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 /*

  * Copyright (c) 1997, 2013, 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

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  */

 #include "precompiled.hpp"

 #include "interp_masm_sparc.hpp"

 #include "interpreter/interpreter.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "oops/arrayOop.hpp"

 #include "oops/markOop.hpp"

 #include "oops/methodData.hpp"

 #include "oops/method.hpp"

 #include "oops/methodCounters.hpp"

 #include "prims/jvmtiExport.hpp"

 #include "prims/jvmtiRedefineClassesTrace.hpp"

 #include "prims/jvmtiThreadState.hpp"

 #include "runtime/basicLock.hpp"

 #include "runtime/biasedLocking.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/thread.inline.hpp"

 #ifndef CC_INTERP

 #ifndef FAST_DISPATCH

 #define FAST_DISPATCH 1

 #endif

 #undef FAST_DISPATCH

 // Implementation of InterpreterMacroAssembler

 // This file specializes the assember with interpreter-specific macros

 const Address InterpreterMacroAssembler::l_tmp(FP, (frame::interpreter_frame_l_scratch_fp_offset * wordSize) + STACK_BIAS);

 const Address InterpreterMacroAssembler::d_tmp(FP, (frame::interpreter_frame_d_scratch_fp_offset * wordSize) + STACK_BIAS);

 #else // CC_INTERP

 #ifndef STATE

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

 #endif // STATE

 #endif // CC_INTERP

 void InterpreterMacroAssembler::compute_extra_locals_size_in_bytes(Register args_size, Register locals_size, Register delta) {

   // Note: this algorithm is also used by C1's OSR entry sequence.

   // Any changes should also be applied to CodeEmitter::emit_osr_entry().

   assert_different_registers(args_size, locals_size);

   // max_locals*2 for TAGS.  Assumes that args_size has already been adjusted.

   subcc(locals_size, args_size, delta);// extra space for non-arguments locals in words

   // Use br/mov combination because it works on both V8 and V9 and is

   // faster.

   Label skip_move;

   br(Assembler::negative, true, Assembler::pt, skip_move);

   delayed()->mov(G0, delta);

   bind(skip_move);

   round_to(delta, WordsPerLong);       // make multiple of 2 (SP must be 2-word aligned)

   sll(delta, LogBytesPerWord, delta);  // extra space for locals in bytes

 }

 #ifndef CC_INTERP

 // Dispatch code executed in the prolog of a bytecode which does not do it's

 // own dispatch. The dispatch address is computed and placed in IdispatchAddress

 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int bcp_incr) {

   assert_not_delayed();

 #ifdef FAST_DISPATCH

   // FAST_DISPATCH and ProfileInterpreter are mutually exclusive since

   // they both use I2.

   assert(!ProfileInterpreter, "FAST_DISPATCH and +ProfileInterpreter are mutually exclusive");

   ldub(Lbcp, bcp_incr, Lbyte_code);                     // load next bytecode

   add(Lbyte_code, Interpreter::distance_from_dispatch_table(state), Lbyte_code);

                                                         // add offset to correct dispatch table

   sll(Lbyte_code, LogBytesPerWord, Lbyte_code);         // multiply by wordSize

   ld_ptr(IdispatchTables, Lbyte_code, IdispatchAddress);// get entry addr

 #else

   ldub( Lbcp, bcp_incr, Lbyte_code);                    // load next bytecode

   // dispatch table to use

   AddressLiteral tbl(Interpreter::dispatch_table(state));

   sll(Lbyte_code, LogBytesPerWord, Lbyte_code);         // multiply by wordSize

   set(tbl, G3_scratch);                                 // compute addr of table

   ld_ptr(G3_scratch, Lbyte_code, IdispatchAddress);     // get entry addr

 #endif

 }

 // Dispatch code executed in the epilog of a bytecode which does not do it's

 // own dispatch. The dispatch address in IdispatchAddress is used for the

 // dispatch.

 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int bcp_incr) {

   assert_not_delayed();

   verify_FPU(1, state);

   interp_verify_oop(Otos_i, state, __FILE__, __LINE__);

   jmp( IdispatchAddress, 0 );

   if (bcp_incr != 0)  delayed()->inc(Lbcp, bcp_incr);

   else                delayed()->nop();

 }

 void InterpreterMacroAssembler::dispatch_next(TosState state, int bcp_incr) {

   // %%%% consider branching to a single shared dispatch stub (for each bcp_incr)

   assert_not_delayed();

   ldub( Lbcp, bcp_incr, Lbyte_code);               // load next bytecode

   dispatch_Lbyte_code(state, Interpreter::dispatch_table(state), bcp_incr);

 }

 void InterpreterMacroAssembler::dispatch_next_noverify_oop(TosState state, int bcp_incr) {

   // %%%% consider branching to a single shared dispatch stub (for each bcp_incr)

   assert_not_delayed();

   ldub( Lbcp, bcp_incr, Lbyte_code);               // load next bytecode

   dispatch_Lbyte_code(state, Interpreter::dispatch_table(state), bcp_incr, false);

 }

 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) {

   // load current bytecode

   assert_not_delayed();

   ldub( Lbcp, 0, Lbyte_code);               // load next bytecode

   dispatch_base(state, table);

 }

 void InterpreterMacroAssembler::call_VM_leaf_base(

   Register java_thread,

   address  entry_point,

   int      number_of_arguments

 ) {

   if (!java_thread->is_valid())

     java_thread = L7_thread_cache;

   // super call

   MacroAssembler::call_VM_leaf_base(java_thread, entry_point, number_of_arguments);

 }

 void InterpreterMacroAssembler::call_VM_base(

   Register        oop_result,

   Register        java_thread,

   Register        last_java_sp,

   address         entry_point,

   int             number_of_arguments,

   bool            check_exception

 ) {

   if (!java_thread->is_valid())

     java_thread = L7_thread_cache;

   // See class ThreadInVMfromInterpreter, which assumes that the interpreter

   // takes responsibility for setting its own thread-state on call-out.

   // However, ThreadInVMfromInterpreter resets the state to "in_Java".

   //save_bcp();                                  // save bcp

   MacroAssembler::call_VM_base(oop_result, java_thread, last_java_sp, entry_point, number_of_arguments, check_exception);

   //restore_bcp();                               // restore bcp

   //restore_locals();                            // restore locals pointer

 }

 void InterpreterMacroAssembler::check_and_handle_popframe(Register scratch_reg) {

   if (JvmtiExport::can_pop_frame()) {

     Label L;

     // Check the "pending popframe condition" flag in the current thread

     ld(G2_thread, JavaThread::popframe_condition_offset(), scratch_reg);

     // Initiate popframe handling only if it is not already being processed.  If the flag

     // has the popframe_processing bit set, it means that this code is called *during* popframe

     // handling - we don't want to reenter.

     btst(JavaThread::popframe_pending_bit, scratch_reg);

     br(zero, false, pt, L);

     delayed()->nop();

     btst(JavaThread::popframe_processing_bit, scratch_reg);

     br(notZero, false, pt, L);

     delayed()->nop();

     // Call Interpreter::remove_activation_preserving_args_entry() to get the

     // address of the same-named entrypoint in the generated interpreter code.

     call_VM_leaf(noreg, CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry));

     // Jump to Interpreter::_remove_activation_preserving_args_entry

     jmpl(O0, G0, G0);

     delayed()->nop();

     bind(L);

   }

 }

 void InterpreterMacroAssembler::load_earlyret_value(TosState state) {

   Register thr_state = G4_scratch;

   ld_ptr(G2_thread, JavaThread::jvmti_thread_state_offset(), thr_state);

   const Address tos_addr(thr_state, JvmtiThreadState::earlyret_tos_offset());

   const Address oop_addr(thr_state, JvmtiThreadState::earlyret_oop_offset());

   const Address val_addr(thr_state, JvmtiThreadState::earlyret_value_offset());

   switch (state) {

   case ltos: ld_long(val_addr, Otos_l);                   break;

   case atos: ld_ptr(oop_addr, Otos_l);

              st_ptr(G0, oop_addr);                        break;

   case btos:                                           // fall through

   case ctos:                                           // fall through

   case stos:                                           // fall through

   case itos: ld(val_addr, Otos_l1);                       break;

   case ftos: ldf(FloatRegisterImpl::S, val_addr, Ftos_f); break;

   case dtos: ldf(FloatRegisterImpl::D, val_addr, Ftos_d); break;

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

   default  : ShouldNotReachHere();

   }

   // Clean up tos value in the jvmti thread state

   or3(G0, ilgl, G3_scratch);

   stw(G3_scratch, tos_addr);

   st_long(G0, val_addr);

   interp_verify_oop(Otos_i, state, __FILE__, __LINE__);

 }

 void InterpreterMacroAssembler::check_and_handle_earlyret(Register scratch_reg) {

   if (JvmtiExport::can_force_early_return()) {

     Label L;

     Register thr_state = G3_scratch;

     ld_ptr(G2_thread, JavaThread::jvmti_thread_state_offset(), thr_state);

     br_null_short(thr_state, pt, L); // if (thread->jvmti_thread_state() == NULL) exit;

     // Initiate earlyret handling only if it is not already being processed.

     // If the flag has the earlyret_processing bit set, it means that this code

     // is called *during* earlyret handling - we don't want to reenter.

     ld(thr_state, JvmtiThreadState::earlyret_state_offset(), G4_scratch);

     cmp_and_br_short(G4_scratch, JvmtiThreadState::earlyret_pending, Assembler::notEqual, pt, L);

     // Call Interpreter::remove_activation_early_entry() to get the address of the

     // same-named entrypoint in the generated interpreter code

     ld(thr_state, JvmtiThreadState::earlyret_tos_offset(), Otos_l1);

     call_VM_leaf(noreg, CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), Otos_l1);

     // Jump to Interpreter::_remove_activation_early_entry

     jmpl(O0, G0, G0);

     delayed()->nop();

     bind(L);

   }

 }

 void InterpreterMacroAssembler::super_call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2) {

   mov(arg_1, O0);

   mov(arg_2, O1);

   MacroAssembler::call_VM_leaf_base(thread_cache, entry_point, 2);

 }

 #endif /* CC_INTERP */

 #ifndef CC_INTERP

 void InterpreterMacroAssembler::dispatch_base(TosState state, address* table) {

   assert_not_delayed();

   dispatch_Lbyte_code(state, table);

 }

 void InterpreterMacroAssembler::dispatch_normal(TosState state) {

   dispatch_base(state, Interpreter::normal_table(state));

 }

 void InterpreterMacroAssembler::dispatch_only(TosState state) {

   dispatch_base(state, Interpreter::dispatch_table(state));

 }

 // common code to dispatch and dispatch_only

 // dispatch value in Lbyte_code and increment Lbcp

 void InterpreterMacroAssembler::dispatch_Lbyte_code(TosState state, address* table, int bcp_incr, bool verify) {

   verify_FPU(1, state);

   // %%%%% maybe implement +VerifyActivationFrameSize here

   //verify_thread(); //too slow; we will just verify on method entry & exit

   if (verify) interp_verify_oop(Otos_i, state, __FILE__, __LINE__);

 #ifdef FAST_DISPATCH

   if (table == Interpreter::dispatch_table(state)) {

     // use IdispatchTables

     add(Lbyte_code, Interpreter::distance_from_dispatch_table(state), Lbyte_code);

                                                         // add offset to correct dispatch table

     sll(Lbyte_code, LogBytesPerWord, Lbyte_code);       // multiply by wordSize

     ld_ptr(IdispatchTables, Lbyte_code, G3_scratch);    // get entry addr

   } else {

 #endif

     // dispatch table to use

     AddressLiteral tbl(table);

     sll(Lbyte_code, LogBytesPerWord, Lbyte_code);       // multiply by wordSize

     set(tbl, G3_scratch);                               // compute addr of table

     ld_ptr(G3_scratch, Lbyte_code, G3_scratch);         // get entry addr

 #ifdef FAST_DISPATCH

   }

 #endif

   jmp( G3_scratch, 0 );

   if (bcp_incr != 0)  delayed()->inc(Lbcp, bcp_incr);

   else                delayed()->nop();

 }

 // Helpers for expression stack

 // Longs and doubles are Category 2 computational types in the

 // JVM specification (section 3.11.1) and take 2 expression stack or

 // local slots.

