fixup! add test

Author: Michael137

lldb/source/Target/Language.cpp

@@ -550,9 +550,10 @@ ToDwarfSourceLanguage(lldb::LanguageType language_type) {
   switch (language_type) {
   case eLanguageTypeMipsAssembler:
     return llvm::dwarf::DW_LANG_Mips_Assembler;
-  default:
-    return llvm::dwarf::DW_LANG_hi_user;
+  default: break;
   }
+
+  llvm_unreachable("Unhandled language type");
 }
 
 SourceLanguage::SourceLanguage(lldb::LanguageType language_type) {

lldb/unittests/Target/CMakeLists.txt

@@ -2,6 +2,7 @@ add_lldb_unittest(TargetTests
   ABITest.cpp
   DynamicRegisterInfoTest.cpp
   ExecutionContextTest.cpp
+  Language.cpp
   LocateModuleCallbackTest.cpp
   MemoryRegionInfoTest.cpp
   MemoryTest.cpp

lldb/unittests/Target/Language.cpp

@@ -0,0 +1,56 @@
+//===-- LanguageTest.cpp --------------------------------------------------===//
+//
+// 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 "lldb/Target/Language.h"
+#include "lldb/lldb-enumerations.h"
+#include "gtest/gtest.h"
+
+using namespace lldb_private;
+using namespace lldb;
+
+namespace {
+class LanguageTest : public ::testing::Test {};
+} // namespace
+
+TEST_F(LanguageTest, SourceLanguage_GetDescription) {
+  for (uint32_t i = 1; i < lldb::eNumLanguageTypes; ++i) {
+    // 0x29 is unassigned
+    if (i == 0x29)
+      continue;
+
+    auto lang_type = static_cast<lldb::LanguageType>(i);
+    if (lang_type == lldb::eLanguageTypeLastStandardLanguage)
+      continue;
+
+    SourceLanguage lang(lang_type);
+
+    // eLanguageTypeHIP is not implemented as a DW_LNAME because of a conflict.
+    if (lang_type == lldb::eLanguageTypeHIP)
+      EXPECT_FALSE(lang);
+    else
+      EXPECT_TRUE(lang);
+  }
+
+  EXPECT_EQ(SourceLanguage(eLanguageTypeC_plus_plus).GetDescription(),
+            "ISO C++");
+  EXPECT_EQ(SourceLanguage(eLanguageTypeC_plus_plus_17).GetDescription(),
+            "ISO C++");
+  EXPECT_EQ(SourceLanguage(eLanguageTypeC_plus_plus_20).GetDescription(),
+            "ISO C++");
+
+  EXPECT_EQ(SourceLanguage(eLanguageTypeObjC).GetDescription(), "Objective C");
+  EXPECT_EQ(SourceLanguage(eLanguageTypeMipsAssembler).GetDescription(),
+            "Assembly");
+
+  auto next_vendor_language =
+      static_cast<lldb::LanguageType>(eLanguageTypeMipsAssembler + 1);
+  if (next_vendor_language < eNumLanguageTypes)
+    EXPECT_NE(SourceLanguage(next_vendor_language).GetDescription(), "Unknown");
+
+  EXPECT_EQ(SourceLanguage(eLanguageTypeUnknown).GetDescription(), "Unknown");
+}