RE: The AST tree modification. Edited.

[Iyer, Balaji V]

Hello,
        For most of the things you are looking for, please look for a function 
called build_decl. It is used in several places inside GCC. Let me give you a 
small example, 

If you do the following:

tree x = build_decl (UNKNOWN_LOCATION, VAR_DECL, get_identifer("ii"), 
integer_type_node)

you will declare a variable called "ii" of type "integer."

Similarly, to create a new internal structure, if do something like this:

tree struct_frame = lang_hooks.make_type (RECORD_TYPE);
tree struct_field = build_decl (UNKNOWN_LOCATION, FIELD_DECL, 
get_identifier("variable"), integer_type_node)
TREE_CHAIN(struct_field) = struct_frame

You will create the following internal structure

struct {
   int variable;
}

I hope this helps you get started.

Thanks,

Balaji V .Iyer.

-----Original Message-----
From: niXman [mailto:i.nix...@gmail.com] 
Sent: Monday, October 03, 2011 6:51 PM
To: gcc@gcc.gnu.org
Subject: The AST tree modification. Edited.

Hi everybody!
It is necessary to implement a plug-in for GCC designed to collect the 
information on types of translation unit, and generate static const array of 
types rtti_ex _ on its base;  //////////////////////////////////////
enum class type_ {
   char_, uchar_, short_, ushort_, int_, uint_, long_, ulong_,
   int64_, uint64_, array_, pointer_, double_, long_double_, float_,
   class_
};

struct rtti_ex_ { // <<<<<<<<<<<<<<<<<<<<<<<<<
   const char* name;
   const type_ type;
   const size_t size;
   const size_t align;
   const size_t offset;
};

// generated from plugin.
static const rtti_ex_ rtti_ex_array_[] = {
   {...},
   {...},
   {...}
};
/////////////////////////////////////

There aren't any problems with information collection from AST. There is a 
complexity with AST modification:
1. How to declare a variable?
2. How to declare the typedef?
3. How to declare a structure?
4. How to declare an array of structures?
I suppose that there should be a function like: tree make_subtree (const char* 
source); which result I could insert in the corresponding node. But I haven't 
found it.

Please, give me some links on this subject. It is very desirable, if you could 
give some links with examples.

Thanks.