Changed std::unique_ptr<Entry> to std::shared_ptr<Entry> at avoid use after free issues

23 files changed, 193 insertions, 195 deletions

diff --git a/src/code.l b/src/code.l
index c0db62b..fb609e5 100644
--- a/src/code.l
+++ b/src/code.l
@@ -3877,6 +3877,10 @@ CCodeParser::CCodeParser() : p(std::make_unique<CCodeParser::Private>())
 
 CCodeParser::~CCodeParser()
 {
+  struct yyguts_t *yyg = (struct yyguts_t*)p->yyscanner;
+  yyextra->classScopeLengthStack.clear();
+  delete yyextra->codeClassSDict;
+  yyextra->codeClassSDict=0;
   codeYYlex_destroy(p->yyscanner);
 }
 
diff --git a/src/doxygen.cpp b/src/doxygen.cpp
index f29b2f8..fd4341c 100644
--- a/src/doxygen.cpp
+++ b/src/doxygen.cpp
@@ -422,9 +422,9 @@ static STLInfo g_stlinfo[] =
   { 0,                      0,                              0,                     0,             0,             0,            0,             FALSE,              FALSE }
 };
 
-static void addSTLMember(const std::unique_ptr<Entry> &root,const char *type,const char *name)
+static void addSTLMember(const std::shared_ptr<Entry> &root,const char *type,const char *name)
 {
-  std::unique_ptr<Entry> memEntry = std::make_unique<Entry>();
+  std::shared_ptr<Entry> memEntry = std::make_shared<Entry>();
   memEntry->name       = name;
   memEntry->type       = type;
   memEntry->protection = Public;
@@ -435,9 +435,9 @@ static void addSTLMember(const std::unique_ptr<Entry> &root,const char *type,con
   root->moveToSubEntryAndKeep(memEntry);
 }
 
-static void addSTLIterator(const std::unique_ptr<Entry> &classEntry,const char *name)
+static void addSTLIterator(const std::shared_ptr<Entry> &classEntry,const char *name)
 {
-  std::unique_ptr<Entry> iteratorClassEntry = std::make_unique<Entry>();
+  std::shared_ptr<Entry> iteratorClassEntry = std::make_shared<Entry>();
   iteratorClassEntry->fileName  = "[STL]";
   iteratorClassEntry->startLine = 1;
   iteratorClassEntry->name      = name;
@@ -448,14 +448,14 @@ static void addSTLIterator(const std::unique_ptr<Entry> &classEntry,const char *
   classEntry->moveToSubEntryAndKeep(iteratorClassEntry);
 }
 
-static void addSTLClass(const std::unique_ptr<Entry> &root,const STLInfo *info)
+static void addSTLClass(const std::shared_ptr<Entry> &root,const STLInfo *info)
 {
   //printf("Adding STL class %s\n",info->className);
   QCString fullName = info->className;
   fullName.prepend("std::");
 
   // add fake Entry for the class
-  std::unique_ptr<Entry> classEntry = std::make_unique<Entry>();
+  std::shared_ptr<Entry> classEntry = std::make_shared<Entry>();
   classEntry->fileName  = "[STL]";
   classEntry->startLine = 1;
   classEntry->name      = fullName;
@@ -490,9 +490,9 @@ static void addSTLClass(const std::unique_ptr<Entry> &root,const STLInfo *info)
     addSTLMember(classEntry,info->templType2,info->templName2);
   }
   if (fullName=="std::auto_ptr" || fullName=="std::smart_ptr" || fullName=="std::shared_ptr" ||
-      fullName=="std::unique_ptr" || fullName=="std::weak_ptr")
+      fullName=="std::shared_ptr" || fullName=="std::weak_ptr")
   {
-    std::unique_ptr<Entry> memEntry = std::make_unique<Entry>();
+    std::shared_ptr<Entry> memEntry = std::make_shared<Entry>();
     memEntry->name       = "operator->";
     memEntry->args       = "()";
     memEntry->type       = "T*";
@@ -523,9 +523,9 @@ static void addSTLClass(const std::unique_ptr<Entry> &root,const STLInfo *info)
 }
 
 
-static void addSTLClasses(const std::unique_ptr<Entry> &root)
+static void addSTLClasses(const std::shared_ptr<Entry> &root)
 {
-  std::unique_ptr<Entry> namespaceEntry = std::make_unique<Entry>();
+  std::shared_ptr<Entry> namespaceEntry = std::make_shared<Entry>();
   namespaceEntry->fileName  = "[STL]";
   namespaceEntry->startLine = 1;
   namespaceEntry->name      = "std";
@@ -9201,7 +9201,7 @@ static void compareDoxyfile()
 
 //----------------------------------------------------------------------------
 
-static void readTagFile(const std::unique_ptr<Entry> &root,const char *tl)
+static void readTagFile(const std::shared_ptr<Entry> &root,const char *tl)
 {
   QCString tagLine = tl;
   QCString fileName;
@@ -9370,7 +9370,7 @@ static OutlineParserInterface &getParserForFile(const char *fn)
 }
 
 static void parseFile(OutlineParserInterface &parser,
-                      const std::unique_ptr<Entry> &root,FileDef *fd,const char *fn,
+                      const std::shared_ptr<Entry> &root,FileDef *fd,const char *fn,
                       bool sameTu,QStrList &filesInSameTu)
 {
 #if USE_LIBCLANG
@@ -9423,7 +9423,7 @@ static void parseFile(OutlineParserInterface &parser,
     fd->getAllIncludeFilesRecursively(filesInSameTu);
   }
 
-  std::unique_ptr<Entry> fileRoot = std::make_unique<Entry>();
+  std::shared_ptr<Entry> fileRoot = std::make_shared<Entry>();
   // use language parse to parse the file
   parser.parseInput(fileName,convBuf.data(),fileRoot,sameTu,filesInSameTu);
   fileRoot->setFileDef(fd);
@@ -9431,7 +9431,7 @@ static void parseFile(OutlineParserInterface &parser,
 }
 
 //! parse the list of input files
-static void parseFiles(const std::unique_ptr<Entry> &root)
+static void parseFiles(const std::shared_ptr<Entry> &root)
 {
 #if USE_LIBCLANG
   static bool clangAssistedParsing = Config_getBool(CLANG_ASSISTED_PARSING);
@@ -10076,7 +10076,7 @@ class NullOutlineParser : public OutlineParserInterface
   public:
     void startTranslationUnit(const char *) {}
     void finishTranslationUnit() {}
-    void parseInput(const char *, const char *,const std::unique_ptr<Entry> &, bool, QStrList &) {}
+    void parseInput(const char *, const char *,const std::shared_ptr<Entry> &, bool, QStrList &) {}
     bool needsPreprocessing(const QCString &) const { return FALSE; }
     void parsePrototype(const char *) {}
 };
@@ -11266,7 +11266,7 @@ void parseInput()
    *             Handle Tag Files                                           *
    **************************************************************************/
 
-  std::unique_ptr<Entry> root = std::make_unique<Entry>();
+  std::shared_ptr<Entry> root = std::make_shared<Entry>();
   msg("Reading and parsing tag files\n");
 
   QStrList &tagFileList = Config_getList(TAGFILES);
diff --git a/src/entry.cpp b/src/entry.cpp
index 066c4a0..cc8cd1f 100644
--- a/src/entry.cpp
+++ b/src/entry.cpp
@@ -116,7 +116,7 @@ Entry::Entry(const Entry &e)
   m_sublist.reserve(e.m_sublist.size());
   for (const auto &cur : e.m_sublist)
   {
-    m_sublist.push_back(std::make_unique<Entry>(*cur));
+    m_sublist.push_back(std::make_shared<Entry>(*cur));
   }
 }
 
@@ -136,11 +136,11 @@ void Entry::moveToSubEntryAndRefresh(Entry *&current)
   current = new Entry;
 }
 
-void Entry::moveToSubEntryAndRefresh(std::unique_ptr<Entry> &current)
+void Entry::moveToSubEntryAndRefresh(std::shared_ptr<Entry> &current)
 {
   current->m_parent=this;
-  m_sublist.push_back(std::move(current));
-  current = std::make_unique<Entry>();
+  m_sublist.push_back(current);
+  current = std::make_shared<Entry>();
 }
 
 void Entry::moveToSubEntryAndKeep(Entry *current)
@@ -149,10 +149,10 @@ void Entry::moveToSubEntryAndKeep(Entry *current)
   m_sublist.emplace_back(current);
 }
 
-void Entry::moveToSubEntryAndKeep(std::unique_ptr<Entry> &current)
+void Entry::moveToSubEntryAndKeep(std::shared_ptr<Entry> &current)
 {
   current->m_parent=this;
-  m_sublist.push_back(std::move(current));
+  m_sublist.push_back(current);
 }
 
 void Entry::copyToSubEntry(Entry *current)
@@ -162,20 +162,20 @@ void Entry::copyToSubEntry(Entry *current)
   m_sublist.emplace_back(copy);
 }
 
