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compile.c: fix stack consistency error

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* compile.c (iseq_peephole_optimize): fix stack consistency error
  from return in loop, by adding extra `pop` when replacing `jump`
  with `leave`, which is never reached but needed to adjust sp
  calculation.  [ruby-core:84589] [Bug #14273]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61618 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2018-01-05 14:23:23 +00:00
parent 665839ddda
commit 43c1eb440a
2 changed files with 14 additions and 0 deletions
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5
compile.c
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@ -2476,6 +2476,7 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
goto again;
}
else if (IS_INSN_ID(diobj, leave)) {
INSN *pop;
/*
* jump LABEL
* ...
@ -2483,6 +2484,7 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
* leave
* =>
* leave
* pop
* ...
* LABEL:
* leave
@ -2492,6 +2494,9 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
iobj->insn_id = BIN(leave);
iobj->operand_size = 0;
iobj->insn_info = diobj->insn_info;
/* adjust stack depth */
pop = new_insn_body(iseq, diobj->insn_info.line_no, BIN(pop), 0);
ELEM_INSERT_NEXT(&iobj->link, &pop->link);
goto again;
}
else if ((piobj = (INSN *)get_prev_insn(iobj)) != 0 &&

9
test/ruby/test_syntax.rb
View file

@ -1128,6 +1128,15 @@ eom
assert_equal(:begin, result)
end
def test_return_in_loop
obj = Object.new
def obj.test
x = nil
return until x unless x
end
assert_nil obj.test
end
private
def not_label(x) @result = x; @not_label ||= nil end