int print_struct_values;
-/* ???. Undocumented. */
+/* Tells the compiler what is the constant string class for Objc. */
const char *constant_string_class_name;
static tree handle_aligned_attribute (tree *, tree, tree, int, bool *);
static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ;
static tree handle_alias_attribute (tree *, tree, tree, int, bool *);
+static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ;
static tree handle_visibility_attribute (tree *, tree, tree, int,
bool *);
static tree handle_tls_model_attribute (tree *, tree, tree, int,
handle_weak_attribute },
{ "alias", 1, 1, true, false, false,
handle_alias_attribute },
+ { "weakref", 0, 1, true, false, false,
+ handle_weakref_attribute },
{ "no_instrument_function", 0, 0, true, false, false,
handle_no_instrument_function_attribute },
{ "malloc", 0, 0, true, false, false,
}
}
+/* Print a warning about casts that might indicate violation
+ of strict aliasing rules if -Wstrict-aliasing is used and
+ strict aliasing mode is in effect. otype is the original
+ TREE_TYPE of expr, and type the type we're casting to. */
+
+void
+strict_aliasing_warning(tree otype, tree type, tree expr)
+{
+ if (flag_strict_aliasing && warn_strict_aliasing
+ && POINTER_TYPE_P (type) && POINTER_TYPE_P (otype)
+ && TREE_CODE (expr) == ADDR_EXPR
+ && (DECL_P (TREE_OPERAND (expr, 0))
+ || TREE_CODE (TREE_OPERAND (expr, 0)) == COMPONENT_REF)
+ && !VOID_TYPE_P (TREE_TYPE (type)))
+ {
+ /* Casting the address of an object to non void pointer. Warn
+ if the cast breaks type based aliasing. */
+ if (!COMPLETE_TYPE_P (TREE_TYPE (type)))
+ warning (OPT_Wstrict_aliasing, "type-punning to incomplete type "
+ "might break strict-aliasing rules");
+ else
+ {
+ HOST_WIDE_INT set1 = get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0)));
+ HOST_WIDE_INT set2 = get_alias_set (TREE_TYPE (type));
+
+ if (!alias_sets_conflict_p (set1, set2))
+ warning (OPT_Wstrict_aliasing, "dereferencing type-punned "
+ "pointer will break strict-aliasing rules");
+ else if (warn_strict_aliasing > 1
+ && !alias_sets_might_conflict_p (set1, set2))
+ warning (OPT_Wstrict_aliasing, "dereferencing type-punned "
+ "pointer might break strict-aliasing rules");
+ }
+ }
+}
+
/* Nonzero if constant C has a value that is permissible
for type TYPE (an INTEGER_TYPE). */
return targetm.vector_opaque_p (t1)
|| targetm.vector_opaque_p (t2)
|| (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))
+ && (TREE_CODE (TREE_TYPE (t1)) != REAL_TYPE ||
+ TYPE_PRECISION (t1) == TYPE_PRECISION (t2))
&& INTEGRAL_TYPE_P (TREE_TYPE (t1))
== INTEGRAL_TYPE_P (TREE_TYPE (t2)));
}
{
low_value = check_case_value (low_value);
low_value = convert_and_check (type, low_value);
+ if (low_value == error_mark_node)
+ goto error_out;
}
if (high_value)
{
high_value = check_case_value (high_value);
high_value = convert_and_check (type, high_value);
+ if (high_value == error_mark_node)
+ goto error_out;
}
- /* If an error has occurred, bail out now. */
- if (low_value == error_mark_node || high_value == error_mark_node)
- goto error_out;
-
- /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
- really a case range, even though it was written that way. Remove
- the HIGH_VALUE to simplify later processing. */
- if (tree_int_cst_equal (low_value, high_value))
- high_value = NULL_TREE;
- if (low_value && high_value
- && !tree_int_cst_lt (low_value, high_value))
- warning (0, "empty range specified");
+ if (low_value && high_value)
+ {
+ /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
+ really a case range, even though it was written that way.
+ Remove the HIGH_VALUE to simplify later processing. */
+ if (tree_int_cst_equal (low_value, high_value))
+ high_value = NULL_TREE;
+ else if (!tree_int_cst_lt (low_value, high_value))
+ warning (0, "empty range specified");
+ }
/* See if the case is in range of the type of the original testing
expression. If both low_value and high_value are out of range,
tree ARG_UNUSED (args), int flags,
bool *no_add_attrs)
{
- tree decl = NULL_TREE;
- tree *type = NULL;
- int is_type = 0;
+ tree type = NULL;
+
+ *no_add_attrs = true;
if (DECL_P (*node))
{
- decl = *node;
- type = &TREE_TYPE (decl);
- is_type = TREE_CODE (*node) == TYPE_DECL;
+ if (TREE_CODE (*node) != TYPE_DECL)
+ goto ignored;
+ node = &TREE_TYPE (*node);
+ type = *node;
}
else if (TYPE_P (*node))
- type = node, is_type = 1;
+ type = *node;
+ else
+ goto ignored;
- if (is_type
- && TREE_CODE (*type) == UNION_TYPE
- && (decl == 0
- || (TYPE_FIELDS (*type) != 0
- && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type)))))
+ if (TREE_CODE (type) == UNION_TYPE)
{
+ /* When IN_PLACE is set, leave the check for FIELDS and MODE to
+ the code in finish_struct. */
if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
- *type = build_variant_type_copy (*type);
- TYPE_TRANSPARENT_UNION (*type) = 1;
- }
- else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
- && TREE_CODE (*type) == UNION_TYPE
- && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type)))
- DECL_TRANSPARENT_UNION (decl) = 1;
- else
- {
- warning (OPT_Wattributes, "%qE attribute ignored", name);
- *no_add_attrs = true;
+ {
+ if (TYPE_FIELDS (type) == NULL_TREE
+ || TYPE_MODE (type) != DECL_MODE (TYPE_FIELDS (type)))
+ goto ignored;
+
+ /* A type variant isn't good enough, since we don't a cast
+ to such a type removed as a no-op. */
+ *node = type = build_duplicate_type (type);
+ }
+
+ TYPE_TRANSPARENT_UNION (type) = 1;
+ return NULL_TREE;
}
+ ignored:
+ warning (OPT_Wattributes, "%qE attribute ignored", name);
return NULL_TREE;
}
DECL_INITIAL (decl) = error_mark_node;
else
{
- DECL_EXTERNAL (decl) = 0;
+ if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
+ DECL_EXTERNAL (decl) = 1;
+ else
+ DECL_EXTERNAL (decl) = 0;
TREE_STATIC (decl) = 1;
}
}
return NULL_TREE;
}
+/* Handle a "weakref" attribute; arguments as in struct
+ attribute_spec.handler. */
+
+static tree
+handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args,
+ int flags, bool *no_add_attrs)
+{
+ tree attr = NULL_TREE;
+
+ /* The idea here is that `weakref("name")' mutates into `weakref,
+ alias("name")', and weakref without arguments, in turn,
+ implicitly adds weak. */
+
+ if (args)
+ {
+ attr = tree_cons (get_identifier ("alias"), args, attr);
+ attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr);
+
+ *no_add_attrs = true;
+ }
+ else
+ {
+ if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node)))
+ error ("%Jweakref attribute must appear before alias attribute",
+ *node);
+
+ attr = tree_cons (get_identifier ("weak"), NULL_TREE, attr);
+ }
+
+ decl_attributes (node, attr, flags);
+
+ return NULL_TREE;
+}
+
/* Handle an "visibility" attribute; arguments as in
struct attribute_spec.handler. */
orig_mode = TYPE_MODE (type);
if (TREE_CODE (type) == RECORD_TYPE
- || (GET_MODE_CLASS (orig_mode) != MODE_FLOAT
+ || (!SCALAR_FLOAT_MODE_P (orig_mode)
&& GET_MODE_CLASS (orig_mode) != MODE_INT)
|| !host_integerp (TYPE_SIZE_UNIT (type), 1))
{
return false;
}
+/* Subscripting with type char is likely to lose on a machine where
+ chars are signed. So warn on any machine, but optionally. Don't
+ warn for unsigned char since that type is safe. Don't warn for
+ signed char because anyone who uses that must have done so
+ deliberately. Furthermore, we reduce the false positive load by
+ warning only for non-constant value of type char. */
+
+void
+warn_array_subscript_with_type_char (tree index)
+{
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node
+ && TREE_CODE (index) != INTEGER_CST)
+ warning (OPT_Wchar_subscripts, "array subscript has type %<char%>");
+}
+
+
#include "gt-c-common.h"
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