GNU lightning uses the special _jit identifier. To be able
to be able to use multiple jit generation states at the same
time, it is required to used code similar to:
struct jit_state lightning;
#define lightning _jit
This will cause the symbol defined to _jit to be passed as
the first argument to the underlying GNU lightning implementation,
that is usually a function with an _ (underscode) prefix
and with an argument named _jit, in the pattern:
static void _jit_mnemonic(jit_state_t *, jit_gpr_t, jit_gpr_t);
#define jit_mnemonic(u, v) _jit_mnemonic(_jit, u, v);
The reason for this is to use the same syntax as the initial lightning implementation and to avoid needing the user to keep adding an extra argument to every call, as multiple jit states generating code in paralell should be very uncommon.