/*

 * Copyright (c) 2008, 2019, 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 "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->

InterpreterRuntime::SignatureHandlerGenerator::SignatureHandlerGenerator(

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

  _masm = new MacroAssembler(buffer);

  _abi_offset = 0;

  _ireg = is_static() ? 2 : 1;

#ifdef __ABI_HARD__

  _fp_slot = 0;

  _single_fpr_slot = 0;

#endif

}

#ifdef SHARING_FAST_NATIVE_FINGERPRINTS

// mapping from SignatureIterator param to (common) type of parsing

static const u1 shared_type[] = {

  (u1) SignatureIterator::int_parm, // bool

  (u1) SignatureIterator::int_parm, // byte

  (u1) SignatureIterator::int_parm, // char

  (u1) SignatureIterator::int_parm, // short

  (u1) SignatureIterator::int_parm, // int

  (u1) SignatureIterator::long_parm, // long

#ifndef __ABI_HARD__

  (u1) SignatureIterator::int_parm, // float, passed as int

  (u1) SignatureIterator::long_parm, // double, passed as long

#else

  (u1) SignatureIterator::float_parm, // float

  (u1) SignatureIterator::double_parm, // double

#endif

  (u1) SignatureIterator::obj_parm, // obj

  (u1) SignatureIterator::done_parm // done

};

uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {

  if (fingerprint == UCONST64(-1)) {

    // special signature used when the argument list cannot be encoded in a 64 bits value

    return fingerprint;

  }

  int shift = SignatureIterator::static_feature_size;

  uint64_t result = fingerprint & ((1 << shift) - 1);

  fingerprint >>= shift;

  BasicType ret_type = (BasicType) (fingerprint & SignatureIterator::result_feature_mask);

  // For ARM, the fast signature handler only needs to know whether

  // the return value must be unboxed. T_OBJECT and T_ARRAY need not

  // be distinguished from each other and all other return values

  // behave like integers with respect to the handler except T_BOOLEAN

  // which must be mapped to the range 0..1.

  bool unbox = (ret_type == T_OBJECT) || (ret_type == T_ARRAY);

  if (unbox) {

    ret_type = T_OBJECT;

  } else if (ret_type != T_BOOLEAN) {

    ret_type = T_INT;

  }

  result |= ((uint64_t) ret_type) << shift;

  shift += SignatureIterator::result_feature_size;

  fingerprint >>= SignatureIterator::result_feature_size;

  while (true) {

    uint32_t type = (uint32_t) (fingerprint & SignatureIterator::parameter_feature_mask);

    if (type == SignatureIterator::done_parm) {

      result |= ((uint64_t) SignatureIterator::done_parm) << shift;

      return result;

    }

    assert((type >= SignatureIterator::bool_parm) && (type <= SignatureIterator::obj_parm), "check fingerprint encoding");

    int shared = shared_type[type - SignatureIterator::bool_parm];

    result |= ((uint64_t) shared) << shift;

    shift += SignatureIterator::parameter_feature_size;

    fingerprint >>= SignatureIterator::parameter_feature_size;

  }

}

#endif // SHARING_FAST_NATIVE_FINGERPRINTS

// Implementation of SignatureHandlerGenerator

void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {

  if (_ireg < GPR_PARAMS) {

    Register dst = as_Register(_ireg);

    __ ldr_s32(dst, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    _ireg++;

  } else {

    __ ldr_s32(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    __ str_32(Rtemp, Address(SP, _abi_offset * wordSize));

    _abi_offset++;

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {

  if (_ireg <= 2) {

#if (ALIGN_WIDE_ARGUMENTS == 1)

    if ((_ireg & 1) != 0) {

      // 64-bit values should be 8-byte aligned

      _ireg++;

    }

#endif

    Register dst1 = as_Register(_ireg);

    Register dst2 = as_Register(_ireg+1);

    __ ldr(dst1, Address(Rlocals, Interpreter::local_offset_in_bytes(offset()+1)));

    __ ldr(dst2, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    _ireg += 2;

#if (ALIGN_WIDE_ARGUMENTS == 0)

  } else if (_ireg == 3) {

    // uses R3 + one stack slot

    Register dst1 = as_Register(_ireg);

    __ ldr(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    __ ldr(dst1, Address(Rlocals, Interpreter::local_offset_in_bytes(offset()+1)));

    __ str(Rtemp, Address(SP, _abi_offset * wordSize));

    _ireg += 1;

    _abi_offset += 1;

#endif

  } else {

#if (ALIGN_WIDE_ARGUMENTS == 1)

    if(_abi_offset & 1) _abi_offset++;

#endif

    __ ldr(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset()+1)));

    __ str(Rtemp, Address(SP, (_abi_offset) * wordSize));

    __ ldr(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    __ str(Rtemp, Address(SP, (_abi_offset+1) * wordSize));

    _abi_offset += 2;

    _ireg = 4;

  }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {

  if (_ireg < 4) {

    Register dst = as_Register(_ireg);

    __ ldr(dst, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    __ cmp(dst, 0);

    __ sub(dst, Rlocals, -Interpreter::local_offset_in_bytes(offset()), ne);

    _ireg++;

  } else {

    __ ldr(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    __ cmp(Rtemp, 0);

    __ sub(Rtemp, Rlocals, -Interpreter::local_offset_in_bytes(offset()), ne);

    __ str(Rtemp, Address(SP, _abi_offset * wordSize));

    _abi_offset++;

