| author | Christian Urban <christian.urban@kcl.ac.uk> |
| Wed, 04 Nov 2020 17:34:52 +0000 | |
| changeset 799 | 85267be9a5ed |
| parent 750 | e93a9e74ca8e |
| child 803 | d4fb8c7fc3bf |
| permissions | -rw-r--r-- |
| 666 | 1 |
% !TEX program = xelatex |
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\documentclass[dvipsnames,14pt,t,xelatex,aspectratio=169,xcolor={table}]{beamer}
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\usepackage{../slides}
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\usepackage{../graphics}
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\usepackage{../langs}
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\usepackage{../data}
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\usepackage{../grammar}
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% beamer stuff |
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\renewcommand{\slidecaption}{CFL 06, King's College London}
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\newcommand{\bl}[1]{\textcolor{blue}{#1}}
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%\newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}% for definitions
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\newcommand{\qq}{\mbox{\texttt{"}}}
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\begin{document}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[t]
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\frametitle{%
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\begin{tabular}{@ {}c@ {}}
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\\[-3mm] |
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\LARGE Compilers and \\[-2mm] |
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\LARGE Formal Languages\\[3mm] |
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\end{tabular}}
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\normalsize |
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\begin{center}
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\begin{tabular}{ll}
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Email: & christian.urban at kcl.ac.uk\\ |
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%Office Hours: & Thursdays 12 -- 14\\ |
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%Location: & N7.07 (North Wing, Bush House)\\ |
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Slides \& Progs: & KEATS (also homework is there)\\ |
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\end{tabular}
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\end{center}
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\begin{center}
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\begin{tikzpicture}
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\node[drop shadow,fill=white,inner sep=0pt] |
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{\footnotesize\rowcolors{1}{capri!10}{white}
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\begin{tabular}{|p{4.8cm}|p{4.8cm}|}\hline
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1 Introduction, Languages & \cellcolor{blue!50} 6 While-Language \\
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2 Regular Expressions, Derivatives & 7 Compilation, JVM \\ |
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3 Automata, Regular Languages & 8 Compiling Functional Languages \\ |
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4 Lexing, Tokenising & 9 Optimisations \\ |
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5 Grammars, Parsing & 10 LLVM \\ \hline |
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\end{tabular}%
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}; |
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\end{tikzpicture}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Parser Combinators}
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One of the simplest ways to implement a parser, see |
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{\small\url{https://vimeo.com/142341803}} (by Haoyi Li)\bigskip
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\begin{itemize}
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\item[$\bullet$] build-in library in Scala |
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\item[$\bullet$] fastparse (2) library by Haoyi Li; is part of Ammonite |
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\item[$\bullet$] possible exponential runtime behaviour |
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\end{itemize}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Parser Combinators}
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Parser combinators: \bigskip |
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\begin{minipage}{1.1\textwidth}
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\begin{center}
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\mbox{}\hspace{-12mm}\mbox{}$\underbrace{\text{list of tokens}}_{\text{input}}$ \bl{$\Rightarrow$}
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$\underbrace{\text{set of (parsed input, unparsed input)}}_{\text{output}}$
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\end{center}
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\end{minipage}\bigskip
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\begin{itemize}
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\item atomic parsers |
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\item sequencing |
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\item alternative |
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\item semantic action (map-parser) |
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\end{itemize}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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Atomic parsers, for example, number tokens |
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\begin{center}
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\bl{$\texttt{Num(123)}::rest \;\Rightarrow\; \{(\texttt{Num(123)}, rest)\}$}
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\end{center}\bigskip
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\begin{itemize}
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\item you consume one or more token from the\\ |
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input (stream) |
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\item also works for characters and strings |
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\end{itemize}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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Alternative parser (code \bl{$p\;||\;q$})\bigskip
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\begin{itemize}
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\item apply \bl{$p$} and also \bl{$q$}; then combine
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the outputs |
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\end{itemize}
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\begin{center}
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\large \bl{$p(\text{input}) \cup q(\text{input})$}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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Sequence parser (code \bl{$p\sim q$})\bigskip
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\begin{itemize}
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\item apply first \bl{$p$} producing a set of pairs
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\item then apply \bl{$q$} to the unparsed part
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\item then combine the results:\medskip |
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\begin{center}
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((output$_1$, output$_2$), unparsed part) |
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\end{center}
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\end{itemize}
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\begin{center}
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\begin{tabular}{l}
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\large \bl{$\{((o_1, o_2), u_2) \;|\;$}\\[2mm]
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\large\mbox{}\hspace{15mm} \bl{$(o_1, u_1) \in p(\text{input}) \wedge$}\\[2mm]
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\large\mbox{}\hspace{15mm} \bl{$(o_2, u_2) \in q(u_1)\}$}
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\end{tabular}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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Map-parser (code \bl{$p.map(f)\;$})\bigskip
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\begin{itemize}
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\item apply \bl{$p$} producing a set of pairs
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\item then apply the function \bl{$f$} to each first component
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\end{itemize}
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\begin{center}
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\begin{tabular}{l}
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\large \bl{$\{(f(o_1), u_1) \;|\; (o_1, u_1) \in p(\text{input})\}$}
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\end{tabular}
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\end{center}\bigskip\bigskip\pause
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\bl{$f$} is the semantic action (``what to do with the parsed input'')
