--- a/hotspot/src/cpu/sparc/vm/methodHandles_sparc.cpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/cpu/sparc/vm/methodHandles_sparc.cpp	Thu May 12 14:04:48 2011 -0700
@@ -142,18 +142,8 @@
   Register O2_form    = O2_scratch;
   Register O3_adapter = O3_scratch;
   __ load_heap_oop(Address(O0_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes,               O1_scratch)), O2_form);
-  // load_heap_oop(Address(O2_form,  __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, O1_scratch)), O3_adapter);
-  // deal with old JDK versions:
-  __ add(          Address(O2_form,  __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, O1_scratch)), O3_adapter);
-  __ cmp(O3_adapter, O2_form);
-  Label sorry_no_invoke_generic;
-  __ brx(Assembler::lessUnsigned, false, Assembler::pn, sorry_no_invoke_generic);
-  __ delayed()->nop();
-
-  __ load_heap_oop(Address(O3_adapter, 0), O3_adapter);
-  __ tst(O3_adapter);
-  __ brx(Assembler::zero, false, Assembler::pn, sorry_no_invoke_generic);
-  __ delayed()->nop();
+  __ load_heap_oop(Address(O2_form,  __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, O1_scratch)), O3_adapter);
+  __ verify_oop(O3_adapter);
   __ st_ptr(O3_adapter, Address(O4_argbase, 1 * Interpreter::stackElementSize));
   // As a trusted first argument, pass the type being called, so the adapter knows
   // the actual types of the arguments and return values.
@@ -164,12 +154,6 @@
   trace_method_handle(_masm, "invokeGeneric");
   __ jump_to_method_handle_entry(G3_method_handle, O1_scratch);
 
-  __ bind(sorry_no_invoke_generic); // no invokeGeneric implementation available!
-  __ mov(O0_mtype, G5_method_type);  // required by throw_WrongMethodType
-  // mov(G3_method_handle, G3_method_handle);  // already in this register
-  __ jump_to(AddressLiteral(Interpreter::throw_WrongMethodType_entry()), O1_scratch);
-  __ delayed()->nop();
-
   return entry_point;
 }
 

--- a/hotspot/src/cpu/x86/vm/methodHandles_x86.cpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/cpu/x86/vm/methodHandles_x86.cpp	Thu May 12 14:04:48 2011 -0700
@@ -163,7 +163,7 @@
   BLOCK_COMMENT("ricochet_blob.bounce");
 
   if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);
-  trace_method_handle(_masm, "ricochet_blob.bounce");
+  trace_method_handle(_masm, "return/ricochet_blob.bounce");
 
   __ jmp(frame_address(continuation_offset_in_bytes()));
   __ hlt();
@@ -615,18 +615,10 @@
                    rcx_argslot, rbx_temp, rdx_temp);
 
   // load up an adapter from the calling type (Java weaves this)
-  __ load_heap_oop(rdx_temp, Address(rax_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes, rdi_temp)));
   Register rdx_adapter = rdx_temp;
-  // __ load_heap_oop(rdx_adapter, Address(rdx_temp, java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes()));
-  // deal with old JDK versions:
-  __ lea(rdi_temp, Address(rdx_temp, __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, rdi_temp)));
-  __ cmpptr(rdi_temp, rdx_temp);
-  Label sorry_no_invoke_generic;
-  __ jcc(Assembler::below, sorry_no_invoke_generic);
-
-  __ load_heap_oop(rdx_adapter, Address(rdi_temp, 0));
-  __ testptr(rdx_adapter, rdx_adapter);
-  __ jcc(Assembler::zero, sorry_no_invoke_generic);
+  __ load_heap_oop(rdx_temp,    Address(rax_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes,               rdi_temp)));
+  __ load_heap_oop(rdx_adapter, Address(rdx_temp,  __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, rdi_temp)));
+  __ verify_oop(rdx_adapter);
   __ movptr(Address(rcx_argslot, 1 * Interpreter::stackElementSize), rdx_adapter);
   // As a trusted first argument, pass the type being called, so the adapter knows
   // the actual types of the arguments and return values.
@@ -637,12 +629,6 @@
   trace_method_handle(_masm, "invokeGeneric");
   __ jump_to_method_handle_entry(rcx, rdi_temp);
 
-  __ bind(sorry_no_invoke_generic); // no invokeGeneric implementation available!
-  __ movptr(rcx_recv, Address(rcx_argslot, -1 * Interpreter::stackElementSize));  // recover original MH
-  __ push(rax_mtype);       // required mtype
-  __ push(rcx_recv);        // bad mh (1st stacked argument)
-  __ jump(ExternalAddress(Interpreter::throw_WrongMethodType_entry()));
-
   return entry_point;
 }
 
@@ -688,7 +674,7 @@
     __ movptr(Address(rdx_temp, arg_slots, Interpreter::stackElementScale()), rbx_temp);
     __ addptr(rdx_temp, wordSize);
     __ cmpptr(rdx_temp, rax_argslot);
-    __ jcc(Assembler::less, loop);
+    __ jcc(Assembler::below, loop);
   }
 
   // Now move the argslot down, to point to the opened-up space.
@@ -731,7 +717,7 @@
     __ movptr(Address(rdx_temp, arg_slots, Interpreter::stackElementScale()), rbx_temp);
     __ addptr(rdx_temp, -wordSize);
     __ cmpptr(rdx_temp, rsp);
-    __ jcc(Assembler::greaterEqual, loop);
+    __ jcc(Assembler::aboveEqual, loop);
   }
 
