constify again.

Same as last commit, make some fields `const`.

include/ruby/ruby.h:
* Rasic::klass
* RArray::heap::aux::shared_root
* RRegexp::src
internal.h:
* rb_classext_struct::origin_, redefined_class
* vm_svar::cref_or_me, lastline, backref, others
* vm_throw_data::throw_obj
* vm_ifunc::data
* MEMO::v1, v2, u3::value

While modifying this patch, I found write-barrier miss on
rb_classext_struct::redefined_class.

Also vm_throw_data::throw_state is only `int` so change the type.

1 files changed, 5 insertions, 5 deletions

diff --git a/eval.c b/eval.c
index 138006e0db..afc78532df 100644
--- a/eval.c
+++ b/eval.c
@@ -1356,7 +1356,7 @@ rb_using_refinement(rb_cref_t *cref, VALUE klass, VALUE module)
     FL_SET(module, RMODULE_IS_OVERLAID);
     superclass = refinement_superclass(superclass);
     c = iclass = rb_include_class_new(module, superclass);
-    RCLASS_REFINED_CLASS(c) = klass;
+    RB_OBJ_WRITE(c, &RCLASS_REFINED_CLASS(c), klass);
 
     RCLASS_M_TBL(OBJ_WB_UNPROTECT(c)) =
       RCLASS_M_TBL(OBJ_WB_UNPROTECT(module)); /* TODO: check unprotecting */
@@ -1365,8 +1365,8 @@ rb_using_refinement(rb_cref_t *cref, VALUE klass, VALUE module)
     while (module && module != klass) {
 	FL_SET(module, RMODULE_IS_OVERLAID);
 	c = RCLASS_SET_SUPER(c, rb_include_class_new(module, RCLASS_SUPER(c)));
-	RCLASS_REFINED_CLASS(c) = klass;
-	module = RCLASS_SUPER(module);
+        RB_OBJ_WRITE(c, &RCLASS_REFINED_CLASS(c), klass);
+        module = RCLASS_SUPER(module);
     }
     rb_hash_aset(CREF_REFINEMENTS(cref), klass, iclass);
 }
@@ -1451,12 +1451,12 @@ add_activated_refinement(VALUE activated_refinements,
     FL_SET(refinement, RMODULE_IS_OVERLAID);
     superclass = refinement_superclass(superclass);
     c = iclass = rb_include_class_new(refinement, superclass);
-    RCLASS_REFINED_CLASS(c) = klass;
+    RB_OBJ_WRITE(c, &RCLASS_REFINED_CLASS(c), klass);
     refinement = RCLASS_SUPER(refinement);
     while (refinement && refinement != klass) {
 	FL_SET(refinement, RMODULE_IS_OVERLAID);
 	c = RCLASS_SET_SUPER(c, rb_include_class_new(refinement, RCLASS_SUPER(c)));
-	RCLASS_REFINED_CLASS(c) = klass;
+        RB_OBJ_WRITE(c, &RCLASS_REFINED_CLASS(c), klass);
 	refinement = RCLASS_SUPER(refinement);
     }
     rb_hash_aset(activated_refinements, klass, iclass);