Move the DebugEmissionKind enum from DIBuilder into DICompileUnit.

This mostly cosmetic patch moves the DebugEmissionKind enum from DIBuilder
into DICompileUnit. DIBuilder is not the right place for this enum to live
in — a metadata consumer should not have to include DIBuilder.h.
I also added a Verifier check that checks that the emission kind of a
DICompileUnit is actually legal.

http://reviews.llvm.org/D18612
<rdar://problem/25427165>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265077 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 30 insertions, 3 deletions

diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index 46ffc642ec6..5ad5ddd52a0 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -787,11 +787,15 @@ lltok::Kind LLLexer::LexIdentifier() {
   DWKEYWORD(OP, DwarfOp);
   DWKEYWORD(MACINFO, DwarfMacinfo);
 #undef DWKEYWORD
-
   if (Keyword.startswith("DIFlag")) {
     StrVal.assign(Keyword.begin(), Keyword.end());
     return lltok::DIFlag;
   }
+  if (Keyword == "NoDebug" || Keyword == "FullDebug" ||
+      Keyword == "LineTablesOnly") {
+    StrVal.assign(Keyword.begin(), Keyword.end());
+    return lltok::EmissionKind;
+  }
 
   // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
   // the CFE to avoid forcing it to deal with 64-bit numbers.
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index 39c613599e6..e72686d045c 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -3260,6 +3260,9 @@ struct DwarfVirtualityField : public MDUnsignedField {
 struct DwarfLangField : public MDUnsignedField {
   DwarfLangField() : MDUnsignedField(0, dwarf::DW_LANG_hi_user) {}
 };
+struct EmissionKindField : public MDUnsignedField {
+  EmissionKindField() : MDUnsignedField(0, DICompileUnit::LastEmissionKind) {}
+};
 
 struct DIFlagField : public MDUnsignedField {
   DIFlagField() : MDUnsignedField(0, UINT32_MAX) {}
@@ -3400,6 +3403,24 @@ bool LLParser::ParseMDField(LocTy Loc, StringRef Name, DwarfLangField &Result) {
 }
 
 template <>
+bool LLParser::ParseMDField(LocTy Loc, StringRef Name, EmissionKindField &Result) {
+  if (Lex.getKind() == lltok::APSInt)
+    return ParseMDField(Loc, Name, static_cast<MDUnsignedField &>(Result));
+
+  if (Lex.getKind() != lltok::EmissionKind)
+    return TokError("expected emission kind");
+
+  auto Kind = DICompileUnit::getEmissionKind(Lex.getStrVal());
+  if (!Kind)
+    return TokError("invalid emission kind" + Twine(" '") + Lex.getStrVal() +
+                    "'");
+  assert(*Kind <= Result.Max && "Expected valid emission kind");
+  Result.assign(*Kind);
+  Lex.Lex();
+  return false;
+}
+  
+template <>
 bool LLParser::ParseMDField(LocTy Loc, StringRef Name,
                             DwarfAttEncodingField &Result) {
   if (Lex.getKind() == lltok::APSInt)
@@ -3772,7 +3793,8 @@ bool LLParser::ParseDIFile(MDNode *&Result, bool IsDistinct) {
 /// ParseDICompileUnit:
 ///   ::= !DICompileUnit(language: DW_LANG_C99, file: !0, producer: "clang",
 ///                      isOptimized: true, flags: "-O2", runtimeVersion: 1,
-///                      splitDebugFilename: "abc.debug", emissionKind: 1,
+///                      splitDebugFilename: "abc.debug",
+///                      emissionKind: FullDebug,
 ///                      enums: !1, retainedTypes: !2, subprograms: !3,
 ///                      globals: !4, imports: !5, macros: !6, dwoId: 0x0abcd)
 bool LLParser::ParseDICompileUnit(MDNode *&Result, bool IsDistinct) {
@@ -3787,7 +3809,7 @@ bool LLParser::ParseDICompileUnit(MDNode *&Result, bool IsDistinct) {
   OPTIONAL(flags, MDStringField, );                                            \
   OPTIONAL(runtimeVersion, MDUnsignedField, (0, UINT32_MAX));                  \
   OPTIONAL(splitDebugFilename, MDStringField, );                               \
-  OPTIONAL(emissionKind, MDUnsignedField, (0, UINT32_MAX));                    \
+  OPTIONAL(emissionKind, EmissionKindField, );                                 \
   OPTIONAL(enums, MDField, );                                                  \
   OPTIONAL(retainedTypes, MDField, );                                          \
   OPTIONAL(subprograms, MDField, );                                            \
diff --git a/lib/AsmParser/LLToken.h b/lib/AsmParser/LLToken.h
index c5a74901985..4df922b1c78 100644
--- a/lib/AsmParser/LLToken.h
+++ b/lib/AsmParser/LLToken.h
@@ -221,6 +221,7 @@ namespace lltok {
     DwarfAttEncoding,  // DW_ATE_foo
     DwarfVirtuality,   // DW_VIRTUALITY_foo
     DwarfLang,         // DW_LANG_foo
+    EmissionKind,      // lineTablesOnly
     DwarfOp,           // DW_OP_foo
     DIFlag,            // DIFlagFoo
     DwarfMacinfo,      // DW_MACINFO_foo