appendix/bytecode.tex

   1 \documentclass[../thesis.tex]{subfiles}
   2
   3 \begin{document}
   4 \ifSubfilesClassLoaded{
   5         \pagenumbering{arabic}
   6 }{}
   7
   8 \chapter{Bytecode instruction set}%
   9 \label{chp:bytecode_instruction_set}
  10 \todo[inline]{formatting}
  11
  12 \begin{tabular}{ll}
  13         $l$ & label\\
  14         $w_r$ & return width\\
  15         $w_a$ & argument width\\
  16         $fp$ & frame pointer\\
  17         $sp$ & stack pointer\\
  18         $pc$ & program counter\\
  19 \end{tabular}
  20
  21 Bytecode is byte encoded, stack has 16-bit cells.
  22 Longs and reals are stored with the MSB first.
  23
  24 \footnotesize
  25 \begin{longtable}{lllll}
  26         \caption{\normalsize Semantics for the bytecode instructions\label{tbl:instr_task}}
  27         \endfirsthead%
  28         \caption{\normalsize Semantics for the bytecode instructions (cont.)}
  29         \endhead%
  30         \endfoot%
  31         \endlastfoot%
  32         \toprule
  33         Instr. & Args & Semantics & sp & pc\\
  34
  35         \midrule
  36         \texttt{return}   & $w_r~w_a$           & $st[fp\shortminus{}w_a\shortminus{}3+i] = st[fp+1]$ & $st[fp\shortminus{}w_a\shortminus{}3+w_r]$ & $st[fp\shortminus{}w_a\shortminus{}1]$\\
  37                                       &                     & {\bf for all} $i\in\{0..w_r\}$\\
  38                                       &                     & $fp = st[fp\shortminus{}w_a\shortminus{}2]$\\
  39         \texttt{jumpF}    & $l$                 & & $sp\shortminus{}1$ & $\left\{\begin{array}{ll} pc+1 & \textrm{\bf if } st[sp\shortminus{}1]\\l & \textrm{\bf otherwise}\end{array}\right.$\\
  40         \texttt{jump}     & $l$                 & & $sp\shortminus{}1$ & $l$\\
  41         \texttt{jumpSR}   & $w_a~l$             & $st[sp\shortminus{}w_a\shortminus{}1]=pc+2$ & & $l$\\
  42         \texttt{tailCall} & $w_{a_1}~w_{a_2}~l$ & $rotate\:(w_{a_1}+3+w_{a_2},w_{a_2})$         & $fp$             & $jl$\\
  43                                           &                     & $fp = fp-w_{a_1}+w_{a_2}$\\
  44                                           &                     & \multicolumn{3}{l}{{\bf where} $w_{a_1}$ is the width of the current function and $w_{a_2}$ the width of the called function}\\
  45         \texttt{arg}      & $i$                 & $st[sp] = st[fp-1-i]$ & $sp+1$\\
  46         \texttt{push}     & $n~b_0\ldots b_n$   & $st[sp+i] = s[i]$                             & $sp+n$           & $pc+2+n$\\
  47                                       &                     & {\bf for all} $i\in\{0..n\}$\\
  48 %       \midrule
  49         \texttt{pop}      & $n$                 & & $sp-n$           & $pc+2$\\
  50 %       \midrule
  51         \texttt{rot}      & $d~n$               & $rotate\:(d, n)$                              & $sp$             & $pc+3$\\
  52 %       \midrule
  53         \texttt{dup}      &                     & $st[sp] = st[sp-1]$                           & $sp+1$           & $pc+1$\\
  54 %       \midrule
  55         \texttt{pushPtrs} &                     & $st[sp] = sp$                                 & $sp+3$           & $pc+1$\\
  56                                           &                     & $st[sp+1] = fp$\\
  57                           &                     & $st[sp+2] = 0$\\
  58 %       \midrule
