return attr_name;
}
+/* Parse attribute arguments. This is a common form of syntax
+ covering all currently valid GNU and standard attributes.
+
+ gnu-attribute-arguments:
+ identifier
+ identifier , nonempty-expr-list
+ expr-list
+
+ where the "identifier" must not be declared as a type. ??? Why not
+ allow identifiers declared as types to start the arguments? */
+
+static tree
+c_parser_attribute_arguments (c_parser *parser, bool takes_identifier)
+{
+ vec<tree, va_gc> *expr_list;
+ tree attr_args;
+ /* Parse the attribute contents. If they start with an
+ identifier which is followed by a comma or close
+ parenthesis, then the arguments start with that
+ identifier; otherwise they are an expression list.
+ In objective-c the identifier may be a classname. */
+ if (c_parser_next_token_is (parser, CPP_NAME)
+ && (c_parser_peek_token (parser)->id_kind == C_ID_ID
+ || (c_dialect_objc ()
+ && c_parser_peek_token (parser)->id_kind
+ == C_ID_CLASSNAME))
+ && ((c_parser_peek_2nd_token (parser)->type == CPP_COMMA)
+ || (c_parser_peek_2nd_token (parser)->type
+ == CPP_CLOSE_PAREN))
+ && (takes_identifier
+ || (c_dialect_objc ()
+ && c_parser_peek_token (parser)->id_kind
+ == C_ID_CLASSNAME)))
+ {
+ tree arg1 = c_parser_peek_token (parser)->value;
+ c_parser_consume_token (parser);
+ if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN))
+ attr_args = build_tree_list (NULL_TREE, arg1);
+ else
+ {
+ tree tree_list;
+ c_parser_consume_token (parser);
+ expr_list = c_parser_expr_list (parser, false, true,
+ NULL, NULL, NULL, NULL);
+ tree_list = build_tree_list_vec (expr_list);
+ attr_args = tree_cons (NULL_TREE, arg1, tree_list);
+ release_tree_vector (expr_list);
+ }
+ }
+ else
+ {
+ if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN))
+ attr_args = NULL_TREE;
+ else
+ {
+ expr_list = c_parser_expr_list (parser, false, true,
+ NULL, NULL, NULL, NULL);
+ attr_args = build_tree_list_vec (expr_list);
+ release_tree_vector (expr_list);
+ }
+ }
+ return attr_args;
+}
+
/* Parse (possibly empty) gnu-attributes. This is a GNU extension.
gnu-attributes:
gnu-attrib:
empty
any-word
- any-word ( identifier )
- any-word ( identifier , nonempty-expr-list )
- any-word ( expr-list )
+ any-word ( gnu-attribute-arguments )
- where the "identifier" must not be declared as a type, and
- "any-word" may be any identifier (including one declared as a
+ where "any-word" may be any identifier (including one declared as a
type), a reserved word storage class specifier, type specifier or
type qualifier. ??? This still leaves out most reserved keywords
- (following the old parser), shouldn't we include them, and why not
- allow identifiers declared as types to start the arguments?
+ (following the old parser), shouldn't we include them?
When EXPECT_COMMA is true, expect the attribute to be preceded
by a comma and fail if it isn't.
When EMPTY_OK is true, allow and consume any number of consecutive
}
c_parser_consume_token (parser);
- vec<tree, va_gc> *expr_list;
- tree attr_args;
- /* Parse the attribute contents. If they start with an
- identifier which is followed by a comma or close
- parenthesis, then the arguments start with that
- identifier; otherwise they are an expression list.
