From a5b6598192c30187b19b892af3110a46f6a70d76 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Thu, 26 Aug 2021 10:06:32 -0400
Subject: [Feature #18239] Implement VWA for strings

This commit adds support for embedded strings with variable capacity and
uses Variable Width Allocation to allocate strings.
---
 gc.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'gc.rb')

diff --git a/gc.rb b/gc.rb
index c0459b0beb..e80d6635a7 100644
--- a/gc.rb
+++ b/gc.rb
@@ -256,6 +256,16 @@ module GC
   def self.verify_compaction_references(toward: nil, double_heap: false)
     Primitive.gc_verify_compaction_references(double_heap, toward == :empty)
   end
+
+  # :nodoc:
+  # call-seq:
+  #     GC.using_rvargc? -> true or false
+  #
+  # Returns true if using experimental feature Variable Width Allocation, false
+  # otherwise.
+  def self.using_rvargc?
+    GC::INTERNAL_CONSTANTS[:SIZE_POOL_COUNT] > 1
+  end
 end
 
 module ObjectSpace
-- 
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