https://git.ruby-lang.org/ruby.git/commit/?id=cb1f9fe918

From cb1f9fe9184c67f9a99f6a9702559293613b7e80 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 20 Sep 2019 16:48:42 +0900
Subject: Check various method defitions in C++


diff --git a/ext/-test-/cxxanyargs/cxxanyargs.cpp b/ext/-test-/cxxanyargs/cxxanyargs.cpp
index c0117b3..9a800cb 100644
--- a/ext/-test-/cxxanyargs/cxxanyargs.cpp
+++ b/ext/-test-/cxxanyargs/cxxanyargs.cpp
@@ -337,6 +337,49 @@ namespace test_rb_ivar_foreach { https://github.com/ruby/ruby/blob/trunk/ext/-test-/cxxanyargs/cxxanyargs.cpp#L337
     }
 }
 
+namespace test_rb_define_method {
+    static VALUE
+    m1(VALUE, VALUE)
+    {
+        return Qnil;
+    }
+
+    static VALUE
+    m2(VALUE, VALUE, VALUE)
+    {
+        return Qnil;
+    }
+
+    static VALUE
+    ma(VALUE, VALUE)
+    {
+        return Qnil;
+    }
+
+    static VALUE
+    mv(int, VALUE*, VALUE)
+    {
+        return Qnil;
+    }
+
+    VALUE
+    test(VALUE self)
+    {
+        // No cast
+        rb_define_method(self, "m1", m1, 1);
+        rb_define_method(self, "m2", m2, 2);
+        rb_define_method(self, "ma", ma, -2);
+        rb_define_method(self, "mv", mv, -1);
+
+        // Cast by RUBY_METHOD_FUNC
+        rb_define_method(self, "m1", RUBY_METHOD_FUNC(m1), 1);
+        rb_define_method(self, "m2", RUBY_METHOD_FUNC(m2), 2);
+        rb_define_method(self, "ma", RUBY_METHOD_FUNC(ma), -2);
+        rb_define_method(self, "mv", RUBY_METHOD_FUNC(mv), -1);
+        return self;
+    }
+}
+
 extern "C" void
 Init_cxxanyargs(void)
 {
@@ -361,4 +404,5 @@ Init_cxxanyargs(void) https://github.com/ruby/ruby/blob/trunk/ext/-test-/cxxanyargs/cxxanyargs.cpp#L404
     test(st_foreach_safe);
     test(rb_hash_foreach);
     test(rb_ivar_foreach);
+    test(rb_define_method);
 }
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 1edde16..ad86f28 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -2711,12 +2711,24 @@ RUBY_SYMBOL_EXPORT_END https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L2711
 # define rb_f_notimplement_p(f) 0
 #endif
 
-#if defined(__has_attribute) && (defined(__cplusplus) || defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)) && !defined(_WIN32) && !defined(__CYGWIN__)
-#if (defined(__cplusplus) || __has_attribute(transparent_union)) && __has_attribute(unused) && __has_attribute(weakref) && __has_attribute(nonnull)
+#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)
+#if defined(__has_attribute) && __has_attribute(transparent_union) && __has_attribute(unused) && __has_attribute(weakref) && __has_attribute(nonnull)
+#define RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,vars,funcargs) \
+    __attribute__((__unused__,__weakref__(#def),__nonnull__ nonnull))static void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity);
+#endif
+#endif
+
+#if defined(RB_METHOD_DEFINITION_DECL_C) || defined(__cplusplus)
+#ifndef RB_METHOD_DEFINITION_DECL_C
+#define RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,vars,funcargs) \
+    static inline void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity) \
+    { \
+        def(RB_UNWRAP_MACRO vars,(VALUE(*)(ANYARGS))(func),arity); \
+    }
+#endif
 
 #define RB_UNWRAP_MACRO(...) __VA_ARGS__
-#define RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,funcargs) \
-    __attribute__((__unused__,__weakref__(#def),__nonnull__ nonnull))static void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity);
+
 #ifdef __cplusplus
 #define RB_METHOD_DEFINITION_DECL_CXX_BEGIN(def) template <int Arity> struct def##_tmpl {};
 #define RB_METHOD_DEFINITION_DECL_CXX(def,defname,decl,vars,funcargs,arity) \
@@ -2728,7 +2740,7 @@ RUBY_SYMBOL_EXPORT_END https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L2740
 #define RB_METHOD_DEFINITION_DECL_CXX(def,defname,decl,vars,funcargs,arity) /* nothing */
 #endif
 #define RB_METHOD_DEFINITION_DECL_1(def,nonnull,defname,arity,decl,vars,funcargs) \
-    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,funcargs) \
+    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,vars,funcargs) \
     RB_METHOD_DEFINITION_DECL_CXX(def,defname,decl,vars,funcargs,arity)
 
 #define RB_METHOD_DEFINITION_DECL(def,nonnull,decl,vars) \
@@ -2754,16 +2766,20 @@ RB_METHOD_DEFINITION_DECL_1(def,nonnull,def##m2,-2,decl,vars,(VALUE,VALUE)) \ https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L2766
 RB_METHOD_DEFINITION_DECL_M1(def,nonnull,def##m1,decl,vars) /* END */
 #ifdef __cplusplus
 #define RB_METHOD_DEFINITION_DECL_M1(def,nonnull,defname,decl,vars) \
-    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,(int,VALUE*,VALUE)) \
-    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,(int,const VALUE*,VALUE)) \
-    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,(int,const VALUE*,VALUE,VALUE))
+    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,vars,(int,VALUE*,VALUE)) \
+    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,vars,(int,const VALUE*,VALUE)) \
+    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,vars,(int,const VALUE*,VALUE,VALUE)) \
+    template <> struct def##_tmpl<-1> { \
+        static void define(RB_UNWRAP_MACRO decl, VALUE (*func)(int,VALUE*,VALUE)) {::defname(RB_UNWRAP_MACRO vars, func, -1);} \
+        static void define(RB_UNWRAP_MACRO decl, VALUE (*func)(int,const VALUE*,VALUE)) {::defname(RB_UNWRAP_MACRO vars, func, -1);} \
+        static void define(RB_UNWRAP_MACRO decl, VALUE (*func)(int,const VALUE*,VALUE,VALUE)) {::defname(RB_UNWRAP_MACRO vars, func, -1);} \
+    };
 #else
 #define RB_METHOD_DEFINITION_DECL_M1(def,nonnull,defname,decl,vars) \
-    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,(int,union{VALUE*x;const VALUE*y;}__attribute__((__transparent_union__)),VALUE))
+    RB_METHOD_DEFINITION_DECL_C(def,nonnull,defname,decl,vars,(int,union{VALUE*x;const VALUE*y;}__attribute__((__transparent_union__)),VALUE))
 #endif
 
 #endif
-#endif
 
 #ifdef RB_METHOD_DEFINITION_DECL
 
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