--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/runtime/NativeSignatureIterator.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2001 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.
+ *
+ */
+
+package sun.jvm.hotspot.runtime;
+
+import sun.jvm.hotspot.oops.*;
+
+/** Specialized SignatureIterator: Used for native call purposes */
+
+public abstract class NativeSignatureIterator extends SignatureIterator {
+  private Method method;
+// [RGV] We need seperate JNI and Java offset values because in 64 bit mode, the argument offsets
+//       are not in sync with the Java stack.  For example a long takes up 1 "C" stack entry
+//       but 2 Java stack entries.
+  private int offset;     // The java stack offset
+  private int prepended;  // number of prepended JNI parameters (1 JNIEnv, plus 1 mirror if static)
+  private int jni_offset; // the current parameter offset, starting with 0
+
+  public void doBool  ()                     { passInt();    jni_offset++; offset++;       }
+  public void doChar  ()                     { passInt();    jni_offset++; offset++;       }
+  public void doFloat () {
+    if (VM.getVM().isLP64()) {
+      passFloat();
+    } else {
+      passInt();
+    }
+    jni_offset++; offset++;
+  }
+
+  public void doDouble() {
+    if (VM.getVM().isLP64()) {
+      passDouble(); jni_offset++; offset += 2;
+    } else {
+      passDouble(); jni_offset += 2; offset += 2;
+    }
+  }
+
+  public void doByte  ()                     { passInt();    jni_offset++; offset++;       }
+  public void doShort ()                     { passInt();    jni_offset++; offset++;       }
+  public void doInt   ()                     { passInt();    jni_offset++; offset++;       }
+
+  public void doLong  () {
+    if (VM.getVM().isLP64()) {
+      passLong(); jni_offset++; offset += 2;
+    } else {
+      passLong(); jni_offset += 2; offset += 2;
+    }
+  }
+
+  public void doVoid  ()                     { throw new RuntimeException("should not reach here"); }
+  public void doObject(int begin, int end)   { passObject(); jni_offset++; offset++;        }
+  public void doArray (int begin, int end)   { passObject(); jni_offset++; offset++;        }
+
+  public Method       method()               { return method; }
+  public int          offset()               { return offset; }
+  public int       jniOffset()               { return jni_offset + prepended; }
+  public boolean    isStatic()               { return method.isStatic(); }
+
+  public abstract void passInt();
+  public abstract void passLong();
+  public abstract void passObject();
+  public abstract void passFloat();
+  public abstract void passDouble();
+
+  public NativeSignatureIterator(Method method) {
+    super(method.getSignature());
+    this.method = method;
+    offset = 0;
+    jni_offset = 0;
+
+    int JNIEnv_words = 1;
+    int mirror_words = 1;
+    prepended = !isStatic() ? JNIEnv_words : JNIEnv_words + mirror_words;
+  }
+
+  // iterate() calles the 2 virtual methods according to the following invocation syntax:
+  //
+  // {pass_int | pass_long | pass_object}
+  //
+  // Arguments are handled from left to right (receiver first, if any).
+  // The offset() values refer to the Java stack offsets but are 0 based and increasing.
+  // The java_offset() values count down to 0, and refer to the Java TOS.
+  // The jni_offset() values increase from 1 or 2, and refer to C arguments.
+  public void iterate() {
+    if (!isStatic()) {
+      // handle receiver (not handled by iterate because not in signature)
+      passObject(); jni_offset++; offset++;
+    }
+    iterateParameters();
+  }
+}