Wait i think i found what i need in gcc/c/c-typeck.c and c-parser.c:
c_begin_stmt_expr and c_finish_stmt_expr.
Thanks again
--Phil
On 6 February 2014 15:31, Philip Herron <redbrain@xxxxxxxxxxx> wrote:
> Hey
>
> Thanks for that didn't realise you could do that. I guess does this
> mean i could do:
>
> MODIFY_EXPR price = stmt_list
>
> And gimple will be nice to me? Wo i am so impressed by this.
>
> --Phil
>
> On 6 February 2014 12:34, Florian Weimer <fweimer@xxxxxxxxxx> wrote:
>> On 02/06/2014 01:14 PM, Philip Herron wrote:
>>
>>> I am trying to understand what way i could compile this in GCC can you
>>> do the following in GENERIC make a nested function decl kind of like a
>>> closure not quite sure what to do here.
>>
>>
>> It's just a statement expression. The C front end supports them, so this
>> might give you some idea how to implement them.
>>
>>
>> void main (void) {
>> const char * item = "test";
>> const double price = ({
>>
>> double ret_tmp;
>> if (item == "salad") {
>> ret_tmp = 3.50;
>> }
>> else if (item == "muffin") {
>> ret_tmp = 2.25;
>> }
>> else {
>> ret_tmp = 2.00;
>> }
>> ret_tmp;
>> });
>> }
>>
>> To compile general closures, you have to apply a transformation called
>> closure conversion. GCC's nested functions only provide downward closures,
>> and require an executable stack for trampolines on most architectures, which
>> many systems do not support.
>>
>> --
>> Florian Weimer / Red Hat Product Security Team