   // Now move the argslot up, to point to the just-copied block.
@@ -980,12 +966,21 @@
                               intptr_t* saved_sp,
                               intptr_t* saved_bp) {
   // called as a leaf from native code: do not block the JVM!
+  bool has_mh = (strstr(adaptername, "return/") == NULL);  // return adapters don't have rcx_mh
   intptr_t* last_sp = (intptr_t*) saved_bp[frame::interpreter_frame_last_sp_offset];
-  intptr_t* base_sp = (intptr_t*) saved_bp[frame::interpreter_frame_monitor_block_top_offset];
-  tty->print_cr("MH %s mh="INTPTR_FORMAT" sp=("INTPTR_FORMAT"+"INTX_FORMAT") stack_size="INTX_FORMAT" bp="INTPTR_FORMAT,
-                adaptername, (intptr_t)mh, (intptr_t)entry_sp, (intptr_t)(saved_sp - entry_sp), (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
-  if (last_sp != saved_sp && last_sp != NULL)
-    tty->print_cr("*** last_sp="INTPTR_FORMAT, (intptr_t)last_sp);
+  intptr_t* base_sp = last_sp;
+  typedef MethodHandles::RicochetFrame RicochetFrame;
+  RicochetFrame* rfp = (RicochetFrame*)((address)saved_bp - RicochetFrame::sender_link_offset_in_bytes());
+  if (!UseRicochetFrames || Universe::heap()->is_in((address) rfp->saved_args_base())) {
+    // Probably an interpreter frame.
+    base_sp = (intptr_t*) saved_bp[frame::interpreter_frame_monitor_block_top_offset];
+  }
+  intptr_t    mh_reg = (intptr_t)mh;
+  const char* mh_reg_name = "rcx_mh";
+  if (!has_mh)  mh_reg_name = "rcx";
+  tty->print_cr("MH %s %s="PTR_FORMAT" sp=("PTR_FORMAT"+"INTX_FORMAT") stack_size="INTX_FORMAT" bp="PTR_FORMAT,
+                adaptername, mh_reg_name, mh_reg,
+                (intptr_t)entry_sp, (intptr_t)(saved_sp - entry_sp), (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
   if (Verbose) {
     tty->print(" reg dump: ");
     int saved_regs_count = (entry_sp-1) - saved_regs;
@@ -996,18 +991,21 @@
         tty->cr();
         tty->print("   + dump: ");
       }
-      tty->print(" %d: "INTPTR_FORMAT, i, saved_regs[i]);
+      tty->print(" %d: "PTR_FORMAT, i, saved_regs[i]);
     }
     tty->cr();
+    if (last_sp != saved_sp && last_sp != NULL)
+      tty->print_cr("*** last_sp="PTR_FORMAT, (intptr_t)last_sp);
     int stack_dump_count = 16;
     if (stack_dump_count < (int)(saved_bp + 2 - saved_sp))
       stack_dump_count = (int)(saved_bp + 2 - saved_sp);
     if (stack_dump_count > 64)  stack_dump_count = 48;
     for (i = 0; i < stack_dump_count; i += 4) {
-      tty->print_cr(" dump at SP[%d] "INTPTR_FORMAT": "INTPTR_FORMAT" "INTPTR_FORMAT" "INTPTR_FORMAT" "INTPTR_FORMAT,
+      tty->print_cr(" dump at SP[%d] "PTR_FORMAT": "PTR_FORMAT" "PTR_FORMAT" "PTR_FORMAT" "PTR_FORMAT,
                     i, (intptr_t) &entry_sp[i+0], entry_sp[i+0], entry_sp[i+1], entry_sp[i+2], entry_sp[i+3]);
     }
-    print_method_handle(mh);
+    if (has_mh)
+      print_method_handle(mh);
   }
 }
 
@@ -1073,7 +1071,6 @@
           //OP_COLLECT_ARGS is below...
          |(1<<java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS)
          |(!UseRicochetFrames ? 0 :
-           LP64_ONLY(FLAG_IS_DEFAULT(UseRicochetFrames) ? 0 :)
            java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() <= 0 ? 0 :
            ((1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF)
            |(1<<java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS)
@@ -1546,7 +1543,7 @@
 #else //_LP64
       if (ek == _adapter_opt_f2d) {
         __ fld_s(vmarg);        // load float to ST0
-        __ fstp_s(vmarg);       // store single
+        __ fstp_d(vmarg);       // store double
       } else {
         __ fld_d(vmarg);        // load double to ST0
         __ fstp_s(vmarg);       // store single
@@ -2353,7 +2350,7 @@
                        rbx_temp, rdi_temp);
         __ addptr(rsi_source, type2aelembytes(elem_type));
         __ cmpptr(rdx_fill_ptr, rax_argslot);
-        __ jcc(Assembler::greater, loop);
+        __ jcc(Assembler::above, loop);
       } else if (length_constant == 0) {
         // nothing to copy
       } else {

--- a/hotspot/src/share/vm/ci/ciMethodData.hpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/share/vm/ci/ciMethodData.hpp	Thu May 12 14:04:48 2011 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2011, Oracle and/or its affiliates. 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
@@ -233,7 +233,10 @@
 
 public:
   bool is_method_data()  { return true; }
-  bool is_empty() { return _state == empty_state; }
+
+  void set_mature() { _state = mature_state; }
+
+  bool is_empty()  { return _state == empty_state; }
   bool is_mature() { return _state == mature_state; }
 
   int creation_mileage() { return _orig.creation_mileage(); }

--- a/hotspot/src/share/vm/ci/ciMethodHandle.cpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/share/vm/ci/ciMethodHandle.cpp	Thu May 12 14:04:48 2011 -0700
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "ci/ciClassList.hpp"
 #include "ci/ciInstance.hpp"
+#include "ci/ciMethodData.hpp"
 #include "ci/ciMethodHandle.hpp"
 #include "ci/ciUtilities.hpp"
 #include "prims/methodHandleWalk.hpp"
@@ -36,13 +37,13 @@
 // ciMethodHandle::get_adapter
 //
 // Return an adapter for this MethodHandle.
-ciMethod* ciMethodHandle::get_adapter(bool is_invokedynamic) const {
+ciMethod* ciMethodHandle::get_adapter_impl(bool is_invokedynamic) const {
   VM_ENTRY_MARK;
   Handle h(get_oop());
   methodHandle callee(_callee->get_methodOop());
   // We catch all exceptions here that could happen in the method
   // handle compiler and stop the VM.
-  MethodHandleCompiler mhc(h, callee, call_profile()->count(), is_invokedynamic, THREAD);
+  MethodHandleCompiler mhc(h, callee, _profile->count(), is_invokedynamic, THREAD);
   if (!HAS_PENDING_EXCEPTION) {
     methodHandle m = mhc.compile(THREAD);
     if (!HAS_PENDING_EXCEPTION) {
@@ -58,6 +59,22 @@
   return NULL;
 }
 
+// ------------------------------------------------------------------
+// ciMethodHandle::get_adapter
+//
+// Return an adapter for this MethodHandle.
+ciMethod* ciMethodHandle::get_adapter(bool is_invokedynamic) const {
+  ciMethod* result = get_adapter_impl(is_invokedynamic);
+  if (result) {
+    // Fake up the MDO maturity.
+    ciMethodData* mdo = result->method_data();
+    if (mdo != NULL && _caller->method_data() != NULL && _caller->method_data()->is_mature()) {
+      mdo->set_mature();
+    }
+  }
+  return result;
+}
+
 
 // ------------------------------------------------------------------
 // ciMethodHandle::print_impl

--- a/hotspot/src/share/vm/ci/ciMethodHandle.hpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/share/vm/ci/ciMethodHandle.hpp	Thu May 12 14:04:48 2011 -0700
@@ -35,35 +35,36 @@
 class ciMethodHandle : public ciInstance {
 private:
   ciMethod*      _callee;
+  ciMethod*      _caller;
   ciCallProfile* _profile;
 
