--- linuxsampler/trunk/src/scriptvm/tree.h	2017/06/27 22:19:19	3293
+++ linuxsampler/trunk/src/scriptvm/tree.h	2019/08/30 12:39:18	3583
@@ -1,6 +1,6 @@
 /*                                                              -*- c++ -*-
  *
- * Copyright (c) 2014 - 2017 Christian Schoenebeck and Andreas Persson
+ * Copyright (c) 2014 - 2019 Christian Schoenebeck and Andreas Persson
  *
  * http://www.linuxsampler.org
  *
@@ -37,8 +37,30 @@
     STMT_BRANCH,
     STMT_LOOP,
     STMT_SYNC,
+    STMT_NOOP,
 };
 
+/**
+ * Convenience function used for retrieving the (assumed) data type of a given
+ * script variable name.
+ *
+ * @param name - some script variable name (e.g. "$foo")
+ * @return variable's assumed data type (e.g. INT_EXPR for example above)
+ */
+inline ExprType_t exprTypeOfVarName(const String& name) {
+    if (name.empty()) return (ExprType_t) -1;
+    const char prefix = name[0];
+    switch (prefix) {
+        case '$': return INT_EXPR;
+        case '%': return INT_ARR_EXPR;
+        case '~': return REAL_EXPR;
+        case '?': return REAL_ARR_EXPR;
+        case '@': return STRING_EXPR;
+        case '!': return STRING_ARR_EXPR;
+    }
+    return (ExprType_t) -1;
+}
+
 class Node {
 public:
     Node();
@@ -57,62 +79,142 @@
 };
 typedef Ref<Expression,Node> ExpressionRef;
 
-class IntExpr : virtual public VMIntExpr, virtual public Expression {
+class Unit : virtual public VMUnit, virtual public Node {
+    StdUnit_t unit;
+public:
+    Unit(StdUnit_t type) : unit(type) {}
+    StdUnit_t unitType() const OVERRIDE { return unit; }
+    static vmint convIntToUnitFactor(vmint iValue, VMUnit* srcUnit, VMUnit* dstUnit);
+    static vmint convIntToUnitFactor(vmint iValue, vmfloat srcFactor, vmfloat dstFactor);
+    static vmfloat convRealToUnitFactor(vmfloat fValue, VMUnit* srcUnit, VMUnit* dstUnit);
+    static vmfloat convRealToUnitFactor(vmfloat fValue, vmfloat srcFactor, vmfloat dstFactor);
+};
+typedef Ref<Unit,Node> UnitRef;
+
+class NumberExpr : virtual public Unit, virtual public VMNumberExpr, virtual public Expression {
 public:
-    ExprType_t exprType() const { return INT_EXPR; }
-    virtual int evalInt() = 0;
-    String evalCastToStr();
+};
+typedef Ref<NumberExpr,Node> NumberExprRef;
+
+class IntExpr : virtual public NumberExpr, virtual public VMIntExpr {
+public:
+    ExprType_t exprType() const OVERRIDE { return INT_EXPR; }
+    vmint evalIntToUnitFactor(vmfloat unitFactor);
+    String evalCastToStr() OVERRIDE;
 };
 typedef Ref<IntExpr,Node> IntExprRef;
 
-class IntArrayExpr : virtual public VMIntArrayExpr, virtual public Expression {
+class RealExpr : virtual public NumberExpr, virtual public VMRealExpr  {
+public:
+    ExprType_t exprType() const OVERRIDE { return REAL_EXPR; }
+    vmfloat evalRealToUnitFactor(vmfloat unitFactor);
+    String evalCastToStr() OVERRIDE;
+};
+typedef Ref<RealExpr,Node> RealExprRef;
+
+class ArrayExpr : virtual public VMArrayExpr, virtual public Expression {
 public:
-    ExprType_t exprType() const { return INT_ARR_EXPR; }
-    String evalCastToStr();
+};
+typedef Ref<ArrayExpr,Node> ArrayExprRef;
+
+class IntArrayExpr : virtual public VMIntArrayExpr, virtual public ArrayExpr {
+public:
+    ExprType_t exprType() const OVERRIDE { return INT_ARR_EXPR; }
+    String evalCastToStr() OVERRIDE;
 };
 typedef Ref<IntArrayExpr,Node> IntArrayExprRef;
 
+class RealArrayExpr : virtual public VMRealArrayExpr, virtual public ArrayExpr {
+public:
+    ExprType_t exprType() const OVERRIDE { return REAL_ARR_EXPR; }
+    String evalCastToStr() OVERRIDE;
+};
+typedef Ref<RealArrayExpr,Node> RealArrayExprRef;
+
 class StringExpr : virtual public VMStringExpr, virtual public Expression {
 public:
-    ExprType_t exprType() const { return STRING_EXPR; }
-    virtual String evalStr() = 0;
-    String evalCastToStr() { return evalStr(); }
+    ExprType_t exprType() const OVERRIDE { return STRING_EXPR; }
+    String evalCastToStr() OVERRIDE { return evalStr(); }
 };
 typedef Ref<StringExpr,Node> StringExprRef;
 
-class IntLiteral : virtual public IntExpr {
-    int value;
-public:
-    IntLiteral(int value) : value(value) { }
-    int evalInt();
-    void dump(int level = 0);
-    bool isConstExpr() const { return true; }
-    bool isPolyphonic() const { return false; }
+struct IntLitDef {
+    vmint value; //NOTE: sequence matters! Since this is usually initialized with VMIntExpr::evalInt() it should be before member unitFactor, since the latter is usually initialized with VMIntExpr::unitFactor() which does not evaluate the expression.
+    vmfloat unitFactor = VM_NO_FACTOR;
+    StdUnit_t unitType = VM_NO_UNIT;
+    bool isFinal;
+};
+
+class IntLiteral FINAL : public IntExpr {
+    bool finalVal;
+    vmfloat unitPrefixFactor;
+    vmint value;
+public:
+    IntLiteral(const IntLitDef& def);
+    vmint evalInt() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return unitPrefixFactor; }
+    void dump(int level = 0) OVERRIDE;
+    bool isConstExpr() const OVERRIDE { return true; }
+    bool isPolyphonic() const OVERRIDE { return false; }
+    bool isFinal() const OVERRIDE { return finalVal; }
 };
 typedef Ref<IntLiteral,Node> IntLiteralRef;
 
