Fix possible crash when parsing layout qualifiers nodes.

Task-number: QTCREATORBUG-4563
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

src/libs/glsl/glsl.g

@@ -290,11 +290,11 @@ public:
             List<ExpressionAST *> *arguments;
         } function;
         int qualifier;
-        LayoutQualifier *layout;
-        List<LayoutQualifier *> *layout_list;
+        LayoutQualifierAST *layout;
+        List<LayoutQualifierAST *> *layout_list;
         struct {
             int qualifier;
-            List<LayoutQualifier *> *layout_list;
+            List<LayoutQualifierAST *> *layout_list;
         } type_qualifier;
         struct {
             TypeAST *type;
@@ -1394,7 +1394,7 @@ case $rule_number: {
     ast(1) = makeAstNode<ParameterDeclarationAST>
         (makeAstNode<QualifiedTypeAST>
             (sym(1).qualifier, sym(3).param_declarator.type,
-             (List<LayoutQualifier *> *)0),
+             (List<LayoutQualifierAST *> *)0),
          ParameterDeclarationAST::Qualifier(sym(2).qualifier),
          sym(3).param_declarator.name);
 }   break;
@@ -1415,7 +1415,7 @@ parameter_declaration ::= parameter_type_qualifier parameter_qualifier parameter
 case $rule_number: {
     ast(1) = makeAstNode<ParameterDeclarationAST>
         (makeAstNode<QualifiedTypeAST>
-            (sym(1).qualifier, type(3), (List<LayoutQualifier *> *)0),
+            (sym(1).qualifier, type(3), (List<LayoutQualifierAST *> *)0),
          ParameterDeclarationAST::Qualifier(sym(2).qualifier),
          (const QString *)0);
 }   break;
@@ -1605,7 +1605,7 @@ case $rule_number: {
 fully_specified_type ::= type_specifier ;
 /.
 case $rule_number: {
-    ast(1) = makeAstNode<QualifiedTypeAST>(0, type(1), (List<LayoutQualifier *> *)0);
+    ast(1) = makeAstNode<QualifiedTypeAST>(0, type(1), (List<LayoutQualifierAST *> *)0);
 }   break;
 ./
 
@@ -1656,28 +1656,28 @@ case $rule_number: {
 layout_qualifier_id_list ::= layout_qualifier_id ;
 /.
 case $rule_number: {
-    sym(1).layout_list = makeAstNode< List<LayoutQualifier *> >(sym(1).layout);
+    sym(1).layout_list = makeAstNode< List<LayoutQualifierAST *> >(sym(1).layout);
 }   break;
 ./
 
 layout_qualifier_id_list ::= layout_qualifier_id_list COMMA layout_qualifier_id ;
 /.
 case $rule_number: {
-    sym(1).layout_list = makeAstNode< List<LayoutQualifier *> >(sym(1).layout_list, sym(3).layout);
+    sym(1).layout_list = makeAstNode< List<LayoutQualifierAST *> >(sym(1).layout_list, sym(3).layout);
 }   break;
 ./
 
 layout_qualifier_id ::= IDENTIFIER ;
 /.
 case $rule_number: {
-    sym(1).layout = makeAstNode<LayoutQualifier>(string(1), (const QString *)0);
+    sym(1).layout = makeAstNode<LayoutQualifierAST>(string(1), (const QString *)0);
 }   break;
 ./
 
 layout_qualifier_id ::= IDENTIFIER EQUAL NUMBER ;
 /.
 case $rule_number: {
-    sym(1).layout = makeAstNode<LayoutQualifier>(string(1), string(3));
+    sym(1).layout = makeAstNode<LayoutQualifierAST>(string(1), string(3));
 }   break;
 ./
 

src/libs/glsl/glslast.cpp

@@ -354,6 +354,13 @@ List<StructTypeAST::Field *> *StructTypeAST::fixInnerTypes(TypeAST *innerType, L
     return fields;
 }
 
+void LayoutQualifierAST::accept0(Visitor *visitor)
+{
+    if (visitor->visit(this)) {
+    }
+    visitor->endVisit(this);
+}
+
 void QualifiedTypeAST::accept0(Visitor *visitor)
 {
     if (visitor->visit(this))

src/libs/glsl/glslast.h

@@ -69,6 +69,7 @@ class BasicTypeAST;
 class NamedTypeAST;
 class ArrayTypeAST;
 class StructTypeAST;
+class LayoutQualifierAST;
 class QualifiedTypeAST;
 class DeclarationAST;
 class PrecisionDeclarationAST;
@@ -214,6 +215,7 @@ public:
         Kind_StructType,
         Kind_AnonymousStructType,
         Kind_StructField,
+        Kind_LayoutQualifier,
         Kind_QualifiedType,
 
