Change name and usage of presym macros

To be also able to build mruby without presym in the future. However,
`MRB_QSYM` has been removed and changed as follows:

### Example

|       Type                | Symbol |  Previous Style  |   New Style    |
|---------------------------|--------|------------------|----------------|
| Operator                  | &      | MRB_QSYM(and)    | MRB_OPSYM(and) |
| Class Variable            | @@foo  | MRB_QSYM(00_foo) | MRB_CVSYM(foo) |
| Instance Variable         | @foo   | MRB_QSYM(0_foo)  | MRB_IVSYM(foo) |
| Method with Bang          | foo!   | MRB_QSYM(foo_b)  | MRB_SYM_B(foo) |
| Method with Question mark | foo?   | MRB_QSYM(foo_p)  | MRB_SYM_Q(foo) |
| Mmethod with Equal        | foo=   | MRB_QSYM(foo_e)  | MRB_SYM_E(foo) |

This change makes it possible to define, for example, `MRB_IVSYM(foo)` as
`mrb_intern_lit(mrb, "@" "foo")`, which is useful if we support building
without presym in the future.

6 files changed, 13 insertions, 17 deletions

diff --git a/src/array.c b/src/array.c
index 8827cba9e..4125e876e 100644
--- a/src/array.c
+++ b/src/array.c
@@ -1314,7 +1314,7 @@ static const mrb_code each_iseq[] = {
 static const mrb_sym each_syms[] = {
   MRB_SYM(each),
   MRB_SYM(to_enum),
-  MRB_QSYM(aref),
+  MRB_OPSYM(aref),
   MRB_SYM(call),
   MRB_SYM(length),
 };
diff --git a/src/kernel.c b/src/kernel.c
index e29c33874..b98e52c42 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -564,7 +564,7 @@ obj_respond_to(mrb_state *mrb, mrb_value self)
   mrb_get_args(mrb, "n|b", &id, &priv);
   respond_to_p = basic_obj_respond_to(mrb, self, id, !priv);
   if (!respond_to_p) {
-    rtm_id = MRB_QSYM(respond_to_missing_p);
+    rtm_id = MRB_SYM_Q(respond_to_missing);
     if (basic_obj_respond_to(mrb, self, rtm_id, !priv)) {
       mrb_value args[2], v;
       args[0] = mrb_symbol_value(id);
@@ -581,7 +581,7 @@ mrb_obj_ceqq(mrb_state *mrb, mrb_value self)
 {
   mrb_value v = mrb_get_arg1(mrb);
   mrb_int i, len;
-  mrb_sym eqq = MRB_QSYM(eqq);
+  mrb_sym eqq = MRB_OPSYM(eqq);
   mrb_value ary;
 
   if (mrb_array_p(self)) {
diff --git a/src/object.c b/src/object.c
index aaab4022d..bf4d743ff 100644
--- a/src/object.c
+++ b/src/object.c
@@ -58,7 +58,7 @@ mrb_equal(mrb_state *mrb, mrb_value obj1, mrb_value obj2)
       return TRUE;
   }
 #endif
-  result = mrb_funcall_id(mrb, obj1, MRB_QSYM(eq), 1, obj2);
+  result = mrb_funcall_id(mrb, obj1, MRB_OPSYM(eq), 1, obj2);
   if (mrb_test(result)) return TRUE;
   return FALSE;
 }
@@ -660,5 +660,5 @@ MRB_API mrb_bool
 mrb_eql(mrb_state *mrb, mrb_value obj1, mrb_value obj2)
 {
   if (mrb_obj_eq(mrb, obj1, obj2)) return TRUE;
-  return mrb_test(mrb_funcall_id(mrb, obj1, MRB_QSYM(eql_p), 1, obj2));
+  return mrb_test(mrb_funcall_id(mrb, obj1, MRB_SYM_Q(eql), 1, obj2));
 }
diff --git a/src/proc.c b/src/proc.c
index 732e94817..d58d9d0df 100644
--- a/src/proc.c
+++ b/src/proc.c
@@ -315,7 +315,7 @@ mrb_init_proc(mrb_state *mrb)
   p = mrb_proc_new(mrb, &call_irep);
   MRB_METHOD_FROM_PROC(m, p);
   mrb_define_method_raw(mrb, mrb->proc_class, MRB_SYM(call), m);
-  mrb_define_method_raw(mrb, mrb->proc_class, MRB_QSYM(aref), m);
+  mrb_define_method_raw(mrb, mrb->proc_class, MRB_OPSYM(aref), m);
 
   mrb_define_class_method(mrb, mrb->kernel_module, "lambda", proc_lambda, MRB_ARGS_NONE()|MRB_ARGS_BLOCK()); /* 15.3.1.2.6  */
   mrb_define_method(mrb, mrb->kernel_module,       "lambda", proc_lambda, MRB_ARGS_NONE()|MRB_ARGS_BLOCK()); /* 15.3.1.3.27 */
diff --git a/src/symbol.c b/src/symbol.c
index add093d14..7a352a477 100644
--- a/src/symbol.c
+++ b/src/symbol.c
@@ -13,12 +13,8 @@
 #include <mruby/class.h>
 
 #undef MRB_PRESYM_MAX
-#undef MRB_PRESYM_CSYM
-#undef MRB_PRESYM_QSYM
-#undef MRB_PRESYM_SYM
-#define MRB_PRESYM_CSYM(sym, num) {#sym,sizeof(#sym)-1},
-#define MRB_PRESYM_QSYM(str, name, num) {str,sizeof(str)-1},
-#define MRB_PRESYM_SYM(str, num) {str,sizeof(str)-1},
+#define MRB_PRESYM_NAMED(lit, num, type, name) {lit, sizeof(lit)-1},
+#define MRB_PRESYM_UNNAMED(lit, num) {lit, sizeof(lit)-1},
 
 static const struct {
   const char *name;
diff --git a/src/vm.c b/src/vm.c
index 537ef6913..7b37ac38f 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -2261,7 +2261,7 @@ RETRY_TRY_BLOCK:
     OP_MATH_CASE_STRING_##op_name();                                        \
     default:                                                                \
       c = 1;                                                                \
-      mid = MRB_QSYM(op_name);                                              \
+      mid = MRB_OPSYM(op_name);                                              \
       goto L_SEND_SYM;                                                      \
   }                                                                         \
   NEXT;
@@ -2347,7 +2347,7 @@ RETRY_TRY_BLOCK:
 #endif
       default:
         c = 1;
-        mid = MRB_QSYM(div);
+        mid = MRB_OPSYM(div);
         goto L_SEND_SYM;
       }
 
@@ -2366,7 +2366,7 @@ RETRY_TRY_BLOCK:
     default:                                                                \
       SET_INT_VALUE(mrb,regs[a+1], b);                                      \
       c = 1;                                                                \
-      mid = MRB_QSYM(op_name);                                              \
+      mid = MRB_OPSYM(op_name);                                              \
       goto L_SEND_SYM;                                                      \
   }                                                                         \
   NEXT;
@@ -2412,7 +2412,7 @@ RETRY_TRY_BLOCK:
     break;\
   default:\
     c = 1;\
-    mid = MRB_QSYM(sym);\
+    mid = MRB_OPSYM(sym);\
     goto L_SEND_SYM;\
   }\
   if (result) {\
@@ -2441,7 +2441,7 @@ RETRY_TRY_BLOCK:
     break;\
   default:\
     c = 1;\
-    mid = MRB_QSYM(sym);\
+    mid = MRB_OPSYM(sym);\
     goto L_SEND_SYM;\
   }\
   if (result) {\