Software and Computational Systems Lab

Publications about BAM

1. Dirk Beyer and Karlheinz Friedberger. In-Place vs. Copy-on-Write CEGAR Refinement for Block Summarization with Caching. In T. Margaria and B. Steffen, editors, Proceedings of the 8th International Symposium on Leveraging Applications of Formal Methods, Verification, and Validation (ISoLA 2018, Part 2, Limassol, Cyprus, November 5-9), LNCS 11245, pages 197-215, 2018. Springer. doi:10.1007/978-3-030-03421-4_14 Keyword(s): CPAchecker, Software Model Checking, BAM Publisher's Version PDF Presentation Supplement
   Abstract

   Block summarization is an efficient technique in software verification to decompose a verification problem into separate tasks and to avoid repeated exploration of reusable parts of a program. In order to benefit from abstraction at the same time, block summarization can be combined with counterexample-guided abstraction refinement (CEGAR). This causes the following problem: whenever CEGAR instructs the model checker to refine the abstraction along a path, several block summaries are affected and need to be updated. There exist two different refinement strategies: a destructive in-place approach that modifies the existing block abstractions and a constructive copy-on-write approach that does not change existing data. While the in-place approach is used in the field for several years, our new approach of copy-on-write refinement has the following important advantage: A complete exportable proof of the program is available after the analysis has finished. Due to the benefit from avoiding recomputations of missing information as necessary for in-place updates, the new approach causes almost no computational overhead overall. We perform a large experimental evaluation to compare the new approach with the previous one to show that full proofs can be achieved without overhead.
   BibTeX Entry

   @inproceedings{ISoLA18b, author = {Dirk Beyer and Karlheinz Friedberger}, title = {In-Place vs. Copy-on-Write CEGAR Refinement for Block Summarization with Caching}, booktitle = {Proceedings of the 8th International Symposium on Leveraging Applications of Formal Methods, Verification, and Validation (ISoLA~2018, Part~2, Limassol, Cyprus, November 5-9)}, editor = {T.~Margaria and B.~Steffen}, pages = {197-215}, year = {2018}, series = {LNCS~11245}, publisher = {Springer}, doi = {10.1007/978-3-030-03421-4_14}, sha256 = {}, url = {https://www.sosy-lab.org/research/bam-cow-refinement/}, pdf = {https://www.sosy-lab.org/research/pub/2018-ISoLA.In-Place_vs_Copy-on-Write_CEGAR_Refinement_for_Block_Summarization_with_Caching.pdf}, presentation = {https://www.sosy-lab.org/research/prs/2018-11-06_ISoLA18_BAM-CoW-Refinement_Dirk.pdf}, abstract = {Block summarization is an efficient technique in software verification to decompose a verification problem into separate tasks and to avoid repeated exploration of reusable parts of a program. In order to benefit from abstraction at the same time, block summarization can be combined with counterexample-guided abstraction refinement (CEGAR). This causes the following problem: whenever CEGAR instructs the model checker to refine the abstraction along a path, several block summaries are affected and need to be updated. There exist two different refinement strategies: a destructive in-place approach that modifies the existing block abstractions and a constructive copy-on-write approach that does not change existing data. While the in-place approach is used in the field for several years, our new approach of copy-on-write refinement has the following important advantage: A complete exportable proof of the program is available after the analysis has finished. Due to the benefit from avoiding recomputations of missing information as necessary for in-place updates, the new approach causes almost no computational overhead overall. We perform a large experimental evaluation to compare the new approach with the previous one to show that full proofs can be achieved without overhead.}, keyword = {CPAchecker,Software Model Checking,BAM}, }
2. Dirk Beyer and Karlheinz Friedberger. Domain-Independent Multi-threaded Software Model Checking. In Marianne Huchard, Christian Kästner, and Gordon Fraser, editors, Proceedings of the 33rd ACM/IEEE International Conference on Automated Software Engineering, ASE 2018, Montpellier, France, September 3-7, 2018, pages 634-644, 2018. ACM. doi:10.1145/3238147.3238195 Keyword(s): CPAchecker, Software Model Checking, BAM Publisher's Version PDF Presentation Supplement
   Abstract