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Semantic Actions\end{tabular}}
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Addition |
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\begin{center}
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\bl{$\meta{T} \sim + \sim \meta{E} \Rightarrow \underbrace{f\,((x,y), z) \Rightarrow x + z}_{\text{semantic action}}$}
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\end{center}\pause
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Multiplication |
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\begin{center}
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\bl{$\meta{F} \sim * \sim \meta{T} \Rightarrow f\,((x,y), z) \Rightarrow x * z$}
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\end{center}\pause
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Parenthesis |
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\begin{center}
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\bl{$\text{(} \sim \meta{E} \sim \text{)} \Rightarrow f\,((x,y), z) \Rightarrow y$}
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\end{center}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Types of Parsers}
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\begin{itemize}
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\item {\bf Sequencing}: if \bl{$p$} returns results of type \bl{$T$}, and \bl{$q$} results of type \bl{$S$},
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then \bl{$p \sim q$} returns results of type
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\begin{center}
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\bl{$T \times S$}
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\end{center}\pause
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\item {\bf Alternative}: if \bl{$p$} returns results of type \bl{$T$} then \bl{$q$} \alert{must} also have results of type \bl{$T$},
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and \bl{$p \;||\; q$} returns results of type
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\begin{center}
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\bl{$T$}
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\end{center}\pause
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\item {\bf Semantic Action}: if \bl{$p$} returns results of type \bl{$T$} and \bl{$f$} is a function from
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\bl{$T$} to \bl{$S$}, then
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\bl{$p \Rightarrow f$} returns results of type
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\begin{center}
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\bl{$S$}
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\end{center}
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\end{itemize}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Input Types of Parsers}
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\begin{itemize}
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\item input: \alert{token list}
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\item output: set of (output\_type, \alert{token list})
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\end{itemize}\bigskip\pause
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actually it can be any input type as long as it is a kind of |
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sequence (for example a string) |
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Scannerless Parsers}
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\begin{itemize}
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\item input: \alert{string}
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\item output: set of (output\_type, \alert{string})
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\end{itemize}\bigskip\bigskip
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but using lexers is better because whitespaces or comments can be |
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filtered out; then input is a sequence of tokens |
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Successful Parses}
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\begin{itemize}
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\item input: string |
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\item output: \alert{set of} (output\_type, string)
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\end{itemize}\bigskip
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a parse is successful whenever the input has been fully |
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``consumed'' (that is the second component is empty) |
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Abstract Parser Class}
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\small |
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\lstinputlisting[language=Scala,xleftmargin=1mm] |
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{../progs/app7.scala}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\small |
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\fontsize{10}{12}\selectfont
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\lstinputlisting[language=Scala,xleftmargin=1mm] |
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{../progs/app8.scala}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Two Grammars}
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Which languages are recognised by the following two grammars? |
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\begin{center}
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\bl{\begin{tabular}{lcl}
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$\meta{S}$ & $\rightarrow$ & $1 \cdot \meta{S} \cdot \meta{S}$\\
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& $|$ & $\epsilon$ |
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\end{tabular}}
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\end{center}\bigskip
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\begin{center}
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\bl{\begin{tabular}{lcl}
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$\meta{U}$ & $\rightarrow$ & $1 \cdot \meta{U}$\\
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& $|$ & $\epsilon$ |
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\end{tabular}}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[t]
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\frametitle{Ambiguous Grammars}
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\begin{center}
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\begin{tikzpicture}
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\begin{axis}[xlabel={\pcode{1}s},ylabel={time in secs},
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enlargelimits=false, |
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xtick={0,100,...,1000},
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xmax=1050, |
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ymax=33, |
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ytick={0,5,...,30},
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scaled ticks=false, |
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axis lines=left, |
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width=11cm, |
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height=7cm, |
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legend entries={unambiguous,ambiguous},
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legend pos=north east, |
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legend cell align=left, |
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x tick label style={font=\small,/pgf/number format/1000 sep={}}]
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\addplot[blue,mark=*, mark options={fill=white}]
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table {s-grammar1.data};
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\only<2>{
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\addplot[red,mark=triangle*, mark options={fill=white}]
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table {s-grammar2.data};}
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\end{axis}
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\end{tikzpicture}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}
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\frametitle{While-Language}
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\mbox{}\\[-23mm]\mbox{}
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\bl{\begin{plstx}[rhs style=,one per line]: \meta{Stmt} ::= skip
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| \meta{Id} := \meta{AExp}
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| if \meta{BExp} then \meta{Block} else \meta{Block}
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| while \meta{BExp} do \meta{Block}\\
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: \meta{Stmts} ::= \meta{Stmt} ; \meta{Stmts}
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| \meta{Stmt}\\
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: \meta{Block} ::= \{ \meta{Stmts} \}
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| \meta{Stmt}\\
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: \meta{AExp} ::= \ldots\\
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: \meta{BExp} ::= \ldots\\\end{plstx}}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{An Interpreter}
