jdk8-mips64-public/hotspot: src/cpu/ppc/vm/interp_masm_ppc

src/cpu/ppc/vm/interp_masm_ppc_64.cpp@70aa912cebe5 (annotated)

src/cpu/ppc/vm/interp_masm_ppc_64.cpp

Wed, 15 Apr 2020 11:49:55 +0800

author: aoqi
date: Wed, 15 Apr 2020 11:49:55 +0800
changeset 9852: 70aa912cebe5
parent 8604: 04d83ba48607
permissions: -rw-r--r--

Merge

 /*
  * 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 ztos: // 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 ztos:
     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 ztos:
     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
 }
 void InterpreterMacroAssembler::narrow(Register result) {
   Register ret_type = R11_scratch1;
   ld(R11_scratch1, in_bytes(Method::const_offset()), R19_method);
   lbz(ret_type, in_bytes(ConstMethod::result_type_offset()), R11_scratch1);
   Label notBool, notByte, notChar, done;
   // common case first
   cmpwi(CCR0, ret_type, T_INT);
   beq(CCR0, done);
   cmpwi(CCR0, ret_type, T_BOOLEAN);
   bne(CCR0, notBool);
   andi(result, result, 0x1);
   b(done);
   bind(notBool);
   cmpwi(CCR0, ret_type, T_BYTE);
   bne(CCR0, notByte);
   extsb(result, result);
   b(done);
   bind(notByte);
   cmpwi(CCR0, ret_type, T_CHAR);
   bne(CCR0, notChar);
   andi(result, result, 0xffff);
   b(done);
   bind(notChar);
   // cmpwi(CCR0, ret_type, T_SHORT);  // all that's left
   // bne(CCR0, done);
   extsh(result, result);
   // Nothing to do for T_INT
   bind(done);
 }
 // 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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/ppc/vm/interp_masm_ppc_64.cpp@70aa912cebe5 (annotated)

src/cpu/ppc/vm/interp_masm_ppc_64.cpp