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diff --git a/gnu/llvm/lldb/unittests/Language/Highlighting/HighlighterTest.cpp b/gnu/llvm/lldb/unittests/Language/Highlighting/HighlighterTest.cpp
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+++ b/gnu/llvm/lldb/unittests/Language/Highlighting/HighlighterTest.cpp
@@ -0,0 +1,316 @@
+//===-- HighlighterTest.cpp -------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+
+#include "lldb/Core/Highlighter.h"
+#include "lldb/Host/FileSystem.h"
+
+#include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
+#include "Plugins/Language/ObjC/ObjCLanguage.h"
+#include "Plugins/Language/ObjCPlusPlus/ObjCPlusPlusLanguage.h"
+#include "TestingSupport/SubsystemRAII.h"
+
+using namespace lldb_private;
+
+namespace {
+class HighlighterTest : public testing::Test {
+  SubsystemRAII<FileSystem, CPlusPlusLanguage, ObjCLanguage,
+                ObjCPlusPlusLanguage>
+      subsystems;
+};
+} // namespace
+
+static std::string getName(lldb::LanguageType type) {
+  HighlighterManager m;
+  return m.getHighlighterFor(type, "").GetName().str();
+}
+
+static std::string getName(llvm::StringRef path) {
+  HighlighterManager m;
+  return m.getHighlighterFor(lldb::eLanguageTypeUnknown, path).GetName().str();
+}
+
+TEST_F(HighlighterTest, HighlighterSelectionType) {
+  EXPECT_EQ(getName(lldb::eLanguageTypeC_plus_plus), "clang");
+  EXPECT_EQ(getName(lldb::eLanguageTypeC_plus_plus_03), "clang");
+  EXPECT_EQ(getName(lldb::eLanguageTypeC_plus_plus_11), "clang");
+  EXPECT_EQ(getName(lldb::eLanguageTypeC_plus_plus_14), "clang");
+  EXPECT_EQ(getName(lldb::eLanguageTypeObjC), "clang");
+  EXPECT_EQ(getName(lldb::eLanguageTypeObjC_plus_plus), "clang");
+
+  EXPECT_EQ(getName(lldb::eLanguageTypeUnknown), "none");
+  EXPECT_EQ(getName(lldb::eLanguageTypeJulia), "none");
+  EXPECT_EQ(getName(lldb::eLanguageTypeHaskell), "none");
+}
+
+TEST_F(HighlighterTest, HighlighterSelectionPath) {
+  EXPECT_EQ(getName("myfile.cc"), "clang");
+  EXPECT_EQ(getName("moo.cpp"), "clang");
+  EXPECT_EQ(getName("mar.cxx"), "clang");
+  EXPECT_EQ(getName("foo.C"), "clang");
+  EXPECT_EQ(getName("bar.CC"), "clang");
+  EXPECT_EQ(getName("a/dir.CC"), "clang");
+  EXPECT_EQ(getName("/a/dir.hpp"), "clang");
+  EXPECT_EQ(getName("header.h"), "clang");
+
+  EXPECT_EQ(getName(""), "none");
+  EXPECT_EQ(getName("/dev/null"), "none");
+  EXPECT_EQ(getName("Factory.java"), "none");
+  EXPECT_EQ(getName("poll.py"), "none");
+  EXPECT_EQ(getName("reducer.hs"), "none");
+}
+
+TEST_F(HighlighterTest, FallbackHighlighter) {
+  HighlighterManager mgr;
+  const Highlighter &h =
+      mgr.getHighlighterFor(lldb::eLanguageTypePascal83, "foo.pas");
+
+  HighlightStyle style;
+  style.identifier.Set("[", "]");
+  style.semicolons.Set("<", ">");
+
+  const char *code = "program Hello;";
+  std::string output = h.Highlight(style, code, llvm::Optional<size_t>());
+
+  EXPECT_STREQ(output.c_str(), code);
+}
+
+static std::string
+highlightDefault(llvm::StringRef code, HighlightStyle style,
+                 llvm::Optional<size_t> cursor = llvm::Optional<size_t>()) {
+  HighlighterManager mgr;
+  return mgr.getDefaultHighlighter().Highlight(style, code, cursor);
+}
+
+TEST_F(HighlighterTest, DefaultHighlighter) {
+  const char *code = "int my_main() { return 22; } \n";
+
+  HighlightStyle style;
+  EXPECT_EQ(code, highlightDefault(code, style));
+}
+
+TEST_F(HighlighterTest, DefaultHighlighterWithCursor) {
+  HighlightStyle style;
+  style.selected.Set("<c>", "</c>");
+  EXPECT_EQ("<c>a</c> bc", highlightDefault("a bc", style, 0));
+  EXPECT_EQ("a<c> </c>bc", highlightDefault("a bc", style, 1));
+  EXPECT_EQ("a <c>b</c>c", highlightDefault("a bc", style, 2));
+  EXPECT_EQ("a b<c>c</c>", highlightDefault("a bc", style, 3));
+}
+
+TEST_F(HighlighterTest, DefaultHighlighterWithCursorOutOfBounds) {
+  HighlightStyle style;
+  style.selected.Set("<c>", "</c>");
+  EXPECT_EQ("a bc", highlightDefault("a bc", style, 4));
+}
+// Tests highlighting with the Clang highlighter.
