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/ParseInit.cpp b/lib/Parse/ParseInit.cpp
index d4fc905..1c349fd 100644
--- a/lib/Parse/ParseInit.cpp
+++ b/lib/Parse/ParseInit.cpp
@@ -211,6 +211,11 @@
// [foo ... bar] -> array designator
// [4][foo bar] -> obsolete GNU designation with objc message send.
//
+ // We do not need to check for an expression starting with [[ here. If it
+ // contains an Objective-C message send, then it is not an ill-formed
+ // attribute. If it is a lambda-expression within an array-designator, then
+ // it will be rejected because a constant-expression cannot begin with a
+ // lambda-expression.
InMessageExpressionRAIIObject InMessage(*this, true);
BalancedDelimiterTracker T(*this, tok::l_square);