JavaME Connected Device Configure

JavaME Connected Device Configure

Development Environment and Garbage Collector of Virtual Machine

Speaker: Chu, Hua-Rong Advisor: Chung Yung

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OUTLINE

• CDC implementation overview• Build Sun CDC1.0.1 in Ubuntu• What happens during the build process• Garbage Collector of Sun CVM

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IMPLEMENTATION OVERVIEWJavaME CDC

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CDC platform Survey

• IBM– WebSphere Everyplace Micro Environment– Support CDC1.1– Ref: 劉惠玲 , 嵌入式系統裝置走向跨平台的推手 - IBM J9, 2007 IBM developerWorks （ ~/cdc/CDC

doc/IBMJ9.ppt ）

• Sun – Offical CDC– Mobile & Embedded Community: phoneME Advanced

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Sun CDC History

Personal Java (1999)

JavaME CDC1.0 (2001)

JavaME CDC1.1 (2005)

JavaSE for Embedded? (2007)

phoneME Advanced(2008)

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Sun CDC family

• JavaME CDC1.0 (based on JavaSE1.3)• JavaME CDC1.0.1 (based on JavaSE1.3.1)• JavaME CDC1.1 (based on JavaSE1.4)– ARM, PowerPC, MIPS, SPARC, x86 (interpreter

only)– Linux, Solaris, Darwin, Win32

• phoneME Advanced MR2 (2008)– ARM, x86– Linux, Windows Mobile, OpenWRT

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BUILD SUN CDC 1.0.1 JavaME CDC

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PartI: Source Code

• Source Code: – j2me_cdcfp-1_0_1-fcs-src-b12-linux-i686-

14_May_2002.zip– Download: http://jtrue.pl/files/GPS/

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PartII: Environment

• Redhat7.1 / Ubuntu 6.06• JDK1.3 / JDK1.4 • egcs6 / gcc3.3 and related C develop tool• ksh

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PartIII: Troubleshooting

• Problem: This Version's java code is based on JavaSE 1.3.1.

• Java Compile time error:

• JDK6 javac with option -source 1.4/1.3 is no use• Solution ： downgrade to JDK1.4/1.3

../../src/share/classes/java/lang/SecurityManager.java:299: cannot find symbolsymbol : method initCause(java.lang.ClassNotFoundException)location: class java.lang.NoClassDefFoundError synchronized(SecurityManager.class) { ^

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• Problem: GCC4 is restricted for nonstandard C code in this Version.

• C Compile time error:

complie time Error:Checking for test classes to compile ...... ../../build/linux-i686/obj/globals.o../../src/share/javavm/runtime/globals.c:121:1: 錯誤：粘貼「 . 」和「 nullClassLoaderLock 」不能給出一個有效的預先處理識別字

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• Solution ： use GCC3.3(gcc -V3.3 if gcc4 is installed)

change line 117 of /cdcfoundation/src/share/javavm/runtime/globals.c from#define CVM_SYSMUTEX_ENTRY(mutex, name) {&CVMglobals.##mutex, name}#define CVM_SYSMUTEX_ENTRY(mutex, name) {&CVMglobals. mutex, name}

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• Problem: glibc <2.2 is needed in this Version• Linking Time Error:

Linking ../../build/linux-i686/bin/cvm../../build/linux-i686/obj/UNIXProcess_md.o ：在函式「 sigchld_handler 」中:../../src/linux/native/java/lang/UNIXProcess_md.c:213: 未定義參考到「__libc_wait 」collect2: ld 回傳 1make: *** [../../build/linux-i686/bin/cvm] Error 1

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• Solution: patch ~/src/linux/native/java/lang/UNIXProcess_md.c

34,53c34< < /* following lines Hacked by Kent Hulick based on< * ftp://people.redhat.com/drepper/libcwait.c< * fixes a broken calls to a removed glibc function:*/< #include < #include < pid_t __libc_wait (int *status)< {< int res;< asm volatile ("pushl %%ebx\n\t"< "movl %2, %%ebx\n\t"< "movl %1, %%eax\n\t"< "int $0x80\n\t"< "popl %%ebx"< : "=a" (res)< : "i" (__NR_wait4), "0" (WAIT_ANY), "c" (status), "d" (0),< "S" (0));< return res;< }< --

