[dfsan] Begin a private header and move shadow_for there.

Differential Revision: http://llvm-reviews.chandlerc.com/D1348

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@188231 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/dfsan/dfsan.h b/lib/dfsan/dfsan.h
new file mode 100644
index 000000000..873eb31a5
--- /dev/null
+++ b/lib/dfsan/dfsan.h
@@ -0,0 +1,32 @@
+//===-- dfsan.h -------------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of DataFlowSanitizer.
+//
+// Private DFSan header.
+//===----------------------------------------------------------------------===//
+
+#ifndef DFSAN_H
+#define DFSAN_H
+
+#include "sanitizer/dfsan_interface.h"
+
+namespace __dfsan {
+
+inline dfsan_label *shadow_for(void *ptr) {
+  return (dfsan_label *) ((((uintptr_t) ptr) & ~0x700000000000) << 1);
+}
+
+inline const dfsan_label *shadow_for(const void *ptr) {
+  return shadow_for(const_cast<void *>(ptr));
+}
+
+}  // namespace __dfsan
+
+#endif  // DFSAN_H