 // Aligning them on 32 bit with tagged stacks is hard because the code generated

 // for the dup* bytecodes depends on what types are already on the stack.

 // If the types are split into the two stack/local slots, that is much easier

 // (and we can use 0 for non-reference tags).

 // Known good alignment in _LP64 but unknown otherwise

 void InterpreterMacroAssembler::load_unaligned_double(Register r1, int offset, FloatRegister d) {

   assert_not_delayed();

 #ifdef _LP64

   ldf(FloatRegisterImpl::D, r1, offset, d);

 #else

   ldf(FloatRegisterImpl::S, r1, offset, d);

   ldf(FloatRegisterImpl::S, r1, offset + Interpreter::stackElementSize, d->successor());

 #endif

 }

 // Known good alignment in _LP64 but unknown otherwise

 void InterpreterMacroAssembler::store_unaligned_double(FloatRegister d, Register r1, int offset) {

   assert_not_delayed();

 #ifdef _LP64

   stf(FloatRegisterImpl::D, d, r1, offset);

   // store something more useful here

   debug_only(stx(G0, r1, offset+Interpreter::stackElementSize);)

 #else

   stf(FloatRegisterImpl::S, d, r1, offset);

   stf(FloatRegisterImpl::S, d->successor(), r1, offset + Interpreter::stackElementSize);

 #endif

 }

 // Known good alignment in _LP64 but unknown otherwise

 void InterpreterMacroAssembler::load_unaligned_long(Register r1, int offset, Register rd) {

   assert_not_delayed();

 #ifdef _LP64

   ldx(r1, offset, rd);

 #else

   ld(r1, offset, rd);

   ld(r1, offset + Interpreter::stackElementSize, rd->successor());

 #endif

 }

 // Known good alignment in _LP64 but unknown otherwise

 void InterpreterMacroAssembler::store_unaligned_long(Register l, Register r1, int offset) {

   assert_not_delayed();

 #ifdef _LP64

   stx(l, r1, offset);

   // store something more useful here

   debug_only(stx(G0, r1, offset+Interpreter::stackElementSize);)

 #else

   st(l, r1, offset);

   st(l->successor(), r1, offset + Interpreter::stackElementSize);

 #endif

 }

 void InterpreterMacroAssembler::pop_i(Register r) {

   assert_not_delayed();

   ld(Lesp, Interpreter::expr_offset_in_bytes(0), r);

   inc(Lesp, Interpreter::stackElementSize);

   debug_only(verify_esp(Lesp));

 }

 void InterpreterMacroAssembler::pop_ptr(Register r, Register scratch) {

   assert_not_delayed();

   ld_ptr(Lesp, Interpreter::expr_offset_in_bytes(0), r);

   inc(Lesp, Interpreter::stackElementSize);

   debug_only(verify_esp(Lesp));

 }

 void InterpreterMacroAssembler::pop_l(Register r) {

   assert_not_delayed();

   load_unaligned_long(Lesp, Interpreter::expr_offset_in_bytes(0), r);

   inc(Lesp, 2*Interpreter::stackElementSize);

   debug_only(verify_esp(Lesp));

 }

 void InterpreterMacroAssembler::pop_f(FloatRegister f, Register scratch) {

   assert_not_delayed();

   ldf(FloatRegisterImpl::S, Lesp, Interpreter::expr_offset_in_bytes(0), f);

   inc(Lesp, Interpreter::stackElementSize);

   debug_only(verify_esp(Lesp));

 }

 void InterpreterMacroAssembler::pop_d(FloatRegister f, Register scratch) {

   assert_not_delayed();

   load_unaligned_double(Lesp, Interpreter::expr_offset_in_bytes(0), f);

   inc(Lesp, 2*Interpreter::stackElementSize);

   debug_only(verify_esp(Lesp));

 }

 void InterpreterMacroAssembler::push_i(Register r) {

   assert_not_delayed();

   debug_only(verify_esp(Lesp));

   st(r, Lesp, 0);

   dec(Lesp, Interpreter::stackElementSize);

 }

 void InterpreterMacroAssembler::push_ptr(Register r) {

   assert_not_delayed();

   st_ptr(r, Lesp, 0);

   dec(Lesp, Interpreter::stackElementSize);

 }

 // remember: our convention for longs in SPARC is:

 // O0 (Otos_l1) has high-order part in first word,

 // O1 (Otos_l2) has low-order part in second word

 void InterpreterMacroAssembler::push_l(Register r) {

   assert_not_delayed();

   debug_only(verify_esp(Lesp));

   // Longs are stored in memory-correct order, even if unaligned.

   int offset = -Interpreter::stackElementSize;

   store_unaligned_long(r, Lesp, offset);

   dec(Lesp, 2 * Interpreter::stackElementSize);

 }

 void InterpreterMacroAssembler::push_f(FloatRegister f) {

   assert_not_delayed();

   debug_only(verify_esp(Lesp));

   stf(FloatRegisterImpl::S, f, Lesp, 0);

   dec(Lesp, Interpreter::stackElementSize);

 }

 void InterpreterMacroAssembler::push_d(FloatRegister d)   {

   assert_not_delayed();

   debug_only(verify_esp(Lesp));

   // Longs are stored in memory-correct order, even if unaligned.

   int offset = -Interpreter::stackElementSize;

   store_unaligned_double(d, Lesp, offset);

   dec(Lesp, 2 * Interpreter::stackElementSize);

 }

 void InterpreterMacroAssembler::push(TosState state) {

   interp_verify_oop(Otos_i, state, __FILE__, __LINE__);

   switch (state) {

     case atos: push_ptr();            break;

     case btos: push_i();              break;

     case ctos:

     case stos: push_i();              break;

     case itos: push_i();              break;

     case ltos: push_l();              break;

     case ftos: push_f();              break;

     case dtos: push_d();              break;

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

     default  : ShouldNotReachHere();

   }

 }

 void InterpreterMacroAssembler::pop(TosState state) {

   switch (state) {

     case atos: pop_ptr();            break;

     case btos: pop_i();              break;

     case ctos:

     case stos: pop_i();              break;

     case itos: pop_i();              break;

     case ltos: pop_l();              break;

     case ftos: pop_f();              break;

     case dtos: pop_d();              break;

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

     default  : ShouldNotReachHere();

   }

   interp_verify_oop(Otos_i, state, __FILE__, __LINE__);

 }

 // Helpers for swap and dup

 void InterpreterMacroAssembler::load_ptr(int n, Register val) {

   ld_ptr(Lesp, Interpreter::expr_offset_in_bytes(n), val);

 }

 void InterpreterMacroAssembler::store_ptr(int n, Register val) {

   st_ptr(val, Lesp, Interpreter::expr_offset_in_bytes(n));

 }

 void InterpreterMacroAssembler::load_receiver(Register param_count,

                                               Register recv) {

   sll(param_count, Interpreter::logStackElementSize, param_count);

   ld_ptr(Lesp, param_count, recv);  // gets receiver oop

 }

 void InterpreterMacroAssembler::empty_expression_stack() {

   // Reset Lesp.

   sub( Lmonitors, wordSize, Lesp );

   // Reset SP by subtracting more space from Lesp.

   Label done;

   assert(G4_scratch != Gframe_size, "Only you can prevent register aliasing!");

   // A native does not need to do this, since its callee does not change SP.

   ld(Lmethod, Method::access_flags_offset(), Gframe_size);  // Load access flags.

   btst(JVM_ACC_NATIVE, Gframe_size);

   br(Assembler::notZero, false, Assembler::pt, done);

   delayed()->nop();

   // Compute max expression stack+register save area

   ld_ptr(Lmethod, in_bytes(Method::const_offset()), Gframe_size);

   lduh(Gframe_size, in_bytes(ConstMethod::max_stack_offset()), Gframe_size);  // Load max stack.

   add(Gframe_size, frame::memory_parameter_word_sp_offset+Method::extra_stack_entries(), Gframe_size );

   //

   // now set up a stack frame with the size computed above

   //

   //round_to( Gframe_size, WordsPerLong ); // -- moved down to the "and" below

   sll( Gframe_size, LogBytesPerWord, Gframe_size );

   sub( Lesp, Gframe_size, Gframe_size );

   and3( Gframe_size, -(2 * wordSize), Gframe_size );          // align SP (downwards) to an 8/16-byte boundary

   debug_only(verify_sp(Gframe_size, G4_scratch));

 #ifdef _LP64

   sub(Gframe_size, STACK_BIAS, Gframe_size );

 #endif

   mov(Gframe_size, SP);

   bind(done);

 }

 #ifdef ASSERT

 void InterpreterMacroAssembler::verify_sp(Register Rsp, Register Rtemp) {

   Label Bad, OK;

   // Saved SP must be aligned.

