From 9cc71cb9093caa7ee471def8aa8f0de596e366cf Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@gmail.com>
Date: Sat, 31 Jan 2026 11:02:17 +0100
Subject: Use static memory instead of mimalloc for the VM, main ractor, main
 thread.

Also allocate fibers with ruby_xmalloc.
---
 vm.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

(limited to 'vm.c')

diff --git a/vm.c b/vm.c
index 05d2025a12..264bdfa1f2 100644
--- a/vm.c
+++ b/vm.c
@@ -3392,8 +3392,6 @@ ruby_vm_destruct(rb_vm_t *vm)
 
             st_free_table(vm->static_ext_inits);
 
-            rb_vm_postponed_job_free();
-
             rb_id_table_free(vm->constant_cache);
             set_free_table(vm->unused_block_warning_table);
 
@@ -3433,14 +3431,11 @@ ruby_vm_destruct(rb_vm_t *vm)
                 rb_objspace_free_objects(objspace);
                 rb_free_generic_fields_tbl_();
                 rb_free_default_rand_key();
-
-                ruby_mimfree(th);
             }
             rb_objspace_free(objspace);
         }
         rb_native_mutex_destroy(&vm->workqueue_lock);
         /* after freeing objspace, you *can't* use ruby_xfree() */
-        ruby_mimfree(vm);
         ruby_current_vm_ptr = NULL;
 
         if (rb_free_at_exit) {
@@ -3785,7 +3780,7 @@ thread_mark(void *ptr)
     rb_gc_mark(th->top_wrapper);
     if (th->root_fiber) rb_fiber_mark_self(th->root_fiber);
 
-    RUBY_ASSERT(th->ec == rb_fiberptr_get_ec(th->ec->fiber_ptr));
+    RUBY_ASSERT(th->ec == NULL || th->ec == rb_fiberptr_get_ec(th->ec->fiber_ptr));
     rb_gc_mark(th->last_status);
     rb_gc_mark(th->locking_mutex);
     rb_gc_mark(th->name);
@@ -3822,10 +3817,7 @@ thread_free(void *ptr)
     else {
         // ruby_xfree(th->nt);
         // TODO: MN system collect nt, but without MN system it should be freed here.
-        if (th->main_thread) {
-            ruby_mimfree(th);
-        }
-        else {
+        if (!th->main_thread) {
             ruby_xfree(th);
         }
     }
@@ -4576,12 +4568,15 @@ rb_vm_set_progname(VALUE filename)
 
 extern const struct st_hash_type rb_fstring_hash_type;
 
+static rb_vm_t _vm;
+static rb_thread_t _main_thread = { .main_thread = 1 };
+
 void
 Init_BareVM(void)
 {
     /* VM bootstrap: phase 1 */
-    rb_vm_t *vm = ruby_mimcalloc(1, sizeof(*vm));
-    rb_thread_t *th = ruby_mimcalloc(1, sizeof(*th));
+    rb_vm_t *vm = &_vm;
+    rb_thread_t *th = &_main_thread;
     if (!vm || !th) {
         fputs("[FATAL] failed to allocate memory\n", stderr);
         exit(EXIT_FAILURE);
@@ -4590,7 +4585,6 @@ Init_BareVM(void)
     // setup the VM
     vm_init2(vm);
 
-    rb_vm_postponed_job_queue_init(vm);
     ruby_current_vm_ptr = vm;
     rb_objspace_alloc();
     vm->negative_cme_table = rb_id_table_create(16);
@@ -4600,7 +4594,6 @@ Init_BareVM(void)
     vm->global_hooks.type = hook_list_type_global;
 
     // setup main thread
-    th->main_thread = 1;
     th->nt = ZALLOC(struct rb_native_thread);
     th->vm = vm;
     th->ractor = vm->ractor.main_ractor = rb_ractor_main_alloc();
-- 
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