TCling.cxx

Go to the documentation of this file.

// @(#)root/meta:$Id$
// vim: sw=3 ts=3 expandtab foldmethod=indent
 
/*************************************************************************
 * Copyright (C) 1995-2012, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
/** \class TCling
 
This class defines an interface to the cling C++ interpreter.
 
Cling is a full ANSI compliant C++-11 interpreter based on
clang/LLVM technology.
*/
 
#include "TCling.h"
 
#include "ROOT/FoundationUtils.hxx"
 
#include "TClingBaseClassInfo.h"
#include "TClingCallFunc.h"
#include "TClingClassInfo.h"
#include "TClingDataMemberInfo.h"
#include "TClingMethodArgInfo.h"
#include "TClingMethodInfo.h"
#include "TClingRdictModuleFileExtension.h"
#include "TClingTypedefInfo.h"
#include "TClingTypeInfo.h"
#include "TClingValue.h"
 
#include "TROOT.h"
#include "TApplication.h"
#include "TGlobal.h"
#include "TDataType.h"
#include "TClass.h"
#include "TClassEdit.h"
#include "TClassTable.h"
#include "TClingCallbacks.h"
#include "TBaseClass.h"
#include "TDataMember.h"
#include "TMemberInspector.h"
#include "TMethod.h"
#include "TMethodArg.h"
#include "TFunctionTemplate.h"
#include "TObjArray.h"
#include "TObjString.h"
#include "TString.h"
#include "THashList.h"
#include "TVirtualPad.h"
#include "TSystem.h"
#include "TVirtualMutex.h"
#include "TError.h"
#include "TEnv.h"
#include "TEnum.h"
#include "TEnumConstant.h"
#include "THashTable.h"
#include "RConversionRuleParser.h"
#include "RConfigure.h"
#include "compiledata.h"
#include "TClingUtils.h"
#include "TVirtualCollectionProxy.h"
#include "TVirtualStreamerInfo.h"
#include "TListOfDataMembers.h"
#include "TListOfEnums.h"
#include "TListOfEnumsWithLock.h"
#include "TListOfFunctions.h"
#include "TListOfFunctionTemplates.h"
#include "TMemFile.h"
#include "TProtoClass.h"
#include "TStreamerInfo.h" // This is here to avoid to use the plugin manager
#include "ThreadLocalStorage.h"
#include "TFile.h"
#include "TKey.h"
#include "ClingRAII.h"
 
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclarationName.h"
#include "clang/AST/GlobalDecl.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/Type.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/Specifiers.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/CodeGen/ModuleBuilder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Parse/Parser.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Sema.h"
#include "clang/Serialization/ASTReader.h"
#include "clang/Serialization/GlobalModuleIndex.h"
 
#include "cling/Interpreter/ClangInternalState.h"
#include "cling/Interpreter/DynamicLibraryManager.h"
#include "cling/Interpreter/Interpreter.h"
#include "cling/Interpreter/LookupHelper.h"
#include "cling/Interpreter/Value.h"
#include "cling/Interpreter/Transaction.h"
#include "cling/MetaProcessor/MetaProcessor.h"
#include "cling/Utils/AST.h"
#include "cling/Utils/ParserStateRAII.h"
#include "cling/Utils/SourceNormalization.h"
#include "cling/Interpreter/Exception.h"
 
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Module.h"
 
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/SymbolicFile.h"
#include "llvm/Support/FileSystem.h"
 
#include <algorithm>
#include <iostream>
#include <cassert>
#include <map>
#include <set>
#include <stdexcept>
#include <stdint.h>
#include <fstream>
#include <sstream>
#include <string>
#include <tuple>
#include <typeinfo>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include <functional>
 
#ifndef R__WIN32
#include <cxxabi.h>
#define R__DLLEXPORT __attribute__ ((visibility ("default")))
#include <sys/stat.h>
#endif
#include <limits.h>
#include <stdio.h>
 
#ifdef __APPLE__
#include <dlfcn.h>
#include <mach-o/dyld.h>
#include <mach-o/loader.h>
#endif // __APPLE__
 
#ifdef R__UNIX
#include <dlfcn.h>
#endif
 
#ifdef R__LINUX
# ifndef _GNU_SOURCE
#  define _GNU_SOURCE
# endif
# include <link.h> // dl_iterate_phdr()
#endif
 
#if defined(__CYGWIN__)
#include <sys/cygwin.h>
#define HMODULE void *
extern "C" {
   __declspec(dllimport) void * __stdcall GetCurrentProcess();
   __declspec(dllimport) bool __stdcall EnumProcessModules(void *, void **, unsigned long, unsigned long *);
   __declspec(dllimport) unsigned long __stdcall GetModuleFileNameExW(void *, void *, wchar_t *, unsigned long);
}
#endif
 
// Fragment copied from LLVM's raw_ostream.cpp
#if defined(_MSC_VER)
#ifndef STDIN_FILENO
# define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
# define STDOUT_FILENO 1
#endif
#ifndef STDERR_FILENO
# define STDERR_FILENO 2
#endif
#ifndef R__WIN32
//#if defined(HAVE_UNISTD_H)
# include <unistd.h>
//#endif
#else
#include "Windows4Root.h"
#include <Psapi.h>
#undef GetModuleFileName
#define RTLD_DEFAULT ((void *)::GetModuleHandle(NULL))
#define dlsym(library, function_name) ::GetProcAddress((HMODULE)library, function_name)
#define dlopen(library_name, flags) ::LoadLibraryA(library_name)
#define dlclose(library) ::FreeLibrary((HMODULE)library)
#define R__DLLEXPORT __declspec(dllexport)
#endif
#endif
 
//______________________________________________________________________________
// Infrastructure to detect and react to libCling being teared down.
//
namespace {
   class TCling_UnloadMarker {
   public:
      ~~TCling_UnloadMarker() {
         if (ROOT::Internal::gROOTLocal) {
            ROOT::Internal::gROOTLocal->~TROOT();
         }
      }
   };
   static TCling_UnloadMarker gTClingUnloadMarker;
}
 
 
 
//______________________________________________________________________________
// These functions are helpers for debugging issues with non-LLVMDEV builds.
//
R__DLLEXPORT clang::DeclContext* TCling__DEBUG__getDeclContext(clang::Decl* D) {
   return D->getDeclContext();
}
R__DLLEXPORT clang::NamespaceDecl* TCling__DEBUG__DCtoNamespace(clang::DeclContext* DC) {
   return llvm::dyn_cast<clang::NamespaceDecl>(DC);
}
R__DLLEXPORT clang::RecordDecl* TCling__DEBUG__DCtoRecordDecl(clang::DeclContext* DC) {
   return llvm::dyn_cast<clang::RecordDecl>(DC);
}
R__DLLEXPORT void TCling__DEBUG__dump(clang::DeclContext* DC) {
   return DC->dumpDeclContext();
}
R__DLLEXPORT void TCling__DEBUG__dump(clang::Decl* D) {
   return D->dump();
}
R__DLLEXPORT void TCling__DEBUG__dump(clang::FunctionDecl* FD) {
   return FD->dump();
}
R__DLLEXPORT void TCling__DEBUG__decl_dump(void* D) {
   return ((clang::Decl*)D)->dump();
}
R__DLLEXPORT void TCling__DEBUG__printName(clang::Decl* D) {
   if (clang::NamedDecl* ND = llvm::dyn_cast<clang::NamedDecl>(D)) {
      std::string name;
      {
         llvm::raw_string_ostream OS(name);
         ND->getNameForDiagnostic(OS, D->getASTContext().getPrintingPolicy(),
                                  true /*Qualified*/);
      }
      printf("%s\n", name.c_str());
   }
}
//______________________________________________________________________________
// These functions are helpers for testing issues directly rather than
// relying on side effects.
// This is used for the test for ROOT-7462/ROOT-6070
R__DLLEXPORT bool TCling__TEST_isInvalidDecl(clang::Decl* D) {
   return D->isInvalidDecl();
}
R__DLLEXPORT bool TCling__TEST_isInvalidDecl(ClassInfo_t *input) {
   TClingClassInfo *info( (TClingClassInfo*) input);
   assert(info && info->IsValid());
   return info->GetDecl()->isInvalidDecl();
}
 
using namespace std;
using namespace clang;
using namespace ROOT;
 
namespace {
  static const std::string gInterpreterClassDef = R"ICF(
#undef ClassDef
#define ClassDef(name, id) \
_ClassDefInterp_(name,id,virtual,) \
static int DeclFileLine() { return __LINE__; }
#undef ClassDefNV
#define ClassDefNV(name, id) \
_ClassDefInterp_(name,id,,) \
static int DeclFileLine() { return __LINE__; }
#undef ClassDefOverride
#define ClassDefOverride(name, id) \
_ClassDefInterp_(name,id,,override) \
static int DeclFileLine() { return __LINE__; }
)ICF";
 
  static const std::string gNonInterpreterClassDef = R"ICF(
#define __ROOTCLING__ 1
#undef ClassDef
#define ClassDef(name,id) \
_ClassDefOutline_(name,id,virtual,) \
static int DeclFileLine() { return __LINE__; }
#undef ClassDefNV
#define ClassDefNV(name, id)\
_ClassDefOutline_(name,id,,)\
static int DeclFileLine() { return __LINE__; }
#undef ClassDefOverride
#define ClassDefOverride(name, id)\
_ClassDefOutline_(name,id,,override)\
static int DeclFileLine() { return __LINE__; }
)ICF";
 
// The macros below use ::Error, so let's ensure it is included
  static const std::string gClassDefInterpMacro = R"ICF(
#include "TError.h"
 
#define _ClassDefInterp_(name,id,virtual_keyword, overrd) \
private: \
public: \
   static TClass *Class() { static TClass* sIsA = 0; if (!sIsA) sIsA = TClass::GetClass(#name); return sIsA; } \
   static const char *Class_Name() { return #name; } \
   virtual_keyword Bool_t CheckTObjectHashConsistency() const overrd { return true; } \
   static Version_t Class_Version() { return id; } \
   static TClass *Dictionary() { return 0; } \
   virtual_keyword TClass *IsA() const overrd { return name::Class(); } \
   virtual_keyword void ShowMembers(TMemberInspector&insp) const overrd { ::ROOT::Class_ShowMembers(name::Class(), this, insp); } \
   virtual_keyword void Streamer(TBuffer&) overrd { ::Error("Streamer", "Cannot stream interpreted class."); } \
   void StreamerNVirtual(TBuffer&ClassDef_StreamerNVirtual_b) { name::Streamer(ClassDef_StreamerNVirtual_b); } \
   static const char *DeclFileName() { return __FILE__; } \
   static int ImplFileLine() { return 0; } \
   static const char *ImplFileName() { return __FILE__; }
)ICF";
}
R__EXTERN int optind;
 
// The functions are used to bridge cling/clang/llvm compiled with no-rtti and
// ROOT (which uses rtti)
 
////////////////////////////////////////////////////////////////////////////////
/// Print a StackTrace!
 
extern "C"
void TCling__PrintStackTrace() {
   gSystem->StackTrace();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Re-apply the lock count delta that TCling__ResetInterpreterMutex() caused.
 
extern "C" void TCling__RestoreInterpreterMutex(void *delta)
{
   ((TCling*)gCling)->ApplyToInterpreterMutex(delta);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Lookup libraries in LD_LIBRARY_PATH and DYLD_LIBRARY_PATH with mangled_name,
/// which is extracted by error messages we get from callback from cling. Return true
/// when the missing library was autoloaded.
 
extern "C" bool TCling__LibraryLoadingFailed(const std::string& errmessage, const std::string& libStem, bool permanent, bool resolved)
{
   return ((TCling*)gCling)->LibraryLoadingFailed(errmessage, libStem, permanent, resolved);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Reset the interpreter lock to the state it had before interpreter-related
/// calls happened.
 
extern "C" void *TCling__ResetInterpreterMutex()
{
   return ((TCling*)gCling)->RewindInterpreterMutex();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Lock the interpreter.
 
extern "C" void *TCling__LockCompilationDuringUserCodeExecution()
{
   if (gInterpreterMutex) {
      gInterpreterMutex->Lock();
   }
   return nullptr;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Unlock the interpreter.
 
extern "C" void TCling__UnlockCompilationDuringUserCodeExecution(void* /*state*/)
{
   if (gInterpreterMutex) {
      gInterpreterMutex->UnLock();
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Update TClingClassInfo for a class (e.g. upon seeing a definition).
 
static void TCling__UpdateClassInfo(const NamedDecl* TD)
{
   static Bool_t entered = kFALSE;
   static vector<const NamedDecl*> updateList;
   Bool_t topLevel;
 
   if (entered) topLevel = kFALSE;
   else {
      entered = kTRUE;
      topLevel = kTRUE;
   }
   if (topLevel) {
      ((TCling*)gInterpreter)->UpdateClassInfoWithDecl(TD);
   } else {
      // If we are called indirectly from within another call to
      // TCling::UpdateClassInfo, we delay the update until the dictionary loading
      // is finished (i.e. when we return to the top level TCling::UpdateClassInfo).
      // This allows for the dictionary to be fully populated when we actually
      // update the TClass object.   The updating of the TClass sometimes
      // (STL containers and when there is an emulated class) forces the building
      // of the TClass object's real data (which needs the dictionary info).
      updateList.push_back(TD);
   }
   if (topLevel) {
      while (!updateList.empty()) {
         ((TCling*)gInterpreter)->UpdateClassInfoWithDecl(updateList.back());
         updateList.pop_back();
      }
      entered = kFALSE;
   }
}
 
void TCling::UpdateEnumConstants(TEnum* enumObj, TClass* cl) const {
   const clang::Decl* D = static_cast<const clang::Decl*>(enumObj->GetDeclId());
   if(const clang::EnumDecl* ED = dyn_cast<clang::EnumDecl>(D)) {
      // Add the constants to the enum type.
      for (EnumDecl::enumerator_iterator EDI = ED->enumerator_begin(),
                EDE = ED->enumerator_end(); EDI != EDE; ++EDI) {
         // Get name of the enum type.
         std::string constbuf;
         if (const NamedDecl* END = llvm::dyn_cast<NamedDecl>(*EDI)) {
            PrintingPolicy Policy((*EDI)->getASTContext().getPrintingPolicy());
            llvm::raw_string_ostream stream(constbuf);
            // Don't trigger fopen of the source file to count lines:
            Policy.AnonymousTagLocations = false;
            (END)->getNameForDiagnostic(stream, Policy, /*Qualified=*/false);
         }
         const char* constantName = constbuf.c_str();
 
         // Get value of the constant.
         Long64_t value;
         const llvm::APSInt valAPSInt = (*EDI)->getInitVal();
         if (valAPSInt.isSigned()) {
            value = valAPSInt.getSExtValue();
         } else {
            value = valAPSInt.getZExtValue();
         }
 
         // Create the TEnumConstant or update it if existing
         TEnumConstant* enumConstant = nullptr;
         TClingClassInfo* tcCInfo = (TClingClassInfo*)(cl ? cl->GetClassInfo() : 0);
         TClingDataMemberInfo* tcDmInfo = new TClingDataMemberInfo(GetInterpreterImpl(), *EDI, tcCInfo);
         DataMemberInfo_t* dmInfo = (DataMemberInfo_t*) tcDmInfo;
         if (TObject* encAsTObj = enumObj->GetConstants()->FindObject(constantName)){
            ((TEnumConstant*)encAsTObj)->Update(dmInfo);
         } else {
            enumConstant = new TEnumConstant(dmInfo, constantName, value, enumObj);
         }
 
         // Add the global constants to the list of Globals.
         if (!cl) {
            TCollection* globals = gROOT->GetListOfGlobals(false);
            if (!globals->FindObject(constantName)) {
               globals->Add(enumConstant);
            }
         }
      }
   }
}
 
TEnum* TCling::CreateEnum(void *VD, TClass *cl) const
{
   // Handle new enum declaration for either global and nested enums.
 
   // Create the enum type.
   TEnum* enumType = 0;
   const clang::Decl* D = static_cast<const clang::Decl*>(VD);
   std::string buf;
   if (const EnumDecl* ED = llvm::dyn_cast<EnumDecl>(D)) {
      // Get name of the enum type.
      PrintingPolicy Policy(ED->getASTContext().getPrintingPolicy());
      llvm::raw_string_ostream stream(buf);
      // Don't trigger fopen of the source file to count lines:
      Policy.AnonymousTagLocations = false;
      ED->getNameForDiagnostic(stream, Policy, /*Qualified=*/false);
      // If the enum is unnamed we do not add it to the list of enums i.e unusable.
   }
   if (buf.empty()) {
      return 0;
   }
   const char* name = buf.c_str();
   enumType = new TEnum(name, VD, cl);
   UpdateEnumConstants(enumType, cl);
 
   return enumType;
}
 
void TCling::HandleNewDecl(const void* DV, bool isDeserialized, std::set<TClass*> &modifiedTClasses) {
   // Handle new declaration.
   // Record the modified class, struct and namespaces in 'modifiedTClasses'.
 
   const clang::Decl* D = static_cast<const clang::Decl*>(DV);
 
   if (!D->isCanonicalDecl() && !isa<clang::NamespaceDecl>(D)
       && !dyn_cast<clang::RecordDecl>(D)) return;
 
   if (isa<clang::FunctionDecl>(D->getDeclContext())
       || isa<clang::TagDecl>(D->getDeclContext()))
      return;
 
   // Don't list templates.
   if (const clang::CXXRecordDecl* RD = dyn_cast<clang::CXXRecordDecl>(D)) {
      if (RD->getDescribedClassTemplate())
         return;
   } else if (const clang::FunctionDecl* FD = dyn_cast<clang::FunctionDecl>(D)) {
      if (FD->getDescribedFunctionTemplate())
         return;
   }
 
   if (const RecordDecl *TD = dyn_cast<RecordDecl>(D)) {
      if (TD->isCanonicalDecl() || TD->isThisDeclarationADefinition())
         TCling__UpdateClassInfo(TD);
   }
   else if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) {
 
      if (const TagDecl *TD = dyn_cast<TagDecl>(D)) {
         // Mostly just for EnumDecl (the other TagDecl are handled
         // by the 'RecordDecl' if statement.
         TCling__UpdateClassInfo(TD);
      } else if (const NamespaceDecl* NSD = dyn_cast<NamespaceDecl>(D)) {
         TCling__UpdateClassInfo(NSD);
      }
 
      // We care about declarations on the global scope.
      if (!isa<TranslationUnitDecl>(ND->getDeclContext()))
         return;
 
      // Enums are lazyly created, thus we don not need to handle them here.
      if (isa<EnumDecl>(ND))
         return;
 
      // ROOT says that global is enum(lazylycreated)/var/field declared on the global
      // scope.
      if (!(isa<VarDecl>(ND)))
         return;
 
      // Skip if already in the list.
      if (gROOT->GetListOfGlobals()->FindObject(ND->getNameAsString().c_str()))
         return;
 
      // Put the global constants and global enums in the corresponding lists.
      gROOT->GetListOfGlobals()->Add(new TGlobal((DataMemberInfo_t *)
                                                 new TClingDataMemberInfo(GetInterpreterImpl(),
                                                                          cast<ValueDecl>(ND), 0)));
   }
}
 
extern "C"
void TCling__GetNormalizedContext(const ROOT::TMetaUtils::TNormalizedCtxt*& normCtxt)
{
   // We are sure in this context of the type of the interpreter
   normCtxt = &( (TCling*) gInterpreter)->GetNormalizedContext();
}
 
extern "C"
void TCling__UpdateListsOnCommitted(const cling::Transaction &T, cling::Interpreter*) {
   ((TCling*)gCling)->UpdateListsOnCommitted(T);
}
 
extern "C"
void TCling__UpdateListsOnUnloaded(const cling::Transaction &T) {
   ((TCling*)gCling)->UpdateListsOnUnloaded(T);
}
 
extern "C"
void TCling__InvalidateGlobal(const clang::Decl *D) {
   ((TCling*)gCling)->InvalidateGlobal(D);
}
 
extern "C"
void TCling__TransactionRollback(const cling::Transaction &T) {
   ((TCling*)gCling)->TransactionRollback(T);
}
 
extern "C" void TCling__LibraryLoadedRTTI(const void* dyLibHandle,
                                          const char* canonicalName) {
   ((TCling*)gCling)->LibraryLoaded(dyLibHandle, canonicalName);
}
 
extern "C" void TCling__RegisterRdictForLoadPCM(const std::string &pcmFileNameFullPath, llvm::StringRef *pcmContent)
{
   ((TCling *)gCling)->RegisterRdictForLoadPCM(pcmFileNameFullPath, pcmContent);
}
 
extern "C" void TCling__LibraryUnloadedRTTI(const void* dyLibHandle,
                                            const char* canonicalName) {
   ((TCling*)gCling)->LibraryUnloaded(dyLibHandle, canonicalName);
}
 
 
extern "C"
TObject* TCling__GetObjectAddress(const char *Name, void *&LookupCtx) {
   return ((TCling*)gCling)->GetObjectAddress(Name, LookupCtx);
}
 
extern "C" const Decl* TCling__GetObjectDecl(TObject *obj) {
   return ((TClingClassInfo*)obj->IsA()->GetClassInfo())->GetDecl();
}
 
extern "C" R__DLLEXPORT TInterpreter *CreateInterpreter(void* interpLibHandle,
                                                        const char* argv[])
{
   cling::DynamicLibraryManager::ExposeHiddenSharedLibrarySymbols(interpLibHandle);
   return new TCling("C++", "cling C++ Interpreter", argv);
}
 
extern "C" R__DLLEXPORT void DestroyInterpreter(TInterpreter *interp)
{
   delete interp;
}
 
// Load library containing specified class. Returns 0 in case of error
// and 1 in case if success.
extern "C" int TCling__AutoLoadCallback(const char* className)
{
   return ((TCling*)gCling)->AutoLoad(className);
}
 
extern "C" int TCling__AutoParseCallback(const char* className)
{
   return ((TCling*)gCling)->AutoParse(className);
}
 
extern "C" const char* TCling__GetClassSharedLibs(const char* className)
{
   return ((TCling*)gCling)->GetClassSharedLibs(className);
}
 
// Returns 0 for failure 1 for success
extern "C" int TCling__IsAutoLoadNamespaceCandidate(const clang::NamespaceDecl* nsDecl)
{
   return ((TCling*)gCling)->IsAutoLoadNamespaceCandidate(nsDecl);
}
 
extern "C" int TCling__CompileMacro(const char *fileName, const char *options)
{
   string file(fileName);
   string opt(options);
   return gSystem->CompileMacro(file.c_str(), opt.c_str());
}
 
extern "C" void TCling__SplitAclicMode(const char* fileName, string &mode,
                                       string &args, string &io, string &fname)
{
   string file(fileName);
   TString f, amode, arguments, aclicio;
   f = gSystem->SplitAclicMode(file.c_str(), amode, arguments, aclicio);
   mode = amode.Data(); args = arguments.Data();
   io = aclicio.Data(); fname = f.Data();
}
 
//______________________________________________________________________________
//
//
//
 
#ifdef R__WIN32
extern "C" {
   char *__unDName(char *demangled, const char *mangled, int out_len,
                   void * (* pAlloc )(size_t), void (* pFree )(void *),
                   unsigned short int flags);
}
#endif
 
////////////////////////////////////////////////////////////////////////////////
/// Find a template decl within N nested namespaces, 0<=N<inf
/// Assumes 1 and only 1 template present and 1 and only 1 entity contained
/// by the namespace. Example: ns1::ns2::..::nsN::myTemplate
/// Returns nullptr in case of error
 
static clang::ClassTemplateDecl* FindTemplateInNamespace(clang::Decl* decl)
{
   using namespace clang;
   if (NamespaceDecl* nsd = llvm::dyn_cast<NamespaceDecl>(decl)){
      return FindTemplateInNamespace(*nsd->decls_begin());
   }
 
   if (ClassTemplateDecl* ctd = llvm::dyn_cast<ClassTemplateDecl>(decl)){
      return ctd;
   }
 
   return nullptr; // something went wrong.
}
 
////////////////////////////////////////////////////////////////////////////////
/// Autoload a library provided the mangled name of a missing symbol.
 
void* llvmLazyFunctionCreator(const std::string& mangled_name)
{
   return ((TCling*)gCling)->LazyFunctionCreatorAutoload(mangled_name);
}
 
