clllvm:经过验证的可靠的LLVM编译

Jeehoon Kang, Yoonseung Kim, Youngju Song, Juneyoung Lee, Sanghoon Park, Mark Dongyeon Shin, Y. Kim, Sungkeun Cho, Joonwon Choi, C. Hur, K. Yi
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引用次数: 27

摘要

生产编译器(如GCC和LLVM)是大型复杂的软件系统,很难实现高水平的可靠性。尽管测试是发现bug的有效方法,但它本身并不能保证高水平的可靠性。为了提供更高级别的可靠性,已经提出了许多检查编译器内部逻辑的方法。然而,它们都没有成功地应用到产品编译器的主要优化中。本文提出了Crellvm:一个经过验证的可靠的LLVM编译框架,它可以作为一种系统的方式,为LLVM中的主要优化提供高水平的可靠性。具体来说,我们增加了一个LLVM优化器来生成翻译结果及其正确性证明,然后可以由Coq中正式验证的证明检查器进行检查。作为案例研究,我们将我们的方法应用于LLVM的两个主要优化:寄存器提升mem2reg和全局值编号gvn,发现了四个新的错误编译错误(每个错误两个)。
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Crellvm: verified credible compilation for LLVM
Production compilers such as GCC and LLVM are large complex software systems, for which achieving a high level of reliability is hard. Although testing is an effective method for finding bugs, it alone cannot guarantee a high level of reliability. To provide a higher level of reliability, many approaches that examine compilers' internal logics have been proposed. However, none of them have been successfully applied to major optimizations of production compilers. This paper presents Crellvm: a verified credible compilation framework for LLVM, which can be used as a systematic way of providing a high level of reliability for major optimizations in LLVM. Specifically, we augment an LLVM optimizer to generate translation results together with their correctness proofs, which can then be checked by a proof checker formally verified in Coq. As case studies, we applied our approach to two major optimizations of LLVM: register promotion mem2reg and global value numbering gvn, having found four new miscompilation bugs (two in each).
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