Re : Generation of GENERIC tree

[charfi asma <charfiasma at yahoo dot fr>]

Hello
I am interested too in the GENERIC
tree
I compile hello.cpp using g++
-fdump-tree-all, I do not get a generic intermediate representation,
there was (.tu, .class, .original, .gimple, .vcg ...)
To look at the GENERIC tree, I
compile hello.java using gcj (as mentioned in the answer bellow: "I
recommend looking at any gcc frontend other than the C/C++ frontends
to see how it is done....")
But when I compile java file using
the same option (fdump-tree-all) I do not get .generic as I expect..
Before .gimple, gcj generate only .original

is the GENERIC is represented by .original ?

compiling a java file, .original looks like this:

@1      function_decl    name: @2       type: @3       scpe: @4      
                         srcp: Hello.java:0            args: @5      
                         extern         inline body: @6      
@2      identifier_node  strg: <init>   lngt: 6       
@3      method_type      size: @7       algn: 8        clas: @4      
                         retn: @8       prms: @9      
@4      record_type      name: @10      size: @11      algn: 32      
                         tag : struct   flds: @12      fncs: @1      
                         binf: @13     
@5      parm_decl        type: @14      scpe: @1       srcp: Hello.java:1      
                         argt: @14      size: @11      algn: 32   
..  


compiling a c++ file, .original looks like this:

;; Function wchar_t* std::wcschr(wchar_t*, wchar_t) (_ZSt6wcschrPww)
;; enabled by -tree-original

return <retval> = wcschr ((const wchar_t *) __p, __c);

;; Function wchar_t* std::wcspbrk(wchar_t*, const wchar_t*) (_ZSt7wcspbrkPwPKw)
;; enabled by -tree-original

return <retval> = wcspbrk ((const wchar_t *) __s1, __s2);

...

When I red the gcc internals, TREE and GENERIC representations, I expect that I will find a code like c and c++ or a tree structure with TREE_LIST, TREE_CHAIN, ...

I have to study the GENERIC form, building a metamodel for this presentation, etc. 

Can some one help me please, I am so confused.

Thank you very much.

Asma
  


----- Message d'origine ----
De : Ian Lance Taylor <iant@google.com>
À : Renuka Selvaraj <renukaselvaraj@acmet.com>
Cc : gcc-help@gcc.gnu.org
Envoyé le : Mardi, 28 Avril 2009, 16h59mn 02s
Objet : Re: Generation of GENERIC tree

"Renuka Selvaraj" <renukaselvaraj@acmet.com> writes:

> Please let me know how to generate GENERIC tree from parse tree and relative
> documents if any.

To generate GENERIC you call a bunch of buildN functions.  I recommend
looking at any gcc frontend other than the C/C++ frontends to see how it
is done (the C/C++ frontends are not great examples for this because
they actually use GENERIC as the parse tree, so they don't do any
conversion).

I unfortunately don't know of any serious documentation for this.  In
general the interface between the frontend and the middleend is not
really documented.

Ian