/* Language-dependent hooks for C++. Copyright 2001, 2002, 2004 Free Software Foundation, Inc. Contributed by Alexandre Oliva This file is part of GCC. GCC 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, or (at your option) any later version. GCC 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 GCC; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "cp-tree.h" #include "c-common.h" #include "toplev.h" #include "langhooks.h" #include "langhooks-def.h" #include "diagnostic.h" #include "cxx-pretty-print.h" enum c_language_kind c_language = clk_cxx; static HOST_WIDE_INT cxx_get_alias_set (tree); static bool ok_to_generate_alias_set_for_type (tree); static bool cxx_warn_unused_global_decl (tree); static tree cp_expr_size (tree); static size_t cp_tree_size (enum tree_code); static bool cp_var_mod_type_p (tree); static void cxx_initialize_diagnostics (diagnostic_context *); #undef LANG_HOOKS_NAME #define LANG_HOOKS_NAME "GNU C++" #undef LANG_HOOKS_TREE_SIZE #define LANG_HOOKS_TREE_SIZE cp_tree_size #undef LANG_HOOKS_INIT #define LANG_HOOKS_INIT cxx_init #undef LANG_HOOKS_FINISH #define LANG_HOOKS_FINISH cxx_finish #undef LANG_HOOKS_CLEAR_BINDING_STACK #define LANG_HOOKS_CLEAR_BINDING_STACK pop_everything #undef LANG_HOOKS_INIT_OPTIONS #define LANG_HOOKS_INIT_OPTIONS c_common_init_options #undef LANG_HOOKS_INITIALIZE_DIAGNOSTICS #define LANG_HOOKS_INITIALIZE_DIAGNOSTICS cxx_initialize_diagnostics #undef LANG_HOOKS_HANDLE_OPTION #define LANG_HOOKS_HANDLE_OPTION c_common_handle_option #undef LANG_HOOKS_HANDLE_FILENAME #define LANG_HOOKS_HANDLE_FILENAME c_common_handle_filename #undef LANG_HOOKS_MISSING_ARGUMENT #define LANG_HOOKS_MISSING_ARGUMENT c_common_missing_argument #undef LANG_HOOKS_POST_OPTIONS #define LANG_HOOKS_POST_OPTIONS c_common_post_options #undef LANG_HOOKS_GET_ALIAS_SET #define LANG_HOOKS_GET_ALIAS_SET cxx_get_alias_set #undef LANG_HOOKS_EXPAND_CONSTANT #define LANG_HOOKS_EXPAND_CONSTANT cplus_expand_constant #undef LANG_HOOKS_EXPAND_EXPR #define LANG_HOOKS_EXPAND_EXPR cxx_expand_expr #undef LANG_HOOKS_SAFE_FROM_P #define LANG_HOOKS_SAFE_FROM_P c_safe_from_p #undef LANG_HOOKS_PARSE_FILE #define LANG_HOOKS_PARSE_FILE c_common_parse_file #undef LANG_HOOKS_DUP_LANG_SPECIFIC_DECL #define LANG_HOOKS_DUP_LANG_SPECIFIC_DECL cxx_dup_lang_specific_decl #undef LANG_HOOKS_UNSAVE_EXPR_NOW #define LANG_HOOKS_UNSAVE_EXPR_NOW cxx_unsave_expr_now #undef LANG_HOOKS_MAYBE_BUILD_CLEANUP #define LANG_HOOKS_MAYBE_BUILD_CLEANUP cxx_maybe_build_cleanup #undef LANG_HOOKS_TRUTHVALUE_CONVERSION #define LANG_HOOKS_TRUTHVALUE_CONVERSION c_common_truthvalue_conversion #undef LANG_HOOKS_UNSAFE_FOR_REEVAL #define LANG_HOOKS_UNSAFE_FOR_REEVAL c_common_unsafe_for_reeval #undef LANG_HOOKS_SET_DECL_ASSEMBLER_NAME #define LANG_HOOKS_SET_DECL_ASSEMBLER_NAME mangle_decl #undef LANG_HOOKS_MARK_ADDRESSABLE #define LANG_HOOKS_MARK_ADDRESSABLE cxx_mark_addressable #undef LANG_HOOKS_PRINT_STATISTICS #define LANG_HOOKS_PRINT_STATISTICS cxx_print_statistics #undef LANG_HOOKS_PRINT_XNODE #define LANG_HOOKS_PRINT_XNODE cxx_print_xnode #undef LANG_HOOKS_PRINT_DECL #define LANG_HOOKS_PRINT_DECL cxx_print_decl #undef LANG_HOOKS_PRINT_TYPE #define LANG_HOOKS_PRINT_TYPE cxx_print_type #undef LANG_HOOKS_PRINT_IDENTIFIER #define LANG_HOOKS_PRINT_IDENTIFIER cxx_print_identifier #undef