cont.c: Optimize fiber_switch callees

Remove some unnecessary VALUE/struct conversions and aggressively inline
functions used during fiber_switch. Either of these changes alone does
not yield significant performance increase, but in combination they
improve performance by ~6%.

Arguably, removal of separate VALUE/rb_fiber_t* variables also makes the
code more readable in a few places.

* vm_core.h: declare rb_fiber_t typedef
  (rb_thread_t): fiber and root_fiber become rb_fiber_t * (from VALUE)
* vm.c (rb_thread_mark): use rb_fiber_mark_self
* cont.c (rb_fiber_t): prev becomes rb_fiber_t * (from VALUE)
  (cont_mark, cont_free): simplify conditions
  (rb_fiber_mark_self): new function
  (fiber_mark): use rb_fiber_mark_self
  (cont_save_thread, cont_restore_thread): inline
  (cont_restore_thread): simplify
  (fiber_setcontext): simplify conditions
  (rb_cont_call): remove dereference
  (fiber_t_alloc): update for rb_fiber_t->prev type change
  (rb_fiber_start): ditto
  (fiber_current): extract from rb_fiber_current
  (return_fiber): move, simplify type checks
  (rb_fiber_current): use fiber_current
  (fiber_store): simplify type checks
  (fiber_switch): ditto, simplify call to fiber_setcontext,
   use fiber_current
  (rb_fiber_transfer): update for type changes
  (rb_fiber_terminate): move, use fiber_switch
  (rb_fiber_resume): update for type changes
  (rb_fiber_reset_root_local_storage): ditto
  (rb_fiber_yield): use rb_fiber_switch instead of rb_fiber_transfer
  (rb_fiber_m_transfer): ditto
  [ruby-core:65518] [Feature #10341]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47964 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 2 deletions

diff --git a/vm_core.h b/vm_core.h
index 3f1ddc80f9..d4db5d9085 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -560,6 +560,8 @@ typedef struct rb_ensure_list {
 
 typedef char rb_thread_id_string_t[sizeof(rb_nativethread_id_t) * 2 + 3];
 
+typedef struct rb_fiber_struct rb_fiber_t;
+
 typedef struct rb_thread_struct {
     struct list_node vmlt_node;
     VALUE self;
@@ -681,8 +683,8 @@ typedef struct rb_thread_struct {
     struct rb_trace_arg_struct *trace_arg; /* trace information */
 
     /* fiber */
-    VALUE fiber;
-    VALUE root_fiber;
+    rb_fiber_t *fiber;
+    rb_fiber_t *root_fiber;
     rb_jmpbuf_t root_jmpbuf;
 
     /* ensure & callcc */