CORE_ADDR
find_function_addr (struct value *function, struct type **retval_type)
{
struct type *ftype = check_typedef (value_type (function));
struct gdbarch *gdbarch = get_type_arch (ftype);
struct type *value_type = NULL;
/* Initialize it just to avoid a GCC false warning. */
CORE_ADDR funaddr = 0;
/* If it's a member function, just look at the function
part of it. */
/* Determine address to call. */
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
funaddr = value_address (function);
else if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
{
funaddr = value_as_address (function);
ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr,
¤t_target);
}
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
{
value_type = TYPE_TARGET_TYPE (ftype);
if (TYPE_GNU_IFUNC (ftype))
{
funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr);
/* Skip querying the function symbol if no RETVAL_TYPE has been
asked for. */
if (retval_type)
value_type = find_function_return_type (funaddr);
}
}
else if (TYPE_CODE (ftype) == TYPE_CODE_INT)
{
/* Handle the case of functions lacking debugging info.
Their values are characters since their addresses are char. */
if (TYPE_LENGTH (ftype) == 1)
funaddr = value_as_address (value_addr (function));
else
{
/* Handle function descriptors lacking debug info. */
int found_descriptor = 0;
funaddr = 0; /* pacify "gcc -Werror" */
if (VALUE_LVAL (function) == lval_memory)
{
CORE_ADDR nfunaddr;
funaddr = value_as_address (value_addr (function));
nfunaddr = funaddr;
funaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funaddr,
¤t_target);
if (funaddr != nfunaddr)
found_descriptor = 1;
}
if (!found_descriptor)
/* Handle integer used as address of a function. */
funaddr = (CORE_ADDR) value_as_long (function);
}
}
else
error (_("Invalid data type for function to be called."));
if (retval_type != NULL)
*retval_type = value_type;
return funaddr + gdbarch_deprecated_function_start_offset (gdbarch);
}
/* Return a virtual function as a value.
ARG1 is the object which provides the virtual function
table pointer. *ARG1P is side-effected in calling this function.
F is the list of member functions which contains the desired virtual
function.
J is an index into F which provides the desired virtual function.
TYPE is the type in which F is located. */
static struct value *
gnuv2_virtual_fn_field (struct value **arg1p, struct fn_field * f, int j,
struct type * type, int offset)
{
struct value *arg1 = *arg1p;
struct type *type1 = check_typedef (value_type (arg1));
struct type *entry_type;
/* First, get the virtual function table pointer. That comes
with a strange type, so cast it to type `pointer to long' (which
should serve just fine as a function type). Then, index into
the table, and convert final value to appropriate function type. */
struct value *entry;
struct value *vfn;
struct value *vtbl;
LONGEST vi = (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j);
struct type *fcontext = TYPE_FN_FIELD_FCONTEXT (f, j);
struct type *context;
struct type *context_vptr_basetype;
int context_vptr_fieldno;
if (fcontext == NULL)
/* We don't have an fcontext (e.g. the program was compiled with
g++ version 1). Try to get the vtbl from the TYPE_VPTR_BASETYPE.