-void Entry::copyToSubEntry(const std::unique_ptr<Entry> &current)
+void Entry::copyToSubEntry(const std::shared_ptr<Entry> &current)
 {
-  std::unique_ptr<Entry> copy = std::make_unique<Entry>(*current);
+  std::shared_ptr<Entry> copy = std::make_shared<Entry>(*current);
   copy->m_parent=this;
-  m_sublist.push_back(std::move(copy));
+  m_sublist.push_back(copy);
 }
 
-void Entry::moveFromSubEntry(const Entry *child,std::unique_ptr<Entry> &moveTo)
+void Entry::moveFromSubEntry(const Entry *child,std::shared_ptr<Entry> &moveTo)
 {
   auto it = std::find_if(m_sublist.begin(),m_sublist.end(),
-      [child](const std::unique_ptr<Entry>&elem) { return elem.get()==child; });
+      [child](const std::shared_ptr<Entry>&elem) { return elem.get()==child; });
   if (it!=m_sublist.end())
   {
-    moveTo = std::move(*it);
+    moveTo = *it;
     m_sublist.erase(it);
   }
   else
@@ -187,7 +187,7 @@ void Entry::moveFromSubEntry(const Entry *child,std::unique_ptr<Entry> &moveTo)
 void Entry::removeSubEntry(const Entry *e)
 {
   auto it = std::find_if(m_sublist.begin(),m_sublist.end(),
-      [e](const std::unique_ptr<Entry>&elem) { return elem.get()==e; });
+      [e](const std::shared_ptr<Entry>&elem) { return elem.get()==e; });
   if (it!=m_sublist.end())
   {
     m_sublist.erase(it);
diff --git a/src/entry.h b/src/entry.h
index 9d4ae9d..0391075 100644
--- a/src/entry.h
+++ b/src/entry.h
@@ -202,26 +202,26 @@ class Entry
     /*! Returns the list of children for this Entry
      *  @see addSubEntry() and removeSubEntry()
      */
-    const std::vector< std::unique_ptr<Entry> > &children() const { return m_sublist; }
+    const std::vector< std::shared_ptr<Entry> > &children() const { return m_sublist; }
 
     /*! @name add entry as a child and pass ownership.
      *  @note This makes the entry passed invalid! (TODO: tclscanner.l still has use after move!)
      *  @{
      */
     void moveToSubEntryAndKeep(Entry* e);
-    void moveToSubEntryAndKeep(std::unique_ptr<Entry> &e);
+    void moveToSubEntryAndKeep(std::shared_ptr<Entry> &e);
     /*! @} */
 
     /*! @name add entry as a child, pass ownership and reinitialize entry */
     void moveToSubEntryAndRefresh(Entry* &e);
-    void moveToSubEntryAndRefresh(std::unique_ptr<Entry> &e);
+    void moveToSubEntryAndRefresh(std::shared_ptr<Entry> &e);
 
     /*! take \a child of of to list of children and move it into \a moveTo */
-    void moveFromSubEntry(const Entry *child,std::unique_ptr<Entry> &moveTo);
+    void moveFromSubEntry(const Entry *child,std::shared_ptr<Entry> &moveTo);
 
     /*! make a copy of \a e and add it as a child to this entry */
     void copyToSubEntry (Entry* e);
-    void copyToSubEntry (const std::unique_ptr<Entry> &e);
+    void copyToSubEntry (const std::shared_ptr<Entry> &e);
 
     /*! Removes entry \a e from the list of children.
      *  The entry will be deleted if found.
@@ -332,7 +332,7 @@ class Entry
 
   private:
     Entry         *m_parent;    //!< parent node in the tree
-    std::vector< std::unique_ptr<Entry> > m_sublist;
+    std::vector< std::shared_ptr<Entry> > m_sublist;
     Entry &operator=(const Entry &);
     FileDef       *m_fileDef;
 };
diff --git a/src/fortranscanner.h b/src/fortranscanner.h
index 7038882..7a13f47 100644
--- a/src/fortranscanner.h
+++ b/src/fortranscanner.h
@@ -32,7 +32,7 @@ class FortranOutlineParser : public OutlineParserInterface
     void finishTranslationUnit() {}
     void parseInput(const char *fileName,
                     const char *fileBuf,
-                    const std::unique_ptr<Entry> &root,
+                    const std::shared_ptr<Entry> &root,
                     bool sameTranslationUnit,
                     QStrList &filesInSameTranslationUnit);
     bool needsPreprocessing(const QCString &extension) const;
diff --git a/src/fortranscanner.l b/src/fortranscanner.l
index 9178f80..08c7a6a 100644
--- a/src/fortranscanner.l
+++ b/src/fortranscanner.l
@@ -145,7 +145,7 @@ static QCString         inputStringSemi; ///< Input string after command separat
 static unsigned int     inputPositionPrepass;
 static int              lineCountPrepass = 0;
 
-static QList<Entry>  subrCurrent;
+static std::vector< std::shared_ptr<Entry> >  subrCurrent;
 
 struct CommentInPrepass {
   int column;
@@ -162,14 +162,15 @@ static QFile            inputFile;
 static QCString		yyFileName;
 static int		yyLineNr     = 1 ;
 static int		yyColNr     = 0 ;
-static Entry*		current_root = 0 ;
-static Entry*		global_root  = 0 ;
-static Entry*		file_root    = 0 ;
-static Entry*		last_entry   = 0 ;
-static Entry*		last_enum    = 0 ;
-static std::unique_ptr<Entry> current;
+static Entry           *current_root = 0;
+static Entry           *global_scope = 0;
+static std::shared_ptr<Entry> global_root;
+static std::shared_ptr<Entry> file_root;
+static std::shared_ptr<Entry> last_entry;
+static std::shared_ptr<Entry> last_enum;
+static std::shared_ptr<Entry> current;
 static ScanVar          v_type       = V_IGNORE; // type of parsed variable
-static std::vector<Entry*>  moduleProcedures; // list of all interfaces which contain unresolved 
+static std::vector<std::shared_ptr<Entry> >  moduleProcedures; // list of all interfaces which contain unresolved 
                                           // module procedures
 static QCString         docBlock;
 static bool             docBlockInBody = FALSE;
@@ -202,7 +203,6 @@ static SymbolModifiers currentModifiers;
 //! Holds program scope->symbol name->symbol modifiers.
 static QMap<Entry*,QMap<QCString,SymbolModifiers> > modifiers;
 
-static Entry           *global_scope = 0;
 static int              anonCount    = 0 ;
 //-----------------------------------------------------------------------------
 
@@ -491,13 +491,13 @@ SCOPENAME ({ID}{BS}"::"{BS})*
                                           QCString name = QCString(yytext).stripWhiteSpace();
                                           name = name.right(name.length() - 9).stripWhiteSpace().lower();
                                           addInterface(name, ifType);
-                                          startScope(last_entry);
+                                          startScope(last_entry.get());
                                         }
 }
 
 <InterfaceBody>^{BS}end{BS}interface({BS_}{ID})? {
                                           // end scope only if GENERIC interface
-                                          if (ifType == IF_GENERIC)last_entry->parent()->endBodyLine = yyLineNr - 1;
+                                          if (ifType == IF_GENERIC) last_entry->parent()->endBodyLine = yyLineNr - 1;
                                           if (ifType == IF_GENERIC && !endScope(current_root))
                                             yyterminate();
 
@@ -510,12 +510,12 @@ SCOPENAME ({ID}{BS}"::"{BS})*
 <ModuleProcedure>{ID}                   { if (ifType == IF_ABSTRACT || ifType == IF_SPECIFIC)
                                           {
                                             addInterface(yytext, ifType);
-                                            startScope(last_entry);
+                                            startScope(last_entry.get());
                                           }
 
                                           current->section = Entry::FUNCTION_SEC ;
                                           current->name = yytext; 
-                                          moduleProcedures.push_back(current.get());
+                                          moduleProcedures.push_back(current);
                                           addCurrentEntry(true);
                                         }
 <ModuleProcedure>"\n"                   { yyColNr -= 1;
@@ -639,7 +639,7 @@ private                                 {
                                           current->startLine  = yyLineNr;
 
                                           /* if type is part of a module, mod name is necessary for output */
-                                          if ((current_root) && 
+                                          if (current_root && 
                                               (current_root->section == Entry::CLASS_SEC
                                                || current_root->section == Entry::NAMESPACE_SEC))
                                           {
@@ -647,7 +647,7 @@ private                                 {
                                           }
 
