vb_match): New function, which finds the virtual
	base class pointer even if the types are nameless.
	(baseclass_{addr,offset}): Use it.
This commit is contained in:
Jim Kingdon 1993-07-30 01:42:09 +00:00
parent 0ccc65ec79
commit 1410f5f13b
3 changed files with 64 additions and 11 deletions
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6
gdb/ChangeLog
View File

@ -1,5 +1,11 @@
Thu Jul 29 12:09:46 1993 Jim Kingdon (kingdon@lioth.cygnus.com)
* cp-valprint.c (cplus_print_value): Don't dump core if the
baseclass doesn't have a name.
* values.c (vb_match): New function, which finds the virtual
base class pointer even if the types are nameless.
(baseclass_{addr,offset}): Use it.
* hppa-tdep.c: Make "maintenance print unwind" command from old
"unwind" command.

9
gdb/cp-valprint.c
View File

@ -338,6 +338,7 @@ cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print)
{
char *baddr;
int err;
char *basename = TYPE_NAME (TYPE_BASECLASS (type, i));
if (BASETYPE_VIA_VIRTUAL (type, i))
{
@ -357,8 +358,8 @@ cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print)
/* Fix to use baseclass_offset instead. FIXME */
baddr = baseclass_addr (type, i, valaddr, 0, &err);
if (err == 0 && baddr == 0)
error ("could not find virtual baseclass `%s'\n",
type_name_no_tag (TYPE_BASECLASS (type, i)));
error ("could not find virtual baseclass %s\n",
basename ? basename : "");
if (pretty)
{
@ -366,7 +367,9 @@ cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print)
print_spaces_filtered (2 * recurse, stream);
}
fputs_filtered ("<", stream);
fputs_filtered (type_name_no_tag (TYPE_BASECLASS (type, i)), stream);
/* Not sure what the best notation is in the case where there is no
baseclass name. */
fputs_filtered (basename ? basename : "", stream);
fputs_filtered ("> = ", stream);
if (err != 0)
fprintf_filtered (stream, "<invalid address 0x%x>", baddr);

60
gdb/values.c
View File

@ -991,6 +991,56 @@ value_from_vtable_info (arg, type)
return value_headof (arg, 0, type);
}
/* Return true if the INDEXth field of TYPE is a virtual baseclass
pointer which is for the base class whose type is BASECLASS. */
static int
vb_match (type, index, basetype)
struct type *type;
int index;
struct type *basetype;
{
struct type *fieldtype;
struct type *fieldtype_target_type;
char *name = TYPE_FIELD_NAME (type, index);
char *field_class_name = NULL;
if (*name != '_')
return 0;
/* gcc 2.4 uses _vb$. */
if (name[1] == 'v' && name[2] == 'b' && name[3] == CPLUS_MARKER)
field_class_name = name + 4;
/* gcc 2.5 will use __vb_. */
if (name[1] == '_' && name[2] == 'v' && name[3] == 'b' && name[4] == '_')
field_class_name = name + 5;
if (field_class_name == NULL)
/* This field is not a virtual base class pointer. */
return 0;
/* It's a virtual baseclass pointer, now we just need to find out whether
it is for this baseclass. */
fieldtype = TYPE_FIELD_TYPE (type, index);
if (fieldtype == NULL
|| TYPE_CODE (fieldtype) != TYPE_CODE_PTR)
/* "Can't happen". */
return 0;
/* What we check for is that either the types are equal (needed for
nameless types) or have the same name. This is ugly, and a more
elegant solution should be devised (which would probably just push
the ugliness into symbol reading unless we change the stabs format). */
if (TYPE_TARGET_TYPE (fieldtype) == basetype)
return 1;
if (TYPE_NAME (basetype) != NULL
&& TYPE_NAME (TYPE_TARGET_TYPE (fieldtype)) != NULL
&& STREQ (TYPE_NAME (basetype),
TYPE_NAME (TYPE_TARGET_TYPE (fieldtype))))
return 1;
return 0;
}
/* Compute the offset of the baseclass which is
the INDEXth baseclass of class TYPE, for a value ARG,
wih extra offset of OFFSET.
@ -1013,15 +1063,12 @@ baseclass_offset (type, index, arg, offset)
/* Must hunt for the pointer to this virtual baseclass. */
register int i, len = TYPE_NFIELDS (type);
register int n_baseclasses = TYPE_N_BASECLASSES (type);
char *vbase_name, *type_name = type_name_no_tag (basetype);
vbase_name = (char *)alloca (strlen (type_name) + 8);
sprintf (vbase_name, "_vb%c%s", CPLUS_MARKER, type_name);
/* First look for the virtual baseclass pointer
in the fields. */
for (i = n_baseclasses; i < len; i++)
{
if (STREQ (vbase_name, TYPE_FIELD_NAME (type, i)))
if (vb_match (type, i, basetype))
{
CORE_ADDR addr
= unpack_pointer (TYPE_FIELD_TYPE (type, i),
@ -1081,15 +1128,12 @@ baseclass_addr (type, index, valaddr, valuep, errp)
/* Must hunt for the pointer to this virtual baseclass. */
register int i, len = TYPE_NFIELDS (type);
register int n_baseclasses = TYPE_N_BASECLASSES (type);
char *vbase_name, *type_name = type_name_no_tag (basetype);
vbase_name = (char *)alloca (strlen (type_name) + 8);
sprintf (vbase_name, "_vb%c%s", CPLUS_MARKER, type_name);
/* First look for the virtual baseclass pointer
in the fields. */
for (i = n_baseclasses; i < len; i++)
{
if (STREQ (vbase_name, TYPE_FIELD_NAME (type, i)))
if (vb_match (type, i, basetype))
{
value val = allocate_value (basetype);
CORE_ADDR addr;