public void GenerateDouble(ILGenerator generator, FunctionSet set, FunctionParams pars)
{
// We check constants.
double s1, s2;
if (src2.HasConstantValue(set, pars, out s2))
{
if (src1.HasConstantValue(set, pars, out s1))
{
generator.Emit(OpCodes.Ldc_R8, s1 / s2);
return;
}
else
{
// Because division sucks, we convert it to multiplication.
double inv_s2 = 1.0 / s2;
src1.GenerateDouble(generator, set, pars);
generator.Emit(OpCodes.Ldc_R8, inv_s2);
generator.Emit(OpCodes.Mul);
return;
}
}
src1.GenerateDouble(generator, set, pars);
src2.GenerateDouble(generator, set, pars);
// We just generate add.
generator.Emit(OpCodes.Div);
}
public bool HasConstantValue(FunctionSet set, FunctionParams pars, out double val)
{
double s1, s2;
if (src1.HasConstantValue(set, pars, out s1))
{
if (src2.HasConstantValue(set, pars, out s2))
{
val = s1 * s2;
return(true);
}
// We check if src is 0.0.
if (s1 == 0.0)
{
val = 0.0;
return(true);
}
}
// Src2 may be 0.0.
if (src2.HasConstantValue(set, pars, out s2))
{
if (s2 == 0.0)
{
val = 0.0;
return(true);
}
}
val = 0.0;
return(false);
}
public bool HasConstantValue(FunctionSet set, FunctionParams pars, out double val)
{
double s1, s2;
if (src1.HasConstantValue(set, pars, out s1))
{
if (src2.HasConstantValue(set, pars, out s2))
{
val = global::System.Math.Pow(s1, s2);
return(true);
}
// Anything 1.0^x is 1.0.
if (s1 == 1.0)
{
val = 1.0;
return(true);
}
}
if (src2.HasConstantValue(set, pars, out s2))
{
// Anything x^0.0 is 1.0 (except 0.0^0.0 what is not defined ...).
if (s2 == 0.0)
{
val = 1.0;
return(true);
}
}
val = 0.0;
return(false);
}
/// <summary>
/// Obtains floating point function (64-bit). If expression is in vector form,
/// this will return the function defined for x.
/// </summary>
/// <param name="m">The module we should append this delegate to.</param>
/// <param name="set">The function set, use null or FunctionSet.Default if you do not
/// want anything specific.</param>
/// <param name="pars">The parameters, cannot be null.</param>
public Function4d GetFunction4d([NotNull] FunctionParams pars, FunctionSet set, [NotNull] Module m)
{
if (pars.Creator != this)
{
throw new ArgumentException("Parameters not generated by expression.");
}
if (!pars.IsDefined)
{
throw new ArgumentException("The parameters for the function are not defined fully.");
}
if (pars.VariableCount > 4)
{
throw new ArgumentException("Too many variables are used for 4D function.");
}
lock (root)
{
if (set == null)
{
set = FunctionSet.Default;
}
// We define method.
DynamicMethod method = new DynamicMethod(name + "4d", typeof(double), new Type[] { typeof(double), typeof(double),
typeof(double), typeof(double) }, m);
// We emit body.
ILGenerator g = method.GetILGenerator();
root.GenerateDouble(g, set, pars);
g.Emit(OpCodes.Ret);
// We create delegate.
return((Function4d)method.CreateDelegate(typeof(Function4d)));
}
}
public bool HasConstantValue(FunctionSet set, FunctionParams pars, out double val)
{
double s1, s2;
if (src2.HasConstantValue(set, pars, out s2) && src1.HasConstantValue(set, pars, out s1))
{
val = s1 / s2;
return(true);
}
val = 0.0;
return(false);
}
public bool HasConstantValue(FunctionSet set, FunctionParams pars, out double val)
{
// We have constant value if and only if subelement is constant.
double[] v = new double[arguments.Length];
int index = 0;
foreach (IElement el in arguments)
{
if (el.HasConstantValue(set, pars, out v[index]))
{
continue;
}
val = 0.0;
return(false);
}
// We find delegate
Delegate s = null;
switch (arguments.Length)
{
case 1:
s = set.Findd(Name);
break;
case 2:
s = set.Find2d(Name);
break;
case 3:
s = set.Find3d(Name);
break;
case 4:
s = set.Find4d(Name);
break;
default:
throw new InvalidMathExpression("Trying to call method with more then 4 arguments, unsuported.");
}
if (s == null)
{
throw new InvalidMathExpression("We cannot compile expression because the function " +
Name + " does not exist in set.");
}
// We execute it.
val = (double)s.DynamicInvoke(v[0]);
return(true);
}
public void GenerateDouble(ILGenerator generator, FunctionSet set, FunctionParams pars)
{
// We check if we have const value expression.
double constValue;
if (HasConstantValue(set, pars, out constValue))
{
generator.Emit(OpCodes.Ldc_R8, constValue);
return;
}
foreach (IElement el in arguments)
{
el.GenerateDouble(generator, set, pars);
}
// We perform the call of this function. The function is prototyped
// float F(float x).