-class StringLiteral : virtual public StringExpr {
-public:
+struct RealLitDef {
+    vmfloat value; //NOTE: sequence matters! Since this is usually initialized with VMRealExpr::evalReal() it should be before member unitFactor, since the latter is usually initialized with VMRealExpr::unitFactor() which does not evaluate the expression.
+    vmfloat unitFactor = VM_NO_FACTOR;
+    StdUnit_t unitType = VM_NO_UNIT;
+    bool isFinal;
+};
+
+class RealLiteral FINAL : public RealExpr {
+    bool finalVal;
+    vmfloat unitPrefixFactor;
+    vmfloat value;
+public:
+    RealLiteral(const RealLitDef& def);
+    vmfloat evalReal() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return unitPrefixFactor; }
+    void dump(int level = 0) OVERRIDE;
+    bool isConstExpr() const OVERRIDE { return true; }
+    bool isPolyphonic() const OVERRIDE { return false; }
+    bool isFinal() const OVERRIDE { return finalVal; }
+};
+typedef Ref<RealLiteral,Node> RealLiteralRef;
+
+class StringLiteral FINAL : public StringExpr {
     String value;
+public:
     StringLiteral(const String& value) : value(value) { }
-    bool isConstExpr() const { return true; }
-    void dump(int level = 0);
-    String evalStr() { return value; }
-    bool isPolyphonic() const { return false; }
+    bool isConstExpr() const OVERRIDE { return true; }
+    void dump(int level = 0) OVERRIDE;
+    String evalStr() OVERRIDE { return value; }
+    bool isPolyphonic() const OVERRIDE { return false; }
 };
 typedef Ref<StringLiteral,Node> StringLiteralRef;
 
-class Args : virtual public VMFnArgs, virtual public Node {
+class Args FINAL : virtual public VMFnArgs, virtual public Node {
 public:
     std::vector<ExpressionRef> args;
     void add(ExpressionRef arg) { args.push_back(arg); }
-    void dump(int level = 0);
-    int argsCount() const { return (int) args.size(); }
-    VMExpr* arg(int i) { return (i >= 0 && i < argsCount()) ? &*args.at(i) : NULL; }
-    bool isPolyphonic() const;
+    void dump(int level = 0) OVERRIDE;
+    vmint argsCount() const OVERRIDE { return (vmint) args.size(); }
+    VMExpr* arg(vmint i) OVERRIDE { return (i >= 0 && i < argsCount()) ? &*args.at(i) : NULL; }
+    bool isPolyphonic() const OVERRIDE;
 };
 typedef Ref<Args,Node> ArgsRef;
 
+struct VariableDecl {
+    ParserContext* ctx;
+    bool isPolyphonic;
+    bool isConst;
+    bool isFinal;
+    vmint elements = 1;
+    vmint memPos;
+    vmint unitFactorMemPos;
+    StdUnit_t unitType = VM_NO_UNIT;
+};
+
 class Variable : virtual public VMVariable, virtual public Expression {
 public:
     bool isConstExpr() const OVERRIDE { return bConst; }
@@ -120,121 +222,227 @@
     virtual void assign(Expression* expr) = 0;
     void assignExpr(VMExpr* expr) OVERRIDE { Expression* e = dynamic_cast<Expression*>(expr); if (e) assign(e); }
 protected:
-    Variable(ParserContext* ctx, int _memPos, bool _bConst)
-        : context(ctx), memPos(_memPos), bConst(_bConst) {}
+    Variable(const VariableDecl& decl);
 
     ParserContext* context;
-    int memPos;
+    vmint memPos;
     bool bConst;
 };
 typedef Ref<Variable,Node> VariableRef;
 
-class IntVariable : public Variable, virtual public IntExpr {
+class NumberVariable : public Variable, virtual public NumberExpr {
     bool polyphonic;
+    bool finalVal;
+protected:
+    vmint unitFactorMemPos;
 public:
-    IntVariable(ParserContext* ctx);
-    void assign(Expression* expr);
-    int evalInt();
-    void dump(int level = 0);
-    bool isPolyphonic() const { return polyphonic; }
+    bool isPolyphonic() const OVERRIDE { return polyphonic; }
+    bool isFinal() const OVERRIDE { return finalVal; }
+    vmfloat unitFactor() const OVERRIDE;
 protected:
-    IntVariable(ParserContext* ctx, bool polyphonic, bool bConst, int size = 1);
+    NumberVariable(const VariableDecl& decl);
+};
+typedef Ref<NumberVariable,Node> NumberVariableRef;
+
+class IntVariable : public NumberVariable, virtual public IntExpr {
+public:
+    IntVariable(const VariableDecl& decl);
+    void assign(Expression* expr) OVERRIDE;
+    vmint evalInt() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<IntVariable,Node> IntVariableRef;
 
-class ConstIntVariable : public IntVariable {
+class RealVariable : public NumberVariable, virtual public RealExpr {
 public:
-    int value;
+    RealVariable(const VariableDecl& decl);
+    void assign(Expression* expr) OVERRIDE;
+    vmfloat evalReal() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+};
+typedef Ref<RealVariable,Node> RealVariableRef;
 
-    ConstIntVariable(int value);
-    //ConstIntVariable(ParserContext* ctx, int value = 0);
-    void assign(Expression* expr);
-    int evalInt();
-    void dump(int level = 0);
+struct IntVarDef /* : VariableDecl*/ { //NOTE: derived, aggregate initializer-lists requires C++17
+    // copied from VariableDecl
+    ParserContext* ctx;
+    bool isPolyphonic;
+    bool isConst;
+    bool isFinal;
+    vmint elements = 1;
+    vmint memPos;
+    vmint unitFactorMemPos;
+    StdUnit_t unitType = VM_NO_UNIT;
+    // additions for RealVarDef
+    vmint value = 0; //NOTE: sequence matters! Since this is usually initialized with VMIntExpr::evalInt() it should be before member unitFactor, since the latter is usually initialized with VMIntExpr::unitFactor() which does not evaluate the expression.
+    vmfloat unitFactor = VM_NO_FACTOR;
+};
+
+class ConstIntVariable FINAL : public IntVariable {
+    vmfloat unitPrefixFactor;
+    vmint value;
+public:
+    ConstIntVariable(const IntVarDef& def);
+    void assign(Expression* expr) OVERRIDE;
+    vmint evalInt() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return unitPrefixFactor; }
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<ConstIntVariable,Node> ConstIntVariableRef;
 
