/* Abstraction of GNU v3 abi.
- Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007
+ Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GDB.
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "value.h"
described above, laid out appropriately for ARCH.
We use this function as the gdbarch per-architecture data
- initialization function. We assume that the gdbarch framework
- calls the per-architecture data initialization functions after it
- sets current_gdbarch to the new architecture. */
+ initialization function. */
static void *
build_gdb_vtable_type (struct gdbarch *arch)
{
int offset;
struct type *void_ptr_type
- = lookup_pointer_type (builtin_type_void);
+ = builtin_type (arch)->builtin_data_ptr;
struct type *ptr_to_void_fn_type
- = lookup_pointer_type (lookup_function_type (builtin_type_void));
+ = builtin_type (arch)->builtin_func_ptr;
/* ARCH can't give us the true ptrdiff_t type, so we guess. */
struct type *ptrdiff_type
- = init_type (TYPE_CODE_INT, TARGET_PTR_BIT / TARGET_CHAR_BIT, 0,
- "ptrdiff_t", 0);
+ = arch_integer_type (arch, gdbarch_ptr_bit (arch), 0, "ptrdiff_t");
/* We assume no padding is necessary, since GDB doesn't know
anything about alignment at the moment. If this assumption bites
/* ptrdiff_t vcall_and_vbase_offsets[0]; */
FIELD_NAME (*field) = "vcall_and_vbase_offsets";
- FIELD_TYPE (*field)
- = create_array_type (0, ptrdiff_type,
- create_range_type (0, builtin_type_int, 0, -1));
+ FIELD_TYPE (*field) = lookup_array_range_type (ptrdiff_type, 0, -1);
FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
offset += TYPE_LENGTH (FIELD_TYPE (*field));
field++;
/* void (*virtual_functions[0]) (); */
FIELD_NAME (*field) = "virtual_functions";
- FIELD_TYPE (*field)
- = create_array_type (0, ptr_to_void_fn_type,
- create_range_type (0, builtin_type_int, 0, -1));
+ FIELD_TYPE (*field) = lookup_array_range_type (ptr_to_void_fn_type, 0, -1);
FIELD_BITPOS (*field) = offset * TARGET_CHAR_BIT;
offset += TYPE_LENGTH (FIELD_TYPE (*field));
field++;
/* We assumed in the allocation above that there were four fields. */
gdb_assert (field == (field_list + 4));
- t = init_type (TYPE_CODE_STRUCT, offset, 0, 0, 0);
+ t = arch_type (arch, TYPE_CODE_STRUCT, offset, NULL);
TYPE_NFIELDS (t) = field - field_list;
TYPE_FIELDS (t) = field_list;
TYPE_TAG_NAME (t) = "gdb_gnu_v3_abi_vtable";
+ INIT_CPLUS_SPECIFIC (t);
return t;
}
+/* 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);
+}
+
/* 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 (void)
+vtable_address_point_offset (struct gdbarch *gdbarch)
{
- struct type *vtable_type = gdbarch_data (current_gdbarch,
- vtable_type_gdbarch_data);
+ struct type *vtable_type = gdbarch_data (gdbarch, vtable_type_gdbarch_data);
return (TYPE_FIELD_BITPOS (vtable_type, vtable_field_virtual_functions)
/ TARGET_CHAR_BIT);
gnuv3_rtti_type (struct value *value,
int *full_p, int *top_p, int *using_enc_p)
{
- struct type *vtable_type = gdbarch_data (current_gdbarch,
- vtable_type_gdbarch_data);
+ struct gdbarch *gdbarch;
+ struct type *vtable_type;
struct type *values_type = check_typedef (value_type (value));
CORE_ADDR vtable_address;
struct value *vtable;
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;
+ /* Determine architecture. */
+ gdbarch = get_type_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. */
- fill_in_vptr_fieldno (values_type);
- if (TYPE_VPTR_FIELDNO (values_type) == -1)
+ 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)
/* 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 (TYPE_VPTR_BASETYPE (values_type));
+ base_type = check_typedef (values_type_vptr_basetype);
if (values_type != base_type)
{
value = value_cast (base_type, value);
*using_enc_p = 1;
}
vtable_address
- = value_as_address (value_field (value, TYPE_VPTR_FIELDNO (values_type)));
- vtable = value_at_lazy (vtable_type,
- vtable_address - vtable_address_point_offset ());
+ = 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_offset (vtable)
+ = lookup_minimal_symbol_by_pc (value_address (vtable)
+ value_embedded_offset (vtable));
if (! vtable_symbol)
return NULL;
vtable type for this architecture. */
static struct value *
-gnuv3_get_vtable (struct value *container)
+gnuv3_get_vtable (struct gdbarch *gdbarch, struct value *container)
