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* class.c (rb_prepend_module): make T_ICLASS object shady because

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this T_ICLASS object seems to share method table with other class
  objects. It was causes WB miss.
  TODO: need to know the data structure.
* test/ruby/test_module.rb: add a test for WB miss.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42534 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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ko1 2013-08-12 06:19:15 +00:00
parent 7f0a26e271
commit 9af743fe0e
3 changed files with 26 additions and 0 deletions
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class.c
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@ -826,6 +826,7 @@ rb_prepend_module(VALUE klass, VALUE module)
origin = RCLASS_ORIGIN(klass);
if (origin == klass) {
origin = class_alloc(T_ICLASS, klass);
OBJ_WB_UNPROTECT(origin); /* TODO: conservertive shading. Need more survery. */
RCLASS_SET_SUPER(origin, RCLASS_SUPER(klass));
RCLASS_SET_SUPER(klass, origin);
RCLASS_ORIGIN(klass) = origin;