[MSan] Add __msan_unpoison_string() to the public interface.

Using __msan_unpoison() on null-terminated strings is awkward because
strlen() can't be called on a poisoned string. This case warrants a special
interface function.

llvm-svn: 204448

1 files changed, 4 insertions, 0 deletions

diff --git a/compiler-rt/include/sanitizer/msan_interface.h b/compiler-rt/include/sanitizer/msan_interface.h
index 437fd02ae14..cefc11af7b5 100644
--- a/compiler-rt/include/sanitizer/msan_interface.h
+++ b/compiler-rt/include/sanitizer/msan_interface.h
@@ -38,6 +38,10 @@ extern "C" {
   /* Make memory region fully initialized (without changing its contents). */
   void __msan_unpoison(const volatile void *a, size_t size);
 
+  /* Make a null-terminated string fully initialized (without changing its
+     contents). */
+  void __msan_unpoison_string(const volatile char *a);
+
   /* Make memory region fully uninitialized (without changing its contents). */
   void __msan_poison(const volatile void *a, size_t size);