Provide functions that take symbols instead of `const char*`.

- mrb_define_class_id
- mrb_define_module_id
- mrb_define_method_id
- mrb_define_singleton_method_id
- mrb_define_module_function_id
- mrb_define_const_id
- mrb_undef_method_id
- mrb_undef_class_method_id
- mrb_class_defined_id
- mrb_class_get_id
- mrb_class_defined_under_id
- mrb_class_get_under_id
- mrb_module_get_id
- mrb_module_get_under_id
- mrb_define_class_under_id
- mrb_define_module_under_id
- mrb_exc_get_id

include/mruby.h

@@ -695,8 +695,8 @@ MRB_API struct RClass* mrb_class_get_id(mrb_state *mrb, mrb_sym name);
  * @param name The name of the class.
  * @return [struct RClass *] A reference to the class.
 */
-MRB_API struct RClass* mrb_exc_get(mrb_state *mrb, const char *name);
 MRB_API struct RClass* mrb_exc_get_id(mrb_state *mrb, mrb_sym name);
+#define mrb_exc_get(mrb, name) mrb_exc_get_id(mrb, mrb_intern_cstr(mrb, name))
 
 /**
  * Returns an mrb_bool. True if inner class was defined, and false if the inner class was not defined.
@@ -1298,25 +1298,25 @@ MRB_API mrb_value mrb_vformat(mrb_state *mrb, const char *format, va_list ap);
    + those E_* macros requires mrb_state* variable named mrb.
    + exception objects obtained from those macros are local to mrb
 */
-#define E_RUNTIME_ERROR             (mrb_exc_get(mrb, "RuntimeError"))
-#define E_TYPE_ERROR                (mrb_exc_get(mrb, "TypeError"))
-#define E_ARGUMENT_ERROR            (mrb_exc_get(mrb, "ArgumentError"))
-#define E_INDEX_ERROR               (mrb_exc_get(mrb, "IndexError"))
-#define E_RANGE_ERROR               (mrb_exc_get(mrb, "RangeError"))
-#define E_NAME_ERROR                (mrb_exc_get(mrb, "NameError"))
-#define E_NOMETHOD_ERROR            (mrb_exc_get(mrb, "NoMethodError"))
-#define E_SCRIPT_ERROR              (mrb_exc_get(mrb, "ScriptError"))
-#define E_SYNTAX_ERROR              (mrb_exc_get(mrb, "SyntaxError"))
-#define E_LOCALJUMP_ERROR           (mrb_exc_get(mrb, "LocalJumpError"))
-#define E_REGEXP_ERROR              (mrb_exc_get(mrb, "RegexpError"))
-#define E_FROZEN_ERROR              (mrb_exc_get(mrb, "FrozenError"))
-
-#define E_NOTIMP_ERROR              (mrb_exc_get(mrb, "NotImplementedError"))
+#define E_RUNTIME_ERROR             (mrb_exc_get_id(mrb, MRB_SYM(RuntimeError)))
+#define E_TYPE_ERROR                (mrb_exc_get_id(mrb, MRB_SYM(TypeError)))
+#define E_ARGUMENT_ERROR            (mrb_exc_get_id(mrb, MRB_SYM(ArgumentError)))
+#define E_INDEX_ERROR               (mrb_exc_get_id(mrb, MRB_SYM(IndexError)))
+#define E_RANGE_ERROR               (mrb_exc_get_id(mrb, MRB_SYM(RangeError)))
+#define E_NAME_ERROR                (mrb_exc_get_id(mrb, MRB_SYM(NameError)))
+#define E_NOMETHOD_ERROR            (mrb_exc_get_id(mrb, MRB_SYM(NoMethodError)))
+#define E_SCRIPT_ERROR              (mrb_exc_get_id(mrb, MRB_SYM(ScriptError)))
+#define E_SYNTAX_ERROR              (mrb_exc_get_id(mrb, MRB_SYM(SyntaxError)))
+#define E_LOCALJUMP_ERROR           (mrb_exc_get_id(mrb, MRB_SYM(LocalJumpError)))
+#define E_REGEXP_ERROR              (mrb_exc_get_id(mrb, MRB_SYM(RegexpError)))
+#define E_FROZEN_ERROR              (mrb_exc_get_id(mrb, MRB_SYM(FrozenError)))
+
+#define E_NOTIMP_ERROR              (mrb_exc_get_id(mrb, MRB_SYM(NotImplementedError)))
 #ifndef MRB_WITHOUT_FLOAT
-#define E_FLOATDOMAIN_ERROR         (mrb_exc_get(mrb, "FloatDomainError"))
+#define E_FLOATDOMAIN_ERROR         (mrb_exc_get_id(mrb, MRB_SYM(FloatDomainError)))
 #endif
 
