tree
begin_lambda_type (tree lambda)
{
tree type;
{
/* Unique name. This is just like an unnamed class, but we cannot use
make_anon_name because of certain checks against TYPE_ANONYMOUS_P. */
tree name;
name = make_lambda_name ();
/* Create the new RECORD_TYPE for this lambda. */
type = xref_tag (/*tag_code=*/record_type,
name,
/*scope=*/ts_lambda,
/*template_header_p=*/false);
if (type == error_mark_node)
return error_mark_node;
}
/* Designate it as a struct so that we can use aggregate initialization. */
CLASSTYPE_DECLARED_CLASS (type) = false;
/* Cross-reference the expression and the type. */
LAMBDA_EXPR_CLOSURE (lambda) = type;
CLASSTYPE_LAMBDA_EXPR (type) = lambda;
/* Clear base types. */
xref_basetypes (type, /*bases=*/NULL_TREE);
/* Start the class. */
type = begin_class_definition (type);
return type;
}
void
init_rtti_processing ()
{
push_namespace (std_identifier);
type_info_type_node = xref_tag
(class_type_node, get_identifier ("type_info"), 1);
pop_namespace ();
tinfo_decl_type =
build_qualified_type (type_info_type_node, TYPE_QUAL_CONST);
}
void
build_module_descriptor (long vers, tree attr)
{
tree decls, *chain = NULL;
#ifdef OBJCPLUS
push_lang_context (lang_name_c); /* extern "C" */
#endif
objc_module_template = objc_start_struct (get_identifier (UTAG_MODULE));
/* long version; */
decls = add_field_decl (long_integer_type_node, "version", &chain);
/* long size; */
add_field_decl (long_integer_type_node, "size", &chain);
/* char *name; */
add_field_decl (string_type_node, "name", &chain);
/* struct _objc_symtab *symtab; */
add_field_decl (build_pointer_type (xref_tag (RECORD_TYPE,
get_identifier (UTAG_SYMTAB))),
"symtab", &chain);
objc_finish_struct (objc_module_template, decls);
/* Create an instance of "_objc_module". */
UOBJC_MODULES_decl = start_var_decl (objc_module_template,
/* FIXME - why the conditional
if the symbol is the
same. */
flag_next_runtime ? "_OBJC_Module" : "_OBJC_Module");
/* This is the root of the metadata for defined classes and categories, it
is referenced by the runtime and, therefore, needed. */
DECL_PRESERVE_P (UOBJC_MODULES_decl) = 1;
/* Squash `defined but not used' warning. */
TREE_USED (UOBJC_MODULES_decl) = 1;
/* Allow the runtime to mark meta-data such that it can be assigned to target
specific sections by the back-end. */
if (attr)
DECL_ATTRIBUTES (UOBJC_MODULES_decl) = attr;
finish_var_decl (UOBJC_MODULES_decl,
init_module_descriptor (TREE_TYPE (UOBJC_MODULES_decl),
vers));
#ifdef OBJCPLUS
pop_lang_context ();
#endif
}
void
init_rtti_processing ()
{
push_namespace (std_identifier);
type_info_type_node
= xref_tag (class_type, get_identifier ("type_info"),
/*attributes=*/NULL_TREE, 1);
pop_namespace ();
type_info_ptr_type =
build_pointer_type
(build_qualified_type (type_info_type_node, TYPE_QUAL_CONST));
create_tinfo_types ();
}
void
init_rtti_processing ()
{
if (flag_honor_std)
push_namespace (get_identifier ("std"));
type_info_type_node = xref_tag
(class_type_node, get_identifier ("type_info"), 1);
if (flag_honor_std)
pop_namespace ();
tinfo_fn_id = get_identifier ("__tf");
tinfo_fn_type = build_function_type
(build_reference_type (build_qualified_type (type_info_type_node,
TYPE_QUAL_CONST)),
