We're updating the issue view to help you get more done. 

Indirect function calls through Var instances fail to clear locals

Description

If you make a function call indirectly by invoking a Var object (which derefs itself and invokes the result), the invocation parameters remain in the thread's local stack for the duration of the function call, even though they are needed only long enough to be passed into the deref'd function. As a result, passing a lazy seq into a function invoked in its Var form may run out of memory if the seq is forced inside that function. For example:

1 2 3 (defn total [xs] (reduce + 0 xs)) (total (range 1000000000)) ; this works, though takes a while (#'total (range 1000000000)) ; this dies with out of memory error

Solution: Similar to RestFn, wrap each argN in Var inside a Util.ret1(argN, argN = null).

Patch: var-clear-locals-patch-v2.diff

Screened by: Alex Miller

Environment

Probably all, but observed on Ubuntu 12.04, OpenJDK 6

Status

Assignee

Unassigned

Reporter

import

Labels

Approval

Ok

Patch

Code

Fix versions

Affects versions

Release 1.4

Priority

Minor