/*

 * Copyright (c) 1999, 2010, 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 "runtime/sharedRuntime.hpp"

#include "vmreg_x86.inline.hpp"

const int FrameMap::pd_c_runtime_reserved_arg_size = 0;

LIR_Opr FrameMap::map_to_opr(BasicType type, VMRegPair* reg, bool) {

  LIR_Opr opr = LIR_OprFact::illegalOpr;

  VMReg r_1 = reg->first();

  VMReg r_2 = reg->second();

  if (r_1->is_stack()) {

    // Convert stack slot to an SP offset

    // The calling convention does not count the SharedRuntime::out_preserve_stack_slots() value

    // so we must add it in here.

    int st_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;

    opr = LIR_OprFact::address(new LIR_Address(rsp_opr, st_off, type));

  } else if (r_1->is_Register()) {

    Register reg = r_1->as_Register();

    if (r_2->is_Register() && (type == T_LONG || type == T_DOUBLE)) {

      Register reg2 = r_2->as_Register();

#ifdef _LP64

      assert(reg2 == reg, "must be same register");

      opr = as_long_opr(reg);

#else

      opr = as_long_opr(reg2, reg);

#endif // _LP64

    } else if (type == T_OBJECT || type == T_ARRAY) {

      opr = as_oop_opr(reg);

    } else {

      opr = as_opr(reg);

    }

  } else if (r_1->is_FloatRegister()) {

    assert(type == T_DOUBLE || type == T_FLOAT, "wrong type");

    int num = r_1->as_FloatRegister()->encoding();

    if (type == T_FLOAT) {

      opr = LIR_OprFact::single_fpu(num);

    } else {

      opr = LIR_OprFact::double_fpu(num);

    }

  } else if (r_1->is_XMMRegister()) {

    assert(type == T_DOUBLE || type == T_FLOAT, "wrong type");

    int num = r_1->as_XMMRegister()->encoding();

    if (type == T_FLOAT) {

      opr = LIR_OprFact::single_xmm(num);

    } else {

      opr = LIR_OprFact::double_xmm(num);

    }

  } else {

    ShouldNotReachHere();

  }

  return opr;

}

LIR_Opr FrameMap::rsi_opr;

LIR_Opr FrameMap::rdi_opr;

LIR_Opr FrameMap::rbx_opr;

LIR_Opr FrameMap::rax_opr;

LIR_Opr FrameMap::rdx_opr;

LIR_Opr FrameMap::rcx_opr;

LIR_Opr FrameMap::rsp_opr;

LIR_Opr FrameMap::rbp_opr;

LIR_Opr FrameMap::receiver_opr;

LIR_Opr FrameMap::rsi_oop_opr;

LIR_Opr FrameMap::rdi_oop_opr;

LIR_Opr FrameMap::rbx_oop_opr;

LIR_Opr FrameMap::rax_oop_opr;

LIR_Opr FrameMap::rdx_oop_opr;

LIR_Opr FrameMap::rcx_oop_opr;

LIR_Opr FrameMap::long0_opr;

LIR_Opr FrameMap::long1_opr;

LIR_Opr FrameMap::fpu0_float_opr;

LIR_Opr FrameMap::fpu0_double_opr;

LIR_Opr FrameMap::xmm0_float_opr;

LIR_Opr FrameMap::xmm0_double_opr;

#ifdef _LP64

LIR_Opr  FrameMap::r8_opr;

LIR_Opr  FrameMap::r9_opr;

LIR_Opr FrameMap::r10_opr;

LIR_Opr FrameMap::r11_opr;

LIR_Opr FrameMap::r12_opr;

LIR_Opr FrameMap::r13_opr;

LIR_Opr FrameMap::r14_opr;

LIR_Opr FrameMap::r15_opr;

// r10 and r15 can never contain oops since they aren't available to

// the allocator

LIR_Opr  FrameMap::r8_oop_opr;

LIR_Opr  FrameMap::r9_oop_opr;

LIR_Opr FrameMap::r11_oop_opr;

