[C++] Control Flow Influence not detected interprocedurally

[JustusAdam]

The controls predicate from GuardCondition does not detect influence across function boundaries. Is this intended behavior?

Here is the code for my example. Influence from condition in line 23 is detected but not from line 14.

Similarly the influence on call() in line 30 is detected but not on line 8.

#include <exception>

void call()
{
}

void call_wrapper()
{
    call(); // not detected as controlled
}

void check_condition(bool condition)
{
    if (condition) // not detected as controlling
    {
        throw std::exception();
    }
}

void my_fn(bool outer, bool condition)
{

    if (condition) // detected as controlling
    {
        throw std::exception();
    }

    check_condition(condition);

    call(); // detected as controlled

    call_wrapper();
}

import cpp
import semmle.code.cpp.controlflow.IRGuards

from Variable v, VariableAccess va, GuardCondition cond, Call c, int line
where
  c.getTarget().getName() = "call" and
  va.getTarget() = v and
  v.getName() = "condition" and
  cond.getAChild*() = va and
  cond.controls(c.getBasicBlock(), _) and
  line = va.getLocation().getStartLine()
select v, va, cond, c, line

|     v     |    va     |   cond    |      c       | line |
+-----------+-----------+-----------+--------------+------+
| condition | condition | condition | call to call |   23 |

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