318 lines
8.5 KiB
C
318 lines
8.5 KiB
C
/* Some code common to C++ and ObjC++ front ends.
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Copyright (C) 2004-2015 Free Software Foundation, Inc.
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Contributed by Ziemowit Laski <zlaski@apple.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "alias.h"
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#include "symtab.h"
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#include "tree.h"
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#include "cp-tree.h"
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#include "c-family/c-common.h"
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#include "langhooks.h"
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#include "langhooks-def.h"
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#include "diagnostic.h"
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#include "debug.h"
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#include "cxx-pretty-print.h"
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#include "cp-objcp-common.h"
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/* Special routine to get the alias set for C++. */
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alias_set_type
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cxx_get_alias_set (tree t)
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{
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if (IS_FAKE_BASE_TYPE (t))
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/* The base variant of a type must be in the same alias set as the
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complete type. */
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return get_alias_set (TYPE_CONTEXT (t));
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/* Punt on PMFs until we canonicalize functions properly. */
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if (TYPE_PTRMEMFUNC_P (t)
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|| (POINTER_TYPE_P (t)
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&& TYPE_PTRMEMFUNC_P (TREE_TYPE (t))))
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return 0;
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return c_common_get_alias_set (t);
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}
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/* Called from check_global_declaration. */
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bool
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cxx_warn_unused_global_decl (const_tree decl)
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{
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if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
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return false;
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if (DECL_IN_SYSTEM_HEADER (decl))
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return false;
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/* Const variables take the place of #defines in C++. */
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if (VAR_P (decl) && TREE_READONLY (decl))
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return false;
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return true;
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}
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/* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */
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size_t
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cp_tree_size (enum tree_code code)
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{
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switch (code)
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{
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case PTRMEM_CST: return sizeof (struct ptrmem_cst);
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case BASELINK: return sizeof (struct tree_baselink);
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case TEMPLATE_PARM_INDEX: return sizeof (template_parm_index);
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case DEFAULT_ARG: return sizeof (struct tree_default_arg);
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case DEFERRED_NOEXCEPT: return sizeof (struct tree_deferred_noexcept);
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case OVERLOAD: return sizeof (struct tree_overload);
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case STATIC_ASSERT: return sizeof (struct tree_static_assert);
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case TYPE_ARGUMENT_PACK:
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case TYPE_PACK_EXPANSION:
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return sizeof (struct tree_common);
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case NONTYPE_ARGUMENT_PACK:
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case EXPR_PACK_EXPANSION:
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return sizeof (struct tree_exp);
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case ARGUMENT_PACK_SELECT:
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return sizeof (struct tree_argument_pack_select);
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case TRAIT_EXPR:
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return sizeof (struct tree_trait_expr);
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case LAMBDA_EXPR: return sizeof (struct tree_lambda_expr);
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case TEMPLATE_INFO: return sizeof (struct tree_template_info);
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case USERDEF_LITERAL: return sizeof (struct tree_userdef_literal);
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case TEMPLATE_DECL: return sizeof (struct tree_template_decl);
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default:
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if (TREE_CODE_CLASS (code) == tcc_declaration)
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return sizeof (struct tree_decl_non_common);
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gcc_unreachable ();
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}
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/* NOTREACHED */
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}
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/* Returns true if T is a variably modified type, in the sense of C99.
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FN is as passed to variably_modified_p.
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This routine needs only check cases that cannot be handled by the
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language-independent logic in tree.c. */
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bool
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cp_var_mod_type_p (tree type, tree fn)
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{
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/* If TYPE is a pointer-to-member, it is variably modified if either
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the class or the member are variably modified. */
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if (TYPE_PTRMEM_P (type))
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return (variably_modified_type_p (TYPE_PTRMEM_CLASS_TYPE (type), fn)
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|| variably_modified_type_p (TYPE_PTRMEM_POINTED_TO_TYPE (type),
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fn));
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/* All other types are not variably modified. */
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return false;
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}
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/* This compares two types for equivalence ("compatible" in C-based languages).
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This routine should only return 1 if it is sure. It should not be used
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in contexts where erroneously returning 0 causes problems. */
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int
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cxx_types_compatible_p (tree x, tree y)
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{
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return same_type_ignoring_top_level_qualifiers_p (x, y);
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}
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/* Return true if DECL is explicit member function. */
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bool
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cp_function_decl_explicit_p (tree decl)
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{
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return (decl
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&& DECL_LANG_SPECIFIC (STRIP_TEMPLATE (decl))
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&& DECL_NONCONVERTING_P (decl));
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}
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/* Return true if DECL is deleted special member function. */
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bool
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cp_function_decl_deleted_p (tree decl)
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{
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return (decl
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&& DECL_LANG_SPECIFIC (STRIP_TEMPLATE (decl))
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&& DECL_DELETED_FN (decl));
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}
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/* Stubs to keep c-opts.c happy. */
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void
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push_file_scope (void)
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{
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}
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void
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pop_file_scope (void)