void_list_node);
}
tree
objcp_start_struct (enum tree_code code ATTRIBUTE_UNUSED, tree name)
{
tree s;
/* The idea here is to mimic the actions that the C++ parser takes when
constructing 'extern "C" struct NAME {'. */
push_lang_context (lang_name_c);
if (!name)
name = make_anon_name ();
s = xref_tag (record_type, name, ts_global, 0);
CLASSTYPE_DECLARED_CLASS (s) = 0; /* this is a 'struct', not a 'class'. */
xref_basetypes (s, NULL_TREE); /* no base classes here! */
return begin_class_definition (s, NULL_TREE);
}
void
init_rtti_processing (void)
{
tree type_info_type;
push_namespace (std_identifier);
type_info_type = xref_tag (class_type, get_identifier ("type_info"),
/*tag_scope=*/ts_current, false);
pop_namespace ();
const_type_info_type_node
= build_qualified_type (type_info_type, TYPE_QUAL_CONST);
type_info_ptr_type = build_pointer_type (const_type_info_type_node);
unemitted_tinfo_decls = VEC_alloc (tree, 124);
create_tinfo_types ();
}
static tree
vla_capture_type (tree array_type)
{
static tree ptr_id, max_id;
tree type = xref_tag (record_type, make_anon_name (), ts_current, false);
xref_basetypes (type, NULL_TREE);
type = begin_class_definition (type);
if (!ptr_id)
{
ptr_id = get_identifier ("ptr");
max_id = get_identifier ("max");
}
tree ptrtype = build_pointer_type (TREE_TYPE (array_type));
tree field = build_decl (input_location, FIELD_DECL, ptr_id, ptrtype);
finish_member_declaration (field);
field = build_decl (input_location, FIELD_DECL, max_id, sizetype);
finish_member_declaration (field);
return finish_struct (type, NULL_TREE);
}
static tree
init_module_descriptor (tree type, long vers)
{
tree expr, ltyp;
location_t loc;
vec<constructor_elt, va_gc> *v = NULL;
/* No really useful place to point to. */
loc = UNKNOWN_LOCATION;
/* version = { 1, ... } */
expr = build_int_cst (long_integer_type_node, vers);
CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr);
/* size = { ..., sizeof (struct _objc_module), ... } */
expr = convert (long_integer_type_node,
size_in_bytes (objc_module_template));
CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr);
/* Don't provide any file name for security reasons. */
/* name = { ..., "", ... } */
expr = add_objc_string (get_identifier (""), class_names);
CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr);
/* symtab = { ..., _OBJC_SYMBOLS, ... } */
ltyp = build_pointer_type (xref_tag (RECORD_TYPE,
get_identifier (UTAG_SYMTAB)));
if (UOBJC_SYMBOLS_decl)
expr = convert (ltyp, build_unary_op (loc,
ADDR_EXPR, UOBJC_SYMBOLS_decl, 0));
else
expr = convert (ltyp, null_pointer_node);
CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr);
return objc_build_constructor (type, v);
}
static tree
tinfo_base_init (tree desc, tree target)
{
tree init = NULL_TREE;
tree name_decl;
tree vtable_ptr;
{
tree name_name;
/* Generate the NTBS array variable. */
tree name_type = build_cplus_array_type
(build_qualified_type (char_type_node, TYPE_QUAL_CONST),
NULL_TREE);
tree name_string = tinfo_name (target);
/* Determine the name of the variable -- and remember with which
type it is associated. */
name_name = mangle_typeinfo_string_for_type (target);
TREE_TYPE (name_name) = target;
name_decl = build_lang_decl (VAR_DECL, name_name, name_type);