- In objective-c the identifier may be a classname. */
- if (c_parser_next_token_is (parser, CPP_NAME)
- && (c_parser_peek_token (parser)->id_kind == C_ID_ID
- || (c_dialect_objc ()
- && c_parser_peek_token (parser)->id_kind
- == C_ID_CLASSNAME))
- && ((c_parser_peek_2nd_token (parser)->type == CPP_COMMA)
- || (c_parser_peek_2nd_token (parser)->type
- == CPP_CLOSE_PAREN))
- && (attribute_takes_identifier_p (attr_name)
- || (c_dialect_objc ()
- && c_parser_peek_token (parser)->id_kind
- == C_ID_CLASSNAME)))
- {
- tree arg1 = c_parser_peek_token (parser)->value;
- c_parser_consume_token (parser);
- if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN))
- attr_args = build_tree_list (NULL_TREE, arg1);
- else
- {
- tree tree_list;
- c_parser_consume_token (parser);
- expr_list = c_parser_expr_list (parser, false, true,
- NULL, NULL, NULL, NULL);
- tree_list = build_tree_list_vec (expr_list);
- attr_args = tree_cons (NULL_TREE, arg1, tree_list);
- release_tree_vector (expr_list);
- }
- }
- else
- {
- if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN))
- attr_args = NULL_TREE;
- else
- {
- expr_list = c_parser_expr_list (parser, false, true,
- NULL, NULL, NULL, NULL);
- attr_args = build_tree_list_vec (expr_list);
- release_tree_vector (expr_list);
- }
- }
+ tree attr_args
+ = c_parser_attribute_arguments (parser,
+ attribute_takes_identifier_p (attr_name));
attr = build_tree_list (attr_name, attr_args);
if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN))
return attrs;
}
+/* Parse an optional balanced token sequence.
+
+ balanced-token-sequence:
+ balanced-token
+ balanced-token-sequence balanced-token
+
+ balanced-token:
+ ( balanced-token-sequence[opt] )
+ [ balanced-token-sequence[opt] ]
+ { balanced-token-sequence[opt] }
+ any token other than ()[]{}
+*/
+
+static void
+c_parser_balanced_token_sequence (c_parser *parser)
+{
+ while (true)
+ {
+ c_token *token = c_parser_peek_token (parser);
+ switch (token->type)
+ {
+ case CPP_OPEN_BRACE:
+ {
+ matching_braces braces;
+ braces.consume_open (parser);
+ c_parser_balanced_token_sequence (parser);
+ braces.require_close (parser);
+ break;
+ }
+
+ case CPP_OPEN_PAREN:
+ {
+ matching_parens parens;
+ parens.consume_open (parser);
+ c_parser_balanced_token_sequence (parser);
+ parens.require_close (parser);
+ break;
+ }
+
+ case CPP_OPEN_SQUARE:
+ c_parser_consume_token (parser);
+ c_parser_balanced_token_sequence (parser);
+ c_parser_require (parser, CPP_CLOSE_SQUARE, "expected %<]%>");
+ break;
+
+ case CPP_CLOSE_BRACE:
+ case CPP_CLOSE_PAREN:
+ case CPP_CLOSE_SQUARE:
+ case CPP_EOF:
+ return;
+
+ default:
+ c_parser_consume_token (parser);
+ break;
+ }
+ }
+}
+
+/* Parse standard (C2X) attributes (including GNU attributes in the
+ gnu:: namespace).
+
+ attribute-specifier-sequence:
+ attribute-specifier-sequence[opt] attribute-specifier
+
+ attribute-specifier:
+ [ [ attribute-list ] ]
+
+ attribute-list:
+ attribute[opt]
+ attribute-list, attribute[opt]
+
+ attribute:
+ attribute-token attribute-argument-clause[opt]
+
+ attribute-token:
+ standard-attribute
+ attribute-prefixed-token
+
+ standard-attribute:
+ identifier
+
+ attribute-prefixed-token:
+ attribute-prefix :: identifier
+
+ attribute-prefix:
+ identifier
+
+ attribute-argument-clause:
+ ( balanced-token-sequence[opt] )
+
+ Keywords are accepted as identifiers for this purpose.
