Understandable and Useful Error Messages for Liquid Types
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The document discusses challenges in producing useful error messages for liquid type systems like LiquidHaskell, Aeon, LiquidJava, and MLVP. It suggests improving error messages by only showing relevant context, substituting useless variables, simplifying redundant assertions, evidencing the minimal failing assertion, interactively expanding context, and indicating assertion provenance. Inspiration is drawn from the Lean 4 IDE and work by Tesla Zhang on simplifying proof context displays. The overall goal is to help developers better understand errors by filtering relevant information and simulating logical implications, rather than requiring them to do the work of an SMT solver.
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Clotho: Saving Programs from Malformed Strings and Incorrect String-handling Cybersecurity Education and Research Centre
Programs are susceptible to malformed data coming from untrusted sources. Occasionally the programming logic or constructs used are inappropriate to handle all types of constraints that are imposed by legal and well-formed data. As a result programs produce unexpected results or even worse, they may crash. Program behavior in both of these cases would be highly undesirable.
In this thesis work, we present a novel hybrid approach that saves programs from crashing when the failures originate from malformed strings or inappropriate handling of strings. Our approach statically analyses a program to identify statements that are vulnerable to failures related to associate string data. It then generates patches that are likely to satisfy constraints on the data, and in case of failures produce program behavior which would be close to the expected. The precision of the patches is improved with the help of a dynamic analysis. The patches are activated only after a failure is detected, and the technique incurs no runtime overhead during normal course of execution, and negligible overhead in case of failures.
We have experimented with Java String API, and applied Clotho to several hugely popular open-source libraries to patch 30 bugs, several of them rated either critical or major. Our evaluation shows that Clotho is both practical and effective. The comparison of the patches generated by our technique with the actual patches developed by the programmers in the later versions shows that they are semantically similar.Unevenly Distributed
Video and slides synchronized, mp3 and slide download available at URL http://bit.ly/1Uu0ooG.
For over a year now, Adrian has been reading a research paper every weekday and posting a summary to his blog, 'The Morning Paper.' This is the story of what he has learned on the journey - both as it relates to the value of reading papers, and of course, what they tell about what the future may hold for us! Filmed at qconlondon.com.
Adrian Colyer is Venture Partner at Accel Partners, London Author of 'The Morning Paper' (https://blog.acolyer.org). Previously he held CTO roles at SpringSource, VMware, and Pivotal.
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−1
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mô tả các thí nghiệm về đánh giá tác động dòng khí hóa sau đốt
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Understandable and Useful Error Messages for Liquid Types
- 1. Understandable and Useful Error Messages for Liquid Types Alcides Fonseca, Catarina Gamboa, João David, Guilherme Espada, Paulo Canelas Funded by FCT projects: UIDB/00408/2020, UIDP/00408/2020 LISBOA-01-0247-FEDER-045915 and EXPL/CCI-COM/1306/2021
- 2. GOAL Complaining about how hard it is to produce useful error messages for: • LiquidHaskell • Aeon • LiquidJava • MLVP Suggestions to improve error messages 2 80% 20%
- 3. LIQUID TYPES • Base Types: int, bool, fl oat, ... • Re fi nement Types: {x:Int | x > 3} • Dependent Types: (x:Int) -> {y:Int | y > x} 3 https://ucsd-progsys.github.io/liquidhaskell-blog/
- 4. CHALLENGES 4 • Everything in the context may be relevant • Developers need to select what may be relevant • There is a lot of redundancy (e.g., len v > 0 && len v >= 0) • Developers need to fi lter relevant assertions • To understand errors, developers need to simulate the logical implications from the context. • Developers are doing the work of the SMT solver!
- 5. CHALLENGES 5 • Liquid Type Checking relies heavily on rewrites: • Internal rewrite to ANF • Re fi nements renamed in function calls
- 6. AEON 6 def minimizeGoal(m:Int) -> r:Bool | m > -10 { fi b(m) > 30 } def f(i:Int, j:Int) -> k:Int | k > I+j and minimizeGoal(k) { ?? } Alcides Fonseca, Paulo Santos, and Sara Silva. "The Usability Argument for Refinement Typed Genetic Programming." International Conference on Parallel Problem Solving from Nature. Springer, Cham, 2020. SMT-based Program Synthesis Fitness Function for Property-Based Testing ?? :: {k:Int | k > I+j && k > -10} Another indirection layer!
- 7. LIQUIDJAVA 7 @Re fi nement("x > 10") int x = 11; x = x - 1; Catarina Gamboa, Paulo Canelas, Christopher Timperley, Alcides Fonseca. "User-driven design and evaluation of Liquid Types in Java." HATRA @ SPLASH 2021 Another indirection layer in the context! Context: x_global | x_global > 10 x_local_1 | x_local_1 == 11 x_local_2 | x_local_2 == x_local - 1 x == 11 - 1 → x > 10
- 9. IDEAS FOR IMPROVEMENT 1. Show only relevant context 2. Substitute useless variables 3. Simplify redundant assertions 4. Evidence the minimal failing assertion 5. Allow to interactively expand the context 6. Evidence assertion provenance (colors?) 9
- 10. INSPIRATION 10 Lean 4 VSCode Extension
- 13. Understandable and Useful Error Messages for Liquid Types Alcides Fonseca👨💻 , Catarina Gamboa👩🔬, João David, Guilherme Espada👨🔬, Paulo Canelas👨💻