JamVM - Bootstrapping OpenJDK using JamVM.

[Xerxes Rånby]

On 2011-02-22 16:40, Robert Lougher wrote:
>> I have started looking into if it is possible to bootstrap OpenJDK using JamVM itself.
>> http://icedtea.classpath.org/hg/icedtea6/rev/18260ff5be1d
>>
>> ./autogen.sh
>> ./configure --enable-jamvm
>> make
>>
>> When testing to perform a full bootstrap build then I am hitting a internal JamVM error when running ANT:
>>
>> JAVA_HOME=/home/xerxes/icedtea6-jamvm/bootstrap/jdk1.6.0 ANT_OPTS=-Djava.io.tmpdir='/home/xerxes/icedtea6-jamvm/openjdk.build/langtools/build/ant-tmp' /usr/bin/ant -diagnostics > /home/xerxes/icedtea6-jamvm/openjdk.build/langtools/build/ant-diagnostics.log ; \
>>      JAVA_HOME=/home/xerxes/icedtea6-jamvm/bootstrap/jdk1.6.0 ANT_OPTS=-Djava.io.tmpdir='/home/xerxes/icedtea6-jamvm/openjdk.build/langtools/build/ant-tmp' /usr/bin/ant -version >> /home/xerxes/icedtea6-jamvm/openjdk.build/langtools/build/ant-diagnostics.log
>> bootclasspath is empty!
>> bootclasspath is empty!
>>
>> I assume that JamVM itself needs to be patched to work with the large flora of bootclasspaths used by the OpenJDK build.
>>
> Hi Xerxes,
>
> I know why this happens.  JAVA_HOME overrides the value of java.home,
> and is a hangover from GNU Classpath (somebody requested it, I can't
> remember who, when or why!).  On the JDK, java.home points to the jre
> dir, and is not the same as JAVA_HOME.
>
> To test, you can comment out the lines in properties.c as follows:
>
>   52 void setJavaHome() {
>   53     java_home = getCommandLineProperty("java.home");
>   54
>   55 //    if(java_home == NULL)
>   56 //        java_home = getenv("JAVA_HOME");
>   57
>   58     if(java_home == NULL)
>   59         java_home = classlibDefaultJavaHome();
>   60 }
>
> I'll check the fix in tonight.
>
> Rob.
>

This fix made ANT happy!

The bootstrap build now continue untill JamVM encounter two unsupported -XX: jvm options: -J-XX:PermSize=32m and -J-XX:MaxPermSize=160m

>>>Recursively making crypto all @ Tue Feb 22 16:54:30 CET 2011 ...
make[6]: Entering directory `/home/xerxes/icedtea6-jamvm/openjdk-ecj/jdk/make/javax/crypto'
rm -f -r  /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/classes/javax/crypto  /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/classes/sun/security/internal/interfaces  /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/classes/sun/security/internal/spec
/bin/mkdir -p /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/tmp/sun/javax.crypto/unsigned
rm -f /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/tmp/sun/javax.crypto/unsigned/jce.jar
/home/xerxes/icedtea6-jamvm/bootstrap/jdk1.6.0/bin/jar cmf /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/tmp/sun/javax.crypto/manifest.mf /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/tmp/sun/javax.crypto/unsigned/jce.jar  -C /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/tmp/sun/javax.crypto/classes javax/crypto  -C /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/tmp/sun/javax.crypto/classes sun/security/internal/interfaces  -C /home/xerxes/icedtea6-jamvm/openjdk.build-ecj/tmp/sun/javax.crypto/classes sun/security/internal/spec \
        -J-client -J-Xmx896m -J-Xms128m -J-XX:PermSize=32m -J-XX:MaxPermSize=160m
Could not create the Java virtual machine.
make[6]: *** [/home/xerxes/icedtea6-jamvm/openjdk.build-ecj/tmp/sun/javax.crypto/unsigned/jce.jar] Error 1

>> xerxes at xerxes-J464X:~/icedtea6-jamvm$ /home/xerxes/icedtea6-jamvm/bootstrap/jdk1.6.0/bin/java -version
>> java version "1.6.0_21"
>> IcedTea6 Runtime Environment (1.10pre+r18260ff5be1d) (Ubuntu build 1.6.0_21-b21)
>> JamVM (build 1.6.0-devel, inline-threaded interpreter with stack-caching)
>>
>> Cheers
>> Xerxes
>>