This won't work right for multiple inheritance, but at least we
should do as well as GDB 3.x did. */
fcontext = TYPE_VPTR_BASETYPE (type);
context = lookup_pointer_type (fcontext);
/* Now context is a pointer to the basetype containing the vtbl. */
if (TYPE_TARGET_TYPE (context) != type1)
{
struct value *tmp = value_cast (context, value_addr (arg1));
arg1 = value_ind (tmp);
type1 = check_typedef (value_type (arg1));
}
context = type1;
/* Now context is the basetype containing the vtbl. */
/* This type may have been defined before its virtual function table
was. If so, fill in the virtual function table entry for the
type now. */
context_vptr_fieldno = get_vptr_fieldno (context, &context_vptr_basetype);
/* FIXME: What to do if vptr_fieldno is still -1? */
/* The virtual function table is now an array of structures
which have the form { int16 offset, delta; void *pfn; }. */
vtbl = value_primitive_field (arg1, 0, context_vptr_fieldno,
context_vptr_basetype);
/* With older versions of g++, the vtbl field pointed to an array
of structures. Nowadays it points directly to the structure. */
if (TYPE_CODE (value_type (vtbl)) == TYPE_CODE_PTR
&& TYPE_CODE (TYPE_TARGET_TYPE (value_type (vtbl))) == TYPE_CODE_ARRAY)
{
/* Handle the case where the vtbl field points to an
array of structures. */
vtbl = value_ind (vtbl);
/* Index into the virtual function table. This is hard-coded because
looking up a field is not cheap, and it may be important to save
time, e.g. if the user has set a conditional breakpoint calling
a virtual function. */
entry = value_subscript (vtbl, vi);
}
else
{
/* Handle the case where the vtbl field points directly to a
structure. */
vtbl = value_ptradd (vtbl, vi);
entry = value_ind (vtbl);
}
entry_type = check_typedef (value_type (entry));
if (TYPE_CODE (entry_type) == TYPE_CODE_STRUCT)
{
/* Move the `this' pointer according to the virtual function table. */
set_value_offset (arg1, value_offset (arg1)
+ value_as_long (value_field (entry, 0)));
if (!value_lazy (arg1))
{
set_value_lazy (arg1, 1);
value_fetch_lazy (arg1);
}
vfn = value_field (entry, 2);
}
else if (TYPE_CODE (entry_type) == TYPE_CODE_PTR)
vfn = entry;
else
error (_("I'm confused: virtual function table has bad type"));
/* Reinstantiate the function pointer with the correct type. */
deprecated_set_value_type (vfn,
lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j)));
*arg1p = arg1;
return vfn;
}
static struct type *
gnuv3_rtti_type (struct value *value,
int *full_p, int *top_p, int *using_enc_p)
{
struct gdbarch *gdbarch;
struct type *values_type = check_typedef (value_type (value));
struct value *vtable;
struct minimal_symbol *vtable_symbol;
const char *vtable_symbol_name;
const char *class_name;
struct type *run_time_type;
LONGEST offset_to_top;
char *atsign;
/* We only have RTTI for class objects. */
if (TYPE_CODE (values_type) != TYPE_CODE_CLASS)
return NULL;
/* Java doesn't have RTTI following the C++ ABI. */
if (TYPE_CPLUS_REALLY_JAVA (values_type))
return NULL;
/* Determine architecture. */
gdbarch = get_type_arch (values_type);
if (using_enc_p)
*using_enc_p = 0;
vtable = gnuv3_get_vtable (gdbarch, value_type (value),
value_as_address (value_addr (value)));
if (vtable == NULL)
return NULL;
/* Find the linker symbol for this vtable. */
vtable_symbol
= lookup_minimal_symbol_by_pc (value_address (vtable)
+ value_embedded_offset (vtable)).minsym;
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_SAFE_NAME (values_type));
if (vtable_symbol_name)
warning (_(" found `%s' instead"), vtable_symbol_name);
return NULL;
}
class_name = vtable_symbol_name + 11;
/* Strip off @plt and version suffixes. */
atsign = strchr (class_name, '@');
if (atsign != NULL)
{
char *copy;
copy = alloca (atsign - class_name + 1);
memcpy (copy, class_name, atsign - class_name);
copy[atsign - class_name] = '\0';
class_name = copy;
}
/* 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;
}
static void
java_print_value_fields (struct type *type, const gdb_byte *valaddr,