         // Declarations
@@ -260,6 +262,7 @@ public:
     virtual ArrayTypeAST *asArrayType() { return 0; }
     virtual StructTypeAST *asStructType() { return 0; }
     virtual QualifiedTypeAST *asQualifiedType() { return 0; }
+    virtual LayoutQualifierAST *asLayoutQualifier() { return 0; }
 
     virtual DeclarationAST *asDeclaration() { return 0; }
     virtual PrecisionDeclarationAST *asPrecisionDeclaration() { return 0; }
@@ -785,22 +788,24 @@ public: // attributes
     List<Field *> *fields;
 };
 
-class GLSL_EXPORT LayoutQualifier
+class GLSL_EXPORT LayoutQualifierAST: public AST
 {
 public:
-    LayoutQualifier(const QString *_name, const QString *_number)
-        : name(_name), number(_number), lineno(0) {}
+    LayoutQualifierAST(const QString *_name, const QString *_number)
+        : AST(Kind_LayoutQualifier), name(_name), number(_number) {}
+
+    virtual LayoutQualifierAST *asLayoutQualifier() { return this; }
+    virtual void accept0(Visitor *visitor);
 
 public: // attributes
     const QString *name;
     const QString *number;
-    int lineno;
 };
 
 class GLSL_EXPORT QualifiedTypeAST: public TypeAST
 {
 public:
-    QualifiedTypeAST(int _qualifiers, TypeAST *_type, List<LayoutQualifier *> *_layout_list)
+    QualifiedTypeAST(int _qualifiers, TypeAST *_type, List<LayoutQualifierAST *> *_layout_list)
         : TypeAST(Kind_QualifiedType), qualifiers(_qualifiers), type(_type)
         , layout_list(finish(_layout_list)) {}
 
@@ -840,7 +845,7 @@ public:
 public: // attributes
     int qualifiers;
     TypeAST *type;
-    List<LayoutQualifier *> *layout_list;
+    List<LayoutQualifierAST *> *layout_list;
 };
 
 class GLSL_EXPORT DeclarationAST: public AST

src/libs/glsl/glslastvisitor.h

@@ -129,6 +129,9 @@ public:
     virtual bool visit(StructTypeAST::Field *) { return true; }
     virtual void endVisit(StructTypeAST::Field *) {}
 
+    virtual bool visit(LayoutQualifierAST *) { return true; }
+    virtual void endVisit(LayoutQualifierAST *) {}
+
     virtual bool visit(QualifiedTypeAST *) { return true; }
     virtual void endVisit(QualifiedTypeAST *) {}
 

src/libs/glsl/glslparser.h

@@ -1,5 +1,5 @@
 
-#line 218 "./glsl.g"
+#line 217 "./glsl.g"
 
 /**************************************************************************
 **
@@ -76,11 +76,11 @@ public:
             List<ExpressionAST *> *arguments;
         } function;
         int qualifier;
-        LayoutQualifier *layout;
-        List<LayoutQualifier *> *layout_list;
+        LayoutQualifierAST *layout;
+        List<LayoutQualifierAST *> *layout_list;
         struct {
             int qualifier;
-            List<LayoutQualifier *> *layout_list;
+            List<LayoutQualifierAST *> *layout_list;
         } type_qualifier;
         struct {
             TypeAST *type;

src/libs/glsl/glslparsertable.cpp

@@ -6,6 +6,7 @@
 **
 ** Contact: Nokia Corporation (info@qt.nokia.com)
 **
+**
 ** GNU Lesser General Public License Usage
 **
 ** This file may be used under the terms of the GNU Lesser General Public
@@ -29,7 +30,6 @@
 **
 **************************************************************************/
 
-
 // This file was generated by qlalr - DO NOT EDIT!
 #include "glslparsertable_p.h"
 

src/libs/glsl/glslparsertable_p.h

@@ -6,6 +6,7 @@
 **
 ** Contact: Nokia Corporation (info@qt.nokia.com)
 **
+**
 ** GNU Lesser General Public License Usage
 **
 ** This file may be used under the terms of the GNU Lesser General Public

src/libs/glsl/glslsemantic.cpp

@@ -786,8 +786,8 @@ bool Semantic::visit(StructTypeAST *ast)
 bool Semantic::visit(QualifiedTypeAST *ast)
 {
     _type = type(ast->type);
-    for (List<LayoutQualifier *> *it = ast->layout_list; it; it = it->next) {
-        LayoutQualifier *q = it->value;
+    for (List<LayoutQualifierAST *> *it = ast->layout_list; it; it = it->next) {
+        LayoutQualifierAST *q = it->value;
         // q->name;
         // q->number;
         Q_UNUSED(q);