Mercurial > archived > louis > epitech > mq > rathaxes
view doc_recap_some_important_thoughts_about_the_current_compiler.patch @ 141:85c2fa6f6bd8
Wrap-up wip
author | Louis Opter <kalessin@kalessin.fr> |
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date | Sat, 08 Feb 2014 18:28:44 -0800 |
parents | |
children | cbff597d307e |
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# HG changeset patch # Parent 01873f017f54a0c625261b8a1f27052219a00141 Recap important notes about the current compiler in a small document This should be used as a work document for the next compiler version. diff --git a/doc/rathaxes/technical/CMakeLists.txt b/doc/rathaxes/technical/CMakeLists.txt --- a/doc/rathaxes/technical/CMakeLists.txt +++ b/doc/rathaxes/technical/CMakeLists.txt @@ -15,3 +15,5 @@ INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/technical_documentation_en.pdf DESTINATION share/doc/rathaxes/) ENDFOREACH(I ${DOCS}) + +ADD_LATEX_DOCUMENT(rtx_2k12_wrap_up.tex DEFAULT_PDF MANGLE_TARGET_NAMES) diff --git a/doc/rathaxes/technical/rtx_2k12_wrap_up.tex b/doc/rathaxes/technical/rtx_2k12_wrap_up.tex new file mode 100644 --- /dev/null +++ b/doc/rathaxes/technical/rtx_2k12_wrap_up.tex @@ -0,0 +1,113 @@ +\documentclass[american]{rtxarticle} + +\title{Rathaxes 2012 wrap-up} + +\author{Louis Opter} + +\begin{document} + +\maketitle + +\begin{abstract} +The second version of the Rathaxes compiler, \emph{Rathaxes 2012}, started in +2010 has been sunset in 2013. This document aims to highlight the issues and +the lessons learned while trying to recode an e1000 driver with this compiler +version. + +This document should serve as a reference for the next version of the Rathaxes +compiler implemented in Python 3 with Pyrser. +\end{abstract} + +\section{Design issues} + +\subsection{Unused features} + +The following compiler features: + +\begin{itemize} +\item Advanced chunk selection (using the \texttt{with} statement); +\item Register declarations. +\end{itemize} + +Turned out to unecessary because: + +\begin{itemize} +\item We decided to scope the first driver to a single kernel (Linux 2.6.32 and + then 3.2.0); +\item Register declarations were not clearly wired to the rest of the language + and were simply too advanced to be used at first; +\item Challenges appeared at other places. +\end{itemize} + +It's also interesting to note that sequences weren't used to define algorithms +as planned but were re-fitted as ``functions'' as we started to write object +oriented code around Rathaxes types. Some sequences are also used to logically +regroup chunks and pointcut but those chunks could be moved to types or could +directly be top-level declarations within their interface. + +\subsection{Features we missed} + +The following compiler features: + +\begin{itemize} +\item ``Object model''; +\item Ref/Scalar; +\item Error handling; +\item Variadic sequences; +\item Arrays support; +\item Comments passthrough; +\item Type coercion to \texttt{Builtin::symbol}. +\end{itemize} + +Are really needed. + +\subsubsection{``Object model''} + +The driver code started to organically organize itself into types with methods +and attributes that loosely correspond to classes. We ran different into +issues: + +\begin{itemize} +\item Methods call aren't working; +\item Type dependencies aren't resolved correctly, so they aren't generated in + the right order; +\item \texttt{\$\{self\}} is ambiguous, how do you know when it's a scalar or a + method? (this is important to define the init method); +\item Abstract data types should probably be framed/defined in the language; +\item Mappings aren't resolved recursively; +\item Mappings can't use Rathaxes code in them (e.g: you can't use + \texttt{\$\{Rathaxes::Type.ref\}} in a mapping definition); +\item Circular dependencies aren't supported (in e1000 the rings and the + hardware context are inter-dependant, you can't avoid that); +\item Type injections in upper sub-system (i.e: inject \texttt{e1000::Context} + into \texttt{Ethernet::Device}), that has been implemented with regular + pointcut but we need another kind of pointcut to only weave the type (and + not the full structure field). +\end{itemize} + +\subsubsection{Error handling} + +This has been deliberately left out in Rathaxes 2012 but it seems that the +biggest difficulty is going to define and then inject the error handling code +into the parent chunk/context appropriately. + +\section{Implementation issues} + +Some bugs are imparing development: + +\begin{itemize} +\item Expansion bugs: +\begin{itemize} +\item Obscure expansion issues solved by scoping thigns; +\item Variable declarations leaking across different chunks; +\item Chunk/Pointcut parameters not bound to the C variables (the parameters + must be named like the C variables are). +\end{itemize} +\item CNorm issues: it's impossible to use annotation (e.g: \texttt{\_\_init}, + \texttt{\_\_exit}, \texttt{\_\_iomem}, \ldots) or arbitrary typedef'd + types; +\item Some sequences call aren't working for obscure reasons (e.g: + \texttt{DMA::unmap}). +\end{itemize} + +\end{document} diff --git a/rathaxes/samples/e1000/e1000.blt b/rathaxes/samples/e1000/e1000.blt --- a/rathaxes/samples/e1000/e1000.blt +++ b/rathaxes/samples/e1000/e1000.blt @@ -809,7 +809,7 @@ chunk LKM::code() { - static int rtx_e1000_tx_ring_alloc_resources(${e1000::TxRing.ref} self) + static int rtx_e1000_tx_ring_alloc_resources(${e1000:::TxRing.ref} self) { ${Log::info("e1000_tx_ring_alloc_resources: TBD...")}; return 0;