https://git.ruby-lang.org/ruby.git/commit/?id=7341b01465

From 7341b0146557bccd783484b279569b530c888a14 Mon Sep 17 00:00:00 2001
From: Matt Valentine-House <matt@e...>
Date: Tue, 26 Jan 2021 16:29:09 +0000
Subject: Add RCLASS_ALLOCATOR Macro

---
 class.c          | 8 ++++----
 internal/class.h | 1 +
 vm_method.c      | 4 ++--
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/class.c b/class.c
index 22f1208..2a18eab 100644
--- a/class.c
+++ b/class.c
@@ -188,7 +188,7 @@ class_alloc(VALUE flags, VALUE klass) https://github.com/ruby/ruby/blob/trunk/class.c#L188
     RCLASS_SET_ORIGIN((VALUE)obj, (VALUE)obj);
     RCLASS_SERIAL(obj) = rb_next_class_serial();
     RB_OBJ_WRITE(obj, &RCLASS_REFINED_CLASS(obj), Qnil);
-    RCLASS_EXT(obj)->allocator = 0;
+    RCLASS_ALLOCATOR(obj) = 0;
 
     return (VALUE)obj;
 }
@@ -372,7 +372,7 @@ rb_mod_init_copy(VALUE clone, VALUE orig) https://github.com/ruby/ruby/blob/trunk/class.c#L372
         RBASIC_SET_CLASS(clone, rb_singleton_class_clone(orig));
         rb_singleton_class_attached(RBASIC(clone)->klass, (VALUE)clone);
     }
-    RCLASS_EXT(clone)->allocator = RCLASS_EXT(orig)->allocator;
+    RCLASS_ALLOCATOR(clone) = RCLASS_ALLOCATOR(orig);
     copy_tables(clone, orig);
     if (RCLASS_M_TBL(orig)) {
 	struct clone_method_arg arg;
@@ -409,7 +409,7 @@ rb_mod_init_copy(VALUE clone, VALUE orig) https://github.com/ruby/ruby/blob/trunk/class.c#L409
             RCLASS_M_TBL(clone_p) = RCLASS_M_TBL(p);
             RCLASS_CONST_TBL(clone_p) = RCLASS_CONST_TBL(p);
             RCLASS_IV_TBL(clone_p) = RCLASS_IV_TBL(p);
-            RCLASS_EXT(clone_p)->allocator = RCLASS_EXT(p)->allocator;
+            RCLASS_ALLOCATOR(clone_p) = RCLASS_ALLOCATOR(p);
             if (RB_TYPE_P(clone, T_CLASS)) {
                 RCLASS_SET_INCLUDER(clone_p, clone);
             }
@@ -492,7 +492,7 @@ rb_singleton_class_clone_and_attach(VALUE obj, VALUE attach) https://github.com/ruby/ruby/blob/trunk/class.c#L492
 	}
 
 	RCLASS_SET_SUPER(clone, RCLASS_SUPER(klass));
-	RCLASS_EXT(clone)->allocator = RCLASS_EXT(klass)->allocator;
+	RCLASS_ALLOCATOR(clone) = RCLASS_ALLOCATOR(klass);
 	if (RCLASS_IV_TBL(klass)) {
 	    rb_iv_tbl_copy(clone, klass);
 	}
diff --git a/internal/class.h b/internal/class.h
index 1697ae1..b05e264 100644
--- a/internal/class.h
+++ b/internal/class.h
@@ -94,6 +94,7 @@ typedef struct rb_classext_struct rb_classext_t; https://github.com/ruby/ruby/blob/trunk/internal/class.h#L94
 #define RCLASS_INCLUDER(c) (RCLASS_EXT(c)->includer)
 #define RCLASS_PARENT_SUBCLASSES(c) (RCLASS_EXT(c)->parent_subclasses)
 #define RCLASS_MODULE_SUBCLASSES(c) (RCLASS_EXT(c)->module_subclasses)
+#define RCLASS_ALLOCATOR(c) (RCLASS_EXT(c)->allocator)
 
 #define RICLASS_IS_ORIGIN FL_USER5
 #define RCLASS_CLONED     FL_USER6
diff --git a/vm_method.c b/vm_method.c
index 0064488..19852b0 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -941,7 +941,7 @@ void https://github.com/ruby/ruby/blob/trunk/vm_method.c#L941
 rb_define_alloc_func(VALUE klass, VALUE (*func)(VALUE))
 {
     Check_Type(klass, T_CLASS);
-    RCLASS_EXT(klass)->allocator = func;
+    RCLASS_ALLOCATOR(klass) = func;
 }
 
 void
@@ -956,7 +956,7 @@ rb_get_alloc_func(VALUE klass) https://github.com/ruby/ruby/blob/trunk/vm_method.c#L956
     Check_Type(klass, T_CLASS);
 
     for (; klass; klass = RCLASS_SUPER(klass)) {
-	rb_alloc_func_t allocator = RCLASS_EXT(klass)->allocator;
+	rb_alloc_func_t allocator = RCLASS_ALLOCATOR(klass);
 	if (allocator == UNDEF_ALLOC_FUNC) break;
 	if (allocator) return allocator;
     }
-- 
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