/*

 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

 * Copyright 2012, 2013 SAP AG. 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/assembler.inline.hpp"

#include "assembler_ppc.inline.hpp"

#include "code/relocInfo.hpp"

#include "nativeInst_ppc.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/safepoint.hpp"

void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) {

  bool copy_back_to_oop_pool = true;  // TODO: PPC port

  // The following comment is from the declaration of DataRelocation:

  //

  //  "The "o" (displacement) argument is relevant only to split relocations

  //   on RISC machines.  In some CPUs (SPARC), the set-hi and set-lo ins'ns

  //   can encode more than 32 bits between them.  This allows compilers to

  //   share set-hi instructions between addresses that differ by a small

  //   offset (e.g., different static variables in the same class).

  //   On such machines, the "x" argument to set_value on all set-lo

  //   instructions must be the same as the "x" argument for the

  //   corresponding set-hi instructions.  The "o" arguments for the

  //   set-hi instructions are ignored, and must not affect the high-half

  //   immediate constant.  The "o" arguments for the set-lo instructions are

  //   added into the low-half immediate constant, and must not overflow it."

  //

  // Currently we don't support splitting of relocations, so o must be

  // zero:

  assert(o == 0, "tried to split relocations");

  if (!verify_only) {

    if (format() != 1) {

      nativeMovConstReg_at(addr())->set_data_plain(((intptr_t)x), code());

    } else {

      assert(type() == relocInfo::oop_type || type() == relocInfo::metadata_type,

             "how to encode else?");

      narrowOop no = (type() == relocInfo::oop_type) ?

        oopDesc::encode_heap_oop((oop)x) : oopDesc::encode_klass((Klass*)x);

      nativeMovConstReg_at(addr())->set_narrow_oop(no, code());

    }

  } else {

    assert((address) (nativeMovConstReg_at(addr())->data()) == x, "data must match");

  }

}

address Relocation::pd_call_destination(address orig_addr) {

  intptr_t adj = 0;

  address inst_loc = addr();

  if (orig_addr != NULL) {

    // We just moved this call instruction from orig_addr to addr().

    // This means its target will appear to have grown by addr() - orig_addr.

    adj = -(inst_loc - orig_addr);

  }

  if (NativeFarCall::is_far_call_at(inst_loc)) {

    NativeFarCall* call = nativeFarCall_at(inst_loc);

    return call->destination() + (intptr_t)(call->is_pcrelative() ? adj : 0);

  } else if (NativeJump::is_jump_at(inst_loc)) {

    NativeJump* jump = nativeJump_at(inst_loc);

    return jump->jump_destination() + (intptr_t)(jump->is_pcrelative() ? adj : 0);

  } else if (NativeConditionalFarBranch::is_conditional_far_branch_at(inst_loc)) {

    NativeConditionalFarBranch* branch = NativeConditionalFarBranch_at(inst_loc);

    return branch->branch_destination();

  } else {

    // There are two instructions at the beginning of a stub, therefore we

    // load at orig_addr + 8.

    orig_addr = nativeCall_at(inst_loc)->get_trampoline();

    if (orig_addr == NULL) {

      return (address) -1;

    } else {

      return (address) nativeMovConstReg_at(orig_addr + 8)->data();

    }

  }

}

void Relocation::pd_set_call_destination(address x) {

  address inst_loc = addr();

  if (NativeFarCall::is_far_call_at(inst_loc)) {

    NativeFarCall* call = nativeFarCall_at(inst_loc);

    call->set_destination(x);

  } else if (NativeJump::is_jump_at(inst_loc)) {

    NativeJump* jump= nativeJump_at(inst_loc);

    jump->set_jump_destination(x);

  } else if (NativeConditionalFarBranch::is_conditional_far_branch_at(inst_loc)) {

    NativeConditionalFarBranch* branch = NativeConditionalFarBranch_at(inst_loc);

    branch->set_branch_destination(x);

  } else {

    NativeCall* call = nativeCall_at(inst_loc);

    call->set_destination_mt_safe(x, false);

  }

}

address* Relocation::pd_address_in_code() {

  ShouldNotReachHere();

  return 0;

}

address Relocation::pd_get_address_from_code() {

  return (address)(nativeMovConstReg_at(addr())->data());

}

void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {

}

void poll_return_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {

}

void metadata_Relocation::pd_fix_value(address x) {

}