/* Generic code for supporting multiple C++ ABI's Copyright (C) 2001-2019 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 . */ #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 (const gdb_exception_error &ex) { if (ex.error != NOT_AVAILABLE_ERROR) throw_exception (ex); throw_error (NOT_AVAILABLE_ERROR, _("Cannot determine virtual baseclass offset " "of incomplete object")); } 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 (const gdb_exception_error &e) { return NULL; } 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); }