Rename `MRB_METHOD_T_STRUCT` to `MRB_USE_METHOD_T_STRUCT`.

It's the first change of renaming configuration options to `MRB_XXX` to
`MRB_USE_XXX` or `MRB_NO_XXX`.

doc/guides/mrbconf.md

@@ -171,9 +171,9 @@ largest value of required alignment.
 * Ignored if `MRB_NO_METHOD_CACHE` is defined.
 * Need to be the power of 2.
 
-`MRB_METHOD_T_STRUCT`
+`MRB_USE_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
+* No `MRB_USE_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`

include/mrbconf.h

@@ -47,13 +47,13 @@
 /* size of the method cache (need to be the power of 2) */
 //#define MRB_METHOD_CACHE_SIZE (1<<8)
 
-/* 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 */
-#ifndef MRB_METHOD_T_STRUCT
+/* add -DMRB_USE_METHOD_T_STRUCT on machines that use higher bits of function pointers */
+/* no MRB_USE_METHOD_T_STRUCT requires highest 2 bits of function pointers to be zero */
+#ifndef MRB_USE_METHOD_T_STRUCT
   // can't use highest 2 bits of function pointers at least on 32bit
   // Windows and 32bit Linux.
 # ifdef MRB_32BIT
-#   define MRB_METHOD_T_STRUCT
+#   define MRB_USE_METHOD_T_STRUCT
 # endif
 #endif
 

include/mruby.h

@@ -199,7 +199,7 @@ struct mrb_context {
  */
 typedef mrb_value (*mrb_func_t)(struct mrb_state *mrb, mrb_value self);
 
-#ifndef MRB_METHOD_T_STRUCT
+#ifndef MRB_USE_METHOD_T_STRUCT
 typedef uintptr_t mrb_method_t;
 #else
 typedef struct {

include/mruby/proc.h

@@ -101,7 +101,8 @@ 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
-#ifndef MRB_METHOD_T_STRUCT
+
+#ifndef MRB_USE_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)
@@ -125,7 +126,7 @@ 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_T_STRUCT */
+#endif /* MRB_USE_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))