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 /*

  * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "asm/assembler.hpp"

 #include "interpreter/bytecodeHistogram.hpp"

 #include "interpreter/cppInterpreter.hpp"

 #include "interpreter/interpreter.hpp"

 #include "interpreter/interpreterGenerator.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "oops/arrayOop.hpp"

 #include "oops/methodDataOop.hpp"

 #include "oops/methodOop.hpp"

 #include "oops/oop.inline.hpp"

 #include "prims/jvmtiExport.hpp"

 #include "prims/jvmtiThreadState.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/deoptimization.hpp"

 #include "runtime/frame.inline.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/stubRoutines.hpp"

 #include "runtime/synchronizer.hpp"

 #include "runtime/timer.hpp"

 #include "runtime/vframeArray.hpp"

 #include "utilities/debug.hpp"

 #ifdef SHARK

 #include "shark/shark_globals.hpp"

 #endif

 #ifdef CC_INTERP

 // Routine exists to make tracebacks look decent in debugger

 // while "shadow" interpreter frames are on stack. It is also

 // used to distinguish interpreter frames.

 extern "C" void RecursiveInterpreterActivation(interpreterState istate) {

   ShouldNotReachHere();

 }

 bool CppInterpreter::contains(address pc) {

   return ( _code->contains(pc) ||

          ( pc == (CAST_FROM_FN_PTR(address, RecursiveInterpreterActivation) + frame::pc_return_offset)));

 }

 #define STATE(field_name) Lstate, in_bytes(byte_offset_of(BytecodeInterpreter, field_name))

 #define __ _masm->

 Label frame_manager_entry;

 Label fast_accessor_slow_entry_path;  // fast accessor methods need to be able to jmp to unsynchronized

                                       // c++ interpreter entry point this holds that entry point label.

 static address unctrap_frame_manager_entry  = NULL;

 static address interpreter_return_address  = NULL;

 static address deopt_frame_manager_return_atos  = NULL;

 static address deopt_frame_manager_return_btos  = NULL;

 static address deopt_frame_manager_return_itos  = NULL;

 static address deopt_frame_manager_return_ltos  = NULL;

 static address deopt_frame_manager_return_ftos  = NULL;

 static address deopt_frame_manager_return_dtos  = NULL;

 static address deopt_frame_manager_return_vtos  = NULL;

 const Register prevState = G1_scratch;

 void InterpreterGenerator::save_native_result(void) {

   // result potentially in O0/O1: save it across calls

   __ stf(FloatRegisterImpl::D, F0, STATE(_native_fresult));

 #ifdef _LP64

   __ stx(O0, STATE(_native_lresult));

 #else

   __ std(O0, STATE(_native_lresult));

 #endif

 }

 void InterpreterGenerator::restore_native_result(void) {

   // Restore any method result value

   __ ldf(FloatRegisterImpl::D, STATE(_native_fresult), F0);

 #ifdef _LP64

   __ ldx(STATE(_native_lresult), O0);

 #else

   __ ldd(STATE(_native_lresult), O0);

 #endif

 }

 // A result handler converts/unboxes a native call result into

 // a java interpreter/compiler result. The current frame is an

 // interpreter frame. The activation frame unwind code must be

 // consistent with that of TemplateTable::_return(...). In the

 // case of native methods, the caller's SP was not modified.

 address CppInterpreterGenerator::generate_result_handler_for(BasicType type) {

   address entry = __ pc();

   Register Itos_i  = Otos_i ->after_save();

   Register Itos_l  = Otos_l ->after_save();

   Register Itos_l1 = Otos_l1->after_save();

   Register Itos_l2 = Otos_l2->after_save();

   switch (type) {

     case T_BOOLEAN: __ subcc(G0, O0, G0); __ addc(G0, 0, Itos_i); break; // !0 => true; 0 => false

     case T_CHAR   : __ sll(O0, 16, O0); __ srl(O0, 16, Itos_i);   break; // cannot use and3, 0xFFFF too big as immediate value!

     case T_BYTE   : __ sll(O0, 24, O0); __ sra(O0, 24, Itos_i);   break;

     case T_SHORT  : __ sll(O0, 16, O0); __ sra(O0, 16, Itos_i);   break;

     case T_LONG   :

 #ifndef _LP64

                     __ mov(O1, Itos_l2);  // move other half of long

 #endif              // ifdef or no ifdef, fall through to the T_INT case

     case T_INT    : __ mov(O0, Itos_i);                         break;

     case T_VOID   : /* nothing to do */                         break;

     case T_FLOAT  : assert(F0 == Ftos_f, "fix this code" );     break;

     case T_DOUBLE : assert(F0 == Ftos_d, "fix this code" );     break;

     case T_OBJECT :

       __ ld_ptr(STATE(_oop_temp), Itos_i);

       __ verify_oop(Itos_i);

       break;

     default       : ShouldNotReachHere();

   }

   __ ret();                           // return from interpreter activation

   __ delayed()->restore(I5_savedSP, G0, SP);  // remove interpreter frame

   NOT_PRODUCT(__ emit_long(0);)       // marker for disassembly

   return entry;

 }

 // tosca based result to c++ interpreter stack based result.

 // Result goes to address in L1_scratch

 address CppInterpreterGenerator::generate_tosca_to_stack_converter(BasicType type) {

   // A result is in the native abi result register from a native method call.

   // We need to return this result to the interpreter by pushing the result on the interpreter's

   // stack. This is relatively simple the destination is in L1_scratch

   // i.e. L1_scratch is the first free element on the stack. If we "push" a return value we must

   // adjust L1_scratch

   address entry = __ pc();

   switch (type) {

     case T_BOOLEAN:

       // !0 => true; 0 => false

       __ subcc(G0, O0, G0);

       __ addc(G0, 0, O0);

       __ st(O0, L1_scratch, 0);

       __ sub(L1_scratch, wordSize, L1_scratch);

       break;

     // cannot use and3, 0xFFFF too big as immediate value!

     case T_CHAR   :

       __ sll(O0, 16, O0);

       __ srl(O0, 16, O0);

       __ st(O0, L1_scratch, 0);

       __ sub(L1_scratch, wordSize, L1_scratch);

       break;

     case T_BYTE   :

       __ sll(O0, 24, O0);

       __ sra(O0, 24, O0);

       __ st(O0, L1_scratch, 0);

       __ sub(L1_scratch, wordSize, L1_scratch);

       break;

     case T_SHORT  :

       __ sll(O0, 16, O0);

       __ sra(O0, 16, O0);

       __ st(O0, L1_scratch, 0);

       __ sub(L1_scratch, wordSize, L1_scratch);

       break;

     case T_LONG   :

 #ifndef _LP64

 #if defined(COMPILER2)

   // All return values are where we want them, except for Longs.  C2 returns

   // longs in G1 in the 32-bit build whereas the interpreter wants them in O0/O1.

   // Since the interpreter will return longs in G1 and O0/O1 in the 32bit

   // build even if we are returning from interpreted we just do a little

   // stupid shuffing.

   // Note: I tried to make c2 return longs in O0/O1 and G1 so we wouldn't have to

   // do this here. Unfortunately if we did a rethrow we'd see an machepilog node

   // first which would move g1 -> O0/O1 and destroy the exception we were throwing.

       __ stx(G1, L1_scratch, -wordSize);

 #else

       // native result is in O0, O1

       __ st(O1, L1_scratch, 0);                      // Low order

       __ st(O0, L1_scratch, -wordSize);              // High order

 #endif /* COMPILER2 */

 #else

       __ stx(O0, L1_scratch, -wordSize);

 #endif

       __ sub(L1_scratch, 2*wordSize, L1_scratch);

       break;

     case T_INT    :

       __ st(O0, L1_scratch, 0);

       __ sub(L1_scratch, wordSize, L1_scratch);

       break;

     case T_VOID   : /* nothing to do */

       break;

     case T_FLOAT  :

       __ stf(FloatRegisterImpl::S, F0, L1_scratch, 0);

       __ sub(L1_scratch, wordSize, L1_scratch);

       break;

     case T_DOUBLE :

       // Every stack slot is aligned on 64 bit, However is this

       // the correct stack slot on 64bit?? QQQ

       __ stf(FloatRegisterImpl::D, F0, L1_scratch, -wordSize);

       __ sub(L1_scratch, 2*wordSize, L1_scratch);

       break;

     case T_OBJECT :

       __ verify_oop(O0);

       __ st_ptr(O0, L1_scratch, 0);

       __ sub(L1_scratch, wordSize, L1_scratch);

       break;

     default       : ShouldNotReachHere();

   }

   __ retl();                          // return from interpreter activation

   __ delayed()->nop();                // schedule this better

   NOT_PRODUCT(__ emit_long(0);)       // marker for disassembly

   return entry;

 }

 address CppInterpreterGenerator::generate_stack_to_stack_converter(BasicType type) {

   // A result is in the java expression stack of the interpreted method that has just

   // returned. Place this result on the java expression stack of the caller.

   //

   // The current interpreter activation in Lstate is for the method just returning its

   // result. So we know that the result of this method is on the top of the current

   // execution stack (which is pre-pushed) and will be return to the top of the caller

   // stack. The top of the callers stack is the bottom of the locals of the current

   // activation.

   // Because of the way activation are managed by the frame manager the value of esp is

   // below both the stack top of the current activation and naturally the stack top

   // of the calling activation. This enable this routine to leave the return address

   // to the frame manager on the stack and do a vanilla return.

   //

   // On entry: O0 - points to source (callee stack top)

   //           O1 - points to destination (caller stack top [i.e. free location])

   // destroys O2, O3

   //

   address entry = __ pc();

   switch (type) {

     case T_VOID:  break;

       break;

     case T_FLOAT  :

     case T_BOOLEAN:

     case T_CHAR   :

     case T_BYTE   :

     case T_SHORT  :

     case T_INT    :

       // 1 word result

       __ ld(O0, 0, O2);

       __ st(O2, O1, 0);

       __ sub(O1, wordSize, O1);

       break;

     case T_DOUBLE  :

     case T_LONG    :

       // return top two words on current expression stack to caller's expression stack

       // The caller's expression stack is adjacent to the current frame manager's intepretState

       // except we allocated one extra word for this intepretState so we won't overwrite it

       // when we return a two word result.

 #ifdef _LP64

       __ ld_ptr(O0, 0, O2);

       __ st_ptr(O2, O1, -wordSize);

 #else

       __ ld(O0, 0, O2);

       __ ld(O0, wordSize, O3);

       __ st(O3, O1, 0);

       __ st(O2, O1, -wordSize);

 #endif

       __ sub(O1, 2*wordSize, O1);

       break;

     case T_OBJECT :

       __ ld_ptr(O0, 0, O2);

       __ verify_oop(O2);                                               // verify it

       __ st_ptr(O2, O1, 0);

       __ sub(O1, wordSize, O1);

       break;

     default       : ShouldNotReachHere();

   }

   __ retl();

   __ delayed()->nop(); // QQ schedule this better

   return entry;

 }

 address CppInterpreterGenerator::generate_stack_to_native_abi_converter(BasicType type) {

   // A result is in the java expression stack of the interpreted method that has just

   // returned. Place this result in the native abi that the caller expects.