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\begin{center}
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\bl{\begin{tabular}{l}
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$\{$\\
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\;\;$x := 5 \text{;}$\\
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\;\;$y := x * 3\text{;}$\\
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\;\;$y := x * 4\text{;}$\\
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\;\;$x := u * 3$\\ |
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$\}$ |
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\end{tabular}}
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\end{center}
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\begin{itemize}
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\item the interpreter has to record the value of \bl{$x$} before assigning a value to \bl{$y$}\pause
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\item \bl{\texttt{eval(stmt, env)}}
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\end{itemize}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Interpreter\end{tabular}}
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\begin{center}
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\bl{\begin{tabular}{@{}lcl@{}}
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$\text{eval}(n, E)$ & $\dn$ & $n$\\
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$\text{eval}(x, E)$ & $\dn$ & $E(x)$ \;\;\;\textcolor{black}{lookup \bl{$x$} in \bl{$E$}}\\
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$\text{eval}(a_1 + a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) + \text{eval}(a_2, E)$\\
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$\text{eval}(a_1 - a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) - \text{eval}(a_2, E)$\\
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$\text{eval}(a_1 * a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) * \text{eval}(a_2, E)$\bigskip\\
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$\text{eval}(a_1 = a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) = \text{eval}(a_2, E)$\\
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|
413 |
$\text{eval}(a_1\,!\!= a_2, E)$ & $\dn$ & $\neg(\text{eval}(a_1, E) = \text{eval}(a_2, E))$\\
|
|
414 |
$\text{eval}(a_1 < a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) < \text{eval}(a_2, E)$\
|
|
415 |
\end{tabular}}
|
|
416 |
\end{center}
|
|
417 |
||
418 |
\end{frame}}
|
|
419 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
420 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
421 |
\mode<presentation>{
|
|
422 |
\begin{frame}[c]
|
|
423 |
\frametitle{\begin{tabular}{c}Interpreter (2)\end{tabular}}
|
|
424 |
||
425 |
\begin{center}
|
|
426 |
\bl{\begin{tabular}{@{}lcl@{}}
|
|
427 |
$\text{eval}(\text{skip}, E)$ & $\dn$ & $E$\\
|
|
428 |
$\text{eval}(x:=a, E)$ & $\dn$ & \bl{$E(x \mapsto \text{eval}(a, E))$}\\
|
|
429 |
\multicolumn{3}{@{}l@{}}{$\text{eval}(\text{if}\;b\;\text{then}\;cs_1\;\text{else}\;cs_2 , E) \dn$}\\
|
|
430 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\text{if}\;\text{eval}(b,E)\;\text{then}\;
|
|
431 |
\text{eval}(cs_1,E)$}\\
|
|
432 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\phantom{\text{if}\;\text{eval}(b,E)\;}\text{else}\;\text{eval}(cs_2,E)$}\\
|
|
433 |
\multicolumn{3}{@{}l@{}}{$\text{eval}(\text{while}\;b\;\text{do}\;cs, E) \dn$}\\
|
|
434 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\text{if}\;\text{eval}(b,E)$}\\
|
|
435 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\text{then}\;
|
|
436 |
\text{eval}(\text{while}\;b\;\text{do}\;cs, \text{eval}(cs,E))$}\\
|
|
437 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\text{else}\; E$}\\
|
|
438 |
$\text{eval}(\text{write}\; x, E)$ & $\dn$ & $\{\;\text{println}(E(x))\; ;\;E\;\}$\\
|
|
439 |
\end{tabular}}
|
|
440 |
\end{center}
|
|
441 |
||
442 |
\end{frame}}
|
|
443 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
444 |
||
445 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
446 |
\begin{frame}[c]
|
|
447 |
\frametitle{Test Program}
|
|
448 |
||
449 |
\mbox{}\\[-18mm]\mbox{}
|
|
450 |
||
451 |
??%{\lstset{language=While}%%\fontsize{10}{12}\selectfont
|
|
452 |
%\texttt{\lstinputlisting{../progs/loops.while}}}
|
|
453 |
||
454 |
\end{frame}
|
|
455 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
456 |
||
457 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
458 |
\mode<presentation>{
|
|
459 |
\begin{frame}[t]
|
|
460 |
\frametitle{\begin{tabular}{c}Interpreted Code\end{tabular}}
|
|
461 |
||
462 |
\begin{center}
|
|
463 |
\begin{tikzpicture}
|
|
464 |
\begin{axis}[axis x line=bottom, axis y line=left, xlabel=n, ylabel=secs, legend style=small]
|
|
465 |
\addplot+[smooth] file {interpreted.data};
|
|
466 |
\end{axis}
|
|
467 |
\end{tikzpicture}
|
|
468 |
\end{center}
|
|
469 |
||
470 |
\end{frame}}
|
|
471 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
472 |
||
473 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
474 |
\mode<presentation>{
|
|
475 |
\begin{frame}[c]
|
|
476 |
\frametitle{\begin{tabular}{c}Java Virtual Machine\end{tabular}}
|
|
477 |
||
478 |
\begin{itemize}
|
|
479 |
\item introduced in 1995 |
|
480 |
\item is a stack-based VM (like Postscript, CLR of .Net) |
|
481 |
\item contains a JIT compiler |
|
482 |
\item many languages take advantage of JVM's infrastructure (JRE) |
|
483 |
\item is garbage collected $\Rightarrow$ no buffer overflows |
|
484 |
\item some languages compile to the JVM: Scala, Clojure\ldots |
|
485 |
\end{itemize}
|
|
486 |
||
487 |
\end{frame}}
|
|
488 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
489 |
||
490 |
||
491 |
||
492 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
493 |
\begin{frame}[t]
|
|
494 |
\frametitle{%
|
|
495 |
\begin{tabular}{@ {}c@ {}}
|
|
496 |
\\[-3mm] |
|
497 |
\LARGE Compilers and \\[-2mm] |
|
498 |
\LARGE Formal Languages\\[3mm] |
|
499 |
\end{tabular}}
|
|
500 |
||
501 |
\normalsize |
|
502 |
\begin{center}
|
|
503 |
\begin{tabular}{ll}
|
|
504 |
Email: & christian.urban at kcl.ac.uk\\ |
|
505 |
%Office Hours: & Thursdays 12 -- 14\\ |
|
506 |
%Location: & N7.07 (North Wing, Bush House)\\ |
|
507 |
Slides \& Progs: & KEATS (also homework is there)\\ |
|
508 |
\end{tabular}
|
|
509 |
\end{center}
|
|
510 |
||
511 |
\begin{center}
|
|
512 |
\begin{tikzpicture}
|
|
513 |
\node[drop shadow,fill=white,inner sep=0pt] |
|
514 |
{\footnotesize\rowcolors{1}{capri!10}{white}
|
|
515 |
\begin{tabular}{|p{4.8cm}|p{4.8cm}|}\hline
|
|
516 |
1 Introduction, Languages & \cellcolor{blue!50} 6 While-Language \\
|
|
517 |
2 Regular Expressions, Derivatives & 7 Compilation, JVM \\ |
|
518 |
3 Automata, Regular Languages & 8 Compiling Functional Languages \\ |
|
519 |
4 Lexing, Tokenising & 9 Optimisations \\ |
|
520 |
5 Grammars, Parsing & 10 LLVM \\ \hline |
|
521 |
\end{tabular}%
|
|
522 |
}; |
|
523 |
\end{tikzpicture}
|
|
524 |
\end{center}
|
|
525 |
||
526 |
\end{frame}
|
|
527 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
528 |
||
529 |
||
530 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 531 | 531 |
% \begin{frame}[c]
|
532 |
% \small |
|
533 |
% \mbox{}\\[5mm]
|
|
534 |
% %\begin{textblock}{10}(3,5)
|
|
535 |
% \begin{tikzpicture}[scale=1.5,
|
|
536 |
% node distance=1cm, |
|
537 |
% every node/.style={minimum size=7mm}]
|
|
538 |
% \node (r1) {\bl{$r_1$}};
|
|
539 |
% \node (r2) [right=of r1] {\bl{$r_2$}};
|
|
540 |
% \draw[->,line width=1mm] (r1) -- (r2) node[above,midway] {\bl{$der\,a$}};
|
|
541 |
% \node (r3) [right=of r2] {\bl{$r_3$}};
|
|
542 |
% \draw[->,line width=1mm] (r2) -- (r3) node[above,midway] {\bl{$der\,b$}};
|
|
543 |
% \node (r4) [right=of r3] {\bl{$r_4$}};
|
|
544 |
% \draw[->,line width=1mm] (r3) -- (r4) node[above,midway] {\bl{$der\,c$}};
|
|
545 |
% \draw (r4) node[anchor=west] {\;\raisebox{3mm}{\bl{$nullable$}}};
|
|
546 |
% \node (v4) [below=of r4] {\bl{$v_4$}};
|
|
547 |
% \draw[->,line width=1mm] (r4) -- (v4); |
|
548 |
% \node (v3) [left=of v4] {\bl{$v_3$}};
|
|
549 |
% \draw[->,line width=1mm] (v4) -- (v3) node[below,midway] {\bl{$inj\,c$}};
|
|
550 |
% \node (v2) [left=of v3] {\bl{$v_2$}};
|
|
551 |
% \draw[->,line width=1mm] (v3) -- (v2) node[below,midway] {\bl{$inj\,b$}};
|
|
552 |
% \node (v1) [left=of v2] {\bl{$v_1$}};
|
|
553 |
% \draw[->,line width=1mm] (v2) -- (v1) node[below,midway] {\bl{$inj\,a$}};
|
|
554 |
% \draw[->,line width=0.5mm] (r3) -- (v3); |
|
555 |
% \draw[->,line width=0.5mm] (r2) -- (v2); |
|
556 |
% \draw[->,line width=0.5mm] (r1) -- (v1); |
|
557 |
% \draw (r4) node[anchor=north west] {\;\raisebox{-8mm}{\bl{$mkeps$}}};
|
|
558 |
% \end{tikzpicture}
|
|
559 |
% %\end{textblock}
|
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
560 |
|
| 531 | 561 |
% \begin{center}
|
562 |
% \begin{tabular}{l@{\hspace{1mm}}c@{\hspace{1mm}}l}
|
|
563 |
% \\[-10mm] |
|
564 |
% \bl{$inj\,(c)\,c\,Empty$} & \bl{$\dn$} & \bl{$Char\,c$}\\
|
|
565 |
% \bl{$inj\,(r_1 + r_2)\,c\,Left(v)$} & \bl{$\dn$} & \bl{$Left(inj\,r_1\,c\,v)$}\\
|
|
566 |
% \bl{$inj\,(r_1 + r_2)\,c\,Right(v)$} & \bl{$\dn$} & \bl{$Right(inj\,r_2\,c\,v)$}\\
|
|
567 |
% \bl{$inj\,(r_1 \cdot r_2)\,c\,Seq(v_1,v_2)$} & \bl{$\dn$} & \bl{$Seq(inj\,r_1\,c\,v_1,v_2)$}\\
|
|
568 |
% \bl{$inj\,(r_1 \cdot r_2)\,c\,Left(Seq(v_1,v_2))$} & \bl{$\dn$} & \bl{$Seq(inj\,r_1\,c\,v_1,v_2)$}\\
|
|
569 |
% \bl{$inj\,(r_1 \cdot r_2)\,c\,Right(v)$} & \bl{$\dn$} & \bl{$Seq(mkeps(r_1),inj\,r_2\,c\,v)$}\\
|
|
570 |
% \bl{$inj\,(r^*)\,c\,Seq(v,vs)$} & \bl{$\dn$} & \bl{$inj\,r\,c\,v\,::\,vs$}\\
