Add support for Microsoft __if_exists and __if_not_exists construct inside function definition.

Allow to include or exclude code depending on if a symbol exists or not. Just like a #ifdef but for C/C++ symbols.

More doc: http://msdn.microsoft.com/en-us/library/x7wy9xh3(v=VS.100).aspx

Support at class and namespace scopes will be added later.

llvm-svn: 131014

1 files changed, 33 insertions, 0 deletions

diff --git a/clang/test/Parser/MicrosoftExtensions.cpp b/clang/test/Parser/MicrosoftExtensions.cpp
index 32ed375889a..933231d5f70 100644
--- a/clang/test/Parser/MicrosoftExtensions.cpp
+++ b/clang/test/Parser/MicrosoftExtensions.cpp
@@ -164,3 +164,36 @@ __interface MicrosoftInterface {
 };
 
 __int64 x7 = __int64(0);
+
+
+
+
+class IF_EXISTS {
+private:
+    typedef int Type;
+};
+
+int __if_exists_test() {
+
+  int b=0;
+
+
+  __if_exists(IF_EXISTS::Type) {
+     b++;
+     b++;
+  }
+
+  __if_exists(IF_EXISTS::Type_not) {
+     this wont compile.
+  }
+
+  __if_not_exists(IF_EXISTS::Type) {
+     this wont compile.
+  }
+
+  __if_not_exists(IF_EXISTS::Type_not) {
+     b++;
+     b++;
+  }
+
+}