Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2012, 2014 SAP AG. All rights reserved.

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

  *

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

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

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

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

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "asm/macroAssembler.inline.hpp"

 #include "interp_masm_ppc_64.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "prims/jvmtiThreadState.hpp"

 #ifdef PRODUCT

 #define BLOCK_COMMENT(str) // nothing

 #else

 #define BLOCK_COMMENT(str) block_comment(str)

 #endif

 void InterpreterMacroAssembler::null_check_throw(Register a, int offset, Register temp_reg) {

 #ifdef CC_INTERP

   address exception_entry = StubRoutines::throw_NullPointerException_at_call_entry();

 #else

   address exception_entry = Interpreter::throw_NullPointerException_entry();

 #endif

   MacroAssembler::null_check_throw(a, offset, temp_reg, exception_entry);

 }

 void InterpreterMacroAssembler::branch_to_entry(address entry, Register Rscratch) {

   assert(entry, "Entry must have been generated by now");

   if (is_within_range_of_b(entry, pc())) {

     b(entry);

   } else {

     load_const_optimized(Rscratch, entry, R0);

     mtctr(Rscratch);

     bctr();

   }

 }

 #ifndef CC_INTERP

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

   Register bytecode = R12_scratch2;

   if (bcp_incr != 0) {

     lbzu(bytecode, bcp_incr, R14_bcp);

   } else {

     lbz(bytecode, 0, R14_bcp);

   }

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

 }

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

   // Load current bytecode.

   Register bytecode = R12_scratch2;

   lbz(bytecode, 0, R14_bcp);

   dispatch_Lbyte_code(state, bytecode, table);

 }

 // 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 R24_dispatch_addr.

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

   Register bytecode = R12_scratch2;

   lbz(bytecode, bcp_incr, R14_bcp);

   load_dispatch_table(R24_dispatch_addr, Interpreter::dispatch_table(state));

   sldi(bytecode, bytecode, LogBytesPerWord);

   ldx(R24_dispatch_addr, R24_dispatch_addr, bytecode);

 }

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

 // own dispatch. The dispatch address in R24_dispatch_addr is used for the

 // dispatch.

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

   mtctr(R24_dispatch_addr);

   addi(R14_bcp, R14_bcp, bcp_incr);

   bctr();

 }

 void InterpreterMacroAssembler::check_and_handle_popframe(Register scratch_reg) {

   assert(scratch_reg != R0, "can't use R0 as scratch_reg here");

   if (JvmtiExport::can_pop_frame()) {

     Label L;

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

     lwz(scratch_reg, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);

     // 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.

     andi_(R0, scratch_reg, JavaThread::popframe_pending_bit);

     beq(CCR0, L);

     andi_(R0, scratch_reg, JavaThread::popframe_processing_bit);

     bne(CCR0, L);

     // Call the Interpreter::remove_activation_preserving_args_entry()

     // func to get the address of the same-named entrypoint in the

     // generated interpreter code.

 #if defined(ABI_ELFv2)

     call_c(CAST_FROM_FN_PTR(address,

                             Interpreter::remove_activation_preserving_args_entry),

            relocInfo::none);

 #else

     call_c(CAST_FROM_FN_PTR(FunctionDescriptor*,

                             Interpreter::remove_activation_preserving_args_entry),

            relocInfo::none);

 #endif

     // Jump to Interpreter::_remove_activation_preserving_args_entry.

     mtctr(R3_RET);

     bctr();

     align(32, 12);

     bind(L);

   }

 }

 void InterpreterMacroAssembler::check_and_handle_earlyret(Register scratch_reg) {

   const Register Rthr_state_addr = scratch_reg;

   if (JvmtiExport::can_force_early_return()) {

     Label Lno_early_ret;

     ld(Rthr_state_addr, in_bytes(JavaThread::jvmti_thread_state_offset()), R16_thread);

     cmpdi(CCR0, Rthr_state_addr, 0);

     beq(CCR0, Lno_early_ret);

     lwz(R0, in_bytes(JvmtiThreadState::earlyret_state_offset()), Rthr_state_addr);

     cmpwi(CCR0, R0, JvmtiThreadState::earlyret_pending);

     bne(CCR0, Lno_early_ret);

     // Jump to Interpreter::_earlyret_entry.

     lwz(R3_ARG1, in_bytes(JvmtiThreadState::earlyret_tos_offset()), Rthr_state_addr);

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

     mtlr(R3_RET);

     blr();

     align(32, 12);

     bind(Lno_early_ret);

   }

 }

 void InterpreterMacroAssembler::load_earlyret_value(TosState state, Register Rscratch1) {

   const Register RjvmtiState = Rscratch1;

   const Register Rscratch2   = R0;

   ld(RjvmtiState, in_bytes(JavaThread::jvmti_thread_state_offset()), R16_thread);

   li(Rscratch2, 0);

   switch (state) {

     case atos: ld(R17_tos, in_bytes(JvmtiThreadState::earlyret_oop_offset()), RjvmtiState);

                std(Rscratch2, in_bytes(JvmtiThreadState::earlyret_oop_offset()), RjvmtiState);

                break;

     case ltos: ld(R17_tos, in_bytes(JvmtiThreadState::earlyret_value_offset()), RjvmtiState);

                break;

     case btos: // fall through

     case ctos: // fall through

     case stos: // fall through

     case itos: lwz(R17_tos, in_bytes(JvmtiThreadState::earlyret_value_offset()), RjvmtiState);

                break;

     case ftos: lfs(F15_ftos, in_bytes(JvmtiThreadState::earlyret_value_offset()), RjvmtiState);

                break;

     case dtos: lfd(F15_ftos, in_bytes(JvmtiThreadState::earlyret_value_offset()), RjvmtiState);

                break;

     case vtos: break;

     default  : ShouldNotReachHere();

   }

   // Clean up tos value in the jvmti thread state.

   std(Rscratch2, in_bytes(JvmtiThreadState::earlyret_value_offset()), RjvmtiState);

   // Set tos state field to illegal value.

   li(Rscratch2, ilgl);

   stw(Rscratch2, in_bytes(JvmtiThreadState::earlyret_tos_offset()), RjvmtiState);

 }

 // Common code to dispatch and dispatch_only.

 // Dispatch value in Lbyte_code and increment Lbcp.

 void InterpreterMacroAssembler::load_dispatch_table(Register dst, address* table) {

   address table_base = (address)Interpreter::dispatch_table((TosState)0);

   intptr_t table_offs = (intptr_t)table - (intptr_t)table_base;

   if (is_simm16(table_offs)) {

     addi(dst, R25_templateTableBase, (int)table_offs);

   } else {

     load_const_optimized(dst, table, R0);

   }

 }

 void InterpreterMacroAssembler::dispatch_Lbyte_code(TosState state, Register bytecode, address* table, bool verify) {

   if (verify) {

     unimplemented("dispatch_Lbyte_code: verify"); // See Sparc Implementation to implement this

   }

 #ifdef FAST_DISPATCH

   unimplemented("dispatch_Lbyte_code FAST_DISPATCH");

 #else

   assert_different_registers(bytecode, R11_scratch1);

   // Calc dispatch table address.

   load_dispatch_table(R11_scratch1, table);

   sldi(R12_scratch2, bytecode, LogBytesPerWord);

   ldx(R11_scratch1, R11_scratch1, R12_scratch2);

   // Jump off!

   mtctr(R11_scratch1);

   bctr();

 #endif

 }

 void InterpreterMacroAssembler::load_receiver(Register Rparam_count, Register Rrecv_dst) {

   sldi(Rrecv_dst, Rparam_count, Interpreter::logStackElementSize);

   ldx(Rrecv_dst, Rrecv_dst, R15_esp);

 }

 // helpers for expression stack

 void InterpreterMacroAssembler::pop_i(Register r) {

   lwzu(r, Interpreter::stackElementSize, R15_esp);

 }

 void InterpreterMacroAssembler::pop_ptr(Register r) {

   ldu(r, Interpreter::stackElementSize, R15_esp);

 }

 void InterpreterMacroAssembler::pop_l(Register r) {

   ld(r, Interpreter::stackElementSize, R15_esp);

   addi(R15_esp, R15_esp, 2 * Interpreter::stackElementSize);

 }

 void InterpreterMacroAssembler::pop_f(FloatRegister f) {

   lfsu(f, Interpreter::stackElementSize, R15_esp);

 }

 void InterpreterMacroAssembler::pop_d(FloatRegister f) {

   lfd(f, Interpreter::stackElementSize, R15_esp);

   addi(R15_esp, R15_esp, 2 * Interpreter::stackElementSize);

 }

 void InterpreterMacroAssembler::push_i(Register r) {

   stw(r, 0, R15_esp);

   addi(R15_esp, R15_esp, - Interpreter::stackElementSize );

 }

 void InterpreterMacroAssembler::push_ptr(Register r) {

   std(r, 0, R15_esp);

   addi(R15_esp, R15_esp, - Interpreter::stackElementSize );

 }

 void InterpreterMacroAssembler::push_l(Register r) {

   std(r, - Interpreter::stackElementSize, R15_esp);

   addi(R15_esp, R15_esp, - 2 * Interpreter::stackElementSize );

 }

 void InterpreterMacroAssembler::push_f(FloatRegister f) {

   stfs(f, 0, R15_esp);

   addi(R15_esp, R15_esp, - Interpreter::stackElementSize );

 }

 void InterpreterMacroAssembler::push_d(FloatRegister f)   {

   stfd(f, - Interpreter::stackElementSize, R15_esp);

   addi(R15_esp, R15_esp, - 2 * Interpreter::stackElementSize );

 }

 void InterpreterMacroAssembler::push_2ptrs(Register first, Register second) {

   std(first, 0, R15_esp);

   std(second, -Interpreter::stackElementSize, R15_esp);

   addi(R15_esp, R15_esp, - 2 * Interpreter::stackElementSize );

