Close all memory leaks.

Monicelli.y

@@ -6,6 +6,9 @@ extern int yylex();
 
 #include "Nodes.hpp"
 
+// For free()
+#include <cstdlib>
+
 using namespace monicelli;
 
 extern Program *program;
@@ -128,6 +131,7 @@ fun_decl:
         $$ = new Function(new Id($2), paramsStack.top(), stmtStack.top());
         paramsStack.pop();
         stmtStack.pop();
+        free($2);
     }
 ;
 args:
@@ -189,7 +193,14 @@ numeric:
     NUMBER { $$ = new Integer($1); } | FLOAT { $$ = new Float($1); }
 ;
 variable:
-    ID { $$ = new Id($1); } | ARTICLE ID { $$ = new Id($2); }
+    ID {
+        $$ = new Id($1);
+        free($1);
+    }
+    | ARTICLE ID {
+        $$ = new Id($2);
+        free($2);
+    }
 ;
 assign_stmt:
     variable ASSIGN expression {
@@ -262,6 +273,7 @@ fun_call:
     ID call_args FUN_END {
         $$ = new FunctionCall(new Id($3), argsStack.top());
         argsStack.pop();
+        free($3);
     }
 ;
 call_args:

Nodes.hpp

@@ -23,19 +23,31 @@ public:
 
 
 class Statement: public Emittable {
+public:
+    virtual ~Statement() {}
 };
 
 
 class SemiExpression: public Emittable {
+public:
+    virtual ~SemiExpression() {}
 };
 
 
 class Expression: public Emittable {
+public:
+    virtual ~Expression() {}
 };
 
 
 class StatementList: public std::vector<Statement*>, public Emittable {
 public:
+    virtual ~StatementList() {
+        for (Statement *s: *this) {
+            delete s;
+        }
+    }
+
     virtual void emit(std::ostream &stream, int indent = 0);
 };
 
@@ -55,6 +67,12 @@ public:
         }
     }
 
+    virtual ~ListEmittable() {
+        for (T e: *this) {
+            delete e;
+        }
+    }
+
 protected:
     virtual std::string getSeparator() const {
         return ", ";
@@ -73,6 +91,8 @@ class SimpleExpression: public Expression {
 class Id: public SimpleExpression {
 public:
     explicit Id(const char *c): value(c) {}
+    virtual ~Id() {}
+
     virtual void emit(std::ostream &stream, int indent = 0);
 
 private: