LDC: Cherry-pick CodeView D language support (svn308890)

llvm-mirror/llvm@7811635

[codeview] Emit 'D' as the cv source language for D code

This matches DMD:
https://github.com/dlang/dmd/blob/522263965cf3a27ed16b31f3c3562db86cdeabec/src/ddmd/backend/cv8.c#L199

Fixes PR33899.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308890 91177308-0d34-0410-b5e6-96231b3b80d8

Author: rnk

include/llvm/DebugInfo/CodeView/CodeView.h

@@ -151,7 +151,11 @@ enum SourceLanguage : uint8_t {
   Java = 0x0d,
   JScript = 0x0e,
   MSIL = 0x0f,
-  HLSL = 0x10
+  HLSL = 0x10,
+
+  /// The DMD compiler emits 'D' for the CV source language. Microsoft doesn't
+  /// have an enumerator for it yet.
+  D = 'D',
 };
 
 /// These values correspond to the CV_call_e enumeration, and are documented

lib/CodeGen/AsmPrinter/CodeViewDebug.cpp

@@ -541,6 +541,8 @@ static SourceLanguage MapDWLangToCVLang(unsigned DWLang) {
     return SourceLanguage::Cobol;
   case dwarf::DW_LANG_Java:
     return SourceLanguage::Java;
+  case dwarf::DW_LANG_D:
+    return SourceLanguage::D;
   default:
     // There's no CodeView representation for this language, and CV doesn't
     // have an "unknown" option for the language field, so we'll use MASM,

lib/DebugInfo/CodeView/EnumTables.cpp

@@ -123,7 +123,7 @@ static const EnumEntry<codeview::SourceLanguage> SourceLanguages[] = {
     CV_ENUM_ENT(SourceLanguage, CSharp),  CV_ENUM_ENT(SourceLanguage, VB),
     CV_ENUM_ENT(SourceLanguage, ILAsm),   CV_ENUM_ENT(SourceLanguage, Java),
     CV_ENUM_ENT(SourceLanguage, JScript), CV_ENUM_ENT(SourceLanguage, MSIL),
-    CV_ENUM_ENT(SourceLanguage, HLSL),
+    CV_ENUM_ENT(SourceLanguage, HLSL),    CV_ENUM_ENT(SourceLanguage, D),
 };
 
 static const EnumEntry<uint32_t> CompileSym2FlagNames[] = {