 }

 void InterpreterMacroAssembler::push_l_pop_d(Register l, FloatRegister d) {

   std(l, 0, R15_esp);

   lfd(d, 0, R15_esp);

 }

 void InterpreterMacroAssembler::push_d_pop_l(FloatRegister d, Register l) {

   stfd(d, 0, R15_esp);

   ld(l, 0, R15_esp);

 }

 void InterpreterMacroAssembler::push(TosState state) {

   switch (state) {

     case atos: push_ptr();                break;

     case btos:

     case ctos:

     case stos:

     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:

     case ctos:

     case stos:

     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();

   }

   verify_oop(R17_tos, state);

 }

 void InterpreterMacroAssembler::empty_expression_stack() {

   addi(R15_esp, R26_monitor, - Interpreter::stackElementSize);

 }

 void InterpreterMacroAssembler::get_2_byte_integer_at_bcp(int         bcp_offset,

                                                           Register    Rdst,

                                                           signedOrNot is_signed) {

 #if defined(VM_LITTLE_ENDIAN)

   if (bcp_offset) {

     load_const_optimized(Rdst, bcp_offset);

     lhbrx(Rdst, R14_bcp, Rdst);

   } else {

     lhbrx(Rdst, R14_bcp);

   }

   if (is_signed == Signed) {

     extsh(Rdst, Rdst);

   }

 #else

   // Read Java big endian format.

   if (is_signed == Signed) {

     lha(Rdst, bcp_offset, R14_bcp);

   } else {

     lhz(Rdst, bcp_offset, R14_bcp);

   }

 #endif

 }

 void InterpreterMacroAssembler::get_4_byte_integer_at_bcp(int         bcp_offset,

                                                           Register    Rdst,

                                                           signedOrNot is_signed) {

 #if defined(VM_LITTLE_ENDIAN)

   if (bcp_offset) {

     load_const_optimized(Rdst, bcp_offset);

     lwbrx(Rdst, R14_bcp, Rdst);

   } else {

     lwbrx(Rdst, R14_bcp);

   }

   if (is_signed == Signed) {

     extsw(Rdst, Rdst);

   }

 #else

   // Read Java big endian format.

   if (bcp_offset & 3) { // Offset unaligned?

     load_const_optimized(Rdst, bcp_offset);

     if (is_signed == Signed) {

       lwax(Rdst, R14_bcp, Rdst);

     } else {

       lwzx(Rdst, R14_bcp, Rdst);

     }

   } else {

     if (is_signed == Signed) {

       lwa(Rdst, bcp_offset, R14_bcp);

     } else {

       lwz(Rdst, bcp_offset, R14_bcp);

     }

   }

 #endif

 }

 // Load the constant pool cache index from the bytecode stream.

 //

 // Kills / writes:

 //   - Rdst, Rscratch

 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register Rdst, int bcp_offset, size_t index_size) {

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

   // Cache index is always in the native format, courtesy of Rewriter.

   if (index_size == sizeof(u2)) {

     lhz(Rdst, bcp_offset, R14_bcp);

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

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

     if (bcp_offset & 3) {

       load_const_optimized(Rdst, bcp_offset);

       lwax(Rdst, R14_bcp, Rdst);

     } else {

       lwa(Rdst, bcp_offset, R14_bcp);

     }

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

     nand(Rdst, Rdst, Rdst); // convert to plain index

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

     lbz(Rdst, bcp_offset, R14_bcp);

   } else {

     ShouldNotReachHere();

   }

   // Rdst now contains cp cache index.

 }

 void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache, int bcp_offset, size_t index_size) {

   get_cache_index_at_bcp(cache, bcp_offset, index_size);

   sldi(cache, cache, exact_log2(in_words(ConstantPoolCacheEntry::size()) * BytesPerWord));

   add(cache, R27_constPoolCache, cache);

 }

 // Load 4-byte signed or unsigned integer in Java format (that is, big-endian format)

 // from (Rsrc)+offset.

 void InterpreterMacroAssembler::get_u4(Register Rdst, Register Rsrc, int offset,

                                        signedOrNot is_signed) {

 #if defined(VM_LITTLE_ENDIAN)

   if (offset) {

     load_const_optimized(Rdst, offset);

     lwbrx(Rdst, Rdst, Rsrc);

   } else {

     lwbrx(Rdst, Rsrc);

   }

   if (is_signed == Signed) {

     extsw(Rdst, Rdst);

   }

 #else

   if (is_signed == Signed) {

     lwa(Rdst, offset, Rsrc);

   } else {

     lwz(Rdst, offset, Rsrc);

   }

 #endif

 }

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

 void InterpreterMacroAssembler::load_resolved_reference_at_index(Register result, Register index) {

   assert_different_registers(result, index);

   get_constant_pool(result);

   // 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

   sldi(tmp, index, LogBytesPerHeapOop);

   // Load pointer for resolved_references[] objArray.

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

   // JNIHandles::resolve(result)

   ld(result, 0, result);

 #ifdef ASSERT

   Label index_ok;

   lwa(R0, arrayOopDesc::length_offset_in_bytes(), result);

   sldi(R0, R0, LogBytesPerHeapOop);

   cmpd(CCR0, tmp, R0);

   blt(CCR0, index_ok);

   stop("resolved reference index out of bounds", 0x09256);

   bind(index_ok);

 #endif

   // 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 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) {

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

   profile_typecheck(Rsub_klass, Rtmp1, Rtmp2);

   check_klass_subtype(Rsub_klass, Rsuper_klass, Rtmp1, Rtmp2, ok_is_subtype);

   profile_typecheck_failed(Rtmp1, Rtmp2);

 }

 void InterpreterMacroAssembler::generate_stack_overflow_check_with_compare_and_throw(Register Rmem_frame_size, Register Rscratch1) {

   Label done;

   sub(Rmem_frame_size, R1_SP, Rmem_frame_size);

   ld(Rscratch1, thread_(stack_overflow_limit));

   cmpld(CCR0/*is_stack_overflow*/, Rmem_frame_size, Rscratch1);

   bgt(CCR0/*is_stack_overflow*/, done);

   // Load target address of the runtime stub.

   assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "generated in wrong order");

   load_const_optimized(Rscratch1, (StubRoutines::throw_StackOverflowError_entry()), R0);

   mtctr(Rscratch1);

   // Restore caller_sp.

 #ifdef ASSERT

   ld(Rscratch1, 0, R1_SP);

   ld(R0, 0, R21_sender_SP);

   cmpd(CCR0, R0, Rscratch1);

   asm_assert_eq("backlink", 0x547);

 #endif // ASSERT

   mr(R1_SP, R21_sender_SP);

   bctr();

   align(32, 12);

   bind(done);

 }

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

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

 // 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 Rarray, Register Rindex, int index_shift, Register Rtmp, Register Rres) {

   // 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.

   // Kills:

   //   - Rindex

   // Writes:

   //   - Rres: Address that corresponds to the array index if check was successful.

   verify_oop(Rarray);

   const Register Rlength   = R0;

   const Register RsxtIndex = Rtmp;

   Label LisNull, LnotOOR;

   // Array nullcheck

   if (!ImplicitNullChecks) {

     cmpdi(CCR0, Rarray, 0);

     beq(CCR0, LisNull);

   } else {

     null_check_throw(Rarray, arrayOopDesc::length_offset_in_bytes(), /*temp*/RsxtIndex);

   }

   // Rindex might contain garbage in upper bits (remember that we don't sign extend

   // during integer arithmetic operations). So kill them and put value into same register

   // where ArrayIndexOutOfBounds would expect the index in.

   rldicl(RsxtIndex, Rindex, 0, 32); // zero extend 32 bit -> 64 bit

   // Index check

   lwz(Rlength, arrayOopDesc::length_offset_in_bytes(), Rarray);

   cmplw(CCR0, Rindex, Rlength);

   sldi(RsxtIndex, RsxtIndex, index_shift);

   blt(CCR0, LnotOOR);

   // Index should be in R17_tos, array should be in R4_ARG2.

   mr(R17_tos, Rindex);

   mr(R4_ARG2, Rarray);

   load_dispatch_table(Rtmp, (address*)Interpreter::_throw_ArrayIndexOutOfBoundsException_entry);

   mtctr(Rtmp);

   bctr();

   if (!ImplicitNullChecks) {

     bind(LisNull);

     load_dispatch_table(Rtmp, (address*)Interpreter::_throw_NullPointerException_entry);

     mtctr(Rtmp);

     bctr();

   }

   align(32, 16);

   bind(LnotOOR);

   // Calc address

   add(Rres, RsxtIndex, Rarray);

 }

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

   // pop array

   pop_ptr(array);

   // check array

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

 }

 void InterpreterMacroAssembler::get_const(Register Rdst) {

   ld(Rdst, in_bytes(Method::const_offset()), R19_method);

 }

 void InterpreterMacroAssembler::get_constant_pool(Register Rdst) {

   get_const(Rdst);

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

 }

 void InterpreterMacroAssembler::get_constant_pool_cache(Register Rdst) {

   get_constant_pool(Rdst);

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

 }

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

   get_constant_pool(Rcpool);

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

 }

 // Unlock if synchronized method.

