Implement bracket insertion for Objective-C instance message sends as
part of parser recovery. For example, given:
a method1:arg];
we detect after parsing the expression "a" that we have the start of a
message send expression. We pretend we've seen a '[' prior to the a,
then parse the remainder as a message send. We'll then give a
diagnostic+fix-it such as:
fixit-objc-message.m:17:3: error: missing '[' at start of message
send expression
a method1:arg];
^
[
The algorithm here is very simple, and always assumes that the open
bracket goes at the beginning of the message send. It also only works
for non-super instance message sends at this time.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113968 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/RAIIObjectsForParser.h b/lib/Parse/RAIIObjectsForParser.h
index addc795..583f184 100644
--- a/lib/Parse/RAIIObjectsForParser.h
+++ b/lib/Parse/RAIIObjectsForParser.h
@@ -80,6 +80,22 @@
}
};
+ class InMessageExpressionRAIIObject {
+ bool &InMessageExpression;
+ bool OldValue;
+
+ public:
+ InMessageExpressionRAIIObject(Parser &P, bool Value)
+ : InMessageExpression(P.InMessageExpression),
+ OldValue(P.InMessageExpression) {
+ InMessageExpression = Value;
+ }
+
+ ~InMessageExpressionRAIIObject() {
+ InMessageExpression = OldValue;
+ }
+ };
+
/// \brief RAII object that makes sure paren/bracket/brace count is correct
/// after declaration/statement parsing, even when there's a parsing error.
class ParenBraceBracketBalancer {