source: Deliverables/D4.2-4.3/reports/D4-3.tex @ 1366

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\title{
INFORMATION AND COMMUNICATION TECHNOLOGIES\\
(ICT)\\
PROGRAMME\\
\vspace*{1cm}Project FP7-ICT-2009-C-243881 \cerco{}}

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\begin{LARGE}
\textbf{
Report n. D4.3\\
Formal semantics of intermediate languages
}
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Version 1.0
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Main Authors:\\
Dominic P. Mulligan and Claudio Sacerdoti Coen
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\noindent
Project Acronym: \cerco{}\\
Project full title: Certified Complexity\\
Proposal/Contract no.: FP7-ICT-2009-C-243881 \cerco{}\\

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\paragraph{Abstract}

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\tableofcontents

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\section{Task}
\label{sect.task}

The Grant Agreement states that Task T4.3, entitled `Formal semantics of intermediate languages' has associated Deliverable D4.3, consisting of the following:
\begin{quotation}
Executable Formal Semantics of back-end intermediate languages: This prototype is the formal counterpart of deliverable D2.1 for the back end side of the compiler and validates it.
\end{quotation}
This report details our implementation of this deliverable.

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\subsection{Connections with other deliverables}
\label{subsect.connections.with.other.deliverables}

Deliverable D4.3 enjoys a close relationship with three other deliverables, namely deliverables D2.2, D4.3 and D4.4.

Deliverable D2.2, the O'Caml implementation of a cost preserving compiler for a large subset of the C programming language, is the basis upon which we have implemented the current deliverable.
In particular, the architecture of the compiler, its intermediate languages and their semantics, and the overall implementation of the Matita encodings has been taken from the O'Caml compiler.
Any variations from the O'Caml design are due to bugs identified in the prototype compiler during the Matita implementation, our identification of code that can be abstracted and made generic, or our use of Matita's much stronger type system to enforce invariants through the use of dependent types.

Deliverable D4.2 can be seen as a `sister' deliverable to the deliverable reported on herein.
In particular, where this deliverable reports on the encoding in the Calculus of Constructions of the backend semantics, D4.2 is the encoding in the Calculus of Constructions of the mutual translations of those languages.
As a result, a substantial amount of Matita code is shared between the two deliverables.

Deliverable D4.4, the backend correctness proofs, is the immediate successor of this deliverable.

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\section{The backend intermediate languages' semantics in Matita}
\label{sect.backend.intermediate.languages.semantics.matita}

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\subsection{Abstracting related languages}
\label{subsect.abstracting.related.languages}

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\subsection{Use of dependent types}
\label{subsect.use.of.dependent.types}

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\subsection{What we do not implement}
\label{subsect.what.we.do.not.implement}

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\section{Future work}
\label{sect.future.work}

\newpage

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\section{Code listing}
\label{sect.code.listing}

Semantics specific files (files relating to language translations ommitted):
\begin{center}
\begin{tabular*}{0.9\textwidth}{p{5cm}p{8cm}}
Title & Description \\
\hline
\texttt{RTLabs/syntax.ma} & The syntax of RTLabs \\
\texttt{joint/Joint.ma} & Abstracted syntax for backend languages \\
\texttt{RTL/RTL.ma} & The syntax of RTL \\
\texttt{ERTL/ERTL.ma} & The syntax of ERTL \\
\texttt{LTL/LTL.ma} & The syntax of LTL \\
\texttt{LIN/LIN.ma} & The syntax of LIN \\
\end{tabular*}
\end{center}

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\subsection{Listing of files}
\label{subsect.listing.files}

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\subsection{Listing of important functions and axioms}
\label{subsect.listing.important.functions.axioms}

\end{document}