Static Instrumenter breaks on invalid class files

Name: dkR10031 Date: 07/15/2003



Current implementation of the Static Instrumenter stops
processing a class files if it meets an empty class file.
As a result the tool can't instrument all class files in a
directory which contains the empty file.

Such behavior of the tool is incorrect because a user can't process
directories and jar files which contains files with '.class'
extensions and these files are not class files (current edition
of the Jcov User Guide does not prohibit it).

To reproduce the bug please execute the test below. This test
compiles the sources with jcov support, creates empty class file
'empty.class', tryes to instrument all class files in the current
directory using Static Instrumenter and finally tries to get properties of
the instrumented files to show that 'test' class has not the instrumented
version ("file with 'test.iclass' extension"):

-------------------------- test.java begin ---------------------------
public class test {

    public static void main(String[] args) {

        System.out.println("-----------");
        System.exit(0);
    }
}
-------------------------- test.java end -----------------------------
-------------------------- script begin ------------------------------
uname -a
export JCOV_JAR=/export/home/gary/QA.JCOV/ws-control/test.linux-x86/lib/jcov.jar
export TESTED_JAVA=/net/novo172/export/home/java/dest/jdk1.4.0-b92/linux-i386/bin/java
export TESTED_JAVAC=/net/novo172/export/home/java/dest/jdk1.4.0-b92/linux-i386/bin/javac
export CLASS_TPLGEN=com.sun.tdk.jcov.TmplGenMain
export CLASS_SINSTR=com.sun.tdk.jcov.InstrMain

CLASSPATH=${JCOV_JAR}
CLASSPATH=${CLASSPATH}:.
export CLASSPATH

# Compile the test program
$TESTED_JAVAC -Xjcov test.java
touch empty.class
$TESTED_JAVA -showversion $CLASS_SINSTR -verbose empty.class test.class

ls -l test.iclass
-------------------------- script end --------------------------------
-------------------------- script output begin -----------------------
Linux linux-11 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 i686 i386
GNU/Linux
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

instrumenting class file empty.class...*** Fatal error : Unexpected end of
class file :null
*** Exiting...
ls: test.iclass: No such file or directory
$ ./run.ksh
Linux linux-11 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 i686 i386
GNU/Linux
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

instrumenting class file empty.class...*** Fatal error : Unexpected end of class file :null
*** Exiting...
ls: test.iclass: No such file or directory
-------------------------- script output end -------------------------
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