reland [gtest] Fix printing of StringRef and SmallString in assert messages.

Renames GTEST_NO_LLVM_RAW_OSTREAM -> GTEST_NO_LLVM_SUPPORT and guards
the new features behind it.

This reverts commit a063bcf3ef5a879adbe9639a3c187d876eee0e66.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369527 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/ADT/SmallStringTest.cpp

@@ -169,7 +169,7 @@ TEST_F(SmallStringTest, Realloc) {
   EXPECT_EQ("abcdyyy", theString.slice(0, 7));
 }
 
-TEST(StringRefTest, Comparisons) {
+TEST_F(SmallStringTest, Comparisons) {
   EXPECT_EQ(-1, SmallString<10>("aab").compare("aad"));
   EXPECT_EQ( 0, SmallString<10>("aab").compare("aab"));
   EXPECT_EQ( 1, SmallString<10>("aab").compare("aaa"));
@@ -203,4 +203,12 @@ TEST(StringRefTest, Comparisons) {
   EXPECT_EQ( 1, SmallString<10>("V8_q0").compare_numeric("V1_q0"));
 }
 
+// Check gtest prints SmallString as a string instead of a container of chars.
+// The code is in utils/unittest/googletest/internal/custom/gtest-printers.h
+TEST_F(SmallStringTest, GTestPrinter) {
+  EXPECT_EQ(R"("foo")", ::testing::PrintToString(SmallString<1>("foo")));
+  const SmallVectorImpl<char> &ErasedSmallString = SmallString<1>("foo");
+  EXPECT_EQ(R"("foo")", ::testing::PrintToString(ErasedSmallString));
 }
+
+} // namespace

unittests/ADT/StringRefTest.cpp

@@ -1055,6 +1055,12 @@ TEST(StringRefTest, StringLiteral) {
   EXPECT_EQ(StringRef("Bar"), Strings[1]);
 }
 
+// Check gtest prints StringRef as a string instead of a container of chars.
+// The code is in utils/unittest/googletest/internal/custom/gtest-printers.h
+TEST(StringRefTest, GTestPrinter) {
+  EXPECT_EQ(R"("foo")", ::testing::PrintToString(StringRef("foo")));
+}
+
 static_assert(is_trivially_copyable<StringRef>::value, "trivially copyable");
 
 } // end anonymous namespace

utils/unittest/googletest/include/gtest/internal/custom/gtest-printers.h

@@ -39,4 +39,31 @@
 #ifndef GTEST_INCLUDE_GTEST_INTERNAL_CUSTOM_GTEST_PRINTERS_H_
 #define GTEST_INCLUDE_GTEST_INTERNAL_CUSTOM_GTEST_PRINTERS_H_
 
+#if !GTEST_NO_LLVM_SUPPORT
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include <ostream>
+// Printing of llvm String types.
+// gtest sees these as containers of char (they have nested iterator types),
+// so their operator<< is never considered unless we provide PrintTo().
+// PrintStringTo provides quotes and escaping, at the cost of a copy.
+namespace llvm {
+inline void PrintTo(llvm::StringRef S, std::ostream *OS) {
+  *OS << ::testing::PrintToString(S.str());
+}
+// We need both SmallString<N> and SmallVectorImpl<char> overloads:
+//  - the SmallString<N> template is needed as overload resolution will
+//    instantiate generic PrintTo<T> rather than do derived-to-base conversion
+//  - but SmallVectorImpl<char> is sometimes the actual static type, in code
+//    that erases the small size
+template <unsigned N>
+inline void PrintTo(const SmallString<N> &S, std::ostream *OS) {
+  *OS << ::testing::PrintToString(std::string(S.data(), S.size()));
+}
+inline void PrintTo(const SmallVectorImpl<char> &S, std::ostream *OS) {
+  *OS << ::testing::PrintToString(std::string(S.data(), S.size()));
+}
+} // namespace llvm
+#endif // !GTEST_NO_LLVM_SUPPORT
+
 #endif  // GTEST_INCLUDE_GTEST_INTERNAL_CUSTOM_GTEST_PRINTERS_H_

utils/unittest/googletest/include/gtest/internal/custom/raw-ostream.h

@@ -40,7 +40,7 @@ auto printable(const T &V) -> decltype(StreamSwitch<T>::printable(V)) {
 
 // If raw_ostream support is enabled, we specialize for types with operator<<
 // that takes a raw_ostream.
-#if !GTEST_NO_LLVM_RAW_OSTREAM
+#if !GTEST_NO_LLVM_SUPPORT
 #include "llvm/ADT/Optional.h"
 #include "llvm/Support/raw_os_ostream.h"
 #include "llvm/Support/raw_ostream.h"
@@ -81,6 +81,6 @@ struct StreamSwitch<llvm::Optional<T>,
   }
 };
 } // namespace llvm_gtest
-#endif  // !GTEST_NO_LLVM_RAW_OSTREAM
+#endif  // !GTEST_NO_LLVM_SUPPORT
 
 #endif // GTEST_INCLUDE_GTEST_INTERNAL_CUSTOM_RAW_OSTREAM_H_