changeset 689:e5b0439ef4ae

6655638: dynamic languages need method handles Summary: initial implementation, with known omissions (x86/64, sparc, compiler optim., c-oops, C++ interp.) Reviewed-by: kvn, twisti, never
author jrose
date Wed, 08 Apr 2009 10:56:49 -0700
parents 1d037ecd7960
children 9610b2a8ab4e
files src/cpu/sparc/vm/assembler_sparc.cpp src/cpu/sparc/vm/assembler_sparc.hpp src/cpu/sparc/vm/assembler_sparc.inline.hpp src/cpu/sparc/vm/cppInterpreter_sparc.cpp src/cpu/sparc/vm/interpreterGenerator_sparc.hpp src/cpu/sparc/vm/interpreter_sparc.cpp src/cpu/sparc/vm/methodHandles_sparc.cpp src/cpu/sparc/vm/register_definitions_sparc.cpp src/cpu/sparc/vm/sharedRuntime_sparc.cpp src/cpu/sparc/vm/templateInterpreter_sparc.cpp src/cpu/x86/vm/assembler_x86.cpp src/cpu/x86/vm/assembler_x86.hpp src/cpu/x86/vm/cppInterpreter_x86.cpp src/cpu/x86/vm/interp_masm_x86_32.cpp src/cpu/x86/vm/interp_masm_x86_32.hpp src/cpu/x86/vm/interp_masm_x86_64.cpp src/cpu/x86/vm/interp_masm_x86_64.hpp src/cpu/x86/vm/interpreterGenerator_x86.hpp src/cpu/x86/vm/interpreter_x86_32.cpp src/cpu/x86/vm/interpreter_x86_64.cpp src/cpu/x86/vm/methodHandles_x86.cpp src/cpu/x86/vm/stubGenerator_x86_32.cpp src/cpu/x86/vm/templateInterpreter_x86_32.cpp src/cpu/x86/vm/templateInterpreter_x86_64.cpp src/share/vm/ci/ciMethod.cpp src/share/vm/ci/ciMethod.hpp src/share/vm/classfile/classFileParser.cpp src/share/vm/classfile/classFileParser.hpp src/share/vm/classfile/dictionary.cpp src/share/vm/classfile/dictionary.hpp src/share/vm/classfile/javaClasses.cpp src/share/vm/classfile/javaClasses.hpp src/share/vm/classfile/systemDictionary.cpp src/share/vm/classfile/systemDictionary.hpp src/share/vm/classfile/vmSymbols.hpp src/share/vm/includeDB_core src/share/vm/includeDB_gc_parallel src/share/vm/interpreter/abstractInterpreter.hpp src/share/vm/interpreter/cppInterpreter.cpp src/share/vm/interpreter/interpreter.cpp src/share/vm/interpreter/interpreterRuntime.cpp src/share/vm/interpreter/interpreterRuntime.hpp src/share/vm/interpreter/linkResolver.cpp src/share/vm/interpreter/linkResolver.hpp src/share/vm/interpreter/templateInterpreter.cpp src/share/vm/interpreter/templateInterpreter.hpp src/share/vm/interpreter/templateInterpreterGenerator.hpp src/share/vm/memory/dump.cpp src/share/vm/oops/methodKlass.cpp src/share/vm/oops/methodOop.cpp src/share/vm/oops/methodOop.hpp src/share/vm/oops/oop.hpp src/share/vm/oops/oop.inline.hpp src/share/vm/prims/methodHandles.cpp src/share/vm/prims/methodHandles.hpp src/share/vm/prims/nativeLookup.cpp src/share/vm/runtime/arguments.cpp src/share/vm/runtime/globals.hpp src/share/vm/runtime/sharedRuntime.cpp src/share/vm/runtime/sharedRuntime.hpp src/share/vm/utilities/accessFlags.hpp src/share/vm/utilities/exceptions.hpp src/share/vm/utilities/globalDefinitions.hpp
diffstat 63 files changed, 5815 insertions(+), 70 deletions(-) [+]
line wrap: on
line diff
--- a/src/cpu/sparc/vm/assembler_sparc.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/assembler_sparc.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -3029,6 +3029,58 @@
 
 
 
+void MacroAssembler::check_method_handle_type(Register mtype_reg, Register mh_reg,
+                                              Register temp_reg,
+                                              Label& wrong_method_type) {
+  assert_different_registers(mtype_reg, mh_reg, temp_reg);
+  // compare method type against that of the receiver
+  RegisterOrConstant mhtype_offset = delayed_value(java_dyn_MethodHandle::type_offset_in_bytes, temp_reg);
+  ld_ptr(mh_reg, mhtype_offset, temp_reg);
+  cmp(temp_reg, mtype_reg);
+  br(Assembler::notEqual, false, Assembler::pn, wrong_method_type);
+  delayed()->nop();
+}
+
+
+void MacroAssembler::jump_to_method_handle_entry(Register mh_reg, Register temp_reg) {
+  assert(mh_reg == G3_method_handle, "caller must put MH object in G3");
+  assert_different_registers(mh_reg, temp_reg);
+
+  // pick out the interpreted side of the handler
+  ld_ptr(mh_reg, delayed_value(java_dyn_MethodHandle::vmentry_offset_in_bytes, temp_reg), temp_reg);
+
+  // off we go...
+  ld_ptr(temp_reg, MethodHandleEntry::from_interpreted_entry_offset_in_bytes(), temp_reg);
+  jmp(temp_reg, 0);
+
+  // for the various stubs which take control at this point,
+  // see MethodHandles::generate_method_handle_stub
+
+  // (Can any caller use this delay slot?  If so, add an option for supression.)
+  delayed()->nop();
+}
+
+RegisterOrConstant MacroAssembler::argument_offset(RegisterOrConstant arg_slot,
+                                                   int extra_slot_offset) {
+  // cf. TemplateTable::prepare_invoke(), if (load_receiver).
+  int stackElementSize = Interpreter::stackElementWords() * wordSize;
+  int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0);
+  int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1);
+  assert(offset1 - offset == stackElementSize, "correct arithmetic");
+  if (arg_slot.is_constant()) {
+    offset += arg_slot.as_constant() * stackElementSize;
+    return offset;
+  } else {
+    Register temp = arg_slot.as_register();
+    sll_ptr(temp, exact_log2(stackElementSize), temp);
+    if (offset != 0)
+      add(temp, offset, temp);
+    return temp;
+  }
+}
+
+
+
 void MacroAssembler::biased_locking_enter(Register obj_reg, Register mark_reg,
                                           Register temp_reg,
                                           Label& done, Label* slow_case,
--- a/src/cpu/sparc/vm/assembler_sparc.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/assembler_sparc.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -84,6 +84,10 @@
 
 REGISTER_DECLARATION(Register, Gtemp  , G5);
 
+// JSR 292 fixed register usages:
+REGISTER_DECLARATION(Register, G5_method_type        , G5);
+REGISTER_DECLARATION(Register, G3_method_handle      , G3);
+
 // The compiler requires that G5_megamorphic_method is G5_inline_cache_klass,
 // because a single patchable "set" instruction (NativeMovConstReg,
 // or NativeMovConstPatching for compiler1) instruction
@@ -91,9 +95,13 @@
 // call site is an inline cache or is megamorphic.  See the function
 // CompiledIC::set_to_megamorphic.
 //
-// On the other hand, G5_inline_cache_klass must differ from G5_method,
-// because both registers are needed for an inline cache that calls
-// an interpreted method.
+// If a inline cache targets an interpreted method, then the
+// G5 register will be used twice during the call.  First,
+// the call site will be patched to load a compiledICHolder
+// into G5. (This is an ordered pair of ic_klass, method.)
+// The c2i adapter will first check the ic_klass, then load
+// G5_method with the method part of the pair just before
+// jumping into the interpreter.
 //
 // Note that G5_method is only the method-self for the interpreter,
 // and is logically unrelated to G5_megamorphic_method.
@@ -1931,6 +1939,7 @@
   inline void store_ptr_contents( Register s, Address& a, int offset = 0 );
   inline void jumpl_to( Address& a, Register d, int offset = 0 );
   inline void jump_to(  Address& a,             int offset = 0 );
+  inline void jump_indirect_to(  Address& a, Register temp, int ld_offset = 0, int jmp_offset = 0 );
 
   // ring buffer traceable jumps
 
@@ -2366,6 +2375,16 @@
                            Register temp2_reg,
                            Label& L_success);
 
+  // method handles (JSR 292)
+  void check_method_handle_type(Register mtype_reg, Register mh_reg,
+                                Register temp_reg,
+                                Label& wrong_method_type);
+  void jump_to_method_handle_entry(Register mh_reg, Register temp_reg);
+  // offset relative to Gargs of argument at tos[arg_slot].
+  // (arg_slot == 0 means the last argument, not the first).
+  RegisterOrConstant argument_offset(RegisterOrConstant arg_slot,
+                                     int extra_slot_offset = 0);
+
 
   // Stack overflow checking
 
--- a/src/cpu/sparc/vm/assembler_sparc.inline.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/assembler_sparc.inline.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -671,6 +671,15 @@
 }
 
 
+inline void MacroAssembler::jump_indirect_to(  Address& a, Register temp,
+                                               int ld_offset, int jmp_offset ) {
+  assert_not_delayed();
+  //sethi(a);                   // sethi is caller responsibility for this one
+  ld_ptr(a, temp, ld_offset);
+  jmp(temp, jmp_offset);
+}
+
+
 inline void MacroAssembler::set_oop( jobject obj, Register d ) {
   set_oop(allocate_oop_address(obj, d));
 }
--- a/src/cpu/sparc/vm/cppInterpreter_sparc.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/cppInterpreter_sparc.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2007-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2007-2009 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
@@ -1017,6 +1017,7 @@
   const int slop_factor = 2*wordSize;
 
   const int fixed_size = ((sizeof(BytecodeInterpreter) + slop_factor) >> LogBytesPerWord) + // what is the slop factor?
+                         //6815692//methodOopDesc::extra_stack_words() +  // extra push slots for MH adapters
                          frame::memory_parameter_word_sp_offset +  // register save area + param window
                          (native ?  frame::interpreter_frame_extra_outgoing_argument_words : 0); // JNI, class
 
@@ -1163,6 +1164,9 @@
   __ st_ptr(O2, XXX_STATE(_stack));                // PREPUSH
 
   __ lduh(max_stack, O3);                      // Full size expression stack
+  guarantee(!EnableMethodHandles, "no support yet for java.dyn.MethodHandle"); //6815692
+  //6815692//if (EnableMethodHandles)
+  //6815692//  __ inc(O3, methodOopDesc::extra_stack_entries());
   __ sll(O3, LogBytesPerWord, O3);
   __ sub(O2, O3, O3);
 //  __ sub(O3, wordSize, O3);                    // so prepush doesn't look out of bounds
@@ -2017,7 +2021,9 @@
 
   const int fixed_size = sizeof(BytecodeInterpreter)/wordSize +           // interpreter state object
                          frame::memory_parameter_word_sp_offset;   // register save area + param window
+  const int extra_stack = 0; //6815692//methodOopDesc::extra_stack_entries();
   return (round_to(max_stack +
+                   extra_stack +
                    slop_factor +
                    fixed_size +
                    monitor_size +
@@ -2104,7 +2110,8 @@
   // Need +1 here because stack_base points to the word just above the first expr stack entry
   // and stack_limit is supposed to point to the word just below the last expr stack entry.
   // See generate_compute_interpreter_state.
-  to_fill->_stack_limit = stack_base - (method->max_stack() + 1);
+  int extra_stack = 0; //6815692//methodOopDesc::extra_stack_entries();
+  to_fill->_stack_limit = stack_base - (method->max_stack() + 1 + extra_stack);
   to_fill->_monitor_base = (BasicObjectLock*) monitor_base;
 
   // sparc specific
--- a/src/cpu/sparc/vm/interpreterGenerator_sparc.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/interpreterGenerator_sparc.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -29,6 +29,7 @@
   address generate_normal_entry(bool synchronized);
   address generate_native_entry(bool synchronized);
   address generate_abstract_entry(void);
+  address generate_method_handle_entry(void);
   address generate_math_entry(AbstractInterpreter::MethodKind kind);
   address generate_empty_entry(void);
   address generate_accessor_entry(void);
--- a/src/cpu/sparc/vm/interpreter_sparc.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/interpreter_sparc.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -235,6 +235,19 @@
 }
 
 
+
+// Method handle invoker
+// Dispatch a method of the form java.dyn.MethodHandles::invoke(...)
+address InterpreterGenerator::generate_method_handle_entry(void) {
+  if (!EnableMethodHandles) {
+    return generate_abstract_entry();
+  }
+  return generate_abstract_entry(); //6815692//
+}
+
+
+
+
 //----------------------------------------------------------------------------------------------------
 // Entry points & stack frame layout
 //
@@ -364,6 +377,7 @@
     case Interpreter::empty                  : entry_point = ((InterpreterGenerator*)this)->generate_empty_entry();        break;
     case Interpreter::accessor               : entry_point = ((InterpreterGenerator*)this)->generate_accessor_entry();     break;
     case Interpreter::abstract               : entry_point = ((InterpreterGenerator*)this)->generate_abstract_entry();     break;
+    case Interpreter::method_handle          : entry_point = ((InterpreterGenerator*)this)->generate_method_handle_entry(); break;
     case Interpreter::java_lang_math_sin     :                                                                             break;
     case Interpreter::java_lang_math_cos     :                                                                             break;
     case Interpreter::java_lang_math_tan     :                                                                             break;
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cpu/sparc/vm/methodHandles_sparc.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -0,0 +1,70 @@
+/*
+ * Copyright 1997-2009 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.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_methodHandles_sparc.cpp.incl"
+
+#define __ _masm->
+
+address MethodHandleEntry::start_compiled_entry(MacroAssembler* _masm,
+                                                address interpreted_entry) {
+  __ align(wordSize);
+  address target = __ pc() + sizeof(Data);
+  while (__ pc() < target) {
+    __ nop();
+    __ align(wordSize);
+  }
+
+  MethodHandleEntry* me = (MethodHandleEntry*) __ pc();
+  me->set_end_address(__ pc());         // set a temporary end_address
+  me->set_from_interpreted_entry(interpreted_entry);
+  me->set_type_checking_entry(NULL);
+
+  return (address) me;
+}
+
+MethodHandleEntry* MethodHandleEntry::finish_compiled_entry(MacroAssembler* _masm,
+                                                address start_addr) {
+  MethodHandleEntry* me = (MethodHandleEntry*) start_addr;
+  assert(me->end_address() == start_addr, "valid ME");
+
+  // Fill in the real end_address:
+  __ align(wordSize);
+  me->set_end_address(__ pc());
+
+  return me;
+}
+
+
+// Code generation
+address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm) {
+  ShouldNotReachHere(); //NYI, 6815692
+  return NULL;
+}
+
+// Generate an "entry" field for a method handle.
+// This determines how the method handle will respond to calls.
+void MethodHandles::generate_method_handle_stub(MacroAssembler* _masm, MethodHandles::EntryKind ek) {
+  ShouldNotReachHere(); //NYI, 6815692
+}
--- a/src/cpu/sparc/vm/register_definitions_sparc.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/register_definitions_sparc.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2002-2009 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
@@ -142,6 +142,8 @@
 REGISTER_DEFINITION(Register, G3_scratch);
 REGISTER_DEFINITION(Register, G4_scratch);
 REGISTER_DEFINITION(Register, Gtemp);
+REGISTER_DEFINITION(Register, G5_method_type);
+REGISTER_DEFINITION(Register, G3_method_handle);
 REGISTER_DEFINITION(Register, Lentry_args);
 
 #ifdef CC_INTERP
--- a/src/cpu/sparc/vm/sharedRuntime_sparc.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/sharedRuntime_sparc.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2009 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
@@ -937,12 +937,12 @@
   // Inputs:
   // G2_thread      - TLS
   // G5_method      - Method oop
-  // O0             - Flag telling us to restore SP from O5
-  // O4_args        - Pointer to interpreter's args
-  // O5             - Caller's saved SP, to be restored if needed
+  // G4 (Gargs)     - Pointer to interpreter's args
+  // O0..O4         - free for scratch
+  // O5_savedSP     - Caller's saved SP, to be restored if needed
   // O6             - Current SP!
   // O7             - Valid return address
-  // L0-L7, I0-I7    - Caller's temps (no frame pushed yet)
+  // L0-L7, I0-I7   - Caller's temps (no frame pushed yet)
 
   // Outputs:
   // G2_thread      - TLS
@@ -954,7 +954,7 @@
   // F0-F7          - more outgoing args
 
 
-  // O4 is about to get loaded up with compiled callee's args
+  // Gargs is the incoming argument base, and also an outgoing argument.
   __ sub(Gargs, BytesPerWord, Gargs);
 
 #ifdef ASSERT
--- a/src/cpu/sparc/vm/templateInterpreter_sparc.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/sparc/vm/templateInterpreter_sparc.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -108,6 +108,24 @@
 }
 
 
+// Arguments are: required type in G5_method_type, and
+// failing object (or NULL) in G3_method_handle.
+address TemplateInterpreterGenerator::generate_WrongMethodType_handler() {
+  address entry = __ pc();
+  // expression stack must be empty before entering the VM if an exception
+  // happened
+  __ empty_expression_stack();
+  // load exception object
+  __ call_VM(Oexception,
+             CAST_FROM_FN_PTR(address,
+                              InterpreterRuntime::throw_WrongMethodTypeException),
+             G5_method_type,    // required
+             G3_method_handle); // actual
+  __ should_not_reach_here();
+  return entry;
+}
+
+
 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler(const char* name) {
   address entry = __ pc();
   // expression stack must be empty before entering the VM if an exception happened
@@ -448,6 +466,7 @@
 
   const int extra_space =
     rounded_vm_local_words +                   // frame local scratch space
+    //6815692//methodOopDesc::extra_stack_words() +       // extra push slots for MH adapters
     frame::memory_parameter_word_sp_offset +   // register save area
     (native_call ? frame::interpreter_frame_extra_outgoing_argument_words : 0);
 
@@ -1447,6 +1466,7 @@
        round_to(callee_extra_locals * Interpreter::stackElementWords(), WordsPerLong);
   const int max_stack_words = max_stack * Interpreter::stackElementWords();
   return (round_to((max_stack_words
+                   //6815692//+ methodOopDesc::extra_stack_words()
                    + rounded_vm_local_words
                    + frame::memory_parameter_word_sp_offset), WordsPerLong)
                    // already rounded
--- a/src/cpu/x86/vm/assembler_x86.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/assembler_x86.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -7609,6 +7609,83 @@
 }
 
 
+// registers on entry:
+//  - rax ('check' register): required MethodType
+//  - rcx: method handle
+//  - rdx, rsi, or ?: killable temp
+void MacroAssembler::check_method_handle_type(Register mtype_reg, Register mh_reg,
+                                              Register temp_reg,
+                                              Label& wrong_method_type) {
+  if (UseCompressedOops)  unimplemented();  // field accesses must decode
+  // compare method type against that of the receiver
+  cmpptr(mtype_reg, Address(mh_reg, delayed_value(java_dyn_MethodHandle::type_offset_in_bytes, temp_reg)));
+  jcc(Assembler::notEqual, wrong_method_type);
+}
+
+
+// A method handle has a "vmslots" field which gives the size of its
+// argument list in JVM stack slots.  This field is either located directly
+// in every method handle, or else is indirectly accessed through the
+// method handle's MethodType.  This macro hides the distinction.
+void MacroAssembler::load_method_handle_vmslots(Register vmslots_reg, Register mh_reg,
+                                                Register temp_reg) {
+  if (UseCompressedOops)  unimplemented();  // field accesses must decode
+  // load mh.type.form.vmslots
+  if (java_dyn_MethodHandle::vmslots_offset_in_bytes() != 0) {
+    // hoist vmslots into every mh to avoid dependent load chain
+    movl(vmslots_reg, Address(mh_reg, delayed_value(java_dyn_MethodHandle::vmslots_offset_in_bytes, temp_reg)));
+  } else {
+    Register temp2_reg = vmslots_reg;
+    movptr(temp2_reg, Address(mh_reg,    delayed_value(java_dyn_MethodHandle::type_offset_in_bytes, temp_reg)));
+    movptr(temp2_reg, Address(temp2_reg, delayed_value(java_dyn_MethodType::form_offset_in_bytes, temp_reg)));
+    movl(vmslots_reg, Address(temp2_reg, delayed_value(java_dyn_MethodTypeForm::vmslots_offset_in_bytes, temp_reg)));
+  }
+}
+
+
+// registers on entry:
+//  - rcx: method handle
+//  - rdx: killable temp (interpreted only)
+//  - rax: killable temp (compiled only)
+void MacroAssembler::jump_to_method_handle_entry(Register mh_reg, Register temp_reg) {
+  assert(mh_reg == rcx, "caller must put MH object in rcx");
+  assert_different_registers(mh_reg, temp_reg);
+
+  if (UseCompressedOops)  unimplemented();  // field accesses must decode
+
+  // pick out the interpreted side of the handler
+  movptr(temp_reg, Address(mh_reg, delayed_value(java_dyn_MethodHandle::vmentry_offset_in_bytes, temp_reg)));
+
+  // off we go...
+  jmp(Address(temp_reg, MethodHandleEntry::from_interpreted_entry_offset_in_bytes()));
+
+  // for the various stubs which take control at this point,
+  // see MethodHandles::generate_method_handle_stub
+}
+
+
+Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
+                                         int extra_slot_offset) {
+  // cf. TemplateTable::prepare_invoke(), if (load_receiver).
+  int stackElementSize = Interpreter::stackElementSize();
+  int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0);
+#ifdef ASSERT
+  int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1);
+  assert(offset1 - offset == stackElementSize, "correct arithmetic");
+#endif
+  Register             scale_reg    = noreg;
+  Address::ScaleFactor scale_factor = Address::no_scale;
+  if (arg_slot.is_constant()) {
+    offset += arg_slot.as_constant() * stackElementSize;
+  } else {
+    scale_reg    = arg_slot.as_register();
+    scale_factor = Address::times(stackElementSize);
+  }
+  offset += wordSize;           // return PC is on stack
+  return Address(rsp, scale_reg, scale_factor, offset);
+}
+
+
 void MacroAssembler::verify_oop_addr(Address addr, const char* s) {
   if (!VerifyOops) return;
 
--- a/src/cpu/x86/vm/assembler_x86.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/assembler_x86.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1857,6 +1857,16 @@
                            Register temp_reg,
                            Label& L_success);
 
+  // method handles (JSR 292)
+  void check_method_handle_type(Register mtype_reg, Register mh_reg,
+                                Register temp_reg,
+                                Label& wrong_method_type);
+  void load_method_handle_vmslots(Register vmslots_reg, Register mh_reg,
+                                  Register temp_reg);
+  void jump_to_method_handle_entry(Register mh_reg, Register temp_reg);
+  Address argument_address(RegisterOrConstant arg_slot, int extra_slot_offset = 0);
+
+
   //----
   void set_word_if_not_zero(Register reg); // sets reg to 1 if not zero, otherwise 0
 
--- a/src/cpu/x86/vm/cppInterpreter_x86.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/cppInterpreter_x86.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -513,10 +513,11 @@
     // compute full expression stack limit
 
     const Address size_of_stack    (rbx, methodOopDesc::max_stack_offset());
+    const int extra_stack = 0; //6815692//methodOopDesc::extra_stack_words();
     __ load_unsigned_short(rdx, size_of_stack);                           // get size of expression stack in words
     __ negptr(rdx);                                                       // so we can subtract in next step
     // Allocate expression stack
-    __ lea(rsp, Address(rsp, rdx, Address::times_ptr));
+    __ lea(rsp, Address(rsp, rdx, Address::times_ptr, -extra_stack));
     __ movptr(STATE(_stack_limit), rsp);
   }
 
@@ -659,8 +660,9 @@
     // Always give one monitor to allow us to start interp if sync method.
     // Any additional monitors need a check when moving the expression stack
     const int one_monitor = frame::interpreter_frame_monitor_size() * wordSize;
+    const int extra_stack = 0; //6815692//methodOopDesc::extra_stack_entries();
   __ load_unsigned_short(rax, size_of_stack);                           // get size of expression stack in words
-  __ lea(rax, Address(noreg, rax, Interpreter::stackElementScale(), one_monitor));
+  __ lea(rax, Address(noreg, rax, Interpreter::stackElementScale(), extra_stack + one_monitor));
   __ lea(rax, Address(rax, rdx, Interpreter::stackElementScale(), overhead_size));
 
 #ifdef ASSERT
@@ -2185,6 +2187,7 @@
     case Interpreter::empty                  : entry_point = ((InterpreterGenerator*)this)->generate_empty_entry();        break;
     case Interpreter::accessor               : entry_point = ((InterpreterGenerator*)this)->generate_accessor_entry();     break;
     case Interpreter::abstract               : entry_point = ((InterpreterGenerator*)this)->generate_abstract_entry();     break;
+    case Interpreter::method_handle          : entry_point = ((InterpreterGenerator*)this)->generate_method_handle_entry(); break;
 
     case Interpreter::java_lang_math_sin     : // fall thru
     case Interpreter::java_lang_math_cos     : // fall thru
@@ -2224,7 +2227,8 @@
   const int overhead_size = sizeof(BytecodeInterpreter)/wordSize +
     ( frame::sender_sp_offset - frame::link_offset) + 2;
 
-  const int method_stack = (method->max_locals() + method->max_stack()) *
+  const int extra_stack = 0; //6815692//methodOopDesc::extra_stack_entries();
+  const int method_stack = (method->max_locals() + method->max_stack() + extra_stack) *
                            Interpreter::stackElementWords();
   return overhead_size + method_stack + stub_code;
 }
@@ -2289,7 +2293,8 @@
   // Need +1 here because stack_base points to the word just above the first expr stack entry
   // and stack_limit is supposed to point to the word just below the last expr stack entry.
   // See generate_compute_interpreter_state.
-  to_fill->_stack_limit = stack_base - (method->max_stack() + 1);
+  int extra_stack = 0; //6815692//methodOopDesc::extra_stack_entries();
+  to_fill->_stack_limit = stack_base - (method->max_stack() + extra_stack + 1);
   to_fill->_monitor_base = (BasicObjectLock*) monitor_base;
 
   to_fill->_self_link = to_fill;
@@ -2335,7 +2340,8 @@
                                                 monitor_size);
 
   // Now with full size expression stack
-  int full_frame_size = short_frame_size + method->max_stack() * BytesPerWord;
+  int extra_stack = 0; //6815692//methodOopDesc::extra_stack_entries();
+  int full_frame_size = short_frame_size + (method->max_stack() + extra_stack) * BytesPerWord;
 
   // and now with only live portion of the expression stack
   short_frame_size = short_frame_size + tempcount * BytesPerWord;
--- a/src/cpu/x86/vm/interp_masm_x86_32.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/interp_masm_x86_32.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -555,13 +555,18 @@
 }
 
 
-// Jump to from_interpreted entry of a call unless single stepping is possible
-// in this thread in which case we must call the i2i entry
-void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
+void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() {
   // set sender sp
   lea(rsi, Address(rsp, wordSize));
   // record last_sp
   movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), rsi);
+}
+
+
+// Jump to from_interpreted entry of a call unless single stepping is possible
+// in this thread in which case we must call the i2i entry
+void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
+  prepare_to_jump_from_interpreted();
 
   if (JvmtiExport::can_post_interpreter_events()) {
     Label run_compiled_code;
--- a/src/cpu/x86/vm/interp_masm_x86_32.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/interp_masm_x86_32.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -161,6 +161,7 @@
 
 
   // jump to an invoked target
+  void prepare_to_jump_from_interpreted();
   void jump_from_interpreted(Register method, Register temp);
 
   // Returning from interpreted functions
--- a/src/cpu/x86/vm/interp_masm_x86_64.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/interp_masm_x86_64.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -551,13 +551,18 @@
   MacroAssembler::call_VM_leaf_base(entry_point, 3);
 }
 
-// Jump to from_interpreted entry of a call unless single stepping is possible
-// in this thread in which case we must call the i2i entry
-void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
+void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() {
   // set sender sp
   lea(r13, Address(rsp, wordSize));
   // record last_sp
   movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), r13);
+}
+
+
+// Jump to from_interpreted entry of a call unless single stepping is possible
+// in this thread in which case we must call the i2i entry
+void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
+  prepare_to_jump_from_interpreted();
 
   if (JvmtiExport::can_post_interpreter_events()) {
     Label run_compiled_code;
--- a/src/cpu/x86/vm/interp_masm_x86_64.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/interp_masm_x86_64.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2009 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
@@ -176,6 +176,7 @@
   void dispatch_via (TosState state, address* table);
 
   // jump to an invoked target
+  void prepare_to_jump_from_interpreted();
   void jump_from_interpreted(Register method, Register temp);
 
 
--- a/src/cpu/x86/vm/interpreterGenerator_x86.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/interpreterGenerator_x86.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -32,6 +32,7 @@
   address generate_normal_entry(bool synchronized);
   address generate_native_entry(bool synchronized);
   address generate_abstract_entry(void);
+  address generate_method_handle_entry(void);
   address generate_math_entry(AbstractInterpreter::MethodKind kind);
   address generate_empty_entry(void);
   address generate_accessor_entry(void);
--- a/src/cpu/x86/vm/interpreter_x86_32.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/interpreter_x86_32.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -201,11 +201,12 @@
   address entry_point = __ pc();
 
   // abstract method entry
-  // remove return address. Not really needed, since exception handling throws away expression stack
-  __ pop(rbx);
 
-  // adjust stack to what a normal return would do
-  __ mov(rsp, rsi);
+  //  pop return address, reset last_sp to NULL
+  __ empty_expression_stack();
+  __ restore_bcp();      // rsi must be correct for exception handler   (was destroyed)
+  __ restore_locals();   // make sure locals pointer is correct as well (was destroyed)
+
   // throw exception
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError));
   // the call_VM checks for exception, so we should never return here.
@@ -214,6 +215,20 @@
   return entry_point;
 }
 
+
+// Method handle invoker
+// Dispatch a method of the form java.dyn.MethodHandles::invoke(...)
+address InterpreterGenerator::generate_method_handle_entry(void) {
+  if (!EnableMethodHandles) {
+    return generate_abstract_entry();
+  }
+
+  address entry_point = MethodHandles::generate_method_handle_interpreter_entry(_masm);
+
+  return entry_point;
+}
+
+
 // This method tells the deoptimizer how big an interpreted frame must be:
 int AbstractInterpreter::size_activation(methodOop method,
                                          int tempcount,
--- a/src/cpu/x86/vm/interpreter_x86_64.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/interpreter_x86_64.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2009 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
@@ -294,6 +294,16 @@
 }
 
 
+// Method handle invoker
+// Dispatch a method of the form java.dyn.MethodHandles::invoke(...)
+address InterpreterGenerator::generate_method_handle_entry(void) {
+  if (!EnableMethodHandles) {
+    return generate_abstract_entry();
+  }
+  return generate_abstract_entry(); //6815692//
+}
+
+
 // Empty method, generate a very fast return.
 
