/*

 * Copyright (c) 2000, 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 "c1/c1_FrameMap.hpp"

#include "c1/c1_LIR.hpp"

#include "code/vmreg.inline.hpp"

#include "runtime/sharedRuntime.hpp"

//-----------------------------------------------------

// Convert method signature into an array of BasicTypes for the arguments

BasicTypeArray* FrameMap::signature_type_array_for(const ciMethod* method) {

  ciSignature* sig = method->signature();

  BasicTypeList* sta = new BasicTypeList(method->arg_size());

  // add receiver, if any

  if (!method->is_static()) sta->append(T_OBJECT);

  // add remaining arguments

  for (int i = 0; i < sig->count(); i++) {

    ciType* type = sig->type_at(i);

    BasicType t = type->basic_type();

    if (t == T_ARRAY) {

      t = T_OBJECT;

    }

    sta->append(t);

  }

  // done

  return sta;

}

CallingConvention* FrameMap::java_calling_convention(const BasicTypeArray* signature, bool outgoing) {

  // compute the size of the arguments first.  The signature array

  // that java_calling_convention takes includes a T_VOID after double

  // work items but our signatures do not.

  int i;

  int sizeargs = 0;

  for (i = 0; i < signature->length(); i++) {

    sizeargs += type2size[signature->at(i)];

  }

  BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);

  VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);

  int sig_index = 0;

  for (i = 0; i < sizeargs; i++, sig_index++) {

    sig_bt[i] = signature->at(sig_index);

    if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {

      sig_bt[i + 1] = T_VOID;

      i++;

    }

  }

  intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, outgoing);

  LIR_OprList* args = new LIR_OprList(signature->length());

  for (i = 0; i < sizeargs;) {

    BasicType t = sig_bt[i];

    assert(t != T_VOID, "should be skipping these");

    LIR_Opr opr = map_to_opr(t, regs + i, outgoing);

    args->append(opr);

    if (opr->is_address()) {

      LIR_Address* addr = opr->as_address_ptr();

      assert(addr->disp() == (int)addr->disp(), "out of range value");

      out_preserve = MAX2(out_preserve, (intptr_t)(addr->disp() - STACK_BIAS) / 4);

    }

    i += type2size[t];

  }

  assert(args->length() == signature->length(), "size mismatch");

  out_preserve += SharedRuntime::out_preserve_stack_slots();

  if (outgoing) {

    // update the space reserved for arguments.

    update_reserved_argument_area_size(out_preserve * BytesPerWord);

  }

  return new CallingConvention(args, out_preserve);

}

CallingConvention* FrameMap::c_calling_convention(const BasicTypeArray* signature) {

  // compute the size of the arguments first.  The signature array

  // that java_calling_convention takes includes a T_VOID after double

  // work items but our signatures do not.

  int i;

  int sizeargs = 0;

  for (i = 0; i < signature->length(); i++) {

    sizeargs += type2size[signature->at(i)];

  }

  BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);

  VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);

  int sig_index = 0;

  for (i = 0; i < sizeargs; i++, sig_index++) {

    sig_bt[i] = signature->at(sig_index);

    if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {

      sig_bt[i + 1] = T_VOID;

      i++;

    }

  }

  intptr_t out_preserve = SharedRuntime::c_calling_convention(sig_bt, regs, NULL, sizeargs);

  LIR_OprList* args = new LIR_OprList(signature->length());

  for (i = 0; i < sizeargs;) {

    BasicType t = sig_bt[i];

    assert(t != T_VOID, "should be skipping these");

    // C calls are always outgoing

    bool outgoing = true;

    LIR_Opr opr = map_to_opr(t, regs + i, outgoing);

    // they might be of different types if for instance floating point

    // values are passed in cpu registers, but the sizes must match.

    assert(type2size[opr->type()] == type2size[t], "type mismatch");

    args->append(opr);

    if (opr->is_address()) {

      LIR_Address* addr = opr->as_address_ptr();

      out_preserve = MAX2(out_preserve, (intptr_t)(addr->disp() - STACK_BIAS) / 4);

    }

    i += type2size[t];

  }

  assert(args->length() == signature->length(), "size mismatch");

  out_preserve += SharedRuntime::out_preserve_stack_slots();

  update_reserved_argument_area_size(out_preserve * BytesPerWord);

  return new CallingConvention(args, out_preserve);

}

//--------------------------------------------------------

//               FrameMap

//--------------------------------------------------------

bool      FrameMap::_init_done = false;

Register  FrameMap::_cpu_rnr2reg [FrameMap::nof_cpu_regs];

int       FrameMap::_cpu_reg2rnr [FrameMap::nof_cpu_regs];

FrameMap::FrameMap(ciMethod* method, int monitors, int reserved_argument_area_size) {

  assert(_init_done, "should already be completed");

  _framesize = -1;

  _num_spills = -1;

  assert(monitors >= 0, "not set");

  _num_monitors = monitors;

  assert(reserved_argument_area_size >= 0, "not set");

  _reserved_argument_area_size = MAX2(4, reserved_argument_area_size) * BytesPerWord;

  _argcount = method->arg_size();

  _argument_locations = new intArray(_argcount, _argcount, -1);

  _incoming_arguments = java_calling_convention(signature_type_array_for(method), false);

  _oop_map_arg_count = _incoming_arguments->reserved_stack_slots();

  int java_index = 0;

  for (int i = 0; i < _incoming_arguments->length(); i++) {

    LIR_Opr opr = _incoming_arguments->at(i);

    if (opr->is_address()) {

      LIR_Address* address = opr->as_address_ptr();