   // Return an adapter for this MethodHandle.
-  ciMethod* get_adapter(bool is_invokedynamic) const;
+  ciMethod* get_adapter_impl(bool is_invokedynamic) const;
+  ciMethod* get_adapter(     bool is_invokedynamic) const;
 
 protected:
   void print_impl(outputStream* st);
 
 public:
-  ciMethodHandle(instanceHandle h_i) : ciInstance(h_i) {};
+  ciMethodHandle(instanceHandle h_i) :
+    ciInstance(h_i),
+    _callee(NULL),
+    _caller(NULL),
+    _profile(NULL)
+  {}
 
   // What kind of ciObject is this?
   bool is_method_handle() const { return true; }
 
-  ciMethod* callee() const { return _callee; }
-  void  set_callee(ciMethod* m) { _callee = m; }
-
-  ciCallProfile*     call_profile() const                 { return _profile;           }
-  void           set_call_profile(ciCallProfile* profile) {        _profile = profile; }
+  void set_callee(ciMethod* m)                  { _callee  = m;       }
+  void set_caller(ciMethod* m)                  { _caller  = m;       }
+  void set_call_profile(ciCallProfile* profile) { _profile = profile; }
 
   // Return an adapter for a MethodHandle call.
-  ciMethod* get_method_handle_adapter() const {
-    return get_adapter(false);
-  }
+  ciMethod* get_method_handle_adapter() const { return get_adapter(false); }
 
   // Return an adapter for an invokedynamic call.
-  ciMethod* get_invokedynamic_adapter() const {
-    return get_adapter(true);
-  }
+  ciMethod* get_invokedynamic_adapter() const { return get_adapter(true);  }
 };
 
 #endif // SHARE_VM_CI_CIMETHODHANDLE_HPP

--- a/hotspot/src/share/vm/opto/doCall.cpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/share/vm/opto/doCall.cpp	Thu May 12 14:04:48 2011 -0700
@@ -62,7 +62,10 @@
 CallGenerator* Compile::call_generator(ciMethod* call_method, int vtable_index, bool call_is_virtual,
                                        JVMState* jvms, bool allow_inline,
                                        float prof_factor) {
-  CallGenerator* cg;
+  CallGenerator*  cg;
+  ciMethod*       caller   = jvms->method();
+  int             bci      = jvms->bci();
+  Bytecodes::Code bytecode = caller->java_code_at_bci(bci);
   guarantee(call_method != NULL, "failed method resolution");
 
   // Dtrace currently doesn't work unless all calls are vanilla
@@ -73,8 +76,7 @@
   // Note: When we get profiling during stage-1 compiles, we want to pull
   // from more specific profile data which pertains to this inlining.
   // Right now, ignore the information in jvms->caller(), and do method[bci].
-  ciCallProfile profile    = jvms->method()->call_profile_at_bci(jvms->bci());
-  Bytecodes::Code bytecode = jvms->method()->java_code_at_bci(jvms->bci());
+  ciCallProfile profile = caller->call_profile_at_bci(bci);
 
   // See how many times this site has been invoked.
   int site_count = profile.count();
@@ -126,9 +128,10 @@
         ciObject* const_oop = oop_ptr->const_oop();
         ciMethodHandle* method_handle = const_oop->as_method_handle();
 
-        // Set the actually called method to have access to the class
-        // and signature in the MethodHandleCompiler.
+        // Set the callee to have access to the class and signature in
+        // the MethodHandleCompiler.
         method_handle->set_callee(call_method);
+        method_handle->set_caller(caller);
         method_handle->set_call_profile(&profile);
 
         // Get an adapter for the MethodHandle.
@@ -150,9 +153,10 @@
       ciCallSite*     call_site     = str.get_call_site();
       ciMethodHandle* method_handle = call_site->get_target();
 
-      // Set the actually called method to have access to the class
-      // and signature in the MethodHandleCompiler.
+      // Set the callee to have access to the class and signature in
+      // the MethodHandleCompiler.
       method_handle->set_callee(call_method);
+      method_handle->set_caller(caller);
       method_handle->set_call_profile(&profile);
 
       // Get an adapter for the MethodHandle.

--- a/hotspot/src/share/vm/prims/methodHandleWalk.cpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/share/vm/prims/methodHandleWalk.cpp	Thu May 12 14:04:48 2011 -0700
@@ -31,6 +31,11 @@
  * JSR 292 reference implementation: method handle structure analysis
  */
 
+#ifdef PRODUCT
+#define print_method_handle(mh) {}
+#else //PRODUCT
+extern "C" void print_method_handle(oop mh);
+#endif //PRODUCT
 
 // -----------------------------------------------------------------------------
 // MethodHandleChain
@@ -206,8 +211,10 @@
         lose("bad argument index", CHECK_(empty));
       }
 
+      bool retain_original_args = false;  // used by fold/collect logic
+
       // perform the adapter action
-      switch (chain().adapter_conversion_op()) {
+      switch (conv_op) {
       case java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY:
         // No changes to arguments; pass the bits through.
         break;
@@ -216,51 +223,36 @@
         // To keep the verifier happy, emit bitwise ("raw") conversions as needed.
         // See MethodHandles::same_basic_type_for_arguments for allowed conversions.
         Handle incoming_mtype(THREAD, chain().method_type_oop());
-        oop outgoing_mh_oop = chain().vmtarget_oop();
-        if (!java_lang_invoke_MethodHandle::is_instance(outgoing_mh_oop))
-          lose("outgoing target not a MethodHandle", CHECK_(empty));
-        Handle outgoing_mtype(THREAD, java_lang_invoke_MethodHandle::type(outgoing_mh_oop));
-        outgoing_mh_oop = NULL;  // GC safety
+        Handle outgoing_mtype;
+        {
+          oop outgoing_mh_oop = chain().vmtarget_oop();
+          if (!java_lang_invoke_MethodHandle::is_instance(outgoing_mh_oop))
+            lose("outgoing target not a MethodHandle", CHECK_(empty));
+          outgoing_mtype = Handle(THREAD, java_lang_invoke_MethodHandle::type(outgoing_mh_oop));
+        }
 
         int nptypes = java_lang_invoke_MethodType::ptype_count(outgoing_mtype());
         if (nptypes != java_lang_invoke_MethodType::ptype_count(incoming_mtype()))
           lose("incoming and outgoing parameter count do not agree", CHECK_(empty));
 
