[Feature #18239] Implement VWA for strings

This commit adds support for embedded strings with variable capacity and
uses Variable Width Allocation to allocate strings.

1 files changed, 10 insertions, 0 deletions

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