 #ifdef _LP64

   btst(2*BytesPerWord-1, Rsp);

 #else

   btst(LongAlignmentMask, Rsp);

 #endif

   br(Assembler::notZero, false, Assembler::pn, Bad);

   delayed()->nop();

   // Saved SP, plus register window size, must not be above FP.

   add(Rsp, frame::register_save_words * wordSize, Rtemp);

 #ifdef _LP64

   sub(Rtemp, STACK_BIAS, Rtemp);  // Bias Rtemp before cmp to FP

 #endif

   cmp_and_brx_short(Rtemp, FP, Assembler::greaterUnsigned, Assembler::pn, Bad);

   // Saved SP must not be ridiculously below current SP.

   size_t maxstack = MAX2(JavaThread::stack_size_at_create(), (size_t) 4*K*K);

   set(maxstack, Rtemp);

   sub(SP, Rtemp, Rtemp);

 #ifdef _LP64

   add(Rtemp, STACK_BIAS, Rtemp);  // Unbias Rtemp before cmp to Rsp

 #endif

   cmp_and_brx_short(Rsp, Rtemp, Assembler::lessUnsigned, Assembler::pn, Bad);

   ba_short(OK);

   bind(Bad);

   stop("on return to interpreted call, restored SP is corrupted");

   bind(OK);

 }

 void InterpreterMacroAssembler::verify_esp(Register Resp) {

   // about to read or write Resp[0]

   // make sure it is not in the monitors or the register save area

   Label OK1, OK2;

   cmp(Resp, Lmonitors);

   brx(Assembler::lessUnsigned, true, Assembler::pt, OK1);

   delayed()->sub(Resp, frame::memory_parameter_word_sp_offset * wordSize, Resp);

   stop("too many pops:  Lesp points into monitor area");

   bind(OK1);

 #ifdef _LP64

   sub(Resp, STACK_BIAS, Resp);

 #endif

   cmp(Resp, SP);

   brx(Assembler::greaterEqualUnsigned, false, Assembler::pt, OK2);

   delayed()->add(Resp, STACK_BIAS + frame::memory_parameter_word_sp_offset * wordSize, Resp);

   stop("too many pushes:  Lesp points into register window");

   bind(OK2);

 }

 #endif // ASSERT

 // Load compiled (i2c) or interpreter entry when calling from interpreted and

 // do the call. Centralized so that all interpreter calls will do the same actions.

 // If jvmti single stepping is on for a thread we must not call compiled code.

 void InterpreterMacroAssembler::call_from_interpreter(Register target, Register scratch, Register Rret) {

   // Assume we want to go compiled if available

   ld_ptr(G5_method, in_bytes(Method::from_interpreted_offset()), target);

   if (JvmtiExport::can_post_interpreter_events()) {

     // JVMTI events, such as single-stepping, are implemented partly by avoiding running

     // compiled code in threads for which the event is enabled.  Check here for

     // interp_only_mode if these events CAN be enabled.

     verify_thread();

     Label skip_compiled_code;

     const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());

     ld(interp_only, scratch);

     cmp_zero_and_br(Assembler::notZero, scratch, skip_compiled_code, true, Assembler::pn);

     delayed()->ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target);

     bind(skip_compiled_code);

   }

   // the i2c_adapters need Method* in G5_method (right? %%%)

   // do the call

 #ifdef ASSERT

   {

     Label ok;

     br_notnull_short(target, Assembler::pt, ok);

     stop("null entry point");

     bind(ok);

   }

 #endif // ASSERT

   // Adjust Rret first so Llast_SP can be same as Rret

   add(Rret, -frame::pc_return_offset, O7);

   add(Lesp, BytesPerWord, Gargs); // setup parameter pointer

   // Record SP so we can remove any stack space allocated by adapter transition

   jmp(target, 0);

   delayed()->mov(SP, Llast_SP);

 }

 void InterpreterMacroAssembler::if_cmp(Condition cc, bool ptr_compare) {

   assert_not_delayed();

   Label not_taken;

   if (ptr_compare) brx(cc, false, Assembler::pn, not_taken);

   else             br (cc, false, Assembler::pn, not_taken);

   delayed()->nop();

   TemplateTable::branch(false,false);

   bind(not_taken);

   profile_not_taken_branch(G3_scratch);

 }

 void InterpreterMacroAssembler::get_2_byte_integer_at_bcp(

                                   int         bcp_offset,

                                   Register    Rtmp,

                                   Register    Rdst,

                                   signedOrNot is_signed,

                                   setCCOrNot  should_set_CC ) {

   assert(Rtmp != Rdst, "need separate temp register");

   assert_not_delayed();

   switch (is_signed) {

    default: ShouldNotReachHere();

    case   Signed:  ldsb( Lbcp, bcp_offset, Rdst  );  break; // high byte

    case Unsigned:  ldub( Lbcp, bcp_offset, Rdst  );  break; // high byte

   }

   ldub( Lbcp, bcp_offset + 1, Rtmp ); // low byte

   sll( Rdst, BitsPerByte, Rdst);

   switch (should_set_CC ) {

    default: ShouldNotReachHere();

    case      set_CC:  orcc( Rdst, Rtmp, Rdst ); break;

    case dont_set_CC:  or3(  Rdst, Rtmp, Rdst ); break;

   }

 }

 void InterpreterMacroAssembler::get_4_byte_integer_at_bcp(

                                   int        bcp_offset,

                                   Register   Rtmp,

                                   Register   Rdst,

                                   setCCOrNot should_set_CC ) {

   assert(Rtmp != Rdst, "need separate temp register");

   assert_not_delayed();

   add( Lbcp, bcp_offset, Rtmp);

   andcc( Rtmp, 3, G0);

   Label aligned;

   switch (should_set_CC ) {

    default: ShouldNotReachHere();

    case      set_CC: break;

    case dont_set_CC: break;

   }

   br(Assembler::zero, true, Assembler::pn, aligned);

 #ifdef _LP64

   delayed()->ldsw(Rtmp, 0, Rdst);

 #else

   delayed()->ld(Rtmp, 0, Rdst);

 #endif

   ldub(Lbcp, bcp_offset + 3, Rdst);

   ldub(Lbcp, bcp_offset + 2, Rtmp);  sll(Rtmp,  8, Rtmp);  or3(Rtmp, Rdst, Rdst);

   ldub(Lbcp, bcp_offset + 1, Rtmp);  sll(Rtmp, 16, Rtmp);  or3(Rtmp, Rdst, Rdst);

 #ifdef _LP64

   ldsb(Lbcp, bcp_offset + 0, Rtmp);  sll(Rtmp, 24, Rtmp);

 #else

   // Unsigned load is faster than signed on some implementations

   ldub(Lbcp, bcp_offset + 0, Rtmp);  sll(Rtmp, 24, Rtmp);

 #endif

   or3(Rtmp, Rdst, Rdst );

   bind(aligned);

   if (should_set_CC == set_CC) tst(Rdst);

 }

 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register temp, Register index,

                                                        int bcp_offset, size_t index_size) {

   assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");

   if (index_size == sizeof(u2)) {

     get_2_byte_integer_at_bcp(bcp_offset, temp, index, Unsigned);

   } else if (index_size == sizeof(u4)) {

     assert(EnableInvokeDynamic, "giant index used only for JSR 292");

     get_4_byte_integer_at_bcp(bcp_offset, temp, index);

     assert(ConstantPool::decode_invokedynamic_index(~123) == 123, "else change next line");

     xor3(index, -1, index);  // convert to plain index

   } else if (index_size == sizeof(u1)) {

     ldub(Lbcp, bcp_offset, index);

   } else {

     ShouldNotReachHere();

   }

 }

 void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache, Register tmp,

                                                            int bcp_offset, size_t index_size) {

   assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");

   assert_different_registers(cache, tmp);

   assert_not_delayed();

   get_cache_index_at_bcp(cache, tmp, bcp_offset, index_size);

   // convert from field index to ConstantPoolCacheEntry index and from

   // word index to byte offset

   sll(tmp, exact_log2(in_words(ConstantPoolCacheEntry::size()) * BytesPerWord), tmp);

   add(LcpoolCache, tmp, cache);

 }

 void InterpreterMacroAssembler::get_cache_and_index_and_bytecode_at_bcp(Register cache,

                                                                         Register temp,

                                                                         Register bytecode,

                                                                         int byte_no,

                                                                         int bcp_offset,

                                                                         size_t index_size) {

   get_cache_and_index_at_bcp(cache, temp, bcp_offset, index_size);

   ld_ptr(cache, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::indices_offset(), bytecode);

   const int shift_count = (1 + byte_no) * BitsPerByte;

   assert((byte_no == TemplateTable::f1_byte && shift_count == ConstantPoolCacheEntry::bytecode_1_shift) ||

          (byte_no == TemplateTable::f2_byte && shift_count == ConstantPoolCacheEntry::bytecode_2_shift),

          "correct shift count");

   srl(bytecode, shift_count, bytecode);

   assert(ConstantPoolCacheEntry::bytecode_1_mask == ConstantPoolCacheEntry::bytecode_2_mask, "common mask");

   and3(bytecode, ConstantPoolCacheEntry::bytecode_1_mask, bytecode);

 }

 void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache, Register tmp,

                                                                int bcp_offset, size_t index_size) {

   assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");

   assert_different_registers(cache, tmp);

   assert_not_delayed();

   if (index_size == sizeof(u2)) {

     get_2_byte_integer_at_bcp(bcp_offset, cache, tmp, Unsigned);

   } else {

     ShouldNotReachHere();  // other sizes not supported here

   }

               // convert from field index to ConstantPoolCacheEntry index

               // and from word index to byte offset

   sll(tmp, exact_log2(in_words(ConstantPoolCacheEntry::size()) * BytesPerWord), tmp);

               // skip past the header

   add(tmp, in_bytes(ConstantPoolCache::base_offset()), tmp);

               // construct pointer to cache entry

   add(LcpoolCache, tmp, cache);

 }

 // Load object from cpool->resolved_references(index)

 void InterpreterMacroAssembler::load_resolved_reference_at_index(

                                            Register result, Register index) {

   assert_different_registers(result, index);

   assert_not_delayed();

   // convert from field index to resolved_references() index and from

   // word index to byte offset. Since this is a java object, it can be compressed

   Register tmp = index;  // reuse

   sll(index, LogBytesPerHeapOop, tmp);

   get_constant_pool(result);

   // load pointer for resolved_references[] objArray

   ld_ptr(result, ConstantPool::resolved_references_offset_in_bytes(), result);

   // JNIHandles::resolve(result)

   ld_ptr(result, 0, result);

   // Add in the index

   add(result, tmp, result);

   load_heap_oop(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT), result);

 }

 // Generate a subtype check: branch to ok_is_subtype if sub_klass is

 // a subtype of super_klass.  Blows registers Rsuper_klass, Rsub_klass, tmp1, tmp2.