-class BuiltInIntVariable : public IntVariable {
+struct RealVarDef /* : VariableDecl*/ { //NOTE: derived, aggregate initializer-lists requires C++17
+    // copied from VariableDecl
+    ParserContext* ctx;
+    bool isPolyphonic;
+    bool isConst;
+    bool isFinal;
+    vmint elements = 1;
+    vmint memPos;
+    vmint unitFactorMemPos;
+    StdUnit_t unitType = VM_NO_UNIT;
+    // additions for RealVarDef
+    vmfloat value = vmfloat(0); //NOTE: sequence matters! Since this is usually initialized with VMRealExpr::evalReal() it should be before member unitFactor, since the latter is usually initialized with VMRealExpr::unitFactor() which does not evaluate the expression.
+    vmfloat unitFactor = VM_NO_FACTOR;
+};
+
+class ConstRealVariable FINAL : public RealVariable {
+    vmfloat unitPrefixFactor;
+    vmfloat value;
+public:
+    ConstRealVariable(const RealVarDef& def);
+    void assign(Expression* expr) OVERRIDE;
+    vmfloat evalReal() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return unitPrefixFactor; }
+    void dump(int level = 0) OVERRIDE;
+};
+typedef Ref<ConstRealVariable,Node> ConstRealVariableRef;
+
+class BuiltInIntVariable FINAL : public IntVariable {
     String name;
-    VMIntRelPtr* ptr;
+    VMIntPtr* ptr;
 public:
-    BuiltInIntVariable(const String& name, VMIntRelPtr* ptr);
-    bool isAssignable() const OVERRIDE { return !ptr->readonly; }
+    BuiltInIntVariable(const String& name, VMIntPtr* ptr);
+    bool isAssignable() const OVERRIDE { return ptr->isAssignable(); }
     void assign(Expression* expr) OVERRIDE;
-    int evalInt() OVERRIDE;
+    vmint evalInt() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_UNIT; }
     void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<BuiltInIntVariable,Node> BuiltInIntVariableRef;
 
-class PolyphonicIntVariable : public IntVariable {
+class PolyphonicIntVariable FINAL : public IntVariable {
 public:
-    PolyphonicIntVariable(ParserContext* ctx);
-    void dump(int level = 0);
+    PolyphonicIntVariable(const VariableDecl& decl);
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<PolyphonicIntVariable,Node> PolyphonicIntVariableRef;
 
+class PolyphonicRealVariable FINAL : public RealVariable {
+public:
+    PolyphonicRealVariable(const VariableDecl& decl);
+    void dump(int level = 0) OVERRIDE;
+};
+typedef Ref<PolyphonicRealVariable,Node> PolyphonicRealVariableRef;
+
 class IntArrayVariable : public Variable, virtual public IntArrayExpr {
-    ArrayList<int> values;
+    ArrayList<vmint> values;
+    ArrayList<vmfloat> unitFactors;
 public:
-    IntArrayVariable(ParserContext* ctx, int size);
-    IntArrayVariable(ParserContext* ctx, int size, ArgsRef values, bool _bConst = false);
-    void assign(Expression* expr) {} // ignore scalar assignment
-    String evalCastToStr() { return ""; } // ignore scalar cast to string
-    ExprType_t exprType() const { return INT_ARR_EXPR; }
-    virtual int arraySize() const { return values.size(); }
-    virtual int evalIntElement(uint i);
-    virtual void assignIntElement(uint i, int value);
-    void dump(int level = 0);
-    bool isPolyphonic() const { return false; }
+    IntArrayVariable(ParserContext* ctx, vmint size);
+    IntArrayVariable(ParserContext* ctx, vmint size, ArgsRef values, bool _bConst = false);
+    void assign(Expression* expr) OVERRIDE {} // ignore scalar assignment
+    ExprType_t exprType() const OVERRIDE { return INT_ARR_EXPR; }
+    virtual vmint arraySize() const OVERRIDE { return values.size(); }
+    virtual vmint evalIntElement(vmuint i) OVERRIDE;
+    virtual void assignIntElement(vmuint i, vmint value) OVERRIDE;
+    vmfloat unitFactorOfElement(vmuint i) const OVERRIDE;
+    void assignElementUnitFactor(vmuint i, vmfloat factor) OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    bool isPolyphonic() const OVERRIDE { return false; }
 protected:
     IntArrayVariable(ParserContext* ctx, bool bConst);
 };
 typedef Ref<IntArrayVariable,Node> IntArrayVariableRef;
 
-class BuiltInIntArrayVariable : public IntArrayVariable {
+class RealArrayVariable FINAL : public Variable, virtual public RealArrayExpr {
+    ArrayList<vmfloat> values;
+    ArrayList<vmfloat> unitFactors;
+public:
+    RealArrayVariable(ParserContext* ctx, vmint size);
+    RealArrayVariable(ParserContext* ctx, vmint size, ArgsRef values, bool _bConst = false);
+    void assign(Expression* expr) OVERRIDE {} // ignore scalar assignment
+    ExprType_t exprType() const OVERRIDE { return REAL_ARR_EXPR; }
+    virtual vmint arraySize() const OVERRIDE { return values.size(); }
+    virtual vmfloat evalRealElement(vmuint i) OVERRIDE;
+    virtual void assignRealElement(vmuint i, vmfloat value) OVERRIDE;
+    vmfloat unitFactorOfElement(vmuint i) const OVERRIDE;
+    void assignElementUnitFactor(vmuint i, vmfloat factor) OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    bool isPolyphonic() const OVERRIDE { return false; }
+protected:
+    RealArrayVariable(ParserContext* ctx, bool bConst);
+};
+typedef Ref<RealArrayVariable,Node> RealArrayVariableRef;
+
+class BuiltInIntArrayVariable FINAL : public IntArrayVariable {
     String name;
     VMInt8Array* array;
 public:
     BuiltInIntArrayVariable(const String& name, VMInt8Array* array);
-    int arraySize() const { return array->size; }
-    int evalIntElement(uint i);
+    vmint arraySize() const OVERRIDE { return array->size; }
+    vmint evalIntElement(vmuint i) OVERRIDE;
+    void assignIntElement(vmuint i, vmint value) OVERRIDE;
+    vmfloat unitFactorOfElement(vmuint i) const OVERRIDE { return VM_NO_FACTOR; }
+    void assignElementUnitFactor(vmuint i, vmfloat factor) OVERRIDE {}
     bool isAssignable() const OVERRIDE { return !array->readonly; }
-    void assignIntElement(uint i, int value);
-    void dump(int level = 0);
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<BuiltInIntArrayVariable,Node> BuiltInIntArrayVariableRef;
 
-class IntArrayElement : public IntVariable {
+class IntArrayElement FINAL : public IntVariable {
     IntArrayExprRef array;
     IntExprRef index;
+    vmint currentIndex;
 public:
     IntArrayElement(IntArrayExprRef array, IntExprRef arrayIndex);
-    void assign(Expression* expr);
-    int evalInt();
-    void dump(int level = 0);
+    void assign(Expression* expr) OVERRIDE;
+    vmint evalInt() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<IntArrayElement,Node> IntArrayElementRef;
 
