diff options
Diffstat (limited to 'gcc/c-family/c-attribs.c')
| -rw-r--r-- | gcc/c-family/c-attribs.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/gcc/c-family/c-attribs.c b/gcc/c-family/c-attribs.c index e60fb31..d14e9c4 100644 --- a/gcc/c-family/c-attribs.c +++ b/gcc/c-family/c-attribs.c @@ -123,6 +123,8 @@ static tree handle_pure_attribute (tree *, tree, tree, int, bool *); static tree handle_tm_attribute (tree *, tree, tree, int, bool *); static tree handle_tm_wrap_attribute (tree *, tree, tree, int, bool *); static tree handle_novops_attribute (tree *, tree, tree, int, bool *); +static tree handle_unavailable_attribute (tree *, tree, tree, int, + bool *); static tree handle_vector_size_attribute (tree *, tree, tree, int, bool *) ATTRIBUTE_NONNULL(3); static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); @@ -406,6 +408,8 @@ const struct attribute_spec c_common_attribute_table[] = handle_novops_attribute, NULL }, { "deprecated", 0, 1, false, false, false, false, handle_deprecated_attribute, NULL }, + { "unavailable", 0, 1, false, false, false, false, + handle_unavailable_attribute, NULL }, { "vector_size", 1, 1, false, true, false, true, handle_vector_size_attribute, NULL }, { "visibility", 1, 1, false, false, false, false, @@ -4122,6 +4126,71 @@ handle_deprecated_attribute (tree *node, tree name, return NULL_TREE; } +/* Handle a "unavailable" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_unavailable_attribute (tree *node, tree name, + tree args, int flags, + bool *no_add_attrs) +{ + tree type = NULL_TREE; + int warn = 0; + tree what = NULL_TREE; + + if (!args) + *no_add_attrs = true; + else if (TREE_CODE (TREE_VALUE (args)) != STRING_CST) + { + error ("the message attached to %<unavailable%> is not a string"); + *no_add_attrs = true; + } + + if (DECL_P (*node)) + { + tree decl = *node; + type = TREE_TYPE (decl); + + if (TREE_CODE (decl) == TYPE_DECL + || TREE_CODE (decl) == PARM_DECL + || VAR_OR_FUNCTION_DECL_P (decl) + || TREE_CODE (decl) == FIELD_DECL + || TREE_CODE (decl) == CONST_DECL + || objc_method_decl (TREE_CODE (decl))) + TREE_UNAVAILABLE (decl) = 1; + else + warn = 1; + } + else if (TYPE_P (*node)) + { + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *node = build_variant_type_copy (*node); + TREE_UNAVAILABLE (*node) = 1; + type = *node; + } + else + warn = 1; + + if (warn) + { + *no_add_attrs = true; + if (type && TYPE_NAME (type)) + { + if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) + what = TYPE_NAME (*node); + else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL + && DECL_NAME (TYPE_NAME (type))) + what = DECL_NAME (TYPE_NAME (type)); + } + if (what) + warning (OPT_Wattributes, "%qE attribute ignored for %qE", name, what); + else + warning (OPT_Wattributes, "%qE attribute ignored", name); + } + + return NULL_TREE; +} + /* Return the "base" type from TYPE that is suitable to apply attribute vector_size to by stripping arrays, function types, etc. */ static tree |