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  1. Code Tools
  2. CODETOOLS-7900407

static instrumenter simply appends coverage data instead of merging

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    • Subcomponent:
    • Resolved In Build:
      1.1
    • CPU:
      generic
    • OS:
      generic
    • Verification:
      Verified

      Description



      Name: dkR10031 Date: 05/30/2003



          When the static instrumenter saves collected coverage data to an
      existing coverage file it simply appends the data to the end of the file.
      In particular, this can happen when a combination of '-save...' options is
      specified. Such behaviour leads to duplicated classes in the resulting
      coverage
      file.

      Even though JCov documentation does not specify static instrumenter
      behaviour in such cases, it seems to be a bug. Data files with duplicated
      classes are inappropriate for further processing and analysis.
       
      To reproduce the bug run the script below. This script compiles
      Hello.java, instruments all classes in '.' directory by the
      Static Instrumenter using '-saveafter', '-saveatend', '-savebefore',
      and '-savebegin' options, and after that prints out all duplicates of the
      'CLASS: Hello' entry in the result java.jcov file.

      ------------ Hello.java Source Begin ---------
      class A {

          public static void a() {

              System.out.println("AAA!");
          }
      }


      class B {

          public static void b() {

              System.out.println("BBB!");
          }
      }


      class C {

          public static void c() {

              System.out.println("CCC!");
          }
      }


      class D {

          public static void d() {

              System.out.println("DDD!");
          }
      }

      public class Hello {

          public static void main(String[] args) {

              A.a();
              B.b();
              C.c();
              D.d();
              System.out.println("Hello world!");
          }
      }
      ------------ Source End ----------------------
      ------------ Script Begin --------------------
      #!/usr/bin/ksh
      uname -a
      export
      JCOV_JAR=/net/linux-11/export/home/gary/QA.JCOV/ws/image/lib/jcov.jar
      export CLASSPATH=${JCOV_JAR}:.

      export JDK=/net/linux-15/export/home/java/jdk1.4.0/sparc
      $JDK/bin/javac -Xjcov Hello.java
      $JDK/bin/java -showversion com.sun.tdk.jcov.InstrMain -commonTimeStamp -savebefore=A.a -saveafter=B.b -savebegin=C.c -saveatend=D.d -overwrite .

      $JDK/bin/java Hello
      grep 'CLASS: Hello' java.jcov
      ------------ Script End ----------------------
      ------------ Output Begin --------------------
      bash-2.03$ ksh runtest.ksh
      SunOS novo148 5.8 Generic_108528-20 sun4u sparc SUNW,Ultra-80
      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)

      AAA!
      BBB!
      CCC!
      DDD!
      Hello world!
      CLASS: Hello [public]
      CLASS: Hello [public]
      CLASS: Hello [public]
      CLASS: Hello [public]
      ------------ Output End ----------------------
      ======================================================================

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            Assignee:
            afedorch Alexey Fedorchenko (Inactive)
            Reporter:
            klooney Kevin Looney (Inactive)
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