|
|
571 |
% \end{tabular}
|
|
572 |
% \end{center}
|
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
573 |
|
| 531 | 574 |
% \end{frame}
|
575 |
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
576 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
577 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 683 | 578 |
\begin{frame}[t]
|
579 |
\frametitle{Starting Symbol}
|
|
580 |
||
581 |
\bl{\begin{plstx}[margin=1cm]
|
|
582 |
: \meta{S} ::= \meta{A}\cdot\meta{S}\cdot\meta{B} |
|
|
583 |
\meta{B}\cdot\meta{S}\cdot\meta{A} | \epsilon\\
|
|
584 |
: \meta{A} ::= a | \epsilon\\
|
|
585 |
: \meta{B} ::= b\\
|
|
586 |
\end{plstx}}
|
|
587 |
||
| 750 | 588 |
|
589 |
TODO: Testcases for math expressions |
|
590 |
\url{https://github.com/ArashPartow/math-parser-benchmark-project}
|
|
591 |
||
| 683 | 592 |
\end{frame}
|
593 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
594 |
||
595 |
||
596 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
597 |
\begin{frame}[c]
|
| 683 | 598 |
\frametitle{Hierarchy of Languages}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
599 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
600 |
Recall that languages are sets of strings. |
|
295
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
601 |
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
602 |
\begin{center}
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
603 |
\begin{tikzpicture}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
604 |
[rect/.style={draw=black!50, top color=white,bottom color=black!20, rectangle, very thick, rounded corners}]
|
|
295
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
605 |
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
606 |
\draw (0,0) node [rect, text depth=39mm, text width=68mm] {all languages};
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
607 |
\draw (0,-0.4) node [rect, text depth=28.5mm, text width=64mm] {decidable languages};
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
608 |
\draw (0,-0.85) node [rect, text depth=17mm] {context sensitive languages};
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
609 |
\draw (0,-1.14) node [rect, text depth=9mm, text width=50mm] {context-free languages};
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
610 |
\draw (0,-1.4) node [rect] {regular languages};
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
611 |
\end{tikzpicture}
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
612 |
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
613 |
\end{center}
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
614 |
|
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
615 |
\end{frame}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
616 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
617 |
|
| 531 | 618 |
|
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
619 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
620 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
621 |
\begin{frame}[c]
|
| 598 | 622 |
\frametitle{Parser Combinators}
|
623 |
||
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
624 |
Atomic parsers, for example |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
625 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
626 |
\begin{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
627 |
\bl{$1::rest \;\Rightarrow\; \{(1, rest)\}$}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
628 |
\end{center}\bigskip
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
629 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
630 |
\begin{itemize}
|
| 597 | 631 |
\item you consume one or more tokens from the\\ |
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
632 |
input (stream) |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
633 |
\item also works for characters and strings |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
634 |
\end{itemize}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
635 |
\end{frame}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
636 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
637 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
638 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
639 |
\begin{frame}[c]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
640 |
|
| 686 | 641 |
Alternative parser (code \bl{$p\;|\;q$})\bigskip
|
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
642 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
643 |
\begin{itemize}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
644 |
\item apply \bl{$p$} and also \bl{$q$}; then combine
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
645 |
the outputs |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
646 |
\end{itemize}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
647 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
648 |
\begin{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
649 |
\large \bl{$p(\text{input}) \cup q(\text{input})$}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
650 |
\end{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
651 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
652 |
\end{frame}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
653 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
654 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
655 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
656 |
\begin{frame}[c]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
657 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
658 |
Sequence parser (code \bl{$p\sim q$})\bigskip
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
659 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
660 |
\begin{itemize}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
661 |
\item apply first \bl{$p$} producing a set of pairs
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
662 |
\item then apply \bl{$q$} to the unparsed parts
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
663 |
\item then combine the results:\medskip |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
664 |
\begin{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
665 |
((output$_1$, output$_2$), unparsed part) |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
666 |
\end{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
667 |
\end{itemize}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
668 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
669 |
\begin{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
670 |
\begin{tabular}{l}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
671 |
\large \bl{$\{((o_1, o_2), u_2) \;|\;$}\\[2mm]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
672 |
\large\mbox{}\hspace{15mm} \bl{$(o_1, u_1) \in p(\text{input}) \wedge$}\\[2mm]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
673 |
\large\mbox{}\hspace{15mm} \bl{$(o_2, u_2) \in q(u_1)\}$}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
674 |
\end{tabular}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
675 |
\end{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
676 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
677 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
678 |
\end{frame}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
679 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
680 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
681 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
682 |
\begin{frame}[c]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
683 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
684 |
Function parser (code \bl{$p \Rightarrow f\;$})\bigskip
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
685 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
686 |
\begin{itemize}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
687 |
\item apply \bl{$p$} producing a set of pairs
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
688 |
\item then apply the function \bl{$f$} to each first component
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
689 |
\end{itemize}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
690 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
691 |
\begin{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
692 |
\begin{tabular}{l}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
693 |
\large \bl{$\{(f(o_1), u_1) \;|\; (o_1, u_1) \in p(\text{input})\}$}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
694 |
\end{tabular}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
695 |
\end{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
696 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
697 |
\end{frame}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
698 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
699 |
|
| 531 | 700 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
701 |
\begin{frame}[c]
|
|
702 |
\frametitle{Types of Parsers}
|
|
703 |
||
704 |
\begin{itemize}
|
|
705 |
\item {\bf Sequencing}: if \bl{$p$} returns results of type \bl{$T$}, and \bl{$q$} results of type \bl{$S$},
|
|
706 |
then \bl{$p \sim q$} returns results of type
|
|
707 |
||
708 |
\begin{center}
|
|
709 |
\bl{$T \times S$}
|
|
710 |
\end{center}\pause
|
|
711 |
||
712 |
\item {\bf Alternative}: if \bl{$p$} returns results of type \bl{$T$} then \bl{$q$} \alert{must} also have results of type \bl{$T$},
|
|
| 686 | 713 |
and \bl{$p \;|\; q$} returns results of type
|
| 531 | 714 |
|
715 |
\begin{center}
|
|
716 |
\bl{$T$}
