Initial check in
Bug: 137197907
diff --git a/src/llvm-project/llvm/unittests/ADT/TwineTest.cpp b/src/llvm-project/llvm/unittests/ADT/TwineTest.cpp
new file mode 100644
index 0000000..950eda2
--- /dev/null
+++ b/src/llvm-project/llvm/unittests/ADT/TwineTest.cpp
@@ -0,0 +1,123 @@
+//===- TwineTest.cpp - Twine unit tests -----------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/Twine.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/FormatAdapters.h"
+#include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/raw_ostream.h"
+#include "gtest/gtest.h"
+using namespace llvm;
+
+namespace {
+
+std::string repr(const Twine &Value) {
+ std::string res;
+ llvm::raw_string_ostream OS(res);
+ Value.printRepr(OS);
+ return OS.str();
+}
+
+TEST(TwineTest, Construction) {
+ EXPECT_EQ("", Twine().str());
+ EXPECT_EQ("hi", Twine("hi").str());
+ EXPECT_EQ("hi", Twine(std::string("hi")).str());
+ EXPECT_EQ("hi", Twine(StringRef("hi")).str());
+ EXPECT_EQ("hi", Twine(StringRef(std::string("hi"))).str());
+ EXPECT_EQ("hi", Twine(StringRef("hithere", 2)).str());
+ EXPECT_EQ("hi", Twine(SmallString<4>("hi")).str());
+ EXPECT_EQ("hi", Twine(formatv("{0}", "hi")).str());
+}
+
+TEST(TwineTest, Numbers) {
+ EXPECT_EQ("123", Twine(123U).str());
+ EXPECT_EQ("123", Twine(123).str());
+ EXPECT_EQ("-123", Twine(-123).str());
+ EXPECT_EQ("123", Twine(123).str());
+ EXPECT_EQ("-123", Twine(-123).str());
+
+ EXPECT_EQ("7b", Twine::utohexstr(123).str());
+}
+
+TEST(TwineTest, Characters) {
+ EXPECT_EQ("x", Twine('x').str());
+ EXPECT_EQ("x", Twine(static_cast<unsigned char>('x')).str());
+ EXPECT_EQ("x", Twine(static_cast<signed char>('x')).str());
+}
+
+TEST(TwineTest, Concat) {
+ // Check verse repr, since we care about the actual representation not just
+ // the result.
+
+ // Concat with null.
+ EXPECT_EQ("(Twine null empty)",
+ repr(Twine("hi").concat(Twine::createNull())));
+ EXPECT_EQ("(Twine null empty)",
+ repr(Twine::createNull().concat(Twine("hi"))));
+
+ // Concat with empty.
+ EXPECT_EQ("(Twine cstring:\"hi\" empty)",
+ repr(Twine("hi").concat(Twine())));
+ EXPECT_EQ("(Twine cstring:\"hi\" empty)",
+ repr(Twine().concat(Twine("hi"))));
+ EXPECT_EQ("(Twine smallstring:\"hi\" empty)",
+ repr(Twine().concat(Twine(SmallString<5>("hi")))));
+ EXPECT_EQ("(Twine formatv:\"howdy\" empty)",
+ repr(Twine(formatv("howdy")).concat(Twine())));
+ EXPECT_EQ("(Twine formatv:\"howdy\" empty)",
+ repr(Twine().concat(Twine(formatv("howdy")))));
+ EXPECT_EQ("(Twine smallstring:\"hey\" cstring:\"there\")",
+ repr(Twine(SmallString<7>("hey")).concat(Twine("there"))));
+
+ // Concatenation of unary ropes.
+ EXPECT_EQ("(Twine cstring:\"a\" cstring:\"b\")",
+ repr(Twine("a").concat(Twine("b"))));
+
+ // Concatenation of other ropes.
+ EXPECT_EQ("(Twine rope:(Twine cstring:\"a\" cstring:\"b\") cstring:\"c\")",
+ repr(Twine("a").concat(Twine("b")).concat(Twine("c"))));
+ EXPECT_EQ("(Twine cstring:\"a\" rope:(Twine cstring:\"b\" cstring:\"c\"))",
+ repr(Twine("a").concat(Twine("b").concat(Twine("c")))));
+ EXPECT_EQ("(Twine cstring:\"a\" rope:(Twine smallstring:\"b\" cstring:\"c\"))",
+ repr(Twine("a").concat(Twine(SmallString<3>("b")).concat(Twine("c")))));
+}
+
+TEST(TwineTest, toNullTerminatedStringRef) {
+ SmallString<8> storage;
+ EXPECT_EQ(0, *Twine("hello").toNullTerminatedStringRef(storage).end());
+ EXPECT_EQ(0,
+ *Twine(StringRef("hello")).toNullTerminatedStringRef(storage).end());
+ EXPECT_EQ(0, *Twine(SmallString<11>("hello"))
+ .toNullTerminatedStringRef(storage)
+ .end());
+ EXPECT_EQ(0, *Twine(formatv("{0}{1}", "how", "dy"))
+ .toNullTerminatedStringRef(storage)
+ .end());
+}
+
+TEST(TwineTest, LazyEvaluation) {
+ struct formatter : FormatAdapter<int> {
+ explicit formatter(int &Count) : FormatAdapter(0), Count(Count) {}
+ int &Count;
+
+ void format(raw_ostream &OS, StringRef Style) { ++Count; }
+ };
+
+ int Count = 0;
+ formatter Formatter(Count);
+ (void)Twine(formatv("{0}", Formatter));
+ EXPECT_EQ(0, Count);
+ (void)Twine(formatv("{0}", Formatter)).str();
+ EXPECT_EQ(1, Count);
+}
+
+ // I suppose linking in the entire code generator to add a unit test to check
+ // the code size of the concat operation is overkill... :)
+
+} // end anonymous namespace