+class RealArrayElement FINAL : public RealVariable {
+    RealArrayExprRef array;
+    IntExprRef index;
+    vmint currentIndex;
+public:
+    RealArrayElement(RealArrayExprRef array, IntExprRef arrayIndex);
+    void assign(Expression* expr) OVERRIDE;
+    vmfloat evalReal() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+};
+typedef Ref<RealArrayElement,Node> RealArrayElementRef;
+
 class StringVariable : public Variable, virtual public StringExpr {
 public:
     StringVariable(ParserContext* ctx);
-    void assign(Expression* expr);
-    String evalStr();
-    void dump(int level = 0);
-    bool isPolyphonic() const { return false; }
+    void assign(Expression* expr) OVERRIDE;
+    String evalStr() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    bool isPolyphonic() const OVERRIDE { return false; }
 protected:
     StringVariable(ParserContext* ctx, bool bConst);
 };
 typedef Ref<StringVariable,Node> StringVariableRef;
 
-class ConstStringVariable : public StringVariable {
-public:
+class ConstStringVariable FINAL : public StringVariable {
     String value;
-
+public:
     ConstStringVariable(ParserContext* ctx, String value = "");
-    void assign(Expression* expr);
-    String evalStr();
-    void dump(int level = 0);
+    void assign(Expression* expr) OVERRIDE;
+    String evalStr() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<ConstStringVariable,Node> ConstStringVariableRef;
 
@@ -244,48 +452,78 @@
     ExpressionRef rhs;
 public:
     BinaryOp(ExpressionRef lhs, ExpressionRef rhs) : lhs(lhs), rhs(rhs) { }
-    bool isConstExpr() const { return lhs->isConstExpr() && rhs->isConstExpr(); }
-    bool isPolyphonic() const { return lhs->isPolyphonic() || rhs->isPolyphonic(); }
+    bool isConstExpr() const OVERRIDE { return lhs->isConstExpr() && rhs->isConstExpr(); }
+    bool isPolyphonic() const OVERRIDE { return lhs->isPolyphonic() || rhs->isPolyphonic(); }
 };
 typedef Ref<BinaryOp,Node> BinaryOpRef;
 
-class Add : virtual public BinaryOp, virtual public IntExpr {
+class NumberBinaryOp : public BinaryOp, virtual public NumberExpr {
+public:
+    NumberBinaryOp(NumberExprRef lhs, NumberExprRef rhs) : BinaryOp(lhs, rhs) { }
+    bool isFinal() const OVERRIDE;
+};
+typedef Ref<NumberBinaryOp,Node> NumberBinaryOpRef;
+
+class IntBinaryOp : public NumberBinaryOp, virtual public IntExpr {
+public:
+    IntBinaryOp(IntExprRef lhs, IntExprRef rhs) : NumberBinaryOp(lhs, rhs) { }
+};
+typedef Ref<IntBinaryOp,Node> IntBinaryOpRef;
+
+class VaritypeScalarBinaryOp : public NumberBinaryOp, virtual public IntExpr, virtual public RealExpr {
+public:
+    VaritypeScalarBinaryOp(NumberExprRef lhs, NumberExprRef rhs) : NumberBinaryOp(lhs, rhs) { }
+    ExprType_t exprType() const OVERRIDE;
+    String evalCastToStr() OVERRIDE;
+};
+typedef Ref<VaritypeScalarBinaryOp,Node> VaritypeScalarBinaryOpRef;
+
+class Add FINAL : public VaritypeScalarBinaryOp {
 public:
-    Add(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs, rhs) { }
-    int evalInt();
-    void dump(int level = 0);
+    Add(NumberExprRef lhs, NumberExprRef rhs);
+    vmint evalInt() OVERRIDE;
+    vmfloat evalReal() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<Add,Node> AddRef;
 
-class Sub : virtual public BinaryOp, virtual public IntExpr {
+class Sub FINAL : public VaritypeScalarBinaryOp {
 public:
-    Sub(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs, rhs) { }
-    int evalInt();
-    void dump(int level = 0);
+    Sub(NumberExprRef lhs, NumberExprRef rhs);
+    vmint evalInt() OVERRIDE;
+    vmfloat evalReal() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<Sub,Node> SubRef;
 
-class Mul : virtual public BinaryOp, virtual public IntExpr {
+class Mul FINAL : public VaritypeScalarBinaryOp {
 public:
-    Mul(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs, rhs) { }
-    int evalInt();
-    void dump(int level = 0);
+    Mul(NumberExprRef lhs, NumberExprRef rhs);
+    vmint evalInt() OVERRIDE;
+    vmfloat evalReal() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<Mul,Node> MulRef;
 
-class Div : virtual public BinaryOp, virtual public IntExpr {
+class Div FINAL : public VaritypeScalarBinaryOp {
 public:
-    Div(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs, rhs) { }
-    int evalInt();
-    void dump(int level = 0);
+    Div(NumberExprRef lhs, NumberExprRef rhs);
+    vmint evalInt() OVERRIDE;
+    vmfloat evalReal() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE;
 };
 typedef Ref<Div,Node> DivRef;
 
-class Mod : virtual public BinaryOp, virtual public IntExpr {
+class Mod FINAL : public IntBinaryOp {
 public:
-    Mod(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs, rhs) { }
-    int evalInt();
-    void dump(int level = 0);
+    Mod(IntExprRef lhs, IntExprRef rhs) : IntBinaryOp(lhs, rhs), Unit(VM_NO_UNIT) { }
+    vmint evalInt() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<Mod,Node> ModRef;
 
@@ -297,12 +535,12 @@
 
 // Just used by parser to avoid "not a statement" parser warning, will be
 // filtered out by parser. So it will not be part of the VM tree after parsing.
-class NoOperation : public Statement {
+class NoOperation FINAL : public Statement {
 public:
     NoOperation() : Statement() {}
-    StmtType_t statementType() const { return STMT_LEAF; }
-    void dump(int level = 0) {}
-    bool isPolyphonic() const { return false; }
+    StmtType_t statementType() const OVERRIDE { return STMT_NOOP; }
+    void dump(int level = 0) OVERRIDE {}
+    bool isPolyphonic() const OVERRIDE { return false; }
 };
 typedef Ref<NoOperation,Node> NoOperationRef;
 
@@ -311,7 +549,7 @@
 class LeafStatement : public Statement {
 public:
     virtual StmtFlags_t exec() = 0;
-    virtual StmtType_t statementType() const { return STMT_LEAF; }
+    StmtType_t statementType() const OVERRIDE { return STMT_LEAF; }
 };
 typedef Ref<LeafStatement,Node> LeafStatementRef;
 
