Major redesign of function call handling.

Drop call gates. Use function headers, dispatched like bytecodes.
Emit BC_FUNCF/BC_FUNCV bytecode at PC 0 for all Lua functions.
C functions and ASM fast functions get extra bytecodes.
Modify internal calling convention: new base in BASE (formerly in RA).
Can now use better C function wrapper semantics (dynamic on/off).
Prerequisite for call hooks with zero-overhead if disabled.
Prerequisite for compiling recursive calls.
Prerequisite for efficient 32/64 bit prototype guards.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/lj_lib.h b/src/lj_lib.h
index 44be96b9..fd2b025c 100644
--- a/src/lj_lib.h
+++ b/src/lj_lib.h
@@ -57,6 +57,19 @@ LJ_FUNC int lj_lib_checkopt(lua_State *L, int narg, int def, const char *lst);
 #define lj_lib_checkfpu(L)      UNUSED(L)
 #endif
 
+/* Push internal function on the stack. */
+static LJ_AINLINE void lj_lib_pushcc(lua_State *L, lua_CFunction f,
+                                     int id, int n)
+{
+  GCfunc *fn;
+  lua_pushcclosure(L, f, n);
+  fn = funcV(L->top-1);
+  fn->c.ffid = (uint8_t)id;
+  setmref(fn->c.pc, &G(L)->bc_cfunc_int);
+}
+
+#define lj_lib_pushcf(L, fn, id)        (lj_lib_pushcc(L, (fn), (id), 0))
+
 /* Library function declarations. Scanned by buildvm. */
 #define LJLIB_CF(name)          static int lj_cf_##name(lua_State *L)
 #define LJLIB_ASM(name)         static int lj_ffh_##name(lua_State *L)