+        // Argument types.
         for (int i = 0, slot = _outgoing.length() - 1; slot >= 0; slot--) {
           SlotState* arg_state = slot_state(slot);
           if (arg_state->_type == T_VOID)  continue;
-          ArgToken arg = _outgoing.at(slot)._arg;
 
-          klassOop  in_klass  = NULL;
-          klassOop  out_klass = NULL;
-          BasicType inpbt  = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(incoming_mtype(), i), &in_klass);
-          BasicType outpbt = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(outgoing_mtype(), i), &out_klass);
-          assert(inpbt == arg.basic_type(), "sanity");
-
-          if (inpbt != outpbt) {
-            vmIntrinsics::ID iid = vmIntrinsics::for_raw_conversion(inpbt, outpbt);
-            if (iid == vmIntrinsics::_none) {
-              lose("no raw conversion method", CHECK_(empty));
-            }
-            ArgToken arglist[2];
-            arglist[0] = arg;         // outgoing 'this'
-            arglist[1] = ArgToken();  // sentinel
-            arg = make_invoke(NULL, iid, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK_(empty));
-            change_argument(inpbt, slot, outpbt, arg);
-          }
-
+          klassOop  src_klass = NULL;
+          klassOop  dst_klass = NULL;
+          BasicType src = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(incoming_mtype(), i), &src_klass);
+          BasicType dst = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(outgoing_mtype(), i), &dst_klass);
+          retype_raw_argument_type(src, dst, slot, CHECK_(empty));
           i++;  // We need to skip void slots at the top of the loop.
         }
 
-        BasicType inrbt  = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(incoming_mtype()));
-        BasicType outrbt = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(outgoing_mtype()));
-        if (inrbt != outrbt) {
-          if (inrbt == T_INT && outrbt == T_VOID) {
-            // See comments in MethodHandles::same_basic_type_for_arguments.
-          } else {
-            assert(false, "IMPLEMENT ME");
-            lose("no raw conversion method", CHECK_(empty));
-          }
+        // Return type.
+        {
+          BasicType src = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(incoming_mtype()));
+          BasicType dst = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(outgoing_mtype()));
+          retype_raw_return_type(src, dst, CHECK_(empty));
         }
         break;
       }
@@ -273,7 +265,7 @@
         assert(dest == arg_state->_type, "");
         ArgToken arg = arg_state->_arg;
         ArgToken new_arg = make_conversion(T_OBJECT, dest_klass, Bytecodes::_checkcast, arg, CHECK_(empty));
-        assert(arg.index() == new_arg.index(), "should be the same index");
+        assert(arg.token_type() >= tt_symbolic || arg.index() == new_arg.index(), "should be the same index");
         debug_only(dest_klass = (klassOop)badOop);
         break;
       }
@@ -332,7 +324,7 @@
         ArgToken arglist[2];
         arglist[0] = arg;         // outgoing value
         arglist[1] = ArgToken();  // sentinel
-        arg = make_invoke(NULL, boxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_(empty));
+        arg = make_invoke(NULL, boxer, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK_(empty));
         change_argument(src, arg_slot, T_OBJECT, arg);
         break;
       }
@@ -404,13 +396,54 @@
         break;
       }
 
-      case java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS: { //NYI, may GC
-        lose("unimplemented", CHECK_(empty));
-        break;
-      }
-
-      case java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS: { //NYI, may GC
-        lose("unimplemented", CHECK_(empty));
+      case java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS:
+        retain_original_args = true;   // and fall through:
+      case java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS: {
+        // call argument MH recursively
+        //{static int x; if (!x++) print_method_handle(chain().method_handle_oop()); --x;}
+        Handle recursive_mh(THREAD, chain().adapter_arg_oop());
+        if (!java_lang_invoke_MethodHandle::is_instance(recursive_mh())) {
+          lose("recursive target not a MethodHandle", CHECK_(empty));
+        }
+        Handle recursive_mtype(THREAD, java_lang_invoke_MethodHandle::type(recursive_mh()));
+        int argc = java_lang_invoke_MethodType::ptype_count(recursive_mtype());
+        int coll_slots = java_lang_invoke_MethodHandle::vmslots(recursive_mh());
+        BasicType rtype = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(recursive_mtype()));
+        ArgToken* arglist = NEW_RESOURCE_ARRAY(ArgToken, 1 + argc + 1);  // 1+: mh, +1: sentinel
+        arglist[0] = make_oop_constant(recursive_mh(), CHECK_(empty));
+        if (arg_slot < 0 || coll_slots < 0 || arg_slot + coll_slots > _outgoing.length()) {
+          lose("bad fold/collect arg slot", CHECK_(empty));
+        }
+        for (int i = 0, slot = arg_slot + coll_slots - 1; slot >= arg_slot; slot--) {
+          SlotState* arg_state = slot_state(slot);
+          BasicType  arg_type  = arg_state->_type;
+          if (arg_type == T_VOID)  continue;
+          ArgToken arg = _outgoing.at(slot)._arg;
+          if (i >= argc) { lose("bad fold/collect arg", CHECK_(empty)); }
+          arglist[1+i] = arg;
+          if (!retain_original_args)
+            change_argument(arg_type, slot, T_VOID, ArgToken(tt_void));
+        }
+        arglist[1+argc] = ArgToken();  // sentinel
+        oop invoker = java_lang_invoke_MethodTypeForm::vmlayout(
+                          java_lang_invoke_MethodType::form(recursive_mtype()) );
+        if (invoker == NULL || !invoker->is_method()) {
+          lose("bad vmlayout slot", CHECK_(empty));
+        }
+        // FIXME: consider inlining the invokee at the bytecode level
+        ArgToken ret = make_invoke(methodOop(invoker), vmIntrinsics::_none,
+                                   Bytecodes::_invokevirtual, false, 1+argc, &arglist[0], CHECK_(empty));
+        DEBUG_ONLY(invoker = NULL);
+        if (rtype == T_OBJECT) {
+          klassOop rklass = java_lang_Class::as_klassOop( java_lang_invoke_MethodType::rtype(recursive_mtype()) );
+          if (rklass != SystemDictionary::Object_klass() &&
+              !Klass::cast(rklass)->is_interface()) {
+            // preserve type safety
+            ret = make_conversion(T_OBJECT, rklass, Bytecodes::_checkcast, ret, CHECK_(empty));
+          }
+        }
+        int ret_slot = arg_slot + (retain_original_args ? coll_slots : 0);
+        change_argument(T_VOID, ret_slot, rtype, ret);
         break;
       }
 
@@ -504,7 +537,7 @@
           lose("bad bound value", CHECK_(empty));
         }
       }
-      debug_only(arg_oop = badOop);
+      DEBUG_ONLY(arg_oop = badOop);
       change_argument(T_VOID, arg_slot, arg_type, arg);
     }
 
