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Content Provider | ACM Digital Library |
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Author | Clinger, William D. |
Abstract | The IEEE/ANSI standard for Scheme requires implementations to be properly tail recursive. This ensures that portable code can rely upon the space efficiency of continuation-passing style and other idioms. On its face, proper tail recursion concerns the efficiency of procedure calls that occur within a tail context. When examined closely, proper tail recursion also depends upon the fact that garbage collection can be asymptotically more space-efficient than Algol-like stack allocation.Proper tail recursion is not the same as ad hoc tail call optimization in stack-based languages. Proper tail recursion often precludes stack allocation of variables, but yields a well-defined asymptotic space complexity that can be relied upon by portable programs.This paper offers a formal and implementation-independent definition of proper tail recursion for Scheme. It also shows how an entire family of reference implementations can be used to characterize related safe-for-space properties, and proves the asymptotic inequalities that hold between them. |
Starting Page | 174 |
Ending Page | 185 |
Page Count | 12 |
File Format | |
ISBN | 0897919874 |
DOI | 10.1145/277650.277719 |
Language | English |
Publisher | Association for Computing Machinery (ACM) |
Publisher Date | 1998-05-01 |
Publisher Place | New York |
Access Restriction | Subscribed |
Content Type | Text |
Resource Type | Article |
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