   // We are in a new frame registers we set must be in caller (i.e. callstub) frame.

   //

   // Similar to generate_stack_to_stack_converter above. Called at a similar time from the

   // frame manager execept in this situation the caller is native code (c1/c2/call_stub)

   // and so rather than return result onto caller's java expression stack we return the

   // result in the expected location based on the native abi.

   // On entry: O0 - source (stack top)

   // On exit result in expected output register

   // QQQ schedule this better

   address entry = __ pc();

   switch (type) {

     case T_VOID:  break;

       break;

     case T_FLOAT  :

       __ ldf(FloatRegisterImpl::S, O0, 0, F0);

       break;

     case T_BOOLEAN:

     case T_CHAR   :

     case T_BYTE   :

     case T_SHORT  :

     case T_INT    :

       // 1 word result

       __ ld(O0, 0, O0->after_save());

       break;

     case T_DOUBLE  :

       __ ldf(FloatRegisterImpl::D, O0, 0, F0);

       break;

     case T_LONG    :

       // return top two words on current expression stack to caller's expression stack

       // The caller's expression stack is adjacent to the current frame manager's interpretState

       // except we allocated one extra word for this intepretState so we won't overwrite it

       // when we return a two word result.

 #ifdef _LP64

       __ ld_ptr(O0, 0, O0->after_save());

 #else

       __ ld(O0, wordSize, O1->after_save());

       __ ld(O0, 0, O0->after_save());

 #endif

 #if defined(COMPILER2) && !defined(_LP64)

       // C2 expects long results in G1 we can't tell if we're returning to interpreted

       // or compiled so just be safe use G1 and O0/O1

       // Shift bits into high (msb) of G1

       __ sllx(Otos_l1->after_save(), 32, G1);

       // Zero extend low bits

       __ srl (Otos_l2->after_save(), 0, Otos_l2->after_save());

       __ or3 (Otos_l2->after_save(), G1, G1);

 #endif /* COMPILER2 */

       break;

     case T_OBJECT :

       __ ld_ptr(O0, 0, O0->after_save());

       __ verify_oop(O0->after_save());                                               // verify it

       break;

     default       : ShouldNotReachHere();

   }

   __ retl();

   __ delayed()->nop();

   return entry;

 }

 address CppInterpreter::return_entry(TosState state, int length) {

   // make it look good in the debugger

   return CAST_FROM_FN_PTR(address, RecursiveInterpreterActivation) + frame::pc_return_offset;

 }

 address CppInterpreter::deopt_entry(TosState state, int length) {

   address ret = NULL;

   if (length != 0) {

     switch (state) {

       case atos: ret = deopt_frame_manager_return_atos; break;

       case btos: ret = deopt_frame_manager_return_btos; break;

       case ctos:

       case stos:

       case itos: ret = deopt_frame_manager_return_itos; break;

       case ltos: ret = deopt_frame_manager_return_ltos; break;

       case ftos: ret = deopt_frame_manager_return_ftos; break;

       case dtos: ret = deopt_frame_manager_return_dtos; break;

       case vtos: ret = deopt_frame_manager_return_vtos; break;

     }

   } else {

     ret = unctrap_frame_manager_entry;  // re-execute the bytecode ( e.g. uncommon trap)

   }

   assert(ret != NULL, "Not initialized");

   return ret;

 }

 //

 // Helpers for commoning out cases in the various type of method entries.

 //

 // increment invocation count & check for overflow

 //

 // Note: checking for negative value instead of overflow

 //       so we have a 'sticky' overflow test

 //

 // Lmethod: method

 // ??: invocation counter

 //

 void InterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {

   // Update standard invocation counters

   __ increment_invocation_counter(O0, G3_scratch);

   if (ProfileInterpreter) {  // %%% Merge this into methodDataOop

     __ ld_ptr(STATE(_method), G3_scratch);

     Address interpreter_invocation_counter(G3_scratch, 0, in_bytes(methodOopDesc::interpreter_invocation_counter_offset()));

     __ ld(interpreter_invocation_counter, G3_scratch);

     __ inc(G3_scratch);

     __ st(G3_scratch, interpreter_invocation_counter);

   }

   Address invocation_limit(G3_scratch, (address)&InvocationCounter::InterpreterInvocationLimit);

   __ sethi(invocation_limit);

   __ ld(invocation_limit, G3_scratch);

   __ cmp(O0, G3_scratch);

   __ br(Assembler::greaterEqualUnsigned, false, Assembler::pn, *overflow);

   __ delayed()->nop();

 }

 address InterpreterGenerator::generate_empty_entry(void) {

   // A method that does nothing but return...

   address entry = __ pc();

   Label slow_path;

   __ verify_oop(G5_method);

   // do nothing for empty methods (do not even increment invocation counter)

   if ( UseFastEmptyMethods) {

     // If we need a safepoint check, generate full interpreter entry.

     Address sync_state(G3_scratch, SafepointSynchronize::address_of_state());

     __ load_contents(sync_state, G3_scratch);

     __ cmp(G3_scratch, SafepointSynchronize::_not_synchronized);

     __ br(Assembler::notEqual, false, Assembler::pn, frame_manager_entry);

     __ delayed()->nop();

     // Code: _return

     __ retl();

     __ delayed()->mov(O5_savedSP, SP);

     return entry;

   }

   return NULL;

 }

 // Call an accessor method (assuming it is resolved, otherwise drop into

 // vanilla (slow path) entry

 // Generates code to elide accessor methods

 // Uses G3_scratch and G1_scratch as scratch

 address InterpreterGenerator::generate_accessor_entry(void) {

   // Code: _aload_0, _(i|a)getfield, _(i|a)return or any rewrites thereof;

   // parameter size = 1

   // Note: We can only use this code if the getfield has been resolved

   //       and if we don't have a null-pointer exception => check for

   //       these conditions first and use slow path if necessary.

   address entry = __ pc();

   Label slow_path;

   if ( UseFastAccessorMethods) {

     // Check if we need to reach a safepoint and generate full interpreter

     // frame if so.

     Address sync_state(G3_scratch, SafepointSynchronize::address_of_state());

     __ load_contents(sync_state, G3_scratch);

     __ cmp(G3_scratch, SafepointSynchronize::_not_synchronized);

     __ br(Assembler::notEqual, false, Assembler::pn, slow_path);

     __ delayed()->nop();

     // Check if local 0 != NULL

     __ ld_ptr(Gargs, G0, Otos_i ); // get local 0

     __ tst(Otos_i);  // check if local 0 == NULL and go the slow path

     __ brx(Assembler::zero, false, Assembler::pn, slow_path);

     __ delayed()->nop();

     // read first instruction word and extract bytecode @ 1 and index @ 2

     // get first 4 bytes of the bytecodes (big endian!)

     __ ld_ptr(Address(G5_method, 0, in_bytes(methodOopDesc::const_offset())), G1_scratch);

     __ ld(Address(G1_scratch, 0, in_bytes(constMethodOopDesc::codes_offset())), G1_scratch);

     // move index @ 2 far left then to the right most two bytes.

     __ sll(G1_scratch, 2*BitsPerByte, G1_scratch);

     __ srl(G1_scratch, 2*BitsPerByte - exact_log2(in_words(

                       ConstantPoolCacheEntry::size()) * BytesPerWord), G1_scratch);

     // get constant pool cache

     __ ld_ptr(G5_method, in_bytes(methodOopDesc::constants_offset()), G3_scratch);

     __ ld_ptr(G3_scratch, constantPoolOopDesc::cache_offset_in_bytes(), G3_scratch);

     // get specific constant pool cache entry

     __ add(G3_scratch, G1_scratch, G3_scratch);

     // Check the constant Pool cache entry to see if it has been resolved.

     // If not, need the slow path.

     ByteSize cp_base_offset = constantPoolCacheOopDesc::base_offset();

     __ ld_ptr(G3_scratch, in_bytes(cp_base_offset + ConstantPoolCacheEntry::indices_offset()), G1_scratch);

     __ srl(G1_scratch, 2*BitsPerByte, G1_scratch);

     __ and3(G1_scratch, 0xFF, G1_scratch);

     __ cmp(G1_scratch, Bytecodes::_getfield);

     __ br(Assembler::notEqual, false, Assembler::pn, slow_path);

     __ delayed()->nop();

     // Get the type and return field offset from the constant pool cache

     __ ld_ptr(G3_scratch, in_bytes(cp_base_offset + ConstantPoolCacheEntry::flags_offset()), G1_scratch);

     __ ld_ptr(G3_scratch, in_bytes(cp_base_offset + ConstantPoolCacheEntry::f2_offset()), G3_scratch);

     Label xreturn_path;

     // Need to differentiate between igetfield, agetfield, bgetfield etc.

     // because they are different sizes.

     // Get the type from the constant pool cache

     __ srl(G1_scratch, ConstantPoolCacheEntry::tosBits, G1_scratch);

     // Make sure we don't need to mask G1_scratch for tosBits after the above shift

     ConstantPoolCacheEntry::verify_tosBits();

     __ cmp(G1_scratch, atos );

     __ br(Assembler::equal, true, Assembler::pt, xreturn_path);

     __ delayed()->ld_ptr(Otos_i, G3_scratch, Otos_i);

     __ cmp(G1_scratch, itos);

     __ br(Assembler::equal, true, Assembler::pt, xreturn_path);

     __ delayed()->ld(Otos_i, G3_scratch, Otos_i);

     __ cmp(G1_scratch, stos);

     __ br(Assembler::equal, true, Assembler::pt, xreturn_path);

     __ delayed()->ldsh(Otos_i, G3_scratch, Otos_i);

     __ cmp(G1_scratch, ctos);

     __ br(Assembler::equal, true, Assembler::pt, xreturn_path);

     __ delayed()->lduh(Otos_i, G3_scratch, Otos_i);

 #ifdef ASSERT

     __ cmp(G1_scratch, btos);

     __ br(Assembler::equal, true, Assembler::pt, xreturn_path);

     __ delayed()->ldsb(Otos_i, G3_scratch, Otos_i);

     __ should_not_reach_here();

 #endif

     __ ldsb(Otos_i, G3_scratch, Otos_i);

     __ bind(xreturn_path);

     // _ireturn/_areturn

     __ retl();                      // return from leaf routine

     __ delayed()->mov(O5_savedSP, SP);

     // Generate regular method entry

     __ bind(slow_path);

     __ ba(false, fast_accessor_slow_entry_path);

     __ delayed()->nop();

     return entry;

   }

   return NULL;

 }

 address InterpreterGenerator::generate_Reference_get_entry(void) {

 #ifndef SERIALGC

   if (UseG1GC) {

     // We need to generate have a routine that generates code to:

     //   * load the value in the referent field

     //   * passes that value to the pre-barrier.

     //

     // In the case of G1 this will record the value of the

     // referent in an SATB buffer if marking is active.