//______________________________________________________________________________
//
//
//
 
int TCling_GenerateDictionary(const std::vector<std::string> &classes,
                              const std::vector<std::string> &headers,
                              const std::vector<std::string> &fwdDecls,
                              const std::vector<std::string> &unknown)
{
   //This function automatically creates the "LinkDef.h" file for templated
   //classes then executes CompileMacro on it.
   //The name of the file depends on the class name, and it's not generated again
   //if the file exist.
   if (classes.empty()) {
      return 0;
   }
   // Use the name of the first class as the main name.
   const std::string& className = classes[0];
   //(0) prepare file name
   TString fileName = "AutoDict_";
   std::string::const_iterator sIt;
   for (sIt = className.begin(); sIt != className.end(); ++sIt) {
      if (*sIt == '<' || *sIt == '>' ||
            *sIt == ' ' || *sIt == '*' ||
            *sIt == ',' || *sIt == '&' ||
            *sIt == ':') {
         fileName += '_';
      }
      else {
         fileName += *sIt;
      }
   }
   if (classes.size() > 1) {
      Int_t chk = 0;
      std::vector<std::string>::const_iterator it = classes.begin();
      while ((++it) != classes.end()) {
         for (UInt_t cursor = 0; cursor != it->length(); ++cursor) {
            chk = chk * 3 + it->at(cursor);
         }
      }
      fileName += TString::Format("_%u", chk);
   }
   fileName += ".cxx";
   if (gSystem->AccessPathName(fileName) != 0) {
      //file does not exist
      //(1) prepare file data
      // If STL, also request iterators' operators.
      // vector is special: we need to check whether
      // vector::iterator is a typedef to pointer or a
      // class.
      static const std::set<std::string> sSTLTypes {
         "vector","list","forward_list","deque","map","unordered_map","multimap",
         "unordered_multimap","set","unordered_set","multiset","unordered_multiset",
         "queue","priority_queue","stack","iterator"};
      std::vector<std::string>::const_iterator it;
      std::string fileContent("");
      for (it = headers.begin(); it != headers.end(); ++it) {
         fileContent += "#include \"" + *it + "\"\n";
      }
      for (it = unknown.begin(); it != unknown.end(); ++it) {
         TClass* cl = TClass::GetClass(it->c_str());
         if (cl && cl->GetDeclFileName()) {
            TString header = gSystem->BaseName(cl->GetDeclFileName());
            TString dir = gSystem->GetDirName(cl->GetDeclFileName());
            TString dirbase(gSystem->BaseName(dir));
            while (dirbase.Length() && dirbase != "."
                   && dirbase != "include" && dirbase != "inc"
                   && dirbase != "prec_stl") {
               gSystem->PrependPathName(dirbase, header);
               dir = gSystem->GetDirName(dir);
            }
            fileContent += TString("#include \"") + header + "\"\n";
         }
      }
      for (it = fwdDecls.begin(); it != fwdDecls.end(); ++it) {
         fileContent += "class " + *it + ";\n";
      }
      fileContent += "#ifdef __CINT__ \n";
      fileContent += "#pragma link C++ nestedclasses;\n";
      fileContent += "#pragma link C++ nestedtypedefs;\n";
      for (it = classes.begin(); it != classes.end(); ++it) {
         std::string n(*it);
         size_t posTemplate = n.find('<');
         std::set<std::string>::const_iterator iSTLType = sSTLTypes.end();
         if (posTemplate != std::string::npos) {
            n.erase(posTemplate, std::string::npos);
            if (n.compare(0, 5, "std::") == 0) {
               n.erase(0, 5);
            }
            iSTLType = sSTLTypes.find(n);
         }
         fileContent += "#pragma link C++ class ";
         fileContent +=    *it + "+;\n" ;
         fileContent += "#pragma link C++ class ";
         if (iSTLType != sSTLTypes.end()) {
            // STL class; we cannot (and don't need to) store iterators;
            // their shadow and the compiler's version don't agree. So
            // don't ask for the '+'
            fileContent +=    *it + "::*;\n" ;
         }
         else {
            // Not an STL class; we need to allow the I/O of contained
            // classes (now that we have a dictionary for them).
            fileContent +=    *it + "::*+;\n" ;
         }
      }
      fileContent += "#endif\n";
      //end(1)
      //(2) prepare the file
      FILE* filePointer;
      filePointer = fopen(fileName, "w");
      if (filePointer == NULL) {
         //can't open a file
         return 1;
      }
      //end(2)
      //write data into the file
      fprintf(filePointer, "%s", fileContent.c_str());
      fclose(filePointer);
   }
   //(3) checking if we can compile a macro, if not then cleaning
   Int_t oldErrorIgnoreLevel = gErrorIgnoreLevel;
   gErrorIgnoreLevel = kWarning; // no "Info: creating library..."
   Int_t ret = gSystem->CompileMacro(fileName, "k");
   gErrorIgnoreLevel = oldErrorIgnoreLevel;
   if (ret == 0) { //can't compile a macro
      return 2;
   }
   //end(3)
   return 0;
}
 
int TCling_GenerateDictionary(const std::string& className,
                              const std::vector<std::string> &headers,
                              const std::vector<std::string> &fwdDecls,
                              const std::vector<std::string> &unknown)
{
   //This function automatically creates the "LinkDef.h" file for templated
   //classes then executes CompileMacro on it.
   //The name of the file depends on the class name, and it's not generated again
   //if the file exist.
   std::vector<std::string> classes;
   classes.push_back(className);
   return TCling_GenerateDictionary(classes, headers, fwdDecls, unknown);
}
 
//______________________________________________________________________________
//
//
//
 
// It is a "fantom" method to synchronize user keyboard input
// and ROOT prompt line (for WIN32)
const char* fantomline = "TRint::EndOfLineAction();";
 
//______________________________________________________________________________
//
//
//
 
void* TCling::fgSetOfSpecials = 0;
 
//______________________________________________________________________________
//
// llvm error handler through exceptions; see also cling/UserInterface
//
namespace {
   // Handle fatal llvm errors by throwing an exception.
   // Yes, throwing exceptions in error handlers is bad.
   // Doing nothing is pretty terrible, too.
   void exceptionErrorHandler(void * /*user_data*/,
                              const std::string& reason,
                              bool /*gen_crash_diag*/) {
      throw std::runtime_error(std::string(">>> Interpreter compilation error:\n") + reason);
   }
}
 
//______________________________________________________________________________
//
//
//
 
////////////////////////////////////////////////////////////////////////////////
 
namespace{
   // An instance of this class causes the diagnostics of clang to be suppressed
   // during its lifetime
   class clangDiagSuppr {
   public:
      clangDiagSuppr(clang::DiagnosticsEngine& diag): fDiagEngine(diag){
         fOldDiagValue = fDiagEngine.getIgnoreAllWarnings();
         fDiagEngine.setIgnoreAllWarnings(true);
      }
 
      ~~clangDiagSuppr() {
         fDiagEngine.setIgnoreAllWarnings(fOldDiagValue);
      }
   private:
      clang::DiagnosticsEngine& fDiagEngine;
      bool fOldDiagValue;
   };
 
}
 
////////////////////////////////////////////////////////////////////////////////
/// Allow calling autoparsing from TMetaUtils
bool TClingLookupHelper__AutoParse(const char *cname)
{
   return gCling->AutoParse(cname);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Try hard to avoid looking up in the Cling database as this could enduce
/// an unwanted autoparsing.
 
bool TClingLookupHelper__ExistingTypeCheck(const std::string &tname,
                                           std::string &result)
{
   result.clear();
 
   unsigned long offset = 0;
   if (strncmp(tname.c_str(), "const ", 6) == 0) {
      offset = 6;
   }
   unsigned long end = tname.length();
   while( end && (tname[end-1]=='&' || tname[end-1]=='*' || tname[end-1]==']') ) {
      if ( tname[end-1]==']' ) {
         --end;
         while ( end && tname[end-1]!='[' ) --end;
      }
      --end;
   }
   std::string innerbuf;
   const char *inner;
   if (end != tname.length()) {
      innerbuf = tname.substr(offset,end-offset);
      inner = innerbuf.c_str();
   } else {
      inner = tname.c_str()+offset;
   }
 
   //if (strchr(tname.c_str(),'[')!=0) fprintf(stderr,"DEBUG: checking on %s vs %s %lu %lu\n",tname.c_str(),inner,offset,end);
   if (gROOT->GetListOfClasses()->FindObject(inner)
       || TClassTable::Check(inner,result) ) {
      // This is a known class.
      return true;
   }
 
   THashTable *typeTable = dynamic_cast<THashTable*>( gROOT->GetListOfTypes() );
   TDataType *type = (TDataType *)typeTable->THashTable::FindObject( inner );
   if (type) {
      // This is a raw type and an already loaded typedef.
      const char *newname = type->GetFullTypeName();
      if (type->GetType() == kLong64_t) {
         newname = "Long64_t";
      } else if (type->GetType() == kULong64_t) {
         newname = "ULong64_t";
      }
      if (strcmp(inner,newname) == 0) {
         return true;
      }
      if (offset) result = "const ";
      result += newname;
      if ( end != tname.length() ) {
         result += tname.substr(end,tname.length()-end);
      }
      if (result == tname) result.clear();
      return true;
   }
 
   // Check if the name is an enumerator
   const auto lastPos = TClassEdit::GetUnqualifiedName(inner);
   if (lastPos != inner)   // Main switch: case 1 - scoped enum, case 2 global enum
   {
      // We have a scope
      // All of this C gymnastic is to avoid allocations on the heap
      const auto enName = lastPos;
      const auto scopeNameSize = ((Long64_t)lastPos - (Long64_t)inner) / sizeof(decltype(*lastPos)) - 2;
      char *scopeName = new char[scopeNameSize + 1];
      strncpy(scopeName, inner, scopeNameSize);
      scopeName[scopeNameSize] = '\0';
      // Check if the scope is in the list of classes
      if (auto scope = static_cast<TClass *>(gROOT->GetListOfClasses()->FindObject(scopeName))) {
         auto enumTable = dynamic_cast<const THashList *>(scope->GetListOfEnums(false));
         if (enumTable && enumTable->THashList::FindObject(enName)) { delete [] scopeName; return true; }
      }
      // It may still be in one of the loaded protoclasses
      else if (auto scope = static_cast<TProtoClass *>(gClassTable->GetProtoNorm(scopeName))) {
         auto listOfEnums = scope->GetListOfEnums();
         if (listOfEnums) { // it could be null: no enumerators in the protoclass
            auto enumTable = dynamic_cast<const THashList *>(listOfEnums);
            if (enumTable && enumTable->THashList::FindObject(enName)) { delete [] scopeName; return true; }
         }
      }
      delete [] scopeName;
   } else
   {
      // We don't have any scope: this could only be a global enum
      auto enumTable = dynamic_cast<const THashList *>(gROOT->GetListOfEnums());
      if (enumTable && enumTable->THashList::FindObject(inner)) return true;
   }
 
   if (gCling->GetClassSharedLibs(inner))
   {
      // This is a class name.
      return true;
   }
 
   return false;
}
 
////////////////////////////////////////////////////////////////////////////////
 
TCling::TUniqueString::TUniqueString(Long64_t size)
{
   fContent.reserve(size);
}
 
////////////////////////////////////////////////////////////////////////////////
 
inline const char *TCling::TUniqueString::Data()
{
   return fContent.c_str();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Append string to the storage if not added already.
 
inline bool TCling::TUniqueString::Append(const std::string& str)
{
   bool notPresent = fLinesHashSet.emplace(fHashFunc(str)).second;
   if (notPresent){
      fContent+=str;
   }
   return notPresent;
}
 
std::string TCling::ToString(const char* type, void* obj)
{
   return fInterpreter->toString(type, obj);
}
 
////////////////////////////////////////////////////////////////////////////////
///\returns true if the module was loaded.
static bool LoadModule(const std::string &ModuleName, cling::Interpreter &interp)
{
   // When starting up ROOT, cling would load all modulemap files on the include
   // paths. However, in a ROOT session, it is very common to run aclic which
   // will invoke rootcling and possibly produce a modulemap and a module in
   // the current folder.
   //
   // Before failing, try loading the modulemap in the current folder and try
   // loading the requested module from it.
   std::string currentDir = gSystem->WorkingDirectory();
   assert(!currentDir.empty());
   gCling->RegisterPrebuiltModulePath(currentDir);
   if (gDebug > 2)
      ::Info("TCling::__LoadModule", "Preloading module %s. \n",
             ModuleName.c_str());
 
   return interp.loadModule(ModuleName, /*Complain=*/true);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Loads the C++ modules that we require to run any ROOT program. This is just
/// supposed to make a C++ module from a modulemap available to the interpreter.
static void LoadModules(const std::vector<std::string> &modules, cling::Interpreter &interp)
{
   for (const auto &modName : modules)
      LoadModule(modName, interp);
}
 
static bool IsFromRootCling() {
  // rootcling also uses TCling for generating the dictionary ROOT files.
  const static bool foundSymbol = dlsym(RTLD_DEFAULT, "usedToIdentifyRootClingByDlSym");
  return foundSymbol;
}
 
/// Checks if there is an ASTFile on disk for the given module \c M.
static bool HasASTFileOnDisk(clang::Module *M, const clang::Preprocessor &PP, std::string *FullFileName = nullptr)
{
   const HeaderSearchOptions &HSOpts = PP.getHeaderSearchInfo().getHeaderSearchOpts();
 
   std::string ModuleFileName;
   if (!HSOpts.PrebuiltModulePaths.empty())
      // Load the module from *only* in the prebuilt module path.
      ModuleFileName = PP.getHeaderSearchInfo().getModuleFileName(M->Name, /*ModuleMapPath*/"", /*UsePrebuiltPath*/ true);
   if (FullFileName)
      *FullFileName = ModuleFileName;
 
   return !ModuleFileName.empty();
}
 
static bool HaveFullGlobalModuleIndex = false;
static GlobalModuleIndex *loadGlobalModuleIndex(SourceLocation TriggerLoc, cling::Interpreter &interp)
{
   CompilerInstance &CI = *interp.getCI();
   Preprocessor &PP = CI.getPreprocessor();
   auto ModuleManager = CI.getModuleManager();
   assert(ModuleManager);
   // StringRef ModuleIndexPath = HSI.getModuleCachePath();
   // HeaderSearch& HSI = PP.getHeaderSearchInfo();
   // HSI.setModuleCachePath(TROOT::GetLibDir().Data());
   std::string ModuleIndexPath = TROOT::GetLibDir().Data();
   if (ModuleIndexPath.empty())
      return nullptr;
   // Get an existing global index. This loads it if not already loaded.
   ModuleManager->resetForReload();
   ModuleManager->loadGlobalIndex();
   GlobalModuleIndex *GlobalIndex = ModuleManager->getGlobalIndex();
 
   // For finding modules needing to be imported for fixit messages,
   // we need to make the global index cover all modules, so we do that here.
   if (!GlobalIndex && !HaveFullGlobalModuleIndex) {
      ModuleMap &MMap = PP.getHeaderSearchInfo().getModuleMap();
      bool RecreateIndex = false;
      for (ModuleMap::module_iterator I = MMap.module_begin(), E = MMap.module_end(); I != E; ++I) {
         Module *TheModule = I->second;
         // We want the index only of the prebuilt modules.
         if (!HasASTFileOnDisk(TheModule, PP))
            continue;
         LoadModule(TheModule->Name, interp);
         RecreateIndex = true;
      }
      if (RecreateIndex) {
         GlobalModuleIndex::writeIndex(CI.getFileManager(), CI.getPCHContainerReader(), ModuleIndexPath);
         ModuleManager->resetForReload();
         ModuleManager->loadGlobalIndex();
         GlobalIndex = ModuleManager->getGlobalIndex();
      }
      HaveFullGlobalModuleIndex = true;
   }
   return GlobalIndex;
}
 
static void RegisterCxxModules(cling::Interpreter &clingInterp)
{
   if (!clingInterp.getCI()->getLangOpts().Modules)
      return;
      // Setup core C++ modules if we have any to setup.
 
      // Load libc and stl first.
      // Load vcruntime module for windows
#ifdef R__WIN32
   LoadModule("vcruntime", clingInterp);
#endif
 
#ifdef R__MACOSX
   LoadModule("Darwin", clingInterp);
#else
   LoadModule("libc", clingInterp);
#endif
   LoadModule("std", clingInterp);
 
   LoadModule("_Builtin_intrinsics", clingInterp);
 
   // Load core modules
   // This should be vector in order to be able to pass it to LoadModules
   std::vector<std::string> CoreModules = {"ROOT_Foundation_C",
                                           "ROOT_Config",
                                           "ROOT_Rtypes",
                                           "ROOT_Foundation_Stage1_NoRTTI",
                                           "Core",
                                           "RIO"};
 
   LoadModules(CoreModules, clingInterp);
 
   // FIXME: Reducing those will let us be less dependent on rootmap files
   static constexpr std::array<const char *, 3> ExcludeModules = {
      {"Rtools", "RSQLite", "RInterface"}};
 
   // Take this branch only from ROOT because we don't need to preload modules in rootcling
   if (!IsFromRootCling()) {
      std::vector<std::string> CommonModules = {"MathCore"};
      LoadModules(CommonModules, clingInterp);
 
      // These modules should not be preloaded but they fix issues.
      std::vector<std::string> FIXMEModules = {"Hist", "Gpad", "Graf",
                                               "GenVector", "Smatrix", "Tree",
                                               "TreePlayer", "Physics",
                                               "Proof", "Geom"};
      LoadModules(FIXMEModules, clingInterp);
 
      clang::CompilerInstance &CI = *clingInterp.getCI();
      GlobalModuleIndex *GlobalIndex = nullptr;
      const char *experimentalGMI = gSystem->Getenv("ROOT_EXPERIMENTAL_GMI");
      if (experimentalGMI && strcmp(experimentalGMI,"false") != 0) {
         loadGlobalModuleIndex(SourceLocation(), clingInterp);
         GlobalIndex = CI.getModuleManager()->getGlobalIndex();
      }
      llvm::StringSet<> KnownModuleFileNames;
      if (GlobalIndex)
         GlobalIndex->getKnownModuleFileNames(KnownModuleFileNames);
 
      clang::Preprocessor &PP = CI.getPreprocessor();
      std::vector<std::string> PendingModules;
      PendingModules.reserve(256);
      ModuleMap &MMap = PP.getHeaderSearchInfo().getModuleMap();
      for (auto I = MMap.module_begin(), E = MMap.module_end(); I != E; ++I) {
         clang::Module *M = I->second;
         assert(M);
 
         // We want to load only already created modules.
         std::string FullASTFilePath;
         if (!HasASTFileOnDisk(M, PP, &FullASTFilePath))
            continue;
 
         if (GlobalIndex && KnownModuleFileNames.count(FullASTFilePath))
            continue;
 
         if (M->IsMissingRequirement)
            continue;
 
         if (GlobalIndex)
            LoadModule(M->Name, clingInterp);
         else {
            // FIXME: We may be able to remove those checks as cling::loadModule
            // checks if a module was alredy loaded.
            if (std::find(CoreModules.begin(), CoreModules.end(), M->Name) != CoreModules.end())
               continue; // This is a core module which was already loaded.
 
            if (std::find(ExcludeModules.begin(), ExcludeModules.end(), M->Name) != ExcludeModules.end())
               continue;
 
            // Load system modules now and delay the other modules after we have
            // loaded all system ones.
            if (M->IsSystem)
               LoadModule(M->Name, clingInterp);
            else
               PendingModules.push_back(M->Name);
         }
      }
      LoadModules(PendingModules, clingInterp);
   }
 
   // Check that the gROOT macro was exported by any core module.
   assert(clingInterp.getMacro("gROOT") && "Couldn't load gROOT macro?");
 
   // C99 decided that it's a very good idea to name a macro `I` (the letter I).
   // This seems to screw up nearly all the template code out there as `I` is
   // common template parameter name and iterator variable name.
   // Let's follow the GCC recommendation and undefine `I` in case any of the
   // core modules have defined it:
   // https://www.gnu.org/software/libc/manual/html_node/Complex-Numbers.html
   clingInterp.declare("#ifdef I\n #undef I\n #endif\n");
 
   // libc++ complex.h has #define complex _Complex. Give preference to the one
   // in std.
   clingInterp.declare("#ifdef complex\n #undef complex\n #endif\n");
 
   // These macros are from loading R related modules, which conflict with
   // user's code.
   clingInterp.declare("#ifdef PI\n #undef PI\n #endif\n");
   clingInterp.declare("#ifdef ERROR\n #undef ERROR\n #endif\n");
}
 
static void RegisterPreIncludedHeaders(cling::Interpreter &clingInterp)
{
   std::string PreIncludes;
   bool hasCxxModules = clingInterp.getCI()->getLangOpts().Modules;
 
   // For the list to also include string, we have to include it now.
   // rootcling does parts already if needed, e.g. genreflex does not want using
   // namespace std.
   if (IsFromRootCling()) {
      PreIncludes += "#include \"RtypesCore.h\"\n";
   } else {
      if (!hasCxxModules)
         PreIncludes += "#include \"Rtypes.h\"\n";
 
      PreIncludes += gClassDefInterpMacro + "\n"
                     + gInterpreterClassDef + "\n"
                     "#undef ClassImp\n"
                     "#define ClassImp(X);\n";
   }
   if (!hasCxxModules)
      PreIncludes += "#include <string>\n";
 
   // We must include it even when we have modules because it is marked as
   // textual in the modulemap due to the nature of the assert header.
#ifndef R__WIN32
   PreIncludes += "#include <cassert>\n";
#endif
   PreIncludes += "using namespace std;\n";
   clingInterp.declare(PreIncludes);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Initialize the cling interpreter interface.
/// \param argv - array of arguments passed to the cling::Interpreter constructor
///               e.g. `-DFOO=bar`. The last element of the array must be `nullptr`.
 
TCling::TCling(const char *name, const char *title, const char* const argv[])
: TInterpreter(name, title), fMore(0), fGlobalsListSerial(-1), fMapfile(nullptr),
  fRootmapFiles(nullptr), fLockProcessLine(true), fNormalizedCtxt(0),
  fPrevLoadedDynLibInfo(0), fClingCallbacks(0), fAutoLoadCallBack(0),
  fTransactionCount(0), fHeaderParsingOnDemand(true), fIsAutoParsingSuspended(kFALSE)
{
   fPrompt[0] = 0;
   const bool fromRootCling = IsFromRootCling();
 
   fCxxModulesEnabled = false;
#ifdef R__USE_CXXMODULES
   fCxxModulesEnabled = true;
#endif
 
   llvm::install_fatal_error_handler(&exceptionErrorHandler);
 
   fTemporaries = new std::vector<cling::Value>();
 
   std::vector<std::string> clingArgsStorage;
   clingArgsStorage.push_back("cling4root");
   for (const char* const* arg = argv; *arg; ++arg)
      clingArgsStorage.push_back(*arg);
 
   // rootcling sets its arguments through TROOT::GetExtraInterpreterArgs().
   if (!fromRootCling) {
      ROOT::TMetaUtils::SetPathsForRelocatability(clingArgsStorage);
 
      // Add -I early so ASTReader can find the headers.
      std::string interpInclude(TROOT::GetEtcDir().Data());
      clingArgsStorage.push_back("-I" + interpInclude);
 
      // Add include path to etc/cling.
      clingArgsStorage.push_back("-I" + interpInclude + "/cling");
 
      // Add the root include directory and etc/ to list searched by default.
      clingArgsStorage.push_back(std::string(("-I" + TROOT::GetIncludeDir()).Data()));
 
      // Add the current path to the include path
      // TCling::AddIncludePath(".");
 
      // Attach the PCH (unless we have C++ modules enabled which provide the
      // same functionality).
      if (!fCxxModulesEnabled) {
         std::string pchFilename = interpInclude + "/allDict.cxx.pch";
         if (gSystem->Getenv("ROOT_PCH")) {
            pchFilename = gSystem->Getenv("ROOT_PCH");
         }
 
         clingArgsStorage.push_back("-include-pch");
         clingArgsStorage.push_back(pchFilename);
      }
 
      clingArgsStorage.push_back("-Wno-undefined-inline");
      clingArgsStorage.push_back("-fsigned-char");
   }
 
   // Process externally passed arguments if present.
   llvm::Optional<std::string> EnvOpt = llvm::sys::Process::GetEnv("EXTRA_CLING_ARGS");
   if (EnvOpt.hasValue()) {
      StringRef Env(*EnvOpt);
      while (!Env.empty()) {
         StringRef Arg;
         std::tie(Arg, Env) = Env.split(' ');
         clingArgsStorage.push_back(Arg.str());
      }
   }
 
   auto GetEnvVarPath = [](const std::string &EnvVar,
                            std::vector<std::string> &Paths) {
      llvm::Optional<std::string> EnvOpt = llvm::sys::Process::GetEnv(EnvVar);
      if (EnvOpt.hasValue()) {
         StringRef Env(*EnvOpt);
         while (!Env.empty()) {
            StringRef Arg;
            std::tie(Arg, Env) = Env.split(ROOT::FoundationUtils::GetEnvPathSeparator());
            if (std::find(Paths.begin(), Paths.end(), Arg.str()) == Paths.end())
               Paths.push_back(Arg.str());
         }
      }
   };
 
   if (fCxxModulesEnabled) {
      std::vector<std::string> Paths;
      // ROOT usually knows better where its libraries are. This way we can
      // discover modules without having to should thisroot.sh and should fix
      // gnuinstall.
      Paths.push_back(TROOT::GetLibDir().Data());
      GetEnvVarPath("CLING_PREBUILT_MODULE_PATH", Paths);
      //GetEnvVarPath("LD_LIBRARY_PATH", Paths);
      std::string EnvVarPath;
      for (const std::string& P : Paths)
         EnvVarPath += P + ROOT::FoundationUtils::GetEnvPathSeparator();
      // FIXME: We should make cling -fprebuilt-module-path work.
      gSystem->Setenv("CLING_PREBUILT_MODULE_PATH", EnvVarPath.c_str());
   }
 
   // FIXME: This only will enable frontend timing reports.
   EnvOpt = llvm::sys::Process::GetEnv("ROOT_CLING_TIMING");
   if (EnvOpt.hasValue())
     clingArgsStorage.push_back("-ftime-report");
 
   // Add the overlay file. Note that we cannot factor it out for both root
   // and rootcling because rootcling activates modules only if -cxxmodule
   // flag is passed.
   if (fCxxModulesEnabled && !fromRootCling) {
      // For now we prefer rootcling to enumerate explicitly its modulemaps.
      std::vector<std::string> Paths;
      Paths.push_back(TROOT::GetIncludeDir().Data());
      GetEnvVarPath("CLING_MODULEMAP_PATH", Paths);
 
      // Give highest precedence of the modulemap in the cwd.
      Paths.push_back(gSystem->WorkingDirectory());
 
      for (const std::string& P : Paths) {
         std::string ModuleMapLoc = P + ROOT::FoundationUtils::GetPathSeparator()
            + "module.modulemap";
         if (!llvm::sys::fs::exists(ModuleMapLoc)) {
            if (gDebug > 1)
               ::Info("TCling::TCling", "Modulemap %s does not exist \n",
                      ModuleMapLoc.c_str());
 
            continue;
         }
 
         clingArgsStorage.push_back("-fmodule-map-file=" + ModuleMapLoc);
      }
      std::string ModulesCachePath;
      EnvOpt = llvm::sys::Process::GetEnv("CLING_MODULES_CACHE_PATH");
      if (EnvOpt.hasValue()){
         StringRef Env(*EnvOpt);
         assert(llvm::sys::fs::exists(Env) && "Path does not exist!");
         ModulesCachePath = Env.str();
      } else {
         ModulesCachePath = TROOT::GetLibDir();
      }
 
      clingArgsStorage.push_back("-fmodules-cache-path=" + ModulesCachePath);
   }
 
   std::vector<const char*> interpArgs;
   for (std::vector<std::string>::const_iterator iArg = clingArgsStorage.begin(),
           eArg = clingArgsStorage.end(); iArg != eArg; ++iArg)
      interpArgs.push_back(iArg->c_str());
 