 //

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

 // Unlock any Java monitors from synchronized 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 Lunlocked, Lno_unlock;

   {

     Register Rdo_not_unlock_flag = R11_scratch1;

     Register Raccess_flags       = R12_scratch2;

     // Check if synchronized method or unlocking prevented by

     // JavaThread::do_not_unlock_if_synchronized flag.

     lbz(Rdo_not_unlock_flag, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);

     lwz(Raccess_flags, in_bytes(Method::access_flags_offset()), R19_method);

     li(R0, 0);

     stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread); // reset flag

     push(state);

     // Skip if we don't have to unlock.

     rldicl_(R0, Raccess_flags, 64-JVM_ACC_SYNCHRONIZED_BIT, 63); // Extract bit and compare to 0.

     beq(CCR0, Lunlocked);

     cmpwi(CCR0, Rdo_not_unlock_flag, 0);

     bne(CCR0, Lno_unlock);

   }

   // Unlock

   {

     Register Rmonitor_base = R11_scratch1;

     Label Lunlock;

     // If it's still locked, everything is ok, unlock it.

     ld(Rmonitor_base, 0, R1_SP);

     addi(Rmonitor_base, Rmonitor_base, - (frame::ijava_state_size + frame::interpreter_frame_monitor_size_in_bytes())); // Monitor base

     ld(R0, BasicObjectLock::obj_offset_in_bytes(), Rmonitor_base);

     cmpdi(CCR0, R0, 0);

     bne(CCR0, Lunlock);

     // If it's already unlocked, throw exception.

     if (throw_monitor_exception) {

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

       should_not_reach_here();

     } else {

       if (install_monitor_exception) {

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

         b(Lunlocked);

       }

     }

     bind(Lunlock);

     unlock_object(Rmonitor_base);

   }

   // Check that all other monitors are unlocked. Throw IllegelMonitorState exception if not.

   bind(Lunlocked);

   {

     Label Lexception, Lrestart;

     Register Rcurrent_obj_addr = R11_scratch1;

     const int delta = frame::interpreter_frame_monitor_size_in_bytes();

     assert((delta & LongAlignmentMask) == 0, "sizeof BasicObjectLock must be even number of doublewords");

     bind(Lrestart);

     // Set up search loop: Calc num of iterations.

     {

       Register Riterations = R12_scratch2;

       Register Rmonitor_base = Rcurrent_obj_addr;

       ld(Rmonitor_base, 0, R1_SP);

       addi(Rmonitor_base, Rmonitor_base, - frame::ijava_state_size);  // Monitor base

       subf_(Riterations, R26_monitor, Rmonitor_base);

       ble(CCR0, Lno_unlock);

       addi(Rcurrent_obj_addr, Rmonitor_base, BasicObjectLock::obj_offset_in_bytes() - frame::interpreter_frame_monitor_size_in_bytes());

       // Check if any monitor is on stack, bail out if not

       srdi(Riterations, Riterations, exact_log2(delta));

       mtctr(Riterations);

     }

     // The search loop: Look for locked monitors.

     {

       const Register Rcurrent_obj = R0;

       Label Lloop;

       ld(Rcurrent_obj, 0, Rcurrent_obj_addr);

       addi(Rcurrent_obj_addr, Rcurrent_obj_addr, -delta);

       bind(Lloop);

       // Check if current entry is used.

       cmpdi(CCR0, Rcurrent_obj, 0);

       bne(CCR0, Lexception);

       // Preload next iteration's compare value.

       ld(Rcurrent_obj, 0, Rcurrent_obj_addr);

       addi(Rcurrent_obj_addr, Rcurrent_obj_addr, -delta);

       bdnz(Lloop);

     }

     // Fell through: Everything's unlocked => finish.

     b(Lno_unlock);

     // An object is still locked => need to throw exception.

     bind(Lexception);

     if (throw_monitor_exception) {

       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.

       Register Rmonitor_addr = R11_scratch1;

       addi(Rmonitor_addr, Rcurrent_obj_addr, -BasicObjectLock::obj_offset_in_bytes() + delta);

       unlock_object(Rmonitor_addr);

       if (install_monitor_exception) {

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

       }

       b(Lrestart);

     }

   }

   align(32, 12);

   bind(Lno_unlock);

   pop(state);

 }

 // Support function for remove_activation & Co.

 void InterpreterMacroAssembler::merge_frames(Register Rsender_sp, Register return_pc, Register Rscratch1, Register Rscratch2) {

   // Pop interpreter frame.

   ld(Rscratch1, 0, R1_SP); // *SP

   ld(Rsender_sp, _ijava_state_neg(sender_sp), Rscratch1); // top_frame_sp

   ld(Rscratch2, 0, Rscratch1); // **SP

 #ifdef ASSERT

   {

     Label Lok;

     ld(R0, _ijava_state_neg(ijava_reserved), Rscratch1);

     cmpdi(CCR0, R0, 0x5afe);

     beq(CCR0, Lok);

     stop("frame corrupted (remove activation)", 0x5afe);

     bind(Lok);

   }

 #endif

   if (return_pc!=noreg) {

     ld(return_pc, _abi(lr), Rscratch1); // LR

   }

   // Merge top frames.

   subf(Rscratch1, R1_SP, Rsender_sp); // top_frame_sp - SP

   stdux(Rscratch2, R1_SP, Rscratch1); // atomically set *(SP = top_frame_sp) = **SP

 }

 // Remove activation.

 //

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

 // Unlock any Java monitors from synchronized 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, true);

   verify_oop(R17_tos, state);

   verify_thread();

   merge_frames(/*top_frame_sp*/ R21_sender_SP, /*return_pc*/ R0, R11_scratch1, R12_scratch2);

   mtlr(R0);

 }

 #endif // !CC_INTERP

 // Lock object

 //

 // Registers alive

 //   monitor - Address of the BasicObjectLock to be used for locking,

 //             which must be initialized with the object to lock.

 //   object  - Address of the object to be locked.

 //

 void InterpreterMacroAssembler::lock_object(Register monitor, Register object) {

   if (UseHeavyMonitors) {

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

             monitor, /*check_for_exceptions=*/true CC_INTERP_ONLY(&& false));

   } else {

     // template code:

     //

     // markOop displaced_header = obj->mark().set_unlocked();

     // monitor->lock()->set_displaced_header(displaced_header);

     // if (Atomic::cmpxchg_ptr(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) {

     //   // We stored the monitor address into the object's mark word.

     // } else if (THREAD->is_lock_owned((address)displaced_header))

     //   // Simple recursive case.

     //   monitor->lock()->set_displaced_header(NULL);

     // } else {

     //   // Slow path.

     //   InterpreterRuntime::monitorenter(THREAD, monitor);

     // }

     const Register displaced_header = R7_ARG5;

     const Register object_mark_addr = R8_ARG6;

     const Register current_header   = R9_ARG7;

     const Register tmp              = R10_ARG8;

     Label done;

     Label cas_failed, slow_case;

     assert_different_registers(displaced_header, object_mark_addr, current_header, tmp);

     // markOop displaced_header = obj->mark().set_unlocked();

     // Load markOop from object into displaced_header.

     ld(displaced_header, oopDesc::mark_offset_in_bytes(), object);

     if (UseBiasedLocking) {

       biased_locking_enter(CCR0, object, displaced_header, tmp, current_header, done, &slow_case);

     }

     // Set displaced_header to be (markOop of object | UNLOCK_VALUE).

     ori(displaced_header, displaced_header, markOopDesc::unlocked_value);

     // monitor->lock()->set_displaced_header(displaced_header);

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

     std(displaced_header, BasicObjectLock::lock_offset_in_bytes() +

         BasicLock::displaced_header_offset_in_bytes(), monitor);

     // if (Atomic::cmpxchg_ptr(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) {

     // Store stack address of the BasicObjectLock (this is monitor) into object.

     addi(object_mark_addr, object, oopDesc::mark_offset_in_bytes());

     // Must fence, otherwise, preceding store(s) may float below cmpxchg.

     // CmpxchgX sets CCR0 to cmpX(current, displaced).

     fence(); // TODO: replace by MacroAssembler::MemBarRel | MacroAssembler::MemBarAcq ?

     cmpxchgd(/*flag=*/CCR0,

              /*current_value=*/current_header,

              /*compare_value=*/displaced_header, /*exchange_value=*/monitor,

              /*where=*/object_mark_addr,

              MacroAssembler::MemBarRel | MacroAssembler::MemBarAcq,

              MacroAssembler::cmpxchgx_hint_acquire_lock(),

              noreg,

              &cas_failed);

     // If the compare-and-exchange succeeded, then we found an unlocked

     // object and we have now locked it.

     b(done);

     bind(cas_failed);

     // } else if (THREAD->is_lock_owned((address)displaced_header))

     //   // Simple recursive case.

     //   monitor->lock()->set_displaced_header(NULL);

     // 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

     // (current_header) with the stack pointer.

     sub(current_header, current_header, R1_SP);

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

     load_const_optimized(tmp,

                          (address) (~(os::vm_page_size()-1) |

                                     markOopDesc::lock_mask_in_place));

     and_(R0/*==0?*/, current_header, tmp);

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

     // header indicating it is a recursive lock.

     bne(CCR0, slow_case);

     release();

     std(R0/*==0!*/, BasicObjectLock::lock_offset_in_bytes() +

         BasicLock::displaced_header_offset_in_bytes(), monitor);

     b(done);

     // } else {

     //   // Slow path.

     //   InterpreterRuntime::monitorenter(THREAD, monitor);

     // 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),

             monitor, /*check_for_exceptions=*/true CC_INTERP_ONLY(&& false));

     // }

     align(32, 12);

     bind(done);

   }

 }

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

 //

 // Registers alive

 //   monitor - Address of the BasicObjectLock to be used for locking,

 //             which must be initialized with the object to lock.

 //

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

 void InterpreterMacroAssembler::unlock_object(Register monitor, bool check_for_exceptions) {

   if (UseHeavyMonitors) {

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

             monitor, check_for_exceptions CC_INTERP_ONLY(&& false));

   } else {

     // template code:

     //

     // if ((displaced_header = monitor->displaced_header()) == NULL) {

     //   // Recursive unlock. Mark the monitor unlocked by setting the object field to NULL.

     //   monitor->set_obj(NULL);

     // } else if (Atomic::cmpxchg_ptr(displaced_header, obj->mark_addr(), monitor) == monitor) {

     //   // We swapped the unlocked mark in displaced_header into the object's mark word.

     //   monitor->set_obj(NULL);

     // } else {

     //   // Slow path.

