got rid of double-free conditions and segfault

yab2cpp.h

@@ -312,8 +312,7 @@ public:
 	virtual void close();
 
 	explicit ifStatement(expression *e);
-	virtual ~ifStatement()
+	virtual ~ifStatement();
-	{}
 };
 
 /* looping constructs */
@@ -326,8 +325,7 @@ public:
 	virtual void close(expression *e);
 
 	explicit repeatLoop();
-	virtual ~repeatLoop()
+	virtual ~repeatLoop();
-	{}
 };
 
 class doLoop:public codeType
@@ -339,8 +337,7 @@ public:
 	virtual void close();
 
 	explicit doLoop();
-	virtual ~doLoop()
+	virtual ~doLoop();
-	{}
 };
 
 class whileLoop:public codeType
@@ -354,8 +351,7 @@ public:
 	virtual void close();
 
 	explicit whileLoop(expression *e);
-	virtual ~whileLoop()
+	virtual ~whileLoop();
-	{}
 };
 
 class variableType:public operands
@@ -401,8 +397,7 @@ public:
 
 	explicit forLoop(variableType *v, expression *start, expression *stop,
 		expression *stepVal=nullptr);
-	virtual ~forLoop()
+	virtual ~forLoop();
-	{}
 };
 
 class fn:codeType

yabCodeStructures.cpp

@@ -140,6 +140,7 @@ void ifStatement::alternative(expression *e)
 {
 	done->generateJumpTo();
 	this->chain->generate();
+	delete this->chain;
 	this->chain=nullptr;
 	if(e!=nullptr)
 	{
@@ -156,6 +157,12 @@ void ifStatement::close()
 	this->done->generate();
 }
 
+ifStatement::~ifStatement()
+{
+	delete this->redo;
+	delete this->done;
+}
+
 /* Loop definitions */
 repeatLoop::repeatLoop():codeType(T_REPEATLOOP)
 {
@@ -176,6 +183,12 @@ void repeatLoop::close(expression *e)
 	loopEnd->generate();
 }
 
+repeatLoop::~repeatLoop()
+{
+	delete loopStart;
+	delete loopEnd;
+}
+
 doLoop::doLoop():codeType(T_DOLOOP)
 {
 	this->loopStart=new label();
@@ -194,6 +207,12 @@ void doLoop::close()
 	this->loopEnd->generate();
 }
 
+doLoop::~doLoop()
+{
+	delete loopStart;
+	delete loopEnd;
+}
+
 whileLoop::whileLoop(expression *e):codeType(T_WHILELOOP)
 {
 	loopContinue=new label();
@@ -216,6 +235,14 @@ void whileLoop::close()
 	loopEnd->generate();
 }
 
+whileLoop::~whileLoop() 
+{
+	delete loopContinue;
+	delete loopStart;
+	delete loopEnd;
+}
+
+
 forLoop::forLoop(variableType *v, expression *start, expression *stop,
 	expression *stepVal):codeType(T_FORLOOP)
 {
@@ -267,3 +294,10 @@ void forLoop::close()
 	var->assignment(stepper);
 	infrastructure->close();
 }
+
+forLoop::~forLoop()
+{
+	delete startTemp;
+	delete stopTemp;
+	delete infrastructure;
+}

yabDataStructures.cpp

@@ -448,8 +448,11 @@ operands *expression::evaluate()
 	this->oper=O_TERM;
 	l->dispose();
 	delete left;
-	r->dispose();
+	if (getRight()!=nullptr)
-	delete right;
+	{
+		r->dispose();
+		delete right;
+	}
 	return this->op;
 }