From 9c6deac2d1ea29002f4af33b9c1c15aa2d4c34b7 Mon Sep 17 00:00:00 2001
From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 27 Nov 2014 01:56:38 +0000
Subject: * vm_core.h: add rb_thread_t::local_storage_recursive_hash   to speed
 up Thread#[:__recursive_key__] access.   [Bug #10511] * thread.c
 (threadptr_local_aref): add fast path for   :__recursive_data__. * thread.c
 (threadptr_recursive_hash, threadptr_recursive_hash_set):   add special
 accessor for recursive hash. * cont.c: store/restore
 local_storage_recursive_hash. * vm.c: init and mark
 local_storage_recursive_hash. * vm_trace.c
 (rb_threadptr_exec_event_hooks_orig): clear and restore  
 local_storage_recursive_hash directly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48596 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 thread.c | 68 ++++++++++++++++++++++++++++++++++++++--------------------------
 1 file changed, 40 insertions(+), 28 deletions(-)

(limited to 'thread.c')

diff --git a/thread.c b/thread.c
index a8cc250239..97c4ab903b 100644
--- a/thread.c
+++ b/thread.c
@@ -2753,15 +2753,25 @@ rb_thread_inspect(VALUE thread)
     return rb_thread_inspect_msg(thread, 1, 1, 1);
 }
 
+/* variables for recursive traversals */
+static ID recursive_key;
+
 static VALUE
 threadptr_local_aref(rb_thread_t *th, ID id)
 {
-    st_data_t val;
+    if (id == recursive_key) {
+	return th->local_storage_recursive_hash;
+    }
+    else {
+	st_data_t val;
 
-    if (th->local_storage && st_lookup(th->local_storage, id, &val)) {
-	return (VALUE)val;
+	if (th->local_storage && st_lookup(th->local_storage, id, &val)) {
+	    return (VALUE)val;
+	}
+	else {
+	    return Qnil;
+	}
     }
-    return Qnil;
 }
 
 VALUE
@@ -2843,16 +2853,22 @@ rb_thread_aref(VALUE thread, VALUE key)
 static VALUE
 threadptr_local_aset(rb_thread_t *th, ID id, VALUE val)
 {
-    if (NIL_P(val)) {
+    if (id == recursive_key) {
+	th->local_storage_recursive_hash = val;
+	return val;
+    }
+    else if (NIL_P(val)) {
 	if (!th->local_storage) return Qnil;
 	st_delete_wrap(th->local_storage, id);
 	return Qnil;
     }
-    if (!th->local_storage) {
-	th->local_storage = st_init_numtable();
+    else {
+	if (!th->local_storage) {
+	    th->local_storage = st_init_numtable();
+	}
+	st_insert(th->local_storage, id, val);
+	return val;
     }
-    st_insert(th->local_storage, id, val);
-    return val;
 }
 
 VALUE
@@ -4659,9 +4675,6 @@ rb_thread_shield_destroy(VALUE self)
     return rb_thread_shield_waiting(self) > 0 ? Qtrue : Qfalse;
 }
 
-/* variables for recursive traversals */
-static ID recursive_key;
-
 static VALUE
 ident_hash_new(void)
 {
@@ -4670,6 +4683,18 @@ ident_hash_new(void)
     return hash;
 }
 
+static VALUE
+threadptr_recursive_hash(rb_thread_t *th)
+{
+    return th->local_storage_recursive_hash;
+}
+
+static void
+threadptr_recursive_hash_set(rb_thread_t *th, VALUE hash)
+{
+    th->local_storage_recursive_hash = hash;
+}
+
 /*
  * Returns the current "recursive list" used to detect recursion.
  * This list is a hash table, unique for the current thread and for
@@ -4679,12 +4704,13 @@ ident_hash_new(void)
 static VALUE
 recursive_list_access(void)
 {
-    volatile VALUE hash = rb_thread_local_aref(rb_thread_current(), recursive_key);
+    rb_thread_t *th = GET_THREAD();
+    VALUE hash = threadptr_recursive_hash(th);
     VALUE sym = ID2SYM(rb_frame_this_func());
     VALUE list;
     if (NIL_P(hash) || !RB_TYPE_P(hash, T_HASH)) {
 	hash = ident_hash_new();
-	rb_thread_local_aset(rb_thread_current(), recursive_key, hash);
+	threadptr_recursive_hash_set(th, hash);
 	list = Qnil;
     }
     else {
@@ -4697,20 +4723,6 @@ recursive_list_access(void)
     return list;
 }
 
-VALUE
-rb_threadptr_reset_recursive_data(rb_thread_t *th)
-{
-    VALUE old = threadptr_local_aref(th, recursive_key);
-    threadptr_local_aset(th, recursive_key, Qnil);
-    return old;
-}
-
-void
-rb_threadptr_restore_recursive_data(rb_thread_t *th, VALUE old)
-{
-    threadptr_local_aset(th, recursive_key, old);
-}
-
 /*
  * Returns Qtrue iff obj_id (or the pair <obj, paired_obj>) is already
  * in the recursion list.
-- 
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