@@ -319,21 +557,21 @@
     std::vector<StatementRef> args;
 public:
     void add(StatementRef arg) { args.push_back(arg); }
-    void dump(int level = 0);
-    StmtType_t statementType() const { return STMT_LIST; }
+    void dump(int level = 0) OVERRIDE;
+    StmtType_t statementType() const OVERRIDE { return STMT_LIST; }
     virtual Statement* statement(uint i);
-    bool isPolyphonic() const;
+    bool isPolyphonic() const OVERRIDE;
 };
 typedef Ref<Statements,Node> StatementsRef;
 
 class BranchStatement : public Statement {
 public:
-    StmtType_t statementType() const { return STMT_BRANCH; }
-    virtual int evalBranch() = 0;
-    virtual Statements* branch(uint i) const = 0;
+    StmtType_t statementType() const OVERRIDE { return STMT_BRANCH; }
+    virtual vmint evalBranch() = 0;
+    virtual Statements* branch(vmuint i) const = 0;
 };
 
-class DynamicVariableCall : public Variable, virtual public IntExpr, virtual public StringExpr, virtual public IntArrayExpr {
+class DynamicVariableCall FINAL : public Variable, virtual public IntExpr, virtual public StringExpr, virtual public IntArrayExpr {
     VMDynVar* dynVar;
     String varName;
 public:
@@ -344,109 +582,123 @@
     bool isPolyphonic() const OVERRIDE { return false; }
     void assign(Expression* expr) OVERRIDE { dynVar->assignExpr(expr); }
     VMIntArrayExpr* asIntArray() const OVERRIDE { return dynVar->asIntArray(); }
-    int evalInt() OVERRIDE;
+    vmint evalInt() OVERRIDE;
     String evalStr() OVERRIDE;
     String evalCastToStr() OVERRIDE;
-    int arraySize() const OVERRIDE { return dynVar->asIntArray()->arraySize(); }
-    int evalIntElement(uint i) OVERRIDE { return dynVar->asIntArray()->evalIntElement(i); }
-    void assignIntElement(uint i, int value) { return dynVar->asIntArray()->assignIntElement(i, value); }
+    vmint arraySize() const OVERRIDE { return dynVar->asIntArray()->arraySize(); }
+    vmint evalIntElement(vmuint i) OVERRIDE { return dynVar->asIntArray()->evalIntElement(i); }
+    void assignIntElement(vmuint i, vmint value) OVERRIDE { return dynVar->asIntArray()->assignIntElement(i, value); }
+    vmfloat unitFactorOfElement(vmuint i) const OVERRIDE { return VM_NO_FACTOR; }
+    void assignElementUnitFactor(vmuint i, vmfloat factor) OVERRIDE {}
     void dump(int level = 0) OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
+    bool isFinal() const OVERRIDE { return false; }
 };
 typedef Ref<DynamicVariableCall,Node> DynamicVariableCallRef;
 
-class FunctionCall : virtual public LeafStatement, virtual public IntExpr, virtual public StringExpr {
+class FunctionCall : virtual public LeafStatement, virtual public IntExpr, virtual public RealExpr, virtual public StringExpr {
     String functionName;
     ArgsRef args;
     VMFunction* fn;
+    VMFnResult* result;
 public:
-    FunctionCall(const char* function, ArgsRef args, VMFunction* fn) :
-        functionName(function), args(args), fn(fn) { }
+    FunctionCall(const char* function, ArgsRef args, VMFunction* fn);
     void dump(int level = 0) OVERRIDE;
     StmtFlags_t exec() OVERRIDE;
-    int evalInt() OVERRIDE;
+    vmint evalInt() OVERRIDE;
+    vmfloat evalReal() OVERRIDE;
     VMIntArrayExpr* asIntArray() const OVERRIDE;
+    VMRealArrayExpr* asRealArray() const OVERRIDE;
     String evalStr() OVERRIDE;
     bool isConstExpr() const OVERRIDE { return false; }
     ExprType_t exprType() const OVERRIDE;
     String evalCastToStr() OVERRIDE;
     bool isPolyphonic() const OVERRIDE { return args->isPolyphonic(); }
+    vmfloat unitFactor() const OVERRIDE;
+    bool isFinal() const OVERRIDE;
 protected:
     VMFnResult* execVMFn();
 };
 typedef Ref<FunctionCall,Node> FunctionCallRef;
 
+class NoFunctionCall FINAL : public FunctionCall {
+public:
+    NoFunctionCall() : FunctionCall("nothing", new Args, NULL), Unit(VM_NO_UNIT) {}
+    StmtType_t statementType() const OVERRIDE { return STMT_NOOP; }
+};
+typedef Ref<NoFunctionCall,Node> NoFunctionCallRef;
+
 class EventHandler : virtual public Statements, virtual public VMEventHandler {
     StatementsRef statements;
     bool usingPolyphonics;
 public:
-    void dump(int level = 0);
+    void dump(int level = 0) OVERRIDE;
     StmtFlags_t exec();
     EventHandler(StatementsRef statements);
-    Statement* statement(uint i) { return statements->statement(i); }
-    bool isPolyphonic() const { return usingPolyphonics; }
+    Statement* statement(uint i) OVERRIDE { return statements->statement(i); }
+    bool isPolyphonic() const OVERRIDE { return usingPolyphonics; }
 };
 typedef Ref<EventHandler,Node> EventHandlerRef;
 
-class OnNote : public EventHandler {
+class OnNote FINAL : public EventHandler {
 public:
     OnNote(StatementsRef statements) : EventHandler(statements) {}
-    VMEventHandlerType_t eventHandlerType() const { return VM_EVENT_HANDLER_NOTE; }
-    String eventHandlerName() const { return "note"; }
+    VMEventHandlerType_t eventHandlerType() const OVERRIDE { return VM_EVENT_HANDLER_NOTE; }
+    String eventHandlerName() const OVERRIDE { return "note"; }
 };
 typedef Ref<OnNote,Node> OnNoteRef;
 
-class OnInit : public EventHandler {
+class OnInit FINAL : public EventHandler {
 public:
     OnInit(StatementsRef statements) : EventHandler(statements) {}
-    VMEventHandlerType_t eventHandlerType() const { return VM_EVENT_HANDLER_INIT; }
-    String eventHandlerName() const { return "init"; }
+    VMEventHandlerType_t eventHandlerType() const OVERRIDE { return VM_EVENT_HANDLER_INIT; }
+    String eventHandlerName() const OVERRIDE { return "init"; }
 };
 typedef Ref<OnInit,Node> OnInitRef;
 
-class OnRelease : public EventHandler {
+class OnRelease FINAL : public EventHandler {
 public:
     OnRelease(StatementsRef statements) : EventHandler(statements) {}
-    VMEventHandlerType_t eventHandlerType() const { return VM_EVENT_HANDLER_RELEASE; }
-    String eventHandlerName() const { return "release"; }
+    VMEventHandlerType_t eventHandlerType() const OVERRIDE { return VM_EVENT_HANDLER_RELEASE; }
+    String eventHandlerName() const OVERRIDE { return "release"; }
 };
 typedef Ref<OnRelease,Node> OnReleaseRef;
 
