[cfe-dev] Adding C++ code with a plugin

[Vassil Vassilev]

Hi,
   I found out that 
http://llvm.org/viewvc/llvm-project?view=rev&revision=124217. It adds 
custom attribute.
Vassil
On 08/01/2011 08:30 AM, François-Xavier Bourlet wrote:
> Hi,
>
> I am trying to do the same kind of things! And I ended up at the same
> point as you. Glad that I am not alone trying to rewrite the AST
> trough a plugin ;)
>
> In my case what I want to do is add new custom attribute and modify
> the AST in consequence.
>
> C++0x propose a standard way to define compiler specific attribute using [[ ]]:
>
> [[some_attr_namespace::attr]]
> void myfunc(){};
>
> etc.
>
> I want to change the AST nodes decorated with some custom attribute.
> As example, I would like to be able to transform something like that:
>
> [[coroutine::generator]]
> int range(int min, int max) {
>    while (min != max) {
>      yield(min++);
>    }
> }
>
> to something like:
>
> void range_(coroutine::Yielder<int>  yield, int min, int max) {
>    while (min != max) {
>      yield(min++);
>    }
> }
> coroutine::generator_builder<int (coroutine::Yielder<int>  yield, int,
> int)>  range(&range_);
>
> If it's necessary to patch clang to add a new kind of plugin/new
> plugin feature to allow AST modification in the middle of the
> compilation process, I am willing to try doing it!
>
> Thanks a lots for any answers.
>
> Thanks also for this wonderful C++ compiler guys. Really.
>
> On Thu, Jul 21, 2011 at 8:50 AM, Benjamin Orgogozo
> <benjamin.orgogozo at normalesup.org>  wrote:
>> Hello,
>>
>> I'm new to this mailing-list and to CLANG in general so please forgive me if I
>> ask a quite stupid question...
>>
>> I've been reading a few mailing lists and webpages on CLANG now but I can't find
>> a clear answer to my question so I hope someone here could at least point me to
>> the correct resource.
>>
>> My goal is simple: I want to compile a C++ code but after automatically adding a
>> few lines of code. Here are my question:
>>
>> - can (or want) I do that with a plugin? At the beginning I wanted to write a
>> plugin to the front-end and change the AST but it seems (but I hope I'm wrong)
>> that when I use the "load" and "plugin" command line option, I can't generate
>> code at the end. Is it true or not?
>>
>> - How should I do this transformation? The code I want to add is really simple:
>> I just want to add function calls in the constructor of classes with specific
>> class members as parameters.
>> For example, I want to transform:
>>
>> class A {
>>   float f;
>> };
>> class foo {
>>   int bar;
>>
>>   foo() {}
>> };
>>
>> into
>>
>> class A {
>>   float f;
>> };
>> class foo {
>>   int bar;
>>
>>   foo() {baz(bar);}
>> };
>>
>> It seems that I have two options:
>>   * use a rewriter to add nodes within the AST, but it seems that it's only for
>> source to source transformation (and I would like to avoid that if possible).
>>   * use a TreeTransform which looks fine but I think I read somewhere that it
>> modifiying the AST for compiling it later wasn't always a good idea.
>>
>>
>>
>> > From what I understood, it seems that I want to use treetransform, but I wonder
>> if I can use it within a plugin *and* generate code with only one call to clang.
>>
>>
>> Any comment and pointer is more than welcome!
>>
>> Thanks,
>>
>> --
>>   Benjamin Orgogozo
>>
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>>
>
>