{
- struct type *vtable_type = gdbarch_data (current_gdbarch,
- vtable_type_gdbarch_data);
+ 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;
/* 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 ());
+ vtable_address - vtable_address_point_offset (gdbarch));
}
/* Return a function pointer for CONTAINER's VTABLE_INDEX'th virtual
function, of type FNTYPE. */
static struct value *
-gnuv3_get_virtual_fn (struct value *container, struct type *fntype,
- int vtable_index)
+gnuv3_get_virtual_fn (struct gdbarch *gdbarch, struct value *container,
+ struct type *fntype, int vtable_index)
{
- struct value *vtable = gnuv3_get_vtable (container);
+ struct value *vtable = gnuv3_get_vtable (gdbarch, container);
struct value *vfn;
/* Fetch the appropriate function pointer from the vtable. */
vfn = value_subscript (value_field (vtable, vtable_field_virtual_functions),
- value_from_longest (builtin_type_int, vtable_index));
+ vtable_index);
/* If this architecture uses function descriptors directly in the vtable,
then the address of the vtable entry is actually a "function pointer"
(i.e. points to the descriptor). We don't need to scale the index
by the size of a function descriptor; GCC does that before outputing
debug information. */
- if (gdbarch_vtable_function_descriptors (current_gdbarch))
+ if (gdbarch_vtable_function_descriptors (gdbarch))
vfn = value_addr (vfn);
/* Cast the function pointer to the appropriate type. */
struct type *vfn_base, int offset)
{
struct type *values_type = check_typedef (value_type (*value_p));
+ struct gdbarch *gdbarch;
/* Some simple sanity checks. */
if (TYPE_CODE (values_type) != TYPE_CODE_CLASS)
error (_("Only classes can have virtual functions."));
+ /* Determine architecture. */
+ gdbarch = get_type_arch (values_type);
+
/* Cast our value to the base class which defines this virtual
function. This takes care of any necessary `this'
adjustments. */
if (vfn_base != values_type)
*value_p = value_cast (vfn_base, *value_p);
- return gnuv3_get_virtual_fn (*value_p, TYPE_FN_FIELD_TYPE (f, j),
+ return gnuv3_get_virtual_fn (gdbarch, *value_p, TYPE_FN_FIELD_TYPE (f, j),
TYPE_FN_FIELD_VOFFSET (f, j));
}
gnuv3_baseclass_offset (struct type *type, int index, const bfd_byte *valaddr,
CORE_ADDR address)
{
- struct type *vtable_type = gdbarch_data (current_gdbarch,
- vtable_type_gdbarch_data);
+ struct gdbarch *gdbarch;
+ struct type *vtable_type;
+ struct type *ptr_type;
struct value *vtable;
struct type *vbasetype;
- struct value *offset_val, *vbase_array;
+ struct value *vbase_array;
CORE_ADDR vtable_address;
long int cur_base_offset, base_offset;
+ int vbasetype_vptr_fieldno;
+
+ /* Determine architecture. */
+ gdbarch = get_type_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. */
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 ())
+ 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 ();
- if ((- cur_base_offset) % TYPE_LENGTH (builtin_type_void_data_ptr) != 0)
+ 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 (builtin_type_void_data_ptr));
+ 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
start of whichever baseclass it resides in, as a sanity measure - iff
we have debugging information for that baseclass. */
- vbasetype = TYPE_VPTR_BASETYPE (type);
- if (TYPE_VPTR_FIELDNO (vbasetype) < 0)
- fill_in_vptr_fieldno (vbasetype);
+ vbasetype = check_typedef (TYPE_VPTR_BASETYPE (type));
+ vbasetype_vptr_fieldno = get_vptr_fieldno (vbasetype, NULL);
- if (TYPE_VPTR_FIELDNO (vbasetype) >= 0
- && TYPE_FIELD_BITPOS (vbasetype, TYPE_VPTR_FIELDNO (vbasetype)) != 0)
+ 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 (builtin_type_void_data_ptr,
- address));
- vtable = value_at_lazy (vtable_type,
- vtable_address - vtable_address_point_offset ());
- offset_val = value_from_longest(builtin_type_int, cur_base_offset);
+ vtable_address = value_as_address (value_at_lazy (ptr_type, address));
+ vtable
+ = value_at_lazy (vtable_type,
+ vtable_address - vtable_address_point_offset (gdbarch));
vbase_array = value_field (vtable, vtable_field_vcall_and_vbase_offsets);
- base_offset = value_as_long (value_subscript (vbase_array, offset_val));
+ base_offset = value_as_long (value_subscript (vbase_array, cur_base_offset));
