----- Message d'origine ---- De : Andi Hellmund <mail@xxxxxxxxxxxxxxxx> À : charfi asma <charfiasma@xxxxxxxx> Cc : gcc-help@xxxxxxxxxxx Envoyé le : Lun 14 février 2011, 18h 48min 26s Objet : Re: [GCC front end] add new TREE CODE Hey Asma, > my question is : should I also care about how to translate those tree code al > over the compiler chain: gimple --> ssa --> unssa --> rtl --> ass ... > The idea of GCC's modularization is that a front-end should maximally care about GIMPLE. All the other transformations are done by the middle-end. > did you suggest to follow an example of an existing front end that adds some > tree code cause the C++ one seems to be mature and complete. > Yes, the C++ front-end uses quite a lot of own TREE codes, but I would then start with a very simple one and check how it "translates" the TREE codes into a GIMPLE sequence, e.g. by looking at the 'gimplify_expr' language hook which is 'cp_gimplify_expr' for C++. I hope that helps. If you have any further question about the specific transformation from TREE codes to GIMPLE, just let us know ... Andi Hello, thank you Andi and Ian for your help ;) In fact, my language is moslty like C (var, function, call exp, if else, ...) but there is some difference, for example, I have State and transitions concepts which I can translate in C (set of states presented as enumerations and transitions as array of a defined type Transition which is a struct with source state, target state, guard, ...) what I want to try, is to add a new tree codes to directly translate State, transtion, event, ... and do not use Array, enumeration of C language. Ian said in his response that if my language is very different than C I should not use trees. Have you any idea of what I can use instead ? I look at the ghdl front end and I did not find vhdl-tree.def to see if they defined a new tree code for this fe. I asked the question in their mailing list but I did not get an answer :( I will probably (as you suggested before) look at the cp front end and may be the java one also. thank you again for your help Asma
