A cscope-like gcc plugin

[Yunfeng ZHANG]

New feature (offsetof) has been implemented to my plugin.

Consider you've got a memory address by hardware debug tool in Linux and make
sure it refers to a variable of task_struct, now you need compute the address
of tsk->mm, but it isn't easy since there're too much members before it
    struct task_struct {
        ...
        struct sched_entity se;
        ...
        struct mm_struct *mm, *active_mm;
        ...
    };
The feature will dump member offset and struct size to database.
    ./gs offsetof task_struct mm
    ./gs sizeof task_struct

Currently, it works on gcc 4.6.3 only.
Attachment is from
    https://gccsymdb.googlecode.com/svn/trunk@43 or
    https://gccsymdb.googlecode.com/svn/tags/v4

Thanks for trying:)
                                                             Yunfeng Zhang
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