static struct value *
gnuv3_get_vtable (struct gdbarch *gdbarch,
struct type *container_type, CORE_ADDR container_addr)
{
struct type *vtable_type = gdbarch_data (gdbarch,
vtable_type_gdbarch_data);
struct type *vtable_pointer_type;
struct value *vtable_pointer;
CORE_ADDR vtable_address;
/* If this type does not have a virtual table, don't read the first
field. */
if (!gnuv3_dynamic_class (check_typedef (container_type)))
return NULL;
/* We do not consult the debug information to find the virtual table.
The ABI specifies that it is always at offset zero in any class,
and debug information may not represent it.
We avoid using value_contents on principle, because the object might
be large. */
/* Find the type "pointer to virtual table". */
vtable_pointer_type = lookup_pointer_type (vtable_type);
/* Load it from the start of the class. */
vtable_pointer = value_at (vtable_pointer_type, container_addr);
vtable_address = value_as_address (vtable_pointer);
/* Correct it to point at the start of the virtual table, rather
than the address point. */
return value_at_lazy (vtable_type,
vtable_address
- vtable_address_point_offset (gdbarch));
}
static htab_t
syscm_get_symbol_map (struct symbol *symbol)
{
htab_t htab;
if (SYMBOL_OBJFILE_OWNED (symbol))
{
struct objfile *objfile = symbol_objfile (symbol);
htab = objfile_data (objfile, syscm_objfile_data_key);
if (htab == NULL)
{
htab = gdbscm_create_eqable_gsmob_ptr_map (syscm_hash_symbol_smob,
syscm_eq_symbol_smob);
set_objfile_data (objfile, syscm_objfile_data_key, htab);
}
}
else
{
struct gdbarch *gdbarch = symbol_arch (symbol);
struct syscm_gdbarch_data *data = gdbarch_data (gdbarch,
syscm_gdbarch_data_key);
htab = data->htab;
}
return htab;
}
void
libunwind_frame_set_descr (struct gdbarch *gdbarch,
struct libunwind_descr *descr)
{
struct libunwind_descr *arch_descr;
gdb_assert (gdbarch != NULL);
arch_descr = ((struct libunwind_descr *)
gdbarch_data (gdbarch, libunwind_descr_handle));
if (arch_descr == NULL)
{
/* First time here. Must initialize data area. */
arch_descr = (struct libunwind_descr *) libunwind_descr_init (gdbarch);
deprecated_set_gdbarch_data (gdbarch,
libunwind_descr_handle, arch_descr);
}
/* Copy new descriptor info into arch descriptor. */
arch_descr->gdb2uw = descr->gdb2uw;
arch_descr->uw2gdb = descr->uw2gdb;
arch_descr->is_fpreg = descr->is_fpreg;
arch_descr->accessors = descr->accessors;
arch_descr->special_accessors = descr->special_accessors;
}
static struct value *
gnuv3_get_vtable (struct gdbarch *gdbarch, struct value *container)
{
struct type *vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data);
struct type *vtable_pointer_type;
struct value *vtable_pointer;
CORE_ADDR vtable_pointer_address, vtable_address;
/* We do not consult the debug information to find the virtual table.
The ABI specifies that it is always at offset zero in any class,
and debug information may not represent it. We won't issue an
error if there's a class with virtual functions but no virtual table
pointer, but something's already gone seriously wrong if that
happens.
We avoid using value_contents on principle, because the object might
be large. */
/* Find the type "pointer to virtual table". */
vtable_pointer_type = lookup_pointer_type (vtable_type);
/* Load it from the start of the class. */
vtable_pointer_address = value_as_address (value_addr (container));
vtable_pointer = value_at (vtable_pointer_type, vtable_pointer_address);
vtable_address = value_as_address (vtable_pointer);
/* Correct it to point at the start of the virtual table, rather
than the address point. */
return value_at_lazy (vtable_type,
vtable_address - vtable_address_point_offset (gdbarch));
}
SCM
arscm_scm_from_arch (struct gdbarch *gdbarch)
{
SCM a_scm = (SCM) gdbarch_data (gdbarch, arch_object_data);
return a_scm;
}
/* Return the offset from the start of the imaginary `struct
gdb_gnu_v3_abi_vtable' object to the vtable's "address point"
(i.e., where objects' virtual table pointers point). */
static int
vtable_address_point_offset (struct gdbarch *gdbarch)
{
struct type *vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data);
return (TYPE_FIELD_BITPOS (vtable_type, vtable_field_virtual_functions)
/ TARGET_CHAR_BIT);
}
/* Return the ptrdiff_t type used in the vtable type. */
static struct type *
vtable_ptrdiff_type (struct gdbarch *gdbarch)
{
struct type *vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data);