                                           addCurrentEntry(true);
-                                          startScope(last_entry); 
+                                          startScope(last_entry.get()); 
                                           BEGIN(TypedefBody);
                                         }
 }
@@ -727,7 +727,7 @@ private                                 {
 
 					   if (!endScope(current_root))
 					     yyterminate();
-                                           subrCurrent.remove(0u);
+                                           subrCurrent.pop_back();
 					   yy_pop_state() ;
 				        }
 <BlockData>{
@@ -736,7 +736,7 @@ private                                 {
 }
 <Start,ModuleBody,TypedefBody,SubprogBody,Enum>{
 ^{BS}{TYPE_SPEC}/{SEPARATE}             {
-                                          last_enum = 0;
+                                          last_enum.reset();
                                           if (YY_START == Enum)
                                           {
 					    argType = "@"; // enum marker
@@ -867,7 +867,7 @@ private                                 {
                                             {
                                               current_root->copyToSubEntry(current);
                                               // add to the scope surrounding the enum (copy!)
-                                              last_enum = current.get();
+                                              last_enum = current;
                                               current_root->parent()->moveToSubEntryAndRefresh(current);
                                               initEntry();
                                             }
@@ -1066,7 +1066,7 @@ private                                 {
                                           }
 
                                           addCurrentEntry(true);
-                                          startScope(last_entry); 
+                                          startScope(last_entry.get()); 
 					  BEGIN( Enum ) ;
                                         }
 <Enum>"end"{BS}"enum"                   {
@@ -1083,7 +1083,7 @@ private                                 {
                                          if (ifType == IF_ABSTRACT || ifType == IF_SPECIFIC)
                                          {
                                            addInterface("$interface$", ifType);
-                                           startScope(last_entry);
+                                           startScope(last_entry.get());
                                          }
 
                                          // TYPE_SPEC is for old function style function result
@@ -1109,7 +1109,7 @@ private                                 {
                                          if (ifType == IF_ABSTRACT || ifType == IF_SPECIFIC)
                                          {
                                            addInterface("$interface$", ifType);
-                                           startScope(last_entry);
+                                           startScope(last_entry.get());
                                          }
 
                                          result = QCString(yytext).stripWhiteSpace();
@@ -1136,7 +1136,7 @@ private                                 {
 				         current->args += ")";
 				         current->args = removeRedundantWhiteSpace(current->args);
                                          addCurrentEntry(true);
-					 startScope(last_entry);
+					 startScope(last_entry.get());
 					 BEGIN(SubprogBody);
 				       }
 <Parameterlist>{COMMA}|{BS}            { current->args += yytext;
@@ -1162,7 +1162,7 @@ private                                 {
 				           newLine();
 					   //printf("3=========> without parameterlist \n");
                                            addCurrentEntry(true);
-					   startScope(last_entry);
+					   startScope(last_entry.get());
 					   BEGIN(SubprogBody);				           
 }
 <SubprogBody>result{BS}\({BS}{ID}      {  
@@ -1214,20 +1214,19 @@ private                                 {
 					  unput(*yytext);                                        
 					  if (v_type == V_VARIABLE) 
 					  {
-                                            std::unique_ptr<Entry> tmp_entry;
-                                            current.swap(tmp_entry);
+                                            std::shared_ptr<Entry> tmp_entry = current;
                                             // temporarily switch to the previous entry
                                             if (last_enum)
                                             {
-                                              current.reset(last_enum);
+                                              current = last_enum;
                                             }
                                             else
                                             {
-					      current.reset(last_entry);
+					      current = last_entry;
                                             }
   					    handleCommentBlock(docBlock,TRUE);
                                             // switch back
- 					    tmp_entry.swap(current);
+ 					    current = tmp_entry;
                                           }
 					  else if (v_type == V_PARAMETER) 
 					  {
@@ -1779,7 +1778,7 @@ static void popBuffer() {
 }
 
 /** used to copy entry to an interface module procedure */
-static void copyEntry(Entry *dest, const std::unique_ptr<Entry> &src) 
+static void copyEntry(std::shared_ptr<Entry> dest, const std::shared_ptr<Entry> &src) 
 {
    dest->type        = src->type;
    dest->fileName    = src->fileName;
@@ -2306,7 +2305,7 @@ static int yyread(char *buf,int max_size)
 
 static void initParser()
 {
-  last_entry = 0;
+  last_entry.reset();
 }
 
 static void initEntry()
@@ -2333,7 +2332,7 @@ static void addCurrentEntry(bool case_insens)
 {
   if (case_insens) current->name = current->name.lower();
   //printf("===Adding entry %s to %s\n", current->name.data(), current_root->name.data());
-  last_entry = current.get();
+  last_entry = current;
   current_root->moveToSubEntryAndRefresh(current);
   initEntry();
 }
@@ -2367,14 +2366,14 @@ static void addModule(const char *name, bool isModule)
   current->startLine  = yyLineNr;
   current->protection = Public ;
   addCurrentEntry(true);
-  startScope(last_entry);
+  startScope(last_entry.get());
 }
 
 
 static void addSubprogram(const char *text)
 {
   DBG_CTX((stderr,"1=========> got subprog, type: %s\n",text)); 
-  subrCurrent.prepend(current.get());
+  subrCurrent.push_back(current);
   current->section = Entry::FUNCTION_SEC ;
   QCString subtype = text; subtype=subtype.lower().stripWhiteSpace();
   functionLine = (subtype.find("function") != -1);
@@ -2487,7 +2486,7 @@ static void handleCommentBlock(const QCString &doc,bool brief)
   QCString processedDoc = preprocessCommentBlock(doc,yyFileName,lineNr);
   while (parseCommentBlock(
 	g_thisParser,
-	docBlockInBody ? subrCurrent.getFirst() : current.get(),
+	docBlockInBody ? subrCurrent.back().get() : current.get(),
 	processedDoc, // text
 	yyFileName, // file
 	lineNr,
@@ -2515,9 +2514,8 @@ static void subrHandleCommentBlock(const QCString &doc,bool brief)
   QCString loc_doc;
   loc_doc = doc.stripWhiteSpace();
 
-  std::unique_ptr<Entry> tmp_entry;
-  current.swap(tmp_entry);
-  current.reset(subrCurrent.getFirst()); // temporarily switch to the entry of the subroutine / function
+  std::shared_ptr<Entry> tmp_entry = current;
+  current = subrCurrent.back(); // temporarily switch to the entry of the subroutine / function
 
   // Still in the specification section so no inbodyDocs yet, but parameter documentation
   current->inbodyDocs = "";
@@ -2566,7 +2564,7 @@ static void subrHandleCommentBlock(const QCString &doc,bool brief)
       loc_doc.stripWhiteSpace();
       if (loc_doc.isEmpty() || (loc_doc.lower() == argName.lower()))
       {
-        tmp_entry.swap(current);
+        current = tmp_entry;
         return;
       }
       handleCommentBlock(QCString("\n\n@param ") + directionParam[SymbolModifiers::OUT] + " " + 
@@ -2610,7 +2608,7 @@ static void subrHandleCommentBlock(const QCString &doc,bool brief)
   }
 
   // reset current back to the part inside the routine
-  tmp_entry.swap(current);
+  current = tmp_entry;
 }
 //----------------------------------------------------------------------------
 /// Handle result description as defined after the declaration of the parameter
@@ -2619,9 +2617,8 @@ static void subrHandleCommentBlockResult(const QCString &doc,bool brief)
   QCString loc_doc;
   loc_doc = doc.stripWhiteSpace();
 
-  std::unique_ptr<Entry> tmp_entry;
-  current.swap(tmp_entry);
-  current.reset(subrCurrent.getFirst()); // temporarily switch to the entry of the subroutine / function
+  std::shared_ptr<Entry> tmp_entry = current;
+  current = subrCurrent.back(); // temporarily switch to the entry of the subroutine / function
 
   // Still in the specification section so no inbodyDocs yet, but parameter documentation
   current->inbodyDocs = "";
@@ -2640,7 +2637,7 @@ static void subrHandleCommentBlockResult(const QCString &doc,bool brief)
   }
 
   // reset current back to the part inside the routine
-  tmp_entry.swap(current);
+  current = tmp_entry;
 }
 
 //----------------------------------------------------------------------------
@@ -2661,7 +2658,7 @@ level--;
 
 
 static void parseMain(const char *fileName,const char *fileBuf,
-                      const std::unique_ptr<Entry> &rt, FortranFormat format)
+                      const std::shared_ptr<Entry> &rt, FortranFormat format)
 {
   char *tmpBuf = NULL;
   initParser();
@@ -2677,7 +2674,7 @@ static void parseMain(const char *fileName,const char *fileBuf,
   gstat         = FALSE;
   virt          = Normal;
   current_root  = rt.get();
-  global_root   = rt.get();
+  global_root   = rt;
   inputFile.setName(fileName);
   if (inputFile.open(IO_ReadOnly))
   {
@@ -2719,11 +2716,11 @@ static void parseMain(const char *fileName,const char *fileBuf,
     Doxygen::docGroup.enterFile(yyFileName,yyLineNr);
 
