--- old/src/cpu/zero/vm/interpreterRT_zero.hpp	2017-07-27 08:48:31.886585800 -0400
+++ new/src/cpu/zero/vm/interpreterRT_zero.hpp	2017-07-27 08:48:31.565493247 -0400
@@ -67,7 +67,7 @@
   ffi_cif* _cif;
 
  protected:
-  SignatureHandlerGeneratorBase(methodHandle method, ffi_cif *cif)
+  SignatureHandlerGeneratorBase(const methodHandle& method, ffi_cif *cif)
     : NativeSignatureIterator(method), _cif(cif) {
     _cif->nargs = 0;
   }
@@ -96,7 +96,7 @@
   CodeBuffer* _cb;
 
  public:
-  SignatureHandlerGenerator(methodHandle method, CodeBuffer* buffer)
+  SignatureHandlerGenerator(const methodHandle& method, CodeBuffer* buffer)
     : SignatureHandlerGeneratorBase(method, (ffi_cif *) buffer->insts_end()),
       _cb(buffer) {
     _cb->set_insts_end((address) (cif() + 1));
@@ -115,7 +115,7 @@
   intptr_t *_dst;
 
  public:
-  SlowSignatureHandlerGenerator(methodHandle method, intptr_t* buf)
+  SlowSignatureHandlerGenerator(const methodHandle& method, intptr_t* buf)
     : SignatureHandlerGeneratorBase(method, (ffi_cif *) buf) {
     _dst = (intptr_t *) (cif() + 1);
   }