intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 776 insertions, 0 deletions

diff --git a/contrib/libs/llvm12/utils/TableGen/DirectiveEmitter.cpp b/contrib/libs/llvm12/utils/TableGen/DirectiveEmitter.cpp
new file mode 100644
index 0000000000..c9daa9b241
--- /dev/null
+++ b/contrib/libs/llvm12/utils/TableGen/DirectiveEmitter.cpp
@@ -0,0 +1,776 @@
+//===- DirectiveEmitter.cpp - Directive Language Emitter ------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// DirectiveEmitter uses the descriptions of directives and clauses to construct
+// common code declarations to be used in Frontends.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/TableGen/DirectiveEmitter.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringSet.h"
+#include "llvm/TableGen/Error.h"
+#include "llvm/TableGen/Record.h"
+#include "llvm/TableGen/TableGenBackend.h"
+
+using namespace llvm;
+
+namespace {
+// Simple RAII helper for defining ifdef-undef-endif scopes.
+class IfDefScope {
+public:
+  IfDefScope(StringRef Name, raw_ostream &OS) : Name(Name), OS(OS) {
+    OS << "#ifdef " << Name << "\n"
+       << "#undef " << Name << "\n";
+  }
+
+  ~IfDefScope() { OS << "\n#endif // " << Name << "\n\n"; }
+
+private:
+  StringRef Name;
+  raw_ostream &OS;
+};
+} // end anonymous namespace
+
+namespace llvm {
+
+// Generate enum class
+void GenerateEnumClass(const std::vector<Record *> &Records, raw_ostream &OS,
+                       StringRef Enum, StringRef Prefix,
+                       const DirectiveLanguage &DirLang) {
+  OS << "\n";
+  OS << "enum class " << Enum << " {\n";
+  for (const auto &R : Records) {
+    BaseRecord Rec{R};
+    OS << "  " << Prefix << Rec.getFormattedName() << ",\n";
+  }
+  OS << "};\n";
+  OS << "\n";
+  OS << "static constexpr std::size_t " << Enum
+     << "_enumSize = " << Records.size() << ";\n";
+
+  // Make the enum values available in the defined namespace. This allows us to
+  // write something like Enum_X if we have a `using namespace <CppNamespace>`.
+  // At the same time we do not loose the strong type guarantees of the enum
+  // class, that is we cannot pass an unsigned as Directive without an explicit
+  // cast.
+  if (DirLang.hasMakeEnumAvailableInNamespace()) {
+    OS << "\n";
+    for (const auto &R : Records) {
+      BaseRecord Rec{R};
+      OS << "constexpr auto " << Prefix << Rec.getFormattedName() << " = "
+         << "llvm::" << DirLang.getCppNamespace() << "::" << Enum
+         << "::" << Prefix << Rec.getFormattedName() << ";\n";
+    }
+  }
+}
+
+// Generate enums for values that clauses can take.
+// Also generate function declarations for get<Enum>Name(StringRef Str).
+void GenerateEnumClauseVal(const std::vector<Record *> &Records,
+                           raw_ostream &OS, const DirectiveLanguage &DirLang,
+                           std::string &EnumHelperFuncs) {
+  for (const auto &R : Records) {
+    Clause C{R};
+    const auto &ClauseVals = C.getClauseVals();
+    if (ClauseVals.size() <= 0)
+      continue;
+
+    const auto &EnumName = C.getEnumName();
+    if (EnumName.size() == 0) {
+      PrintError("enumClauseValue field not set in Clause" +
+                 C.getFormattedName() + ".");
+      return;
+    }
+
+    OS << "\n";
+    OS << "enum class " << EnumName << " {\n";
+    for (const auto &CV : ClauseVals) {
+      ClauseVal CVal{CV};
+      OS << "  " << CV->getName() << "=" << CVal.getValue() << ",\n";
+    }
+    OS << "};\n";
+
+    if (DirLang.hasMakeEnumAvailableInNamespace()) {
+      OS << "\n";
+      for (const auto &CV : ClauseVals) {
+        OS << "constexpr auto " << CV->getName() << " = "
+           << "llvm::" << DirLang.getCppNamespace() << "::" << EnumName
+           << "::" << CV->getName() << ";\n";
+      }
+      EnumHelperFuncs += (llvm::Twine(EnumName) + llvm::Twine(" get") +
+                          llvm::Twine(EnumName) + llvm::Twine("(StringRef);\n"))
+                             .str();
+
+      EnumHelperFuncs +=
+          (llvm::Twine("llvm::StringRef get") + llvm::Twine(DirLang.getName()) +
+           llvm::Twine(EnumName) + llvm::Twine("Name(") +
+           llvm::Twine(EnumName) + llvm::Twine(");\n"))
+              .str();
+    }
+  }
+}
+
+bool HasDuplicateClauses(const std::vector<Record *> &Clauses,
+                         const Directive &Directive,
+                         llvm::StringSet<> &CrtClauses) {
+  bool HasError = false;
+  for (const auto &C : Clauses) {
+    VersionedClause VerClause{C};
+    const auto insRes = CrtClauses.insert(VerClause.getClause().getName());
+    if (!insRes.second) {
+      PrintError("Clause " + VerClause.getClause().getRecordName() +
+                 " already defined on directive " + Directive.getRecordName());
+      HasError = true;
+    }
+  }
+  return HasError;
+}
+
+// Check for duplicate clauses in lists. Clauses cannot appear twice in the
+// three allowed list. Also, since required implies allowed, clauses cannot
+// appear in both the allowedClauses and requiredClauses lists.