     //   InterpreterRuntime::monitorexit(THREAD, monitor);

     // }

     const Register object           = R7_ARG5;

     const Register displaced_header = R8_ARG6;

     const Register object_mark_addr = R9_ARG7;

     const Register current_header   = R10_ARG8;

     Label free_slot;

     Label slow_case;

     assert_different_registers(object, displaced_header, object_mark_addr, current_header);

     if (UseBiasedLocking) {

       // The object address from the monitor is in object.

       ld(object, BasicObjectLock::obj_offset_in_bytes(), monitor);

       assert(oopDesc::mark_offset_in_bytes() == 0, "offset of _mark is not 0");

       biased_locking_exit(CCR0, object, displaced_header, free_slot);

     }

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

     ld(displaced_header, BasicObjectLock::lock_offset_in_bytes() +

            BasicLock::displaced_header_offset_in_bytes(), monitor);

     // If the displaced header is zero, we have a recursive unlock.

     cmpdi(CCR0, displaced_header, 0);

     beq(CCR0, free_slot); // recursive unlock

     // } else if (Atomic::cmpxchg_ptr(displaced_header, obj->mark_addr(), monitor) == monitor) {

     //   // We swapped the unlocked mark in displaced_header into the object's mark word.

     //   monitor->set_obj(NULL);

     // If we still have a lightweight lock, unlock the object and be done.

     // The object address from the monitor is in object.

     if (!UseBiasedLocking) { ld(object, BasicObjectLock::obj_offset_in_bytes(), monitor); }

     addi(object_mark_addr, object, oopDesc::mark_offset_in_bytes());

     // We have the displaced header in displaced_header. If the lock is still

     // lightweight, it will contain the monitor address and we'll store the

     // displaced header back into the object's mark word.

     // CmpxchgX sets CCR0 to cmpX(current, monitor).

     cmpxchgd(/*flag=*/CCR0,

              /*current_value=*/current_header,

              /*compare_value=*/monitor, /*exchange_value=*/displaced_header,

              /*where=*/object_mark_addr,

              MacroAssembler::MemBarRel,

              MacroAssembler::cmpxchgx_hint_release_lock(),

              noreg,

              &slow_case);

     b(free_slot);

     // } else {

     //   // Slow path.

     //   InterpreterRuntime::monitorexit(THREAD, monitor);

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

     // we need to get into the slow case.

     bind(slow_case);

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

             monitor, check_for_exceptions CC_INTERP_ONLY(&& false));

     // }

     Label done;

     b(done); // Monitor register may be overwritten! Runtime has already freed the slot.

     // Exchange worked, do monitor->set_obj(NULL);

     align(32, 12);

     bind(free_slot);

     li(R0, 0);

     std(R0, BasicObjectLock::obj_offset_in_bytes(), monitor);

     bind(done);

   }

 }

 #ifndef CC_INTERP

 // 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.

 //

 // Input:

 //   - Rtarget_method: method to call

 //   - Rret_addr:      return address

 //   - 2 scratch regs

 //

 void InterpreterMacroAssembler::call_from_interpreter(Register Rtarget_method, Register Rret_addr, Register Rscratch1, Register Rscratch2) {

   assert_different_registers(Rscratch1, Rscratch2, Rtarget_method, Rret_addr);

   // Assume we want to go compiled if available.

   const Register Rtarget_addr = Rscratch1;

   const Register Rinterp_only = Rscratch2;

   ld(Rtarget_addr, in_bytes(Method::from_interpreted_offset()), Rtarget_method);

   if (JvmtiExport::can_post_interpreter_events()) {

     lwz(Rinterp_only, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);

     // 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.

     Label done;

     verify_thread();

     cmpwi(CCR0, Rinterp_only, 0);

     beq(CCR0, done);

     ld(Rtarget_addr, in_bytes(Method::interpreter_entry_offset()), Rtarget_method);

     align(32, 12);

     bind(done);

   }

 #ifdef ASSERT

   {

     Label Lok;

     cmpdi(CCR0, Rtarget_addr, 0);

     bne(CCR0, Lok);

     stop("null entry point");

     bind(Lok);

   }

 #endif // ASSERT

   mr(R21_sender_SP, R1_SP);

   // Calc a precise SP for the call. The SP value we calculated in

   // generate_fixed_frame() is based on the max_stack() value, so we would waste stack space

   // if esp is not max. Also, the i2c adapter extends the stack space without restoring

   // our pre-calced value, so repeating calls via i2c would result in stack overflow.

   // Since esp already points to an empty slot, we just have to sub 1 additional slot

   // to meet the abi scratch requirements.

   // The max_stack pointer will get restored by means of the GR_Lmax_stack local in

   // the return entry of the interpreter.

   addi(Rscratch2, R15_esp, Interpreter::stackElementSize - frame::abi_reg_args_size);

   clrrdi(Rscratch2, Rscratch2, exact_log2(frame::alignment_in_bytes)); // round towards smaller address

   resize_frame_absolute(Rscratch2, Rscratch2, R0);

   mr_if_needed(R19_method, Rtarget_method);

   mtctr(Rtarget_addr);

   mtlr(Rret_addr);

   save_interpreter_state(Rscratch2);

 #ifdef ASSERT

   ld(Rscratch1, _ijava_state_neg(top_frame_sp), Rscratch2); // Rscratch2 contains fp

   cmpd(CCR0, R21_sender_SP, Rscratch1);

   asm_assert_eq("top_frame_sp incorrect", 0x951);

 #endif

   bctr();

 }

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

 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {

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

   Label get_continue;

   ld(R28_mdx, in_bytes(Method::method_data_offset()), R19_method);

   test_method_data_pointer(get_continue);

   call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), R19_method, R14_bcp);

   addi(R28_mdx, R28_mdx, in_bytes(MethodData::data_offset()));

   add(R28_mdx, R28_mdx, R3_RET);

   bind(get_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");

   cmpdi(CCR0, R28_mdx, 0);

   beq(CCR0, 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.

   lhz(R11_scratch1, in_bytes(DataLayout::bci_offset()), R28_mdx);

   ld(R12_scratch2, in_bytes(Method::const_offset()), R19_method);

   addi(R11_scratch1, R11_scratch1, in_bytes(ConstMethod::codes_offset()));

   add(R11_scratch1, R12_scratch2, R12_scratch2);

   cmpd(CCR0, R11_scratch1, R14_bcp);

   beq(CCR0, verify_continue);

   call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp ), R19_method, R14_bcp, R28_mdx);

   bind(verify_continue);

 #endif

 }

 void InterpreterMacroAssembler::test_invocation_counter_for_mdp(Register invocation_count,

                                                                 Register Rscratch,

                                                                 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.

   int ipl_offs = load_const_optimized(Rscratch, &InvocationCounter::InterpreterProfileLimit, R0, true);

   lwz(Rscratch, ipl_offs, Rscratch);

   cmpdi(CCR0, R28_mdx, 0);

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

   cmpd(CCR1, Rscratch /* InterpreterProfileLimit */, invocation_count);

   bne(CCR0, done);

   bge(CCR1, profile_continue);

   // Build it now.

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

   set_method_data_pointer_for_bcp();

   b(profile_continue);

   align(32, 12);

   bind(done);

 }

 void InterpreterMacroAssembler::test_backedge_count_for_osr(Register backedge_count, Register branch_bcp, Register Rtmp) {

   assert_different_registers(backedge_count, Rtmp, branch_bcp);

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

   Label did_not_overflow;

   Label overflow_with_error;

   int ibbl_offs = load_const_optimized(Rtmp, &InvocationCounter::InterpreterBackwardBranchLimit, R0, true);

   lwz(Rtmp, ibbl_offs, Rtmp);

   cmpw(CCR0, backedge_count, Rtmp);

   blt(CCR0, did_not_overflow);

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

   // methodDataOop, 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;

     li(Rtmp, overflow_frequency-1);

     andr(Rtmp, Rtmp, backedge_count);

     cmpwi(CCR0, Rtmp, 0);

     bne(CCR0, did_not_overflow);

   }

   // Overflow in loop, pass branch bytecode.

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

   // Was an OSR adapter generated?

   // O0 = osr nmethod

   cmpdi(CCR0, R3_RET, 0);

   beq(CCR0, overflow_with_error);

   // Has the nmethod been invalidated already?

   lwz(Rtmp, nmethod::entry_bci_offset(), R3_RET);

   cmpwi(CCR0, Rtmp, InvalidOSREntryBci);

   beq(CCR0, overflow_with_error);

   // Migrate the interpreter frame off of the stack.

   // We can use all registers because we will not return to interpreter from this point.

   // Save nmethod.

   const Register osr_nmethod = R31;

   mr(osr_nmethod, R3_RET);

   set_top_ijava_frame_at_SP_as_last_Java_frame(R1_SP, R11_scratch1);

   call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_begin), R16_thread);

   reset_last_Java_frame();

   // OSR buffer is in ARG1

   // Remove the interpreter frame.

   merge_frames(/*top_frame_sp*/ R21_sender_SP, /*return_pc*/ R0, R11_scratch1, R12_scratch2);

   // Jump to the osr code.

   ld(R11_scratch1, nmethod::osr_entry_point_offset(), osr_nmethod);

   mtlr(R0);

   mtctr(R11_scratch1);

   bctr();

   align(32, 12);

   bind(overflow_with_error);

   bind(did_not_overflow);

 }

 // 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");

   std(value, constant, R28_mdx);

 }

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

 void InterpreterMacroAssembler::increment_mdp_data_at(int constant,

                                                       Register counter_addr,

                                                       Register Rbumped_count,

                                                       bool decrement) {

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

   addi(counter_addr, R28_mdx, constant);

   increment_mdp_data_at(counter_addr, Rbumped_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 scratch,

                                                       Register Rbumped_count,

                                                       bool decrement) {

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

   add(scratch, R28_mdx, reg);

   // Then calculate the counter address.

   addi(scratch, scratch, constant);

   increment_mdp_data_at(scratch, Rbumped_count, decrement);

 }

 void InterpreterMacroAssembler::increment_mdp_data_at(Register counter_addr,

                                                       Register Rbumped_count,

                                                       bool decrement) {

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

   // Load the counter.

   ld(Rbumped_count, 0, counter_addr);

   if (decrement) {

     // Decrement the register. Set condition codes.

     addi(Rbumped_count, Rbumped_count, - DataLayout::counter_increment);

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

     std(Rbumped_count, 0, counter_addr);

     // Note: add/sub overflow check are not ported, since 64 bit

     // calculation should never overflow.

