Fix SEGV when hovering on symbols after creating a new project. This resolves issue #40.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 46b407f26cf98c494f646609a37d03be4c41e11a)

2 files changed, 75 insertions, 68 deletions

diff --git a/languages/cpp/cppcodecompletion.cpp b/languages/cpp/cppcodecompletion.cpp
index 7f97ba1e..d09602c0 100644
--- a/languages/cpp/cppcodecompletion.cpp
+++ b/languages/cpp/cppcodecompletion.cpp
@@ -2050,14 +2050,13 @@ void CppCodeCompletion::needRecoveryPoints() {
 
   if ( this->d->recoveryPoints.isEmpty() ) {
     kdDebug( 9007 ) << "missing recovery-points for file " << m_activeFileName << " they have to be computed now" << endl;
-    m_pSupport->backgroundParser() ->lock ()
-    ;
+    m_pSupport->backgroundParser() ->lock();
 
     std::vector<CppCodeCompletion> vec;
 
-	  TranslationUnitAST * ast = *m_pSupport->backgroundParser() ->translationUnit( m_activeFileName );
+	  ParsedFilePointer pTransUnit = m_pSupport->backgroundParser() ->translationUnit( m_activeFileName );
     m_pSupport->backgroundParser() ->unlock();
-    if ( !ast ) {
+    if ( !pTransUnit ) {
       kdDebug( 9007 ) << "background-parser is missing the translation-unit. The file needs to be reparsed." << endl;
 	    m_pSupport->parseFileAndDependencies( m_activeFileName, true );
 // 	    m_pSupport->mainWindow() ->statusBar() ->message( i18n( "Background-parser is missing the necessary translation-unit. It will be computed, but this completion will fail." ).arg( m_activeFileName ), 2000 );
@@ -2684,70 +2683,74 @@ void CppCodeCompletion::completeText( bool invokedOnDemand /*= false*/ ) {
 
 	///@todo is all this necessary?
   if ( !recoveredDecl.get() && !recoveredTypeSpec.get() ) {
-    TranslationUnitAST * ast = *m_pSupport->backgroundParser() ->translationUnit( m_activeFileName );
-    if ( AST * node = findNodeAt( ast, line, column ) ) {
-      kdDebug( 9007 ) << "------------------- AST FOUND --------------------" << endl;
-      kdDebug( 9007 ) << "node-kind = " << nodeTypeToString( node->nodeType() ) << endl;
+    ParsedFilePointer pTransUnit = m_pSupport->backgroundParser() ->translationUnit(m_activeFileName);
+    if (pTransUnit)
+    {
+      TranslationUnitAST *ast = *pTransUnit;
+      if ( AST * node = findNodeAt( ast, line, column ) ) {
+        kdDebug( 9007 ) << "------------------- AST FOUND --------------------" << endl;
+        kdDebug( 9007 ) << "node-kind = " << nodeTypeToString( node->nodeType() ) << endl;
 
-      if ( FunctionDefinitionAST * def = functionDefinition( node ) ) {
-        kdDebug( 9007 ) << "------> found a function definition" << endl;
+        if ( FunctionDefinitionAST * def = functionDefinition( node ) ) {
+          kdDebug( 9007 ) << "------> found a function definition" << endl;
 
-        int startLine, startColumn;
-        def->getStartPosition( &startLine, &startColumn );
+          int startLine, startColumn;
+          def->getStartPosition( &startLine, &startColumn );
 
-        TQString contents = getText( startLine, startColumn, line, showArguments ? nCol : column );
+          TQString contents = getText( startLine, startColumn, line, showArguments ? nCol : column );
 
 
-        /// @todo remove code duplication
-        int start_expr = expressionAt( contents, contents.length() );
+          /// @todo remove code duplication
+          int start_expr = expressionAt( contents, contents.length() );
 
-        // kdDebug(9007) << "start_expr = " << start_expr << endl;
-        if ( start_expr != int( contents.length() ) )
-          expr = contents.mid( start_expr, contents.length() - start_expr ).stripWhiteSpace();
+          // kdDebug(9007) << "start_expr = " << start_expr << endl;
+          if ( start_expr != int( contents.length() ) )
+            expr = contents.mid( start_expr, contents.length() - start_expr ).stripWhiteSpace();
 
-        if ( expr.startsWith( "TQ_SIGNAL" ) || expr.startsWith( "TQ_SLOT" ) ) {
-          m_completionMode = expr.startsWith( "TQ_SIGNAL" ) ? SignalCompletion : SlotCompletion;
+          if ( expr.startsWith( "TQ_SIGNAL" ) || expr.startsWith( "TQ_SLOT" ) ) {
+            m_completionMode = expr.startsWith( "TQ_SIGNAL" ) ? SignalCompletion : SlotCompletion;
 
-          showArguments = false;
-          int end_expr = start_expr - 1;
-          while ( end_expr > 0 && contents[ end_expr ].isSpace() )
-            --end_expr;
+            showArguments = false;
+            int end_expr = start_expr - 1;
+            while ( end_expr > 0 && contents[ end_expr ].isSpace() )
+              --end_expr;
 