+bool HasDuplicateClausesInDirectives(const std::vector<Record *> &Directives) {
+  bool HasDuplicate = false;
+  for (const auto &D : Directives) {
+    Directive Dir{D};
+    llvm::StringSet<> Clauses;
+    // Check for duplicates in the three allowed lists.
+    if (HasDuplicateClauses(Dir.getAllowedClauses(), Dir, Clauses) ||
+        HasDuplicateClauses(Dir.getAllowedOnceClauses(), Dir, Clauses) ||
+        HasDuplicateClauses(Dir.getAllowedExclusiveClauses(), Dir, Clauses)) {
+      HasDuplicate = true;
+    }
+    // Check for duplicate between allowedClauses and required
+    Clauses.clear();
+    if (HasDuplicateClauses(Dir.getAllowedClauses(), Dir, Clauses) ||
+        HasDuplicateClauses(Dir.getRequiredClauses(), Dir, Clauses)) {
+      HasDuplicate = true;
+    }
+    if (HasDuplicate)
+      PrintFatalError("One or more clauses are defined multiple times on"
+                      " directive " +
+                      Dir.getRecordName());
+  }
+
+  return HasDuplicate;
+}
+
+// Check consitency of records. Return true if an error has been detected.
+// Return false if the records are valid.
+bool DirectiveLanguage::HasValidityErrors() const {
+  if (getDirectiveLanguages().size() != 1) {
+    PrintFatalError("A single definition of DirectiveLanguage is needed.");
+    return true;
+  }
+
+  return HasDuplicateClausesInDirectives(getDirectives());
+}
+
+// Generate the declaration section for the enumeration in the directive
+// language
+void EmitDirectivesDecl(RecordKeeper &Records, raw_ostream &OS) {
+  const auto DirLang = DirectiveLanguage{Records};
+  if (DirLang.HasValidityErrors())
+    return;
+
+  OS << "#ifndef LLVM_" << DirLang.getName() << "_INC\n";
+  OS << "#define LLVM_" << DirLang.getName() << "_INC\n";
+
+  if (DirLang.hasEnableBitmaskEnumInNamespace())
+    OS << "\n#include \"llvm/ADT/BitmaskEnum.h\"\n";
+
+  OS << "\n";
+  OS << "namespace llvm {\n";
+  OS << "class StringRef;\n";
+
+  // Open namespaces defined in the directive language
+  llvm::SmallVector<StringRef, 2> Namespaces;
+  llvm::SplitString(DirLang.getCppNamespace(), Namespaces, "::");
+  for (auto Ns : Namespaces)
+    OS << "namespace " << Ns << " {\n";
+
+  if (DirLang.hasEnableBitmaskEnumInNamespace())
+    OS << "\nLLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();\n";
+
+  // Emit Directive enumeration
+  GenerateEnumClass(DirLang.getDirectives(), OS, "Directive",
+                    DirLang.getDirectivePrefix(), DirLang);
+
+  // Emit Clause enumeration
+  GenerateEnumClass(DirLang.getClauses(), OS, "Clause",
+                    DirLang.getClausePrefix(), DirLang);
+
+  // Emit ClauseVal enumeration
+  std::string EnumHelperFuncs;
+  GenerateEnumClauseVal(DirLang.getClauses(), OS, DirLang, EnumHelperFuncs);
+
+  // Generic function signatures
+  OS << "\n";
+  OS << "// Enumeration helper functions\n";
+  OS << "Directive get" << DirLang.getName()
+     << "DirectiveKind(llvm::StringRef Str);\n";
+  OS << "\n";
+  OS << "llvm::StringRef get" << DirLang.getName()
+     << "DirectiveName(Directive D);\n";
+  OS << "\n";
+  OS << "Clause get" << DirLang.getName()
+     << "ClauseKind(llvm::StringRef Str);\n";
+  OS << "\n";
+  OS << "llvm::StringRef get" << DirLang.getName() << "ClauseName(Clause C);\n";
+  OS << "\n";
+  OS << "/// Return true if \\p C is a valid clause for \\p D in version \\p "
+     << "Version.\n";
+  OS << "bool isAllowedClauseForDirective(Directive D, "
+     << "Clause C, unsigned Version);\n";
+  OS << "\n";
+  if (EnumHelperFuncs.length() > 0) {
+    OS << EnumHelperFuncs;
+    OS << "\n";
+  }
+
+  // Closing namespaces
+  for (auto Ns : llvm::reverse(Namespaces))