-class OnController : public EventHandler {
+class OnController FINAL : public EventHandler {
 public:
     OnController(StatementsRef statements) : EventHandler(statements) {}
-    VMEventHandlerType_t eventHandlerType() const { return VM_EVENT_HANDLER_CONTROLLER; }
-    String eventHandlerName() const { return "controller"; }
+    VMEventHandlerType_t eventHandlerType() const OVERRIDE { return VM_EVENT_HANDLER_CONTROLLER; }
+    String eventHandlerName() const OVERRIDE { return "controller"; }
 };
 typedef Ref<OnController,Node> OnControllerRef;
 
-class EventHandlers : virtual public Node {
+class EventHandlers FINAL : virtual public Node {
     std::vector<EventHandlerRef> args;
 public:
     EventHandlers();
     ~EventHandlers();
     void add(EventHandlerRef arg);
-    void dump(int level = 0);
-    int evalInt() { return 0; }
+    void dump(int level = 0) OVERRIDE;
     EventHandler* eventHandlerByName(const String& name) const;
     EventHandler* eventHandler(uint index) const;
     inline uint size() const { return (int) args.size(); }
-    bool isPolyphonic() const;
+    bool isPolyphonic() const OVERRIDE;
 };
 typedef Ref<EventHandlers,Node> EventHandlersRef;
 
-class Assignment : public LeafStatement {
+class Assignment FINAL : public LeafStatement {
 protected:
     VariableRef variable;
     ExpressionRef value;
 public:
     Assignment(VariableRef variable, ExpressionRef value);
-    void dump(int level = 0);
-    StmtFlags_t exec();
-    bool isPolyphonic() const { return (variable && variable->isPolyphonic()) || (value && value->isPolyphonic()); }
+    void dump(int level = 0) OVERRIDE;
+    StmtFlags_t exec() OVERRIDE;
+    bool isPolyphonic() const OVERRIDE { return (variable && variable->isPolyphonic()) || (value && value->isPolyphonic()); }
 };
 typedef Ref<Assignment,Node> AssignmentRef;
 
-class If : public BranchStatement {
+class If FINAL : public BranchStatement {
     IntExprRef condition;
     StatementsRef ifStatements;
     StatementsRef elseStatements;
@@ -455,85 +707,85 @@
         condition(condition), ifStatements(ifStatements), elseStatements(elseStatements) { }
     If(IntExprRef condition, StatementsRef statements) :
         condition(condition), ifStatements(statements) { }
-    void dump(int level = 0);
-    int evalBranch();
-    Statements* branch(uint i) const;
-    bool isPolyphonic() const;
+    void dump(int level = 0) OVERRIDE;
+    vmint evalBranch() OVERRIDE;
+    Statements* branch(vmuint i) const OVERRIDE;
+    bool isPolyphonic() const OVERRIDE;
 };
 typedef Ref<If,Node> IfRef;
 
-struct CaseBranch {
+struct CaseBranch FINAL {
     IntExprRef from;
     IntExprRef to;
     StatementsRef statements;
 };
-
 typedef std::vector<CaseBranch> CaseBranches;
 
-class SelectCase : public BranchStatement {
+class SelectCase FINAL : public BranchStatement {
     IntExprRef select;
     CaseBranches branches;
 public:
     SelectCase(IntExprRef select, const CaseBranches& branches) : select(select), branches(branches) { }
-    void dump(int level = 0);
-    int evalBranch();
-    Statements* branch(uint i) const;
-    //void addBranch(IntExprRef condition, StatementsRef statements);
-    //void addBranch(IntExprRef from, IntExprRef to, StatementsRef statements);
-    //void addBranch(CaseBranchRef branch);
-    //void addBranches(CaseBranchesRef branches);
-    bool isPolyphonic() const;
+    void dump(int level = 0) OVERRIDE;
+    vmint evalBranch() OVERRIDE;
+    Statements* branch(vmuint i) const OVERRIDE;
+    bool isPolyphonic() const OVERRIDE;
 };
 typedef Ref<SelectCase,Node> SelectCaseRef;
 
-class While : public Statement {
+class While FINAL : public Statement {
     IntExprRef m_condition;
     StatementsRef m_statements;
 public:
     While(IntExprRef condition, StatementsRef statements) :
         m_condition(condition), m_statements(statements) {}
-    StmtType_t statementType() const { return STMT_LOOP; }
-    void dump(int level = 0);
+    StmtType_t statementType() const OVERRIDE { return STMT_LOOP; }
+    void dump(int level = 0) OVERRIDE;
     bool evalLoopStartCondition();
     Statements* statements() const;
-    bool isPolyphonic() const { return m_condition->isPolyphonic() || m_statements->isPolyphonic(); }
+    bool isPolyphonic() const OVERRIDE { return m_condition->isPolyphonic() || m_statements->isPolyphonic(); }
 };
 
-class SyncBlock : public Statement {
+class SyncBlock FINAL : public Statement {
     StatementsRef m_statements;
 public:
     SyncBlock(StatementsRef statements) : m_statements(statements) {}
-    StmtType_t statementType() const { return STMT_SYNC; }
-    void dump(int level = 0);
+    StmtType_t statementType() const OVERRIDE { return STMT_SYNC; }
+    void dump(int level = 0) OVERRIDE;
     Statements* statements() const;
-    bool isPolyphonic() const { return m_statements->isPolyphonic(); }
+    bool isPolyphonic() const OVERRIDE { return m_statements->isPolyphonic(); }
 };
 typedef Ref<SyncBlock,Node> SyncBlockRef;
 
-class Neg : public IntExpr {
-    IntExprRef expr;
+class Neg FINAL : virtual public IntExpr, virtual public RealExpr {
+    NumberExprRef expr;
 public:
-    Neg(IntExprRef expr) : expr(expr) { }
-    int evalInt() { return (expr) ? -expr->evalInt() : 0; }
-    void dump(int level = 0);
-    bool isConstExpr() const { return expr->isConstExpr(); }
-    bool isPolyphonic() const { return expr->isPolyphonic(); }
+    Neg(NumberExprRef expr) : Unit(expr->unitType()), expr(expr) { }
+    ExprType_t exprType() const OVERRIDE { return expr->exprType(); }
+    vmint evalInt() OVERRIDE { return (expr) ? -(expr->asInt()->evalInt()) : 0; }
+    vmfloat evalReal() OVERRIDE { return (expr) ? -(expr->asReal()->evalReal()) : vmfloat(0); }
+    String evalCastToStr() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    bool isConstExpr() const OVERRIDE { return expr->isConstExpr(); }
+    bool isPolyphonic() const OVERRIDE { return expr->isPolyphonic(); }
+    vmfloat unitFactor() const OVERRIDE { return expr->unitFactor(); }
+    bool isFinal() const OVERRIDE { return expr->isFinal(); }
 };
 typedef Ref<Neg,Node> NegRef;
 
