\newenvironment{matharray}[1]{\[\begin{array}{#1}}{\end{array}\]} % from 'iman.sty' \newcommand{\indexdef}[3]%
{\ifthenelse{\equal{}{#1}}{\index{#3 (#2)|bold}}{\index{#3 (#1\ #2)|bold}}} % from 'isar.sty'
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % fix for package declaration to be at the end \usepackage[pdfpagelabels, pageanchor=false, plainpages=false]{hyperref}
\title{Clean - An Abstract Imperative Programming Language and its Theory} \author{% \href{https://www.lri.fr/~ftuong/}{Fr\'ed\'eric Tuong} \and \href{https://www.lri.fr/~wolff/}{Burkhart Wolff} \\ \and
(with Contributions by \href{https://www.lri.fr/~keller/}{Chantal Keller})} \publishers{% \mbox{LRI, Univ. Paris-Sud, CNRS, Universit\'e Paris-Saclay} \\
b\^at. 650 Ada Lovelace, 91405 Orsay, France \texorpdfstring{\\}{}
}
\maketitle
\begin{abstract}
Clean is based on a simple, abstract execution model for an imperative target language. ``Abstract''
is understood as contrast to ``Concrete Semantics''; alternatively, the term ``shallow-style
embedding'' could be used. It strives for a type-safe notation of program-variables, an incremental
construction of the typed state-space, support of incremental verification, and
open-world extensibility of new type definitions being intertwined with the program
definitions.
Clean is based on a ``no-frills'' state-exception monad with the usual definitions of \isa{bind} and \isa{unit} for the compositional glue of state-based computations. Clean offers conditionals and
loops supporting C-like control-flow operators such as \isa{break} and \isa{return}. The state-space
construction is based on the extensible record package. Direct recursion of procedures is supported.
Clean's design strives for extreme simplicity. It is geared towards symbolic execution and proven
correct verification tools. The underlying libraries of this package, however, deliberately restrict
themselves to the most elementary infrastructure for these tasks. The package is intended to serve
as demonstrator semantic backend for Isabelle/C~\cite{Tuong-IsabelleC:2019}, or for the
test-generation techniques described in~\cite{DBLP:conf/tap/Keller18}. \end{abstract}
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