Hi,
I discovered the gcc-plugin and I should be able to extend the existing
gcc to
add a feature that "&aObj->obj" == aObj. This mean that I can suppress the
error message and just to an IMPLICIT Pointer-Cast from (struct A) to
(struct base)
the gcc-plugin-docu is available at:
http://gcc.gnu.org/onlinedocs/gccint/Plugins.html#Plugins
now I missing a good starting point, for example I don't know which
callback I have to call.
→ is probably any help available ?
On 03.02.20 08:21, aotto wrote:
Hi, the following scenario has a "definition hole" in the "C" language
code example:
-------------------------
struct base {
...
};
struct A {
struct base obj;
...
} aObj;
struct B {
struct base obj;
...
} bObj;
void method_base (struct base * hdl, ...);
method_base(&aObj, ...)
method_base(&bObj, ...)
------------------------
- a POINTER to "A" is also a valid POINTER to "base"
- a POINTER to "B" is also a valid POINTER to "base"
- a POINTER to "base" is NOT a valid POINTER to "A" and "B"
I require a solution for this problem WITHOUT forced pointer cast
code and without "void* and type-check" inflation.
The following solutions are acceptable:
1. "gcc" discover by its own that "base" is a "friend" of "A" and "B".
2. add a "frienddef" keyword like "typedef" using:
typedef struct base * baseP;
typedef struct A * aP;
typedef struct P * bP;
frienddef baseP aP;
frienddef baseP bP;
3. add a #PRAGMA to enable/disable this feature
4. add a "gcc" api to easy extend "GCC" without being FORCED
to "hack" the core.
thanks for your help
