Cyclone is a type-safe programming language intended for applications requiring control over memory management. Our previous work on Cyclone included support for stack allocation, lexical region allocation, and a garbagecollected heap. We achieved safety (i.e., prevented dangling pointers) through a region-based type-and-effects system. This paper describes some new memorymanagement mechanisms that we have integrated into Cyclone: dynamic regions, unique pointers, and referencecounted objects. Our experience shows that these new mechanisms are well suited for the timely recovery of objects in situations where it is awkward to use lexical regions. Crucially, programmers can write reusable functions without unnecessarily restricting callers’ choices among the variety of memory-management options. To achieve this goal, Cyclone employs a combination of polymorphism and scoped constructs that temporarily let us treat objects as if they were allocated in a lexical region.
pdf