/*

 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "classfile/javaClasses.hpp"

#include "code/codeBlob.hpp"

#include "memory/allocation.hpp"

#include "prims/jvm.h"

#include "runtime/dtraceJSDT.hpp"

#include "runtime/jniHandles.hpp"

#include "runtime/os.hpp"

#include "utilities/exceptions.hpp"

#include "utilities/globalDefinitions.hpp"

#include "utilities/utf8.hpp"

#ifdef HAVE_DTRACE_H

jlong DTraceJSDT::activate(

    jint version, jstring module_name, jint providers_count,

    JVM_DTraceProvider* providers, TRAPS) {

  size_t count = 0;

  RegisteredProbes* probes = NULL;

  if (!is_supported()) {

    return 0;

  }

  assert(module_name != NULL, "valid module name");

  assert(providers != NULL, "valid provider array");

  for (int i = 0; i < providers_count; ++i) {

    count += providers[i].probe_count;

  }

  probes = new RegisteredProbes(count);

  count = 0;

  for (int i = 0; i < providers_count; ++i) {

    assert(providers[i].name != NULL, "valid provider name");

    assert(providers[i].probe_count == 0 || providers[i].probes != NULL,

           "valid probe count");

    for (int j = 0; j < providers[i].probe_count; ++j) {

      JVM_DTraceProbe* probe = &(providers[i].probes[j]);

      assert(probe != NULL, "valid probe");

      assert(probe->method != NULL, "valid method");

      assert(probe->name != NULL, "valid probe name");

      assert(probe->function != NULL, "valid probe function spec");

      methodHandle h_method =

        methodHandle(THREAD, JNIHandles::resolve_jmethod_id(probe->method));

      nmethod* nm = AdapterHandlerLibrary::create_dtrace_nmethod(h_method);

      if (nm == NULL) {

        delete probes;

        THROW_MSG_0(vmSymbols::java_lang_RuntimeException(),

          "Unable to register DTrace probes (CodeCache: no room for DTrace nmethods).");

      }

      h_method()->set_not_compilable();

      h_method()->set_code(h_method, nm);

      probes->nmethod_at_put(count++, nm);

    }

  }

  int handle = pd_activate((void*)probes,

    module_name, providers_count, providers);

  if (handle <= 0) {

    delete probes;

    THROW_MSG_0(vmSymbols::java_lang_RuntimeException(),

      "Unable to register DTrace probes (internal error).");

  }

  probes->set_helper_handle(handle);

  return RegisteredProbes::toOpaqueProbes(probes);

}

jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {

  methodOop m = JNIHandles::resolve_jmethod_id(method);

  return nativeInstruction_at(m->code()->trap_address())->is_dtrace_trap();

}

void DTraceJSDT::dispose(OpaqueProbes probes) {

  RegisteredProbes* p = RegisteredProbes::toRegisteredProbes(probes);

  if (probes != -1 && p != NULL) {

    pd_dispose(p->helper_handle());

    delete p;

  }

}

jboolean DTraceJSDT::is_supported() {

  return pd_is_supported();

}

#else // HAVE_DTRACE_H

jlong DTraceJSDT::activate(

    jint version, jstring module_name, jint providers_count,

    JVM_DTraceProvider* providers, TRAPS) {

  return 0;

}

jboolean DTraceJSDT::is_probe_enabled(jmethodID method) {

  return false;

}

void DTraceJSDT::dispose(OpaqueProbes probes) {

  return;

}

jboolean DTraceJSDT::is_supported() {

  return false;

}

#endif // ndef HAVE_DTRACE_H