[dmd-internals] Modifying the dmd compiler to add support for bitfields

[Sandeep Datta]

[Cross post from the D news group]

Hi All,

To gain a better understanding of how the D compiler works I am
trying to implement support for bit fields in structures. I have
modified the parser code to admit the following syntax (for now)...

struct A{
    uint:8 a;
    uint:5 b;
    uint:* unused; //Takes up the remaining space.
    //Raise an error when the computed size is zero.
}

You can see my changes here...https://github.com/SDX2000/dmd

I have been trying to work out a strategy for modifying the compiler
code generation for quite some time now but haven't been able to
make much headway in this direction.

 I would appreciate any help at this point.

Regards,
Sandeep Datta.
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