   // Activate C++ modules support. If we are running within rootcling, it's up
   // to rootcling to set this flag depending on whether it wants to produce
   // C++ modules.
   TString vfsArg;
   if (fCxxModulesEnabled) {
      if (!fromRootCling) {
         // We only set this flag, rest is done by the CIFactory.
         interpArgs.push_back("-fmodules");
         interpArgs.push_back("-fno-implicit-module-maps");
         // We should never build modules during runtime, so let's enable the
         // module build remarks from clang to make it easier to spot when we do
         // this by accident.
         interpArgs.push_back("-Rmodule-build");
      }
      // ROOT implements its AutoLoading upon module's link directives. We
      // generate module A { header "A.h" link "A.so" export * } where ROOT's
      // facilities use the link directive to dynamically load the relevant
      // library. So, we need to suppress clang's default autolink behavior.
      interpArgs.push_back("-fno-autolink");
   }
 
#ifdef R__FAST_MATH
   // Same setting as in rootcling_impl.cxx.
   interpArgs.push_back("-ffast-math");
#endif
 
   TString llvmResourceDir = TROOT::GetEtcDir() + "/cling";
   // Add statically injected extra arguments, usually coming from rootcling.
   for (const char** extraArgs = TROOT::GetExtraInterpreterArgs();
        extraArgs && *extraArgs; ++extraArgs) {
      if (!strcmp(*extraArgs, "-resource-dir")) {
         // Take the next arg as the llvm resource directory.
         llvmResourceDir = *(++extraArgs);
      } else {
         interpArgs.push_back(*extraArgs);
      }
   }
 
   for (const auto &arg: TROOT::AddExtraInterpreterArgs({})) {
      interpArgs.push_back(arg.c_str());
   }
 
   // Add the Rdict module file extension.
   cling::Interpreter::ModuleFileExtensions extensions;
   EnvOpt = llvm::sys::Process::GetEnv("ROOTDEBUG_RDICT");
   if (!EnvOpt.hasValue())
      extensions.push_back(std::make_shared<TClingRdictModuleFileExtension>());
 
   fInterpreter = llvm::make_unique<cling::Interpreter>(interpArgs.size(),
                                                        &(interpArgs[0]),
                                                        llvmResourceDir, extensions);
 
   if (!fromRootCling) {
      fInterpreter->installLazyFunctionCreator(llvmLazyFunctionCreator);
   }
 
   // Don't check whether modules' files exist.
   fInterpreter->getCI()->getPreprocessorOpts().DisablePCHValidation = true;
 
   // Until we can disable AutoLoading during Sema::CorrectTypo() we have
   // to disable spell checking.
   fInterpreter->getCI()->getLangOpts().SpellChecking = false;
 
   // We need stream that doesn't close its file descriptor, thus we are not
   // using llvm::outs. Keeping file descriptor open we will be able to use
   // the results in pipes (Savannah #99234).
   static llvm::raw_fd_ostream fMPOuts (STDOUT_FILENO, /*ShouldClose*/false);
   fMetaProcessor = llvm::make_unique<cling::MetaProcessor>(*fInterpreter, fMPOuts);
 
   RegisterCxxModules(*fInterpreter);
   RegisterPreIncludedHeaders(*fInterpreter);
 
   // We are now ready (enough is loaded) to init the list of opaque typedefs.
   fNormalizedCtxt = new ROOT::TMetaUtils::TNormalizedCtxt(fInterpreter->getLookupHelper());
   fLookupHelper = new ROOT::TMetaUtils::TClingLookupHelper(*fInterpreter, *fNormalizedCtxt,
                                                            TClingLookupHelper__ExistingTypeCheck,
                                                            TClingLookupHelper__AutoParse,
                                                            &fIsShuttingDown);
   TClassEdit::Init(fLookupHelper);
 
   // Disallow auto-parsing in rootcling
   fIsAutoParsingSuspended = fromRootCling;
 
   ResetAll();
 
   // Enable dynamic lookup
   if (!fromRootCling) {
      fInterpreter->enableDynamicLookup();
   }
 
   // Enable ClinG's DefinitionShadower for ROOT.
   fInterpreter->allowRedefinition();
 
   // Attach cling callbacks last; they might need TROOT::fInterpreter
   // and should thus not be triggered during the equivalent of
   // TROOT::fInterpreter = new TCling;
   std::unique_ptr<TClingCallbacks>
      clingCallbacks(new TClingCallbacks(GetInterpreterImpl(), /*hasCodeGen*/ !fromRootCling));
   fClingCallbacks = clingCallbacks.get();
   fClingCallbacks->SetAutoParsingSuspended(fIsAutoParsingSuspended);
   fInterpreter->setCallbacks(std::move(clingCallbacks));
 
   if (!fromRootCling) {
      cling::DynamicLibraryManager& DLM = *fInterpreter->getDynamicLibraryManager();
      // Make sure cling looks into ROOT's libdir, even if not part of LD_LIBRARY_PATH
      // e.g. because of an RPATH build.
      DLM.addSearchPath(TROOT::GetLibDir().Data());
      auto ShouldPermanentlyIgnore = [](llvm::StringRef FileName) -> bool{
         llvm::StringRef stem = llvm::sys::path::stem(FileName);
         return stem.startswith("libNew") || stem.startswith("libcppyy_backend");
      };
      // Initialize the dyld for the llvmLazyFunctionCreator.
      DLM.initializeDyld(ShouldPermanentlyIgnore);
   }
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Destroy the interpreter interface.
 
TCling::~TCling()
{
   // ROOT's atexit functions require the interepreter to be available.
   // Run them before shutting down.
   if (!IsFromRootCling())
      GetInterpreterImpl()->runAtExitFuncs();
   fIsShuttingDown = true;
   delete fMapfile;
   delete fRootmapFiles;
   delete fTemporaries;
   delete fNormalizedCtxt;
   delete fLookupHelper;
   gCling = 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Initialize the interpreter, once TROOT::fInterpreter is set.
 
void TCling::Initialize()
{
   fClingCallbacks->Initialize();
 
   // We are set up. Enable ROOT's AutoLoading.
   if (IsFromRootCling())
      return;
 
   // Read the rules before enabling the auto loading to not inadvertently
   // load the libraries for the classes concerned even-though the user is
   // *not* using them.
   // Note this call must happen before the first call to LoadLibraryMap.
   assert(GetRootMapFiles() == 0 && "Must be called before LoadLibraryMap!");
   TClass::ReadRules(); // Read the default customization rules ...
 
   LoadLibraryMap();
   SetClassAutoLoading(true);
}
 
void TCling::ShutDown()
{
   fIsShuttingDown = true;
   ResetGlobals();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Helper to initialize TVirtualStreamerInfo's factor early.
/// Use static initialization to insure only one TStreamerInfo is created.
static bool R__InitStreamerInfoFactory()
{
   // Use lambda since SetFactory return void.
   auto setFactory = []() {
      TVirtualStreamerInfo::SetFactory(new TStreamerInfo());
      return kTRUE;
   };
   static bool doneFactory = setFactory();
   return doneFactory; // avoid unused variable warning.
}
 
////////////////////////////////////////////////////////////////////////////////
/// Register Rdict data for future loading by LoadPCM;
 
void TCling::RegisterRdictForLoadPCM(const std::string &pcmFileNameFullPath, llvm::StringRef *pcmContent)
{
   if (IsFromRootCling())
      return;
 
   if (llvm::sys::fs::exists(pcmFileNameFullPath)) {
      ::Error("TCling::RegisterRdictForLoadPCM", "Rdict '%s' is both in Module extension and in File system.", pcmFileNameFullPath.c_str());
      return;
   }
 
   // The pcmFileNameFullPath must be resolved already because we cannot resolve
   // a link to a non-existent file.
   fPendingRdicts[pcmFileNameFullPath] = *pcmContent;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Tries to load a PCM from TFile; returns true on success.
 
void TCling::LoadPCMImpl(TFile &pcmFile)
{
   auto listOfKeys = pcmFile.GetListOfKeys();
 
   // This is an empty pcm
   if (listOfKeys && ((listOfKeys->GetSize() == 0) ||                           // Nothing here, or
                      ((listOfKeys->GetSize() == 1) &&                          // only one, and
                       !strcmp(((TKey *)listOfKeys->At(0))->GetName(), "EMPTY") // name is EMPTY
                       ))) {
      return;
   }
 
   TObjArray *protoClasses;
   if (gDebug > 1)
      ::Info("TCling::LoadPCMImpl", "reading protoclasses for %s \n", pcmFile.GetName());
 
   pcmFile.GetObject("__ProtoClasses", protoClasses);
 
   if (protoClasses) {
      for (auto obj : *protoClasses) {
         TProtoClass *proto = (TProtoClass *)obj;
         TClassTable::Add(proto);
      }
      // Now that all TClass-es know how to set them up we can update
      // existing TClasses, which might cause the creation of e.g. TBaseClass
      // objects which in turn requires the creation of TClasses, that could
      // come from the PCH, but maybe later in the loop. Instead of resolving
      // a dependency graph the addition to the TClassTable above allows us
      // to create these dependent TClasses as needed below.
      for (auto proto : *protoClasses) {
         if (TClass *existingCl = (TClass *)gROOT->GetListOfClasses()->FindObject(proto->GetName())) {
            // We have an existing TClass object. It might be emulated
            // or interpreted; we now have more information available.
            // Make that available.
            if (existingCl->GetState() != TClass::kHasTClassInit) {
               DictFuncPtr_t dict = gClassTable->GetDict(proto->GetName());
               if (!dict) {
                  ::Error("TCling::LoadPCM", "Inconsistent TClassTable for %s", proto->GetName());
               } else {
                  // This will replace the existing TClass.
                  TClass *ncl = (*dict)();
                  if (ncl)
                     ncl->PostLoadCheck();
               }
            }
         }
      }
 
      protoClasses->Clear(); // Ownership was transfered to TClassTable.
      delete protoClasses;
   }
 
   TObjArray *dataTypes;
   pcmFile.GetObject("__Typedefs", dataTypes);
   if (dataTypes) {
      for (auto typedf : *dataTypes)
         gROOT->GetListOfTypes()->Add(typedf);
      dataTypes->Clear(); // Ownership was transfered to TListOfTypes.
      delete dataTypes;
   }
 
   TObjArray *enums;
   pcmFile.GetObject("__Enums", enums);
   if (enums) {
      // Cache the pointers
      auto listOfGlobals = gROOT->GetListOfGlobals();
      auto listOfEnums = dynamic_cast<THashList *>(gROOT->GetListOfEnums());
      // Loop on enums and then on enum constants
      for (auto selEnum : *enums) {
         const char *enumScope = selEnum->GetTitle();
         const char *enumName = selEnum->GetName();
         if (strcmp(enumScope, "") == 0) {
            // This is a global enum and is added to the
            // list of enums and its constants to the list of globals
            if (!listOfEnums->THashList::FindObject(enumName)) {
               ((TEnum *)selEnum)->SetClass(nullptr);
               listOfEnums->Add(selEnum);
            }
            for (auto enumConstant : *static_cast<TEnum *>(selEnum)->GetConstants()) {
               if (!listOfGlobals->FindObject(enumConstant)) {
                  listOfGlobals->Add(enumConstant);
               }
            }
         } else {
            // This enum is in a namespace. A TClass entry is bootstrapped if
            // none exists yet and the enum is added to it
            TClass *nsTClassEntry = TClass::GetClass(enumScope);
            if (!nsTClassEntry) {
               nsTClassEntry = new TClass(enumScope, 0, TClass::kNamespaceForMeta, true);
            }
            auto listOfEnums = nsTClassEntry->fEnums.load();
            if (!listOfEnums) {
               if ((kIsClass | kIsStruct | kIsUnion) & nsTClassEntry->Property()) {
                  // For this case, the list will be immutable once constructed
                  // (i.e. in this case, by the end of this routine).
                  listOfEnums = nsTClassEntry->fEnums = new TListOfEnums(nsTClassEntry);
               } else {
                  // namespaces can have enums added to them
                  listOfEnums = nsTClassEntry->fEnums = new TListOfEnumsWithLock(nsTClassEntry);
               }
            }
            if (listOfEnums && !listOfEnums->THashList::FindObject(enumName)) {
               ((TEnum *)selEnum)->SetClass(nsTClassEntry);
               listOfEnums->Add(selEnum);
            }
         }
      }
      enums->Clear();
      delete enums;
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Tries to load a rdict PCM, issues diagnostics if it fails.
 
void TCling::LoadPCM(std::string pcmFileNameFullPath)
{
   SuspendAutoLoadingRAII autoloadOff(this);
   SuspendAutoParsing autoparseOff(this);
   assert(!pcmFileNameFullPath.empty());
   assert(llvm::sys::path::is_absolute(pcmFileNameFullPath));
 
   // Easier to work with the ROOT interfaces.
   TString pcmFileName = pcmFileNameFullPath;
 
   // Prevent the ROOT-PCMs hitting this during auto-load during
   // JITting - which will cause recursive compilation.
   // Avoid to call the plugin manager at all.
   R__InitStreamerInfoFactory();
 
   TDirectory::TContext ctxt;
   llvm::SaveAndRestore<Int_t> SaveGDebug(gDebug);
   if (gDebug > 5) {
      gDebug -= 5;
      ::Info("TCling::LoadPCM", "Loading ROOT PCM %s", pcmFileName.Data());
   } else {
      gDebug = 0;
   }
 
   if (llvm::sys::fs::is_symlink_file(pcmFileNameFullPath))
      pcmFileNameFullPath = ROOT::TMetaUtils::GetRealPath(pcmFileNameFullPath);
 
   auto pendingRdict = fPendingRdicts.find(pcmFileNameFullPath);
   if (pendingRdict != fPendingRdicts.end()) {
      llvm::StringRef pcmContent = pendingRdict->second;
      TMemFile::ZeroCopyView_t range{pcmContent.data(), pcmContent.size()};
      std::string RDictFileOpts = pcmFileNameFullPath + "?filetype=pcm";
      TMemFile pcmMemFile(RDictFileOpts.c_str(), range);
 
      LoadPCMImpl(pcmMemFile);
      fPendingRdicts.erase(pendingRdict);
 
      return;
   }
 
   if (!llvm::sys::fs::exists(pcmFileNameFullPath)) {
      ::Error("TCling::LoadPCM", "ROOT PCM %s file does not exist",
              pcmFileNameFullPath.data());
      if (!fPendingRdicts.empty())
         for (const auto &rdict : fPendingRdicts)
            ::Info("TCling::LoadPCM", "In-memory ROOT PCM candidate %s\n",
                   rdict.first.c_str());
      return;
   }
 
   if (!gROOT->IsRootFile(pcmFileName)) {
      Fatal("LoadPCM", "The file %s is not a ROOT as was expected\n", pcmFileName.Data());
      return;
   }
   TFile pcmFile(pcmFileName + "?filetype=pcm", "READ");
   LoadPCMImpl(pcmFile);
}
 
//______________________________________________________________________________
 
namespace {
   using namespace clang;
 
   class ExtLexicalStorageAdder: public RecursiveASTVisitor<ExtLexicalStorageAdder>{
      // This class is to be considered an helper for autoparsing.
      // It visits the AST and marks all classes (in all of their redeclarations)
      // with the setHasExternalLexicalStorage method.
   public:
      bool VisitRecordDecl(clang::RecordDecl* rcd){
         if (gDebug > 2)
            Info("ExtLexicalStorageAdder",
                 "Adding external lexical storage to class %s",
                 rcd->getNameAsString().c_str());
         auto reDeclPtr = rcd->getMostRecentDecl();
         do {
            reDeclPtr->setHasExternalLexicalStorage();
         } while ((reDeclPtr = reDeclPtr->getPreviousDecl()));
 
         return false;
      }
   };
 
 
}
 
////////////////////////////////////////////////////////////////////////////////
///\returns true if the module map was loaded, false on error or if the map was
///         already loaded.
bool TCling::RegisterPrebuiltModulePath(const std::string &FullPath,
                                        const std::string &ModuleMapName /*= "module.modulemap"*/) const
{
   assert(llvm::sys::path::is_absolute(FullPath));
   Preprocessor &PP = fInterpreter->getCI()->getPreprocessor();
   FileManager &FM = PP.getFileManager();
   // FIXME: In a ROOT session we can add an include path (through .I /inc/path)
   // We should look for modulemap files there too.
   const DirectoryEntry *DE = FM.getDirectory(FullPath);
   if (DE) {
      HeaderSearch &HS = PP.getHeaderSearchInfo();
      HeaderSearchOptions &HSOpts = HS.getHeaderSearchOpts();
      const auto &ModPaths = HSOpts.PrebuiltModulePaths;
      bool pathExists = std::find(ModPaths.begin(), ModPaths.end(), FullPath) != ModPaths.end();
      if (!pathExists)
         HSOpts.AddPrebuiltModulePath(FullPath);
      // We cannot use HS.lookupModuleMapFile(DE, /*IsFramework*/ false);
      // because its internal call to getFile has CacheFailure set to true.
      // In our case, modulemaps can appear any time due to ACLiC.
      // Code copied from HS.lookupModuleMapFile.
      llvm::SmallString<256> ModuleMapFileName(DE->getName());
      llvm::sys::path::append(ModuleMapFileName, ModuleMapName);
      const FileEntry *FE = FM.getFile(ModuleMapFileName, /*openFile*/ false,
                                       /*CacheFailure*/ false);
 
      // FIXME: Calling IsLoaded is slow! Replace this with the appropriate
      // call to the clang::ModuleMap class.
      if (FE && !this->IsLoaded(FE->getName().data())) {
         if (!HS.loadModuleMapFile(FE, /*IsSystem*/ false))
            return true;
         Error("RegisterPrebuiltModulePath", "Could not load modulemap in %s", ModuleMapFileName.c_str());
      }
   }
   return false;
}
 
////////////////////////////////////////////////////////////////////////////////
/// List of dicts that have the PCM information already in the PCH.
static const std::unordered_set<std::string> gIgnoredPCMNames = {"libCore",
                                                                 "libRint",
                                                                 "libThread",
                                                                 "libRIO",
                                                                 "libImt",
                                                                 "libcomplexDict",
                                                                 "libdequeDict",
                                                                 "liblistDict",
                                                                 "libforward_listDict",
                                                                 "libvectorDict",
                                                                 "libmapDict",
                                                                 "libmultimap2Dict",
                                                                 "libmap2Dict",
                                                                 "libmultimapDict",
                                                                 "libsetDict",
                                                                 "libmultisetDict",
                                                                 "libunordered_setDict",
                                                                 "libunordered_multisetDict",
                                                                 "libunordered_mapDict",
                                                                 "libunordered_multimapDict",
                                                                 "libvalarrayDict",
                                                                 "G__GenVector32",
                                                                 "G__Smatrix32"};
 
static void PrintDlError(const char *dyLibName, const char *modulename)
{
#ifdef R__WIN32
   char dyLibError[1000];
   FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                  dyLibError, sizeof(dyLibError), NULL);
#else
   const char *dyLibError = dlerror();
#endif
   ::Error("TCling::RegisterModule", "Cannot open shared library %s for dictionary %s:\n  %s", dyLibName, modulename,
           (dyLibError) ? dyLibError : "");
}
 
////////////////////////////////////////////////////////////////////////////////
// Update all the TClass registered in fClassesToUpdate
 
void TCling::ProcessClassesToUpdate()
{
   while (!fClassesToUpdate.empty()) {
      TClass *oldcl = fClassesToUpdate.back().first;
      // If somehow the TClass has already been loaded (maybe it was registered several time),
      // we skip it.  Otherwise, the existing TClass is in mode kInterpreted, kEmulated or
      // maybe even kForwardDeclared and needs to replaced.
      if (oldcl->GetState() != TClass::kHasTClassInit) {
         // if (gDebug > 2) Info("RegisterModule", "Forcing TClass init for %s", oldcl->GetName());
         DictFuncPtr_t dict = fClassesToUpdate.back().second;
         fClassesToUpdate.pop_back();
         // Calling func could manipulate the list so, let maintain the list
         // then call the dictionary function.
         TClass *ncl = dict();
         if (ncl) ncl->PostLoadCheck();
      } else {
         fClassesToUpdate.pop_back();
      }
   }
}
////////////////////////////////////////////////////////////////////////////////
/// Inject the module named "modulename" into cling; load all headers.
/// headers is a 0-terminated array of header files to #include after
/// loading the module. The module is searched for in all $LD_LIBRARY_PATH
/// entries (or %PATH% on Windows).
/// This function gets called by the static initialization of dictionary
/// libraries.
/// The payload code is injected "as is" in the interpreter.
/// The value of 'triggerFunc' is used to find the shared library location.
 
void TCling::RegisterModule(const char* modulename,
                            const char** headers,
                            const char** includePaths,
                            const char* payloadCode,
                            const char* fwdDeclsCode,
                            void (*triggerFunc)(),
                            const FwdDeclArgsToKeepCollection_t& fwdDeclsArgToSkip,
                            const char** classesHeaders,
                            Bool_t lateRegistration /*=false*/,
                            Bool_t hasCxxModule /*=false*/)
{
   const bool fromRootCling = IsFromRootCling();
   // We need the dictionary initialization but we don't want to inject the
   // declarations into the interpreter, except for those we really need for
   // I/O; see rootcling.cxx after the call to TCling__GetInterpreter().
   if (fromRootCling) return;
 
   // When we cannot provide a module for the library we should enable header
   // parsing. This 'mixed' mode ensures gradual migration to modules.
   llvm::SaveAndRestore<bool> SaveHeaderParsing(fHeaderParsingOnDemand);
   fHeaderParsingOnDemand = !hasCxxModule;
 
   // Treat Aclic Libs in a special way. Do not delay the parsing.
   bool hasHeaderParsingOnDemand = fHeaderParsingOnDemand;
   bool isACLiC = strstr(modulename, "_ACLiC_dict") != nullptr;
   if (hasHeaderParsingOnDemand && isACLiC) {
      if (gDebug>1)
         Info("TCling::RegisterModule",
              "Header parsing on demand is active but this is an Aclic library. Disabling it for this library.");
      hasHeaderParsingOnDemand = false;
   }
 
 
   // Make sure we relookup symbols that were search for before we loaded
   // their autoparse information.  We could be more subtil and remove only
   // the failed one or only the one in this module, but for now this is
   // better than nothing.
   fLookedUpClasses.clear();
 
   // Make sure we do not set off AutoLoading or autoparsing during the
   // module registration!
   SuspendAutoLoadingRAII autoLoadOff(this);
 
   for (const char** inclPath = includePaths; *inclPath; ++inclPath) {
      TCling::AddIncludePath(*inclPath);
   }
   cling::Transaction* T = 0;
   // Put the template decls and the number of arguments to skip in the TNormalizedCtxt
   for (auto& fwdDeclArgToSkipPair : fwdDeclsArgToSkip){
      const std::string& fwdDecl = fwdDeclArgToSkipPair.first;
      const int nArgsToSkip = fwdDeclArgToSkipPair.second;
      auto compRes = fInterpreter->declare(fwdDecl.c_str(), &T);
      assert(cling::Interpreter::kSuccess == compRes &&
            "A fwd declaration could not be compiled");
      if (compRes!=cling::Interpreter::kSuccess){
         Warning("TCling::RegisterModule",
               "Problems in declaring string '%s' were encountered.",
               fwdDecl.c_str()) ;
         continue;
      }
 
      // Drill through namespaces recursively until the template is found
      if(ClassTemplateDecl* TD = FindTemplateInNamespace(T->getFirstDecl().getSingleDecl())){
         fNormalizedCtxt->AddTemplAndNargsToKeep(TD->getCanonicalDecl(), nArgsToSkip);
      }
 
   }
 
   // FIXME: Remove #define __ROOTCLING__ once PCMs are there.
   // This is used to give Sema the same view on ACLiC'ed files (which
   // are then #included through the dictionary) as rootcling had.
   TString code = gNonInterpreterClassDef;
   if (payloadCode)
      code += payloadCode;
 
   std::string dyLibName = cling::DynamicLibraryManager::getSymbolLocation(triggerFunc);
   assert(!llvm::sys::fs::is_symlink_file(dyLibName));
 
   if (dyLibName.empty()) {
      ::Error("TCling::RegisterModule", "Dictionary trigger function for %s not found", modulename);
      return;
   }
 
   // The triggerFunc may not be in a shared object but in an executable.
   bool isSharedLib = cling::DynamicLibraryManager::isSharedLibrary(dyLibName);
 
   bool wasDlopened = false;
 
   // If this call happens after dlopen has finished (i.e. late registration)
   // there is no need to dlopen the library recursively. See ROOT-8437 where
   // the dyLibName would correspond to the binary.
   if (!lateRegistration) {
 
      if (isSharedLib) {
         // We need to open the dictionary shared library, to resolve symbols
         // requested by the JIT from it: as the library is currently being dlopen'ed,
         // its symbols are not yet reachable from the process.
         // Recursive dlopen seems to work just fine.
         void* dyLibHandle = dlopen(dyLibName.c_str(), RTLD_LAZY | RTLD_GLOBAL);
         if (dyLibHandle) {
            fRegisterModuleDyLibs.push_back(dyLibHandle);
            wasDlopened = true;
         } else {
            PrintDlError(dyLibName.c_str(), modulename);
         }
      }
   } // if (!lateRegistration)
 
   if (hasHeaderParsingOnDemand && fwdDeclsCode){
      // We now parse the forward declarations. All the classes are then modified
      // in order for them to have an external lexical storage.
      std::string fwdDeclsCodeLessEnums;
      {
         // Search for enum forward decls and only declare them if no
         // declaration exists yet.
         std::string fwdDeclsLine;
         std::istringstream fwdDeclsCodeStr(fwdDeclsCode);
         std::vector<std::string> scopes;
         while (std::getline(fwdDeclsCodeStr, fwdDeclsLine)) {
            const auto enumPos = fwdDeclsLine.find("enum  __attribute__((annotate(\"");
            // We check if the line contains a fwd declaration of an enum
            if (enumPos != std::string::npos) {
               // We clear the scopes which we may have carried from a previous iteration
               scopes.clear();
               // We check if the enum is not in a scope. If yes, save its name
               // and the names of the enclosing scopes.
               if (enumPos != 0) {
                  // it's enclosed in namespaces. We need to understand what they are
                  auto nsPos = fwdDeclsLine.find("namespace");
                  R__ASSERT(nsPos < enumPos && "Inconsistent enum and enclosing scope parsing!");
                  while (nsPos < enumPos && nsPos != std::string::npos) {
                     // we have a namespace, let's put it in the collection of scopes
                     const auto nsNameStart = nsPos + 10;
                     const auto nsNameEnd = fwdDeclsLine.find('{', nsNameStart);
                     const auto nsName = fwdDeclsLine.substr(nsNameStart, nsNameEnd - nsNameStart);
                     scopes.push_back(nsName);
                     nsPos = fwdDeclsLine.find("namespace", nsNameEnd);
                  }
               }
               clang::DeclContext* DC = 0;
               for (auto &&aScope: scopes) {
                  DC = cling::utils::Lookup::Namespace(&fInterpreter->getSema(), aScope.c_str(), DC);
                  if (!DC) {
                     // No decl context means we have to fwd declare the enum.
                     break;
                  }
               }
               if (scopes.empty() || DC) {
                  // We know the scope; let's look for the enum.
                  size_t posEnumName = fwdDeclsLine.find("\"))) ", 32);
                  R__ASSERT(posEnumName != std::string::npos && "Inconsistent enum fwd decl!");
                  posEnumName += 5; // skip "\"))) "
                  while (isspace(fwdDeclsLine[posEnumName]))
                     ++posEnumName;
                  size_t posEnumNameEnd = fwdDeclsLine.find(" : ", posEnumName);
                  R__ASSERT(posEnumNameEnd  != std::string::npos && "Inconsistent enum fwd decl (end)!");
                  while (isspace(fwdDeclsLine[posEnumNameEnd]))
                     --posEnumNameEnd;
                  // posEnumNameEnd now points to the last character of the name.
 
