ELFObjectWriter: deduplicate suffices in strtab
We already do this for shstrtab, so might as well do it for strtab. This
extracts the string table building code into a separate class. The idea
is to use it for other object formats too.
I mostly wanted to do this for the general principle, but it does save a
little bit on object file size. I tried this on a clang bootstrap and
saved 0.54% on the sum of object file sizes (1.14 MB out of 212 MB for
a release build).
Differential Revision: http://reviews.llvm.org/D3533
llvm-svn: 207670
diff --git a/llvm/unittests/Object/StringTableBuilderTest.cpp b/llvm/unittests/Object/StringTableBuilderTest.cpp
new file mode 100644
index 0000000..130eb4a
--- /dev/null
+++ b/llvm/unittests/Object/StringTableBuilderTest.cpp
@@ -0,0 +1,40 @@
+//===----------- StringTableBuilderTest.cpp -------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+#include "llvm/Object/StringTableBuilder.h"
+#include <string>
+
+using namespace llvm;
+
+namespace {
+
+TEST(StringTableBuilderTest, Basic) {
+ StringTableBuilder B;
+
+ B.add("foo");
+ B.add("bar");
+ B.add("foobar");
+
+ B.finalize();
+
+ std::string Expected;
+ Expected += '\x00';
+ Expected += "foobar";
+ Expected += '\x00';
+ Expected += "foo";
+ Expected += '\x00';
+
+ EXPECT_EQ(Expected, B.data());
+ EXPECT_EQ(1U, B.getOffset("foobar"));
+ EXPECT_EQ(4U, B.getOffset("bar"));
+ EXPECT_EQ(8U, B.getOffset("foo"));
+}
+
+}