binutils-gdb/gdb/cp-abi.c

411 lines
10 KiB
C

/* Generic code for supporting multiple C++ ABI's
Copyright (C) 2001-2017 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 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "value.h"
#include "cp-abi.h"
#include "command.h"
#include "gdbcmd.h"
#include "ui-out.h"
static struct cp_abi_ops *find_cp_abi (const char *short_name);
static struct cp_abi_ops current_cp_abi = { "", NULL };
static struct cp_abi_ops auto_cp_abi = { "auto", NULL };
#define CP_ABI_MAX 8
static struct cp_abi_ops *cp_abis[CP_ABI_MAX];
static int num_cp_abis = 0;
enum ctor_kinds
is_constructor_name (const char *name)
{
if ((current_cp_abi.is_constructor_name) == NULL)
error (_("ABI doesn't define required function is_constructor_name"));
return (*current_cp_abi.is_constructor_name) (name);
}
enum dtor_kinds
is_destructor_name (const char *name)
{
if ((current_cp_abi.is_destructor_name) == NULL)
error (_("ABI doesn't define required function is_destructor_name"));
return (*current_cp_abi.is_destructor_name) (name);
}
int
is_vtable_name (const char *name)
{
if ((current_cp_abi.is_vtable_name) == NULL)
error (_("ABI doesn't define required function is_vtable_name"));
return (*current_cp_abi.is_vtable_name) (name);
}
int
is_operator_name (const char *name)
{
if ((current_cp_abi.is_operator_name) == NULL)
error (_("ABI doesn't define required function is_operator_name"));
return (*current_cp_abi.is_operator_name) (name);
}
int
baseclass_offset (struct type *type, int index, const gdb_byte *valaddr,
LONGEST embedded_offset, CORE_ADDR address,
const struct value *val)
{
int res = 0;
gdb_assert (current_cp_abi.baseclass_offset != NULL);
TRY
{
res = (*current_cp_abi.baseclass_offset) (type, index, valaddr,
embedded_offset,
address, val);
}
CATCH (ex, RETURN_MASK_ERROR)
{
if (ex.error != NOT_AVAILABLE_ERROR)
throw_exception (ex);
throw_error (NOT_AVAILABLE_ERROR,
_("Cannot determine virtual baseclass offset "
"of incomplete object"));
}
END_CATCH
return res;
}
struct value *
value_virtual_fn_field (struct value **arg1p,
struct fn_field *f, int j,
struct type *type, int offset)
{
if ((current_cp_abi.virtual_fn_field) == NULL)
return NULL;
return (*current_cp_abi.virtual_fn_field) (arg1p, f, j,
type, offset);
}
struct type *
value_rtti_type (struct value *v, int *full,
LONGEST *top, int *using_enc)
{
struct type *ret = NULL;
if ((current_cp_abi.rtti_type) == NULL)
return NULL;
TRY
{
ret = (*current_cp_abi.rtti_type) (v, full, top, using_enc);
}
CATCH (e, RETURN_MASK_ERROR)
{
return NULL;
}
END_CATCH
return ret;
}
void
cplus_print_method_ptr (const gdb_byte *contents,
struct type *type,
struct ui_file *stream)
{
if (current_cp_abi.print_method_ptr == NULL)
error (_("GDB does not support pointers to methods on this target"));
(*current_cp_abi.print_method_ptr) (contents, type, stream);
}
int
cplus_method_ptr_size (struct type *to_type)
{
if (current_cp_abi.method_ptr_size == NULL)
error (_("GDB does not support pointers to methods on this target"));
return (*current_cp_abi.method_ptr_size) (to_type);
}
void
cplus_make_method_ptr (struct type *type, gdb_byte *contents,
CORE_ADDR value, int is_virtual)
{
if (current_cp_abi.make_method_ptr == NULL)
error (_("GDB does not support pointers to methods on this target"));
(*current_cp_abi.make_method_ptr) (type, contents, value, is_virtual);
}
CORE_ADDR
cplus_skip_trampoline (struct frame_info *frame,
CORE_ADDR stop_pc)
{
if (current_cp_abi.skip_trampoline == NULL)
return 0;
return (*current_cp_abi.skip_trampoline) (frame, stop_pc);
}
struct value *
cplus_method_ptr_to_value (struct value **this_p,
struct value *method_ptr)
{
if (current_cp_abi.method_ptr_to_value == NULL)
error (_("GDB does not support pointers to methods on this target"));
return (*current_cp_abi.method_ptr_to_value) (this_p, method_ptr);
}
/* See cp-abi.h. */
void
cplus_print_vtable (struct value *value)
{
if (current_cp_abi.print_vtable == NULL)
error (_("GDB cannot print the vtable on this target"));
(*current_cp_abi.print_vtable) (value);
}
/* See cp-abi.h. */
struct value *
cplus_typeid (struct value *value)
{
if (current_cp_abi.get_typeid == NULL)
error (_("GDB cannot find the typeid on this target"));
return (*current_cp_abi.get_typeid) (value);
}
/* See cp-abi.h. */
struct type *
cplus_typeid_type (struct gdbarch *gdbarch)
{
if (current_cp_abi.get_typeid_type == NULL)
error (_("GDB cannot find the type for 'typeid' on this target"));
return (*current_cp_abi.get_typeid_type) (gdbarch);
}
/* See cp-abi.h. */
struct type *