 address InterpreterGenerator::generate_empty_entry(void) {
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cpu/x86/vm/methodHandles_x86.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -0,0 +1,1133 @@
+/*
+ * Copyright 1997-2009 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.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_methodHandles_x86.cpp.incl"
+
+#define __ _masm->
+
+address MethodHandleEntry::start_compiled_entry(MacroAssembler* _masm,
+                                                address interpreted_entry) {
+  // Just before the actual machine code entry point, allocate space
+  // for a MethodHandleEntry::Data record, so that we can manage everything
+  // from one base pointer.
+  __ align(wordSize);
+  address target = __ pc() + sizeof(Data);
+  while (__ pc() < target) {
+    __ nop();
+    __ align(wordSize);
+  }
+
+  MethodHandleEntry* me = (MethodHandleEntry*) __ pc();
+  me->set_end_address(__ pc());         // set a temporary end_address
+  me->set_from_interpreted_entry(interpreted_entry);
+  me->set_type_checking_entry(NULL);
+
+  return (address) me;
+}
+
+MethodHandleEntry* MethodHandleEntry::finish_compiled_entry(MacroAssembler* _masm,
+                                                address start_addr) {
+  MethodHandleEntry* me = (MethodHandleEntry*) start_addr;
+  assert(me->end_address() == start_addr, "valid ME");
+
+  // Fill in the real end_address:
+  __ align(wordSize);
+  me->set_end_address(__ pc());
+
+  return me;
+}
+
+#ifdef ASSERT
+static void verify_argslot(MacroAssembler* _masm, Register rax_argslot,
+                           const char* error_message) {
+  // Verify that argslot lies within (rsp, rbp].
+  Label L_ok, L_bad;
+  __ cmpptr(rax_argslot, rbp);
+  __ jcc(Assembler::above, L_bad);
+  __ cmpptr(rsp, rax_argslot);
+  __ jcc(Assembler::below, L_ok);
+  __ bind(L_bad);
+  __ stop(error_message);
+  __ bind(L_ok);
+}
+#endif
+
+
+// Code generation
+address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm) {
+  // rbx: methodOop
+  // rcx: receiver method handle (must load from sp[MethodTypeForm.vmslots])
+  // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
+  // rdx: garbage temp, blown away
+
+  Register rbx_method = rbx;
+  Register rcx_recv   = rcx;
+  Register rax_mtype  = rax;
+  Register rdx_temp   = rdx;
+
+  // emit WrongMethodType path first, to enable jccb back-branch from main path
+  Label wrong_method_type;
+  __ bind(wrong_method_type);
+  __ push(rax_mtype);       // required mtype
+  __ push(rcx_recv);        // bad mh (1st stacked argument)
+  __ jump(ExternalAddress(Interpreter::throw_WrongMethodType_entry()));
+
+  // here's where control starts out:
+  __ align(CodeEntryAlignment);
+  address entry_point = __ pc();
+
+  // fetch the MethodType from the method handle into rax (the 'check' register)
+  {
+    Register tem = rbx_method;
+    for (jint* pchase = methodOopDesc::method_type_offsets_chain(); (*pchase) != -1; pchase++) {
+      __ movptr(rax_mtype, Address(tem, *pchase));
+      tem = rax_mtype;          // in case there is another indirection
+    }
+  }
+  Register rbx_temp = rbx_method; // done with incoming methodOop
+
+  // given the MethodType, find out where the MH argument is buried
+  __ movptr(rdx_temp, Address(rax_mtype,
+                              __ delayed_value(java_dyn_MethodType::form_offset_in_bytes, rbx_temp)));
+  __ movl(rdx_temp, Address(rdx_temp,
+                            __ delayed_value(java_dyn_MethodTypeForm::vmslots_offset_in_bytes, rbx_temp)));
+  __ movptr(rcx_recv, __ argument_address(rdx_temp));
+
+  __ check_method_handle_type(rax_mtype, rcx_recv, rdx_temp, wrong_method_type);
+  __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+
+  return entry_point;
+}
+
+// Helper to insert argument slots into the stack.
+// arg_slots must be a multiple of stack_move_unit() and <= 0
+void MethodHandles::insert_arg_slots(MacroAssembler* _masm,
+                                     RegisterOrConstant arg_slots,
+                                     int arg_mask,
+                                     Register rax_argslot,
+                                     Register rbx_temp, Register rdx_temp) {
+  assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
+                             (!arg_slots.is_register() ? rsp : arg_slots.as_register()));
+
+#ifdef ASSERT
+  verify_argslot(_masm, rax_argslot, "insertion point must fall within current frame");
+  if (arg_slots.is_register()) {
+    Label L_ok, L_bad;
+    __ cmpptr(arg_slots.as_register(), (int32_t) NULL_WORD);
+    __ jcc(Assembler::greater, L_bad);
+    __ testl(arg_slots.as_register(), -stack_move_unit() - 1);
+    __ jcc(Assembler::zero, L_ok);
+    __ bind(L_bad);
+    __ stop("assert arg_slots <= 0 and clear low bits");
+    __ bind(L_ok);
+  } else {
+    assert(arg_slots.as_constant() <= 0, "");
+    assert(arg_slots.as_constant() % -stack_move_unit() == 0, "");
+  }
+#endif //ASSERT
+
+#ifdef _LP64
+  if (arg_slots.is_register()) {
+    // clean high bits of stack motion register (was loaded as an int)
+    __ movslq(arg_slots.as_register(), arg_slots.as_register());
+  }
+#endif
+
+  // Make space on the stack for the inserted argument(s).
+  // Then pull down everything shallower than rax_argslot.
+  // The stacked return address gets pulled down with everything else.
+  // That is, copy [rsp, argslot) downward by -size words.  In pseudo-code:
+  //   rsp -= size;
+  //   for (rdx = rsp + size; rdx < argslot; rdx++)
+  //     rdx[-size] = rdx[0]
+  //   argslot -= size;
+  __ mov(rdx_temp, rsp);                        // source pointer for copy
+  __ lea(rsp, Address(rsp, arg_slots, Address::times_ptr));
+  {
+    Label loop;
+    __ bind(loop);
+    // pull one word down each time through the loop
+    __ movptr(rbx_temp, Address(rdx_temp, 0));
+    __ movptr(Address(rdx_temp, arg_slots, Address::times_ptr), rbx_temp);
+    __ addptr(rdx_temp, wordSize);
+    __ cmpptr(rdx_temp, rax_argslot);
+    __ jcc(Assembler::less, loop);
+  }
+
+  // Now move the argslot down, to point to the opened-up space.
+  __ lea(rax_argslot, Address(rax_argslot, arg_slots, Address::times_ptr));
+
+  if (TaggedStackInterpreter && arg_mask != _INSERT_NO_MASK) {
+    // The caller has specified a bitmask of tags to put into the opened space.
+    // This only works when the arg_slots value is an assembly-time constant.
+    int constant_arg_slots = arg_slots.as_constant() / stack_move_unit();
+    int tag_offset = Interpreter::tag_offset_in_bytes() - Interpreter::value_offset_in_bytes();
+    for (int slot = 0; slot < constant_arg_slots; slot++) {
+      BasicType slot_type   = ((arg_mask & (1 << slot)) == 0 ? T_OBJECT : T_INT);
+      int       slot_offset = Interpreter::stackElementSize() * slot;
+      Address   tag_addr(rax_argslot, slot_offset + tag_offset);
+      __ movptr(tag_addr, frame::tag_for_basic_type(slot_type));
+    }
+    // Note that the new argument slots are tagged properly but contain
+    // garbage at this point.  The value portions must be initialized
+    // by the caller.  (Especially references!)
+  }
+}
+
+// Helper to remove argument slots from the stack.
+// arg_slots must be a multiple of stack_move_unit() and >= 0
+void MethodHandles::remove_arg_slots(MacroAssembler* _masm,
+                                    RegisterOrConstant arg_slots,
+                                    Register rax_argslot,
+                                    Register rbx_temp, Register rdx_temp) {
+  assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
+                             (!arg_slots.is_register() ? rsp : arg_slots.as_register()));
+
+#ifdef ASSERT
+  {
+    // Verify that [argslot..argslot+size) lies within (rsp, rbp).
+    Label L_ok, L_bad;
+    __ lea(rbx_temp, Address(rax_argslot, arg_slots, Address::times_ptr));
+    __ cmpptr(rbx_temp, rbp);
+    __ jcc(Assembler::above, L_bad);
+    __ cmpptr(rsp, rax_argslot);
+    __ jcc(Assembler::below, L_ok);
+    __ bind(L_bad);
+    __ stop("deleted argument(s) must fall within current frame");
+    __ bind(L_ok);
+  }
+  if (arg_slots.is_register()) {
+    Label L_ok, L_bad;
+    __ cmpptr(arg_slots.as_register(), (int32_t) NULL_WORD);
+    __ jcc(Assembler::less, L_bad);
+    __ testl(arg_slots.as_register(), -stack_move_unit() - 1);
+    __ jcc(Assembler::zero, L_ok);
+    __ bind(L_bad);
+    __ stop("assert arg_slots >= 0 and clear low bits");
+    __ bind(L_ok);
+  } else {
+    assert(arg_slots.as_constant() >= 0, "");
+    assert(arg_slots.as_constant() % -stack_move_unit() == 0, "");
+  }
+#endif //ASSERT
+
+#ifdef _LP64
+  if (false) {                  // not needed, since register is positive
+    // clean high bits of stack motion register (was loaded as an int)
+    if (arg_slots.is_register())
+      __ movslq(arg_slots.as_register(), arg_slots.as_register());
+  }
+#endif
+
+  // Pull up everything shallower than rax_argslot.
+  // Then remove the excess space on the stack.
+  // The stacked return address gets pulled up with everything else.
+  // That is, copy [rsp, argslot) upward by size words.  In pseudo-code:
+  //   for (rdx = argslot-1; rdx >= rsp; --rdx)
+  //     rdx[size] = rdx[0]
+  //   argslot += size;
+  //   rsp += size;
+  __ lea(rdx_temp, Address(rax_argslot, -wordSize)); // source pointer for copy
+  {
+    Label loop;
+    __ bind(loop);
+    // pull one word up each time through the loop
+    __ movptr(rbx_temp, Address(rdx_temp, 0));
+    __ movptr(Address(rdx_temp, arg_slots, Address::times_ptr), rbx_temp);
+    __ addptr(rdx_temp, -wordSize);
+    __ cmpptr(rdx_temp, rsp);
+    __ jcc(Assembler::greaterEqual, loop);
+  }
+
+  // Now move the argslot up, to point to the just-copied block.
+  __ lea(rsp, Address(rsp, arg_slots, Address::times_ptr));
+  // And adjust the argslot address to point at the deletion point.
+  __ lea(rax_argslot, Address(rax_argslot, arg_slots, Address::times_ptr));
+}
+
+#ifndef PRODUCT
+void trace_method_handle_stub(const char* adaptername,
+                              oop mh,
+                              intptr_t* entry_sp,
+                              intptr_t* saved_sp) {
+  // called as a leaf from native code: do not block the JVM!
+  printf("MH %s "PTR_FORMAT" "PTR_FORMAT" "INTX_FORMAT"\n", adaptername, mh, entry_sp, entry_sp - saved_sp);
+}
+#endif //PRODUCT
+
+// Generate an "entry" field for a method handle.
+// This determines how the method handle will respond to calls.
+void MethodHandles::generate_method_handle_stub(MacroAssembler* _masm, MethodHandles::EntryKind ek) {
+  // Here is the register state during an interpreted call,
+  // as set up by generate_method_handle_interpreter_entry():
+  // - rbx: garbage temp (was MethodHandle.invoke methodOop, unused)
+  // - rcx: receiver method handle
+  // - rax: method handle type (only used by the check_mtype entry point)
+  // - rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
+  // - rdx: garbage temp, can blow away
+
+  Register rcx_recv    = rcx;
+  Register rax_argslot = rax;
+  Register rbx_temp    = rbx;
+  Register rdx_temp    = rdx;
+
+  guarantee(java_dyn_MethodHandle::vmentry_offset_in_bytes() != 0, "must have offsets");
+
+  // some handy addresses
+  Address rbx_method_fie(     rbx,      methodOopDesc::from_interpreted_offset() );
+
+  Address rcx_mh_vmtarget(    rcx_recv, java_dyn_MethodHandle::vmtarget_offset_in_bytes() );
+  Address rcx_dmh_vmindex(    rcx_recv, sun_dyn_DirectMethodHandle::vmindex_offset_in_bytes() );
+
+  Address rcx_bmh_vmargslot(  rcx_recv, sun_dyn_BoundMethodHandle::vmargslot_offset_in_bytes() );
+  Address rcx_bmh_argument(   rcx_recv, sun_dyn_BoundMethodHandle::argument_offset_in_bytes() );
+
+  Address rcx_amh_vmargslot(  rcx_recv, sun_dyn_AdapterMethodHandle::vmargslot_offset_in_bytes() );
+  Address rcx_amh_argument(   rcx_recv, sun_dyn_AdapterMethodHandle::argument_offset_in_bytes() );
+  Address rcx_amh_conversion( rcx_recv, sun_dyn_AdapterMethodHandle::conversion_offset_in_bytes() );
+  Address vmarg;                // __ argument_address(vmargslot)
+
+  int tag_offset = -1;
+  if (TaggedStackInterpreter) {
+    tag_offset = Interpreter::tag_offset_in_bytes() - Interpreter::value_offset_in_bytes();
+    assert(tag_offset = wordSize, "stack grows as expected");
+  }
+
+  if (have_entry(ek)) {
+    __ nop();                   // empty stubs make SG sick
+    return;
+  }
+
+  address interp_entry = __ pc();
+  if (UseCompressedOops)  __ unimplemented("UseCompressedOops");
+
+#ifndef PRODUCT
+  if (TraceMethodHandles) {
+    __ push(rax); __ push(rbx); __ push(rcx); __ push(rdx); __ push(rsi); __ push(rdi);
+    __ lea(rax, Address(rsp, wordSize*6)); // entry_sp
+    // arguments:
+    __ push(rsi);               // saved_sp
+    __ push(rax);               // entry_sp
+    __ push(rcx);               // mh
+    __ push(rcx);
+    __ movptr(Address(rsp, 0), (intptr_t)entry_name(ek));
+    __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub), 4);
+    __ pop(rdi); __ pop(rsi); __ pop(rdx); __ pop(rcx); __ pop(rbx); __ pop(rax);
+  }
+#endif //PRODUCT
+
+  switch ((int) ek) {
+  case _check_mtype:
+    {
+      // this stub is special, because it requires a live mtype argument
+      Register rax_mtype = rax;
+
+      // emit WrongMethodType path first, to enable jccb back-branch
+      Label wrong_method_type;
+      __ bind(wrong_method_type);
+      __ movptr(rdx_temp, ExternalAddress((address) &_entries[_wrong_method_type]));
+      __ jmp(Address(rdx_temp, MethodHandleEntry::from_interpreted_entry_offset_in_bytes()));
+      __ hlt();
+
+      interp_entry = __ pc();
+      __ check_method_handle_type(rax_mtype, rcx_recv, rdx_temp, wrong_method_type);
+      // now rax_mtype is dead; subsequent stubs will use it as a temp
+
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    }
+    break;
+
+  case _wrong_method_type:
+    {
+      // this stub is special, because it requires a live mtype argument
+      Register rax_mtype = rax;
+
+      interp_entry = __ pc();
+      __ push(rax_mtype);       // required mtype
+      __ push(rcx_recv);        // random mh (1st stacked argument)
+      __ jump(ExternalAddress(Interpreter::throw_WrongMethodType_entry()));
+    }
+    break;
+
+  case _invokestatic_mh:
+  case _invokespecial_mh:
+    {
+      Register rbx_method = rbx_temp;
+      __ movptr(rbx_method, rcx_mh_vmtarget); // target is a methodOop
+      __ verify_oop(rbx_method);
+      // same as TemplateTable::invokestatic or invokespecial,
+      // minus the CP setup and profiling:
+      if (ek == _invokespecial_mh) {
+        // Must load & check the first argument before entering the target method.
+        __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
+        __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
+        __ null_check(rcx_recv);
+        __ verify_oop(rcx_recv);
+      }
+      __ jmp(rbx_method_fie);
+    }
+    break;
+
+  case _invokevirtual_mh:
+    {
+      // same as TemplateTable::invokevirtual,
+      // minus the CP setup and profiling:
+
+      // pick out the vtable index and receiver offset from the MH,
+      // and then we can discard it:
+      __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
+      Register rbx_index = rbx_temp;
+      __ movl(rbx_index, rcx_dmh_vmindex);
+      // Note:  The verifier allows us to ignore rcx_mh_vmtarget.
+      __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
+      __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());
+
+      // get receiver klass
+      Register rax_klass = rax_argslot;
+      __ load_klass(rax_klass, rcx_recv);
+      __ verify_oop(rax_klass);
+
+      // get target methodOop & entry point
+      const int base = instanceKlass::vtable_start_offset() * wordSize;
+      assert(vtableEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");
+      Address vtable_entry_addr(rax_klass,
+                                rbx_index, Address::times_ptr,
+                                base + vtableEntry::method_offset_in_bytes());
+      Register rbx_method = rbx_temp;
+      __ movl(rbx_method, vtable_entry_addr);
+
+      __ verify_oop(rbx_method);
+      __ jmp(rbx_method_fie);
+    }
+    break;
+
+  case _invokeinterface_mh:
+    {
+      // same as TemplateTable::invokeinterface,
+      // minus the CP setup and profiling:
+
+      // pick out the interface and itable index from the MH.
+      __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
+      Register rdx_intf  = rdx_temp;
+      Register rbx_index = rbx_temp;
+      __ movptr(rdx_intf,  rcx_mh_vmtarget);
+      __ movl(rbx_index,   rcx_dmh_vmindex);
+      __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
+      __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());
+
+      // get receiver klass
+      Register rax_klass = rax_argslot;
+      __ load_klass(rax_klass, rcx_recv);
+      __ verify_oop(rax_klass);
+
+      Register rcx_temp   = rcx_recv;
+      Register rbx_method = rbx_index;
+
+      // get interface klass
+      Label no_such_interface;
+      __ verify_oop(rdx_intf);
+      __ lookup_interface_method(rax_klass, rdx_intf,
+                                 // note: next two args must be the same:
+                                 rbx_index, rbx_method,
+                                 rcx_temp,
+                                 no_such_interface);
+
+      __ verify_oop(rbx_method);
+      __ jmp(rbx_method_fie);
+      __ hlt();
+
+      __ bind(no_such_interface);
+      // Throw an exception.
+      // For historical reasons, it will be IncompatibleClassChangeError.
+      __ should_not_reach_here(); // %%% FIXME NYI
+    }
+    break;
+
+  case _bound_ref_mh:
+  case _bound_int_mh:
+  case _bound_long_mh:
+  case _bound_ref_direct_mh:
+  case _bound_int_direct_mh:
+  case _bound_long_direct_mh:
+    {
+      bool direct_to_method = (ek >= _bound_ref_direct_mh);
+      BasicType arg_type = T_ILLEGAL;
+      if (ek == _bound_long_mh || ek == _bound_long_direct_mh) {
+        arg_type = T_LONG;
+      } else if (ek == _bound_int_mh || ek == _bound_int_direct_mh) {
+        arg_type = T_INT;
+      } else {
+        assert(ek == _bound_ref_mh || ek == _bound_ref_direct_mh, "must be ref");
+        arg_type = T_OBJECT;
+      }
+      int arg_slots = type2size[arg_type];
+      int arg_mask  = (arg_type == T_OBJECT ? _INSERT_REF_MASK :
+                       arg_slots == 1       ? _INSERT_INT_MASK :  _INSERT_LONG_MASK);
+
+      // make room for the new argument:
+      __ movl(rax_argslot, rcx_bmh_vmargslot);
+      __ lea(rax_argslot, __ argument_address(rax_argslot));
+      insert_arg_slots(_masm, arg_slots * stack_move_unit(), arg_mask,
+                       rax_argslot, rbx_temp, rdx_temp);
+
+      // store bound argument into the new stack slot:
+      __ movptr(rbx_temp, rcx_bmh_argument);
+      Address prim_value_addr(rbx_temp, java_lang_boxing_object::value_offset_in_bytes(arg_type));
+      if (arg_type == T_OBJECT) {
+        __ movptr(Address(rax_argslot, 0), rbx_temp);
+      } else {
+        __ load_sized_value(rbx_temp, prim_value_addr,
+                            type2aelembytes(arg_type), is_signed_subword_type(arg_type));
+        __ movptr(Address(rax_argslot, 0), rbx_temp);
+#ifndef _LP64
+        if (arg_slots == 2) {
+          __ movl(rbx_temp, prim_value_addr.plus_disp(wordSize));
+          __ movl(Address(rax_argslot, Interpreter::stackElementSize()), rbx_temp);
+        }
+#endif //_LP64
+        break;
+      }
+
+      if (direct_to_method) {
+        Register rbx_method = rbx_temp;
+        __ movptr(rbx_method, rcx_mh_vmtarget);
+        __ verify_oop(rbx_method);
+        __ jmp(rbx_method_fie);
+      } else {
+        __ movptr(rcx_recv, rcx_mh_vmtarget);
+        __ verify_oop(rcx_recv);
+        __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+      }
+    }
+    break;
+
+  case _adapter_retype_only:
+    // immediately jump to the next MH layer:
+    __ movptr(rcx_recv, rcx_mh_vmtarget);
+    __ verify_oop(rcx_recv);
+    __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    // This is OK when all parameter types widen.
+    // It is also OK when a return type narrows.
+    break;
+
+  case _adapter_check_cast:
+    {
+      // temps:
+      Register rbx_klass = rbx_temp; // interesting AMH data
+
+      // check a reference argument before jumping to the next layer of MH:
+      __ movl(rax_argslot, rcx_amh_vmargslot);
+      vmarg = __ argument_address(rax_argslot);
+
+      // What class are we casting to?
+      __ movptr(rbx_klass, rcx_amh_argument); // this is a Class object!
+      __ movptr(rbx_klass, Address(rbx_klass, java_lang_Class::klass_offset_in_bytes()));
+
+      // get the new MH:
+      __ movptr(rcx_recv, rcx_mh_vmtarget);
+      // (now we are done with the old MH)
+
+      Label done;
+      __ movptr(rdx_temp, vmarg);
+      __ testl(rdx_temp, rdx_temp);
+      __ jcc(Assembler::zero, done);          // no cast if null
+      __ load_klass(rdx_temp, rdx_temp);
+
+      // live at this point:
+      // - rbx_klass:  klass required by the target method
+      // - rdx_temp:   argument klass to test
+      // - rcx_recv:   method handle to invoke (after cast succeeds)
+      __ check_klass_subtype(rdx_temp, rbx_klass, rax_argslot, done);
+
+      // If we get here, the type check failed!
+      // Call the wrong_method_type stub, passing the failing argument type in rax.
+      Register rax_mtype = rax_argslot;
+      __ push(rbx_klass);       // missed klass (required type)
+      __ push(rdx_temp);        // bad actual type (1st stacked argument)
+      __ jump(ExternalAddress(Interpreter::throw_WrongMethodType_entry()));
+
+      __ bind(done);
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    }
+    break;
+
+  case _adapter_prim_to_prim:
+  case _adapter_ref_to_prim:
+    // handled completely by optimized cases
+    __ stop("init_AdapterMethodHandle should not issue this");
+    break;
+
+  case _adapter_opt_i2i:        // optimized subcase of adapt_prim_to_prim
+//case _adapter_opt_f2i:        // optimized subcase of adapt_prim_to_prim
+  case _adapter_opt_l2i:        // optimized subcase of adapt_prim_to_prim
+  case _adapter_opt_unboxi:     // optimized subcase of adapt_ref_to_prim
+    {
+      // perform an in-place conversion to int or an int subword
+      __ movl(rax_argslot, rcx_amh_vmargslot);
+      vmarg = __ argument_address(rax_argslot);
+
+      switch (ek) {
+      case _adapter_opt_i2i:
+        __ movl(rdx_temp, vmarg);
+        break;
+      case _adapter_opt_l2i:
+        {
+          // just delete the extra slot; on a little-endian machine we keep the first
+          __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
+          remove_arg_slots(_masm, -stack_move_unit(),
+                           rax_argslot, rbx_temp, rdx_temp);
+          vmarg = Address(rax_argslot, -Interpreter::stackElementSize());
+          __ movl(rdx_temp, vmarg);
+        }
+        break;
+      case _adapter_opt_unboxi:
+        {
+          // Load the value up from the heap.
+          __ movptr(rdx_temp, vmarg);
+          int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
+#ifdef ASSERT
+          for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
+            if (is_subword_type(BasicType(bt)))
+              assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(BasicType(bt)), "");
+          }
+#endif
+          __ null_check(rdx_temp, value_offset);
+          __ movl(rdx_temp, Address(rdx_temp, value_offset));
+          // We load this as a word.  Because we are little-endian,
+          // the low bits will be correct, but the high bits may need cleaning.
+          // The vminfo will guide us to clean those bits.
+        }
+        break;
+      default:
+        assert(false, "");
+      }
+      goto finish_int_conversion;
+    }
+
+  finish_int_conversion:
+    {
+      Register rbx_vminfo = rbx_temp;
+      __ movl(rbx_vminfo, rcx_amh_conversion);
+      assert(CONV_VMINFO_SHIFT == 0, "preshifted");
+
+      // get the new MH:
+      __ movptr(rcx_recv, rcx_mh_vmtarget);
+      // (now we are done with the old MH)
+
+      // original 32-bit vmdata word must be of this form:
+      //    | MBZ:16 | signBitCount:8 | srcDstTypes:8 | conversionOp:8 |
+      __ xchgl(rcx, rbx_vminfo);                // free rcx for shifts
+      __ shll(rdx_temp /*, rcx*/);
+      Label zero_extend, done;
+      __ testl(rcx, CONV_VMINFO_SIGN_FLAG);
+      __ jcc(Assembler::zero, zero_extend);
+
+      // this path is taken for int->byte, int->short
+      __ sarl(rdx_temp /*, rcx*/);
+      __ jmp(done);
+
+      __ bind(zero_extend);
+      // this is taken for int->char
+      __ shrl(rdx_temp /*, rcx*/);
+
+      __ bind(done);
+      __ movptr(vmarg, rdx_temp);
+      __ xchgl(rcx, rbx_vminfo);                // restore rcx_recv
+
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    }
+    break;
+
+  case _adapter_opt_i2l:        // optimized subcase of adapt_prim_to_prim
+  case _adapter_opt_unboxl:     // optimized subcase of adapt_ref_to_prim
+    {
+      // perform an in-place int-to-long or ref-to-long conversion
+      __ movl(rax_argslot, rcx_amh_vmargslot);
+
+      // on a little-endian machine we keep the first slot and add another after
+      __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
+      insert_arg_slots(_masm, stack_move_unit(), _INSERT_INT_MASK,
+                       rax_argslot, rbx_temp, rdx_temp);
+      Address vmarg1(rax_argslot, -Interpreter::stackElementSize());
+      Address vmarg2 = vmarg1.plus_disp(Interpreter::stackElementSize());
+
+      switch (ek) {
+      case _adapter_opt_i2l:
+        {
+          __ movl(rdx_temp, vmarg1);
+          __ sarl(rdx_temp, 31);  // __ extend_sign()
+          __ movl(vmarg2, rdx_temp); // store second word
+        }
+        break;
+      case _adapter_opt_unboxl:
+        {
+          // Load the value up from the heap.
+          __ movptr(rdx_temp, vmarg1);
+          int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_LONG);
+          assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(T_DOUBLE), "");
+          __ null_check(rdx_temp, value_offset);
+          __ movl(rbx_temp, Address(rdx_temp, value_offset + 0*BytesPerInt));
+          __ movl(rdx_temp, Address(rdx_temp, value_offset + 1*BytesPerInt));
+          __ movl(vmarg1, rbx_temp);
+          __ movl(vmarg2, rdx_temp);
+        }
+        break;
+      default:
+        assert(false, "");
+      }
+
+      __ movptr(rcx_recv, rcx_mh_vmtarget);
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    }
+    break;
+
+  case _adapter_opt_f2d:        // optimized subcase of adapt_prim_to_prim
+  case _adapter_opt_d2f:        // optimized subcase of adapt_prim_to_prim
+    {
+      // perform an in-place floating primitive conversion
+      __ movl(rax_argslot, rcx_amh_vmargslot);
+      __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
+      if (ek == _adapter_opt_f2d) {
+        insert_arg_slots(_masm, stack_move_unit(), _INSERT_INT_MASK,
+                         rax_argslot, rbx_temp, rdx_temp);
+      }
+      Address vmarg(rax_argslot, -Interpreter::stackElementSize());
+
+#ifdef _LP64
+      if (ek == _adapter_opt_f2d) {
+        __ movflt(xmm0, vmarg);
+        __ cvtss2sd(xmm0, xmm0);
+        __ movdbl(vmarg, xmm0);
+      } else {
+        __ movdbl(xmm0, vmarg);
+        __ cvtsd2ss(xmm0, xmm0);
+        __ movflt(vmarg, xmm0);
+      }
+#else //_LP64
+      if (ek == _adapter_opt_f2d) {
+        __ fld_s(vmarg);        // load float to ST0
+        __ fstp_s(vmarg);       // store single
+      } else if (!TaggedStackInterpreter) {
+        __ fld_d(vmarg);        // load double to ST0
+        __ fstp_s(vmarg);       // store single
+      } else {
+        Address vmarg_tag = vmarg.plus_disp(tag_offset);
+        Address vmarg2    = vmarg.plus_disp(Interpreter::stackElementSize());
+        // vmarg2_tag does not participate in this code
+        Register rbx_tag = rbx_temp;
+        __ movl(rbx_tag, vmarg_tag); // preserve tag
+        __ movl(rdx_temp, vmarg2); // get second word of double
+        __ movl(vmarg_tag, rdx_temp); // align with first word
+        __ fld_d(vmarg);        // load double to ST0
+        __ movl(vmarg_tag, rbx_tag); // restore tag
+        __ fstp_s(vmarg);       // store single
+      }
+#endif //_LP64
+
+      if (ek == _adapter_opt_d2f) {
+        remove_arg_slots(_masm, -stack_move_unit(),
+                         rax_argslot, rbx_temp, rdx_temp);
+      }
+
+      __ movptr(rcx_recv, rcx_mh_vmtarget);
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    }
+    break;
+
+  case _adapter_prim_to_ref:
+    __ unimplemented(entry_name(ek)); // %%% FIXME: NYI
+    break;
+
+  case _adapter_swap_args:
+  case _adapter_rot_args:
+    // handled completely by optimized cases
+    __ stop("init_AdapterMethodHandle should not issue this");
+    break;
+
+  case _adapter_opt_swap_1:
+  case _adapter_opt_swap_2:
+  case _adapter_opt_rot_1_up:
+  case _adapter_opt_rot_1_down:
+  case _adapter_opt_rot_2_up:
+  case _adapter_opt_rot_2_down:
+    {
+      int rotate = 0, swap_slots = 0;
+      switch ((int)ek) {
+      case _adapter_opt_swap_1:     swap_slots = 1; break;
+      case _adapter_opt_swap_2:     swap_slots = 2; break;
+      case _adapter_opt_rot_1_up:   swap_slots = 1; rotate++; break;
+      case _adapter_opt_rot_1_down: swap_slots = 1; rotate--; break;
+      case _adapter_opt_rot_2_up:   swap_slots = 2; rotate++; break;
+      case _adapter_opt_rot_2_down: swap_slots = 2; rotate--; break;
+      default: assert(false, "");
+      }
+
+      // the real size of the move must be doubled if TaggedStackInterpreter:
+      int swap_bytes = (int)( swap_slots * Interpreter::stackElementWords() * wordSize );
+
+      // 'argslot' is the position of the first argument to swap
+      __ movl(rax_argslot, rcx_amh_vmargslot);
+      __ lea(rax_argslot, __ argument_address(rax_argslot));
+
+      // 'vminfo' is the second
+      Register rbx_destslot = rbx_temp;
+      __ movl(rbx_destslot, rcx_amh_conversion);
+      assert(CONV_VMINFO_SHIFT == 0, "preshifted");
+      __ andl(rbx_destslot, CONV_VMINFO_MASK);
+      __ lea(rbx_destslot, __ argument_address(rbx_destslot));
+      DEBUG_ONLY(verify_argslot(_masm, rbx_destslot, "swap point must fall within current frame"));
+
+      if (!rotate) {
+        for (int i = 0; i < swap_bytes; i += wordSize) {
+          __ movptr(rdx_temp, Address(rax_argslot , i));
+          __ push(rdx_temp);
+          __ movptr(rdx_temp, Address(rbx_destslot, i));
+          __ movptr(Address(rax_argslot, i), rdx_temp);
+          __ pop(rdx_temp);
+          __ movptr(Address(rbx_destslot, i), rdx_temp);
+        }
+      } else {
+        // push the first chunk, which is going to get overwritten
+        for (int i = swap_bytes; (i -= wordSize) >= 0; ) {
+          __ movptr(rdx_temp, Address(rax_argslot, i));
+          __ push(rdx_temp);
+        }
+
+        if (rotate > 0) {
+          // rotate upward
+          __ subptr(rax_argslot, swap_bytes);
+#ifdef ASSERT
+          {
+            // Verify that argslot > destslot, by at least swap_bytes.
+            Label L_ok;
+            __ cmpptr(rax_argslot, rbx_destslot);
+            __ jcc(Assembler::aboveEqual, L_ok);
+            __ stop("source must be above destination (upward rotation)");
+            __ bind(L_ok);
+          }
+#endif
+          // work argslot down to destslot, copying contiguous data upwards
+          // pseudo-code:
+          //   rax = src_addr - swap_bytes
+          //   rbx = dest_addr
+          //   while (rax >= rbx) *(rax + swap_bytes) = *(rax + 0), rax--;
+          Label loop;
+          __ bind(loop);
+          __ movptr(rdx_temp, Address(rax_argslot, 0));
+          __ movptr(Address(rax_argslot, swap_bytes), rdx_temp);
+          __ addptr(rax_argslot, -wordSize);
+          __ cmpptr(rax_argslot, rbx_destslot);
+          __ jcc(Assembler::aboveEqual, loop);
+        } else {
+          __ addptr(rax_argslot, swap_bytes);
+#ifdef ASSERT
+          {
+            // Verify that argslot < destslot, by at least swap_bytes.
+            Label L_ok;
+            __ cmpptr(rax_argslot, rbx_destslot);
+            __ jcc(Assembler::belowEqual, L_ok);
+            __ stop("source must be below destination (downward rotation)");
+            __ bind(L_ok);
+          }
+#endif
+          // work argslot up to destslot, copying contiguous data downwards
+          // pseudo-code:
+          //   rax = src_addr + swap_bytes
+          //   rbx = dest_addr
+          //   while (rax <= rbx) *(rax - swap_bytes) = *(rax + 0), rax++;
+          Label loop;
+          __ bind(loop);
+          __ movptr(rdx_temp, Address(rax_argslot, 0));
+          __ movptr(Address(rax_argslot, -swap_bytes), rdx_temp);
+          __ addptr(rax_argslot, wordSize);
+          __ cmpptr(rax_argslot, rbx_destslot);
+          __ jcc(Assembler::belowEqual, loop);
+        }
+
+        // pop the original first chunk into the destination slot, now free
+        for (int i = 0; i < swap_bytes; i += wordSize) {
+          __ pop(rdx_temp);
+          __ movptr(Address(rbx_destslot, i), rdx_temp);
+        }
+      }
+
+      __ movptr(rcx_recv, rcx_mh_vmtarget);
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    }
+    break;
+
+  case _adapter_dup_args:
+    {
+      // 'argslot' is the position of the first argument to duplicate
+      __ movl(rax_argslot, rcx_amh_vmargslot);
+      __ lea(rax_argslot, __ argument_address(rax_argslot));
+
+      // 'stack_move' is negative number of words to duplicate
+      Register rdx_stack_move = rdx_temp;
+      __ movl(rdx_stack_move, rcx_amh_conversion);
+      __ sarl(rdx_stack_move, CONV_STACK_MOVE_SHIFT);
+
+      int argslot0_num = 0;
+      Address argslot0 = __ argument_address(RegisterOrConstant(argslot0_num));
+      assert(argslot0.base() == rsp, "");
+      int pre_arg_size = argslot0.disp();
+      assert(pre_arg_size % wordSize == 0, "");
+      assert(pre_arg_size > 0, "must include PC");
+
+      // remember the old rsp+1 (argslot[0])
+      Register rbx_oldarg = rbx_temp;
+      __ lea(rbx_oldarg, argslot0);
+
+      // move rsp down to make room for dups
+      __ lea(rsp, Address(rsp, rdx_stack_move, Address::times_ptr));
+
+      // compute the new rsp+1 (argslot[0])
+      Register rdx_newarg = rdx_temp;
+      __ lea(rdx_newarg, argslot0);
+
+      __ push(rdi);             // need a temp
+      // (preceding push must be done after arg addresses are taken!)
+
+      // pull down the pre_arg_size data (PC)
+      for (int i = -pre_arg_size; i < 0; i += wordSize) {
+        __ movptr(rdi, Address(rbx_oldarg, i));
+        __ movptr(Address(rdx_newarg, i), rdi);
+      }
+
+      // copy from rax_argslot[0...] down to new_rsp[1...]
+      // pseudo-code:
+      //   rbx = old_rsp+1
+      //   rdx = new_rsp+1
+      //   rax = argslot
+      //   while (rdx < rbx) *rdx++ = *rax++
+      Label loop;
+      __ bind(loop);
+      __ movptr(rdi, Address(rax_argslot, 0));
+      __ movptr(Address(rdx_newarg, 0), rdi);
+      __ addptr(rax_argslot, wordSize);
+      __ addptr(rdx_newarg, wordSize);
+      __ cmpptr(rdx_newarg, rbx_oldarg);
+      __ jcc(Assembler::less, loop);
+
+      __ pop(rdi);              // restore temp
+
+      __ movptr(rcx_recv, rcx_mh_vmtarget);
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    }
+    break;
+
+  case _adapter_drop_args:
+    {
+      // 'argslot' is the position of the first argument to nuke
+      __ movl(rax_argslot, rcx_amh_vmargslot);
+      __ lea(rax_argslot, __ argument_address(rax_argslot));
+
+      __ push(rdi);             // need a temp
+      // (must do previous push after argslot address is taken)
+
+      // 'stack_move' is number of words to drop
+      Register rdi_stack_move = rdi;
+      __ movl(rdi_stack_move, rcx_amh_conversion);
+      __ sarl(rdi_stack_move, CONV_STACK_MOVE_SHIFT);
+      remove_arg_slots(_masm, rdi_stack_move,
+                       rax_argslot, rbx_temp, rdx_temp);
+
+      __ pop(rdi);              // restore temp
+
+      __ movptr(rcx_recv, rcx_mh_vmtarget);
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+    }
+    break;
+
+  case _adapter_collect_args:
+    __ unimplemented(entry_name(ek)); // %%% FIXME: NYI
+    break;
+
+  case _adapter_spread_args:
+    // handled completely by optimized cases
+    __ stop("init_AdapterMethodHandle should not issue this");
+    break;
+
+  case _adapter_opt_spread_0:
+  case _adapter_opt_spread_1:
+  case _adapter_opt_spread_more:
+    {
+      // spread an array out into a group of arguments
+      int length_constant = -1;
+      switch (ek) {
+      case _adapter_opt_spread_0: length_constant = 0; break;
+      case _adapter_opt_spread_1: length_constant = 1; break;
+      }
+
+      // find the address of the array argument
+      __ movl(rax_argslot, rcx_amh_vmargslot);
+      __ lea(rax_argslot, __ argument_address(rax_argslot));
+
+      // grab some temps
+      { __ push(rsi); __ push(rdi); }
+      // (preceding pushes must be done after argslot address is taken!)
+#define UNPUSH_RSI_RDI \
+      { __ pop(rdi); __ pop(rsi); }
+
+      // arx_argslot points both to the array and to the first output arg
+      vmarg = Address(rax_argslot, 0);
+
+      // Get the array value.
+      Register  rsi_array       = rsi;
+      Register  rdx_array_klass = rdx_temp;
+      BasicType elem_type       = T_OBJECT;
+      int       length_offset   = arrayOopDesc::length_offset_in_bytes();
+      int       elem0_offset    = arrayOopDesc::base_offset_in_bytes(elem_type);
+      __ movptr(rsi_array, vmarg);
+      Label skip_array_check;
+      if (length_constant == 0) {
+        __ testptr(rsi_array, rsi_array);
+        __ jcc(Assembler::zero, skip_array_check);
+      }
+      __ null_check(rsi_array, oopDesc::klass_offset_in_bytes());
+      __ load_klass(rdx_array_klass, rsi_array);
+
+      // Check the array type.
+      Register rbx_klass = rbx_temp;
+      __ movptr(rbx_klass, rcx_amh_argument); // this is a Class object!
+      __ movptr(rbx_klass, Address(rbx_klass, java_lang_Class::klass_offset_in_bytes()));
+
+      Label ok_array_klass, bad_array_klass, bad_array_length;
+      __ check_klass_subtype(rdx_array_klass, rbx_klass, rdi, ok_array_klass);
+      // If we get here, the type check failed!
+      __ jmp(bad_array_klass);
+      __ bind(ok_array_klass);
+
+      // Check length.
+      if (length_constant >= 0) {
+        __ cmpl(Address(rsi_array, length_offset), length_constant);
+      } else {
+        Register rbx_vminfo = rbx_temp;
+        __ movl(rbx_vminfo, rcx_amh_conversion);
+        assert(CONV_VMINFO_SHIFT == 0, "preshifted");
+        __ andl(rbx_vminfo, CONV_VMINFO_MASK);
+        __ cmpl(rbx_vminfo, Address(rsi_array, length_offset));
+      }
+      __ jcc(Assembler::notEqual, bad_array_length);
+
+      Register rdx_argslot_limit = rdx_temp;
+
+      // Array length checks out.  Now insert any required stack slots.
+      if (length_constant == -1) {
+        // Form a pointer to the end of the affected region.
+        __ lea(rdx_argslot_limit, Address(rax_argslot, Interpreter::stackElementSize()));
+        // 'stack_move' is negative number of words to insert
+        Register rdi_stack_move = rdi;
+        __ movl(rdi_stack_move, rcx_amh_conversion);
+        __ sarl(rdi_stack_move, CONV_STACK_MOVE_SHIFT);
+        Register rsi_temp = rsi_array;  // spill this
+        insert_arg_slots(_masm, rdi_stack_move, -1,
+                         rax_argslot, rbx_temp, rsi_temp);
+        // reload the array (since rsi was killed)
+        __ movptr(rsi_array, vmarg);
+      } else if (length_constant > 1) {
+        int arg_mask = 0;
+        int new_slots = (length_constant - 1);
+        for (int i = 0; i < new_slots; i++) {
+          arg_mask <<= 1;
+          arg_mask |= _INSERT_REF_MASK;
+        }
+        insert_arg_slots(_masm, new_slots * stack_move_unit(), arg_mask,
+                         rax_argslot, rbx_temp, rdx_temp);
+      } else if (length_constant == 1) {
+        // no stack resizing required
+      } else if (length_constant == 0) {
+        remove_arg_slots(_masm, -stack_move_unit(),
+                         rax_argslot, rbx_temp, rdx_temp);
+      }
+
+      // Copy from the array to the new slots.
+      // Note: Stack change code preserves integrity of rax_argslot pointer.
+      // So even after slot insertions, rax_argslot still points to first argument.
+      if (length_constant == -1) {
+        // [rax_argslot, rdx_argslot_limit) is the area we are inserting into.
+        Register rsi_source = rsi_array;
+        __ lea(rsi_source, Address(rsi_array, elem0_offset));
+        Label loop;
+        __ bind(loop);
+        __ movptr(rbx_temp, Address(rsi_source, 0));
+        __ movptr(Address(rax_argslot, 0), rbx_temp);
+        __ addptr(rsi_source, type2aelembytes(elem_type));
+        if (TaggedStackInterpreter) {
+          __ movptr(Address(rax_argslot, tag_offset),
+                    frame::tag_for_basic_type(elem_type));
+        }
+        __ addptr(rax_argslot, Interpreter::stackElementSize());
+        __ cmpptr(rax_argslot, rdx_argslot_limit);
+        __ jcc(Assembler::less, loop);
+      } else if (length_constant == 0) {
+        __ bind(skip_array_check);
+        // nothing to copy
+      } else {
+        int elem_offset = elem0_offset;
+        int slot_offset = 0;
+        for (int index = 0; index < length_constant; index++) {
+          __ movptr(rbx_temp, Address(rsi_array, elem_offset));
+          __ movptr(Address(rax_argslot, slot_offset), rbx_temp);
+          elem_offset += type2aelembytes(elem_type);
+          if (TaggedStackInterpreter) {
+            __ movptr(Address(rax_argslot, slot_offset + tag_offset),
+                      frame::tag_for_basic_type(elem_type));
+          }
+          slot_offset += Interpreter::stackElementSize();
+        }
+      }
+
+      // Arguments are spread.  Move to next method handle.
+      UNPUSH_RSI_RDI;
+      __ movptr(rcx_recv, rcx_mh_vmtarget);
+      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
+
+      __ bind(bad_array_klass);
+      UNPUSH_RSI_RDI;
+      __ stop("bad array klass NYI");
+
+      __ bind(bad_array_length);
+      UNPUSH_RSI_RDI;
+      __ stop("bad array length NYI");
+
+#undef UNPUSH_RSI_RDI
+    }
+    break;
+
+  case _adapter_flyby:
+  case _adapter_ricochet:
+    __ unimplemented(entry_name(ek)); // %%% FIXME: NYI
+    break;
+
+  default:  ShouldNotReachHere();
+  }
+  __ hlt();
+
+  address me_cookie = MethodHandleEntry::start_compiled_entry(_masm, interp_entry);
+  __ unimplemented(entry_name(ek)); // %%% FIXME: NYI
+
+  init_entry(ek, MethodHandleEntry::finish_compiled_entry(_masm, me_cookie));
+}
--- a/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -2219,6 +2219,16 @@
 