                  std::string enumName = fwdDeclsLine.substr(posEnumName,
                                                             posEnumNameEnd - posEnumName + 1);
 
                  if (clang::NamedDecl* enumDecl
                      = cling::utils::Lookup::Named(&fInterpreter->getSema(),
                                                    enumName.c_str(), DC)) {
                     // We have an existing enum decl (forward or definition);
                     // skip this.
                     R__ASSERT(llvm::dyn_cast<clang::EnumDecl>(enumDecl) && "not an enum decl!");
                     (void)enumDecl;
                     continue;
                  }
               }
            }
 
            fwdDeclsCodeLessEnums += fwdDeclsLine + "\n";
         }
      }
 
      if (fwdDeclsCodeLessEnums.size() != 0){ // Avoid the overhead if nothing is to be declared
         auto compRes = fInterpreter->declare(fwdDeclsCodeLessEnums, &T);
         assert(cling::Interpreter::kSuccess == compRes &&
               "The forward declarations could not be compiled");
         if (compRes!=cling::Interpreter::kSuccess){
            Warning("TCling::RegisterModule",
                  "Problems in compiling forward declarations for module %s: '%s'",
                  modulename, fwdDeclsCodeLessEnums.c_str()) ;
         }
         else if (T){
            // Loop over all decls in the transaction and go through them all
            // to mark them properly.
            // In order to do that, we first iterate over all the DelayedCallInfos
            // within the transaction. Then we loop over all Decls in the DeclGroupRef
            // contained in the DelayedCallInfos. For each decl, we traverse.
            ExtLexicalStorageAdder elsa;
            for (auto dciIt = T->decls_begin();dciIt!=T->decls_end();dciIt++){
               cling::Transaction::DelayCallInfo& dci = *dciIt;
               for(auto dit = dci.m_DGR.begin(); dit != dci.m_DGR.end(); ++dit) {
                  clang::Decl* declPtr = *dit;
                  elsa.TraverseDecl(declPtr);
               }
            }
         }
      }
 
      // Now we register all the headers necessary for the class
      // Typical format of the array:
      //    {"A", "classes.h", "@",
      //     "vector<A>", "vector", "@",
      //     "myClass", payloadCode, "@",
      //    nullptr};
 
      std::string temp;
      for (const char** classesHeader = classesHeaders; *classesHeader; ++classesHeader) {
         temp=*classesHeader;
 
         size_t theTemplateHash = 0;
         bool addTemplate = false;
         size_t posTemplate = temp.find('<');
         if (posTemplate != std::string::npos) {
            // Add an entry for the template itself.
            std::string templateName = temp.substr(0, posTemplate);
            theTemplateHash = fStringHashFunction(templateName);
            addTemplate = true;
         }
         size_t theHash = fStringHashFunction(temp);
         classesHeader++;
         for (const char** classesHeader_inner = classesHeader; 0!=strcmp(*classesHeader_inner,"@"); ++classesHeader_inner,++classesHeader){
            // This is done in order to distinguish headers from files and from the payloadCode
            if (payloadCode == *classesHeader_inner ){
               fPayloads.insert(theHash);
               if (addTemplate) fPayloads.insert(theTemplateHash);
            }
            if (gDebug > 2)
               Info("TCling::RegisterModule",
                     "Adding a header for %s", temp.c_str());
            fClassesHeadersMap[theHash].push_back(*classesHeader_inner);
            if (addTemplate) {
               if (fClassesHeadersMap.find(theTemplateHash) == fClassesHeadersMap.end()) {
                  fClassesHeadersMap[theTemplateHash].push_back(*classesHeader_inner);
               }
               addTemplate = false;
            }
         }
      }
   }
 
   clang::Sema &TheSema = fInterpreter->getSema();
 
   bool ModuleWasSuccessfullyLoaded = false;
   if (hasCxxModule) {
      std::string ModuleName = modulename;
      if (llvm::StringRef(modulename).startswith("lib"))
         ModuleName = llvm::StringRef(modulename).substr(3).str();
 
      // In case we are directly loading the library via gSystem->Load() without
      // specifying the relevant include paths we should try loading the
      // modulemap next to the library location.
      clang::Preprocessor &PP = TheSema.getPreprocessor();
      std::string ModuleMapName;
      if (isACLiC)
         ModuleMapName = ModuleName + ".modulemap";
      else
         ModuleMapName = "module.modulemap";
      RegisterPrebuiltModulePath(llvm::sys::path::parent_path(dyLibName),
                                 ModuleMapName);
 
      // FIXME: We should only complain for modules which we know to exist. For example, we should not complain about
      // modules such as GenVector32 because it needs to fall back to GenVector.
      ModuleWasSuccessfullyLoaded = LoadModule(ModuleName, *fInterpreter);
      if (!ModuleWasSuccessfullyLoaded) {
         // Only report if we found the module in the modulemap.
         clang::HeaderSearch &headerSearch = PP.getHeaderSearchInfo();
         clang::ModuleMap &moduleMap = headerSearch.getModuleMap();
         if (moduleMap.findModule(ModuleName))
            Info("TCling::RegisterModule", "Module %s in modulemap failed to load.", ModuleName.c_str());
      }
   }
 
   if (gIgnoredPCMNames.find(modulename) == gIgnoredPCMNames.end()) {
      llvm::SmallString<256> pcmFileNameFullPath(dyLibName);
      // The path dyLibName might not be absolute. This can happen if dyLibName
      // is linked to an executable in the same folder.
      llvm::sys::fs::make_absolute(pcmFileNameFullPath);
      llvm::sys::path::remove_filename(pcmFileNameFullPath);
      llvm::sys::path::append(pcmFileNameFullPath,
                              ROOT::TMetaUtils::GetModuleFileName(modulename));
      LoadPCM(pcmFileNameFullPath.str().str());
   }
 
   { // scope within which diagnostics are de-activated
   // For now we disable diagnostics because we saw them already at
   // dictionary generation time. That won't be an issue with the PCMs.
 
      clangDiagSuppr diagSuppr(TheSema.getDiagnostics());
 
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
      Warning("TCling::RegisterModule","Diagnostics suppression should be gone by now.");
#endif
#endif
 
      if (!ModuleWasSuccessfullyLoaded && !hasHeaderParsingOnDemand){
         SuspendAutoParsing autoParseRaii(this);
 
         const cling::Transaction* watermark = fInterpreter->getLastTransaction();
         cling::Interpreter::CompilationResult compRes = fInterpreter->parseForModule(code.Data());
         if (isACLiC) {
            // Register an unload point.
            fMetaProcessor->registerUnloadPoint(watermark, headers[0]);
         }
 
         assert(cling::Interpreter::kSuccess == compRes &&
                        "Payload code of a dictionary could not be parsed correctly.");
         if (compRes!=cling::Interpreter::kSuccess) {
            Warning("TCling::RegisterModule",
                  "Problems declaring payload for module %s.", modulename) ;
         }
      }
   }
 
   // Now that all the header have been registered/compiled, let's
   // make sure to 'reset' the TClass that have a class init in this module
   // but already had their type information available (using information/header
   // loaded from other modules or from class rules or from opening a TFile
   // or from loading header in a way that did not provoke the loading of
   // the library we just loaded).
   ProcessClassesToUpdate();
 
   if (!ModuleWasSuccessfullyLoaded && !hasHeaderParsingOnDemand) {
      // __ROOTCLING__ might be pulled in through PCH
      fInterpreter->declare("#ifdef __ROOTCLING__\n"
                            "#undef __ROOTCLING__\n"
                            + gInterpreterClassDef +
                            "#endif");
   }
 
   if (wasDlopened) {
      assert(isSharedLib);
      void* dyLibHandle = fRegisterModuleDyLibs.back();
      fRegisterModuleDyLibs.pop_back();
      dlclose(dyLibHandle);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Register classes that already existed prior to their dictionary loading
/// and that already had a ClassInfo (and thus would not be refresh via
/// UpdateClassInfo.
 
void TCling::RegisterTClassUpdate(TClass *oldcl,DictFuncPtr_t dict)
{
   fClassesToUpdate.push_back(std::make_pair(oldcl,dict));
}
 
////////////////////////////////////////////////////////////////////////////////
/// If the dictionary is loaded, we can remove the class from the list
/// (otherwise the class might be loaded twice).
 
void TCling::UnRegisterTClassUpdate(const TClass *oldcl)
{
   typedef std::vector<std::pair<TClass*,DictFuncPtr_t> >::iterator iterator;
   iterator stop = fClassesToUpdate.end();
   for(iterator i = fClassesToUpdate.begin();
       i != stop;
       ++i)
   {
      if ( i->first == oldcl ) {
         fClassesToUpdate.erase(i);
         return;
      }
   }
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Let cling process a command line.
///
/// If the command is executed and the error is 0, then the return value
/// is the int value corresponding to the result of the executed command
/// (float and double return values will be truncated).
///
 
// Method for handling the interpreter exceptions.
// the MetaProcessor is passing in as argument to teh function, because
// cling::Interpreter::CompilationResult is a nested class and it cannot be
// forward declared, thus this method cannot be a static member function
// of TCling.
 
static int HandleInterpreterException(cling::MetaProcessor* metaProcessor,
                                 const char* input_line,
                                 cling::Interpreter::CompilationResult& compRes,
                                 cling::Value* result)
{
   try {
      return metaProcessor->process(input_line, compRes, result);
   }
   catch (cling::InterpreterException& ex)
   {
      Error("HandleInterpreterException", "%s.\n%s", ex.what(), "Execution of your code was aborted.");
      ex.diagnose();
      compRes = cling::Interpreter::kFailure;
   }
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
 
bool TCling::DiagnoseIfInterpreterException(const std::exception &e) const
{
   if (auto ie = dynamic_cast<const cling::InterpreterException*>(&e)) {
      ie->diagnose();
      return true;
   }
   return false;
}
 
////////////////////////////////////////////////////////////////////////////////
 
Long_t TCling::ProcessLine(const char* line, EErrorCode* error/*=0*/)
{
   // Copy the passed line, it comes from a static buffer in TApplication
   // which can be reentered through the Cling evaluation routines,
   // which would overwrite the static buffer and we would forget what we
   // were doing.
   //
   TString sLine(line);
   if (strstr(line,fantomline)) {
      // End-Of-Line action
      // See the comment (copied from above):
      // It is a "fantom" method to synchronize user keyboard input
      // and ROOT prompt line (for WIN32)
      // and is implemented by
      if (gApplication) {
         if (gApplication->IsCmdThread()) {
            R__LOCKGUARD(fLockProcessLine ? gInterpreterMutex : 0);
            gROOT->SetLineIsProcessing();
 
            UpdateAllCanvases();
 
            gROOT->SetLineHasBeenProcessed();
         }
      }
      return 0;
   }
 
   if (gGlobalMutex && !gInterpreterMutex && fLockProcessLine) {
      gGlobalMutex->Lock();
      if (!gInterpreterMutex)
         gInterpreterMutex = gGlobalMutex->Factory(kTRUE);
      gGlobalMutex->UnLock();
   }
   R__LOCKGUARD_CLING(fLockProcessLine ? gInterpreterMutex : 0);
   gROOT->SetLineIsProcessing();
 
   struct InterpreterFlagsRAII {
      cling::Interpreter* fInterpreter;
      bool fWasDynamicLookupEnabled;
 
      InterpreterFlagsRAII(cling::Interpreter* interp):
         fInterpreter(interp),
         fWasDynamicLookupEnabled(interp->isDynamicLookupEnabled())
      {
         fInterpreter->enableDynamicLookup(true);
      }
      ~~InterpreterFlagsRAII() {
         fInterpreter->enableDynamicLookup(fWasDynamicLookupEnabled);
         gROOT->SetLineHasBeenProcessed();
      }
   } interpreterFlagsRAII(GetInterpreterImpl());
 
   // A non-zero returned value means the given line was
   // not a complete statement.
   int indent = 0;
   // This will hold the resulting value of the evaluation the given line.
   cling::Value result;
   cling::Interpreter::CompilationResult compRes = cling::Interpreter::kSuccess;
   if (!strncmp(sLine.Data(), ".L", 2) || !strncmp(sLine.Data(), ".x", 2) ||
       !strncmp(sLine.Data(), ".X", 2)) {
      // If there was a trailing "+", then CINT compiled the code above,
      // and we will need to strip the "+" before passing the line to cling.
      TString mod_line(sLine);
      TString aclicMode;
      TString arguments;
      TString io;
      TString fname = gSystem->SplitAclicMode(sLine.Data() + 3,
         aclicMode, arguments, io);
      if (aclicMode.Length()) {
         // Remove the leading '+'
         R__ASSERT(aclicMode[0]=='+' && "ACLiC mode must start with a +");
         aclicMode[0]='k';    // We always want to keep the .so around.
         if (aclicMode[1]=='+') {
            // We have a 2nd +
            aclicMode[1]='f'; // We want to force the recompilation.
         }
         if (!gSystem->CompileMacro(fname,aclicMode)) {
            // ACLiC failed.
            compRes = cling::Interpreter::kFailure;
         } else {
            if (strncmp(sLine.Data(), ".L", 2) != 0) {
               // if execution was requested.
 
               if (arguments.Length()==0) {
                  arguments = "()";
               }
               // We need to remove the extension.
               Ssiz_t ext = fname.Last('.');
               if (ext != kNPOS) {
                  fname.Remove(ext);
               }
               const char *function = gSystem->BaseName(fname);
               mod_line = function + arguments + io;
               indent = HandleInterpreterException(GetMetaProcessorImpl(), mod_line, compRes, &result);
            }
         }
      } else {
         // not ACLiC
         size_t unnamedMacroOpenCurly;
         {
            std::string code;
            std::string codeline;
            std::ifstream in(fname);
            while (in) {
               std::getline(in, codeline);
               code += codeline + "\n";
            }
            unnamedMacroOpenCurly
              = cling::utils::isUnnamedMacro(code, fInterpreter->getCI()->getLangOpts());
         }
 
         fCurExecutingMacros.push_back(fname);
         if (unnamedMacroOpenCurly != std::string::npos) {
            compRes = fMetaProcessor->readInputFromFile(fname.Data(), &result,
                                                        unnamedMacroOpenCurly);
         } else {
            // No DynLookup for .x, .L of named macros.
            fInterpreter->enableDynamicLookup(false);
            indent = HandleInterpreterException(GetMetaProcessorImpl(), mod_line, compRes, &result);
         }
         fCurExecutingMacros.pop_back();
      }
   } // .L / .X / .x
   else {
      if (0!=strncmp(sLine.Data(), ".autodict ",10) && sLine != ".autodict") {
         // explicitly ignore .autodict without having to support it
         // in cling.
 
         // Turn off autoparsing if this is an include directive
         bool isInclusionDirective = sLine.Contains("\n#include") || sLine.BeginsWith("#include");
         if (isInclusionDirective) {
            SuspendAutoParsing autoParseRaii(this);
            indent = HandleInterpreterException(GetMetaProcessorImpl(), sLine, compRes, &result);
         } else {
            indent = HandleInterpreterException(GetMetaProcessorImpl(), sLine, compRes, &result);
         }
      }
   }
   if (result.isValid())
      RegisterTemporary(result);
   if (indent) {
      if (error)
         *error = kProcessing;
      return 0;
   }
   if (error) {
      switch (compRes) {
      case cling::Interpreter::kSuccess: *error = kNoError; break;
      case cling::Interpreter::kFailure: *error = kRecoverable; break;
      case cling::Interpreter::kMoreInputExpected: *error = kProcessing; break;
      }
   }
   if (compRes == cling::Interpreter::kSuccess
       && result.isValid()
       && !result.isVoid())
   {
      return result.simplisticCastAs<long>();
   }
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// No-op; see TRint instead.
 
void TCling::PrintIntro()
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Add the given path to the list of directories in which the interpreter
/// looks for include files. Only one path item can be specified at a
/// time, i.e. "path1:path2" is NOT supported.
 
void TCling::AddIncludePath(const char *path)
{
   R__LOCKGUARD(gInterpreterMutex);
   // Favorite source of annoyance: gSystem->AddIncludePath() needs "-I",
   // gCling->AddIncludePath() does not! Work around that inconsistency:
   if (path[0] == '-' && path[1] == 'I')
      path += 2;
 
   fInterpreter->AddIncludePath(path);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Visit all members over members, recursing over base classes.
 
void TCling::InspectMembers(TMemberInspector& insp, const void* obj,
                            const TClass* cl, Bool_t isTransient)
{
   if (insp.GetObjectValidity() == TMemberInspector::kUnset) {
      insp.SetObjectValidity(obj ? TMemberInspector::kValidObjectGiven
                             : TMemberInspector::kNoObjectGiven);
   }
 
   if (!cl || cl->GetCollectionProxy()) {
      // We do not need to investigate the content of the STL
      // collection, they are opaque to us (and details are
      // uninteresting).
      return;
   }
 
   static const TClassRef clRefString("std::string");
   if (clRefString == cl) {
      // We stream std::string without going through members..
      return;
   }
 
   if (TClassEdit::IsStdArray(cl->GetName())) {
      // We treat std arrays as C arrays
      return;
   }
 
   const char* cobj = (const char*) obj; // for ptr arithmetics
 
   // Treat the case of std::complex in a special manner. We want to enforce
   // the layout of a stl implementation independent class, which is the
   // complex as implemented in ROOT5.
 
   // A simple lambda to simplify the code
   auto inspInspect =  [&] (ptrdiff_t offset){
      insp.Inspect(const_cast<TClass*>(cl), insp.GetParent(), "_real", cobj, isTransient);
      insp.Inspect(const_cast<TClass*>(cl), insp.GetParent(), "_imag", cobj + offset, isTransient);
   };
 
   auto complexType = TClassEdit::GetComplexType(cl->GetName());
   switch(complexType) {
      case TClassEdit::EComplexType::kNone:
      {
        break;
      }
      case TClassEdit::EComplexType::kFloat:
      {
        inspInspect(sizeof(float));
        return;
      }
      case TClassEdit::EComplexType::kDouble:
      {
        inspInspect(sizeof(double));
        return;
      }
      case TClassEdit::EComplexType::kInt:
      {
        inspInspect(sizeof(int));
        return;
      }
      case TClassEdit::EComplexType::kLong:
      {
        inspInspect(sizeof(long));
        return;
      }
   }
 
   static clang::PrintingPolicy
      printPol(fInterpreter->getCI()->getLangOpts());
   if (printPol.Indentation) {
      // not yet initialized
      printPol.Indentation = 0;
      printPol.SuppressInitializers = true;
   }
 
   const char* clname = cl->GetName();
   // Printf("Inspecting class %s\n", clname);
 
   const clang::ASTContext& astContext = fInterpreter->getCI()->getASTContext();
   const clang::Decl *scopeDecl = 0;
   const clang::Type *recordType = 0;
 
   if (cl->GetClassInfo()) {
      TClingClassInfo * clingCI = (TClingClassInfo *)cl->GetClassInfo();
      scopeDecl = clingCI->GetDecl();
      recordType = clingCI->GetType();
   } else {
      const cling::LookupHelper& lh = fInterpreter->getLookupHelper();
      // Diags will complain about private classes:
      scopeDecl = lh.findScope(clname, cling::LookupHelper::NoDiagnostics,
                               &recordType);
   }
   if (!scopeDecl) {
      Error("InspectMembers", "Cannot find Decl for class %s", clname);
      return;
   }
   const clang::CXXRecordDecl* recordDecl
     = llvm::dyn_cast<const clang::CXXRecordDecl>(scopeDecl);
   if (!recordDecl) {
      Error("InspectMembers", "Cannot find Decl for class %s is not a CXXRecordDecl.", clname);
      return;
   }
 
   {
      // Force possible deserializations first. We need to have no pending
      // Transaction when passing control flow to the inspector below (ROOT-7779).
      cling::Interpreter::PushTransactionRAII deserRAII(GetInterpreterImpl());
 
      astContext.getASTRecordLayout(recordDecl);
 
      for (clang::RecordDecl::field_iterator iField = recordDecl->field_begin(),
              eField = recordDecl->field_end(); iField != eField; ++iField) {}
   }
 
   const clang::ASTRecordLayout& recLayout
      = astContext.getASTRecordLayout(recordDecl);
 
   // TVirtualCollectionProxy *proxy = cl->GetCollectionProxy();
   // if (proxy && ( proxy->GetProperties() & TVirtualCollectionProxy::kIsEmulated ) ) {
   //    Error("InspectMembers","The TClass for %s has an emulated proxy but we are looking at a compiled version of the collection!\n",
   //          cl->GetName());
   // }
   if (cl->Size() != recLayout.getSize().getQuantity()) {
      Error("InspectMembers","TClass and cling disagree on the size of the class %s, respectively %d %lld\n",
            cl->GetName(),cl->Size(),(Long64_t)recLayout.getSize().getQuantity());
   }
 
   unsigned iNField = 0;
   // iterate over fields
   // FieldDecls are non-static, else it would be a VarDecl.
   for (clang::RecordDecl::field_iterator iField = recordDecl->field_begin(),
        eField = recordDecl->field_end(); iField != eField;
        ++iField, ++iNField) {
 
 
      clang::QualType memberQT = iField->getType();
      if (recordType) {
         // if (we_need_to_do_the_subst_because_the_class_is_a_template_instance_of_double32_t)
         memberQT = ROOT::TMetaUtils::ReSubstTemplateArg(memberQT, recordType);
      }
      memberQT = cling::utils::Transform::GetPartiallyDesugaredType(astContext, memberQT, fNormalizedCtxt->GetConfig(), false /* fully qualify */);
      if (memberQT.isNull()) {
         std::string memberName;
         llvm::raw_string_ostream stream(memberName);
         // Don't trigger fopen of the source file to count lines:
         printPol.AnonymousTagLocations = false;
         iField->getNameForDiagnostic(stream, printPol, true /*fqi*/);
         stream.flush();
         Error("InspectMembers",
               "Cannot retrieve QualType for member %s while inspecting class %s",
               memberName.c_str(), clname);
         continue; // skip member
      }
      const clang::Type* memType = memberQT.getTypePtr();
      if (!memType) {
         std::string memberName;
         llvm::raw_string_ostream stream(memberName);
         // Don't trigger fopen of the source file to count lines:
         printPol.AnonymousTagLocations = false;
         iField->getNameForDiagnostic(stream, printPol, true /*fqi*/);
         stream.flush();
         Error("InspectMembers",
               "Cannot retrieve Type for member %s while inspecting class %s",
               memberName.c_str(), clname);
         continue; // skip member
      }
 
      const clang::Type* memNonPtrType = memType;
      Bool_t ispointer = false;
      if (memNonPtrType->isPointerType()) {
         ispointer = true;
         clang::QualType ptrQT
            = memNonPtrType->getAs<clang::PointerType>()->getPointeeType();
         if (recordType) {
            // if (we_need_to_do_the_subst_because_the_class_is_a_template_instance_of_double32_t)
            ptrQT = ROOT::TMetaUtils::ReSubstTemplateArg(ptrQT, recordType);
         }
         ptrQT = cling::utils::Transform::GetPartiallyDesugaredType(astContext, ptrQT, fNormalizedCtxt->GetConfig(), false /* fully qualify */);
         if (ptrQT.isNull()) {
            std::string memberName;
            llvm::raw_string_ostream stream(memberName);
            // Don't trigger fopen of the source file to count lines:
            printPol.AnonymousTagLocations = false;
            iField->getNameForDiagnostic(stream, printPol, true /*fqi*/);
            stream.flush();
            Error("InspectMembers",
                  "Cannot retrieve pointee Type for member %s while inspecting class %s",
                  memberName.c_str(), clname);
            continue; // skip member
         }
         memNonPtrType = ptrQT.getTypePtr();
      }
 
      // assemble array size(s): "[12][4][]"
      llvm::SmallString<8> arraySize;
      const clang::ArrayType* arrType = memNonPtrType->getAsArrayTypeUnsafe();
      unsigned arrLevel = 0;
      bool haveErrorDueToArray = false;
      while (arrType) {
         ++arrLevel;
         arraySize += '[';
         const clang::ConstantArrayType* constArrType =
         clang::dyn_cast<clang::ConstantArrayType>(arrType);
         if (constArrType) {
            constArrType->getSize().toStringUnsigned(arraySize);
         }
         arraySize += ']';
         clang::QualType subArrQT = arrType->getElementType();
         if (subArrQT.isNull()) {
            std::string memberName;
            llvm::raw_string_ostream stream(memberName);
            // Don't trigger fopen of the source file to count lines:
            printPol.AnonymousTagLocations = false;
            iField->getNameForDiagnostic(stream, printPol, true /*fqi*/);
            stream.flush();
            Error("InspectMembers",
                  "Cannot retrieve QualType for array level %d (i.e. element type of %s) for member %s while inspecting class %s",
                  arrLevel, subArrQT.getAsString(printPol).c_str(),
                  memberName.c_str(), clname);
            haveErrorDueToArray = true;
            break;
         }
         arrType = subArrQT.getTypePtr()->getAsArrayTypeUnsafe();
      }
      if (haveErrorDueToArray) {
         continue; // skip member
      }
 