Delegate s = null;
switch (arguments.Length)
{
case 1:
s = set.Findd(Name);
break;
case 2:
s = set.Find2d(Name);
break;
case 3:
s = set.Find3d(Name);
break;
case 4:
s = set.Find4d(Name);
break;
default:
throw new InvalidMathExpression("Trying to call method with more then 4 arguments, unsuported.");
}
if (s == null)
{
throw new InvalidMathExpression("We cannot compile expression because the function " +
Name + " does not exist in set.");
}
// Call the method with argument.
generator.EmitCall(OpCodes.Call, s.Method, null);
}
public void GenerateDouble(ILGenerator generator, FunctionSet set, FunctionParams pars)
{
double val;
if (HasConstantValue(set, pars, out val))
{
generator.Emit(OpCodes.Ldc_R8, val);
return;
}
src1.GenerateDouble(generator, set, pars);
src2.GenerateDouble(generator, set, pars);
// We just generate add.
generator.Emit(OpCodes.Mul);
}
static FunctionSet()
{
Default = new FunctionSet();
// Append some defaults.
Default.Add("sin", Sin, global::System.Math.Sin);
Default.Add("cos", Cos, global::System.Math.Cos);
Default.Add("sqrt", Sqrt, global::System.Math.Sqrt);
Default.Add("tan", Tan, global::System.Math.Tan);
Default.Add("asin", Asin, global::System.Math.Asin);
Default.Add("acos", Acos, global::System.Math.Acos);
Default.Add("atan", Atan, global::System.Math.Atan);
Default.Add("log", Log, global::System.Math.Log);
Default.Add("ln", Ln, global::System.Math.Log);
Default.Add("exp", Exp, global::System.Math.Exp);
Default.Add("floor", Floor, global::System.Math.Floor);
Default.Add("trunc", Truncate, global::System.Math.Truncate);
}
public void GenerateDouble(ILGenerator generator, FunctionSet set, FunctionParams pars)
{
if (isNumeric)
{
// We push argument on stack.
generator.Emit(OpCodes.Ldc_R8, numericValue);
}
else
{
// Check for binding.
if (pars.HasBinding(value))
{
VariableBinding binding;
pars.GetBinding(value, out binding);
switch (binding.Position)
{
case 0:
generator.Emit(OpCodes.Ldarg_0);
break;
case 1:
generator.Emit(OpCodes.Ldarg_1);
break;
case 2:
generator.Emit(OpCodes.Ldarg_2);
break;
case 3:
generator.Emit(OpCodes.Ldarg_3);
break;
default:
throw new InvalidMathExpression("Trying non-used position.");
}
}
else
{
// Must succeed.
double v = pars[value];
generator.Emit(OpCodes.Ldc_R8, v);
}
}
}
public void GenerateDouble(ILGenerator generator, FunctionSet set, FunctionParams pars)
{
double val;
if (HasConstantValue(set, pars, out val))
{
generator.Emit(OpCodes.Ldc_R8, val);
return;
}
// We must make sure all params are in double form!
src1.GenerateDouble(generator, set, pars);
src2.GenerateDouble(generator, set, pars);
// We generate the call on those two params.
PowDelegate pow = global::System.Math.Pow;
generator.EmitCall(OpCodes.Call, pow.Method, null);
}
public bool HasConstantValue(FunctionSet set, FunctionParams pars, out double val)
{
if (isNumeric)
{
val = numericValue;
return(true);
}
// Parameters (not variables) are also constants.
if (pars.HasBinding(value))
{
val = 0.0;
return(false);
}
else
{
val = pars[value];
return(true);
}
}
/// <summary>
/// Evaluates constant expression
/// </summary>
/// <returns></returns>
public double Evalf([NotNull] FunctionParams pars, FunctionSet set, Module m)
{
if (pars.Creator != this)
{
throw new ArgumentException("Parameters not generated by expression.");
}
if (!pars.IsDefined)
{
throw new ArgumentException("The parameters for the function are not defined fully.");
}
if (pars.VariableCount > 0)
{
throw new ArgumentException("Too many variables are used for constant function.");
}
lock (root)
{
if (set == null)
{
set = FunctionSet.Default;
}
if (pars == null)
{
throw new ArgumentNullException("The parameters of function are null.");
}
// We define method.
DynamicMethod method = new DynamicMethod(name + "f", typeof(float), new Type[] { }, m);
// We emit body.
ILGenerator g = method.GetILGenerator();
root.GenerateSingle(g, set, pars);
g.Emit(OpCodes.Ret);
// We create delegate.
return(((ConstFunctionf)method.CreateDelegate(typeof(ConstFunctionf)))());
}
}
/// <summary>
/// Obtains floating point function (64-bit). If expression is in vector form,
/// this will return the function defined for x.
/// </summary>
/// <param name="set">The function set, use null or FunctionSet.Default if you do not
/// want anything specific.</param>
/// <param name="pars">The parameters, cannot be null.</param>
public Function4d GetFunction4d(FunctionParams p, FunctionSet set)
{
return(GetFunction4d(p, set, typeof(Expression).Module));
}