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{
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}
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/* c-pragma.c needs to query whether a decl has extern "C" linkage. */
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bool
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has_c_linkage (const_tree decl)
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{
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return DECL_EXTERN_C_P (decl);
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}
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static GTY ((cache))
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hash_table<tree_decl_map_cache_hasher> *shadowed_var_for_decl;
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/* Lookup a shadowed var for FROM, and return it if we find one. */
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tree
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decl_shadowed_for_var_lookup (tree from)
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{
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struct tree_decl_map *h, in;
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in.base.from = from;
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h = shadowed_var_for_decl->find_with_hash (&in, DECL_UID (from));
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if (h)
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return h->to;
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return NULL_TREE;
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}
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/* Insert a mapping FROM->TO in the shadowed var hashtable. */
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void
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decl_shadowed_for_var_insert (tree from, tree to)
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{
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struct tree_decl_map *h;
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h = ggc_alloc<tree_decl_map> ();
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h->base.from = from;
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h->to = to;
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*shadowed_var_for_decl->find_slot_with_hash (h, DECL_UID (from), INSERT) = h;
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}
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void
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init_shadowed_var_for_decl (void)
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{
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shadowed_var_for_decl
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= hash_table<tree_decl_map_cache_hasher>::create_ggc (512);
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}
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/* Return true if stmt can fall through. Used by block_may_fallthru
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default case. */
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bool
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cxx_block_may_fallthru (const_tree stmt)
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{
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switch (TREE_CODE (stmt))
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{
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case EXPR_STMT:
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return block_may_fallthru (EXPR_STMT_EXPR (stmt));
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case THROW_EXPR:
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return false;
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default:
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return true;
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}
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}
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void
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cp_common_init_ts (void)
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{
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MARK_TS_DECL_NON_COMMON (USING_DECL);
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MARK_TS_DECL_COMMON (TEMPLATE_DECL);
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MARK_TS_COMMON (TEMPLATE_TEMPLATE_PARM);
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MARK_TS_COMMON (TEMPLATE_TYPE_PARM);
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MARK_TS_COMMON (TEMPLATE_PARM_INDEX);
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MARK_TS_COMMON (OVERLOAD);
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MARK_TS_COMMON (TEMPLATE_INFO);
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MARK_TS_COMMON (TYPENAME_TYPE);
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MARK_TS_COMMON (TYPEOF_TYPE);
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MARK_TS_COMMON (UNDERLYING_TYPE);
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MARK_TS_COMMON (BASELINK);
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MARK_TS_COMMON (TYPE_PACK_EXPANSION);
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MARK_TS_COMMON (TYPE_ARGUMENT_PACK);
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MARK_TS_COMMON (DECLTYPE_TYPE);
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MARK_TS_COMMON (BOUND_TEMPLATE_TEMPLATE_PARM);
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MARK_TS_COMMON (UNBOUND_CLASS_TEMPLATE);
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MARK_TS_TYPED (EXPR_PACK_EXPANSION);
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MARK_TS_TYPED (SWITCH_STMT);
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MARK_TS_TYPED (IF_STMT);
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MARK_TS_TYPED (FOR_STMT);
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MARK_TS_TYPED (RANGE_FOR_STMT);
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MARK_TS_TYPED (AGGR_INIT_EXPR);
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MARK_TS_TYPED (EXPR_STMT);
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MARK_TS_TYPED (EH_SPEC_BLOCK);
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MARK_TS_TYPED (CLEANUP_STMT);
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MARK_TS_TYPED (SCOPE_REF);
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MARK_TS_TYPED (CAST_EXPR);
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MARK_TS_TYPED (NON_DEPENDENT_EXPR);
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MARK_TS_TYPED (MODOP_EXPR);
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MARK_TS_TYPED (TRY_BLOCK);
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MARK_TS_TYPED (THROW_EXPR);
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MARK_TS_TYPED (HANDLER);
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MARK_TS_TYPED (REINTERPRET_CAST_EXPR);
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MARK_TS_TYPED (CONST_CAST_EXPR);
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MARK_TS_TYPED (STATIC_CAST_EXPR);
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MARK_TS_TYPED (DYNAMIC_CAST_EXPR);
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MARK_TS_TYPED (IMPLICIT_CONV_EXPR);
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MARK_TS_TYPED (TEMPLATE_ID_EXPR);
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MARK_TS_TYPED (ARROW_EXPR);
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MARK_TS_TYPED (SIZEOF_EXPR);
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MARK_TS_TYPED (ALIGNOF_EXPR);
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MARK_TS_TYPED (AT_ENCODE_EXPR);
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MARK_TS_TYPED (UNARY_PLUS_EXPR);
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MARK_TS_TYPED (TRAIT_EXPR);
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MARK_TS_TYPED (TYPE_ARGUMENT_PACK);
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MARK_TS_TYPED (NOEXCEPT_EXPR);
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MARK_TS_TYPED (NONTYPE_ARGUMENT_PACK);
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MARK_TS_TYPED (WHILE_STMT);
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MARK_TS_TYPED (NEW_EXPR);
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MARK_TS_TYPED (VEC_NEW_EXPR);
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MARK_TS_TYPED (BREAK_STMT);
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MARK_TS_TYPED (MEMBER_REF);
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MARK_TS_TYPED (DOTSTAR_EXPR);
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MARK_TS_TYPED (DO_STMT);
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MARK_TS_TYPED (DELETE_EXPR);
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MARK_TS_TYPED (VEC_DELETE_EXPR);
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MARK_TS_TYPED (CONTINUE_STMT);
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MARK_TS_TYPED (TAG_DEFN);
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MARK_TS_TYPED (PSEUDO_DTOR_EXPR);
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MARK_TS_TYPED (TYPEID_EXPR);
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MARK_TS_TYPED (MUST_NOT_THROW_EXPR);
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MARK_TS_TYPED (STMT_EXPR);
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MARK_TS_TYPED (OFFSET_REF);
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MARK_TS_TYPED (OFFSETOF_EXPR);
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MARK_TS_TYPED (PTRMEM_CST);
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MARK_TS_TYPED (EMPTY_CLASS_EXPR);
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MARK_TS_TYPED (VEC_INIT_EXPR);
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MARK_TS_TYPED (USING_STMT);
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MARK_TS_TYPED (LAMBDA_EXPR);
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MARK_TS_TYPED (CTOR_INITIALIZER);
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MARK_TS_TYPED (ARRAY_NOTATION_REF);
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}
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#include "gt-cp-cp-objcp-common.h"
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