      // construct member name
      std::string fieldName;
      if (memType->isPointerType()) {
         fieldName = "*";
      }
 
      // Check if this field has a custom ioname, if not, just use the one of the decl
      std::string ioname(iField->getName());
      ROOT::TMetaUtils::ExtractAttrPropertyFromName(**iField,"ioname",ioname);
      fieldName += ioname;
      fieldName += arraySize;
 
      // get member offset
      // NOTE currently we do not support bitfield and do not support
      // member that are not aligned on 'bit' boundaries.
      clang::CharUnits offset(astContext.toCharUnitsFromBits(recLayout.getFieldOffset(iNField)));
      ptrdiff_t fieldOffset = offset.getQuantity();
 
      // R__insp.Inspect(R__cl, R__insp.GetParent(), "fBits[2]", fBits);
      // R__insp.Inspect(R__cl, R__insp.GetParent(), "fName", &fName);
      // R__insp.InspectMember(fName, "fName.");
      // R__insp.Inspect(R__cl, R__insp.GetParent(), "*fClass", &fClass);
 
      // If the class has a custom streamer and the type of the filed is a
      // private enum, struct or class, skip it.
      if (!insp.IsTreatingNonAccessibleTypes()){
         auto iFiledQtype = iField->getType();
         if (auto tagDecl = iFiledQtype->getAsTagDecl()){
            auto declAccess = tagDecl->getAccess();
            if (declAccess == AS_private || declAccess == AS_protected) {
               continue;
            }
         }
      }
 
      insp.Inspect(const_cast<TClass*>(cl), insp.GetParent(), fieldName.c_str(), cobj + fieldOffset, isTransient);
 
      if (!ispointer) {
         const clang::CXXRecordDecl* fieldRecDecl = memNonPtrType->getAsCXXRecordDecl();
         if (fieldRecDecl && !fieldRecDecl->isAnonymousStructOrUnion()) {
            // nested objects get an extra call to InspectMember
            // R__insp.InspectMember("FileStat_t", (void*)&fFileStat, "fFileStat.", false);
            std::string sFieldRecName;
            if (!ROOT::TMetaUtils::ExtractAttrPropertyFromName(*fieldRecDecl,"iotype",sFieldRecName)){
               ROOT::TMetaUtils::GetNormalizedName(sFieldRecName,
                                                   clang::QualType(memNonPtrType,0),
                                                   *fInterpreter,
                                                   *fNormalizedCtxt);
            }
 
            TDataMember* mbr = cl->GetDataMember(ioname.c_str());
            // if we can not find the member (which should not really happen),
            // let's consider it transient.
            Bool_t transient = isTransient || !mbr || !mbr->IsPersistent();
 
            insp.InspectMember(sFieldRecName.c_str(), cobj + fieldOffset,
                               (fieldName + '.').c_str(), transient);
 
         }
      }
   } // loop over fields
 
   // inspect bases
   // TNamed::ShowMembers(R__insp);
   unsigned iNBase = 0;
   for (clang::CXXRecordDecl::base_class_const_iterator iBase
        = recordDecl->bases_begin(), eBase = recordDecl->bases_end();
        iBase != eBase; ++iBase, ++iNBase) {
      clang::QualType baseQT = iBase->getType();
      if (baseQT.isNull()) {
         Error("InspectMembers",
               "Cannot find QualType for base number %d while inspecting class %s",
               iNBase, clname);
         continue;
      }
      const clang::CXXRecordDecl* baseDecl
         = baseQT->getAsCXXRecordDecl();
      if (!baseDecl) {
         Error("InspectMembers",
               "Cannot find CXXRecordDecl for base number %d while inspecting class %s",
               iNBase, clname);
         continue;
      }
      TClass* baseCl=nullptr;
      std::string sBaseName;
      // Try with the DeclId
      std::vector<TClass*> foundClasses;
      TClass::GetClass(static_cast<DeclId_t>(baseDecl), foundClasses);
      if (foundClasses.size()==1){
         baseCl=foundClasses[0];
      } else {
         // Try with the normalised Name, as a fallback
         if (!baseCl){
            ROOT::TMetaUtils::GetNormalizedName(sBaseName,
                                                baseQT,
                                                *fInterpreter,
                                                *fNormalizedCtxt);
            baseCl = TClass::GetClass(sBaseName.c_str());
         }
      }
 
      if (!baseCl){
         std::string qualNameForDiag;
         ROOT::TMetaUtils::GetQualifiedName(qualNameForDiag, *baseDecl);
         Error("InspectMembers",
               "Cannot find TClass for base class %s", qualNameForDiag.c_str() );
         continue;
      }
 
      int64_t baseOffset;
      if (iBase->isVirtual()) {
         if (insp.GetObjectValidity() == TMemberInspector::kNoObjectGiven) {
            if (!isTransient) {
               Error("InspectMembers",
                     "Base %s of class %s is virtual but no object provided",
                     sBaseName.c_str(), clname);
            }
            baseOffset = TVirtualStreamerInfo::kNeedObjectForVirtualBaseClass;
         } else {
            // We have an object to determine the vbase offset.
            TClingClassInfo* ci = (TClingClassInfo*)cl->GetClassInfo();
            TClingClassInfo* baseCi = (TClingClassInfo*)baseCl->GetClassInfo();
            if (ci && baseCi) {
               baseOffset = ci->GetBaseOffset(baseCi, const_cast<void*>(obj),
                                              true /*isDerivedObj*/);
               if (baseOffset == -1) {
                  Error("InspectMembers",
                        "Error calculating offset of virtual base %s of class %s",
                        sBaseName.c_str(), clname);
               }
            } else {
               Error("InspectMembers",
                     "Cannot calculate offset of virtual base %s of class %s",
                     sBaseName.c_str(), clname);
               continue;
            }
         }
      } else {
         baseOffset = recLayout.getBaseClassOffset(baseDecl).getQuantity();
      }
      // TOFIX: baseCl can be null here!
      if (baseCl->IsLoaded()) {
         // For loaded class, CallShowMember will (especially for TObject)
         // call the virtual ShowMember rather than the class specific version
         // resulting in an infinite recursion.
         InspectMembers(insp, cobj + baseOffset, baseCl, isTransient);
      } else {
         baseCl->CallShowMembers(cobj + baseOffset,
                                 insp, isTransient);
      }
   } // loop over bases
}
 
////////////////////////////////////////////////////////////////////////////////
/// Reset the interpreter internal state in case a previous action was not correctly
/// terminated.
 
void TCling::ClearFileBusy()
{
   // No-op there is not equivalent state (to be cleared) in Cling.
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete existing temporary values.
 
void TCling::ClearStack()
{
   // No-op for cling due to cling::Value.
}
 
////////////////////////////////////////////////////////////////////////////////
/// Declare code to the interpreter, without any of the interpreter actions
/// that could trigger a re-interpretation of the code. I.e. make cling
/// behave like a compiler: no dynamic lookup, no input wrapping for
/// subsequent execution, no automatic provision of declarations but just a
/// plain #include.
/// Returns true on success, false on failure.
 
bool TCling::Declare(const char* code)
{
   R__LOCKGUARD_CLING(gInterpreterMutex);
 
   SuspendAutoLoadingRAII autoLoadOff(this);
   SuspendAutoParsing autoParseRaii(this);
 
   bool oldDynLookup = fInterpreter->isDynamicLookupEnabled();
   fInterpreter->enableDynamicLookup(false);
   bool oldRawInput = fInterpreter->isRawInputEnabled();
   fInterpreter->enableRawInput(true);
 
   Bool_t ret = LoadText(code);
 
   fInterpreter->enableRawInput(oldRawInput);
   fInterpreter->enableDynamicLookup(oldDynLookup);
   return ret;
}
 
////////////////////////////////////////////////////////////////////////////////
/// It calls a "fantom" method to synchronize user keyboard input
/// and ROOT prompt line.
 
void TCling::EndOfLineAction()
{
   ProcessLineSynch(fantomline);
}
 
// This static function is a hop of TCling::IsLibraryLoaded, which is taking a lock and calling
// into this function. This is because we wanted to avoid a duplication in TCling::IsLoaded, which
// was already taking a lock.
static Bool_t s_IsLibraryLoaded(const char* libname, cling::Interpreter* fInterpreter)
{
   // Check shared library.
   TString tLibName(libname);
   if (gSystem->FindDynamicLibrary(tLibName, kTRUE))
      return fInterpreter->getDynamicLibraryManager()->isLibraryLoaded(tLibName.Data());
   return false;
}
 
Bool_t TCling::IsLibraryLoaded(const char* libname) const
{
   R__LOCKGUARD(gInterpreterMutex);
   return s_IsLibraryLoaded(libname, GetInterpreterImpl());
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return true if ROOT has cxxmodules pcm for a given library name.
// FIXME: We need to be able to support lazy loading of pcm generated by ACLiC.
Bool_t TCling::HasPCMForLibrary(const char *libname) const
{
   llvm::StringRef ModuleName(libname);
   ModuleName = llvm::sys::path::stem(ModuleName);
   ModuleName.consume_front("lib");
 
   // FIXME: In case when the modulemap is not yet loaded we will return the
   // wrong result. Consider a call to HasPCMForLibrary(../test/libEvent.so)
   // We will only load the modulemap for libEvent.so after we dlopen libEvent
   // which may happen after calling this interface. Maybe we should also check
   // if there is a Event.pcm file and a module.modulemap, load it and return
   // true.
   clang::ModuleMap &moduleMap = fInterpreter->getCI()->getPreprocessor().getHeaderSearchInfo().getModuleMap();
   clang::Module *M = moduleMap.findModule(ModuleName);
   return M && !M->IsMissingRequirement && M->getASTFile();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return true if the file has already been loaded by cint.
/// We will try in this order:
///   actual filename
///   filename as a path relative to
///            the include path
///            the shared library path
 
Bool_t TCling::IsLoaded(const char* filename) const
{
   R__LOCKGUARD(gInterpreterMutex);
 
   //FIXME: if we use llvm::sys::fs::make_absolute all this can go away. See
   // cling::DynamicLibraryManager.
 
   std::string file_name = filename;
   size_t at = std::string::npos;
   while ((at = file_name.find("/./")) != std::string::npos)
       file_name.replace(at, 3, "/");
 
   std::string filesStr = "";
   llvm::raw_string_ostream filesOS(filesStr);
   clang::SourceManager &SM = fInterpreter->getCI()->getSourceManager();
   cling::ClangInternalState::printIncludedFiles(filesOS, SM);
   filesOS.flush();
 
   llvm::SmallVector<llvm::StringRef, 100> files;
   llvm::StringRef(filesStr).split(files, "\n");
 
   std::set<std::string> fileMap;
   // Fill fileMap; return early on exact match.
   for (llvm::SmallVector<llvm::StringRef, 100>::const_iterator
           iF = files.begin(), iE = files.end(); iF != iE; ++iF) {
      if ((*iF) == file_name.c_str()) return kTRUE; // exact match
      fileMap.insert(*iF);
   }
 
   if (fileMap.empty()) return kFALSE;
 
   // Check MacroPath.
   TString sFilename(file_name.c_str());
   if (gSystem->FindFile(TROOT::GetMacroPath(), sFilename, kReadPermission)
       && fileMap.count(sFilename.Data())) {
      return kTRUE;
   }
 
   // Check IncludePath.
   TString incPath = gSystem->GetIncludePath(); // of the form -Idir1  -Idir2 -Idir3
   incPath.Append(":").Prepend(" "); // to match " -I" (note leading ' ')
   incPath.ReplaceAll(" -I", ":");      // of form :dir1 :dir2:dir3
   while (incPath.Index(" :") != -1) {
      incPath.ReplaceAll(" :", ":");
   }
   incPath.Prepend(".:");
   sFilename = file_name.c_str();
   if (gSystem->FindFile(incPath, sFilename, kReadPermission)
       && fileMap.count(sFilename.Data())) {
      return kTRUE;
   }
 
   // Check shared library.
   if (s_IsLibraryLoaded(file_name.c_str(), GetInterpreterImpl()))
      return kTRUE;
 
   //FIXME: We must use the cling::Interpreter::lookupFileOrLibrary iface.
   const clang::DirectoryLookup *CurDir = 0;
   clang::Preprocessor &PP = fInterpreter->getCI()->getPreprocessor();
   clang::HeaderSearch &HS = PP.getHeaderSearchInfo();
   const clang::FileEntry *FE = HS.LookupFile(file_name.c_str(),
                                              clang::SourceLocation(),
                                              /*isAngled*/ false,
                                              /*FromDir*/ 0, CurDir,
                                              clang::ArrayRef<std::pair<const clang::FileEntry *,
                                                                        const clang::DirectoryEntry *>>(),
                                              /*SearchPath*/ 0,
                                              /*RelativePath*/ 0,
                                              /*RequestingModule*/ 0,
                                              /*SuggestedModule*/ 0,
                                              /*IsMapped*/ 0,
                                              /*SkipCache*/ false,
                                              /*BuildSystemModule*/ false,
                                              /*OpenFile*/ false,
                                              /*CacheFail*/ false);
   if (FE && FE->isValid()) {
      // check in the source manager if the file is actually loaded
      clang::SourceManager &SM = fInterpreter->getCI()->getSourceManager();
      // this works only with header (and source) files...
      clang::FileID FID = SM.translateFile(FE);
      if (!FID.isInvalid() && FID.getHashValue() == 0)
         return kFALSE;
      else {
         clang::SrcMgr::SLocEntry SLocE = SM.getSLocEntry(FID);
         if (SLocE.isFile() && SLocE.getFile().getContentCache()->getRawBuffer() == 0)
            return kFALSE;
         if (!FID.isInvalid())
            return kTRUE;
      }
      // ...then check shared library again, but with full path now
      sFilename = FE->getName();
      if (gSystem->FindDynamicLibrary(sFilename, kTRUE)
          && fileMap.count(sFilename.Data())) {
         return kTRUE;
      }
   }
   return kFALSE;
}
 
 
#if defined(R__MACOSX)
 
////////////////////////////////////////////////////////////////////////////////
/// Check if lib is in the dynamic linker cache, returns true if it is, and if so,
/// modifies the library file name parameter `lib` from `/usr/lib/libFOO.dylib`
/// to `-lFOO` such that it can be passed to the linker.
/// This is a unique feature of macOS 11.
 
static bool R__UpdateLibFileForLinking(TString &lib)
{
   const char *mapfile = nullptr;
#if __x86_64__
   mapfile = "/System/Library/dyld/dyld_shared_cache_x86_64.map";
#elif __arm64__
   mapfile = "/System/Library/dyld/dyld_shared_cache_arm64e.map";
#else
   #error unsupported architecture
#endif
   if (std::ifstream cacheMap{mapfile}) {
      std::string line;
      while (getline(cacheMap, line)) {
         if (line.find(lib) != std::string::npos) {
            lib.ReplaceAll("/usr/lib/lib","-l");
            lib.ReplaceAll(".dylib","");
            return true;
         }
      }
      return false;
   }
   return false;
}
#endif // R__MACOSX
 
#ifdef R__LINUX
 
////////////////////////////////////////////////////////////////////////////////
/// Callback for dl_iterate_phdr(), see `man dl_iterate_phdr`.
/// Collects opened libraries.
 
static int callback_for_dl_iterate_phdr(struct dl_phdr_info *info, size_t size, void *data)
{
   // This function is called through UpdateListOfLoadedSharedLibraries() which is locked.
   static std::unordered_set<decltype(info->dlpi_addr)> sKnownLoadedLibBaseAddrs;
 
   auto newLibs = static_cast<std::vector<std::string>*>(data);
   if (!sKnownLoadedLibBaseAddrs.count(info->dlpi_addr)) {
      // Skip \0, "", and kernel pseudo-libs linux-vdso.so.1 or linux-gate.so.1
      if (info->dlpi_name && info->dlpi_name[0]
          && strncmp(info->dlpi_name, "linux-vdso.so", 13)
          && strncmp(info->dlpi_name, "linux-gate.so", 13))
         newLibs->emplace_back(info->dlpi_name);
      sKnownLoadedLibBaseAddrs.insert(info->dlpi_addr);
   }
   // No matter what the doc says, return != 0 means "stop the iteration".
   return 0;
}
 
#endif // R__LINUX
 
 
////////////////////////////////////////////////////////////////////////////////
 
void TCling::UpdateListOfLoadedSharedLibraries()
{
#if defined(R__WIN32) || defined(__CYGWIN__)
   HMODULE hModules[1024];
   void *hProcess;
   unsigned long cbModules;
   unsigned int i;
   hProcess = (void *)::GetCurrentProcess();
   ::EnumProcessModules(hProcess, hModules, sizeof(hModules), &cbModules);
   // start at 1 to skip the executable itself
   for (i = 1; i < (cbModules / sizeof(void *)); i++) {
      static const int bufsize = 260;
      wchar_t winname[bufsize];
      char posixname[bufsize];
      ::GetModuleFileNameExW(hProcess, hModules[i], winname, bufsize);
#if defined(__CYGWIN__)
      cygwin_conv_path(CCP_WIN_W_TO_POSIX, winname, posixname, bufsize);
#else
      std::wstring wpath = winname;
      std::replace(wpath.begin(), wpath.end(), '\\', '/');
      string path(wpath.begin(), wpath.end());
      strncpy(posixname, path.c_str(), bufsize);
#endif
      if (!fSharedLibs.Contains(posixname)) {
         RegisterLoadedSharedLibrary(posixname);
      }
   }
#elif defined(R__MACOSX)
   // fPrevLoadedDynLibInfo stores the *next* image index to look at
   uint32_t imageIndex = (uint32_t) (size_t) fPrevLoadedDynLibInfo;
 
   while (const mach_header* mh = _dyld_get_image_header(imageIndex)) {
      // Skip non-dylibs
      if (mh->filetype == MH_DYLIB) {
         if (const char* imageName = _dyld_get_image_name(imageIndex)) {
            RegisterLoadedSharedLibrary(imageName);
         }
      }
 
      ++imageIndex;
   }
   fPrevLoadedDynLibInfo = (void*)(size_t)imageIndex;
#elif defined(R__LINUX)
   // fPrevLoadedDynLibInfo is unused on Linux.
   (void) fPrevLoadedDynLibInfo;
 
   std::vector<std::string> newLibs;
   dl_iterate_phdr(callback_for_dl_iterate_phdr, &newLibs);
   for (auto &&lib: newLibs)
      RegisterLoadedSharedLibrary(lib.c_str());
#else
   Error("TCling::UpdateListOfLoadedSharedLibraries",
         "Platform not supported!");
#endif
}
 
////////////////////////////////////////////////////////////////////////////////
/// Register a new shared library name with the interpreter; add it to
/// fSharedLibs.
 
void TCling::RegisterLoadedSharedLibrary(const char* filename)
{
   // Ignore NULL filenames, aka "the process".
   if (!filename) return;
 
   // Tell the interpreter that this library is available; all libraries can be
   // used to resolve symbols.
   cling::DynamicLibraryManager* DLM = fInterpreter->getDynamicLibraryManager();
   if (!DLM->isLibraryLoaded(filename)) {
      DLM->loadLibrary(filename, true /*permanent*/);
   }
 
#if defined(R__MACOSX)
   // Check that this is not a system library
   auto lenFilename = strlen(filename);
   if (!strncmp(filename, "/usr/lib/system/", 16)
       || !strncmp(filename, "/usr/lib/libc++", 15)
       || !strncmp(filename, "/System/Library/Frameworks/", 27)
       || !strncmp(filename, "/System/Library/PrivateFrameworks/", 34)
       || !strncmp(filename, "/System/Library/CoreServices/", 29)
       || !strcmp(filename, "cl_kernels") // yepp, no directory
       || strstr(filename, "/usr/lib/libSystem")
       || strstr(filename, "/usr/lib/libstdc++")
       || strstr(filename, "/usr/lib/libicucore")
       || strstr(filename, "/usr/lib/libbsm")
       || strstr(filename, "/usr/lib/libobjc")
       || strstr(filename, "/usr/lib/libresolv")
       || strstr(filename, "/usr/lib/libauto")
       || strstr(filename, "/usr/lib/libcups")
       || strstr(filename, "/usr/lib/libDiagnosticMessagesClient")
       || strstr(filename, "/usr/lib/liblangid")
       || strstr(filename, "/usr/lib/libCRFSuite")
       || strstr(filename, "/usr/lib/libpam")
       || strstr(filename, "/usr/lib/libOpenScriptingUtil")
       || strstr(filename, "/usr/lib/libextension")
       || strstr(filename, "/usr/lib/libAudioToolboxUtility")
       || strstr(filename, "/usr/lib/liboah")
       || strstr(filename, "/usr/lib/libRosetta")
       // "cannot link directly with dylib/framework, your binary is not an allowed client of
       // /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/
       // SDKs/MacOSX.sdk/usr/lib/libAudioToolboxUtility.tbd for architecture x86_64
       || (lenFilename > 4 && !strcmp(filename + lenFilename - 4, ".tbd")))
      return;
   TString sFileName(filename);
   R__UpdateLibFileForLinking(sFileName);
   filename = sFileName.Data();
#elif defined(__CYGWIN__)
   // Check that this is not a system library
   static const int bufsize = 260;
   char posixwindir[bufsize];
   char *windir = getenv("WINDIR");
   if (windir)
      cygwin_conv_path(CCP_WIN_A_TO_POSIX, windir, posixwindir, bufsize);
   else
      snprintf(posixwindir, sizeof(posixwindir), "/Windows/");
   if (strstr(filename, posixwindir) ||
       strstr(filename, "/usr/bin/cyg"))
      return;
#elif defined(R__WIN32)
   if (strstr(filename, "/Windows/"))
      return;
#elif defined (R__LINUX)
   if (strstr(filename, "/ld-linux")
       || strstr(filename, "linux-gnu/")
       || strstr(filename, "/libstdc++.")
       || strstr(filename, "/libgcc")
       || strstr(filename, "/libc.")
       || strstr(filename, "/libdl.")
       || strstr(filename, "/libm."))
      return;
#endif
   // Update string of available libraries.
   if (!fSharedLibs.IsNull()) {
      fSharedLibs.Append(" ");
   }
   fSharedLibs.Append(filename);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Load a library file in cling's memory.
/// if 'system' is true, the library is never unloaded.
/// Return 0 on success, -1 on failure.
 
Int_t TCling::Load(const char* filename, Bool_t system)
{
   assert(!IsFromRootCling() && "Trying to load library from rootcling!");
 
   // Used to return 0 on success, 1 on duplicate, -1 on failure, -2 on "fatal".
   R__LOCKGUARD_CLING(gInterpreterMutex);
   cling::DynamicLibraryManager* DLM = fInterpreter->getDynamicLibraryManager();
   std::string canonLib = DLM->lookupLibrary(filename);
   cling::DynamicLibraryManager::LoadLibResult res
      = cling::DynamicLibraryManager::kLoadLibNotFound;
   if (!canonLib.empty()) {
      if (system)
         res = DLM->loadLibrary(filename, system);
      else {
         // For the non system libs, we'd like to be able to unload them.
         // FIXME: Here we lose the information about kLoadLibAlreadyLoaded case.
         cling::Interpreter::CompilationResult compRes;
         HandleInterpreterException(GetMetaProcessorImpl(), Form(".L %s", canonLib.c_str()), compRes, /*cling::Value*/0);
         if (compRes == cling::Interpreter::kSuccess)
            res = cling::DynamicLibraryManager::kLoadLibSuccess;
      }
   }
 
   if (res == cling::DynamicLibraryManager::kLoadLibSuccess) {
      UpdateListOfLoadedSharedLibraries();
   }
   switch (res) {
   case cling::DynamicLibraryManager::kLoadLibSuccess: return 0;
   case cling::DynamicLibraryManager::kLoadLibAlreadyLoaded:  return 1;
   default: break;
   };
   return -1;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Load a macro file in cling's memory.
 
void TCling::LoadMacro(const char* filename, EErrorCode* error)
{
   ProcessLine(Form(".L %s", filename), error);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Let cling process a command line asynch.
 
Long_t TCling::ProcessLineAsynch(const char* line, EErrorCode* error)
{
   return ProcessLine(line, error);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Let cling process a command line synchronously, i.e we are waiting
/// it will be finished.
 
Long_t TCling::ProcessLineSynch(const char* line, EErrorCode* error)
{
   R__LOCKGUARD_CLING(fLockProcessLine ? gInterpreterMutex : 0);
   if (gApplication) {
      if (gApplication->IsCmdThread()) {
         return ProcessLine(line, error);
      }
      return 0;
   }
   return ProcessLine(line, error);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Directly execute an executable statement (e.g. "func()", "3+5", etc.
/// however not declarations, like "Int_t x;").
 
Long_t TCling::Calc(const char* line, EErrorCode* error)
{
#ifdef R__WIN32
   // Test on ApplicationImp not being 0 is needed because only at end of
   // TApplication ctor the IsLineProcessing flag is set to 0, so before
   // we can not use it.
   if (gApplication && gApplication->GetApplicationImp()) {
      while (gROOT->IsLineProcessing() && !gApplication) {
         Warning("Calc", "waiting for cling thread to free");
         gSystem->Sleep(500);
      }
      gROOT->SetLineIsProcessing();
   }
#endif // R__WIN32
   R__LOCKGUARD_CLING(gInterpreterMutex);
   if (error) {
      *error = TInterpreter::kNoError;
   }
   cling::Value valRef;
   cling::Interpreter::CompilationResult cr = fInterpreter->evaluate(line, valRef);
   if (cr != cling::Interpreter::kSuccess) {
      // Failure in compilation.
      if (error) {
         // Note: Yes these codes are weird.
         *error = TInterpreter::kRecoverable;
      }
      return 0L;
   }
   if (!valRef.isValid()) {
      // Failure at runtime.
      if (error) {
         // Note: Yes these codes are weird.
         *error = TInterpreter::kDangerous;
      }
      return 0L;
   }
 
   if (valRef.isVoid()) {
      return 0;
   }
 
   RegisterTemporary(valRef);
#ifdef R__WIN32
   if (gApplication && gApplication->GetApplicationImp()) {
      gROOT->SetLineHasBeenProcessed();
   }
#endif // R__WIN32
   return valRef.simplisticCastAs<long>();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set a getline function to call when input is needed.
 
void TCling::SetGetline(const char * (*getlineFunc)(const char* prompt),
                                void (*histaddFunc)(const char* line))
{
   // If cling offers a replacement for G__pause(), it would need to
   // also offer a way to customize at least the history recording.
 