@@ -547,11 +580,10 @@
   }
   for (int i = 0; i < nptypes; i++) {
     klassOop  arg_type_klass = NULL;
-    BasicType arg_type = java_lang_Class::as_BasicType(
-                java_lang_invoke_MethodType::ptype(mtype(), i), &arg_type_klass);
+    BasicType arg_type = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::ptype(mtype(), i), &arg_type_klass);
     int index = new_local_index(arg_type);
     ArgToken arg = make_parameter(arg_type, arg_type_klass, index, CHECK);
-    debug_only(arg_type_klass = (klassOop) NULL);
+    DEBUG_ONLY(arg_type_klass = (klassOop) NULL);
     _outgoing.at_put(argp, make_state(arg_type, arg));
     if (type2size[arg_type] == 2) {
       // add the extra slot, so we can model the JVM stack
@@ -561,8 +593,7 @@
   }
   // call make_parameter at the end of the list for the return type
   klassOop  ret_type_klass = NULL;
-  BasicType ret_type = java_lang_Class::as_BasicType(
-              java_lang_invoke_MethodType::rtype(mtype()), &ret_type_klass);
+  BasicType ret_type = java_lang_Class::as_BasicType(java_lang_invoke_MethodType::rtype(mtype()), &ret_type_klass);
   ArgToken  ret = make_parameter(ret_type, ret_type_klass, -1, CHECK);
   // ignore ret; client can catch it if needed
 }
@@ -614,6 +645,48 @@
 
 
 // -----------------------------------------------------------------------------
+// MethodHandleWalker::retype_raw_conversion
+//
+// Do the raw retype conversions for OP_RETYPE_RAW.
+void MethodHandleWalker::retype_raw_conversion(BasicType src, BasicType dst, bool for_return, int slot, TRAPS) {
+  if (src != dst) {
+    if (MethodHandles::same_basic_type_for_returns(src, dst, /*raw*/ true)) {
+      if (MethodHandles::is_float_fixed_reinterpretation_cast(src, dst)) {
+        if (for_return)  Untested("MHW return raw conversion");  // still untested
+        vmIntrinsics::ID iid = vmIntrinsics::for_raw_conversion(src, dst);
+        if (iid == vmIntrinsics::_none) {
+          lose("no raw conversion method", CHECK);
+        }
+        ArgToken arglist[2];
+        if (!for_return) {
+          // argument type conversion
+          ArgToken arg = _outgoing.at(slot)._arg;
+          assert(arg.token_type() >= tt_symbolic || src == arg.basic_type(), "sanity");
+          arglist[0] = arg;         // outgoing 'this'
+          arglist[1] = ArgToken();  // sentinel
+          arg = make_invoke(NULL, iid, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK);
+          change_argument(src, slot, dst, arg);
+        } else {
+          // return type conversion
+          klassOop arg_klass = NULL;
+          arglist[0] = make_parameter(src, arg_klass, -1, CHECK);  // return value
+          arglist[1] = ArgToken();                                 // sentinel
+          (void) make_invoke(NULL, iid, Bytecodes::_invokestatic, false, 1, &arglist[0], CHECK);
+        }
+      } else {
+        // Nothing to do.
+      }
+    } else if (src == T_OBJECT && is_java_primitive(dst)) {
+      // ref-to-prim: discard ref, push zero
+      lose("requested ref-to-prim conversion not expected", CHECK);
+    } else {
+      lose("requested raw conversion not allowed", CHECK);
+    }
+  }
+}
+
+
+// -----------------------------------------------------------------------------
 // MethodHandleCompiler
 
 MethodHandleCompiler::MethodHandleCompiler(Handle root, methodHandle callee, int invoke_count, bool is_invokedynamic, TRAPS)
@@ -719,6 +792,7 @@
   case Bytecodes::_astore_1:
   case Bytecodes::_astore_2:
   case Bytecodes::_astore_3:
+  case Bytecodes::_iand:
   case Bytecodes::_i2l:
   case Bytecodes::_i2f:
   case Bytecodes::_i2d:
@@ -945,7 +1019,11 @@
     break;
 
   default:
-    ShouldNotReachHere();
+    if (op == Bytecodes::_illegal)
+      lose("no such primitive conversion", THREAD);
+    else
+      lose("bad primitive conversion op", THREAD);
+    return make_prim_constant(type, &zero_jvalue, THREAD);
   }
 
   return make_parameter(type, tk, index, THREAD);
@@ -956,7 +1034,9 @@
 // MethodHandleCompiler
 //
 
-static jvalue zero_jvalue;
+// Values used by the compiler.
+jvalue MethodHandleCompiler::zero_jvalue = { 0 };
+jvalue MethodHandleCompiler::one_jvalue  = { 1 };
 
 // Emit bytecodes for the given invoke instruction.
 MethodHandleWalker::ArgToken
@@ -964,18 +1044,18 @@
                                   Bytecodes::Code op, bool tailcall,
                                   int argc, MethodHandleWalker::ArgToken* argv,
                                   TRAPS) {
+  ArgToken zero;
   if (m == NULL) {
     // Get the intrinsic methodOop.
     m = vmIntrinsics::method_for(iid);
     if (m == NULL) {
-      ArgToken zero;
       lose(vmIntrinsics::name_at(iid), CHECK_(zero));
     }
   }
 
-  klassOop  klass   = m->method_holder();
-  Symbol* name      = m->name();
-  Symbol* signature = m->signature();
+  klassOop klass     = m->method_holder();
+  Symbol*  name      = m->name();
+  Symbol*  signature = m->signature();
 
   if (tailcall) {
     // Actually, in order to make these methods more recognizable,
@@ -1041,7 +1121,6 @@
     if (rbt != _rtype) {
       if (rbt == T_VOID) {
         // push a zero of the right sort
-        ArgToken zero;
         if (_rtype == T_OBJECT) {
           zero = make_oop_constant(NULL, CHECK_(zero));
         } else {
@@ -1051,9 +1130,27 @@
       } else if (_rtype == T_VOID) {
         // We'll emit a _return with something on the stack.
         // It's OK to ignore what's on the stack.
+      } else if (rbt == T_INT && is_subword_type(_rtype)) {
+        // Convert value to match return type.
+        switch (_rtype) {
+        case T_BOOLEAN: {
+          // boolean is treated as a one-bit unsigned integer.
+          // Cf. API documentation: java/lang/invoke/MethodHandles.html#explicitCastArguments
+          ArgToken one = make_prim_constant(T_INT, &one_jvalue, CHECK_(zero));
+          emit_load_constant(one);
+          emit_bc(Bytecodes::_iand);
+          break;
+        }
+        case T_BYTE:    emit_bc(Bytecodes::_i2b); break;
+        case T_CHAR:    emit_bc(Bytecodes::_i2c); break;
+        case T_SHORT:   emit_bc(Bytecodes::_i2s); break;
+        default: ShouldNotReachHere();
+        }
+      } else if (is_subword_type(rbt) && (is_subword_type(_rtype) || (_rtype == T_INT))) {
+        // The subword type was returned as an int and will be passed
+        // on as an int.
       } else {
-        tty->print_cr("*** rbt=%d != rtype=%d", rbt, _rtype);
-        assert(false, "IMPLEMENT ME");
+        lose("unknown conversion", CHECK_(zero));
       }
     }
     switch (_rtype) {
@@ -1216,17 +1313,17 @@
   typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
   m->set_exception_table(exception_handlers());
 