SET_DECL_ASSEMBLER_NAME (name_decl, name_name);
DECL_ARTIFICIAL (name_decl) = 1;
DECL_IGNORED_P (name_decl) = 1;
TREE_READONLY (name_decl) = 1;
TREE_STATIC (name_decl) = 1;
DECL_EXTERNAL (name_decl) = 0;
DECL_TINFO_P (name_decl) = 1;
if (involves_incomplete_p (target))
{
TREE_PUBLIC (name_decl) = 0;
DECL_INTERFACE_KNOWN (name_decl) = 1;
}
else
set_linkage_according_to_type (target, name_decl);
import_export_decl (name_decl);
DECL_INITIAL (name_decl) = name_string;
mark_used (name_decl);
pushdecl_top_level_and_finish (name_decl, name_string);
}
vtable_ptr = TINFO_VTABLE_DECL (desc);
if (!vtable_ptr)
{
tree real_type;
push_nested_namespace (abi_node);
real_type = xref_tag (class_type, TINFO_REAL_NAME (desc),
/* APPLE LOCAL 4184203 */
/*tag_scope=*/ts_global, false);
pop_nested_namespace (abi_node);
if (!COMPLETE_TYPE_P (real_type))
{
/* We never saw a definition of this type, so we need to
tell the compiler that this is an exported class, as
indeed all of the __*_type_info classes are. */
SET_CLASSTYPE_INTERFACE_KNOWN (real_type);
CLASSTYPE_INTERFACE_ONLY (real_type) = 1;
}
vtable_ptr = get_vtable_decl (real_type, /*complete=*/1);
vtable_ptr = build_unary_op (ADDR_EXPR, vtable_ptr, 0);
/* We need to point into the middle of the vtable. */
vtable_ptr = build2
(PLUS_EXPR, TREE_TYPE (vtable_ptr), vtable_ptr,
size_binop (MULT_EXPR,
size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE),
TYPE_SIZE_UNIT (vtable_entry_type)));
TINFO_VTABLE_DECL (desc) = vtable_ptr;
}
init = tree_cons (NULL_TREE, vtable_ptr, init);
init = tree_cons (NULL_TREE, decay_conversion (name_decl), init);
init = build_constructor (NULL_TREE, nreverse (init));
TREE_CONSTANT (init) = 1;
TREE_INVARIANT (init) = 1;
TREE_STATIC (init) = 1;
init = tree_cons (NULL_TREE, init, NULL_TREE);
return init;
}
static tree
build_dynamic_cast_1 (tree type, tree expr)
{
enum tree_code tc = TREE_CODE (type);
tree exprtype = TREE_TYPE (expr);
tree dcast_fn;
tree old_expr = expr;
const char *errstr = NULL;
/* T shall be a pointer or reference to a complete class type, or
`pointer to cv void''. */
switch (tc)
{
case POINTER_TYPE:
if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
break;
/* Fall through. */
case REFERENCE_TYPE:
if (! IS_AGGR_TYPE (TREE_TYPE (type)))
{
errstr = "target is not pointer or reference to class";
goto fail;
}
if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
{
errstr = "target is not pointer or reference to complete type";
goto fail;
}
break;
default:
errstr = "target is not pointer or reference";
goto fail;
}
if (tc == POINTER_TYPE)
{
/* If T is a pointer type, v shall be an rvalue of a pointer to
complete class type, and the result is an rvalue of type T. */
if (TREE_CODE (exprtype) != POINTER_TYPE)
{
errstr = "source is not a pointer";
goto fail;
}
if (! IS_AGGR_TYPE (TREE_TYPE (exprtype)))
{
errstr = "source is not a pointer to class";
goto fail;
}
if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype))))
{
errstr = "source is a pointer to incomplete type";
goto fail;
}
}
else
{
/* Apply trivial conversion T -> T& for dereferenced ptrs. */
exprtype = build_reference_type (exprtype);
expr = convert_to_reference (exprtype, expr, CONV_IMPLICIT,