   } else {

     // Increment the register. Set carry flag.

     addi(Rbumped_count, Rbumped_count, DataLayout::counter_increment);

     // Store the incremented counter.

     std(Rbumped_count, 0, counter_addr);

   }

 }

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

 void InterpreterMacroAssembler::set_mdp_flag_at(int flag_constant,

                                                 Register scratch) {

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

   // Load the data header.

   lbz(scratch, in_bytes(DataLayout::flags_offset()), R28_mdx);

   // Set the flag.

   ori(scratch, scratch, flag_constant);

   // Store the modified header.

   stb(scratch, in_bytes(DataLayout::flags_offset()), R28_mdx);

 }

 // 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.

 void InterpreterMacroAssembler::test_mdp_data_at(int offset,

                                                  Register value,

                                                  Label& not_equal_continue,

                                                  Register test_out) {

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

   ld(test_out, offset, R28_mdx);

   cmpd(CCR0,  value, test_out);

   bne(CCR0, not_equal_continue);

 }

 // 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(scratch, offset_of_disp, R28_mdx);

   add(R28_mdx, scratch, R28_mdx);

 }

 // 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(scratch, reg, R28_mdx);

   ld(scratch, offset_of_disp, scratch);

   add(R28_mdx, scratch, R28_mdx);

 }

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

 void InterpreterMacroAssembler::update_mdp_by_constant(int constant) {

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

   addi(R28_mdx, R28_mdx, constant);

 }

 // 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);

   assert(return_bci->is_nonvolatile(), "need to protect return_bci");

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

   pop(state);

 }

 // Increments the backedge counter.

 // Returns backedge counter + invocation counter in Rdst.

 void InterpreterMacroAssembler::increment_backedge_counter(const Register Rcounters, const Register Rdst,

                                                            const Register Rtmp1, Register Rscratch) {

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

   assert_different_registers(Rdst, Rtmp1);

   const Register invocation_counter = Rtmp1;

   const Register counter = Rdst;

   // TODO ppc port assert(4 == InvocationCounter::sz_counter(), "unexpected field size.");

   // Load backedge counter.

   lwz(counter, in_bytes(MethodCounters::backedge_counter_offset()) +

                in_bytes(InvocationCounter::counter_offset()), Rcounters);

   // Load invocation counter.

   lwz(invocation_counter, in_bytes(MethodCounters::invocation_counter_offset()) +

                           in_bytes(InvocationCounter::counter_offset()), Rcounters);

   // Add the delta to the backedge counter.

   addi(counter, counter, InvocationCounter::count_increment);

   // Mask the invocation counter.

   li(Rscratch, InvocationCounter::count_mask_value);

   andr(invocation_counter, invocation_counter, Rscratch);

   // Store new counter value.

   stw(counter, in_bytes(MethodCounters::backedge_counter_offset()) +

                in_bytes(InvocationCounter::counter_offset()), Rcounters);

   // Return invocation counter + backedge counter.

   add(counter, counter, invocation_counter);

 }

 // 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()), scratch, 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 scratch1, Register scratch2) {

   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()), scratch1, scratch2);

     // 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 scratch1, Register scratch2) {

   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()), scratch1, scratch2);

     // 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 scratch1, Register scratch2) {

   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()), scratch1, scratch2);

     // 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 Rreceiver,

                                                      Register Rscratch1,

                                                      Register Rscratch2,

                                                      bool receiver_can_be_null) {

   if (!ProfileInterpreter) { return; }

   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;

     cmpdi(CCR0, Rreceiver, 0);

     bne(CCR0, not_null);

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

     increment_mdp_data_at(in_bytes(CounterData::count_offset()), Rscratch1, Rscratch2);

     b(skip_receiver_profile);

     bind(not_null);

   }

   // Record the receiver type.

   record_klass_in_profile(Rreceiver, Rscratch1, Rscratch2, 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::profile_typecheck(Register Rklass, Register Rscratch1, Register Rscratch2) {

   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(Rklass, Rscratch1, Rscratch2, false);

     }

     // The method data pointer needs to be updated.

     update_mdp_by_constant(mdp_delta);

     bind (profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_typecheck_failed(Register Rscratch1, Register Rscratch2) {

   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, Rscratch1, Rscratch2, true);

     bind (profile_continue);

   }

 }

 // Count a ret in the bytecodes.

 void InterpreterMacroAssembler::profile_ret(TosState state, Register return_bci, Register scratch1, Register scratch2) {

   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()), scratch1, scratch2 );

     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, scratch1);

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

       increment_mdp_data_at(in_bytes(RetData::bci_count_offset(row)), scratch1, scratch2);

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

       update_mdp_by_offset(in_bytes(RetData::bci_displacement_offset(row)), scratch1);

       b(profile_continue);

       bind(next_test);

     }

     update_mdp_for_ret(state, return_bci);

     bind (profile_continue);

   }

 }

 // Count the default case of a switch construct.

 void InterpreterMacroAssembler::profile_switch_default(Register scratch1,  Register scratch2) {

   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()),

                           scratch1, scratch2);

     // The method data pointer needs to be updated.

     update_mdp_by_offset(in_bytes(MultiBranchData::default_displacement_offset()),

                          scratch1);

     bind (profile_continue);

   }

 }

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

 void InterpreterMacroAssembler::profile_switch_case(Register index,

                                                     Register scratch1,

                                                     Register scratch2,

                                                     Register scratch3) {

   if (ProfileInterpreter) {

     assert_different_registers(index, scratch1, scratch2, scratch3);

     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().

     li(scratch3, in_bytes(MultiBranchData::case_array_offset()));

     assert (in_bytes(MultiBranchData::per_case_size()) == 16, "so that shladd works");

     sldi(scratch1, index, exact_log2(in_bytes(MultiBranchData::per_case_size())));

     add(scratch1, scratch1, scratch3);

     // Update the case count.

     increment_mdp_data_at(scratch1, in_bytes(MultiBranchData::relative_count_offset()), scratch2, scratch3);

     // The method data pointer needs to be updated.

     update_mdp_by_offset(scratch1, in_bytes(MultiBranchData::relative_displacement_offset()), scratch2);

     bind (profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_null_seen(Register Rscratch1, Register Rscratch2) {

   if (ProfileInterpreter) {

     assert_different_registers(Rscratch1, Rscratch2);

     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(), Rscratch1);

     // 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::record_klass_in_profile(Register Rreceiver,

                                                         Register Rscratch1, Register Rscratch2,

                                                         bool is_virtual_call) {

   assert(ProfileInterpreter, "must be profiling");

   assert_different_registers(Rreceiver, Rscratch1, Rscratch2);

   Label done;

   record_klass_in_profile_helper(Rreceiver, Rscratch1, Rscratch2, 0, done, is_virtual_call);

   bind (done);

 }

 void InterpreterMacroAssembler::record_klass_in_profile_helper(

                                         Register receiver, Register scratch1, Register scratch2,

                                         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()), scratch1, scratch2);

     }

     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, scratch1);

     // 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, scratch1, scratch2);

     b(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) {

           // Scratch1 contains test_out from test_mdp_data_at.

           cmpdi(CCR0, scratch1, 0);

           beq(CCR0, found_null);

           // 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()), scratch1, scratch2);

           b(done);

           bind(found_null);

         } else {

           cmpdi(CCR0, scratch1, 0);

           bne(CCR0, done);

         }

         break;

       }

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

       cmpdi(CCR0, scratch1, 0);

       beq(CCR0, found_null);

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

       record_klass_in_profile_helper(receiver, scratch1, scratch2, 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));

   li(scratch1, DataLayout::counter_increment);

   set_mdp_data_at(count_offset, scratch1);

   if (start_row > 0) {

     b(done);

   }

 }

 // Argument and return type profilig.

 // kills: tmp, tmp2, R0, CR0, CR1

 void InterpreterMacroAssembler::profile_obj_type(Register obj, Register mdo_addr_base,

                                                  RegisterOrConstant mdo_addr_offs, Register tmp, Register tmp2) {

   Label do_nothing, do_update;

   // tmp2 = obj is allowed

   assert_different_registers(obj, mdo_addr_base, tmp, R0);

   assert_different_registers(tmp2, mdo_addr_base, tmp, R0);

   const Register klass = tmp2;

   verify_oop(obj);

   ld(tmp, mdo_addr_offs, mdo_addr_base);

   // Set null_seen if obj is 0.

   cmpdi(CCR0, obj, 0);

   ori(R0, tmp, TypeEntries::null_seen);

   beq(CCR0, do_update);

   load_klass(klass, obj);

   clrrdi(R0, tmp, exact_log2(-TypeEntries::type_klass_mask));

   // Basically same as andi(R0, tmp, TypeEntries::type_klass_mask);

   cmpd(CCR1, R0, klass);

   // Klass seen before, nothing to do (regardless of unknown bit).

   //beq(CCR1, do_nothing);

   andi_(R0, klass, TypeEntries::type_unknown);

   // Already unknown. Nothing to do anymore.

   //bne(CCR0, do_nothing);

   crorc(/*CCR0 eq*/2, /*CCR1 eq*/4+2, /*CCR0 eq*/2); // cr0 eq = cr1 eq or cr0 ne

   beq(CCR0, do_nothing);

   clrrdi_(R0, tmp, exact_log2(-TypeEntries::type_mask));

   orr(R0, klass, tmp); // Combine klass and null_seen bit (only used if (tmp & type_mask)==0).

   beq(CCR0, do_update); // First time here. Set profile type.

