merge revision(s) 57968,57969,57970: [Backport #13313]

	thread.c: thread_do_start

	* thread.c (thread_do_start): extract from a macro in
	  thread_start_func_2 for debugger.
	thread.c: Thread.start with Symbol

	* thread.c (thread_do_start): fix segfault at start with Symbol.
	  proc created by Symbol#to_proc does not have environment unless
	  using refinements.  [ruby-core:80147] [Bug #13313]
	Fiber also has same issue. [Bug #13313]

	* thread.c (rb_vm_proc_local_ep): added.

	* cont.c (rb_fiber_start): use rb_vm_proc_local_ep().


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@58003 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/vm_core.h b/vm_core.h
index ff5ff90a56..d0385d219f 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1166,6 +1166,8 @@ VM_STACK_ENV_WRITE(const VALUE *ep, int index, VALUE v)
 }
 
 const VALUE *rb_vm_ep_local_ep(const VALUE *ep);
+const VALUE *rb_vm_proc_local_ep(VALUE proc);
+
 VALUE rb_vm_frame_block_handler(const rb_control_frame_t *cfp);
 
 #define RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp) ((cfp)+1)