Commits on Apr 23, 2024

1. Don't mrb_realloc_simple() call mrb_full_gc() in the sweep phase …

   `mrb_env_unshare()` calls `mrb_realloc_simple()` and follows `mrb_full_gc()` to avoid an infinite loop where `mrb_env_unshare()` is called again.
   This does not occur at this time, but may occur in subsequent patches.

   

   dearblue committed Apr 23, 2024
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2. Allow recycling fibers by GC if not referenced directly …

   The patch assumes that `struct REnv::cxt` only performs checks with the `OP_BREAK` and `OP_RETURN_BLK` instructions, and does not reference the entity.
   Therefore, by changing to a weak reference, it is possible to collect fibers that are no longer directly referenced while in the suspended state.
   
   However, we need to detach the living env objects that remain in the call stack of the fiber.
   So, in effect, it involves a revert of following commits.
     - commit a3365d8
     - commit 57ffa1c
   
   Examples of the effects of change are shown below.
   Note that it was built with `rake MRUBY_CONFIG=host-debug`.
   
   ```ruby
   f = Fiber.new { (x, y, z) = "X", "Y", "Z"; Fiber.yield -> { [x, y, z] } }
   g = f.resume
   GC.start
   p ObjectSpace.memsize_of_all
   # => 59532
   g.call
   # => ["X", "Y", "Z"]
   f = nil
   GC.start
   ObjectSpace.memsize_of_all
   # BEFORE => 59532
   # AFTER  => 58044
   g.call
   # => ["X", "Y", "Z"]
   ```

   

   dearblue committed Apr 23, 2024
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