     // add entry for the file
-    current          = std::make_unique<Entry>();
+    current          = std::make_shared<Entry>();
     current->lang    = SrcLangExt_Fortran; 
     current->name    = yyFileName;
     current->section = Entry::SOURCE_SEC;
-    file_root        = current.get();
+    file_root        = current;
     current_root->moveToSubEntryAndRefresh(current);
     current->lang    = SrcLangExt_Fortran; 
 
@@ -2759,7 +2756,7 @@ static void parseMain(const char *fileName,const char *fileBuf,
 
 void FortranOutlineParser::parseInput(const char *fileName,
                                         const char *fileBuf,
-                                        const std::unique_ptr<Entry> &root,
+                                        const std::shared_ptr<Entry> &root,
                                         bool /*sameTranslationUnit*/,
                                         QStrList & /*filesInSameTranslationUnit*/)
 {
@@ -2799,7 +2796,7 @@ static void scanner_abort()
 
   for (const auto &ce : global_root->children())
   {
-     if (ce.get() == file_root) start=TRUE;
+     if (ce == file_root) start=TRUE;
      if (start) ce->reset(); 
   } 
 
diff --git a/src/markdown.cpp b/src/markdown.cpp
index 8511da3..42ea2ff 100644
--- a/src/markdown.cpp
+++ b/src/markdown.cpp
@@ -2578,11 +2578,11 @@ QCString markdownFileNameToId(const QCString &fileName)
 
 void MarkdownOutlineParser::parseInput(const char *fileName, 
                 const char *fileBuf, 
-                const std::unique_ptr<Entry> &root,
+                const std::shared_ptr<Entry> &root,
                 bool /*sameTranslationUnit*/,
                 QStrList & /*filesInSameTranslationUnit*/)
 {
-  std::unique_ptr<Entry> current = std::make_unique<Entry>();
+  std::shared_ptr<Entry> current = std::make_shared<Entry>();
   current->lang = SrcLangExt_Markdown;
   current->fileName = fileName;
   current->docFile  = fileName;
diff --git a/src/markdown.h b/src/markdown.h
index 4ce2f62..3ffd155 100644
--- a/src/markdown.h
+++ b/src/markdown.h
@@ -33,7 +33,7 @@ class MarkdownOutlineParser : public OutlineParserInterface
     void finishTranslationUnit() {}
     void parseInput(const char *fileName, 
                     const char *fileBuf, 
-                    const std::unique_ptr<Entry> &root,
+                    const std::shared_ptr<Entry> &root,
                     bool sameTranslationUnit,
                     QStrList &filesInSameTranslationUnit);
     bool needsPreprocessing(const QCString &) const { return FALSE; }
diff --git a/src/parserintf.h b/src/parserintf.h
index ddf2624..5095a1e 100644
--- a/src/parserintf.h
+++ b/src/parserintf.h
@@ -70,7 +70,7 @@ class OutlineParserInterface
      */
     virtual void parseInput(const char *fileName,
                             const char *fileBuf,
-                            const std::unique_ptr<Entry> &root,
+                            const std::shared_ptr<Entry> &root,
                             bool sameTranslationUnit,
                             QStrList &filesInSameTranslationUnit) = 0;
 
diff --git a/src/pyscanner.h b/src/pyscanner.h
index 73e1679..6cfadf6 100644
--- a/src/pyscanner.h
+++ b/src/pyscanner.h
@@ -38,7 +38,7 @@ class PythonOutlineParser : public OutlineParserInterface
     void finishTranslationUnit() {}
     void parseInput(const char * fileName, 
                     const char *fileBuf, 
-                    const std::unique_ptr<Entry> &root,
+                    const std::shared_ptr<Entry> &root,
                     bool sameTranslationUnit,
                     QStrList &filesInSameTranslationUnit);
     bool needsPreprocessing(const QCString &extension) const;
diff --git a/src/pyscanner.l b/src/pyscanner.l
index 963b4e8..efdc943 100644
--- a/src/pyscanner.l
+++ b/src/pyscanner.l
@@ -72,10 +72,10 @@ static QFile            inputFile;
 
 static Protection	protection;
 
-static Entry*		current_root = 0 ;
-static std::unique_ptr<Entry> current;
-static Entry*		previous     = 0 ;
-static Entry*		bodyEntry    = 0 ;
+static std::shared_ptr<Entry> current_root;
+static std::shared_ptr<Entry> current;
+static std::shared_ptr<Entry> previous;
+static std::shared_ptr<Entry> bodyEntry;
 static int		yyLineNr     = 1 ;
 static QCString		yyFileName;
 static MethodTypes 	mtype;
@@ -151,7 +151,7 @@ static void initEntry()
 
 static void newEntry()
 {
-  previous = current.get();
+  previous = current;
   current_root->moveToSubEntryAndRefresh(current);
   initEntry();
 }
@@ -292,7 +292,7 @@ static void handleCommentBlock(const QCString &doc,bool brief)
   QCString processedDoc = preprocessCommentBlock(doc,yyFileName,lineNr);
   while (parseCommentBlock(
 	g_thisParser,
-	(docBlockInBody && previous) ? previous : current.get(),
+	(docBlockInBody && previous) ? previous.get() : current.get(),
 	processedDoc, // text
 	yyFileName,   // file
 	lineNr,
@@ -913,7 +913,7 @@ STARTDOCSYMS      "##"
                             }
     {B}":"{B}		    { // function without arguments
 			      g_specialBlock = TRUE; // expecting a docstring
-			      bodyEntry = current.get();
+			      bodyEntry = current;
                               BEGIN(FunctionBody);
 			    }
 
@@ -1300,7 +1300,7 @@ STARTDOCSYMS      "##"
       				 current->program+=yytext;
 			         //current->startLine = yyLineNr;
 				 g_curIndent=computeIndent(yytext);
-				 bodyEntry = current.get();
+				 bodyEntry = current;
 				 DBG_CTX((stderr,"setting indent %d\n",g_curIndent));
 				 //printf("current->program=[%s]\n",current->program.data());
 				 //g_hideClassDocs = TRUE;
@@ -1706,12 +1706,12 @@ STARTDOCSYMS      "##"
 
 //----------------------------------------------------------------------------
 
-static void parseCompounds(Entry *rt)
+static void parseCompounds(std::shared_ptr<Entry> rt)
 {
   //printf("parseCompounds(%s)\n",rt->name.data());
   for (int i=0; i<rt->children().size(); ++i)
   {
-    Entry *ce = rt->children()[i].get();
+    std::shared_ptr<Entry> ce = rt->children()[i];
     if (!ce->program.isEmpty())
     {
       //printf("-- %s ---------\n%s\n---------------\n",
@@ -1727,14 +1727,14 @@ static void parseCompounds(Entry *rt)
       }
       else if (ce->parent())
       {
-        current_root = ce->parent();
+        current_root = rt;
 	//printf("Searching for member variables in %s parent=%s\n",
 	//    ce->name.data(),ce->parent->name.data());
 	BEGIN( SearchMemVars );
       }
       yyFileName = ce->fileName;
       yyLineNr   = ce->bodyLine ;
-      current = std::make_unique<Entry>();
+      current = std::make_shared<Entry>();
       initEntry();
 
       QCString name = ce->name;
@@ -1754,7 +1754,7 @@ static void parseCompounds(Entry *rt)
 //----------------------------------------------------------------------------
 
 
-static void parseMain(const char *fileName,const char *fileBuf,const std::unique_ptr<Entry> &rt)
+static void parseMain(const char *fileName,const char *fileBuf,const std::shared_ptr<Entry> &rt)
 {
   initParser();
 
@@ -1765,7 +1765,7 @@ static void parseMain(const char *fileName,const char *fileBuf,const std::unique
   mtype         = Method;
   gstat         = FALSE;
   virt          = Normal;
-  current_root  = rt.get();
+  current_root  = rt;
   g_specialBlock = FALSE;
 
 
@@ -1789,7 +1789,7 @@ static void parseMain(const char *fileName,const char *fileBuf,const std::unique
       g_moduleScope+=baseName;
     }
 
-    current            = std::make_unique<Entry>();
+    current            = std::make_shared<Entry>();
     initEntry();
     current->name      = g_moduleScope;
     current->section   = Entry::NAMESPACE_SEC;
@@ -1798,7 +1798,7 @@ static void parseMain(const char *fileName,const char *fileBuf,const std::unique
     current->startLine = yyLineNr;
     current->bodyLine  = yyLineNr;
 
-    current_root  = current.get();
+    current_root  = current;
 
     rt->moveToSubEntryAndRefresh(current);
 
