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compile.c: fix unconditional branch optimization

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* compile.c (iseq_peephole_optimize): add dummy `putnil` after a
  `jump` replacing an unconditional branch, to adjust removed
  `dup`.  [ruby-core:86666] [Bug #14708]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63255 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2018-04-25 06:45:05 +00:00
parent b768dc2207
commit 067066fc9b
2 changed files with 11 additions and 0 deletions
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4
compile.c
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@ -2893,6 +2893,10 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
ELEM_INSERT_NEXT(&iobj->link, &pobj->link);
}
if (cond) {
if (prev_dup) {
pobj = new_insn_core(iseq, pobj->insn_info.line_no, BIN(putnil), 0, NULL);
ELEM_INSERT_NEXT(&iobj->link, &pobj->link);
}
iobj->insn_id = BIN(jump);
goto again;
}

7
test/ruby/test_optimization.rb
View file

@ -764,4 +764,11 @@ class TestRubyOptimization < Test::Unit::TestCase
assert_equal(42, obj.foo {result = 42})
assert_equal(42, result)
end
def test_unconditional_branch_to_leave_block
assert_valid_syntax("#{<<~"begin;"}\n#{<<~'end;'}")
begin;
tap {true || tap {}}
end;
end
end