/*

 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2014, Red Hat Inc. 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

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 *

 */

#include "precompiled.hpp"

#include "asm/macroAssembler.hpp"

#include "asm/macroAssembler.inline.hpp"

#include "code/icBuffer.hpp"

#include "gc/shared/collectedHeap.inline.hpp"

#include "interpreter/bytecodes.hpp"

#include "memory/resourceArea.hpp"

#include "nativeInst_aarch64.hpp"

#include "oops/oop.inline.hpp"

int InlineCacheBuffer::ic_stub_code_size() {

  return (MacroAssembler::far_branches() ? 6 : 4) * NativeInstruction::instruction_size;

}

#define __ masm->

void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {

  ResourceMark rm;

  CodeBuffer      code(code_begin, ic_stub_code_size());

  MacroAssembler* masm            = new MacroAssembler(&code);

  // note: even though the code contains an embedded value, we do not need reloc info

  // because

  // (1) the value is old (i.e., doesn't matter for scavenges)

  // (2) these ICStubs are removed *before* a GC happens, so the roots disappear

  // assert(cached_value == NULL || cached_oop->is_perm(), "must be perm oop");

  address start = __ pc();

  Label l;

  __ ldr(rscratch2, l);

  __ far_jump(ExternalAddress(entry_point));

  __ align(wordSize);

  __ bind(l);

  __ emit_int64((int64_t)cached_value);

  // Only need to invalidate the 1st two instructions - not the whole ic stub

  ICache::invalidate_range(code_begin, InlineCacheBuffer::ic_stub_code_size());

  assert(__ pc() - start == ic_stub_code_size(), "must be");

}

address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {

  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object

  NativeJump* jump = nativeJump_at(code_begin + 4);

  return jump->jump_destination();

}

void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {

  // The word containing the cached value is at the end of this IC buffer

  uintptr_t *p = (uintptr_t *)(code_begin + ic_stub_code_size() - wordSize);

  void* o = (void*)*p;

  return o;

}