   // Different than before. Cannot keep accurate profile.

   ori(R0, tmp, TypeEntries::type_unknown);

   bind(do_update);

   // update profile

   std(R0, mdo_addr_offs, mdo_addr_base);

   align(32, 12);

   bind(do_nothing);

 }

 void InterpreterMacroAssembler::profile_arguments_type(Register callee, Register tmp1, Register tmp2, bool is_virtual) {

   if (!ProfileInterpreter) {

     return;

   }

   assert_different_registers(callee, tmp1, tmp2, R28_mdx);

   if (MethodData::profile_arguments() || MethodData::profile_return()) {

     Label profile_continue;

     test_method_data_pointer(profile_continue);

     int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size());

     lbz(tmp1, in_bytes(DataLayout::tag_offset()) - off_to_start, R28_mdx);

     cmpwi(CCR0, tmp1, is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag);

     bne(CCR0, profile_continue);

     if (MethodData::profile_arguments()) {

       Label done;

       int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset());

       add(R28_mdx, off_to_args, R28_mdx);

       for (int i = 0; i < TypeProfileArgsLimit; i++) {

         if (i > 0 || MethodData::profile_return()) {

           // If return value type is profiled we may have no argument to profile.

           ld(tmp1, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args, R28_mdx);

           cmpdi(CCR0, tmp1, (i+1)*TypeStackSlotEntries::per_arg_count());

           addi(tmp1, tmp1, -i*TypeStackSlotEntries::per_arg_count());

           blt(CCR0, done);

         }

         ld(tmp1, in_bytes(Method::const_offset()), callee);

         lhz(tmp1, in_bytes(ConstMethod::size_of_parameters_offset()), tmp1);

         // Stack offset o (zero based) from the start of the argument

         // list, for n arguments translates into offset n - o - 1 from

         // the end of the argument list. But there's an extra slot at

         // the top of the stack. So the offset is n - o from Lesp.

         ld(tmp2, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))-off_to_args, R28_mdx);

         subf(tmp1, tmp2, tmp1);

         sldi(tmp1, tmp1, Interpreter::logStackElementSize);

         ldx(tmp1, tmp1, R15_esp);

         profile_obj_type(tmp1, R28_mdx, in_bytes(TypeEntriesAtCall::argument_type_offset(i))-off_to_args, tmp2, tmp1);

         int to_add = in_bytes(TypeStackSlotEntries::per_arg_size());

         addi(R28_mdx, R28_mdx, to_add);

         off_to_args += to_add;

       }

       if (MethodData::profile_return()) {

         ld(tmp1, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args, R28_mdx);

         addi(tmp1, tmp1, -TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count());

       }

       bind(done);

       if (MethodData::profile_return()) {

         // We're right after the type profile for the last

         // argument. tmp1 is the number of cells left in the

         // CallTypeData/VirtualCallTypeData to reach its end. Non null

         // if there's a return to profile.

         assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type");

         sldi(tmp1, tmp1, exact_log2(DataLayout::cell_size));

         add(R28_mdx, tmp1, R28_mdx);

       }

     } else {

       assert(MethodData::profile_return(), "either profile call args or call ret");

       update_mdp_by_constant(in_bytes(TypeEntriesAtCall::return_only_size()));

     }

     // Mdp points right after the end of the

     // CallTypeData/VirtualCallTypeData, right after the cells for the

     // return value type if there's one.

     align(32, 12);

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_return_type(Register ret, Register tmp1, Register tmp2) {

   assert_different_registers(ret, tmp1, tmp2);

   if (ProfileInterpreter && MethodData::profile_return()) {

     Label profile_continue;

     test_method_data_pointer(profile_continue);

     if (MethodData::profile_return_jsr292_only()) {

       // If we don't profile all invoke bytecodes we must make sure

       // it's a bytecode we indeed profile. We can't go back to the

       // begining of the ProfileData we intend to update to check its

       // type because we're right after it and we don't known its

       // length.

       lbz(tmp1, 0, R14_bcp);

       lbz(tmp2, Method::intrinsic_id_offset_in_bytes(), R19_method);

       cmpwi(CCR0, tmp1, Bytecodes::_invokedynamic);

       cmpwi(CCR1, tmp1, Bytecodes::_invokehandle);

       cror(/*CR0 eq*/2, /*CR1 eq*/4+2, /*CR0 eq*/2);

       cmpwi(CCR1, tmp2, vmIntrinsics::_compiledLambdaForm);

       cror(/*CR0 eq*/2, /*CR1 eq*/4+2, /*CR0 eq*/2);

       bne(CCR0, profile_continue);

     }

     profile_obj_type(ret, R28_mdx, -in_bytes(ReturnTypeEntry::size()), tmp1, tmp2);

     align(32, 12);

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_parameters_type(Register tmp1, Register tmp2, Register tmp3, Register tmp4) {

   if (ProfileInterpreter && MethodData::profile_parameters()) {

     Label profile_continue, done;

     test_method_data_pointer(profile_continue);

     // Load the offset of the area within the MDO used for

     // parameters. If it's negative we're not profiling any parameters.

     lwz(tmp1, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset()), R28_mdx);

     cmpwi(CCR0, tmp1, 0);

     blt(CCR0, profile_continue);

     // Compute a pointer to the area for parameters from the offset

     // and move the pointer to the slot for the last

     // parameters. Collect profiling from last parameter down.

     // mdo start + parameters offset + array length - 1

     // Pointer to the parameter area in the MDO.

     const Register mdp = tmp1;

     add(mdp, tmp1, R28_mdx);

     // Pffset of the current profile entry to update.

     const Register entry_offset = tmp2;

     // entry_offset = array len in number of cells

     ld(entry_offset, in_bytes(ArrayData::array_len_offset()), mdp);

     int off_base = in_bytes(ParametersTypeData::stack_slot_offset(0));

     assert(off_base % DataLayout::cell_size == 0, "should be a number of cells");

     // entry_offset (number of cells)  = array len - size of 1 entry + offset of the stack slot field

     addi(entry_offset, entry_offset, -TypeStackSlotEntries::per_arg_count() + (off_base / DataLayout::cell_size));

     // entry_offset in bytes

     sldi(entry_offset, entry_offset, exact_log2(DataLayout::cell_size));

     Label loop;

     align(32, 12);

     bind(loop);

     // Load offset on the stack from the slot for this parameter.

     ld(tmp3, entry_offset, mdp);

     sldi(tmp3, tmp3, Interpreter::logStackElementSize);

     neg(tmp3, tmp3);

     // Read the parameter from the local area.

     ldx(tmp3, tmp3, R18_locals);

     // Make entry_offset now point to the type field for this parameter.

     int type_base = in_bytes(ParametersTypeData::type_offset(0));

     assert(type_base > off_base, "unexpected");

     addi(entry_offset, entry_offset, type_base - off_base);

     // Profile the parameter.

     profile_obj_type(tmp3, mdp, entry_offset, tmp4, tmp3);

     // Go to next parameter.

     int delta = TypeStackSlotEntries::per_arg_count() * DataLayout::cell_size + (type_base - off_base);

     cmpdi(CCR0, entry_offset, off_base + delta);

     addi(entry_offset, entry_offset, -delta);

     bge(CCR0, loop);

     align(32, 12);

     bind(profile_continue);

   }

 }

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

 void InterpreterMacroAssembler::add_monitor_to_stack(bool stack_is_empty, Register Rtemp1, Register Rtemp2) {

   // Very-local scratch registers.

   const Register esp  = Rtemp1;

   const Register slot = Rtemp2;

   // Extracted monitor_size.

   int monitor_size = frame::interpreter_frame_monitor_size_in_bytes();

   assert(Assembler::is_aligned((unsigned int)monitor_size,

                                (unsigned int)frame::alignment_in_bytes),

          "size of a monitor must respect alignment of SP");

   resize_frame(-monitor_size, /*temp*/esp); // Allocate space for new monitor

   std(R1_SP, _ijava_state_neg(top_frame_sp), esp); // esp contains fp

   // Shuffle expression stack down. Recall that stack_base points

   // just above the new expression stack bottom. Old_tos and new_tos

   // are used to scan thru the old and new expression stacks.

   if (!stack_is_empty) {

     Label copy_slot, copy_slot_finished;

     const Register n_slots = slot;

     addi(esp, R15_esp, Interpreter::stackElementSize); // Point to first element (pre-pushed stack).

     subf(n_slots, esp, R26_monitor);

     srdi_(n_slots, n_slots, LogBytesPerWord);          // Compute number of slots to copy.

     assert(LogBytesPerWord == 3, "conflicts assembler instructions");

     beq(CCR0, copy_slot_finished);                     // Nothing to copy.

     mtctr(n_slots);

     // loop

     bind(copy_slot);

     ld(slot, 0, esp);              // Move expression stack down.

     std(slot, -monitor_size, esp); // distance = monitor_size

     addi(esp, esp, BytesPerWord);

     bdnz(copy_slot);

     bind(copy_slot_finished);

   }

   addi(R15_esp, R15_esp, -monitor_size);

   addi(R26_monitor, R26_monitor, -monitor_size);

   // Restart interpreter

 }

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

 // Java locals access

 // Load a local variable at index in Rindex into register Rdst_value.

 // Also puts address of local into Rdst_address as a service.

 // Kills:

 //   - Rdst_value

 //   - Rdst_address

 void InterpreterMacroAssembler::load_local_int(Register Rdst_value, Register Rdst_address, Register Rindex) {

   sldi(Rdst_address, Rindex, Interpreter::logStackElementSize);

   subf(Rdst_address, Rdst_address, R18_locals);

   lwz(Rdst_value, 0, Rdst_address);

 }

 // Load a local variable at index in Rindex into register Rdst_value.

 // Also puts address of local into Rdst_address as a service.

