Remove `MRB_METHOD_TABLE_INLINE`.

`MRB_METHOD_TABLE_INLINE` was fragile. It requires `-falign-functions=n`.
On platform that uses higher bits of function pointers, you can use new
`MRB_METHOD_T_STRUCT` configuration macro.

doc/guides/mrbconf.md

@@ -180,10 +180,10 @@ largest value of required alignment.
 * Ignored if `MRB_METHOD_CACHE` is not defined.
 * Need to be the power of 2.
 
-`MRB_METHOD_TABLE_INLINE`
-* Reduce the size of method table.
-* Requires LSB of function pointers to be zero.
-* For example, you might need to specify `--falign-functions=n` (where `n > 1`) for GCC.
+`MRB_METHOD_T_STRUCT`
+* Use C struct to represent `mrb_method_t`
+* No `MRB_METHOD_T_STRUCT` requires highest 2 bits of function pointers to be zero
+* Define this macro on machines that use higher bits of pointers
 
 `MRB_ENABLE_ALL_SYMBOLS`
 * Make it available `Symbols.all_symbols` in `mrbgems/mruby-symbol-ext`

include/mrbconf.h

@@ -36,10 +36,9 @@
 /* size of the method cache (need to be the power of 2) */
 //#define MRB_METHOD_CACHE_SIZE (1<<7)
 
-/* add -DMRB_METHOD_TABLE_INLINE to reduce the size of method table */
-/* MRB_METHOD_TABLE_INLINE requires LSB of function pointers to be zero */
-/* you might need to specify --falign-functions=n (where n>1) */
-//#define MRB_METHOD_TABLE_INLINE
+/* add -DMRB_METHOD_T_STRUCT on machines that use higher bits of pointers */
+/* no MRB_METHOD_T_STRUCT requires highest 2 bits of function pointers to be zero */
+//#define MRB_METHOD_T_STRUCT
 
 /* add -DMRB_INT16 to use 16bit integer for mrb_int; conflict with MRB_INT32 and MRB_INT64 */
 //#define MRB_INT16
@@ -190,10 +189,6 @@
 #  define MRB_METHOD_CACHE_SIZE (1<<10)
 # endif
 
-# ifndef MRB_METHOD_TABLE_INLINE
-#  define MRB_METHOD_TABLE_INLINE
-# endif
-
 # ifndef MRB_IV_SEGMENT_SIZE
 #  define MRB_IV_SEGMENT_SIZE 32
 # endif
@@ -212,10 +207,6 @@
 #  define MRB_METHOD_CACHE_SIZE (1<<12)
 # endif
 
-# ifndef MRB_METHOD_TABLE_INLINE
-#  define MRB_METHOD_TABLE_INLINE
-# endif
-
 # ifndef MRB_IV_SEGMENT_SIZE
 #  define MRB_IV_SEGMENT_SIZE 64
 # endif

include/mruby.h

@@ -188,7 +188,7 @@ struct mrb_context {
  */
 typedef mrb_value (*mrb_func_t)(struct mrb_state *mrb, mrb_value self);
 
-#ifdef MRB_METHOD_TABLE_INLINE
+#ifndef MRB_METHOD_T_STRUCT
 typedef uintptr_t mrb_method_t;
 #else
 typedef struct {

include/mruby/proc.h

@@ -99,7 +99,7 @@ MRB_API mrb_value mrb_proc_cfunc_env_get(mrb_state *mrb, mrb_int idx);
 
 #define MRB_METHOD_FUNC_FL 1
 #define MRB_METHOD_NOARG_FL 2
-#ifdef MRB_METHOD_TABLE_INLINE
+#ifndef MRB_METHOD_T_STRUCT
 
 #define MRB_METHOD_FUNC_P(m) (((uintptr_t)(m))&MRB_METHOD_FUNC_FL)
 #define MRB_METHOD_NOARG_P(m) (((uintptr_t)(m))&MRB_METHOD_NOARG_FL)
@@ -123,7 +123,7 @@ MRB_API mrb_value mrb_proc_cfunc_env_get(mrb_state *mrb, mrb_int idx);
 #define MRB_METHOD_PROC(m) ((m).proc)
 #define MRB_METHOD_UNDEF_P(m) ((m).proc==NULL)
 
-#endif /* MRB_METHOD_TABLE_INLINE */
+#endif /* MRB_METHOD_T_STRUCT */
 
 #define MRB_METHOD_CFUNC_P(m) (MRB_METHOD_FUNC_P(m)?TRUE:(MRB_METHOD_PROC(m)?(MRB_PROC_CFUNC_P(MRB_METHOD_PROC(m))):FALSE))
 #define MRB_METHOD_CFUNC(m) (MRB_METHOD_FUNC_P(m)?MRB_METHOD_FUNC(m):((MRB_METHOD_PROC(m)&&MRB_PROC_CFUNC_P(MRB_METHOD_PROC(m)))?MRB_PROC_CFUNC(MRB_METHOD_PROC(m)):NULL))