Hello,
Hugo Landau figured out why it didn't load:
Yes.
====================================================
The reference to cp_global_trees appears to be caused by the below code,
which only relates to C++. For C, try commenting it out like this:
OUTF (" - !compex/method\n", i);
OUTF (" name: %s\n", method_name);
OUTF (" asm: %s\n", mangled_name);
#if 0
_bool(" virtual", DECL_VIRTUAL_P(arg));
_bool(" artificial", DECL_ARTIFICIAL(arg));
_bool(" const", DECL_CONST_MEMFUNC_P(arg));
_bool(" static", DECL_STATIC_FUNCTION_P(arg));
_bool(" constructor", DECL_CONSTRUCTOR_P(arg));
_bool(" destructor", DECL_DESTRUCTOR_P(arg));
_bool(" copyconstructor", DECL_COPY_CONSTRUCTOR_P(arg));
_bool(" baseconstructor", DECL_BASE_CONSTRUCTOR_P(arg));
_bool(" completeconstructor", DECL_COMPLETE_CONSTRUCTOR_P(arg));
_bool(" completedestructor", DECL_COMPLETE_DESTRUCTOR_P(arg));
_bool(" operator", DECL_OVERLOADED_OPERATOR_P(arg));
_bool(" castoperator", DECL_CONV_FN_P(arg));
_bool(" thunk", DECL_THUNK_P(arg));
_bool(" nothrow", TYPE_NOTHROW_P(TREE_TYPE(arg)));
#endif
However, trying to run it on a C file like
struct __attribute__((compex_tag("x")))) foo { int x; };
int main(int argc, char **argv) { return 0; }
results in a segfault at this line in `_finish_type`:
const char *struct_name = decl ? IDENTIFIER_POINTER(DECL_NAME(decl)) : NULL;
It appears that the pointer DECL_NAME(decl) is corrupt, but I can't
figure out why that is. I'm no expert on writing GCC plugins and this
was an amateur attempt, I'm not sure I ever tested it with C.
====================================================
But it still has a problem...
Has this functionality been used for the C compiler, if not, how can I
debug this the easiest way?
Kind regards,
Maurice Smulders
On Fri, Apr 24, 2020 at 9:17 AM Maurice Smulders
<maurice.smuld...@genevatech.net> wrote:
>
> Hello,
>
> Is it possible to make plugins for the C compiler (not the C++)
> compiler? I was trying the (old) sample code at
> https://github.com/hlandau/compex to make a plugin, but the plugin
> only works with C++. when trying to use the C compiler it complains
> about
>
> gcc -fplugin=/usr/local/lib/compex_gcc.so -D__COMPEX__=1
> -fplugin-arg-compex_gcc-o=test_c.compex -o test_c test_c.c
> cc1: error: cannot load plugin /usr/local/lib/compex_gcc.so
> /usr/local/lib/compex_gcc.so: undefined symbol: cp_global_trees
>
> Is the mechanism differently, or are plugins even supported on the C compiler?
>
> - Maurice
--
Maurice Smulders
720-514-0310
Geneva Technologies Inc.
255 Jefferson Street, Ste 104
Monument, CO 80132