     // This will cause concurrent marking to mark the referent

     // field as live.

     Unimplemented();

   }

 #endif // SERIALGC

   // If G1 is not enabled then attempt to go through the accessor entry point

   // Reference.get is an accessor

   return generate_accessor_entry();

 }

 //

 // Interpreter stub for calling a native method. (C++ interpreter)

 // This sets up a somewhat different looking stack for calling the native method

 // than the typical interpreter frame setup.

 //

 address InterpreterGenerator::generate_native_entry(bool synchronized) {

   address entry = __ pc();

   // the following temporary registers are used during frame creation

   const Register Gtmp1 = G3_scratch ;

   const Register Gtmp2 = G1_scratch;

   const Address size_of_parameters(G5_method, 0, in_bytes(methodOopDesc::size_of_parameters_offset()));

   bool inc_counter  = UseCompiler || CountCompiledCalls;

   // make sure registers are different!

   assert_different_registers(G2_thread, G5_method, Gargs, Gtmp1, Gtmp2);

   const Address access_flags      (G5_method, 0, in_bytes(methodOopDesc::access_flags_offset()));

   Label Lentry;

   __ bind(Lentry);

   __ verify_oop(G5_method);

   const Register Glocals_size = G3;

   assert_different_registers(Glocals_size, G4_scratch, Gframe_size);

   // make sure method is native & not abstract

   // rethink these assertions - they can be simplified and shared (gri 2/25/2000)

 #ifdef ASSERT

   __ ld(access_flags, Gtmp1);

   {

     Label L;

     __ btst(JVM_ACC_NATIVE, Gtmp1);

     __ br(Assembler::notZero, false, Assembler::pt, L);

     __ delayed()->nop();

     __ stop("tried to execute non-native method as native");

     __ bind(L);

   }

   { Label L;

     __ btst(JVM_ACC_ABSTRACT, Gtmp1);

     __ br(Assembler::zero, false, Assembler::pt, L);

     __ delayed()->nop();

     __ stop("tried to execute abstract method as non-abstract");

     __ bind(L);

   }

 #endif // ASSERT

   __ lduh(size_of_parameters, Gtmp1);

   __ sll(Gtmp1, LogBytesPerWord, Gtmp2);       // parameter size in bytes

   __ add(Gargs, Gtmp2, Gargs);                 // points to first local + BytesPerWord

   // NEW

   __ add(Gargs, -wordSize, Gargs);             // points to first local[0]

   // generate the code to allocate the interpreter stack frame

   // NEW FRAME ALLOCATED HERE

   // save callers original sp

   // __ mov(SP, I5_savedSP->after_restore());

   generate_compute_interpreter_state(Lstate, G0, true);

   // At this point Lstate points to new interpreter state

   //

   const Address do_not_unlock_if_synchronized(G2_thread, 0,

       in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));

   // Since at this point in the method invocation the exception handler

   // would try to exit the monitor of synchronized methods which hasn't

   // been entered yet, we set the thread local variable

   // _do_not_unlock_if_synchronized to true. If any exception was thrown by

   // runtime, exception handling i.e. unlock_if_synchronized_method will

   // check this thread local flag.

   // This flag has two effects, one is to force an unwind in the topmost

   // interpreter frame and not perform an unlock while doing so.

   __ movbool(true, G3_scratch);

   __ stbool(G3_scratch, do_not_unlock_if_synchronized);

   // increment invocation counter and check for overflow

   //

   // Note: checking for negative value instead of overflow

   //       so we have a 'sticky' overflow test (may be of

   //       importance as soon as we have true MT/MP)

   Label invocation_counter_overflow;

   if (inc_counter) {

     generate_counter_incr(&invocation_counter_overflow, NULL, NULL);

   }

   Label Lcontinue;

   __ bind(Lcontinue);

   bang_stack_shadow_pages(true);

   // reset the _do_not_unlock_if_synchronized flag

   __ stbool(G0, do_not_unlock_if_synchronized);

   // check for synchronized methods

   // Must happen AFTER invocation_counter check, so method is not locked

   // if counter overflows.

   if (synchronized) {

     lock_method();

     // Don't see how G2_thread is preserved here...

     // __ verify_thread(); QQQ destroys L0,L1 can't use

   } else {

 #ifdef ASSERT

     { Label ok;

       __ ld_ptr(STATE(_method), G5_method);

       __ ld(access_flags, O0);

       __ btst(JVM_ACC_SYNCHRONIZED, O0);

       __ br( Assembler::zero, false, Assembler::pt, ok);

       __ delayed()->nop();

       __ stop("method needs synchronization");

       __ bind(ok);

     }

 #endif // ASSERT

   }

   // start execution

 //   __ verify_thread(); kills L1,L2 can't  use at the moment

   // jvmti/jvmpi support

   __ notify_method_entry();

   // native call

   // (note that O0 is never an oop--at most it is a handle)

   // It is important not to smash any handles created by this call,

   // until any oop handle in O0 is dereferenced.

   // (note that the space for outgoing params is preallocated)

   // get signature handler

   Label pending_exception_present;

   { Label L;

     __ ld_ptr(STATE(_method), G5_method);

     __ ld_ptr(Address(G5_method, 0, in_bytes(methodOopDesc::signature_handler_offset())), G3_scratch);

     __ tst(G3_scratch);

     __ brx(Assembler::notZero, false, Assembler::pt, L);

     __ delayed()->nop();

     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), G5_method, false);

     __ ld_ptr(STATE(_method), G5_method);

     Address exception_addr(G2_thread, 0, in_bytes(Thread::pending_exception_offset()));

     __ ld_ptr(exception_addr, G3_scratch);

     __ br_notnull(G3_scratch, false, Assembler::pn, pending_exception_present);

     __ delayed()->nop();

     __ ld_ptr(Address(G5_method, 0, in_bytes(methodOopDesc::signature_handler_offset())), G3_scratch);

     __ bind(L);

   }

   // Push a new frame so that the args will really be stored in

   // Copy a few locals across so the new frame has the variables

   // we need but these values will be dead at the jni call and

   // therefore not gc volatile like the values in the current

   // frame (Lstate in particular)

   // Flush the state pointer to the register save area

   // Which is the only register we need for a stack walk.

   __ st_ptr(Lstate, SP, (Lstate->sp_offset_in_saved_window() * wordSize) + STACK_BIAS);

   __ mov(Lstate, O1);         // Need to pass the state pointer across the frame

   // Calculate current frame size

   __ sub(SP, FP, O3);         // Calculate negative of current frame size

   __ save(SP, O3, SP);        // Allocate an identical sized frame

   __ mov(I1, Lstate);          // In the "natural" register.

   // Note I7 has leftover trash. Slow signature handler will fill it in

   // should we get there. Normal jni call will set reasonable last_Java_pc

   // below (and fix I7 so the stack trace doesn't have a meaningless frame

   // in it).

   // call signature handler

   __ ld_ptr(STATE(_method), Lmethod);

   __ ld_ptr(STATE(_locals), Llocals);

   __ callr(G3_scratch, 0);

   __ delayed()->nop();

   __ ld_ptr(STATE(_thread), G2_thread);        // restore thread (shouldn't be needed)

   { Label not_static;

     __ ld_ptr(STATE(_method), G5_method);

     __ ld(access_flags, O0);

     __ btst(JVM_ACC_STATIC, O0);

     __ br( Assembler::zero, false, Assembler::pt, not_static);

     __ delayed()->

       // get native function entry point(O0 is a good temp until the very end)

        ld_ptr(Address(G5_method, 0, in_bytes(methodOopDesc::native_function_offset())), O0);

     // for static methods insert the mirror argument

     const int mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();

     __ ld_ptr(Address(G5_method, 0, in_bytes(methodOopDesc:: constants_offset())), O1);

     __ ld_ptr(Address(O1, 0, constantPoolOopDesc::pool_holder_offset_in_bytes()), O1);

     __ ld_ptr(O1, mirror_offset, O1);

     // where the mirror handle body is allocated:

 #ifdef ASSERT

     if (!PrintSignatureHandlers)  // do not dirty the output with this

     { Label L;

       __ tst(O1);

       __ brx(Assembler::notZero, false, Assembler::pt, L);

       __ delayed()->nop();

       __ stop("mirror is missing");

       __ bind(L);

     }

 #endif // ASSERT

     __ st_ptr(O1, STATE(_oop_temp));

     __ add(STATE(_oop_temp), O1);            // this is really an LEA not an add

     __ bind(not_static);

   }

   // At this point, arguments have been copied off of stack into

   // their JNI positions, which are O1..O5 and SP[68..].

   // Oops are boxed in-place on the stack, with handles copied to arguments.

   // The result handler is in Lscratch.  O0 will shortly hold the JNIEnv*.

 #ifdef ASSERT

   { Label L;

     __ tst(O0);

     __ brx(Assembler::notZero, false, Assembler::pt, L);

     __ delayed()->nop();

     __ stop("native entry point is missing");

     __ bind(L);

   }

 #endif // ASSERT

   //

   // setup the java frame anchor

   //

   // The scavenge function only needs to know that the PC of this frame is

   // in the interpreter method entry code, it doesn't need to know the exact

   // PC and hence we can use O7 which points to the return address from the

   // previous call in the code stream (signature handler function)

   //

   // The other trick is we set last_Java_sp to FP instead of the usual SP because

   // we have pushed the extra frame in order to protect the volatile register(s)

   // in that frame when we return from the jni call

   //

   __ set_last_Java_frame(FP, O7);

   __ mov(O7, I7);  // make dummy interpreter frame look like one above,

                    // not meaningless information that'll confuse me.

   // flush the windows now. We don't care about the current (protection) frame

   // only the outer frames

   __ flush_windows();

   // mark windows as flushed

   Address flags(G2_thread,

                 0,

                 in_bytes(JavaThread::frame_anchor_offset()) + in_bytes(JavaFrameAnchor::flags_offset()));

   __ set(JavaFrameAnchor::flushed, G3_scratch);

   __ st(G3_scratch, flags);

   // Transition from _thread_in_Java to _thread_in_native. We are already safepoint ready.

   Address thread_state(G2_thread, 0, in_bytes(JavaThread::thread_state_offset()));

 #ifdef ASSERT

   { Label L;

     __ ld(thread_state, G3_scratch);

     __ cmp(G3_scratch, _thread_in_Java);

     __ br(Assembler::equal, false, Assembler::pt, L);

     __ delayed()->nop();

     __ stop("Wrong thread state in native stub");

     __ bind(L);

   }

 #endif // ASSERT

   __ set(_thread_in_native, G3_scratch);

   __ st(G3_scratch, thread_state);

   // Call the jni method, using the delay slot to set the JNIEnv* argument.

   __ callr(O0, 0);

   __ delayed()->

      add(G2_thread, in_bytes(JavaThread::jni_environment_offset()), O0);

   __ ld_ptr(STATE(_thread), G2_thread);  // restore thread

   // must we block?

   // Block, if necessary, before resuming in _thread_in_Java state.