|
|
717 |
\end{center}\pause
|
|
718 |
||
719 |
\item {\bf Semantic Action}: if \bl{$p$} returns results of type \bl{$T$} and \bl{$f$} is a function from
|
|
720 |
\bl{$T$} to \bl{$S$}, then
|
|
721 |
\bl{$p \Rightarrow f$} returns results of type
|
|
722 |
||
723 |
\begin{center}
|
|
724 |
\bl{$S$}
|
|
725 |
\end{center}
|
|
726 |
||
727 |
\end{itemize}
|
|
728 |
||
729 |
\end{frame}
|
|
730 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
731 |
||
732 |
||
733 |
||
734 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
735 |
\begin{frame}[c]
|
|
736 |
\frametitle{Two Grammars}
|
|
737 |
||
738 |
Which languages are recognised by the following two grammars? |
|
739 |
||
| 597 | 740 |
\bl{\begin{plstx}[margin=3cm]
|
741 |
: \meta{S} ::= \liningnums{1}\cdot\meta{S}\cdot \meta{S} | \epsilon\\
|
|
742 |
\end{plstx}}
|
|
| 531 | 743 |
|
| 597 | 744 |
\bl{\begin{plstx}[margin=3cm]
|
745 |
: \meta{U} ::= \liningnums{1}\cdot\meta{U} | \epsilon\\
|
|
746 |
\end{plstx}}
|
|
| 531 | 747 |
|
748 |
\end{frame}
|
|
749 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
750 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
751 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
752 |
\begin{frame}[t]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
753 |
\frametitle{Ambiguous Grammars}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
754 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
755 |
\begin{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
756 |
\begin{tikzpicture}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
757 |
\begin{axis}[xlabel={\pcode{1}s},ylabel={time in secs},
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
758 |
enlargelimits=false, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
759 |
xtick={0,100,...,1000},
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
760 |
xmax=1050, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
761 |
ymax=33, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
762 |
ytick={0,5,...,30},
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
763 |
scaled ticks=false, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
764 |
axis lines=left, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
765 |
width=11cm, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
766 |
height=7cm, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
767 |
legend entries={unambiguous,ambiguous},
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
768 |
legend pos=north east, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
769 |
legend cell align=left, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
770 |
x tick label style={font=\small,/pgf/number format/1000 sep={}}]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
771 |
\addplot[blue,mark=*, mark options={fill=white}]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
772 |
table {s-grammar1.data};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
773 |
\only<2>{
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
774 |
\addplot[red,mark=triangle*, mark options={fill=white}]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
775 |
table {s-grammar2.data};}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
776 |
\end{axis}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
777 |
\end{tikzpicture}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
778 |
\end{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
779 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
780 |
\end{frame}
|
|
295
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
781 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
782 |
|
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
783 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
784 |
\begin{frame}[c]
|
| 597 | 785 |
\frametitle{Arithmetic Expressions}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
786 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
787 |
A grammar for arithmetic expressions and numbers: |
| 50 | 788 |
|
| 597 | 789 |
\bl{\begin{plstx}[margin=1cm]
|
790 |
: \meta{E} ::= \meta{E} \cdot + \cdot \meta{E}
|
|
791 |
| \meta{E} \cdot * \cdot \meta{E}
|
|
792 |
| ( \cdot \meta{E} \cdot ) | \meta{N}\\
|
|
793 |
: \meta{N} ::= \meta{N} \cdot \meta{N} |
|
|
794 |
0 | 1 | \ldots | 9\\ |
|
795 |
\end{plstx}}
|
|
| 49 | 796 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
797 |
Unfortunately it is left-recursive (and ambiguous).\medskip\\ |
| 597 | 798 |
A problem for \alert{recursive descent parsers} (e.g.~parser
|
799 |
combinators). \bigskip\pause |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
800 |
|
| 597 | 801 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
802 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
803 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
804 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
805 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
806 |
\begin{frame}[t]
|
| 597 | 807 |
\frametitle{Numbers}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
808 |
|
| 597 | 809 |
\bl{\begin{plstx}[margin=1cm]
|
810 |
: \meta{N} ::= \meta{N} \cdot \meta{N} |
|
|
811 |
0 | 1 | \ldots | 9\\ |
|
812 |
\end{plstx}}
|
|
| 49 | 813 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
814 |
A non-left-recursive, non-ambiguous grammar for numbers: |
| 49 | 815 |
|
| 597 | 816 |
\bl{\begin{plstx}[margin=1cm]
|
817 |
: \meta{N} ::= 0 \cdot \meta{N} | 1 \cdot \meta{N} | \ldots |
|
|
818 |
0 | 1 | \ldots | 9\\ |
|
819 |
\end{plstx}}
|
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
820 |
|
| 597 | 821 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
822 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
823 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
824 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
825 |
\begin{frame}[c]
|
| 597 | 826 |
\frametitle{Removing Left-Recursion}
|
|
295
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
827 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
828 |
The rule for numbers is directly left-recursive: |
| 49 | 829 |
|
830 |
\begin{center}
|
|
| 50 | 831 |
\bl{\begin{tabular}{lcl}
|
| 597 | 832 |
$\meta{N}$ & $::=$ & $\meta{N} \cdot \meta{N} \;|\; 0 \;|\; 1\;\;\;\;(\ldots)$
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
833 |
\end{tabular}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
834 |
\end{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
835 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
836 |
Translate |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
837 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
838 |
\begin{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
839 |
\begin{tabular}{ccc}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
840 |
\bl{\begin{tabular}{lcl}
|
| 597 | 841 |
$\meta{N}$ & $::=$ & $\meta{N} \cdot \alpha$\\
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
842 |
& $\;|\;$ & $\beta$\\ |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
843 |
\\ |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
844 |
\end{tabular}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
845 |
& {\Large$\Rightarrow$} &
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
846 |
\bl{\begin{tabular}{lcl}
|
| 597 | 847 |
$\meta{N}$ & $::=$ & $\beta \cdot \meta{N}'$\\
|
848 |
$\meta{N}'$ & $::=$ & $\alpha \cdot \meta{N}'$\\
|
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
849 |
& $\;|\;$ & $\epsilon$ |
| 50 | 850 |
\end{tabular}}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
851 |
\end{tabular}
|
| 50 | 852 |
\end{center}\pause
|
853 |
||
| 597 | 854 |
Which means in this case: |
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
855 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
856 |
\begin{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
857 |
\bl{\begin{tabular}{lcl}
|
| 597 | 858 |
$\meta{N}$ & $\rightarrow$ & $0 \cdot \meta{N}' \;|\; 1 \cdot \meta{N}'$\\
|
859 |
$\meta{N}'$ & $\rightarrow$ & $\meta{N} \cdot \meta{N}' \;|\; \epsilon$\\
|
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
860 |
\end{tabular}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
861 |
\end{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
862 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
863 |
|
| 597 | 864 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
865 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
866 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
867 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 685 | 868 |
%\begin{frame}[c]
|
869 |
%\frametitle{Operator Precedences}
|
|
870 |
% |
|
871 |
% |
|
872 |
%To disambiguate |
|
873 |
% |
|
874 |
%\begin{center}
|
|
875 |
%\bl{\begin{tabular}{lcl}
|
|
876 |
%$\meta{E}$ & $::=$ & $\meta{E} \cdot + \cdot \meta{E} \;|\;\meta{E} \cdot * \cdot \meta{E} \;|\;( \cdot \meta{E} \cdot ) \;|\;\meta{N}$ \\
|
|
877 |
%\end{tabular}}
|
|
878 |
%\end{center}
|
|
879 |
% |
|
880 |
%Decide on how many precedence levels, say\medskip\\ |
|
881 |
%highest for \bl{$()$}, medium for \bl{*}, lowest for \bl{+}
|
|
882 |
% |
|
883 |
%\begin{center}
|
|
884 |
%\bl{\begin{tabular}{lcl}
|
|
885 |
%$\meta{E}_{low}$ & $::=$ & $\meta{E}_{med} \cdot + \cdot \meta{E}_{low} \;|\; \meta{E}_{med}$ \\
|
|
886 |
%$\meta{E}_{med}$ & $::=$ & $\meta{E}_{hi} \cdot * \cdot \meta{E}_{med} \;|\; \meta{E}_{hi}$\\
|
|
887 |
%$\meta{E}_{hi}$ & $::=$ & $( \cdot \meta{E}_{low} \cdot ) \;|\;\meta{N}$ \\
|
|
888 |
%\end{tabular}}
|
|
889 |
%\end{center}\pause
|
|
890 |
% |
|
891 |
%\small What happens with \bl{$1 + 3 + 4$}?
