From 14a5ca0498552a4ae3e9b99cb339dcffac6a5a12 Mon Sep 17 00:00:00 2001
From: Rui Ueyama <ruiu@google.com>
Date: Fri, 30 Sep 2016 17:54:31 +0000
Subject: [PATCH] [Object] Define Archive::isEmpty().

llvm-svn: 282884
---
 llvm/include/llvm/Object/Archive.h | 1 +
 llvm/lib/Object/Archive.cpp        | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/llvm/include/llvm/Object/Archive.h b/llvm/include/llvm/Object/Archive.h
index 555900f..14195f8 100644
--- a/llvm/include/llvm/Object/Archive.h
+++ b/llvm/include/llvm/Object/Archive.h
@@ -239,6 +239,7 @@ public:
   // check if a symbol is in the archive
   Expected<Optional<Child>> findSym(StringRef name) const;
 
+  bool isEmpty() const;
   bool hasSymbolTable() const;
   StringRef getSymbolTable() const { return SymbolTable; }
   StringRef getStringTable() const { return StringTable; }
diff --git a/llvm/lib/Object/Archive.cpp b/llvm/lib/Object/Archive.cpp
index 2870584..73761fa 100644
--- a/llvm/lib/Object/Archive.cpp
+++ b/llvm/lib/Object/Archive.cpp
@@ -752,7 +752,7 @@ Archive::Archive(MemoryBufferRef Source, Error &Err)
 
 Archive::child_iterator Archive::child_begin(Error &Err,
                                              bool SkipInternal) const {
-  if (Data.getBufferSize() == 8) // empty archive.
+  if (isEmpty())
     return child_end();
 
   if (SkipInternal)
@@ -968,4 +968,7 @@ Expected<Optional<Archive::Child>> Archive::findSym(StringRef name) const {
   return Optional<Child>();
 }
 
+// Returns true if archive file contains no member file.
+bool Archive::isEmpty() const { return Data.getBufferSize() == 8; }
+
 bool Archive::hasSymbolTable() const { return !SymbolTable.empty(); }
-- 
2.7.4