https://git.ruby-lang.org/ruby.git/commit/?id=c215a6f282

From c215a6f2822d2d0c09e90867baadb250fd31206c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 13 Aug 2019 11:03:54 +0900
Subject: Removed non-VM_OBJSPACE code

It has not been used for 4 years, since r60856,
e33b1690d06f867e45750bd8e3e8b06d78b5bc26.

diff --git a/gc.c b/gc.c
index 812cd19..158a57d 100644
--- a/gc.c
+++ b/gc.c
@@ -730,18 +730,9 @@ struct heap_page { https://github.com/ruby/ruby/blob/trunk/gc.c#L730
 #define GET_HEAP_MARKING_BITS(x)        (&GET_HEAP_PAGE(x)->marking_bits[0])
 #endif
 
-#ifndef ENABLE_VM_OBJSPACE
-# define ENABLE_VM_OBJSPACE 1
-#endif
-
 /* Aliases */
-#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
 #define rb_objspace (*rb_objspace_of(GET_VM()))
 #define rb_objspace_of(vm) ((vm)->objspace)
-#else
-static rb_objspace_t rb_objspace = {{GC_MALLOC_LIMIT_MIN}};
-#define rb_objspace_of(vm) (&rb_objspace)
-#endif
 
 #define ruby_initial_gc_stress	gc_params.gc_stress
 
@@ -1422,11 +1413,7 @@ RVALUE_WHITE_P(VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L1413
 rb_objspace_t *
 rb_objspace_alloc(void)
 {
-#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
     rb_objspace_t *objspace = calloc(1, sizeof(rb_objspace_t));
-#else
-    rb_objspace_t *objspace = &rb_objspace;
-#endif
     malloc_limit = gc_params.malloc_limit_min;
     list_head_init(&objspace->eden_heap.pages);
     list_head_init(&objspace->tomb_heap.pages);
@@ -1472,9 +1459,6 @@ rb_objspace_free(rb_objspace_t *objspace) https://github.com/ruby/ruby/blob/trunk/gc.c#L1459
     st_free_table(objspace->id_to_obj_tbl);
     st_free_table(objspace->obj_to_id_tbl);
     free_stack_chunks(&objspace->mark_stack);
-#if !(defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE)
-    if (objspace == &rb_objspace) return;
-#endif
     free(objspace);
 }
 
-- 
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