|
|
892 |
%\end{frame}
|
|
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
893 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
894 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
895 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
896 |
\begin{frame}[c]
|
| 597 | 897 |
\frametitle{Chomsky Normal Form}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
898 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
899 |
All rules must be of the form |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
900 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
901 |
\begin{center}
|
| 597 | 902 |
\bl{$\meta{A} ::= a$}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
903 |
\end{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
904 |
|
| 50 | 905 |
or |
906 |
||
907 |
\begin{center}
|
|
| 597 | 908 |
\bl{$\meta{A} ::= \meta{B}\cdot \meta{C}$}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
909 |
\end{center}
|
| 49 | 910 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
911 |
No rule can contain \bl{$\epsilon$}.
|
| 49 | 912 |
|
| 597 | 913 |
\end{frame}
|
| 49 | 914 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
915 |
||
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
916 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
917 |
\begin{frame}[c]
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
918 |
\frametitle{\begin{tabular}{c}$\epsilon$-Removal\end{tabular}}
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
919 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
920 |
\begin{enumerate}
|
| 597 | 921 |
\item If \bl{$A::= \alpha \cdot B \cdot \beta$} and \bl{$B ::= \epsilon$} are in the grammar,
|
922 |
then add \bl{$A::= \alpha \cdot \beta$} (iterate if necessary).
|
|
923 |
\item Throw out all \bl{$B ::= \epsilon$}.
|
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
924 |
\end{enumerate}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
925 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
926 |
\small |
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
927 |
\begin{center}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
928 |
\begin{tabular}{ccc}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
929 |
\bl{\begin{tabular}{l@{\hspace{1mm}}c@{\hspace{1mm}}l}
|
| 597 | 930 |
$N$ & $::=$ & $0 \cdot N' \;|\; 1\cdot N'$\\ |
931 |
$N'$ & $::=$ & $N \cdot N'\;|\;\epsilon$\\ |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
932 |
\\ |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
933 |
\\ |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
934 |
\\ |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
935 |
\\ |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
936 |
\\ |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
937 |
\end{tabular}} &
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
938 |
\bl{\begin{tabular}{l@{\hspace{1mm}}c@{\hspace{1mm}}l}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
939 |
\\ |
| 597 | 940 |
$N$ & $::=$ & $0 \cdot N' \;|\; 1\cdot N'\;|\;0\;|\;1$\\ |
941 |
$N'$ & $::=$ & $N \cdot N'\;|\;N\;|\;\epsilon$\\ |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
942 |
\\ |
| 597 | 943 |
$N$ & $::=$ & $0 \cdot N' \;|\; 1\cdot N'\;|\;0\;|\;1$\\ |
944 |
$N'$ & $::=$ & $N \cdot N'\;|\;N$\\ |
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
945 |
\end{tabular}}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
946 |
\end{tabular}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
947 |
\end{center}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
948 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
949 |
\pause\normalsize |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
950 |
\begin{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
951 |
\bl{\begin{tabular}{l@{\hspace{1mm}}c@{\hspace{1mm}}l}
|
| 597 | 952 |
$N$ & $::=$ & $0 \cdot N\;|\; 1\cdot N\;|\;0\;|\;1$\\ |
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
953 |
\end{tabular}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
954 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
955 |
\end{center}
|
|
368
a9911966c0df
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
366
diff
changeset
|
956 |
\end{frame}
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
957 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
958 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
959 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
960 |
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
961 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
962 |
\begin{frame}[c]
|
| 597 | 963 |
\frametitle{CYK Algorithm}
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
964 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
965 |
If grammar is in Chomsky normalform \ldots |
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
966 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
967 |
\begin{center}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
968 |
\bl{\begin{tabular}{@ {}lcl@ {}}
|
| 597 | 969 |
$\meta{S}$ & $::=$ & $\meta{N}\cdot \meta{P}$ \\
|
970 |
$\meta{P}$ & $::=$ & $\meta{V}\cdot \meta{N}$ \\
|
|
971 |
$\meta{N}$ & $::=$ & $\meta{N}\cdot \meta{N}$ \\
|
|
972 |
$\meta{N}$ & $::=$ & $\texttt{students} \;|\; \texttt{Jeff} \;|\; \texttt{geometry} \;|\; \texttt{trains} $ \\
|
|
973 |
$\meta{V}$ & $::=$ & $\texttt{trains}$
|
|
| 49 | 974 |
\end{tabular}}
|
975 |
\end{center}
|
|
976 |
||
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
977 |
\bl{\texttt{Jeff trains geometry students}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
978 |
|
| 597 | 979 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
980 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 597 | 981 |
|
982 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
983 |
\begin{frame}[c]
|
| 597 | 984 |
\frametitle{CYK Algorithm}
|
| 49 | 985 |
|
986 |
||
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
987 |
\begin{itemize}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
988 |
\item fastest possible algorithm for recognition problem |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
989 |
\item runtime is \bl{$O(n^3)$}\bigskip
|
| 597 | 990 |
\item grammars need to be transformed into CNF |
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
991 |
\end{itemize}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
992 |
|
| 597 | 993 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
994 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
995 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
996 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
997 |
\begin{frame}[c]
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
998 |
\frametitle{The Goal of this Course}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
999 |
\mbox{}\\[-26mm]\mbox{}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1000 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1001 |
\begin{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1002 |
\begin{tikzpicture}[scale=1,
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1003 |
node/.style={
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1004 |
rectangle,rounded corners=3mm, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1005 |
very thick,draw=black!50, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1006 |
minimum height=18mm, minimum width=20mm, |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1007 |
top color=white,bottom color=black!20}] |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1008 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1009 |
\node at (3.05, 1.8) {\Large\bf Write a Compiler};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1010 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1011 |
\node (0) at (-2.3,0) {};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1012 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1013 |
\node (A) at (0,0) [node] {};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1014 |
\node [below right] at (A.north west) {lexer};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1015 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1016 |
\node (B) at (3,0) [node] {};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1017 |
