id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
9260	Phoenix switch_ statements accessing wrong memory and cause segfault	stephan.menzel@…	Thomas Heller	"Seth Heeren and I tracked down a problem in phoenix 3's switch_ statements that causes a crash in the attached example.

Judging from valgrind outputs, it appears as if the switch_ accesses memory outside it's stack. In the attached case that causes a crash when accessing local variables in the enclosing rule.

To reproduce:

With this rule:
qi::rule<It, bool(), qi::locals<bool, unsigned int, double, std::string>,  Skipper> enclosing;

defined as:
enclosing %= condition[_a = _1] >> double_[_val = _a];

it works.

If it is defined as:
enclosing %= condition[_a = _1] >> double_[_c = _1, _val = _a];

it crashes.

When not using local variables there is no crash but still  undefined behavior caused by the switch_.
Phoenix 2 does not have this problem.

"	Bugs	new	To Be Determined	phoenix	Boost 1.54.0	Problem		phoenix  spirit qi