-  // Set the invocation counter's count to the invoke count of the
-  // original call site.
-  InvocationCounter* ic = m->invocation_counter();
-  ic->set(InvocationCounter::wait_for_compile, _invoke_count);
-
   // Rewrite the method and set up the constant pool cache.
   objArrayOop m_array = oopFactory::new_system_objArray(1, CHECK_(empty));
   objArrayHandle methods(THREAD, m_array);
   methods->obj_at_put(0, m());
   Rewriter::rewrite(_target_klass(), cpool, methods, CHECK_(empty));  // Use fake class.
 
+  // Set the invocation counter's count to the invoke count of the
+  // original call site.
+  InvocationCounter* ic = m->invocation_counter();
+  ic->set(InvocationCounter::wait_for_compile, _invoke_count);
+
   // Create a new MDO
   {
     methodDataOop mdo = oopFactory::new_methodData(m, CHECK_(empty));
@@ -1235,10 +1332,12 @@
 
     // Iterate over all profile data and set the count of the counter
     // data entries to the original call site counter.
-    for (ProfileData* pd = mdo->first_data(); mdo->is_valid(pd); pd = mdo->next_data(pd)) {
-      if (pd->is_CounterData()) {
-        CounterData* cd = pd->as_CounterData();
-        cd->set_count(_invoke_count);
+    for (ProfileData* profile_data = mdo->first_data();
+         mdo->is_valid(profile_data);
+         profile_data = mdo->next_data(profile_data)) {
+      if (profile_data->is_CounterData()) {
+        CounterData* counter_data = profile_data->as_CounterData();
+        counter_data->set_count(_invoke_count);
       }
     }
   }
@@ -1257,7 +1356,6 @@
 
 #ifndef PRODUCT
 
-#if 0
 // MH printer for debugging.
 
 class MethodHandlePrinter : public MethodHandleWalker {
@@ -1265,6 +1363,7 @@
   outputStream* _out;
   bool          _verbose;
   int           _temp_num;
+  int           _param_state;
   stringStream  _strbuf;
   const char* strbuf() {
     const char* s = _strbuf.as_string();
@@ -1272,14 +1371,21 @@
     return s;
   }
   ArgToken token(const char* str) {
-    return (ArgToken) str;
+    jvalue string_con;
+    string_con.j = (intptr_t) str;
+    return ArgToken(tt_symbolic, T_LONG, string_con);
+  }
+  const char* string(ArgToken token) {
+    return (const char*) (intptr_t) token.get_jlong();
   }
   void start_params() {
+    _param_state <<= 1;
     _out->print("(");
   }
   void end_params() {
     if (_verbose)  _out->print("\n");
     _out->print(") => {");
+    _param_state >>= 1;
   }
   void put_type_name(BasicType type, klassOop tk, outputStream* s) {
     const char* kname = NULL;
@@ -1299,9 +1405,10 @@
 
 public:
   MethodHandlePrinter(Handle root, bool verbose, outputStream* out, TRAPS)
-    : MethodHandleWalker(root, THREAD),
+    : MethodHandleWalker(root, false, THREAD),
       _out(out),
       _verbose(verbose),
+      _param_state(0),
       _temp_num(0)
   {
     start_params();
@@ -1309,9 +1416,10 @@
   virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
     if (argnum < 0) {
       end_params();
-      return NULL;
+      return token("return");
     }
-    if (argnum == 0) {
+    if ((_param_state & 1) == 0) {
+      _param_state |= 1;
       _out->print(_verbose ? "\n  " : "");
     } else {
       _out->print(_verbose ? ",\n  " : ", ");
@@ -1341,8 +1449,15 @@
     java_lang_boxing_object::print(type, con, &_strbuf);
     return maybe_make_temp("constant", type, "k");
   }
-  virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS) {
-    _strbuf.print("%s(%s", Bytecodes::name(op), (const char*)src);
+  void print_bytecode_name(Bytecodes::Code op) {
+    if (Bytecodes::is_defined(op))
+      _strbuf.print("%s", Bytecodes::name(op));
+    else
+      _strbuf.print("bytecode_%d", (int) op);
+  }
+  virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS) {
+    print_bytecode_name(op);
+    _strbuf.print("(%s", string(src));
     if (tk != NULL) {
       _strbuf.print(", ");
       put_type_name(type, tk, &_strbuf);
@@ -1350,8 +1465,8 @@
     _strbuf.print(")");
     return maybe_make_temp("convert", type, "v");
   }
-  virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS) {
-    _strbuf.print("%s(%s, %s", Bytecodes::name(op), (const char*)base, (const char*)offset);
+  virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS) {
+    _strbuf.print("%s(%s, %s", Bytecodes::name(op), string(base), string(offset));
     if (tk != NULL) {
       _strbuf.print(", ");
       put_type_name(type, tk, &_strbuf);
@@ -1362,7 +1477,8 @@
   virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid,
                                Bytecodes::Code op, bool tailcall,
                                int argc, ArgToken* argv, TRAPS) {
-    Symbol* name, sig;
+    Symbol* name;
+    Symbol* sig;
     if (m != NULL) {
       name = m->name();
       sig  = m->signature();
@@ -1372,7 +1488,7 @@
     }
     _strbuf.print("%s %s%s(", Bytecodes::name(op), name->as_C_string(), sig->as_C_string());
     for (int i = 0; i < argc; i++) {
-      _strbuf.print("%s%s", (i > 0 ? ", " : ""), (const char*)argv[i]);
+      _strbuf.print("%s%s", (i > 0 ? ", " : ""), string(argv[i]));
     }
     _strbuf.print(")");
     if (!tailcall) {
@@ -1410,24 +1526,20 @@
     if (HAS_PENDING_EXCEPTION) {
       oop ex = PENDING_EXCEPTION;
       CLEAR_PENDING_EXCEPTION;
-      out->print("\n*** ");
-      if (ex != Universe::virtual_machine_error_instance())
-        ex->print_on(out);
-      else
-        out->print("lose: %s", printer.lose_message());
-      out->print("\n}\n");
+      out->print(" *** ");
+      if (printer.lose_message() != NULL)  out->print("%s ", printer.lose_message());
+      out->print("}");
     }
     out->print("\n");
   }
 };
-#endif // 0
 
 extern "C"
 void print_method_handle(oop mh) {
   if (!mh->is_oop()) {
-    tty->print_cr("*** not a method handle: "INTPTR_FORMAT, (intptr_t)mh);
+    tty->print_cr("*** not a method handle: "PTR_FORMAT, (intptr_t)mh);
   } else if (java_lang_invoke_MethodHandle::is_instance(mh)) {
-    //MethodHandlePrinter::print(mh);
+    MethodHandlePrinter::print(mh);
   } else {
     tty->print("*** not a method handle: ");
     mh->print();

