/* Some code common to C++ and ObjC++ front ends. Copyright (C) 2004-2014 Free Software Foundation, Inc. Contributed by Ziemowit Laski 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 3, 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 COPYING3. If not see . */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "cp-tree.h" #include "c-family/c-common.h" #include "langhooks.h" #include "langhooks-def.h" #include "diagnostic.h" #include "debug.h" #include "cxx-pretty-print.h" #include "cp-objcp-common.h" #include // For placement new. /* Special routine to get the alias set for C++. */ alias_set_type 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)); /* Punt on PMFs until we canonicalize functions properly. */ if (TYPE_PTRMEMFUNC_P (t) || (POINTER_TYPE_P (t) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))) return 0; return c_common_get_alias_set (t); } /* Called from check_global_declarations. */ bool cxx_warn_unused_global_decl (const_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 (VAR_P (decl) && TREE_READONLY (decl)) return false; return true; } /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */ 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 DEFERRED_NOEXCEPT: return sizeof (struct tree_deferred_noexcept); case OVERLOAD: return sizeof (struct tree_overload); case STATIC_ASSERT: return sizeof (struct tree_static_assert); case TYPE_ARGUMENT_PACK: case TYPE_PACK_EXPANSION: return sizeof (struct tree_common); case NONTYPE_ARGUMENT_PACK: case EXPR_PACK_EXPANSION: return sizeof (struct tree_exp); case ARGUMENT_PACK_SELECT: return sizeof (struct tree_argument_pack_select); case TRAIT_EXPR: return sizeof (struct tree_trait_expr); case LAMBDA_EXPR: return sizeof (struct tree_lambda_expr); case TEMPLATE_INFO: return sizeof (struct tree_template_info); case USERDEF_LITERAL: return sizeof (struct tree_userdef_literal); default: gcc_unreachable (); } /* NOTREACHED */ } /* Returns true if T is a variably modified type, in the sense of C99. FN is as passed to variably_modified_p. This routine needs only check cases that cannot be handled by the language-independent logic in tree.c. */ bool cp_var_mod_type_p (tree type, tree fn) { /* If TYPE is a pointer-to-member, it is variably modified if either the class or the member are variably modified. */ if (TYPE_PTRMEM_P (type)) return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn) || variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type), fn)); /* 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. */ void cxx_initialize_diagnostics (diagnostic_context *context) { c_common_initialize_diagnostics (context); pretty_printer *base = context->printer; cxx_pretty_printer *pp = XNEW (cxx_pretty_printer); context->printer = new (pp) cxx_pretty_printer (); /* It is safe to free this object because it was previously XNEW()'d. */ base->~pretty_printer (); XDELETE (base); } /* This compares two types for equivalence ("compatible" in C-based languages). This routine should only return 1 if it is sure. It should not be used in contexts where erroneously returning 0 causes problems. */ int cxx_types_compatible_p (tree x, tree y) { return same_type_ignoring_top_level_qualifiers_p (x, y); } /* Return true if DECL is explicit member function. */ bool cp_function_decl_explicit_p (tree decl) { return (decl && DECL_LANG_SPECIFIC (STRIP_TEMPLATE (decl)) && DECL_NONCONVERTING_P (decl)); } /* Stubs to keep c-opts.c happy. */ void push_file_scope (void) { } void pop_file_scope (void) { } /* c-pragma.c needs to query whether a decl has extern "C" linkage. */ bool