   // In order for GC to work, don't clear the last_Java_sp until after blocking.

   { Label no_block;

     Address sync_state(G3_scratch, SafepointSynchronize::address_of_state());

     // Switch thread to "native transition" state before reading the synchronization state.

     // This additional state is necessary because reading and testing the synchronization

     // state is not atomic w.r.t. GC, as this scenario demonstrates:

     //     Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.

     //     VM thread changes sync state to synchronizing and suspends threads for GC.

     //     Thread A is resumed to finish this native method, but doesn't block here since it

     //     didn't see any synchronization is progress, and escapes.

     __ set(_thread_in_native_trans, G3_scratch);

     __ st(G3_scratch, thread_state);

     if(os::is_MP()) {

       // Write serialization page so VM thread can do a pseudo remote membar.

       // We use the current thread pointer to calculate a thread specific

       // offset to write to within the page. This minimizes bus traffic

       // due to cache line collision.

       __ serialize_memory(G2_thread, G1_scratch, G3_scratch);

     }

     __ load_contents(sync_state, G3_scratch);

     __ cmp(G3_scratch, SafepointSynchronize::_not_synchronized);

     Label L;

     Address suspend_state(G2_thread, 0, in_bytes(JavaThread::suspend_flags_offset()));

     __ br(Assembler::notEqual, false, Assembler::pn, L);

     __ delayed()->

       ld(suspend_state, G3_scratch);

     __ cmp(G3_scratch, 0);

     __ br(Assembler::equal, false, Assembler::pt, no_block);

     __ delayed()->nop();

     __ bind(L);

     // Block.  Save any potential method result value before the operation and

     // use a leaf call to leave the last_Java_frame setup undisturbed.

     save_native_result();

     __ call_VM_leaf(noreg,

                     CAST_FROM_FN_PTR(address, JavaThread::check_safepoint_and_suspend_for_native_trans),

                     G2_thread);

     __ ld_ptr(STATE(_thread), G2_thread);  // restore thread

     // Restore any method result value

     restore_native_result();

     __ bind(no_block);

   }

   // Clear the frame anchor now

   __ reset_last_Java_frame();

   // Move the result handler address

   __ mov(Lscratch, G3_scratch);

   // return possible result to the outer frame

 #ifndef __LP64

   __ mov(O0, I0);

   __ restore(O1, G0, O1);

 #else

   __ restore(O0, G0, O0);

 #endif /* __LP64 */

   // Move result handler to expected register

   __ mov(G3_scratch, Lscratch);

   // thread state is thread_in_native_trans. Any safepoint blocking has

   // happened in the trampoline we are ready to switch to thread_in_Java.

   __ set(_thread_in_Java, G3_scratch);

   __ st(G3_scratch, thread_state);

   // If we have an oop result store it where it will be safe for any further gc

   // until we return now that we've released the handle it might be protected by

   {

     Label no_oop, store_result;

     __ set((intptr_t)AbstractInterpreter::result_handler(T_OBJECT), G3_scratch);

     __ cmp(G3_scratch, Lscratch);

     __ brx(Assembler::notEqual, false, Assembler::pt, no_oop);

     __ delayed()->nop();

     __ addcc(G0, O0, O0);

     __ brx(Assembler::notZero, true, Assembler::pt, store_result);     // if result is not NULL:

     __ delayed()->ld_ptr(O0, 0, O0);                                   // unbox it

     __ mov(G0, O0);

     __ bind(store_result);

     // Store it where gc will look for it and result handler expects it.

     __ st_ptr(O0, STATE(_oop_temp));

     __ bind(no_oop);

   }

   // reset handle block

   __ ld_ptr(G2_thread, in_bytes(JavaThread::active_handles_offset()), G3_scratch);

   __ st_ptr(G0, G3_scratch, JNIHandleBlock::top_offset_in_bytes());

   // handle exceptions (exception handling will handle unlocking!)

   { Label L;

     Address exception_addr (G2_thread, 0, in_bytes(Thread::pending_exception_offset()));

     __ ld_ptr(exception_addr, Gtemp);

     __ tst(Gtemp);

     __ brx(Assembler::equal, false, Assembler::pt, L);

     __ delayed()->nop();

     __ bind(pending_exception_present);

     // With c++ interpreter we just leave it pending caller will do the correct thing. However...

     // Like x86 we ignore the result of the native call and leave the method locked. This

     // seems wrong to leave things locked.

     __ br(Assembler::always, false, Assembler::pt, StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);

     __ delayed()->restore(I5_savedSP, G0, SP);  // remove interpreter frame

     __ bind(L);

   }

   // jvmdi/jvmpi support (preserves thread register)

   __ notify_method_exit(true, ilgl, InterpreterMacroAssembler::NotifyJVMTI);

   if (synchronized) {

     // save and restore any potential method result value around the unlocking operation

     save_native_result();

     const int entry_size            = frame::interpreter_frame_monitor_size() * wordSize;

     // Get the initial monitor we allocated

     __ sub(Lstate, entry_size, O1);                        // initial monitor

     __ unlock_object(O1);

     restore_native_result();

   }

 #if defined(COMPILER2) && !defined(_LP64)

   // C2 expects long results in G1 we can't tell if we're returning to interpreted

   // or compiled so just be safe.

   __ sllx(O0, 32, G1);          // Shift bits into high G1

   __ srl (O1, 0, O1);           // Zero extend O1

   __ or3 (O1, G1, G1);          // OR 64 bits into G1

 #endif /* COMPILER2 && !_LP64 */

 #ifdef ASSERT

   {

     Label ok;

     __ cmp(I5_savedSP, FP);

     __ brx(Assembler::greaterEqualUnsigned, false, Assembler::pt, ok);

     __ delayed()->nop();

     __ stop("bad I5_savedSP value");

     __ should_not_reach_here();

     __ bind(ok);

   }

 #endif

   // Calls result handler which POPS FRAME

   if (TraceJumps) {

     // Move target to register that is recordable

     __ mov(Lscratch, G3_scratch);

     __ JMP(G3_scratch, 0);

   } else {

     __ jmp(Lscratch, 0);

   }

   __ delayed()->nop();

   if (inc_counter) {

     // handle invocation counter overflow

     __ bind(invocation_counter_overflow);

     generate_counter_overflow(Lcontinue);

   }

   return entry;

 }

 void CppInterpreterGenerator::generate_compute_interpreter_state(const Register state,

                                                               const Register prev_state,

                                                               bool native) {

   // On entry

   // G5_method - caller's method

   // Gargs - points to initial parameters (i.e. locals[0])

   // G2_thread - valid? (C1 only??)

   // "prev_state" - contains any previous frame manager state which we must save a link

   //

   // On return

   // "state" is a pointer to the newly allocated  state object. We must allocate and initialize

   // a new interpretState object and the method expression stack.

   assert_different_registers(state, prev_state);

   assert_different_registers(prev_state, G3_scratch);

   const Register Gtmp = G3_scratch;

   const Address constants         (G5_method, 0, in_bytes(methodOopDesc::constants_offset()));

   const Address access_flags      (G5_method, 0, in_bytes(methodOopDesc::access_flags_offset()));

   const Address size_of_parameters(G5_method, 0, in_bytes(methodOopDesc::size_of_parameters_offset()));

   const Address max_stack         (G5_method, 0, in_bytes(methodOopDesc::max_stack_offset()));

   const Address size_of_locals    (G5_method, 0, in_bytes(methodOopDesc::size_of_locals_offset()));

   // slop factor is two extra slots on the expression stack so that

   // we always have room to store a result when returning from a call without parameters

   // that returns a result.

   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

   // XXX G5_method valid

   // Now compute new frame size

   if (native) {

     __ lduh( size_of_parameters, Gtmp );

     __ calc_mem_param_words(Gtmp, Gtmp);     // space for native call parameters passed on the stack in words

   } else {

     __ lduh(max_stack, Gtmp);                // Full size expression stack

   }

   __ add(Gtmp, fixed_size, Gtmp);           // plus the fixed portion

   __ neg(Gtmp);                               // negative space for stack/parameters in words

   __ and3(Gtmp, -WordsPerLong, Gtmp);        // make multiple of 2 (SP must be 2-word aligned)

   __ sll(Gtmp, LogBytesPerWord, Gtmp);       // negative space for frame in bytes

   // Need to do stack size check here before we fault on large frames

   Label stack_ok;

   const int max_pages = StackShadowPages > (StackRedPages+StackYellowPages) ? StackShadowPages :

                                                                               (StackRedPages+StackYellowPages);

   __ ld_ptr(G2_thread, in_bytes(Thread::stack_base_offset()), O0);

   __ ld_ptr(G2_thread, in_bytes(Thread::stack_size_offset()), O1);

   // compute stack bottom

   __ sub(O0, O1, O0);

   // Avoid touching the guard pages

   // Also a fudge for frame size of BytecodeInterpreter::run

   // It varies from 1k->4k depending on build type

   const int fudge = 6 * K;

   __ set(fudge + (max_pages * os::vm_page_size()), O1);

   __ add(O0, O1, O0);

   __ sub(O0, Gtmp, O0);

   __ cmp(SP, O0);

   __ brx(Assembler::greaterUnsigned, false, Assembler::pt, stack_ok);

   __ delayed()->nop();

      // throw exception return address becomes throwing pc

   __ call_VM(Oexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));

   __ stop("never reached");

   __ bind(stack_ok);

   __ save(SP, Gtmp, SP);                      // setup new frame and register window

   // New window I7 call_stub or previous activation

   // O6 - register save area, BytecodeInterpreter just below it, args/locals just above that

   //

   __ sub(FP, sizeof(BytecodeInterpreter), state);        // Point to new Interpreter state

   __ add(state, STACK_BIAS, state );         // Account for 64bit bias

 #define XXX_STATE(field_name) state, in_bytes(byte_offset_of(BytecodeInterpreter, field_name))

   // Initialize a new Interpreter state

   // orig_sp - caller's original sp

   // G2_thread - thread

   // Gargs - &locals[0] (unbiased?)

   // G5_method - method

   // SP (biased) - accounts for full size java stack, BytecodeInterpreter object, register save area, and register parameter save window

   __ set(0xdead0004, O1);

   __ st_ptr(Gargs, XXX_STATE(_locals));

   __ st_ptr(G0, XXX_STATE(_oop_temp));

   __ st_ptr(state, XXX_STATE(_self_link));                // point to self

   __ st_ptr(prev_state->after_save(), XXX_STATE(_prev_link)); // Chain interpreter states

   __ st_ptr(G2_thread, XXX_STATE(_thread));               // Store javathread

   if (native) {

     __ st_ptr(G0, XXX_STATE(_bcp));

   } else {

     __ ld_ptr(G5_method, in_bytes(methodOopDesc::const_offset()), O2); // get constMethodOop

     __ add(O2, in_bytes(constMethodOopDesc::codes_offset()), O2);        // get bcp

     __ st_ptr(O2, XXX_STATE(_bcp));

   }

   __ st_ptr(G0, XXX_STATE(_mdx));

   __ st_ptr(G5_method, XXX_STATE(_method));

   __ set((int) BytecodeInterpreter::method_entry, O1);

   __ st(O1, XXX_STATE(_msg));

   __ ld_ptr(constants, O3);

   __ ld_ptr(O3, constantPoolOopDesc::cache_offset_in_bytes(), O2);

   __ st_ptr(O2, XXX_STATE(_constants));

   __ st_ptr(G0, XXX_STATE(_result._to_call._callee));

   // Monitor base is just start of BytecodeInterpreter object;

   __ mov(state, O2);

   __ st_ptr(O2, XXX_STATE(_monitor_base));

   // Do we need a monitor for synchonized method?