+
+static std::string
+highlightC(llvm::StringRef code, HighlightStyle style,
+           llvm::Optional<size_t> cursor = llvm::Optional<size_t>()) {
+  HighlighterManager mgr;
+  const Highlighter &h = mgr.getHighlighterFor(lldb::eLanguageTypeC, "main.c");
+  return h.Highlight(style, code, cursor);
+}
+
+TEST_F(HighlighterTest, ClangEmptyInput) {
+  HighlightStyle s;
+  EXPECT_EQ("", highlightC("", s));
+}
+
+TEST_F(HighlighterTest, ClangScalarLiterals) {
+  HighlightStyle s;
+  s.scalar_literal.Set("<scalar>", "</scalar>");
+
+  EXPECT_EQ(" int i = <scalar>22</scalar>;", highlightC(" int i = 22;", s));
+}
+
+TEST_F(HighlighterTest, ClangStringLiterals) {
+  HighlightStyle s;
+  s.string_literal.Set("<str>", "</str>");
+
+  EXPECT_EQ("const char *f = 22 + <str>\"foo\"</str>;",
+            highlightC("const char *f = 22 + \"foo\";", s));
+}
+
+TEST_F(HighlighterTest, ClangUnterminatedString) {
+  HighlightStyle s;
+  s.string_literal.Set("<str>", "</str>");
+
+  EXPECT_EQ(" f = \"", highlightC(" f = \"", s));
+}
+
+TEST_F(HighlighterTest, Keywords) {
+  HighlightStyle s;
+  s.keyword.Set("<k>", "</k>");
+
+  EXPECT_EQ(" <k>return</k> 1; ", highlightC(" return 1; ", s));
+}
+
+TEST_F(HighlighterTest, Colons) {
+  HighlightStyle s;
+  s.colon.Set("<c>", "</c>");
+
+  EXPECT_EQ("foo<c>:</c><c>:</c>bar<c>:</c>", highlightC("foo::bar:", s));
+}
+
+TEST_F(HighlighterTest, ClangBraces) {
+  HighlightStyle s;
+  s.braces.Set("<b>", "</b>");
+
+  EXPECT_EQ("a<b>{</b><b>}</b>", highlightC("a{}", s));
+}
+
+TEST_F(HighlighterTest, ClangSquareBrackets) {
+  HighlightStyle s;
+  s.square_brackets.Set("<sb>", "</sb>");
+
+  EXPECT_EQ("a<sb>[</sb><sb>]</sb>", highlightC("a[]", s));
+}
+
+TEST_F(HighlighterTest, ClangCommas) {
+  HighlightStyle s;
+  s.comma.Set("<comma>", "</comma>");
+
+  EXPECT_EQ(" bool f = foo()<comma>,</comma> 1;",
+            highlightC(" bool f = foo(), 1;", s));
+}
+
+TEST_F(HighlighterTest, ClangPPDirectives) {
+  HighlightStyle s;
+  s.pp_directive.Set("<pp>", "</pp>");
+
+  EXPECT_EQ("<pp>#</pp><pp>include</pp><pp> </pp><pp>\"foo\"</pp><pp> </pp>//c",
+            highlightC("#include \"foo\" //c", s));
+}
+
+TEST_F(HighlighterTest, ClangPreserveNewLine) {
+  HighlightStyle s;
+  s.comment.Set("<cc>", "</cc>");
+
+  EXPECT_EQ("<cc>//</cc>\n", highlightC("//\n", s));
+}
+
+TEST_F(HighlighterTest, ClangTrailingBackslashBeforeNewline) {
+  HighlightStyle s;
+
+  EXPECT_EQ("\\\n", highlightC("\\\n", s));
+  EXPECT_EQ("\\\r\n", highlightC("\\\r\n", s));
+
+  EXPECT_EQ("#define a \\\n", highlightC("#define a \\\n", s));
+  EXPECT_EQ("#define a \\\r\n", highlightC("#define a \\\r\n", s));
+  EXPECT_EQ("#define a \\\r", highlightC("#define a \\\r", s));
+}
+
+TEST_F(HighlighterTest, ClangTrailingBackslashWithWhitespace) {
+  HighlightStyle s;
+
+  EXPECT_EQ("\\  \n", highlightC("\\  \n", s));
+  EXPECT_EQ("\\ \t\n", highlightC("\\ \t\n", s));
+  EXPECT_EQ("\\ \n", highlightC("\\ \n", s));
+  EXPECT_EQ("\\\t\n", highlightC("\\\t\n", s));
+
+  EXPECT_EQ("#define a \\  \n", highlightC("#define a \\  \n", s));
+  EXPECT_EQ("#define a \\ \t\n", highlightC("#define a \\ \t\n", s));