 // Kills:

 //   - Rdst_value

 //   - Rdst_address

 void InterpreterMacroAssembler::load_local_long(Register Rdst_value, Register Rdst_address, Register Rindex) {

   sldi(Rdst_address, Rindex, Interpreter::logStackElementSize);

   subf(Rdst_address, Rdst_address, R18_locals);

   ld(Rdst_value, -8, Rdst_address);

 }

 // Load a local variable at index in Rindex into register Rdst_value.

 // Also puts address of local into Rdst_address as a service.

 // Input:

 //   - Rindex:      slot nr of local variable

 // Kills:

 //   - Rdst_value

 //   - Rdst_address

 void InterpreterMacroAssembler::load_local_ptr(Register Rdst_value, Register Rdst_address, Register Rindex) {

   sldi(Rdst_address, Rindex, Interpreter::logStackElementSize);

   subf(Rdst_address, Rdst_address, R18_locals);

   ld(Rdst_value, 0, Rdst_address);

 }

 // Load a local variable at index in Rindex into register Rdst_value.

 // Also puts address of local into Rdst_address as a service.

 // Kills:

 //   - Rdst_value

 //   - Rdst_address

 void InterpreterMacroAssembler::load_local_float(FloatRegister Rdst_value, Register Rdst_address, Register Rindex) {

   sldi(Rdst_address, Rindex, Interpreter::logStackElementSize);

   subf(Rdst_address, Rdst_address, R18_locals);

   lfs(Rdst_value, 0, Rdst_address);

 }

 // Load a local variable at index in Rindex into register Rdst_value.

 // Also puts address of local into Rdst_address as a service.

 // Kills:

 //   - Rdst_value

 //   - Rdst_address

 void InterpreterMacroAssembler::load_local_double(FloatRegister Rdst_value, Register Rdst_address, Register Rindex) {

   sldi(Rdst_address, Rindex, Interpreter::logStackElementSize);

   subf(Rdst_address, Rdst_address, R18_locals);

   lfd(Rdst_value, -8, Rdst_address);

 }

 // Store an int value at local variable slot Rindex.

 // Kills:

 //   - Rindex

 void InterpreterMacroAssembler::store_local_int(Register Rvalue, Register Rindex) {

   sldi(Rindex, Rindex, Interpreter::logStackElementSize);

   subf(Rindex, Rindex, R18_locals);

   stw(Rvalue, 0, Rindex);

 }

 // Store a long value at local variable slot Rindex.

 // Kills:

 //   - Rindex

 void InterpreterMacroAssembler::store_local_long(Register Rvalue, Register Rindex) {

   sldi(Rindex, Rindex, Interpreter::logStackElementSize);

   subf(Rindex, Rindex, R18_locals);

   std(Rvalue, -8, Rindex);

 }

 // Store an oop value at local variable slot Rindex.

 // Kills:

 //   - Rindex

 void InterpreterMacroAssembler::store_local_ptr(Register Rvalue, Register Rindex) {

   sldi(Rindex, Rindex, Interpreter::logStackElementSize);

   subf(Rindex, Rindex, R18_locals);

   std(Rvalue, 0, Rindex);

 }

 // Store an int value at local variable slot Rindex.

 // Kills:

 //   - Rindex

 void InterpreterMacroAssembler::store_local_float(FloatRegister Rvalue, Register Rindex) {

   sldi(Rindex, Rindex, Interpreter::logStackElementSize);

   subf(Rindex, Rindex, R18_locals);

   stfs(Rvalue, 0, Rindex);

 }

 // Store an int value at local variable slot Rindex.

 // Kills:

 //   - Rindex

 void InterpreterMacroAssembler::store_local_double(FloatRegister Rvalue, Register Rindex) {

   sldi(Rindex, Rindex, Interpreter::logStackElementSize);

   subf(Rindex, Rindex, R18_locals);

   stfd(Rvalue, -8, Rindex);

 }

 // Read pending exception from thread and jump to interpreter.

 // Throw exception entry if one if pending. Fall through otherwise.

 void InterpreterMacroAssembler::check_and_forward_exception(Register Rscratch1, Register Rscratch2) {

   assert_different_registers(Rscratch1, Rscratch2, R3);

   Register Rexception = Rscratch1;

   Register Rtmp       = Rscratch2;

   Label Ldone;

   // Get pending exception oop.

   ld(Rexception, thread_(pending_exception));

   cmpdi(CCR0, Rexception, 0);

   beq(CCR0, Ldone);

   li(Rtmp, 0);

   mr_if_needed(R3, Rexception);

   std(Rtmp, thread_(pending_exception)); // Clear exception in thread

   if (Interpreter::rethrow_exception_entry() != NULL) {

     // Already got entry address.

     load_dispatch_table(Rtmp, (address*)Interpreter::rethrow_exception_entry());

   } else {

     // Dynamically load entry address.

     int simm16_rest = load_const_optimized(Rtmp, &Interpreter::_rethrow_exception_entry, R0, true);

     ld(Rtmp, simm16_rest, Rtmp);

   }

   mtctr(Rtmp);

   save_interpreter_state(Rtmp);

   bctr();

   align(32, 12);

   bind(Ldone);

 }

 void InterpreterMacroAssembler::call_VM(Register oop_result, address entry_point, bool check_exceptions) {

   save_interpreter_state(R11_scratch1);

   MacroAssembler::call_VM(oop_result, entry_point, false);

   restore_interpreter_state(R11_scratch1, /*bcp_and_mdx_only*/ true);

   check_and_handle_popframe(R11_scratch1);

   check_and_handle_earlyret(R11_scratch1);

   // Now check exceptions manually.

   if (check_exceptions) {

     check_and_forward_exception(R11_scratch1, R12_scratch2);

   }

 }

 void InterpreterMacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions) {

   // ARG1 is reserved for the thread.

   mr_if_needed(R4_ARG2, arg_1);

   call_VM(oop_result, entry_point, check_exceptions);

 }

 void InterpreterMacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {

   // ARG1 is reserved for the thread.

   mr_if_needed(R4_ARG2, arg_1);

   assert(arg_2 != R4_ARG2, "smashed argument");

   mr_if_needed(R5_ARG3, arg_2);

   call_VM(oop_result, entry_point, check_exceptions);

 }

 void InterpreterMacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions) {

   // ARG1 is reserved for the thread.

   mr_if_needed(R4_ARG2, arg_1);

   assert(arg_2 != R4_ARG2, "smashed argument");

   mr_if_needed(R5_ARG3, arg_2);

   assert(arg_3 != R4_ARG2 && arg_3 != R5_ARG3, "smashed argument");

   mr_if_needed(R6_ARG4, arg_3);

   call_VM(oop_result, entry_point, check_exceptions);

 }

 void InterpreterMacroAssembler::save_interpreter_state(Register scratch) {

   ld(scratch, 0, R1_SP);

   std(R15_esp, _ijava_state_neg(esp), scratch);

   std(R14_bcp, _ijava_state_neg(bcp), scratch);

   std(R26_monitor, _ijava_state_neg(monitors), scratch);

   if (ProfileInterpreter) { std(R28_mdx, _ijava_state_neg(mdx), scratch); }

   // Other entries should be unchanged.

 }

 void InterpreterMacroAssembler::restore_interpreter_state(Register scratch, bool bcp_and_mdx_only) {

   ld(scratch, 0, R1_SP);

   ld(R14_bcp, _ijava_state_neg(bcp), scratch); // Changed by VM code (exception).

   if (ProfileInterpreter) { ld(R28_mdx, _ijava_state_neg(mdx), scratch); } // Changed by VM code.

   if (!bcp_and_mdx_only) {

     // Following ones are Metadata.

     ld(R19_method, _ijava_state_neg(method), scratch);

     ld(R27_constPoolCache, _ijava_state_neg(cpoolCache), scratch);

     // Following ones are stack addresses and don't require reload.

     ld(R15_esp, _ijava_state_neg(esp), scratch);

     ld(R18_locals, _ijava_state_neg(locals), scratch);

     ld(R26_monitor, _ijava_state_neg(monitors), scratch);

   }

 #ifdef ASSERT

   {

     Label Lok;

     subf(R0, R1_SP, scratch);

     cmpdi(CCR0, R0, frame::abi_reg_args_size + frame::ijava_state_size);

     bge(CCR0, Lok);

     stop("frame too small (restore istate)", 0x5432);

     bind(Lok);

   }

   {

     Label Lok;

     ld(R0, _ijava_state_neg(ijava_reserved), scratch);

     cmpdi(CCR0, R0, 0x5afe);

     beq(CCR0, Lok);

     stop("frame corrupted (restore istate)", 0x5afe);

     bind(Lok);

   }

 #endif

 }

 #endif // !CC_INTERP

 void InterpreterMacroAssembler::get_method_counters(Register method,

                                                     Register Rcounters,

                                                     Label& skip) {

   BLOCK_COMMENT("Load and ev. allocate counter object {");

   Label has_counters;

   ld(Rcounters, in_bytes(Method::method_counters_offset()), method);

   cmpdi(CCR0, Rcounters, 0);

   bne(CCR0, has_counters);

   call_VM(noreg, CAST_FROM_FN_PTR(address,

                                   InterpreterRuntime::build_method_counters), method, false);

   ld(Rcounters, in_bytes(Method::method_counters_offset()), method);

   cmpdi(CCR0, Rcounters, 0);

   beq(CCR0, skip); // No MethodCounters, OutOfMemory.

   BLOCK_COMMENT("} Load and ev. allocate counter object");

   bind(has_counters);

 }

 void InterpreterMacroAssembler::increment_invocation_counter(Register Rcounters, Register iv_be_count, Register Rtmp_r0) {

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

   Register invocation_count = iv_be_count;

   Register backedge_count   = Rtmp_r0;

   int delta = InvocationCounter::count_increment;

   // Load each counter in a register.

