/*

 * Copyright (c) 1998, 2018, 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 "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/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

InterpreterRuntime::SignatureHandlerGenerator::SignatureHandlerGenerator(

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

  _masm = new MacroAssembler(buffer);

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_word(int size_of_arg, int offset_in_arg) {

  Argument  jni_arg(jni_offset() + offset_in_arg, false);

  Register     Rtmp = O0;

  __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);

  __ store_argument(Rtmp, jni_arg);

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {

  Argument  jni_arg(jni_offset(), false);

  Register  Rtmp = O0;

  __ ldx(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);

  __ store_long_argument(Rtmp, jni_arg);

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {

  Argument  jni_arg(jni_offset(), false);

  FloatRegister  Rtmp = F0;

  __ ldf(FloatRegisterImpl::S, Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);

  __ store_float_argument(Rtmp, jni_arg);

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {

  Argument  jni_arg(jni_offset(), false);

  FloatRegister  Rtmp = F0;

  __ ldf(FloatRegisterImpl::D, Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);

  __ store_double_argument(Rtmp, jni_arg);

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {

  Argument  jni_arg(jni_offset(), false);

  Argument java_arg(    offset(), true);

  Register    Rtmp1 = O0;

  Register    Rtmp2 =  jni_arg.is_register() ?  jni_arg.as_register() : O0;

  Register    Rtmp3 =  G3_scratch;

  // the handle for a receiver will never be null

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

  Address     h_arg = Address(Llocals, Interpreter::local_offset_in_bytes(offset()));

  __ ld_ptr(h_arg, Rtmp1);

  if (!do_NULL_check) {

    __ add(h_arg.base(), h_arg.disp(), Rtmp2);

  } else {

    if (Rtmp1 == Rtmp2)

          __ tst(Rtmp1);

    else  __ addcc(G0, Rtmp1, Rtmp2); // optimize mov/test pair

    Label L;

    __ brx(Assembler::notZero, true, Assembler::pt, L);

    __ delayed()->add(h_arg.base(), h_arg.disp(), Rtmp2);

    __ bind(L);

  }

  __ store_ptr_argument(Rtmp2, jni_arg);    // this is often a no-op

}

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

  // generate code to handle arguments

  iterate(fingerprint);

  // return result handler

  AddressLiteral result_handler(Interpreter::result_handler(method()->result_type()));

  __ sethi(result_handler, Lscratch);

  __ retl();

  __ delayed()->add(Lscratch, result_handler.low10(), Lscratch);

  __ flush();

}

// Implementation of SignatureHandlerLibrary

void SignatureHandlerLibrary::pd_set_handler(address handler) {}

class SlowSignatureHandler: public NativeSignatureIterator {

 private:

  address   _from;

  intptr_t* _to;

  intptr_t* _RegArgSignature;                   // Signature of first Arguments to be passed in Registers

  uint      _argcount;

  enum {                                        // We need to differenciate float from non floats in reg args

    non_float  = 0,

    float_sig  = 1,

    double_sig = 2,

    long_sig   = 3

  };

  virtual void pass_int() {

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

    _from -= Interpreter::stackElementSize;

    add_signature( non_float );

  }

  virtual void pass_object() {

    // pass address of from

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

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

    _from -= Interpreter::stackElementSize;

    add_signature( non_float );

   }

  virtual void pass_float()  {

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

    _from -= Interpreter::stackElementSize;

    add_signature( float_sig );

   }

  virtual void pass_double() {

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

    _from -= 2*Interpreter::stackElementSize;

   add_signature( double_sig );

   }

  virtual void pass_long() {

    _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));

    _to += 1;

    _from -= 2*Interpreter::stackElementSize;

    add_signature( long_sig );

  }

  virtual void add_signature( intptr_t sig_type ) {

    if ( _argcount < (sizeof (intptr_t))*4 ) {

      *_RegArgSignature |= (sig_type << (_argcount*2) );

      _argcount++;

    }

  }

 public:

  SlowSignatureHandler(const methodHandle& method, address from, intptr_t* to, intptr_t *RegArgSig) : NativeSignatureIterator(method) {

    _from = from;

    _to   = to;

    _RegArgSignature = RegArgSig;

    *_RegArgSignature = 0;

    _argcount = method->is_static() ? 2 : 1;

  }

};

IRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(

                                                    JavaThread* thread,

                                                    Method* method,

                                                    intptr_t* from,

                                                    intptr_t* to ))

  methodHandle m(thread, method);

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

  // handle arguments

  // Warning: We use reg arg slot 00 temporarily to return the RegArgSignature

  // back to the code that pops the arguments into the CPU registers

  SlowSignatureHandler(m, (address)from, m->is_static() ? to+2 : to+1, to).iterate((uint64_t)CONST64(-1));

  // return result handler

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

IRT_END