--- a/hotspot/src/share/vm/prims/methodHandleWalk.hpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/share/vm/prims/methodHandleWalk.hpp	Thu May 12 14:04:48 2011 -0700
@@ -113,6 +113,7 @@
     tt_parameter,
     tt_temporary,
     tt_constant,
+    tt_symbolic,
     tt_illegal
   };
 
@@ -164,6 +165,10 @@
   bool              _for_invokedynamic;
   int               _local_index;
 
+  // This array is kept in an unusual order, indexed by low-level "slot number".
+  // TOS is always _outgoing.at(0), so simple pushes and pops shift the whole _outgoing array.
+  // If there is a receiver in the current argument list, it is at _outgoing.at(_outgoing.length()-1).
+  // If a value at _outgoing.at(n) is T_LONG or T_DOUBLE, the value at _outgoing.at(n+1) is T_VOID.
   GrowableArray<SlotState> _outgoing;       // current outgoing parameter slots
   int                      _outgoing_argc;  // # non-empty outgoing slots
 
@@ -173,6 +178,11 @@
   // Insert or delete a second empty slot as needed.
   void change_argument(BasicType old_type, int slot, BasicType new_type, const ArgToken& new_arg);
 
+  // Raw retype conversions for OP_RAW_RETYPE.
+  void retype_raw_conversion(BasicType src, BasicType dst, bool for_return, int slot, TRAPS);
+  void retype_raw_argument_type(BasicType src, BasicType dst, int slot, TRAPS) { retype_raw_conversion(src, dst, false, slot, CHECK); }
+  void retype_raw_return_type(  BasicType src, BasicType dst,           TRAPS) { retype_raw_conversion(src, dst, true,  -1,   CHECK); }
+
   SlotState* slot_state(int slot) {
     if (slot < 0 || slot >= _outgoing.length())
       return NULL;
@@ -221,12 +231,12 @@
   int max_locals() const { return _local_index; }
 
   // plug-in abstract interpretation steps:
-  virtual ArgToken make_parameter( BasicType type, klassOop tk, int argnum, TRAPS ) = 0;
-  virtual ArgToken make_prim_constant( BasicType type, jvalue* con, TRAPS ) = 0;
-  virtual ArgToken make_oop_constant( oop con, TRAPS ) = 0;
-  virtual ArgToken make_conversion( BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS ) = 0;
-  virtual ArgToken make_fetch( BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS ) = 0;
-  virtual ArgToken make_invoke( methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS ) = 0;
+  virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) = 0;
+  virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) = 0;
+  virtual ArgToken make_oop_constant(oop con, TRAPS) = 0;
+  virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS) = 0;
+  virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS) = 0;
+  virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS) = 0;
 
   // For make_invoke, the methodOop can be NULL if the intrinsic ID
   // is something other than vmIntrinsics::_none.
@@ -253,6 +263,10 @@
   KlassHandle  _target_klass;
   Thread*      _thread;
 
+  // Values used by the compiler.
+  static jvalue zero_jvalue;
+  static jvalue one_jvalue;
+
   // Fake constant pool entry.
   class ConstantValue {
   private:
@@ -417,7 +431,7 @@
   methodHandle get_method_oop(TRAPS) const;
 
 public:
-  MethodHandleCompiler(Handle root, methodHandle call_method, int invoke_count, bool for_invokedynamic, TRAPS);
+  MethodHandleCompiler(Handle root, methodHandle callee, int invoke_count, bool for_invokedynamic, TRAPS);
 
   // Compile the given MH chain into bytecode.
   methodHandle compile(TRAPS);

--- a/hotspot/src/share/vm/prims/methodHandles.cpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/share/vm/prims/methodHandles.cpp	Thu May 12 14:04:48 2011 -0700
@@ -1099,6 +1099,14 @@
   return Klass::cast(SystemDictionary::Object_klass())->java_mirror();
 }
 
+bool MethodHandles::is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst) {
+  if (src == T_FLOAT)   return dst == T_INT;
+  if (src == T_INT)     return dst == T_FLOAT;
+  if (src == T_DOUBLE)  return dst == T_LONG;
+  if (src == T_LONG)    return dst == T_DOUBLE;
+  return false;
+}
+
 bool MethodHandles::same_basic_type_for_arguments(BasicType src,
                                                   BasicType dst,
                                                   bool raw,
@@ -1125,10 +1133,8 @@
       return true;            // remaining case: byte fits in short
   }
   // allow float/fixed reinterpretation casts
-  if (src == T_FLOAT)   return dst == T_INT;
-  if (src == T_INT)     return dst == T_FLOAT;
-  if (src == T_DOUBLE)  return dst == T_LONG;
-  if (src == T_LONG)    return dst == T_DOUBLE;
+  if (is_float_fixed_reinterpretation_cast(src, dst))
+    return true;
   return false;
 }
 
@@ -1399,7 +1405,7 @@
                                                       int argnum,
                                                       bool raw) {
   const char* err = NULL;
-  bool for_return = (argnum < 0);
+  const bool for_return = (argnum < 0);
 