return base_offset;
}
which has virtual table index VOFFSET. The method has an associated
"this" adjustment of ADJUSTMENT bytes. */
-const char *
+static const char *
gnuv3_find_method_in (struct type *domain, CORE_ADDR voffset,
LONGEST adjustment)
{
return NULL;
}
-/* GNU v3 implementation of cplus_print_method_ptr. */
+/* Decode GNU v3 method pointer. */
-static void
-gnuv3_print_method_ptr (const gdb_byte *contents,
- struct type *type,
- struct ui_file *stream)
+static int
+gnuv3_decode_method_ptr (struct gdbarch *gdbarch,
+ const gdb_byte *contents,
+ CORE_ADDR *value_p,
+ LONGEST *adjustment_p)
{
+ struct type *funcptr_type = builtin_type (gdbarch)->builtin_func_ptr;
+ struct type *offset_type = vtable_ptrdiff_type (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR ptr_value;
- LONGEST adjustment;
- struct type *domain;
+ LONGEST voffset, adjustment;
int vbit;
- domain = TYPE_DOMAIN_TYPE (type);
-
- /* Extract the pointer to member. */
- ptr_value = extract_typed_address (contents, builtin_type_void_func_ptr);
- contents += TYPE_LENGTH (builtin_type_void_func_ptr);
+ /* Extract the pointer to member. The first element is either a pointer
+ or a vtable offset. For pointers, we need to use extract_typed_address
+ to allow the back-end to convert the pointer to a GDB address -- but
+ vtable offsets we must handle as integers. At this point, we do not
+ yet know which case we have, so we extract the value under both
+ interpretations and choose the right one later on. */
+ ptr_value = extract_typed_address (contents, funcptr_type);
+ voffset = extract_signed_integer (contents,
+ TYPE_LENGTH (funcptr_type), byte_order);
+ contents += TYPE_LENGTH (funcptr_type);
adjustment = extract_signed_integer (contents,
- TYPE_LENGTH (builtin_type_long));
+ TYPE_LENGTH (offset_type), byte_order);
- if (!gdbarch_vbit_in_delta (current_gdbarch))
+ if (!gdbarch_vbit_in_delta (gdbarch))
{
- vbit = ptr_value & 1;
- ptr_value = ptr_value ^ vbit;
+ vbit = voffset & 1;
+ voffset = voffset ^ vbit;
}
else
{
adjustment = adjustment >> 1;
}
+ *value_p = vbit? voffset : ptr_value;
+ *adjustment_p = adjustment;
+ return vbit;
+}
+
+/* GNU v3 implementation of cplus_print_method_ptr. */
+
+static void
+gnuv3_print_method_ptr (const gdb_byte *contents,
+ struct type *type,
+ struct ui_file *stream)
+{
+ struct type *domain = TYPE_DOMAIN_TYPE (type);
+ struct gdbarch *gdbarch = get_type_arch (domain);
+ CORE_ADDR ptr_value;
+ LONGEST adjustment;
+ int vbit;
+
+ /* Extract the pointer to member. */
+ vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment);
+
/* Check for NULL. */
if (ptr_value == 0 && vbit == 0)
{
/* It's a virtual table offset, maybe in this class. Search
for a field with the correct vtable offset. First convert it
to an index, as used in TYPE_FN_FIELD_VOFFSET. */
- voffset = ptr_value / TYPE_LENGTH (builtin_type_long);
+ voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch));
physname = gnuv3_find_method_in (domain, voffset, adjustment);
print_longest (stream, 'd', 1, ptr_value);
}
else
- print_address_demangle (ptr_value, stream, demangle);
+ print_address_demangle (gdbarch, ptr_value, stream, demangle);
if (adjustment)
{
/* GNU v3 implementation of cplus_method_ptr_size. */
static int
-gnuv3_method_ptr_size (void)
+gnuv3_method_ptr_size (struct type *type)
{
- return 2 * TYPE_LENGTH (builtin_type_void_data_ptr);
+ struct type *domain_type = check_typedef (TYPE_DOMAIN_TYPE (type));
+ struct gdbarch *gdbarch = get_type_arch (domain_type);
+ return 2 * TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr);
}
/* GNU v3 implementation of cplus_make_method_ptr. */
static void
-gnuv3_make_method_ptr (gdb_byte *contents, CORE_ADDR value, int is_virtual)
+gnuv3_make_method_ptr (struct type *type, gdb_byte *contents,
+ CORE_ADDR value, int is_virtual)
{
- int size = TYPE_LENGTH (builtin_type_void_data_ptr);
+ struct type *domain_type = check_typedef (TYPE_DOMAIN_TYPE (type));
+ struct gdbarch *gdbarch = get_type_arch (domain_type);
+ int size = TYPE_LENGTH (builtin_type (gdbarch)->builtin_data_ptr);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* FIXME drow/2006-12-24: The adjustment of "this" is currently
always zero, since the method pointer is of the correct type.
