Alt-Ergo
Developer(s)OCamlPro
Repository
TypeMathematical solver, program verifier
Websitehttps://alt-ergo.ocamlpro.com

Alt-Ergo, an automatic solver for mathematical formulas, is primarily utilized in program verification. It operates on the principle of satisfiability modulo theories (SMT) and is available under the open-source CeCILL-C license. The development of Alt-Ergo was undertaken by researchers at the Laboratoire de Recherche en Informatique, Inria Saclay Ile-de-France, and CNRS. Since 2013, the management and oversight of Alt-Ergo have been conducted by OCamlPro company[1].

Technologies

Design choices

Alt-Ergo employs a specialized input language with prenex polymorphism, designed to reduce the number of axioms requiring quantification and to simplify the complexity of problems. While Alt-Ergo offers partial support for the SMT-LIB 2 language, its efficiency with SMT files is comparatively limited.

Main components

The core architecture of Alt-Ergo comprises three main elements: a Depth-First Search (DFS)-based SAT solver, a quantifiers instantiation engine that uses E-Matching, and an assembly of decision procedures for a range of built-in theories. These components collectively enable Alt-Ergo's capabilities in automatic formula solving.

Built-in theories

Alt-Ergo implements (semi-)decision procedures for the following theories:

Industrial uses

There are several verification platforms built on top of Alt-Ergo:

  • Why3, a platform for deductive program verification, uses Alt-Ergo as its main prover;[2]
  • CAVEAT, a C-verifier developed by CEA and used by Airbus; Alt-Ergo was included in the qualification DO-178C of one of its aircraft;
  • Frama-C, a framework to analyse C-code, uses Alt-Ergo in the Jessie and WP plugins (dedicated to "deductive program verification");
  • SPARK, uses Alt-Ergo (behind GNATprove) to automate the verification of some assertions in Spark 2014;
  • Atelier-B can use Alt-Ergo instead of its main prover (increasing success from 84% to 98% on the ANR Bware project benchmarks);
  • Rodin, a B-method framework developed by Systerel, can use Alt-Ergo as a back-end;
  • Cubicle, an open source model checker for verifying safety properties of array-based transition systems.
  • EasyCrypt, a toolset for reasoning about relational properties of probabilistic computations with adversarial code.
  • BWARE[3]
  • Cafein[3]
  • FUI Hi-Lite[3]
  • Decert[3]
  • ADT Alt-Ergo[3]
  • A3PAT[3]

See also

References

  1. ↑ "About". alt-ergo.ocamlpro.com. Retrieved 2023-06-15.
  2. ↑ "Why3". why3.lri.fr. Retrieved 2023-06-15.
  3. 1 2 3 4 5 6 "The Alt-Ergo Theorem Prover: Academic Web Page". alt-ergo.lri.fr. Retrieved 2023-06-15.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.