CORE_ADDR address, struct ui_file *stream,
int format, int recurse, enum val_prettyprint pretty)
{
int i, len, n_baseclasses;
CHECK_TYPEDEF (type);
fprintf_filtered (stream, "{");
len = TYPE_NFIELDS (type);
n_baseclasses = TYPE_N_BASECLASSES (type);
if (n_baseclasses > 0)
{
int i, n_baseclasses = TYPE_N_BASECLASSES (type);
for (i = 0; i < n_baseclasses; i++)
{
int boffset;
struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
char *basename = TYPE_NAME (baseclass);
const gdb_byte *base_valaddr;
if (BASETYPE_VIA_VIRTUAL (type, i))
continue;
if (basename != NULL && strcmp (basename, "java.lang.Object") == 0)
continue;
boffset = 0;
if (pretty)
{
fprintf_filtered (stream, "\n");
print_spaces_filtered (2 * (recurse + 1), stream);
}
fputs_filtered ("<", 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);
base_valaddr = valaddr;
java_print_value_fields (baseclass, base_valaddr, address + boffset,
stream, format, recurse + 1, pretty);
fputs_filtered (", ", stream);
}
}
if (!len && n_baseclasses == 1)
fprintf_filtered (stream, "<No data fields>");
else
{
int fields_seen = 0;
for (i = n_baseclasses; i < len; i++)
{
/* If requested, skip printing of static fields. */
if (TYPE_FIELD_STATIC (type, i))
{
char *name = TYPE_FIELD_NAME (type, i);
if (!static_field_print)
continue;
if (name != NULL && strcmp (name, "class") == 0)
continue;
}
if (fields_seen)
fprintf_filtered (stream, ", ");
else if (n_baseclasses > 0)
{
if (pretty)
{
fprintf_filtered (stream, "\n");
print_spaces_filtered (2 + 2 * recurse, stream);
fputs_filtered ("members of ", stream);
fputs_filtered (type_name_no_tag (type), stream);
fputs_filtered (": ", stream);
}
}
fields_seen = 1;
if (pretty)
{
fprintf_filtered (stream, "\n");
print_spaces_filtered (2 + 2 * recurse, stream);
}
else
{
wrap_here (n_spaces (2 + 2 * recurse));
}
if (inspect_it)
{
if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
fputs_filtered ("\"( ptr \"", stream);
else
fputs_filtered ("\"( nodef \"", stream);
if (TYPE_FIELD_STATIC (type, i))
fputs_filtered ("static ", stream);
fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
language_cplus,
DMGL_PARAMS | DMGL_ANSI);
fputs_filtered ("\" \"", stream);
fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
language_cplus,
DMGL_PARAMS | DMGL_ANSI);
fputs_filtered ("\") \"", stream);
}
else
{
annotate_field_begin (TYPE_FIELD_TYPE (type, i));
if (TYPE_FIELD_STATIC (type, i))
fputs_filtered ("static ", stream);
fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
language_cplus,
DMGL_PARAMS | DMGL_ANSI);
annotate_field_name_end ();
fputs_filtered (": ", stream);
annotate_field_value ();
}
if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
{
struct value *v;
/* Bitfields require special handling, especially due to byte
order problems. */
if (TYPE_FIELD_IGNORE (type, i))
{
fputs_filtered ("<optimized out or zero length>", stream);
}
else
{
v = value_from_longest (TYPE_FIELD_TYPE (type, i),
unpack_field_as_long (type, valaddr, i));
common_val_print (v, stream, format, 0, recurse + 1,
pretty, current_language);
}
}
else
{
if (TYPE_FIELD_IGNORE (type, i))
{
fputs_filtered ("<optimized out or zero length>", stream);
}
else if (TYPE_FIELD_STATIC (type, i))
{
struct value *v = value_static_field (type, i);
if (v == NULL)
fputs_filtered ("<optimized out>", stream);
else
{
struct type *t = check_typedef (value_type (v));
if (TYPE_CODE (t) == TYPE_CODE_STRUCT)
v = value_addr (v);
common_val_print (v, stream, format, 0, recurse + 1,
pretty, current_language);
}
}
else if (TYPE_FIELD_TYPE (type, i) == NULL)
fputs_filtered ("<unknown type>", stream);
else
{
val_print (TYPE_FIELD_TYPE (type, i),
valaddr + TYPE_FIELD_BITPOS (type, i) / 8, 0,
address + TYPE_FIELD_BITPOS (type, i) / 8,
stream, format, 0, recurse + 1, pretty,
current_language);
}
}
annotate_field_end ();
}
if (pretty)
{
fprintf_filtered (stream, "\n");
print_spaces_filtered (2 * recurse, stream);
}
}
fprintf_filtered (stream, "}");
}