has_c_linkage (const_tree decl) { return DECL_EXTERN_C_P (decl); } static GTY ((if_marked ("tree_decl_map_marked_p"), param_is (struct tree_decl_map))) htab_t shadowed_var_for_decl; /* Lookup a shadowed var for FROM, and return it if we find one. */ tree decl_shadowed_for_var_lookup (tree from) { struct tree_decl_map *h, in; in.base.from = from; h = (struct tree_decl_map *) htab_find_with_hash (shadowed_var_for_decl, &in, DECL_UID (from)); if (h) return h->to; return NULL_TREE; } /* Insert a mapping FROM->TO in the shadowed var hashtable. */ void decl_shadowed_for_var_insert (tree from, tree to) { struct tree_decl_map *h; void **loc; h = ggc_alloc_tree_decl_map (); h->base.from = from; h->to = to; loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, DECL_UID (from), INSERT); *(struct tree_decl_map **) loc = h; } void init_shadowed_var_for_decl (void) { shadowed_var_for_decl = htab_create_ggc (512, tree_decl_map_hash, tree_decl_map_eq, 0); } /* Return true if stmt can fall through. Used by block_may_fallthru default case. */ bool cxx_block_may_fallthru (const_tree stmt) { switch (TREE_CODE (stmt)) { case EXPR_STMT: return block_may_fallthru (EXPR_STMT_EXPR (stmt)); case THROW_EXPR: return false; default: return true; } } void cp_common_init_ts (void) { MARK_TS_DECL_NON_COMMON (NAMESPACE_DECL); MARK_TS_DECL_NON_COMMON (USING_DECL); MARK_TS_DECL_NON_COMMON (TEMPLATE_DECL); MARK_TS_COMMON (TEMPLATE_TEMPLATE_PARM); MARK_TS_COMMON (TEMPLATE_TYPE_PARM); MARK_TS_COMMON (TEMPLATE_PARM_INDEX); MARK_TS_COMMON (OVERLOAD); MARK_TS_COMMON (TEMPLATE_INFO); MARK_TS_COMMON (TYPENAME_TYPE); MARK_TS_COMMON (TYPEOF_TYPE); MARK_TS_COMMON (UNDERLYING_TYPE); MARK_TS_COMMON (BASELINK); MARK_TS_COMMON (TYPE_PACK_EXPANSION); MARK_TS_COMMON (TYPE_ARGUMENT_PACK); MARK_TS_COMMON (DECLTYPE_TYPE); MARK_TS_COMMON (BOUND_TEMPLATE_TEMPLATE_PARM); MARK_TS_COMMON (UNBOUND_CLASS_TEMPLATE); MARK_TS_TYPED (EXPR_PACK_EXPANSION); MARK_TS_TYPED (SWITCH_STMT); MARK_TS_TYPED (IF_STMT); MARK_TS_TYPED (FOR_STMT); MARK_TS_TYPED (RANGE_FOR_STMT); MARK_TS_TYPED (AGGR_INIT_EXPR); MARK_TS_TYPED (EXPR_STMT); MARK_TS_TYPED (EH_SPEC_BLOCK); MARK_TS_TYPED (CLEANUP_STMT); MARK_TS_TYPED (SCOPE_REF); MARK_TS_TYPED (CAST_EXPR); MARK_TS_TYPED (NON_DEPENDENT_EXPR); MARK_TS_TYPED (MODOP_EXPR); MARK_TS_TYPED (TRY_BLOCK); MARK_TS_TYPED (THROW_EXPR); MARK_TS_TYPED (HANDLER); MARK_TS_TYPED (REINTERPRET_CAST_EXPR); MARK_TS_TYPED (CONST_CAST_EXPR); MARK_TS_TYPED (STATIC_CAST_EXPR); MARK_TS_TYPED (DYNAMIC_CAST_EXPR); MARK_TS_TYPED (IMPLICIT_CONV_EXPR); MARK_TS_TYPED (TEMPLATE_ID_EXPR); MARK_TS_TYPED (ARROW_EXPR); MARK_TS_TYPED (SIZEOF_EXPR); MARK_TS_TYPED (ALIGNOF_EXPR); MARK_TS_TYPED (AT_ENCODE_EXPR); MARK_TS_TYPED (UNARY_PLUS_EXPR); MARK_TS_TYPED (TRAIT_EXPR); MARK_TS_TYPED (TYPE_ARGUMENT_PACK); MARK_TS_TYPED (NOEXCEPT_EXPR); MARK_TS_TYPED (NONTYPE_ARGUMENT_PACK); MARK_TS_TYPED (WHILE_STMT); MARK_TS_TYPED (NEW_EXPR); MARK_TS_TYPED (VEC_NEW_EXPR); MARK_TS_TYPED (BREAK_STMT); MARK_TS_TYPED (MEMBER_REF); MARK_TS_TYPED (DOTSTAR_EXPR); MARK_TS_TYPED (DO_STMT); MARK_TS_TYPED (DELETE_EXPR); MARK_TS_TYPED (VEC_DELETE_EXPR); MARK_TS_TYPED (CONTINUE_STMT); MARK_TS_TYPED (TAG_DEFN); MARK_TS_TYPED (PSEUDO_DTOR_EXPR); MARK_TS_TYPED (TYPEID_EXPR); MARK_TS_TYPED (MUST_NOT_THROW_EXPR); MARK_TS_TYPED (STMT_EXPR); MARK_TS_TYPED (OFFSET_REF); MARK_TS_TYPED (OFFSETOF_EXPR); MARK_TS_TYPED (PTRMEM_CST); MARK_TS_TYPED (EMPTY_CLASS_EXPR); MARK_TS_TYPED (VEC_INIT_EXPR); MARK_TS_TYPED (USING_STMT); MARK_TS_TYPED (LAMBDA_EXPR); MARK_TS_TYPED (CTOR_INITIALIZER); MARK_TS_TYPED (ARRAY_NOTATION_REF); } #include "gt-cp-cp-objcp-common.h"