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Diffstat (limited to 'gcc-4.2.1-5666.3/gcc/cp/cp-objcp-common.c')
| -rw-r--r-- | gcc-4.2.1-5666.3/gcc/cp/cp-objcp-common.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/gcc/cp/cp-objcp-common.c b/gcc-4.2.1-5666.3/gcc/cp/cp-objcp-common.c new file mode 100644 index 000000000..8e4d91cbc --- /dev/null +++ b/gcc-4.2.1-5666.3/gcc/cp/cp-objcp-common.c @@ -0,0 +1,310 @@ +/* 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" |