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   Warning("SetGetline","Cling should support the equivalent of SetGetlineFunc(getlineFunc, histaddFunc)");
#endif
#endif
}
 
////////////////////////////////////////////////////////////////////////////////
/// Helper function to increase the internal Cling count of transactions
/// that change the AST.
 
Bool_t TCling::HandleNewTransaction(const cling::Transaction &T)
{
   R__LOCKGUARD(gInterpreterMutex);
 
   if ((std::distance(T.decls_begin(), T.decls_end()) != 1)
      || T.deserialized_decls_begin() != T.deserialized_decls_end()
      || T.macros_begin() != T.macros_end()
      || ((!T.getFirstDecl().isNull()) && ((*T.getFirstDecl().begin()) != T.getWrapperFD()))) {
      fTransactionCount++;
      return true;
   }
   return false;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete object from cling symbol table so it can not be used anymore.
/// cling objects are always on the heap.
 
void TCling::RecursiveRemove(TObject* obj)
{
   // NOTE: When replacing the mutex by a ReadWrite mutex, we **must**
   // put in place the Read/Write part here.  Keeping the write lock
   // here is 'catasptrophic' for scaling as it means that ALL calls
   // to RecursiveRemove will take the write lock and performance
   // of many threads trying to access the write lock at the same
   // time is relatively bad.
   R__READ_LOCKGUARD(ROOT::gCoreMutex);
   // Note that fgSetOfSpecials is supposed to be updated by TClingCallbacks::tryFindROOTSpecialInternal
   // (but isn't at the moment).
   if (obj->IsOnHeap() && fgSetOfSpecials && !((std::set<TObject*>*)fgSetOfSpecials)->empty()) {
      std::set<TObject*>::iterator iSpecial = ((std::set<TObject*>*)fgSetOfSpecials)->find(obj);
      if (iSpecial != ((std::set<TObject*>*)fgSetOfSpecials)->end()) {
         R__WRITE_LOCKGUARD(ROOT::gCoreMutex);
         DeleteGlobal(obj);
         ((std::set<TObject*>*)fgSetOfSpecials)->erase(iSpecial);
      }
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Pressing Ctrl+C should forward here. In the case where we have had
/// continuation requested we must reset it.
 
void TCling::Reset()
{
   fMetaProcessor->cancelContinuation();
   // Reset the Cling state to the state saved by the last call to
   // TCling::SaveContext().
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   R__LOCKGUARD(gInterpreterMutex);
   Warning("Reset","Cling should support the equivalent of scratch_upto(&fDictPos)");
#endif
#endif
}
 
////////////////////////////////////////////////////////////////////////////////
/// Reset the Cling state to its initial state.
 
void TCling::ResetAll()
{
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   R__LOCKGUARD(gInterpreterMutex);
   Warning("ResetAll","Cling should support the equivalent of complete reset (unload everything but the startup decls.");
#endif
#endif
}
 
////////////////////////////////////////////////////////////////////////////////
/// Reset in Cling the list of global variables to the state saved by the last
/// call to TCling::SaveGlobalsContext().
///
/// Note: Right now, all we do is run the global destructors.
 
void TCling::ResetGlobals()
{
   R__LOCKGUARD(gInterpreterMutex);
   // TODO:
   // Here we should iterate over the transactions (N-3) and revert.
   // N-3 because the first three internal to cling.
 
   fInterpreter->runAndRemoveStaticDestructors();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Reset the Cling 'user' global objects/variables state to the state saved by the last
/// call to TCling::SaveGlobalsContext().
 
void TCling::ResetGlobalVar(void* obj)
{
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   R__LOCKGUARD(gInterpreterMutex);
   Warning("ResetGlobalVar","Cling should support the equivalent of resetglobalvar(obj)");
#endif
#endif
}
 
////////////////////////////////////////////////////////////////////////////////
/// Rewind Cling dictionary to the point where it was before executing
/// the current macro. This function is typically called after SEGV or
/// ctlr-C after doing a longjmp back to the prompt.
 
void TCling::RewindDictionary()
{
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   R__LOCKGUARD(gInterpreterMutex);
   Warning("RewindDictionary","Cling should provide a way to revert transaction similar to rewinddictionary()");
#endif
#endif
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete obj from Cling symbol table so it cannot be accessed anymore.
/// Returns 1 in case of success and 0 in case object was not in table.
 
Int_t TCling::DeleteGlobal(void* obj)
{
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   R__LOCKGUARD(gInterpreterMutex);
   Warning("DeleteGlobal","Cling should provide the equivalent of deleteglobal(obj), see also DeleteVariable.");
#endif
#endif
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Undeclare obj called name.
/// Returns 1 in case of success, 0 for failure.
 
Int_t TCling::DeleteVariable(const char* name)
{
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   Warning("DeleteVariable","should do more that just reseting the value to zero");
#endif
#endif
 
   R__LOCKGUARD(gInterpreterMutex);
   llvm::StringRef srName(name);
   const char* unscopedName = name;
   llvm::StringRef::size_type posScope = srName.rfind("::");
   const clang::DeclContext* declCtx = 0;
   if (posScope != llvm::StringRef::npos) {
      const cling::LookupHelper& lh = fInterpreter->getLookupHelper();
      const clang::Decl* scopeDecl
         = lh.findScope(srName.substr(0, posScope),
                        cling::LookupHelper::WithDiagnostics);
      if (!scopeDecl) {
         Error("DeleteVariable", "Cannot find enclosing scope for variable %s",
               name);
         return 0;
      }
      declCtx = llvm::dyn_cast<clang::DeclContext>(scopeDecl);
      if (!declCtx) {
         Error("DeleteVariable",
               "Enclosing scope for variable %s is not a declaration context",
               name);
         return 0;
      }
      unscopedName += posScope + 2;
   }
   // Could trigger deserialization of decls.
   cling::Interpreter::PushTransactionRAII RAII(GetInterpreterImpl());
   clang::NamedDecl* nVarDecl
      = cling::utils::Lookup::Named(&fInterpreter->getSema(), unscopedName, declCtx);
   if (!nVarDecl) {
      Error("DeleteVariable", "Unknown variable %s", name);
      return 0;
   }
   clang::VarDecl* varDecl = llvm::dyn_cast<clang::VarDecl>(nVarDecl);
   if (!varDecl) {
      Error("DeleteVariable", "Entity %s is not a variable", name);
      return 0;
   }
 
   clang::QualType qType = varDecl->getType();
   const clang::Type* type = qType->getUnqualifiedDesugaredType();
   // Cannot set a reference's address to nullptr; the JIT can place it
   // into read-only memory (ROOT-7100).
   if (type->isPointerType()) {
      int** ppInt = (int**)fInterpreter->getAddressOfGlobal(GlobalDecl(varDecl));
      // set pointer to invalid.
      if (ppInt) *ppInt = 0;
   }
   return 1;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save the current Cling state.
 
void TCling::SaveContext()
{
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   R__LOCKGUARD(gInterpreterMutex);
   Warning("SaveContext","Cling should provide a way to record a state watermark similar to store_dictposition(&fDictPos)");
#endif
#endif
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save the current Cling state of global objects.
 
void TCling::SaveGlobalsContext()
{
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,2)
   R__LOCKGUARD(gInterpreterMutex);
   Warning("SaveGlobalsContext","Cling should provide a way to record a watermark for the list of global variable similar to store_dictposition(&fDictPosGlobals)");
#endif
#endif
}
 
////////////////////////////////////////////////////////////////////////////////
/// No op: see TClingCallbacks (used to update the list of globals)
 
void TCling::UpdateListOfGlobals()
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// No op: see TClingCallbacks (used to update the list of global functions)
 
void TCling::UpdateListOfGlobalFunctions()
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// No op: see TClingCallbacks (used to update the list of types)
 
void TCling::UpdateListOfTypes()
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Check in what order the member of a tuple are layout.
enum class ETupleOrdering {
   kAscending,
   kDescending,
   kUnexpected
};
 
struct AlternateTupleIntDoubleAsc
{
   Int_t    _0;
   Double_t _1;
};
 
struct AlternateTupleIntDoubleDes
{
   Double_t _1;
   Int_t    _0;
};
 
static ETupleOrdering IsTupleAscending()
{
   std::tuple<int,double> value;
   AlternateTupleIntDoubleAsc asc;
   AlternateTupleIntDoubleDes des;
 
   size_t offset0 = ((char*)&(std::get<0>(value))) - ((char*)&value);
   size_t offset1 = ((char*)&(std::get<1>(value))) - ((char*)&value);
 
   size_t ascOffset0 = ((char*)&(asc._0)) - ((char*)&asc);
   size_t ascOffset1 = ((char*)&(asc._1)) - ((char*)&asc);
 
   size_t desOffset0 = ((char*)&(des._0)) - ((char*)&des);
   size_t desOffset1 = ((char*)&(des._1)) - ((char*)&des);
 
   if (offset0 == ascOffset0 && offset1 == ascOffset1) {
      return ETupleOrdering::kAscending;
   } else if (offset0 == desOffset0 && offset1 == desOffset1) {
      return ETupleOrdering::kDescending;
   } else {
      return ETupleOrdering::kUnexpected;
   }
}
 
static std::string AlternateTuple(const char *classname, const cling::LookupHelper& lh)
{
   TClassEdit::TSplitType tupleContent(classname);
   std::string alternateName = "TEmulatedTuple";
   alternateName.append( classname + 5 );
 
   std::string fullname = "ROOT::Internal::" + alternateName;
   if (lh.findScope(fullname, cling::LookupHelper::NoDiagnostics,
                    /*resultType*/nullptr, /* intantiateTemplate= */ false))
      return fullname;
 
   std::string guard_name;
   ROOT::TMetaUtils::GetCppName(guard_name,alternateName.c_str());
   std::ostringstream guard;
   guard << "ROOT_INTERNAL_TEmulated_";
   guard << guard_name;
 
   std::ostringstream alternateTuple;
   alternateTuple << "#ifndef " << guard.str() << "\n";
   alternateTuple << "#define " << guard.str() << "\n";
   alternateTuple << "namespace ROOT { namespace Internal {\n";
   alternateTuple << "template <class... Types> struct TEmulatedTuple;\n";
   alternateTuple << "template <> struct " << alternateName << " {\n";
 
   // This could also be a compile time choice ...
   switch(IsTupleAscending()) {
      case ETupleOrdering::kAscending: {
         unsigned int nMember = 0;
         auto iter = tupleContent.fElements.begin() + 1; // Skip the template name (tuple)
         auto theEnd = tupleContent.fElements.end() - 1; // skip the 'stars'.
         while (iter != theEnd) {
            alternateTuple << "   " << *iter << " _" << nMember << ";\n";
            ++iter;
            ++nMember;
         }
         break;
      }
      case ETupleOrdering::kDescending: {
         unsigned int nMember = tupleContent.fElements.size() - 3;
         auto iter = tupleContent.fElements.rbegin() + 1; // Skip the template name (tuple)
         auto theEnd = tupleContent.fElements.rend() - 1; // skip the 'stars'.
         while (iter != theEnd) {
            alternateTuple << "   " << *iter << " _" << nMember << ";\n";
            ++iter;
            --nMember;
         }
         break;
      }
      case ETupleOrdering::kUnexpected: {
         Fatal("TCling::SetClassInfo::AlternateTuple",
               "Layout of std::tuple on this platform is unexpected.");
         break;
      }
   }
 
   alternateTuple << "};\n";
   alternateTuple << "}}\n";
   alternateTuple << "#endif\n";
   if (!gCling->Declare(alternateTuple.str().c_str())) {
      Error("Load","Could not declare %s",alternateName.c_str());
      return "";
   }
   alternateName = "ROOT::Internal::" + alternateName;
   return alternateName;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set pointer to the TClingClassInfo in TClass.
/// If 'reload' is true, (attempt to) generate a new ClassInfo even if we
/// already have one.
 
void TCling::SetClassInfo(TClass* cl, Bool_t reload)
{
   // We are shutting down, there is no point in reloading, it only triggers
   // redundant deserializations.
   if (fIsShuttingDown) {
      // Remove the decl_id from the DeclIdToTClass map
      if (cl->fClassInfo) {
         R__LOCKGUARD(gInterpreterMutex);
         TClingClassInfo* TClinginfo = (TClingClassInfo*) cl->fClassInfo;
         // Test again as another thread may have set fClassInfo to nullptr.
         if (TClinginfo) {
            TClass::RemoveClassDeclId(TClinginfo->GetDeclId());
         }
         delete TClinginfo;
         cl->fClassInfo = nullptr;
      }
      return;
   }
 
   R__LOCKGUARD(gInterpreterMutex);
   if (cl->fClassInfo && !reload) {
      return;
   }
   //Remove the decl_id from the DeclIdToTClass map
   TClingClassInfo* TClinginfo = (TClingClassInfo*) cl->fClassInfo;
   if (TClinginfo) {
      TClass::RemoveClassDeclId(TClinginfo->GetDeclId());
   }
   delete TClinginfo;
   cl->fClassInfo = 0;
   std::string name(cl->GetName());
 
   // Handle the special case of 'tuple' where we ignore the real implementation
   // details and just overlay a 'simpler'/'simplistic' version that is easy
   // for the I/O to understand and handle.
   if (strncmp(cl->GetName(),"tuple<",strlen("tuple<"))==0) {
 
      name = AlternateTuple(cl->GetName(), fInterpreter->getLookupHelper());
 
   }
 
   bool instantiateTemplate = !cl->TestBit(TClass::kUnloading);
   // FIXME: Rather than adding an option to the TClingClassInfo, we should consider combining code 
   // that is currently in the caller (like SetUnloaded) that disable AutoLoading and AutoParsing and
   // code is in the callee (disabling template instantiation) and end up with a more explicit class:
   //      TClingClassInfoReadOnly.
   TClingClassInfo* info = new TClingClassInfo(GetInterpreterImpl(), name.c_str(), instantiateTemplate);
   if (!info->IsValid()) {
      if (cl->fState != TClass::kHasTClassInit) {
         if (cl->fStreamerInfo->GetEntries() != 0) {
            cl->fState = TClass::kEmulated;
         } else {
            cl->fState = TClass::kForwardDeclared;
         }
      }
      delete info;
      return;
   }
   cl->fClassInfo = (ClassInfo_t*)info; // Note: We are transferring ownership here.
   // In case a class contains an external enum, the enum will be seen as a
   // class. We must detect this special case and make the class a Zombie.
   // Here we assume that a class has at least one method.
   // We can NOT call TClass::Property from here, because this method
   // assumes that the TClass is well formed to do a lot of information
   // caching. The method SetClassInfo (i.e. here) is usually called during
   // the building phase of the TClass, hence it is NOT well formed yet.
   Bool_t zombieCandidate = kFALSE;
   if (
      info->IsValid() &&
      !(info->Property() & (kIsClass | kIsStruct | kIsNamespace))
   ) {
      zombieCandidate = kTRUE;
   }
   if (!info->IsLoaded()) {
      if (info->Property() & (kIsNamespace)) {
         // Namespaces can have info but no corresponding CINT dictionary
         // because they are auto-created if one of their contained
         // classes has a dictionary.
         zombieCandidate = kTRUE;
      }
      // this happens when no dictionary is available
      delete info;
      cl->fClassInfo = 0;
   }
   if (zombieCandidate && !cl->GetCollectionType()) {
      cl->MakeZombie();
   }
   // If we reach here, the info was valid (See early returns).
   if (cl->fState != TClass::kHasTClassInit) {
      if (cl->fClassInfo) {
         cl->fState = TClass::kInterpreted;
         cl->ResetBit(TClass::kIsEmulation);
      } else {
//         if (TClassEdit::IsSTLCont(cl->GetName()) {
//            There will be an emulated collection proxy, is that the same?
//            cl->fState = TClass::kEmulated;
//         } else {
         if (cl->fStreamerInfo->GetEntries() != 0) {
            cl->fState = TClass::kEmulated;
         } else {
            cl->fState = TClass::kForwardDeclared;
         }
//         }
      }
   }
   if (cl->fClassInfo) {
      TClass::AddClassToDeclIdMap(((TClingClassInfo*)cl->fClassInfo)->GetDeclId(), cl);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Checks if an entity with the specified name is defined in Cling.
/// Returns kUnknown if the entity is not defined.
/// Returns kWithClassDefInline if the entity exists and has a ClassDefInline
/// Returns kKnown if the entity is defined.
///
/// By default, structs, namespaces, classes, enums and unions are looked for.
/// If the flag isClassOrNamespaceOnly is true, classes, structs and
/// namespaces only are considered. I.e. if the name is an enum or a union,
/// the returned value is false.
///
/// In the case where the class is not loaded and belongs to a namespace
/// or is nested, looking for the full class name is outputting a lots of
/// (expected) error messages.  Currently the only way to avoid this is to
/// specifically check that each level of nesting is already loaded.
/// In case of templates the idea is that everything between the outer
/// '<' and '>' has to be skipped, e.g.: aap<pippo<noot>::klaas>::a_class
 
TInterpreter::ECheckClassInfo
TCling::CheckClassInfo(const char *name, Bool_t autoload, Bool_t isClassOrNamespaceOnly /* = kFALSE*/)
{
   R__LOCKGUARD(gInterpreterMutex);
   static const char *anonEnum = "anonymous enum ";
   static const int cmplen = strlen(anonEnum);
 
   if (fIsShuttingDown || 0 == strncmp(name, anonEnum, cmplen)) {
      return kUnknown;
   }
 
   // Do not turn on the AutoLoading if it is globally off.
   autoload = autoload && IsClassAutoLoadingEnabled();
 
   // Avoid the double search below in case the name is a fundamental type
   // or typedef to a fundamental type.
   THashTable *typeTable = dynamic_cast<THashTable*>( gROOT->GetListOfTypes() );
   TDataType *fundType = (TDataType *)typeTable->THashTable::FindObject( name );
 
   if (fundType && fundType->GetType() < TVirtualStreamerInfo::kObject
       && fundType->GetType() > 0) {
      // Fundamental type, no a class.
      return kUnknown;
   }
 
   // Migrated from within TClass::GetClass
   // If we want to know if a class or a namespace with this name exists in the
   // interpreter and this is an enum in the type system, before or after loading
   // according to the autoload function argument, return kUnknown.
   if (isClassOrNamespaceOnly && TEnum::GetEnum(name, autoload ? TEnum::kAutoload : TEnum::kNone))
      return kUnknown;
 
   const char *classname = name;
 
   // RAII to suspend and restore auto-loading and auto-parsing based on some external conditions.
   class MaybeSuspendAutoLoadParse {
      int fStoreAutoLoad = 0;
      int fStoreAutoParse = 0;
      bool fSuspendedAutoParse = false;
   public:
      MaybeSuspendAutoLoadParse(int autoload) {
         fStoreAutoLoad = ((TCling*)gCling)->SetClassAutoLoading(autoload);
      }
 
      void SuspendAutoParsing() {
         fSuspendedAutoParse = true;
         fStoreAutoParse = ((TCling*)gCling)->SetSuspendAutoParsing(true);
      }
 
      ~~MaybeSuspendAutoLoadParse() {
         if (fSuspendedAutoParse)
            ((TCling*)gCling)->SetSuspendAutoParsing(fStoreAutoParse);
         ((TCling*)gCling)->SetClassAutoLoading(fStoreAutoLoad);
      }
   };
 
   MaybeSuspendAutoLoadParse autoLoadParseRAII( autoload );
   if (TClassEdit::IsStdPair(classname) || TClassEdit::IsStdPairBase(classname))
      autoLoadParseRAII.SuspendAutoParsing();
 
   // First we want to check whether the decl exist, but _without_
   // generating any template instantiation. However, the lookup
   // still will create a forward declaration of the class template instance
   // if it exist.  In this case, the return value of findScope will still
   // be zero but the type will be initialized.
   // Note in the corresponding code in ROOT 5, CINT was not instantiating
   // this forward declaration.
   const cling::LookupHelper& lh = fInterpreter->getLookupHelper();
   const clang::Type *type = 0;
   const clang::Decl *decl
      = lh.findScope(classname,
                     gDebug > 5 ? cling::LookupHelper::WithDiagnostics
                     : cling::LookupHelper::NoDiagnostics,
                     &type, /* intantiateTemplate= */ false );
   if (!decl) {
      std::string buf = TClassEdit::InsertStd(classname);
      decl = lh.findScope(buf,
                          gDebug > 5 ? cling::LookupHelper::WithDiagnostics
                          : cling::LookupHelper::NoDiagnostics,
                          &type,false);
   }
 
   if (type) {
      // If decl==0 and the type is valid, then we have a forward declaration.
      if (!decl) {
         // If we have a forward declaration for a class template instantiation,
         // we want to ignore it if it was produced/induced by the call to
         // findScope, however we can not distinguish those from the
         // instantiation induce by 'soft' use (and thus also induce by the
         // same underlying code paths)
         // ['soft' use = use not requiring a complete definition]
         // So to reduce the amount of disruption to the existing code we
         // would just ignore those for STL collection, for which we really
         // need to have the compiled collection proxy (and thus the TClass
         // bootstrap).
         clang::ClassTemplateSpecializationDecl *tmpltDecl =
            llvm::dyn_cast_or_null<clang::ClassTemplateSpecializationDecl>
               (type->getAsCXXRecordDecl());
         if (tmpltDecl && !tmpltDecl->getPointOfInstantiation().isValid()) {
            // Since the point of instantiation is invalid, we 'guess' that
            // the 'instantiation' of the forwarded type appended in
            // findscope.
            if (ROOT::TMetaUtils::IsSTLCont(*tmpltDecl)) {
               // For STL Collection we return kUnknown.
               return kUnknown;
            }
         }
      }
      TClingClassInfo tci(GetInterpreterImpl(), *type);
      if (!tci.IsValid()) {
         return kUnknown;
      }
      auto propertiesMask = isClassOrNamespaceOnly ? kIsClass | kIsStruct | kIsNamespace :
                                                     kIsClass | kIsStruct | kIsNamespace | kIsEnum | kIsUnion;
 
      if (tci.Property() & propertiesMask) {
         bool hasClassDefInline = false;
         if (isClassOrNamespaceOnly) {
            // We do not need to check for ClassDefInline when this is called from
            // TClass::Init, we only do it for the call from TClass::GetClass.
            auto hasDictionary = tci.GetMethod("Dictionary", "", false, 0, ROOT::kExactMatch);
            auto implLineFunc = tci.GetMethod("ImplFileLine", "", false, 0, ROOT::kExactMatch);
 
            if (hasDictionary.IsValid() && implLineFunc.IsValid()) {
               int lineNumber = 0;
               bool success = false;
               std::tie(success, lineNumber) =
                  ROOT::TMetaUtils::GetTrivialIntegralReturnValue(implLineFunc.GetAsFunctionDecl(), *fInterpreter);
               hasClassDefInline = success && (lineNumber == -1);
            }
         }
 
         // fprintf(stderr,"CheckClassInfo: %s had dict=%d  inline=%d\n",name,hasDictionary.IsValid()
         // , hasClassDefInline);
 
         // We are now sure that the entry is not in fact an autoload entry.
         if (hasClassDefInline)
            return kWithClassDefInline;
         else
            return kKnown;
      } else {
         // We are now sure that the entry is not in fact an autoload entry.
         return kUnknown;
      }
   }
 
   if (decl)
      return kKnown;
   else
      return kUnknown;
 
   // Setting up iterator part of TClingTypedefInfo is too slow.
   // Copy the lookup code instead:
   /*
   TClingTypedefInfo t(fInterpreter, name);
   if (t.IsValid() && !(t.Property() & kIsFundamental)) {
      delete[] classname;
      return kTRUE;
   }
   */
 
//   const clang::Decl *decl = lh.findScope(name);
//   if (!decl) {
//      std::string buf = TClassEdit::InsertStd(name);
//      decl = lh.findScope(buf);
//   }
 
//   return (decl);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return true if there is a class template by the given name ...
 
