CompCertTSO: a verified compiler for relaxed-memory concurrency. In this article, we consider the semantic design and verified compilation of a C-like programming language for concurrent shared-memory computation on x86 multiprocessors. The design of such a language is made surprisingly subtle by several factors: the relaxed-memory behavior of the hardware, the effects of compiler optimization on concurrent code, the need to support high-performance concurrent algorithms, and the desire for a reasonably simple programming model. In turn, this complexity makes verified compilation both essential and challenging.We describe ClightTSO, a concurrent extension of CompCert’s Clight in which the TSO-based memory model of x86 multiprocessors is exposed for high-performance code, and CompCertTSO, a formally verified compiler from ClightTSO to x86 assembly language, building on CompCert. CompCertTSO is verified in Coq: for any well-behaved and successfully compiled ClightTSO source program, any permitted observable behavior of the generated assembly code (if it does not run out of memory) is also possible in the source semantics. We also describe some verified fence-elimination optimizations, integrated into CompCertTSO.

References in zbMATH (referenced in 12 articles , 1 standard article )

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  1. Besson, Frédéric; Blazy, Sandrine; Wilke, Pierre: \textscCompCertS: a memory-aware verified C compiler using a pointer as integer semantics (2019)
  2. Kiam Tan, Yong; Myreen, Magnus O.; Kumar, Ramana; Fox, Anthony; Owens, Scott; Norrish, Michael: The verified CakeML compiler backend (2019)
  3. Zakowski, Yannick; Cachera, David; Demange, Delphine; Petri, Gustavo; Pichardie, David; Jagannathan, Suresh; Vitek, Jan: Verifying a concurrent garbage collector with a Rely-Guarantee methodology (2019)
  4. Lochbihler, Andreas: Mechanising a type-safe model of multithreaded Java with a verified compiler (2018)
  5. Besson, Frédéric; Blazy, Sandrine; Wilke, Pierre: Compcerts: a memory-aware verified C compiler using pointer as integer semantics (2017)
  6. Pous, Damien; Rot, Jurriaan: Companions, codensity and causality (2017)
  7. Krebbers, Robbert: A formal C memory model for separation logic (2016)
  8. Pous, Damien: Coinduction all the way up (2016)
  9. Vafeiadis, Viktor; Balabonski, Thibaut; Chakraborty, Soham; Morisset, Robin; Zappa Nardelli, Francesco: Common compiler optimisations are invalid in the C11 memory model and what we can do about it (2015)
  10. Ziliani, Beta; Dreyer, Derek; Krishnaswami, Neelakantan R.; Nanevski, Aleksandar; Vafeiadis, Viktor: Mtac: a monad for typed tactic programming in Coq (2015)
  11. Krebbers, Robbert: An operational and axiomatic semantics for non-determinism and sequence points in C (2014)
  12. Ševčík, Jaroslav; Vafeiadis, Viktor; Zappa Nardelli, Francesco; Jagannathan, Suresh; Sewell, Peter: CompCertTSO: a verified compiler for relaxed-memory concurrency (2013)