LANG_HOOKS_DECL_PRINTABLE_NAME #define LANG_HOOKS_DECL_PRINTABLE_NAME cxx_printable_name #undef LANG_HOOKS_PRINT_ERROR_FUNCTION #define LANG_HOOKS_PRINT_ERROR_FUNCTION cxx_print_error_function #undef LANG_HOOKS_PUSHLEVEL #define LANG_HOOKS_PUSHLEVEL lhd_do_nothing_i #undef LANG_HOOKS_POPLEVEL #define LANG_HOOKS_POPLEVEL lhd_do_nothing_iii_return_null_tree #undef LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL #define LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL cxx_warn_unused_global_decl #undef LANG_HOOKS_WRITE_GLOBALS #define LANG_HOOKS_WRITE_GLOBALS lhd_do_nothing #undef LANG_HOOKS_DECL_UNINIT #define LANG_HOOKS_DECL_UNINIT c_decl_uninit #undef LANG_HOOKS_UPDATE_DECL_AFTER_SAVING #define LANG_HOOKS_UPDATE_DECL_AFTER_SAVING cp_update_decl_after_saving #undef LANG_HOOKS_FUNCTION_INIT #define LANG_HOOKS_FUNCTION_INIT cxx_push_function_context #undef LANG_HOOKS_FUNCTION_FINAL #define LANG_HOOKS_FUNCTION_FINAL cxx_pop_function_context #undef LANG_HOOKS_RTL_EXPAND_START #define LANG_HOOKS_RTL_EXPAND_START cxx_expand_function_start #undef LANG_HOOKS_RTL_EXPAND_STMT #define LANG_HOOKS_RTL_EXPAND_STMT expand_stmt /* Attribute hooks. */ #undef LANG_HOOKS_COMMON_ATTRIBUTE_TABLE #define LANG_HOOKS_COMMON_ATTRIBUTE_TABLE c_common_attribute_table #undef LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE #define LANG_HOOKS_FORMAT_ATTRIBUTE_TABLE c_common_format_attribute_table #undef LANG_HOOKS_ATTRIBUTE_TABLE #define LANG_HOOKS_ATTRIBUTE_TABLE cxx_attribute_table #undef LANG_HOOKS_TREE_INLINING_WALK_SUBTREES #define LANG_HOOKS_TREE_INLINING_WALK_SUBTREES \ cp_walk_subtrees #undef LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN #define LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN \ cp_cannot_inline_tree_fn #undef LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS #define LANG_HOOKS_TREE_INLINING_ADD_PENDING_FN_DECLS \ cp_add_pending_fn_decls #undef LANG_HOOKS_TREE_INLINING_TREE_CHAIN_MATTERS_P #define LANG_HOOKS_TREE_INLINING_TREE_CHAIN_MATTERS_P \ cp_is_overload_p #undef LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P #define LANG_HOOKS_TREE_INLINING_AUTO_VAR_IN_FN_P \ cp_auto_var_in_fn_p #undef LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING #define LANG_HOOKS_TREE_INLINING_COPY_RES_DECL_FOR_INLINING \ cp_copy_res_decl_for_inlining #undef LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P #define LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P anon_aggr_type_p #undef LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P #define LANG_HOOKS_TREE_INLINING_VAR_MOD_TYPE_P cp_var_mod_type_p #undef LANG_HOOKS_TREE_INLINING_ESTIMATE_NUM_INSNS #define LANG_HOOKS_TREE_INLINING_ESTIMATE_NUM_INSNS c_estimate_num_insns #undef LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN #define LANG_HOOKS_TREE_DUMP_DUMP_TREE_FN cp_dump_tree #undef LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN #define LANG_HOOKS_TREE_DUMP_TYPE_QUALS_FN cp_type_quals #undef LANG_HOOKS_EXPR_SIZE #define LANG_HOOKS_EXPR_SIZE cp_expr_size #undef LANG_HOOKS_CALLGRAPH_ANALYZE_EXPR #define LANG_HOOKS_CALLGRAPH_ANALYZE_EXPR cxx_callgraph_analyze_expr #undef LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION #define LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION expand_body #undef LANG_HOOKS_MAKE_TYPE #define