-class ConcatString : public StringExpr {
+class ConcatString FINAL : public StringExpr {
     ExpressionRef lhs;
     ExpressionRef rhs;
 public:
     ConcatString(ExpressionRef lhs, ExpressionRef rhs) : lhs(lhs), rhs(rhs) {}
-    String evalStr();
-    void dump(int level = 0);
-    bool isConstExpr() const;
-    bool isPolyphonic() const { return lhs->isPolyphonic() || rhs->isPolyphonic(); }
+    String evalStr() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    bool isConstExpr() const OVERRIDE;
+    bool isPolyphonic() const OVERRIDE { return lhs->isPolyphonic() || rhs->isPolyphonic(); }
 };
 typedef Ref<ConcatString,Node> ConcatStringRef;
 
-class Relation : public IntExpr {
+class Relation FINAL : public IntExpr {
 public:
     enum Type {
         LESS_THAN,
@@ -543,74 +795,99 @@
         EQUAL,
         NOT_EQUAL
     };
-    Relation(IntExprRef lhs, Type type, IntExprRef rhs) :
-        lhs(lhs), rhs(rhs), type(type) {}
-    int evalInt();
-    void dump(int level = 0);
-    bool isConstExpr() const;
-    bool isPolyphonic() const { return lhs->isPolyphonic() || rhs->isPolyphonic(); }
+    Relation(ExpressionRef lhs, Type type, ExpressionRef rhs);
+    vmint evalInt() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    bool isConstExpr() const OVERRIDE;
+    bool isPolyphonic() const OVERRIDE { return lhs->isPolyphonic() || rhs->isPolyphonic(); }
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
+    bool isFinal() const OVERRIDE { return false; }
 private:
-    IntExprRef lhs;
-    IntExprRef rhs;
+    ExpressionRef lhs;
+    ExpressionRef rhs;
     Type type;
 };
 typedef Ref<Relation,Node> RelationRef;
 
-class Or : virtual public BinaryOp, virtual public IntExpr {
+class Or FINAL : public IntBinaryOp {
 public:
-    Or(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs,rhs) {}
-    int evalInt();
-    void dump(int level = 0);
+    Or(IntExprRef lhs, IntExprRef rhs) : IntBinaryOp(lhs,rhs), Unit(VM_NO_UNIT) {}
+    vmint evalInt() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<Or,Node> OrRef;
 
-class BitwiseOr : virtual public BinaryOp, virtual public IntExpr {
+class BitwiseOr FINAL : public IntBinaryOp {
 public:
-    BitwiseOr(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs,rhs) {}
-    int evalInt();
-    void dump(int level = 0);
+    BitwiseOr(IntExprRef lhs, IntExprRef rhs) : IntBinaryOp(lhs,rhs), Unit(VM_NO_UNIT) {}
+    vmint evalInt() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
 };
 typedef Ref<BitwiseOr,Node> BitwiseOrRef;
 
-class And : virtual public BinaryOp, virtual public IntExpr {
+class And FINAL : public IntBinaryOp {
 public:
-    And(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs,rhs) {}
-    int evalInt();
-    void dump(int level = 0);
+    And(IntExprRef lhs, IntExprRef rhs) : IntBinaryOp(lhs,rhs), Unit(VM_NO_UNIT) {}
+    vmint evalInt() OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
+    void dump(int level = 0) OVERRIDE;
 };
 typedef Ref<And,Node> AndRef;
 
-class BitwiseAnd : virtual public BinaryOp, virtual public IntExpr {
+class BitwiseAnd FINAL : public IntBinaryOp {
 public:
-    BitwiseAnd(IntExprRef lhs, IntExprRef rhs) : BinaryOp(lhs,rhs) {}
-    int evalInt();
-    void dump(int level = 0);
+    BitwiseAnd(IntExprRef lhs, IntExprRef rhs) : IntBinaryOp(lhs,rhs), Unit(VM_NO_UNIT) {}
+    vmint evalInt() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
 };
 typedef Ref<BitwiseAnd,Node> BitwiseAndRef;
 
-class Not : virtual public IntExpr {
+class Not FINAL : virtual public IntExpr {
     IntExprRef expr;
 public:
-    Not(IntExprRef expr) : expr(expr) {}
-    int evalInt() { return !expr->evalInt(); }
-    void dump(int level = 0);
-    bool isConstExpr() const { return expr->isConstExpr(); }
-    bool isPolyphonic() const { return expr->isPolyphonic(); }
+    Not(IntExprRef expr) : Unit(VM_NO_UNIT), expr(expr) {}
+    vmint evalInt() OVERRIDE { return !expr->evalInt(); }
+    void dump(int level = 0) OVERRIDE;
+    bool isConstExpr() const OVERRIDE { return expr->isConstExpr(); }
+    bool isPolyphonic() const OVERRIDE { return expr->isPolyphonic(); }
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
+    bool isFinal() const OVERRIDE { return expr->isFinal(); }
 };
 typedef Ref<Not,Node> NotRef;
 
-class BitwiseNot : virtual public IntExpr {
+class BitwiseNot FINAL : virtual public IntExpr {
     IntExprRef expr;
 public:
-    BitwiseNot(IntExprRef expr) : expr(expr) {}
-    int evalInt() { return ~expr->evalInt(); }
-    void dump(int level = 0);
-    bool isConstExpr() const { return expr->isConstExpr(); }
-    bool isPolyphonic() const { return expr->isPolyphonic(); }
+    BitwiseNot(IntExprRef expr) : Unit(VM_NO_UNIT), expr(expr) {}
+    vmint evalInt() OVERRIDE { return ~expr->evalInt(); }
+    void dump(int level = 0) OVERRIDE;
+    bool isConstExpr() const OVERRIDE { return expr->isConstExpr(); }
+    bool isPolyphonic() const OVERRIDE { return expr->isPolyphonic(); }
+    vmfloat unitFactor() const OVERRIDE { return VM_NO_FACTOR; }
+    bool isFinal() const OVERRIDE { return expr->isFinal(); }
 };
 typedef Ref<BitwiseNot,Node> BitwiseNotRef;
 
