[ARC] When casting from a pointer to an objective-c object with known ownership, if the

cast type has no ownership specified, implicitly "transfer" the ownership of the cast'ed type
to the cast type:

id x;
static_cast<NSString**>(&x); // Casting as (__strong NSString**).

This currently only works for C++ named casts, C casts to follow.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134273 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 3 deletions

diff --git a/lib/Parse/ParseExprCXX.cpp b/lib/Parse/ParseExprCXX.cpp
index 662a5abe4e..632499295f 100644
--- a/lib/Parse/ParseExprCXX.cpp
+++ b/lib/Parse/ParseExprCXX.cpp
@@ -538,7 +538,14 @@ ExprResult Parser::ParseCXXCasts() {
   if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName))
     return ExprError();
 
-  TypeResult CastTy = ParseTypeName();
+  // Parse the common declaration-specifiers piece.
+  DeclSpec DS(AttrFactory);
+  ParseSpecifierQualifierList(DS);
+
+  // Parse the abstract-declarator, if present.
+  Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
+  ParseDeclarator(DeclaratorInfo);
+
   SourceLocation RAngleBracketLoc = Tok.getLocation();
 
   if (ExpectAndConsume(tok::greater, diag::err_expected_greater))
@@ -554,9 +561,9 @@ ExprResult Parser::ParseCXXCasts() {
   // Match the ')'.
   RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
 
-  if (!Result.isInvalid() && !CastTy.isInvalid())
+  if (!Result.isInvalid() && !DeclaratorInfo.isInvalidType())
     Result = Actions.ActOnCXXNamedCast(OpLoc, Kind,
-                                       LAngleBracketLoc, CastTy.get(),
+                                       LAngleBracketLoc, DeclaratorInfo,
                                        RAngleBracketLoc,
                                        LParenLoc, Result.take(), RParenLoc);