@@ -1888,7 +1888,7 @@ void pyscanFreeScanner()
 
 void PythonOutlineParser::parseInput(const char *fileName,
                                        const char *fileBuf,
-                                       const std::unique_ptr<Entry> &root,
+                                       const std::shared_ptr<Entry> &root,
                                        bool /*sameTranslationUnit*/,
                                        QStrList & /*filesInSameTranslationUnit*/)
 {
diff --git a/src/scanner.h b/src/scanner.h
index 1c7a50c..70df660 100644
--- a/src/scanner.h
+++ b/src/scanner.h
@@ -35,7 +35,7 @@ class COutlineParser : public OutlineParserInterface
     void finishTranslationUnit();
     void parseInput(const char *fileName,
                     const char *fileBuf,
-                    const std::unique_ptr<Entry> &root,
+                    const std::shared_ptr<Entry> &root,
                     bool sameTranslationUnit,
                     QStrList &filesInSameTranslationUnit);
     bool needsPreprocessing(const QCString &extension) const;
diff --git a/src/scanner.l b/src/scanner.l
index ed2c88c..912132c 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -90,12 +90,12 @@ struct scannerYY_state
   int              curlyCount   = 0 ;
   int              squareCount  = 0 ;
   int              padCount     = 0 ;
-  std::unique_ptr<Entry> current;
-  Entry*           current_root = 0 ;
-  Entry*           previous     = 0 ;
-  std::unique_ptr<Entry> tempEntry;
-  Entry*           firstTypedefEntry = 0 ;
-  Entry*           memspecEntry = 0 ;
+  std::shared_ptr<Entry> current;
+  std::shared_ptr<Entry> current_root;
+  std::shared_ptr<Entry> previous;
+  std::shared_ptr<Entry> tempEntry;
+  std::shared_ptr<Entry> firstTypedefEntry;
+  std::shared_ptr<Entry> memspecEntry;
   int              yyLineNr     = 1 ;
   int              yyBegLineNr  = 1 ;
   int              yyColNr      = 1 ;
@@ -188,7 +188,7 @@ struct scannerYY_state
 
   int              fencedSize = 0;
   bool             nestedComment = 0;
-  std::vector< std::pair<Entry*,std::unique_ptr<Entry> > > outerScopeEntries;
+  std::vector< std::pair<Entry*,std::shared_ptr<Entry> > > outerScopeEntries;
 };
 
 static const char *stateToString(int state);
@@ -1001,7 +1001,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					  lineCount(yyscanner);
   					}
 <PackageName>";"			{
-                                          Entry *tmp = yyextra->current.get();
+                                          std::shared_ptr<Entry> tmp = yyextra->current;
 					  yyextra->current_root->moveToSubEntryAndRefresh(yyextra->current);
                                           yyextra->current_root = tmp;
 					  initEntry(yyscanner);
@@ -1684,7 +1684,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					    //printf("import name = %s -> %s\n",yytext,yyextra->current->name.data());
 					    yyextra->current->section=Entry::USINGDECL_SEC;
 					  }
-                                          yyextra->previous = yyextra->current.get();
+                                          yyextra->previous = yyextra->current;
 					  yyextra->current_root->moveToSubEntryAndRefresh(yyextra->current);
 					  initEntry(yyscanner);
 					  BEGIN(Using);
@@ -1702,7 +1702,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
                                           yyextra->current->fileName = yyextra->yyFileName; 
   					  yyextra->current->section=Entry::USINGDECL_SEC;
                                           yyextra->current->startLine = yyextra->yyLineNr;
-                                          yyextra->previous = yyextra->current.get();
+                                          yyextra->previous = yyextra->current;
 					  yyextra->current_root->moveToSubEntryAndRefresh(yyextra->current);
 					  initEntry(yyscanner);
 					  if (yyextra->insideCS) /* Hack: in C# a using declaration and 
@@ -2482,7 +2482,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
                                           if (yyextra->previous && yyextra->previous->section==Entry::GROUPDOC_SEC)
 					  {
 					    // link open command to the group defined in the yyextra->previous entry
-					    Doxygen::docGroup.open(yyextra->previous,yyextra->yyFileName,yyextra->yyLineNr);
+					    Doxygen::docGroup.open(yyextra->previous.get(),yyextra->yyFileName,yyextra->yyLineNr);
 					  }
 					  else
 					  {
@@ -3490,7 +3490,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					      // add to the scope surrounding the enum (copy!)
                                               // we cannot during it directly as that would invalidate the iterator in parseCompounds.
                                               //printf("*** adding outer scope entry for %s\n",yyextra->current->name.data());
-                                              yyextra->outerScopeEntries.emplace_back(yyextra->current_root->parent(), std::make_unique<Entry>(*yyextra->current));
+                                              yyextra->outerScopeEntries.emplace_back(yyextra->current_root->parent(), std::make_shared<Entry>(*yyextra->current));
 					    }
 					    yyextra->current_root->moveToSubEntryAndRefresh(yyextra->current);
 					    initEntry(yyscanner);
@@ -3587,7 +3587,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					  else
 					  {
 					    yyextra->current->endBodyLine = yyextra->yyLineNr;
-                                            Entry * original_root = yyextra->current_root; // save root this namespace is in
+                                            std::shared_ptr<Entry> original_root = yyextra->current_root; // save root this namespace is in
                                             if (yyextra->current->section == Entry::NAMESPACE_SEC && yyextra->current->type == "namespace")
                                             {
                                               int split_point;
@@ -3607,16 +3607,17 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
                                               yyextra->current->briefFile = "";
                                               while ((split_point = yyextra->current->name.find("::")) != -1)
                                               {
-                                                std::unique_ptr<Entry> new_current = std::make_unique<Entry>(*yyextra->current);
+                                                std::shared_ptr<Entry> new_current = std::make_shared<Entry>(*yyextra->current);
                                                 yyextra->current->program = "";
                                                 new_current->name  = yyextra->current->name.mid(split_point + 2);
                                                 yyextra->current->name  = yyextra->current->name.left(split_point);
                                                 if (!yyextra->current_root->name.isEmpty()) yyextra->current->name.prepend(yyextra->current_root->name+"::");
 
-                                                Entry *tmp = yyextra->current.get();
+                                                std::shared_ptr<Entry> tmp = yyextra->current;
                                                 yyextra->current_root->moveToSubEntryAndKeep(yyextra->current);
                                                 yyextra->current_root = tmp;
-                                                yyextra->current.swap(new_current);
+
+                                                yyextra->current = new_current;
                                               }
                                               // restore documentation values
                                               yyextra->current->doc       = doc;
@@ -3658,7 +3659,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					      }
 					      else
 					      {
-					        yyextra->memspecEntry = yyextra->current.get();
+					        yyextra->memspecEntry = yyextra->current;
 					        yyextra->current_root->copyToSubEntry( yyextra->current ) ;
 						if (yyextra->current->section==Entry::NAMESPACE_SEC ||
 						    (yyextra->current->spec==Entry::Interface) ||
@@ -3669,7 +3670,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
                                                   yyextra->current->reset();
                                                   yyextra->current_root = original_root; // restore scope from before namespace descent
 						  initEntry(yyscanner);
-						  yyextra->memspecEntry = 0;
+						  yyextra->memspecEntry.reset();
 						  BEGIN( FindMembers ) ;
 						}
 						else
@@ -3724,7 +3725,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					  //printf("Adding compound %s %s %s\n",yyextra->current->type.data(),yyextra->current->name.data(),yyextra->current->args.data());
 					  if (!yyextra->firstTypedefEntry)
 					  {
-					    yyextra->firstTypedefEntry = yyextra->current.get();
+					    yyextra->firstTypedefEntry = yyextra->current;
 					  }
 					  yyextra->current_root->moveToSubEntryAndRefresh( yyextra->current ) ;
 					  initEntry(yyscanner);
@@ -3740,7 +3741,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					  // add compound definition to the tree
   					  yyextra->current->args = yyextra->current->args.simplifyWhiteSpace();
   					  yyextra->current->type = yyextra->current->type.simplifyWhiteSpace();
-					  yyextra->memspecEntry = yyextra->current.get();
+					  yyextra->memspecEntry = yyextra->current;
 					  yyextra->current_root->moveToSubEntryAndRefresh( yyextra->current ) ;
 					  initEntry(yyscanner);
 					  unput(';');
@@ -3794,7 +3795,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					    // anonymous compound. If so we insert a 
 					    // special 'anonymous' variable.
 					    //Entry *p=yyextra->current_root;
-					    const Entry *p=yyextra->current.get();
+                                            const Entry *p=yyextra->current.get();
 					    while (p)
 					    {
 					      // only look for class scopes, not namespace scopes
@@ -3812,7 +3813,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 						}
 					      }
 					      //p=p->parent;
-					      if (p==yyextra->current.get()) p=yyextra->current_root; else p=p->parent();
+					      if (p==yyextra->current.get()) p=yyextra->current_root.get(); else p=p->parent();
 					    }
 					  }
 					  //printf("yyextra->msName=%s yyextra->current->name=%s\n",yyextra->msName.data(),yyextra->current->name.data());
@@ -3833,7 +3834,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					    }
 					    else // case 2: create a typedef field
 					    {
-                                              std::unique_ptr<Entry> varEntry=std::make_unique<Entry>();
+                                              std::shared_ptr<Entry> varEntry=std::make_shared<Entry>();
 					      varEntry->lang = yyextra->language;
 					      varEntry->protection = yyextra->current->protection ;
 					      varEntry->mtype = yyextra->current->mtype;
@@ -3893,8 +3894,8 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					    yyextra->msName.resize(0);
 					    yyextra->msArgs.resize(0);
 					    yyextra->isTypedef=FALSE;
-					    yyextra->firstTypedefEntry=0;
-					    yyextra->memspecEntry=0;
+					    yyextra->firstTypedefEntry.reset();
+					    yyextra->memspecEntry.reset();
 					    yyextra->current->reset();
 					    initEntry(yyscanner);
 					    BEGIN( FindMembers );
@@ -4825,7 +4826,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					    {
 					      findAndRemoveWord(yyextra->current->type,"function");
 					    }
-					    yyextra->previous = yyextra->current.get();
+					    yyextra->previous = yyextra->current;
 					    yyextra->current_root->moveToSubEntryAndRefresh(yyextra->current);
 					    initEntry(yyscanner);
 					    // Objective C 2.0: Required/Optional section
@@ -4919,9 +4920,9 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 					  {
 					    yyextra->current->endBodyLine=yyextra->yyLineNr;
                                             // take yyextra->previous out of yyextra->current_root and move it into yyextra->current
-					    yyextra->current.swap(yyextra->tempEntry); // remember yyextra->current
-                                            yyextra->current_root->moveFromSubEntry(yyextra->previous,yyextra->current);
-					    yyextra->previous = 0;
+					    yyextra->tempEntry = yyextra->current; // remember yyextra->current
+                                            yyextra->current_root->moveFromSubEntry(yyextra->previous.get(),yyextra->current);
+					    yyextra->previous.reset();
 
