Decouple GC slot sizes from RVALUE

Add a new macro BASE_SLOT_SIZE that determines the slot size.

For Variable Width Allocation (compiled with USE_RVARGC=1), all slot
sizes are powers-of-2 multiples of BASE_SLOT_SIZE.

For USE_RVARGC=0, BASE_SLOT_SIZE is set to sizeof(RVALUE).

1 files changed, 5 insertions, 3 deletions

diff --git a/test/-ext-/string/test_set_len.rb b/test/-ext-/string/test_set_len.rb
index 5216e6195f..67ba961194 100644
--- a/test/-ext-/string/test_set_len.rb
+++ b/test/-ext-/string/test_set_len.rb
@@ -4,18 +4,20 @@ require "-test-/string"
 
 class Test_StrSetLen < Test::Unit::TestCase
   def setup
-    @s0 = [*"a".."z"].join("").freeze
+    # Make string long enough so that it is not embedded
+    @range_end = ("0".ord + GC::INTERNAL_CONSTANTS[:BASE_SLOT_SIZE]).chr
+    @s0 = [*"0"..@range_end].join("").freeze
     @s1 = Bug::String.new(@s0)
   end
 
   def teardown
-    orig = [*"a".."z"].join("")
+    orig = [*"0"..@range_end].join("")
     assert_equal(orig, @s0)
   end
 
   def test_non_shared
     @s1.modify!
-    assert_equal("abc", @s1.set_len(3))
+    assert_equal("012", @s1.set_len(3))
   end
 
   def test_shared