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c++: fix double free when a symbol_type was moved

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Currently the following piece of code crashes (with parse.assert),
because we don't record that s was moved-from, and we invoke its dtor.

    {
      auto s = parser::make_INT (42);
      auto s2 = std::move (s);
    }

Reported by Wolfgang Thaller.
http://lists.gnu.org/archive/html/bug-bison/2018-12/msg00077.html

* data/c++.m4 (by_type): Provide a move-ctor.
(basic_symbol): Be sure not to read a moved-from value.
* tests/c++.at (C++ Variant-based Symbols Unit Tests): Check this case.
This commit is contained in:
Akim Demaille
2018-12-23 19:37:30 +01:00
parent 45cd7dfb7f
commit 807bf60cfc
3 changed files with 23 additions and 3 deletions
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11
tests/c++.at
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@@ -160,6 +160,17 @@ int main()
assert_eq (s.value.as<int> (), 12);
}
// symbol_type: move constructor.
#if 201103L <= YY_CPLUSPLUS
{
auto s = parser::make_INT (42);
auto s2 = std::move (s);
assert_eq (s2.value.as<int> (), 42);
// Used to crash here, because s was improperly cleared, and
// its destructor tried to delete its (moved) value.
}
#endif
// stack_symbol_type: construction, accessor.
{
#if 201103L <= YY_CPLUSPLUS