| /* Some code common to C++ and ObjC++ front ends. |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| Contributed by Ziemowit Laski <zlaski@apple.com> |
| |
| 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, 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, 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 "debug.h" |
| #include "cxx-pretty-print.h" |
| #include "cp-objcp-common.h" |
| |
| /* Special routine to get the alias set for C++. */ |
| |
| 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)); |
| |
| /* Punt on PMFs until we canonicalize functions properly. */ |
| if (TYPE_PTRMEMFUNC_P (t)) |
| return 0; |
| |
| return c_common_get_alias_set (t); |
| } |
| |
| /* Called from check_global_declarations. */ |
| |
| 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. */ |
| |
| tree |
| cp_expr_size (tree exp) |
| { |
| tree type = TREE_TYPE (exp); |
| |
| if (CLASS_TYPE_P (type)) |
| { |
| /* 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. */ |
| gcc_assert (!TYPE_HAS_COMPLEX_INIT_REF (type) |
| || !TYPE_HAS_COMPLEX_ASSIGN_REF (type) |
| /* But storing a CONSTRUCTOR isn't a copy. */ |
| || TREE_CODE (exp) == CONSTRUCTOR |
| /* And, the gimplifier will sometimes make a copy of |
| an aggregate. In particular, for a case like: |
| |
| struct S { S(); }; |
| struct X { int a; S s; }; |
| X x = { 0 }; |
| |
| the gimplifier will create a temporary with |
| static storage duration, perform static |
| initialization of the temporary, and then copy |
| the result. Since the "s" subobject is never |
| constructed, this is a valid transformation. */ |
| || CP_AGGREGATE_TYPE_P (type)); |
| |
| /* This would be wrong for a type with virtual bases, but they are |
| caught by the assert above. */ |
| return (is_empty_class (type) |
| ? size_zero_node |
| : CLASSTYPE_SIZE_UNIT (type)); |
| } |
| else |
| /* Use the default code. */ |
| return lhd_expr_size (exp); |
| } |
| |
| /* Langhook for tree_size: determine size of our 'x' and 'c' nodes. */ |
| size_t |
| cp_tree_size (enum tree_code code) |
| { |
| switch (code) |
| { |
| case TINST_LEVEL: return sizeof (struct tinst_level_s); |
| 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: |
| 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_PTR_TO_MEMBER_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) |
| { |
| pretty_printer *base = context->printer; |
| cxx_pretty_printer *pp = XNEW (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); |
| } |
| |
| /* 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) |
| { |
| if (same_type_ignoring_top_level_qualifiers_p (x, y)) |
| return 1; |
| |
| /* Once we get to the middle-end, references and pointers are |
| interchangeable. FIXME should we try to replace all references with |
| pointers? */ |
| if (POINTER_TYPE_P (x) && POINTER_TYPE_P (y) |
| && TYPE_MODE (x) == TYPE_MODE (y) |
| && TYPE_REF_CAN_ALIAS_ALL (x) == TYPE_REF_CAN_ALIAS_ALL (y) |
| && same_type_p (TREE_TYPE (x), TREE_TYPE (y))) |
| return 1; |
| |
| return 0; |
| } |
| |
| tree |
| cxx_staticp (tree arg) |
| { |
| switch (TREE_CODE (arg)) |
| { |
| case BASELINK: |
| return staticp (BASELINK_FUNCTIONS (arg)); |
| |
| default: |
| break; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* 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 (tree decl) |
| { |
| return DECL_EXTERN_C_P (decl); |
| } |
| |
| /* APPLE LOCAL begin kext identify vtables */ |
| /* Return true if t is a vtable. In kexts (only) these may |
| be overridden by other modules, so we can't do the |
| normal optimizations we do on initialized const objects. */ |
| int |
| cp_vtable_p (tree t) |
| { |
| if (TREE_CODE (t) == VAR_DECL |
| && TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE |
| && TREE_TYPE (TREE_TYPE (t)) == vtable_entry_type) |
| return 1; |
| return 0; |
| } |
| /* APPLE LOCAL end kext identify vtables */ |
| |
| static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_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_map *h, in; |
| in.from = from; |
| |
| h = (struct tree_map *) htab_find_with_hash (shadowed_var_for_decl, &in, |
| htab_hash_pointer (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_map *h; |
| void **loc; |
| |
| h = GGC_NEW (struct tree_map); |
| h->hash = htab_hash_pointer (from); |
| h->from = from; |
| h->to = to; |
| loc = htab_find_slot_with_hash (shadowed_var_for_decl, h, h->hash, INSERT); |
| *(struct tree_map **) loc = h; |
| } |
| |
| void |
| init_shadowed_var_for_decl (void) |
| { |
| shadowed_var_for_decl = htab_create_ggc (512, tree_map_hash, |
| tree_map_eq, 0); |
| } |
| |
| /* APPLE LOCAL begin radar 5741070 */ |
| /* Given an IDENTIFIER tree for a class interface, find (if possible) and |
| return the record type for the class interface. */ |
| |
| tree |
| c_return_interface_record_type (tree typename) |
| { |
| enum tree_code_class class; |
| enum tree_code code; |
| tree retval = NULL; |
| |
| if (typename == NULL) |
| return retval; |
| |
| code = TREE_CODE (typename); |
| class = TREE_CODE_CLASS (code); |
| |
| if (code != IDENTIFIER_NODE |
| || class != tcc_exceptional) |
| return retval; |
| |
| if (TREE_TYPE (typename) |
| && TREE_CODE (TREE_TYPE (typename)) == RECORD_TYPE) |
| retval = TREE_TYPE (typename); |
| |
| if (retval |
| && TREE_CODE (retval) != RECORD_TYPE) |
| retval = NULL; |
| |
| return retval; |
| } |
| /* APPLE LOCAL end radar 5741070 */ |
| |
| #include "gt-cp-cp-objcp-common.h" |