     // arraycopy stubs used by compilers
     generate_arraycopy_stubs();
+
+    // generic method handle stubs
+    if (EnableMethodHandles && SystemDictionary::MethodHandle_klass() != NULL) {
+      for (MethodHandles::EntryKind ek = MethodHandles::_EK_FIRST;
+           ek < MethodHandles::_EK_LIMIT;
+           ek = MethodHandles::EntryKind(1 + (int)ek)) {
+        StubCodeMark mark(this, "MethodHandle", MethodHandles::entry_name(ek));
+        MethodHandles::generate_method_handle_stub(_masm, ek);
+      }
+    }
   }
 
 
--- a/src/cpu/x86/vm/templateInterpreter_x86_32.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/templateInterpreter_x86_32.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -92,6 +92,33 @@
   return entry;
 }
 
+// Arguments are: required type at TOS+8, failing object (or NULL) at TOS+4.
+// pc at TOS (just for debugging)
+address TemplateInterpreterGenerator::generate_WrongMethodType_handler() {
+  address entry = __ pc();
+
+  __ pop(rbx);                  // actual failing object is at TOS
+  __ pop(rax);                  // required type is at TOS+4
+
+  __ verify_oop(rbx);
+  __ verify_oop(rax);
+
+  // Various method handle types use interpreter registers as temps.
+  __ restore_bcp();
+  __ restore_locals();
+
+  // Expression stack must be empty before entering the VM for an exception.
+  __ empty_expression_stack();
+  __ empty_FPU_stack();
+  __ call_VM(noreg,
+             CAST_FROM_FN_PTR(address,
+                              InterpreterRuntime::throw_WrongMethodTypeException),
+             // pass required type, failing object (or NULL)
+             rax, rbx);
+  return entry;
+}
+
+
 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
   assert(!pass_oop || message == NULL, "either oop or message but not both");
   address entry = __ pc();
@@ -1370,6 +1397,7 @@
     case Interpreter::empty                  : entry_point = ((InterpreterGenerator*)this)->generate_empty_entry();        break;
     case Interpreter::accessor               : entry_point = ((InterpreterGenerator*)this)->generate_accessor_entry();     break;
     case Interpreter::abstract               : entry_point = ((InterpreterGenerator*)this)->generate_abstract_entry();     break;
+    case Interpreter::method_handle          : entry_point = ((InterpreterGenerator*)this)->generate_method_handle_entry(); break;
 
     case Interpreter::java_lang_math_sin     : // fall thru
     case Interpreter::java_lang_math_cos     : // fall thru
@@ -1400,7 +1428,8 @@
   // be sure to change this if you add/subtract anything to/from the overhead area
   const int overhead_size = -frame::interpreter_frame_initial_sp_offset;
 
-  const int method_stack = (method->max_locals() + method->max_stack()) *
+  const int extra_stack = methodOopDesc::extra_stack_entries();
+  const int method_stack = (method->max_locals() + method->max_stack() + extra_stack) *
                            Interpreter::stackElementWords();
   return overhead_size + method_stack + stub_code;
 }
--- a/src/cpu/x86/vm/templateInterpreter_x86_64.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/cpu/x86/vm/templateInterpreter_x86_64.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2009 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
@@ -100,6 +100,26 @@
   return entry;
 }
 
+// Arguments are: required type in rarg1, failing object (or NULL) in rarg2
+address TemplateInterpreterGenerator::generate_WrongMethodType_handler() {
+  address entry = __ pc();
+
+  __ pop(c_rarg2);              // failing object is at TOS
+  __ pop(c_rarg1);              // required type is at TOS+8
+
+  // expression stack must be empty before entering the VM if an
+  // exception happened
+  __ empty_expression_stack();
+
+  __ call_VM(noreg,
+             CAST_FROM_FN_PTR(address,
+                              InterpreterRuntime::
+                              throw_WrongMethodTypeException),
+             // pass required type, failing object (or NULL)
+             c_rarg1, c_rarg2);
+  return entry;
+}
+
 address TemplateInterpreterGenerator::generate_exception_handler_common(
         const char* name, const char* message, bool pass_oop) {
   assert(!pass_oop || message == NULL, "either oop or message but not both");
@@ -1393,6 +1413,7 @@
   case Interpreter::empty                  : entry_point = ((InterpreterGenerator*) this)->generate_empty_entry();       break;
   case Interpreter::accessor               : entry_point = ((InterpreterGenerator*) this)->generate_accessor_entry();    break;
   case Interpreter::abstract               : entry_point = ((InterpreterGenerator*) this)->generate_abstract_entry();    break;
+  case Interpreter::method_handle          : entry_point = ((InterpreterGenerator*) this)->generate_method_handle_entry();break;
 
   case Interpreter::java_lang_math_sin     : // fall thru
   case Interpreter::java_lang_math_cos     : // fall thru
@@ -1423,7 +1444,8 @@
     -(frame::interpreter_frame_initial_sp_offset) + entry_size;
 
   const int stub_code = frame::entry_frame_after_call_words;
-  const int method_stack = (method->max_locals() + method->max_stack()) *
+  const int extra_stack = methodOopDesc::extra_stack_entries();
+  const int method_stack = (method->max_locals() + method->max_stack() + extra_stack) *
                            Interpreter::stackElementWords();
   return (overhead_size + method_stack + stub_code);
 }
--- a/src/share/vm/ci/ciMethod.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/ci/ciMethod.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1999-2009 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
@@ -675,6 +675,30 @@
 }
 
 // ------------------------------------------------------------------
+// invokedynamic support
+//
+bool ciMethod::is_method_handle_invoke() {
+  check_is_loaded();
+  bool flag = ((flags().as_int() & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS);
+#ifdef ASSERT
+  {
+    VM_ENTRY_MARK;
+    bool flag2 = get_methodOop()->is_method_handle_invoke();
+    assert(flag == flag2, "consistent");
+  }
+#endif //ASSERT
+  return flag;
+}
+
+ciInstance* ciMethod::method_handle_type() {
+  check_is_loaded();
+  VM_ENTRY_MARK;
+  oop mtype = get_methodOop()->method_handle_type();
+  return CURRENT_THREAD_ENV->get_object(mtype)->as_instance();
+}
+
+
+// ------------------------------------------------------------------
 // ciMethod::build_method_data
 //
 // Generate new methodDataOop objects at compile time.
--- a/src/share/vm/ci/ciMethod.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/ci/ciMethod.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1999-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1999-2009 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
@@ -207,6 +207,8 @@
   bool check_call(int refinfo_index, bool is_static) const;
   void build_method_data();  // make sure it exists in the VM also
   int scale_count(int count, float prof_factor = 1.);  // make MDO count commensurate with IIC
+  bool is_method_handle_invoke();
+  ciInstance* method_handle_type();
 
   // What kind of ciObject is this?
   bool is_method()                               { return true; }
--- a/src/share/vm/classfile/classFileParser.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/classFileParser.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1842,6 +1842,11 @@
     _has_vanilla_constructor = true;
   }
 
+  if (EnableMethodHandles && m->is_method_handle_invoke()) {
+    THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
+               "Method handle invokers must be defined internally to the VM", nullHandle);
+  }
+
   return m;
 }
 
@@ -2465,9 +2470,84 @@
 }
 
 
+// Force MethodHandle.vmentry to be an unmanaged pointer.
+// There is no way for a classfile to express this, so we must help it.
+void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
+                                                    typeArrayHandle* fields_ptr,
+                                                    FieldAllocationCount *fac_ptr,
+                                                    TRAPS) {
+  // Add fake fields for java.dyn.MethodHandle instances
+  //
+  // This is not particularly nice, but since there is no way to express
+  // a native wordSize field in Java, we must do it at this level.
+
+  if (!EnableMethodHandles)  return;
+
+  int word_sig_index = 0;
+  const int cp_size = cp->length();
+  for (int index = 1; index < cp_size; index++) {
+    if (cp->tag_at(index).is_utf8() &&
+        cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
+      word_sig_index = index;
+      break;
+    }
+  }
+
+  if (word_sig_index == 0)
+    THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
+              "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
+
+  bool found_vmentry = false;
+
+  const int n = (*fields_ptr)()->length();
+  for (int i = 0; i < n; i += instanceKlass::next_offset) {
+    int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
+    int sig_index  = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
+    int acc_flags  = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
+    symbolOop f_name = cp->symbol_at(name_index);
+    symbolOop f_sig  = cp->symbol_at(sig_index);
+    if (f_sig == vmSymbols::byte_signature() &&
+        f_name == vmSymbols::vmentry_name() &&
+        (acc_flags & JVM_ACC_STATIC) == 0) {
+      // Adjust the field type from byte to an unmanaged pointer.
+      assert(fac_ptr->nonstatic_byte_count > 0, "");
+      fac_ptr->nonstatic_byte_count -= 1;
+      (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset,
+                                   word_sig_index);
+      if (wordSize == jintSize) {
+        fac_ptr->nonstatic_word_count += 1;
+      } else {
+        fac_ptr->nonstatic_double_count += 1;
+      }
+
+      FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i+4);
+      assert(atype == NONSTATIC_BYTE, "");
+      FieldAllocationType new_atype = NONSTATIC_WORD;
+      if (wordSize > jintSize) {
+        if (Universe::field_type_should_be_aligned(T_LONG)) {
+          atype = NONSTATIC_ALIGNED_DOUBLE;
+        } else {
+          atype = NONSTATIC_DOUBLE;
+        }
+      }
+      (*fields_ptr)->ushort_at_put(i+4, new_atype);
+
+      found_vmentry = true;
+      break;
+    }
+  }
+
+  if (!found_vmentry)
+    THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
+              "missing vmentry byte field in java.dyn.MethodHandle");
+
+}
+
+
 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
                                                     Handle class_loader,
                                                     Handle protection_domain,
+                                                    KlassHandle host_klass,
                                                     GrowableArray<Handle>* cp_patches,
                                                     symbolHandle& parsed_name,
                                                     TRAPS) {
@@ -2500,6 +2580,7 @@
     }
   }
 
+  _host_klass = host_klass;
   _cp_patches = cp_patches;
 
   instanceKlassHandle nullHandle;
@@ -2808,6 +2889,11 @@
       java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
     }
 
+    // adjust the vmentry field declaration in java.dyn.MethodHandle
+    if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
+      java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
+    }
+
     // Add a fake "discovered" field if it is not present
     // for compatibility with earlier jdk's.
     if (class_name() == vmSymbols::java_lang_ref_Reference()
@@ -3134,7 +3220,7 @@
     this_klass->set_method_ordering(method_ordering());
     this_klass->set_initial_method_idnum(methods->length());
     this_klass->set_name(cp->klass_name_at(this_class_index));
-    if (LinkWellKnownClasses)  // I am well known to myself
+    if (LinkWellKnownClasses || is_anonymous())  // I am well known to myself
       cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
     this_klass->set_protection_domain(protection_domain());
     this_klass->set_fields_annotations(fields_annotations());
--- a/src/share/vm/classfile/classFileParser.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/classFileParser.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -33,6 +33,7 @@
   u2   _major_version;
   u2   _minor_version;
   symbolHandle _class_name;
+  KlassHandle _host_klass;
   GrowableArray<Handle>* _cp_patches; // overrides for CP entries
 
   bool _has_finalizer;
@@ -145,6 +146,11 @@
   // Adjust the next_nonstatic_oop_offset to place the fake fields
   // before any Java fields.
   void java_lang_Class_fix_post(int* next_nonstatic_oop_offset);
+  // Adjust the field allocation counts for java.dyn.MethodHandle to add
+  // a fake address (void*) field.
+  void java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
+                                     typeArrayHandle* fields_ptr,
+                                     FieldAllocationCount *fac_ptr, TRAPS);
 
   // Format checker methods
   void classfile_parse_error(const char* msg, TRAPS);
@@ -204,6 +210,10 @@
   char* skip_over_field_name(char* name, bool slash_ok, unsigned int length);
   char* skip_over_field_signature(char* signature, bool void_ok, unsigned int length, TRAPS);
 
+  bool is_anonymous() {
+    assert(AnonymousClasses || _host_klass.is_null(), "");
+    return _host_klass.not_null();
+  }
   bool has_cp_patch_at(int index) {
     assert(AnonymousClasses, "");
     assert(index >= 0, "oob");
@@ -249,11 +259,13 @@
                                      Handle protection_domain,
                                      symbolHandle& parsed_name,
                                      TRAPS) {
-    return parseClassFile(name, class_loader, protection_domain, NULL, parsed_name, THREAD);
+    KlassHandle no_host_klass;
+    return parseClassFile(name, class_loader, protection_domain, no_host_klass, NULL, parsed_name, THREAD);
   }
   instanceKlassHandle parseClassFile(symbolHandle name,
                                      Handle class_loader,
                                      Handle protection_domain,
+                                     KlassHandle host_klass,
                                      GrowableArray<Handle>* cp_patches,
                                      symbolHandle& parsed_name,
                                      TRAPS);
--- a/src/share/vm/classfile/dictionary.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/dictionary.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2009 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
@@ -549,6 +549,63 @@
   }
 }
 
+SymbolPropertyTable::SymbolPropertyTable(int table_size)
+  : Hashtable(table_size, sizeof(SymbolPropertyEntry))
+{
+}
+SymbolPropertyTable::SymbolPropertyTable(int table_size, HashtableBucket* t,
+                                         int number_of_entries)
+  : Hashtable(table_size, sizeof(SymbolPropertyEntry), t, number_of_entries)
+{
+}
+
+
+SymbolPropertyEntry* SymbolPropertyTable::find_entry(int index, unsigned int hash,
+                                                     symbolHandle sym) {
+  assert(index == index_for(sym), "incorrect index?");
+  for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
+    if (p->hash() == hash && p->symbol() == sym()) {
+      return p;
+    }
+  }
+  return NULL;
+}
+
+
+SymbolPropertyEntry* SymbolPropertyTable::add_entry(int index, unsigned int hash,
+                                                    symbolHandle sym) {
+  assert_locked_or_safepoint(SystemDictionary_lock);
+  assert(index == index_for(sym), "incorrect index?");
+  assert(find_entry(index, hash, sym) == NULL, "no double entry");
+
+  SymbolPropertyEntry* p = new_entry(hash, sym());
+  Hashtable::add_entry(index, p);
+  return p;
+}
+
+
+void SymbolPropertyTable::oops_do(OopClosure* f) {
+  for (int index = 0; index < table_size(); index++) {
+    for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
+      f->do_oop((oop*) p->symbol_addr());
+      if (p->property_oop() != NULL) {
+        f->do_oop(p->property_oop_addr());
+      }
+    }
+  }
+}
+
+void SymbolPropertyTable::methods_do(void f(methodOop)) {
+  for (int index = 0; index < table_size(); index++) {
+    for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
+      oop prop = p->property_oop();
+      if (prop != NULL && prop->is_method()) {
+        f((methodOop)prop);
+      }
+    }
+  }
+}
+
 
 // ----------------------------------------------------------------------------
 #ifndef PRODUCT
--- a/src/share/vm/classfile/dictionary.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/dictionary.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2009 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
@@ -217,3 +217,112 @@
     tty->print_cr("pd set = #%d", count);
   }
 };
+
+// Entry in a SymbolPropertyTable, mapping a single symbolOop
+// to a managed and an unmanaged pointer.
+class SymbolPropertyEntry : public HashtableEntry {
+  friend class VMStructs;
+ private:
+  oop     _property_oop;
+  address _property_data;
+
+ public:
+  symbolOop symbol() const          { return (symbolOop) literal(); }
+
+  oop      property_oop() const     { return _property_oop; }
+  void set_property_oop(oop p)      { _property_oop = p; }
+
+  address  property_data() const    { return _property_data; }
+  void set_property_data(address p) { _property_data = p; }
+
+  SymbolPropertyEntry* next() const {
+    return (SymbolPropertyEntry*)HashtableEntry::next();
+  }
+
+  SymbolPropertyEntry** next_addr() {
+    return (SymbolPropertyEntry**)HashtableEntry::next_addr();
+  }
+
+  oop* symbol_addr()                { return literal_addr(); }
+  oop* property_oop_addr()          { return &_property_oop; }
+
+  void print_on(outputStream* st) const {
+    symbol()->print_value_on(st);
+    st->print(" -> ");
+    bool printed = false;
+    if (property_oop() != NULL) {
+      property_oop()->print_value_on(st);
+      printed = true;
+    }
+    if (property_data() != NULL) {
+      if (printed)  st->print(" and ");
+      st->print(INTPTR_FORMAT, property_data());
+      printed = true;
+    }
+    st->print_cr(printed ? "" : "(empty)");
+  }
+};
+
+// A system-internal mapping of symbols to pointers, both managed
+// and unmanaged.  Used to record the auto-generation of each method
+// MethodHandle.invoke(S)T, for all signatures (S)T.
+class SymbolPropertyTable : public Hashtable {
+  friend class VMStructs;
+private:
+  SymbolPropertyEntry* bucket(int i) {
+    return (SymbolPropertyEntry*) Hashtable::bucket(i);
+  }
+
+  // The following method is not MT-safe and must be done under lock.
+  SymbolPropertyEntry** bucket_addr(int i) {
+    return (SymbolPropertyEntry**) Hashtable::bucket_addr(i);
+  }
+
+  void add_entry(int index, SymbolPropertyEntry* new_entry) {
+    ShouldNotReachHere();
+  }
+  void set_entry(int index, SymbolPropertyEntry* new_entry) {
+    ShouldNotReachHere();
+  }
+
+  SymbolPropertyEntry* new_entry(unsigned int hash, symbolOop symbol) {
+    SymbolPropertyEntry* entry = (SymbolPropertyEntry*) Hashtable::new_entry(hash, symbol);
+    entry->set_property_oop(NULL);
+    entry->set_property_data(NULL);
+    return entry;
+  }
+
+public:
+  SymbolPropertyTable(int table_size);
+  SymbolPropertyTable(int table_size, HashtableBucket* t, int number_of_entries);
+
+  void free_entry(SymbolPropertyEntry* entry) {
+    Hashtable::free_entry(entry);
+  }
+
+  unsigned int compute_hash(symbolHandle sym) {
+    // Use the regular identity_hash.
+    return Hashtable::compute_hash(sym);
+  }
+
+  // need not be locked; no state change
+  SymbolPropertyEntry* find_entry(int index, unsigned int hash, symbolHandle name);
+
+  // must be done under SystemDictionary_lock
+  SymbolPropertyEntry* add_entry(int index, unsigned int hash, symbolHandle name);
+
+  // GC support
+  void oops_do(OopClosure* f);
+  void methods_do(void f(methodOop));
+
+  // Sharing support
+  void dump(SerializeOopClosure* soc);
+  void restore(SerializeOopClosure* soc);
+  void reorder_dictionary();
+
+#ifndef PRODUCT
+  void print();
+#endif
+  void verify();
+};
+
--- a/src/share/vm/classfile/javaClasses.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/javaClasses.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -25,13 +25,24 @@
 # include "incls/_precompiled.incl"
 # include "incls/_javaClasses.cpp.incl"
 
+static bool find_field(instanceKlass* ik,
+                       symbolOop name_symbol, symbolOop signature_symbol,
+                       fieldDescriptor* fd,
+                       bool allow_super = false) {
+  if (allow_super)
+    return ik->find_field(name_symbol, signature_symbol, fd) != NULL;
+  else
+    return ik->find_local_field(name_symbol, signature_symbol, fd);
+}
+
 // Helpful routine for computing field offsets at run time rather than hardcoding them
 static void
 compute_offset(int &dest_offset,
-               klassOop klass_oop, symbolOop name_symbol, symbolOop signature_symbol) {
+               klassOop klass_oop, symbolOop name_symbol, symbolOop signature_symbol,
+               bool allow_super = false) {
   fieldDescriptor fd;
   instanceKlass* ik = instanceKlass::cast(klass_oop);
-  if (!ik->find_local_field(name_symbol, signature_symbol, &fd)) {
+  if (!find_field(ik, name_symbol, signature_symbol, &fd, allow_super)) {
     ResourceMark rm;
     tty->print_cr("Invalid layout of %s at %s", ik->external_name(), name_symbol->as_C_string());
     fatal("Invalid layout of preloaded class");
@@ -42,14 +53,16 @@
 // Same as above but for "optional" offsets that might not be present in certain JDK versions
 static void
 compute_optional_offset(int& dest_offset,
-                        klassOop klass_oop, symbolOop name_symbol, symbolOop signature_symbol) {
+                        klassOop klass_oop, symbolOop name_symbol, symbolOop signature_symbol,
+                        bool allow_super = false) {
   fieldDescriptor fd;
   instanceKlass* ik = instanceKlass::cast(klass_oop);
-  if (ik->find_local_field(name_symbol, signature_symbol, &fd)) {
+  if (find_field(ik, name_symbol, signature_symbol, &fd, allow_super)) {
     dest_offset = fd.offset();
   }
 }
 
+
 Handle java_lang_String::basic_create(int length, bool tenured, TRAPS) {
   // Create the String object first, so there's a chance that the String
   // and the char array it points to end up in the same cache line.
@@ -2107,13 +2120,324 @@
 }
 
