Subzero: Add basic ELFObjectWriter (text section, symtab, strtab, headers)

unittest/IceELFSectionTest.cpp

Index: unittest/IceELFSectionTest.cpp
diff --git a/unittest/IceELFSectionTest.cpp b/unittest/IceELFSectionTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d4716905dc72031cb0b1a7ed08478870bfbe89bb
--- /dev/null
+++ b/unittest/IceELFSectionTest.cpp
@@ -0,0 +1,116 @@
+//===- unittest/IceELFSectionTest.cpp - ELF Section unit tests ------------===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "IceDefs.h"
+#include "IceELFSection.h"
+#include "gtest/gtest.h"
+
+namespace Ice {
+namespace {
+
+// Test string table layout for various permutations. Test that pop,
+// lollipop, and lipop are able to share data, while the other strings do not.
+void CheckStringTablePermLayout(const ELFStringTableSection &Strtab) {
+  size_t pop_index = Strtab.getIndex("pop");
+  size_t lollipop_index = Strtab.getIndex("lollipop");
+  size_t lipop_index = Strtab.getIndex("lipop");
+  size_t pops_index = Strtab.getIndex("pops");
+  size_t unpop_index = Strtab.getIndex("unpop");
+  size_t popular_index = Strtab.getIndex("popular");
+  size_t a_index = Strtab.getIndex("a");
+
+  EXPECT_EQ(pop_index, lollipop_index + (IceString("lollipop").size() -
+                                         IceString("pop").size()));
+  EXPECT_EQ(lipop_index, lollipop_index + (IceString("lollipop").size() -
+                                           IceString("lipop").size()));
+  // The rest happen to be sorted this way.
+  EXPECT_EQ(1U, pops_index);
+  EXPECT_EQ(popular_index, pops_index + IceString("pops").size() + 1);
+  EXPECT_EQ(unpop_index, popular_index + IceString("popular").size() + 1);
+  EXPECT_EQ(lollipop_index, unpop_index + IceString("unpop").size() + 1);
+  EXPECT_EQ(a_index, lollipop_index + IceString("lollipop").size() + 1);
+}
+
+TEST(IceELFSectionTest, StringTableBuilderPerm1) {
+  ELFStringTableSection Strtab(".strtab", SHT_STRTAB, 0, 1, 0);
+  Strtab.add("pop");
+  Strtab.add("lollipop");
+  Strtab.add("lipop");
+  Strtab.add("pops");
+  Strtab.add("unpop");
+  Strtab.add("popular");
+  Strtab.add("a");
+  Strtab.doLayout();
+  CheckStringTablePermLayout(Strtab);
+}
+
+TEST(IceELFSectionTest, StringTableBuilderPerm2) {
+  ELFStringTableSection Strtab(".strtab", SHT_STRTAB, 0, 1, 0);
+  Strtab.add("lollipop");
+  Strtab.add("pop");
+  Strtab.add("unpop");
+  Strtab.add("pops");
+  Strtab.add("popular");
+  Strtab.add("lipop");
+  Strtab.add("a");
+  Strtab.doLayout();
+  CheckStringTablePermLayout(Strtab);
+}
+
+TEST(IceELFSectionTest, StringTableBuilderPerm3) {
+  ELFStringTableSection Strtab(".strtab", SHT_STRTAB, 0, 1, 0);
+  Strtab.add("pops");
+  Strtab.add("a");
+  Strtab.add("lipop");
+  Strtab.add("popular");
+  Strtab.add("pop");
+  Strtab.add("unpop");
+  Strtab.add("lollipop");
+  Strtab.doLayout();
+  CheckStringTablePermLayout(Strtab);
+}
+
+TEST(IceELFSectionTest, StringTableBuilderPerm4) {
+  ELFStringTableSection Strtab(".strtab", SHT_STRTAB, 0, 1, 0);
+  Strtab.add("unpop");
+  Strtab.add("pop");
+  Strtab.add("lollipop");
+  Strtab.add("a");
+  Strtab.add("popular");
+  Strtab.add("pops");
+  Strtab.add("lipop");
+  Strtab.doLayout();
+  CheckStringTablePermLayout(Strtab);
+}
+
+// Test that adding duplicate strings is fine.
+TEST(IceELFSectionTest, StringTableBuilderDuplicates) {
+  ELFStringTableSection Strtab(".strtab", SHT_STRTAB, 0, 1, 0);
+  Strtab.add("unpop");
+  Strtab.add("pop");
+  Strtab.add("lollipop");
+  Strtab.add("a");
+  Strtab.add("popular");
+  Strtab.add("pops");
+  Strtab.add("lipop");
+
+  Strtab.add("lipop");
+  Strtab.add("pops");
+  Strtab.add("popular");
+  Strtab.add("a");
+  Strtab.add("lollipop");
+  Strtab.add("pop");
+  Strtab.add("unpop");
+
+  Strtab.doLayout();
+  CheckStringTablePermLayout(Strtab);
+}
+
+} // end of anonymous namespace
+} // end of namespace Ice