 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,

                                                   Register Rsuper_klass,

                                                   Register Rtmp1,

                                                   Register Rtmp2,

                                                   Register Rtmp3,

                                                   Label &ok_is_subtype ) {

   Label not_subtype;

   // Profile the not-null value's klass.

   profile_typecheck(Rsub_klass, Rtmp1);

   check_klass_subtype_fast_path(Rsub_klass, Rsuper_klass,

                                 Rtmp1, Rtmp2,

                                 &ok_is_subtype, &not_subtype, NULL);

   check_klass_subtype_slow_path(Rsub_klass, Rsuper_klass,

                                 Rtmp1, Rtmp2, Rtmp3, /*hack:*/ noreg,

                                 &ok_is_subtype, NULL);

   bind(not_subtype);

   profile_typecheck_failed(Rtmp1);

 }

 // Separate these two to allow for delay slot in middle

 // These are used to do a test and full jump to exception-throwing code.

 // %%%%% Could possibly reoptimize this by testing to see if could use

 // a single conditional branch (i.e. if span is small enough.

 // If you go that route, than get rid of the split and give up

 // on the delay-slot hack.

 void InterpreterMacroAssembler::throw_if_not_1_icc( Condition ok_condition,

                                                     Label&    ok ) {

   assert_not_delayed();

   br(ok_condition, true, pt, ok);

   // DELAY SLOT

 }

 void InterpreterMacroAssembler::throw_if_not_1_xcc( Condition ok_condition,

                                                     Label&    ok ) {

   assert_not_delayed();

   bp( ok_condition, true, Assembler::xcc, pt, ok);

   // DELAY SLOT

 }

 void InterpreterMacroAssembler::throw_if_not_1_x( Condition ok_condition,

                                                   Label&    ok ) {

   assert_not_delayed();

   brx(ok_condition, true, pt, ok);

   // DELAY SLOT

 }

 void InterpreterMacroAssembler::throw_if_not_2( address  throw_entry_point,

                                                 Register Rscratch,

                                                 Label&   ok ) {

   assert(throw_entry_point != NULL, "entry point must be generated by now");

   AddressLiteral dest(throw_entry_point);

   jump_to(dest, Rscratch);

   delayed()->nop();

   bind(ok);

 }

 // And if you cannot use the delay slot, here is a shorthand:

 void InterpreterMacroAssembler::throw_if_not_icc( Condition ok_condition,

                                                   address   throw_entry_point,

                                                   Register  Rscratch ) {

   Label ok;

   if (ok_condition != never) {

     throw_if_not_1_icc( ok_condition, ok);

     delayed()->nop();

   }

   throw_if_not_2( throw_entry_point, Rscratch, ok);

 }

 void InterpreterMacroAssembler::throw_if_not_xcc( Condition ok_condition,

                                                   address   throw_entry_point,

                                                   Register  Rscratch ) {

   Label ok;

   if (ok_condition != never) {

     throw_if_not_1_xcc( ok_condition, ok);

     delayed()->nop();

   }

   throw_if_not_2( throw_entry_point, Rscratch, ok);

 }

 void InterpreterMacroAssembler::throw_if_not_x( Condition ok_condition,

                                                 address   throw_entry_point,

                                                 Register  Rscratch ) {

   Label ok;

   if (ok_condition != never) {

     throw_if_not_1_x( ok_condition, ok);

     delayed()->nop();

   }

   throw_if_not_2( throw_entry_point, Rscratch, ok);

 }

 // Check that index is in range for array, then shift index by index_shift, and put arrayOop + shifted_index into res

 // Note: res is still shy of address by array offset into object.

 void InterpreterMacroAssembler::index_check_without_pop(Register array, Register index, int index_shift, Register tmp, Register res) {

   assert_not_delayed();

   verify_oop(array);

 #ifdef _LP64

   // sign extend since tos (index) can be a 32bit value

   sra(index, G0, index);

 #endif // _LP64

   // check array

   Label ptr_ok;

   tst(array);

   throw_if_not_1_x( notZero, ptr_ok );

   delayed()->ld( array, arrayOopDesc::length_offset_in_bytes(), tmp ); // check index

   throw_if_not_2( Interpreter::_throw_NullPointerException_entry, G3_scratch, ptr_ok);

   Label index_ok;

   cmp(index, tmp);

   throw_if_not_1_icc( lessUnsigned, index_ok );

   if (index_shift > 0)  delayed()->sll(index, index_shift, index);

   else                  delayed()->add(array, index, res); // addr - const offset in index

   // convention: move aberrant index into G3_scratch for exception message

   mov(index, G3_scratch);

   throw_if_not_2( Interpreter::_throw_ArrayIndexOutOfBoundsException_entry, G4_scratch, index_ok);

   // add offset if didn't do it in delay slot

   if (index_shift > 0)   add(array, index, res); // addr - const offset in index

 }

 void InterpreterMacroAssembler::index_check(Register array, Register index, int index_shift, Register tmp, Register res) {

   assert_not_delayed();

   // pop array

   pop_ptr(array);

   // check array

   index_check_without_pop(array, index, index_shift, tmp, res);

 }

 void InterpreterMacroAssembler::get_const(Register Rdst) {

   ld_ptr(Lmethod, in_bytes(Method::const_offset()), Rdst);

 }

 void InterpreterMacroAssembler::get_constant_pool(Register Rdst) {

   get_const(Rdst);

   ld_ptr(Rdst, in_bytes(ConstMethod::constants_offset()), Rdst);

 }

 void InterpreterMacroAssembler::get_constant_pool_cache(Register Rdst) {

   get_constant_pool(Rdst);

   ld_ptr(Rdst, ConstantPool::cache_offset_in_bytes(), Rdst);

 }

 void InterpreterMacroAssembler::get_cpool_and_tags(Register Rcpool, Register Rtags) {

   get_constant_pool(Rcpool);

   ld_ptr(Rcpool, ConstantPool::tags_offset_in_bytes(), Rtags);

 }

 // unlock if synchronized method

 //

 // Unlock the receiver if this is a synchronized method.

 // Unlock any Java monitors from syncronized blocks.

 //

 // If there are locked Java monitors

 //    If throw_monitor_exception

 //       throws IllegalMonitorStateException

 //    Else if install_monitor_exception

 //       installs IllegalMonitorStateException

 //    Else

 //       no error processing

 void InterpreterMacroAssembler::unlock_if_synchronized_method(TosState state,

                                                               bool throw_monitor_exception,

                                                               bool install_monitor_exception) {

   Label unlocked, unlock, no_unlock;

   // get the value of _do_not_unlock_if_synchronized into G1_scratch

   const Address do_not_unlock_if_synchronized(G2_thread,

     JavaThread::do_not_unlock_if_synchronized_offset());

   ldbool(do_not_unlock_if_synchronized, G1_scratch);

   stbool(G0, do_not_unlock_if_synchronized); // reset the flag

   // check if synchronized method

   const Address access_flags(Lmethod, Method::access_flags_offset());

   interp_verify_oop(Otos_i, state, __FILE__, __LINE__);

   push(state); // save tos

   ld(access_flags, G3_scratch); // Load access flags.

   btst(JVM_ACC_SYNCHRONIZED, G3_scratch);

   br(zero, false, pt, unlocked);

   delayed()->nop();

   // Don't unlock anything if the _do_not_unlock_if_synchronized flag

   // is set.

   cmp_zero_and_br(Assembler::notZero, G1_scratch, no_unlock);

   delayed()->nop();

   // BasicObjectLock will be first in list, since this is a synchronized method. However, need

   // to check that the object has not been unlocked by an explicit monitorexit bytecode.

   //Intel: if (throw_monitor_exception) ... else ...

   // Entry already unlocked, need to throw exception

   //...

   // pass top-most monitor elem

   add( top_most_monitor(), O1 );

   ld_ptr(O1, BasicObjectLock::obj_offset_in_bytes(), G3_scratch);

   br_notnull_short(G3_scratch, pt, unlock);

   if (throw_monitor_exception) {

     // Entry already unlocked need to throw an exception

     MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception));

     should_not_reach_here();

   } else {

     // Monitor already unlocked during a stack unroll.

     // If requested, install an illegal_monitor_state_exception.

     // Continue with stack unrolling.

     if (install_monitor_exception) {

       MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::new_illegal_monitor_state_exception));

     }

     ba_short(unlocked);

   }

   bind(unlock);

   unlock_object(O1);

   bind(unlocked);

   // I0, I1: Might contain return value

   // Check that all monitors are unlocked

   { Label loop, exception, entry, restart;

     Register Rmptr   = O0;

     Register Rtemp   = O1;

     Register Rlimit  = Lmonitors;

     const jint delta = frame::interpreter_frame_monitor_size() * wordSize;

     assert( (delta & LongAlignmentMask) == 0,

             "sizeof BasicObjectLock must be even number of doublewords");

     #ifdef ASSERT

     add(top_most_monitor(), Rmptr, delta);

     { Label L;

       // ensure that Rmptr starts out above (or at) Rlimit

       cmp_and_brx_short(Rmptr, Rlimit, Assembler::greaterEqualUnsigned, pn, L);

       stop("monitor stack has negative size");

       bind(L);

     }

     #endif

     bind(restart);

     ba(entry);

     delayed()->

     add(top_most_monitor(), Rmptr, delta);      // points to current entry, starting with bottom-most entry

     // Entry is still locked, need to throw exception

     bind(exception);

     if (throw_monitor_exception) {

       MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception));

       should_not_reach_here();

     } else {

       // Stack unrolling. Unlock object and if requested, install illegal_monitor_exception.

       // Unlock does not block, so don't have to worry about the frame

       unlock_object(Rmptr);

       if (install_monitor_exception) {

         MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::new_illegal_monitor_state_exception));

       }

       ba_short(restart);

     }

     bind(loop);

     cmp(Rtemp, G0);                             // check if current entry is used

     brx(Assembler::notEqual, false, pn, exception);

     delayed()->

     dec(Rmptr, delta);                          // otherwise advance to next entry

     #ifdef ASSERT

     { Label L;

       // ensure that Rmptr has not somehow stepped below Rlimit

       cmp_and_brx_short(Rmptr, Rlimit, Assembler::greaterEqualUnsigned, pn, L);

       stop("ran off the end of the monitor stack");

       bind(L);

     }

     #endif

     bind(entry);

     cmp(Rmptr, Rlimit);                         // check if bottom reached

     brx(Assembler::notEqual, true, pn, loop);   // if not at bottom then check this entry

     delayed()->

     ld_ptr(Rmptr, BasicObjectLock::obj_offset_in_bytes() - delta, Rtemp);

   }

   bind(no_unlock);

   pop(state);

   interp_verify_oop(Otos_i, state, __FILE__, __LINE__);

 }

 // remove activation

 //

 // Unlock the receiver if this is a synchronized method.

 // Unlock any Java monitors from syncronized blocks.

 // Remove the activation from the stack.