+    OS << "} // namespace " << Ns << "\n";
+
+  OS << "} // namespace llvm\n";
+
+  OS << "#endif // LLVM_" << DirLang.getName() << "_INC\n";
+}
+
+// Generate function implementation for get<Enum>Name(StringRef Str)
+void GenerateGetName(const std::vector<Record *> &Records, raw_ostream &OS,
+                     StringRef Enum, const DirectiveLanguage &DirLang,
+                     StringRef Prefix) {
+  OS << "\n";
+  OS << "llvm::StringRef llvm::" << DirLang.getCppNamespace() << "::get"
+     << DirLang.getName() << Enum << "Name(" << Enum << " Kind) {\n";
+  OS << "  switch (Kind) {\n";
+  for (const auto &R : Records) {
+    BaseRecord Rec{R};
+    OS << "    case " << Prefix << Rec.getFormattedName() << ":\n";
+    OS << "      return \"";
+    if (Rec.getAlternativeName().empty())
+      OS << Rec.getName();
+    else
+      OS << Rec.getAlternativeName();
+    OS << "\";\n";
+  }
+  OS << "  }\n"; // switch
+  OS << "  llvm_unreachable(\"Invalid " << DirLang.getName() << " " << Enum
+     << " kind\");\n";
+  OS << "}\n";
+}
+
+// Generate function implementation for get<Enum>Kind(StringRef Str)
+void GenerateGetKind(const std::vector<Record *> &Records, raw_ostream &OS,
+                     StringRef Enum, const DirectiveLanguage &DirLang,
+                     StringRef Prefix, bool ImplicitAsUnknown) {
+
+  auto DefaultIt = llvm::find_if(
+      Records, [](Record *R) { return R->getValueAsBit("isDefault") == true; });
+
+  if (DefaultIt == Records.end()) {
+    PrintError("At least one " + Enum + " must be defined as default.");
+    return;
+  }
+
+  BaseRecord DefaultRec{(*DefaultIt)};
+
+  OS << "\n";
+  OS << Enum << " llvm::" << DirLang.getCppNamespace() << "::get"
+     << DirLang.getName() << Enum << "Kind(llvm::StringRef Str) {\n";
+  OS << "  return llvm::StringSwitch<" << Enum << ">(Str)\n";
+
+  for (const auto &R : Records) {
+    BaseRecord Rec{R};
+    if (ImplicitAsUnknown && R->getValueAsBit("isImplicit")) {
+      OS << "    .Case(\"" << Rec.getName() << "\"," << Prefix
+         << DefaultRec.getFormattedName() << ")\n";
+    } else {
+      OS << "    .Case(\"" << Rec.getName() << "\"," << Prefix
+         << Rec.getFormattedName() << ")\n";
+    }
+  }
+  OS << "    .Default(" << Prefix << DefaultRec.getFormattedName() << ");\n";
+  OS << "}\n";
+}
+
+// Generate function implementation for get<ClauseVal>Kind(StringRef Str)
+void GenerateGetKindClauseVal(const DirectiveLanguage &DirLang,
+                              raw_ostream &OS) {
+  for (const auto &R : DirLang.getClauses()) {
+    Clause C{R};
+    const auto &ClauseVals = C.getClauseVals();
+    if (ClauseVals.size() <= 0)
+      continue;
+
+    auto DefaultIt = llvm::find_if(ClauseVals, [](Record *CV) {
+      return CV->getValueAsBit("isDefault") == true;
+    });
+
+    if (DefaultIt == ClauseVals.end()) {
+      PrintError("At least one val in Clause " + C.getFormattedName() +
+                 " must be defined as default.");
+      return;
+    }
+    const auto DefaultName = (*DefaultIt)->getName();
+
+    const auto &EnumName = C.getEnumName();
+    if (EnumName.size() == 0) {
+      PrintError("enumClauseValue field not set in Clause" +
+                 C.getFormattedName() + ".");
+      return;
+    }
+
+    OS << "\n";
+    OS << EnumName << " llvm::" << DirLang.getCppNamespace() << "::get"
+       << EnumName << "(llvm::StringRef Str) {\n";
+    OS << "  return llvm::StringSwitch<" << EnumName << ">(Str)\n";
+    for (const auto &CV : ClauseVals) {
+      ClauseVal CVal{CV};
+      OS << "    .Case(\"" << CVal.getFormattedName() << "\"," << CV->getName()
