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Re: Question about Gimple FE

On Mon, Mar 30, 2015 at 11:36 AM, Richard Biener
<> wrote:
> On Fri, Mar 27, 2015 at 4:00 PM, xue yinsong <> wrote:
>> Thanks for your reply to my proposal.
>> AFAIS, most of the files generated by -fdump-tree-all are presented in C-like form instead
>> of in lisp-like tuple form.
>> So itâs better to implement a front end for the C-like gimple representations.
>> I want to make sure if I get the idea right.
>> Besides, Iâm uncertain about the following questions:
>> 1.I suppose the syntax of the original gimple file generated by -fdump-tree-gimple would cover
>> the syntax of those generated in later stages. Could some one tell me if thatâs correct?
> Well - in 004t.gimple there is still no CFG and we are not in SSA
> form, so syntax of 'gimple'
> would change slightly dependent on properties of the IL.  GCC goes to
> various lowering stages
> (also for things like OpenMP, nested function and exception handling support).

Btw, I wouldn't necessarily try to parse exactly those dump format -
streamlining it for
easier parsing would be ok, especially for the basic-block markers.
There was a request
multiple times to make it easier to adjust a function cut&pasted from
a dump produced
by -fdump-tree to valid C (thus accepted by gcc).  One annoying
road-block is how we
dump labels and goto destinations.

>> 2.On my computer, it seems both -fdump-tree-gimple and -fdump-tree-gimple-raw dump the code to <filename>.004t.gimple.
>> tf -fdump-tree-all is used, only the result of -fdump-tree-gimple will be presented.
>> Does gcc behave this way on purpose?
> I think so.  -raw is a dump modifier while -all selects '-gimple' and
> all others.
> Richard.
>> ââ
>> Best regards,
>> Yinsong Xue

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