We formally prove that closure conversion with flat environments for CPS lambda calculus is correct (preserves semantics) and safe for time and space, meaning that produced code preserves the time and space required for the execution of the source program.
We give a cost model to pre- and post-closure-conversion code by formalizing profiling semantics that keep track of the time and space resources needed for the execution of a program, taking garbage collection into account. To show preservation of time and space we set up a general, "garbage-collection compatible'', binary logical relation that establishes invariants on resource consumption of the related programs, along with functional correctness. Using this framework, we show semantics preservation and space and time safety for terminating source programs, and divergence preservation and space safety for diverging source programs.
This is the first formal proof of space-safety of a closure-conversion transformation. The transformation and the proof are parts of a compiler pipeline. Our results are mechanized in the Coq proof assistant.
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|Narcissus: Correct-By-Construction Derivation of Decoders and Encoders from Binary Formats|
Benjamin Delaware Purdue University, Sorawit Suriyakarn , Clément Pit-Claudel MIT CSAIL, Qianchuan Ye Purdue University, Adam Chlipala Massachusetts Institute of TechnologyLink to publication DOI Authorizer link
|Closure Conversion is Safe for Space|
|Linear capabilities for fully abstract compilation of separation-logic-verified code|
|The Next 700 Compiler Correctness Theorems. A Functional Pearl.|