   //  ld(inv_counter, Rtmp);

   //  ld(be_counter, Rtmp2);

   int inv_counter_offset = in_bytes(MethodCounters::invocation_counter_offset() +

                                     InvocationCounter::counter_offset());

   int be_counter_offset  = in_bytes(MethodCounters::backedge_counter_offset() +

                                     InvocationCounter::counter_offset());

   BLOCK_COMMENT("Increment profiling counters {");

   // Load the backedge counter.

   lwz(backedge_count, be_counter_offset, Rcounters); // is unsigned int

   // Mask the backedge counter.

   Register tmp = invocation_count;

   li(tmp, InvocationCounter::count_mask_value);

   andr(backedge_count, tmp, backedge_count); // Cannot use andi, need sign extension of count_mask_value.

   // Load the invocation counter.

   lwz(invocation_count, inv_counter_offset, Rcounters); // is unsigned int

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

   addi(invocation_count, invocation_count, delta);

   // Store value.

   stw(invocation_count, inv_counter_offset, Rcounters);

   // Add invocation counter + backedge counter.

   add(iv_be_count, backedge_count, invocation_count);

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

   // register iv_be_count!

   BLOCK_COMMENT("} Increment profiling counters");

 }

 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) {

   if (state == atos) { MacroAssembler::verify_oop(reg); }

 }

 #ifndef CC_INTERP

 // 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_FPU(int stack_depth, TosState state) {

   if (VerifyFPU) {

     unimplemented("verfiyFPU");

   }

 }

 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):

   const int log2_bytecode_size_limit = 16;

   srdi_(Rtmp, reg, log2_bytecode_size_limit);

   bne(CCR0, test);

   address fd = CAST_FROM_FN_PTR(address, verify_return_address);

   const int nbytes_save = 11*8; // volatile gprs except R0

   save_volatile_gprs(R1_SP, -nbytes_save); // except R0

   save_LR_CR(Rtmp); // Save in old frame.

   push_frame_reg_args(nbytes_save, Rtmp);

   load_const_optimized(Rtmp, fd, R0);

   mr_if_needed(R4_ARG2, reg);

   mr(R3_ARG1, R19_method);

   call_c(Rtmp); // call C

   pop_frame();

   restore_LR_CR(Rtmp);

   restore_volatile_gprs(R1_SP, -nbytes_save); // except R0

   b(skip);

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

   // Not an address; verify it:

   bind(test);

   verify_oop(reg);

   bind(skip);

 }

 #endif // !CC_INTERP

 // Inline assembly for:

 //

 // if (thread is in interp_only_mode) {

 //   InterpreterRuntime::post_method_entry();

 // }

 // if (*jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_ENTRY ) ||

 //     *jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_ENTRY2)   ) {

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

 // }

 void InterpreterMacroAssembler::notify_method_entry() {

   // JVMTI

   // 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 jvmti_post_done;

     lwz(R0, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);

     cmpwi(CCR0, R0, 0);

     beq(CCR0, jvmti_post_done);

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

             /*check_exceptions=*/true CC_INTERP_ONLY(&& false));

     bind(jvmti_post_done);

   }

 }

 // Inline assembly for:

 //

 // if (thread is in interp_only_mode) {

 //   // save result

 //   InterpreterRuntime::post_method_exit();

 //   // restore result

 // }

 // if (*jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_EXIT)) {

 //   // save result

 //   SharedRuntime::jvmpi_method_exit();

 //   // restore result

 // }

 //

 // 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, bool check_exceptions) {

   // JVMTI

   // 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 jvmti_post_done;

     lwz(R0, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);

     cmpwi(CCR0, R0, 0);

     beq(CCR0, jvmti_post_done);

     CC_INTERP_ONLY(assert(is_native_method && !check_exceptions, "must not push state"));

     if (!is_native_method) push(state); // Expose tos to GC.

     call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit),

             /*check_exceptions=*/check_exceptions);

     if (!is_native_method) pop(state);

     align(32, 12);

     bind(jvmti_post_done);

   }

   // Dtrace support not implemented.

 }

 #ifdef CC_INTERP

 // Convert the current TOP_IJAVA_FRAME into a PARENT_IJAVA_FRAME

 // (using parent_frame_resize) and push a new interpreter

 // TOP_IJAVA_FRAME (using frame_size).

 void InterpreterMacroAssembler::push_interpreter_frame(Register top_frame_size, Register parent_frame_resize,

                                                        Register tmp1, Register tmp2, Register tmp3,

                                                        Register tmp4, Register pc) {

   assert_different_registers(top_frame_size, parent_frame_resize, tmp1, tmp2, tmp3, tmp4);

   ld(tmp1, _top_ijava_frame_abi(frame_manager_lr), R1_SP);

   mr(tmp2/*top_frame_sp*/, R1_SP);

   // Move initial_caller_sp.

   ld(tmp4, _top_ijava_frame_abi(initial_caller_sp), R1_SP);

   neg(parent_frame_resize, parent_frame_resize);

   resize_frame(parent_frame_resize/*-parent_frame_resize*/, tmp3);

   // Set LR in new parent frame.

   std(tmp1, _abi(lr), R1_SP);

   // Set top_frame_sp info for new parent frame.

   std(tmp2, _parent_ijava_frame_abi(top_frame_sp), R1_SP);

   std(tmp4, _parent_ijava_frame_abi(initial_caller_sp), R1_SP);

   // Push new TOP_IJAVA_FRAME.

   push_frame(top_frame_size, tmp2);

   get_PC_trash_LR(tmp3);

   std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP);

   // Used for non-initial callers by unextended_sp().

   std(R1_SP, _top_ijava_frame_abi(initial_caller_sp), R1_SP);

 }

 // Pop the topmost TOP_IJAVA_FRAME and convert the previous

 // PARENT_IJAVA_FRAME back into a TOP_IJAVA_FRAME.

 void InterpreterMacroAssembler::pop_interpreter_frame(Register tmp1, Register tmp2, Register tmp3, Register tmp4) {

   assert_different_registers(tmp1, tmp2, tmp3, tmp4);

   ld(tmp1/*caller's sp*/, _abi(callers_sp), R1_SP);

   ld(tmp3, _abi(lr), tmp1);

   ld(tmp4, _parent_ijava_frame_abi(initial_caller_sp), tmp1);

   ld(tmp2/*caller's caller's sp*/, _abi(callers_sp), tmp1);

   // Merge top frame.

   std(tmp2, _abi(callers_sp), R1_SP);

   ld(tmp2, _parent_ijava_frame_abi(top_frame_sp), tmp1);

   // Update C stack pointer to caller's top_abi.

   resize_frame_absolute(tmp2/*addr*/, tmp1/*tmp*/, tmp2/*tmp*/);

   // Update LR in top_frame.

   std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP);

   std(tmp4, _top_ijava_frame_abi(initial_caller_sp), R1_SP);

   // Store the top-frame stack-pointer for c2i adapters.

   std(R1_SP, _top_ijava_frame_abi(top_frame_sp), R1_SP);

 }

 // Turn state's interpreter frame into the current TOP_IJAVA_FRAME.

 void InterpreterMacroAssembler::pop_interpreter_frame_to_state(Register state, Register tmp1, Register tmp2, Register tmp3) {

   assert_different_registers(R14_state, R15_prev_state, tmp1, tmp2, tmp3);

   if (state == R14_state) {

     ld(tmp1/*state's fp*/, state_(_last_Java_fp));

     ld(tmp2/*state's sp*/, state_(_last_Java_sp));

   } else if (state == R15_prev_state) {

     ld(tmp1/*state's fp*/, prev_state_(_last_Java_fp));

     ld(tmp2/*state's sp*/, prev_state_(_last_Java_sp));

   } else {

     ShouldNotReachHere();

   }

   // Merge top frames.

   std(tmp1, _abi(callers_sp), R1_SP);

   // Tmp2 is new SP.

   // Tmp1 is parent's SP.

   resize_frame_absolute(tmp2/*addr*/, tmp1/*tmp*/, tmp2/*tmp*/);

   // Update LR in top_frame.

   // Must be interpreter frame.

   get_PC_trash_LR(tmp3);

   std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP);

   // Used for non-initial callers by unextended_sp().

   std(R1_SP, _top_ijava_frame_abi(initial_caller_sp), R1_SP);

 }

 // Set SP to initial caller's sp, but before fix the back chain.

 void InterpreterMacroAssembler::resize_frame_to_initial_caller(Register tmp1, Register tmp2) {

   ld(tmp1, _parent_ijava_frame_abi(initial_caller_sp), R1_SP);

   ld(tmp2, _parent_ijava_frame_abi(callers_sp), R1_SP);

   std(tmp2, _parent_ijava_frame_abi(callers_sp), tmp1); // Fix back chain ...

   mr(R1_SP, tmp1); // ... and resize to initial caller.

 }

 // Pop the current interpreter state (without popping the correspoding

 // frame) and restore R14_state and R15_prev_state accordingly.

 // Use prev_state_may_be_0 to indicate whether prev_state may be 0

 // in order to generate an extra check before retrieving prev_state_(_prev_link).

 void InterpreterMacroAssembler::pop_interpreter_state(bool prev_state_may_be_0)

 {

   // Move prev_state to state and restore prev_state from state_(_prev_link).

   Label prev_state_is_0;

   mr(R14_state, R15_prev_state);

   // Don't retrieve /*state==*/prev_state_(_prev_link)

   // if /*state==*/prev_state is 0.

   if (prev_state_may_be_0) {

     cmpdi(CCR0, R15_prev_state, 0);

     beq(CCR0, prev_state_is_0);

   }

   ld(R15_prev_state, /*state==*/prev_state_(_prev_link));

   bind(prev_state_is_0);

 }

 void InterpreterMacroAssembler::restore_prev_state() {

   // _prev_link is private, but cInterpreter is a friend.

   ld(R15_prev_state, state_(_prev_link));

 }

 #endif // CC_INTERP