  59         \texttt{unOp}     &                     & $st[sp-1] = \diamond{}st[sp-1]$                & $sp$             & $pc+1$\\
  60                                           &                     & \multicolumn{3}{l}{{\bf for all} $\diamond\in\{\neg\}$}\\
  61 %       \midrule
  62         \texttt{binOp}    &                     & $st[sp-2] = st[sp-2] \mathbin{\oplus} st[sp-1]$         & $sp-1$           & $pc+1$\\
  63                                           &                     & \multicolumn{3}{l}{{\bf for all} $\oplus\in\{+, -, *, /, \wedge, \vee, \equiv, \not\equiv, \leq, \geq, <, >\}$}\\
  64 %       \midrule
  65         \texttt{mkTask}   & \texttt{Stable\textsubscript{n}} & $st[sp-n-1] = node (stable,$              & $sp-n+1$ & $pc+2$\\
  66                                           &                                  & $\qquad\qquad st[sp-1], \ldots, st[sp-n-1])$\\
  67         \texttt{mkTask}   & \texttt{Unstable\textsubscript{n}} & $st[sp-n-1] = node (unstable,$          & $sp-n+1$ & $pc+2$\\
  68                                           &                                  & $\qquad\qquad st[sp-1], \ldots, st[sp-n-1])$\\
  69 %       \midrule
  70 %                  & \multicolumn{3}{l}{Unstable\textsubscript{n}} & st[sp-n-1] = node (unstable,          & sp-n+1 & pc+2\\
  71 %              & \multicolumn{3}{l}{} & \qquad\qquad st[sp-1], \textrm{\ldots}, st[sp-n-1])\\
  72 %       \midrule
  73 %
  74 %              & \multicolumn{3}{l}{ReadD        } & st[sp-1] \ \ = node (readd, st[sp-1])             &        & pc+2\\
  75 %       \midrule
  76 %              & \multicolumn{3}{l}{ReadA        } & st[sp-1] \ \ = node (reada, st[sp-1])             &        & pc+2\\
  77 %       \midrule
  78 %              & \multicolumn{3}{l}{Repeat       } & st[sp-1] \ \ = node (repeat, st[sp-1])              &        & pc+2\\
  79 %       \midrule
  80 %              & \multicolumn{3}{l}{Delay        } & st[sp-1] \ \ = node (delay, st[sp-1])             &        & pc+2\\
  81 %       \midrule
  82 %
  83 %              & \multicolumn{3}{l}{WriteD       } & st[sp-2] \ \ = node (writed, st[sp-1], st[sp-2])  & sp-1   & pc+2\\
  84 %       \midrule
  85 %              & \multicolumn{3}{l}{WriteA       } & st[sp-2] \ \ = node (writea, st[sp-1], st[sp-2])  & sp-1   & pc+2\\
  86 %       \midrule
  87 %              & \multicolumn{3}{l}{And          } & st[sp-2] \ \ = node (and, st[sp-1], st[sp-2])     & sp-1   & pc+2\\
  88 %       \midrule
  89 %              & \multicolumn{3}{l}{Or           } & st[sp-2] \ \ = node (or, st[sp-1], st[sp-2])      & sp-1   & pc+2\\
  90 %       \midrule
  91 %
  92 %              & \multicolumn{3}{l}{SdsSet i     } & st[sp-1] \ \ = node (sdsset,i, st[sp-1])          &        & pc+3\\
  93 %       \midrule
  94 %
  95 %              & \multicolumn{3}{l}{SdsGet i     } & st[sp]\ \ \ \ \ = node (sdsget, i)                & sp+1   & pc+3\\
  96 %       \midrule
  97 %              & \multicolumn{3}{l}{DHTTemp i    } & st[sp-1] \ \ = node (dhttemp, i)                  & sp+1   & pc+3\\
  98 %       \midrule
  99 %              & \multicolumn{3}{l}{DHTHumid i   } & st[sp-1] \ \ = node (dhthumid, i)                 & sp+1   & pc+3\\
 100 %       \midrule
 101 %
 102 %              & \multicolumn{3}{l}{Step aw jl   } & st[sp-1] \ \ = node (step, aw, jl, st[sp-1])      & sp-1   & pc+5\\
 103         \bottomrule
 104 \end{longtable}
 105
 106 \input{subfilepostamble}
 107 \end{document}