/* The "offset_to_top" field has the appropriate (ptrdiff_t) type. */
return TYPE_FIELD_TYPE (vtable_type, vtable_field_offset_to_top);
}
PyObject *
gdbarch_to_arch_object (struct gdbarch *gdbarch)
{
PyObject *new_ref = (PyObject *) gdbarch_data (gdbarch, arch_object_data);
/* new_ref could be NULL if registration of arch_object with GDBARCH failed
in arch_object_data_init. */
Py_XINCREF (new_ref);
return new_ref;
}
static struct dwarf2_frame_ops *
dwarf2_frame_ops (struct gdbarch *gdbarch)
{
struct dwarf2_frame_ops *ops = gdbarch_data (gdbarch, dwarf2_frame_data);
if (ops == NULL)
{
/* ULGH, called during architecture initialization. Patch
things up. */
ops = dwarf2_frame_init (gdbarch);
set_gdbarch_data (gdbarch, dwarf2_frame_data, ops);
}
return ops;
}
void
frame_unwind_append_sniffer (struct gdbarch *gdbarch,
frame_unwind_sniffer_ftype *sniffer)
{
struct frame_unwind_table *table =
gdbarch_data (gdbarch, frame_unwind_data);
if (table == NULL)
{
/* ULGH, called during architecture initialization. Patch
things up. */
table = frame_unwind_init (gdbarch);
set_gdbarch_data (gdbarch, frame_unwind_data, table);
}
append_predicate (table, sniffer);
}
const struct frame_unwind *
frame_unwind_find_by_frame (struct frame_info *next_frame)
{
int i;
struct gdbarch *gdbarch = get_frame_arch (next_frame);
struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES && legacy_frame_p (gdbarch))
/* Seriously old code. Don't even try to use this new mechanism.
(Note: The variable USE_GENERIC_DUMMY_FRAMES is deprecated, not
the dummy frame mechanism. All architectures should be using
generic dummy frames). */
return legacy_saved_regs_unwind;
for (i = 0; i < table->nr; i++)
{
const struct frame_unwind *desc;
desc = table->sniffer[i] (next_frame);
if (desc != NULL)
return desc;
}
return legacy_saved_regs_unwind;
}
const struct builtin_f_type *
builtin_f_type (struct gdbarch *gdbarch)
{
return gdbarch_data (gdbarch, f_type_data);
}
/* Compute the offset of the baseclass which is
the INDEXth baseclass of class TYPE,
for value at VALADDR (in host) at ADDRESS (in target).
The result is the offset of the baseclass value relative
to (the address of)(ARG) + OFFSET.
-1 is returned on error. */
static int
gnuv3_baseclass_offset (struct type *type, int index, const bfd_byte *valaddr,
CORE_ADDR address)
{
struct gdbarch *gdbarch;
struct type *vtable_type;
struct type *ptr_type;
struct value *vtable;
struct type *vbasetype;
struct value *offset_val, *vbase_array;
CORE_ADDR vtable_address;
long int cur_base_offset, base_offset;
int vbasetype_vptr_fieldno;
/* Determine architecture. */
gdbarch = get_class_arch (type);
vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data);
ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
/* If it isn't a virtual base, this is easy. The offset is in the
type definition. */
if (!BASETYPE_VIA_VIRTUAL (type, index))
return TYPE_BASECLASS_BITPOS (type, index) / 8;
/* To access a virtual base, we need to use the vbase offset stored in
our vtable. Recent GCC versions provide this information. If it isn't
available, we could get what we needed from RTTI, or from drawing the
complete inheritance graph based on the debug info. Neither is
worthwhile. */
cur_base_offset = TYPE_BASECLASS_BITPOS (type, index) / 8;
if (cur_base_offset >= - vtable_address_point_offset (gdbarch))
error (_("Expected a negative vbase offset (old compiler?)"));
cur_base_offset = cur_base_offset + vtable_address_point_offset (gdbarch);
if ((- cur_base_offset) % TYPE_LENGTH (ptr_type) != 0)
error (_("Misaligned vbase offset."));
cur_base_offset = cur_base_offset / ((int) TYPE_LENGTH (ptr_type));
/* We're now looking for the cur_base_offset'th entry (negative index)
in the vcall_and_vbase_offsets array. We used to cast the object to
its TYPE_VPTR_BASETYPE, and reference the vtable as TYPE_VPTR_FIELDNO;
however, that cast can not be done without calling baseclass_offset again
if the TYPE_VPTR_BASETYPE is a virtual base class, as described in the
v3 C++ ABI Section 2.4.I.2.b. Fortunately the ABI guarantees that the
vtable pointer will be located at the beginning of the object, so we can
bypass the casting. Verify that the TYPE_VPTR_FIELDNO is in fact at the
start of whichever baseclass it resides in, as a sanity measure - iff
we have debugging information for that baseclass. */
vbasetype = check_typedef (TYPE_VPTR_BASETYPE (type));