-#define E_KEY_ERROR                 (mrb_exc_get(mrb, "KeyError"))
+#define E_KEY_ERROR                 (mrb_exc_get_id(mrb, MRB_SYM(KeyError)))
 
 MRB_API mrb_value mrb_yield(mrb_state *mrb, mrb_value b, mrb_value arg);
 MRB_API mrb_value mrb_yield_argv(mrb_state *mrb, mrb_value b, mrb_int argc, const mrb_value *argv);
@@ -1346,6 +1346,7 @@ MRB_INLINE void mrb_check_frozen(mrb_state *mrb, void *o)
 }
 
 MRB_API void mrb_define_alias(mrb_state *mrb, struct RClass *c, const char *a, const char *b);
+MRB_API void mrb_define_alias_id(mrb_state *mrb, struct RClass *c, mrb_sym a, mrb_sym b);
 MRB_API const char *mrb_class_name(mrb_state *mrb, struct RClass* klass);
 MRB_API void mrb_define_global_const(mrb_state *mrb, const char *name, mrb_value val);
 
@@ -1382,7 +1383,7 @@ MRB_API mrb_value mrb_fiber_alive_p(mrb_state *mrb, mrb_value fib);
  *
  * Implemented in mruby-fiber
  */
-#define E_FIBER_ERROR (mrb_exc_get(mrb, "FiberError"))
+#define E_FIBER_ERROR (mrb_exc_get_id(mrb, MRB_SYM(FiberError)))
 MRB_API void mrb_stack_extend(mrb_state*, mrb_int);
 
 /* memory pool implementation */

src/class.c

@@ -229,6 +229,15 @@ mrb_vm_define_module(mrb_state *mrb, mrb_value outer, mrb_sym id)
   return define_module(mrb, id, mrb_class_ptr(outer));
 }
 
+MRB_API struct RClass*
+mrb_define_module_under_id(mrb_state *mrb, struct RClass *outer, mrb_sym name)
+{
+  struct RClass * c = define_module(mrb, name, outer);
+
+  setup_class(mrb, outer, c, name);
+  return c;
+}
+
 MRB_API struct RClass*
 mrb_define_module_under(mrb_state *mrb, struct RClass *outer, const char *name)
 {
@@ -356,6 +365,12 @@ mrb_class_defined(mrb_state *mrb, const char *name)
   return mrb_const_defined(mrb, mrb_obj_value(mrb->object_class), mrb_symbol(sym));
 }
 
+MRB_API mrb_bool
+mrb_class_defined_id(mrb_state *mrb, mrb_sym name)
+{
+  return mrb_const_defined(mrb, mrb_obj_value(mrb->object_class), name);
+}
+
 MRB_API mrb_bool
 mrb_class_defined_under(mrb_state *mrb, struct RClass *outer, const char *name)
 {
@@ -366,12 +381,24 @@ mrb_class_defined_under(mrb_state *mrb, struct RClass *outer, const char *name)
   return mrb_const_defined_at(mrb, mrb_obj_value(outer), mrb_symbol(sym));
 }
 
+MRB_API mrb_bool
+mrb_class_defined_under_id(mrb_state *mrb, struct RClass *outer, mrb_sym name)
+{
+  return mrb_const_defined_at(mrb, mrb_obj_value(outer), name);
+}
+
 MRB_API struct RClass*
 mrb_class_get_under(mrb_state *mrb, struct RClass *outer, const char *name)
 {
   return class_from_sym(mrb, outer, mrb_intern_cstr(mrb, name));
 }
 
