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 /*

  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.

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

  *

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

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

  * published by the Free Software Foundation.

  *

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

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

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

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

  * accompanied this code).

  *

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

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

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

  *

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

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

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "interp_masm_x86.hpp"

 #include "interpreter/interpreter.hpp"

 #include "oops/methodData.hpp"

 // 8u does not have InterpreterMacroAssembler::load_earlyret_value here

 void InterpreterMacroAssembler::narrow(Register result) {

   // Get method->_constMethod->_result_type

   movptr(rcx, Address(rbp, frame::interpreter_frame_method_offset * wordSize));

   movptr(rcx, Address(rcx, Method::const_offset()));

   load_unsigned_byte(rcx, Address(rcx, ConstMethod::result_type_offset()));

   Label done, notBool, notByte, notChar;

   // common case first

   cmpl(rcx, T_INT);

   jcc(Assembler::equal, done);

   // mask integer result to narrower return type.

   cmpl(rcx, T_BOOLEAN);

   jcc(Assembler::notEqual, notBool);

   andl(result, 0x1);

   jmp(done);

   bind(notBool);

   cmpl(rcx, T_BYTE);

   jcc(Assembler::notEqual, notByte);

   LP64_ONLY(movsbl(result, result);)

   NOT_LP64(shll(result, 24);)      // truncate upper 24 bits

   NOT_LP64(sarl(result, 24);)      // and sign-extend byte

   jmp(done);

   bind(notByte);

   cmpl(rcx, T_CHAR);

   jcc(Assembler::notEqual, notChar);

   LP64_ONLY(movzwl(result, result);)

   NOT_LP64(andl(result, 0xFFFF);)  // truncate upper 16 bits

   jmp(done);

   bind(notChar);

   // cmpl(rcx, T_SHORT);  // all that's left

   // jcc(Assembler::notEqual, done);

   LP64_ONLY(movswl(result, result);)

   NOT_LP64(shll(result, 16);)      // truncate upper 16 bits

   NOT_LP64(sarl(result, 16);)      // and sign-extend short

   // Nothing to do for T_INT

   bind(done);

 }

 #ifndef CC_INTERP

 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) {

   Label update, next, none;

   verify_oop(obj);

   testptr(obj, obj);

   jccb(Assembler::notZero, update);

   orptr(mdo_addr, TypeEntries::null_seen);

   jmpb(next);

   bind(update);

   load_klass(obj, obj);

   xorptr(obj, mdo_addr);

   testptr(obj, TypeEntries::type_klass_mask);

   jccb(Assembler::zero, next); // klass seen before, nothing to

                                // do. The unknown bit may have been

                                // set already but no need to check.

   testptr(obj, TypeEntries::type_unknown);

   jccb(Assembler::notZero, next); // already unknown. Nothing to do anymore.

   cmpptr(mdo_addr, 0);

   jccb(Assembler::equal, none);

   cmpptr(mdo_addr, TypeEntries::null_seen);

   jccb(Assembler::equal, none);

   // There is a chance that the checks above (re-reading profiling

   // data from memory) fail if another thread has just set the

   // profiling to this obj's klass

   xorptr(obj, mdo_addr);

   testptr(obj, TypeEntries::type_klass_mask);

   jccb(Assembler::zero, next);

   // different than before. Cannot keep accurate profile.

   orptr(mdo_addr, TypeEntries::type_unknown);

   jmpb(next);

   bind(none);

   // first time here. Set profile type.

   movptr(mdo_addr, obj);

   bind(next);

 }

 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) {

   if (!ProfileInterpreter) {

     return;

   }

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

     Label profile_continue;

     test_method_data_pointer(mdp, profile_continue);

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

     cmpb(Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start), is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag);

     jcc(Assembler::notEqual, profile_continue);

     if (MethodData::profile_arguments()) {

       Label done;

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

       addptr(mdp, off_to_args);

       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

           movptr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args));

           subl(tmp, i*TypeStackSlotEntries::per_arg_count());

           cmpl(tmp, TypeStackSlotEntries::per_arg_count());

           jcc(Assembler::less, done);

         }

         movptr(tmp, Address(callee, Method::const_offset()));

         load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset()));

         // 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

         subptr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))-off_to_args));

         subl(tmp, 1);

         Address arg_addr = argument_address(tmp);

         movptr(tmp, arg_addr);

         Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i))-off_to_args);

         profile_obj_type(tmp, mdo_arg_addr);

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

         addptr(mdp, to_add);

         off_to_args += to_add;

       }

       if (MethodData::profile_return()) {

         movptr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args));

         subl(tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count());

       }

       bind(done);

       if (MethodData::profile_return()) {

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

         // argument. tmp 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");

         shll(tmp, exact_log2(DataLayout::cell_size));

         addptr(mdp, tmp);

       }

       movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp);

     } else {

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

       update_mdp_by_constant(mdp, 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

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) {

   assert_different_registers(mdp, ret, tmp, _bcp_register);

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

     Label profile_continue, done;

     test_method_data_pointer(mdp, 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

       Label do_profile;

       cmpb(Address(_bcp_register, 0), Bytecodes::_invokedynamic);

       jcc(Assembler::equal, do_profile);

       cmpb(Address(_bcp_register, 0), Bytecodes::_invokehandle);

       jcc(Assembler::equal, do_profile);

       get_method(tmp);

       cmpb(Address(tmp, Method::intrinsic_id_offset_in_bytes()), vmIntrinsics::_compiledLambdaForm);

       jcc(Assembler::notEqual, profile_continue);

       bind(do_profile);

     }

     Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size()));

     mov(tmp, ret);

     profile_obj_type(tmp, mdo_ret_addr);

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) {

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

     Label profile_continue, done;

     test_method_data_pointer(mdp, profile_continue);

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

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

     movl(tmp1, Address(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset())));

     testl(tmp1, tmp1);

     jcc(Assembler::negative, 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

     addptr(mdp, tmp1);

     movptr(tmp1, Address(mdp, ArrayData::array_len_offset()));

     decrement(tmp1, TypeStackSlotEntries::per_arg_count());

     Label loop;

     bind(loop);

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

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

     Address::ScaleFactor per_arg_scale = Address::times(DataLayout::cell_size);

     Address arg_off(mdp, tmp1, per_arg_scale, off_base);

     Address arg_type(mdp, tmp1, per_arg_scale, type_base);

     // load offset on the stack from the slot for this parameter

     movptr(tmp2, arg_off);

     negptr(tmp2);

     // read the parameter from the local area

     movptr(tmp2, Address(_locals_register, tmp2, Interpreter::stackElementScale()));

     // profile the parameter

     profile_obj_type(tmp2, arg_type);

     // go to next parameter

     decrement(tmp1, TypeStackSlotEntries::per_arg_count());

     jcc(Assembler::positive, loop);

     bind(profile_continue);

   }

 }

 #endif