vbasetype_vptr_fieldno = get_vptr_fieldno (vbasetype, NULL);
if (vbasetype_vptr_fieldno >= 0
&& TYPE_FIELD_BITPOS (vbasetype, vbasetype_vptr_fieldno) != 0)
error (_("Illegal vptr offset in class %s"),
TYPE_NAME (vbasetype) ? TYPE_NAME (vbasetype) : "<unknown>");
vtable_address = value_as_address (value_at_lazy (ptr_type, address));
vtable
= value_at_lazy (vtable_type,
vtable_address - vtable_address_point_offset (gdbarch));
offset_val = value_from_longest (builtin_type_int32, cur_base_offset);
vbase_array = value_field (vtable, vtable_field_vcall_and_vbase_offsets);
base_offset = value_as_long (value_subscript (vbase_array, offset_val));
return base_offset;
}
void
set_solib_ops (struct gdbarch *gdbarch, struct target_so_ops *new_ops)
{
struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
*ops = new_ops;
}
static struct target_so_ops *
solib_ops (struct gdbarch *gdbarch)
{
struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
return *ops;
}
static struct libunwind_descr *
libunwind_descr (struct gdbarch *gdbarch)
{
return gdbarch_data (gdbarch, libunwind_descr_handle);
}
const struct builtin_m2_type *
builtin_m2_type (struct gdbarch *gdbarch)
{
return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data);
}
static struct type *
gnuv3_rtti_type (struct value *value,
int *full_p, int *top_p, int *using_enc_p)
{
struct gdbarch *gdbarch;
struct type *vtable_type;
struct type *values_type = check_typedef (value_type (value));
CORE_ADDR vtable_address;
struct value *vtable;
struct minimal_symbol *vtable_symbol;
const char *vtable_symbol_name;
const char *class_name;
struct type *run_time_type;
struct type *base_type;
LONGEST offset_to_top;
struct type *values_type_vptr_basetype;
int values_type_vptr_fieldno;
/* We only have RTTI for class objects. */
if (TYPE_CODE (values_type) != TYPE_CODE_CLASS)
return NULL;
/* This routine may be called for Java types that do not have
a proper objfile. Just return NULL for those. */
if (!TYPE_OBJFILE (values_type)
|| !TYPE_OBJFILE (values_type)->obfd)
return NULL;
/* Determine architecture. */
gdbarch = get_class_arch (values_type);
vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data);
/* If we can't find the virtual table pointer for values_type, we
can't find the RTTI. */
values_type_vptr_fieldno = get_vptr_fieldno (values_type,
&values_type_vptr_basetype);
if (values_type_vptr_fieldno == -1)
return NULL;
if (using_enc_p)
*using_enc_p = 0;
/* Fetch VALUE's virtual table pointer, and tweak it to point at
an instance of our imaginary gdb_gnu_v3_abi_vtable structure. */
base_type = check_typedef (values_type_vptr_basetype);
if (values_type != base_type)
{
value = value_cast (base_type, value);
if (using_enc_p)
*using_enc_p = 1;
}
vtable_address
= value_as_address (value_field (value, values_type_vptr_fieldno));
vtable
= value_at_lazy (vtable_type,
vtable_address - vtable_address_point_offset (gdbarch));
/* Find the linker symbol for this vtable. */
vtable_symbol
= lookup_minimal_symbol_by_pc (value_address (vtable)
+ value_embedded_offset (vtable));
if (! vtable_symbol)
return NULL;
/* The symbol's demangled name should be something like "vtable for
CLASS", where CLASS is the name of the run-time type of VALUE.
If we didn't like this approach, we could instead look in the
type_info object itself to get the class name. But this way
should work just as well, and doesn't read target memory. */
vtable_symbol_name = SYMBOL_DEMANGLED_NAME (vtable_symbol);
if (vtable_symbol_name == NULL
|| strncmp (vtable_symbol_name, "vtable for ", 11))
{
warning (_("can't find linker symbol for virtual table for `%s' value"),
TYPE_NAME (values_type));
if (vtable_symbol_name)
warning (_(" found `%s' instead"), vtable_symbol_name);
return NULL;
}
class_name = vtable_symbol_name + 11;
/* Try to look up the class name as a type name. */
/* FIXME: chastain/2003-11-26: block=NULL is bogus. See pr gdb/1465. */
run_time_type = cp_lookup_rtti_type (class_name, NULL);
if (run_time_type == NULL)
return NULL;
/* Get the offset from VALUE to the top of the complete object.
NOTE: this is the reverse of the meaning of *TOP_P. */
offset_to_top
= value_as_long (value_field (vtable, vtable_field_offset_to_top));
if (full_p)
*full_p = (- offset_to_top == value_embedded_offset (value)
&& (TYPE_LENGTH (value_enclosing_type (value))
>= TYPE_LENGTH (run_time_type)));
if (top_p)
*top_p = - offset_to_top;
return run_time_type;
}