+         << ")\n";
+    }
+    OS << "    .Default(" << DefaultName << ");\n";
+    OS << "}\n";
+
+    OS << "\n";
+    OS << "llvm::StringRef llvm::" << DirLang.getCppNamespace() << "::get"
+       << DirLang.getName() << EnumName
+       << "Name(llvm::" << DirLang.getCppNamespace() << "::" << EnumName
+       << " x) {\n";
+    OS << "  switch (x) {\n";
+    for (const auto &CV : ClauseVals) {
+      ClauseVal CVal{CV};
+      OS << "    case " << CV->getName() << ":\n";
+      OS << "      return \"" << CVal.getFormattedName() << "\";\n";
+    }
+    OS << "  }\n"; // switch
+    OS << "  llvm_unreachable(\"Invalid " << DirLang.getName() << " "
+       << EnumName << " kind\");\n";
+    OS << "}\n";
+  }
+}
+
+void GenerateCaseForVersionedClauses(const std::vector<Record *> &Clauses,
+                                     raw_ostream &OS, StringRef DirectiveName,
+                                     const DirectiveLanguage &DirLang,
+                                     llvm::StringSet<> &Cases) {
+  for (const auto &C : Clauses) {
+    VersionedClause VerClause{C};
+
+    const auto ClauseFormattedName = VerClause.getClause().getFormattedName();
+
+    if (Cases.find(ClauseFormattedName) == Cases.end()) {
+      Cases.insert(ClauseFormattedName);
+      OS << "        case " << DirLang.getClausePrefix() << ClauseFormattedName
+         << ":\n";
+      OS << "          return " << VerClause.getMinVersion()
+         << " <= Version && " << VerClause.getMaxVersion() << " >= Version;\n";
+    }
+  }
+}
+
+// Generate the isAllowedClauseForDirective function implementation.
+void GenerateIsAllowedClause(const DirectiveLanguage &DirLang,
+                             raw_ostream &OS) {
+  OS << "\n";
+  OS << "bool llvm::" << DirLang.getCppNamespace()
+     << "::isAllowedClauseForDirective("
+     << "Directive D, Clause C, unsigned Version) {\n";
+  OS << "  assert(unsigned(D) <= llvm::" << DirLang.getCppNamespace()
+     << "::Directive_enumSize);\n";
+  OS << "  assert(unsigned(C) <= llvm::" << DirLang.getCppNamespace()
+     << "::Clause_enumSize);\n";
+
+  OS << "  switch (D) {\n";
+
+  for (const auto &D : DirLang.getDirectives()) {
+    Directive Dir{D};
+
+    OS << "    case " << DirLang.getDirectivePrefix() << Dir.getFormattedName()
+       << ":\n";
+    if (Dir.getAllowedClauses().size() == 0 &&
+        Dir.getAllowedOnceClauses().size() == 0 &&
+        Dir.getAllowedExclusiveClauses().size() == 0 &&
+        Dir.getRequiredClauses().size() == 0) {
+      OS << "      return false;\n";
+    } else {
+      OS << "      switch (C) {\n";
+
+      llvm::StringSet<> Cases;
+
+      GenerateCaseForVersionedClauses(Dir.getAllowedClauses(), OS,
+                                      Dir.getName(), DirLang, Cases);
+
+      GenerateCaseForVersionedClauses(Dir.getAllowedOnceClauses(), OS,
+                                      Dir.getName(), DirLang, Cases);
+
+      GenerateCaseForVersionedClauses(Dir.getAllowedExclusiveClauses(), OS,
+                                      Dir.getName(), DirLang, Cases);
+
+      GenerateCaseForVersionedClauses(Dir.getRequiredClauses(), OS,
+                                      Dir.getName(), DirLang, Cases);
+
+      OS << "        default:\n";
+      OS << "          return false;\n";
+      OS << "      }\n"; // End of clauses switch
+    }
+    OS << "      break;\n";
+  }
+
+  OS << "  }\n"; // End of directives switch
+  OS << "  llvm_unreachable(\"Invalid " << DirLang.getName()
+     << " Directive kind\");\n";
+  OS << "}\n"; // End of function isAllowedClauseForDirective
+}
+
+// Generate a simple enum set with the give clauses.
