--- a/src/share/vm/prims/jvm.h	Wed Apr 16 17:36:29 2008 -0400
+++ b/src/share/vm/prims/jvm.h	Thu Apr 17 22:18:15 2008 -0400
@@ -606,6 +606,83 @@
 JNIEXPORT jboolean JNICALL
 JVM_CX8Field(JNIEnv *env, jobject obj, jfieldID fldID, jlong oldVal, jlong newVal);
 
+/*
+ * com.sun.dtrace.jsdt support
+ */
+
+#define JVM_TRACING_DTRACE_VERSION 1
+
+/*
+ * Structure to pass one probe description to JVM.
+ *
+ * The VM will overwrite the definition of the referenced method with
+ * code that will fire the probe.
+ */
+typedef struct {
+    jmethodID method;
+    jstring   function;
+    jstring   name;
+    void*     reserved[4];     // for future use
+} JVM_DTraceProbe;
+
+/**
+ * Encapsulates the stability ratings for a DTrace provider field
+ */
+typedef struct {
+    jint nameStability;
+    jint dataStability;
+    jint dependencyClass;
+} JVM_DTraceInterfaceAttributes;
+
+/*
+ * Structure to pass one provider description to JVM
+ */
+typedef struct {
+    jstring                       name;
+    JVM_DTraceProbe*              probes;
+    jint                          probe_count;
+    JVM_DTraceInterfaceAttributes providerAttributes;
+    JVM_DTraceInterfaceAttributes moduleAttributes;
+    JVM_DTraceInterfaceAttributes functionAttributes;
+    JVM_DTraceInterfaceAttributes nameAttributes;
+    JVM_DTraceInterfaceAttributes argsAttributes;
+    void*                         reserved[4]; // for future use
+} JVM_DTraceProvider;
+
+/*
+ * Get the version number the JVM was built with
+ */
+JNIEXPORT jint JNICALL
+JVM_DTraceGetVersion(JNIEnv* env);
+
+/*
+ * Register new probe with given signature, return global handle
+ *
+ * The version passed in is the version that the library code was
+ * built with.
+ */
+JNIEXPORT jlong JNICALL
+JVM_DTraceActivate(JNIEnv* env, jint version, jstring module_name,
+  jint providers_count, JVM_DTraceProvider* providers);
+
+/*
+ * Check JSDT probe
+ */
+JNIEXPORT jboolean JNICALL
+JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method);
+
+/*
+ * Destroy custom DOF
+ */
+JNIEXPORT void JNICALL
+JVM_DTraceDispose(JNIEnv* env, jlong handle);
+
+/*
+ * Check to see if DTrace is supported by OS
+ */
+JNIEXPORT jboolean JNICALL
+JVM_DTraceIsSupported(JNIEnv* env);
+
 /*************************************************************************
  PART 2: Support for the Verifier and Class File Format Checker
  ************************************************************************/