/*

 * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2014, Red Hat Inc. 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 "oops/method.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/icache.hpp"

#include "runtime/interfaceSupport.inline.hpp"

#include "runtime/signature.hpp"

#define __ _masm->

// Implementation of SignatureHandlerGenerator

Register InterpreterRuntime::SignatureHandlerGenerator::from() { return rlocals; }

Register InterpreterRuntime::SignatureHandlerGenerator::to()   { return sp; }

Register InterpreterRuntime::SignatureHandlerGenerator::temp() { return rscratch1; }

InterpreterRuntime::SignatureHandlerGenerator::SignatureHandlerGenerator(

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

  _masm = new MacroAssembler(buffer);

  _num_int_args = (method->is_static() ? 1 : 0);

  _num_fp_args = 0;

  _stack_offset = 0;

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {

  const Address src(from(), Interpreter::local_offset_in_bytes(offset()));

  switch (_num_int_args) {

  case 0:

    __ ldr(c_rarg1, src);

    _num_int_args++;

    break;

  case 1:

    __ ldr(c_rarg2, src);

    _num_int_args++;

    break;

  case 2:

    __ ldr(c_rarg3, src);

    _num_int_args++;

    break;

  case 3:

    __ ldr(c_rarg4, src);

    _num_int_args++;

    break;

  case 4:

    __ ldr(c_rarg5, src);

    _num_int_args++;

    break;

  case 5:

    __ ldr(c_rarg6, src);

    _num_int_args++;

    break;

  case 6:

    __ ldr(c_rarg7, src);

    _num_int_args++;

    break;

  default:

    __ ldr(r0, src);

    __ str(r0, Address(to(), _stack_offset));

    _stack_offset += wordSize;

    _num_int_args++;

    break;

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {

  const Address src(from(), Interpreter::local_offset_in_bytes(offset() + 1));

  switch (_num_int_args) {

  case 0:

    __ ldr(c_rarg1, src);

    _num_int_args++;

    break;

  case 1:

    __ ldr(c_rarg2, src);

    _num_int_args++;

    break;

  case 2:

    __ ldr(c_rarg3, src);

    _num_int_args++;

    break;

  case 3:

    __ ldr(c_rarg4, src);

    _num_int_args++;

    break;

  case 4:

    __ ldr(c_rarg5, src);

    _num_int_args++;

    break;

  case 5:

    __ ldr(c_rarg6, src);

    _num_int_args++;

    break;

  case 6:

    __ ldr(c_rarg7, src);

    _num_int_args++;

    break;

  default:

    __ ldr(r0, src);

    __ str(r0, Address(to(), _stack_offset));

    _stack_offset += wordSize;

    _num_int_args++;

    break;

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {

  const Address src(from(), Interpreter::local_offset_in_bytes(offset()));

  if (_num_fp_args < Argument::n_float_register_parameters_c) {

    __ ldrs(as_FloatRegister(_num_fp_args++), src);

  } else {

    __ ldrw(r0, src);

    __ strw(r0, Address(to(), _stack_offset));

    _stack_offset += wordSize;

    _num_fp_args++;

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {

  const Address src(from(), Interpreter::local_offset_in_bytes(offset() + 1));

  if (_num_fp_args < Argument::n_float_register_parameters_c) {

    __ ldrd(as_FloatRegister(_num_fp_args++), src);

  } else {

    __ ldr(r0, src);

    __ str(r0, Address(to(), _stack_offset));

    _stack_offset += wordSize;

    _num_fp_args++;

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {

  switch (_num_int_args) {

  case 0:

    assert(offset() == 0, "argument register 1 can only be (non-null) receiver");

    __ add(c_rarg1, from(), Interpreter::local_offset_in_bytes(offset()));

    _num_int_args++;

    break;

  case 1:

    {

      __ add(r0, from(), Interpreter::local_offset_in_bytes(offset()));

      __ mov(c_rarg2, 0);

      __ ldr(temp(), r0);

      Label L;

      __ cbz(temp(), L);

      __ mov(c_rarg2, r0);

      __ bind(L);

      _num_int_args++;

      break;

    }

  case 2:

    {

      __ add(r0, from(), Interpreter::local_offset_in_bytes(offset()));

      __ mov(c_rarg3, 0);

      __ ldr(temp(), r0);

      Label L;

      __ cbz(temp(), L);

      __ mov(c_rarg3, r0);

      __ bind(L);

      _num_int_args++;

      break;

    }

  case 3:

    {

      __ add(r0, from(), Interpreter::local_offset_in_bytes(offset()));

      __ mov(c_rarg4, 0);

      __ ldr(temp(), r0);

      Label L;

      __ cbz(temp(), L);

      __ mov(c_rarg4, r0);

      __ bind(L);

      _num_int_args++;

      break;

    }

  case 4:

    {

      __ add(r0, from(), Interpreter::local_offset_in_bytes(offset()));

      __ mov(c_rarg5, 0);

      __ ldr(temp(), r0);

      Label L;

      __ cbz(temp(), L);

      __ mov(c_rarg5, r0);

      __ bind(L);

      _num_int_args++;

      break;

    }

  case 5:

    {

      __ add(r0, from(), Interpreter::local_offset_in_bytes(offset()));

      __ mov(c_rarg6, 0);

      __ ldr(temp(), r0);

      Label L;

      __ cbz(temp(), L);

      __ mov(c_rarg6, r0);

      __ bind(L);

      _num_int_args++;

      break;

    }

  case 6:

    {

      __ add(r0, from(), Interpreter::local_offset_in_bytes(offset()));

      __ mov(c_rarg7, 0);

      __ ldr(temp(), r0);

      Label L;

      __ cbz(temp(), L);

      __ mov(c_rarg7, r0);

      __ bind(L);

      _num_int_args++;

      break;

    }

 default:

   {

      __ add(r0, from(), Interpreter::local_offset_in_bytes(offset()));

      __ ldr(temp(), r0);

      Label L;

      __ cbnz(temp(), L);

      __ mov(r0, zr);

      __ bind(L);

      __ str(r0, Address(to(), _stack_offset));

      _stack_offset += wordSize;

      _num_int_args++;

      break;

   }

  }

}

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

  // generate code to handle arguments

  iterate(fingerprint);

  // return result handler

  __ lea(r0, ExternalAddress(Interpreter::result_handler(method()->result_type())));

  __ ret(lr);

  __ flush();

}

// Implementation of SignatureHandlerLibrary

void SignatureHandlerLibrary::pd_set_handler(address handler) {}

class SlowSignatureHandler

  : public NativeSignatureIterator {

 private:

  address   _from;

  intptr_t* _to;

  intptr_t* _int_args;

  intptr_t* _fp_args;

  intptr_t* _fp_identifiers;

  unsigned int _num_int_args;

  unsigned int _num_fp_args;

  virtual void pass_int()

  {

    jint from_obj = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));

    _from -= Interpreter::stackElementSize;

    if (_num_int_args < Argument::n_int_register_parameters_c-1) {

      *_int_args++ = from_obj;

      _num_int_args++;

    } else {

      *_to++ = from_obj;

      _num_int_args++;

    }

  }

  virtual void pass_long()

  {

    intptr_t from_obj = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));

    _from -= 2*Interpreter::stackElementSize;

    if (_num_int_args < Argument::n_int_register_parameters_c-1) {

      *_int_args++ = from_obj;

      _num_int_args++;

    } else {

      *_to++ = from_obj;

      _num_int_args++;

    }

  }

  virtual void pass_object()

  {

    intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));

    _from -= Interpreter::stackElementSize;

    if (_num_int_args < Argument::n_int_register_parameters_c-1) {

      *_int_args++ = (*from_addr == 0) ? NULL : (intptr_t)from_addr;

      _num_int_args++;

    } else {

      *_to++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;

      _num_int_args++;

    }

  }

  virtual void pass_float()

  {

    jint from_obj = *(jint*)(_from+Interpreter::local_offset_in_bytes(0));

    _from -= Interpreter::stackElementSize;

    if (_num_fp_args < Argument::n_float_register_parameters_c) {

      *_fp_args++ = from_obj;

      _num_fp_args++;

    } else {

      *_to++ = from_obj;

      _num_fp_args++;

    }

  }

  virtual void pass_double()

  {

    intptr_t from_obj = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));

    _from -= 2*Interpreter::stackElementSize;

    if (_num_fp_args < Argument::n_float_register_parameters_c) {

      *_fp_args++ = from_obj;

      *_fp_identifiers |= (1 << _num_fp_args); // mark as double

      _num_fp_args++;

    } else {

      *_to++ = from_obj;

      _num_fp_args++;

    }

  }

 public:

  SlowSignatureHandler(const methodHandle& method, address from, intptr_t* to)

    : NativeSignatureIterator(method)

  {

    _from = from;

    _to   = to;

    _int_args = to - (method->is_static() ? 16 : 17);

    _fp_args =  to - 8;

    _fp_identifiers = to - 9;

    *(int*) _fp_identifiers = 0;

    _num_int_args = (method->is_static() ? 1 : 0);

    _num_fp_args = 0;

  }

};

JRT_ENTRY(address,

          InterpreterRuntime::slow_signature_handler(JavaThread* thread,

                                                     Method* method,

                                                     intptr_t* from,

                                                     intptr_t* to))

  methodHandle m(thread, (Method*)method);

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

  // handle arguments

  SlowSignatureHandler ssh(m, (address)from, to);

  ssh.iterate(UCONST64(-1));

  // return result handler

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

JRT_END