+void GenerateClauseSet(const std::vector<Record *> &Clauses, raw_ostream &OS,
+                       StringRef ClauseSetPrefix, Directive &Dir,
+                       const DirectiveLanguage &DirLang) {
+
+  OS << "\n";
+  OS << "  static " << DirLang.getClauseEnumSetClass() << " " << ClauseSetPrefix
+     << DirLang.getDirectivePrefix() << Dir.getFormattedName() << " {\n";
+
+  for (const auto &C : Clauses) {
+    VersionedClause VerClause{C};
+    OS << "    llvm::" << DirLang.getCppNamespace()
+       << "::Clause::" << DirLang.getClausePrefix()
+       << VerClause.getClause().getFormattedName() << ",\n";
+  }
+  OS << "  };\n";
+}
+
+// Generate an enum set for the 4 kinds of clauses linked to a directive.
+void GenerateDirectiveClauseSets(const DirectiveLanguage &DirLang,
+                                 raw_ostream &OS) {
+
+  IfDefScope Scope("GEN_FLANG_DIRECTIVE_CLAUSE_SETS", OS);
+
+  OS << "\n";
+  OS << "namespace llvm {\n";
+
+  // Open namespaces defined in the directive language.
+  llvm::SmallVector<StringRef, 2> Namespaces;
+  llvm::SplitString(DirLang.getCppNamespace(), Namespaces, "::");
+  for (auto Ns : Namespaces)
+    OS << "namespace " << Ns << " {\n";
+
+  for (const auto &D : DirLang.getDirectives()) {
+    Directive Dir{D};
+
+    OS << "\n";
+    OS << "  // Sets for " << Dir.getName() << "\n";
+
+    GenerateClauseSet(Dir.getAllowedClauses(), OS, "allowedClauses_", Dir,
+                      DirLang);
+    GenerateClauseSet(Dir.getAllowedOnceClauses(), OS, "allowedOnceClauses_",
+                      Dir, DirLang);
+    GenerateClauseSet(Dir.getAllowedExclusiveClauses(), OS,
+                      "allowedExclusiveClauses_", Dir, DirLang);
+    GenerateClauseSet(Dir.getRequiredClauses(), OS, "requiredClauses_", Dir,
+                      DirLang);
+  }
+
+  // Closing namespaces
+  for (auto Ns : llvm::reverse(Namespaces))
+    OS << "} // namespace " << Ns << "\n";
+
+  OS << "} // namespace llvm\n";
+}
+
+// Generate a map of directive (key) with DirectiveClauses struct as values.
+// The struct holds the 4 sets of enumeration for the 4 kinds of clauses
+// allowances (allowed, allowed once, allowed exclusive and required).
