void EmitIfConstant(EmitContext ec)
{
IntegralExpression ce = null;
if (Expression is IntegralExpression)
{
ce = (IntegralExpression)Expression;
}
bool val = ce.Value != 0;
if (!val) // emit else
{
FalseStatement.Emit(ec);
}
else
{
TrueStatement.Emit(ec);
}
}
/// <summary>
/// Emit code
/// </summary>
/// <returns>Success or fail</returns>
public override bool Emit(EmitContext ec)
{
if (Expression is IntegralExpression)
{
EmitIfConstant(ec);
}
else
{
// emit expression branchable
ec.EmitComment("if-expression evaluation");
Expression.EmitBranchable(ec, Else, false);
ec.EmitComment("(" + Expression.CommentString() + ") is true");
TrueStatement.Emit(ec);
ec.EmitInstruction(new Jump()
{
DestinationLabel = ExitIf.Name
});
ec.MarkLabel(Else);
ec.EmitComment("Else ");
FalseStatement.Emit(ec);
ec.MarkLabel(ExitIf);
}
return(true);
}
protected override void DoEmit(EmitContext ec)
{
var endLabel = ec.DefineLabel();
Condition.Emit(ec);
ec.EmitCastToBoolean(Condition.GetEvaluatedCType(ec));
if (FalseStatement == null)
{
ec.Emit(OpCode.BranchIfFalse, endLabel);
TrueStatement.Emit(ec);
}
else
{
var falseLabel = ec.DefineLabel();
ec.Emit(OpCode.BranchIfFalse, falseLabel);
TrueStatement.Emit(ec);
ec.Emit(OpCode.Jump, endLabel);
ec.EmitLabel(falseLabel);
FalseStatement.Emit(ec);
}
ec.EmitLabel(endLabel);
}