jdk8-mips64-public/hotspot: src/cpu/sparc/vm/cppInterpreter

src/cpu/sparc/vm/cppInterpreter_sparc.cpp@1d7922586cf6 (annotated)

src/cpu/sparc/vm/cppInterpreter_sparc.cpp

Tue, 24 Jul 2012 10:51:00 -0700

author: twisti
date: Tue, 24 Jul 2012 10:51:00 -0700
changeset 3969: 1d7922586cf6
parent 3826: 2fe087c3e814
child 4037: da91efe96a93
permissions: -rw-r--r--

7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>

 /*
  * Copyright (c) 2007, 2012, 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::const_offset()), G3_scratch);
     __ ld_ptr(G3_scratch, in_bytes(constMethodOopDesc::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::tos_state_shift, G1_scratch);
     // Make sure we don't need to mask G1_scratch after the above shift
     ConstantPoolCacheEntry::verify_tos_state_shift();
     __ 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(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_short(G3_scratch, Assembler::pn, pending_exception_present);
     __ 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 = in_bytes(Klass::java_mirror_offset());
     __ ld_ptr(Address(G5_method, 0, in_bytes(methodOopDesc:: const_offset())), O1);
     __ ld_ptr(Address(O1, 0, in_bytes(constMethodOopDesc::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,
 ,
                 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 constMethod       (G5_method, 0, in_bytes(methodOopDesc::const_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(constMethod, O3);
   __ ld_ptr(O3, in_bytes(constMethodOopDesc::constants_offset()), 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 = in_bytes(Klass::java_mirror_offset());
     __ 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(constMethod, O1);
     __ ld_ptr( O1, in_bytes(constMethodOopDesc::constants_offset()), 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, Assembler::ptr_cc);
   #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(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(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(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(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(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(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(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 constMethod       (G5_method, 0, in_bytes(methodOopDesc::const_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(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(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(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(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(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(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(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(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() ?
 *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 caller_actual_parameters,
                                            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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/cppInterpreter_sparc.cpp@1d7922586cf6 (annotated)

src/cpu/sparc/vm/cppInterpreter_sparc.cpp