\node [below right=1mm] at (B.north west) |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1018 |
{\mbox{}\hspace{-1mm}parser};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1019 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1020 |
\node (C) at (6,0) [node] {};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1021 |
\node [below right] at (C.north west) |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1022 |
{\mbox{}\hspace{-1mm}code gen};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1023 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1024 |
\node (1) at (8.4,0) {};
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1025 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1026 |
\draw [->,line width=4mm] (0) -- (A); |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1027 |
\draw [->,line width=4mm] (A) -- (B); |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1028 |
\draw [->,line width=4mm] (B) -- (C); |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1029 |
\draw [->,line width=4mm] (C) -- (1); |
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1030 |
\end{tikzpicture}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1031 |
\end{center}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1032 |
|
| 598 | 1033 |
We have a lexer and a parser\ldots |
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1034 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1035 |
\end{frame}
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1036 |
|
|
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1037 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1038 |
\begin{frame}[c]
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1039 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1040 |
\begin{center}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1041 |
\bl{\begin{tabular}{@{}lcl@{}}
|
| 598 | 1042 |
\meta{Stmt} & $::=$ & $\texttt{skip}$\\
|
1043 |
& $|$ & \textit{Id}\;\texttt{:=}\;\meta{AExp}\\
|
|
1044 |
& $|$ & \texttt{if}\; \meta{BExp} \;\texttt{then}\; \meta{Block} \;\texttt{else}\; \meta{Block}\\
|
|
1045 |
& $|$ & \texttt{while}\; \meta{BExp} \;\texttt{do}\; \meta{Block}\\
|
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1046 |
& $|$ & \texttt{read}\;\textit{Id}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1047 |
& $|$ & \texttt{write}\;\textit{Id}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1048 |
& $|$ & \texttt{write}\;\textit{String}\medskip\\
|
| 598 | 1049 |
\meta{Stmts} & $::=$ & \meta{Stmt} \;\texttt{;}\; \meta{Stmts}\\
|
1050 |
& $|$ & \meta{Stmt}\medskip\\
|
|
1051 |
\meta{Block} & $::=$ & \texttt{\{}\,\meta{Stmts}\,\texttt{\}}\\
|
|
1052 |
& $|$ & \meta{Stmt}\medskip\\
|
|
1053 |
\meta{AExp} & $::=$ & \ldots\\
|
|
1054 |
\meta{BExp} & $::=$ & \ldots\\
|
|
| 50 | 1055 |
\end{tabular}}
|
1056 |
\end{center}
|
|
|
366
5a83336a9690
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
365
diff
changeset
|
1057 |
\end{frame}
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1058 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1059 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1060 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1061 |
\mode<presentation>{
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1062 |
\begin{frame}[c]
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1063 |
|
| 744 | 1064 |
??%%\mbox{\lstinputlisting[language=while]{../progs/fib.while}}
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1065 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1066 |
\end{frame}}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1067 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1068 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1069 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1070 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1071 |
\begin{frame}[c]
|
| 598 | 1072 |
\frametitle{An Interpreter}
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1073 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1074 |
\begin{center}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1075 |
\bl{\begin{tabular}{l}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1076 |
$\{$\\
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1077 |
\;\;$x := 5 \text{;}$\\
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1078 |
\;\;$y := x * 3\text{;}$\\
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1079 |
\;\;$y := x * 4\text{;}$\\
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1080 |
\;\;$x := u * 3$\\ |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1081 |
$\}$ |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1082 |
\end{tabular}}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1083 |
\end{center}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1084 |
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1085 |
\begin{itemize}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1086 |
\item the interpreter has to record the value of \bl{$x$} before assigning a value to \bl{$y$}\pause
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1087 |
\item \bl{\text{eval}(stmt, env)}
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1088 |
\end{itemize}
|
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1089 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1090 |
|
| 598 | 1091 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1092 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1093 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1094 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1095 |
\begin{frame}[c]
|
| 598 | 1096 |
\frametitle{An Interpreter}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1097 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1098 |
\begin{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1099 |
\bl{\begin{tabular}{@{}lcl@{}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1100 |
$\text{eval}(n, E)$ & $\dn$ & $n$\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1101 |
$\text{eval}(x, E)$ & $\dn$ & $E(x)$ \;\;\;\textcolor{black}{lookup \bl{$x$} in \bl{$E$}}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1102 |
$\text{eval}(a_1 + a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) + \text{eval}(a_2, E)$\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1103 |
$\text{eval}(a_1 - a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) - \text{eval}(a_2, E)$\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1104 |
$\text{eval}(a_1 * a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) * \text{eval}(a_2, E)$\bigskip\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1105 |
$\text{eval}(a_1 = a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) = \text{eval}(a_2, E)$\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1106 |
$\text{eval}(a_1\,!\!= a_2, E)$ & $\dn$ & $\neg(\text{eval}(a_1, E) = \text{eval}(a_2, E))$\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1107 |
$\text{eval}(a_1 < a_2, E)$ & $\dn$ & $\text{eval}(a_1, E) < \text{eval}(a_2, E)$\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1108 |
\end{tabular}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1109 |
\end{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1110 |
|
| 598 | 1111 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1112 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 598 | 1113 |
|
1114 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1115 |
\begin{frame}[c]
|
| 598 | 1116 |
\frametitle{An Interpreter (2)}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1117 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1118 |
\begin{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1119 |
\bl{\begin{tabular}{@{}lcl@{}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1120 |
$\text{eval}(\text{skip}, E)$ & $\dn$ & $E$\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1121 |
$\text{eval}(x:=a, E)$ & $\dn$ & \bl{$E(x \mapsto \text{eval}(a, E))$}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1122 |
\multicolumn{3}{@{}l@{}}{$\text{eval}(\text{if}\;b\;\text{then}\;cs_1\;\text{else}\;cs_2 , E) \dn$}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1123 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\text{if}\;\text{eval}(b,E)\;\text{then}\;