cplus_type_from_type_info (struct value *value)
{
if (current_cp_abi.get_type_from_type_info == NULL)
error (_("GDB cannot find the type from a std::type_info on this target"));
return (*current_cp_abi.get_type_from_type_info) (value);
}
/* See cp-abi.h. */
std::string
cplus_typename_from_type_info (struct value *value)
{
if (current_cp_abi.get_typename_from_type_info == NULL)
error (_("GDB cannot find the type name "
"from a std::type_info on this target"));
return (*current_cp_abi.get_typename_from_type_info) (value);
}
int
cp_pass_by_reference (struct type *type)
{
if ((current_cp_abi.pass_by_reference) == NULL)
return 0;
return (*current_cp_abi.pass_by_reference) (type);
}
/* Set the current C++ ABI to SHORT_NAME. */
static int
switch_to_cp_abi (const char *short_name)
{
struct cp_abi_ops *abi;
abi = find_cp_abi (short_name);
if (abi == NULL)
return 0;
current_cp_abi = *abi;
return 1;
}
/* Add ABI to the list of supported C++ ABI's. */
int
register_cp_abi (struct cp_abi_ops *abi)
{
if (num_cp_abis == CP_ABI_MAX)
internal_error (__FILE__, __LINE__,
_("Too many C++ ABIs, please increase "
"CP_ABI_MAX in cp-abi.c"));
cp_abis[num_cp_abis++] = abi;
return 1;
}
/* Set the ABI to use in "auto" mode to SHORT_NAME. */
void
set_cp_abi_as_auto_default (const char *short_name)
{
char *new_longname, *new_doc;
struct cp_abi_ops *abi = find_cp_abi (short_name);
if (abi == NULL)
internal_error (__FILE__, __LINE__,
_("Cannot find C++ ABI \"%s\" to set it as auto default."),
short_name);
if (auto_cp_abi.longname != NULL)
xfree ((char *) auto_cp_abi.longname);
if (auto_cp_abi.doc != NULL)
xfree ((char *) auto_cp_abi.doc);
auto_cp_abi = *abi;
auto_cp_abi.shortname = "auto";
new_longname = xstrprintf ("currently \"%s\"", abi->shortname);
auto_cp_abi.longname = new_longname;
new_doc = xstrprintf ("Automatically selected; currently \"%s\"",
abi->shortname);
auto_cp_abi.doc = new_doc;
/* Since we copy the current ABI into current_cp_abi instead of
using a pointer, if auto is currently the default, we need to
reset it. */
if (strcmp (current_cp_abi.shortname, "auto") == 0)
switch_to_cp_abi ("auto");
}
/* Return the ABI operations associated with SHORT_NAME. */
static struct cp_abi_ops *
find_cp_abi (const char *short_name)
{
int i;
for (i = 0; i < num_cp_abis; i++)
if (strcmp (cp_abis[i]->shortname, short_name) == 0)
return cp_abis[i];
return NULL;
}
/* Display the list of registered C++ ABIs. */
static void
list_cp_abis (int from_tty)
{
struct ui_out *uiout = current_uiout;
int i;
uiout->text ("The available C++ ABIs are:\n");
ui_out_emit_tuple tuple_emitter (uiout, "cp-abi-list");
for (i = 0; i < num_cp_abis; i++)
{
char pad[14];
int padcount;
uiout->text (" ");
uiout->field_string ("cp-abi", cp_abis[i]->shortname);
padcount = 16 - 2 - strlen (cp_abis[i]->shortname);
pad[padcount] = 0;
while (padcount > 0)
pad[--padcount] = ' ';
uiout->text (pad);
uiout->field_string ("doc", cp_abis[i]->doc);
uiout->text ("\n");
}
}
/* Set the current C++ ABI, or display the list of options if no
argument is given. */
static void
set_cp_abi_cmd (const char *args, int from_tty)
{
if (args == NULL)
{
list_cp_abis (from_tty);
return;
}
if (!switch_to_cp_abi (args))
error (_("Could not find \"%s\" in ABI list"), args);
}
/* A completion function for "set cp-abi". */
static void
cp_abi_completer (struct cmd_list_element *ignore,
completion_tracker &tracker,
const char *text, const char *word)
{
static const char **cp_abi_names;
if (cp_abi_names == NULL)
{
int i;
cp_abi_names = XNEWVEC (const char *, num_cp_abis + 1);
for (i = 0; i < num_cp_abis; ++i)
cp_abi_names[i] = cp_abis[i]->shortname;
cp_abi_names[i] = NULL;
}
complete_on_enum (tracker, cp_abi_names, text, word);
}
/* Show the currently selected C++ ABI. */
static void
show_cp_abi_cmd (const char *args, int from_tty)
{
struct ui_out *uiout = current_uiout;
uiout->text ("The currently selected C++ ABI is \"");
uiout->field_string ("cp-abi", current_cp_abi.shortname);
uiout->text ("\" (");
uiout->field_string ("longname", current_cp_abi.longname);
uiout->text (").\n");
}
void
_initialize_cp_abi (void)
{
struct cmd_list_element *c;
register_cp_abi (&auto_cp_abi);
switch_to_cp_abi ("auto");
c = add_cmd ("cp-abi", class_obscure, set_cp_abi_cmd, _("\
Set the ABI used for inspecting C++ objects.\n\
\"set cp-abi\" with no arguments will list the available ABIs."),
&setlist);
set_cmd_completer (c, cp_abi_completer);
add_cmd ("cp-abi", class_obscure, show_cp_abi_cmd,
_("Show the ABI used for inspecting C++ objects."),
&showlist);
}