 
+// Support for java_dyn_MethodHandle
+
+int java_dyn_MethodHandle::_type_offset;
+int java_dyn_MethodHandle::_vmtarget_offset;
+int java_dyn_MethodHandle::_vmentry_offset;
+int java_dyn_MethodHandle::_vmslots_offset;
+
+int sun_dyn_MemberName::_clazz_offset;
+int sun_dyn_MemberName::_name_offset;
+int sun_dyn_MemberName::_type_offset;
+int sun_dyn_MemberName::_flags_offset;
+int sun_dyn_MemberName::_vmtarget_offset;
+int sun_dyn_MemberName::_vmindex_offset;
+
+int sun_dyn_DirectMethodHandle::_vmindex_offset;
+
+int sun_dyn_BoundMethodHandle::_argument_offset;
+int sun_dyn_BoundMethodHandle::_vmargslot_offset;
+
+int sun_dyn_AdapterMethodHandle::_conversion_offset;
+
+void java_dyn_MethodHandle::compute_offsets() {
+  klassOop k = SystemDictionary::MethodHandle_klass();
+  if (k != NULL && EnableMethodHandles) {
+    compute_offset(_type_offset,      k, vmSymbols::type_name(),      vmSymbols::java_dyn_MethodType_signature(), true);
+    compute_offset(_vmtarget_offset,  k, vmSymbols::vmtarget_name(),  vmSymbols::object_signature(), true);
+    compute_offset(_vmentry_offset,   k, vmSymbols::vmentry_name(),   vmSymbols::machine_word_signature(), true);
+
+    // Note:  MH.vmslots (if it is present) is a hoisted copy of MH.type.form.vmslots.
+    // It is optional pending experiments to keep or toss.
+    compute_optional_offset(_vmslots_offset, k, vmSymbols::vmslots_name(), vmSymbols::int_signature(), true);
+  }
+}
+
+void sun_dyn_MemberName::compute_offsets() {
+  klassOop k = SystemDictionary::MemberName_klass();
+  if (k != NULL && EnableMethodHandles) {
+    compute_offset(_clazz_offset,     k, vmSymbols::clazz_name(),     vmSymbols::class_signature());
+    compute_offset(_name_offset,      k, vmSymbols::name_name(),      vmSymbols::string_signature());
+    compute_offset(_type_offset,      k, vmSymbols::type_name(),      vmSymbols::object_signature());
+    compute_offset(_flags_offset,     k, vmSymbols::flags_name(),     vmSymbols::int_signature());
+    compute_offset(_vmtarget_offset,  k, vmSymbols::vmtarget_name(),  vmSymbols::object_signature());
+    compute_offset(_vmindex_offset,   k, vmSymbols::vmindex_name(),   vmSymbols::int_signature());
+  }
+}
+
+void sun_dyn_DirectMethodHandle::compute_offsets() {
+  klassOop k = SystemDictionary::DirectMethodHandle_klass();
+  if (k != NULL && EnableMethodHandles) {
+    compute_offset(_vmindex_offset,   k, vmSymbols::vmindex_name(),   vmSymbols::int_signature(),    true);
+  }
+}
+
+void sun_dyn_BoundMethodHandle::compute_offsets() {
+  klassOop k = SystemDictionary::BoundMethodHandle_klass();
+  if (k != NULL && EnableMethodHandles) {
+    compute_offset(_vmargslot_offset, k, vmSymbols::vmargslot_name(), vmSymbols::int_signature(),    true);
+    compute_offset(_argument_offset,  k, vmSymbols::argument_name(),  vmSymbols::object_signature(), true);
+  }
+}
+
+void sun_dyn_AdapterMethodHandle::compute_offsets() {
+  klassOop k = SystemDictionary::AdapterMethodHandle_klass();
+  if (k != NULL && EnableMethodHandles) {
+    compute_offset(_conversion_offset, k, vmSymbols::conversion_name(), vmSymbols::int_signature(), true);
+  }
+}
+
+oop java_dyn_MethodHandle::type(oop mh) {
+  return mh->obj_field(_type_offset);
+}
+
+void java_dyn_MethodHandle::set_type(oop mh, oop mtype) {
+  mh->obj_field_put(_type_offset, mtype);
+}
+
+int java_dyn_MethodHandle::vmslots(oop mh) {
+  int vmslots_offset = _vmslots_offset;
+  if (vmslots_offset != 0) {
+#ifdef ASSERT
+    int x = mh->int_field(vmslots_offset);
+    int y = compute_vmslots(mh);
+    assert(x == y, "correct hoisted value");
+#endif
+    return mh->int_field(vmslots_offset);
+  } else {
+    return compute_vmslots(mh);
+  }
+}
+
+// if MH.vmslots exists, hoist into it the value of type.form.vmslots
+void java_dyn_MethodHandle::init_vmslots(oop mh) {
+  int vmslots_offset = _vmslots_offset;
+  if (vmslots_offset != 0) {
+    mh->int_field_put(vmslots_offset, compute_vmslots(mh));
+  }
+}
+
+// fetch type.form.vmslots, which is the number of JVM stack slots
+// required to carry the arguments of this MH
+int java_dyn_MethodHandle::compute_vmslots(oop mh) {
+  oop mtype = type(mh);
+  if (mtype == NULL)  return 0;  // Java code would get NPE
+  oop form = java_dyn_MethodType::form(mtype);
+  if (form == NULL)   return 0;  // Java code would get NPE
+  return java_dyn_MethodTypeForm::vmslots(form);
+}
+
+// fetch the low-level entry point for this mh
+MethodHandleEntry* java_dyn_MethodHandle::vmentry(oop mh) {
+  return (MethodHandleEntry*) mh->address_field(_vmentry_offset);
+}
+
+void java_dyn_MethodHandle::set_vmentry(oop mh, MethodHandleEntry* me) {
+  assert(_vmentry_offset != 0, "must be present");
+
+  // This is always the final step that initializes a valid method handle:
+  mh->release_address_field_put(_vmentry_offset, (address) me);
+
+  // There should be enough memory barriers on exit from native methods
+  // to ensure that the MH is fully initialized to all threads before
+  // Java code can publish it in global data structures.
+  // But just in case, we use release_address_field_put.
+}
+
+/// MemberName accessors
+
+oop sun_dyn_MemberName::clazz(oop mname) {
+  assert(is_instance(mname), "wrong type");
+  return mname->obj_field(_clazz_offset);
+}
+
+void sun_dyn_MemberName::set_clazz(oop mname, oop clazz) {
+  assert(is_instance(mname), "wrong type");
+  mname->obj_field_put(_clazz_offset, clazz);
+}
+
+oop sun_dyn_MemberName::name(oop mname) {
+  assert(is_instance(mname), "wrong type");
+  return mname->obj_field(_name_offset);
+}
+
+void sun_dyn_MemberName::set_name(oop mname, oop name) {
+  assert(is_instance(mname), "wrong type");
+  mname->obj_field_put(_name_offset, name);
+}
+
+oop sun_dyn_MemberName::type(oop mname) {
+  assert(is_instance(mname), "wrong type");
+  return mname->obj_field(_type_offset);
+}
+
+void sun_dyn_MemberName::set_type(oop mname, oop type) {
+  assert(is_instance(mname), "wrong type");
+  mname->obj_field_put(_type_offset, type);
+}
+
+int sun_dyn_MemberName::flags(oop mname) {
+  assert(is_instance(mname), "wrong type");
+  return mname->int_field(_flags_offset);
+}
+
+void sun_dyn_MemberName::set_flags(oop mname, int flags) {
+  assert(is_instance(mname), "wrong type");
+  mname->int_field_put(_flags_offset, flags);
+}
+
+oop sun_dyn_MemberName::vmtarget(oop mname) {
+  assert(is_instance(mname), "wrong type");
+  return mname->obj_field(_vmtarget_offset);
+}
+
+void sun_dyn_MemberName::set_vmtarget(oop mname, oop ref) {
+  assert(is_instance(mname), "wrong type");
+  mname->obj_field_put(_vmtarget_offset, ref);
+}
+
+int sun_dyn_MemberName::vmindex(oop mname) {
+  assert(is_instance(mname), "wrong type");
+  return mname->int_field(_vmindex_offset);
+}
+
+void sun_dyn_MemberName::set_vmindex(oop mname, int index) {
+  assert(is_instance(mname), "wrong type");
+  mname->int_field_put(_vmindex_offset, index);
+}
+
+oop java_dyn_MethodHandle::vmtarget(oop mh) {
+  assert(is_instance(mh), "MH only");
+  return mh->obj_field(_vmtarget_offset);
+}
+
+void java_dyn_MethodHandle::set_vmtarget(oop mh, oop ref) {
+  assert(is_instance(mh), "MH only");
+  mh->obj_field_put(_vmtarget_offset, ref);
+}
+
+int sun_dyn_DirectMethodHandle::vmindex(oop mh) {
+  assert(is_instance(mh), "DMH only");
+  return mh->int_field(_vmindex_offset);
+}
+
+void sun_dyn_DirectMethodHandle::set_vmindex(oop mh, int index) {
+  assert(is_instance(mh), "DMH only");
+  mh->int_field_put(_vmindex_offset, index);
+}
+
+int sun_dyn_BoundMethodHandle::vmargslot(oop mh) {
+  assert(is_instance(mh), "BMH only");
+  return mh->int_field(_vmargslot_offset);
+}
+
+oop sun_dyn_BoundMethodHandle::argument(oop mh) {
+  assert(is_instance(mh), "BMH only");
+  return mh->obj_field(_argument_offset);
+}
+
+int sun_dyn_AdapterMethodHandle::conversion(oop mh) {
+  assert(is_instance(mh), "AMH only");
+  return mh->int_field(_conversion_offset);
+}
+
+void sun_dyn_AdapterMethodHandle::set_conversion(oop mh, int conv) {
+  assert(is_instance(mh), "AMH only");
+  mh->int_field_put(_conversion_offset, conv);
+}
+
+
+// Support for java_dyn_MethodType
+
+int java_dyn_MethodType::_rtype_offset;
+int java_dyn_MethodType::_ptypes_offset;
+int java_dyn_MethodType::_form_offset;
+
+void java_dyn_MethodType::compute_offsets() {
+  klassOop k = SystemDictionary::MethodType_klass();
+  if (k != NULL) {
+    compute_offset(_rtype_offset,  k, vmSymbols::rtype_name(),  vmSymbols::class_signature());
+    compute_offset(_ptypes_offset, k, vmSymbols::ptypes_name(), vmSymbols::class_array_signature());
+    compute_offset(_form_offset,   k, vmSymbols::form_name(),   vmSymbols::java_dyn_MethodTypeForm_signature());
+  }
+}
+
+void java_dyn_MethodType::print_signature(oop mt, outputStream* st) {
+  st->print("(");
+  objArrayOop pts = ptypes(mt);
+  for (int i = 0, limit = pts->length(); i < limit; i++) {
+    java_lang_Class::print_signature(pts->obj_at(i), st);
+  }
+  st->print(")");
+  java_lang_Class::print_signature(rtype(mt), st);
+}
+
+symbolOop java_dyn_MethodType::as_signature(oop mt, bool intern_if_not_found, TRAPS) {
+  ResourceMark rm;
+  stringStream buffer(128);
+  print_signature(mt, &buffer);
+  const char* sigstr =       buffer.base();
+  int         siglen = (int) buffer.size();
+  if (!intern_if_not_found)
+    return SymbolTable::probe(sigstr, siglen);
+  else
+    return oopFactory::new_symbol(sigstr, siglen, THREAD);
+}
+
+oop java_dyn_MethodType::rtype(oop mt) {
+  assert(is_instance(mt), "must be a MethodType");
+  return mt->obj_field(_rtype_offset);
+}
+
+objArrayOop java_dyn_MethodType::ptypes(oop mt) {
+  assert(is_instance(mt), "must be a MethodType");
+  return (objArrayOop) mt->obj_field(_ptypes_offset);
+}
+
+oop java_dyn_MethodType::form(oop mt) {
+  assert(is_instance(mt), "must be a MethodType");
+  return mt->obj_field(_form_offset);
+}
+
+oop java_dyn_MethodType::ptype(oop mt, int idx) {
+  return ptypes(mt)->obj_at(idx);
+}
+
+
+
+// Support for java_dyn_MethodTypeForm
+
+int java_dyn_MethodTypeForm::_vmslots_offset;
+int java_dyn_MethodTypeForm::_erasedType_offset;
+
+void java_dyn_MethodTypeForm::compute_offsets() {
+  klassOop k = SystemDictionary::MethodTypeForm_klass();
+  if (k != NULL) {
+    compute_optional_offset(_vmslots_offset,    k, vmSymbols::vmslots_name(),    vmSymbols::int_signature(), true);
+    compute_optional_offset(_erasedType_offset, k, vmSymbols::erasedType_name(), vmSymbols::java_dyn_MethodType_signature(), true);
+  }
+}
+
+int java_dyn_MethodTypeForm::vmslots(oop mtform) {
+  assert(mtform->klass() == SystemDictionary::MethodTypeForm_klass(), "MTForm only");
+  return mtform->int_field(_vmslots_offset);
+}
+
+oop java_dyn_MethodTypeForm::erasedType(oop mtform) {
+  assert(mtform->klass() == SystemDictionary::MethodTypeForm_klass(), "MTForm only");
+  return mtform->obj_field(_erasedType_offset);
+}
+
+
+
+
 // Support for java_security_AccessControlContext
 
 int java_security_AccessControlContext::_context_offset = 0;
 int java_security_AccessControlContext::_privilegedContext_offset = 0;
 int java_security_AccessControlContext::_isPrivileged_offset = 0;
 
-
 void java_security_AccessControlContext::compute_offsets() {
   assert(_isPrivileged_offset == 0, "offsets should be initialized only once");
   fieldDescriptor fd;
@@ -2442,6 +2766,15 @@
   java_lang_System::compute_offsets();
   java_lang_Thread::compute_offsets();
   java_lang_ThreadGroup::compute_offsets();
+  if (EnableMethodHandles) {
+    java_dyn_MethodHandle::compute_offsets();
+    sun_dyn_MemberName::compute_offsets();
+    sun_dyn_DirectMethodHandle::compute_offsets();
+    sun_dyn_BoundMethodHandle::compute_offsets();
+    sun_dyn_AdapterMethodHandle::compute_offsets();
+    java_dyn_MethodType::compute_offsets();
+    java_dyn_MethodTypeForm::compute_offsets();
+  }
   java_security_AccessControlContext::compute_offsets();
   // Initialize reflection classes. The layouts of these classes
   // changed with the new reflection implementation in JDK 1.4, and
@@ -2459,6 +2792,9 @@
     sun_reflect_UnsafeStaticFieldAccessorImpl::compute_offsets();
   }
   sun_misc_AtomicLongCSImpl::compute_offsets();
+
+  // generated interpreter code wants to know about the offsets we just computed:
+  AbstractAssembler::update_delayed_values();
 }
 
 #ifndef PRODUCT
--- a/src/share/vm/classfile/javaClasses.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/javaClasses.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -151,6 +151,12 @@
   // Conversion
   static klassOop as_klassOop(oop java_class);
   static BasicType as_BasicType(oop java_class, klassOop* reference_klass = NULL);
+  static BasicType as_BasicType(oop java_class, KlassHandle* reference_klass) {
+    klassOop refk_oop = NULL;
+    BasicType result = as_BasicType(java_class, &refk_oop);
+    (*reference_klass) = KlassHandle(refk_oop);
+    return result;
+  }
   static symbolOop as_signature(oop java_class, bool intern_if_not_found, TRAPS);
   static void print_signature(oop java_class, outputStream *st);
   // Testing
@@ -778,6 +784,284 @@
 };
 
 
+// Interface to java.dyn.MethodHandle objects
+
+class MethodHandleEntry;
+
+class java_dyn_MethodHandle: AllStatic {
+  friend class JavaClasses;
+
+ private:
+  static int _vmentry_offset;           // assembly code trampoline for MH
+  static int _vmtarget_offset;          // class-specific target reference
+  static int _type_offset;              // the MethodType of this MH
+  static int _vmslots_offset;           // OPTIONAL hoisted type.form.vmslots
+
+  static void compute_offsets();
+
+ public:
+  // Accessors
+  static oop            type(oop mh);
+  static void       set_type(oop mh, oop mtype);
+
+  static oop            vmtarget(oop mh);
+  static void       set_vmtarget(oop mh, oop target);
+
+  static MethodHandleEntry* vmentry(oop mh);
+  static void       set_vmentry(oop mh, MethodHandleEntry* data);
+
+  static int            vmslots(oop mh);
+  static void      init_vmslots(oop mh);
+  static int    compute_vmslots(oop mh);
+
+  // Testers
+  static bool is_subclass(klassOop klass) {
+    return Klass::cast(klass)->is_subclass_of(SystemDictionary::MethodHandle_klass());
+  }
+  static bool is_instance(oop obj) {
+    return obj != NULL && is_subclass(obj->klass());
+  }
+
+  // Accessors for code generation:
+  static int type_offset_in_bytes()             { return _type_offset; }
+  static int vmtarget_offset_in_bytes()         { return _vmtarget_offset; }
+  static int vmentry_offset_in_bytes()          { return _vmentry_offset; }
+  static int vmslots_offset_in_bytes()          { return _vmslots_offset; }
+};
+
+class sun_dyn_DirectMethodHandle: public java_dyn_MethodHandle {
+  friend class JavaClasses;
+
+ private:
+  //         _vmtarget_offset;          // method   or class      or interface
+  static int _vmindex_offset;           // negative or vtable idx or itable idx
+  static void compute_offsets();
+
+ public:
+  // Accessors
+  static int            vmindex(oop mh);
+  static void       set_vmindex(oop mh, int index);
+
+  // Testers
+  static bool is_subclass(klassOop klass) {
+    return Klass::cast(klass)->is_subclass_of(SystemDictionary::DirectMethodHandle_klass());
+  }
+  static bool is_instance(oop obj) {
+    return obj != NULL && is_subclass(obj->klass());
+  }
+
+  // Accessors for code generation:
+  static int vmindex_offset_in_bytes()          { return _vmindex_offset; }
+};
+
+class sun_dyn_BoundMethodHandle: public java_dyn_MethodHandle {
+  friend class JavaClasses;
+
+ private:
+  static int _argument_offset;          // argument value bound into this MH
+  static int _vmargslot_offset;         // relevant argument slot (<= vmslots)
+  static void compute_offsets();
+
+public:
+  static oop            argument(oop mh);
+  static void       set_argument(oop mh, oop ref);
+
+  static jint           vmargslot(oop mh);
+  static void       set_vmargslot(oop mh, jint slot);
+
+  // Testers
+  static bool is_subclass(klassOop klass) {
+    return Klass::cast(klass)->is_subclass_of(SystemDictionary::BoundMethodHandle_klass());
+  }
+  static bool is_instance(oop obj) {
+    return obj != NULL && is_subclass(obj->klass());
+  }
+
+  static int argument_offset_in_bytes()         { return _argument_offset; }
+  static int vmargslot_offset_in_bytes()        { return _vmargslot_offset; }
+};
+
+class sun_dyn_AdapterMethodHandle: public sun_dyn_BoundMethodHandle {
+  friend class JavaClasses;
+
+ private:
+  static int _conversion_offset;        // type of conversion to apply
+  static void compute_offsets();
+
+ public:
+  static int            conversion(oop mh);
+  static void       set_conversion(oop mh, int conv);
+
+  // Testers
+  static bool is_subclass(klassOop klass) {
+    return Klass::cast(klass)->is_subclass_of(SystemDictionary::AdapterMethodHandle_klass());
+  }
+  static bool is_instance(oop obj) {
+    return obj != NULL && is_subclass(obj->klass());
+  }
+
+  // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants):
+  enum {
+    OP_RETYPE_ONLY   = 0x0, // no argument changes; straight retype
+    OP_CHECK_CAST    = 0x1, // ref-to-ref conversion; requires a Class argument
+    OP_PRIM_TO_PRIM  = 0x2, // converts from one primitive to another
+    OP_REF_TO_PRIM   = 0x3, // unboxes a wrapper to produce a primitive
+    OP_PRIM_TO_REF   = 0x4, // boxes a primitive into a wrapper (NYI)
+    OP_SWAP_ARGS     = 0x5, // swap arguments (vminfo is 2nd arg)
+    OP_ROT_ARGS      = 0x6, // rotate arguments (vminfo is displaced arg)
+    OP_DUP_ARGS      = 0x7, // duplicates one or more arguments (at TOS)
+    OP_DROP_ARGS     = 0x8, // remove one or more argument slots
+    OP_COLLECT_ARGS  = 0x9, // combine one or more arguments into a varargs (NYI)
+    OP_SPREAD_ARGS   = 0xA, // expand in place a varargs array (of known size)
+    OP_FLYBY         = 0xB, // operate first on reified argument list (NYI)
+    OP_RICOCHET      = 0xC, // run an adapter chain on the return value (NYI)
+    CONV_OP_LIMIT    = 0xD, // limit of CONV_OP enumeration
+
+    CONV_OP_MASK     = 0xF00, // this nybble contains the conversion op field
+    CONV_VMINFO_MASK = 0x0FF, // LSB is reserved for JVM use
+    CONV_VMINFO_SHIFT     =  0, // position of bits in CONV_VMINFO_MASK
+    CONV_OP_SHIFT         =  8, // position of bits in CONV_OP_MASK
+    CONV_DEST_TYPE_SHIFT  = 12, // byte 2 has the adapter BasicType (if needed)
+    CONV_SRC_TYPE_SHIFT   = 16, // byte 2 has the source BasicType (if needed)
+    CONV_STACK_MOVE_SHIFT = 20, // high 12 bits give signed SP change
+    CONV_STACK_MOVE_MASK  = (1 << (32 - CONV_STACK_MOVE_SHIFT)) - 1
+  };
+
+  static int conversion_offset_in_bytes()       { return _conversion_offset; }
+};
+
+
+// Interface to sun.dyn.MemberName objects
+// (These are a private interface for Java code to query the class hierarchy.)
+
+class sun_dyn_MemberName: AllStatic {
+  friend class JavaClasses;
+
+ private:
+  // From java.dyn.MemberName:
+  //    private Class<?>   clazz;       // class in which the method is defined
+  //    private String     name;        // may be null if not yet materialized
+  //    private Object     type;        // may be null if not yet materialized
+  //    private int        flags;       // modifier bits; see reflect.Modifier
+  //    private Object     vmtarget;    // VM-specific target value
+  //    private int        vmindex;     // method index within class or interface
+  static int _clazz_offset;
+  static int _name_offset;
+  static int _type_offset;
+  static int _flags_offset;
+  static int _vmtarget_offset;
+  static int _vmindex_offset;
+
+  static void compute_offsets();
+
+ public:
+  // Accessors
+  static oop            clazz(oop mname);
+  static void       set_clazz(oop mname, oop clazz);
+
+  static oop            type(oop mname);
+  static void       set_type(oop mname, oop type);
+
+  static oop            name(oop mname);
+  static void       set_name(oop mname, oop name);
+
+  static int            flags(oop mname);
+  static void       set_flags(oop mname, int flags);
+
+  static int            modifiers(oop mname) { return (u2) flags(mname); }
+  static void       set_modifiers(oop mname, int mods)
+                                { set_flags(mname, (flags(mname) &~ (u2)-1) | (u2)mods); }
+
+  static oop            vmtarget(oop mname);
+  static void       set_vmtarget(oop mname, oop target);
+
+  static int            vmindex(oop mname);
+  static void       set_vmindex(oop mname, int index);
+
+  // Testers
+  static bool is_subclass(klassOop klass) {
+    return Klass::cast(klass)->is_subclass_of(SystemDictionary::MemberName_klass());
+  }
+  static bool is_instance(oop obj) {
+    return obj != NULL && is_subclass(obj->klass());
+  }
+
+  // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants):
+  enum {
+    MN_IS_METHOD           = 0x00010000, // method (not constructor)
+    MN_IS_CONSTRUCTOR      = 0x00020000, // constructor
+    MN_IS_FIELD            = 0x00040000, // field
+    MN_IS_TYPE             = 0x00080000, // nested type
+    MN_SEARCH_SUPERCLASSES = 0x00100000, // for MHN.getMembers
+    MN_SEARCH_INTERFACES   = 0x00200000, // for MHN.getMembers
+    VM_INDEX_UNINITIALIZED = -99
+  };
+
+  // Accessors for code generation:
+  static int clazz_offset_in_bytes()            { return _clazz_offset; }
+  static int type_offset_in_bytes()             { return _type_offset; }
+  static int name_offset_in_bytes()             { return _name_offset; }
+  static int flags_offset_in_bytes()            { return _flags_offset; }
+  static int vmtarget_offset_in_bytes()         { return _vmtarget_offset; }
+  static int vmindex_offset_in_bytes()          { return _vmindex_offset; }
+};
+
+
+// Interface to java.dyn.MethodType objects
+
+class java_dyn_MethodType: AllStatic {
+  friend class JavaClasses;
+
+ private:
+  static int _rtype_offset;
+  static int _ptypes_offset;
+  static int _form_offset;
+
+  static void compute_offsets();
+
+ public:
+  // Accessors
+  static oop            rtype(oop mt);
+  static objArrayOop    ptypes(oop mt);
+  static oop            form(oop mt);
+
+  static oop            ptype(oop mt, int index);
+
+  static symbolOop      as_signature(oop mt, bool intern_if_not_found, TRAPS);
+  static void           print_signature(oop mt, outputStream* st);
+
+  static bool is_instance(oop obj) {
+    return obj != NULL && obj->klass() == SystemDictionary::MethodType_klass();
+  }
+
+  // Accessors for code generation:
+  static int rtype_offset_in_bytes()            { return _rtype_offset; }
+  static int ptypes_offset_in_bytes()           { return _ptypes_offset; }
+  static int form_offset_in_bytes()             { return _form_offset; }
+};
+
+class java_dyn_MethodTypeForm: AllStatic {
+  friend class JavaClasses;
+
+ private:
+  static int _vmslots_offset;           // number of argument slots needed
+  static int _erasedType_offset;        // erasedType = canonical MethodType
+
+  static void compute_offsets();
+
+ public:
+  // Accessors
+  static int            vmslots(oop mtform);
+  static oop            erasedType(oop mtform);
+
+  // Accessors for code generation:
+  static int vmslots_offset_in_bytes()          { return _vmslots_offset; }
+  static int erasedType_offset_in_bytes()       { return _erasedType_offset; }
+};
+
+
+
+
 // Interface to java.security.AccessControlContext objects
 
 class java_security_AccessControlContext: AllStatic {
--- a/src/share/vm/classfile/systemDictionary.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/systemDictionary.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -31,6 +31,7 @@
 Dictionary*       SystemDictionary::_shared_dictionary = NULL;
 LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL;
 ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL;
+SymbolPropertyTable* SystemDictionary::_invoke_method_table = NULL;
 
 
 int         SystemDictionary::_number_of_modifications = 0;
@@ -966,6 +967,8 @@
   instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
                                                              class_loader,
                                                              protection_domain,
+                                                             host_klass,
+                                                             cp_patches,
                                                              parsed_name,
                                                              THREAD);
 
@@ -1691,6 +1694,10 @@
   // represent classes we're actively loading.
   placeholders_do(blk);
 
+  // Visit extra methods
+  if (invoke_method_table() != NULL)
+    invoke_method_table()->oops_do(blk);
+
   // Loader constraints. We must keep the symbolOop used in the name alive.
   constraints()->always_strong_classes_do(blk);
 
@@ -1726,6 +1733,10 @@
   // Adjust dictionary
   dictionary()->oops_do(f);
 
+  // Visit extra methods
+  if (invoke_method_table() != NULL)
+    invoke_method_table()->oops_do(f);
+
   // Partially loaded classes
   placeholders()->oops_do(f);
 
@@ -1798,6 +1809,8 @@
 
 void SystemDictionary::methods_do(void f(methodOop)) {
   dictionary()->methods_do(f);
+  if (invoke_method_table() != NULL)
+    invoke_method_table()->methods_do(f);
 }
 
 // ----------------------------------------------------------------------------
@@ -1830,6 +1843,7 @@
   _number_of_modifications = 0;
   _loader_constraints = new LoaderConstraintTable(_loader_constraint_size);
   _resolution_errors = new ResolutionErrorTable(_resolution_error_size);
+  // _invoke_method_table is allocated lazily in find_method_handle_invoke()
 
   // Allocate private object used as system class loader lock
   _system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK);
@@ -1891,6 +1905,9 @@
       wk_klass_name_limits[0] = s;
     }
   }
+
+  // move the starting value forward to the limit:
+  start_id = limit_id;
 }
 
 
@@ -1924,6 +1941,17 @@
   instanceKlass::cast(WK_KLASS(final_reference_klass))->set_reference_type(REF_FINAL);
   instanceKlass::cast(WK_KLASS(phantom_reference_klass))->set_reference_type(REF_PHANTOM);
 
+  WKID meth_group_start = WK_KLASS_ENUM_NAME(MethodHandle_klass);
+  WKID meth_group_end   = WK_KLASS_ENUM_NAME(WrongMethodTypeException_klass);
+  initialize_wk_klasses_until(meth_group_start, scan, CHECK);
+  if (EnableMethodHandles) {
+    initialize_wk_klasses_through(meth_group_start, scan, CHECK);
+  }
+  if (_well_known_klasses[meth_group_start] == NULL) {
+    // Skip the rest of the method handle classes, if MethodHandle is not loaded.
+    scan = WKID(meth_group_end+1);
+  }
+
   initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK);
 
   _box_klasses[T_BOOLEAN] = WK_KLASS(boolean_klass);
@@ -2254,6 +2282,91 @@
 }
 
 
+methodOop SystemDictionary::find_method_handle_invoke(symbolHandle signature,
+                                                      Handle class_loader,
+                                                      Handle protection_domain,
+                                                      TRAPS) {
+  if (!EnableMethodHandles)  return NULL;
+  assert(class_loader.is_null() && protection_domain.is_null(),
+         "cannot load specialized versions of MethodHandle.invoke");
+  if (invoke_method_table() == NULL) {
+    // create this side table lazily
+    _invoke_method_table = new SymbolPropertyTable(_invoke_method_size);
+  }
+  unsigned int hash  = invoke_method_table()->compute_hash(signature);
+  int          index = invoke_method_table()->hash_to_index(hash);
+  SymbolPropertyEntry* spe = invoke_method_table()->find_entry(index, hash, signature);
+  if (spe == NULL || spe->property_oop() == NULL) {
+    // Must create lots of stuff here, but outside of the SystemDictionary lock.
+    Handle mt = compute_method_handle_type(signature(),
+                                           class_loader, protection_domain,
+                                           CHECK_NULL);
+    KlassHandle  mh_klass = SystemDictionaryHandles::MethodHandle_klass();
+    methodHandle m = methodOopDesc::make_invoke_method(mh_klass, signature,
+                                                       mt, CHECK_NULL);
+    // Now grab the lock.  We might have to throw away the new method,
+    // if a racing thread has managed to install one at the same time.
+    {
+      MutexLocker ml(SystemDictionary_lock, Thread::current());
+      spe = invoke_method_table()->find_entry(index, hash, signature);
+      if (spe == NULL)
+        spe = invoke_method_table()->add_entry(index, hash, signature);
+      if (spe->property_oop() == NULL)
+        spe->set_property_oop(m());
+    }
+  }
+  methodOop m = (methodOop) spe->property_oop();
+  assert(m->is_method(), "");
+  return m;
+}
+
+// Ask Java code to find or construct a java.dyn.MethodType for the given
+// signature, as interpreted relative to the given class loader.
+// Because of class loader constraints, all method handle usage must be
+// consistent with this loader.
+Handle SystemDictionary::compute_method_handle_type(symbolHandle signature,
+                                                    Handle class_loader,
+                                                    Handle protection_domain,
+                                                    TRAPS) {
+  Handle empty;
+  int npts = ArgumentCount(signature()).size();
+  objArrayHandle pts = oopFactory::new_objArray(SystemDictionary::class_klass(), npts, CHECK_(empty));
+  int arg = 0;
+  Handle rt;                            // the return type from the signature
+  for (SignatureStream ss(signature()); !ss.is_done(); ss.next()) {
+    oop mirror;
+    if (!ss.is_object()) {
+      mirror = Universe::java_mirror(ss.type());
+    } else {
+      symbolOop    name_oop = ss.as_symbol(CHECK_(empty));
+      symbolHandle name(THREAD, name_oop);
+      klassOop klass = resolve_or_fail(name,
+                                       class_loader, protection_domain,
+                                       true, CHECK_(empty));
+      mirror = Klass::cast(klass)->java_mirror();
+    }
+    if (ss.at_return_type())
+      rt = Handle(THREAD, mirror);
+    else
+      pts->obj_at_put(arg++, mirror);
+  }
+  assert(arg == npts, "");
+
+  // call MethodType java.dyn.MethodType::makeImpl(Class rt, Class[] pts, false, true)
+  bool varargs = false, trusted = true;
+  JavaCallArguments args(Handle(THREAD, rt()));
+  args.push_oop(pts());
+  args.push_int(false);
+  args.push_int(trusted);
+  JavaValue result(T_OBJECT);
+  JavaCalls::call_static(&result,
+                         SystemDictionary::MethodType_klass(),
+                         vmSymbols::makeImpl_name(), vmSymbols::makeImpl_signature(),
+                         &args, CHECK_(empty));
+  return Handle(THREAD, (oop) result.get_jobject());
+}
+
+
 // Since the identity hash code for symbols changes when the symbols are
 // moved from the regular perm gen (hash in the mark word) to the shared
 // spaces (hash is the address), the classes loaded into the dictionary
--- a/src/share/vm/classfile/systemDictionary.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/systemDictionary.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -63,6 +63,7 @@
 class LoaderConstraintTable;
 class HashtableBucket;
 class ResolutionErrorTable;
+class SymbolPropertyTable;
 
 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
 // They are all "well-known", in the sense that no class loader is allowed
@@ -131,6 +132,16 @@
   template(reflect_constant_pool_klass,  sun_reflect_ConstantPool,       Opt_Only_JDK15) \
   template(reflect_unsafe_static_field_accessor_impl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \
                                                                               \
+  /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
+  template(MethodHandle_klass,           java_dyn_MethodHandle,          Opt) \
+  template(MemberName_klass,             sun_dyn_MemberName,             Opt) \
+  template(MethodHandleImpl_klass,       sun_dyn_MethodHandleImpl,       Opt) \
+  template(AdapterMethodHandle_klass,    sun_dyn_AdapterMethodHandle,    Opt) \
+  template(BoundMethodHandle_klass,      sun_dyn_BoundMethodHandle,      Opt) \
+  template(DirectMethodHandle_klass,     sun_dyn_DirectMethodHandle,     Opt) \
+  template(MethodType_klass,             java_dyn_MethodType,            Opt) \
+  template(MethodTypeForm_klass,         java_dyn_MethodTypeForm,        Opt) \
+  template(WrongMethodTypeException_klass, java_dyn_WrongMethodTypeException, Opt) \
   template(vector_klass,                 java_util_Vector,               Pre) \
   template(hashtable_klass,              java_util_Hashtable,            Pre) \
   template(stringBuffer_klass,           java_lang_StringBuffer,         Pre) \
@@ -444,6 +455,17 @@
   static char* check_signature_loaders(symbolHandle signature, Handle loader1,
                                        Handle loader2, bool is_method, TRAPS);
 
+  // JSR 292
+  // find the java.dyn.MethodHandles::invoke method for a given signature
+  static methodOop find_method_handle_invoke(symbolHandle signature,
+                                             Handle class_loader,
+                                             Handle protection_domain,
+                                             TRAPS);
+  // ask Java to compute the java.dyn.MethodType object for a given signature
+  static Handle    compute_method_handle_type(symbolHandle signature,
+                                              Handle class_loader,
+                                              Handle protection_domain,
+                                              TRAPS);
   // Utility for printing loader "name" as part of tracing constraints
   static const char* loader_name(oop loader) {
     return ((loader) == NULL ? "<bootloader>" :
@@ -460,6 +482,7 @@
   enum Constants {
     _loader_constraint_size = 107,                     // number of entries in constraint table
     _resolution_error_size  = 107,                     // number of entries in resolution error table
+    _invoke_method_size     = 139,                     // number of entries in invoke method table
     _nof_buckets            = 1009                     // number of buckets in hash table
   };
 
@@ -489,6 +512,9 @@
   // Resolution errors
   static ResolutionErrorTable*   _resolution_errors;
 
+  // Invoke methods (JSR 292)
+  static SymbolPropertyTable*    _invoke_method_table;
+
 public:
   // for VM_CounterDecay iteration support
   friend class CounterDecay;
@@ -506,6 +532,7 @@
   static PlaceholderTable*   placeholders() { return _placeholders; }
   static LoaderConstraintTable* constraints() { return _loader_constraints; }
   static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
+  static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
 