  }

}

#ifndef __ABI_HARD__

void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {

  if (_ireg < 4) {

    Register dst = as_Register(_ireg);

    __ ldr(dst, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    _ireg++;

  } else {

    __ ldr(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

    __ str(Rtemp, Address(SP, _abi_offset * wordSize));

    _abi_offset++;

  }

}

#else

#ifndef __SOFTFP__

void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {

    if((_fp_slot < 16) || (_single_fpr_slot & 1)) {

      if ((_single_fpr_slot & 1) == 0) {

        _single_fpr_slot = _fp_slot;

        _fp_slot += 2;

      }

      __ flds(as_FloatRegister(_single_fpr_slot), Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

      _single_fpr_slot++;

    } else {

      __ ldr(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

      __ str(Rtemp, Address(SP, _abi_offset * wordSize));

      _abi_offset++;

    }

}

void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {

    if(_fp_slot <= 14) {

      __ fldd(as_FloatRegister(_fp_slot), Address(Rlocals, Interpreter::local_offset_in_bytes(offset()+1)));

      _fp_slot += 2;

    } else {

      __ ldr(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset()+1)));

      __ str(Rtemp, Address(SP, (_abi_offset) * wordSize));

      __ ldr(Rtemp, Address(Rlocals, Interpreter::local_offset_in_bytes(offset())));

      __ str(Rtemp, Address(SP, (_abi_offset+1) * wordSize));

      _abi_offset += 2;

      _single_fpr_slot = 16;

    }

}

#endif // __SOFTFP__

#endif // __ABI_HARD__

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

  iterate(fingerprint);

  BasicType result_type = SignatureIterator::return_type(fingerprint);

  address result_handler = Interpreter::result_handler(result_type);

  __ mov_slow(R0, (intptr_t)result_handler);

  __ ret();

}

// Implementation of SignatureHandlerLibrary

void SignatureHandlerLibrary::pd_set_handler(address handler) {}

class SlowSignatureHandler: public NativeSignatureIterator {

 private:

  address   _from;

  intptr_t* _to;

#ifndef __ABI_HARD__

  virtual void pass_int() {

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

    _from -= Interpreter::stackElementSize;

  }

  virtual void pass_float() {

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

    _from -= Interpreter::stackElementSize;

  }

  virtual void pass_long() {

#if (ALIGN_WIDE_ARGUMENTS == 1)

    if (((intptr_t)_to & 7) != 0) {

      // 64-bit values should be 8-byte aligned

      _to++;

    }

#endif

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

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

    _to += 2;

    _from -= 2*Interpreter::stackElementSize;

  }

  virtual void pass_object() {

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

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

    _from -= Interpreter::stackElementSize;

   }

#else

  intptr_t* _toFP;

  intptr_t* _toGP;

  int       _last_gp;

  int       _last_fp;

  int       _last_single_fp;

  virtual void pass_int() {

    if(_last_gp < GPR_PARAMS) {

      _toGP[_last_gp++] = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));

    } else {

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

    }

    _from -= Interpreter::stackElementSize;

  }

  virtual void pass_long() {

    assert(ALIGN_WIDE_ARGUMENTS == 1, "ABI_HARD not supported with unaligned wide arguments");

    if (_last_gp <= 2) {

      if(_last_gp & 1) _last_gp++;

      _toGP[_last_gp++] = *(jint *)(_from+Interpreter::local_offset_in_bytes(1));

      _toGP[_last_gp++] = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));

    } else {

      if (((intptr_t)_to & 7) != 0) {

        // 64-bit values should be 8-byte aligned

        _to++;

      }

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

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

      _to += 2;

      _last_gp = 4;

    }

    _from -= 2*Interpreter::stackElementSize;

  }

  virtual void pass_object() {

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

    if(_last_gp < GPR_PARAMS) {

      _toGP[_last_gp++] = (*(intptr_t*)from_addr == 0) ? NULL : from_addr;

    } else {

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

    }

    _from -= Interpreter::stackElementSize;

  }

  virtual void pass_float() {

    if((_last_fp < 16) || (_last_single_fp & 1)) {

      if ((_last_single_fp & 1) == 0) {

        _last_single_fp = _last_fp;

        _last_fp += 2;

      }

      _toFP[_last_single_fp++] = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));

    } else {

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

    }

    _from -= Interpreter::stackElementSize;

  }

  virtual void pass_double() {

    assert(ALIGN_WIDE_ARGUMENTS == 1, "ABI_HARD not supported with unaligned wide arguments");

    if(_last_fp <= 14) {

      _toFP[_last_fp++] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));

      _toFP[_last_fp++] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));

    } else {

      if (((intptr_t)_to & 7) != 0) {      // 64-bit values should be 8-byte aligned

        _to++;

      }

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

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

      _to += 2;

      _last_single_fp = 16;

    }

    _from -= 2*Interpreter::stackElementSize;

  }

#endif // !__ABI_HARD__

 public:

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

    NativeSignatureIterator(method) {

    _from = from;

#ifdef __ABI_HARD__

    _toGP  = to;

    _toFP = _toGP + GPR_PARAMS;

    _to   = _toFP + (8*2);

    _last_gp = (is_static() ? 2 : 1);

    _last_fp = 0;

    _last_single_fp = 0;

#else

    _to   = to + (is_static() ? 2 : 1);

#endif // __ABI_HARD__

  }

};

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");

  SlowSignatureHandler(m, (address)from, to).iterate(UCONST64(-1));

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

JRT_END