LIR_Opr FrameMap::r12_oop_opr;

LIR_Opr FrameMap::r13_oop_opr;

LIR_Opr FrameMap::r14_oop_opr;

#endif // _LP64

LIR_Opr FrameMap::_caller_save_cpu_regs[] = { 0, };

LIR_Opr FrameMap::_caller_save_fpu_regs[] = { 0, };

LIR_Opr FrameMap::_caller_save_xmm_regs[] = { 0, };

XMMRegister FrameMap::_xmm_regs [] = { 0, };

XMMRegister FrameMap::nr2xmmreg(int rnr) {

  assert(_init_done, "tables not initialized");

  return _xmm_regs[rnr];

}

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

//               FrameMap

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

void FrameMap::initialize() {

  assert(!_init_done, "once");

  assert(nof_cpu_regs == LP64_ONLY(16) NOT_LP64(8), "wrong number of CPU registers");

  map_register(0, rsi);  rsi_opr = LIR_OprFact::single_cpu(0);

  map_register(1, rdi);  rdi_opr = LIR_OprFact::single_cpu(1);

  map_register(2, rbx);  rbx_opr = LIR_OprFact::single_cpu(2);

  map_register(3, rax);  rax_opr = LIR_OprFact::single_cpu(3);

  map_register(4, rdx);  rdx_opr = LIR_OprFact::single_cpu(4);

  map_register(5, rcx);  rcx_opr = LIR_OprFact::single_cpu(5);

#ifndef _LP64

  // The unallocatable registers are at the end

  map_register(6, rsp);

  map_register(7, rbp);

#else

  map_register( 6, r8);    r8_opr = LIR_OprFact::single_cpu(6);

  map_register( 7, r9);    r9_opr = LIR_OprFact::single_cpu(7);

  map_register( 8, r11);  r11_opr = LIR_OprFact::single_cpu(8);

  map_register( 9, r13);  r13_opr = LIR_OprFact::single_cpu(9);

  map_register(10, r14);  r14_opr = LIR_OprFact::single_cpu(10);

  // r12 is allocated conditionally. With compressed oops it holds

  // the heapbase value and is not visible to the allocator.

  map_register(11, r12);  r12_opr = LIR_OprFact::single_cpu(11);

  // The unallocatable registers are at the end

  map_register(12, r10);  r10_opr = LIR_OprFact::single_cpu(12);

  map_register(13, r15);  r15_opr = LIR_OprFact::single_cpu(13);

  map_register(14, rsp);

  map_register(15, rbp);

#endif // _LP64

#ifdef _LP64

  long0_opr = LIR_OprFact::double_cpu(3 /*eax*/, 3 /*eax*/);

  long1_opr = LIR_OprFact::double_cpu(2 /*ebx*/, 2 /*ebx*/);

#else

  long0_opr = LIR_OprFact::double_cpu(3 /*eax*/, 4 /*edx*/);

  long1_opr = LIR_OprFact::double_cpu(2 /*ebx*/, 5 /*ecx*/);

#endif // _LP64

  fpu0_float_opr   = LIR_OprFact::single_fpu(0);

  fpu0_double_opr  = LIR_OprFact::double_fpu(0);

  xmm0_float_opr   = LIR_OprFact::single_xmm(0);

  xmm0_double_opr  = LIR_OprFact::double_xmm(0);

  _caller_save_cpu_regs[0] = rsi_opr;

  _caller_save_cpu_regs[1] = rdi_opr;

  _caller_save_cpu_regs[2] = rbx_opr;

  _caller_save_cpu_regs[3] = rax_opr;

  _caller_save_cpu_regs[4] = rdx_opr;

  _caller_save_cpu_regs[5] = rcx_opr;

#ifdef _LP64

  _caller_save_cpu_regs[6]  = r8_opr;

  _caller_save_cpu_regs[7]  = r9_opr;

  _caller_save_cpu_regs[8]  = r11_opr;

  _caller_save_cpu_regs[9]  = r13_opr;

  _caller_save_cpu_regs[10] = r14_opr;