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PartIV: Preperation&Configure

#sudo su#cd /usr/local/src#wget http://jtrue.pl/files/GPS/j2me_cdcfp-

1_0_1-fcs-src-b12-linux-i686-14_May_2002.zip#unzip j2me_cdcfp-1_0_1-fcs-src-b12-linux-i686-

14_May_2002.zip#unzip cdcfoundation-1_0_1-fcs-src.zip#cd cdcfoundation/build

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Edit Makefile ./linux/defs.mk :

./linux/defs.mk:#petertc1026

./linux/defs.mk-#CFLAGS_SPEED = -c $(CC_ARCH_FLAGS) $(CCFLAGS) $(CCFLAGS_SPEED) $(CPPFLAGS)

./linux/defs.mk-#CFLAGS_SPACE = -c $(CC_ARCH_FLAGS) $(CCFLAGS) $(CCFLAGS_SPACE) $(CPPFLAGS)

./linux/defs.mk-#SO_CFLAGS = -c $(SO_CC_ARCH_FLAGS) $(CCFLAGS) $(CPPFLAGS)

./linux/defs.mk-CFLAGS_SPEED = -V3.3 -c $(CC_ARCH_FLAGS) $(CCFLAGS) $(CCFLAGS_SPEED) $(CPPFLAGS)

./linux/defs.mk-CFLAGS_SPACE = -V3.3 -c $(CC_ARCH_FLAGS) $(CCFLAGS) $(CCFLAGS_SPACE) $(CPPFLAGS)

./linux/defs.mk-SO_CFLAGS = -V3.3 -c $(SO_CC_ARCH_FLAGS) $(CCFLAGS) $(CPPFLAGS)

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Edit Makefile ./share/defs.mk :

./share/defs.mk:#petertc1026

./share/defs.mk-#CVM_GNU_TOOLS_PATH=/micro/tools/i686-redhat-linux/gnu/bin

./share/defs.mk-CVM_GNU_TOOLS_PATH=/usr/bin

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Patch /usr/local/src/cdcfoundation/src/share/javavm/runtime/globals.c:117

//petertc1026/*#define CVM_SYSMUTEX_ENTRY(mutex, name) {&CVMglobals.##mutex, name}*/

#define CVM_SYSMUTEX_ENTRY(mutex, name) {&CVMglobals. mutex, name}

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Patch /usr/local/src/cdcfoundation/src/linux/native/java/lang/UNIXProcess_md.c:213

34,53c34< < /* following lines Hacked by Kent Hulick based on< * ftp://people.redhat.com/drepper/libcwait.c< * fixes a broken calls to a removed glibc function:*/< #include <errno.h>< #include <sys/syscall.h>< pid_t __libc_wait (int *status)< {< int res;< asm volatile ("pushl %%ebx\n\t"< "movl %2, %%ebx\n\t"< "movl %1, %%eax\n\t"< "int $0x80\n\t"< "popl %%ebx"< : "=a" (res)< : "i" (__NR_wait4), "0" (WAIT_ANY), "c" (status), "d" (0),< "S" (0));< return res;< }<

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PartV: Build

#cd linux-i686#make CVM_DEBUG=true

JAVABIN=/usr/java/j2sdk1.4.2_18/bin

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PartVI: Demo# bin/cvm -Djava.class.path=testclasses.zip HelloWorld

> GC[SS]: Initialized semi-space gen for generational GC> Size of *each* semispace in bytes=1048576> Limits of generation = [0xb7942200,0xb7b42200)> First semispace = [0xb7942200,0xb7a42200)> Second semispace = [0xb7a42200,0xb7b42200)> GC[MC]: Initialized mark-compact gen for generational GC> Size of the space in bytes=3145728> Limits of generation = [0xb7b42200,0xb7e42200)> GC[generational]: Auxiliary data structures> heapBaseMemoryArea=[0xb7942008,0xb7e42208)> cardTable=[0x8322f90,0x8325790)> objectHeaderTable=[0x8325798,0x8327f98)> summaryTable=[0x8327fa0,0x8331fa0)> Hello world.

