On Mon, May 23, 2016 at 5:26 AM, Basile Starynkevitch
<basile@starynkevitch.net> wrote:
Hello All,
As I explained in https://gcc.gnu.org/ml/jit/2016-q2/msg00042.html it is
difficult (or tricky without using dirty tricks involving the GCC plugin
headers) to use GCCJIT to emit code equivalent to the following C file:
extern int a;
int get_atomic_a (void) {
return __atomic_load_n (&a, __ATOMIC_SEQ_CST);
}
The issue is that __ATOMIC_SEQ_CST is a magic preprocessor (but
non-standard!) symbol which might not be available
(or might have a different value) in the C code for GCCJIT building such an
AST.
So we need a function to retrieve some magic integral value from the GCCJIT
compiler.
Huh? Why can't you just use the enum:
enum memmodel
{
MEMMODEL_RELAXED = 0,
MEMMODEL_CONSUME = 1,
MEMMODEL_ACQUIRE = 2,
MEMMODEL_RELEASE = 3,
MEMMODEL_ACQ_REL = 4,
MEMMODEL_SEQ_CST = 5,
MEMMODEL_LAST = 6,
MEMMODEL_SYNC_ACQUIRE = MEMMODEL_ACQUIRE | MEMMODEL_SYNC,
MEMMODEL_SYNC_RELEASE = MEMMODEL_RELEASE | MEMMODEL_SYNC,
MEMMODEL_SYNC_SEQ_CST = MEMMODEL_SEQ_CST | MEMMODEL_SYNC
};