Added Control Flow Protection Flag

Cf-protection is a target independent flag that instructs the back-end to instrument control flow mechanisms like: Branch, Return, etc.
For example in X86 this flag will be used to instrument Indirect Branch Tracking instructions.

Differential Revision: https://reviews.llvm.org/D40478

Change-Id: I5126e766c0e6b84118cae0ee8a20fe78cc373dea

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@322063 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 0 deletions

diff --git a/include/clang/Basic/TargetInfo.h b/include/clang/Basic/TargetInfo.h
index fad923c272..0fc622348c 100644
--- a/include/clang/Basic/TargetInfo.h
+++ b/include/clang/Basic/TargetInfo.h
@@ -1051,6 +1051,18 @@ public:
     return false;
   }
 
+  /// Check if the target supports CFProtection branch.
+  virtual bool
+  checkCFProtectionBranchSupported(DiagnosticsEngine &Diags) const {
+    return false;
+  }
+
+  /// Check if the target supports CFProtection branch.
+  virtual bool
+  checkCFProtectionReturnSupported(DiagnosticsEngine &Diags) const {
+    return false;
+  }
+
   /// \brief Whether target allows to overalign ABI-specified preferred alignment
   virtual bool allowsLargerPreferedTypeAlignment() const { return true; }