      _argument_locations->at_put(java_index, address->disp() - STACK_BIAS);

      _incoming_arguments->args()->at_put(i, LIR_OprFact::stack(java_index, as_BasicType(as_ValueType(address->type()))));

    }

    java_index += type2size[opr->type()];

  }

}

bool FrameMap::finalize_frame(int nof_slots) {

  assert(nof_slots >= 0, "must be positive");

  assert(_num_spills == -1, "can only be set once");

  _num_spills = nof_slots;

  assert(_framesize == -1, "should only be calculated once");

  _framesize =  round_to(in_bytes(sp_offset_for_monitor_base(0)) +

                         _num_monitors * sizeof(BasicObjectLock) +

                         sizeof(intptr_t) +                        // offset of deopt orig pc

                         frame_pad_in_bytes,

                         StackAlignmentInBytes) / 4;

  int java_index = 0;

  for (int i = 0; i < _incoming_arguments->length(); i++) {

    LIR_Opr opr = _incoming_arguments->at(i);

    if (opr->is_stack()) {

      _argument_locations->at_put(java_index, in_bytes(framesize_in_bytes()) +

                                  _argument_locations->at(java_index));

    }

    java_index += type2size[opr->type()];

  }

  // make sure it's expressible on the platform

  return validate_frame();

}

VMReg FrameMap::sp_offset2vmreg(ByteSize offset) const {

  int offset_in_bytes = in_bytes(offset);

  assert(offset_in_bytes % 4 == 0, "must be multiple of 4 bytes");

  assert(offset_in_bytes / 4 < framesize() + oop_map_arg_count(), "out of range");

  return VMRegImpl::stack2reg(offset_in_bytes / 4);

}

bool FrameMap::location_for_sp_offset(ByteSize byte_offset_from_sp,

                                      Location::Type loc_type,

                                      Location* loc) const {

  int offset = in_bytes(byte_offset_from_sp);

  assert(offset >= 0, "incorrect offset");

  if (!Location::legal_offset_in_bytes(offset)) {

    return false;

  }

  Location tmp_loc = Location::new_stk_loc(loc_type, offset);

  *loc = tmp_loc;

  return true;

}

bool FrameMap::locations_for_slot  (int index, Location::Type loc_type,

                                     Location* loc, Location* second) const {

  ByteSize offset_from_sp = sp_offset_for_slot(index);

  if (!location_for_sp_offset(offset_from_sp, loc_type, loc)) {

    return false;

  }

  if (second != NULL) {

    // two word item

    offset_from_sp = offset_from_sp + in_ByteSize(4);

    return location_for_sp_offset(offset_from_sp, loc_type, second);

  }

  return true;

}

//////////////////////

// Public accessors //

//////////////////////

ByteSize FrameMap::sp_offset_for_slot(const int index) const {

  if (index < argcount()) {

    int offset = _argument_locations->at(index);

    assert(offset != -1, "not a memory argument");

    assert(offset >= framesize() * 4, "argument inside of frame");

    return in_ByteSize(offset);

  }

  ByteSize offset = sp_offset_for_spill(index - argcount());

  assert(in_bytes(offset) < framesize() * 4, "spill outside of frame");

  return offset;

}

ByteSize FrameMap::sp_offset_for_double_slot(const int index) const {

  ByteSize offset = sp_offset_for_slot(index);

  if (index >= argcount()) {

    assert(in_bytes(offset) + 4 < framesize() * 4, "spill outside of frame");

  }

  return offset;

}

ByteSize FrameMap::sp_offset_for_spill(const int index) const {

  assert(index >= 0 && index < _num_spills, "out of range");

  int offset = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +

    index * spill_slot_size_in_bytes;

  return in_ByteSize(offset);

}

ByteSize FrameMap::sp_offset_for_monitor_base(const int index) const {

  int end_of_spills = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +

    _num_spills * spill_slot_size_in_bytes;

  int offset = (int) round_to(end_of_spills, HeapWordSize) + index * sizeof(BasicObjectLock);

  return in_ByteSize(offset);

}

ByteSize FrameMap::sp_offset_for_monitor_lock(int index) const {

  check_monitor_index(index);

  return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::lock_offset_in_bytes());;

}

ByteSize FrameMap::sp_offset_for_monitor_object(int index) const {

  check_monitor_index(index);

  return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::obj_offset_in_bytes());

}

// For OopMaps, map a local variable or spill index to an VMReg.

// This is the offset from sp() in the frame of the slot for the index,

// skewed by SharedInfo::stack0 to indicate a stack location (vs.a register.)

//

//         C ABI size +

//         framesize +     framesize +

//         stack0          stack0         stack0          0 <- VMReg->value()

//            |              |              | <registers> |

//  ..........|..............|..............|.............|

//    0 1 2 3 | <C ABI area> | 4 5 6 ...... |               <- local indices

//    ^                        ^          sp()

//    |                        |

//  arguments            non-argument locals

VMReg FrameMap::regname(LIR_Opr opr) const {

  if (opr->is_single_cpu()) {

    assert(!opr->is_virtual(), "should not see virtual registers here");

    return opr->as_register()->as_VMReg();

  } else if (opr->is_single_stack()) {

    return sp_offset2vmreg(sp_offset_for_slot(opr->single_stack_ix()));

  } else if (opr->is_address()) {

    LIR_Address* addr = opr->as_address_ptr();

    assert(addr->base() == stack_pointer(), "sp based addressing only");

    return sp_offset2vmreg(in_ByteSize(addr->index()->as_jint()));

  }

  ShouldNotReachHere();

  return VMRegImpl::Bad();

}

// ------------ extra spill slots ---------------