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1124 |
\text{eval}(cs_1,E)$}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1125 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\phantom{\text{if}\;\text{eval}(b,E)\;}\text{else}\;\text{eval}(cs_2,E)$}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1126 |
\multicolumn{3}{@{}l@{}}{$\text{eval}(\text{while}\;b\;\text{do}\;cs, E) \dn$}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1127 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\text{if}\;\text{eval}(b,E)$}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1128 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\text{then}\;
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1129 |
\text{eval}(\text{while}\;b\;\text{do}\;cs, \text{eval}(cs,E))$}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1130 |
\multicolumn{3}{@{}l@{}}{\hspace{2cm}$\text{else}\; E$}\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1131 |
$\text{eval}(\text{write}\; x, E)$ & $\dn$ & $\{\;\text{println}(E(x))\; ;\;E\;\}$\\
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1132 |
\end{tabular}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1133 |
\end{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1134 |
|
| 598 | 1135 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1136 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1137 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1138 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1139 |
\begin{frame}[c]
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1140 |
\frametitle{\begin{tabular}{c}Test Program\end{tabular}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1141 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1142 |
\mbox{}\\[-18mm]\mbox{}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1143 |
|
| 744 | 1144 |
?? |
1145 |
%{\lstset{language=While}%%\fontsize{10}{12}\selectfont
|
|
1146 |
%\texttt{\lstinputlisting{../progs/loops.while}}}
|
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1147 |
|
|
295
19f23c4c2167
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
215
diff
changeset
|
1148 |
\end{frame}
|
|
169
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1149 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
57df3d7b4a25
added slides
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
168
diff
changeset
|
1150 |
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1151 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1152 |
\mode<presentation>{
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1153 |
\begin{frame}[t]
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1154 |
\frametitle{\begin{tabular}{c}Interpreted Code\end{tabular}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1155 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1156 |
\begin{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1157 |
\begin{tikzpicture}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1158 |
\begin{axis}[axis x line=bottom, axis y line=left, xlabel=n, ylabel=secs, legend style=small]
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1159 |
\addplot+[smooth] file {interpreted.data};
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1160 |
\end{axis}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1161 |
\end{tikzpicture}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1162 |
\end{center}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1163 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1164 |
\end{frame}}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1165 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1166 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1167 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1168 |
\begin{frame}[c]
|
| 685 | 1169 |
\frametitle{Java Virtual Machine}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1170 |
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1171 |
\begin{itemize}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1172 |
\item introduced in 1995 |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1173 |
\item is a stack-based VM (like Postscript, CLR of .Net) |
| 685 | 1174 |
\item contains a JIT compiler\\ |
1175 |
\begin{itemize}
|
|
1176 |
\item From the Cradle to the Holy Graal - the JDK Story |
|
1177 |
\item \url{https://www.youtube.com/watch?v=h419kfbLhUI}
|
|
1178 |
\end{itemize}
|
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1179 |
\item is garbage collected $\Rightarrow$ no buffer overflows |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1180 |
\item some languages compile to the JVM: Scala, Clojure\ldots |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1181 |
\end{itemize}
|
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1182 |
|
| 685 | 1183 |
\end{frame}
|
|
365
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1184 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
9b71dead1219
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
295
diff
changeset
|
1185 |
|
| 685 | 1186 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
1187 |
\begin{frame}[c]
|
|
1188 |
\frametitle{LLVM}
|
|
1189 |
||
1190 |
\begin{itemize}
|
|
1191 |
\item LLVM started by academics in 2000 (University of Illinois in |
|
1192 |
Urbana-Champaign) |
|
1193 |
\item suite of compiler tools |
|
1194 |
\item SSA-based intermediate language |
|
1195 |
\item no need to allocate registers |
|
| 686 | 1196 |
\item source languages: C, C++, Rust, Go, Swift |
1197 |
\item target CPUs: x86, ARM, PowerPC, \ldots |
|
| 685 | 1198 |
\end{itemize}
|
1199 |
\end{frame}
|
|
1200 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 702 | 1201 |
|
| 598 | 1202 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 666 | 1203 |
%\begin{frame}[c]
|
1204 |
% \frametitle{Coursework: MkEps}
|
|
1205 |
% |
|
1206 |
%\begin{center}
|
|
1207 |
%\begin{tabular}{@ {}l@ {\hspace{2mm}}c@ {\hspace{2mm}}l@ {}}
|
|
1208 |
% \bl{$mkeps([c_1 c_2 \ldots c_n])$} & \bl{$\dn$} & $\bl{undefined}$\\
|
|
1209 |
% \bl{$mkeps(r^*)$} & \bl{$\dn$} & $\bl{Stars\,[]}$\\
|
|
1210 |
% \bl{$mkeps(r^{\{n\}})$} & \bl{$\dn$} & $\bl{Stars\,(mkeps(r))^n}$\\
|
|
1211 |
% \bl{$mkeps(r^{\{n..\}})$} & \bl{$\dn$} & $\bl{Stars\,(mkeps(r))^n}$\\
|
|
1212 |
% \bl{$mkeps(r^{\{..n\}})$} & \bl{$\dn$} & $\bl{Stars\,[]}$\\
|
|
1213 |
% \bl{$mkeps(r^{\{n..m\}})$} & \bl{$\dn$} & $\bl{Stars\,(mkeps(r))^n}$\medskip\\
|
|
1214 |
% |
|
1215 |
% \bl{$mkeps(r^+)$} & \bl{$\dn$} & \bl{$mkeps(r^{\{1..\}})$}\\
|
|
1216 |
% \bl{$mkeps(r^?)$} & \bl{$\dn$} & \bl{$mkeps(r^{\{..1\}})$}\\
|
|
1217 |
%\end{tabular}
|
|
1218 |
%\end{center}
|
|
1219 |
% |
|
1220 |
%\end{frame}
|
|
1221 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
1222 |
% |
|
1223 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
1224 |
%\begin{frame}[c]
|
|
1225 |
% \frametitle{Coursework: Inj}
|
|
1226 |
% |
|
1227 |
%\begin{center}
|
|
1228 |
%\begin{tabular}{@ {}l@ {\hspace{2mm}}c@ {\hspace{2mm}}l@ {}}
|
|
1229 |
% \bl{$inj([c_1 c_2 \ldots c_n])\,c\,Empty$} & \bl{$\dn$} & $\bl{Chr\,c}$\\
|
|
1230 |
% \bl{$inj(r^*)\,c\;(Seq\,v\,(Stars\,vs))$} & \bl{$\dn$} & $\bl{Stars\,(inj\,r\,c\,v::vs)}$\\
|
|
1231 |
% \bl{$inj(r^{\{n\}})\,c\;(Seq\,v\,(Stars\,vs))$} & \bl{$\dn$} & $\bl{Stars\,(inj\,r\,c\,v::vs)}$\\
|
|
1232 |
% \bl{$inj(r^{\{n..\}})\,c\;(Seq\,v\,(Stars\,vs))$} & \bl{$\dn$} & $\bl{Stars\,(inj\,r\,c\,v::vs)}$\\
|
|
1233 |
% \bl{$inj(r^{\{..n\}})\,c\;(Seq\,v\,(Stars\,vs))$} & \bl{$\dn$} & $\bl{Stars\,(inj\,r\,c\,v::vs)}$\\
|
|
1234 |
% \bl{$inj(r^{\{n..m\}})\,c\;(Seq\,v\,(Stars\,vs))$} & \bl{$\dn$} & $\bl{Stars\,(inj\,r\,c\,v::vs)}$\medskip\\
|
|
1235 |
% |
|
1236 |
% \bl{$inj(r^+)\,c\,v$} & \bl{$\dn$} & \bl{$inj(r^{\{1..\}})\,c\,v$}\\
|
|
1237 |
% \bl{$inj(r^?)\,c\,v$} & \bl{$\dn$} & \bl{$inj(r^{\{..1\}})\,c\,v$}\\
|
|
1238 |
%\end{tabular}
|
|
1239 |
%\end{center}
|
|
1240 |
% |
|
1241 |
%\end{frame}
|
|
1242 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
| 702 | 1243 |
% |
| 598 | 1244 |
|
| 49 | 1245 |
\end{document}
|
1246 |
||
1247 |
%%% Local Variables: |
|
1248 |
%%% mode: latex |
|
1249 |
%%% TeX-master: t |
|
1250 |
%%% End: |
|
1251 |