   {

     __ ld(access_flags, O1);

     Label done;

     Label got_obj;

     __ btst(JVM_ACC_SYNCHRONIZED, O1);

     __ br( Assembler::zero, false, Assembler::pt, done);

     const int mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();

     __ delayed()->btst(JVM_ACC_STATIC, O1);

     __ ld_ptr(XXX_STATE(_locals), O1);

     __ br( Assembler::zero, true, Assembler::pt, got_obj);

     __ delayed()->ld_ptr(O1, 0, O1);                  // get receiver for not-static case

     __ ld_ptr(constants, O1);

     __ ld_ptr( O1, constantPoolOopDesc::pool_holder_offset_in_bytes(), O1);

     // lock the mirror, not the klassOop

     __ ld_ptr( O1, mirror_offset, O1);

     __ bind(got_obj);

   #ifdef ASSERT

     __ tst(O1);

     __ breakpoint_trap(Assembler::zero);

   #endif // ASSERT

     const int entry_size            = frame::interpreter_frame_monitor_size() * wordSize;

     __ sub(SP, entry_size, SP);                         // account for initial monitor

     __ sub(O2, entry_size, O2);                        // initial monitor

     __ st_ptr(O1, O2, BasicObjectLock::obj_offset_in_bytes()); // and allocate it for interpreter use

     __ bind(done);

   }

   // Remember initial frame bottom

   __ st_ptr(SP, XXX_STATE(_frame_bottom));

   __ st_ptr(O2, XXX_STATE(_stack_base));

   __ sub(O2, wordSize, O2);                    // prepush

   __ st_ptr(O2, XXX_STATE(_stack));                // PREPUSH

   __ lduh(max_stack, O3);                      // Full size expression stack

   guarantee(!EnableInvokeDynamic, "no support yet for java.lang.invoke.MethodHandle"); //6815692

   //6815692//if (EnableInvokeDynamic)

   //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

   __ st_ptr(O3, XXX_STATE(_stack_limit));

   if (!native) {

     //

     // Code to initialize locals

     //

     Register init_value = noreg;    // will be G0 if we must clear locals

     // Now zero locals

     if (true /* zerolocals */ || ClearInterpreterLocals) {

       // explicitly initialize locals

       init_value = G0;

     } else {

     #ifdef ASSERT

       // initialize locals to a garbage pattern for better debugging

       init_value = O3;

       __ set( 0x0F0F0F0F, init_value );

     #endif // ASSERT

     }

     if (init_value != noreg) {

       Label clear_loop;

       // NOTE: If you change the frame layout, this code will need to

       // be updated!

       __ lduh( size_of_locals, O2 );

       __ lduh( size_of_parameters, O1 );

       __ sll( O2, LogBytesPerWord, O2);

       __ sll( O1, LogBytesPerWord, O1 );

       __ ld_ptr(XXX_STATE(_locals), L2_scratch);

       __ sub( L2_scratch, O2, O2 );

       __ sub( L2_scratch, O1, O1 );

       __ bind( clear_loop );

       __ inc( O2, wordSize );

       __ cmp( O2, O1 );

       __ br( Assembler::lessEqualUnsigned, true, Assembler::pt, clear_loop );

       __ delayed()->st_ptr( init_value, O2, 0 );

     }

   }

 }

 // Find preallocated  monitor and lock method (C++ interpreter)

 //

 void InterpreterGenerator::lock_method(void) {

 // Lock the current method.

 // Destroys registers L2_scratch, L3_scratch, O0

 //

 // Find everything relative to Lstate

 #ifdef ASSERT

   __ ld_ptr(STATE(_method), L2_scratch);

   __ ld(L2_scratch, in_bytes(methodOopDesc::access_flags_offset()), O0);

  { Label ok;

    __ btst(JVM_ACC_SYNCHRONIZED, O0);

    __ br( Assembler::notZero, false, Assembler::pt, ok);

    __ delayed()->nop();

    __ stop("method doesn't need synchronization");

    __ bind(ok);

   }

 #endif // ASSERT

   // monitor is already allocated at stack base

   // and the lockee is already present

   __ ld_ptr(STATE(_stack_base), L2_scratch);

   __ ld_ptr(L2_scratch, BasicObjectLock::obj_offset_in_bytes(), O0);   // get object

   __ lock_object(L2_scratch, O0);

 }

 //  Generate code for handling resuming a deopted method

 void CppInterpreterGenerator::generate_deopt_handling() {

   Label return_from_deopt_common;

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_atos  = __ pc();

   // O0/O1 live

   __ ba(false, return_from_deopt_common);

   __ delayed()->set(AbstractInterpreter::BasicType_as_index(T_OBJECT), L3_scratch);    // Result stub address array index

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_btos  = __ pc();

   // O0/O1 live

   __ ba(false, return_from_deopt_common);

   __ delayed()->set(AbstractInterpreter::BasicType_as_index(T_BOOLEAN), L3_scratch);    // Result stub address array index

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_itos  = __ pc();

   // O0/O1 live

   __ ba(false, return_from_deopt_common);

   __ delayed()->set(AbstractInterpreter::BasicType_as_index(T_INT), L3_scratch);    // Result stub address array index

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_ltos  = __ pc();

 #if !defined(_LP64) && defined(COMPILER2)

   // All return values are where we want them, except for Longs.  C2 returns

   // longs in G1 in the 32-bit build whereas the interpreter wants them in O0/O1.

   // Since the interpreter will return longs in G1 and O0/O1 in the 32bit

   // build even if we are returning from interpreted we just do a little

   // stupid shuffing.

   // Note: I tried to make c2 return longs in O0/O1 and G1 so we wouldn't have to

   // do this here. Unfortunately if we did a rethrow we'd see an machepilog node

   // first which would move g1 -> O0/O1 and destroy the exception we were throwing.

   __ srl (G1, 0,O1);

   __ srlx(G1,32,O0);

 #endif /* !_LP64 && COMPILER2 */

   // O0/O1 live

   __ ba(false, return_from_deopt_common);

   __ delayed()->set(AbstractInterpreter::BasicType_as_index(T_LONG), L3_scratch);    // Result stub address array index

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_ftos  = __ pc();

   // O0/O1 live

   __ ba(false, return_from_deopt_common);

   __ delayed()->set(AbstractInterpreter::BasicType_as_index(T_FLOAT), L3_scratch);    // Result stub address array index

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_dtos  = __ pc();

   // O0/O1 live

   __ ba(false, return_from_deopt_common);

   __ delayed()->set(AbstractInterpreter::BasicType_as_index(T_DOUBLE), L3_scratch);    // Result stub address array index

   // deopt needs to jump to here to enter the interpreter (return a result)

   deopt_frame_manager_return_vtos  = __ pc();

   // O0/O1 live

   __ set(AbstractInterpreter::BasicType_as_index(T_VOID), L3_scratch);

   // Deopt return common

   // an index is present that lets us move any possible result being

   // return to the interpreter's stack

   //

   __ bind(return_from_deopt_common);

   // Result if any is in native abi result (O0..O1/F0..F1). The java expression

   // stack is in the state that the  calling convention left it.

   // Copy the result from native abi result and place it on java expression stack.

   // Current interpreter state is present in Lstate

   // Get current pre-pushed top of interpreter stack

   // Any result (if any) is in native abi

   // result type index is in L3_scratch

   __ ld_ptr(STATE(_stack), L1_scratch);                                          // get top of java expr stack

   __ set((intptr_t)CppInterpreter::_tosca_to_stack, L4_scratch);

   __ sll(L3_scratch, LogBytesPerWord, L3_scratch);

   __ ld_ptr(L4_scratch, L3_scratch, Lscratch);                                       // get typed result converter address

   __ jmpl(Lscratch, G0, O7);                                         // and convert it

   __ delayed()->nop();

   // L1_scratch points to top of stack (prepushed)

   __ st_ptr(L1_scratch, STATE(_stack));

 }

 // Generate the code to handle a more_monitors message from the c++ interpreter

 void CppInterpreterGenerator::generate_more_monitors() {

   Label entry, loop;

   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;

   // 1. compute new pointers                                // esp: old expression stack top

   __ delayed()->ld_ptr(STATE(_stack_base), L4_scratch);            // current expression stack bottom

   __ sub(L4_scratch, entry_size, L4_scratch);

   __ st_ptr(L4_scratch, STATE(_stack_base));

   __ sub(SP, entry_size, SP);                  // Grow stack

   __ st_ptr(SP, STATE(_frame_bottom));

   __ ld_ptr(STATE(_stack_limit), L2_scratch);

   __ sub(L2_scratch, entry_size, L2_scratch);

   __ st_ptr(L2_scratch, STATE(_stack_limit));

   __ ld_ptr(STATE(_stack), L1_scratch);                // Get current stack top

   __ sub(L1_scratch, entry_size, L1_scratch);

   __ st_ptr(L1_scratch, STATE(_stack));

   __ ba(false, entry);

   __ delayed()->add(L1_scratch, wordSize, L1_scratch);        // first real entry (undo prepush)

   // 2. move expression stack

   __ bind(loop);

   __ st_ptr(L3_scratch, Address(L1_scratch, 0));

   __ add(L1_scratch, wordSize, L1_scratch);

   __ bind(entry);

   __ cmp(L1_scratch, L4_scratch);

   __ br(Assembler::notEqual, false, Assembler::pt, loop);

   __ delayed()->ld_ptr(L1_scratch, entry_size, L3_scratch);

   // now zero the slot so we can find it.

   __ st_ptr(G0, L4_scratch, BasicObjectLock::obj_offset_in_bytes());

 }

 // Initial entry to C++ interpreter from the call_stub.

 // This entry point is called the frame manager since it handles the generation

 // of interpreter activation frames via requests directly from the vm (via call_stub)

 // and via requests from the interpreter. The requests from the call_stub happen

 // directly thru the entry point. Requests from the interpreter happen via returning

 // from the interpreter and examining the message the interpreter has returned to

 // the frame manager. The frame manager can take the following requests:

 // NO_REQUEST - error, should never happen.

 // MORE_MONITORS - need a new monitor. Shuffle the expression stack on down and

 //                 allocate a new monitor.

 // CALL_METHOD - setup a new activation to call a new method. Very similar to what

 //               happens during entry during the entry via the call stub.

