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.

llvm-svn: 113968

1 files changed, 2 insertions, 1 deletions

diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
index 3ff940faf9d..5ebee67b7a4 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -460,7 +460,8 @@ StmtResult Parser::ParseCompoundStatementBody(bool isStmtExpr) {
   PrettyStackTraceLoc CrashInfo(PP.getSourceManager(),
                                 Tok.getLocation(),
                                 "in compound statement ('{}')");
-
+  InMessageExpressionRAIIObject InMessage(*this, false);
+  
   SourceLocation LBraceLoc = ConsumeBrace();  // eat the '{'.
 
   // TODO: "__label__ X, Y, Z;" is the GNU "Local Label" extension.  These are