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WHAT HAPPENS DURING THE BUILD PROCESS

JavaME CDC

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Step Utility Input Output

1 javac src/share/classes/*.java build/target_name/btclasses/*.class

2 JavaMemberDepend

build/target_name/btclasses/*.class

build/target_name/generated/javavm/runtime/tranlist.

3 zip build/target_name/generated/javavm/runtime/tranlist

build/target_name/btclasses.zip

4 javac src/share/javavm/test/*.java (Runtime classes CVM test files )

build/target_name/lib/cdc.jar build/target_name/lib/foundation.jar build/target_name/testclasses/*.class

5 zip build/target_name/testclasses/*.class

build/target_name/testclasses.zip

6 javah Runtime classes JNI header files in build/target_name/generated/jni/*.h

7 JavaCodeCompact

build/target_name/btclasses.zip JNI header files in build/target_name/generated/jni/*.hPreloaded class data structuresin build/target_name/generated/javavm/runtime/romjava*.c and romjava.h Additional C file interfaces.

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Step Utility Input Output

8 C compiler Native methods and CVMsource (.c) files

Object files in build/target_name/obj/*.o

9 C compiler Preloaded classes in build/target_name/generated/javavm/runtime/romjava*.c

Object files in build/target_name/obj/romjava*.o

A archive utility

Object files in build/target_name/obj/romjava*.o

Object archive file in build/target_name/obj/libromjava.a

B linker Object files in build/target_name/obj/*.o from step 8

Object archive file in build/target_name/obj/libromjava.a from step 10

Virtual machine binary* in build/target_name/bin.

In build/linux-i686/directory• bin/cvm: executable image• lib/cdc.jar: JAR archive, default boot class path• testclasses.zip: a collection of simple tests

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GARBAGE COLLECTORJavaME CDC

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Build Options

• -CVM_GCCHOICE (Generational/marksweep/semispace)

• default: generational • Example:– -CVM_GCCHOICE=semispace

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Runtime Options

• -Xgc:gc_specific_options(In generational is youngGen=nnn in bytes)

• Default: 1M

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Runtime Options

• -Xmssize (memory allocation pool)• Default: 4M• Example: – -Xms6291456– -Xms6144k– -Xms6m

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Source Organization

• src/share/javavm/include/gc_common.h The shared GC interface.

• src/share/javavm/include/gc/gc_impl.hThe gcimpl GC interface that has to be implemented for each GC.

• src/share/javavm/include/gc/<gcname>/gc_config.h The configuration file for a specific GC.

• src/share/javavm/runtime/gc/<gcname>/gc_impl.c The implementation file for a specific GC.

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Execution Flow1. CVM allocates memory using the shared routine CVMgcAllocNewInstance().

2. CVMgcAllocNewInstance() does some processing and calls the GC-specific CVMgcimplAllocObject() to allocate the actual space for the object.

3. CVMgcimplAllocObject() performs the GC and calls the shared routine CVMgcStopTheWorldAndGC() to stop all threads at GC-safe points.

4. CVMgcStopTheWorldAndGC() ensures that all threads rendezvous at GC-safe points. When that is done, it calls the GC implementation CVMgcimplDoGC() to perform the GC action.

5. CVMgcimplDoGC() may call shared GC service routines to scan GC state: For example, CVMgcScanRoots() to scan all roots or CVMobjectWalkRefs() to scan the pointers in a given object or array.

6. When CVMgcimplDoGC() returns, all threads that were stopped at GC points resume execution. Eventually, CVMgcAllocNewInstance() returns and the thread that originally initiated GC resumes execution.

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REFERENCEJavaME CDC

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CDCFOUNDATION_PORTING_GUIDE.PDF

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