Building java VM

[mladen]

JamVM is a new Java Virtual Machine which conforms to the JVM specification version 2 (blue book). In comparison to most other VM's (free and commercial) it is extremely small. Last available JamVM version in OpenEmbedded repository is 1.5.3, but we want to build last available version which is 1.5.4. Jamvm version is obtained at distribution level and it’s impossible to provide it at local configuration level. That’s why we will make our copy of distribution. Next few commands will copy all necessary files

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mkdir –p /angstrom/sources/local/conf/distro/include
cp /angstrom/sources/openembedded/conf/distro/angstrom-2008.1.conf /angstrom/sources/local/conf/distro/
cp /angstrom/sources/openembedded/conf/distro/include/angstrom-2008-preferred-versions.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/angstrom-codec-engine-latest-preferred-versions.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/angstrom-glibc.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/angstrom.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/angstrom-jalimo.conf /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/angstrom-ldflags.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/angstrom-package-ipk.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/arm-thumb.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/glibc-internal.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/preferred-opie-versions-1.2.4.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/sane-toolchain-java.inc /angstrom/sources/local/conf/distro/include/
cp /angstrom/sources/openembedded/conf/distro/include/toolchain-internal.inc /angstrom/sources/local/conf/distro/include/

Edit file

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nano /angstrom/sources/local/conf/distro/include/angstrom-jalimo.conf

and change the content of file with the following

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# Put a 'require conf/distro/include/angstrom-jalimo.conf' in your local.conf if you want to build from the jalimo overlay

# initial stuff
PREFERRED_VERSION_jamvm-initial = "1.4.5"
PREFERRED_VERSION_classpath-initial = "0.93"

# Native VM
# Cacao native
#PREFERRED_PROVIDER_virtual/java-native ?= "cacao-native"
#SRCREV_pn-cacao-native ?= "c7bf150bfa46"
#PREFERRED_VERSION_cacao-native = "0.99.3"

# Classpath native
PREFERRED_VERSION_classpath-native = "0.98"

# JamVM native
PREFERRED_PROVIDER_virtual/java-native ?= "jamvm-native"
PREFERRED_VERSION_jamvm-native = "1.5.4"

# Native compiler settings
PREFERRED_PROVIDER_virtual/javac-native = "ecj-bootstrap-native"
PREFERRED_VERSION_libecj-bootstrap = "3.6"

# Target VM
PREFERRED_VERSION_cacao = "0.99.3"
PREFERRED_VERSION_cacaoh-native = "0.99.3"

PREFERRED_VERSION_jamvm = "1.5.4"
PREFERRED_PROVIDER_swt3.4-gtk = "swt3.4-gtk"
PREFERRED_PROVIDER_classpath = "classpath"

PREFERRED_VERSION_openjdk-6-jre = "6b18-1.8.5"
PREFERRED_VERSION_icedtea6-native = "1.7.10"

# Stage JAR files not into ARCH related dirs
STAGING_DIR_JAVA = "${STAGING_DIR}/java"
STAGING_DATADIR_JAVA ?= "${STAGING_DIR_JAVA}"

We are going to copy Jamvm recipe from OpenEmbedded repository

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mkdir –p /angstrom/sources/local/recipes/
cp –R /angstrom/sources/openembedded/recipes/jamvm /angstrom/sources/local/recipes

Next we have to create recipe for latest JamVM version by typing

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nano /angstrom/sources/local/recipes/jamvm /jamvm_1.5.4.bb

and finally add the following in file

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require jamvm.inc

SRC_URI += "file://debian-jni.patch;striplevel=0"

PR = "r3"

do_configure_prepend() {
  # Replaces the placeholder OE_LIBDIR_JNI with the JNI library directory
  # configured in OE.
  sed -i -e "s|OE_LIBDIR_JNI|${libdir_jni}|" src/dll.c
}

SRC_URI[md5sum] = "7654e9657691f5f09c4f481ed4686176"
SRC_URI[sha256sum] = "7865693698bc4322cabe1014a4b7ebdec1bc1daf45f1a4457b6e908a4446b124"

If JamVM have to be build without GUI support, edit file

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nano /angstrom/sources/local/recipes/jamvm /jamvm.inc

and change the lines

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EXTRA_OECONF = "--with-classpath-install-dir=${prefix} --libdir=${libdir}/jamvm"
CFLAGS += "-DDEFAULT_MAX_HEAP=16*MB"

with this one

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EXTRA_OECONF = "--without-x --without-alsa --disable-gtk-peer --disable-gconf-peer --disable-examples --with-classpath-install-dir=${prefix} --libdir=${libdir}/jamvm"
CFLAGS += "-DDEFAULT_MAX_HEAP=8*MB"

Everything about JamVM is now configured, so you can build it by

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bitbake jamvm