Name: vsR10008 Date: 10/16/2003



JVMTI spec for Heap functions says:

"Tags are local to the environment; that is, the tags of one environment are
not visible in another"

But the tag which is set in one environment is visible in another -
even if the first one is disposed!

To reproduce this bug please run on Solaris the following sh script
(do not forget to change JDK_PATH var):

---- File: runme.sh ---------------------------------------------------
JDK_PATH="/java/re/jdk/1.5.0/latest/binaries/solaris-sparc"

JVMTI_H_PATH="${JDK_PATH}/include"
CC="cc"

echo "...creating a.c"
cat - > a.c <<EOF
#include <stdio.h>
#include "jvmti.h"

JavaVM *global_jvm;


JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
       global_jvm = jvm;
       return JNI_OK;
}

jvmtiEnv *createEnv(int idx) {
       jvmtiEnv *jvmti = NULL;
       jvmtiError err;
       jvmtiCapabilities cap;

       jint res;

       memset(&cap, 0, sizeof(cap));
       cap.can_tag_objects = 1;

       res = (*global_jvm)->GetEnv(global_jvm, (void **) &jvmti, JVMTI_VERSION_1_0);
       if (res != JNI_OK || jvmti == NULL) {
           printf("[%d] GetEnv ERROR: Could not create environment!\n", idx);
           return NULL;
       }

       err = (*jvmti)->AddCapabilities(jvmti, &cap);
       if (err != JVMTI_ERROR_NONE) {
          printf("[%d] AddCapabilities ERROR: %d\n", idx, err);
       }

       return jvmti;
}

JNIEXPORT void JNICALL
Java_a_check(JNIEnv *env, jclass cls) {
       jvmtiError err;
       jvmtiEnv *jvmti = NULL;
       jvmtiCapabilities cap;
       jlong tag;
       jint res;

       jvmti = createEnv(1);
       if (jvmti == NULL) return;

       err = (*jvmti)->SetTag(jvmti, cls, 123456l);
       if (err != JVMTI_ERROR_NONE) {
          printf("(SetTag) Unexpected error: %d ", err);
          return;
       }

       err = (*jvmti)->DisposeEnvironment(jvmti);
       if (err != JVMTI_ERROR_NONE) {
          printf("(DisposeEnvironment) Unexpected error: %d ", err);
          return;
       }

       jvmti = createEnv(2);
       if (jvmti == NULL) return;

       err = (*jvmti)->GetTag(jvmti, cls, &tag);
       if (err != JVMTI_ERROR_NONE) {
          printf("(GetTag) Unexpected error: %d\n", err);
          return;
       }
       if (tag == 123456l) {
          printf("FAILURE: Tag survives disposal!\n");
       }
}


EOF

echo "...creating liba.so"

${CC} -G -KPIC -o liba.so -I${JDK_PATH}/include -I${JDK_PATH}/include/solaris -I${JVMTI_H_PATH} a.c

echo "...creating a.java"

cat - > a.java <<EOF
public class a extends Thread {
       public static native void check();
       public static void main(String[] args) {
           System.loadLibrary("a");
           check();
       }
}
EOF

echo "...creating a.class"

${JDK_PATH}/bin/javac -d . a.java

echo "...running a.class"
LD_LIBRARY_PATH=. CLASSPATH=. ${JDK_PATH}/bin/java -showversion -agentlib:a a
-----------------------------------------------------------------------

Running on b23, execution log is as follows:

----------------------------------------------------------------------
bash-2.03$ runme
...creating a.c
...creating liba.so
...creating a.java
...creating a.class
...running a.class
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b23)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b23, mixed mode)

FAILURE: Tag survives disposal!
----------------------------------------------------------------------

This bug is reproducible on builds 22 and 23.

======================================================================