+*/
+
+static tree
+c_parser_std_attribute (c_parser *parser)
+{
+ c_token *token = c_parser_peek_token (parser);
+ tree ns, name, attribute;
+
+ /* Parse the attribute-token. */
+ if (token->type != CPP_NAME && token->type != CPP_KEYWORD)
+ {
+ c_parser_error (parser, "expected identifier");
+ return error_mark_node;
+ }
+ name = canonicalize_attr_name (token->value);
+ c_parser_consume_token (parser);
+ if (c_parser_next_token_is (parser, CPP_SCOPE))
+ {
+ ns = name;
+ c_parser_consume_token (parser);
+ token = c_parser_peek_token (parser);
+ if (token->type != CPP_NAME && token->type != CPP_KEYWORD)
+ {
+ c_parser_error (parser, "expected identifier");
+ return error_mark_node;
+ }
+ name = canonicalize_attr_name (token->value);
+ c_parser_consume_token (parser);
+ }
+ else
+ ns = NULL_TREE;
+ attribute = build_tree_list (build_tree_list (ns, name), NULL_TREE);
+
+ /* Parse the arguments, if any. */
+ if (c_parser_next_token_is_not (parser, CPP_OPEN_PAREN))
+ return attribute;
+ location_t open_loc = c_parser_peek_token (parser)->location;
+ matching_parens parens;
+ parens.consume_open (parser);
+ const attribute_spec *as = lookup_attribute_spec (TREE_PURPOSE (attribute));
+ if ((as && as->max_length == 0)
+ /* Special-case the transactional-memory attribute "outer",
+ which is specially handled but not registered as an
+ attribute, to avoid allowing arbitrary balanced token
+ sequences as arguments. */
+ || is_attribute_p ("outer", name))
+ {
+ error_at (open_loc, "%qE attribute does not take any arguments", name);
+ parens.skip_until_found_close (parser);
+ return error_mark_node;
+ }
+ if (as)
+ {
+ bool takes_identifier
+ = (ns != NULL_TREE
+ && strcmp (IDENTIFIER_POINTER (ns), "gnu") == 0
+ && attribute_takes_identifier_p (name));
+ TREE_VALUE (attribute)
+ = c_parser_attribute_arguments (parser, takes_identifier);
+ }
+ else
+ c_parser_balanced_token_sequence (parser);
+ parens.require_close (parser);
+ return attribute;
+}
+
+static tree
+c_parser_std_attribute_specifier (c_parser *parser, bool for_tm)
+{
+ location_t loc = c_parser_peek_token (parser)->location;
+ if (!c_parser_require (parser, CPP_OPEN_SQUARE, "expected %<[%>"))
+ return NULL_TREE;
+ if (!c_parser_require (parser, CPP_OPEN_SQUARE, "expected %<[%>"))
+ {
+ c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, "expected %<]%>");
+ return NULL_TREE;
+ }
+ if (!for_tm)
+ pedwarn_c11 (loc, OPT_Wpedantic,
+ "ISO C does not support %<[[]]%> attributes before C2X");
+ tree attributes = NULL_TREE;
+ while (true)
+ {
+ c_token *token = c_parser_peek_token (parser);
+ if (token->type == CPP_CLOSE_SQUARE)
+ break;
+ if (token->type == CPP_COMMA)
+ {
+ c_parser_consume_token (parser);
+ continue;
+ }
+ tree attribute = c_parser_std_attribute (parser);
+ if (attribute != error_mark_node)
+ {
+ TREE_CHAIN (attribute) = attributes;
+ attributes = attribute;
+ }
+ if (c_parser_next_token_is_not (parser, CPP_COMMA))
+ break;
+ }
+ c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, "expected %<]%>");
+ c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, "expected %<]%>");
+ return nreverse (attributes);
+}
+
/* Parse a type name (C90 6.5.5, C99 6.7.6, C11 6.7.7). ALIGNAS_OK
says whether alignment specifiers are OK (only in cases that might
be the type name of a compound literal).
transaction-attribute:
gnu-attributes
- [ [ any-word ] ]
-
- The transactional memory language description is written for C++,
- and uses the C++0x attribute syntax. For compatibility, allow the
- bracket style for transactions in C as well. */
+ attribute-specifier
+*/
static tree
c_parser_transaction_attributes (c_parser *parser)
{
- tree attr_name, attr = NULL;
-
if (c_parser_next_token_is_keyword (parser, RID_ATTRIBUTE))
return c_parser_gnu_attributes (parser);
if (!c_parser_next_token_is (parser, CPP_OPEN_SQUARE))
return NULL_TREE;
- c_parser_consume_token (parser);
- if (!c_parser_require (parser, CPP_OPEN_SQUARE, "expected %<[%>"))
- goto error1;
-
- attr_name = c_parser_gnu_attribute_any_word (parser);
- if (attr_name)
- {
- c_parser_consume_token (parser);
- attr = build_tree_list (attr_name, NULL_TREE);
- }
- else
- c_parser_error (parser, "expected identifier");
-
- c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, "expected %<]%>");
- error1:
- c_parser_skip_until_found (parser, CPP_CLOSE_SQUARE, "expected %<]%>");
- return attr;
+ return c_parser_std_attribute_specifier (parser, true);
}
/* Parse a __transaction_atomic or __transaction_relaxed statement
projects / gcc.git / commitdiff