  _caller_save_cpu_regs[11] = r12_opr;

#endif // _LP64

  _xmm_regs[0] = xmm0;

  _xmm_regs[1] = xmm1;

  _xmm_regs[2] = xmm2;

  _xmm_regs[3] = xmm3;

  _xmm_regs[4] = xmm4;

  _xmm_regs[5] = xmm5;

  _xmm_regs[6] = xmm6;

  _xmm_regs[7] = xmm7;

#ifdef _LP64

  _xmm_regs[8]   = xmm8;

  _xmm_regs[9]   = xmm9;

  _xmm_regs[10]  = xmm10;

  _xmm_regs[11]  = xmm11;

  _xmm_regs[12]  = xmm12;

  _xmm_regs[13]  = xmm13;

  _xmm_regs[14]  = xmm14;

  _xmm_regs[15]  = xmm15;

#endif // _LP64

  for (int i = 0; i < 8; i++) {

    _caller_save_fpu_regs[i] = LIR_OprFact::single_fpu(i);

  }

  for (int i = 0; i < nof_caller_save_xmm_regs ; i++) {

    _caller_save_xmm_regs[i] = LIR_OprFact::single_xmm(i);

  }

  _init_done = true;

  rsi_oop_opr = as_oop_opr(rsi);

  rdi_oop_opr = as_oop_opr(rdi);

  rbx_oop_opr = as_oop_opr(rbx);

  rax_oop_opr = as_oop_opr(rax);

  rdx_oop_opr = as_oop_opr(rdx);

  rcx_oop_opr = as_oop_opr(rcx);

  rsp_opr = as_pointer_opr(rsp);

  rbp_opr = as_pointer_opr(rbp);

#ifdef _LP64

  r8_oop_opr = as_oop_opr(r8);

  r9_oop_opr = as_oop_opr(r9);

  r11_oop_opr = as_oop_opr(r11);

  r12_oop_opr = as_oop_opr(r12);

  r13_oop_opr = as_oop_opr(r13);

  r14_oop_opr = as_oop_opr(r14);

#endif // _LP64

  VMRegPair regs;

  BasicType sig_bt = T_OBJECT;

  SharedRuntime::java_calling_convention(&sig_bt, &regs, 1, true);

  receiver_opr = as_oop_opr(regs.first()->as_Register());

}

Address FrameMap::make_new_address(ByteSize sp_offset) const {

  // for rbp, based address use this:

  // return Address(rbp, in_bytes(sp_offset) - (framesize() - 2) * 4);

  return Address(rsp, in_bytes(sp_offset));

}

// ----------------mapping-----------------------

// all mapping is based on rbp, addressing, except for simple leaf methods where we access

// the locals rsp based (and no frame is built)

// Frame for simple leaf methods (quick entries)

//

//   +----------+

//   | ret addr |   <- TOS

//   +----------+

//   | args     |

//   | ......   |

// Frame for standard methods

//

//   | .........|  <- TOS

//   | locals   |

//   +----------+

//   | old rbp,  |  <- EBP

//   +----------+

//   | ret addr |

//   +----------+

//   |  args    |

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

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

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

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

//

//           framesize +

//           stack0         stack0          0  <- VMReg

//             |              | <registers> |

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

//      0 1 2 3 x x 4 5 6 ... |                <- local indices

//      ^           ^        sp()                 ( x x indicate link

//      |           |                               and return addr)

//  arguments   non-argument locals

VMReg FrameMap::fpu_regname (int n) {

  // Return the OptoReg name for the fpu stack slot "n"

  // A spilled fpu stack slot comprises to two single-word OptoReg's.

  return as_FloatRegister(n)->as_VMReg();

}

LIR_Opr FrameMap::stack_pointer() {

  return FrameMap::rsp_opr;

}

// JSR 292

LIR_Opr FrameMap::method_handle_invoke_SP_save_opr() {

  assert(rbp == rbp_mh_SP_save, "must be same register");

  return rbp_opr;

}

bool FrameMap::validate_frame() {

  return true;

}