 					    yyextra->docBlockContext   = SkipCurlyEndDoc;
 					    yyextra->docBlockInBody    = FALSE;
@@ -4963,7 +4964,7 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
   				          //addToBody("}");
                                           if (yyextra->tempEntry) // we can only switch back to yyextra->current if no new item was created
 					  {
-					    yyextra->tempEntry.swap(yyextra->current);
+					    yyextra->current = yyextra->tempEntry;
 					    yyextra->tempEntry.reset();
 					  }
   					  BEGIN( yyextra->lastCurlyContext );
@@ -6615,8 +6616,8 @@ static void initParser(yyscan_t yyscanner)
   yyextra->insideCode=FALSE;
   yyextra->insideCli=Config_getBool(CPP_CLI_SUPPORT);
   yyextra->previous = 0;
-  yyextra->firstTypedefEntry = 0;
-  yyextra->memspecEntry =0;
+  yyextra->firstTypedefEntry.reset();
+  yyextra->memspecEntry.reset();
 }
 
 static void initEntry(yyscan_t yyscanner)
@@ -6928,13 +6929,13 @@ static void newEntry(yyscan_t yyscanner)
                     // already added to yyextra->current_root, so we should not add it again 
                     // (see bug723314)
   {
-    yyextra->previous = yyextra->current.get();
+    yyextra->previous = yyextra->current;
     yyextra->current_root->moveToSubEntryAndRefresh(yyextra->current);
   }
   else
   {
-    yyextra->previous = yyextra->current.get();
-    yyextra->tempEntry.swap(yyextra->current);
+    yyextra->previous = yyextra->current;
+    yyextra->current  = yyextra->tempEntry;
     yyextra->tempEntry.reset();
   }
   initEntry(yyscanner);
@@ -6949,7 +6950,7 @@ static void handleCommentBlock(yyscan_t yyscanner,const QCString &doc,bool brief
   int lineNr = brief ? yyextra->current->briefLine : yyextra->current->docLine;   // line of block start
 
   // fill in inbodyFile && inbodyLine the first time, see bug 633891
-  Entry *docEntry = yyextra->docBlockInBody && yyextra->previous ? yyextra->previous : yyextra->current.get();
+  std::shared_ptr<Entry> docEntry = yyextra->docBlockInBody && yyextra->previous ? yyextra->previous : yyextra->current;
   if (yyextra->docBlockInBody && docEntry && docEntry->inbodyLine==-1)
   {
     docEntry->inbodyFile = yyextra->yyFileName;
@@ -6961,7 +6962,7 @@ static void handleCommentBlock(yyscan_t yyscanner,const QCString &doc,bool brief
   QCString processedDoc = preprocessCommentBlock(stripIndentation(doc),yyextra->yyFileName,lineNr);
   while (parseCommentBlock(
 	yyextra->thisParser,
-	yyextra->docBlockInBody && yyextra->previous ? yyextra->previous : yyextra->current.get(),
+	yyextra->docBlockInBody && yyextra->previous ? yyextra->previous.get() : yyextra->current.get(),
 	processedDoc, // text
 	yyextra->yyFileName,   // file
 	lineNr,       // line of block start
@@ -7054,7 +7055,7 @@ static void handleParametersCommentBlocks(yyscan_t yyscanner,ArgumentList &al)
 
 //----------------------------------------------------------------------------
 
-static void parseCompounds(yyscan_t yyscanner,const std::unique_ptr<Entry> &rt)
+static void parseCompounds(yyscan_t yyscanner,const std::shared_ptr<Entry> &rt)
 {
   struct yyguts_t *yyg = (struct yyguts_t*)yyscanner;
   //printf("parseCompounds(%s)\n",rt->name.data());
@@ -7074,14 +7075,14 @@ static void parseCompounds(yyscan_t yyscanner,const std::unique_ptr<Entry> &rt)
 	BEGIN( FindFields ) ;
       else
 	BEGIN( FindMembers ) ;
-      yyextra->current_root = ce.get() ;
+      yyextra->current_root = ce;
       yyextra->yyFileName = ce->fileName;
       //setContext();
       yyextra->yyLineNr = ce->startLine ;
       yyextra->yyColNr = ce->startColumn ;
       yyextra->insideObjC = ce->lang==SrcLangExt_ObjC;
       //printf("---> Inner block starts at line %d objC=%d\n",yyextra->yyLineNr,yyextra->insideObjC);
-      yyextra->current = std::make_unique<Entry>();
+      yyextra->current = std::make_shared<Entry>();
       yyextra->stat = FALSE;
       initEntry(yyscanner);
 
@@ -7169,7 +7170,7 @@ static void parseCompounds(yyscan_t yyscanner,const std::unique_ptr<Entry> &rt)
 static void parseMain(yyscan_t yyscanner,
                       const char *fileName,
                       const char *fileBuf,
-                      const std::unique_ptr<Entry> &rt,
+                      const std::shared_ptr<Entry> &rt,
                       bool sameTranslationUnit,
                       QStrList & filesInSameTranslationUnit)
 {
@@ -7187,7 +7188,7 @@ static void parseMain(yyscan_t yyscanner,
   yyextra->mtype         = Method;
   yyextra->stat         = FALSE;
   yyextra->virt          = Normal;
-  yyextra->current_root  = rt.get();
+  yyextra->current_root  = rt;
   yyextra->yyLineNr= 1 ; 
   yyextra->yyFileName = fileName;
   setContext(yyscanner);
@@ -7206,10 +7207,10 @@ static void parseMain(yyscan_t yyscanner,
   rt->lang = yyextra->language;
   msg("Parsing file %s...\n",yyextra->yyFileName.data());
 
-  yyextra->current_root  = rt.get() ;
+  yyextra->current_root  = rt;
   initParser(yyscanner);
   Doxygen::docGroup.enterFile(yyextra->yyFileName,yyextra->yyLineNr);
-  yyextra->current = std::make_unique<Entry>();
+  yyextra->current = std::make_shared<Entry>();
   //printf("yyextra->current=%p yyextra->current_root=%p\n",yyextra->current,yyextra->current_root);
   int sec=guessSection(yyextra->yyFileName);
   if (sec)
@@ -7355,7 +7356,7 @@ void COutlineParser::finishTranslationUnit()
 
 void COutlineParser::parseInput(const char *fileName,
                                   const char *fileBuf,
-                                  const std::unique_ptr<Entry> &root,
+                                  const std::shared_ptr<Entry> &root,
                                   bool sameTranslationUnit,
                                   QStrList & filesInSameTranslationUnit)
 {
diff --git a/src/tagreader.cpp b/src/tagreader.cpp
index 65336e3..8f85e9d 100644
--- a/src/tagreader.cpp
+++ b/src/tagreader.cpp
@@ -909,12 +909,12 @@ class TagFileParser : public QXmlDefaultHandler
     }
 
     void dump();
-    void buildLists(const std::unique_ptr<Entry> &root);
+    void buildLists(const std::shared_ptr<Entry> &root);
     void addIncludes();
     
   private:
-    void buildMemberList(const std::unique_ptr<Entry> &ce,QList<TagMemberInfo> &members);
-    void addDocAnchors(const std::unique_ptr<Entry> &e,const TagAnchorInfoList &l);
+    void buildMemberList(const std::shared_ptr<Entry> &ce,QList<TagMemberInfo> &members);
+    void addDocAnchors(const std::shared_ptr<Entry> &e,const TagAnchorInfoList &l);
     QList<TagClassInfo>        m_tagFileClasses;
     QList<TagFileInfo>         m_tagFileFiles;
     QList<TagNamespaceInfo>    m_tagFileNamespaces;
@@ -1139,7 +1139,7 @@ void TagFileParser::dump()
   }
 }
 
