A Tail-Recursive Semantics for Stack Inspections
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- Clements J., Felleisen M. (2003) A Tail-Recursive Semantics for Stack Inspections. In: Degano P. (eds) Programming Languages and Systems. ESOP 2003. Lecture Notes in Computer Science, vol 2618. Springer, Berlin, Heidelberg
Security folklore holds that a security mechanism based on stack inspection is incompatible with a global tail call optimization policy. An implementation of such a language may have to allocate memory for a source-code tail call, and a program that uses only tail calls (and no other memory-allocating construct) may nevertheless exhaust the available memory. In this paper, we prove this widely held belief wrong. We exhibit an abstract machine for a language with security stack inspection whose space consumption function is equivalent to that of the canonical tail call optimizing abstract machine. Our machine is surprisingly simple and suggests that tail-calls are as easy to implement in a security setting as they are in a conventional one.