 //

 // If there are locked Java monitors

 //    If throw_monitor_exception

 //       throws IllegalMonitorStateException

 //    Else if install_monitor_exception

 //       installs IllegalMonitorStateException

 //    Else

 //       no error processing

 void InterpreterMacroAssembler::remove_activation(TosState state,

                                                   bool throw_monitor_exception,

                                                   bool install_monitor_exception) {

   unlock_if_synchronized_method(state, throw_monitor_exception, install_monitor_exception);

   // save result (push state before jvmti call and pop it afterwards) and notify jvmti

   notify_method_exit(false, state, NotifyJVMTI);

   interp_verify_oop(Otos_i, state, __FILE__, __LINE__);

   verify_thread();

   // return tos

   assert(Otos_l1 == Otos_i, "adjust code below");

   switch (state) {

 #ifdef _LP64

   case ltos: mov(Otos_l, Otos_l->after_save()); break; // O0 -> I0

 #else

   case ltos: mov(Otos_l2, Otos_l2->after_save()); // fall through  // O1 -> I1

 #endif

   case btos:                                      // fall through

   case ctos:

   case stos:                                      // fall through

   case atos:                                      // fall through

   case itos: mov(Otos_l1, Otos_l1->after_save());    break;        // O0 -> I0

   case ftos:                                      // fall through

   case dtos:                                      // fall through

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

   default  : ShouldNotReachHere();

   }

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

   if (state == ltos) {

     // 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 */

 }

 #endif /* CC_INTERP */

 // Lock object

 //

 // Argument - lock_reg points to the BasicObjectLock to be used for locking,

 //            it must be initialized with the object to lock

 void InterpreterMacroAssembler::lock_object(Register lock_reg, Register Object) {

   if (UseHeavyMonitors) {

     call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), lock_reg);

   }

   else {

     Register obj_reg = Object;

     Register mark_reg = G4_scratch;

     Register temp_reg = G1_scratch;

     Address  lock_addr(lock_reg, BasicObjectLock::lock_offset_in_bytes());

     Address  mark_addr(obj_reg, oopDesc::mark_offset_in_bytes());

     Label    done;

     Label slow_case;

     assert_different_registers(lock_reg, obj_reg, mark_reg, temp_reg);

     // load markOop from object into mark_reg

     ld_ptr(mark_addr, mark_reg);

     if (UseBiasedLocking) {

       biased_locking_enter(obj_reg, mark_reg, temp_reg, done, &slow_case);

     }

     // get the address of basicLock on stack that will be stored in the object

     // we need a temporary register here as we do not want to clobber lock_reg

     // (cas clobbers the destination register)

     mov(lock_reg, temp_reg);

     // set mark reg to be (markOop of object | UNLOCK_VALUE)

     or3(mark_reg, markOopDesc::unlocked_value, mark_reg);

     // initialize the box  (Must happen before we update the object mark!)

     st_ptr(mark_reg, lock_addr, BasicLock::displaced_header_offset_in_bytes());

     // compare and exchange object_addr, markOop | 1, stack address of basicLock

     assert(mark_addr.disp() == 0, "cas must take a zero displacement");

     cas_ptr(mark_addr.base(), mark_reg, temp_reg);

     // if the compare and exchange succeeded we are done (we saw an unlocked object)

     cmp_and_brx_short(mark_reg, temp_reg, Assembler::equal, Assembler::pt, done);

     // We did not see an unlocked object so try the fast recursive case

     // Check if owner is self by comparing the value in the markOop of object

     // with the stack pointer

     sub(temp_reg, SP, temp_reg);

 #ifdef _LP64

     sub(temp_reg, STACK_BIAS, temp_reg);

 #endif

     assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");

     // Composite "andcc" test:

     // (a) %sp -vs- markword proximity check, and,

     // (b) verify mark word LSBs == 0 (Stack-locked).

     //

     // FFFFF003/FFFFFFFFFFFF003 is (markOopDesc::lock_mask_in_place | -os::vm_page_size())

     // Note that the page size used for %sp proximity testing is arbitrary and is

     // unrelated to the actual MMU page size.  We use a 'logical' page size of

     // 4096 bytes.   F..FFF003 is designed to fit conveniently in the SIMM13 immediate

     // field of the andcc instruction.

     andcc (temp_reg, 0xFFFFF003, G0) ;

     // if condition is true we are done and hence we can store 0 in the displaced

     // header indicating it is a recursive lock and be done

     brx(Assembler::zero, true, Assembler::pt, done);

     delayed()->st_ptr(G0, lock_addr, BasicLock::displaced_header_offset_in_bytes());

     // none of the above fast optimizations worked so we have to get into the

     // slow case of monitor enter

     bind(slow_case);

     call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), lock_reg);

     bind(done);

   }

 }

 // Unlocks an object. Used in monitorexit bytecode and remove_activation.

 //

 // Argument - lock_reg points to the BasicObjectLock for lock

 // Throw IllegalMonitorException if object is not locked by current thread

 void InterpreterMacroAssembler::unlock_object(Register lock_reg) {

   if (UseHeavyMonitors) {

     call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg);

   } else {

     Register obj_reg = G3_scratch;

     Register mark_reg = G4_scratch;

     Register displaced_header_reg = G1_scratch;

     Address  lockobj_addr(lock_reg, BasicObjectLock::obj_offset_in_bytes());

     Address  mark_addr(obj_reg, oopDesc::mark_offset_in_bytes());

     Label    done;

     if (UseBiasedLocking) {

       // load the object out of the BasicObjectLock

       ld_ptr(lockobj_addr, obj_reg);

       biased_locking_exit(mark_addr, mark_reg, done, true);

       st_ptr(G0, lockobj_addr);  // free entry

     }

     // Test first if we are in the fast recursive case

     Address lock_addr(lock_reg, BasicObjectLock::lock_offset_in_bytes() + BasicLock::displaced_header_offset_in_bytes());

     ld_ptr(lock_addr, displaced_header_reg);

     br_null(displaced_header_reg, true, Assembler::pn, done);

     delayed()->st_ptr(G0, lockobj_addr);  // free entry

     // See if it is still a light weight lock, if so we just unlock

     // the object and we are done

     if (!UseBiasedLocking) {

       // load the object out of the BasicObjectLock

       ld_ptr(lockobj_addr, obj_reg);

     }

     // we have the displaced header in displaced_header_reg

     // we expect to see the stack address of the basicLock in case the

     // lock is still a light weight lock (lock_reg)

     assert(mark_addr.disp() == 0, "cas must take a zero displacement");

     cas_ptr(mark_addr.base(), lock_reg, displaced_header_reg);

     cmp(lock_reg, displaced_header_reg);

     brx(Assembler::equal, true, Assembler::pn, done);

     delayed()->st_ptr(G0, lockobj_addr);  // free entry

     // The lock has been converted into a heavy lock and hence

     // we need to get into the slow case

     call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg);

     bind(done);

   }

 }

 #ifndef CC_INTERP

 // Get the method data pointer from the Method* and set the

 // specified register to its value.

 void InterpreterMacroAssembler::set_method_data_pointer() {

   assert(ProfileInterpreter, "must be profiling interpreter");

   Label get_continue;

   ld_ptr(Lmethod, in_bytes(Method::method_data_offset()), ImethodDataPtr);

   test_method_data_pointer(get_continue);

   add(ImethodDataPtr, in_bytes(MethodData::data_offset()), ImethodDataPtr);

   bind(get_continue);

 }

 // Set the method data pointer for the current bcp.

 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {

   assert(ProfileInterpreter, "must be profiling interpreter");

   Label zero_continue;

   // Test MDO to avoid the call if it is NULL.

   ld_ptr(Lmethod, in_bytes(Method::method_data_offset()), ImethodDataPtr);

   test_method_data_pointer(zero_continue);

   call_VM_leaf(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), Lmethod, Lbcp);

   add(ImethodDataPtr, in_bytes(MethodData::data_offset()), ImethodDataPtr);

   add(ImethodDataPtr, O0, ImethodDataPtr);

   bind(zero_continue);

 }

 // Test ImethodDataPtr.  If it is null, continue at the specified label

 void InterpreterMacroAssembler::test_method_data_pointer(Label& zero_continue) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   br_null_short(ImethodDataPtr, Assembler::pn, zero_continue);

 }

 void InterpreterMacroAssembler::verify_method_data_pointer() {

   assert(ProfileInterpreter, "must be profiling interpreter");

 #ifdef ASSERT

   Label verify_continue;

   test_method_data_pointer(verify_continue);

   // If the mdp is valid, it will point to a DataLayout header which is

   // consistent with the bcp.  The converse is highly probable also.

   lduh(ImethodDataPtr, in_bytes(DataLayout::bci_offset()), G3_scratch);

   ld_ptr(Lmethod, Method::const_offset(), O5);

   add(G3_scratch, in_bytes(ConstMethod::codes_offset()), G3_scratch);

   add(G3_scratch, O5, G3_scratch);

   cmp(Lbcp, G3_scratch);

   brx(Assembler::equal, false, Assembler::pt, verify_continue);

   Register temp_reg = O5;

   delayed()->mov(ImethodDataPtr, temp_reg);

   // %%% should use call_VM_leaf here?

   //call_VM_leaf(noreg, ..., Lmethod, Lbcp, ImethodDataPtr);

   save_frame_and_mov(sizeof(jdouble) / wordSize, Lmethod, O0, Lbcp, O1);

   Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);

   stf(FloatRegisterImpl::D, Ftos_d, d_save);

   mov(temp_reg->after_save(), O2);

   save_thread(L7_thread_cache);

   call(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), relocInfo::none);

   delayed()->nop();

   restore_thread(L7_thread_cache);

   ldf(FloatRegisterImpl::D, d_save, Ftos_d);

   restore();

   bind(verify_continue);

 #endif // ASSERT

 }

 void InterpreterMacroAssembler::test_invocation_counter_for_mdp(Register invocation_count,

                                                                 Register Rtmp,

                                                                 Label &profile_continue) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   // Control will flow to "profile_continue" if the counter is less than the

   // limit or if we call profile_method()

   Label done;

   // if no method data exists, and the counter is high enough, make one

   br_notnull_short(ImethodDataPtr, Assembler::pn, done);

   // Test to see if we should create a method data oop

   AddressLiteral profile_limit((address) &InvocationCounter::InterpreterProfileLimit);

   sethi(profile_limit, Rtmp);

   ld(Rtmp, profile_limit.low10(), Rtmp);

   cmp(invocation_count, Rtmp);

   // Use long branches because call_VM() code and following code generated by

   // test_backedge_count_for_osr() is large in debug VM.

   br(Assembler::lessUnsigned, false, Assembler::pn, profile_continue);

   delayed()->nop();

   // Build it now.

   call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));

   set_method_data_pointer_for_bcp();

   ba(profile_continue);

   delayed()->nop();

   bind(done);

 }

 // Store a value at some constant offset from the method data pointer.