Bool_t TCling::CheckClassTemplate(const char *name)
{
   const cling::LookupHelper& lh = fInterpreter->getLookupHelper();
   const clang::Decl *decl
      = lh.findClassTemplate(name,
                             gDebug > 5 ? cling::LookupHelper::WithDiagnostics
                             : cling::LookupHelper::NoDiagnostics);
   if (!decl) {
      std::string strname = "std::";
      strname += name;
      decl = lh.findClassTemplate(strname,
                                  gDebug > 5 ? cling::LookupHelper::WithDiagnostics
                                  : cling::LookupHelper::NoDiagnostics);
   }
   return 0 != decl;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create list of pointers to base class(es) for TClass cl.
 
void TCling::CreateListOfBaseClasses(TClass *cl) const
{
   R__LOCKGUARD(gInterpreterMutex);
   if (cl->fBase) {
      return;
   }
   TClingClassInfo *tci = (TClingClassInfo *)cl->GetClassInfo();
   if (!tci) return;
   TClingBaseClassInfo t(GetInterpreterImpl(), tci);
   TList *listOfBase = new TList;
   while (t.Next()) {
      // if name cannot be obtained no use to put in list
      if (t.IsValid() && t.Name()) {
         TClingBaseClassInfo *a = new TClingBaseClassInfo(t);
         listOfBase->Add(new TBaseClass((BaseClassInfo_t *)a, cl));
      }
   }
   // Now that is complete, publish it.
   cl->fBase = listOfBase;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create list of pointers to enums for TClass cl.
 
void TCling::LoadEnums(TListOfEnums& enumList) const
{
   R__LOCKGUARD(gInterpreterMutex);
 
   const Decl * D;
   TClass* cl = enumList.GetClass();
   if (cl) {
      D = ((TClingClassInfo*)cl->GetClassInfo())->GetDecl();
   }
   else {
      D = fInterpreter->getCI()->getASTContext().getTranslationUnitDecl();
   }
   // Iterate on the decl of the class and get the enums.
   if (const clang::DeclContext* DC = dyn_cast<clang::DeclContext>(D)) {
      cling::Interpreter::PushTransactionRAII deserRAII(GetInterpreterImpl());
      // Collect all contexts of the namespace.
      llvm::SmallVector< DeclContext *, 4> allDeclContexts;
      const_cast< clang::DeclContext *>(DC)->collectAllContexts(allDeclContexts);
      for (llvm::SmallVector<DeclContext*, 4>::iterator declIter = allDeclContexts.begin(), declEnd = allDeclContexts.end();
           declIter != declEnd; ++declIter) {
         // Iterate on all decls for each context.
         for (clang::DeclContext::decl_iterator DI = (*declIter)->decls_begin(),
              DE = (*declIter)->decls_end(); DI != DE; ++DI) {
            if (const clang::EnumDecl* ED = dyn_cast<clang::EnumDecl>(*DI)) {
               // Get name of the enum type.
               std::string buf;
               PrintingPolicy Policy(ED->getASTContext().getPrintingPolicy());
               llvm::raw_string_ostream stream(buf);
               // Don't trigger fopen of the source file to count lines:
               Policy.AnonymousTagLocations = false;
               ED->getNameForDiagnostic(stream, Policy, /*Qualified=*/false);
               stream.flush();
               // If the enum is unnamed we do not add it to the list of enums i.e unusable.
               if (!buf.empty()) {
                  const char* name = buf.c_str();
                  // Add the enum to the list of loaded enums.
                  enumList.Get(ED, name);
               }
            }
         }
      }
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create list of pointers to function templates for TClass cl.
 
void TCling::LoadFunctionTemplates(TClass* cl) const
{
   R__LOCKGUARD(gInterpreterMutex);
 
   const Decl * D;
   TListOfFunctionTemplates* funcTempList;
   if (cl) {
      D = ((TClingClassInfo*)cl->GetClassInfo())->GetDecl();
      funcTempList = (TListOfFunctionTemplates*)cl->GetListOfFunctionTemplates(false);
   }
   else {
      D = fInterpreter->getCI()->getASTContext().getTranslationUnitDecl();
      funcTempList = (TListOfFunctionTemplates*)gROOT->GetListOfFunctionTemplates();
   }
   // Iterate on the decl of the class and get the enums.
   if (const clang::DeclContext* DC = dyn_cast<clang::DeclContext>(D)) {
      cling::Interpreter::PushTransactionRAII deserRAII(GetInterpreterImpl());
      // Collect all contexts of the namespace.
      llvm::SmallVector< DeclContext *, 4> allDeclContexts;
      const_cast< clang::DeclContext *>(DC)->collectAllContexts(allDeclContexts);
      for (llvm::SmallVector<DeclContext*, 4>::iterator declIter = allDeclContexts.begin(),
           declEnd = allDeclContexts.end(); declIter != declEnd; ++declIter) {
         // Iterate on all decls for each context.
         for (clang::DeclContext::decl_iterator DI = (*declIter)->decls_begin(),
              DE = (*declIter)->decls_end(); DI != DE; ++DI) {
            if (const clang::FunctionTemplateDecl* FTD = dyn_cast<clang::FunctionTemplateDecl>(*DI)) {
                  funcTempList->Get(FTD);
            }
         }
      }
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Get the scopes representing using declarations of namespace
 
std::vector<std::string> TCling::GetUsingNamespaces(ClassInfo_t *cl) const
{
   TClingClassInfo *ci = (TClingClassInfo*)cl;
   return ci->GetUsingNamespaces();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create list of pointers to data members for TClass cl.
/// This is now a nop.  The creation and updating is handled in
/// TListOfDataMembers.
 
void TCling::CreateListOfDataMembers(TClass* cl) const
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create list of pointers to methods for TClass cl.
/// This is now a nop.  The creation and updating is handled in
/// TListOfFunctions.
 
void TCling::CreateListOfMethods(TClass* cl) const
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Update the list of pointers to method for TClass cl
/// This is now a nop.  The creation and updating is handled in
/// TListOfFunctions.
 
void TCling::UpdateListOfMethods(TClass* cl) const
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Update the list of pointers to data members for TClass cl
/// This is now a nop.  The creation and updating is handled in
/// TListOfDataMembers.
 
void TCling::UpdateListOfDataMembers(TClass* cl) const
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create list of pointers to method arguments for TMethod m.
 
void TCling::CreateListOfMethodArgs(TFunction* m) const
{
   R__LOCKGUARD(gInterpreterMutex);
   if (m->fMethodArgs) {
      return;
   }
   TList *arglist = new TList;
   TClingMethodArgInfo t(GetInterpreterImpl(), (TClingMethodInfo*)m->fInfo);
   while (t.Next()) {
      if (t.IsValid()) {
         TClingMethodArgInfo* a = new TClingMethodArgInfo(t);
         arglist->Add(new TMethodArg((MethodArgInfo_t*)a, m));
      }
   }
   m->fMethodArgs = arglist;
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Generate a TClass for the given class.
/// Since the caller has already check the ClassInfo, let it give use the
/// result (via the value of emulation) rather than recalculate it.
 
TClass *TCling::GenerateTClass(const char *classname, Bool_t emulation, Bool_t silent /* = kFALSE */)
{
// For now the following line would lead to the (unwanted) instantiation
// of class template.  This could/would need to be resurrected only if
// we re-introduce so sort of automatic instantiation.   However this would
// have to include carefull look at the template parameter to avoid
// creating instance we can not really use (if the parameter are only forward
// declaration or do not have all the necessary interfaces).
 
   //   TClingClassInfo tci(fInterpreter, classname);
   //   if (1 || !tci.IsValid()) {
 
   Version_t version = 1;
   if (TClassEdit::IsSTLCont(classname)) {
      version = TClass::GetClass("TVirtualStreamerInfo")->GetClassVersion();
   }
   R__LOCKGUARD(gInterpreterMutex);
   TClass *cl = new TClass(classname, version, silent);
   if (emulation) {
      cl->SetBit(TClass::kIsEmulation);
   } else {
      // Set the class version if the class is versioned.
      // Note that we cannot just call CLASS::Class_Version() as we might not have
      // an execution engine (when invoked from rootcling).
 
      // Do not call cl->GetClassVersion(), it has side effects!
      Version_t oldvers = cl->fClassVersion;
      if (oldvers == version && cl->GetClassInfo()) {
         // We have a version and it might need an update.
         Version_t newvers = oldvers;
         TClingClassInfo* cli = (TClingClassInfo*)cl->GetClassInfo();
         if (llvm::isa<clang::NamespaceDecl>(cli->GetDecl())) {
            // Namespaces don't have class versions.
            return cl;
         }
         TClingMethodInfo mi = cli->GetMethod("Class_Version", "", 0 /*poffset*/,
                                              ROOT::kExactMatch,
                                              TClingClassInfo::kInThisScope);
         if (!mi.IsValid()) {
            if (cl->TestBit(TClass::kIsTObject)) {
               Error("GenerateTClass",
                     "Cannot find %s::Class_Version()! Class version might be wrong.",
                     cl->GetName());
            }
            return cl;
         }
         newvers = ROOT::TMetaUtils::GetClassVersion(llvm::dyn_cast<clang::RecordDecl>(cli->GetDecl()),
                                                     *fInterpreter);
         if (newvers == -1) {
            // Didn't manage to determine the class version from the AST.
            // Use runtime instead.
            if ((mi.Property() & kIsStatic)
                && !fInterpreter->isInSyntaxOnlyMode()) {
               // This better be a static function.
               TClingCallFunc callfunc(GetInterpreterImpl(), *fNormalizedCtxt);
               callfunc.SetFunc(&mi);
               newvers = callfunc.ExecInt(0);
            } else {
               Error("GenerateTClass",
                     "Cannot invoke %s::Class_Version()! Class version might be wrong.",
                     cl->GetName());
            }
         }
         if (newvers != oldvers) {
            cl->fClassVersion = newvers;
            cl->fStreamerInfo->Expand(newvers + 2 + 10);
         }
      }
   }
 
   return cl;
 
//   } else {
//      return GenerateTClass(&tci,silent);
//   }
}
 
#if 0
////////////////////////////////////////////////////////////////////////////////
 
static void GenerateTClass_GatherInnerIncludes(cling::Interpreter *interp, TString &includes,TClingClassInfo *info)
{
   includes += info->FileName();
 
   const clang::ClassTemplateSpecializationDecl *templateCl
      = llvm::dyn_cast<clang::ClassTemplateSpecializationDecl>(info->GetDecl());
   if (templateCl) {
      for(unsigned int i=0; i <  templateCl->getTemplateArgs().size(); ++i) {
          const clang::TemplateArgument &arg( templateCl->getTemplateArgs().get(i) );
          if (arg.getKind() == clang::TemplateArgument::Type) {
             const clang::Type *uType = ROOT::TMetaUtils::GetUnderlyingType( arg.getAsType() );
 
            if (!uType->isFundamentalType() && !uType->isEnumeralType()) {
               // We really need a header file.
               const clang::CXXRecordDecl *argdecl = uType->getAsCXXRecordDecl();
               if (argdecl) {
                  includes += ";";
                  TClingClassInfo subinfo(interp,*(argdecl->getASTContext().getRecordType(argdecl).getTypePtr()));
                  GenerateTClass_GatherInnerIncludes(interp, includes, &subinfo);
               } else {
                  std::string Result;
                  llvm::raw_string_ostream OS(Result);
                  arg.print(argdecl->getASTContext().getPrintingPolicy(),OS);
                  Warning("TCling::GenerateTClass","Missing header file for %s",OS.str().c_str());
               }
            }
          }
      }
   }
}
#endif
 
////////////////////////////////////////////////////////////////////////////////
/// Generate a TClass for the given class.
 
TClass *TCling::GenerateTClass(ClassInfo_t *classinfo, Bool_t silent /* = kFALSE */)
{
   TClingClassInfo *info = (TClingClassInfo*)classinfo;
   if (!info || !info->IsValid()) {
      Fatal("GenerateTClass","Requires a valid ClassInfo object");
      return 0;
   }
   // We are in the case where we have AST nodes for this class.
   TClass *cl = 0;
   std::string classname;
   info->FullName(classname,*fNormalizedCtxt); // Could we use Name()?
   if (TClassEdit::IsSTLCont(classname)) {
#if 0
      Info("GenerateTClass","Will (try to) generate the compiled TClass for %s.",classname.c_str());
      // We need to build up the list of required headers, by
      // looking at each template arguments.
      TString includes;
      GenerateTClass_GatherInnerIncludes(fInterpreter,includes,info);
 
      if (0 == GenerateDictionary(classname.c_str(),includes)) {
         // 0 means success.
         cl = TClass::LoadClass(classnam.c_str(), silent);
         if (cl == 0) {
            Error("GenerateTClass","Even though the dictionary generation for %s seemed successful we can't find the TClass bootstrap!",classname.c_str());
         }
      }
#endif
      if (cl == 0) {
         int version = TClass::GetClass("TVirtualStreamerInfo")->GetClassVersion();
         cl = new TClass(classinfo, version, 0, 0, -1, -1, silent);
         cl->SetBit(TClass::kIsEmulation);
      }
   } else {
      // For regular class, just create a TClass on the fly ...
      // Not quite useful yet, but that what CINT used to do anyway.
      cl = new TClass(classinfo, 1, 0, 0, -1, -1, silent);
   }
   // Add the new TClass to the map of declid and TClass*.
   if (cl) {
      TClass::AddClassToDeclIdMap(((TClingClassInfo*)classinfo)->GetDeclId(), cl);
   }
   return cl;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Generate the dictionary for the C++ classes listed in the first
/// argument (in a semi-colon separated list).
/// 'includes' contains a semi-colon separated list of file to
/// #include in the dictionary.
/// For example:
/// ~~~ {.cpp}
///    gInterpreter->GenerateDictionary("vector<vector<float> >;list<vector<float> >","list;vector");
/// ~~~
/// or
/// ~~~ {.cpp}
///    gInterpreter->GenerateDictionary("myclass","myclass.h;myhelper.h");
/// ~~~
 
Int_t TCling::GenerateDictionary(const char* classes, const char* includes /* = "" */, const char* /* options  = 0 */)
{
   if (classes == 0 || classes[0] == 0) {
      Error("TCling::GenerateDictionary", "Cannot generate dictionary without passing classes.");
      return 0;
   }
   // Split the input list
   std::vector<std::string> listClasses;
   for (
      const char* current = classes, *prev = classes;
      *current != 0;
      ++current
   ) {
      if (*current == ';') {
         listClasses.push_back(std::string(prev, current - prev));
         prev = current + 1;
      }
      else if (*(current + 1) == 0) {
         listClasses.push_back(std::string(prev, current + 1 - prev));
         prev = current + 1;
      }
   }
   std::vector<std::string> listIncludes;
   if (!includes)
      includes = "";
   for (
      const char* current = includes, *prev = includes;
      *current != 0;
      ++current
   ) {
      if (*current == ';') {
         listIncludes.push_back(std::string(prev, current - prev));
         prev = current + 1;
      }
      else if (*(current + 1) == 0) {
         listIncludes.push_back(std::string(prev, current + 1 - prev));
         prev = current + 1;
      }
   }
   // Generate the temporary dictionary file
   return !TCling_GenerateDictionary(listClasses, listIncludes,
      std::vector<std::string>(), std::vector<std::string>());
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling Decl of global/static variable that is located
/// at the address given by addr.
 
TInterpreter::DeclId_t TCling::GetDataMember(ClassInfo_t *opaque_cl, const char *name) const
{
   R__LOCKGUARD(gInterpreterMutex);
   DeclId_t d;
   TClingClassInfo *cl = (TClingClassInfo*)opaque_cl;
 
   if (cl) {
      d = cl->GetDataMember(name);
      // We check if the decl of the data member has an annotation which indicates
      // an ioname.
      // In case this is true, if the name requested is not the ioname, we
      // return 0, as if the member did not exist. In some sense we override
      // the information in the TClassInfo instance, isolating the typesystem in
      // TClass from the one in the AST.
      if (const ValueDecl* decl = (const ValueDecl*) d){
         std::string ioName;
         bool hasIoName = ROOT::TMetaUtils::ExtractAttrPropertyFromName(*decl,"ioname",ioName);
         if (hasIoName && ioName != name) return 0;
      }
      return d;
   }
   // We are looking up for something on the TU scope.
   // FIXME: We do not want to go through TClingClassInfo(fInterpreter) because of redundant deserializations. That
   // interface will actually construct iterators and walk over the decls on the global scope. In would return the first
   // occurrence of a decl with the looked up name. However, that's not what C++ lookup would do: if we want to switch
   // to a more complete C++ lookup interface we need sift through the found names and pick up the declarations which
   // are only fulfilling ROOT's understanding for a Data Member.
   // FIXME: We should probably deprecate the TClingClassInfo(fInterpreter) interface and replace it withe something
   // similar as below.
   using namespace clang;
   Sema& SemaR = fInterpreter->getSema();
   DeclarationName DName = &SemaR.Context.Idents.get(name);
 
   LookupResult R(SemaR, DName, SourceLocation(), Sema::LookupOrdinaryName,
                  Sema::ForRedeclaration);
 
   // Could trigger deserialization of decls.
   cling::Interpreter::PushTransactionRAII RAII(GetInterpreterImpl());
   cling::utils::Lookup::Named(&SemaR, R);
 
   LookupResult::Filter F = R.makeFilter();
   // Filter the data-member looking decls.
   while (F.hasNext()) {
      NamedDecl *D = F.next();
      if (isa<VarDecl>(D) || isa<FieldDecl>(D) || isa<EnumConstantDecl>(D) ||
          isa<IndirectFieldDecl>(D))
         continue;
      F.erase();
   }
   F.done();
 
   if (R.isSingleResult())
      return R.getFoundDecl();
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling Decl of global/static variable that is located
/// at the address given by addr.
 
TInterpreter::DeclId_t TCling::GetEnum(TClass *cl, const char *name) const
{
   R__LOCKGUARD(gInterpreterMutex);
 
   const clang::Decl* possibleEnum = 0;
   // FInd the context of the decl.
   if (cl) {
      TClingClassInfo *cci = (TClingClassInfo*)cl->GetClassInfo();
      if (cci) {
         const clang::DeclContext* dc = 0;
         if (const clang::Decl* D = cci->GetDecl()) {
            if (!(dc = dyn_cast<clang::NamespaceDecl>(D))) {
               dc = dyn_cast<clang::RecordDecl>(D);
            }
         }
         if (dc) {
            // If it is a data member enum.
            // Could trigger deserialization of decls.
            cling::Interpreter::PushTransactionRAII RAII(GetInterpreterImpl());
            possibleEnum = cling::utils::Lookup::Tag(&fInterpreter->getSema(), name, dc);
         } else {
            Error("TCling::GetEnum", "DeclContext not found for %s .\n", name);
         }
      }
   } else {
      // If it is a global enum.
      // Could trigger deserialization of decls.
      cling::Interpreter::PushTransactionRAII RAII(GetInterpreterImpl());
      possibleEnum = cling::utils::Lookup::Tag(&fInterpreter->getSema(), name);
   }
   if (possibleEnum && (possibleEnum != (clang::Decl*)-1)
       && isa<clang::EnumDecl>(possibleEnum)) {
      return possibleEnum;
   }
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling DeclId for a global value
 
TInterpreter::DeclId_t TCling::GetDeclId( const llvm::GlobalValue *gv ) const
{
   if (!gv) return 0;
 
   llvm::StringRef mangled_name = gv->getName();
 
   int err = 0;
   char* demangled_name_c = TClassEdit::DemangleName(mangled_name.str().c_str(), err);
   if (err) {
      if (err == -2) {
         // It might simply be an unmangled global name.
         DeclId_t d;
         TClingClassInfo gcl(GetInterpreterImpl());
         d = gcl.GetDataMember(mangled_name.str().c_str());
         return d;
      }
      return 0;
   }
 
   std::string scopename(demangled_name_c);
   free(demangled_name_c);
 
   //
   //  Separate out the class or namespace part of the
   //  function name.
   //
   std::string dataname;
 
   if (!strncmp(scopename.c_str(), "typeinfo for ", sizeof("typeinfo for ")-1)) {
      scopename.erase(0, sizeof("typeinfo for ")-1);
   } else if (!strncmp(scopename.c_str(), "vtable for ", sizeof("vtable for ")-1)) {
      scopename.erase(0, sizeof("vtable for ")-1);
   } else {
      // See if it is a function
      std::string::size_type pos = scopename.rfind('(');
      if (pos != std::string::npos) {
         return 0;
      }
      // Separate the scope and member name
      pos = scopename.rfind(':');
      if (pos != std::string::npos) {
         if ((pos != 0) && (scopename[pos-1] == ':')) {
            dataname = scopename.substr(pos+1);
            scopename.erase(pos-1);
         }
      } else {
         scopename.clear();
         dataname = scopename;
      }
   }
   //fprintf(stderr, "name: '%s'\n", name.c_str());
   // Now we have the class or namespace name, so do the lookup.
 
 
   DeclId_t d;
   if (scopename.size()) {
      TClingClassInfo cl(GetInterpreterImpl(), scopename.c_str());
      d = cl.GetDataMember(dataname.c_str());
   }
   else {
      TClingClassInfo gcl(GetInterpreterImpl());
      d = gcl.GetDataMember(dataname.c_str());
   }
   return d;
}
 
////////////////////////////////////////////////////////////////////////////////
/// NOT IMPLEMENTED.
 
TInterpreter::DeclId_t TCling::GetDataMemberWithValue(const void *ptrvalue) const
{
   Error("GetDataMemberWithValue()", "not implemented");
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling DeclId for a data member with a given name.
 
TInterpreter::DeclId_t TCling::GetDataMemberAtAddr(const void *addr) const
{
   // NOT IMPLEMENTED.
   Error("GetDataMemberAtAddr()", "not implemented");
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the cling mangled name for a method of a class with parameters
/// params (params is a string of actual arguments, not formal ones). If the
/// class is 0 the global function list will be searched.
 
TString TCling::GetMangledName(TClass* cl, const char* method,
                               const char* params, Bool_t objectIsConst /* = kFALSE */)
{
   R__LOCKGUARD(gInterpreterMutex);
   TClingCallFunc func(GetInterpreterImpl(), *fNormalizedCtxt);
   if (cl) {
      Long_t offset;
      func.SetFunc((TClingClassInfo*)cl->GetClassInfo(), method, params, objectIsConst,
         &offset);
   }
   else {
      TClingClassInfo gcl(GetInterpreterImpl());
      Long_t offset;
      func.SetFunc(&gcl, method, params, &offset);
   }
   TClingMethodInfo* mi = (TClingMethodInfo*) func.FactoryMethod();
   if (!mi) return "";
   TString mangled_name( mi->GetMangledName() );
   delete mi;
   return mangled_name;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the cling mangled name for a method of a class with a certain
/// prototype, i.e. "char*,int,float". If the class is 0 the global function
/// list will be searched.
 
TString TCling::GetMangledNameWithPrototype(TClass* cl, const char* method,
                                            const char* proto, Bool_t objectIsConst /* = kFALSE */,
                                            EFunctionMatchMode mode /* = kConversionMatch */)
{
   R__LOCKGUARD(gInterpreterMutex);
   if (cl) {
      return ((TClingClassInfo*)cl->GetClassInfo())->
         GetMethod(method, proto, objectIsConst, 0 /*poffset*/, mode).GetMangledName();
   }
   TClingClassInfo gcl(GetInterpreterImpl());
   return gcl.GetMethod(method, proto, objectIsConst, 0 /*poffset*/, mode).GetMangledName();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling interface function for a method of a class with
/// parameters params (params is a string of actual arguments, not formal
/// ones). If the class is 0 the global function list will be searched.
 
void* TCling::GetInterfaceMethod(TClass* cl, const char* method,
                                 const char* params, Bool_t objectIsConst /* = kFALSE */)
{
   R__LOCKGUARD(gInterpreterMutex);
   TClingCallFunc func(GetInterpreterImpl(), *fNormalizedCtxt);
   if (cl) {
      Long_t offset;
      func.SetFunc((TClingClassInfo*)cl->GetClassInfo(), method, params, objectIsConst,
                   &offset);
   }
   else {
      TClingClassInfo gcl(GetInterpreterImpl());
      Long_t offset;
      func.SetFunc(&gcl, method, params, &offset);
   }
   return (void*) func.InterfaceMethod();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling interface function for a method of a class with
/// a certain name.
 
TInterpreter::DeclId_t TCling::GetFunction(ClassInfo_t *opaque_cl, const char* method)
{
   R__LOCKGUARD(gInterpreterMutex);
   DeclId_t f;
   TClingClassInfo *cl = (TClingClassInfo*)opaque_cl;
   if (cl) {
      f = cl->GetMethod(method).GetDeclId();
   }
   else {
      TClingClassInfo gcl(GetInterpreterImpl());
      f = gcl.GetMethod(method).GetDeclId();
   }
   return f;
 
}
 
////////////////////////////////////////////////////////////////////////////////
/// Insert overloads of name in cl to res.
 
void TCling::GetFunctionOverloads(ClassInfo_t *cl, const char *funcname,
                                  std::vector<DeclId_t>& res) const
{
   clang::Sema& S = fInterpreter->getSema();
   clang::ASTContext& Ctx = S.Context;
   const clang::Decl* CtxDecl
      = cl ? (const clang::Decl*)((TClingClassInfo*)cl)->GetDeclId():
      Ctx.getTranslationUnitDecl();
   auto RecDecl = llvm::dyn_cast<const clang::RecordDecl>(CtxDecl);
   const clang::DeclContext* DeclCtx = RecDecl;
 
   if (!DeclCtx)
      DeclCtx = dyn_cast<clang::NamespaceDecl>(CtxDecl);
   if (!DeclCtx) return;
 
   clang::DeclarationName DName;
   // The DeclarationName is funcname, unless it's a ctor or dtor.
   // FIXME: or operator or conversion! See enum clang::DeclarationName::NameKind.
 
   if (RecDecl) {
      if (RecDecl->getNameAsString() == funcname) {
         clang::QualType QT = Ctx.getTypeDeclType(RecDecl);
         DName = Ctx.DeclarationNames.getCXXConstructorName(Ctx.getCanonicalType(QT));
      } else if (funcname[0] == '~' && RecDecl->getNameAsString() == funcname + 1) {
         clang::QualType QT = Ctx.getTypeDeclType(RecDecl);
         DName = Ctx.DeclarationNames.getCXXDestructorName(Ctx.getCanonicalType(QT));
      } else {
         DName = &Ctx.Idents.get(funcname);
      }
   } else {
      DName = &Ctx.Idents.get(funcname);
   }
 
   // NotForRedeclaration: we want to find names in inline namespaces etc.
   clang::LookupResult R(S, DName, clang::SourceLocation(),
                         Sema::LookupOrdinaryName, clang::Sema::NotForRedeclaration);
   R.suppressDiagnostics(); // else lookup with NotForRedeclaration will check access etc
   S.LookupQualifiedName(R, const_cast<DeclContext*>(DeclCtx));
   if (R.empty()) return;
   R.resolveKind();
   res.reserve(res.size() + (R.end() - R.begin()));
   for (clang::LookupResult::iterator IR = R.begin(), ER = R.end();
        IR != ER; ++IR) {
      if (const clang::FunctionDecl* FD
          = llvm::dyn_cast<const clang::FunctionDecl>(*IR)) {
         if (!FD->getDescribedFunctionTemplate()) {
            res.push_back(FD);
         }
      } else if (const auto *USD = llvm::dyn_cast<const clang::UsingShadowDecl>(*IR)) {
         // FIXME: multi-level using
         if (llvm::isa<clang::FunctionDecl>(USD->getTargetDecl())) {
            res.push_back(USD);
         }
      }
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling interface function for a method of a class with
/// a certain prototype, i.e. "char*,int,float". If the class is 0 the global
/// function list will be searched.
 
void* TCling::GetInterfaceMethodWithPrototype(TClass* cl, const char* method,
                                              const char* proto,
                                              Bool_t objectIsConst /* = kFALSE */,
                                              EFunctionMatchMode mode /* = kConversionMatch */)
{
   R__LOCKGUARD(gInterpreterMutex);
   void* f;
   if (cl) {
      f = ((TClingClassInfo*)cl->GetClassInfo())->
         GetMethod(method, proto, objectIsConst, 0 /*poffset*/, mode).InterfaceMethod(*fNormalizedCtxt);
   }
   else {
      TClingClassInfo gcl(GetInterpreterImpl());
      f = gcl.GetMethod(method, proto, objectIsConst, 0 /*poffset*/, mode).InterfaceMethod(*fNormalizedCtxt);
   }
   return f;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling DeclId for a method of a class with
/// a certain prototype, i.e. "char*,int,float". If the class is 0 the global
/// function list will be searched.
 
