Disambiguation of '[[':
* In C++11, '[[' is ill-formed unless it starts an attribute-specifier. Reject
array sizes and array indexes which begin with a lambda-expression. Recover by
parsing the lambda as a lambda.
* In Objective-C++11, either '[' could be the start of a message-send.
Fully disambiguate this case: it turns out that the grammars of message-sends,
lambdas and attributes do not actually overlap. Accept any occurrence of '[['
where either '[' starts a message send, but reject a lambda in an array index
just like in C++11 mode.
Implement a couple of changes to the attribute wording which occurred after our
attributes implementation landed:
* In a function-declaration, the attributes go after the exception specification,
not after the right paren.
* A reference type can have attributes applied.
* An 'identifier' in an attribute can also be a keyword. Support for alternative
tokens (iso646 keywords) in attributes to follow.
And some bug fixes:
* Parse attributes after declarator-ids, even if they are not simple identifiers.
* Do not accept attributes after a parenthesized declarator.
* Accept attributes after an array size in a new-type-id.
* Partially disamiguate 'delete' followed by a lambda. More work is required
here for the case where the lambda-introducer is '[]'.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154369 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index f68359b..7f3a815 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -1287,7 +1287,12 @@
if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() &&
isSimpleObjCMessageExpression())
return move(LHS);
-
+
+ // Reject array indices starting with a lambda-expression. '[[' is
+ // reserved for attributes.
+ if (CheckProhibitedCXX11Attribute())
+ return ExprError();
+
BalancedDelimiterTracker T(*this, tok::l_square);
T.consumeOpen();
Loc = T.getOpenLocation();
@@ -1756,6 +1761,9 @@
Comps.back().LocEnd = ConsumeToken();
} else if (Tok.is(tok::l_square)) {
+ if (CheckProhibitedCXX11Attribute())
+ return ExprError();
+
// offsetof-member-designator: offsetof-member-design '[' expression ']'
Comps.push_back(Sema::OffsetOfComponent());
Comps.back().isBrackets = true;