 void InterpreterMacroAssembler::set_mdp_data_at(int constant, Register value) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   st_ptr(value, ImethodDataPtr, constant);

 }

 void InterpreterMacroAssembler::increment_mdp_data_at(Address counter,

                                                       Register bumped_count,

                                                       bool decrement) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   // Load the counter.

   ld_ptr(counter, bumped_count);

   if (decrement) {

     // Decrement the register.  Set condition codes.

     subcc(bumped_count, DataLayout::counter_increment, bumped_count);

     // If the decrement causes the counter to overflow, stay negative

     Label L;

     brx(Assembler::negative, true, Assembler::pn, L);

     // Store the decremented counter, if it is still negative.

     delayed()->st_ptr(bumped_count, counter);

     bind(L);

   } else {

     // Increment the register.  Set carry flag.

     addcc(bumped_count, DataLayout::counter_increment, bumped_count);

     // If the increment causes the counter to overflow, pull back by 1.

     assert(DataLayout::counter_increment == 1, "subc works");

     subc(bumped_count, G0, bumped_count);

     // Store the incremented counter.

     st_ptr(bumped_count, counter);

   }

 }

 // Increment the value at some constant offset from the method data pointer.

 void InterpreterMacroAssembler::increment_mdp_data_at(int constant,

                                                       Register bumped_count,

                                                       bool decrement) {

   // Locate the counter at a fixed offset from the mdp:

   Address counter(ImethodDataPtr, constant);

   increment_mdp_data_at(counter, bumped_count, decrement);

 }

 // Increment the value at some non-fixed (reg + constant) offset from

 // the method data pointer.

 void InterpreterMacroAssembler::increment_mdp_data_at(Register reg,

                                                       int constant,

                                                       Register bumped_count,

                                                       Register scratch2,

                                                       bool decrement) {

   // Add the constant to reg to get the offset.

   add(ImethodDataPtr, reg, scratch2);

   Address counter(scratch2, constant);

   increment_mdp_data_at(counter, bumped_count, decrement);

 }

 // Set a flag value at the current method data pointer position.

 // Updates a single byte of the header, to avoid races with other header bits.

 void InterpreterMacroAssembler::set_mdp_flag_at(int flag_constant,

                                                 Register scratch) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   // Load the data header

   ldub(ImethodDataPtr, in_bytes(DataLayout::flags_offset()), scratch);

   // Set the flag

   or3(scratch, flag_constant, scratch);

   // Store the modified header.

   stb(scratch, ImethodDataPtr, in_bytes(DataLayout::flags_offset()));

 }

 // Test the location at some offset from the method data pointer.

 // If it is not equal to value, branch to the not_equal_continue Label.

 // Set condition codes to match the nullness of the loaded value.

 void InterpreterMacroAssembler::test_mdp_data_at(int offset,

                                                  Register value,

                                                  Label& not_equal_continue,

                                                  Register scratch) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   ld_ptr(ImethodDataPtr, offset, scratch);

   cmp(value, scratch);

   brx(Assembler::notEqual, false, Assembler::pn, not_equal_continue);

   delayed()->tst(scratch);

 }

 // Update the method data pointer by the displacement located at some fixed

 // offset from the method data pointer.

 void InterpreterMacroAssembler::update_mdp_by_offset(int offset_of_disp,

                                                      Register scratch) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   ld_ptr(ImethodDataPtr, offset_of_disp, scratch);

   add(ImethodDataPtr, scratch, ImethodDataPtr);

 }

 // Update the method data pointer by the displacement located at the

 // offset (reg + offset_of_disp).

 void InterpreterMacroAssembler::update_mdp_by_offset(Register reg,

                                                      int offset_of_disp,

                                                      Register scratch) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   add(reg, offset_of_disp, scratch);

   ld_ptr(ImethodDataPtr, scratch, scratch);

   add(ImethodDataPtr, scratch, ImethodDataPtr);

 }

 // Update the method data pointer by a simple constant displacement.

 void InterpreterMacroAssembler::update_mdp_by_constant(int constant) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   add(ImethodDataPtr, constant, ImethodDataPtr);

 }

 // Update the method data pointer for a _ret bytecode whose target

 // was not among our cached targets.

 void InterpreterMacroAssembler::update_mdp_for_ret(TosState state,

                                                    Register return_bci) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   push(state);

   st_ptr(return_bci, l_tmp);  // protect return_bci, in case it is volatile

   call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret), return_bci);

   ld_ptr(l_tmp, return_bci);

   pop(state);

 }

 // Count a taken branch in the bytecodes.

 void InterpreterMacroAssembler::profile_taken_branch(Register scratch, Register bumped_count) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     // We are taking a branch.  Increment the taken count.

     increment_mdp_data_at(in_bytes(JumpData::taken_offset()), bumped_count);

     // The method data pointer needs to be updated to reflect the new target.

     update_mdp_by_offset(in_bytes(JumpData::displacement_offset()), scratch);

     bind (profile_continue);

   }

 }

 // Count a not-taken branch in the bytecodes.

 void InterpreterMacroAssembler::profile_not_taken_branch(Register scratch) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     // We are taking a branch.  Increment the not taken count.

     increment_mdp_data_at(in_bytes(BranchData::not_taken_offset()), scratch);

     // The method data pointer needs to be updated to correspond to the

     // next bytecode.

     update_mdp_by_constant(in_bytes(BranchData::branch_data_size()));

     bind (profile_continue);

   }

 }

 // Count a non-virtual call in the bytecodes.

 void InterpreterMacroAssembler::profile_call(Register scratch) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     // We are making a call.  Increment the count.

     increment_mdp_data_at(in_bytes(CounterData::count_offset()), scratch);

     // The method data pointer needs to be updated to reflect the new target.

     update_mdp_by_constant(in_bytes(CounterData::counter_data_size()));

     bind (profile_continue);

   }

 }

 // Count a final call in the bytecodes.

 void InterpreterMacroAssembler::profile_final_call(Register scratch) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     // We are making a call.  Increment the count.

     increment_mdp_data_at(in_bytes(CounterData::count_offset()), scratch);

     // The method data pointer needs to be updated to reflect the new target.

     update_mdp_by_constant(in_bytes(VirtualCallData::virtual_call_data_size()));

     bind (profile_continue);

   }

 }

 // Count a virtual call in the bytecodes.

 void InterpreterMacroAssembler::profile_virtual_call(Register receiver,

                                                      Register scratch,

                                                      bool receiver_can_be_null) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     Label skip_receiver_profile;

     if (receiver_can_be_null) {

       Label not_null;

       br_notnull_short(receiver, Assembler::pt, not_null);

       // We are making a call.  Increment the count for null receiver.

       increment_mdp_data_at(in_bytes(CounterData::count_offset()), scratch);

       ba_short(skip_receiver_profile);

       bind(not_null);

     }

     // Record the receiver type.

     record_klass_in_profile(receiver, scratch, true);

     bind(skip_receiver_profile);

     // The method data pointer needs to be updated to reflect the new target.

     update_mdp_by_constant(in_bytes(VirtualCallData::virtual_call_data_size()));

     bind (profile_continue);

   }

 }

 void InterpreterMacroAssembler::record_klass_in_profile_helper(

                                         Register receiver, Register scratch,

                                         int start_row, Label& done, bool is_virtual_call) {

   if (TypeProfileWidth == 0) {

     if (is_virtual_call) {

       increment_mdp_data_at(in_bytes(CounterData::count_offset()), scratch);

     }

     return;

   }

   int last_row = VirtualCallData::row_limit() - 1;

   assert(start_row <= last_row, "must be work left to do");

   // Test this row for both the receiver and for null.

   // Take any of three different outcomes:

   //   1. found receiver => increment count and goto done

   //   2. found null => keep looking for case 1, maybe allocate this cell

   //   3. found something else => keep looking for cases 1 and 2

   // Case 3 is handled by a recursive call.

   for (int row = start_row; row <= last_row; row++) {

     Label next_test;

     bool test_for_null_also = (row == start_row);

     // See if the receiver is receiver[n].

     int recvr_offset = in_bytes(VirtualCallData::receiver_offset(row));

     test_mdp_data_at(recvr_offset, receiver, next_test, scratch);

     // delayed()->tst(scratch);

     // The receiver is receiver[n].  Increment count[n].

     int count_offset = in_bytes(VirtualCallData::receiver_count_offset(row));

     increment_mdp_data_at(count_offset, scratch);

     ba_short(done);

     bind(next_test);

     if (test_for_null_also) {

       Label found_null;

       // Failed the equality check on receiver[n]...  Test for null.

       if (start_row == last_row) {

         // The only thing left to do is handle the null case.

         if (is_virtual_call) {

           brx(Assembler::zero, false, Assembler::pn, found_null);

           delayed()->nop();

           // Receiver did not match any saved receiver and there is no empty row for it.

           // Increment total counter to indicate polymorphic case.

           increment_mdp_data_at(in_bytes(CounterData::count_offset()), scratch);

           ba_short(done);

           bind(found_null);

         } else {

           brx(Assembler::notZero, false, Assembler::pt, done);

           delayed()->nop();

         }

         break;

       }

       // Since null is rare, make it be the branch-taken case.

       brx(Assembler::zero, false, Assembler::pn, found_null);

       delayed()->nop();

       // Put all the "Case 3" tests here.

       record_klass_in_profile_helper(receiver, scratch, start_row + 1, done, is_virtual_call);

       // Found a null.  Keep searching for a matching receiver,

       // but remember that this is an empty (unused) slot.

       bind(found_null);

     }

   }

   // In the fall-through case, we found no matching receiver, but we

   // observed the receiver[start_row] is NULL.