-void TagFileParser::addDocAnchors(const std::unique_ptr<Entry> &e,const TagAnchorInfoList &l)
+void TagFileParser::addDocAnchors(const std::shared_ptr<Entry> &e,const TagAnchorInfoList &l)
 {
   QListIterator<TagAnchorInfo> tli(l);
   TagAnchorInfo *ta;
@@ -1161,13 +1161,13 @@ void TagFileParser::addDocAnchors(const std::unique_ptr<Entry> &e,const TagAncho
   }
 }
 
-void TagFileParser::buildMemberList(const std::unique_ptr<Entry> &ce,QList<TagMemberInfo> &members)
+void TagFileParser::buildMemberList(const std::shared_ptr<Entry> &ce,QList<TagMemberInfo> &members)
 {
   QListIterator<TagMemberInfo> mii(members);
   TagMemberInfo *tmi;
   for (;(tmi=mii.current());++mii)
   {
-    std::unique_ptr<Entry> me = std::make_unique<Entry>();
+    std::shared_ptr<Entry> me = std::make_shared<Entry>();
     me->type       = tmi->type;
     me->name       = tmi->name;
     me->args       = tmi->arglist;
@@ -1182,7 +1182,7 @@ void TagFileParser::buildMemberList(const std::unique_ptr<Entry> &ce,QList<TagMe
       TagEnumValueInfo *evi;
       for (evii.toFirst();(evi=evii.current());++evii)
       {
-        std::unique_ptr<Entry> ev = std::make_unique<Entry>();
+        std::shared_ptr<Entry> ev = std::make_shared<Entry>();
         ev->type       = "@";
         ev->name       = evi->name;
         ev->id         = evi->clangid;
@@ -1296,14 +1296,14 @@ static QCString stripPath(const QCString &s)
  *  This tree contains the information extracted from the input in a 
  *  "unrelated" form.
  */
-void TagFileParser::buildLists(const std::unique_ptr<Entry> &root)
+void TagFileParser::buildLists(const std::shared_ptr<Entry> &root)
 {
   // build class list
   QListIterator<TagClassInfo> cit(m_tagFileClasses);
   TagClassInfo *tci;
   for (cit.toFirst();(tci=cit.current());++cit)
   {
-    std::unique_ptr<Entry> ce = std::make_unique<Entry>();
+    std::shared_ptr<Entry> ce = std::make_shared<Entry>();
     ce->section = Entry::CLASS_SEC;
     switch (tci->kind)
     {
@@ -1360,7 +1360,7 @@ void TagFileParser::buildLists(const std::unique_ptr<Entry> &root)
   TagFileInfo *tfi;
   for (fit.toFirst();(tfi=fit.current());++fit)
   {
-    std::unique_ptr<Entry> fe = std::make_unique<Entry>();
+    std::shared_ptr<Entry> fe = std::make_shared<Entry>();
     fe->section = guessSection(tfi->name);
     fe->name     = tfi->name;
     addDocAnchors(fe,tfi->docAnchors);
@@ -1396,7 +1396,7 @@ void TagFileParser::buildLists(const std::unique_ptr<Entry> &root)
   TagNamespaceInfo *tni;
   for (nit.toFirst();(tni=nit.current());++nit)
   {
-    std::unique_ptr<Entry> ne = std::make_unique<Entry>();
+    std::shared_ptr<Entry> ne = std::make_shared<Entry>();
     ne->section  = Entry::NAMESPACE_SEC;
     ne->name     = tni->name;
     addDocAnchors(ne,tni->docAnchors);
@@ -1414,7 +1414,7 @@ void TagFileParser::buildLists(const std::unique_ptr<Entry> &root)
   TagPackageInfo *tpgi;
   for (pit.toFirst();(tpgi=pit.current());++pit)
   {
-    std::unique_ptr<Entry> pe = std::make_unique<Entry>();
+    std::shared_ptr<Entry> pe = std::make_shared<Entry>();
     pe->section  = Entry::PACKAGE_SEC;
     pe->name     = tpgi->name;
     addDocAnchors(pe,tpgi->docAnchors);
@@ -1431,7 +1431,7 @@ void TagFileParser::buildLists(const std::unique_ptr<Entry> &root)
   TagGroupInfo *tgi;
   for (git.toFirst();(tgi=git.current());++git)
   {
-    std::unique_ptr<Entry> ge = std::make_unique<Entry>();
+    std::shared_ptr<Entry> ge = std::make_shared<Entry>();
     ge->section  = Entry::GROUPDOC_SEC;
     ge->name     = tgi->name;
     ge->type     = tgi->title;
@@ -1455,7 +1455,7 @@ void TagFileParser::buildLists(const std::unique_ptr<Entry> &root)
       //for (eli.toFirst();(childNode=eli.current());++eli)
       const auto &children = root->children();
       auto i = std::find_if(children.begin(),children.end(),
-          [&](const std::unique_ptr<Entry> &e) { return e->name = *it; });
+          [&](const std::shared_ptr<Entry> &e) { return e->name = *it; });
       if (i!=children.end())
       {
         (*i)->groups.push_back(Grouping(tgi->name,Grouping::GROUPING_INGROUP));
@@ -1468,7 +1468,7 @@ void TagFileParser::buildLists(const std::unique_ptr<Entry> &root)
   TagPageInfo *tpi;
   for (pgit.toFirst();(tpi=pgit.current());++pgit)
   {
-    std::unique_ptr<Entry> pe = std::make_unique<Entry>();
+    std::shared_ptr<Entry> pe = std::make_shared<Entry>();
     pe->section  = tpi->filename=="index" ? Entry::MAINPAGEDOC_SEC : Entry::PAGEDOC_SEC;
     pe->name     = tpi->name;
     pe->args     = tpi->title;
@@ -1527,7 +1527,7 @@ void TagFileParser::addIncludes()
   }
 }
 
-void parseTagFile(const std::unique_ptr<Entry> &root,const char *fullName)
+void parseTagFile(const std::shared_ptr<Entry> &root,const char *fullName)
 {
   QFileInfo fi(fullName);
   if (!fi.exists()) return;
diff --git a/src/tagreader.h b/src/tagreader.h
index 4c09a04..454060b 100644
--- a/src/tagreader.h
+++ b/src/tagreader.h
@@ -23,6 +23,6 @@ class Entry;
 
 #include <memory>
 
-void parseTagFile(const std::unique_ptr<Entry> &root,const char *fullPathName);
+void parseTagFile(const std::shared_ptr<Entry> &root,const char *fullPathName);
 
 #endif
diff --git a/src/tclscanner.h b/src/tclscanner.h
index 52ff903..cdd56d8 100644
--- a/src/tclscanner.h
+++ b/src/tclscanner.h
@@ -32,7 +32,7 @@ class TclOutlineParser : public OutlineParserInterface
     void finishTranslationUnit() {}
     void parseInput(const char *fileName,
                     const char *fileBuf,
-                    const std::unique_ptr<Entry> &root,
+                    const std::shared_ptr<Entry> &root,
                     bool sameTranslationUnit,
                     QStrList &filesInSameTranslationUnit);
     bool needsPreprocessing(const QCString &extension) const;
diff --git a/src/tclscanner.l b/src/tclscanner.l
index e3fd6f2..49c0807 100644
--- a/src/tclscanner.l
+++ b/src/tclscanner.l
@@ -2966,7 +2966,7 @@ static void tcl_parse(const QCString ns, const QCString cls)
 //! Parse text file and build up entry tree.
 void TclOutlineParser::parseInput(const char *fileName,
                                     const char *input,
-                                    const std::unique_ptr<Entry> &root,
+                                    const std::shared_ptr<Entry> &root,
                                     bool /*sameTranslationUnit*/,
                                     QStrList & /*filesInSameTranslationUnit*/)
 {
diff --git a/src/vhdldocgen.cpp b/src/vhdldocgen.cpp
index ba4d4de..dc39321 100644
--- a/src/vhdldocgen.cpp
+++ b/src/vhdldocgen.cpp
@@ -72,7 +72,7 @@ static void initUCF(Entry* root,const char* type,QCString &  qcs,int line,QCStri
 static void writeUCFLink(const MemberDef* mdef,OutputList &ol);
 static void assignBinding(VhdlConfNode* conf);
 static void addInstance(ClassDef* entity, ClassDef* arch, ClassDef *inst,
-                        const std::unique_ptr<Entry> &cur);
+                        const std::shared_ptr<Entry> &cur);
 
