Ignore:
Timestamp:
Sep 10, 2018, 5:17:27 PM (4 years ago)
Author:
Aaron Moss <a3moss@…>
Branches:
aaron-thesis, arm-eh, cleanup-dtors, deferred_resn, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, no_list, persistent-indexer
Children:
bedb40e
Parents:
514247d
Message:

CFA background information for thesis, mostly from comp II proposal

File:
1 edited

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  • doc/theses/aaron_moss/phd/introduction.tex

    r514247d r0cf9ffd  
    44In the 30 years since its first standardization, it has consistently been one of the most popular programming languages, with millions of lines of C code still in active use, and tens of thousands of trained programmers producing it. The TIOBE index\cite{TIOBE} tracks popularity of programming languages over time, and C has never dropped below second place:
    55
    6 \begin{table}
     6\begin{table}[h]
    77\label{tiobe-table}
    88\caption[TIOBE index over time]{Current top 5 places in the TIOBE index averaged over years}
     
    2020
    2121The impact of C on programming language design is also obvious from Table~\ref{tiobe-table}; with the exception of Python, all of the top five languages use C-like syntax and procedural control structures.
    22 \CC is even a largely backwards-compatible extension of C, with development dating back nearly as far as C itself.
     22\CC{} is even a largely backwards-compatible extension of C, with development dating back nearly as far as C itself.
    2323Though its lasting popularity and wide impact on programming language design point to the continued relevance of C, they also highlight the widespread desire of programmers for languages with more expressive power and programmer-friendly features; accommodating both low-impact maintenance of legacy C code and low-effort development of the software of the future is a difficult task for a single programming language.
    2424
     
    3030This thesis is focused on making \CFA{} a more powerful and expressive language, both by adding new features to the \CFA{} type system and ensuring that both added and existing features can be efficiently implemented in \CFACC{}, the \CFA{} reference compiler.
    3131Particular contributions of this work include design and implementation of
    32 parametric-polymorphic (``generic'') types in a manner compatible with the existing polymorphism design of \CFA{} (Chapter~\ref{generic-chap}), a type environment data structure based on a novel variant of the union-find algorithm (Chapter~\ref{env-chap}), and a new expression resolution algorithm designed to quickly locate the optimal declarations for a \CFA{} declaration (Chapter~\ref{resolution-chap}).
     32parametric-polymorphic (``generic'') types in a manner compatible with the existing polymorphism design of \CFA{} (Chapter~\ref{generic-chap}), a type environment data structure based on a novel variant of the union-find algorithm (Chapter~\ref{env-chap}), and a new expression resolution algorithm designed to quickly locate the optimal declarations for a \CFA{} expression (Chapter~\ref{resolution-chap}).
    3333This expression resolution algorithm was designed with the aid of a purpose-built prototype system which encapsulates the essential aspects of the \CFA{} type system without incurring the technical debt of the existing system or the friction-inducing necessity of maintaining a working compiler; the goal of this prototype system was to discover effective heuristics to avoid performing unnecessary work in the process of locating the optimal \CFA{} expression resolution.
    3434
    3535Though the direction and validation of this work was fairly narrowly focused on the \CFA{} programming language, the tools used and results obtained should be of interest to a wider compiler and programming language design community.
    3636In particular, with the addition of \emph{concepts} in \CCtwenty{}, conforming \CC{} compilers must support a model of type assertions very similar to that in \CFA{}, and the algorithmic techniques used in the expression resolution algorithm presented here may prove useful.
    37 Type environments are also widely modelled in compiler implementations, particularly of functional languages, though also increasingly commonly in other languages (such as Rust) which also perform type inference; the type environment presented here may be useful to those language implementers.
     37Type environments are also widely modelled in compiler implementations, particularly of functional languages, though also increasingly commonly in other languages (such as Rust) which perform type inference; the type environment presented here may be useful to those language implementers.
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