Using #pragma section funcname

[Curtis]

None of the suggestions I have received regarding getting a function size
by subtracting function pointers has been satisfactory for my 'C' compiler.
I need the size of a function in order to copy it from ROM to RAM with memcpy().

We used this in assembler as below and had no problem.

.section Psectname,code,align=2
.export _FuncName
.export _FuncSize

_FuncSize .data.w (sizeof Psectname)
_FuncName:

Is there a way to get the size with a similar preprocessor in 'C'?

#pragma section sectname
WORD funcsize = sizeof(sectname);
void funcname(void){}

When I use the above, the compiler gives me the following error.

UNDECLARED NAME: "sectname"

[Danny Kalev]

Curtis,
There's no standard way to do what you're looking for in C. A function
is not an lvalue nor is an object in the sense of a memory chunk to
which you can write. Besides, different platforms implement functions in
very different ways: how would you measure the size of a dynamically
loaded function? and what about a swapped out function? Shared
libraries? BIOS code? I think the best way to handle this is by using
assembly code but remember that it's highly machine dependent. The
technique of casting function pointers to char * and then subtracting
one from another seems to work on my machine but I can't endorse the
results.

Danny

Curtis wrote:
>
> None of the suggestions I have received regarding getting a function size
> by subtracting function pointers has been satisfactory for my 'C' compiler.
> I need the size of a function in order to copy it from ROM to RAM with memcpy().
>
> We used this in assembler as below and had no problem.
>
> .section Psectname,code,align=2
> .export _FuncName
> .export _FuncSize
>
> _FuncSize .data.w (sizeof Psectname)
> _FuncName:
>
> Is there a way to get the size with a similar preprocessor in 'C'?
>
> #pragma section sectname
> WORD funcsize = sizeof(sectname);
> void funcname(void){}
>
> When I use the above, the compiler gives me the following error.
>
> UNDECLARED NAME: "sectname"