   Recent development of software aims at massively parallel execution, because of the trend to increase the number of processing units per CPU socket. But many approaches for program analysis are not designed to benefit from a multi-threaded execution and lack support to utilize multi-core computers. Rewriting existing algorithms is difficult and error-prone, and the design of new parallel algorithms also has limitations. An orthogonal problem is the granularity: computing each successor state in parallel seems too fine-grained, so the open question is to find the right structural level for parallel execution. We propose an elegant solution to these problems: Block summaries should be computed in parallel. Many successful approaches to software verification are based on summaries of control-flow blocks, large blocks, or function bodies. Block-abstraction memoization is a successful domain-independent approach for summary-based program analysis. We redesigned the verification approach of block-abstraction memoization starting from its original recursive definition, such that it can run in a parallel manner for utilizing the available computation resources without losing its advantages of being independent from a certain abstract domain. We present an implementation of our new approach for multi-core shared-memory machines. The experimental evaluation shows that our summary-based approach has no significant overhead compared to the existing sequential approach and that it has a significant speedup when using multi-threading.
   BibTeX Entry

   @inproceedings{ASE18a, author = {Dirk Beyer and Karlheinz Friedberger}, title = {Domain-Independent Multi-threaded Software Model Checking}, booktitle = {Proceedings of the 33rd {ACM/IEEE} International Conference on Automated Software Engineering, {ASE} 2018, Montpellier, France, September 3-7, 2018}, editor = {Marianne Huchard and Christian K{\"{a}}stner and Gordon Fraser}, pages = {634-644}, year = {2018}, publisher = {ACM}, doi = {10.1145/3238147.3238195}, sha256 = {}, url = {https://www.sosy-lab.org/research/bam-parallel/}, pdf = {https://www.sosy-lab.org/research/pub/2018-ASE.Domain-Independent_Multi-threaded_Software_Model_Checking.pdf}, presentation = {https://www.sosy-lab.org/research/prs/2018-09-07_ASE18_ParallelBAM_Karlheinz.pdf}, abstract = {Recent development of software aims at massively parallel execution, because of the trend to increase the number of processing units per CPU socket. But many approaches for program analysis are not designed to benefit from a multi-threaded execution and lack support to utilize multi-core computers. Rewriting existing algorithms is difficult and error-prone, and the design of new parallel algorithms also has limitations. An orthogonal problem is the granularity: computing each successor state in parallel seems too fine-grained, so the open question is to find the right structural level for parallel execution. We propose an elegant solution to these problems: Block summaries should be computed in parallel. Many successful approaches to software verification are based on summaries of control-flow blocks, large blocks, or function bodies. Block-abstraction memoization is a successful domain-independent approach for summary-based program analysis. We redesigned the verification approach of block-abstraction memoization starting from its original recursive definition, such that it can run in a parallel manner for utilizing the available computation resources without losing its advantages of being independent from a certain abstract domain. We present an implementation of our new approach for multi-core shared-memory machines. The experimental evaluation shows that our summary-based approach has no significant overhead compared to the existing sequential approach and that it has a significant speedup when using multi-threading.}, keyword = {CPAchecker,Software Model Checking,BAM}, }

1. Alexander Ried. Design and Implementation of a Cluster-Based Approach for Software Verification. Bachelor's Thesis, LMU Munich, Software Systems Lab, 2020. Keyword(s): CPAchecker, BAM
   BibTeX Entry

   @misc{RiedClusterBAM, author = {Alexander Ried}, title = {Design and Implementation of a Cluster-Based Approach for Software Verification}, year = {2020}, keyword = {CPAchecker, BAM}, field = {Computer Science}, howpublished = {Bachelor's Thesis, LMU Munich, Software Systems Lab}, }