support for adjusting pointers to members when casting them -
not currently supported by GDB. */
- if (!gdbarch_vbit_in_delta (current_gdbarch))
+ if (!gdbarch_vbit_in_delta (gdbarch))
{
- store_unsigned_integer (contents, size, value | is_virtual);
- store_unsigned_integer (contents + size, size, 0);
+ store_unsigned_integer (contents, size, byte_order, value | is_virtual);
+ store_unsigned_integer (contents + size, size, byte_order, 0);
}
else
{
- store_unsigned_integer (contents, size, value);
- store_unsigned_integer (contents + size, size, is_virtual);
+ store_unsigned_integer (contents, size, byte_order, value);
+ store_unsigned_integer (contents + size, size, byte_order, is_virtual);
}
}
static struct value *
gnuv3_method_ptr_to_value (struct value **this_p, struct value *method_ptr)
{
+ struct gdbarch *gdbarch;
const gdb_byte *contents = value_contents (method_ptr);
CORE_ADDR ptr_value;
- struct type *final_type, *method_type;
+ struct type *domain_type, *final_type, *method_type;
LONGEST adjustment;
- struct value *adjval;
int vbit;
- final_type = TYPE_DOMAIN_TYPE (check_typedef (value_type (method_ptr)));
- final_type = lookup_pointer_type (final_type);
+ domain_type = TYPE_DOMAIN_TYPE (check_typedef (value_type (method_ptr)));
+ final_type = lookup_pointer_type (domain_type);
method_type = TYPE_TARGET_TYPE (check_typedef (value_type (method_ptr)));
- ptr_value = extract_typed_address (contents, builtin_type_void_func_ptr);
- contents += TYPE_LENGTH (builtin_type_void_func_ptr);
- adjustment = extract_signed_integer (contents,
- TYPE_LENGTH (builtin_type_long));
-
- if (!gdbarch_vbit_in_delta (current_gdbarch))
- {
- vbit = ptr_value & 1;
- ptr_value = ptr_value ^ vbit;
- }
- else
- {
- vbit = adjustment & 1;
- adjustment = adjustment >> 1;
- }
+ /* Extract the pointer to member. */
+ gdbarch = get_type_arch (domain_type);
+ vbit = gnuv3_decode_method_ptr (gdbarch, contents, &ptr_value, &adjustment);
/* First convert THIS to match the containing type of the pointer to
member. This cast may adjust the value of THIS. */
You can provoke this case by casting a Base::* to a Derived::*, for
instance. */
- *this_p = value_cast (builtin_type_void_data_ptr, *this_p);
- adjval = value_from_longest (builtin_type_long, adjustment);
- *this_p = value_add (*this_p, adjval);
+ *this_p = value_cast (builtin_type (gdbarch)->builtin_data_ptr, *this_p);
+ *this_p = value_ptradd (*this_p, adjustment);
*this_p = value_cast (final_type, *this_p);
if (vbit)
{
- LONGEST voffset = ptr_value / TYPE_LENGTH (builtin_type_long);
- return gnuv3_get_virtual_fn (value_ind (*this_p), method_type, voffset);
+ LONGEST voffset;
+ voffset = ptr_value / TYPE_LENGTH (vtable_ptrdiff_type (gdbarch));
+ return gnuv3_get_virtual_fn (gdbarch, value_ind (*this_p),
+ method_type, voffset);
}
else
return value_from_pointer (lookup_pointer_type (method_type), ptr_value);
of the routine we are thunking to and continue to there instead. */
static CORE_ADDR
-gnuv3_skip_trampoline (CORE_ADDR stop_pc)
+gnuv3_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc)
{
CORE_ADDR real_stop_pc, method_stop_pc;
+ struct gdbarch *gdbarch = get_frame_arch (frame);
struct minimal_symbol *thunk_sym, *fn_sym;
struct obj_section *section;
char *thunk_name, *fn_name;
- real_stop_pc = gdbarch_skip_trampoline_code (current_gdbarch, stop_pc);
+ real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
if (real_stop_pc == 0)
real_stop_pc = stop_pc;
method_stop_pc = SYMBOL_VALUE_ADDRESS (fn_sym);
real_stop_pc = gdbarch_skip_trampoline_code
- (current_gdbarch, method_stop_pc);
+ (gdbarch, frame, method_stop_pc);
if (real_stop_pc == 0)
real_stop_pc = method_stop_pc;
return real_stop_pc;
}
+/* Return nonzero if a type should be passed by reference.
