upstream/mips/javaone.tex

   1 %
   2 % FIXME: - Add something about size limits on the constant pool
   3 %          how we worked around that and the performance impact
   4 %          of -o lessconstants
   5 %        - Add something about encoding data sections as string constants
   6 %          and the UTF8 non-7-bit-ascii penalty
   7 %
   8
   9 \documentclass[twocolumn]{article}
  10 \usepackage{amssymb,amsmath,epsfig}
  11 \setcounter{page}{1}
  12 \sloppy         % better line breaks
  13
  14 \def\twoauthors#1#2#3#4{\gdef\@address{}
  15    \gdef\@name{}}
  16
  17 \usepackage{palatino}
  18 \usepackage{parskip}
  19 \bibliographystyle{alpha}
  20
  21 \title{\textbf{\textsf{
  22 Running Legacy C/C++ Libraries in a Pure Java Environment
  23 }}}
  24 \date{}
  25 \author{\begin{tabular}{@{}c@{}}
  26         {\em {Adam Megacz}} \\ \\
  27         {The XWT Foundation}\relax
  28    \end{tabular}\hskip 1in\begin{tabular}{@{}c@{}}
  29         {\em {Brian Alliet}} \\ \\
  30         {{\it Affiliation Goes Here}}\relax
  31 \end{tabular}}
  32 \begin{document}
  33
  34 \maketitle
  35
  36 \begin{abstract}
  37 Abstract
  38 \end{abstract}
  39
  40 \section{Introduction}
  41
  42 \subsection{Why would you want to do this?}
  43
  44 \begin{itemize}
  45 \item applets
  46 \item untrusting servlet containers (mass hosting)
  47 \item unsure of deployment architecture
  48 \item JNI not available (ie J2ME)
  49 \item simplicity
  50 \item security against buffer overflows
  51 \item True WORA
  52 \end{itemize}
  53
  54
  55 \section{Existing Work: Source-to-Source Translation}
  56
  57 \section{Mips2Java: Binary-to-Binary Translation}
  58
  59 \subsection{Why MIPS?}
  60
  61 \subsection{Interpreter}
  62
  63 \subsection{Compiler}
  64
  65 \subsection{Advantages (over src2src)}
  66 \begin{itemize}
  67
  68 \item You get to use a {\it real} C/C++ compiler that's been tested
  69       for over a decade; it won't choke on flaky code.
  70
  71 \item You can keep your existing build scripts and source layout (just
  72       swap in the new compiler)
  73
  74 \item Zero post-translation tweaking means that you can change the
  75       library (fix bugs, fix security holes, upgrade) without having
  76       to remember what tweaks you made last time.
  77
  78 \end{itemize}
  79
  80
  81 \subsection{Virtualization}
  82 \begin{itemize}
  83 \item libc
  84 \item stdin/stdout
  85 \item arvg, argc
  86 \item syscalls
  87 \end{itemize}
  88
  89
  90 \section{Performance}
  91
  92 \subsection{Charts}
  93
  94 (Note that none of these libraries have pure-Java equivalents.)
  95
  96 \begin{itemize}
  97 \item libjpeg
  98 \item libfreetype
  99 \item libmspack
 100 \end{itemize}
 101
 102 \subsection{Optimizations}
 103
 104 \begin{itemize}
 105 \item trampoline
 106 \item optimal method size
 107 \item -msingle-float
 108 \item -mmemcpy
 109 \item fastmem
 110 \item local vars for registers (useless)
 111 \item -fno-rename-registers
 112 \item -ffast-math
 113 \item -fno-trapping-math
 114 \item -fsingle-precision-constant
 115 \item -mfused-madd
 116 \item -freg-struct-return
 117 \item -freduce-all-givs
 118 \item -fno-peephole
 119 \item -fno-peephole2
 120 \item -fmove-all-movables
 121 \item -fno-sched-spec-load
 122 \item -fno-sched-spec
 123 \item -fno-schedule-insns
 124 \item -fno-schedule-insns2
 125 \item -fno-delayed-branch
 126 \item -fno-function-cse
 127 \item -ffunction-sections
 128 \item -fdata-sections
 129 \item array bounds checking
 130 \item -falign-functions=n
 131 \item -falign-labels=n
 132 \item -falign-loops=n
 133 \item -falign-jumps=n
 134 \item -fno-function-cse
 135 \end{itemize}
 136
 137 \section{Future Directions}
 138
 139 \section{Conclusion}
 140
 141 \section{References}
 142
 143
 144 \end{document}
 145