TInterpreter::DeclId_t TCling::GetFunctionWithValues(ClassInfo_t *opaque_cl, const char* method,
                                                     const char* params,
                                                     Bool_t objectIsConst /* = kFALSE */)
{
   R__LOCKGUARD(gInterpreterMutex);
   DeclId_t f;
   TClingClassInfo *cl = (TClingClassInfo*)opaque_cl;
   if (cl) {
      f = cl->GetMethodWithArgs(method, params, objectIsConst, 0 /*poffset*/).GetDeclId();
   }
   else {
      TClingClassInfo gcl(GetInterpreterImpl());
      f = gcl.GetMethod(method, params, objectIsConst, 0 /*poffset*/).GetDeclId();
   }
   return f;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling interface function for a method of a class with
/// a certain prototype, i.e. "char*,int,float". If the class is 0 the global
/// function list will be searched.
 
TInterpreter::DeclId_t TCling::GetFunctionWithPrototype(ClassInfo_t *opaque_cl, const char* method,
                                                        const char* proto,
                                                        Bool_t objectIsConst /* = kFALSE */,
                                                        EFunctionMatchMode mode /* = kConversionMatch */)
{
   R__LOCKGUARD(gInterpreterMutex);
   DeclId_t f;
   TClingClassInfo *cl = (TClingClassInfo*)opaque_cl;
   if (cl) {
      f = cl->GetMethod(method, proto, objectIsConst, 0 /*poffset*/, mode).GetDeclId();
   }
   else {
      TClingClassInfo gcl(GetInterpreterImpl());
      f = gcl.GetMethod(method, proto, objectIsConst, 0 /*poffset*/, mode).GetDeclId();
   }
   return f;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return pointer to cling interface function for a method of a class with
/// a certain name.
 
TInterpreter::DeclId_t TCling::GetFunctionTemplate(ClassInfo_t *opaque_cl, const char* name)
{
   R__LOCKGUARD(gInterpreterMutex);
   DeclId_t f;
   TClingClassInfo *cl = (TClingClassInfo*)opaque_cl;
   if (cl) {
      f = cl->GetFunctionTemplate(name);
   }
   else {
      TClingClassInfo gcl(GetInterpreterImpl());
      f = gcl.GetFunctionTemplate(name);
   }
   return f;
 
}
 
////////////////////////////////////////////////////////////////////////////////
/// The 'name' is known to the interpreter, this function returns
/// the internal version of this name (usually just resolving typedefs)
/// This is used in particular to synchronize between the name used
/// by rootcling and by the run-time environment (TClass)
/// Return 0 if the name is not known.
 
void TCling::GetInterpreterTypeName(const char* name, std::string &output, Bool_t full)
{
   output.clear();
 
   R__LOCKGUARD(gInterpreterMutex);
 
   TClingClassInfo cl(GetInterpreterImpl(), name);
   if (!cl.IsValid()) {
      return ;
   }
   if (full) {
      cl.FullName(output,*fNormalizedCtxt);
      return;
   }
   // Well well well, for backward compatibility we need to act a bit too
   // much like CINT.
   TClassEdit::TSplitType splitname( cl.Name(), TClassEdit::kDropStd );
   splitname.ShortType(output, TClassEdit::kDropStd );
 
   return;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Execute a global function with arguments params.
///
/// FIXME: The cint-based version of this code does not check if the
///        SetFunc() call works, and does not do any real checking
///        for errors from the Exec() call.  It did fetch the most
///        recent cint security error and return that in error, but
///        this does not really translate well to cling/clang.  We
///        should enhance these interfaces so that we can report
///        compilation and runtime errors properly.
 
void TCling::Execute(const char* function, const char* params, int* error)
{
   R__LOCKGUARD_CLING(gInterpreterMutex);
   if (error) {
      *error = TInterpreter::kNoError;
   }
   TClingClassInfo cl(GetInterpreterImpl());
   Long_t offset = 0L;
   TClingCallFunc func(GetInterpreterImpl(), *fNormalizedCtxt);
   func.SetFunc(&cl, function, params, &offset);
   func.Exec(0);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Execute a method from class cl with arguments params.
///
/// FIXME: The cint-based version of this code does not check if the
///        SetFunc() call works, and does not do any real checking
///        for errors from the Exec() call.  It did fetch the most
///        recent cint security error and return that in error, but
///        this does not really translate well to cling/clang.  We
///        should enhance these interfaces so that we can report
///        compilation and runtime errors properly.
 
void TCling::Execute(TObject* obj, TClass* cl, const char* method,
                     const char* params, Bool_t objectIsConst, int* error)
{
   R__LOCKGUARD_CLING(gInterpreterMutex);
   if (error) {
      *error = TInterpreter::kNoError;
   }
   // If the actual class of this object inherits 2nd (or more) from TObject,
   // 'obj' is unlikely to be the start of the object (as described by IsA()),
   // hence gInterpreter->Execute will improperly correct the offset.
   void* addr = cl->DynamicCast(TObject::Class(), obj, kFALSE);
   Long_t offset = 0L;
   TClingCallFunc func(GetInterpreterImpl(), *fNormalizedCtxt);
   func.SetFunc((TClingClassInfo*)cl->GetClassInfo(), method, params, objectIsConst, &offset);
   void* address = (void*)((Long_t)addr + offset);
   func.Exec(address);
}
 
////////////////////////////////////////////////////////////////////////////////
 
void TCling::Execute(TObject* obj, TClass* cl, const char* method,
                    const char* params, int* error)
{
   Execute(obj,cl,method,params,false,error);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Execute a method from class cl with the arguments in array params
/// (params[0] ... params[n] = array of TObjString parameters).
/// Convert the TObjArray array of TObjString parameters to a character
/// string of comma separated parameters.
/// The parameters of type 'char' are enclosed in double quotes and all
/// internal quotes are escaped.
 
void TCling::Execute(TObject* obj, TClass* cl, TMethod* method,
                     TObjArray* params, int* error)
{
   if (!method) {
      Error("Execute", "No method was defined");
      return;
   }
   TList* argList = method->GetListOfMethodArgs();
   // Check number of actual parameters against of expected formal ones
 
   Int_t nparms = argList->LastIndex() + 1;
   Int_t argc   = params ? params->GetEntries() : 0;
 
   if (argc > nparms) {
      Error("Execute","Too many parameters to call %s, got %d but expected at most %d.",method->GetName(),argc,nparms);
      return;
   }
   if (nparms != argc) {
     // Let's see if the 'missing' argument are all defaulted.
     // if nparms==0 then either we stopped earlier either argc is also zero and we can't reach here.
     assert(nparms > 0);
 
     TMethodArg *arg = (TMethodArg *) argList->At( 0 );
     if (arg && arg->GetDefault() && arg->GetDefault()[0]) {
        // There is a default value for the first missing
        // argument, so we are fine.
     } else {
        Int_t firstDefault = -1;
        for (Int_t i = 0; i < nparms; i ++) {
           arg = (TMethodArg *) argList->At( i );
           if (arg && arg->GetDefault() && arg->GetDefault()[0]) {
              firstDefault = i;
              break;
           }
        }
        if (firstDefault >= 0) {
           Error("Execute","Too few arguments to call %s, got only %d but expected at least %d and at most %d.",method->GetName(),argc,firstDefault,nparms);
        } else {
           Error("Execute","Too few arguments to call %s, got only %d but expected %d.",method->GetName(),argc,nparms);
        }
        return;
     }
   }
 
   const char* listpar = "";
   TString complete(10);
   if (params) {
      // Create a character string of parameters from TObjArray
      TIter next(params);
      for (Int_t i = 0; i < argc; i ++) {
         TMethodArg* arg = (TMethodArg*) argList->At(i);
         TClingTypeInfo type(GetInterpreterImpl(), arg->GetFullTypeName());
         TObjString* nxtpar = (TObjString*) next();
         if (i) {
            complete += ',';
         }
         if (strstr(type.TrueName(*fNormalizedCtxt), "char")) {
            TString chpar('\"');
            chpar += (nxtpar->String()).ReplaceAll("\"", "\\\"");
            // At this point we have to check if string contains \\"
            // and apply some more sophisticated parser. Not implemented yet!
            complete += chpar;
            complete += '\"';
         }
         else {
            complete += nxtpar->String();
         }
      }
      listpar = complete.Data();
   }
 
   // And now execute it.
   R__LOCKGUARD_CLING(gInterpreterMutex);
   if (error) {
      *error = TInterpreter::kNoError;
   }
   // If the actual class of this object inherits 2nd (or more) from TObject,
   // 'obj' is unlikely to be the start of the object (as described by IsA()),
   // hence gInterpreter->Execute will improperly correct the offset.
   void* addr = cl->DynamicCast(TObject::Class(), obj, kFALSE);
   TClingCallFunc func(GetInterpreterImpl(), *fNormalizedCtxt);
   TClingMethodInfo *minfo = (TClingMethodInfo*)method->fInfo;
   func.Init(*minfo);
   func.SetArgs(listpar);
   // Now calculate the 'this' pointer offset for the method
   // when starting from the class described by cl.
   const CXXMethodDecl * mdecl = dyn_cast<CXXMethodDecl>(minfo->GetTargetFunctionDecl());
   Long_t offset = ((TClingClassInfo*)cl->GetClassInfo())->GetOffset(mdecl);
   void* address = (void*)((Long_t)addr + offset);
   func.Exec(address);
}
 
////////////////////////////////////////////////////////////////////////////////
 
void TCling::ExecuteWithArgsAndReturn(TMethod* method, void* address,
                                      const void* args[] /*=0*/,
                                      int nargs /*=0*/,
                                      void* ret/*= 0*/) const
{
   if (!method) {
      Error("ExecuteWithArgsAndReturn", "No method was defined");
      return;
   }
 
   TClingMethodInfo* minfo = (TClingMethodInfo*) method->fInfo;
   TClingCallFunc func(*minfo,*fNormalizedCtxt);
   func.ExecWithArgsAndReturn(address, args, nargs, ret);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Execute a cling macro.
 
Long_t TCling::ExecuteMacro(const char* filename, EErrorCode* error)
{
   R__LOCKGUARD_CLING(fLockProcessLine ? gInterpreterMutex : 0);
   fCurExecutingMacros.push_back(filename);
   Long_t result = TApplication::ExecuteFile(filename, (int*)error);
   fCurExecutingMacros.pop_back();
   return result;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the file name of the current un-included interpreted file.
/// See the documentation for GetCurrentMacroName().
 
const char* TCling::GetTopLevelMacroName() const
{
   Warning("GetTopLevelMacroName", "Must change return type!");
   return fCurExecutingMacros.back();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the file name of the currently interpreted file,
/// included or not. Example to illustrate the difference between
/// GetCurrentMacroName() and GetTopLevelMacroName():
/// ~~~ {.cpp}
///   void inclfile() {
///   std::cout << "In inclfile.C" << std::endl;
///   std::cout << "  TCling::GetCurrentMacroName() returns  " <<
///      TCling::GetCurrentMacroName() << std::endl;
///   std::cout << "  TCling::GetTopLevelMacroName() returns " <<
///      TCling::GetTopLevelMacroName() << std::endl;
///   }
/// ~~~
/// ~~~ {.cpp}
///   void mymacro() {
///   std::cout << "In mymacro.C" << std::endl;
///   std::cout << "  TCling::GetCurrentMacroName() returns  " <<
///      TCling::GetCurrentMacroName() << std::endl;
///   std::cout << "  TCling::GetTopLevelMacroName() returns " <<
///      TCling::GetTopLevelMacroName() << std::endl;
///   std::cout << "  Now calling inclfile..." << std::endl;
///   gInterpreter->ProcessLine(".x inclfile.C");;
///   }
/// ~~~
/// Running mymacro.C will print:
///
/// ~~~ {.cpp}
/// root [0] .x mymacro.C
/// ~~~
/// In mymacro.C
/// ~~~ {.cpp}
///   TCling::GetCurrentMacroName() returns  ./mymacro.C
///   TCling::GetTopLevelMacroName() returns ./mymacro.C
/// ~~~
///   Now calling inclfile...
/// In inclfile.h
/// ~~~ {.cpp}
///   TCling::GetCurrentMacroName() returns  inclfile.C
///   TCling::GetTopLevelMacroName() returns ./mymacro.C
/// ~~~
 
const char* TCling::GetCurrentMacroName() const
{
#if defined(R__MUST_REVISIT)
#if R__MUST_REVISIT(6,0)
   Warning("GetCurrentMacroName", "Must change return type!");
#endif
#endif
   return fCurExecutingMacros.back();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the absolute type of typeDesc.
/// E.g.: typeDesc = "class TNamed**", returns "TNamed".
/// You need to use the result immediately before it is being overwritten.
 
const char* TCling::TypeName(const char* typeDesc)
{
   TTHREAD_TLS(char*) t = 0;
   TTHREAD_TLS(unsigned int) tlen = 0;
 
   unsigned int dlen = strlen(typeDesc);
   if (dlen > tlen) {
      delete[] t;
      t = new char[dlen + 1];
      tlen = dlen;
   }
   const char* s, *template_start;
   if (!strstr(typeDesc, "(*)(")) {
      s = strchr(typeDesc, ' ');
      template_start = strchr(typeDesc, '<');
      if (!strcmp(typeDesc, "long long")) {
         strlcpy(t, typeDesc, dlen + 1);
      }
      else if (!strncmp(typeDesc, "unsigned ", s + 1 - typeDesc)) {
         strlcpy(t, typeDesc, dlen + 1);
      }
      // s is the position of the second 'word' (if any)
      // except in the case of templates where there will be a space
      // just before any closing '>': eg.
      //    TObj<std::vector<UShort_t,__malloc_alloc_template<0> > >*
      else if (s && (template_start == 0 || (s < template_start))) {
         strlcpy(t, s + 1, dlen + 1);
      }
      else {
         strlcpy(t, typeDesc, dlen + 1);
      }
   }
   else {
      strlcpy(t, typeDesc, dlen + 1);
   }
   int l = strlen(t);
   while (l > 0 && (t[l - 1] == '*' || t[l - 1] == '&')) {
      t[--l] = 0;
   }
   return t;
}
 
static bool requiresRootMap(const char* rootmapfile, cling::Interpreter* interp)
{
   assert(rootmapfile && *rootmapfile);
 
   llvm::StringRef libName = llvm::sys::path::filename(rootmapfile);
   libName.consume_back(".rootmap");
 
   return !gInterpreter->HasPCMForLibrary(libName.str().c_str());
}
 
////////////////////////////////////////////////////////////////////////////////
/// Read and parse a rootmapfile in its new format, and return 0 in case of
/// success, -1 if the file has already been read, and -3 in case its format
/// is the old one (e.g. containing "Library.ClassName"), -4 in case of syntax
/// error.
 
int TCling::ReadRootmapFile(const char *rootmapfile, TUniqueString *uniqueString)
{
   if (!(rootmapfile && *rootmapfile))
      return 0;
 
   if (!requiresRootMap(rootmapfile, GetInterpreterImpl()))
      return 0; // success
 
   // For "class ", "namespace ", "typedef ", "header ", "enum ", "var " respectively
   const std::map<char, unsigned int> keyLenMap = {{'c',6},{'n',10},{'t',8},{'h',7},{'e',5},{'v',4}};
 
   std::string rootmapfileNoBackslash(rootmapfile);
#ifdef _MSC_VER
   std::replace(rootmapfileNoBackslash.begin(), rootmapfileNoBackslash.end(), '\\', '/');
#endif
   // Add content of a specific rootmap file
   if (fRootmapFiles->FindObject(rootmapfileNoBackslash.c_str()))
      return -1;
 
   if (uniqueString)
      uniqueString->Append(std::string("\n#line 1 \"Forward declarations from ") + rootmapfileNoBackslash + "\"\n");
 
   std::ifstream file(rootmapfileNoBackslash);
   std::string line;
   line.reserve(200);
   std::string lib_name;
   line.reserve(100);
   bool newFormat = false;
   while (getline(file, line, '\n')) {
      if (!newFormat && (line.compare(0, 8, "Library.") == 0 || line.compare(0, 8, "Declare.") == 0)) {
         file.close();
         return -3; // old format
      }
      newFormat = true;
 
      if (line.compare(0, 9, "{ decls }") == 0) {
         // forward declarations
 
         while (getline(file, line, '\n')) {
            if (line[0] == '[')
               break;
            if (!uniqueString) {
               Error("ReadRootmapFile", "Cannot handle \"{ decls }\" sections in custom rootmap file %s",
                     rootmapfileNoBackslash.c_str());
               return -4;
            }
            uniqueString->Append(line);
         }
      }
      const char firstChar = line[0];
      if (firstChar == '[') {
         // new section (library)
         auto brpos = line.find(']');
         if (brpos == string::npos)
            continue;
         lib_name = line.substr(1, brpos - 1);
         size_t nspaces = 0;
         while (lib_name[nspaces] == ' ')
            ++nspaces;
         if (nspaces)
            lib_name.replace(0, nspaces, "");
         if (gDebug > 3) {
            TString lib_nameTstr(lib_name.c_str());
            TObjArray *tokens = lib_nameTstr.Tokenize(" ");
            const char *lib = ((TObjString *)tokens->At(0))->GetName();
            const char *wlib = gSystem->DynamicPathName(lib, kTRUE);
            if (wlib) {
               Info("ReadRootmapFile", "new section for %s", lib_nameTstr.Data());
            } else {
               Info("ReadRootmapFile", "section for %s (library does not exist)", lib_nameTstr.Data());
            }
            delete[] wlib;
            delete tokens;
         }
      } else {
         auto keyLenIt = keyLenMap.find(firstChar);
         if (keyLenIt == keyLenMap.end())
            continue;
         unsigned int keyLen = keyLenIt->second;
         // Do not make a copy, just start after the key
         const char *keyname = line.c_str() + keyLen;
         if (gDebug > 6)
            Info("ReadRootmapFile", "class %s in %s", keyname, lib_name.c_str());
         TEnvRec *isThere = fMapfile->Lookup(keyname);
         if (isThere) {
            if (lib_name != isThere->GetValue()) { // the same key for two different libs
               if (firstChar == 'n') {
                  if (gDebug > 3)
                     Info("ReadRootmapFile", "namespace %s found in %s is already in %s", keyname, lib_name.c_str(),
                          isThere->GetValue());
               } else if (firstChar == 'h') { // it is a header: add the libname to the list of libs to be loaded.
                  lib_name += " ";
                  lib_name += isThere->GetValue();
                  fMapfile->SetValue(keyname, lib_name.c_str());
               } else if (!TClassEdit::IsSTLCont(keyname)) {
                  Warning("ReadRootmapFile", "%s %s found in %s is already in %s", line.substr(0, keyLen).c_str(),
                          keyname, lib_name.c_str(), isThere->GetValue());
               }
            } else { // the same key for the same lib
               if (gDebug > 3)
                  Info("ReadRootmapFile", "Key %s was already defined for %s", keyname, lib_name.c_str());
            }
         } else {
            fMapfile->SetValue(keyname, lib_name.c_str());
         }
      }
   }
   file.close();
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create a resource table and read the (possibly) three resource files, i.e
/// $ROOTSYS/etc/system<name> (or ROOTETCDIR/system<name>), $HOME/<name> and
/// ./<name>. ROOT always reads ".rootrc" (in TROOT::InitSystem()). You can
/// read additional user defined resource files by creating additional TEnv
/// objects. By setting the shell variable ROOTENV_NO_HOME=1 the reading of
/// the $HOME/<name> resource file will be skipped. This might be useful in
/// case the home directory resides on an automounted remote file system
/// and one wants to avoid the file system from being mounted.
 
void TCling::InitRootmapFile(const char *name)
{
   assert(requiresRootMap(name, GetInterpreterImpl()) && "We have a module!");
 
   if (!requiresRootMap(name, GetInterpreterImpl()))
      return;
 
   Bool_t ignore = fMapfile->IgnoreDuplicates(kFALSE);
 
   fMapfile->SetRcName(name);
 
   TString sname = "system";
   sname += name;
   char *s = gSystem->ConcatFileName(TROOT::GetEtcDir(), sname);
 
   Int_t ret = ReadRootmapFile(s);
   if (ret == -3) // old format
      fMapfile->ReadFile(s, kEnvGlobal);
   delete [] s;
   if (!gSystem->Getenv("ROOTENV_NO_HOME")) {
      s = gSystem->ConcatFileName(gSystem->HomeDirectory(), name);
      ret = ReadRootmapFile(s);
      if (ret == -3) // old format
         fMapfile->ReadFile(s, kEnvUser);
      delete [] s;
      if (strcmp(gSystem->HomeDirectory(), gSystem->WorkingDirectory())) {
         ret = ReadRootmapFile(name);
         if (ret == -3) // old format
            fMapfile->ReadFile(name, kEnvLocal);
      }
   } else {
      ret = ReadRootmapFile(name);
      if (ret == -3) // old format
         fMapfile->ReadFile(name, kEnvLocal);
   }
   fMapfile->IgnoreDuplicates(ignore);
}
 
 
namespace {
   using namespace clang;
 
   class ExtVisibleStorageAdder: public RecursiveASTVisitor<ExtVisibleStorageAdder>{
      // This class is to be considered an helper for AutoLoading.
      // It is a recursive visitor is used to inspect namespaces coming from
      // forward declarations in rootmaps and to set the external visible
      // storage flag for them.
   public:
      ExtVisibleStorageAdder(std::unordered_set<const NamespaceDecl*>& nsSet): fNSSet(nsSet) {};
      bool VisitNamespaceDecl(NamespaceDecl* nsDecl) {
         // We want to enable the external lookup for this namespace
         // because it may shadow the lookup of other names contained
         // in that namespace
 
         nsDecl->setHasExternalVisibleStorage();
         fNSSet.insert(nsDecl);
         return true;
      }
   private:
      std::unordered_set<const NamespaceDecl*>& fNSSet;
 
   };
}
 
////////////////////////////////////////////////////////////////////////////////
/// Load map between class and library. If rootmapfile is specified a
/// specific rootmap file can be added (typically used by ACLiC).
/// In case of error -1 is returned, 0 otherwise.
/// The interpreter uses this information to automatically load the shared
/// library for a class (autoload mechanism), see the AutoLoad() methods below.
 
Int_t TCling::LoadLibraryMap(const char* rootmapfile)
{
   if (rootmapfile && *rootmapfile && !requiresRootMap(rootmapfile, GetInterpreterImpl()))
      return 0;
 
   R__LOCKGUARD(gInterpreterMutex);
 
   // open the [system].rootmap files
   if (!fMapfile) {
      fMapfile = new TEnv();
      fMapfile->IgnoreDuplicates(kTRUE);
      fRootmapFiles = new TObjArray;
      fRootmapFiles->SetOwner();
      InitRootmapFile(".rootmap");
   }
 
   // Prepare a list of all forward declarations for cling
   // For some experiments it is easily as big as 500k characters. To be on the
   // safe side, we go for 1M.
   TUniqueString uniqueString(1048576);
 
   // Load all rootmap files in the dynamic load path ((DY)LD_LIBRARY_PATH, etc.).
   // A rootmap file must end with the string ".rootmap".
   TString ldpath = gSystem->GetDynamicPath();
   if (ldpath != fRootmapLoadPath) {
      fRootmapLoadPath = ldpath;
#ifdef WIN32
      TObjArray* paths = ldpath.Tokenize(";");
#else
      TObjArray* paths = ldpath.Tokenize(":");
#endif
      TString d;
      for (Int_t i = 0; i < paths->GetEntriesFast(); i++) {
         d = ((TObjString *)paths->At(i))->GetString();
         // check if directory already scanned
         Int_t skip = 0;
         for (Int_t j = 0; j < i; j++) {
            TString pd = ((TObjString *)paths->At(j))->GetString();
            if (pd == d) {
               skip++;
               break;
            }
         }
         if (!skip) {
            void* dirp = gSystem->OpenDirectory(d);
            if (dirp) {
               if (gDebug > 3) {
                  Info("LoadLibraryMap", "%s", d.Data());
               }
               const char* f1;
               while ((f1 = gSystem->GetDirEntry(dirp))) {
                  TString f = f1;
                  if (f.EndsWith(".rootmap")) {
                     TString p;
                     p = d + "/" + f;
                     if (!gSystem->AccessPathName(p, kReadPermission)) {
                        if (!fRootmapFiles->FindObject(f) && f != ".rootmap") {
                           if (gDebug > 4) {
                              Info("LoadLibraryMap", "   rootmap file: %s", p.Data());
                           }
                           Int_t ret = ReadRootmapFile(p, &uniqueString);
 
                           if (ret == 0)
                              fRootmapFiles->Add(new TNamed(gSystem->BaseName(f), p.Data()));
                           if (ret == -3) {
                              // old format
                              fMapfile->ReadFile(p, kEnvGlobal);
                              fRootmapFiles->Add(new TNamed(f, p));
                           }
                        }
                        // else {
                        //    fprintf(stderr,"Reject %s because %s is already there\n",p.Data(),f.Data());
                        //    fRootmapFiles->FindObject(f)->ls();
                        // }
                     }
                  }
                  if (f.BeginsWith("rootmap")) {
                     TString p;
                     p = d + "/" + f;
                     FileStat_t stat;
                     if (gSystem->GetPathInfo(p, stat) == 0 && R_ISREG(stat.fMode)) {
                        Warning("LoadLibraryMap", "please rename %s to end with \".rootmap\"", p.Data());
                     }
                  }
               }
            }
            gSystem->FreeDirectory(dirp);
         }
      }
      delete paths;
      if (fMapfile->GetTable() && !