6537506: Provide a mechanism for specifying Java-level USDT-like dtrace probes

Initial checkin of JSDT code

Reviewed-by: acorn, sbohne

hotspot/src/share/vm/runtime/dtraceJSDT.cpp

@@ -0,0 +1,117 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_dtraceJSDT.cpp.incl"
+
+#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);
+      h_method()->set_not_compilable(CompLevel_highest_tier);
+      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