Ja(va) By(tecode) In(terpreter) (in) Ja(va)

My BSc thesis work for Eötvös Loránd University's Computer Science curriculum

Prerequisities

• Code:

  • JDK17
  • Maven 3.9.0

• Thesis:

  Arch Linux

  • biber
  • ghostscript
  • pgf-umlcd
  • texlive-bibtexextra
  • texlive-full
  Debian / Ubuntu

  • biber
  • ghostscript
  • texlive-bibtex-extra
  • texlive-font-utils
  • texlive-lang-european
  • texlive-latex-base
  • texlive-pictures
  • texlive-science
  MacOS

  • biber
  • ghostscript
  • texlive
  Other distros

  Find the closest matching packages, or install the whole of latex from the official source

  • Remove existing installation:

    rm -rf /usr/local/texlive/20*
    rm -rf ~/.texlive20*

  • Create a folder for texlive:

    sudo mkdir -p /usr/local/texlive/$(date +%Y)
    sudo chown -R "$USER" /usr/local/texlive

  • Install from the official source:

    mkdir /tmp/texlive
    cd /tmp/texlive
    wget http://mirror.ctan.org/systems/texlive/tlnet/install-tl.zip
    unzip ./install-tl.zip -d install-tl
    cd install-tl/install-tl-$(date +%Y%m%d)
    perl ./install-tl

    Once in perl console, enter i

  • Set variables:

    export MANPATH="$MANPATH:/usr/local/texlive/$(date +%Y)/texmf-dist/doc/man"
    export INFOPATH="$INFOPATH:/usr/local/texlive/$(date +%Y)/texmf-dist/doc/info"
    export PATH=/usr/local/texlive/$(date +%Y)/bin/x86_64-linux:$PATH

  TeX Packages

  Only install if on MacOS / there is an error in generating the pdf

  • adjustbox
  • algpseudocode
  • amsfonts
  • amsmath
  • amsthm
  • array
  • listingsutf8
  • longtable
  • makecell
  • minted
  • multirow
  • paralist
  • pgf-umlcd
  • rotating
  • subcaption
  • todonotes

  $ tlmgr install adjustbox algpseudocode amsfonts \
          amsmath amsthm array listingsutf8 longtable \
          makecell minted multirow paralist pgf-umlcd \
          rotating subcaption todonotes

• Other:

  • Just (optional - for use with justfile)

Building the code

Normally:

$ mvn package
$ java -jar target/jabyinja-*.jar <optional class file>

With Just:

$ just co
$ java -jar target/jabyinja-*.jar <optional class file>

Generating a PDF from the thesis

Ignore any warnings

Normally:

$ cd thesis/
$ pdflatex thesis.tex
$ bibtex thesis
$ pdflatex thesis.tex
$ pdflatex thesis.tex

With Just:

$ just t

Usage

Without specifying any files, the program will try to interpret Main.class, located in the same directory as from where you ran the program from. If you do intend to specifcy a given file, do it with a single argument, where you name the .class file (i.e. if your file is named Example.class, you write Example.class NOT Example)

Number precision

Jabyinja

	BYTE	SHORT	INTEGER	LONG	FLOAT	DOUBLE
MAX	127	32767	2147483647	9223372036854775807	3.4028235E38	1.7976931348623157E308
MIN	-128	-32768	-2147483648	-9223372036854775808	1.4E-45	4.9E-324
0xCA	-54	-54	-54	-54
0xFE	-2	-2	-2	-2
0xBA	-70	-70	-70	-70
0xBE	-66	-66	-66	-66
0xCAFE	-2	-13570	-13570	-13570
0xBABE	-66	-17730	-17730	-17730
0xCAFEBABE	-66	-17730	-889275714	-889275714
0xCAFEBABECAFEBABE	-66	-17730	-889275714	-3819410105351357762
PI (6)					3.141592	3.141592
PI (7)					3.1415925	3.1415926
PI (6) ^ 2					9.8696	9.869600294464002
PI (6) ^ 3					31.006258	31.006257328285756
PI (15)					3.1415927	3.141592653589793
PI (16)					3.1415927	3.141592653589793
PI (15) ^ 2					9.869605	9.869604401089358
PI (15) ^ 3					31.006279	31.006276680299816

/usr/bin/java

	BYTE	SHORT	INTEGER	LONG	FLOAT	DOUBLE
MAX	127	32767	2147483647	9223372036854775807	3.4028235E38	1.7976931348623157E308
MIN	-128	-32768	-2147483648	-9223372036854775808	1.4E-45	4.9E-324
0xCA	-54	-54	-54	-54
0xFE	-2	-2	-2	-2
0xBA	-70	-70	-70	-70
0xBE	-66	-66	-66	-66
0xCAFE	-2	-13570	-13570	-13570
0xBABE	-66	-17730	-17730	-17730
0xCAFEBABE	-66	-17730	-889275714	-889275714
0xCAFEBABECAFEBABE	-66	-17730	-889275714	-3819410105351357762
PI (6)					3.141592	3.141592
PI (7)					3.1415925	3.1415926
PI (6) ^ 2					9.8696	9.869600294464002
PI (6) ^ 3					31.006258	31.006257328285756
PI (15)					3.1415927	3.141592653589793
PI (16)					3.1415927	3.141592653589793
PI (15) ^ 2					9.869605	9.869604401089358
PI (15) ^ 3					31.006279	31.006276680299816

Thankfully, they are the exact same

JVM Instructions checklist

OPCODE	IMPLEMENTED?
NOP
ACONST_NULL
ICONST_*
LCONST_*
FCONST_*
DCONST_*
BIPUSH
SIPUSH
LDC*
ILOAD*
LLOAD*
FLOAD*
DLOAD*
ALOAD*
IALOAD
LALOAD
FALOAD
DALOAD
AALOAD
BALOAD
CALOAD
SALOAD
ISTORE*
LSTORE*
FSTORE*
DSTORE*
ASTORE*
IASTORE
LASTORE
FASTORE
DASTORE
AASTORE
BASTORE
CASTORE
SASTORE
POP*
DUP*
DUP2*
SWAP
*ADD
*SUB
*MUL
*DIV
*REM
*NEG
*SHL
*SHR
*USHR
*AND
*OR
*XOR
IINC
I2*
L2*
F2*
D2*
LCMP
FCMP*
DCMP*
IF*
GOTO
JSR
RET
TABLESWITCH
LOOKUPSWITCH
*RETURN
*STATIC
*FIELD
INVOKE*
INVOKEDYNAMIC
NEW
NEWARRAY
ANEWARRAY
ARRAYLENGTH
ATHROW
CHECKCAST
INSTANCEOF
MONITOR*
WIDE
MULTIANEWARRAY
IF*NULL
GOTO_W
JSR_W