   // just in case:
   if (src_type == T_ARRAY)  src_type = T_OBJECT;
@@ -1408,17 +1414,17 @@
   // Produce some nice messages if VerifyMethodHandles is turned on:
   if (!same_basic_type_for_arguments(src_type, dst_type, raw, for_return)) {
     if (src_type == T_OBJECT) {
-      if (raw && dst_type == T_INT && is_always_null_type(src_klass))
-        return NULL;    // OK to convert a null pointer to a garbage int
-      err = ((argnum >= 0)
+      if (raw && is_java_primitive(dst_type))
+        return NULL;    // ref-to-prim discards ref and returns zero
+      err = (!for_return
              ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s"
              : "type mismatch: returning a %s, but caller expects primitive %s");
     } else if (dst_type == T_OBJECT) {
-      err = ((argnum >= 0)
+      err = (!for_return
              ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s"
              : "type mismatch: returning a primitive %s, but caller expects %s");
     } else {
-      err = ((argnum >= 0)
+      err = (!for_return
              ? "type mismatch: passing a %s for method argument #%d, which expects %s"
              : "type mismatch: returning a %s, but caller expects %s");
     }
@@ -1427,11 +1433,11 @@
     if (!class_cast_needed(dst_klass, src_klass)) {
       if (raw)
         return NULL;    // reverse cast is OK; the MH target is trusted to enforce it
-      err = ((argnum >= 0)
+      err = (!for_return
              ? "cast required: passing a %s for method argument #%d, which expects %s"
              : "cast required: returning a %s, but caller expects %s");
     } else {
-      err = ((argnum >= 0)
+      err = (!for_return
              ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
              : "reference mismatch: returning a %s, but caller expects %s");
     }
@@ -1452,7 +1458,7 @@
 
   size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11);
   char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1);
-  if (argnum >= 0) {
+  if (!for_return) {
     assert(strstr(err, "%d") != NULL, "");
     jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
   } else {
@@ -2180,9 +2186,10 @@
 }
 
 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
-  int  argslot    = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
-  jint conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
-  jint conv_op    = adapter_conversion_op(conversion);
+  Handle argument   = java_lang_invoke_AdapterMethodHandle::argument(mh());
+  int    argslot    = java_lang_invoke_AdapterMethodHandle::vmargslot(mh());
+  jint   conversion = java_lang_invoke_AdapterMethodHandle::conversion(mh());
+  jint   conv_op    = adapter_conversion_op(conversion);
 
   // adjust the adapter code to the internal EntryKind enumeration:
   EntryKind ek_orig = adapter_entry_kind(conv_op);
@@ -2241,7 +2248,7 @@
         } else if (src == T_DOUBLE && dest == T_FLOAT) {
           ek_opt = _adapter_opt_d2f;
         } else {
-          assert(false, "");
+          goto throw_not_impl;        // runs user code, hence could block
         }
         break;
       case 1 *4+ 2:
@@ -2250,11 +2257,11 @@
         } else if (src == T_FLOAT && dest == T_DOUBLE) {
           ek_opt = _adapter_opt_f2d;
         } else {
-          assert(false, "");
+          goto throw_not_impl;        // runs user code, hence could block
         }
         break;
       default:
-        assert(false, "");
+        goto throw_not_impl;        // runs user code, hence could block
         break;
       }
     }
@@ -2271,7 +2278,7 @@
         ek_opt = _adapter_opt_unboxl;
         break;
       default:
-        assert(false, "");
+        goto throw_not_impl;
         break;
       }
     }
@@ -2284,6 +2291,9 @@
       vminfo = argslot;
       ek_opt = _adapter_opt_collect_ref;
       ensure_vmlayout_field(target, CHECK);
+      // for MethodHandleWalk:
+      if (java_lang_invoke_AdapterMethodHandle::is_instance(argument()))
+        ensure_vmlayout_field(argument, CHECK);
       if (!OptimizeMethodHandles)  break;
       switch (type2size[src]) {
       case 1:
@@ -2311,7 +2321,7 @@
         ek_opt = _adapter_opt_collect_2_ref;
         break;
       default:
-        assert(false, "");
+        goto throw_not_impl;
         break;
       }
     }
@@ -2335,7 +2345,7 @@
                   rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
         break;
       default:
-        assert(false, "");
+        goto throw_not_impl;
         break;
       }
     }
@@ -2402,12 +2412,11 @@
   case _adapter_collect_args:
     {
       assert(UseRicochetFrames, "else don't come here");
-      int elem_slots = argument_slot_count(
-                           java_lang_invoke_MethodHandle::type(
-                               java_lang_invoke_AdapterMethodHandle::argument(mh()) ) );
+      int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
       // vminfo will be the location to insert the return value
       vminfo = argslot;
       ensure_vmlayout_field(target, CHECK);
+      ensure_vmlayout_field(argument, CHECK);
 
       // general case:
       switch (dest) {
@@ -2472,12 +2481,11 @@
   case _adapter_fold_args:
     {
       assert(UseRicochetFrames, "else don't come here");
-      int elem_slots = argument_slot_count(
-                           java_lang_invoke_MethodHandle::type(
-                               java_lang_invoke_AdapterMethodHandle::argument(mh()) ) );
+      int elem_slots = argument_slot_count(java_lang_invoke_MethodHandle::type(argument()));
       // vminfo will be the location to insert the return value
       vminfo = argslot + elem_slots;
       ensure_vmlayout_field(target, CHECK);
+      ensure_vmlayout_field(argument, CHECK);
 
       switch (dest) {
       default       : if (!is_subword_type(dest))  goto throw_not_impl;
@@ -2527,15 +2535,31 @@
     break;
   }
 
-  if (err != NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) {
+  if (err == NULL && (vminfo & CONV_VMINFO_MASK) != vminfo) {
     // should not happen, since vminfo is used to encode arg/slot indexes < 255
     err = "vminfo overflow";
   }
 
-  if (err != NULL && !have_entry(ek_opt)) {
+  if (err == NULL && !have_entry(ek_opt)) {
     err = "adapter stub for this kind of method handle is missing";
   }
 
+  if (err == NULL && ek_opt == ek_orig) {
+    switch (ek_opt) {
+    case _adapter_prim_to_prim:
+    case _adapter_ref_to_prim:
+    case _adapter_prim_to_ref:
+    case _adapter_swap_args:
+    case _adapter_rot_args:
+    case _adapter_collect_args:
+    case _adapter_fold_args:
+    case _adapter_spread_args:
+      // should be handled completely by optimized cases; see above
+      err = "init_AdapterMethodHandle should not issue this";
+      break;
+    }
+  }
+
   if (err != NULL) {
     throw_InternalError_for_bad_conversion(conversion, err, THREAD);
     return;

--- a/hotspot/src/share/vm/prims/methodHandles.hpp	Thu May 12 10:33:17 2011 -0700
+++ b/hotspot/src/share/vm/prims/methodHandles.hpp	Thu May 12 14:04:48 2011 -0700
@@ -698,6 +698,8 @@
                                               KlassHandle receiver_klass,
                                               TRAPS);
 
+public:
+  static bool is_float_fixed_reinterpretation_cast(BasicType src, BasicType dst);
   static bool same_basic_type_for_arguments(BasicType src, BasicType dst,
                                             bool raw = false,
                                             bool for_return = false);