   // Basic loading operations
   static klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS);
--- a/src/share/vm/classfile/vmSymbols.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/classfile/vmSymbols.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -216,7 +216,26 @@
   template(sun_reflect_UnsafeStaticFieldAccessorImpl, "sun/reflect/UnsafeStaticFieldAccessorImpl")\
   template(base_name,                                 "base")                                     \
                                                                                                   \
-  /* common method names */                                                                       \
+  /* Support for JSR 292 & invokedynamic (JDK 1.7 and above) */                                   \
+  template(java_dyn_MethodHandle,                     "java/dyn/MethodHandle")                    \
+  template(java_dyn_MethodType,                       "java/dyn/MethodType")                      \
+  template(java_dyn_WrongMethodTypeException,         "java/dyn/WrongMethodTypeException")        \
+  template(java_dyn_MethodType_signature,             "Ljava/dyn/MethodType;")                    \
+  template(java_dyn_MethodHandle_signature,           "Ljava/dyn/MethodHandle;")                  \
+  /* internal classes known only to the JVM: */                                                   \
+  template(java_dyn_MethodTypeForm,                   "java/dyn/MethodTypeForm")                  \
+  template(java_dyn_MethodTypeForm_signature,         "Ljava/dyn/MethodTypeForm;")                \
+  template(sun_dyn_MemberName,                        "sun/dyn/MemberName")                       \
+  template(sun_dyn_MethodHandleImpl,                  "sun/dyn/MethodHandleImpl")                 \
+  template(sun_dyn_AdapterMethodHandle,               "sun/dyn/AdapterMethodHandle")              \
+  template(sun_dyn_BoundMethodHandle,                 "sun/dyn/BoundMethodHandle")                \
+  template(sun_dyn_DirectMethodHandle,                "sun/dyn/DirectMethodHandle")               \
+  template(makeImpl_name,                             "makeImpl") /*MethodType::makeImpl*/        \
+  template(makeImpl_signature,    "(Ljava/lang/Class;[Ljava/lang/Class;ZZ)Ljava/dyn/MethodType;") \
+  NOT_LP64(  do_alias(machine_word_signature,         int_signature)  )                           \
+  LP64_ONLY( do_alias(machine_word_signature,         long_signature) )                           \
+                                                                                                  \
+  /* common method and field names */                                                             \
   template(object_initializer_name,                   "<init>")                                   \
   template(class_initializer_name,                    "<clinit>")                                 \
   template(println_name,                              "println")                                  \
@@ -289,6 +308,21 @@
   template(bitCount_name,                             "bitCount")                                 \
   template(profile_name,                              "profile")                                  \
   template(equals_name,                               "equals")                                   \
+  template(toString_name,                             "toString")                                 \
+  template(values_name,                               "values")                                   \
+  template(receiver_name,                             "receiver")                                 \
+  template(vmtarget_name,                             "vmtarget")                                 \
+  template(vmentry_name,                              "vmentry")                                  \
+  template(vmslots_name,                              "vmslots")                                  \
+  template(vmindex_name,                              "vmindex")                                  \
+  template(vmargslot_name,                            "vmargslot")                                \
+  template(flags_name,                                "flags")                                    \
+  template(argument_name,                             "argument")                                 \
+  template(conversion_name,                           "conversion")                               \
+  template(rtype_name,                                "rtype")                                    \
+  template(ptypes_name,                               "ptypes")                                   \
+  template(form_name,                                 "form")                                     \
+  template(erasedType_name,                           "erasedType")                               \
                                                                                                   \
   /* non-intrinsic name/signature pairs: */                                                       \
   template(register_method_name,                      "register")                                 \
@@ -353,6 +387,7 @@
   template(void_classloader_signature,                "()Ljava/lang/ClassLoader;")                                \
   template(void_object_signature,                     "()Ljava/lang/Object;")                                     \
   template(void_class_signature,                      "()Ljava/lang/Class;")                                      \
+  template(void_string_signature,                     "()Ljava/lang/String;")                                      \
   template(object_array_object_object_signature,      "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;")\
   template(exception_void_signature,                  "(Ljava/lang/Exception;)V")                                 \
   template(protectiondomain_signature,                "[Ljava/security/ProtectionDomain;")                        \
--- a/src/share/vm/includeDB_core	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/includeDB_core	Wed Apr 08 10:56:49 2009 -0700
@@ -254,6 +254,7 @@
 assembler_<arch>.cpp              collectedHeap.inline.hpp
 assembler_<arch>.cpp              interfaceSupport.hpp
 assembler_<arch>.cpp              interpreter.hpp
+assembler_<arch>.cpp              methodHandles.hpp
 assembler_<arch>.cpp              objectMonitor.hpp
 assembler_<arch>.cpp              os.hpp
 assembler_<arch>.cpp              resourceArea.hpp
@@ -1274,6 +1275,7 @@
 cpCacheKlass.cpp                        collectedHeap.hpp
 cpCacheKlass.cpp                        constantPoolOop.hpp
 cpCacheKlass.cpp                        cpCacheKlass.hpp
+cpCacheKlass.cpp                        genOopClosures.inline.hpp
 cpCacheKlass.cpp                        handles.inline.hpp
 cpCacheKlass.cpp                        javaClasses.hpp
 cpCacheKlass.cpp                        markSweep.inline.hpp
@@ -2202,6 +2204,7 @@
 interpreter_<arch_model>.cpp            jvmtiExport.hpp
 interpreter_<arch_model>.cpp            jvmtiThreadState.hpp
 interpreter_<arch_model>.cpp            methodDataOop.hpp
+interpreter_<arch_model>.cpp            methodHandles.hpp
 interpreter_<arch_model>.cpp            methodOop.hpp
 interpreter_<arch_model>.cpp            oop.inline.hpp
 interpreter_<arch_model>.cpp            sharedRuntime.hpp
@@ -2596,6 +2599,7 @@
 linkResolver.cpp                        instanceKlass.hpp
 linkResolver.cpp                        interpreterRuntime.hpp
 linkResolver.cpp                        linkResolver.hpp
+linkResolver.cpp                        methodHandles.hpp
 linkResolver.cpp                        nativeLookup.hpp
 linkResolver.cpp                        objArrayOop.hpp
 linkResolver.cpp                        reflection.hpp
@@ -2812,6 +2816,25 @@
 methodDataOop.hpp                       orderAccess.hpp
 methodDataOop.hpp                       universe.hpp
 
+methodHandles.hpp                       frame.inline.hpp
+methodHandles.hpp                       globals.hpp
+methodHandles.hpp                       interfaceSupport.hpp
+methodHandles.hpp                       javaClasses.hpp
+methodHandles.hpp                       vmSymbols.hpp
+
+methodHandles.cpp                       allocation.inline.hpp
+methodHandles.cpp                       interpreter.hpp
+methodHandles.cpp                       javaCalls.hpp
+methodHandles.cpp                       methodHandles.hpp
+methodHandles.cpp                       oopFactory.hpp
+methodHandles.cpp                       reflection.hpp
+methodHandles.cpp                       signature.hpp
+methodHandles.cpp                       symbolTable.hpp
+
+methodHandles_<arch>.cpp                allocation.inline.hpp
+methodHandles_<arch>.cpp                interpreter.hpp
+methodHandles_<arch>.cpp                methodHandles.hpp
+
 methodKlass.cpp                         collectedHeap.inline.hpp
 methodKlass.cpp                         constMethodKlass.hpp
 methodKlass.cpp                         gcLocker.hpp
@@ -3061,6 +3084,7 @@
 oop.inline.hpp                          arrayOop.hpp
 oop.inline.hpp                          atomic.hpp
 oop.inline.hpp                          barrierSet.inline.hpp
+oop.inline.hpp                          bytes_<arch>.hpp
 oop.inline.hpp                          cardTableModRefBS.hpp
 oop.inline.hpp                          collectedHeap.inline.hpp
 oop.inline.hpp                          compactingPermGenGen.hpp
@@ -3674,6 +3698,7 @@
 sharedRuntime.cpp                       interpreter.hpp
 sharedRuntime.cpp                       javaCalls.hpp
 sharedRuntime.cpp                       jvmtiExport.hpp
+sharedRuntime.cpp                       methodHandles.hpp
 sharedRuntime.cpp                       jvmtiRedefineClassesTrace.hpp
 sharedRuntime.cpp                       nativeInst_<arch>.hpp
 sharedRuntime.cpp                       nativeLookup.hpp
@@ -3862,6 +3887,7 @@
 stubGenerator_<arch_model>.cpp          handles.inline.hpp
 stubGenerator_<arch_model>.cpp          instanceOop.hpp
 stubGenerator_<arch_model>.cpp          interpreter.hpp
+stubGenerator_<arch_model>.cpp          methodHandles.hpp
 stubGenerator_<arch_model>.cpp          methodOop.hpp
 stubGenerator_<arch_model>.cpp          nativeInst_<arch>.hpp
 stubGenerator_<arch_model>.cpp          objArrayKlass.hpp
--- a/src/share/vm/includeDB_gc_parallel	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/includeDB_gc_parallel	Wed Apr 08 10:56:49 2009 -0700
@@ -36,6 +36,12 @@
 constantPoolKlass.cpp                   psScavenge.inline.hpp
 constantPoolKlass.cpp                   parOopClosures.inline.hpp
 
+constantPoolKlass.cpp                   cardTableRS.hpp
+constantPoolKlass.cpp                   oop.pcgc.inline.hpp
+constantPoolKlass.cpp                   psPromotionManager.inline.hpp
+constantPoolKlass.cpp                   psScavenge.inline.hpp
+constantPoolKlass.cpp                   parOopClosures.inline.hpp
+
 genCollectedHeap.cpp                    concurrentMarkSweepThread.hpp
 genCollectedHeap.cpp                    vmCMSOperations.hpp
 
--- a/src/share/vm/interpreter/abstractInterpreter.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/abstractInterpreter.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -61,6 +61,7 @@
     empty,                                                      // empty method (code: _return)
     accessor,                                                   // accessor method (code: _aload_0, _getfield, _(a|i)return)
     abstract,                                                   // abstract method (throws an AbstractMethodException)
+    method_handle,                                              // java.dyn.MethodHandles::invoke
     java_lang_math_sin,                                         // implementation of java.lang.Math.sin   (x)
     java_lang_math_cos,                                         // implementation of java.lang.Math.cos   (x)
     java_lang_math_tan,                                         // implementation of java.lang.Math.tan   (x)
@@ -91,8 +92,6 @@
 
   static address    _rethrow_exception_entry;                   // rethrows an activation in previous frame
 
-
-
   friend class      AbstractInterpreterGenerator;
   friend class              InterpreterGenerator;
   friend class      InterpreterMacroAssembler;
--- a/src/share/vm/interpreter/cppInterpreter.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/cppInterpreter.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -114,6 +114,7 @@
     method_entry(empty);
     method_entry(accessor);
     method_entry(abstract);
+    method_entry(method_handle);
     method_entry(java_lang_math_sin   );
     method_entry(java_lang_math_cos   );
     method_entry(java_lang_math_tan   );
--- a/src/share/vm/interpreter/interpreter.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/interpreter.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -168,10 +168,14 @@
   // Abstract method?
   if (m->is_abstract()) return abstract;
 
+  // Invoker for method handles?
+  if (m->is_method_handle_invoke())  return method_handle;
+
   // Native method?
   // Note: This test must come _before_ the test for intrinsic
   //       methods. See also comments below.
   if (m->is_native()) {
+    assert(!m->is_method_handle_invoke(), "overlapping bits here, watch out");
     return m->is_synchronized() ? native_synchronized : native;
   }
 
@@ -249,6 +253,7 @@
     case empty                  : tty->print("empty"                  ); break;
     case accessor               : tty->print("accessor"               ); break;
     case abstract               : tty->print("abstract"               ); break;
+    case method_handle          : tty->print("method_handle"          ); break;
     case java_lang_math_sin     : tty->print("java_lang_math_sin"     ); break;
     case java_lang_math_cos     : tty->print("java_lang_math_cos"     ); break;
     case java_lang_math_tan     : tty->print("java_lang_math_tan"     ); break;
--- a/src/share/vm/interpreter/interpreterRuntime.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/interpreterRuntime.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -293,6 +293,24 @@
   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
 IRT_END
 
+// required can be either a MethodType, or a Class (for a single argument)
+// actual (if not null) can be either a MethodHandle, or an arbitrary value (for a single argument)
+IRT_ENTRY(void, InterpreterRuntime::throw_WrongMethodTypeException(JavaThread* thread,
+                                                                   oopDesc* required,
+                                                                   oopDesc* actual)) {
+  ResourceMark rm(thread);
+  char* message = SharedRuntime::generate_wrong_method_type_message(thread, required, actual);
+
+  if (ProfileTraps) {
+    note_trap(thread, Deoptimization::Reason_constraint, CHECK);
+  }
+
+  // create exception
+  THROW_MSG(vmSymbols::java_dyn_WrongMethodTypeException(), message);
+}
+IRT_END
+
+
 
 // exception_handler_for_exception(...) returns the continuation address,
 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
--- a/src/share/vm/interpreter/interpreterRuntime.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/interpreterRuntime.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -66,6 +66,7 @@
   static void    throw_StackOverflowError(JavaThread* thread);
   static void    throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index);
   static void    throw_ClassCastException(JavaThread* thread, oopDesc* obj);
+  static void    throw_WrongMethodTypeException(JavaThread* thread, oopDesc* mtype = NULL, oopDesc* mhandle = NULL);
   static void    create_exception(JavaThread* thread, char* name, char* message);
   static void    create_klass_exception(JavaThread* thread, char* name, oopDesc* obj);
   static address exception_handler_for_exception(JavaThread* thread, oopDesc* exception);
--- a/src/share/vm/interpreter/linkResolver.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/linkResolver.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -151,6 +151,20 @@
   result = methodHandle(THREAD, ik->lookup_method_in_all_interfaces(name(), signature()));
 }
 
+void LinkResolver::lookup_implicit_method(methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
+  if (EnableMethodHandles && MethodHandles::enabled() &&
+      name == vmSymbolHandles::invoke_name() && klass() == SystemDictionary::MethodHandle_klass()) {
+    methodOop result_oop = SystemDictionary::find_method_handle_invoke(signature,
+                                                                       Handle(),
+                                                                       Handle(),
+                                                                       CHECK);
+    if (result_oop != NULL) {
+      assert(result_oop->is_method_handle_invoke() && result_oop->signature() == signature(), "consistent");
+      result = methodHandle(THREAD, result_oop);
+    }
+  }
+}
+
 void LinkResolver::check_method_accessability(KlassHandle ref_klass,
                                               KlassHandle resolved_klass,
                                               KlassHandle sel_klass,
@@ -240,6 +254,11 @@
     lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
 
     if (resolved_method.is_null()) {
+      // JSR 292:  see if this is an implicitly generated method MethodHandle.invoke(*...)
+      lookup_implicit_method(resolved_method, resolved_klass, method_name, method_signature, CHECK);
+    }
+
+    if (resolved_method.is_null()) {
       // 4. method lookup failed
       ResourceMark rm(THREAD);
       THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(),
--- a/src/share/vm/interpreter/linkResolver.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/linkResolver.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -103,6 +103,7 @@
   static void lookup_method_in_klasses          (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
   static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
   static void lookup_method_in_interfaces       (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
+  static void lookup_implicit_method            (methodHandle& result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
 
   static int vtable_index_of_miranda_method(KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS);
 
--- a/src/share/vm/interpreter/templateInterpreter.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/templateInterpreter.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -168,6 +168,7 @@
 address    TemplateInterpreter::_throw_ArrayStoreException_entry            = NULL;
 address    TemplateInterpreter::_throw_ArithmeticException_entry            = NULL;
 address    TemplateInterpreter::_throw_ClassCastException_entry             = NULL;
+address    TemplateInterpreter::_throw_WrongMethodType_entry                = NULL;
 address    TemplateInterpreter::_throw_NullPointerException_entry           = NULL;
 address    TemplateInterpreter::_throw_StackOverflowError_entry             = NULL;
 address    TemplateInterpreter::_throw_exception_entry                      = NULL;
@@ -341,6 +342,7 @@
     Interpreter::_throw_ArrayStoreException_entry            = generate_klass_exception_handler("java/lang/ArrayStoreException"                 );
     Interpreter::_throw_ArithmeticException_entry            = generate_exception_handler("java/lang/ArithmeticException"           , "/ by zero");
     Interpreter::_throw_ClassCastException_entry             = generate_ClassCastException_handler();
+    Interpreter::_throw_WrongMethodType_entry                = generate_WrongMethodType_handler();
     Interpreter::_throw_NullPointerException_entry           = generate_exception_handler("java/lang/NullPointerException"          , NULL       );
     Interpreter::_throw_StackOverflowError_entry             = generate_StackOverflowError_handler();
   }
@@ -358,6 +360,7 @@
   method_entry(empty)
   method_entry(accessor)
   method_entry(abstract)
+  method_entry(method_handle)
   method_entry(java_lang_math_sin  )
   method_entry(java_lang_math_cos  )
   method_entry(java_lang_math_tan  )
--- a/src/share/vm/interpreter/templateInterpreter.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/templateInterpreter.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -77,6 +77,7 @@
   friend class VMStructs;
   friend class InterpreterMacroAssembler;
   friend class TemplateInterpreterGenerator;
+  friend class InterpreterGenerator;
   friend class TemplateTable;
   // friend class Interpreter;
  public:
@@ -93,6 +94,7 @@
   static address    _throw_ArrayStoreException_entry;
   static address    _throw_ArithmeticException_entry;
   static address    _throw_ClassCastException_entry;
+  static address    _throw_WrongMethodType_entry;
   static address    _throw_NullPointerException_entry;
   static address    _throw_exception_entry;
 
@@ -137,6 +139,7 @@
   static address    remove_activation_entry()                   { return _remove_activation_entry; }
   static address    throw_exception_entry()                     { return _throw_exception_entry; }
   static address    throw_ArithmeticException_entry()           { return _throw_ArithmeticException_entry; }
+  static address    throw_WrongMethodType_entry()               { return _throw_WrongMethodType_entry; }
   static address    throw_NullPointerException_entry()          { return _throw_NullPointerException_entry; }
   static address    throw_StackOverflowError_entry()            { return _throw_StackOverflowError_entry; }
 
--- a/src/share/vm/interpreter/templateInterpreterGenerator.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/interpreter/templateInterpreterGenerator.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -48,6 +48,7 @@
   }
   address generate_exception_handler_common(const char* name, const char* message, bool pass_oop);
   address generate_ClassCastException_handler();
+  address generate_WrongMethodType_handler();
   address generate_ArrayIndexOutOfBounds_handler(const char* name);
   address generate_continuation_for(TosState state);
   address generate_return_entry_for(TosState state, int step);
--- a/src/share/vm/memory/dump.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/memory/dump.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2009 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
@@ -928,6 +928,9 @@
     // shared classes at runtime, where constraints were previously created.
     guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
               "loader constraints are not saved");
+    // Revisit and implement this if we prelink method handle call sites:
+    guarantee(SystemDictionary::invoke_method_table()->number_of_entries() == 0,
+              "invoke method table is not saved");
     GenCollectedHeap* gch = GenCollectedHeap::heap();
 
     // At this point, many classes have been loaded.
--- a/src/share/vm/oops/methodKlass.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/oops/methodKlass.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -298,7 +298,11 @@
     m->code()->print_value_on(st);
     st->cr();
   }
-  if (m->is_native()) {
+  if (m->is_method_handle_invoke()) {
+    st->print_cr(" - invoke method type: " INTPTR_FORMAT, (address) m->method_handle_type());
+    // m is classified as native, but it does not have an interesting
+    // native_function or signature handler
+  } else if (m->is_native()) {
     st->print_cr(" - native function:   " INTPTR_FORMAT, m->native_function());
     st->print_cr(" - signature handler: " INTPTR_FORMAT, m->signature_handler());
   }
--- a/src/share/vm/oops/methodOop.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/oops/methodOop.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -304,6 +304,12 @@
 }
 
 
+int methodOopDesc::extra_stack_words() {
+  // not an inline function, to avoid a header dependency on Interpreter
+  return extra_stack_entries() * Interpreter::stackElementSize();
+}
+
+
 void methodOopDesc::compute_size_of_parameters(Thread *thread) {
   symbolHandle h_signature(thread, signature());
   ArgumentSizeComputer asc(h_signature);
@@ -564,6 +570,11 @@
 
 
 bool methodOopDesc::is_not_compilable(int comp_level) const {
+  if (is_method_handle_invoke()) {
+    // compilers must recognize this method specially, or not at all
+    return true;
+  }
+
   methodDataOop mdo = method_data();
   if (mdo != NULL
       && (uint)mdo->decompile_count() > (uint)PerMethodRecompilationCutoff) {
@@ -651,7 +662,7 @@
   assert(entry != NULL, "interpreter entry must be non-null");
   // Sets both _i2i_entry and _from_interpreted_entry
   set_interpreter_entry(entry);
-  if (is_native()) {
+  if (is_native() && !is_method_handle_invoke()) {
     set_native_function(
       SharedRuntime::native_method_throw_unsatisfied_link_error_entry(),
       !native_bind_event_is_interesting);
@@ -783,6 +794,100 @@
   return false;
 }
 
+// Constant pool structure for invoke methods:
+enum {
+  _imcp_invoke_name = 1,        // utf8: 'invoke'
+  _imcp_invoke_signature,       // utf8: (variable symbolOop)
+  _imcp_method_type_value,      // string: (variable java/dyn/MethodType, sic)
+  _imcp_limit
+};
+
+oop methodOopDesc::method_handle_type() const {
+  if (!is_method_handle_invoke()) { assert(false, "caller resp."); return NULL; }
+  oop mt = constants()->resolved_string_at(_imcp_method_type_value);
+  assert(mt->klass() == SystemDictionary::MethodType_klass(), "");
+  return mt;
+}
+
+jint* methodOopDesc::method_type_offsets_chain() {
+  static jint pchase[] = { -1, -1, -1 };
+  if (pchase[0] == -1) {
+    jint step0 = in_bytes(constants_offset());
+    jint step1 = (constantPoolOopDesc::header_size() + _imcp_method_type_value) * HeapWordSize;
+    // do this in reverse to avoid races:
+    OrderAccess::release_store(&pchase[1], step1);
+    OrderAccess::release_store(&pchase[0], step0);
+  }
+  return pchase;
+}
+
+methodHandle methodOopDesc::make_invoke_method(KlassHandle holder,
+                                               symbolHandle signature,
+                                               Handle method_type, TRAPS) {
+  methodHandle empty;
+
+  assert(holder() == SystemDictionary::MethodHandle_klass(),
+         "must be a JSR 292 magic type");
+
+  if (TraceMethodHandles) {
+    tty->print("Creating invoke method for ");
+    signature->print_value();
+    tty->cr();
+  }
+
+  constantPoolHandle cp;
+  {
+    constantPoolOop cp_oop = oopFactory::new_constantPool(_imcp_limit, IsSafeConc, CHECK_(empty));
+    cp = constantPoolHandle(THREAD, cp_oop);
+  }
+  cp->symbol_at_put(_imcp_invoke_name,       vmSymbols::invoke_name());
+  cp->symbol_at_put(_imcp_invoke_signature,  signature());
+  cp->string_at_put(_imcp_method_type_value, vmSymbols::void_signature());
+  cp->set_pool_holder(holder());
+
+  // set up the fancy stuff:
+  cp->pseudo_string_at_put(_imcp_method_type_value, method_type());
+  methodHandle m;
+  {
+    int flags_bits = (JVM_MH_INVOKE_BITS | JVM_ACC_PUBLIC | JVM_ACC_FINAL);
+    methodOop m_oop = oopFactory::new_method(0, accessFlags_from(flags_bits),
+                                             0, 0, 0, IsSafeConc, CHECK_(empty));
+    m = methodHandle(THREAD, m_oop);
+  }
+  m->set_constants(cp());
+  m->set_name_index(_imcp_invoke_name);
+  m->set_signature_index(_imcp_invoke_signature);
+  assert(m->name() == vmSymbols::invoke_name(), "");
+  assert(m->signature() == signature(), "");
+#ifdef CC_INTERP
+  ResultTypeFinder rtf(signature());
+  m->set_result_index(rtf.type());
+#endif
+  m->compute_size_of_parameters(THREAD);
+  m->set_exception_table(Universe::the_empty_int_array());
+
+  // Finally, set up its entry points.
+  assert(m->method_handle_type() == method_type(), "");
+  assert(m->can_be_statically_bound(), "");
+  m->set_vtable_index(methodOopDesc::nonvirtual_vtable_index);
+  m->link_method(m, CHECK_(empty));
+
+#ifdef ASSERT
+  // Make sure the pointer chase works.
+  address p = (address) m();
+  for (jint* pchase = method_type_offsets_chain(); (*pchase) != -1; pchase++) {
+    p = *(address*)(p + (*pchase));
+  }
+  assert((oop)p == method_type(), "pointer chase is correct");
+#endif
+
+  if (TraceMethodHandles)
+    m->print_on(tty);
+
+  return m;
+}
+
+
 
 methodHandle methodOopDesc:: clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
                                                 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) {
--- a/src/share/vm/oops/methodOop.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/oops/methodOop.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -320,6 +320,7 @@
   enum VtableIndexFlag {
     // Valid vtable indexes are non-negative (>= 0).
     // These few negative values are used as sentinels.
+    highest_unused_vtable_index_value = -5,
     invalid_vtable_index    = -4,  // distinct from any valid vtable index
     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
@@ -523,6 +524,18 @@
   // Reflection support
   bool is_overridden_in(klassOop k) const;
 
+  // JSR 292 support
+  bool is_method_handle_invoke() const              { return access_flags().is_method_handle_invoke(); }
+  static methodHandle make_invoke_method(KlassHandle holder,
+                                         symbolHandle signature,
+                                         Handle method_type,
+                                         TRAPS);
+  // these operate only on invoke methods:
+  oop method_handle_type() const;
+  static jint* method_type_offsets_chain();  // series of pointer-offsets, terminated by -1
+  // presize interpreter frames for extra interpreter stack entries, if needed
+  static int extra_stack_entries() { return EnableMethodHandles ? (int)MethodHandlePushLimit : 0; }
+  static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize()
   // RedefineClasses() support:
   bool is_old() const                               { return access_flags().is_old(); }
   void set_is_old()                                 { _access_flags.set_is_old(); }
--- a/src/share/vm/oops/oop.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/oops/oop.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -263,6 +263,9 @@
   jdouble double_field_acquire(int offset) const;
   void release_double_field_put(int offset, jdouble contents);
 
+  address address_field_acquire(int offset) const;
+  void release_address_field_put(int offset, address contents);
+
   // printing functions for VM debugging
   void print_on(outputStream* st) const;         // First level print
   void print_value_on(outputStream* st) const;   // Second level print.
--- a/src/share/vm/oops/oop.inline.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/oops/oop.inline.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -349,6 +349,9 @@
 inline jdouble oopDesc::double_field_acquire(int offset) const              { return OrderAccess::load_acquire(double_field_addr(offset));     }
 inline void oopDesc::release_double_field_put(int offset, jdouble contents) { OrderAccess::release_store(double_field_addr(offset), contents); }
 