+void GenerateDirectiveClauseMap(const DirectiveLanguage &DirLang,
+                                raw_ostream &OS) {
+
+  IfDefScope Scope("GEN_FLANG_DIRECTIVE_CLAUSE_MAP", OS);
+
+  OS << "\n";
+  OS << "{\n";
+
+  for (const auto &D : DirLang.getDirectives()) {
+    Directive Dir{D};
+    OS << "  {llvm::" << DirLang.getCppNamespace()
+       << "::Directive::" << DirLang.getDirectivePrefix()
+       << Dir.getFormattedName() << ",\n";
+    OS << "    {\n";
+    OS << "      llvm::" << DirLang.getCppNamespace() << "::allowedClauses_"
+       << DirLang.getDirectivePrefix() << Dir.getFormattedName() << ",\n";
+    OS << "      llvm::" << DirLang.getCppNamespace() << "::allowedOnceClauses_"
+       << DirLang.getDirectivePrefix() << Dir.getFormattedName() << ",\n";
+    OS << "      llvm::" << DirLang.getCppNamespace()
+       << "::allowedExclusiveClauses_" << DirLang.getDirectivePrefix()
+       << Dir.getFormattedName() << ",\n";
+    OS << "      llvm::" << DirLang.getCppNamespace() << "::requiredClauses_"
+       << DirLang.getDirectivePrefix() << Dir.getFormattedName() << ",\n";
+    OS << "    }\n";
+    OS << "  },\n";
+  }
+
+  OS << "}\n";
+}
+
+// Generate classes entry for Flang clauses in the Flang parse-tree
+// If the clause as a non-generic class, no entry is generated.
+// If the clause does not hold a value, an EMPTY_CLASS is used.
+// If the clause class is generic then a WRAPPER_CLASS is used. When the value
+// is optional, the value class is wrapped into a std::optional.
+void GenerateFlangClauseParserClass(const DirectiveLanguage &DirLang,
+                                    raw_ostream &OS) {
+
+  IfDefScope Scope("GEN_FLANG_CLAUSE_PARSER_CLASSES", OS);
+
+  OS << "\n";
+
+  for (const auto &C : DirLang.getClauses()) {
+    Clause Clause{C};
+    if (!Clause.getFlangClass().empty()) {
+      OS << "WRAPPER_CLASS(" << Clause.getFormattedParserClassName() << ", ";
+      if (Clause.isValueOptional() && Clause.isValueList()) {
+        OS << "std::optional<std::list<" << Clause.getFlangClass() << ">>";
+      } else if (Clause.isValueOptional()) {
+        OS << "std::optional<" << Clause.getFlangClass() << ">";
+      } else if (Clause.isValueList()) {
+        OS << "std::list<" << Clause.getFlangClass() << ">";
+      } else {
+        OS << Clause.getFlangClass();
+      }
+    } else {
+      OS << "EMPTY_CLASS(" << Clause.getFormattedParserClassName();
+    }
+    OS << ");\n";
+  }
+}
+
+// Generate a list of the different clause classes for Flang.
+void GenerateFlangClauseParserClassList(const DirectiveLanguage &DirLang,
+                                        raw_ostream &OS) {
+
+  IfDefScope Scope("GEN_FLANG_CLAUSE_PARSER_CLASSES_LIST", OS);
+
+  OS << "\n";
+  llvm::interleaveComma(DirLang.getClauses(), OS, [&](Record *C) {
+    Clause Clause{C};
+    OS << Clause.getFormattedParserClassName() << "\n";
+  });
+}
+
+// Generate dump node list for the clauses holding a generic class name.
+void GenerateFlangClauseDump(const DirectiveLanguage &DirLang,
+                             raw_ostream &OS) {
+
+  IfDefScope Scope("GEN_FLANG_DUMP_PARSE_TREE_CLAUSES", OS);
+
+  OS << "\n";
+  for (const auto &C : DirLang.getClauses()) {
+    Clause Clause{C};
+    OS << "NODE(" << DirLang.getFlangClauseBaseClass() << ", "
+       << Clause.getFormattedParserClassName() << ")\n";
+  }
+}
+
+// Generate Unparse functions for clauses classes in the Flang parse-tree
+// If the clause is a non-generic class, no entry is generated.