-          if ( contents[ end_expr ] != ',' ) {
-            expr = TQString();
+            if ( contents[ end_expr ] != ',' ) {
+              expr = TQString();
+            } else {
+              start_expr = expressionAt( contents, end_expr );
+              expr = contents.mid( start_expr, end_expr - start_expr ).stripWhiteSpace();
+            }
           } else {
-            start_expr = expressionAt( contents, end_expr );
-            expr = contents.mid( start_expr, end_expr - start_expr ).stripWhiteSpace();
-          }
-        } else {
-          int idx = expr.length() - 1;
-          while ( expr[ idx ].isLetterOrNumber() || expr[ idx ] == '_' )
-            --idx;
-
-          if ( idx != int( expr.length() ) - 1 ) {
-            ++idx;
-            word = expr.mid( idx ).stripWhiteSpace();
-            expr = expr.left( idx ).stripWhiteSpace();
+            int idx = expr.length() - 1;
+            while ( expr[ idx ].isLetterOrNumber() || expr[ idx ] == '_' )
+              --idx;
+
+            if ( idx != int( expr.length() ) - 1 ) {
+              ++idx;
+              word = expr.mid( idx ).stripWhiteSpace();
+              expr = expr.left( idx ).stripWhiteSpace();
+            }
           }
-        }
 
-        ctx = computeContext( def, line, column, startLine, startColumn );
+          ctx = computeContext( def, line, column, startLine, startColumn );
 
-        TQStringList scope;
-        scopeOfNode( def, scope );
-	      this_type = SimpleType( scope, getIncludeFiles() );
+          TQStringList scope;
+          scopeOfNode( def, scope );
+          this_type = SimpleType( scope, getIncludeFiles() );
 
-        if ( scope.size() ) { /*
-                                                                      					SimpleVariable var;
-                                                                      					var.type = scope;
-                                                                      					var.name = "this";
-                                                                      					ctx->add( var );*/
-          //kdDebug(9007) << "add variable " << var.name << " with type " << var.type << endl;
-        }
+          if ( scope.size() ) { /*
+                                                                                  SimpleVariable var;
+                                                                                  var.type = scope;
+                                                                                  var.name = "this";
+                                                                                  ctx->add( var );*/
+            //kdDebug(9007) << "add variable " << var.name << " with type " << var.type << endl;
+          }
 
-        ExpressionInfo exp( expr );
-        exp.t = ( ExpressionInfo::Type ) ( ExpressionInfo::NormalExpression | ExpressionInfo::TypeExpression );
-        type = evaluateExpression( exp, ctx );
+          ExpressionInfo exp( expr );
+          exp.t = ( ExpressionInfo::Type ) ( ExpressionInfo::NormalExpression | ExpressionInfo::TypeExpression );
+          type = evaluateExpression( exp, ctx );
+        }
       }
     }
   }
diff --git a/languages/cpp/cppsupportpart.cpp b/languages/cpp/cppsupportpart.cpp
index 01b34a43..c94539de 100644
--- a/languages/cpp/cppsupportpart.cpp
+++ b/languages/cpp/cppsupportpart.cpp
@@ -1699,25 +1699,29 @@ void CppSupportPart::slotNeedTextHint( int line, int column, TQString& textHint
 		return ;
 
 	m_backgroundParser->lock();
-	TranslationUnitAST* ast = *m_backgroundParser->translationUnit( m_activeFileName );
-	AST* node = 0;
-	if ( ast && ( node = findNodeAt( ast, line, column ) ) )
+	ParsedFilePointer pTransUnit = m_backgroundParser->translationUnit(m_activeFileName);
+	if (pTransUnit)
 	{
+		TranslationUnitAST* ast = *pTransUnit;
+		AST* node = 0;
+		if ( ast && ( node = findNodeAt( ast, line, column ) ) )
+		{
 
-		while ( node && node->nodeType() != NodeType_FunctionDefinition )
-			node = node->parent();
+			while ( node && node->nodeType() != NodeType_FunctionDefinition )
+				node = node->parent();
 
-		if ( node )
-		{
-			int startLine, startColumn;
-			int endLine, endColumn;
-			node->getStartPosition( &startLine, &startColumn );
-			node->getEndPosition( &endLine, &endColumn );
+			if ( node )
+			{
+				int startLine, startColumn;
+				int endLine, endColumn;
+				node->getStartPosition( &startLine, &startColumn );
+				node->getEndPosition( &endLine, &endColumn );
 
-			if ( !node->text().isNull() )
-				textHint = node->text();
-			else
-				textHint = m_activeEditor->textLine( startLine ).simplifyWhiteSpace();
+				if ( !node->text().isNull() )
+					textHint = node->text();
+				else
+					textHint = m_activeEditor->textLine( startLine ).simplifyWhiteSpace();
+			}
 		}
 	}
 	m_backgroundParser->unlock();