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.hpp

@@ -0,0 +1,89 @@
+/*
+ * 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.
+ *
+ */
+
+class RegisteredProbes;
+typedef jlong OpaqueProbes;
+
+class DTraceJSDT : AllStatic {
+ private:
+
+  static int pd_activate(void* moduleBaseAddress, jstring module,
+      jint providers_count, JVM_DTraceProvider* providers);
+  static void pd_dispose(int handle);
+  static jboolean pd_is_supported();
+
+ public:
+
+  static OpaqueProbes activate(
+      jint version, jstring module_name, jint providers_count,
+      JVM_DTraceProvider* providers, TRAPS);
+  static jboolean is_probe_enabled(jmethodID method);
+  static void dispose(OpaqueProbes handle);
+  static jboolean is_supported();
+};
+
+class RegisteredProbes : public CHeapObj {
+ private:
+  nmethod** _nmethods;      // all the probe methods
+  size_t    _count;         // number of probe methods
+  int       _helper_handle; // DTrace-assigned identifier
+
+ public:
+  RegisteredProbes(size_t count) {
+    _count = count;
+    _nmethods = NEW_C_HEAP_ARRAY(nmethod*, count);
+  }
+
+  ~RegisteredProbes() {
+    for (size_t i = 0; i < _count; ++i) {
+      // Let the sweeper reclaim it
+      _nmethods[i]->make_not_entrant();
+      _nmethods[i]->method()->clear_code();
+    }
+    FREE_C_HEAP_ARRAY(nmethod*, _nmethods);
+    _nmethods = NULL;
+    _count = 0;
+  }
+
+  static RegisteredProbes* toRegisteredProbes(OpaqueProbes p) {
+    return (RegisteredProbes*)(intptr_t)p;
+  }
+
+  static OpaqueProbes toOpaqueProbes(RegisteredProbes* p) {
+    return (OpaqueProbes)(intptr_t)p;
+  }
+
+  void set_helper_handle(int handle) { _helper_handle = handle; }
+  int helper_handle() const { return _helper_handle; }
+
+  nmethod* nmethod_at(size_t i) {
+    assert(i >= 0 && i < _count, "bad nmethod index");
+    return _nmethods[i];
+  }
+
+  void nmethod_at_put(size_t i, nmethod* nm) {
+    assert(i >= 0 && i < _count, "bad nmethod index");
+    _nmethods[i] = nm;
+  }
+};