+void GenerateFlangClauseUnparse(const DirectiveLanguage &DirLang,
+                                raw_ostream &OS) {
+
+  IfDefScope Scope("GEN_FLANG_CLAUSE_UNPARSE", OS);
+
+  OS << "\n";
+
+  for (const auto &C : DirLang.getClauses()) {
+    Clause Clause{C};
+    if (!Clause.getFlangClass().empty()) {
+      if (Clause.isValueOptional() && Clause.getDefaultValue().empty()) {
+        OS << "void Unparse(const " << DirLang.getFlangClauseBaseClass()
+           << "::" << Clause.getFormattedParserClassName() << " &x) {\n";
+        OS << "  Word(\"" << Clause.getName().upper() << "\");\n";
+
+        OS << "  Walk(\"(\", x.v, \")\");\n";
+        OS << "}\n";
+      } else if (Clause.isValueOptional()) {
+        OS << "void Unparse(const " << DirLang.getFlangClauseBaseClass()
+           << "::" << Clause.getFormattedParserClassName() << " &x) {\n";
+        OS << "  Word(\"" << Clause.getName().upper() << "\");\n";
+        OS << "  Put(\"(\");\n";
+        OS << "  if (x.v.has_value())\n";
+        if (Clause.isValueList())
+          OS << "    Walk(x.v, \",\");\n";
+        else
+          OS << "    Walk(x.v);\n";
+        OS << "  else\n";
+        OS << "    Put(\"" << Clause.getDefaultValue() << "\");\n";
+        OS << "  Put(\")\");\n";
+        OS << "}\n";
+      } else {
+        OS << "void Unparse(const " << DirLang.getFlangClauseBaseClass()
+           << "::" << Clause.getFormattedParserClassName() << " &x) {\n";
+        OS << "  Word(\"" << Clause.getName().upper() << "\");\n";
+        OS << "  Put(\"(\");\n";
+        if (Clause.isValueList())
+          OS << "  Walk(x.v, \",\");\n";
+        else
+          OS << "  Walk(x.v);\n";
+        OS << "  Put(\")\");\n";
+        OS << "}\n";
+      }
+    } else {
+      OS << "void Before(const " << DirLang.getFlangClauseBaseClass()
+         << "::" << Clause.getFormattedParserClassName() << " &) { Word(\""
+         << Clause.getName().upper() << "\"); }\n";
+    }
+  }
+}
+
+// Generate the implementation section for the enumeration in the directive
+// language
+void EmitDirectivesFlangImpl(const DirectiveLanguage &DirLang,
+                             raw_ostream &OS) {
+
+  GenerateDirectiveClauseSets(DirLang, OS);
+
+  GenerateDirectiveClauseMap(DirLang, OS);
+
+  GenerateFlangClauseParserClass(DirLang, OS);
+
+  GenerateFlangClauseParserClassList(DirLang, OS);
+
+  GenerateFlangClauseDump(DirLang, OS);
+
+  GenerateFlangClauseUnparse(DirLang, OS);
+}
+
+void GenerateClauseClassMacro(const DirectiveLanguage &DirLang,
+                              raw_ostream &OS) {
+  // Generate macros style information for legacy code in clang
+  IfDefScope Scope("GEN_CLANG_CLAUSE_CLASS", OS);
+
+  OS << "\n";
+
+  OS << "#ifndef CLAUSE\n";
+  OS << "#define CLAUSE(Enum, Str, Implicit)\n";
+  OS << "#endif\n";
+  OS << "#ifndef CLAUSE_CLASS\n";
+  OS << "#define CLAUSE_CLASS(Enum, Str, Class)\n";
+  OS << "#endif\n";
+  OS << "#ifndef CLAUSE_NO_CLASS\n";
+  OS << "#define CLAUSE_NO_CLASS(Enum, Str)\n";
+  OS << "#endif\n";
+  OS << "\n";
+  OS << "#define __CLAUSE(Name, Class)                      \\\n";
+  OS << "  CLAUSE(" << DirLang.getClausePrefix()
+     << "##Name, #Name, /* Implicit */ false) \\\n";
+  OS << "  CLAUSE_CLASS(" << DirLang.getClausePrefix()
+     << "##Name, #Name, Class)\n";
+  OS << "#define __CLAUSE_NO_CLASS(Name)                    \\\n";
+  OS << "  CLAUSE(" << DirLang.getClausePrefix()
+     << "##Name, #Name, /* Implicit */ false) \\\n";
+  OS << "  CLAUSE_NO_CLASS(" << DirLang.getClausePrefix() << "##Name, #Name)\n";
