https://git.ruby-lang.org/ruby.git/commit/?id=e18b0b6eba

From e18b0b6ebab74e16774bc6121ffba785564b9fd6 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@h...>
Date: Sat, 19 Jun 2021 14:03:06 -0700
Subject: Implement putspecialobject

---
 test/ruby/test_yjit.rb |  6 +++++-
 yjit_codegen.c         | 18 ++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/test/ruby/test_yjit.rb b/test/ruby/test_yjit.rb
index 95e768ee0c..8160042cb9 100644
--- a/test/ruby/test_yjit.rb
+++ b/test/ruby/test_yjit.rb
@@ -59,6 +59,10 @@ class TestYJIT < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_yjit.rb#L59
     assert_compiles('$foo = 123; $foo', insns: %i[setglobal], result: 123)
   end
 
+  def test_compile_putspecialobject
+    assert_compiles('-> {}', insns: %i[putspecialobject])
+  end
+
   def test_compile_tostring
     assert_no_exits('"i am a string #{true}"')
   end
@@ -201,7 +205,7 @@ class TestYJIT < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_yjit.rb#L205
 
       iseq = RubyVM::InstructionSequence.of(_test_proc)
       IO.open(3).write Marshal.dump({
-        result: result,
+        result: #{result == ANY ? "nil" : "result"},
         stats: stats,
         iseqs: collect_iseqs(iseq),
         disasm: iseq.disasm
diff --git a/yjit_codegen.c b/yjit_codegen.c
index 40feda345f..ca4718380e 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -988,6 +988,23 @@ gen_putself(jitstate_t* jit, ctx_t* ctx) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L988
     return YJIT_KEEP_COMPILING;
 }
 
+static codegen_status_t
+gen_putspecialobject(jitstate_t* jit, ctx_t* ctx)
+{
+    enum vm_special_object_type type = (enum vm_special_object_type)jit_get_arg(jit, 0);
+
+    if (type == VM_SPECIAL_OBJECT_VMCORE) {
+        x86opnd_t stack_top = ctx_stack_push(ctx, TYPE_HEAP);
+        jit_mov_gc_ptr(jit, cb, REG0, rb_mRubyVMFrozenCore);
+        mov(cb, stack_top, REG0);
+        return YJIT_KEEP_COMPILING;
+    } else {
+        // TODO: implement for VM_SPECIAL_OBJECT_CBASE and
+        // VM_SPECIAL_OBJECT_CONST_BASE
+        return YJIT_CANT_COMPILE;
+    }
+}
+
 // Compute the index of a local variable from its slot index
 static uint32_t
 slot_to_local_idx(const rb_iseq_t *iseq, int32_t slot_idx)
@@ -3693,6 +3710,7 @@ yjit_init_codegen(void) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L3710
     yjit_reg_op(BIN(putobject_INT2FIX_0_), gen_putobject_int2fix);
     yjit_reg_op(BIN(putobject_INT2FIX_1_), gen_putobject_int2fix);
     yjit_reg_op(BIN(putself), gen_putself);
+    yjit_reg_op(BIN(putspecialobject), gen_putspecialobject);
     yjit_reg_op(BIN(getlocal), gen_getlocal);
     yjit_reg_op(BIN(getlocal_WC_0), gen_getlocal_wc0);
     yjit_reg_op(BIN(getlocal_WC_1), gen_getlocal_wc1);
-- 
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