-class ParserContext : public VMParserContext {
+class Final FINAL : virtual public IntExpr, virtual public RealExpr {
+    NumberExprRef expr;
+public:
+    Final(NumberExprRef expr) : Unit(expr->unitType()), expr(expr) {}
+    ExprType_t exprType() const OVERRIDE { return expr->exprType(); }
+    vmint evalInt() OVERRIDE { return expr->asInt()->evalInt(); }
+    vmfloat evalReal() OVERRIDE { return expr->asReal()->evalReal(); }
+    String evalCastToStr() OVERRIDE;
+    void dump(int level = 0) OVERRIDE;
+    bool isConstExpr() const OVERRIDE { return expr->isConstExpr(); }
+    bool isPolyphonic() const OVERRIDE { return expr->isPolyphonic(); }
+    vmfloat unitFactor() const OVERRIDE { return expr->unitFactor(); }
+    bool isFinal() const OVERRIDE { return true; }
+};
+typedef Ref<Final,Node> FinalRef;
+
+class ParserContext FINAL : public VMParserContext {
 public:
     struct Error {
         String txt;
@@ -630,9 +907,13 @@
 
     std::map<String,VariableRef> vartable;
     std::map<String,StatementsRef> userFnTable;
-    int globalIntVarCount;
-    int globalStrVarCount;
-    int polyphonicIntVarCount;
+    vmint globalIntVarCount;
+    vmint globalRealVarCount;
+    vmint globalStrVarCount;
+    vmint globalUnitFactorCount;
+    vmint polyphonicIntVarCount;
+    vmint polyphonicRealVarCount;
+    vmint polyphonicUnitFactorCount;
 
     EventHandlersRef handlers;
 
@@ -641,9 +922,11 @@
     OnReleaseRef onRelease;
     OnControllerRef onController;
 
-    ArrayList<int>* globalIntMemory;
+    ArrayList<vmint>* globalIntMemory;
+    ArrayList<vmfloat>* globalRealMemory;
     ArrayList<String>* globalStrMemory;
-    int requiredMaxStackSize;
+    ArrayList<vmfloat>* globalUnitFactorMemory;
+    vmint requiredMaxStackSize;
 
     VMFunctionProvider* functionProvider;
 
@@ -651,14 +934,20 @@
 
     ParserContext(VMFunctionProvider* parent) :
         scanner(NULL), is(NULL),
-        globalIntVarCount(0), globalStrVarCount(0), polyphonicIntVarCount(0),
-        globalIntMemory(NULL), globalStrMemory(NULL), requiredMaxStackSize(-1),
+        globalIntVarCount(0), globalRealVarCount(0), globalStrVarCount(0),
+        globalUnitFactorCount(0),
+        polyphonicIntVarCount(0), polyphonicRealVarCount(0),
+        polyphonicUnitFactorCount(0),
+        globalIntMemory(NULL), globalRealMemory(NULL), globalStrMemory(NULL),
+        globalUnitFactorMemory(NULL),
+        requiredMaxStackSize(-1),
         functionProvider(parent), execContext(NULL)
     {
     }
     virtual ~ParserContext();
     VariableRef globalVar(const String& name);
     IntVariableRef globalIntVar(const String& name);
+    RealVariableRef globalRealVar(const String& name);
     StringVariableRef globalStrVar(const String& name);
     VariableRef variableByName(const String& name);
     StatementsRef userFunctionByName(const String& name);
@@ -676,13 +965,13 @@
     std::vector<CodeBlock> preprocessorComments() const OVERRIDE;
     VMEventHandler* eventHandler(uint index) OVERRIDE;
     VMEventHandler* eventHandlerByName(const String& name) OVERRIDE;
-    void registerBuiltInConstIntVariables(const std::map<String,int>& vars);
-    void registerBuiltInIntVariables(const std::map<String,VMIntRelPtr*>& vars);
+    void registerBuiltInConstIntVariables(const std::map<String,vmint>& vars);
+    void registerBuiltInIntVariables(const std::map<String,VMIntPtr*>& vars);
     void registerBuiltInIntArrayVariables(const std::map<String,VMInt8Array*>& vars);
     void registerBuiltInDynVariables(const std::map<String,VMDynVar*>& vars);
 };
 
-class ExecContext : public VMExecContext {
+class ExecContext FINAL : public VMExecContext {
 public:
     struct StackFrame {
         Statement* statement;
@@ -694,18 +983,27 @@
         }
     };
 
-    ArrayList<int> polyphonicIntMemory;
+    ArrayList<vmint> polyphonicIntMemory;
+    ArrayList<vmfloat> polyphonicRealMemory;
+    ArrayList<vmfloat> polyphonicUnitFactorMemory;
     VMExecStatus_t status;
     StmtFlags_t flags;
     ArrayList<StackFrame> stack;
     int stackFrame;
-    int suspendMicroseconds;
+    vmint suspendMicroseconds;
     size_t instructionsCount;
+    struct ExitRes {
+        Expression* value;
+        IntLiteral intLiteral;
+        RealLiteral realLiteral;
+        StringLiteral stringLiteral;
+
+        ExitRes() :
+            intLiteral({ .value = 0 }), realLiteral({ .value = 0.0 }),
+            stringLiteral("") { }
+    } exitRes;
 
-    ExecContext() :
-        status(VM_EXEC_NOT_RUNNING), flags(STMT_SUCCESS), stackFrame(-1),
-        suspendMicroseconds(0), instructionsCount(0) {}
-
+    ExecContext();
     virtual ~ExecContext() {}
 
     inline void pushStack(Statement* stmt) {
@@ -730,13 +1028,24 @@
         flags = STMT_SUCCESS;
     }
 
-    int suspensionTimeMicroseconds() const OVERRIDE {
+    inline void clearExitRes() {
+        exitRes.value = NULL;
+    }
+
+    vmint suspensionTimeMicroseconds() const OVERRIDE {
         return suspendMicroseconds;
     }
 
     void resetPolyphonicData() OVERRIDE {
-        if (polyphonicIntMemory.empty()) return;
-        memset(&polyphonicIntMemory[0], 0, polyphonicIntMemory.size() * sizeof(int));
+        if (!polyphonicIntMemory.empty())
+            memset(&polyphonicIntMemory[0], 0, polyphonicIntMemory.size() * sizeof(vmint));
+        if (!polyphonicRealMemory.empty())
+            memset(&polyphonicRealMemory[0], 0, polyphonicRealMemory.size() * sizeof(vmfloat));
+        if (!polyphonicUnitFactorMemory.empty()) {
+            const vmint sz = polyphonicUnitFactorMemory.size();
+            for (vmint i = 0; i < sz; ++i)
+                polyphonicUnitFactorMemory[i] = VM_NO_FACTOR;
+        }
     }
 
     size_t instructionsPerformed() const OVERRIDE {
@@ -748,6 +1057,10 @@
     }
 
     void forkTo(VMExecContext* ectx) const OVERRIDE;
+
+    VMExpr* exitResult() OVERRIDE {
+        return exitRes.value;
+    }
 };
 
 } // namespace LinuxSampler