   // Fill in the receiver field and increment the count.

   int recvr_offset = in_bytes(VirtualCallData::receiver_offset(start_row));

   set_mdp_data_at(recvr_offset, receiver);

   int count_offset = in_bytes(VirtualCallData::receiver_count_offset(start_row));

   mov(DataLayout::counter_increment, scratch);

   set_mdp_data_at(count_offset, scratch);

   if (start_row > 0) {

     ba_short(done);

   }

 }

 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver,

                                                         Register scratch, bool is_virtual_call) {

   assert(ProfileInterpreter, "must be profiling");

   Label done;

   record_klass_in_profile_helper(receiver, scratch, 0, done, is_virtual_call);

   bind (done);

 }

 // Count a ret in the bytecodes.

 void InterpreterMacroAssembler::profile_ret(TosState state,

                                             Register return_bci,

                                             Register scratch) {

   if (ProfileInterpreter) {

     Label profile_continue;

     uint row;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     // Update the total ret count.

     increment_mdp_data_at(in_bytes(CounterData::count_offset()), scratch);

     for (row = 0; row < RetData::row_limit(); row++) {

       Label next_test;

       // See if return_bci is equal to bci[n]:

       test_mdp_data_at(in_bytes(RetData::bci_offset(row)),

                        return_bci, next_test, scratch);

       // return_bci is equal to bci[n].  Increment the count.

       increment_mdp_data_at(in_bytes(RetData::bci_count_offset(row)), scratch);

       // The method data pointer needs to be updated to reflect the new target.

       update_mdp_by_offset(in_bytes(RetData::bci_displacement_offset(row)), scratch);

       ba_short(profile_continue);

       bind(next_test);

     }

     update_mdp_for_ret(state, return_bci);

     bind (profile_continue);

   }

 }

 // Profile an unexpected null in the bytecodes.

 void InterpreterMacroAssembler::profile_null_seen(Register scratch) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     set_mdp_flag_at(BitData::null_seen_byte_constant(), scratch);

     // The method data pointer needs to be updated.

     int mdp_delta = in_bytes(BitData::bit_data_size());

     if (TypeProfileCasts) {

       mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());

     }

     update_mdp_by_constant(mdp_delta);

     bind (profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_typecheck(Register klass,

                                                   Register scratch) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     int mdp_delta = in_bytes(BitData::bit_data_size());

     if (TypeProfileCasts) {

       mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());

       // Record the object type.

       record_klass_in_profile(klass, scratch, false);

     }

     // The method data pointer needs to be updated.

     update_mdp_by_constant(mdp_delta);

     bind (profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_typecheck_failed(Register scratch) {

   if (ProfileInterpreter && TypeProfileCasts) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     int count_offset = in_bytes(CounterData::count_offset());

     // Back up the address, since we have already bumped the mdp.

     count_offset -= in_bytes(VirtualCallData::virtual_call_data_size());

     // *Decrement* the counter.  We expect to see zero or small negatives.

     increment_mdp_data_at(count_offset, scratch, true);

     bind (profile_continue);

   }

 }

 // Count the default case of a switch construct.

 void InterpreterMacroAssembler::profile_switch_default(Register scratch) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     // Update the default case count

     increment_mdp_data_at(in_bytes(MultiBranchData::default_count_offset()),

                           scratch);

     // The method data pointer needs to be updated.

     update_mdp_by_offset(

                     in_bytes(MultiBranchData::default_displacement_offset()),

                     scratch);

     bind (profile_continue);

   }

 }

 // Count the index'th case of a switch construct.

 void InterpreterMacroAssembler::profile_switch_case(Register index,

                                                     Register scratch,

                                                     Register scratch2,

                                                     Register scratch3) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(profile_continue);

     // Build the base (index * per_case_size_in_bytes()) + case_array_offset_in_bytes()

     set(in_bytes(MultiBranchData::per_case_size()), scratch);

     smul(index, scratch, scratch);

     add(scratch, in_bytes(MultiBranchData::case_array_offset()), scratch);

     // Update the case count

     increment_mdp_data_at(scratch,

                           in_bytes(MultiBranchData::relative_count_offset()),

                           scratch2,

                           scratch3);

     // The method data pointer needs to be updated.

     update_mdp_by_offset(scratch,

                      in_bytes(MultiBranchData::relative_displacement_offset()),

                      scratch2);

     bind (profile_continue);

   }

 }

 // add a InterpMonitorElem to stack (see frame_sparc.hpp)

 void InterpreterMacroAssembler::add_monitor_to_stack( bool stack_is_empty,

                                                       Register Rtemp,

                                                       Register Rtemp2 ) {

   Register Rlimit = Lmonitors;

   const jint delta = frame::interpreter_frame_monitor_size() * wordSize;

   assert( (delta & LongAlignmentMask) == 0,

           "sizeof BasicObjectLock must be even number of doublewords");

   sub( SP,        delta, SP);

   sub( Lesp,      delta, Lesp);

   sub( Lmonitors, delta, Lmonitors);

   if (!stack_is_empty) {

     // must copy stack contents down

     Label start_copying, next;

     // untested("monitor stack expansion");

     compute_stack_base(Rtemp);

     ba(start_copying);

     delayed()->cmp(Rtemp, Rlimit); // done? duplicated below

     // note: must copy from low memory upwards

     // On entry to loop,

     // Rtemp points to new base of stack, Lesp points to new end of stack (1 past TOS)

     // Loop mutates Rtemp

     bind( next);

     st_ptr(Rtemp2, Rtemp, 0);

     inc(Rtemp, wordSize);

     cmp(Rtemp, Rlimit); // are we done? (duplicated above)

     bind( start_copying );

     brx( notEqual, true, pn, next );

     delayed()->ld_ptr( Rtemp, delta, Rtemp2 );

     // done copying stack

   }

 }

 // Locals

 void InterpreterMacroAssembler::access_local_ptr( Register index, Register dst ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

   ld_ptr(index, 0, dst);

   // Note:  index must hold the effective address--the iinc template uses it

 }

 // Just like access_local_ptr but the tag is a returnAddress

 void InterpreterMacroAssembler::access_local_returnAddress(Register index,

                                                            Register dst ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

   ld_ptr(index, 0, dst);

 }

 void InterpreterMacroAssembler::access_local_int( Register index, Register dst ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

   ld(index, 0, dst);

   // Note:  index must hold the effective address--the iinc template uses it

 }

 void InterpreterMacroAssembler::access_local_long( Register index, Register dst ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

   // First half stored at index n+1 (which grows down from Llocals[n])

   load_unaligned_long(index, Interpreter::local_offset_in_bytes(1), dst);

 }

 void InterpreterMacroAssembler::access_local_float( Register index, FloatRegister dst ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

   ldf(FloatRegisterImpl::S, index, 0, dst);

 }

 void InterpreterMacroAssembler::access_local_double( Register index, FloatRegister dst ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

   load_unaligned_double(index, Interpreter::local_offset_in_bytes(1), dst);

 }

 #ifdef ASSERT

 void InterpreterMacroAssembler::check_for_regarea_stomp(Register Rindex, int offset, Register Rlimit, Register Rscratch, Register Rscratch1) {

   Label L;

   assert(Rindex != Rscratch, "Registers cannot be same");

   assert(Rindex != Rscratch1, "Registers cannot be same");

   assert(Rlimit != Rscratch, "Registers cannot be same");

   assert(Rlimit != Rscratch1, "Registers cannot be same");

   assert(Rscratch1 != Rscratch, "Registers cannot be same");

   // untested("reg area corruption");

   add(Rindex, offset, Rscratch);

   add(Rlimit, 64 + STACK_BIAS, Rscratch1);

   cmp_and_brx_short(Rscratch, Rscratch1, Assembler::greaterEqualUnsigned, pn, L);

   stop("regsave area is being clobbered");

   bind(L);

 }

 #endif // ASSERT

 void InterpreterMacroAssembler::store_local_int( Register index, Register src ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

   debug_only(check_for_regarea_stomp(index, 0, FP, G1_scratch, G4_scratch);)

   st(src, index, 0);

 }

 void InterpreterMacroAssembler::store_local_ptr( Register index, Register src ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

 #ifdef ASSERT

   check_for_regarea_stomp(index, 0, FP, G1_scratch, G4_scratch);

 #endif

   st_ptr(src, index, 0);

 }

 void InterpreterMacroAssembler::store_local_ptr( int n, Register src ) {

   st_ptr(src, Llocals, Interpreter::local_offset_in_bytes(n));

 }

 void InterpreterMacroAssembler::store_local_long( Register index, Register src ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

 #ifdef ASSERT

   check_for_regarea_stomp(index, Interpreter::local_offset_in_bytes(1), FP, G1_scratch, G4_scratch);

 #endif

   store_unaligned_long(src, index, Interpreter::local_offset_in_bytes(1)); // which is n+1

 }

 void InterpreterMacroAssembler::store_local_float( Register index, FloatRegister src ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

 #ifdef ASSERT

   check_for_regarea_stomp(index, 0, FP, G1_scratch, G4_scratch);

 #endif

   stf(FloatRegisterImpl::S, src, index, 0);

 }

 void InterpreterMacroAssembler::store_local_double( Register index, FloatRegister src ) {

   assert_not_delayed();

   sll(index, Interpreter::logStackElementSize, index);

   sub(Llocals, index, index);

 #ifdef ASSERT

   check_for_regarea_stomp(index, Interpreter::local_offset_in_bytes(1), FP, G1_scratch, G4_scratch);

 #endif

   store_unaligned_double(src, index, Interpreter::local_offset_in_bytes(1));

 }

 int InterpreterMacroAssembler::top_most_monitor_byte_offset() {

   const jint delta = frame::interpreter_frame_monitor_size() * wordSize;

   int rounded_vm_local_words = ::round_to(frame::interpreter_frame_vm_local_words, WordsPerLong);

   return ((-rounded_vm_local_words * wordSize) - delta ) + STACK_BIAS;

 }

 Address InterpreterMacroAssembler::top_most_monitor() {

   return Address(FP, top_most_monitor_byte_offset());

 }

 void InterpreterMacroAssembler::compute_stack_base( Register Rdest ) {

   add( Lesp,      wordSize,                                    Rdest );

 }

 #endif /* CC_INTERP */

 void InterpreterMacroAssembler::get_method_counters(Register method,

                                                     Register Rcounters,

                                                     Label& skip) {

   Label has_counters;

   Address method_counters(method, in_bytes(Method::method_counters_offset()));

   ld_ptr(method_counters, Rcounters);

   br_notnull_short(Rcounters, Assembler::pt, has_counters);

   call_VM(noreg, CAST_FROM_FN_PTR(address,

           InterpreterRuntime::build_method_counters), method);

   ld_ptr(method_counters, Rcounters);

   br_null(Rcounters, false, Assembler::pn, skip); // No MethodCounters, OutOfMemory

   delayed()->nop();

   bind(has_counters);

 }

 void InterpreterMacroAssembler::increment_invocation_counter( Register Rcounters, Register Rtmp, Register Rtmp2 ) {

   assert(UseCompiler, "incrementing must be useful");

   assert_different_registers(Rcounters, Rtmp, Rtmp2);

   Address inv_counter(Rcounters, MethodCounters::invocation_counter_offset() +

                                  InvocationCounter::counter_offset());

   Address be_counter (Rcounters, MethodCounters::backedge_counter_offset() +

                                  InvocationCounter::counter_offset());

   int delta = InvocationCounter::count_increment;

   // Load each counter in a register

   ld( inv_counter, Rtmp );

   ld( be_counter, Rtmp2 );

   assert( is_simm13( delta ), " delta too large.");

   // Add the delta to the invocation counter and store the result

   add( Rtmp, delta, Rtmp );

   // Mask the backedge counter

   and3( Rtmp2, InvocationCounter::count_mask_value, Rtmp2 );

   // Store value

   st( Rtmp, inv_counter);

   // Add invocation counter + backedge counter

   add( Rtmp, Rtmp2, Rtmp);

   // Note that this macro must leave the backedge_count + invocation_count in Rtmp!