LOOKUP_NORMAL, NULL_TREE);
/* T is a reference type, v shall be an lvalue of a complete class
type, and the result is an lvalue of the type referred to by T. */
if (! IS_AGGR_TYPE (TREE_TYPE (exprtype)))
{
errstr = "source is not of class type";
goto fail;
}
if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype))))
{
errstr = "source is of incomplete class type";
goto fail;
}
}
/* The dynamic_cast operator shall not cast away constness. */
if (!at_least_as_qualified_p (TREE_TYPE (type),
TREE_TYPE (exprtype)))
{
errstr = "conversion casts away constness";
goto fail;
}
/* If *type is an unambiguous accessible base class of *exprtype,
convert statically. */
{
tree binfo;
binfo = lookup_base (TREE_TYPE (exprtype), TREE_TYPE (type),
ba_check, NULL);
if (binfo)
{
expr = build_base_path (PLUS_EXPR, convert_from_reference (expr),
binfo, 0);
if (TREE_CODE (exprtype) == POINTER_TYPE)
expr = non_lvalue (expr);
return expr;
}
}
/* Otherwise *exprtype must be a polymorphic class (have a vtbl). */
if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype)))
{
tree expr1;
/* if TYPE is `void *', return pointer to complete object. */
if (tc == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (type)))
{
/* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */
if (TREE_CODE (expr) == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (expr, 0)) == VAR_DECL
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE)
return build1 (NOP_EXPR, type, expr);
/* Since expr is used twice below, save it. */
expr = save_expr (expr);
expr1 = build_headof (expr);
if (TREE_TYPE (expr1) != type)
expr1 = build1 (NOP_EXPR, type, expr1);
return ifnonnull (expr, expr1);
}
else
{
tree retval;
tree result, td2, td3, elems;
tree static_type, target_type, boff;
/* If we got here, we can't convert statically. Therefore,
dynamic_cast<D&>(b) (b an object) cannot succeed. */
if (tc == REFERENCE_TYPE)
{
if (TREE_CODE (old_expr) == VAR_DECL
&& TREE_CODE (TREE_TYPE (old_expr)) == RECORD_TYPE)
{
tree expr = throw_bad_cast ();
warning ("dynamic_cast of %q#D to %q#T can never succeed",
old_expr, type);
/* Bash it to the expected type. */
TREE_TYPE (expr) = type;
return expr;
}
}
/* Ditto for dynamic_cast<D*>(&b). */
else if (TREE_CODE (expr) == ADDR_EXPR)
{
tree op = TREE_OPERAND (expr, 0);
if (TREE_CODE (op) == VAR_DECL
&& TREE_CODE (TREE_TYPE (op)) == RECORD_TYPE)
{
warning ("dynamic_cast of %q#D to %q#T can never succeed",
op, type);
retval = build_int_cst (type, 0);
return retval;
}
}
target_type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
static_type = TYPE_MAIN_VARIANT (TREE_TYPE (exprtype));
td2 = get_tinfo_decl (target_type);
mark_used (td2);
td2 = build_unary_op (ADDR_EXPR, td2, 0);
td3 = get_tinfo_decl (static_type);
mark_used (td3);
td3 = build_unary_op (ADDR_EXPR, td3, 0);
/* Determine how T and V are related. */
boff = dcast_base_hint (static_type, target_type);
/* Since expr is used twice below, save it. */
expr = save_expr (expr);
expr1 = expr;
if (tc == REFERENCE_TYPE)
expr1 = build_unary_op (ADDR_EXPR, expr1, 0);
elems = tree_cons
(NULL_TREE, expr1, tree_cons
(NULL_TREE, td3, tree_cons
(NULL_TREE, td2, tree_cons
(NULL_TREE, boff, NULL_TREE))));
dcast_fn = dynamic_cast_node;
