FFI: Record cdata index operations (preliminary, lots of NYI cases).

src/lj_ffrecord.h

@@ -10,6 +10,13 @@
 #include "lj_jit.h"
 
 #if LJ_HASJIT
+/* Data used by handlers to record a fast function. */
+typedef struct RecordFFData {
+  TValue *argv;		/* Runtime argument values. */
+  ptrdiff_t nres;	/* Number of returned results (defaults to 1). */
+  uint32_t data;	/* Per-ffid auxiliary data (opcode, literal etc.). */
+} RecordFFData;
+
 LJ_FUNC int32_t lj_ffrecord_select_mode(jit_State *J, TRef tr, TValue *tv);
 LJ_FUNC void lj_ffrecord_func(jit_State *J);
 #endif