internal jvmtiError AddGlobalReference(JvmtiEnvironment environment, JniEnvironment nativeEnvironment, jobject obj)
{
long tag;
jvmtiError error = environment.GetTag(obj, out tag);
if (error != jvmtiError.None)
{
return(error);
}
if (tag == 0)
{
return(jvmtiError.IllegalArgument);
}
_globalReferences.AddOrUpdate(tag,
t =>
{
return(Tuple.Create(nativeEnvironment.NewGlobalReference(obj), 1));
},
(t, v) =>
{
if (v.Item2 == 0)
{
return(Tuple.Create(nativeEnvironment.NewGlobalReference(obj), 1));
}
else
{
return(Tuple.Create(v.Item1, v.Item2 + 1));
}
});
return(jvmtiError.None);
}
internal jclass FindBaseClass(JvmtiEnvironment environment, JniEnvironment nativeEnvironment, jclass classHandle, string signature)
{
string currentSignature;
string genericSignature;
JvmtiErrorHandler.ThrowOnFailure(environment.GetClassSignature(classHandle, out currentSignature, out genericSignature));
if (currentSignature == signature)
{
return((jclass)nativeEnvironment.NewGlobalReference(classHandle));
}
jclass superClass = nativeEnvironment.GetSuperclass(classHandle);
if (superClass == jclass.Null)
{
return(jclass.Null);
}
jclass result = FindBaseClass(environment, nativeEnvironment, superClass, signature);
nativeEnvironment.DeleteLocalReference(superClass);
return(result);
}
private jthread CreateAgentThread(JniEnvironment nativeEnvironment)
{
jclass @class = nativeEnvironment.FindClass("java/lang/Thread");
if (@class == jclass.Null)
throw new Exception("ERROR: JNI: Cannot find java/lang/Thread with FindClass.");
jmethodID method = nativeEnvironment.GetMethodId(@class, "<init>", "()V");
if (method == jmethodID.Null)
throw new Exception("Cannot find Thread constructor method.");
jthread result = (jthread)nativeEnvironment.NewObject(@class, method);
if (result == jthread.Null)
throw new Exception("Cannot create new Thread object");
jthread agentThread = (jthread)nativeEnvironment.NewGlobalReference(result);
if (result == jthread.Null)
throw new Exception("Cannot create a new global reference for the agent thread.");
// don't need to keep the local reference around
nativeEnvironment.DeleteLocalReference(result);
return agentThread;
}