 // RETURN_FROM_METHOD - remove an activation. Return to interpreter or call stub.

 //

 // Arguments:

 //

 // ebx: methodOop

 // ecx: receiver - unused (retrieved from stack as needed)

 // esi: previous frame manager state (NULL from the call_stub/c1/c2)

 //

 //

 // Stack layout at entry

 //

 // [ return address     ] <--- esp

 // [ parameter n        ]

 //   ...

 // [ parameter 1        ]

 // [ expression stack   ]

 //

 //

 // We are free to blow any registers we like because the call_stub which brought us here

 // initially has preserved the callee save registers already.

 //

 //

 static address interpreter_frame_manager = NULL;

 #ifdef ASSERT

   #define VALIDATE_STATE(scratch, marker)                         \

   {                                                               \

     Label skip;                                                   \

     __ ld_ptr(STATE(_self_link), scratch);                        \

     __ cmp(Lstate, scratch);                                      \

     __ brx(Assembler::equal, false, Assembler::pt, skip);         \

     __ delayed()->nop();                                          \

     __ breakpoint_trap();                                         \

     __ emit_long(marker);                                         \

     __ bind(skip);                                                \

   }

 #else

   #define VALIDATE_STATE(scratch, marker)

 #endif /* ASSERT */

 void CppInterpreterGenerator::adjust_callers_stack(Register args) {

 //

 // Adjust caller's stack so that all the locals can be contiguous with

 // the parameters.

 // Worries about stack overflow make this a pain.

 //

 // Destroys args, G3_scratch, G3_scratch

 // In/Out O5_savedSP (sender's original SP)

 //

 //  assert_different_registers(state, prev_state);

   const Register Gtmp = G3_scratch;

   const Register tmp = O2;

   const Address size_of_parameters(G5_method, 0, in_bytes(methodOopDesc::size_of_parameters_offset()));

   const Address size_of_locals    (G5_method, 0, in_bytes(methodOopDesc::size_of_locals_offset()));

   __ lduh(size_of_parameters, tmp);

   __ sll(tmp, LogBytesPerWord, Gtmp);       // parameter size in bytes

   __ add(args, Gtmp, Gargs);                // points to first local + BytesPerWord

   // NEW

   __ add(Gargs, -wordSize, Gargs);             // points to first local[0]

   // determine extra space for non-argument locals & adjust caller's SP

   // Gtmp1: parameter size in words

   __ lduh(size_of_locals, Gtmp);

   __ compute_extra_locals_size_in_bytes(tmp, Gtmp, Gtmp);

 #if 1

   // c2i adapters place the final interpreter argument in the register save area for O0/I0

   // the call_stub will place the final interpreter argument at

   // frame::memory_parameter_word_sp_offset. This is mostly not noticable for either asm

   // or c++ interpreter. However with the c++ interpreter when we do a recursive call

   // and try to make it look good in the debugger we will store the argument to

   // RecursiveInterpreterActivation in the register argument save area. Without allocating

   // extra space for the compiler this will overwrite locals in the local array of the

   // interpreter.

   // QQQ still needed with frameless adapters???

   const int c2i_adjust_words = frame::memory_parameter_word_sp_offset - frame::callee_register_argument_save_area_sp_offset;

   __ add(Gtmp, c2i_adjust_words*wordSize, Gtmp);

 #endif // 1

   __ sub(SP, Gtmp, SP);                      // just caller's frame for the additional space we need.

 }

 address InterpreterGenerator::generate_normal_entry(bool synchronized) {

   // G5_method: methodOop

   // G2_thread: thread (unused)

   // Gargs:   bottom of args (sender_sp)

   // O5: sender's sp

   // A single frame manager is plenty as we don't specialize for synchronized. We could and

   // the code is pretty much ready. Would need to change the test below and for good measure

   // modify generate_interpreter_state to only do the (pre) sync stuff stuff for synchronized

   // routines. Not clear this is worth it yet.

   if (interpreter_frame_manager) {

     return interpreter_frame_manager;

   }

   __ bind(frame_manager_entry);

   // the following temporary registers are used during frame creation

   const Register Gtmp1 = G3_scratch;

   // const Register Lmirror = L1;     // native mirror (native calls only)

   const Address constants         (G5_method, 0, in_bytes(methodOopDesc::constants_offset()));

   const Address access_flags      (G5_method, 0, in_bytes(methodOopDesc::access_flags_offset()));

   const Address size_of_parameters(G5_method, 0, in_bytes(methodOopDesc::size_of_parameters_offset()));

   const Address max_stack         (G5_method, 0, in_bytes(methodOopDesc::max_stack_offset()));

   const Address size_of_locals    (G5_method, 0, in_bytes(methodOopDesc::size_of_locals_offset()));

   address entry_point = __ pc();

   __ mov(G0, prevState);                                                 // no current activation

   Label re_dispatch;

   __ bind(re_dispatch);

   // Interpreter needs to have locals completely contiguous. In order to do that

   // We must adjust the caller's stack pointer for any locals beyond just the

   // parameters

   adjust_callers_stack(Gargs);

   // O5_savedSP still contains sender's sp

   // NEW FRAME

   generate_compute_interpreter_state(Lstate, prevState, false);

   // At this point a new interpreter frame and state object are created and initialized

   // Lstate has the pointer to the new activation

   // Any stack banging or limit check should already be done.

   Label call_interpreter;

   __ bind(call_interpreter);

 #if 1

   __ set(0xdead002, Lmirror);

   __ set(0xdead002, L2_scratch);

   __ set(0xdead003, L3_scratch);

   __ set(0xdead004, L4_scratch);

   __ set(0xdead005, Lscratch);

   __ set(0xdead006, Lscratch2);

   __ set(0xdead007, L7_scratch);

   __ set(0xdeaf002, O2);

   __ set(0xdeaf003, O3);

   __ set(0xdeaf004, O4);

   __ set(0xdeaf005, O5);

 #endif

   // Call interpreter (stack bang complete) enter here if message is

   // set and we know stack size is valid

   Label call_interpreter_2;

   __ bind(call_interpreter_2);

 #ifdef ASSERT

   {

     Label skip;

     __ ld_ptr(STATE(_frame_bottom), G3_scratch);

     __ cmp(G3_scratch, SP);

     __ brx(Assembler::equal, false, Assembler::pt, skip);

     __ delayed()->nop();

     __ stop("SP not restored to frame bottom");

     __ bind(skip);

   }

 #endif

   VALIDATE_STATE(G3_scratch, 4);

   __ set_last_Java_frame(SP, noreg);

   __ mov(Lstate, O0);                 // (arg) pointer to current state

   __ call(CAST_FROM_FN_PTR(address,

                            JvmtiExport::can_post_interpreter_events() ?

                                                                   BytecodeInterpreter::runWithChecks

                                                                 : BytecodeInterpreter::run),

          relocInfo::runtime_call_type);

   __ delayed()->nop();

   __ ld_ptr(STATE(_thread), G2_thread);

   __ reset_last_Java_frame();

   // examine msg from interpreter to determine next action

   __ ld_ptr(STATE(_thread), G2_thread);                                  // restore G2_thread

   __ ld(STATE(_msg), L1_scratch);                                       // Get new message

   Label call_method;

   Label return_from_interpreted_method;

   Label throw_exception;

   Label do_OSR;

   Label bad_msg;

   Label resume_interpreter;

   __ cmp(L1_scratch, (int)BytecodeInterpreter::call_method);

   __ br(Assembler::equal, false, Assembler::pt, call_method);

   __ delayed()->cmp(L1_scratch, (int)BytecodeInterpreter::return_from_method);

   __ br(Assembler::equal, false, Assembler::pt, return_from_interpreted_method);

   __ delayed()->cmp(L1_scratch, (int)BytecodeInterpreter::throwing_exception);

   __ br(Assembler::equal, false, Assembler::pt, throw_exception);

   __ delayed()->cmp(L1_scratch, (int)BytecodeInterpreter::do_osr);

   __ br(Assembler::equal, false, Assembler::pt, do_OSR);

   __ delayed()->cmp(L1_scratch, (int)BytecodeInterpreter::more_monitors);

   __ br(Assembler::notEqual, false, Assembler::pt, bad_msg);

   // Allocate more monitor space, shuffle expression stack....

   generate_more_monitors();

   // new monitor slot allocated, resume the interpreter.

   __ set((int)BytecodeInterpreter::got_monitors, L1_scratch);

   VALIDATE_STATE(G3_scratch, 5);

   __ ba(false, call_interpreter);

   __ delayed()->st(L1_scratch, STATE(_msg));

   // uncommon trap needs to jump to here to enter the interpreter (re-execute current bytecode)

   unctrap_frame_manager_entry  = __ pc();

   // QQQ what message do we send

   __ ba(false, call_interpreter);

   __ delayed()->ld_ptr(STATE(_frame_bottom), SP);                  // restore to full stack frame

   //=============================================================================

   // Returning from a compiled method into a deopted method. The bytecode at the

   // bcp has completed. The result of the bytecode is in the native abi (the tosca

   // for the template based interpreter). Any stack space that was used by the

   // bytecode that has completed has been removed (e.g. parameters for an invoke)

   // so all that we have to do is place any pending result on the expression stack

   // and resume execution on the next bytecode.

   generate_deopt_handling();

   // ready to resume the interpreter

   __ set((int)BytecodeInterpreter::deopt_resume, L1_scratch);

   __ ba(false, call_interpreter);

   __ delayed()->st(L1_scratch, STATE(_msg));

   // Current frame has caught an exception we need to dispatch to the

   // handler. We can get here because a native interpreter frame caught

   // an exception in which case there is no handler and we must rethrow

   // If it is a vanilla interpreted frame the we simply drop into the

   // interpreter and let it do the lookup.

   Interpreter::_rethrow_exception_entry = __ pc();

   Label return_with_exception;

   Label unwind_and_forward;

   // O0: exception

   // O7: throwing pc

   // We want exception in the thread no matter what we ultimately decide about frame type.

   Address exception_addr (G2_thread, 0, in_bytes(Thread::pending_exception_offset()));

   __ verify_thread();

   __ st_ptr(O0, exception_addr);

   // get the methodOop

   __ ld_ptr(STATE(_method), G5_method);

   // if this current frame vanilla or native?

   __ ld(access_flags, Gtmp1);

   __ btst(JVM_ACC_NATIVE, Gtmp1);

   __ br(Assembler::zero, false, Assembler::pt, return_with_exception);  // vanilla interpreted frame handle directly

   __ delayed()->nop();

   // We drop thru to unwind a native interpreted frame with a pending exception

   // We jump here for the initial interpreter frame with exception pending

   // We unwind the current acivation and forward it to our caller.

   __ bind(unwind_and_forward);

   // Unwind frame and jump to forward exception. unwinding will place throwing pc in O7

   // as expected by forward_exception.

   __ restore(FP, G0, SP);                  // unwind interpreter state frame

   __ br(Assembler::always, false, Assembler::pt, StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);

   __ delayed()->mov(I5_savedSP->after_restore(), SP);

   // Return point from a call which returns a result in the native abi

   // (c1/c2/jni-native). This result must be processed onto the java

   // expression stack.