+inline address oopDesc::address_field_acquire(int offset) const             { return (address) OrderAccess::load_ptr_acquire(address_field_addr(offset)); }
+inline void oopDesc::release_address_field_put(int offset, address contents) { OrderAccess::release_store_ptr(address_field_addr(offset), contents); }
+
 inline int oopDesc::size_given_klass(Klass* klass)  {
   int lh = klass->layout_helper();
   int s  = lh >> LogHeapWordSize;  // deliver size scaled by wordSize
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/prims/methodHandles.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -0,0 +1,2347 @@
+/*
+ * Copyright 2008-2009 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.
+ *
+ */
+
+/*
+ * JSR 292 reference implementation: method handles
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_methodHandles.cpp.incl"
+
+bool MethodHandles::_enabled = false; // set true after successful native linkage
+
+MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL};
+const char*        MethodHandles::_entry_names[_EK_LIMIT+1] = {
+  "check_mtype",
+  "wrong_method_type",          // what happens when there is a type mismatch
+  "invokestatic",               // how a MH emulates invokestatic
+  "invokespecial",              // ditto for the other invokes...
+  "invokevirtual",
+  "invokeinterface",
+  "bound_ref",                  // these are for BMH...
+  "bound_int",
+  "bound_long",
+  "bound_ref_direct",           // (direct versions have a direct methodOop)
+  "bound_int_direct",
+  "bound_long_direct",
+
+  // starting at _adapter_mh_first:
+  "adapter_retype_only",       // these are for AMH...
+  "adapter_check_cast",
+  "adapter_prim_to_prim",
+  "adapter_ref_to_prim",
+  "adapter_prim_to_ref",
+  "adapter_swap_args",
+  "adapter_rot_args",
+  "adapter_dup_args",
+  "adapter_drop_args",
+  "adapter_collect_args",
+  "adapter_spread_args",
+  "adapter_flyby",
+  "adapter_ricochet",
+
+  // optimized adapter types:
+  "adapter_swap_args/1",
+  "adapter_swap_args/2",
+  "adapter_rot_args/1,up",
+  "adapter_rot_args/1,down",
+  "adapter_rot_args/2,up",
+  "adapter_rot_args/2,down",
+  "adapter_prim_to_prim/i2i",
+  "adapter_prim_to_prim/l2i",
+  "adapter_prim_to_prim/d2f",
+  "adapter_prim_to_prim/i2l",
+  "adapter_prim_to_prim/f2d",
+  "adapter_ref_to_prim/unboxi",
+  "adapter_ref_to_prim/unboxl",
+  "adapter_spread_args/0",
+  "adapter_spread_args/1",
+  "adapter_spread_args/more",
+
+  NULL
+};
+
+#ifdef ASSERT
+bool MethodHandles::spot_check_entry_names() {
+  assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), "");
+  assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), "");
+  assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), "");
+  assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), "");
+  assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), "");
+  return true;
+}
+#endif
+
+void MethodHandles::set_enabled(bool z) {
+  if (_enabled != z) {
+    guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles");
+    _enabled = z;
+  }
+}
+
+// Note: A method which does not have a TRAPS argument cannot block in the GC
+// or throw exceptions.  Such methods are used in this file to do something quick
+// and local, like parse a data structure.  For speed, such methods work on plain
+// oops, not handles.  Trapping methods uniformly operate on handles.
+
+methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype,
+                                         klassOop& receiver_limit_result, int& decode_flags_result) {
+  if (vmtarget == NULL)  return NULL;
+  assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding");
+  if (vmindex < 0) {
+    // this DMH performs no dispatch; it is directly bound to a methodOop
+    // A MemberName may either be directly bound to a methodOop,
+    // or it may use the klass/index form; both forms mean the same thing.
+    methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result);
+    if ((decode_flags_result & _dmf_has_receiver) != 0
+        && java_dyn_MethodType::is_instance(mtype)) {
+      // Extract receiver type restriction from mtype.ptypes[0].
+      objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype);
+      oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0);
+      if (java_lang_Class::is_instance(ptype0))
+        receiver_limit_result = java_lang_Class::as_klassOop(ptype0);
+    }
+    if (vmindex == methodOopDesc::nonvirtual_vtable_index) {
+      // this DMH can be an "invokespecial" version
+      decode_flags_result &= ~_dmf_does_dispatch;
+    } else {
+      assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?");
+    }
+    return m;
+  } else {
+    decode_flags_result |= MethodHandles::_dmf_does_dispatch;
+    assert(vmtarget->is_klass(), "must be class or interface");
+    receiver_limit_result = (klassOop)vmtarget;
+    Klass* tk = Klass::cast((klassOop)vmtarget);
+    if (tk->is_interface()) {
+      // an itable linkage is <interface, itable index>
+      decode_flags_result |= MethodHandles::_dmf_from_interface;
+      return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex);
+    } else {
+      if (!tk->oop_is_instance())
+        tk = instanceKlass::cast(SystemDictionary::object_klass());
+      return ((instanceKlass*)tk)->method_at_vtable(vmindex);
+    }
+  }
+}
+
+// MemberName and DirectMethodHandle have the same linkage to the JVM internals.
+// (MemberName is the non-operational name used for queries and setup.)
+
+methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
+  oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh);
+  int vmindex  = sun_dyn_DirectMethodHandle::vmindex(mh);
+  oop mtype    = sun_dyn_DirectMethodHandle::type(mh);
+  return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result);
+}
+
+methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
+  assert(mh->klass() == SystemDictionary::BoundMethodHandle_klass(), "");
+  for (oop bmh = mh;;) {
+    // Bound MHs can be stacked to bind several arguments.
+    oop target = java_dyn_MethodHandle::vmtarget(bmh);
+    if (target == NULL)  return NULL;
+    decode_flags_result |= MethodHandles::_dmf_binds_argument;
+    klassOop tk = target->klass();
+    if (tk == SystemDictionary::BoundMethodHandle_klass()) {
+      bmh = target;
+      continue;
+    } else {
+      if (java_dyn_MethodHandle::is_subclass(tk)) {
+        //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH");
+        return decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
+      } else {
+        // Optimized case:  binding a receiver to a non-dispatched DMH
+        // short-circuits directly to the methodOop.
+        assert(target->is_method(), "must be a simple method");
+        methodOop m = (methodOop) target;
+        DEBUG_ONLY(int argslot = sun_dyn_BoundMethodHandle::vmargslot(bmh));
+        assert(argslot == m->size_of_parameters() - 1, "must be initial argument (receiver)");
+        decode_flags_result |= MethodHandles::_dmf_binds_method;
+        return m;
+      }
+    }
+  }
+}
+
+methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
+  assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), "");
+  for (oop amh = mh;;) {
+    // Adapter MHs can be stacked to convert several arguments.
+    int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh));
+    decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK;
+    oop target = java_dyn_MethodHandle::vmtarget(amh);
+    if (target == NULL)  return NULL;
+    klassOop tk = target->klass();
+    if (tk == SystemDictionary::AdapterMethodHandle_klass()) {
+      amh = target;
+      continue;
+    } else {
+      // must be a BMH (which will bind some more arguments) or a DMH (for the final call)
+      return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result);
+    }
+  }
+}
+
+methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) {
+  if (mh == NULL)  return NULL;
+  klassOop mhk = mh->klass();
+  assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle");
+  if (mhk == SystemDictionary::DirectMethodHandle_klass()) {
+    return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result);
+  } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) {
+    return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result);
+  } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) {
+    return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result);
+  } else {
+    assert(false, "cannot parse this MH");
+    return NULL;              // random MH?
+  }
+}
+
+methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) {
+  assert(m->is_method(), "");
+  if (m->is_static()) {
+    // check that signature begins '(L' or '([' (not '(I', '()', etc.)
+    symbolOop sig = m->signature();
+    BasicType recv_bt = char2type(sig->byte_at(1));
+    // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')'
+    assert(sig->byte_at(0) == '(', "must be method sig");
+    if (recv_bt == T_OBJECT || recv_bt == T_ARRAY)
+      decode_flags_result |= _dmf_has_receiver;
+  } else {
+    // non-static method
+    decode_flags_result |= _dmf_has_receiver;
+    if (!m->can_be_statically_bound() && !m->is_initializer()) {
+      decode_flags_result |= _dmf_does_dispatch;
+      if (Klass::cast(m->method_holder())->is_interface())
+        decode_flags_result |= _dmf_from_interface;
+    }
+  }
+  return m;
+}
+
+
+// A trusted party is handing us a cookie to determine a method.
+// Let's boil it down to the method oop they really want.
+methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) {
+  decode_flags_result = 0;
+  receiver_limit_result = NULL;
+  klassOop xk = x->klass();
+  if (xk == Universe::methodKlassObj()) {
+    return decode_methodOop((methodOop) x, decode_flags_result);
+  } else if (xk == SystemDictionary::MemberName_klass()) {
+    // Note: This only works if the MemberName has already been resolved.
+    return decode_MemberName(x, receiver_limit_result, decode_flags_result);
+  } else if (java_dyn_MethodHandle::is_subclass(xk)) {
+    return decode_MethodHandle(x, receiver_limit_result, decode_flags_result);
+  } else if (xk == SystemDictionary::reflect_method_klass()) {
+    oop clazz  = java_lang_reflect_Method::clazz(x);
+    int slot   = java_lang_reflect_Method::slot(x);
+    klassOop k = java_lang_Class::as_klassOop(clazz);
+    if (k != NULL && Klass::cast(k)->oop_is_instance())
+      return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
+                              decode_flags_result);
+  } else if (xk == SystemDictionary::reflect_constructor_klass()) {
+    oop clazz  = java_lang_reflect_Constructor::clazz(x);
+    int slot   = java_lang_reflect_Constructor::slot(x);
+    klassOop k = java_lang_Class::as_klassOop(clazz);
+    if (k != NULL && Klass::cast(k)->oop_is_instance())
+      return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot),
+                              decode_flags_result);
+  } else {
+    // unrecognized object
+    assert(!x->is_method(), "already checked");
+    assert(!sun_dyn_MemberName::is_instance(x), "already checked");
+  }
+  return NULL;
+}
+
+
+int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) {
+  if (mh->klass() == SystemDictionary::DirectMethodHandle_klass())
+    return 0;                   // no push/pop
+  int this_vmslots = java_dyn_MethodHandle::vmslots(mh);
+  int last_vmslots = 0;
+  oop last_mh = mh;
+  for (;;) {
+    oop target = java_dyn_MethodHandle::vmtarget(last_mh);
+    if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
+      last_vmslots = java_dyn_MethodHandle::vmslots(target);
+      break;
+    } else if (!java_dyn_MethodHandle::is_instance(target)) {
+      // might be klass or method
+      assert(target->is_method(), "must get here with a direct ref to method");
+      last_vmslots = methodOop(target)->size_of_parameters();
+      break;
+    }
+    last_mh = target;
+  }
+  // If I am called with fewer VM slots than my ultimate callee,
+  // it must be that I push the additionally needed slots.
+  // Likewise if am called with more VM slots, I will pop them.
+  return (last_vmslots - this_vmslots);
+}
+
+
+// MemberName support
+
+// import sun_dyn_MemberName.*
+enum {
+  IS_METHOD      = sun_dyn_MemberName::MN_IS_METHOD,
+  IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR,
+  IS_FIELD       = sun_dyn_MemberName::MN_IS_FIELD,
+  IS_TYPE        = sun_dyn_MemberName::MN_IS_TYPE,
+  SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES,
+  SEARCH_INTERFACES   = sun_dyn_MemberName::MN_SEARCH_INTERFACES,
+  ALL_KINDS      = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE,
+  VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED
+};
+
+void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) {
+  if (target_oop->klass() == SystemDictionary::reflect_field_klass()) {
+    oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
+    int slot  = java_lang_reflect_Field::slot(target_oop);  // fd.index()
+    int mods  = java_lang_reflect_Field::modifiers(target_oop);
+    klassOop k = java_lang_Class::as_klassOop(clazz);
+    int offset = instanceKlass::cast(k)->offset_from_fields(slot);
+    init_MemberName(mname_oop, k, accessFlags_from(mods), offset);
+  } else {
+    int decode_flags = 0; klassOop receiver_limit = NULL;
+    methodOop m = MethodHandles::decode_method(target_oop,
+                                               receiver_limit, decode_flags);
+    bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
+    init_MemberName(mname_oop, m, do_dispatch);
+  }
+}
+
+void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) {
+  int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD)
+               | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ));
+  oop vmtarget = m;
+  int vmindex  = methodOopDesc::invalid_vtable_index;  // implies no info yet
+  if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound())
+    vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch
+  assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value");
+  sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
+  sun_dyn_MemberName::set_vmindex(mname_oop,  vmindex);
+  sun_dyn_MemberName::set_flags(mname_oop,    flags);
+}
+
+void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) {
+  int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ));
+  oop vmtarget = field_holder;
+  int vmindex  = offset;  // implies no info yet
+  assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex");
+  sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget);
+  sun_dyn_MemberName::set_vmindex(mname_oop,  vmindex);
+  sun_dyn_MemberName::set_flags(mname_oop,    flags);
+}
+
+
+methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) {
+  int flags  = sun_dyn_MemberName::flags(mname);
+  if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0)  return NULL;  // not invocable
+  oop vmtarget = sun_dyn_MemberName::vmtarget(mname);
+  int vmindex  = sun_dyn_MemberName::vmindex(mname);
+  if (vmindex == VM_INDEX_UNINITIALIZED)  return NULL; // not resolved
+  return decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result);
+}
+
+// An unresolved member name is a mere symbolic reference.
+// Resolving it plants a vmtarget/vmindex in it,
+// which refers dirctly to JVM internals.
+void MethodHandles::resolve_MemberName(Handle mname, TRAPS) {
+  assert(sun_dyn_MemberName::is_instance(mname()), "");
+#ifdef ASSERT
+  // If this assert throws, renegotiate the sentinel value used by the Java code,
+  // so that it is distinct from any valid vtable index value, and any special
+  // values defined in methodOopDesc::VtableIndexFlag.
+  // The point of the slop is to give the Java code and the JVM some room
+  // to independently specify sentinel values.
+  const int sentinel_slop  = 10;
+  const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop;
+  assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels");
+#endif
+  if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED)
+    return;  // already resolved
+  oop defc_oop = sun_dyn_MemberName::clazz(mname());
+  oop name_str = sun_dyn_MemberName::name(mname());
+  oop type_str = sun_dyn_MemberName::type(mname());
+  int flags    = sun_dyn_MemberName::flags(mname());
+
+  if (defc_oop == NULL || name_str == NULL || type_str == NULL) {
+    THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve");
+  }
+  klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop);
+  defc_oop = NULL;  // safety
+  if (defc_klassOop == NULL)  return;  // a primitive; no resolution possible
+  if (!Klass::cast(defc_klassOop)->oop_is_instance()) {
+    if (!Klass::cast(defc_klassOop)->oop_is_array())  return;
+    defc_klassOop = SystemDictionary::object_klass();
+  }
+  instanceKlassHandle defc(THREAD, defc_klassOop);
+  defc_klassOop = NULL;  // safety
+  if (defc.is_null()) {
+    THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class");
+  }
+  defc->link_class(CHECK);
+
+  // convert the external string name to an internal symbol
+  symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str));
+  if (name.is_null())  return;  // no such name
+  name_str = NULL;  // safety
+
+  // convert the external string or reflective type to an internal signature
+  bool force_signature = (name() == vmSymbols::invoke_name());
+  symbolHandle type; {
+    symbolOop type_sym = NULL;
+    if (java_dyn_MethodType::is_instance(type_str)) {
+      type_sym = java_dyn_MethodType::as_signature(type_str, force_signature, CHECK);
+    } else if (java_lang_Class::is_instance(type_str)) {
+      type_sym = java_lang_Class::as_signature(type_str, force_signature, CHECK);
+    } else if (java_lang_String::is_instance(type_str)) {
+      if (force_signature) {
+        type     = java_lang_String::as_symbol(type_str, CHECK);
+      } else {
+        type_sym = java_lang_String::as_symbol_or_null(type_str);
+      }
+    } else {
+      THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type");
+    }
+    if (type_sym != NULL)
+      type = symbolHandle(THREAD, type_sym);
+  }
+  if (type.is_null())  return;  // no such signature exists in the VM
+  type_str = NULL; // safety
+
+  // Time to do the lookup.
+  switch (flags & ALL_KINDS) {
+  case IS_METHOD:
+    {
+      CallInfo result;
+      {
+        EXCEPTION_MARK;
+        if ((flags & JVM_ACC_STATIC) != 0) {
+          LinkResolver::resolve_static_call(result,
+                        defc, name, type, KlassHandle(), false, false, THREAD);
+        } else if (defc->is_interface()) {
+          LinkResolver::resolve_interface_call(result, Handle(), defc,
+                        defc, name, type, KlassHandle(), false, false, THREAD);
+        } else {
+          LinkResolver::resolve_virtual_call(result, Handle(), defc,
+                        defc, name, type, KlassHandle(), false, false, THREAD);
+        }
+        if (HAS_PENDING_EXCEPTION) {
+          CLEAR_PENDING_EXCEPTION;
+          return;
+        }
+      }
+      methodHandle m = result.resolved_method();
+      oop vmtarget = NULL;
+      int vmindex = methodOopDesc::nonvirtual_vtable_index;
+      if (defc->is_interface()) {
+        vmindex = klassItable::compute_itable_index(m());
+        assert(vmindex >= 0, "");
+      } else if (result.has_vtable_index()) {
+        vmindex = result.vtable_index();
+        assert(vmindex >= 0, "");
+      }
+      assert(vmindex != VM_INDEX_UNINITIALIZED, "");
+      if (vmindex < 0) {
+        assert(result.is_statically_bound(), "");
+        vmtarget = m();
+      } else {
+        vmtarget = result.resolved_klass()->as_klassOop();
+      }
+      int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
+      sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
+      sun_dyn_MemberName::set_vmindex(mname(),  vmindex);
+      sun_dyn_MemberName::set_modifiers(mname(), mods);
+      DEBUG_ONLY(int junk; klassOop junk2);
+      assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
+             "properly stored for later decoding");
+      return;
+    }
+  case IS_CONSTRUCTOR:
+    {
+      CallInfo result;
+      {
+        EXCEPTION_MARK;
+        if (name() == vmSymbols::object_initializer_name()) {
+          LinkResolver::resolve_special_call(result,
+                        defc, name, type, KlassHandle(), false, THREAD);
+        } else {
+          break;                // will throw after end of switch
+        }
+        if (HAS_PENDING_EXCEPTION) {
+          CLEAR_PENDING_EXCEPTION;
+          return;
+        }
+      }
+      assert(result.is_statically_bound(), "");
+      methodHandle m = result.resolved_method();
+      oop vmtarget = m();
+      int vmindex  = methodOopDesc::nonvirtual_vtable_index;
+      int mods     = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS);
+      sun_dyn_MemberName::set_vmtarget(mname(), vmtarget);
+      sun_dyn_MemberName::set_vmindex(mname(),  vmindex);
+      sun_dyn_MemberName::set_modifiers(mname(), mods);
+      DEBUG_ONLY(int junk; klassOop junk2);
+      assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(),
+             "properly stored for later decoding");
+      return;
+    }
+  case IS_FIELD:
+    {
+      // This is taken from LinkResolver::resolve_field, sans access checks.
+      fieldDescriptor fd; // find_field initializes fd if found
+      KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd));
+      // check if field exists; i.e., if a klass containing the field def has been selected
+      if (sel_klass.is_null())  return;
+      oop vmtarget = sel_klass->as_klassOop();
+      int vmindex  = fd.offset();
+      int mods     = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS);
+      if (vmindex == VM_INDEX_UNINITIALIZED)  break;  // should not happen
+      sun_dyn_MemberName::set_vmtarget(mname(),  vmtarget);
+      sun_dyn_MemberName::set_vmindex(mname(),   vmindex);
+      sun_dyn_MemberName::set_modifiers(mname(), mods);
+      return;
+    }
+  }
+  THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
+}
+
+// Conversely, a member name which is only initialized from JVM internals
+// may have null defc, name, and type fields.
+// Resolving it plants a vmtarget/vmindex in it,
+// which refers directly to JVM internals.
+void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
+  assert(sun_dyn_MemberName::is_instance(mname()), "");
+  oop vmtarget = sun_dyn_MemberName::vmtarget(mname());
+  int vmindex  = sun_dyn_MemberName::vmindex(mname());
+  if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) {
+    THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
+  }
+
+  bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL);
+  bool have_name = (sun_dyn_MemberName::name(mname()) != NULL);
+  bool have_type = (sun_dyn_MemberName::type(mname()) != NULL);
+  int flags      = sun_dyn_MemberName::flags(mname());
+
+  if (suppress != 0) {
+    if (suppress & _suppress_defc)  have_defc = true;
+    if (suppress & _suppress_name)  have_name = true;
+    if (suppress & _suppress_type)  have_type = true;
+  }
+
+  if (have_defc && have_name && have_type)  return;  // nothing needed
+
+  switch (flags & ALL_KINDS) {
+  case IS_METHOD:
+  case IS_CONSTRUCTOR:
+    {
+      klassOop receiver_limit = NULL;
+      int      decode_flags   = 0;
+      methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL,
+                                             receiver_limit, decode_flags));
+      if (m.is_null())  break;
+      if (!have_defc) {
+        klassOop defc = m->method_holder();
+        if (receiver_limit != NULL && receiver_limit != defc
+            && Klass::cast(receiver_limit)->is_subtype_of(defc))
+          defc = receiver_limit;
+        sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror());
+      }
+      if (!have_name) {
+        //not java_lang_String::create_from_symbol; let's intern member names
+        Handle name = StringTable::intern(m->name(), CHECK);
+        sun_dyn_MemberName::set_name(mname(), name());
+      }
+      if (!have_type) {
+        Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
+        sun_dyn_MemberName::set_type(mname(), type());
+      }
+      return;
+    }
+  case IS_FIELD:
+    {
+      // This is taken from LinkResolver::resolve_field, sans access checks.
+      if (!vmtarget->is_klass())  break;
+      if (!Klass::cast((klassOop) vmtarget)->oop_is_instance())  break;
+      instanceKlassHandle defc(THREAD, (klassOop) vmtarget);
+      bool is_static = ((flags & JVM_ACC_STATIC) != 0);
+      fieldDescriptor fd; // find_field initializes fd if found
+      if (!defc->find_field_from_offset(vmindex, is_static, &fd))
+        break;                  // cannot expand
+      if (!have_defc) {
+        sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror());
+      }
+      if (!have_name) {
+        //not java_lang_String::create_from_symbol; let's intern member names
+        Handle name = StringTable::intern(fd.name(), CHECK);
+        sun_dyn_MemberName::set_name(mname(), name());
+      }
+      if (!have_type) {
+        Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK);
+        sun_dyn_MemberName::set_type(mname(), type());
+      }
+      return;
+    }
+  }
+  THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
+}
+
+int MethodHandles::find_MemberNames(klassOop k,
+                                    symbolOop name, symbolOop sig,
+                                    int mflags, klassOop caller,
+                                    int skip, objArrayOop results) {
+  DEBUG_ONLY(No_Safepoint_Verifier nsv);
+  // this code contains no safepoints!
+
+  // %%% take caller into account!
+
+  if (k == NULL || !Klass::cast(k)->oop_is_instance())  return -1;
+
+  int rfill = 0, rlimit = results->length(), rskip = skip;
+  // overflow measurement:
+  int overflow = 0, overflow_limit = MAX2(1000, rlimit);
+
+  int match_flags = mflags;
+  bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
+  bool search_intfc  = ((match_flags & SEARCH_INTERFACES)   != 0);
+  bool local_only = !(search_superc | search_intfc);
+  bool classes_only = false;
+
+  if (name != NULL) {
+    if (name->utf8_length() == 0)  return 0; // a match is not possible
+  }
+  if (sig != NULL) {
+    if (sig->utf8_length() == 0)  return 0; // a match is not possible
+    if (sig->byte_at(0) == '(')
+      match_flags &= ~(IS_FIELD | IS_TYPE);
+    else
+      match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
+  }
+
+  if ((match_flags & IS_TYPE) != 0) {
+    // NYI, and Core Reflection works quite well for this query
+  }
+
+  if ((match_flags & IS_FIELD) != 0) {
+    for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
+      if (name != NULL && st.name() != name)
+          continue;
+      if (sig != NULL && st.signature() != sig)
+        continue;
+      // passed the filters
+      if (rskip > 0) {
+        --rskip;
+      } else if (rfill < rlimit) {
+        oop result = results->obj_at(rfill++);
+        if (!sun_dyn_MemberName::is_instance(result))
+          return -99;  // caller bug!
+        MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset());
+      } else if (++overflow >= overflow_limit) {
+        match_flags = 0; break; // got tired of looking at overflow
+      }
+    }
+  }
+
+  if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
+    // watch out for these guys:
+    symbolOop init_name   = vmSymbols::object_initializer_name();
+    symbolOop clinit_name = vmSymbols::class_initializer_name();
+    if (name == clinit_name)  clinit_name = NULL; // hack for exposing <clinit>
+    bool negate_name_test = false;
+    // fix name so that it captures the intention of IS_CONSTRUCTOR
+    if (!(match_flags & IS_METHOD)) {
+      // constructors only
+      if (name == NULL) {
+        name = init_name;
+      } else if (name != init_name) {
+        return 0;               // no constructors of this method name
+      }
+    } else if (!(match_flags & IS_CONSTRUCTOR)) {
+      // methods only
+      if (name == NULL) {
+        name = init_name;
+        negate_name_test = true; // if we see the name, we *omit* the entry
+      } else if (name == init_name) {
+        return 0;               // no methods of this constructor name
+      }
+    } else {
+      // caller will accept either sort; no need to adjust name
+    }
+    for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) {
+      methodOop m = st.method();
+      symbolOop m_name = m->name();
+      if (m_name == clinit_name)
+        continue;
+      if (name != NULL && ((m_name != name) ^ negate_name_test))
+          continue;
+      if (sig != NULL && m->signature() != sig)
+        continue;
+      // passed the filters
+      if (rskip > 0) {
+        --rskip;
+      } else if (rfill < rlimit) {
+        oop result = results->obj_at(rfill++);
+        if (!sun_dyn_MemberName::is_instance(result))
+          return -99;  // caller bug!
+        MethodHandles::init_MemberName(result, m, true);
+      } else if (++overflow >= overflow_limit) {
+        match_flags = 0; break; // got tired of looking at overflow
+      }
+    }
+  }
+
+  // return number of elements we at leasted wanted to initialize
+  return rfill + overflow;
+}
+
+
+
+
+// Decode the vmtarget field of a method handle.
+// Sanitize out methodOops, klassOops, and any other non-Java data.
+// This is for debugging and reflection.
+oop MethodHandles::encode_target(Handle mh, int format, TRAPS) {
+  assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH");
+  if (format == ETF_HANDLE_OR_METHOD_NAME) {
+    oop target = java_dyn_MethodHandle::vmtarget(mh());
+    if (target == NULL) {
+      return NULL;                // unformed MH
+    }
+    klassOop tklass = target->klass();
+    if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::object_klass())) {
+      return target;              // target is another MH (or something else?)
+    }
+  }
+  if (format == ETF_DIRECT_HANDLE) {
+    oop target = mh();
+    for (;;) {
+      if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) {
+        return target;
+      }
+      if (!java_dyn_MethodHandle::is_instance(target)){
+        return NULL;                // unformed MH
+      }
+      target = java_dyn_MethodHandle::vmtarget(target);
+    }
+  }
+  // cases of metadata in MH.vmtarget:
+  // - AMH can have methodOop for static invoke with bound receiver
+  // - DMH can have methodOop for static invoke (on variable receiver)
+  // - DMH can have klassOop for dispatched (non-static) invoke
+  klassOop receiver_limit = NULL;
+  int decode_flags = 0;
+  methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags);
+  if (m == NULL)  return NULL;
+  switch (format) {
+  case ETF_REFLECT_METHOD:
+    // same as jni_ToReflectedMethod:
+    if (m->is_initializer()) {
+      return Reflection::new_constructor(m, THREAD);
+    } else {
+      return Reflection::new_method(m, UseNewReflection, false, THREAD);
+    }
+
+  case ETF_HANDLE_OR_METHOD_NAME:   // method, not handle
+  case ETF_METHOD_NAME:
+    {
+      if (SystemDictionary::MemberName_klass() == NULL)  break;
+      instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass());
+      mname_klass->initialize(CHECK_NULL);
+      Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL);
+      sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED);
+      bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0);
+      init_MemberName(mname(), m, do_dispatch);
+      expand_MemberName(mname, 0, CHECK_NULL);
+      return mname();
+    }
+  }
+
+  // Unknown format code.
+  char msg[50];
+  jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format);
+  THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg);
+}
+
+bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) {
+  if (src == dst || dst == SystemDictionary::object_klass())
+    return false;                               // quickest checks
+  Klass* srck = Klass::cast(src);
+  Klass* dstk = Klass::cast(dst);
+  if (dstk->is_interface()) {
+    // interface receivers can safely be viewed as untyped,
+    // because interface calls always include a dynamic check
+    //dstk = Klass::cast(SystemDictionary::object_klass());
+    return false;
+  }
+  if (srck->is_interface()) {
+    // interface arguments must be viewed as untyped
+    //srck = Klass::cast(SystemDictionary::object_klass());
+    return true;
+  }
+  return !srck->is_subclass_of(dstk->as_klassOop());
+}
+
+static oop object_java_mirror() {
+  return Klass::cast(SystemDictionary::object_klass())->java_mirror();
+}
+
+bool MethodHandles::same_basic_type_for_arguments(BasicType src,
+                                                  BasicType dst,
+                                                  bool for_return) {
+  // return values can always be forgotten:
+  if (for_return && dst == T_VOID)  return true;
+  assert(src != T_VOID && dst != T_VOID, "should not be here");
+  if (src == dst)  return true;
+  if (type2size[src] != type2size[dst])  return false;
+  // allow reinterpretation casts for integral widening
+  if (is_subword_type(src)) { // subwords can fit in int or other subwords
+    if (dst == T_INT)         // any subword fits in an int
+      return true;
+    if (src == T_BOOLEAN)     // boolean fits in any subword
+      return is_subword_type(dst);
+    if (src == T_BYTE && dst == T_SHORT)
+      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;
+  return false;
+}
+
+const char* MethodHandles::check_method_receiver(methodOop m,
+                                                 klassOop passed_recv_type) {
+  assert(!m->is_static(), "caller resp.");
+  if (passed_recv_type == NULL)
+    return "receiver type is primitive";
+  if (class_cast_needed(passed_recv_type, m->method_holder())) {
+    Klass* formal = Klass::cast(m->method_holder());
+    return SharedRuntime::generate_class_cast_message("receiver type",
+                                                      formal->external_name());
+  }
+  return NULL;                  // checks passed
+}
+
+// Verify that m's signature can be called type-safely by a method handle
+// of the given method type 'mtype'.
+// It takes a TRAPS argument because it must perform symbol lookups.
+void MethodHandles::verify_method_signature(methodHandle m,
+                                            Handle mtype,
+                                            int first_ptype_pos,
+                                            KlassHandle insert_ptype,
+                                            TRAPS) {
+  objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype()));
+  int pnum = first_ptype_pos;
+  int pmax = ptypes->length();
+  int mnum = 0;                 // method argument
+  const char* err = NULL;
+  for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
+    oop ptype_oop = NULL;
+    if (ss.at_return_type()) {
+      if (pnum != pmax)
+        { err = "too many arguments"; break; }
+      ptype_oop = java_dyn_MethodType::rtype(mtype());
+    } else {
+      if (pnum >= pmax)
+        { err = "not enough arguments"; break; }
+      if (pnum >= 0)
+        ptype_oop = ptypes->obj_at(pnum);
+      else if (insert_ptype.is_null())
+        ptype_oop = NULL;
+      else
+        ptype_oop = insert_ptype->java_mirror();
+      pnum += 1;
+      mnum += 1;
+    }
+    klassOop  mklass = NULL;
+    BasicType mtype  = ss.type();
+    if (mtype == T_ARRAY)  mtype = T_OBJECT; // fold all refs to T_OBJECT
+    if (mtype == T_OBJECT) {
+      if (ptype_oop == NULL) {
+        // null matches any reference
+        continue;
+      }
+      // If we fail to resolve types at this point, we will throw an error.
+      symbolOop    name_oop = ss.as_symbol(CHECK);
+      symbolHandle name(THREAD, name_oop);
+      instanceKlass* mk = instanceKlass::cast(m->method_holder());
+      Handle loader(THREAD, mk->class_loader());
+      Handle domain(THREAD, mk->protection_domain());
+      mklass = SystemDictionary::resolve_or_fail(name, loader, domain,
+                                                 true, CHECK);
+    }
+    if (ptype_oop == NULL) {
+      // null does not match any non-reference; use Object to report the error
+      ptype_oop = object_java_mirror();
+    }
+    klassOop  pklass = NULL;
+    BasicType ptype  = java_lang_Class::as_BasicType(ptype_oop, &pklass);
+    if (!ss.at_return_type()) {
+      err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum);
+    } else {
+      err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal!
+    }
+    if (err != NULL)  break;
+  }
+
+  if (err != NULL) {
+    THROW_MSG(vmSymbols::java_lang_InternalError(), err);
+  }
+}
+
+// Main routine for verifying the MethodHandle.type of a proposed
+// direct or bound-direct method handle.
+void MethodHandles::verify_method_type(methodHandle m,
+                                       Handle mtype,
+                                       bool has_bound_recv,
+                                       KlassHandle bound_recv_type,
+                                       TRAPS) {
+  bool m_needs_receiver = !m->is_static();
+
+  const char* err = NULL;
+
+  int first_ptype_pos = m_needs_receiver ? 1 : 0;
+  if (has_bound_recv && err == NULL) {
+    first_ptype_pos -= 1;
+    if (m_needs_receiver && bound_recv_type.is_null())
+      { err = "bound receiver is not an object"; goto die; }
+  }
+
+  if (m_needs_receiver && err == NULL) {
+    objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype());
+    if (ptypes->length() < first_ptype_pos)
+      { err = "receiver argument is missing"; goto die; }
+    if (first_ptype_pos == -1)
+      err = check_method_receiver(m(), bound_recv_type->as_klassOop());
+    else
+      err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(0)));
+    if (err != NULL)  goto die;
+  }
+
+  // Check the other arguments for mistypes.
+  verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK);
+  return;
+
+ die:
+  THROW_MSG(vmSymbols::java_lang_InternalError(), err);
+}
+
+void MethodHandles::verify_vmslots(Handle mh, TRAPS) {
+  // Verify vmslots.
+  int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh()));
+  if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) {
+    THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH");
+  }
+}
+
+void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) {
+  // Verify that argslot points at the given argnum.
+  int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum);
+  if (argslot != check_slot || argslot < 0) {
+    const char* fmt = "for argnum of %d, vmargslot is %d, should be %d";
+    size_t msglen = strlen(fmt) + 3*11 + 1;
+    char* msg = NEW_RESOURCE_ARRAY(char, msglen);
+    jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot);
+    THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
+  }
+}
+
+// Verify the correspondence between two method types.
+// Apart from the advertised changes, caller method type X must
+// be able to invoke the callee method Y type with no violations
+// of type integrity.
+// Return NULL if all is well, else a short error message.
+const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end,
+                                                    int insert_argnum, oop insert_type,
+                                                    int change_argnum, oop change_type,
+                                                    int delete_argnum,
+                                                    oop dst_mtype, int dst_beg, int dst_end) {
+  objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype);
+  objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype);
+
+  int src_max = src_ptypes->length();
+  int dst_max = dst_ptypes->length();
+
+  if (src_end == -1)  src_end = src_max;
+  if (dst_end == -1)  dst_end = dst_max;
+
+  assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob");
+  assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob");
+
+  // pending actions; set to -1 when done:
+  int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum;
+
+  const char* err = NULL;
+
+  // Walk along each array of parameter types, including a virtual
+  // NULL end marker at the end of each.
+  for (int src_idx = src_beg, dst_idx = dst_beg;
+       (src_idx <= src_end && dst_idx <= dst_end);
+       src_idx++, dst_idx++) {
+    oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx);
+    oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx);
+    bool fix_null_src_type = false;
+
+    // Perform requested edits.
+    if (ins_idx == src_idx) {
+      // note that the inserted guy is never affected by a change or deletion
+      ins_idx = -1;
+      src_type = insert_type;
+      fix_null_src_type = true;
+      --src_idx;                // back up to process src type on next loop
+      src_idx = src_end;
+    } else {
+      // note that the changed guy can be immediately deleted
+      if (chg_idx == src_idx) {
+        chg_idx = -1;
+        assert(src_idx < src_end, "oob");
+        src_type = change_type;
+        fix_null_src_type = true;
+      }
+      if (del_idx == src_idx) {
+        del_idx = -1;
+        assert(src_idx < src_end, "oob");
+        --dst_idx;
+        continue;               // rerun loop after skipping this position
+      }
+    }
+
+    if (src_type == NULL && fix_null_src_type)
+      // explicit null in this case matches any dest reference
+      src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type);
+
+    // Compare the two argument types.
+    if (src_type != dst_type) {
+      if (src_type == NULL)  return "not enough arguments";
+      if (dst_type == NULL)  return "too many arguments";
+      err = check_argument_type_change(src_type, dst_type, dst_idx);
+      if (err != NULL)  return err;
+    }
+  }
+
+  // Now compare return types also.
+  oop src_rtype = java_dyn_MethodType::rtype(src_mtype);
+  oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype);
+  if (src_rtype != dst_rtype) {
+    err = check_return_type_change(dst_rtype, src_rtype); // note reversal!
+    if (err != NULL)  return err;
+  }
+
+  assert(err == NULL, "");
+  return NULL;  // all is well
+}
+
+
+const char* MethodHandles::check_argument_type_change(BasicType src_type,
+                                                     klassOop src_klass,
+                                                     BasicType dst_type,
+                                                     klassOop dst_klass,
+                                                     int argnum) {
+  const char* err = NULL;
+
+  // just in case:
+  if (src_type == T_ARRAY)  src_type = T_OBJECT;
+  if (dst_type == T_ARRAY)  dst_type = T_OBJECT;
+
+  // Produce some nice messages if VerifyMethodHandles is turned on:
+  if (!same_basic_type_for_arguments(src_type, dst_type, (argnum < 0))) {
+    if (src_type == T_OBJECT) {
+      err = ((argnum >= 0)
+             ? "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)
+             ? "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)
+             ? "type mismatch: passing a %s for method argument #%d, which expects %s"
+             : "type mismatch: returning a %s, but caller expects %s");
+    }
+  } else if (src_type == T_OBJECT && class_cast_needed(src_klass, dst_klass)) {
+    if (!class_cast_needed(dst_klass, src_klass)) {
+      err = ((argnum < 0)
+             ? "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)
+             ? "reference mismatch: passing a %s for method argument #%d, which expects %s"
+             : "reference mismatch: returning a %s, but caller expects %s");
+    }
+  } else {
+    // passed the obstacle course
+    return NULL;
+  }
+
+  // format, format, format
+  const char* src_name = type2name(src_type);
+  const char* dst_name = type2name(dst_type);
+  if (src_type == T_OBJECT)  src_name = Klass::cast(src_klass)->external_name();
+  if (dst_type == T_OBJECT)  dst_name = Klass::cast(dst_klass)->external_name();
+  if (src_name == NULL)  src_name = "unknown type";
+  if (dst_name == NULL)  dst_name = "unknown type";
+
+  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) {
+    assert(strstr(err, "%d") != NULL, "");
+    jio_snprintf(msg, msglen, err, src_name, argnum, dst_name);
+  } else {
+    assert(strstr(err, "%d") == NULL, "");
+    jio_snprintf(msg, msglen, err, src_name,         dst_name);
+  }
+  return msg;
+}
+
+// Compute the depth within the stack of the given argument, i.e.,
+// the combined size of arguments to the right of the given argument.
+// For the last argument (ptypes.length-1) this will be zero.
+// For the first argument (0) this will be the size of all
+// arguments but that one.  For the special number -1, this
+// will be the size of all arguments, including the first.
+// If the argument is neither -1 nor a valid argument index,
+// then return a negative number.  Otherwise, the result
+// is in the range [0..vmslots] inclusive.
+int MethodHandles::argument_slot(oop method_type, int arg) {
+  objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
+  int argslot = 0;
+  int len = ptypes->length();
+  if (arg < -1 || arg >= len)  return -99;
+  for (int i = len-1; i > arg; i--) {
+    BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
+    argslot += type2size[bt];
+  }
+  assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works");
+  return argslot;
+}
+
+// Given a slot number, return the argument number.
+int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) {
+  objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type);
+  int argslot = 0;
+  int len = ptypes->length();
+  for (int i = len-1; i >= 0; i--) {
+    if (query_argslot == argslot)  return i;
+    BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i));
+    argslot += type2size[bt];
+  }
+  // return pseudo-arg deepest in stack:
+  if (query_argslot == argslot)  return -1;
+  return -99;                   // oob slot, or splitting a double-slot arg
+}
+
+methodHandle MethodHandles::dispatch_decoded_method(methodHandle m,
+                                                    KlassHandle receiver_limit,
+                                                    int decode_flags,
+                                                    KlassHandle receiver_klass,
+                                                    TRAPS) {
+  assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference");
+  assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument");
+
+  if (!m->is_static() &&
+      (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder())))
+    // given type does not match class of method, or receiver is null!
+    // caller should have checked this, but let's be extra careful...
+    return methodHandle();
+
+  if (receiver_limit.not_null() &&
+      (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit())))
+    // given type is not limited to the receiver type
+    // note that a null receiver can match any reference value, for a static method
+    return methodHandle();
+
+  if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) {
+    // pre-dispatched or static method (null receiver is OK for static)
+    return m;
+
+  } else if (receiver_klass.is_null()) {
+    // null receiver value; cannot dispatch
+    return methodHandle();
+
+  } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) {
+    // perform virtual dispatch
+    int vtable_index = m->vtable_index();
+    guarantee(vtable_index >= 0, "valid vtable index");
+
+    // receiver_klass might be an arrayKlassOop but all vtables start at
+    // the same place. The cast is to avoid virtual call and assertion.
+    // See also LinkResolver::runtime_resolve_virtual_method.
+    instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass());
+    DEBUG_ONLY(inst->verify_vtable_index(vtable_index));
+    methodOop m_oop = inst->method_at_vtable(vtable_index);
+    return methodHandle(THREAD, m_oop);
+
+  } else {
+    // perform interface dispatch
+    int itable_index = klassItable::compute_itable_index(m());
+    guarantee(itable_index >= 0, "valid itable index");
+    instanceKlass* inst = instanceKlass::cast(receiver_klass());
+    methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD);
+    return methodHandle(THREAD, m_oop);
+  }
+}
+
+void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) {
+  // Verify type.
+  Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
+  verify_method_type(m, mtype, false, KlassHandle(), CHECK);
+
+  // Verify vmslots.
+  if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) {
+    THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH");
+  }
+}
+
+void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) {
+  // Check arguments.
+  if (mh.is_null() || m.is_null() ||
+      (!do_dispatch && m->is_abstract())) {
+    THROW(vmSymbols::java_lang_InternalError());
+  }
+
+  java_dyn_MethodHandle::init_vmslots(mh());
+
+  if (VerifyMethodHandles) {
+    // The privileged code which invokes this routine should not make
+    // a mistake about types, but it's better to verify.
+    verify_DirectMethodHandle(mh, m, CHECK);
+  }
+
+  // Finally, after safety checks are done, link to the target method.
+  // We will follow the same path as the latter part of
+  // InterpreterRuntime::resolve_invoke(), which first finds the method
+  // and then decides how to populate the constant pool cache entry
+  // that links the interpreter calls to the method.  We need the same
+  // bits, and will use the same calling sequence code.
+
+  int vmindex = methodOopDesc::garbage_vtable_index;
+  oop vmtarget = NULL;
+
+  instanceKlass::cast(m->method_holder())->link_class(CHECK);
+
+  MethodHandleEntry* me = NULL;
+  if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) {
+    // We are simulating an invokeinterface instruction.
+    // (We might also be simulating an invokevirtual on a miranda method,
+    // but it is safe to treat it as an invokeinterface.)
+    assert(!m->can_be_statically_bound(), "no final methods on interfaces");
+    vmindex = klassItable::compute_itable_index(m());
+    assert(vmindex >= 0, "(>=0) == do_dispatch");
+    // Set up same bits as ConstantPoolCacheEntry::set_interface_call().
+    vmtarget = m->method_holder(); // the interface
+    me = MethodHandles::entry(MethodHandles::_invokeinterface_mh);
+  } else if (!do_dispatch || m->can_be_statically_bound()) {
+    // We are simulating an invokestatic or invokespecial instruction.
+    // Set up the method pointer, just like ConstantPoolCacheEntry::set_method().
+    vmtarget = m();
+    // this does not help dispatch, but it will make it possible to parse this MH:
+    vmindex  = methodOopDesc::nonvirtual_vtable_index;
+    assert(vmindex < 0, "(>=0) == do_dispatch");
+    if (!m->is_static()) {
+      me = MethodHandles::entry(MethodHandles::_invokespecial_mh);
+    } else {
+      me = MethodHandles::entry(MethodHandles::_invokestatic_mh);
+      // Part of the semantics of a static call is an initialization barrier.
+      // For a DMH, it is done now, when the handle is created.
+      Klass* k = Klass::cast(m->method_holder());
+      if (k->should_be_initialized()) {
+        k->initialize(CHECK);
+      }
+    }
+  } else {
+    // We are simulating an invokevirtual instruction.
+    // Set up the vtable index, just like ConstantPoolCacheEntry::set_method().
+    // The key logic is LinkResolver::runtime_resolve_virtual_method.
+    vmindex  = m->vtable_index();
+    vmtarget = m->method_holder();
+    me = MethodHandles::entry(MethodHandles::_invokevirtual_mh);
+  }
+
+  if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+
+  sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget);
+  sun_dyn_DirectMethodHandle::set_vmindex(mh(),  vmindex);
+  DEBUG_ONLY(int flags; klassOop rlimit);
+  assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(),
+         "properly stored for later decoding");
+  DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0));
+  assert(!(actual_do_dispatch && !do_dispatch),
+         "do not perform dispatch if !do_dispatch specified");
+  assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch");
+  assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack");
+
+  // Done!
+  java_dyn_MethodHandle::set_vmentry(mh(), me);
+}
+
+void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh,
+                                                           methodHandle m,
+                                                           TRAPS) {
+  // Verify type.
+  oop receiver = sun_dyn_BoundMethodHandle::argument(mh());
+  Handle mtype(THREAD, java_dyn_MethodHandle::type(mh()));
+  KlassHandle bound_recv_type;
+  if (receiver != NULL)  bound_recv_type = KlassHandle(THREAD, receiver->klass());
+  verify_method_type(m, mtype, true, bound_recv_type, CHECK);
+
+  int receiver_pos = m->size_of_parameters() - 1;
+
+  // Verify MH.vmargslot, which should point at the bound receiver.
+  verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
+  //verify_vmslots(mh, CHECK);
+
+  // Verify vmslots.
+  if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) {
+    THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)");
+  }
+}
+
+// Initialize a BMH with a receiver bound directly to a methodOop.
+void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh,
+                                                         methodHandle original_m,
+                                                         KlassHandle receiver_limit,
+                                                         int decode_flags,
+                                                         TRAPS) {
+  // Check arguments.
+  if (mh.is_null() || original_m.is_null()) {
+    THROW(vmSymbols::java_lang_InternalError());
+  }
+
+  KlassHandle receiver_klass;
+  {
+    oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh());
+    if (receiver_oop != NULL)
+      receiver_klass = KlassHandle(THREAD, receiver_oop->klass());
+  }
+  methodHandle m = dispatch_decoded_method(original_m,
+                                           receiver_limit, decode_flags,
+                                           receiver_klass,
+                                           CHECK);
+  if (m.is_null())      { THROW(vmSymbols::java_lang_InternalError()); }
+  if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); }
+
+  java_dyn_MethodHandle::init_vmslots(mh());
+
+  if (VerifyMethodHandles) {
+    verify_BoundMethodHandle_with_receiver(mh, m, CHECK);
+  }
+
+  sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
+
+  DEBUG_ONLY(int junk; klassOop junk2);
+  assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding");
+  assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot");
+
+  // Done!
+  java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh));
+}
+
+void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
+                                             bool direct_to_method, TRAPS) {
+  Handle ptype_handle(THREAD,
+                           java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum));
+  KlassHandle ptype_klass;
+  BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass);
+  int slots_pushed = type2size[ptype];
+
+  oop argument = sun_dyn_BoundMethodHandle::argument(mh());
+
+  const char* err = NULL;
+
+  switch (ptype) {
+  case T_OBJECT:
+    if (argument != NULL)
+      // we must implicitly convert from the arg type to the outgoing ptype
+      err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum);
+    break;
+
+  case T_ARRAY: case T_VOID:
+    assert(false, "array, void do not appear here");
+  default:
+    if (ptype != T_INT && !is_subword_type(ptype)) {
+      err = "unexpected parameter type";
+      break;
+    }
+    // check subrange of Integer.value, if necessary
+    if (argument == NULL || argument->klass() != SystemDictionary::int_klass()) {
+      err = "bound integer argument must be of type java.lang.Integer";
+      break;
+    }
+    if (ptype != T_INT) {
+      int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
+      jint value = argument->int_field(value_offset);
+      int vminfo = adapter_subword_vminfo(ptype);
+      jint subword = truncate_subword_from_vminfo(value, vminfo);
+      if (value != subword) {
+        err = "bound subword value does not fit into the subword type";
+        break;
+      }
+    }
+    break;
+  case T_FLOAT:
+  case T_DOUBLE:
+  case T_LONG:
+    {
+      // we must implicitly convert from the unboxed arg type to the outgoing ptype
+      BasicType argbox = java_lang_boxing_object::basic_type(argument);
+      if (argbox != ptype) {
+        err = check_argument_type_change(T_OBJECT, (argument == NULL
+                                                    ? SystemDictionary::object_klass()
+                                                    : argument->klass()),
+                                         ptype, ptype_klass(), argnum);
+        assert(err != NULL, "this must be an error");
+      }
+      break;
+    }
+  }
+
+  if (err == NULL) {
+    DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
+    if (direct_to_method) {
+      assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots");
+      assert(slots_pushed <= MethodHandlePushLimit, "");
+    } else {