+
+ The rule in the v3 ABI document comes from section 3.1.1. If the
+ type has a non-trivial copy constructor or destructor, then the
+ caller must make a copy (by calling the copy constructor if there
+ is one or perform the copy itself otherwise), pass the address of
+ the copy, and then destroy the temporary (if necessary).
+
+ For return values with non-trivial copy constructors or
+ destructors, space will be allocated in the caller, and a pointer
+ will be passed as the first argument (preceding "this").
+
+ We don't have a bulletproof mechanism for determining whether a
+ constructor or destructor is trivial. For GCC and DWARF2 debug
+ information, we can check the artificial flag.
+
+ We don't do anything with the constructors or destructors,
+ but we have to get the argument passing right anyway. */
+static int
+gnuv3_pass_by_reference (struct type *type)
+{
+ int fieldnum, fieldelem;
+
+ CHECK_TYPEDEF (type);
+
+ /* We're only interested in things that can have methods. */
+ if (TYPE_CODE (type) != TYPE_CODE_STRUCT
+ && TYPE_CODE (type) != TYPE_CODE_CLASS
+ && TYPE_CODE (type) != TYPE_CODE_UNION)
+ return 0;
+
+ for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++)
+ for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum);
+ fieldelem++)
+ {
+ struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, fieldnum);
+ char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum);
+ struct type *fieldtype = TYPE_FN_FIELD_TYPE (fn, fieldelem);
+
+ /* If this function is marked as artificial, it is compiler-generated,
+ and we assume it is trivial. */
+ if (TYPE_FN_FIELD_ARTIFICIAL (fn, fieldelem))
+ continue;
+
+ /* If we've found a destructor, we must pass this by reference. */
+ if (name[0] == '~')
+ return 1;
+
+ /* If the mangled name of this method doesn't indicate that it
+ is a constructor, we're not interested.
+
+ FIXME drow/2007-09-23: We could do this using the name of
+ the method and the name of the class instead of dealing
+ with the mangled name. We don't have a convenient function
+ to strip off both leading scope qualifiers and trailing
+ template arguments yet. */
+ if (!is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem)))
+ continue;
+
+ /* If this method takes two arguments, and the second argument is
+ a reference to this class, then it is a copy constructor. */
+ if (TYPE_NFIELDS (fieldtype) == 2
+ && TYPE_CODE (TYPE_FIELD_TYPE (fieldtype, 1)) == TYPE_CODE_REF
+ && check_typedef (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (fieldtype, 1))) == type)
+ return 1;
+ }
+
+ /* Even if all the constructors and destructors were artificial, one
+ of them may have invoked a non-artificial constructor or
+ destructor in a base class. If any base class needs to be passed
+ by reference, so does this class. Similarly for members, which
+ are constructed whenever this class is. We do not need to worry
+ about recursive loops here, since we are only looking at members
+ of complete class type. */
+ for (fieldnum = 0; fieldnum < TYPE_NFIELDS (type); fieldnum++)
+ if (gnuv3_pass_by_reference (TYPE_FIELD_TYPE (type, fieldnum)))
+ return 1;
+
+ return 0;
+}
+
static void
init_gnuv3_ops (void)
{
gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr;
gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value;
gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline;
+ gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference;
}
extern initialize_file_ftype _initialize_gnu_v3_abi; /* -Wmissing-prototypes */
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