--- /dev/null	2009-10-08 09:48:12.966002103 +0100
+++ new/hotspot/src/cpu/zero/vm/interpreterRT_zero.hpp	2009-10-08 17:31:17.000000000 +0100
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2003-2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2007, 2008 Red Hat, Inc.
+ * 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 SignatureHandler {
+ public:
+  static SignatureHandler *from_handlerAddr(address handlerAddr) {
+    return (SignatureHandler *) handlerAddr;
+  }
+
+ public:
+  ffi_cif* cif() const {
+    return (ffi_cif *) this;
+  }
+
+  int argument_count() const {
+    return cif()->nargs;
+  }
+
+  ffi_type** argument_types() const {
+    return (ffi_type**) (cif() + 1);
+  }
+
+  ffi_type* argument_type(int i) const {
+    return argument_types()[i];
+  }
+
+  ffi_type* result_type() const {
+    return *(argument_types() + argument_count());
+  }
+
+ protected:
+  friend class InterpreterRuntime;
+  friend class SignatureHandlerLibrary;
+
+  void finalize();
+};
+
+class SignatureHandlerGeneratorBase : public NativeSignatureIterator {
+ private:
+  ffi_cif* _cif;
+
+ protected:
+  SignatureHandlerGeneratorBase(methodHandle method, ffi_cif *cif)
+    : NativeSignatureIterator(method), _cif(cif) {
+    _cif->nargs = 0;
+  }
+
+  ffi_cif *cif() const {
+    return _cif;
+  }
+
+ public:
+  void generate(uint64_t fingerprint);
+
+ private:
+  void pass_int();
+  void pass_long();
+  void pass_float();
+  void pass_double();
+  void pass_object();
+
+ private:
+  void push(BasicType type);
+  virtual void push(intptr_t value) = 0;
+};
+
+class SignatureHandlerGenerator : public SignatureHandlerGeneratorBase {
+ private:
+  CodeBuffer* _cb;
+
+ public:
+  SignatureHandlerGenerator(methodHandle method, CodeBuffer* buffer)
+    : SignatureHandlerGeneratorBase(method, (ffi_cif *) buffer->code_end()),
+      _cb(buffer) {
+    _cb->set_code_end((address) (cif() + 1));
+  }
+
+ private:
+  void push(intptr_t value) {
+    intptr_t *dst = (intptr_t *) _cb->code_end();
+    _cb->set_code_end((address) (dst + 1));
+    *dst = value;
+  }
+};
+
+class SlowSignatureHandlerGenerator : public SignatureHandlerGeneratorBase {
+ private:
+  intptr_t *_dst;
+
+ public:
+  SlowSignatureHandlerGenerator(methodHandle method, intptr_t* buf)
+    : SignatureHandlerGeneratorBase(method, (ffi_cif *) buf) {
+    _dst = (intptr_t *) (cif() + 1);
+  }
+
+ private:
+  void push(intptr_t value) {
+    *(_dst++) = value;
+  }
+
+ public:
+  SignatureHandler *handler() const {
+    return (SignatureHandler *) cif();
+  }
+};