Henri Biestro created JEXL-274:
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Summary: Handle soft and hard stack overflow
Key: JEXL-274
URL: https://issues.apache.org/jira/browse/JEXL-274
Project: Commons JEXL
Issue Type: Improvement
Affects Versions: 3.1
Reporter: Henri Biestro
Assignee: Henri Biestro
Fix For: 3.2
WHAT:
Since JEXL allows recursion, it would be convenient to stop execution early
when running towards a stack overflow. In general, scripts don't have much use
for recursion so this would be a good (soft) safeguard.
Incidentally, when a function called by a script ends up in a stack overflow,
it would be nice to catch it and properly propagate it through a JexlException.
HOW:
Introduce a new JexlException subclass (StackOverflow) that can be thrown after
catching a (JVM) StackOverflow in Interpreter.interpret().
The StackOverflow soft limit -ie one that pertains to JEXL only - requires a
new JexlBuilder option (stackOverflow(size)) and a way to count the stack
'height'; easiest/safest seems to put interpreter instance in TLS and
increment/check a 'frame pointer' member.
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