/*

 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2016 SAP SE. 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 "interpreter/interp_masm.hpp"

#include "interpreter/interpreter.hpp"

#include "interpreter/interpreterRuntime.hpp"

#include "memory/allocation.inline.hpp"

#include "memory/universe.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/icache.hpp"

#include "runtime/interfaceSupport.inline.hpp"

#include "runtime/signature.hpp"

// Access macros for Java and C arguments.

// First Java argument is at index-1.

#define locals_j_arg_at(index) Address(Z_R1/*locals*/, in_ByteSize((-(index)*wordSize)))

#define __ _masm->

static int sp_c_int_arg_offset(int arg_nr, int fp_arg_nr) {

  int int_arg_nr = arg_nr-fp_arg_nr;

  // arg_nr, fp_arg_nr start with 1 => int_arg_nr starts with 0

  if (int_arg_nr < 5) {

    return int_arg_nr * wordSize + _z_abi(carg_1);

  }

  int offset = int_arg_nr - 5 + (fp_arg_nr > 4 ? fp_arg_nr - 4 : 0);

  return offset * wordSize + _z_abi(remaining_cargs);

}

static int sp_c_fp_arg_offset(int arg_nr, int fp_arg_nr) {

  int int_arg_nr = arg_nr-fp_arg_nr;

  // Arg_nr, fp_arg_nr start with 1 => int_arg_nr starts with 0.

  if (fp_arg_nr < 5) {

    return (fp_arg_nr - 1 ) * wordSize + _z_abi(cfarg_1);

  }

  int offset = fp_arg_nr - 5 + (int_arg_nr > 4 ? int_arg_nr - 4 : 0);

  return offset * wordSize + _z_abi(remaining_cargs);

}

// Implementation of SignatureHandlerGenerator

InterpreterRuntime::SignatureHandlerGenerator::SignatureHandlerGenerator(

    const methodHandle& method, CodeBuffer* buffer) : NativeSignatureIterator(method) {

  _masm = new MacroAssembler(buffer);

  _fp_arg_nr = 0;

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {

  int int_arg_nr = jni_offset() - _fp_arg_nr;

  Register r = (int_arg_nr < 5 /*max_int_register_arguments*/) ?

                 as_Register(int_arg_nr) + Z_ARG1->encoding() : Z_R0;

  __ z_lgf(r, locals_j_arg_at(offset()));

  if (DEBUG_ONLY(true ||) int_arg_nr >= 5) {

    __ z_stg(r, sp_c_int_arg_offset(jni_offset(), _fp_arg_nr), Z_SP);

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {

  int int_arg_nr = jni_offset() - _fp_arg_nr;

  Register r = (int_arg_nr < 5 /*max_int_register_arguments*/) ?

                 as_Register(int_arg_nr) + Z_ARG1->encoding() : Z_R0;

  __ z_lg(r, locals_j_arg_at(offset() + 1)); // Long resides in upper slot.

  if (DEBUG_ONLY(true ||) int_arg_nr >= 5) {

    __ z_stg(r, sp_c_int_arg_offset(jni_offset(), _fp_arg_nr), Z_SP);

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {

  FloatRegister fp_reg = (_fp_arg_nr < 4/*max_fp_register_arguments*/) ?

                           as_FloatRegister((_fp_arg_nr * 2) + Z_FARG1->encoding()) : Z_F1;

  _fp_arg_nr++;

  __ z_ley(fp_reg, locals_j_arg_at(offset()));

  if (DEBUG_ONLY(true ||) _fp_arg_nr > 4) {

    __ z_ste(fp_reg, sp_c_fp_arg_offset(jni_offset(), _fp_arg_nr) + 4, Z_SP);

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {

  FloatRegister fp_reg = (_fp_arg_nr < 4/*max_fp_register_arguments*/) ?

                           as_FloatRegister((_fp_arg_nr*2) + Z_FARG1->encoding()) : Z_F1;

  _fp_arg_nr++;

  __ z_ldy(fp_reg, locals_j_arg_at(offset()+1));

  if (DEBUG_ONLY(true ||) _fp_arg_nr > 4) {

    __ z_std(fp_reg, sp_c_fp_arg_offset(jni_offset(), _fp_arg_nr), Z_SP);

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {

  int int_arg_nr = jni_offset() - _fp_arg_nr;

  Register  r = (int_arg_nr < 5 /*max_int_register_arguments*/) ?

                  as_Register(int_arg_nr) + Z_ARG1->encoding() : Z_R0;

  // The handle for a receiver will never be null.

  bool do_NULL_check = offset() != 0 || is_static();

  Label do_null;

  if (do_NULL_check) {

    __ clear_reg(r, true, false);

    __ load_and_test_long(Z_R0, locals_j_arg_at(offset()));

    __ z_bre(do_null);

  }

  __ add2reg(r, -offset() * wordSize, Z_R1 /* locals */);

  __ bind(do_null);

  if (DEBUG_ONLY(true ||) int_arg_nr >= 5) {

    __ z_stg(r, sp_c_int_arg_offset(jni_offset(), _fp_arg_nr), Z_SP);

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::generate(uint64_t fingerprint) {

  __ z_lgr(Z_R1, Z_ARG1); // Z_R1 is used in locals_j_arg_at(index) macro.

  // Generate code to handle arguments.

  iterate(fingerprint);

  __ load_const_optimized(Z_RET, AbstractInterpreter::result_handler(method()->result_type()));

  __ z_br(Z_R14);

  __ flush();

}

#undef  __

// Implementation of SignatureHandlerLibrary

void SignatureHandlerLibrary::pd_set_handler(address handler) {}

IRT_ENTRY(address, InterpreterRuntime::get_signature(JavaThread* thread, Method* method))

  methodHandle m(thread, method);

  assert(m->is_native(), "sanity check");

  Symbol *s = m->signature();

  return (address) s->base();

IRT_END

IRT_ENTRY(address, InterpreterRuntime::get_result_handler(JavaThread* thread, Method* method))

  methodHandle m(thread, method);

  assert(m->is_native(), "sanity check");

  return AbstractInterpreter::result_handler(m->result_type());

IRT_END