public override bool Emit(EmitContext ec)
{
Expression.EmitToStack(ec);
ec.EmitComment("!" + Expression.CommentString());
ec.EmitPop(RegistersEnum.AX);
ec.EmitInstruction(new Not()
{
DestinationReg = RegistersEnum.AX, Size = 80
});
ec.EmitInstruction(new And()
{
DestinationReg = RegistersEnum.AX, SourceValue = 1, Size = 80
});
ec.EmitPush(RegistersEnum.AX);
return(true);
}
/// <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);
}
public override string CommentString()
{
return("!" + Expression.CommentString());
}