if (!dcast_fn)
{
tree tmp;
tree tinfo_ptr;
tree ns = abi_node;
const char *name;
push_nested_namespace (ns);
tinfo_ptr = xref_tag (class_type,
get_identifier ("__class_type_info"),
/* APPLE LOCAL 4184203 */
/*tag_scope=*/ts_global, false);
tinfo_ptr = build_pointer_type
(build_qualified_type
(tinfo_ptr, TYPE_QUAL_CONST));
name = "__dynamic_cast";
tmp = tree_cons
(NULL_TREE, const_ptr_type_node, tree_cons
(NULL_TREE, tinfo_ptr, tree_cons
(NULL_TREE, tinfo_ptr, tree_cons
(NULL_TREE, ptrdiff_type_node, void_list_node))));
tmp = build_function_type (ptr_type_node, tmp);
dcast_fn = build_library_fn_ptr (name, tmp);
DECL_IS_PURE (dcast_fn) = 1;
pop_nested_namespace (ns);
dynamic_cast_node = dcast_fn;
}
result = build_cxx_call (dcast_fn, elems);
if (tc == REFERENCE_TYPE)
{
tree bad = throw_bad_cast ();
result = save_expr (result);
return build3 (COND_EXPR, type, result, result, bad);
}
/* Now back to the type we want from a void*. */
result = cp_convert (type, result);
return ifnonnull (expr, result);
}
}
else
errstr = "source type is not polymorphic";
fail:
error ("cannot dynamic_cast %qE (of type %q#T) to type %q#T (%s)",
expr, exprtype, type, errstr);
return error_mark_node;
}
void
emit_support_tinfos (void)
{
static tree *const fundamentals[] =
{
&void_type_node,
&boolean_type_node,
&wchar_type_node,
&char_type_node, &signed_char_type_node, &unsigned_char_type_node,
&short_integer_type_node, &short_unsigned_type_node,
&integer_type_node, &unsigned_type_node,
&long_integer_type_node, &long_unsigned_type_node,
&long_long_integer_type_node, &long_long_unsigned_type_node,
&float_type_node, &double_type_node, &long_double_type_node,
0
};
int ix;
tree bltn_type, dtor;
push_nested_namespace (abi_node);
bltn_type = xref_tag (class_type,
get_identifier ("__fundamental_type_info"),
/* APPLE LOCAL 4184203 */
/*tag_scope=*/ts_global, false);
pop_nested_namespace (abi_node);
if (!COMPLETE_TYPE_P (bltn_type))
return;
dtor = CLASSTYPE_DESTRUCTORS (bltn_type);
if (!dtor || DECL_EXTERNAL (dtor))
return;
doing_runtime = 1;
for (ix = 0; fundamentals[ix]; ix++)
{
tree bltn = *fundamentals[ix];
tree types[3];
int i;
types[0] = bltn;
types[1] = build_pointer_type (bltn);
types[2] = build_pointer_type (build_qualified_type (bltn,
TYPE_QUAL_CONST));
for (i = 0; i < 3; ++i)
{
tree tinfo;
tinfo = get_tinfo_decl (types[i]);
TREE_USED (tinfo) = 1;
mark_needed (tinfo);
/* APPLE LOCAL begin mainline 4.3 2006-01-10 4871915 */
/* The C++ ABI requires that these objects be COMDAT. But,
On systems without weak symbols, initialized COMDAT
objects are emitted with internal linkage. (See
comdat_linkage for details.) Since we want these objects
to have external linkage so that copies do not have to be
emitted in code outside the runtime library, we make them
non-COMDAT here.
It might also not be necessary to follow this detail of the
ABI. */
if (!flag_weak || ! targetm.cxx.library_rtti_comdat ())
/* APPLE LOCAL end mainline 4.3 2006-01-10 4871915 */
{
gcc_assert (TREE_PUBLIC (tinfo) && !DECL_COMDAT (tinfo));
DECL_INTERFACE_KNOWN (tinfo) = 1;
}
}
}
}
tree
objcp_xref_tag (enum tree_code code ATTRIBUTE_UNUSED, tree name)
{
return xref_tag (record_type, name, ts_global, false);
}