LANG_HOOKS_MAKE_TYPE cxx_make_type #undef LANG_HOOKS_TYPE_FOR_MODE #define LANG_HOOKS_TYPE_FOR_MODE c_common_type_for_mode #undef LANG_HOOKS_TYPE_FOR_SIZE #define LANG_HOOKS_TYPE_FOR_SIZE c_common_type_for_size #undef LANG_HOOKS_SIGNED_TYPE #define LANG_HOOKS_SIGNED_TYPE c_common_signed_type #undef LANG_HOOKS_UNSIGNED_TYPE #define LANG_HOOKS_UNSIGNED_TYPE c_common_unsigned_type #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE c_common_signed_or_unsigned_type #undef LANG_HOOKS_INCOMPLETE_TYPE_ERROR #define LANG_HOOKS_INCOMPLETE_TYPE_ERROR cxx_incomplete_type_error #undef LANG_HOOKS_TYPE_PROMOTES_TO #define LANG_HOOKS_TYPE_PROMOTES_TO cxx_type_promotes_to #undef LANG_HOOKS_REGISTER_BUILTIN_TYPE #define LANG_HOOKS_REGISTER_BUILTIN_TYPE c_register_builtin_type /* Each front end provides its own hooks, for toplev.c. */ const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER; /* Tree code classes. */ #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE, const char tree_code_type[] = { #include "tree.def" 'x', #include "c-common.def" 'x', #include "cp-tree.def" }; #undef DEFTREECODE /* Table indexed by tree code giving number of expression operands beyond the fixed part of the node structure. Not used for types or decls. */ #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH, const unsigned char tree_code_length[] = { #include "tree.def" 0, #include "c-common.def" 0, #include "cp-tree.def" }; #undef DEFTREECODE /* Names of tree components. Used for printing out the tree and error messages. */ #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME, const char *const tree_code_name[] = { #include "tree.def" "@@dummy", #include "c-common.def" "@@dummy", #include "cp-tree.def" }; #undef DEFTREECODE /* Check if a C++ type is safe for aliasing. Return TRUE if T safe for aliasing FALSE otherwise. */ static bool ok_to_generate_alias_set_for_type (tree t) { if (TYPE_PTRMEMFUNC_P (t)) return true; if (AGGREGATE_TYPE_P (t)) { if ((TREE_CODE (t) == RECORD_TYPE) || (TREE_CODE (t) == UNION_TYPE)) { tree fields; /* Backend-created structs are safe. */ if (! CLASS_TYPE_P (t)) return true; /* PODs are safe. */ if (! CLASSTYPE_NON_POD_P(t)) return true; /* Classes with virtual baseclasses are not. */ if (TYPE_USES_VIRTUAL_BASECLASSES (t)) return false; /* Recursively check the base classes. */ if (TYPE_BINFO (t) != NULL && TYPE_BINFO_BASETYPES (t) != NULL) { int i; for (i = 0; i < TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (t)); i++) { tree binfo = TREE_VEC_ELT (TYPE_BINFO_BASETYPES (t), i); if (!ok_to_generate_alias_set_for_type (BINFO_TYPE (binfo))) return false; } } /* Check all the fields. */ for (fields = TYPE_FIELDS (t); fields; fields = TREE_CHAIN (fields)) { if (TREE_CODE (fields) != FIELD_DECL) continue; if (! ok_to_generate_alias_set_for_type (TREE_TYPE (fields))) return false; } return true; } else if (TREE_CODE (t) == ARRAY_TYPE) return ok_to_generate_alias_set_for_type (TREE_TYPE (t)); else /* This should never happen, we dealt with all the aggregate types that can appear in C++ above. */ abort (); } else return true; } /* Special routine to get the alias set for C++. */ static HOST_WIDE_INT cxx_get_alias_set (tree t) { if (IS_FAKE_BASE_TYPE (t)) /* The base variant of a type must be in the same alias set as the complete type. */ return