   //

   // A pending exception may be present in which case there is no result present

   address return_from_native_method = __ pc();

   VALIDATE_STATE(G3_scratch, 6);

   // Result if any is in native abi result (O0..O1/F0..F1). The java expression

   // stack is in the state that the  calling convention left it.

   // Copy the result from native abi result and place it on java expression stack.

   // Current interpreter state is present in Lstate

   // Exception pending?

   __ ld_ptr(STATE(_frame_bottom), SP);                             // restore to full stack frame

   __ ld_ptr(exception_addr, Lscratch);                                         // get any pending exception

   __ tst(Lscratch);                                                            // exception pending?

   __ brx(Assembler::notZero, false, Assembler::pt, return_with_exception);

   __ delayed()->nop();

   // Process the native abi result to java expression stack

   __ ld_ptr(STATE(_result._to_call._callee), L4_scratch);                        // called method

   __ ld_ptr(STATE(_stack), L1_scratch);                                          // get top of java expr stack

   __ lduh(L4_scratch, in_bytes(methodOopDesc::size_of_parameters_offset()), L2_scratch); // get parameter size

   __ sll(L2_scratch, LogBytesPerWord, L2_scratch     );                           // parameter size in bytes

   __ add(L1_scratch, L2_scratch, L1_scratch);                                      // stack destination for result

   __ ld(L4_scratch, in_bytes(methodOopDesc::result_index_offset()), L3_scratch); // called method result type index

   // tosca is really just native abi

   __ set((intptr_t)CppInterpreter::_tosca_to_stack, L4_scratch);

   __ sll(L3_scratch, LogBytesPerWord, L3_scratch);

   __ ld_ptr(L4_scratch, L3_scratch, Lscratch);                                       // get typed result converter address

   __ jmpl(Lscratch, G0, O7);                                                   // and convert it

   __ delayed()->nop();

   // L1_scratch points to top of stack (prepushed)

   __ ba(false, resume_interpreter);

   __ delayed()->mov(L1_scratch, O1);

   // An exception is being caught on return to a vanilla interpreter frame.

   // Empty the stack and resume interpreter

   __ bind(return_with_exception);

   __ ld_ptr(STATE(_frame_bottom), SP);                             // restore to full stack frame

   __ ld_ptr(STATE(_stack_base), O1);                               // empty java expression stack

   __ ba(false, resume_interpreter);

   __ delayed()->sub(O1, wordSize, O1);                             // account for prepush

   // Return from interpreted method we return result appropriate to the caller (i.e. "recursive"

   // interpreter call, or native) and unwind this interpreter activation.

   // All monitors should be unlocked.

   __ bind(return_from_interpreted_method);

   VALIDATE_STATE(G3_scratch, 7);

   Label return_to_initial_caller;

   // Interpreted result is on the top of the completed activation expression stack.

   // We must return it to the top of the callers stack if caller was interpreted

   // otherwise we convert to native abi result and return to call_stub/c1/c2

   // The caller's expression stack was truncated by the call however the current activation

   // has enough stuff on the stack that we have usable space there no matter what. The

   // other thing that makes it easy is that the top of the caller's stack is stored in STATE(_locals)

   // for the current activation

   __ ld_ptr(STATE(_prev_link), L1_scratch);

   __ ld_ptr(STATE(_method), L2_scratch);                               // get method just executed

   __ ld(L2_scratch, in_bytes(methodOopDesc::result_index_offset()), L2_scratch);

   __ tst(L1_scratch);

   __ brx(Assembler::zero, false, Assembler::pt, return_to_initial_caller);

   __ delayed()->sll(L2_scratch, LogBytesPerWord, L2_scratch);

   // Copy result to callers java stack

   __ set((intptr_t)CppInterpreter::_stack_to_stack, L4_scratch);

   __ ld_ptr(L4_scratch, L2_scratch, Lscratch);                          // get typed result converter address

   __ ld_ptr(STATE(_stack), O0);                                       // current top (prepushed)

   __ ld_ptr(STATE(_locals), O1);                                      // stack destination

   // O0 - will be source, O1 - will be destination (preserved)

   __ jmpl(Lscratch, G0, O7);                                          // and convert it

   __ delayed()->add(O0, wordSize, O0);                                // get source (top of current expr stack)

   // O1 == &locals[0]

   // Result is now on caller's stack. Just unwind current activation and resume

   Label unwind_recursive_activation;

   __ bind(unwind_recursive_activation);

   // O1 == &locals[0] (really callers stacktop) for activation now returning

   // returning to interpreter method from "recursive" interpreter call

   // result converter left O1 pointing to top of the( prepushed) java stack for method we are returning

   // to. Now all we must do is unwind the state from the completed call

   // Must restore stack

   VALIDATE_STATE(G3_scratch, 8);

   // Return to interpreter method after a method call (interpreted/native/c1/c2) has completed.

   // Result if any is already on the caller's stack. All we must do now is remove the now dead

   // frame and tell interpreter to resume.

   __ mov(O1, I1);                                                     // pass back new stack top across activation

   // POP FRAME HERE ==================================

   __ restore(FP, G0, SP);                                             // unwind interpreter state frame

   __ ld_ptr(STATE(_frame_bottom), SP);                                // restore to full stack frame

   // Resume the interpreter. The current frame contains the current interpreter

   // state object.

   //

   // O1 == new java stack pointer

   __ bind(resume_interpreter);

   VALIDATE_STATE(G3_scratch, 10);

   // A frame we have already used before so no need to bang stack so use call_interpreter_2 entry

   __ set((int)BytecodeInterpreter::method_resume, L1_scratch);

   __ st(L1_scratch, STATE(_msg));

   __ ba(false, call_interpreter_2);

   __ delayed()->st_ptr(O1, STATE(_stack));

   // Fast accessor methods share this entry point.

   // This works because frame manager is in the same codelet

   // This can either be an entry via call_stub/c1/c2 or a recursive interpreter call

   // we need to do a little register fixup here once we distinguish the two of them

   if (UseFastAccessorMethods && !synchronized) {

   // Call stub_return address still in O7

     __ bind(fast_accessor_slow_entry_path);

     __ set((intptr_t)return_from_native_method - 8, Gtmp1);

     __ cmp(Gtmp1, O7);                                                // returning to interpreter?

     __ brx(Assembler::equal, true, Assembler::pt, re_dispatch);       // yep

     __ delayed()->nop();

     __ ba(false, re_dispatch);

     __ delayed()->mov(G0, prevState);                                   // initial entry

   }

   // interpreter returning to native code (call_stub/c1/c2)

   // convert result and unwind initial activation

   // L2_scratch - scaled result type index

   __ bind(return_to_initial_caller);

   __ set((intptr_t)CppInterpreter::_stack_to_native_abi, L4_scratch);

   __ ld_ptr(L4_scratch, L2_scratch, Lscratch);                           // get typed result converter address

   __ ld_ptr(STATE(_stack), O0);                                        // current top (prepushed)

   __ jmpl(Lscratch, G0, O7);                                           // and convert it

   __ delayed()->add(O0, wordSize, O0);                                 // get source (top of current expr stack)

   Label unwind_initial_activation;

   __ bind(unwind_initial_activation);

   // RETURN TO CALL_STUB/C1/C2 code (result if any in I0..I1/(F0/..F1)

   // we can return here with an exception that wasn't handled by interpreted code

   // how does c1/c2 see it on return?

   // compute resulting sp before/after args popped depending upon calling convention

   // __ ld_ptr(STATE(_saved_sp), Gtmp1);

   //

   // POP FRAME HERE ==================================

   __ restore(FP, G0, SP);

   __ retl();

   __ delayed()->mov(I5_savedSP->after_restore(), SP);

   // OSR request, unwind the current frame and transfer to the OSR entry

   // and enter OSR nmethod

   __ bind(do_OSR);

   Label remove_initial_frame;

   __ ld_ptr(STATE(_prev_link), L1_scratch);

   __ ld_ptr(STATE(_result._osr._osr_buf), G1_scratch);

   // We are going to pop this frame. Is there another interpreter frame underneath

   // it or is it callstub/compiled?

   __ tst(L1_scratch);

   __ brx(Assembler::zero, false, Assembler::pt, remove_initial_frame);

   __ delayed()->ld_ptr(STATE(_result._osr._osr_entry), G3_scratch);

   // Frame underneath is an interpreter frame simply unwind

   // POP FRAME HERE ==================================

   __ restore(FP, G0, SP);                                             // unwind interpreter state frame

   __ mov(I5_savedSP->after_restore(), SP);

   // Since we are now calling native need to change our "return address" from the

   // dummy RecursiveInterpreterActivation to a return from native

   __ set((intptr_t)return_from_native_method - 8, O7);

   __ jmpl(G3_scratch, G0, G0);

   __ delayed()->mov(G1_scratch, O0);

   __ bind(remove_initial_frame);

   // POP FRAME HERE ==================================

   __ restore(FP, G0, SP);

   __ mov(I5_savedSP->after_restore(), SP);

   __ jmpl(G3_scratch, G0, G0);

   __ delayed()->mov(G1_scratch, O0);

   // Call a new method. All we do is (temporarily) trim the expression stack

   // push a return address to bring us back to here and leap to the new entry.

   // At this point we have a topmost frame that was allocated by the frame manager

   // which contains the current method interpreted state. We trim this frame

   // of excess java expression stack entries and then recurse.

   __ bind(call_method);

   // stack points to next free location and not top element on expression stack

   // method expects sp to be pointing to topmost element

   __ ld_ptr(STATE(_thread), G2_thread);

   __ ld_ptr(STATE(_result._to_call._callee), G5_method);

   // SP already takes in to account the 2 extra words we use for slop

   // when we call a "static long no_params()" method. So if

   // we trim back sp by the amount of unused java expression stack

   // there will be automagically the 2 extra words we need.

   // We also have to worry about keeping SP aligned.

   __ ld_ptr(STATE(_stack), Gargs);

   __ ld_ptr(STATE(_stack_limit), L1_scratch);

   // compute the unused java stack size

   __ sub(Gargs, L1_scratch, L2_scratch);                       // compute unused space

   // Round down the unused space to that stack is always 16-byte aligned

   // by making the unused space a multiple of the size of two longs.

   __ and3(L2_scratch, -2*BytesPerLong, L2_scratch);

   // Now trim the stack

   __ add(SP, L2_scratch, SP);

   // Now point to the final argument (account for prepush)

   __ add(Gargs, wordSize, Gargs);

 #ifdef ASSERT

   // Make sure we have space for the window

   __ sub(Gargs, SP, L1_scratch);

   __ cmp(L1_scratch, 16*wordSize);

   {

     Label skip;

     __ brx(Assembler::greaterEqual, false, Assembler::pt, skip);

     __ delayed()->nop();

     __ stop("killed stack");

     __ bind(skip);

   }

 #endif // ASSERT

   // Create a new frame where we can store values that make it look like the interpreter

   // really recursed.

