Implement support for dependent Microsoft __if_exists/__if_not_exists

statements. As noted in the documentation for the AST node, the
semantics of __if_exists/__if_not_exists are somewhat different from
the way Visual C++ implements them, because our parsed-template
representation can't accommodate VC++ semantics without serious
contortions. Hopefully this implementation is "good enough".

llvm-svn: 142901

1 files changed, 10 insertions, 1 deletions

diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
index 5c2ed4e5f52..fb884349291 100644
--- a/clang/lib/Parse/ParseStmt.cpp
+++ b/clang/lib/Parse/ParseStmt.cpp
@@ -2152,7 +2152,16 @@ void Parser::ParseMicrosoftIfExistsStatement(StmtVector &Stmts) {
     
     ParsedAttributes Attrs(AttrFactory);
     StmtResult Compound = ParseCompoundStatement(Attrs);
-    // FIXME: We're dropping these statements on the floor.
+    if (Compound.isInvalid())
+      return;
+    
+    StmtResult DepResult = Actions.ActOnMSDependentExistsStmt(Result.KeywordLoc,
+                                                              Result.IsIfExists,
+                                                              Result.SS, 
+                                                              Result.Name,
+                                                              Compound.get());
+    if (DepResult.isUsable())
+      Stmts.push_back(DepResult.get());
     return;
   }