+MRB_API struct RClass*
+mrb_class_get_under_id(mrb_state *mrb, struct RClass *outer, mrb_sym name)
+{
+  return class_from_sym(mrb, outer, name);
+}
+
 MRB_API struct RClass*
 mrb_class_get(mrb_state *mrb, const char *name)
 {
@@ -379,11 +406,16 @@ mrb_class_get(mrb_state *mrb, const char *name)
 }
 
 MRB_API struct RClass*
-mrb_exc_get(mrb_state *mrb, const char *name)
+mrb_class_get_id(mrb_state *mrb, mrb_sym name)
+{
+  return mrb_class_get_under_id(mrb, mrb->object_class, name);
+}
+
+MRB_API struct RClass*
+mrb_exc_get_id(mrb_state *mrb, mrb_sym name)
 {
   struct RClass *exc, *e;
-  mrb_value c = mrb_const_get(mrb, mrb_obj_value(mrb->object_class),
-                              mrb_intern_cstr(mrb, name));
+  mrb_value c = mrb_const_get(mrb, mrb_obj_value(mrb->object_class), name);
 
   if (!mrb_class_p(c)) {
     mrb_raise(mrb, mrb->eException_class, "exception corrupted");
@@ -404,12 +436,24 @@ mrb_module_get_under(mrb_state *mrb, struct RClass *outer, const char *name)
   return module_from_sym(mrb, outer, mrb_intern_cstr(mrb, name));
 }
 
+MRB_API struct RClass*
+mrb_module_get_under_id(mrb_state *mrb, struct RClass *outer, mrb_sym name)
+{
+  return module_from_sym(mrb, outer, name);
+}
+
 MRB_API struct RClass*
 mrb_module_get(mrb_state *mrb, const char *name)
 {
   return mrb_module_get_under(mrb, mrb->object_class, name);
 }
 
+MRB_API struct RClass*
+mrb_module_get_id(mrb_state *mrb, mrb_sym name)
+{
+  return mrb_module_get_under_id(mrb, mrb->object_class, name);
+}
+
 /*!
  * Defines a class under the namespace of \a outer.
  * \param outer  a class which contains the new class.
@@ -427,9 +471,8 @@ mrb_module_get(mrb_state *mrb, const char *name)
  *       \a super, the function just returns the defined class.
  */
 MRB_API struct RClass*
-mrb_define_class_under(mrb_state *mrb, struct RClass *outer, const char *name, struct RClass *super)
+mrb_define_class_under_id(mrb_state *mrb, struct RClass *outer, mrb_sym name, struct RClass *super)
 {
-  mrb_sym id = mrb_intern_cstr(mrb, name);
   struct RClass * c;
 
 #if 0
@@ -437,11 +480,17 @@ mrb_define_class_under(mrb_state *mrb, struct RClass *outer, const char *name, s
     mrb_warn(mrb, "no super class for '%C::%n', Object assumed", outer, id);
   }
 #endif
-  c = define_class(mrb, id, super, outer);
-  setup_class(mrb, outer, c, id);
+  c = define_class(mrb, name, super, outer);
+  setup_class(mrb, outer, c, name);
   return c;
 }
 
+MRB_API struct RClass*
+mrb_define_class_under(mrb_state *mrb, struct RClass *outer, const char *name, struct RClass *super)
+{
+  return mrb_define_class_under_id(mrb, outer, mrb_intern_cstr(mrb, name), super);
+}
+
 MRB_API void
 mrb_define_method_raw(mrb_state *mrb, struct RClass *c, mrb_sym mid, mrb_method_t m)
 {
@@ -1896,6 +1945,12 @@ mrb_define_alias(mrb_state *mrb, struct RClass *klass, const char *name1, const
   mrb_alias_method(mrb, klass, mrb_intern_cstr(mrb, name1), mrb_intern_cstr(mrb, name2));
 }
 
+MRB_API void
+mrb_define_alias_id(mrb_state *mrb, struct RClass *klass, mrb_sym a, mrb_sym b)
+{
+  mrb_alias_method(mrb, klass, a, b);
+}
+
 /*
  * call-seq:
  *   mod.to_s   -> string