Re-land "[dsymutil] Timestmap verification for __swift_ast"

This patch adds timestamp verification for swiftmodule files. A new flag
is provided to allows us to disable this check in order to allow testing
of this feature.

Differential revision: https://reviews.llvm.org/D38686

llvm-svn: 315684

1 files changed, 6 insertions, 6 deletions

diff --git a/llvm/tools/dsymutil/BinaryHolder.h b/llvm/tools/dsymutil/BinaryHolder.h
index f4ca0b2bc3a..5b2061d23aa 100644
--- a/llvm/tools/dsymutil/BinaryHolder.h
+++ b/llvm/tools/dsymutil/BinaryHolder.h
@@ -66,12 +66,6 @@ class BinaryHolder {
   MapArchiveAndGetMemberBuffers(StringRef Filename,
                                 sys::TimePoint<std::chrono::seconds> Timestamp);
 
-  void changeBackingMemoryBuffer(std::unique_ptr<MemoryBuffer> &&MemBuf);
-  ErrorOr<const object::ObjectFile &> getObjfileForArch(const Triple &T);
-
-public:
-  BinaryHolder(bool Verbose) : Verbose(Verbose) {}
-
   /// Return the MemoryBufferRef that holds the memory mapping for the
   /// given \p Filename. This function will try to parse archive
   /// member specifications of the form /path/to/archive.a(member.o).
@@ -85,6 +79,12 @@ public:
   GetMemoryBuffersForFile(StringRef Filename,
                           sys::TimePoint<std::chrono::seconds> Timestamp);
 
+  void changeBackingMemoryBuffer(std::unique_ptr<MemoryBuffer> &&MemBuf);
+  ErrorOr<const object::ObjectFile &> getObjfileForArch(const Triple &T);
+
+public:
+  BinaryHolder(bool Verbose) : Verbose(Verbose) {}
+
   /// Get the ObjectFiles designated by the \p Filename. This
   /// might be an archive member specification of the form
   /// /path/to/archive.a(member.o).