get_alias_set (TYPE_CONTEXT (t)); if (/* It's not yet safe to use alias sets for some classes in C++. */ !ok_to_generate_alias_set_for_type (t) /* Nor is it safe to use alias sets for pointers-to-member functions, due to the fact that there may be more than one RECORD_TYPE type corresponding to the same pointer-to-member type. */ || TYPE_PTRMEMFUNC_P (t)) return 0; return c_common_get_alias_set (t); } /* Called from check_global_declarations. */ static bool cxx_warn_unused_global_decl (tree decl) { if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)) return false; if (DECL_IN_SYSTEM_HEADER (decl)) return false; /* Const variables take the place of #defines in C++. */ if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl)) return false; return true; } /* Langhook for expr_size: Tell the backend that the value of an expression of non-POD class type does not include any tail padding; a derived class might have allocated something there. */ static tree cp_expr_size (tree exp) { if (CLASS_TYPE_P (TREE_TYPE (exp))) { /* The backend should not be interested in the size of an expression of a type with both of these set; all copies of such types must go through a constructor or assignment op. */ if (TYPE_HAS_COMPLEX_INIT_REF (TREE_TYPE (exp)) && TYPE_HAS_COMPLEX_ASSIGN_REF (TREE_TYPE (exp)) /* But storing a CONSTRUCTOR isn't a copy. */ && TREE_CODE (exp) != CONSTRUCTOR) abort (); /* This would be wrong for a type with virtual bases, but they are caught by the abort above. */ return (is_empty_class (TREE_TYPE (exp)) ? size_zero_node : CLASSTYPE_SIZE_UNIT (TREE_TYPE (exp))); } else /* Use the default code. */ return lhd_expr_size (exp); } /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */ static size_t cp_tree_size (enum tree_code code) { switch (code) { case PTRMEM_CST: return sizeof (struct ptrmem_cst); case BASELINK: return sizeof (struct tree_baselink); case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index); case DEFAULT_ARG: return sizeof (struct tree_default_arg); case OVERLOAD: return sizeof (struct tree_overload); default: abort (); } /* NOTREACHED */ } /* Returns true if T is a variably modified type, in the sense of C99. This routine needs only check cases that cannot be handled by the language-independent logic in tree-inline.c. */ static bool cp_var_mod_type_p (tree type) { /* If TYPE is a pointer-to-member, it is variably modified if either the class or the member are variably modified. */ if (TYPE_PTR_TO_MEMBER_P (type)) return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type)) || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type))); /* All other types are not variably modified. */ return false; } /* Construct a C++-aware pretty-printer for CONTEXT. It is assumed that CONTEXT->printer is an already constructed basic pretty_printer. */ static void cxx_initialize_diagnostics (diagnostic_context *context) { pretty_printer *base = context->printer; cxx_pretty_printer *pp = xmalloc (sizeof (cxx_pretty_printer)); memcpy (pp_base (pp), base, sizeof (pretty_printer)); pp_cxx_pretty_printer_init (pp); context->printer = (pretty_printer *) pp; /* It is safe to free this object because it was previously malloc()'d. */ free (base); } /* Stubs to keep c-opts.c happy. */ void push_file_scope (void) { } void pop_file_scope (void) { }