+      int prev_pushes = decode_MethodHandle_stack_pushes(target());
+      assert(this_pushes == slots_pushed + prev_pushes, "BMH stack motion must be correct");
+      // do not blow the stack; use a Java-based adapter if this limit is exceeded
+      if (slots_pushed + prev_pushes > MethodHandlePushLimit)
+        err = "too many bound parameters";
+    }
+  }
+
+  if (err == NULL) {
+    // Verify the rest of the method type.
+    err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()),
+                                      argnum, ptype_handle(),
+                                      java_dyn_MethodHandle::type(target()));
+  }
+
+  if (err != NULL) {
+    THROW_MSG(vmSymbols::java_lang_InternalError(), err);
+  }
+}
+
+void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
+  // Check arguments.
+  if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) {
+    THROW(vmSymbols::java_lang_InternalError());
+  }
+
+  java_dyn_MethodHandle::init_vmslots(mh());
+
+  if (VerifyMethodHandles) {
+    int insert_after = argnum - 1;
+    verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK);
+    verify_vmslots(mh, CHECK);
+  }
+
+  // If (a) the target is a direct non-dispatched method handle,
+  // or (b) the target is a dispatched direct method handle and we
+  // are binding the receiver, cut out the middle-man.
+  // Do this by decoding the DMH and using its methodOop directly as vmtarget.
+  bool direct_to_method = false;
+  if (OptimizeMethodHandles &&
+      target->klass() == SystemDictionary::DirectMethodHandle_klass() &&
+      (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) {
+    int decode_flags = 0; klassOop receiver_limit_oop = NULL;
+    methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags));
+    if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); }
+    DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - 1); // pos. of 1st arg.
+    assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig");
+    if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) {
+      KlassHandle receiver_limit(THREAD, receiver_limit_oop);
+      init_BoundMethodHandle_with_receiver(mh, m,
+                                           receiver_limit, decode_flags,
+                                           CHECK);
+      return;
+    }
+
+    // Even if it is not a bound receiver, we still might be able
+    // to bind another argument and still invoke the methodOop directly.
+    if (!(decode_flags & _dmf_does_dispatch)) {
+      direct_to_method = true;
+      sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m());
+    }
+  }
+  if (!direct_to_method)
+    sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target());
+
+  if (VerifyMethodHandles) {
+    verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK);
+  }
+
+  // Next question:  Is this a ref, int, or long bound value?
+  oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum);
+  BasicType ptype = java_lang_Class::as_BasicType(ptype_oop);
+  int slots_pushed = type2size[ptype];
+
+  MethodHandleEntry* me = NULL;
+  if (ptype == T_OBJECT) {
+    if (direct_to_method)  me = MethodHandles::entry(_bound_ref_direct_mh);
+    else                   me = MethodHandles::entry(_bound_ref_mh);
+  } else if (slots_pushed == 2) {
+    if (direct_to_method)  me = MethodHandles::entry(_bound_long_direct_mh);
+    else                   me = MethodHandles::entry(_bound_long_mh);
+  } else if (slots_pushed == 1) {
+    if (direct_to_method)  me = MethodHandles::entry(_bound_int_direct_mh);
+    else                   me = MethodHandles::entry(_bound_int_mh);
+  } else {
+    assert(false, "");
+  }
+
+  // Done!
+  java_dyn_MethodHandle::set_vmentry(mh(), me);
+}
+
+static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) {
+  char msg[200];
+  jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err);
+  THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg);
+}
+
+void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) {
+  jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh());
+  int  argslot    = sun_dyn_AdapterMethodHandle::vmargslot(mh());
+
+  verify_vmargslot(mh, argnum, argslot, CHECK);
+  verify_vmslots(mh, CHECK);
+
+  jint conv_op    = adapter_conversion_op(conversion);
+  if (!conv_op_valid(conv_op)) {
+    throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD);
+    return;
+  }
+  EntryKind ek = adapter_entry_kind(conv_op);
+
+  int stack_move = adapter_conversion_stack_move(conversion);
+  BasicType src  = adapter_conversion_src_type(conversion);
+  BasicType dest = adapter_conversion_dest_type(conversion);
+  int vminfo     = adapter_conversion_vminfo(conversion); // should be zero
+
+  Handle argument(THREAD,  sun_dyn_AdapterMethodHandle::argument(mh()));
+  Handle target(THREAD,    sun_dyn_AdapterMethodHandle::vmtarget(mh()));
+  Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh()));
+  Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target()));
+
+  const char* err = NULL;
+
+  if (err == NULL) {
+    // Check that the correct argument is supplied, but only if it is required.
+    switch (ek) {
+    case _adapter_check_cast:     // target type of cast
+    case _adapter_ref_to_prim:    // wrapper type from which to unbox
+    case _adapter_prim_to_ref:    // wrapper type to box into
+    case _adapter_collect_args:   // array type to collect into
+    case _adapter_spread_args:    // array type to spread from
+      if (!java_lang_Class::is_instance(argument())
+          || java_lang_Class::is_primitive(argument()))
+        { err = "adapter requires argument of type java.lang.Class"; break; }
+      if (ek == _adapter_collect_args ||
+          ek == _adapter_spread_args) {
+        // Make sure it is a suitable collection type.  (Array, for now.)
+        Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument()));
+        if (!ak->oop_is_objArray()) {
+          { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; }
+        }
+      }
+      break;
+    case _adapter_flyby:
+    case _adapter_ricochet:
+      if (!java_dyn_MethodHandle::is_instance(argument()))
+        { err = "MethodHandle adapter argument required"; break; }
+      break;
+    default:
+      if (argument.not_null())
+        { err = "adapter has spurious argument"; break; }
+      break;
+    }
+  }
+
+  if (err == NULL) {
+    // Check that the src/dest types are supplied if needed.
+    switch (ek) {
+    case _adapter_prim_to_prim:
+      if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) {
+        err = "adapter requires primitive src/dest conversion subfields"; break;
+      }
+      if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) ||
+          !(src == T_FLOAT || src == T_DOUBLE) &&  (dest == T_FLOAT || dest == T_DOUBLE)) {
+        err = "adapter cannot convert beween floating and fixed-point"; break;
+      }
+      break;
+    case _adapter_ref_to_prim:
+      if (src != T_OBJECT || !is_java_primitive(dest)
+          || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) {
+        err = "adapter requires primitive dest conversion subfield"; break;
+      }
+      break;
+    case _adapter_prim_to_ref:
+      if (!is_java_primitive(src) || dest != T_OBJECT
+          || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) {
+        err = "adapter requires primitive src conversion subfield"; break;
+      }
+      break;
+    case _adapter_swap_args:
+    case _adapter_rot_args:
+      {
+        if (!src || src != dest) {
+          err = "adapter requires src/dest conversion subfields for swap"; break;
+        }
+        int swap_size = type2size[src];
+        oop src_mtype  = sun_dyn_AdapterMethodHandle::type(target());
+        oop dest_mtype = sun_dyn_AdapterMethodHandle::type(mh());
+        int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(src_mtype);
+        int src_slot   = argslot;
+        int dest_slot  = vminfo;
+        bool rotate_up = (src_slot > dest_slot); // upward rotation
+        int src_arg    = argnum;
+        int dest_arg   = argument_slot_to_argnum(dest_mtype, dest_slot);
+        verify_vmargslot(mh, dest_arg, dest_slot, CHECK);
+        if (!(dest_slot >= src_slot + swap_size) &&
+            !(src_slot >= dest_slot + swap_size)) {
+          err = "source, destination slots must be distinct";
+        } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) {
+          err = "source of swap must be deeper in stack";
+        } else if (ek == _adapter_swap_args) {
+          err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg),
+                                           java_dyn_MethodType::ptype(dest_mtype, src_arg),
+                                           dest_arg);
+        } else if (ek == _adapter_rot_args) {
+          if (rotate_up) {
+            assert((src_slot > dest_slot) && (src_arg < dest_arg), "");
+            // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot]
+            // that is:   [src_arg+1..dest_arg] --> [src_arg..dest_arg-1]
+            for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) {
+              err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
+                                               java_dyn_MethodType::ptype(dest_mtype, i-1),
+                                               i);
+            }
+          } else { // rotate down
+            assert((src_slot < dest_slot) && (src_arg > dest_arg), "");
+            // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss]
+            // that is:     [dest_arg..src_arg-1] --> [dst_arg+1..src_arg]
+            for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) {
+              err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i),
+                                               java_dyn_MethodType::ptype(dest_mtype, i+1),
+                                               i);
+            }
+          }
+        }
+        if (err == NULL)
+          err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg),
+                                           java_dyn_MethodType::ptype(dest_mtype, dest_arg),
+                                           src_arg);
+      }
+      break;
+    case _adapter_collect_args:
+    case _adapter_spread_args:
+      {
+        BasicType coll_type = (ek == _adapter_collect_args) ? dest : src;
+        BasicType elem_type = (ek == _adapter_collect_args) ? src : dest;
+        if (coll_type != T_OBJECT || elem_type != T_OBJECT) {
+          err = "adapter requires src/dest subfields"; break;
+          // later:
+          // - consider making coll be a primitive array
+          // - consider making coll be a heterogeneous collection
+        }
+      }
+      break;
+    default:
+      if (src != 0 || dest != 0) {
+        err = "adapter has spurious src/dest conversion subfields"; break;
+      }
+      break;
+    }
+  }
+
+  if (err == NULL) {
+    // Check the stack_move subfield.
+    // It must always report the net change in stack size, positive or negative.
+    int slots_pushed = stack_move / stack_move_unit();
+    switch (ek) {
+    case _adapter_prim_to_prim:
+    case _adapter_ref_to_prim:
+    case _adapter_prim_to_ref:
+      if (slots_pushed != type2size[dest] - type2size[src]) {
+        err = "wrong stack motion for primitive conversion";
+      }
+      break;
+    case _adapter_dup_args:
+      if (slots_pushed <= 0) {
+        err = "adapter requires conversion subfield slots_pushed > 0";
+      }
+      break;
+    case _adapter_drop_args:
+      if (slots_pushed >= 0) {
+        err = "adapter requires conversion subfield slots_pushed < 0";
+      }
+      break;
+    case _adapter_collect_args:
+      if (slots_pushed > 1) {
+        err = "adapter requires conversion subfield slots_pushed <= 1";
+      }
+      break;
+    case _adapter_spread_args:
+      if (slots_pushed < -1) {
+        err = "adapter requires conversion subfield slots_pushed >= -1";
+      }
+      break;
+    default:
+      if (stack_move != 0) {
+        err = "adapter has spurious stack_move conversion subfield";
+      }
+      break;
+    }
+    if (err == NULL && stack_move != slots_pushed * stack_move_unit()) {
+      err = "stack_move conversion subfield must be multiple of stack_move_unit";
+    }
+  }
+
+  if (err == NULL) {
+    // Make sure this adapter does not push too deeply.
+    int slots_pushed = stack_move / stack_move_unit();
+    int this_vmslots = java_dyn_MethodHandle::vmslots(mh());
+    int prev_vmslots = java_dyn_MethodHandle::vmslots(target());
+    if (slots_pushed != (this_vmslots - prev_vmslots)) {
+      err = "stack_move inconsistent with previous and current MethodType vmslots";
+    } else if (slots_pushed > 0)  {
+      // verify stack_move against MethodHandlePushLimit
+      int prev_pushes = decode_MethodHandle_stack_pushes(target());
+      // do not blow the stack; use a Java-based adapter if this limit is exceeded
+      if (slots_pushed + prev_pushes > MethodHandlePushLimit) {
+        err = "adapter pushes too many parameters";
+      }
+    }
+
+    // While we're at it, check that the stack motion decoder works:
+    DEBUG_ONLY(int prev_pushes = decode_MethodHandle_stack_pushes(target()));
+    DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh()));
+    assert(this_pushes == slots_pushed + prev_pushes, "AMH stack motion must be correct");
+  }
+
+  if (err == NULL && vminfo != 0) {
+    switch (ek) {
+      case _adapter_swap_args:
+      case _adapter_rot_args:
+        break;                // OK
+    default:
+      err = "vminfo subfield is reserved to the JVM";
+    }
+  }
+
+  // Do additional ad hoc checks.
+  if (err == NULL) {
+    switch (ek) {
+    case _adapter_retype_only:
+      err = check_method_type_passthrough(src_mtype(), dst_mtype());
+      break;
+
+    case _adapter_check_cast:
+      {
+        // The actual value being checked must be a reference:
+        err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum),
+                                         object_java_mirror(), argnum);
+        if (err != NULL)  break;
+
+        // The output of the cast must fit with the destination argument:
+        Handle cast_class = argument;
+        err = check_method_type_conversion(src_mtype(),
+                                           argnum, cast_class(),
+                                           dst_mtype());
+      }
+      break;
+
+      // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles
+    }
+  }
+
+  if (err != NULL) {
+    throw_InternalError_for_bad_conversion(conversion, err, THREAD);
+    return;
+  }
+
+}
+
+void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) {
+  oop  argument   = sun_dyn_AdapterMethodHandle::argument(mh());
+  int  argslot    = sun_dyn_AdapterMethodHandle::vmargslot(mh());
+  jint conversion = sun_dyn_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);
+  EntryKind ek_opt  = ek_orig;  // may be optimized
+
+  // Finalize the vmtarget field (Java initialized it to null).
+  if (!java_dyn_MethodHandle::is_instance(target())) {
+    throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD);
+    return;
+  }
+  sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target());
+
+  if (VerifyMethodHandles) {
+    verify_AdapterMethodHandle(mh, argnum, CHECK);
+  }
+
+  int stack_move = adapter_conversion_stack_move(conversion);
+  BasicType src  = adapter_conversion_src_type(conversion);
+  BasicType dest = adapter_conversion_dest_type(conversion);
+  int vminfo     = adapter_conversion_vminfo(conversion); // should be zero
+
+  const char* err = NULL;
+
+  // Now it's time to finish the case analysis and pick a MethodHandleEntry.
+  switch (ek_orig) {
+  case _adapter_retype_only:
+  case _adapter_check_cast:
+  case _adapter_dup_args:
+  case _adapter_drop_args:
+    // these work fine via general case code
+    break;
+
+  case _adapter_prim_to_prim:
+    {
+      // Non-subword cases are {int,float,long,double} -> {int,float,long,double}.
+      // And, the {float,double} -> {int,long} cases must be handled by Java.
+      switch (type2size[src] *4+ type2size[dest]) {
+      case 1 *4+ 1:
+        assert(src == T_INT || is_subword_type(src), "source is not float");
+        // Subword-related cases are int -> {boolean,byte,char,short}.
+        ek_opt = _adapter_opt_i2i;
+        vminfo = adapter_subword_vminfo(dest);
+        break;
+      case 2 *4+ 1:
+        if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) {
+          ek_opt = _adapter_opt_l2i;
+          vminfo = adapter_subword_vminfo(dest);
+        } else if (src == T_DOUBLE && dest == T_FLOAT) {
+          ek_opt = _adapter_opt_d2f;
+        } else {
+          assert(false, "");
+        }
+        break;
+      case 1 *4+ 2:
+        if (src == T_INT && dest == T_LONG) {
+          ek_opt = _adapter_opt_i2l;
+        } else if (src == T_FLOAT && dest == T_DOUBLE) {
+          ek_opt = _adapter_opt_f2d;
+        } else {
+          assert(false, "");
+        }
+        break;
+      default:
+        assert(false, "");
+        break;
+      }
+    }
+    break;
+
+  case _adapter_ref_to_prim:
+    {
+      switch (type2size[dest]) {
+      case 1:
+        ek_opt = _adapter_opt_unboxi;
+        vminfo = adapter_subword_vminfo(dest);
+        break;
+      case 2:
+        ek_opt = _adapter_opt_unboxl;
+        break;
+      default:
+        assert(false, "");
+        break;
+      }
+    }
+    break;
+
+  case _adapter_prim_to_ref:
+    goto throw_not_impl;        // allocates, hence could block
+
+  case _adapter_swap_args:
+  case _adapter_rot_args:
+    {
+      int swap_slots = type2size[src];
+      oop mtype      = sun_dyn_AdapterMethodHandle::type(mh());
+      int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mtype);
+      int src_slot   = argslot;
+      int dest_slot  = vminfo;
+      int rotate     = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1;
+      switch (swap_slots) {
+      case 1:
+        ek_opt = (!rotate    ? _adapter_opt_swap_1 :
+                  rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down);
+        break;
+      case 2:
+        ek_opt = (!rotate    ? _adapter_opt_swap_2 :
+                  rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down);
+        break;
+      default:
+        assert(false, "");
+        break;
+      }
+    }
+    break;
+
+  case _adapter_collect_args:
+    goto throw_not_impl;        // allocates, hence could block
+
+  case _adapter_spread_args:
+    {
+      // vminfo will be the required length of the array
+      int slots_pushed = stack_move / stack_move_unit();
+      int array_size   = slots_pushed + 1;
+      assert(array_size >= 0, "");
+      vminfo = array_size;
+      switch (array_size) {
+      case 0:   ek_opt = _adapter_opt_spread_0;       break;
+      case 1:   ek_opt = _adapter_opt_spread_1;       break;
+      default:  ek_opt = _adapter_opt_spread_more;    break;
+      }
+      if ((vminfo & CONV_VMINFO_MASK) != vminfo)
+        goto throw_not_impl;    // overflow
+    }
+    break;
+
+  case _adapter_flyby:
+  case _adapter_ricochet:
+    goto throw_not_impl;        // runs Java code, hence could block
+
+  default:
+    // should have failed much earlier; must be a missing case here
+    assert(false, "incomplete switch");
+    // and fall through:
+
+  throw_not_impl:
+    // FIXME: these adapters are NYI
+    err = "adapter not yet implemented in the JVM";
+    break;
+  }
+
+  if (err != NULL) {
+    throw_InternalError_for_bad_conversion(conversion, err, THREAD);
+    return;
+  }
+
+  // Rebuild the conversion value; maybe parts of it were changed.
+  jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo);
+
+  // Finalize the conversion field.  (Note that it is final to Java code.)
+  sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion);
+
+  // Done!
+  java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt));
+
+  // There should be enough memory barriers on exit from native methods
+  // to ensure that the MH is fully initialized to all threads before
+  // Java code can publish it in global data structures.
+}
+
+//
+// Here are the native methods on sun.dyn.MethodHandleImpl.
+// They are the private interface between this JVM and the HotSpot-specific
+// Java code that implements JSR 292 method handles.
+//
+// Note:  We use a JVM_ENTRY macro to define each of these, for this is the way
+// that intrinsic (non-JNI) native methods are defined in HotSpot.
+//
+
+// direct method handles for invokestatic or invokespecial
+// void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller);
+JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh,
+                             jobject target_jh, jboolean do_dispatch, jobject caller_jh)) {
+  ResourceMark rm;              // for error messages
+
+  // This is the guy we are initializing:
+  if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+  Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
+
+  // Early returns out of this method leave the DMH in an unfinished state.
+  assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
+
+  // which method are we really talking about?
+  if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+  oop target_oop = JNIHandles::resolve_non_null(target_jh);
+  if (sun_dyn_MemberName::is_instance(target_oop) &&
+      sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) {
+    Handle mname(THREAD, target_oop);
+    MethodHandles::resolve_MemberName(mname, CHECK);
+    target_oop = mname(); // in case of GC
+  }
+
+  int decode_flags = 0; klassOop receiver_limit = NULL;
+  methodHandle m(THREAD,
+                 MethodHandles::decode_method(target_oop,
+                                              receiver_limit, decode_flags));
+  if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); }
+
+  // The trusted Java code that calls this method should already have performed
+  // access checks on behalf of the given caller.  But, we can verify this.
+  if (VerifyMethodHandles && caller_jh != NULL) {
+    KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)));
+    // If this were a bytecode, the first access check would be against
+    // the "reference class" mentioned in the CONSTANT_Methodref.
+    // For that class, we use the defining class of m,
+    // or a more specific receiver limit if available.
+    klassOop reference_klass = m->method_holder();  // OK approximation
+    if (receiver_limit != NULL && receiver_limit != reference_klass) {
+      if (!Klass::cast(receiver_limit)->is_subtype_of(reference_klass))
+        THROW_MSG(vmSymbols::java_lang_InternalError(), "receiver limit out of bounds");  // Java code bug
+      reference_klass = receiver_limit;
+    }
+    // Emulate LinkResolver::check_klass_accessability.
+    if (!Reflection::verify_class_access(caller->as_klassOop(),
+                                         reference_klass,
+                                         true)) {
+      THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(m->method_holder())->external_name());
+    }
+    // If there were a bytecode, the next step would be to lookup the method
+    // in the reference class, then then check the method's access bits.
+    // Emulate LinkResolver::check_method_accessability.
+    klassOop resolved_klass = m->method_holder();
+    if (!Reflection::verify_field_access(caller->as_klassOop(),
+                                         resolved_klass, reference_klass,
+                                         m->access_flags(),
+                                         true)) {
+      // %%% following cutout belongs in Reflection::verify_field_access?
+      bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(),
+                                                        reference_klass, THREAD);
+      if (!same_pm) {
+        THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string());
+      }
+    }
+  }
+
+  MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK);
+}
+JVM_END
+
+// bound method handles
+JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh,
+                             jobject target_jh, int argnum)) {
+  ResourceMark rm;              // for error messages
+
+  // This is the guy we are initializing:
+  if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+  Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
+
+  // Early returns out of this method leave the BMH in an unfinished state.
+  assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
+
+  if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+  Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
+
+  if (!java_dyn_MethodHandle::is_instance(target())) {
+    // Target object is a reflective method.  (%%% Do we need this alternate path?)
+    Untested("init_BMH of non-MH");
+    if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); }
+    int decode_flags = 0; klassOop receiver_limit_oop = NULL;
+    methodHandle m(THREAD,
+                   MethodHandles::decode_method(target(),
+                                                receiver_limit_oop,
+                                                decode_flags));
+    KlassHandle receiver_limit(THREAD, receiver_limit_oop);
+    MethodHandles::init_BoundMethodHandle_with_receiver(mh, m,
+                                                       receiver_limit,
+                                                       decode_flags,
+                                                       CHECK);
+    return;
+  }
+
+  // Build a BMH on top of a DMH or another BMH:
+  MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK);
+}
+JVM_END
+
+// adapter method handles
+JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh,
+                             jobject target_jh, int argnum)) {
+  // This is the guy we are initializing:
+  if (mh_jh == NULL || target_jh == NULL) {
+    THROW(vmSymbols::java_lang_InternalError());
+  }
+  Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh));
+  Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
+
+  // Early returns out of this method leave the AMH in an unfinished state.
+  assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null");
+
+  MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK);
+}
+JVM_END
+
+// method type forms
+JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) {
+  if (erased_jh == NULL)  return;
+  if (TraceMethodHandles) {
+    tty->print("creating MethodType form ");
+    if (WizardMode || Verbose) {   // Warning: this calls Java code on the MH!
+      // call Object.toString()
+      symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature();
+      JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh)));
+      JavaValue result(T_OBJECT);
+      JavaCalls::call_virtual(&result, SystemDictionary::object_klass(), name, sig,
+                              &args, CHECK);
+      Handle str(THREAD, (oop)result.get_jobject());
+      java_lang_String::print(str, tty);
+    }
+    tty->cr();
+  }
+}
+JVM_END
+
+// debugging and reflection
+JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) {
+  Handle mh(THREAD, JNIHandles::resolve(mh_jh));
+  if (!java_dyn_MethodHandle::is_instance(mh())) {
+    THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
+  }
+  oop target = MethodHandles::encode_target(mh, format, CHECK_NULL);
+  return JNIHandles::make_local(THREAD, target);
+}
+JVM_END
+
+JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) {
+  switch (which) {
+  case MethodHandles::GC_JVM_PUSH_LIMIT:
+    guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF,
+              "MethodHandlePushLimit parameter must be in valid range");
+    return MethodHandlePushLimit;
+  case MethodHandles::GC_JVM_STACK_MOVE_LIMIT:
+    // return number of words per slot, signed according to stack direction
+    return MethodHandles::stack_move_unit();
+  }
+  return 0;
+}
+JVM_END
+
+#ifndef PRODUCT
+#define EACH_NAMED_CON(template) \
+    template(MethodHandles,GC_JVM_PUSH_LIMIT) \
+    template(MethodHandles,GC_JVM_STACK_MOVE_LIMIT) \
+    template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \
+    template(MethodHandles,ETF_DIRECT_HANDLE) \
+    template(MethodHandles,ETF_METHOD_NAME) \
+    template(MethodHandles,ETF_REFLECT_METHOD) \
+    template(sun_dyn_MemberName,MN_IS_METHOD) \
+    template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \
+    template(sun_dyn_MemberName,MN_IS_FIELD) \
+    template(sun_dyn_MemberName,MN_IS_TYPE) \
+    template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \
+    template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \
+    template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \
+    template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \
+    template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \
+    template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \
+    template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \
+    template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \
+    template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \
+    template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \
+    template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \
+    template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \
+    template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \
+    template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \
+    template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \
+    template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \
+    template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \
+    template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \
+    template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \
+    template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \
+    template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \
+    template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \
+    template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \
+    template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \
+    template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \
+    /*end*/
+
+#define ONE_PLUS(scope,value) 1+
+static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0;
+#define VALUE_COMMA(scope,value) scope::value,
+static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 };
+#define STRING_NULL(scope,value) #value "\0"
+static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) };
+
+#undef ONE_PLUS
+#undef VALUE_COMMA
+#undef STRING_NULL
+#undef EACH_NAMED_CON
+#endif
+
+JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
+#ifndef PRODUCT
+  if (which >= 0 && which < con_value_count) {
+    int con = con_values[which];
+    objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh);
+    if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
+      const char* str = &con_names[0];
+      for (int i = 0; i < which; i++)
+        str += strlen(str) + 1;   // skip name and null
+      oop name = java_lang_String::create_oop_from_str(str, CHECK_0);
+      box->obj_at_put(0, name);
+    }
+    return con;
+  }
+#endif
+  return 0;
+}
+JVM_END
+
+// void init(MemberName self, AccessibleObject ref)
+JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
+  if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+  Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
+  oop target_oop = JNIHandles::resolve_non_null(target_jh);
+  MethodHandles::init_MemberName(mname(), target_oop);
+}
+JVM_END
+
+// void expand(MemberName self)
+JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
+  if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+  Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
+  MethodHandles::expand_MemberName(mname, 0, CHECK);
+}
+JVM_END
+
+// void resolve(MemberName self, Class<?> caller)
+JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
+  if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); }
+  Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
+  // %%% take caller into account!
+  MethodHandles::resolve_MemberName(mname, CHECK);
+}
+JVM_END
+
+//  static native int getMembers(Class<?> defc, String matchName, String matchSig,
+//          int matchFlags, Class<?> caller, int skip, MemberName[] results);
+JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls,
+                               jclass clazz_jh, jstring name_jh, jstring sig_jh,
+                               int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
+  if (clazz_jh == NULL || results_jh == NULL)  return -1;
+  klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh));
+
+  objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh);
+  if (results == NULL || !results->is_objArray())       return -1;
+
+  symbolOop name = NULL, sig = NULL;
+  if (name_jh != NULL) {
+    name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
+    if (name == NULL)  return 0; // a match is not possible
+  }
+  if (sig_jh != NULL) {
+    sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
+    if (sig == NULL)  return 0; // a match is not possible
+  }
+
+  klassOop caller = NULL;
+  if (caller_jh != NULL) {
+    oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
+    if (!java_lang_Class::is_instance(caller_oop))  return -1;
+    caller = java_lang_Class::as_klassOop(caller_oop);
+  }
+
+  if (name != NULL && sig != NULL && results != NULL) {
+    // try a direct resolve
+    // %%% TO DO
+  }
+
+  int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags,
+                                            caller, skip, results);
+  // TO DO: expand at least some of the MemberNames, to avoid massive callbacks
+  return res;
+}
+JVM_END
+
+
+/// JVM_RegisterMethodHandleMethods
+
+#define ADR "J"
+
+#define LANG "Ljava/lang/"
+#define JDYN "Ljava/dyn/"
+#define IDYN "Lsun/dyn/"
+
+#define OBJ   LANG"Object;"
+#define CLS   LANG"Class;"
+#define STRG  LANG"String;"
+#define MT    JDYN"MethodType;"
+#define MH    JDYN"MethodHandle;"
+#define MHI   IDYN"MethodHandleImpl;"
+#define MEM   IDYN"MemberName;"
+#define AMH   IDYN"AdapterMethodHandle;"
+#define BMH   IDYN"BoundMethodHandle;"
+#define DMH   IDYN"DirectMethodHandle;"
+
+#define CC (char*)  /*cast a literal from (const char*)*/
+#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
+
+// These are the native methods on sun.dyn.MethodHandleNatives.
+static JNINativeMethod methods[] = {
+  // void init(MemberName self, AccessibleObject ref)
+  {CC"init",                    CC"("AMH""MH"I)V",              FN_PTR(MHI_init_AMH)},
+  {CC"init",                    CC"("BMH""OBJ"I)V",             FN_PTR(MHI_init_BMH)},
+  {CC"init",                    CC"("DMH""OBJ"Z"CLS")V",        FN_PTR(MHI_init_DMH)},
+  {CC"init",                    CC"("MT")V",                    FN_PTR(MHI_init_MT)},
+  {CC"init",                    CC"("MEM""OBJ")V",              FN_PTR(MHI_init_Mem)},
+  {CC"expand",                  CC"("MEM")V",                   FN_PTR(MHI_expand_Mem)},
+  {CC"resolve",                 CC"("MEM""CLS")V",              FN_PTR(MHI_resolve_Mem)},
+  {CC"getTarget",               CC"("MH"I)"OBJ,                 FN_PTR(MHI_getTarget)},
+  {CC"getConstant",             CC"(I)I",                       FN_PTR(MHI_getConstant)},
+  //  static native int getNamedCon(int which, Object[] name)
+  {CC"getNamedCon",             CC"(I["OBJ")I",                 FN_PTR(MHI_getNamedCon)},
+  //  static native int getMembers(Class<?> defc, String matchName, String matchSig,
+  //          int matchFlags, Class<?> caller, int skip, MemberName[] results);
+  {CC"getMembers",              CC"("CLS""STRG""STRG"I"CLS"I["MEM")I",  FN_PTR(MHI_getMembers)}
+};
+
+
+// This one function is exported, used by NativeLookup.
+
+JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
+  assert(MethodHandles::spot_check_entry_names(), "entry enum is OK");
+
+  if (!EnableMethodHandles) {
+    warning("JSR 292 method handles are disabled in this JVM.  Use -XX:+EnableMethodHandles to enable.");
+    return;  // bind nothing
+  }
+
+  {
+    ThreadToNativeFromVM ttnfv(thread);
+
+    int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod));
+    if (env->ExceptionOccurred()) {
+      MethodHandles::set_enabled(false);
+      warning("JSR 292 method handle code is mismatched to this JVM.  Disabling support.");
+      env->ExceptionClear();
+    } else {
+      MethodHandles::set_enabled(true);
+    }
+  }
+}
+JVM_END
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/prims/methodHandles.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -0,0 +1,435 @@
+/*
+ * Copyright 2008-2009 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.
+ *
+ */
+
+class MacroAssembler;
+class Label;
+class MethodHandleEntry;
+
+class MethodHandles: AllStatic {
+  // JVM support for MethodHandle, MethodType, and related types
+  // in java.dyn and java.dyn.hotspot.
+  // See also  javaClasses for layouts java_dyn_Method{Handle,Type,Type::Form}.
+ public:
+  enum EntryKind {
+    _check_mtype,               // how a caller calls a MH
+    _wrong_method_type,         // what happens when there is a type mismatch
+    _invokestatic_mh,           // how a MH emulates invokestatic
+    _invokespecial_mh,          // ditto for the other invokes...
+    _invokevirtual_mh,
+    _invokeinterface_mh,
+    _bound_ref_mh,              // reference argument is bound
+    _bound_int_mh,              // int argument is bound (via an Integer or Float)
+    _bound_long_mh,             // long argument is bound (via a Long or Double)
+    _bound_ref_direct_mh,       // same as above, with direct linkage to methodOop
+    _bound_int_direct_mh,
+    _bound_long_direct_mh,
+
+    _adapter_mh_first,     // adapter sequence goes here...
+    _adapter_retype_only   = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY,
+    _adapter_check_cast    = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_CHECK_CAST,
+    _adapter_prim_to_prim  = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM,
+    _adapter_ref_to_prim   = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM,
+    _adapter_prim_to_ref   = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF,
+    _adapter_swap_args     = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS,
+    _adapter_rot_args      = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_ROT_ARGS,
+    _adapter_dup_args      = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DUP_ARGS,
+    _adapter_drop_args     = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DROP_ARGS,
+    _adapter_collect_args  = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_COLLECT_ARGS,
+    _adapter_spread_args   = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS,
+    _adapter_flyby         = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_FLYBY,
+    _adapter_ricochet      = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RICOCHET,
+    _adapter_mh_last       = _adapter_mh_first + sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT - 1,
+
+    // Optimized adapter types
+
+    // argument list reordering
+    _adapter_opt_swap_1,
+    _adapter_opt_swap_2,
+    _adapter_opt_rot_1_up,
+    _adapter_opt_rot_1_down,
+    _adapter_opt_rot_2_up,
+    _adapter_opt_rot_2_down,
+    // primitive single to single:
+    _adapter_opt_i2i,           // i2c, i2z, i2b, i2s
+    // primitive double to single:
+    _adapter_opt_l2i,
+    _adapter_opt_d2f,
+    // primitive single to double:
+    _adapter_opt_i2l,
+    _adapter_opt_f2d,
+    // conversion between floating point and integer type is handled by Java
+
+    // reference to primitive:
+    _adapter_opt_unboxi,
+    _adapter_opt_unboxl,
+
+    // spreading (array length cases 0, 1, >=2)
+    _adapter_opt_spread_0,
+    _adapter_opt_spread_1,
+    _adapter_opt_spread_more,
+
+    _EK_LIMIT,
+    _EK_FIRST = 0
+  };
+
+ public:
+  static bool enabled()                         { return _enabled; }
+  static void set_enabled(bool z);
+
+ private:
+  enum {  // import sun_dyn_AdapterMethodHandle::CONV_OP_*
+    CONV_OP_LIMIT         = sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT,
+    CONV_OP_MASK          = sun_dyn_AdapterMethodHandle::CONV_OP_MASK,
+    CONV_VMINFO_MASK      = sun_dyn_AdapterMethodHandle::CONV_VMINFO_MASK,
+    CONV_VMINFO_SHIFT     = sun_dyn_AdapterMethodHandle::CONV_VMINFO_SHIFT,
+    CONV_OP_SHIFT         = sun_dyn_AdapterMethodHandle::CONV_OP_SHIFT,
+    CONV_DEST_TYPE_SHIFT  = sun_dyn_AdapterMethodHandle::CONV_DEST_TYPE_SHIFT,
+    CONV_SRC_TYPE_SHIFT   = sun_dyn_AdapterMethodHandle::CONV_SRC_TYPE_SHIFT,
+    CONV_STACK_MOVE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_SHIFT,
+    CONV_STACK_MOVE_MASK  = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_MASK
+  };
+
+  static bool _enabled;
+  static MethodHandleEntry* _entries[_EK_LIMIT];
+  static const char*        _entry_names[_EK_LIMIT+1];
+  static bool ek_valid(EntryKind ek)            { return (uint)ek < (uint)_EK_LIMIT; }
+  static bool conv_op_valid(int op)             { return (uint)op < (uint)CONV_OP_LIMIT; }
+
+ public:
+  static bool    have_entry(EntryKind ek)       { return ek_valid(ek) && _entries[ek] != NULL; }
+  static MethodHandleEntry* entry(EntryKind ek) { assert(ek_valid(ek), "initialized");
+                                                  return _entries[ek]; }
+  static const char* entry_name(EntryKind ek)   { assert(ek_valid(ek), "oob");
+                                                  return _entry_names[ek]; }
+  static EntryKind adapter_entry_kind(int op)   { assert(conv_op_valid(op), "oob");
+                                                  return EntryKind(_adapter_mh_first + op); }
+
+  static void init_entry(EntryKind ek, MethodHandleEntry* me) {
+    assert(ek_valid(ek), "oob");
+    assert(_entries[ek] == NULL, "no double initialization");
+    _entries[ek] = me;
+  }
+
+  static jint adapter_conversion(int conv_op, BasicType src, BasicType dest,
+                                 int stack_move = 0, int vminfo = 0) {
+    assert(conv_op_valid(conv_op), "oob");
+    jint conv = ((conv_op      << CONV_OP_SHIFT)
+                 | (src        << CONV_SRC_TYPE_SHIFT)
+                 | (dest       << CONV_DEST_TYPE_SHIFT)
+                 | (stack_move << CONV_STACK_MOVE_SHIFT)
+                 | (vminfo     << CONV_VMINFO_SHIFT)
+                 );
+    assert(adapter_conversion_op(conv) == conv_op, "decode conv_op");
+    assert(adapter_conversion_src_type(conv) == src, "decode src");
+    assert(adapter_conversion_dest_type(conv) == dest, "decode dest");
+    assert(adapter_conversion_stack_move(conv) == stack_move, "decode stack_move");
+    assert(adapter_conversion_vminfo(conv) == vminfo, "decode vminfo");
+    return conv;
+  }
+  static int adapter_conversion_op(jint conv) {
+    return ((conv >> CONV_OP_SHIFT) & 0xF);
+  }
+  static BasicType adapter_conversion_src_type(jint conv) {
+    return (BasicType)((conv >> CONV_SRC_TYPE_SHIFT) & 0xF);
+  }
+  static BasicType adapter_conversion_dest_type(jint conv) {
+    return (BasicType)((conv >> CONV_DEST_TYPE_SHIFT) & 0xF);
+  }
+  static int adapter_conversion_stack_move(jint conv) {
+    return (conv >> CONV_STACK_MOVE_SHIFT);
+  }
+  static int adapter_conversion_vminfo(jint conv) {
+    return (conv >> CONV_VMINFO_SHIFT) & CONV_VMINFO_MASK;
+  }
+
+  // Offset in words that the interpreter stack pointer moves when an argument is pushed.
+  // The stack_move value must always be a multiple of this.
+  static int stack_move_unit() {
+    return frame::interpreter_frame_expression_stack_direction() * Interpreter::stackElementWords();
+  }
+
+  enum { CONV_VMINFO_SIGN_FLAG = 0x80 };
+  static int adapter_subword_vminfo(BasicType dest) {
+    if (dest == T_BOOLEAN) return (BitsPerInt -  1);
+    if (dest == T_CHAR)    return (BitsPerInt - 16);
+    if (dest == T_BYTE)    return (BitsPerInt -  8) | CONV_VMINFO_SIGN_FLAG;
+    if (dest == T_SHORT)   return (BitsPerInt - 16) | CONV_VMINFO_SIGN_FLAG;
+    return 0;                   // case T_INT
+  }
+  // Here is the transformation the i2i adapter must perform:
+  static int truncate_subword_from_vminfo(jint value, int vminfo) {
+    jint tem = value << vminfo;
+    if ((vminfo & CONV_VMINFO_SIGN_FLAG) != 0) {
+      return (jint)tem >> vminfo;
+    } else {
+      return (juint)tem >> vminfo;
+    }
+  }
+
+  static inline address from_compiled_entry(EntryKind ek);
+  static inline address from_interpreted_entry(EntryKind ek);
+
+  // helpers for decode_method.
+  static methodOop decode_methodOop(methodOop m, int& decode_flags_result);
+  static methodOop decode_vmtarget(oop vmtarget, int vmindex, oop mtype, klassOop& receiver_limit_result, int& decode_flags_result);
+  static methodOop decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result);
+  static methodOop decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
+  static methodOop decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
+  static methodOop decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
+  static methodOop decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
+
+  // Find out how many stack slots an mh pushes or pops.
+  // The result is *not* reported as a multiple of stack_move_unit();
+  // It is a signed net number of pushes (a difference in vmslots).
+  // To compare with a stack_move value, first multiply by stack_move_unit().
+  static int decode_MethodHandle_stack_pushes(oop mh);
+
+ public:
+  // working with member names
+  static void resolve_MemberName(Handle mname, TRAPS); // compute vmtarget/vmindex from name/type
+  static void expand_MemberName(Handle mname, int suppress, TRAPS);  // expand defc/name/type if missing
+  static void init_MemberName(oop mname_oop, oop target); // compute vmtarget/vmindex from target
+  static void init_MemberName(oop mname_oop, methodOop m, bool do_dispatch);
+  static void init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset);
+  static int find_MemberNames(klassOop k, symbolOop name, symbolOop sig,
+                              int mflags, klassOop caller,
+                              int skip, objArrayOop results);
+  // bit values for suppress argument to expand_MemberName:
+  enum { _suppress_defc = 1, _suppress_name = 2, _suppress_type = 4 };
+
+  // called from InterpreterGenerator and StubGenerator
+  static address generate_method_handle_interpreter_entry(MacroAssembler* _masm);
+  static void generate_method_handle_stub(MacroAssembler* _masm, EntryKind ek);
+
+  // argument list parsing
+  static int argument_slot(oop method_type, int arg);
+  static int argument_slot_count(oop method_type) { return argument_slot(method_type, -1); }
+  static int argument_slot_to_argnum(oop method_type, int argslot);
+
+  // Runtime support
+  enum {                        // bit-encoded flags from decode_method or decode_vmref
+    _dmf_has_receiver   = 0x01, // target method has leading reference argument
+    _dmf_does_dispatch  = 0x02, // method handle performs virtual or interface dispatch
+    _dmf_from_interface = 0x04, // peforms interface dispatch
+    _DMF_DIRECT_MASK    = (_dmf_from_interface*2 - _dmf_has_receiver),
+    _dmf_binds_method   = 0x08,
+    _dmf_binds_argument = 0x10,
+    _DMF_BOUND_MASK     = (_dmf_binds_argument*2 - _dmf_binds_method),
+    _dmf_adapter_lsb    = 0x20,
+    _DMF_ADAPTER_MASK   = (_dmf_adapter_lsb << CONV_OP_LIMIT) - _dmf_adapter_lsb
+  };
+  static methodOop decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result);
+  enum {
+    // format of query to getConstant:
+    GC_JVM_PUSH_LIMIT = 0,
+    GC_JVM_STACK_MOVE_LIMIT = 1,
+
+    // format of result from getTarget / encode_target:
+    ETF_HANDLE_OR_METHOD_NAME = 0, // all available data (immediate MH or method)
+    ETF_DIRECT_HANDLE         = 1, // ultimate method handle (will be a DMH, may be self)
+    ETF_METHOD_NAME           = 2, // ultimate method as MemberName
+    ETF_REFLECT_METHOD        = 3  // ultimate method as java.lang.reflect object (sans refClass)
+  };
+  static int get_named_constant(int which, Handle name_box, TRAPS);
+  static oop encode_target(Handle mh, int format, TRAPS); // report vmtarget (to Java code)
+  static bool class_cast_needed(klassOop src, klassOop dst);
+
+ private:
+  // These checkers operate on a pair of whole MethodTypes:
+  static const char* check_method_type_change(oop src_mtype, int src_beg, int src_end,
+                                              int insert_argnum, oop insert_type,
+                                              int change_argnum, oop change_type,
+                                              int delete_argnum,
+                                              oop dst_mtype, int dst_beg, int dst_end);
+  static const char* check_method_type_insertion(oop src_mtype,
+                                                 int insert_argnum, oop insert_type,
+                                                 oop dst_mtype) {
+    oop no_ref = NULL;
+    return check_method_type_change(src_mtype, 0, -1,
+                                    insert_argnum, insert_type,
+                                    -1, no_ref, -1, dst_mtype, 0, -1);
+  }
+  static const char* check_method_type_conversion(oop src_mtype,
+                                                  int change_argnum, oop change_type,
+                                                  oop dst_mtype) {
+    oop no_ref = NULL;
+    return check_method_type_change(src_mtype, 0, -1, -1, no_ref,
+                                    change_argnum, change_type,
+                                    -1, dst_mtype, 0, -1);
+  }
+  static const char* check_method_type_passthrough(oop src_mtype, oop dst_mtype) {
+    oop no_ref = NULL;
+    return check_method_type_change(src_mtype, 0, -1,
+                                    -1, no_ref, -1, no_ref, -1,
+                                    dst_mtype, 0, -1);
+  }
+
+  // These checkers operate on pairs of argument or return types:
+  static const char* check_argument_type_change(BasicType src_type, klassOop src_klass,
+                                                BasicType dst_type, klassOop dst_klass,
+                                                int argnum);
+
+  static const char* check_argument_type_change(oop src_type, oop dst_type,
+                                                int argnum) {
+    klassOop src_klass = NULL, dst_klass = NULL;
+    BasicType src_bt = java_lang_Class::as_BasicType(src_type, &src_klass);
+    BasicType dst_bt = java_lang_Class::as_BasicType(dst_type, &dst_klass);
+    return check_argument_type_change(src_bt, src_klass,
+                                      dst_bt, dst_klass, argnum);
+  }
+
+  static const char* check_return_type_change(oop src_type, oop dst_type) {
+    return check_argument_type_change(src_type, dst_type, -1);
+  }
+
+  static const char* check_return_type_change(BasicType src_type, klassOop src_klass,
+                                              BasicType dst_type, klassOop dst_klass) {
+    return check_argument_type_change(src_type, src_klass, dst_type, dst_klass, -1);
+  }
+
+  static const char* check_method_receiver(methodOop m, klassOop passed_recv_type);
+
+  // These verifiers can block, and will throw an error if the checking fails:
+  static void verify_vmslots(Handle mh, TRAPS);
+  static void verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS);
+
+  static void verify_method_type(methodHandle m, Handle mtype,
+                                 bool has_bound_oop,
+                                 KlassHandle bound_oop_type,
+                                 TRAPS);
+
+  static void verify_method_signature(methodHandle m, Handle mtype,
+                                      int first_ptype_pos,
+                                      KlassHandle insert_ptype, TRAPS);
+
+  static void verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS);
+  static void verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
+                                       bool direct_to_method, TRAPS);
+  static void verify_BoundMethodHandle_with_receiver(Handle mh, methodHandle m, TRAPS);
+  static void verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS);
+
+ public:
+
+  // Fill in the fields of a DirectMethodHandle mh.  (MH.type must be pre-filled.)
+  static void init_DirectMethodHandle(Handle mh, methodHandle method, bool do_dispatch, TRAPS);
+
+  // Fill in the fields of a BoundMethodHandle mh.  (MH.type, BMH.argument must be pre-filled.)
+  static void init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS);
+  static void init_BoundMethodHandle_with_receiver(Handle mh,
+                                                   methodHandle original_m,
+                                                   KlassHandle receiver_limit,
+                                                   int decode_flags,
+                                                   TRAPS);
+
+  // Fill in the fields of an AdapterMethodHandle mh.  (MH.type must be pre-filled.)
+  static void init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS);
+
+#ifdef ASSERT
+  static bool spot_check_entry_names();
+#endif
+
+ private:
+  static methodHandle dispatch_decoded_method(methodHandle m,
+                                              KlassHandle receiver_limit,
+                                              int decode_flags,
+                                              KlassHandle receiver_klass,
+                                              TRAPS);
+
+  static bool same_basic_type_for_arguments(BasicType src, BasicType dst,
+                                            bool for_return = false);
+  static bool same_basic_type_for_returns(BasicType src, BasicType dst) {
+    return same_basic_type_for_arguments(src, dst, true);
+  }
+
+  enum {                        // arg_mask values
+    _INSERT_NO_MASK   = -1,
+    _INSERT_REF_MASK  = 0,
+    _INSERT_INT_MASK  = 1,
+    _INSERT_LONG_MASK = 3
+  };
+  static void insert_arg_slots(MacroAssembler* _masm,
+                               RegisterOrConstant arg_slots,
+                               int arg_mask,
+                               Register rax_argslot,
+                               Register rbx_temp, Register rdx_temp);
+
+  static void remove_arg_slots(MacroAssembler* _masm,
+                               RegisterOrConstant arg_slots,
+                               Register rax_argslot,
+                               Register rbx_temp, Register rdx_temp);
+};
+
+
+// Access methods for the "entry" field of a java.dyn.MethodHandle.
+// The field is primarily a jump target for compiled calls.
+// However, we squirrel away some nice pointers for other uses,
+// just before the jump target.
+// Aspects of a method handle entry:
+//  - from_compiled_entry - stub used when compiled code calls the MH
+//  - from_interpreted_entry - stub used when the interpreter calls the MH
+//  - type_checking_entry - stub for runtime casting between MHForm siblings (NYI)
+class MethodHandleEntry {
+ public:
+  class Data {
+    friend class MethodHandleEntry;
+    size_t              _total_size; // size including Data and code stub
+    MethodHandleEntry*  _type_checking_entry;
+    address             _from_interpreted_entry;
+    MethodHandleEntry* method_entry() { return (MethodHandleEntry*)(this + 1); }
+  };
+
+  Data*     data()                              { return (Data*)this - 1; }
+
+  address   start_address()                     { return (address) data(); }
+  address   end_address()                       { return start_address() + data()->_total_size; }
+
+  address   from_compiled_entry()               { return (address) this; }
+
+  address   from_interpreted_entry()            { return data()->_from_interpreted_entry; }
+  void  set_from_interpreted_entry(address e)   { data()->_from_interpreted_entry = e; }
+
+  MethodHandleEntry* type_checking_entry()           { return data()->_type_checking_entry; }
+  void set_type_checking_entry(MethodHandleEntry* e) { data()->_type_checking_entry = e; }
+
+  void set_end_address(address end_addr) {
+    size_t total_size = end_addr - start_address();
+    assert(total_size > 0 && total_size < 0x1000, "reasonable end address");
+    data()->_total_size = total_size;
+  }
+
+  // Compiler support:
+  static int from_interpreted_entry_offset_in_bytes() {
+    return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) );
+  }
+  static int type_checking_entry_offset_in_bytes() {
+    return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) );
+  }
+
+  static address            start_compiled_entry(MacroAssembler* _masm,
+                                                 address interpreted_entry = NULL);
+  static MethodHandleEntry* finish_compiled_entry(MacroAssembler* masm, address start_addr);
+};
+
+address MethodHandles::from_compiled_entry(EntryKind ek) { return entry(ek)->from_compiled_entry(); }
+address MethodHandles::from_interpreted_entry(EntryKind ek) { return entry(ek)->from_interpreted_entry(); }
--- a/src/share/vm/prims/nativeLookup.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/prims/nativeLookup.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -78,6 +78,7 @@
 