+  EXPECT_EQ("#define a \\ \n", highlightC("#define a \\ \n", s));
+  EXPECT_EQ("#define a \\\t\n", highlightC("#define a \\\t\n", s));
+}
+
+TEST_F(HighlighterTest, ClangTrailingBackslashMissingNewLine) {
+  HighlightStyle s;
+  EXPECT_EQ("\\", highlightC("\\", s));
+  EXPECT_EQ("#define a\\", highlightC("#define a\\", s));
+}
+
+TEST_F(HighlighterTest, ClangComments) {
+  HighlightStyle s;
+  s.comment.Set("<cc>", "</cc>");
+
+  EXPECT_EQ(" <cc>/*com */</cc> <cc>// com /*n*/</cc>",
+            highlightC(" /*com */ // com /*n*/", s));
+}
+
+TEST_F(HighlighterTest, ClangOperators) {
+  HighlightStyle s;
+  s.operators.Set("[", "]");
+
+  EXPECT_EQ(" 1[+]2[/]a[*]f[&]x[|][~]l", highlightC(" 1+2/a*f&x|~l", s));
+}
+
+TEST_F(HighlighterTest, ClangIdentifiers) {
+  HighlightStyle s;
+  s.identifier.Set("<id>", "</id>");
+
+  EXPECT_EQ(" <id>foo</id> <id>c</id> = <id>bar</id>(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s));
+}
+
+TEST_F(HighlighterTest, ClangCursorPos) {
+  HighlightStyle s;
+  s.selected.Set("<c>", "</c>");
+
+  EXPECT_EQ("<c> </c>foo c = bar(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 0));
+  EXPECT_EQ(" <c>foo</c> c = bar(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 1));
+  EXPECT_EQ(" <c>foo</c> c = bar(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 2));
+  EXPECT_EQ(" <c>foo</c> c = bar(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 3));
+  EXPECT_EQ(" foo<c> </c>c = bar(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 4));
+  EXPECT_EQ(" foo <c>c</c> = bar(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 5));
+}
+
+TEST_F(HighlighterTest, ClangCursorPosEndOfLine) {
+  HighlightStyle s;
+  s.selected.Set("<c>", "</c>");
+
+  EXPECT_EQ("f", highlightC("f", s, 1));
+}
+
+TEST_F(HighlighterTest, ClangCursorOutOfBounds) {
+  HighlightStyle s;
+  s.selected.Set("<c>", "</c>");
+  EXPECT_EQ("f", highlightC("f", s, 2));
+  EXPECT_EQ("f", highlightC("f", s, 3));
+  EXPECT_EQ("f", highlightC("f", s, 4));
+}
+
+TEST_F(HighlighterTest, ClangCursorPosBeforeOtherToken) {
+  HighlightStyle s;
+  s.selected.Set("<c>", "</c>");
+  s.identifier.Set("<id>", "</id>");
+
+  EXPECT_EQ("<c> </c><id>foo</id> <id>c</id> = <id>bar</id>(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 0));
+}
+
+TEST_F(HighlighterTest, ClangCursorPosAfterOtherToken) {
+  HighlightStyle s;
+  s.selected.Set("<c>", "</c>");
+  s.identifier.Set("<id>", "</id>");
+
+  EXPECT_EQ(" <id>foo</id><c> </c><id>c</id> = <id>bar</id>(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 4));
+}
+
+TEST_F(HighlighterTest, ClangCursorPosInOtherToken) {
+  HighlightStyle s;
+  s.selected.Set("<c>", "</c>");
+  s.identifier.Set("<id>", "</id>");
+
+  EXPECT_EQ(" <id><c>foo</c></id> <id>c</id> = <id>bar</id>(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 1));
+  EXPECT_EQ(" <id><c>foo</c></id> <id>c</id> = <id>bar</id>(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 2));
+  EXPECT_EQ(" <id><c>foo</c></id> <id>c</id> = <id>bar</id>(); return 1;",
+            highlightC(" foo c = bar(); return 1;", s, 3));
+}