fix stack storing for root fibers.

* cont.c (root_fiber_alloc): this function is called by fiber_current()
  and fiber_store(). fiber_current() should clear VM stack information
  in a fiber data because runnning thread knows stack information and has
  responsibility to manage it. However fiber_store() requires to remain
  VM stack information in a fiber data because the responsibility to manage
  VM stack is moved to the Fiber from the Thread (and switch to another
  fiber).

* cont.c (root_fiber_alloc): save thread's fiber and root_fiber information.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59474 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/vm.c b/vm.c
index 266b251485..bc944e5085 100644
--- a/vm.c
+++ b/vm.c
@@ -90,6 +90,8 @@ VM_CFP_IN_HEAP_P(const rb_thread_t *th, const rb_control_frame_t *cfp)
 {
     const VALUE *start = th->ec.stack;
     const VALUE *end = (VALUE *)th->ec.stack + th->ec.stack_size;
+    VM_ASSERT(start != NULL);
+
     if (start <= (VALUE *)cfp && (VALUE *)cfp < end) {
 	return FALSE;
     }
@@ -103,6 +105,8 @@ VM_EP_IN_HEAP_P(const rb_thread_t *th, const VALUE *ep)
 {
     const VALUE *start = th->ec.stack;
     const VALUE *end = (VALUE *)th->ec.cfp;
+    VM_ASSERT(start != NULL);
+
     if (start <= ep && ep < end) {
 	return FALSE;
     }