 //---------- create svg -------------------------------------------------------------
 static void createSVG();
@@ -2535,7 +2535,7 @@ static void initUCF(Entry* root,const char*  type,QCString &  qcs,int line,QCStr
 
   qcs.stripPrefix("=");
 
-  std::unique_ptr<Entry> current = std::make_unique<Entry>();
+  std::shared_ptr<Entry> current = std::make_shared<Entry>();
   current->spec=VhdlDocGen::UCF_CONST;
   current->section=Entry::VARIABLE_SEC;
   current->bodyLine=line;
@@ -2900,7 +2900,7 @@ void VhdlDocGen::computeVhdlComponentRelations()
 }
 
 static void addInstance(ClassDef* classEntity, ClassDef* ar,
-                        ClassDef *cd , const std::unique_ptr<Entry> &cur)
+                        ClassDef *cd , const std::shared_ptr<Entry> &cur)
 {
 
   QCString bName,n1;
@@ -3136,7 +3136,7 @@ void VhdlDocGen::createFlowChart(const MemberDef *mdef)
 
   VHDLOutlineParser &intf =dynamic_cast<VHDLOutlineParser&>(Doxygen::parserManager->getOutlineParser(".vhd"));
   VhdlDocGen::setFlowMember(mdef);
-  std::unique_ptr<Entry> root = std::make_unique<Entry>();
+  std::shared_ptr<Entry> root = std::make_shared<Entry>();
   QStrList filesInSameTu;
   intf.startTranslationUnit("");
   intf.parseInput("",codeFragment.data(),root,FALSE,filesInSameTu);
diff --git a/src/vhdljjparser.cpp b/src/vhdljjparser.cpp
index 874980b..8b7ebf6 100644
--- a/src/vhdljjparser.cpp
+++ b/src/vhdljjparser.cpp
@@ -48,16 +48,15 @@ static Entry* oldEntry;
 static bool varr=FALSE;
 static QCString varName;
 
-static std::vector< std::unique_ptr<Entry> > instFiles;
-static std::vector< std::unique_ptr<Entry> > libUse;
+static std::vector< std::shared_ptr<Entry> > instFiles;
+static std::vector< std::shared_ptr<Entry> > libUse;
 static std::vector<Entry*> lineEntry;
 
-Entry*   VhdlParser::currentCompound=0;
 Entry*   VhdlParser::tempEntry=0;
 Entry*   VhdlParser::lastEntity=0  ;
 Entry*   VhdlParser::lastCompound=0  ;
 Entry*   VhdlParser::current_root  = 0;
-std::unique_ptr<Entry> VhdlParser::current=0;
+std::shared_ptr<Entry> VhdlParser::current=0;
 QCString VhdlParser::compSpec;
 QCString VhdlParser::currName;
 QCString VhdlParser::confName;
@@ -90,7 +89,7 @@ static void insertEntryAtLine(const Entry* ce,int line);
 //-------------------------------------
 
 const QList<VhdlConfNode>& getVhdlConfiguration() { return  configL; }
-const std::vector<std::unique_ptr<Entry> > &getVhdlInstList() { return  instFiles; }
+const std::vector<std::shared_ptr<Entry> > &getVhdlInstList() { return  instFiles; }
 
 Entry* getVhdlCompound()
 {
@@ -106,7 +105,7 @@ bool isConstraintFile(const QCString &fileName,const QCString &ext)
 
 
 void VHDLOutlineParser::parseInput(const char *fileName,const char *fileBuf,
-                          const std::unique_ptr<Entry> &root, bool ,QStrList&)
+                          const std::shared_ptr<Entry> &root, bool ,QStrList&)
 {
   g_thisParser=this;
   bool inLine=false;
@@ -140,10 +139,9 @@ void VHDLOutlineParser::parseInput(const char *fileName,const char *fileBuf,
   VhdlParser::current_root=root.get();
   VhdlParser::lastCompound=0;
   VhdlParser::lastEntity=0;
-  VhdlParser::currentCompound=0;
   VhdlParser::lastEntity=0;
   oldEntry = 0;
-  VhdlParser::current=std::make_unique<Entry>();
+  VhdlParser::current=std::make_shared<Entry>();
   VhdlParser::initEntry(VhdlParser::current.get());
   Doxygen::docGroup.enterFile(fileName,yyLineNr);
   vhdlFileName = fileName;
@@ -355,10 +353,10 @@ void VhdlParser::addCompInst(const char *n, const char* instName, const char* co
     if (true) // !findInstant(current->type))
     {
       initEntry(current.get());
-      instFiles.emplace_back(std::make_unique<Entry>(*current));
+      instFiles.emplace_back(std::make_shared<Entry>(*current));
     }
 
-    current=std::make_unique<Entry>();
+    current=std::make_shared<Entry>();
   }
   else
   {
@@ -396,7 +394,7 @@ void VhdlParser::addVhdlType(const char *n,int startLine,int section,
 
     if (!lastCompound && (section==Entry::VARIABLE_SEC) &&  (spec == VhdlDocGen::USE || spec == VhdlDocGen::LIBRARY) )
     {
-      libUse.emplace_back(std::make_unique<Entry>(*current));
+      libUse.emplace_back(std::make_shared<Entry>(*current));
       current->reset();
     }
     newEntry();
diff --git a/src/vhdljjparser.h b/src/vhdljjparser.h
index faa0c08..f987e4a 100644
--- a/src/vhdljjparser.h
+++ b/src/vhdljjparser.h
@@ -47,7 +47,7 @@ class VHDLOutlineParser : public OutlineParserInterface
     void finishTranslationUnit() {}
     void parseInput(const char * fileName,
                     const char *fileBuf,
-                    const std::unique_ptr<Entry> &root,
+                    const std::shared_ptr<Entry> &root,
                     bool sameTranslationUnit,
                     QStrList &filesInSameTranslationUnit);
 
@@ -82,6 +82,6 @@ struct VhdlConfNode
 void vhdlscanFreeScanner();
 
 const QList<VhdlConfNode>& getVhdlConfiguration();
-const std::vector<std::unique_ptr<Entry> >&getVhdlInstList();
+const std::vector<std::shared_ptr<Entry> >&getVhdlInstList();
 
 #endif
diff --git a/vhdlparser/VhdlParser.cc b/vhdlparser/VhdlParser.cc
index 2ed30e2..35f2ff6 100644
--- a/vhdlparser/VhdlParser.cc
+++ b/vhdlparser/VhdlParser.cc
@@ -5891,7 +5891,7 @@ void VhdlParser::package_declaration() {QCString s;
     }
     if (!hasError) {
 lastCompound=current.get();
-                          std::unique_ptr<Entry> clone=std::make_unique<Entry>(*current);
+                          std::shared_ptr<Entry> clone=std::make_shared<Entry>(*current);
                           clone->section=Entry::NAMESPACE_SEC;
                           clone->spec=VhdlDocGen::PACKAGE;
                           clone->name=s;
diff --git a/vhdlparser/VhdlParser.h b/vhdlparser/VhdlParser.h
index a9f14d1..b88f156 100644
--- a/vhdlparser/VhdlParser.h
+++ b/vhdlparser/VhdlParser.h
@@ -8426,7 +8426,7 @@ static Entry* current_root;
 static Entry* tempEntry;
 static Entry*  lastEntity  ;
 static Entry*  lastCompound  ;
-static std::unique_ptr<Entry> current;
+static std::shared_ptr<Entry> current;
 static QCString compSpec;
 static QCString currName;
 static int levelCounter;
@@ -8437,7 +8437,6 @@ static QCString forL;
 static int param_sec ;
 static int parse_sec;
 static int currP;
-static Entry* currentCompound;
 
 //----------------------------------------
 
diff --git a/vhdlparser/vhdlparser.jj b/vhdlparser/vhdlparser.jj
index a3d6731..c602396 100644
--- a/vhdlparser/vhdlparser.jj
+++ b/vhdlparser/vhdlparser.jj
@@ -31,7 +31,7 @@ static Entry* current_root;
 static Entry* tempEntry;
 static Entry*  lastEntity  ;
 static Entry*  lastCompound  ;
-static std::unique_ptr<Entry> current;
+static std::shared_ptr<Entry> current;
 static QCString compSpec;
 static QCString currName;
 static int levelCounter;
@@ -42,7 +42,6 @@ static QCString forL;
 static int param_sec ;
 static int parse_sec;
 static int currP;
-static Entry* currentCompound;
 
 //----------------------------------------
 
@@ -1730,7 +1729,7 @@ void package_declaration():  {QCString s;}
  <PACKAGE_T> s=identifier() <IS_T>
                           {
                           lastCompound=current.get();
-                          std::unique_ptr<Entry> clone=std::make_unique<Entry>(*current);
+                          std::shared_ptr<Entry> clone=std::make_shared<Entry>(*current);
                           clone->section=Entry::NAMESPACE_SEC;
                           clone->spec=VhdlDocGen::PACKAGE;
                           clone->name=s;