 }

 void InterpreterMacroAssembler::increment_backedge_counter( Register Rcounters, Register Rtmp, Register Rtmp2 ) {

   assert(UseCompiler, "incrementing must be useful");

   assert_different_registers(Rcounters, Rtmp, Rtmp2);

   Address be_counter (Rcounters, MethodCounters::backedge_counter_offset() +

                                  InvocationCounter::counter_offset());

   Address inv_counter(Rcounters, MethodCounters::invocation_counter_offset() +

                                  InvocationCounter::counter_offset());

   int delta = InvocationCounter::count_increment;

   // Load each counter in a register

   ld( be_counter, Rtmp );

   ld( inv_counter, Rtmp2 );

   // Add the delta to the backedge counter

   add( Rtmp, delta, Rtmp );

   // Mask the invocation counter, add to backedge counter

   and3( Rtmp2, InvocationCounter::count_mask_value, Rtmp2 );

   // and store the result to memory

   st( Rtmp, be_counter );

   // Add backedge + invocation counter

   add( Rtmp, Rtmp2, Rtmp );

   // Note that this macro must leave backedge_count + invocation_count in Rtmp!

 }

 #ifndef CC_INTERP

 void InterpreterMacroAssembler::test_backedge_count_for_osr( Register backedge_count,

                                                              Register branch_bcp,

                                                              Register Rtmp ) {

   Label did_not_overflow;

   Label overflow_with_error;

   assert_different_registers(backedge_count, Rtmp, branch_bcp);

   assert(UseOnStackReplacement,"Must UseOnStackReplacement to test_backedge_count_for_osr");

   AddressLiteral limit(&InvocationCounter::InterpreterBackwardBranchLimit);

   load_contents(limit, Rtmp);

   cmp_and_br_short(backedge_count, Rtmp, Assembler::lessUnsigned, Assembler::pt, did_not_overflow);

   // When ProfileInterpreter is on, the backedge_count comes from the

   // MethodData*, which value does not get reset on the call to

   // frequency_counter_overflow().  To avoid excessive calls to the overflow

   // routine while the method is being compiled, add a second test to make sure

   // the overflow function is called only once every overflow_frequency.

   if (ProfileInterpreter) {

     const int overflow_frequency = 1024;

     andcc(backedge_count, overflow_frequency-1, Rtmp);

     brx(Assembler::notZero, false, Assembler::pt, did_not_overflow);

     delayed()->nop();

   }

   // overflow in loop, pass branch bytecode

   set(6,Rtmp);

   call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), branch_bcp, Rtmp);

   // Was an OSR adapter generated?

   // O0 = osr nmethod

   br_null_short(O0, Assembler::pn, overflow_with_error);

   // Has the nmethod been invalidated already?

   ld(O0, nmethod::entry_bci_offset(), O2);

   cmp_and_br_short(O2, InvalidOSREntryBci, Assembler::equal, Assembler::pn, overflow_with_error);

   // migrate the interpreter frame off of the stack

   mov(G2_thread, L7);

   // save nmethod

   mov(O0, L6);

   set_last_Java_frame(SP, noreg);

   call_VM_leaf(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_begin), L7);

   reset_last_Java_frame();

   mov(L7, G2_thread);

   // move OSR nmethod to I1

   mov(L6, I1);

   // OSR buffer to I0

   mov(O0, I0);

   // remove the interpreter frame

   restore(I5_savedSP, 0, SP);

   // Jump to the osr code.

   ld_ptr(O1, nmethod::osr_entry_point_offset(), O2);

   jmp(O2, G0);

   delayed()->nop();

   bind(overflow_with_error);

   bind(did_not_overflow);

 }

 void InterpreterMacroAssembler::interp_verify_oop(Register reg, TosState state, const char * file, int line) {

   if (state == atos) { MacroAssembler::_verify_oop(reg, "broken oop ", file, line); }

 }

 // local helper function for the verify_oop_or_return_address macro

 static bool verify_return_address(Method* m, int bci) {

 #ifndef PRODUCT

   address pc = (address)(m->constMethod())

              + in_bytes(ConstMethod::codes_offset()) + bci;

   // assume it is a valid return address if it is inside m and is preceded by a jsr

   if (!m->contains(pc))                                          return false;

   address jsr_pc;

   jsr_pc = pc - Bytecodes::length_for(Bytecodes::_jsr);

   if (*jsr_pc == Bytecodes::_jsr   && jsr_pc >= m->code_base())    return true;

   jsr_pc = pc - Bytecodes::length_for(Bytecodes::_jsr_w);

   if (*jsr_pc == Bytecodes::_jsr_w && jsr_pc >= m->code_base())    return true;

 #endif // PRODUCT

   return false;

 }

 void InterpreterMacroAssembler::verify_oop_or_return_address(Register reg, Register Rtmp) {

   if (!VerifyOops)  return;

   // the VM documentation for the astore[_wide] bytecode allows

   // the TOS to be not only an oop but also a return address

   Label test;

   Label skip;

   // See if it is an address (in the current method):

   mov(reg, Rtmp);

   const int log2_bytecode_size_limit = 16;

   srl(Rtmp, log2_bytecode_size_limit, Rtmp);

   br_notnull_short( Rtmp, pt, test );

   // %%% should use call_VM_leaf here?

   save_frame_and_mov(0, Lmethod, O0, reg, O1);

   save_thread(L7_thread_cache);

   call(CAST_FROM_FN_PTR(address,verify_return_address), relocInfo::none);

   delayed()->nop();

   restore_thread(L7_thread_cache);

   br_notnull( O0, false, pt, skip );

   delayed()->restore();

   // Perform a more elaborate out-of-line call

   // Not an address; verify it:

   bind(test);

   verify_oop(reg);

   bind(skip);

 }

 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) {

   if (state == ftos || state == dtos) MacroAssembler::verify_FPU(stack_depth);

 }

 #endif /* CC_INTERP */

 // Inline assembly for:

 //

 // if (thread is in interp_only_mode) {

 //   InterpreterRuntime::post_method_entry();

 // }

 // if (DTraceMethodProbes) {

 //   SharedRuntime::dtrace_method_entry(method, receiver);

 // }

 // if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) {

 //   SharedRuntime::rc_trace_method_entry(method, receiver);

 // }

 void InterpreterMacroAssembler::notify_method_entry() {

   // C++ interpreter only uses this for native methods.

   // Whenever JVMTI puts a thread in interp_only_mode, method

   // entry/exit events are sent for that thread to track stack

   // depth.  If it is possible to enter interp_only_mode we add

   // the code to check if the event should be sent.

   if (JvmtiExport::can_post_interpreter_events()) {

     Label L;

     Register temp_reg = O5;

     const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());

     ld(interp_only, temp_reg);

     cmp_and_br_short(temp_reg, 0, equal, pt, L);

     call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_entry));

     bind(L);

   }

   {

     Register temp_reg = O5;

     SkipIfEqual skip_if(this, temp_reg, &DTraceMethodProbes, zero);

     call_VM_leaf(noreg,

       CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),

       G2_thread, Lmethod);

   }

   // RedefineClasses() tracing support for obsolete method entry

   if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) {

     call_VM_leaf(noreg,

       CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),

       G2_thread, Lmethod);

   }

 }

 // Inline assembly for:

 //

 // if (thread is in interp_only_mode) {

 //   // save result

 //   InterpreterRuntime::post_method_exit();

 //   // restore result

 // }

 // if (DTraceMethodProbes) {

 //   SharedRuntime::dtrace_method_exit(thread, method);

 // }

 //

 // Native methods have their result stored in d_tmp and l_tmp

 // Java methods have their result stored in the expression stack

 void InterpreterMacroAssembler::notify_method_exit(bool is_native_method,

                                                    TosState state,

                                                    NotifyMethodExitMode mode) {

   // C++ interpreter only uses this for native methods.

   // Whenever JVMTI puts a thread in interp_only_mode, method

   // entry/exit events are sent for that thread to track stack

   // depth.  If it is possible to enter interp_only_mode we add

   // the code to check if the event should be sent.

   if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) {

     Label L;

     Register temp_reg = O5;

     const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());

     ld(interp_only, temp_reg);

     cmp_and_br_short(temp_reg, 0, equal, pt, L);

     // Note: frame::interpreter_frame_result has a dependency on how the

     // method result is saved across the call to post_method_exit. For

     // native methods it assumes the result registers are saved to

     // l_scratch and d_scratch. If this changes then the interpreter_frame_result

     // implementation will need to be updated too.

     save_return_value(state, is_native_method);

     call_VM(noreg,

             CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit));

     restore_return_value(state, is_native_method);

     bind(L);

   }

   {

     Register temp_reg = O5;

     // Dtrace notification

     SkipIfEqual skip_if(this, temp_reg, &DTraceMethodProbes, zero);

     save_return_value(state, is_native_method);

     call_VM_leaf(

       noreg,

       CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),

       G2_thread, Lmethod);

     restore_return_value(state, is_native_method);

   }

 }

 void InterpreterMacroAssembler::save_return_value(TosState state, bool is_native_call) {

 #ifdef CC_INTERP

   // 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

 #else // CC_INTERP

   if (is_native_call) {

     stf(FloatRegisterImpl::D, F0, d_tmp);

 #ifdef _LP64

     stx(O0, l_tmp);

 #else

     std(O0, l_tmp);

 #endif

   } else {

     push(state);

   }

 #endif // CC_INTERP

 }

 void InterpreterMacroAssembler::restore_return_value( TosState state, bool is_native_call) {

 #ifdef CC_INTERP

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

 #ifdef _LP64

   ldx(STATE(_native_lresult), O0);

 #else

   ldd(STATE(_native_lresult), O0);

 #endif

 #else // CC_INTERP

   if (is_native_call) {

     ldf(FloatRegisterImpl::D, d_tmp, F0);

 #ifdef _LP64

     ldx(l_tmp, O0);

 #else

     ldd(l_tmp, O0);

 #endif

   } else {

     pop(state);

   }

 #endif // CC_INTERP

 }

 // Jump if ((*counter_addr += increment) & mask) satisfies the condition.

 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr,

                                                         int increment, int mask,

                                                         Register scratch1, Register scratch2,

                                                         Condition cond, Label *where) {

   ld(counter_addr, scratch1);

   add(scratch1, increment, scratch1);

   if (is_simm13(mask)) {

     andcc(scratch1, mask, G0);

   } else {

     set(mask, scratch2);

     andcc(scratch1, scratch2,  G0);

   }

   br(cond, false, Assembler::pn, *where);

   delayed()->st(scratch1, counter_addr);

 }