   // prepare to recurse or call specialized entry

   // First link the registers we need

   // make the pc look good in debugger

   __ set(CAST_FROM_FN_PTR(intptr_t, RecursiveInterpreterActivation), O7);

   // argument too

   __ mov(Lstate, I0);

   // Record our sending SP

   __ mov(SP, O5_savedSP);

   __ ld_ptr(STATE(_result._to_call._callee_entry_point), L2_scratch);

   __ set((intptr_t) entry_point, L1_scratch);

   __ cmp(L1_scratch, L2_scratch);

   __ brx(Assembler::equal, false, Assembler::pt, re_dispatch);

   __ delayed()->mov(Lstate, prevState);                                // link activations

   // method uses specialized entry, push a return so we look like call stub setup

   // this path will handle fact that result is returned in registers and not

   // on the java stack.

   __ set((intptr_t)return_from_native_method - 8, O7);

   __ jmpl(L2_scratch, G0, G0);                               // Do specialized entry

   __ delayed()->nop();

   //

   // Bad Message from interpreter

   //

   __ bind(bad_msg);

   __ stop("Bad message from interpreter");

   // Interpreted method "returned" with an exception pass it on...

   // Pass result, unwind activation and continue/return to interpreter/call_stub

   // We handle result (if any) differently based on return to interpreter or call_stub

   __ bind(throw_exception);

   __ ld_ptr(STATE(_prev_link), L1_scratch);

   __ tst(L1_scratch);

   __ brx(Assembler::zero, false, Assembler::pt, unwind_and_forward);

   __ delayed()->nop();

   __ ld_ptr(STATE(_locals), O1);                                   // get result of popping callee's args

   __ ba(false, unwind_recursive_activation);

   __ delayed()->nop();

   interpreter_frame_manager = entry_point;

   return entry_point;

 }

 InterpreterGenerator::InterpreterGenerator(StubQueue* code)

  : CppInterpreterGenerator(code) {

    generate_all(); // down here so it can be "virtual"

 }

 static int size_activation_helper(int callee_extra_locals, int max_stack, int monitor_size) {

   // Figure out the size of an interpreter frame (in words) given that we have a fully allocated

   // expression stack, the callee will have callee_extra_locals (so we can account for

   // frame extension) and monitor_size for monitors. Basically we need to calculate

   // this exactly like generate_fixed_frame/generate_compute_interpreter_state.

   //

   //

   // The big complicating thing here is that we must ensure that the stack stays properly

   // aligned. This would be even uglier if monitor size wasn't modulo what the stack

   // needs to be aligned for). We are given that the sp (fp) is already aligned by

   // the caller so we must ensure that it is properly aligned for our callee.

   //

   // Ths c++ interpreter always makes sure that we have a enough extra space on the

   // stack at all times to deal with the "stack long no_params()" method issue. This

   // is "slop_factor" here.

   const int slop_factor = 2;

   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 +

                    (callee_extra_locals * Interpreter::stackElementWords()), WordsPerLong));

 }

 int AbstractInterpreter::size_top_interpreter_activation(methodOop method) {

   // See call_stub code

   int call_stub_size  = round_to(7 + frame::memory_parameter_word_sp_offset,

                                  WordsPerLong);    // 7 + register save area

   // Save space for one monitor to get into the interpreted method in case

   // the method is synchronized

   int monitor_size    = method->is_synchronized() ?

                                 1*frame::interpreter_frame_monitor_size() : 0;

   return size_activation_helper(method->max_locals(), method->max_stack(),

                                  monitor_size) + call_stub_size;

 }

 void BytecodeInterpreter::layout_interpreterState(interpreterState to_fill,

                                            frame* caller,

                                            frame* current,

                                            methodOop method,

                                            intptr_t* locals,

                                            intptr_t* stack,

                                            intptr_t* stack_base,

                                            intptr_t* monitor_base,

                                            intptr_t* frame_bottom,

                                            bool is_top_frame

                                            )

 {

   // What about any vtable?

   //

   to_fill->_thread = JavaThread::current();

   // This gets filled in later but make it something recognizable for now

   to_fill->_bcp = method->code_base();

   to_fill->_locals = locals;

   to_fill->_constants = method->constants()->cache();

   to_fill->_method = method;

   to_fill->_mdx = NULL;

   to_fill->_stack = stack;

   if (is_top_frame && JavaThread::current()->popframe_forcing_deopt_reexecution() ) {

     to_fill->_msg = deopt_resume2;

   } else {

     to_fill->_msg = method_resume;

   }

   to_fill->_result._to_call._bcp_advance = 0;

   to_fill->_result._to_call._callee_entry_point = NULL; // doesn't matter to anyone

   to_fill->_result._to_call._callee = NULL; // doesn't matter to anyone

   to_fill->_prev_link = NULL;

   // Fill in the registers for the frame

   // Need to install _sender_sp. Actually not too hard in C++!

   // When the skeletal frames are layed out we fill in a value

   // for _sender_sp. That value is only correct for the oldest

   // skeletal frame constructed (because there is only a single

   // entry for "caller_adjustment". While the skeletal frames

   // exist that is good enough. We correct that calculation

   // here and get all the frames correct.

   // to_fill->_sender_sp = locals - (method->size_of_parameters() - 1);

   *current->register_addr(Lstate) = (intptr_t) to_fill;

   // skeletal already places a useful value here and this doesn't account

   // for alignment so don't bother.

   // *current->register_addr(I5_savedSP) =     (intptr_t) locals - (method->size_of_parameters() - 1);

   if (caller->is_interpreted_frame()) {

     interpreterState prev  = caller->get_interpreterState();

     to_fill->_prev_link = prev;

     // Make the prev callee look proper

     prev->_result._to_call._callee = method;

     if (*prev->_bcp == Bytecodes::_invokeinterface) {

       prev->_result._to_call._bcp_advance = 5;

     } else {

       prev->_result._to_call._bcp_advance = 3;

     }

   }

   to_fill->_oop_temp = NULL;

   to_fill->_stack_base = stack_base;

   // 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.

   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

   to_fill->_frame_bottom = frame_bottom;

   to_fill->_self_link = to_fill;

 #ifdef ASSERT

   to_fill->_native_fresult = 123456.789;

   to_fill->_native_lresult = CONST64(0xdeadcafedeafcafe);

 #endif

 }

 void BytecodeInterpreter::pd_layout_interpreterState(interpreterState istate, address last_Java_pc, intptr_t* last_Java_fp) {

   istate->_last_Java_pc = (intptr_t*) last_Java_pc;

 }

 int AbstractInterpreter::layout_activation(methodOop method,

                                            int tempcount, // Number of slots on java expression stack in use

                                            int popframe_extra_args,

                                            int moncount,  // Number of active monitors

                                            int callee_param_size,

                                            int callee_locals_size,

                                            frame* caller,

                                            frame* interpreter_frame,

                                            bool is_top_frame) {

   assert(popframe_extra_args == 0, "NEED TO FIX");

   // NOTE this code must exactly mimic what InterpreterGenerator::generate_compute_interpreter_state()

   // does as far as allocating an interpreter frame.

   // If interpreter_frame!=NULL, set up the method, locals, and monitors.

   // The frame interpreter_frame, if not NULL, is guaranteed to be the right size,

   // as determined by a previous call to this method.

   // It is also guaranteed to be walkable even though it is in a skeletal state

   // NOTE: return size is in words not bytes

   // NOTE: tempcount is the current size of the java expression stack. For top most

   //       frames we will allocate a full sized expression stack and not the curback

   //       version that non-top frames have.

   // Calculate the amount our frame will be adjust by the callee. For top frame

   // this is zero.

   // NOTE: ia64 seems to do this wrong (or at least backwards) in that it

   // calculates the extra locals based on itself. Not what the callee does

   // to it. So it ignores last_frame_adjust value. Seems suspicious as far

   // as getting sender_sp correct.

   int extra_locals_size = callee_locals_size - callee_param_size;

   int monitor_size = (sizeof(BasicObjectLock) * moncount) / wordSize;

   int full_frame_words = size_activation_helper(extra_locals_size, method->max_stack(), monitor_size);

   int short_frame_words = size_activation_helper(extra_locals_size, method->max_stack(), monitor_size);

   int frame_words = is_top_frame ? full_frame_words : short_frame_words;

   /*

     if we actually have a frame to layout we must now fill in all the pieces. This means both

     the interpreterState and the registers.

   */

   if (interpreter_frame != NULL) {

     // MUCHO HACK

     intptr_t* frame_bottom = interpreter_frame->sp() - (full_frame_words - frame_words);

     // 'interpreter_frame->sp()' is unbiased while 'frame_bottom' must be a biased value in 64bit mode.

     assert(((intptr_t)frame_bottom & 0xf) == 0, "SP biased in layout_activation");

     frame_bottom = (intptr_t*)((intptr_t)frame_bottom - STACK_BIAS);

     /* Now fillin the interpreterState object */

     interpreterState cur_state = (interpreterState) ((intptr_t)interpreter_frame->fp() -  sizeof(BytecodeInterpreter));

     intptr_t* locals;

     // Calculate the postion of locals[0]. This is painful because of

     // stack alignment (same as ia64). The problem is that we can

     // not compute the location of locals from fp(). fp() will account

     // for the extra locals but it also accounts for aligning the stack

     // and we can't determine if the locals[0] was misaligned but max_locals

     // was enough to have the

     // calculate postion of locals. fp already accounts for extra locals.

     // +2 for the static long no_params() issue.

     if (caller->is_interpreted_frame()) {

       // locals must agree with the caller because it will be used to set the

       // caller's tos when we return.

       interpreterState prev  = caller->get_interpreterState();

       // stack() is prepushed.

       locals = prev->stack() + method->size_of_parameters();

     } else {

       // Lay out locals block in the caller adjacent to the register window save area.

       //

       // Compiled frames do not allocate a varargs area which is why this if

       // statement is needed.

       //

       intptr_t* fp = interpreter_frame->fp();

       int local_words = method->max_locals() * Interpreter::stackElementWords();

       if (caller->is_compiled_frame()) {

         locals = fp + frame::register_save_words + local_words - 1;

       } else {

         locals = fp + frame::memory_parameter_word_sp_offset + local_words - 1;

       }

     }

     // END MUCHO HACK

     intptr_t* monitor_base = (intptr_t*) cur_state;

     intptr_t* stack_base =  monitor_base - monitor_size;

     /* +1 because stack is always prepushed */

     intptr_t* stack = stack_base - (tempcount + 1);

     BytecodeInterpreter::layout_interpreterState(cur_state,

                                           caller,

                                           interpreter_frame,

                                           method,

                                           locals,

                                           stack,

                                           stack_base,

                                           monitor_base,

                                           frame_bottom,

                                           is_top_frame);

     BytecodeInterpreter::pd_layout_interpreterState(cur_state, interpreter_return_address, interpreter_frame->fp());

   }

   return frame_words;

 }

 #endif // CC_INTERP