 extern "C" {
   void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls);
+  void JNICALL JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass unsafecls);
   void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass);
 }
 
@@ -97,6 +98,9 @@
   if (strstr(jni_name, "Java_sun_misc_Unsafe_registerNatives") != NULL) {
     return CAST_FROM_FN_PTR(address, JVM_RegisterUnsafeMethods);
   }
+  if (strstr(jni_name, "Java_sun_dyn_MethodHandleNatives_registerNatives") != NULL) {
+    return CAST_FROM_FN_PTR(address, JVM_RegisterMethodHandleMethods);
+  }
   if (strstr(jni_name, "Java_sun_misc_Perf_registerNatives") != NULL) {
     return CAST_FROM_FN_PTR(address, JVM_RegisterPerfMethods);
   }
--- a/src/share/vm/runtime/arguments.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/runtime/arguments.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -2619,6 +2619,13 @@
   }
 #endif // PRODUCT
 
+  if (EnableMethodHandles && !AnonymousClasses) {
+    if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
+      warning("forcing AnonymousClasses true to enable EnableMethodHandles");
+    }
+    AnonymousClasses = true;
+  }
+
   if (PrintGCDetails) {
     // Turn on -verbose:gc options as well
     PrintGC = true;
--- a/src/share/vm/runtime/globals.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/runtime/globals.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -3298,6 +3298,21 @@
   product(bool, AnonymousClasses, false,                                    \
           "support sun.misc.Unsafe.defineAnonymousClass")                   \
                                                                             \
+  product(bool, EnableMethodHandles, false,                                 \
+          "support method handles (true by default under JSR 292)")         \
+                                                                            \
+  diagnostic(intx, MethodHandlePushLimit, 3,                                \
+          "number of additional stack slots a method handle may push")      \
+                                                                            \
+  develop(bool, TraceMethodHandles, false,                                  \
+          "trace internal method handle operations")                        \
+                                                                            \
+  diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
+          "perform extra checks when constructing method handles")          \
+                                                                            \
+  diagnostic(bool, OptimizeMethodHandles, true,                             \
+          "when constructing method handles, try to improve them")          \
+                                                                            \
   product(bool, TaggedStackInterpreter, false,                              \
           "Insert tags in interpreter execution stack for oopmap generaion")\
                                                                             \
--- a/src/share/vm/runtime/sharedRuntime.cpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/runtime/sharedRuntime.cpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1471,9 +1471,73 @@
   return generate_class_cast_message(objName, targetKlass->external_name());
 }
 
+char* SharedRuntime::generate_wrong_method_type_message(JavaThread* thread,
+                                                        oopDesc* required,
+                                                        oopDesc* actual) {
+  assert(EnableMethodHandles, "");
+  oop singleKlass = wrong_method_type_is_for_single_argument(thread, required);
+  if (singleKlass != NULL) {
+    const char* objName = "argument or return value";
+    if (actual != NULL) {
+      // be flexible about the junk passed in:
+      klassOop ak = (actual->is_klass()
+                     ? (klassOop)actual
+                     : actual->klass());
+      objName = Klass::cast(ak)->external_name();
+    }
+    Klass* targetKlass = Klass::cast(required->is_klass()
+                                     ? (klassOop)required
+                                     : java_lang_Class::as_klassOop(required));
+    return generate_class_cast_message(objName, targetKlass->external_name());
+  } else {
+    // %%% need to get the MethodType string, without messing around too much
+    // Get a signature from the invoke instruction
+    const char* mhName = "method handle";
+    const char* targetType = "the required signature";
+    vframeStream vfst(thread, true);
+    if (!vfst.at_end()) {
+      Bytecode_invoke* call = Bytecode_invoke_at(vfst.method(), vfst.bci());
+      methodHandle target;
+      {
+        EXCEPTION_MARK;
+        target = call->static_target(THREAD);
+        if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; }
+      }
+      if (target.not_null()
+          && target->is_method_handle_invoke()
+          && required == target->method_handle_type()) {
+        targetType = target->signature()->as_C_string();
+      }
+    }
+    klassOop kignore; int fignore;
+    methodOop actual_method = MethodHandles::decode_method(actual,
+                                                          kignore, fignore);
+    if (actual_method != NULL) {
+      if (actual_method->name() == vmSymbols::invoke_name())
+        mhName = "$";
+      else
+        mhName = actual_method->signature()->as_C_string();
+      if (mhName[0] == '$')
+        mhName = actual_method->signature()->as_C_string();
+    }
+    return generate_class_cast_message(mhName, targetType,
+                                       " cannot be called as ");
+  }
+}
+
+oop SharedRuntime::wrong_method_type_is_for_single_argument(JavaThread* thr,
+                                                            oopDesc* required) {
+  if (required == NULL)  return NULL;
+  if (required->klass() == SystemDictionary::class_klass())
+    return required;
+  if (required->is_klass())
+    return Klass::cast(klassOop(required))->java_mirror();
+  return NULL;
+}
+
+
 char* SharedRuntime::generate_class_cast_message(
-    const char* objName, const char* targetKlassName) {
-  const char* desc = " cannot be cast to ";
+    const char* objName, const char* targetKlassName, const char* desc) {
   size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
 
   char* message = NEW_RESOURCE_ARRAY(char, msglen);
--- a/src/share/vm/runtime/sharedRuntime.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/runtime/sharedRuntime.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -212,10 +212,32 @@
   static char* generate_class_cast_message(JavaThread* thr, const char* name);
 
   /**
+   * Fill in the message for a WrongMethodTypeException
+   *
+   * @param thr the current thread
+   * @param mtype (optional) expected method type (or argument class)
+   * @param mhandle (optional) actual method handle (or argument)
+   * @return the dynamically allocated exception message
+   *
+   * BCP for the frame on top of the stack must refer to an
+   * 'invokevirtual' op for a method handle, or an 'invokedyamic' op.
+   * The caller (or one of its callers) must use a ResourceMark
+   * in order to correctly free the result.
+   */
+  static char* generate_wrong_method_type_message(JavaThread* thr,
+                                                  oopDesc* mtype = NULL,
+                                                  oopDesc* mhandle = NULL);
+
+  /** Return non-null if the mtype is a klass or Class, not a MethodType. */
+  static oop wrong_method_type_is_for_single_argument(JavaThread* thr,
+                                                      oopDesc* mtype);
+
+  /**
    * Fill in the "X cannot be cast to a Y" message for ClassCastException
    *
    * @param name the name of the class of the object attempted to be cast
    * @param klass the name of the target klass attempt
+   * @param gripe the specific kind of problem being reported
    * @return the dynamically allocated exception message (must be freed
    * by the caller using a resource mark)
    *
@@ -224,7 +246,8 @@
    * The caller (or one of it's callers) must use a ResourceMark
    * in order to correctly free the result.
    */
-  static char* generate_class_cast_message(const char* name, const char* klass);
+  static char* generate_class_cast_message(const char* name, const char* klass,
+                                           const char* gripe = " cannot be cast to ");
 
   // Resolves a call site- may patch in the destination of the call into the
   // compiled code.
--- a/src/share/vm/utilities/accessFlags.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/utilities/accessFlags.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2009 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
@@ -47,6 +47,8 @@
   JVM_ACC_IS_OLD                  = 0x00010000,     // RedefineClasses() has replaced this method
   JVM_ACC_IS_OBSOLETE             = 0x00020000,     // RedefineClasses() has made method obsolete
   JVM_ACC_IS_PREFIXED_NATIVE      = 0x00040000,     // JVMTI has prefixed this native method
+  JVM_MH_INVOKE_BITS           // = 0x10001100      // MethodHandle.invoke quasi-native
+                                  = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_MONITOR_MATCH),
 
   // klassOop flags
   JVM_ACC_HAS_MIRANDA_METHODS     = 0x10000000,     // True if this class has miranda methods in it's vtable
@@ -72,6 +74,7 @@
 
                                                     // flags accepted by set_field_flags()
   JVM_ACC_FIELD_FLAGS                = 0x00008000 | JVM_ACC_WRITTEN_FLAGS
+
 };
 
 
@@ -114,6 +117,15 @@
   bool is_obsolete             () const { return (_flags & JVM_ACC_IS_OBSOLETE            ) != 0; }
   bool is_prefixed_native      () const { return (_flags & JVM_ACC_IS_PREFIXED_NATIVE     ) != 0; }
 
+  // JSR 292:  A method of the form MethodHandle.invoke(A...)R method is
+  // neither bytecoded nor a JNI native, but rather a fast call through
+  // a lightweight method handle object.  Because it is not bytecoded,
+  // it has the native bit set, but the monitor-match bit is also set
+  // to distinguish it from a JNI native (which never has the match bit set).
+  // The synthetic bit is also present, because such a method is never
+  // explicitly defined in Java code.
+  bool is_method_handle_invoke () const { return (_flags & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS; }
+
   // klassOop flags
   bool has_miranda_methods     () const { return (_flags & JVM_ACC_HAS_MIRANDA_METHODS    ) != 0; }
   bool has_vanilla_constructor () const { return (_flags & JVM_ACC_HAS_VANILLA_CONSTRUCTOR) != 0; }
@@ -199,6 +211,14 @@
   jshort as_short()                    { return (jshort)_flags; }
   jint   as_int()                      { return _flags; }
 
+  inline friend AccessFlags accessFlags_from(jint flags);
+
   // Printing/debugging
   void print_on(outputStream* st) const PRODUCT_RETURN;
 };
+
+inline AccessFlags accessFlags_from(jint flags) {
+  AccessFlags af;
+  af._flags = flags;
+  return af;
+}
--- a/src/share/vm/utilities/exceptions.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/utilities/exceptions.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -237,6 +237,9 @@
 #define THROW_ARG_0(name, signature, arg)   THROW_ARG_(name, signature, arg, 0)
 #define THROW_MSG_CAUSE_0(name, message, cause) THROW_MSG_CAUSE_(name, message, cause, 0)
 
+#define THROW_NULL(name)                    THROW_(name, NULL)
+#define THROW_MSG_NULL(name, message)       THROW_MSG_(name, message, NULL)
+
 // The CATCH macro checks that no exception has been thrown by a function; it is used at
 // call sites about which is statically known that the callee cannot throw an exception
 // even though it is declared with TRAPS.
--- a/src/share/vm/utilities/globalDefinitions.hpp	Wed Apr 08 00:12:59 2009 -0700
+++ b/src/share/vm/utilities/globalDefinitions.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -408,6 +408,15 @@
   return T_BOOLEAN <= t && t <= T_LONG;
 }
 
+inline bool is_subword_type(BasicType t) {
+  // these guys are processed exactly like T_INT in calling sequences:
+  return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
+}
+
+inline bool is_signed_subword_type(BasicType t) {
+  return (t == T_BYTE || t == T_SHORT);
+}
+
 // Convert a char from a classfile signature to a BasicType
 inline BasicType char2type(char c) {
   switch( c ) {