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Ensure the shortcut cached in the class

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As well as the other places using RCLASS_IV_INDEX_TBL.
`IO#reopen` seems the only case that the class of an object can be
changed.
This commit is contained in:
Nobuyoshi Nakada 2020-08-17 22:57:40 +09:00
parent 27f7b047e0
commit b52a501ca7
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GPG key ID: 7CD2805BFA3770C6
2 changed files with 13 additions and 2 deletions

11
test/ruby/test_io.rb
View file

@ -2489,6 +2489,17 @@ class TestIO < Test::Unit::TestCase
end
end
def test_reopen_ivar
assert_ruby_status([], "#{<<~"begin;"}\n#{<<~'end;'}")
begin;
f = File.open(IO::NULL)
f.instance_variable_set(:@foo, 42)
f.reopen(STDIN)
f.instance_variable_defined?(:@foo)
f.instance_variable_get(:@foo)
end;
end
def test_foreach
a = []
IO.foreach("|" + EnvUtil.rubybin + " -e 'puts :foo; puts :bar; puts :baz'") {|x| a << x }

4
variable.c
View file

@ -885,7 +885,7 @@ generic_ivar_delete(VALUE obj, ID id, VALUE undef)
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
st_data_t index;
if (st_lookup(iv_index_tbl, (st_data_t)id, &index)) {
if (iv_index_tbl && st_lookup(iv_index_tbl, (st_data_t)id, &index)) {
if (index < ivtbl->numiv) {
VALUE ret = ivtbl->ivptr[index];
@ -906,7 +906,7 @@ generic_ivar_get(VALUE obj, ID id, VALUE undef)
st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));
st_data_t index;
if (st_lookup(iv_index_tbl, (st_data_t)id, &index)) {
if (iv_index_tbl && st_lookup(iv_index_tbl, (st_data_t)id, &index)) {
if (index < ivtbl->numiv) {
VALUE ret = ivtbl->ivptr[index];