+  OS << "#define __IMPLICIT_CLAUSE_CLASS(Name, Str, Class)  \\\n";
+  OS << "  CLAUSE(" << DirLang.getClausePrefix()
+     << "##Name, Str, /* Implicit */ true)    \\\n";
+  OS << "  CLAUSE_CLASS(" << DirLang.getClausePrefix()
+     << "##Name, Str, Class)\n";
+  OS << "#define __IMPLICIT_CLAUSE_NO_CLASS(Name, Str)      \\\n";
+  OS << "  CLAUSE(" << DirLang.getClausePrefix()
+     << "##Name, Str, /* Implicit */ true)    \\\n";
+  OS << "  CLAUSE_NO_CLASS(" << DirLang.getClausePrefix() << "##Name, Str)\n";
+  OS << "\n";
+
+  for (const auto &R : DirLang.getClauses()) {
+    Clause C{R};
+    if (C.getClangClass().empty()) { // NO_CLASS
+      if (C.isImplicit()) {
+        OS << "__IMPLICIT_CLAUSE_NO_CLASS(" << C.getFormattedName() << ", \""
+           << C.getFormattedName() << "\")\n";
+      } else {
+        OS << "__CLAUSE_NO_CLASS(" << C.getFormattedName() << ")\n";
+      }
+    } else { // CLASS
+      if (C.isImplicit()) {
+        OS << "__IMPLICIT_CLAUSE_CLASS(" << C.getFormattedName() << ", \""
+           << C.getFormattedName() << "\", " << C.getClangClass() << ")\n";
+      } else {
+        OS << "__CLAUSE(" << C.getFormattedName() << ", " << C.getClangClass()
+           << ")\n";
+      }
+    }
+  }
+
+  OS << "\n";
+  OS << "#undef __IMPLICIT_CLAUSE_NO_CLASS\n";
+  OS << "#undef __IMPLICIT_CLAUSE_CLASS\n";
+  OS << "#undef __CLAUSE\n";
+  OS << "#undef CLAUSE_NO_CLASS\n";
+  OS << "#undef CLAUSE_CLASS\n";
+  OS << "#undef CLAUSE\n";
+}
+
+// Generate the implementation section for the enumeration in the directive
+// language.
+void EmitDirectivesGen(RecordKeeper &Records, raw_ostream &OS) {
+  const auto DirLang = DirectiveLanguage{Records};
+  if (DirLang.HasValidityErrors())
+    return;
+
+  EmitDirectivesFlangImpl(DirLang, OS);
+
+  GenerateClauseClassMacro(DirLang, OS);
+}
+
+// Generate the implementation for the enumeration in the directive
+// language. This code can be included in library.
+void EmitDirectivesImpl(RecordKeeper &Records, raw_ostream &OS) {
+  const auto DirLang = DirectiveLanguage{Records};
+  if (DirLang.HasValidityErrors())
+    return;
+
+  if (!DirLang.getIncludeHeader().empty())
+    OS << "#include \"" << DirLang.getIncludeHeader() << "\"\n\n";
+
+  OS << "#include \"llvm/ADT/StringRef.h\"\n";
+  OS << "#include \"llvm/ADT/StringSwitch.h\"\n";
+  OS << "#include \"llvm/Support/ErrorHandling.h\"\n";
+  OS << "\n";
+  OS << "using namespace llvm;\n";
+  llvm::SmallVector<StringRef, 2> Namespaces;
+  llvm::SplitString(DirLang.getCppNamespace(), Namespaces, "::");
+  for (auto Ns : Namespaces)
+    OS << "using namespace " << Ns << ";\n";
+
+  // getDirectiveKind(StringRef Str)
+  GenerateGetKind(DirLang.getDirectives(), OS, "Directive", DirLang,
+                  DirLang.getDirectivePrefix(), /*ImplicitAsUnknown=*/false);
+
+  // getDirectiveName(Directive Kind)
+  GenerateGetName(DirLang.getDirectives(), OS, "Directive", DirLang,
+                  DirLang.getDirectivePrefix());
+
+  // getClauseKind(StringRef Str)
+  GenerateGetKind(DirLang.getClauses(), OS, "Clause", DirLang,
+                  DirLang.getClausePrefix(),
+                  /*ImplicitAsUnknown=*/true);
+
+  // getClauseName(Clause Kind)
+  GenerateGetName(DirLang.getClauses(), OS, "Clause", DirLang,
+                  DirLang.getClausePrefix());
+
+  // get<ClauseVal>Kind(StringRef Str)
+  GenerateGetKindClauseVal(DirLang, OS);
+
+  // isAllowedClauseForDirective(Directive D, Clause C, unsigned Version)
+  GenerateIsAllowedClause(DirLang, OS);
+}
+
+} // namespace llvm